1 /* $OpenBSD: x509_cmp.c,v 1.24 2014/07/13 11:15:54 miod 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 = M_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 if (!EVP_DigestUpdate(&ctx, 104 (unsigned char *)a->cert_info->serialNumber->data, 105 (unsigned long)a->cert_info->serialNumber->length)) 106 goto err; 107 if (!EVP_DigestFinal_ex(&ctx, &(md[0]), NULL)) 108 goto err; 109 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 110 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 111 0xffffffffL; 112 113 err: 114 EVP_MD_CTX_cleanup(&ctx); 115 return (ret); 116 } 117 #endif 118 119 int 120 X509_issuer_name_cmp(const X509 *a, const X509 *b) 121 { 122 return (X509_NAME_cmp(a->cert_info->issuer, b->cert_info->issuer)); 123 } 124 125 int 126 X509_subject_name_cmp(const X509 *a, const X509 *b) 127 { 128 return (X509_NAME_cmp(a->cert_info->subject, b->cert_info->subject)); 129 } 130 131 int 132 X509_CRL_cmp(const X509_CRL *a, const X509_CRL *b) 133 { 134 return (X509_NAME_cmp(a->crl->issuer, b->crl->issuer)); 135 } 136 137 #ifndef OPENSSL_NO_SHA 138 int 139 X509_CRL_match(const X509_CRL *a, const X509_CRL *b) 140 { 141 return memcmp(a->sha1_hash, b->sha1_hash, 20); 142 } 143 #endif 144 145 X509_NAME * 146 X509_get_issuer_name(X509 *a) 147 { 148 return (a->cert_info->issuer); 149 } 150 151 unsigned long 152 X509_issuer_name_hash(X509 *x) 153 { 154 return (X509_NAME_hash(x->cert_info->issuer)); 155 } 156 157 #ifndef OPENSSL_NO_MD5 158 unsigned long 159 X509_issuer_name_hash_old(X509 *x) 160 { 161 return (X509_NAME_hash_old(x->cert_info->issuer)); 162 } 163 #endif 164 165 X509_NAME * 166 X509_get_subject_name(X509 *a) 167 { 168 return (a->cert_info->subject); 169 } 170 171 ASN1_INTEGER * 172 X509_get_serialNumber(X509 *a) 173 { 174 return (a->cert_info->serialNumber); 175 } 176 177 unsigned long 178 X509_subject_name_hash(X509 *x) 179 { 180 return (X509_NAME_hash(x->cert_info->subject)); 181 } 182 183 #ifndef OPENSSL_NO_MD5 184 unsigned long 185 X509_subject_name_hash_old(X509 *x) 186 { 187 return (X509_NAME_hash_old(x->cert_info->subject)); 188 } 189 #endif 190 191 #ifndef OPENSSL_NO_SHA 192 /* Compare two certificates: they must be identical for 193 * this to work. NB: Although "cmp" operations are generally 194 * prototyped to take "const" arguments (eg. for use in 195 * STACKs), the way X509 handling is - these operations may 196 * involve ensuring the hashes are up-to-date and ensuring 197 * certain cert information is cached. So this is the point 198 * where the "depth-first" constification tree has to halt 199 * with an evil cast. 200 */ 201 int 202 X509_cmp(const X509 *a, const X509 *b) 203 { 204 /* ensure hash is valid */ 205 X509_check_purpose((X509 *)a, -1, 0); 206 X509_check_purpose((X509 *)b, -1, 0); 207 208 return memcmp(a->sha1_hash, b->sha1_hash, SHA_DIGEST_LENGTH); 209 } 210 #endif 211 212 int 213 X509_NAME_cmp(const X509_NAME *a, const X509_NAME *b) 214 { 215 int ret; 216 217 /* Ensure canonical encoding is present and up to date */ 218 if (!a->canon_enc || a->modified) { 219 ret = i2d_X509_NAME((X509_NAME *)a, NULL); 220 if (ret < 0) 221 return -2; 222 } 223 if (!b->canon_enc || b->modified) { 224 ret = i2d_X509_NAME((X509_NAME *)b, NULL); 225 if (ret < 0) 226 return -2; 227 } 228 ret = a->canon_enclen - b->canon_enclen; 229 if (ret) 230 return ret; 231 return memcmp(a->canon_enc, b->canon_enc, a->canon_enclen); 232 } 233 234 unsigned long 235 X509_NAME_hash(X509_NAME *x) 236 { 237 unsigned long ret = 0; 238 unsigned char md[SHA_DIGEST_LENGTH]; 239 240 /* Make sure X509_NAME structure contains valid cached encoding */ 241 i2d_X509_NAME(x, NULL); 242 if (!EVP_Digest(x->canon_enc, x->canon_enclen, md, NULL, EVP_sha1(), 243 NULL)) 244 return 0; 245 246 ret = (((unsigned long)md[0]) | ((unsigned long)md[1] << 8L) | 247 ((unsigned long)md[2] << 16L) | ((unsigned long)md[3] << 24L)) & 248 0xffffffffL; 249 return (ret); 250 } 251 252 253 #ifndef OPENSSL_NO_MD5 254 /* I now DER encode the name and hash it. Since I cache the DER encoding, 255 * this is reasonably efficient. */ 256 257 unsigned long 258 X509_NAME_hash_old(X509_NAME *x) 259 { 260 EVP_MD_CTX md_ctx; 261 unsigned long ret = 0; 262 unsigned char md[16]; 263 264 /* Make sure X509_NAME structure contains valid cached encoding */ 265 i2d_X509_NAME(x, NULL); 266 EVP_MD_CTX_init(&md_ctx); 267 if (EVP_DigestInit_ex(&md_ctx, EVP_md5(), NULL) && 268 EVP_DigestUpdate(&md_ctx, x->bytes->data, x->bytes->length) && 269 EVP_DigestFinal_ex(&md_ctx, md, NULL)) 270 ret = (((unsigned long)md[0]) | 271 ((unsigned long)md[1] << 8L) | 272 ((unsigned long)md[2] << 16L) | 273 ((unsigned long)md[3] << 24L)) & 274 0xffffffffL; 275 EVP_MD_CTX_cleanup(&md_ctx); 276 277 return (ret); 278 } 279 #endif 280 281 /* Search a stack of X509 for a match */ 282 X509 * 283 X509_find_by_issuer_and_serial(STACK_OF(X509) *sk, X509_NAME *name, 284 ASN1_INTEGER *serial) 285 { 286 int i; 287 X509_CINF cinf; 288 X509 x, *x509 = NULL; 289 290 if (!sk) 291 return NULL; 292 293 x.cert_info = &cinf; 294 cinf.serialNumber = serial; 295 cinf.issuer = name; 296 297 for (i = 0; i < sk_X509_num(sk); i++) { 298 x509 = sk_X509_value(sk, i); 299 if (X509_issuer_and_serial_cmp(x509, &x) == 0) 300 return (x509); 301 } 302 return (NULL); 303 } 304 305 X509 * 306 X509_find_by_subject(STACK_OF(X509) *sk, X509_NAME *name) 307 { 308 X509 *x509; 309 int i; 310 311 for (i = 0; i < sk_X509_num(sk); i++) { 312 x509 = sk_X509_value(sk, i); 313 if (X509_NAME_cmp(X509_get_subject_name(x509), name) == 0) 314 return (x509); 315 } 316 return (NULL); 317 } 318 319 EVP_PKEY * 320 X509_get_pubkey(X509 *x) 321 { 322 if ((x == NULL) || (x->cert_info == NULL)) 323 return (NULL); 324 return (X509_PUBKEY_get(x->cert_info->key)); 325 } 326 327 ASN1_BIT_STRING * 328 X509_get0_pubkey_bitstr(const X509 *x) 329 { 330 if (!x) 331 return NULL; 332 return x->cert_info->key->public_key; 333 } 334 335 int 336 X509_check_private_key(X509 *x, EVP_PKEY *k) 337 { 338 EVP_PKEY *xk; 339 int ret; 340 341 xk = X509_get_pubkey(x); 342 343 if (xk) 344 ret = EVP_PKEY_cmp(xk, k); 345 else 346 ret = -2; 347 348 switch (ret) { 349 case 1: 350 break; 351 case 0: 352 X509err(X509_F_X509_CHECK_PRIVATE_KEY, 353 X509_R_KEY_VALUES_MISMATCH); 354 break; 355 case -1: 356 X509err(X509_F_X509_CHECK_PRIVATE_KEY, 357 X509_R_KEY_TYPE_MISMATCH); 358 break; 359 case -2: 360 X509err(X509_F_X509_CHECK_PRIVATE_KEY, 361 X509_R_UNKNOWN_KEY_TYPE); 362 } 363 EVP_PKEY_free(xk); 364 if (ret > 0) 365 return 1; 366 return 0; 367 } 368