x_crl.c revision 296341
1/* crypto/asn1/x_crl.c */ 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 <stdio.h> 60#include "cryptlib.h" 61#include "asn1_locl.h" 62#include <openssl/asn1t.h> 63#include <openssl/x509.h> 64#include <openssl/x509v3.h> 65 66static int X509_REVOKED_cmp(const X509_REVOKED *const *a, 67 const X509_REVOKED *const *b); 68static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp); 69 70ASN1_SEQUENCE(X509_REVOKED) = { 71 ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER), 72 ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME), 73 ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION) 74} ASN1_SEQUENCE_END(X509_REVOKED) 75 76static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r); 77static int def_crl_lookup(X509_CRL *crl, 78 X509_REVOKED **ret, ASN1_INTEGER *serial, 79 X509_NAME *issuer); 80 81static X509_CRL_METHOD int_crl_meth = { 82 0, 83 0, 0, 84 def_crl_lookup, 85 def_crl_verify 86}; 87 88static const X509_CRL_METHOD *default_crl_method = &int_crl_meth; 89 90/* 91 * The X509_CRL_INFO structure needs a bit of customisation. Since we cache 92 * the original encoding the signature wont be affected by reordering of the 93 * revoked field. 94 */ 95static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 96 void *exarg) 97{ 98 X509_CRL_INFO *a = (X509_CRL_INFO *)*pval; 99 100 if (!a || !a->revoked) 101 return 1; 102 switch (operation) { 103 /* 104 * Just set cmp function here. We don't sort because that would 105 * affect the output of X509_CRL_print(). 106 */ 107 case ASN1_OP_D2I_POST: 108 (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp); 109 break; 110 } 111 return 1; 112} 113 114 115ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = { 116 ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER), 117 ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR), 118 ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME), 119 ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME), 120 ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME), 121 ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED), 122 ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0) 123} ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO) 124 125/* 126 * Set CRL entry issuer according to CRL certificate issuer extension. Check 127 * for unhandled critical CRL entry extensions. 128 */ 129 130static int crl_set_issuers(X509_CRL *crl) 131{ 132 133 int i, j; 134 GENERAL_NAMES *gens, *gtmp; 135 STACK_OF(X509_REVOKED) *revoked; 136 137 revoked = X509_CRL_get_REVOKED(crl); 138 139 gens = NULL; 140 for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) { 141 X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i); 142 STACK_OF(X509_EXTENSION) *exts; 143 ASN1_ENUMERATED *reason; 144 X509_EXTENSION *ext; 145 gtmp = X509_REVOKED_get_ext_d2i(rev, 146 NID_certificate_issuer, &j, NULL); 147 if (!gtmp && (j != -1)) { 148 crl->flags |= EXFLAG_INVALID; 149 return 1; 150 } 151 152 if (gtmp) { 153 gens = gtmp; 154 if (!crl->issuers) { 155 crl->issuers = sk_GENERAL_NAMES_new_null(); 156 if (!crl->issuers) 157 return 0; 158 } 159 if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp)) 160 return 0; 161 } 162 rev->issuer = gens; 163 164 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL); 165 if (!reason && (j != -1)) { 166 crl->flags |= EXFLAG_INVALID; 167 return 1; 168 } 169 170 if (reason) { 171 rev->reason = ASN1_ENUMERATED_get(reason); 172 ASN1_ENUMERATED_free(reason); 173 } else 174 rev->reason = CRL_REASON_NONE; 175 176 /* Check for critical CRL entry extensions */ 177 178 exts = rev->extensions; 179 180 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) { 181 ext = sk_X509_EXTENSION_value(exts, j); 182 if (ext->critical > 0) { 183 if (OBJ_obj2nid(ext->object) == NID_certificate_issuer) 184 continue; 185 crl->flags |= EXFLAG_CRITICAL; 186 break; 187 } 188 } 189 190 } 191 192 return 1; 193 194} 195 196/* 197 * The X509_CRL structure needs a bit of customisation. Cache some extensions 198 * and hash of the whole CRL. 199 */ 200static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 201 void *exarg) 202{ 203 X509_CRL *crl = (X509_CRL *)*pval; 