Jan Korycan
/
WNCInterface
Important changes to repositories hosted on mbed.com
Mbed hosted mercurial repositories are deprecated and are due to be permanently deleted in July 2026.
To keep a copy of this software download the repository Zip archive or clone locally using Mercurial.
It is also possible to export all your personal repositories from the account settings page.
Dependencies: WncControllerK64F
Fork of
WNCInterface
by 
Jan Korycan
Embed:
(wiki syntax)
Show/hide line numbers
x509_crt.c
00001 /* 00002 * X.509 certificate parsing and verification 00003 * 00004 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved 00005 * SPDX-License-Identifier: Apache-2.0 00006 * 00007 * Licensed under the Apache License, Version 2.0 (the "License"); you may 00008 * not use this file except in compliance with the License. 00009 * You may obtain a copy of the License at 00010 * 00011 * http://www.apache.org/licenses/LICENSE-2.0 00012 * 00013 * Unless required by applicable law or agreed to in writing, software 00014 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT 00015 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 00016 * See the License for the specific language governing permissions and 00017 * limitations under the License. 00018 * 00019 * This file is part of mbed TLS (https://tls.mbed.org) 00020 */ 00021 /* 00022 * The ITU-T X.509 standard defines a certificate format for PKI. 00023 * 00024 * http://www.ietf.org/rfc/rfc5280.txt (Certificates and CRLs) 00025 * http://www.ietf.org/rfc/rfc3279.txt (Alg IDs for CRLs) 00026 * http://www.ietf.org/rfc/rfc2986.txt (CSRs, aka PKCS#10) 00027 * 00028 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.680-0207.pdf 00029 * http://www.itu.int/ITU-T/studygroups/com17/languages/X.690-0207.pdf 00030 */ 00031 00032 #if !defined(MBEDTLS_CONFIG_FILE) 00033 #include "mbedtls/config.h" 00034 #else 00035 #include MBEDTLS_CONFIG_FILE 00036 #endif 00037 00038 #if defined(MBEDTLS_X509_CRT_PARSE_C) 00039 00040 #include "mbedtls/x509_crt.h" 00041 #include "mbedtls/oid.h" 00042 00043 #include <stdio.h> 00044 #include <string.h> 00045 00046 #if defined(MBEDTLS_PEM_PARSE_C) 00047 #include "mbedtls/pem.h" 00048 #endif 00049 00050 #if defined(MBEDTLS_PLATFORM_C) 00051 #include "mbedtls/platform.h" 00052 #else 00053 #include <stdlib.h> 00054 #define mbedtls_free free 00055 #define mbedtls_calloc calloc 00056 #define mbedtls_snprintf snprintf 00057 #endif 00058 00059 #if defined(MBEDTLS_THREADING_C) 00060 #include "mbedtls/threading.h" 00061 #endif 00062 00063 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) 00064 #include <windows.h> 00065 #else 00066 #include <time.h> 00067 #endif 00068 00069 #if defined(MBEDTLS_FS_IO) 00070 #include <stdio.h> 00071 #if !defined(_WIN32) || defined(EFIX64) || defined(EFI32) 00072 #include <sys/types.h> 00073 #include <sys/stat.h> 00074 #include <dirent.h> 00075 #endif /* !_WIN32 || EFIX64 || EFI32 */ 00076 #endif 00077 00078 /* Implementation that should never be optimized out by the compiler */ 00079 static void mbedtls_zeroize( void *v, size_t n ) { 00080 volatile unsigned char *p = v; while( n-- ) *p++ = 0; 00081 } 00082 00083 /* 00084 * Default profile 00085 */ 00086 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_default = 00087 { 00088 /* Hashes from SHA-1 and above */ 00089 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA1 ) | 00090 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_RIPEMD160 ) | 00091 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA224 ) | 00092 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | 00093 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | 00094 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), 00095 0xFFFFFFF, /* Any PK alg */ 00096 0xFFFFFFF, /* Any curve */ 00097 2048, 00098 }; 00099 00100 /* 00101 * Next-default profile 00102 */ 00103 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_next = 00104 { 00105 /* Hashes from SHA-256 and above */ 00106 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | 00107 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ) | 00108 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA512 ), 00109 0xFFFFFFF, /* Any PK alg */ 00110 #if defined(MBEDTLS_ECP_C) 00111 /* Curves at or above 128-bit security level */ 00112 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | 00113 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ) | 00114 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP521R1 ) | 00115 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP256R1 ) | 00116 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP384R1 ) | 00117 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_BP512R1 ) | 00118 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256K1 ), 00119 #else 00120 0, 00121 #endif 00122 2048, 00123 }; 00124 00125 /* 00126 * NSA Suite B Profile 00127 */ 00128 const mbedtls_x509_crt_profile mbedtls_x509_crt_profile_suiteb = 00129 { 00130 /* Only SHA-256 and 384 */ 00131 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA256 ) | 00132 MBEDTLS_X509_ID_FLAG( MBEDTLS_MD_SHA384 ), 00133 /* Only ECDSA */ 00134 MBEDTLS_X509_ID_FLAG( MBEDTLS_PK_ECDSA ), 00135 #if defined(MBEDTLS_ECP_C) 00136 /* Only NIST P-256 and P-384 */ 00137 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP256R1 ) | 00138 MBEDTLS_X509_ID_FLAG( MBEDTLS_ECP_DP_SECP384R1 ), 00139 #else 00140 0, 00141 #endif 00142 0, 00143 }; 00144 00145 /* 00146 * Check md_alg against profile 00147 * Return 0 if md_alg acceptable for this profile, -1 otherwise 00148 */ 00149 static int x509_profile_check_md_alg( const mbedtls_x509_crt_profile *profile, 00150 mbedtls_md_type_t md_alg ) 00151 { 00152 if( ( profile->allowed_mds & MBEDTLS_X509_ID_FLAG( md_alg ) ) != 0 ) 00153 return( 0 ); 00154 00155 return( -1 ); 00156 } 00157 00158 /* 00159 * Check pk_alg against profile 00160 * Return 0 if pk_alg acceptable for this profile, -1 otherwise 00161 */ 00162 static int x509_profile_check_pk_alg( const mbedtls_x509_crt_profile *profile, 00163 mbedtls_pk_type_t pk_alg ) 00164 { 00165 if( ( profile->allowed_pks & MBEDTLS_X509_ID_FLAG( pk_alg ) ) != 0 ) 00166 return( 0 ); 00167 00168 return( -1 ); 00169 } 00170 00171 /* 00172 * Check key against profile 00173 * Return 0 if pk_alg acceptable for this profile, -1 otherwise 00174 */ 00175 static int x509_profile_check_key( const mbedtls_x509_crt_profile *profile, 00176 mbedtls_pk_type_t pk_alg, 00177 const mbedtls_pk_context *pk ) 00178 { 00179 #if defined(MBEDTLS_RSA_C) 00180 if( pk_alg == MBEDTLS_PK_RSA || pk_alg == MBEDTLS_PK_RSASSA_PSS ) 00181 { 00182 if( mbedtls_pk_get_bitlen( pk ) >= profile->rsa_min_bitlen ) 00183 return( 0 ); 00184 00185 return( -1 ); 00186 } 00187 #endif 00188 00189 #if defined(MBEDTLS_ECP_C) 00190 if( pk_alg == MBEDTLS_PK_ECDSA || 00191 pk_alg == MBEDTLS_PK_ECKEY || 00192 pk_alg == MBEDTLS_PK_ECKEY_DH ) 00193 { 00194 mbedtls_ecp_group_id gid = mbedtls_pk_ec( *pk )->grp .id ; 00195 00196 if( ( profile->allowed_curves & MBEDTLS_X509_ID_FLAG( gid ) ) != 0 ) 00197 return( 0 ); 00198 00199 return( -1 ); 00200 } 00201 #endif 00202 00203 return( -1 ); 00204 } 00205 00206 /* 00207 * Version ::= INTEGER { v1(0), v2(1), v3(2) } 00208 */ 00209 static int x509_get_version( unsigned char **p, 00210 const unsigned char *end, 00211 int *ver ) 00212 { 00213 int ret; 00214 size_t len; 00215 00216 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 00217 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | 0 ) ) != 0 ) 00218 { 00219 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) 00220 { 00221 *ver = 0; 00222 return( 0 ); 00223 } 00224 00225 return( ret ); 00226 } 00227 00228 end = *p + len; 00229 00230 if( ( ret = mbedtls_asn1_get_int( p, end, ver ) ) != 0 ) 00231 return( MBEDTLS_ERR_X509_INVALID_VERSION + ret ); 00232 00233 if( *p != end ) 00234 return( MBEDTLS_ERR_X509_INVALID_VERSION + 00235 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00236 00237 return( 0 ); 00238 } 00239 00240 /* 00241 * Validity ::= SEQUENCE { 00242 * notBefore Time, 00243 * notAfter Time } 00244 */ 00245 static int x509_get_dates( unsigned char **p, 00246 const unsigned char *end, 00247 mbedtls_x509_time *from, 00248 mbedtls_x509_time *to ) 00249 { 00250 int ret; 00251 size_t len; 00252 00253 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 00254 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00255 return( MBEDTLS_ERR_X509_INVALID_DATE + ret ); 00256 00257 end = *p + len; 00258 00259 if( ( ret = mbedtls_x509_get_time( p, end, from ) ) != 0 ) 00260 return( ret ); 00261 00262 if( ( ret = mbedtls_x509_get_time( p, end, to ) ) != 0 ) 00263 return( ret ); 00264 00265 if( *p != end ) 00266 return( MBEDTLS_ERR_X509_INVALID_DATE + 00267 