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[BCRYPT] Implement mbedTLS backend. Brought to you by Peter Hater. CORE-10934
[reactos.git] / reactos / dll / 3rdparty / mbedtls / x509_crt.c
1 /*
2 * X.509 certificate parsing and verification
3 *
4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
5 * SPDX-License-Identifier: Apache-2.0
6 *
7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
8 * not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
10 *
11 * http://www.apache.org/licenses/LICENSE-2.0
12 *
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
18 *
19 * This file is part of mbed TLS (https://tls.mbed.org)
20 */
21 /*
22 * The ITU-T X.509 standard defines a certificate format for PKI.
23 *
24 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs)
25 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs)
26 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10)
27 *
28 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf
29 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf
30 */
31
32 #if !defined(MBEDTLS_CONFIG_FILE)
33 #include "mbedtls/config.h"
34 #else
35 #include MBEDTLS_CONFIG_FILE
36 #endif
37
38 #if defined(MBEDTLS_X509_CRT_PARSE_C)
39
40 #include "mbedtls/x509_crt.h"
41 #include "mbedtls/oid.h"
42
43 #include <stdio.h>
44 #include <string.h>
45
46 #if defined(MBEDTLS_PEM_PARSE_C)
47 #include "mbedtls/pem.h"
48 #endif
49
50 #if defined(MBEDTLS_PLATFORM_C)
51 #include "mbedtls/platform.h"
52 #else
53 #include <stdlib.h>
54 #define mbedtls_free free
55 #define mbedtls_calloc calloc
56 #define mbedtls_snprintf snprintf
57 #endif
58
59 #if defined(MBEDTLS_THREADING_C)
60 #include "mbedtls/threading.h"
61 #endif
62
63 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
64 #include <windows.h>
65 #else
66 #include <time.h>
67 #endif
68
69 #if defined(MBEDTLS_FS_IO)
70 #include <stdio.h>
71 #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32)
72 #include <sys/types.h>
73 #include <sys/stat.h>
74 #include <dirent.h>
75 #endif /* !_WIN32 || EFIX64 || EFI32 */
76 #endif
77
78 /* Implementation that should never be optimized out by the compiler */
79 static void mbedtls_zeroize( void *v, size_t n ) {
80 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
81 }
82
83 /*
84 * Default profile
85 */
86 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default =
87 {
88 /* Hashes from SHA-1 and above */
89 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) |
90 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_RIPEMD160 ) |
91 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) |
92 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
93 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
94 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
95 0xFFFFFFF, /* Any PK alg */
96 0xFFFFFFF, /* Any curve */
97 2048,
98 };
99
100 /*
101 * Next-default profile
102 */
103 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next =
104 {
105 /* Hashes from SHA-256 and above */
106 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
107 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) |
108 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ),
109 0xFFFFFFF, /* Any PK alg */
110 #if defined(MBEDTLS_ECP_C)
111 /* Curves at or above 128-bit security level */
112 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
113 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) |
114 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) |
115 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) |
116 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) |
117 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) |
118 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ),
119 #else
120 0,
121 #endif
122 2048,
123 };
124
125 /*
126 * NSA Suite B Profile
127 */
128 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb =
129 {
130 /* Only SHA-256 and 384 */
131 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) |
132 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ),
133 /* Only ECDSA */
134 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ),
135 #if defined(MBEDTLS_ECP_C)
136 /* Only NIST P-256 and P-384 */
137 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) |
138 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ),
139 #else
140 0,
141 #endif
142 0,
143 };
144
145 /*
146 * Check md_alg against profile
147 * Return 0 if md_alg acceptable for this profile, -1 otherwise
148 */
149 static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile,
150 mbedtls_md_type_t md_alg )
151 {
152 if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 )
153 return( 0 );
154
155 return( -1 );
156 }
157
158 /*
159 * Check pk_alg against profile
160 * Return 0 if pk_alg acceptable for this profile, -1 otherwise
161 */
162 static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile,
163 mbedtls_pk_type_t pk_alg )
164 {
165 if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 )
166 return( 0 );
167
168 return( -1 );
169 }
170
171 /*
172 * Check key against profile
173 * Return 0 if pk_alg acceptable for this profile, -1 otherwise
174 */
175 static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile,
176 mbedtls_pk_type_t pk_alg,
177 const mbedtls_pk_context *pk )
178 {
179 #if defined(MBEDTLS_RSA_C)
180 if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS )
181 {
182 if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen )
183 return( 0 );
184
185 return( -1 );
186 }
187 #endif
188
189 #if defined(MBEDTLS_ECP_C)
190 if( pk_alg == MBEDTLS_PK_ECDSA ||
191 pk_alg == MBEDTLS_PK_ECKEY ||
192 pk_alg == MBEDTLS_PK_ECKEY_DH )
193 {
194 mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id;
195
196 if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 )
197 return( 0 );
198
199 return( -1 );
200 }
201 #endif
202
203 return( -1 );
204 }
205
206 /*
207 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
208 */
209 static int x509_get_version( unsigned char **p,
210 const unsigned char *end,
211 int *ver )
212 {
213 int ret;
214 size_t len;
215
216 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
217 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 )
218 {
219 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
220 {
221 *ver = 0;
222 return( 0 );
223 }
224
225 return( ret );
226 }
227
228 end = *p + len;
229
230 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 )
231 return( MBEDTLS_ERR_X509_INVALID_VERSION + ret );
232
233 if( *p != end )
234 return( MBEDTLS_ERR_X509_INVALID_VERSION +
235 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
236
237 return( 0 );
238 }
239
240 /*
241 * Validity ::= SEQUENCE {
242 * notBefore Time,
243 * notAfter Time }
244 */
245 static int x509_get_dates( unsigned char **p,
246 const unsigned char *end,
247 mbedtls_x509_time *from,
248 mbedtls_x509_time *to )
249 {
250 int ret;
251 size_t len;
252
253 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
254 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
255 return( MBEDTLS_ERR_X509_INVALID_DATE + ret );
256
257 end = *p + len;
258
259 if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 )
260 return( ret );
261
262 if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 )
263 return( ret );
264
265 if( *p != end )
266 return( MBEDTLS_ERR_X509_INVALID_DATE +
267 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
268
269 return( 0 );
270 }
271
272 /*
273 * X.509 v2/v3 unique identifier (not parsed)
274 */
275 static int x509_get_uid( unsigned char **p,
276 const unsigned char *end,
277 mbedtls_x509_buf *uid, int n )
278 {
279 int ret;
280
281 if( *p == end )
282 return( 0 );
283
284 uid->tag = **p;
285
286 if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len,
287 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 )
288 {
289 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
290 return( 0 );
291
292 return( ret );
293 }
294
295 uid->p = *p;
296 *p += uid->len;
297
298 return( 0 );
299 }
300
301 static int x509_get_basic_constraints( unsigned char **p,
302 const unsigned char *end,
303 int *ca_istrue,
304 int *max_pathlen )
305 {
306 int ret;
307 size_t len;
308
309 /*
310 * BasicConstraints ::= SEQUENCE {
311 * cA BOOLEAN DEFAULT FALSE,
312 * pathLenConstraint INTEGER (0..MAX) OPTIONAL }
313 */
314 *ca_istrue = 0; /* DEFAULT FALSE */
315 *max_pathlen = 0; /* endless */
316
317 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
318 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
319 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
320
321 if( *p == end )
322 return( 0 );
323
324 if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 )
325 {
326 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
327 ret = mbedtls_asn1_get_int( p, end, ca_istrue );
328
329 if( ret != 0 )
330 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
331
332 if( *ca_istrue != 0 )
333 *ca_istrue = 1;
334 }
335
336 if( *p == end )
337 return( 0 );
338
339 if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 )
340 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
341
342 if( *p != end )
343 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
344 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
345
346 (*max_pathlen)++;
347
348 return( 0 );
349 }
350
351 static int x509_get_ns_cert_type( unsigned char **p,
352 const unsigned char *end,
353 unsigned char *ns_cert_type)
354 {
355 int ret;
356 mbedtls_x509_bitstring bs = { 0, 0, NULL };
357
358 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
359 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
360
361 if( bs.len != 1 )
362 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
363 MBEDTLS_ERR_ASN1_INVALID_LENGTH );
364
365 /* Get actual bitstring */
366 *ns_cert_type = *bs.p;
367 return( 0 );
368 }
369
370 static int x509_get_key_usage( unsigned char **p,
371 const unsigned char *end,
372 unsigned int *key_usage)
373 {
374 int ret;
375 size_t i;
376 mbedtls_x509_bitstring bs = { 0, 0, NULL };
377
378 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 )
379 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
380
381 if( bs.len < 1 )
382 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
383 MBEDTLS_ERR_ASN1_INVALID_LENGTH );
384
385 /* Get actual bitstring */
386 *key_usage = 0;
387 for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ )
388 {
389 *key_usage |= (unsigned int) bs.p[i] << (8*i);
390 }
391
392 return( 0 );
393 }
394
395 /*
396 * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId
397 *
398 * KeyPurposeId ::= OBJECT IDENTIFIER
399 */
400 static int x509_get_ext_key_usage( unsigned char **p,
401 const unsigned char *end,
402 mbedtls_x509_sequence *ext_key_usage)
403 {
404 int ret;
405
406 if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 )
407 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
408
409 /* Sequence length must be >= 1 */
410 if( ext_key_usage->buf.p == NULL )
411 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
412 MBEDTLS_ERR_ASN1_INVALID_LENGTH );
413
414 return( 0 );
415 }
416
417 /*
418 * SubjectAltName ::= GeneralNames
419 *
420 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName
421 *
422 * GeneralName ::= CHOICE {
423 * otherName [0] OtherName,
424 * rfc822Name [1] IA5String,
425 * dNSName [2] IA5String,
426 * x400Address [3] ORAddress,
427 * directoryName [4] Name,
428 * ediPartyName [5] EDIPartyName,
429 * uniformResourceIdentifier [6] IA5String,
430 * iPAddress [7] OCTET STRING,
431 * registeredID [8] OBJECT IDENTIFIER }
432 *
433 * OtherName ::= SEQUENCE {
434 * type-id OBJECT IDENTIFIER,
435 * value [0] EXPLICIT ANY DEFINED BY type-id }
436 *
437 * EDIPartyName ::= SEQUENCE {
438 * nameAssigner [0] DirectoryString OPTIONAL,
439 * partyName [1] DirectoryString }
440 *
441 * NOTE: we only parse and use dNSName at this point.
