crypto/x509/x_crl.c

   1 /* crypto/x509/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 "internal/cryptlib.h"
  61 #include <openssl/asn1t.h>
  62 #include <openssl/x509.h>
  63 #include "internal/x509_int.h"
  64 #include <openssl/x509v3.h>
  65 #include "x509_lcl.h"
  66
  67 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
  68                             const X509_REVOKED *const *b);
  69 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
  70
  71 ASN1_SEQUENCE(X509_REVOKED) = {
  72         ASN1_EMBED(X509_REVOKED,serialNumber, ASN1_INTEGER),
  73         ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
  74         ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
  75 } ASN1_SEQUENCE_END(X509_REVOKED)
  76
  77 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
  78 static int def_crl_lookup(X509_CRL *crl,
  79                           X509_REVOKED **ret, ASN1_INTEGER *serial,
  80                           X509_NAME *issuer);
  81
  82 static X509_CRL_METHOD int_crl_meth = {
  83     0,
  84     0, 0,
  85     def_crl_lookup,
  86     def_crl_verify
  87 };
  88
  89 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
  90
  91 /*
  92  * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
  93  * the original encoding the signature wont be affected by reordering of the
  94  * revoked field.
  95  */
  96 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  97                       void *exarg)
  98 {
  99     X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
 100
 101     if (!a || !a->revoked)
 102         return 1;
 103     switch (operation) {
 104         /*
 105          * Just set cmp function here. We don't sort because that would
 106          * affect the output of X509_CRL_print().
 107          */
 108     case ASN1_OP_D2I_POST:
 109         (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
 110         break;
 111     }
 112     return 1;
 113 }
 114
 115
 116 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
 117         ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
 118         ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR),
 119         ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
 120         ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
 121         ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
 122         ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
 123         ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
 124 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
 125
 126 /*
 127  * Set CRL entry issuer according to CRL certificate issuer extension. Check
 128  * for unhandled critical CRL entry extensions.
 129  */
 130
 131 static int crl_set_issuers(X509_CRL *crl)
 132 {
 133
 134     int i, j;
 135     GENERAL_NAMES *gens, *gtmp;
 136     STACK_OF(X509_REVOKED) *revoked;
 137
 138     revoked = X509_CRL_get_REVOKED(crl);
 139
 140     gens = NULL;
 141     for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
 142         X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
 143         STACK_OF(X509_EXTENSION) *exts;
 144         ASN1_ENUMERATED *reason;
 145         X509_EXTENSION *ext;
 146         gtmp = X509_REVOKED_get_ext_d2i(rev,
 147                                         NID_certificate_issuer, &j, NULL);
 148         if (!gtmp && (j != -1)) {
 149             crl->flags |= EXFLAG_INVALID;
 150             return 1;
 151         }
 152
 153         if (gtmp) {
 154             gens = gtmp;
 155             if (!crl->issuers) {
 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, &j, NULL);
 166         if (!reason && (j != -1)) {
 167             crl->flags |= EXFLAG_INVALID;
 168             return 1;
 169         }
 170
 171         if (reason) {
 172             rev->reason = ASN1_ENUMERATED_get(reason);
 173             ASN1_ENUMERATED_free(reason);
 174         } else
 175             rev->reason = CRL_REASON_NONE;
 176
 177         /* Check for critical CRL entry extensions */
 178
 179         exts = rev->extensions;
 180
 181         for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
 182             ext = sk_X509_EXTENSION_value(exts, j);
 183             if (X509_EXTENSION_get_critical(ext)) {
 184                 if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer)
 185                     continue;
 186                 crl->flags |= EXFLAG_CRITICAL;
 187                 break;
 188             }
 189         }
 190
 191     }
 192
 193     return 1;
 194
 195 }
 196
 197 /*
 198  * The X509_CRL structure needs a bit of customisation. Cache some extensions
 199  * and hash of the whole CRL.
