oss-security - Postfix incorrect permissions on configurations. Request.

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Message-ID: <5EA177BBB85E4EF4900F47CD51F0323E@wildbit.com>
Date: Tue, 9 Apr 2013 14:08:20 -0400
From: Russ Thompson <russ@...dbit.com>
To: oss-security@...ts.openwall.com
Subject: Postfix incorrect permissions on configurations. Request.

Postfix is setting the following permissions by default on Debian Squeeze.  I'm seeing roughly the same on RHEL/CentOS 6.x, this appears to be a requirement of "sendmail.postfix"  

0755 /etc/postfix
0644 /etc/postfix/*
0755 /etc/postfix-script
0755 /etc/post-install

Which allows all users to execute these scripts and read configurations.  Setting to tighter/more typical permissions (i.e 640) results in:  postfix/sendmail[21007]: fatal: open /etc/postfix/main.cf: Permission denied

Thanks
- Russ

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