1/* v3_akey.c */
2/*
3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 * 1999.
5 */
6/* ====================================================================
7 * Copyright (c) 1999 The OpenSSL Project.  All rights reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in
18 *    the documentation and/or other materials provided with the
19 *    distribution.
20 *
21 * 3. All advertising materials mentioning features or use of this
22 *    software must display the following acknowledgment:
23 *    "This product includes software developed by the OpenSSL Project
24 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
25 *
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 *    endorse or promote products derived from this software without
28 *    prior written permission. For written permission, please contact
29 *    licensing@OpenSSL.org.
30 *
31 * 5. Products derived from this software may not be called "OpenSSL"
32 *    nor may "OpenSSL" appear in their names without prior written
33 *    permission of the OpenSSL Project.
34 *
35 * 6. Redistributions of any form whatsoever must retain the following
36 *    acknowledgment:
37 *    "This product includes software developed by the OpenSSL Project
38 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
53 *
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com).  This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com). */
57
58#include <stdio.h>
59#include <string.h>
60
61#include <openssl/asn1.h>
62#include <openssl/asn1t.h>
63#include <openssl/conf.h>
64#include <openssl/err.h>
65#include <openssl/mem.h>
66#include <openssl/obj.h>
67#include <openssl/x509v3.h>
68
69static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
70                                                 AUTHORITY_KEYID *akeyid,
71                                                 STACK_OF(CONF_VALUE)
72                                                 *extlist);
73static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
74                                            X509V3_CTX *ctx,
75                                            STACK_OF(CONF_VALUE) *values);
76
77const X509V3_EXT_METHOD v3_akey_id = {
78    NID_authority_key_identifier,
79    X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
80    0, 0, 0, 0,
81    0, 0,
82    (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,
83    (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
84    0, 0,
85    NULL
86};
87
88static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
89                                                 AUTHORITY_KEYID *akeyid,
90                                                 STACK_OF(CONF_VALUE)
91                                                 *extlist)
92{
93    char *tmp;
94    if (akeyid->keyid) {
95        tmp = hex_to_string(akeyid->keyid->data, akeyid->keyid->length);
96        X509V3_add_value("keyid", tmp, &extlist);
97        OPENSSL_free(tmp);
98    }
99    if (akeyid->issuer)
100        extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
101    if (akeyid->serial) {
102        tmp = hex_to_string(akeyid->serial->data, akeyid->serial->length);
103        X509V3_add_value("serial", tmp, &extlist);
104        OPENSSL_free(tmp);
105    }
106    return extlist;
107}
108
109/*
110 * Currently two options: keyid: use the issuers subject keyid, the value
111 * 'always' means its is an error if the issuer certificate doesn't have a
112 * key id. issuer: use the issuers cert issuer and serial number. The default
113 * is to only use this if keyid is not present. With the option 'always' this
114 * is always included.
115 */
116
117static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
118                                            X509V3_CTX *ctx,
119                                            STACK_OF(CONF_VALUE) *values)
120{
121    char keyid = 0, issuer = 0;
122    size_t i;
123    int j;
124    CONF_VALUE *cnf;
125    ASN1_OCTET_STRING *ikeyid = NULL;
126    X509_NAME *isname = NULL;
127    GENERAL_NAMES *gens = NULL;
128    GENERAL_NAME *gen = NULL;
129    ASN1_INTEGER *serial = NULL;
130    X509_EXTENSION *ext;
131    X509 *cert;
132    AUTHORITY_KEYID *akeyid;
133
134    for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
135        cnf = sk_CONF_VALUE_value(values, i);
136        if (!strcmp(cnf->name, "keyid")) {
137            keyid = 1;
138            if (cnf->value && !strcmp(cnf->value, "always"))
139                keyid = 2;
140        } else if (!strcmp(cnf->name, "issuer")) {
141            issuer = 1;
142            if (cnf->value && !strcmp(cnf->value, "always"))
143                issuer = 2;
144        } else {
145            OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNKNOWN_OPTION);
146            ERR_add_error_data(2, "name=", cnf->name);
147            return NULL;
148        }
149    }
150
151    if (!ctx || !ctx->issuer_cert) {
152        if (ctx && (ctx->flags == CTX_TEST))
153            return AUTHORITY_KEYID_new();
154        OPENSSL_PUT_ERROR(X509V3, X509V3_R_NO_ISSUER_CERTIFICATE);
155        return NULL;
156    }
157
158    cert = ctx->issuer_cert;
159
160    if (keyid) {
161        j = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);
162        if ((j >= 0) && (ext = X509_get_ext(cert, j)))
163            ikeyid = X509V3_EXT_d2i(ext);
164        if (keyid == 2 && !ikeyid) {
165            OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
166            return NULL;
167        }
168    }
169
170    if ((issuer && !ikeyid) || (issuer == 2)) {
171        isname = X509_NAME_dup(X509_get_issuer_name(cert));
172        serial = M_ASN1_INTEGER_dup(X509_get_serialNumber(cert));
173        if (!isname || !serial) {
174            OPENSSL_PUT_ERROR(X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
175            goto err;
176        }
177    }
178
179    if (!(akeyid = AUTHORITY_KEYID_new()))
180        goto err;
181
182    if (isname) {
183        if (!(gens = sk_GENERAL_NAME_new_null())
184            || !(gen = GENERAL_NAME_new())
185            || !sk_GENERAL_NAME_push(gens, gen)) {
186            OPENSSL_PUT_ERROR(X509V3, ERR_R_MALLOC_FAILURE);
187            goto err;
188        }
189        gen->type = GEN_DIRNAME;
190        gen->d.dirn = isname;
191    }
192
193    akeyid->issuer = gens;
194    akeyid->serial = serial;
195    akeyid->keyid = ikeyid;
196
197    return akeyid;
198
199 err:
200    X509_NAME_free(isname);
201    M_ASN1_INTEGER_free(serial);
202    M_ASN1_OCTET_STRING_free(ikeyid);
203    return NULL;
204}
205