204 STACK_OF(X509_EXTENSION) *exts; 205 X509_EXTENSION *ext; 206 int idx; 207 208 switch (operation) { 209 case ASN1_OP_NEW_POST: 210 crl->idp = NULL; 211 crl->akid = NULL; 212 crl->flags = 0; 213 crl->idp_flags = 0; 214 crl->idp_reasons = CRLDP_ALL_REASONS; 215 crl->meth = default_crl_method; 216 crl->meth_data = NULL; 217 crl->issuers = NULL; 218 crl->crl_number = NULL; 219 crl->base_crl_number = NULL; 220 break; 221 222 case ASN1_OP_D2I_POST: 223#ifndef OPENSSL_NO_SHA 224 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL); 225#endif 226 crl->idp = X509_CRL_get_ext_d2i(crl, 227 NID_issuing_distribution_point, NULL, 228 NULL); 229 if (crl->idp) 230 setup_idp(crl, crl->idp); 231 232 crl->akid = X509_CRL_get_ext_d2i(crl, 233 NID_authority_key_identifier, NULL, 234 NULL); 235 236 crl->crl_number = X509_CRL_get_ext_d2i(crl, 237 NID_crl_number, NULL, NULL); 238 239 crl->base_crl_number = X509_CRL_get_ext_d2i(crl, 240 NID_delta_crl, NULL, 241 NULL); 242 /* Delta CRLs must have CRL number */ 243 if (crl->base_crl_number && !crl->crl_number) 244 crl->flags |= EXFLAG_INVALID; 245 246 /* 247 * See if we have any unhandled critical CRL extensions and indicate 248 * this in a flag. We only currently handle IDP so anything else 249 * critical sets the flag. This code accesses the X509_CRL structure 250 * directly: applications shouldn't do this. 251 */ 252 253 exts = crl->crl->extensions; 254 255 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) { 256 int nid; 257 ext = sk_X509_EXTENSION_value(exts, idx); 258 nid = OBJ_obj2nid(ext->object); 259 if (nid == NID_freshest_crl) 260 crl->flags |= EXFLAG_FRESHEST; 261 if (ext->critical > 0) { 262 /* We handle IDP and deltas */ 263 if ((nid == NID_issuing_distribution_point) 264 || (nid == NID_authority_key_identifier) 265 || (nid == NID_delta_crl)) 266 break;; 267 crl->flags |= EXFLAG_CRITICAL; 268 break; 269 } 270 } 271 272 if (!crl_set_issuers(crl)) 273 return 0; 274 275 if (crl->meth->crl_init) { 276 if (crl->meth->crl_init(crl) == 0) 277 return 0; 278 } 279 break; 280 281 case ASN1_OP_FREE_POST: 282 if (crl->meth->crl_free) { 283 if (!crl->meth->crl_free(crl)) 284 return 0; 285 } 286 if (crl->akid) 287 AUTHORITY_KEYID_free(crl->akid); 288 if (crl->idp) 289 ISSUING_DIST_POINT_free(crl->idp); 290 ASN1_INTEGER_free(crl->crl_number); 291 ASN1_INTEGER_free(crl->base_crl_number); 292 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free); 293 break; 294 } 295 return 1; 296} 297 298/* Convert IDP into a more convenient form */ 299 300static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp) 301{ 302 int idp_only = 0; 303 /* Set various flags according to IDP */ 304 crl->idp_flags |= IDP_PRESENT; 305 if (idp->onlyuser > 0) { 306 idp_only++; 307 crl->idp_flags |= IDP_ONLYUSER; 308 } 309 if (idp->onlyCA > 0) { 310 idp_only++; 311 crl->idp_flags |= IDP_ONLYCA; 312 } 313 if (idp->onlyattr > 0) { 314 idp_only++; 315 crl->idp_flags |= IDP_ONLYATTR; 316 } 317 318 if (idp_only > 1) 319 crl->idp_flags |= IDP_INVALID; 320 321 if (idp->indirectCRL > 0) 322 crl->idp_flags |= IDP_INDIRECT; 323 324 if (idp->onlysomereasons) { 325 crl->idp_flags |= IDP_REASONS; 326 if (idp->onlysomereasons->length > 0) 327 crl->idp_reasons = idp->onlysomereasons->data[0]; 328 if (idp->onlysomereasons->length > 1) 329 crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8); 330 crl->idp_reasons &= CRLDP_ALL_REASONS; 331 } 332 333 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl)); 334} 335 336ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = { 337 ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO), 338 ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR), 339 ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING) 340} ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL) 341 342IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED) 343 344IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO) 345 346IMPLEMENT_ASN1_FUNCTIONS(X509_CRL) 347 348IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL) 349 350static int X509_REVOKED_cmp(const X509_REVOKED *const *a, 351 const X509_REVOKED *const *b) 352{ 353 return (ASN1_STRING_cmp((ASN1_STRING *)(*a)->serialNumber, 354 (ASN1_STRING *)(*b)->serialNumber)); 355} 356 357int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev) 358{ 359 X509_CRL_INFO *inf; 360 inf = crl->crl; 361 if (!inf->revoked) 362 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp); 363 if (!