x509_trs.c revision 1.17 
1/* $OpenBSD: x509_trs.c,v 1.17 2014/10/16 03:19:02 beck 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 <string.h>
61
62#include <openssl/err.h>
63#include <openssl/x509v3.h>
64
65static int tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b);
66static void trtable_free(X509_TRUST *p);
67
68static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags);
69static int trust_1oid(X509_TRUST *trust, X509 *x, int flags);
70static int trust_compat(X509_TRUST *trust, X509 *x, int flags);
71
72static int obj_trust(int id, X509 *x, int flags);
73static 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
80static 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
93IMPLEMENT_STACK_OF(X509_TRUST)
94
95static STACK_OF(X509_TRUST) *trtable = NULL;
96
97static int
98tr_cmp(const X509_TRUST * const *a, const X509_TRUST * const *b)
99{
100	return (*a)->trust - (*b)->trust;
101}
102
103int
104(*X509_TRUST_set_default(int (*trust)(int , X509 *, int)))(int, X509 *, int)
105{
106	int (*oldtrust)(int , X509 *, int);
107
108	oldtrust = default_trust;
109	default_trust = trust;
110	return oldtrust;
111}
112
113int
114X509_check_trust(X509 *x, int id, int flags)
115{
116	X509_TRUST *pt;
117	int idx;
118
119	if (id == -1)
120		return 1;
121	idx = X509_TRUST_get_by_id(id);
122	if (idx == -1)
123		return default_trust(id, x, flags);
124	pt = X509_TRUST_get0(idx);
125	return pt->check_trust(pt, x, flags);
126}
127
128int
129X509_TRUST_get_count(void)
130{
131	if (!trtable)
132		return X509_TRUST_COUNT;
133	return sk_X509_TRUST_num(trtable) + X509_TRUST_COUNT;
134}
135
136X509_TRUST *
137X509_TRUST_get0(int idx)
138{
139	if (idx < 0)
140		return NULL;
141	if (idx < (int)X509_TRUST_COUNT)
142		return trstandard + idx;
143	return sk_X509_TRUST_value(trtable, idx - X509_TRUST_COUNT);
144}
145
146int
147X509_TRUST_get_by_id(int id)
148{
149	X509_TRUST tmp;
150	int idx;
151
152	if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
153		return id - X509_TRUST_MIN;
154	tmp.trust = id;
155	if (!trtable)
156		return -1;
157	idx = sk_X509_TRUST_find(trtable, &tmp);
158	if (idx == -1)
159		return -1;
160	return idx + X509_TRUST_COUNT;
161}
162
163int
164X509_TRUST_set(int *t, int trust)
165{
166	if (X509_TRUST_get_by_id(trust) == -1) {
167		X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
168		return 0;
169	}
170	*t = trust;
171	return 1;
172}
173
174int
175X509_TRUST_add(int id, int flags, int (*ck)(X509_TRUST *, X509 *, int),
176    char *name, int arg1, void *arg2)
177{
178	int idx;
179	X509_TRUST *trtmp;
180
181	/* This is set according to what we change: application can't set it */
182	flags &= ~X509_TRUST_DYNAMIC;
183	/* This will always be set for application modified trust entries */
184	flags |= X509_TRUST_DYNAMIC_NAME;
185	/* Get existing entry if any */
186	idx = X509_TRUST_get_by_id(id);
187	/* Need a new entry */
188	if (idx == -1) {
189		if (!(trtmp = malloc(sizeof(X509_TRUST)))) {
190			X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
191			return 0;
192		}
193		trtmp->flags = X509_TRUST_DYNAMIC;
194	} else {
195		trtmp = X509_TRUST_get0(idx);
196		if (trtmp == NULL) {
197			X509err(X509_F_X509_TRUST_ADD, X509_R_INVALID_TRUST);
198			return 0;
199		}
200	}
201
202	/* free existing name if dynamic */
203	if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
204		free(trtmp->name);
205	/* dup supplied name */
206	if (name == NULL || (trtmp->name = strdup(name)) == NULL)
207		goto err;
208	/* Keep the dynamic flag of existing entry */
209	trtmp->flags &= X509_TRUST_DYNAMIC;
210	/* Set all other flags */
211	trtmp->flags |= flags;
212
213	trtmp->trust = id;
214	trtmp->check_trust = ck;
215	trtmp->arg1 = arg1;
216	trtmp->arg2 = arg2;
217
218	/* If it's a new entry, manage the dynamic table */
219	if (idx == -1) {
220		if (trtable == NULL &&
221		    (trtable = sk_X509_TRUST_new(tr_cmp)) == NULL)
222			goto err;
223		if (sk_X509_TRUST_push(trtable, trtmp) == 0)
224			goto err;
225	}
226	return 1;
227
228err:
229	if (idx == -1) {
230		free(trtmp->name);
231		free(trtmp);
232	}
233	X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
234	return 0;
235}
236
237static void
238trtable_free(X509_TRUST *p)
239{
240	if (!p)
241		return;
242	if (p->flags & X509_TRUST_DYNAMIC) {
243		if (p->flags & X509_TRUST_DYNAMIC_NAME)
244			free(p->name);
245		free(p);
246	}
247}
248
249void
250X509_TRUST_cleanup(void)
251{
252	unsigned int i;
253
254	for (i = 0; i < X509_TRUST_COUNT; i++)
255		trtable_free(trstandard + i);
256	sk_X509_TRUST_pop_free(trtable, trtable_free);
257	trtable = NULL;
258}
259
260int
261X509_TRUST_get_flags(X509_TRUST *xp)
262{
263	return xp->flags;
264}
265
266char *
267X509_TRUST_get0_name(X509_TRUST *xp)
268{
269	return xp->name;
270}
271
272int
273X509_TRUST_get_trust(X509_TRUST *xp)
274{
275	return xp->trust;
276}
277
278static int
279trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
280{
281	if (x->aux && (x->aux->trust || x->aux->reject))
282		return obj_trust(trust->arg1, x, flags);
283	/* we don't have any trust settings: for compatibility
284	 * we return trusted if it is self signed
285	 */
286	return trust_compat(trust, x, flags);
287}
288
289static int
290trust_1oid(X509_TRUST *trust, X509 *x, int flags)
291{
292	if (x->aux)
293		return obj_trust(trust->arg1, x, flags);
294	return X509_TRUST_UNTRUSTED;
295}
296
297static int
298trust_compat(X509_TRUST *trust, X509 *x, int flags)
299{
300	X509_check_purpose(x, -1, 0);
301	if (x->ex_flags & EXFLAG_SS)
302		return X509_TRUST_TRUSTED;
303	else
304		return X509_TRUST_UNTRUSTED;
305}
306
307static int
308obj_trust(int id, X509 *x, int flags)
309{
310	ASN1_OBJECT *obj;
311	int i;
312	X509_CERT_AUX *ax;
313
314	ax = x->aux;
315	if (!ax)
316		return X509_TRUST_UNTRUSTED;
317	if (ax->reject) {
318		for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
319			obj = sk_ASN1_OBJECT_value(ax->reject, i);
320			if (OBJ_obj2nid(obj) == id)
321				return X509_TRUST_REJECTED;
322		}
323	}
324	if (ax->trust) {
325		for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
326			obj = sk_ASN1_OBJECT_value(ax->trust, i);
327			if (OBJ_obj2nid(obj) == id)
328				return X509_TRUST_TRUSTED;
329		}
330	}
331	return X509_TRUST_UNTRUSTED;
332}
333