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/* Copyright (C) 2022 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 "libdnssec/binary.h"
#include "libdnssec/error.h"
#include "libdnssec/key/dnskey.h"
#include "libdnssec/key/convert.h"
#include "libdnssec/shared/binary_wire.h"
/* -- internal API --------------------------------------------------------- */
/*!
* Update 'Public key' field of DNSKEY RDATA.
*/
int dnskey_rdata_set_pubkey(dnssec_binary_t *rdata, const dnssec_binary_t *pubkey)
{
assert(rdata);
assert(pubkey);
size_t new_size = DNSKEY_RDATA_OFFSET_PUBKEY + pubkey->size;
int result = dnssec_binary_resize(rdata, new_size);
if (result != DNSSEC_EOK) {
return result;
}
wire_ctx_t wire = binary_init(rdata);
wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PUBKEY);
binary_write(&wire, pubkey);
assert(wire_ctx_offset(&wire) == rdata->size);
return DNSSEC_EOK;
}
/*!
* Create a GnuTLS public key from DNSKEY RDATA.
*
* \param rdata DNSKEY RDATA.
* \param key_ptr Resulting public key.
*/
int dnskey_rdata_to_crypto_key(const dnssec_binary_t *rdata, gnutls_pubkey_t *key_ptr)
{
assert(rdata);
assert(key_ptr);
uint8_t algorithm = 0, protocol = 0, flags_hi = 0;
dnssec_binary_t rdata_pubkey = { 0 };
wire_ctx_t wire = binary_init(rdata);
wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_FLAGS);
flags_hi = wire_ctx_read_u8(&wire);
wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PROTOCOL);
protocol = wire_ctx_read_u8(&wire);
if (flags_hi != 0x1 || protocol != 0x3) {
return DNSSEC_INVALID_PUBLIC_KEY;
}
wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_ALGORITHM);
algorithm = wire_ctx_read_u8(&wire);
wire_ctx_set_offset(&wire, DNSKEY_RDATA_OFFSET_PUBKEY);
binary_available(&wire, &rdata_pubkey);
gnutls_pubkey_t key = NULL;
int result = gnutls_pubkey_init(&key);
if (result != GNUTLS_E_SUCCESS) {
return DNSSEC_ENOMEM;
}
result = convert_dnskey_to_pubkey(algorithm, &rdata_pubkey, key);
if (result != DNSSEC_EOK) {
gnutls_pubkey_deinit(key);
return result;
}
*key_ptr = key;
return DNSSEC_EOK;
}
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