1 /*
2 * SSLv3/TLSv1 shared functions
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21 /*
22 * The SSL 3.0 specification was drafted by Netscape in 1996,
23 * and became an IETF standard in 1999.
24 *
25 * http://wp.netscape.com/eng/ssl3/
26 * http://www.ietf.org/rfc/rfc2246.txt
27 * http://www.ietf.org/rfc/rfc4346.txt
28 */
29
30 #if !defined(MBEDTLS_CONFIG_FILE)
31 #include "mbedtls/config.h"
32 #else
33 #include MBEDTLS_CONFIG_FILE
34 #endif
35
36 #if defined(MBEDTLS_SSL_TLS_C)
37
38 #if defined(MBEDTLS_PLATFORM_C)
39 #include "mbedtls/platform.h"
40 #else
41 #include <stdlib.h>
42 #define mbedtls_calloc calloc
43 #define mbedtls_free free
44 #endif
45
46 #include "mbedtls/debug.h"
47 #include "mbedtls/ssl.h"
48 #include "mbedtls/ssl_internal.h"
49
50 #include <string.h>
51
52 #if defined(MBEDTLS_X509_CRT_PARSE_C)
53 #include "mbedtls/oid.h"
54 #endif
55
56 /* Implementation that should never be optimized out by the compiler */
mbedtls_zeroize(void * v,size_t n)57 static void mbedtls_zeroize( void *v, size_t n ) {
58 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
59 }
60
61 /* Length of the "epoch" field in the record header */
ssl_ep_len(const mbedtls_ssl_context * ssl)62 static inline size_t ssl_ep_len( const mbedtls_ssl_context *ssl )
63 {
64 #if defined(MBEDTLS_SSL_PROTO_DTLS)
65 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
66 return( 2 );
67 #else
68 ((void) ssl);
69 #endif
70 return( 0 );
71 }
72
73 /*
74 * Start a timer.
75 * Passing millisecs = 0 cancels a running timer.
76 */
ssl_set_timer(mbedtls_ssl_context * ssl,uint32_t millisecs)77 static void ssl_set_timer( mbedtls_ssl_context *ssl, uint32_t millisecs )
78 {
79 if( ssl->f_set_timer == NULL )
80 return;
81
82 MBEDTLS_SSL_DEBUG_MSG( 3, ( "set_timer to %d ms", (int) millisecs ) );
83 ssl->f_set_timer( ssl->p_timer, millisecs / 4, millisecs );
84 }
85
86 /*
87 * Return -1 is timer is expired, 0 if it isn't.
88 */
ssl_check_timer(mbedtls_ssl_context * ssl)89 static int ssl_check_timer( mbedtls_ssl_context *ssl )
90 {
91 if( ssl->f_get_timer == NULL )
92 return( 0 );
93
94 if( ssl->f_get_timer( ssl->p_timer ) == 2 )
95 {
96 MBEDTLS_SSL_DEBUG_MSG( 3, ( "timer expired" ) );
97 return( -1 );
98 }
99
100 return( 0 );
101 }
102
103 #if defined(MBEDTLS_SSL_PROTO_DTLS)
104 /*
105 * Double the retransmit timeout value, within the allowed range,
106 * returning -1 if the maximum value has already been reached.
107 */
ssl_double_retransmit_timeout(mbedtls_ssl_context * ssl)108 static int ssl_double_retransmit_timeout( mbedtls_ssl_context *ssl )
109 {
110 uint32_t new_timeout;
111
112 if( ssl->handshake->retransmit_timeout >= ssl->conf->hs_timeout_max )
113 return( -1 );
114
115 new_timeout = 2 * ssl->handshake->retransmit_timeout;
116
117 /* Avoid arithmetic overflow and range overflow */
118 if( new_timeout < ssl->handshake->retransmit_timeout ||
119 new_timeout > ssl->conf->hs_timeout_max )
120 {
121 new_timeout = ssl->conf->hs_timeout_max;
122 }
123
124 ssl->handshake->retransmit_timeout = new_timeout;
125 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
126 ssl->handshake->retransmit_timeout ) );
127
128 return( 0 );
129 }
130
ssl_reset_retransmit_timeout(mbedtls_ssl_context * ssl)131 static void ssl_reset_retransmit_timeout( mbedtls_ssl_context *ssl )
132 {
133 ssl->handshake->retransmit_timeout = ssl->conf->hs_timeout_min;
134 MBEDTLS_SSL_DEBUG_MSG( 3, ( "update timeout value to %d millisecs",
135 ssl->handshake->retransmit_timeout ) );
136 }
137 #endif /* MBEDTLS_SSL_PROTO_DTLS */
138
139 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
140 /*
141 * Convert max_fragment_length codes to length.
142 * RFC 6066 says:
143 * enum{
144 * 2^9(1), 2^10(2), 2^11(3), 2^12(4), (255)
145 * } MaxFragmentLength;
146 * and we add 0 -> extension unused
147 */
148 static unsigned int mfl_code_to_length[MBEDTLS_SSL_MAX_FRAG_LEN_INVALID] =
149 {
150 MBEDTLS_SSL_MAX_CONTENT_LEN, /* MBEDTLS_SSL_MAX_FRAG_LEN_NONE */
151 512, /* MBEDTLS_SSL_MAX_FRAG_LEN_512 */
152 1024, /* MBEDTLS_SSL_MAX_FRAG_LEN_1024 */
153 2048, /* MBEDTLS_SSL_MAX_FRAG_LEN_2048 */
154 4096, /* MBEDTLS_SSL_MAX_FRAG_LEN_4096 */
155 };
156 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
157
158 #if defined(MBEDTLS_SSL_CLI_C)
ssl_session_copy(mbedtls_ssl_session * dst,const mbedtls_ssl_session * src)159 static int ssl_session_copy( mbedtls_ssl_session *dst, const mbedtls_ssl_session *src )
160 {
161 mbedtls_ssl_session_free( dst );
162 memcpy( dst, src, sizeof( mbedtls_ssl_session ) );
163
164 #if defined(MBEDTLS_X509_CRT_PARSE_C)
165 if( src->peer_cert != NULL )
166 {
167 int ret;
168
169 dst->peer_cert = mbedtls_calloc( 1, sizeof(mbedtls_x509_crt) );
170 if( dst->peer_cert == NULL )
171 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
172
173 mbedtls_x509_crt_init( dst->peer_cert );
174
175 if( ( ret = mbedtls_x509_crt_parse_der( dst->peer_cert, src->peer_cert->raw.p,
176 src->peer_cert->raw.len ) ) != 0 )
177 {
178 mbedtls_free( dst->peer_cert );
179 dst->peer_cert = NULL;
180 return( ret );
181 }
182 }
183 #endif /* MBEDTLS_X509_CRT_PARSE_C */
184
185 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
186 if( src->ticket != NULL )
187 {
188 dst->ticket = mbedtls_calloc( 1, src->ticket_len );
189 if( dst->ticket == NULL )
190 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
191
192 memcpy( dst->ticket, src->ticket, src->ticket_len );
193 }
194 #endif /* MBEDTLS_SSL_SESSION_TICKETS && MBEDTLS_SSL_CLI_C */
195
196 return( 0 );
197 }
198 #endif /* MBEDTLS_SSL_CLI_C */
199
200 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
201 int (*mbedtls_ssl_hw_record_init)( mbedtls_ssl_context *ssl,
202 const unsigned char *key_enc, const unsigned char *key_dec,
203 size_t keylen,
204 const unsigned char *iv_enc, const unsigned char *iv_dec,
205 size_t ivlen,
206 const unsigned char *mac_enc, const unsigned char *mac_dec,
207 size_t maclen ) = NULL;
208 int (*mbedtls_ssl_hw_record_activate)( mbedtls_ssl_context *ssl, int direction) = NULL;
209 int (*mbedtls_ssl_hw_record_reset)( mbedtls_ssl_context *ssl ) = NULL;
210 int (*mbedtls_ssl_hw_record_write)( mbedtls_ssl_context *ssl ) = NULL;
211 int (*mbedtls_ssl_hw_record_read)( mbedtls_ssl_context *ssl ) = NULL;
212 int (*mbedtls_ssl_hw_record_finish)( mbedtls_ssl_context *ssl ) = NULL;
213 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
214
215 /*
216 * Key material generation
217 */
218 #if defined(MBEDTLS_SSL_PROTO_SSL3)
ssl3_prf(const unsigned char * secret,size_t slen,const char * label,const unsigned char * random,size_t rlen,unsigned char * dstbuf,size_t dlen)219 static int ssl3_prf( const unsigned char *secret, size_t slen,
220 const char *label,
221 const unsigned char *random, size_t rlen,
222 unsigned char *dstbuf, size_t dlen )
223 {
224 size_t i;
225 mbedtls_md5_context md5;
226 mbedtls_sha1_context sha1;
227 unsigned char padding[16];
228 unsigned char sha1sum[20];
229 ((void)label);
230
231 mbedtls_md5_init( &md5 );
232 mbedtls_sha1_init( &sha1 );
233
234 /*
235 * SSLv3:
236 * block =
237 * MD5( secret + SHA1( 'A' + secret + random ) ) +
238 * MD5( secret + SHA1( 'BB' + secret + random ) ) +
239 * MD5( secret + SHA1( 'CCC' + secret + random ) ) +
240 * ...
241 */
242 for( i = 0; i < dlen / 16; i++ )
243 {
244 memset( padding, (unsigned char) ('A' + i), 1 + i );
245
246 mbedtls_sha1_starts( &sha1 );
247 mbedtls_sha1_update( &sha1, padding, 1 + i );
248 mbedtls_sha1_update( &sha1, secret, slen );
249 mbedtls_sha1_update( &sha1, random, rlen );
250 mbedtls_sha1_finish( &sha1, sha1sum );
251
252 mbedtls_md5_starts( &md5 );
253 mbedtls_md5_update( &md5, secret, slen );
254 mbedtls_md5_update( &md5, sha1sum, 20 );
255 mbedtls_md5_finish( &md5, dstbuf + i * 16 );
256 }
257
258 mbedtls_md5_free( &md5 );
259 mbedtls_sha1_free( &sha1 );
260
261 mbedtls_zeroize( padding, sizeof( padding ) );
262 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
263
264 return( 0 );
265 }
266 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
267
268 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
tls1_prf(const unsigned char * secret,size_t slen,const char * label,const unsigned char * random,size_t rlen,unsigned char * dstbuf,size_t dlen)269 static int tls1_prf( const unsigned char *secret, size_t slen,
270 const char *label,
271 const unsigned char *random, size_t rlen,
272 unsigned char *dstbuf, size_t dlen )
273 {
274 size_t nb, hs;
275 size_t i, j, k;
276 const unsigned char *S1, *S2;
277 unsigned char tmp[128];
278 unsigned char h_i[20];
279 const mbedtls_md_info_t *md_info;
280 mbedtls_md_context_t md_ctx;
281 int ret;
282
283 mbedtls_md_init( &md_ctx );
284
285 if( sizeof( tmp ) < 20 + strlen( label ) + rlen )
286 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
287
288 hs = ( slen + 1 ) / 2;
289 S1 = secret;
290 S2 = secret + slen - hs;
291
292 nb = strlen( label );
293 memcpy( tmp + 20, label, nb );
294 memcpy( tmp + 20 + nb, random, rlen );
295 nb += rlen;
296
297 /*
298 * First compute P_md5(secret,label+random)[0..dlen]
299 */
300 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_MD5 ) ) == NULL )
301 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
302
303 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
304 return( ret );
305
306 mbedtls_md_hmac_starts( &md_ctx, S1, hs );
307 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
308 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
309
310 for( i = 0; i < dlen; i += 16 )
311 {
312 mbedtls_md_hmac_reset ( &md_ctx );
313 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 + nb );
314 mbedtls_md_hmac_finish( &md_ctx, h_i );
315
316 mbedtls_md_hmac_reset ( &md_ctx );
317 mbedtls_md_hmac_update( &md_ctx, 4 + tmp, 16 );
318 mbedtls_md_hmac_finish( &md_ctx, 4 + tmp );
319
320 k = ( i + 16 > dlen ) ? dlen % 16 : 16;
321
322 for( j = 0; j < k; j++ )
323 dstbuf[i + j] = h_i[j];
324 }
325
326 mbedtls_md_free( &md_ctx );
327
328 /*
329 * XOR out with P_sha1(secret,label+random)[0..dlen]
330 */
331 if( ( md_info = mbedtls_md_info_from_type( MBEDTLS_MD_SHA1 ) ) == NULL )
332 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
333
334 if( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
335 return( ret );
336
337 mbedtls_md_hmac_starts( &md_ctx, S2, hs );
338 mbedtls_md_hmac_update( &md_ctx, tmp + 20, nb );
339 mbedtls_md_hmac_finish( &md_ctx, tmp );
340
341 for( i = 0; i < dlen; i += 20 )
342 {
343 mbedtls_md_hmac_reset ( &md_ctx );
344 mbedtls_md_hmac_update( &md_ctx, tmp, 20 + nb );
345 mbedtls_md_hmac_finish( &md_ctx, h_i );
346
347 mbedtls_md_hmac_reset ( &md_ctx );
348 mbedtls_md_hmac_update( &md_ctx, tmp, 20 );
349 mbedtls_md_hmac_finish( &md_ctx, tmp );
350
351 k = ( i + 20 > dlen ) ? dlen % 20 : 20;
352
353 for( j = 0; j < k; j++ )
354 dstbuf[i + j] = (unsigned char)( dstbuf[i + j] ^ h_i[j] );
355 }
356
357 mbedtls_md_free( &md_ctx );
358
359 mbedtls_zeroize( tmp, sizeof( tmp ) );
360 mbedtls_zeroize( h_i, sizeof( h_i ) );
361
362 return( 0 );
363 }
364 #endif /* MBEDTLS_SSL_PROTO_TLS1) || MBEDTLS_SSL_PROTO_TLS1_1 */
365
366 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
tls_prf_generic(mbedtls_md_type_t md_type,const unsigned char * secret,size_t slen,const char * label,const unsigned char * random,size_t rlen,unsigned char * dstbuf,size_t dlen)367 static int tls_prf_generic( mbedtls_md_type_t md_type,
368 const unsigned char *secret, size_t slen,
369 const char *label,
370 const unsigned char *random, size_t rlen,
371 unsigned char *dstbuf, size_t dlen )
372 {
373 size_t nb;
374 size_t i, j, k, md_len;
375 unsigned char tmp[128];
376 unsigned char h_i[MBEDTLS_MD_MAX_SIZE];
377 const mbedtls_md_info_t *md_info;
378 mbedtls_md_context_t md_ctx;
379 int ret;
380
381 mbedtls_md_init( &md_ctx );
382
383 if( ( md_info = mbedtls_md_info_from_type( md_type ) ) == NULL )
384 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
385
386 md_len = mbedtls_md_get_size( md_info );
387
388 if( sizeof( tmp ) < md_len + strlen( label ) + rlen )
389 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
390
391 nb = strlen( label );
392 memcpy( tmp + md_len, label, nb );
393 memcpy( tmp + md_len + nb, random, rlen );
394 nb += rlen;
395
396 /*
397 * Compute P_<hash>(secret, label + random)[0..dlen]
398 */
399 if ( ( ret = mbedtls_md_setup( &md_ctx, md_info, 1 ) ) != 0 )
400 return( ret );
401
402 mbedtls_md_hmac_starts( &md_ctx, secret, slen );
403 mbedtls_md_hmac_update( &md_ctx, tmp + md_len, nb );
404 mbedtls_md_hmac_finish( &md_ctx, tmp );
405
406 for( i = 0; i < dlen; i += md_len )
407 {
408 mbedtls_md_hmac_reset ( &md_ctx );
409 mbedtls_md_hmac_update( &md_ctx, tmp, md_len + nb );
410 mbedtls_md_hmac_finish( &md_ctx, h_i );
411
412 mbedtls_md_hmac_reset ( &md_ctx );
413 mbedtls_md_hmac_update( &md_ctx, tmp, md_len );
414 mbedtls_md_hmac_finish( &md_ctx, tmp );
415
416 k = ( i + md_len > dlen ) ? dlen % md_len : md_len;
417
418 for( j = 0; j < k; j++ )
419 dstbuf[i + j] = h_i[j];
420 }
421
422 mbedtls_md_free( &md_ctx );
423
424 mbedtls_zeroize( tmp, sizeof( tmp ) );
425 mbedtls_zeroize( h_i, sizeof( h_i ) );
426
427 return( 0 );
428 }
429
430 #if defined(MBEDTLS_SHA256_C)
tls_prf_sha256(const unsigned char * secret,size_t slen,const char * label,const unsigned char * random,size_t rlen,unsigned char * dstbuf,size_t dlen)431 static int tls_prf_sha256( const unsigned char *secret, size_t slen,
432 const char *label,
433 const unsigned char *random, size_t rlen,
434 unsigned char *dstbuf, size_t dlen )
435 {
436 return( tls_prf_generic( MBEDTLS_MD_SHA256, secret, slen,
437 label, random, rlen, dstbuf, dlen ) );
438 }
439 #endif /* MBEDTLS_SHA256_C */
440
441 #if defined(MBEDTLS_SHA512_C)
tls_prf_sha384(const unsigned char * secret,size_t slen,const char * label,const unsigned char * random,size_t rlen,unsigned char * dstbuf,size_t dlen)442 static int tls_prf_sha384( const unsigned char *secret, size_t slen,
443 const char *label,
444 const unsigned char *random, size_t rlen,
445 unsigned char *dstbuf, size_t dlen )
446 {
447 return( tls_prf_generic( MBEDTLS_MD_SHA384, secret, slen,
448 label, random, rlen, dstbuf, dlen ) );
449 }
450 #endif /* MBEDTLS_SHA512_C */
451 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
452
453 static void ssl_update_checksum_start( mbedtls_ssl_context *, const unsigned char *, size_t );
454
455 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
456 defined(MBEDTLS_SSL_PROTO_TLS1_1)
457 static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *, const unsigned char *, size_t );
458 #endif
459
460 #if defined(MBEDTLS_SSL_PROTO_SSL3)
461 static void ssl_calc_verify_ssl( mbedtls_ssl_context *, unsigned char * );
462 static void ssl_calc_finished_ssl( mbedtls_ssl_context *, unsigned char *, int );
463 #endif
464
465 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
466 static void ssl_calc_verify_tls( mbedtls_ssl_context *, unsigned char * );
467 static void ssl_calc_finished_tls( mbedtls_ssl_context *, unsigned char *, int );
468 #endif
469
470 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
471 #if defined(MBEDTLS_SHA256_C)
472 static void ssl_update_checksum_sha256( mbedtls_ssl_context *, const unsigned char *, size_t );
473 static void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *,unsigned char * );
474 static void ssl_calc_finished_tls_sha256( mbedtls_ssl_context *,unsigned char *, int );
475 #endif
476
477 #if defined(MBEDTLS_SHA512_C)
478 static void ssl_update_checksum_sha384( mbedtls_ssl_context *, const unsigned char *, size_t );
479 static void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *, unsigned char * );
480 static void ssl_calc_finished_tls_sha384( mbedtls_ssl_context *, unsigned char *, int );
481 #endif
482 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
483
mbedtls_ssl_derive_keys(mbedtls_ssl_context * ssl)484 int mbedtls_ssl_derive_keys( mbedtls_ssl_context *ssl )
485 {
486 int ret = 0;
487 unsigned char tmp[64];
488 unsigned char keyblk[256];
489 unsigned char *key1;
490 unsigned char *key2;
491 unsigned char *mac_enc;
492 unsigned char *mac_dec;
493 size_t iv_copy_len;
494 const mbedtls_cipher_info_t *cipher_info;
495 const mbedtls_md_info_t *md_info;
496
497 mbedtls_ssl_session *session = ssl->session_negotiate;
498 mbedtls_ssl_transform *transform = ssl->transform_negotiate;
499 mbedtls_ssl_handshake_params *handshake = ssl->handshake;
500
501 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> derive keys" ) );
502
503 cipher_info = mbedtls_cipher_info_from_type( transform->ciphersuite_info->cipher );
504 if( cipher_info == NULL )
505 {
506 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cipher info for %d not found",
507 transform->ciphersuite_info->cipher ) );
508 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
509 }
510
511 md_info = mbedtls_md_info_from_type( transform->ciphersuite_info->mac );
512 if( md_info == NULL )
513 {
514 MBEDTLS_SSL_DEBUG_MSG( 1, ( "mbedtls_md info for %d not found",
515 transform->ciphersuite_info->mac ) );
516 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
517 }
518
519 /*
520 * Set appropriate PRF function and other SSL / TLS / TLS1.2 functions
521 */
522 #if defined(MBEDTLS_SSL_PROTO_SSL3)
523 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
524 {
525 handshake->tls_prf = ssl3_prf;
526 handshake->calc_verify = ssl_calc_verify_ssl;
527 handshake->calc_finished = ssl_calc_finished_ssl;
528 }
529 else
530 #endif
531 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
532 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
533 {
534 handshake->tls_prf = tls1_prf;
535 handshake->calc_verify = ssl_calc_verify_tls;
536 handshake->calc_finished = ssl_calc_finished_tls;
537 }
538 else
539 #endif
540 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
541 #if defined(MBEDTLS_SHA512_C)
542 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 &&
543 transform->ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
544 {
545 handshake->tls_prf = tls_prf_sha384;
546 handshake->calc_verify = ssl_calc_verify_tls_sha384;
547 handshake->calc_finished = ssl_calc_finished_tls_sha384;
548 }
549 else
550 #endif
551 #if defined(MBEDTLS_SHA256_C)
552 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
553 {
554 handshake->tls_prf = tls_prf_sha256;
555 handshake->calc_verify = ssl_calc_verify_tls_sha256;
556 handshake->calc_finished = ssl_calc_finished_tls_sha256;
557 }
558 else
559 #endif
560 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
561 {
562 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
563 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
564 }
565
566 /*
567 * SSLv3:
568 * master =
569 * MD5( premaster + SHA1( 'A' + premaster + randbytes ) ) +
570 * MD5( premaster + SHA1( 'BB' + premaster + randbytes ) ) +
571 * MD5( premaster + SHA1( 'CCC' + premaster + randbytes ) )
572 *
573 * TLSv1+:
574 * master = PRF( premaster, "master secret", randbytes )[0..47]
575 */
576 if( handshake->resume == 0 )
577 {
578 MBEDTLS_SSL_DEBUG_BUF( 3, "premaster secret", handshake->premaster,
579 handshake->pmslen );
580
581 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
582 if( ssl->handshake->extended_ms == MBEDTLS_SSL_EXTENDED_MS_ENABLED )
583 {
584 unsigned char session_hash[48];
585 size_t hash_len;
586
587 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using extended master secret" ) );
588
589 ssl->handshake->calc_verify( ssl, session_hash );
590
591 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
592 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
593 {
594 #if defined(MBEDTLS_SHA512_C)
595 if( ssl->transform_negotiate->ciphersuite_info->mac ==
596 MBEDTLS_MD_SHA384 )
597 {
598 hash_len = 48;
599 }
600 else
601 #endif
602 hash_len = 32;
603 }
604 else
605 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
606 hash_len = 36;
607
608 MBEDTLS_SSL_DEBUG_BUF( 3, "session hash", session_hash, hash_len );
609
610 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
611 "extended master secret",
612 session_hash, hash_len,
613 session->master, 48 );
614 if( ret != 0 )
615 {
616 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
617 return( ret );
618 }
619
620 }
621 else
622 #endif
623 ret = handshake->tls_prf( handshake->premaster, handshake->pmslen,
624 "master secret",
625 handshake->randbytes, 64,
626 session->master, 48 );
627 if( ret != 0 )
628 {
629 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
630 return( ret );
631 }
632
633 mbedtls_zeroize( handshake->premaster, sizeof(handshake->premaster) );
634 }
635 else
636 MBEDTLS_SSL_DEBUG_MSG( 3, ( "no premaster (session resumed)" ) );
637
638 /*
639 * Swap the client and server random values.
640 */
641 memcpy( tmp, handshake->randbytes, 64 );
642 memcpy( handshake->randbytes, tmp + 32, 32 );
643 memcpy( handshake->randbytes + 32, tmp, 32 );
644 mbedtls_zeroize( tmp, sizeof( tmp ) );
645
646 /*
647 * SSLv3:
648 * key block =
649 * MD5( master + SHA1( 'A' + master + randbytes ) ) +
650 * MD5( master + SHA1( 'BB' + master + randbytes ) ) +
651 * MD5( master + SHA1( 'CCC' + master + randbytes ) ) +
652 * MD5( master + SHA1( 'DDDD' + master + randbytes ) ) +
653 * ...
654 *
655 * TLSv1:
656 * key block = PRF( master, "key expansion", randbytes )
657 */
658 ret = handshake->tls_prf( session->master, 48, "key expansion",
659 handshake->randbytes, 64, keyblk, 256 );
660 if( ret != 0 )
661 {
662 MBEDTLS_SSL_DEBUG_RET( 1, "prf", ret );
663 return( ret );
664 }
665
666 MBEDTLS_SSL_DEBUG_MSG( 3, ( "ciphersuite = %s",
667 mbedtls_ssl_get_ciphersuite_name( session->ciphersuite ) ) );
668 MBEDTLS_SSL_DEBUG_BUF( 3, "master secret", session->master, 48 );
669 MBEDTLS_SSL_DEBUG_BUF( 4, "random bytes", handshake->randbytes, 64 );
670 MBEDTLS_SSL_DEBUG_BUF( 4, "key block", keyblk, 256 );
671
672 mbedtls_zeroize( handshake->randbytes, sizeof( handshake->randbytes ) );
673
674 /*
675 * Determine the appropriate key, IV and MAC length.
676 */
677
678 transform->keylen = cipher_info->key_bitlen / 8;
679
680 if( cipher_info->mode == MBEDTLS_MODE_GCM ||
681 cipher_info->mode == MBEDTLS_MODE_CCM )
682 {
683 transform->maclen = 0;
684
685 transform->ivlen = 12;
686 transform->fixed_ivlen = 4;
687
688 /* Minimum length is expicit IV + tag */
689 transform->minlen = transform->ivlen - transform->fixed_ivlen
690 + ( transform->ciphersuite_info->flags &
691 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16 );
692 }
693 else
694 {
695 /* Initialize HMAC contexts */
696 if( ( ret = mbedtls_md_setup( &transform->md_ctx_enc, md_info, 1 ) ) != 0 ||
697 ( ret = mbedtls_md_setup( &transform->md_ctx_dec, md_info, 1 ) ) != 0 )
698 {
699 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_md_setup", ret );
700 return( ret );
701 }
702
703 /* Get MAC length */
704 transform->maclen = mbedtls_md_get_size( md_info );
705
706 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
707 /*
708 * If HMAC is to be truncated, we shall keep the leftmost bytes,
709 * (rfc 6066 page 13 or rfc 2104 section 4),
710 * so we only need to adjust the length here.
711 */
712 if( session->trunc_hmac == MBEDTLS_SSL_TRUNC_HMAC_ENABLED )
713 transform->maclen = MBEDTLS_SSL_TRUNCATED_HMAC_LEN;
714 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
715
716 /* IV length */
717 transform->ivlen = cipher_info->iv_size;
718
719 /* Minimum length */
720 if( cipher_info->mode == MBEDTLS_MODE_STREAM )
721 transform->minlen = transform->maclen;
722 else
723 {
724 /*
725 * GenericBlockCipher:
726 * 1. if EtM is in use: one block plus MAC
727 * otherwise: * first multiple of blocklen greater than maclen
728 * 2. IV except for SSL3 and TLS 1.0
729 */
730 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
731 if( session->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
732 {
733 transform->minlen = transform->maclen
734 + cipher_info->block_size;
735 }
736 else
737 #endif
738 {
739 transform->minlen = transform->maclen
740 + cipher_info->block_size
741 - transform->maclen % cipher_info->block_size;
742 }
743
744 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
745 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ||
746 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_1 )
747 ; /* No need to adjust minlen */
748 else
749 #endif
750 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
751 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_2 ||
752 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_3 )
753 {
754 transform->minlen += transform->ivlen;
755 }
756 else
757 #endif
758 {
759 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
760 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
761 }
762 }
763 }
764
765 MBEDTLS_SSL_DEBUG_MSG( 3, ( "keylen: %d, minlen: %d, ivlen: %d, maclen: %d",
766 transform->keylen, transform->minlen, transform->ivlen,
767 transform->maclen ) );
768
769 /*
770 * Finally setup the cipher contexts, IVs and MAC secrets.
771 */
772 #if defined(MBEDTLS_SSL_CLI_C)
773 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
774 {
775 key1 = keyblk + transform->maclen * 2;
776 key2 = keyblk + transform->maclen * 2 + transform->keylen;
777
778 mac_enc = keyblk;
779 mac_dec = keyblk + transform->maclen;
780
781 /*
782 * This is not used in TLS v1.1.
783 */
784 iv_copy_len = ( transform->fixed_ivlen ) ?
785 transform->fixed_ivlen : transform->ivlen;
786 memcpy( transform->iv_enc, key2 + transform->keylen, iv_copy_len );
787 memcpy( transform->iv_dec, key2 + transform->keylen + iv_copy_len,
788 iv_copy_len );
789 }
790 else
791 #endif /* MBEDTLS_SSL_CLI_C */
792 #if defined(MBEDTLS_SSL_SRV_C)
793 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
794 {
795 key1 = keyblk + transform->maclen * 2 + transform->keylen;
796 key2 = keyblk + transform->maclen * 2;
797
798 mac_enc = keyblk + transform->maclen;
799 mac_dec = keyblk;
800
801 /*
802 * This is not used in TLS v1.1.
803 */
804 iv_copy_len = ( transform->fixed_ivlen ) ?
