100 lines
3.1 KiB
HTML
100 lines
3.1 KiB
HTML
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<head>
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<title>postfwd2 - chroot setup</title>
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<link rel="stylesheet" type="text/css" href="http://www.jpkessler.de/css/postfwd.css">
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<meta http-equiv="Content-Type" content="text/html;charset=utf-8" >
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<meta name="description" content="postfwd version differences">
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<meta name="author" content="jpk">
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<meta name="keywords" content="postfwd, postfwd 2 chroot, postfwd usage, postfwd manual, postfix, policy, policy delegation, firewall, postfix acl, postfix acls, pfwpolicy, postfw, restrictions, IT-Security, IT-Consulting, Jan, Peter, Kessler">
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</head>
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<body>
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<p>
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<h1>postfwd2 - chroot setup</h1><br>
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If you care about security and want to run postfwd2 within a chroot environment you have to setup it up before. This document will give you an idea about what has to be prepared.
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<p><pre>
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How to create a minimal chroot environment for postfwd2
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=======================================================
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Tested with SLES 11 x86_64, customize this to suit your specific system.
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For example, on SLES 10 x86_64, use perl version 5.8.8 instead of 5.10.0
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and glibc version 2.4 instead of 2.11.1.
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cd $CHROOTDIR
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for dir in tmp dev var var/tmp etc lib64 usr usr/lib usr/lib/perl5 \
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usr/lib/perl5/site_perl \
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usr/lib/perl5/site_perl/5.10.0 \
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usr/lib/perl5/site_perl/5.10.0/Net \
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usr/lib/perl5/site_perl/5.10.0/Net/Server \
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usr/lib/perl5/site_perl/5.10.0/Net/Server/Proto ; do
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mkdir $dir
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chmod --reference /$dir $dir
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chown --reference /$dir $dir
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done
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for file in dev/null etc/protocols etc/localtime etc/resolv.conf \
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lib64/libnss_files-2.11.1.so lib64/libnss_files.so.2 \
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usr/lib/perl5/site_perl/5.10.0/Net/Server/Proto/TCP.pm \
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usr/lib/perl5/site_perl/5.10.0/Net/Server/Proto/UNIX.pm ; do
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cp -p /$file $file
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done
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grep nobody /etc/passwd > etc/passwd
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grep nobody /etc/group > etc/group
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echo -e 'passwd: files\ngroup: files\nprotocols: files' > etc/nsswitch.conf
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=> Configure your syslog daemon to listen to $CHROOTDIR/dev/log:
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echo 'SYSLOGD_ADDITIONAL_SOCKET_POSTFWD="$CHROOTDIR/dev/log"' \
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>> /etc/sysconfig/syslog
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/etc/init.d/syslog restart
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=> Place your postfwd configuration in $CHROOTDIR:
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cp $POSTFWDCONF $CHROOTDIR/etc/postfwd.conf
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=> Start postfwd2:
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/usr/local/sbin/postfwd2 --file=/etc/postfwd.conf --chroot=$CHROOTDIR
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List of directories
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===================
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tmp
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lib64
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dev
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var
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var/tmp
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etc
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usr
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usr/lib
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usr/lib/perl5
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usr/lib/perl5/site_perl
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usr/lib/perl5/site_perl/5.10.0
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usr/lib/perl5/site_perl/5.10.0/Net
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usr/lib/perl5/site_perl/5.10.0/Net/Server
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usr/lib/perl5/site_perl/5.10.0/Net/Server/Proto
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List of files
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=============
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lib64/libnss_files.so.2
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lib64/libnss_files-2.11.1.so
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dev/null
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dev/log
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etc/localtime
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etc/protocols
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etc/postfwd.conf
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etc/nsswitch.conf
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etc/passwd
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etc/resolv.conf
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etc/group
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usr/lib/perl5/site_perl/5.10.0/Net/Server/Proto/UNIX.pm
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usr/lib/perl5/site_perl/5.10.0/Net/Server/Proto/TCP.pm
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</pre></p>
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Thanks to Lukas Wunner for providing this howto and the patch for postfwd2!
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</body>
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</html>
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