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00268 00269 return( 0 ); 00270 } 00271 00272 /* 00273 * X.509 v2/v3 unique identifier (not parsed) 00274 */ 00275 static int x509_get_uid( unsigned char **p, 00276 const unsigned char *end, 00277 mbedtls_x509_buf *uid, int n ) 00278 { 00279 int ret; 00280 00281 if( *p == end ) 00282 return( 0 ); 00283 00284 uid->tag = **p; 00285 00286 if( ( ret = mbedtls_asn1_get_tag( p, end, &uid->len, 00287 MBEDTLS_ASN1_CONTEXT_SPECIFIC | MBEDTLS_ASN1_CONSTRUCTED | n ) ) != 0 ) 00288 { 00289 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) 00290 return( 0 ); 00291 00292 return( ret ); 00293 } 00294 00295 uid->p = *p; 00296 *p += uid->len; 00297 00298 return( 0 ); 00299 } 00300 00301 static int x509_get_basic_constraints( unsigned char **p, 00302 const unsigned char *end, 00303 int *ca_istrue, 00304 int *max_pathlen ) 00305 { 00306 int ret; 00307 size_t len; 00308 00309 /* 00310 * BasicConstraints ::= SEQUENCE { 00311 * cA BOOLEAN DEFAULT FALSE, 00312 * pathLenConstraint INTEGER (0..MAX) OPTIONAL } 00313 */ 00314 *ca_istrue = 0; /* DEFAULT FALSE */ 00315 *max_pathlen = 0; /* endless */ 00316 00317 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 00318 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00319 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00320 00321 if( *p == end ) 00322 return( 0 ); 00323 00324 if( ( ret = mbedtls_asn1_get_bool( p, end, ca_istrue ) ) != 0 ) 00325 { 00326 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) 00327 ret = mbedtls_asn1_get_int( p, end, ca_istrue ); 00328 00329 if( ret != 0 ) 00330 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00331 00332 if( *ca_istrue != 0 ) 00333 *ca_istrue = 1; 00334 } 00335 00336 if( *p == end ) 00337 return( 0 ); 00338 00339 if( ( ret = mbedtls_asn1_get_int( p, end, max_pathlen ) ) != 0 ) 00340 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00341 00342 if( *p != end ) 00343 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00344 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00345 00346 (*max_pathlen)++; 00347 00348 return( 0 ); 00349 } 00350 00351 static int x509_get_ns_cert_type( unsigned char **p, 00352 const unsigned char *end, 00353 unsigned char *ns_cert_type) 00354 { 00355 int ret; 00356 mbedtls_x509_bitstring bs = { 0, 0, NULL }; 00357 00358 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) 00359 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00360 00361 if( bs.len != 1 ) 00362 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00363 MBEDTLS_ERR_ASN1_INVALID_LENGTH ); 00364 00365 /* Get actual bitstring */ 00366 *ns_cert_type = *bs.p; 00367 return( 0 ); 00368 } 00369 00370 static int x509_get_key_usage( unsigned char **p, 00371 const unsigned char *end, 00372 unsigned int *key_usage) 00373 { 00374 int ret; 00375 size_t i; 00376 mbedtls_x509_bitstring bs = { 0, 0, NULL }; 00377 00378 if( ( ret = mbedtls_asn1_get_bitstring( p, end, &bs ) ) != 0 ) 00379 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00380 00381 if( bs.len < 1 ) 00382 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00383 MBEDTLS_ERR_ASN1_INVALID_LENGTH ); 00384 00385 /* Get actual bitstring */ 00386 *key_usage = 0; 00387 for( i = 0; i < bs.len && i < sizeof( unsigned int ); i++ ) 00388 { 00389 *key_usage |= (unsigned int) bs.p[i] << (8*i); 00390 } 00391 00392 return( 0 ); 00393 } 00394 00395 /* 00396 * ExtKeyUsageSyntax ::= SEQUENCE SIZE (1..MAX) OF KeyPurposeId 00397 * 00398 * KeyPurposeId ::= OBJECT IDENTIFIER 00399 */ 00400 static int x509_get_ext_key_usage( unsigned char **p, 00401 const unsigned char *end, 00402 mbedtls_x509_sequence *ext_key_usage) 00403 { 00404 int ret; 00405 00406 if( ( ret = mbedtls_asn1_get_sequence_of( p, end, ext_key_usage, MBEDTLS_ASN1_OID ) ) != 0 ) 00407 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00408 00409 /* Sequence length must be >= 1 */ 00410 if( ext_key_usage->buf.p == NULL ) 00411 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00412 MBEDTLS_ERR_ASN1_INVALID_LENGTH ); 00413 00414 return( 0 ); 00415 } 00416 00417 /* 00418 * SubjectAltName ::= GeneralNames 00419 * 00420 * GeneralNames ::= SEQUENCE SIZE (1..MAX) OF GeneralName 00421 * 00422 * GeneralName ::= CHOICE { 00423 * otherName [0] OtherName, 00424 * rfc822Name [1] IA5String, 00425 * dNSName [2] IA5String, 00426 * x400Address [3] ORAddress, 00427 * directoryName [4] Name, 00428 * ediPartyName [5] EDIPartyName, 00429 * uniformResourceIdentifier [6] IA5String, 00430 * iPAddress [7] OCTET STRING, 00431 * registeredID [8] OBJECT IDENTIFIER } 00432 * 00433 * OtherName ::= SEQUENCE { 00434 * type-id OBJECT IDENTIFIER, 00435 * value [0] EXPLICIT ANY DEFINED BY type-id } 00436 * 00437 * EDIPartyName ::= SEQUENCE { 00438 * nameAssigner [0] DirectoryString OPTIONAL, 00439 * partyName [1] DirectoryString } 00440 * 00441 * NOTE: we only parse and use dNSName at this point. 00442 */ 00443 static int x509_get_subject_alt_name( unsigned char **p, 00444 const unsigned char *end, 00445 mbedtls_x509_sequence *subject_alt_name ) 00446 { 00447 int ret; 00448 size_t len, tag_len; 00449 mbedtls_asn1_buf *buf; 00450 unsigned char tag; 00451 mbedtls_asn1_sequence *cur = subject_alt_name; 00452 00453 /* Get main sequence tag */ 00454 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 00455 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00456 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00457 00458 if( *p + len != end ) 00459 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00460 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00461 00462 while( *p < end ) 00463 { 00464 if( ( end - *p ) < 1 ) 00465 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00466 MBEDTLS_ERR_ASN1_OUT_OF_DATA ); 00467 00468 tag = **p; 00469 (*p)++; 00470 if( ( ret = mbedtls_asn1_get_len( p, end, &tag_len ) ) != 0 ) 00471 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00472 00473 if( ( tag & MBEDTLS_ASN1_CONTEXT_SPECIFIC ) != MBEDTLS_ASN1_CONTEXT_SPECIFIC ) 00474 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00475 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); 00476 00477 /* Skip everything but DNS name */ 00478 if( tag != ( MBEDTLS_ASN1_CONTEXT_SPECIFIC | 2 ) ) 00479 { 00480 *p += tag_len; 00481 continue; 00482 } 00483 00484 /* Allocate and assign next pointer */ 00485 if( cur->buf.p != NULL ) 00486 { 00487 if( cur->next != NULL ) 00488 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); 00489 00490 cur->next = mbedtls_calloc( 1, sizeof( mbedtls_asn1_sequence ) ); 00491 00492 if( cur->next == NULL ) 00493 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00494 MBEDTLS_ERR_ASN1_ALLOC_FAILED ); 00495 00496 cur = cur->next; 00497 } 00498 00499 buf = &(cur->buf); 00500 buf->tag = tag; 00501 buf->p = *p; 00502 buf->len = tag_len; 00503 *p += buf->len; 00504 } 00505 00506 /* Set final sequence entry's next pointer to NULL */ 00507 cur->next = NULL; 00508 00509 if( *p != end ) 00510 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00511 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00512 00513 return( 0 ); 00514 } 00515 00516 /* 00517 * X.509 v3 extensions 00518 * 00519 */ 00520 static int x509_get_crt_ext( unsigned char **p, 00521 const unsigned char *end, 00522 mbedtls_x509_crt *crt ) 00523 { 00524 int ret; 00525 size_t len; 00526 unsigned char *end_ext_data, *end_ext_octet; 00527 00528 if( ( ret = mbedtls_x509_get_ext( p, end, &crt->v3_ext, 3 ) ) != 0 ) 00529 { 00530 if( ret == MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) 00531 return( 0 ); 00532 00533 return( ret ); 00534 } 00535 00536 while( *p < end ) 00537 { 00538 /* 00539 * Extension ::= SEQUENCE { 00540 * extnID OBJECT IDENTIFIER, 00541 * critical BOOLEAN DEFAULT FALSE, 00542 * extnValue OCTET STRING } 00543 */ 00544 mbedtls_x509_buf extn_oid = {0, 0, NULL}; 00545 int is_critical = 0; /* DEFAULT FALSE */ 00546 int ext_type = 0; 00547 00548 if( ( ret = mbedtls_asn1_get_tag( p, end, &len, 00549 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00550 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00551 00552 end_ext_data = *p + len; 00553 00554 /* Get extension ID */ 00555 extn_oid.tag = **p; 00556 00557 if( ( ret = mbedtls_asn1_get_tag( p, end, &extn_oid.len, MBEDTLS_ASN1_OID ) ) != 0 ) 00558 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00559 00560 extn_oid.p = *p; 00561 *p += extn_oid.len; 00562 00563 if( ( end - *p ) < 1 ) 00564 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00565 MBEDTLS_ERR_ASN1_OUT_OF_DATA ); 00566 00567 /* Get optional critical */ 00568 if( ( ret = mbedtls_asn1_get_bool( p, end_ext_data, &is_critical ) ) != 0 && 00569 ( ret != MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ) ) 00570 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00571 