v3_lib.c revision 296341 
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
68static STACK_OF(X509V3_EXT_METHOD) *ext_list = NULL;
69
70static int ext_cmp(const X509V3_EXT_METHOD *const *a,
71                   const X509V3_EXT_METHOD *const *b);
72static void ext_list_free(X509V3_EXT_METHOD *ext);
73
74int 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
87static 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
93DECLARE_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
94                           const X509V3_EXT_METHOD *, ext);
95IMPLEMENT_OBJ_BSEARCH_CMP_FN(const X509V3_EXT_METHOD *,
96                             const X509V3_EXT_METHOD *, ext);
97
98const X509V3_EXT_METHOD *X509V3_EXT_get_nid(int nid)
99{
100    X509V3_EXT_METHOD tmp;
101    const X509V3_EXT_METHOD *t = &tmp, *const *ret;
102    int idx;
103    if (nid < 0)
104        return NULL;
105    tmp.ext_nid = nid;
106    ret = OBJ_bsearch_ext(&t, standard_exts, STANDARD_EXTENSION_COUNT);
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
117const 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
125int 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
133int X509V3_EXT_add_alias(int nid_to, int nid_from)
134{
135    const X509V3_EXT_METHOD *ext;
136    X509V3_EXT_METHOD *tmpext;
137
138    if (!(ext = X509V3_EXT_get_nid(nid_from))) {
139        X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS,
140                  X509V3_R_EXTENSION_NOT_FOUND);
141        return 0;
142    }
143    if (!
144        (tmpext =
145         (X509V3_EXT_METHOD *)OPENSSL_malloc(sizeof(X509V3_EXT_METHOD)))) {
146        X509V3err(X509V3_F_X509V3_EXT_ADD_ALIAS, ERR_R_MALLOC_FAILURE);
147        return 0;
148    }
149    *tmpext = *ext;
150    tmpext->ext_nid = nid_to;
151    tmpext->ext_flags |= X509V3_EXT_DYNAMIC;
152    return X509V3_EXT_add(tmpext);
153}
154
155void X509V3_EXT_cleanup(void)
156{
157    sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
158    ext_list = NULL;
159}
160
161static void ext_list_free(X509V3_EXT_METHOD *ext)
162{
163    if (ext->ext_flags & X509V3_EXT_DYNAMIC)
164        OPENSSL_free(ext);
165}
166
167/*
168 * Legacy function: we don't need to add standard extensions any more because
169 * they are now kept in ext_dat.h.
170 */
171
172int X509V3_add_standard_extensions(void)
173{
174    return 1;
175}
176
177/* Return an extension internal structure */
178
179void *X509V3_EXT_d2i(X509_EXTENSION *ext)
180{
181    const X509V3_EXT_METHOD *method;
182    const unsigned char *p;
183
184    if (!(method = X509V3_EXT_get(ext)))
185        return NULL;
186    p = ext->value->data;
187    if (method->it)
188        return ASN1_item_d2i(NULL, &p, ext->value->length,
189                             ASN1_ITEM_ptr(method->it));
190    return method->d2i(NULL, &p, ext->value->length);
191}
192
193/*-
194 * Get critical flag and decoded version of extension from a NID.
195 * The "idx" variable returns the last found extension and can
196 * be used to retrieve multiple extensions of the same NID.
197 * However multiple extensions with the same NID is usually
198 * due to a badly encoded certificate so if idx is NULL we
199 * choke if multiple extensions exist.
200 * The "crit" variable is set to the critical value.
201 * The return value is the decoded extension or NULL on
202 * error. The actual error can have several different causes,
203 * the value of *crit reflects the cause:
204 * >= 0, extension found but not decoded (reflects critical value).
205 * -1 extension not found.
206 * -2 extension occurs more than once.
