Ansible Role clamav

This role installs and configures ClamAV, „an open-source antivirus engine for detecting trojans, viruses, malware & other malicious threats.“ It also configures freshclam to regularly update the official ClamAV signatures (12 times a day). This role exposes options for enabling on-access scanning and / or periodic full-scans and configures mail notifications for found viruses.

Runs on

RHEL 8 (and compatible)

When using on-access scanning, one might need to increase the inotify/max_user_watches. Have a look at the official documentation. This can be done using the linuxfabrik.lfops.kernel_settings role. ClamAV can be tested using the EICAR test virus:

wget http://www.eicar.org/download/eicar.com
wget http://www.eicar.org/download/eicar.com.txt
wget http://www.eicar.org/download/eicar_com.zip
wget http://www.eicar.org/download/eicarcom2.zip

Optional Requirements

Enable the antivirus_can_scan_system and antivirus_use_jit SELinux Booleans. This can be done using the linuxfabrik.lfops.selinux role.
Fangfrisch to download unofficial signatures. This can be done using the linuxfabrik.lfops.fangfrisch role.

If you use the ClamAV Playbook, this is automatically done for you.

Tags

Tag	What it does
`clamav`	Installs and configures ClamAV
`clamav:state`	Manages the states of various ClamAV services and timers
`clamav:configure`	Manages the various ClamAV config files

Optional Role Variables

Variable	Description	Default Value
`clamav__clamd_service_enabled`	Enables or disables the clamd background service, analogous to `systemctl enable/disable`. The clamd service is required for on-access scanning and full-scans.	`true`
`clamav__clamdscan_on_calendar`	When the full-scan should be run. Have a look at systemd.time(7) for the format.	`‘--* 21:{{ 59
`clamav__clamdscan_paths`	Which paths should be scanned during the full-scan.	`'{{ clamav__scan_on_access_include_paths }}'`
`clamav__clamdscan_timer_enabled`	Enables or disables the clamdscan timer for the periodic full-scan, analogous to `systemctl enable/disable`.	`false`
`clamav__clamonacc_service_enabled`	Enables or disables the on-access scanning service, analogous to `systemctl enable/disable`.	`false`
`clamav__freshclam_private_mirror`	„This option allows you to easily point freshclam to private mirrors“ (see `man freshclam.conf`).	`[]`
`clamav__freshclam_service_enabled`	Enables or disables the freshclam service, analogous to `systemctl enable/disable`. Freshclam is responsible for updating the official ClamAV signatures.	`true`
`clamav__mail_from`	Username with access to the mail server. Required to send mail notifications for found viruses.	`'{{ mailto_root__from }}'`
`clamav__mail_recipients`	List recipient addresses to which the mail notifications should be sent.	`'{{ mailto_root__to }}'`
`clamav__mail_subject_prefix`	This will set a prefix that will be showed in front of the hostname. Can be used to separate servers by environment or customer.	`''`
`clamav__scan_alert_broken_executables`	„With this option clamav will try to detect broken executables (both PE and ELF) and alert on them with the Broken.Executable heuristic signature.“	`true`
`clamav__scan_detect_pua`	On-access & full-scans: „Detect Possibly Unwanted Applications.“	`true`
`clamav__scan_max_directory_recursion`	„Maximum depth directories are scanned at.“	`20`
`clamav__scan_max_file_size`	Full-scan: „Files larger than this limit won’t be scanned.“	`'450M'`
`clamav__scan_max_recursion`	Specifies how deeply nested archives should be scanned recursively.	`30`
`clamav__scan_max_scan_size`	„Sets the maximum amount of data to be scanned for each input file.“	`'450M'`
`clamav__scan_on_access_exclude_paths`	On-access: „Set the exclude paths. All subdirectories are also excluded.“	`[]`
`clamav__scan_on_access_include_paths`	On-access: „Set the include paths (all files inside them will be scanned).“	`[]`
`clamav__scan_on_access_max_file_size`	On-access: „Don’t scan files larger than this.“	`'500M'`
`clamav__scan_on_access_prevention`	On-access: Prevents access to the file if a virus is found. Note that this also blocks the full-scan from accessing the files.	`false`
`clamav__whitelist_files`	Whitelist specific files. Use `sigtool --md5 my-false-positive-file` to generate the entry. Have a look at the official documentation for details.	`[]`
`clamav__whitelist_signatures`	Whitelist specific signatures. Note that it is possible that one needs to whitelist multiple signatures for the same finding, as it can come from different databases with different names. Have a look at the example below and the official documentation for details.	`[]`

Example:

# optional
clamav__clamd_service_enabled: true
clamav__clamdscan_on_calendar: '*-*-* 21:{{ 59 | random(seed=inventory_hostname) }}'
clamav__clamdscan_paths: '{{ clamav__scan_on_access_include_paths }}'
clamav__clamdscan_timer_enabled: false
clamav__clamonacc_service_enabled: false
clamav__freshclam_private_mirror: []
clamav__freshclam_service_enabled: true
clamav__mail_from: '{{ mailto_root__from }}'
clamav__mail_recipients: '{{ mailto_root__to }}'
clamav__mail_subject_prefix: '000-my-customer-'
clamav__scan_alert_broken_executables: true
clamav__scan_detect_pua: true
clamav__scan_max_directory_recursion: 20
clamav__scan_max_file_size: '450M'
clamav__scan_max_recursion: 30
clamav__scan_max_scan_size: '450M'
clamav__scan_on_access_exclude_paths:
  - '/root/private-files'
clamav__scan_on_access_include_paths:
  - '/root'
clamav__scan_on_access_max_file_size: '500M'
clamav__scan_on_access_prevention: false
clamav__whitelist_files:
  - '44d88612fea8a8f36de82e1278abb02f:68:eicar.com'
clamav__whitelist_signatures:
  - 'Eicar-Signature'
  - 'Eicar-Test-Signature'
  - 'Win.Test.EICAR_HDB-1'
  - 'Win.Test.EICAR_HSB-1'

License

The Unlicense

Author Information

Linuxfabrik GmbH, Zurich