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_authority_key_identifier) 274 || (nid == NID_delta_crl)) 275 break;; 276 crl->flags |= EXFLAG_CRITICAL; 277 break; 278 } 279 } 280 281 282 if (!crl_set_issuers(crl)) 283 return 0; 284 285 if (crl->meth->crl_init) 286 { 287 if (crl->meth->crl_init(crl) == 0) 288 return 0; 289 } 290 break; 291 292 case ASN1_OP_FREE_POST: 293 if (crl->meth->crl_free) 294 { 295 if (!crl->meth->crl_free(crl)) 296 return 0; 297 } 298 if (crl->akid) 299 AUTHORITY_KEYID_free(crl->akid); 300 if (crl->idp) 301 ISSUING_DIST_POINT_free(crl->idp); 302 ASN1_INTEGER_free(crl->crl_number); 303 ASN1_INTEGER_free(crl->base_crl_number); 304 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free); 305 break; 306 } 307 return 1; 308 } 309 310 /* Convert IDP into a more convenient form */ 311 312 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp) 313 { 314 int idp_only = 0; 315 /* Set various flags according to IDP */ 316 crl->idp_flags |= IDP_PRESENT; 317 if (idp->onlyuser > 0) 318 { 319 idp_only++; 320 crl->idp_flags |= IDP_ONLYUSER; 321 } 322 if (idp->onlyCA > 0) 323 { 324 idp_only++; 325 crl->idp_flags |= IDP_ONLYCA; 326 } 327 if (idp->onlyattr > 0) 328 { 329 idp_only++; 330 crl->idp_flags |= IDP_ONLYATTR; 331 } 332 333 if (idp_only > 1) 334 crl->idp_flags |= IDP_INVALID; 335 336 if (idp->indirectCRL > 0) 337 crl->idp_flags |= IDP_INDIRECT; 338 339 if (idp->onlysomereasons) 340 { 341 crl->idp_flags |= IDP_REASONS; 342 if (idp->onlysomereasons->length > 0) 343 crl->idp_reasons = idp->onlysomereasons->data[0]; 344 if (idp->onlysomereasons->length > 1) 345 crl->idp_reasons |= 346 (idp->onlysomereasons->data[1] << 8); 347 crl->idp_reasons &= CRLDP_ALL_REASONS; 348 } 349 350 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl)); 351 } 352 353 ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = { 354 ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO), 355 ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR), 356 ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING) 357 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL) 358 359 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED) 360 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO) 361 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL) 362 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL) 363 364 static int X509_REVOKED_cmp(const X509_REVOKED * const *a, 365 const X509_REVOKED * const *b) 366 { 367 return(ASN1_STRING_cmp( 368 (ASN1_STRING *)(*a)->serialNumber, 369 (ASN1_STRING *)(*b)->serialNumber)); 370 } 371 372 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev) 373 { 374 X509_CRL_INFO *inf; 375 inf = crl->crl; 376 if(!inf->revoked) 377 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp); 378 if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) { 379 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE); 380 return 0; 381 } 382 inf->enc.modified = 1; 383 return 1; 384 } 385 386 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r) 387 { 388 if (crl->meth->crl_verify) 389 return crl->meth->crl_verify(crl, r); 390 return 0; 391 } 392 393 int X509_CRL_get0_by_serial(X509_CRL *crl, 394 X509_REVOKED **ret, ASN1_INTEGER *serial) 395 { 396 if (crl->meth->crl_lookup) 397 return crl->meth->crl_lookup(crl, ret, serial, NULL); 398 return 0; 399 } 400 401 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x) 402 { 403 if (crl->meth->crl_lookup) 404 return crl->meth->crl_lookup(crl, ret, 405 X509_get_serialNumber(x), 406 X509_get_issuer_name(x)); 407 return 0; 408 } 409 410 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r) 411 { 412 return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO), 413 crl->sig_alg, crl->signature,crl->crl,r)); 414 } 415 416 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm, 417 X509_REVOKED *rev) 418 { 419 int i; 420 421 if (!rev->issuer) 422 { 423 if (!nm) 424 return 1; 425 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl))) 426 return 1; 427 return 0; 428 } 429 430 if (!nm) 431 nm = X509_CRL_get_issuer(crl); 432 433 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) 434 { 435 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i); 436 if (gen->type != GEN_DIRNAME) 437 continue; 438 if (!X509_NAME_cmp(nm, gen->d.directoryName)) 439 return 1; 440 } 441 return 0; 442 443 } 444 445 static int def_crl_lookup(X509_CRL *crl, 446 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer) 447 { 448 X509_REVOKED rtmp, *rev; 449 int idx; 450 rtmp.serialNumber = serial; 451 /* Sort revoked into serial number order if not already sorted. 452 * Do this under a lock to avoid race condition. 453 */ 454 if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) 455 { 456 CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL); 457 sk_X509_REVOKED_sort(crl->crl->revoked); 458 CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL); 459 } 460 idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp); 461 if(idx < 0) 462 return 0; 463 /* Need to look for matching name */ 464 for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) 465 { 466 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx); 467 if (ASN1_INTEGER_cmp(rev->serialNumber, serial)) 468 return 0; 469 if (crl_revoked_issuer_match(crl, issuer, rev)) 470 { 471 if (ret) 472 *ret = rev; 473 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL) 474 return 2; 475 return 1; 476 } 477 } 478 return 0; 479 } 480 481 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth) 482 { 483 if (meth == NULL) 484 default_crl_method = &int_crl_meth; 485 else 486 default_crl_method = meth; 487 } 488 489 X509_CRL_METHOD *X509_CRL_METHOD_new( 490 int (*crl_init)(X509_CRL *crl), 491 int (*crl_free)(X509_CRL *crl), 492 int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret, 493 ASN1_INTEGER *ser, X509_NAME *issuer), 494 int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk)) 495 { 496 X509_CRL_METHOD *m; 497 m = OPENSSL_malloc(sizeof(X509_CRL_METHOD)); 498 if (!m) 499 return NULL; 500 m->crl_init = crl_init; 501 m->crl_free = crl_free; 502 m->crl_lookup = crl_lookup; 503 m->crl_verify = crl_verify; 504 m->flags = X509_CRL_METHOD_DYNAMIC; 505 return m; 506 } 507 508 void X509_CRL_METHOD_free(X509_CRL_METHOD *m) 509 { 510 if (!(m->flags & X509_CRL_METHOD_DYNAMIC)) 511 return; 512 OPENSSL_free(m); 513 } 514 515 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat) 516 { 517 crl->meth_data = dat; 518 } 519 520 void *X509_CRL_get_meth_data(X509_CRL *crl) 521 { 522 return crl->meth_data; 523 } 524 525 IMPLEMENT_STACK_OF(X509_REVOKED) 526 IMPLEMENT_ASN1_SET_OF(X509_REVOKED) 527 IMPLEMENT_STACK_OF(X509_CRL) 528 IMPLEMENT_ASN1_SET_OF(X509_CRL) 529