805 transform->fixed_ivlen : transform->ivlen;
806 memcpy( transform->iv_dec, key1 + transform->keylen, iv_copy_len );
807 memcpy( transform->iv_enc, key1 + transform->keylen + iv_copy_len,
808 iv_copy_len );
809 }
810 else
811 #endif /* MBEDTLS_SSL_SRV_C */
812 {
813 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
814 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
815 }
816
817 #if defined(MBEDTLS_SSL_PROTO_SSL3)
818 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
819 {
820 if( transform->maclen > sizeof transform->mac_enc )
821 {
822 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
823 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
824 }
825
826 memcpy( transform->mac_enc, mac_enc, transform->maclen );
827 memcpy( transform->mac_dec, mac_dec, transform->maclen );
828 }
829 else
830 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
831 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
832 defined(MBEDTLS_SSL_PROTO_TLS1_2)
833 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
834 {
835 mbedtls_md_hmac_starts( &transform->md_ctx_enc, mac_enc, transform->maclen );
836 mbedtls_md_hmac_starts( &transform->md_ctx_dec, mac_dec, transform->maclen );
837 }
838 else
839 #endif
840 {
841 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
842 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
843 }
844
845 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
846 if( mbedtls_ssl_hw_record_init != NULL )
847 {
848 int ret = 0;
849
850 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_init()" ) );
851
852 if( ( ret = mbedtls_ssl_hw_record_init( ssl, key1, key2, transform->keylen,
853 transform->iv_enc, transform->iv_dec,
854 iv_copy_len,
855 mac_enc, mac_dec,
856 transform->maclen ) ) != 0 )
857 {
858 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_init", ret );
859 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
860 }
861 }
862 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
863
864 #if defined(MBEDTLS_SSL_EXPORT_KEYS)
865 if( ssl->conf->f_export_keys != NULL )
866 {
867 ssl->conf->f_export_keys( ssl->conf->p_export_keys,
868 session->master, keyblk,
869 transform->maclen, transform->keylen,
870 iv_copy_len );
871 }
872 #endif
873
874 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_enc,
875 cipher_info ) ) != 0 )
876 {
877 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
878 return( ret );
879 }
880
881 if( ( ret = mbedtls_cipher_setup( &transform->cipher_ctx_dec,
882 cipher_info ) ) != 0 )
883 {
884 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setup", ret );
885 return( ret );
886 }
887
888 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_enc, key1,
889 cipher_info->key_bitlen,
890 MBEDTLS_ENCRYPT ) ) != 0 )
891 {
892 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
893 return( ret );
894 }
895
896 if( ( ret = mbedtls_cipher_setkey( &transform->cipher_ctx_dec, key2,
897 cipher_info->key_bitlen,
898 MBEDTLS_DECRYPT ) ) != 0 )
899 {
900 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_setkey", ret );
901 return( ret );
902 }
903
904 #if defined(MBEDTLS_CIPHER_MODE_CBC)
905 if( cipher_info->mode == MBEDTLS_MODE_CBC )
906 {
907 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_enc,
908 MBEDTLS_PADDING_NONE ) ) != 0 )
909 {
910 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
911 return( ret );
912 }
913
914 if( ( ret = mbedtls_cipher_set_padding_mode( &transform->cipher_ctx_dec,
915 MBEDTLS_PADDING_NONE ) ) != 0 )
916 {
917 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_set_padding_mode", ret );
918 return( ret );
919 }
920 }
921 #endif /* MBEDTLS_CIPHER_MODE_CBC */
922
923 mbedtls_zeroize( keyblk, sizeof( keyblk ) );
924
925 #if defined(MBEDTLS_ZLIB_SUPPORT)
926 // Initialize compression
927 //
928 if( session->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
929 {
930 if( ssl->compress_buf == NULL )
931 {
932 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Allocating compression buffer" ) );
933 ssl->compress_buf = mbedtls_calloc( 1, MBEDTLS_SSL_BUFFER_LEN );
934 if( ssl->compress_buf == NULL )
935 {
936 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
937 MBEDTLS_SSL_BUFFER_LEN ) );
938 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
939 }
940 }
941
942 MBEDTLS_SSL_DEBUG_MSG( 3, ( "Initializing zlib states" ) );
943
944 memset( &transform->ctx_deflate, 0, sizeof( transform->ctx_deflate ) );
945 memset( &transform->ctx_inflate, 0, sizeof( transform->ctx_inflate ) );
946
947 if( deflateInit( &transform->ctx_deflate,
948 Z_DEFAULT_COMPRESSION ) != Z_OK ||
949 inflateInit( &transform->ctx_inflate ) != Z_OK )
950 {
951 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Failed to initialize compression" ) );
952 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
953 }
954 }
955 #endif /* MBEDTLS_ZLIB_SUPPORT */
956
957 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= derive keys" ) );
958
959 return( 0 );
960 }
961
962 #if defined(MBEDTLS_SSL_PROTO_SSL3)
ssl_calc_verify_ssl(mbedtls_ssl_context * ssl,unsigned char hash[36])963 void ssl_calc_verify_ssl( mbedtls_ssl_context *ssl, unsigned char hash[36] )
964 {
965 mbedtls_md5_context md5;
966 mbedtls_sha1_context sha1;
967 unsigned char pad_1[48];
968 unsigned char pad_2[48];
969
970 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify ssl" ) );
971
972 mbedtls_md5_init( &md5 );
973 mbedtls_sha1_init( &sha1 );
974
975 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
976 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
977
978 memset( pad_1, 0x36, 48 );
979 memset( pad_2, 0x5C, 48 );
980
981 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
982 mbedtls_md5_update( &md5, pad_1, 48 );
983 mbedtls_md5_finish( &md5, hash );
984
985 mbedtls_md5_starts( &md5 );
986 mbedtls_md5_update( &md5, ssl->session_negotiate->master, 48 );
987 mbedtls_md5_update( &md5, pad_2, 48 );
988 mbedtls_md5_update( &md5, hash, 16 );
989 mbedtls_md5_finish( &md5, hash );
990
991 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
992 mbedtls_sha1_update( &sha1, pad_1, 40 );
993 mbedtls_sha1_finish( &sha1, hash + 16 );
994
995 mbedtls_sha1_starts( &sha1 );
996 mbedtls_sha1_update( &sha1, ssl->session_negotiate->master, 48 );
997 mbedtls_sha1_update( &sha1, pad_2, 40 );
998 mbedtls_sha1_update( &sha1, hash + 16, 20 );
999 mbedtls_sha1_finish( &sha1, hash + 16 );
1000
1001 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1002 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1003
1004 mbedtls_md5_free( &md5 );
1005 mbedtls_sha1_free( &sha1 );
1006
1007 return;
1008 }
1009 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1010
1011 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
ssl_calc_verify_tls(mbedtls_ssl_context * ssl,unsigned char hash[36])1012 void ssl_calc_verify_tls( mbedtls_ssl_context *ssl, unsigned char hash[36] )
1013 {
1014 mbedtls_md5_context md5;
1015 mbedtls_sha1_context sha1;
1016
1017 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify tls" ) );
1018
1019 mbedtls_md5_init( &md5 );
1020 mbedtls_sha1_init( &sha1 );
1021
1022 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
1023 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
1024
1025 mbedtls_md5_finish( &md5, hash );
1026 mbedtls_sha1_finish( &sha1, hash + 16 );
1027
1028 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 36 );
1029 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1030
1031 mbedtls_md5_free( &md5 );
1032 mbedtls_sha1_free( &sha1 );
1033
1034 return;
1035 }
1036 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
1037
1038 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
1039 #if defined(MBEDTLS_SHA256_C)
ssl_calc_verify_tls_sha256(mbedtls_ssl_context * ssl,unsigned char hash[32])1040 void ssl_calc_verify_tls_sha256( mbedtls_ssl_context *ssl, unsigned char hash[32] )
1041 {
1042 mbedtls_sha256_context sha256;
1043
1044 mbedtls_sha256_init( &sha256 );
1045
1046 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha256" ) );
1047
1048 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
1049 mbedtls_sha256_finish( &sha256, hash );
1050
1051 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 32 );
1052 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1053
1054 mbedtls_sha256_free( &sha256 );
1055
1056 return;
1057 }
1058 #endif /* MBEDTLS_SHA256_C */
1059
1060 #if defined(MBEDTLS_SHA512_C)
ssl_calc_verify_tls_sha384(mbedtls_ssl_context * ssl,unsigned char hash[48])1061 void ssl_calc_verify_tls_sha384( mbedtls_ssl_context *ssl, unsigned char hash[48] )
1062 {
1063 mbedtls_sha512_context sha512;
1064
1065 mbedtls_sha512_init( &sha512 );
1066
1067 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc verify sha384" ) );
1068
1069 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
1070 mbedtls_sha512_finish( &sha512, hash );
1071
1072 MBEDTLS_SSL_DEBUG_BUF( 3, "calculated verify result", hash, 48 );
1073 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc verify" ) );
1074
1075 mbedtls_sha512_free( &sha512 );
1076
1077 return;
1078 }
1079 #endif /* MBEDTLS_SHA512_C */
1080 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
1081
1082 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
mbedtls_ssl_psk_derive_premaster(mbedtls_ssl_context * ssl,mbedtls_key_exchange_type_t key_ex)1083 int mbedtls_ssl_psk_derive_premaster( mbedtls_ssl_context *ssl, mbedtls_key_exchange_type_t key_ex )
1084 {
1085 unsigned char *p = ssl->handshake->premaster;
1086 unsigned char *end = p + sizeof( ssl->handshake->premaster );
1087 const unsigned char *psk = ssl->conf->psk;
1088 size_t psk_len = ssl->conf->psk_len;
1089
1090 /* If the psk callback was called, use its result */
1091 if( ssl->handshake->psk != NULL )
1092 {
1093 psk = ssl->handshake->psk;
1094 psk_len = ssl->handshake->psk_len;
1095 }
1096
1097 /*
1098 * PMS = struct {
1099 * opaque other_secret<0..2^16-1>;
1100 * opaque psk<0..2^16-1>;
1101 * };
1102 * with "other_secret" depending on the particular key exchange
1103 */
1104 #if defined(MBEDTLS_KEY_EXCHANGE_PSK_ENABLED)
1105 if( key_ex == MBEDTLS_KEY_EXCHANGE_PSK )
1106 {
1107 if( end - p < 2 )
1108 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1109
1110 *(p++) = (unsigned char)( psk_len >> 8 );
1111 *(p++) = (unsigned char)( psk_len );
1112
1113 if( end < p || (size_t)( end - p ) < psk_len )
1114 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1115
1116 memset( p, 0, psk_len );
1117 p += psk_len;
1118 }
1119 else
1120 #endif /* MBEDTLS_KEY_EXCHANGE_PSK_ENABLED */
1121 #if defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED)
1122 if( key_ex == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
1123 {
1124 /*
1125 * other_secret already set by the ClientKeyExchange message,
1126 * and is 48 bytes long
1127 */
1128 *p++ = 0;
1129 *p++ = 48;
1130 p += 48;
1131 }
1132 else
1133 #endif /* MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED */
1134 #if defined(MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED)
1135 if( key_ex == MBEDTLS_KEY_EXCHANGE_DHE_PSK )
1136 {
1137 int ret;
1138 size_t len;
1139
1140 /* Write length only when we know the actual value */
1141 if( ( ret = mbedtls_dhm_calc_secret( &ssl->handshake->dhm_ctx,
1142 p + 2, end - ( p + 2 ), &len,
1143 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
1144 {
1145 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_dhm_calc_secret", ret );
1146 return( ret );
1147 }
1148 *(p++) = (unsigned char)( len >> 8 );
1149 *(p++) = (unsigned char)( len );
1150 p += len;
1151
1152 MBEDTLS_SSL_DEBUG_MPI( 3, "DHM: K ", &ssl->handshake->dhm_ctx.K );
1153 }
1154 else
1155 #endif /* MBEDTLS_KEY_EXCHANGE_DHE_PSK_ENABLED */
1156 #if defined(MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED)
1157 if( key_ex == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK )
1158 {
1159 int ret;
1160 size_t zlen;
1161
1162 if( ( ret = mbedtls_ecdh_calc_secret( &ssl->handshake->ecdh_ctx, &zlen,
1163 p + 2, end - ( p + 2 ),
1164 ssl->conf->f_rng, ssl->conf->p_rng ) ) != 0 )
1165 {
1166 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ecdh_calc_secret", ret );
1167 return( ret );
1168 }
1169
1170 *(p++) = (unsigned char)( zlen >> 8 );
1171 *(p++) = (unsigned char)( zlen );
1172 p += zlen;
1173
1174 MBEDTLS_SSL_DEBUG_MPI( 3, "ECDH: z", &ssl->handshake->ecdh_ctx.z );
1175 }
1176 else
1177 #endif /* MBEDTLS_KEY_EXCHANGE_ECDHE_PSK_ENABLED */
1178 {
1179 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1180 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1181 }
1182
1183 /* opaque psk<0..2^16-1>; */
1184 if( end - p < 2 )
1185 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1186
1187 *(p++) = (unsigned char)( psk_len >> 8 );
1188 *(p++) = (unsigned char)( psk_len );
1189
1190 if( end < p || (size_t)( end - p ) < psk_len )
1191 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
1192
1193 memcpy( p, psk, psk_len );
1194 p += psk_len;
1195
1196 ssl->handshake->pmslen = p - ssl->handshake->premaster;
1197
1198 return( 0 );
1199 }
1200 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
1201
1202 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1203 /*
1204 * SSLv3.0 MAC functions
1205 */
ssl_mac(mbedtls_md_context_t * md_ctx,unsigned char * secret,unsigned char * buf,size_t len,unsigned char * ctr,int type)1206 static void ssl_mac( mbedtls_md_context_t *md_ctx, unsigned char *secret,
1207 unsigned char *buf, size_t len,
1208 unsigned char *ctr, int type )
1209 {
1210 unsigned char header[11];
1211 unsigned char padding[48];
1212 int padlen;
1213 int md_size = mbedtls_md_get_size( md_ctx->md_info );
1214 int md_type = mbedtls_md_get_type( md_ctx->md_info );
1215
1216 /* Only MD5 and SHA-1 supported */
1217 if( md_type == MBEDTLS_MD_MD5 )
1218 padlen = 48;
1219 else
1220 padlen = 40;
1221
1222 memcpy( header, ctr, 8 );
1223 header[ 8] = (unsigned char) type;
1224 header[ 9] = (unsigned char)( len >> 8 );
1225 header[10] = (unsigned char)( len );
1226
1227 memset( padding, 0x36, padlen );
1228 mbedtls_md_starts( md_ctx );
1229 mbedtls_md_update( md_ctx, secret, md_size );
1230 mbedtls_md_update( md_ctx, padding, padlen );
1231 mbedtls_md_update( md_ctx, header, 11 );
1232 mbedtls_md_update( md_ctx, buf, len );
1233 mbedtls_md_finish( md_ctx, buf + len );
1234
1235 memset( padding, 0x5C, padlen );
1236 mbedtls_md_starts( md_ctx );
1237 mbedtls_md_update( md_ctx, secret, md_size );
1238 mbedtls_md_update( md_ctx, padding, padlen );
1239 mbedtls_md_update( md_ctx, buf + len, md_size );
1240 mbedtls_md_finish( md_ctx, buf + len );
1241 }
1242 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1243
1244 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER) || \
1245 ( defined(MBEDTLS_CIPHER_MODE_CBC) && \
1246 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) ) )
1247 #define SSL_SOME_MODES_USE_MAC
1248 #endif
1249
1250 /*
1251 * Encryption/decryption functions
1252 */
ssl_encrypt_buf(mbedtls_ssl_context * ssl)1253 static int ssl_encrypt_buf( mbedtls_ssl_context *ssl )
1254 {
1255 mbedtls_cipher_mode_t mode;
1256 int auth_done = 0;
1257
1258 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> encrypt buf" ) );
1259
1260 if( ssl->session_out == NULL || ssl->transform_out == NULL )
1261 {
1262 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1263 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1264 }
1265
1266 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc );
1267
1268 MBEDTLS_SSL_DEBUG_BUF( 4, "before encrypt: output payload",
1269 ssl->out_msg, ssl->out_msglen );
1270
1271 /*
1272 * Add MAC before if needed
1273 */
1274 #if defined(SSL_SOME_MODES_USE_MAC)
1275 if( mode == MBEDTLS_MODE_STREAM ||
1276 ( mode == MBEDTLS_MODE_CBC
1277 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1278 && ssl->session_out->encrypt_then_mac == MBEDTLS_SSL_ETM_DISABLED
1279 #endif
1280 ) )
1281 {
1282 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1283 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
1284 {
1285 ssl_mac( &ssl->transform_out->md_ctx_enc,
1286 ssl->transform_out->mac_enc,
1287 ssl->out_msg, ssl->out_msglen,
1288 ssl->out_ctr, ssl->out_msgtype );
1289 }
1290 else
1291 #endif
1292 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1293 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1294 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
1295 {
1296 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_ctr, 8 );
1297 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_hdr, 3 );
1298 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, ssl->out_len, 2 );
1299 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
1300 ssl->out_msg, ssl->out_msglen );
1301 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc,
1302 ssl->out_msg + ssl->out_msglen );
1303 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
1304 }
1305 else
1306 #endif
1307 {
1308 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1309 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1310 }
1311
1312 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac",
1313 ssl->out_msg + ssl->out_msglen,
1314 ssl->transform_out->maclen );
1315
1316 ssl->out_msglen += ssl->transform_out->maclen;
1317 auth_done++;
1318 }
1319 #endif /* AEAD not the only option */
1320
1321 /*
1322 * Encrypt
1323 */
1324 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1325 if( mode == MBEDTLS_MODE_STREAM )
1326 {
1327 int ret;
1328 size_t olen = 0;
1329
1330 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
1331 "including %d bytes of padding",
1332 ssl->out_msglen, 0 ) );
1333
1334 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
1335 ssl->transform_out->iv_enc,
1336 ssl->transform_out->ivlen,
1337 ssl->out_msg, ssl->out_msglen,
1338 ssl->out_msg, &olen ) ) != 0 )
1339 {
1340 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1341 return( ret );
1342 }
1343
1344 if( ssl->out_msglen != olen )
1345 {
1346 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1347 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1348 }
1349 }
1350 else
1351 #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1352 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1353 if( mode == MBEDTLS_MODE_GCM ||
1354 mode == MBEDTLS_MODE_CCM )
1355 {
1356 int ret;
1357 size_t enc_msglen, olen;
1358 unsigned char *enc_msg;
1359 unsigned char add_data[13];
1360 unsigned char taglen = ssl->transform_out->ciphersuite_info->flags &
1361 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
1362
1363 memcpy( add_data, ssl->out_ctr, 8 );
1364 add_data[8] = ssl->out_msgtype;
1365 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
1366 ssl->conf->transport, add_data + 9 );
1367 add_data[11] = ( ssl->out_msglen >> 8 ) & 0xFF;
1368 add_data[12] = ssl->out_msglen & 0xFF;
1369
1370 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
1371 add_data, 13 );
1372
1373 /*
1374 * Generate IV
1375 */
1376 if( ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen != 8 )
1377 {
1378 /* Reminder if we ever add an AEAD mode with a different size */
1379 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1380 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1381 }
1382
1383 memcpy( ssl->transform_out->iv_enc + ssl->transform_out->fixed_ivlen,
1384 ssl->out_ctr, 8 );
1385 memcpy( ssl->out_iv, ssl->out_ctr, 8 );
1386
1387 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->out_iv,
1388 ssl->transform_out->ivlen - ssl->transform_out->fixed_ivlen );
1389
1390 /*
1391 * Fix pointer positions and message length with added IV
1392 */
1393 enc_msg = ssl->out_msg;
1394 enc_msglen = ssl->out_msglen;
1395 ssl->out_msglen += ssl->transform_out->ivlen -
1396 ssl->transform_out->fixed_ivlen;
1397
1398 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
1399 "including %d bytes of padding",
1400 ssl->out_msglen, 0 ) );
1401
1402 /*
1403 * Encrypt and authenticate
1404 */
1405 if( ( ret = mbedtls_cipher_auth_encrypt( &ssl->transform_out->cipher_ctx_enc,
1406 ssl->transform_out->iv_enc,
1407 ssl->transform_out->ivlen,
1408 add_data, 13,
1409 enc_msg, enc_msglen,
1410 enc_msg, &olen,
1411 enc_msg + enc_msglen, taglen ) ) != 0 )
1412 {
1413 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_encrypt", ret );
1414 return( ret );
1415 }
1416
1417 if( olen != enc_msglen )
1418 {
1419 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1420 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1421 }
1422
1423 ssl->out_msglen += taglen;
1424 auth_done++;
1425
1426 MBEDTLS_SSL_DEBUG_BUF( 4, "after encrypt: tag", enc_msg + enc_msglen, taglen );
1427 }
1428 else
1429 #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1430 #if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1431 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1432 if( mode == MBEDTLS_MODE_CBC )
1433 {
1434 int ret;
1435 unsigned char *enc_msg;
1436 size_t enc_msglen, padlen, olen = 0, i;
1437
1438 padlen = ssl->transform_out->ivlen - ( ssl->out_msglen + 1 ) %
1439 ssl->transform_out->ivlen;
1440 if( padlen == ssl->transform_out->ivlen )
1441 padlen = 0;
1442
1443 for( i = 0; i <= padlen; i++ )
1444 ssl->out_msg[ssl->out_msglen + i] = (unsigned char) padlen;
1445
1446 ssl->out_msglen += padlen + 1;
1447
1448 enc_msglen = ssl->out_msglen;
1449 enc_msg = ssl->out_msg;
1450
1451 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1452 /*
1453 * Prepend per-record IV for block cipher in TLS v1.1 and up as per
1454 * Method 1 (6.2.3.2. in RFC4346 and RFC5246)
1455 */
1456 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
1457 {
1458 /*
1459 * Generate IV
1460 */
1461 ret = ssl->conf->f_rng( ssl->conf->p_rng, ssl->transform_out->iv_enc,
1462 ssl->transform_out->ivlen );
1463 if( ret != 0 )
1464 return( ret );
1465
1466 memcpy( ssl->out_iv, ssl->transform_out->iv_enc,
1467 ssl->transform_out->ivlen );
1468
1469 /*
1470 * Fix pointer positions and message length with added IV
1471 */
1472 enc_msg = ssl->out_msg;
1473 enc_msglen = ssl->out_msglen;
1474 ssl->out_msglen += ssl->transform_out->ivlen;
1475 }
1476 #endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
1477
1478 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before encrypt: msglen = %d, "
1479 "including %d bytes of IV and %d bytes of padding",
1480 ssl->out_msglen, ssl->transform_out->ivlen,
1481 padlen + 1 ) );
1482
1483 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_out->cipher_ctx_enc,
1484 ssl->transform_out->iv_enc,
1485 ssl->transform_out->ivlen,
1486 enc_msg, enc_msglen,
1487 enc_msg, &olen ) ) != 0 )
1488 {
1489 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1490 return( ret );
1491 }
1492
1493 if( enc_msglen != olen )
1494 {
1495 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1496 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1497 }
1498
1499 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1500 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
1501 {
1502 /*
1503 * Save IV in SSL3 and TLS1
1504 */
1505 memcpy( ssl->transform_out->iv_enc,
1506 ssl->transform_out->cipher_ctx_enc.iv,
1507 ssl->transform_out->ivlen );
1508 }
1509 #endif
1510
1511 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1512 if( auth_done == 0 )
1513 {
1514 /*
1515 * MAC(MAC_write_key, seq_num +
1516 * TLSCipherText.type +
1517 * TLSCipherText.version +
1518 * length_of( (IV +) ENC(...) ) +
1519 * IV + // except for TLS 1.0
1520 * ENC(content + padding + padding_length));
1521 */
1522 unsigned char pseudo_hdr[13];
1523
1524 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
1525
1526 memcpy( pseudo_hdr + 0, ssl->out_ctr, 8 );
1527 memcpy( pseudo_hdr + 8, ssl->out_hdr, 3 );
1528 pseudo_hdr[11] = (unsigned char)( ( ssl->out_msglen >> 8 ) & 0xFF );
1529 pseudo_hdr[12] = (unsigned char)( ( ssl->out_msglen ) & 0xFF );
1530
1531 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
1532
1533 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc, pseudo_hdr, 13 );
1534 mbedtls_md_hmac_update( &ssl->transform_out->md_ctx_enc,
1535 ssl->out_iv, ssl->out_msglen );
1536 mbedtls_md_hmac_finish( &ssl->transform_out->md_ctx_enc,
1537 ssl->out_iv + ssl->out_msglen );
1538 mbedtls_md_hmac_reset( &ssl->transform_out->md_ctx_enc );
1539
1540 ssl->out_msglen += ssl->transform_out->maclen;
1541 auth_done++;
1542 }
1543 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
1544 }
1545 else
1546 #endif /* MBEDTLS_CIPHER_MODE_CBC &&
1547 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
1548 {
1549 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1550 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1551 }
1552
1553 /* Make extra sure authentication was performed, exactly once */
1554 if( auth_done != 1 )
1555 {
1556 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1557 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1558 }
1559
1560 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= encrypt buf" ) );
1561
1562 return( 0 );
1563 }
1564
1565 #define SSL_MAX_MAC_SIZE 48
1566
ssl_decrypt_buf(mbedtls_ssl_context * ssl)1567 static int ssl_decrypt_buf( mbedtls_ssl_context *ssl )
1568 {
1569 size_t i;
1570 mbedtls_cipher_mode_t mode;
1571 int auth_done = 0;
1572 #if defined(SSL_SOME_MODES_USE_MAC)
1573 size_t padlen = 0, correct = 1;
1574 #endif
1575
1576 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decrypt buf" ) );
1577
1578 if( ssl->session_in == NULL || ssl->transform_in == NULL )
1579 {
1580 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1581 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1582 }
1583
1584 mode = mbedtls_cipher_get_cipher_mode( &ssl->transform_in->cipher_ctx_dec );
1585
1586 if( ssl->in_msglen < ssl->transform_in->minlen )
1587 {
1588 MBEDTLS_SSL_DEBUG_MSG( 1, ( "in_msglen (%d) < minlen (%d)",
1589 ssl->in_msglen, ssl->transform_in->minlen ) );
1590 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1591 }
1592
1593 #if defined(MBEDTLS_ARC4_C) || defined(MBEDTLS_CIPHER_NULL_CIPHER)
1594 if( mode == MBEDTLS_MODE_STREAM )
1595 {
1596 int ret;
1597 size_t olen = 0;
1598
1599 padlen = 0;
1600
1601 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
1602 ssl->transform_in->iv_dec,
1603 ssl->transform_in->ivlen,
1604 ssl->in_msg, ssl->in_msglen,
1605 ssl->in_msg, &olen ) ) != 0 )
1606 {
1607 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1608 return( ret );
1609 }
1610
1611 if( ssl->in_msglen != olen )
1612 {
1613 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1614 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1615 }
1616 }
1617 else
1618 #endif /* MBEDTLS_ARC4_C || MBEDTLS_CIPHER_NULL_CIPHER */
1619 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CCM_C)
1620 if( mode == MBEDTLS_MODE_GCM ||
1621 mode == MBEDTLS_MODE_CCM )
1622 {
1623 int ret;
1624 size_t dec_msglen, olen;
1625 unsigned char *dec_msg;
1626 unsigned char *dec_msg_result;
1627 unsigned char add_data[13];
1628 unsigned char taglen = ssl->transform_in->ciphersuite_info->flags &
1629 MBEDTLS_CIPHERSUITE_SHORT_TAG ? 8 : 16;
1630 size_t explicit_iv_len = ssl->transform_in->ivlen -
1631 ssl->transform_in->fixed_ivlen;
1632
1633 if( ssl->in_msglen < explicit_iv_len + taglen )
1634 {
1635 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < explicit_iv_len (%d) "
1636 "+ taglen (%d)", ssl->in_msglen,
1637 explicit_iv_len, taglen ) );
1638 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1639 }
1640 dec_msglen = ssl->in_msglen - explicit_iv_len - taglen;
1641
1642 dec_msg = ssl->in_msg;
1643 dec_msg_result = ssl->in_msg;
1644 ssl->in_msglen = dec_msglen;
1645
1646 memcpy( add_data, ssl->in_ctr, 8 );
1647 add_data[8] = ssl->in_msgtype;
1648 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
1649 ssl->conf->transport, add_data + 9 );
1650 add_data[11] = ( ssl->in_msglen >> 8 ) & 0xFF;
1651 add_data[12] = ssl->in_msglen & 0xFF;
1652
1653 MBEDTLS_SSL_DEBUG_BUF( 4, "additional data used for AEAD",
1654 add_data, 13 );
1655
1656 memcpy( ssl->transform_in->iv_dec + ssl->transform_in->fixed_ivlen,
1657 ssl->in_iv,
1658 ssl->transform_in->ivlen - ssl->transform_in->fixed_ivlen );
1659
1660 MBEDTLS_SSL_DEBUG_BUF( 4, "IV used", ssl->transform_in->iv_dec,
1661 ssl->transform_in->ivlen );
1662 MBEDTLS_SSL_DEBUG_BUF( 4, "TAG used", dec_msg + dec_msglen, taglen );
1663
1664 /*
1665 * Decrypt and authenticate
1666 */
1667 if( ( ret = mbedtls_cipher_auth_decrypt( &ssl->transform_in->cipher_ctx_dec,
1668 ssl->transform_in->iv_dec,
1669 ssl->transform_in->ivlen,
1670 add_data, 13,
1671 dec_msg, dec_msglen,
1672 dec_msg_result, &olen,
1673 dec_msg + dec_msglen, taglen ) ) != 0 )
1674 {
1675 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_auth_decrypt", ret );
1676
1677 if( ret == MBEDTLS_ERR_CIPHER_AUTH_FAILED )
1678 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1679
1680 return( ret );
1681 }
1682 auth_done++;
1683
1684 if( olen != dec_msglen )
1685 {
1686 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1687 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1688 }
1689 }
1690 else
1691 #endif /* MBEDTLS_GCM_C || MBEDTLS_CCM_C */
1692 #if defined(MBEDTLS_CIPHER_MODE_CBC) && \
1693 ( defined(MBEDTLS_AES_C) || defined(MBEDTLS_CAMELLIA_C) )
1694 if( mode == MBEDTLS_MODE_CBC )
1695 {
1696 /*
1697 * Decrypt and check the padding
1698 */
1699 int ret;
1700 unsigned char *dec_msg;
1701 unsigned char *dec_msg_result;
1702 size_t dec_msglen;
1703 size_t minlen = 0;
1704 size_t olen = 0;
1705
1706 /*
1707 * Check immediate ciphertext sanity
1708 */
1709 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1710 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
1711 minlen += ssl->transform_in->ivlen;
1712 #endif
1713
1714 if( ssl->in_msglen < minlen + ssl->transform_in->ivlen ||
1715 ssl->in_msglen < minlen + ssl->transform_in->maclen + 1 )
1716 {
1717 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < max( ivlen(%d), maclen (%d) "
1718 "+ 1 ) ( + expl IV )", ssl->in_msglen,
1719 ssl->transform_in->ivlen,
1720 ssl->transform_in->maclen ) );
1721 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1722 }
1723
1724 dec_msglen = ssl->in_msglen;
1725 dec_msg = ssl->in_msg;
1726 dec_msg_result = ssl->in_msg;
1727
1728 /*
1729 * Authenticate before decrypt if enabled
1730 */
1731 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
1732 if( ssl->session_in->encrypt_then_mac == MBEDTLS_SSL_ETM_ENABLED )
1733 {
1734 unsigned char computed_mac[SSL_MAX_MAC_SIZE];
1735 unsigned char pseudo_hdr[13];
1736
1737 MBEDTLS_SSL_DEBUG_MSG( 3, ( "using encrypt then mac" ) );
1738
1739 dec_msglen -= ssl->transform_in->maclen;
1740 ssl->in_msglen -= ssl->transform_in->maclen;
1741
1742 memcpy( pseudo_hdr + 0, ssl->in_ctr, 8 );
1743 memcpy( pseudo_hdr + 8, ssl->in_hdr, 3 );
1744 pseudo_hdr[11] = (unsigned char)( ( ssl->in_msglen >> 8 ) & 0xFF );
1745 pseudo_hdr[12] = (unsigned char)( ( ssl->in_msglen ) & 0xFF );
1746
1747 MBEDTLS_SSL_DEBUG_BUF( 4, "MAC'd meta-data", pseudo_hdr, 13 );
1748
1749 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, pseudo_hdr, 13 );
1750 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec,
1751 ssl->in_iv, ssl->in_msglen );
1752 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec, computed_mac );
1753 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
1754
1755 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", ssl->in_iv + ssl->in_msglen,
1756 ssl->transform_in->maclen );
1757 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac", computed_mac,
1758 ssl->transform_in->maclen );
1759
1760 if( mbedtls_ssl_safer_memcmp( ssl->in_iv + ssl->in_msglen, computed_mac,
1761 ssl->transform_in->maclen ) != 0 )
1762 {
1763 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
1764
1765 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1766 }
1767 auth_done++;
1768 }
1769 #endif /* MBEDTLS_SSL_ENCRYPT_THEN_MAC */
1770
1771 /*
1772 * Check length sanity
1773 */
1774 if( ssl->in_msglen % ssl->transform_in->ivlen != 0 )
1775 {
1776 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) %% ivlen (%d) != 0",
1777 ssl->in_msglen, ssl->transform_in->ivlen ) );
1778 return( MBEDTLS_ERR_SSL_INVALID_MAC );
1779 }
1780
1781 #if defined(MBEDTLS_SSL_PROTO_TLS1_1) || defined(MBEDTLS_SSL_PROTO_TLS1_2)
1782 /*
1783 * Initialize for prepended IV for block cipher in TLS v1.1 and up
1784 */
1785 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
1786 {
1787 dec_msglen -= ssl->transform_in->ivlen;
1788 ssl->in_msglen -= ssl->transform_in->ivlen;
1789
1790 for( i = 0; i < ssl->transform_in->ivlen; i++ )
1791 ssl->transform_in->iv_dec[i] = ssl->in_iv[i];
1792 }
1793 #endif /* MBEDTLS_SSL_PROTO_TLS1_1 || MBEDTLS_SSL_PROTO_TLS1_2 */
1794
1795 if( ( ret = mbedtls_cipher_crypt( &ssl->transform_in->cipher_ctx_dec,
1796 ssl->transform_in->iv_dec,
1797 ssl->transform_in->ivlen,
1798 dec_msg, dec_msglen,
1799 dec_msg_result, &olen ) ) != 0 )
1800 {
1801 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_cipher_crypt", ret );
1802 return( ret );
1803 }
1804
1805 if( dec_msglen != olen )
1806 {
1807 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1808 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1809 }
1810
1811 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1)
1812 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_2 )
1813 {
1814 /*
1815 * Save IV in SSL3 and TLS1
1816 */
1817 memcpy( ssl->transform_in->iv_dec,
1818 ssl->transform_in->cipher_ctx_dec.iv,
1819 ssl->transform_in->ivlen );
1820 }
1821 #endif
1822
1823 padlen = 1 + ssl->in_msg[ssl->in_msglen - 1];
1824
1825 if( ssl->in_msglen < ssl->transform_in->maclen + padlen &&
1826 auth_done == 0 )
1827 {
1828 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1829 MBEDTLS_SSL_DEBUG_MSG( 1, ( "msglen (%d) < maclen (%d) + padlen (%d)",
1830 ssl->in_msglen, ssl->transform_in->maclen, padlen ) );
1831 #endif
1832 padlen = 0;
1833 correct = 0;
1834 }
1835
1836 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1837 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
1838 {
1839 if( padlen > ssl->transform_in->ivlen )
1840 {
1841 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1842 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding length: is %d, "
1843 "should be no more than %d",
1844 padlen, ssl->transform_in->ivlen ) );
1845 #endif
1846 correct = 0;
1847 }
1848 }
1849 else
1850 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1851 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1852 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1853 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
1854 {
1855 /*
1856 * TLSv1+: always check the padding up to the first failure
1857 * and fake check up to 256 bytes of padding
1858 */
1859 size_t pad_count = 0, real_count = 1;
1860 size_t padding_idx = ssl->in_msglen - padlen - 1;
1861
1862 /*
1863 * Padding is guaranteed to be incorrect if:
1864 * 1. padlen >= ssl->in_msglen
1865 *
1866 * 2. padding_idx >= MBEDTLS_SSL_MAX_CONTENT_LEN +
1867 * ssl->transform_in->maclen
1868 *
1869 * In both cases we reset padding_idx to a safe value (0) to
1870 * prevent out-of-buffer reads.
1871 */
1872 correct &= ( ssl->in_msglen >= padlen + 1 );
1873 correct &= ( padding_idx < MBEDTLS_SSL_MAX_CONTENT_LEN +
1874 ssl->transform_in->maclen );
1875
1876 padding_idx *= correct;
1877
1878 for( i = 1; i <= 256; i++ )
1879 {
1880 real_count &= ( i <= padlen );
1881 pad_count += real_count *
1882 ( ssl->in_msg[padding_idx + i] == padlen - 1 );
1883 }
1884
1885 correct &= ( pad_count == padlen ); /* Only 1 on correct padding */
1886
1887 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1888 if( padlen > 0 && correct == 0 )
1889 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad padding byte detected" ) );
1890 #endif
1891 padlen &= correct * 0x1FF;
1892 }
1893 else
1894 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
1895 MBEDTLS_SSL_PROTO_TLS1_2 */
1896 {
1897 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1898 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1899 }
1900
1901 ssl->in_msglen -= padlen;
1902 }
1903 else
1904 #endif /* MBEDTLS_CIPHER_MODE_CBC &&
1905 ( MBEDTLS_AES_C || MBEDTLS_CAMELLIA_C ) */
1906 {
1907 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1908 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1909 }
1910
1911 MBEDTLS_SSL_DEBUG_BUF( 4, "raw buffer after decryption",
1912 ssl->in_msg, ssl->in_msglen );
1913
1914 /*
1915 * Authenticate if not done yet.
1916 * Compute the MAC regardless of the padding result (RFC4346, CBCTIME).
1917 */
1918 #if defined(SSL_SOME_MODES_USE_MAC)
1919 if( auth_done == 0 )
1920 {
1921 unsigned char tmp[SSL_MAX_MAC_SIZE];
1922
1923 ssl->in_msglen -= ssl->transform_in->maclen;
1924
1925 ssl->in_len[0] = (unsigned char)( ssl->in_msglen >> 8 );
1926 ssl->in_len[1] = (unsigned char)( ssl->in_msglen );
1927
1928 memcpy( tmp, ssl->in_msg + ssl->in_msglen, ssl->transform_in->maclen );
1929
1930 #if defined(MBEDTLS_SSL_PROTO_SSL3)
1931 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
1932 {
1933 ssl_mac( &ssl->transform_in->md_ctx_dec,
1934 ssl->transform_in->mac_dec,
1935 ssl->in_msg, ssl->in_msglen,
1936 ssl->in_ctr, ssl->in_msgtype );
1937 }
1938 else
1939 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
1940 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
1941 defined(MBEDTLS_SSL_PROTO_TLS1_2)
1942 if( ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_0 )
1943 {
1944 /*
1945 * Process MAC and always update for padlen afterwards to make
1946 * total time independent of padlen
1947 *
1948 * extra_run compensates MAC check for padlen
1949 *
1950 * Known timing attacks:
1951 * - Lucky Thirteen (http://www.isg.rhul.ac.uk/tls/TLStiming.pdf)
1952 *
1953 * We use ( ( Lx + 8 ) / 64 ) to handle 'negative Lx' values
1954 * correctly. (We round down instead of up, so -56 is the correct
1955 * value for our calculations instead of -55)
1956 */
1957 size_t j, extra_run = 0;
1958 extra_run = ( 13 + ssl->in_msglen + padlen + 8 ) / 64 -
1959 ( 13 + ssl->in_msglen + 8 ) / 64;
1960
1961 extra_run &= correct * 0xFF;
1962
1963 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_ctr, 8 );
1964 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_hdr, 3 );
1965 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_len, 2 );
1966 mbedtls_md_hmac_update( &ssl->transform_in->md_ctx_dec, ssl->in_msg,
1967 ssl->in_msglen );
1968 mbedtls_md_hmac_finish( &ssl->transform_in->md_ctx_dec,
1969 ssl->in_msg + ssl->in_msglen );
1970 /* Call mbedtls_md_process at least once due to cache attacks */
1971 for( j = 0; j < extra_run + 1; j++ )
1972 mbedtls_md_process( &ssl->transform_in->md_ctx_dec, ssl->in_msg );
1973
1974 mbedtls_md_hmac_reset( &ssl->transform_in->md_ctx_dec );
1975 }
1976 else
1977 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
1978 MBEDTLS_SSL_PROTO_TLS1_2 */
1979 {
1980 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
1981 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
1982 }
1983
1984 MBEDTLS_SSL_DEBUG_BUF( 4, "message mac", tmp, ssl->transform_in->maclen );
1985 MBEDTLS_SSL_DEBUG_BUF( 4, "computed mac", ssl->in_msg + ssl->in_msglen,
1986 ssl->transform_in->maclen );
1987
1988 if( mbedtls_ssl_safer_memcmp( tmp, ssl->in_msg + ssl->in_msglen,
1989 ssl->transform_in->maclen ) != 0 )
1990 {
1991 #if defined(MBEDTLS_SSL_DEBUG_ALL)
1992 MBEDTLS_SSL_DEBUG_MSG( 1, ( "message mac does not match" ) );
1993 #endif
1994 correct = 0;
1995 }
1996 auth_done++;
1997
1998 /*
1999 * Finally check the correct flag
2000 */
2001 if( correct == 0 )
2002 return( MBEDTLS_ERR_SSL_INVALID_MAC );
2003 }
2004 #endif /* SSL_SOME_MODES_USE_MAC */
2005
2006 /* Make extra sure authentication was performed, exactly once */
2007 if( auth_done != 1 )
2008 {
2009 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2010 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2011 }
2012
2013 if( ssl->in_msglen == 0 )
2014 {
2015 ssl->nb_zero++;
2016
2017 /*
2018 * Three or more empty messages may be a DoS attack
2019 * (excessive CPU consumption).
