1 /*
2 * X.509 Certidicate Revocation List (CRL) parsing
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21 /*
22 * The ITU-T X.509 standard defines a certificate format for PKI.
23 *
24 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
25 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
26 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
27 *
28 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
29 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
30 */
31
32 #if !defined(MBEDTLS_CONFIG_FILE)
33 #include "mbedtls/config.h"
34 #else
35 #include MBEDTLS_CONFIG_FILE
36 #endif
37
38 #if defined(MBEDTLS_X509_CRL_PARSE_C)
39
40 #include "mbedtls/x509_crl.h"
41 #include "mbedtls/oid.h"
42
43 #include <string.h>
44
45 #if defined(MBEDTLS_PEM_PARSE_C)
46 #include "mbedtls/pem.h"
47 #endif
48
49 #if defined(MBEDTLS_PLATFORM_C)
50 #include "mbedtls/platform.h"
51 #else
52 #include <stdlib.h>
53 #include <stdio.h>
54 #define mbedtls_free free
55 #define mbedtls_calloc calloc
56 #define mbedtls_snprintf snprintf
57 #endif
58
59 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
60 #include <windows.h>
61 #else
62 #include <time.h>
63 #endif
64
65 #if defined(MBEDTLS_FS_IO) || defined(EFIX64) || defined(EFI32)
66 #include <stdio.h>
67 #endif
68
69 /* Implementation that should never be optimized out by the compiler */
mbedtls_zeroize(void * v,size_t n)70 static void mbedtls_zeroize( void *v, size_t n ) {
71 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
72 }
73
74 /*
75 * Version ::= INTEGER { v1(0), v2(1) }
76 */
x509_crl_get_version(unsigned char ** p,const unsigned char * end,int * ver)77 static int x509_crl_get_version( unsigned char **p,
78 const unsigned char *end,
79 int *ver )
80 {
81 int ret;
82
83 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
84 {
85 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
86 {
87 *ver = 0;
88 return( 0 );
89 }
90
91 return( MBEDTLS_ERR_X509_INVALID_VERSION + ret );
92 }
93
94 return( 0 );
95 }
96
97 /*
98 * X.509 CRL v2 extensions (no extensions parsed yet.)
99 */
x509_get_crl_ext(unsigned char ** p,const unsigned char * end,mbedtls_x509_buf * ext)100 static int x509_get_crl_ext( unsigned char **p,
101 const unsigned char *end,
102 mbedtls_x509_buf *ext )
103 {
104 int ret;
105 size_t len = 0;
106
107 /* Get explicit tag */
108 if( ( ret = mbedtls_x509_get_ext( p, end, ext, 0) ) != 0 )
109 {
110 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
111 return( 0 );
112
113 return( ret );
114 }
115
116 while( *p < end )
117 {
118 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
119 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
120 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
121
122 *p += len;
123 }
124
125 if( *p != end )
126 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
127 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
128
129 return( 0 );
130 }
131
132 /*
133 * X.509 CRL v2 entry extensions (no extensions parsed yet.)
