1 /*
2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
3 * 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 #include <openssl/buf.h>
58 #include <openssl/err.h>
59 #include <openssl/mem.h>
60 #include <openssl/obj.h>
61 #include <openssl/x509v3.h>
62
63 static int tr_cmp(const X509_TRUST **a, const X509_TRUST **b);
64 static void trtable_free(X509_TRUST *p);
65
66 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
67 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
68 static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
69
70 static int obj_trust(int id, X509 *x, int flags);
71 static int (*default_trust) (int id, X509 *x, int flags) = obj_trust;
72
73 /*
74 * WARNING: the following table should be kept in order of trust and without
75 * any gaps so we can just subtract the minimum trust value to get an index
76 * into the table
77 */
78
79 static X509_TRUST trstandard[] = {
80 {X509_TRUST_COMPAT, 0, trust_compat, (char *)"compatible", 0, NULL},
81 {X509_TRUST_SSL_CLIENT, 0, trust_1oidany, (char *)"SSL Client",
82 NID_client_auth, NULL},
83 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, (char *)"SSL Server",
84 NID_server_auth, NULL},
85 {X509_TRUST_EMAIL, 0, trust_1oidany, (char *)"S/MIME email",
86 NID_email_protect, NULL},
87 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, (char *)"Object Signer",
88 NID_code_sign, NULL},
89 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, (char *)"OCSP responder",
90 NID_OCSP_sign, NULL},
91 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, (char *)"OCSP request",
92 NID_ad_OCSP, NULL},
93 {X509_TRUST_TSA, 0, trust_1oidany, (char *)"TSA server", NID_time_stamp,
94 NULL}
95 };
96
97 #define X509_TRUST_COUNT (sizeof(trstandard)/sizeof(X509_TRUST))
98
99 static STACK_OF(X509_TRUST) *trtable = NULL;
100
tr_cmp(const X509_TRUST ** a,const X509_TRUST ** b)101 static int tr_cmp(const X509_TRUST **a, const X509_TRUST **b)
102 {
103 return (*a)->trust - (*b)->trust;
104 }
105
X509_TRUST_set_default(int (* trust)(int,X509 *,int))106 int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *,
107 int) {
108 int (*oldtrust) (int, X509 *, int);
109 oldtrust = default_trust;
110 default_trust = trust;
111 return oldtrust;
112 }
113
X509_check_trust(X509 * x,int id,int flags)114 int X509_check_trust(X509 *x, int id, int flags)
115 {
116 X509_TRUST *pt;
117 int idx;
118 if (id == -1)
119 return 1;
120 /* We get this as a default value */
121 if (id == 0) {
122 int rv;
123 rv = obj_trust(NID_anyExtendedKeyUsage, x, 0);
124 if (rv != X509_TRUST_UNTRUSTED)
125 return rv;
126 return trust_compat(NULL, x, 0);
127 }
128 idx = X509_TRUST_get_by_id(id);
129 if (idx == -1)
130 return default_trust(id, x, flags);
131 pt = X509_TRUST_get0(idx);
132 return pt->check_trust(pt, x, flags);
133 }
134
X509_TRUST_get_count(void)135 int X509_TRUST_get_count(void)
136 {
137 if (!trtable)
138 return X509_TRUST_COUNT;
139 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
140 }
141
X509_TRUST_get0(int idx)142 X509_TRUST *X509_TRUST_get0(int idx)
143 {
144 if (idx < 0)
145 return NULL;
146 if (idx < (int)X509_TRUST_COUNT)
147 return trstandard + idx;
148 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
149 }
150
X509_TRUST_get_by_id(int id)151 int X509_TRUST_get_by_id(int id)
152 {
153 X509_TRUST tmp;
154 size_t idx;
155
156 if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
157 return id - X509_TRUST_MIN;
158 tmp.trust = id;
159 if (!trtable)
160 return -1;
161 sk_X509_TRUST_sort(trtable);
162 if (!sk_X509_TRUST_find(trtable, &idx, &tmp)) {
163 return -1;
164 }
165 return idx + X509_TRUST_COUNT;
166 }
167
X509_TRUST_set(int * t,int trust)168 int X509_TRUST_set(int *t, int trust)
169 {
170 if (X509_TRUST_get_by_id(trust) == -1) {
171 OPENSSL_PUT_ERROR(X509, X509_R_INVALID_TRUST);
172 return 0;
173 }
174 *t = trust;
175 return 1;
176 }
177
X509_TRUST_add(int id,int flags,int (* ck)(X509_TRUST *,X509 *,int),char * name,int arg1,void * arg2)178 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
179 char *name, int arg1, void *arg2)
180 {
181 int idx;
