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
51
52 #if defined(MBEDTLS_PLATFORM_C)
53 #include "mbedtls/platform.h"
54 #else
55 #include <stdio.h>
56 #include <stdlib.h>
57 #define mbedtls_free free
58 #define mbedtls_calloc calloc
59 #define mbedtls_snprintf snprintf
60 #endif
61
62 #if defined(MBEDTLS_THREADING_C)
63 #include "mbedtls/threading.h"
64 #endif
65
66 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
67 #include <windows.h>
68 #else
69 #include <time.h>
70 #endif
71
72 #if defined(MBEDTLS_FS_IO)
73 #include <stdio.h>
74 #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32)
75 #include <sys/types.h>
76 #include <sys/stat.h>
77 #if defined(__MBED__)
78 #include <platform/mbed_retarget.h>
79 #else
80 #ifndef ESCP_MBDTLS_CUSTOMIZATION
81 #include <dirent.h>
82 #endif
83 #endif /* __MBED__ */
84 #endif /* !_WIN32 || EFIX64 || EFI32 */
85 #endif
86
87 /*****************************************************************************
88 * @brief 定制特性：支持证书、CRL有效期的有条件忽略。具体的条件由产品自己实现。
89 *
90 ******************************************************************************/
91 #if defined(VENDOR_CUSTOMISE_CHECK_CERT_DATE_C)
92
93 /*****************************************************************************
94 * @brief 定制特性，有条件忽略证书有效期，产品注册回调函数校验。
95 *
96 ******************************************************************************/
97 hw_mbedtls_cert_date_checker g_mbedtls_customize_cert_date_checker = NULL;
98
99 /*****************************************************************************
100 * @brief 定制特性，有条件忽略CRL有效期，产品注册回调函数校验。
101 *
102 ******************************************************************************/
103 hw_mbedtls_crl_date_checker g_mbedtls_customize_crl_date_checker = NULL;
104
105 /*****************************************************************************
106 * @brief
107 *
108 * @param checker
109 * @return int
110 ******************************************************************************/
hw_mbedtls_regist_cert_date_chcker(hw_mbedtls_cert_date_checker checker)111 int hw_mbedtls_regist_cert_date_chcker(hw_mbedtls_cert_date_checker checker)
112 {
113 g_mbedtls_customize_cert_date_checker = checker;
114 return 0;
115 }
116
117 /*****************************************************************************
118 * \brief
119 *
120 * \param checker
121 * \return int
122 ******************************************************************************/
hw_mbedtls_regist_crl_date_chcker(hw_mbedtls_crl_date_checker checker)123 int hw_mbedtls_regist_crl_date_chcker(hw_mbedtls_crl_date_checker checker)
124 {
125 g_mbedtls_customize_crl_date_checker = checker;
126 return 0;
127 }
128 #endif
129
130 /*
131 * Item in a verification chain: cert and flags for it
132 */
133 typedef struct {
134 mbedtls_x509_crt *crt;
135 uint32_t flags;
136 } x509_crt_verify_chain_item;
137
138 /*
139 * Max size of verification chain: end-entity + intermediates + trusted root
140 */
141 #define X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 )
142
143 /* Default profile. Do not remove items unless there are serious security
144 * concerns. */
145 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default =
146 {
147 /* Hashes from SHA-256 and above. Note that this selection
148 * should be aligned with ssl_preset_default_hashes in ssl_tls.c. */
149 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
150 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
151 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
152 0xFFFFFFF, /* Any PK alg */
153 #if defined(MBEDTLS_ECP_C)
154 /* Curves at or above 128-bit security level. Note that this selection
155 * should be aligned with ssl_preset_default_curves in ssl_tls.c. */
156 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
157 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
158 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |
159 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
160 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
161 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
162 0,
163 #else
164 0,
165 #endif
166 2048,
167 };
168
169 /* Next-generation profile. Currently identical to the default, but may
170 * be tightened at any time. */
171 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next =
172 {
173 /* Hashes from SHA-256 and above. */
174 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
175 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
176 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
177 0xFFFFFFF, /* Any PK alg */
178 #if defined(MBEDTLS_ECP_C)
179 /* Curves at or above 128-bit security level. */
180 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
181 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
182 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |
183 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
184 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
185 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
186 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ),
187 #else
188 0,
189 #endif
190 2048,
191 };
192
193 /*
194 * NSA Suite B Profile
195 */
196 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb =
197 {
198 /* Only SHA-256 and 384 */
199 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
200 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ),
201 /* Only ECDSA */
202 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ) |
203 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECKEY ),
204 #if defined(MBEDTLS_ECP_C)
205 /* Only NIST P-256 and P-384 */
206 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
207 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ),
208 #else
209 0,
210 #endif
211 0,
212 };
213
214 /*
215 * Empty / all-forbidden profile
216 */
217 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_none =
218 {
219 0,
220 0,
221 0,
222 (uint32_t) -1,
223 };
224
225 /*
226 * Check md_alg against profile
227 * Return 0 if md_alg is acceptable for this profile, -1 otherwise
228 */
x509_profile_check_md_alg(const mbedtls_x509_crt_profile * profile,mbedtls_md_type_t md_alg)229 static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile,
230 mbedtls_md_type_t md_alg )
231 {
232 if( md_alg == MBEDTLS_MD_NONE )
233 return( -1 );
234
235 if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 )
236 return( 0 );
237
238 return( -1 );
239 }
240
241 /*
242 * Check pk_alg against profile
243 * Return 0 if pk_alg is acceptable for this profile, -1 otherwise
244 */
x509_profile_check_pk_alg(const mbedtls_x509_crt_profile * profile,mbedtls_pk_type_t pk_alg)245 static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile,
246 mbedtls_pk_type_t pk_alg )
247 {
248 if( pk_alg == MBEDTLS_PK_NONE )
249 return( -1 );
250
251 if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 )
252 return( 0 );
253
254 return( -1 );
255 }
256
257 /*
258 * Check key against profile
259 * Return 0 if pk is acceptable for this profile, -1 otherwise
260 */
x509_profile_check_key(const mbedtls_x509_crt_profile * profile,const mbedtls_pk_context * pk)261 static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile,
262 const mbedtls_pk_context *pk )
263 {
264 const mbedtls_pk_type_t pk_alg = mbedtls_pk_get_type( pk );
265
266 #if defined(MBEDTLS_RSA_C)
267 if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS )
268 {
269 if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen )
270 return( 0 );
271
272 return( -1 );
273 }
274 #endif
275
276 #if defined(MBEDTLS_ECP_C)
277 if( pk_alg == MBEDTLS_PK_ECDSA ||
278 pk_alg == MBEDTLS_PK_ECKEY ||
279 pk_alg == MBEDTLS_PK_ECKEY_DH )
280 {
281 const mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id;
282
283 if( gid == MBEDTLS_ECP_DP_NONE )
284 return( -1 );
285
286 if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 )
287 return( 0 );
288
289 return( -1 );
290 }
291 #endif
292
293 return( -1 );
294 }
295
296 /*
297 * Like memcmp, but case-insensitive and always returns -1 if different
298 */
x509_memcasecmp(const void * s1,const void * s2,size_t len)299 static int x509_memcasecmp( const void *s1, const void *s2, size_t len )
300 {
301 size_t i;
302 unsigned char diff;
303 const unsigned char *n1 = s1, *n2 = s2;
304
305 for( i = 0; i < len; i++ )
306 {
307 diff = n1[i] ^ n2[i];
308
309 if( diff == 0 )
310 continue;
311
312 if( diff == 32 &&
313 ( ( n1[i] >= 'a' && n1[i] <= 'z' ) ||
314 ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) )
315 {
316 continue;
317 }
318
319 return( -1 );
320 }
321
322 return( 0 );
323 }
324
325 /*
326 * Return 0 if name matches wildcard, -1 otherwise
327 */
x509_check_wildcard(const char * cn,const mbedtls_x509_buf * name)328 static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name )
329 {
330 size_t i;
331 size_t cn_idx = 0, cn_len = strlen( cn );
332
333 /* We can't have a match if there is no wildcard to match */
334 if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' )
335 return( -1 );
336
337 for( i = 0; i < cn_len; ++i )
338 {
339 if( cn[i] == '.' )
340 {
341 cn_idx = i;
342 break;
343 }
344 }
345
346 if( cn_idx == 0 )
347 return( -1 );
348
349 if( cn_len - cn_idx == name->len - 1 &&
350 x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
351 {
352 return( 0 );
353 }
354
355 return( -1 );
356 }
357
358 /*
359 * Compare two X.509 strings, case-insensitive, and allowing for some encoding
360 * variations (but not all).
361 *
362 * Return 0 if equal, -1 otherwise.
363 */
x509_string_cmp(const mbedtls_x509_buf * a,const mbedtls_x509_buf * b)364 static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b )
365 {
366 if( a->tag == b->tag &&
367 a->len == b->len &&
368 memcmp( a->p, b->p, b->len ) == 0 )
369 {
370 return( 0 );
371 }
372
373 if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
374 ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
375 a->len == b->len &&
376 x509_memcasecmp( a->p, b->p, b->len ) == 0 )
377 {
378 return( 0 );
379 }
380
381 return( -1 );
382 }
383
384 /*
385 * Compare two X.509 Names (aka rdnSequence).
386 *
387 * See RFC 5280 section 7.1, though we don't implement the whole algorithm:
388 * we sometimes return unequal when the full algorithm would return equal,
389 * but never the other way. (In particular, we don't do Unicode normalisation
390 * or space folding.)
391 *
392 * Return 0 if equal, -1 otherwise.
393 */
x509_name_cmp(const mbedtls_x509_name * a,const mbedtls_x509_name * b)394 static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b )
395 {
396 /* Avoid recursion, it might not be optimised by the compiler */
397 while( a != NULL || b != NULL )
398 {
399 if( a == NULL || b == NULL )
400 return( -1 );
401
402 /* type */
403 if( a->oid.tag != b->oid.tag ||
404 a->oid.len != b->oid.len ||
405 memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 )
406 {
407 return( -1 );
408 }
409
410 /* value */
411 if( x509_string_cmp( &a->val, &b->val ) != 0 )
412 return( -1 );
413
414 /* structure of the list of sets */
415 if( a->next_merged != b->next_merged )
416 return( -1 );
417
418 a = a->next;
419 b = b->next;
420 }
421
422 /* a == NULL == b */
423 return( 0 );
424 }
425
426 /*
427 * Reset (init or clear) a verify_chain
428 */
x509_crt_verify_chain_reset(mbedtls_x509_crt_verify_chain * ver_chain)429 static void x509_crt_verify_chain_reset(
430 mbedtls_x509_crt_verify_chain *ver_chain )
431 {
432 size_t i;
433
434 for( i = 0; i < MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE; i++ )
435 {
436 ver_chain->items[i].crt = NULL;
437 ver_chain->items[i].flags = (uint32_t) -1;
438 }
439
440 ver_chain->len = 0;
441
442 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
443 ver_chain->trust_ca_cb_result = NULL;
444 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
445 }
446
447 /*
448 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
449 */
x509_get_version(unsigned char ** p,const unsigned char * end,int * ver)450 static int x509_get_version( unsigned char **p,
451 const unsigned char *end,
452 int *ver )
453 {
454 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
455 size_t len;
456
457 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
458 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 )
459 {
460 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
461 {
462 *ver = 0;
463 return( 0 );
464 }
465
466 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
467 }
468
469 end = *p + len;
470
471 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
472 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION, ret ) );
473
474 if( *p != end )
475 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION,
476 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
477
478 return( 0 );
479 }
480
481 /*
482 * Validity ::= SEQUENCE {
483 * notBefore Time,
484 * notAfter Time }
485 */
x509_get_dates(unsigned char ** p,const unsigned char * end,mbedtls_x509_time * from,mbedtls_x509_time * to)486 static int x509_get_dates( unsigned char **p,
487 const unsigned char *end,
488 mbedtls_x509_time *from,
489 mbedtls_x509_time *to )
490 {
491 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
492 size_t len;
493
494 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
495 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
496 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE, ret ) );
497
498 end = *p + len;
499
500 if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 )
501 return( ret );
502
503 if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 )
504 return( ret );
505
506 if( *p != end )
507 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE,
508 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
509
510 return( 0 );
511 }
512
513 /*
514 * X.509 v2/v3 unique identifier (not parsed)
515 */
x509_get_uid(unsigned char ** p,const unsigned char * end,mbedtls_x509_buf * uid,int n)516 static int x509_get_uid( unsigned char **p,
517 const unsigned char *end,
518 mbedtls_x509_buf *uid, int n )
519 {
520 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
521
522 if( *p == end )
523 return( 0 );
524
525 uid->tag = **p;
526
527 if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len,
528 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 )
529 {
530 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
531 return( 0 );
532
533 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
534 }
535
536 uid->p = *p;
537 *p += uid->len;
538
539 return( 0 );
540 }
541
x509_get_basic_constraints(unsigned char ** p,const unsigned char * end,int * ca_istrue,int * max_pathlen)542 static int x509_get_basic_constraints( unsigned char **p,
543 const unsigned char *end,
544 int *ca_istrue,
545 int *max_pathlen )
546 {
547 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
548 size_t len;
549
550 /*
551 * BasicConstraints ::= SEQUENCE {
552 * cA BOOLEAN DEFAULT FALSE,
553 * pathLenConstraint INTEGER (0..MAX) OPTIONAL }
554 */
555 *ca_istrue = 0; /* DEFAULT FALSE */
556 *max_pathlen = 0; /* endless */
557
558 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
559 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
560 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
561
562 if( *p == end )
563 return( 0 );
564
565 if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 )
566 {
567 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
568 ret = mbedtls_asn1_get_int( p, end, ca_istrue );
569
570 if( ret != 0 )
571 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
572
573 if( *ca_istrue != 0 )
574 *ca_istrue = 1;
575 }
576
577 if( *p == end )
578 return( 0 );
579
580 if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 )
581 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
582
583 if( *p != end )
584 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
585 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
586
587 /* Do not accept max_pathlen equal to INT_MAX to avoid a signed integer
588 * overflow, which is an undefined behavior. */
589 if( *max_pathlen == INT_MAX )
590 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
591 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
592
593 (*max_pathlen)++;
594
595 return( 0 );
596 }
597
x509_get_ns_cert_type(unsigned char ** p,const unsigned char * end,unsigned char * ns_cert_type)598 static int x509_get_ns_cert_type( unsigned char **p,
599 const unsigned char *end,
600 unsigned char *ns_cert_type)
601 {
602 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
603 mbedtls_x509_bitstring bs = { 0, 0, NULL };
604
605 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
606 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
607
608 if( bs.len != 1 )
609 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
610 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
611
612 /* Get actual bitstring */
613 *ns_cert_type = *bs.p;
614 return( 0 );
615 }
616
x509_get_key_usage(unsigned char ** p,const unsigned char * end,unsigned int * key_usage)617 static int x509_get_key_usage( unsigned char **p,
618 const unsigned char *end,
619 unsigned int *key_usage)
620 {
621 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
622 size_t i;
623 mbedtls_x509_bitstring bs = { 0, 0, NULL };
624
625 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
626 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
627
628 if( bs.len < 1 )
629 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
630 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
631
632 /* Get actual bitstring */
633 *key_usage = 0;
634 for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ )
635 {
636 *key_usage |= (unsigned int) bs.p[i] << (8*i);
637 }
638
639 return( 0 );
640 }
641
642 /*
643 * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
644 *
645 * KeyPurposeId ::= OBJECT IDENTIFIER
646 */
x509_get_ext_key_usage(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * ext_key_usage)647 static int x509_get_ext_key_usage( unsigned char **p,
648 const unsigned char *end,
649 mbedtls_x509_sequence *ext_key_usage)
650 {
651 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
652
653 if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 )
654 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
655
656 /* Sequence length must be >= 1 */
657 if( ext_key_usage->buf.p == NULL )
658 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
659 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
660
661 return( 0 );
662 }
663
664 /*
665 * SubjectAltName ::= GeneralNames
666 *
667 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
668 *
669 * GeneralName ::= CHOICE {
670 * otherName [0] OtherName,
671 * rfc822Name [1] IA5String,
672 * dNSName [2] IA5String,
673 * x400Address [3] ORAddress,
674 * directoryName [4] Name,
675 * ediPartyName [5] EDIPartyName,
676 * uniformResourceIdentifier [6] IA5String,
677 * iPAddress [7] OCTET STRING,
678 * registeredID [8] OBJECT IDENTIFIER }
679 *
680 * OtherName ::= SEQUENCE {
681 * type-id OBJECT IDENTIFIER,
682 * value [0] EXPLICIT ANY DEFINED BY type-id }
683 *
684 * EDIPartyName ::= SEQUENCE {
685 * nameAssigner [0] DirectoryString OPTIONAL,
686 * partyName [1] DirectoryString }
687 *
688 * NOTE: we list all types, but only use dNSName and otherName
689 * of type HwModuleName, as defined in RFC 4108, at this point.
