99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/*
|
|
luksrku - Tool to remotely unlock LUKS disks using TLS.
|
|
Copyright (C) 2016-2019 Johannes Bauer
|
|
|
|
This file is part of luksrku.
|
|
|
|
luksrku 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; this program is ONLY licensed under
|
|
version 3 of the License, later versions are explicitly excluded.
|
|
|
|
luksrku 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 luksrku; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
Johannes Bauer <JohannesBauer@gmx.de>
|
|
*/
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdbool.h>
|
|
#include <openssl/crypto.h>
|
|
|
|
#include "keydb.h"
|
|
#include "util.h"
|
|
#include "log.h"
|
|
|
|
static unsigned int keydb_getsize_hostcount(unsigned int host_count) {
|
|
return sizeof(struct keydb_t) + (host_count * sizeof(struct host_entry_t));
|
|
}
|
|
|
|
static unsigned int keydb_getsize(const struct keydb_t *keydb) {
|
|
return keydb_getsize_hostcount(keydb->host_count);
|
|
}
|
|
|
|
struct keydb_t* keydb_new(void) {
|
|
struct keydb_t *keydb = calloc(sizeof(struct keydb_t), 1);
|
|
keydb->keydb_version = KEYDB_VERSION;
|
|
keydb->server_database = true;
|
|
return keydb;
|
|
}
|
|
|
|
void keydb_free(struct keydb_t *keydb) {
|
|
memset(keydb, 0, keydb_getsize(keydb));
|
|
free(keydb);
|
|
}
|
|
|
|
struct keydb_t* keydb_add_host(struct keydb_t *keydb, const char *hostname) {
|
|
struct keydb_t *new_keydb = realloc(keydb, keydb_getsize_hostcount(keydb->host_count + 1));
|
|
if (!new_keydb) {
|
|
return NULL;
|
|
}
|
|
|
|
memset(&new_keydb->hosts[new_keydb->host_count], 0, sizeof(struct host_entry_t));
|
|
new_keydb->host_count++;
|
|
return new_keydb;
|
|
}
|
|
|
|
bool keydb_write(const struct keydb_t *keydb, const char *filename, const char *passphrase) {
|
|
enum kdf_t kdf;
|
|
if ((!passphrase) || (strlen(passphrase) == 0)) {
|
|
/* For empty password, we can also use garbage KDF */
|
|
kdf = KDF_PBKDF2_SHA256_1000;
|
|
} else {
|
|
kdf = KDF_SCRYPT_N17_r8_p1;
|
|
}
|
|
return write_encrypted_file(filename, keydb, keydb_getsize(keydb), passphrase, kdf);
|
|
}
|
|
|
|
struct keydb_t* keydb_read(const char *filename) {
|
|
struct decrypted_file_t decrypted_file = read_encrypted_file(filename);
|
|
if (!decrypted_file.success) {
|
|
return NULL;
|
|
}
|
|
|
|
struct keydb_t *keydb = (struct keydb_t*)decrypted_file.data;
|
|
if (keydb->keydb_version != KEYDB_VERSION) {
|
|
log_msg(LLVL_ERROR, "keydb in %s could be read, but is of version %u (we expected %u).", keydb->keydb_version, KEYDB_VERSION);
|
|
OPENSSL_cleanse(decrypted_file.data, decrypted_file.data_length);
|
|
free(decrypted_file.data);
|
|
return NULL;
|
|
}
|
|
|
|
if (decrypted_file.data_length != keydb_getsize(keydb)) {
|
|
log_msg(LLVL_ERROR, "keydb in %s could be read, but was %u bytes long (we expected %u).", decrypted_file.data_length, keydb_getsize(keydb));
|
|
OPENSSL_cleanse(decrypted_file.data, decrypted_file.data_length);
|
|
free(decrypted_file.data);
|
|
return NULL;
|
|
}
|
|
|
|
return keydb;
|
|
}
|