1 // SPDX-License-Identifier: Apache-2.0 2 /* 3 * X.509 certificate parsing and verification 4 * 5 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved 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 * [SIRO] https://cabforum.org/wp-content/uploads/Chunghwatelecom201503cabforumV4.pdf 32 */ 33 34 #if !defined(MBEDTLS_CONFIG_FILE) 35 #include "mbedtls/config.h" 36 #else 37 #include MBEDTLS_CONFIG_FILE 38 #endif 39 40 #if defined(MBEDTLS_X509_CRT_PARSE_C) 41 42 #include "mbedtls/x509_crt.h" 43 #include "mbedtls/oid.h" 44 #include "mbedtls/platform_util.h" 45 46 #include <string.h> 47 48 #if defined(MBEDTLS_PEM_PARSE_C) 49 #include "mbedtls/pem.h" 50 #endif 51 52 #if defined(MBEDTLS_PLATFORM_C) 53 #include "mbedtls/platform.h" 54 #else 55 #include <stdio.h> 56 #include <stdlib.h> 57 #define mbedtls_free free 58 #define mbedtls_calloc calloc 59 #define mbedtls_snprintf snprintf 60 #endif 61 62 #if defined(MBEDTLS_THREADING_C) 63 #include "mbedtls/threading.h" 64 #endif 65 66 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) 67 #include <windows.h> 68 #else 69 #include <time.h> 70 #endif 71 72 #if defined(MBEDTLS_FS_IO) 73 #include <stdio.h> 74 #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32) 75 #include <sys/types.h> 76 #include <sys/stat.h> 77 #include <dirent.h> 78 #endif /* !_WIN32 || EFIX64 || EFI32 */ 79 #endif 80 81 /* 82 * Item in a verification chain: cert and flags for it 83 */ 84 typedef struct { 85 mbedtls_x509_crt *crt; 86 uint32_t flags; 87 } x509_crt_verify_chain_item; 88 89 /* 90 * Max size of verification chain: end-entity + intermediates + trusted root 91 */ 92 #define X509_MAX_VERIFY_CHAIN_SIZE ( MBEDTLS_X509_MAX_INTERMEDIATE_CA + 2 ) 93 94 /* 95 * Default profile 96 */ 97 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default = 98 { 99 #if defined(MBEDTLS_TLS_DEFAULT_ALLOW_SHA1_IN_CERTIFICATES) 100 /* Allow SHA-1 (weak, but still safe in controlled environments) */ 101 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) | 102 #endif 103 /* Only SHA-2 hashes */ 104 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) | 105 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | 106 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | 107 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), 108 0xFFFFFFF, /* Any PK alg */ 109 0xFFFFFFF, /* Any curve */ 110 2048, 111 }; 112 113 /* 114 * Next-default profile 115 */ 116 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next = 117 { 118 /* Hashes from SHA-256 and above */ 119 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | 120 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | 121 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), 122 0xFFFFFFF, /* Any PK alg */ 123 #if defined(MBEDTLS_ECP_C) 124 /* Curves at or above 128-bit security level */ 125 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | 126 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) | 127 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) | 128 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) | 129 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) | 130 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) | 131 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ), 132 #else 133 0, 134 #endif 135 2048, 136 }; 137 138 /* 139 * NSA Suite B Profile 140 */ 141 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb = 142 { 143 /* Only SHA-256 and 384 */ 144 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | 145 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ), 146 /* Only ECDSA */ 147 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ) | 148 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECKEY ), 149 #if defined(MBEDTLS_ECP_C) 150 /* Only NIST P-256 and P-384 */ 151 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | 152 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ), 153 #else 154 0, 155 #endif 156 0, 157 }; 158 159 /* 160 * Check md_alg against profile 161 * Return 0 if md_alg is acceptable for this profile, -1 otherwise 162 */ 163 static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile, 164 mbedtls_md_type_t md_alg ) 165 { 166 if( md_alg == MBEDTLS_MD_NONE ) 167 return( -1 ); 168 169 if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 ) 170 return( 0 ); 171 172 return( -1 ); 173 } 174 175 /* 176 * Check pk_alg against profile 177 * Return 0 if pk_alg is acceptable for this profile, -1 otherwise 178 */ 179 static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile, 180 mbedtls_pk_type_t pk_alg ) 181 { 182 if( pk_alg == MBEDTLS_PK_NONE ) 183 return( -1 ); 184 185 if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 ) 186 return( 0 ); 187 188 return( -1 ); 189 } 190 191 /* 192 * Check key against profile 193 * Return 0 if pk is acceptable for this profile, -1 otherwise 194 */ 195 static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile, 196 const mbedtls_pk_context *pk ) 197 { 198 const mbedtls_pk_type_t pk_alg = mbedtls_pk_get_type( pk ); 199 200 #if defined(MBEDTLS_RSA_C) 201 if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS ) 202 { 203 if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen ) 204 return( 0 ); 205 206 return( -1 ); 207 } 208 #endif 209 210 #if defined(MBEDTLS_ECP_C) 211 if( pk_alg == MBEDTLS_PK_ECDSA || 212 pk_alg == MBEDTLS_PK_ECKEY || 213 pk_alg == MBEDTLS_PK_ECKEY_DH ) 214 { 215 const mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp.id; 216 217 if( gid == MBEDTLS_ECP_DP_NONE ) 218 return( -1 ); 219 220 if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 ) 221 return( 0 ); 222 223 return( -1 ); 224 } 225 #endif 226 227 return( -1 ); 228 } 229 230 /* 231 * Like memcmp, but case-insensitive and always returns -1 if different 232 */ 233 static int x509_memcasecmp( const void *s1, const void *s2, size_t len ) 234 { 235 size_t i; 236 unsigned char diff; 237 const unsigned char *n1 = s1, *n2 = s2; 238 239 for( i = 0; i < len; i++ ) 240 { 241 diff = n1[i] ^ n2[i]; 242 243 if( diff == 0 ) 244 continue; 245 246 if( diff == 32 && 247 ( ( n1[i] >= 'a' && n1[i] <= 'z' ) || 248 ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) ) 249 { 250 continue; 251 } 252 253 return( -1 ); 254 } 255 256 return( 0 ); 257 } 258 259 /* 260 * Return 0 if name matches wildcard, -1 otherwise 261 */ 262 static int x509_check_wildcard( const char *cn, const mbedtls_x509_buf *name ) 263 { 264 size_t i; 265 size_t cn_idx = 0, cn_len = strlen( cn ); 266 267 /* We can't have a match if there is no wildcard to match */ 268 if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' ) 269 return( -1 ); 270 271 for( i = 0; i < cn_len; ++i ) 272 { 273 if( cn[i] == '.' ) 274 { 275 cn_idx = i; 276 break; 277 } 278 } 279 280 if( cn_idx == 0 ) 281 return( -1 ); 282 283 if( cn_len - cn_idx == name->len - 1 && 284 x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 ) 285 { 286 return( 0 ); 287 } 288 289 return( -1 ); 290 } 291 292 /* 293 * Compare two X.509 strings, case-insensitive, and allowing for some encoding 294 * variations (but not all). 295 * 296 * Return 0 if equal, -1 otherwise. 297 */ 298 static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b ) 299 { 300 if( a->tag == b->tag && 301 a->len == b->len && 302 memcmp( a->p, b->p, b->len ) == 0 ) 303 { 304 return( 0 ); 305 } 306 307 if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && 308 ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && 309 a->len == b->len && 310 x509_memcasecmp( a->p, b->p, b->len ) == 0 ) 311 { 312 return( 0 ); 313 } 314 315 return( -1 ); 316 } 317 318 /* 319 * Compare two X.509 Names (aka rdnSequence). 320 * 321 * See RFC 5280 section 7.1, though we don't implement the whole algorithm: 322 * we sometimes return unequal when the full algorithm would return equal, 323 * but never the other way. (In particular, we don't do Unicode normalisation 324 * or space folding.) 325 * 326 * Return 0 if equal, -1 otherwise. 327 */ 328 static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b ) 329 { 330 /* Avoid recursion, it might not be optimised by the compiler */ 331 while( a != NULL || b != NULL ) 332 { 333 if( a == NULL || b == NULL ) 334 return( -1 ); 335 336 /* type */ 337 if( a->oid.tag != b->oid.tag || 338 a->oid.len != b->oid.len || 339 memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 ) 340 { 341 return( -1 ); 342 } 343 344 /* value */ 345 if( x509_string_cmp( &a->val, &b->val ) != 0 ) 346 return( -1 ); 347 348 /* structure of the list of sets */ 349 if( a->next_merged != b->next_merged ) 350 return( -1 ); 351 352 a = a->next; 353 b = b->next; 354 } 355 356 /* a == NULL == b */ 357 return( 0 ); 358 } 359 360 /* 361 * Reset (init or clear) a verify_chain 362 */ 363 static void x509_crt_verify_chain_reset( 364 mbedtls_x509_crt_verify_chain *ver_chain ) 365 { 366 size_t i; 367 368 for( i = 0; i < MBEDTLS_X509_MAX_VERIFY_CHAIN_SIZE; i++ ) 369 { 370 ver_chain->items[i].crt = NULL; 371 ver_chain->items[i].flags = (uint32_t) -1; 372 } 373 374 ver_chain->len = 0; 375 } 376 377 /* 378 * Version ::= INTEGER { v1(0), v2(1), v3(2) } 379 */ 380 static int x509_get_version( unsigned char **p, 381 const unsigned char *end, 382 int *ver ) 383 { 384 int ret; 385 size_t len; 386 387 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 388 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 ) 389 { 390 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) 391 { 392 *ver = 0; 393 return( 0 ); 394 } 395 396 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 