690 */
x509_get_subject_alt_name(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * subject_alt_name)691 static int x509_get_subject_alt_name( unsigned char **p,
692 const unsigned char *end,
693 mbedtls_x509_sequence *subject_alt_name )
694 {
695 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
696 size_t len, tag_len;
697 mbedtls_asn1_buf *buf;
698 unsigned char tag;
699 mbedtls_asn1_sequence *cur = subject_alt_name;
700
701 /* Get main sequence tag */
702 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
703 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
704 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
705
706 if( *p + len != end )
707 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
708 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
709
710 while( *p < end )
711 {
712 mbedtls_x509_subject_alternative_name dummy_san_buf;
713 memset( &dummy_san_buf, 0, sizeof( dummy_san_buf ) );
714
715 tag = **p;
716 (*p)++;
717 if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 )
718 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
719
720 if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) !=
721 MBEDTLS_ASN1_CONTEXT_SPECIFIC )
722 {
723 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
724 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) );
725 }
726
727 /*
728 * Check that the SAN is structured correctly.
729 */
730 ret = mbedtls_x509_parse_subject_alt_name( &(cur->buf), &dummy_san_buf );
731 /*
732 * In case the extension is malformed, return an error,
733 * and clear the allocated sequences.
734 */
735 if( ret != 0 && ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
736 {
737 mbedtls_x509_sequence *seq_cur = subject_alt_name->next;
738 mbedtls_x509_sequence *seq_prv;
739 while( seq_cur != NULL )
740 {
741 seq_prv = seq_cur;
742 seq_cur = seq_cur->next;
743 mbedtls_platform_zeroize( seq_prv,
744 sizeof( mbedtls_x509_sequence ) );
745 mbedtls_free( seq_prv );
746 }
747 subject_alt_name->next = NULL;
748 return( ret );
749 }
750
751 /* Allocate and assign next pointer */
752 if( cur->buf.p != NULL )
753 {
754 if( cur->next != NULL )
755 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
756
757 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
758
759 if( cur->next == NULL )
760 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
761 MBEDTLS_ERR_ASN1_ALLOC_FAILED ) );
762
763 cur = cur->next;
764 }
765
766 buf = &(cur->buf);
767 buf->tag = tag;
768 buf->p = *p;
769 buf->len = tag_len;
770 *p += buf->len;
771 }
772
773 /* Set final sequence entry's next pointer to NULL */
774 cur->next = NULL;
775
776 if( *p != end )
777 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
778 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
779
780 return( 0 );
781 }
782
783 /*
784 * id-ce-certificatePolicies OBJECT IDENTIFIER ::= { id-ce 32 }
785 *
786 * anyPolicy OBJECT IDENTIFIER ::= { id-ce-certificatePolicies 0 }
787 *
788 * certificatePolicies ::= SEQUENCE SIZE (1..MAX) OF PolicyInformation
789 *
790 * PolicyInformation ::= SEQUENCE {
791 * policyIdentifier CertPolicyId,
792 * policyQualifiers SEQUENCE SIZE (1..MAX) OF
793 * PolicyQualifierInfo OPTIONAL }
794 *
795 * CertPolicyId ::= OBJECT IDENTIFIER
796 *
797 * PolicyQualifierInfo ::= SEQUENCE {
798 * policyQualifierId PolicyQualifierId,
799 * qualifier ANY DEFINED BY policyQualifierId }
800 *
801 * -- policyQualifierIds for Internet policy qualifiers
802 *
803 * id-qt OBJECT IDENTIFIER ::= { id-pkix 2 }
804 * id-qt-cps OBJECT IDENTIFIER ::= { id-qt 1 }
805 * id-qt-unotice OBJECT IDENTIFIER ::= { id-qt 2 }
806 *
807 * PolicyQualifierId ::= OBJECT IDENTIFIER ( id-qt-cps | id-qt-unotice )
808 *
809 * Qualifier ::= CHOICE {
810 * cPSuri CPSuri,
811 * userNotice UserNotice }
812 *
813 * CPSuri ::= IA5String
814 *
815 * UserNotice ::= SEQUENCE {
816 * noticeRef NoticeReference OPTIONAL,
817 * explicitText DisplayText OPTIONAL }
818 *
819 * NoticeReference ::= SEQUENCE {
820 * organization DisplayText,
821 * noticeNumbers SEQUENCE OF INTEGER }
822 *
823 * DisplayText ::= CHOICE {
824 * ia5String IA5String (SIZE (1..200)),
825 * visibleString VisibleString (SIZE (1..200)),
826 * bmpString BMPString (SIZE (1..200)),
827 * utf8String UTF8String (SIZE (1..200)) }
828 *
829 * NOTE: we only parse and use anyPolicy without qualifiers at this point
830 * as defined in RFC 5280.
831 */
x509_get_certificate_policies(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * certificate_policies)832 static int x509_get_certificate_policies( unsigned char **p,
833 const unsigned char *end,
834 mbedtls_x509_sequence *certificate_policies )
835 {
836 int ret, parse_ret = 0;
837 size_t len;
838 mbedtls_asn1_buf *buf;
839 mbedtls_asn1_sequence *cur = certificate_policies;
840
841 /* Get main sequence tag */
842 ret = mbedtls_asn1_get_tag( p, end, &len,
843 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE );
844 if( ret != 0 )
845 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
846
847 if( *p + len != end )
848 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
849 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
850
851 /*
852 * Cannot be an empty sequence.
853 */
854 if( len == 0 )
855 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
856 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
857
858 while( *p < end )
859 {
860 mbedtls_x509_buf policy_oid;
861 const unsigned char *policy_end;
862
863 /*
864 * Get the policy sequence
865 */
866 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
867 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
868 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
869
870 policy_end = *p + len;
871
872 if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
873 MBEDTLS_ASN1_OID ) ) != 0 )
874 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
875
876 policy_oid.tag = MBEDTLS_ASN1_OID;
877 policy_oid.len = len;
878 policy_oid.p = *p;
879
880 /*
881 * Only AnyPolicy is currently supported when enforcing policy.
882 */
883 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_POLICY, &policy_oid ) != 0 )
884 {
885 /*
886 * Set the parsing return code but continue parsing, in case this
887 * extension is critical.
888 */
889 parse_ret = MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
890 }
891
892 /* Allocate and assign next pointer */
893 if( cur->buf.p != NULL )
894 {
895 if( cur->next != NULL )
896 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
897
898 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
899
900 if( cur->next == NULL )
901 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
902 MBEDTLS_ERR_ASN1_ALLOC_FAILED ) );
903
904 cur = cur->next;
905 }
906
907 buf = &( cur->buf );
908 buf->tag = policy_oid.tag;
909 buf->p = policy_oid.p;
910 buf->len = policy_oid.len;
911
912 *p += len;
913
914 /*
915 * If there is an optional qualifier, then *p < policy_end
916 * Check the Qualifier len to verify it doesn't exceed policy_end.
917 */
918 if( *p < policy_end )
919 {
920 if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
921 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
922 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
923 /*
924 * Skip the optional policy qualifiers.
925 */
926 *p += len;
927 }
928
929 if( *p != policy_end )
930 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
931 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
932 }
933
934 /* Set final sequence entry's next pointer to NULL */
935 cur->next = NULL;
936
937 if( *p != end )
938 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
939 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
940
941 return( parse_ret );
942 }
943
944 /*
945 * X.509 v3 extensions
946 *
947 */
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)948 static int x509_get_crt_ext( unsigned char **p,
949 const unsigned char *end,
950 mbedtls_x509_crt *crt,
951 mbedtls_x509_crt_ext_cb_t cb,
952 void *p_ctx )
953 {
954 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
955 size_t len;
956 unsigned char *end_ext_data, *start_ext_octet, *end_ext_octet;
957
958 if( *p == end )
959 return( 0 );
960
961 if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 )
962 return( ret );
963
964 end = crt->v3_ext.p + crt->v3_ext.len;
965 while( *p < end )
966 {
967 /*
968 * Extension ::= SEQUENCE {
969 * extnID OBJECT IDENTIFIER,
970 * critical BOOLEAN DEFAULT FALSE,
971 * extnValue OCTET STRING }
972 */
973 mbedtls_x509_buf extn_oid = {0, 0, NULL};
974 int is_critical = 0; /* DEFAULT FALSE */
975 int ext_type = 0;
976
977 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
978 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
979 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
980
981 end_ext_data = *p + len;
982
983 /* Get extension ID */
984 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len,
985 MBEDTLS_ASN1_OID ) ) != 0 )
986 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
987
988 extn_oid.tag = MBEDTLS_ASN1_OID;
989 extn_oid.p = *p;
990 *p += extn_oid.len;
991
992 /* Get optional critical */
993 if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
994 ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )
995 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
996
997 /* Data should be octet string type */
998 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len,
999 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
1000 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1001
1002 start_ext_octet = *p;
1003 end_ext_octet = *p + len;
1004
1005 if( end_ext_octet != end_ext_data )
1006 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1007 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1008
1009 /*
1010 * Detect supported extensions
1011 */
1012 ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type );
1013
1014 if( ret != 0 )
1015 {
1016 /* Give the callback (if any) a chance to handle the extension */
1017 if( cb != NULL )
1018 {
1019 ret = cb( p_ctx, crt, &extn_oid, is_critical, *p, end_ext_octet );
1020 if( ret != 0 && is_critical )
1021 return( ret );
1022 *p = end_ext_octet;
1023 continue;
1024 }
1025
1026 /* No parser found, skip extension */
1027 *p = end_ext_octet;
1028
1029 if( is_critical )
1030 {
1031 /* Data is marked as critical: fail */
1032 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1033 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) );
1034 }
1035 continue;
1036 }
1037
1038 /* Forbid repeated extensions */
1039 if( ( crt->ext_types & ext_type ) != 0 )
1040 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
1041
1042 crt->ext_types |= ext_type;
1043
1044 switch( ext_type )
1045 {
1046 case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS:
1047 /* Parse basic constraints */
1048 if( ( ret = x509_get_basic_constraints( p, end_ext_octet,
1049 &crt->ca_istrue, &crt->max_pathlen ) ) != 0 )
1050 return( ret );
1051 break;
1052
1053 case MBEDTLS_X509_EXT_KEY_USAGE:
1054 /* Parse key usage */
1055 if( ( ret = x509_get_key_usage( p, end_ext_octet,
1056 &crt->key_usage ) ) != 0 )
1057 return( ret );
1058 break;
1059
1060 case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE:
1061 /* Parse extended key usage */
1062 if( ( ret = x509_get_ext_key_usage( p, end_ext_octet,
1063 &crt->ext_key_usage ) ) != 0 )
1064 return( ret );
1065 break;
1066
1067 case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
1068 /* Parse subject alt name */
1069 if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
1070 &crt->subject_alt_names ) ) != 0 )
1071 return( ret );
1072 break;
1073
1074 case MBEDTLS_X509_EXT_NS_CERT_TYPE:
1075 /* Parse netscape certificate type */
1076 if( ( ret = x509_get_ns_cert_type( p, end_ext_octet,
1077 &crt->ns_cert_type ) ) != 0 )
1078 return( ret );
1079 break;
1080
1081 case MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES:
1082 /* Parse certificate policies type */
1083 if( ( ret = x509_get_certificate_policies( p, end_ext_octet,
1084 &crt->certificate_policies ) ) != 0 )
1085 {
1086 /* Give the callback (if any) a chance to handle the extension
1087 * if it contains unsupported policies */
1088 if( ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE && cb != NULL &&
1089 cb( p_ctx, crt, &extn_oid, is_critical,
1090 start_ext_octet, end_ext_octet ) == 0 )
1091 break;
1092
1093 if( is_critical )
1094 return( ret );
1095 else
1096 /*
1097 * If MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE is returned, then we
1098 * cannot interpret or enforce the policy. However, it is up to
1099 * the user to choose how to enforce the policies,
1100 * unless the extension is critical.
