crypto/x509/x_crl.c

   1 /*
   2  * Copyright 1995-2021 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 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
  19                             const X509_REVOKED *const *b);
  20 static int 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, const ASN1_INTEGER *serial,
  31                           const 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 or set EXFLAG_NO_FINGERPRINT if this fails.
 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, i;
 159
 160     switch (operation) {
 161     case ASN1_OP_D2I_PRE:
 162         if (crl->meth->crl_free) {
 163             if (!crl->meth->crl_free(crl))
 164                 return 0;
 165         }
 166         AUTHORITY_KEYID_free(crl->akid);
 167         ISSUING_DIST_POINT_free(crl->idp);
 168         ASN1_INTEGER_free(crl->crl_number);
 169         ASN1_INTEGER_free(crl->base_crl_number);
 170         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 171         /* fall thru */
 172
 173     case ASN1_OP_NEW_POST:
 174         crl->idp = NULL;
 175         crl->akid = NULL;
 176         crl->flags = 0;
 177         crl->idp_flags = 0;
 178         crl->idp_reasons = CRLDP_ALL_REASONS;
 179         crl->meth = default_crl_method;
 180         crl->meth_data = NULL;
 181         crl->issuers = NULL;
 182         crl->crl_number = NULL;
 183         crl->base_crl_number = NULL;
 184         break;
 185
 186     case ASN1_OP_D2I_POST:
 187         if (!X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL))
 188             crl->flags |= EXFLAG_NO_FINGERPRINT;
 189         crl->idp = X509_CRL_get_ext_d2i(crl,
 190                                         NID_issuing_distribution_point, &i,
 191                                         NULL);
 192         if (crl->idp != NULL) {
 193             if (!setup_idp(crl, crl->idp))
 194                 crl->flags |= EXFLAG_INVALID;
 195         }
 196         else if (i != -1) {
 197             crl->flags |= EXFLAG_INVALID;
 198         }
 199
 200         crl->akid = X509_CRL_get_ext_d2i(crl,
 201                                          NID_authority_key_identifier, &i,
 202                                          NULL);
 203         if (crl->akid == NULL && i != -1)
 204             crl->flags |= EXFLAG_INVALID;
 205
 206         crl->crl_number = X509_CRL_get_ext_d2i(crl,
 207                                                NID_crl_number, &i, NULL);
 208         if (crl->crl_number == NULL && i != -1)
 209             crl->flags |= EXFLAG_INVALID;
 210
 211         crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
 212                                                     NID_delta_crl, &i,
 213                                                     NULL);
 214         if (crl->base_crl_number == NULL && i != -1)
 215             crl->flags |= EXFLAG_INVALID;
 216         /* Delta CRLs must have CRL number */
 217         if (crl->base_crl_number && !crl->crl_number)
 218             crl->flags |= EXFLAG_INVALID;
 219
 220         /*
 221          * See if we have any unhandled critical CRL extensions and indicate
 222          * this in a flag. We only currently handle IDP so anything else
 223          * critical sets the flag. This code accesses the X509_CRL structure
 224          * directly: applications shouldn't do this.
 225          */
 226
 227         exts = crl->crl.extensions;
 228
 229         for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
 230             int nid;
 231             ext = sk_X509_EXTENSION_value(exts, idx);
 232             nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
 233             if (nid == NID_freshest_crl)
 234                 crl->flags |= EXFLAG_FRESHEST;
 235             if (X509_EXTENSION_get_critical(ext)) {
 236                 /* We handle IDP and deltas */
 237                 if ((nid == NID_issuing_distribution_point)
 238                     || (nid == NID_authority_key_identifier)
 239                     || (nid == NID_delta_crl))
 240                     continue;
 241                 crl->flags |= EXFLAG_CRITICAL;
 242                 break;
 243             }
 244         }
 245
 246         if (!crl_set_issuers(crl))
 247             return 0;
 248
 249         if (crl->meth->crl_init) {
 250             if (crl->meth->crl_init(crl) == 0)
 251                 return 0;
 252         }
 253
 254         crl->flags |= EXFLAG_SET;
 255         break;
 256
 257     case ASN1_OP_FREE_POST:
 258         if (crl->meth->crl_free) {
 259             if (!crl->meth->crl_free(crl))
 260                 return 0;
 261         }
 262         AUTHORITY_KEYID_free(crl->akid);
 263         ISSUING_DIST_POINT_free(crl->idp);
 264         ASN1_INTEGER_free(crl->crl_number);
 265         ASN1_INTEGER_free(crl->base_crl_number);
 266         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 267         OPENSSL_free(crl->propq);
 268         break;
 269     case ASN1_OP_DUP_POST:
 270         {
 271             X509_CRL *old = exarg;
 272
 273             if (!ossl_x509_crl_set0_libctx(crl, old->libctx, old->propq))
 274                 return 0;
 275         }
 276         break;
 277     }
 278     return 1;
 279 }
 280
 281 /* Convert IDP into a more convenient form */
 282
 283 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
 284 {
 285     int idp_only = 0;
 286
 287     /* Set various flags according to IDP */
 288     crl->idp_flags |= IDP_PRESENT;
 289     if (idp->onlyuser > 0) {
 290         idp_only++;
 291         crl->idp_flags |= IDP_ONLYUSER;
 292     }
 293     if (idp->onlyCA > 0) {
 294         idp_only++;
 295         crl->idp_flags |= IDP_ONLYCA;
 296     }
 297     if (idp->onlyattr > 0) {
 298         idp_only++;
 299         crl->idp_flags |= IDP_ONLYATTR;
 300     }
 301
 302     if (idp_only > 1)
 303         crl->idp_flags |= IDP_INVALID;
 304
 305     if (idp->indirectCRL > 0)