442 */
443 static int x509_get_subject_alt_name( unsigned char **p,
444 const unsigned char *end,
445 mbedtls_x509_sequence *subject_alt_name )
446 {
447 int ret;
448 size_t len, tag_len;
449 mbedtls_asn1_buf *buf;
450 unsigned char tag;
451 mbedtls_asn1_sequence *cur = subject_alt_name;
452
453 /* Get main sequence tag */
454 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
455 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
456 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
457
458 if( *p + len != end )
459 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
460 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
461
462 while( *p < end )
463 {
464 if( ( end - *p ) < 1 )
465 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
466 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
467
468 tag = **p;
469 (*p)++;
470 if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 )
471 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
472
473 if( ( tag & MBEDTLS_ASN1_CONTEXT_SPECIFIC ) != MBEDTLS_ASN1_CONTEXT_SPECIFIC )
474 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
475 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
476
477 /* Skip everything but DNS name */
478 if( tag != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2 ) )
479 {
480 *p += tag_len;
481 continue;
482 }
483
484 /* Allocate and assign next pointer */
485 if( cur->buf.p != NULL )
486 {
487 if( cur->next != NULL )
488 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
489
490 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) );
491
492 if( cur->next == NULL )
493 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
494 MBEDTLS_ERR_ASN1_ALLOC_FAILED );
495
496 cur = cur->next;
497 }
498
499 buf = &(cur->buf);
500 buf->tag = tag;
501 buf->p = *p;
502 buf->len = tag_len;
503 *p += buf->len;
504 }
505
506 /* Set final sequence entry's next pointer to NULL */
507 cur->next = NULL;
508
509 if( *p != end )
510 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
511 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
512
513 return( 0 );
514 }
515
516 /*
517 * X.509 v3 extensions
518 *
519 * TODO: Perform all of the basic constraints tests required by the RFC
520 * TODO: Set values for undetected extensions to a sane default?
521 *
522 */
523 static int x509_get_crt_ext( unsigned char **p,
524 const unsigned char *end,
525 mbedtls_x509_crt *crt )
526 {
527 int ret;
528 size_t len;
529 unsigned char *end_ext_data, *end_ext_octet;
530
531 if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 )
532 {
533 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG )
534 return( 0 );
535
536 return( ret );
537 }
538
539 while( *p < end )
540 {
541 /*
542 * Extension ::= SEQUENCE {
543 * extnID OBJECT IDENTIFIER,
544 * critical BOOLEAN DEFAULT FALSE,
545 * extnValue OCTET STRING }
546 */
547 mbedtls_x509_buf extn_oid = {0, 0, NULL};
548 int is_critical = 0; /* DEFAULT FALSE */
549 int ext_type = 0;
550
551 if( ( ret = mbedtls_asn1_get_tag( p, end, &len,
552 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
553 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
554
555 end_ext_data = *p + len;
556
557 /* Get extension ID */
558 extn_oid.tag = **p;
559
560 if( ( ret = mbedtls_asn1_get_tag( p, end, &extn_oid.len, MBEDTLS_ASN1_OID ) ) != 0 )
561 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
562
563 extn_oid.p = *p;
564 *p += extn_oid.len;
565
566 if( ( end - *p ) < 1 )
567 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
568 MBEDTLS_ERR_ASN1_OUT_OF_DATA );
569
570 /* Get optional critical */
571 if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 &&
572 ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) )
573 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
574
575 /* Data should be octet string type */
576 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len,
577 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 )
578 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret );
579
580 end_ext_octet = *p + len;
581
582 if( end_ext_octet != end_ext_data )
583 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
584 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
585
586 /*
587 * Detect supported extensions
588 */
589 ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type );
590
591 if( ret != 0 )
592 {
593 /* No parser found, skip extension */
594 *p = end_ext_octet;
595
596 #if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION)
597 if( is_critical )
598 {
599 /* Data is marked as critical: fail */
600 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
601 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG );
602 }
603 #endif
604 continue;
605 }
606
607 /* Forbid repeated extensions */
608 if( ( crt->ext_types & ext_type ) != 0 )
609 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS );
610
611 crt->ext_types |= ext_type;
612
613 switch( ext_type )
614 {
615 case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS:
616 /* Parse basic constraints */
617 if( ( ret = x509_get_basic_constraints( p, end_ext_octet,
618 &crt->ca_istrue, &crt->max_pathlen ) ) != 0 )
619 return( ret );
620 break;
621
622 case MBEDTLS_X509_EXT_KEY_USAGE:
623 /* Parse key usage */
624 if( ( ret = x509_get_key_usage( p, end_ext_octet,
625 &crt->key_usage ) ) != 0 )
626 return( ret );
627 break;
628
629 case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE:
630 /* Parse extended key usage */
631 if( ( ret = x509_get_ext_key_usage( p, end_ext_octet,
632 &crt->ext_key_usage ) ) != 0 )
633 return( ret );
634 break;
635
636 case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME:
637 /* Parse subject alt name */
638 if( ( ret = x509_get_subject_alt_name( p, end_ext_octet,
639 &crt->subject_alt_names ) ) != 0 )
640 return( ret );
641 break;
642
643 case MBEDTLS_X509_EXT_NS_CERT_TYPE:
644 /* Parse netscape certificate type */
645 if( ( ret = x509_get_ns_cert_type( p, end_ext_octet,
646 &crt->ns_cert_type ) ) != 0 )
647 return( ret );
648 break;
649
650 default:
651 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE );
652 }
653 }
654
655 if( *p != end )
656 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS +
657 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
658
659 return( 0 );
660 }
661
662 /*
663 * Parse and fill a single X.509 certificate in DER format
664 */
665 static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *buf,
666 size_t buflen )
667 {
668 int ret;
669 size_t len;
670 unsigned char *p, *end, *crt_end;
671 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2;
672
673 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) );
674 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) );
675 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) );
676
677 /*
678 * Check for valid input
679 */
680 if( crt == NULL || buf == NULL )
681 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
682
683 p = mbedtls_calloc( 1, len = buflen );
684 if( p == NULL )
685 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