397 } 398 399 end = *p + len; 400 401 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 ) 402 return( MBEDTLS_ERR_X509_INVALID_VERSION + ret ); 403 404 if( *p != end ) 405 return( MBEDTLS_ERR_X509_INVALID_VERSION + 406 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 407 408 return( 0 ); 409 } 410 411 /* 412 * Validity ::= SEQUENCE { 413 * notBefore Time, 414 * notAfter Time } 415 */ 416 static int x509_get_dates( unsigned char **p, 417 const unsigned char *end, 418 mbedtls_x509_time *from, 419 mbedtls_x509_time *to ) 420 { 421 int ret; 422 size_t len; 423 424 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 425 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 426 return( MBEDTLS_ERR_X509_INVALID_DATE + ret ); 427 428 end = *p + len; 429 430 if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 ) 431 return( ret ); 432 433 if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 ) 434 return( ret ); 435 436 if( *p != end ) 437 return( MBEDTLS_ERR_X509_INVALID_DATE + 438 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 439 440 return( 0 ); 441 } 442 443 /* 444 * X.509 v2/v3 unique identifier (not parsed) 445 */ 446 static int x509_get_uid( unsigned char **p, 447 const unsigned char *end, 448 mbedtls_x509_buf *uid, int n ) 449 { 450 int ret; 451 452 if( *p == end ) 453 return( 0 ); 454 455 uid->tag = **p; 456 457 if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len, 458 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 ) 459 { 460 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) 461 return( 0 ); 462 463 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 464 } 465 466 uid->p = *p; 467 *p += uid->len; 468 469 return( 0 ); 470 } 471 472 static int x509_get_basic_constraints( unsigned char **p, 473 const unsigned char *end, 474 int *ca_istrue, 475 int *max_pathlen ) 476 { 477 int ret; 478 size_t len; 479 480 /* 481 * BasicConstraints ::= SEQUENCE { 482 * cA BOOLEAN DEFAULT FALSE, 483 * pathLenConstraint INTEGER (0..MAX) OPTIONAL } 484 */ 485 *ca_istrue = 0; /* DEFAULT FALSE */ 486 *max_pathlen = 0; /* endless */ 487 488 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 489 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 490 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 491 492 if( *p == end ) 493 return( 0 ); 494 495 if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 ) 496 { 497 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) 498 ret = mbedtls_asn1_get_int( p, end, ca_istrue ); 499 500 if( ret != 0 ) 501 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 502 503 if( *ca_istrue != 0 ) 504 *ca_istrue = 1; 505 } 506 507 if( *p == end ) 508 return( 0 ); 509 510 if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 ) 511 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 512 513 if( *p != end ) 514 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 515 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 516 517 (*max_pathlen)++; 518 519 return( 0 ); 520 } 521 522 static int x509_get_ns_cert_type( unsigned char **p, 523 const unsigned char *end, 524 unsigned char *ns_cert_type) 525 { 526 int ret; 527 mbedtls_x509_bitstring bs = { 0, 0, NULL }; 528 529 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) 530 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 531 532 if( bs.len != 1 ) 533 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 534 MBEDTLS_ERR_ASN1_INVALID_LENGTH ); 535 536 /* Get actual bitstring */ 537 *ns_cert_type = *bs.p; 538 return( 0 ); 539 } 540 541 static int x509_get_key_usage( unsigned char **p, 542 const unsigned char *end, 543 unsigned int *key_usage) 544 { 545 int ret; 546 size_t i; 547 mbedtls_x509_bitstring bs = { 0, 0, NULL }; 548 549 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) 550 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 551 552 if( bs.len < 1 ) 553 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 554 MBEDTLS_ERR_ASN1_INVALID_LENGTH ); 555 556 /* Get actual bitstring */ 557 *key_usage = 0; 558 for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ ) 559 { 560 *key_usage |= (unsigned int) bs.p[i] << (8*i); 561 } 562 563 return( 0 ); 564 } 565 566 /* 567 * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId 568 * 569 * KeyPurposeId ::= OBJECT IDENTIFIER 570 */ 571 static int x509_get_ext_key_usage( unsigned char **p, 572 const unsigned char *end, 573 mbedtls_x509_sequence *ext_key_usage) 574 { 575 int ret; 576 577 if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 ) 578 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 579 580 /* Sequence length must be >= 1 */ 581 if( ext_key_usage->buf.p == NULL ) 582 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 583 MBEDTLS_ERR_ASN1_INVALID_LENGTH ); 584 585 return( 0 ); 586 } 587 588 /* 589 * SubjectAltName ::= GeneralNames 590 * 591 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName 592 * 593 * GeneralName ::= CHOICE { 594 * otherName [0] OtherName, 595 * rfc822Name [1] IA5String, 596 * dNSName [2] IA5String, 597 * x400Address [3] ORAddress, 598 * directoryName [4] Name, 599 * ediPartyName [5] EDIPartyName, 600 * uniformResourceIdentifier [6] IA5String, 601 * iPAddress [7] OCTET STRING, 602 * registeredID [8] OBJECT IDENTIFIER } 603 * 604 * OtherName ::= SEQUENCE { 605 * type-id OBJECT IDENTIFIER, 606 * value [0] EXPLICIT ANY DEFINED BY type-id } 607 * 608 * EDIPartyName ::= SEQUENCE { 609 * nameAssigner [0] DirectoryString OPTIONAL, 610 * partyName [1] DirectoryString } 611 * 612 * NOTE: we only parse and use dNSName at this point. 613 */ 614 static int x509_get_subject_alt_name( unsigned char **p, 615 const unsigned char *end, 616 mbedtls_x509_sequence *subject_alt_name ) 617 { 618 int ret; 619 size_t len, tag_len; 620 mbedtls_asn1_buf *buf; 621 unsigned char tag; 622 mbedtls_asn1_sequence *cur = subject_alt_name; 623 624 /* Get main sequence tag */ 625 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 626 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 627 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 628 629 if( *p + len != end ) 630 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 631 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 632 633 while( *p < end ) 634 { 635 if( ( end - *p ) < 1 ) 636 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 637 MBEDTLS_ERR_ASN1_OUT_OF_DATA ); 638 639 tag = **p; 640 (*p)++; 641 if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 ) 642 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 643 644 if( ( tag & MBEDTLS_ASN1_TAG_CLASS_MASK ) != 645 MBEDTLS_ASN1_CONTEXT_SPECIFIC ) 646 { 647 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 648 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); 649 } 650 651 /* Skip everything but DNS name */ 652 if( tag != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2 ) ) 653 { 654 *p += tag_len; 655 continue; 656 } 657 658 /* Allocate and assign next pointer */ 659 if( cur->buf.p != NULL ) 660 { 661 if( cur->next != NULL ) 662 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); 663 664 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) ); 665 666 if( cur->next == NULL ) 667 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 668 MBEDTLS_ERR_ASN1_ALLOC_FAILED ); 669 670 cur = cur->next; 671 } 672 673 buf = &(cur->buf); 674 buf->tag = tag; 675 buf->p = *p; 676 buf->len = tag_len; 677 *p += buf->len; 678 } 679 680 /* Set final sequence entry's next pointer to NULL */ 681 cur->next = NULL; 682 683 if( *p != end ) 684 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 685 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 686 687 return( 0 ); 688 } 689 690 /* 691 * X.509 v3 extensions 692 * 693 */ 694 static int x509_get_crt_ext( unsigned char **p, 695 const unsigned char *end, 696 mbedtls_x509_crt *crt ) 697 { 698 int ret; 699 size_t len; 700 unsigned char *end_ext_data, *end_ext_octet; 701 702 if( *p == end ) 703 return( 0 ); 704 705 if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 ) 706 return( ret ); 707 708 end = crt->v3_ext.p + crt->v3_ext.len; 709 while( *p < end ) 710 { 711 /* 712 * Extension ::= SEQUENCE { 713 * extnID OBJECT IDENTIFIER, 714 * critical BOOLEAN DEFAULT FALSE, 715 * extnValue OCTET STRING } 716 */ 717 mbedtls_x509_buf extn_oid = {0, 0, NULL}; 718 int is_critical = 0; /* DEFAULT FALSE */ 719 int ext_type = 0; 720 721 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 722 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 723 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 724 725 end_ext_data = *p + len; 726 727 /* Get extension ID */ 728 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &extn_oid.len, 729 MBEDTLS_ASN1_OID ) ) != 0 ) 730 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 731 732 extn_oid.tag = MBEDTLS_ASN1_OID; 733 extn_oid.p = *p; 734 *p += extn_oid.len; 735 736 /* Get optional critical */ 737 if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 && 738 ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ) 739 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 740 741 /* Data should be octet string type */ 742 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len, 743 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) 744 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 745 746 end_ext_octet = *p + len; 747 748 if( end_ext_octet != end_ext_data ) 749 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 750 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 