Audit Log Plugin

Audit Log Plugin

Percona Audit Log Plugin provides monitoring and logging of connection and query activity that were performed on specific server. Information about the activity will be stored in the XML log file where each event will have its NAME field, it’s own unique RECORD_ID field and a TIMESTAMP field. This implementation is alternative to the MySQL Enterprise Audit Log Plugin

Audit Log plugin produces the log of following events:

  • Audit - Audit event indicates that audit logging started or finished. NAME field will be Audit when logging started and NoAudit when logging finished. Audit record also includes server version and command-line arguments.

Example of the Audit event:

<AUDIT_RECORD
 "NAME"="Audit"
 "RECORD"="1_2014-04-29T09:29:40"
 "TIMESTAMP"="2014-04-29T09:29:40 UTC"
 "MYSQL_VERSION"="5.5.37-35.0-655.trusty"
 "STARTUP_OPTIONS"="--basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --user=mysql --log-error=/var/log/mysql/error.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306"
 "OS_VERSION"="x86_64-debian-linux-gnu",
 />
  • Connect/Disconnect - Connect record event will have NAME field Connect when user logged in or login failed, or Quit when connection is closed. Additional fields for this event are CONNECTION_ID, STATUS, USER, PRIV_USER, OS_LOGIN, PROXY_USER, HOST, and IP. STATUS will be 0 for successful logins and non-zero for failed logins.

Example of the Disconnect event:

<AUDIT_RECORD
 "NAME"="Quit"
 "RECORD"="24_2014-04-29T09:29:40"
 "TIMESTAMP"="2014-04-29T10:20:13 UTC"
 "CONNECTION_ID"="49"
 "STATUS"="0"
 "USER"=""
 "PRIV_USER"=""
 "OS_LOGIN"=""
 "PROXY_USER"=""
 "HOST"=""
 "IP"=""
 "DB"=""
 />
  • Query - Additional fields for this event are: COMMAND_CLASS (values come from the com_status_vars array in the sql/mysqld.cc` file in a MySQL source distribution. Examples are select, alter_table, create_table, etc.), CONNECTION_ID, STATUS (indicates error when non-zero), SQLTEXT (text of SQL-statement), USER, HOST, OS_USER, IP. Possible values for the NAME name field for this event are Query, Prepare, Execute, Change user, etc.

Example of the Query event:

<AUDIT_RECORD
 "NAME"="Query"
 "RECORD"="23_2014-04-29T09:29:40"
 "TIMESTAMP"="2014-04-29T10:20:10 UTC"
 "COMMAND_CLASS"="select"
 "CONNECTION_ID"="49"
 "STATUS"="0"
 "SQLTEXT"="SELECT * from mysql.user"
 "USER"="root[root] @ localhost []"
 "HOST"="localhost"
 "OS_USER"=""
 "IP"=""
 />

Installation

Audit Log plugin is shipped with Percona Server, but it is not installed by default. To enable the plugin you must run the following command:

INSTALL PLUGIN audit_log SONAME 'audit_log.so';

You can check if the plugin is loaded correctly by running:

SHOW PLUGINS;

Audit log should be listed in the output:

+--------------------------------+----------+--------------------+--------------+---------+
| Name                           | Status   | Type               | Library      | License |
+--------------------------------+----------+--------------------+--------------+---------+
...
| audit_log                      | ACTIVE   | AUDIT              | audit_log.so | GPL     |
+--------------------------------+----------+--------------------+--------------+---------+

Log Format

The audit log plugin supports four log formats: OLD, NEW, JSON, and CSV. OLD and NEW formats are based on XML, where the former outputs log record properties as XML attributes and the latter as XML tags. Information logged is the same in all four formats. The log format choice is controlled by audit_log_format variable.

Example of the OLD format:

<AUDIT_RECORD
 "NAME"="Query"
 "RECORD"="2_2014-04-28T09:29:40"
 "TIMESTAMP"="2014-04-28T09:29:40 UTC"
 "COMMAND_CLASS"="install_plugin"
 "CONNECTION_ID"="47"
 "STATUS"="0"
 "SQLTEXT"="INSTALL PLUGIN audit_log SONAME 'audit_log.so'"
 "USER"="root[root] @ localhost []"
 "HOST"="localhost"
 "OS_USER"=""
 "IP"=""
/>

Example of the NEW format:

<AUDIT_RECORD>
 <NAME>Quit</NAME>
 <RECORD>10902_2014-04-28T11:02:54</RECORD>
 <TIMESTAMP>2014-04-28T11:02:59 UTC</TIMESTAMP>
 <CONNECTION_ID>36</CONNECTION_ID>
 <STATUS>0</STATUS>
 <USER></USER>
 <PRIV_USER></PRIV_USER>
 <OS_LOGIN></OS_LOGIN>
 <PROXY_USER></PROXY_USER>
 <HOST></HOST>
 <IP></IP>
 <DB></DB>
</AUDIT_RECORD>

