1 /* $OpenBSD: x509_cmp.c,v 1.44 2024/03/25 03:41:16 joshua Exp $ */ 2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay@cryptsoft.com). 7 * The implementation was written so as to conform with Netscapes SSL. 8 * 9 * This library is free for commercial and non-commercial use as long as 10 * the following conditions are aheared to. The following conditions 11 * apply to all code found in this distribution, be it the RC4, RSA, 12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 13 * included with this distribution is covered by the same copyright terms 14 * except that the holder is Tim Hudson (tjh@cryptsoft.com). 15 * 16 * Copyright remains Eric Young's, and as such any Copyright notices in 17 * the code are not to be removed. 18 * If this package is used in a product, Eric Young should be given attribution 19 * as the author of the parts of the library used. 20 * This can be in the form of a textual message at program startup or 21 * in documentation (online or textual) provided with the package. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 26 * 1. Redistributions of source code must retain the copyright 27 * notice, this list of conditions and the following disclaimer. 28 * 2. Redistributions in binary form must reproduce the above copyright 29 * notice, this list of conditions and the following disclaimer in the 30 * documentation and/or other materials provided with the distribution. 31 * 3. All advertising materials mentioning features or use of this software 32 * must display the following acknowledgement: 33 * "This product includes cryptographic software written by 34 * Eric Young (eay@cryptsoft.com)" 35 * The word 'cryptographic' can be left out if the rouines from the library 36 * being used are not cryptographic related :-). 37 * 4. If you include any Windows specific code (or a derivative thereof) from 38 * the apps directory (application code) you must include an acknowledgement: 39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" 40 * 41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 51 * SUCH DAMAGE. 52 * 53 * The licence and distribution terms for any publically available version or 54 * derivative of this code cannot be changed. i.e. this code cannot simply be 55 * copied and put under another distribution licence 56 * [including the GNU Public Licence.] 57 */ 58 59 #include <ctype.h> 60 #include <stdio.h> 61 #include <string.h> 62 63 #include <openssl/opensslconf.h> 64 65 #include <openssl/asn1.h> 66 #include <openssl/err.h> 67 #include <openssl/objects.h> 68 #include <openssl/x509.h> 69 #include <openssl/x509v3.h> 70 71 #include "evp_local.h" 72 #include "x509_local.h" 73 74 int 75 X509_issuer_and_serial_cmp(const X509 *a, const X509 *b) 76 { 77 int i; 78 X509_CINF *ai, *bi; 79 80 ai = a->cert_info; 81 bi = b->cert_info; 82 i = ASN1_INTEGER_cmp(ai->serialNumber, bi->serialNumber); 83 if (i) 84 return (i); 85 return (X509_NAME_cmp(ai->issuer, bi->issuer)); 86 } 87 LCRYPTO_ALIAS(X509_issuer_and_serial_cmp); 88 89 #ifndef OPENSSL_NO_MD5 90 unsigned long 91 X509_issuer_and_serial_hash(X509 *a) 92 { 93 unsigned long ret = 0; 94 EVP_MD_CTX *md_ctx; 95 unsigned char md[16]; 96 char *f = NULL; 97 98 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 99 goto err; 100 101 if ((f = X509_NAME_oneline(a->cert_info->issuer, NULL, 0)) == NULL) 102 goto err; 103 if (!EVP_DigestInit_ex(md_ctx, EVP_md5(), NULL)) 104 goto err; 105 if (!EVP_DigestUpdate(md_ctx, (unsigned char *)f, strlen(f))) 106 goto err; 107 if (!EVP_DigestUpdate(md_ctx, 108 (unsigned char *)a->cert_info->serialNumber->data, 109 (unsigned long)a->cert_info->serialNumber->length)) 110 goto err; 111 if (!EVP_DigestFinal_ex(md_ctx, &(md[0]), NULL)) 112 goto err; 113 114 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 115 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 