751 752 /* 753 * Detect supported extensions 754 */ 755 ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type ); 756 757 if( ret != 0 ) 758 { 759 /* No parser found, skip extension */ 760 *p = end_ext_octet; 761 762 #if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION) 763 if( is_critical ) 764 { 765 /* Data is marked as critical: fail */ 766 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 767 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); 768 } 769 #endif 770 continue; 771 } 772 773 /* Forbid repeated extensions */ 774 if( ( crt->ext_types & ext_type ) != 0 ) 775 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); 776 777 crt->ext_types |= ext_type; 778 779 switch( ext_type ) 780 { 781 case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS: 782 /* Parse basic constraints */ 783 if( ( ret = x509_get_basic_constraints( p, end_ext_octet, 784 &crt->ca_istrue, &crt->max_pathlen ) ) != 0 ) 785 return( ret ); 786 break; 787 788 case MBEDTLS_X509_EXT_KEY_USAGE: 789 /* Parse key usage */ 790 if( ( ret = x509_get_key_usage( p, end_ext_octet, 791 &crt->key_usage ) ) != 0 ) 792 return( ret ); 793 break; 794 795 case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE: 796 /* Parse extended key usage */ 797 if( ( ret = x509_get_ext_key_usage( p, end_ext_octet, 798 &crt->ext_key_usage ) ) != 0 ) 799 return( ret ); 800 break; 801 802 case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME: 803 /* Parse subject alt name */ 804 if( ( ret = x509_get_subject_alt_name( p, end_ext_octet, 805 &crt->subject_alt_names ) ) != 0 ) 806 return( ret ); 807 break; 808 809 case MBEDTLS_X509_EXT_NS_CERT_TYPE: 810 /* Parse netscape certificate type */ 811 if( ( ret = x509_get_ns_cert_type( p, end_ext_octet, 812 &crt->ns_cert_type ) ) != 0 ) 813 return( ret ); 814 break; 815 816 default: 817 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ); 818 } 819 } 820 821 if( *p != end ) 822 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 823 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 824 825 return( 0 ); 826 } 827 828 /* 829 * Parse and fill a single X.509 certificate in DER format 830 */ 831 static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *buf, 832 size_t buflen ) 833 { 834 int ret; 835 size_t len; 836 unsigned char *p, *end, *crt_end; 837 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2; 838 839 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) ); 840 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) ); 841 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) ); 842 843 /* 844 * Check for valid input 845 */ 846 if( crt == NULL || buf == NULL ) 847 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 848 849 // Use the original buffer until we figure out actual length 850 p = (unsigned char*) buf; 851 len = buflen; 852 end = p + len; 853 854 /* 855 * Certificate ::= SEQUENCE { 856 * tbsCertificate TBSCertificate, 857 * signatureAlgorithm AlgorithmIdentifier, 858 * signatureValue BIT STRING } 859 */ 860 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 861 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 862 { 863 mbedtls_x509_crt_free( crt ); 864 return( MBEDTLS_ERR_X509_INVALID_FORMAT ); 865 } 866 867 if( len > (size_t) ( end - p ) ) 868 { 869 mbedtls_x509_crt_free( crt ); 870 return( MBEDTLS_ERR_X509_INVALID_FORMAT + 871 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 872 } 873 crt_end = p + len; 874 875 // Create and populate a new buffer for the raw field 876 crt->raw.len = crt_end - buf; 877 crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len ); 878 if( p == NULL ) 879 return( MBEDTLS_ERR_X509_ALLOC_FAILED ); 880 881 memcpy( p, buf, crt->raw.len ); 882 883 // Direct pointers to the new buffer 884 p += crt->raw.len - len; 885 end = crt_end = p + len; 886 887 /* 888 * TBSCertificate ::= SEQUENCE { 889 */ 890 crt->tbs.p = p; 891 892 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 893 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 894 { 895 mbedtls_x509_crt_free( crt ); 896 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 897 } 898 899 end = p + len; 900 crt->tbs.len = end - crt->tbs.p; 901 902 /* 903 * Version ::= INTEGER { v1(0), v2(1), v3(2) } 904 * 905 * CertificateSerialNumber ::= INTEGER 906 * 907 * signature AlgorithmIdentifier 908 */ 909 if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 || 910 ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 || 911 ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid, 912 &sig_params1 ) ) != 0 ) 913 { 914 mbedtls_x509_crt_free( crt ); 915 return( ret ); 916 } 917 918 if( crt->version < 0 || crt->version > 2 ) 919 { 920 mbedtls_x509_crt_free( crt ); 921 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION ); 922 } 923 924 crt->version++; 925 926 if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1, 927 &crt->sig_md, &crt->sig_pk, 928 &crt->sig_opts ) ) != 0 ) 929 { 930 mbedtls_x509_crt_free( crt ); 931 return( ret ); 932 } 933 934 /* 935 * issuer Name 936 */ 937 crt->issuer_raw.p = p; 938 939 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 940 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 941 { 942 mbedtls_x509_crt_free( crt ); 943 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 944 } 945 946 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 ) 947 { 948 mbedtls_x509_crt_free( crt ); 949 return( ret ); 950 } 951 952 crt->issuer_raw.len = p - crt->issuer_raw.p; 953 954 /* 955 * Validity ::= SEQUENCE { 956 * notBefore Time, 957 * notAfter Time } 958 * 959 */ 960 if( ( ret = x509_get_dates( &p, end, &crt->valid_from, 961 &crt->valid_to ) ) != 0 ) 962 { 963 mbedtls_x509_crt_free( crt ); 964 return( ret ); 965 } 966 967 /* 968 * subject Name 969 */ 970 crt->subject_raw.p = p; 971 972 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 973 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 974 { 975 mbedtls_x509_crt_free( crt ); 976 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 977 } 978 979 if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 ) 980 { 981 mbedtls_x509_crt_free( crt ); 982 return( ret ); 983 } 984 985 crt->subject_raw.len = p - crt->subject_raw.p; 986 987 /* 988 * SubjectPublicKeyInfo 989 */ 990 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 ) 991 { 992 mbedtls_x509_crt_free( crt ); 993 return( ret ); 994 } 995 996 /* 997 * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL, 998 * -- If present, version shall be v2 or v3 999 * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL, 1000 * -- If present, version shall be v2 or v3 1001 * extensions [3] EXPLICIT Extensions OPTIONAL 1002 * -- If present, version shall be v3 1003 */ 1004 if( crt->version == 2 || crt->version == 3 ) 1005 { 1006 ret = x509_get_uid( &p, end, &crt->issuer_id, 1 ); 1007 if( ret != 0 ) 1008 { 1009 mbedtls_x509_crt_free( crt ); 1010 return( ret ); 1011 } 1012 } 1013 1014 if( crt->version == 2 || crt->version == 3 ) 1015 { 1016 ret = x509_get_uid( &p, end, &crt->subject_id, 2 ); 1017 if( ret != 0 ) 1018 { 1019 mbedtls_x509_crt_free( crt ); 1020 return( ret ); 1021 } 1022 } 1023 1024 #if !defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3) 1025 if( crt->version == 3 ) 1026 #endif 1027 { 1028 ret = x509_get_crt_ext( &p, end, crt ); 1029 if( ret != 0 ) 1030 { 1031 mbedtls_x509_crt_free( crt ); 1032 return( ret ); 1033 } 1034 } 1035 1036 if( p != end ) 1037 { 1038 mbedtls_x509_crt_free( crt ); 1039 return( MBEDTLS_ERR_X509_INVALID_FORMAT + 1040 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 1041 } 1042 1043 end = crt_end; 1044 1045 /* 1046 * } 1047 * -- end of TBSCertificate 1048 * 1049 * signatureAlgorithm AlgorithmIdentifier, 1050 * signatureValue BIT STRING 1051 */ 1052 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 ) 1053 { 1054 mbedtls_x509_crt_free( crt ); 1055 return( ret ); 1056 } 1057 1058 if( crt->sig_oid.len != sig_oid2.len || 1059 memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 || 1060 sig_params1.len != sig_params2.len || 1061 ( sig_params1.len != 0 && 1062 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) ) 1063 { 1064 mbedtls_x509_crt_free( crt ); 1065 return( MBEDTLS_ERR_X509_SIG_MISMATCH ); 1066 } 1067 1068 if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 ) 1069 { 1070 mbedtls_x509_crt_free( crt ); 1071 return( ret ); 1072 } 1073 1074 if( p != end ) 1075 { 1076 mbedtls_x509_crt_free( crt ); 1077 return( MBEDTLS_ERR_X509_INVALID_FORMAT + 1078 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 1079 } 1080 1081 return( 0 ); 1082 } 1083 1084 /* 1085 * Parse one X.509 certificate in DER format from a buffer and add them to a 1086 * chained list 1087 */ 1088 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf, 1089 size_t buflen ) 1090 { 1091 int ret; 1092 mbedtls_x509_crt *crt = chain, *prev = NULL; 1093 1094 /* 1095 * Check for valid input 1096 */ 1097 if( crt == NULL || buf == NULL ) 1098 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 1099 1100 while( crt->version != 0 && crt->next != NULL ) 1101 { 1102 prev = crt; 1103 crt = crt->next; 1104 } 1105 1106 /* 1107 * Add new certificate on the end of the chain if needed. 