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
  21 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
  22                             const X509_REVOKED *const *b);
  23 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
  24
  25 ASN1_SEQUENCE(X509_REVOKED) = {
  26         ASN1_EMBED(X509_REVOKED,serialNumber, ASN1_INTEGER),
  27         ASN1_SIMPLE(X509_REVOKED,revocationDate, ASN1_TIME),
  28         ASN1_SEQUENCE_OF_OPT(X509_REVOKED,extensions, X509_EXTENSION)
  29 } ASN1_SEQUENCE_END(X509_REVOKED)
  30
  31 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r);
  32 static int def_crl_lookup(X509_CRL *crl,
  33                           X509_REVOKED **ret, const ASN1_INTEGER *serial,
  34                           const X509_NAME *issuer);
  35
  36 static X509_CRL_METHOD int_crl_meth = {
  37     0,
  38     0, 0,
  39     def_crl_lookup,
  40     def_crl_verify
  41 };
  42
  43 static const X509_CRL_METHOD *default_crl_method = &int_crl_meth;
  44
  45 /*
  46  * The X509_CRL_INFO structure needs a bit of customisation. Since we cache
  47  * the original encoding the signature won't be affected by reordering of the
  48  * revoked field.
  49  */
  50 static int crl_inf_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
  51                       void *exarg)
  52 {
  53     X509_CRL_INFO *a = (X509_CRL_INFO *)*pval;
  54
  55     if (!a || !a->revoked)
  56         return 1;
  57     switch (operation) {
  58         /*
  59          * Just set cmp function here. We don't sort because that would
  60          * affect the output of X509_CRL_print().
  61          */
  62     case ASN1_OP_D2I_POST:
  63         (void)sk_X509_REVOKED_set_cmp_func(a->revoked, X509_REVOKED_cmp);
  64         break;
  65     }
  66     return 1;
  67 }
  68
  69
  70 ASN1_SEQUENCE_enc(X509_CRL_INFO, enc, crl_inf_cb) = {
  71         ASN1_OPT(X509_CRL_INFO, version, ASN1_INTEGER),
  72         ASN1_EMBED(X509_CRL_INFO, sig_alg, X509_ALGOR),
  73         ASN1_SIMPLE(X509_CRL_INFO, issuer, X509_NAME),
  74         ASN1_SIMPLE(X509_CRL_INFO, lastUpdate, ASN1_TIME),
  75         ASN1_OPT(X509_CRL_INFO, nextUpdate, ASN1_TIME),
  76         ASN1_SEQUENCE_OF_OPT(X509_CRL_INFO, revoked, X509_REVOKED),
  77         ASN1_EXP_SEQUENCE_OF_OPT(X509_CRL_INFO, extensions, X509_EXTENSION, 0)
  78 } ASN1_SEQUENCE_END_enc(X509_CRL_INFO, X509_CRL_INFO)
  79
  80 /*
  81  * Set CRL entry issuer according to CRL certificate issuer extension. Check
  82  * for unhandled critical CRL entry extensions.
