Do you manage your infrastructure using terraform?
Are you duplicating your code for creating environments like DEV, STAGING, QA or PROD?
Are you tired of writing/managing different codes for your different environments with several complexities?
Well there is a native solution from terraform called as “TERRAFORM WORKSPACE”
Before we dive deep, let’s have a brief introduction to terraform
Word “data” is very crucial since early 2000 and within a span of these 2 decades is it becoming more crucial. According to Forbes Google believe that in future every organisation will lead to becoming a data company. Well, when it comes to data, security is one of the major concerns that we have to face.
We have several common techniques to store data in today’s environment like MySql, Oracle, MsSql, Cassandra, Mongo etc and these techs will keep on changing in future. But according to DataAnyz, MySql Still has a 33% share of the market. So here we are with a technique to secure our MySQL data.
Before getting more into this article, let us know what are possible combined approaches to secure MySQL data
Mysql Server hardening
Mysql Application-level hardening
Mysql data encryption at transit
Mysql data at rest encryption
Mysql Disk Encryption
You may explore all the approaches but in this article, we will understand the concept of Mysql data at encryption and hands-on too.
The concept of “Data at Rest Encryption” in MySQL was introduced in Mysql 5.7 with the initial support of InnoDB storage engine only and with the period it has evolved significantly. So let’s understand about “Data at Rest Encryption” in MySQL
What is “Data at Rest Encryption” in MySql?
The concept of “data at rest encryption” uses two-tier encryption key architecture, which used below two keys
Tablespace keys: This is an encrypted key which is stored in the tablespace header
Master Key: the Master key is used to decrypt the tablespace keys
So let’s Understand its working
Let’s say we have a running MySQL with InnoDB storage engine and tablespace is encrypted using a key, referred as table space key. This key is then encrypted using a master key and stored in the tablespace header
Now when a request is made to access MySQL data, InnoDB use master key to decrypt tablespace key present tablespace header. After getting decrypted tablespace key, the tablespace is decrypted and make is available to perform read/write operations
Note: The decrypted version of a tablespace key never changes, but the master key can be rotated.
Data at rest encryption implemented using keyring file plugin to manage and encrypt the master key
After understanding the concept of encryption and decryption below are few Pros and Cons for using DRE
Pros:
A strong Encryption of AES 256 is used to encrypt the InnoDB tables
It is transparent to all applications as we don’t need any application code, schema, or data type changes
Key management is not done by DBA.
Keys can be securely stored away from the data and key rotation is very simple.
Cons:
Encrypts only InnoDB tables
Can’t encrypt binary logs, redo logs, relay logs on unencrypted slaves, slow log, error log, general log, and audit log
Though we can’t encrypt binary logs, redo logs, relay logs on Mysql 5.7 but MariaDB has implemented this with a mechanism to encrypt undo/redo logs, binary logs/relay logs, etc. by enabling few flags in MariaDB Config File
Let’s Discuss its problem/solutions and few solutions to them
Running MySQL on a host will have access from root user and the MySQL user and both of them may access key file(keyring file) present on the same system. For this problem, we may have our keys on mount/unmount drive which can be unmounted after restarting MySQL.
Data will not be in encrypted form when it will get loaded onto the RAM and can be dumped and read
If MySQL is restarted with skip-grant-tables then again it’s havoc but this can be eliminated using an unmounted drive for keyring
As tablespace key remains the same so our security relies on Master key rotation which can be used to save our master key
NOTE: Do not to lose the master key file, as we cant decrypt data and will suffer data loss
Doing Is Learning, so let’s try
As a prerequisite, we need a machine with MySQL server up and running Now for data at rest encryption to work we need to enable
Enable file per table on with the help of the configuration file.
[root@mysql ~]# vim /etc/my.cnf [mysqld]
innodb_file_per_table=ON
Along with the above parameter, enable keyring plugin and keyring path. This parameter should always be on the top in configuration so that it will get load initially when MySQL starts up. Keyring plugin is already installed in MySQL server we just need to enable it.
[root@mysql ~]# vim /etc/my.cnf [mysqld] early-plugin-load=keyring_file.so keyring_file_data=/var/lib/mysql/keyring-data/keyring innodb_file_per_table=ON
And save the file with a restart to MySQL
[root@mysql ~]# systemctl restart mysql
We can check for the enabled plugin and verify our configuration.
mysql> SELECT plugin_name, plugin_status FROM INFORMATION_SCHEMA.PLUGINS WHERE plugin_name LIKE 'keyring%'; +--------------+---------------+ | plugin_name | plugin_status | +--------------+---------------+ | keyring_file | ACTIVE | +--------------+---------------+ 1 rows in set (0.00 sec)
verify that we have a running keyring plugin and its location
mysql> show global variables like '%keyring%'; +--------------------+-------------------------------------+ | Variable_name | Value | +--------------------+-------------------------------------+ | keyring_file_data | /var/lib/mysql/keyring-data/keyring | | keyring_operations | ON | +--------------------+-------------------------------------+ 2 rows in set (0.00 sec)
Verify that we have enabled file per table
MariaDB [(none)]> show global variables like 'innodb_file_per_table'; +-----------------------+-------+ | Variable_name | Value | +-----------------------+-------+ | innodb_file_per_table | ON | +-----------------------+-------+ 1 row in set (0.33 sec)
Now we will test our set up by creating a test DB with a table and insert some value to the table using below commands
mysql> CREATE DATABASE test_db; mysql> CREATE TABLE test_db.test_db_table (id int primary key auto_increment, payload varchar(256)) engine=innodb; mysql> INSERT INTO test_db.test_db_table(payload) VALUES('Confidential Data');
After successful test data creation, run below command from the Linux shell to check whether you’re able to read InnoDB file for your created table i.e. Before encryption
Along with that, we see that our keyring file is also empty before encryption is enabled
[root@mysql ~]# strings /var/lib/mysql/test_db/test_db_table.ibd infimum supremum Confidential DATA
At this point of time if we try to check our keyring file we will not find anything
Now let’s encrypt our table with below command and check our InnoDB file and keyring file content.
mysql> ALTER TABLE test_db.test_db_table encryption='Y'; [root@mysql ~] strings /var/lib/mysql/test_db/test_db_table.ibd 0094ca6d-7ba9-11e9-b0d0-0800275716d42QMw
The above content clear that file data is not readable and table space is encrypted. As previously oy keyring file data was absent/empty, so now it must be having some data.
Note: Please look master Key and time stamp(we will implement key rotation )
[root@mysql ~] cat /var/lib/mysql/keyring-data/keyring Keyring file version:1.0?0 INNODBKey-0094ca6d-7ba9-11e9-b0d0-0800275716d4-2AES???_gd?7m>0??nz??8M??7Yʹ:ll8@?0 INNODBKey-0094ca6d-7ba9-11e9-b0d0-0800275716d4-1AES}??x?$F?z??$???:??k?6y?YEOF [root@mysql ~] ls -ltr /var/lib/mysql/keyring-data/keyring -rw-r----- 1 mysql mysql 283 Sep 18 16:48 /var/lib/mysql/keyring-data/keyring
With known security concern for the compromised master key, we may use the master key rotation technique from time to time to save our key.
You can encrypt data at rest by using keyring plugin and we can control and manage it by master key rotation. Creating an encrypted Mysql data file setup is as simple as firing a few simple commands. Using an encrypted system is also transparent to services, applications, and users with minimal impact of system resources. Further with Encryption of data at rest, we may also implement encryption in transit.
I hope you found this article informative and interesting. I’d really appreciate any and all feedback.