686
687 memcpy( p, buf, buflen );
688
689 crt->raw.p = p;
690 crt->raw.len = len;
691 end = p + len;
692
693 /*
694 * Certificate ::= SEQUENCE {
695 * tbsCertificate TBSCertificate,
696 * signatureAlgorithm AlgorithmIdentifier,
697 * signatureValue BIT STRING }
698 */
699 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
700 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
701 {
702 mbedtls_x509_crt_free( crt );
703 return( MBEDTLS_ERR_X509_INVALID_FORMAT );
704 }
705
706 if( len > (size_t) ( end - p ) )
707 {
708 mbedtls_x509_crt_free( crt );
709 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
710 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
711 }
712 crt_end = p + len;
713
714 /*
715 * TBSCertificate ::= SEQUENCE {
716 */
717 crt->tbs.p = p;
718
719 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
720 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
721 {
722 mbedtls_x509_crt_free( crt );
723 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
724 }
725
726 end = p + len;
727 crt->tbs.len = end - crt->tbs.p;
728
729 /*
730 * Version ::= INTEGER { v1(0), v2(1), v3(2) }
731 *
732 * CertificateSerialNumber ::= INTEGER
733 *
734 * signature AlgorithmIdentifier
735 */
736 if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 ||
737 ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 ||
738 ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid,
739 &sig_params1 ) ) != 0 )
740 {
741 mbedtls_x509_crt_free( crt );
742 return( ret );
743 }
744
745 crt->version++;
746
747 if( crt->version > 3 )
748 {
749 mbedtls_x509_crt_free( crt );
750 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION );
751 }
752
753 if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1,
754 &crt->sig_md, &crt->sig_pk,
755 &crt->sig_opts ) ) != 0 )
756 {
757 mbedtls_x509_crt_free( crt );
758 return( ret );
759 }
760
761 /*
762 * issuer Name
763 */
764 crt->issuer_raw.p = p;
765
766 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
767 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
768 {
769 mbedtls_x509_crt_free( crt );
770 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
771 }
772
773 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 )
774 {
775 mbedtls_x509_crt_free( crt );
776 return( ret );
777 }
778
779 crt->issuer_raw.len = p - crt->issuer_raw.p;
780
781 /*
782 * Validity ::= SEQUENCE {
783 * notBefore Time,
784 * notAfter Time }
785 *
786 */
787 if( ( ret = x509_get_dates( &p, end, &crt->valid_from,
788 &crt->valid_to ) ) != 0 )
789 {
790 mbedtls_x509_crt_free( crt );
791 return( ret );
792 }
793
794 /*
795 * subject Name
796 */
797 crt->subject_raw.p = p;
798
799 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len,
800 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 )
801 {
802 mbedtls_x509_crt_free( crt );
803 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret );
804 }
805
806 if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 )
807 {
808 mbedtls_x509_crt_free( crt );
809 return( ret );
810 }
811
812 crt->subject_raw.len = p - crt->subject_raw.p;
813
814 /*
815 * SubjectPublicKeyInfo
816 */
817 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 )
818 {
819 mbedtls_x509_crt_free( crt );
820 return( ret );
821 }
822
823 /*
824 * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL,
825 * -- If present, version shall be v2 or v3
826 * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL,
827 * -- If present, version shall be v2 or v3
828 * extensions [3] EXPLICIT Extensions OPTIONAL
829 * -- If present, version shall be v3
830 */
831 if( crt->version == 2 || crt->version == 3 )
832 {
833 ret = x509_get_uid( &p, end, &crt->issuer_id, 1 );
834 if( ret != 0 )
835 {
836 mbedtls_x509_crt_free( crt );
837 return( ret );
838 }
839 }
840
841 if( crt->version == 2 || crt->version == 3 )
842 {
843 ret = x509_get_uid( &p, end, &crt->subject_id, 2 );
844 if( ret != 0 )
845 {
846 mbedtls_x509_crt_free( crt );
847 return( ret );
848 }
849 }
850
851 #if !defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3)
852 if( crt->version == 3 )
853 #endif
854 {
855 ret = x509_get_crt_ext( &p, end, crt );
856 if( ret != 0 )
857 {
858 mbedtls_x509_crt_free( crt );
859 return( ret );
860 }
861 }
862
863 if( p != end )
864 {
865 mbedtls_x509_crt_free( crt );
866 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
867 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
868 }
869
870 end = crt_end;
871
872 /*
873 * }
874 * -- end of TBSCertificate
875 *
876 * signatureAlgorithm AlgorithmIdentifier,
877 * signatureValue BIT STRING
878 */
879 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 )
880 {
881 mbedtls_x509_crt_free( crt );
882 return( ret );
883 }
884
885 if( crt->sig_oid.len != sig_oid2.len ||
886 memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 ||
887 sig_params1.len != sig_params2.len ||
888 ( sig_params1.len != 0 &&
889 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) )
890 {
891 mbedtls_x509_crt_free( crt );
892 return( MBEDTLS_ERR_X509_SIG_MISMATCH );
893 }
894
895 if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 )
896 {
897 mbedtls_x509_crt_free( crt );
898 return( ret );
899 }
900
901 if( p != end )
902 {
903 mbedtls_x509_crt_free( crt );
904 return( MBEDTLS_ERR_X509_INVALID_FORMAT +
905 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH );
906 }
907
908 return( 0 );
909 }
910
911 /*
912 * Parse one X.509 certificate in DER format from a buffer and add them to a
913 * chained list
914 */
915 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf,
916 size_t buflen )
917 {
918 int ret;
919 mbedtls_x509_crt *crt = chain, *prev = NULL;
920
921 /*
922 * Check for valid input
923 */
924 if( crt == NULL || buf == NULL )
925 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
926
927 while( crt->version != 0 && crt->next != NULL )
928 {
929 prev = crt;
930 crt = crt->next;
931 }
932
933 /*
934 * Add new certificate on the end of the chain if needed.
935 */
936 if( crt->version != 0 && crt->next == NULL )
937 {
938 crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) );
939
940 if( crt->next == NULL )
941 return( MBEDTLS_ERR_X509_ALLOC_FAILED );
942
943 prev = crt;
944 mbedtls_x509_crt_init( crt->next );
945 crt = crt->next;
946 }
947
948 if( ( ret = x509_crt_parse_der_core( crt, buf, buflen ) ) != 0 )
949 {
950 if( prev )
951 prev->next = NULL;
952
953 if( crt != chain )
954 mbedtls_free( crt );
955
956 return( ret );
957 }
958
959 return( 0 );
960 }
961
962 /*
963 * Parse one or more PEM certificates from a buffer and add them to the chained
964 * list
965 */
966 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen )
967 {
968 int success = 0, first_error = 0, total_failed = 0;
969 int buf_format = MBEDTLS_X509_FORMAT_DER;
970
971 /*
972 * Check for valid input
973 */
974 if( chain == NULL || buf == NULL )
975 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
976
977 /*
978 * Determine buffer content. Buffer contains either one DER certificate or
979 * one or more PEM certificates.
