x509_trs.c revision 1.14 
1/* $OpenBSD: x509_trs.c,v 1.14 2014/06/12 15:49:31 deraadt Exp $ */
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
64static int tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b);
65static void trtable_free(X509_TRUST *p);
66
67static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
68static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
69static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
70
71static int obj_trust(int id, X509 *x, int flags);
72static int (*default_trust)(int id, X509 *x, int flags) = obj_trust;
73
74/* WARNING: the following table should be kept in order of trust
75 * and without any gaps so we can just subtract the minimum trust
76 * value to get an index into the table
77 */
78
79static X509_TRUST trstandard[] = {
80	{X509_TRUST_COMPAT, 0, trust_compat, "compatible", 0, NULL},
81	{X509_TRUST_SSL_CLIENT, 0, trust_1oidany, "SSL Client", NID_client_auth, NULL},
82	{X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth, NULL},
83	{X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect, NULL},
84	{X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign, NULL},
85	{X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign, NULL},
86	{X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP, NULL},
87	{X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
88};
89
90#define X509_TRUST_COUNT	(sizeof(trstandard)/sizeof(X509_TRUST))
91
92IMPLEMENT_STACK_OF(X509_TRUST)
93
94static STACK_OF(X509_TRUST) *trtable = NULL;
95
96static int
97tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b)
98{
99	return (*a)->trust - (*b)->trust;
100}
101
102int
103(*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
104{
105	int (*oldtrust)(int , X509 *, int);
106
107	oldtrust = default_trust;
108	default_trust = trust;
109	return oldtrust;
110}
111
112int
113X509_check_trust(X509 *x, int id, int flags)
114{
115	X509_TRUST *pt;
116	int idx;
117
118	if (id == -1)
119		return 1;
120	idx = X509_TRUST_get_by_id(id);
121	if (idx == -1)
122		return default_trust(id, x, flags);
123	pt = X509_TRUST_get0(idx);
124	return pt->check_trust(pt, x, flags);
125}
126
127int
128X509_TRUST_get_count(void)
129{
130	if (!trtable)
131		return X509_TRUST_COUNT;
132	return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
133}
134
135X509_TRUST *
136X509_TRUST_get0(int idx)
137{
138	if (idx < 0)
139		return NULL;
140	if (idx < (int)X509_TRUST_COUNT)
141		return trstandard + idx;
142	return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
143}
144
145int
146X509_TRUST_get_by_id(int id)
147{
148	X509_TRUST tmp;
149	int idx;
150
151	if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
152		return id - X509_TRUST_MIN;
153	tmp.trust = id;
154	if (!trtable)
155		return -1;
156	idx = sk_X509_TRUST_find(trtable, &tmp);
157	if (idx == -1)
158		return -1;
159	return idx + X509_TRUST_COUNT;
160}
161
162int
163X509_TRUST_set(int *t, int trust)
164{
165	if (X509_TRUST_get_by_id(trust) == -1) {
166		X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
167		return 0;
168	}
169	*t = trust;
170	return 1;
171}
172
173int
174X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
175    char *name, int arg1, void *arg2)
176{
177	int idx;
178	X509_TRUST *trtmp;
179
180	/* This is set according to what we change: application can't set it */
181	flags &= ~X509_TRUST_DYNAMIC;
182	/* This will always be set for application modified trust entries */
183	flags |= X509_TRUST_DYNAMIC_NAME;
184	/* Get existing entry if any */
185	idx = X509_TRUST_get_by_id(id);
186	/* Need a new entry */
187	if (idx == -1) {
188		if (!(trtmp = malloc(sizeof(X509_TRUST)))) {
189			X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
190			return 0;
191		}
192		trtmp->flags = X509_TRUST_DYNAMIC;
193	} else
194		trtmp = X509_TRUST_get0(idx);
195
196	/* free existing name if dynamic */
197	if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
198		free(trtmp->name);
199	/* dup supplied name */
200	if (!(trtmp->name = BUF_strdup(name))) {
201		X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
202		return 0;
203	}
204	/* Keep the dynamic flag of existing entry */
205	trtmp->flags &= X509_TRUST_DYNAMIC;
206	/* Set all other flags */
207	trtmp->flags |= flags;
208
209	trtmp->trust = id;
210	trtmp->check_trust = ck;
211	trtmp->arg1 = arg1;
212	trtmp->arg2 = arg2;
213
214	/* If its a new entry manage the dynamic table */
215	if (idx == -1) {
216		if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
217			X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
218			return 0;
219		}
220		if (!sk_X509_TRUST_push(trtable, trtmp)) {
221			X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
222			return 0;
223		}
224	}
225	return 1;
226}
227
228static void
229trtable_free(X509_TRUST *p)
230{
231	if (!p)
232		return;
233	if (p->flags & X509_TRUST_DYNAMIC) {
234		if (p->flags & X509_TRUST_DYNAMIC_NAME)
235			free(p->name);
236		free(p);
237	}
238}
239
240void
241X509_TRUST_cleanup(void)
242{
243	unsigned int i;
244
245	for (i = 0; i < X509_TRUST_COUNT; i++)
246		trtable_free(trstandard + i);
247	sk_X509_TRUST_pop_free(trtable, trtable_free);
248	trtable = NULL;
249}
250
251int
252X509_TRUST_get_flags(X509_TRUST *xp)
253{
254	return xp->flags;
255}
256
257char *
258X509_TRUST_get0_name(X509_TRUST *xp)
259{
260	return xp->name;
261}
262
263int
264X509_TRUST_get_trust(X509_TRUST *xp)
265{
266	return xp->trust;
267}
268
269static int
270trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
271{
272	if (x->aux && (x->aux->trust || x->aux->reject))
273		return obj_trust(trust->arg1, x, flags);
274	/* we don't have any trust settings: for compatibility
275	 * we return trusted if it is self signed
276	 */
277	return trust_compat(trust, x, flags);
278}
279
280static int
281trust_1oid(X509_TRUST *trust, X509 *x, int flags)
282{
283	if (x->aux)
284		return obj_trust(trust->arg1, x, flags);
285	return X509_TRUST_UNTRUSTED;
286}
287
288static int
289trust_compat(X509_TRUST *trust, X509 *x, int flags)
290{
291	X509_check_purpose(x, -1, 0);
292	if (x->ex_flags & EXFLAG_SS)
293		return X509_TRUST_TRUSTED;
294	else
295		return X509_TRUST_UNTRUSTED;
296}
297
298static int
299obj_trust(int id, X509 *x, int flags)
300{
301	ASN1_OBJECT *obj;
302	int i;
303	X509_CERT_AUX *ax;
304
305	ax = x->aux;
306	if (!ax)
307		return X509_TRUST_UNTRUSTED;
308	if (ax->reject) {
309		for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
310			obj = sk_ASN1_OBJECT_value(ax->reject, i);
311			if (OBJ_obj2nid(obj) == id)
312				return X509_TRUST_REJECTED;
313		}
314	}
315	if (ax->trust) {
316		for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
317			obj = sk_ASN1_OBJECT_value(ax->trust, i);
318			if (OBJ_obj2nid(obj) == id)
319				return X509_TRUST_TRUSTED;
320		}
321	}
322	return X509_TRUST_UNTRUSTED;
323}
324