1 /* $OpenBSD: x509_cmp.c,v 1.37 2021/11/04 23:52:34 beck 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 "x509_lcl.h" 72 73 int 74 X509_issuer_and_serial_cmp(const X509 *a, const X509 *b) 75 { 76 int i; 77 X509_CINF *ai, *bi; 78 79 ai = a->cert_info; 80 bi = b->cert_info; 81 i = ASN1_INTEGER_cmp(ai->serialNumber, bi->serialNumber); 82 if (i) 83 return (i); 84 return (X509_NAME_cmp(ai->issuer, bi->issuer)); 85 } 86 87 #ifndef OPENSSL_NO_MD5 88 unsigned long 89 X509_issuer_and_serial_hash(X509 *a) 90 { 91 unsigned long ret = 0; 92 EVP_MD_CTX ctx; 93 unsigned char md[16]; 94 char *f; 95 96 EVP_MD_CTX_init(&ctx); 97 f = X509_NAME_oneline(a->cert_info->issuer, NULL, 0); 98 if (f == NULL) 99 goto err; 100 if (!EVP_DigestInit_ex(&ctx, EVP_md5(), NULL)) 101 goto err; 102 if (!EVP_DigestUpdate(&ctx, (unsigned char *)f, strlen(f))) 103 goto err; 104 free(f); 105 f = NULL; 106 if (!EVP_DigestUpdate(&ctx, 107 (unsigned char *)a->cert_info->serialNumber->data, 108 (unsigned long)a->cert_info->serialNumber->length)) 109 goto err; 110 if (!EVP_DigestFinal_ex(&ctx, &(md[0]), NULL)) 111 goto err; 112 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 113 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 114 0xffffffffL; 115 116 err: 117 EVP_MD_CTX_cleanup(&ctx); 118 free(f); 119 return (ret); 120 } 121 #endif 122 123 int 124 X509_issuer_name_cmp(const X509 *a, const X509 *b) 125 { 126 return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer)); 127 } 128 129 int 130 X509_subject_name_cmp(const X509 *a, const X509 *b) 131 { 132 return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject)); 133 } 134 135 int 136 X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b) 137 { 138 return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer)); 139 } 140 141 #ifndef OPENSSL_NO_SHA 142 int 143 X509_CRL_match(const X509_CRL *a, const X509_CRL *b) 144 { 145 return memcmp(a->sha1_hash, b->sha1_hash, 20); 146 } 147 #endif 148 149 X509_NAME * 150 X509_get_issuer_name(const X509 *a) 151 { 152 return (a->cert_info->issuer); 153 } 154 155 unsigned long 156 X509_issuer_name_hash(X509 *x) 157 { 158 return (X509_NAME_hash(x->cert_info->issuer)); 159 } 160 161 #ifndef OPENSSL_NO_MD5 162 unsigned long 163 X509_issuer_name_hash_old(X509 *x) 164 { 165 return (X509_NAME_hash_old(x->cert_info->issuer)); 166 } 167 #endif 168 169 X509_NAME * 170 X509_get_subject_name(const X509 *a) 171 { 172 return (a->cert_info->subject); 173 } 174 175 ASN1_INTEGER * 176 X509_get_serialNumber(X509 *a) 177 { 178 return (a->cert_info->serialNumber); 179 } 180 181 const ASN1_INTEGER * 182 X509_get0_serialNumber(const X509 *a) 183 { 184 return (a->cert_info->serialNumber); 185 } 186 187 unsigned long 188 X509_subject_name_hash(X509 *x) 189 { 190 return (X509_NAME_hash(x->cert_info->subject)); 191 } 192 193 #ifndef OPENSSL_NO_MD5 194 unsigned long 195 X509_subject_name_hash_old(X509 *x) 196 { 197 return (X509_NAME_hash_old(x->cert_info->subject)); 198 } 199 #endif 200 201 #ifndef OPENSSL_NO_SHA 202 /* Compare two certificates: they must be identical for 203 * this to work. NB: Although "cmp" operations are generally 204 * prototyped to take "const" arguments (eg. for use in 205 * STACKs), the way X509 handling is - these operations may 206 * involve ensuring the hashes are up-to-date and ensuring 207 * certain cert information is cached. So this is the point 208 * where the "depth-first" constification tree has to halt 209 * with an evil cast. 210 */ 211 int 212 X509_cmp(const X509 *a, const X509 *b) 213 { 214 /* ensure hash is valid */ 215 X509_check_purpose((X509 *)a, -1, 0); 216 X509_check_purpose((X509 *)b, -1, 0); 217 218 return memcmp(a->hash, b->hash, X509_CERT_HASH_LEN); 219 } 220 #endif 221 222 int 223 X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b) 224 { 225 int ret; 226 227 /* Ensure canonical encoding is present and up to date */ 228 if (!a->canon_enc || a->modified) { 229 ret = i2d_X509_NAME((X509_NAME *)a, NULL); 230 if (ret < 0) 231 return -2; 232 } 233 if (!b->canon_enc || b->modified) { 234 ret = i2d_X509_NAME((X509_NAME *)b, NULL); 235 if (ret < 0) 236 return -2; 237 } 238 ret = a->canon_enclen - b->canon_enclen; 239 if (ret) 240 return ret; 241 return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen); 242 } 243 244 unsigned long 245 X509_NAME_hash(X509_NAME *x) 246 { 247 unsigned long ret = 0; 248 unsigned char md[SHA_DIGEST_LENGTH]; 249 250 /* Make sure X509_NAME structure contains valid cached encoding */ 251 i2d_X509_NAME(x, NULL); 252 if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(), 253 NULL)) 254 return 0; 255 256 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 257 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 258 0xffffffffL; 259 return (ret); 260 } 261 262 263 #ifndef OPENSSL_NO_MD5 264 /* I now DER encode the name and hash it. Since I cache the DER encoding, 265 * this is reasonably efficient. */ 266 267 unsigned long 268 X509_NAME_hash_old(X509_NAME *x) 269 { 270 EVP_MD_CTX md_ctx; 271 unsigned long ret = 0; 272 unsigned char md[16]; 273 274 /* Make sure X509_NAME structure contains valid cached encoding */ 275 i2d_X509_NAME(x, NULL); 276 EVP_MD_CTX_init(&md_ctx); 277 if (EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL) && 278 EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length) && 279 EVP_DigestFinal_ex(&md_ctx, md, NULL)) 280 ret = (((unsigned long)md[0]) | 281 ((unsigned long)md[1] << 8L) | 282 ((unsigned long)md[2] << 16L) | 283 ((unsigned long)md[3] << 24L)) & 284 0xffffffffL; 285 EVP_MD_CTX_cleanup(&md_ctx); 286 287 return (ret); 288 } 289 #endif 290 291 /* Search a stack of X509 for a match */ 292 X509 * 293 X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name, 294 ASN1_INTEGER *serial) 295 { 296 int i; 297 X509_CINF cinf; 298 X509 x, *x509 = NULL; 299 300 if (!sk) 301 return NULL; 302 303 x.cert_info = &cinf; 304 cinf.serialNumber = serial; 305 cinf.issuer = name; 306 307 for (i = 0; i < sk_X509_num(sk); i++) { 308 x509 = sk_X509_value(sk, i); 309 if (X509_issuer_and_serial_cmp(x509, &x) == 0) 310 return (x509); 311 } 312 return (NULL); 313 } 314 315 X509 * 316 X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name) 317 { 318 X509 *x509; 319 int i; 320 321 for (i = 0; i < sk_X509_num(sk); i++) { 322 x509 = sk_X509_value(sk, i); 323 if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0) 324 return (x509); 325 } 326 return (NULL); 327 } 328 329 EVP_PKEY * 330 X509_get_pubkey(X509 *x) 331 { 332 if (x == NULL || x->cert_info == NULL) 333 return (NULL); 334 return (X509_PUBKEY_get(x->cert_info->key)); 335 } 336 337 EVP_PKEY * 338 X509_get0_pubkey(const X509 *x) 339 { 340 if (x == NULL || x->cert_info == NULL) 341 return (NULL); 342 return (X509_PUBKEY_get0(x->cert_info->key)); 343 } 344 345 ASN1_BIT_STRING * 346 X509_get0_pubkey_bitstr(const X509 *x) 347 { 348 if (!x) 349 return NULL; 350 return x->cert_info->key->public_key; 351 } 352 353 int 354 X509_check_private_key(const X509 *x, const EVP_PKEY *k) 355 { 356 const EVP_PKEY *xk; 357 int ret; 358 359 xk = X509_get0_pubkey(x); 360 361 if (xk) 362 ret = EVP_PKEY_cmp(xk, k); 363 else 364 ret = -2; 365 366 switch (ret) { 367 case 1: 368 break; 369 case 0: 370 X509error(X509_R_KEY_VALUES_MISMATCH); 371 break; 372 case -1: 373 X509error(X509_R_KEY_TYPE_MISMATCH); 374 break; 375 case -2: 376 X509error(X509_R_UNKNOWN_KEY_TYPE); 377 } 378 if (ret > 0) 379 return 1; 380 return 0; 381 } 382 383 /* 384 * Not strictly speaking an "up_ref" as a STACK doesn't have a reference 385 * count but it has the same effect by duping the STACK and upping the ref of 386 * each X509 structure. 387 */ 388 STACK_OF(X509) * 389 X509_chain_up_ref(STACK_OF(X509) *chain) 390 { 391 STACK_OF(X509) *ret; 392 size_t i; 393 394 ret = sk_X509_dup(chain); 395 for (i = 0; i < sk_X509_num(ret); i++) 396 X509_up_ref(sk_X509_value(ret, i)); 397 398 return ret; 399 } 400