1 /*
2 * X.509 certificate parsing and verification
3 *
4 * Copyright The Mbed TLS Contributors
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 /*
20 * The ITU-T X.509 standard defines a certificate format for PKI.
21 *
22 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
23 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
24 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
25 *
26 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
27 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
28 *
29 * [SIRO] https://cabforum.org/wp-content/uploads/Chunghwatelecom201503cabforumV4.pdf
30 */
31
32 #include "common.h"
33
34 #if defined(MBEDTLS_X509_CRT_PARSE_C)
35
36 #include "mbedtls/x509_crt.h"
37 #include "mbedtls/error.h"
38 #include "mbedtls/oid.h"
39 #include "mbedtls/platform_util.h"
40
41 #include <string.h>
42
43 #if defined(MBEDTLS_PEM_PARSE_C)
44 #include "mbedtls/pem.h"
45 #endif
46
47 #if defined(MBEDTLS_USE_PSA_CRYPTO)
48 #include "psa/crypto.h"
49 #include "mbedtls/psa_util.h"
50 #endif /* MBEDTLS_USE_PSA_CRYPTO */
51 #include "hash_info.h"
52
53 #include "mbedtls/platform.h"
54
55 #if defined(MBEDTLS_THREADING_C)
56 #include "mbedtls/threading.h"
57 #endif
58
59 #if defined(MBEDTLS_HAVE_TIME)
60 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
61 #include <windows.h>
62 #else
63 #include <time.h>
64 #endif
65 #endif
66
67 #if defined(MBEDTLS_FS_IO)
68 #include <stdio.h>
69 #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32)
70 #include <sys/types.h>
71 #include <sys/stat.h>
72 #if defined(__MBED__)
73 #include <platform/mbed_retarget.h>
74 #else
75 #include <dirent.h>
76 #endif /* __MBED__ */
77 #include <errno.h>
78 #endif /* !_WIN32 || EFIX64 || EFI32 */
79 #endif
80
81 /*
82 * Item in a verification chain: cert and flags for it
83 */
84 typedef struct {
85 mbedtls_x509_crt *crt;
86 uint32_t flags;
87 } x509_crt_verify_chain_item;
88
89 /*
90 * Max size of verification chain: end-entity + intermediates + trusted root
91 */
92 #define X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 )
93
94 /* Default profile. Do not remove items unless there are serious security
95 * concerns. */
96 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default =
97 {
98 /* Hashes from SHA-256 and above. Note that this selection
99 * should be aligned with ssl_preset_default_hashes in ssl_tls.c. */
100 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
101 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
102 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
103 0xFFFFFFF, /* Any PK alg */
104 #if defined(MBEDTLS_ECP_C)
105 /* Curves at or above 128-bit security level. Note that this selection
106 * should be aligned with ssl_preset_default_curves in ssl_tls.c. */
107 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
108 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
109 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |
110 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
111 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
112 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
113 0,
114 #else
115 0,
116 #endif
117 2048,
118 };
119
120 /* Next-generation profile. Currently identical to the default, but may
121 * be tightened at any time. */
122 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next =
123 {
124 /* Hashes from SHA-256 and above. */
125 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
126 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
127 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
128 0xFFFFFFF, /* Any PK alg */
129 #if defined(MBEDTLS_ECP_C)
130 /* Curves at or above 128-bit security level. */
131 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
132 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
133 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |
134 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
135 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
136 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
137 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ),
138 #else
139 0,
140 #endif
141 2048,
142 };
143
144 /*
145 * NSA Suite B Profile
146 */
147 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb =
148 {
149 /* Only SHA-256 and 384 */
150 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
151 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ),
152 /* Only ECDSA */
153 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ) |
154 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECKEY ),
155 #if defined(MBEDTLS_ECP_C)
156 /* Only NIST P-256 and P-384 */
157 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
158 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ),
159 #else
160 0,
161 #endif
162 0,
163 };
164
165 /*
166 * Empty / all-forbidden profile
167 */
168 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_none =
169 {
170 0,
171 0,
172 0,
173 (uint32_t) -1,
174 };
175
176 /*
177 * Check md_alg against profile
178 * Return 0 if md_alg is acceptable for this profile, -1 otherwise
179 */
x509_profile_check_md_alg(const mbedtls_x509_crt_profile * profile,mbedtls_md_type_t md_alg)180 static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile,
181 mbedtls_md_type_t md_alg )
182 {
183 if( md_alg == MBEDTLS_MD_NONE )
184 return( -1 );
185
186 if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 )
187 return( 0 );
188
189 return( -1 );
190 }
191
192 /*
193 * Check pk_alg against profile
194 * Return 0 if pk_alg is acceptable for this profile, -1 otherwise
195 */
x509_profile_check_pk_alg(const mbedtls_x509_crt_profile * profile,mbedtls_pk_type_t pk_alg)196 static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile,
197 mbedtls_pk_type_t pk_alg )
198 {
199 if( pk_alg == MBEDTLS_PK_NONE )
200 return( -1 );
201
202 if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 )
203 return( 0 );
204
205 return( -1 );
206 }
207
208 /*
209 * Check key against profile
210 * Return 0 if pk is acceptable for this profile, -1 otherwise
211 */
x509_profile_check_key(const mbedtls_x509_crt_profile * profile,const mbedtls_pk_context * pk)212 static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile,
213 const mbedtls_pk_context *pk )
214 {
215 const mbedtls_pk_type_t pk_alg = mbedtls_pk_get_type( pk );
216
217 #if defined(MBEDTLS_RSA_C)
218 if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS )
219 {
220 if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen )
221 return( 0 );
222
223 return( -1 );
224 }
225 #endif
226
227 #if defined(MBEDTLS_ECP_C)
228 if( pk_alg == MBEDTLS_PK_ECDSA ||
229 pk_alg == MBEDTLS_PK_ECKEY ||
230 pk_alg == MBEDTLS_PK_ECKEY_DH )
231 {
232 const mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id;
233
234 if( gid == MBEDTLS_ECP_DP_NONE )
235 return( -1 );
236
237 if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 )
238 return( 0 );
239
240 return( -1 );
241 }
242 #endif
243
244 return( -1 );
245 }
246
247 /*
248 * Like memcmp, but case-insensitive and always returns -1 if different
249 */
x509_memcasecmp(const void * s1,const void * s2,size_t len)250 static int x509_memcasecmp( const void *s1, const void *s2, size_t len )
251 {
252 size_t i;
253 unsigned char diff;
254 const unsigned char *n1 = s1, *n2 = s2;
255
256 for( i = 0; i < len; i++ )
257 {
258 diff = n1[i] ^ n2[i];
259
260 if( diff == 0 )
261 continue;
262
263 if( diff == 32 &&
264 ( ( n1[i] >= 'a' && n1[i] <= 'z' ) ||
265 ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) )
266 {
267 continue;
268 }
269
270 return( -1 );
271 }
272
273 return( 0 );
274 }
275
276 /*
277 * Return 0 if name matches wildcard, -1 otherwise
278 */
x509_check_wildcard(const char * cn,const mbedtls_x509_buf * name)279 static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name )
280 {
281 size_t i;
282 size_t cn_idx = 0, cn_len = strlen( cn );
283
284 /* We can't have a match if there is no wildcard to match */
285 if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' )
286 return( -1 );
287
288 for( i = 0; i < cn_len; ++i )
289 {
290 if( cn[i] == '.' )
291 {
292 cn_idx = i;
293 break;
294 }
295 }
296
297 if( cn_idx == 0 )
298 return( -1 );
299
300 if( cn_len - cn_idx == name->len - 1 &&
301 x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
302 {
303 return( 0 );
304 }
305
306 return( -1 );
307 }
308
309 /*
310 * Compare two X.509 strings, case-insensitive, and allowing for some encoding
311 * variations (but not all).
312 *
313 * Return 0 if equal, -1 otherwise.
314 */
x509_string_cmp(const mbedtls_x509_buf * a,const mbedtls_x509_buf * b)315 static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b )
316 {
317 if( a->tag == b->tag &&
318 a->len == b->len &&
319 memcmp( a->p, b->p, b->len ) == 0 )
320 {
321 return( 0 );
322 }
323
324 if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
325 ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
326 a->len == b->len &&
327 x509_memcasecmp( a->p, b->p, b->len ) == 0 )
328 {
329 return( 0 );
330 }
331
332 return( -1 );
333 }
334
335 /*
336 * Compare two X.509 Names (aka rdnSequence).
337 *
338 * See RFC 5280 section 7.1, though we don't implement the whole algorithm:
339 * we sometimes return unequal when the full algorithm would return equal,
340 * but never the other way. (In particular, we don't do Unicode normalisation
341 * or space folding.)
342 *
343 * Return 0 if equal, -1 otherwise.
344 */
x509_name_cmp(const mbedtls_x509_name * a,const mbedtls_x509_name * b)345 static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b )
346 {
347 /* Avoid recursion, it might not be optimised by the compiler */
348 while( a != NULL || b != NULL )
349 {
350 if( a == NULL || b == NULL )
351 return( -1 );
352
353 /* type */
354 if( a->oid.tag != b->oid.tag ||
355 a->oid.len != b->oid.len ||
356 memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 )
357 {
358 return( -1 );
359 }
360
361 /* value */
362 if( x509_string_cmp( &a->val, &b->val ) != 0 )
363 return( -1 );
364
365 /* structure of the list of sets */
366 if( a->next_merged != b->next_merged )
367 return( -1 );
368
369 a = a->next;
370 b = b->next;
371 }
372
373 /* a == NULL == b */
374 return( 0 );
375 }
376
377 /*
378 * Reset (init or clear) a verify_chain
379 */
x509_crt_verify_chain_reset(mbedtls_x509_crt_verify_chain * ver_chain)380 static void x509_crt_verify_chain_reset(
381 mbedtls_x509_crt_verify_chain *ver_chain )
382 {
383 size_t i;
384
385 for( i = 0; i < MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE; i++ )
386 {
387 ver_chain->items[i].crt = NULL;
388 ver_chain->items[i].flags = (uint32_t) -1;
389 }
390
391 ver_chain->len = 0;
392
393 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
394 ver_chain->trust_ca_cb_result = NULL;
395 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
396 }
397
398 /*
399 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
400 */
x509_get_version(unsigned char ** p,const unsigned char * end,int * ver)401 static int x509_get_version( unsigned char **p,
402 const unsigned char *end,
403 int *ver )
404 {
405 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
406 size_t len;
407
408 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
409 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 )
410 {
411 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
412 {
413 *ver = 0;
414 return( 0 );
415 }
416
417 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
418 }
419
420 end = *p + len;
421
422 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
423 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION, ret ) );
424
425 if( *p != end )
426 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION,
427 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
428
429 return( 0 );
430 }
431
432 /*
433 * Validity ::= SEQUENCE {
434 * notBefore Time,
435 * notAfter Time }
436 */
x509_get_dates(unsigned char ** p,const unsigned char * end,mbedtls_x509_time * from,mbedtls_x509_time * to)437 static int x509_get_dates( unsigned char **p,
438 const unsigned char *end,
439 mbedtls_x509_time *from,
440 mbedtls_x509_time *to )
441 {
442 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
443 size_t len;
444
445 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
446 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
447 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE, ret ) );
448
449 end = *p + len;
450
451 if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 )
452 return( ret );
453
454 if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 )
455 return( ret );
456
457 if( *p != end )
458 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE,
459 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
460
461 return( 0 );
462 }
463
464 /*
465 * X.509 v2/v3 unique identifier (not parsed)
466 */
x509_get_uid(unsigned char ** p,const unsigned char * end,mbedtls_x509_buf * uid,int n)467 static int x509_get_uid( unsigned char **p,
468 const unsigned char *end,
469 mbedtls_x509_buf *uid, int n )
470 {
471 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
472
473 if( *p == end )
474 return( 0 );
475
476 uid->tag = **p;
477
478 if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len,
479 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 )
480 {
481 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
482 return( 0 );
483
484 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
485 }
486
487 uid->p = *p;
488 *p += uid->len;
489
490 return( 0 );
491 }
492
x509_get_basic_constraints(unsigned char ** p,const unsigned char * end,int * ca_istrue,int * max_pathlen)493 static int x509_get_basic_constraints( unsigned char **p,
494 const unsigned char *end,
495 int *ca_istrue,
496 int *max_pathlen )
497 {
498 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
499 size_t len;
500
501 /*
502 * BasicConstraints ::= SEQUENCE {
503 * cA BOOLEAN DEFAULT FALSE,
504 * pathLenConstraint INTEGER (0..MAX) OPTIONAL }
505 */
506 *ca_istrue = 0; /* DEFAULT FALSE */
507 *max_pathlen = 0; /* endless */
508
509 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
510 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
511 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
512
513 if( *p == end )
514 return( 0 );
515
516 if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 )
517 {
518 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
519 ret = mbedtls_asn1_get_int( p, end, ca_istrue );
520
521 if( ret != 0 )
522 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
523
524 if( *ca_istrue != 0 )
525 *ca_istrue = 1;
526 }
527
528 if( *p == end )
529 return( 0 );
530
531 if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 )
532 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
533
534 if( *p != end )
535 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
536 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
537
538 /* Do not accept max_pathlen equal to INT_MAX to avoid a signed integer
539 * overflow, which is an undefined behavior. */
540 if( *max_pathlen == INT_MAX )
541 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
542 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
543
544 (*max_pathlen)++;
545
546 return( 0 );
547 }
548
x509_get_ns_cert_type(unsigned char ** p,const unsigned char * end,unsigned char * ns_cert_type)549 static int x509_get_ns_cert_type( unsigned char **p,
550 const unsigned char *end,
551 unsigned char *ns_cert_type)
552 {
553 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
554 mbedtls_x509_bitstring bs = { 0, 0, NULL };
555
556 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
557 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
558
559 if( bs.len != 1 )
560 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
561 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
562
563 /* Get actual bitstring */
564 *ns_cert_type = *bs.p;
565 return( 0 );
566 }
567
x509_get_key_usage(unsigned char ** p,const unsigned char * end,unsigned int * key_usage)568 static int x509_get_key_usage( unsigned char **p,
569 const unsigned char *end,
570 unsigned int *key_usage)
571 {
572 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
573 size_t i;
574 mbedtls_x509_bitstring bs = { 0, 0, NULL };
575
576 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
577 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
578
579 if( bs.len < 1 )
580 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
581 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
582
583 /* Get actual bitstring */
584 *key_usage = 0;
585 for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ )
586 {
587 *key_usage |= (unsigned int) bs.p[i] << (8*i);
588 }
589
590 return( 0 );
591 }
592
593 /*
594 * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
595 *
596 * KeyPurposeId ::= OBJECT IDENTIFIER
597 */
x509_get_ext_key_usage(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * ext_key_usage)598 static int x509_get_ext_key_usage( unsigned char **p,
599 const unsigned char *end,
600 mbedtls_x509_sequence *ext_key_usage)
601 {
602 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
603
604 if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 )
605 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
606
607 /* Sequence length must be >= 1 */
608 if( ext_key_usage->buf.p == NULL )
609 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
610 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
611
612 return( 0 );
613 }
614
615 /*
616 * SubjectAltName ::= GeneralNames
617 *
618 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
619 *
620 * GeneralName ::= CHOICE {
621 * otherName [0] OtherName,
622 * rfc822Name [1] IA5String,
623 * dNSName [2] IA5String,
624 * x400Address [3] ORAddress,
625 * directoryName [4] Name,
626 * ediPartyName [5] EDIPartyName,
627 * uniformResourceIdentifier [6] IA5String,
628 * iPAddress [7] OCTET STRING,
629 * registeredID [8] OBJECT IDENTIFIER }
630 *
631 * OtherName ::= SEQUENCE {
632 * type-id OBJECT IDENTIFIER,
633 * value [0] EXPLICIT ANY DEFINED BY type-id }
634 *
635 * EDIPartyName ::= SEQUENCE {
636 * nameAssigner [0] DirectoryString OPTIONAL,
637 * partyName [1] DirectoryString }
638 *
639 * NOTE: we list all types, but only use dNSName and otherName
640 * of type HwModuleName, as defined in RFC 4108, at this point.
