Difference between revisions of "ClamAV"

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[[Category:Networking (English)]]
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[[Category:Daemons and system services]]
[[Category:HOWTOs (English)]]
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[[Category:Security]]
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[[es:ClamAV]]
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[[it:ClamAV]]
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[[ru:ClamAV]]
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[[sr:ClamAV]]
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[[zh-CN:ClamAV]]
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[http://www.clamav.net Clam AntiVirus] is an open source (GPL) anti-virus toolkit for UNIX.  It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates.  Because ClamAV's main use is on file/mail servers for Windows desktops it primarily detects Windows viruses and malware.
  
{{i18n_links_start}}
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== Installation ==
{{i18n_entry|English|Install and configure Antivirus ClamAV}}
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ClamAV can be [[pacman|installed]] with package {{Pkg|clamav}}, available in the [[Official Repositories]].
{{i18n_entry|Español|Cómo instalar y configurar ClamAV Antivirus}}
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{{i18n_links_end}}
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==== ClamAV installation====
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== Configuration ==
* Grab it<br><pre>pacman -Sy clamav</pre>
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Whether you are going to use clamav as a daemon or use it as a simple file checker you need to comment out the line that contains the word ''Example'', usually it is found at the beginning of {{ic|/etc/clamav/freshclam.conf}} and {{ic|/etc/clamav/clamd.conf}} files.
  
* Configure it
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== Starting the daemon ==
*# Edit /etc/clamav/clamd.conf, /etc/clamav/freshclam.conf and comment out the ''Example'' flag
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If you want to use the daemon, you can start it with:
*# Edit /etc/conf.d/clamav and change the start options from "no" to "yes"<br>
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# rc.d start clamav
<pre># change these to "yes" to start
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START_FRESHCLAM="yes"
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START_CLAMD="yes"</pre>
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* Edit /etc/rc.conf and write clamav into the list of daemons, if you like to start clamav automaticaly when booting.<br><br>
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To start it automatically at boot add '''clamav''' to the {{Ic|DAEMONS}} array in {{ic|/etc/rc.conf}}. Also in {{ic|/etc/conf.d/clamav}} change the start options from "no" to "yes".
  
==== ClamAV errors & solutions ====
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# change these to "yes" to start
* If you get the following messages after running freshclam:
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START_FRESHCLAM="yes"
<pre>
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START_CLAMD="yes"
WARNING: Clamd was NOT notified: Can't connect to clamd through /var/lib/clamav/clamd.sock
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connect(): No such file or directory
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</pre>
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==> Run the following commands as root:<br>
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<pre>
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# touch /var/lib/clamav/clamd.sock
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# chown clamav:clamav /var/lib/clamav/clamd.sock
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</pre>
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 +
If you want to use the daemon in a systemd environment:
 +
# systemctl enable clamd
  
* If you get the next error when starting /etc/rc.d/clamav:
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== Updating database ==
<pre>
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Edit the below file and comment out the line saying "Example"
LibClamAV Error: cli_loaddb(): No supported database files found in /var/lib/clamav
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# vim /etc/clamav/freshclam.conf
ERROR: Not supported data format
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  # Comment or remove the line below.
</pre>
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  #Example
==> Just try to run freshclam as root:
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  freshclam -v
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Update the virus definitions with:
 +
# freshclam
 +
 
 +
The database files are saved in:
 +
/var/lib/clamav/daily.cvd
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/var/lib/clamav/main.cvd
 +
 
 +
== Scan for Viruses ==
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{{ic|clamscan}} can be used to scan certain files, home directory, or an entire system:
 +
 
 +
$ clamscan myfile
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$ clamscan -r -i /home
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$ clamscan -r -i --exclude-dir=^/sys\|^/proc\|^/dev /
 +
 
 +
If you would like {{ic|clamscan}} to remove the infected file use the {{ic|--remove}} option in the command.
 +
 
