1/*
2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 * 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#include <openssl/mem.h>
58#include <openssl/obj.h>
59#include <openssl/thread.h>
60#include <openssl/x509.h>
61#include <openssl/x509v3.h>
62
63#include "pcy_int.h"
64#include "../internal.h"
65
66static int policy_data_cmp(const X509_POLICY_DATA **a,
67 const X509_POLICY_DATA **b);
68static int policy_cache_set_int(long *out, ASN1_INTEGER *value);
69
70/*
71 * Set cache entry according to CertificatePolicies extension. Note: this
72 * destroys the passed CERTIFICATEPOLICIES structure.
73 */
74
75static int policy_cache_create(X509 *x,
76 CERTIFICATEPOLICIES *policies, int crit)
77{
78 size_t i;
79 int ret = 0;
80 X509_POLICY_CACHE *cache = x->policy_cache;
81 X509_POLICY_DATA *data = NULL;
82 POLICYINFO *policy;
83 if (sk_POLICYINFO_num(policies) == 0)
84 goto bad_policy;
85 cache->data = sk_X509_POLICY_DATA_new(policy_data_cmp);
86 if (!cache->data)
87 goto bad_policy;
88 for (i = 0; i < sk_POLICYINFO_num(policies); i++) {
89 policy = sk_POLICYINFO_value(policies, i);
90 data = policy_data_new(policy, NULL, crit);
91 if (!data)
92 goto bad_policy;
93 /*
94 * Duplicate policy OIDs are illegal: reject if matches found.
95 */
96 sk_X509_POLICY_DATA_sort(cache->data);
97 if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
98 if (cache->anyPolicy) {
99 ret = -1;
100 goto bad_policy;
101 }
102 cache->anyPolicy = data;
103 } else if (sk_X509_POLICY_DATA_find(cache->data, NULL, data)) {
104 ret = -1;
105 goto bad_policy;
106 } else if (!sk_X509_POLICY_DATA_push(cache->data, data))
107 goto bad_policy;
108 data = NULL;
109 }
110 ret = 1;
111 bad_policy:
112 if (ret == -1)
113 x->ex_flags |= EXFLAG_INVALID_POLICY;
114 if (data)
115 policy_data_free(data);
116 sk_POLICYINFO_pop_free(policies, POLICYINFO_free);
117 if (ret <= 0) {
118 sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
119 cache->data = NULL;
120 }
121 return ret;
122}
123
124static int policy_cache_new(X509 *x)
125{
126 X509_POLICY_CACHE *cache;
127 ASN1_INTEGER *ext_any = NULL;
128 POLICY_CONSTRAINTS *ext_pcons = NULL;
129 CERTIFICATEPOLICIES *ext_cpols = NULL;
130 POLICY_MAPPINGS *ext_pmaps = NULL;
131 int i;
132 cache = OPENSSL_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 /*
144 * Handle requireExplicitPolicy *first*. Need to process this even if we
145 * don't have any policies.
146 */
147 ext_pcons = X509_get_ext_d2i(x, NID_policy_constraints, &i, NULL);
148
149 if (!ext_pcons) {
150 if (i != -1)
151 goto bad_cache;
152 } else {
153 if (!ext_pcons->requireExplicitPolicy
154 && !ext_pcons->inhibitPolicyMapping)
155 goto bad_cache;
156 if (!policy_cache_set_int(&cache->explicit_skip,
157 ext_pcons->requireExplicitPolicy))
158 goto bad_cache;
159 if (!policy_cache_set_int(&cache->map_skip,
160 ext_pcons->inhibitPolicyMapping))
161 goto bad_cache;
162 }
163
164 /* Process CertificatePolicies */
165
166 ext_cpols = X509_get_ext_d2i(x, NID_certificate_policies, &i, NULL);
167 /*
168 * If no CertificatePolicies extension or problem decoding then there is
169 * no point continuing because the valid policies will be NULL.
