Data Encryption at Rest

Valerie Parham-Thompson
2016 October 26
DATA
ENCRYPTION
AT REST

WHAT’S THE PROBLEM?
OVERVIEWALTERNATIVES
YES, DEAR
KEY ROTATION
KEY STORAGE
THIRD-PARTYTOOLS
BACKUPS
PERFORMANCE
SUMMARY

OVERVIEW
PROTECTING DATA
It has been possible to protect data in transit
(moving over the network), and proper
authentication can be used to protect data in
use (being used by an application), but data at
rest (sitting on a ﬁle system) has been an area
of risk in MySQL/MariaDB.

OVERVIEW
WHAT ISTHE RISK?
Without encryption of data at rest, a bad actor
with access to the ﬁle system supporting the
database can view data even without proper
database-level permissions.
Having root access to the ﬁle system is very common!

OVERVIEW
WHAT IS SENSITIVE DATA?
PCI: credit card data
PII: names, drivers license, ﬁnancial data, social
security number
HIPAA: medical, health insurance data
See: https://en.wikipedia.org/wiki/California_S.B._1386

EXPOSED!
INSERT SENSITIVE DATA
MariaDB [allthingsopen]> create table t1 (
-> `intcol1` int(32) DEFAULT NULL,
-> `intcol2` int(32) DEFAULT NULL,
-> `charcol1` varchar(128) DEFAULT NULL,
-> `charcol2` varchar(128) DEFAULT NULL,
-> `charcol3` varchar(128) DEFAULT NULL
-> ) ENGINE=InnoDB DEFAULT
CHARSET=latin1;
MariaDB [allthingsopen]> insert into
allthingsopen.t1 values
(1,2,'my','secret','123-45-6789');
Query OK, 1 row affected (0.00 sec)

EXPOSED!
DATA FILES
[root@encr_maria ~]# ls -al /var/lib/mysql/
allthingsopen/
total 108
drwx------. 2 mysql mysql 45 Oct 19 15:09 .
drwxr-xr-x. 6 mysql mysql 4096 Oct 19 15:07 ..
-rw-rw----. 1 mysql mysql 65 Oct 19 15:07 db.opt
-rw-rw----. 1 mysql mysql 932 Oct 19 15:09 t1.frm
-rw-rw----. 1 mysql mysql 98304 Oct 19 15:09 t1.ibd
[root@encr_maria ~]# strings /var/lib/mysql/
allthingsopen/t1.ibd
...
mysecret123-45-6789

EXPOSED!
BINARY LOG
[root@encr_maria ~]# strings encr_maria-bin.000001
...
insert into allthingsopen.t1 values
(1,2,’my','secret','123-45-6789')
[root@encr_comm ~]# strings /var/lib/mysql/encr_comm-
bin.000001
...
secret
123-45-6789

EXPOSED!
REDO LOG
[root@encr_maria ~]# yum install vim-common
...
[root@encr_maria ~]# xxd /var/lib/mysql/ib_logfile0 | grep -v
"0000"
...
018a580: 0110 8000 0001 8000 0002 6d79 7365 6372 ..........mysecr
018a590: 6574 3132 332d 3435 2d36 3738 3982 0081 et123-45-6789...
[root@encr_comm ~]# xxd /var/lib/mysql/ib_logfile0 | grep -v
“0000"
...
0269ec0: 011b 0110 8000 0001 8000 0002 6d79 7365 ............myse
0269ed0: 6372 6574 3132 332d 3435 2d36 3738 3937 cret123-45-67897
(xxd is another command-line tool that allows you to see
text within binary ﬁles. Install vim-common to use it.)

BUT FIRST… SOME ALTERNATIVES
OVERVIEW
ALTERNATIVESYES, DEAR
KEY ROTATION
KEY STORAGE
THIRD-PARTYTOOLS
BACKUPS
PERFORMANCE
SUMMARY

ALTERNATIVES
OVERVIEW
• Don’t store sensitive data.
• Encrypt data from the application.
• Use column-level encryption.
• Encrypt the ﬁle system.

ALTERNATIVE
DON’T DO IT
• Outsource data storage.
• Don’t store data if you don’t have a legitimate
need for it.
• Regularly archive data from departed users or
data that has aged out.