134 */
x509_get_crl_entry_ext(unsigned char ** p,const unsigned char * end,mbedtls_x509_buf * ext)135 static int x509_get_crl_entry_ext( unsigned char **p,
136 const unsigned char *end,
137 mbedtls_x509_buf *ext )
138 {
139 int ret;
140 size_t len = 0;
141
142 /* OPTIONAL */
143 if( end <= *p )
144 return( 0 );
145
146 ext->tag = **p;
147 ext->p = *p;
148
149 /*
150 * Get CRL-entry extension sequence header
151 * crlEntryExtensions Extensions OPTIONAL -- if present, MUST be v2
152 */
153 if( ( ret = mbedtls_asn1_get_tag( p, end, &ext->len,
154 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
155 {
156 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
157 {
158 ext->p = NULL;
159 return( 0 );
160 }
161 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
162 }
163
164 end = *p + ext->len;
165
166 if( end != *p + ext->len )
167 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
168 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
169
170 while( *p < end )
171 {
172 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
173 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
174 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
175
176 *p += len;
177 }
178
179 if( *p != end )
180 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
181 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
182
183 return( 0 );
184 }
185
186 /*
187 * X.509 CRL Entries
188 */
x509_get_entries(unsigned char ** p,const unsigned char * end,mbedtls_x509_crl_entry * entry)189 static int x509_get_entries( unsigned char **p,
190 const unsigned char *end,
191 mbedtls_x509_crl_entry *entry )
192 {
193 int ret;
194 size_t entry_len;
195 mbedtls_x509_crl_entry *cur_entry = entry;
196
197 if( *p == end )
198 return( 0 );
199
200 if( ( ret = mbedtls_asn1_get_tag( p, end, &entry_len,
201 MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED ) ) != 0 )
202 {
203 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
204 return( 0 );
205
206 return( ret );
207 }
208
209 end = *p + entry_len;
210
211 while( *p < end )
212 {
213 size_t len2;
214 const unsigned char *end2;
215
216 if( ( ret = mbedtls_asn1_get_tag( p, end, &len2,
217 MBEDTLS_ASN1_SEQUENCE | MBEDTLS_ASN1_CONSTRUCTED ) ) != 0 )
218 {
219 return( ret );
220 }
221
222 cur_entry->raw.tag = **p;
223 cur_entry->raw.p = *p;
224 cur_entry->raw.len = len2;
225 end2 = *p + len2;
226
227 if( ( ret = mbedtls_x509_get_serial( p, end2, &cur_entry->serial ) ) != 0 )
228 return( ret );
229
230 if( ( ret = mbedtls_x509_get_time( p, end2,
231 &cur_entry->revocation_date ) ) != 0 )
232 return( ret );
233
234 if( ( ret = x509_get_crl_entry_ext( p, end2,
235 &cur_entry->entry_ext ) ) != 0 )
236 return( ret );
237
238 if( *p < end )
239 {
240 cur_entry->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crl_entry ) );
241
242 if( cur_entry->next == NULL )
243 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
244
245 cur_entry = cur_entry->next;
246 }
247 }
248
249 return( 0 );
250 }
251
252 /*
253 * Parse one CRLs in DER format and append it to the chained list
254 */
mbedtls_x509_crl_parse_der(mbedtls_x509_crl * chain,const unsigned char * buf,size_t buflen)255 int mbedtls_x509_crl_parse_der( mbedtls_x509_crl *chain,
256 const unsigned char *buf, size_t buflen )
257 {
258 int ret;
259 size_t len;
260 unsigned char *p, *end;
261 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
262 mbedtls_x509_crl *crl = chain;
263
264 /*
265 * Check for valid input
266 */
267 if( crl == NULL || buf == NULL )
268 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
269
270 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) );
271 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) );
272 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) );
273
274 /*
275 * Add new CRL on the end of the chain if needed.
