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/* Copyright (C) 2018 CZ.NIC, z.s.p.o. <knot-dns@labs.nic.cz>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include <gnutls/abstract.h>
#include <gnutls/gnutls.h>
#include <gnutls/x509.h>
#include "libdnssec/binary.h"
#include "libdnssec/error.h"
#include "libdnssec/key.h"
#include "libdnssec/keyid.h"
#include "libdnssec/shared/keyid_gnutls.h"
#include "libdnssec/shared/pem.h"
#include "libdnssec/shared/shared.h"
/* -- internal API --------------------------------------------------------- */
/*!
* Create GnuTLS X.509 private key from unencrypted PEM data.
*/
int pem_x509(const dnssec_binary_t *pem, gnutls_x509_privkey_t *key)
{
assert(pem);
assert(key);
gnutls_datum_t data = binary_to_datum(pem);
gnutls_x509_privkey_t _key = NULL;
int r = gnutls_x509_privkey_init(&_key);
if (r != GNUTLS_E_SUCCESS) {
return DNSSEC_ENOMEM;
}
int format = GNUTLS_X509_FMT_PEM;
char *password = NULL;
int flags = GNUTLS_PKCS_PLAIN;
r = gnutls_x509_privkey_import_pkcs8(_key, &data, format, password, flags);
if (r != GNUTLS_E_SUCCESS) {
gnutls_x509_privkey_deinit(_key);
return DNSSEC_PKCS8_IMPORT_ERROR;
}
*key = _key;
return DNSSEC_EOK;
}
/*!
* Create GnuTLS private key from unencrypted PEM data.
*/
int pem_privkey(const dnssec_binary_t *pem, gnutls_privkey_t *key)
{
assert(pem);
assert(key);
gnutls_x509_privkey_t key_x509 = NULL;
int r = pem_x509(pem, &key_x509);
if (r != DNSSEC_EOK) {
return r;
}
gnutls_privkey_t key_abs = NULL;
r = gnutls_privkey_init(&key_abs);
if (r != GNUTLS_E_SUCCESS) {
gnutls_x509_privkey_deinit(key_x509);
return DNSSEC_ENOMEM;
}
int flags = GNUTLS_PRIVKEY_IMPORT_AUTO_RELEASE;
r = gnutls_privkey_import_x509(key_abs, key_x509, flags);
if (r != GNUTLS_E_SUCCESS) {
gnutls_x509_privkey_deinit(key_x509);
gnutls_privkey_deinit(key_abs);
return DNSSEC_ENOMEM;
}
*key = key_abs;
return DNSSEC_EOK;
}
/*!
* Generate new key and export it in the PEM format.
*/
int pem_generate(gnutls_pk_algorithm_t algorithm, unsigned bits,
dnssec_binary_t *pem, char **id)
{
assert(pem);
assert(id);
// generate key
_cleanup_x509_privkey_ gnutls_x509_privkey_t key = NULL;
int r = gnutls_x509_privkey_init(&key);
if (r != GNUTLS_E_SUCCESS) {
return DNSSEC_ENOMEM;
}
r = gnutls_x509_privkey_generate(key, algorithm, bits, 0);
if (r != GNUTLS_E_SUCCESS) {
return DNSSEC_KEY_GENERATE_ERROR;
}
// convert to PEM and export the ID
dnssec_binary_t _pem = { 0 };
r = pem_from_x509(key, &_pem);
if (r != DNSSEC_EOK) {
return r;
}
// export key ID
char *_id = NULL;
r = keyid_x509_hex(key, &_id);
if (r != DNSSEC_EOK) {
dnssec_binary_free(&_pem);
return r;
}
*id = _id;
*pem = _pem;
return DNSSEC_EOK;
}
static int try_export_pem(gnutls_x509_privkey_t key, dnssec_binary_t *pem)
{
assert(key);
gnutls_x509_crt_fmt_t format = GNUTLS_X509_FMT_PEM;
char *password = NULL;
int flags = GNUTLS_PKCS_PLAIN;
return gnutls_x509_privkey_export_pkcs8(key, format, password, flags,
pem->data, &pem->size);
}
/*!
* Export GnuTLS X.509 private key to PEM binary.
*/
int pem_from_x509(gnutls_x509_privkey_t key, dnssec_binary_t *pem)
{
assert(key);
assert(pem);
dnssec_binary_t _pem = { 0 };
int r = try_export_pem(key, &_pem);
if (r != GNUTLS_E_SHORT_MEMORY_BUFFER || _pem.size == 0) {
return DNSSEC_KEY_EXPORT_ERROR;
}
r = dnssec_binary_alloc(&_pem, _pem.size);
if (r != DNSSEC_EOK) {
return r;
}
r = try_export_pem(key, &_pem);
if (r != GNUTLS_E_SUCCESS) {
dnssec_binary_free(&_pem);
return DNSSEC_KEY_EXPORT_ERROR;
}
*pem = _pem;
return DNSSEC_EOK;
}
/*!
* Get key ID of a private key in PEM format.
*/
int pem_keyid(const dnssec_binary_t *pem, char **id)
{
assert(pem && pem->size > 0 && pem->data);
assert(id);
_cleanup_x509_privkey_ gnutls_x509_privkey_t key = NULL;
int r = pem_x509(pem, &key);
if (r != DNSSEC_EOK) {
return r;
}
return keyid_x509_hex(key, id);
}
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