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) { 364 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE); 365 return 0; 366 } 367 inf->enc.modified = 1; 368 return 1; 369} 370 371int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r) 372{ 373 if (crl->meth->crl_verify) 374 return crl->meth->crl_verify(crl, r); 375 return 0; 376} 377 378int X509_CRL_get0_by_serial(X509_CRL *crl, 379 X509_REVOKED **ret, ASN1_INTEGER *serial) 380{ 381 if (crl->meth->crl_lookup) 382 return crl->meth->crl_lookup(crl, ret, serial, NULL); 383 return 0; 384} 385 386int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x) 387{ 388 if (crl->meth->crl_lookup) 389 return crl->meth->crl_lookup(crl, ret, 390 X509_get_serialNumber(x), 391 X509_get_issuer_name(x)); 392 return 0; 393} 394 395static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r) 396{ 397 return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO), 398 crl->sig_alg, crl->signature, crl->crl, r)); 399} 400 401static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm, 402 X509_REVOKED *rev) 403{ 404 int i; 405 406 if (!rev->issuer) { 407 if (!nm) 408 return 1; 409 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl))) 410 return 1; 411 return 0; 412 } 413 414 if (!nm) 415 nm = X509_CRL_get_issuer(crl); 416 417 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) { 418 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i); 419 if (gen->type != GEN_DIRNAME) 420 continue; 421 if (!X509_NAME_cmp(nm, gen->d.directoryName)) 422 return 1; 423 } 424 return 0; 425 426} 427 428static int def_crl_lookup(X509_CRL *crl, 429 X509_REVOKED **ret, ASN1_INTEGER *serial, 430 X509_NAME *issuer) 431{ 432 X509_REVOKED rtmp, *rev; 433 int idx; 434 rtmp.serialNumber = serial; 435 /* 436 * Sort revoked into serial number order if not already sorted. Do this 437 * under a lock to avoid race condition. 438 */ 439 if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) { 440 CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL); 441 sk_X509_REVOKED_sort(crl->crl->revoked); 442 CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL); 443 } 444 idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp); 445 if (idx < 0) 446 return 0; 447 /* Need to look for matching name */ 448 for (; idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) { 449 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx); 450 if (ASN1_INTEGER_cmp(rev->serialNumber, serial)) 451 return 0; 452 if (crl_revoked_issuer_match(crl, issuer, rev)) { 453 if (ret) 454 *ret = rev; 455 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL) 456 return 2; 457 return 1; 458 } 459 } 460 return 0; 461} 462 463void X509_CRL_set_default_method(const X509_CRL_METHOD *meth) 464{ 465 if (meth == NULL) 466 default_crl_method = &int_crl_meth; 467 else 468 default_crl_method = meth; 469} 470 471X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl), 472 int (*crl_free) (X509_CRL *crl), 473 int (*crl_lookup) (X509_CRL *crl, 474 X509_REVOKED **ret, 475 ASN1_INTEGER *ser, 476 X509_NAME *issuer), 477 int (*crl_verify) (X509_CRL *crl, 478 EVP_PKEY *pk)) 479{ 480 X509_CRL_METHOD *m; 481 m = OPENSSL_malloc(sizeof(X509_CRL_METHOD)); 482 if (!m) 483 return NULL; 484 m->crl_init = crl_init; 485 m->crl_free = crl_free; 486 m->crl_lookup = crl_lookup; 487 m->crl_verify = crl_verify; 488 m->flags = X509_CRL_METHOD_DYNAMIC; 489 return m; 490} 491 492void X509_CRL_METHOD_free(X509_CRL_METHOD *m) 493{ 494 if (!(m->flags & X509_CRL_METHOD_DYNAMIC)) 495 return; 496 OPENSSL_free(m); 497} 498 499void X509_CRL_set_meth_data(X509_CRL *crl, void *dat) 500{ 501 crl->meth_data = dat; 502} 503 504void *X509_CRL_get_meth_data(X509_CRL *crl) 505{ 506 return crl->meth_data; 507} 508 509IMPLEMENT_STACK_OF(X509_REVOKED) 510 511IMPLEMENT_ASN1_SET_OF(X509_REVOKED) 512 513IMPLEMENT_STACK_OF(X509_CRL) 514 515IMPLEMENT_ASN1_SET_OF(X509_CRL) 516