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/*
* Copyright 1999-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/conf.h>
#include <openssl/asn1.h>
#include <openssl/asn1t.h>
#include <openssl/x509v3.h>
#include "crypto/x509.h"
#include "ext_dat.h"
static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
AUTHORITY_KEYID *akeyid,
STACK_OF(CONF_VALUE)
*extlist);
static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
X509V3_CTX *ctx,
STACK_OF(CONF_VALUE) *values);
const X509V3_EXT_METHOD ossl_v3_akey_id = {
NID_authority_key_identifier,
X509V3_EXT_MULTILINE, ASN1_ITEM_ref(AUTHORITY_KEYID),
0, 0, 0, 0,
0, 0,
(X509V3_EXT_I2V) i2v_AUTHORITY_KEYID,
(X509V3_EXT_V2I)v2i_AUTHORITY_KEYID,
0, 0,
NULL
};
static STACK_OF(CONF_VALUE) *i2v_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
AUTHORITY_KEYID *akeyid,
STACK_OF(CONF_VALUE)
*extlist)
{
char *tmp = NULL;
STACK_OF(CONF_VALUE) *origextlist = extlist, *tmpextlist;
if (akeyid->keyid) {
tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->keyid);
if (tmp == NULL) {
ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
return NULL;
}
if (!X509V3_add_value((akeyid->issuer || akeyid->serial) ? "keyid" : NULL,
tmp, &extlist)) {
OPENSSL_free(tmp);
ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
goto err;
}
OPENSSL_free(tmp);
}
if (akeyid->issuer) {
tmpextlist = i2v_GENERAL_NAMES(NULL, akeyid->issuer, extlist);
if (tmpextlist == NULL) {
ERR_raise(ERR_LIB_X509V3, ERR_R_X509_LIB);
goto err;
}
extlist = tmpextlist;
}
if (akeyid->serial) {
tmp = i2s_ASN1_OCTET_STRING(NULL, akeyid->serial);
if (tmp == NULL) {
ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
goto err;
}
if (!X509V3_add_value("serial", tmp, &extlist)) {
OPENSSL_free(tmp);
goto err;
}
OPENSSL_free(tmp);
}
return extlist;
err:
if (origextlist == NULL)
sk_CONF_VALUE_pop_free(extlist, X509V3_conf_free);
return NULL;
}
/*-
* Three explicit tags may be given, where 'keyid' and 'issuer' may be combined:
* 'none': do not add any authority key identifier.
* 'keyid': use the issuer's subject keyid; the option 'always' means its is
* an error if the issuer certificate doesn't have a subject key id.
* 'issuer': use the issuer's cert issuer and serial number. The default is
* to only use this if 'keyid' is not present. With the option 'always'
* this is always included.
*/
static AUTHORITY_KEYID *v2i_AUTHORITY_KEYID(X509V3_EXT_METHOD *method,
X509V3_CTX *ctx,
STACK_OF(CONF_VALUE) *values)
{
char keyid = 0, issuer = 0;
int i, n = sk_CONF_VALUE_num(values);
CONF_VALUE *cnf;
ASN1_OCTET_STRING *ikeyid = NULL;
X509_NAME *isname = NULL;
GENERAL_NAMES *gens = NULL;
GENERAL_NAME *gen = NULL;
ASN1_INTEGER *serial = NULL;
X509_EXTENSION *ext;
X509 *issuer_cert;
int same_issuer, ss;
AUTHORITY_KEYID *akeyid = AUTHORITY_KEYID_new();
if (akeyid == NULL)
goto err;
if (n == 1 && strcmp(sk_CONF_VALUE_value(values, 0)->name, "none") == 0) {
return akeyid;
}
for (i = 0; i < n; i++) {
cnf = sk_CONF_VALUE_value(values, i);
if (cnf->value != NULL && strcmp(cnf->value, "always") != 0) {
ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_OPTION,
"name=%s option=%s", cnf->name, cnf->value);
goto err;
}
if (strcmp(cnf->name, "keyid") == 0 && keyid == 0) {
keyid = 1;
if (cnf->value != NULL)
keyid = 2;
} else if (strcmp(cnf->name, "issuer") == 0 && issuer == 0) {
issuer = 1;
if (cnf->value != NULL)
issuer = 2;
} else if (strcmp(cnf->name, "none") == 0
|| strcmp(cnf->name, "keyid") == 0
|| strcmp(cnf->name, "issuer") == 0) {
ERR_raise_data(ERR_LIB_X509V3, X509V3_R_BAD_VALUE,
"name=%s", cnf->name);
goto err;
} else {
ERR_raise_data(ERR_LIB_X509V3, X509V3_R_UNKNOWN_VALUE,
"name=%s", cnf->name);
goto err;
}
}
if (ctx != NULL && (ctx->flags & X509V3_CTX_TEST) != 0)
return akeyid;
if (ctx == NULL) {
ERR_raise(ERR_LIB_X509V3, ERR_R_PASSED_NULL_PARAMETER);
goto err;
}
if ((issuer_cert = ctx->issuer_cert) == NULL) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_NO_ISSUER_CERTIFICATE);
goto err;
}
same_issuer = ctx->subject_cert == ctx->issuer_cert;
ERR_set_mark();
if (ctx->issuer_pkey != NULL)
ss = X509_check_private_key(ctx->subject_cert, ctx->issuer_pkey);
else
ss = same_issuer;
ERR_pop_to_mark();
/* unless forced with "always", AKID is suppressed for self-signed certs */
if (keyid == 2 || (keyid == 1 && !ss)) {
/*
* prefer any pre-existing subject key identifier of the issuer cert
* except issuer cert is same as subject cert and is not self-signed
*/
i = X509_get_ext_by_NID(issuer_cert, NID_subject_key_identifier, -1);
if (i >= 0 && (ext = X509_get_ext(issuer_cert, i)) != NULL
&& !(same_issuer && !ss)) {
ikeyid = X509V3_EXT_d2i(ext);
if (ASN1_STRING_length(ikeyid) == 0) /* indicating "none" */ {
ASN1_OCTET_STRING_free(ikeyid);
ikeyid = NULL;
}
}
if (ikeyid == NULL && same_issuer && ctx->issuer_pkey != NULL) {
/* generate fallback AKID, emulating s2i_skey_id(..., "hash") */
X509_PUBKEY *pubkey = NULL;
if (X509_PUBKEY_set(&pubkey, ctx->issuer_pkey))
ikeyid = ossl_x509_pubkey_hash(pubkey);
X509_PUBKEY_free(pubkey);
}
if (keyid == 2 && ikeyid == NULL) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_KEYID);
goto err;
}
}
if (issuer == 2 || (issuer == 1 && !ss && ikeyid == NULL)) {
isname = X509_NAME_dup(X509_get_issuer_name(issuer_cert));
serial = ASN1_INTEGER_dup(X509_get0_serialNumber(issuer_cert));
if (isname == NULL || serial == NULL) {
ERR_raise(ERR_LIB_X509V3, X509V3_R_UNABLE_TO_GET_ISSUER_DETAILS);
goto err;
}
}
if (isname != NULL) {
if ((gens = sk_GENERAL_NAME_new_null()) == NULL
|| (gen = GENERAL_NAME_new()) == NULL) {
ERR_raise(ERR_LIB_X509V3, ERR_R_ASN1_LIB);
goto err;
}
if (!sk_GENERAL_NAME_push(gens, gen)) {
ERR_raise(ERR_LIB_X509V3, ERR_R_CRYPTO_LIB);
goto err;
}
gen->type = GEN_DIRNAME;
gen->d.dirn = isname;
}
akeyid->issuer = gens;
gen = NULL;
gens = NULL;
akeyid->serial = serial;
akeyid->keyid = ikeyid;
return akeyid;
err:
sk_GENERAL_NAME_free(gens);
GENERAL_NAME_free(gen);
X509_NAME_free(isname);
ASN1_INTEGER_free(serial);
ASN1_OCTET_STRING_free(ikeyid);
AUTHORITY_KEYID_free(akeyid);
return NULL;
}
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