641 */
x509_get_subject_alt_name(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * subject_alt_name)642 static int x509_get_subject_alt_name( unsigned char **p,
643 const unsigned char *end,
644 mbedtls_x509_sequence *subject_alt_name )
645 {
646 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
647 size_t len, tag_len;
648 mbedtls_asn1_buf *buf;
649 unsigned char tag;
650 mbedtls_asn1_sequence *cur = subject_alt_name;
651
652 /* Get main sequence tag */
653 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
654 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
655 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
656
657 if( *p + len != end )
658 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
659 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
660
661 while( *p < end )
662 {
663 mbedtls_x509_subject_alternative_name dummy_san_buf;
664 memset( &dummy_san_buf, 0, sizeof( dummy_san_buf ) );
665
666 tag = **p;
667 (*p)++;
668 if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 )
669 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
670
671 if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) !=
672 MBEDTLS_ASN1_CONTEXT_SPECIFIC )
673 {
674 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
675 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) );
676 }
677
678 /*
679 * Check that the SAN is structured correctly.
680 */
681 ret = mbedtls_x509_parse_subject_alt_name( &(cur->buf), &dummy_san_buf );
682 /*
683 * In case the extension is malformed, return an error,
684 * and clear the allocated sequences.
685 */
686 if( ret != 0 && ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
687 {
688 mbedtls_asn1_sequence_free( subject_alt_name->next );
689 subject_alt_name->next = NULL;
690 return( ret );
691 }
692
693 /* Allocate and assign next pointer */
694 if( cur->buf.p != NULL )
695 {
696 if( cur->next != NULL )
697 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
698
699 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
700
701 if( cur->next == NULL )
702 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
703 MBEDTLS_ERR_ASN1_ALLOC_FAILED ) );
704
705 cur = cur->next;
706 }
707
708 buf = &(cur->buf);
709 buf->tag = tag;
710 buf->p = *p;
711 buf->len = tag_len;
712 *p += buf->len;
713 }
714
715 /* Set final sequence entry's next pointer to NULL */
716 cur->next = NULL;
717
718 if( *p != end )
719 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
720 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
721
722 return( 0 );
723 }
724
725 /*
726 * id-ce-certificatePolicies OBJECT IDENTIFIER ::= { id-ce 32 }
727 *
728 * anyPolicy OBJECT IDENTIFIER ::= { id-ce-certificatePolicies 0 }
729 *
730 * certificatePolicies ::= SEQUENCE SIZE (1..MAX) OF PolicyInformation
731 *
732 * PolicyInformation ::= SEQUENCE {
733 * policyIdentifier CertPolicyId,
734 * policyQualifiers SEQUENCE SIZE (1..MAX) OF
735 * PolicyQualifierInfo OPTIONAL }
736 *
737 * CertPolicyId ::= OBJECT IDENTIFIER
738 *
739 * PolicyQualifierInfo ::= SEQUENCE {
740 * policyQualifierId PolicyQualifierId,
741 * qualifier ANY DEFINED BY policyQualifierId }
742 *
743 * -- policyQualifierIds for Internet policy qualifiers
744 *
745 * id-qt OBJECT IDENTIFIER ::= { id-pkix 2 }
746 * id-qt-cps OBJECT IDENTIFIER ::= { id-qt 1 }
747 * id-qt-unotice OBJECT IDENTIFIER ::= { id-qt 2 }
748 *
749 * PolicyQualifierId ::= OBJECT IDENTIFIER ( id-qt-cps | id-qt-unotice )
750 *
751 * Qualifier ::= CHOICE {
752 * cPSuri CPSuri,
753 * userNotice UserNotice }
754 *
755 * CPSuri ::= IA5String
756 *
757 * UserNotice ::= SEQUENCE {
758 * noticeRef NoticeReference OPTIONAL,
759 * explicitText DisplayText OPTIONAL }
760 *
761 * NoticeReference ::= SEQUENCE {
762 * organization DisplayText,
763 * noticeNumbers SEQUENCE OF INTEGER }
764 *
765 * DisplayText ::= CHOICE {
766 * ia5String IA5String (SIZE (1..200)),
767 * visibleString VisibleString (SIZE (1..200)),
768 * bmpString BMPString (SIZE (1..200)),
769 * utf8String UTF8String (SIZE (1..200)) }
770 *
771 * NOTE: we only parse and use anyPolicy without qualifiers at this point
772 * as defined in RFC 5280.
773 */
x509_get_certificate_policies(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * certificate_policies)774 static int x509_get_certificate_policies( unsigned char **p,
775 const unsigned char *end,
776 mbedtls_x509_sequence *certificate_policies )
777 {
778 int ret, parse_ret = 0;
779 size_t len;
780 mbedtls_asn1_buf *buf;
781 mbedtls_asn1_sequence *cur = certificate_policies;
782
783 /* Get main sequence tag */
784 ret = mbedtls_asn1_get_tag( p, end, &len,
785 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE );
786 if( ret != 0 )
787 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
788
789 if( *p + len != end )
790 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
791 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
792
793 /*
794 * Cannot be an empty sequence.
795 */
796 if( len == 0 )
797 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
798 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
799
800 while( *p < end )
801 {
802 mbedtls_x509_buf policy_oid;
803 const unsigned char *policy_end;
804
805 /*
806 * Get the policy sequence
807 */
808 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
809 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
810 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
811
812 policy_end = *p + len;
813
814 if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
815 MBEDTLS_ASN1_OID ) ) != 0 )
816 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
817
818 policy_oid.tag = MBEDTLS_ASN1_OID;
819 policy_oid.len = len;
820 policy_oid.p = *p;
821
822 /*
823 * Only AnyPolicy is currently supported when enforcing policy.
824 */
825 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_POLICY, &policy_oid ) != 0 )
826 {
827 /*
828 * Set the parsing return code but continue parsing, in case this
829 * extension is critical.
830 */
831 parse_ret = MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
832 }
833
834 /* Allocate and assign next pointer */
835 if( cur->buf.p != NULL )
836 {
837 if( cur->next != NULL )
838 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
839
840 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
841
842 if( cur->next == NULL )
843 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
844 MBEDTLS_ERR_ASN1_ALLOC_FAILED ) );
845
846 cur = cur->next;
847 }
848
849 buf = &( cur->buf );
850 buf->tag = policy_oid.tag;
851 buf->p = policy_oid.p;
852 buf->len = policy_oid.len;
853
854 *p += len;
855
856 /*
857 * If there is an optional qualifier, then *p < policy_end
858 * Check the Qualifier len to verify it doesn't exceed policy_end.
859 */
860 if( *p < policy_end )
861 {
862 if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
863 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
864 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
865 /*
866 * Skip the optional policy qualifiers.
867 */
868 *p += len;
869 }
870
871 if( *p != policy_end )
872 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
873 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
874 }
875
876 /* Set final sequence entry's next pointer to NULL */
877 cur->next = NULL;
878
879 if( *p != end )
880 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
881 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
882
883 return( parse_ret );
884 }
885
886 /*
887 * X.509 v3 extensions
888 *
889 */
x509_get_crt_ext(unsigned char ** p,const unsigned char * end,mbedtls_x509_crt * crt,mbedtls_x509_crt_ext_cb_t cb,void * p_ctx)890 static int x509_get_crt_ext( unsigned char **p,
891 const unsigned char *end,
892 mbedtls_x509_crt *crt,
893 mbedtls_x509_crt_ext_cb_t cb,
894 void *p_ctx )
895 {
896 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
897 size_t len;
898 unsigned char *end_ext_data, *start_ext_octet, *end_ext_octet;
899
900 if( *p == end )
901 return( 0 );
902
903 if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 )
904 return( ret );
905
906 end = crt->v3_ext.p + crt->v3_ext.len;
907 while( *p < end )
908 {
909 /*
910 * Extension ::= SEQUENCE {
911 * extnID OBJECT IDENTIFIER,
912 * critical BOOLEAN DEFAULT FALSE,
913 * extnValue OCTET STRING }
914 */
915 mbedtls_x509_buf extn_oid = {0, 0, NULL};
916 int is_critical = 0; /* DEFAULT FALSE */
917 int ext_type = 0;
918
919 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
920 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
921 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
922
923 end_ext_data = *p + len;
924
925 /* Get extension ID */
926 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len,
927 MBEDTLS_ASN1_OID ) ) != 0 )
928 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
929
930 extn_oid.tag = MBEDTLS_ASN1_OID;
931 extn_oid.p = *p;
932 *p += extn_oid.len;
933
934 /* Get optional critical */
935 if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
936 ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )
937 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
938
939 /* Data should be octet string type */
940 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len,
941 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
942 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
943
944 start_ext_octet = *p;
945 end_ext_octet = *p + len;
946
947 if( end_ext_octet != end_ext_data )
948 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
949 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
950
951 /*
952 * Detect supported extensions
953 */
954 ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type );
955
956 if( ret != 0 )
957 {
958 /* Give the callback (if any) a chance to handle the extension */
959 if( cb != NULL )
960 {
961 ret = cb( p_ctx, crt, &extn_oid, is_critical, *p, end_ext_octet );
962 if( ret != 0 && is_critical )
963 return( ret );
964 *p = end_ext_octet;
965 continue;
966 }
967
968 /* No parser found, skip extension */
969 *p = end_ext_octet;
970
971 if( is_critical )
972 {
973 /* Data is marked as critical: fail */
974 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
975 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) );
976 }
977 continue;
978 }
979
980 /* Forbid repeated extensions */
981 if( ( crt->ext_types & ext_type ) != 0 )
982 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
983
984 crt->ext_types |= ext_type;
985
986 switch( ext_type )
987 {
988 case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS:
989 /* Parse basic constraints */
990 if( ( ret = x509_get_basic_constraints( p, end_ext_octet,
991 &crt->ca_istrue, &crt->max_pathlen ) ) != 0 )
992 return( ret );
993 break;
994
995 case MBEDTLS_X509_EXT_KEY_USAGE:
996 /* Parse key usage */
997 if( ( ret = x509_get_key_usage( p, end_ext_octet,
998 &crt->key_usage ) ) != 0 )
999 return( ret );
1000 break;
1001
1002 case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE:
1003 /* Parse extended key usage */
1004 if( ( ret = x509_get_ext_key_usage( p, end_ext_octet,
1005 &crt->ext_key_usage ) ) != 0 )
1006 return( ret );
1007 break;
1008
1009 case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
1010 /* Parse subject alt name */
1011 if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
1012 &crt->subject_alt_names ) ) != 0 )
1013 return( ret );
1014 break;
1015
1016 case MBEDTLS_X509_EXT_NS_CERT_TYPE:
1017 /* Parse netscape certificate type */
1018 if( ( ret = x509_get_ns_cert_type( p, end_ext_octet,
1019 &crt->ns_cert_type ) ) != 0 )
1020 return( ret );
1021 break;
1022
1023 case MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES:
1024 /* Parse certificate policies type */
1025 if( ( ret = x509_get_certificate_policies( p, end_ext_octet,
1026 &crt->certificate_policies ) ) != 0 )
1027 {
1028 /* Give the callback (if any) a chance to handle the extension
1029 * if it contains unsupported policies */
1030 if( ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE && cb != NULL &&
1031 cb( p_ctx, crt, &extn_oid, is_critical,
1032 start_ext_octet, end_ext_octet ) == 0 )
1033 break;
1034
1035 if( is_critical )
1036 return( ret );
1037 else
1038 /*
1039 * If MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE is returned, then we
1040 * cannot interpret or enforce the policy. However, it is up to
1041 * the user to choose how to enforce the policies,
1042 * unless the extension is critical.