1108 */ 1109 if( crt->version != 0 && crt->next == NULL ) 1110 { 1111 crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); 1112 1113 if( crt->next == NULL ) 1114 return( MBEDTLS_ERR_X509_ALLOC_FAILED ); 1115 1116 prev = crt; 1117 mbedtls_x509_crt_init( crt->next ); 1118 crt = crt->next; 1119 } 1120 1121 if( ( ret = x509_crt_parse_der_core( crt, buf, buflen ) ) != 0 ) 1122 { 1123 if( prev ) 1124 prev->next = NULL; 1125 1126 if( crt != chain ) 1127 mbedtls_free( crt ); 1128 1129 return( ret ); 1130 } 1131 1132 return( 0 ); 1133 } 1134 1135 /* 1136 * Parse one or more PEM certificates from a buffer and add them to the chained 1137 * list 1138 */ 1139 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen ) 1140 { 1141 #if defined(MBEDTLS_PEM_PARSE_C) 1142 int success = 0, first_error = 0, total_failed = 0; 1143 int buf_format = MBEDTLS_X509_FORMAT_DER; 1144 #endif 1145 1146 /* 1147 * Check for valid input 1148 */ 1149 if( chain == NULL || buf == NULL ) 1150 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 1151 1152 /* 1153 * Determine buffer content. Buffer contains either one DER certificate or 1154 * one or more PEM certificates. 1155 */ 1156 #if defined(MBEDTLS_PEM_PARSE_C) 1157 if( buflen != 0 && buf[buflen - 1] == '\0' && 1158 strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL ) 1159 { 1160 buf_format = MBEDTLS_X509_FORMAT_PEM; 1161 } 1162 1163 if( buf_format == MBEDTLS_X509_FORMAT_DER ) 1164 return mbedtls_x509_crt_parse_der( chain, buf, buflen ); 1165 #else 1166 return mbedtls_x509_crt_parse_der( chain, buf, buflen ); 1167 #endif 1168 1169 #if defined(MBEDTLS_PEM_PARSE_C) 1170 if( buf_format == MBEDTLS_X509_FORMAT_PEM ) 1171 { 1172 int ret; 1173 mbedtls_pem_context pem; 1174 1175 /* 1 rather than 0 since the terminating NULL byte is counted in */ 1176 while( buflen > 1 ) 1177 { 1178 size_t use_len; 1179 mbedtls_pem_init( &pem ); 1180 1181 /* If we get there, we know the string is null-terminated */ 1182 ret = mbedtls_pem_read_buffer( &pem, 1183 "-----BEGIN CERTIFICATE-----", 1184 "-----END CERTIFICATE-----", 1185 buf, NULL, 0, &use_len ); 1186 1187 if( ret == 0 ) 1188 { 1189 /* 1190 * Was PEM encoded 1191 */ 1192 buflen -= use_len; 1193 buf += use_len; 1194 } 1195 else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA ) 1196 { 1197 return( ret ); 1198 } 1199 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT ) 1200 { 1201 mbedtls_pem_free( &pem ); 1202 1203 /* 1204 * PEM header and footer were found 1205 */ 1206 buflen -= use_len; 1207 buf += use_len; 1208 1209 if( first_error == 0 ) 1210 first_error = ret; 1211 1212 total_failed++; 1213 continue; 1214 } 1215 else 1216 break; 1217 1218 ret = mbedtls_x509_crt_parse_der( chain, pem.buf, pem.buflen ); 1219 1220 mbedtls_pem_free( &pem ); 1221 1222 if( ret != 0 ) 1223 { 1224 /* 1225 * Quit parsing on a memory error 1226 */ 1227 if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED ) 1228 return( ret ); 1229 1230 if( first_error == 0 ) 1231 first_error = ret; 1232 1233 total_failed++; 1234 continue; 1235 } 1236 1237 success = 1; 1238 } 1239 } 1240 1241 if( success ) 1242 return( total_failed ); 1243 else if( first_error ) 1244 return( first_error ); 1245 else 1246 return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT ); 1247 #endif /* MBEDTLS_PEM_PARSE_C */ 1248 } 1249 1250 #if defined(MBEDTLS_FS_IO) 1251 /* 1252 * Load one or more certificates and add them to the chained list 1253 */ 1254 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path ) 1255 { 1256 int ret; 1257 size_t n; 1258 unsigned char *buf; 1259 1260 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 ) 1261 return( ret ); 1262 1263 ret = mbedtls_x509_crt_parse( chain, buf, n ); 1264 1265 mbedtls_platform_zeroize( buf, n ); 1266 mbedtls_free( buf ); 1267 1268 return( ret ); 1269 } 1270 1271 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path ) 1272 { 1273 int ret = 0; 1274 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) 1275 int w_ret; 1276 WCHAR szDir[MAX_PATH]; 1277 char filename[MAX_PATH]; 1278 char *p; 1279 size_t len = strlen( path ); 1280 1281 WIN32_FIND_DATAW file_data; 1282 HANDLE hFind; 1283 1284 if( len > MAX_PATH - 3 ) 1285 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 1286 1287 memset( szDir, 0, sizeof(szDir) ); 1288 memset( filename, 0, MAX_PATH ); 1289 memcpy( filename, path, len ); 1290 filename[len++] = '\\'; 1291 p = filename + len; 1292 filename[len++] = '*'; 1293 1294 w_ret = MultiByteToWideChar( CP_ACP, 0, filename, (int)len, szDir, 1295 MAX_PATH - 3 ); 1296 if( w_ret == 0 ) 1297 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 1298 1299 hFind = FindFirstFileW( szDir, &file_data ); 1300 if( hFind == INVALID_HANDLE_VALUE ) 1301 return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); 1302 1303 len = MAX_PATH - len; 1304 do 1305 { 1306 memset( p, 0, len ); 1307 1308 if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) 1309 continue; 1310 1311 w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName, 1312 lstrlenW( file_data.cFileName ), 1313 p, (int) len - 1, 1314 NULL, NULL ); 1315 if( w_ret == 0 ) 1316 { 1317 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; 1318 goto cleanup; 1319 } 1320 1321 w_ret = mbedtls_x509_crt_parse_file( chain, filename ); 1322 if( w_ret < 0 ) 1323 ret++; 1324 else 1325 ret += w_ret; 1326 } 1327 while( FindNextFileW( hFind, &file_data ) != 0 ); 1328 1329 if( GetLastError() != ERROR_NO_MORE_FILES ) 1330 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; 1331 1332 cleanup: 1333 FindClose( hFind ); 1334 #else /* _WIN32 */ 1335 int t_ret; 1336 int snp_ret; 1337 struct stat sb; 1338 struct dirent *entry; 1339 char entry_name[MBEDTLS_X509_MAX_FILE_PATH_LEN]; 1340 DIR *dir = opendir( path ); 1341 1342 if( dir == NULL ) 1343 return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); 1344 1345 #if defined(MBEDTLS_THREADING_C) 1346 if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 ) 1347 { 1348 closedir( dir ); 1349 return( ret ); 1350 } 1351 #endif /* MBEDTLS_THREADING_C */ 1352 1353 while( ( entry = readdir( dir ) ) != NULL ) 1354 { 1355 snp_ret = mbedtls_snprintf( entry_name, sizeof entry_name, 1356 "%s/%s", path, entry->d_name ); 1357 1358 if( snp_ret < 0 || (size_t)snp_ret >= sizeof entry_name ) 1359 { 1360 ret = MBEDTLS_ERR_X509_BUFFER_TOO_SMALL; 1361 goto cleanup; 1362 } 1363 else if( stat( entry_name, &sb ) == -1 ) 1364 { 1365 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; 1366 goto cleanup; 1367 } 1368 1369 if( !S_ISREG( sb.st_mode ) ) 1370 continue; 1371 1372 // Ignore parse errors 1373 // 1374 t_ret = mbedtls_x509_crt_parse_file( chain, entry_name ); 1375 if( t_ret < 0 ) 1376 ret++; 1377 else 1378 ret += t_ret; 1379 } 1380 1381 cleanup: 1382 closedir( dir ); 1383 1384 #if defined(MBEDTLS_THREADING_C) 1385 if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 ) 1386 ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR; 1387 #endif /* MBEDTLS_THREADING_C */ 1388 1389 #endif /* _WIN32 */ 1390 1391 return( ret ); 1392 } 1393 #endif /* MBEDTLS_FS_IO */ 1394 1395 static int x509_info_subject_alt_name( char **buf, size_t *size, 1396 const mbedtls_x509_sequence *subject_alt_name ) 1397 { 1398 size_t i; 1399 size_t n = *size; 1400 char *p = *buf; 1401 const mbedtls_x509_sequence *cur = subject_alt_name; 1402 const char *sep = ""; 1403 size_t sep_len = 0; 1404 1405 while( cur != NULL ) 1406 { 1407 if( cur->buf.len + sep_len >= n ) 1408 { 1409 *p = '\0'; 1410 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); 1411 } 1412 1413 n -= cur->buf.len + sep_len; 1414 for( i = 0; i < sep_len; i++ ) 1415 *p++ = sep[i]; 1416 for( i = 0; i < cur->buf.len; i++ ) 1417 *p++ = cur->buf.p[i]; 1418 1419 sep = ", "; 1420 sep_len = 2; 1421 1422 cur = cur->next; 1423 } 1424 1425 *p = '\0'; 1426 1427 *size = n; 1428 *buf = p; 1429 1430 return( 0 ); 1431 } 1432 1433 #define PRINT_ITEM(i) \ 1434 { \ 1435 ret = mbedtls_snprintf( p, n, "%s" i, sep ); \ 1436 MBEDTLS_X509_SAFE_SNPRINTF; \ 1437 sep = ", "; \ 1438 } 1439 1440 #define CERT_TYPE(type,name) \ 1441 if( ns_cert_type & (type) ) \ 1442 PRINT_ITEM( name ); 1443 1444 static int x509_info_cert_type( char **buf, size_t *size, 1445 unsigned char ns_cert_type ) 1446 { 1447 int ret; 1448 size_t n = *size; 1449 char *p = *buf; 1450 const char *sep = ""; 1451 1452 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" ); 1453 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" ); 1454 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" ); 1455 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" ); 1456 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" ); 1457 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" ); 1458 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" ); 1459 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" ); 1460 1461 *size = n; 1462 *buf = p; 1463 1464 return( 0 ); 1465 } 1466 1467 #define KEY_USAGE(code,name) \ 1468 if( key_usage & (code) ) \ 1469 PRINT_ITEM( name ); 1470 1471 static int x509_info_key_usage( char **buf, size_t *size, 1472 unsigned int key_usage ) 1473 { 1474 int ret; 1475 size_t n = *size; 1476 char *p = *buf; 1477 const char *sep = ""; 1478 1479 KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" ); 1480 KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" ); 1481 KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" ); 1482 KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" ); 1483 KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" ); 1484 KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" ); 1485 KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" ); 1486 KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" ); 1487 KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" ); 1488 1489 *size = n; 1490 *buf = p; 1491 1492 return( 0 ); 1493 } 1494 1495 static int x509_info_ext_key_usage( char **buf, size_t *size, 1496 const mbedtls_x509_sequence *extended_key_usage ) 1497 { 1498 int ret; 1499 const char *desc; 1500 size_t n = *size; 1501 char *p = *buf; 1502 const mbedtls_x509_sequence *cur = extended_key_usage; 1503 const char *sep = ""; 1504 1505 while( cur != NULL ) 1506 { 1507 if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 ) 1508 desc = "???"; 1509 1510 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc ); 1511 MBEDTLS_X509_SAFE_SNPRINTF; 1512 1513 sep = ", "; 1514 1515 cur = cur->next; 1516 } 1517 1518 *size = n; 1519 *buf = p; 1520 1521 return( 0 ); 1522 } 1523 1524 /* 1525 * Return an informational string about the certificate. 