1101 */
1102 if( ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
1103 return( ret );
1104 }
1105 break;
1106
1107 default:
1108 /*
1109 * If this is a non-critical extension, which the oid layer
1110 * supports, but there isn't an x509 parser for it,
1111 * skip the extension.
1112 */
1113 if( is_critical )
1114 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1115 else
1116 *p = end_ext_octet;
1117 }
1118 }
1119
1120 if( *p != end )
1121 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1122 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1123
1124 return( 0 );
1125 }
1126
1127 /*
1128 * Parse and fill a single X.509 certificate in DER format
1129 */
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)1130 static int x509_crt_parse_der_core( mbedtls_x509_crt *crt,
1131 const unsigned char *buf,
1132 size_t buflen,
1133 int make_copy,
1134 mbedtls_x509_crt_ext_cb_t cb,
1135 void *p_ctx )
1136 {
1137 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1138 size_t len;
1139 unsigned char *p, *end, *crt_end;
1140 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
1141
1142 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) );
1143 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) );
1144 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) );
1145
1146 /*
1147 * Check for valid input
1148 */
1149 if( crt == NULL || buf == NULL )
1150 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1151
1152 /* Use the original buffer until we figure out actual length. */
1153 p = (unsigned char*) buf;
1154 len = buflen;
1155 end = p + len;
1156
1157 /*
1158 * Certificate ::= SEQUENCE {
1159 * tbsCertificate TBSCertificate,
1160 * signatureAlgorithm AlgorithmIdentifier,
1161 * signatureValue BIT STRING }
1162 */
1163 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1164 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1165 {
1166 mbedtls_x509_crt_free( crt );
1167 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
1168 }
1169
1170 end = crt_end = p + len;
1171 crt->raw.len = crt_end - buf;
1172 if( make_copy != 0 )
1173 {
1174 /* Create and populate a new buffer for the raw field. */
1175 crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len );
1176 if( crt->raw.p == NULL )
1177 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
1178
1179 memcpy( crt->raw.p, buf, crt->raw.len );
1180 crt->own_buffer = 1;
1181
1182 p += crt->raw.len - len;
1183 end = crt_end = p + len;
1184 }
1185 else
1186 {
1187 crt->raw.p = (unsigned char*) buf;
1188 crt->own_buffer = 0;
1189 }
1190
1191 /*
1192 * TBSCertificate ::= SEQUENCE {
1193 */
1194 crt->tbs.p = p;
1195
1196 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1197 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1198 {
1199 mbedtls_x509_crt_free( crt );
1200 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1201 }
1202
1203 end = p + len;
1204 crt->tbs.len = end - crt->tbs.p;
1205
1206 /*
1207 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
1208 *
1209 * CertificateSerialNumber ::= INTEGER
1210 *
1211 * signature AlgorithmIdentifier
1212 */
1213 if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 ||
1214 ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 ||
1215 ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid,
1216 &sig_params1 ) ) != 0 )
1217 {
1218 mbedtls_x509_crt_free( crt );
1219 return( ret );
1220 }
1221
1222 if( crt->version < 0 || crt->version > 2 )
1223 {
1224 mbedtls_x509_crt_free( crt );
1225 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
1226 }
1227
1228 crt->version++;
1229
1230 if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1,
1231 &crt->sig_md, &crt->sig_pk,
1232 &crt->sig_opts ) ) != 0 )
1233 {
1234 mbedtls_x509_crt_free( crt );
1235 return( ret );
1236 }
1237
1238 /*
1239 * issuer Name
1240 */
1241 crt->issuer_raw.p = p;
1242
1243 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1244 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1245 {
1246 mbedtls_x509_crt_free( crt );
1247 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1248 }
1249
1250 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 )
1251 {
1252 mbedtls_x509_crt_free( crt );
1253 return( ret );
1254 }
1255
1256 crt->issuer_raw.len = p - crt->issuer_raw.p;
1257
1258 /*
1259 * Validity ::= SEQUENCE {
1260 * notBefore Time,
1261 * notAfter Time }
1262 *
1263 */
1264 if( ( ret = x509_get_dates( &p, end, &crt->valid_from,
1265 &crt->valid_to ) ) != 0 )
1266 {
1267 mbedtls_x509_crt_free( crt );
1268 return( ret );
1269 }
1270
1271 /*
1272 * subject Name
1273 */
1274 crt->subject_raw.p = p;
1275
1276 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1277 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1278 {
1279 mbedtls_x509_crt_free( crt );
1280 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1281 }
1282
1283 if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 )
1284 {
1285 mbedtls_x509_crt_free( crt );
1286 return( ret );
1287 }
1288
1289 crt->subject_raw.len = p - crt->subject_raw.p;
1290
1291 /*
1292 * SubjectPublicKeyInfo
1293 */
1294 crt->pk_raw.p = p;
1295 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 )
1296 {
1297 mbedtls_x509_crt_free( crt );
1298 return( ret );
1299 }
1300 crt->pk_raw.len = p - crt->pk_raw.p;
1301
1302 /*
1303 * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
1304 * -- If present, version shall be v2 or v3
1305 * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
1306 * -- If present, version shall be v2 or v3
1307 * extensions [3] EXPLICIT Extensions OPTIONAL
1308 * -- If present, version shall be v3
1309 */
1310 if( crt->version == 2 || crt->version == 3 )
1311 {
1312 ret = x509_get_uid( &p, end, &crt->issuer_id, 1 );
1313 if( ret != 0 )
1314 {
1315 mbedtls_x509_crt_free( crt );
1316 return( ret );
1317 }
1318 }
1319
1320 if( crt->version == 2 || crt->version == 3 )
1321 {
1322 ret = x509_get_uid( &p, end, &crt->subject_id, 2 );
1323 if( ret != 0 )
1324 {
1325 mbedtls_x509_crt_free( crt );
1326 return( ret );
1327 }
1328 }
1329
1330 if( crt->version == 3 )
1331 {
1332 ret = x509_get_crt_ext( &p, end, crt, cb, p_ctx );
1333 if( ret != 0 )
1334 {
1335 mbedtls_x509_crt_free( crt );
1336 return( ret );
1337 }
1338 }
1339
1340 if( p != end )
1341 {
1342 mbedtls_x509_crt_free( crt );
1343 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT,
1344 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1345 }
1346
1347 end = crt_end;
1348
1349 /*
1350 * }
1351 * -- end of TBSCertificate
1352 *
1353 * signatureAlgorithm AlgorithmIdentifier,
1354 * signatureValue BIT STRING
1355 */
1356 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 )
1357 {
1358 mbedtls_x509_crt_free( crt );
1359 return( ret );
1360 }
1361
1362 if( crt->sig_oid.len != sig_oid2.len ||
1363 memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 ||
1364 sig_params1.tag != sig_params2.tag ||
1365 sig_params1.len != sig_params2.len ||
1366 ( sig_params1.len != 0 &&
1367 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) )
1368 {
1369 mbedtls_x509_crt_free( crt );
1370 return( MBEDTLS_ERR_X509_SIG_MISMATCH );
1371 }
1372
1373 if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 )
1374 {
1375 mbedtls_x509_crt_free( crt );
1376 return( ret );
1377 }
1378
1379 if( p != end )
1380 {
1381 mbedtls_x509_crt_free( crt );
1382 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT,
1383 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1384 }
1385
1386 return( 0 );
1387 }
1388
1389 /*
1390 * Parse one X.509 certificate in DER format from a buffer and add them to a
1391 * chained list
1392 */
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)1393 static int mbedtls_x509_crt_parse_der_internal( mbedtls_x509_crt *chain,
1394 const unsigned char *buf,
1395 size_t buflen,
1396 int make_copy,
1397 mbedtls_x509_crt_ext_cb_t cb,
1398 void *p_ctx )
1399 {
1400 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1401 mbedtls_x509_crt *crt = chain, *prev = NULL;
1402
1403 /*
1404 * Check for valid input
1405 */
1406 if( crt == NULL || buf == NULL )
1407 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1408
1409 while( crt->version != 0 && crt->next != NULL )
1410 {
1411 prev = crt;
1412 crt = crt->next;
1413 }
1414
1415 /*
1416 * Add new certificate on the end of the chain if needed.
1417 */
1418 if( crt->version != 0 && crt->next == NULL )
1419 {
1420 crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
1421
1422 if( crt->next == NULL )
1423 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
1424
1425 prev = crt;
1426 mbedtls_x509_crt_init( crt->next );
1427 crt = crt->next;
1428 }
1429
1430 ret = x509_crt_parse_der_core( crt, buf, buflen, make_copy, cb, p_ctx );
1431 if( ret != 0 )
1432 {
1433 if( prev )
1434 prev->next = NULL;
1435
1436 if( crt != chain )
1437 mbedtls_free( crt );
1438
1439 return( ret );
1440 }
1441
1442 return( 0 );
1443 }
1444
mbedtls_x509_crt_parse_der_nocopy(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1445 int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
1446 const unsigned char *buf,
1447 size_t buflen )
1448 {
1449 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 0, NULL, NULL ) );
1450 }
1451
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)1452 int mbedtls_x509_crt_parse_der_with_ext_cb( mbedtls_x509_crt *chain,
1453 const unsigned char *buf,
1454 size_t buflen,
1455 int make_copy,
1456 mbedtls_x509_crt_ext_cb_t cb,
1457 void *p_ctx )
1458 {
1459 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, make_copy, cb, p_ctx ) );
1460 }
1461
mbedtls_x509_crt_parse_der(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1462 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
1463 const unsigned char *buf,
1464 size_t buflen )
1465 {
1466 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 1, NULL, NULL ) );
1467 }
1468
1469 /*
1470 * Parse one or more PEM certificates from a buffer and add them to the chained
1471 * list
1472 */
mbedtls_x509_crt_parse(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1473 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain,
1474 const unsigned char *buf,
1475 size_t buflen )
1476 {
1477 #if defined(MBEDTLS_PEM_PARSE_C)
1478 int success = 0, first_error = 0, total_failed = 0;
1479 int buf_format = MBEDTLS_X509_FORMAT_DER;
1480 #endif
1481
1482 /*
1483 * Check for valid input
1484 */
1485 if( chain == NULL || buf == NULL )
1486 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1487
1488 /*
1489 * Determine buffer content. Buffer contains either one DER certificate or
1490 * one or more PEM certificates.
