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(MBEDTLS_HAVE_TIME)
67 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
68 #include <windows.h>
69 #else
70 #include <time.h>
71 #endif
72 #endif
73
74 #if defined(MBEDTLS_FS_IO)
75 #include <stdio.h>
76 #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32)
77 #include <sys/types.h>
78 #include <sys/stat.h>
79 #include <dirent.h>
80 #endif /* !_WIN32 || EFIX64 || EFI32 */
81 #endif
82
83 /*
84 * Item in a verification chain: cert and flags for it
85 */
86 typedef struct {
87 mbedtls_x509_crt *crt;
88 uint32_t flags;
89 } x509_crt_verify_chain_item;
90
91 /*
92 * Max size of verification chain: end-entity + intermediates + trusted root
93 */
94 #define X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 )
95
96 /* Default profile. Do not remove items unless there are serious security
97 * concerns. */
98 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default =
99 {
100 /* Only SHA-2 hashes */
101 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) |
102 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
103 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
104 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
105 0xFFFFFFF, /* Any PK alg */
106 0xFFFFFFF, /* Any curve */
107 2048,
108 };
109
110 /*
111 * Next-default profile
112 */
113 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next =
114 {
115 /* Hashes from SHA-256 and above */
116 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
117 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
118 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
119 0xFFFFFFF, /* Any PK alg */
120 #if defined(MBEDTLS_ECP_C)
121 /* Curves at or above 128-bit security level */
122 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
123 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
124 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |
125 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
126 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
127 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
128 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ),
129 #else
130 0,
131 #endif
132 2048,
133 };
134
135 /*
136 * NSA Suite B Profile
137 */
138 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb =
139 {
140 /* Only SHA-256 and 384 */
141 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
142 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ),
143 /* Only ECDSA */
144 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ) |
145 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECKEY ),
146 #if defined(MBEDTLS_ECP_C)
147 /* Only NIST P-256 and P-384 */
148 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
149 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ),
150 #else
151 0,
152 #endif
153 0,
154 };
155
156 /*
157 * Check md_alg against profile
158 * Return 0 if md_alg is acceptable for this profile, -1 otherwise
159 */
x509_profile_check_md_alg(const mbedtls_x509_crt_profile * profile,mbedtls_md_type_t md_alg)160 static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile,
161 mbedtls_md_type_t md_alg )
162 {
163 if( md_alg == MBEDTLS_MD_NONE )
164 return( -1 );
165
166 if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 )
167 return( 0 );
168
169 return( -1 );
170 }
171
172 /*
173 * Check pk_alg against profile
174 * Return 0 if pk_alg is acceptable for this profile, -1 otherwise
175 */
x509_profile_check_pk_alg(const mbedtls_x509_crt_profile * profile,mbedtls_pk_type_t pk_alg)176 static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile,
177 mbedtls_pk_type_t pk_alg )
178 {
179 if( pk_alg == MBEDTLS_PK_NONE )
180 return( -1 );
181
182 if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 )
183 return( 0 );
184
185 return( -1 );
186 }
187
188 /*
189 * Check key against profile
190 * Return 0 if pk is acceptable for this profile, -1 otherwise
191 */
x509_profile_check_key(const mbedtls_x509_crt_profile * profile,const mbedtls_pk_context * pk)192 static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile,
193 const mbedtls_pk_context *pk )
194 {
195 const mbedtls_pk_type_t pk_alg = mbedtls_pk_get_type( pk );
196
197 #if defined(MBEDTLS_RSA_C)
198 if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS )
199 {
200 if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen )
201 return( 0 );
202
203 return( -1 );
204 }
205 #endif
206
207 #if defined(MBEDTLS_ECP_C)
208 if( pk_alg == MBEDTLS_PK_ECDSA ||
209 pk_alg == MBEDTLS_PK_ECKEY ||
210 pk_alg == MBEDTLS_PK_ECKEY_DH )
211 {
212 const mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id;
213
214 if( gid == MBEDTLS_ECP_DP_NONE )
215 return( -1 );
216
217 if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 )
218 return( 0 );
219
220 return( -1 );
221 }
222 #endif
223
224 return( -1 );
225 }
226
227 /*
228 * Like memcmp, but case-insensitive and always returns -1 if different
229 */
x509_memcasecmp(const void * s1,const void * s2,size_t len)230 static int x509_memcasecmp( const void *s1, const void *s2, size_t len )
231 {
232 size_t i;
233 unsigned char diff;
234 const unsigned char *n1 = s1, *n2 = s2;
235
236 for( i = 0; i < len; i++ )
237 {
238 diff = n1[i] ^ n2[i];
239
240 if( diff == 0 )
241 continue;
242
243 if( diff == 32 &&
244 ( ( n1[i] >= 'a' && n1[i] <= 'z' ) ||
245 ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) )
246 {
247 continue;
248 }
249
250 return( -1 );
251 }
252
253 return( 0 );
254 }
255
256 /*
257 * Return 0 if name matches wildcard, -1 otherwise
258 */
x509_check_wildcard(const char * cn,const mbedtls_x509_buf * name)259 static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name )
260 {
261 size_t i;
262 size_t cn_idx = 0, cn_len = strlen( cn );
263
264 /* We can't have a match if there is no wildcard to match */
265 if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' )
266 return( -1 );
267
268 for( i = 0; i < cn_len; ++i )
269 {
270 if( cn[i] == '.' )
271 {
272 cn_idx = i;
273 break;
274 }
275 }
276
277 if( cn_idx == 0 )
278 return( -1 );
279
280 if( cn_len - cn_idx == name->len - 1 &&
281 x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
282 {
283 return( 0 );
284 }
285
286 return( -1 );
287 }
288
289 /*
290 * Compare two X.509 strings, case-insensitive, and allowing for some encoding
291 * variations (but not all).
292 *
293 * Return 0 if equal, -1 otherwise.
294 */
x509_string_cmp(const mbedtls_x509_buf * a,const mbedtls_x509_buf * b)295 static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b )
296 {
297 if( a->tag == b->tag &&
298 a->len == b->len &&
299 memcmp( a->p, b->p, b->len ) == 0 )
300 {
301 return( 0 );
302 }
303
304 if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
305 ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
306 a->len == b->len &&
307 x509_memcasecmp( a->p, b->p, b->len ) == 0 )
308 {
309 return( 0 );
310 }
311
312 return( -1 );
313 }
314
315 /*
316 * Compare two X.509 Names (aka rdnSequence).
317 *
318 * See RFC 5280 section 7.1, though we don't implement the whole algorithm:
319 * we sometimes return unequal when the full algorithm would return equal,
320 * but never the other way. (In particular, we don't do Unicode normalisation
321 * or space folding.)
322 *
323 * Return 0 if equal, -1 otherwise.
324 */
x509_name_cmp(const mbedtls_x509_name * a,const mbedtls_x509_name * b)325 static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b )
326 {
327 /* Avoid recursion, it might not be optimised by the compiler */
328 while( a != NULL || b != NULL )
329 {
330 if( a == NULL || b == NULL )
331 return( -1 );
332
333 /* type */
334 if( a->oid.tag != b->oid.tag ||
335 a->oid.len != b->oid.len ||
336 memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 )
337 {
338 return( -1 );
339 }
340
341 /* value */
342 if( x509_string_cmp( &a->val, &b->val ) != 0 )
343 return( -1 );
344
345 /* structure of the list of sets */
346 if( a->next_merged != b->next_merged )
347 return( -1 );
348
349 a = a->next;
350 b = b->next;
351 }
352
353 /* a == NULL == b */
354 return( 0 );
355 }
356
357 /*
358 * Reset (init or clear) a verify_chain
359 */
x509_crt_verify_chain_reset(mbedtls_x509_crt_verify_chain * ver_chain)360 static void x509_crt_verify_chain_reset(
361 mbedtls_x509_crt_verify_chain *ver_chain )
362 {
363 size_t i;
364
365 for( i = 0; i < MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE; i++ )
366 {
367 ver_chain->items[i].crt = NULL;
368 ver_chain->items[i].flags = (uint32_t) -1;
369 }
370
371 ver_chain->len = 0;
372
373 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
374 ver_chain->trust_ca_cb_result = NULL;
375 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
376 }
377
378 /*
379 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
380 */
x509_get_version(unsigned char ** p,const unsigned char * end,int * ver)381 static int x509_get_version( unsigned char **p,
382 const unsigned char *end,
383 int *ver )
384 {
385 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
386 size_t len;
387
388 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
389 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 )
390 {
391 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
392 {
393 *ver = 0;
394 return( 0 );
395 }
396
397 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
398 }
399
400 end = *p + len;
401
402 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
403 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION, ret ) );
404
405 if( *p != end )
406 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_VERSION,
407 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
408
409 return( 0 );
410 }
411
412 /*
413 * Validity ::= SEQUENCE {
414 * notBefore Time,
415 * notAfter Time }
416 */
x509_get_dates(unsigned char ** p,const unsigned char * end,mbedtls_x509_time * from,mbedtls_x509_time * to)417 static int x509_get_dates( unsigned char **p,
418 const unsigned char *end,
419 mbedtls_x509_time *from,
420 mbedtls_x509_time *to )
421 {
422 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
423 size_t len;
424
425 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
426 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
427 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE, ret ) );
428
429 end = *p + len;
430
431 if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 )
432 return( ret );
433
434 if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 )
435 return( ret );
436
437 if( *p != end )
438 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_DATE,
439 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
440
441 return( 0 );
442 }
443
444 /*
445 * X.509 v2/v3 unique identifier (not parsed)
446 */
x509_get_uid(unsigned char ** p,const unsigned char * end,mbedtls_x509_buf * uid,int n)447 static int x509_get_uid( unsigned char **p,
448 const unsigned char *end,
449 mbedtls_x509_buf *uid, int n )
450 {
451 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
452
453 if( *p == end )
454 return( 0 );
455
456 uid->tag = **p;
457
458 if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len,
459 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 )
460 {
461 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
462 return( 0 );
463
464 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
465 }
466
467 uid->p = *p;
468 *p += uid->len;
469
470 return( 0 );
471 }
472
x509_get_basic_constraints(unsigned char ** p,const unsigned char * end,int * ca_istrue,int * max_pathlen)473 static int x509_get_basic_constraints( unsigned char **p,
474 const unsigned char *end,
475 int *ca_istrue,
476 int *max_pathlen )
477 {
478 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
479 size_t len;
480
481 /*
482 * BasicConstraints ::= SEQUENCE {
483 * cA BOOLEAN DEFAULT FALSE,
484 * pathLenConstraint INTEGER (0..MAX) OPTIONAL }
485 */
486 *ca_istrue = 0; /* DEFAULT FALSE */
487 *max_pathlen = 0; /* endless */
488
489 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
490 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
491 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
492
493 if( *p == end )
494 return( 0 );
495
496 if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 )
497 {
498 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
499 ret = mbedtls_asn1_get_int( p, end, ca_istrue );
500
501 if( ret != 0 )
502 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
503
504 if( *ca_istrue != 0 )
505 *ca_istrue = 1;
506 }
507
508 if( *p == end )
509 return( 0 );
510
511 if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 )
512 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
513
514 if( *p != end )
515 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
516 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
517
518 /* Do not accept max_pathlen equal to INT_MAX to avoid a signed integer
519 * overflow, which is an undefined behavior. */
520 if( *max_pathlen == INT_MAX )
521 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
522 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
523
524 (*max_pathlen)++;
525
526 return( 0 );
527 }
528
x509_get_ns_cert_type(unsigned char ** p,const unsigned char * end,unsigned char * ns_cert_type)529 static int x509_get_ns_cert_type( unsigned char **p,
530 const unsigned char *end,
531 unsigned char *ns_cert_type)
532 {
533 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
534 mbedtls_x509_bitstring bs = { 0, 0, NULL };
535
536 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
537 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
538
539 if( bs.len != 1 )
540 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
541 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
542
543 /* Get actual bitstring */
544 *ns_cert_type = *bs.p;
545 return( 0 );
546 }
547
x509_get_key_usage(unsigned char ** p,const unsigned char * end,unsigned int * key_usage)548 static int x509_get_key_usage( unsigned char **p,
549 const unsigned char *end,
550 unsigned int *key_usage)
551 {
552 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
553 size_t i;
554 mbedtls_x509_bitstring bs = { 0, 0, NULL };
555
556 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
557 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
558
559 if( bs.len < 1 )
560 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
561 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
562
563 /* Get actual bitstring */
564 *key_usage = 0;
565 for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ )
566 {
567 *key_usage |= (unsigned int) bs.p[i] << (8*i);
568 }
569
570 return( 0 );
571 }
572
573 /*
574 * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
575 *
576 * KeyPurposeId ::= OBJECT IDENTIFIER
577 */
x509_get_ext_key_usage(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * ext_key_usage)578 static int x509_get_ext_key_usage( unsigned char **p,
579 const unsigned char *end,
580 mbedtls_x509_sequence *ext_key_usage)
581 {
582 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
583
584 if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 )
585 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
586
587 /* Sequence length must be >= 1 */
588 if( ext_key_usage->buf.p == NULL )
589 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
590 MBEDTLS_ERR_ASN1_INVALID_LENGTH ) );
591
592 return( 0 );
593 }
594
595 /*
596 * SubjectAltName ::= GeneralNames
597 *
598 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
599 *
600 * GeneralName ::= CHOICE {
601 * otherName [0] OtherName,
602 * rfc822Name [1] IA5String,
603 * dNSName [2] IA5String,
604 * x400Address [3] ORAddress,
605 * directoryName [4] Name,
606 * ediPartyName [5] EDIPartyName,
607 * uniformResourceIdentifier [6] IA5String,
608 * iPAddress [7] OCTET STRING,
609 * registeredID [8] OBJECT IDENTIFIER }
610 *
611 * OtherName ::= SEQUENCE {
612 * type-id OBJECT IDENTIFIER,
613 * value [0] EXPLICIT ANY DEFINED BY type-id }
614 *
615 * EDIPartyName ::= SEQUENCE {
616 * nameAssigner [0] DirectoryString OPTIONAL,
617 * partyName [1] DirectoryString }
618 *
619 * NOTE: we list all types, but only use dNSName and otherName
620 * of type HwModuleName, as defined in RFC 4108, at this point.
