1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/asn1.h> 58 #include <openssl/asn1t.h> 59 #include <openssl/digest.h> 60 #include <openssl/err.h> 61 #include <openssl/mem.h> 62 #include <openssl/obj.h> 63 #include <openssl/stack.h> 64 #include <openssl/thread.h> 65 #include <openssl/x509.h> 66 #include <openssl/x509v3.h> 67 68 #include "../internal.h" 69 70 71 /* Method to handle CRL access. 72 * In general a CRL could be very large (several Mb) and can consume large 73 * amounts of resources if stored in memory by multiple processes. 74 * This method allows general CRL operations to be redirected to more 75 * efficient callbacks: for example a CRL entry database. 76 */ 77 78 #define X509_CRL_METHOD_DYNAMIC 1 79 80 struct x509_crl_method_st 81 { 82 int flags; 83 int (*crl_init)(X509_CRL *crl); 84 int (*crl_free)(X509_CRL *crl); 85 int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret, 86 ASN1_INTEGER *ser, X509_NAME *issuer); 87 int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk); 88 }; 89 90 static int X509_REVOKED_cmp(const X509_REVOKED **a, 91 const X509_REVOKED **b); 92 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp); 93 94 ASN1_SEQUENCE(X509_REVOKED) = { 95 ASN1_SIMPLE(X509_REVOKED,serialNumber, ASN1_INTEGER), 96 ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME), 97 ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION) 98 } ASN1_SEQUENCE_END(X509_REVOKED) 99 100 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r); 101 static int def_crl_lookup(X509_CRL *crl, 102 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer); 103 104 static const X509_CRL_METHOD int_crl_meth = 105 { 106 0, 107 0,0, 108 def_crl_lookup, 109 def_crl_verify 110 }; 111 112 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth; 113 114 /* The X509_CRL_INFO structure needs a bit of customisation. 115 * Since we cache the original encoding the signature wont be affected by 116 * reordering of the revoked field. 117 */ 118 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 119 void *exarg) 120 { 121 X509_CRL_INFO *a = (X509_CRL_INFO *)*pval; 122 123 if(!a || !a->revoked) return 1; 124 switch(operation) { 125 /* Just set cmp function here. We don't sort because that 126 * would affect the output of X509_CRL_print(). 127 */ 128 case ASN1_OP_D2I_POST: 129 (void)sk_X509_REVOKED_set_cmp_func(a->revoked,X509_REVOKED_cmp); 130 break; 131 } 132 return 1; 133 } 134 135 136 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = { 137 ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER), 138 ASN1_SIMPLE(X509_CRL_INFO, sig_alg, X509_ALGOR), 139 ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME), 140 ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME), 141 ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME), 142 ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED), 143 ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0) 144 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO) 145 146 /* Set CRL entry issuer according to CRL certificate issuer extension. 147 * Check for unhandled critical CRL entry extensions. 148 */ 149 150 static int crl_set_issuers(X509_CRL *crl) 151 { 152 153 size_t i, k; 154 int j; 155 GENERAL_NAMES *gens, *gtmp; 156 STACK_OF(X509_REVOKED) *revoked; 157 158 revoked = X509_CRL_get_REVOKED(crl); 159 160 gens = NULL; 161 for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) 162 { 163 X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i); 164 STACK_OF(X509_EXTENSION) *exts; 165 ASN1_ENUMERATED *reason; 166 X509_EXTENSION *ext; 167 gtmp = X509_REVOKED_get_ext_d2i(rev, 168 NID_certificate_issuer, 169 &j, NULL); 170 if (!gtmp && (j != -1)) 171 { 172 crl->flags |= EXFLAG_INVALID; 173 return 1; 174 } 175 176 if (gtmp) 177 { 178 gens = gtmp; 179 if (!crl->issuers) 180 { 181 crl->issuers = sk_GENERAL_NAMES_new_null(); 182 if (!crl->issuers) 183 return 0; 184 } 185 if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp)) 186 return 0; 187 } 188 rev->issuer = gens; 189 190 reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, 191 &j, NULL); 192 if (!reason && (j != -1)) 193 { 194 crl->flags |= EXFLAG_INVALID; 195 return 1; 196 } 197 198 if (reason) 199 { 200 rev->reason = ASN1_ENUMERATED_get(reason); 201 ASN1_ENUMERATED_free(reason); 202 } 203 else 204 rev->reason = CRL_REASON_NONE; 205 206 /* Check for critical CRL entry extensions */ 207 208 exts = rev->extensions; 209 210 for (k = 0; k < sk_X509_EXTENSION_num(exts); k++) 211 { 212 ext = sk_X509_EXTENSION_value(exts, k); 213 if (ext->critical > 0) 214 { 215 if (OBJ_obj2nid(ext->object) == 216 NID_certificate_issuer) 217 continue; 218 crl->flags |= EXFLAG_CRITICAL; 219 break; 220 } 221 } 222 223 224 } 225 226 return 1; 227 228 } 229 230 /* The X509_CRL structure needs a bit of customisation. Cache some extensions 231 * and hash of the whole CRL. 232 */ 233 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, 234 void *exarg) 235 { 236 X509_CRL *crl = (X509_CRL *)*pval; 237 STACK_OF(X509_EXTENSION) *exts; 238 X509_EXTENSION *ext; 239 size_t idx; 240 241 switch(operation) 242 { 243 case ASN1_OP_NEW_POST: 244 crl->idp = NULL; 245 crl->akid = NULL; 246 crl->flags = 0; 247 crl->idp_flags = 0; 248 crl->idp_reasons = CRLDP_ALL_REASONS; 249 crl->meth = default_crl_method; 250 crl->meth_data = NULL; 251 crl->issuers = NULL; 252 crl->crl_number = NULL; 253 crl->base_crl_number = NULL; 254 break; 255 256 case ASN1_OP_D2I_POST: 257 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL); 258 crl->idp = X509_CRL_get_ext_d2i(crl, 259 NID_issuing_distribution_point, NULL, NULL); 260 if (crl->idp) 261 setup_idp(crl, crl->idp); 262 263 crl->akid = X509_CRL_get_ext_d2i(crl, 264 NID_authority_key_identifier, NULL, NULL); 265 266 crl->crl_number = X509_CRL_get_ext_d2i(crl, 267 NID_crl_number, NULL, NULL); 268 269 crl->base_crl_number = X509_CRL_get_ext_d2i(crl, 270 NID_delta_crl, NULL, NULL); 271 /* Delta CRLs must have CRL number */ 272 if (crl->base_crl_number && !crl->crl_number) 273 crl->flags |= EXFLAG_INVALID; 274 275 /* See if we have any unhandled critical CRL extensions and 276 * indicate this in a flag. We only currently handle IDP so 277 * anything else critical sets the flag. 278 * 279 * This code accesses the X509_CRL structure directly: 280 * applications shouldn't do this. 281 */ 282 283 exts = crl->crl->extensions; 284 285 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) 286 { 287 int nid; 288 ext = sk_X509_EXTENSION_value(exts, idx); 289 nid = OBJ_obj2nid(ext->object); 290 if (nid == NID_freshest_crl) 291 crl->flags |= EXFLAG_FRESHEST; 292 if (ext->critical > 0) 293 { 294 /* We handle IDP and deltas */ 295 if ((nid == NID_issuing_distribution_point) 296 || (nid == NID_authority_key_identifier) 297 || (nid == NID_delta_crl)) 298 break;; 299 crl->flags |= EXFLAG_CRITICAL; 300 break; 301 } 302 } 303 304 305 if (!crl_set_issuers(crl)) 306 return 0; 307 308 if (crl->meth->crl_init) 309 { 310 if (crl->meth->crl_init(crl) == 0) 311 return 0; 312 } 313 break; 314 315 case ASN1_OP_FREE_POST: 316 if (crl->meth->crl_free) 317 { 318 if (!crl->meth->crl_free(crl)) 319 return 0; 320 } 321 if (crl->akid) 322 AUTHORITY_KEYID_free(crl->akid); 323 if (crl->idp) 324 ISSUING_DIST_POINT_free(crl->idp); 325 ASN1_INTEGER_free(crl->crl_number); 326 ASN1_INTEGER_free(crl->base_crl_number); 327 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free); 328 break; 329 } 330 return 1; 331 } 332 333 /* Convert IDP into a more convenient form */ 334 335 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp) 336 { 337 int idp_only = 0; 338 /* Set various flags according to IDP */ 339 crl->idp_flags |= IDP_PRESENT; 340 if (idp->onlyuser > 0) 341 { 342 idp_only++; 343 crl->idp_flags |= IDP_ONLYUSER; 344 } 345 if (idp->onlyCA > 0) 346 { 347 idp_only++; 348 crl->idp_flags |= IDP_ONLYCA; 349 } 350 if (idp->onlyattr > 0) 351 { 352 idp_only++; 353 crl->idp_flags |= IDP_ONLYATTR; 354 } 355 356 if (idp_only > 1) 357 crl->idp_flags |= IDP_INVALID; 358 359 if (idp->indirectCRL > 0) 360 crl->idp_flags |= IDP_INDIRECT; 361 362 if (idp->onlysomereasons) 363 { 364 crl->idp_flags |= IDP_REASONS; 365 if (idp->onlysomereasons->length > 0) 366 crl->idp_reasons = idp->onlysomereasons->data[0]; 367 if (idp->onlysomereasons->length > 1) 368 crl->idp_reasons |= 369 (idp->onlysomereasons->data[1] << 8); 370 crl->idp_reasons &= CRLDP_ALL_REASONS; 371 } 372 373 DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl)); 374 } 375 376 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = { 377 ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO), 378 ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR), 379 ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING) 380 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL) 381 382 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED) 383 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED) 384 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO) 385 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL) 386 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL) 