 +
== Troubleshooting ==
 +
If you get the following messages after running freshclam:
 +
WARNING: Clamd was NOT notified: Cannot connect to clamd through
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/var/lib/clamav/clamd.sock connect(): No such file or directory
 +
 
 +
Add a sock file for clamav:
 +
# touch /var/lib/clamav/clamd.sock
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# chown clamav:clamav /var/lib/clamav/clamd.sock
 +
Then, edit {{Ic|/etc/clamav/clamd.conf}} &ndash; uncomment this line:
 +
LocalSocket /var/lib/clamav/clamd.sock
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Save the file and restart the daemon (rc.d stop clamav; rc.d start clamav)
 +
 
 +
If you get the next error when starting the daemon:
 +
LibClamAV Error: cli_loaddb(): No supported database files found
 +
in /var/lib/clamav ERROR: Not supported data format
 +
 +
Run freshclam as root:
 +
  # freshclam -v
 +
 
 +
If you get a:
 +
# can't create temporary directory
 +
error,
 +
along with a 'HINT' containing a UID and a GID number.
 +
 
 +
Do the following:
 +
# chown UID:GID /var/lib/clamav & chmod 755 /var/lib/clamav
 +
 
 +
# ex: chown 64:64

Revision as of 01:52, 19 November 2012

Clam AntiVirus is an open source (GPL) anti-virus toolkit for UNIX. It provides a number of utilities including a flexible and scalable multi-threaded daemon, a command line scanner and advanced tool for automatic database updates. Because ClamAV's main use is on file/mail servers for Windows desktops it primarily detects Windows viruses and malware.

Installation

ClamAV can be installed with package clamav, available in the Official Repositories.

Configuration

Whether you are going to use clamav as a daemon or use it as a simple file checker you need to comment out the line that contains the word Example, usually it is found at the beginning of /etc/clamav/freshclam.conf and /etc/clamav/clamd.conf files.

Starting the daemon

If you want to use the daemon, you can start it with:

# rc.d start clamav

To start it automatically at boot add clamav to the DAEMONS array in /etc/rc.conf. Also in /etc/conf.d/clamav change the start options from "no" to "yes".

# change these to "yes" to start
START_FRESHCLAM="yes"
START_CLAMD="yes"

If you want to use the daemon in a systemd environment:

# systemctl enable clamd

Updating database

Edit the below file and comment out the line saying "Example"

# vim /etc/clamav/freshclam.conf
  # Comment or remove the line below.
  #Example

Update the virus definitions with:

# freshclam

The database files are saved in:

/var/lib/clamav/daily.cvd
/var/lib/clamav/main.cvd

Scan for Viruses

clamscan can be used to scan certain files, home directory, or an entire system:

$ clamscan myfile
$ clamscan -r -i /home
$ clamscan -r -i --exclude-dir=^/sys\|^/proc\|^/dev /

If you would like clamscan to remove the infected file use the --remove option in the command.

Troubleshooting

If you get the following messages after running freshclam:

WARNING: Clamd was NOT notified: Cannot connect to clamd through 
/var/lib/clamav/clamd.sock connect(): No such file or directory

Add a sock file for clamav:

# touch /var/lib/clamav/clamd.sock
# chown clamav:clamav /var/lib/clamav/clamd.sock

Then, edit /etc/clamav/clamd.conf – uncomment this line:

LocalSocket /var/lib/clamav/clamd.sock

Save the file and restart the daemon (rc.d stop clamav; rc.d start clamav)

If you get the next error when starting the daemon:

LibClamAV Error: cli_loaddb(): No supported database files found
in /var/lib/clamav ERROR: Not supported data format

Run freshclam as root:

# freshclam -v

If you get a:

# can't create temporary directory

error, along with a 'HINT' containing a UID and a GID number.

Do the following:

# chown UID:GID /var/lib/clamav & chmod 755 /var/lib/clamav 
# ex: chown 64:64