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 "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                 X509_EXTENSION *ext;
 141                 gtmp = X509_REVOKED_get_ext_d2i(rev,
 142                                                 NID_certificate_issuer,
 143                                                 &j, NULL);
 144                 if (!gtmp && (j != -1))
 145                         {
 146                         crl->flags |= EXFLAG_INVALID;
 147                         return 1;
 148                         }
 149
 150                 if (gtmp)
 151                         {
 152                         gens = gtmp;
 153                         if (!crl->issuers)
 154                                 {
 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                 /* Check for critical CRL entry extensions */
 165
 166                 exts = rev->extensions;
 167
 168                 for (j = 0; j < sk_X509_EXTENSION_num(exts); j++)
 169                         {
 170                         ext = sk_X509_EXTENSION_value(exts, j);
 171                         if (ext->critical > 0)
 172                                 {
 173                                 if (OBJ_obj2nid(ext->object) ==
 174                                         NID_certificate_issuer)
 175                                         continue;
 176                                 crl->flags |= EXFLAG_CRITICAL;
 177                                 break;
 178                                 }
 179                         }
 180
 181
 182                 }
 183
 184         return 1;
 185
 186         }
 187
 188 /* The X509_CRL structure needs a bit of customisation. Cache some extensions
 189  * and hash of the whole CRL.
 190  */
 191 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
 192                                                                 void *exarg)
 193         {
 194         X509_CRL *crl = (X509_CRL *)*pval;
 195         STACK_OF(X509_EXTENSION) *exts;
 196         X509_EXTENSION *ext;
 197         int idx;
 198
 199         switch(operation)
 200                 {
 201                 case ASN1_OP_NEW_POST:
 202                 crl->idp = NULL;
 203                 crl->akid = NULL;
 204                 crl->flags = 0;
 205                 crl->idp_flags = 0;
 206                 crl->meth = default_crl_method;
 207                 crl->meth_data = NULL;
 208                 crl->issuers = NULL;
 209                 break;
 210
 211                 case ASN1_OP_D2I_POST:
 212 #ifndef OPENSSL_NO_SHA
 213                 X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
 214 #endif
 215                 crl->idp = X509_CRL_get_ext_d2i(crl,
 216                                 NID_issuing_distribution_point, NULL, NULL);
 217                 if (crl->idp)
 218                         setup_idp(crl, crl->idp);
 219
 220                 crl->akid = X509_CRL_get_ext_d2i(crl,
 221                                 NID_authority_key_identifier, NULL, NULL);
 222
 223                 /* See if we have any unhandled critical CRL extensions and
 224                  * indicate this in a flag. We only currently handle IDP so
 225                  * anything else critical sets the flag.
 226                  *
 227                  * This code accesses the X509_CRL structure directly:
 228                  * applications shouldn't do this.
