Postfix + Clamav + Amavisd2017/07/23

	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 };
        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;

[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. These lines below are added in the header section of emails after this configuration and emails with known Virus will not sent to Clients.

Matched Content