crypto/x509/x_crl.c

   1 /*
   2  * Copyright 1995-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #include <stdio.h>
  11 #include "internal/cryptlib.h"
  12 #include <openssl/asn1t.h>
  13 #include <openssl/x509.h>
  14 #include "internal/x509_int.h"
  15 #include <openssl/x509v3.h>
  16 #include "x509_lcl.h"
  17
  18 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
  19                             const X509_REVOKED *const *b);
  20 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
  21
  22 ASN1_SEQUENCE(X509_REVOKED) = {
  23         ASN1_EMBED(X509_REVOKED,serialNumber, ASN1_INTEGER),
  24         ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
  25         ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
  26 } ASN1_SEQUENCE_END(X509_REVOKED)
  27
  28 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
  29 static int def_crl_lookup(X509_CRL *crl,
  30                           X509_REVOKED **ret, ASN1_INTEGER *serial,
  31                           X509_NAME *issuer);
  32
  33 static X509_CRL_METHOD int_crl_meth = {
  34     0,
  35     0, 0,
  36     def_crl_lookup,
  37     def_crl_verify
  38 };
  39
  40 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
  41
  42 /*
  43  * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
  44  * the original encoding the signature won't be affected by reordering of the
  45  * revoked field.
  46  */
  47 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  48                       void *exarg)
  49 {
  50     X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
  51
  52     if (!a || !a->revoked)
  53         return 1;
  54     switch (operation) {
  55         /*
  56          * Just set cmp function here. We don't sort because that would
  57          * affect the output of X509_CRL_print().
  58          */
  59     case ASN1_OP_D2I_POST:
  60         (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
  61         break;
  62     }
  63     return 1;
  64 }
  65
  66
  67 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
  68         ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
  69         ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR),
  70         ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
  71         ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
  72         ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
  73         ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
  74         ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
  75 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
  76
  77 /*
  78  * Set CRL entry issuer according to CRL certificate issuer extension. Check
  79  * for unhandled critical CRL entry extensions.
  80  */
  81
  82 static int crl_set_issuers(X509_CRL *crl)
  83 {
  84
  85     int i, j;
  86     GENERAL_NAMES *gens, *gtmp;
  87     STACK_OF(X509_REVOKED) *revoked;
  88
  89     revoked = X509_CRL_get_REVOKED(crl);
  90
  91     gens = NULL;
  92     for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
  93         X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
  94         STACK_OF(X509_EXTENSION) *exts;
  95         ASN1_ENUMERATED *reason;
  96         X509_EXTENSION *ext;
  97         gtmp = X509_REVOKED_get_ext_d2i(rev,
  98                                         NID_certificate_issuer, &j, NULL);
  99         if (!gtmp && (j != -1)) {
 100             crl->flags |= EXFLAG_INVALID;
 101             return 1;
 102         }
 103
 104         if (gtmp) {
 105             gens = gtmp;
 106             if (!crl->issuers) {
 107                 crl->issuers = sk_GENERAL_NAMES_new_null();
 108                 if (!crl->issuers)
 109                     return 0;
 110             }
 111             if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
 112                 return 0;
 113         }
 114         rev->issuer = gens;
 115
 116         reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
 117         if (!reason && (j != -1)) {
 118             crl->flags |= EXFLAG_INVALID;
 119             return 1;
 120         }
 121
 122         if (reason) {
 123             rev->reason = ASN1_ENUMERATED_get(reason);
 124             ASN1_ENUMERATED_free(reason);
 125         } else
 126             rev->reason = CRL_REASON_NONE;
 127
 128         /* Check for critical CRL entry extensions */
 129
 130         exts = rev->extensions;
 131
 132         for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
 133             ext = sk_X509_EXTENSION_value(exts, j);
 134             if (X509_EXTENSION_get_critical(ext)) {
 135                 if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer)
 136                     continue;
 137                 crl->flags |= EXFLAG_CRITICAL;
 138                 break;
 139             }
 140         }
 141
 142     }
 143
 144     return 1;
 145
 146 }
 147
 148 /*
 149  * The X509_CRL structure needs a bit of customisation. Cache some extensions
 150  * and hash of the whole CRL.