1491 */
1492 #if defined(MBEDTLS_PEM_PARSE_C)
1493 if( buflen != 0 && buf[buflen - 1] == '\0' &&
1494 strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
1495 {
1496 buf_format = MBEDTLS_X509_FORMAT_PEM;
1497 }
1498
1499 if( buf_format == MBEDTLS_X509_FORMAT_DER )
1500 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
1501 #else
1502 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
1503 #endif
1504
1505 #if defined(MBEDTLS_PEM_PARSE_C)
1506 if( buf_format == MBEDTLS_X509_FORMAT_PEM )
1507 {
1508 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1509 mbedtls_pem_context pem;
1510
1511 /* 1 rather than 0 since the terminating NULL byte is counted in */
1512 while( buflen > 1 )
1513 {
1514 size_t use_len;
1515 mbedtls_pem_init( &pem );
1516
1517 /* If we get there, we know the string is null-terminated */
1518 ret = mbedtls_pem_read_buffer( &pem,
1519 "-----BEGIN CERTIFICATE-----",
1520 "-----END CERTIFICATE-----",
1521 buf, NULL, 0, &use_len );
1522
1523 if( ret == 0 )
1524 {
1525 /*
1526 * Was PEM encoded
1527 */
1528 buflen -= use_len;
1529 buf += use_len;
1530 }
1531 else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA )
1532 {
1533 return( ret );
1534 }
1535 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1536 {
1537 mbedtls_pem_free( &pem );
1538
1539 /*
1540 * PEM header and footer were found
1541 */
1542 buflen -= use_len;
1543 buf += use_len;
1544
1545 if( first_error == 0 )
1546 first_error = ret;
1547
1548 total_failed++;
1549 continue;
1550 }
1551 else
1552 break;
1553
1554 ret = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen );
1555
1556 mbedtls_pem_free( &pem );
1557
1558 if( ret != 0 )
1559 {
1560 /*
1561 * Quit parsing on a memory error
1562 */
1563 if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED )
1564 return( ret );
1565
1566 if( first_error == 0 )
1567 first_error = ret;
1568
1569 total_failed++;
1570 continue;
1571 }
1572
1573 success = 1;
1574 }
1575 }
1576
1577 if( success )
1578 return( total_failed );
1579 else if( first_error )
1580 return( first_error );
1581 else
1582 return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT );
1583 #endif /* MBEDTLS_PEM_PARSE_C */
1584 }
1585
1586 #if defined(MBEDTLS_FS_IO)
1587 /*
1588 * Load one or more certificates and add them to the chained list
1589 */
mbedtls_x509_crt_parse_file(mbedtls_x509_crt * chain,const char * path)1590 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path )
1591 {
1592 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1593 size_t n;
1594 unsigned char *buf;
1595
1596 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
1597 return( ret );
1598
1599 ret = mbedtls_x509_crt_parse( chain, buf, n );
1600
1601 mbedtls_platform_zeroize( buf, n );
1602 mbedtls_free( buf );
1603
1604 return( ret );
1605 }
1606
1607 #ifndef ESCP_MBDTLS_CUSTOMIZATION
mbedtls_x509_crt_parse_path(mbedtls_x509_crt * chain,const char * path)1608 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path )
1609 {
1610 int ret = 0;
1611 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
1612 int w_ret;
1613 WCHAR szDir[MAX_PATH];
1614 char filename[MAX_PATH];
1615 char *p;
1616 size_t len = strlen( path );
1617
1618 WIN32_FIND_DATAW file_data;
1619 HANDLE hFind;
1620
1621 if( len > MAX_PATH - 3 )
1622 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1623
1624 memset( szDir, 0, sizeof(szDir) );
1625 memset( filename, 0, MAX_PATH );
1626 memcpy( filename, path, len );
1627 filename[len++] = '\\';
1628 p = filename + len;
1629 filename[len++] = '*';
1630
1631 w_ret = MultiByteToWideChar( CP_ACP, 0, filename, (int)len, szDir,
1632 MAX_PATH - 3 );
1633 if( w_ret == 0 )
1634 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1635
1636 hFind = FindFirstFileW( szDir, &file_data );
1637 if( hFind == INVALID_HANDLE_VALUE )
1638 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1639
1640 len = MAX_PATH - len;
1641 do
1642 {
1643 memset( p, 0, len );
1644
1645 if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
1646 continue;
1647
1648 w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName,
1649 lstrlenW( file_data.cFileName ),
1650 p, (int) len - 1,
1651 NULL, NULL );
1652 if( w_ret == 0 )
1653 {
1654 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1655 goto cleanup;
1656 }
1657
1658 w_ret = mbedtls_x509_crt_parse_file( chain, filename );
1659 if( w_ret < 0 )
1660 ret++;
1661 else
1662 ret += w_ret;
1663 }
1664 while( FindNextFileW( hFind, &file_data ) != 0 );
1665
1666 if( GetLastError() != ERROR_NO_MORE_FILES )
1667 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1668
1669 cleanup:
1670 FindClose( hFind );
1671 #else /* _WIN32 */
1672 int t_ret;
1673 int snp_ret;
1674 struct stat sb;
1675 struct dirent *entry;
1676 char entry_name[MBEDTLS_X509_MAX_FILE_PATH_LEN];
1677 DIR *dir = opendir( path );
1678
1679 if( dir == NULL )
1680 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1681
1682 #if defined(MBEDTLS_THREADING_C)
1683 if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 )
1684 {
1685 closedir( dir );
1686 return( ret );
1687 }
1688 #endif /* MBEDTLS_THREADING_C */
1689
1690 memset( &sb, 0, sizeof( sb ) );
1691
1692 while( ( entry = readdir( dir ) ) != NULL )
1693 {
1694 snp_ret = mbedtls_snprintf( entry_name, sizeof entry_name,
1695 "%s/%s", path, entry->d_name );
1696
1697 if( snp_ret < 0 || (size_t)snp_ret >= sizeof entry_name )
1698 {
1699 ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
1700 goto cleanup;
1701 }
1702 else if( stat( entry_name, &sb ) == -1 )
1703 {
1704 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1705 goto cleanup;
1706 }
1707
1708 if( !S_ISREG( sb.st_mode ) )
1709 continue;
1710
1711 // Ignore parse errors
1712 //
1713 t_ret = mbedtls_x509_crt_parse_file( chain, entry_name );
1714 if( t_ret < 0 )
1715 ret++;
1716 else
1717 ret += t_ret;
1718 }
1719
1720 cleanup:
1721 closedir( dir );
1722
1723 #if defined(MBEDTLS_THREADING_C)
1724 if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 )
1725 ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
1726 #endif /* MBEDTLS_THREADING_C */
1727
1728 #endif /* _WIN32 */
1729
1730 return( ret );
1731 }
1732 #endif
1733 #endif /* MBEDTLS_FS_IO */
1734
1735 /*
1736 * OtherName ::= SEQUENCE {
1737 * type-id OBJECT IDENTIFIER,
1738 * value [0] EXPLICIT ANY DEFINED BY type-id }
1739 *
1740 * HardwareModuleName ::= SEQUENCE {
1741 * hwType OBJECT IDENTIFIER,
1742 * hwSerialNum OCTET STRING }
1743 *
1744 * NOTE: we currently only parse and use otherName of type HwModuleName,
1745 * as defined in RFC 4108.
1746 */
x509_get_other_name(const mbedtls_x509_buf * subject_alt_name,mbedtls_x509_san_other_name * other_name)1747 static int x509_get_other_name( const mbedtls_x509_buf *subject_alt_name,
1748 mbedtls_x509_san_other_name *other_name )
1749 {
1750 int ret = 0;
1751 size_t len;
1752 unsigned char *p = subject_alt_name->p;
1753 const unsigned char *end = p + subject_alt_name->len;
1754 mbedtls_x509_buf cur_oid;
1755
1756 if( ( subject_alt_name->tag &
1757 ( MBEDTLS_ASN1_TAG_CLASS_MASK | MBEDTLS_ASN1_TAG_VALUE_MASK ) ) !=
1758 ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ) )
1759 {
1760 /*
1761 * The given subject alternative name is not of type "othername".
1762 */
1763 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1764 }
1765
1766 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1767 MBEDTLS_ASN1_OID ) ) != 0 )
1768 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1769
1770 cur_oid.tag = MBEDTLS_ASN1_OID;
1771 cur_oid.p = p;
1772 cur_oid.len = len;
1773
1774 /*
1775 * Only HwModuleName is currently supported.
1776 */
1777 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME, &cur_oid ) != 0 )
1778 {
1779 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1780 }
1781
1782 if( p + len >= end )
1783 {
1784 mbedtls_platform_zeroize( other_name, sizeof( *other_name ) );
1785 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1786 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1787 }
1788 p += len;
1789 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1790 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 )
1791 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1792
1793 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1794 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1795 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1796
1797 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OID ) ) != 0 )
1798 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1799
1800 other_name->value.hardware_module_name.oid.tag = MBEDTLS_ASN1_OID;
1801 other_name->value.hardware_module_name.oid.p = p;
1802 other_name->value.hardware_module_name.oid.len = len;
1803
1804 if( p + len >= end )
1805 {
1806 mbedtls_platform_zeroize( other_name, sizeof( *other_name ) );
1807 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1808 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1809 }
1810 p += len;
1811 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1812 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
1813 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1814
1815 other_name->value.hardware_module_name.val.tag = MBEDTLS_ASN1_OCTET_STRING;
1816 other_name->value.hardware_module_name.val.p = p;
1817 other_name->value.hardware_module_name.val.len = len;
1818 p += len;
1819 if( p != end )
1820 {
1821 mbedtls_platform_zeroize( other_name,
1822 sizeof( *other_name ) );
1823 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1824 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1825 }
1826 return( 0 );
1827 }
1828
mbedtls_x509_parse_subject_alt_name(const mbedtls_x509_buf * san_buf,mbedtls_x509_subject_alternative_name * san)1829 int mbedtls_x509_parse_subject_alt_name( const mbedtls_x509_buf *san_buf,
1830 mbedtls_x509_subject_alternative_name *san )
1831 {
1832 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1833 switch( san_buf->tag &
1834 ( MBEDTLS_ASN1_TAG_CLASS_MASK |
1835 MBEDTLS_ASN1_TAG_VALUE_MASK ) )
1836 {
1837 /*
1838 * otherName
1839 */
1840 case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ):
1841 {
1842 mbedtls_x509_san_other_name other_name;
1843
1844 ret = x509_get_other_name( san_buf, &other_name );
1845 if( ret != 0 )
1846 return( ret );
1847
1848 memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) );
1849 san->type = MBEDTLS_X509_SAN_OTHER_NAME;
1850 memcpy( &san->san.other_name,
1851 &other_name, sizeof( other_name ) );
1852
1853 }
1854 break;
1855
1856 /*
1857 * dNSName
1858 */
1859 case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_DNS_NAME ):
1860 {
1861 memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) );
1862 san->type = MBEDTLS_X509_SAN_DNS_NAME;
1863
1864 memcpy( &san->san.unstructured_name,
1865 san_buf, sizeof( *san_buf ) );
1866
1867 }
1868 break;
1869
1870 /*
1871 * Type not supported
1872 */
1873 default:
1874 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1875 }
1876 return( 0 );
1877 }
1878
1879 #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)1880 static int x509_info_subject_alt_name( char **buf, size_t *size,
1881 const mbedtls_x509_sequence
1882 *subject_alt_name,
1883 const char *prefix )
1884 {
1885 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1886 size_t n = *size;
1887 char *p = *buf;
1888 const mbedtls_x509_sequence *cur = subject_alt_name;
1889 mbedtls_x509_subject_alternative_name san;
1890 int parse_ret;
1891
1892 while( cur != NULL )
1893 {
1894 memset( &san, 0, sizeof( san ) );
1895 parse_ret = mbedtls_x509_parse_subject_alt_name( &cur->buf, &san );
1896 if( parse_ret != 0 )
1897 {
1898 if( parse_ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
1899 {
1900 ret = mbedtls_snprintf( p, n, "\n%s <unsupported>", prefix );
1901 MBEDTLS_X509_SAFE_SNPRINTF;
1902 }
1903 else
1904 {
1905 ret = mbedtls_snprintf( p, n, "\n%s <malformed>", prefix );
1906 MBEDTLS_X509_SAFE_SNPRINTF;
1907 }
1908 cur = cur->next;
1909 continue;
1910 }
1911
1912 switch( san.type )
1913 {
1914 /*
1915 * otherName
1916 */
1917 case MBEDTLS_X509_SAN_OTHER_NAME:
1918 {
1919 mbedtls_x509_san_other_name *other_name = &san.san.other_name;
1920
1921 ret = mbedtls_snprintf( p, n, "\n%s otherName :", prefix );
1922 MBEDTLS_X509_SAFE_SNPRINTF;
1923
1924 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME,
1925 &other_name->value.hardware_module_name.oid ) != 0 )
1926 {
1927 ret = mbedtls_snprintf( p, n, "\n%s hardware module name :", prefix );
1928 MBEDTLS_X509_SAFE_SNPRINTF;
1929 ret = mbedtls_snprintf( p, n, "\n%s hardware type : ", prefix );
1930 MBEDTLS_X509_SAFE_SNPRINTF;
1931
1932 ret = mbedtls_oid_get_numeric_string( p, n, &other_name->value.hardware_module_name.oid );
1933 MBEDTLS_X509_SAFE_SNPRINTF;
1934
1935 ret = mbedtls_snprintf( p, n, "\n%s hardware serial number : ", prefix );
1936 MBEDTLS_X509_SAFE_SNPRINTF;
1937
1938 if( other_name->value.hardware_module_name.val.len >= n )
1939 {
1940 *p = '\0';
1941 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );
1942 }
1943
1944 memcpy( p, other_name->value.hardware_module_name.val.p,
1945 other_name->value.hardware_module_name.val.len );
1946 p += other_name->value.hardware_module_name.val.len;
1947
1948 n -= other_name->value.hardware_module_name.val.len;
1949
1950 }/* MBEDTLS_OID_ON_HW_MODULE_NAME */
1951 }
1952 break;
1953
1954 /*
1955 * dNSName
1956 */
1957 case MBEDTLS_X509_SAN_DNS_NAME:
1958 {
1959 ret = mbedtls_snprintf( p, n, "\n%s dNSName : ", prefix );
1960 MBEDTLS_X509_SAFE_SNPRINTF;
1961 if( san.san.unstructured_name.len >= n )
1962 {
1963 *p = '\0';
1964 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );
1965 }
1966
1967 memcpy( p, san.san.unstructured_name.p, san.san.unstructured_name.len );
1968 p += san.san.unstructured_name.len;
1969 n -= san.san.unstructured_name.len;
1970 }
1971 break;
1972
1973 /*
1974 * Type not supported, skip item.
