1 /* $OpenBSD: x509_cmp.c,v 1.42 2023/02/16 08:38:17 tb 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 ctx; 95 unsigned char md[16]; 96 char *f; 97 98 EVP_MD_CTX_init(&ctx); 99 f = X509_NAME_oneline(a->cert_info->issuer, NULL, 0); 100 if (f == NULL) 101 goto err; 102 if (!EVP_DigestInit_ex(&ctx, EVP_md5(), NULL)) 103 goto err; 104 if (!EVP_DigestUpdate(&ctx, (unsigned char *)f, strlen(f))) 105 goto err; 106 free(f); 107 f = NULL; 108 if (!EVP_DigestUpdate(&ctx, 109 (unsigned char *)a->cert_info->serialNumber->data, 110 (unsigned long)a->cert_info->serialNumber->length)) 111 goto err; 112 if (!EVP_DigestFinal_ex(&ctx, &(md[0]), NULL)) 113 goto err; 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_cleanup(&ctx); 120 free(f); 121 return (ret); 122 } 123 LCRYPTO_ALIAS(X509_issuer_and_serial_hash); 124 #endif 125 126 int 127 X509_issuer_name_cmp(const X509 *a, const X509 *b) 128 { 129 return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer)); 130 } 131 LCRYPTO_ALIAS(X509_issuer_name_cmp); 132 133 int 134 X509_subject_name_cmp(const X509 *a, const X509 *b) 135 { 136 return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject)); 137 } 138 LCRYPTO_ALIAS(X509_subject_name_cmp); 139 140 int 141 X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b) 142 { 143 return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer)); 144 } 145 LCRYPTO_ALIAS(X509_CRL_cmp); 146 147 #ifndef OPENSSL_NO_SHA 148 int 149 X509_CRL_match(const X509_CRL *a, const X509_CRL *b) 150 { 151 return memcmp(a->hash, b->hash, X509_CRL_HASH_LEN); 152 } 153 LCRYPTO_ALIAS(X509_CRL_match); 154 #endif 155 156 X509_NAME * 157 X509_get_issuer_name(const X509 *a) 158 { 159 return (a->cert_info->issuer); 160 } 161 LCRYPTO_ALIAS(X509_get_issuer_name); 162 163 unsigned long 164 X509_issuer_name_hash(X509 *x) 165 { 166 return (X509_NAME_hash(x->cert_info->issuer)); 167 } 168 LCRYPTO_ALIAS(X509_issuer_name_hash); 169 170 #ifndef OPENSSL_NO_MD5 171 unsigned long 172 X509_issuer_name_hash_old(X509 *x) 173 { 174 return (X509_NAME_hash_old(x->cert_info->issuer)); 175 } 176 LCRYPTO_ALIAS(X509_issuer_name_hash_old); 177 #endif 178 179 X509_NAME * 180 X509_get_subject_name(const X509 *a) 181 { 182 return (a->cert_info->subject); 183 } 184 LCRYPTO_ALIAS(X509_get_subject_name); 185 186 ASN1_INTEGER * 187 X509_get_serialNumber(X509 *a) 188 { 189 return (a->cert_info->serialNumber); 190 } 191 LCRYPTO_ALIAS(X509_get_serialNumber); 192 193 const ASN1_INTEGER * 194 X509_get0_serialNumber(const X509 *a) 195 { 196 return (a->cert_info->serialNumber); 197 } 198 LCRYPTO_ALIAS(X509_get0_serialNumber); 199 200 unsigned long 201 X509_subject_name_hash(X509 *x) 202 { 203 return (X509_NAME_hash(x->cert_info->subject)); 204 } 205 LCRYPTO_ALIAS(X509_subject_name_hash); 206 207 #ifndef OPENSSL_NO_MD5 208 unsigned long 209 X509_subject_name_hash_old(X509 *x) 210 { 211 return (X509_NAME_hash_old(x->cert_info->subject)); 212 } 213 LCRYPTO_ALIAS(X509_subject_name_hash_old); 214 #endif 215 216 #ifndef OPENSSL_NO_SHA 217 /* Compare two certificates: they must be identical for 218 * this to work. NB: Although "cmp" operations are generally 219 * prototyped to take "const" arguments (eg. for use in 220 * STACKs), the way X509 handling is - these operations may 221 * involve ensuring the hashes are up-to-date and ensuring 222 * certain cert information is cached. So this is the point 223 * where the "depth-first" constification tree has to halt 224 * with an evil cast. 225 */ 226 int 227 X509_cmp(const X509 *a, const X509 *b) 228 { 229 /* ensure hash is valid */ 230 X509_check_purpose((X509 *)a, -1, 0); 231 X509_check_purpose((X509 *)b, -1, 0); 232 233 return memcmp(a->hash, b->hash, X509_CERT_HASH_LEN); 234 } 235 LCRYPTO_ALIAS(X509_cmp); 236 #endif 237 238 int 239 X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b) 240 { 241 int ret; 242 243 /* Ensure canonical encoding is present and up to date */ 244 if (!a->canon_enc || a->modified) { 245 ret = i2d_X509_NAME((X509_NAME *)a, NULL); 246 if (ret < 0) 247 return -2; 248 } 249 if (!b->canon_enc || b->modified) { 250 ret = i2d_X509_NAME((X509_NAME *)b, NULL); 251 if (ret < 0) 252 return -2; 