00572 /* Data should be octet string type */ 00573 if( ( ret = mbedtls_asn1_get_tag( p, end_ext_data, &len, 00574 MBEDTLS_ASN1_OCTET_STRING ) ) != 0 ) 00575 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + ret ); 00576 00577 end_ext_octet = *p + len; 00578 00579 if( end_ext_octet != end_ext_data ) 00580 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00581 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00582 00583 /* 00584 * Detect supported extensions 00585 */ 00586 ret = mbedtls_oid_get_x509_ext_type( &extn_oid, &ext_type ); 00587 00588 if( ret != 0 ) 00589 { 00590 /* No parser found, skip extension */ 00591 *p = end_ext_octet; 00592 00593 #if !defined(MBEDTLS_X509_ALLOW_UNSUPPORTED_CRITICAL_EXTENSION) 00594 if( is_critical ) 00595 { 00596 /* Data is marked as critical: fail */ 00597 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00598 MBEDTLS_ERR_ASN1_UNEXPECTED_TAG ); 00599 } 00600 #endif 00601 continue; 00602 } 00603 00604 /* Forbid repeated extensions */ 00605 if( ( crt->ext_types & ext_type ) != 0 ) 00606 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS ); 00607 00608 crt->ext_types |= ext_type; 00609 00610 switch( ext_type ) 00611 { 00612 case MBEDTLS_X509_EXT_BASIC_CONSTRAINTS: 00613 /* Parse basic constraints */ 00614 if( ( ret = x509_get_basic_constraints( p, end_ext_octet, 00615 &crt->ca_istrue, &crt->max_pathlen ) ) != 0 ) 00616 return( ret ); 00617 break; 00618 00619 case MBEDTLS_X509_EXT_KEY_USAGE: 00620 /* Parse key usage */ 00621 if( ( ret = x509_get_key_usage( p, end_ext_octet, 00622 &crt->key_usage ) ) != 0 ) 00623 return( ret ); 00624 break; 00625 00626 case MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE: 00627 /* Parse extended key usage */ 00628 if( ( ret = x509_get_ext_key_usage( p, end_ext_octet, 00629 &crt->ext_key_usage ) ) != 0 ) 00630 return( ret ); 00631 break; 00632 00633 case MBEDTLS_X509_EXT_SUBJECT_ALT_NAME: 00634 /* Parse subject alt name */ 00635 if( ( ret = x509_get_subject_alt_name( p, end_ext_octet, 00636 &crt->subject_alt_names ) ) != 0 ) 00637 return( ret ); 00638 break; 00639 00640 case MBEDTLS_X509_EXT_NS_CERT_TYPE: 00641 /* Parse netscape certificate type */ 00642 if( ( ret = x509_get_ns_cert_type( p, end_ext_octet, 00643 &crt->ns_cert_type ) ) != 0 ) 00644 return( ret ); 00645 break; 00646 00647 default: 00648 return( MBEDTLS_ERR_X509_FEATURE_UNAVAILABLE ); 00649 } 00650 } 00651 00652 if( *p != end ) 00653 return( MBEDTLS_ERR_X509_INVALID_EXTENSIONS + 00654 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00655 00656 return( 0 ); 00657 } 00658 00659 /* 00660 * Parse and fill a single X.509 certificate in DER format 00661 */ 00662 static int x509_crt_parse_der_core( mbedtls_x509_crt *crt, const unsigned char *buf, 00663 size_t buflen ) 00664 { 00665 int ret; 00666 size_t len; 00667 unsigned char *p, *end, *crt_end; 00668 mbedtls_x509_buf sig_params1, sig_params2, sig_oid2; 00669 00670 memset( &sig_params1, 0, sizeof( mbedtls_x509_buf ) ); 00671 memset( &sig_params2, 0, sizeof( mbedtls_x509_buf ) ); 00672 memset( &sig_oid2, 0, sizeof( mbedtls_x509_buf ) ); 00673 00674 /* 00675 * Check for valid input 00676 */ 00677 if( crt == NULL || buf == NULL ) 00678 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 00679 00680 // Use the original buffer until we figure out actual length 00681 p = (unsigned char*) buf; 00682 len = buflen; 00683 end = p + len; 00684 00685 /* 00686 * Certificate ::= SEQUENCE { 00687 * tbsCertificate TBSCertificate, 00688 * signatureAlgorithm AlgorithmIdentifier, 00689 * signatureValue BIT STRING } 00690 */ 00691 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 00692 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00693 { 00694 mbedtls_x509_crt_free( crt ); 00695 return( MBEDTLS_ERR_X509_INVALID_FORMAT ); 00696 } 00697 00698 if( len > (size_t) ( end - p ) ) 00699 { 00700 mbedtls_x509_crt_free( crt ); 00701 return( MBEDTLS_ERR_X509_INVALID_FORMAT + 00702 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00703 } 00704 crt_end = p + len; 00705 00706 // Create and populate a new buffer for the raw field 00707 crt->raw.len = crt_end - buf; 00708 crt->raw.p = p = mbedtls_calloc( 1, crt->raw.len ); 00709 if( p == NULL ) 00710 return( MBEDTLS_ERR_X509_ALLOC_FAILED ); 00711 00712 memcpy( p, buf, crt->raw.len ); 00713 00714 // Direct pointers to the new buffer 00715 p += crt->raw.len - len; 00716 end = crt_end = p + len; 00717 00718 /* 00719 * TBSCertificate ::= SEQUENCE { 00720 */ 00721 crt->tbs.p = p; 00722 00723 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 00724 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00725 { 00726 mbedtls_x509_crt_free( crt ); 00727 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 00728 } 00729 00730 end = p + len; 00731 crt->tbs.len = end - crt->tbs.p; 00732 00733 /* 00734 * Version ::= INTEGER { v1(0), v2(1), v3(2) } 00735 * 00736 * CertificateSerialNumber ::= INTEGER 00737 * 00738 * signature AlgorithmIdentifier 00739 */ 00740 if( ( ret = x509_get_version( &p, end, &crt->version ) ) != 0 || 00741 ( ret = mbedtls_x509_get_serial( &p, end, &crt->serial ) ) != 0 || 00742 ( ret = mbedtls_x509_get_alg( &p, end, &crt->sig_oid, 00743 &sig_params1 ) ) != 0 ) 00744 { 00745 mbedtls_x509_crt_free( crt ); 00746 return( ret ); 00747 } 00748 00749 crt->version++; 00750 00751 if( crt->version > 3 ) 00752 { 00753 mbedtls_x509_crt_free( crt ); 00754 return( MBEDTLS_ERR_X509_UNKNOWN_VERSION ); 00755 } 00756 00757 if( ( ret = mbedtls_x509_get_sig_alg( &crt->sig_oid, &sig_params1, 00758 &crt->sig_md, &crt->sig_pk, 00759 &crt->sig_opts ) ) != 0 ) 00760 { 00761 mbedtls_x509_crt_free( crt ); 00762 return( ret ); 00763 } 00764 00765 /* 00766 * issuer Name 00767 */ 00768 crt->issuer_raw.p = p; 00769 00770 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 00771 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00772 { 00773 mbedtls_x509_crt_free( crt ); 00774 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 00775 } 00776 00777 if( ( ret = mbedtls_x509_get_name( &p, p + len, &crt->issuer ) ) != 0 ) 00778 { 00779 mbedtls_x509_crt_free( crt ); 00780 return( ret ); 00781 } 00782 00783 crt->issuer_raw.len = p - crt->issuer_raw.p; 00784 00785 /* 00786 * Validity ::= SEQUENCE { 00787 * notBefore Time, 00788 * notAfter Time } 00789 * 00790 */ 00791 if( ( ret = x509_get_dates( &p, end, &crt->valid_from, 00792 &crt->valid_to ) ) != 0 ) 00793 { 00794 mbedtls_x509_crt_free( crt ); 00795 return( ret ); 00796 } 00797 00798 /* 00799 * subject Name 00800 */ 00801 crt->subject_raw.p = p; 00802 00803 if( ( ret = mbedtls_asn1_get_tag( &p, end, &len, 00804 MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE ) ) != 0 ) 00805 { 00806 mbedtls_x509_crt_free( crt ); 00807 return( MBEDTLS_ERR_X509_INVALID_FORMAT + ret ); 00808 } 00809 00810 if( len && ( ret = mbedtls_x509_get_name( &p, p + len, &crt->subject ) ) != 0 ) 00811 { 00812 mbedtls_x509_crt_free( crt ); 00813 return( ret ); 00814 } 00815 00816 crt->subject_raw.len = p - crt->subject_raw.p; 00817 00818 /* 00819 * SubjectPublicKeyInfo 00820 */ 00821 if( ( ret = mbedtls_pk_parse_subpubkey( &p, end, &crt->pk ) ) != 0 ) 00822 { 00823 mbedtls_x509_crt_free( crt ); 00824 return( ret ); 00825 } 00826 00827 /* 00828 * issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL, 00829 * -- If present, version shall be v2 or v3 00830 * subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL, 00831 * -- If present, version shall be v2 or v3 00832 * extensions [3] EXPLICIT Extensions OPTIONAL 00833 * -- If present, version shall be v3 00834 */ 00835 if( crt->version == 2 || crt->version == 3 ) 00836 { 00837 ret = x509_get_uid( &p, end, &crt->issuer_id, 1 ); 00838 if( ret != 0 ) 00839 { 00840 mbedtls_x509_crt_free( crt ); 00841 return( ret ); 00842 } 00843 } 00844 00845 if( crt->version == 2 || crt->version == 3 ) 00846 { 00847 ret = x509_get_uid( &p, end, &crt->subject_id, 2 ); 00848 if( ret != 0 ) 00849 { 00850 mbedtls_x509_crt_free( crt ); 00851 return( ret ); 00852 } 00853 } 00854 00855 #if !defined(MBEDTLS_X509_ALLOW_EXTENSIONS_NON_V3) 00856 if( crt->version == 3 ) 00857 #endif 00858 { 00859 ret = x509_get_crt_ext( &p, end, crt ); 00860 if( ret != 0 ) 00861 { 00862 mbedtls_x509_crt_free( crt ); 00863 return( ret ); 00864 } 00865 } 00866 00867 if( p != end ) 00868 { 00869 mbedtls_x509_crt_free( crt ); 00870 return( MBEDTLS_ERR_X509_INVALID_FORMAT + 00871 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00872 } 00873 00874 end = crt_end; 00875 00876 /* 00877 * } 00878 * -- end of TBSCertificate 00879 * 00880 * signatureAlgorithm AlgorithmIdentifier, 00881 * signatureValue BIT STRING 00882 */ 00883 if( ( ret = mbedtls_x509_get_alg( &p, end, &sig_oid2, &sig_params2 ) ) != 0 ) 00884 { 00885 mbedtls_x509_crt_free( crt ); 00886 return( ret ); 00887 } 00888 00889 if( crt->sig_oid.len != sig_oid2.len || 00890 memcmp( crt->sig_oid.p, sig_oid2.p, crt->sig_oid.len ) != 0 || 00891 sig_params1.len != sig_params2.len || 00892 ( sig_params1.len != 0 && 00893 memcmp( sig_params1.p, sig_params2.p, sig_params1.len ) != 0 ) ) 00894 { 00895 mbedtls_x509_crt_free( crt ); 00896 return( MBEDTLS_ERR_X509_SIG_MISMATCH ); 00897 } 00898 00899 if( ( ret = mbedtls_x509_get_sig( &p, end, &crt->sig ) ) != 0 ) 00900 { 00901 mbedtls_x509_crt_free( crt ); 00902 return( ret ); 00903 } 00904 00905 if( p != end ) 00906 { 00907 mbedtls_x509_crt_free( crt ); 00908 return( MBEDTLS_ERR_X509_INVALID_FORMAT + 00909 MBEDTLS_ERR_ASN1_LENGTH_MISMATCH ); 00910 } 00911 00912 return( 0 ); 00913 } 00914 00915 /* 00916 * Parse one X.509 certificate in DER format from a buffer and add them to a 00917 * chained list 00918 */ 00919 int mbedtls_x509_crt_parse_der( mbedtls_x509_crt *chain, const unsigned char *buf, 00920 size_t buflen ) 00921 { 00922 int ret; 00923 mbedtls_x509_crt *crt = chain, *prev = NULL; 00924 00925 /* 00926 * Check for valid input 00927 */ 00928 if( crt == NULL || buf == NULL ) 00929 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 00930 00931 while( crt->version != 0 && crt->next != NULL ) 00932 { 00933 prev = crt; 00934 crt = crt->next; 00935 } 00936 00937 /* 00938 * Add new certificate on the end of the chain if needed. 00939 */ 00940 if( crt->version != 0 && crt->next == NULL ) 00941 { 00942 crt->next = mbedtls_calloc( 1, sizeof( mbedtls_x509_crt ) ); 00943 00944 if( crt->next == NULL ) 00945 return( MBEDTLS_ERR_X509_ALLOC_FAILED ); 00946 00947 prev = crt; 00948 mbedtls_x509_crt_init( crt->next ); 00949 crt = crt->next; 00950 } 00951 00952 if( ( ret = x509_crt_parse_der_core( crt, buf, buflen ) ) != 0 ) 00953 { 00954 if( prev ) 00955 prev->next = NULL; 00956 00957 if( crt != chain ) 00958 mbedtls_free( crt ); 00959 00960 return( ret ); 00961 } 00962 00963 return( 0 ); 00964 } 00965 00966 /* 00967 * Parse one or more PEM certificates from a buffer and add them to the chained 00968 * list 00969 */ 00970 int mbedtls_x509_crt_parse( mbedtls_x509_crt *chain, const unsigned char *buf, size_t buflen ) 00971 { 00972 int success = 0, first_error = 0, total_failed = 0; 00973 #if defined(MBEDTLS_PEM_PARSE_C) 00974 int buf_format = MBEDTLS_X509_FORMAT_DER; 00975 #endif 00976 00977 /* 00978 * Check for valid input 00979 */ 00980 if( chain == NULL || buf == NULL ) 00981 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 00982 00983 /* 00984 * Determine buffer content. Buffer contains either one DER certificate or 00985 * one or more PEM certificates. 00986 */ 00987 #if defined(MBEDTLS_PEM_PARSE_C) 00988 if( buflen != 0 && buf[buflen - 1] == '\0' && 00989 strstr( (const char *) buf, "-----BEGIN CERTIFICATE-----" ) != NULL ) 00990 { 00991 buf_format = MBEDTLS_X509_FORMAT_PEM; 00992 } 00993 00994 if( buf_format == MBEDTLS_X509_FORMAT_DER ) 00995 return mbedtls_x509_crt_parse_der( chain, buf, buflen ); 00996 #else 00997 return mbedtls_x509_crt_parse_der( chain, buf, buflen ); 00998 #endif 00999 01000 #if defined(MBEDTLS_PEM_PARSE_C) 01001 if( buf_format == MBEDTLS_X509_FORMAT_PEM ) 01002 { 01003 int ret; 01004 mbedtls_pem_context pem; 01005 01006 /* 1 rather than 0 since the terminating NULL byte is counted in */ 01007 while( buflen > 1 ) 01008 { 01009 size_t use_len; 01010 mbedtls_pem_init( &pem ); 01011 01012 /* If we get there, we know the string is null-terminated */ 01013 ret = mbedtls_pem_read_buffer( &pem, 01014 "-----BEGIN CERTIFICATE-----", 01015 "-----END CERTIFICATE-----", 01016 buf, NULL, 0, &use_len ); 01017 01018 if( ret == 0 ) 01019 { 01020 /* 01021 * Was PEM encoded 01022 */ 01023 buflen -= use_len; 01024 buf += use_len; 01025 } 01026 else if( ret == MBEDTLS_ERR_PEM_BAD_INPUT_DATA ) 01027 { 01028 return( ret ); 01029 } 01030 else if( ret != MBEDTLS_ERR_PEM_NO_HEADER_FOOTER_PRESENT ) 01031 { 01032 mbedtls_pem_free( &pem ); 01033 01034 /* 01035 * PEM header and footer were found 01036 */ 01037 buflen -= use_len; 01038 buf += use_len; 01039 01040 if( first_error == 0 ) 01041 first_error = ret; 01042 01043 total_failed++; 01044 continue; 01045 } 01046 else 01047 break; 01048 01049 ret = mbedtls_x509_crt_parse_der( chain, pem.buf , pem.buflen ); 01050 01051 mbedtls_pem_free( &pem ); 01052 01053 if( ret != 0 ) 01054 { 01055 /* 01056 * Quit parsing on a memory error 01057 */ 01058 if( ret == MBEDTLS_ERR_X509_ALLOC_FAILED ) 01059 return( ret ); 01060 01061 if( first_error == 0 ) 01062 first_error = ret; 01063 01064 total_failed++; 01065 continue; 01066 } 01067 01068 success = 1; 01069 } 01070 } 01071 01072 if( success ) 01073 return( total_failed ); 01074 else if( first_error ) 01075 return( first_error ); 01076 else 01077 return( MBEDTLS_ERR_X509_CERT_UNKNOWN_FORMAT ); 01078 #endif /* MBEDTLS_PEM_PARSE_C */ 01079 } 01080 01081 #if defined(MBEDTLS_FS_IO) 01082 /* 01083 * Load one or more certificates and add them to the chained list 01084 */ 01085 int mbedtls_x509_crt_parse_file( mbedtls_x509_crt *chain, const char *path ) 01086 { 01087 int ret; 01088 size_t n; 01089 unsigned char *buf; 01090 01091 if( ( ret = mbedtls_pk_load_file( path, &buf, &n ) ) != 0 ) 01092 return( ret ); 01093 01094 ret = mbedtls_x509_crt_parse( chain, buf, n ); 01095 01096 mbedtls_zeroize( buf, n ); 01097 mbedtls_free( buf ); 01098 01099 return( ret ); 01100 } 01101 01102 int mbedtls_x509_crt_parse_path( mbedtls_x509_crt *chain, const char *path ) 01103 { 01104 int ret = 0; 01105 #if defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) 01106 int w_ret; 01107 WCHAR szDir[MAX_PATH]; 01108 char filename[MAX_PATH]; 01109 char *p; 01110 size_t len = strlen( path ); 01111 01112 WIN32_FIND_DATAW file_data; 01113 HANDLE hFind; 01114 01115 if( len > MAX_PATH - 3 ) 01116 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 01117 01118 memset( szDir, 0, sizeof(szDir) ); 01119 memset( filename, 0, MAX_PATH ); 01120 memcpy( filename, path, len ); 01121 filename[len++] = '\\'; 01122 p = filename + len; 01123 filename[len++] = '*'; 01124 01125 w_ret = MultiByteToWideChar( CP_ACP, 0, filename, len, szDir, 01126 MAX_PATH - 3 ); 01127 if( w_ret == 0 ) 01128 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 01129 01130 hFind = FindFirstFileW( szDir, &file_data ); 01131 if( hFind == INVALID_HANDLE_VALUE ) 01132 return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); 01133 01134 len = MAX_PATH - len; 01135 do 01136 { 01137 memset( p, 0, len ); 01138 01139 if( file_data.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY ) 01140 continue; 01141 01142 w_ret = WideCharToMultiByte( CP_ACP, 0, file_data.cFileName, 01143 lstrlenW( file_data.cFileName ), 01144 p, (int) len - 1, 01145 NULL, NULL ); 01146 if( w_ret == 0 ) 01147 return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); 01148 01149 w_ret = mbedtls_x509_crt_parse_file( chain, filename ); 01150 if( w_ret < 0 ) 01151 ret++; 01152 else 01153 ret += w_ret; 01154 } 01155 while( FindNextFileW( hFind, &file_data ) != 0 ); 01156 01157 if( GetLastError() != ERROR_NO_MORE_FILES ) 01158 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; 01159 01160 FindClose( hFind ); 01161 #else /* _WIN32 */ 01162 int t_ret; 01163 struct stat sb; 01164 struct dirent *entry; 01165 char entry_name[255]; 01166 DIR *dir = opendir( path ); 01167 01168 if( dir == NULL ) 01169 return( MBEDTLS_ERR_X509_FILE_IO_ERROR ); 01170 01171 #if defined(MBEDTLS_THREADING_PTHREAD) 01172 if( ( ret = mbedtls_mutex_lock( &mbedtls_threading_readdir_mutex ) ) != 0 ) 01173 { 01174 closedir( dir ); 01175 return( ret ); 01176 } 01177 #endif 01178 01179 while( ( entry = readdir( dir ) ) != NULL ) 01180 { 01181 mbedtls_snprintf( entry_name, sizeof entry_name, "%s/%s", path, entry->d_name ); 01182 01183 if( stat( entry_name, &sb ) == -1 ) 01184 { 01185 closedir( dir ); 01186 ret = MBEDTLS_ERR_X509_FILE_IO_ERROR; 01187 goto cleanup; 01188 } 01189 01190 if( !S_ISREG( sb.st_mode ) ) 01191 continue; 01192 01193 // Ignore parse errors 01194 // 01195 t_ret = mbedtls_x509_crt_parse_file( chain, entry_name ); 01196 if( t_ret < 0 ) 01197 ret++; 01198 else 01199 ret += t_ret; 01200 } 01201 closedir( dir ); 01202 01203 cleanup: 01204 #if defined(MBEDTLS_THREADING_PTHREAD) 01205 if( mbedtls_mutex_unlock( &mbedtls_threading_readdir_mutex ) != 0 ) 01206 ret = MBEDTLS_ERR_THREADING_MUTEX_ERROR; 01207 #endif 01208 01209 #endif /* _WIN32 */ 01210 01211 return( ret ); 01212 } 01213 #endif /* MBEDTLS_FS_IO */ 01214 01215 static int x509_info_subject_alt_name( char **buf, size_t *size, 01216 const mbedtls_x509_sequence *subject_alt_name ) 01217 { 01218 size_t i; 01219 size_t n = *size; 01220 char *p = *buf; 01221 