2020 */
2021 if( ssl->nb_zero > 3 )
2022 {
2023 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received four consecutive empty "
2024 "messages, possible DoS attack" ) );
2025 return( MBEDTLS_ERR_SSL_INVALID_MAC );
2026 }
2027 }
2028 else
2029 ssl->nb_zero = 0;
2030
2031 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2032 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
2033 {
2034 ; /* in_ctr read from peer, not maintained internally */
2035 }
2036 else
2037 #endif
2038 {
2039 for( i = 8; i > ssl_ep_len( ssl ); i-- )
2040 if( ++ssl->in_ctr[i - 1] != 0 )
2041 break;
2042
2043 /* The loop goes to its end iff the counter is wrapping */
2044 if( i == ssl_ep_len( ssl ) )
2045 {
2046 MBEDTLS_SSL_DEBUG_MSG( 1, ( "incoming message counter would wrap" ) );
2047 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
2048 }
2049 }
2050
2051 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decrypt buf" ) );
2052
2053 return( 0 );
2054 }
2055
2056 #undef MAC_NONE
2057 #undef MAC_PLAINTEXT
2058 #undef MAC_CIPHERTEXT
2059
2060 #if defined(MBEDTLS_ZLIB_SUPPORT)
2061 /*
2062 * Compression/decompression functions
2063 */
ssl_compress_buf(mbedtls_ssl_context * ssl)2064 static int ssl_compress_buf( mbedtls_ssl_context *ssl )
2065 {
2066 int ret;
2067 unsigned char *msg_post = ssl->out_msg;
2068 size_t len_pre = ssl->out_msglen;
2069 unsigned char *msg_pre = ssl->compress_buf;
2070
2071 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> compress buf" ) );
2072
2073 if( len_pre == 0 )
2074 return( 0 );
2075
2076 memcpy( msg_pre, ssl->out_msg, len_pre );
2077
2078 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before compression: msglen = %d, ",
2079 ssl->out_msglen ) );
2080
2081 MBEDTLS_SSL_DEBUG_BUF( 4, "before compression: output payload",
2082 ssl->out_msg, ssl->out_msglen );
2083
2084 ssl->transform_out->ctx_deflate.next_in = msg_pre;
2085 ssl->transform_out->ctx_deflate.avail_in = len_pre;
2086 ssl->transform_out->ctx_deflate.next_out = msg_post;
2087 ssl->transform_out->ctx_deflate.avail_out = MBEDTLS_SSL_BUFFER_LEN;
2088
2089 ret = deflate( &ssl->transform_out->ctx_deflate, Z_SYNC_FLUSH );
2090 if( ret != Z_OK )
2091 {
2092 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform compression (%d)", ret ) );
2093 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
2094 }
2095
2096 ssl->out_msglen = MBEDTLS_SSL_BUFFER_LEN -
2097 ssl->transform_out->ctx_deflate.avail_out;
2098
2099 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after compression: msglen = %d, ",
2100 ssl->out_msglen ) );
2101
2102 MBEDTLS_SSL_DEBUG_BUF( 4, "after compression: output payload",
2103 ssl->out_msg, ssl->out_msglen );
2104
2105 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= compress buf" ) );
2106
2107 return( 0 );
2108 }
2109
ssl_decompress_buf(mbedtls_ssl_context * ssl)2110 static int ssl_decompress_buf( mbedtls_ssl_context *ssl )
2111 {
2112 int ret;
2113 unsigned char *msg_post = ssl->in_msg;
2114 size_t len_pre = ssl->in_msglen;
2115 unsigned char *msg_pre = ssl->compress_buf;
2116
2117 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> decompress buf" ) );
2118
2119 if( len_pre == 0 )
2120 return( 0 );
2121
2122 memcpy( msg_pre, ssl->in_msg, len_pre );
2123
2124 MBEDTLS_SSL_DEBUG_MSG( 3, ( "before decompression: msglen = %d, ",
2125 ssl->in_msglen ) );
2126
2127 MBEDTLS_SSL_DEBUG_BUF( 4, "before decompression: input payload",
2128 ssl->in_msg, ssl->in_msglen );
2129
2130 ssl->transform_in->ctx_inflate.next_in = msg_pre;
2131 ssl->transform_in->ctx_inflate.avail_in = len_pre;
2132 ssl->transform_in->ctx_inflate.next_out = msg_post;
2133 ssl->transform_in->ctx_inflate.avail_out = MBEDTLS_SSL_MAX_CONTENT_LEN;
2134
2135 ret = inflate( &ssl->transform_in->ctx_inflate, Z_SYNC_FLUSH );
2136 if( ret != Z_OK )
2137 {
2138 MBEDTLS_SSL_DEBUG_MSG( 1, ( "failed to perform decompression (%d)", ret ) );
2139 return( MBEDTLS_ERR_SSL_COMPRESSION_FAILED );
2140 }
2141
2142 ssl->in_msglen = MBEDTLS_SSL_MAX_CONTENT_LEN -
2143 ssl->transform_in->ctx_inflate.avail_out;
2144
2145 MBEDTLS_SSL_DEBUG_MSG( 3, ( "after decompression: msglen = %d, ",
2146 ssl->in_msglen ) );
2147
2148 MBEDTLS_SSL_DEBUG_BUF( 4, "after decompression: input payload",
2149 ssl->in_msg, ssl->in_msglen );
2150
2151 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= decompress buf" ) );
2152
2153 return( 0 );
2154 }
2155 #endif /* MBEDTLS_ZLIB_SUPPORT */
2156
2157 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
2158 static int ssl_write_hello_request( mbedtls_ssl_context *ssl );
2159
2160 #if defined(MBEDTLS_SSL_PROTO_DTLS)
ssl_resend_hello_request(mbedtls_ssl_context * ssl)2161 static int ssl_resend_hello_request( mbedtls_ssl_context *ssl )
2162 {
2163 /* If renegotiation is not enforced, retransmit until we would reach max
2164 * timeout if we were using the usual handshake doubling scheme */
2165 if( ssl->conf->renego_max_records < 0 )
2166 {
2167 uint32_t ratio = ssl->conf->hs_timeout_max / ssl->conf->hs_timeout_min + 1;
2168 unsigned char doublings = 1;
2169
2170 while( ratio != 0 )
2171 {
2172 ++doublings;
2173 ratio >>= 1;
2174 }
2175
2176 if( ++ssl->renego_records_seen > doublings )
2177 {
2178 MBEDTLS_SSL_DEBUG_MSG( 2, ( "no longer retransmitting hello request" ) );
2179 return( 0 );
2180 }
2181 }
2182
2183 return( ssl_write_hello_request( ssl ) );
2184 }
2185 #endif
2186 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
2187
2188 /*
2189 * Fill the input message buffer by appending data to it.
2190 * The amount of data already fetched is in ssl->in_left.
2191 *
2192 * If we return 0, is it guaranteed that (at least) nb_want bytes are
2193 * available (from this read and/or a previous one). Otherwise, an error code
2194 * is returned (possibly EOF or WANT_READ).
2195 *
2196 * With stream transport (TLS) on success ssl->in_left == nb_want, but
2197 * with datagram transport (DTLS) on success ssl->in_left >= nb_want,
2198 * since we always read a whole datagram at once.
2199 *
2200 * For DTLS, it is up to the caller to set ssl->next_record_offset when
2201 * they're done reading a record.
2202 */
mbedtls_ssl_fetch_input(mbedtls_ssl_context * ssl,size_t nb_want)2203 int mbedtls_ssl_fetch_input( mbedtls_ssl_context *ssl, size_t nb_want )
2204 {
2205 int ret;
2206 size_t len;
2207
2208 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> fetch input" ) );
2209
2210 if( ssl->f_recv == NULL && ssl->f_recv_timeout == NULL )
2211 {
2212 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
2213 "or mbedtls_ssl_set_bio()" ) );
2214 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2215 }
2216
2217 if( nb_want > MBEDTLS_SSL_BUFFER_LEN - (size_t)( ssl->in_hdr - ssl->in_buf ) )
2218 {
2219 MBEDTLS_SSL_DEBUG_MSG( 1, ( "requesting more data than fits" ) );
2220 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2221 }
2222
2223 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2224 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
2225 {
2226 uint32_t timeout;
2227
2228 /* Just to be sure */
2229 if( ssl->f_set_timer == NULL || ssl->f_get_timer == NULL )
2230 {
2231 MBEDTLS_SSL_DEBUG_MSG( 1, ( "You must use "
2232 "mbedtls_ssl_set_timer_cb() for DTLS" ) );
2233 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2234 }
2235
2236 /*
2237 * The point is, we need to always read a full datagram at once, so we
2238 * sometimes read more then requested, and handle the additional data.
2239 * It could be the rest of the current record (while fetching the
2240 * header) and/or some other records in the same datagram.
2241 */
2242
2243 /*
2244 * Move to the next record in the already read datagram if applicable
2245 */
2246 if( ssl->next_record_offset != 0 )
2247 {
2248 if( ssl->in_left < ssl->next_record_offset )
2249 {
2250 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2251 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2252 }
2253
2254 ssl->in_left -= ssl->next_record_offset;
2255
2256 if( ssl->in_left != 0 )
2257 {
2258 MBEDTLS_SSL_DEBUG_MSG( 2, ( "next record in same datagram, offset: %d",
2259 ssl->next_record_offset ) );
2260 memmove( ssl->in_hdr,
2261 ssl->in_hdr + ssl->next_record_offset,
2262 ssl->in_left );
2263 }
2264
2265 ssl->next_record_offset = 0;
2266 }
2267
2268 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
2269 ssl->in_left, nb_want ) );
2270
2271 /*
2272 * Done if we already have enough data.
2273 */
2274 if( nb_want <= ssl->in_left)
2275 {
2276 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
2277 return( 0 );
2278 }
2279
2280 /*
2281 * A record can't be split accross datagrams. If we need to read but
2282 * are not at the beginning of a new record, the caller did something
2283 * wrong.
2284 */
2285 if( ssl->in_left != 0 )
2286 {
2287 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2288 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2289 }
2290
2291 /*
2292 * Don't even try to read if time's out already.
2293 * This avoids by-passing the timer when repeatedly receiving messages
2294 * that will end up being dropped.
2295 */
2296 if( ssl_check_timer( ssl ) != 0 )
2297 ret = MBEDTLS_ERR_SSL_TIMEOUT;
2298 else
2299 {
2300 len = MBEDTLS_SSL_BUFFER_LEN - ( ssl->in_hdr - ssl->in_buf );
2301
2302 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
2303 timeout = ssl->handshake->retransmit_timeout;
2304 else
2305 timeout = ssl->conf->read_timeout;
2306
2307 MBEDTLS_SSL_DEBUG_MSG( 3, ( "f_recv_timeout: %u ms", timeout ) );
2308
2309 if( ssl->f_recv_timeout != NULL )
2310 ret = ssl->f_recv_timeout( ssl->p_bio, ssl->in_hdr, len,
2311 timeout );
2312 else
2313 ret = ssl->f_recv( ssl->p_bio, ssl->in_hdr, len );
2314
2315 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
2316
2317 if( ret == 0 )
2318 return( MBEDTLS_ERR_SSL_CONN_EOF );
2319 }
2320
2321 if( ret == MBEDTLS_ERR_SSL_TIMEOUT )
2322 {
2323 MBEDTLS_SSL_DEBUG_MSG( 2, ( "timeout" ) );
2324 ssl_set_timer( ssl, 0 );
2325
2326 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
2327 {
2328 if( ssl_double_retransmit_timeout( ssl ) != 0 )
2329 {
2330 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake timeout" ) );
2331 return( MBEDTLS_ERR_SSL_TIMEOUT );
2332 }
2333
2334 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
2335 {
2336 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
2337 return( ret );
2338 }
2339
2340 return( MBEDTLS_ERR_SSL_WANT_READ );
2341 }
2342 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
2343 else if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
2344 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
2345 {
2346 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
2347 {
2348 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
2349 return( ret );
2350 }
2351
2352 return( MBEDTLS_ERR_SSL_WANT_READ );
2353 }
2354 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
2355 }
2356
2357 if( ret < 0 )
2358 return( ret );
2359
2360 ssl->in_left = ret;
2361 }
2362 else
2363 #endif
2364 {
2365 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
2366 ssl->in_left, nb_want ) );
2367
2368 while( ssl->in_left < nb_want )
2369 {
2370 len = nb_want - ssl->in_left;
2371
2372 if( ssl_check_timer( ssl ) != 0 )
2373 ret = MBEDTLS_ERR_SSL_TIMEOUT;
2374 else
2375 {
2376 if( ssl->f_recv_timeout != NULL )
2377 {
2378 ret = ssl->f_recv_timeout( ssl->p_bio,
2379 ssl->in_hdr + ssl->in_left, len,
2380 ssl->conf->read_timeout );
2381 }
2382 else
2383 {
2384 ret = ssl->f_recv( ssl->p_bio,
2385 ssl->in_hdr + ssl->in_left, len );
2386 }
2387 }
2388
2389 MBEDTLS_SSL_DEBUG_MSG( 2, ( "in_left: %d, nb_want: %d",
2390 ssl->in_left, nb_want ) );
2391 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_recv(_timeout)", ret );
2392
2393 if( ret == 0 )
2394 return( MBEDTLS_ERR_SSL_CONN_EOF );
2395
2396 if( ret < 0 )
2397 return( ret );
2398
2399 ssl->in_left += ret;
2400 }
2401 }
2402
2403 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= fetch input" ) );
2404
2405 return( 0 );
2406 }
2407
2408 /*
2409 * Flush any data not yet written
2410 */
mbedtls_ssl_flush_output(mbedtls_ssl_context * ssl)2411 int mbedtls_ssl_flush_output( mbedtls_ssl_context *ssl )
2412 {
2413 int ret;
2414 unsigned char *buf, i;
2415
2416 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> flush output" ) );
2417
2418 if( ssl->f_send == NULL )
2419 {
2420 MBEDTLS_SSL_DEBUG_MSG( 1, ( "Bad usage of mbedtls_ssl_set_bio() "
2421 "or mbedtls_ssl_set_bio()" ) );
2422 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
2423 }
2424
2425 /* Avoid incrementing counter if data is flushed */
2426 if( ssl->out_left == 0 )
2427 {
2428 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
2429 return( 0 );
2430 }
2431
2432 while( ssl->out_left > 0 )
2433 {
2434 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message length: %d, out_left: %d",
2435 mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen, ssl->out_left ) );
2436
2437 buf = ssl->out_hdr + mbedtls_ssl_hdr_len( ssl ) +
2438 ssl->out_msglen - ssl->out_left;
2439 ret = ssl->f_send( ssl->p_bio, buf, ssl->out_left );
2440
2441 MBEDTLS_SSL_DEBUG_RET( 2, "ssl->f_send", ret );
2442
2443 if( ret <= 0 )
2444 return( ret );
2445
2446 ssl->out_left -= ret;
2447 }
2448
2449 for( i = 8; i > ssl_ep_len( ssl ); i-- )
2450 if( ++ssl->out_ctr[i - 1] != 0 )
2451 break;
2452
2453 /* The loop goes to its end iff the counter is wrapping */
2454 if( i == ssl_ep_len( ssl ) )
2455 {
2456 MBEDTLS_SSL_DEBUG_MSG( 1, ( "outgoing message counter would wrap" ) );
2457 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
2458 }
2459
2460 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= flush output" ) );
2461
2462 return( 0 );
2463 }
2464
2465 /*
2466 * Functions to handle the DTLS retransmission state machine
2467 */
2468 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2469 /*
2470 * Append current handshake message to current outgoing flight
2471 */
ssl_flight_append(mbedtls_ssl_context * ssl)2472 static int ssl_flight_append( mbedtls_ssl_context *ssl )
2473 {
2474 mbedtls_ssl_flight_item *msg;
2475
2476 /* Allocate space for current message */
2477 if( ( msg = mbedtls_calloc( 1, sizeof( mbedtls_ssl_flight_item ) ) ) == NULL )
2478 {
2479 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed",
2480 sizeof( mbedtls_ssl_flight_item ) ) );
2481 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
2482 }
2483
2484 if( ( msg->p = mbedtls_calloc( 1, ssl->out_msglen ) ) == NULL )
2485 {
2486 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc %d bytes failed", ssl->out_msglen ) );
2487 mbedtls_free( msg );
2488 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
2489 }
2490
2491 /* Copy current handshake message with headers */
2492 memcpy( msg->p, ssl->out_msg, ssl->out_msglen );
2493 msg->len = ssl->out_msglen;
2494 msg->type = ssl->out_msgtype;
2495 msg->next = NULL;
2496
2497 /* Append to the current flight */
2498 if( ssl->handshake->flight == NULL )
2499 ssl->handshake->flight = msg;
2500 else
2501 {
2502 mbedtls_ssl_flight_item *cur = ssl->handshake->flight;
2503 while( cur->next != NULL )
2504 cur = cur->next;
2505 cur->next = msg;
2506 }
2507
2508 return( 0 );
2509 }
2510
2511 /*
2512 * Free the current flight of handshake messages
2513 */
ssl_flight_free(mbedtls_ssl_flight_item * flight)2514 static void ssl_flight_free( mbedtls_ssl_flight_item *flight )
2515 {
2516 mbedtls_ssl_flight_item *cur = flight;
2517 mbedtls_ssl_flight_item *next;
2518
2519 while( cur != NULL )
2520 {
2521 next = cur->next;
2522
2523 mbedtls_free( cur->p );
2524 mbedtls_free( cur );
2525
2526 cur = next;
2527 }
2528 }
2529
2530 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
2531 static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl );
2532 #endif
2533
2534 /*
2535 * Swap transform_out and out_ctr with the alternative ones
2536 */
ssl_swap_epochs(mbedtls_ssl_context * ssl)2537 static void ssl_swap_epochs( mbedtls_ssl_context *ssl )
2538 {
2539 mbedtls_ssl_transform *tmp_transform;
2540 unsigned char tmp_out_ctr[8];
2541
2542 if( ssl->transform_out == ssl->handshake->alt_transform_out )
2543 {
2544 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip swap epochs" ) );
2545 return;
2546 }
2547
2548 MBEDTLS_SSL_DEBUG_MSG( 3, ( "swap epochs" ) );
2549
2550 /* Swap transforms */
2551 tmp_transform = ssl->transform_out;
2552 ssl->transform_out = ssl->handshake->alt_transform_out;
2553 ssl->handshake->alt_transform_out = tmp_transform;
2554
2555 /* Swap epoch + sequence_number */
2556 memcpy( tmp_out_ctr, ssl->out_ctr, 8 );
2557 memcpy( ssl->out_ctr, ssl->handshake->alt_out_ctr, 8 );
2558 memcpy( ssl->handshake->alt_out_ctr, tmp_out_ctr, 8 );
2559
2560 /* Adjust to the newly activated transform */
2561 if( ssl->transform_out != NULL &&
2562 ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
2563 {
2564 ssl->out_msg = ssl->out_iv + ssl->transform_out->ivlen -
2565 ssl->transform_out->fixed_ivlen;
2566 }
2567 else
2568 ssl->out_msg = ssl->out_iv;
2569
2570 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2571 if( mbedtls_ssl_hw_record_activate != NULL )
2572 {
2573 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
2574 {
2575 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
2576 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
2577 }
2578 }
2579 #endif
2580 }
2581
2582 /*
2583 * Retransmit the current flight of messages.
2584 *
2585 * Need to remember the current message in case flush_output returns
2586 * WANT_WRITE, causing us to exit this function and come back later.
2587 * This function must be called until state is no longer SENDING.
2588 */
mbedtls_ssl_resend(mbedtls_ssl_context * ssl)2589 int mbedtls_ssl_resend( mbedtls_ssl_context *ssl )
2590 {
2591 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> mbedtls_ssl_resend" ) );
2592
2593 if( ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING )
2594 {
2595 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialise resending" ) );
2596
2597 ssl->handshake->cur_msg = ssl->handshake->flight;
2598 ssl_swap_epochs( ssl );
2599
2600 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_SENDING;
2601 }
2602
2603 while( ssl->handshake->cur_msg != NULL )
2604 {
2605 int ret;
2606 mbedtls_ssl_flight_item *cur = ssl->handshake->cur_msg;
2607
2608 /* Swap epochs before sending Finished: we can't do it after
2609 * sending ChangeCipherSpec, in case write returns WANT_READ.
2610 * Must be done before copying, may change out_msg pointer */
2611 if( cur->type == MBEDTLS_SSL_MSG_HANDSHAKE &&
2612 cur->p[0] == MBEDTLS_SSL_HS_FINISHED )
2613 {
2614 ssl_swap_epochs( ssl );
2615 }
2616
2617 memcpy( ssl->out_msg, cur->p, cur->len );
2618 ssl->out_msglen = cur->len;
2619 ssl->out_msgtype = cur->type;
2620
2621 ssl->handshake->cur_msg = cur->next;
2622
2623 MBEDTLS_SSL_DEBUG_BUF( 3, "resent handshake message header", ssl->out_msg, 12 );
2624
2625 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
2626 {
2627 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
2628 return( ret );
2629 }
2630 }
2631
2632 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
2633 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
2634 else
2635 {
2636 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
2637 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
2638 }
2639
2640 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= mbedtls_ssl_resend" ) );
2641
2642 return( 0 );
2643 }
2644
2645 /*
2646 * To be called when the last message of an incoming flight is received.
2647 */
mbedtls_ssl_recv_flight_completed(mbedtls_ssl_context * ssl)2648 void mbedtls_ssl_recv_flight_completed( mbedtls_ssl_context *ssl )
2649 {
2650 /* We won't need to resend that one any more */
2651 ssl_flight_free( ssl->handshake->flight );
2652 ssl->handshake->flight = NULL;
2653 ssl->handshake->cur_msg = NULL;
2654
2655 /* The next incoming flight will start with this msg_seq */
2656 ssl->handshake->in_flight_start_seq = ssl->handshake->in_msg_seq;
2657
2658 /* Cancel timer */
2659 ssl_set_timer( ssl, 0 );
2660
2661 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2662 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
2663 {
2664 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
2665 }
2666 else
2667 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
2668 }
2669
2670 /*
2671 * To be called when the last message of an outgoing flight is send.
2672 */
mbedtls_ssl_send_flight_completed(mbedtls_ssl_context * ssl)2673 void mbedtls_ssl_send_flight_completed( mbedtls_ssl_context *ssl )
2674 {
2675 ssl_reset_retransmit_timeout( ssl );
2676 ssl_set_timer( ssl, ssl->handshake->retransmit_timeout );
2677
2678 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
2679 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
2680 {
2681 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_FINISHED;
2682 }
2683 else
2684 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
2685 }
2686 #endif /* MBEDTLS_SSL_PROTO_DTLS */
2687
2688 /*
2689 * Record layer functions
2690 */
2691
2692 /*
2693 * Write current record.
2694 * Uses ssl->out_msgtype, ssl->out_msglen and bytes at ssl->out_msg.
2695 */
mbedtls_ssl_write_record(mbedtls_ssl_context * ssl)2696 int mbedtls_ssl_write_record( mbedtls_ssl_context *ssl )
2697 {
2698 int ret, done = 0, out_msg_type;
2699 size_t len = ssl->out_msglen;
2700
2701 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write record" ) );
2702
2703 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2704 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
2705 ssl->handshake != NULL &&
2706 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
2707 {
2708 ; /* Skip special handshake treatment when resending */
2709 }
2710 else
2711 #endif
2712 if( ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
2713 {
2714 out_msg_type = ssl->out_msg[0];
2715
2716 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST &&
2717 ssl->handshake == NULL )
2718 {
2719 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
2720 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
2721 }
2722
2723 ssl->out_msg[1] = (unsigned char)( ( len - 4 ) >> 16 );
2724 ssl->out_msg[2] = (unsigned char)( ( len - 4 ) >> 8 );
2725 ssl->out_msg[3] = (unsigned char)( ( len - 4 ) );
2726
2727 /*
2728 * DTLS has additional fields in the Handshake layer,
2729 * between the length field and the actual payload:
2730 * uint16 message_seq;
2731 * uint24 fragment_offset;
2732 * uint24 fragment_length;
2733 */
2734 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2735 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
2736 {
2737 /* Make room for the additional DTLS fields */
2738 memmove( ssl->out_msg + 12, ssl->out_msg + 4, len - 4 );
2739 ssl->out_msglen += 8;
2740 len += 8;
2741
2742 /* Write message_seq and update it, except for HelloRequest */
2743 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
2744 {
2745 ssl->out_msg[4] = ( ssl->handshake->out_msg_seq >> 8 ) & 0xFF;
2746 ssl->out_msg[5] = ( ssl->handshake->out_msg_seq ) & 0xFF;
2747 ++( ssl->handshake->out_msg_seq );
2748 }
2749 else
2750 {
2751 ssl->out_msg[4] = 0;
2752 ssl->out_msg[5] = 0;
2753 }
2754
2755 /* We don't fragment, so frag_offset = 0 and frag_len = len */
2756 memset( ssl->out_msg + 6, 0x00, 3 );
2757 memcpy( ssl->out_msg + 9, ssl->out_msg + 1, 3 );
2758 }
2759 #endif /* MBEDTLS_SSL_PROTO_DTLS */
2760
2761 if( out_msg_type != MBEDTLS_SSL_HS_HELLO_REQUEST )
2762 ssl->handshake->update_checksum( ssl, ssl->out_msg, len );
2763 }
2764
2765 /* Save handshake and CCS messages for resending */
2766 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2767 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
2768 ssl->handshake != NULL &&
2769 ssl->handshake->retransmit_state != MBEDTLS_SSL_RETRANS_SENDING &&
2770 ( ssl->out_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC ||
2771 ssl->out_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE ) )
2772 {
2773 if( ( ret = ssl_flight_append( ssl ) ) != 0 )
2774 {
2775 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_flight_append", ret );
2776 return( ret );
2777 }
2778 }
2779 #endif
2780
2781 #if defined(MBEDTLS_ZLIB_SUPPORT)
2782 if( ssl->transform_out != NULL &&
2783 ssl->session_out->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
2784 {
2785 if( ( ret = ssl_compress_buf( ssl ) ) != 0 )
2786 {
2787 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_compress_buf", ret );
2788 return( ret );
2789 }
2790
2791 len = ssl->out_msglen;
2792 }
2793 #endif /*MBEDTLS_ZLIB_SUPPORT */
2794
2795 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
2796 if( mbedtls_ssl_hw_record_write != NULL )
2797 {
2798 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_write()" ) );
2799
2800 ret = mbedtls_ssl_hw_record_write( ssl );
2801 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
2802 {
2803 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_write", ret );
2804 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
2805 }
2806
2807 if( ret == 0 )
2808 done = 1;
2809 }
2810 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
2811 if( !done )
2812 {
2813 ssl->out_hdr[0] = (unsigned char) ssl->out_msgtype;
2814 mbedtls_ssl_write_version( ssl->major_ver, ssl->minor_ver,
2815 ssl->conf->transport, ssl->out_hdr + 1 );
2816
2817 ssl->out_len[0] = (unsigned char)( len >> 8 );
2818 ssl->out_len[1] = (unsigned char)( len );
2819
2820 if( ssl->transform_out != NULL )
2821 {
2822 if( ( ret = ssl_encrypt_buf( ssl ) ) != 0 )
2823 {
2824 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_encrypt_buf", ret );
2825 return( ret );
2826 }
2827
2828 len = ssl->out_msglen;
2829 ssl->out_len[0] = (unsigned char)( len >> 8 );
2830 ssl->out_len[1] = (unsigned char)( len );
2831 }
2832
2833 ssl->out_left = mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen;
2834
2835 MBEDTLS_SSL_DEBUG_MSG( 3, ( "output record: msgtype = %d, "
2836 "version = [%d:%d], msglen = %d",
2837 ssl->out_hdr[0], ssl->out_hdr[1], ssl->out_hdr[2],
2838 ( ssl->out_len[0] << 8 ) | ssl->out_len[1] ) );
2839
2840 MBEDTLS_SSL_DEBUG_BUF( 4, "output record sent to network",
2841 ssl->out_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->out_msglen );
2842 }
2843
2844 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
2845 {
2846 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
2847 return( ret );
2848 }
2849
2850 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write record" ) );
2851
2852 return( 0 );
2853 }
2854
2855 #if defined(MBEDTLS_SSL_PROTO_DTLS)
2856 /*
2857 * Mark bits in bitmask (used for DTLS HS reassembly)
2858 */
ssl_bitmask_set(unsigned char * mask,size_t offset,size_t len)2859 static void ssl_bitmask_set( unsigned char *mask, size_t offset, size_t len )
2860 {
2861 unsigned int start_bits, end_bits;
2862
2863 start_bits = 8 - ( offset % 8 );
2864 if( start_bits != 8 )
2865 {
2866 size_t first_byte_idx = offset / 8;
2867
2868 /* Special case */
2869 if( len <= start_bits )
2870 {
2871 for( ; len != 0; len-- )
2872 mask[first_byte_idx] |= 1 << ( start_bits - len );
2873
2874 /* Avoid potential issues with offset or len becoming invalid */
2875 return;
2876 }
2877
2878 offset += start_bits; /* Now offset % 8 == 0 */
2879 len -= start_bits;
2880
2881 for( ; start_bits != 0; start_bits-- )
2882 mask[first_byte_idx] |= 1 << ( start_bits - 1 );
2883 }
2884
2885 end_bits = len % 8;
2886 if( end_bits != 0 )
2887 {
2888 size_t last_byte_idx = ( offset + len ) / 8;
2889
2890 len -= end_bits; /* Now len % 8 == 0 */
2891
2892 for( ; end_bits != 0; end_bits-- )
2893 mask[last_byte_idx] |= 1 << ( 8 - end_bits );
2894 }
2895
2896 memset( mask + offset / 8, 0xFF, len / 8 );
2897 }
2898
2899 /*
2900 * Check that bitmask is full
2901 */
ssl_bitmask_check(unsigned char * mask,size_t len)2902 static int ssl_bitmask_check( unsigned char *mask, size_t len )
2903 {
2904 size_t i;
2905
2906 for( i = 0; i < len / 8; i++ )
2907 if( mask[i] != 0xFF )
2908 return( -1 );
2909
2910 for( i = 0; i < len % 8; i++ )
2911 if( ( mask[len / 8] & ( 1 << ( 7 - i ) ) ) == 0 )
2912 return( -1 );
2913
2914 return( 0 );
2915 }
2916
2917 /*
2918 * Reassemble fragmented DTLS handshake messages.
2919 *
2920 * Use a temporary buffer for reassembly, divided in two parts:
2921 * - the first holds the reassembled message (including handshake header),
2922 * - the second holds a bitmask indicating which parts of the message
2923 * (excluding headers) have been received so far.
2924 */
ssl_reassemble_dtls_handshake(mbedtls_ssl_context * ssl)2925 static int ssl_reassemble_dtls_handshake( mbedtls_ssl_context *ssl )
2926 {
2927 unsigned char *msg, *bitmask;
2928 size_t frag_len, frag_off;
2929 size_t msg_len = ssl->in_hslen - 12; /* Without headers */
2930
2931 if( ssl->handshake == NULL )
2932 {
2933 MBEDTLS_SSL_DEBUG_MSG( 1, ( "not supported outside handshake (for now)" ) );
2934 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
2935 }
2936
2937 /*
2938 * For first fragment, check size and allocate buffer
2939 */
2940 if( ssl->handshake->hs_msg == NULL )
2941 {
2942 size_t alloc_len;
2943
2944 MBEDTLS_SSL_DEBUG_MSG( 2, ( "initialize reassembly, total length = %d",
2945 msg_len ) );
2946
2947 if( ssl->in_hslen > MBEDTLS_SSL_MAX_CONTENT_LEN )
2948 {
2949 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too large" ) );
2950 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
2951 }
2952
2953 /* The bitmask needs one bit per byte of message excluding header */
2954 alloc_len = 12 + msg_len + msg_len / 8 + ( msg_len % 8 != 0 );
2955
2956 ssl->handshake->hs_msg = mbedtls_calloc( 1, alloc_len );
2957 if( ssl->handshake->hs_msg == NULL )
2958 {
2959 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc failed (%d bytes)", alloc_len ) );
2960 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
2961 }
2962
2963 /* Prepare final header: copy msg_type, length and message_seq,
2964 * then add standardised fragment_offset and fragment_length */
2965 memcpy( ssl->handshake->hs_msg, ssl->in_msg, 6 );
2966 memset( ssl->handshake->hs_msg + 6, 0, 3 );
2967 memcpy( ssl->handshake->hs_msg + 9,
2968 ssl->handshake->hs_msg + 1, 3 );
2969 }
2970 else
2971 {
2972 /* Make sure msg_type and length are consistent */
2973 if( memcmp( ssl->handshake->hs_msg, ssl->in_msg, 4 ) != 0 )
2974 {
2975 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment header mismatch" ) );
2976 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
2977 }
2978 }
2979
2980 msg = ssl->handshake->hs_msg + 12;
2981 bitmask = msg + msg_len;
2982
2983 /*
2984 * Check and copy current fragment
2985 */
2986 frag_off = ( ssl->in_msg[6] << 16 ) |
2987 ( ssl->in_msg[7] << 8 ) |
2988 ssl->in_msg[8];
2989 frag_len = ( ssl->in_msg[9] << 16 ) |
2990 ( ssl->in_msg[10] << 8 ) |
2991 ssl->in_msg[11];
2992
2993 if( frag_off + frag_len > msg_len )
2994 {
2995 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment offset/len: %d + %d > %d",
2996 frag_off, frag_len, msg_len ) );
2997 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
2998 }
2999
3000 if( frag_len + 12 > ssl->in_msglen )
3001 {
3002 MBEDTLS_SSL_DEBUG_MSG( 1, ( "invalid fragment length: %d + 12 > %d",
3003 frag_len, ssl->in_msglen ) );
3004 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3005 }
3006
3007 MBEDTLS_SSL_DEBUG_MSG( 2, ( "adding fragment, offset = %d, length = %d",
3008 frag_off, frag_len ) );
3009
3010 memcpy( msg + frag_off, ssl->in_msg + 12, frag_len );
3011 ssl_bitmask_set( bitmask, frag_off, frag_len );
3012
3013 /*
3014 * Do we have the complete message by now?
3015 * If yes, finalize it, else ask to read the next record.
3016 */
3017 if( ssl_bitmask_check( bitmask, msg_len ) != 0 )
3018 {
3019 MBEDTLS_SSL_DEBUG_MSG( 2, ( "message is not complete yet" ) );
3020 return( MBEDTLS_ERR_SSL_WANT_READ );
3021 }
3022
3023 MBEDTLS_SSL_DEBUG_MSG( 2, ( "handshake message completed" ) );
3024
3025 if( frag_len + 12 < ssl->in_msglen )
3026 {
3027 /*
3028 * We'got more handshake messages in the same record.
3029 * This case is not handled now because no know implementation does
3030 * that and it's hard to test, so we prefer to fail cleanly for now.
