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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 | ||
64 | static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b); | |
65 | static void trtable_free(X509_TRUST *p); | |
66 | ||
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); | |
70 | ||
71 | static int obj_trust(int id, X509 *x, int flags); | |
72 | static 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 | ||
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, | |
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 OSSL_NELEM(trstandard) | |
98 | ||
99 | static STACK_OF(X509_TRUST) *trtable = NULL; | |
100 | ||
101 | static int tr_cmp(const X509_TRUST *const *a, const X509_TRUST *const *b) | |
102 | { | |
103 | return (*a)->trust - (*b)->trust; | |
104 | } | |
105 | ||
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 | ||
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 | ||
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 | ||
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 | ||
151 | int X509_TRUST_get_by_id(int id) | |
152 | { | |
153 | X509_TRUST tmp; | |
154 | int idx; | |
155 | if ((id >= X509_TRUST_MIN) && (id <= X509_TRUST_MAX)) | |
156 | return id - X509_TRUST_MIN; | |
157 | tmp.trust = id; | |
158 | if (!trtable) | |
159 | return -1; | |
160 | idx = sk_X509_TRUST_find(trtable, &tmp); | |
161 | if (idx == -1) | |
162 | return -1; | |
163 | return idx + X509_TRUST_COUNT; | |
164 | } | |
165 | ||
166 | int X509_TRUST_set(int *t, int trust) | |
167 | { | |
168 | if (X509_TRUST_get_by_id(trust) == -1) { | |
169 | X509err(X509_F_X509_TRUST_SET, X509_R_INVALID_TRUST); | |
170 | return 0; | |
171 | } | |
172 | *t = trust; | |
173 | return 1; | |
174 | } | |
175 | ||
176 | int X509_TRUST_add(int id, int flags, int (*ck) (X509_TRUST *, X509 *, int), | |
177 | char *name, int arg1, void *arg2) | |
178 | { | |
179 | int idx; | |
180 | X509_TRUST *trtmp; | |
181 | /* | |
182 | * This is set according to what we change: application can't set it | |
183 | */ | |
184 | flags &= ~X509_TRUST_DYNAMIC; | |
185 | /* This will always be set for application modified trust entries */ | |
186 | flags |= X509_TRUST_DYNAMIC_NAME; | |
187 | /* Get existing entry if any */ | |
188 | idx = X509_TRUST_get_by_id(id); | |
189 | /* Need a new entry */ | |
190 | if (idx == -1) { | |
191 | if (!(trtmp = OPENSSL_malloc(sizeof(*trtmp)))) { | |
192 | X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); | |
193 | return 0; | |
194 | } | |
195 | trtmp->flags = X509_TRUST_DYNAMIC; | |
196 | } else | |
197 | trtmp = X509_TRUST_get0(idx); | |
198 | ||
199 | /* OPENSSL_free existing name if dynamic */ | |
200 | if (trtmp->flags & X509_TRUST_DYNAMIC_NAME) | |
201 | OPENSSL_free(trtmp->name); | |
202 | /* dup supplied name */ | |
203 | if (!(trtmp->name = BUF_strdup(name))) { | |
204 | X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); | |
205 | return 0; | |
206 | } | |
207 | /* Keep the dynamic flag of existing entry */ | |
208 | trtmp->flags &= X509_TRUST_DYNAMIC; | |
209 | /* Set all other flags */ | |
210 | trtmp->flags |= flags; | |
211 | ||
212 | trtmp->trust = id; | |
213 | trtmp->check_trust = ck; | |
214 | trtmp->arg1 = arg1; | |
215 | trtmp->arg2 = arg2; | |
216 | ||
217 | /* If its a new entry manage the dynamic table */ | |
218 | if (idx == -1) { | |
219 | if (!trtable && !(trtable = sk_X509_TRUST_new(tr_cmp))) { | |
220 | X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); | |
221 | return 0; | |
222 | } | |
223 | if (!sk_X509_TRUST_push(trtable, trtmp)) { | |
224 | X509err(X509_F_X509_TRUST_ADD, ERR_R_MALLOC_FAILURE); | |
225 | return 0; | |
226 | } | |
227 | } | |
228 | return 1; | |
229 | } | |
230 | ||
231 | static void trtable_free(X509_TRUST *p) | |
232 | { | |
233 | if (!p) | |
234 | return; | |
235 | if (p->flags & X509_TRUST_DYNAMIC) { | |
236 | if (p->flags & X509_TRUST_DYNAMIC_NAME) | |
237 | OPENSSL_free(p->name); | |
238 | OPENSSL_free(p); | |
239 | } | |
240 | } | |
241 | ||
242 | void X509_TRUST_cleanup(void) | |
243 | { | |
244 | unsigned int i; | |
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 | ||
251 | int X509_TRUST_get_flags(X509_TRUST *xp) | |
252 | { | |
253 | return xp->flags; | |
254 | } | |
255 | ||
256 | char *X509_TRUST_get0_name(X509_TRUST *xp) | |
257 | { | |
258 | return xp->name; | |
259 | } | |
260 | ||
261 | int X509_TRUST_get_trust(X509_TRUST *xp) | |
262 | { | |
263 | return xp->trust; | |
264 | } | |
265 | ||
266 | static int trust_1oidany(X509_TRUST *trust, X509 *x, int flags) | |
267 | { | |
268 | if (x->aux && (x->aux->trust || x->aux->reject)) | |
269 | return obj_trust(trust->arg1, x, flags); | |
270 | /* | |
271 | * we don't have any trust settings: for compatibility we return trusted | |
272 | * if it is self signed | |
273 | */ | |
274 | return trust_compat(trust, x, flags); | |
275 | } | |
276 | ||
277 | static int trust_1oid(X509_TRUST *trust, X509 *x, int flags) | |
278 | { | |
279 | if (x->aux) | |
280 | return obj_trust(trust->arg1, x, flags); | |
281 | return X509_TRUST_UNTRUSTED; | |
282 | } | |
283 | ||
284 | static int trust_compat(X509_TRUST *trust, X509 *x, int flags) | |
285 | { | |
286 | X509_check_purpose(x, -1, 0); | |
287 | if (x->ex_flags & EXFLAG_SS) | |
288 | return X509_TRUST_TRUSTED; | |
289 | else | |
290 | return X509_TRUST_UNTRUSTED; | |
291 | } | |
292 | ||
293 | static int obj_trust(int id, X509 *x, int flags) | |
294 | { | |
295 | ASN1_OBJECT *obj; | |
296 | int i; | |
297 | X509_CERT_AUX *ax; | |
298 | ax = x->aux; | |
299 | if (!ax) | |
300 | return X509_TRUST_UNTRUSTED; | |
301 | if (ax->reject) { | |
302 | for (i = 0; i < sk_ASN1_OBJECT_num(ax->reject); i++) { | |
303 | obj = sk_ASN1_OBJECT_value(ax->reject, i); | |
304 | if (OBJ_obj2nid(obj) == id) | |
305 | return X509_TRUST_REJECTED; | |
306 | } | |
307 | } | |
308 | if (ax->trust) { | |
309 | for (i = 0; i < sk_ASN1_OBJECT_num(ax->trust); i++) { | |
310 | obj = sk_ASN1_OBJECT_value(ax->trust, i); | |
311 | if (OBJ_obj2nid(obj) == id) | |
312 | return X509_TRUST_TRUSTED; | |
313 | } | |
314 | } | |
315 | return X509_TRUST_UNTRUSTED; | |
316 | } |