980 */
981 #if defined(MBEDTLS_PEM_PARSE_C)
982 if( buflen != 0 && buf[buflen - 1] == '\0' &&
983 strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL )
984 {
985 buf_format = MBEDTLS_X509_FORMAT_PEM;
986 }
987 #endif
988
989 if( buf_format == MBEDTLS_X509_FORMAT_DER )
990 return mbedtls_x509_crt_parse_der( chain, buf, buflen );
991
992 #if defined(MBEDTLS_PEM_PARSE_C)
993 if( buf_format == MBEDTLS_X509_FORMAT_PEM )
994 {
995 int ret;
996 mbedtls_pem_context pem;
997
998 /* 1 rather than 0 since the terminating NULL byte is counted in */
999 while( buflen > 1 )
1000 {
1001 size_t use_len;
1002 mbedtls_pem_init( &pem );
1003
1004 /* If we get there, we know the string is null-terminated */
1005 ret = mbedtls_pem_read_buffer( &pem,
1006 "-----BEGIN CERTIFICATE-----",
1007 "-----END CERTIFICATE-----",
1008 buf, NULL, 0, &use_len );
1009
1010 if( ret == 0 )
1011 {
1012 /*
1013 * Was PEM encoded
1014 */
1015 buflen -= use_len;
1016 buf += use_len;
1017 }
1018 else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA )
1019 {
1020 return( ret );
1021 }
1022 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT )
1023 {
1024 mbedtls_pem_free( &pem );
1025
1026 /*
1027 * PEM header and footer were found
1028 */
1029 buflen -= use_len;
1030 buf += use_len;
1031
1032 if( first_error == 0 )
1033 first_error = ret;
1034
1035 total_failed++;
1036 continue;
1037 }
1038 else
1039 break;
1040
1041 ret = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen );
1042
1043 mbedtls_pem_free( &pem );
1044
1045 if( ret != 0 )
1046 {
1047 /*
1048 * Quit parsing on a memory error
1049 */
1050 if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED )
1051 return( ret );
1052
1053 if( first_error == 0 )
1054 first_error = ret;
1055
1056 total_failed++;
1057 continue;
1058 }
1059
1060 success = 1;
1061 }
1062 }
1063 #endif /* MBEDTLS_PEM_PARSE_C */
1064
1065 if( success )
1066 return( total_failed );
1067 else if( first_error )
1068 return( first_error );
1069 else
1070 return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT );
1071 }
1072
1073 #if defined(MBEDTLS_FS_IO)
1074 /*
1075 * Load one or more certificates and add them to the chained list
1076 */
1077 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path )
1078 {
1079 int ret;
1080 size_t n;
1081 unsigned char *buf;
1082
1083 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 )
1084 return( ret );
1085
1086 ret = mbedtls_x509_crt_parse( chain, buf, n );
1087
1088 mbedtls_zeroize( buf, n );
1089 mbedtls_free( buf );
1090
1091 return( ret );
1092 }
1093
1094 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path )
1095 {
1096 int ret = 0;
1097 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32)
1098 int w_ret;
1099 WCHAR szDir[MAX_PATH];
1100 char filename[MAX_PATH];
1101 char *p;
1102 size_t len = strlen( path );
1103
1104 WIN32_FIND_DATAW file_data;
1105 HANDLE hFind;
1106
1107 if( len > MAX_PATH - 3 )
1108 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1109
1110 memset( szDir, 0, sizeof(szDir) );
1111 memset( filename, 0, MAX_PATH );
1112 memcpy( filename, path, len );
1113 filename[len++] = '\\';
1114 p = filename + len;
1115 filename[len++] = '*';
1116
1117 w_ret = MultiByteToWideChar( CP_ACP, 0, filename, len, szDir,
1118 MAX_PATH - 3 );
1119 if( w_ret == 0 )
1120 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1121
1122 hFind = FindFirstFileW( szDir, &file_data );
1123 if( hFind == INVALID_HANDLE_VALUE )
1124 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1125
1126 len = MAX_PATH - len;
1127 do
1128 {
1129 memset( p, 0, len );
1130
1131 if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY )
1132 continue;
1133
1134 w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName,
1135 lstrlenW( file_data.cFileName ),
1136 p, (int) len - 1,
1137 NULL, NULL );
1138 if( w_ret == 0 )
1139 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1140
1141 w_ret = mbedtls_x509_crt_parse_file( chain, filename );
1142 if( w_ret < 0 )
1143 ret++;
1144 else
1145 ret += w_ret;
1146 }
1147 while( FindNextFileW( hFind, &file_data ) != 0 );
1148
1149 if( GetLastError() != ERROR_NO_MORE_FILES )
1150 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1151
1152 FindClose( hFind );
1153 #else /* _WIN32 */
1154 int t_ret;
1155 struct stat sb;
1156 struct dirent *entry;
1157 char entry_name[255];
1158 DIR *dir = opendir( path );
1159
1160 if( dir == NULL )
1161 return( MBEDTLS_ERR_X509_FILE_IO_ERROR );
1162
1163 #if defined(MBEDTLS_THREADING_PTHREAD)
1164 if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 )
1165 {
1166 closedir( dir );
1167 return( ret );
1168 }
1169 #endif
1170
1171 while( ( entry = readdir( dir ) ) != NULL )
1172 {
1173 mbedtls_snprintf( entry_name, sizeof entry_name, "%s/%s", path, entry->d_name );
1174
1175 if( stat( entry_name, &sb ) == -1 )
1176 {
1177 closedir( dir );
1178 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR;
1179 goto cleanup;
1180 }
1181
1182 if( !S_ISREG( sb.st_mode ) )
1183 continue;
1184
1185 // Ignore parse errors
1186 //
1187 t_ret = mbedtls_x509_crt_parse_file( chain, entry_name );
1188 if( t_ret < 0 )
1189 ret++;
1190 else
1191 ret += t_ret;
1192 }
1193 closedir( dir );
1194
1195 cleanup:
1196 #if defined(MBEDTLS_THREADING_PTHREAD)
1197 if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 )
1198 ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR;
1199 #endif
1200
1201 #endif /* _WIN32 */
1202
1203 return( ret );
1204 }
1205 #endif /* MBEDTLS_FS_IO */
1206
1207 static int x509_info_subject_alt_name( char **buf, size_t *size,
1208 const mbedtls_x509_sequence *subject_alt_name )
1209 {
1210 size_t i;
1211 size_t n = *size;
1212 char *p = *buf;
1213 const mbedtls_x509_sequence *cur = subject_alt_name;
1214 const char *sep = "";
1215 size_t sep_len = 0;
1216
1217 while( cur != NULL )
1218 {
1219 if( cur->buf.len + sep_len >= n )
1220 {
1221 *p = '\0';
1222 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL );
1223 }
1224
1225 n -= cur->buf.len + sep_len;
1226 for( i = 0; i < sep_len; i++ )
1227 *p++ = sep[i];
1228 for( i = 0; i < cur->buf.len; i++ )
1229 *p++ = cur->buf.p[i];
1230
1231 sep = ", ";
1232 sep_len = 2;
1233
1234 cur = cur->next;
1235 }
1236
1237 *p = '\0';
1238
1239 *size = n;
1240 *buf = p;
1241
1242 return( 0 );
1243 }
1244
1245 #define PRINT_ITEM(i) \
1246 { \
1247 ret = mbedtls_snprintf( p, n, "%s" i, sep ); \
1248 MBEDTLS_X509_SAFE_SNPRINTF; \
1249 sep = ", "; \
1250 }
1251
1252 #define CERT_TYPE(type,name) \
1253 if( ns_cert_type & type ) \
1254 PRINT_ITEM( name );
1255
1256 static int x509_info_cert_type( char **buf, size_t *size,
1257 unsigned char ns_cert_type )
1258 {
1259 int ret;
1260 size_t n = *size;
1261 char *p = *buf;
1262 const char *sep = "";
1263
1264 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" );
1265 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" );
1266 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" );
1267 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" );
1268 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" );
1269 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" );
1270 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" );
1271 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" );
1272
1273 *size = n;
1274 *buf = p;
1275
1276 return( 0 );
1277 }
1278
1279 #define KEY_USAGE(code,name) \
1280 if( key_usage & code ) \
1281 PRINT_ITEM( name );
1282
1283 static int x509_info_key_usage( char **buf, size_t *size,
1284 unsigned int key_usage )
1285 {
1286 int ret;
1287 size_t n = *size;
1288 char *p = *buf;
1289 const char *sep = "";
1290
1291 KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" );
1292 KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" );
1293 KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" );
1294 KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" );
1295 KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" );
1296 KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" );
1297 KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" );
1298 KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" );
1299 KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" );
1300
1301 *size = n;
1302 *buf = p;
1303
1304 return( 0 );
1305 }
1306
1307 static int x509_info_ext_key_usage( char **buf, size_t *size,
1308 const mbedtls_x509_sequence *extended_key_usage )
1309 {
1310 int ret;
1311 const char *desc;
1312 size_t n = *size;
1313 char *p = *buf;
1314 const mbedtls_x509_sequence *cur = extended_key_usage;
1315 const char *sep = "";
1316
1317 while( cur != NULL )
1318 {
1319 if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 )
1320 desc = "???";
1321
1322 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc );
1323 MBEDTLS_X509_SAFE_SNPRINTF;
1324
1325 sep = ", ";
1326
1327 cur = cur->next;
1328 }
1329
1330 *size = n;
1331 *buf = p;
1332
1333 return( 0 );
1334 }
1335
1336 /*
1337 * Return an informational string about the certificate.
