1/* $OpenBSD: x509_bcons.c,v 1.3 2023/02/16 08:38:17 tb Exp $ */
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
59#include <stdio.h>
60#include <string.h>
61
62#include <openssl/asn1.h>
63#include <openssl/asn1t.h>
64#include <openssl/conf.h>
65#include <openssl/err.h>
66#include <openssl/x509v3.h>
67
68static STACK_OF(CONF_VALUE) *i2v_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method,
69    BASIC_CONSTRAINTS *bcons, STACK_OF(CONF_VALUE) *extlist);
70static BASIC_CONSTRAINTS *v2i_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method,
71    X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values);
72
73const X509V3_EXT_METHOD v3_bcons = {
74	.ext_nid = NID_basic_constraints,
75	.ext_flags = 0,
76	.it = &BASIC_CONSTRAINTS_it,
77	.ext_new = NULL,
78	.ext_free = NULL,
79	.d2i = NULL,
80	.i2d = NULL,
81	.i2s = NULL,
82	.s2i = NULL,
83	.i2v = (X509V3_EXT_I2V)i2v_BASIC_CONSTRAINTS,
84	.v2i = (X509V3_EXT_V2I)v2i_BASIC_CONSTRAINTS,
85	.i2r = NULL,
86	.r2i = NULL,
87	.usr_data = NULL,
88};
89
90static const ASN1_TEMPLATE BASIC_CONSTRAINTS_seq_tt[] = {
91	{
92		.flags = ASN1_TFLG_OPTIONAL,
93		.tag = 0,
94		.offset = offsetof(BASIC_CONSTRAINTS, ca),
95		.field_name = "ca",
96		.item = &ASN1_FBOOLEAN_it,
97	},
98	{
99		.flags = ASN1_TFLG_OPTIONAL,
100		.tag = 0,
101		.offset = offsetof(BASIC_CONSTRAINTS, pathlen),
102		.field_name = "pathlen",
103		.item = &ASN1_INTEGER_it,
104	},
105};
106
107const ASN1_ITEM BASIC_CONSTRAINTS_it = {
108	.itype = ASN1_ITYPE_SEQUENCE,
109	.utype = V_ASN1_SEQUENCE,
110	.templates = BASIC_CONSTRAINTS_seq_tt,
111	.tcount = sizeof(BASIC_CONSTRAINTS_seq_tt) / sizeof(ASN1_TEMPLATE),
112	.funcs = NULL,
113	.size = sizeof(BASIC_CONSTRAINTS),
114	.sname = "BASIC_CONSTRAINTS",
115};
116
117
118BASIC_CONSTRAINTS *
119d2i_BASIC_CONSTRAINTS(BASIC_CONSTRAINTS **a, const unsigned char **in, long len)
120{
121	return (BASIC_CONSTRAINTS *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
122	    &BASIC_CONSTRAINTS_it);
123}
124LCRYPTO_ALIAS(d2i_BASIC_CONSTRAINTS);
125
126int
127i2d_BASIC_CONSTRAINTS(BASIC_CONSTRAINTS *a, unsigned char **out)
128{
129	return ASN1_item_i2d((ASN1_VALUE *)a, out, &BASIC_CONSTRAINTS_it);
130}
131LCRYPTO_ALIAS(i2d_BASIC_CONSTRAINTS);
132
133BASIC_CONSTRAINTS *
134BASIC_CONSTRAINTS_new(void)
135{
136	return (BASIC_CONSTRAINTS *)ASN1_item_new(&BASIC_CONSTRAINTS_it);
137}
138LCRYPTO_ALIAS(BASIC_CONSTRAINTS_new);
139
140void
141BASIC_CONSTRAINTS_free(BASIC_CONSTRAINTS *a)
142{
143	ASN1_item_free((ASN1_VALUE *)a, &BASIC_CONSTRAINTS_it);
144}
145LCRYPTO_ALIAS(BASIC_CONSTRAINTS_free);
146
147
148static STACK_OF(CONF_VALUE) *
149i2v_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method, BASIC_CONSTRAINTS *bcons,
150    STACK_OF(CONF_VALUE) *extlist)
151{
152	STACK_OF(CONF_VALUE) *free_extlist = NULL;
153
154	if (extlist == NULL) {
155		if ((free_extlist = extlist = sk_CONF_VALUE_new_null()) == NULL)
156			return NULL;
157	}
158
159	if (!X509V3_add_value_bool("CA", bcons->ca, &extlist))
160		goto err;
161	if (!X509V3_add_value_int("pathlen", bcons->pathlen, &extlist))
162		goto err;
163
164	return extlist;
165
166 err:
167	sk_CONF_VALUE_pop_free(free_extlist, X509V3_conf_free);
168
169	return NULL;
170}
171
172static BASIC_CONSTRAINTS *
173v2i_BASIC_CONSTRAINTS(X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
174    STACK_OF(CONF_VALUE) *values)
175{
176	BASIC_CONSTRAINTS *bcons = NULL;
177	CONF_VALUE *val;
178	int i;
179
180	if (!(bcons = BASIC_CONSTRAINTS_new())) {
181		X509V3error(ERR_R_MALLOC_FAILURE);
182		return NULL;
183	}
184	for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
185		val = sk_CONF_VALUE_value(values, i);
186		if (!strcmp(val->name, "CA")) {
187			if (!X509V3_get_value_bool(val, &bcons->ca))
188				goto err;
189		} else if (!strcmp(val->name, "pathlen")) {
190			if (!X509V3_get_value_int(val, &bcons->pathlen))
191				goto err;
192		} else {
193			X509V3error(X509V3_R_INVALID_NAME);
194			X509V3_conf_err(val);
195			goto err;
196		}
197	}
198	return bcons;
199
200err:
201	BASIC_CONSTRAINTS_free(bcons);
202	return NULL;
203}
204