1/* $OpenBSD: x509_v3.c,v 1.30 2024/05/23 02:00:38 tb Exp $ */
2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 * All rights reserved.
4 *
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
8 *
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to.  The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 *
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
22 *
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
25 * are met:
26 * 1. Redistributions of source code must retain the copyright
27 *    notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 *    notice, this list of conditions and the following disclaimer in the
30 *    documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 *    must display the following acknowledgement:
33 *    "This product includes cryptographic software written by
34 *     Eric Young (eay@cryptsoft.com)"
35 *    The word 'cryptographic' can be left out if the rouines from the library
36 *    being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 *    the apps directory (application code) you must include an acknowledgement:
39 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 *
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 * SUCH DAMAGE.
52 *
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed.  i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
57 */
58
59#include <stdio.h>
60
61#include <openssl/asn1.h>
62#include <openssl/err.h>
63#include <openssl/evp.h>
64#include <openssl/objects.h>
65#include <openssl/stack.h>
66#include <openssl/x509.h>
67#include <openssl/x509v3.h>
68
69#include "x509_local.h"
70
71int
72X509v3_get_ext_count(const STACK_OF(X509_EXTENSION) *sk)
73{
74	if (sk == NULL)
75		return 0;
76
77	return sk_X509_EXTENSION_num(sk);
78}
79LCRYPTO_ALIAS(X509v3_get_ext_count);
80
81int
82X509v3_get_ext_by_NID(const STACK_OF(X509_EXTENSION) *sk, int nid, int lastpos)
83{
84	const ASN1_OBJECT *obj;
85
86	if ((obj = OBJ_nid2obj(nid)) == NULL)
87		return -2;
88
89	return X509v3_get_ext_by_OBJ(sk, obj, lastpos);
90}
91LCRYPTO_ALIAS(X509v3_get_ext_by_NID);
92
93int
94X509v3_get_ext_by_OBJ(const STACK_OF(X509_EXTENSION) *sk,
95    const ASN1_OBJECT *obj, int lastpos)
96{
97	int n;
98	X509_EXTENSION *ext;
99
100	if (sk == NULL)
101		return -1;
102	lastpos++;
103	if (lastpos < 0)
104		lastpos = 0;
105	n = sk_X509_EXTENSION_num(sk);
106	for (; lastpos < n; lastpos++) {
107		ext = sk_X509_EXTENSION_value(sk, lastpos);
108		if (OBJ_cmp(ext->object, obj) == 0)
109			return lastpos;
110	}
111	return -1;
112}
113LCRYPTO_ALIAS(X509v3_get_ext_by_OBJ);
114
115int
116X509v3_get_ext_by_critical(const STACK_OF(X509_EXTENSION) *sk, int crit,
117    int lastpos)
118{
119	int n;
120	X509_EXTENSION *ext;
121
122	if (sk == NULL)
123		return -1;
124	lastpos++;
125	if (lastpos < 0)
126		lastpos = 0;
127	n = sk_X509_EXTENSION_num(sk);
128	for (; lastpos < n; lastpos++) {
129		ext = sk_X509_EXTENSION_value(sk, lastpos);
130		if ((ext->critical > 0 && crit) ||
131		    (ext->critical <= 0 && !crit))
132			return lastpos;
133	}
134	return -1;
135}
136LCRYPTO_ALIAS(X509v3_get_ext_by_critical);
137
138X509_EXTENSION *
139X509v3_get_ext(const STACK_OF(X509_EXTENSION) *sk, int loc)
140{
141	if (sk == NULL || sk_X509_EXTENSION_num(sk) <= loc || loc < 0)
142		return NULL;
143
144	return sk_X509_EXTENSION_value(sk, loc);
145}
146LCRYPTO_ALIAS(X509v3_get_ext);
147
148X509_EXTENSION *
149X509v3_delete_ext(STACK_OF(X509_EXTENSION) *sk, int loc)
150{
151	if (sk == NULL || sk_X509_EXTENSION_num(sk) <= loc || loc < 0)
152		return NULL;
153
154	return sk_X509_EXTENSION_delete(sk, loc);
155}