621 */
x509_get_subject_alt_name(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * subject_alt_name)622 static int x509_get_subject_alt_name( unsigned char **p,
623 const unsigned char *end,
624 mbedtls_x509_sequence *subject_alt_name )
625 {
626 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
627 size_t len, tag_len;
628 mbedtls_asn1_buf *buf;
629 unsigned char tag;
630 mbedtls_asn1_sequence *cur = subject_alt_name;
631
632 /* Get main sequence tag */
633 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
634 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
635 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
636
637 if( *p + len != end )
638 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
639 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
640
641 while( *p < end )
642 {
643 mbedtls_x509_subject_alternative_name dummy_san_buf;
644 memset( &dummy_san_buf, 0, sizeof( dummy_san_buf ) );
645
646 tag = **p;
647 (*p)++;
648 if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 )
649 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
650
651 if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) !=
652 MBEDTLS_ASN1_CONTEXT_SPECIFIC )
653 {
654 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
655 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) );
656 }
657
658 /*
659 * Check that the SAN is structured correctly.
660 */
661 ret = mbedtls_x509_parse_subject_alt_name( &(cur->buf), &dummy_san_buf );
662 /*
663 * In case the extension is malformed, return an error,
664 * and clear the allocated sequences.
665 */
666 if( ret != 0 && ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
667 {
668 mbedtls_x509_sequence *seq_cur = subject_alt_name->next;
669 mbedtls_x509_sequence *seq_prv;
670 while( seq_cur != NULL )
671 {
672 seq_prv = seq_cur;
673 seq_cur = seq_cur->next;
674 mbedtls_platform_zeroize( seq_prv,
675 sizeof( mbedtls_x509_sequence ) );
676 mbedtls_free( seq_prv );
677 }
678 subject_alt_name->next = NULL;
679 return( ret );
680 }
681
682 /* Allocate and assign next pointer */
683 if( cur->buf.p != NULL )
684 {
685 if( cur->next != NULL )
686 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
687
688 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
689
690 if( cur->next == NULL )
691 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
692 MBEDTLS_ERR_ASN1_ALLOC_FAILED ) );
693
694 cur = cur->next;
695 }
696
697 buf = &(cur->buf);
698 buf->tag = tag;
699 buf->p = *p;
700 buf->len = tag_len;
701 *p += buf->len;
702 }
703
704 /* Set final sequence entry's next pointer to NULL */
705 cur->next = NULL;
706
707 if( *p != end )
708 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
709 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
710
711 return( 0 );
712 }
713
714 /*
715 * id-ce-certificatePolicies OBJECT IDENTIFIER ::= { id-ce 32 }
716 *
717 * anyPolicy OBJECT IDENTIFIER ::= { id-ce-certificatePolicies 0 }
718 *
719 * certificatePolicies ::= SEQUENCE SIZE (1..MAX) OF PolicyInformation
720 *
721 * PolicyInformation ::= SEQUENCE {
722 * policyIdentifier CertPolicyId,
723 * policyQualifiers SEQUENCE SIZE (1..MAX) OF
724 * PolicyQualifierInfo OPTIONAL }
725 *
726 * CertPolicyId ::= OBJECT IDENTIFIER
727 *
728 * PolicyQualifierInfo ::= SEQUENCE {
729 * policyQualifierId PolicyQualifierId,
730 * qualifier ANY DEFINED BY policyQualifierId }
731 *
732 * -- policyQualifierIds for Internet policy qualifiers
733 *
734 * id-qt OBJECT IDENTIFIER ::= { id-pkix 2 }
735 * id-qt-cps OBJECT IDENTIFIER ::= { id-qt 1 }
736 * id-qt-unotice OBJECT IDENTIFIER ::= { id-qt 2 }
737 *
738 * PolicyQualifierId ::= OBJECT IDENTIFIER ( id-qt-cps | id-qt-unotice )
739 *
740 * Qualifier ::= CHOICE {
741 * cPSuri CPSuri,
742 * userNotice UserNotice }
743 *
744 * CPSuri ::= IA5String
745 *
746 * UserNotice ::= SEQUENCE {
747 * noticeRef NoticeReference OPTIONAL,
748 * explicitText DisplayText OPTIONAL }
749 *
750 * NoticeReference ::= SEQUENCE {
751 * organization DisplayText,
752 * noticeNumbers SEQUENCE OF INTEGER }
753 *
754 * DisplayText ::= CHOICE {
755 * ia5String IA5String (SIZE (1..200)),
756 * visibleString VisibleString (SIZE (1..200)),
757 * bmpString BMPString (SIZE (1..200)),
758 * utf8String UTF8String (SIZE (1..200)) }
759 *
760 * NOTE: we only parse and use anyPolicy without qualifiers at this point
761 * as defined in RFC 5280.
762 */
x509_get_certificate_policies(unsigned char ** p,const unsigned char * end,mbedtls_x509_sequence * certificate_policies)763 static int x509_get_certificate_policies( unsigned char **p,
764 const unsigned char *end,
765 mbedtls_x509_sequence *certificate_policies )
766 {
767 int ret, parse_ret = 0;
768 size_t len;
769 mbedtls_asn1_buf *buf;
770 mbedtls_asn1_sequence *cur = certificate_policies;
771
772 /* Get main sequence tag */
773 ret = mbedtls_asn1_get_tag( p, end, &len,
774 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE );
775 if( ret != 0 )
776 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
777
778 if( *p + len != end )
779 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
780 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
781
782 /*
783 * Cannot be an empty sequence.
784 */
785 if( len == 0 )
786 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
787 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
788
789 while( *p < end )
790 {
791 mbedtls_x509_buf policy_oid;
792 const unsigned char *policy_end;
793
794 /*
795 * Get the policy sequence
796 */
797 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
798 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
799 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
800
801 policy_end = *p + len;
802
803 if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
804 MBEDTLS_ASN1_OID ) ) != 0 )
805 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
806
807 policy_oid.tag = MBEDTLS_ASN1_OID;
808 policy_oid.len = len;
809 policy_oid.p = *p;
810
811 /*
812 * Only AnyPolicy is currently supported when enforcing policy.
813 */
814 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_POLICY, &policy_oid ) != 0 )
815 {
816 /*
817 * Set the parsing return code but continue parsing, in case this
818 * extension is critical and MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION
819 * is configured.
820 */
821 parse_ret = MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE;
822 }
823
824 /* Allocate and assign next pointer */
825 if( cur->buf.p != NULL )
826 {
827 if( cur->next != NULL )
828 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
829
830 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
831
832 if( cur->next == NULL )
833 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
834 MBEDTLS_ERR_ASN1_ALLOC_FAILED ) );
835
836 cur = cur->next;
837 }
838
839 buf = &( cur->buf );
840 buf->tag = policy_oid.tag;
841 buf->p = policy_oid.p;
842 buf->len = policy_oid.len;
843
844 *p += len;
845
846 /*
847 * If there is an optional qualifier, then *p < policy_end
848 * Check the Qualifier len to verify it doesn't exceed policy_end.
849 */
850 if( *p < policy_end )
851 {
852 if( ( ret = mbedtls_asn1_get_tag( p, policy_end, &len,
853 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
854 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
855 /*
856 * Skip the optional policy qualifiers.
857 */
858 *p += len;
859 }
860
861 if( *p != policy_end )
862 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
863 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
864 }
865
866 /* Set final sequence entry's next pointer to NULL */
867 cur->next = NULL;
868
869 if( *p != end )
870 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
871 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
872
873 return( parse_ret );
874 }
875
876 /*
877 * X.509 v3 extensions
878 *
879 */
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)880 static int x509_get_crt_ext( unsigned char **p,
881 const unsigned char *end,
882 mbedtls_x509_crt *crt,
883 mbedtls_x509_crt_ext_cb_t cb,
884 void *p_ctx )
885 {
886 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
887 size_t len;
888 unsigned char *end_ext_data, *start_ext_octet, *end_ext_octet;
889
890 if( *p == end )
891 return( 0 );
892
893 if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 )
894 return( ret );
895
896 end = crt->v3_ext.p + crt->v3_ext.len;
897 while( *p < end )
898 {
899 /*
900 * Extension ::= SEQUENCE {
901 * extnID OBJECT IDENTIFIER,
902 * critical BOOLEAN DEFAULT FALSE,
903 * extnValue OCTET STRING }
904 */
905 mbedtls_x509_buf extn_oid = {0, 0, NULL};
906 int is_critical = 0; /* DEFAULT FALSE */
907 int ext_type = 0;
908
909 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
910 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
911 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
912
913 end_ext_data = *p + len;
914
915 /* Get extension ID */
916 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len,
917 MBEDTLS_ASN1_OID ) ) != 0 )
918 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
919
920 extn_oid.tag = MBEDTLS_ASN1_OID;
921 extn_oid.p = *p;
922 *p += extn_oid.len;
923
924 /* Get optional critical */
925 if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
926 ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )
927 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
928
929 /* Data should be octet string type */
930 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len,
931 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
932 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
933
934 start_ext_octet = *p;
935 end_ext_octet = *p + len;
936
937 if( end_ext_octet != end_ext_data )
938 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
939 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
940
941 /*
942 * Detect supported extensions
943 */
944 ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type );
945
946 if( ret != 0 )
947 {
948 /* Give the callback (if any) a chance to handle the extension */
949 if( cb != NULL )
950 {
951 ret = cb( p_ctx, crt, &extn_oid, is_critical, *p, end_ext_octet );
952 if( ret != 0 && is_critical )
953 return( ret );
954 *p = end_ext_octet;
955 continue;
956 }
957
958 /* No parser found, skip extension */
959 *p = end_ext_octet;
960
961 #if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
962 if( is_critical )
963 {
964 /* Data is marked as critical: fail */
965 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
966 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) );
967 }
968 #endif
969 continue;
970 }
971
972 /* Forbid repeated extensions */
973 if( ( crt->ext_types & ext_type ) != 0 )
974 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
975
976 crt->ext_types |= ext_type;
977
978 switch( ext_type )
979 {
980 case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS:
981 /* Parse basic constraints */
982 if( ( ret = x509_get_basic_constraints( p, end_ext_octet,
983 &crt->ca_istrue, &crt->max_pathlen ) ) != 0 )
984 return( ret );
985 break;
986
987 case MBEDTLS_X509_EXT_KEY_USAGE:
988 /* Parse key usage */
989 if( ( ret = x509_get_key_usage( p, end_ext_octet,
990 &crt->key_usage ) ) != 0 )
991 return( ret );
992 break;
993
994 case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE:
995 /* Parse extended key usage */
996 if( ( ret = x509_get_ext_key_usage( p, end_ext_octet,
997 &crt->ext_key_usage ) ) != 0 )
998 return( ret );
999 break;
1000
1001 case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
1002 /* Parse subject alt name */
1003 if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
1004 &crt->subject_alt_names ) ) != 0 )
1005 return( ret );
1006 break;
1007
1008 case MBEDTLS_X509_EXT_NS_CERT_TYPE:
1009 /* Parse netscape certificate type */
1010 if( ( ret = x509_get_ns_cert_type( p, end_ext_octet,
1011 &crt->ns_cert_type ) ) != 0 )
1012 return( ret );
1013 break;
1014
1015 case MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES:
1016 /* Parse certificate policies type */
1017 if( ( ret = x509_get_certificate_policies( p, end_ext_octet,
1018 &crt->certificate_policies ) ) != 0 )
1019 {
1020 /* Give the callback (if any) a chance to handle the extension
1021 * if it contains unsupported policies */
1022 if( ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE && cb != NULL &&
1023 cb( p_ctx, crt, &extn_oid, is_critical,
1024 start_ext_octet, end_ext_octet ) == 0 )
1025 break;
1026
1027 #if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
1028 if( is_critical )
1029 return( ret );
1030 else
1031 #endif
1032 /*
1033 * If MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE is returned, then we
1034 * cannot interpret or enforce the policy. However, it is up to
1035 * the user to choose how to enforce the policies,
1036 * unless the extension is critical.