276 */
277 while( crl->version != 0 && crl->next != NULL )
278 crl = crl->next;
279
280 if( crl->version != 0 && crl->next == NULL )
281 {
282 crl->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crl ) );
283
284 if( crl->next == NULL )
285 {
286 mbedtls_x509_crl_free( crl );
287 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
288 }
289
290 mbedtls_x509_crl_init( crl->next );
291 crl = crl->next;
292 }
293
294 /*
295 * Copy raw DER-encoded CRL
296 */
297 if( ( p = mbedtls_calloc( 1, buflen ) ) == NULL )
298 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
299
300 memcpy( p, buf, buflen );
301
302 crl->raw.p = p;
303 crl->raw.len = buflen;
304
305 end = p + buflen;
306
307 /*
308 * CertificateList ::= SEQUENCE {
309 * tbsCertList TBSCertList,
310 * signatureAlgorithm AlgorithmIdentifier,
311 * signatureValue BIT STRING }
312 */
313 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
314 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
315 {
316 mbedtls_x509_crl_free( crl );
317 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
318 }
319
320 if( len != (size_t) ( end - p ) )
321 {
322 mbedtls_x509_crl_free( crl );
323 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
324 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
325 }
326
327 /*
328 * TBSCertList ::= SEQUENCE {
329 */
330 crl->tbs.p = p;
331
332 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
333 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
334 {
335 mbedtls_x509_crl_free( crl );
336 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
337 }
338
339 end = p + len;
340 crl->tbs.len = end - crl->tbs.p;
341
342 /*
343 * Version ::= INTEGER OPTIONAL { v1(0), v2(1) }
344 * -- if present, MUST be v2
345 *
346 * signature AlgorithmIdentifier
347 */
348 if( ( ret = x509_crl_get_version( &p, end, &crl->version ) ) != 0 ||
349 ( ret = mbedtls_x509_get_alg( &p, end, &crl->sig_oid, &sig_params1 ) ) != 0 )
350 {
351 mbedtls_x509_crl_free( crl );
352 return( ret );
353 }
354
355 crl->version++;
356
357 if( crl->version > 2 )
358 {
359 mbedtls_x509_crl_free( crl );
360 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
361 }
362
363 if( ( ret = mbedtls_x509_get_sig_alg( &crl->sig_oid, &sig_params1,
364 &crl->sig_md, &crl->sig_pk,
365 &crl->sig_opts ) ) != 0 )
366 {
367 mbedtls_x509_crl_free( crl );
368 return( MBEDTLS_ERR_X509_UNKNOWN_SIG_ALG );
369 }
370
371 /*
372 * issuer Name
373 */
374 crl->issuer_raw.p = p;
375
376 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
377 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
378 {
379 mbedtls_x509_crl_free( crl );
380 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
381 }
382
383 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crl->issuer ) ) != 0 )
384 {
385 mbedtls_x509_crl_free( crl );
386 return( ret );
387 }
388
389 crl->issuer_raw.len = p - crl->issuer_raw.p;
390
391 /*
392 * thisUpdate Time
393 * nextUpdate Time OPTIONAL
394 */
395 if( ( ret = mbedtls_x509_get_time( &p, end, &crl->this_update ) ) != 0 )
396 {
397 mbedtls_x509_crl_free( crl );
398 return( ret );
399 }
400
401 if( ( ret = mbedtls_x509_get_time( &p, end, &crl->next_update ) ) != 0 )
402 {
403 if( ret != ( MBEDTLS_ERR_X509_INVALID_DATE +
404 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) &&
405 ret != ( MBEDTLS_ERR_X509_INVALID_DATE +
406 MBEDTLS_ERR_ASN1_OUT_OF_DATA ) )
407 {
408 mbedtls_x509_crl_free( crl );
409 return( ret );
410 }
411 }
412
413 /*
414 * revokedCertificates SEQUENCE OF SEQUENCE {
415 * userCertificate CertificateSerialNumber,
416 * revocationDate Time,
417 * crlEntryExtensions Extensions OPTIONAL
418 * -- if present, MUST be v2
419 * } OPTIONAL
420 */
421 if( ( ret = x509_get_entries( &p, end, &crl->entry ) ) != 0 )
422 {
423 mbedtls_x509_crl_free( crl );
424 return( ret );
425 }
