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/* Copyright (c) 2002, 2012, eperi GmbH.
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; version 2 of the License.
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, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
#include <my_global.h>
#include <typelib.h>
#include "parser.h"
#include <mysql/plugin_encryption.h>
#include <string.h>
static char* filename;
static char* filekey;
static unsigned long encryption_algorithm;
static const char *encryption_algorithm_names[]=
{
"aes_cbc",
#ifdef HAVE_EncryptAes128Ctr
"aes_ctr",
#endif
0
};
static TYPELIB encryption_algorithm_typelib=
{
array_elements(encryption_algorithm_names)-1,"",
encryption_algorithm_names, NULL
};
static MYSQL_SYSVAR_STR(filename, filename,
PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
"Path and name of the key file.",
NULL, NULL, "");
static MYSQL_SYSVAR_STR(filekey, filekey,
PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
"Key to encrypt / decrypt the keyfile.",
NULL, NULL, "");
#ifdef HAVE_EncryptAes128Ctr
#define recommendation ", aes_ctr is the recommended one"
#else
#define recommendation ""
#endif
static MYSQL_SYSVAR_ENUM(encryption_algorithm, encryption_algorithm,
PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
"Encryption algorithm to use" recommendation ".",
NULL, NULL, 0, &encryption_algorithm_typelib);
static struct st_mysql_sys_var* settings[] = {
MYSQL_SYSVAR(filename),
MYSQL_SYSVAR(filekey),
MYSQL_SYSVAR(encryption_algorithm),
NULL
};
std::map<unsigned int,keyentry> keys;
static keyentry *get_key(unsigned int key_id)
{
keyentry &key= keys[key_id];
if (key.id == 0)
return 0;
return &key;
}
/* the version is always the same, no automatic key rotation */
static unsigned int get_latest_version(uint key_id)
{
return get_key(key_id) ? 1 : ENCRYPTION_KEY_VERSION_INVALID;
}
static unsigned int get_key_from_key_file(unsigned int key_id,
unsigned int key_version, unsigned char* dstbuf, unsigned *buflen)
{
if (key_version != 1)
return ENCRYPTION_KEY_VERSION_INVALID;
keyentry* entry = get_key(key_id);
if (entry == NULL)
return ENCRYPTION_KEY_VERSION_INVALID;
if (*buflen < entry->length)
{
*buflen= entry->length;
return ENCRYPTION_KEY_BUFFER_TOO_SMALL;
}
*buflen= entry->length;
if (dstbuf)
memcpy(dstbuf, entry->key, entry->length);
return 0;
}
// let's simplify the condition below
#ifndef HAVE_EncryptAes128Gcm
#define MY_AES_GCM MY_AES_CTR
#ifndef HAVE_EncryptAes128Ctr
#define MY_AES_CTR MY_AES_CBC
#endif
#endif
static inline enum my_aes_mode mode(int flags)
{
/*
If encryption_algorithm is AES_CTR then
if no-padding, use AES_CTR
else use AES_GCM (like CTR but appends a "checksum" block)
else
use AES_CBC
*/
if (encryption_algorithm)
if (flags & ENCRYPTION_FLAG_NOPAD)
return MY_AES_CTR;
else
return MY_AES_GCM;
else
return MY_AES_CBC;
}
static int ctx_init(void *ctx, const unsigned char* key, unsigned int klen,
const unsigned char* iv, unsigned int ivlen, int flags,
unsigned int key_id, unsigned int key_version)
{
return my_aes_crypt_init(ctx, mode(flags), flags, key, klen, iv, ivlen);
}
static int ctx_update(void *ctx, const unsigned char *src, unsigned int slen,
unsigned char *dst, unsigned int *dlen)
{
return my_aes_crypt_update(ctx, src, slen, dst, dlen);
}
static int ctx_finish(void *ctx, unsigned char *dst, unsigned int *dlen)
{
return my_aes_crypt_finish(ctx, dst, dlen);
}
static unsigned int get_length(unsigned int slen, unsigned int key_id,
unsigned int key_version)
{
return my_aes_get_size(mode(0), slen);
}
static uint ctx_size(uint, uint)
{
return my_aes_ctx_size(mode(0));
}
struct st_mariadb_encryption file_key_management_plugin= {
MariaDB_ENCRYPTION_INTERFACE_VERSION,
get_latest_version,
get_key_from_key_file,
ctx_size,
ctx_init,
ctx_update,
ctx_finish,
get_length
};
static int file_key_management_plugin_init(void *p)
{
Parser parser(filename, filekey);
return parser.parse(&keys);
}
static int file_key_management_plugin_deinit(void *p)
{
keys.clear();
return 0;
}
/*
Plugin library descriptor
*/
maria_declare_plugin(file_key_management)
{
MariaDB_ENCRYPTION_PLUGIN,
&file_key_management_plugin,
"file_key_management",
"Denis Endro eperi GmbH",
"File-based key management plugin",
PLUGIN_LICENSE_GPL,
file_key_management_plugin_init,
file_key_management_plugin_deinit,
0x0100 /* 1.0 */,
NULL, /* status variables */
settings,
"1.0",
MariaDB_PLUGIN_MATURITY_STABLE
}
maria_declare_plugin_end;
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