1037 */
1038 if( ret != MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
1039 return( ret );
1040 }
1041 break;
1042
1043 default:
1044 /*
1045 * If this is a non-critical extension, which the oid layer
1046 * supports, but there isn't an x509 parser for it,
1047 * skip the extension.
1048 */
1049 #if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
1050 if( is_critical )
1051 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1052 else
1053 #endif
1054 *p = end_ext_octet;
1055 }
1056 }
1057
1058 if( *p != end )
1059 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1060 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1061
1062 return( 0 );
1063 }
1064
1065 /*
1066 * Parse and fill a single X.509 certificate in DER format
1067 */
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)1068 static int x509_crt_parse_der_core( mbedtls_x509_crt *crt,
1069 const unsigned char *buf,
1070 size_t buflen,
1071 int make_copy,
1072 mbedtls_x509_crt_ext_cb_t cb,
1073 void *p_ctx )
1074 {
1075 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1076 size_t len;
1077 unsigned char *p, *end, *crt_end;
1078 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
1079
1080 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) );
1081 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) );
1082 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) );
1083
1084 /*
1085 * Check for valid input
1086 */
1087 if( crt == NULL || buf == NULL )
1088 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1089
1090 /* Use the original buffer until we figure out actual length. */
1091 p = (unsigned char*) buf;
1092 len = buflen;
1093 end = p + len;
1094
1095 /*
1096 * Certificate ::= SEQUENCE {
1097 * tbsCertificate TBSCertificate,
1098 * signatureAlgorithm AlgorithmIdentifier,
1099 * signatureValue BIT STRING }
1100 */
1101 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1102 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1103 {
1104 mbedtls_x509_crt_free( crt );
1105 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
1106 }
1107
1108 end = crt_end = p + len;
1109 crt->raw.len = crt_end - buf;
1110 if( make_copy != 0 )
1111 {
1112 /* Create and populate a new buffer for the raw field. */
1113 crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len );
1114 if( crt->raw.p == NULL )
1115 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
1116
1117 memcpy( crt->raw.p, buf, crt->raw.len );
1118 crt->own_buffer = 1;
1119
1120 p += crt->raw.len - len;
1121 end = crt_end = p + len;
1122 }
1123 else
1124 {
1125 crt->raw.p = (unsigned char*) buf;
1126 crt->own_buffer = 0;
1127 }
1128
1129 /*
1130 * TBSCertificate ::= SEQUENCE {
1131 */
1132 crt->tbs.p = p;
1133
1134 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1135 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1136 {
1137 mbedtls_x509_crt_free( crt );
1138 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1139 }
1140
1141 end = p + len;
1142 crt->tbs.len = end - crt->tbs.p;
1143
1144 /*
1145 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
1146 *
1147 * CertificateSerialNumber ::= INTEGER
1148 *
1149 * signature AlgorithmIdentifier
1150 */
1151 if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 ||
1152 ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 ||
1153 ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid,
1154 &sig_params1 ) ) != 0 )
1155 {
1156 mbedtls_x509_crt_free( crt );
1157 return( ret );
1158 }
1159
1160 if( crt->version < 0 || crt->version > 2 )
1161 {
1162 mbedtls_x509_crt_free( crt );
1163 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
1164 }
1165
1166 crt->version++;
1167
1168 if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1,
1169 &crt->sig_md, &crt->sig_pk,
1170 &crt->sig_opts ) ) != 0 )
1171 {
1172 mbedtls_x509_crt_free( crt );
1173 return( ret );
1174 }
1175
1176 /*
1177 * issuer Name
1178 */
1179 crt->issuer_raw.p = p;
1180
1181 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1182 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1183 {
1184 mbedtls_x509_crt_free( crt );
1185 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1186 }
1187
1188 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 )
1189 {
1190 mbedtls_x509_crt_free( crt );
1191 return( ret );
1192 }
1193
1194 crt->issuer_raw.len = p - crt->issuer_raw.p;
1195
1196 /*
1197 * Validity ::= SEQUENCE {
1198 * notBefore Time,
1199 * notAfter Time }
1200 *
1201 */
1202 if( ( ret = x509_get_dates( &p, end, &crt->valid_from,
1203 &crt->valid_to ) ) != 0 )
1204 {
1205 mbedtls_x509_crt_free( crt );
1206 return( ret );
1207 }
1208
1209 /*
1210 * subject Name
1211 */
1212 crt->subject_raw.p = p;
1213
1214 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1215 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1216 {
1217 mbedtls_x509_crt_free( crt );
1218 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT, ret ) );
1219 }
1220
1221 if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 )
1222 {
1223 mbedtls_x509_crt_free( crt );
1224 return( ret );
1225 }
1226
1227 crt->subject_raw.len = p - crt->subject_raw.p;
1228
1229 /*
1230 * SubjectPublicKeyInfo
1231 */
1232 crt->pk_raw.p = p;
1233 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 )
1234 {
1235 mbedtls_x509_crt_free( crt );
1236 return( ret );
1237 }
1238 crt->pk_raw.len = p - crt->pk_raw.p;
1239
1240 /*
1241 * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
1242 * -- If present, version shall be v2 or v3
1243 * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
1244 * -- If present, version shall be v2 or v3
1245 * extensions [3] EXPLICIT Extensions OPTIONAL
1246 * -- If present, version shall be v3
1247 */
1248 if( crt->version == 2 || crt->version == 3 )
1249 {
1250 ret = x509_get_uid( &p, end, &crt->issuer_id, 1 );
1251 if( ret != 0 )
1252 {
1253 mbedtls_x509_crt_free( crt );
1254 return( ret );
1255 }
1256 }
1257
1258 if( crt->version == 2 || crt->version == 3 )
1259 {
1260 ret = x509_get_uid( &p, end, &crt->subject_id, 2 );
1261 if( ret != 0 )
1262 {
1263 mbedtls_x509_crt_free( crt );
1264 return( ret );
1265 }
1266 }
1267
1268 #if !defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3)
1269 if( crt->version == 3 )
1270 #endif
1271 {
1272 ret = x509_get_crt_ext( &p, end, crt, cb, p_ctx );
1273 if( ret != 0 )
1274 {
1275 mbedtls_x509_crt_free( crt );
1276 return( ret );
1277 }
1278 }
1279
1280 if( p != end )
1281 {
1282 mbedtls_x509_crt_free( crt );
1283 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT,
1284 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1285 }
1286
1287 end = crt_end;
1288
1289 /*
1290 * }
1291 * -- end of TBSCertificate
1292 *
1293 * signatureAlgorithm AlgorithmIdentifier,
1294 * signatureValue BIT STRING
1295 */
1296 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 )
1297 {
1298 mbedtls_x509_crt_free( crt );
1299 return( ret );
1300 }
1301
1302 if( crt->sig_oid.len != sig_oid2.len ||
1303 memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 ||
1304 sig_params1.tag != sig_params2.tag ||
1305 sig_params1.len != sig_params2.len ||
1306 ( sig_params1.len != 0 &&
1307 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) )
1308 {
1309 mbedtls_x509_crt_free( crt );
1310 return( MBEDTLS_ERR_X509_SIG_MISMATCH );
1311 }
1312
1313 if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 )
1314 {
1315 mbedtls_x509_crt_free( crt );
1316 return( ret );
1317 }
1318
1319 if( p != end )
1320 {
1321 mbedtls_x509_crt_free( crt );
1322 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_FORMAT,
1323 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1324 }
1325
1326 return( 0 );
1327 }
1328
1329 /*
1330 * Parse one X.509 certificate in DER format from a buffer and add them to a
1331 * chained list
1332 */
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)1333 static int mbedtls_x509_crt_parse_der_internal( mbedtls_x509_crt *chain,
1334 const unsigned char *buf,
1335 size_t buflen,
1336 int make_copy,
1337 mbedtls_x509_crt_ext_cb_t cb,
1338 void *p_ctx )
1339 {
1340 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1341 mbedtls_x509_crt *crt = chain, *prev = NULL;
1342
1343 /*
1344 * Check for valid input
1345 */
1346 if( crt == NULL || buf == NULL )
1347 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1348
1349 while( crt->version != 0 && crt->next != NULL )
1350 {
1351 prev = crt;
1352 crt = crt->next;
1353 }
1354
1355 /*
1356 * Add new certificate on the end of the chain if needed.
1357 */
1358 if( crt->version != 0 && crt->next == NULL )
1359 {
1360 crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
1361
1362 if( crt->next == NULL )
1363 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
1364
1365 prev = crt;
1366 mbedtls_x509_crt_init( crt->next );
1367 crt = crt->next;
1368 }
1369
1370 ret = x509_crt_parse_der_core( crt, buf, buflen, make_copy, cb, p_ctx );
1371 if( ret != 0 )
1372 {
1373 if( prev )
1374 prev->next = NULL;
1375
1376 if( crt != chain )
1377 mbedtls_free( crt );
1378
1379 return( ret );
1380 }
1381
1382 return( 0 );
1383 }
1384
mbedtls_x509_crt_parse_der_nocopy(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1385 int mbedtls_x509_crt_parse_der_nocopy( mbedtls_x509_crt *chain,
1386 const unsigned char *buf,
1387 size_t buflen )
1388 {
1389 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 0, NULL, NULL ) );
1390 }
1391
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)1392 int mbedtls_x509_crt_parse_der_with_ext_cb( mbedtls_x509_crt *chain,
1393 const unsigned char *buf,
1394 size_t buflen,
1395 int make_copy,
1396 mbedtls_x509_crt_ext_cb_t cb,
1397 void *p_ctx )
1398 {
1399 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, make_copy, cb, p_ctx ) );
1400 }
1401
mbedtls_x509_crt_parse_der(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1402 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain,
1403 const unsigned char *buf,
1404 size_t buflen )
1405 {
1406 return( mbedtls_x509_crt_parse_der_internal( chain, buf, buflen, 1, NULL, NULL ) );
1407 }
1408
1409 /*
1410 * Parse one or more PEM certificates from a buffer and add them to the chained
1411 * list
1412 */
mbedtls_x509_crt_parse(mbedtls_x509_crt * chain,const unsigned char * buf,size_t buflen)1413 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain,
1414 const unsigned char *buf,
1415 size_t buflen )
1416 {
1417 #if defined(MBEDTLS_PEM_PARSE_C)
1418 int success = 0, first_error = 0, total_failed = 0;
1419 int buf_format = MBEDTLS_X509_FORMAT_DER;
1420 #endif
1421
1422 /*
1423 * Check for valid input
1424 */
1425 if( chain == NULL || buf == NULL )
1426 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1427
1428 /*
1429 * Determine buffer content. Buffer contains either one DER certificate or
1430 * one or more PEM certificates.