 229                  */
 230
 231                 exts = crl->crl->extensions;
 232
 233                 for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++)
 234                         {
 235                         ext = sk_X509_EXTENSION_value(exts, idx);
 236                         if (ext->critical > 0)
 237                                 {
 238                                 /* We handle IDP now so permit it */
 239                                 if (OBJ_obj2nid(ext->object) ==
 240                                         NID_issuing_distribution_point)
 241                                         continue;
 242                                 crl->flags |= EXFLAG_CRITICAL;
 243                                 break;
 244                                 }
 245                         }
 246
 247
 248                 if (!crl_set_issuers(crl))
 249                         return 0;
 250
 251                 if (crl->meth->crl_init)
 252                         {
 253                         if (crl->meth->crl_init(crl) == 0)
 254                                 return 0;
 255                         }
 256                 break;
 257
 258                 case ASN1_OP_FREE_POST:
 259                 if (crl->meth->crl_free)
 260                         {
 261                         if (!crl->meth->crl_free(crl))
 262                                 return 0;
 263                         }
 264                 if (crl->akid)
 265                         AUTHORITY_KEYID_free(crl->akid);
 266                 if (crl->idp)
 267                         ISSUING_DIST_POINT_free(crl->idp);
 268                 sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 269                 break;
 270                 }
 271         return 1;
 272         }
 273
 274 /* Convert IDP into a more convenient form */
 275
 276 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
 277         {
 278         int idp_only = 0;
 279         /* Set various flags according to IDP */
 280         crl->idp_flags |= IDP_PRESENT;
 281         if (idp->onlyuser > 0)
 282                 {
 283                 idp_only++;
 284                 crl->idp_flags |= IDP_ONLYUSER;
 285                 }
 286         if (idp->onlyCA > 0)
 287                 {
 288                 idp_only++;
 289                 crl->idp_flags |= IDP_ONLYCA;
 290                 }
 291         if (idp->onlyattr > 0)
 292                 {
 293                 idp_only++;
 294                 crl->idp_flags |= IDP_ONLYATTR;
 295                 }
 296
 297         if (idp_only > 1)
 298                 crl->idp_flags |= IDP_INVALID;
 299
 300         if (idp->indirectCRL > 0)
 301                 crl->idp_flags |= IDP_INDIRECT;
 302
 303         if (idp->onlysomereasons)
 304                 {
 305                 crl->idp_flags |= IDP_REASONS;
 306                 if (idp->onlysomereasons->length > 0)
 307                         crl->idp_reasons = idp->onlysomereasons->data[0];
 308                 if (idp->onlysomereasons->length > 1)
 309                         crl->idp_reasons |=
 310                                 (idp->onlysomereasons->data[1] << 8);
 311                 }
 312
 313         DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
 314         }
 315
 316 ASN1_SEQUENCE_ref(X509_CRL, crl_cb, CRYPTO_LOCK_X509_CRL) = {
 317         ASN1_SIMPLE(X509_CRL, crl, X509_CRL_INFO),
 318         ASN1_SIMPLE(X509_CRL, sig_alg, X509_ALGOR),
 319         ASN1_SIMPLE(X509_CRL, signature, ASN1_BIT_STRING)
 320 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
 321
 322 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 323 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 324 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 325 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 326
 327 static int X509_REVOKED_cmp(const X509_REVOKED * const *a,
 328                         const X509_REVOKED * const *b)
 329         {
 330         return(ASN1_STRING_cmp(
 331                 (ASN1_STRING *)(*a)->serialNumber,
 332                 (ASN1_STRING *)(*b)->serialNumber));
 333         }
 334
 335 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
 336 {
 337         X509_CRL_INFO *inf;
 338         inf = crl->crl;
 339         if(!inf->revoked)
 340                 inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
 341         if(!inf->revoked || !sk_X509_REVOKED_push(inf->revoked, rev)) {
 342                 ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
 343                 return 0;
 344         }
 345         inf->enc.modified = 1;
 346         return 1;
 347 }
 348
 349 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
 350         {
 351         if (crl->meth->crl_verify)
 352                 return crl->meth->crl_verify(crl, r);
 353         return 0;
 354         }
 355
 356 int X509_CRL_get0_by_serial(X509_CRL *crl,
 357                 X509_REVOKED **ret, ASN1_INTEGER *serial)
 358         {
 359         if (crl->meth->crl_lookup)
 360                 return crl->meth->crl_lookup(crl, ret, serial, NULL);
 361         return 0;
 362         }
 363
 364 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
 365         {
 366         if (crl->meth->crl_lookup)
 367                 return crl->meth->crl_lookup(crl, ret,
 368                                                 X509_get_serialNumber(x),
 369                                                 X509_get_issuer_name(x));
 370         return 0;
 371         }
 372
 373 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
 374         {
 375         return(ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
 376                 crl->sig_alg, crl->signature,crl->crl,r));
 377         }
 378
 379 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
 380                                                 X509_REVOKED *rev)
 381         {
 382         int i;
 383
 384         if (!rev->issuer)
 385                 {
 386                 if (!nm)
 387                         return 1;
 388                 if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
 389                         return 1;
 390                 return 0;
 391                 }
 392
 393         if (!nm)
 394                 nm = X509_CRL_get_issuer(crl);
 395
 396         for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++)
 397                 {
 398                 GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
 399                 if (gen->type != GEN_DIRNAME)
 400                         continue;
 401                 if (!X509_NAME_cmp(nm, gen->d.directoryName))
 402                         return 1;
 403                 }
 404         return 0;
 405
 406         }
 407
 408 static int def_crl_lookup(X509_CRL *crl,
 409                 X509_REVOKED **ret, ASN1_INTEGER *serial, X509_NAME *issuer)
 410         {
 411         X509_REVOKED rtmp, *rev;
 412         int idx;
 413         rtmp.serialNumber = serial;
 414         /* Sort revoked into serial number order if not already sorted.