1043 */
1044 if( ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
1045 return( ret );
1046 }
1047 break;
1048
1049 default:
1050 /*
1051 * If this is a non-critical extension, which the oid layer
1052 * supports, but there isn't an x509 parser for it,
1053 * skip the extension.
1054 */
1055 if( is_critical )
1056 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1057 else
1058 *p = end_ext_octet;
1059 }
1060 }
1061
1062 if( *p != end )
1063 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1064 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1065
1066 return( 0 );
1067 }
1068
1069 /*
1070 * Parse and fill a single X.509 certificate in DER format
1071 */
x509_crt_parse_der_core(mbedtls_x509_crt * crt,const unsigned char * buf,size_t buflen,int make_copy,mbedtls_x509_crt_ext_cb_t cb,void * p_ctx)1072 static int x509_crt_parse_der_core( mbedtls_x509_crt *crt,
1073 const unsigned char *buf,
1074 size_t buflen,
1075 int make_copy,
1076 mbedtls_x509_crt_ext_cb_t cb,
1077 void *p_ctx )
1078 {
1079 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1080 size_t len;
1081 unsigned char *p, *end, *crt_end;
1082 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
1083
1084 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) );
1085 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) );
1086 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) );
1087
1088 /*
1089 * Check for valid input
1090 */
1091 if( crt == NULL || buf == NULL )
1092 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1093
1094 /* Use the original buffer until we figure out actual length. */
1095 p = (unsigned char*) buf;
1096 len = buflen;
1097 end = p + len;
1098
1099 /*
1100 * Certificate ::= SEQUENCE {
1101 * tbsCertificate TBSCertificate,
1102 * signatureAlgorithm AlgorithmIdentifier,
1103 * signatureValue BIT STRING }
1104 */
1105 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1106 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1107 {
1108 mbedtls_x509_crt_free( crt );
1109 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
1110 }
1111
1112 end = crt_end = p + len;
1113 crt->raw.len = crt_end - buf;
1114 if( make_copy != 0 )
1115 {
1116 /* Create and populate a new buffer for the raw field. */
1117 crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len );
1118 if( crt->raw.p == NULL )
1119 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
1120
1121 memcpy( crt->raw.p, buf, crt->raw.len );
1122 crt->own_buffer = 1;
1123
1124 p += crt->raw.len - len;
1125 end = crt_end = p + len;
1126 }
1127 else
1128 {
1129 crt->raw.p = (unsigned char*) buf;
1130 crt->own_buffer = 0;
1131 }
1132
1133 /*
1134 * TBSCertificate ::= SEQUENCE {
1135 */
1136 crt->tbs.p = p;
1137
1138 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1139 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1140 {
1141 mbedtls_x509_crt_free( crt );
1142 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1143 }
1144
1145 end = p + len;
1146 crt->tbs.len = end - crt->tbs.p;
1147
1148 /*
1149 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
1150 *
1151 * CertificateSerialNumber ::= INTEGER
1152 *
1153 * signature AlgorithmIdentifier
1154 */
1155 if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 ||
1156 ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 ||
1157 ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid,
1158 &sig_params1 ) ) != 0 )
1159 {
1160 mbedtls_x509_crt_free( crt );
1161 return( ret );
1162 }
1163
1164 if( crt->version < 0 || crt->version > 2 )
1165 {
1166 mbedtls_x509_crt_free( crt );
1167 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
1168 }
1169
1170 crt->version++;
1171
1172 if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1,
1173 &crt->sig_md, &crt->sig_pk,
1174 &crt->sig_opts ) ) != 0 )
1175 {
1176 mbedtls_x509_crt_free( crt );
1177 return( ret );
1178 }
1179
1180 /*
1181 * issuer Name
1182 */
1183 crt->issuer_raw.p = p;
1184
1185 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1186 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1187 {
1188 mbedtls_x509_crt_free( crt );
1189 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1190 }
1191
1192 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 )
1193 {
1194 mbedtls_x509_crt_free( crt );
1195 return( ret );
1196 }
1197
1198 crt->issuer_raw.len = p - crt->issuer_raw.p;
1199
1200 /*
1201 * Validity ::= SEQUENCE {
1202 * notBefore Time,
1203 * notAfter Time }
1204 *
1205 */
1206 if( ( ret = x509_get_dates( &p, end, &crt->valid_from,
1207 &crt->valid_to ) ) != 0 )
1208 {
1209 mbedtls_x509_crt_free( crt );
1210 return( ret );
1211 }
1212
1213 /*
1214 * subject Name
1215 */
1216 crt->subject_raw.p = p;
1217
1218 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1219 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1220 {
1221 mbedtls_x509_crt_free( crt );
1222 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1223 }
1224
1225 if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 )
1226 {
1227 mbedtls_x509_crt_free( crt );
1228 return( ret );
1229 }
1230
1231 crt->subject_raw.len = p - crt->subject_raw.p;
1232
1233 /*
1234 * SubjectPublicKeyInfo
1235 */
1236 crt->pk_raw.p = p;
1237 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 )
1238 {
1239 mbedtls_x509_crt_free( crt );
1240 return( ret );
1241 }
1242 crt->pk_raw.len = p - crt->pk_raw.p;
1243
1244 /*
1245 * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
1246 * -- If present, version shall be v2 or v3
1247 * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
1248 * -- If present, version shall be v2 or v3
1249 * extensions [3] EXPLICIT Extensions OPTIONAL
1250 * -- If present, version shall be v3
1251 */
1252 if( crt->version == 2 || crt->version == 3 )
1253 {
1254 ret = x509_get_uid( &p, end, &crt->issuer_id, 1 );
1255 if( ret != 0 )
1256 {
1257 mbedtls_x509_crt_free( crt );
1258 return( ret );
1259 }
1260 }
1261
1262 if( crt->version == 2 || crt->version == 3 )
1263 {
1264 ret = x509_get_uid( &p, end, &crt->subject_id, 2 );
1265 if( ret != 0 )
1266 {
1267 mbedtls_x509_crt_free( crt );
1268 return( ret );
1269 }
1270 }
1271
1272 if( crt->version == 3 )
1273 {
1274 ret = x509_get_crt_ext( &p, end, crt, cb, p_ctx );
1275 if( ret != 0 )
1276 {
1277 mbedtls_x509_crt_free( crt );
1278 return( ret );
1279 }
1280 }
1281
1282 if( p != end )
1283 {
1284 mbedtls_x509_crt_free( crt );
1285 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT,
1286 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1287 }
1288
1289 end = crt_end;
1290
1291 /*
1292 * }
1293 * -- end of TBSCertificate
1294 *
1295 * signatureAlgorithm AlgorithmIdentifier,
1296 * signatureValue BIT STRING
1297 */
1298 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 )
1299 {
1300 mbedtls_x509_crt_free( crt );
1301 return( ret );
1302 }
1303
1304 if( crt->sig_oid.len != sig_oid2.len ||
1305 memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 ||
1306 sig_params1.tag != sig_params2.tag ||
1307 sig_params1.len != sig_params2.len ||
1308 ( sig_params1.len != 0 &&
1309 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) )
1310 {
1311 mbedtls_x509_crt_free( crt );
1312 return( MBEDTLS_ERR_X509_SIG_MISMATCH );
1313 }
1314
1315 if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 )
1316 {
1317 mbedtls_x509_crt_free( crt );
1318 return( ret );
1319 }
1320
1321 if( p != end )
1322 {
1323 mbedtls_x509_crt_free( crt );
1324 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT,
1325 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1326 }
1327
1328 return( 0 );
1329 }
1330
1331 /*
1332 * Parse one X.509 certificate in DER format from a buffer and add them to a
1333 * chained list
1334 */
mbedtls_x509_crt_parse_der_internal(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen,int make_copy,mbedtls_x509_crt_ext_cb_t cb,void * p_ctx)1335 static int mbedtls_x509_crt_parse_der_internal( mbedtls_x509_crt *chain,
1336 const unsigned char *buf,
1337 size_t buflen,
1338 int make_copy,
1339 mbedtls_x509_crt_ext_cb_t cb,
1340 void *p_ctx )
1341 {
1342 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1343 mbedtls_x509_crt *crt = chain, *prev = NULL;
1344
1345 /*
1346 * Check for valid input
1347 */
1348 if( crt == NULL || buf == NULL )
1349 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1350
1351 while( crt->version != 0 && crt->next != NULL )
1352 {
1353 prev = crt;
1354 crt = crt->next;
1355 }
1356
1357 /*
1358 * Add new certificate on the end of the chain if needed.
1359 */
1360 if( crt->version != 0 && crt->next == NULL )
1361 {
1362 crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
1363
1364 if( crt->next == NULL )
1365 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
1366
1367 prev = crt;
1368 mbedtls_x509_crt_init( crt->next );
1369 crt = crt->next;
1370 }
1371
1372 ret = x509_crt_parse_der_core( crt, buf, buflen, make_copy, cb, p_ctx );
1373 if( ret != 0 )
1374 {
1375 if( prev )
1376 prev->next = NULL;
1377
1378 if( crt != chain )
1379 mbedtls_free( crt );
1380
1381 return( ret );
1382 }
1383
1384 return( 0 );
1385 }
1386
mbedtls_x509_crt_parse_der_nocopy(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1387 int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
1388 const unsigned char *buf,
1389 size_t buflen )
1390 {
1391 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 0, NULL, NULL ) );
1392 }
1393
mbedtls_x509_crt_parse_der_with_ext_cb(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen,int make_copy,mbedtls_x509_crt_ext_cb_t cb,void * p_ctx)1394 int mbedtls_x509_crt_parse_der_with_ext_cb( mbedtls_x509_crt *chain,
1395 const unsigned char *buf,
1396 size_t buflen,
1397 int make_copy,
1398 mbedtls_x509_crt_ext_cb_t cb,
1399 void *p_ctx )
1400 {
1401 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, make_copy, cb, p_ctx ) );
1402 }
1403
mbedtls_x509_crt_parse_der(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1404 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
1405 const unsigned char *buf,
1406 size_t buflen )
1407 {
1408 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 1, NULL, NULL ) );
1409 }
1410
1411 /*
1412 * Parse one or more PEM certificates from a buffer and add them to the chained
1413 * list
1414 */
mbedtls_x509_crt_parse(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1415 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain,
1416 const unsigned char *buf,
1417 size_t buflen )
1418 {
1419 #if defined(MBEDTLS_PEM_PARSE_C)
1420 int success = 0, first_error = 0, total_failed = 0;
1421 int buf_format = MBEDTLS_X509_FORMAT_DER;
1422 #endif
1423
1424 /*
1425 * Check for valid input
1426 */
1427 if( chain == NULL || buf == NULL )
1428 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1429
1430 /*
1431 * Determine buffer content. Buffer contains either one DER certificate or
1432 * one or more PEM certificates.