ALTERNATIVE: ENCRYPT FROM APP
EXAMPLE OF ENCRYPTED DATA
MariaDB [allthingsopen]> select * from t1G
intcol1: 1
intcol2: 2
charcol1: my
charcol2: secret
charcol3: “?????-{??S@?/@%?>??????9?

NOTVISIBLE IN DATA FILES
...
mysecret"?????-{??S@?/
%?>???
???9?

NOTVISIBLE IN BINLOGS
[root@encr_maria ~]# xxd /var/lib/mysql/encr_maria-bin.000001
...
0001800: 0800 0049 4e53 4552 5420 494e 544f 2061 ...INSERT INTO a
0001810: 6c6c 7468 696e 6773 6f70 656e 2e74 310a llthingsopen.t1.
0001820: 2020 2020 2020 2020 2869 6e74 636f 6c31 (intcol1
0001830: 2c20 696e 7463 6f6c 322c 2063 6861 7263 , intcol2, charc
0001840: 6f6c 312c 2063 6861 7263 6f6c 322c 2063 ol1, charcol2, c
0001850: 6861 7263 6f6c 3329 0a20 2020 2020 2020 harcol3).
0001860: 2020 2020 2056 414c 5545 530a 2020 2020 VALUES.
0001870: 2020 2020 2831 2c20 322c 2027 6d79 272c (1, 2, 'my',
0001880: 2027 7365 6372 6574 272c 2027 5c22 9880 'secret', '"..
0001890: bdf3 ff2d 7bb5 e553 40a7 2f10 4013 25da ...-{..S@./.@.%.
00018a0: 863e 95cf 81a2 1fa6 ccce 39fe 1e27 29df .>........9..').
00018b0: d807 5810 0100 0000 1b00 0000 ca18 0000 ..X.............

NOTVISIBLE IN REDO LOG
ib_logfile0
...
mysecret"?????-{??S@?/
%?>???
???9?

ALTERNATIVE: COLUMN LEVEL
EXAMPLE OF INPUT AND OUTPUT
~ vparham$ mysql -h192.168.56.80 -uvalerie -pP@55word -e"SET
block_encryption_mode = 'aes-256-cbc'; SET @key_str = SHA2('correct
horse battery staple',512); SET @init_vector = RANDOM_BYTES(16); SET
@crypt_str = AES_ENCRYPT('123-45-6789',@key_str,@init_vector); INSERT
INTO allthingsopen.t1 values (1, 2, 'my', 'secret', @crypt_str);
SELECT charcol3 from allthingsopen.t1; SELECT
AES_DECRYPT(charcol3,@key_str,@init_vector) from allthingsopen.t1;"
+----------------------------+
| charcol3 |
+----------------------------+
| ûÕ‚?ŒÿPv¶K¾ìjµ> |
+----------------------------+
+---------------------------------------------+
| AES_DECRYPT(charcol3,@key_str,@init_vector) |
+---------------------------------------------+
| 123-45-6789 |
+---------------------------------------------+

[root@encr_comm ~]# xxd /var/lib/mysql/allthingsopen/
t1.ibd | grep -v 0000
...
000c090: 011a 0110 8000 0001 8000 0002 6d79 7365 ............myse
000c0a0: 6372 6574 fbd5 823f 8cff 5076 04b6 4bbe cret....?..Pv..K.

[root@encr_comm ~]# xxd /var/lib/mysql/encr_comm-bin.000001
...
0001480: e001 0000 0002 0000 0002 6d79 0673 6563 ..........my.sec
0001490: 7265 7410 fbd5 823f 8cff 5076 04b6 4bbe ret....?..Pv..K.
00014a0: ec6a b53e efac dece 65e0 0758 1001 0000 .j.>....e..X....
00014b0: 001f 0000 00c7 1400 0000 00a0 0000 0000 ................