 415          * Do this under a lock to avoid race condition.
 416          */
 417         if (!sk_X509_REVOKED_is_sorted(crl->crl->revoked))
 418                 {
 419                 CRYPTO_w_lock(CRYPTO_LOCK_X509_CRL);
 420                 sk_X509_REVOKED_sort(crl->crl->revoked);
 421                 CRYPTO_w_unlock(CRYPTO_LOCK_X509_CRL);
 422                 }
 423         idx = sk_X509_REVOKED_find(crl->crl->revoked, &rtmp);
 424         if(idx < 0)
 425                 return 0;
 426         /* Need to look for matching name */
 427         for(;idx < sk_X509_REVOKED_num(crl->crl->revoked); idx++)
 428                 {
 429                 rev = sk_X509_REVOKED_value(crl->crl->revoked, idx);
 430                 if (ASN1_INTEGER_cmp(rev->serialNumber, serial))
 431                         return 0;
 432                 if (crl_revoked_issuer_match(crl, issuer, rev))
 433                         {
 434                         if (ret)
 435                                 *ret = rev;
 436                         return 1;
 437                         }
 438                 }
 439         return 0;
 440         }
 441
 442 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
 443         {
 444         if (meth == NULL)
 445                 default_crl_method = &int_crl_meth;
 446         else
 447                 default_crl_method = meth;
 448         }
 449
 450 X509_CRL_METHOD *X509_CRL_METHOD_new(
 451         int (*crl_init)(X509_CRL *crl),
 452         int (*crl_free)(X509_CRL *crl),
 453         int (*crl_lookup)(X509_CRL *crl, X509_REVOKED **ret,
 454                                 ASN1_INTEGER *ser, X509_NAME *issuer),
 455         int (*crl_verify)(X509_CRL *crl, EVP_PKEY *pk))
 456         {
 457         X509_CRL_METHOD *m;
 458         m = OPENSSL_malloc(sizeof(X509_CRL_METHOD));
 459         if (!m)
 460                 return NULL;
 461         m->crl_init = crl_init;
 462         m->crl_free = crl_free;
 463         m->crl_lookup = crl_lookup;
 464         m->crl_verify = crl_verify;
 465         m->flags = X509_CRL_METHOD_DYNAMIC;
 466         return m;
 467         }
 468
 469 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
 470         {
 471         if (!(m->flags & X509_CRL_METHOD_DYNAMIC))
 472                 return;
 473         OPENSSL_free(m);
 474         }
 475
 476 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
 477         {
 478         crl->meth_data = dat;
 479         }
 480
 481 void *X509_CRL_get_meth_data(X509_CRL *crl)
 482         {
 483         return crl->meth_data;
 484         }
 485
 486 IMPLEMENT_STACK_OF(X509_REVOKED)
 487 IMPLEMENT_ASN1_SET_OF(X509_REVOKED)
 488 IMPLEMENT_STACK_OF(X509_CRL)
 489 IMPLEMENT_ASN1_SET_OF(X509_CRL)