  83  */
  84
  85 static int crl_set_issuers(X509_CRL *crl)
  86 {
  87
  88     int i, j;
  89     GENERAL_NAMES *gens, *gtmp;
  90     STACK_OF(X509_REVOKED) *revoked;
  91
  92     revoked = X509_CRL_get_REVOKED(crl);
  93
  94     gens = NULL;
  95     for (i = 0; i < sk_X509_REVOKED_num(revoked); i++) {
  96         X509_REVOKED *rev = sk_X509_REVOKED_value(revoked, i);
  97         STACK_OF(X509_EXTENSION) *exts;
  98         ASN1_ENUMERATED *reason;
  99         X509_EXTENSION *ext;
 100         gtmp = X509_REVOKED_get_ext_d2i(rev,
 101                                         NID_certificate_issuer, &j, NULL);
 102         if (!gtmp && (j != -1)) {
 103             crl->flags |= EXFLAG_INVALID;
 104             return 1;
 105         }
 106
 107         if (gtmp) {
 108             gens = gtmp;
 109             if (!crl->issuers) {
 110                 crl->issuers = sk_GENERAL_NAMES_new_null();
 111                 if (!crl->issuers)
 112                     return 0;
 113             }
 114             if (!sk_GENERAL_NAMES_push(crl->issuers, gtmp))
 115                 return 0;
 116         }
 117         rev->issuer = gens;
 118
 119         reason = X509_REVOKED_get_ext_d2i(rev, NID_crl_reason, &j, NULL);
 120         if (!reason && (j != -1)) {
 121             crl->flags |= EXFLAG_INVALID;
 122             return 1;
 123         }
 124
 125         if (reason) {
 126             rev->reason = ASN1_ENUMERATED_get(reason);
 127             ASN1_ENUMERATED_free(reason);
 128         } else
 129             rev->reason = CRL_REASON_NONE;
 130
 131         /* Check for critical CRL entry extensions */
 132
 133         exts = rev->extensions;
 134
 135         for (j = 0; j < sk_X509_EXTENSION_num(exts); j++) {
 136             ext = sk_X509_EXTENSION_value(exts, j);
 137             if (X509_EXTENSION_get_critical(ext)) {
 138                 if (OBJ_obj2nid(X509_EXTENSION_get_object(ext)) == NID_certificate_issuer)
 139                     continue;
 140                 crl->flags |= EXFLAG_CRITICAL;
 141                 break;
 142             }
 143         }
 144
 145     }
 146
 147     return 1;
 148
 149 }
 150
 151 /*
 152  * The X509_CRL structure needs a bit of customisation. Cache some extensions
 153  * and hash of the whole CRL.
 154  */
 155 static int crl_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
 156                   void *exarg)
 157 {
 158     X509_CRL *crl = (X509_CRL *)*pval;
 159     STACK_OF(X509_EXTENSION) *exts;
 160     X509_EXTENSION *ext;
 161     int idx, i;
 162
 163     switch (operation) {
 164     case ASN1_OP_D2I_PRE:
 165         if (crl->meth->crl_free) {
 166             if (!crl->meth->crl_free(crl))
 167                 return 0;
 168         }
 169         AUTHORITY_KEYID_free(crl->akid);
 170         ISSUING_DIST_POINT_free(crl->idp);
 171         ASN1_INTEGER_free(crl->crl_number);
 172         ASN1_INTEGER_free(crl->base_crl_number);
 173         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 174         /* fall thru */
 175
 176     case ASN1_OP_NEW_POST:
 177         crl->idp = NULL;
 178         crl->akid = NULL;
 179         crl->flags = 0;
 180         crl->idp_flags = 0;
 181         crl->idp_reasons = CRLDP_ALL_REASONS;
 182         crl->meth = default_crl_method;
 183         crl->meth_data = NULL;
 184         crl->issuers = NULL;
 185         crl->crl_number = NULL;
 186         crl->base_crl_number = NULL;
 187         break;
 188
 189     case ASN1_OP_D2I_POST:
 190         if (!X509_CRL_digest(crl, EVP_sha1(), crl->sha1_hash, NULL))
 191             crl->flags |= EXFLAG_INVALID;
 192         crl->idp = X509_CRL_get_ext_d2i(crl,
 193                                         NID_issuing_distribution_point, &i,
 194                                         NULL);
 195         if (crl->idp != NULL) {
 196             if (!setup_idp(crl, crl->idp))
 197                 crl->flags |= EXFLAG_INVALID;
 198         }
 199         else if (i != -1) {
 200             crl->flags |= EXFLAG_INVALID;
 201         }
 202
 203         crl->akid = X509_CRL_get_ext_d2i(crl,
 204                                          NID_authority_key_identifier, &i,
 205                                          NULL);
 206         if (crl->akid == NULL && i != -1)
 207             crl->flags |= EXFLAG_INVALID;
 208
 209         crl->crl_number = X509_CRL_get_ext_d2i(crl,
 210                                                NID_crl_number, &i, NULL);
 211         if (crl->crl_number == NULL && i != -1)
 212             crl->flags |= EXFLAG_INVALID;
 213
 214         crl->base_crl_number = X509_CRL_get_ext_d2i(crl,
 215                                                     NID_delta_crl, &i,
 216                                                     NULL);
 217         if (crl->base_crl_number == NULL && i != -1)
 218             crl->flags |= EXFLAG_INVALID;
 219         /* Delta CRLs must have CRL number */
 220         if (crl->base_crl_number && !crl->crl_number)
 221             crl->flags |= EXFLAG_INVALID;
 222
 223         /*
 224          * See if we have any unhandled critical CRL extensions and indicate
 225          * this in a flag. We only currently handle IDP so anything else
 226          * critical sets the flag. This code accesses the X509_CRL structure
 227          * directly: applications shouldn't do this.