387 388 static int X509_REVOKED_cmp(const X509_REVOKED **a, 389 const X509_REVOKED **b) 390 { 391 return(ASN1_STRING_cmp( 392 (ASN1_STRING *)(*a)->serialNumber, 393 (ASN1_STRING *)(*b)->serialNumber)); 394 } 395 396 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev) 397 { 398 X509_CRL_INFO *inf; 399 inf = crl->crl; 400 if(!inf->revoked) 401 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp); 402 if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) { 403 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE); 404 return 0; 405 } 406 inf->enc.modified = 1; 407 return 1; 408 } 409 410 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r) 411 { 412 if (crl->meth->crl_verify) 413 return crl->meth->crl_verify(crl, r); 414 return 0; 415 } 416 417 int X509_CRL_get0_by_serial(X509_CRL *crl, 418 X509_REVOKED **ret, ASN1_INTEGER *serial) 419 { 420 if (crl->meth->crl_lookup) 421 return crl->meth->crl_lookup(crl, ret, serial, NULL); 422 return 0; 423 } 424 425 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x) 426 { 427 if (crl->meth->crl_lookup) 428 return crl->meth->crl_lookup(crl, ret, 429 X509_get_serialNumber(x), 430 X509_get_issuer_name(x)); 431 return 0; 432 } 433 434 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r) 435 { 436 return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO), 437 crl->sig_alg, crl->signature,crl->crl,r)); 438 } 439 440 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm, 441 X509_REVOKED *rev) 442 { 443 size_t i; 444 445 if (!rev->issuer) 446 { 447 if (!nm) 448 return 1; 449 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl))) 450 return 1; 451 return 0; 452 } 453 454 if (!nm) 455 nm = X509_CRL_get_issuer(crl); 456 457 for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) 458 { 459 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i); 460 if (gen->type != GEN_DIRNAME) 461 continue; 462 if (!X509_NAME_cmp(nm, gen->d.directoryName)) 463 return 1; 464 } 465 return 0; 466 467 } 468 469 static struct CRYPTO_STATIC_MUTEX g_crl_sort_lock = CRYPTO_STATIC_MUTEX_INIT; 470 471 static int def_crl_lookup(X509_CRL *crl, 472 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer) 473 { 474 X509_REVOKED rtmp, *rev; 475 size_t idx; 476 rtmp.serialNumber = serial; 477 /* Sort revoked into serial number order if not already sorted. 478 * Do this under a lock to avoid race condition. 479 */ 480 481 CRYPTO_STATIC_MUTEX_lock_read(&g_crl_sort_lock); 482 const int is_sorted = sk_X509_REVOKED_is_sorted(crl->crl->revoked); 483 CRYPTO_STATIC_MUTEX_unlock(&g_crl_sort_lock); 484 485 if (!is_sorted) 486 { 487 CRYPTO_STATIC_MUTEX_lock_write(&g_crl_sort_lock); 488 if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked)) 489 { 490 sk_X509_REVOKED_sort(crl->crl->revoked); 491 } 492 CRYPTO_STATIC_MUTEX_unlock(&g_crl_sort_lock); 493 } 494 495 if (!sk_X509_REVOKED_find(crl->crl->revoked, &idx, &rtmp)) 496 return 0; 497 /* Need to look for matching name */ 498 for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++) 499 { 500 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx); 501 if (ASN1_INTEGER_cmp(rev->serialNumber, serial)) 502 return 0; 503 if (crl_revoked_issuer_match(crl, issuer, rev)) 504 { 505 if (ret) 506 *ret = rev; 507 if (rev->reason == CRL_REASON_REMOVE_FROM_CRL) 508 return 2; 509 return 1; 510 } 511 } 512 return 0; 513 } 514 515 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth) 516 { 517 if (meth == NULL) 518 default_crl_method = &int_crl_meth; 519 else 520 default_crl_method = meth; 521 } 522 523 X509_CRL_METHOD *X509_CRL_METHOD_new( 524 int (*crl_init)(X509_CRL *crl), 525 int (*crl_free)(X509_CRL *crl), 526 int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret, 527 ASN1_INTEGER *ser, X509_NAME *issuer), 528 int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk)) 529 { 530 X509_CRL_METHOD *m; 531 m = OPENSSL_malloc(sizeof(X509_CRL_METHOD)); 532 if (!m) 533 return NULL; 534 m->crl_init = crl_init; 535 m->crl_free = crl_free; 536 m->crl_lookup = crl_lookup; 537 m->crl_verify = crl_verify; 538 m->flags = X509_CRL_METHOD_DYNAMIC; 539 return m; 540 } 541 542 void X509_CRL_METHOD_free(X509_CRL_METHOD *m) 543 { 544 if (!(m->flags & X509_CRL_METHOD_DYNAMIC)) 545 return; 546 OPENSSL_free(m); 547 } 548 549 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat) 550 { 551 crl->meth_data = dat; 552 } 553 554 void *X509_CRL_get_meth_data(X509_CRL *crl) 555 { 556 return crl->meth_data; 557 } 558 559 IMPLEMENT_ASN1_SET_OF(X509_REVOKED) 560 IMPLEMENT_ASN1_SET_OF(X509_CRL) 561