NOTVISIBLE IN REDO LOGS
[root@encr_comm ~]# strings /var/lib/mysql/ib_logfile0
...
mysecret

ALTERNATIVE: FILE SYSTEM
EXAMPLE SETUP
[root@encr_fs_maria ~]# #add a new disk
[root@encr_fs_maria ~]# fdisk /dev/sdb
[root@encr_fs_maria ~]# mkfs.ext4 /dev/sdb1
[root@encr_fs_maria ~]# sudo systemctl stop mariadb
[root@encr_fs_maria ~]# mkdir /mnt/var
[root@encr_fs_maria ~]# mount /dev/sdb1 /mnt/var
[root@encr_fs_maria ~]# vi /etc/fstab
[root@encr_fs_maria ~]# rsync -a /var/lib/mysql/ /mnt/var/
[root@encr_fs_maria ~]# vi /etc/my.cnf.d/server.cnf
[root@encr_fs_maria ~]# sudo systemctl start mariadb
[root@encr_fs_maria ~]# sudo systemctl stop mariadb
[root@encr_fs_maria ~]# umount /dev/sdb1
[root@encr_fs_maria ~]# cryptsetup open /dev/sdb1 sda-crypt --type
plain
[root@encr_fs_maria ~]# dd if=/dev/sdb1 of=/dev/mapper/sda-crypt
bs=512
[root@encr_fs_maria ~]# mount /dev/mapper/sda-crypt /mnt/var/
[root@encr_fs_maria ~]# vi /etc/fstab
[root@encr_fs_maria ~]# cryptsetup open /dev/sdb1 sda-crypt --type
plain
[root@encr_fs_maria ~]# reboot
[root@encr_fs_maria ~]# mount /dev/mapper/sda-crypt /mnt/var/
[root@encr_fs_maria ~]# sudo systemctl start mariadb
Don’t do this.

READY FOR DATA ENCRYPTION AT REST?
OVERVIEW
ALTERNATIVES
YES, DEARKEY ROTATION
KEY STORAGE
THIRD-PARTYTOOLS
BACKUPS
PERFORMANCE
SUMMARY

YES, DEaR, MARIADB
CREATE KEY
[root@encr_maria ~]# openssl enc -aes-256-cbc -P -md sha1
enter aes-256-cbc encryption password:
Verifying - enter aes-256-cbc encryption password:
salt=1796388689D7D859
key=35BD497FFED9E420C4341F72AECF693AC74ACEB5B511AD27DD7E7CC6
8613C98C
iv =9FEE916B7B08389C9407CD9E6A67A304
[root@encr_maria ~]# vi /var/lib/mysql/keys.txt
[root@encr_maria ~]# cat /var/lib/mysql/keys.txt
1;9FEE916B7B08389C9407CD9E6A67A304;35BD497FFED9E420C4341F72A
ECF693AC74ACEB5B511AD27DD7E7CC68613C98C

YES, DEaR, MARIADB
EDIT CONFIG FILE
[root@encr_maria ~]# cat /etc/my.cnf
[mysqld]
plugin_load_add=file_key_management.so
file_key_management
file_key_management_filename = /var/lib/mysql/keys.txt
innodb-encrypt-tables
innodb-encryption-threads=4
innodb-encrypt-log
encrypt_binlog
encrypt-tmp-disk-tables=1
encrypt-tmp-files

YES, DEaR, MARIADB
ENCRYPTION CONFIGS ON
MariaDB [(none)]> show global variables like '%encr%';
+------------------------------------------+---------+
| Variable_name | Value |
+------------------------------------------+---------+
| aria_encrypt_tables | OFF |
| encrypt_binlog | ON |
| encrypt_tmp_disk_tables | ON |
| encrypt_tmp_files | ON |
| file_key_management_encryption_algorithm | aes_cbc |
| innodb_default_encryption_key_id | 1 |
| innodb_encrypt_log | ON |
| innodb_encrypt_tables | ON |
| innodb_encryption_rotate_key_age | 1 |
| innodb_encryption_rotation_iops | 100 |
| innodb_encryption_threads | 4 |
+------------------------------------------+---------+

YES, DEaR, MARIADB
ENCRYPTION METHODS
There are three ways to encrypt table data in MariaDB 10.1:
• innodb_encrypt_tables in the my.cnf will encrypt all tables (unless
speciﬁed as “encrypted=no”).
• innodb_encrypt_tables=FORCE in the my.cnf will encrypt all new
tables created, and will prevent table creation with “encrypted=no.”
• If the conﬁguration innodb_encrypt_tables is not in the my.cnf, but
the plugin is present, you can explicitly encrypt a table by including
“encrypted=yes” in the table creation statement.
(If innodb_encryption_threads is set higher than 0, then existing
tables will be encrypted in the background.)