3031 */
3032 MBEDTLS_SSL_DEBUG_MSG( 1, ( "last fragment not alone in its record" ) );
3033 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
3034 }
3035
3036 if( ssl->in_left > ssl->next_record_offset )
3037 {
3038 /*
3039 * We've got more data in the buffer after the current record,
3040 * that we don't want to overwrite. Move it before writing the
3041 * reassembled message, and adjust in_left and next_record_offset.
3042 */
3043 unsigned char *cur_remain = ssl->in_hdr + ssl->next_record_offset;
3044 unsigned char *new_remain = ssl->in_msg + ssl->in_hslen;
3045 size_t remain_len = ssl->in_left - ssl->next_record_offset;
3046
3047 /* First compute and check new lengths */
3048 ssl->next_record_offset = new_remain - ssl->in_hdr;
3049 ssl->in_left = ssl->next_record_offset + remain_len;
3050
3051 if( ssl->in_left > MBEDTLS_SSL_BUFFER_LEN -
3052 (size_t)( ssl->in_hdr - ssl->in_buf ) )
3053 {
3054 MBEDTLS_SSL_DEBUG_MSG( 1, ( "reassembled message too large for buffer" ) );
3055 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
3056 }
3057
3058 memmove( new_remain, cur_remain, remain_len );
3059 }
3060
3061 memcpy( ssl->in_msg, ssl->handshake->hs_msg, ssl->in_hslen );
3062
3063 mbedtls_free( ssl->handshake->hs_msg );
3064 ssl->handshake->hs_msg = NULL;
3065
3066 MBEDTLS_SSL_DEBUG_BUF( 3, "reassembled handshake message",
3067 ssl->in_msg, ssl->in_hslen );
3068
3069 return( 0 );
3070 }
3071 #endif /* MBEDTLS_SSL_PROTO_DTLS */
3072
mbedtls_ssl_prepare_handshake_record(mbedtls_ssl_context * ssl)3073 int mbedtls_ssl_prepare_handshake_record( mbedtls_ssl_context *ssl )
3074 {
3075 if( ssl->in_msglen < mbedtls_ssl_hs_hdr_len( ssl ) )
3076 {
3077 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake message too short: %d",
3078 ssl->in_msglen ) );
3079 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3080 }
3081
3082 ssl->in_hslen = mbedtls_ssl_hs_hdr_len( ssl ) + (
3083 ( ssl->in_msg[1] << 16 ) |
3084 ( ssl->in_msg[2] << 8 ) |
3085 ssl->in_msg[3] );
3086
3087 MBEDTLS_SSL_DEBUG_MSG( 3, ( "handshake message: msglen ="
3088 " %d, type = %d, hslen = %d",
3089 ssl->in_msglen, ssl->in_msg[0], ssl->in_hslen ) );
3090
3091 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3092 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3093 {
3094 int ret;
3095 unsigned int recv_msg_seq = ( ssl->in_msg[4] << 8 ) | ssl->in_msg[5];
3096
3097 /* ssl->handshake is NULL when receiving ClientHello for renego */
3098 if( ssl->handshake != NULL &&
3099 recv_msg_seq != ssl->handshake->in_msg_seq )
3100 {
3101 /* Retransmit only on last message from previous flight, to avoid
3102 * too many retransmissions.
3103 * Besides, No sane server ever retransmits HelloVerifyRequest */
3104 if( recv_msg_seq == ssl->handshake->in_flight_start_seq - 1 &&
3105 ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST )
3106 {
3107 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received message from last flight, "
3108 "message_seq = %d, start_of_flight = %d",
3109 recv_msg_seq,
3110 ssl->handshake->in_flight_start_seq ) );
3111
3112 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
3113 {
3114 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
3115 return( ret );
3116 }
3117 }
3118 else
3119 {
3120 MBEDTLS_SSL_DEBUG_MSG( 2, ( "dropping out-of-sequence message: "
3121 "message_seq = %d, expected = %d",
3122 recv_msg_seq,
3123 ssl->handshake->in_msg_seq ) );
3124 }
3125
3126 return( MBEDTLS_ERR_SSL_WANT_READ );
3127 }
3128 /* Wait until message completion to increment in_msg_seq */
3129
3130 /* Reassemble if current message is fragmented or reassembly is
3131 * already in progress */
3132 if( ssl->in_msglen < ssl->in_hslen ||
3133 memcmp( ssl->in_msg + 6, "\0\0\0", 3 ) != 0 ||
3134 memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 ||
3135 ( ssl->handshake != NULL && ssl->handshake->hs_msg != NULL ) )
3136 {
3137 MBEDTLS_SSL_DEBUG_MSG( 2, ( "found fragmented DTLS handshake message" ) );
3138
3139 if( ( ret = ssl_reassemble_dtls_handshake( ssl ) ) != 0 )
3140 {
3141 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_reassemble_dtls_handshake", ret );
3142 return( ret );
3143 }
3144 }
3145 }
3146 else
3147 #endif /* MBEDTLS_SSL_PROTO_DTLS */
3148 /* With TLS we don't handle fragmentation (for now) */
3149 if( ssl->in_msglen < ssl->in_hslen )
3150 {
3151 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLS handshake fragmentation not supported" ) );
3152 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
3153 }
3154
3155 return( 0 );
3156 }
3157
mbedtls_ssl_update_handshake_status(mbedtls_ssl_context * ssl)3158 void mbedtls_ssl_update_handshake_status( mbedtls_ssl_context *ssl )
3159 {
3160
3161 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER &&
3162 ssl->handshake != NULL )
3163 {
3164 ssl->handshake->update_checksum( ssl, ssl->in_msg, ssl->in_hslen );
3165 }
3166
3167 /* Handshake message is complete, increment counter */
3168 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3169 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3170 ssl->handshake != NULL )
3171 {
3172 ssl->handshake->in_msg_seq++;
3173 }
3174 #endif
3175 }
3176
3177 /*
3178 * DTLS anti-replay: RFC 6347 4.1.2.6
3179 *
3180 * in_window is a field of bits numbered from 0 (lsb) to 63 (msb).
3181 * Bit n is set iff record number in_window_top - n has been seen.
3182 *
3183 * Usually, in_window_top is the last record number seen and the lsb of
3184 * in_window is set. The only exception is the initial state (record number 0
3185 * not seen yet).
3186 */
3187 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
ssl_dtls_replay_reset(mbedtls_ssl_context * ssl)3188 static void ssl_dtls_replay_reset( mbedtls_ssl_context *ssl )
3189 {
3190 ssl->in_window_top = 0;
3191 ssl->in_window = 0;
3192 }
3193
ssl_load_six_bytes(unsigned char * buf)3194 static inline uint64_t ssl_load_six_bytes( unsigned char *buf )
3195 {
3196 return( ( (uint64_t) buf[0] << 40 ) |
3197 ( (uint64_t) buf[1] << 32 ) |
3198 ( (uint64_t) buf[2] << 24 ) |
3199 ( (uint64_t) buf[3] << 16 ) |
3200 ( (uint64_t) buf[4] << 8 ) |
3201 ( (uint64_t) buf[5] ) );
3202 }
3203
3204 /*
3205 * Return 0 if sequence number is acceptable, -1 otherwise
3206 */
mbedtls_ssl_dtls_replay_check(mbedtls_ssl_context * ssl)3207 int mbedtls_ssl_dtls_replay_check( mbedtls_ssl_context *ssl )
3208 {
3209 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3210 uint64_t bit;
3211
3212 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
3213 return( 0 );
3214
3215 if( rec_seqnum > ssl->in_window_top )
3216 return( 0 );
3217
3218 bit = ssl->in_window_top - rec_seqnum;
3219
3220 if( bit >= 64 )
3221 return( -1 );
3222
3223 if( ( ssl->in_window & ( (uint64_t) 1 << bit ) ) != 0 )
3224 return( -1 );
3225
3226 return( 0 );
3227 }
3228
3229 /*
3230 * Update replay window on new validated record
3231 */
mbedtls_ssl_dtls_replay_update(mbedtls_ssl_context * ssl)3232 void mbedtls_ssl_dtls_replay_update( mbedtls_ssl_context *ssl )
3233 {
3234 uint64_t rec_seqnum = ssl_load_six_bytes( ssl->in_ctr + 2 );
3235
3236 if( ssl->conf->anti_replay == MBEDTLS_SSL_ANTI_REPLAY_DISABLED )
3237 return;
3238
3239 if( rec_seqnum > ssl->in_window_top )
3240 {
3241 /* Update window_top and the contents of the window */
3242 uint64_t shift = rec_seqnum - ssl->in_window_top;
3243
3244 if( shift >= 64 )
3245 ssl->in_window = 1;
3246 else
3247 {
3248 ssl->in_window <<= shift;
3249 ssl->in_window |= 1;
3250 }
3251
3252 ssl->in_window_top = rec_seqnum;
3253 }
3254 else
3255 {
3256 /* Mark that number as seen in the current window */
3257 uint64_t bit = ssl->in_window_top - rec_seqnum;
3258
3259 if( bit < 64 ) /* Always true, but be extra sure */
3260 ssl->in_window |= (uint64_t) 1 << bit;
3261 }
3262 }
3263 #endif /* MBEDTLS_SSL_DTLS_ANTI_REPLAY */
3264
3265 #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
3266 /* Forward declaration */
3267 static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial );
3268
3269 /*
3270 * Without any SSL context, check if a datagram looks like a ClientHello with
3271 * a valid cookie, and if it doesn't, generate a HelloVerifyRequest message.
3272 * Both input and output include full DTLS headers.
3273 *
3274 * - if cookie is valid, return 0
3275 * - if ClientHello looks superficially valid but cookie is not,
3276 * fill obuf and set olen, then
3277 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
3278 * - otherwise return a specific error code
3279 */
ssl_check_dtls_clihlo_cookie(mbedtls_ssl_cookie_write_t * f_cookie_write,mbedtls_ssl_cookie_check_t * f_cookie_check,void * p_cookie,const unsigned char * cli_id,size_t cli_id_len,const unsigned char * in,size_t in_len,unsigned char * obuf,size_t buf_len,size_t * olen)3280 static int ssl_check_dtls_clihlo_cookie(
3281 mbedtls_ssl_cookie_write_t *f_cookie_write,
3282 mbedtls_ssl_cookie_check_t *f_cookie_check,
3283 void *p_cookie,
3284 const unsigned char *cli_id, size_t cli_id_len,
3285 const unsigned char *in, size_t in_len,
3286 unsigned char *obuf, size_t buf_len, size_t *olen )
3287 {
3288 size_t sid_len, cookie_len;
3289 unsigned char *p;
3290
3291 if( f_cookie_write == NULL || f_cookie_check == NULL )
3292 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
3293
3294 /*
3295 * Structure of ClientHello with record and handshake headers,
3296 * and expected values. We don't need to check a lot, more checks will be
3297 * done when actually parsing the ClientHello - skipping those checks
3298 * avoids code duplication and does not make cookie forging any easier.
3299 *
3300 * 0-0 ContentType type; copied, must be handshake
3301 * 1-2 ProtocolVersion version; copied
3302 * 3-4 uint16 epoch; copied, must be 0
3303 * 5-10 uint48 sequence_number; copied
3304 * 11-12 uint16 length; (ignored)
3305 *
3306 * 13-13 HandshakeType msg_type; (ignored)
3307 * 14-16 uint24 length; (ignored)
3308 * 17-18 uint16 message_seq; copied
3309 * 19-21 uint24 fragment_offset; copied, must be 0
3310 * 22-24 uint24 fragment_length; (ignored)
3311 *
3312 * 25-26 ProtocolVersion client_version; (ignored)
3313 * 27-58 Random random; (ignored)
3314 * 59-xx SessionID session_id; 1 byte len + sid_len content
3315 * 60+ opaque cookie<0..2^8-1>; 1 byte len + content
3316 * ...
3317 *
3318 * Minimum length is 61 bytes.
3319 */
3320 if( in_len < 61 ||
3321 in[0] != MBEDTLS_SSL_MSG_HANDSHAKE ||
3322 in[3] != 0 || in[4] != 0 ||
3323 in[19] != 0 || in[20] != 0 || in[21] != 0 )
3324 {
3325 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3326 }
3327
3328 sid_len = in[59];
3329 if( sid_len > in_len - 61 )
3330 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3331
3332 cookie_len = in[60 + sid_len];
3333 if( cookie_len > in_len - 60 )
3334 return( MBEDTLS_ERR_SSL_BAD_HS_CLIENT_HELLO );
3335
3336 if( f_cookie_check( p_cookie, in + sid_len + 61, cookie_len,
3337 cli_id, cli_id_len ) == 0 )
3338 {
3339 /* Valid cookie */
3340 return( 0 );
3341 }
3342
3343 /*
3344 * If we get here, we've got an invalid cookie, let's prepare HVR.
3345 *
3346 * 0-0 ContentType type; copied
3347 * 1-2 ProtocolVersion version; copied
3348 * 3-4 uint16 epoch; copied
3349 * 5-10 uint48 sequence_number; copied
3350 * 11-12 uint16 length; olen - 13
3351 *
3352 * 13-13 HandshakeType msg_type; hello_verify_request
3353 * 14-16 uint24 length; olen - 25
3354 * 17-18 uint16 message_seq; copied
3355 * 19-21 uint24 fragment_offset; copied
3356 * 22-24 uint24 fragment_length; olen - 25
3357 *
3358 * 25-26 ProtocolVersion server_version; 0xfe 0xff
3359 * 27-27 opaque cookie<0..2^8-1>; cookie_len = olen - 27, cookie
3360 *
3361 * Minimum length is 28.
3362 */
3363 if( buf_len < 28 )
3364 return( MBEDTLS_ERR_SSL_BUFFER_TOO_SMALL );
3365
3366 /* Copy most fields and adapt others */
3367 memcpy( obuf, in, 25 );
3368 obuf[13] = MBEDTLS_SSL_HS_HELLO_VERIFY_REQUEST;
3369 obuf[25] = 0xfe;
3370 obuf[26] = 0xff;
3371
3372 /* Generate and write actual cookie */
3373 p = obuf + 28;
3374 if( f_cookie_write( p_cookie,
3375 &p, obuf + buf_len, cli_id, cli_id_len ) != 0 )
3376 {
3377 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
3378 }
3379
3380 *olen = p - obuf;
3381
3382 /* Go back and fill length fields */
3383 obuf[27] = (unsigned char)( *olen - 28 );
3384
3385 obuf[14] = obuf[22] = (unsigned char)( ( *olen - 25 ) >> 16 );
3386 obuf[15] = obuf[23] = (unsigned char)( ( *olen - 25 ) >> 8 );
3387 obuf[16] = obuf[24] = (unsigned char)( ( *olen - 25 ) );
3388
3389 obuf[11] = (unsigned char)( ( *olen - 13 ) >> 8 );
3390 obuf[12] = (unsigned char)( ( *olen - 13 ) );
3391
3392 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
3393 }
3394
3395 /*
3396 * Handle possible client reconnect with the same UDP quadruplet
3397 * (RFC 6347 Section 4.2.8).
3398 *
3399 * Called by ssl_parse_record_header() in case we receive an epoch 0 record
3400 * that looks like a ClientHello.
3401 *
3402 * - if the input looks like a ClientHello without cookies,
3403 * send back HelloVerifyRequest, then
3404 * return MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED
3405 * - if the input looks like a ClientHello with a valid cookie,
3406 * reset the session of the current context, and
3407 * return MBEDTLS_ERR_SSL_CLIENT_RECONNECT
3408 * - if anything goes wrong, return a specific error code
3409 *
3410 * mbedtls_ssl_read_record() will ignore the record if anything else than
3411 * MBEDTLS_ERR_SSL_CLIENT_RECONNECT or 0 is returned, although this function
3412 * cannot not return 0.
3413 */
ssl_handle_possible_reconnect(mbedtls_ssl_context * ssl)3414 static int ssl_handle_possible_reconnect( mbedtls_ssl_context *ssl )
3415 {
3416 int ret;
3417 size_t len;
3418
3419 ret = ssl_check_dtls_clihlo_cookie(
3420 ssl->conf->f_cookie_write,
3421 ssl->conf->f_cookie_check,
3422 ssl->conf->p_cookie,
3423 ssl->cli_id, ssl->cli_id_len,
3424 ssl->in_buf, ssl->in_left,
3425 ssl->out_buf, MBEDTLS_SSL_MAX_CONTENT_LEN, &len );
3426
3427 MBEDTLS_SSL_DEBUG_RET( 2, "ssl_check_dtls_clihlo_cookie", ret );
3428
3429 if( ret == MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED )
3430 {
3431 /* Dont check write errors as we can't do anything here.
3432 * If the error is permanent we'll catch it later,
3433 * if it's not, then hopefully it'll work next time. */
3434 (void) ssl->f_send( ssl->p_bio, ssl->out_buf, len );
3435
3436 return( MBEDTLS_ERR_SSL_HELLO_VERIFY_REQUIRED );
3437 }
3438
3439 if( ret == 0 )
3440 {
3441 /* Got a valid cookie, partially reset context */
3442 if( ( ret = ssl_session_reset_int( ssl, 1 ) ) != 0 )
3443 {
3444 MBEDTLS_SSL_DEBUG_RET( 1, "reset", ret );
3445 return( ret );
3446 }
3447
3448 return( MBEDTLS_ERR_SSL_CLIENT_RECONNECT );
3449 }
3450
3451 return( ret );
3452 }
3453 #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
3454
3455 /*
3456 * ContentType type;
3457 * ProtocolVersion version;
3458 * uint16 epoch; // DTLS only
3459 * uint48 sequence_number; // DTLS only
3460 * uint16 length;
3461 *
3462 * Return 0 if header looks sane (and, for DTLS, the record is expected)
3463 * MBEDTLS_ERR_SSL_INVALID_RECORD if the header looks bad,
3464 * MBEDTLS_ERR_SSL_UNEXPECTED_RECORD (DTLS only) if sane but unexpected.
3465 *
3466 * With DTLS, mbedtls_ssl_read_record() will:
3467 * 1. proceed with the record if this function returns 0
3468 * 2. drop only the current record if this function returns UNEXPECTED_RECORD
3469 * 3. return CLIENT_RECONNECT if this function return that value
3470 * 4. drop the whole datagram if this function returns anything else.
3471 * Point 2 is needed when the peer is resending, and we have already received
3472 * the first record from a datagram but are still waiting for the others.
3473 */
ssl_parse_record_header(mbedtls_ssl_context * ssl)3474 static int ssl_parse_record_header( mbedtls_ssl_context *ssl )
3475 {
3476 int ret;
3477 int major_ver, minor_ver;
3478
3479 MBEDTLS_SSL_DEBUG_BUF( 4, "input record header", ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) );
3480
3481 ssl->in_msgtype = ssl->in_hdr[0];
3482 ssl->in_msglen = ( ssl->in_len[0] << 8 ) | ssl->in_len[1];
3483 mbedtls_ssl_read_version( &major_ver, &minor_ver, ssl->conf->transport, ssl->in_hdr + 1 );
3484
3485 MBEDTLS_SSL_DEBUG_MSG( 3, ( "input record: msgtype = %d, "
3486 "version = [%d:%d], msglen = %d",
3487 ssl->in_msgtype,
3488 major_ver, minor_ver, ssl->in_msglen ) );
3489
3490 /* Check record type */
3491 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE &&
3492 ssl->in_msgtype != MBEDTLS_SSL_MSG_ALERT &&
3493 ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3494 ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
3495 {
3496 MBEDTLS_SSL_DEBUG_MSG( 1, ( "unknown record type" ) );
3497
3498 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
3499 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3500 MBEDTLS_SSL_ALERT_MSG_UNEXPECTED_MESSAGE ) ) != 0 )
3501 {
3502 return( ret );
3503 }
3504
3505 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3506 }
3507
3508 /* Check version */
3509 if( major_ver != ssl->major_ver )
3510 {
3511 MBEDTLS_SSL_DEBUG_MSG( 1, ( "major version mismatch" ) );
3512 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3513 }
3514
3515 if( minor_ver > ssl->conf->max_minor_ver )
3516 {
3517 MBEDTLS_SSL_DEBUG_MSG( 1, ( "minor version mismatch" ) );
3518 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3519 }
3520
3521 /* Check length against the size of our buffer */
3522 if( ssl->in_msglen > MBEDTLS_SSL_BUFFER_LEN
3523 - (size_t)( ssl->in_msg - ssl->in_buf ) )
3524 {
3525 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3526 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3527 }
3528
3529 /* Check length against bounds of the current transform and version */
3530 if( ssl->transform_in == NULL )
3531 {
3532 if( ssl->in_msglen < 1 ||
3533 ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
3534 {
3535 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3536 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3537 }
3538 }
3539 else
3540 {
3541 if( ssl->in_msglen < ssl->transform_in->minlen )
3542 {
3543 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3544 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3545 }
3546
3547 #if defined(MBEDTLS_SSL_PROTO_SSL3)
3548 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
3549 ssl->in_msglen > ssl->transform_in->minlen + MBEDTLS_SSL_MAX_CONTENT_LEN )
3550 {
3551 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3552 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3553 }
3554 #endif
3555 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
3556 defined(MBEDTLS_SSL_PROTO_TLS1_2)
3557 /*
3558 * TLS encrypted messages can have up to 256 bytes of padding
3559 */
3560 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 &&
3561 ssl->in_msglen > ssl->transform_in->minlen +
3562 MBEDTLS_SSL_MAX_CONTENT_LEN + 256 )
3563 {
3564 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3565 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3566 }
3567 #endif
3568 }
3569
3570 /*
3571 * DTLS-related tests done last, because most of them may result in
3572 * silently dropping the record (but not the whole datagram), and we only
3573 * want to consider that after ensuring that the "basic" fields (type,
3574 * version, length) are sane.
3575 */
3576 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3577 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3578 {
3579 unsigned int rec_epoch = ( ssl->in_ctr[0] << 8 ) | ssl->in_ctr[1];
3580
3581 /* Drop unexpected ChangeCipherSpec messages */
3582 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC &&
3583 ssl->state != MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC &&
3584 ssl->state != MBEDTLS_SSL_SERVER_CHANGE_CIPHER_SPEC )
3585 {
3586 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ChangeCipherSpec" ) );
3587 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3588 }
3589
3590 /* Drop unexpected ApplicationData records,
3591 * except at the beginning of renegotiations */
3592 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA &&
3593 ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER
3594 #if defined(MBEDTLS_SSL_RENEGOTIATION)
3595 && ! ( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS &&
3596 ssl->state == MBEDTLS_SSL_SERVER_HELLO )
3597 #endif
3598 )
3599 {
3600 MBEDTLS_SSL_DEBUG_MSG( 1, ( "dropping unexpected ApplicationData" ) );
3601 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3602 }
3603
3604 /* Check epoch (and sequence number) with DTLS */
3605 if( rec_epoch != ssl->in_epoch )
3606 {
3607 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record from another epoch: "
3608 "expected %d, received %d",
3609 ssl->in_epoch, rec_epoch ) );
3610
3611 #if defined(MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE) && defined(MBEDTLS_SSL_SRV_C)
3612 /*
3613 * Check for an epoch 0 ClientHello. We can't use in_msg here to
3614 * access the first byte of record content (handshake type), as we
3615 * have an active transform (possibly iv_len != 0), so use the
3616 * fact that the record header len is 13 instead.
3617 */
3618 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
3619 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER &&
3620 rec_epoch == 0 &&
3621 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
3622 ssl->in_left > 13 &&
3623 ssl->in_buf[13] == MBEDTLS_SSL_HS_CLIENT_HELLO )
3624 {
3625 MBEDTLS_SSL_DEBUG_MSG( 1, ( "possible client reconnect "
3626 "from the same port" ) );
3627 return( ssl_handle_possible_reconnect( ssl ) );
3628 }
3629 else
3630 #endif /* MBEDTLS_SSL_DTLS_CLIENT_PORT_REUSE && MBEDTLS_SSL_SRV_C */
3631 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3632 }
3633
3634 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3635 /* Replay detection only works for the current epoch */
3636 if( rec_epoch == ssl->in_epoch &&
3637 mbedtls_ssl_dtls_replay_check( ssl ) != 0 )
3638 {
3639 MBEDTLS_SSL_DEBUG_MSG( 1, ( "replayed record" ) );
3640 return( MBEDTLS_ERR_SSL_UNEXPECTED_RECORD );
3641 }
3642 #endif
3643 }
3644 #endif /* MBEDTLS_SSL_PROTO_DTLS */
3645
3646 return( 0 );
3647 }
3648
3649 /*
3650 * If applicable, decrypt (and decompress) record content
3651 */
ssl_prepare_record_content(mbedtls_ssl_context * ssl)3652 static int ssl_prepare_record_content( mbedtls_ssl_context *ssl )
3653 {
3654 int ret, done = 0;
3655
3656 MBEDTLS_SSL_DEBUG_BUF( 4, "input record from network",
3657 ssl->in_hdr, mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen );
3658
3659 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
3660 if( mbedtls_ssl_hw_record_read != NULL )
3661 {
3662 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_read()" ) );
3663
3664 ret = mbedtls_ssl_hw_record_read( ssl );
3665 if( ret != 0 && ret != MBEDTLS_ERR_SSL_HW_ACCEL_FALLTHROUGH )
3666 {
3667 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_read", ret );
3668 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
3669 }
3670
3671 if( ret == 0 )
3672 done = 1;
3673 }
3674 #endif /* MBEDTLS_SSL_HW_RECORD_ACCEL */
3675 if( !done && ssl->transform_in != NULL )
3676 {
3677 if( ( ret = ssl_decrypt_buf( ssl ) ) != 0 )
3678 {
3679 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decrypt_buf", ret );
3680 return( ret );
3681 }
3682
3683 MBEDTLS_SSL_DEBUG_BUF( 4, "input payload after decrypt",
3684 ssl->in_msg, ssl->in_msglen );
3685
3686 if( ssl->in_msglen > MBEDTLS_SSL_MAX_CONTENT_LEN )
3687 {
3688 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad message length" ) );
3689 return( MBEDTLS_ERR_SSL_INVALID_RECORD );
3690 }
3691 }
3692
3693 #if defined(MBEDTLS_ZLIB_SUPPORT)
3694 if( ssl->transform_in != NULL &&
3695 ssl->session_in->compression == MBEDTLS_SSL_COMPRESS_DEFLATE )
3696 {
3697 if( ( ret = ssl_decompress_buf( ssl ) ) != 0 )
3698 {
3699 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_decompress_buf", ret );
3700 return( ret );
3701 }
3702 }
3703 #endif /* MBEDTLS_ZLIB_SUPPORT */
3704
3705 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
3706 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3707 {
3708 mbedtls_ssl_dtls_replay_update( ssl );
3709 }
3710 #endif
3711
3712 return( 0 );
3713 }
3714
3715 static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl );
3716
3717 /*
3718 * Read a record.
3719 *
3720 * Silently ignore non-fatal alert (and for DTLS, invalid records as well,
3721 * RFC 6347 4.1.2.7) and continue reading until a valid record is found.
3722 *
3723 */
mbedtls_ssl_read_record(mbedtls_ssl_context * ssl)3724 int mbedtls_ssl_read_record( mbedtls_ssl_context *ssl )
3725 {
3726 int ret;
3727
3728 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read record" ) );
3729
3730 do {
3731
3732 if( ( ret = mbedtls_ssl_read_record_layer( ssl ) ) != 0 )
3733 {
3734 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_read_record_layer" ), ret );
3735 return( ret );
3736 }
3737
3738 ret = mbedtls_ssl_handle_message_type( ssl );
3739
3740 } while( MBEDTLS_ERR_SSL_NON_FATAL == ret );
3741
3742 if( 0 != ret )
3743 {
3744 MBEDTLS_SSL_DEBUG_RET( 1, ( "mbedtls_ssl_handle_message_type" ), ret );
3745 return( ret );
3746 }
3747
3748 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
3749 {
3750 mbedtls_ssl_update_handshake_status( ssl );
3751 }
3752
3753 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read record" ) );
3754
3755 return( 0 );
3756 }
3757
mbedtls_ssl_read_record_layer(mbedtls_ssl_context * ssl)3758 int mbedtls_ssl_read_record_layer( mbedtls_ssl_context *ssl )
3759 {
3760 int ret;
3761
3762 if( ssl->in_hslen != 0 && ssl->in_hslen < ssl->in_msglen )
3763 {
3764 /*
3765 * Get next Handshake message in the current record
3766 */
3767 ssl->in_msglen -= ssl->in_hslen;
3768
3769 memmove( ssl->in_msg, ssl->in_msg + ssl->in_hslen,
3770 ssl->in_msglen );
3771
3772 MBEDTLS_SSL_DEBUG_BUF( 4, "remaining content in record",
3773 ssl->in_msg, ssl->in_msglen );
3774
3775 return( 0 );
3776 }
3777
3778 ssl->in_hslen = 0;
3779
3780 /*
3781 * Read the record header and parse it
3782 */
3783 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3784 read_record_header:
3785 #endif
3786
3787 if( ( ret = mbedtls_ssl_fetch_input( ssl, mbedtls_ssl_hdr_len( ssl ) ) ) != 0 )
3788 {
3789 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
3790 return( ret );
3791 }
3792
3793 if( ( ret = ssl_parse_record_header( ssl ) ) != 0 )
3794 {
3795 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3796 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3797 ret != MBEDTLS_ERR_SSL_CLIENT_RECONNECT )
3798 {
3799 if( ret == MBEDTLS_ERR_SSL_UNEXPECTED_RECORD )
3800 {
3801 /* Skip unexpected record (but not whole datagram) */
3802 ssl->next_record_offset = ssl->in_msglen
3803 + mbedtls_ssl_hdr_len( ssl );
3804
3805 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding unexpected record "
3806 "(header)" ) );
3807 }
3808 else
3809 {
3810 /* Skip invalid record and the rest of the datagram */
3811 ssl->next_record_offset = 0;
3812 ssl->in_left = 0;
3813
3814 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record "
3815 "(header)" ) );
3816 }
3817
3818 /* Get next record */
3819 goto read_record_header;
3820 }
3821 #endif
3822 return( ret );
3823 }
3824
3825 /*
3826 * Read and optionally decrypt the message contents
3827 */
3828 if( ( ret = mbedtls_ssl_fetch_input( ssl,
3829 mbedtls_ssl_hdr_len( ssl ) + ssl->in_msglen ) ) != 0 )
3830 {
3831 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_fetch_input", ret );
3832 return( ret );
3833 }
3834
3835 /* Done reading this record, get ready for the next one */
3836 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3837 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3838 ssl->next_record_offset = ssl->in_msglen + mbedtls_ssl_hdr_len( ssl );
3839 else
3840 #endif
3841 ssl->in_left = 0;
3842
3843 if( ( ret = ssl_prepare_record_content( ssl ) ) != 0 )
3844 {
3845 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3846 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
3847 {
3848 /* Silently discard invalid records */
3849 if( ret == MBEDTLS_ERR_SSL_INVALID_RECORD ||
3850 ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3851 {
3852 /* Except when waiting for Finished as a bad mac here
3853 * probably means something went wrong in the handshake
3854 * (eg wrong psk used, mitm downgrade attempt, etc.) */
3855 if( ssl->state == MBEDTLS_SSL_CLIENT_FINISHED ||
3856 ssl->state == MBEDTLS_SSL_SERVER_FINISHED )
3857 {
3858 #if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
3859 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3860 {
3861 mbedtls_ssl_send_alert_message( ssl,
3862 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3863 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
3864 }
3865 #endif
3866 return( ret );
3867 }
3868
3869 #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
3870 if( ssl->conf->badmac_limit != 0 &&
3871 ++ssl->badmac_seen >= ssl->conf->badmac_limit )
3872 {
3873 MBEDTLS_SSL_DEBUG_MSG( 1, ( "too many records with bad MAC" ) );
3874 return( MBEDTLS_ERR_SSL_INVALID_MAC );
3875 }
3876 #endif
3877
3878 MBEDTLS_SSL_DEBUG_MSG( 1, ( "discarding invalid record (mac)" ) );
3879 goto read_record_header;
3880 }
3881
3882 return( ret );
3883 }
3884 else
3885 #endif
3886 {
3887 /* Error out (and send alert) on invalid records */
3888 #if defined(MBEDTLS_SSL_ALL_ALERT_MESSAGES)
3889 if( ret == MBEDTLS_ERR_SSL_INVALID_MAC )
3890 {
3891 mbedtls_ssl_send_alert_message( ssl,
3892 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
3893 MBEDTLS_SSL_ALERT_MSG_BAD_RECORD_MAC );
3894 }
3895 #endif
3896 return( ret );
3897 }
3898 }
3899
3900 /*
3901 * When we sent the last flight of the handshake, we MUST respond to a
3902 * retransmit of the peer's previous flight with a retransmit. (In
3903 * practice, only the Finished message will make it, other messages
3904 * including CCS use the old transform so they're dropped as invalid.)
3905 *
3906 * If the record we received is not a handshake message, however, it
3907 * means the peer received our last flight so we can clean up
3908 * handshake info.
3909 *
3910 * This check needs to be done before prepare_handshake() due to an edge
3911 * case: if the client immediately requests renegotiation, this
3912 * finishes the current handshake first, avoiding the new ClientHello
3913 * being mistaken for an ancient message in the current handshake.
