Secure Outgoing SMTP via Postfix, Courier, TLS and SASL

From Wiki

• OK. First off: apt-get

apt-get install postfix-tls libsasl2 sasl2-bin libsasl2-modules

Main Website used for Config: http://www.falkotimme.com/howtos/perfect_setup_debian_sarge/index.php

Secondard Website - however uses a different Auth file: http://www.tribulaciones.org/docs/postfix-sasl-tls-howto.html

More Good Info & a SIMPLE WAY TO OVERCOME CHROOT -> http://wiki.ev-15.com/debian:mail_system

• Configing:
  

/etc/postfix/main.cf
/etc/postfix/sasl/smtpd.conf
/etc/postfix/ssl/* - tls certs

1. 
# SASL Support
smtpd_sasl_local_domain =
smtpd_sasl_auth_enable = yes
smtpd_sasl_security_options = noanonymous
broken_sasl_auth_clients = yes
smtpd_recipient_restrictions = permit_sasl_authenticated,permit_mynetworks,reject_unauth_destination

2.
# SASL Auth
vi /etc/postfix/sasl/smtpd.conf
pwcheck_method: saslauthd
mech_list: plain login

3.
# TLS Certs
mkdir /etc/postfix/ssl
cd /etc/postfix/ssl/
openssl genrsa -des3 -rand /etc/hosts -out smtpd.key 1024
chmod 600 smtpd.key
openssl req -new -key smtpd.key -out smtpd.csr
openssl x509 -req -days 3650 -in smtpd.csr -signkey smtpd.key -out smtpd.crt
openssl rsa -in smtpd.key -out smtpd.key.unencrypted
mv -f smtpd.key.unencrypted smtpd.key
openssl req -new -x509 -extensions v3_ca -keyout cakey.pem -out cacert.pem -days 3650


# TLS Config in /etc/postfix/main.cf
# Moving onto TLS on its own.
smtpd_tls_auth_only = yes
smtp_use_tls = yes
smtpd_use_tls = yes
smtp_tls_note_starttls_offer = yes
smtpd_tls_key_file = /etc/postfix/ssl/smtpd.key
smtpd_tls_cert_file = /etc/postfix/ssl/smtpd.crt
smtpd_tls_CAfile = /etc/postfix/ssl/cacert.pem
smtpd_tls_loglevel = 1
smtpd_tls_received_header = yes
smtpd_tls_session_cache_timeout = 3600s
tls_random_source = dev:/dev/urandom

• Restart Postfix
  

Now continuing onto Auth
Because postfix runs chrooted - need to move the /var/run dir

mkdir -p /var/spool/postfix/var/run/saslauthd
rm -fr /var/run/saslauthd

Edit /etc/default/saslauthd

Remove # in front of START=yes
Add the line PARAMS="-m /var/spool/postfix/var/run/saslauthd"

Edit /etc/init.d/saslauthd

Add a # to dir=`dpkg-statoverride --list $PWDIR`
Add in dir=".... below the PIDFILE entry
#dir=`dpkg-statoverride --list $PWDIR`
Change PWDIR and PIDFILE to the following:
PWDIR="/var/spool/postfix/var/run/${NAME}"
PIDFILE="${PWDIR}/saslauthd.pid"
dir="root sasl 755 ${PWDIR}"

• Save & Close
• restart saslauthd
• /etc/init.d/saslauthd start
• MAKE SURE TO ADJUST FIREWALL - OPEN UP PORT 111 Locally