YES, DEaR, MARIADB
INNODB_ENCRYPTION_THREADS=4
[root@encr_maria ~]# tail -f /var/lib/mysql/
encr_maria.err
...
2016-10-19 19:44:31 140629860751488 [Note] InnoDB:
Creating #1 thread id 140629124273920 total threads 4.
2016-10-19 19:44:31 140629860751488 [Note] InnoDB:
2016-10-19 19:44:31 140629860751488 [Note] InnoDB:
2016-10-19 19:44:31 140629860751488 [Note] InnoDB:
...

YES, DEaR, MARIADB
EFFECTS OF BACKGROUNDTHREADS
MariaDB [(none)]> select name from
information_schema.innodb_tablespaces_encryption where
encryption_scheme=1;
Empty set (0.00 sec)
+--------------------------+
| name |
+--------------------------+
...
| allthingsopen/t1 |
+--------------------------+
5 rows in set (0.00 sec)

YES, DEaR, MARIADB
INSERTING SENSITIVE DATA
MariaDB [allthingsopen]> create table t2 (
`intcol1` int(32) DEFAULT NULL,
`charcol1` varchar(128) DEFAULT NULL,
`charcol3` varchar(128) DEFAULT NULL
) ENGINE=InnoDB DEFAULT CHARSET=latin1;
MariaDB [allthingsopen]> insert into t2 values (3, 4,
'your', 'secret', '123-45-6789');
...
innodb-encrypt-tables
...

YES, DEaR, MARIADB
v_1x
Y2#2
7;-H
{J)Ky
'BRt
$qC5
rlDa
...

YES, DEaR, MARIADB
[root@encr_maria ~]# xxd /var/lib/mysql/encr_maria-bin.000015
...
00003e0: 7b92 71e0 1f6d b2d0 4da0 3e39 1a26 0000 {.q..m..M.>9.&..
00003f0: 00f0 6681 8eb5 e6a0 125b 9940 6c2f a37b ..f......[.@l/.{
0000400: 2108 3996 7e3d be8d 53ba 869e 54d3 9173 !.9.~=..S...T..s
0000410: ff3b c285 0000 0068 255c 6dd0 2205 a14b .;.....h%m."..K
0000420: ad8b 3b12 6ccd cd83 565c c05c fb71 4665 ..;.l…V..qFe
...
...
encrypt_binlog

YES, DEaR, MARIADB
(MYSQLBINLOG DOESN’TWORK)
[root@encr_maria ~]# mysqlbinlog /var/lib/mysql/
encr_maria-bin.000015
...
# at 249
# Encryption scheme: 1, key_version: 1, nonce:
e7f7531d547cc3ee52111b95
# The rest of the binlog is encrypted!
ERROR: Error in Log_event::read_log_event(): 'Found
invalid event in binary log', data_len: 39,
event_type: 187
DELIMITER ;
# End of log file
ROLLBACK /* added by mysqlbinlog */;
/*!50003 SET COMPLETION_TYPE=@OLD_COMPLETION_TYPE*/;
/*!50530 SET @@SESSION.PSEUDO_SLAVE_MODE=0*/;

YES, DEaR, MARIADB
NOTVISIBLE IN REDO LOG
[root@encr_maria ~]# xxd /var/lib/mysql/ib_logfile0 |
grep -v 0000
...
01b4c90: 6338 691d 9b81 aba3 134e 07e7 85e6 62c9 c8i......N....b.
01b4ca0: 4d72 e699 b357 aeb9 cbcb 5c99 6718 3b17 Mr...W.....g.;.
01b4cb0: 03d7 56e5 fbe1 1dd2 32c3 b4e8 3ab4 46bc ..V.....2...:.F.
01b4cc0: 500d 9899 4dbe b733 a505 9a03 2c34 ca7e P...M..3....,4.~
01b4cd0: d29f 2f8c 4849 0d40 eb18 531d 9531 22bd ../.HI.@..S..1”.
...
...
innodb-encrypt-log

YES, DEaR, MARIADB
REMAINING EXPOSURES
Not all data on disk is encrypted:
• slow log
• error log
• general log
• audit log
• relay logs on unencrypted slaves

