1 /*
2 * Copyright 1999-2022 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 "crypto/x509.h"
17 #include "ext_dat.h"
18
19 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
20 AUTHORITY_KEYID *akeyid,
21 STACK_OF(CONF_VALUE)
22 *extlist);
23 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
24 X509V3_CTX *ctx,
25 STACK_OF(CONF_VALUE) *values);
26
27 const X509V3_EXT_METHOD ossl_v3_akey_id = {
28 NID_authority_key_identifier,
29 X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
30 0, 0, 0, 0,
31 0, 0,
32 (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,
33 (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
34 0, 0,
35 NULL
36 };
37
STACK_OF(CONF_VALUE)38 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
39 AUTHORITY_KEYID *akeyid,
40 STACK_OF(CONF_VALUE)
41 *extlist)
42 {
43 char *tmp = NULL;
44 STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist;
45
46 if (akeyid->keyid) {
47 tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->keyid);
48 if (tmp == NULL) {
49 ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
50 return NULL;
51 }
52 if (!X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL,
53 tmp, &extlist)) {
54 OPENSSL_free(tmp);
55 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
56 goto err;
57 }
58 OPENSSL_free(tmp);
59 }
60 if (akeyid->issuer) {
61 tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
62 if (tmpextlist == NULL) {
63 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
64 goto err;
65 }
66 extlist = tmpextlist;
67 }
68 if (akeyid->serial) {
69 tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->serial);
70 if (tmp == NULL) {
71 ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
72 goto err;
73 }
74 if (!X509V3_add_value("serial", tmp, &extlist)) {
75 OPENSSL_free(tmp);
76 goto err;
77 }
78 OPENSSL_free(tmp);
79 }
80 return extlist;
81 err:
82 if (origextlist == NULL)
83 sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free);
84 return NULL;
85 }
86
87 /*-
88 * Three explicit tags may be given, where 'keyid' and 'issuer' may be combined:
89 * 'none': do not add any authority key identifier.
90 * 'keyid': use the issuer's subject keyid; the option 'always' means its is
91 * an error if the issuer certificate doesn't have a subject key id.
92 * 'issuer': use the issuer's cert issuer and serial number. The default is
93 * to only use this if 'keyid' is not present. With the option 'always'
94 * this is always included.
95 */
v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD * method,X509V3_CTX * ctx,STACK_OF (CONF_VALUE)* values)96 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
97 X509V3_CTX *ctx,
98 STACK_OF(CONF_VALUE) *values)
99 {
100 char keyid = 0, issuer = 0;
101 int i, n = sk_CONF_VALUE_num(values);
102 CONF_VALUE *cnf;
103 ASN1_OCTET_STRING *ikeyid = NULL;
104 X509_NAME *isname = NULL;
105 GENERAL_NAMES *gens = NULL;
106 GENERAL_NAME *gen = NULL;
107 ASN1_INTEGER *serial = NULL;
108 X509_EXTENSION *ext;
109 X509 *issuer_cert;
110 int same_issuer, ss;
111 AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new();
112
113 if (akeyid == NULL)
114 goto err;
115
116 if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) {
117 return akeyid;
118 }
119
120 for (i = 0; i < n; i++) {
121 cnf = sk_CONF_VALUE_value(values, i);
122 if (cnf->value != NULL && strcmp(cnf->value, "always") != 0) {
123 ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_OPTION,
124 "name=%s option=%s", cnf->name, cnf->value);
125 goto err;
126 }
127 if (strcmp(cnf->name, "keyid") == 0 && keyid == 0) {
128 keyid = 1;
129 if (cnf->value != NULL)
130 keyid = 2;
131 } else if (strcmp(cnf->name, "issuer") == 0 && issuer == 0) {
132 issuer = 1;
133 if (cnf->value != NULL)
134 issuer = 2;
135 } else if (strcmp(cnf->name, "none") == 0
136 || strcmp(cnf->name, "keyid") == 0
137 || strcmp(cnf->name, "issuer") == 0) {
138 ERR_raise_data(ERR_LIB_X509V3, X509V3_R_BAD_VALUE,
139 "name=%s", cnf->name);
140 goto err;
141 } else {
142 ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_VALUE,
143 "name=%s", cnf->name);
144 goto err;
145 }
146 }
147
148 if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)
149 return akeyid;
150
151 if (ctx == NULL) {
152 ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
153 goto err;
154 }
155 if ((issuer_cert = ctx->issuer_cert) == NULL) {
156 ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE);
157 goto err;
158 }
159 same_issuer = ctx->subject_cert == ctx->issuer_cert;
160 ERR_set_mark();
161 if (ctx->issuer_pkey != NULL)
162 ss = X509_check_private_key(ctx->subject_cert, ctx->issuer_pkey);
163 else
164 ss = same_issuer;
165 ERR_pop_to_mark();
166
167 /* unless forced with "always", AKID is suppressed for self-signed certs */
168 if (keyid == 2 || (keyid == 1 && !ss)) {
169 /*
170 * prefer any pre-existing subject key identifier of the issuer cert
171 * except issuer cert is same as subject cert and is not self-signed
172 */
173 i = X509_get_ext_by_NID(issuer_cert, NID_subject_key_identifier, -1);
174 if (i >= 0 && (ext = X509_get_ext(issuer_cert, i)) != NULL
175 && !(same_issuer && !ss)) {
176 ikeyid = X509V3_EXT_d2i(ext);
177 if (ASN1_STRING_length(ikeyid) == 0) /* indicating "none" */ {
178 ASN1_OCTET_STRING_free(ikeyid);
179 ikeyid = NULL;
180 }
181 }
182 if (ikeyid == NULL && same_issuer && ctx->issuer_pkey != NULL) {
183 /* generate fallback AKID, emulating s2i_skey_id(..., "hash") */
184 X509_PUBKEY *pubkey = NULL;
185
186 if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey))
187 ikeyid = ossl_x509_pubkey_hash(pubkey);
188 X509_PUBKEY_free(pubkey);
189 }
190 if (keyid == 2 && ikeyid == NULL) {
191 ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
192 goto err;
193 }
194 }
195
196 if (issuer == 2 || (issuer == 1 && !ss && ikeyid == NULL)) {
197 isname = X509_NAME_dup(X509_get_issuer_name(issuer_cert));
198 serial = ASN1_INTEGER_dup(X509_get0_serialNumber(issuer_cert));
199 if (isname == NULL || serial == NULL) {
200 ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
201 goto err;
202 }
203 }
204
205 if (isname != NULL) {
206 if ((gens = sk_GENERAL_NAME_new_null()) == NULL
207 || (gen = GENERAL_NAME_new()) == NULL) {
208 ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
209 goto err;
210 }
211 if (!sk_GENERAL_NAME_push(gens, gen)) {
212 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
213 goto err;
214 }
215 gen->type = GEN_DIRNAME;
216 gen->d.dirn = isname;
217 }
218
219 akeyid->issuer = gens;
220 gen = NULL;
221 gens = NULL;
222 akeyid->serial = serial;
223 akeyid->keyid = ikeyid;
224
225 return akeyid;
226
227 err:
228 sk_GENERAL_NAME_free(gens);
229 GENERAL_NAME_free(gen);
230 X509_NAME_free(isname);
231 ASN1_INTEGER_free(serial);
232 ASN1_OCTET_STRING_free(ikeyid);
233 AUTHORITY_KEYID_free(akeyid);
234 return NULL;
235 }
236