 228          */
 229
 230         exts = crl->crl.extensions;
 231
 232         for (idx = 0; idx < sk_X509_EXTENSION_num(exts); idx++) {
 233             int nid;
 234             ext = sk_X509_EXTENSION_value(exts, idx);
 235             nid = OBJ_obj2nid(X509_EXTENSION_get_object(ext));
 236             if (nid == NID_freshest_crl)
 237                 crl->flags |= EXFLAG_FRESHEST;
 238             if (X509_EXTENSION_get_critical(ext)) {
 239                 /* We handle IDP and deltas */
 240                 if ((nid == NID_issuing_distribution_point)
 241                     || (nid == NID_authority_key_identifier)
 242                     || (nid == NID_delta_crl))
 243                     continue;
 244                 crl->flags |= EXFLAG_CRITICAL;
 245                 break;
 246             }
 247         }
 248
 249         if (!crl_set_issuers(crl))
 250             return 0;
 251
 252         if (crl->meth->crl_init) {
 253             if (crl->meth->crl_init(crl) == 0)
 254                 return 0;
 255         }
 256
 257         crl->flags |= EXFLAG_SET;
 258         break;
 259
 260     case ASN1_OP_FREE_POST:
 261         if (crl->meth->crl_free) {
 262             if (!crl->meth->crl_free(crl))
 263                 return 0;
 264         }
 265         AUTHORITY_KEYID_free(crl->akid);
 266         ISSUING_DIST_POINT_free(crl->idp);
 267         ASN1_INTEGER_free(crl->crl_number);
 268         ASN1_INTEGER_free(crl->base_crl_number);
 269         sk_GENERAL_NAMES_pop_free(crl->issuers, GENERAL_NAMES_free);
 270         break;
 271     }
 272     return 1;
 273 }
 274
 275 /* Convert IDP into a more convenient form */
 276
 277 static int setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp)
 278 {
 279     int idp_only = 0;
 280
 281     /* Set various flags according to IDP */
 282     crl->idp_flags |= IDP_PRESENT;
 283     if (idp->onlyuser > 0) {
 284         idp_only++;
 285         crl->idp_flags |= IDP_ONLYUSER;
 286     }
 287     if (idp->onlyCA > 0) {
 288         idp_only++;
 289         crl->idp_flags |= IDP_ONLYCA;
 290     }
 291     if (idp->onlyattr > 0) {
 292         idp_only++;
 293         crl->idp_flags |= IDP_ONLYATTR;
 294     }
 295
 296     if (idp_only > 1)
 297         crl->idp_flags |= IDP_INVALID;
 298
 299     if (idp->indirectCRL > 0)
 300         crl->idp_flags |= IDP_INDIRECT;
 301
 302     if (idp->onlysomereasons) {
 303         crl->idp_flags |= IDP_REASONS;
 304         if (idp->onlysomereasons->length > 0)
 305             crl->idp_reasons = idp->onlysomereasons->data[0];
 306         if (idp->onlysomereasons->length > 1)
 307             crl->idp_reasons |= (idp->onlysomereasons->data[1] << 8);
 308         crl->idp_reasons &= CRLDP_ALL_REASONS;
 309     }
 310
 311     return DIST_POINT_set_dpname(idp->distpoint, X509_CRL_get_issuer(crl));
 312 }
 313
 314 ASN1_SEQUENCE_ref(X509_CRL, crl_cb) = {
 315         ASN1_EMBED(X509_CRL, crl, X509_CRL_INFO),
 316         ASN1_EMBED(X509_CRL, sig_alg, X509_ALGOR),
 317         ASN1_EMBED(X509_CRL, signature, ASN1_BIT_STRING)
 318 } ASN1_SEQUENCE_END_ref(X509_CRL, X509_CRL)
 319
 320 IMPLEMENT_ASN1_FUNCTIONS(X509_REVOKED)
 321
 322 IMPLEMENT_ASN1_DUP_FUNCTION(X509_REVOKED)