 306         crl->idp_flags |= IDP_INDIRECT;
 307
 308     if (idp->onlysomereasons) {
 309         crl->idp_flags |= IDP_REASONS;
 310         if (idp->onlysomereasons->length > 0)
 311             crl->idp_reasons = idp->onlysomereasons->data[0];
 312         if (idp->onlysomereasons->length > 1)
 313             crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
 314         crl->idp_reasons &= CRLDP_ALL_REASONS;
 315     }
 316
 317     return DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
 318 }
 319
 320 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
 321         ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
 322         ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
 323         ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
 324 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
 325
 326 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 327
 328 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
 329
 330 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 331
 332 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 333
 334 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 335
 336 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
 337                             const X509_REVOKED *const *b)
 338 {
 339     return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
 340                             (ASN1_STRING *)&(*b)->serialNumber));
 341 }
 342
 343 X509_CRL *X509_CRL_new_ex(OSSL_LIB_CTX *libctx, const char *propq)
 344 {
 345     X509_CRL *crl = NULL;
 346
 347     crl = (X509_CRL *)ASN1_item_new((X509_CRL_it()));
 348     if (!ossl_x509_crl_set0_libctx(crl, libctx, propq)) {
 349         X509_CRL_free(crl);
 350         crl = NULL;
 351     }
 352     return crl;
 353 }
 354
 355 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
 356 {
 357     X509_CRL_INFO *inf;
 358
 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         ERR_raise(ERR_LIB_ASN1, 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, const 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_get0_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_ex(ASN1_ITEM_rptr(X509_CRL_INFO),
 397                                &crl->sig_alg, &crl->signature, &crl->crl, NULL,
 398                                r, crl->libctx, crl->propq);
 399 }
 400
 401 static int crl_revoked_issuer_match(X509_CRL *crl, const 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, const ASN1_INTEGER *serial,
 430                           const X509_NAME *issuer)
 431 {
 432     X509_REVOKED rtmp, *rev;
 433     int idx, num;
 434
 435     if (crl->crl.revoked == NULL)
 436         return 0;
 437
 438     /*
 439      * Sort revoked into serial number order if not already sorted. Do this
 440      * under a lock to avoid race condition.
 441      */
 442     if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
 443         if (!CRYPTO_THREAD_write_lock(crl->lock))
 444             return 0;
 445         sk_X509_REVOKED_sort(crl->crl.revoked);
 446         CRYPTO_THREAD_unlock(crl->lock);
 447     }
 448     rtmp.serialNumber = *serial;
 449     idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
 450     if (idx < 0)
 451         return 0;
 452     /* Need to look for matching name */
 453     for (num = sk_X509_REVOKED_num(crl->crl.revoked); idx < num; idx++) {
 454         rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
 455         if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
 456             return 0;
 457         if (crl_revoked_issuer_match(crl, issuer, rev)) {
 458             if (ret)
 459                 *ret = rev;
 460             if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
 461                 return 2;
 462             return 1;
 463         }
 464     }
 465     return 0;
 466 }
 467
 468 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
 469 {
 470     if (meth == NULL)
 471         default_crl_method = &int_crl_meth;
 472     else
 473         default_crl_method = meth;
 474 }
 475
 476 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
 477                                      int (*crl_free) (X509_CRL *crl),
 478                                      int (*crl_lookup) (X509_CRL *crl,
 479                                                         X509_REVOKED **ret,
 480                                                         const ASN1_INTEGER *ser,
 481                                                         const X509_NAME *issuer),
 482                                      int (*crl_verify) (X509_CRL *crl,
 483                                                         EVP_PKEY *pk))
 484 {
 485     X509_CRL_METHOD *m = OPENSSL_malloc(sizeof(*m));
 486
 487     if (m == NULL) {
 488         ERR_raise(ERR_LIB_X509, ERR_R_MALLOC_FAILURE);
 489         return NULL;
 490     }
 491     m->crl_init = crl_init;
 492     m->crl_free = crl_free;
 493     m->crl_lookup = crl_lookup;
 494     m->crl_verify = crl_verify;
 495     m->flags = X509_CRL_METHOD_DYNAMIC;
 496     return m;
 497 }
 498
 499 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
 500 {
 501     if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC))
 502         return;
 503     OPENSSL_free(m);
 504 }
 505
 506 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
 507 {
 508     crl->meth_data = dat;
 509 }
 510
 511 void *X509_CRL_get_meth_data(X509_CRL *crl)
 512 {
 513     return crl->meth_data;
 514 }
 515
 516 int ossl_x509_crl_set0_libctx(X509_CRL *x, OSSL_LIB_CTX *libctx,
 517                               const char *propq)
 518 {
 519     if (x != NULL) {
 520         x->libctx = libctx;
 521         OPENSSL_free(x->propq);
 522         x->propq = NULL;
 523         if (propq != NULL) {
 524             x->propq = OPENSSL_strdup(propq);
 525             if (x->propq == NULL)
 526                 return 0;
 527         }
 528     }
 529     return 1;
 530 }