1 /* $OpenBSD: x509_cmp.c,v 1.35 2019/03/13 20:34:00 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 int 72 X509_issuer_and_serial_cmp(const X509 *a, const X509 *b) 73 { 74 int i; 75 X509_CINF *ai, *bi; 76 77 ai = a->cert_info; 78 bi = b->cert_info; 79 i = ASN1_INTEGER_cmp(ai->serialNumber, bi->serialNumber); 80 if (i) 81 return (i); 82 return (X509_NAME_cmp(ai->issuer, bi->issuer)); 83 } 84 85 #ifndef OPENSSL_NO_MD5 86 unsigned long 87 X509_issuer_and_serial_hash(X509 *a) 88 { 89 unsigned long ret = 0; 90 EVP_MD_CTX ctx; 91 unsigned char md[16]; 92 char *f; 93 94 EVP_MD_CTX_init(&ctx); 95 f = X509_NAME_oneline(a->cert_info->issuer, NULL, 0); 96 if (f == NULL) 97 goto err; 98 if (!EVP_DigestInit_ex(&ctx, EVP_md5(), NULL)) 99 goto err; 100 if (!EVP_DigestUpdate(&ctx, (unsigned char *)f, strlen(f))) 101 goto err; 102 free(f); 103 f = NULL; 104 if (!EVP_DigestUpdate(&ctx, 105 (unsigned char *)a->cert_info->serialNumber->data, 106 (unsigned long)a->cert_info->serialNumber->length)) 107 goto err; 108 if (!EVP_DigestFinal_ex(&ctx, &(md[0]), NULL)) 109 goto err; 110 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 111 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 112 0xffffffffL; 113 114 err: 115 EVP_MD_CTX_cleanup(&ctx); 116 free(f); 117 return (ret); 118 } 119 #endif 120 121 int 122 X509_issuer_name_cmp(const X509 *a, const X509 *b) 123 { 124 return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer)); 125 } 126 127 int 128 X509_subject_name_cmp(const X509 *a, const X509 *b) 129 { 130 return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject)); 131 } 132 133 int 134 X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b) 135 { 136 return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer)); 137 } 138 139 #ifndef OPENSSL_NO_SHA 140 int 141 X509_CRL_match(const X509_CRL *a, const X509_CRL *b) 142 { 143 return memcmp(a->sha1_hash, b->sha1_hash, 20); 144 } 145 #endif 146 147 X509_NAME * 148 X509_get_issuer_name(const X509 *a) 149 { 150 return (a->cert_info->issuer); 151 } 152 153 unsigned long 154 X509_issuer_name_hash(X509 *x) 155 { 156 return (X509_NAME_hash(x->cert_info->issuer)); 157 } 158 159 #ifndef OPENSSL_NO_MD5 160 unsigned long 161 X509_issuer_name_hash_old(X509 *x) 162 { 163 return (X509_NAME_hash_old(x->cert_info->issuer)); 164 } 165 #endif 166 167 X509_NAME * 168 X509_get_subject_name(const X509 *a) 169 { 170 return (a->cert_info->subject); 171 } 172 173 ASN1_INTEGER * 174 X509_get_serialNumber(X509 *a) 175 { 176 return (a->cert_info->serialNumber); 177 } 178 179 const ASN1_INTEGER * 180 X509_get0_serialNumber(const X509 *a) 181 { 182 return (a->cert_info->serialNumber); 183 } 184 185 unsigned long 186 X509_subject_name_hash(X509 *x) 187 { 188 return (X509_NAME_hash(x->cert_info->subject)); 189 } 190 191 #ifndef OPENSSL_NO_MD5 192 unsigned long 193 X509_subject_name_hash_old(X509 *x) 194 { 195 return (X509_NAME_hash_old(x->cert_info->subject)); 196 } 197 #endif 198 199 #ifndef OPENSSL_NO_SHA 200 /* Compare two certificates: they must be identical for 201 * this to work. NB: Although "cmp" operations are generally 202 * prototyped to take "const" arguments (eg. for use in 203 * STACKs), the way X509 handling is - these operations may 204 * involve ensuring the hashes are up-to-date and ensuring 205 * certain cert information is cached. So this is the point 206 * where the "depth-first" constification tree has to halt 207 * with an evil cast. 208 */ 209 int 210 X509_cmp(const X509 *a, const X509 *b) 211 { 212 /* ensure hash is valid */ 213 X509_check_purpose((X509 *)a, -1, 0); 214 X509_check_purpose((X509 *)b, -1, 0); 215 216 return memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH); 217 } 218 #endif 219 220 int 221 X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b) 222 { 223 int ret; 224 225 /* Ensure canonical encoding is present and up to date */ 226 if (!a->canon_enc || a->modified) { 227 ret = i2d_X509_NAME((X509_NAME *)a, NULL); 228 if (ret < 0) 229 return -2; 230 } 231 if (!b->canon_enc || b->modified) { 232 ret = i2d_X509_NAME((X509_NAME *)b, NULL); 233 if (ret < 0) 234 return -2; 235 } 236 ret = a->canon_enclen - b->canon_enclen; 237 if (ret) 238 return ret; 239 return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen); 240 } 241 242 unsigned long 243 X509_NAME_hash(X509_NAME *x) 244 { 245 unsigned long ret = 0; 246 unsigned char md[SHA_DIGEST_LENGTH]; 247 248 /* Make sure X509_NAME structure contains valid cached encoding */ 249 i2d_X509_NAME(x, NULL); 250 if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(), 251 NULL)) 252 return 0; 253 254 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 255 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 256 0xffffffffL; 257 return (ret); 258 } 259 260 261 #ifndef OPENSSL_NO_MD5 262 /* I now DER encode the name and hash it. Since I cache the DER encoding, 263 * this is reasonably efficient. */ 264 265 unsigned long 266 X509_NAME_hash_old(X509_NAME *x) 267 { 268 EVP_MD_CTX md_ctx; 269 unsigned long ret = 0; 270 unsigned char md[16]; 271 272 /* Make sure X509_NAME structure contains valid cached encoding */ 273 i2d_X509_NAME(x, NULL); 274 EVP_MD_CTX_init(&md_ctx); 275 if (EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL) && 276 EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length) && 277 EVP_DigestFinal_ex(&md_ctx, md, NULL)) 278 ret = (((unsigned long)md[0]) | 279 ((unsigned long)md[1] << 8L) | 280 ((unsigned long)md[2] << 16L) | 281 ((unsigned long)md[3] << 24L)) & 282 0xffffffffL; 283 EVP_MD_CTX_cleanup(&md_ctx); 284 285 return (ret); 286 } 287 #endif 288 289 /* Search a stack of X509 for a match */ 290 X509 * 291 X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name, 292 ASN1_INTEGER *serial) 293 { 294 int i; 295 X509_CINF cinf; 296 X509 x, *x509 = NULL; 297 298 if (!sk) 299 return NULL; 300 301 x.cert_info = &cinf; 302 cinf.serialNumber = serial; 303 cinf.issuer = name; 304 305 for (i = 0; i < sk_X509_num(sk); i++) { 306 x509 = sk_X509_value(sk, i); 307 if (X509_issuer_and_serial_cmp(x509, &x) == 0) 308 return (x509); 309 } 310 return (NULL); 311 } 312 313 X509 * 314 X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name) 315 { 316 X509 *x509; 317 int i; 318 319 for (i = 0; i < sk_X509_num(sk); i++) { 320 x509 = sk_X509_value(sk, i); 321 if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0) 322 return (x509); 323 } 324 return (NULL); 325 } 326 327 EVP_PKEY * 328 X509_get_pubkey(X509 *x) 329 { 330 if (x == NULL || x->cert_info == NULL) 331 return (NULL); 332 return (X509_PUBKEY_get(x->cert_info->key)); 333 } 334 335 EVP_PKEY * 336 X509_get0_pubkey(const X509 *x) 337 { 338 if (x == NULL || x->cert_info == NULL) 339 return (NULL); 340 return (X509_PUBKEY_get0(x->cert_info->key)); 341 } 342 343 ASN1_BIT_STRING * 344 X509_get0_pubkey_bitstr(const X509 *x) 345 { 346 if (!x) 347 return NULL; 348 return x->cert_info->key->public_key; 349 } 350 351 int 352 X509_check_private_key(const X509 *x, const EVP_PKEY *k) 353 { 354 const EVP_PKEY *xk; 355 int ret; 356 357 xk = X509_get0_pubkey(x); 358 359 if (xk) 360 ret = EVP_PKEY_cmp(xk, k); 361 else 362 ret = -2; 363 364 switch (ret) { 365 case 1: 366 break; 367 case 0: 368 X509error(X509_R_KEY_VALUES_MISMATCH); 369 break; 370 case -1: 371 X509error(X509_R_KEY_TYPE_MISMATCH); 372 break; 373 case -2: 374 X509error(X509_R_UNKNOWN_KEY_TYPE); 375 } 376 if (ret > 0) 377 return 1; 378 return 0; 379 } 380 381 /* 382 * Not strictly speaking an "up_ref" as a STACK doesn't have a reference 383 * count but it has the same effect by duping the STACK and upping the ref of 384 * each X509 structure. 385 */ 386 STACK_OF(X509) * 387 X509_chain_up_ref(STACK_OF(X509) *chain) 388 { 389 STACK_OF(X509) *ret; 390 size_t i; 391 392 ret = sk_X509_dup(chain); 393 for (i = 0; i < sk_X509_num(ret); i++) 394 X509_up_ref(sk_X509_value(ret, i)); 395 396 return ret; 397 } 398