 323
 324 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL_INFO)
 325
 326 IMPLEMENT_ASN1_FUNCTIONS(X509_CRL)
 327
 328 IMPLEMENT_ASN1_DUP_FUNCTION(X509_CRL)
 329
 330 static int X509_REVOKED_cmp(const X509_REVOKED *const *a,
 331                             const X509_REVOKED *const *b)
 332 {
 333     return (ASN1_STRING_cmp((ASN1_STRING *)&(*a)->serialNumber,
 334                             (ASN1_STRING *)&(*b)->serialNumber));
 335 }
 336
 337 int X509_CRL_add0_revoked(X509_CRL *crl, X509_REVOKED *rev)
 338 {
 339     X509_CRL_INFO *inf;
 340
 341     inf = &crl->crl;
 342     if (inf->revoked == NULL)
 343         inf->revoked = sk_X509_REVOKED_new(X509_REVOKED_cmp);
 344     if (inf->revoked == NULL || !sk_X509_REVOKED_push(inf->revoked, rev)) {
 345         ASN1err(ASN1_F_X509_CRL_ADD0_REVOKED, ERR_R_MALLOC_FAILURE);
 346         return 0;
 347     }
 348     inf->enc.modified = 1;
 349     return 1;
 350 }
 351
 352 int X509_CRL_verify(X509_CRL *crl, EVP_PKEY *r)
 353 {
 354     if (crl->meth->crl_verify)
 355         return crl->meth->crl_verify(crl, r);
 356     return 0;
 357 }
 358
 359 int X509_CRL_get0_by_serial(X509_CRL *crl,
 360                             X509_REVOKED **ret, const ASN1_INTEGER *serial)
 361 {
 362     if (crl->meth->crl_lookup)
 363         return crl->meth->crl_lookup(crl, ret, serial, NULL);
 364     return 0;
 365 }
 366
 367 int X509_CRL_get0_by_cert(X509_CRL *crl, X509_REVOKED **ret, X509 *x)
 368 {
 369     if (crl->meth->crl_lookup)
 370         return crl->meth->crl_lookup(crl, ret,
 371                                      X509_get0_serialNumber(x),
 372                                      X509_get_issuer_name(x));
 373     return 0;
 374 }
 375
 376 static int def_crl_verify(X509_CRL *crl, EVP_PKEY *r)
 377 {
 378     return (ASN1_item_verify(ASN1_ITEM_rptr(X509_CRL_INFO),
 379                              &crl->sig_alg, &crl->signature, &crl->crl, r));
 380 }
 381
 382 static int crl_revoked_issuer_match(X509_CRL *crl, const X509_NAME *nm,
 383                                     X509_REVOKED *rev)
 384 {
 385     int i;
 386
 387     if (!rev->issuer) {
 388         if (!nm)
 389             return 1;
 390         if (!X509_NAME_cmp(nm, X509_CRL_get_issuer(crl)))
 391             return 1;
 392         return 0;
 393     }
 394
 395     if (!nm)
 396         nm = X509_CRL_get_issuer(crl);
 397
 398     for (i = 0; i < sk_GENERAL_NAME_num(rev->issuer); i++) {
 399         GENERAL_NAME *gen = sk_GENERAL_NAME_value(rev->issuer, i);
 400         if (gen->type != GEN_DIRNAME)
 401             continue;
 402         if (!X509_NAME_cmp(nm, gen->d.directoryName))
 403             return 1;
 404     }
 405     return 0;
 406
 407 }
 408
 409 static int def_crl_lookup(X509_CRL *crl,
 410                           X509_REVOKED **ret, const ASN1_INTEGER *serial,
 411                           const X509_NAME *issuer)
 412 {
 413     X509_REVOKED rtmp, *rev;
 414     int idx, num;
 415
 416     if (crl->crl.revoked == NULL)
 417         return 0;
 418
 419     /*
 420      * Sort revoked into serial number order if not already sorted. Do this
 421      * under a lock to avoid race condition.
