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/* Copyright (C) 2015 MariaDB
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 <mysql/plugin_encryption.h>
#include "log.h"
#include "sql_plugin.h"
#include <my_crypt.h>
/* there can be only one encryption plugin enabled */
static plugin_ref encryption_manager= 0;
struct encryption_service_st encryption_handler;
extern "C" {
uint no_get_key(uint, uint, uchar*, uint*)
{
return ENCRYPTION_KEY_VERSION_INVALID;
}
uint no_key(uint)
{
return ENCRYPTION_KEY_VERSION_INVALID;
}
uint zero_size(uint,uint)
{
return 0;
}
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, MY_AES_CBC, flags, key, klen, iv, ivlen);
}
static unsigned int get_length(unsigned int slen, unsigned int key_id,
unsigned int key_version)
{
return my_aes_get_size(MY_AES_CBC, slen);
}
uint ctx_size(unsigned int, unsigned int)
{
return MY_AES_CTX_SIZE;
}
} /* extern "C" */
int initialize_encryption_plugin(st_plugin_int *plugin)
{
if (encryption_manager)
return 1;
if (plugin->plugin->init && plugin->plugin->init(plugin))
{
sql_print_error("Plugin '%s' init function returned error.",
plugin->name.str);
return 1;
}
encryption_manager= plugin_lock(NULL, plugin_int_to_ref(plugin));
st_mariadb_encryption *handle=
(struct st_mariadb_encryption*) plugin->plugin->info;
/*
Compiler on Spark doesn't like the '?' operator here as it
believes the (uint (*)...) implies the C++ call model.
*/
if (handle->crypt_ctx_size)
encryption_handler.encryption_ctx_size_func= handle->crypt_ctx_size;
else
encryption_handler.encryption_ctx_size_func= ctx_size;
encryption_handler.encryption_ctx_init_func=
handle->crypt_ctx_init ? handle->crypt_ctx_init : ctx_init;
encryption_handler.encryption_ctx_update_func=
handle->crypt_ctx_update ? handle->crypt_ctx_update : my_aes_crypt_update;
encryption_handler.encryption_ctx_finish_func=
handle->crypt_ctx_finish ? handle->crypt_ctx_finish : my_aes_crypt_finish;
encryption_handler.encryption_encrypted_length_func=
handle->encrypted_length ? handle->encrypted_length : get_length;
encryption_handler.encryption_key_get_func=
handle->get_key;
encryption_handler.encryption_key_get_latest_version_func=
handle->get_latest_key_version; // must be the last
return 0;
}
int finalize_encryption_plugin(st_plugin_int *plugin)
{
bool used= plugin_ref_to_int(encryption_manager) == plugin;
if (used)
{
encryption_handler.encryption_key_get_func= no_get_key;
encryption_handler.encryption_key_get_latest_version_func= no_key;
encryption_handler.encryption_ctx_size_func= zero_size;
}
if (plugin && plugin->plugin->deinit && plugin->plugin->deinit(NULL))
{
DBUG_PRINT("warning", ("Plugin '%s' deinit function returned error.",
plugin->name.str));
}
if (used)
{
plugin_unlock(NULL, encryption_manager);
encryption_manager= 0;
}
return 0;
}
/******************************************************************
Encryption Scheme service
******************************************************************/
static uint scheme_get_key(st_encryption_scheme *scheme,
st_encryption_scheme_key *key)
{
if (scheme->locker)
scheme->locker(scheme, 0);
// Check if we already have key
for (uint i = 0; i < array_elements(scheme->key); i++)
{
if (scheme->key[i].version == 0) // no more keys
break;
if (scheme->key[i].version == key->version)
{
*key= scheme->key[i];
if (scheme->locker)
scheme->locker(scheme, 1);
return 0;
}
}
// Not found!
scheme->keyserver_requests++;
uchar global_key[MY_AES_MAX_KEY_LENGTH];
uint global_key_len= sizeof(global_key), key_len;
uint rc = encryption_key_get(scheme->key_id, key->version,
global_key, & global_key_len);
if (rc)
goto ret;
/* Now generate the local key by encrypting IV using the global key */
rc = my_aes_crypt(MY_AES_ECB, ENCRYPTION_FLAG_ENCRYPT | ENCRYPTION_FLAG_NOPAD,
scheme->iv, sizeof(scheme->iv), key->key, &key_len,
global_key, global_key_len, NULL, 0);
DBUG_ASSERT(key_len == sizeof(key->key));
if (rc)
goto ret;
// Rotate keys to make room for a new
for (uint i = array_elements(scheme->key) - 1; i; i--)
scheme->key[i] = scheme->key[i - 1];
scheme->key[0]= *key;
ret:
if (scheme->locker)
scheme->locker(scheme, 1);
return rc;
}
int do_crypt(const unsigned char* src, unsigned int slen,
unsigned char* dst, unsigned int* dlen,
struct st_encryption_scheme *scheme,
unsigned int key_version, unsigned int i32_1,
unsigned int i32_2, unsigned long long i64,
int flag)
{
compile_time_assert(ENCRYPTION_SCHEME_KEY_INVALID ==
(int)ENCRYPTION_KEY_VERSION_INVALID);
// Maybe temporal solution for MDEV-8173
// Rationale: scheme->type is currently global/object
// and when used here might not represent actual state
// of smaller granularity objects e.g. InnoDB page state
// as type is stored to tablespace (FIL) and could represent
// state where key rotation is trying to reach
//DBUG_ASSERT(scheme->type == 1);
if (key_version == ENCRYPTION_KEY_VERSION_INVALID ||
key_version == ENCRYPTION_KEY_NOT_ENCRYPTED)
return ENCRYPTION_SCHEME_KEY_INVALID;
st_encryption_scheme_key key;
key.version= key_version;
uint rc= scheme_get_key(scheme, &key);
if (rc)
return (int)rc;
unsigned char iv[4 + 4 + 8];
int4store(iv + 0, i32_1);
int4store(iv + 4, i32_2);
int8store(iv + 8, i64);
return encryption_crypt(src, slen, dst, dlen, key.key, sizeof(key.key),
iv, sizeof(iv), flag, scheme->key_id, key_version);
}
int encryption_scheme_encrypt(const unsigned char* src, unsigned int slen,
unsigned char* dst, unsigned int* dlen,
struct st_encryption_scheme *scheme,
unsigned int key_version, unsigned int i32_1,
unsigned int i32_2, unsigned long long i64)
{
return do_crypt(src, slen, dst, dlen, scheme, key_version, i32_1,
i32_2, i64, ENCRYPTION_FLAG_NOPAD | ENCRYPTION_FLAG_ENCRYPT);
}
int encryption_scheme_decrypt(const unsigned char* src, unsigned int slen,
unsigned char* dst, unsigned int* dlen,
struct st_encryption_scheme *scheme,
unsigned int key_version, unsigned int i32_1,
unsigned int i32_2, unsigned long long i64)
{
return do_crypt(src, slen, dst, dlen, scheme, key_version, i32_1,
i32_2, i64, ENCRYPTION_FLAG_NOPAD | ENCRYPTION_FLAG_DECRYPT);
}
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