Internal configuration

The main configuration is located in the ossec.conf file, however some internal configuration features are located in the /var/ossec/etc/internal_options.conf file.

Generally, this file is reserved for debugging issues and for troubleshooting. Any error in this file may cause your installation to malfunction or fail to run.

Warning

This file will be overwritten during upgrades. In order to maintain custom changes, you must use the /var/ossec/etc/local_internal_options.conf file.

Agent

agent.tolerance

Description

Time in seconds since the agent is full until trigger a flooding alert.

Default value

15

Allowed value

Any integer between 0 and 600.

agent.warn_level

Description

Percentage of occupied capacity in Agent buffer to trigger a warning alert.

Default value

90

Allowed value

Any integer between 1 and 100.

agent.normal_level

Description

Percentage of occupied capacity in Agent buffer to come back to normal state.

Default value

70

Allowed value

Any integer between 0 and agent.warn_level - 1.

agent.min_eps

Description

Minimum events per second permited in <client_buffer> configuration.

Default value

50

Allowed value

Any integer between 1 and 1000.

agent.debug

Description

Run the unix agent’s processes in debug mode.

Default value

0

Allowed value

0 : No debug output

1: Standard debug output

2: Verbose debug outputNext,Previous

Analysisd

analysisd.default_timeframe

Description

Analysisd default rule timeframe.

Default value

360

Allowed value

Any integer between 60 and 360

analysisd.stats_maxdiff

Description

Analysisd stats maximum diff.

Default value

999000

Allowed value

Any integer between 10 and 99999

analysisd.stats_mindiff

Description

Analysisd stats minimum diff.

Default value

1250

Allowed value

Any integer between 10 and 999999

analysisd.stats_percent_diff

Description

Analysisd stats percentage (how much to differ from average).

Default value

150

Allowed value

Any integer between 5 and 9999

analysisd.fts_list_size

Description

Analysisd FTS list size.

Default value

32

Allowed value

Any integer between 12 and 512

analysisd.fts_min_size_for_str

Description

Analysisd FTS minimum string size.

Default value

14

Allowed value

Any integer between 6 and 128

analysisd.log_fw

Description

Analysisd Enable the firewall log (at logs/firewall/firewall.log).

Default value

1

Allowed value

0, 1

analysisd.decoder_order_size

Description

Maximum number of fields in a decoder (order tag).

Default value

64

Allowed value

Any integer between 10 and 64

analysisd.geoip_jsonout

Description

Output GeoIP data at JSON alerts.

Default value

0

Allowed value

0, 1

analysisd.label_cache_maxage

Description

Time in seconds without reload labels in cache from agents.

Default value

0

Allowed value

Any integer between 0 and 60.

analysisd.show_hidden_labels

Description

Make hidden labels visible in alerts.

Default value

0

Allowed value

0, 1

analysisd.debug

Description

Debug level (manager installations)

Default value

0

Allowed value

0: No debug output

1: Standard debug output

2: Verbose debug output

DBD

dbd.reconnect_attempts

Description

The number of times ossec-dbd will attempt to reconnect to the database.

Default value

10

Allowed value

Any integer between 1 and 9999

Logcollector

logcollector.loop_timeout

Description

File polling interval.

Default value

2

Allowed value

Any integer between 1 and 120

logcollector.open_attempts

Description

Number of attempts to open a log file.

Default value

8

Allowed value

Any integer between 2 and 298

logcollector.remote_commands

Description

Enable/disable Logcollector to accept remote commands from the manager.

Default value

0

Allowed value

0, 1

logcollector.vcheck_files

Description

Number of readings before checking files.

Default value

64

Allowed value

Any integer between 0 and 1024

logcollector.max_lines

Description

Maximum number of logs read from the same file in each iteration.

Default value

10000

Allowed value

Any integer between 100 and 100000.

logcollector.debug

Description

Debug level (used in manager or unix agent installations)

Default value

0

Allowed value

0: No debug output

1: Standard debug output

2: Verbose debug output

Maild

maild.strict_checking

Description

Toggle to enable or disable strict checking.

Default value

1

Allowed value

0, 1

maild.grouping

Description

Toggle to enable or disable grouping of alerts into a single email.

Default value

1

Allowed value

0, 1

maild.full_subject

Description

Toggle to enable or disable full subject in alert emails.

Default value

0

Allowed value

0, 1

maild.geoip

Description

Toggle to enable or disable GeoIP data in alert emails.

Default value

1

Allowed value

0, 1

Monitord

monitord.day_wait

Description

Amount of seconds to wait before compressing or signing the files.

Default value

10

Allowed value

Any integer between 5 and 240

monitord.compress

Description

Toggle to enable or disable log file compression.

Default value

1

Allowed value

0, 1

monitord.sign

Description

Toggle to enable or disable signing the log files.

