Skip to Main Content
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.
166
|
Chapter 5: OpenSSL and Stunnel
On our Stunnel client system skillet, we’ll only need to add one global option, cert
(Example 5-10).
The command on skillet to run the rsync query command is exactly the same as in
Example 5-5. Although in this case, the transaction is more secure; the added secu-
rity is completely transparent to the end user.
To increase elfiero’s level of certificate verification from 2 to 3 (i.e., checking not only
for valid signatures but also for known certificates), there are only two additional
steps:
1. Concatenate a copy of skillet’s signed certificate (skillet_pubcert.pem, the version
without skillet’s key) to the end of /etc/stunnel/cacert.pem on elfiero.
2. In elfiero’s stunnel.conf file, change the value of
verify from 2 to 3.
Although it may be tempting to copy skillet_cert.pem (the combined key/certificate
file) over to elfiero in addition to or instead of skillet_pubcert.pem, please resist this
temptation: unnecessarily copying of private keys is a very bad habit to get into.
Using Stunnel on the Server and Other SSL Applications
on the Clients
Stunnel isn’t the only SSL application capable of establishing a connection to an
Stunnel daemon. For example, it’s possible to run Stunnel on a POP3 server listen-
ing on the standard pop3s port TCP 995 and forwarding ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Linux: Powerful Server Administration

Linux: Powerful Server Administration

Uday Sawant, Oliver Pelz, Jonathan Hobson, William Leemans
Linux Server Hacks

Linux Server Hacks

Rob Flickenger
Linux Server Hacks, Volume Two

Linux Server Hacks, Volume Two

William von Hagen, Brian K. Jones

Publisher Resources

ISBN: 0596006705Supplemental ContentCatalog PageErrata