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/* Copyright (C) 2019 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 <assert.h>
#include <string.h>
#include "contrib/getline.h"
#include "contrib/string.h"
#include "libdnssec/error.h"
#include "libknot/attribute.h"
#include "libknot/errcode.h"
#include "libknot/tsig.h"
_public_
void knot_tsig_key_deinit(knot_tsig_key_t *key)
{
if (!key) {
return;
}
knot_dname_free(key->name, NULL);
memzero(key->secret.data, key->secret.size);
dnssec_binary_free(&key->secret);
memzero(key, sizeof(*key));
}
_public_
int knot_tsig_key_init(knot_tsig_key_t *key, const char *algorithm_name,
const char *name, const char *secret_b64)
{
if (!name || !secret_b64 || !key) {
return KNOT_EINVAL;
}
dnssec_tsig_algorithm_t algorithm = DNSSEC_TSIG_HMAC_SHA256;
if (algorithm_name != NULL) {
algorithm = dnssec_tsig_algorithm_from_name(algorithm_name);
if (algorithm == DNSSEC_TSIG_UNKNOWN) {
return KNOT_EMALF;
}
}
knot_dname_t *dname = knot_dname_from_str_alloc(name);
if (!dname) {
return KNOT_ENOMEM;
}
knot_dname_to_lower(dname);
dnssec_binary_t b64secret = { 0 };
b64secret.data = (uint8_t *)secret_b64;
b64secret.size = strlen(secret_b64);
dnssec_binary_t secret = { 0 };
int result = dnssec_binary_from_base64(&b64secret, &secret);
if (result != KNOT_EOK) {
knot_dname_free(dname, NULL);
return result;
}
key->name = dname;
key->algorithm = algorithm;
key->secret = secret;
return KNOT_EOK;
}
_public_
int knot_tsig_key_init_str(knot_tsig_key_t *key, const char *params)
{
if (!params) {
return KNOT_EINVAL;
}
char *copy = strstrip(params);
if (!copy) {
return KNOT_ENOMEM;
}
size_t copy_size = strlen(copy) + 1;
// format [algorithm:]name:secret
char *algorithm = NULL;
char *name = NULL;
char *secret = NULL;
// find secret
char *pos = strrchr(copy, ':');
if (pos) {
*pos = '\0';
secret = pos + 1;
} else {
memzero(copy, copy_size);
free(copy);
return KNOT_EMALF;
}
// find name and optionally algorithm
pos = strchr(copy, ':');
if (pos) {
*pos = '\0';
algorithm = copy;
name = pos + 1;
} else {
name = copy;
}
int result = knot_tsig_key_init(key, algorithm, name, secret);
memzero(copy, copy_size);
free(copy);
return result;
}
_public_
int knot_tsig_key_init_file(knot_tsig_key_t *key, const char *filename)
{
if (!filename) {
return KNOT_EINVAL;
}
FILE *file = fopen(filename, "r");
if (!file) {
return KNOT_EACCES;
}
char *line = NULL;
size_t line_size = 0;
ssize_t read = knot_getline(&line, &line_size, file);
fclose(file);
if (read == -1) {
return KNOT_EMALF;
}
int result = knot_tsig_key_init_str(key, line);
memzero(line, line_size);
free(line);
return result;
}
_public_
int knot_tsig_key_copy(knot_tsig_key_t *dst, const knot_tsig_key_t *src)
{
if (!src || !dst) {
return KNOT_EINVAL;
}
knot_tsig_key_t copy = { 0 };
copy.algorithm = src->algorithm;
copy.name = knot_dname_copy(src->name, NULL);
if (!copy.name) {
return KNOT_ENOMEM;
}
if (dnssec_binary_dup(&src->secret, ©.secret) != DNSSEC_EOK) {
knot_tsig_key_deinit(©);
return KNOT_ENOMEM;
}
*dst = copy;
return KNOT_EOK;
}
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