1433 */
1434 #if defined(MBEDTLS_PEM_PARSE_C)
1435 if( buflen != 0 && buf[buflen - 1] == '\0' &&
1436 strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
1437 {
1438 buf_format = MBEDTLS_X509_FORMAT_PEM;
1439 }
1440
1441 if( buf_format == MBEDTLS_X509_FORMAT_DER )
1442 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
1443 #else
1444 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
1445 #endif
1446
1447 #if defined(MBEDTLS_PEM_PARSE_C)
1448 if( buf_format == MBEDTLS_X509_FORMAT_PEM )
1449 {
1450 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1451 mbedtls_pem_context pem;
1452
1453 /* 1 rather than 0 since the terminating NULL byte is counted in */
1454 while( buflen > 1 )
1455 {
1456 size_t use_len;
1457 mbedtls_pem_init( &pem );
1458
1459 /* If we get there, we know the string is null-terminated */
1460 ret = mbedtls_pem_read_buffer( &pem,
1461 "-----BEGIN CERTIFICATE-----",
1462 "-----END CERTIFICATE-----",
1463 buf, NULL, 0, &use_len );
1464
1465 if( ret == 0 )
1466 {
1467 /*
1468 * Was PEM encoded
1469 */
1470 buflen -= use_len;
1471 buf += use_len;
1472 }
1473 else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA )
1474 {
1475 return( ret );
1476 }
1477 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1478 {
1479 mbedtls_pem_free( &pem );
1480
1481 /*
1482 * PEM header and footer were found
1483 */
1484 buflen -= use_len;
1485 buf += use_len;
1486
1487 if( first_error == 0 )
1488 first_error = ret;
1489
1490 total_failed++;
1491 continue;
1492 }
1493 else
1494 break;
1495
1496 ret = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen );
1497
1498 mbedtls_pem_free( &pem );
1499
1500 if( ret != 0 )
1501 {
1502 /*
1503 * Quit parsing on a memory error
1504 */
1505 if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED )
1506 return( ret );
1507
1508 if( first_error == 0 )
1509 first_error = ret;
1510
1511 total_failed++;
1512 continue;
1513 }
1514
1515 success = 1;
1516 }
1517 }
1518
1519 if( success )
1520 return( total_failed );
1521 else if( first_error )
1522 return( first_error );
1523 else
1524 return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT );
1525 #endif /* MBEDTLS_PEM_PARSE_C */
1526 }
1527
1528 #if defined(MBEDTLS_FS_IO)
1529 /*
1530 * Load one or more certificates and add them to the chained list
1531 */
mbedtls_x509_crt_parse_file(mbedtls_x509_crt * chain,const char * path)1532 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path )
1533 {
1534 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1535 size_t n;
1536 unsigned char *buf;
1537
1538 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
1539 return( ret );
1540
1541 ret = mbedtls_x509_crt_parse( chain, buf, n );
1542
1543 mbedtls_platform_zeroize( buf, n );
1544 mbedtls_free( buf );
1545
1546 return( ret );
1547 }
1548
mbedtls_x509_crt_parse_path(mbedtls_x509_crt * chain,const char * path)1549 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path )
1550 {
1551 int ret = 0;
1552 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
1553 int w_ret;
1554 WCHAR szDir[MAX_PATH];
1555 char filename[MAX_PATH];
1556 char *p;
1557 size_t len = strlen( path );
1558
1559 WIN32_FIND_DATAW file_data;
1560 HANDLE hFind;
1561
1562 if( len > MAX_PATH - 3 )
1563 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1564
1565 memset( szDir, 0, sizeof(szDir) );
1566 memset( filename, 0, MAX_PATH );
1567 memcpy( filename, path, len );
1568 filename[len++] = '\\';
1569 p = filename + len;
1570 filename[len++] = '*';
1571
1572 w_ret = MultiByteToWideChar( CP_ACP, 0, filename, (int)len, szDir,
1573 MAX_PATH - 3 );
1574 if( w_ret == 0 )
1575 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1576
1577 hFind = FindFirstFileW( szDir, &file_data );
1578 if( hFind == INVALID_HANDLE_VALUE )
1579 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1580
1581 len = MAX_PATH - len;
1582 do
1583 {
1584 memset( p, 0, len );
1585
1586 if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
1587 continue;
1588
1589 w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName,
1590 lstrlenW( file_data.cFileName ),
1591 p, (int) len - 1,
1592 NULL, NULL );
1593 if( w_ret == 0 )
1594 {
1595 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1596 goto cleanup;
1597 }
1598
1599 w_ret = mbedtls_x509_crt_parse_file( chain, filename );
1600 if( w_ret < 0 )
1601 ret++;
1602 else
1603 ret += w_ret;
1604 }
1605 while( FindNextFileW( hFind, &file_data ) != 0 );
1606
1607 if( GetLastError() != ERROR_NO_MORE_FILES )
1608 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1609
1610 cleanup:
1611 FindClose( hFind );
1612 #else /* _WIN32 */
1613 int t_ret;
1614 int snp_ret;
1615 struct stat sb;
1616 struct dirent *entry;
1617 char entry_name[MBEDTLS_X509_MAX_FILE_PATH_LEN];
1618 DIR *dir = opendir( path );
1619
1620 if( dir == NULL )
1621 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1622
1623 #if defined(MBEDTLS_THREADING_C)
1624 if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 )
1625 {
1626 closedir( dir );
1627 return( ret );
1628 }
1629 #endif /* MBEDTLS_THREADING_C */
1630
1631 memset( &sb, 0, sizeof( sb ) );
1632
1633 while( ( entry = readdir( dir ) ) != NULL )
1634 {
1635 snp_ret = mbedtls_snprintf( entry_name, sizeof entry_name,
1636 "%s/%s", path, entry->d_name );
1637
1638 if( snp_ret < 0 || (size_t)snp_ret >= sizeof entry_name )
1639 {
1640 ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
1641 goto cleanup;
1642 }
1643 else if( stat( entry_name, &sb ) == -1 )
1644 {
1645 if( errno == ENOENT )
1646 {
1647 /* Broken symbolic link - ignore this entry.
1648 stat(2) will return this error for either (a) a dangling
1649 symlink or (b) a missing file.
1650 Given that we have just obtained the filename from readdir,
1651 assume that it does exist and therefore treat this as a
1652 dangling symlink. */
1653 continue;
1654 }
1655 else
1656 {
1657 /* Some other file error; report the error. */
1658 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1659 goto cleanup;
1660 }
1661 }
1662
1663 if( !S_ISREG( sb.st_mode ) )
1664 continue;
1665
1666 // Ignore parse errors
1667 //
1668 t_ret = mbedtls_x509_crt_parse_file( chain, entry_name );
1669 if( t_ret < 0 )
1670 ret++;
1671 else
1672 ret += t_ret;
1673 }
1674
1675 cleanup:
1676 closedir( dir );
1677
1678 #if defined(MBEDTLS_THREADING_C)
1679 if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 )
1680 ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
1681 #endif /* MBEDTLS_THREADING_C */
1682
1683 #endif /* _WIN32 */
1684
1685 return( ret );
1686 }
1687 #endif /* MBEDTLS_FS_IO */
1688
1689 /*
1690 * OtherName ::= SEQUENCE {
1691 * type-id OBJECT IDENTIFIER,
1692 * value [0] EXPLICIT ANY DEFINED BY type-id }
1693 *
1694 * HardwareModuleName ::= SEQUENCE {
1695 * hwType OBJECT IDENTIFIER,
1696 * hwSerialNum OCTET STRING }
1697 *
1698 * NOTE: we currently only parse and use otherName of type HwModuleName,
1699 * as defined in RFC 4108.
1700 */
x509_get_other_name(const mbedtls_x509_buf * subject_alt_name,mbedtls_x509_san_other_name * other_name)1701 static int x509_get_other_name( const mbedtls_x509_buf *subject_alt_name,
1702 mbedtls_x509_san_other_name *other_name )
1703 {
1704 int ret = 0;
1705 size_t len;
1706 unsigned char *p = subject_alt_name->p;
1707 const unsigned char *end = p + subject_alt_name->len;
1708 mbedtls_x509_buf cur_oid;
1709
1710 if( ( subject_alt_name->tag &
1711 ( MBEDTLS_ASN1_TAG_CLASS_MASK | MBEDTLS_ASN1_TAG_VALUE_MASK ) ) !=
1712 ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ) )
1713 {
1714 /*
1715 * The given subject alternative name is not of type "othername".
1716 */
1717 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1718 }
1719
1720 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1721 MBEDTLS_ASN1_OID ) ) != 0 )
1722 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1723
1724 cur_oid.tag = MBEDTLS_ASN1_OID;
1725 cur_oid.p = p;
1726 cur_oid.len = len;
1727
1728 /*
1729 * Only HwModuleName is currently supported.
1730 */
1731 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME, &cur_oid ) != 0 )
1732 {
1733 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1734 }
1735
1736 if( p + len >= end )
1737 {
1738 mbedtls_platform_zeroize( other_name, sizeof( *other_name ) );
1739 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1740 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1741 }
1742 p += len;
1743 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1744 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 )
1745 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1746
1747 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1748 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1749 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1750
1751 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OID ) ) != 0 )
1752 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1753
1754 other_name->value.hardware_module_name.oid.tag = MBEDTLS_ASN1_OID;
1755 other_name->value.hardware_module_name.oid.p = p;
1756 other_name->value.hardware_module_name.oid.len = len;
1757
1758 if( p + len >= end )
1759 {
1760 mbedtls_platform_zeroize( other_name, sizeof( *other_name ) );
1761 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1762 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1763 }
1764 p += len;
1765 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1766 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
1767 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1768
1769 other_name->value.hardware_module_name.val.tag = MBEDTLS_ASN1_OCTET_STRING;
1770 other_name->value.hardware_module_name.val.p = p;
1771 other_name->value.hardware_module_name.val.len = len;
1772 p += len;
1773 if( p != end )
1774 {
1775 mbedtls_platform_zeroize( other_name,
1776 sizeof( *other_name ) );
1777 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1778 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1779 }
1780 return( 0 );
1781 }
1782
mbedtls_x509_parse_subject_alt_name(const mbedtls_x509_buf * san_buf,mbedtls_x509_subject_alternative_name * san)1783 int mbedtls_x509_parse_subject_alt_name( const mbedtls_x509_buf *san_buf,
1784 mbedtls_x509_subject_alternative_name *san )
1785 {
1786 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1787 switch( san_buf->tag &
1788 ( MBEDTLS_ASN1_TAG_CLASS_MASK |
1789 MBEDTLS_ASN1_TAG_VALUE_MASK ) )
1790 {
1791 /*
1792 * otherName
1793 */
1794 case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ):
1795 {
1796 mbedtls_x509_san_other_name other_name;
1797
1798 ret = x509_get_other_name( san_buf, &other_name );
1799 if( ret != 0 )
1800 return( ret );
1801
1802 memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) );
1803 san->type = MBEDTLS_X509_SAN_OTHER_NAME;
1804 memcpy( &san->san.other_name,
1805 &other_name, sizeof( other_name ) );
1806
1807 }
1808 break;
1809
1810 /*
1811 * dNSName
1812 */
1813 case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_DNS_NAME ):
1814 {
1815 memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) );
1816 san->type = MBEDTLS_X509_SAN_DNS_NAME;
1817
1818 memcpy( &san->san.unstructured_name,
1819 san_buf, sizeof( *san_buf ) );
1820
1821 }
1822 break;
1823
1824 /*
1825 * Type not supported
1826 */
1827 default:
1828 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1829 }
1830 return( 0 );
1831 }
1832
1833 #if !defined(MBEDTLS_X509_REMOVE_INFO)
x509_info_subject_alt_name(char ** buf,size_t * size,const mbedtls_x509_sequence * subject_alt_name,const char * prefix)1834 static int x509_info_subject_alt_name( char **buf, size_t *size,
1835 const mbedtls_x509_sequence
1836 *subject_alt_name,
1837 const char *prefix )
1838 {
1839 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1840 size_t i;
1841 size_t n = *size;
1842 char *p = *buf;
1843 const mbedtls_x509_sequence *cur = subject_alt_name;
1844 mbedtls_x509_subject_alternative_name san;
1845 int parse_ret;
1846
1847 while( cur != NULL )
1848 {
1849 memset( &san, 0, sizeof( san ) );
1850 parse_ret = mbedtls_x509_parse_subject_alt_name( &cur->buf, &san );
1851 if( parse_ret != 0 )
1852 {
1853 if( parse_ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
1854 {
1855 ret = mbedtls_snprintf( p, n, "\n%s <unsupported>", prefix );
1856 MBEDTLS_X509_SAFE_SNPRINTF;
1857 }
1858 else
1859 {
1860 ret = mbedtls_snprintf( p, n, "\n%s <malformed>", prefix );
1861 MBEDTLS_X509_SAFE_SNPRINTF;
1862 }
1863 cur = cur->next;
1864 continue;
1865 }
1866
1867 switch( san.type )
1868 {
1869 /*
1870 * otherName
1871 */
1872 case MBEDTLS_X509_SAN_OTHER_NAME:
1873 {
1874 mbedtls_x509_san_other_name *other_name = &san.san.other_name;
1875
1876 ret = mbedtls_snprintf( p, n, "\n%s otherName :", prefix );
1877 MBEDTLS_X509_SAFE_SNPRINTF;
1878
1879 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME,
1880 &other_name->value.hardware_module_name.oid ) != 0 )
1881 {
1882 ret = mbedtls_snprintf( p, n, "\n%s hardware module name :", prefix );
1883 MBEDTLS_X509_SAFE_SNPRINTF;
1884 ret = mbedtls_snprintf( p, n, "\n%s hardware type : ", prefix );
1885 MBEDTLS_X509_SAFE_SNPRINTF;
1886
1887 ret = mbedtls_oid_get_numeric_string( p, n, &other_name->value.hardware_module_name.oid );
1888 MBEDTLS_X509_SAFE_SNPRINTF;
1889
1890 ret = mbedtls_snprintf( p, n, "\n%s hardware serial number : ", prefix );
1891 MBEDTLS_X509_SAFE_SNPRINTF;
1892
1893 for( i = 0; i < other_name->value.hardware_module_name.val.len; i++ )
1894 {
1895 ret = mbedtls_snprintf( p, n, "%02X", other_name->value.hardware_module_name.val.p[i] );
1896 MBEDTLS_X509_SAFE_SNPRINTF;
1897 }
1898 }/* MBEDTLS_OID_ON_HW_MODULE_NAME */
1899 }
1900 break;
1901
1902 /*
1903 * dNSName
1904 */
1905 case MBEDTLS_X509_SAN_DNS_NAME:
1906 {
1907 ret = mbedtls_snprintf( p, n, "\n%s dNSName : ", prefix );
1908 MBEDTLS_X509_SAFE_SNPRINTF;
1909 if( san.san.unstructured_name.len >= n )
1910 {
1911 *p = '\0';
1912 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );
1913 }
1914
1915 memcpy( p, san.san.unstructured_name.p, san.san.unstructured_name.len );
1916 p += san.san.unstructured_name.len;
1917 n -= san.san.unstructured_name.len;
1918 }
1919 break;
1920
1921 /*
1922 * Type not supported, skip item.