1431 */
1432 #if defined(MBEDTLS_PEM_PARSE_C)
1433 if( buflen != 0 && buf[buflen - 1] == '\0' &&
1434 strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
1435 {
1436 buf_format = MBEDTLS_X509_FORMAT_PEM;
1437 }
1438
1439 if( buf_format == MBEDTLS_X509_FORMAT_DER )
1440 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
1441 #else
1442 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
1443 #endif
1444
1445 #if defined(MBEDTLS_PEM_PARSE_C)
1446 if( buf_format == MBEDTLS_X509_FORMAT_PEM )
1447 {
1448 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1449 mbedtls_pem_context pem;
1450
1451 /* 1 rather than 0 since the terminating NULL byte is counted in */
1452 while( buflen > 1 )
1453 {
1454 size_t use_len;
1455 mbedtls_pem_init( &pem );
1456
1457 /* If we get there, we know the string is null-terminated */
1458 ret = mbedtls_pem_read_buffer( &pem,
1459 "-----BEGIN CERTIFICATE-----",
1460 "-----END CERTIFICATE-----",
1461 buf, NULL, 0, &use_len );
1462
1463 if( ret == 0 )
1464 {
1465 /*
1466 * Was PEM encoded
1467 */
1468 buflen -= use_len;
1469 buf += use_len;
1470 }
1471 else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA )
1472 {
1473 return( ret );
1474 }
1475 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1476 {
1477 mbedtls_pem_free( &pem );
1478
1479 /*
1480 * PEM header and footer were found
1481 */
1482 buflen -= use_len;
1483 buf += use_len;
1484
1485 if( first_error == 0 )
1486 first_error = ret;
1487
1488 total_failed++;
1489 continue;
1490 }
1491 else
1492 break;
1493
1494 ret = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen );
1495
1496 mbedtls_pem_free( &pem );
1497
1498 if( ret != 0 )
1499 {
1500 /*
1501 * Quit parsing on a memory error
1502 */
1503 if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED )
1504 return( ret );
1505
1506 if( first_error == 0 )
1507 first_error = ret;
1508
1509 total_failed++;
1510 continue;
1511 }
1512
1513 success = 1;
1514 }
1515 }
1516
1517 if( success )
1518 return( total_failed );
1519 else if( first_error )
1520 return( first_error );
1521 else
1522 return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT );
1523 #endif /* MBEDTLS_PEM_PARSE_C */
1524 }
1525
1526 #if defined(MBEDTLS_FS_IO)
1527 /*
1528 * Load one or more certificates and add them to the chained list
1529 */
mbedtls_x509_crt_parse_file(mbedtls_x509_crt * chain,const char * path)1530 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path )
1531 {
1532 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1533 size_t n;
1534 unsigned char *buf;
1535
1536 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
1537 return( ret );
1538
1539 ret = mbedtls_x509_crt_parse( chain, buf, n );
1540
1541 mbedtls_platform_zeroize( buf, n );
1542 mbedtls_free( buf );
1543
1544 return( ret );
1545 }
1546
mbedtls_x509_crt_parse_path(mbedtls_x509_crt * chain,const char * path)1547 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path )
1548 {
1549 int ret = 0;
1550 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
1551 int w_ret;
1552 WCHAR szDir[MAX_PATH];
1553 char filename[MAX_PATH];
1554 char *p;
1555 size_t len = strlen( path );
1556
1557 WIN32_FIND_DATAW file_data;
1558 HANDLE hFind;
1559
1560 if( len > MAX_PATH - 3 )
1561 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1562
1563 memset( szDir, 0, sizeof(szDir) );
1564 memset( filename, 0, MAX_PATH );
1565 memcpy( filename, path, len );
1566 filename[len++] = '\\';
1567 p = filename + len;
1568 filename[len++] = '*';
1569
1570 w_ret = MultiByteToWideChar( CP_ACP, 0, filename, (int)len, szDir,
1571 MAX_PATH - 3 );
1572 if( w_ret == 0 )
1573 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1574
1575 hFind = FindFirstFileW( szDir, &file_data );
1576 if( hFind == INVALID_HANDLE_VALUE )
1577 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1578
1579 len = MAX_PATH - len;
1580 do
1581 {
1582 memset( p, 0, len );
1583
1584 if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
1585 continue;
1586
1587 w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName,
1588 lstrlenW( file_data.cFileName ),
1589 p, (int) len - 1,
1590 NULL, NULL );
1591 if( w_ret == 0 )
1592 {
1593 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1594 goto cleanup;
1595 }
1596
1597 w_ret = mbedtls_x509_crt_parse_file( chain, filename );
1598 if( w_ret < 0 )
1599 ret++;
1600 else
1601 ret += w_ret;
1602 }
1603 while( FindNextFileW( hFind, &file_data ) != 0 );
1604
1605 if( GetLastError() != ERROR_NO_MORE_FILES )
1606 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1607
1608 cleanup:
1609 FindClose( hFind );
1610 #else /* _WIN32 */
1611 int t_ret;
1612 int snp_ret;
1613 struct stat sb;
1614 struct dirent *entry;
1615 char entry_name[MBEDTLS_X509_MAX_FILE_PATH_LEN];
1616 DIR *dir = opendir( path );
1617
1618 if( dir == NULL )
1619 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1620
1621 #if defined(MBEDTLS_THREADING_C)
1622 if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 )
1623 {
1624 closedir( dir );
1625 return( ret );
1626 }
1627 #endif /* MBEDTLS_THREADING_C */
1628
1629 memset( &sb, 0, sizeof( sb ) );
1630
1631 while( ( entry = readdir( dir ) ) != NULL )
1632 {
1633 snp_ret = mbedtls_snprintf( entry_name, sizeof entry_name,
1634 "%s/%s", path, entry->d_name );
1635
1636 if( snp_ret < 0 || (size_t)snp_ret >= sizeof entry_name )
1637 {
1638 ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL;
1639 goto cleanup;
1640 }
1641 else if( stat( entry_name, &sb ) == -1 )
1642 {
1643 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1644 goto cleanup;
1645 }
1646
1647 if( !S_ISREG( sb.st_mode ) )
1648 continue;
1649
1650 // Ignore parse errors
1651 //
1652 t_ret = mbedtls_x509_crt_parse_file( chain, entry_name );
1653 if( t_ret < 0 )
1654 ret++;
1655 else
1656 ret += t_ret;
1657 }
1658
1659 cleanup:
1660 closedir( dir );
1661
1662 #if defined(MBEDTLS_THREADING_C)
1663 if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 )
1664 ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
1665 #endif /* MBEDTLS_THREADING_C */
1666
1667 #endif /* _WIN32 */
1668
1669 return( ret );
1670 }
1671 #endif /* MBEDTLS_FS_IO */
1672
1673 /*
1674 * OtherName ::= SEQUENCE {
1675 * type-id OBJECT IDENTIFIER,
1676 * value [0] EXPLICIT ANY DEFINED BY type-id }
1677 *
1678 * HardwareModuleName ::= SEQUENCE {
1679 * hwType OBJECT IDENTIFIER,
1680 * hwSerialNum OCTET STRING }
1681 *
1682 * NOTE: we currently only parse and use otherName of type HwModuleName,
1683 * as defined in RFC 4108.
1684 */
x509_get_other_name(const mbedtls_x509_buf * subject_alt_name,mbedtls_x509_san_other_name * other_name)1685 static int x509_get_other_name( const mbedtls_x509_buf *subject_alt_name,
1686 mbedtls_x509_san_other_name *other_name )
1687 {
1688 int ret = 0;
1689 size_t len;
1690 unsigned char *p = subject_alt_name->p;
1691 const unsigned char *end = p + subject_alt_name->len;
1692 mbedtls_x509_buf cur_oid;
1693
1694 if( ( subject_alt_name->tag &
1695 ( MBEDTLS_ASN1_TAG_CLASS_MASK | MBEDTLS_ASN1_TAG_VALUE_MASK ) ) !=
1696 ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ) )
1697 {
1698 /*
1699 * The given subject alternative name is not of type "othername".
1700 */
1701 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1702 }
1703
1704 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1705 MBEDTLS_ASN1_OID ) ) != 0 )
1706 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1707
1708 cur_oid.tag = MBEDTLS_ASN1_OID;
1709 cur_oid.p = p;
1710 cur_oid.len = len;
1711
1712 /*
1713 * Only HwModuleName is currently supported.
1714 */
1715 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME, &cur_oid ) != 0 )
1716 {
1717 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1718 }
1719
1720 if( p + len >= end )
1721 {
1722 mbedtls_platform_zeroize( other_name, sizeof( *other_name ) );
1723 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1724 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1725 }
1726 p += len;
1727 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1728 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_CONTEXT_SPECIFIC ) ) != 0 )
1729 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1730
1731 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1732 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
1733 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1734
1735 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, MBEDTLS_ASN1_OID ) ) != 0 )
1736 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1737
1738 other_name->value.hardware_module_name.oid.tag = MBEDTLS_ASN1_OID;
1739 other_name->value.hardware_module_name.oid.p = p;
1740 other_name->value.hardware_module_name.oid.len = len;
1741
1742 if( p + len >= end )
1743 {
1744 mbedtls_platform_zeroize( other_name, sizeof( *other_name ) );
1745 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1746 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1747 }
1748 p += len;
1749 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
1750 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
1751 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS, ret ) );
1752
1753 other_name->value.hardware_module_name.val.tag = MBEDTLS_ASN1_OCTET_STRING;
1754 other_name->value.hardware_module_name.val.p = p;
1755 other_name->value.hardware_module_name.val.len = len;
1756 p += len;
1757 if( p != end )
1758 {
1759 mbedtls_platform_zeroize( other_name,
1760 sizeof( *other_name ) );
1761 return( MBEDTLS_ERROR_ADD( MBEDTLS_ERR_X509_INVALID_EXTENSIONS,
1762 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ) );
1763 }
1764 return( 0 );
1765 }
1766
x509_info_subject_alt_name(char ** buf,size_t * size,const mbedtls_x509_sequence * subject_alt_name,const char * prefix)1767 static int x509_info_subject_alt_name( char **buf, size_t *size,
1768 const mbedtls_x509_sequence
1769 *subject_alt_name,
1770 const char *prefix )
1771 {
1772 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1773 size_t n = *size;
1774 char *p = *buf;
1775 const mbedtls_x509_sequence *cur = subject_alt_name;
1776 mbedtls_x509_subject_alternative_name san;
1777 int parse_ret;
1778
1779 while( cur != NULL )
1780 {
1781 memset( &san, 0, sizeof( san ) );
1782 parse_ret = mbedtls_x509_parse_subject_alt_name( &cur->buf, &san );
1783 if( parse_ret != 0 )
1784 {
1785 if( parse_ret == MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE )
1786 {
1787 ret = mbedtls_snprintf( p, n, "\n%s <unsupported>", prefix );
1788 MBEDTLS_X509_SAFE_SNPRINTF;
1789 }
1790 else
1791 {
1792 ret = mbedtls_snprintf( p, n, "\n%s <malformed>", prefix );
1793 MBEDTLS_X509_SAFE_SNPRINTF;
1794 }
1795 cur = cur->next;
1796 continue;
1797 }
1798
1799 switch( san.type )
1800 {
1801 /*
1802 * otherName
1803 */
1804 case MBEDTLS_X509_SAN_OTHER_NAME:
1805 {
1806 mbedtls_x509_san_other_name *other_name = &san.san.other_name;
1807
1808 ret = mbedtls_snprintf( p, n, "\n%s otherName :", prefix );
1809 MBEDTLS_X509_SAFE_SNPRINTF;
1810
1811 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ON_HW_MODULE_NAME,
1812 &other_name->value.hardware_module_name.oid ) != 0 )
1813 {
1814 ret = mbedtls_snprintf( p, n, "\n%s hardware module name :", prefix );
1815 MBEDTLS_X509_SAFE_SNPRINTF;
1816 ret = mbedtls_snprintf( p, n, "\n%s hardware type : ", prefix );
1817 MBEDTLS_X509_SAFE_SNPRINTF;
1818
1819 ret = mbedtls_oid_get_numeric_string( p, n, &other_name->value.hardware_module_name.oid );
1820 MBEDTLS_X509_SAFE_SNPRINTF;
1821
1822 ret = mbedtls_snprintf( p, n, "\n%s hardware serial number : ", prefix );
1823 MBEDTLS_X509_SAFE_SNPRINTF;
1824
1825 if( other_name->value.hardware_module_name.val.len >= n )
1826 {
1827 *p = '\0';
1828 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );
1829 }
1830
1831 memcpy( p, other_name->value.hardware_module_name.val.p,
1832 other_name->value.hardware_module_name.val.len );
1833 p += other_name->value.hardware_module_name.val.len;
1834
1835 n -= other_name->value.hardware_module_name.val.len;
1836
1837 }/* MBEDTLS_OID_ON_HW_MODULE_NAME */
1838 }
1839 break;
1840
1841 /*
1842 * dNSName
1843 */
1844 case MBEDTLS_X509_SAN_DNS_NAME:
1845 {
1846 ret = mbedtls_snprintf( p, n, "\n%s dNSName : ", prefix );
1847 MBEDTLS_X509_SAFE_SNPRINTF;
1848 if( san.san.unstructured_name.len >= n )
1849 {
1850 *p = '\0';
1851 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );
1852 }
1853
1854 memcpy( p, san.san.unstructured_name.p, san.san.unstructured_name.len );
1855 p += san.san.unstructured_name.len;
1856 n -= san.san.unstructured_name.len;
1857 }
1858 break;
1859
1860 /*
1861 * Type not supported, skip item.