YES, DEaR, MARIADB
VISIBLE IN SLOW LOG
MariaDB [allthingsopen]> set global slow_query_log=on;
MariaDB [allthingsopen]> set global long_query_time=0;
MariaDB [(none)]> update allthingsopen.t2 set
charcol3='456-78-9123' where intcol1>1;
# Time: 161019 20:55:33
# User@Host: root[root] @ localhost []
# Thread_id: 6 Schema: QC_hit: No
# Query_time: 0.003517 Lock_time: 0.000118 Rows_sent: 0
Rows_examined: 1
# Rows_affected: 0
SET timestamp=1476924933;
update allthingsopen.t2 set charcol3='456-78-9123' where
intcol1>1;
See: https://jira.mariadb.org/browse/MDEV-9639

YES, DEaR, MARIADB
VISIBLE IN ERROR LOG
MariaDB [(none)]> set global log_warnings=2;
MariaDB [(none)]> insert into allthingsopen.t2 (select * from
allthingsopen.t1 where charcol3 like '123-45-6789' limit 1);
Query OK, 0 rows affected, 1 warning (0.00 sec)
Records: 0 Duplicates: 0 Warnings: 1
[root@encr_maria ~]# less /var/lib/mysql/encr_maria.err
...
2016-10-19 20:58:53 140158235900672 [Warning] Unsafe statement
written to the binary log using statement format since
BINLOG_FORMAT = STATEMENT. The statement is unsafe because it
uses a LIMIT clause. This is unsafe because the set of rows
included cannot be predicted. Statement: insert into
allthingsopen.t2 (select * from allthingsopen.t1 where charcol3
like '123-45-6789' limit 1)

YES, DEaR, MARIADB
VISIBLE IN GENERAL LOG
MariaDB [(none)]> set global general_log=on;
MariaDB [(none)]> insert into allthingsopen.t2 values
(5, 6, 'my', 'secret', '987-65-4321');
[root@encr_maria ~]# less /var/lib/mysql/encr_maria.log
/usr/sbin/mysqld, Version: 10.1.18-MariaDB (MariaDB
Server). started with:
Tcp port: 3306 Unix socket: /var/lib/mysql/mysql.sock
Time Id Command Argument
161019 21:00:42 6 Query insert into
allthingsopen.t2 values (5, 6, 'my', 'secret',
'987-65-4321')

YES, DEaR, MARIADB
VISIBLE IN AUDIT LOG
MariaDB [(none)]> INSTALL PLUGIN server_audit SONAME
‘server_audit.so';
MariaDB [(none)]> set global server_audit_mode=1;
MariaDB [(none)]> SET GLOBAL
server_audit_events=‘CONNECT,QUERY,TABLE';
MariaDB [(none)]> SET GLOBAL server_audit_logging=ON;
MariaDB [(none)]> insert into allthingsopen.t1 values
(6, 6, 'my', 'secret', ‘777-77-7777');
[root@encr_maria ~]# tail -f /var/lib/mysql/
server_audit.log
20161019 21:12:30,encr_maria,root,localhost,
7,6,QUERY,allthingsopen,'insert into allthingsopen.t1
values (6, 6, 'my', 'secret', '777-77-7777')',0

YES, DEaR, MARIADB
VISIBLE IN RELAY LOGS
[root@encr_maria_slave ~]# xxd /var/lib/mysql/
encr_maria_slave-relay-bin.000002
...
0000300: 0008 0061 6c6c 7468 696e 6773 6f70 656e ...allthingsopen
0000310: 0069 6e73 6572 7420 696e 746f 2074 3320 .insert into t3
0000320: 7661 6c75 6573 2028 342c 2035 2c20 276d values (4, 5, 'm
0000330: 7927 2c20 2773 6563 7265 7427 2c20 2731 y', 'secret', '1
0000340: 3233 2d34 352d 3637 3839 2729 f513 0858 23-45-6789')...X
...
encrypt_binlog will encrypt both binlogs and relay logs on the
conﬁgured server, but relay logs on any attached slaves are not
encrypted without conﬁguration on those slaves. Watch those
database permissions!