1923 */
1924 default:
1925 ret = mbedtls_snprintf( p, n, "\n%s <unsupported>", prefix );
1926 MBEDTLS_X509_SAFE_SNPRINTF;
1927 break;
1928 }
1929
1930 cur = cur->next;
1931 }
1932
1933 *p = '\0';
1934
1935 *size = n;
1936 *buf = p;
1937
1938 return( 0 );
1939 }
1940
1941 #define PRINT_ITEM(i) \
1942 { \
1943 ret = mbedtls_snprintf( p, n, "%s" i, sep ); \
1944 MBEDTLS_X509_SAFE_SNPRINTF; \
1945 sep = ", "; \
1946 }
1947
1948 #define CERT_TYPE(type,name) \
1949 if( ns_cert_type & (type) ) \
1950 PRINT_ITEM( name );
1951
x509_info_cert_type(char ** buf,size_t * size,unsigned char ns_cert_type)1952 static int x509_info_cert_type( char **buf, size_t *size,
1953 unsigned char ns_cert_type )
1954 {
1955 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1956 size_t n = *size;
1957 char *p = *buf;
1958 const char *sep = "";
1959
1960 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" );
1961 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" );
1962 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" );
1963 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" );
1964 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" );
1965 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" );
1966 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" );
1967 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" );
1968
1969 *size = n;
1970 *buf = p;
1971
1972 return( 0 );
1973 }
1974
1975 #define KEY_USAGE(code,name) \
1976 if( key_usage & (code) ) \
1977 PRINT_ITEM( name );
1978
x509_info_key_usage(char ** buf,size_t * size,unsigned int key_usage)1979 static int x509_info_key_usage( char **buf, size_t *size,
1980 unsigned int key_usage )
1981 {
1982 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1983 size_t n = *size;
1984 char *p = *buf;
1985 const char *sep = "";
1986
1987 KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" );
1988 KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" );
1989 KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" );
1990 KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" );
1991 KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" );
1992 KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" );
1993 KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" );
1994 KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" );
1995 KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" );
1996
1997 *size = n;
1998 *buf = p;
1999
2000 return( 0 );
2001 }
2002
x509_info_ext_key_usage(char ** buf,size_t * size,const mbedtls_x509_sequence * extended_key_usage)2003 static int x509_info_ext_key_usage( char **buf, size_t *size,
2004 const mbedtls_x509_sequence *extended_key_usage )
2005 {
2006 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2007 const char *desc;
2008 size_t n = *size;
2009 char *p = *buf;
2010 const mbedtls_x509_sequence *cur = extended_key_usage;
2011 const char *sep = "";
2012
2013 while( cur != NULL )
2014 {
2015 if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 )
2016 desc = "???";
2017
2018 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
2019 MBEDTLS_X509_SAFE_SNPRINTF;
2020
2021 sep = ", ";
2022
2023 cur = cur->next;
2024 }
2025
2026 *size = n;
2027 *buf = p;
2028
2029 return( 0 );
2030 }
2031
x509_info_cert_policies(char ** buf,size_t * size,const mbedtls_x509_sequence * certificate_policies)2032 static int x509_info_cert_policies( char **buf, size_t *size,
2033 const mbedtls_x509_sequence *certificate_policies )
2034 {
2035 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2036 const char *desc;
2037 size_t n = *size;
2038 char *p = *buf;
2039 const mbedtls_x509_sequence *cur = certificate_policies;
2040 const char *sep = "";
2041
2042 while( cur != NULL )
2043 {
2044 if( mbedtls_oid_get_certificate_policies( &cur->buf, &desc ) != 0 )
2045 desc = "???";
2046
2047 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
2048 MBEDTLS_X509_SAFE_SNPRINTF;
2049
2050 sep = ", ";
2051
2052 cur = cur->next;
2053 }
2054
2055 *size = n;
2056 *buf = p;
2057
2058 return( 0 );
2059 }
2060
2061 /*
2062 * Return an informational string about the certificate.
2063 */
2064 #define BEFORE_COLON 18
2065 #define BC "18"
mbedtls_x509_crt_info(char * buf,size_t size,const char * prefix,const mbedtls_x509_crt * crt)2066 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
2067 const mbedtls_x509_crt *crt )
2068 {
2069 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2070 size_t n;
2071 char *p;
2072 char key_size_str[BEFORE_COLON];
2073
2074 p = buf;
2075 n = size;
2076
2077 if( NULL == crt )
2078 {
2079 ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" );
2080 MBEDTLS_X509_SAFE_SNPRINTF;
2081
2082 return( (int) ( size - n ) );
2083 }
2084
2085 ret = mbedtls_snprintf( p, n, "%scert. version : %d\n",
2086 prefix, crt->version );
2087 MBEDTLS_X509_SAFE_SNPRINTF;
2088 ret = mbedtls_snprintf( p, n, "%sserial number : ",
2089 prefix );
2090 MBEDTLS_X509_SAFE_SNPRINTF;
2091
2092 ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
2093 MBEDTLS_X509_SAFE_SNPRINTF;
2094
2095 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix );
2096 MBEDTLS_X509_SAFE_SNPRINTF;
2097 ret = mbedtls_x509_dn_gets( p, n, &crt->issuer );
2098 MBEDTLS_X509_SAFE_SNPRINTF;
2099
2100 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
2101 MBEDTLS_X509_SAFE_SNPRINTF;
2102 ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
2103 MBEDTLS_X509_SAFE_SNPRINTF;
2104
2105 ret = mbedtls_snprintf( p, n, "\n%sissued on : " \
2106 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
2107 crt->valid_from.year, crt->valid_from.mon,
2108 crt->valid_from.day, crt->valid_from.hour,
2109 crt->valid_from.min, crt->valid_from.sec );
2110 MBEDTLS_X509_SAFE_SNPRINTF;
2111
2112 ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \
2113 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
2114 crt->valid_to.year, crt->valid_to.mon,
2115 crt->valid_to.day, crt->valid_to.hour,
2116 crt->valid_to.min, crt->valid_to.sec );
2117 MBEDTLS_X509_SAFE_SNPRINTF;
2118
2119 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
2120 MBEDTLS_X509_SAFE_SNPRINTF;
2121
2122 ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk,
2123 crt->sig_md, crt->sig_opts );
2124 MBEDTLS_X509_SAFE_SNPRINTF;
2125
2126 /* Key size */
2127 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
2128 mbedtls_pk_get_name( &crt->pk ) ) ) != 0 )
2129 {
2130 return( ret );
2131 }
2132
2133 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str,
2134 (int) mbedtls_pk_get_bitlen( &crt->pk ) );
2135 MBEDTLS_X509_SAFE_SNPRINTF;
2136
2137 /*
2138 * Optional extensions
2139 */
2140
2141 if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS )
2142 {
2143 ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix,
2144 crt->ca_istrue ? "true" : "false" );
2145 MBEDTLS_X509_SAFE_SNPRINTF;
2146
2147 if( crt->max_pathlen > 0 )
2148 {
2149 ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 );
2150 MBEDTLS_X509_SAFE_SNPRINTF;
2151 }
2152 }
2153
2154 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
2155 {
2156 ret = mbedtls_snprintf( p, n, "\n%ssubject alt name :", prefix );
2157 MBEDTLS_X509_SAFE_SNPRINTF;
2158
2159 if( ( ret = x509_info_subject_alt_name( &p, &n,
2160 &crt->subject_alt_names,
2161 prefix ) ) != 0 )
2162 return( ret );
2163 }
2164
2165 if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE )
2166 {
2167 ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix );
2168 MBEDTLS_X509_SAFE_SNPRINTF;
2169
2170 if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 )
2171 return( ret );
2172 }
2173
2174 if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE )
2175 {
2176 ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix );
2177 MBEDTLS_X509_SAFE_SNPRINTF;
2178
2179 if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 )
2180 return( ret );
2181 }
2182
2183 if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE )
2184 {
2185 ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix );
2186 MBEDTLS_X509_SAFE_SNPRINTF;
2187
2188 if( ( ret = x509_info_ext_key_usage( &p, &n,
2189 &crt->ext_key_usage ) ) != 0 )
2190 return( ret );
2191 }
2192
2193 if( crt->ext_types & MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES )
2194 {
2195 ret = mbedtls_snprintf( p, n, "\n%scertificate policies : ", prefix );
2196 MBEDTLS_X509_SAFE_SNPRINTF;
2197
2198 if( ( ret = x509_info_cert_policies( &p, &n,
2199 &crt->certificate_policies ) ) != 0 )
2200 return( ret );
2201 }
2202
2203 ret = mbedtls_snprintf( p, n, "\n" );
2204 MBEDTLS_X509_SAFE_SNPRINTF;
2205
2206 return( (int) ( size - n ) );
2207 }
2208
2209 struct x509_crt_verify_string {
2210 int code;
2211 const char *string;
2212 };
2213
2214 #define X509_CRT_ERROR_INFO( err, err_str, info ) { err, info },
2215 static const struct x509_crt_verify_string x509_crt_verify_strings[] = {
2216 MBEDTLS_X509_CRT_ERROR_INFO_LIST
2217 { 0, NULL }
2218 };
2219 #undef X509_CRT_ERROR_INFO
2220
mbedtls_x509_crt_verify_info(char * buf,size_t size,const char * prefix,uint32_t flags)2221 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
2222 uint32_t flags )
2223 {
2224 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2225 const struct x509_crt_verify_string *cur;
2226 char *p = buf;
2227 size_t n = size;
2228
2229 for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ )
2230 {
2231 if( ( flags & cur->code ) == 0 )
2232 continue;
2233
2234 ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string );
2235 MBEDTLS_X509_SAFE_SNPRINTF;
2236 flags ^= cur->code;
2237 }
2238
2239 if( flags != 0 )
2240 {
2241 ret = mbedtls_snprintf( p, n, "%sUnknown reason "
2242 "(this should not happen)\n", prefix );
2243 MBEDTLS_X509_SAFE_SNPRINTF;
2244 }
2245
2246 return( (int) ( size - n ) );
2247 }
2248 #endif /* MBEDTLS_X509_REMOVE_INFO */
2249
mbedtls_x509_crt_check_key_usage(const mbedtls_x509_crt * crt,unsigned int usage)2250 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
2251 unsigned int usage )
2252 {
2253 unsigned int usage_must, usage_may;
2254 unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY
2255 | MBEDTLS_X509_KU_DECIPHER_ONLY;
2256
2257 if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 )
2258 return( 0 );
2259
2260 usage_must = usage & ~may_mask;
2261
2262 if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must )
2263 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2264
2265 usage_may = usage & may_mask;
2266
2267 if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may )
2268 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2269
2270 return( 0 );
2271 }
2272
mbedtls_x509_crt_check_extended_key_usage(const mbedtls_x509_crt * crt,const char * usage_oid,size_t usage_len)2273 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
2274 const char *usage_oid,
2275 size_t usage_len )
2276 {
2277 const mbedtls_x509_sequence *cur;
2278
2279 /* Extension is not mandatory, absent means no restriction */
2280 if( ( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 )
2281 return( 0 );
2282
2283 /*
2284 * Look for the requested usage (or wildcard ANY) in our list
2285 */
2286 for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next )
2287 {
2288 const mbedtls_x509_buf *cur_oid = &cur->buf;
2289
2290 if( cur_oid->len == usage_len &&
2291 memcmp( cur_oid->p, usage_oid, usage_len ) == 0 )
2292 {
2293 return( 0 );
2294 }
2295
2296 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 )
2297 return( 0 );
2298 }
2299
2300 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2301 }
2302
2303 #if defined(MBEDTLS_X509_CRL_PARSE_C)
2304 /*
2305 * Return 1 if the certificate is revoked, or 0 otherwise.
2306 */
mbedtls_x509_crt_is_revoked(const mbedtls_x509_crt * crt,const mbedtls_x509_crl * crl)2307 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl )
2308 {
2309 const mbedtls_x509_crl_entry *cur = &crl->entry;
2310
2311 while( cur != NULL && cur->serial.len != 0 )
2312 {
2313 if( crt->serial.len == cur->serial.len &&
2314 memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 )
2315 {
2316 return( 1 );
2317 }
2318
2319 cur = cur->next;
2320 }
2321
2322 return( 0 );
2323 }
2324
2325 /*
2326 * Check that the given certificate is not revoked according to the CRL.