1862 */
1863 default:
1864 ret = mbedtls_snprintf( p, n, "\n%s <unsupported>", prefix );
1865 MBEDTLS_X509_SAFE_SNPRINTF;
1866 break;
1867 }
1868
1869 cur = cur->next;
1870 }
1871
1872 *p = '\0';
1873
1874 *size = n;
1875 *buf = p;
1876
1877 return( 0 );
1878 }
1879
mbedtls_x509_parse_subject_alt_name(const mbedtls_x509_buf * san_buf,mbedtls_x509_subject_alternative_name * san)1880 int mbedtls_x509_parse_subject_alt_name( const mbedtls_x509_buf *san_buf,
1881 mbedtls_x509_subject_alternative_name *san )
1882 {
1883 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1884 switch( san_buf->tag &
1885 ( MBEDTLS_ASN1_TAG_CLASS_MASK |
1886 MBEDTLS_ASN1_TAG_VALUE_MASK ) )
1887 {
1888 /*
1889 * otherName
1890 */
1891 case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_OTHER_NAME ):
1892 {
1893 mbedtls_x509_san_other_name other_name;
1894
1895 ret = x509_get_other_name( san_buf, &other_name );
1896 if( ret != 0 )
1897 return( ret );
1898
1899 memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) );
1900 san->type = MBEDTLS_X509_SAN_OTHER_NAME;
1901 memcpy( &san->san.other_name,
1902 &other_name, sizeof( other_name ) );
1903
1904 }
1905 break;
1906
1907 /*
1908 * dNSName
1909 */
1910 case( MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_X509_SAN_DNS_NAME ):
1911 {
1912 memset( san, 0, sizeof( mbedtls_x509_subject_alternative_name ) );
1913 san->type = MBEDTLS_X509_SAN_DNS_NAME;
1914
1915 memcpy( &san->san.unstructured_name,
1916 san_buf, sizeof( *san_buf ) );
1917
1918 }
1919 break;
1920
1921 /*
1922 * Type not supported
1923 */
1924 default:
1925 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
1926 }
1927 return( 0 );
1928 }
1929
1930 #define PRINT_ITEM(i) \
1931 { \
1932 ret = mbedtls_snprintf( p, n, "%s" i, sep ); \
1933 MBEDTLS_X509_SAFE_SNPRINTF; \
1934 sep = ", "; \
1935 }
1936
1937 #define CERT_TYPE(type,name) \
1938 if( ns_cert_type & (type) ) \
1939 PRINT_ITEM( name );
1940
x509_info_cert_type(char ** buf,size_t * size,unsigned char ns_cert_type)1941 static int x509_info_cert_type( char **buf, size_t *size,
1942 unsigned char ns_cert_type )
1943 {
1944 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1945 size_t n = *size;
1946 char *p = *buf;
1947 const char *sep = "";
1948
1949 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" );
1950 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" );
1951 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" );
1952 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" );
1953 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" );
1954 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" );
1955 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" );
1956 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" );
1957
1958 *size = n;
1959 *buf = p;
1960
1961 return( 0 );
1962 }
1963
1964 #define KEY_USAGE(code,name) \
1965 if( key_usage & (code) ) \
1966 PRINT_ITEM( name );
1967
x509_info_key_usage(char ** buf,size_t * size,unsigned int key_usage)1968 static int x509_info_key_usage( char **buf, size_t *size,
1969 unsigned int key_usage )
1970 {
1971 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1972 size_t n = *size;
1973 char *p = *buf;
1974 const char *sep = "";
1975
1976 KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" );
1977 KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" );
1978 KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" );
1979 KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" );
1980 KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" );
1981 KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" );
1982 KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" );
1983 KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" );
1984 KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" );
1985
1986 *size = n;
1987 *buf = p;
1988
1989 return( 0 );
1990 }
1991
x509_info_ext_key_usage(char ** buf,size_t * size,const mbedtls_x509_sequence * extended_key_usage)1992 static int x509_info_ext_key_usage( char **buf, size_t *size,
1993 const mbedtls_x509_sequence *extended_key_usage )
1994 {
1995 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
1996 const char *desc;
1997 size_t n = *size;
1998 char *p = *buf;
1999 const mbedtls_x509_sequence *cur = extended_key_usage;
2000 const char *sep = "";
2001
2002 while( cur != NULL )
2003 {
2004 if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 )
2005 desc = "???";
2006
2007 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
2008 MBEDTLS_X509_SAFE_SNPRINTF;
2009
2010 sep = ", ";
2011
2012 cur = cur->next;
2013 }
2014
2015 *size = n;
2016 *buf = p;
2017
2018 return( 0 );
2019 }
2020
x509_info_cert_policies(char ** buf,size_t * size,const mbedtls_x509_sequence * certificate_policies)2021 static int x509_info_cert_policies( char **buf, size_t *size,
2022 const mbedtls_x509_sequence *certificate_policies )
2023 {
2024 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2025 const char *desc;
2026 size_t n = *size;
2027 char *p = *buf;
2028 const mbedtls_x509_sequence *cur = certificate_policies;
2029 const char *sep = "";
2030
2031 while( cur != NULL )
2032 {
2033 if( mbedtls_oid_get_certificate_policies( &cur->buf, &desc ) != 0 )
2034 desc = "???";
2035
2036 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
2037 MBEDTLS_X509_SAFE_SNPRINTF;
2038
2039 sep = ", ";
2040
2041 cur = cur->next;
2042 }
2043
2044 *size = n;
2045 *buf = p;
2046
2047 return( 0 );
2048 }
2049
2050 /*
2051 * Return an informational string about the certificate.
2052 */
2053 #define BEFORE_COLON 18
2054 #define BC "18"
mbedtls_x509_crt_info(char * buf,size_t size,const char * prefix,const mbedtls_x509_crt * crt)2055 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
2056 const mbedtls_x509_crt *crt )
2057 {
2058 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2059 size_t n;
2060 char *p;
2061 char key_size_str[BEFORE_COLON];
2062
2063 p = buf;
2064 n = size;
2065
2066 if( NULL == crt )
2067 {
2068 ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" );
2069 MBEDTLS_X509_SAFE_SNPRINTF;
2070
2071 return( (int) ( size - n ) );
2072 }
2073
2074 ret = mbedtls_snprintf( p, n, "%scert. version : %d\n",
2075 prefix, crt->version );
2076 MBEDTLS_X509_SAFE_SNPRINTF;
2077 ret = mbedtls_snprintf( p, n, "%sserial number : ",
2078 prefix );
2079 MBEDTLS_X509_SAFE_SNPRINTF;
2080
2081 ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
2082 MBEDTLS_X509_SAFE_SNPRINTF;
2083
2084 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix );
2085 MBEDTLS_X509_SAFE_SNPRINTF;
2086 ret = mbedtls_x509_dn_gets( p, n, &crt->issuer );
2087 MBEDTLS_X509_SAFE_SNPRINTF;
2088
2089 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
2090 MBEDTLS_X509_SAFE_SNPRINTF;
2091 ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
2092 MBEDTLS_X509_SAFE_SNPRINTF;
2093
2094 ret = mbedtls_snprintf( p, n, "\n%sissued on : " \
2095 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
2096 crt->valid_from.year, crt->valid_from.mon,
2097 crt->valid_from.day, crt->valid_from.hour,
2098 crt->valid_from.min, crt->valid_from.sec );
2099 MBEDTLS_X509_SAFE_SNPRINTF;
2100
2101 ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \
2102 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
2103 crt->valid_to.year, crt->valid_to.mon,
2104 crt->valid_to.day, crt->valid_to.hour,
2105 crt->valid_to.min, crt->valid_to.sec );
2106 MBEDTLS_X509_SAFE_SNPRINTF;
2107
2108 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
2109 MBEDTLS_X509_SAFE_SNPRINTF;
2110
2111 ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk,
2112 crt->sig_md, crt->sig_opts );
2113 MBEDTLS_X509_SAFE_SNPRINTF;
2114
2115 /* Key size */
2116 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
2117 mbedtls_pk_get_name( &crt->pk ) ) ) != 0 )
2118 {
2119 return( ret );
2120 }
2121
2122 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str,
2123 (int) mbedtls_pk_get_bitlen( &crt->pk ) );
2124 MBEDTLS_X509_SAFE_SNPRINTF;
2125
2126 /*
2127 * Optional extensions
2128 */
2129
2130 if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS )
2131 {
2132 ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix,
2133 crt->ca_istrue ? "true" : "false" );
2134 MBEDTLS_X509_SAFE_SNPRINTF;
2135
2136 if( crt->max_pathlen > 0 )
2137 {
2138 ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 );
2139 MBEDTLS_X509_SAFE_SNPRINTF;
2140 }
2141 }
2142
2143 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
2144 {
2145 ret = mbedtls_snprintf( p, n, "\n%ssubject alt name :", prefix );
2146 MBEDTLS_X509_SAFE_SNPRINTF;
2147
2148 if( ( ret = x509_info_subject_alt_name( &p, &n,
2149 &crt->subject_alt_names,
2150 prefix ) ) != 0 )
2151 return( ret );
2152 }
2153
2154 if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE )
2155 {
2156 ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix );
2157 MBEDTLS_X509_SAFE_SNPRINTF;
2158
2159 if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 )
2160 return( ret );
2161 }
2162
2163 if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE )
2164 {
2165 ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix );
2166 MBEDTLS_X509_SAFE_SNPRINTF;
2167
2168 if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 )
2169 return( ret );
2170 }
2171
2172 if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE )
2173 {
2174 ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix );
2175 MBEDTLS_X509_SAFE_SNPRINTF;
2176
2177 if( ( ret = x509_info_ext_key_usage( &p, &n,
2178 &crt->ext_key_usage ) ) != 0 )
2179 return( ret );
2180 }
2181
2182 if( crt->ext_types & MBEDTLS_OID_X509_EXT_CERTIFICATE_POLICIES )
2183 {
2184 ret = mbedtls_snprintf( p, n, "\n%scertificate policies : ", prefix );
2185 MBEDTLS_X509_SAFE_SNPRINTF;
2186
2187 if( ( ret = x509_info_cert_policies( &p, &n,
2188 &crt->certificate_policies ) ) != 0 )
2189 return( ret );
2190 }
2191
2192 ret = mbedtls_snprintf( p, n, "\n" );
2193 MBEDTLS_X509_SAFE_SNPRINTF;
2194
2195 return( (int) ( size - n ) );
2196 }
2197
2198 struct x509_crt_verify_string {
2199 int code;
2200 const char *string;
2201 };
2202
2203 static const struct x509_crt_verify_string x509_crt_verify_strings[] = {
2204 { MBEDTLS_X509_BADCERT_EXPIRED, "The certificate validity has expired" },
2205 { MBEDTLS_X509_BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" },
2206 { MBEDTLS_X509_BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" },
2207 { MBEDTLS_X509_BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" },
2208 { MBEDTLS_X509_BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" },
2209 { MBEDTLS_X509_BADCRL_EXPIRED, "The CRL is expired" },
2210 { MBEDTLS_X509_BADCERT_MISSING, "Certificate was missing" },
2211 { MBEDTLS_X509_BADCERT_SKIP_VERIFY, "Certificate verification was skipped" },
2212 { MBEDTLS_X509_BADCERT_OTHER, "Other reason (can be used by verify callback)" },
2213 { MBEDTLS_X509_BADCERT_FUTURE, "The certificate validity starts in the future" },
2214 { MBEDTLS_X509_BADCRL_FUTURE, "The CRL is from the future" },
2215 { MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" },
2216 { MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" },
2217 { MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" },
2218 { MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." },
2219 { MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
2220 { MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." },
2221 { MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." },
2222 { MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
2223 { MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." },
2224 { 0, NULL }
2225 };
2226
mbedtls_x509_crt_verify_info(char * buf,size_t size,const char * prefix,uint32_t flags)2227 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
2228 uint32_t flags )
2229 {
2230 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2231 const struct x509_crt_verify_string *cur;
2232 char *p = buf;
2233 size_t n = size;
2234
2235 for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ )
2236 {
2237 if( ( flags & cur->code ) == 0 )
2238 continue;
2239
2240 ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string );
2241 MBEDTLS_X509_SAFE_SNPRINTF;
2242 flags ^= cur->code;
2243 }
2244
2245 if( flags != 0 )
2246 {
2247 ret = mbedtls_snprintf( p, n, "%sUnknown reason "
2248 "(this should not happen)\n", prefix );
2249 MBEDTLS_X509_SAFE_SNPRINTF;
2250 }
2251
2252 return( (int) ( size - n ) );
2253 }
2254
2255 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
mbedtls_x509_crt_check_key_usage(const mbedtls_x509_crt * crt,unsigned int usage)2256 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
2257 unsigned int usage )
2258 {
2259 unsigned int usage_must, usage_may;
2260 unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY
2261 | MBEDTLS_X509_KU_DECIPHER_ONLY;
2262
2263 if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 )
2264 return( 0 );
2265
2266 usage_must = usage & ~may_mask;
2267
2268 if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must )
2269 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2270
2271 usage_may = usage & may_mask;
2272
2273 if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may )
2274 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2275
2276 return( 0 );
2277 }
2278 #endif
2279
2280 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
mbedtls_x509_crt_check_extended_key_usage(const mbedtls_x509_crt * crt,const char * usage_oid,size_t usage_len)2281 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
2282 const char *usage_oid,
2283 size_t usage_len )
2284 {
2285 const mbedtls_x509_sequence *cur;
2286
2287 /* Extension is not mandatory, absent means no restriction */
2288 if( ( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 )
2289 return( 0 );
2290
2291 /*
2292 * Look for the requested usage (or wildcard ANY) in our list
2293 */
2294 for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next )
2295 {
2296 const mbedtls_x509_buf *cur_oid = &cur->buf;
2297
2298 if( cur_oid->len == usage_len &&
2299 memcmp( cur_oid->p, usage_oid, usage_len ) == 0 )
2300 {
2301 return( 0 );
2302 }
2303
2304 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 )
2305 return( 0 );
2306 }
2307
2308 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2309 }
2310 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
2311
2312 #if defined(MBEDTLS_X509_CRL_PARSE_C)
2313 /*
2314 * Return 1 if the certificate is revoked, or 0 otherwise.