1526 */ 1527 #define BEFORE_COLON 18 1528 #define BC "18" 1529 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix, 1530 const mbedtls_x509_crt *crt ) 1531 { 1532 int ret; 1533 size_t n; 1534 char *p; 1535 char key_size_str[BEFORE_COLON]; 1536 1537 p = buf; 1538 n = size; 1539 1540 if( NULL == crt ) 1541 { 1542 ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" ); 1543 MBEDTLS_X509_SAFE_SNPRINTF; 1544 1545 return( (int) ( size - n ) ); 1546 } 1547 1548 ret = mbedtls_snprintf( p, n, "%scert. version : %d\n", 1549 prefix, crt->version ); 1550 MBEDTLS_X509_SAFE_SNPRINTF; 1551 ret = mbedtls_snprintf( p, n, "%sserial number : ", 1552 prefix ); 1553 MBEDTLS_X509_SAFE_SNPRINTF; 1554 1555 ret = mbedtls_x509_serial_gets( p, n, &crt->serial ); 1556 MBEDTLS_X509_SAFE_SNPRINTF; 1557 1558 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix ); 1559 MBEDTLS_X509_SAFE_SNPRINTF; 1560 ret = mbedtls_x509_dn_gets( p, n, &crt->issuer ); 1561 MBEDTLS_X509_SAFE_SNPRINTF; 1562 1563 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix ); 1564 MBEDTLS_X509_SAFE_SNPRINTF; 1565 ret = mbedtls_x509_dn_gets( p, n, &crt->subject ); 1566 MBEDTLS_X509_SAFE_SNPRINTF; 1567 1568 ret = mbedtls_snprintf( p, n, "\n%sissued on : " \ 1569 "%04d-%02d-%02d %02d:%02d:%02d", prefix, 1570 crt->valid_from.year, crt->valid_from.mon, 1571 crt->valid_from.day, crt->valid_from.hour, 1572 crt->valid_from.min, crt->valid_from.sec ); 1573 MBEDTLS_X509_SAFE_SNPRINTF; 1574 1575 ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \ 1576 "%04d-%02d-%02d %02d:%02d:%02d", prefix, 1577 crt->valid_to.year, crt->valid_to.mon, 1578 crt->valid_to.day, crt->valid_to.hour, 1579 crt->valid_to.min, crt->valid_to.sec ); 1580 MBEDTLS_X509_SAFE_SNPRINTF; 1581 1582 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix ); 1583 MBEDTLS_X509_SAFE_SNPRINTF; 1584 1585 ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk, 1586 crt->sig_md, crt->sig_opts ); 1587 MBEDTLS_X509_SAFE_SNPRINTF; 1588 1589 /* Key size */ 1590 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON, 1591 mbedtls_pk_get_name( &crt->pk ) ) ) != 0 ) 1592 { 1593 return( ret ); 1594 } 1595 1596 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str, 1597 (int) mbedtls_pk_get_bitlen( &crt->pk ) ); 1598 MBEDTLS_X509_SAFE_SNPRINTF; 1599 1600 /* 1601 * Optional extensions 1602 */ 1603 1604 if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS ) 1605 { 1606 ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix, 1607 crt->ca_istrue ? "true" : "false" ); 1608 MBEDTLS_X509_SAFE_SNPRINTF; 1609 1610 if( crt->max_pathlen > 0 ) 1611 { 1612 ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 ); 1613 MBEDTLS_X509_SAFE_SNPRINTF; 1614 } 1615 } 1616 1617 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) 1618 { 1619 ret = mbedtls_snprintf( p, n, "\n%ssubject alt name : ", prefix ); 1620 MBEDTLS_X509_SAFE_SNPRINTF; 1621 1622 if( ( ret = x509_info_subject_alt_name( &p, &n, 1623 &crt->subject_alt_names ) ) != 0 ) 1624 return( ret ); 1625 } 1626 1627 if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE ) 1628 { 1629 ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix ); 1630 MBEDTLS_X509_SAFE_SNPRINTF; 1631 1632 if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 ) 1633 return( ret ); 1634 } 1635 1636 if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) 1637 { 1638 ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix ); 1639 MBEDTLS_X509_SAFE_SNPRINTF; 1640 1641 if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 ) 1642 return( ret ); 1643 } 1644 1645 if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) 1646 { 1647 ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix ); 1648 MBEDTLS_X509_SAFE_SNPRINTF; 1649 1650 if( ( ret = x509_info_ext_key_usage( &p, &n, 1651 &crt->ext_key_usage ) ) != 0 ) 1652 return( ret ); 1653 } 1654 1655 ret = mbedtls_snprintf( p, n, "\n" ); 1656 MBEDTLS_X509_SAFE_SNPRINTF; 1657 1658 return( (int) ( size - n ) ); 1659 } 1660 1661 struct x509_crt_verify_string { 1662 int code; 1663 const char *string; 1664 }; 1665 1666 static const struct x509_crt_verify_string x509_crt_verify_strings[] = { 1667 { MBEDTLS_X509_BADCERT_EXPIRED, "The certificate validity has expired" }, 1668 { MBEDTLS_X509_BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" }, 1669 { MBEDTLS_X509_BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" }, 1670 { MBEDTLS_X509_BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" }, 1671 { MBEDTLS_X509_BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" }, 1672 { MBEDTLS_X509_BADCRL_EXPIRED, "The CRL is expired" }, 1673 { MBEDTLS_X509_BADCERT_MISSING, "Certificate was missing" }, 1674 { MBEDTLS_X509_BADCERT_SKIP_VERIFY, "Certificate verification was skipped" }, 1675 { MBEDTLS_X509_BADCERT_OTHER, "Other reason (can be used by verify callback)" }, 1676 { MBEDTLS_X509_BADCERT_FUTURE, "The certificate validity starts in the future" }, 1677 { MBEDTLS_X509_BADCRL_FUTURE, "The CRL is from the future" }, 1678 { MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" }, 1679 { MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" }, 1680 { MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" }, 1681 { MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." }, 1682 { MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, 1683 { MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." }, 1684 { MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." }, 1685 { MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, 1686 { MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." }, 1687 { 0, NULL } 1688 }; 1689 1690 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix, 1691 uint32_t flags ) 1692 { 1693 int ret; 1694 const struct x509_crt_verify_string *cur; 1695 char *p = buf; 1696 size_t n = size; 1697 1698 for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ ) 1699 { 1700 if( ( flags & cur->code ) == 0 ) 1701 continue; 1702 1703 ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string ); 1704 MBEDTLS_X509_SAFE_SNPRINTF; 1705 flags ^= cur->code; 1706 } 1707 1708 if( flags != 0 ) 1709 { 1710 ret = mbedtls_snprintf( p, n, "%sUnknown reason " 1711 "(this should not happen)\n", prefix ); 1712 MBEDTLS_X509_SAFE_SNPRINTF; 1713 } 1714 1715 return( (int) ( size - n ) ); 1716 } 1717 1718 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) 1719 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt, 1720 unsigned int usage ) 1721 { 1722 unsigned int usage_must, usage_may; 1723 unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY 1724 | MBEDTLS_X509_KU_DECIPHER_ONLY; 1725 1726 if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 ) 1727 return( 0 ); 1728 1729 usage_must = usage & ~may_mask; 1730 1731 if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must ) 1732 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 1733 1734 usage_may = usage & may_mask; 1735 1736 if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may ) 1737 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 1738 1739 return( 0 ); 1740 } 1741 #endif 1742 1743 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) 1744 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt, 1745 const char *usage_oid, 1746 size_t usage_len ) 1747 { 1748 const mbedtls_x509_sequence *cur; 1749 1750 /* Extension is not mandatory, absent means no restriction */ 1751 if( ( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 ) 1752 return( 0 ); 1753 1754 /* 1755 * Look for the requested usage (or wildcard ANY) in our list 1756 */ 1757 for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next ) 1758 { 1759 const mbedtls_x509_buf *cur_oid = &cur->buf; 1760 1761 if( cur_oid->len == usage_len && 1762 memcmp( cur_oid->p, usage_oid, usage_len ) == 0 ) 1763 { 1764 return( 0 ); 1765 } 1766 1767 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 ) 1768 return( 0 ); 1769 } 1770 1771 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 1772 } 1773 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ 1774 1775 #if defined(MBEDTLS_X509_CRL_PARSE_C) 1776 /* 1777 * Return 1 if the certificate is revoked, or 0 otherwise. 1778 */ 1779 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl ) 1780 { 1781 const mbedtls_x509_crl_entry *cur = &crl->entry; 1782 1783 while( cur != NULL && cur->serial.len != 0 ) 1784 { 1785 if( crt->serial.len == cur->serial.len && 1786 memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 ) 1787 { 1788 if( mbedtls_x509_time_is_past( &cur->revocation_date ) ) 1789 return( 1 ); 1790 } 1791 1792 cur = cur->next; 1793 } 1794 1795 return( 0 ); 1796 } 1797 1798 /* 1799 * Check that the given certificate is not revoked according to the CRL. 1800 * Skip validation if no CRL for the given CA is present. 