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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 02110-1301 USA */
#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, "");
static MYSQL_SYSVAR_ENUM(encryption_algorithm, encryption_algorithm,
PLUGIN_VAR_RQCMDARG | PLUGIN_VAR_READONLY,
"Encryption algorithm to use.",
NULL, NULL, 0, &encryption_algorithm_typelib);
static struct st_mysql_sys_var* settings[] = {
MYSQL_SYSVAR(filename),
MYSQL_SYSVAR(filekey),
MYSQL_SYSVAR(encryption_algorithm),
NULL
};
Dynamic_array<keyentry> keys(static_cast<uint>(0));
static keyentry *get_key(unsigned int key_id)
{
keyentry *a= keys.front(), *b= keys.back() + 1, *c;
while (b - a > 1)
{
c= a + (b - a)/2;
if (c->id == key_id)
return c;
else if (c->id < key_id)
a= c;
else
b= c;
}
return a->id == key_id ? a : 0;
}
/**
This method is using with the id 0 if exists.
This method is used by innobase/xtradb for the key
rotation feature of encrypting log files.
*/
static unsigned int get_highest_key_used_in_key_file()
{
return 0;
}
static unsigned int get_key_from_key_file(unsigned int key_id,
unsigned char* dstbuf, unsigned *buflen)
{
keyentry* entry = get_key(key_id);
if (entry == NULL)
return BAD_ENCRYPTION_KEY_VERSION;
if (*buflen < entry->length)
{
*buflen= entry->length;
return KEY_BUFFER_TOO_SMALL;
}
*buflen= entry->length;
if (dstbuf)
memcpy(dstbuf, entry->key, entry->length);
return 0;
}
struct st_mariadb_encryption file_key_management_plugin= {
MariaDB_ENCRYPTION_INTERFACE_VERSION,
get_highest_key_used_in_key_file,
get_key_from_key_file,
0,0
};
static int file_key_management_plugin_init(void *p)
{
Parser parser(filename, filekey);
switch (encryption_algorithm) {
case 0: // AES_CBC
file_key_management_plugin.encrypt=
(encrypt_decrypt_func)my_aes_encrypt_cbc;
file_key_management_plugin.decrypt=
(encrypt_decrypt_func)my_aes_decrypt_cbc;
break;
#ifdef HAVE_EncryptAes128Ctr
case 1: // AES_CTR
file_key_management_plugin.encrypt=
(encrypt_decrypt_func)my_aes_encrypt_ctr;
file_key_management_plugin.decrypt=
(encrypt_decrypt_func)my_aes_decrypt_ctr;
break;
#endif
default:
return 1; // cannot happen
}
return parser.parse(&keys);
}
/*
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,
NULL,
0x0100 /* 1.0 */,
NULL, /* status variables */
settings,
"1.0",
MariaDB_PLUGIN_MATURITY_ALPHA
}
maria_declare_plugin_end;
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