1/*
2 * Copyright 2004-2018 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 "internal/cryptlib.h"
11#include <openssl/x509.h>
12#include <openssl/x509v3.h>
13#include "crypto/x509.h"
14
15#include "pcy_local.h"
16
17static int policy_data_cmp(const X509_POLICY_DATA *const *a,
18 const X509_POLICY_DATA *const *b);
19static int policy_cache_set_int(long *out, ASN1_INTEGER *value);
20
21/*
22 * Set cache entry according to CertificatePolicies extension. Note: this
23 * destroys the passed CERTIFICATEPOLICIES structure.
24 */
25
26static int policy_cache_create(X509 *x,
27 CERTIFICATEPOLICIES *policies, int crit)
28{
29 int i, num, ret = 0;
30 X509_POLICY_CACHE *cache = x->policy_cache;
31 X509_POLICY_DATA *data = NULL;
32 POLICYINFO *policy;
33
34 if ((num = sk_POLICYINFO_num(policies)) <= 0)
35 goto bad_policy;
36 cache->data = sk_X509_POLICY_DATA_new(policy_data_cmp);
37 if (cache->data == NULL) {
38 X509V3err(X509V3_F_POLICY_CACHE_CREATE, ERR_R_MALLOC_FAILURE);
39 goto just_cleanup;
40 }
41 for (i = 0; i < num; i++) {
42 policy = sk_POLICYINFO_value(policies, i);
43 data = policy_data_new(policy, NULL, crit);
44 if (data == NULL) {
45 X509V3err(X509V3_F_POLICY_CACHE_CREATE, ERR_R_MALLOC_FAILURE);
46 goto just_cleanup;
47 }
48 /*
49 * Duplicate policy OIDs are illegal: reject if matches found.
50 */
51 if (OBJ_obj2nid(data->valid_policy) == NID_any_policy) {
52 if (cache->anyPolicy) {
53 ret = -1;
54 goto bad_policy;
55 }
56 cache->anyPolicy = data;
57 } else if (sk_X509_POLICY_DATA_find(cache->data, data) >=0 ) {
58 ret = -1;
59 goto bad_policy;
60 } else if (!sk_X509_POLICY_DATA_push(cache->data, data)) {
61 X509V3err(X509V3_F_POLICY_CACHE_CREATE, ERR_R_MALLOC_FAILURE);
62 goto bad_policy;
63 }
64 data = NULL;
65 }
66 ret = 1;
67
68 bad_policy:
69 if (ret == -1)
70 x->ex_flags |= EXFLAG_INVALID_POLICY;
71 policy_data_free(data);
72 just_cleanup:
73 sk_POLICYINFO_pop_free(policies, POLICYINFO_free);
74 if (ret <= 0) {
75 sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
76 cache->data = NULL;
77 }
78 return ret;
79}
80
81static int policy_cache_new(X509 *x)
82{
83 X509_POLICY_CACHE *cache;
84 ASN1_INTEGER *ext_any = NULL;
85 POLICY_CONSTRAINTS *ext_pcons = NULL;
86 CERTIFICATEPOLICIES *ext_cpols = NULL;
87 POLICY_MAPPINGS *ext_pmaps = NULL;
88 int i;
89
90 if (x->policy_cache != NULL)
91 return 1;
92 cache = OPENSSL_malloc(sizeof(*cache));
93 if (cache == NULL) {
94 X509V3err(X509V3_F_POLICY_CACHE_NEW, ERR_R_MALLOC_FAILURE);
95 return 0;
96 }
97 cache->anyPolicy = NULL;
98 cache->data = NULL;
99 cache->any_skip = -1;
100 cache->explicit_skip = -1;
101 cache->map_skip = -1;
102
103 x->policy_cache = cache;
104
105 /*
106 * Handle requireExplicitPolicy *first*. Need to process this even if we
107 * don't have any policies.
