Difference between revisions of "ClamAV"

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[[Category:Daemons and system services]]
 
 
[[Category:Security]]
 
[[Category:Security]]
{{i18n|ClamAV}}
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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]]
 
[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.
 
[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.
  
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== Starting the daemon ==
 
== Starting the daemon ==
If you want to use the daemon, you can start it with:
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The service is called {{ic|clamd.service}}. Read [[Daemons]] for more information about starting it and enabling it to start at boot.
# rc.d start clamav
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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".
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Also change the start options from "no" to "yes":
  
# change these to "yes" to start
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{{hc|/etc/conf.d/clamav|<nowiki>
START_FRESHCLAM="yes"
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# change these to "yes" to start
START_CLAMD="yes"
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START_FRESHCLAM="yes"
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START_CLAMD="yes"
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</nowiki>}}
  
 
== Updating database ==
 
== Updating database ==
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Edit the below file and comment out the line saying "Example"
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{{hc|/etc/clamav/freshclam.conf|
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# Comment or remove the line below.
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# Example
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}}
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Update the virus definitions with:
 
Update the virus definitions with:
 
  # freshclam
 
  # freshclam
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== Troubleshooting ==
 
== Troubleshooting ==
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=== Error: Clamd was NOT notified ===
 
If you get the following messages after running freshclam:
 
If you get the following messages after running freshclam:
WARNING: Clamd was NOT notified: Cannot connect to clamd through  
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{{bc|
/var/lib/clamav/clamd.sock connect(): No such file or directory
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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
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}}
  
 
Add a sock file for clamav:
 
Add a sock file for clamav:
# touch /var/lib/clamav/clamd.sock
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{{bc|
# chown clamav:clamav /var/lib/clamav/clamd.sock
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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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}}
 
Then, edit {{Ic|/etc/clamav/clamd.conf}} &ndash; uncomment this line:
 
Then, edit {{Ic|/etc/clamav/clamd.conf}} &ndash; uncomment this line:
LocalSocket /var/lib/clamav/clamd.sock
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{{bc|LocalSocket /var/lib/clamav/clamd.sock}}
Save the file and restart the daemon (rc.d stop clamav; rc.d start clamav)
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Save the file and [[Daemons|restart the daemon]]
  
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=== Error: No supported database files found ===
 
If you get the next error when starting the daemon:
 
If you get the next error when starting the daemon:
LibClamAV Error: cli_loaddb(): No supported database files found
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{{bc|
in /var/lib/clamav ERROR: Not supported data format
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LibClamAV Error: cli_loaddb(): No supported database files found
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in /var/lib/clamav ERROR: Not supported data format
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}}
 
   
 
   
 
Run freshclam as root:
 
Run freshclam as root:
# freshclam -v
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{{bc|# freshclam -v}}
  
If you get a:
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=== Error: Can't create temporary directory ===
# can't create temporary directory
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If you get the following error, along with a 'HINT' containing a UID and a GID number:
error,
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{{bc|# can't create temporary directory}}
along with a 'HINT' containing a UID and a GID number.
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Do the following:
 
Do the following:
# chown UID:GID /var/lib/clamav & chmod 755 /var/lib/clamav  
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{{bc|# chown UID:GID /var/lib/clamav & chmod 755 /var/lib/clamav}}
 
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# ex: chown 64:64
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Revision as of 17:22, 7 January 2013

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

The service is called clamd.service. Read Daemons for more information about starting it and enabling it to start at boot.

Also change the start options from "no" to "yes":

/etc/conf.d/clamav
# change these to "yes" to start
START_FRESHCLAM="yes"
START_CLAMD="yes"

Updating database

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

/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

Error: Clamd was NOT notified

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

Error: No supported database files found

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

Error: Can't create temporary directory

If you get the following error, along with a 'HINT' containing a UID and a GID number:

# can't create temporary directory

Do the following:

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