426
427 /*
428 * crlExtensions EXPLICIT Extensions OPTIONAL
429 * -- if present, MUST be v2
430 */
431 if( crl->version == 2 )
432 {
433 ret = x509_get_crl_ext( &p, end, &crl->crl_ext );
434
435 if( ret != 0 )
436 {
437 mbedtls_x509_crl_free( crl );
438 return( ret );
439 }
440 }
441
442 if( p != end )
443 {
444 mbedtls_x509_crl_free( crl );
445 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
446 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
447 }
448
449 end = crl->raw.p + crl->raw.len;
450
451 /*
452 * signatureAlgorithm AlgorithmIdentifier,
453 * signatureValue BIT STRING
454 */
455 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 )
456 {
457 mbedtls_x509_crl_free( crl );
458 return( ret );
459 }
460
461 if( crl->sig_oid.len != sig_oid2.len ||
462 memcmp( crl->sig_oid.p, sig_oid2.p, crl->sig_oid.len ) != 0 ||
463 sig_params1.len != sig_params2.len ||
464 ( sig_params1.len != 0 &&
465 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) )
466 {
467 mbedtls_x509_crl_free( crl );
468 return( MBEDTLS_ERR_X509_SIG_MISMATCH );
469 }
470
471 if( ( ret = mbedtls_x509_get_sig( &p, end, &crl->sig ) ) != 0 )
472 {
473 mbedtls_x509_crl_free( crl );
474 return( ret );
475 }
476
477 if( p != end )
478 {
479 mbedtls_x509_crl_free( crl );
480 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
481 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
482 }
483
484 return( 0 );
485 }
486
487 /*
488 * Parse one or more CRLs and add them to the chained list
489 */
mbedtls_x509_crl_parse(mbedtls_x509_crl * chain,const unsigned char * buf,size_t buflen)490 int mbedtls_x509_crl_parse( mbedtls_x509_crl *chain, const unsigned char *buf, size_t buflen )
491 {
492 #if defined(MBEDTLS_PEM_PARSE_C)
493 int ret;
494 size_t use_len;
495 mbedtls_pem_context pem;
496 int is_pem = 0;
497
498 if( chain == NULL || buf == NULL )
499 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
500
501 do
502 {
503 mbedtls_pem_init( &pem );
504
505 // Avoid calling mbedtls_pem_read_buffer() on non-null-terminated
506 // string
507 if( buflen == 0 || buf[buflen - 1] != '\0' )
508 ret = MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT;
509 else
510 ret = mbedtls_pem_read_buffer( &pem,
511 "-----BEGIN X509 CRL-----",
512 "-----END X509 CRL-----",
513 buf, NULL, 0, &use_len );
514
515 if( ret == 0 )
516 {
517 /*
518 * Was PEM encoded
519 */
520 is_pem = 1;
521
522 buflen -= use_len;
523 buf += use_len;
524
525 if( ( ret = mbedtls_x509_crl_parse_der( chain,
526 pem.buf, pem.buflen ) ) != 0 )
527 {
528 return( ret );
529 }
530
531 mbedtls_pem_free( &pem );
532 }
533 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
534 {
535 mbedtls_pem_free( &pem );
536 return( ret );
537 }
538 }
539 /* In the PEM case, buflen is 1 at the end, for the terminated NULL byte.
540 * And a valid CRL cannot be less than 1 byte anyway. */
541 while( is_pem && buflen > 1 );
542
543 if( is_pem )
544 return( 0 );
545 else
546 #endif /* MBEDTLS_PEM_PARSE_C */
547 return( mbedtls_x509_crl_parse_der( chain, buf, buflen ) );
548 }
549
550 #if defined(MBEDTLS_FS_IO)
551 /*
552 * Load one or more CRLs and add them to the chained list
553 */
mbedtls_x509_crl_parse_file(mbedtls_x509_crl * chain,const char * path)554 int mbedtls_x509_crl_parse_file( mbedtls_x509_crl *chain, const char *path )
555 {
556 int ret;
557 size_t n;
558 unsigned char *buf;
559
560 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
561 return( ret );
562
563 ret = mbedtls_x509_crl_parse( chain, buf, n );
564
565 mbedtls_zeroize( buf, n );
566 mbedtls_free( buf );
567
568 return( ret );
569 }
570 #endif /* MBEDTLS_FS_IO */
571
572 /*
573 * Return an informational string about the certificate.
574 */
575 #define BEFORE_COLON 14
576 #define BC "14"
577 /*
578 * Return an informational string about the CRL.