 422      */
 423     if (!sk_X509_REVOKED_is_sorted(crl->crl.revoked)) {
 424         CRYPTO_THREAD_write_lock(crl->lock);
 425         sk_X509_REVOKED_sort(crl->crl.revoked);
 426         CRYPTO_THREAD_unlock(crl->lock);
 427     }
 428     rtmp.serialNumber = *serial;
 429     idx = sk_X509_REVOKED_find(crl->crl.revoked, &rtmp);
 430     if (idx < 0)
 431         return 0;
 432     /* Need to look for matching name */
 433     for (num = sk_X509_REVOKED_num(crl->crl.revoked); idx < num; idx++) {
 434         rev = sk_X509_REVOKED_value(crl->crl.revoked, idx);
 435         if (ASN1_INTEGER_cmp(&rev->serialNumber, serial))
 436             return 0;
 437         if (crl_revoked_issuer_match(crl, issuer, rev)) {
 438             if (ret)
 439                 *ret = rev;
 440             if (rev->reason == CRL_REASON_REMOVE_FROM_CRL)
 441                 return 2;
 442             return 1;
 443         }
 444     }
 445     return 0;
 446 }
 447
 448 void X509_CRL_set_default_method(const X509_CRL_METHOD *meth)
 449 {
 450     if (meth == NULL)
 451         default_crl_method = &int_crl_meth;
 452     else
 453         default_crl_method = meth;
 454 }
 455
 456 X509_CRL_METHOD *X509_CRL_METHOD_new(int (*crl_init) (X509_CRL *crl),
 457                                      int (*crl_free) (X509_CRL *crl),
 458                                      int (*crl_lookup) (X509_CRL *crl,
 459                                                         X509_REVOKED **ret,
 460                                                         const ASN1_INTEGER *ser,
 461                                                         const X509_NAME *issuer),
 462                                      int (*crl_verify) (X509_CRL *crl,
 463                                                         EVP_PKEY *pk))
 464 {
 465     X509_CRL_METHOD *m = OPENSSL_malloc(sizeof(*m));
 466
 467     if (m == NULL) {
 468         X509err(X509_F_X509_CRL_METHOD_NEW, ERR_R_MALLOC_FAILURE);
 469         return NULL;
 470     }
 471     m->crl_init = crl_init;
 472     m->crl_free = crl_free;
 473     m->crl_lookup = crl_lookup;
 474     m->crl_verify = crl_verify;
 475     m->flags = X509_CRL_METHOD_DYNAMIC;
 476     return m;
 477 }
 478
 479 void X509_CRL_METHOD_free(X509_CRL_METHOD *m)
 480 {
 481     if (m == NULL || !(m->flags & X509_CRL_METHOD_DYNAMIC))
 482         return;
 483     OPENSSL_free(m);
 484 }
 485
 486 void X509_CRL_set_meth_data(X509_CRL *crl, void *dat)
 487 {
 488     crl->meth_data = dat;
 489 }
 490
 491 void *X509_CRL_get_meth_data(X509_CRL *crl)
 492 {
 493     return crl->meth_data;
 494 }
 495
 496 int x509_crl_set0_libctx(X509_CRL *x, OPENSSL_CTX *libctx, const char *propq)
 497 {
 498     if (x != NULL) {
 499         x->libctx = libctx;
 500         x->propq = propq;
 501     }
 502     return 1;
 503 }