lib/libcrypto/x509v3/pcy_cache.c

   1 /* $OpenBSD: pcy_cache.c,v 1.5 2014/07/11 08:44:49 jsing Exp $ */
   2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
   3  * project 2004.
   4  */
   5 /* ====================================================================
   6  * Copyright (c) 2004 The OpenSSL Project.  All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in
  17  *    the documentation and/or other materials provided with the
  18  *    distribution.
  19  *
  20  * 3. All advertising materials mentioning features or use of this
  21  *    software must display the following acknowledgment:
  22  *    "This product includes software developed by the OpenSSL Project
  23  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  24  *
  25  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  26  *    endorse or promote products derived from this software without
  27  *    prior written permission. For written permission, please contact
  28  *    licensing@OpenSSL.org.
  29  *
  30  * 5. Products derived from this software may not be called "OpenSSL"
  31  *    nor may "OpenSSL" appear in their names without prior written
  32  *    permission of the OpenSSL Project.
  33  *
  34  * 6. Redistributions of any form whatsoever must retain the following
  35  *    acknowledgment:
  36  *    "This product includes software developed by the OpenSSL Project
  37  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  38  *
  39  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  40  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  41  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  42  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  43  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  44  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  45  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  46  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  48  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  49  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  50  * OF THE POSSIBILITY OF SUCH DAMAGE.
  51  * ====================================================================
  52  *
  53  * This product includes cryptographic software written by Eric Young
  54  * (eay@cryptsoft.com).  This product includes software written by Tim
  55  * Hudson (tjh@cryptsoft.com).
  56  *
  57  */
  58
  59 #include <openssl/x509.h>
  60 #include <openssl/x509v3.h>
  61
  62 #include "pcy_int.h"
  63
  64 static int policy_data_cmp(const X509_POLICY_DATA * const *a,
  65     const X509_POLICY_DATA * const *b);
  66 static int policy_cache_set_int(long *out, ASN1_INTEGER *value);
  67
  68 /* Set cache entry according to CertificatePolicies extension.
  69  * Note: this destroys the passed CERTIFICATEPOLICIES structure.
  70  */
  71
  72 static int
  73 policy_cache_create(X509 *x, CERTIFICATEPOLICIES *policies, int crit)
  74 {
  75         int i;
  76         int ret = 0;
  77         X509_POLICY_CACHE *cache = x->policy_cache;
  78         X509_POLICY_DATA *data = NULL;
  79         POLICYINFO *policy;
  80
  81         if (sk_POLICYINFO_num(policies) == 0)
  82                 goto bad_policy;
  83         cache->data = sk_X509_POLICY_DATA_new(policy_data_cmp);
  84         if (!cache->data)
  85                 goto bad_policy;
  86         for (i = 0; i < sk_POLICYINFO_num(policies); i++) {
  87                 policy = sk_POLICYINFO_value(policies, i);
  88                 data = policy_data_new(policy, NULL, crit);
  89                 if (!data)
  90                         goto bad_policy;
  91                 /* Duplicate policy OIDs are illegal: reject if matches
  92                  * found.
  93                  */
  94                 if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
  95                         if (cache->anyPolicy) {
  96                                 ret = -1;
  97                                 goto bad_policy;
  98                         }
  99                         cache->anyPolicy = data;
 100                 } else if (sk_X509_POLICY_DATA_find(cache->data, data) != -1) {
 101                         ret = -1;
 102                         goto bad_policy;
 103                 } else if (!sk_X509_POLICY_DATA_push(cache->data, data))
 104                         goto bad_policy;
 105                 data = NULL;
 106         }
 107         ret = 1;
 108
 109 bad_policy:
 110         if (ret == -1)
 111                 x->ex_flags |= EXFLAG_INVALID_POLICY;
 112         if (data)
 113                 policy_data_free(data);
 114         sk_POLICYINFO_pop_free(policies, POLICYINFO_free);
 115         if (ret <= 0) {
 116                 sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
 117                 cache->data = NULL;
 118         }
 119         return ret;
 120 }
 121
 122 static int
 123 policy_cache_new(X509 *x)
 124 {
 125         X509_POLICY_CACHE *cache;
 126         ASN1_INTEGER *ext_any = NULL;
 127         POLICY_CONSTRAINTS *ext_pcons = NULL;
 128         CERTIFICATEPOLICIES *ext_cpols = NULL;
 129         POLICY_MAPPINGS *ext_pmaps = NULL;
 130         int i;
 131
 132         cache = malloc(sizeof(X509_POLICY_CACHE));
 133         if (!cache)
 134                 return 0;
 135         cache->anyPolicy = NULL;
 136         cache->data = NULL;
 137         cache->any_skip = -1;
 138         cache->explicit_skip = -1;
 139         cache->map_skip = -1;
 140
 141         x->policy_cache = cache;
 142
 143         /* Handle requireExplicitPolicy *first*. Need to process this
 144          * even if we don't have any policies.
