path: root/postfix/anti-uce.sh

#!/bin/bash

set -e

paramdir="/etc/local-COMMON/postfix"
confdir="/etc/postfix"
sp='[[:space:]]'

function getlinesfromfile() {
    param="$1"
    echo -n "$param = "
    cat $paramdir/$param | grep -v '^#' | sed 's/#.*//' | tr "\n" "," | sed -e 's/^[, ]*//' -e 's/[, ]\+/,/g' -e 's/,$//'
}

postconf -e "smtpd_helo_required = yes"
postconf -e "`getlinesfromfile permit_mx_backup_networks`"
postconf -e "`getlinesfromfile maps_rbl_domains`"
postconf -e "`getlinesfromfile smtpd_recipient_restrictions`"

# These options can be fatal if no SASL plugins are available!
if dpkg -L libsasl-modules-plain &> /dev/null; then
    mkdir -p $confdir/sasl
    echo "pwcheck_method: pam" >$confdir/sasl/smtpd.conf
    echo "auto_transition: false" >>$confdir/sasl/smtpd.conf
    groups postfix | grep shadow &>/dev/null || adduser postfix shadow
    cp -a $confdir/master.cf $confdir/master.cf.old
    cat $confdir/master.cf.old | sed \
        "s/^\(smtp$sp\+inet\($sp\+[n-]\)\{2\}$sp\+\)[n-]\(\($sp\+-\)\{2\}$sp\+smtpd\).*/\1n\3 -o smtpd_sasl_auth_enable=yes/" \
        "s/^#?\(\(smtps|587\)$sp\+inet\($sp\+[n-]\)\{2\}$sp\+\)[n-]/\1n/" \
        > $confdir/master.cf
    postconf -e "smtpd_use_tls = yes"
    postconf -e "smtpd_tls_auth_only = yes"
    postconf -e "smtpd_sasl_auth_enable = no"
    postconf -e "broken_sasl_auth_clients = yes"
    postconf -e "smtpd_sasl_security_options = noanonymous"
    postconf -e "smtpd_sasl_local_domain = \$myhostname"
    postconf -e "smtpd_tls_cert_file = /etc/ssl/certs/postfix.crt"
    postconf -e "smtpd_tls_key_file = /etc/ssl/certs/postfix.key"
    postconf -e "tls_random_source = dev:/dev/urandom"
    postconf -e "tls_daemon_random_source = dev:/dev/urandom"
fi

/etc/init.d/postfix reload

# Based on this: http://jimsun.linxnet.com/misc/postfix-anti-UCE.txt
# Support for trusted MX backup networks added
# PCRE stuff avoided, as PCRE is only optional on newest Debian packages
# RBLs replaced with those recommended by http://www.antispews.org/

# Here's a convenient overview of different blackholes:
#   http://rbls.org/

# smtpd_tls_CAfile