const mbedtls_x509_sequence *cur = subject_alt_name; 01222 const char *sep = ""; 01223 size_t sep_len = 0; 01224 01225 while( cur != NULL ) 01226 { 01227 if( cur->buf.len + sep_len >= n ) 01228 { 01229 *p = '\0'; 01230 return( MBEDTLS_ERR_X509_BUFFER_TOO_SMALL ); 01231 } 01232 01233 n -= cur->buf.len + sep_len; 01234 for( i = 0; i < sep_len; i++ ) 01235 *p++ = sep[i]; 01236 for( i = 0; i < cur->buf.len; i++ ) 01237 *p++ = cur->buf.p[i]; 01238 01239 sep = ", "; 01240 sep_len = 2; 01241 01242 cur = cur->next; 01243 } 01244 01245 *p = '\0'; 01246 01247 *size = n; 01248 *buf = p; 01249 01250 return( 0 ); 01251 } 01252 01253 #define PRINT_ITEM(i) \ 01254 { \ 01255 ret = mbedtls_snprintf( p, n, "%s" i, sep ); \ 01256 MBEDTLS_X509_SAFE_SNPRINTF; \ 01257 sep = ", "; \ 01258 } 01259 01260 #define CERT_TYPE(type,name) \ 01261 if( ns_cert_type & type ) \ 01262 PRINT_ITEM( name ); 01263 01264 static int x509_info_cert_type( char **buf, size_t *size, 01265 unsigned char ns_cert_type ) 01266 { 01267 int ret; 01268 size_t n = *size; 01269 char *p = *buf; 01270 const char *sep = ""; 01271 01272 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CLIENT, "SSL Client" ); 01273 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_SERVER, "SSL Server" ); 01274 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL, "Email" ); 01275 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING, "Object Signing" ); 01276 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_RESERVED, "Reserved" ); 01277 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_SSL_CA, "SSL CA" ); 01278 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_EMAIL_CA, "Email CA" ); 01279 CERT_TYPE( MBEDTLS_X509_NS_CERT_TYPE_OBJECT_SIGNING_CA, "Object Signing CA" ); 01280 01281 *size = n; 01282 *buf = p; 01283 01284 return( 0 ); 01285 } 01286 01287 #define KEY_USAGE(code,name) \ 01288 if( key_usage & code ) \ 01289 PRINT_ITEM( name ); 01290 01291 static int x509_info_key_usage( char **buf, size_t *size, 01292 unsigned int key_usage ) 01293 { 01294 int ret; 01295 size_t n = *size; 01296 char *p = *buf; 01297 const char *sep = ""; 01298 01299 KEY_USAGE( MBEDTLS_X509_KU_DIGITAL_SIGNATURE, "Digital Signature" ); 01300 KEY_USAGE( MBEDTLS_X509_KU_NON_REPUDIATION, "Non Repudiation" ); 01301 KEY_USAGE( MBEDTLS_X509_KU_KEY_ENCIPHERMENT, "Key Encipherment" ); 01302 KEY_USAGE( MBEDTLS_X509_KU_DATA_ENCIPHERMENT, "Data Encipherment" ); 01303 KEY_USAGE( MBEDTLS_X509_KU_KEY_AGREEMENT, "Key Agreement" ); 01304 KEY_USAGE( MBEDTLS_X509_KU_KEY_CERT_SIGN, "Key Cert Sign" ); 01305 KEY_USAGE( MBEDTLS_X509_KU_CRL_SIGN, "CRL Sign" ); 01306 KEY_USAGE( MBEDTLS_X509_KU_ENCIPHER_ONLY, "Encipher Only" ); 01307 KEY_USAGE( MBEDTLS_X509_KU_DECIPHER_ONLY, "Decipher Only" ); 01308 01309 *size = n; 01310 *buf = p; 01311 01312 return( 0 ); 01313 } 01314 01315 static int x509_info_ext_key_usage( char **buf, size_t *size, 01316 const mbedtls_x509_sequence *extended_key_usage ) 01317 { 01318 int ret; 01319 const char *desc; 01320 size_t n = *size; 01321 char *p = *buf; 01322 const mbedtls_x509_sequence *cur = extended_key_usage; 01323 const char *sep = ""; 01324 01325 while( cur != NULL ) 01326 { 01327 if( mbedtls_oid_get_extended_key_usage( &cur->buf, &desc ) != 0 ) 01328 desc = "???"; 01329 01330 ret = mbedtls_snprintf( p, n, "%s%s", sep, desc ); 01331 MBEDTLS_X509_SAFE_SNPRINTF; 01332 01333 sep = ", "; 01334 01335 cur = cur->next; 01336 } 01337 01338 *size = n; 01339 *buf = p; 01340 01341 return( 0 ); 01342 } 01343 01344 /* 01345 * Return an informational string about the certificate. 01346 */ 01347 #define BEFORE_COLON 18 01348 #define BC "18" 01349 int mbedtls_x509_crt_info( char *buf, size_t size, const char *prefix, 01350 const mbedtls_x509_crt *crt ) 01351 { 01352 int ret; 01353 size_t n; 01354 char *p; 01355 char key_size_str[BEFORE_COLON]; 01356 01357 p = buf; 01358 n = size; 01359 01360 if( NULL == crt ) 01361 { 01362 ret = mbedtls_snprintf( p, n, "\nCertificate is uninitialised!\n" ); 01363 MBEDTLS_X509_SAFE_SNPRINTF; 01364 01365 return( (int) ( size - n ) ); 01366 } 01367 01368 ret = mbedtls_snprintf( p, n, "%scert. version : %d\n", 01369 prefix, crt->version ); 01370 MBEDTLS_X509_SAFE_SNPRINTF; 01371 ret = mbedtls_snprintf( p, n, "%sserial number : ", 01372 prefix ); 01373 MBEDTLS_X509_SAFE_SNPRINTF; 01374 01375 ret = mbedtls_x509_serial_gets( p, n, &crt->serial ); 01376 MBEDTLS_X509_SAFE_SNPRINTF; 01377 01378 ret = mbedtls_snprintf( p, n, "\n%sissuer name : ", prefix ); 01379 MBEDTLS_X509_SAFE_SNPRINTF; 01380 ret = mbedtls_x509_dn_gets( p, n, &crt->issuer ); 01381 MBEDTLS_X509_SAFE_SNPRINTF; 01382 01383 ret = mbedtls_snprintf( p, n, "\n%ssubject name : ", prefix ); 01384 MBEDTLS_X509_SAFE_SNPRINTF; 01385 ret = mbedtls_x509_dn_gets( p, n, &crt->subject ); 01386 MBEDTLS_X509_SAFE_SNPRINTF; 01387 01388 ret = mbedtls_snprintf( p, n, "\n%sissued on : " \ 01389 "%04d-%02d-%02d %02d:%02d:%02d", prefix, 01390 crt->valid_from.year, crt->valid_from.mon, 01391 crt->valid_from.day, crt->valid_from.hour, 01392 crt->valid_from.min, crt->valid_from.sec ); 01393 MBEDTLS_X509_SAFE_SNPRINTF; 01394 01395 ret = mbedtls_snprintf( p, n, "\n%sexpires on : " \ 01396 "%04d-%02d-%02d %02d:%02d:%02d", prefix, 01397 crt->valid_to.year, crt->valid_to.mon, 01398 crt->valid_to.day, crt->valid_to.hour, 01399 crt->valid_to.min, crt->valid_to.sec ); 01400 MBEDTLS_X509_SAFE_SNPRINTF; 01401 01402 ret = mbedtls_snprintf( p, n, "\n%ssigned using : ", prefix ); 01403 MBEDTLS_X509_SAFE_SNPRINTF; 01404 01405 ret = mbedtls_x509_sig_alg_gets( p, n, &crt->sig_oid, crt->sig_pk, 01406 crt->sig_md, crt->sig_opts ); 01407 MBEDTLS_X509_SAFE_SNPRINTF; 01408 01409 /* Key size */ 01410 if( ( ret = mbedtls_x509_key_size_helper( key_size_str, BEFORE_COLON, 01411 mbedtls_pk_get_name( &crt->pk ) ) ) != 0 ) 01412 { 01413 return( ret ); 01414 } 01415 01416 ret = mbedtls_snprintf( p, n, "\n%s%-" BC "s: %d bits", prefix, key_size_str, 01417 (int) mbedtls_pk_get_bitlen( &crt->pk ) ); 01418 MBEDTLS_X509_SAFE_SNPRINTF; 01419 01420 /* 01421 * Optional extensions 01422 */ 01423 01424 if( crt->ext_types & MBEDTLS_X509_EXT_BASIC_CONSTRAINTS ) 01425 { 01426 ret = mbedtls_snprintf( p, n, "\n%sbasic constraints : CA=%s", prefix, 01427 crt->ca_istrue ? "true" : "false" ); 01428 MBEDTLS_X509_SAFE_SNPRINTF; 01429 01430 if( crt->max_pathlen > 0 ) 01431 { 01432 ret = mbedtls_snprintf( p, n, ", max_pathlen=%d", crt->max_pathlen - 1 ); 01433 MBEDTLS_X509_SAFE_SNPRINTF; 01434 } 01435 } 01436 01437 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) 01438 { 01439 ret = mbedtls_snprintf( p, n, "\n%ssubject alt name : ", prefix ); 01440 MBEDTLS_X509_SAFE_SNPRINTF; 01441 01442 if( ( ret = x509_info_subject_alt_name( &p, &n, 01443 &crt->subject_alt_names ) ) != 0 ) 01444 return( ret ); 01445 } 01446 01447 if( crt->ext_types & MBEDTLS_X509_EXT_NS_CERT_TYPE ) 01448 { 01449 ret = mbedtls_snprintf( p, n, "\n%scert. type : ", prefix ); 01450 MBEDTLS_X509_SAFE_SNPRINTF; 01451 01452 if( ( ret = x509_info_cert_type( &p, &n, crt->ns_cert_type ) ) != 0 ) 01453 return( ret ); 01454 } 01455 01456 if( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) 01457 { 01458 ret = mbedtls_snprintf( p, n, "\n%skey usage : ", prefix ); 01459 MBEDTLS_X509_SAFE_SNPRINTF; 01460 01461 if( ( ret = x509_info_key_usage( &p, &n, crt->key_usage ) ) != 0 ) 01462 return( ret ); 01463 } 01464 01465 if( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) 01466 { 01467 ret = mbedtls_snprintf( p, n, "\n%sext key usage : ", prefix ); 01468 MBEDTLS_X509_SAFE_SNPRINTF; 01469 01470 if( ( ret = x509_info_ext_key_usage( &p, &n, 01471 &crt->ext_key_usage ) ) != 0 ) 01472 return( ret ); 01473 } 01474 01475 ret = mbedtls_snprintf( p, n, "\n" ); 01476 MBEDTLS_X509_SAFE_SNPRINTF; 01477 01478 return( (int) ( size - n ) ); 01479 } 01480 01481 struct x509_crt_verify_string { 01482 int code; 01483 const char *string; 01484 }; 01485 01486 static const struct x509_crt_verify_string x509_crt_verify_strings[] = { 01487 { MBEDTLS_X509_BADCERT_EXPIRED, "The certificate validity has expired" }, 01488 { MBEDTLS_X509_BADCERT_REVOKED, "The certificate has been revoked (is on a CRL)" }, 01489 { MBEDTLS_X509_BADCERT_CN_MISMATCH, "The certificate Common Name (CN) does not match with the expected CN" }, 01490 { MBEDTLS_X509_BADCERT_NOT_TRUSTED, "The certificate is not correctly signed by the trusted CA" }, 01491 { MBEDTLS_X509_BADCRL_NOT_TRUSTED, "The CRL is not correctly signed by the trusted CA" }, 01492 { MBEDTLS_X509_BADCRL_EXPIRED, "The CRL is expired" }, 01493 { MBEDTLS_X509_BADCERT_MISSING, "Certificate was missing" }, 01494 { MBEDTLS_X509_BADCERT_SKIP_VERIFY, "Certificate verification was skipped" }, 01495 { MBEDTLS_X509_BADCERT_OTHER, "Other reason (can be used by verify