579 */
mbedtls_x509_crl_info(char * buf,size_t size,const char * prefix,const mbedtls_x509_crl * crl)580 int mbedtls_x509_crl_info( char *buf, size_t size, const char *prefix,
581 const mbedtls_x509_crl *crl )
582 {
583 int ret;
584 size_t n;
585 char *p;
586 const mbedtls_x509_crl_entry *entry;
587
588 p = buf;
589 n = size;
590
591 ret = mbedtls_snprintf( p, n, "%sCRL version : %d",
592 prefix, crl->version );
593 MBEDTLS_X509_SAFE_SNPRINTF;
594
595 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix );
596 MBEDTLS_X509_SAFE_SNPRINTF;
597 ret = mbedtls_x509_dn_gets( p, n, &crl->issuer );
598 MBEDTLS_X509_SAFE_SNPRINTF;
599
600 ret = mbedtls_snprintf( p, n, "\n%sthis update : " \
601 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
602 crl->this_update.year, crl->this_update.mon,
603 crl->this_update.day, crl->this_update.hour,
604 crl->this_update.min, crl->this_update.sec );
605 MBEDTLS_X509_SAFE_SNPRINTF;
606
607 ret = mbedtls_snprintf( p, n, "\n%snext update : " \
608 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
609 crl->next_update.year, crl->next_update.mon,
610 crl->next_update.day, crl->next_update.hour,
611 crl->next_update.min, crl->next_update.sec );
612 MBEDTLS_X509_SAFE_SNPRINTF;
613
614 entry = &crl->entry;
615
616 ret = mbedtls_snprintf( p, n, "\n%sRevoked certificates:",
617 prefix );
618 MBEDTLS_X509_SAFE_SNPRINTF;
619
620 while( entry != NULL && entry->raw.len != 0 )
621 {
622 ret = mbedtls_snprintf( p, n, "\n%sserial number: ",
623 prefix );
624 MBEDTLS_X509_SAFE_SNPRINTF;
625
626 ret = mbedtls_x509_serial_gets( p, n, &entry->serial );
627 MBEDTLS_X509_SAFE_SNPRINTF;
628
629 ret = mbedtls_snprintf( p, n, " revocation date: " \
630 "%04d-%02d-%02d %02d:%02d:%02d",
631 entry->revocation_date.year, entry->revocation_date.mon,
632 entry->revocation_date.day, entry->revocation_date.hour,
633 entry->revocation_date.min, entry->revocation_date.sec );
634 MBEDTLS_X509_SAFE_SNPRINTF;
635
636 entry = entry->next;
637 }
638
639 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
640 MBEDTLS_X509_SAFE_SNPRINTF;
641
642 ret = mbedtls_x509_sig_alg_gets( p, n, &crl->sig_oid, crl->sig_pk, crl->sig_md,
643 crl->sig_opts );
644 MBEDTLS_X509_SAFE_SNPRINTF;
645
646 ret = mbedtls_snprintf( p, n, "\n" );
647 MBEDTLS_X509_SAFE_SNPRINTF;
648
649 return( (int) ( size - n ) );
650 }
651
652 /*
653 * Initialize a CRL chain
654 */
mbedtls_x509_crl_init(mbedtls_x509_crl * crl)655 void mbedtls_x509_crl_init( mbedtls_x509_crl *crl )
656 {
657 memset( crl, 0, sizeof(mbedtls_x509_crl) );
658 }
659
660 /*
661 * Unallocate all CRL data
662 */
mbedtls_x509_crl_free(mbedtls_x509_crl * crl)663 void mbedtls_x509_crl_free( mbedtls_x509_crl *crl )
664 {
665 mbedtls_x509_crl *crl_cur = crl;
666 mbedtls_x509_crl *crl_prv;
667 mbedtls_x509_name *name_cur;
668 mbedtls_x509_name *name_prv;
669 mbedtls_x509_crl_entry *entry_cur;
670 mbedtls_x509_crl_entry *entry_prv;
671
672 if( crl == NULL )
673 return;
674
675 do
676 {
677 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
678 mbedtls_free( crl_cur->sig_opts );
679 #endif
680
681 name_cur = crl_cur->issuer.next;
682 while( name_cur != NULL )
683 {
684 name_prv = name_cur;
685 name_cur = name_cur->next;
686 mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
687 mbedtls_free( name_prv );
688 }
689
690 entry_cur = crl_cur->entry.next;
691 while( entry_cur != NULL )
692 {
693 entry_prv = entry_cur;
694 entry_cur = entry_cur->next;
695 mbedtls_zeroize( entry_prv, sizeof( mbedtls_x509_crl_entry ) );
696 mbedtls_free( entry_prv );
697 }
698
699 if( crl_cur->raw.p != NULL )
700 {
701 mbedtls_zeroize( crl_cur->raw.p, crl_cur->raw.len );
702 mbedtls_free( crl_cur->raw.p );
703 }
704
705 crl_cur = crl_cur->next;
706 }
707 while( crl_cur != NULL );
708
709 crl_cur = crl;
710 do
711 {
712 crl_prv = crl_cur;
713 crl_cur = crl_cur->next;
714
715 mbedtls_zeroize( crl_prv, sizeof( mbedtls_x509_crl ) );
716 if( crl_prv != crl )
717 mbedtls_free( crl_prv );
718 }
719 while( crl_cur != NULL );
720 }
721
722 #endif /* MBEDTLS_X509_CRL_PARSE_C */
723
