crypto/x509/x_crl.c

   1 /*
   2  * Copyright 1995-2020 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (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 "crypto/x509.h"
  15 #include <openssl/x509v3.h>
  16 #include "x509_local.h"
  17
  18 DEFINE_STACK_OF(GENERAL_NAME)
  19 DEFINE_STACK_OF(GENERAL_NAMES)
  20 DEFINE_STACK_OF(X509_REVOKED)
  21 DEFINE_STACK_OF(X509_EXTENSION)
  22
  23 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
  24                             const X509_REVOKED *const *b);
  25 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
  26
  27 ASN1_SEQUENCE(X509_REVOKED) = {
  28         ASN1_EMBED(X509_REVOKED,serialNumber, ASN1_INTEGER),
  29         ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
  30         ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
  31 } ASN1_SEQUENCE_END(X509_REVOKED)
  32
  33 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
  34 static int def_crl_lookup(X509_CRL *crl,
  35                           X509_REVOKED **ret, const ASN1_INTEGER *serial,
  36                           const X509_NAME *issuer);
  37
  38 static X509_CRL_METHOD int_crl_meth = {
  39     0,
  40     0, 0,
  41     def_crl_lookup,
  42     def_crl_verify
  43 };
  44
  45 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
  46
  47 /*
  48  * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
  49  * the original encoding the signature won't be affected by reordering of the
  50  * revoked field.
  51  */
  52 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  53                       void *exarg)
  54 {
  55     X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
  56
  57     if (!a || !a->revoked)
  58         return 1;
  59     switch (operation) {
  60         /*
  61          * Just set cmp function here. We don't sort because that would
  62          * affect the output of X509_CRL_print().
  63          */
  64     case ASN1_OP_D2I_POST:
  65         (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
  66         break;
  67     }
  68     return 1;
  69 }
  70
  71
  72 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
  73         ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
  74         ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR),
  75         ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
  76         ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
  77         ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
  78         ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
  79         ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
  80 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
  81
  82 /*
  83  * Set CRL entry issuer according to CRL certificate issuer extension. Check
  84  * for unhandled critical CRL entry extensions.
  85  */
  86
  87 static int crl_set_issuers(X509_CRL *crl)
  88 {
  89
  90     int i, j;
  91     GENERAL_NAMES *gens, *gtmp;
  92     STACK_OF(X509_REVOKED) *revoked;
  93
  94     revoked = X509_CRL_get_REVOKED(crl);
  95
  96     gens = NULL;
  97     for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
  98         X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
  99         STACK_OF(X509_EXTENSION) *exts;
 100         ASN1_ENUMERATED *reason;
 101         X509_EXTENSION *ext;
 102         gtmp = X509_REVOKED_get_ext_d2i(rev,
 103                                         NID_certificate_issuer, &j, NULL);
 104         if (!gtmp && (j != -1)) {
 105             crl->flags |= EXFLAG_INVALID;
 106             return 1;
 107         }
 108
 109         if (gtmp) {
 110             gens = gtmp;
 111             if (!crl->issuers) {
 112                 crl->issuers = sk_GENERAL_NAMES_new_null();
 113                 if (!crl->issuers)
 114                     return 0;
 115             }
 116             if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
 117                 return 0;
 118         }
 119         rev->issuer = gens;
 120
 121         reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
 122         if (!reason && (j != -1)) {
 123             crl->flags |= EXFLAG_INVALID;
 124             return 1;
 125         }
 126
 127         if (reason) {
 128             rev->reason = ASN1_ENUMERATED_get(reason);
 129             ASN1_ENUMERATED_free(reason);
 130         } else
 131             rev->reason = CRL_REASON_NONE;
 132
 133         /* Check for critical CRL entry extensions */
 134
 135         exts = rev->extensions;
 136
 137         for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
 138             ext = sk_X509_EXTENSION_value(exts, j);
 139             if (X509_EXTENSION_get_critical(ext)) {
 140                 if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer)
 141                     continue;
 142                 crl->flags |= EXFLAG_CRITICAL;
 143                 break;
 144             }
 145         }
 146
 147     }
 148
 149     return 1;
 150
 151 }
 152
 153 /*
 154  * The X509_CRL structure needs a bit of customisation. Cache some extensions
 155  * and hash of the whole CRL.
