Difference between revisions of "ClamAV"

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[[Category:Security]]
 
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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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To start the daemon:
  # rc.d start clamav
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  # systemctl start clamd
  
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".
+
To start it automatically at boot:
 +
# systemctl enable clamd
 +
 
 +
Also in {{ic|/etc/conf.d/clamav}} change the start options from "no" to "yes".
  
 
  # change these to "yes" to start
 
  # change these to "yes" to start
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== Updating database ==
 
== Updating database ==
 +
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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Update the virus definitions with:
 
Update the virus definitions with:
 
  # freshclam
 
  # freshclam
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Then, edit {{Ic|/etc/clamav/clamd.conf}} – uncomment this line:
 
Then, edit {{Ic|/etc/clamav/clamd.conf}} – uncomment this line:
 
  LocalSocket /var/lib/clamav/clamd.sock
 
  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 restart the daemon {{ic|systemctl restart clamd}}
  
 
If you get the next error when starting the daemon:
 
If you get the next error when starting the daemon:

Revision as of 02:26, 25 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

To start the daemon:

# systemctl start clamd

To start it automatically at boot:

# systemctl enable clamd

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"

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

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 systemctl restart clamd

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