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
62 #include <openssl/conf.h>
63 #include <openssl/err.h>
64 #include <openssl/mem.h>
65 #include <openssl/obj.h>
66 #include <openssl/x509v3.h>
67
68 #include "ext_dat.h"
69 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
70
71 static void ext_list_free(X509V3_EXT_METHOD *ext);
72
ext_stack_cmp(const X509V3_EXT_METHOD ** a,const X509V3_EXT_METHOD ** b)73 static int ext_stack_cmp(const X509V3_EXT_METHOD **a, const X509V3_EXT_METHOD **b)
74 {
75 return ((*a)->ext_nid - (*b)->ext_nid);
76 }
77
X509V3_EXT_add(X509V3_EXT_METHOD * ext)78 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
79 {
80 if(!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_stack_cmp))) {
81 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
82 ext_list_free(ext);
83 return 0;
84 }
85 if(!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
86 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
87 ext_list_free(ext);
88 return 0;
89 }
90 return 1;
91 }
92
ext_cmp(const void * void_a,const void * void_b)93 static int ext_cmp(const void *void_a,
94 const void *void_b)
95 {
96 const X509V3_EXT_METHOD **a = (const X509V3_EXT_METHOD**) void_a;
97 const X509V3_EXT_METHOD **b = (const X509V3_EXT_METHOD**) void_b;
98 return ext_stack_cmp(a, b);
99 }
100
X509V3_EXT_get_nid(int nid)101 const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
102 {
103 X509V3_EXT_METHOD tmp;
104 const X509V3_EXT_METHOD *t = &tmp, * const *ret;
105 size_t idx;
106
107 if(nid < 0) return NULL;
108 tmp.ext_nid = nid;
109 ret = bsearch(&t, standard_exts, STANDARD_EXTENSION_COUNT, sizeof(X509V3_EXT_METHOD*), ext_cmp);
110 if(ret) return *ret;
111 if(!ext_list) return NULL;
112
113 if (!sk_X509V3_EXT_METHOD_find(ext_list, &idx, &tmp))
114 return NULL;
115 return sk_X509V3_EXT_METHOD_value(ext_list, idx);
116 }
117
X509V3_EXT_get(X509_EXTENSION * ext)118 const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
119 {
120 int nid;
121 if((nid = OBJ_obj2nid(ext->object)) == NID_undef) return NULL;
122 return X509V3_EXT_get_nid(nid);
123 }
124
X509V3_EXT_free(int nid,void * ext_data)125 int X509V3_EXT_free(int nid, void *ext_data)
126 {
127 const X509V3_EXT_METHOD *ext_method = X509V3_EXT_get_nid(nid);
128 if (ext_method == NULL)
129 {
130 OPENSSL_PUT_ERROR(X509V3, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
131 return 0;
132 }
133
134 if (ext_method->it != NULL)
135 ASN1_item_free(ext_data, ASN1_ITEM_ptr(ext_method->it));
136 else if (ext_method->ext_free != NULL)
137 ext_method->ext_free(ext_data);
138 else
139 {
140 OPENSSL_PUT_ERROR(X509V3, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
141 return 0;
142 }
143
144 return 1;
145 }
146
X509V3_EXT_add_list(X509V3_EXT_METHOD * extlist)147 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
148 {
149 for(;extlist->ext_nid!=-1;extlist++)
150 if(!X509V3_EXT_add(extlist)) return 0;
151 return 1;
152 }
153
X509V3_EXT_add_alias(int nid_to,int nid_from)154 int X509V3_EXT_add_alias(int nid_to, int nid_from)
155 {
156 const X509V3_EXT_METHOD *ext;
157 X509V3_EXT_METHOD *tmpext;
158
159 if(!(ext = X509V3_EXT_get_nid(nid_from))) {
160 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NOT_FOUND);
161 return 0;
162 }
163 if(!(tmpext = (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
164 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
165 return 0;
166 }
167 *tmpext = *ext;
168 tmpext->ext_nid = nid_to;
169 tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
170 return X509V3_EXT_add(tmpext);
171 }
172
X509V3_EXT_cleanup(void)173 void X509V3_EXT_cleanup(void)
174 {
175 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
176 ext_list = NULL;
177 }
178
ext_list_free(X509V3_EXT_METHOD * ext)179 static void ext_list_free(X509V3_EXT_METHOD *ext)
180 {
181 if(ext->ext_flags & X509V3_EXT_DYNAMIC) OPENSSL_free(ext);
182 }
183
184 /* Legacy function: we don't need to add standard extensions
185 * any more because they are now kept in ext_dat.h.