116 0xffffffffL; 117 118 err: 119 EVP_MD_CTX_free(md_ctx); 120 free(f); 121 122 return ret; 123 } 124 LCRYPTO_ALIAS(X509_issuer_and_serial_hash); 125 #endif 126 127 int 128 X509_issuer_name_cmp(const X509 *a, const X509 *b) 129 { 130 return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer)); 131 } 132 LCRYPTO_ALIAS(X509_issuer_name_cmp); 133 134 int 135 X509_subject_name_cmp(const X509 *a, const X509 *b) 136 { 137 return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject)); 138 } 139 LCRYPTO_ALIAS(X509_subject_name_cmp); 140 141 int 142 X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b) 143 { 144 return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer)); 145 } 146 LCRYPTO_ALIAS(X509_CRL_cmp); 147 148 #ifndef OPENSSL_NO_SHA 149 int 150 X509_CRL_match(const X509_CRL *a, const X509_CRL *b) 151 { 152 return memcmp(a->hash, b->hash, X509_CRL_HASH_LEN); 153 } 154 LCRYPTO_ALIAS(X509_CRL_match); 155 #endif 156 157 X509_NAME * 158 X509_get_issuer_name(const X509 *a) 159 { 160 return (a->cert_info->issuer); 161 } 162 LCRYPTO_ALIAS(X509_get_issuer_name); 163 164 unsigned long 165 X509_issuer_name_hash(X509 *x) 166 { 167 return (X509_NAME_hash(x->cert_info->issuer)); 168 } 169 LCRYPTO_ALIAS(X509_issuer_name_hash); 170 171 #ifndef OPENSSL_NO_MD5 172 unsigned long 173 X509_issuer_name_hash_old(X509 *x) 174 { 175 return (X509_NAME_hash_old(x->cert_info->issuer)); 176 } 177 LCRYPTO_ALIAS(X509_issuer_name_hash_old); 178 #endif 179 180 X509_NAME * 181 X509_get_subject_name(const X509 *a) 182 { 183 return (a->cert_info->subject); 184 } 185 LCRYPTO_ALIAS(X509_get_subject_name); 186 187 ASN1_INTEGER * 188 X509_get_serialNumber(X509 *a) 189 { 190 return (a->cert_info->serialNumber); 191 } 192 LCRYPTO_ALIAS(X509_get_serialNumber); 193 194 const ASN1_INTEGER * 195 X509_get0_serialNumber(const X509 *a) 196 { 197 return (a->cert_info->serialNumber); 198 } 199 LCRYPTO_ALIAS(X509_get0_serialNumber); 200 201 unsigned long 202 X509_subject_name_hash(X509 *x) 203 { 204 return (X509_NAME_hash(x->cert_info->subject)); 205 } 206 LCRYPTO_ALIAS(X509_subject_name_hash); 207 208 #ifndef OPENSSL_NO_MD5 209 unsigned long 210 X509_subject_name_hash_old(X509 *x) 211 { 212 return (X509_NAME_hash_old(x->cert_info->subject)); 213 } 214 LCRYPTO_ALIAS(X509_subject_name_hash_old); 215 #endif 216 217 #ifndef OPENSSL_NO_SHA 218 /* Compare two certificates: they must be identical for 219 * this to work. NB: Although "cmp" operations are generally 220 * prototyped to take "const" arguments (eg. for use in 221 * STACKs), the way X509 handling is - these operations may 222 * involve ensuring the hashes are up-to-date and ensuring 223 * certain cert information is cached. So this is the point 224 * where the "depth-first" constification tree has to halt 225 * with an evil cast. 226 */ 227 int 228 X509_cmp(const X509 *a, const X509 *b) 229 { 230 /* ensure hash is valid */ 231 X509_check_purpose((X509 *)a, -1, 0); 232 X509_check_purpose((X509 *)b, -1, 0); 233 234 return memcmp(a->hash, b->hash, X509_CERT_HASH_LEN); 235 } 236 LCRYPTO_ALIAS(X509_cmp); 237 #endif 238 239 int 240 X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b) 241 { 242 int ret; 243 244 /* Ensure canonical encoding is present and up to date */ 245 if (!a->canon_enc || a->modified) { 246 ret = i2d_X509_NAME((X509_NAME *)a, NULL); 247 if (ret < 0) 248 return -2; 249 } 250 if (!b->canon_enc || b->modified) { 251 ret = i2d_X509_NAME((X509_NAME *)b, NULL); 252 if (ret < 0) 253 return -2; 254 } 255 ret = a->canon_enclen - b->canon_enclen; 256 if (ret) 257 return ret; 258 return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen); 259 } 260 LCRYPTO_ALIAS(X509_NAME_cmp); 261 262 unsigned long 263 X509_NAME_hash(X509_NAME *x) 264 { 265 unsigned long ret = 0; 266 unsigned char md[SHA_DIGEST_LENGTH]; 267 268 /* Make sure