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
63 #include <openssl/conf.h>
64 #include <openssl/err.h>
65 #include <openssl/mem.h>
66 #include <openssl/obj.h>
67 #include <openssl/x509v3.h>
68
69 #include "ext_dat.h"
70 static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
71
72 static void ext_list_free(X509V3_EXT_METHOD *ext);
73
ext_stack_cmp(const X509V3_EXT_METHOD ** a,const X509V3_EXT_METHOD ** b)74 static int ext_stack_cmp(const X509V3_EXT_METHOD **a,
75 const X509V3_EXT_METHOD **b)
76 {
77 return ((*a)->ext_nid - (*b)->ext_nid);
78 }
79
X509V3_EXT_add(X509V3_EXT_METHOD * ext)80 int X509V3_EXT_add(X509V3_EXT_METHOD *ext)
81 {
82 if (!ext_list && !(ext_list = sk_X509V3_EXT_METHOD_new(ext_stack_cmp))) {
83 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
84 ext_list_free(ext);
85 return 0;
86 }
87 if (!sk_X509V3_EXT_METHOD_push(ext_list, ext)) {
88 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
89 ext_list_free(ext);
90 return 0;
91 }
92 return 1;
93 }
94
ext_cmp(const void * void_a,const void * void_b)95 static int ext_cmp(const void *void_a, const void *void_b)
96 {
97 const X509V3_EXT_METHOD **a = (const X509V3_EXT_METHOD **)void_a;
98 const X509V3_EXT_METHOD **b = (const X509V3_EXT_METHOD **)void_b;
99 return ext_stack_cmp(a, b);
100 }
101
X509V3_EXT_get_nid(int nid)102 const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
103 {
104 X509V3_EXT_METHOD tmp;
105 const X509V3_EXT_METHOD *t = &tmp, *const *ret;
106 size_t idx;
107
108 if (nid < 0)
109 return NULL;
110 tmp.ext_nid = nid;
111 ret =
112 bsearch(&t, standard_exts, STANDARD_EXTENSION_COUNT,
113 sizeof(X509V3_EXT_METHOD *), ext_cmp);
114 if (ret)
115 return *ret;
116 if (!ext_list)
117 return NULL;
118
119 if (!sk_X509V3_EXT_METHOD_find(ext_list, &idx, &tmp))
120 return NULL;
121 return sk_X509V3_EXT_METHOD_value(ext_list, idx);
122 }
123
X509V3_EXT_get(X509_EXTENSION * ext)124 const X509V3_EXT_METHOD *X509V3_EXT_get(X509_EXTENSION *ext)
125 {
126 int nid;
127 if ((nid = OBJ_obj2nid(ext->object)) == NID_undef)
128 return NULL;
129 return X509V3_EXT_get_nid(nid);
130 }
131
X509V3_EXT_free(int nid,void * ext_data)132 int X509V3_EXT_free(int nid, void *ext_data)
133 {
134 const X509V3_EXT_METHOD *ext_method = X509V3_EXT_get_nid(nid);
135 if (ext_method == NULL) {
136 OPENSSL_PUT_ERROR(X509V3, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
137 return 0;
138 }
139
140 if (ext_method->it != NULL)
141 ASN1_item_free(ext_data, ASN1_ITEM_ptr(ext_method->it));
142 else if (ext_method->ext_free != NULL)
143 ext_method->ext_free(ext_data);
144 else {
145 OPENSSL_PUT_ERROR(X509V3, X509V3_R_CANNOT_FIND_FREE_FUNCTION);
146 return 0;
147 }
148
149 return 1;
150 }
151
X509V3_EXT_add_list(X509V3_EXT_METHOD * extlist)152 int X509V3_EXT_add_list(X509V3_EXT_METHOD *extlist)
153 {
154 for (; extlist->ext_nid != -1; extlist++)
155 if (!X509V3_EXT_add(extlist))
156 return 0;
157 return 1;
158 }
159
X509V3_EXT_add_alias(int nid_to,int nid_from)160 int X509V3_EXT_add_alias(int nid_to, int nid_from)
161 {
162 const X509V3_EXT_METHOD *ext;
163 X509V3_EXT_METHOD *tmpext;
164
165 if (!(ext = X509V3_EXT_get_nid(nid_from))) {
166 OPENSSL_PUT_ERROR(X509V3, X509V3_R_EXTENSION_NOT_FOUND);
167 return 0;
168 }
169 if (!
170 (tmpext =
171 (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
172 OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
173 return 0;
174 }
175 *tmpext = *ext;
176 tmpext->ext_nid = nid_to;
177 tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
178 return X509V3_EXT_add(tmpext);
179 }
180
X509V3_EXT_cleanup(void)181 void X509V3_EXT_cleanup(void)
182 {
183 sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
184 ext_list = NULL;
185 }
186
ext_list_free(X509V3_EXT_METHOD * ext)187 static void ext_list_free(X509V3_EXT_METHOD *ext)
188 {
189 if (ext->ext_flags & X509V3_EXT_DYNAMIC)
190 OPENSSL_free(ext);
191 }
192
193 /*
194 * Legacy function: we don't need to add standard extensions any more because
195 * they are now kept in ext_dat.h.
