1/* v3_akey.c */
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#include <stdio.h>
58#include <string.h>
59
60#include <openssl/asn1.h>
61#include <openssl/asn1t.h>
62#include <openssl/conf.h>
63#include <openssl/err.h>
64#include <openssl/mem.h>
65#include <openssl/obj.h>
66#include <openssl/x509v3.h>
67
68
69static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
70			AUTHORITY_KEYID *akeyid, STACK_OF(CONF_VALUE) *extlist);
71static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
72			X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values);
73
74const X509V3_EXT_METHOD v3_akey_id =
75	{
76	NID_authority_key_identifier,
77	X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
78	0,0,0,0,
79	0,0,
80	(X509V3_EXT_I2V)i2v_AUTHORITY_KEYID,
81	(X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
82	0,0,
83	NULL
84	};
85
86static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
87	     AUTHORITY_KEYID *akeyid, STACK_OF(CONF_VALUE) *extlist)
88{
89	char *tmp;
90	if(akeyid->keyid) {
91		tmp = hex_to_string(akeyid->keyid->data, akeyid->keyid->length);
92		X509V3_add_value("keyid", tmp, &extlist);
93		OPENSSL_free(tmp);
94	}
95	if(akeyid->issuer)
96		extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
97	if(akeyid->serial) {
98		tmp = hex_to_string(akeyid->serial->data,
99						 akeyid->serial->length);
100		X509V3_add_value("serial", tmp, &extlist);
101		OPENSSL_free(tmp);
102	}
103	return extlist;
104}
105
106/* Currently two options:
107 * keyid: use the issuers subject keyid, the value 'always' means its is
108 * an error if the issuer certificate doesn't have a key id.
109 * issuer: use the issuers cert issuer and serial number. The default is
110 * to only use this if keyid is not present. With the option 'always'
111 * this is always included.
112 */
113
114static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
115	     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values)
116	{
117	char keyid=0, issuer=0;
118	size_t i;
119	int j;
120	CONF_VALUE *cnf;
121	ASN1_OCTET_STRING *ikeyid = NULL;
122	X509_NAME *isname = NULL;
123	GENERAL_NAMES * gens = NULL;
124	GENERAL_NAME *gen = NULL;
125	ASN1_INTEGER *serial = NULL;
126	X509_EXTENSION *ext;
127	X509 *cert;
128	AUTHORITY_KEYID *akeyid;
129
130	for(i = 0; i < sk_CONF_VALUE_num(values); i++)
131		{
132		cnf = sk_CONF_VALUE_value(values, i);
133		if(!strcmp(cnf->name, "keyid"))
134			{
135			keyid = 1;
136			if(cnf->value && !strcmp(cnf->value, "always"))
137				keyid = 2;
138			}
139		else if(!strcmp(cnf->name, "issuer"))
140			{
141			issuer = 1;
142			if(cnf->value && !strcmp(cnf->value, "always"))
143				issuer = 2;
144			}
145		else
146			{
147			OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_OPTION);
148			ERR_add_error_data(2, "name=", cnf->name);
149			return NULL;
150			}
151		}
152
153	if(!ctx || !ctx->issuer_cert)
154		{
155		if(ctx && (ctx->flags==CTX_TEST))
156			return AUTHORITY_KEYID_new();
157		OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_ISSUER_CERTIFICATE);
158		return NULL;
159		}
160
161	cert = ctx->issuer_cert;
162
163	if(keyid)
164		{
165		j = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);
166		if((j >= 0)  && (ext = X509_get_ext(cert, j)))
167			ikeyid = X509V3_EXT_d2i(ext);
168		if(keyid==2 && !ikeyid)
169			{
170			OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
171			return NULL;
172			}
173		}
174
175	if((issuer && !ikeyid) || (issuer == 2))
176		{
177		isname = X509_NAME_dup(X509_get_issuer_name(cert));
178		serial = M_ASN1_INTEGER_dup(X509_get_serialNumber(cert));
179		if(!isname || !serial)
180			{
181			OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
182			goto err;
183			}
184		}
185
186	if(!(akeyid = AUTHORITY_KEYID_new())) goto err;
187
188	if(isname)
189		{
190		if(!(gens = sk_GENERAL_NAME_new_null())
191			|| !(gen = GENERAL_NAME_new())
192			|| !sk_GENERAL_NAME_push(gens, gen))
193			{
194			OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
195			goto err;
196			}
197		gen->type = GEN_DIRNAME;
198		gen->d.dirn = isname;
199		}
200
201	akeyid->issuer = gens;
202	akeyid->serial = serial;
203	akeyid->keyid = ikeyid;
204
205	return akeyid;
206
207 err:
208	X509_NAME_free(isname);
209	M_ASN1_INTEGER_free(serial);
210	M_ASN1_OCTET_STRING_free(ikeyid);
211	return NULL;
212	}
213