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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 <https://www.gnu.org/licenses/>.
*/
#include <gnutls/abstract.h>
#include <gnutls/gnutls.h>
#include "libdnssec/binary.h"
#include "libdnssec/error.h"
#include "libdnssec/key/algorithm.h"
#include "libdnssec/key/convert.h"
#include "libdnssec/key/dnskey.h"
#include "libdnssec/key/internal.h"
#include "libdnssec/key/privkey.h"
#include "libdnssec/shared/shared.h"
#include "libdnssec/shared/binary_wire.h"
/* -- internal functions --------------------------------------------------- */
/*!
* Check if the algorithm number is valid for given DNSKEY.
*/
static bool valid_algorithm(dnssec_key_t *key, gnutls_privkey_t privkey)
{
uint8_t current = dnssec_key_get_algorithm(key);
int gnu_algorithm = gnutls_privkey_get_pk_algorithm(privkey, NULL);
return (gnu_algorithm == algorithm_to_gnutls(current));
}
/*!
* Create GnuTLS public key from private key.
*/
static int public_from_private(gnutls_privkey_t privkey, gnutls_pubkey_t *pubkey)
{
assert(privkey);
assert(pubkey);
gnutls_pubkey_t new_key = NULL;
int result = gnutls_pubkey_init(&new_key);
if (result != GNUTLS_E_SUCCESS) {
return DNSSEC_ENOMEM;
}
result = gnutls_pubkey_import_privkey(new_key, privkey, 0, 0);
if (result != GNUTLS_E_SUCCESS) {
gnutls_pubkey_deinit(new_key);
return DNSSEC_KEY_IMPORT_ERROR;
}
*pubkey = new_key;
return DNSSEC_EOK;
}
/*!
* Create public key (GnuTLS and DNSKEY RDATA) from a private key.
*/
static int create_public_key(gnutls_privkey_t privkey,
gnutls_pubkey_t *pubkey_ptr,
dnssec_binary_t *rdata)
{
assert(privkey);
assert(pubkey_ptr);
assert(rdata);
// crypto public key
gnutls_pubkey_t pubkey = NULL;
int result = public_from_private(privkey, &pubkey);
if (result != DNSSEC_EOK) {
return result;
}
// dnssec public key
_cleanup_binary_ dnssec_binary_t rdata_pubkey = { 0 };
result = convert_pubkey_to_dnskey(pubkey, &rdata_pubkey);
if (result != DNSSEC_EOK) {
gnutls_pubkey_deinit(pubkey);
return result;
}
size_t rdata_size = DNSKEY_RDATA_OFFSET_PUBKEY + rdata_pubkey.size;
result = dnssec_binary_resize(rdata, rdata_size);
if (result != DNSSEC_EOK) {
gnutls_pubkey_deinit(pubkey);
return result;
}
// updated RDATA
wire_ctx_t wire = binary_init(rdata);
wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PUBKEY);
binary_write(&wire, &rdata_pubkey);
assert(wire_ctx_offset(&wire) == rdata->size);
*pubkey_ptr = pubkey;
return DNSSEC_EOK;
}
/* -- internal API --------------------------------------------------------- */
/*!
* Load a private key into a DNSSEC key, create a public part if necessary.
*/
int key_set_private_key(dnssec_key_t *key, gnutls_privkey_t privkey)
{
assert(key);
assert(privkey);
assert(key->private_key == NULL);
if (!valid_algorithm(key, privkey)) {
return DNSSEC_INVALID_KEY_ALGORITHM;
}
if (!key->public_key) {
int r = create_public_key(privkey, &key->public_key, &key->rdata);
if (r != DNSSEC_EOK) {
return r;
}
}
key->private_key = privkey;
return DNSSEC_EOK;
}
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