196 */
197
X509V3_add_standard_extensions(void)198 int X509V3_add_standard_extensions(void)
199 {
200 return 1;
201 }
202
203 /* Return an extension internal structure */
204
X509V3_EXT_d2i(X509_EXTENSION * ext)205 void *X509V3_EXT_d2i(X509_EXTENSION *ext)
206 {
207 const X509V3_EXT_METHOD *method;
208 const unsigned char *p;
209
210 if (!(method = X509V3_EXT_get(ext)))
211 return NULL;
212 p = ext->value->data;
213 if (method->it)
214 return ASN1_item_d2i(NULL, &p, ext->value->length,
215 ASN1_ITEM_ptr(method->it));
216 return method->d2i(NULL, &p, ext->value->length);
217 }
218
219 /*
220 * Get critical flag and decoded version of extension from a NID. The "idx"
221 * variable returns the last found extension and can be used to retrieve
222 * multiple extensions of the same NID. However multiple extensions with the
223 * same NID is usually due to a badly encoded certificate so if idx is NULL
224 * we choke if multiple extensions exist. The "crit" variable is set to the
225 * critical value. The return value is the decoded extension or NULL on
226 * error. The actual error can have several different causes, the value of
227 * *crit reflects the cause: >= 0, extension found but not decoded (reflects
228 * critical value). -1 extension not found. -2 extension occurs more than
229 * once.
230 */
231
X509V3_get_d2i(STACK_OF (X509_EXTENSION)* x,int nid,int * crit,int * idx)232 void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
233 int *idx)
234 {
235 int lastpos;
236 size_t i;
237 X509_EXTENSION *ex, *found_ex = NULL;
238 if (!x) {
239 if (idx)
240 *idx = -1;
241 if (crit)
242 *crit = -1;
243 return NULL;
244 }
245 if (idx)
246 lastpos = *idx + 1;
247 else
248 lastpos = 0;
249 if (lastpos < 0)
250 lastpos = 0;
251 for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
252 ex = sk_X509_EXTENSION_value(x, i);
253 if (OBJ_obj2nid(ex->object) == nid) {
254 if (idx) {
255 *idx = i;
256 found_ex = ex;
257 break;
258 } else if (found_ex) {
259 /* Found more than one */
260 if (crit)
261 *crit = -2;
262 return NULL;
263 }
264 found_ex = ex;
265 }
266 }
267 if (found_ex) {
268 /* Found it */
269 if (crit)
270 *crit = X509_EXTENSION_get_critical(found_ex);
271 return X509V3_EXT_d2i(found_ex);
272 }
273
274 /* Extension not found */
275 if (idx)
276 *idx = -1;
277 if (crit)
278 *crit = -1;
279 return NULL;
280 }
281
282 /*
283 * This function is a general extension append, replace and delete utility.
284 * The precise operation is governed by the 'flags' value. The 'crit' and
285 * 'value' arguments (if relevant) are the extensions internal structure.
286 */
287
X509V3_add1_i2d(STACK_OF (X509_EXTENSION)** x,int nid,void * value,int crit,unsigned long flags)288 int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
289 int crit, unsigned long flags)
290 {
291 int extidx = -1;
292 int errcode;
293 X509_EXTENSION *ext, *extmp;
294 unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
295
296 /*
297 * If appending we don't care if it exists, otherwise look for existing
298 * extension.
299 */
300 if (ext_op != X509V3_ADD_APPEND)
301 extidx = X509v3_get_ext_by_NID(*x, nid, -1);
302
303 /* See if extension exists */
304 if (extidx >= 0) {
305 /* If keep existing, nothing to do */
306 if (ext_op == X509V3_ADD_KEEP_EXISTING)
307 return 1;
308 /* If default then its an error */
309 if (ext_op == X509V3_ADD_DEFAULT) {
310 errcode = X509V3_R_EXTENSION_EXISTS;
311 goto err;
312 }
313 /* If delete, just delete it */
314 if (ext_op == X509V3_ADD_DELETE) {
315 if (!sk_X509_EXTENSION_delete(*x, extidx))
316 return -1;
317 return 1;
318 }
319 } else {
320 /*
321 * If replace existing or delete, error since extension must exist
322 */
323 if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
324 (ext_op == X509V3_ADD_DELETE)) {
325 errcode = X509V3_R_EXTENSION_NOT_FOUND;
326 goto err;
327 }
328 }
329
330 /*
331 * If we get this far then we have to create an extension: could have
332 * some flags for alternative encoding schemes...
333 */
334
335 ext = X509V3_EXT_i2d(nid, crit, value);
336
337 if (!ext) {
338 OPENSSL_PUT_ERROR(X509V3, X509V3_R_ERROR_CREATING_EXTENSION);
339 return 0;
340 }
341
342 /* If extension exists replace it.. */
343 if (extidx >= 0) {
344 extmp = sk_X509_EXTENSION_value(*x, extidx);
345 X509_EXTENSION_free(extmp);
346 if (!sk_X509_EXTENSION_set(*x, extidx, ext))
347 return -1;
348 return 1;
349 }
350
351 if (!*x && !(*x = sk_X509_EXTENSION_new_null()))
352 return -1;
353 if (!sk_X509_EXTENSION_push(*x, ext))
354 return -1;
355
356 return 1;
357
358 err:
359 if (!(flags & X509V3_ADD_SILENT))
360 OPENSSL_PUT_ERROR(X509V3, errcode);
361 return 0;
362 }
363