 151  */
 152 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
 153                   void *exarg)
 154 {
 155     X509_CRL *crl = (X509_CRL *)*pval;
 156     STACK_OF(X509_EXTENSION) *exts;
 157     X509_EXTENSION *ext;
 158     int idx;
 159
 160     switch (operation) {
 161     case ASN1_OP_NEW_POST:
 162         crl->idp = NULL;
 163         crl->akid = NULL;
 164         crl->flags = 0;
 165         crl->idp_flags = 0;
 166         crl->idp_reasons = CRLDP_ALL_REASONS;
 167         crl->meth = default_crl_method;
 168         crl->meth_data = NULL;
 169         crl->issuers = NULL;
 170         crl->crl_number = NULL;
 171         crl->base_crl_number = NULL;
 172         break;
 173
 174     case ASN1_OP_D2I_POST:
 175         X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL);
 176         crl->idp = X509_CRL_get_ext_d2i(crl,
 177                                         NID_issuing_distribution_point, NULL,
 178                                         NULL);
 179         if (crl->idp)
 180             setup_idp(crl, crl->idp);
 181
 182         crl->akid = X509_CRL_get_ext_d2i(crl,
 183                                          NID_authority_key_identifier, NULL,
 184                                          NULL);
 185
 186         crl->crl_number = X509_CRL_get_ext_d2i(crl,
 187                                                NID_crl_number, NULL, NULL);
 188
 189         crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
 190                                                     NID_delta_crl, NULL,
 191                                                     NULL);
 192         /* Delta CRLs must have CRL number */
 193         if (crl->base_crl_number && !crl->crl_number)
 194             crl->flags |= EXFLAG_INVALID;
 195
 196         /*
 197          * See if we have any unhandled critical CRL extensions and indicate
 198          * this in a flag. We only currently handle IDP so anything else
 199          * critical sets the flag. This code accesses the X509_CRL structure
 200          * directly: applications shouldn't do this.
 201          */
 202
 203         exts = crl->crl.extensions;
 204
 205         for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
 206             int nid;
 207             ext = sk_X509_EXTENSION_value(exts, idx);
 208             nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
 209             if (nid == NID_freshest_crl)
 210                 crl->flags |= EXFLAG_FRESHEST;
 211             if (X509_EXTENSION_get_critical(ext)) {
 212                 /* We handle IDP and deltas */
 213                 if ((nid == NID_issuing_distribution_point)
 214                     || (nid == NID_authority_key_identifier)
 215                     || (nid == NID_delta_crl))
 216                     continue;
 217                 crl->flags |= EXFLAG_CRITICAL;
 218                 break;
 219             }
 220         }
 221
 222         if (!crl_set_issuers(crl))
 223             return 0;
 224
 225         if (crl->meth->crl_init) {
 226             if (crl->meth->crl_init(crl) == 0)
 227                 return 0;
 228         }
 229
 230         crl->flags |= EXFLAG_SET;
 231         break;
 232
 233     case ASN1_OP_FREE_POST:
 234         if (crl->meth->crl_free) {
 235             if (!crl->meth->crl_free(crl))
 236                 return 0;
 237         }
 238         AUTHORITY_KEYID_free(crl->akid);
 239         ISSUING_DIST_POINT_free(crl->idp);
 240         ASN1_INTEGER_free(crl->crl_number);
 241         ASN1_INTEGER_free(crl->base_crl_number);
 242         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 243         break;
 244     }
 245     return 1;
 246 }
 247
 248 /* Convert IDP into a more convenient form */
 249
 250 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
 251 {
 252     int idp_only = 0;
 253     /* Set various flags according to IDP */
 254     crl->idp_flags |= IDP_PRESENT;
 255     if (idp->onlyuser > 0) {
 256         idp_only++;
 257         crl->idp_flags |= IDP_ONLYUSER;
 258     }
 259     if (idp->onlyCA > 0) {
 260         idp_only++;
 261         crl->idp_flags |= IDP_ONLYCA;
 262     }
 263     if (idp->onlyattr > 0) {
 264         idp_only++;
 265         crl->idp_flags |= IDP_ONLYATTR;
 266     }
 267
 268     if (idp_only > 1)
 269         crl->idp_flags |= IDP_INVALID;
 270
 271     if (idp->indirectCRL > 0)
 272         crl->idp_flags |= IDP_INDIRECT;
 273
 274     if (idp->onlysomereasons) {
 275         crl->idp_flags |= IDP_REASONS;
 276         if (idp->onlysomereasons->length > 0)
 277             crl->idp_reasons = idp->onlysomereasons->data[0];
 278         if (idp->onlysomereasons->length > 1)
 279             crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
 280         crl->idp_reasons &= CRLDP_ALL_REASONS;
 281     }
 282
 283     DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
 284 }
 285
 286 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
 287         ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
 288         ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
 289         ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
 290 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
 291
 292 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 293
 294 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
 295
 296 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 297
 298 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 299
 300 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 301