2315 */
mbedtls_x509_crt_is_revoked(const mbedtls_x509_crt * crt,const mbedtls_x509_crl * crl)2316 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl )
2317 {
2318 const mbedtls_x509_crl_entry *cur = &crl->entry;
2319
2320 while( cur != NULL && cur->serial.len != 0 )
2321 {
2322 if( crt->serial.len == cur->serial.len &&
2323 memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 )
2324 {
2325 return( 1 );
2326 }
2327
2328 cur = cur->next;
2329 }
2330
2331 return( 0 );
2332 }
2333
2334 /*
2335 * Check that the given certificate is not revoked according to the CRL.
2336 * Skip validation if no CRL for the given CA is present.
2337 */
x509_crt_verifycrl(mbedtls_x509_crt * crt,mbedtls_x509_crt * ca,mbedtls_x509_crl * crl_list,const mbedtls_x509_crt_profile * profile)2338 static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
2339 mbedtls_x509_crl *crl_list,
2340 const mbedtls_x509_crt_profile *profile )
2341 {
2342 int flags = 0;
2343 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
2344 const mbedtls_md_info_t *md_info;
2345
2346 if( ca == NULL )
2347 return( flags );
2348
2349 while( crl_list != NULL )
2350 {
2351 if( crl_list->version == 0 ||
2352 x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 )
2353 {
2354 crl_list = crl_list->next;
2355 continue;
2356 }
2357
2358 /*
2359 * Check if the CA is configured to sign CRLs
2360 */
2361 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
2362 if( mbedtls_x509_crt_check_key_usage( ca,
2363 MBEDTLS_X509_KU_CRL_SIGN ) != 0 )
2364 {
2365 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2366 break;
2367 }
2368 #endif
2369
2370 /*
2371 * Check if CRL is correctly signed by the trusted CA
2372 */
2373 if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 )
2374 flags |= MBEDTLS_X509_BADCRL_BAD_MD;
2375
2376 if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 )
2377 flags |= MBEDTLS_X509_BADCRL_BAD_PK;
2378
2379 md_info = mbedtls_md_info_from_type( crl_list->sig_md );
2380 if( mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ) != 0 )
2381 {
2382 /* Note: this can't happen except after an internal error */
2383 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2384 break;
2385 }
2386
2387 if( x509_profile_check_key( profile, &ca->pk ) != 0 )
2388 flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
2389
2390 if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk,
2391 crl_list->sig_md, hash, mbedtls_md_get_size( md_info ),
2392 crl_list->sig.p, crl_list->sig.len ) != 0 )
2393 {
2394 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
2395 break;
2396 }
2397
2398 /*
2399 * Check for validity of CRL (Do not drop out)
2400 */
2401 if( mbedtls_x509_time_is_past( &crl_list->next_update ) )
2402 flags |= MBEDTLS_X509_BADCRL_EXPIRED;
2403
2404 if( mbedtls_x509_time_is_future( &crl_list->this_update ) )
2405 flags |= MBEDTLS_X509_BADCRL_FUTURE;
2406
2407 /*
2408 * Check if certificate is revoked
2409 */
2410 if( mbedtls_x509_crt_is_revoked( crt, crl_list ) )
2411 {
2412 flags |= MBEDTLS_X509_BADCERT_REVOKED;
2413 break;
2414 }
2415
2416 crl_list = crl_list->next;
2417 }
2418
2419 return( flags );
2420 }
2421 #endif /* MBEDTLS_X509_CRL_PARSE_C */
2422
2423 /*
2424 * Check the signature of a certificate by its parent
2425 */
x509_crt_check_signature(const mbedtls_x509_crt * child,mbedtls_x509_crt * parent,mbedtls_x509_crt_restart_ctx * rs_ctx)2426 static int x509_crt_check_signature( const mbedtls_x509_crt *child,
2427 mbedtls_x509_crt *parent,
2428 mbedtls_x509_crt_restart_ctx *rs_ctx )
2429 {
2430 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
2431 size_t hash_len;
2432 #if !defined(MBEDTLS_USE_PSA_CRYPTO)
2433 const mbedtls_md_info_t *md_info;
2434 md_info = mbedtls_md_info_from_type( child->sig_md );
2435 hash_len = mbedtls_md_get_size( md_info );
2436
2437 /* Note: hash errors can happen only after an internal error */
2438 if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 )
2439 return( -1 );
2440 #else
2441 psa_hash_operation_t hash_operation = PSA_HASH_OPERATION_INIT;
2442 psa_algorithm_t hash_alg = mbedtls_psa_translate_md( child->sig_md );
2443
2444 if( psa_hash_setup( &hash_operation, hash_alg ) != PSA_SUCCESS )
2445 return( -1 );
2446
2447 if( psa_hash_update( &hash_operation, child->tbs.p, child->tbs.len )
2448 != PSA_SUCCESS )
2449 {
2450 return( -1 );
2451 }
2452
2453 if( psa_hash_finish( &hash_operation, hash, sizeof( hash ), &hash_len )
2454 != PSA_SUCCESS )
2455 {
2456 return( -1 );
2457 }
2458 #endif /* MBEDTLS_USE_PSA_CRYPTO */
2459 /* Skip expensive computation on obvious mismatch */
2460 if( ! mbedtls_pk_can_do( &parent->pk, child->sig_pk ) )
2461 return( -1 );
2462
2463 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2464 if( rs_ctx != NULL && child->sig_pk == MBEDTLS_PK_ECDSA )
2465 {
2466 return( mbedtls_pk_verify_restartable( &parent->pk,
2467 child->sig_md, hash, hash_len,
2468 child->sig.p, child->sig.len, &rs_ctx->pk ) );
2469 }
2470 #else
2471 (void) rs_ctx;
2472 #endif
2473
2474 return( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk,
2475 child->sig_md, hash, hash_len,
2476 child->sig.p, child->sig.len ) );
2477 }
2478
2479 /*
2480 * Check if 'parent' is a suitable parent (signing CA) for 'child'.
2481 * Return 0 if yes, -1 if not.
2482 *
2483 * top means parent is a locally-trusted certificate
2484 */
x509_crt_check_parent(const mbedtls_x509_crt * child,const mbedtls_x509_crt * parent,int top)2485 static int x509_crt_check_parent( const mbedtls_x509_crt *child,
2486 const mbedtls_x509_crt *parent,
2487 int top )
2488 {
2489 int need_ca_bit;
2490
2491 /* Parent must be the issuer */
2492 if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 )
2493 return( -1 );
2494
2495 /* Parent must have the basicConstraints CA bit set as a general rule */
2496 need_ca_bit = 1;
2497
2498 /* Exception: v1/v2 certificates that are locally trusted. */
2499 if( top && parent->version < 3 )
2500 need_ca_bit = 0;
2501
2502 if( need_ca_bit && ! parent->ca_istrue )
2503 return( -1 );
2504
2505 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
2506 if( need_ca_bit &&
2507 mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 )
2508 {
2509 return( -1 );
2510 }
2511 #endif
2512
2513 return( 0 );
2514 }
2515
2516 /*
2517 * Find a suitable parent for child in candidates, or return NULL.
2518 *
2519 * Here suitable is defined as:
2520 * 1. subject name matches child's issuer
2521 * 2. if necessary, the CA bit is set and key usage allows signing certs
2522 * 3. for trusted roots, the signature is correct
2523 * (for intermediates, the signature is checked and the result reported)
2524 * 4. pathlen constraints are satisfied
2525 *
2526 * If there's a suitable candidate which is also time-valid, return the first
2527 * such. Otherwise, return the first suitable candidate (or NULL if there is
2528 * none).
2529 *
2530 * The rationale for this rule is that someone could have a list of trusted
2531 * roots with two versions on the same root with different validity periods.
2532 * (At least one user reported having such a list and wanted it to just work.)
2533 * The reason we don't just require time-validity is that generally there is
2534 * only one version, and if it's expired we want the flags to state that
2535 * rather than NOT_TRUSTED, as would be the case if we required it here.
2536 *
2537 * The rationale for rule 3 (signature for trusted roots) is that users might
2538 * have two versions of the same CA with different keys in their list, and the
2539 * way we select the correct one is by checking the signature (as we don't
2540 * rely on key identifier extensions). (This is one way users might choose to
2541 * handle key rollover, another relies on self-issued certs, see [SIRO].)
2542 *
2543 * Arguments:
2544 * - [in] child: certificate for which we're looking for a parent
2545 * - [in] candidates: chained list of potential parents
2546 * - [out] r_parent: parent found (or NULL)
2547 * - [out] r_signature_is_good: 1 if child signature by parent is valid, or 0
2548 * - [in] top: 1 if candidates consists of trusted roots, ie we're at the top
2549 * of the chain, 0 otherwise
2550 * - [in] path_cnt: number of intermediates seen so far
2551 * - [in] self_cnt: number of self-signed intermediates seen so far
2552 * (will never be greater than path_cnt)
2553 * - [in-out] rs_ctx: context for restarting operations
2554 *
2555 * Return value:
2556 * - 0 on success
2557 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
2558 */
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)2559 static int x509_crt_find_parent_in(
2560 mbedtls_x509_crt *child,
2561 mbedtls_x509_crt *candidates,
2562 mbedtls_x509_crt **r_parent,
2563 int *r_signature_is_good,
2564 int top,
2565 unsigned path_cnt,
2566 unsigned self_cnt,
2567 mbedtls_x509_crt_restart_ctx *rs_ctx )
2568 {
2569 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2570 mbedtls_x509_crt *parent, *fallback_parent;
2571 int signature_is_good = 0, fallback_signature_is_good;
2572
2573 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2574 /* did we have something in progress? */
2575 if( rs_ctx != NULL && rs_ctx->parent != NULL )
2576 {
2577 /* restore saved state */
2578 parent = rs_ctx->parent;
2579 fallback_parent = rs_ctx->fallback_parent;
2580 fallback_signature_is_good = rs_ctx->fallback_signature_is_good;
2581
2582 /* clear saved state */
2583 rs_ctx->parent = NULL;
2584 rs_ctx->fallback_parent = NULL;
2585 rs_ctx->fallback_signature_is_good = 0;
2586
2587 /* resume where we left */
2588 goto check_signature;
2589 }
2590 #endif
2591
2592 fallback_parent = NULL;
2593 fallback_signature_is_good = 0;
2594
2595 for( parent = candidates; parent != NULL; parent = parent->next )
2596 {
2597 /* basic parenting skills (name, CA bit, key usage) */
2598 if( x509_crt_check_parent( child, parent, top ) != 0 )
2599 continue;
2600
2601 /* +1 because stored max_pathlen is 1 higher that the actual value */
2602 if( parent->max_pathlen > 0 &&
2603 (size_t) parent->max_pathlen < 1 + path_cnt - self_cnt )
2604 {
2605 continue;
2606 }
2607
2608 /* Signature */
2609 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2610 check_signature:
2611 #endif
2612 ret = x509_crt_check_signature( child, parent, rs_ctx );
2613
2614 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2615 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2616 {
2617 /* save state */
2618 rs_ctx->parent = parent;
2619 rs_ctx->fallback_parent = fallback_parent;
2620 rs_ctx->fallback_signature_is_good = fallback_signature_is_good;
2621
2622 return( ret );
2623 }
2624 #else
2625 (void) ret;
2626 #endif
2627
2628 signature_is_good = ret == 0;
2629 if( top && ! signature_is_good )
2630 continue;
2631
2632 /* optional time check */
2633 if( mbedtls_x509_time_is_past( &parent->valid_to ) ||
2634 mbedtls_x509_time_is_future( &parent->valid_from ) )
2635 {
2636 if( fallback_parent == NULL )
2637 {
2638 fallback_parent = parent;
2639 fallback_signature_is_good = signature_is_good;
2640 }
2641
2642 continue;
2643 }
2644
2645 *r_parent = parent;
2646 *r_signature_is_good = signature_is_good;
2647
2648 break;
2649 }
2650
2651 if( parent == NULL )
2652 {
2653 *r_parent = fallback_parent;
2654 *r_signature_is_good = fallback_signature_is_good;
2655 }
2656
2657 return( 0 );
2658 }
2659
2660 /*
2661 * Find a parent in trusted CAs or the provided chain, or return NULL.
2662 *
2663 * Searches in trusted CAs first, and return the first suitable parent found
2664 * (see find_parent_in() for definition of suitable).
