1/*
2 * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include "internal/cryptlib.h"
12#include <openssl/conf.h>
13#include <openssl/asn1.h>
14#include <openssl/asn1t.h>
15#include <openssl/x509v3.h>
16#include "ext_dat.h"
17
18static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
19 AUTHORITY_KEYID *akeyid,
20 STACK_OF(CONF_VALUE)
21 *extlist);
22static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
23 X509V3_CTX *ctx,
24 STACK_OF(CONF_VALUE) *values);
25
26const X509V3_EXT_METHOD v3_akey_id = {
27 NID_authority_key_identifier,
28 X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
29 0, 0, 0, 0,
30 0, 0,
31 (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,
32 (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
33 0, 0,
34 NULL
35};
36
37static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
38 AUTHORITY_KEYID *akeyid,
39 STACK_OF(CONF_VALUE)
40 *extlist)
41{
42 char *tmp;
43 if (akeyid->keyid) {
44 tmp = OPENSSL_buf2hexstr(akeyid->keyid->data, akeyid->keyid->length);
45 if (tmp == NULL) {
46 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
47 return NULL;
48 }
49 X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL,
50 tmp, &extlist);
51 OPENSSL_free(tmp);
52 }
53 if (akeyid->issuer)
54 extlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
55 if (akeyid->serial) {
56 tmp = OPENSSL_buf2hexstr(akeyid->serial->data, akeyid->serial->length);
57 if (tmp == NULL) {
58 ERR_raise(ERR_LIB_X509V3, ERR_R_MALLOC_FAILURE);
59 return NULL;
60 }
61 X509V3_add_value("serial", tmp, &extlist);
62 OPENSSL_free(tmp);
63 }
64 return extlist;
65}
66
67/*-
68 * Currently two options:
69 * keyid: use the issuers subject keyid, the value 'always' means its is
70 * an error if the issuer certificate doesn't have a key id.
71 * issuer: use the issuers cert issuer and serial number. The default is
72 * to only use this if keyid is not present. With the option 'always'
73 * this is always included.
74 */
75
76static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
77 X509V3_CTX *ctx,
78 STACK_OF(CONF_VALUE) *values)
79{
80 char keyid = 0, issuer = 0;
81 int i;
82 CONF_VALUE *cnf;
83 ASN1_OCTET_STRING *ikeyid = NULL;
84 X509_NAME *isname = NULL;
85 GENERAL_NAMES *gens = NULL;
86 GENERAL_NAME *gen = NULL;
87 ASN1_INTEGER *serial = NULL;
88 X509_EXTENSION *ext;
89 X509 *cert;
90 AUTHORITY_KEYID *akeyid;
91
92 for (i = 0; i < sk_CONF_VALUE_num(values); i++) {
93 cnf = sk_CONF_VALUE_value(values, i);
94 if (strcmp(cnf->name, "keyid") == 0) {
95 keyid = 1;
96 if (cnf->value && strcmp(cnf->value, "always") == 0)
97 keyid = 2;
98 } else if (strcmp(cnf->name, "issuer") == 0) {
99 issuer = 1;
100 if (cnf->value && strcmp(cnf->value, "always") == 0)
101 issuer = 2;
102 } else {
103 X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, X509V3_R_UNKNOWN_OPTION);
104 ERR_add_error_data(2, "name=", cnf->name);
105 return NULL;
106 }
107 }
108
109 if (!ctx || !ctx->issuer_cert) {
110 if (ctx && (ctx->flags == CTX_TEST))
111 return AUTHORITY_KEYID_new();
112 X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,
113 X509V3_R_NO_ISSUER_CERTIFICATE);
114 return NULL;
115 }
116
117 cert = ctx->issuer_cert;
118
119 if (keyid) {
120 i = X509_get_ext_by_NID(cert, NID_subject_key_identifier, -1);
121 if ((i >= 0) && (ext = X509_get_ext(cert, i)))
122 ikeyid = X509V3_EXT_d2i(ext);
123 if (keyid == 2 && !ikeyid) {
124 X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,
125 X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
126 return NULL;
127 }
128 }
129
130 if ((issuer && !ikeyid) || (issuer == 2)) {
131 isname = X509_NAME_dup(X509_get_issuer_name(cert));
132 serial = ASN1_INTEGER_dup(X509_get_serialNumber(cert));
133 if (!isname || !serial) {
134 X509V3err(X509V3_F_V2I_AUTHORITY_KEYID,
135 X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
136 goto err;
137 }
138 }
139
140 if ((akeyid = AUTHORITY_KEYID_new()) == NULL)
141 goto err;
142
143 if (isname) {
144 if ((gens = sk_GENERAL_NAME_new_null()) == NULL
145 || (gen = GENERAL_NAME_new()) == NULL
146 || !sk_GENERAL_NAME_push(gens, gen)) {
147 X509V3err(X509V3_F_V2I_AUTHORITY_KEYID, ERR_R_MALLOC_FAILURE);
148 goto err;
149 }
150 gen->type = GEN_DIRNAME;
151 gen->d.dirn = isname;
152 }
153
154 akeyid->issuer = gens;
155 gen = NULL;
156 gens = NULL;
157 akeyid->serial = serial;
158 akeyid->keyid = ikeyid;
159
160 return akeyid;
161
162 err:
163 sk_GENERAL_NAME_free(gens);
164 GENERAL_NAME_free(gen);
165 X509_NAME_free(isname);
166 ASN1_INTEGER_free(serial);
167 ASN1_OCTET_STRING_free(ikeyid);
168 return NULL;
169}
170