callback)" }, 01496 { MBEDTLS_X509_BADCERT_FUTURE, "The certificate validity starts in the future" }, 01497 { MBEDTLS_X509_BADCRL_FUTURE, "The CRL is from the future" }, 01498 { MBEDTLS_X509_BADCERT_KEY_USAGE, "Usage does not match the keyUsage extension" }, 01499 { MBEDTLS_X509_BADCERT_EXT_KEY_USAGE, "Usage does not match the extendedKeyUsage extension" }, 01500 { MBEDTLS_X509_BADCERT_NS_CERT_TYPE, "Usage does not match the nsCertType extension" }, 01501 { MBEDTLS_X509_BADCERT_BAD_MD, "The certificate is signed with an unacceptable hash." }, 01502 { MBEDTLS_X509_BADCERT_BAD_PK, "The certificate is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, 01503 { MBEDTLS_X509_BADCERT_BAD_KEY, "The certificate is signed with an unacceptable key (eg bad curve, RSA too short)." }, 01504 { MBEDTLS_X509_BADCRL_BAD_MD, "The CRL is signed with an unacceptable hash." }, 01505 { MBEDTLS_X509_BADCRL_BAD_PK, "The CRL is signed with an unacceptable PK alg (eg RSA vs ECDSA)." }, 01506 { MBEDTLS_X509_BADCRL_BAD_KEY, "The CRL is signed with an unacceptable key (eg bad curve, RSA too short)." }, 01507 { 0, NULL } 01508 }; 01509 01510 int mbedtls_x509_crt_verify_info( char *buf, size_t size, const char *prefix, 01511 uint32_t flags ) 01512 { 01513 int ret; 01514 const struct x509_crt_verify_string *cur; 01515 char *p = buf; 01516 size_t n = size; 01517 01518 for( cur = x509_crt_verify_strings; cur->string != NULL ; cur++ ) 01519 { 01520 if( ( flags & cur->code ) == 0 ) 01521 continue; 01522 01523 ret = mbedtls_snprintf( p, n, "%s%s\n", prefix, cur->string ); 01524 MBEDTLS_X509_SAFE_SNPRINTF; 01525 flags ^= cur->code; 01526 } 01527 01528 if( flags != 0 ) 01529 { 01530 ret = mbedtls_snprintf( p, n, "%sUnknown reason " 01531 "(this should not happen)\n", prefix ); 01532 MBEDTLS_X509_SAFE_SNPRINTF; 01533 } 01534 01535 return( (int) ( size - n ) ); 01536 } 01537 01538 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) 01539 int mbedtls_x509_crt_check_key_usage( const mbedtls_x509_crt *crt, 01540 unsigned int usage ) 01541 { 01542 unsigned int usage_must, usage_may; 01543 unsigned int may_mask = MBEDTLS_X509_KU_ENCIPHER_ONLY 01544 | MBEDTLS_X509_KU_DECIPHER_ONLY; 01545 01546 if( ( crt->ext_types & MBEDTLS_X509_EXT_KEY_USAGE ) == 0 ) 01547 return( 0 ); 01548 01549 usage_must = usage & ~may_mask; 01550 01551 if( ( ( crt->key_usage & ~may_mask ) & usage_must ) != usage_must ) 01552 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 01553 01554 usage_may = usage & may_mask; 01555 01556 if( ( ( crt->key_usage & may_mask ) | usage_may ) != usage_may ) 01557 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 01558 01559 return( 0 ); 01560 } 01561 #endif 01562 01563 #if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE) 01564 int mbedtls_x509_crt_check_extended_key_usage( const mbedtls_x509_crt *crt, 01565 const char *usage_oid, 01566 size_t usage_len ) 01567 { 01568 const mbedtls_x509_sequence *cur; 01569 01570 /* Extension is not mandatory, absent means no restriction */ 01571 if( ( crt->ext_types & MBEDTLS_X509_EXT_EXTENDED_KEY_USAGE ) == 0 ) 01572 return( 0 ); 01573 01574 /* 01575 * Look for the requested usage (or wildcard ANY) in our list 01576 */ 01577 for( cur = &crt->ext_key_usage; cur != NULL; cur = cur->next ) 01578 { 01579 const mbedtls_x509_buf *cur_oid = &cur->buf; 01580 01581 if( cur_oid->len == usage_len && 01582 memcmp( cur_oid->p, usage_oid, usage_len ) == 0 ) 01583 { 01584 return( 0 ); 01585 } 01586 01587 if( MBEDTLS_OID_CMP( MBEDTLS_OID_ANY_EXTENDED_KEY_USAGE, cur_oid ) == 0 ) 01588 return( 0 ); 01589 } 01590 01591 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 01592 } 01593 #endif /* MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE */ 01594 01595 #if defined(MBEDTLS_X509_CRL_PARSE_C) 01596 /* 01597 * Return 1 if the certificate is revoked, or 0 otherwise. 01598 */ 01599 int mbedtls_x509_crt_is_revoked( const mbedtls_x509_crt *crt, const mbedtls_x509_crl *crl ) 01600 { 01601 const mbedtls_x509_crl_entry *cur = &crl->entry; 01602 01603 while( cur != NULL && cur->serial.len != 0 ) 01604 { 01605 if( crt->serial.len == cur->serial.len && 01606 memcmp( crt->serial.p, cur->serial.p, crt->serial.len ) == 0 ) 01607 { 01608 if( mbedtls_x509_time_is_past( &cur->revocation_date ) ) 01609 return( 1 ); 01610 } 01611 01612 cur = cur->next; 01613 } 01614 01615 return( 0 ); 01616 } 01617 01618 /* 01619 * Check that the given certificate is not revoked according to the CRL. 01620 * Skip validation is no CRL for the given CA is present. 01621 */ 01622 static int x509_crt_verifycrl( mbedtls_x509_crt *crt, mbedtls_x509_crt *ca, 01623 mbedtls_x509_crl *crl_list, 01624 const mbedtls_x509_crt_profile *profile ) 01625 { 01626 int flags = 0; 01627 unsigned char hash[MBEDTLS_MD_MAX_SIZE]; 01628 const mbedtls_md_info_t *md_info; 01629 01630 if( ca == NULL ) 01631 return( flags ); 01632 01633 while( crl_list != NULL ) 01634 { 01635 if( crl_list->version == 0 || 01636 crl_list->issuer_raw.len != ca->subject_raw.len || 01637 memcmp( crl_list->issuer_raw.p, ca->subject_raw.p, 01638 crl_list->issuer_raw.len ) != 0 ) 01639 { 01640 crl_list = crl_list->next; 01641 continue; 01642 } 01643 01644 /* 01645 * Check if the CA is configured to sign CRLs 01646 */ 01647 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) 01648 if( mbedtls_x509_crt_check_key_usage( ca, MBEDTLS_X509_KU_CRL_SIGN ) != 0 ) 01649 { 01650 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; 01651 break; 01652 } 01653 #endif 01654 01655 /* 01656 * Check if CRL is correctly signed by the trusted CA 01657 */ 01658 if( x509_profile_check_md_alg( profile, crl_list->sig_md ) != 0 ) 01659 flags |= MBEDTLS_X509_BADCRL_BAD_MD; 01660 01661 if( x509_profile_check_pk_alg( profile, crl_list->sig_pk ) != 0 ) 01662 flags |= MBEDTLS_X509_BADCRL_BAD_PK; 01663 01664 md_info = mbedtls_md_info_from_type( crl_list->sig_md ); 01665 if( md_info == NULL ) 01666 { 01667 /* 01668 * Cannot check 'unknown' hash 01669 */ 01670 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; 01671 break; 01672 } 01673 01674 mbedtls_md( md_info, crl_list->tbs.p, crl_list->tbs.len, hash ); 01675 01676 if( x509_profile_check_key( profile, crl_list->sig_pk, &ca->pk ) != 0 ) 01677 flags |= MBEDTLS_X509_BADCERT_BAD_KEY; 01678 01679 if( mbedtls_pk_verify_ext( crl_list->sig_pk, crl_list->sig_opts, &ca->pk, 01680 crl_list->sig_md, hash, mbedtls_md_get_size( md_info ), 01681 crl_list->sig.p, crl_list->sig.len ) != 0 ) 01682 { 01683 flags |= MBEDTLS_X509_BADCRL_NOT_TRUSTED; 01684 break; 01685 } 01686 01687 /* 01688 * Check for validity of CRL (Do not drop out) 01689 */ 01690 if( mbedtls_x509_time_is_past( &crl_list->next_update ) ) 01691 flags |= MBEDTLS_X509_BADCRL_EXPIRED; 01692 01693 if( mbedtls_x509_time_is_future( &crl_list->this_update ) ) 01694 flags |= MBEDTLS_X509_BADCRL_FUTURE; 01695 01696 /* 01697 * Check if certificate is revoked 01698 */ 01699 if( mbedtls_x509_crt_is_revoked( crt, crl_list ) ) 01700 { 01701 flags |= MBEDTLS_X509_BADCERT_REVOKED; 01702 break; 01703 } 01704 01705 crl_list = crl_list->next; 01706 } 01707 01708 return( flags ); 01709 } 01710 #endif /* MBEDTLS_X509_CRL_PARSE_C */ 01711 01712 /* 01713 * Like memcmp, but case-insensitive and always returns -1 if different 01714 */ 01715 static int x509_memcasecmp( const void *s1, const void *s2, size_t len ) 01716 { 01717 size_t i; 01718 unsigned char diff; 01719 const unsigned char *n1 = s1, *n2 = s2; 01720 01721 for( i = 0; i < len; i++ ) 01722 { 01723 diff = n1[i] ^ n2[i]; 01724 01725 if( diff == 0 ) 01726 continue; 01727 01728 if( diff == 32 && 01729 ( ( n1[i] >= 'a' && n1[i] <= 'z' ) || 01730 ( n1[i] >= 'A' && n1[i] <= 'Z' ) ) ) 01731 { 01732 continue; 01733 } 01734 01735 return( -1 ); 01736 } 01737 01738 return( 0 ); 01739 } 01740 01741 /* 01742 * Return 0 if name matches wildcard, -1 otherwise 01743 */ 01744 static int x509_check_wildcard( const char *cn, mbedtls_x509_buf *name ) 01745 { 01746 size_t i; 01747 size_t cn_idx = 0, cn_len = strlen( cn ); 01748 01749 if( name->len < 3 || name->p[0] != '*' || name->p[1] != '.' ) 01750 return( 0 ); 01751 01752 for( i = 0; i < cn_len; ++i ) 01753 { 01754 if( cn[i] == '.' ) 01755 { 01756 cn_idx = i; 01757 break; 01758 } 01759 } 01760 01761 if( cn_idx == 0 ) 01762 return( -1 ); 01763 01764 if( cn_len - cn_idx == name->len - 1 && 01765 x509_memcasecmp( name->p + 1, cn + cn_idx, name->len - 1 ) == 0 ) 01766 { 01767 return( 0 ); 01768 } 01769 01770 return( -1 ); 01771 } 01772 01773 /* 01774 * Compare two X.509 strings, case-insensitive, and allowing for some encoding 01775 * variations (but not all). 01776 * 01777 * Return 0 if equal, -1 otherwise. 