3914 */
3915 #if defined(MBEDTLS_SSL_PROTO_DTLS)
3916 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
3917 ssl->handshake != NULL &&
3918 ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
3919 {
3920 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
3921 ssl->in_msg[0] == MBEDTLS_SSL_HS_FINISHED )
3922 {
3923 MBEDTLS_SSL_DEBUG_MSG( 2, ( "received retransmit of last flight" ) );
3924
3925 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
3926 {
3927 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_resend", ret );
3928 return( ret );
3929 }
3930
3931 return( MBEDTLS_ERR_SSL_WANT_READ );
3932 }
3933 else
3934 {
3935 ssl_handshake_wrapup_free_hs_transform( ssl );
3936 }
3937 }
3938 #endif
3939
3940 return( 0 );
3941 }
3942
mbedtls_ssl_handle_message_type(mbedtls_ssl_context * ssl)3943 int mbedtls_ssl_handle_message_type( mbedtls_ssl_context *ssl )
3944 {
3945 int ret;
3946
3947 /*
3948 * Handle particular types of records
3949 */
3950 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
3951 {
3952 if( ( ret = mbedtls_ssl_prepare_handshake_record( ssl ) ) != 0 )
3953 {
3954 return( ret );
3955 }
3956 }
3957
3958 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
3959 {
3960 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got an alert message, type: [%d:%d]",
3961 ssl->in_msg[0], ssl->in_msg[1] ) );
3962
3963 /*
3964 * Ignore non-fatal alerts, except close_notify and no_renegotiation
3965 */
3966 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_FATAL )
3967 {
3968 MBEDTLS_SSL_DEBUG_MSG( 1, ( "is a fatal alert message (msg %d)",
3969 ssl->in_msg[1] ) );
3970 return( MBEDTLS_ERR_SSL_FATAL_ALERT_MESSAGE );
3971 }
3972
3973 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
3974 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY )
3975 {
3976 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a close notify message" ) );
3977 return( MBEDTLS_ERR_SSL_PEER_CLOSE_NOTIFY );
3978 }
3979
3980 #if defined(MBEDTLS_SSL_RENEGOTIATION_ENABLED)
3981 if( ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
3982 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION )
3983 {
3984 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
3985 /* Will be handled when trying to parse ServerHello */
3986 return( 0 );
3987 }
3988 #endif
3989
3990 #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_SRV_C)
3991 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 &&
3992 ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
3993 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
3994 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
3995 {
3996 MBEDTLS_SSL_DEBUG_MSG( 2, ( "is a SSLv3 no_cert" ) );
3997 /* Will be handled in mbedtls_ssl_parse_certificate() */
3998 return( 0 );
3999 }
4000 #endif /* MBEDTLS_SSL_PROTO_SSL3 && MBEDTLS_SSL_SRV_C */
4001
4002 /* Silently ignore: fetch new message */
4003 return MBEDTLS_ERR_SSL_NON_FATAL;
4004 }
4005
4006 return( 0 );
4007 }
4008
mbedtls_ssl_send_fatal_handshake_failure(mbedtls_ssl_context * ssl)4009 int mbedtls_ssl_send_fatal_handshake_failure( mbedtls_ssl_context *ssl )
4010 {
4011 int ret;
4012
4013 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
4014 MBEDTLS_SSL_ALERT_LEVEL_FATAL,
4015 MBEDTLS_SSL_ALERT_MSG_HANDSHAKE_FAILURE ) ) != 0 )
4016 {
4017 return( ret );
4018 }
4019
4020 return( 0 );
4021 }
4022
mbedtls_ssl_send_alert_message(mbedtls_ssl_context * ssl,unsigned char level,unsigned char message)4023 int mbedtls_ssl_send_alert_message( mbedtls_ssl_context *ssl,
4024 unsigned char level,
4025 unsigned char message )
4026 {
4027 int ret;
4028
4029 if( ssl == NULL || ssl->conf == NULL )
4030 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
4031
4032 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> send alert message" ) );
4033
4034 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
4035 ssl->out_msglen = 2;
4036 ssl->out_msg[0] = level;
4037 ssl->out_msg[1] = message;
4038
4039 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
4040 {
4041 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
4042 return( ret );
4043 }
4044
4045 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= send alert message" ) );
4046
4047 return( 0 );
4048 }
4049
4050 /*
4051 * Handshake functions
4052 */
4053 #if !defined(MBEDTLS_KEY_EXCHANGE_RSA_ENABLED) && \
4054 !defined(MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED) && \
4055 !defined(MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED) && \
4056 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED) && \
4057 !defined(MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED) && \
4058 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED) && \
4059 !defined(MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED)
mbedtls_ssl_write_certificate(mbedtls_ssl_context * ssl)4060 int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
4061 {
4062 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4063
4064 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
4065
4066 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4067 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4068 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4069 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
4070 {
4071 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
4072 ssl->state++;
4073 return( 0 );
4074 }
4075
4076 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4077 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
4078 }
4079
mbedtls_ssl_parse_certificate(mbedtls_ssl_context * ssl)4080 int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
4081 {
4082 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4083
4084 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
4085
4086 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4087 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4088 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4089 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
4090 {
4091 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4092 ssl->state++;
4093 return( 0 );
4094 }
4095
4096 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4097 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
4098 }
4099 #else
mbedtls_ssl_write_certificate(mbedtls_ssl_context * ssl)4100 int mbedtls_ssl_write_certificate( mbedtls_ssl_context *ssl )
4101 {
4102 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
4103 size_t i, n;
4104 const mbedtls_x509_crt *crt;
4105 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4106
4107 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write certificate" ) );
4108
4109 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4110 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4111 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4112 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
4113 {
4114 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
4115 ssl->state++;
4116 return( 0 );
4117 }
4118
4119 #if defined(MBEDTLS_SSL_CLI_C)
4120 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
4121 {
4122 if( ssl->client_auth == 0 )
4123 {
4124 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip write certificate" ) );
4125 ssl->state++;
4126 return( 0 );
4127 }
4128
4129 #if defined(MBEDTLS_SSL_PROTO_SSL3)
4130 /*
4131 * If using SSLv3 and got no cert, send an Alert message
4132 * (otherwise an empty Certificate message will be sent).
4133 */
4134 if( mbedtls_ssl_own_cert( ssl ) == NULL &&
4135 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
4136 {
4137 ssl->out_msglen = 2;
4138 ssl->out_msgtype = MBEDTLS_SSL_MSG_ALERT;
4139 ssl->out_msg[0] = MBEDTLS_SSL_ALERT_LEVEL_WARNING;
4140 ssl->out_msg[1] = MBEDTLS_SSL_ALERT_MSG_NO_CERT;
4141
4142 MBEDTLS_SSL_DEBUG_MSG( 2, ( "got no certificate to send" ) );
4143 goto write_msg;
4144 }
4145 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
4146 }
4147 #endif /* MBEDTLS_SSL_CLI_C */
4148 #if defined(MBEDTLS_SSL_SRV_C)
4149 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
4150 {
4151 if( mbedtls_ssl_own_cert( ssl ) == NULL )
4152 {
4153 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no certificate to send" ) );
4154 return( MBEDTLS_ERR_SSL_CERTIFICATE_REQUIRED );
4155 }
4156 }
4157 #endif
4158
4159 MBEDTLS_SSL_DEBUG_CRT( 3, "own certificate", mbedtls_ssl_own_cert( ssl ) );
4160
4161 /*
4162 * 0 . 0 handshake type
4163 * 1 . 3 handshake length
4164 * 4 . 6 length of all certs
4165 * 7 . 9 length of cert. 1
4166 * 10 . n-1 peer certificate
4167 * n . n+2 length of cert. 2
4168 * n+3 . ... upper level cert, etc.
4169 */
4170 i = 7;
4171 crt = mbedtls_ssl_own_cert( ssl );
4172
4173 while( crt != NULL )
4174 {
4175 n = crt->raw.len;
4176 if( n > MBEDTLS_SSL_MAX_CONTENT_LEN - 3 - i )
4177 {
4178 MBEDTLS_SSL_DEBUG_MSG( 1, ( "certificate too large, %d > %d",
4179 i + 3 + n, MBEDTLS_SSL_MAX_CONTENT_LEN ) );
4180 return( MBEDTLS_ERR_SSL_CERTIFICATE_TOO_LARGE );
4181 }
4182
4183 ssl->out_msg[i ] = (unsigned char)( n >> 16 );
4184 ssl->out_msg[i + 1] = (unsigned char)( n >> 8 );
4185 ssl->out_msg[i + 2] = (unsigned char)( n );
4186
4187 i += 3; memcpy( ssl->out_msg + i, crt->raw.p, n );
4188 i += n; crt = crt->next;
4189 }
4190
4191 ssl->out_msg[4] = (unsigned char)( ( i - 7 ) >> 16 );
4192 ssl->out_msg[5] = (unsigned char)( ( i - 7 ) >> 8 );
4193 ssl->out_msg[6] = (unsigned char)( ( i - 7 ) );
4194
4195 ssl->out_msglen = i;
4196 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
4197 ssl->out_msg[0] = MBEDTLS_SSL_HS_CERTIFICATE;
4198
4199 #if defined(MBEDTLS_SSL_PROTO_SSL3) && defined(MBEDTLS_SSL_CLI_C)
4200 write_msg:
4201 #endif
4202
4203 ssl->state++;
4204
4205 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
4206 {
4207 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
4208 return( ret );
4209 }
4210
4211 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write certificate" ) );
4212
4213 return( ret );
4214 }
4215
mbedtls_ssl_parse_certificate(mbedtls_ssl_context * ssl)4216 int mbedtls_ssl_parse_certificate( mbedtls_ssl_context *ssl )
4217 {
4218 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
4219 size_t i, n;
4220 const mbedtls_ssl_ciphersuite_t *ciphersuite_info = ssl->transform_negotiate->ciphersuite_info;
4221 int authmode = ssl->conf->authmode;
4222
4223 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse certificate" ) );
4224
4225 if( ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_PSK ||
4226 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_DHE_PSK ||
4227 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECDHE_PSK ||
4228 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_ECJPAKE )
4229 {
4230 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4231 ssl->state++;
4232 return( 0 );
4233 }
4234
4235 #if defined(MBEDTLS_SSL_SRV_C)
4236 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4237 ciphersuite_info->key_exchange == MBEDTLS_KEY_EXCHANGE_RSA_PSK )
4238 {
4239 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4240 ssl->state++;
4241 return( 0 );
4242 }
4243
4244 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
4245 if( ssl->handshake->sni_authmode != MBEDTLS_SSL_VERIFY_UNSET )
4246 authmode = ssl->handshake->sni_authmode;
4247 #endif
4248
4249 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4250 authmode == MBEDTLS_SSL_VERIFY_NONE )
4251 {
4252 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_SKIP_VERIFY;
4253 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= skip parse certificate" ) );
4254 ssl->state++;
4255 return( 0 );
4256 }
4257 #endif
4258
4259 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
4260 {
4261 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
4262 return( ret );
4263 }
4264
4265 ssl->state++;
4266
4267 #if defined(MBEDTLS_SSL_SRV_C)
4268 #if defined(MBEDTLS_SSL_PROTO_SSL3)
4269 /*
4270 * Check if the client sent an empty certificate
4271 */
4272 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4273 ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
4274 {
4275 if( ssl->in_msglen == 2 &&
4276 ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT &&
4277 ssl->in_msg[0] == MBEDTLS_SSL_ALERT_LEVEL_WARNING &&
4278 ssl->in_msg[1] == MBEDTLS_SSL_ALERT_MSG_NO_CERT )
4279 {
4280 MBEDTLS_SSL_DEBUG_MSG( 1, ( "SSLv3 client has no certificate" ) );
4281
4282 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
4283 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
4284 return( 0 );
4285 else
4286 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
4287 }
4288 }
4289 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
4290
4291 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
4292 defined(MBEDTLS_SSL_PROTO_TLS1_2)
4293 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
4294 ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_0 )
4295 {
4296 if( ssl->in_hslen == 3 + mbedtls_ssl_hs_hdr_len( ssl ) &&
4297 ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE &&
4298 ssl->in_msg[0] == MBEDTLS_SSL_HS_CERTIFICATE &&
4299 memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ), "\0\0\0", 3 ) == 0 )
4300 {
4301 MBEDTLS_SSL_DEBUG_MSG( 1, ( "TLSv1 client has no certificate" ) );
4302
4303 ssl->session_negotiate->verify_result = MBEDTLS_X509_BADCERT_MISSING;
4304 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
4305 return( 0 );
4306 else
4307 return( MBEDTLS_ERR_SSL_NO_CLIENT_CERTIFICATE );
4308 }
4309 }
4310 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 || \
4311 MBEDTLS_SSL_PROTO_TLS1_2 */
4312 #endif /* MBEDTLS_SSL_SRV_C */
4313
4314 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
4315 {
4316 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4317 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
4318 }
4319
4320 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_CERTIFICATE ||
4321 ssl->in_hslen < mbedtls_ssl_hs_hdr_len( ssl ) + 3 + 3 )
4322 {
4323 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4324 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4325 }
4326
4327 i = mbedtls_ssl_hs_hdr_len( ssl );
4328
4329 /*
4330 * Same message structure as in mbedtls_ssl_write_certificate()
4331 */
4332 n = ( ssl->in_msg[i+1] << 8 ) | ssl->in_msg[i+2];
4333
4334 if( ssl->in_msg[i] != 0 ||
4335 ssl->in_hslen != n + 3 + mbedtls_ssl_hs_hdr_len( ssl ) )
4336 {
4337 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4338 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4339 }
4340
4341 /* In case we tried to reuse a session but it failed */
4342 if( ssl->session_negotiate->peer_cert != NULL )
4343 {
4344 mbedtls_x509_crt_free( ssl->session_negotiate->peer_cert );
4345 mbedtls_free( ssl->session_negotiate->peer_cert );
4346 }
4347
4348 if( ( ssl->session_negotiate->peer_cert = mbedtls_calloc( 1,
4349 sizeof( mbedtls_x509_crt ) ) ) == NULL )
4350 {
4351 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed",
4352 sizeof( mbedtls_x509_crt ) ) );
4353 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
4354 }
4355
4356 mbedtls_x509_crt_init( ssl->session_negotiate->peer_cert );
4357
4358 i += 3;
4359
4360 while( i < ssl->in_hslen )
4361 {
4362 if( ssl->in_msg[i] != 0 )
4363 {
4364 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4365 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4366 }
4367
4368 n = ( (unsigned int) ssl->in_msg[i + 1] << 8 )
4369 | (unsigned int) ssl->in_msg[i + 2];
4370 i += 3;
4371
4372 if( n < 128 || i + n > ssl->in_hslen )
4373 {
4374 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate message" ) );
4375 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4376 }
4377
4378 ret = mbedtls_x509_crt_parse_der( ssl->session_negotiate->peer_cert,
4379 ssl->in_msg + i, n );
4380 if( 0 != ret && ( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG + MBEDTLS_ERR_OID_NOT_FOUND ) != ret )
4381 {
4382 MBEDTLS_SSL_DEBUG_RET( 1, " mbedtls_x509_crt_parse_der", ret );
4383 return( ret );
4384 }
4385
4386 i += n;
4387 }
4388
4389 MBEDTLS_SSL_DEBUG_CRT( 3, "peer certificate", ssl->session_negotiate->peer_cert );
4390
4391 /*
4392 * On client, make sure the server cert doesn't change during renego to
4393 * avoid "triple handshake" attack: https://secure-resumption.com/
4394 */
4395 #if defined(MBEDTLS_SSL_RENEGOTIATION) && defined(MBEDTLS_SSL_CLI_C)
4396 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
4397 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
4398 {
4399 if( ssl->session->peer_cert == NULL )
4400 {
4401 MBEDTLS_SSL_DEBUG_MSG( 1, ( "new server cert during renegotiation" ) );
4402 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4403 }
4404
4405 if( ssl->session->peer_cert->raw.len !=
4406 ssl->session_negotiate->peer_cert->raw.len ||
4407 memcmp( ssl->session->peer_cert->raw.p,
4408 ssl->session_negotiate->peer_cert->raw.p,
4409 ssl->session->peer_cert->raw.len ) != 0 )
4410 {
4411 MBEDTLS_SSL_DEBUG_MSG( 1, ( "server cert changed during renegotiation" ) );
4412 return( MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE );
4413 }
4414 }
4415 #endif /* MBEDTLS_SSL_RENEGOTIATION && MBEDTLS_SSL_CLI_C */
4416
4417 if( authmode != MBEDTLS_SSL_VERIFY_NONE )
4418 {
4419 mbedtls_x509_crt *ca_chain;
4420 mbedtls_x509_crl *ca_crl;
4421
4422 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
4423 if( ssl->handshake->sni_ca_chain != NULL )
4424 {
4425 ca_chain = ssl->handshake->sni_ca_chain;
4426 ca_crl = ssl->handshake->sni_ca_crl;
4427 }
4428 else
4429 #endif
4430 {
4431 ca_chain = ssl->conf->ca_chain;
4432 ca_crl = ssl->conf->ca_crl;
4433 }
4434
4435 if( ca_chain == NULL )
4436 {
4437 MBEDTLS_SSL_DEBUG_MSG( 1, ( "got no CA chain" ) );
4438 return( MBEDTLS_ERR_SSL_CA_CHAIN_REQUIRED );
4439 }
4440
4441 /*
4442 * Main check: verify certificate
4443 */
4444 ret = mbedtls_x509_crt_verify_with_profile(
4445 ssl->session_negotiate->peer_cert,
4446 ca_chain, ca_crl,
4447 ssl->conf->cert_profile,
4448 ssl->hostname,
4449 &ssl->session_negotiate->verify_result,
4450 ssl->conf->f_vrfy, ssl->conf->p_vrfy );
4451
4452 if( ret != 0 )
4453 {
4454 MBEDTLS_SSL_DEBUG_RET( 1, "x509_verify_cert", ret );
4455 }
4456
4457 /*
4458 * Secondary checks: always done, but change 'ret' only if it was 0
4459 */
4460
4461 #if defined(MBEDTLS_ECP_C)
4462 {
4463 const mbedtls_pk_context *pk = &ssl->session_negotiate->peer_cert->pk;
4464
4465 /* If certificate uses an EC key, make sure the curve is OK */
4466 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECKEY ) &&
4467 mbedtls_ssl_check_curve( ssl, mbedtls_pk_ec( *pk )->grp.id ) != 0 )
4468 {
4469 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (EC key curve)" ) );
4470 if( ret == 0 )
4471 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
4472 }
4473 }
4474 #endif /* MBEDTLS_ECP_C */
4475
4476 if( mbedtls_ssl_check_cert_usage( ssl->session_negotiate->peer_cert,
4477 ciphersuite_info,
4478 ! ssl->conf->endpoint,
4479 &ssl->session_negotiate->verify_result ) != 0 )
4480 {
4481 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad certificate (usage extensions)" ) );
4482 if( ret == 0 )
4483 ret = MBEDTLS_ERR_SSL_BAD_HS_CERTIFICATE;
4484 }
4485
4486 if( authmode == MBEDTLS_SSL_VERIFY_OPTIONAL )
4487 ret = 0;
4488 }
4489
4490 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse certificate" ) );
4491
4492 return( ret );
4493 }
4494 #endif /* !MBEDTLS_KEY_EXCHANGE_RSA_ENABLED
4495 !MBEDTLS_KEY_EXCHANGE_RSA_PSK_ENABLED
4496 !MBEDTLS_KEY_EXCHANGE_DHE_RSA_ENABLED
4497 !MBEDTLS_KEY_EXCHANGE_ECDHE_RSA_ENABLED
4498 !MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA_ENABLED
4499 !MBEDTLS_KEY_EXCHANGE_ECDH_RSA_ENABLED
4500 !MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA_ENABLED */
4501
mbedtls_ssl_write_change_cipher_spec(mbedtls_ssl_context * ssl)4502 int mbedtls_ssl_write_change_cipher_spec( mbedtls_ssl_context *ssl )
4503 {
4504 int ret;
4505
4506 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write change cipher spec" ) );
4507
4508 ssl->out_msgtype = MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC;
4509 ssl->out_msglen = 1;
4510 ssl->out_msg[0] = 1;
4511
4512 ssl->state++;
4513
4514 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
4515 {
4516 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
4517 return( ret );
4518 }
4519
4520 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write change cipher spec" ) );
4521
4522 return( 0 );
4523 }
4524
mbedtls_ssl_parse_change_cipher_spec(mbedtls_ssl_context * ssl)4525 int mbedtls_ssl_parse_change_cipher_spec( mbedtls_ssl_context *ssl )
4526 {
4527 int ret;
4528
4529 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse change cipher spec" ) );
4530
4531 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
4532 {
4533 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
4534 return( ret );
4535 }
4536
4537 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_CHANGE_CIPHER_SPEC )
4538 {
4539 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
4540 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
4541 }
4542
4543 if( ssl->in_msglen != 1 || ssl->in_msg[0] != 1 )
4544 {
4545 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad change cipher spec message" ) );
4546 return( MBEDTLS_ERR_SSL_BAD_HS_CHANGE_CIPHER_SPEC );
4547 }
4548
4549 /*
4550 * Switch to our negotiated transform and session parameters for inbound
4551 * data.
4552 */
4553 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for inbound data" ) );
4554 ssl->transform_in = ssl->transform_negotiate;
4555 ssl->session_in = ssl->session_negotiate;
4556
4557 #if defined(MBEDTLS_SSL_PROTO_DTLS)
4558 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
4559 {
4560 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
4561 ssl_dtls_replay_reset( ssl );
4562 #endif
4563
4564 /* Increment epoch */
4565 if( ++ssl->in_epoch == 0 )
4566 {
4567 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
4568 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
4569 }
4570 }
4571 else
4572 #endif /* MBEDTLS_SSL_PROTO_DTLS */
4573 memset( ssl->in_ctr, 0, 8 );
4574
4575 /*
4576 * Set the in_msg pointer to the correct location based on IV length
4577 */
4578 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
4579 {
4580 ssl->in_msg = ssl->in_iv + ssl->transform_negotiate->ivlen -
4581 ssl->transform_negotiate->fixed_ivlen;
4582 }
4583 else
4584 ssl->in_msg = ssl->in_iv;
4585
4586 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
4587 if( mbedtls_ssl_hw_record_activate != NULL )
4588 {
4589 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_INBOUND ) ) != 0 )
4590 {
4591 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
4592 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
4593 }
4594 }
4595 #endif
4596
4597 ssl->state++;
4598
4599 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse change cipher spec" ) );
4600
4601 return( 0 );
4602 }
4603
mbedtls_ssl_optimize_checksum(mbedtls_ssl_context * ssl,const mbedtls_ssl_ciphersuite_t * ciphersuite_info)4604 void mbedtls_ssl_optimize_checksum( mbedtls_ssl_context *ssl,
4605 const mbedtls_ssl_ciphersuite_t *ciphersuite_info )
4606 {
4607 ((void) ciphersuite_info);
4608
4609 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4610 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4611 if( ssl->minor_ver < MBEDTLS_SSL_MINOR_VERSION_3 )
4612 ssl->handshake->update_checksum = ssl_update_checksum_md5sha1;
4613 else
4614 #endif
4615 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4616 #if defined(MBEDTLS_SHA512_C)
4617 if( ciphersuite_info->mac == MBEDTLS_MD_SHA384 )
4618 ssl->handshake->update_checksum = ssl_update_checksum_sha384;
4619 else
4620 #endif
4621 #if defined(MBEDTLS_SHA256_C)
4622 if( ciphersuite_info->mac != MBEDTLS_MD_SHA384 )
4623 ssl->handshake->update_checksum = ssl_update_checksum_sha256;
4624 else
4625 #endif
4626 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4627 {
4628 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
4629 return;
4630 }
4631 }
4632
mbedtls_ssl_reset_checksum(mbedtls_ssl_context * ssl)4633 void mbedtls_ssl_reset_checksum( mbedtls_ssl_context *ssl )
4634 {
4635 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4636 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4637 mbedtls_md5_starts( &ssl->handshake->fin_md5 );
4638 mbedtls_sha1_starts( &ssl->handshake->fin_sha1 );
4639 #endif
4640 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4641 #if defined(MBEDTLS_SHA256_C)
4642 mbedtls_sha256_starts( &ssl->handshake->fin_sha256, 0 );
4643 #endif
4644 #if defined(MBEDTLS_SHA512_C)
4645 mbedtls_sha512_starts( &ssl->handshake->fin_sha512, 1 );
4646 #endif
4647 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4648 }
4649
ssl_update_checksum_start(mbedtls_ssl_context * ssl,const unsigned char * buf,size_t len)4650 static void ssl_update_checksum_start( mbedtls_ssl_context *ssl,
4651 const unsigned char *buf, size_t len )
4652 {
4653 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4654 defined(MBEDTLS_SSL_PROTO_TLS1_1)
4655 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4656 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
4657 #endif
4658 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4659 #if defined(MBEDTLS_SHA256_C)
4660 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
4661 #endif
4662 #if defined(MBEDTLS_SHA512_C)
4663 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
4664 #endif
4665 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4666 }
4667
4668 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
4669 defined(MBEDTLS_SSL_PROTO_TLS1_1)
ssl_update_checksum_md5sha1(mbedtls_ssl_context * ssl,const unsigned char * buf,size_t len)4670 static void ssl_update_checksum_md5sha1( mbedtls_ssl_context *ssl,
4671 const unsigned char *buf, size_t len )
4672 {
4673 mbedtls_md5_update( &ssl->handshake->fin_md5 , buf, len );
4674 mbedtls_sha1_update( &ssl->handshake->fin_sha1, buf, len );
4675 }
4676 #endif
4677
4678 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4679 #if defined(MBEDTLS_SHA256_C)
ssl_update_checksum_sha256(mbedtls_ssl_context * ssl,const unsigned char * buf,size_t len)4680 static void ssl_update_checksum_sha256( mbedtls_ssl_context *ssl,
4681 const unsigned char *buf, size_t len )
4682 {
4683 mbedtls_sha256_update( &ssl->handshake->fin_sha256, buf, len );
4684 }
4685 #endif
4686
4687 #if defined(MBEDTLS_SHA512_C)
ssl_update_checksum_sha384(mbedtls_ssl_context * ssl,const unsigned char * buf,size_t len)4688 static void ssl_update_checksum_sha384( mbedtls_ssl_context *ssl,
4689 const unsigned char *buf, size_t len )
4690 {
4691 mbedtls_sha512_update( &ssl->handshake->fin_sha512, buf, len );
4692 }
4693 #endif
4694 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4695
4696 #if defined(MBEDTLS_SSL_PROTO_SSL3)
ssl_calc_finished_ssl(mbedtls_ssl_context * ssl,unsigned char * buf,int from)4697 static void ssl_calc_finished_ssl(
4698 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4699 {
4700 const char *sender;
4701 mbedtls_md5_context md5;
4702 mbedtls_sha1_context sha1;
4703
4704 unsigned char padbuf[48];
4705 unsigned char md5sum[16];
4706 unsigned char sha1sum[20];
4707
4708 mbedtls_ssl_session *session = ssl->session_negotiate;
4709 if( !session )
4710 session = ssl->session;
4711
4712 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished ssl" ) );
4713
4714 mbedtls_md5_init( &md5 );
4715 mbedtls_sha1_init( &sha1 );
4716
4717 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
4718 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
4719
4720 /*
4721 * SSLv3:
4722 * hash =
4723 * MD5( master + pad2 +
4724 * MD5( handshake + sender + master + pad1 ) )
4725 * + SHA1( master + pad2 +
4726 * SHA1( handshake + sender + master + pad1 ) )
4727 */
4728
4729 #if !defined(MBEDTLS_MD5_ALT)
4730 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
4731 md5.state, sizeof( md5.state ) );
4732 #endif
4733
4734 #if !defined(MBEDTLS_SHA1_ALT)
4735 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
4736 sha1.state, sizeof( sha1.state ) );
4737 #endif
4738
4739 sender = ( from == MBEDTLS_SSL_IS_CLIENT ) ? "CLNT"
4740 : "SRVR";
4741
4742 memset( padbuf, 0x36, 48 );
4743
4744 mbedtls_md5_update( &md5, (const unsigned char *) sender, 4 );
4745 mbedtls_md5_update( &md5, session->master, 48 );
4746 mbedtls_md5_update( &md5, padbuf, 48 );
4747 mbedtls_md5_finish( &md5, md5sum );
4748
4749 mbedtls_sha1_update( &sha1, (const unsigned char *) sender, 4 );
4750 mbedtls_sha1_update( &sha1, session->master, 48 );
4751 mbedtls_sha1_update( &sha1, padbuf, 40 );
4752 mbedtls_sha1_finish( &sha1, sha1sum );
4753
4754 memset( padbuf, 0x5C, 48 );
4755
4756 mbedtls_md5_starts( &md5 );
4757 mbedtls_md5_update( &md5, session->master, 48 );
4758 mbedtls_md5_update( &md5, padbuf, 48 );
4759 mbedtls_md5_update( &md5, md5sum, 16 );
4760 mbedtls_md5_finish( &md5, buf );
4761
4762 mbedtls_sha1_starts( &sha1 );
4763 mbedtls_sha1_update( &sha1, session->master, 48 );
4764 mbedtls_sha1_update( &sha1, padbuf , 40 );
4765 mbedtls_sha1_update( &sha1, sha1sum, 20 );
4766 mbedtls_sha1_finish( &sha1, buf + 16 );
4767
4768 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, 36 );
4769
4770 mbedtls_md5_free( &md5 );
4771 mbedtls_sha1_free( &sha1 );
4772
4773 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4774 mbedtls_zeroize( md5sum, sizeof( md5sum ) );
4775 mbedtls_zeroize( sha1sum, sizeof( sha1sum ) );
4776
4777 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4778 }
4779 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
4780
4781 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
ssl_calc_finished_tls(mbedtls_ssl_context * ssl,unsigned char * buf,int from)4782 static void ssl_calc_finished_tls(
4783 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4784 {
4785 int len = 12;
4786 const char *sender;
4787 mbedtls_md5_context md5;
4788 mbedtls_sha1_context sha1;
4789 unsigned char padbuf[36];
4790
4791 mbedtls_ssl_session *session = ssl->session_negotiate;
4792 if( !session )
4793 session = ssl->session;
4794
4795 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls" ) );
4796
4797 mbedtls_md5_init( &md5 );
4798 mbedtls_sha1_init( &sha1 );
4799
4800 mbedtls_md5_clone( &md5, &ssl->handshake->fin_md5 );
4801 mbedtls_sha1_clone( &sha1, &ssl->handshake->fin_sha1 );
4802
4803 /*
4804 * TLSv1:
4805 * hash = PRF( master, finished_label,
4806 * MD5( handshake ) + SHA1( handshake ) )[0..11]
4807 */
4808
4809 #if !defined(MBEDTLS_MD5_ALT)
4810 MBEDTLS_SSL_DEBUG_BUF( 4, "finished md5 state", (unsigned char *)
4811 md5.state, sizeof( md5.state ) );
4812 #endif
4813
4814 #if !defined(MBEDTLS_SHA1_ALT)
4815 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha1 state", (unsigned char *)
4816 sha1.state, sizeof( sha1.state ) );
4817 #endif
4818
4819 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
4820 ? "client finished"
4821 : "server finished";
4822
4823 mbedtls_md5_finish( &md5, padbuf );
4824 mbedtls_sha1_finish( &sha1, padbuf + 16 );
4825
4826 ssl->handshake->tls_prf( session->master, 48, sender,
4827 padbuf, 36, buf, len );
4828
4829 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
4830
4831 mbedtls_md5_free( &md5 );
4832 mbedtls_sha1_free( &sha1 );
4833
4834 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4835
4836 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4837 }
4838 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
4839
4840 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
4841 #if defined(MBEDTLS_SHA256_C)
ssl_calc_finished_tls_sha256(mbedtls_ssl_context * ssl,unsigned char * buf,int from)4842 static void ssl_calc_finished_tls_sha256(
4843 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4844 {
4845 int len = 12;
4846 const char *sender;
4847 mbedtls_sha256_context sha256;
4848 unsigned char padbuf[32];
4849
4850 mbedtls_ssl_session *session = ssl->session_negotiate;
4851 if( !session )
4852 session = ssl->session;
4853
4854 mbedtls_sha256_init( &sha256 );
4855
4856 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha256" ) );
4857
4858 mbedtls_sha256_clone( &sha256, &ssl->handshake->fin_sha256 );
4859
4860 /*
4861 * TLSv1.2:
4862 * hash = PRF( master, finished_label,
4863 * Hash( handshake ) )[0.11]
4864 */
4865
4866 #if !defined(MBEDTLS_SHA256_ALT)
4867 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha2 state", (unsigned char *)
4868 sha256.state, sizeof( sha256.state ) );
4869 #endif
4870
4871 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
4872 ? "client finished"
4873 : "server finished";
4874
4875 mbedtls_sha256_finish( &sha256, padbuf );
4876
4877 ssl->handshake->tls_prf( session->master, 48, sender,
4878 padbuf, 32, buf, len );
4879
4880 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
4881
4882 mbedtls_sha256_free( &sha256 );
4883
4884 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4885
4886 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4887 }
4888 #endif /* MBEDTLS_SHA256_C */
4889
4890 #if defined(MBEDTLS_SHA512_C)
ssl_calc_finished_tls_sha384(mbedtls_ssl_context * ssl,unsigned char * buf,int from)4891 static void ssl_calc_finished_tls_sha384(
4892 mbedtls_ssl_context *ssl, unsigned char *buf, int from )
4893 {
4894 int len = 12;
4895 const char *sender;
4896 mbedtls_sha512_context sha512;
4897 unsigned char padbuf[48];
4898
4899 mbedtls_ssl_session *session = ssl->session_negotiate;
4900 if( !session )
4901 session = ssl->session;
4902
4903 mbedtls_sha512_init( &sha512 );
4904
4905 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> calc finished tls sha384" ) );
4906
4907 mbedtls_sha512_clone( &sha512, &ssl->handshake->fin_sha512 );
4908
4909 /*
4910 * TLSv1.2:
4911 * hash = PRF( master, finished_label,
4912 * Hash( handshake ) )[0.11]
4913 */
4914
4915 #if !defined(MBEDTLS_SHA512_ALT)
4916 MBEDTLS_SSL_DEBUG_BUF( 4, "finished sha512 state", (unsigned char *)
4917 sha512.state, sizeof( sha512.state ) );
4918 #endif
4919
4920 sender = ( from == MBEDTLS_SSL_IS_CLIENT )
4921 ? "client finished"
4922 : "server finished";
4923
4924 mbedtls_sha512_finish( &sha512, padbuf );
4925
4926 ssl->handshake->tls_prf( session->master, 48, sender,
4927 padbuf, 48, buf, len );
4928
4929 MBEDTLS_SSL_DEBUG_BUF( 3, "calc finished result", buf, len );
4930
4931 mbedtls_sha512_free( &sha512 );
4932
4933 mbedtls_zeroize( padbuf, sizeof( padbuf ) );
4934
4935 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= calc finished" ) );
4936 }
4937 #endif /* MBEDTLS_SHA512_C */
4938 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
4939
ssl_handshake_wrapup_free_hs_transform(mbedtls_ssl_context * ssl)4940 static void ssl_handshake_wrapup_free_hs_transform( mbedtls_ssl_context *ssl )
4941 {
4942 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup: final free" ) );
4943
4944 /*
4945 * Free our handshake params
4946 */
4947 mbedtls_ssl_handshake_free( ssl->handshake );
4948 mbedtls_free( ssl->handshake );
4949 ssl->handshake = NULL;
4950
4951 /*
4952 * Free the previous transform and swith in the current one
4953 */
4954 if( ssl->transform )
4955 {
4956 mbedtls_ssl_transform_free( ssl->transform );
4957 mbedtls_free( ssl->transform );
4958 }
4959 ssl->transform = ssl->transform_negotiate;
4960 ssl->transform_negotiate = NULL;
4961
4962 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup: final free" ) );
4963 }
4964
mbedtls_ssl_handshake_wrapup(mbedtls_ssl_context * ssl)4965 void mbedtls_ssl_handshake_wrapup( mbedtls_ssl_context *ssl )
4966 {
4967 int resume = ssl->handshake->resume;
4968
4969 MBEDTLS_SSL_DEBUG_MSG( 3, ( "=> handshake wrapup" ) );
4970
4971 #if defined(MBEDTLS_SSL_RENEGOTIATION)
4972 if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
4973 {
4974 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_DONE;
4975 ssl->renego_records_seen = 0;
4976 }
4977 #endif
4978
4979 /*
4980 * Free the previous session and switch in the current one
4981 */
4982 if( ssl->session )
4983 {
4984 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
4985 /* RFC 7366 3.1: keep the EtM state */
4986 ssl->session_negotiate->encrypt_then_mac =
4987 ssl->session->encrypt_then_mac;
4988 #endif
4989
4990 mbedtls_ssl_session_free( ssl->session );
4991 mbedtls_free( ssl->session );
4992 }
4993 ssl->session = ssl->session_negotiate;
4994 ssl->session_negotiate = NULL;
4995
4996 /*
4997 * Add cache entry
4998 */
4999 if( ssl->conf->f_set_cache != NULL &&
5000 ssl->session->id_len != 0 &&
5001 resume == 0 )
5002 {
5003 if( ssl->conf->f_set_cache( ssl->conf->p_cache, ssl->session ) != 0 )
5004 MBEDTLS_SSL_DEBUG_MSG( 1, ( "cache did not store session" ) );
5005 }
5006
5007 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5008 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
5009 ssl->handshake->flight != NULL )
5010 {
5011 /* Cancel handshake timer */
5012 ssl_set_timer( ssl, 0 );
5013
5014 /* Keep last flight around in case we need to resend it:
5015 * we need the handshake and transform structures for that */
5016 MBEDTLS_SSL_DEBUG_MSG( 3, ( "skip freeing handshake and transform" ) );
5017 }
5018 else
5019 #endif
5020 ssl_handshake_wrapup_free_hs_transform( ssl );
5021
5022 ssl->state++;
5023
5024 MBEDTLS_SSL_DEBUG_MSG( 3, ( "<= handshake wrapup" ) );
5025 }
5026
mbedtls_ssl_write_finished(mbedtls_ssl_context * ssl)5027 int mbedtls_ssl_write_finished( mbedtls_ssl_context *ssl )
5028 {
5029 int ret, hash_len;
5030
5031 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write finished" ) );
5032
5033 /*
5034 * Set the out_msg pointer to the correct location based on IV length
5035 */
5036 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_2 )
5037 {
5038 ssl->out_msg = ssl->out_iv + ssl->transform_negotiate->ivlen -
5039 ssl->transform_negotiate->fixed_ivlen;
5040 }
5041 else
5042 ssl->out_msg = ssl->out_iv;
5043
5044 ssl->handshake->calc_finished( ssl, ssl->out_msg + 4, ssl->conf->endpoint );
5045
5046 /*
5047 * RFC 5246 7.4.9 (Page 63) says 12 is the default length and ciphersuites
5048 * may define some other value. Currently (early 2016), no defined
5049 * ciphersuite does this (and this is unlikely to change as activity has
5050 * moved to TLS 1.3 now) so we can keep the hardcoded 12 here.
