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
66 static int policy_data_cmp(const X509_POLICY_DATA **a,
67 const X509_POLICY_DATA **b);
68 static 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
policy_cache_create(X509 * x,CERTIFICATEPOLICIES * policies,int crit)75 static 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 if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
97 if (cache->anyPolicy) {
98 ret = -1;
99 goto bad_policy;
100 }
101 cache->anyPolicy = data;
102 } else if (sk_X509_POLICY_DATA_find(cache->data, NULL, data)) {
103 ret = -1;
104 goto bad_policy;
105 } else if (!sk_X509_POLICY_DATA_push(cache->data, data))
106 goto bad_policy;
107 data = NULL;
108 }
109 ret = 1;
110 bad_policy:
111 if (ret == -1)
112 x->ex_flags |= EXFLAG_INVALID_POLICY;
113 if (data)
114 policy_data_free(data);
115 sk_POLICYINFO_pop_free(policies, POLICYINFO_free);
116 if (ret <= 0) {
117 sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
118 cache->data = NULL;
119 }
120 return ret;
121 }
122
policy_cache_new(X509 * x)123 static int 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 cache = OPENSSL_malloc(sizeof(X509_POLICY_CACHE));
132 if (!cache)
133 return 0;
134 cache->anyPolicy = NULL;
135 cache->data = NULL;
136 cache->any_skip = -1;
137 cache->explicit_skip = -1;
138 cache->map_skip = -1;
139
140 x->policy_cache = cache;
141
142 /*
143 * Handle requireExplicitPolicy *first*. Need to process this even if we
144 * 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 /*
167 * If no CertificatePolicies extension or problem decoding then there is
168 * no point continuing because the valid policies will be 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
policy_cache_free(X509_POLICY_CACHE * cache)219 void 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 OPENSSL_free(cache);
228 }
229
230 /*
231 * g_x509_policy_cache_lock is used to protect against concurrent calls to
232 * |policy_cache_new|. Ideally this would be done with a |CRYPTO_once_t| in
233 * the |X509| structure, but |CRYPTO_once_t| isn't public.
234 */
235 static struct CRYPTO_STATIC_MUTEX g_x509_policy_cache_lock =
236 CRYPTO_STATIC_MUTEX_INIT;
237
policy_cache_set(X509 * x)238 const X509_POLICY_CACHE *policy_cache_set(X509 *x)
239 {
240 X509_POLICY_CACHE *cache;
241
242 CRYPTO_STATIC_MUTEX_lock_read(&g_x509_policy_cache_lock);
243 cache = x->policy_cache;
244 CRYPTO_STATIC_MUTEX_unlock_read(&g_x509_policy_cache_lock);
245
246 if (cache != NULL)
247 return cache;
248
249 CRYPTO_STATIC_MUTEX_lock_write(&g_x509_policy_cache_lock);
250 if (x->policy_cache == NULL)
251 policy_cache_new(x);
252 cache = x->policy_cache;
253 CRYPTO_STATIC_MUTEX_unlock_write(&g_x509_policy_cache_lock);
254
255 return cache;
256 }
257
policy_cache_find_data(const X509_POLICY_CACHE * cache,const ASN1_OBJECT * id)258 X509_POLICY_DATA *policy_cache_find_data(const X509_POLICY_CACHE *cache,
259 const ASN1_OBJECT *id)
260 {
261 size_t idx;
262 X509_POLICY_DATA tmp;
263
264 tmp.valid_policy = (ASN1_OBJECT *)id;
265 if (!sk_X509_POLICY_DATA_find(cache->data, &idx, &tmp))
266 return NULL;
267 return sk_X509_POLICY_DATA_value(cache->data, idx);
268 }
269
policy_data_cmp(const X509_POLICY_DATA ** a,const X509_POLICY_DATA ** b)270 static int policy_data_cmp(const X509_POLICY_DATA **a,
271 const X509_POLICY_DATA **b)
272 {
273 return OBJ_cmp((*a)->valid_policy, (*b)->valid_policy);
274 }
275
policy_cache_set_int(long * out,ASN1_INTEGER * value)276 static int policy_cache_set_int(long *out, ASN1_INTEGER *value)
277 {
278 if (value == NULL)
279 return 1;
280 if (value->type == V_ASN1_NEG_INTEGER)
281 return 0;
282 *out = ASN1_INTEGER_get(value);
283 return 1;
284 }
285