1 /* x509_trs.c */
2 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 1999.
4 */
5 /* ====================================================================
6 * Copyright (c) 1999 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 <stdio.h>
60 #include "cryptlib.h"
61 #include <openssl/x509v3.h>
62
63
64 static int tr_cmp(const X509_TRUST * const *a,
65 const X509_TRUST * const *b);
66 static void trtable_free(X509_TRUST *p);
67
68 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
69 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
70 static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
71
72 static int obj_trust(int id, X509 *x, int flags);
73 static int (*default_trust)(int id, X509 *x, int flags) = obj_trust;
74
75 /* WARNING: the following table should be kept in order of trust
76 * and without any gaps so we can just subtract the minimum trust
77 * value to get an index into the table
78 */
79
80 static X509_TRUST trstandard[] = {
81 {X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
82 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL},
83 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth, NULL},
84 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL},
85 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign, NULL},
86 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL},
87 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL},
88 {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
89 };
90
91 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST))
92
93 IMPLEMENT_STACK_OF(X509_TRUST)
94
95 static STACK_OF(X509_TRUST) *trtable = NULL;
96
97 static int tr_cmp(const X509_TRUST * const *a,
98 const X509_TRUST * const *b)
99 {
100 return (*a)->trust - (*b)->trust;
101 }
102
103 int (*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
104 {
105 int (*oldtrust)(int , X509 *, int);
106 oldtrust = default_trust;
107 default_trust = trust;
108 return oldtrust;
109 }
110
111
112 int X509_check_trust(X509 *x, int id, int flags)
113 {
114 X509_TRUST *pt;
115 int idx;
116 if(id == -1) return 1;
117 idx = X509_TRUST_get_by_id(id);
118 if(idx == -1) return default_trust(id, x, flags);
119 pt = X509_TRUST_get0(idx);
120 return pt->check_trust(pt, x, flags);
121 }
122
123 int X509_TRUST_get_count(void)
124 {
125 if(!trtable) return X509_TRUST_COUNT;
126 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
127 }
128
129 X509_TRUST * X509_TRUST_get0(int idx)
130 {
131 if(idx < 0) return NULL;
132 if(idx < (int)X509_TRUST_COUNT) return trstandard + idx;
133 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
134 }
135
136 int X509_TRUST_get_by_id(int id)
137 {
138 X509_TRUST tmp;
139 int idx;
140 if((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
141 return id - X509_TRUST_MIN;
142 tmp.trust = id;
143 if(!trtable) return -1;
144 idx = sk_X509_TRUST_find(trtable, &tmp);
145 if(idx == -1) return -1;
146 return idx + X509_TRUST_COUNT;
147 }
148
149 int X509_TRUST_set(int *t, int trust)
150 {
151 if(X509_TRUST_get_by_id(trust) == -1) {
152 X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
153 return 0;
154 }
155 *t = trust;
156 return 1;
157 }
158
159 int X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
160 char *name, int arg1, void *arg2)
161 {
162 int idx;
163 X509_TRUST *trtmp;
164 /* This is set according to what we change: application can't set it */
165 flags &= ~X509_TRUST_DYNAMIC;
166 /* This will always be set for application modified trust entries */
167 flags |= X509_TRUST_DYNAMIC_NAME;
168 /* Get existing entry if any */
169 idx = X509_TRUST_get_by_id(id);
170 /* Need a new entry */
171 if(idx == -1) {
172 if(!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
173 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
174 return 0;
175 }
176 trtmp->flags = X509_TRUST_DYNAMIC;
177 } else trtmp = X509_TRUST_get0(idx);
178
179 /* OPENSSL_free existing name if dynamic */
180 if(trtmp->flags & X509_TRUST_DYNAMIC_NAME) OPENSSL_free(trtmp->name);
181 /* dup supplied name */
182 if(!(trtmp->name = BUF_strdup(name))) {
183 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
184 return 0;
185 }
186 /* Keep the dynamic flag of existing entry */
187 trtmp->flags &= X509_TRUST_DYNAMIC;
188 /* Set all other flags */
189 trtmp->flags |= flags;
190
191 trtmp->trust = id;
192 trtmp->check_trust = ck;
193 trtmp->arg1 = arg1;
194 trtmp->arg2 = arg2;
195
196 /* If its a new entry manage the dynamic table */
197 if(idx == -1) {
198 if(!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
199 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
200 return 0;
201 }
202 if (!sk_X509_TRUST_push(trtable, trtmp)) {
203 X509err(X509_F_X509_TRUST_ADD,ERR_R_MALLOC_FAILURE);
204 return 0;
205 }
206 }
207 return 1;
208 }
209
210 static void trtable_free(X509_TRUST *p)
211 {
212 if(!p) return;
213 if (p->flags & X509_TRUST_DYNAMIC)
214 {
215 if (p->flags & X509_TRUST_DYNAMIC_NAME)
216 OPENSSL_free(p->name);
217 OPENSSL_free(p);
218 }
219 }
220
221 void X509_TRUST_cleanup(void)
222 {
223 unsigned int i;
224 for(i = 0; i < X509_TRUST_COUNT; i++) trtable_free(trstandard + i);
225 sk_X509_TRUST_pop_free(trtable, trtable_free);
226 trtable = NULL;
227 }
228
229 int X509_TRUST_get_flags(X509_TRUST *xp)
230 {
231 return xp->flags;
232 }
233
234 char *X509_TRUST_get0_name(X509_TRUST *xp)
235 {
236 return xp->name;
237 }
238
239 int X509_TRUST_get_trust(X509_TRUST *xp)
240 {
241 return xp->trust;
242 }
243
244 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
245 {
246 if(x->aux && (x->aux->trust || x->aux->reject))
247 return obj_trust(trust->arg1, x, flags);
248 /* we don't have any trust settings: for compatibility
249 * we return trusted if it is self signed
250 */
251 return trust_compat(trust, x, flags);
252 }
253
254 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
255 {
256 if(x->aux) return obj_trust(trust->arg1, x, flags);
257 return X509_TRUST_UNTRUSTED;
258 }
259
260 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
261 {
262 X509_check_purpose(x, -1, 0);
263 if(x->ex_flags & EXFLAG_SS) return X509_TRUST_TRUSTED;
264 else return X509_TRUST_UNTRUSTED;
265 }
266
267 static int obj_trust(int id, X509 *x, int flags)
268 {
269 ASN1_OBJECT *obj;
270 int i;
271 X509_CERT_AUX *ax;
272 ax = x->aux;
273 if(!ax) return X509_TRUST_UNTRUSTED;
274 if(ax->reject) {
275 for(i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
276 obj = sk_ASN1_OBJECT_value(ax->reject, i);
277 if(OBJ_obj2nid(obj) == id) return X509_TRUST_REJECTED;
278 }
279 }
280 if(ax->trust) {
281 for(i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
282 obj = sk_ASN1_OBJECT_value(ax->trust, i);
283 if(OBJ_obj2nid(obj) == id) return X509_TRUST_TRUSTED;
284 }
285 }
286 return X509_TRUST_UNTRUSTED;
287 }