 302 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
 303                             const X509_REVOKED *const *b)
 304 {
 305     return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
 306                             (ASN1_STRING *)&(*b)->serialNumber));
 307 }
 308
 309 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
 310 {
 311     X509_CRL_INFO *inf;
 312
 313     inf = &crl->crl;
 314     if (inf->revoked == NULL)
 315         inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
 316     if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
 317         ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
 318         return 0;
 319     }
 320     inf->enc.modified = 1;
 321     return 1;
 322 }
 323
 324 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
 325 {
 326     if (crl->meth->crl_verify)
 327         return crl->meth->crl_verify(crl, r);
 328     return 0;
 329 }
 330
 331 int X509_CRL_get0_by_serial(X509_CRL *crl,
 332                             X509_REVOKED **ret, ASN1_INTEGER *serial)
 333 {
 334     if (crl->meth->crl_lookup)
 335         return crl->meth->crl_lookup(crl, ret, serial, NULL);
 336     return 0;
 337 }
 338
 339 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
 340 {
 341     if (crl->meth->crl_lookup)
 342         return crl->meth->crl_lookup(crl, ret,
 343                                      X509_get_serialNumber(x),
 344                                      X509_get_issuer_name(x));
 345     return 0;
 346 }
 347
 348 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
 349 {
 350     return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
 351                              &crl->sig_alg, &crl->signature, &crl->crl, r));
 352 }
 353
 354 static int crl_revoked_issuer_match(X509_CRL *crl, X509_NAME *nm,
 355                                     X509_REVOKED *rev)
 356 {
 357     int i;
 358
 359     if (!rev->issuer) {
 360         if (!nm)
 361             return 1;
 362         if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
 363             return 1;
 364         return 0;
 365     }
 366
 367     if (!nm)
 368         nm = X509_CRL_get_issuer(crl);
 369
 370     for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
 371         GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
 372         if (gen->type != GEN_DIRNAME)
 373             continue;
 374         if (!X509_NAME_cmp(nm, gen->d.directoryName))
 375             return 1;
 376     }
 377     return 0;
 378
 379 }
 380
 381 static int def_crl_lookup(X509_CRL *crl,
 382                           X509_REVOKED **ret, ASN1_INTEGER *serial,
 383                           X509_NAME *issuer)
 384 {
 385     X509_REVOKED rtmp, *rev;
 386     int idx, num;
 387
 388     if (crl->crl.revoked == NULL)
 389         return 0;
 390
 391     /*
 392      * Sort revoked into serial number order if not already sorted. Do this
 393      * under a lock to avoid race condition.
 394      */
 395     if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
 396         CRYPTO_THREAD_write_lock(crl->lock);
 397         sk_X509_REVOKED_sort(crl->crl.revoked);
 398         CRYPTO_THREAD_unlock(crl->lock);
 399     }
 400     rtmp.serialNumber = *serial;
 401     idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
 402     if (idx < 0)
 403         return 0;
 404     /* Need to look for matching name */
 405     for (num = sk_X509_REVOKED_num(crl->crl.revoked); idx < num; idx++) {
 406         rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
 407         if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
 408             return 0;
 409         if (crl_revoked_issuer_match(crl, issuer, rev)) {
 410             if (ret)
 411                 *ret = rev;
 412             if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
 413                 return 2;
 414             return 1;
 415         }
 416     }
 417     return 0;
 418 }
 419
 420 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
 421 {
 422     if (meth == NULL)
 423         default_crl_method = &int_crl_meth;
 424     else
 425         default_crl_method = meth;
 426 }
 427
 428 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
 429                                      int (*crl_free) (X509_CRL *crl),
 430                                      int (*crl_lookup) (X509_CRL *crl,
 431                                                         X509_REVOKED **ret,
 432                                                         ASN1_INTEGER *ser,
 433                                                         X509_NAME *issuer),
 434                                      int (*crl_verify) (X509_CRL *crl,
 435                                                         EVP_PKEY *pk))
 436 {
 437     X509_CRL_METHOD *m = OPENSSL_malloc(sizeof(*m));
 438
 439     if (m == NULL) {
 440         X509err(X509_F_X509_CRL_METHOD_NEW, ERR_R_MALLOC_FAILURE);
 441         return NULL;
 442     }
 443     m->crl_init = crl_init;
 444     m->crl_free = crl_free;
 445     m->crl_lookup = crl_lookup;
 446     m->crl_verify = crl_verify;
 447     m->flags = X509_CRL_METHOD_DYNAMIC;
 448     return m;
 449 }
 450
 451 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
 452 {
 453     if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC))
 454         return;
 455     OPENSSL_free(m);
 456 }
 457
 458 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
 459 {
 460     crl->meth_data = dat;
 461 }
 462
 463 void *X509_CRL_get_meth_data(X509_CRL *crl)
 464 {
 465     return crl->meth_data;
 466 }