x509_trs.c revision 296341 
1/* x509_trs.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6/* ====================================================================
7 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
57 *
58 */
59
60#include <stdio.h>
61#include "cryptlib.h"
62#include <openssl/x509v3.h>
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/*
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
77 * 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,
83     NULL},
84    {X509_TRUST_SSL_SERVER, 0, trust_1oidany, "SSL Server", NID_server_auth,
85     NULL},
86    {X509_TRUST_EMAIL, 0, trust_1oidany, "S/MIME email", NID_email_protect,
87     NULL},
88    {X509_TRUST_OBJECT_SIGN, 0, trust_1oidany, "Object Signer", NID_code_sign,
89     NULL},
90    {X509_TRUST_OCSP_SIGN, 0, trust_1oid, "OCSP responder", NID_OCSP_sign,
91     NULL},
92    {X509_TRUST_OCSP_REQUEST, 0, trust_1oid, "OCSP request", NID_ad_OCSP,
93     NULL},
94    {X509_TRUST_TSA, 0, trust_1oidany, "TSA server", NID_time_stamp, NULL}
95};
96
97#define X509_TRUST_COUNT        (sizeof(trstandard)/sizeof(X509_TRUST))
98
99IMPLEMENT_STACK_OF(X509_TRUST)
100
101static STACK_OF(X509_TRUST) *trtable = NULL;
102
103static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b)
104{
105    return (*a)->trust - (*b)->trust;
106}
107
108int (*X509_TRUST_set_default(int (*trust) (int, X509 *, int))) (int, X509 *,
109                                                                int) {
110    int (*oldtrust) (int, X509 *, int);
111    oldtrust = default_trust;
112    default_trust = trust;
113    return oldtrust;
114}
115
116int X509_check_trust(X509 *x, int id, int flags)
117{
118    X509_TRUST *pt;
119    int idx;
120    if (id == -1)
121        return 1;
122    idx = X509_TRUST_get_by_id(id);
123    if (idx == -1)
124        return default_trust(id, x, flags);
125    pt = X509_TRUST_get0(idx);
126    return pt->check_trust(pt, x, flags);
127}
128
129int X509_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 *X509_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 X509_TRUST_get_by_id(int id)
146{
147    X509_TRUST tmp;
148    int idx;
149    if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX))
150        return id - X509_TRUST_MIN;
151    tmp.trust = id;
152    if (!trtable)
153        return -1;
154    idx = sk_X509_TRUST_find(trtable, &tmp);
155    if (idx == -1)
156        return -1;
157    return idx + X509_TRUST_COUNT;
158}
159
160int X509_TRUST_set(int *t, int trust)
161{
162    if (X509_TRUST_get_by_id(trust) == -1) {
163        X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST);
164        return 0;
165    }
166    *t = trust;
167    return 1;
168}
169
170int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
171                   char *name, int arg1, void *arg2)
172{
173    int idx;
174    X509_TRUST *trtmp;
175    /*
176     * This is set according to what we change: application can't set it
177     */
178    flags &= ~X509_TRUST_DYNAMIC;
179    /* This will always be set for application modified trust entries */
180    flags |= X509_TRUST_DYNAMIC_NAME;
181    /* Get existing entry if any */
182    idx = X509_TRUST_get_by_id(id);
183    /* Need a new entry */
184    if (idx == -1) {
185        if (!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
186            X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
187            return 0;
188        }
189        trtmp->flags = X509_TRUST_DYNAMIC;
190    } else
191        trtmp = X509_TRUST_get0(idx);
192
193    /* OPENSSL_free existing name if dynamic */
194    if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
195        OPENSSL_free(trtmp->name);
196    /* dup supplied name */
197    if (!(trtmp->name = BUF_strdup(name))) {
198        X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
199        return 0;
200    }
201    /* Keep the dynamic flag of existing entry */
202    trtmp->flags &= X509_TRUST_DYNAMIC;
203    /* Set all other flags */
204    trtmp->flags |= flags;
205
206    trtmp->trust = id;
207    trtmp->check_trust = ck;
208    trtmp->arg1 = arg1;
209    trtmp->arg2 = arg2;
210
211    /* If its a new entry manage the dynamic table */
212    if (idx == -1) {
213        if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
214            X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
215            return 0;
216        }
217        if (!sk_X509_TRUST_push(trtable, trtmp)) {
218            X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE);
219            return 0;
220        }
221    }
222    return 1;
223}
224
225static void trtable_free(X509_TRUST *p)
226{
227    if (!p)
228        return;
229    if (p->flags & X509_TRUST_DYNAMIC) {
230        if (p->flags & X509_TRUST_DYNAMIC_NAME)
231            OPENSSL_free(p->name);
232        OPENSSL_free(p);
233    }
234}
235
236void X509_TRUST_cleanup(void)
237{
238    unsigned int i;
239    for (i = 0; i < X509_TRUST_COUNT; i++)
240        trtable_free(trstandard + i);
241    sk_X509_TRUST_pop_free(trtable, trtable_free);
242    trtable = NULL;
243}
244
245int X509_TRUST_get_flags(X509_TRUST *xp)
246{
247    return xp->flags;
248}
249
250char *X509_TRUST_get0_name(X509_TRUST *xp)
251{
252    return xp->name;
253}
254
255int X509_TRUST_get_trust(X509_TRUST *xp)
256{
257    return xp->trust;
258}
259
260static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
261{
262    if (x->aux && (x->aux->trust || x->aux->reject))
263        return obj_trust(trust->arg1, x, flags);
264    /*
265     * we don't have any trust settings: for compatibility we return trusted
266     * if it is self signed
267     */
268    return trust_compat(trust, x, flags);
269}
270
271static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
272{
273    if (x->aux)
274        return obj_trust(trust->arg1, x, flags);
275    return X509_TRUST_UNTRUSTED;
276}
277
278static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
279{
280    X509_check_purpose(x, -1, 0);
281    if (x->ex_flags & EXFLAG_SS)
282        return X509_TRUST_TRUSTED;
283    else
284        return X509_TRUST_UNTRUSTED;
285}
286
287static int obj_trust(int id, X509 *x, int flags)
288{
289    ASN1_OBJECT *obj;
290    int i;
291    X509_CERT_AUX *ax;
292    ax = x->aux;
293    if (!ax)
294        return X509_TRUST_UNTRUSTED;
295    if (ax->reject) {
296        for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
297            obj = sk_ASN1_OBJECT_value(ax->reject, i);
298            if (OBJ_obj2nid(obj) == id)
299                return X509_TRUST_REJECTED;
300        }
301    }
302    if (ax->trust) {
303        for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
304            obj = sk_ASN1_OBJECT_value(ax->trust, i);
305            if (OBJ_obj2nid(obj) == id)
306                return X509_TRUST_TRUSTED;
307        }
308    }
309    return X509_TRUST_UNTRUSTED;
310}
311