 200  */
 201 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
 202                   void *exarg)
 203 {
 204     X509_CRL *crl = (X509_CRL *)*pval;
 205     STACK_OF(X509_EXTENSION) *exts;
 206     X509_EXTENSION *ext;
 207     int idx;
 208
 209     switch (operation) {
 210     case ASN1_OP_NEW_POST:
 211         crl->idp = NULL;
 212         crl->akid = NULL;
 213         crl->flags = 0;
 214         crl->idp_flags = 0;
 215         crl->idp_reasons = CRLDP_ALL_REASONS;
 216         crl->meth = default_crl_method;
 217         crl->meth_data = NULL;
 218         crl->issuers = NULL;
 219         crl->crl_number = NULL;
 220         crl->base_crl_number = NULL;
 221         break;
 222
 223     case ASN1_OP_D2I_POST:
 224         X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
 225         crl->idp = X509_CRL_get_ext_d2i(crl,
 226                                         NID_issuing_distribution_point, NULL,
 227                                         NULL);
 228         if (crl->idp)
 229             setup_idp(crl, crl->idp);
 230
 231         crl->akid = X509_CRL_get_ext_d2i(crl,
 232                                          NID_authority_key_identifier, NULL,
 233                                          NULL);
 234
 235         crl->crl_number = X509_CRL_get_ext_d2i(crl,
 236                                                NID_crl_number, NULL, NULL);
 237
 238         crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
 239                                                     NID_delta_crl, NULL,
 240                                                     NULL);
 241         /* Delta CRLs must have CRL number */
 242         if (crl->base_crl_number && !crl->crl_number)
 243             crl->flags |= EXFLAG_INVALID;
 244
 245         /*
 246          * See if we have any unhandled critical CRL extensions and indicate
 247          * this in a flag. We only currently handle IDP so anything else
 248          * critical sets the flag. This code accesses the X509_CRL structure
 249          * directly: applications shouldn't do this.
 250          */
 251
 252         exts = crl->crl.extensions;
 253
 254         for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
 255             int nid;
 256             ext = sk_X509_EXTENSION_value(exts, idx);
 257             nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
 258             if (nid == NID_freshest_crl)
 259                 crl->flags |= EXFLAG_FRESHEST;
 260             if (X509_EXTENSION_get_critical(ext)) {
 261                 /* We handle IDP and deltas */
 262                 if ((nid == NID_issuing_distribution_point)
 263                     || (nid == NID_authority_key_identifier)
 264                     || (nid == NID_delta_crl))
 265                     break;;
 266                 crl->flags |= EXFLAG_CRITICAL;
 267                 break;
 268             }
 269         }
 270
 271         if (!crl_set_issuers(crl))
 272             return 0;
 273
 274         if (crl->meth->crl_init) {
 275             if (crl->meth->crl_init(crl) == 0)
 276                 return 0;
 277         }
 278         break;
 279
 280     case ASN1_OP_FREE_POST:
 281         if (crl->meth->crl_free) {
 282             if (!crl->meth->crl_free(crl))
 283                 return 0;
 284         }
 285         AUTHORITY_KEYID_free(crl->akid);
 286         ISSUING_DIST_POINT_free(crl->idp);
 287         ASN1_INTEGER_free(crl->crl_number);
 288         ASN1_INTEGER_free(crl->base_crl_number);
 289         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 290         break;
 291     }
 292     return 1;
 293 }
 294
 295 /* Convert IDP into a more convenient form */
 296
 297 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
 298 {
 299     int idp_only = 0;
 300     /* Set various flags according to IDP */
 301     crl->idp_flags |= IDP_PRESENT;
 302     if (idp->onlyuser > 0) {
 303         idp_only++;
 304         crl->idp_flags |= IDP_ONLYUSER;
 305     }
 306     if (idp->onlyCA > 0) {
 307         idp_only++;
 308         crl->idp_flags |= IDP_ONLYCA;
 309     }
 310     if (idp->onlyattr > 0) {
 311         idp_only++;
 312         crl->idp_flags |= IDP_ONLYATTR;
 313     }
 314
 315     if (idp_only > 1)
 316         crl->idp_flags |= IDP_INVALID;
 317
 318     if (idp->indirectCRL > 0)
 319         crl->idp_flags |= IDP_INDIRECT;
 320
 321     if (idp->onlysomereasons) {
 322         crl->idp_flags |= IDP_REASONS;
 323         if (idp->onlysomereasons->length > 0)
 324             crl->idp_reasons = idp->onlysomereasons->data[0];
 325         if (idp->onlysomereasons->length > 1)
 326             crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
 327         crl->idp_reasons &= CRLDP_ALL_REASONS;
 328     }
 329
 330     DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
 331 }
 332
 333 ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
 334         ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
 335         ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
 336         ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
 337 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
 338
 339 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 340
 341 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
 342
 343 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 344
 345 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 346