1338 */
1339 #define BEFORE_COLON 18
1340 #define BC "18"
1341 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix,
1342 const mbedtls_x509_crt *crt )
1343 {
1344 int ret;
1345 size_t n;
1346 char *p;
1347 char key_size_str[BEFORE_COLON];
1348
1349 p = buf;
1350 n = size;
1351
1352 ret = mbedtls_snprintf( p, n, "%scert. version : %d\n",
1353 prefix, crt->version );
1354 MBEDTLS_X509_SAFE_SNPRINTF;
1355 ret = mbedtls_snprintf( p, n, "%sserial number : ",
1356 prefix );
1357 MBEDTLS_X509_SAFE_SNPRINTF;
1358
1359 ret = mbedtls_x509_serial_gets( p, n, &crt->serial );
1360 MBEDTLS_X509_SAFE_SNPRINTF;
1361
1362 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix );
1363 MBEDTLS_X509_SAFE_SNPRINTF;
1364 ret = mbedtls_x509_dn_gets( p, n, &crt->issuer );
1365 MBEDTLS_X509_SAFE_SNPRINTF;
1366
1367 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix );
1368 MBEDTLS_X509_SAFE_SNPRINTF;
1369 ret = mbedtls_x509_dn_gets( p, n, &crt->subject );
1370 MBEDTLS_X509_SAFE_SNPRINTF;
1371
1372 ret = mbedtls_snprintf( p, n, "\n%sissued on : " \
1373 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
1374 crt->valid_from.year, crt->valid_from.mon,
1375 crt->valid_from.day, crt->valid_from.hour,
1376 crt->valid_from.min, crt->valid_from.sec );
1377 MBEDTLS_X509_SAFE_SNPRINTF;
1378
1379 ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \
1380 "%04d-%02d-%02d %02d:%02d:%02d", prefix,
1381 crt->valid_to.year, crt->valid_to.mon,
1382 crt->valid_to.day, crt->valid_to.hour,
1383 crt->valid_to.min, crt->valid_to.sec );
1384 MBEDTLS_X509_SAFE_SNPRINTF;
1385
1386 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix );
1387 MBEDTLS_X509_SAFE_SNPRINTF;
1388
1389 ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk,
1390 crt->sig_md, crt->sig_opts );
1391 MBEDTLS_X509_SAFE_SNPRINTF;
1392
1393 /* Key size */
1394 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON,
1395 mbedtls_pk_get_name( &crt->pk ) ) ) != 0 )
1396 {
1397 return( ret );
1398 }
1399
1400 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str,
1401 (int) mbedtls_pk_get_bitlen( &crt->pk ) );
1402 MBEDTLS_X509_SAFE_SNPRINTF;
1403
1404 /*
1405 * Optional extensions
1406 */
1407
1408 if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS )
1409 {
1410 ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix,
1411 crt->ca_istrue ? "true" : "false" );
1412 MBEDTLS_X509_SAFE_SNPRINTF;
1413
1414 if( crt->max_pathlen > 0 )
1415 {
1416 ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 );
1417 MBEDTLS_X509_SAFE_SNPRINTF;
1418 }
1419 }
1420
1421 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
1422 {
1423 ret = mbedtls_snprintf( p, n, "\n%ssubject alt name : ", prefix );
1424 MBEDTLS_X509_SAFE_SNPRINTF;
1425
1426 if( ( ret = x509_info_subject_alt_name( &p, &n,
1427 &crt->subject_alt_names ) ) != 0 )
1428 return( ret );
1429 }
1430
1431 if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE )
1432 {
1433 ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix );
1434 MBEDTLS_X509_SAFE_SNPRINTF;
1435
1436 if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 )
1437 return( ret );
1438 }
1439
1440 if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE )
1441 {
1442 ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix );
1443 MBEDTLS_X509_SAFE_SNPRINTF;
1444
1445 if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 )
1446 return( ret );
1447 }
1448
1449 if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE )
1450 {
1451 ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix );
1452 MBEDTLS_X509_SAFE_SNPRINTF;
1453
1454 if( ( ret = x509_info_ext_key_usage( &p, &n,
1455 &crt->ext_key_usage ) ) != 0 )
1456 return( ret );
1457 }
1458
1459 ret = mbedtls_snprintf( p, n, "\n" );
1460 MBEDTLS_X509_SAFE_SNPRINTF;
1461
1462 return( (int) ( size - n ) );
1463 }
1464
1465 struct x509_crt_verify_string {
1466 int code;
1467 const char *string;
1468 };
1469
1470 static const struct x509_crt_verify_string x509_crt_verify_strings[] = {
1471 { MBEDTLS_X509_BADCERT_EXPIRED, "The certificate validity has expired" },
1472 { MBEDTLS_X509_BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" },
1473 { MBEDTLS_X509_BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" },
1474 { MBEDTLS_X509_BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" },
1475 { MBEDTLS_X509_BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" },
1476 { MBEDTLS_X509_BADCRL_EXPIRED, "The CRL is expired" },
1477 { MBEDTLS_X509_BADCERT_MISSING, "Certificate was missing" },
1478 { MBEDTLS_X509_BADCERT_SKIP_VERIFY, "Certificate verification was skipped" },
1479 { MBEDTLS_X509_BADCERT_OTHER, "Other reason (can be used by verify callback)" },
1480 { MBEDTLS_X509_BADCERT_FUTURE, "The certificate validity starts in the future" },
1481 { MBEDTLS_X509_BADCRL_FUTURE, "The CRL is from the future" },
1482 { MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" },
1483 { MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" },
1484 { MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" },
1485 { MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." },
1486 { MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
1487 { MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." },
1488 { MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." },
1489 { MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." },
1490 { MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." },
1491 { 0, NULL }
1492 };
1493
1494 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix,
1495 uint32_t flags )
1496 {
1497 int ret;
1498 const struct x509_crt_verify_string *cur;
1499 char *p = buf;
1500 size_t n = size;
1501
1502 for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ )
1503 {
1504 if( ( flags & cur->code ) == 0 )
1505 continue;
1506
1507 ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string );
1508 MBEDTLS_X509_SAFE_SNPRINTF;
1509 flags ^= cur->code;
1510 }
1511
1512 if( flags != 0 )
1513 {
1514 ret = mbedtls_snprintf( p, n, "%sUnknown reason "
1515 "(this should not happen)\n", prefix );
1516 MBEDTLS_X509_SAFE_SNPRINTF;
1517 }
1518
1519 return( (int) ( size - n ) );
1520 }
1521
1522 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
1523 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt,
1524 unsigned int usage )
1525 {
1526 unsigned int usage_must, usage_may;
1527 unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY
1528 | MBEDTLS_X509_KU_DECIPHER_ONLY;
1529
1530 if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 )
1531 return( 0 );
1532
1533 usage_must = usage & ~may_mask;
1534
1535 if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must )
1536 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1537
1538 usage_may = usage & may_mask;
1539
1540 if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may )
1541 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1542
1543 return( 0 );
1544 }
1545 #endif
1546
1547 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
1548 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt,
1549 const char *usage_oid,
1550 size_t usage_len )
1551 {
1552 const mbedtls_x509_sequence *cur;
1553
1554 /* Extension is not mandatory, absent means no restriction */
1555 if( ( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 )
1556 return( 0 );
1557
1558 /*
1559 * Look for the requested usage (or wildcard ANY) in our list
1560 */
1561 for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next )
1562 {
1563 const mbedtls_x509_buf *cur_oid = &cur->buf;
1564
1565 if( cur_oid->len == usage_len &&
1566 memcmp( cur_oid->p, usage_oid, usage_len ) == 0 )
1567 {
1568 return( 0 );
1569 }
1570
1571 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 )
1572 return( 0 );
1573 }
1574
1575 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
1576 }
1577 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */
1578
1579 #if defined(MBEDTLS_X509_CRL_PARSE_C)
1580 /*
1581 * Return 1 if the certificate is revoked, or 0 otherwise.
1582 */
1583 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl )
1584 {
1585 const mbedtls_x509_crl_entry *cur = &crl->entry;
1586
1587 while( cur != NULL && cur->serial.len != 0 )
1588 {
1589 if( crt->serial.len == cur->serial.len &&
1590 memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 )
1591 {
1592 if( mbedtls_x509_time_is_past( &cur->revocation_date ) )
1593 return( 1 );
1594 }
1595
1596 cur = cur->next;
1597 }
1598
1599 return( 0 );
1600 }
1601
1602 /*
1603 * Check that the given certificate is valid according to the CRL.