5051 */
5052 hash_len = ( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 ) ? 36 : 12;
5053
5054 #if defined(MBEDTLS_SSL_RENEGOTIATION)
5055 ssl->verify_data_len = hash_len;
5056 memcpy( ssl->own_verify_data, ssl->out_msg + 4, hash_len );
5057 #endif
5058
5059 ssl->out_msglen = 4 + hash_len;
5060 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
5061 ssl->out_msg[0] = MBEDTLS_SSL_HS_FINISHED;
5062
5063 /*
5064 * In case of session resuming, invert the client and server
5065 * ChangeCipherSpec messages order.
5066 */
5067 if( ssl->handshake->resume != 0 )
5068 {
5069 #if defined(MBEDTLS_SSL_CLI_C)
5070 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5071 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
5072 #endif
5073 #if defined(MBEDTLS_SSL_SRV_C)
5074 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
5075 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
5076 #endif
5077 }
5078 else
5079 ssl->state++;
5080
5081 /*
5082 * Switch to our negotiated transform and session parameters for outbound
5083 * data.
5084 */
5085 MBEDTLS_SSL_DEBUG_MSG( 3, ( "switching to new transform spec for outbound data" ) );
5086
5087 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5088 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5089 {
5090 unsigned char i;
5091
5092 /* Remember current epoch settings for resending */
5093 ssl->handshake->alt_transform_out = ssl->transform_out;
5094 memcpy( ssl->handshake->alt_out_ctr, ssl->out_ctr, 8 );
5095
5096 /* Set sequence_number to zero */
5097 memset( ssl->out_ctr + 2, 0, 6 );
5098
5099 /* Increment epoch */
5100 for( i = 2; i > 0; i-- )
5101 if( ++ssl->out_ctr[i - 1] != 0 )
5102 break;
5103
5104 /* The loop goes to its end iff the counter is wrapping */
5105 if( i == 0 )
5106 {
5107 MBEDTLS_SSL_DEBUG_MSG( 1, ( "DTLS epoch would wrap" ) );
5108 return( MBEDTLS_ERR_SSL_COUNTER_WRAPPING );
5109 }
5110 }
5111 else
5112 #endif /* MBEDTLS_SSL_PROTO_DTLS */
5113 memset( ssl->out_ctr, 0, 8 );
5114
5115 ssl->transform_out = ssl->transform_negotiate;
5116 ssl->session_out = ssl->session_negotiate;
5117
5118 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5119 if( mbedtls_ssl_hw_record_activate != NULL )
5120 {
5121 if( ( ret = mbedtls_ssl_hw_record_activate( ssl, MBEDTLS_SSL_CHANNEL_OUTBOUND ) ) != 0 )
5122 {
5123 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_activate", ret );
5124 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
5125 }
5126 }
5127 #endif
5128
5129 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5130 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5131 mbedtls_ssl_send_flight_completed( ssl );
5132 #endif
5133
5134 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
5135 {
5136 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
5137 return( ret );
5138 }
5139
5140 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write finished" ) );
5141
5142 return( 0 );
5143 }
5144
5145 #if defined(MBEDTLS_SSL_PROTO_SSL3)
5146 #define SSL_MAX_HASH_LEN 36
5147 #else
5148 #define SSL_MAX_HASH_LEN 12
5149 #endif
5150
mbedtls_ssl_parse_finished(mbedtls_ssl_context * ssl)5151 int mbedtls_ssl_parse_finished( mbedtls_ssl_context *ssl )
5152 {
5153 int ret;
5154 unsigned int hash_len;
5155 unsigned char buf[SSL_MAX_HASH_LEN];
5156
5157 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> parse finished" ) );
5158
5159 ssl->handshake->calc_finished( ssl, buf, ssl->conf->endpoint ^ 1 );
5160
5161 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
5162 {
5163 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
5164 return( ret );
5165 }
5166
5167 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_HANDSHAKE )
5168 {
5169 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5170 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
5171 }
5172
5173 /* There is currently no ciphersuite using another length with TLS 1.2 */
5174 #if defined(MBEDTLS_SSL_PROTO_SSL3)
5175 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
5176 hash_len = 36;
5177 else
5178 #endif
5179 hash_len = 12;
5180
5181 if( ssl->in_msg[0] != MBEDTLS_SSL_HS_FINISHED ||
5182 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) + hash_len )
5183 {
5184 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5185 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
5186 }
5187
5188 if( mbedtls_ssl_safer_memcmp( ssl->in_msg + mbedtls_ssl_hs_hdr_len( ssl ),
5189 buf, hash_len ) != 0 )
5190 {
5191 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad finished message" ) );
5192 return( MBEDTLS_ERR_SSL_BAD_HS_FINISHED );
5193 }
5194
5195 #if defined(MBEDTLS_SSL_RENEGOTIATION)
5196 ssl->verify_data_len = hash_len;
5197 memcpy( ssl->peer_verify_data, buf, hash_len );
5198 #endif
5199
5200 if( ssl->handshake->resume != 0 )
5201 {
5202 #if defined(MBEDTLS_SSL_CLI_C)
5203 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5204 ssl->state = MBEDTLS_SSL_CLIENT_CHANGE_CIPHER_SPEC;
5205 #endif
5206 #if defined(MBEDTLS_SSL_SRV_C)
5207 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
5208 ssl->state = MBEDTLS_SSL_HANDSHAKE_WRAPUP;
5209 #endif
5210 }
5211 else
5212 ssl->state++;
5213
5214 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5215 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5216 mbedtls_ssl_recv_flight_completed( ssl );
5217 #endif
5218
5219 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= parse finished" ) );
5220
5221 return( 0 );
5222 }
5223
ssl_handshake_params_init(mbedtls_ssl_handshake_params * handshake)5224 static void ssl_handshake_params_init( mbedtls_ssl_handshake_params *handshake )
5225 {
5226 memset( handshake, 0, sizeof( mbedtls_ssl_handshake_params ) );
5227
5228 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
5229 defined(MBEDTLS_SSL_PROTO_TLS1_1)
5230 mbedtls_md5_init( &handshake->fin_md5 );
5231 mbedtls_sha1_init( &handshake->fin_sha1 );
5232 mbedtls_md5_starts( &handshake->fin_md5 );
5233 mbedtls_sha1_starts( &handshake->fin_sha1 );
5234 #endif
5235 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
5236 #if defined(MBEDTLS_SHA256_C)
5237 mbedtls_sha256_init( &handshake->fin_sha256 );
5238 mbedtls_sha256_starts( &handshake->fin_sha256, 0 );
5239 #endif
5240 #if defined(MBEDTLS_SHA512_C)
5241 mbedtls_sha512_init( &handshake->fin_sha512 );
5242 mbedtls_sha512_starts( &handshake->fin_sha512, 1 );
5243 #endif
5244 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
5245
5246 handshake->update_checksum = ssl_update_checksum_start;
5247 handshake->sig_alg = MBEDTLS_SSL_HASH_SHA1;
5248
5249 #if defined(MBEDTLS_DHM_C)
5250 mbedtls_dhm_init( &handshake->dhm_ctx );
5251 #endif
5252 #if defined(MBEDTLS_ECDH_C)
5253 mbedtls_ecdh_init( &handshake->ecdh_ctx );
5254 #endif
5255 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
5256 mbedtls_ecjpake_init( &handshake->ecjpake_ctx );
5257 #if defined(MBEDTLS_SSL_CLI_C)
5258 handshake->ecjpake_cache = NULL;
5259 handshake->ecjpake_cache_len = 0;
5260 #endif
5261 #endif
5262
5263 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
5264 handshake->sni_authmode = MBEDTLS_SSL_VERIFY_UNSET;
5265 #endif
5266 }
5267
ssl_transform_init(mbedtls_ssl_transform * transform)5268 static void ssl_transform_init( mbedtls_ssl_transform *transform )
5269 {
5270 memset( transform, 0, sizeof(mbedtls_ssl_transform) );
5271
5272 mbedtls_cipher_init( &transform->cipher_ctx_enc );
5273 mbedtls_cipher_init( &transform->cipher_ctx_dec );
5274
5275 mbedtls_md_init( &transform->md_ctx_enc );
5276 mbedtls_md_init( &transform->md_ctx_dec );
5277 }
5278
mbedtls_ssl_session_init(mbedtls_ssl_session * session)5279 void mbedtls_ssl_session_init( mbedtls_ssl_session *session )
5280 {
5281 memset( session, 0, sizeof(mbedtls_ssl_session) );
5282 }
5283
ssl_handshake_init(mbedtls_ssl_context * ssl)5284 static int ssl_handshake_init( mbedtls_ssl_context *ssl )
5285 {
5286 /* Clear old handshake information if present */
5287 if( ssl->transform_negotiate )
5288 mbedtls_ssl_transform_free( ssl->transform_negotiate );
5289 if( ssl->session_negotiate )
5290 mbedtls_ssl_session_free( ssl->session_negotiate );
5291 if( ssl->handshake )
5292 mbedtls_ssl_handshake_free( ssl->handshake );
5293
5294 /*
5295 * Either the pointers are now NULL or cleared properly and can be freed.
5296 * Now allocate missing structures.
5297 */
5298 if( ssl->transform_negotiate == NULL )
5299 {
5300 ssl->transform_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_transform) );
5301 }
5302
5303 if( ssl->session_negotiate == NULL )
5304 {
5305 ssl->session_negotiate = mbedtls_calloc( 1, sizeof(mbedtls_ssl_session) );
5306 }
5307
5308 if( ssl->handshake == NULL )
5309 {
5310 ssl->handshake = mbedtls_calloc( 1, sizeof(mbedtls_ssl_handshake_params) );
5311 }
5312
5313 /* All pointers should exist and can be directly freed without issue */
5314 if( ssl->handshake == NULL ||
5315 ssl->transform_negotiate == NULL ||
5316 ssl->session_negotiate == NULL )
5317 {
5318 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc() of ssl sub-contexts failed" ) );
5319
5320 mbedtls_free( ssl->handshake );
5321 mbedtls_free( ssl->transform_negotiate );
5322 mbedtls_free( ssl->session_negotiate );
5323
5324 ssl->handshake = NULL;
5325 ssl->transform_negotiate = NULL;
5326 ssl->session_negotiate = NULL;
5327
5328 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5329 }
5330
5331 /* Initialize structures */
5332 mbedtls_ssl_session_init( ssl->session_negotiate );
5333 ssl_transform_init( ssl->transform_negotiate );
5334 ssl_handshake_params_init( ssl->handshake );
5335
5336 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5337 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5338 {
5339 ssl->handshake->alt_transform_out = ssl->transform_out;
5340
5341 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
5342 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_PREPARING;
5343 else
5344 ssl->handshake->retransmit_state = MBEDTLS_SSL_RETRANS_WAITING;
5345
5346 ssl_set_timer( ssl, 0 );
5347 }
5348 #endif
5349
5350 return( 0 );
5351 }
5352
5353 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
5354 /* Dummy cookie callbacks for defaults */
ssl_cookie_write_dummy(void * ctx,unsigned char ** p,unsigned char * end,const unsigned char * cli_id,size_t cli_id_len)5355 static int ssl_cookie_write_dummy( void *ctx,
5356 unsigned char **p, unsigned char *end,
5357 const unsigned char *cli_id, size_t cli_id_len )
5358 {
5359 ((void) ctx);
5360 ((void) p);
5361 ((void) end);
5362 ((void) cli_id);
5363 ((void) cli_id_len);
5364
5365 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
5366 }
5367
ssl_cookie_check_dummy(void * ctx,const unsigned char * cookie,size_t cookie_len,const unsigned char * cli_id,size_t cli_id_len)5368 static int ssl_cookie_check_dummy( void *ctx,
5369 const unsigned char *cookie, size_t cookie_len,
5370 const unsigned char *cli_id, size_t cli_id_len )
5371 {
5372 ((void) ctx);
5373 ((void) cookie);
5374 ((void) cookie_len);
5375 ((void) cli_id);
5376 ((void) cli_id_len);
5377
5378 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
5379 }
5380 #endif /* MBEDTLS_SSL_DTLS_HELLO_VERIFY && MBEDTLS_SSL_SRV_C */
5381
5382 /*
5383 * Initialize an SSL context
5384 */
mbedtls_ssl_init(mbedtls_ssl_context * ssl)5385 void mbedtls_ssl_init( mbedtls_ssl_context *ssl )
5386 {
5387 memset( ssl, 0, sizeof( mbedtls_ssl_context ) );
5388 }
5389
5390 /*
5391 * Setup an SSL context
5392 */
mbedtls_ssl_setup(mbedtls_ssl_context * ssl,const mbedtls_ssl_config * conf)5393 int mbedtls_ssl_setup( mbedtls_ssl_context *ssl,
5394 const mbedtls_ssl_config *conf )
5395 {
5396 int ret;
5397 const size_t len = MBEDTLS_SSL_BUFFER_LEN;
5398
5399 ssl->conf = conf;
5400
5401 /*
5402 * Prepare base structures
5403 */
5404 if( ( ssl-> in_buf = mbedtls_calloc( 1, len ) ) == NULL ||
5405 ( ssl->out_buf = mbedtls_calloc( 1, len ) ) == NULL )
5406 {
5407 MBEDTLS_SSL_DEBUG_MSG( 1, ( "alloc(%d bytes) failed", len ) );
5408 mbedtls_free( ssl->in_buf );
5409 ssl->in_buf = NULL;
5410 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5411 }
5412
5413 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5414 if( conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
5415 {
5416 ssl->out_hdr = ssl->out_buf;
5417 ssl->out_ctr = ssl->out_buf + 3;
5418 ssl->out_len = ssl->out_buf + 11;
5419 ssl->out_iv = ssl->out_buf + 13;
5420 ssl->out_msg = ssl->out_buf + 13;
5421
5422 ssl->in_hdr = ssl->in_buf;
5423 ssl->in_ctr = ssl->in_buf + 3;
5424 ssl->in_len = ssl->in_buf + 11;
5425 ssl->in_iv = ssl->in_buf + 13;
5426 ssl->in_msg = ssl->in_buf + 13;
5427 }
5428 else
5429 #endif
5430 {
5431 ssl->out_ctr = ssl->out_buf;
5432 ssl->out_hdr = ssl->out_buf + 8;
5433 ssl->out_len = ssl->out_buf + 11;
5434 ssl->out_iv = ssl->out_buf + 13;
5435 ssl->out_msg = ssl->out_buf + 13;
5436
5437 ssl->in_ctr = ssl->in_buf;
5438 ssl->in_hdr = ssl->in_buf + 8;
5439 ssl->in_len = ssl->in_buf + 11;
5440 ssl->in_iv = ssl->in_buf + 13;
5441 ssl->in_msg = ssl->in_buf + 13;
5442 }
5443
5444 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5445 return( ret );
5446
5447 return( 0 );
5448 }
5449
5450 /*
5451 * Reset an initialized and used SSL context for re-use while retaining
5452 * all application-set variables, function pointers and data.
5453 *
5454 * If partial is non-zero, keep data in the input buffer and client ID.
5455 * (Use when a DTLS client reconnects from the same port.)
5456 */
ssl_session_reset_int(mbedtls_ssl_context * ssl,int partial)5457 static int ssl_session_reset_int( mbedtls_ssl_context *ssl, int partial )
5458 {
5459 int ret;
5460
5461 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
5462
5463 /* Cancel any possibly running timer */
5464 ssl_set_timer( ssl, 0 );
5465
5466 #if defined(MBEDTLS_SSL_RENEGOTIATION)
5467 ssl->renego_status = MBEDTLS_SSL_INITIAL_HANDSHAKE;
5468 ssl->renego_records_seen = 0;
5469
5470 ssl->verify_data_len = 0;
5471 memset( ssl->own_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
5472 memset( ssl->peer_verify_data, 0, MBEDTLS_SSL_VERIFY_DATA_MAX_LEN );
5473 #endif
5474 ssl->secure_renegotiation = MBEDTLS_SSL_LEGACY_RENEGOTIATION;
5475
5476 ssl->in_offt = NULL;
5477
5478 ssl->in_msg = ssl->in_buf + 13;
5479 ssl->in_msgtype = 0;
5480 ssl->in_msglen = 0;
5481 if( partial == 0 )
5482 ssl->in_left = 0;
5483 #if defined(MBEDTLS_SSL_PROTO_DTLS)
5484 ssl->next_record_offset = 0;
5485 ssl->in_epoch = 0;
5486 #endif
5487 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
5488 ssl_dtls_replay_reset( ssl );
5489 #endif
5490
5491 ssl->in_hslen = 0;
5492 ssl->nb_zero = 0;
5493 ssl->record_read = 0;
5494
5495 ssl->out_msg = ssl->out_buf + 13;
5496 ssl->out_msgtype = 0;
5497 ssl->out_msglen = 0;
5498 ssl->out_left = 0;
5499 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
5500 if( ssl->split_done != MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED )
5501 ssl->split_done = 0;
5502 #endif
5503
5504 ssl->transform_in = NULL;
5505 ssl->transform_out = NULL;
5506
5507 memset( ssl->out_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
5508 if( partial == 0 )
5509 memset( ssl->in_buf, 0, MBEDTLS_SSL_BUFFER_LEN );
5510
5511 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
5512 if( mbedtls_ssl_hw_record_reset != NULL )
5513 {
5514 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_reset()" ) );
5515 if( ( ret = mbedtls_ssl_hw_record_reset( ssl ) ) != 0 )
5516 {
5517 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_hw_record_reset", ret );
5518 return( MBEDTLS_ERR_SSL_HW_ACCEL_FAILED );
5519 }
5520 }
5521 #endif
5522
5523 if( ssl->transform )
5524 {
5525 mbedtls_ssl_transform_free( ssl->transform );
5526 mbedtls_free( ssl->transform );
5527 ssl->transform = NULL;
5528 }
5529
5530 if( ssl->session )
5531 {
5532 mbedtls_ssl_session_free( ssl->session );
5533 mbedtls_free( ssl->session );
5534 ssl->session = NULL;
5535 }
5536
5537 #if defined(MBEDTLS_SSL_ALPN)
5538 ssl->alpn_chosen = NULL;
5539 #endif
5540
5541 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
5542 if( partial == 0 )
5543 {
5544 mbedtls_free( ssl->cli_id );
5545 ssl->cli_id = NULL;
5546 ssl->cli_id_len = 0;
5547 }
5548 #endif
5549
5550 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
5551 return( ret );
5552
5553 return( 0 );
5554 }
5555
5556 /*
5557 * Reset an initialized and used SSL context for re-use while retaining
5558 * all application-set variables, function pointers and data.
5559 */
mbedtls_ssl_session_reset(mbedtls_ssl_context * ssl)5560 int mbedtls_ssl_session_reset( mbedtls_ssl_context *ssl )
5561 {
5562 return( ssl_session_reset_int( ssl, 0 ) );
5563 }
5564
5565 /*
5566 * SSL set accessors
5567 */
mbedtls_ssl_conf_endpoint(mbedtls_ssl_config * conf,int endpoint)5568 void mbedtls_ssl_conf_endpoint( mbedtls_ssl_config *conf, int endpoint )
5569 {
5570 conf->endpoint = endpoint;
5571 }
5572
mbedtls_ssl_conf_transport(mbedtls_ssl_config * conf,int transport)5573 void mbedtls_ssl_conf_transport( mbedtls_ssl_config *conf, int transport )
5574 {
5575 conf->transport = transport;
5576 }
5577
5578 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
mbedtls_ssl_conf_dtls_anti_replay(mbedtls_ssl_config * conf,char mode)5579 void mbedtls_ssl_conf_dtls_anti_replay( mbedtls_ssl_config *conf, char mode )
5580 {
5581 conf->anti_replay = mode;
5582 }
5583 #endif
5584
5585 #if defined(MBEDTLS_SSL_DTLS_BADMAC_LIMIT)
mbedtls_ssl_conf_dtls_badmac_limit(mbedtls_ssl_config * conf,unsigned limit)5586 void mbedtls_ssl_conf_dtls_badmac_limit( mbedtls_ssl_config *conf, unsigned limit )
5587 {
5588 conf->badmac_limit = limit;
5589 }
5590 #endif
5591
5592 #if defined(MBEDTLS_SSL_PROTO_DTLS)
mbedtls_ssl_conf_handshake_timeout(mbedtls_ssl_config * conf,uint32_t min,uint32_t max)5593 void mbedtls_ssl_conf_handshake_timeout( mbedtls_ssl_config *conf, uint32_t min, uint32_t max )
5594 {
5595 conf->hs_timeout_min = min;
5596 conf->hs_timeout_max = max;
5597 }
5598 #endif
5599
mbedtls_ssl_conf_authmode(mbedtls_ssl_config * conf,int authmode)5600 void mbedtls_ssl_conf_authmode( mbedtls_ssl_config *conf, int authmode )
5601 {
5602 conf->authmode = authmode;
5603 }
5604
5605 #if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_ssl_conf_verify(mbedtls_ssl_config * conf,int (* f_vrfy)(void *,mbedtls_x509_crt *,int,uint32_t *),void * p_vrfy)5606 void mbedtls_ssl_conf_verify( mbedtls_ssl_config *conf,
5607 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
5608 void *p_vrfy )
5609 {
5610 conf->f_vrfy = f_vrfy;
5611 conf->p_vrfy = p_vrfy;
5612 }
5613 #endif /* MBEDTLS_X509_CRT_PARSE_C */
5614
mbedtls_ssl_conf_rng(mbedtls_ssl_config * conf,int (* f_rng)(void *,unsigned char *,size_t),void * p_rng)5615 void mbedtls_ssl_conf_rng( mbedtls_ssl_config *conf,
5616 int (*f_rng)(void *, unsigned char *, size_t),
5617 void *p_rng )
5618 {
5619 conf->f_rng = f_rng;
5620 conf->p_rng = p_rng;
5621 }
5622
mbedtls_ssl_conf_dbg(mbedtls_ssl_config * conf,void (* f_dbg)(void *,int,const char *,int,const char *),void * p_dbg)5623 void mbedtls_ssl_conf_dbg( mbedtls_ssl_config *conf,
5624 void (*f_dbg)(void *, int, const char *, int, const char *),
5625 void *p_dbg )
5626 {
5627 conf->f_dbg = f_dbg;
5628 conf->p_dbg = p_dbg;
5629 }
5630
mbedtls_ssl_set_bio(mbedtls_ssl_context * ssl,void * p_bio,mbedtls_ssl_send_t * f_send,mbedtls_ssl_recv_t * f_recv,mbedtls_ssl_recv_timeout_t * f_recv_timeout)5631 void mbedtls_ssl_set_bio( mbedtls_ssl_context *ssl,
5632 void *p_bio,
5633 mbedtls_ssl_send_t *f_send,
5634 mbedtls_ssl_recv_t *f_recv,
5635 mbedtls_ssl_recv_timeout_t *f_recv_timeout )
5636 {
5637 ssl->p_bio = p_bio;
5638 ssl->f_send = f_send;
5639 ssl->f_recv = f_recv;
5640 ssl->f_recv_timeout = f_recv_timeout;
5641 }
5642
mbedtls_ssl_conf_read_timeout(mbedtls_ssl_config * conf,uint32_t timeout)5643 void mbedtls_ssl_conf_read_timeout( mbedtls_ssl_config *conf, uint32_t timeout )
5644 {
5645 conf->read_timeout = timeout;
5646 }
5647
mbedtls_ssl_set_timer_cb(mbedtls_ssl_context * ssl,void * p_timer,mbedtls_ssl_set_timer_t * f_set_timer,mbedtls_ssl_get_timer_t * f_get_timer)5648 void mbedtls_ssl_set_timer_cb( mbedtls_ssl_context *ssl,
5649 void *p_timer,
5650 mbedtls_ssl_set_timer_t *f_set_timer,
5651 mbedtls_ssl_get_timer_t *f_get_timer )
5652 {
5653 ssl->p_timer = p_timer;
5654 ssl->f_set_timer = f_set_timer;
5655 ssl->f_get_timer = f_get_timer;
5656
5657 /* Make sure we start with no timer running */
5658 ssl_set_timer( ssl, 0 );
5659 }
5660
5661 #if defined(MBEDTLS_SSL_SRV_C)
mbedtls_ssl_conf_session_cache(mbedtls_ssl_config * conf,void * p_cache,int (* f_get_cache)(void *,mbedtls_ssl_session *),int (* f_set_cache)(void *,const mbedtls_ssl_session *))5662 void mbedtls_ssl_conf_session_cache( mbedtls_ssl_config *conf,
5663 void *p_cache,
5664 int (*f_get_cache)(void *, mbedtls_ssl_session *),
5665 int (*f_set_cache)(void *, const mbedtls_ssl_session *) )
5666 {
5667 conf->p_cache = p_cache;
5668 conf->f_get_cache = f_get_cache;
5669 conf->f_set_cache = f_set_cache;
5670 }
5671 #endif /* MBEDTLS_SSL_SRV_C */
5672
5673 #if defined(MBEDTLS_SSL_CLI_C)
mbedtls_ssl_set_session(mbedtls_ssl_context * ssl,const mbedtls_ssl_session * session)5674 int mbedtls_ssl_set_session( mbedtls_ssl_context *ssl, const mbedtls_ssl_session *session )
5675 {
5676 int ret;
5677
5678 if( ssl == NULL ||
5679 session == NULL ||
5680 ssl->session_negotiate == NULL ||
5681 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
5682 {
5683 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5684 }
5685
5686 if( ( ret = ssl_session_copy( ssl->session_negotiate, session ) ) != 0 )
5687 return( ret );
5688
5689 ssl->handshake->resume = 1;
5690
5691 return( 0 );
5692 }
5693 #endif /* MBEDTLS_SSL_CLI_C */
5694
mbedtls_ssl_conf_ciphersuites(mbedtls_ssl_config * conf,const int * ciphersuites)5695 void mbedtls_ssl_conf_ciphersuites( mbedtls_ssl_config *conf,
5696 const int *ciphersuites )
5697 {
5698 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] = ciphersuites;
5699 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] = ciphersuites;
5700 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] = ciphersuites;
5701 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] = ciphersuites;
5702 }
5703
mbedtls_ssl_conf_ciphersuites_for_version(mbedtls_ssl_config * conf,const int * ciphersuites,int major,int minor)5704 void mbedtls_ssl_conf_ciphersuites_for_version( mbedtls_ssl_config *conf,
5705 const int *ciphersuites,
5706 int major, int minor )
5707 {
5708 if( major != MBEDTLS_SSL_MAJOR_VERSION_3 )
5709 return;
5710
5711 if( minor < MBEDTLS_SSL_MINOR_VERSION_0 || minor > MBEDTLS_SSL_MINOR_VERSION_3 )
5712 return;
5713
5714 conf->ciphersuite_list[minor] = ciphersuites;
5715 }
5716
5717 #if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_ssl_conf_cert_profile(mbedtls_ssl_config * conf,const mbedtls_x509_crt_profile * profile)5718 void mbedtls_ssl_conf_cert_profile( mbedtls_ssl_config *conf,
5719 const mbedtls_x509_crt_profile *profile )
5720 {
5721 conf->cert_profile = profile;
5722 }
5723
5724 /* Append a new keycert entry to a (possibly empty) list */
ssl_append_key_cert(mbedtls_ssl_key_cert ** head,mbedtls_x509_crt * cert,mbedtls_pk_context * key)5725 static int ssl_append_key_cert( mbedtls_ssl_key_cert **head,
5726 mbedtls_x509_crt *cert,
5727 mbedtls_pk_context *key )
5728 {
5729 mbedtls_ssl_key_cert *new;
5730
5731 new = mbedtls_calloc( 1, sizeof( mbedtls_ssl_key_cert ) );
5732 if( new == NULL )
5733 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5734
5735 new->cert = cert;
5736 new->key = key;
5737 new->next = NULL;
5738
5739 /* Update head is the list was null, else add to the end */
5740 if( *head == NULL )
5741 {
5742 *head = new;
5743 }
5744 else
5745 {
5746 mbedtls_ssl_key_cert *cur = *head;
5747 while( cur->next != NULL )
5748 cur = cur->next;
5749 cur->next = new;
5750 }
5751
5752 return( 0 );
5753 }
5754
mbedtls_ssl_conf_own_cert(mbedtls_ssl_config * conf,mbedtls_x509_crt * own_cert,mbedtls_pk_context * pk_key)5755 int mbedtls_ssl_conf_own_cert( mbedtls_ssl_config *conf,
5756 mbedtls_x509_crt *own_cert,
5757 mbedtls_pk_context *pk_key )
5758 {
5759 return( ssl_append_key_cert( &conf->key_cert, own_cert, pk_key ) );
5760 }
5761
mbedtls_ssl_conf_ca_chain(mbedtls_ssl_config * conf,mbedtls_x509_crt * ca_chain,mbedtls_x509_crl * ca_crl)5762 void mbedtls_ssl_conf_ca_chain( mbedtls_ssl_config *conf,
5763 mbedtls_x509_crt *ca_chain,
5764 mbedtls_x509_crl *ca_crl )
5765 {
5766 conf->ca_chain = ca_chain;
5767 conf->ca_crl = ca_crl;
5768 }
5769 #endif /* MBEDTLS_X509_CRT_PARSE_C */
5770
5771 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
mbedtls_ssl_set_hs_own_cert(mbedtls_ssl_context * ssl,mbedtls_x509_crt * own_cert,mbedtls_pk_context * pk_key)5772 int mbedtls_ssl_set_hs_own_cert( mbedtls_ssl_context *ssl,
5773 mbedtls_x509_crt *own_cert,
5774 mbedtls_pk_context *pk_key )
5775 {
5776 return( ssl_append_key_cert( &ssl->handshake->sni_key_cert,
5777 own_cert, pk_key ) );
5778 }
5779
mbedtls_ssl_set_hs_ca_chain(mbedtls_ssl_context * ssl,mbedtls_x509_crt * ca_chain,mbedtls_x509_crl * ca_crl)5780 void mbedtls_ssl_set_hs_ca_chain( mbedtls_ssl_context *ssl,
5781 mbedtls_x509_crt *ca_chain,
5782 mbedtls_x509_crl *ca_crl )
5783 {
5784 ssl->handshake->sni_ca_chain = ca_chain;
5785 ssl->handshake->sni_ca_crl = ca_crl;
5786 }
5787
mbedtls_ssl_set_hs_authmode(mbedtls_ssl_context * ssl,int authmode)5788 void mbedtls_ssl_set_hs_authmode( mbedtls_ssl_context *ssl,
5789 int authmode )
5790 {
5791 ssl->handshake->sni_authmode = authmode;
5792 }
5793 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
5794
5795 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
5796 /*
5797 * Set EC J-PAKE password for current handshake
5798 */
mbedtls_ssl_set_hs_ecjpake_password(mbedtls_ssl_context * ssl,const unsigned char * pw,size_t pw_len)5799 int mbedtls_ssl_set_hs_ecjpake_password( mbedtls_ssl_context *ssl,
5800 const unsigned char *pw,
5801 size_t pw_len )
5802 {
5803 mbedtls_ecjpake_role role;
5804
5805 if( ssl->handshake == NULL || ssl->conf == NULL )
5806 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5807
5808 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
5809 role = MBEDTLS_ECJPAKE_SERVER;
5810 else
5811 role = MBEDTLS_ECJPAKE_CLIENT;
5812
5813 return( mbedtls_ecjpake_setup( &ssl->handshake->ecjpake_ctx,
5814 role,
5815 MBEDTLS_MD_SHA256,
5816 MBEDTLS_ECP_DP_SECP256R1,
5817 pw, pw_len ) );
5818 }
5819 #endif /* MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED */
5820
5821 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
mbedtls_ssl_conf_psk(mbedtls_ssl_config * conf,const unsigned char * psk,size_t psk_len,const unsigned char * psk_identity,size_t psk_identity_len)5822 int mbedtls_ssl_conf_psk( mbedtls_ssl_config *conf,
5823 const unsigned char *psk, size_t psk_len,
5824 const unsigned char *psk_identity, size_t psk_identity_len )
5825 {
5826 if( psk == NULL || psk_identity == NULL )
5827 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5828
5829 if( psk_len > MBEDTLS_PSK_MAX_LEN )
5830 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5831
5832 /* Identity len will be encoded on two bytes */
5833 if( ( psk_identity_len >> 16 ) != 0 ||
5834 psk_identity_len > MBEDTLS_SSL_MAX_CONTENT_LEN )
5835 {
5836 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5837 }
5838
5839 if( conf->psk != NULL || conf->psk_identity != NULL )
5840 {
5841 mbedtls_free( conf->psk );
5842 mbedtls_free( conf->psk_identity );
5843 conf->psk = NULL;
5844 conf->psk_identity = NULL;
5845 }
5846
5847 if( ( conf->psk = mbedtls_calloc( 1, psk_len ) ) == NULL ||
5848 ( conf->psk_identity = mbedtls_calloc( 1, psk_identity_len ) ) == NULL )
5849 {
5850 mbedtls_free( conf->psk );
5851 mbedtls_free( conf->psk_identity );
5852 conf->psk = NULL;
5853 conf->psk_identity = NULL;
5854 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5855 }
5856
5857 conf->psk_len = psk_len;
5858 conf->psk_identity_len = psk_identity_len;
5859
5860 memcpy( conf->psk, psk, conf->psk_len );
5861 memcpy( conf->psk_identity, psk_identity, conf->psk_identity_len );
5862
5863 return( 0 );
5864 }
5865
mbedtls_ssl_set_hs_psk(mbedtls_ssl_context * ssl,const unsigned char * psk,size_t psk_len)5866 int mbedtls_ssl_set_hs_psk( mbedtls_ssl_context *ssl,
5867 const unsigned char *psk, size_t psk_len )
5868 {
5869 if( psk == NULL || ssl->handshake == NULL )
5870 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5871
5872 if( psk_len > MBEDTLS_PSK_MAX_LEN )
5873 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5874
5875 if( ssl->handshake->psk != NULL )
5876 mbedtls_free( ssl->handshake->psk );
5877
5878 if( ( ssl->handshake->psk = mbedtls_calloc( 1, psk_len ) ) == NULL )
5879 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5880
5881 ssl->handshake->psk_len = psk_len;
5882 memcpy( ssl->handshake->psk, psk, ssl->handshake->psk_len );
5883
5884 return( 0 );
5885 }
5886
mbedtls_ssl_conf_psk_cb(mbedtls_ssl_config * conf,int (* f_psk)(void *,mbedtls_ssl_context *,const unsigned char *,size_t),void * p_psk)5887 void mbedtls_ssl_conf_psk_cb( mbedtls_ssl_config *conf,
5888 int (*f_psk)(void *, mbedtls_ssl_context *, const unsigned char *,
5889 size_t),
5890 void *p_psk )
5891 {
5892 conf->f_psk = f_psk;
5893 conf->p_psk = p_psk;
5894 }
5895 #endif /* MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED */
5896
5897 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
mbedtls_ssl_conf_dh_param(mbedtls_ssl_config * conf,const char * dhm_P,const char * dhm_G)5898 int mbedtls_ssl_conf_dh_param( mbedtls_ssl_config *conf, const char *dhm_P, const char *dhm_G )
5899 {
5900 int ret;
5901
5902 if( ( ret = mbedtls_mpi_read_string( &conf->dhm_P, 16, dhm_P ) ) != 0 ||
5903 ( ret = mbedtls_mpi_read_string( &conf->dhm_G, 16, dhm_G ) ) != 0 )
5904 {
5905 mbedtls_mpi_free( &conf->dhm_P );
5906 mbedtls_mpi_free( &conf->dhm_G );
5907 return( ret );
5908 }
5909
5910 return( 0 );
5911 }
5912
mbedtls_ssl_conf_dh_param_ctx(mbedtls_ssl_config * conf,mbedtls_dhm_context * dhm_ctx)5913 int mbedtls_ssl_conf_dh_param_ctx( mbedtls_ssl_config *conf, mbedtls_dhm_context *dhm_ctx )
5914 {
5915 int ret;
5916
5917 if( ( ret = mbedtls_mpi_copy( &conf->dhm_P, &dhm_ctx->P ) ) != 0 ||
5918 ( ret = mbedtls_mpi_copy( &conf->dhm_G, &dhm_ctx->G ) ) != 0 )
5919 {
5920 mbedtls_mpi_free( &conf->dhm_P );
5921 mbedtls_mpi_free( &conf->dhm_G );
5922 return( ret );
5923 }
5924
5925 return( 0 );
5926 }
5927 #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_SRV_C */
5928
5929 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
5930 /*
5931 * Set the minimum length for Diffie-Hellman parameters
5932 */
mbedtls_ssl_conf_dhm_min_bitlen(mbedtls_ssl_config * conf,unsigned int bitlen)5933 void mbedtls_ssl_conf_dhm_min_bitlen( mbedtls_ssl_config *conf,
5934 unsigned int bitlen )
5935 {
5936 conf->dhm_min_bitlen = bitlen;
5937 }
5938 #endif /* MBEDTLS_DHM_C && MBEDTLS_SSL_CLI_C */
5939
5940 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
5941 /*
5942 * Set allowed/preferred hashes for handshake signatures
5943 */
mbedtls_ssl_conf_sig_hashes(mbedtls_ssl_config * conf,const int * hashes)5944 void mbedtls_ssl_conf_sig_hashes( mbedtls_ssl_config *conf,
5945 const int *hashes )
5946 {
5947 conf->sig_hashes = hashes;
5948 }
5949 #endif
5950
5951 #if defined(MBEDTLS_ECP_C)
5952 /*
5953 * Set the allowed elliptic curves
5954 */
mbedtls_ssl_conf_curves(mbedtls_ssl_config * conf,const mbedtls_ecp_group_id * curve_list)5955 void mbedtls_ssl_conf_curves( mbedtls_ssl_config *conf,
5956 const mbedtls_ecp_group_id *curve_list )
5957 {
5958 conf->curve_list = curve_list;
5959 }
5960 #endif
5961
5962 #if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_ssl_set_hostname(mbedtls_ssl_context * ssl,const char * hostname)5963 int mbedtls_ssl_set_hostname( mbedtls_ssl_context *ssl, const char *hostname )
5964 {
5965 size_t hostname_len;
5966
5967 if( hostname == NULL )
5968 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5969
5970 hostname_len = strlen( hostname );
5971
5972 if( hostname_len + 1 == 0 )
5973 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5974
5975 if( hostname_len > MBEDTLS_SSL_MAX_HOST_NAME_LEN )
5976 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
5977
5978 ssl->hostname = mbedtls_calloc( 1, hostname_len + 1 );
5979
5980 if( ssl->hostname == NULL )
5981 return( MBEDTLS_ERR_SSL_ALLOC_FAILED );
5982
5983 memcpy( ssl->hostname, hostname, hostname_len );
5984
5985 ssl->hostname[hostname_len] = '\0';
5986
5987 return( 0 );
5988 }
5989 #endif
5990
5991 #if defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
mbedtls_ssl_conf_sni(mbedtls_ssl_config * conf,int (* f_sni)(void *,mbedtls_ssl_context *,const unsigned char *,size_t),void * p_sni)5992 void mbedtls_ssl_conf_sni( mbedtls_ssl_config *conf,
5993 int (*f_sni)(void *, mbedtls_ssl_context *,
5994 const unsigned char *, size_t),
5995 void *p_sni )
5996 {
5997 conf->f_sni = f_sni;
5998 conf->p_sni = p_sni;
5999 }
6000 #endif /* MBEDTLS_SSL_SERVER_NAME_INDICATION */
6001
6002 #if defined(MBEDTLS_SSL_ALPN)
mbedtls_ssl_conf_alpn_protocols(mbedtls_ssl_config * conf,const char ** protos)6003 int mbedtls_ssl_conf_alpn_protocols( mbedtls_ssl_config *conf, const char **protos )
6004 {
6005 size_t cur_len, tot_len;
6006 const char **p;
6007
6008 /*
6009 * "Empty strings MUST NOT be included and byte strings MUST NOT be
6010 * truncated". Check lengths now rather than later.
