1 /* v3_lib.c */
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 /* X509 v3 extension utilities */
59
60 #include <stdio.h>
61 #include "cryptlib.h"
62 #include <openssl/conf.h>
63 #include <openssl/x509v3.h>
64
65 #include "ext_dat.h"
66
67 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
68
69 static int ext_cmp(const X509V3_EXT_METHOD * const *a,
70 const X509V3_EXT_METHOD * const *b);
71 static void ext_list_free(X509V3_EXT_METHOD *ext);
72
73 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
74 {
75 if(!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) {
76 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
77 return 0;
78 }
79 if(!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
80 X509V3err(X509V3_F_X509V3_EXT_ADD,ERR_R_MALLOC_FAILURE);
81 return 0;
82 }
83 return 1;
84 }
85
86 static int ext_cmp(const X509V3_EXT_METHOD * const *a,
87 const X509V3_EXT_METHOD * const *b)
88 {
89 return ((*a)->ext_nid - (*b)->ext_nid);
90 }
91
92 DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *, const X509V3_EXT_METHOD *,
93 ext);
94 IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
95 const X509V3_EXT_METHOD *, ext);
96
97 const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
98 {
99 X509V3_EXT_METHOD tmp;
100 const X509V3_EXT_METHOD *t = &tmp, * const *ret;
101 int idx;
102 if(nid < 0) return NULL;
103 tmp.ext_nid = nid;
104 ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT);
105 if(ret) return *ret;
106 if(!ext_list) return NULL;
107 idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
108 if(idx == -1) return NULL;
109 return sk_X509V3_EXT_METHOD_value(ext_list, idx);
110 }
111
112 const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
113 {
114 int nid;
115 if((nid = OBJ_obj2nid(ext->object)) == NID_undef) return NULL;
116 return X509V3_EXT_get_nid(nid);
117 }
118
119
120 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
121 {
122 for(;extlist->ext_nid!=-1;extlist++)
123 if(!X509V3_EXT_add(extlist)) return 0;
124 return 1;
125 }
126
127 int X509V3_EXT_add_alias(int nid_to, int nid_from)
128 {
129 const X509V3_EXT_METHOD *ext;
130 X509V3_EXT_METHOD *tmpext;
131
132 if(!(ext = X509V3_EXT_get_nid(nid_from))) {
133 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,X509V3_R_EXTENSION_NOT_FOUND);
134 return 0;
135 }
136 if(!(tmpext = (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
137 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,ERR_R_MALLOC_FAILURE);
138 return 0;
139 }
140 *tmpext = *ext;
141 tmpext->ext_nid = nid_to;
142 tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
143 return X509V3_EXT_add(tmpext);
144 }
145
146 void X509V3_EXT_cleanup(void)
147 {
148 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
149 ext_list = NULL;
150 }
151
152 static void ext_list_free(X509V3_EXT_METHOD *ext)
153 {
154 if(ext->ext_flags & X509V3_EXT_DYNAMIC) OPENSSL_free(ext);
155 }
156
157 /* Legacy function: we don't need to add standard extensions
158 * any more because they are now kept in ext_dat.h.
159 */
160
161 int X509V3_add_standard_extensions(void)
162 {
163 return 1;
164 }
165
166 /* Return an extension internal structure */
167
168 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
169 {
170 const X509V3_EXT_METHOD *method;
171 const unsigned char *p;
172
173 if(!(method = X509V3_EXT_get(ext))) return NULL;
174 p = ext->value->data;
175 if(method->it) return ASN1_item_d2i(NULL, &p, ext->value->length, ASN1_ITEM_ptr(method->it));
176 return method->d2i(NULL, &p, ext->value->length);
177 }
178
179 /* Get critical flag and decoded version of extension from a NID.
180 * The "idx" variable returns the last found extension and can
181 * be used to retrieve multiple extensions of the same NID.
182 * However multiple extensions with the same NID is usually
183 * due to a badly encoded certificate so if idx is NULL we
184 * choke if multiple extensions exist.