01778 */ 01779 static int x509_string_cmp( const mbedtls_x509_buf *a, const mbedtls_x509_buf *b ) 01780 { 01781 if( a->tag == b->tag && 01782 a->len == b->len && 01783 memcmp( a->p, b->p, b->len ) == 0 ) 01784 { 01785 return( 0 ); 01786 } 01787 01788 if( ( a->tag == MBEDTLS_ASN1_UTF8_STRING || a->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && 01789 ( b->tag == MBEDTLS_ASN1_UTF8_STRING || b->tag == MBEDTLS_ASN1_PRINTABLE_STRING ) && 01790 a->len == b->len && 01791 x509_memcasecmp( a->p, b->p, b->len ) == 0 ) 01792 { 01793 return( 0 ); 01794 } 01795 01796 return( -1 ); 01797 } 01798 01799 /* 01800 * Compare two X.509 Names (aka rdnSequence). 01801 * 01802 * See RFC 5280 section 7.1, though we don't implement the whole algorithm: 01803 * we sometimes return unequal when the full algorithm would return equal, 01804 * but never the other way. (In particular, we don't do Unicode normalisation 01805 * or space folding.) 01806 * 01807 * Return 0 if equal, -1 otherwise. 01808 */ 01809 static int x509_name_cmp( const mbedtls_x509_name *a, const mbedtls_x509_name *b ) 01810 { 01811 /* Avoid recursion, it might not be optimised by the compiler */ 01812 while( a != NULL || b != NULL ) 01813 { 01814 if( a == NULL || b == NULL ) 01815 return( -1 ); 01816 01817 /* type */ 01818 if( a->oid.tag != b->oid.tag || 01819 a->oid.len != b->oid.len || 01820 memcmp( a->oid.p, b->oid.p, b->oid.len ) != 0 ) 01821 { 01822 return( -1 ); 01823 } 01824 01825 /* value */ 01826 if( x509_string_cmp( &a->val, &b->val ) != 0 ) 01827 return( -1 ); 01828 01829 /* structure of the list of sets */ 01830 if( a->next_merged != b->next_merged ) 01831 return( -1 ); 01832 01833 a = a->next; 01834 b = b->next; 01835 } 01836 01837 /* a == NULL == b */ 01838 return( 0 ); 01839 } 01840 01841 /* 01842 * Check if 'parent' is a suitable parent (signing CA) for 'child'. 01843 * Return 0 if yes, -1 if not. 01844 * 01845 * top means parent is a locally-trusted certificate 01846 * bottom means child is the end entity cert 01847 */ 01848 static int x509_crt_check_parent( const mbedtls_x509_crt *child, 01849 const mbedtls_x509_crt *parent, 01850 int top, int bottom ) 01851 { 01852 int need_ca_bit; 01853 01854 /* Parent must be the issuer */ 01855 if( x509_name_cmp( &child->issuer, &parent->subject ) != 0 ) 01856 return( -1 ); 01857 01858 /* Parent must have the basicConstraints CA bit set as a general rule */ 01859 need_ca_bit = 1; 01860 01861 /* Exception: v1/v2 certificates that are locally trusted. */ 01862 if( top && parent->version < 3 ) 01863 need_ca_bit = 0; 01864 01865 /* Exception: self-signed end-entity certs that are locally trusted. */ 01866 if( top && bottom && 01867 child->raw.len == parent->raw.len && 01868 memcmp( child->raw.p, parent->raw.p, child->raw.len ) == 0 ) 01869 { 01870 need_ca_bit = 0; 01871 } 01872 01873 if( need_ca_bit && ! parent->ca_istrue ) 01874 return( -1 ); 01875 01876 #if defined(MBEDTLS_X509_CHECK_KEY_USAGE) 01877 if( need_ca_bit && 01878 mbedtls_x509_crt_check_key_usage( parent, MBEDTLS_X509_KU_KEY_CERT_SIGN ) != 0 ) 01879 { 01880 return( -1 ); 01881 } 01882 #endif 01883 01884 return( 0 ); 01885 } 01886 01887 static int x509_crt_verify_top( 01888 mbedtls_x509_crt *child, mbedtls_x509_crt *trust_ca, 01889 mbedtls_x509_crl *ca_crl, 01890 const mbedtls_x509_crt_profile *profile, 01891 int path_cnt, int self_cnt, uint32_t *flags, 01892 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 01893 void *p_vrfy ) 01894 { 01895 int ret; 01896 uint32_t ca_flags = 0; 01897 int check_path_cnt; 01898 unsigned char hash[MBEDTLS_MD_MAX_SIZE]; 01899 const mbedtls_md_info_t *md_info; 01900 01901 if( mbedtls_x509_time_is_past( &child->valid_to ) ) 01902 *flags |= MBEDTLS_X509_BADCERT_EXPIRED; 01903 01904 if( mbedtls_x509_time_is_future( &child->valid_from ) ) 01905 *flags |= MBEDTLS_X509_BADCERT_FUTURE; 01906 01907 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 ) 01908 *flags |= MBEDTLS_X509_BADCERT_BAD_MD; 01909 01910 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 ) 01911 *flags |= MBEDTLS_X509_BADCERT_BAD_PK; 01912 01913 /* 01914 * Child is the top of the chain. Check against the trust_ca list. 01915 */ 01916 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; 01917 01918 md_info = mbedtls_md_info_from_type( child->sig_md ); 01919 if( md_info == NULL ) 01920 { 01921 /* 01922 * Cannot check 'unknown', no need to try any CA 01923 */ 01924 trust_ca = NULL; 01925 } 01926 else 01927 mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ); 01928 01929 for( /* trust_ca */ ; trust_ca != NULL; trust_ca = trust_ca->next ) 01930 { 01931 if( x509_crt_check_parent( child, trust_ca, 1, path_cnt == 0 ) != 0 ) 01932 continue; 01933 01934 check_path_cnt = path_cnt + 1; 01935 01936 /* 01937 * Reduce check_path_cnt to check against if top of the chain is 01938 * the same as the trusted CA 01939 */ 01940 if( child->subject_raw.len == trust_ca->subject_raw.len && 01941 memcmp( child->subject_raw.p, trust_ca->subject_raw.p, 01942 child->issuer_raw.len ) == 0 ) 01943 { 01944 check_path_cnt--; 01945 } 01946 01947 /* Self signed certificates do not count towards the limit */ 01948 if( trust_ca->max_pathlen > 0 && 01949 trust_ca->max_pathlen < check_path_cnt - self_cnt ) 01950 { 01951 continue; 01952 } 01953 01954 if( mbedtls_x509_time_is_past( &trust_ca->valid_to ) ) 01955 { 01956 continue; 01957 } 01958 01959 if( mbedtls_x509_time_is_future( &trust_ca->valid_from ) ) 01960 { 01961 continue; 01962 } 01963 01964 if( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &trust_ca->pk, 01965 child->sig_md, hash, mbedtls_md_get_size( md_info ), 01966 child->sig.p, child->sig.len ) != 0 ) 01967 { 01968 continue; 01969 } 01970 01971 /* 01972 * Top of chain is signed by a trusted CA 01973 */ 01974 *flags &= ~MBEDTLS_X509_BADCERT_NOT_TRUSTED; 01975 01976 if( x509_profile_check_key( profile, child->sig_pk, &trust_ca->pk ) != 0 ) 01977 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; 01978 01979 break; 01980 } 01981 01982 /* 01983 * If top of chain is not the same as the trusted CA send a verify request 01984 * to the callback for any issues with validity and CRL presence for the 01985 * trusted CA certificate. 01986 */ 01987 if( trust_ca != NULL && 01988 ( child->subject_raw.len != trust_ca->subject_raw.len || 01989 memcmp( child->subject_raw.p, trust_ca->subject_raw.p, 01990 child->issuer_raw.len ) != 0 ) ) 01991 { 01992 #if defined(MBEDTLS_X509_CRL_PARSE_C) 01993 /* Check trusted CA's CRL for the chain's top crt */ 01994 *flags |= x509_crt_verifycrl( child, trust_ca, ca_crl, profile ); 01995 #else 01996 ((void) ca_crl); 01997 #endif 01998 01999 if( NULL != f_vrfy ) 02000 { 02001 if( ( ret = f_vrfy( p_vrfy, trust_ca, path_cnt + 1, 02002 &ca_flags ) ) != 0 ) 02003 { 02004 return( ret ); 02005 } 02006 } 02007 } 02008 02009 /* Call callback on top cert */ 02010 if( NULL != f_vrfy ) 02011 { 02012 if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 ) 02013 return( ret ); 02014 } 02015 02016 *flags |= ca_flags; 02017 02018 return( 0 ); 02019 } 02020 02021 static int x509_crt_verify_child( 02022 mbedtls_x509_crt *child, mbedtls_x509_crt *parent, 02023 mbedtls_x509_crt *trust_ca, mbedtls_x509_crl *ca_crl, 02024 const mbedtls_x509_crt_profile *profile, 02025 int path_cnt, int self_cnt, uint32_t *flags, 02026 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 02027 void *p_vrfy ) 02028 { 02029 int ret; 02030 uint32_t parent_flags = 0; 02031 unsigned char hash[MBEDTLS_MD_MAX_SIZE]; 02032 mbedtls_x509_crt *grandparent; 02033 const mbedtls_md_info_t *md_info; 02034 02035 /* Counting intermediate self signed certificates */ 02036 if( ( path_cnt != 0 ) && x509_name_cmp( &child->issuer, &child->subject ) == 0 ) 02037 self_cnt++; 02038 02039 /* path_cnt is 0 for the first intermediate CA */ 02040 if( 1 + path_cnt > MBEDTLS_X509_MAX_INTERMEDIATE_CA ) 02041 { 02042 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; 02043 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ); 02044 } 02045 02046 if( mbedtls_x509_time_is_past( &child->valid_to ) ) 02047 *flags |= MBEDTLS_X509_BADCERT_EXPIRED; 02048 02049 if( mbedtls_x509_time_is_future( &child->valid_from ) ) 02050 *flags |= MBEDTLS_X509_BADCERT_FUTURE; 02051 02052 if( x509_profile_check_md_alg( profile, child->sig_md ) != 0 ) 02053 *flags |= MBEDTLS_X509_BADCERT_BAD_MD; 02054 02055 if( x509_profile_check_pk_alg( profile, child->sig_pk ) != 0 ) 02056 *flags |= MBEDTLS_X509_BADCERT_BAD_PK; 02057 02058 md_info = mbedtls_md_info_from_type( child->sig_md ); 02059 if( md_info == NULL ) 02060 { 02061 /* 02062 * Cannot check 'unknown' hash 02063 */ 02064 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; 02065 } 02066 else 02067 { 02068 mbedtls_md( md_info, child->tbs.p, child->tbs.len, hash ); 02069 02070 if( x509_profile_check_key( profile, child->sig_pk, &parent->pk ) != 0 ) 