6011 */
6012 tot_len = 0;
6013 for( p = protos; *p != NULL; p++ )
6014 {
6015 cur_len = strlen( *p );
6016 tot_len += cur_len;
6017
6018 if( cur_len == 0 || cur_len > 255 || tot_len > 65535 )
6019 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6020 }
6021
6022 conf->alpn_list = protos;
6023
6024 return( 0 );
6025 }
6026
mbedtls_ssl_get_alpn_protocol(const mbedtls_ssl_context * ssl)6027 const char *mbedtls_ssl_get_alpn_protocol( const mbedtls_ssl_context *ssl )
6028 {
6029 return( ssl->alpn_chosen );
6030 }
6031 #endif /* MBEDTLS_SSL_ALPN */
6032
mbedtls_ssl_conf_max_version(mbedtls_ssl_config * conf,int major,int minor)6033 void mbedtls_ssl_conf_max_version( mbedtls_ssl_config *conf, int major, int minor )
6034 {
6035 conf->max_major_ver = major;
6036 conf->max_minor_ver = minor;
6037 }
6038
mbedtls_ssl_conf_min_version(mbedtls_ssl_config * conf,int major,int minor)6039 void mbedtls_ssl_conf_min_version( mbedtls_ssl_config *conf, int major, int minor )
6040 {
6041 conf->min_major_ver = major;
6042 conf->min_minor_ver = minor;
6043 }
6044
6045 #if defined(MBEDTLS_SSL_FALLBACK_SCSV) && defined(MBEDTLS_SSL_CLI_C)
mbedtls_ssl_conf_fallback(mbedtls_ssl_config * conf,char fallback)6046 void mbedtls_ssl_conf_fallback( mbedtls_ssl_config *conf, char fallback )
6047 {
6048 conf->fallback = fallback;
6049 }
6050 #endif
6051
6052 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
mbedtls_ssl_conf_encrypt_then_mac(mbedtls_ssl_config * conf,char etm)6053 void mbedtls_ssl_conf_encrypt_then_mac( mbedtls_ssl_config *conf, char etm )
6054 {
6055 conf->encrypt_then_mac = etm;
6056 }
6057 #endif
6058
6059 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
mbedtls_ssl_conf_extended_master_secret(mbedtls_ssl_config * conf,char ems)6060 void mbedtls_ssl_conf_extended_master_secret( mbedtls_ssl_config *conf, char ems )
6061 {
6062 conf->extended_ms = ems;
6063 }
6064 #endif
6065
6066 #if defined(MBEDTLS_ARC4_C)
mbedtls_ssl_conf_arc4_support(mbedtls_ssl_config * conf,char arc4)6067 void mbedtls_ssl_conf_arc4_support( mbedtls_ssl_config *conf, char arc4 )
6068 {
6069 conf->arc4_disabled = arc4;
6070 }
6071 #endif
6072
6073 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
mbedtls_ssl_conf_max_frag_len(mbedtls_ssl_config * conf,unsigned char mfl_code)6074 int mbedtls_ssl_conf_max_frag_len( mbedtls_ssl_config *conf, unsigned char mfl_code )
6075 {
6076 if( mfl_code >= MBEDTLS_SSL_MAX_FRAG_LEN_INVALID ||
6077 mfl_code_to_length[mfl_code] > MBEDTLS_SSL_MAX_CONTENT_LEN )
6078 {
6079 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6080 }
6081
6082 conf->mfl_code = mfl_code;
6083
6084 return( 0 );
6085 }
6086 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6087
6088 #if defined(MBEDTLS_SSL_TRUNCATED_HMAC)
mbedtls_ssl_conf_truncated_hmac(mbedtls_ssl_config * conf,int truncate)6089 void mbedtls_ssl_conf_truncated_hmac( mbedtls_ssl_config *conf, int truncate )
6090 {
6091 conf->trunc_hmac = truncate;
6092 }
6093 #endif /* MBEDTLS_SSL_TRUNCATED_HMAC */
6094
6095 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
mbedtls_ssl_conf_cbc_record_splitting(mbedtls_ssl_config * conf,char split)6096 void mbedtls_ssl_conf_cbc_record_splitting( mbedtls_ssl_config *conf, char split )
6097 {
6098 conf->cbc_record_splitting = split;
6099 }
6100 #endif
6101
mbedtls_ssl_conf_legacy_renegotiation(mbedtls_ssl_config * conf,int allow_legacy)6102 void mbedtls_ssl_conf_legacy_renegotiation( mbedtls_ssl_config *conf, int allow_legacy )
6103 {
6104 conf->allow_legacy_renegotiation = allow_legacy;
6105 }
6106
6107 #if defined(MBEDTLS_SSL_RENEGOTIATION)
mbedtls_ssl_conf_renegotiation(mbedtls_ssl_config * conf,int renegotiation)6108 void mbedtls_ssl_conf_renegotiation( mbedtls_ssl_config *conf, int renegotiation )
6109 {
6110 conf->disable_renegotiation = renegotiation;
6111 }
6112
mbedtls_ssl_conf_renegotiation_enforced(mbedtls_ssl_config * conf,int max_records)6113 void mbedtls_ssl_conf_renegotiation_enforced( mbedtls_ssl_config *conf, int max_records )
6114 {
6115 conf->renego_max_records = max_records;
6116 }
6117
mbedtls_ssl_conf_renegotiation_period(mbedtls_ssl_config * conf,const unsigned char period[8])6118 void mbedtls_ssl_conf_renegotiation_period( mbedtls_ssl_config *conf,
6119 const unsigned char period[8] )
6120 {
6121 memcpy( conf->renego_period, period, 8 );
6122 }
6123 #endif /* MBEDTLS_SSL_RENEGOTIATION */
6124
6125 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
6126 #if defined(MBEDTLS_SSL_CLI_C)
mbedtls_ssl_conf_session_tickets(mbedtls_ssl_config * conf,int use_tickets)6127 void mbedtls_ssl_conf_session_tickets( mbedtls_ssl_config *conf, int use_tickets )
6128 {
6129 conf->session_tickets = use_tickets;
6130 }
6131 #endif
6132
6133 #if defined(MBEDTLS_SSL_SRV_C)
mbedtls_ssl_conf_session_tickets_cb(mbedtls_ssl_config * conf,mbedtls_ssl_ticket_write_t * f_ticket_write,mbedtls_ssl_ticket_parse_t * f_ticket_parse,void * p_ticket)6134 void mbedtls_ssl_conf_session_tickets_cb( mbedtls_ssl_config *conf,
6135 mbedtls_ssl_ticket_write_t *f_ticket_write,
6136 mbedtls_ssl_ticket_parse_t *f_ticket_parse,
6137 void *p_ticket )
6138 {
6139 conf->f_ticket_write = f_ticket_write;
6140 conf->f_ticket_parse = f_ticket_parse;
6141 conf->p_ticket = p_ticket;
6142 }
6143 #endif
6144 #endif /* MBEDTLS_SSL_SESSION_TICKETS */
6145
6146 #if defined(MBEDTLS_SSL_EXPORT_KEYS)
mbedtls_ssl_conf_export_keys_cb(mbedtls_ssl_config * conf,mbedtls_ssl_export_keys_t * f_export_keys,void * p_export_keys)6147 void mbedtls_ssl_conf_export_keys_cb( mbedtls_ssl_config *conf,
6148 mbedtls_ssl_export_keys_t *f_export_keys,
6149 void *p_export_keys )
6150 {
6151 conf->f_export_keys = f_export_keys;
6152 conf->p_export_keys = p_export_keys;
6153 }
6154 #endif
6155
6156 /*
6157 * SSL get accessors
6158 */
mbedtls_ssl_get_bytes_avail(const mbedtls_ssl_context * ssl)6159 size_t mbedtls_ssl_get_bytes_avail( const mbedtls_ssl_context *ssl )
6160 {
6161 return( ssl->in_offt == NULL ? 0 : ssl->in_msglen );
6162 }
6163
mbedtls_ssl_get_verify_result(const mbedtls_ssl_context * ssl)6164 uint32_t mbedtls_ssl_get_verify_result( const mbedtls_ssl_context *ssl )
6165 {
6166 if( ssl->session != NULL )
6167 return( ssl->session->verify_result );
6168
6169 if( ssl->session_negotiate != NULL )
6170 return( ssl->session_negotiate->verify_result );
6171
6172 return( 0xFFFFFFFF );
6173 }
6174
mbedtls_ssl_get_ciphersuite(const mbedtls_ssl_context * ssl)6175 const char *mbedtls_ssl_get_ciphersuite( const mbedtls_ssl_context *ssl )
6176 {
6177 if( ssl == NULL || ssl->session == NULL )
6178 return( NULL );
6179
6180 return mbedtls_ssl_get_ciphersuite_name( ssl->session->ciphersuite );
6181 }
6182
mbedtls_ssl_get_version(const mbedtls_ssl_context * ssl)6183 const char *mbedtls_ssl_get_version( const mbedtls_ssl_context *ssl )
6184 {
6185 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6186 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6187 {
6188 switch( ssl->minor_ver )
6189 {
6190 case MBEDTLS_SSL_MINOR_VERSION_2:
6191 return( "DTLSv1.0" );
6192
6193 case MBEDTLS_SSL_MINOR_VERSION_3:
6194 return( "DTLSv1.2" );
6195
6196 default:
6197 return( "unknown (DTLS)" );
6198 }
6199 }
6200 #endif
6201
6202 switch( ssl->minor_ver )
6203 {
6204 case MBEDTLS_SSL_MINOR_VERSION_0:
6205 return( "SSLv3.0" );
6206
6207 case MBEDTLS_SSL_MINOR_VERSION_1:
6208 return( "TLSv1.0" );
6209
6210 case MBEDTLS_SSL_MINOR_VERSION_2:
6211 return( "TLSv1.1" );
6212
6213 case MBEDTLS_SSL_MINOR_VERSION_3:
6214 return( "TLSv1.2" );
6215
6216 default:
6217 return( "unknown" );
6218 }
6219 }
6220
mbedtls_ssl_get_record_expansion(const mbedtls_ssl_context * ssl)6221 int mbedtls_ssl_get_record_expansion( const mbedtls_ssl_context *ssl )
6222 {
6223 size_t transform_expansion;
6224 const mbedtls_ssl_transform *transform = ssl->transform_out;
6225
6226 #if defined(MBEDTLS_ZLIB_SUPPORT)
6227 if( ssl->session_out->compression != MBEDTLS_SSL_COMPRESS_NULL )
6228 return( MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE );
6229 #endif
6230
6231 if( transform == NULL )
6232 return( (int) mbedtls_ssl_hdr_len( ssl ) );
6233
6234 switch( mbedtls_cipher_get_cipher_mode( &transform->cipher_ctx_enc ) )
6235 {
6236 case MBEDTLS_MODE_GCM:
6237 case MBEDTLS_MODE_CCM:
6238 case MBEDTLS_MODE_STREAM:
6239 transform_expansion = transform->minlen;
6240 break;
6241
6242 case MBEDTLS_MODE_CBC:
6243 transform_expansion = transform->maclen
6244 + mbedtls_cipher_get_block_size( &transform->cipher_ctx_enc );
6245 break;
6246
6247 default:
6248 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
6249 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
6250 }
6251
6252 return( (int)( mbedtls_ssl_hdr_len( ssl ) + transform_expansion ) );
6253 }
6254
6255 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
mbedtls_ssl_get_max_frag_len(const mbedtls_ssl_context * ssl)6256 size_t mbedtls_ssl_get_max_frag_len( const mbedtls_ssl_context *ssl )
6257 {
6258 size_t max_len;
6259
6260 /*
6261 * Assume mfl_code is correct since it was checked when set
6262 */
6263 max_len = mfl_code_to_length[ssl->conf->mfl_code];
6264
6265 /*
6266 * Check if a smaller max length was negotiated
6267 */
6268 if( ssl->session_out != NULL &&
6269 mfl_code_to_length[ssl->session_out->mfl_code] < max_len )
6270 {
6271 max_len = mfl_code_to_length[ssl->session_out->mfl_code];
6272 }
6273
6274 return max_len;
6275 }
6276 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6277
6278 #if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_ssl_get_peer_cert(const mbedtls_ssl_context * ssl)6279 const mbedtls_x509_crt *mbedtls_ssl_get_peer_cert( const mbedtls_ssl_context *ssl )
6280 {
6281 if( ssl == NULL || ssl->session == NULL )
6282 return( NULL );
6283
6284 return( ssl->session->peer_cert );
6285 }
6286 #endif /* MBEDTLS_X509_CRT_PARSE_C */
6287
6288 #if defined(MBEDTLS_SSL_CLI_C)
mbedtls_ssl_get_session(const mbedtls_ssl_context * ssl,mbedtls_ssl_session * dst)6289 int mbedtls_ssl_get_session( const mbedtls_ssl_context *ssl, mbedtls_ssl_session *dst )
6290 {
6291 if( ssl == NULL ||
6292 dst == NULL ||
6293 ssl->session == NULL ||
6294 ssl->conf->endpoint != MBEDTLS_SSL_IS_CLIENT )
6295 {
6296 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6297 }
6298
6299 return( ssl_session_copy( dst, ssl->session ) );
6300 }
6301 #endif /* MBEDTLS_SSL_CLI_C */
6302
6303 /*
6304 * Perform a single step of the SSL handshake
6305 */
mbedtls_ssl_handshake_step(mbedtls_ssl_context * ssl)6306 int mbedtls_ssl_handshake_step( mbedtls_ssl_context *ssl )
6307 {
6308 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
6309
6310 if( ssl == NULL || ssl->conf == NULL )
6311 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6312
6313 #if defined(MBEDTLS_SSL_CLI_C)
6314 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
6315 ret = mbedtls_ssl_handshake_client_step( ssl );
6316 #endif
6317 #if defined(MBEDTLS_SSL_SRV_C)
6318 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
6319 ret = mbedtls_ssl_handshake_server_step( ssl );
6320 #endif
6321
6322 return( ret );
6323 }
6324
6325 /*
6326 * Perform the SSL handshake
6327 */
mbedtls_ssl_handshake(mbedtls_ssl_context * ssl)6328 int mbedtls_ssl_handshake( mbedtls_ssl_context *ssl )
6329 {
6330 int ret = 0;
6331
6332 if( ssl == NULL || ssl->conf == NULL )
6333 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6334
6335 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> handshake" ) );
6336
6337 while( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6338 {
6339 ret = mbedtls_ssl_handshake_step( ssl );
6340
6341 if( ret != 0 )
6342 break;
6343 }
6344
6345 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= handshake" ) );
6346
6347 return( ret );
6348 }
6349
6350 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6351 #if defined(MBEDTLS_SSL_SRV_C)
6352 /*
6353 * Write HelloRequest to request renegotiation on server
6354 */
ssl_write_hello_request(mbedtls_ssl_context * ssl)6355 static int ssl_write_hello_request( mbedtls_ssl_context *ssl )
6356 {
6357 int ret;
6358
6359 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write hello request" ) );
6360
6361 ssl->out_msglen = 4;
6362 ssl->out_msgtype = MBEDTLS_SSL_MSG_HANDSHAKE;
6363 ssl->out_msg[0] = MBEDTLS_SSL_HS_HELLO_REQUEST;
6364
6365 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
6366 {
6367 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
6368 return( ret );
6369 }
6370
6371 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write hello request" ) );
6372
6373 return( 0 );
6374 }
6375 #endif /* MBEDTLS_SSL_SRV_C */
6376
6377 /*
6378 * Actually renegotiate current connection, triggered by either:
6379 * - any side: calling mbedtls_ssl_renegotiate(),
6380 * - client: receiving a HelloRequest during mbedtls_ssl_read(),
6381 * - server: receiving any handshake message on server during mbedtls_ssl_read() after
6382 * the initial handshake is completed.
6383 * If the handshake doesn't complete due to waiting for I/O, it will continue
6384 * during the next calls to mbedtls_ssl_renegotiate() or mbedtls_ssl_read() respectively.
6385 */
ssl_start_renegotiation(mbedtls_ssl_context * ssl)6386 static int ssl_start_renegotiation( mbedtls_ssl_context *ssl )
6387 {
6388 int ret;
6389
6390 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> renegotiate" ) );
6391
6392 if( ( ret = ssl_handshake_init( ssl ) ) != 0 )
6393 return( ret );
6394
6395 /* RFC 6347 4.2.2: "[...] the HelloRequest will have message_seq = 0 and
6396 * the ServerHello will have message_seq = 1" */
6397 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6398 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
6399 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
6400 {
6401 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
6402 ssl->handshake->out_msg_seq = 1;
6403 else
6404 ssl->handshake->in_msg_seq = 1;
6405 }
6406 #endif
6407
6408 ssl->state = MBEDTLS_SSL_HELLO_REQUEST;
6409 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS;
6410
6411 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
6412 {
6413 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6414 return( ret );
6415 }
6416
6417 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= renegotiate" ) );
6418
6419 return( 0 );
6420 }
6421
6422 /*
6423 * Renegotiate current connection on client,
6424 * or request renegotiation on server
6425 */
mbedtls_ssl_renegotiate(mbedtls_ssl_context * ssl)6426 int mbedtls_ssl_renegotiate( mbedtls_ssl_context *ssl )
6427 {
6428 int ret = MBEDTLS_ERR_SSL_FEATURE_UNAVAILABLE;
6429
6430 if( ssl == NULL || ssl->conf == NULL )
6431 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6432
6433 #if defined(MBEDTLS_SSL_SRV_C)
6434 /* On server, just send the request */
6435 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER )
6436 {
6437 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6438 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6439
6440 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
6441
6442 /* Did we already try/start sending HelloRequest? */
6443 if( ssl->out_left != 0 )
6444 return( mbedtls_ssl_flush_output( ssl ) );
6445
6446 return( ssl_write_hello_request( ssl ) );
6447 }
6448 #endif /* MBEDTLS_SSL_SRV_C */
6449
6450 #if defined(MBEDTLS_SSL_CLI_C)
6451 /*
6452 * On client, either start the renegotiation process or,
6453 * if already in progress, continue the handshake
6454 */
6455 if( ssl->renego_status != MBEDTLS_SSL_RENEGOTIATION_IN_PROGRESS )
6456 {
6457 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6458 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6459
6460 if( ( ret = ssl_start_renegotiation( ssl ) ) != 0 )
6461 {
6462 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
6463 return( ret );
6464 }
6465 }
6466 else
6467 {
6468 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
6469 {
6470 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6471 return( ret );
6472 }
6473 }
6474 #endif /* MBEDTLS_SSL_CLI_C */
6475
6476 return( ret );
6477 }
6478
6479 /*
6480 * Check record counters and renegotiate if they're above the limit.
6481 */
ssl_check_ctr_renegotiate(mbedtls_ssl_context * ssl)6482 static int ssl_check_ctr_renegotiate( mbedtls_ssl_context *ssl )
6483 {
6484 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER ||
6485 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING ||
6486 ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED )
6487 {
6488 return( 0 );
6489 }
6490
6491 if( memcmp( ssl->in_ctr, ssl->conf->renego_period, 8 ) <= 0 &&
6492 memcmp( ssl->out_ctr, ssl->conf->renego_period, 8 ) <= 0 )
6493 {
6494 return( 0 );
6495 }
6496
6497 MBEDTLS_SSL_DEBUG_MSG( 1, ( "record counter limit reached: renegotiate" ) );
6498 return( mbedtls_ssl_renegotiate( ssl ) );
6499 }
6500 #endif /* MBEDTLS_SSL_RENEGOTIATION */
6501
6502 /*
6503 * Receive application data decrypted from the SSL layer
6504 */
mbedtls_ssl_read(mbedtls_ssl_context * ssl,unsigned char * buf,size_t len)6505 int mbedtls_ssl_read( mbedtls_ssl_context *ssl, unsigned char *buf, size_t len )
6506 {
6507 int ret, record_read = 0;
6508 size_t n;
6509
6510 if( ssl == NULL || ssl->conf == NULL )
6511 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6512
6513 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> read" ) );
6514
6515 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6516 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6517 {
6518 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
6519 return( ret );
6520
6521 if( ssl->handshake != NULL &&
6522 ssl->handshake->retransmit_state == MBEDTLS_SSL_RETRANS_SENDING )
6523 {
6524 if( ( ret = mbedtls_ssl_resend( ssl ) ) != 0 )
6525 return( ret );
6526 }
6527 }
6528 #endif
6529
6530 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6531 if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
6532 {
6533 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
6534 return( ret );
6535 }
6536 #endif
6537
6538 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6539 {
6540 ret = mbedtls_ssl_handshake( ssl );
6541 if( ret == MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO )
6542 {
6543 record_read = 1;
6544 }
6545 else if( ret != 0 )
6546 {
6547 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6548 return( ret );
6549 }
6550 }
6551
6552 if( ssl->in_offt == NULL )
6553 {
6554 /* Start timer if not already running */
6555 if( ssl->f_get_timer != NULL &&
6556 ssl->f_get_timer( ssl->p_timer ) == -1 )
6557 {
6558 ssl_set_timer( ssl, ssl->conf->read_timeout );
6559 }
6560
6561 if( ! record_read )
6562 {
6563 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
6564 {
6565 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
6566 return( 0 );
6567
6568 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
6569 return( ret );
6570 }
6571 }
6572
6573 if( ssl->in_msglen == 0 &&
6574 ssl->in_msgtype == MBEDTLS_SSL_MSG_APPLICATION_DATA )
6575 {
6576 /*
6577 * OpenSSL sends empty messages to randomize the IV
6578 */
6579 if( ( ret = mbedtls_ssl_read_record( ssl ) ) != 0 )
6580 {
6581 if( ret == MBEDTLS_ERR_SSL_CONN_EOF )
6582 return( 0 );
6583
6584 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_read_record", ret );
6585 return( ret );
6586 }
6587 }
6588
6589 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6590 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_HANDSHAKE )
6591 {
6592 MBEDTLS_SSL_DEBUG_MSG( 1, ( "received handshake message" ) );
6593
6594 #if defined(MBEDTLS_SSL_CLI_C)
6595 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT &&
6596 ( ssl->in_msg[0] != MBEDTLS_SSL_HS_HELLO_REQUEST ||
6597 ssl->in_hslen != mbedtls_ssl_hs_hdr_len( ssl ) ) )
6598 {
6599 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not HelloRequest)" ) );
6600
6601 /* With DTLS, drop the packet (probably from last handshake) */
6602 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6603 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6604 return( MBEDTLS_ERR_SSL_WANT_READ );
6605 #endif
6606 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6607 }
6608
6609 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
6610 ssl->in_msg[0] != MBEDTLS_SSL_HS_CLIENT_HELLO )
6611 {
6612 MBEDTLS_SSL_DEBUG_MSG( 1, ( "handshake received (not ClientHello)" ) );
6613
6614 /* With DTLS, drop the packet (probably from last handshake) */
6615 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6616 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6617 return( MBEDTLS_ERR_SSL_WANT_READ );
6618 #endif
6619 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6620 }
6621 #endif
6622
6623 if( ssl->conf->disable_renegotiation == MBEDTLS_SSL_RENEGOTIATION_DISABLED ||
6624 ( ssl->secure_renegotiation == MBEDTLS_SSL_LEGACY_RENEGOTIATION &&
6625 ssl->conf->allow_legacy_renegotiation ==
6626 MBEDTLS_SSL_LEGACY_NO_RENEGOTIATION ) )
6627 {
6628 MBEDTLS_SSL_DEBUG_MSG( 3, ( "refusing renegotiation, sending alert" ) );
6629
6630 #if defined(MBEDTLS_SSL_PROTO_SSL3)
6631 if( ssl->minor_ver == MBEDTLS_SSL_MINOR_VERSION_0 )
6632 {
6633 /*
6634 * SSLv3 does not have a "no_renegotiation" alert
6635 */
6636 if( ( ret = mbedtls_ssl_send_fatal_handshake_failure( ssl ) ) != 0 )
6637 return( ret );
6638 }
6639 else
6640 #endif /* MBEDTLS_SSL_PROTO_SSL3 */
6641 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1) || \
6642 defined(MBEDTLS_SSL_PROTO_TLS1_2)
6643 if( ssl->minor_ver >= MBEDTLS_SSL_MINOR_VERSION_1 )
6644 {
6645 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
6646 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
6647 MBEDTLS_SSL_ALERT_MSG_NO_RENEGOTIATION ) ) != 0 )
6648 {
6649 return( ret );
6650 }
6651 }
6652 else
6653 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 ||
6654 MBEDTLS_SSL_PROTO_TLS1_2 */
6655 {
6656 MBEDTLS_SSL_DEBUG_MSG( 1, ( "should never happen" ) );
6657 return( MBEDTLS_ERR_SSL_INTERNAL_ERROR );
6658 }
6659 }
6660 else
6661 {
6662 /* DTLS clients need to know renego is server-initiated */
6663 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6664 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM &&
6665 ssl->conf->endpoint == MBEDTLS_SSL_IS_CLIENT )
6666 {
6667 ssl->renego_status = MBEDTLS_SSL_RENEGOTIATION_PENDING;
6668 }
6669 #endif
6670 ret = ssl_start_renegotiation( ssl );
6671 if( ret == MBEDTLS_ERR_SSL_WAITING_SERVER_HELLO_RENEGO )
6672 {
6673 record_read = 1;
6674 }
6675 else if( ret != 0 )
6676 {
6677 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_start_renegotiation", ret );
6678 return( ret );
6679 }
6680 }
6681
6682 /* If a non-handshake record was read during renego, fallthrough,
6683 * else tell the user they should call mbedtls_ssl_read() again */
6684 if( ! record_read )
6685 return( MBEDTLS_ERR_SSL_WANT_READ );
6686 }
6687 else if( ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
6688 {
6689
6690 if( ssl->conf->renego_max_records >= 0 )
6691 {
6692 if( ++ssl->renego_records_seen > ssl->conf->renego_max_records )
6693 {
6694 MBEDTLS_SSL_DEBUG_MSG( 1, ( "renegotiation requested, "
6695 "but not honored by client" ) );
6696 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6697 }
6698 }
6699 }
6700 #endif /* MBEDTLS_SSL_RENEGOTIATION */
6701
6702 /* Fatal and closure alerts handled by mbedtls_ssl_read_record() */
6703 if( ssl->in_msgtype == MBEDTLS_SSL_MSG_ALERT )
6704 {
6705 MBEDTLS_SSL_DEBUG_MSG( 2, ( "ignoring non-fatal non-closure alert" ) );
6706 return( MBEDTLS_ERR_SSL_WANT_READ );
6707 }
6708
6709 if( ssl->in_msgtype != MBEDTLS_SSL_MSG_APPLICATION_DATA )
6710 {
6711 MBEDTLS_SSL_DEBUG_MSG( 1, ( "bad application data message" ) );
6712 return( MBEDTLS_ERR_SSL_UNEXPECTED_MESSAGE );
6713 }
6714
6715 ssl->in_offt = ssl->in_msg;
6716
6717 /* We're going to return something now, cancel timer,
6718 * except if handshake (renegotiation) is in progress */
6719 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
6720 ssl_set_timer( ssl, 0 );
6721
6722 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6723 /* If we requested renego but received AppData, resend HelloRequest.
6724 * Do it now, after setting in_offt, to avoid taking this branch
6725 * again if ssl_write_hello_request() returns WANT_WRITE */
6726 #if defined(MBEDTLS_SSL_SRV_C) && defined(MBEDTLS_SSL_RENEGOTIATION)
6727 if( ssl->conf->endpoint == MBEDTLS_SSL_IS_SERVER &&
6728 ssl->renego_status == MBEDTLS_SSL_RENEGOTIATION_PENDING )
6729 {
6730 if( ( ret = ssl_resend_hello_request( ssl ) ) != 0 )
6731 {
6732 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_resend_hello_request", ret );
6733 return( ret );
6734 }
6735 }
6736 #endif /* MBEDTLS_SSL_SRV_C && MBEDTLS_SSL_RENEGOTIATION */
6737 #endif
6738 }
6739
6740 n = ( len < ssl->in_msglen )
6741 ? len : ssl->in_msglen;
6742
6743 memcpy( buf, ssl->in_offt, n );
6744 ssl->in_msglen -= n;
6745
6746 if( ssl->in_msglen == 0 )
6747 /* all bytes consumed */
6748 ssl->in_offt = NULL;
6749 else
6750 /* more data available */
6751 ssl->in_offt += n;
6752
6753 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= read" ) );
6754
6755 return( (int) n );
6756 }
6757
6758 /*
6759 * Send application data to be encrypted by the SSL layer,
6760 * taking care of max fragment length and buffer size
6761 */
ssl_write_real(mbedtls_ssl_context * ssl,const unsigned char * buf,size_t len)6762 static int ssl_write_real( mbedtls_ssl_context *ssl,
6763 const unsigned char *buf, size_t len )
6764 {
6765 int ret;
6766 #if defined(MBEDTLS_SSL_MAX_FRAGMENT_LENGTH)
6767 size_t max_len = mbedtls_ssl_get_max_frag_len( ssl );
6768
6769 if( len > max_len )
6770 {
6771 #if defined(MBEDTLS_SSL_PROTO_DTLS)
6772 if( ssl->conf->transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
6773 {
6774 MBEDTLS_SSL_DEBUG_MSG( 1, ( "fragment larger than the (negotiated) "
6775 "maximum fragment length: %d > %d",
6776 len, max_len ) );
6777 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6778 }
6779 else
6780 #endif
6781 len = max_len;
6782 }
6783 #endif /* MBEDTLS_SSL_MAX_FRAGMENT_LENGTH */
6784
6785 if( ssl->out_left != 0 )
6786 {
6787 if( ( ret = mbedtls_ssl_flush_output( ssl ) ) != 0 )
6788 {
6789 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_flush_output", ret );
6790 return( ret );
6791 }
6792 }
6793 else
6794 {
6795 ssl->out_msglen = len;
6796 ssl->out_msgtype = MBEDTLS_SSL_MSG_APPLICATION_DATA;
6797 memcpy( ssl->out_msg, buf, len );
6798
6799 if( ( ret = mbedtls_ssl_write_record( ssl ) ) != 0 )
6800 {
6801 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_write_record", ret );
6802 return( ret );
6803 }
6804 }
6805
6806 return( (int) len );
6807 }
6808
6809 /*
6810 * Write application data, doing 1/n-1 splitting if necessary.