 145          */
 146         ext_pcons = X509_get_ext_d2i(x, NID_policy_constraints, &i, NULL);
 147
 148         if (!ext_pcons) {
 149                 if (i != -1)
 150                         goto bad_cache;
 151         } else {
 152                 if (!ext_pcons->requireExplicitPolicy &&
 153                     !ext_pcons->inhibitPolicyMapping)
 154                         goto bad_cache;
 155                 if (!policy_cache_set_int(&cache->explicit_skip,
 156                     ext_pcons->requireExplicitPolicy))
 157                         goto bad_cache;
 158                 if (!policy_cache_set_int(&cache->map_skip,
 159                     ext_pcons->inhibitPolicyMapping))
 160                         goto bad_cache;
 161         }
 162
 163         /* Process CertificatePolicies */
 164
 165         ext_cpols = X509_get_ext_d2i(x, NID_certificate_policies, &i, NULL);
 166         /* If no CertificatePolicies extension or problem decoding then
 167          * there is no point continuing because the valid policies will be
 168          * NULL.
 169          */
 170         if (!ext_cpols) {
 171                 /* If not absent some problem with extension */
 172                 if (i != -1)
 173                         goto bad_cache;
 174                 return 1;
 175         }
 176
 177         i = policy_cache_create(x, ext_cpols, i);
 178
 179         /* NB: ext_cpols freed by policy_cache_set_policies */
 180
 181         if (i <= 0)
 182                 return i;
 183
 184         ext_pmaps = X509_get_ext_d2i(x, NID_policy_mappings, &i, NULL);
 185
 186         if (!ext_pmaps) {
 187                 /* If not absent some problem with extension */
 188                 if (i != -1)
 189                         goto bad_cache;
 190         } else {
 191                 i = policy_cache_set_mapping(x, ext_pmaps);
 192                 if (i <= 0)
 193                         goto bad_cache;
 194         }
 195
 196         ext_any = X509_get_ext_d2i(x, NID_inhibit_any_policy, &i, NULL);
 197
 198         if (!ext_any) {
 199                 if (i != -1)
 200                         goto bad_cache;
 201         } else if (!policy_cache_set_int(&cache->any_skip, ext_any))
 202                 goto bad_cache;
 203
 204         if (0) {
 205 bad_cache:
 206                 x->ex_flags |= EXFLAG_INVALID_POLICY;
 207         }
 208
 209         if (ext_pcons)
 210                 POLICY_CONSTRAINTS_free(ext_pcons);
 211
 212         if (ext_any)
 213                 ASN1_INTEGER_free(ext_any);
 214
 215         return 1;
 216 }
 217
 218 void
 219 policy_cache_free(X509_POLICY_CACHE *cache)
 220 {
 221         if (!cache)
 222                 return;
 223         if (cache->anyPolicy)
 224                 policy_data_free(cache->anyPolicy);
 225         if (cache->data)
 226                 sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
 227         free(cache);
 228 }
 229
 230 const X509_POLICY_CACHE *
 231 policy_cache_set(X509 *x)
 232 {
 233         if (x->policy_cache == NULL) {
 234                 CRYPTO_w_lock(CRYPTO_LOCK_X509);
 235                 policy_cache_new(x);
 236                 CRYPTO_w_unlock(CRYPTO_LOCK_X509);
 237         }
 238
 239         return x->policy_cache;
 240 }
 241
 242 X509_POLICY_DATA *
 243 policy_cache_find_data(const X509_POLICY_CACHE *cache, const ASN1_OBJECT *id)
 244 {
 245         int idx;
 246         X509_POLICY_DATA tmp;
 247
 248         tmp.valid_policy = (ASN1_OBJECT *)id;
 249         idx = sk_X509_POLICY_DATA_find(cache->data, &tmp);
 250         if (idx == -1)
 251                 return NULL;
 252         return sk_X509_POLICY_DATA_value(cache->data, idx);
 253 }
 254
 255 static int
 256 policy_data_cmp(const X509_POLICY_DATA * const *a,
 257     const X509_POLICY_DATA * const *b)
 258 {
 259         return OBJ_cmp((*a)->valid_policy, (*b)->valid_policy);
 260 }
 261
 262 static int
 263 policy_cache_set_int(long *out, ASN1_INTEGER *value)
 264 {
 265         if (value == NULL)
 266                 return 1;
 267         if (value->type == V_ASN1_NEG_INTEGER)
 268                 return 0;
 269         *out = ASN1_INTEGER_get(value);
 270         return 1;
 271 }