Example of the JSON format:

{"audit_record":{"name":"Query","record":"4707_2014-08-27T10:43:52","timestamp":"2014-08-27T10:44:19 UTC","command_class":"show_databases","connection_id":"37","status":0,"sqltext":"show databases","user":"root[root] @ localhost []","host":"localhost","os_user":"","ip":""}}

Example of the CSV format:

"Query","49284_2014-08-27T10:47:11","2014-08-27T10:47:23 UTC","show_databases","37",0,"show databases","root[root] @ localhost []","localhost","",""

Streaming the audit log to syslog

Ability to stream the audit log to syslog was implemented in Percona Server 5.5.39-36.0. To stream the audit log to syslog you’ll need to set audit_log_handler variable to SYSLOG. To control the syslog file handler, the following variables can be used: audit_log_syslog_ident, audit_log_syslog_facility, and audit_log_syslog_priority These variables have the same meaning as appropriate parameters described in the syslog(3) manual.

Note

Variables: audit_log_strategy, audit_log_buffer_size, audit_log_rotate_on_size, audit_log_rotations have effect only with FILE handler.

System Variables

variable audit_log_strategy
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

String
Default Value:

ASYNCHRONOUS
Allowed values:

ASYNCHRONOUS, PERFORMANCE, SEMISYNCHRONOUS, SYNCHRONOUS

This variable is used to specify the audit log strategy, possible values are:

  • ASYNCHRONOUS - (default) log using memory buffer, do not drop messages if buffer is full
  • PERFORMANCE - log using memory buffer, drop messages if buffer is full
  • SEMISYNCHRONOUS - log directly to file, do not flush and sync every event
  • SYNCHRONOUS - log directly to file, flush and sync every event

This variable has effect only when audit_log_handler is set to FILE.

variable audit_log_file
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

String
Default Value:

audit.log

This variable is used to specify the filename that’s going to store the audit log. It can contain the path relative to the datadir or absolute path.

variable audit_log_flush
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

Yes
Variable Type:

String
Default Value:

OFF

When this variable is set to ON log file will be closed and reopened. This can be used for manual log rotation.

variable audit_log_buffer_size
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

Numeric
Default Value:

4096

This variable can be used to specify the size of memory buffer used for logging, used when audit_log_strategy variable is set to ASYNCHRONOUS or PERFORMANCE values. This variable has effect only when audit_log_handler is set to FILE.

variable audit_log_format
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

String
Default Value:

OLD
Allowed values:

OLD, NEW, CSV, JSON

This variable is used to specify the audit log format. The audit log plugin supports four log formats: OLD, NEW, JSON, and CSV. OLD and NEW formats are based on XML, where the former outputs log record properties as XML attributes and the latter as XML tags. Information logged is the same in all four formats.

variable audit_log_policy
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

Yes
Variable Type:

String
Default Value:

ALL
Allowed values:

ALL, LOGINS, QUERIES, NONE

This variable is used to specify which events should be logged. Possible values are:

  • ALL - all events will be logged
  • LOGINS - only logins will be logged
  • QUERIES - only queries will be logged
  • NONE - no events will be logged
variable audit_log_rotate_on_size
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

Numeric
Default Value:

0 (don’t rotate the log file)

This variable is used to specify the maximum audit log file size. Upon reaching this size the log will be rotated. The rotated log files will be present in the same same directory as the current log file. A sequence number will be appended to the log file name upon rotation. This variable has effect only when audit_log_handler is set to FILE.

variable audit_log_rotations
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

Numeric
Default Value:

0

This variable is used to specify how many log files should be kept when audit_log_rotate_on_size variable is set to non-zero value. This variable has effect only when audit_log_handler is set to FILE.

variable audit_log_handler
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

String
Default Value:

FILE
Allowed values:

FILE, SYSLOG

This variable is used to configure where the audit log will be written. If it is set to FILE, the log will be written into a file specified by audit_log_file variable. If it is set to SYSLOG, the audit log will be written to syslog.

variable audit_log_syslog_ident
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

String
Default Value:

percona-audit

This variable is used to specify the ident value for syslog. This variable has the same meaning as the appropriate parameter described in the syslog(3) manual.

variable audit_log_syslog_facility
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

String
Default Value:

LOG_USER

This variable is used to specify the facility value for syslog. This variable has the same meaning as the appropriate parameter described in the syslog(3) manual.

variable audit_log_syslog_priority
Version Info:
Command Line:

Yes
Scope:

Global
Dynamic:

No
Variable Type:

String
Default Value:

LOG_INFO

This variable is used to specify the priority value for syslog. This variable has the same meaning as the appropriate parameter described in the syslog(3) manual.

Version Specific Information

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