6811 *
6812 * With non-blocking I/O, ssl_write_real() may return WANT_WRITE,
6813 * then the caller will call us again with the same arguments, so
6814 * remember wether we already did the split or not.
6815 */
6816 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
ssl_write_split(mbedtls_ssl_context * ssl,const unsigned char * buf,size_t len)6817 static int ssl_write_split( mbedtls_ssl_context *ssl,
6818 const unsigned char *buf, size_t len )
6819 {
6820 int ret;
6821
6822 if( ssl->conf->cbc_record_splitting ==
6823 MBEDTLS_SSL_CBC_RECORD_SPLITTING_DISABLED ||
6824 len <= 1 ||
6825 ssl->minor_ver > MBEDTLS_SSL_MINOR_VERSION_1 ||
6826 mbedtls_cipher_get_cipher_mode( &ssl->transform_out->cipher_ctx_enc )
6827 != MBEDTLS_MODE_CBC )
6828 {
6829 return( ssl_write_real( ssl, buf, len ) );
6830 }
6831
6832 if( ssl->split_done == 0 )
6833 {
6834 if( ( ret = ssl_write_real( ssl, buf, 1 ) ) <= 0 )
6835 return( ret );
6836 ssl->split_done = 1;
6837 }
6838
6839 if( ( ret = ssl_write_real( ssl, buf + 1, len - 1 ) ) <= 0 )
6840 return( ret );
6841 ssl->split_done = 0;
6842
6843 return( ret + 1 );
6844 }
6845 #endif /* MBEDTLS_SSL_CBC_RECORD_SPLITTING */
6846
6847 /*
6848 * Write application data (public-facing wrapper)
6849 */
mbedtls_ssl_write(mbedtls_ssl_context * ssl,const unsigned char * buf,size_t len)6850 int mbedtls_ssl_write( mbedtls_ssl_context *ssl, const unsigned char *buf, size_t len )
6851 {
6852 int ret;
6853
6854 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write" ) );
6855
6856 if( ssl == NULL || ssl->conf == NULL )
6857 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6858
6859 #if defined(MBEDTLS_SSL_RENEGOTIATION)
6860 if( ( ret = ssl_check_ctr_renegotiate( ssl ) ) != 0 )
6861 {
6862 MBEDTLS_SSL_DEBUG_RET( 1, "ssl_check_ctr_renegotiate", ret );
6863 return( ret );
6864 }
6865 #endif
6866
6867 if( ssl->state != MBEDTLS_SSL_HANDSHAKE_OVER )
6868 {
6869 if( ( ret = mbedtls_ssl_handshake( ssl ) ) != 0 )
6870 {
6871 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_handshake", ret );
6872 return( ret );
6873 }
6874 }
6875
6876 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
6877 ret = ssl_write_split( ssl, buf, len );
6878 #else
6879 ret = ssl_write_real( ssl, buf, len );
6880 #endif
6881
6882 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write" ) );
6883
6884 return( ret );
6885 }
6886
6887 /*
6888 * Notify the peer that the connection is being closed
6889 */
mbedtls_ssl_close_notify(mbedtls_ssl_context * ssl)6890 int mbedtls_ssl_close_notify( mbedtls_ssl_context *ssl )
6891 {
6892 int ret;
6893
6894 if( ssl == NULL || ssl->conf == NULL )
6895 return( MBEDTLS_ERR_SSL_BAD_INPUT_DATA );
6896
6897 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> write close notify" ) );
6898
6899 if( ssl->out_left != 0 )
6900 return( mbedtls_ssl_flush_output( ssl ) );
6901
6902 if( ssl->state == MBEDTLS_SSL_HANDSHAKE_OVER )
6903 {
6904 if( ( ret = mbedtls_ssl_send_alert_message( ssl,
6905 MBEDTLS_SSL_ALERT_LEVEL_WARNING,
6906 MBEDTLS_SSL_ALERT_MSG_CLOSE_NOTIFY ) ) != 0 )
6907 {
6908 MBEDTLS_SSL_DEBUG_RET( 1, "mbedtls_ssl_send_alert_message", ret );
6909 return( ret );
6910 }
6911 }
6912
6913 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= write close notify" ) );
6914
6915 return( 0 );
6916 }
6917
mbedtls_ssl_transform_free(mbedtls_ssl_transform * transform)6918 void mbedtls_ssl_transform_free( mbedtls_ssl_transform *transform )
6919 {
6920 if( transform == NULL )
6921 return;
6922
6923 #if defined(MBEDTLS_ZLIB_SUPPORT)
6924 deflateEnd( &transform->ctx_deflate );
6925 inflateEnd( &transform->ctx_inflate );
6926 #endif
6927
6928 mbedtls_cipher_free( &transform->cipher_ctx_enc );
6929 mbedtls_cipher_free( &transform->cipher_ctx_dec );
6930
6931 mbedtls_md_free( &transform->md_ctx_enc );
6932 mbedtls_md_free( &transform->md_ctx_dec );
6933
6934 mbedtls_zeroize( transform, sizeof( mbedtls_ssl_transform ) );
6935 }
6936
6937 #if defined(MBEDTLS_X509_CRT_PARSE_C)
ssl_key_cert_free(mbedtls_ssl_key_cert * key_cert)6938 static void ssl_key_cert_free( mbedtls_ssl_key_cert *key_cert )
6939 {
6940 mbedtls_ssl_key_cert *cur = key_cert, *next;
6941
6942 while( cur != NULL )
6943 {
6944 next = cur->next;
6945 mbedtls_free( cur );
6946 cur = next;
6947 }
6948 }
6949 #endif /* MBEDTLS_X509_CRT_PARSE_C */
6950
mbedtls_ssl_handshake_free(mbedtls_ssl_handshake_params * handshake)6951 void mbedtls_ssl_handshake_free( mbedtls_ssl_handshake_params *handshake )
6952 {
6953 if( handshake == NULL )
6954 return;
6955
6956 #if defined(MBEDTLS_SSL_PROTO_SSL3) || defined(MBEDTLS_SSL_PROTO_TLS1) || \
6957 defined(MBEDTLS_SSL_PROTO_TLS1_1)
6958 mbedtls_md5_free( &handshake->fin_md5 );
6959 mbedtls_sha1_free( &handshake->fin_sha1 );
6960 #endif
6961 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
6962 #if defined(MBEDTLS_SHA256_C)
6963 mbedtls_sha256_free( &handshake->fin_sha256 );
6964 #endif
6965 #if defined(MBEDTLS_SHA512_C)
6966 mbedtls_sha512_free( &handshake->fin_sha512 );
6967 #endif
6968 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
6969
6970 #if defined(MBEDTLS_DHM_C)
6971 mbedtls_dhm_free( &handshake->dhm_ctx );
6972 #endif
6973 #if defined(MBEDTLS_ECDH_C)
6974 mbedtls_ecdh_free( &handshake->ecdh_ctx );
6975 #endif
6976 #if defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
6977 mbedtls_ecjpake_free( &handshake->ecjpake_ctx );
6978 #if defined(MBEDTLS_SSL_CLI_C)
6979 mbedtls_free( handshake->ecjpake_cache );
6980 handshake->ecjpake_cache = NULL;
6981 handshake->ecjpake_cache_len = 0;
6982 #endif
6983 #endif
6984
6985 #if defined(MBEDTLS_ECDH_C) || defined(MBEDTLS_ECDSA_C) || \
6986 defined(MBEDTLS_KEY_EXCHANGE_ECJPAKE_ENABLED)
6987 /* explicit void pointer cast for buggy MS compiler */
6988 mbedtls_free( (void *) handshake->curves );
6989 #endif
6990
6991 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
6992 if( handshake->psk != NULL )
6993 {
6994 mbedtls_zeroize( handshake->psk, handshake->psk_len );
6995 mbedtls_free( handshake->psk );
6996 }
6997 #endif
6998
6999 #if defined(MBEDTLS_X509_CRT_PARSE_C) && \
7000 defined(MBEDTLS_SSL_SERVER_NAME_INDICATION)
7001 /*
7002 * Free only the linked list wrapper, not the keys themselves
7003 * since the belong to the SNI callback
7004 */
7005 if( handshake->sni_key_cert != NULL )
7006 {
7007 mbedtls_ssl_key_cert *cur = handshake->sni_key_cert, *next;
7008
7009 while( cur != NULL )
7010 {
7011 next = cur->next;
7012 mbedtls_free( cur );
7013 cur = next;
7014 }
7015 }
7016 #endif /* MBEDTLS_X509_CRT_PARSE_C && MBEDTLS_SSL_SERVER_NAME_INDICATION */
7017
7018 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7019 mbedtls_free( handshake->verify_cookie );
7020 mbedtls_free( handshake->hs_msg );
7021 ssl_flight_free( handshake->flight );
7022 #endif
7023
7024 mbedtls_zeroize( handshake, sizeof( mbedtls_ssl_handshake_params ) );
7025 }
7026
mbedtls_ssl_session_free(mbedtls_ssl_session * session)7027 void mbedtls_ssl_session_free( mbedtls_ssl_session *session )
7028 {
7029 if( session == NULL )
7030 return;
7031
7032 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7033 if( session->peer_cert != NULL )
7034 {
7035 mbedtls_x509_crt_free( session->peer_cert );
7036 mbedtls_free( session->peer_cert );
7037 }
7038 #endif
7039
7040 #if defined(MBEDTLS_SSL_SESSION_TICKETS) && defined(MBEDTLS_SSL_CLI_C)
7041 mbedtls_free( session->ticket );
7042 #endif
7043
7044 mbedtls_zeroize( session, sizeof( mbedtls_ssl_session ) );
7045 }
7046
7047 /*
7048 * Free an SSL context
7049 */
mbedtls_ssl_free(mbedtls_ssl_context * ssl)7050 void mbedtls_ssl_free( mbedtls_ssl_context *ssl )
7051 {
7052 if( ssl == NULL )
7053 return;
7054
7055 MBEDTLS_SSL_DEBUG_MSG( 2, ( "=> free" ) );
7056
7057 if( ssl->out_buf != NULL )
7058 {
7059 mbedtls_zeroize( ssl->out_buf, MBEDTLS_SSL_BUFFER_LEN );
7060 mbedtls_free( ssl->out_buf );
7061 }
7062
7063 if( ssl->in_buf != NULL )
7064 {
7065 mbedtls_zeroize( ssl->in_buf, MBEDTLS_SSL_BUFFER_LEN );
7066 mbedtls_free( ssl->in_buf );
7067 }
7068
7069 #if defined(MBEDTLS_ZLIB_SUPPORT)
7070 if( ssl->compress_buf != NULL )
7071 {
7072 mbedtls_zeroize( ssl->compress_buf, MBEDTLS_SSL_BUFFER_LEN );
7073 mbedtls_free( ssl->compress_buf );
7074 }
7075 #endif
7076
7077 if( ssl->transform )
7078 {
7079 mbedtls_ssl_transform_free( ssl->transform );
7080 mbedtls_free( ssl->transform );
7081 }
7082
7083 if( ssl->handshake )
7084 {
7085 mbedtls_ssl_handshake_free( ssl->handshake );
7086 mbedtls_ssl_transform_free( ssl->transform_negotiate );
7087 mbedtls_ssl_session_free( ssl->session_negotiate );
7088
7089 mbedtls_free( ssl->handshake );
7090 mbedtls_free( ssl->transform_negotiate );
7091 mbedtls_free( ssl->session_negotiate );
7092 }
7093
7094 if( ssl->session )
7095 {
7096 mbedtls_ssl_session_free( ssl->session );
7097 mbedtls_free( ssl->session );
7098 }
7099
7100 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7101 if( ssl->hostname != NULL )
7102 {
7103 mbedtls_zeroize( ssl->hostname, strlen( ssl->hostname ) );
7104 mbedtls_free( ssl->hostname );
7105 }
7106 #endif
7107
7108 #if defined(MBEDTLS_SSL_HW_RECORD_ACCEL)
7109 if( mbedtls_ssl_hw_record_finish != NULL )
7110 {
7111 MBEDTLS_SSL_DEBUG_MSG( 2, ( "going for mbedtls_ssl_hw_record_finish()" ) );
7112 mbedtls_ssl_hw_record_finish( ssl );
7113 }
7114 #endif
7115
7116 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
7117 mbedtls_free( ssl->cli_id );
7118 #endif
7119
7120 MBEDTLS_SSL_DEBUG_MSG( 2, ( "<= free" ) );
7121
7122 /* Actually clear after last debug message */
7123 mbedtls_zeroize( ssl, sizeof( mbedtls_ssl_context ) );
7124 }
7125
7126 /*
7127 * Initialze mbedtls_ssl_config
7128 */
mbedtls_ssl_config_init(mbedtls_ssl_config * conf)7129 void mbedtls_ssl_config_init( mbedtls_ssl_config *conf )
7130 {
7131 memset( conf, 0, sizeof( mbedtls_ssl_config ) );
7132 }
7133
7134 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7135 static int ssl_preset_default_hashes[] = {
7136 #if defined(MBEDTLS_SHA512_C)
7137 MBEDTLS_MD_SHA512,
7138 MBEDTLS_MD_SHA384,
7139 #endif
7140 #if defined(MBEDTLS_SHA256_C)
7141 MBEDTLS_MD_SHA256,
7142 MBEDTLS_MD_SHA224,
7143 #endif
7144 #if defined(MBEDTLS_SHA1_C)
7145 MBEDTLS_MD_SHA1,
7146 #endif
7147 MBEDTLS_MD_NONE
7148 };
7149 #endif
7150
7151 static int ssl_preset_suiteb_ciphersuites[] = {
7152 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
7153 MBEDTLS_TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
7154 0
7155 };
7156
7157 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7158 static int ssl_preset_suiteb_hashes[] = {
7159 MBEDTLS_MD_SHA256,
7160 MBEDTLS_MD_SHA384,
7161 MBEDTLS_MD_NONE
7162 };
7163 #endif
7164
7165 #if defined(MBEDTLS_ECP_C)
7166 static mbedtls_ecp_group_id ssl_preset_suiteb_curves[] = {
7167 MBEDTLS_ECP_DP_SECP256R1,
7168 MBEDTLS_ECP_DP_SECP384R1,
7169 MBEDTLS_ECP_DP_NONE
7170 };
7171 #endif
7172
7173 /*
7174 * Load default in mbedtls_ssl_config
7175 */
mbedtls_ssl_config_defaults(mbedtls_ssl_config * conf,int endpoint,int transport,int preset)7176 int mbedtls_ssl_config_defaults( mbedtls_ssl_config *conf,
7177 int endpoint, int transport, int preset )
7178 {
7179 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
7180 int ret;
7181 #endif
7182
7183 /* Use the functions here so that they are covered in tests,
7184 * but otherwise access member directly for efficiency */
7185 mbedtls_ssl_conf_endpoint( conf, endpoint );
7186 mbedtls_ssl_conf_transport( conf, transport );
7187
7188 /*
7189 * Things that are common to all presets
7190 */
7191 #if defined(MBEDTLS_SSL_CLI_C)
7192 if( endpoint == MBEDTLS_SSL_IS_CLIENT )
7193 {
7194 conf->authmode = MBEDTLS_SSL_VERIFY_REQUIRED;
7195 #if defined(MBEDTLS_SSL_SESSION_TICKETS)
7196 conf->session_tickets = MBEDTLS_SSL_SESSION_TICKETS_ENABLED;
7197 #endif
7198 }
7199 #endif
7200
7201 #if defined(MBEDTLS_ARC4_C)
7202 conf->arc4_disabled = MBEDTLS_SSL_ARC4_DISABLED;
7203 #endif
7204
7205 #if defined(MBEDTLS_SSL_ENCRYPT_THEN_MAC)
7206 conf->encrypt_then_mac = MBEDTLS_SSL_ETM_ENABLED;
7207 #endif
7208
7209 #if defined(MBEDTLS_SSL_EXTENDED_MASTER_SECRET)
7210 conf->extended_ms = MBEDTLS_SSL_EXTENDED_MS_ENABLED;
7211 #endif
7212
7213 #if defined(MBEDTLS_SSL_CBC_RECORD_SPLITTING)
7214 conf->cbc_record_splitting = MBEDTLS_SSL_CBC_RECORD_SPLITTING_ENABLED;
7215 #endif
7216
7217 #if defined(MBEDTLS_SSL_DTLS_HELLO_VERIFY) && defined(MBEDTLS_SSL_SRV_C)
7218 conf->f_cookie_write = ssl_cookie_write_dummy;
7219 conf->f_cookie_check = ssl_cookie_check_dummy;
7220 #endif
7221
7222 #if defined(MBEDTLS_SSL_DTLS_ANTI_REPLAY)
7223 conf->anti_replay = MBEDTLS_SSL_ANTI_REPLAY_ENABLED;
7224 #endif
7225
7226 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7227 conf->hs_timeout_min = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MIN;
7228 conf->hs_timeout_max = MBEDTLS_SSL_DTLS_TIMEOUT_DFL_MAX;
7229 #endif
7230
7231 #if defined(MBEDTLS_SSL_RENEGOTIATION)
7232 conf->renego_max_records = MBEDTLS_SSL_RENEGO_MAX_RECORDS_DEFAULT;
7233 memset( conf->renego_period, 0xFF, 7 );
7234 conf->renego_period[7] = 0x00;
7235 #endif
7236
7237 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_SRV_C)
7238 if( endpoint == MBEDTLS_SSL_IS_SERVER )
7239 {
7240 if( ( ret = mbedtls_ssl_conf_dh_param( conf,
7241 MBEDTLS_DHM_RFC5114_MODP_2048_P,
7242 MBEDTLS_DHM_RFC5114_MODP_2048_G ) ) != 0 )
7243 {
7244 return( ret );
7245 }
7246 }
7247 #endif
7248
7249 /*
7250 * Preset-specific defaults
7251 */
7252 switch( preset )
7253 {
7254 /*
7255 * NSA Suite B
7256 */
7257 case MBEDTLS_SSL_PRESET_SUITEB:
7258 conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
7259 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_3; /* TLS 1.2 */
7260 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7261 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7262
7263 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7264 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7265 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7266 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7267 ssl_preset_suiteb_ciphersuites;
7268
7269 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7270 conf->cert_profile = &mbedtls_x509_crt_profile_suiteb;
7271 #endif
7272
7273 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7274 conf->sig_hashes = ssl_preset_suiteb_hashes;
7275 #endif
7276
7277 #if defined(MBEDTLS_ECP_C)
7278 conf->curve_list = ssl_preset_suiteb_curves;
7279 #endif
7280 break;
7281
7282 /*
7283 * Default
7284 */
7285 default:
7286 conf->min_major_ver = MBEDTLS_SSL_MAJOR_VERSION_3;
7287 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_1; /* TLS 1.0 */
7288 conf->max_major_ver = MBEDTLS_SSL_MAX_MAJOR_VERSION;
7289 conf->max_minor_ver = MBEDTLS_SSL_MAX_MINOR_VERSION;
7290
7291 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7292 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7293 conf->min_minor_ver = MBEDTLS_SSL_MINOR_VERSION_2;
7294 #endif
7295
7296 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_0] =
7297 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_1] =
7298 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_2] =
7299 conf->ciphersuite_list[MBEDTLS_SSL_MINOR_VERSION_3] =
7300 mbedtls_ssl_list_ciphersuites();
7301
7302 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7303 conf->cert_profile = &mbedtls_x509_crt_profile_default;
7304 #endif
7305
7306 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7307 conf->sig_hashes = ssl_preset_default_hashes;
7308 #endif
7309
7310 #if defined(MBEDTLS_ECP_C)
7311 conf->curve_list = mbedtls_ecp_grp_id_list();
7312 #endif
7313
7314 #if defined(MBEDTLS_DHM_C) && defined(MBEDTLS_SSL_CLI_C)
7315 conf->dhm_min_bitlen = 1024;
7316 #endif
7317 }
7318
7319 return( 0 );
7320 }
7321
7322 /*
7323 * Free mbedtls_ssl_config
7324 */
mbedtls_ssl_config_free(mbedtls_ssl_config * conf)7325 void mbedtls_ssl_config_free( mbedtls_ssl_config *conf )
7326 {
7327 #if defined(MBEDTLS_DHM_C)
7328 mbedtls_mpi_free( &conf->dhm_P );
7329 mbedtls_mpi_free( &conf->dhm_G );
7330 #endif
7331
7332 #if defined(MBEDTLS_KEY_EXCHANGE__SOME__PSK_ENABLED)
7333 if( conf->psk != NULL )
7334 {
7335 mbedtls_zeroize( conf->psk, conf->psk_len );
7336 mbedtls_zeroize( conf->psk_identity, conf->psk_identity_len );
7337 mbedtls_free( conf->psk );
7338 mbedtls_free( conf->psk_identity );
7339 conf->psk_len = 0;
7340 conf->psk_identity_len = 0;
7341 }
7342 #endif
7343
7344 #if defined(MBEDTLS_X509_CRT_PARSE_C)
7345 ssl_key_cert_free( conf->key_cert );
7346 #endif
7347
7348 mbedtls_zeroize( conf, sizeof( mbedtls_ssl_config ) );
7349 }
7350
7351 #if defined(MBEDTLS_PK_C) && \
7352 ( defined(MBEDTLS_RSA_C) || defined(MBEDTLS_ECDSA_C) )
7353 /*
7354 * Convert between MBEDTLS_PK_XXX and SSL_SIG_XXX
7355 */
mbedtls_ssl_sig_from_pk(mbedtls_pk_context * pk)7356 unsigned char mbedtls_ssl_sig_from_pk( mbedtls_pk_context *pk )
7357 {
7358 #if defined(MBEDTLS_RSA_C)
7359 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_RSA ) )
7360 return( MBEDTLS_SSL_SIG_RSA );
7361 #endif
7362 #if defined(MBEDTLS_ECDSA_C)
7363 if( mbedtls_pk_can_do( pk, MBEDTLS_PK_ECDSA ) )
7364 return( MBEDTLS_SSL_SIG_ECDSA );
7365 #endif
7366 return( MBEDTLS_SSL_SIG_ANON );
7367 }
7368
mbedtls_ssl_pk_alg_from_sig(unsigned char sig)7369 mbedtls_pk_type_t mbedtls_ssl_pk_alg_from_sig( unsigned char sig )
7370 {
7371 switch( sig )
7372 {
7373 #if defined(MBEDTLS_RSA_C)
7374 case MBEDTLS_SSL_SIG_RSA:
7375 return( MBEDTLS_PK_RSA );
7376 #endif
7377 #if defined(MBEDTLS_ECDSA_C)
7378 case MBEDTLS_SSL_SIG_ECDSA:
7379 return( MBEDTLS_PK_ECDSA );
7380 #endif
7381 default:
7382 return( MBEDTLS_PK_NONE );
7383 }
7384 }
7385 #endif /* MBEDTLS_PK_C && ( MBEDTLS_RSA_C || MBEDTLS_ECDSA_C ) */
7386
7387 /*
7388 * Convert from MBEDTLS_SSL_HASH_XXX to MBEDTLS_MD_XXX
7389 */
mbedtls_ssl_md_alg_from_hash(unsigned char hash)7390 mbedtls_md_type_t mbedtls_ssl_md_alg_from_hash( unsigned char hash )
7391 {
7392 switch( hash )
7393 {
7394 #if defined(MBEDTLS_MD5_C)
7395 case MBEDTLS_SSL_HASH_MD5:
7396 return( MBEDTLS_MD_MD5 );
7397 #endif
7398 #if defined(MBEDTLS_SHA1_C)
7399 case MBEDTLS_SSL_HASH_SHA1:
7400 return( MBEDTLS_MD_SHA1 );
7401 #endif
7402 #if defined(MBEDTLS_SHA256_C)
7403 case MBEDTLS_SSL_HASH_SHA224:
7404 return( MBEDTLS_MD_SHA224 );
7405 case MBEDTLS_SSL_HASH_SHA256:
7406 return( MBEDTLS_MD_SHA256 );
7407 #endif
7408 #if defined(MBEDTLS_SHA512_C)
7409 case MBEDTLS_SSL_HASH_SHA384:
7410 return( MBEDTLS_MD_SHA384 );
7411 case MBEDTLS_SSL_HASH_SHA512:
7412 return( MBEDTLS_MD_SHA512 );
7413 #endif
7414 default:
7415 return( MBEDTLS_MD_NONE );
7416 }
7417 }
7418
7419 /*
7420 * Convert from MBEDTLS_MD_XXX to MBEDTLS_SSL_HASH_XXX
7421 */
mbedtls_ssl_hash_from_md_alg(int md)7422 unsigned char mbedtls_ssl_hash_from_md_alg( int md )
7423 {
7424 switch( md )
7425 {
7426 #if defined(MBEDTLS_MD5_C)
7427 case MBEDTLS_MD_MD5:
7428 return( MBEDTLS_SSL_HASH_MD5 );
7429 #endif
7430 #if defined(MBEDTLS_SHA1_C)
7431 case MBEDTLS_MD_SHA1:
7432 return( MBEDTLS_SSL_HASH_SHA1 );
7433 #endif
7434 #if defined(MBEDTLS_SHA256_C)
7435 case MBEDTLS_MD_SHA224:
7436 return( MBEDTLS_SSL_HASH_SHA224 );
7437 case MBEDTLS_MD_SHA256:
7438 return( MBEDTLS_SSL_HASH_SHA256 );
7439 #endif
7440 #if defined(MBEDTLS_SHA512_C)
7441 case MBEDTLS_MD_SHA384:
7442 return( MBEDTLS_SSL_HASH_SHA384 );
7443 case MBEDTLS_MD_SHA512:
7444 return( MBEDTLS_SSL_HASH_SHA512 );
7445 #endif
7446 default:
7447 return( MBEDTLS_SSL_HASH_NONE );
7448 }
7449 }
7450
7451 #if defined(MBEDTLS_ECP_C)
7452 /*
7453 * Check if a curve proposed by the peer is in our list.
7454 * Return 0 if we're willing to use it, -1 otherwise.
7455 */
mbedtls_ssl_check_curve(const mbedtls_ssl_context * ssl,mbedtls_ecp_group_id grp_id)7456 int mbedtls_ssl_check_curve( const mbedtls_ssl_context *ssl, mbedtls_ecp_group_id grp_id )
7457 {
7458 const mbedtls_ecp_group_id *gid;
7459
7460 if( ssl->conf->curve_list == NULL )
7461 return( -1 );
7462
7463 for( gid = ssl->conf->curve_list; *gid != MBEDTLS_ECP_DP_NONE; gid++ )
7464 if( *gid == grp_id )
7465 return( 0 );
7466
7467 return( -1 );
7468 }
7469 #endif /* MBEDTLS_ECP_C */
7470
7471 #if defined(MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED)
7472 /*
7473 * Check if a hash proposed by the peer is in our list.
7474 * Return 0 if we're willing to use it, -1 otherwise.
7475 */
mbedtls_ssl_check_sig_hash(const mbedtls_ssl_context * ssl,mbedtls_md_type_t md)7476 int mbedtls_ssl_check_sig_hash( const mbedtls_ssl_context *ssl,
7477 mbedtls_md_type_t md )
7478 {
7479 const int *cur;
7480
7481 if( ssl->conf->sig_hashes == NULL )
7482 return( -1 );
7483
7484 for( cur = ssl->conf->sig_hashes; *cur != MBEDTLS_MD_NONE; cur++ )
7485 if( *cur == (int) md )
7486 return( 0 );
7487
7488 return( -1 );
7489 }
7490 #endif /* MBEDTLS_KEY_EXCHANGE__WITH_CERT__ENABLED */
7491
7492 #if defined(MBEDTLS_X509_CRT_PARSE_C)
mbedtls_ssl_check_cert_usage(const mbedtls_x509_crt * cert,const mbedtls_ssl_ciphersuite_t * ciphersuite,int cert_endpoint,uint32_t * flags)7493 int mbedtls_ssl_check_cert_usage( const mbedtls_x509_crt *cert,
7494 const mbedtls_ssl_ciphersuite_t *ciphersuite,
7495 int cert_endpoint,
7496 uint32_t *flags )
7497 {
7498 int ret = 0;
7499 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
7500 int usage = 0;
7501 #endif
7502 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7503 const char *ext_oid;
7504 size_t ext_len;
7505 #endif
7506
7507 #if !defined(MBEDTLS_X509_CHECK_KEY_USAGE) && \
7508 !defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7509 ((void) cert);
7510 ((void) cert_endpoint);
7511 ((void) flags);
7512 #endif
7513
7514 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
7515 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
7516 {
7517 /* Server part of the key exchange */
7518 switch( ciphersuite->key_exchange )
7519 {
7520 case MBEDTLS_KEY_EXCHANGE_RSA:
7521 case MBEDTLS_KEY_EXCHANGE_RSA_PSK:
7522 usage = MBEDTLS_X509_KU_KEY_ENCIPHERMENT;
7523 break;
7524
7525 case MBEDTLS_KEY_EXCHANGE_DHE_RSA:
7526 case MBEDTLS_KEY_EXCHANGE_ECDHE_RSA:
7527 case MBEDTLS_KEY_EXCHANGE_ECDHE_ECDSA:
7528 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
7529 break;
7530
7531 case MBEDTLS_KEY_EXCHANGE_ECDH_RSA:
7532 case MBEDTLS_KEY_EXCHANGE_ECDH_ECDSA:
7533 usage = MBEDTLS_X509_KU_KEY_AGREEMENT;
7534 break;
7535
7536 /* Don't use default: we want warnings when adding new values */
7537 case MBEDTLS_KEY_EXCHANGE_NONE:
7538 case MBEDTLS_KEY_EXCHANGE_PSK:
7539 case MBEDTLS_KEY_EXCHANGE_DHE_PSK:
7540 case MBEDTLS_KEY_EXCHANGE_ECDHE_PSK:
7541 case MBEDTLS_KEY_EXCHANGE_ECJPAKE:
7542 usage = 0;
7543 }
7544 }
7545 else
7546 {
7547 /* Client auth: we only implement rsa_sign and mbedtls_ecdsa_sign for now */
7548 usage = MBEDTLS_X509_KU_DIGITAL_SIGNATURE;
7549 }
7550
7551 if( mbedtls_x509_crt_check_key_usage( cert, usage ) != 0 )
7552 {
7553 *flags |= MBEDTLS_X509_BADCERT_KEY_USAGE;
7554 ret = -1;
7555 }
7556 #else
7557 ((void) ciphersuite);
7558 #endif /* MBEDTLS_X509_CHECK_KEY_USAGE */
7559
7560 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
7561 if( cert_endpoint == MBEDTLS_SSL_IS_SERVER )
7562 {
7563 ext_oid = MBEDTLS_OID_SERVER_AUTH;
7564 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_SERVER_AUTH );
7565 }
7566 else
7567 {
7568 ext_oid = MBEDTLS_OID_CLIENT_AUTH;
7569 ext_len = MBEDTLS_OID_SIZE( MBEDTLS_OID_CLIENT_AUTH );
7570 }
7571
7572 if( mbedtls_x509_crt_check_extended_key_usage( cert, ext_oid, ext_len ) != 0 )
7573 {
7574 *flags |= MBEDTLS_X509_BADCERT_EXT_KEY_USAGE;
7575 ret = -1;
7576 }
7577 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
7578
7579 return( ret );
7580 }
7581 #endif /* MBEDTLS_X509_CRT_PARSE_C */
7582
7583 /*
7584 * Convert version numbers to/from wire format
7585 * and, for DTLS, to/from TLS equivalent.
7586 *
7587 * For TLS this is the identity.
7588 * For DTLS, use one complement (v -> 255 - v, and then map as follows:
7589 * 1.0 <-> 3.2 (DTLS 1.0 is based on TLS 1.1)
7590 * 1.x <-> 3.x+1 for x != 0 (DTLS 1.2 based on TLS 1.2)
7591 */
mbedtls_ssl_write_version(int major,int minor,int transport,unsigned char ver[2])7592 void mbedtls_ssl_write_version( int major, int minor, int transport,
7593 unsigned char ver[2] )
7594 {
7595 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7596 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7597 {
7598 if( minor == MBEDTLS_SSL_MINOR_VERSION_2 )
7599 --minor; /* DTLS 1.0 stored as TLS 1.1 internally */
7600
7601 ver[0] = (unsigned char)( 255 - ( major - 2 ) );
7602 ver[1] = (unsigned char)( 255 - ( minor - 1 ) );
7603 }
7604 else
7605 #else
7606 ((void) transport);
7607 #endif
7608 {
7609 ver[0] = (unsigned char) major;
7610 ver[1] = (unsigned char) minor;
7611 }
7612 }
7613
mbedtls_ssl_read_version(int * major,int * minor,int transport,const unsigned char ver[2])7614 void mbedtls_ssl_read_version( int *major, int *minor, int transport,
7615 const unsigned char ver[2] )
7616 {
7617 #if defined(MBEDTLS_SSL_PROTO_DTLS)
7618 if( transport == MBEDTLS_SSL_TRANSPORT_DATAGRAM )
7619 {
7620 *major = 255 - ver[0] + 2;
7621 *minor = 255 - ver[1] + 1;
7622
7623 if( *minor == MBEDTLS_SSL_MINOR_VERSION_1 )
7624 ++*minor; /* DTLS 1.0 stored as TLS 1.1 internally */
7625 }
7626 else
7627 #else
7628 ((void) transport);
7629 #endif
7630 {
7631 *major = ver[0];
7632 *minor = ver[1];
7633 }
7634 }
7635
mbedtls_ssl_set_calc_verify_md(mbedtls_ssl_context * ssl,int md)7636 int mbedtls_ssl_set_calc_verify_md( mbedtls_ssl_context *ssl, int md )
7637 {
7638 #if defined(MBEDTLS_SSL_PROTO_TLS1_2)
7639 if( ssl->minor_ver != MBEDTLS_SSL_MINOR_VERSION_3 )
7640 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
7641
7642 switch( md )
7643 {
7644 #if defined(MBEDTLS_SSL_PROTO_TLS1) || defined(MBEDTLS_SSL_PROTO_TLS1_1)
7645 #if defined(MBEDTLS_MD5_C)
7646 case MBEDTLS_SSL_HASH_MD5:
7647 ssl->handshake->calc_verify = ssl_calc_verify_tls;
7648 break;
7649 #endif
7650 #if defined(MBEDTLS_SHA1_C)
7651 case MBEDTLS_SSL_HASH_SHA1:
7652 ssl->handshake->calc_verify = ssl_calc_verify_tls;
7653 break;
7654 #endif
7655 #endif /* MBEDTLS_SSL_PROTO_TLS1 || MBEDTLS_SSL_PROTO_TLS1_1 */
7656 #if defined(MBEDTLS_SHA512_C)
7657 case MBEDTLS_SSL_HASH_SHA384:
7658 ssl->handshake->calc_verify = ssl_calc_verify_tls_sha384;
7659 break;
7660 #endif
7661 #if defined(MBEDTLS_SHA256_C)
7662 case MBEDTLS_SSL_HASH_SHA256:
7663 ssl->handshake->calc_verify = ssl_calc_verify_tls_sha256;
7664 break;
7665 #endif
7666 default:
7667 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
7668 }
7669
7670 return 0;
7671 #else /* !MBEDTLS_SSL_PROTO_TLS1_2 */
7672 (void) ssl;
7673 (void) md;
7674
7675 return MBEDTLS_ERR_SSL_INVALID_VERIFY_HASH;
7676 #endif /* MBEDTLS_SSL_PROTO_TLS1_2 */
7677 }
7678
7679 #endif /* MBEDTLS_SSL_TLS_C */
7680