2327 * Skip validation if no CRL for the given CA is present.
2328 */
x509_crt_verifycrl(mbedtls_x509_crt * crt,mbedtls_x509_crt * ca,mbedtls_x509_crl * crl_list,const mbedtls_x509_crt_profile * profile)2329 static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
2330 mbedtls_x509_crl *crl_list,
2331 const mbedtls_x509_crt_profile *profile )
2332 {
2333 int flags = 0;
2334 unsigned char hash[MBEDTLS_HASH_MAX_SIZE];
2335 #if defined(MBEDTLS_USE_PSA_CRYPTO)
2336 psa_algorithm_t psa_algorithm;
2337 #else
2338 const mbedtls_md_info_t *md_info;
2339 #endif /* MBEDTLS_USE_PSA_CRYPTO */
2340 size_t hash_length;
2341
2342 if( ca == NULL )
2343 return( flags );
2344
2345 while( crl_list != NULL )
2346 {
2347 if( crl_list->version == 0 ||
2348 x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 )
2349 {
2350 crl_list = crl_list->next;
2351 continue;
2352 }
2353
2354 /*
2355 * Check if the CA is configured to sign CRLs
2356 */
2357 if( mbedtls_x509_crt_check_key_usage( ca,
2358 MBEDTLS_X509_KU_CRL_SIGN ) != 0 )
2359 {
2360 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2361 break;
2362 }
2363
2364 /*
2365 * Check if CRL is correctly signed by the trusted CA
2366 */
2367 if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 )
2368 flags |= MBEDTLS_X509_BADCRL_BAD_MD;
2369
2370 if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 )
2371 flags |= MBEDTLS_X509_BADCRL_BAD_PK;
2372
2373 #if defined(MBEDTLS_USE_PSA_CRYPTO)
2374 psa_algorithm = mbedtls_hash_info_psa_from_md( crl_list->sig_md );
2375 if( psa_hash_compute( psa_algorithm,
2376 crl_list->tbs.p,
2377 crl_list->tbs.len,
2378 hash,
2379 sizeof( hash ),
2380 &hash_length ) != PSA_SUCCESS )
2381 {
2382 /* Note: this can't happen except after an internal error */
2383 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2384 break;
2385 }
2386 #else
2387 md_info = mbedtls_md_info_from_type( crl_list->sig_md );
2388 hash_length = mbedtls_md_get_size( md_info );
2389 if( mbedtls_md( md_info,
2390 crl_list->tbs.p,
2391 crl_list->tbs.len,
2392 hash ) != 0 )
2393 {
2394 /* Note: this can't happen except after an internal error */
2395 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2396 break;
2397 }
2398 #endif /* MBEDTLS_USE_PSA_CRYPTO */
2399
2400 if( x509_profile_check_key( profile, &ca->pk ) != 0 )
2401 flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
2402
2403 if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk,
2404 crl_list->sig_md, hash, hash_length,
2405 crl_list->sig.p, crl_list->sig.len ) != 0 )
2406 {
2407 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2408 break;
2409 }
2410
2411 /*
2412 * Check for validity of CRL (Do not drop out)
2413 */
2414 if( mbedtls_x509_time_is_past( &crl_list->next_update ) )
2415 flags |= MBEDTLS_X509_BADCRL_EXPIRED;
2416
2417 if( mbedtls_x509_time_is_future( &crl_list->this_update ) )
2418 flags |= MBEDTLS_X509_BADCRL_FUTURE;
2419
2420 /*
2421 * Check if certificate is revoked
2422 */
2423 if( mbedtls_x509_crt_is_revoked( crt, crl_list ) )
2424 {
2425 flags |= MBEDTLS_X509_BADCERT_REVOKED;
2426 break;
2427 }
2428
2429 crl_list = crl_list->next;
2430 }
2431
2432 return( flags );
2433 }
2434 #endif /* MBEDTLS_X509_CRL_PARSE_C */
2435
2436 /*
2437 * Check the signature of a certificate by its parent
2438 */
x509_crt_check_signature(const mbedtls_x509_crt * child,mbedtls_x509_crt * parent,mbedtls_x509_crt_restart_ctx * rs_ctx)2439 static int x509_crt_check_signature( const mbedtls_x509_crt *child,
2440 mbedtls_x509_crt *parent,
2441 mbedtls_x509_crt_restart_ctx *rs_ctx )
2442 {
2443 size_t hash_len;
2444 unsigned char hash[MBEDTLS_HASH_MAX_SIZE];
2445 #if !defined(MBEDTLS_USE_PSA_CRYPTO)
2446 const mbedtls_md_info_t *md_info;
2447 md_info = mbedtls_md_info_from_type( child->sig_md );
2448 hash_len = mbedtls_md_get_size( md_info );
2449
2450 /* Note: hash errors can happen only after an internal error */
2451 if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 )
2452 return( -1 );
2453 #else
2454 psa_algorithm_t hash_alg = mbedtls_hash_info_psa_from_md( child->sig_md );
2455 psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
2456
2457 status = psa_hash_compute( hash_alg,
2458 child->tbs.p,
2459 child->tbs.len,
2460 hash,
2461 sizeof( hash ),
2462 &hash_len );
2463 if( status != PSA_SUCCESS )
2464 {
2465 return( MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED );
2466 }
2467
2468 #endif /* MBEDTLS_USE_PSA_CRYPTO */
2469 /* Skip expensive computation on obvious mismatch */
2470 if( ! mbedtls_pk_can_do( &parent->pk, child->sig_pk ) )
2471 return( -1 );
2472
2473 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2474 if( rs_ctx != NULL && child->sig_pk == MBEDTLS_PK_ECDSA )
2475 {
2476 return( mbedtls_pk_verify_restartable( &parent->pk,
2477 child->sig_md, hash, hash_len,
2478 child->sig.p, child->sig.len, &rs_ctx->pk ) );
2479 }
2480 #else
2481 (void) rs_ctx;
2482 #endif
2483
2484 return( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk,
2485 child->sig_md, hash, hash_len,
2486 child->sig.p, child->sig.len ) );
2487 }
2488
2489 /*
2490 * Check if 'parent' is a suitable parent (signing CA) for 'child'.
2491 * Return 0 if yes, -1 if not.
2492 *
2493 * top means parent is a locally-trusted certificate
2494 */
x509_crt_check_parent(const mbedtls_x509_crt * child,const mbedtls_x509_crt * parent,int top)2495 static int x509_crt_check_parent( const mbedtls_x509_crt *child,
2496 const mbedtls_x509_crt *parent,
2497 int top )
2498 {
2499 int need_ca_bit;
2500
2501 /* Parent must be the issuer */
2502 if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 )
2503 return( -1 );
2504
2505 /* Parent must have the basicConstraints CA bit set as a general rule */
2506 need_ca_bit = 1;
2507
2508 /* Exception: v1/v2 certificates that are locally trusted. */
2509 if( top && parent->version < 3 )
2510 need_ca_bit = 0;
2511
2512 if( need_ca_bit && ! parent->ca_istrue )
2513 return( -1 );
2514
2515 if( need_ca_bit &&
2516 mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 )
2517 {
2518 return( -1 );
2519 }
2520
2521 return( 0 );
2522 }
2523
2524 /*
2525 * Find a suitable parent for child in candidates, or return NULL.
2526 *
2527 * Here suitable is defined as:
2528 * 1. subject name matches child's issuer
2529 * 2. if necessary, the CA bit is set and key usage allows signing certs
2530 * 3. for trusted roots, the signature is correct
2531 * (for intermediates, the signature is checked and the result reported)
2532 * 4. pathlen constraints are satisfied
2533 *
2534 * If there's a suitable candidate which is also time-valid, return the first
2535 * such. Otherwise, return the first suitable candidate (or NULL if there is
2536 * none).
2537 *
2538 * The rationale for this rule is that someone could have a list of trusted
2539 * roots with two versions on the same root with different validity periods.
2540 * (At least one user reported having such a list and wanted it to just work.)
2541 * The reason we don't just require time-validity is that generally there is
2542 * only one version, and if it's expired we want the flags to state that
2543 * rather than NOT_TRUSTED, as would be the case if we required it here.
2544 *
2545 * The rationale for rule 3 (signature for trusted roots) is that users might
2546 * have two versions of the same CA with different keys in their list, and the
2547 * way we select the correct one is by checking the signature (as we don't
2548 * rely on key identifier extensions). (This is one way users might choose to
2549 * handle key rollover, another relies on self-issued certs, see [SIRO].)
2550 *
2551 * Arguments:
2552 * - [in] child: certificate for which we're looking for a parent
2553 * - [in] candidates: chained list of potential parents
2554 * - [out] r_parent: parent found (or NULL)
2555 * - [out] r_signature_is_good: 1 if child signature by parent is valid, or 0
2556 * - [in] top: 1 if candidates consists of trusted roots, ie we're at the top
2557 * of the chain, 0 otherwise
2558 * - [in] path_cnt: number of intermediates seen so far
2559 * - [in] self_cnt: number of self-signed intermediates seen so far
2560 * (will never be greater than path_cnt)
2561 * - [in-out] rs_ctx: context for restarting operations
2562 *
2563 * Return value:
2564 * - 0 on success
2565 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
2566 */
x509_crt_find_parent_in(mbedtls_x509_crt * child,mbedtls_x509_crt * candidates,mbedtls_x509_crt ** r_parent,int * r_signature_is_good,int top,unsigned path_cnt,unsigned self_cnt,mbedtls_x509_crt_restart_ctx * rs_ctx)2567 static int x509_crt_find_parent_in(
2568 mbedtls_x509_crt *child,
2569 mbedtls_x509_crt *candidates,
2570 mbedtls_x509_crt **r_parent,
2571 int *r_signature_is_good,
2572 int top,
2573 unsigned path_cnt,
2574 unsigned self_cnt,
2575 mbedtls_x509_crt_restart_ctx *rs_ctx )
2576 {
2577 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2578 mbedtls_x509_crt *parent, *fallback_parent;
2579 int signature_is_good = 0, fallback_signature_is_good;
2580
2581 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2582 /* did we have something in progress? */
2583 if( rs_ctx != NULL && rs_ctx->parent != NULL )
2584 {
2585 /* restore saved state */
2586 parent = rs_ctx->parent;
2587 fallback_parent = rs_ctx->fallback_parent;
2588 fallback_signature_is_good = rs_ctx->fallback_signature_is_good;
2589
2590 /* clear saved state */
2591 rs_ctx->parent = NULL;
2592 rs_ctx->fallback_parent = NULL;
2593 rs_ctx->fallback_signature_is_good = 0;
2594
2595 /* resume where we left */
2596 goto check_signature;
2597 }
2598 #endif
2599
2600 fallback_parent = NULL;
2601 fallback_signature_is_good = 0;
2602
2603 for( parent = candidates; parent != NULL; parent = parent->next )
2604 {
2605 /* basic parenting skills (name, CA bit, key usage) */
2606 if( x509_crt_check_parent( child, parent, top ) != 0 )
2607 continue;
2608
2609 /* +1 because stored max_pathlen is 1 higher that the actual value */
2610 if( parent->max_pathlen > 0 &&
2611 (size_t) parent->max_pathlen < 1 + path_cnt - self_cnt )
2612 {
2613 continue;
2614 }
2615
2616 /* Signature */
2617 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2618 check_signature:
2619 #endif
2620 ret = x509_crt_check_signature( child, parent, rs_ctx );
2621
2622 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2623 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2624 {
2625 /* save state */
2626 rs_ctx->parent = parent;
2627 rs_ctx->fallback_parent = fallback_parent;
2628 rs_ctx->fallback_signature_is_good = fallback_signature_is_good;
2629
2630 return( ret );
2631 }
2632 #else
2633 (void) ret;
2634 #endif
2635
2636 signature_is_good = ret == 0;
2637 if( top && ! signature_is_good )
2638 continue;
2639
2640 /* optional time check */
2641 if( mbedtls_x509_time_is_past( &parent->valid_to ) ||
2642 mbedtls_x509_time_is_future( &parent->valid_from ) )
2643 {
2644 if( fallback_parent == NULL )
2645 {
2646 fallback_parent = parent;
2647 fallback_signature_is_good = signature_is_good;
2648 }
2649
2650 continue;
2651 }
2652
2653 *r_parent = parent;
2654 *r_signature_is_good = signature_is_good;
2655
2656 break;
2657 }
2658
2659 if( parent == NULL )
2660 {
2661 *r_parent = fallback_parent;
2662 *r_signature_is_good = fallback_signature_is_good;
2663 }
2664
2665 return( 0 );
2666 }
2667
2668 /*
2669 * Find a parent in trusted CAs or the provided chain, or return NULL.
2670 *
2671 * Searches in trusted CAs first, and return the first suitable parent found
2672 * (see find_parent_in() for definition of suitable).