182 X509_TRUST *trtmp;
183 char *name_dup;
184
185 /*
186 * This is set according to what we change: application can't set it
187 */
188 flags &= ~X509_TRUST_DYNAMIC;
189 /* This will always be set for application modified trust entries */
190 flags |= X509_TRUST_DYNAMIC_NAME;
191 /* Get existing entry if any */
192 idx = X509_TRUST_get_by_id(id);
193 /* Need a new entry */
194 if (idx == -1) {
195 if (!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
196 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
197 return 0;
198 }
199 trtmp->flags = X509_TRUST_DYNAMIC;
200 } else
201 trtmp = X509_TRUST_get0(idx);
202
203 /* Duplicate the supplied name. */
204 name_dup = BUF_strdup(name);
205 if (name_dup == NULL) {
206 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
207 if (idx == -1)
208 OPENSSL_free(trtmp);
209 return 0;
210 }
211
212 /* OPENSSL_free existing name if dynamic */
213 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
214 OPENSSL_free(trtmp->name);
215 trtmp->name = name_dup;
216 /* Keep the dynamic flag of existing entry */
217 trtmp->flags &= X509_TRUST_DYNAMIC;
218 /* Set all other flags */
219 trtmp->flags |= flags;
220
221 trtmp->trust = id;
222 trtmp->check_trust = ck;
223 trtmp->arg1 = arg1;
224 trtmp->arg2 = arg2;
225
226 /* If its a new entry manage the dynamic table */
227 if (idx == -1) {
228 if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
229 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
230 trtable_free(trtmp);
231 return 0;
232 }
233 if (!sk_X509_TRUST_push(trtable, trtmp)) {
234 OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
235 trtable_free(trtmp);
236 return 0;
237 }
238 }
239 return 1;
240 }
241
trtable_free(X509_TRUST * p)242 static void trtable_free(X509_TRUST *p)
243 {
244 if (!p)
245 return;
246 if (p->flags & X509_TRUST_DYNAMIC) {
247 if (p->flags & X509_TRUST_DYNAMIC_NAME)
248 OPENSSL_free(p->name);
249 OPENSSL_free(p);
250 }
251 }
252
X509_TRUST_cleanup(void)253 void X509_TRUST_cleanup(void)
254 {
255 unsigned int i;
256 for (i = 0; i < X509_TRUST_COUNT; i++)
257 trtable_free(trstandard + i);
258 sk_X509_TRUST_pop_free(trtable, trtable_free);
259 trtable = NULL;
260 }
261
X509_TRUST_get_flags(X509_TRUST * xp)262 int X509_TRUST_get_flags(X509_TRUST *xp)
263 {
264 return xp->flags;
265 }
266
X509_TRUST_get0_name(X509_TRUST * xp)267 char *X509_TRUST_get0_name(X509_TRUST *xp)
268 {
269 return xp->name;
270 }
271
X509_TRUST_get_trust(X509_TRUST * xp)272 int X509_TRUST_get_trust(X509_TRUST *xp)
273 {
274 return xp->trust;
275 }
276
trust_1oidany(X509_TRUST * trust,X509 * x,int flags)277 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
278 {
279 if (x->aux && (x->aux->trust || x->aux->reject))
280 return obj_trust(trust->arg1, x, flags);
281 /*
282 * we don't have any trust settings: for compatibility we return trusted
283 * if it is self signed
284 */
285 return trust_compat(trust, x, flags);
286 }
287
trust_1oid(X509_TRUST * trust,X509 * x,int flags)288 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
289 {
290 if (x->aux)
291 return obj_trust(trust->arg1, x, flags);
292 return X509_TRUST_UNTRUSTED;
293 }
294
trust_compat(X509_TRUST * trust,X509 * x,int flags)295 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
296 {
297 X509_check_purpose(x, -1, 0);
298 if (x->ex_flags & EXFLAG_SS)
299 return X509_TRUST_TRUSTED;
300 else
301 return X509_TRUST_UNTRUSTED;
302 }
303
obj_trust(int id,X509 * x,int flags)304 static int obj_trust(int id, X509 *x, int flags)
305 {
306 ASN1_OBJECT *obj;
307 size_t i;
308 X509_CERT_AUX *ax;
309 ax = x->aux;
310 if (!ax)
311 return X509_TRUST_UNTRUSTED;
312 if (ax->reject) {
313 for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
314 obj = sk_ASN1_OBJECT_value(ax->reject, i);
315 if (OBJ_obj2nid(obj) == id)
316 return X509_TRUST_REJECTED;
317 }
318 }
319 if (ax->trust) {
320 for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
321 obj = sk_ASN1_OBJECT_value(ax->trust, i);
322 if (OBJ_obj2nid(obj) == id)
323 return X509_TRUST_TRUSTED;
324 }
325 }
326 return X509_TRUST_UNTRUSTED;
327 }
328