Default value

1

Allowed value

0, 1

monitord.monitor_agents

Description

Toggle to enable or disable monitoring of agents.

Default value

1

Allowed value

0, 1

monitord.keep_log_days

Description

Number of days to keep rotated internal logs.

Default value

31

Allowed value

0, 500

Remoted

remoted.recv_counter_flush

Description

Flush rate for the receive counter.

Default value

128

Allowed value

Any integer between 10 and 999999

remoted.comp_average_printout

Description

Compression averages printout.

Default value

19999

Allowed value

Any integer between 10 and 999999

remoted.verify_msg_id

Description

Toggle to enable or disable verification of msg id.

Default value

0

Allowed value

0, 1

remoted.pass_empty_keyfile

Description

Toggle to enable or disable acceptance of empty client.keys.

Default value

1

Allowed value

0, 1

remoted.debug

Description

Debug level (manager installation)

Default value

0

Allowed value

0: No debug output

1: Standard debug output

2: Verbose debug output

Syscheck

syscheck.sleep

Description

Number of seconds to sleep after reading syscheck.sleep_after number of files.

Default value

2

Allowed value

Any integer between 0 and 64

syscheck.sleep_after

Description

Number of files to read before sleeping for syscheck.sleep seconds.

Default value

15

Allowed value

Any integer between 1 and 9999

syscheck.debug

Description

Debug level (used in manager and unix agent installations).

Default value

0

Allowed value

0: No debug output

1: Standard debug output

2: Verbose debug outputNext,Previous

Rootcheck

rootcheck.sleep

Description

Number of milliseconds to sleep after reading one PID or suspicious port.

New in version 2.1.

Default value

50

Allowed values

Any integer from 0 to 50.

Wazuh_database

The Wazuh core uses list-based databases to store information related to agent keys and FIM / Rootcheck event data. Such information is highly optimized to be handled by the core.

In order to provide well-structured data that could be accessed by the user or the Wazuh API, new SQLite-based databases have been introduced in the Wazuh manager. The Database Synchronization Module is a user-transparent component that collects the following information from the core:

  • Agent’s name, address, encryption key, last connection time, operating system, agent version and shared configuration hash.

  • FIM data: creation, modification and deletion of regular files and Windows registry entries.

  • Rootcheck detected defects: issue message, first detection date and last alert time.

  • Static core settings, such as maximum permitted agents or SSL being enabled for Authd.

Note

The Wazuh Database Synchronization Module starts automatically on the server and local profiles and requires no configuration, however, some optional settings are available.

The module uses inotify from Linux to monitor changes to every log file in real-time. Databases will be updated as soon as possible when a change is detected. If inotify is not supported, (for example, on operating systems other than Linux) every log file will be scanned continuously, looking for changes, with a default delay of one minute between scans.

How to disable the module

To disable the Wazuh Database Synchronization Module, the sync directives must be set to 0 in the etc/local_internal_options.conf file as shown below:

wazuh_database.sync_agents=0
wazuh_database.sync_syscheck=0
wazuh_database.sync_rootcheck=0

Once these settings have been adjusted, save the file and restart Wazuh. With the above settings, the Database Synchronization Module will not be loaded when Wazuh starts.

wazuh_database.sync_agents

Description

Synchronize agent database with client.keys.

Default value

1

Allowed value

0, 1

wazuh_database.sync_syscheck

Description

Synchronize f.i.m. data with Syscheck database.

Default value

1

Allowed value

0, 1

wazuh_database.sync_rootcheck

Description

Synchronize policy monitoring data with Rootcheck database.

Default value

1

Allowed value

0, 1

wazuh_database.full_sync

Description

Full data synchronization.

Default value

0

Allowed value

0, 1

wazuh_database.sleep

Description

Interval to sleep between cycles. Only necessary if inotify not available.

Default value

60

Allowed value

Any integer between 0 and 86400 (seconds)

wazuh_database.max_queued_events

Description

Max number of queued events (only if inotify is available).

Default value

0 (use system default value)

Allowed value

Any integer between 0 and 2147483647

Wazuh_modules

wazuh_modules.task_nice

Description

Indicates the priority of the tasks. Lower Value, Higher priority.

Default value

10

Allowed value

Any integer between -20 and 19

wazuh_modules.max_eps

Description

Maximum number of events per second sent by OpenSCAP Wazuh Module.

Default value

1000

Allowed value

Any integer between 100 and 1000

wazuh_modules.debug

Description

Debug level

Default value

0

Allowed value

0: No debug output

1: Standard debug output

2: Verbose debug outputNext,Previous

Windows

windows.debug

Description

Debug level (used in windows agent installations).

Default value

0

Allowed value

0: No debug output

1: Standard debug output

2: Verbose debug outputNext,Previous