 156  */
 157 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
 158                   void *exarg)
 159 {
 160     X509_CRL *crl = (X509_CRL *)*pval;
 161     STACK_OF(X509_EXTENSION) *exts;
 162     X509_EXTENSION *ext;
 163     int idx, i;
 164
 165     switch (operation) {
 166     case ASN1_OP_D2I_PRE:
 167         if (crl->meth->crl_free) {
 168             if (!crl->meth->crl_free(crl))
 169                 return 0;
 170         }
 171         AUTHORITY_KEYID_free(crl->akid);
 172         ISSUING_DIST_POINT_free(crl->idp);
 173         ASN1_INTEGER_free(crl->crl_number);
 174         ASN1_INTEGER_free(crl->base_crl_number);
 175         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 176         /* fall thru */
 177
 178     case ASN1_OP_NEW_POST:
 179         crl->idp = NULL;
 180         crl->akid = NULL;
 181         crl->flags = 0;
 182         crl->idp_flags = 0;
 183         crl->idp_reasons = CRLDP_ALL_REASONS;
 184         crl->meth = default_crl_method;
 185         crl->meth_data = NULL;
 186         crl->issuers = NULL;
 187         crl->crl_number = NULL;
 188         crl->base_crl_number = NULL;
 189         break;
 190
 191     case ASN1_OP_D2I_POST:
 192         if (!X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL))
 193             crl->flags |= EXFLAG_INVALID;
 194         crl->idp = X509_CRL_get_ext_d2i(crl,
 195                                         NID_issuing_distribution_point, &i,
 196                                         NULL);
 197         if (crl->idp != NULL) {
 198             if (!setup_idp(crl, crl->idp))
 199                 crl->flags |= EXFLAG_INVALID;
 200         }
 201         else if (i != -1) {
 202             crl->flags |= EXFLAG_INVALID;
 203         }
 204
 205         crl->akid = X509_CRL_get_ext_d2i(crl,
 206                                          NID_authority_key_identifier, &i,
 207                                          NULL);
 208         if (crl->akid == NULL && i != -1)
 209             crl->flags |= EXFLAG_INVALID;
 210
 211         crl->crl_number = X509_CRL_get_ext_d2i(crl,
 212                                                NID_crl_number, &i, NULL);
 213         if (crl->crl_number == NULL && i != -1)
 214             crl->flags |= EXFLAG_INVALID;
 215
 216         crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
 217                                                     NID_delta_crl, &i,
 218                                                     NULL);
 219         if (crl->base_crl_number == NULL && i != -1)
 220             crl->flags |= EXFLAG_INVALID;
 221         /* Delta CRLs must have CRL number */
 222         if (crl->base_crl_number && !crl->crl_number)
 223             crl->flags |= EXFLAG_INVALID;
 224
 225         /*
 226          * See if we have any unhandled critical CRL extensions and indicate
 227          * this in a flag. We only currently handle IDP so anything else
 228          * critical sets the flag. This code accesses the X509_CRL structure
 229          * directly: applications shouldn't do this.
 230          */
 231
 232         exts = crl->crl.extensions;
 233
 234         for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
 235             int nid;
 236             ext = sk_X509_EXTENSION_value(exts, idx);
 237             nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
 238             if (nid == NID_freshest_crl)
 239                 crl->flags |= EXFLAG_FRESHEST;
 240             if (X509_EXTENSION_get_critical(ext)) {
 241                 /* We handle IDP and deltas */
 242                 if ((nid == NID_issuing_distribution_point)
 243                     || (nid == NID_authority_key_identifier)
 244                     || (nid == NID_delta_crl))
 245                     continue;
 246                 crl->flags |= EXFLAG_CRITICAL;
 247                 break;
 248             }
 249         }
 250
 251         if (!crl_set_issuers(crl))
 252             return 0;
 253
 254         if (crl->meth->crl_init) {
 255             if (crl->meth->crl_init(crl) == 0)
 256                 return 0;
 257         }
 258
 259         crl->flags |= EXFLAG_SET;
 260         break;
 261
 262     case ASN1_OP_FREE_POST:
 263         if (crl->meth->crl_free) {
 264             if (!crl->meth->crl_free(crl))
 265                 return 0;
 266         }
 267         AUTHORITY_KEYID_free(crl->akid);
 268         ISSUING_DIST_POINT_free(crl->idp);
 269         ASN1_INTEGER_free(crl->crl_number);
 270         ASN1_INTEGER_free(crl->base_crl_number);
 271         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 272         break;
 273     }
 274     return 1;
 275 }
 276
 277 /* Convert IDP into a more convenient form */
 278
 279 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
 280 {
 281     int idp_only = 0;
 282
 283     /* Set various flags according to IDP */
 284     crl->idp_flags |= IDP_PRESENT;
 285     if (idp->onlyuser > 0) {
 286         idp_only++;
 287         crl->idp_flags |= IDP_ONLYUSER;
 288     }
 289     if (idp->onlyCA > 0) {
 290         idp_only++;
 291         crl->idp_flags |= IDP_ONLYCA;
 292     }
 293     if (idp->onlyattr > 0) {
 294         idp_only++;
 295         crl->idp_flags |= IDP_ONLYATTR;
 296     }
 297
 298     if (idp_only > 1)
 299         crl->idp_flags |= IDP_INVALID;
 300
 301     if (idp->indirectCRL > 0)
 302         crl->idp_flags |= IDP_INDIRECT;
 303
 304     if (idp->onlysomereasons) {
 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 |= (idp->onlysomereasons->data[1] << 8);
 310         crl->idp_reasons &= CRLDP_ALL_REASONS;
 311     }
 312
 313     return DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
 314 }
 315
 316 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
 317         ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
 318         ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
 319         ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