2665 *
2666 * Arguments:
2667 * - [in] child: certificate for which we're looking for a parent, followed
2668 * by a chain of possible intermediates
2669 * - [in] trust_ca: list of locally trusted certificates
2670 * - [out] parent: parent found (or NULL)
2671 * - [out] parent_is_trusted: 1 if returned `parent` is trusted, or 0
2672 * - [out] signature_is_good: 1 if child signature by parent is valid, or 0
2673 * - [in] path_cnt: number of links in the chain so far (EE -> ... -> child)
2674 * - [in] self_cnt: number of self-signed certs in the chain so far
2675 * (will always be no greater than path_cnt)
2676 * - [in-out] rs_ctx: context for restarting operations
2677 *
2678 * Return value:
2679 * - 0 on success
2680 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise
2681 */
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)2682 static int x509_crt_find_parent(
2683 mbedtls_x509_crt *child,
2684 mbedtls_x509_crt *trust_ca,
2685 mbedtls_x509_crt **parent,
2686 int *parent_is_trusted,
2687 int *signature_is_good,
2688 unsigned path_cnt,
2689 unsigned self_cnt,
2690 mbedtls_x509_crt_restart_ctx *rs_ctx )
2691 {
2692 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2693 mbedtls_x509_crt *search_list;
2694
2695 *parent_is_trusted = 1;
2696
2697 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2698 /* restore then clear saved state if we have some stored */
2699 if( rs_ctx != NULL && rs_ctx->parent_is_trusted != -1 )
2700 {
2701 *parent_is_trusted = rs_ctx->parent_is_trusted;
2702 rs_ctx->parent_is_trusted = -1;
2703 }
2704 #endif
2705
2706 while( 1 ) {
2707 search_list = *parent_is_trusted ? trust_ca : child->next;
2708
2709 ret = x509_crt_find_parent_in( child, search_list,
2710 parent, signature_is_good,
2711 *parent_is_trusted,
2712 path_cnt, self_cnt, rs_ctx );
2713
2714 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2715 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2716 {
2717 /* save state */
2718 rs_ctx->parent_is_trusted = *parent_is_trusted;
2719 return( ret );
2720 }
2721 #else
2722 (void) ret;
2723 #endif
2724
2725 /* stop here if found or already in second iteration */
2726 if( *parent != NULL || *parent_is_trusted == 0 )
2727 break;
2728
2729 /* prepare second iteration */
2730 *parent_is_trusted = 0;
2731 }
2732
2733 /* extra precaution against mistakes in the caller */
2734 if( *parent == NULL )
2735 {
2736 *parent_is_trusted = 0;
2737 *signature_is_good = 0;
2738 }
2739
2740 return( 0 );
2741 }
2742
2743 /*
2744 * Check if an end-entity certificate is locally trusted
2745 *
2746 * Currently we require such certificates to be self-signed (actually only
2747 * check for self-issued as self-signatures are not checked)
2748 */
x509_crt_check_ee_locally_trusted(mbedtls_x509_crt * crt,mbedtls_x509_crt * trust_ca)2749 static int x509_crt_check_ee_locally_trusted(
2750 mbedtls_x509_crt *crt,
2751 mbedtls_x509_crt *trust_ca )
2752 {
2753 mbedtls_x509_crt *cur;
2754
2755 /* must be self-issued */
2756 if( x509_name_cmp( &crt->issuer, &crt->subject ) != 0 )
2757 return( -1 );
2758
2759 /* look for an exact match with trusted cert */
2760 for( cur = trust_ca; cur != NULL; cur = cur->next )
2761 {
2762 if( crt->raw.len == cur->raw.len &&
2763 memcmp( crt->raw.p, cur->raw.p, crt->raw.len ) == 0 )
2764 {
2765 return( 0 );
2766 }
2767 }
2768
2769 /* too bad */
2770 return( -1 );
2771 }
2772
2773 /*
2774 * Build and verify a certificate chain
2775 *
2776 * Given a peer-provided list of certificates EE, C1, ..., Cn and
2777 * a list of trusted certs R1, ... Rp, try to build and verify a chain
2778 * EE, Ci1, ... Ciq [, Rj]
2779 * such that every cert in the chain is a child of the next one,
2780 * jumping to a trusted root as early as possible.
2781 *
2782 * Verify that chain and return it with flags for all issues found.
2783 *
2784 * Special cases:
2785 * - EE == Rj -> return a one-element list containing it
2786 * - EE, Ci1, ..., Ciq cannot be continued with a trusted root
2787 * -> return that chain with NOT_TRUSTED set on Ciq
2788 *
2789 * Tests for (aspects of) this function should include at least:
2790 * - trusted EE
2791 * - EE -> trusted root
2792 * - EE -> intermediate CA -> trusted root
2793 * - if relevant: EE untrusted
2794 * - if relevant: EE -> intermediate, untrusted
2795 * with the aspect under test checked at each relevant level (EE, int, root).
2796 * For some aspects longer chains are required, but usually length 2 is
2797 * enough (but length 1 is not in general).
2798 *
2799 * Arguments:
2800 * - [in] crt: the cert list EE, C1, ..., Cn
2801 * - [in] trust_ca: the trusted list R1, ..., Rp
2802 * - [in] ca_crl, profile: as in verify_with_profile()
2803 * - [out] ver_chain: the built and verified chain
2804 * Only valid when return value is 0, may contain garbage otherwise!
2805 * Restart note: need not be the same when calling again to resume.
2806 * - [in-out] rs_ctx: context for restarting operations
2807 *
2808 * Return value:
2809 * - non-zero if the chain could not be fully built and examined
2810 * - 0 is the chain was successfully built and examined,
2811 * even if it was found to be invalid
2812 */
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)2813 static int x509_crt_verify_chain(
2814 mbedtls_x509_crt *crt,
2815 mbedtls_x509_crt *trust_ca,
2816 mbedtls_x509_crl *ca_crl,
2817 mbedtls_x509_crt_ca_cb_t f_ca_cb,
2818 void *p_ca_cb,
2819 const mbedtls_x509_crt_profile *profile,
2820 mbedtls_x509_crt_verify_chain *ver_chain,
2821 mbedtls_x509_crt_restart_ctx *rs_ctx )
2822 {
2823 /* Don't initialize any of those variables here, so that the compiler can
2824 * catch potential issues with jumping ahead when restarting */
2825 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
2826 uint32_t *flags;
2827 mbedtls_x509_crt_verify_chain_item *cur;
2828 mbedtls_x509_crt *child;
2829 mbedtls_x509_crt *parent;
2830 int parent_is_trusted;
2831 int child_is_trusted;
2832 int signature_is_good;
2833 unsigned self_cnt;
2834 mbedtls_x509_crt *cur_trust_ca = NULL;
2835
2836 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2837 /* resume if we had an operation in progress */
2838 if( rs_ctx != NULL && rs_ctx->in_progress == x509_crt_rs_find_parent )
2839 {
2840 /* restore saved state */
2841 *ver_chain = rs_ctx->ver_chain; /* struct copy */
2842 self_cnt = rs_ctx->self_cnt;
2843
2844 /* restore derived state */
2845 cur = &ver_chain->items[ver_chain->len - 1];
2846 child = cur->crt;
2847 flags = &cur->flags;
2848
2849 goto find_parent;
2850 }
2851 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
2852
2853 child = crt;
2854 self_cnt = 0;
2855 parent_is_trusted = 0;
2856 child_is_trusted = 0;
2857
2858 while( 1 ) {
2859 /* Add certificate to the verification chain */
2860 cur = &ver_chain->items[ver_chain->len];
2861 cur->crt = child;
2862 cur->flags = 0;
2863 ver_chain->len++;
2864 flags = &cur->flags;
2865
2866 /* Check time-validity (all certificates) */
2867 if( mbedtls_x509_time_is_past( &child->valid_to ) )
2868 *flags |= MBEDTLS_X509_BADCERT_EXPIRED;
2869
2870 if( mbedtls_x509_time_is_future( &child->valid_from ) )
2871 *flags |= MBEDTLS_X509_BADCERT_FUTURE;
2872
2873 /* Stop here for trusted roots (but not for trusted EE certs) */
2874 if( child_is_trusted )
2875 return( 0 );
2876
2877 /* Check signature algorithm: MD & PK algs */
2878 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
2879 *flags |= MBEDTLS_X509_BADCERT_BAD_MD;
2880
2881 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
2882 *flags |= MBEDTLS_X509_BADCERT_BAD_PK;
2883
2884 /* Special case: EE certs that are locally trusted */
2885 if( ver_chain->len == 1 &&
2886 x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 )
2887 {
2888 return( 0 );
2889 }
2890
2891 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2892 find_parent:
2893 #endif
2894
2895 /* Obtain list of potential trusted signers from CA callback,
2896 * or use statically provided list. */
2897 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
2898 if( f_ca_cb != NULL )
2899 {
2900 mbedtls_x509_crt_free( ver_chain->trust_ca_cb_result );
2901 mbedtls_free( ver_chain->trust_ca_cb_result );
2902 ver_chain->trust_ca_cb_result = NULL;
2903
2904 ret = f_ca_cb( p_ca_cb, child, &ver_chain->trust_ca_cb_result );
2905 if( ret != 0 )
2906 return( MBEDTLS_ERR_X509_FATAL_ERROR );
2907
2908 cur_trust_ca = ver_chain->trust_ca_cb_result;
2909 }
2910 else
2911 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
2912 {
2913 ((void) f_ca_cb);
2914 ((void) p_ca_cb);
2915 cur_trust_ca = trust_ca;
2916 }
2917
2918 /* Look for a parent in trusted CAs or up the chain */
2919 ret = x509_crt_find_parent( child, cur_trust_ca, &parent,
2920 &parent_is_trusted, &signature_is_good,
2921 ver_chain->len - 1, self_cnt, rs_ctx );
2922
2923 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
2924 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS )
2925 {
2926 /* save state */
2927 rs_ctx->in_progress = x509_crt_rs_find_parent;
2928 rs_ctx->self_cnt = self_cnt;
2929 rs_ctx->ver_chain = *ver_chain; /* struct copy */
2930
2931 return( ret );
2932 }
2933 #else
2934 (void) ret;
2935 #endif
2936
2937 /* No parent? We're done here */
2938 if( parent == NULL )
2939 {
2940 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2941 return( 0 );
2942 }
2943
2944 /* Count intermediate self-issued (not necessarily self-signed) certs.
2945 * These can occur with some strategies for key rollover, see [SIRO],
2946 * and should be excluded from max_pathlen checks. */
2947 if( ver_chain->len != 1 &&
2948 x509_name_cmp( &child->issuer, &child->subject ) == 0 )
2949 {
2950 self_cnt++;
2951 }
2952
2953 /* path_cnt is 0 for the first intermediate CA,
2954 * and if parent is trusted it's not an intermediate CA */
2955 if( ! parent_is_trusted &&
2956 ver_chain->len > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
2957 {
2958 /* return immediately to avoid overflow the chain array */
2959 return( MBEDTLS_ERR_X509_FATAL_ERROR );
2960 }
2961
2962 /* signature was checked while searching parent */
2963 if( ! signature_is_good )
2964 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2965
2966 /* check size of signing key */
2967 if( x509_profile_check_key( profile, &parent->pk ) != 0 )
2968 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
2969
2970 #if defined(MBEDTLS_X509_CRL_PARSE_C)
2971 /* Check trusted CA's CRL for the given crt */
2972 *flags |= x509_crt_verifycrl( child, parent, ca_crl, profile );
2973 #else
2974 (void) ca_crl;
2975 #endif
2976
2977 /* prepare for next iteration */
2978 child = parent;
2979 parent = NULL;
2980 child_is_trusted = parent_is_trusted;
2981 signature_is_good = 0;
2982 }
2983 }
2984
2985 /*
2986 * Check for CN match
2987 */
x509_crt_check_cn(const mbedtls_x509_buf * name,const char * cn,size_t cn_len)2988 static int x509_crt_check_cn( const mbedtls_x509_buf *name,
2989 const char *cn, size_t cn_len )
2990 {
2991 /* try exact match */
2992 if( name->len == cn_len &&
2993 x509_memcasecmp( cn, name->p, cn_len ) == 0 )
2994 {
2995 return( 0 );
2996 }
2997
2998 /* try wildcard match */
2999 if( x509_check_wildcard( cn, name ) == 0 )
3000 {
3001 return( 0 );
3002 }
3003
3004 return( -1 );
3005 }
3006
3007 /*
3008 * Check for SAN match, see RFC 5280 Section 4.2.1.6
3009 */
x509_crt_check_san(const mbedtls_x509_buf * name,const char * cn,size_t cn_len)3010 static int x509_crt_check_san( const mbedtls_x509_buf *name,
3011 const char *cn, size_t cn_len )
3012 {
3013 const unsigned char san_type = (unsigned char) name->tag &
3014 MBEDTLS_ASN1_TAG_VALUE_MASK;
3015
3016 /* dNSName */
3017 if( san_type == MBEDTLS_X509_SAN_DNS_NAME )
3018 return( x509_crt_check_cn( name, cn, cn_len ) );
3019
3020 /* (We may handle other types here later.) */
3021
3022 /* Unrecognized type */
3023 return( -1 );
3024 }
3025
3026 /*
3027 * Verify the requested CN - only call this if cn is not NULL!