185 * The "crit" variable is set to the critical value.
186 * The return value is the decoded extension or NULL on
187 * error. The actual error can have several different causes,
188 * the value of *crit reflects the cause:
189 * >= 0, extension found but not decoded (reflects critical value).
190 * -1 extension not found.
191 * -2 extension occurs more than once.
192 */
193
194 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
195 {
196 int lastpos, i;
197 X509_EXTENSION *ex, *found_ex = NULL;
198 if(!x) {
199 if(idx) *idx = -1;
200 if(crit) *crit = -1;
201 return NULL;
202 }
203 if(idx) lastpos = *idx + 1;
204 else lastpos = 0;
205 if(lastpos < 0) lastpos = 0;
206 for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++)
207 {
208 ex = sk_X509_EXTENSION_value(x, i);
209 if(OBJ_obj2nid(ex->object) == nid) {
210 if(idx) {
211 *idx = i;
212 found_ex = ex;
213 break;
214 } else if(found_ex) {
215 /* Found more than one */
216 if(crit) *crit = -2;
217 return NULL;
218 }
219 found_ex = ex;
220 }
221 }
222 if(found_ex) {
223 /* Found it */
224 if(crit) *crit = X509_EXTENSION_get_critical(found_ex);
225 return X509V3_EXT_d2i(found_ex);
226 }
227
228 /* Extension not found */
229 if(idx) *idx = -1;
230 if(crit) *crit = -1;
231 return NULL;
232 }
233
234 /* This function is a general extension append, replace and delete utility.
235 * The precise operation is governed by the 'flags' value. The 'crit' and
236 * 'value' arguments (if relevant) are the extensions internal structure.
237 */
238
239 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
240 int crit, unsigned long flags)
241 {
242 int extidx = -1;
243 int errcode;
244 X509_EXTENSION *ext, *extmp;
245 unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
246
247 /* If appending we don't care if it exists, otherwise
248 * look for existing extension.
249 */
250 if(ext_op != X509V3_ADD_APPEND)
251 extidx = X509v3_get_ext_by_NID(*x, nid, -1);
252
253 /* See if extension exists */
254 if(extidx >= 0) {
255 /* If keep existing, nothing to do */
256 if(ext_op == X509V3_ADD_KEEP_EXISTING)
257 return 1;
258 /* If default then its an error */
259 if(ext_op == X509V3_ADD_DEFAULT) {
260 errcode = X509V3_R_EXTENSION_EXISTS;
261 goto err;
262 }
263 /* If delete, just delete it */
264 if(ext_op == X509V3_ADD_DELETE) {
265 if(!sk_X509_EXTENSION_delete(*x, extidx)) return -1;
266 return 1;
267 }
268 } else {
269 /* If replace existing or delete, error since
270 * extension must exist
271 */
272 if((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
273 (ext_op == X509V3_ADD_DELETE)) {
274 errcode = X509V3_R_EXTENSION_NOT_FOUND;
275 goto err;
276 }
277 }
278
279 /* If we get this far then we have to create an extension:
280 * could have some flags for alternative encoding schemes...
281 */
282
283 ext = X509V3_EXT_i2d(nid, crit, value);
284
285 if(!ext) {
286 X509V3err(X509V3_F_X509V3_ADD1_I2D, X509V3_R_ERROR_CREATING_EXTENSION);
287 return 0;
288 }
289
290 /* If extension exists replace it.. */
291 if(extidx >= 0) {
292 extmp = sk_X509_EXTENSION_value(*x, extidx);
293 X509_EXTENSION_free(extmp);
294 if(!sk_X509_EXTENSION_set(*x, extidx, ext)) return -1;
295 return 1;
296 }
297
298 if(!*x && !(*x = sk_X509_EXTENSION_new_null())) return -1;
299 if(!sk_X509_EXTENSION_push(*x, ext)) return -1;
300
301 return 1;
302
303 err:
304 if(!(flags & X509V3_ADD_SILENT))
305 X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
306 return 0;
307 }
308
309 IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)