1975 */
1976 default:
1977 ret = mbedtls_snprintf( p, n, "\n%s <unsupported>", prefix );
1978 MBEDTLS_X509_SAFE_SNPRINTF;
1979 break;
1980 }
1981
1982 cur = cur->next;
1983 }
1984
1985 *p = '\0';
1986
1987 *size = n;
1988 *buf = p;
1989
1990 return( 0 );
1991 }
1992
1993 #define PRINT_ITEM(i) \
1994 { \
1995 ret = mbedtls_snprintf( p, n, "%s" i, sep ); \
1996 MBEDTLS_X509_SAFE_SNPRINTF; \
1997 sep = ", "; \
1998 }
1999
2000 #define CERT_TYPE(type,name) \
2001 if( ns_cert_type & (type) ) \
2002 PRINT_ITEM( name );
2003
x509_info_cert_type(char ** buf,size_t * size,unsigned char ns_cert_type)2004 static int x509_info_cert_type( char **buf, size_t *size,
2005 unsigned char ns_cert_type )
2006 {
2007 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2008 size_t n = *size;
2009 char *p = *buf;
2010 const char *sep = "";
2011
2012 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" );
2013 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" );
2014 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" );
2015 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" );
2016 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" );
2017 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" );
2018 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" );
2019 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" );
2020
2021 *size = n;
2022 *buf = p;
2023
2024 return( 0 );
2025 }
2026
2027 #define KEY_USAGE(code,name) \
2028 if( key_usage & (code) ) \
2029 PRINT_ITEM( name );
2030
x509_info_key_usage(char ** buf,size_t * size,unsigned int key_usage)2031 static int x509_info_key_usage( char **buf, size_t *size,
2032 unsigned int key_usage )
2033 {
2034 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2035 size_t n = *size;
2036 char *p = *buf;
2037 const char *sep = "";
2038
2039 KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" );
2040 KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" );
2041 KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" );
2042 KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" );
2043 KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" );
2044 KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" );
2045 KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" );
2046 KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" );
2047 KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" );
2048
2049 *size = n;
2050 *buf = p;
2051
2052 return( 0 );
2053 }
2054
x509_info_ext_key_usage(char ** buf,size_t * size,const mbedtls_x509_sequence * extended_key_usage)2055 static int x509_info_ext_key_usage( char **buf, size_t *size,
2056 const mbedtls_x509_sequence *extended_key_usage )
2057 {
2058 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2059 const char *desc;
2060 size_t n = *size;
2061 char *p = *buf;
2062 const mbedtls_x509_sequence *cur = extended_key_usage;
2063 const char *sep = "";
2064
2065 while( cur != NULL )
2066 {
2067 if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 )
2068 desc = "???";
2069
2070 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
2071 MBEDTLS_X509_SAFE_SNPRINTF;
2072
2073 sep = ", ";
2074
2075 cur = cur->next;
2076 }
2077
2078 *size = n;
2079 *buf = p;
2080
2081 return( 0 );
2082 }
2083
x509_info_cert_policies(char ** buf,size_t * size,const mbedtls_x509_sequence * certificate_policies)2084 static int x509_info_cert_policies( char **buf, size_t *size,
2085 const mbedtls_x509_sequence *certificate_policies )
2086 {
2087 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2088 const char *desc;
2089 size_t n = *size;
2090 char *p = *buf;
2091 const mbedtls_x509_sequence *cur = certificate_policies;
2092 const char *sep = "";
2093
2094 while( cur != NULL )
2095 {
2096 if( mbedtls_oid_get_certificate_policies( &cur->buf, &desc ) != 0 )
2097 desc = "???";
2098
2099 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
2100 MBEDTLS_X509_SAFE_SNPRINTF;
2101
2102 sep = ", ";
2103
2104 cur = cur->next;
2105 }
2106
2107 *size = n;
2108 *buf = p;
2109
2110 return( 0 );
2111 }
2112
2113 /*
2114 * Return an informational string about the certificate.
2115 */
2116 #define BEFORE_COLON 18
2117 #define BC "18"
mbedtls_x509_crt_info(char * buf,size_t size,const char * prefix,const mbedtls_x509_crt * crt)2118 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
2119 const mbedtls_x509_crt *crt )
2120 {
2121 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2122 size_t n;
2123 char *p;
2124 char key_size_str[BEFORE_COLON];
2125
2126 p = buf;
2127 n = size;
2128
2129 if( NULL == crt )
2130 {
2131 ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" );
2132 MBEDTLS_X509_SAFE_SNPRINTF;
2133
2134 return( (int) ( size - n ) );
2135 }
2136
2137 ret = mbedtls_snprintf( p, n, "%scert. version : %d\n",
2138 prefix, crt->version );
2139 MBEDTLS_X509_SAFE_SNPRINTF;
2140 ret = mbedtls_snprintf( p, n, "%sserial number : ",
2141 prefix );
2142 MBEDTLS_X509_SAFE_SNPRINTF;
2143
2144 ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
2145 MBEDTLS_X509_SAFE_SNPRINTF;
2146
2147 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix );
2148 MBEDTLS_X509_SAFE_SNPRINTF;
2149 ret = mbedtls_x509_dn_gets( p, n, &crt->issuer );
2150 MBEDTLS_X509_SAFE_SNPRINTF;
2151
2152 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
2153 MBEDTLS_X509_SAFE_SNPRINTF;
2154 ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
2155 MBEDTLS_X509_SAFE_SNPRINTF;
2156
2157 ret = mbedtls_snprintf( p, n, "\n%sissued on : " \
2158 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
2159 crt->valid_from.year, crt->valid_from.mon,
2160 crt->valid_from.day, crt->valid_from.hour,
2161 crt->valid_from.min, crt->valid_from.sec );
2162 MBEDTLS_X509_SAFE_SNPRINTF;
2163
2164 ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \
2165 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
2166 crt->valid_to.year, crt->valid_to.mon,
2167 crt->valid_to.day, crt->valid_to.hour,
2168 crt->valid_to.min, crt->valid_to.sec );
2169 MBEDTLS_X509_SAFE_SNPRINTF;
2170
2171 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
2172 MBEDTLS_X509_SAFE_SNPRINTF;
2173
2174 ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk,
2175 crt->sig_md, crt->sig_opts );
2176 MBEDTLS_X509_SAFE_SNPRINTF;
2177
2178 /* Key size */
2179 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
2180 mbedtls_pk_get_name( &crt->pk ) ) ) != 0 )
2181 {
2182 return( ret );
2183 }
2184
2185 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str,
2186 (int) mbedtls_pk_get_bitlen( &crt->pk ) );
2187 MBEDTLS_X509_SAFE_SNPRINTF;
2188
2189 /*
2190 * Optional extensions
2191 */
2192
2193 if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS )
2194 {
2195 ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix,
2196 crt->ca_istrue ? "true" : "false" );
2197 MBEDTLS_X509_SAFE_SNPRINTF;
2198
2199 if( crt->max_pathlen > 0 )
2200 {
2201 ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 );
2202 MBEDTLS_X509_SAFE_SNPRINTF;
2203 }
2204 }
2205
2206 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
2207 {
2208 ret = mbedtls_snprintf( p, n, "\n%ssubject alt name :", prefix );
2209 MBEDTLS_X509_SAFE_SNPRINTF;
2210
2211 if( ( ret = x509_info_subject_alt_name( &p, &n,
2212 &crt->subject_alt_names,
2213 prefix ) ) != 0 )
2214 return( ret );
2215 }
2216
2217 if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE )
2218 {
2219 ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix );
2220 MBEDTLS_X509_SAFE_SNPRINTF;
2221
2222 if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 )
2223 return( ret );
2224 }
2225
2226 if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE )
2227 {
2228 ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix );
2229 MBEDTLS_X509_SAFE_SNPRINTF;
2230
2231 if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 )
2232 return( ret );
2233 }
2234
2235 if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE )
2236 {
2237 ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix );
2238 MBEDTLS_X509_SAFE_SNPRINTF;
2239
2240 if( ( ret = x509_info_ext_key_usage( &p, &n,
2241 &crt->ext_key_usage ) ) != 0 )
2242 return( ret );
2243 }
2244
2245 if( crt->ext_types & MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES )
2246 {
2247 ret = mbedtls_snprintf( p, n, "\n%scertificate policies : ", prefix );
2248 MBEDTLS_X509_SAFE_SNPRINTF;
2249
2250 if( ( ret = x509_info_cert_policies( &p, &n,
2251 &crt->certificate_policies ) ) != 0 )
2252 return( ret );
2253 }
2254
2255 ret = mbedtls_snprintf( p, n, "\n" );
2256 MBEDTLS_X509_SAFE_SNPRINTF;
2257
2258 return( (int) ( size - n ) );
2259 }
2260
2261 struct x509_crt_verify_string {
2262 int code;
2263 const char *string;
2264 };
2265
2266 #define X509_CRT_ERROR_INFO( err, err_str, info ) { err, info },
2267 static const struct x509_crt_verify_string x509_crt_verify_strings[] = {
2268 MBEDTLS_X509_CRT_ERROR_INFO_LIST
2269 { 0, NULL }
2270 };
2271 #undef X509_CRT_ERROR_INFO
2272
mbedtls_x509_crt_verify_info(char * buf,size_t size,const char * prefix,uint32_t flags)2273 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
2274 uint32_t flags )
2275 {
2276 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2277 const struct x509_crt_verify_string *cur;
2278 char *p = buf;
2279 size_t n = size;
2280
2281 for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ )
2282 {
2283 if( ( flags & cur->code ) == 0 )
2284 continue;
2285
2286 ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string );
2287 MBEDTLS_X509_SAFE_SNPRINTF;
2288 flags ^= cur->code;
2289 }
2290
2291 if( flags != 0 )
2292 {
2293 ret = mbedtls_snprintf( p, n, "%sUnknown reason "
2294 "(this should not happen)\n", prefix );
2295 MBEDTLS_X509_SAFE_SNPRINTF;
2296 }
2297
2298 return( (int) ( size - n ) );
2299 }
2300 #endif /* MBEDTLS_X509_REMOVE_INFO */
2301
mbedtls_x509_crt_check_key_usage(const mbedtls_x509_crt * crt,unsigned int usage)2302 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
2303 unsigned int usage )
2304 {
2305 unsigned int usage_must, usage_may;
2306 unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY
2307 | MBEDTLS_X509_KU_DECIPHER_ONLY;
2308
2309 if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 )
2310 return( 0 );
2311
2312 usage_must = usage & ~may_mask;
2313
2314 if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must )
2315 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2316
2317 usage_may = usage & may_mask;
2318
2319 if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may )
2320 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2321
2322 return( 0 );
2323 }
2324
mbedtls_x509_crt_check_extended_key_usage(const mbedtls_x509_crt * crt,const char * usage_oid,size_t usage_len)2325 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
2326 const char *usage_oid,
2327 size_t usage_len )
2328 {
2329 const mbedtls_x509_sequence *cur;
2330
2331 /* Extension is not mandatory, absent means no restriction */
2332 if( ( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 )
2333 return( 0 );
2334
2335 /*
2336 * Look for the requested usage (or wildcard ANY) in our list
2337 */
2338 for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next )
2339 {
2340 const mbedtls_x509_buf *cur_oid = &cur->buf;
2341
2342 if( cur_oid->len == usage_len &&
2343 memcmp( cur_oid->p, usage_oid, usage_len ) == 0 )
2344 {
2345 return( 0 );
2346 }
2347
2348 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 )
2349 return( 0 );
2350 }
2351
2352 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2353 }
2354
2355 #if defined(MBEDTLS_X509_CRL_PARSE_C)
2356 /*
2357 * Return 1 if the certificate is revoked, or 0 otherwise.
2358 */
mbedtls_x509_crt_is_revoked(const mbedtls_x509_crt * crt,const mbedtls_x509_crl * crl)2359 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl )
2360 {
2361 const mbedtls_x509_crl_entry *cur = &crl->entry;
2362
2363 while( cur != NULL && cur->serial.len != 0 )
2364 {
2365 if( crt->serial.len == cur->serial.len &&
2366 memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 )
2367 {
2368 return( 1 );
2369 }
2370
2371 cur = cur->next;
2372 }
2373
2374 return( 0 );
2375 }
2376
2377 /*
2378 * Check that the given certificate is not revoked according to the CRL.
2379 * Skip validation if no CRL for the given CA is present.
