1 /* $OpenBSD: x509_akey.c,v 1.2 2024/07/13 15:08:58 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
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 static const X509V3_EXT_METHOD x509v3_ext_authority_key_identifier = {
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
90 const X509V3_EXT_METHOD *
x509v3_ext_method_authority_key_identifier(void)91 x509v3_ext_method_authority_key_identifier(void)
92 {
93 return &x509v3_ext_authority_key_identifier;
94 }
95
STACK_OF(CONF_VALUE)96 static STACK_OF(CONF_VALUE) *
97 i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, AUTHORITY_KEYID *akeyid,
98 STACK_OF(CONF_VALUE) *extlist)
99 {
100 STACK_OF(CONF_VALUE) *free_extlist = NULL;
101 char *tmpstr = NULL;
102
103 if (extlist == NULL) {
104 if ((free_extlist = extlist = sk_CONF_VALUE_new_null()) == NULL)
105 return NULL;
106 }
107
108 if (akeyid->keyid != NULL) {
109 if ((tmpstr = hex_to_string(akeyid->keyid->data,
110 akeyid->keyid->length)) == NULL)
111 goto err;
112 if (!X509V3_add_value("keyid", tmpstr, &extlist))
113 goto err;
114 free(tmpstr);
115 tmpstr = NULL;
116 }
117
118 if (akeyid->issuer != NULL) {
119 if ((extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer,
120 extlist)) == NULL)
121 goto err;
122 }
123
124 if (akeyid->serial != NULL) {
125 if ((tmpstr = hex_to_string(akeyid->serial->data,
126 akeyid->serial->length)) == NULL)
127 goto err;
128 if (!X509V3_add_value("serial", tmpstr, &extlist))
129 goto err;
130 free(tmpstr);
131 tmpstr = NULL;
132 }
133
134 if (sk_CONF_VALUE_num(extlist) <= 0)
135 goto err;
136
137 return extlist;
138
139 err:
140 free(tmpstr);
141 sk_CONF_VALUE_pop_free(free_extlist, X509V3_conf_free);
142
143 return NULL;
144 }
145
146 /*
147 * Currently two options:
148 * keyid: use the issuers subject keyid, the value 'always' means its is
149 * an error if the issuer certificate doesn't have a key id.
150 * issuer: use the issuers cert issuer and serial number. The default is
151 * to only use this if keyid is not present. With the option 'always'
152 * this is always included.
153 */
154 static AUTHORITY_KEYID *
v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD * method,X509V3_CTX * ctx,STACK_OF (CONF_VALUE)* values)155 v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method, X509V3_CTX *ctx,
156 STACK_OF(CONF_VALUE) *values)
157 {
158 char keyid = 0, issuer = 0;
159 int i;
160 CONF_VALUE *cnf;
161 ASN1_OCTET_STRING *ikeyid = NULL;
162 X509_NAME *isname = NULL;
163 STACK_OF(GENERAL_NAME) *gens = NULL;
164 GENERAL_NAME *gen = NULL;
165 ASN1_INTEGER *serial = NULL;
166 X509_EXTENSION *ext;
167 X509 *cert;
168 AUTHORITY_KEYID *akeyid = NULL;
169
170 for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
171 cnf = sk_CONF_VALUE_value(values, i);
172 if (!strcmp(cnf->name, "keyid")) {
173 keyid = 1;
174 if (cnf->value && !strcmp(cnf->value, "always"))
175 keyid = 2;
176 } else if (!strcmp(cnf->name, "issuer")) {
177 issuer = 1;
178 if (cnf->value && !strcmp(cnf->value, "always"))
179 issuer = 2;
180 } else {
181 X509V3error(X509V3_R_UNKNOWN_OPTION);
182 ERR_asprintf_error_data("name=%s", cnf->name);
183 return NULL;
184 }
185 }
186
187 if (!ctx || !ctx->issuer_cert) {
188 if (ctx && (ctx->flags == CTX_TEST))
189 return AUTHORITY_KEYID_new();
190 X509V3error(X509V3_R_NO_ISSUER_CERTIFICATE);
191 return NULL;
192 }
193
194 cert = ctx->issuer_cert;
195
196 if (keyid) {
197 i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);
198 if ((i >= 0) && (ext = X509_get_ext(cert, i)))
199 ikeyid = X509V3_EXT_d2i(ext);
200 if (keyid == 2 && !ikeyid) {
201 X509V3error(X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
202 return NULL;
203 }
204 }
205
206 if ((issuer && !ikeyid) || (issuer == 2)) {
207 isname = X509_NAME_dup(X509_get_issuer_name(cert));
208 serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert));
209 if (!isname || !serial) {
210 X509V3error(X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
211 goto err;
212 }
213 }
214
215 if (!(akeyid = AUTHORITY_KEYID_new()))
216 goto err;
217
218 if (isname) {
219 if (!(gens = sk_GENERAL_NAME_new_null()) ||
220 !(gen = GENERAL_NAME_new()) ||
221 !sk_GENERAL_NAME_push(gens, gen)) {
222 X509V3error(ERR_R_MALLOC_FAILURE);
223 goto err;
224 }
225 gen->type = GEN_DIRNAME;
226 gen->d.dirn = isname;
227 }
228
229 akeyid->issuer = gens;
230 akeyid->serial = serial;
231 akeyid->keyid = ikeyid;
232
233 return akeyid;
234
235 err:
236 AUTHORITY_KEYID_free(akeyid);
237 GENERAL_NAME_free(gen);
238 sk_GENERAL_NAME_free(gens);
239 X509_NAME_free(isname);
240 ASN1_INTEGER_free(serial);
241 ASN1_OCTET_STRING_free(ikeyid);
242 return NULL;
243 }
244