YES, DEaR, MARIADB
DISABLING ENCRYPTION
MariaDB [(none)]> set global innodb_encryption_threads=0;
| test/sbtest1 |
MariaDB [allthingsopen]> alter table t2 encrypted=‘no';
MariaDB [allthingsopen]> select name from
# remove encryption configs from configurationn files
[root@centosbase ~]# sudo systemctl restart mariadb

YES, DEaR, ORACLE
EDIT MY.CNFTO INSTALL PLUGIN
[mysqld]
early-plugin-load=keyring_file.so
keyring_file_data=/var/lib/mysql/mysql-keyring/keyring
[root@encr_percona ~]# service mysql start
mysql> SELECT PLUGIN_NAME, PLUGIN_STATUS FROM
INFORMATION_SCHEMA.PLUGINS WHERE PLUGIN_NAME LIKE 'keyring%';
+--------------+---------------+
| PLUGIN_NAME | PLUGIN_STATUS |
+--------------+---------------+
| keyring_file | ACTIVE |
+--------------+---------------+
mysql> show global variables like '%keyring%';
+-------------------+--------------------------------------+
| Variable_name | Value |
+-------------------+--------------------------------------+
| keyring_file_data | /var/lib/mysql/mysql-keyring/keyring |
+-------------------+--------------------------------------+
Store your key outside the data directory.

YES, DEaR, ORACLE
CREATE KEY
[root@encr_percona ~]# cat /var/lib/mysql/mysql-
keyring/keyring
[root@encr_percona ~]#
mysql> CREATE TABLE t1 (c1 INT) ENCRYPTION=‘Y';
[root@encr_percona ~]# cat /var/lib/mysql/mysql-
keyring/keyring
Keyring file version:1.00 INNODBKey-
ad5cb6c1-962a-11e6-aaa4-0800276886e3-1AESFYY̷`WD
Create table with encryption to populate keyﬁle.

YES, DEaR, ORACLE
INSERT SENSITIVE DATA
mysql> create table t2 (
) ENGINE=InnoDB DEFAULT CHARSET=latin1
ENCRYPTION='Y';
# or if table exists
mysql> alter table t2 encryption='Y';
mysql> insert into t2 values (3, 4, 'your', 'secret',
'123-45-6789');

YES, DEaR, ORACLE
[root@encr_percona allthingsopen]# strings /var/lib/
mysql/allthingsopen/t2.ibd
A-<W
h9Ps
t#4i~
mEHPV
#)yh
d.}_H
S<.c!
"2fyN4`
zC}1;@
...

YES, DEaR, ORACLE
BINLOGS NOT ENCRYPTED
[root@encr_percona allthingsopen]# xxd /var/lib/
mysql/encr_percona-bin.000002
0000c80: 0000 0001 0002 0005 ffe0 0300 0000 0400 ................
0000c90: 0000 0479 6f75 7206 7365 6372 6574 0b31 ...your.secret.1
0000ca0: 3233 2d34 352d 3637 3839 6e4d 2aa4 5cce 23-45-6789nM*..

YES, DEaR, ORACLE
REDO LOG NOT ENCRYPTED
[root@encr_percona allthingsopen]# xxd /var/lib/
mysql/ib_logfile0 | grep -v 0000
...
0266af0: 796f 7572 7365 6372 6574 3132 332d 3435 yoursecret123-45
0266b00: 2d36 3738 3937 1c00 0017 2e2f 616c 6c74 -67897...../allt
...

YES, DEaR, ORACLE
REMAINING EXPOSURES
Only the tablespace is encrypted, leaving the following
exposed:
• binlogs
• redo log
• relay logs on unencrypted slaves
• slow log
• error log
• general log
• audit log

YES, DEaR, ORACLE
DON’T LOSETHE MASTER KEY
[root@encr_percona ~]# ls -l /var/lib/mysql/mysql-
keyring/
total 0
-rw-r-----. 1 mysql mysql 0 Oct 19 16:18 keyring
mysql> select * from t2;
ERROR 3185 (HY000): Can't find master key from
keyring, please check keyring plugin is loaded.
Special note for Xtrabackup later.