2673 *
2674 * Arguments:
2675 * - [in] child: certificate for which we're looking for a parent, followed
2676 * by a chain of possible intermediates
2677 * - [in] trust_ca: list of locally trusted certificates
2678 * - [out] parent: parent found (or NULL)
2679 * - [out] parent_is_trusted: 1 if returned `parent` is trusted, or 0
2680 * - [out] signature_is_good: 1 if child signature by parent is valid, or 0
2681 * - [in] path_cnt: number of links in the chain so far (EE -> ... -> child)
2682 * - [in] self_cnt: number of self-signed certs in the chain so far
2683 * (will always be no greater than path_cnt)
2684 * - [in-out] rs_ctx: context for restarting operations
2685 *
2686 * Return value:
2687 * - 0 on success
2688 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
2689 */
x509_crt_find_parent(mbedtls_x509_crt * child,mbedtls_x509_crt * trust_ca,mbedtls_x509_crt ** parent,int * parent_is_trusted,int * signature_is_good,unsigned path_cnt,unsigned self_cnt,mbedtls_x509_crt_restart_ctx * rs_ctx)2690 static int x509_crt_find_parent(
2691 mbedtls_x509_crt *child,
2692 mbedtls_x509_crt *trust_ca,
2693 mbedtls_x509_crt **parent,
2694 int *parent_is_trusted,
2695 int *signature_is_good,
2696 unsigned path_cnt,
2697 unsigned self_cnt,
2698 mbedtls_x509_crt_restart_ctx *rs_ctx )
2699 {
2700 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2701 mbedtls_x509_crt *search_list;
2702
2703 *parent_is_trusted = 1;
2704
2705 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2706 /* restore then clear saved state if we have some stored */
2707 if( rs_ctx != NULL && rs_ctx->parent_is_trusted != -1 )
2708 {
2709 *parent_is_trusted = rs_ctx->parent_is_trusted;
2710 rs_ctx->parent_is_trusted = -1;
2711 }
2712 #endif
2713
2714 while( 1 ) {
2715 search_list = *parent_is_trusted ? trust_ca : child->next;
2716
2717 ret = x509_crt_find_parent_in( child, search_list,
2718 parent, signature_is_good,
2719 *parent_is_trusted,
2720 path_cnt, self_cnt, rs_ctx );
2721
2722 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2723 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2724 {
2725 /* save state */
2726 rs_ctx->parent_is_trusted = *parent_is_trusted;
2727 return( ret );
2728 }
2729 #else
2730 (void) ret;
2731 #endif
2732
2733 /* stop here if found or already in second iteration */
2734 if( *parent != NULL || *parent_is_trusted == 0 )
2735 break;
2736
2737 /* prepare second iteration */
2738 *parent_is_trusted = 0;
2739 }
2740
2741 /* extra precaution against mistakes in the caller */
2742 if( *parent == NULL )
2743 {
2744 *parent_is_trusted = 0;
2745 *signature_is_good = 0;
2746 }
2747
2748 return( 0 );
2749 }
2750
2751 /*
2752 * Check if an end-entity certificate is locally trusted
2753 *
2754 * Currently we require such certificates to be self-signed (actually only
2755 * check for self-issued as self-signatures are not checked)
2756 */
x509_crt_check_ee_locally_trusted(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca)2757 static int x509_crt_check_ee_locally_trusted(
2758 mbedtls_x509_crt *crt,
2759 mbedtls_x509_crt *trust_ca )
2760 {
2761 mbedtls_x509_crt *cur;
2762
2763 /* must be self-issued */
2764 if( x509_name_cmp( &crt->issuer, &crt->subject ) != 0 )
2765 return( -1 );
2766
2767 /* look for an exact match with trusted cert */
2768 for( cur = trust_ca; cur != NULL; cur = cur->next )
2769 {
2770 if( crt->raw.len == cur->raw.len &&
2771 memcmp( crt->raw.p, cur->raw.p, crt->raw.len ) == 0 )
2772 {
2773 return( 0 );
2774 }
2775 }
2776
2777 /* too bad */
2778 return( -1 );
2779 }
2780
2781 /*
2782 * Build and verify a certificate chain
2783 *
2784 * Given a peer-provided list of certificates EE, C1, ..., Cn and
2785 * a list of trusted certs R1, ... Rp, try to build and verify a chain
2786 * EE, Ci1, ... Ciq [, Rj]
2787 * such that every cert in the chain is a child of the next one,
2788 * jumping to a trusted root as early as possible.
2789 *
2790 * Verify that chain and return it with flags for all issues found.
2791 *
2792 * Special cases:
2793 * - EE == Rj -> return a one-element list containing it
2794 * - EE, Ci1, ..., Ciq cannot be continued with a trusted root
2795 * -> return that chain with NOT_TRUSTED set on Ciq
2796 *
2797 * Tests for (aspects of) this function should include at least:
2798 * - trusted EE
2799 * - EE -> trusted root
2800 * - EE -> intermediate CA -> trusted root
2801 * - if relevant: EE untrusted
2802 * - if relevant: EE -> intermediate, untrusted
2803 * with the aspect under test checked at each relevant level (EE, int, root).
2804 * For some aspects longer chains are required, but usually length 2 is
2805 * enough (but length 1 is not in general).
2806 *
2807 * Arguments:
2808 * - [in] crt: the cert list EE, C1, ..., Cn
2809 * - [in] trust_ca: the trusted list R1, ..., Rp
2810 * - [in] ca_crl, profile: as in verify_with_profile()
2811 * - [out] ver_chain: the built and verified chain
2812 * Only valid when return value is 0, may contain garbage otherwise!
2813 * Restart note: need not be the same when calling again to resume.
2814 * - [in-out] rs_ctx: context for restarting operations
2815 *
2816 * Return value:
2817 * - non-zero if the chain could not be fully built and examined
2818 * - 0 is the chain was successfully built and examined,
2819 * even if it was found to be invalid
2820 */
x509_crt_verify_chain(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca,mbedtls_x509_crl * ca_crl,mbedtls_x509_crt_ca_cb_t f_ca_cb,void * p_ca_cb,const mbedtls_x509_crt_profile * profile,mbedtls_x509_crt_verify_chain * ver_chain,mbedtls_x509_crt_restart_ctx * rs_ctx)2821 static int x509_crt_verify_chain(
2822 mbedtls_x509_crt *crt,
2823 mbedtls_x509_crt *trust_ca,
2824 mbedtls_x509_crl *ca_crl,
2825 mbedtls_x509_crt_ca_cb_t f_ca_cb,
2826 void *p_ca_cb,
2827 const mbedtls_x509_crt_profile *profile,
2828 mbedtls_x509_crt_verify_chain *ver_chain,
2829 mbedtls_x509_crt_restart_ctx *rs_ctx )
2830 {
2831 /* Don't initialize any of those variables here, so that the compiler can
2832 * catch potential issues with jumping ahead when restarting */
2833 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2834 uint32_t *flags;
2835 mbedtls_x509_crt_verify_chain_item *cur;
2836 mbedtls_x509_crt *child;
2837 mbedtls_x509_crt *parent;
2838 int parent_is_trusted;
2839 int child_is_trusted;
2840 int signature_is_good;
2841 unsigned self_cnt;
2842 mbedtls_x509_crt *cur_trust_ca = NULL;
2843
2844 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2845 /* resume if we had an operation in progress */
2846 if( rs_ctx != NULL && rs_ctx->in_progress == x509_crt_rs_find_parent )
2847 {
2848 /* restore saved state */
2849 *ver_chain = rs_ctx->ver_chain; /* struct copy */
2850 self_cnt = rs_ctx->self_cnt;
2851
2852 /* restore derived state */
2853 cur = &ver_chain->items[ver_chain->len - 1];
2854 child = cur->crt;
2855 flags = &cur->flags;
2856
2857 goto find_parent;
2858 }
2859 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
2860
2861 child = crt;
2862 self_cnt = 0;
2863 parent_is_trusted = 0;
2864 child_is_trusted = 0;
2865
2866 while( 1 ) {
2867 /* Add certificate to the verification chain */
2868 cur = &ver_chain->items[ver_chain->len];
2869 cur->crt = child;
2870 cur->flags = 0;
2871 ver_chain->len++;
2872 flags = &cur->flags;
2873
2874 /* Check time-validity (all certificates) */
2875 if( mbedtls_x509_time_is_past( &child->valid_to ) )
2876 *flags |= MBEDTLS_X509_BADCERT_EXPIRED;
2877
2878 if( mbedtls_x509_time_is_future( &child->valid_from ) )
2879 *flags |= MBEDTLS_X509_BADCERT_FUTURE;
2880
2881 /* Stop here for trusted roots (but not for trusted EE certs) */
2882 if( child_is_trusted )
2883 return( 0 );
2884
2885 /* Check signature algorithm: MD & PK algs */
2886 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
2887 *flags |= MBEDTLS_X509_BADCERT_BAD_MD;
2888
2889 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
2890 *flags |= MBEDTLS_X509_BADCERT_BAD_PK;
2891
2892 /* Special case: EE certs that are locally trusted */
2893 if( ver_chain->len == 1 &&
2894 x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 )
2895 {
2896 return( 0 );
2897 }
2898
2899 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2900 find_parent:
2901 #endif
2902
2903 /* Obtain list of potential trusted signers from CA callback,
2904 * or use statically provided list. */
2905 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
2906 if( f_ca_cb != NULL )
2907 {
2908 mbedtls_x509_crt_free( ver_chain->trust_ca_cb_result );
2909 mbedtls_free( ver_chain->trust_ca_cb_result );
2910 ver_chain->trust_ca_cb_result = NULL;
2911
2912 ret = f_ca_cb( p_ca_cb, child, &ver_chain->trust_ca_cb_result );
2913 if( ret != 0 )
2914 return( MBEDTLS_ERR_X509_FATAL_ERROR );
2915
2916 cur_trust_ca = ver_chain->trust_ca_cb_result;
2917 }
2918 else
2919 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
2920 {
2921 ((void) f_ca_cb);
2922 ((void) p_ca_cb);
2923 cur_trust_ca = trust_ca;
2924 }
2925
2926 /* Look for a parent in trusted CAs or up the chain */
2927 ret = x509_crt_find_parent( child, cur_trust_ca, &parent,
2928 &parent_is_trusted, &signature_is_good,
2929 ver_chain->len - 1, self_cnt, rs_ctx );
2930
2931 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2932 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2933 {
2934 /* save state */
2935 rs_ctx->in_progress = x509_crt_rs_find_parent;
2936 rs_ctx->self_cnt = self_cnt;
2937 rs_ctx->ver_chain = *ver_chain; /* struct copy */
2938
2939 return( ret );
2940 }
2941 #else
2942 (void) ret;
2943 #endif
2944
2945 /* No parent? We're done here */
2946 if( parent == NULL )
2947 {
2948 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2949 return( 0 );
2950 }
2951
2952 /* Count intermediate self-issued (not necessarily self-signed) certs.
2953 * These can occur with some strategies for key rollover, see [SIRO],
2954 * and should be excluded from max_pathlen checks. */
2955 if( ver_chain->len != 1 &&
2956 x509_name_cmp( &child->issuer, &child->subject ) == 0 )
2957 {
2958 self_cnt++;
2959 }
2960
2961 /* path_cnt is 0 for the first intermediate CA,
2962 * and if parent is trusted it's not an intermediate CA */
2963 if( ! parent_is_trusted &&
2964 ver_chain->len > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
2965 {
2966 /* return immediately to avoid overflow the chain array */
2967 return( MBEDTLS_ERR_X509_FATAL_ERROR );
2968 }
2969
2970 /* signature was checked while searching parent */
2971 if( ! signature_is_good )
2972 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2973
2974 /* check size of signing key */
2975 if( x509_profile_check_key( profile, &parent->pk ) != 0 )
2976 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
2977
2978 #if defined(MBEDTLS_X509_CRL_PARSE_C)
2979 /* Check trusted CA's CRL for the given crt */
2980 *flags |= x509_crt_verifycrl( child, parent, ca_crl, profile );
2981 #else
2982 (void) ca_crl;
2983 #endif
2984
2985 /* prepare for next iteration */
2986 child = parent;
2987 parent = NULL;
2988 child_is_trusted = parent_is_trusted;
2989 signature_is_good = 0;
2990 }
2991 }
2992
2993 /*
2994 * Check for CN match
2995 */
x509_crt_check_cn(const mbedtls_x509_buf * name,const char * cn,size_t cn_len)2996 static int x509_crt_check_cn( const mbedtls_x509_buf *name,
2997 const char *cn, size_t cn_len )
2998 {
2999 /* try exact match */
3000 if( name->len == cn_len &&
3001 x509_memcasecmp( cn, name->p, cn_len ) == 0 )
3002 {
3003 return( 0 );
3004 }
3005
3006 /* try wildcard match */
3007 if( x509_check_wildcard( cn, name ) == 0 )
3008 {
3009 return( 0 );
3010 }
3011
3012 return( -1 );
3013 }
3014
3015 /*
3016 * Check for SAN match, see RFC 5280 Section 4.2.1.6
3017 */
x509_crt_check_san(const mbedtls_x509_buf * name,const char * cn,size_t cn_len)3018 static int x509_crt_check_san( const mbedtls_x509_buf *name,
3019 const char *cn, size_t cn_len )
3020 {
3021 const unsigned char san_type = (unsigned char) name->tag &
3022 MBEDTLS_ASN1_TAG_VALUE_MASK;
3023
3024 /* dNSName */
3025 if( san_type == MBEDTLS_X509_SAN_DNS_NAME )
3026 return( x509_crt_check_cn( name, cn, cn_len ) );
3027
3028 /* (We may handle other types here later.) */
3029
3030 /* Unrecognized type */
3031 return( -1 );
3032 }
3033
3034 /*
3035 * Verify the requested CN - only call this if cn is not NULL!
