2 * Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.
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
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"
19 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
20 AUTHORITY_KEYID *akeyid,
23 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
25 STACK_OF(CONF_VALUE) *values);
27 const X509V3_EXT_METHOD ossl_v3_akey_id = {
28 NID_authority_key_identifier,
29 X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
32 (X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,
33 (X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
38 static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
39 AUTHORITY_KEYID *akeyid,
44 STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist;
47 tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->keyid);
49 ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
52 if (!X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL,
55 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
61 tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
62 if (tmpextlist == NULL) {
63 ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
69 tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->serial);
71 ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
74 if (!X509V3_add_value("serial", tmp, &extlist)) {
82 if (origextlist == NULL)
83 sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free);
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.
96 static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
98 STACK_OF(CONF_VALUE) *values)
100 char keyid = 0, issuer = 0;
101 int i, n = sk_CONF_VALUE_num(values);
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;
111 AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new();
116 if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) {
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);
127 if (strcmp(cnf->name, "keyid") == 0 && keyid == 0) {
129 if (cnf->value != NULL)
131 } else if (strcmp(cnf->name, "issuer") == 0 && issuer == 0) {
133 if (cnf->value != NULL)
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);
142 ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_VALUE,
143 "name=%s", cnf->name);
148 if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)
152 ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
155 if ((issuer_cert = ctx->issuer_cert) == NULL) {
156 ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE);
159 same_issuer = ctx->subject_cert == ctx->issuer_cert;
161 if (ctx->issuer_pkey != NULL)
162 ss = X509_check_private_key(ctx->subject_cert, ctx->issuer_pkey);
167 /* unless forced with "always", AKID is suppressed for self-signed certs */
168 if (keyid == 2 || (keyid == 1 && !ss)) {
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
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);
182 if (ikeyid == NULL && same_issuer && ctx->issuer_pkey != NULL) {
183 /* generate fallback AKID, emulating s2i_skey_id(..., "hash") */
184 X509_PUBKEY *pubkey = NULL;
186 if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey))
187 ikeyid = ossl_x509_pubkey_hash(pubkey);
188 X509_PUBKEY_free(pubkey);
190 if (keyid == 2 && ikeyid == NULL) {
191 ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
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);
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);
211 if (!sk_GENERAL_NAME_push(gens, gen)) {
212 ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
215 gen->type = GEN_DIRNAME;
216 gen->d.dirn = isname;
219 akeyid->issuer = gens;
222 akeyid->serial = serial;
223 akeyid->keyid = ikeyid;
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);