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     if (!sk_X509_TRUST_find(trtable, &idx, &tmp)) {
162         return -1;
163     }
164     return idx + X509_TRUST_COUNT;
165 }
166 
X509_TRUST_set(int * t,int trust)167 int X509_TRUST_set(int *t, int trust)
168 {
169     if (X509_TRUST_get_by_id(trust) == -1) {
170         OPENSSL_PUT_ERROR(X509, X509_R_INVALID_TRUST);
171         return 0;
172     }
173     *t = trust;
174     return 1;
175 }
176 
X509_TRUST_add(int id,int flags,int (* ck)(X509_TRUST *,X509 *,int),char * name,int arg1,void * arg2)177 int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int),
178                    char *name, int arg1, void *arg2)
179 {
180     int idx;
181     X509_TRUST *trtmp;
182     char *name_dup;
183 
184     /*
185      * This is set according to what we change: application can't set it
186      */
187     flags &= ~X509_TRUST_DYNAMIC;
188     /* This will always be set for application modified trust entries */
189     flags |= X509_TRUST_DYNAMIC_NAME;
190     /* Get existing entry if any */
191     idx = X509_TRUST_get_by_id(id);
192     /* Need a new entry */
193     if (idx == -1) {
194         if (!(trtmp = OPENSSL_malloc(sizeof(X509_TRUST)))) {
195             OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
196             return 0;
197         }
198         trtmp->flags = X509_TRUST_DYNAMIC;
199     } else
200         trtmp = X509_TRUST_get0(idx);
201 
202     /* Duplicate the supplied name. */
203     name_dup = BUF_strdup(name);
204     if (name_dup == NULL) {
205         OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
206         if (idx == -1)
207             OPENSSL_free(trtmp);
208         return 0;
209     }
210 
211     /* OPENSSL_free existing name if dynamic */
212     if (trtmp->flags & X509_TRUST_DYNAMIC_NAME)
213         OPENSSL_free(trtmp->name);
214     trtmp->name = name_dup;
215     /* Keep the dynamic flag of existing entry */
216     trtmp->flags &= X509_TRUST_DYNAMIC;
217     /* Set all other flags */
218     trtmp->flags |= flags;
219 
220     trtmp->trust = id;
221     trtmp->check_trust = ck;
222     trtmp->arg1 = arg1;
223     trtmp->arg2 = arg2;
224 
225     /* If its a new entry manage the dynamic table */
226     if (idx == -1) {
227         if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) {
228             OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
229             trtable_free(trtmp);
230             return 0;
231         }
232         if (!sk_X509_TRUST_push(trtable, trtmp)) {
233             OPENSSL_PUT_ERROR(X509, ERR_R_MALLOC_FAILURE);
234             trtable_free(trtmp);
235             return 0;
236         }
237     }
238     return 1;
239 }
240 
trtable_free(X509_TRUST * p)241 static void trtable_free(X509_TRUST *p)
242 {
243     if (!p)
244         return;
245     if (p->flags & X509_TRUST_DYNAMIC) {
246         if (p->flags & X509_TRUST_DYNAMIC_NAME)
247             OPENSSL_free(p->name);
248         OPENSSL_free(p);
249     }
250 }
251 
X509_TRUST_cleanup(void)252 void X509_TRUST_cleanup(void)
253 {
254     unsigned int i;
255     for (i = 0; i < X509_TRUST_COUNT; i++)
256         trtable_free(trstandard + i);
257     sk_X509_TRUST_pop_free(trtable, trtable_free);
258     trtable = NULL;
259 }
260 
X509_TRUST_get_flags(X509_TRUST * xp)261 int X509_TRUST_get_flags(X509_TRUST *xp)
262 {
263     return xp->flags;
264 }
265 
X509_TRUST_get0_name(X509_TRUST * xp)266 char *X509_TRUST_get0_name(X509_TRUST *xp)
267 {
268     return xp->name;
269 }
270 
X509_TRUST_get_trust(X509_TRUST * xp)271 int X509_TRUST_get_trust(X509_TRUST *xp)
272 {
273     return xp->trust;
274 }
275 
trust_1oidany(X509_TRUST * trust,X509 * x,int flags)276 static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags)
277 {
278     if (x->aux && (x->aux->trust || x->aux->reject))
279         return obj_trust(trust->arg1, x, flags);
280     /*
281      * we don't have any trust settings: for compatibility we return trusted
282      * if it is self signed
283      */
284     return trust_compat(trust, x, flags);
285 }
286 
trust_1oid(X509_TRUST * trust,X509 * x,int flags)287 static int trust_1oid(X509_TRUST *trust, X509 *x, int flags)
288 {
289     if (x->aux)
290         return obj_trust(trust->arg1, x, flags);
291     return X509_TRUST_UNTRUSTED;
292 }
293 
trust_compat(X509_TRUST * trust,X509 * x,int flags)294 static int trust_compat(X509_TRUST *trust, X509 *x, int flags)
295 {
296     X509_check_purpose(x, -1, 0);
297     if (x->ex_flags & EXFLAG_SS)
298         return X509_TRUST_TRUSTED;
299     else
300         return X509_TRUST_UNTRUSTED;
301 }
302 
obj_trust(int id,X509 * x,int flags)303 static int obj_trust(int id, X509 *x, int flags)
304 {
305     ASN1_OBJECT *obj;
306     size_t i;
307     X509_CERT_AUX *ax;
308     ax = x->aux;
309     if (!ax)
310         return X509_TRUST_UNTRUSTED;
311     if (ax->reject) {
312         for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) {
313             obj = sk_ASN1_OBJECT_value(ax->reject, i);
314             if (OBJ_obj2nid(obj) == id)
315                 return X509_TRUST_REJECTED;
316         }
317     }
318     if (ax->trust) {
319         for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) {
320             obj = sk_ASN1_OBJECT_value(ax->trust, i);
321             if (OBJ_obj2nid(obj) == id)
322                 return X509_TRUST_TRUSTED;
323         }
324     }
325     return X509_TRUST_UNTRUSTED;
326 }
327