 320 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
 321
 322 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 323
 324 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
 325
 326 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 327
 328 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 329
 330 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 331
 332 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
 333                             const X509_REVOKED *const *b)
 334 {
 335     return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
 336                             (ASN1_STRING *)&(*b)->serialNumber));
 337 }
 338
 339 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
 340 {
 341     X509_CRL_INFO *inf;
 342
 343     inf = &crl->crl;
 344     if (inf->revoked == NULL)
 345         inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
 346     if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
 347         ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
 348         return 0;
 349     }
 350     inf->enc.modified = 1;
 351     return 1;
 352 }
 353
 354 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
 355 {
 356     if (crl->meth->crl_verify)
 357         return crl->meth->crl_verify(crl, r);
 358     return 0;
 359 }
 360
 361 int X509_CRL_get0_by_serial(X509_CRL *crl,
 362                             X509_REVOKED **ret, const ASN1_INTEGER *serial)
 363 {
 364     if (crl->meth->crl_lookup)
 365         return crl->meth->crl_lookup(crl, ret, serial, NULL);
 366     return 0;
 367 }
 368
 369 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
 370 {
 371     if (crl->meth->crl_lookup)
 372         return crl->meth->crl_lookup(crl, ret,
 373                                      X509_get_serialNumber(x),
 374                                      X509_get_issuer_name(x));
 375     return 0;
 376 }
 377
 378 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
 379 {
 380     return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
 381                              &crl->sig_alg, &crl->signature, &crl->crl, r));
 382 }
 383
 384 static int crl_revoked_issuer_match(X509_CRL *crl, const X509_NAME *nm,
 385                                     X509_REVOKED *rev)
 386 {
 387     int i;
 388
 389     if (!rev->issuer) {
 390         if (!nm)
 391             return 1;
 392         if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
 393             return 1;
 394         return 0;
 395     }
 396
 397     if (!nm)
 398         nm = X509_CRL_get_issuer(crl);
 399
 400     for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
 401         GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
 402         if (gen->type != GEN_DIRNAME)
 403             continue;
 404         if (!X509_NAME_cmp(nm, gen->d.directoryName))
 405             return 1;
 406     }
 407     return 0;
 408
 409 }
 410
 411 static int def_crl_lookup(X509_CRL *crl,
 412                           X509_REVOKED **ret, const ASN1_INTEGER *serial,
 413                           const X509_NAME *issuer)
 414 {
 415     X509_REVOKED rtmp, *rev;
 416     int idx, num;
 417
 418     if (crl->crl.revoked == NULL)
 419         return 0;
 420
 421     /*
 422      * Sort revoked into serial number order if not already sorted. Do this
 423      * under a lock to avoid race condition.
 424      */
 425     if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
 426         CRYPTO_THREAD_write_lock(crl->lock);
 427         sk_X509_REVOKED_sort(crl->crl.revoked);
 428         CRYPTO_THREAD_unlock(crl->lock);
 429     }
 430     rtmp.serialNumber = *serial;
 431     idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
 432     if (idx < 0)
 433         return 0;
 434     /* Need to look for matching name */
 435     for (num = sk_X509_REVOKED_num(crl->crl.revoked); idx < num; idx++) {
 436         rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
 437         if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
 438             return 0;
 439         if (crl_revoked_issuer_match(crl, issuer, rev)) {
 440             if (ret)
 441                 *ret = rev;
 442             if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
 443                 return 2;
 444             return 1;
 445         }
 446     }
 447     return 0;
 448 }
 449
 450 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
 451 {
 452     if (meth == NULL)
 453         default_crl_method = &int_crl_meth;
 454     else
 455         default_crl_method = meth;
 456 }
 457
 458 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
 459                                      int (*crl_free) (X509_CRL *crl),
 460                                      int (*crl_lookup) (X509_CRL *crl,
 461                                                         X509_REVOKED **ret,
 462                                                         const ASN1_INTEGER *ser,
 463                                                         const X509_NAME *issuer),
 464                                      int (*crl_verify) (X509_CRL *crl,
 465                                                         EVP_PKEY *pk))
 466 {
 467     X509_CRL_METHOD *m = OPENSSL_malloc(sizeof(*m));
 468
 469     if (m == NULL) {
 470         X509err(X509_F_X509_CRL_METHOD_NEW, ERR_R_MALLOC_FAILURE);
 471         return NULL;
 472     }
 473     m->crl_init = crl_init;
 474     m->crl_free = crl_free;
 475     m->crl_lookup = crl_lookup;
 476     m->crl_verify = crl_verify;
 477     m->flags = X509_CRL_METHOD_DYNAMIC;
 478     return m;
 479 }
 480
 481 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
 482 {
 483     if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC))
 484         return;
 485     OPENSSL_free(m);
 486 }
 487
 488 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
 489 {
 490     crl->meth_data = dat;
 491 }
 492
 493 void *X509_CRL_get_meth_data(X509_CRL *crl)
 494 {
 495     return crl->meth_data;
 496 }