Postfix + Clamav + Amavisd2018/05/10

	Configure Virus-Scanning with Postfix + Clamav.
[1]	Install Clamav, refer to here.
[2]	Install Amavisd and Clamav Server, and start Clamav Server first.

[root@mail ~]#

dnf -y install amavisd-new clamd

[root@mail ~]#

vi /etc/clamd.d/scan.conf

# line 8: comment out

Example

# line 14: uncomment

LogFile /var/log/clamd.scan

# line 66: uncomment

PidFile /var/run/clamd.scan/clamd.pid

# line 70: uncomment

TemporaryDirectory /var/tmp

# line 85: uncomment

LocalSocket /var/run/clamd.scan/clamd.sock

# line 101: uncomment

TCPSocket 3310

[root@mail ~]#

touch /var/log/clamd.scan

[root@mail ~]#

chown clamscan. /var/log/clamd.scan

[root@mail ~]#

systemctl start clamd@scan

[root@mail ~]#

systemctl enable clamd@scan

[3]	If SELinux is enabled, add rules like follows.

[root@mail ~]#

restorecon -v /var/log/clamd.scan

[root@mail ~]#

setsebool -P antivirus_can_scan_system on

[root@mail ~]#

vi my-spamd.te

# create new

module my-spamd 1.0;

require {
        type spamd_t;
        class capability dac_override;
}

#============= spamd_t ==============
allow spamd_t self:capability dac_override;

[root@mail ~]#

checkmodule -m -M -o my-spamd.mod my-spamd.te

checkmodule: loading policy configuration from my-spamd.te
checkmodule: policy configuration loaded
checkmodule: writing binary representation (version 19) to my-spamd.mod
[root@mail ~]#

semodule_package --outfile my-spamd.pp --module my-spamd.mod

[root@mail ~]#

semodule -i my-spamd.pp

[4]	Configure Amavisd.

[root@mail ~]#

vi /etc/amavisd/amavisd.conf

# line 20: change to the own domain name

$mydomain = '

srv.world

# line 152: change to the own hostname

$myhostname = '

mail.srv.world

# line 154: uncomment

$notify_method = 'smtp:[127.0.0.1]:10025';
$forward_method = 'smtp:[127.0.0.1]:10025';

# line 384: change

\&ask_daemon, ["CONTSCAN {}\n", "

/var/run/clamd.scan/clamd.sock

"],

[root@mail ~]#

systemctl start amavisd spamassassin

[root@mail ~]#

systemctl enable amavisd spamassassin

[5]	Configure Postfix.

[root@mail ~]#

vi /etc/postfix/main.cf

# add follows to the end

content_filter=smtp-amavis:[127.0.0.1]:10024

[root@mail ~]#

vi /etc/postfix/master.cf

# add follows to the end

smtp-amavis unix -    -    n    -    2 smtp
    -o smtp_data_done_timeout=1200
    -o smtp_send_xforward_command=yes
    -o disable_dns_lookups=yes
127.0.0.1:10025 inet n    -    n    -    - smtpd
    -o content_filter=
    -o local_recipient_maps=
    -o relay_recipient_maps=
    -o smtpd_restriction_classes=
    -o smtpd_client_restrictions=
    -o smtpd_helo_restrictions=
    -o smtpd_sender_restrictions=
    -o smtpd_recipient_restrictions=permit_mynetworks,reject
    -o mynetworks=127.0.0.0/8
    -o strict_rfc821_envelopes=yes
    -o smtpd_error_sleep_time=0
    -o smtpd_soft_error_limit=1001
    -o smtpd_hard_error_limit=1000

[root@mail ~]#

systemctl restart postfix

[6]	It' OK all. [X-Virus-Scanned: ***] lines are added in the header section of emails after this configuration and emails with known Virus will not sent to Clients.

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