170 */
171 if (!ext_cpols) {
172 /* If not absent some problem with extension */
173 if (i != -1)
174 goto bad_cache;
175 return 1;
176 }
177
178 i = policy_cache_create(x, ext_cpols, i);
179
180 /* NB: ext_cpols freed by policy_cache_set_policies */
181
182 if (i <= 0)
183 return i;
184
185 ext_pmaps = X509_get_ext_d2i(x, NID_policy_mappings, &i, NULL);
186
187 if (!ext_pmaps) {
188 /* If not absent some problem with extension */
189 if (i != -1)
190 goto bad_cache;
191 } else {
192 i = policy_cache_set_mapping(x, ext_pmaps);
193 if (i <= 0)
194 goto bad_cache;
195 }
196
197 ext_any = X509_get_ext_d2i(x, NID_inhibit_any_policy, &i, NULL);
198
199 if (!ext_any) {
200 if (i != -1)
201 goto bad_cache;
202 } else if (!policy_cache_set_int(&cache->any_skip, ext_any))
203 goto bad_cache;
204
205 if (0) {
206 bad_cache:
207 x->ex_flags |= EXFLAG_INVALID_POLICY;
208 }
209
210 if (ext_pcons)
211 POLICY_CONSTRAINTS_free(ext_pcons);
212
213 if (ext_any)
214 ASN1_INTEGER_free(ext_any);
215
216 return 1;
217
218}
219
220void policy_cache_free(X509_POLICY_CACHE *cache)
221{
222 if (!cache)
223 return;
224 if (cache->anyPolicy)
225 policy_data_free(cache->anyPolicy);
226 if (cache->data)
227 sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
228 OPENSSL_free(cache);
229}
230
231/*
232 * g_x509_policy_cache_lock is used to protect against concurrent calls to
233 * |policy_cache_new|. Ideally this would be done with a |CRYPTO_once_t| in
234 * the |X509| structure, but |CRYPTO_once_t| isn't public.
235 */
236static struct CRYPTO_STATIC_MUTEX g_x509_policy_cache_lock =
237 CRYPTO_STATIC_MUTEX_INIT;
238
239const X509_POLICY_CACHE *policy_cache_set(X509 *x)
240{
241 X509_POLICY_CACHE *cache;
242
243 CRYPTO_STATIC_MUTEX_lock_read(&g_x509_policy_cache_lock);
244 cache = x->policy_cache;
245 CRYPTO_STATIC_MUTEX_unlock_read(&g_x509_policy_cache_lock);
246
247 if (cache != NULL)
248 return cache;
249
250 CRYPTO_STATIC_MUTEX_lock_write(&g_x509_policy_cache_lock);
251 if (x->policy_cache == NULL)
252 policy_cache_new(x);
253 cache = x->policy_cache;
254 CRYPTO_STATIC_MUTEX_unlock_write(&g_x509_policy_cache_lock);
255
256 return cache;
257}
258
259X509_POLICY_DATA *policy_cache_find_data(const X509_POLICY_CACHE *cache,
260 const ASN1_OBJECT *id)
261{
262 size_t idx;
263 X509_POLICY_DATA tmp;
264
265 tmp.valid_policy = (ASN1_OBJECT *)id;
266 sk_X509_POLICY_DATA_sort(cache->data);
267 if (!sk_X509_POLICY_DATA_find(cache->data, &idx, &tmp))
268 return NULL;
269 return sk_X509_POLICY_DATA_value(cache->data, idx);
270}
271
272static int policy_data_cmp(const X509_POLICY_DATA **a,
273 const X509_POLICY_DATA **b)
274{
275 return OBJ_cmp((*a)->valid_policy, (*b)->valid_policy);
276}
277
278static int policy_cache_set_int(long *out, ASN1_INTEGER *value)
279{
280 if (value == NULL)
281 return 1;
282 if (value->type == V_ASN1_NEG_INTEGER)
283 return 0;
284 *out = ASN1_INTEGER_get(value);
285 return 1;
286}
287