1604 */
1605 static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca,
1606 mbedtls_x509_crl *crl_list,
1607 const mbedtls_x509_crt_profile *profile )
1608 {
1609 int flags = 0;
1610 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
1611 const mbedtls_md_info_t *md_info;
1612
1613 if( ca == NULL )
1614 return( flags );
1615
1616 /*
1617 * TODO: What happens if no CRL is present?
1618 * Suggestion: Revocation state should be unknown if no CRL is present.
1619 * For backwards compatibility this is not yet implemented.
1620 */
1621
1622 while( crl_list != NULL )
1623 {
1624 if( crl_list->version == 0 ||
1625 crl_list->issuer_raw.len != ca->subject_raw.len ||
1626 memcmp( crl_list->issuer_raw.p, ca->subject_raw.p,
1627 crl_list->issuer_raw.len ) != 0 )
1628 {
1629 crl_list = crl_list->next;
1630 continue;
1631 }
1632
1633 /*
1634 * Check if the CA is configured to sign CRLs
1635 */
1636 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
1637 if( mbedtls_x509_crt_check_key_usage( ca, MBEDTLS_X509_KU_CRL_SIGN ) != 0 )
1638 {
1639 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
1640 break;
1641 }
1642 #endif
1643
1644 /*
1645 * Check if CRL is correctly signed by the trusted CA
1646 */
1647 if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 )
1648 flags |= MBEDTLS_X509_BADCRL_BAD_MD;
1649
1650 if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 )
1651 flags |= MBEDTLS_X509_BADCRL_BAD_PK;
1652
1653 md_info = mbedtls_md_info_from_type( crl_list->sig_md );
1654 if( md_info == NULL )
1655 {
1656 /*
1657 * Cannot check 'unknown' hash
1658 */
1659 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
1660 break;
1661 }
1662
1663 mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash );
1664
1665 if( x509_profile_check_key( profile, crl_list->sig_pk, &ca->pk ) != 0 )
1666 flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
1667
1668 if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk,
1669 crl_list->sig_md, hash, mbedtls_md_get_size( md_info ),
1670 crl_list->sig.p, crl_list->sig.len ) != 0 )
1671 {
1672 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED;
1673 break;
1674 }
1675
1676 /*
1677 * Check for validity of CRL (Do not drop out)
1678 */
1679 if( mbedtls_x509_time_is_past( &crl_list->next_update ) )
1680 flags |= MBEDTLS_X509_BADCRL_EXPIRED;
1681
1682 if( mbedtls_x509_time_is_future( &crl_list->this_update ) )
1683 flags |= MBEDTLS_X509_BADCRL_FUTURE;
1684
1685 /*
1686 * Check if certificate is revoked
1687 */
1688 if( mbedtls_x509_crt_is_revoked( crt, crl_list ) )
1689 {
1690 flags |= MBEDTLS_X509_BADCERT_REVOKED;
1691 break;
1692 }
1693
1694 crl_list = crl_list->next;
1695 }
1696
1697 return( flags );
1698 }
1699 #endif /* MBEDTLS_X509_CRL_PARSE_C */
1700
1701 /*
1702 * Like memcmp, but case-insensitive and always returns -1 if different
1703 */
1704 static int x509_memcasecmp( const void *s1, const void *s2, size_t len )
1705 {
1706 size_t i;
1707 unsigned char diff;
1708 const unsigned char *n1 = s1, *n2 = s2;
1709
1710 for( i = 0; i < len; i++ )
1711 {
1712 diff = n1[i] ^ n2[i];
1713
1714 if( diff == 0 )
1715 continue;
1716
1717 if( diff == 32 &&
1718 ( ( n1[i] >= 'a' && n1[i] <= 'z' ) ||
1719 ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) )
1720 {
1721 continue;
1722 }
1723
1724 return( -1 );
1725 }
1726
1727 return( 0 );
1728 }
1729
1730 /*
1731 * Return 0 if name matches wildcard, -1 otherwise
1732 */
1733 static int x509_check_wildcard( const char *cn, mbedtls_x509_buf *name )
1734 {
1735 size_t i;
1736 size_t cn_idx = 0, cn_len = strlen( cn );
1737
1738 if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' )
1739 return( 0 );
1740
1741 for( i = 0; i < cn_len; ++i )
1742 {
1743 if( cn[i] == '.' )
1744 {
1745 cn_idx = i;
1746 break;
1747 }
1748 }
1749
1750 if( cn_idx == 0 )
1751 return( -1 );
1752
1753 if( cn_len - cn_idx == name->len - 1 &&
1754 x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 )
1755 {
1756 return( 0 );
1757 }
1758
1759 return( -1 );
1760 }
1761
1762 /*
1763 * Compare two X.509 strings, case-insensitive, and allowing for some encoding
1764 * variations (but not all).
1765 *
1766 * Return 0 if equal, -1 otherwise.
1767 */
1768 static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b )
1769 {
1770 if( a->tag == b->tag &&
1771 a->len == b->len &&
1772 memcmp( a->p, b->p, b->len ) == 0 )
1773 {
1774 return( 0 );
1775 }
1776
1777 if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
1778 ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) &&
1779 a->len == b->len &&
1780 x509_memcasecmp( a->p, b->p, b->len ) == 0 )
1781 {
1782 return( 0 );
1783 }
1784
1785 return( -1 );
1786 }
1787
1788 /*
1789 * Compare two X.509 Names (aka rdnSequence).
1790 *
1791 * See RFC 5280 section 7.1, though we don't implement the whole algorithm:
1792 * we sometimes return unequal when the full algorithm would return equal,
1793 * but never the other way. (In particular, we don't do Unicode normalisation
1794 * or space folding.)
1795 *
1796 * Return 0 if equal, -1 otherwise.
1797 */
1798 static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b )
1799 {
1800 /* Avoid recursion, it might not be optimised by the compiler */
1801 while( a != NULL || b != NULL )
1802 {
1803 if( a == NULL || b == NULL )
1804 return( -1 );
1805
1806 /* type */
1807 if( a->oid.tag != b->oid.tag ||
1808 a->oid.len != b->oid.len ||
1809 memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 )
1810 {
1811 return( -1 );
1812 }
1813
1814 /* value */
1815 if( x509_string_cmp( &a->val, &b->val ) != 0 )
1816 return( -1 );
1817
1818 /* structure of the list of sets */
1819 if( a->next_merged != b->next_merged )
1820 return( -1 );
1821
1822 a = a->next;
1823 b = b->next;
1824 }
1825
1826 /* a == NULL == b */
1827 return( 0 );
1828 }
1829
1830 /*
1831 * Check if 'parent' is a suitable parent (signing CA) for 'child'.
1832 * Return 0 if yes, -1 if not.
1833 *
1834 * top means parent is a locally-trusted certificate
1835 * bottom means child is the end entity cert
1836 */
1837 static int x509_crt_check_parent( const mbedtls_x509_crt *child,
1838 const mbedtls_x509_crt *parent,
1839 int top, int bottom )
1840 {
1841 int need_ca_bit;
1842
1843 /* Parent must be the issuer */
1844 if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 )
1845 return( -1 );
1846
1847 /* Parent must have the basicConstraints CA bit set as a general rule */
1848 need_ca_bit = 1;
1849
1850 /* Exception: v1/v2 certificates that are locally trusted. */
1851 if( top && parent->version < 3 )
1852 need_ca_bit = 0;
1853
1854 /* Exception: self-signed end-entity certs that are locally trusted. */
1855 if( top && bottom &&
1856 child->raw.len == parent->raw.len &&
1857 memcmp( child->raw.p, parent->raw.p, child->raw.len ) == 0 )
1858 {
1859 need_ca_bit = 0;
1860 }
1861
1862 if( need_ca_bit && ! parent->ca_istrue )
1863 return( -1 );
1864
1865 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE)
1866 if( need_ca_bit &&
1867 mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 )
1868 {
1869 return( -1 );
1870 }
1871 #endif
1872
1873 return( 0 );
1874 }
1875
1876 static int x509_crt_verify_top(
1877 mbedtls_x509_crt *child, mbedtls_x509_crt *trust_ca,
1878 mbedtls_x509_crl *ca_crl,
1879 const mbedtls_x509_crt_profile *profile,
1880 int path_cnt, int self_cnt, uint32_t *flags,
1881 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
1882 void *p_vrfy )
1883 {
1884 int ret;
1885 uint32_t ca_flags = 0;
1886 int check_path_cnt;
1887 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
1888 const mbedtls_md_info_t *md_info;
1889
1890 if( mbedtls_x509_time_is_past( &child->valid_to ) )
1891 *flags |= MBEDTLS_X509_BADCERT_EXPIRED;
1892
1893 if( mbedtls_x509_time_is_future( &child->valid_from ) )
1894 *flags |= MBEDTLS_X509_BADCERT_FUTURE;
1895
1896 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
1897 *flags |= MBEDTLS_X509_BADCERT_BAD_MD;
1898
1899 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
1900 *flags |= MBEDTLS_X509_BADCERT_BAD_PK;
1901
1902 /*
1903 * Child is the top of the chain. Check against the trust_ca list.
