2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 1999 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 #include "internal/cryptlib.h"
61 #include <openssl/x509v3.h>
62 #include "internal/x509_int.h"
64 static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b);
65 static void trtable_free(X509_TRUST *p);
67 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
68 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
69 static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
71 static int obj_trust(int id, X509 *x, int flags);
72 static int (*default_trust) (int id, X509 *x, int flags) = obj_trust;
75 * WARNING: the following table should be kept in order of trust and without
76 * any gaps so we can just subtract the minimum trust value to get an index
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,
84 {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth,
86 {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect,
88 {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign,
90 {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign,
92 {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP,
94 {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
97 #define X509_TRUST_COUNT OSSL_NELEM(trstandard)
99 static STACK_OF(X509_TRUST) *trtable = NULL;
101 static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b)
103 return (*a)->trust - (*b)->trust;
106 int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *,
108 int (*oldtrust) (int, X509 *, int);
109 oldtrust = default_trust;
110 default_trust = trust;
114 int X509_check_trust(X509 *x, int id, int flags)
119 /* We get this as a default value */
120 if (id == X509_TRUST_DEFAULT)
121 return obj_trust(NID_anyExtendedKeyUsage, x,
122 flags | X509_TRUST_DO_SS_COMPAT);
123 idx = X509_TRUST_get_by_id(id);
125 return default_trust(id, x, flags);
126 pt = X509_TRUST_get0(idx);
127 return pt->check_trust(pt, x, flags);
130 int X509_TRUST_get_count(void)
133 return X509_TRUST_COUNT;
134 return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
137 X509_TRUST *X509_TRUST_get0(int idx)
141 if (idx < (int)X509_TRUST_COUNT)
142 return trstandard + idx;
143 return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
146 int X509_TRUST_get_by_id(int id)
150 if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
151 return id - X509_TRUST_MIN;
155 idx = sk_X509_TRUST_find(trtable, &tmp);
158 return idx + X509_TRUST_COUNT;
161 int X509_TRUST_set(int *t, int trust)
163 if (X509_TRUST_get_by_id(trust) == -1) {
164 X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
171 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
172 char *name, int arg1, void *arg2)
177 * This is set according to what we change: application can't set it
179 flags &= ~X509_TRUST_DYNAMIC;
180 /* This will always be set for application modified trust entries */
181 flags |= X509_TRUST_DYNAMIC_NAME;
182 /* Get existing entry if any */
183 idx = X509_TRUST_get_by_id(id);
184 /* Need a new entry */
186 if ((trtmp = OPENSSL_malloc(sizeof(*trtmp))) == NULL) {
187 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
190 trtmp->flags = X509_TRUST_DYNAMIC;
192 trtmp = X509_TRUST_get0(idx);
194 /* OPENSSL_free existing name if dynamic */
195 if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
196 OPENSSL_free(trtmp->name);
197 /* dup supplied name */
198 if ((trtmp->name = OPENSSL_strdup(name)) == NULL) {
199 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
202 /* Keep the dynamic flag of existing entry */
203 trtmp->flags &= X509_TRUST_DYNAMIC;
204 /* Set all other flags */
205 trtmp->flags |= flags;
208 trtmp->check_trust = ck;
212 /* If its a new entry manage the dynamic table */
215 && (trtable = sk_X509_TRUST_new(tr_cmp)) == NULL) {
216 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
219 if (!sk_X509_TRUST_push(trtable, trtmp)) {
220 X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
227 static void trtable_free(X509_TRUST *p)
231 if (p->flags & X509_TRUST_DYNAMIC) {
232 if (p->flags & X509_TRUST_DYNAMIC_NAME)
233 OPENSSL_free(p->name);
238 void X509_TRUST_cleanup(void)
241 for (i = 0; i < X509_TRUST_COUNT; i++)
242 trtable_free(trstandard + i);
243 sk_X509_TRUST_pop_free(trtable, trtable_free);
247 int X509_TRUST_get_flags(X509_TRUST *xp)
252 char *X509_TRUST_get0_name(X509_TRUST *xp)
257 int X509_TRUST_get_trust(X509_TRUST *xp)
262 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
265 * Declare the chain verified if the desired trust OID is not rejected in
266 * any auxiliary trust info for this certificate, and the OID is either
267 * expressly trusted, or else either "anyEKU" is trusted, or the
268 * certificate is self-signed.
270 flags |= X509_TRUST_DO_SS_COMPAT | X509_TRUST_OK_ANY_EKU;
271 return obj_trust(trust->arg1, x, flags);
274 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
277 * Declare the chain verified only if the desired trust OID is not
278 * rejected and is expressly trusted. Neither "anyEKU" nor "compat"
279 * trust in self-signed certificates apply.
281 flags &= ~(X509_TRUST_DO_SS_COMPAT | X509_TRUST_OK_ANY_EKU);
282 return obj_trust(trust->arg1, x, flags);
285 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
287 /* Call for side-effect of computing hash and caching extensions */
288 X509_check_purpose(x, -1, 0);
289 if ((flags & X509_TRUST_NO_SS_COMPAT) == 0 && x->ex_flags & EXFLAG_SS)
290 return X509_TRUST_TRUSTED;
292 return X509_TRUST_UNTRUSTED;
295 static int obj_trust(int id, X509 *x, int flags)
297 X509_CERT_AUX *ax = x->aux;
300 if (ax && ax->reject) {
301 for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
302 ASN1_OBJECT *obj = sk_ASN1_OBJECT_value(ax->reject, i);
303 int nid = OBJ_obj2nid(obj);
305 if (nid == id || (nid == NID_anyExtendedKeyUsage &&
306 (flags & X509_TRUST_OK_ANY_EKU)))
307 return X509_TRUST_REJECTED;
311 if (ax && ax->trust) {
312 for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
313 ASN1_OBJECT *obj = sk_ASN1_OBJECT_value(ax->trust, i);
314 int nid = OBJ_obj2nid(obj);
316 if (nid == id || (nid == NID_anyExtendedKeyUsage &&
317 (flags & X509_TRUST_OK_ANY_EKU)))
318 return X509_TRUST_TRUSTED;
321 * Reject when explicit trust EKU are set and none match.
323 * Returning untrusted is enough for for full chains that end in
324 * self-signed roots, because when explicit trust is specified it
325 * suppresses the default blanket trust of self-signed objects.
327 * But for partial chains, this is not enough, because absent a similar
328 * trust-self-signed policy, non matching EKUs are indistinguishable
329 * from lack of EKU constraints.
331 * Therefore, failure to match any trusted purpose must trigger an
334 return X509_TRUST_REJECTED;
337 if ((flags & X509_TRUST_DO_SS_COMPAT) == 0)
338 return X509_TRUST_UNTRUSTED;
341 * Not rejected, and there is no list of accepted uses, try compat.
343 return trust_compat(NULL, x, flags);