June 2003
Intermediate to advanced
336 pages
9h 49m
English
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The kserver Access Method
The kserver
method is used to connect using
Kerberos 4. If you do not have an existing Kerberos 4 installation on
your CVS repository server, I recommend you use Kerberos 5. Kerberos
4 has known weaknesses that Kerberos 5 resolves. This section assumes
that you have an existing Kerberos 4 installation and the
documentation to configure and use it.
Tip
Kerberos 4 is a reasonably secure authentication system, but it has known flaws. Kerberos 5 fixes some of them; most critically, it prevents a replay attack. In Kerberos 4, there is a five-minute window in which an attacker can sniff an authentication request, modify and re-send it, and get an authentication ticket. Kerberos 5 allows only one ticket to be produced per request.
The repository path format for Kerberos is:
:kserver:[user@]hostname[:[port]]/path
The default port for kserver is 1999. If
user is not specified, the client sends the
username of the calling user on the client computer.
The CVS client and server must both be compiled to run Kerberos 4. If
you intend to encrypt the data stream, you also need to have
encryption enabled at compile time. You can test whether your CVS
program has compiled kserver support by checking
the command list, as shown in Example 8-11.
Example 8-11. Testing for kserver mode
bash-2.05a$ cvs --help-commands
CVS commands are:
.
.
.
kserver Kerberos server mode
.
.
.
(Specify the --help option for a list of other help options)You can test for encryption support by checking ...
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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.