1 /* $OpenBSD: x509_cmp.c,v 1.39 2022/02/24 22:05:06 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 "evp_locl.h" 72 #include "x509_lcl.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 88 #ifndef OPENSSL_NO_MD5 89 unsigned long 90 X509_issuer_and_serial_hash(X509 *a) 91 { 92 unsigned long ret = 0; 93 EVP_MD_CTX ctx; 94 unsigned char md[16]; 95 char *f; 96 97 EVP_MD_CTX_init(&ctx); 98 f = X509_NAME_oneline(a->cert_info->issuer, NULL, 0); 99 if (f == NULL) 100 goto err; 101 if (!EVP_DigestInit_ex(&ctx, EVP_md5(), NULL)) 102 goto err; 103 if (!EVP_DigestUpdate(&ctx, (unsigned char *)f, strlen(f))) 104 goto err; 105 free(f); 106 f = NULL; 107 if (!EVP_DigestUpdate(&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(&ctx, &(md[0]), NULL)) 112 goto err; 113 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 114 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 115 0xffffffffL; 116 117 err: 118 EVP_MD_CTX_cleanup(&ctx); 119 free(f); 120 return (ret); 121 } 122 #endif 123 124 int 125 X509_issuer_name_cmp(const X509 *a, const X509 *b) 126 { 127 return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer)); 128 } 129 130 int 131 X509_subject_name_cmp(const X509 *a, const X509 *b) 132 { 133 return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject)); 134 } 135 136 int 137 X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b) 138 { 139 return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer)); 140 } 141 142 #ifndef OPENSSL_NO_SHA 143 int 144 X509_CRL_match(const X509_CRL *a, const X509_CRL *b) 145 { 146 return memcmp(a->hash, b->hash, X509_CRL_HASH_LEN); 147 } 148 #endif 149 150 X509_NAME * 151 X509_get_issuer_name(const X509 *a) 152 { 153 return (a->cert_info->issuer); 154 } 155 156 unsigned long 157 X509_issuer_name_hash(X509 *x) 158 { 159 return (X509_NAME_hash(x->cert_info->issuer)); 160 } 161 162 #ifndef OPENSSL_NO_MD5 163 unsigned long 164 X509_issuer_name_hash_old(X509 *x) 165 { 166 return (X509_NAME_hash_old(x->cert_info->issuer)); 167 } 168 #endif 169 170 X509_NAME * 171 X509_get_subject_name(const X509 *a) 172 { 173 return (a->cert_info->subject); 174 } 175 176 ASN1_INTEGER * 177 X509_get_serialNumber(X509 *a) 178 { 179 return (a->cert_info->serialNumber); 180 } 181 182 const ASN1_INTEGER * 183 X509_get0_serialNumber(const X509 *a) 184 { 185 return (a->cert_info->serialNumber); 186 } 187 188 unsigned long 189 X509_subject_name_hash(X509 *x) 190 { 191 return (X509_NAME_hash(x->cert_info->subject)); 192 } 193 194 #ifndef OPENSSL_NO_MD5 195 unsigned long 196 X509_subject_name_hash_old(X509 *x) 197 { 198 return (X509_NAME_hash_old(x->cert_info->subject)); 199 } 200 #endif 201 202 #ifndef OPENSSL_NO_SHA 203 /* Compare two certificates: they must be identical for 204 * this to work. NB: Although "cmp" operations are generally 205 * prototyped to take "const" arguments (eg. for use in 206 * STACKs), the way X509 handling is - these operations may 207 * involve ensuring the hashes are up-to-date and ensuring 208 * certain cert information is cached. So this is the point 209 * where the "depth-first" constification tree has to halt 210 * with an evil cast. 211 */ 212 int 213 X509_cmp(const X509 *a, const X509 *b) 214 { 215 /* ensure hash is valid */ 216 X509_check_purpose((X509 *)a, -1, 0); 217 X509_check_purpose((X509 *)b, -1, 0); 218 219 return memcmp(a->hash, b->hash, X509_CERT_HASH_LEN); 220 } 221 #endif 222 223 int 224 X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b) 225 { 226 int ret; 227 228 /* Ensure canonical encoding is present and up to date */ 229 if (!a->canon_enc || a->modified) { 230 ret = i2d_X509_NAME((X509_NAME *)a, NULL); 231 if (ret < 0) 232 return -2; 233 } 234 if (!b->canon_enc || b->modified) { 235 ret = i2d_X509_NAME((X509_NAME *)b, NULL); 236 if (ret < 0) 237 return -2; 238 } 239 ret = a->canon_enclen - b->canon_enclen; 240 if (ret) 241 return ret; 242 return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen); 243 } 244 245 unsigned long 246 X509_NAME_hash(X509_NAME *x) 247 { 248 unsigned long ret = 0; 249 unsigned char md[SHA_DIGEST_LENGTH]; 250 251 /* Make sure X509_NAME structure contains valid cached encoding */ 252 i2d_X509_NAME(x, NULL); 253 if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(), 254 NULL)) 255 return 0; 256 257 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 258 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 259 0xffffffffL; 260 return (ret); 261 } 262 263 264 #ifndef OPENSSL_NO_MD5 265 /* I now DER encode the name and hash it. Since I cache the DER encoding, 266 * this is reasonably efficient. */ 267 268 unsigned long 269 X509_NAME_hash_old(X509_NAME *x) 270 { 271 EVP_MD_CTX md_ctx; 272 unsigned long ret = 0; 273 unsigned char md[16]; 274 275 /* Make sure X509_NAME structure contains valid cached encoding */ 276 i2d_X509_NAME(x, NULL); 277 EVP_MD_CTX_init(&md_ctx); 278 if (EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL) && 279 EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length) && 280 EVP_DigestFinal_ex(&md_ctx, md, NULL)) 281 ret = (((unsigned long)md[0]) | 282 ((unsigned long)md[1] << 8L) | 283 ((unsigned long)md[2] << 16L) | 284 ((unsigned long)md[3] << 24L)) & 285 0xffffffffL; 286 EVP_MD_CTX_cleanup(&md_ctx); 287 288 return (ret); 289 } 290 #endif 291 292 /* Search a stack of X509 for a match */ 293 X509 * 294 X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name, 295 ASN1_INTEGER *serial) 296 { 297 int i; 298 X509_CINF cinf; 299 X509 x, *x509 = NULL; 300 301 if (!sk) 302 return NULL; 303 304 x.cert_info = &cinf; 305 cinf.serialNumber = serial; 306 cinf.issuer = name; 307 308 for (i = 0; i < sk_X509_num(sk); i++) { 309 x509 = sk_X509_value(sk, i); 310 if (X509_issuer_and_serial_cmp(x509, &x) == 0) 311 return (x509); 312 } 313 return (NULL); 314 } 315 316 X509 * 317 X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name) 318 { 319 X509 *x509; 320 int i; 321 322 for (i = 0; i < sk_X509_num(sk); i++) { 323 x509 = sk_X509_value(sk, i); 324 if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0) 325 return (x509); 326 } 327 return (NULL); 328 } 329 330 EVP_PKEY * 331 X509_get_pubkey(X509 *x) 332 { 333 if (x == NULL || x->cert_info == NULL) 334 return (NULL); 335 return (X509_PUBKEY_get(x->cert_info->key)); 336 } 337 338 EVP_PKEY * 339 X509_get0_pubkey(const X509 *x) 340 { 341 if (x == NULL || x->cert_info == NULL) 342 return (NULL); 343 return (X509_PUBKEY_get0(x->cert_info->key)); 344 } 345 346 ASN1_BIT_STRING * 347 X509_get0_pubkey_bitstr(const X509 *x) 348 { 349 if (!x) 350 return NULL; 351 return x->cert_info->key->public_key; 352 } 353 354 int 355 X509_check_private_key(const X509 *x, const EVP_PKEY *k) 356 { 357 const EVP_PKEY *xk; 358 int ret; 359 360 xk = X509_get0_pubkey(x); 361 362 if (xk) 363 ret = EVP_PKEY_cmp(xk, k); 364 else 365 ret = -2; 366 367 switch (ret) { 368 case 1: 369 break; 370 case 0: 371 X509error(X509_R_KEY_VALUES_MISMATCH); 372 break; 373 case -1: 374 X509error(X509_R_KEY_TYPE_MISMATCH); 375 break; 376 case -2: 377 X509error(X509_R_UNKNOWN_KEY_TYPE); 378 } 379 if (ret > 0) 380 return 1; 381 return 0; 382 } 383 384 /* 385 * Not strictly speaking an "up_ref" as a STACK doesn't have a reference 386 * count but it has the same effect by duping the STACK and upping the ref of 387 * each X509 structure. 388 */ 389 STACK_OF(X509) * 390 X509_chain_up_ref(STACK_OF(X509) *chain) 391 { 392 STACK_OF(X509) *ret; 393 size_t i; 394 395 ret = sk_X509_dup(chain); 396 for (i = 0; i < sk_X509_num(ret); i++) 397 X509_up_ref(sk_X509_value(ret, i)); 398 399 return ret; 400 } 401