AREA OF OPPORTUNITY
OVERVIEW
ALTERNATIVES
YES, DEAR
KEY ROTATIONKEY STORAGE
THIRD-PARTYTOOLS
BACKUPS
PERFORMANCE
SUMMARY

KEY ROTATION: ORACLE
ROTATINGTHE MASTER KEY
[root@encr_percona ~]# ls -al /var/lib/mysql/mysql-
keyring/keyring
-rw-r-----. 1 mysql mysql 795 Oct 19 20:31 /var/
lib/mysql/mysql-keyring/keyring
[root@encr_percona ~]# mysql -e'alter instance
rotate innodb master key’;
[root@encr_percona ~]# ls -al /var/lib/mysql/mysql-
keyring/keyring
lib/mysql/mysql-keyring/keyring

KEY ROTATION: ORACLE
ROTATINGTHE HEADER KEY
[root@encr_percona ~]# ls -al /var/lib/mysql/
lib/mysql/allthingsopen/t2.ibd
[root@encr_percona ~]# mysql -e'alter instance
rotate innodb master key’;
[root@encr_percona ~]# ls -al /var/lib/mysql/
lib/mysql/allthingsopen/t2.ibd
Try at home: look at the header contents of the .ibd ﬁle.

KEY ROTATION: MARIADB
SOME ALTERNATIVES
Default encryption plugin: no rotation
Key rotation available with:
• Amazon Web Services (AWS) Key Management
Services (KMS) (https://mariadb.com/kb/en/mariadb/
aws-key-management-encryption-plugin/)
• eperi Gateway for Databases (http://eperi.de/mariadb)

MAINTENANCE: DECRYPT
# decrypt
MariaDB [(none)]> set global innodb_encryption_threads=0;
| test/sbtest1 |
MariaDB [allthingsopen]> alter table t2 encrypted=‘no';

MAINTENANCE: RE-ENCRYPT
[root@centosbase mysql]# mv keys.txt keys.bak
# comment out encryption configs from my.cnf
# re-encrypt; create new keys.txt and uncomment encryption
configs in my.cnf
MariaDB [(none)]> alter table allthingsopen.t2 encrypted='yes';

DON’T PUT YOUR KEY AT THE FRONT DOOR
OVERVIEW
ALTERNATIVES
YES, DEAR
KEY ROTATION
KEY STORAGETHIRD-PARTYTOOLS
BACKUPS
PERFORMANCE
SUMMARY

KEY STORAGE
CAN ENCRYPT KEYFILE
[root@maria101 mysql]# openssl enc -aes-256-cbc -md
sha1 -k mypassword -in /var/lib/mysql/keys.txt -out /
var/lib/mysql/keys.enc
[root@maria101 mysql]# cat /etc/my.cnf | grep key-
management
file-key-management-filename = /var/lib/mysql/keys.enc
file-key-management-filekey = mypassword
…but of course, the password is exposed in the my.cnf on disk

KEY STORAGE
CLEVER IDEAS
Store the keyfile on a USB stick.
Store the keyfile on a directory mounted only during
database startup.
Your clever idea!

KEY STORAGE
COMMERCIAL SOLUTIONS
AWS Key Management Service
eperi Gateway for Databases
Oracle Key Vault

WHAT TOOLS CAN STREAM DATA OR
LOGS FROM YOUR SERVER?
OVERVIEW
ALTERNATIVES
YES, DEAR
KEY ROTATION
KEY STORAGE
THIRD-PARTY TOOLS
BACKUPS
PERFORMANCE
SUMMARY

THIRD PARTYTOOLS
ONE EXAMPLE: ANEMOMETER
Note that this user doesn’t have broad permissions.

THIRD PARTYTOOLS
ANOTHER EXAMPLE: EMAIL DELIVERY
This is a common report, widely broadcast.

SOME GOOD, SOME BAD
OVERVIEW
ALTERNATIVES
YES, DEAR
KEY ROTATION
KEY STORAGE
THIRD-PARTYTOOLS
BACKUPSPERFORMANCE
SUMMARY

BACKUPS
MYSQLDUMP: MARIADB
information_schema.innodb_tablespaces_encryption
where encryption_scheme=1;
...
| allthingsopen/t2 |
...
[root@encr_maria ~]# mysqldump allthingsopen t2 >
dumpfile
[root@encr_maria ~]# cat dumpfile
...
INSERT INTO `t2` VALUES
(3,4,'your','secret','456-78-9123'),
(5,6,'my','secret','987-65-4321');