 347 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 348
 349 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
 350                             const X509_REVOKED *const *b)
 351 {
 352     return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
 353                             (ASN1_STRING *)&(*b)->serialNumber));
 354 }
 355
 356 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
 357 {
 358     X509_CRL_INFO *inf;
 359     inf = &crl->crl;
 360     if (inf->revoked == NULL)
 361         inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
 362     if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
 363         ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
 364         return 0;
 365     }
 366     inf->enc.modified = 1;
 367     return 1;
 368 }
 369
 370 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
 371 {
 372     if (crl->meth->crl_verify)
 373         return crl->meth->crl_verify(crl, r);
 374     return 0;
 375 }
 376
 377 int X509_CRL_get0_by_serial(X509_CRL *crl,
 378                             X509_REVOKED **ret, ASN1_INTEGER *serial)
 379 {
 380     if (crl->meth->crl_lookup)
 381         return crl->meth->crl_lookup(crl, ret, serial, NULL);
 382     return 0;
 383 }
 384
 385 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
 386 {
 387     if (crl->meth->crl_lookup)
 388         return crl->meth->crl_lookup(crl, ret,
 389                                      X509_get_serialNumber(x),
 390                                      X509_get_issuer_name(x));
 391     return 0;
 392 }
 393
 394 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
 395 {
 396     return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
 397                              &crl->sig_alg, &crl->signature, &crl->crl, r));
 398 }
 399
 400 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
 401                                     X509_REVOKED *rev)
 402 {
 403     int i;
 404
 405     if (!rev->issuer) {
 406         if (!nm)
 407             return 1;
 408         if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
 409             return 1;
 410         return 0;
 411     }
 412
 413     if (!nm)
 414         nm = X509_CRL_get_issuer(crl);
 415
 416     for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
 417         GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
 418         if (gen->type != GEN_DIRNAME)
 419             continue;
 420         if (!X509_NAME_cmp(nm, gen->d.directoryName))
 421             return 1;
 422     }
 423     return 0;
 424
 425 }
 426
 427 static int def_crl_lookup(X509_CRL *crl,
 428                           X509_REVOKED **ret, ASN1_INTEGER *serial,
 429                           X509_NAME *issuer)
 430 {
 431     X509_REVOKED rtmp, *rev;
 432     int idx;
 433     rtmp.serialNumber = *serial;
 434     /*
 435      * Sort revoked into serial number order if not already sorted. Do this
 436      * under a lock to avoid race condition.
 437      */
 438     if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
 439         CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
 440         sk_X509_REVOKED_sort(crl->crl.revoked);
 441         CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
 442     }
 443     idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
 444     if (idx < 0)
 445         return 0;
 446     /* Need to look for matching name */
 447     for (; idx < sk_X509_REVOKED_num(crl->crl.revoked); idx++) {
 448         rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
 449         if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
 450             return 0;
 451         if (crl_revoked_issuer_match(crl, issuer, rev)) {
 452             if (ret)
 453                 *ret = rev;
 454             if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
 455                 return 2;
 456             return 1;
 457         }
 458     }
 459     return 0;
 460 }
 461
 462 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
 463 {
 464     if (meth == NULL)
 465         default_crl_method = &int_crl_meth;
 466     else
 467         default_crl_method = meth;
 468 }
 469
 470 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
 471                                      int (*crl_free) (X509_CRL *crl),
 472                                      int (*crl_lookup) (X509_CRL *crl,
 473                                                         X509_REVOKED **ret,
 474                                                         ASN1_INTEGER *ser,
 475                                                         X509_NAME *issuer),
 476                                      int (*crl_verify) (X509_CRL *crl,
 477                                                         EVP_PKEY *pk))
 478 {
 479     X509_CRL_METHOD *m;
 480     m = OPENSSL_malloc(sizeof(*m));
 481     if (m == NULL)
 482         return NULL;
 483     m->crl_init = crl_init;
 484     m->crl_free = crl_free;
 485     m->crl_lookup = crl_lookup;
 486     m->crl_verify = crl_verify;
 487     m->flags = X509_CRL_METHOD_DYNAMIC;
 488     return m;
 489 }
 490
 491 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
 492 {
 493     if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
 494         return;
 495     OPENSSL_free(m);
 496 }
 497
 498 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
 499 {
 500     crl->meth_data = dat;
 501 }
 502
 503 void *X509_CRL_get_meth_data(X509_CRL *crl)
 504 {
 505     return crl->meth_data;
 506 }