1 /* crypto/asn1/x_crl.c */ 2 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 3 * All rights reserved. 4 * 5 * This package is an SSL implementation written 6 * by Eric Young (eay (at) 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 (at) 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 (at) 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 (at) 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 66 static int X509_REVOKED_cmp(const X509_REVOKED * const *a, 67 const X509_REVOKED * const *b); 68 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp); 69 70 ASN1_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 76 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r); 77 static int def_crl_lookup(X509_CRL *crl, 78 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer); 79 80 static X509_CRL_METHOD int_crl_meth = 81 { 82 0, 83 0,0, 84 def_crl_lookup, 85 def_crl_verify 86 }; 87 88 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth; 89 90 /* The X509_CRL_INFO structure needs a bit of customisation. 91 * Since we cache the original encoding the signature wont be affected by 92 * reordering of the revoked field. 93 */ 94 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 95 void *exarg) 96 { 97 X509_CRL_INFO *a = (X509_CRL_INFO *)*pval; 98 99 if(!a || !a->revoked) return 1; 100 switch(operation) { 101 /* Just set cmp function here. We don't sort because that 102 * would affect the output of X509_CRL_print(). 103 */ 104 case ASN1_OP_D2I_POST: 105 (void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp); 106 break; 107 } 108 return 1; 109 } 110 111 112 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = { 113 ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER), 114 ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR), 115 ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME), 116 ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME), 117 ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME), 118 ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED), 119 ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0) 120 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO) 121 122 /* Set CRL entry issuer according to CRL certificate issuer extension. 123 * Check for unhandled critical CRL entry extensions. 124 */ 125 126 static int crl_set_issuers(X509_CRL *crl) 127 { 128 129 int i, j; 130 GENERAL_NAMES *gens, *gtmp; 131 STACK_OF(X509_REVOKED) *revoked; 132 133 revoked = X509_CRL_get_REVOKED(crl); 134 135 gens = NULL; 136 for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) 137 { 138 X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i); 139 STACK_OF(X509_EXTENSION) *exts; 140 ASN1_ENUMERATED *reason; 141 X509_EXTENSION *ext; 142 gtmp = X509_REVOKED_get_ext_d2i(rev, 143 NID_certificate_issuer, 144 &j, NULL); 145 if (!gtmp && (j != -1)) 146 { 147 crl->flags |= EXFLAG_INVALID; 148 return 1; 149 } 150 151 if (gtmp) 152 { 153 gens = gtmp; 154 if (!crl->issuers) 155 { 156 crl->issuers = sk_GENERAL_NAMES_new_null(); 157 if (!crl->issuers) 158 return 0; 159 } 160 if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp)) 161 return 0; 162 } 163 rev->issuer = gens; 164 165 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, 166 &j, NULL); 167 if (!reason && (j != -1)) 168 { 169 crl->flags |= EXFLAG_INVALID; 170 return 1; 171 } 172 173 if (reason) 174 { 175 rev->reason = ASN1_ENUMERATED_get(reason); 176 ASN1_ENUMERATED_free(reason); 177 } 178 else 179 rev->reason = CRL_REASON_NONE; 180 181 /* Check for critical CRL entry extensions */ 182 183 exts = rev->extensions; 184 185 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) 186 { 187 ext = sk_X509_EXTENSION_value(exts, j); 188 if (ext->critical > 0) 189 { 190 if (OBJ_obj2nid(ext->object) == 191 NID_certificate_issuer) 192 continue; 193 crl->flags |= EXFLAG_CRITICAL; 194 break; 195 } 196 } 197 198 199 } 200 201 return 1; 202 203 } 204 205 /* The X509_CRL structure needs a bit of customisation. Cache some extensions 206 * and hash of the whole CRL. 207 */ 208 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 209 void *exarg) 210 { 211 X509_CRL *crl = (X509_CRL *)*pval; 212 