1801 */ 1802 static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca, 1803 mbedtls_x509_crl *crl_list, 1804 const mbedtls_x509_crt_profile *profile ) 1805 { 1806 int flags = 0; 1807 unsigned char hash[MBEDTLS_MD_MAX_SIZE]; 1808 const mbedtls_md_info_t *md_info; 1809 1810 if( ca == NULL ) 1811 return( flags ); 1812 1813 while( crl_list != NULL ) 1814 { 1815 if( crl_list->version == 0 || 1816 x509_name_cmp( &crl_list->issuer, &ca->subject ) != 0 ) 1817 { 1818 crl_list = crl_list->next; 1819 continue; 1820 } 1821 1822 /* 1823 * Check if the CA is configured to sign CRLs 1824 */ 1825 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) 1826 if( mbedtls_x509_crt_check_key_usage( ca, 1827 MBEDTLS_X509_KU_CRL_SIGN ) != 0 ) 1828 { 1829 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; 1830 break; 1831 } 1832 #endif 1833 1834 /* 1835 * Check if CRL is correctly signed by the trusted CA 1836 */ 1837 if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 ) 1838 flags |= MBEDTLS_X509_BADCRL_BAD_MD; 1839 1840 if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 ) 1841 flags |= MBEDTLS_X509_BADCRL_BAD_PK; 1842 1843 md_info = mbedtls_md_info_from_type( crl_list->sig_md ); 1844 if( mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ) != 0 ) 1845 { 1846 /* Note: this can't happen except after an internal error */ 1847 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; 1848 break; 1849 } 1850 1851 if( x509_profile_check_key( profile, &ca->pk ) != 0 ) 1852 flags |= MBEDTLS_X509_BADCERT_BAD_KEY; 1853 1854 if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk, 1855 crl_list->sig_md, hash, mbedtls_md_get_size( md_info ), 1856 crl_list->sig.p, crl_list->sig.len ) != 0 ) 1857 { 1858 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; 1859 break; 1860 } 1861 1862 /* 1863 * Check for validity of CRL (Do not drop out) 1864 */ 1865 if( mbedtls_x509_time_is_past( &crl_list->next_update ) ) 1866 flags |= MBEDTLS_X509_BADCRL_EXPIRED; 1867 1868 if( mbedtls_x509_time_is_future( &crl_list->this_update ) ) 1869 flags |= MBEDTLS_X509_BADCRL_FUTURE; 1870 1871 /* 1872 * Check if certificate is revoked 1873 */ 1874 if( mbedtls_x509_crt_is_revoked( crt, crl_list ) ) 1875 { 1876 flags |= MBEDTLS_X509_BADCERT_REVOKED; 1877 break; 1878 } 1879 1880 crl_list = crl_list->next; 1881 } 1882 1883 return( flags ); 1884 } 1885 #endif /* MBEDTLS_X509_CRL_PARSE_C */ 1886 1887 /* 1888 * Check the signature of a certificate by its parent 1889 */ 1890 static int x509_crt_check_signature( const mbedtls_x509_crt *child, 1891 mbedtls_x509_crt *parent, 1892 mbedtls_x509_crt_restart_ctx *rs_ctx ) 1893 { 1894 const mbedtls_md_info_t *md_info; 1895 unsigned char hash[MBEDTLS_MD_MAX_SIZE]; 1896 1897 md_info = mbedtls_md_info_from_type( child->sig_md ); 1898 if( mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ) != 0 ) 1899 { 1900 /* Note: this can't happen except after an internal error */ 1901 return( -1 ); 1902 } 1903 1904 /* Skip expensive computation on obvious mismatch */ 1905 if( ! mbedtls_pk_can_do( &parent->pk, child->sig_pk ) ) 1906 return( -1 ); 1907 1908 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 1909 if( rs_ctx != NULL && child->sig_pk == MBEDTLS_PK_ECDSA ) 1910 { 1911 return( mbedtls_pk_verify_restartable( &parent->pk, 1912 child->sig_md, hash, mbedtls_md_get_size( md_info ), 1913 child->sig.p, child->sig.len, &rs_ctx->pk ) ); 1914 } 1915 #else 1916 (void) rs_ctx; 1917 #endif 1918 1919 return( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk, 1920 child->sig_md, hash, mbedtls_md_get_size( md_info ), 1921 child->sig.p, child->sig.len ) ); 1922 } 1923 1924 /* 1925 * Check if 'parent' is a suitable parent (signing CA) for 'child'. 1926 * Return 0 if yes, -1 if not. 1927 * 1928 * top means parent is a locally-trusted certificate 1929 */ 1930 static int x509_crt_check_parent( const mbedtls_x509_crt *child, 1931 const mbedtls_x509_crt *parent, 1932 int top ) 1933 { 1934 int need_ca_bit; 1935 1936 /* Parent must be the issuer */ 1937 if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 ) 1938 return( -1 ); 1939 1940 /* Parent must have the basicConstraints CA bit set as a general rule */ 1941 need_ca_bit = 1; 1942 1943 /* Exception: v1/v2 certificates that are locally trusted. */ 1944 if( top && parent->version < 3 ) 1945 need_ca_bit = 0; 1946 1947 if( need_ca_bit && ! parent->ca_istrue ) 1948 return( -1 ); 1949 1950 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) 1951 if( need_ca_bit && 1952 mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 ) 1953 { 1954 return( -1 ); 1955 } 1956 #endif 1957 1958 return( 0 ); 1959 } 1960 1961 /* 1962 * Find a suitable parent for child in candidates, or return NULL. 1963 * 1964 * Here suitable is defined as: 1965 * 1. subject name matches child's issuer 1966 * 2. if necessary, the CA bit is set and key usage allows signing certs 1967 * 3. for trusted roots, the signature is correct 1968 * (for intermediates, the signature is checked and the result reported) 1969 * 4. pathlen constraints are satisfied 1970 * 1971 * If there's a suitable candidate which is also time-valid, return the first 1972 * such. Otherwise, return the first suitable candidate (or NULL if there is 1973 * none). 1974 * 1975 * The rationale for this rule is that someone could have a list of trusted 1976 * roots with two versions on the same root with different validity periods. 1977 * (At least one user reported having such a list and wanted it to just work.) 1978 * The reason we don't just require time-validity is that generally there is 1979 * only one version, and if it's expired we want the flags to state that 1980 * rather than NOT_TRUSTED, as would be the case if we required it here. 1981 * 1982 * The rationale for rule 3 (signature for trusted roots) is that users might 1983 * have two versions of the same CA with different keys in their list, and the 1984 * way we select the correct one is by checking the signature (as we don't 1985 * rely on key identifier extensions). (This is one way users might choose to 1986 * handle key rollover, another relies on self-issued certs, see [SIRO].) 1987 * 1988 * Arguments: 1989 * - [in] child: certificate for which we're looking for a parent 1990 * - [in] candidates: chained list of potential parents 1991 * - [out] r_parent: parent found (or NULL) 1992 * - [out] r_signature_is_good: 1 if child signature by parent is valid, or 0 1993 * - [in] top: 1 if candidates consists of trusted roots, ie we're at the top 1994 * of the chain, 0 otherwise 1995 * - [in] path_cnt: number of intermediates seen so far 1996 * - [in] self_cnt: number of self-signed intermediates seen so far 1997 * (will never be greater than path_cnt) 1998 * - [in-out] rs_ctx: context for restarting operations 1999 * 2000 * Return value: 2001 * - 0 on success 2002 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise 2003 */ 2004 static int x509_crt_find_parent_in( 2005 mbedtls_x509_crt *child, 2006 mbedtls_x509_crt *candidates, 2007 mbedtls_x509_crt **r_parent, 2008 int *r_signature_is_good, 2009 int top, 2010 unsigned path_cnt, 2011 unsigned self_cnt, 2012 mbedtls_x509_crt_restart_ctx *rs_ctx ) 2013 { 2014 int ret; 2015 mbedtls_x509_crt *parent, *fallback_parent; 2016 int signature_is_good, fallback_signature_is_good; 2017 2018 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2019 /* did we have something in progress? */ 2020 if( rs_ctx != NULL && rs_ctx->parent != NULL ) 2021 { 2022 /* restore saved state */ 2023 parent = rs_ctx->parent; 2024 fallback_parent = rs_ctx->fallback_parent; 2025 fallback_signature_is_good = rs_ctx->fallback_signature_is_good; 2026 2027 /* clear saved state */ 2028 rs_ctx->parent = NULL; 2029 rs_ctx->fallback_parent = NULL; 2030 rs_ctx->fallback_signature_is_good = 0; 2031 2032 /* resume where we left */ 2033 goto check_signature; 2034 } 2035 #endif 2036 2037 fallback_parent = NULL; 2038 fallback_signature_is_good = 0; 2039 2040 for( parent = candidates; parent != NULL; parent = parent->next ) 2041 { 2042 /* basic parenting skills (name, CA bit, key usage) */ 2043 if( x509_crt_check_parent( child, parent, top ) != 0 ) 2044 continue; 2045 2046 /* +1 because stored max_pathlen is 1 higher that the actual value */ 2047 if( parent->max_pathlen > 0 && 2048 (size_t) parent->max_pathlen < 1 + path_cnt - self_cnt ) 2049 { 2050 continue; 2051 } 2052 2053 /* Signature */ 2054 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2055 check_signature: 2056 #endif 2057 ret = x509_crt_check_signature( child, parent, rs_ctx ); 2058 2059 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2060 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) 2061 { 2062 /* save state */ 2063 rs_ctx->parent = parent; 2064 rs_ctx->fallback_parent = fallback_parent; 2065 rs_ctx->fallback_signature_is_good = fallback_signature_is_good; 2066 2067 return( ret ); 2068 } 2069 #else 2070 (void) ret; 2071 #endif 2072 2073 signature_is_good = ret == 0; 2074 if( top && ! signature_is_good ) 2075 continue; 2076 2077 /* optional time check */ 2078 if( mbedtls_x509_time_is_past( &parent->valid_to ) || 2079 mbedtls_x509_time_is_future( &parent->valid_from ) ) 2080 { 2081 if( fallback_parent == NULL ) 2082 { 2083 fallback_parent = parent; 2084 fallback_signature_is_good = signature_is_good; 2085 } 2086 2087 continue; 2088 } 2089 2090 *r_parent = parent; 2091 *r_signature_is_good = signature_is_good; 2092 2093 break; 2094 } 2095 2096 if( parent == NULL ) 2097 { 2098 *r_parent = fallback_parent; 2099 *r_signature_is_good = fallback_signature_is_good; 2100 } 2101 2102 return( 0 ); 2103 } 2104 2105 /* 2106 * Find a parent in trusted CAs or the provided chain, or return NULL. 2107 * 2108 * Searches in trusted CAs first, and return the first suitable parent found 2109 * (see find_parent_in() for definition of suitable). 