3028 */
x509_crt_verify_name(const mbedtls_x509_crt * crt,const char * cn,uint32_t * flags)3029 static void x509_crt_verify_name( const mbedtls_x509_crt *crt,
3030 const char *cn,
3031 uint32_t *flags )
3032 {
3033 const mbedtls_x509_name *name;
3034 const mbedtls_x509_sequence *cur;
3035 size_t cn_len = strlen( cn );
3036
3037 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
3038 {
3039 for( cur = &crt->subject_alt_names; cur != NULL; cur = cur->next )
3040 {
3041 if( x509_crt_check_san( &cur->buf, cn, cn_len ) == 0 )
3042 break;
3043 }
3044
3045 if( cur == NULL )
3046 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
3047 }
3048 else
3049 {
3050 for( name = &crt->subject; name != NULL; name = name->next )
3051 {
3052 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 &&
3053 x509_crt_check_cn( &name->val, cn, cn_len ) == 0 )
3054 {
3055 break;
3056 }
3057 }
3058
3059 if( name == NULL )
3060 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
3061 }
3062 }
3063
3064 /*
3065 * Merge the flags for all certs in the chain, after calling callback
3066 */
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)3067 static int x509_crt_merge_flags_with_cb(
3068 uint32_t *flags,
3069 const mbedtls_x509_crt_verify_chain *ver_chain,
3070 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3071 void *p_vrfy )
3072 {
3073 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
3074 unsigned i;
3075 uint32_t cur_flags;
3076 const mbedtls_x509_crt_verify_chain_item *cur;
3077
3078 for( i = ver_chain->len; i != 0; --i )
3079 {
3080 cur = &ver_chain->items[i-1];
3081 cur_flags = cur->flags;
3082
3083 if( NULL != f_vrfy )
3084 if( ( ret = f_vrfy( p_vrfy, cur->crt, (int) i-1, &cur_flags ) ) != 0 )
3085 return( ret );
3086
3087 *flags |= cur_flags;
3088 }
3089
3090 return( 0 );
3091 }
3092
3093 /*
3094 * Verify the certificate validity, with profile, restartable version
3095 *
3096 * This function:
3097 * - checks the requested CN (if any)
3098 * - checks the type and size of the EE cert's key,
3099 * as that isn't done as part of chain building/verification currently
3100 * - builds and verifies the chain
3101 * - then calls the callback and merges the flags
3102 *
3103 * The parameters pairs `trust_ca`, `ca_crl` and `f_ca_cb`, `p_ca_cb`
3104 * are mutually exclusive: If `f_ca_cb != NULL`, it will be used by the
3105 * verification routine to search for trusted signers, and CRLs will
3106 * be disabled. Otherwise, `trust_ca` will be used as the static list
3107 * of trusted signers, and `ca_crl` will be use as the static list
3108 * of CRLs.
3109 */
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)3110 static int x509_crt_verify_restartable_ca_cb( mbedtls_x509_crt *crt,
3111 mbedtls_x509_crt *trust_ca,
3112 mbedtls_x509_crl *ca_crl,
3113 mbedtls_x509_crt_ca_cb_t f_ca_cb,
3114 void *p_ca_cb,
3115 const mbedtls_x509_crt_profile *profile,
3116 const char *cn, uint32_t *flags,
3117 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3118 void *p_vrfy,
3119 mbedtls_x509_crt_restart_ctx *rs_ctx )
3120 {
3121 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
3122 mbedtls_pk_type_t pk_type;
3123 mbedtls_x509_crt_verify_chain ver_chain;
3124 uint32_t ee_flags;
3125
3126 *flags = 0;
3127 ee_flags = 0;
3128 x509_crt_verify_chain_reset( &ver_chain );
3129
3130 if( profile == NULL )
3131 {
3132 ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA;
3133 goto exit;
3134 }
3135
3136 /* check name if requested */
3137 if( cn != NULL )
3138 x509_crt_verify_name( crt, cn, &ee_flags );
3139
3140 /* Check the type and size of the key */
3141 pk_type = mbedtls_pk_get_type( &crt->pk );
3142
3143 if( x509_profile_check_pk_alg( profile, pk_type ) != 0 )
3144 ee_flags |= MBEDTLS_X509_BADCERT_BAD_PK;
3145
3146 if( x509_profile_check_key( profile, &crt->pk ) != 0 )
3147 ee_flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
3148
3149 /* Check the chain */
3150 ret = x509_crt_verify_chain( crt, trust_ca, ca_crl,
3151 f_ca_cb, p_ca_cb, profile,
3152 &ver_chain, rs_ctx );
3153
3154 if( ret != 0 )
3155 goto exit;
3156
3157 /* Merge end-entity flags */
3158 ver_chain.items[0].flags |= ee_flags;
3159
3160 /* Build final flags, calling callback on the way if any */
3161 ret = x509_crt_merge_flags_with_cb( flags, &ver_chain, f_vrfy, p_vrfy );
3162
3163 exit:
3164
3165 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
3166 mbedtls_x509_crt_free( ver_chain.trust_ca_cb_result );
3167 mbedtls_free( ver_chain.trust_ca_cb_result );
3168 ver_chain.trust_ca_cb_result = NULL;
3169 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
3170
3171 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
3172 if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
3173 mbedtls_x509_crt_restart_free( rs_ctx );
3174 #endif
3175
3176 /* prevent misuse of the vrfy callback - VERIFY_FAILED would be ignored by
3177 * the SSL module for authmode optional, but non-zero return from the
3178 * callback means a fatal error so it shouldn't be ignored */
3179 if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED )
3180 ret = MBEDTLS_ERR_X509_FATAL_ERROR;
3181
3182 if( ret != 0 )
3183 {
3184 *flags = (uint32_t) -1;
3185 return( ret );
3186 }
3187
3188 if( *flags != 0 )
3189 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED );
3190
3191 return( 0 );
3192 }
3193
3194
3195 /*
3196 * Verify the certificate validity (default profile, not restartable)
3197 */
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)3198 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
3199 mbedtls_x509_crt *trust_ca,
3200 mbedtls_x509_crl *ca_crl,
3201 const char *cn, uint32_t *flags,
3202 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3203 void *p_vrfy )
3204 {
3205 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3206 NULL, NULL,
3207 &mbedtls_x509_crt_profile_default,
3208 cn, flags,
3209 f_vrfy, p_vrfy, NULL ) );
3210 }
3211
3212 /*
3213 * Verify the certificate validity (user-chosen profile, not restartable)
3214 */
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)3215 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
3216 mbedtls_x509_crt *trust_ca,
3217 mbedtls_x509_crl *ca_crl,
3218 const mbedtls_x509_crt_profile *profile,
3219 const char *cn, uint32_t *flags,
3220 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3221 void *p_vrfy )
3222 {
3223 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3224 NULL, NULL,
3225 profile, cn, flags,
3226 f_vrfy, p_vrfy, NULL ) );
3227 }
3228
3229 #if defined(MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK)
3230 /*
3231 * Verify the certificate validity (user-chosen profile, CA callback,
3232 * not restartable).
3233 */
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)3234 int mbedtls_x509_crt_verify_with_ca_cb( mbedtls_x509_crt *crt,
3235 mbedtls_x509_crt_ca_cb_t f_ca_cb,
3236 void *p_ca_cb,
3237 const mbedtls_x509_crt_profile *profile,
3238 const char *cn, uint32_t *flags,
3239 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3240 void *p_vrfy )
3241 {
3242 return( x509_crt_verify_restartable_ca_cb( crt, NULL, NULL,
3243 f_ca_cb, p_ca_cb,
3244 profile, cn, flags,
3245 f_vrfy, p_vrfy, NULL ) );
3246 }
3247 #endif /* MBEDTLS_X509_TRUSTED_CERTIFICATE_CALLBACK */
3248
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)3249 int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt,
3250 mbedtls_x509_crt *trust_ca,
3251 mbedtls_x509_crl *ca_crl,
3252 const mbedtls_x509_crt_profile *profile,
3253 const char *cn, uint32_t *flags,
3254 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
3255 void *p_vrfy,
3256 mbedtls_x509_crt_restart_ctx *rs_ctx )
3257 {
3258 return( x509_crt_verify_restartable_ca_cb( crt, trust_ca, ca_crl,
3259 NULL, NULL,
3260 profile, cn, flags,
3261 f_vrfy, p_vrfy, rs_ctx ) );
3262 }
3263
3264
3265 /*
3266 * Initialize a certificate chain
3267 */
mbedtls_x509_crt_init(mbedtls_x509_crt * crt)3268 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt )
3269 {
3270 memset( crt, 0, sizeof(mbedtls_x509_crt) );
3271 }
3272
3273 /*
3274 * Unallocate all certificate data
3275 */
mbedtls_x509_crt_free(mbedtls_x509_crt * crt)3276 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt )
3277 {
3278 mbedtls_x509_crt *cert_cur = crt;
3279 mbedtls_x509_crt *cert_prv;
3280 mbedtls_x509_name *name_cur;
3281 mbedtls_x509_name *name_prv;
3282 mbedtls_x509_sequence *seq_cur;
3283 mbedtls_x509_sequence *seq_prv;
3284
3285 if( crt == NULL )
3286 return;
3287
3288 do
3289 {
3290 mbedtls_pk_free( &cert_cur->pk );
3291
3292 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
3293 mbedtls_free( cert_cur->sig_opts );
3294 #endif
3295
3296 name_cur = cert_cur->issuer.next;
3297 while( name_cur != NULL )
3298 {
3299 name_prv = name_cur;
3300 name_cur = name_cur->next;
3301 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
3302 mbedtls_free( name_prv );
3303 }
3304
3305 name_cur = cert_cur->subject.next;
3306 while( name_cur != NULL )
3307 {
3308 name_prv = name_cur;
3309 name_cur = name_cur->next;
3310 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
3311 mbedtls_free( name_prv );
3312 }
3313
3314 seq_cur = cert_cur->ext_key_usage.next;
3315 while( seq_cur != NULL )
3316 {
3317 seq_prv = seq_cur;
3318 seq_cur = seq_cur->next;
3319 mbedtls_platform_zeroize( seq_prv,
3320 sizeof( mbedtls_x509_sequence ) );
3321 mbedtls_free( seq_prv );
3322 }
3323
3324 seq_cur = cert_cur->subject_alt_names.next;
3325 while( seq_cur != NULL )
3326 {
3327 seq_prv = seq_cur;
3328 seq_cur = seq_cur->next;
3329 mbedtls_platform_zeroize( seq_prv,
3330 sizeof( mbedtls_x509_sequence ) );
3331 mbedtls_free( seq_prv );
3332 }
3333
3334 seq_cur = cert_cur->certificate_policies.next;
3335 while( seq_cur != NULL )
3336 {
3337 seq_prv = seq_cur;
3338 seq_cur = seq_cur->next;
3339 mbedtls_platform_zeroize( seq_prv,
3340 sizeof( mbedtls_x509_sequence ) );
3341 mbedtls_free( seq_prv );
3342 }
3343
3344 if( cert_cur->raw.p != NULL && cert_cur->own_buffer )
3345 {
3346 mbedtls_platform_zeroize( cert_cur->raw.p, cert_cur->raw.len );
3347 mbedtls_free( cert_cur->raw.p );
3348 }
3349
3350 cert_cur = cert_cur->next;
3351 }
3352 while( cert_cur != NULL );
3353
3354 cert_cur = crt;
3355 do
3356 {
3357 cert_prv = cert_cur;
3358 cert_cur = cert_cur->next;
3359
3360 mbedtls_platform_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) );
3361 if( cert_prv != crt )
3362 mbedtls_free( cert_prv );
3363 }
3364 while( cert_cur != NULL );
3365 }
3366
3367 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
3368 /*
3369 * Initialize a restart context
3370 */
mbedtls_x509_crt_restart_init(mbedtls_x509_crt_restart_ctx * ctx)3371 void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx )
3372 {
3373 mbedtls_pk_restart_init( &ctx->pk );
3374
3375 ctx->parent = NULL;
3376 ctx->fallback_parent = NULL;
3377 ctx->fallback_signature_is_good = 0;
3378
3379 ctx->parent_is_trusted = -1;
3380
3381 ctx->in_progress = x509_crt_rs_none;
3382 ctx->self_cnt = 0;
3383 x509_crt_verify_chain_reset( &ctx->ver_chain );
3384 }
3385
3386 /*
3387 * Free the components of a restart context
3388 */
mbedtls_x509_crt_restart_free(mbedtls_x509_crt_restart_ctx * ctx)3389 void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx )
3390 {
3391 if( ctx == NULL )
3392 return;
3393
3394 mbedtls_pk_restart_free( &ctx->pk );
3395 mbedtls_x509_crt_restart_init( ctx );
3396 }
3397 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
3398
3399 #endif /* MBEDTLS_X509_CRT_PARSE_C */
3400