STACK_OF(X509_EXTENSION) *exts; 213 X509_EXTENSION *ext; 214 int idx; 215 216 switch(operation) 217 { 218 case ASN1_OP_NEW_POST: 219 crl->idp = NULL; 220 crl->akid = NULL; 221 crl->flags = 0; 222 crl->idp_flags = 0; 223 crl->idp_reasons = CRLDP_ALL_REASONS; 224 crl->meth = default_crl_method; 225 crl->meth_data = NULL; 226 crl->issuers = NULL; 227 crl->crl_number = NULL; 228 crl->base_crl_number = NULL; 229 break; 230 231 case ASN1_OP_D2I_POST: 232 #ifndef OPENSSL_NO_SHA 233 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL); 234 #endif 235 crl->idp = X509_CRL_get_ext_d2i(crl, 236 NID_issuing_distribution_point, NULL, NULL); 237 if (crl->idp) 238 setup_idp(crl, crl->idp); 239 240 crl->akid = X509_CRL_get_ext_d2i(crl, 241 NID_authority_key_identifier, NULL, NULL); 242 243 crl->crl_number = X509_CRL_get_ext_d2i(crl, 244 NID_crl_number, NULL, NULL); 245 246 crl->base_crl_number = X509_CRL_get_ext_d2i(crl, 247 NID_delta_crl, NULL, NULL); 248 /* Delta CRLs must have CRL number */ 249 if (crl->base_crl_number && !crl->crl_number) 250 crl->flags |= EXFLAG_INVALID; 251 252 /* See if we have any unhandled critical CRL extensions and 253 * indicate this in a flag. We only currently handle IDP so 254 * anything else critical sets the flag. 255 * 256 * This code accesses the X509_CRL structure directly: 257 * applications shouldn't do this. 258 */ 259 260 exts = crl->crl->extensions; 261 262 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) 263 { 264 int nid; 265 ext = sk_X509_EXTENSION_value(exts, idx); 266 nid = OBJ_obj2nid(ext->object); 267 if (nid == NID_freshest_crl) 268 crl->flags |= EXFLAG_FRESHEST; 269 if (ext->critical > 0) 270 { 271 /* We handle IDP and deltas */ 272 if ((nid == NID_issuing_distribution_point) 273 || (nid == NID_delta_crl)) 274 break;; 275 crl->flags |= EXFLAG_CRITICAL; 276 break; 277 } 278 } 279 280 281 if (!crl_set_issuers(crl)) 282 return 0; 283 284 if (crl->meth->crl_init) 285 { 286 if (crl->meth->crl_init(crl) == 0) 287 return 0; 288 } 289 break; 290 291 case ASN1_OP_FREE_POST: 292 if (crl->meth->crl_free) 293 { 294 if (!crl->meth->crl_free(crl)) 295 return 0; 296 } 297 if (crl->akid) 298 AUTHORITY_KEYID_free(crl->akid); 299 if (crl->idp) 300 ISSUING_DIST_POINT_free(crl->idp); 301 ASN1_INTEGER_free(crl->crl_number); 302 ASN1_INTEGER_free(crl->base_crl_number); 303 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free); 304 break; 305 } 306 return 1; 307 } 308 309 /* Convert IDP into a more convenient form */ 310 311 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp) 312 { 313 int idp_only = 0; 314 /* Set various flags according to IDP */ 315 crl->idp_flags |= IDP_PRESENT; 316 if (idp->onlyuser > 0) 317 { 318 idp_only++; 319 crl->idp_flags |= IDP_ONLYUSER; 320 } 321 if (idp->onlyCA > 0) 322 { 323 idp_only++; 324 crl->idp_flags |= IDP_ONLYCA; 325 } 326 if (idp->onlyattr > 0) 327 { 328 idp_only++; 329 crl->idp_flags |= IDP_ONLYATTR; 330 } 331 332 if (idp_only > 1) 333 crl->idp_flags |= IDP_INVALID; 334 335 if (idp->indirectCRL > 0) 336 crl->idp_flags |= IDP_INDIRECT; 337 338 if (idp->onlysomereasons) 339 { 340 crl->idp_flags |= IDP_REASONS; 341 if (idp->onlysomereasons->length > 0) 342 crl->idp_reasons = idp->onlysomereasons->data[0]; 343 if (idp->onlysomereasons->length > 1) 344 crl->idp_reasons |= 345 (idp->onlysomereasons->data[1] << 8); 346 crl->idp_reasons &= CRLDP_ALL_REASONS; 347 } 348 349 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl)); 350 } 351 352 ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = { 353 ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO), 354 ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR), 355 ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING) 356 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL) 357 358 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED) 359 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO) 360 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL) 361 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL) 362 363 static int X509_REVOKED_cmp(const X509_REVOKED * const *a, 364 const X509_REVOKED * const *b) 365 { 366 return(ASN1_STRING_cmp( 367 (ASN1_STRING *)(*a)->serialNumber, 368 (ASN1_STRING *)(*b)->serialNumber)); 369 } 370 371 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev) 372 { 373 X509_CRL_INFO *inf; 374 inf = crl->crl; 375 if(!inf->revoked) 376 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp); 377 if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) { 378 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE); 379 return 0; 380 } 381 inf->enc.modified = 1; 382 return 1; 383 } 384 385 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r) 386 { 387 if (crl->meth->crl_verify) 388 return crl->meth->crl_verify(crl, r); 389 return 0; 390 } 391 392 int X509_CRL_get0_by_serial(X509_CRL *crl, 393 X509_REVOKED **ret, ASN1_INTEGER *serial) 394 { 395 if (crl->meth->crl_lookup) 396 return crl->meth->crl_lookup(crl, ret, serial, NULL); 397 return 0; 398 } 399 400 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x) 401 { 402 if (crl->meth->crl_lookup) 403 return crl->meth->crl_lookup(crl, ret, 404 X509_get_serialNumber(x), 405 X509_get_issuer_name(x)); 406 return 0; 407 } 408 409 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r) 410 { 411 return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO), 412 crl->sig_alg, crl->signature,crl->crl,r)); 413 } 414 415 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm, 416 X509_REVOKED *rev) 417 { 418 int i; 419 420 if (!rev->issuer) 421 { 422 if (!nm) 423 return 1; 424 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl))) 425 return 1; 426 return 0; 427 } 428 429 if (!nm) 430 nm = X509_CRL_get_issuer(crl); 431 432 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) 433 { 434 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i); 435 if (gen->type != GEN_DIRNAME) 436 continue; 437 if (!X509_NAME_cmp(nm, gen->d.directoryName)) 438 return 1; 439 } 440 return 0; 441 442 } 443 444 static int def_crl_lookup(X509_CRL *crl, 445 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer) 446 { 447 X509_REVOKED rtmp, *rev; 448 int idx; 449 rtmp.serialNumber = serial; 450 /* Sort revoked into serial number order if not already sorted. 451 * Do this under a lock to avoid race condition. 452 */ 453 if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) 454 { 455 CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL); 456 sk_X509_REVOKED_sort(crl->crl->revoked); 457 CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL); 458 } 459 idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp); 460 if(idx < 0) 461 return 0; 462 /* Need to look for matching name */ 463 for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) 464 { 465 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx); 466 if (ASN1_INTEGER_cmp(rev->serialNumber, serial)) 467 return 0; 468 if (crl_revoked_issuer_match(crl, issuer, rev)) 469 { 470 if (ret) 471 *ret = rev; 472 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL) 473 return 2; 474 return 1; 475 } 476 } 477 return 0; 478 } 479 480 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth) 481 { 482 if (meth == NULL) 483 default_crl_method = &int_crl_meth; 484 else 485 default_crl_method = meth; 486 } 487 488 X509_CRL_METHOD *X509_CRL_METHOD_new( 489 int (*crl_init)(X509_CRL *crl), 490 int (*crl_free)(X509_CRL *crl), 491 int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret, 492 ASN1_INTEGER *ser, X509_NAME *issuer), 493 int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk)) 494 { 495 X509_CRL_METHOD *m; 496 m = OPENSSL_malloc(sizeof(X509_CRL_METHOD)); 497 if (!m) 498 return NULL; 499 m->crl_init = crl_init; 500 m->crl_free = crl_free; 501 m->crl_lookup = crl_lookup; 502 m->crl_verify = crl_verify; 503 m->flags = X509_CRL_METHOD_DYNAMIC; 504 return m; 505 } 506 507 void X509_CRL_METHOD_free(X509_CRL_METHOD *m) 508 { 509 if (!(m->flags & X509_CRL_METHOD_DYNAMIC)) 510 return; 511 OPENSSL_free(m); 512 } 513 514 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat) 515 { 516 crl->meth_data = dat; 517 } 518 519 void *X509_CRL_get_meth_data(X509_CRL *crl) 520 { 521 return crl->meth_data; 522 } 523 524 IMPLEMENT_STACK_OF(X509_REVOKED) 525 IMPLEMENT_ASN1_SET_OF(X509_REVOKED) 526 IMPLEMENT_STACK_OF(X509_CRL) 527 IMPLEMENT_ASN1_SET_OF(X509_CRL) 528
