Fedora 27
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Postfix + Clamav + Amavisd2017/12/23
 
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 clamav-server clamav-server-systemd
[root@mail ~]#
cp /usr/share/doc/clamav-server*/clamd.sysconfig /etc/sysconfig/clamd.amavisd

[root@mail ~]#
vi /etc/sysconfig/clamd.amavisd
# line 1,2: uncomment and change

CLAMD_CONFIGFILE=/etc/clamd.d/
amavisd.conf

CLAMD_SOCKET=/var/run/
clamd.amavisd
/clamd.sock
[root@mail ~]#
vi /etc/tmpfiles.d/clamd.amavisd.conf
# create new

d /var/run/clamd.amavisd 0755 amavis amavis -
[root@mail ~]#
vi /usr/lib/systemd/system/clamd@.service
# add follows to the end

[Install]
WantedBy=multi-user.target
[root@mail ~]#
systemctl start clamd@amavisd

[root@mail ~]#
systemctl enable clamd@amavisd

[3] If SELinux is enabled, add rules like follows.
[root@mail ~]#
dnf -y install checkpolicy policycoreutils-python-utils
[root@mail ~]#
setsebool -P antivirus_can_scan_system on

[root@mail ~]#
setsebool -P antivirus_use_jit on

[root@mail ~]#
vi amavisd.te
# create new

module amavisd 1.0;

require {
        type antivirus_t;
        type antivirus_exec_t;
        type antivirus_db_t;
        type antivirus_var_run_t;
        type init_t;
        type razor_port_t;
        type amavisd_send_port_t;
        type tmpreaper_exec_t;
        class file { append create getattr execute_no_trans ioctl link open read rename setattr unlink write lock map };
        class dir { add_name create read remove_name setattr write rmdir };
        class tcp_socket name_connect;
        class sock_file write;
        class process execmem;
        class unix_stream_socket connectto;
}

#============= init_t ==============
allow init_t antivirus_t:unix_stream_socket connectto;
allow init_t antivirus_exec_t:file { execute_no_trans ioctl };
allow init_t amavisd_send_port_t:tcp_socket name_connect;
allow init_t antivirus_db_t:dir { add_name create read remove_name setattr write rmdir };
allow init_t antivirus_db_t:file { append create getattr ioctl link open read rename setattr unlink write lock };
allow init_t antivirus_var_run_t:file { create write };
allow init_t antivirus_var_run_t:sock_file write;
allow init_t razor_port_t:tcp_socket name_connect;
allow init_t tmpreaper_exec_t:file execute_no_trans;
allow init_t self:process execmem;
allow antivirus_t antivirus_db_t:file map;
[root@mail ~]#
checkmodule -m -M -o amavisd.mod amavisd.te

checkmodule: loading policy configuration from amavisd.te
checkmodule: policy configuration loaded
checkmodule: writing binary representation (version 17) to amavisd.te
[root@mail ~]#
semodule_package --outfile amavisd.pp --module amavisd.mod

[root@mail ~]#
semodule -i amavisd.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';
[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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