2380 */
x509_crt_verifycrl(mbedtls_x509_crt * crt,mbedtls_x509_crt * ca,mbedtls_x509_crl * crl_list,const mbedtls_x509_crt_profile * profile)2381 static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
2382 mbedtls_x509_crl *crl_list,
2383 const mbedtls_x509_crt_profile *profile )
2384 {
2385 int flags = 0;
2386 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
2387 const mbedtls_md_info_t *md_info;
2388
2389 if( ca == NULL )
2390 return( flags );
2391
2392 while( crl_list != NULL )
2393 {
2394 if( crl_list->version == 0 ||
2395 x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 )
2396 {
2397 crl_list = crl_list->next;
2398 continue;
2399 }
2400
2401 /*
2402 * Check if the CA is configured to sign CRLs
2403 */
2404 if( mbedtls_x509_crt_check_key_usage( ca,
2405 MBEDTLS_X509_KU_CRL_SIGN ) != 0 )
2406 {
2407 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2408 break;
2409 }
2410
2411 /*
2412 * Check if CRL is correctly signed by the trusted CA
2413 */
2414 if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 )
2415 flags |= MBEDTLS_X509_BADCRL_BAD_MD;
2416
2417 if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 )
2418 flags |= MBEDTLS_X509_BADCRL_BAD_PK;
2419
2420 md_info = mbedtls_md_info_from_type( crl_list->sig_md );
2421 if( mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ) != 0 )
2422 {
2423 /* Note: this can't happen except after an internal error */
2424 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2425 break;
2426 }
2427
2428 if( x509_profile_check_key( profile, &ca->pk ) != 0 )
2429 flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
2430
2431 if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk,
2432 crl_list->sig_md, hash, mbedtls_md_get_size( md_info ),
2433 crl_list->sig.p, crl_list->sig.len ) != 0 )
2434 {
2435 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2436 break;
2437 }
2438
2439 #if defined(VENDOR_CUSTOMISE_CHECK_CERT_DATE_C)
2440 /* 定制处理，是否定制校验证书有效期，回调业务函数自己处理 */
2441 if (g_mbedtls_customize_crl_date_checker != NULL)
2442 {
2443 flags |= g_mbedtls_customize_crl_date_checker(crl_list);
2444 }
2445 else // 没有注册处理函数，按默认规则处理
2446 {
2447 if( mbedtls_x509_time_is_past( &crl_list->next_update ) )
2448 flags |= MBEDTLS_X509_BADCRL_EXPIRED;
2449
2450 if( mbedtls_x509_time_is_future( &crl_list->this_update ) )
2451 flags |= MBEDTLS_X509_BADCRL_FUTURE;
2452 }
2453 #else
2454 /*
2455 * Check for validity of CRL (Do not drop out)
2456 */
2457 if( mbedtls_x509_time_is_past( &crl_list->next_update ) )
2458 flags |= MBEDTLS_X509_BADCRL_EXPIRED;
2459
2460 if( mbedtls_x509_time_is_future( &crl_list->this_update ) )
2461 flags |= MBEDTLS_X509_BADCRL_FUTURE;
2462 #endif
2463 /*
2464 * Check if certificate is revoked
2465 */
2466 if( mbedtls_x509_crt_is_revoked( crt, crl_list ) )
2467 {
2468 flags |= MBEDTLS_X509_BADCERT_REVOKED;
2469 break;
2470 }
2471
2472 crl_list = crl_list->next;
2473 }
2474
2475 return( flags );
2476 }
2477 #endif /* MBEDTLS_X509_CRL_PARSE_C */
2478
2479 /*
2480 * Check the signature of a certificate by its parent
2481 */
x509_crt_check_signature(const mbedtls_x509_crt * child,mbedtls_x509_crt * parent,mbedtls_x509_crt_restart_ctx * rs_ctx)2482 static int x509_crt_check_signature( const mbedtls_x509_crt *child,
2483 mbedtls_x509_crt *parent,
2484 mbedtls_x509_crt_restart_ctx *rs_ctx )
2485 {
2486 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
2487 size_t hash_len;
2488 #if !defined(MBEDTLS_USE_PSA_CRYPTO)
2489 const mbedtls_md_info_t *md_info;
2490 md_info = mbedtls_md_info_from_type( child->sig_md );
2491 hash_len = mbedtls_md_get_size( md_info );
2492
2493 /* Note: hash errors can happen only after an internal error */
2494 if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 )
2495 return( -1 );
2496 #else
2497 psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT;
2498 psa_algorithm_t hash_alg = mbedtls_psa_translate_md( child->sig_md );
2499
2500 if( psa_hash_setup( &hash_operation, hash_alg ) != PSA_SUCCESS )
2501 return( -1 );
2502
2503 if( psa_hash_update( &hash_operation, child->tbs.p, child->tbs.len )
2504 != PSA_SUCCESS )
2505 {
2506 return( -1 );
2507 }
2508
2509 if( psa_hash_finish( &hash_operation, hash, sizeof( hash ), &hash_len )
2510 != PSA_SUCCESS )
2511 {
2512 return( -1 );
2513 }
2514 #endif /* MBEDTLS_USE_PSA_CRYPTO */
2515 /* Skip expensive computation on obvious mismatch */
2516 if( ! mbedtls_pk_can_do( &parent->pk, child->sig_pk ) )
2517 return( -1 );
2518
2519 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2520 if( rs_ctx != NULL && child->sig_pk == MBEDTLS_PK_ECDSA )
2521 {
2522 return( mbedtls_pk_verify_restartable( &parent->pk,
2523 child->sig_md, hash, hash_len,
2524 child->sig.p, child->sig.len, &rs_ctx->pk ) );
2525 }
2526 #else
2527 (void) rs_ctx;
2528 #endif
2529
2530 return( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk,
2531 child->sig_md, hash, hash_len,
2532 child->sig.p, child->sig.len ) );
2533 }
2534
2535 /*
2536 * Check if 'parent' is a suitable parent (signing CA) for 'child'.
2537 * Return 0 if yes, -1 if not.
2538 *
2539 * top means parent is a locally-trusted certificate
2540 */
x509_crt_check_parent(const mbedtls_x509_crt * child,const mbedtls_x509_crt * parent,int top)2541 static int x509_crt_check_parent( const mbedtls_x509_crt *child,
2542 const mbedtls_x509_crt *parent,
2543 int top )
2544 {
2545 int need_ca_bit;
2546
2547 /* Parent must be the issuer */
2548 if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 )
2549 return( -1 );
2550
2551 /* Parent must have the basicConstraints CA bit set as a general rule */
2552 need_ca_bit = 1;
2553
2554 /* Exception: v1/v2 certificates that are locally trusted. */
2555 if( top && parent->version < 3 )
2556 need_ca_bit = 0;
2557
2558 if( need_ca_bit && ! parent->ca_istrue )
2559 return( -1 );
2560
2561 if( need_ca_bit &&
2562 mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 )
2563 {
2564 return( -1 );
2565 }
2566
2567 return( 0 );
2568 }
2569
2570 /*
2571 * Find a suitable parent for child in candidates, or return NULL.
2572 *
2573 * Here suitable is defined as:
2574 * 1. subject name matches child's issuer
2575 * 2. if necessary, the CA bit is set and key usage allows signing certs
2576 * 3. for trusted roots, the signature is correct
2577 * (for intermediates, the signature is checked and the result reported)
2578 * 4. pathlen constraints are satisfied
2579 *
2580 * If there's a suitable candidate which is also time-valid, return the first
2581 * such. Otherwise, return the first suitable candidate (or NULL if there is
2582 * none).
2583 *
2584 * The rationale for this rule is that someone could have a list of trusted
2585 * roots with two versions on the same root with different validity periods.
2586 * (At least one user reported having such a list and wanted it to just work.)
2587 * The reason we don't just require time-validity is that generally there is
2588 * only one version, and if it's expired we want the flags to state that
2589 * rather than NOT_TRUSTED, as would be the case if we required it here.
2590 *
2591 * The rationale for rule 3 (signature for trusted roots) is that users might
2592 * have two versions of the same CA with different keys in their list, and the
2593 * way we select the correct one is by checking the signature (as we don't
2594 * rely on key identifier extensions). (This is one way users might choose to
2595 * handle key rollover, another relies on self-issued certs, see [SIRO].)
2596 *
2597 * Arguments:
2598 * - [in] child: certificate for which we're looking for a parent
2599 * - [in] candidates: chained list of potential parents
2600 * - [out] r_parent: parent found (or NULL)
2601 * - [out] r_signature_is_good: 1 if child signature by parent is valid, or 0
2602 * - [in] top: 1 if candidates consists of trusted roots, ie we're at the top
2603 * of the chain, 0 otherwise
2604 * - [in] path_cnt: number of intermediates seen so far
2605 * - [in] self_cnt: number of self-signed intermediates seen so far
2606 * (will never be greater than path_cnt)
2607 * - [in-out] rs_ctx: context for restarting operations
2608 *
2609 * Return value:
2610 * - 0 on success
2611 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
2612 */
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)2613 static int x509_crt_find_parent_in(
2614 mbedtls_x509_crt *child,
2615 mbedtls_x509_crt *candidates,
2616 mbedtls_x509_crt **r_parent,
2617 int *r_signature_is_good,
2618 int top,
2619 unsigned path_cnt,
2620 unsigned self_cnt,
2621 mbedtls_x509_crt_restart_ctx *rs_ctx )
2622 {
2623 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2624 mbedtls_x509_crt *parent, *fallback_parent;
2625 int signature_is_good = 0, fallback_signature_is_good;
2626
2627 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2628 /* did we have something in progress? */
2629 if( rs_ctx != NULL && rs_ctx->parent != NULL )
2630 {
2631 /* restore saved state */
2632 parent = rs_ctx->parent;
2633 fallback_parent = rs_ctx->fallback_parent;
2634 fallback_signature_is_good = rs_ctx->fallback_signature_is_good;
2635
2636 /* clear saved state */
2637 rs_ctx->parent = NULL;
2638 rs_ctx->fallback_parent = NULL;
2639 rs_ctx->fallback_signature_is_good = 0;
2640
2641 /* resume where we left */
2642 goto check_signature;
2643 }
2644 #endif
2645
2646 fallback_parent = NULL;
2647 fallback_signature_is_good = 0;
2648
2649 for( parent = candidates; parent != NULL; parent = parent->next )
2650 {
2651 /* basic parenting skills (name, CA bit, key usage) */
2652 if( x509_crt_check_parent( child, parent, top ) != 0 )
2653 continue;
2654
2655 /* +1 because stored max_pathlen is 1 higher that the actual value */
2656 if( parent->max_pathlen > 0 &&
2657 (size_t) parent->max_pathlen < 1 + path_cnt - self_cnt )
2658 {
2659 continue;
2660 }
2661
2662 /* Signature */
2663 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2664 check_signature:
2665 #endif
2666 ret = x509_crt_check_signature( child, parent, rs_ctx );
2667
2668 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2669 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2670 {
2671 /* save state */
2672 rs_ctx->parent = parent;
2673 rs_ctx->fallback_parent = fallback_parent;
2674 rs_ctx->fallback_signature_is_good = fallback_signature_is_good;
2675
2676 return( ret );
2677 }
2678 #else
2679 (void) ret;
2680 #endif
2681
2682 signature_is_good = ret == 0;
2683 if( top && ! signature_is_good )
2684 continue;
2685
2686 #if defined(VENDOR_CUSTOMISE_CHECK_CERT_DATE_C)
2687 /* 定制处理，是否定制校验证书有效期，回调业务函数自己处理 */
2688 if (g_mbedtls_customize_cert_date_checker != NULL)
2689 {
2690 if (g_mbedtls_customize_cert_date_checker(parent) != 0)
2691 {
2692 if( fallback_parent == NULL )
2693 {
2694 fallback_parent = parent;
2695 fallback_signature_is_good = signature_is_good;
2696 }
2697 continue;
2698 }
2699 }
2700 else /* 如果没有挂回调函数，则按官方默认方式处理 */
2701 {
2702 /* optional time check */
2703 if( mbedtls_x509_time_is_past( &parent->valid_to ) ||
2704 mbedtls_x509_time_is_future( &parent->valid_from ) )
2705 {
2706 if( fallback_parent == NULL )
2707 {
2708 fallback_parent = parent;
2709 fallback_signature_is_good = signature_is_good;
2710 }
2711
2712 continue;
2713 }
2714 }
2715 #else
2716 /* optional time check */
2717 if( mbedtls_x509_time_is_past( &parent->valid_to ) ||
2718 mbedtls_x509_time_is_future( &parent->valid_from ) )
2719 {
2720 if( fallback_parent == NULL )
2721 {
2722 fallback_parent = parent;
2723 fallback_signature_is_good = signature_is_good;
2724 }
2725
2726 continue;
2727 }
2728 #endif
2729
2730 *r_parent = parent;
2731 *r_signature_is_good = signature_is_good;
2732
2733 break;
2734 }
2735
2736 if( parent == NULL )
2737 {
2738 *r_parent = fallback_parent;
2739 *r_signature_is_good = fallback_signature_is_good;
2740 }
2741
2742 return( 0 );
2743 }
2744
2745 /*
2746 * Find a parent in trusted CAs or the provided chain, or return NULL.
2747 *
2748 * Searches in trusted CAs first, and return the first suitable parent found
2749 * (see find_parent_in() for definition of suitable).
