clamav/clamd-README
2020-05-28 20:51:09 -06:00

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By default, clamd provides a general "scan" service that requires minimal
configuration. To configure, edit /etc/clamd/scan.conf and:
* set LocalSocket for localhost access or TCPSocket for network access.
Default configuration will:
* Log to syslog
* Run as the user "clamscan"
When LogFile feature is wanted, it must be writable for the assigned
User. The recommended way is to:
* make it owned by the User's *group*
* assign at least 0620 (u+rw,g+w) permissions
A suitable command might be
| # touch <logfile>
| # chgrp <user> <logfile>
| # chmod 0620 <logfile>
| # restorecon <logfile>
NEVER use 'clamav' as the user since it can modify the database. This is
the user who is running the application; e.g. for mimedefang
(http://www.roaringpenguin.com/mimedefang), the user might be 'defang'.
Theoretically, distinct users could be used, but it must be made sure that
the application-user can write into the socket-file, and that the clamd-user
can access the files asked by the application to be checked.
The default service can be enabled and started with:
systemctl enable clamd@scan.service
systemctl start clamd@scan.service
To create other individual clamd-instances take the following files in
/usr/share/doc/clamd/ and modify/copy them in the suggested way:
clamd.conf, copy to /etc/clamd.d/<SERVICE>.conf
* Change <SERVICE> as to match name of config file
* Any other changes as noted above
clamd.logrotate: (only when LogFile feature is used)
* set the correct value for the logfile
* place it into /etc/logrotate.d
Additionally, when using LocalSocket instead of TCPSocket, the directory
for the socket file must be created. For tmpfiles based systems, you might
want to create a file /etc/tmpfiles.d/clamd.<SERVICE>.conf with a content of
| d /run/clamd.<SERVICE> <MODE> <USER> <GROUP>
Adjust <MODE> (0710 should suffice for most cases) and <USER> + <GROUP>
so that the socket can be accessed by clamd and by the applications using
clamd. Make sure that the socket is not world accessible; else, DOS attacks
or worse are trivial.
After emulating these steps by hand (or else rebooting), you still need set
SELinux:
chcon -t clamd_var_run_t /run/clamd.<SERVICE>
or
restorecon -R -v "/run/clamd.<SERVICE>"
More SELinux notes:
you may need run:
setsebool -P antivirus_can_scan_system 1
and also maybe this one (I need to confirm that is obsolete)
setsebool -P antivirus_use_jit 1
The new service can be enabled and started with:
systemctl enable clamd@<SERVICE>.service
systemctl start clamd@<SERVICE>.service
[Disclaimer:
this file and the script/configfiles are not part of the official
clamav package.
Please send complaints and comments to
https://bugzilla.redhat.com/enter_bug.cgi?product=Fedora&component=clamav]