108 */
109 ext_pcons = X509_get_ext_d2i(x, NID_policy_constraints, &i, NULL);
110
111 if (!ext_pcons) {
112 if (i != -1)
113 goto bad_cache;
114 } else {
115 if (!ext_pcons->requireExplicitPolicy
116 && !ext_pcons->inhibitPolicyMapping)
117 goto bad_cache;
118 if (!policy_cache_set_int(&cache->explicit_skip,
119 ext_pcons->requireExplicitPolicy))
120 goto bad_cache;
121 if (!policy_cache_set_int(&cache->map_skip,
122 ext_pcons->inhibitPolicyMapping))
123 goto bad_cache;
124 }
125
126 /* Process CertificatePolicies */
127
128 ext_cpols = X509_get_ext_d2i(x, NID_certificate_policies, &i, NULL);
129 /*
130 * If no CertificatePolicies extension or problem decoding then there is
131 * no point continuing because the valid policies will be NULL.
132 */
133 if (!ext_cpols) {
134 /* If not absent some problem with extension */
135 if (i != -1)
136 goto bad_cache;
137 return 1;
138 }
139
140 i = policy_cache_create(x, ext_cpols, i);
141
142 /* NB: ext_cpols freed by policy_cache_set_policies */
143
144 if (i <= 0)
145 return i;
146
147 ext_pmaps = X509_get_ext_d2i(x, NID_policy_mappings, &i, NULL);
148
149 if (!ext_pmaps) {
150 /* If not absent some problem with extension */
151 if (i != -1)
152 goto bad_cache;
153 } else {
154 i = policy_cache_set_mapping(x, ext_pmaps);
155 if (i <= 0)
156 goto bad_cache;
157 }
158
159 ext_any = X509_get_ext_d2i(x, NID_inhibit_any_policy, &i, NULL);
160
161 if (!ext_any) {
162 if (i != -1)
163 goto bad_cache;
164 } else if (!policy_cache_set_int(&cache->any_skip, ext_any))
165 goto bad_cache;
166 goto just_cleanup;
167
168 bad_cache:
169 x->ex_flags |= EXFLAG_INVALID_POLICY;
170
171 just_cleanup:
172 POLICY_CONSTRAINTS_free(ext_pcons);
173 ASN1_INTEGER_free(ext_any);
174 return 1;
175
176}
177
178void policy_cache_free(X509_POLICY_CACHE *cache)
179{
180 if (!cache)
181 return;
182 policy_data_free(cache->anyPolicy);
183 sk_X509_POLICY_DATA_pop_free(cache->data, policy_data_free);
184 OPENSSL_free(cache);
185}
186
187const X509_POLICY_CACHE *policy_cache_set(X509 *x)
188{
189
190 if (x->policy_cache == NULL) {
191 CRYPTO_THREAD_write_lock(x->lock);
192 policy_cache_new(x);
193 CRYPTO_THREAD_unlock(x->lock);
194 }
195
196 return x->policy_cache;
197
198}
199
200X509_POLICY_DATA *policy_cache_find_data(const X509_POLICY_CACHE *cache,
201 const ASN1_OBJECT *id)
202{
203 int idx;
204 X509_POLICY_DATA tmp;
205 tmp.valid_policy = (ASN1_OBJECT *)id;
206 idx = sk_X509_POLICY_DATA_find(cache->data, &tmp);
207 return sk_X509_POLICY_DATA_value(cache->data, idx);
208}
209
210static int policy_data_cmp(const X509_POLICY_DATA *const *a,
211 const X509_POLICY_DATA *const *b)
212{
213 return OBJ_cmp((*a)->valid_policy, (*b)->valid_policy);
214}
215
216static int policy_cache_set_int(long *out, ASN1_INTEGER *value)
217{
218 if (value == NULL)
219 return 1;
220 if (value->type == V_ASN1_NEG_INTEGER)
221 return 0;
222 *out = ASN1_INTEGER_get(value);
223 return 1;
224}
225