3036 */
x509_crt_verify_name(const mbedtls_x509_crt * crt,const char * cn,uint32_t * flags)3037 static void x509_crt_verify_name( const mbedtls_x509_crt *crt,
3038 const char *cn,
3039 uint32_t *flags )
3040 {
3041 const mbedtls_x509_name *name;
3042 const mbedtls_x509_sequence *cur;
3043 size_t cn_len = strlen( cn );
3044
3045 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
3046 {
3047 for( cur = &crt->subject_alt_names; cur != NULL; cur = cur->next )
3048 {
3049 if( x509_crt_check_san( &cur->buf, cn, cn_len ) == 0 )
3050 break;
3051 }
3052
3053 if( cur == NULL )
3054 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
3055 }
3056 else
3057 {
3058 for( name = &crt->subject; name != NULL; name = name->next )
3059 {
3060 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 &&
3061 x509_crt_check_cn( &name->val, cn, cn_len ) == 0 )
3062 {
3063 break;
3064 }
3065 }
3066
3067 if( name == NULL )
3068 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
3069 }
3070 }
3071
3072 /*
3073 * Merge the flags for all certs in the chain, after calling callback
3074 */
x509_crt_merge_flags_with_cb(uint32_t * flags,const mbedtls_x509_crt_verify_chain * ver_chain,int (* f_vrfy)(void *,mbedtls_x509_crt *,int,uint32_t *),void * p_vrfy)3075 static int x509_crt_merge_flags_with_cb(
3076 uint32_t *flags,
3077 const mbedtls_x509_crt_verify_chain *ver_chain,
3078 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3079 void *p_vrfy )
3080 {
3081 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
3082 unsigned i;
3083 uint32_t cur_flags;
3084 const mbedtls_x509_crt_verify_chain_item *cur;
3085
3086 for( i = ver_chain->len; i != 0; --i )
3087 {
3088 cur = &ver_chain->items[i-1];
3089 cur_flags = cur->flags;
3090
3091 if( NULL != f_vrfy )
3092 if( ( ret = f_vrfy( p_vrfy, cur->crt, (int) i-1, &cur_flags ) ) != 0 )
3093 return( ret );
3094
3095 *flags |= cur_flags;
3096 }
3097
3098 return( 0 );
3099 }
3100
3101 /*
3102 * Verify the certificate validity, with profile, restartable version
3103 *
3104 * This function:
3105 * - checks the requested CN (if any)
3106 * - checks the type and size of the EE cert's key,
3107 * as that isn't done as part of chain building/verification currently
3108 * - builds and verifies the chain
3109 * - then calls the callback and merges the flags
3110 *
3111 * The parameters pairs `trust_ca`, `ca_crl` and `f_ca_cb`, `p_ca_cb`
3112 * are mutually exclusive: If `f_ca_cb != NULL`, it will be used by the
3113 * verification routine to search for trusted signers, and CRLs will
3114 * be disabled. Otherwise, `trust_ca` will be used as the static list
3115 * of trusted signers, and `ca_crl` will be use as the static list
3116 * of CRLs.
3117 */
x509_crt_verify_restartable_ca_cb(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca,mbedtls_x509_crl * ca_crl,mbedtls_x509_crt_ca_cb_t f_ca_cb,void * p_ca_cb,const mbedtls_x509_crt_profile * profile,const char * cn,uint32_t * flags,int (* f_vrfy)(void *,mbedtls_x509_crt *,int,uint32_t *),void * p_vrfy,mbedtls_x509_crt_restart_ctx * rs_ctx)3118 static int x509_crt_verify_restartable_ca_cb( mbedtls_x509_crt *crt,
3119 mbedtls_x509_crt *trust_ca,
3120 mbedtls_x509_crl *ca_crl,
3121 mbedtls_x509_crt_ca_cb_t f_ca_cb,
3122 void *p_ca_cb,
3123 const mbedtls_x509_crt_profile *profile,
3124 const char *cn, uint32_t *flags,
3125 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3126 void *p_vrfy,
3127 mbedtls_x509_crt_restart_ctx *rs_ctx )
3128 {
3129 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
3130 mbedtls_pk_type_t pk_type;
3131 mbedtls_x509_crt_verify_chain ver_chain;
3132 uint32_t ee_flags;
3133
3134 *flags = 0;
3135 ee_flags = 0;
3136 x509_crt_verify_chain_reset( &ver_chain );
3137
3138 if( profile == NULL )
3139 {
3140 ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA;
3141 goto exit;
3142 }
3143
3144 /* check name if requested */
3145 if( cn != NULL )
3146 x509_crt_verify_name( crt, cn, &ee_flags );
3147
3148 /* Check the type and size of the key */
3149 pk_type = mbedtls_pk_get_type( &crt->pk );
3150
3151 if( x509_profile_check_pk_alg( profile, pk_type ) != 0 )
3152 ee_flags |= MBEDTLS_X509_BADCERT_BAD_PK;
3153
3154 if( x509_profile_check_key( profile, &crt->pk ) != 0 )
3155 ee_flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
3156
3157 /* Check the chain */
3158 ret = x509_crt_verify_chain( crt, trust_ca, ca_crl,
3159 f_ca_cb, p_ca_cb, profile,
3160 &ver_chain, rs_ctx );
3161
3162 if( ret != 0 )
3163 goto exit;
3164
3165 /* Merge end-entity flags */
3166 ver_chain.items[0].flags |= ee_flags;
3167
3168 /* Build final flags, calling callback on the way if any */
3169 ret = x509_crt_merge_flags_with_cb( flags, &ver_chain, f_vrfy, p_vrfy );
3170
3171 exit:
3172
3173 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
3174 mbedtls_x509_crt_free( ver_chain.trust_ca_cb_result );
3175 mbedtls_free( ver_chain.trust_ca_cb_result );
3176 ver_chain.trust_ca_cb_result = NULL;
3177 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
3178
3179 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
3180 if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
3181 mbedtls_x509_crt_restart_free( rs_ctx );
3182 #endif
3183
3184 /* prevent misuse of the vrfy callback - VERIFY_FAILED would be ignored by
3185 * the SSL module for authmode optional, but non-zero return from the
3186 * callback means a fatal error so it shouldn't be ignored */
3187 if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
3188 ret = MBEDTLS_ERR_X509_FATAL_ERROR;
3189
3190 if( ret != 0 )
3191 {
3192 *flags = (uint32_t) -1;
3193 return( ret );
3194 }
3195
3196 if( *flags != 0 )
3197 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED );
3198
3199 return( 0 );
3200 }
3201
3202
3203 /*
3204 * Verify the certificate validity (default profile, not restartable)
3205 */
mbedtls_x509_crt_verify(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca,mbedtls_x509_crl * ca_crl,const char * cn,uint32_t * flags,int (* f_vrfy)(void *,mbedtls_x509_crt *,int,uint32_t *),void * p_vrfy)3206 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
3207 mbedtls_x509_crt *trust_ca,
3208 mbedtls_x509_crl *ca_crl,
3209 const char *cn, uint32_t *flags,
3210 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3211 void *p_vrfy )
3212 {
3213 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3214 NULL, NULL,
3215 &mbedtls_x509_crt_profile_default,
3216 cn, flags,
3217 f_vrfy, p_vrfy, NULL ) );
3218 }
3219
3220 /*
3221 * Verify the certificate validity (user-chosen profile, not restartable)
3222 */
mbedtls_x509_crt_verify_with_profile(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca,mbedtls_x509_crl * ca_crl,const mbedtls_x509_crt_profile * profile,const char * cn,uint32_t * flags,int (* f_vrfy)(void *,mbedtls_x509_crt *,int,uint32_t *),void * p_vrfy)3223 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
3224 mbedtls_x509_crt *trust_ca,
3225 mbedtls_x509_crl *ca_crl,
3226 const mbedtls_x509_crt_profile *profile,
3227 const char *cn, uint32_t *flags,
3228 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3229 void *p_vrfy )
3230 {
3231 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3232 NULL, NULL,
3233 profile, cn, flags,
3234 f_vrfy, p_vrfy, NULL ) );
3235 }
3236
3237 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
3238 /*
3239 * Verify the certificate validity (user-chosen profile, CA callback,
3240 * not restartable).
3241 */
mbedtls_x509_crt_verify_with_ca_cb(mbedtls_x509_crt * crt,mbedtls_x509_crt_ca_cb_t f_ca_cb,void * p_ca_cb,const mbedtls_x509_crt_profile * profile,const char * cn,uint32_t * flags,int (* f_vrfy)(void *,mbedtls_x509_crt *,int,uint32_t *),void * p_vrfy)3242 int mbedtls_x509_crt_verify_with_ca_cb( mbedtls_x509_crt *crt,
3243 mbedtls_x509_crt_ca_cb_t f_ca_cb,
3244 void *p_ca_cb,
3245 const mbedtls_x509_crt_profile *profile,
3246 const char *cn, uint32_t *flags,
3247 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3248 void *p_vrfy )
3249 {
3250 return( x509_crt_verify_restartable_ca_cb( crt, NULL, NULL,
3251 f_ca_cb, p_ca_cb,
3252 profile, cn, flags,
3253 f_vrfy, p_vrfy, NULL ) );
3254 }
3255 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
3256
mbedtls_x509_crt_verify_restartable(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca,mbedtls_x509_crl * ca_crl,const mbedtls_x509_crt_profile * profile,const char * cn,uint32_t * flags,int (* f_vrfy)(void *,mbedtls_x509_crt *,int,uint32_t *),void * p_vrfy,mbedtls_x509_crt_restart_ctx * rs_ctx)3257 int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt,
3258 mbedtls_x509_crt *trust_ca,
3259 mbedtls_x509_crl *ca_crl,
3260 const mbedtls_x509_crt_profile *profile,
3261 const char *cn, uint32_t *flags,
3262 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3263 void *p_vrfy,
3264 mbedtls_x509_crt_restart_ctx *rs_ctx )
3265 {
3266 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3267 NULL, NULL,
3268 profile, cn, flags,
3269 f_vrfy, p_vrfy, rs_ctx ) );
3270 }
3271
3272
3273 /*
3274 * Initialize a certificate chain
3275 */
mbedtls_x509_crt_init(mbedtls_x509_crt * crt)3276 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt )
3277 {
3278 memset( crt, 0, sizeof(mbedtls_x509_crt) );
3279 }
3280
3281 /*
3282 * Unallocate all certificate data
3283 */
mbedtls_x509_crt_free(mbedtls_x509_crt * crt)3284 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt )
3285 {
3286 mbedtls_x509_crt *cert_cur = crt;
3287 mbedtls_x509_crt *cert_prv;
3288
3289 while( cert_cur != NULL )
3290 {
3291 mbedtls_pk_free( &cert_cur->pk );
3292
3293 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
3294 mbedtls_free( cert_cur->sig_opts );
3295 #endif
3296
3297 mbedtls_asn1_free_named_data_list_shallow( cert_cur->issuer.next );
3298 mbedtls_asn1_free_named_data_list_shallow( cert_cur->subject.next );
3299 mbedtls_asn1_sequence_free( cert_cur->ext_key_usage.next );
3300 mbedtls_asn1_sequence_free( cert_cur->subject_alt_names.next );
3301 mbedtls_asn1_sequence_free( cert_cur->certificate_policies.next );
3302
3303 if( cert_cur->raw.p != NULL && cert_cur->own_buffer )
3304 {
3305 mbedtls_platform_zeroize( cert_cur->raw.p, cert_cur->raw.len );
3306 mbedtls_free( cert_cur->raw.p );
3307 }
3308
3309 cert_prv = cert_cur;
3310 cert_cur = cert_cur->next;
3311
3312 mbedtls_platform_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) );
3313 if( cert_prv != crt )
3314 mbedtls_free( cert_prv );
3315 }
3316 }
3317
3318 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
3319 /*
3320 * Initialize a restart context
3321 */
mbedtls_x509_crt_restart_init(mbedtls_x509_crt_restart_ctx * ctx)3322 void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx )
3323 {
3324 mbedtls_pk_restart_init( &ctx->pk );
3325
3326 ctx->parent = NULL;
3327 ctx->fallback_parent = NULL;
3328 ctx->fallback_signature_is_good = 0;
3329
3330 ctx->parent_is_trusted = -1;
3331
3332 ctx->in_progress = x509_crt_rs_none;
3333 ctx->self_cnt = 0;
3334 x509_crt_verify_chain_reset( &ctx->ver_chain );
3335 }
3336
3337 /*
3338 * Free the components of a restart context
3339 */
mbedtls_x509_crt_restart_free(mbedtls_x509_crt_restart_ctx * ctx)3340 void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx )
3341 {
3342 if( ctx == NULL )
3343 return;
3344
3345 mbedtls_pk_restart_free( &ctx->pk );
3346 mbedtls_x509_crt_restart_init( ctx );
3347 }
3348 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
3349
3350 #endif /* MBEDTLS_X509_CRT_PARSE_C */
3351
