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12-25-2006, 05:29 AM
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#1
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Member
Registered: Nov 2003
Distribution: centos 4.4
Posts: 94
Rep:
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secure postfix installation
besides file permissions, not running it as root, chrooting it, and not having an open relay, what do i need to do to have a secure postfix server?
There are many guides on the internet on how to install postfix+..., but i am not sure if they are done with security in mind. any pointers to a good guide? i am running centos 4.4.
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12-27-2006, 02:06 AM
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#2
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Member
Registered: Mar 2006
Distribution: RedHat, Slackware, Experimenting with FreeBSD
Posts: 222
Rep:
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You could improve the security in a number of ways including disabling the VRFY function and using TLS transport encryption between the server and client machines.
postconf -e disable_vrfy_command=yes
This disables VRFY so that malicious users cannot determine valid users on your host with the VRFY command.
If your interested in reducing spam messages as well, lookup the anvil daemon that comes with postfix 2.1 and above. You may also want to use a realtime blacklist as well such as xbl-sbl.spamhaus.org.
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12-27-2006, 07:06 PM
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#3
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Senior Member
Registered: Mar 2003
Location: Beautiful BC
Distribution: RedHat & clones, Slackware, SuSE, OpenBSD
Posts: 1,791
Rep:
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This article from security focus should give you a better insight.
http://www.securityfocus.com/infocus/1593
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12-29-2006, 09:51 AM
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#4
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Member
Registered: Jun 2003
Location: SoCal
Distribution: CentOS
Posts: 465
Rep:
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Just remember to always encrypt any connection that sends a users login credentials. Make sure you use TLS/SSL for all of your email connections. If you provide a webmail interface for your users, remember to only allow webmail access over a secure HTTPS connection.
I'm assuming you're going to use SMTP authentication to prevent your server from becoming an open relay. While that is effective, all a spammer has to do is gain access to a valid user's credentials and then they will have relay access from your server.
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