crypto/asn1/x_crl.c

   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 <openssl/asn1t.h>
  62 #include "asn1_locl.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,
  79                           X509_NAME *issuer);
  80
  81 static X509_CRL_METHOD int_crl_meth = {
  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 /*
  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  */
  95 static 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
 115 ASN1_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
 130 static 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  */
 200 static 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
 300 static 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
 336 ASN1_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
 342 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 343
 344 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
 345
 346 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 347 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 348 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 349
 350 static 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
 357 int 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
 371 int 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
 378 int 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
 386 int 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
 395 static 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
 401 static 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
 428 static 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
 463 void 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
 471 X509_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
 492 void 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
 499 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
 500 {
 501     crl->meth_data = dat;
 502 }
 503
 504 void *X509_CRL_get_meth_data(X509_CRL *crl)
 505 {
 506     return crl->meth_data;
 507 }
 508
 509 IMPLEMENT_STACK_OF(X509_REVOKED)
 510
 511 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
 512
 513 IMPLEMENT_STACK_OF(X509_CRL)
 514 IMPLEMENT_ASN1_SET_OF(X509_CRL)