156LCRYPTO_ALIAS(X509v3_delete_ext);
157
158STACK_OF(X509_EXTENSION) *
159X509v3_add_ext(STACK_OF(X509_EXTENSION) **x, X509_EXTENSION *ext, int loc)
160{
161	X509_EXTENSION *new_ext = NULL;
162	int n;
163	STACK_OF(X509_EXTENSION) *sk = NULL;
164
165	if (x == NULL) {
166		X509error(ERR_R_PASSED_NULL_PARAMETER);
167		goto err2;
168	}
169
170	if (*x == NULL) {
171		if ((sk = sk_X509_EXTENSION_new_null()) == NULL)
172			goto err;
173	} else
174		sk= *x;
175
176	n = sk_X509_EXTENSION_num(sk);
177	if (loc > n)
178		loc = n;
179	else if (loc < 0)
180		loc = n;
181
182	if ((new_ext = X509_EXTENSION_dup(ext)) == NULL)
183		goto err2;
184	if (!sk_X509_EXTENSION_insert(sk, new_ext, loc))
185		goto err;
186	if (*x == NULL)
187		*x = sk;
188	return sk;
189
190 err:
191	X509error(ERR_R_MALLOC_FAILURE);
192 err2:
193	if (new_ext != NULL)
194		X509_EXTENSION_free(new_ext);
195	if (sk != NULL && x != NULL && sk != *x)
196		sk_X509_EXTENSION_free(sk);
197	return NULL;
198}
199LCRYPTO_ALIAS(X509v3_add_ext);
200
201X509_EXTENSION *
202X509_EXTENSION_create_by_NID(X509_EXTENSION **ext, int nid, int crit,
203    ASN1_OCTET_STRING *data)
204{
205	ASN1_OBJECT *obj;
206	X509_EXTENSION *ret;
207
208	obj = OBJ_nid2obj(nid);
209	if (obj == NULL) {
210		X509error(X509_R_UNKNOWN_NID);
211		return NULL;
212	}
213	ret = X509_EXTENSION_create_by_OBJ(ext, obj, crit, data);
214	if (ret == NULL)
215		ASN1_OBJECT_free(obj);
216	return ret;
217}
218LCRYPTO_ALIAS(X509_EXTENSION_create_by_NID);
219
220X509_EXTENSION *
221X509_EXTENSION_create_by_OBJ(X509_EXTENSION **ext, const ASN1_OBJECT *obj,
222    int crit, ASN1_OCTET_STRING *data)
223{
224	X509_EXTENSION *ret;
225
226	if (ext == NULL || *ext == NULL) {
227		if ((ret = X509_EXTENSION_new()) == NULL) {
228			X509error(ERR_R_MALLOC_FAILURE);
229			return NULL;
230		}
231	} else
232		ret= *ext;
233
234	if (!X509_EXTENSION_set_object(ret, obj))
235		goto err;
236	if (!X509_EXTENSION_set_critical(ret, crit))
237		goto err;
238	if (!X509_EXTENSION_set_data(ret, data))
239		goto err;
240
241	if (ext != NULL && *ext == NULL)
242		*ext = ret;
243	return ret;
244
245 err:
246	if (ext == NULL || ret != *ext)
247		X509_EXTENSION_free(ret);
248	return NULL;
249}
250LCRYPTO_ALIAS(X509_EXTENSION_create_by_OBJ);
251
252int
253X509_EXTENSION_set_object(X509_EXTENSION *ext, const ASN1_OBJECT *obj)
254{
255	if (ext == NULL || obj == NULL)
256		return 0;
257
258	ASN1_OBJECT_free(ext->object);
259	ext->object = OBJ_dup(obj);
260
261	return ext->object != NULL;
262}
263LCRYPTO_ALIAS(X509_EXTENSION_set_object);
264
265int
266X509_EXTENSION_set_critical(X509_EXTENSION *ext, int crit)
267{
268	if (ext == NULL)
269		return 0;
270
271	ext->critical = crit ? 0xFF : -1;
272
273	return 1;
274}
275LCRYPTO_ALIAS(X509_EXTENSION_set_critical);
276
277int
278X509_EXTENSION_set_data(X509_EXTENSION *ext, ASN1_OCTET_STRING *data)
279{
280	if (ext == NULL)
281		return 0;
282
283	return ASN1_STRING_set(ext->value, data->data, data->length);
284}
285LCRYPTO_ALIAS(X509_EXTENSION_set_data);
286
287ASN1_OBJECT *
288X509_EXTENSION_get_object(X509_EXTENSION *ext)
289{
290	if (ext == NULL)
291		return NULL;
292
293	return ext->object;
294}
295LCRYPTO_ALIAS(X509_EXTENSION_get_object);
296
297ASN1_OCTET_STRING *
298X509_EXTENSION_get_data(X509_EXTENSION *ext)
299{
300	if (ext == NULL)
301		return NULL;
302
303	return ext->value;
304}
305LCRYPTO_ALIAS(X509_EXTENSION_get_data);
306
307int
308X509_EXTENSION_get_critical(const X509_EXTENSION *ext)
309{
310	if (ext == NULL)
311		return 0;
312	if (ext->critical > 0)
313		return 1;
314	return 0;
315}
316LCRYPTO_ALIAS(X509_EXTENSION_get_critical);
317