1 /* $OpenBSD: x509_akey.c,v 1.1 2020/06/04 15:19:31 jsing 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 
68 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
69     AUTHORITY_KEYID *akeyid, STACK_OF(CONF_VALUE) *extlist);
70 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
71     X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *values);
72 
73 const X509V3_EXT_METHOD v3_akey_id = {
74 	.ext_nid = NID_authority_key_identifier,
75 	.ext_flags = X509V3_EXT_MULTILINE,
76 	.it = &AUTHORITY_KEYID_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_AUTHORITY_KEYID,
84 	.v2i = (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
85 	.i2r = NULL,
86 	.r2i = NULL,
87 	.usr_data = NULL,
88 };
89 
STACK_OF(CONF_VALUE)90 static STACK_OF(CONF_VALUE) *
91 i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, AUTHORITY_KEYID *akeyid,
92     STACK_OF(CONF_VALUE) *extlist)
93 {
94 	STACK_OF(CONF_VALUE) *free_extlist = NULL;
95 	char *tmpstr = NULL;
96 
97 	if (extlist == NULL) {
98 		if ((free_extlist = extlist = sk_CONF_VALUE_new_null()) == NULL)
99 			return NULL;
100 	}
101 
102 	if (akeyid->keyid != NULL) {
103 		if ((tmpstr = hex_to_string(akeyid->keyid->data,
104 		    akeyid->keyid->length)) == NULL)
105 			goto err;
106 		if (!X509V3_add_value("keyid", tmpstr, &extlist))
107 			goto err;
108 		free(tmpstr);
109 		tmpstr = NULL;
110 	}
111 
112 	if (akeyid->issuer != NULL) {
113 		if ((extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer,
114 		    extlist)) == NULL)
115 			goto err;
116 	}
117 
118 	if (akeyid->serial != NULL) {
119 		if ((tmpstr = hex_to_string(akeyid->serial->data,
120 		    akeyid->serial->length)) == NULL)
121 			goto err;
122 		if (!X509V3_add_value("serial", tmpstr, &extlist))
123 			goto err;
124 		free(tmpstr);
125 		tmpstr = NULL;
126 	}
127 
128 	if (sk_CONF_VALUE_num(extlist) <= 0)
129 		goto err;
130 
131 	return extlist;
132 
133  err:
134 	free(tmpstr);
135 	sk_CONF_VALUE_pop_free(free_extlist, X509V3_conf_free);
136 
137 	return NULL;
138 }
139 
140 /*
141  * Currently two options:
142  * keyid: use the issuers subject keyid, the value 'always' means its is
143  * an error if the issuer certificate doesn't have a key id.
144  * issuer: use the issuers cert issuer and serial number. The default is
145  * to only use this if keyid is not present. With the option 'always'
146  * this is always included.
147  */
148 static AUTHORITY_KEYID *
v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD * method,X509V3_CTX * ctx,STACK_OF (CONF_VALUE)* values)149 v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
150     STACK_OF(CONF_VALUE) *values)
151 {
152 	char keyid = 0, issuer = 0;
153 	int i;
154 	CONF_VALUE *cnf;
155 	ASN1_OCTET_STRING *ikeyid = NULL;
156 	X509_NAME *isname = NULL;
157 	STACK_OF(GENERAL_NAME) *gens = NULL;
158 	GENERAL_NAME *gen = NULL;
159 	ASN1_INTEGER *serial = NULL;
160 	X509_EXTENSION *ext;
161 	X509 *cert;
162 	AUTHORITY_KEYID *akeyid = NULL;
163 
164 	for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
165 		cnf = sk_CONF_VALUE_value(values, i);
166 		if (!strcmp(cnf->name, "keyid")) {
167 			keyid = 1;
168 			if (cnf->value && !strcmp(cnf->value, "always"))
169 				keyid = 2;
170 		} else if (!strcmp(cnf->name, "issuer")) {
171 			issuer = 1;
172 			if (cnf->value && !strcmp(cnf->value, "always"))
173 				issuer = 2;
174 		} else {
175 			X509V3error(X509V3_R_UNKNOWN_OPTION);
176 			ERR_asprintf_error_data("name=%s", cnf->name);
177 			return NULL;
178 		}
179 	}
180 
181 	if (!ctx || !ctx->issuer_cert) {
182 		if (ctx && (ctx->flags == CTX_TEST))
183 			return AUTHORITY_KEYID_new();
184 		X509V3error(X509V3_R_NO_ISSUER_CERTIFICATE);
185 		return NULL;
186 	}
187 
188 	cert = ctx->issuer_cert;
189 
190 	if (keyid) {
191 		i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);
192 		if ((i >= 0)  && (ext = X509_get_ext(cert, i)))
193 			ikeyid = X509V3_EXT_d2i(ext);
194 		if (keyid == 2 && !ikeyid) {
195 			X509V3error(X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
196 			return NULL;
197 		}
198 	}
199 
200 	if ((issuer && !ikeyid) || (issuer == 2)) {
201 		isname = X509_NAME_dup(X509_get_issuer_name(cert));
202 		serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert));
203 		if (!isname || !serial) {
204 			X509V3error(X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
205 			goto err;
206 		}
207 	}
208 
209 	if (!(akeyid = AUTHORITY_KEYID_new()))
210 		goto err;
211 
212 	if (isname) {
213 		if (!(gens = sk_GENERAL_NAME_new_null()) ||
214 		    !(gen = GENERAL_NAME_new()) ||
215 		    !sk_GENERAL_NAME_push(gens, gen)) {
216 			X509V3error(ERR_R_MALLOC_FAILURE);
217 			goto err;
218 		}
219 		gen->type = GEN_DIRNAME;
220 		gen->d.dirn = isname;
221 	}
222 
223 	akeyid->issuer = gens;
224 	akeyid->serial = serial;
225 	akeyid->keyid = ikeyid;
226 
227 	return akeyid;
228 
229  err:
230 	AUTHORITY_KEYID_free(akeyid);
231 	GENERAL_NAME_free(gen);
232 	sk_GENERAL_NAME_free(gens);
233 	X509_NAME_free(isname);
234 	ASN1_INTEGER_free(serial);
235 	ASN1_OCTET_STRING_free(ikeyid);
236 	return NULL;
237 }
238