v3_lib.c revision 296465 
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
93X509V3_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
117X509V3_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    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
153void X509V3_EXT_cleanup(void)
154{
155    sk_X509V3_EXT_METHOD_pop_free(ext_list, ext_list_free);
156    ext_list = NULL;
157}
158
159static 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
170int X509V3_add_standard_extensions(void)
171{
172    return 1;
173}
174
175/* Return an extension internal structure */
176
177void *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
207void *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
262int 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
339IMPLEMENT_STACK_OF(X509V3_EXT_METHOD)
340