1 /* v3_lib.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 /* X509 v3 extension utilities */
60
61 #include <stdio.h>
62 #include "cryptlib.h"
63 #include <openssl/conf.h>
64 #include <openssl/x509v3.h>
65
66 #include "ext_dat.h"
67
68 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
69
70 static int ext_cmp(const X509V3_EXT_METHOD *const *a,
71 const X509V3_EXT_METHOD *const *b);
72 static void ext_list_free(X509V3_EXT_METHOD *ext);
73
X509V3_EXT_add(X509V3_EXT_METHOD * ext)74 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
75 {
76 if (!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_cmp))) {
77 X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
78 return 0;
79 }
80 if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
81 X509V3err(X509V3_F_X509V3_EXT_ADD, ERR_R_MALLOC_FAILURE);
82 return 0;
83 }
84 return 1;
85 }
86
ext_cmp(const X509V3_EXT_METHOD * const * a,const X509V3_EXT_METHOD * const * b)87 static int ext_cmp(const X509V3_EXT_METHOD *const *a,
88 const X509V3_EXT_METHOD *const *b)
89 {
90 return ((*a)->ext_nid - (*b)->ext_nid);
91 }
92
X509V3_EXT_get_nid(int nid)93 X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
94 {
95 X509V3_EXT_METHOD tmp, *t = &tmp, **ret;
96 int idx;
97 if (nid < 0)
98 return NULL;
99 tmp.ext_nid = nid;
100 ret = (X509V3_EXT_METHOD **)OBJ_bsearch((char *)&t,
101 (char *)standard_exts,
102 STANDARD_EXTENSION_COUNT,
103 sizeof(X509V3_EXT_METHOD *),
104 (int (*)
105 (const void *,
106 const void *))ext_cmp);
107 if (ret)
108 return *ret;
109 if (!ext_list)
110 return NULL;
111 idx = sk_X509V3_EXT_METHOD_find(ext_list, &tmp);
112 if (idx == -1)
113 return NULL;
114 return sk_X509V3_EXT_METHOD_value(ext_list, idx);
115 }
116
X509V3_EXT_get(X509_EXTENSION * ext)117 X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
118 {
119 int nid;
120 if ((nid = OBJ_obj2nid(ext->object)) == NID_undef)
121 return NULL;
122 return X509V3_EXT_get_nid(nid);
123 }
124
X509V3_EXT_add_list(X509V3_EXT_METHOD * extlist)125 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
126 {
127 for (; extlist->ext_nid != -1; extlist++)
128 if (!X509V3_EXT_add(extlist))
129 return 0;
130 return 1;
131 }
132
X509V3_EXT_add_alias(int nid_to,int nid_from)133 int X509V3_EXT_add_alias(int nid_to, int nid_from)
134 {
135 X509V3_EXT_METHOD *ext, *tmpext;
136 if (!(ext = X509V3_EXT_get_nid(nid_from))) {
137 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,
138 X509V3_R_EXTENSION_NOT_FOUND);
139 return 0;
140 }
141 if (!
142 (tmpext =
143 (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
144 X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, ERR_R_MALLOC_FAILURE);
145 return 0;
146 }
147 *tmpext = *ext;
148 tmpext->ext_nid = nid_to;
149 tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
150 return X509V3_EXT_add(tmpext);
151 }
152
X509V3_EXT_cleanup(void)153 void X509V3_EXT_cleanup(void)
154 {
155 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
156 ext_list = NULL;
157 }
158
ext_list_free(X509V3_EXT_METHOD * ext)159 static void ext_list_free(X509V3_EXT_METHOD *ext)
160 {
161 if (ext->ext_flags & X509V3_EXT_DYNAMIC)
162 OPENSSL_free(ext);
163 }
164
165 /*
166 * Legacy function: we don't need to add standard extensions any more because
167 * they are now kept in ext_dat.h.
168 */
169
X509V3_add_standard_extensions(void)170 int X509V3_add_standard_extensions(void)
171 {
172 return 1;
173 }
174
175 /* Return an extension internal structure */
176
X509V3_EXT_d2i(X509_EXTENSION * ext)177 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
178 {
179 X509V3_EXT_METHOD *method;
180 const unsigned char *p;
181
182 if (!(method = X509V3_EXT_get(ext)))
183 return NULL;
184 p = ext->value->data;
185 if (method->it)
186 return ASN1_item_d2i(NULL, &p, ext->value->length,
187 ASN1_ITEM_ptr(method->it));
188 return method->d2i(NULL, &p, ext->value->length);
189 }
190
191 /*-
192 * Get critical flag and decoded version of extension from a NID.