2110 * 2111 * Arguments: 2112 * - [in] child: certificate for which we're looking for a parent, followed 2113 * by a chain of possible intermediates 2114 * - [in] trust_ca: list of locally trusted certificates 2115 * - [out] parent: parent found (or NULL) 2116 * - [out] parent_is_trusted: 1 if returned `parent` is trusted, or 0 2117 * - [out] signature_is_good: 1 if child signature by parent is valid, or 0 2118 * - [in] path_cnt: number of links in the chain so far (EE -> ... -> child) 2119 * - [in] self_cnt: number of self-signed certs in the chain so far 2120 * (will always be no greater than path_cnt) 2121 * - [in-out] rs_ctx: context for restarting operations 2122 * 2123 * Return value: 2124 * - 0 on success 2125 * - MBEDTLS_ERR_ECP_IN_PROGRESS otherwise 2126 */ 2127 static int x509_crt_find_parent( 2128 mbedtls_x509_crt *child, 2129 mbedtls_x509_crt *trust_ca, 2130 mbedtls_x509_crt **parent, 2131 int *parent_is_trusted, 2132 int *signature_is_good, 2133 unsigned path_cnt, 2134 unsigned self_cnt, 2135 mbedtls_x509_crt_restart_ctx *rs_ctx ) 2136 { 2137 int ret; 2138 mbedtls_x509_crt *search_list; 2139 2140 *parent_is_trusted = 1; 2141 2142 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2143 /* restore then clear saved state if we have some stored */ 2144 if( rs_ctx != NULL && rs_ctx->parent_is_trusted != -1 ) 2145 { 2146 *parent_is_trusted = rs_ctx->parent_is_trusted; 2147 rs_ctx->parent_is_trusted = -1; 2148 } 2149 #endif 2150 2151 while( 1 ) { 2152 search_list = *parent_is_trusted ? trust_ca : child->next; 2153 2154 ret = x509_crt_find_parent_in( child, search_list, 2155 parent, signature_is_good, 2156 *parent_is_trusted, 2157 path_cnt, self_cnt, rs_ctx ); 2158 2159 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2160 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) 2161 { 2162 /* save state */ 2163 rs_ctx->parent_is_trusted = *parent_is_trusted; 2164 return( ret ); 2165 } 2166 #else 2167 (void) ret; 2168 #endif 2169 2170 /* stop here if found or already in second iteration */ 2171 if( *parent != NULL || *parent_is_trusted == 0 ) 2172 break; 2173 2174 /* prepare second iteration */ 2175 *parent_is_trusted = 0; 2176 } 2177 2178 /* extra precaution against mistakes in the caller */ 2179 if( *parent == NULL ) 2180 { 2181 *parent_is_trusted = 0; 2182 *signature_is_good = 0; 2183 } 2184 2185 return( 0 ); 2186 } 2187 2188 /* 2189 * Check if an end-entity certificate is locally trusted 2190 * 2191 * Currently we require such certificates to be self-signed (actually only 2192 * check for self-issued as self-signatures are not checked) 2193 */ 2194 static int x509_crt_check_ee_locally_trusted( 2195 mbedtls_x509_crt *crt, 2196 mbedtls_x509_crt *trust_ca ) 2197 { 2198 mbedtls_x509_crt *cur; 2199 2200 /* must be self-issued */ 2201 if( x509_name_cmp( &crt->issuer, &crt->subject ) != 0 ) 2202 return( -1 ); 2203 2204 /* look for an exact match with trusted cert */ 2205 for( cur = trust_ca; cur != NULL; cur = cur->next ) 2206 { 2207 if( crt->raw.len == cur->raw.len && 2208 memcmp( crt->raw.p, cur->raw.p, crt->raw.len ) == 0 ) 2209 { 2210 return( 0 ); 2211 } 2212 } 2213 2214 /* too bad */ 2215 return( -1 ); 2216 } 2217 2218 /* 2219 * Build and verify a certificate chain 2220 * 2221 * Given a peer-provided list of certificates EE, C1, ..., Cn and 2222 * a list of trusted certs R1, ... Rp, try to build and verify a chain 2223 * EE, Ci1, ... Ciq [, Rj] 2224 * such that every cert in the chain is a child of the next one, 2225 * jumping to a trusted root as early as possible. 2226 * 2227 * Verify that chain and return it with flags for all issues found. 2228 * 2229 * Special cases: 2230 * - EE == Rj -> return a one-element list containing it 2231 * - EE, Ci1, ..., Ciq cannot be continued with a trusted root 2232 * -> return that chain with NOT_TRUSTED set on Ciq 2233 * 2234 * Tests for (aspects of) this function should include at least: 2235 * - trusted EE 2236 * - EE -> trusted root 2237 * - EE -> intermediate CA -> trusted root 2238 * - if relevant: EE untrusted 2239 * - if relevant: EE -> intermediate, untrusted 2240 * with the aspect under test checked at each relevant level (EE, int, root). 2241 * For some aspects longer chains are required, but usually length 2 is 2242 * enough (but length 1 is not in general). 2243 * 2244 * Arguments: 2245 * - [in] crt: the cert list EE, C1, ..., Cn 2246 * - [in] trust_ca: the trusted list R1, ..., Rp 2247 * - [in] ca_crl, profile: as in verify_with_profile() 2248 * - [out] ver_chain: the built and verified chain 2249 * Only valid when return value is 0, may contain garbage otherwise! 2250 * Restart note: need not be the same when calling again to resume. 2251 * - [in-out] rs_ctx: context for restarting operations 2252 * 2253 * Return value: 2254 * - non-zero if the chain could not be fully built and examined 2255 * - 0 is the chain was successfully built and examined, 2256 * even if it was found to be invalid 2257 */ 2258 static int x509_crt_verify_chain( 2259 mbedtls_x509_crt *crt, 2260 mbedtls_x509_crt *trust_ca, 2261 mbedtls_x509_crl *ca_crl, 2262 const mbedtls_x509_crt_profile *profile, 2263 mbedtls_x509_crt_verify_chain *ver_chain, 2264 mbedtls_x509_crt_restart_ctx *rs_ctx ) 2265 { 2266 /* Don't initialize any of those variables here, so that the compiler can 2267 * catch potential issues with jumping ahead when restarting */ 2268 int ret; 2269 uint32_t *flags; 2270 mbedtls_x509_crt_verify_chain_item *cur; 2271 mbedtls_x509_crt *child; 2272 mbedtls_x509_crt *parent; 2273 int parent_is_trusted; 2274 int child_is_trusted; 2275 int signature_is_good; 2276 unsigned self_cnt; 2277 2278 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2279 /* resume if we had an operation in progress */ 2280 if( rs_ctx != NULL && rs_ctx->in_progress == x509_crt_rs_find_parent ) 2281 { 2282 /* restore saved state */ 2283 *ver_chain = rs_ctx->ver_chain; /* struct copy */ 2284 self_cnt = rs_ctx->self_cnt; 2285 2286 /* restore derived state */ 2287 cur = &ver_chain->items[ver_chain->len - 1]; 2288 child = cur->crt; 2289 flags = &cur->flags; 2290 2291 goto find_parent; 2292 } 2293 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ 2294 2295 child = crt; 2296 self_cnt = 0; 2297 parent_is_trusted = 0; 2298 child_is_trusted = 0; 2299 2300 while( 1 ) { 2301 /* Add certificate to the verification chain */ 2302 cur = &ver_chain->items[ver_chain->len]; 2303 cur->crt = child; 2304 cur->flags = 0; 2305 ver_chain->len++; 2306 flags = &cur->flags; 2307 2308 /* Check time-validity (all certificates) */ 2309 if( mbedtls_x509_time_is_past( &child->valid_to ) ) 2310 *flags |= MBEDTLS_X509_BADCERT_EXPIRED; 2311 2312 if( mbedtls_x509_time_is_future( &child->valid_from ) ) 2313 *flags |= MBEDTLS_X509_BADCERT_FUTURE; 2314 2315 /* Stop here for trusted roots (but not for trusted EE certs) */ 2316 if( child_is_trusted ) 2317 return( 0 ); 2318 2319 /* Check signature algorithm: MD & PK algs */ 2320 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 ) 2321 *flags |= MBEDTLS_X509_BADCERT_BAD_MD; 2322 2323 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 ) 2324 *flags |= MBEDTLS_X509_BADCERT_BAD_PK; 2325 2326 /* Special case: EE certs that are locally trusted */ 2327 if( ver_chain->len == 1 && 2328 x509_crt_check_ee_locally_trusted( child, trust_ca ) == 0 ) 2329 { 2330 return( 0 ); 2331 } 2332 2333 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2334 find_parent: 2335 #endif 2336 /* Look for a parent in trusted CAs or up the chain */ 2337 ret = x509_crt_find_parent( child, trust_ca, &parent, 2338 &parent_is_trusted, &signature_is_good, 2339 ver_chain->len - 1, self_cnt, rs_ctx ); 2340 2341 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2342 if( rs_ctx != NULL && ret == MBEDTLS_ERR_ECP_IN_PROGRESS ) 2343 { 2344 /* save state */ 2345 rs_ctx->in_progress = x509_crt_rs_find_parent; 2346 rs_ctx->self_cnt = self_cnt; 2347 rs_ctx->ver_chain = *ver_chain; /* struct copy */ 2348 2349 return( ret ); 2350 } 2351 #else 2352 (void) ret; 2353 #endif 2354 2355 /* No parent? We're done here */ 2356 if( parent == NULL ) 2357 { 2358 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; 2359 return( 0 ); 2360 } 2361 2362 /* Count intermediate self-issued (not necessarily self-signed) certs. 