2750 *
2751 * Arguments:
2752 * - [in] child: certificate for which we're looking for a parent, followed
2753 * by a chain of possible intermediates
2754 * - [in] trust_ca: list of locally trusted certificates
2755 * - [out] parent: parent found (or NULL)
2756 * - [out] parent_is_trusted: 1 if returned `parent` is trusted, or 0
2757 * - [out] signature_is_good: 1 if child signature by parent is valid, or 0
2758 * - [in] path_cnt: number of links in the chain so far (EE -> ... -> child)
2759 * - [in] self_cnt: number of self-signed certs in the chain so far
2760 * (will always be no greater than path_cnt)
2761 * - [in-out] rs_ctx: context for restarting operations
2762 *
2763 * Return value:
2764 * - 0 on success
2765 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
2766 */
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)2767 static int x509_crt_find_parent(
2768 mbedtls_x509_crt *child,
2769 mbedtls_x509_crt *trust_ca,
2770 mbedtls_x509_crt **parent,
2771 int *parent_is_trusted,
2772 int *signature_is_good,
2773 unsigned path_cnt,
2774 unsigned self_cnt,
2775 mbedtls_x509_crt_restart_ctx *rs_ctx )
2776 {
2777 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2778 mbedtls_x509_crt *search_list;
2779
2780 *parent_is_trusted = 1;
2781
2782 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2783 /* restore then clear saved state if we have some stored */
2784 if( rs_ctx != NULL && rs_ctx->parent_is_trusted != -1 )
2785 {
2786 *parent_is_trusted = rs_ctx->parent_is_trusted;
2787 rs_ctx->parent_is_trusted = -1;
2788 }
2789 #endif
2790
2791 while( 1 ) {
2792 search_list = *parent_is_trusted ? trust_ca : child->next;
2793
2794 ret = x509_crt_find_parent_in( child, search_list,
2795 parent, signature_is_good,
2796 *parent_is_trusted,
2797 path_cnt, self_cnt, rs_ctx );
2798
2799 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2800 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2801 {
2802 /* save state */
2803 rs_ctx->parent_is_trusted = *parent_is_trusted;
2804 return( ret );
2805 }
2806 #else
2807 (void) ret;
2808 #endif
2809
2810 /* stop here if found or already in second iteration */
2811 if( *parent != NULL || *parent_is_trusted == 0 )
2812 break;
2813
2814 /* prepare second iteration */
2815 *parent_is_trusted = 0;
2816 }
2817
2818 /* extra precaution against mistakes in the caller */
2819 if( *parent == NULL )
2820 {
2821 *parent_is_trusted = 0;
2822 *signature_is_good = 0;
2823 }
2824
2825 return( 0 );
2826 }
2827
2828 /*
2829 * Check if an end-entity certificate is locally trusted
2830 *
2831 * Currently we require such certificates to be self-signed (actually only
2832 * check for self-issued as self-signatures are not checked)
2833 */
x509_crt_check_ee_locally_trusted(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca)2834 static int x509_crt_check_ee_locally_trusted(
2835 mbedtls_x509_crt *crt,
2836 mbedtls_x509_crt *trust_ca )
2837 {
2838 mbedtls_x509_crt *cur;
2839
2840 /* must be self-issued */
2841 if( x509_name_cmp( &crt->issuer, &crt->subject ) != 0 )
2842 return( -1 );
2843
2844 /* look for an exact match with trusted cert */
2845 for( cur = trust_ca; cur != NULL; cur = cur->next )
2846 {
2847 if( crt->raw.len == cur->raw.len &&
2848 memcmp( crt->raw.p, cur->raw.p, crt->raw.len ) == 0 )
2849 {
2850 return( 0 );
2851 }
2852 }
2853
2854 /* too bad */
2855 return( -1 );
2856 }
2857
2858 /*
2859 * Build and verify a certificate chain
2860 *
2861 * Given a peer-provided list of certificates EE, C1, ..., Cn and
2862 * a list of trusted certs R1, ... Rp, try to build and verify a chain
2863 * EE, Ci1, ... Ciq [, Rj]
2864 * such that every cert in the chain is a child of the next one,
2865 * jumping to a trusted root as early as possible.
2866 *
2867 * Verify that chain and return it with flags for all issues found.
2868 *
2869 * Special cases:
2870 * - EE == Rj -> return a one-element list containing it
2871 * - EE, Ci1, ..., Ciq cannot be continued with a trusted root
2872 * -> return that chain with NOT_TRUSTED set on Ciq
2873 *
2874 * Tests for (aspects of) this function should include at least:
2875 * - trusted EE
2876 * - EE -> trusted root
2877 * - EE -> intermediate CA -> trusted root
2878 * - if relevant: EE untrusted
2879 * - if relevant: EE -> intermediate, untrusted
2880 * with the aspect under test checked at each relevant level (EE, int, root).
2881 * For some aspects longer chains are required, but usually length 2 is
2882 * enough (but length 1 is not in general).
2883 *
2884 * Arguments:
2885 * - [in] crt: the cert list EE, C1, ..., Cn
2886 * - [in] trust_ca: the trusted list R1, ..., Rp
2887 * - [in] ca_crl, profile: as in verify_with_profile()
2888 * - [out] ver_chain: the built and verified chain
2889 * Only valid when return value is 0, may contain garbage otherwise!
2890 * Restart note: need not be the same when calling again to resume.
2891 * - [in-out] rs_ctx: context for restarting operations
2892 *
2893 * Return value:
2894 * - non-zero if the chain could not be fully built and examined
2895 * - 0 is the chain was successfully built and examined,
2896 * even if it was found to be invalid
2897 */
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)2898 static int x509_crt_verify_chain(
2899 mbedtls_x509_crt *crt,
2900 mbedtls_x509_crt *trust_ca,
2901 mbedtls_x509_crl *ca_crl,
2902 mbedtls_x509_crt_ca_cb_t f_ca_cb,
2903 void *p_ca_cb,
2904 const mbedtls_x509_crt_profile *profile,
2905 mbedtls_x509_crt_verify_chain *ver_chain,
2906 mbedtls_x509_crt_restart_ctx *rs_ctx )
2907 {
2908 /* Don't initialize any of those variables here, so that the compiler can
2909 * catch potential issues with jumping ahead when restarting */
2910 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2911 uint32_t *flags;
2912 mbedtls_x509_crt_verify_chain_item *cur;
2913 mbedtls_x509_crt *child;
2914 mbedtls_x509_crt *parent;
2915 int parent_is_trusted;
2916 int child_is_trusted;
2917 int signature_is_good;
2918 unsigned self_cnt;
2919 mbedtls_x509_crt *cur_trust_ca = NULL;
2920
2921 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2922 /* resume if we had an operation in progress */
2923 if( rs_ctx != NULL && rs_ctx->in_progress == x509_crt_rs_find_parent )
2924 {
2925 /* restore saved state */
2926 *ver_chain = rs_ctx->ver_chain; /* struct copy */
2927 self_cnt = rs_ctx->self_cnt;
2928
2929 /* restore derived state */
2930 cur = &ver_chain->items[ver_chain->len - 1];
2931 child = cur->crt;
2932 flags = &cur->flags;
2933
2934 goto find_parent;
2935 }
2936 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
2937
2938 child = crt;
2939 self_cnt = 0;
2940 parent_is_trusted = 0;
2941 child_is_trusted = 0;
2942
2943 while( 1 ) {
2944 /* Add certificate to the verification chain */
2945 cur = &ver_chain->items[ver_chain->len];
2946 cur->crt = child;
2947 cur->flags = 0;
2948 ver_chain->len++;
2949 flags = &cur->flags;
2950
2951 #if defined(VENDOR_CUSTOMISE_CHECK_CERT_DATE_C)
2952 /* 定制处理，是否定制校验证书有效期，回调业务函数自己处理 */
2953 if (g_mbedtls_customize_cert_date_checker != NULL)
2954 {
2955 *flags |= g_mbedtls_customize_cert_date_checker( child );
2956 }
2957 else // 没有注册处理函数，按默认规则处理
2958 {
2959 /* Check time-validity (all certificates) */
2960 if( mbedtls_x509_time_is_past( &child->valid_to ) )
2961 *flags |= MBEDTLS_X509_BADCERT_EXPIRED;
2962
2963 if( mbedtls_x509_time_is_future( &child->valid_from ) )
2964 *flags |= MBEDTLS_X509_BADCERT_FUTURE;
2965 }
2966 #else
2967 /* Check time-validity (all certificates) */
2968 if( mbedtls_x509_time_is_past( &child->valid_to ) )
2969 *flags |= MBEDTLS_X509_BADCERT_EXPIRED;
2970
2971 if( mbedtls_x509_time_is_future( &child->valid_from ) )
2972 *flags |= MBEDTLS_X509_BADCERT_FUTURE;
2973 #endif
2974
2975 /* Stop here for trusted roots (but not for trusted EE certs) */
2976 if( child_is_trusted )
2977 return( 0 );
2978
2979 /* Check signature algorithm: MD & PK algs */
2980 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
2981 *flags |= MBEDTLS_X509_BADCERT_BAD_MD;
2982
2983 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
2984 *flags |= MBEDTLS_X509_BADCERT_BAD_PK;
2985
2986 /* Special case: EE certs that are locally trusted */
2987 if( ver_chain->len == 1 &&
2988 x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 )
2989 {
2990 return( 0 );
2991 }
2992
2993 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2994 find_parent:
2995 #endif
2996
2997 /* Obtain list of potential trusted signers from CA callback,
2998 * or use statically provided list. */
2999 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
3000 if( f_ca_cb != NULL )
3001 {
3002 mbedtls_x509_crt_free( ver_chain->trust_ca_cb_result );
3003 mbedtls_free( ver_chain->trust_ca_cb_result );
3004 ver_chain->trust_ca_cb_result = NULL;
3005
3006 ret = f_ca_cb( p_ca_cb, child, &ver_chain->trust_ca_cb_result );
3007 if( ret != 0 )
3008 return( MBEDTLS_ERR_X509_FATAL_ERROR );
3009
3010 cur_trust_ca = ver_chain->trust_ca_cb_result;
3011 }
3012 else
3013 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
3014 {
3015 ((void) f_ca_cb);
3016 ((void) p_ca_cb);
3017 cur_trust_ca = trust_ca;
3018 }
3019
3020 /* Look for a parent in trusted CAs or up the chain */
3021 ret = x509_crt_find_parent( child, cur_trust_ca, &parent,
3022 &parent_is_trusted, &signature_is_good,
3023 ver_chain->len - 1, self_cnt, rs_ctx );
3024
3025 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
3026 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
3027 {
3028 /* save state */
3029 rs_ctx->in_progress = x509_crt_rs_find_parent;
3030 rs_ctx->self_cnt = self_cnt;
3031 rs_ctx->ver_chain = *ver_chain; /* struct copy */
3032
3033 return( ret );
3034 }
3035 #else
3036 (void) ret;
3037 #endif
3038
3039 /* No parent? We're done here */
3040 if( parent == NULL )
3041 {
3042 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
3043 return( 0 );
3044 }
3045
3046 /* Count intermediate self-issued (not necessarily self-signed) certs.
3047 * These can occur with some strategies for key rollover, see [SIRO],
3048 * and should be excluded from max_pathlen checks. */
3049 if( ver_chain->len != 1 &&
3050 x509_name_cmp( &child->issuer, &child->subject ) == 0 )
3051 {
3052 self_cnt++;
3053 }
3054
3055 /* path_cnt is 0 for the first intermediate CA,
3056 * and if parent is trusted it's not an intermediate CA */
3057 if( ! parent_is_trusted &&
3058 ver_chain->len > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
3059 {
3060 /* return immediately to avoid overflow the chain array */
3061 return( MBEDTLS_ERR_X509_FATAL_ERROR );
3062 }
3063
3064 /* signature was checked while searching parent */
3065 if( ! signature_is_good )
3066 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
3067
3068 /* check size of signing key */
3069 if( x509_profile_check_key( profile, &parent->pk ) != 0 )
3070 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
3071
3072 #if defined(MBEDTLS_X509_CRL_PARSE_C)
3073 /* Check trusted CA's CRL for the given crt */
3074 *flags |= x509_crt_verifycrl( child, parent, ca_crl, profile );
3075 #else
3076 (void) ca_crl;
3077 #endif
3078
3079 /* prepare for next iteration */
3080 child = parent;
3081 parent = NULL;
3082 child_is_trusted = parent_is_trusted;
3083 signature_is_good = 0;
3084 }
3085 }
3086
3087 /*
3088 * Check for CN match
3089 */
x509_crt_check_cn(const mbedtls_x509_buf * name,const char * cn,size_t cn_len)3090 static int x509_crt_check_cn( const mbedtls_x509_buf *name,
3091 const char *cn, size_t cn_len )
3092 {
3093 /* try exact match */
3094 if( name->len == cn_len &&
3095 x509_memcasecmp( cn, name->p, cn_len ) == 0 )
3096 {
3097 return( 0 );
3098 }
3099
3100 /* try wildcard match */
3101 if( x509_check_wildcard( cn, name ) == 0 )
3102 {
3103 return( 0 );
3104 }
3105
3106 return( -1 );
3107 }
3108
3109 /*
3110 * Check for SAN match, see RFC 5280 Section 4.2.1.6
3111 */
x509_crt_check_san(const mbedtls_x509_buf * name,const char * cn,size_t cn_len)3112 static int x509_crt_check_san( const mbedtls_x509_buf *name,
3113 const char *cn, size_t cn_len )
3114 {
3115 const unsigned char san_type = (unsigned char) name->tag &
3116 MBEDTLS_ASN1_TAG_VALUE_MASK;
3117
3118 /* dNSName */
3119 if( san_type == MBEDTLS_X509_SAN_DNS_NAME )
3120 return( x509_crt_check_cn( name, cn, cn_len ) );
3121
3122 /* (We may handle other types here later.) */
3123
3124 /* Unrecognized type */
3125 return( -1 );
3126 }
3127
3128 #if defined(VENDOR_ONT_CHECK_CERT_CN_NAME_C)
3129 /*****************************************************************************
3130 * @brief 定制，ONT产品特殊处理，用于校验证书的CN名
3131 * mbedtls默认只校验证书CN，如果不对，则返回错误。
3132 * ONT定制情况下，另外再校验name
3133 * @param crt 证书
3134 * @param cn CN名
3135 * @param flags 输出校验标志
3136 ******************************************************************************/
x509_crt_verify_name(const mbedtls_x509_crt * crt,const char * cn,uint32_t * flags)3137 static void x509_crt_verify_name( const mbedtls_x509_crt *crt,
3138 const char *cn,
3139 uint32_t *flags )
3140 {
3141 const mbedtls_x509_name *name;
3142 const mbedtls_x509_sequence *cur = NULL;
3143 size_t cn_len = strlen( cn );
3144
3145 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
3146 {
3147 for( cur = &crt->subject_alt_names; cur != NULL; cur = cur->next )
3148 {
3149 if( x509_crt_check_san( &cur->buf, cn, cn_len ) == 0 )
3150 break;
3151 }
3152 }
3153
3154 for( name = &crt->subject; name != NULL; name = name->next )
3155 {
3156 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 &&
3157 x509_crt_check_cn( &name->val, cn, cn_len ) == 0 )
3158 {
3159 break;
3160 }
3161 }
3162
3163 if( name == NULL && cur == NULL )
3164 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
3165 }
3166 #else
3167 /*
3168 * Verify the requested CN - only call this if cn is not NULL!
