1 /*
2 * Copyright 2004-2023 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
17 static int policy_data_cmp(const X509_POLICY_DATA *const *a,
18 const X509_POLICY_DATA *const *b);
19 static 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
policy_cache_create(X509 * x,CERTIFICATEPOLICIES * policies,int crit)26 static 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 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
39 goto just_cleanup;
40 }
41 for (i = 0; i < num; i++) {
42 policy = sk_POLICYINFO_value(policies, i);
43 data = ossl_policy_data_new(policy, NULL, crit);
44 if (data == NULL) {
45 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
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 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
62 goto bad_policy;
63 }
64 data = NULL;
65 }
66 /* Sort so we can find more quickly */
67 sk_X509_POLICY_DATA_sort(cache->data);
68 ret = 1;
69
70 bad_policy:
71 if (ret == -1)
72 x->ex_flags |= EXFLAG_INVALID_POLICY;
73 ossl_policy_data_free(data);
74 just_cleanup:
75 sk_POLICYINFO_pop_free(policies, POLICYINFO_free);
76 if (ret <= 0) {
77 sk_X509_POLICY_DATA_pop_free(cache->data, ossl_policy_data_free);
78 cache->data = NULL;
79 }
80 return ret;
81 }
82
policy_cache_new(X509 * x)83 static int policy_cache_new(X509 *x)
84 {
85 X509_POLICY_CACHE *cache;
86 ASN1_INTEGER *ext_any = NULL;
87 POLICY_CONSTRAINTS *ext_pcons = NULL;
88 CERTIFICATEPOLICIES *ext_cpols = NULL;
89 POLICY_MAPPINGS *ext_pmaps = NULL;
90 int i;
91
92 if (x->policy_cache != NULL)
93 return 1;
94 cache = OPENSSL_malloc(sizeof(*cache));
95 if (cache == NULL)
96 return 0;
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 = ossl_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
ossl_policy_cache_free(X509_POLICY_CACHE * cache)178 void ossl_policy_cache_free(X509_POLICY_CACHE *cache)
179 {
180 if (!cache)
181 return;
182 ossl_policy_data_free(cache->anyPolicy);
183 sk_X509_POLICY_DATA_pop_free(cache->data, ossl_policy_data_free);
184 OPENSSL_free(cache);
185 }
186
ossl_policy_cache_set(X509 * x)187 const X509_POLICY_CACHE *ossl_policy_cache_set(X509 *x)
188 {
189
190 if (x->policy_cache == NULL) {
191 if (!CRYPTO_THREAD_write_lock(x->lock))
192 return NULL;
193 policy_cache_new(x);
194 CRYPTO_THREAD_unlock(x->lock);
195 }
196
197 return x->policy_cache;
198
199 }
200
ossl_policy_cache_find_data(const X509_POLICY_CACHE * cache,const ASN1_OBJECT * id)201 X509_POLICY_DATA *ossl_policy_cache_find_data(const X509_POLICY_CACHE *cache,
202 const ASN1_OBJECT *id)
203 {
204 int idx;
205 X509_POLICY_DATA tmp;
206 tmp.valid_policy = (ASN1_OBJECT *)id;
207 idx = sk_X509_POLICY_DATA_find(cache->data, &tmp);
208 return sk_X509_POLICY_DATA_value(cache->data, idx);
209 }
210
policy_data_cmp(const X509_POLICY_DATA * const * a,const X509_POLICY_DATA * const * b)211 static int policy_data_cmp(const X509_POLICY_DATA *const *a,
212 const X509_POLICY_DATA *const *b)
213 {
214 return OBJ_cmp((*a)->valid_policy, (*b)->valid_policy);
215 }
216
policy_cache_set_int(long * out,ASN1_INTEGER * value)217 static int policy_cache_set_int(long *out, ASN1_INTEGER *value)
218 {
219 if (value == NULL)
220 return 1;
221 if (value->type == V_ASN1_NEG_INTEGER)
222 return 0;
223 *out = ASN1_INTEGER_get(value);
224 return 1;
225 }
226
