January 2005
Intermediate to advanced
544 pages
23h 44m
English
Content preview from Linux Server Security, Second Edition
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,
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.
This is the Title of the Book, eMatter Edition
Copyright © 2007 O’Reilly & Associates, Inc. All rights reserved.
Stunnel and OpenSSL: Concepts
|
163
On the client system, you could simply run a telnets-capable Telnet client (they do
exist), or you could run Stunnel in client mode, using a service definition like that in
Example 5-8.
You could then use the stock Linux telnet command to connect to the client host’s
local Stunnel forwarder:
[schmoe@skillet ~]$ telnet localhost telnets
Sparing you the familiar Telnet session that ensues, what happens in this example is
the following:
1. Your telnet process connects to the local client-mode Stunnel process listening
on port TCP 992.
2. This client-mode Stunnel process opens an encrypted SSL tunnel to the server-
mode Stunnel process listening on port TCP 992 on the remote system.
3. Once the tunnel is established, the remote (server-mode) Stunnel process starts
its local in.telnetd daemon.
4. The client-mode Stunnel process then forwards your Telnet session through the
tunnel, and the remote Stunnel daemon hands the Telnet packets to the in.telnetd
service it started.
By the way, if I haven’t made this clear yet, the client and server Stunnel processes
may use different listening ports. Again, just make sure that on each host:
• You choose a port not already being listened on by some other process.
• The client daemon sends to the same port on which the
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.
Read now
Unlock full access
More than 5,000 organizations count on O’Reilly
O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.