2363 * These can occur with some strategies for key rollover, see [SIRO], 2364 * and should be excluded from max_pathlen checks. */ 2365 if( ver_chain->len != 1 && 2366 x509_name_cmp( &child->issuer, &child->subject ) == 0 ) 2367 { 2368 self_cnt++; 2369 } 2370 2371 /* path_cnt is 0 for the first intermediate CA, 2372 * and if parent is trusted it's not an intermediate CA */ 2373 if( ! parent_is_trusted && 2374 ver_chain->len > MBEDTLS_X509_MAX_INTERMEDIATE_CA ) 2375 { 2376 /* return immediately to avoid overflow the chain array */ 2377 return( MBEDTLS_ERR_X509_FATAL_ERROR ); 2378 } 2379 2380 /* signature was checked while searching parent */ 2381 if( ! signature_is_good ) 2382 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; 2383 2384 /* check size of signing key */ 2385 if( x509_profile_check_key( profile, &parent->pk ) != 0 ) 2386 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; 2387 2388 #if defined(MBEDTLS_X509_CRL_PARSE_C) 2389 /* Check trusted CA's CRL for the given crt */ 2390 *flags |= x509_crt_verifycrl( child, parent, ca_crl, profile ); 2391 #else 2392 (void) ca_crl; 2393 #endif 2394 2395 /* prepare for next iteration */ 2396 child = parent; 2397 parent = NULL; 2398 child_is_trusted = parent_is_trusted; 2399 signature_is_good = 0; 2400 } 2401 } 2402 2403 /* 2404 * Check for CN match 2405 */ 2406 static int x509_crt_check_cn( const mbedtls_x509_buf *name, 2407 const char *cn, size_t cn_len ) 2408 { 2409 /* try exact match */ 2410 if( name->len == cn_len && 2411 x509_memcasecmp( cn, name->p, cn_len ) == 0 ) 2412 { 2413 return( 0 ); 2414 } 2415 2416 /* try wildcard match */ 2417 if( x509_check_wildcard( cn, name ) == 0 ) 2418 { 2419 return( 0 ); 2420 } 2421 2422 return( -1 ); 2423 } 2424 2425 /* 2426 * Verify the requested CN - only call this if cn is not NULL! 2427 */ 2428 static void x509_crt_verify_name( const mbedtls_x509_crt *crt, 2429 const char *cn, 2430 uint32_t *flags ) 2431 { 2432 const mbedtls_x509_name *name; 2433 const mbedtls_x509_sequence *cur; 2434 size_t cn_len = strlen( cn ); 2435 2436 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) 2437 { 2438 for( cur = &crt->subject_alt_names; cur != NULL; cur = cur->next ) 2439 { 2440 if( x509_crt_check_cn( &cur->buf, cn, cn_len ) == 0 ) 2441 break; 2442 } 2443 2444 if( cur == NULL ) 2445 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; 2446 } 2447 else 2448 { 2449 for( name = &crt->subject; name != NULL; name = name->next ) 2450 { 2451 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 && 2452 x509_crt_check_cn( &name->val, cn, cn_len ) == 0 ) 2453 { 2454 break; 2455 } 2456 } 2457 2458 if( name == NULL ) 2459 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; 2460 } 2461 } 2462 2463 /* 2464 * Merge the flags for all certs in the chain, after calling callback 2465 */ 2466 static int x509_crt_merge_flags_with_cb( 2467 uint32_t *flags, 2468 const mbedtls_x509_crt_verify_chain *ver_chain, 2469 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 2470 void *p_vrfy ) 2471 { 2472 int ret; 2473 unsigned i; 2474 uint32_t cur_flags; 2475 const mbedtls_x509_crt_verify_chain_item *cur; 2476 2477 for( i = ver_chain->len; i != 0; --i ) 2478 { 2479 cur = &ver_chain->items[i-1]; 2480 cur_flags = cur->flags; 2481 2482 if( NULL != f_vrfy ) 2483 if( ( ret = f_vrfy( p_vrfy, cur->crt, (int) i-1, &cur_flags ) ) != 0 ) 2484 return( ret ); 2485 2486 *flags |= cur_flags; 2487 } 2488 2489 return( 0 ); 2490 } 2491 2492 /* 2493 * Verify the certificate validity (default profile, not restartable) 2494 */ 2495 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt, 2496 mbedtls_x509_crt *trust_ca, 2497 mbedtls_x509_crl *ca_crl, 2498 const char *cn, uint32_t *flags, 2499 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 2500 void *p_vrfy ) 2501 { 2502 return( mbedtls_x509_crt_verify_restartable( crt, trust_ca, ca_crl, 2503 &mbedtls_x509_crt_profile_default, cn, flags, 2504 f_vrfy, p_vrfy, NULL ) ); 2505 } 2506 2507 /* 2508 * Verify the certificate validity (user-chosen profile, not restartable) 2509 */ 2510 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt, 2511 mbedtls_x509_crt *trust_ca, 2512 mbedtls_x509_crl *ca_crl, 2513 const mbedtls_x509_crt_profile *profile, 2514 const char *cn, uint32_t *flags, 2515 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 2516 void *p_vrfy ) 2517 { 2518 return( mbedtls_x509_crt_verify_restartable( crt, trust_ca, ca_crl, 2519 profile, cn, flags, f_vrfy, p_vrfy, NULL ) ); 2520 } 2521 2522 /* 2523 * Verify the certificate validity, with profile, restartable version 2524 * 2525 * This function: 2526 * - checks the requested CN (if any) 2527 * - checks the type and size of the EE cert's key, 2528 * as that isn't done as part of chain building/verification currently 2529 * - builds and verifies the chain 2530 * - then calls the callback and merges the flags 2531 */ 2532 int mbedtls_x509_crt_verify_restartable( mbedtls_x509_crt *crt, 2533 mbedtls_x509_crt *trust_ca, 2534 mbedtls_x509_crl *ca_crl, 2535 const mbedtls_x509_crt_profile *profile, 2536 const char *cn, uint32_t *flags, 2537 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 2538 void *p_vrfy, 2539 mbedtls_x509_crt_restart_ctx *rs_ctx ) 2540 { 2541 int ret; 2542 mbedtls_pk_type_t pk_type; 2543 mbedtls_x509_crt_verify_chain ver_chain; 2544 uint32_t ee_flags; 2545 2546 *flags = 0; 2547 ee_flags = 0; 2548 x509_crt_verify_chain_reset( &ver_chain ); 2549 2550 if( profile == NULL ) 2551 { 2552 ret = MBEDTLS_ERR_X509_BAD_INPUT_DATA; 2553 goto exit; 2554 } 2555 2556 /* check name if requested */ 2557 if( cn != NULL ) 2558 x509_crt_verify_name( crt, cn, &ee_flags ); 2559 2560 /* Check the type and size of the key */ 2561 pk_type = mbedtls_pk_get_type( &crt->pk ); 2562 2563 if( x509_profile_check_pk_alg( profile, pk_type ) != 0 ) 2564 ee_flags |= MBEDTLS_X509_BADCERT_BAD_PK; 2565 2566 if( x509_profile_check_key( profile, &crt->pk ) != 0 ) 2567 ee_flags |= MBEDTLS_X509_BADCERT_BAD_KEY; 2568 2569 /* Check the chain */ 2570 ret = x509_crt_verify_chain( crt, trust_ca, ca_crl, profile, 2571 &ver_chain, rs_ctx ); 2572 2573 if( ret != 0 ) 2574 goto exit; 2575 2576 /* Merge end-entity flags */ 2577 ver_chain.items[0].flags |= ee_flags; 2578 2579 /* Build final flags, calling callback on the way if any */ 2580 ret = x509_crt_merge_flags_with_cb( flags, &ver_chain, f_vrfy, p_vrfy ); 2581 2582 exit: 2583 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2584 if( rs_ctx != NULL && ret != MBEDTLS_ERR_ECP_IN_PROGRESS ) 2585 mbedtls_x509_crt_restart_free( rs_ctx ); 2586 #endif 2587 2588 /* prevent misuse of the vrfy callback - VERIFY_FAILED would be ignored by 2589 * the SSL module for authmode optional, but non-zero return from the 2590 * callback means a fatal error so it shouldn't be ignored */ 2591 if( ret == MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ) 2592 ret = MBEDTLS_ERR_X509_FATAL_ERROR; 2593 2594 if( ret != 0 ) 2595 { 2596 *flags = (uint32_t) -1; 2597 return( ret ); 2598 } 2599 2600 if( *flags != 0 ) 2601 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ); 2602 2603 return( 0 ); 2604 } 2605 2606 /* 2607 * Initialize a certificate chain 2608 */ 2609 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt ) 2610 { 2611 memset( crt, 0, sizeof(mbedtls_x509_crt) ); 2612 } 2613 2614 /* 2615 * Unallocate all certificate data 2616 */ 2617 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt ) 2618 { 2619 mbedtls_x509_crt *cert_cur = crt; 2620 mbedtls_x509_crt *cert_prv; 2621 mbedtls_x509_name *name_cur; 2622 mbedtls_x509_name *name_prv; 2623 mbedtls_x509_sequence *seq_cur; 2624 mbedtls_x509_sequence *seq_prv; 2625 2626 if( crt == NULL ) 2627 return; 2628 2629 do 2630 { 2631 mbedtls_pk_free( &cert_cur->pk ); 2632 2633 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) 2634 mbedtls_free( cert_cur->sig_opts ); 2635 #endif 2636 2637 name_cur = cert_cur->issuer.next; 2638 while( name_cur != NULL ) 2639 { 2640 name_prv = name_cur; 2641 name_cur = name_cur->next; 2642 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); 2643 mbedtls_free( name_prv ); 2644 } 2645 2646 name_cur = cert_cur->subject.next; 2647 while( name_cur != NULL ) 2648 { 2649 name_prv = name_cur; 2650 name_cur = name_cur->next; 2651 mbedtls_platform_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); 2652 mbedtls_free( name_prv ); 2653 } 2654 2655 seq_cur = cert_cur->ext_key_usage.next; 2656 while( seq_cur != NULL ) 2657 { 2658 seq_prv = seq_cur; 2659 seq_cur = seq_cur->next; 2660 mbedtls_platform_zeroize( seq_prv, 2661 sizeof( mbedtls_x509_sequence ) ); 2662 mbedtls_free( seq_prv ); 2663 } 2664 2665 seq_cur = cert_cur->subject_alt_names.next; 2666 while( seq_cur != NULL ) 2667 { 2668 seq_prv = seq_cur; 2669 seq_cur = seq_cur->next; 2670 mbedtls_platform_zeroize( seq_prv, 2671 sizeof( mbedtls_x509_sequence ) ); 2672 mbedtls_free( seq_prv ); 2673 } 2674 2675 if( cert_cur->raw.p != NULL ) 2676 { 2677 mbedtls_platform_zeroize( cert_cur->raw.p, cert_cur->raw.len ); 2678 mbedtls_free( cert_cur->raw.p ); 2679 } 2680 2681 cert_cur = cert_cur->next; 2682 } 2683 while( cert_cur != NULL ); 2684 2685 cert_cur = crt; 2686 do 2687 { 2688 cert_prv = cert_cur; 2689 cert_cur = cert_cur->next; 2690 2691 mbedtls_platform_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) ); 2692 if( cert_prv != crt ) 2693 mbedtls_free( cert_prv ); 2694 } 2695 while( cert_cur != NULL ); 2696 } 2697 2698 #if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE) 2699 /* 2700 * Initialize a restart context 2701 */ 2702 void mbedtls_x509_crt_restart_init( mbedtls_x509_crt_restart_ctx *ctx ) 2703 { 2704 mbedtls_pk_restart_init( &ctx->pk ); 2705 2706 ctx->parent = NULL; 2707 ctx->fallback_parent = NULL; 2708 ctx->fallback_signature_is_good = 0; 2709 2710 ctx->parent_is_trusted = -1; 2711 2712 ctx->in_progress = x509_crt_rs_none; 2713 ctx->self_cnt = 0; 2714 x509_crt_verify_chain_reset( &ctx->ver_chain ); 2715 } 2716 2717 /* 2718 * Free the components of a restart context 2719 */ 2720 void mbedtls_x509_crt_restart_free( mbedtls_x509_crt_restart_ctx *ctx ) 2721 { 2722 if( ctx == NULL ) 2723 return; 2724 2725 mbedtls_pk_restart_free( &ctx->pk ); 2726 mbedtls_x509_crt_restart_init( ctx ); 2727 } 2728 #endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */ 2729 2730 #endif /* MBEDTLS_X509_CRT_PARSE_C */ 2731