X509_NAME structure contains valid cached encoding */ 269 i2d_X509_NAME(x, NULL); 270 if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(), 271 NULL)) 272 return 0; 273 274 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 275 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 276 0xffffffffL; 277 return (ret); 278 } 279 LCRYPTO_ALIAS(X509_NAME_hash); 280 281 282 #ifndef OPENSSL_NO_MD5 283 /* I now DER encode the name and hash it. Since I cache the DER encoding, 284 * this is reasonably efficient. */ 285 286 unsigned long 287 X509_NAME_hash_old(X509_NAME *x) 288 { 289 EVP_MD_CTX *md_ctx; 290 unsigned long ret = 0; 291 unsigned char md[16]; 292 293 if ((md_ctx = EVP_MD_CTX_new()) == NULL) 294 return ret; 295 296 /* Make sure X509_NAME structure contains valid cached encoding */ 297 i2d_X509_NAME(x, NULL); 298 if (EVP_DigestInit_ex(md_ctx, EVP_md5(), NULL) && 299 EVP_DigestUpdate(md_ctx, x->bytes->data, x->bytes->length) && 300 EVP_DigestFinal_ex(md_ctx, md, NULL)) 301 ret = (((unsigned long)md[0]) | 302 ((unsigned long)md[1] << 8L) | 303 ((unsigned long)md[2] << 16L) | 304 ((unsigned long)md[3] << 24L)) & 305 0xffffffffL; 306 307 EVP_MD_CTX_free(md_ctx); 308 309 return ret; 310 } 311 LCRYPTO_ALIAS(X509_NAME_hash_old); 312 #endif 313 314 /* Search a stack of X509 for a match */ 315 X509 * 316 X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name, 317 ASN1_INTEGER *serial) 318 { 319 int i; 320 X509_CINF cinf; 321 X509 x, *x509 = NULL; 322 323 if (!sk) 324 return NULL; 325 326 x.cert_info = &cinf; 327 cinf.serialNumber = serial; 328 cinf.issuer = name; 329 330 for (i = 0; i < sk_X509_num(sk); i++) { 331 x509 = sk_X509_value(sk, i); 332 if (X509_issuer_and_serial_cmp(x509, &x) == 0) 333 return (x509); 334 } 335 return (NULL); 336 } 337 LCRYPTO_ALIAS(X509_find_by_issuer_and_serial); 338 339 X509 * 340 X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name) 341 { 342 X509 *x509; 343 int i; 344 345 for (i = 0; i < sk_X509_num(sk); i++) { 346 x509 = sk_X509_value(sk, i); 347 if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0) 348 return (x509); 349 } 350 return (NULL); 351 } 352 LCRYPTO_ALIAS(X509_find_by_subject); 353 354 EVP_PKEY * 355 X509_get_pubkey(X509 *x) 356 { 357 if (x == NULL || x->cert_info == NULL) 358 return (NULL); 359 return (X509_PUBKEY_get(x->cert_info->key)); 360 } 361 LCRYPTO_ALIAS(X509_get_pubkey); 362 363 EVP_PKEY * 364 X509_get0_pubkey(const X509 *x) 365 { 366 if (x == NULL || x->cert_info == NULL) 367 return (NULL); 368 return (X509_PUBKEY_get0(x->cert_info->key)); 369 } 370 LCRYPTO_ALIAS(X509_get0_pubkey); 371 372 ASN1_BIT_STRING * 373 X509_get0_pubkey_bitstr(const X509 *x) 374 { 375 if (!x) 376 return NULL; 377 return x->cert_info->key->public_key; 378 } 379 LCRYPTO_ALIAS(X509_get0_pubkey_bitstr); 380 381 int 382 X509_check_private_key(const X509 *x, const EVP_PKEY *k) 383 { 384 const EVP_PKEY *xk; 385 int ret; 386 387 xk = X509_get0_pubkey(x); 388 389 if (xk) 390 ret = EVP_PKEY_cmp(xk, k); 391 else 392 ret = -2; 393 394 switch (ret) { 395 case 1: 396 break; 397 case 0: 398 X509error(X509_R_KEY_VALUES_MISMATCH); 399 break; 400 case -1: 401 X509error(X509_R_KEY_TYPE_MISMATCH); 402 break; 403 case -2: 404 X509error(X509_R_UNKNOWN_KEY_TYPE); 405 } 406 if (ret > 0) 407 return 1; 408 return 0; 409 } 410 LCRYPTO_ALIAS(X509_check_private_key); 411 412 /* 413 * Not strictly speaking an "up_ref" as a STACK doesn't have a reference 414 * count but it has the same effect by duping the STACK and upping the ref of 415 * each X509 structure. 416 */ 417 STACK_OF(X509) * 418 X509_chain_up_ref(STACK_OF(X509) *chain) 419 { 420 STACK_OF(X509) *ret; 421 size_t i; 422 423 ret = sk_X509_dup(chain); 424 for (i = 0; i < sk_X509_num(ret); i++) 425 X509_up_ref(sk_X509_value(ret, i)); 426 427 return ret; 428 } 429 LCRYPTO_ALIAS(X509_chain_up_ref); 430