193 * The "idx" variable returns the last found extension and can
194 * be used to retrieve multiple extensions of the same NID.
195 * However multiple extensions with the same NID is usually
196 * due to a badly encoded certificate so if idx is NULL we
197 * choke if multiple extensions exist.
198 * The "crit" variable is set to the critical value.
199 * The return value is the decoded extension or NULL on
200 * error. The actual error can have several different causes,
201 * the value of *crit reflects the cause:
202 * >= 0, extension found but not decoded (reflects critical value).
203 * -1 extension not found.
204 * -2 extension occurs more than once.
205 */
206
X509V3_get_d2i(STACK_OF (X509_EXTENSION)* x,int nid,int * crit,int * idx)207 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
208 int *idx)
209 {
210 int lastpos, i;
211 X509_EXTENSION *ex, *found_ex = NULL;
212 if (!x) {
213 if (idx)
214 *idx = -1;
215 if (crit)
216 *crit = -1;
217 return NULL;
218 }
219 if (idx)
220 lastpos = *idx + 1;
221 else
222 lastpos = 0;
223 if (lastpos < 0)
224 lastpos = 0;
225 for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
226 ex = sk_X509_EXTENSION_value(x, i);
227 if (OBJ_obj2nid(ex->object) == nid) {
228 if (idx) {
229 *idx = i;
230 found_ex = ex;
231 break;
232 } else if (found_ex) {
233 /* Found more than one */
234 if (crit)
235 *crit = -2;
236 return NULL;
237 }
238 found_ex = ex;
239 }
240 }
241 if (found_ex) {
242 /* Found it */
243 if (crit)
244 *crit = X509_EXTENSION_get_critical(found_ex);
245 return X509V3_EXT_d2i(found_ex);
246 }
247
248 /* Extension not found */
249 if (idx)
250 *idx = -1;
251 if (crit)
252 *crit = -1;
253 return NULL;
254 }
255
256 /*
257 * This function is a general extension append, replace and delete utility.
258 * The precise operation is governed by the 'flags' value. The 'crit' and
259 * 'value' arguments (if relevant) are the extensions internal structure.
260 */
261
X509V3_add1_i2d(STACK_OF (X509_EXTENSION)** x,int nid,void * value,int crit,unsigned long flags)262 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
263 int crit, unsigned long flags)
264 {
265 int extidx = -1;
266 int errcode;
267 X509_EXTENSION *ext, *extmp;
268 unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
269
270 /*
271 * If appending we don't care if it exists, otherwise look for existing
272 * extension.
273 */
274 if (ext_op != X509V3_ADD_APPEND)
275 extidx = X509v3_get_ext_by_NID(*x, nid, -1);
276
277 /* See if extension exists */
278 if (extidx >= 0) {
279 /* If keep existing, nothing to do */
280 if (ext_op == X509V3_ADD_KEEP_EXISTING)
281 return 1;
282 /* If default then its an error */
283 if (ext_op == X509V3_ADD_DEFAULT) {
284 errcode = X509V3_R_EXTENSION_EXISTS;
285 goto err;
286 }
287 /* If delete, just delete it */
288 if (ext_op == X509V3_ADD_DELETE) {
289 if (!sk_X509_EXTENSION_delete(*x, extidx))
290 return -1;
291 return 1;
292 }
293 } else {
294 /*
295 * If replace existing or delete, error since extension must exist
296 */
297 if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
298 (ext_op == X509V3_ADD_DELETE)) {
299 errcode = X509V3_R_EXTENSION_NOT_FOUND;
300 goto err;
301 }
302 }
303
304 /*
305 * If we get this far then we have to create an extension: could have
306 * some flags for alternative encoding schemes...
307 */
308
309 ext = X509V3_EXT_i2d(nid, crit, value);
310
311 if (!ext) {
312 X509V3err(X509V3_F_X509V3_ADD1_I2D,
313 X509V3_R_ERROR_CREATING_EXTENSION);
314 return 0;
315 }
316
317 /* If extension exists replace it.. */
318 if (extidx >= 0) {
319 extmp = sk_X509_EXTENSION_value(*x, extidx);
320 X509_EXTENSION_free(extmp);
321 if (!sk_X509_EXTENSION_set(*x, extidx, ext))
322 return -1;
323 return 1;
324 }
325
326 if (!*x && !(*x = sk_X509_EXTENSION_new_null()))
327 return -1;
328 if (!sk_X509_EXTENSION_push(*x, ext))
329 return -1;
330
331 return 1;
332
333 err:
334 if (!(flags & X509V3_ADD_SILENT))
335 X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
336 return 0;
337 }
338
339 IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)
340