207 */
208
209void *X509V3_get_d2i(STACK_OF(X509_EXTENSION) *x, int nid, int *crit,
210                     int *idx)
211{
212    int lastpos, i;
213    X509_EXTENSION *ex, *found_ex = NULL;
214    if (!x) {
215        if (idx)
216            *idx = -1;
217        if (crit)
218            *crit = -1;
219        return NULL;
220    }
221    if (idx)
222        lastpos = *idx + 1;
223    else
224        lastpos = 0;
225    if (lastpos < 0)
226        lastpos = 0;
227    for (i = lastpos; i < sk_X509_EXTENSION_num(x); i++) {
228        ex = sk_X509_EXTENSION_value(x, i);
229        if (OBJ_obj2nid(ex->object) == nid) {
230            if (idx) {
231                *idx = i;
232                found_ex = ex;
233                break;
234            } else if (found_ex) {
235                /* Found more than one */
236                if (crit)
237                    *crit = -2;
238                return NULL;
239            }
240            found_ex = ex;
241        }
242    }
243    if (found_ex) {
244        /* Found it */
245        if (crit)
246            *crit = X509_EXTENSION_get_critical(found_ex);
247        return X509V3_EXT_d2i(found_ex);
248    }
249
250    /* Extension not found */
251    if (idx)
252        *idx = -1;
253    if (crit)
254        *crit = -1;
255    return NULL;
256}
257
258/*
259 * This function is a general extension append, replace and delete utility.
260 * The precise operation is governed by the 'flags' value. The 'crit' and
261 * 'value' arguments (if relevant) are the extensions internal structure.
262 */
263
264int X509V3_add1_i2d(STACK_OF(X509_EXTENSION) **x, int nid, void *value,
265                    int crit, unsigned long flags)
266{
267    int extidx = -1;
268    int errcode;
269    X509_EXTENSION *ext, *extmp;
270    unsigned long ext_op = flags & X509V3_ADD_OP_MASK;
271
272    /*
273     * If appending we don't care if it exists, otherwise look for existing
274     * extension.
275     */
276    if (ext_op != X509V3_ADD_APPEND)
277        extidx = X509v3_get_ext_by_NID(*x, nid, -1);
278
279    /* See if extension exists */
280    if (extidx >= 0) {
281        /* If keep existing, nothing to do */
282        if (ext_op == X509V3_ADD_KEEP_EXISTING)
283            return 1;
284        /* If default then its an error */
285        if (ext_op == X509V3_ADD_DEFAULT) {
286            errcode = X509V3_R_EXTENSION_EXISTS;
287            goto err;
288        }
289        /* If delete, just delete it */
290        if (ext_op == X509V3_ADD_DELETE) {
291            if (!sk_X509_EXTENSION_delete(*x, extidx))
292                return -1;
293            return 1;
294        }
295    } else {
296        /*
297         * If replace existing or delete, error since extension must exist
298         */
299        if ((ext_op == X509V3_ADD_REPLACE_EXISTING) ||
300            (ext_op == X509V3_ADD_DELETE)) {
301            errcode = X509V3_R_EXTENSION_NOT_FOUND;
302            goto err;
303        }
304    }
305
306    /*
307     * If we get this far then we have to create an extension: could have
308     * some flags for alternative encoding schemes...
309     */
310
311    ext = X509V3_EXT_i2d(nid, crit, value);
312
313    if (!ext) {
314        X509V3err(X509V3_F_X509V3_ADD1_I2D,
315                  X509V3_R_ERROR_CREATING_EXTENSION);
316        return 0;
317    }
318
319    /* If extension exists replace it.. */
320    if (extidx >= 0) {
321        extmp = sk_X509_EXTENSION_value(*x, extidx);
322        X509_EXTENSION_free(extmp);
323        if (!sk_X509_EXTENSION_set(*x, extidx, ext))
324            return -1;
325        return 1;
326    }
327
328    if (!*x && !(*x = sk_X509_EXTENSION_new_null()))
329        return -1;
330    if (!sk_X509_EXTENSION_push(*x, ext))
331        return -1;
332
333    return 1;
334
335 err:
336    if (!(flags & X509V3_ADD_SILENT))
337        X509V3err(X509V3_F_X509V3_ADD1_I2D, errcode);
338    return 0;
339}
340
341IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)
342