BACKUPS
MYSQLDUMP: ORACLE
mysql> show create table t2G
*************************** 1. row
***************************
Table: t2
Create Table: CREATE TABLE `t2` (
) ENGINE=InnoDB DEFAULT CHARSET=latin1 ENCRYPTION='Y'
[root@encr_percona ~]# mysqldump allthingsopen t2 > dumpfile
[root@encr_percona ~]# cat dumpfile | grep -i insert
INSERT INTO `t2` VALUES (3,4,'your','secret','123-45-6789'),
(6,7,'my','secret','123-45-6789');

BACKUPS
XTRABACKUP: MARIADB
[root@encr_maria ~]# innobackupex --user=root --
password=xxx --socket=/var/lib/mysql/mysql.sock /
backup/
xtrabackup: Generating a list of tablespaces
InnoDB: Allocated tablespace ID 4 for allthingsopen/t2,
old maximum was 0
161023 10:06:19 [01] Copying ./ibdata1 to /backup/
2016-10-23_10-06-19/ibdata1
[01] xtrabackup: Database page corruption detected at
page 1, retrying...
File ./ibdata1 seems to be corrupted.
[01] xtrabackup: Error: xtrabackup_copy_datafile()
failed.
[01] xtrabackup: Error: failed to copy datafile.
See: https://mariadb.com/kb/en/mariadb/plans-for-10x/

BACKUPS
XTRABACKUP: ORACLE
[root@encr_percona ~]# innobackupex --user=root --
password=xxx/
[root@encr_percona ~]# innobackupex --apply-log /
[root@encr_percona ~]# strings /2016-10-19_18-26-49/
ZwYS?.
1R2W
b[K-
...
[root@encr_percona ~]# cp /var/lib/mysql/mysql-
keyring/keyring /tmp/keyringbackup
[root@encr_percona ~]# innobackupex --copy-back /
2016-10-19_18-26-49/
[root@encr_percona ~]# sudo chown -R mysql: /var/
lib/mysql
[root@encr_percona ~]# cp /tmp/mysql/mysql-keyring/
keyring /var/lib/mysql/mysql-keyring/keyring
Works, but backup and restore the keyﬁle manually.

ENCRYPTION ISN’T FREE
OVERVIEW
ALTERNATIVES
YES, DEAR
KEY ROTATION
KEY STORAGE
THIRD-PARTYTOOLS
BACKUPS
PERFORMANCESUMMARY

PERFORMANCE
SETUP SYSBENCH
sysbench
--test=/usr/share/doc/sysbench/tests/db/oltp.lua
--mysql-table-engine=innodb
--oltp-test-mode=complex
--oltp-read-only=off
--oltp-table-size=100000
--max-requests=1
--num-threads=4
--max-time=10
--mysql-socket=/var/lib/mysql/mysql.sock
--mysql-user=root
--mysql-password=password
--mysql-db=test
prepare

PERFORMANCE
RUN SYSBENCH
# for num-threads 4, 8, 16, 32, 64, 128
sysbench
--test=/usr/share/doc/sysbench/tests/db/oltp.lua
--mysql-table-engine=innodb
--oltp-test-mode=complex
--oltp-read-only=off
--oltp-table-size=100000
--max-requests=100000000
--num-threads=32
--max-time=10
--mysql-socket=/var/lib/mysql/mysql.sock
--mysql-user=root
--mysql-password=password
--mysql-db=test
run >> sysbench.log

PERFORMANCE
CONVERT SYSBENCH OUTPUT
#example conversion file
[root@encr_maria_just_tablespace ~]# cat sysbench.csv
1 1772
2 2044
4 2273
8 2174
16 2256
32 2313

PERFORMANCE
MARIADB
https://www.libreofﬁce.org/

PERFORMANCE
PERCONA
Don’t compare between versions because conﬁgs can differ outside of
the isolated encryption changes within versions.

OVERVIEW
ALTERNATIVES
YES, DEAR
KEY ROTATION
KEY STORAGE
THIRD-PARTYTOOLS
BACKUPS
PERFORMANCE
SUMMARY

THE FOLLOWING OPEN SOURCE
SOFTWARE TOOLS WERE USED
MariaDB
Percona Server
Oracle MySQL Community
Sysbench
LibreOfﬁce
CentOS
Golang
Anemometer

THANK YOU
Twitter: @dataindataout
Email: valerie@opengroupware.ch

Data Encryption at Rest

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