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Linux Server Security, Second Edition
book

Linux Server Security, Second Edition

by Michael D. Bauer
January 2005
Intermediate to advanced content levelIntermediate to advanced
544 pages
23h 44m
English
O'Reilly Media, Inc.
Content preview from Linux Server Security, Second Edition
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
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Chapter 9: Securing Internet Email
Running Postx in a chroot Jail
One of the niftier things you can do to secure Postfix is to run selected parts of it
chrooted (see Chapter 6 for more information on the chroot technique). This usually
requires you to create copies of things needed by the chrooted process. For example,
if the process looks for /etc/mydaemon.conf on startup but is chrooted to /var/mydae-
mon, the process will actually look for mydaemon.conf in /var/mydaemon/etc/mydae-
mon.conf.
Happily, the preparations required to chroot Postfix are explained for a variety of
architectures, including Linux, in the examples/chroot-setup subdirectory of the Post-
fix source code. If you install Postfix from a binary package, the package may have
an installation script to make these preparations for you automatically after install-
ing Postfix. In SUSE, for example, the Postfix RPM package runs a script that creates
a complete directory tree for chrooted Postfix processes to use (etc, usr, lib,andso
forth). This directory tree then resides in /var/spool/postfix (the default Postfix home
directory and therefore the logical place to chroot its processes to), with the appro-
priate ownerships and permissions preset.
If your binary distribution doesn’t do this for you, simply download
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Publisher Resources

ISBN: 0596006705Supplemental ContentCatalog PageErrata