02071 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; 02072 02073 if( mbedtls_pk_verify_ext( child->sig_pk, child->sig_opts, &parent->pk, 02074 child->sig_md, hash, mbedtls_md_get_size( md_info ), 02075 child->sig.p, child->sig.len ) != 0 ) 02076 { 02077 *flags |= MBEDTLS_X509_BADCERT_NOT_TRUSTED; 02078 } 02079 } 02080 02081 #if defined(MBEDTLS_X509_CRL_PARSE_C) 02082 /* Check trusted CA's CRL for the given crt */ 02083 *flags |= x509_crt_verifycrl(child, parent, ca_crl, profile ); 02084 #endif 02085 02086 /* Look for a grandparent in trusted CAs */ 02087 for( grandparent = trust_ca; 02088 grandparent != NULL; 02089 grandparent = grandparent->next ) 02090 { 02091 if( x509_crt_check_parent( parent, grandparent, 02092 0, path_cnt == 0 ) == 0 ) 02093 break; 02094 } 02095 02096 if( grandparent != NULL ) 02097 { 02098 ret = x509_crt_verify_top( parent, grandparent, ca_crl, profile, 02099 path_cnt + 1, self_cnt, &parent_flags, f_vrfy, p_vrfy ); 02100 if( ret != 0 ) 02101 return( ret ); 02102 } 02103 else 02104 { 02105 /* Look for a grandparent upwards the chain */ 02106 for( grandparent = parent->next; 02107 grandparent != NULL; 02108 grandparent = grandparent->next ) 02109 { 02110 /* +2 because the current step is not yet accounted for 02111 * and because max_pathlen is one higher than it should be. 02112 * Also self signed certificates do not count to the limit. */ 02113 if( grandparent->max_pathlen > 0 && 02114 grandparent->max_pathlen < 2 + path_cnt - self_cnt ) 02115 { 02116 continue; 02117 } 02118 02119 if( x509_crt_check_parent( parent, grandparent, 02120 0, path_cnt == 0 ) == 0 ) 02121 break; 02122 } 02123 02124 /* Is our parent part of the chain or at the top? */ 02125 if( grandparent != NULL ) 02126 { 02127 ret = x509_crt_verify_child( parent, grandparent, trust_ca, ca_crl, 02128 profile, path_cnt + 1, self_cnt, &parent_flags, 02129 f_vrfy, p_vrfy ); 02130 if( ret != 0 ) 02131 return( ret ); 02132 } 02133 else 02134 { 02135 ret = x509_crt_verify_top( parent, trust_ca, ca_crl, profile, 02136 path_cnt + 1, self_cnt, &parent_flags, 02137 f_vrfy, p_vrfy ); 02138 if( ret != 0 ) 02139 return( ret ); 02140 } 02141 } 02142 02143 /* child is verified to be a child of the parent, call verify callback */ 02144 if( NULL != f_vrfy ) 02145 if( ( ret = f_vrfy( p_vrfy, child, path_cnt, flags ) ) != 0 ) 02146 return( ret ); 02147 02148 *flags |= parent_flags; 02149 02150 return( 0 ); 02151 } 02152 02153 /* 02154 * Verify the certificate validity 02155 */ 02156 int mbedtls_x509_crt_verify( mbedtls_x509_crt *crt, 02157 mbedtls_x509_crt *trust_ca, 02158 mbedtls_x509_crl *ca_crl, 02159 const char *cn, uint32_t *flags, 02160 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 02161 void *p_vrfy ) 02162 { 02163 return( mbedtls_x509_crt_verify_with_profile( crt, trust_ca, ca_crl, 02164 &mbedtls_x509_crt_profile_default, cn, flags, f_vrfy, p_vrfy ) ); 02165 } 02166 02167 02168 /* 02169 * Verify the certificate validity, with profile 02170 */ 02171 int mbedtls_x509_crt_verify_with_profile( mbedtls_x509_crt *crt, 02172 mbedtls_x509_crt *trust_ca, 02173 mbedtls_x509_crl *ca_crl, 02174 const mbedtls_x509_crt_profile *profile, 02175 const char *cn, uint32_t *flags, 02176 int (*f_vrfy)(void *, mbedtls_x509_crt *, int, uint32_t *), 02177 void *p_vrfy ) 02178 { 02179 size_t cn_len; 02180 int ret; 02181 int pathlen = 0, selfsigned = 0; 02182 mbedtls_x509_crt *parent; 02183 mbedtls_x509_name *name; 02184 mbedtls_x509_sequence *cur = NULL; 02185 mbedtls_pk_type_t pk_type; 02186 02187 if( profile == NULL ) 02188 return( MBEDTLS_ERR_X509_BAD_INPUT_DATA ); 02189 02190 *flags = 0; 02191 02192 if( cn != NULL ) 02193 { 02194 name = &crt->subject; 02195 cn_len = strlen( cn ); 02196 02197 if( crt->ext_types & MBEDTLS_X509_EXT_SUBJECT_ALT_NAME ) 02198 { 02199 cur = &crt->subject_alt_names; 02200 02201 while( cur != NULL ) 02202 { 02203 if( cur->buf.len == cn_len && 02204 x509_memcasecmp( cn, cur->buf.p, cn_len ) == 0 ) 02205 break; 02206 02207 if( cur->buf.len > 2 && 02208 memcmp( cur->buf.p, "*.", 2 ) == 0 && 02209 x509_check_wildcard( cn, &cur->buf ) == 0 ) 02210 { 02211 break; 02212 } 02213 02214 cur = cur->next; 02215 } 02216 02217 if( cur == NULL ) 02218 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; 02219 } 02220 else 02221 { 02222 while( name != NULL ) 02223 { 02224 if( MBEDTLS_OID_CMP( MBEDTLS_OID_AT_CN, &name->oid ) == 0 ) 02225 { 02226 if( name->val.len == cn_len && 02227 x509_memcasecmp( name->val.p, cn, cn_len ) == 0 ) 02228 break; 02229 02230 if( name->val.len > 2 && 02231 memcmp( name->val.p, "*.", 2 ) == 0 && 02232 x509_check_wildcard( cn, &name->val ) == 0 ) 02233 break; 02234 } 02235 02236 name = name->next; 02237 } 02238 02239 if( name == NULL ) 02240 *flags |= MBEDTLS_X509_BADCERT_CN_MISMATCH; 02241 } 02242 } 02243 02244 /* Check the type and size of the key */ 02245 pk_type = mbedtls_pk_get_type( &crt->pk ); 02246 02247 if( x509_profile_check_pk_alg( profile, pk_type ) != 0 ) 02248 *flags |= MBEDTLS_X509_BADCERT_BAD_PK; 02249 02250 if( x509_profile_check_key( profile, pk_type, &crt->pk ) != 0 ) 02251 *flags |= MBEDTLS_X509_BADCERT_BAD_KEY; 02252 02253 /* Look for a parent in trusted CAs */ 02254 for( parent = trust_ca; parent != NULL; parent = parent->next ) 02255 { 02256 if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 ) 02257 break; 02258 } 02259 02260 if( parent != NULL ) 02261 { 02262 ret = x509_crt_verify_top( crt, parent, ca_crl, profile, 02263 pathlen, selfsigned, flags, f_vrfy, p_vrfy ); 02264 if( ret != 0 ) 02265 return( ret ); 02266 } 02267 else 02268 { 02269 /* Look for a parent upwards the chain */ 02270 for( parent = crt->next; parent != NULL; parent = parent->next ) 02271 if( x509_crt_check_parent( crt, parent, 0, pathlen == 0 ) == 0 ) 02272 break; 02273 02274 /* Are we part of the chain or at the top? */ 02275 if( parent != NULL ) 02276 { 02277 ret = x509_crt_verify_child( crt, parent, trust_ca, ca_crl, profile, 02278 pathlen, selfsigned, flags, f_vrfy, p_vrfy ); 02279 if( ret != 0 ) 02280 return( ret ); 02281 } 02282 else 02283 { 02284 ret = x509_crt_verify_top( crt, trust_ca, ca_crl, profile, 02285 pathlen, selfsigned, flags, f_vrfy, p_vrfy ); 02286 if( ret != 0 ) 02287 return( ret ); 02288 } 02289 } 02290 02291 if( *flags != 0 ) 02292 return( MBEDTLS_ERR_X509_CERT_VERIFY_FAILED ); 02293 02294 return( 0 ); 02295 } 02296 02297 /* 02298 * Initialize a certificate chain 02299 */ 02300 void mbedtls_x509_crt_init( mbedtls_x509_crt *crt ) 02301 { 02302 memset( crt, 0, sizeof(mbedtls_x509_crt) ); 02303 } 02304 02305 /* 02306 * Unallocate all certificate data 02307 */ 02308 void mbedtls_x509_crt_free( mbedtls_x509_crt *crt ) 02309 { 02310 mbedtls_x509_crt *cert_cur = crt; 02311 mbedtls_x509_crt *cert_prv; 02312 mbedtls_x509_name *name_cur; 02313 mbedtls_x509_name *name_prv; 02314 mbedtls_x509_sequence *seq_cur; 02315 mbedtls_x509_sequence *seq_prv; 02316 02317 if( crt == NULL ) 02318 return; 02319 02320 do 02321 { 02322 mbedtls_pk_free( &cert_cur->pk ); 02323 02324 #if defined(MBEDTLS_X509_RSASSA_PSS_SUPPORT) 02325 mbedtls_free( cert_cur->sig_opts ); 02326 #endif 02327 02328 name_cur = cert_cur->issuer.next; 02329 while( name_cur != NULL ) 02330 { 02331 name_prv = name_cur; 02332 name_cur = name_cur->next; 02333 mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); 02334 mbedtls_free( name_prv ); 02335 } 02336 02337 name_cur = cert_cur->subject.next; 02338 while( name_cur != NULL ) 02339 { 02340 name_prv = name_cur; 02341 name_cur = name_cur->next; 02342 mbedtls_zeroize( name_prv, sizeof( mbedtls_x509_name ) ); 02343 mbedtls_free( name_prv ); 02344 } 02345 02346 seq_cur = cert_cur->ext_key_usage.next; 02347 while( seq_cur != NULL ) 02348 { 02349 seq_prv = seq_cur; 02350 seq_cur = seq_cur->next; 02351 mbedtls_zeroize( seq_prv, sizeof( mbedtls_x509_sequence ) ); 02352 mbedtls_free( seq_prv ); 02353 } 02354 02355 seq_cur = cert_cur->subject_alt_names.next; 02356 while( seq_cur != NULL ) 02357 { 02358 seq_prv = seq_cur; 02359 seq_cur = seq_cur->next; 02360 mbedtls_zeroize( seq_prv, sizeof( mbedtls_x509_sequence ) ); 02361 mbedtls_free( seq_prv ); 02362 } 02363 02364 if( cert_cur->raw.p != NULL ) 02365 { 02366 mbedtls_zeroize( cert_cur->raw.p, cert_cur->raw.len ); 02367 mbedtls_free( cert_cur->raw.p ); 02368 } 02369 02370 cert_cur = cert_cur->next; 02371 } 02372 while( cert_cur != NULL ); 02373 02374 cert_cur = crt; 02375 do 02376 { 02377 cert_prv = cert_cur; 02378 cert_cur = cert_cur->next; 02379 02380 mbedtls_zeroize( cert_prv, sizeof( mbedtls_x509_crt ) ); 02381 if( cert_prv != crt ) 02382 mbedtls_free( cert_prv ); 02383 } 02384 while( cert_cur != NULL ); 02385 } 02386 02387 #endif /* MBEDTLS_X509_CRT_PARSE_C */
Generated on Tue Jul 12 2022 20:52:41 by
1.7.2