186 */
187
X509V3_add_standard_extensions(void)188 int X509V3_add_standard_extensions(void)
189 {
190 return 1;
191 }
192
193 /* Return an extension internal structure */
194
X509V3_EXT_d2i(X509_EXTENSION * ext)195 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
196 {
197 const X509V3_EXT_METHOD *method;
198 const unsigned char *p;
199
200 if(!(method = X509V3_EXT_get(ext))) return NULL;
201 p = ext->value->data;
202 if(method->it) return ASN1_item_d2i(NULL, &p, ext->value->length, ASN1_ITEM_ptr(method->it));
203 return method->d2i(NULL, &p, ext->value->length);
204 }
205
206 /* Get critical flag and decoded version of extension from a NID.
207 * The "idx" variable returns the last found extension and can
208 * be used to retrieve multiple extensions of the same NID.
209 * However multiple extensions with the same NID is usually
210 * due to a badly encoded certificate so if idx is NULL we
211 * choke if multiple extensions exist.
212 * The "crit" variable is set to the critical value.
213 * The return value is the decoded extension or NULL on
214 * error. The actual error can have several different causes,
215 * the value of *crit reflects the cause:
216 * >= 0, extension found but not decoded (reflects critical value).
217 * -1 extension not found.
218 * -2 extension occurs more than once.
219 */
220
X509V3_get_d2i(STACK_OF (X509_EXTENSION)* x,int nid,int * crit,int * idx)221 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit, int *idx)
222 {
223 int lastpos;
224 size_t i;
225 X509_EXTENSION *ex, *found_ex = NULL;
226 if(!x) {
227 if(idx) *idx = -1;
228 if(crit) *crit = -1;
229 return NULL;
230 }
231 if(idx) lastpos = *idx + 1;
232 else lastpos = 0;
233 if(lastpos < 0) lastpos = 0;
234 for(i = lastpos; i < sk_X509_EXTENSION_num(x); i++)
235 {
236 ex = sk_X509_EXTENSION_value(x, i);
237 if(OBJ_obj2nid(ex->object) == nid) {
238 if(idx) {
239 *idx = i;
240 found_ex = ex;
241 break;
242 } else if(found_ex) {
243 /* Found more than one */
244 if(crit) *crit = -2;
245 return NULL;
246 }
247 found_ex = ex;
248 }
249 }
250 if(found_ex) {
251 /* Found it */
252 if(crit) *crit = X509_EXTENSION_get_critical(found_ex);
253 return X509V3_EXT_d2i(found_ex);
254 }
255
256 /* Extension not found */
257 if(idx) *idx = -1;
258 if(crit) *crit = -1;
259 return NULL;
260 }
261
262 /* This function is a general extension append, replace and delete utility.
263 * The precise operation is governed by the 'flags' value. The 'crit' and
264 * 'value' arguments (if relevant) are the extensions internal structure.
265 */
266
X509V3_add1_i2d(STACK_OF (X509_EXTENSION)** x,int nid,void * value,int crit,unsigned long flags)267 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
268 int crit, unsigned long flags)
269 {
270 int extidx = -1;
271 int errcode;
272 X509_EXTENSION *ext, *extmp;
273 unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
274
275 /* If appending we don't care if it exists, otherwise
276 * look for existing extension.
277 */
278 if(ext_op != X509V3_ADD_APPEND)
279 extidx = X509v3_get_ext_by_NID(*x, nid, -1);
280
281 /* See if extension exists */
282 if(extidx >= 0) {
283 /* If keep existing, nothing to do */
284 if(ext_op == X509V3_ADD_KEEP_EXISTING)
285 return 1;
286 /* If default then its an error */
287 if(ext_op == X509V3_ADD_DEFAULT) {
288 errcode = X509V3_R_EXTENSION_EXISTS;
289 goto err;
290 }
291 /* If delete, just delete it */
292 if(ext_op == X509V3_ADD_DELETE) {
293 if(!sk_X509_EXTENSION_delete(*x, extidx)) return -1;
294 return 1;
295 }
296 } else {
297 /* If replace existing or delete, error since
298 * extension must exist
299 */
300 if((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
301 (ext_op == X509V3_ADD_DELETE)) {
302 errcode = X509V3_R_EXTENSION_NOT_FOUND;
303 goto err;
304 }
305 }
306
307 /* If we get this far then we have to create an extension:
308 * could have some flags for alternative encoding schemes...
309 */
310
311 ext = X509V3_EXT_i2d(nid, crit, value);
312
313 if(!ext) {
314 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_CREATING_EXTENSION);
315 return 0;
316 }
317
318 /* If extension exists replace it.. */
319 if(extidx >= 0) {
320 extmp = sk_X509_EXTENSION_value(*x, extidx);
321 X509_EXTENSION_free(extmp);
322 if(!sk_X509_EXTENSION_set(*x, extidx, ext)) return -1;
323 return 1;
324 }
325
326 if(!*x && !(*x = sk_X509_EXTENSION_new_null())) return -1;
327 if(!sk_X509_EXTENSION_push(*x, ext)) return -1;
328
329 return 1;
330
331 err:
332 if(!(flags & X509V3_ADD_SILENT))
333 OPENSSL_PUT_ERROR(X509V3, errcode);
334 return 0;
335 }
336