253 } 254 ret = a->canon_enclen - b->canon_enclen; 255 if (ret) 256 return ret; 257 return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen); 258 } 259 LCRYPTO_ALIAS(X509_NAME_cmp); 260 261 unsigned long 262 X509_NAME_hash(X509_NAME *x) 263 { 264 unsigned long ret = 0; 265 unsigned char md[SHA_DIGEST_LENGTH]; 266 267 /* Make sure X509_NAME structure contains valid cached encoding */ 268 i2d_X509_NAME(x, NULL); 269 if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(), 270 NULL)) 271 return 0; 272 273 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 274 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 275 0xffffffffL; 276 return (ret); 277 } 278 LCRYPTO_ALIAS(X509_NAME_hash); 279 280 281 #ifndef OPENSSL_NO_MD5 282 /* I now DER encode the name and hash it. Since I cache the DER encoding, 283 * this is reasonably efficient. */ 284 285 unsigned long 286 X509_NAME_hash_old(X509_NAME *x) 287 { 288 EVP_MD_CTX md_ctx; 289 unsigned long ret = 0; 290 unsigned char md[16]; 291 292 /* Make sure X509_NAME structure contains valid cached encoding */ 293 i2d_X509_NAME(x, NULL); 294 EVP_MD_CTX_init(&md_ctx); 295 if (EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL) && 296 EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length) && 297 EVP_DigestFinal_ex(&md_ctx, md, NULL)) 298 ret = (((unsigned long)md[0]) | 299 ((unsigned long)md[1] << 8L) | 300 ((unsigned long)md[2] << 16L) | 301 ((unsigned long)md[3] << 24L)) & 302 0xffffffffL; 303 EVP_MD_CTX_cleanup(&md_ctx); 304 305 return (ret); 306 } 307 LCRYPTO_ALIAS(X509_NAME_hash_old); 308 #endif 309 310 /* Search a stack of X509 for a match */ 311 X509 * 312 X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name, 313 ASN1_INTEGER *serial) 314 { 315 int i; 316 X509_CINF cinf; 317 X509 x, *x509 = NULL; 318 319 if (!sk) 320 return NULL; 321 322 x.cert_info = &cinf; 323 cinf.serialNumber = serial; 324 cinf.issuer = name; 325 326 for (i = 0; i < sk_X509_num(sk); i++) { 327 x509 = sk_X509_value(sk, i); 328 if (X509_issuer_and_serial_cmp(x509, &x) == 0) 329 return (x509); 330 } 331 return (NULL); 332 } 333 LCRYPTO_ALIAS(X509_find_by_issuer_and_serial); 334 335 X509 * 336 X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name) 337 { 338 X509 *x509; 339 int i; 340 341 for (i = 0; i < sk_X509_num(sk); i++) { 342 x509 = sk_X509_value(sk, i); 343 if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0) 344 return (x509); 345 } 346 return (NULL); 347 } 348 LCRYPTO_ALIAS(X509_find_by_subject); 349 350 EVP_PKEY * 351 X509_get_pubkey(X509 *x) 352 { 353 if (x == NULL || x->cert_info == NULL) 354 return (NULL); 355 return (X509_PUBKEY_get(x->cert_info->key)); 356 } 357 LCRYPTO_ALIAS(X509_get_pubkey); 358 359 EVP_PKEY * 360 X509_get0_pubkey(const X509 *x) 361 { 362 if (x == NULL || x->cert_info == NULL) 363 return (NULL); 364 return (X509_PUBKEY_get0(x->cert_info->key)); 365 } 366 LCRYPTO_ALIAS(X509_get0_pubkey); 367 368 ASN1_BIT_STRING * 369 X509_get0_pubkey_bitstr(const X509 *x) 370 { 371 if (!x) 372 return NULL; 373 return x->cert_info->key->public_key; 374 } 375 LCRYPTO_ALIAS(X509_get0_pubkey_bitstr); 376 377 int 378 X509_check_private_key(const X509 *x, const EVP_PKEY *k) 379 { 380 const EVP_PKEY *xk; 381 int ret; 382 383 xk = X509_get0_pubkey(x); 384 385 if (xk) 386 ret = EVP_PKEY_cmp(xk, k); 387 else 388 ret = -2; 389 390 switch (ret) { 391 case 1: 392 break; 393 case 0: 394 X509error(X509_R_KEY_VALUES_MISMATCH); 395 break; 396 case -1: 397 X509error(X509_R_KEY_TYPE_MISMATCH); 398 break; 399 case -2: 400 X509error(X509_R_UNKNOWN_KEY_TYPE); 401 } 402 if (ret > 0) 403 return 1; 404 return 0; 405 } 406 LCRYPTO_ALIAS(X509_check_private_key); 407 408 /* 409 * Not strictly speaking an "up_ref" as a STACK doesn't have a reference 410 * count but it has the same effect by duping the STACK and upping the ref of 411 * each X509 structure. 412 */ 413 STACK_OF(X509) * 414 X509_chain_up_ref(STACK_OF(X509) *chain) 415 { 416 STACK_OF(X509) *ret; 417 size_t i; 418 419 ret = sk_X509_dup(chain); 420 for (i = 0; i < sk_X509_num(ret); i++) 421 X509_up_ref(sk_X509_value(ret, i)); 422 423 return ret; 424 } 425 LCRYPTO_ALIAS(X509_chain_up_ref); 426