1904 */
1905 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
1906
1907 md_info = mbedtls_md_info_from_type( child->sig_md );
1908 if( md_info == NULL )
1909 {
1910 /*
1911 * Cannot check 'unknown', no need to try any CA
1912 */
1913 trust_ca = NULL;
1914 }
1915 else
1916 mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash );
1917
1918 for( /* trust_ca */ ; trust_ca != NULL; trust_ca = trust_ca->next )
1919 {
1920 if( x509_crt_check_parent( child, trust_ca, 1, path_cnt == 0 ) != 0 )
1921 continue;
1922
1923 check_path_cnt = path_cnt + 1;
1924
1925 /*
1926 * Reduce check_path_cnt to check against if top of the chain is
1927 * the same as the trusted CA
1928 */
1929 if( child->subject_raw.len == trust_ca->subject_raw.len &&
1930 memcmp( child->subject_raw.p, trust_ca->subject_raw.p,
1931 child->issuer_raw.len ) == 0 )
1932 {
1933 check_path_cnt--;
1934 }
1935
1936 /* Self signed certificates do not count towards the limit */
1937 if( trust_ca->max_pathlen > 0 &&
1938 trust_ca->max_pathlen < check_path_cnt - self_cnt )
1939 {
1940 continue;
1941 }
1942
1943 if( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &trust_ca->pk,
1944 child->sig_md, hash, mbedtls_md_get_size( md_info ),
1945 child->sig.p, child->sig.len ) != 0 )
1946 {
1947 continue;
1948 }
1949
1950 /*
1951 * Top of chain is signed by a trusted CA
1952 */
1953 *flags &= ~MBEDTLS_X509_BADCERT_NOT_TRUSTED;
1954
1955 if( x509_profile_check_key( profile, child->sig_pk, &trust_ca->pk ) != 0 )
1956 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
1957
1958 break;
1959 }
1960
1961 /*
1962 * If top of chain is not the same as the trusted CA send a verify request
1963 * to the callback for any issues with validity and CRL presence for the
1964 * trusted CA certificate.
1965 */
1966 if( trust_ca != NULL &&
1967 ( child->subject_raw.len != trust_ca->subject_raw.len ||
1968 memcmp( child->subject_raw.p, trust_ca->subject_raw.p,
1969 child->issuer_raw.len ) != 0 ) )
1970 {
1971 #if defined(MBEDTLS_X509_CRL_PARSE_C)
1972 /* Check trusted CA's CRL for the chain's top crt */
1973 *flags |= x509_crt_verifycrl( child, trust_ca, ca_crl, profile );
1974 #else
1975 ((void) ca_crl);
1976 #endif
1977
1978 if( mbedtls_x509_time_is_past( &trust_ca->valid_to ) )
1979 ca_flags |= MBEDTLS_X509_BADCERT_EXPIRED;
1980
1981 if( mbedtls_x509_time_is_future( &trust_ca->valid_from ) )
1982 ca_flags |= MBEDTLS_X509_BADCERT_FUTURE;
1983
1984 if( NULL != f_vrfy )
1985 {
1986 if( ( ret = f_vrfy( p_vrfy, trust_ca, path_cnt + 1,
1987 &ca_flags ) ) != 0 )
1988 {
1989 return( ret );
1990 }
1991 }
1992 }
1993
1994 /* Call callback on top cert */
1995 if( NULL != f_vrfy )
1996 {
1997 if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 )
1998 return( ret );
1999 }
2000
2001 *flags |= ca_flags;
2002
2003 return( 0 );
2004 }
2005
2006 static int x509_crt_verify_child(
2007 mbedtls_x509_crt *child, mbedtls_x509_crt *parent,
2008 mbedtls_x509_crt *trust_ca, mbedtls_x509_crl *ca_crl,
2009 const mbedtls_x509_crt_profile *profile,
2010 int path_cnt, int self_cnt, uint32_t *flags,
2011 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
2012 void *p_vrfy )
2013 {
2014 int ret;
2015 uint32_t parent_flags = 0;
2016 unsigned char hash[MBEDTLS_MD_MAX_SIZE];
2017 mbedtls_x509_crt *grandparent;
2018 const mbedtls_md_info_t *md_info;
2019
2020 /* Counting intermediate self signed certificates */
2021 if( ( path_cnt != 0 ) && x509_name_cmp( &child->issuer, &child->subject ) == 0 )
2022 self_cnt++;
2023
2024 /* path_cnt is 0 for the first intermediate CA */
2025 if( 1 + path_cnt > MBEDTLS_X509_MAX_INTERMEDIATE_CA )
2026 {
2027 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2028 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED );
2029 }
2030
2031 if( mbedtls_x509_time_is_past( &child->valid_to ) )
2032 *flags |= MBEDTLS_X509_BADCERT_EXPIRED;
2033
2034 if( mbedtls_x509_time_is_future( &child->valid_from ) )
2035 *flags |= MBEDTLS_X509_BADCERT_FUTURE;
2036
2037 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 )
2038 *flags |= MBEDTLS_X509_BADCERT_BAD_MD;
2039
2040 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 )
2041 *flags |= MBEDTLS_X509_BADCERT_BAD_PK;
2042
2043 md_info = mbedtls_md_info_from_type( child->sig_md );
2044 if( md_info == NULL )
2045 {
2046 /*
2047 * Cannot check 'unknown' hash
2048 */
2049 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2050 }
2051 else
2052 {
2053 mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash );
2054
2055 if( x509_profile_check_key( profile, child->sig_pk, &parent->pk ) != 0 )
2056 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
2057
2058 if( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk,
2059 child->sig_md, hash, mbedtls_md_get_size( md_info ),
2060 child->sig.p, child->sig.len ) != 0 )
2061 {
2062 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED;
2063 }
2064 }
2065
2066 #if defined(MBEDTLS_X509_CRL_PARSE_C)
2067 /* Check trusted CA's CRL for the given crt */
2068 *flags |= x509_crt_verifycrl(child, parent, ca_crl, profile );
2069 #endif
2070
2071 /* Look for a grandparent in trusted CAs */
2072 for( grandparent = trust_ca;
2073 grandparent != NULL;
2074 grandparent = grandparent->next )
2075 {
2076 if( x509_crt_check_parent( parent, grandparent,
2077 0, path_cnt == 0 ) == 0 )
2078 break;
2079 }
2080
2081 if( grandparent != NULL )
2082 {
2083 ret = x509_crt_verify_top( parent, grandparent, ca_crl, profile,
2084 path_cnt + 1, self_cnt, &parent_flags, f_vrfy, p_vrfy );
2085 if( ret != 0 )
2086 return( ret );
2087 }
2088 else
2089 {
2090 /* Look for a grandparent upwards the chain */
2091 for( grandparent = parent->next;
2092 grandparent != NULL;
2093 grandparent = grandparent->next )
2094 {
2095 /* +2 because the current step is not yet accounted for
2096 * and because max_pathlen is one higher than it should be.