3169 */
x509_crt_verify_name(const mbedtls_x509_crt * crt,const char * cn,uint32_t * flags)3170 static void x509_crt_verify_name( const mbedtls_x509_crt *crt,
3171 const char *cn,
3172 uint32_t *flags )
3173 {
3174 const mbedtls_x509_name *name;
3175 const mbedtls_x509_sequence *cur;
3176 size_t cn_len = strlen( cn );
3177
3178 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
3179 {
3180 for( cur = &crt->subject_alt_names; cur != NULL; cur = cur->next )
3181 {
3182 if( x509_crt_check_san( &cur->buf, cn, cn_len ) == 0 )
3183 break;
3184 }
3185
3186 if( cur == NULL )
3187 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
3188 }
3189 else
3190 {
3191 for( name = &crt->subject; name != NULL; name = name->next )
3192 {
3193 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 &&
3194 x509_crt_check_cn( &name->val, cn, cn_len ) == 0 )
3195 {
3196 break;
3197 }
3198 }
3199
3200 if( name == NULL )
3201 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
3202 }
3203 }
3204 #endif
3205
3206 /*
3207 * Merge the flags for all certs in the chain, after calling callback
3208 */
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)3209 static int x509_crt_merge_flags_with_cb(
3210 uint32_t *flags,
3211 const mbedtls_x509_crt_verify_chain *ver_chain,
3212 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3213 void *p_vrfy )
3214 {
3215 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
3216 unsigned i;
3217 uint32_t cur_flags;
3218 const mbedtls_x509_crt_verify_chain_item *cur;
3219
3220 for( i = ver_chain->len; i != 0; --i )
3221 {
3222 cur = &ver_chain->items[i-1];
3223 cur_flags = cur->flags;
3224
3225 if( NULL != f_vrfy )
3226 if( ( ret = f_vrfy( p_vrfy, cur->crt, (int) i-1, &cur_flags ) ) != 0 )
3227 return( ret );
3228
3229 *flags |= cur_flags;
3230 }
3231
3232 return( 0 );
3233 }
3234
3235 /*
3236 * Verify the certificate validity, with profile, restartable version
3237 *
3238 * This function:
3239 * - checks the requested CN (if any)
3240 * - checks the type and size of the EE cert's key,
3241 * as that isn't done as part of chain building/verification currently
3242 * - builds and verifies the chain
3243 * - then calls the callback and merges the flags
3244 *
3245 * The parameters pairs `trust_ca`, `ca_crl` and `f_ca_cb`, `p_ca_cb`
3246 * are mutually exclusive: If `f_ca_cb != NULL`, it will be used by the
3247 * verification routine to search for trusted signers, and CRLs will
3248 * be disabled. Otherwise, `trust_ca` will be used as the static list
3249 * of trusted signers, and `ca_crl` will be use as the static list
3250 * of CRLs.
3251 */
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)3252 static int x509_crt_verify_restartable_ca_cb( mbedtls_x509_crt *crt,
3253 mbedtls_x509_crt *trust_ca,
3254 mbedtls_x509_crl *ca_crl,
3255 mbedtls_x509_crt_ca_cb_t f_ca_cb,
3256 void *p_ca_cb,
3257 const mbedtls_x509_crt_profile *profile,
3258 const char *cn, uint32_t *flags,
3259 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3260 void *p_vrfy,
3261 mbedtls_x509_crt_restart_ctx *rs_ctx )
3262 {
3263 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
3264 mbedtls_pk_type_t pk_type;
3265 mbedtls_x509_crt_verify_chain ver_chain;
3266 uint32_t ee_flags;
3267
3268 *flags = 0;
3269 ee_flags = 0;
3270 x509_crt_verify_chain_reset( &ver_chain );
3271
3272 if( profile == NULL )
3273 {
3274 ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA;
3275 goto exit;
3276 }
3277
3278 /* check name if requested */
3279 if( cn != NULL )
3280 x509_crt_verify_name( crt, cn, &ee_flags );
3281
3282 /* Check the type and size of the key */
3283 pk_type = mbedtls_pk_get_type( &crt->pk );
3284
3285 if( x509_profile_check_pk_alg( profile, pk_type ) != 0 )
3286 ee_flags |= MBEDTLS_X509_BADCERT_BAD_PK;
3287
3288 if( x509_profile_check_key( profile, &crt->pk ) != 0 )
3289 ee_flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
3290
3291 /* Check the chain */
3292 ret = x509_crt_verify_chain( crt, trust_ca, ca_crl,
3293 f_ca_cb, p_ca_cb, profile,
3294 &ver_chain, rs_ctx );
3295
3296 if( ret != 0 )
3297 goto exit;
3298
3299 /* Merge end-entity flags */
3300 ver_chain.items[0].flags |= ee_flags;
3301
3302 /* Build final flags, calling callback on the way if any */
3303 ret = x509_crt_merge_flags_with_cb( flags, &ver_chain, f_vrfy, p_vrfy );
3304
3305 exit:
3306
3307 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
3308 mbedtls_x509_crt_free( ver_chain.trust_ca_cb_result );
3309 mbedtls_free( ver_chain.trust_ca_cb_result );
3310 ver_chain.trust_ca_cb_result = NULL;
3311 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
3312
3313 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
3314 if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
3315 mbedtls_x509_crt_restart_free( rs_ctx );
3316 #endif
3317
3318 /* prevent misuse of the vrfy callback - VERIFY_FAILED would be ignored by
3319 * the SSL module for authmode optional, but non-zero return from the
3320 * callback means a fatal error so it shouldn't be ignored */
3321 if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
3322 ret = MBEDTLS_ERR_X509_FATAL_ERROR;
3323
3324 if( ret != 0 )
3325 {
3326 *flags = (uint32_t) -1;
3327 return( ret );
3328 }
3329
3330 if( *flags != 0 )
3331 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED );
3332
3333 return( 0 );
3334 }
3335
3336
3337 /*
3338 * Verify the certificate validity (default profile, not restartable)
3339 */
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)3340 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
3341 mbedtls_x509_crt *trust_ca,
3342 mbedtls_x509_crl *ca_crl,
3343 const char *cn, uint32_t *flags,
3344 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3345 void *p_vrfy )
3346 {
3347 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3348 NULL, NULL,
3349 &mbedtls_x509_crt_profile_default,
3350 cn, flags,
3351 f_vrfy, p_vrfy, NULL ) );
3352 }
3353
3354 /*
3355 * Verify the certificate validity (user-chosen profile, not restartable)
3356 */
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)3357 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
3358 mbedtls_x509_crt *trust_ca,
3359 mbedtls_x509_crl *ca_crl,
3360 const mbedtls_x509_crt_profile *profile,
3361 const char *cn, uint32_t *flags,
3362 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3363 void *p_vrfy )
3364 {
3365 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3366 NULL, NULL,
3367 profile, cn, flags,
3368 f_vrfy, p_vrfy, NULL ) );
3369 }
3370
3371 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
3372 /*
3373 * Verify the certificate validity (user-chosen profile, CA callback,
3374 * not restartable).
3375 */
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)3376 int mbedtls_x509_crt_verify_with_ca_cb( mbedtls_x509_crt *crt,
3377 mbedtls_x509_crt_ca_cb_t f_ca_cb,
3378 void *p_ca_cb,
3379 const mbedtls_x509_crt_profile *profile,
3380 const char *cn, uint32_t *flags,
3381 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3382 void *p_vrfy )
3383 {
3384 return( x509_crt_verify_restartable_ca_cb( crt, NULL, NULL,
3385 f_ca_cb, p_ca_cb,
3386 profile, cn, flags,
3387 f_vrfy, p_vrfy, NULL ) );
3388 }
3389 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
3390
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)3391 int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt,
3392 mbedtls_x509_crt *trust_ca,
3393 mbedtls_x509_crl *ca_crl,
3394 const mbedtls_x509_crt_profile *profile,
3395 const char *cn, uint32_t *flags,
3396 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3397 void *p_vrfy,
3398 mbedtls_x509_crt_restart_ctx *rs_ctx )
3399 {
3400 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3401 NULL, NULL,
3402 profile, cn, flags,
3403 f_vrfy, p_vrfy, rs_ctx ) );
3404 }
3405
3406
3407 /*
3408 * Initialize a certificate chain
3409 */
mbedtls_x509_crt_init(mbedtls_x509_crt * crt)3410 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt )
3411 {
3412 memset( crt, 0, sizeof(mbedtls_x509_crt) );
3413 }
3414
3415 /*
3416 * Unallocate all certificate data
3417 */
mbedtls_x509_crt_free(mbedtls_x509_crt * crt)3418 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt )
3419 {
3420 mbedtls_x509_crt *cert_cur = crt;
3421 mbedtls_x509_crt *cert_prv;
3422 mbedtls_x509_name *name_cur;
3423 mbedtls_x509_name *name_prv;
3424 mbedtls_x509_sequence *seq_cur;
3425 mbedtls_x509_sequence *seq_prv;
3426
3427 if( crt == NULL )
3428 return;
3429
3430 do
3431 {
3432 mbedtls_pk_free( &cert_cur->pk );
3433
3434 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
3435 mbedtls_free( cert_cur->sig_opts );
3436 #endif
3437
3438 name_cur = cert_cur->issuer.next;
3439 while( name_cur != NULL )
3440 {
3441 name_prv = name_cur;
3442 name_cur = name_cur->next;
3443 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
3444 mbedtls_free( name_prv );
3445 }
3446
3447 name_cur = cert_cur->subject.next;
3448 while( name_cur != NULL )
3449 {
3450 name_prv = name_cur;
3451 name_cur = name_cur->next;
3452 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
3453 mbedtls_free( name_prv );
3454 }
3455
3456 seq_cur = cert_cur->ext_key_usage.next;
3457 while( seq_cur != NULL )
3458 {
3459 seq_prv = seq_cur;
3460 seq_cur = seq_cur->next;
3461 mbedtls_platform_zeroize( seq_prv,
3462 sizeof( mbedtls_x509_sequence ) );
3463 mbedtls_free( seq_prv );
3464 }
3465
3466 seq_cur = cert_cur->subject_alt_names.next;
3467 while( seq_cur != NULL )
3468 {
3469 seq_prv = seq_cur;
3470 seq_cur = seq_cur->next;
3471 mbedtls_platform_zeroize( seq_prv,
3472 sizeof( mbedtls_x509_sequence ) );
3473 mbedtls_free( seq_prv );
3474 }
3475
3476 seq_cur = cert_cur->certificate_policies.next;
3477 while( seq_cur != NULL )
3478 {
3479 seq_prv = seq_cur;
3480 seq_cur = seq_cur->next;
3481 mbedtls_platform_zeroize( seq_prv,
3482 sizeof( mbedtls_x509_sequence ) );
3483 mbedtls_free( seq_prv );
3484 }
3485
3486 if( cert_cur->raw.p != NULL && cert_cur->own_buffer )
3487 {
3488 mbedtls_platform_zeroize( cert_cur->raw.p, cert_cur->raw.len );
3489 mbedtls_free( cert_cur->raw.p );
3490 }
3491
3492 cert_cur = cert_cur->next;
3493 }
3494 while( cert_cur != NULL );
3495
3496 cert_cur = crt;
3497 do
3498 {
3499 cert_prv = cert_cur;
3500 cert_cur = cert_cur->next;
3501
3502 mbedtls_platform_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) );
3503 if( cert_prv != crt )
3504 mbedtls_free( cert_prv );
3505 }
3506 while( cert_cur != NULL );
3507 }
3508
3509 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
3510 /*
3511 * Initialize a restart context
3512 */
mbedtls_x509_crt_restart_init(mbedtls_x509_crt_restart_ctx * ctx)3513 void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx )
3514 {
3515 mbedtls_pk_restart_init( &ctx->pk );
3516
3517 ctx->parent = NULL;
3518 ctx->fallback_parent = NULL;
3519 ctx->fallback_signature_is_good = 0;
3520
3521 ctx->parent_is_trusted = -1;
3522
3523 ctx->in_progress = x509_crt_rs_none;
3524 ctx->self_cnt = 0;
3525 x509_crt_verify_chain_reset( &ctx->ver_chain );
3526 }
3527
3528 /*
3529 * Free the components of a restart context
3530 */
mbedtls_x509_crt_restart_free(mbedtls_x509_crt_restart_ctx * ctx)3531 void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx )
3532 {
3533 if( ctx == NULL )
3534 return;
3535
3536 mbedtls_pk_restart_free( &ctx->pk );
3537 mbedtls_x509_crt_restart_init( ctx );
3538 }
3539 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
3540
3541 #endif /* MBEDTLS_X509_CRT_PARSE_C */
3542