2097 * Also self signed certificates do not count to the limit. */
2098 if( grandparent->max_pathlen > 0 &&
2099 grandparent->max_pathlen < 2 + path_cnt - self_cnt )
2100 {
2101 continue;
2102 }
2103
2104 if( x509_crt_check_parent( parent, grandparent,
2105 0, path_cnt == 0 ) == 0 )
2106 break;
2107 }
2108
2109 /* Is our parent part of the chain or at the top? */
2110 if( grandparent != NULL )
2111 {
2112 ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl,
2113 profile, path_cnt + 1, self_cnt, &parent_flags,
2114 f_vrfy, p_vrfy );
2115 if( ret != 0 )
2116 return( ret );
2117 }
2118 else
2119 {
2120 ret = x509_crt_verify_top( parent, trust_ca, ca_crl, profile,
2121 path_cnt + 1, self_cnt, &parent_flags,
2122 f_vrfy, p_vrfy );
2123 if( ret != 0 )
2124 return( ret );
2125 }
2126 }
2127
2128 /* child is verified to be a child of the parent, call verify callback */
2129 if( NULL != f_vrfy )
2130 if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 )
2131 return( ret );
2132
2133 *flags |= parent_flags;
2134
2135 return( 0 );
2136 }
2137
2138 /*
2139 * Verify the certificate validity
2140 */
2141 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt,
2142 mbedtls_x509_crt *trust_ca,
2143 mbedtls_x509_crl *ca_crl,
2144 const char *cn, uint32_t *flags,
2145 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
2146 void *p_vrfy )
2147 {
2148 return( mbedtls_x509_crt_verify_with_profile( crt, trust_ca, ca_crl,
2149 &mbedtls_x509_crt_profile_default, cn, flags, f_vrfy, p_vrfy ) );
2150 }
2151
2152
2153 /*
2154 * Verify the certificate validity, with profile
2155 */
2156 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt,
2157 mbedtls_x509_crt *trust_ca,
2158 mbedtls_x509_crl *ca_crl,
2159 const mbedtls_x509_crt_profile *profile,
2160 const char *cn, uint32_t *flags,
2161 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *),
2162 void *p_vrfy )
2163 {
2164 size_t cn_len;
2165 int ret;
2166 int pathlen = 0, selfsigned = 0;
2167 mbedtls_x509_crt *parent;
2168 mbedtls_x509_name *name;
2169 mbedtls_x509_sequence *cur = NULL;
2170 mbedtls_pk_type_t pk_type;
2171
2172 if( profile == NULL )
2173 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA );
2174
2175 *flags = 0;
2176
2177 if( cn != NULL )
2178 {
2179 name = &crt->subject;
2180 cn_len = strlen( cn );
2181
2182 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME )
2183 {
2184 cur = &crt->subject_alt_names;
2185
2186 while( cur != NULL )
2187 {
2188 if( cur->buf.len == cn_len &&
2189 x509_memcasecmp( cn, cur->buf.p, cn_len ) == 0 )
2190 break;
2191
2192 if( cur->buf.len > 2 &&
2193 memcmp( cur->buf.p, "*.", 2 ) == 0 &&
2194 x509_check_wildcard( cn, &cur->buf ) == 0 )
2195 {
2196 break;
2197 }
2198
2199 cur = cur->next;
2200 }
2201
2202 if( cur == NULL )
2203 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
2204 }
2205 else
2206 {
2207 while( name != NULL )
2208 {
2209 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 )
2210 {
2211 if( name->val.len == cn_len &&
2212 x509_memcasecmp( name->val.p, cn, cn_len ) == 0 )
2213 break;
2214
2215 if( name->val.len > 2 &&
2216 memcmp( name->val.p, "*.", 2 ) == 0 &&
2217 x509_check_wildcard( cn, &name->val ) == 0 )
2218 break;
2219 }
2220
2221 name = name->next;
2222 }
2223
2224 if( name == NULL )
2225 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH;
2226 }
2227 }
2228
2229 /* Check the type and size of the key */
2230 pk_type = mbedtls_pk_get_type( &crt->pk );
2231
2232 if( x509_profile_check_pk_alg( profile, pk_type ) != 0 )
2233 *flags |= MBEDTLS_X509_BADCERT_BAD_PK;
2234
2235 if( x509_profile_check_key( profile, pk_type, &crt->pk ) != 0 )
2236 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY;
2237
2238 /* Look for a parent in trusted CAs */
2239 for( parent = trust_ca; parent != NULL; parent = parent->next )
2240 {
2241 if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 )
2242 break;
2243 }
2244
2245 if( parent != NULL )
2246 {
2247 ret = x509_crt_verify_top( crt, parent, ca_crl, profile,
2248 pathlen, selfsigned, flags, f_vrfy, p_vrfy );
2249 if( ret != 0 )
2250 return( ret );
2251 }
2252 else
2253 {
2254 /* Look for a parent upwards the chain */
2255 for( parent = crt->next; parent != NULL; parent = parent->next )
2256 if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 )
2257 break;
2258
2259 /* Are we part of the chain or at the top? */
2260 if( parent != NULL )
2261 {
2262 ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, profile,
2263 pathlen, selfsigned, flags, f_vrfy, p_vrfy );
2264 if( ret != 0 )
2265 return( ret );
2266 }
2267 else
2268 {
2269 ret = x509_crt_verify_top( crt, trust_ca, ca_crl, profile,
2270 pathlen, selfsigned, flags, f_vrfy, p_vrfy );
2271 if( ret != 0 )
2272 return( ret );
2273 }
2274 }
2275
2276 if( *flags != 0 )
2277 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED );
2278
2279 return( 0 );
2280 }
2281
2282 /*
2283 * Initialize a certificate chain
2284 */
2285 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt )
2286 {
2287 memset( crt, 0, sizeof(mbedtls_x509_crt) );
2288 }
2289
2290 /*
2291 * Unallocate all certificate data
2292 */
2293 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt )
2294 {
2295 mbedtls_x509_crt *cert_cur = crt;
2296 mbedtls_x509_crt *cert_prv;
2297 mbedtls_x509_name *name_cur;
2298 mbedtls_x509_name *name_prv;
2299 mbedtls_x509_sequence *seq_cur;
2300 mbedtls_x509_sequence *seq_prv;
2301
2302 if( crt == NULL )
2303 return;
2304
2305 do
2306 {
2307 mbedtls_pk_free( &cert_cur->pk );
2308
2309 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT)
2310 mbedtls_free( cert_cur->sig_opts );
2311 #endif
2312
2313 name_cur = cert_cur->issuer.next;
2314 while( name_cur != NULL )
2315 {
2316 name_prv = name_cur;
2317 name_cur = name_cur->next;
2318 mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
2319 mbedtls_free( name_prv );
2320 }
2321
2322 name_cur = cert_cur->subject.next;
2323 while( name_cur != NULL )
2324 {
2325 name_prv = name_cur;
2326 name_cur = name_cur->next;
2327 mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) );
2328 mbedtls_free( name_prv );
2329 }
2330
2331 seq_cur = cert_cur->ext_key_usage.next;
2332 while( seq_cur != NULL )
2333 {
2334 seq_prv = seq_cur;
2335 seq_cur = seq_cur->next;
2336 mbedtls_zeroize( seq_prv, sizeof( mbedtls_x509_sequence ) );
2337 mbedtls_free( seq_prv );
2338 }
2339
2340 seq_cur = cert_cur->subject_alt_names.next;
2341 while( seq_cur != NULL )
2342 {
2343 seq_prv = seq_cur;
2344 seq_cur = seq_cur->next;
2345 mbedtls_zeroize( seq_prv, sizeof( mbedtls_x509_sequence ) );
2346 mbedtls_free( seq_prv );
2347 }
2348
2349 if( cert_cur->raw.p != NULL )
2350 {
2351 mbedtls_zeroize( cert_cur->raw.p, cert_cur->raw.len );
2352 mbedtls_free( cert_cur->raw.p );
2353 }
2354
2355 cert_cur = cert_cur->next;
2356 }
2357 while( cert_cur != NULL );
2358
2359 cert_cur = crt;
2360 do
2361 {
2362 cert_prv = cert_cur;
2363 cert_cur = cert_cur->next;
2364
2365 mbedtls_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) );
2366 if( cert_prv != crt )
2367 mbedtls_free( cert_prv );
2368 }
2369 while( cert_cur != NULL );
2370 }
2371
2372 #endif /* MBEDTLS_X509_CRT_PARSE_C */
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