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⇤ ← Revision 6 as of 2012-08-09 22:04:51 →
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← Revision 19 as of 2012-10-31 22:21:43 → ⇥
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Editor: RokSosic
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=== Configure your OS === Please note that all the tools are already configured on [[Bruce]], [[Rambo]] and [[Zarya]].
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=== 1. Configure your OS ===
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 * Configure CentOS 5: SshKerberosCentos5
 * Configure Mac OS X: SshKerberosMac
 * More OSs coming soon...
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=== Configuring CentOS 6 ===

==== Get the krb5.conf ====
CentOS has the Kerberos tools installed by default. So no need to install those. First we'll need the krb5.conf configuration file. We probably don't need the whole configuration prepared by the CS, but it doesn't hurt to have it around either. Let's steal the file from hulk (sorry, you'll still have to login with a password):

{{{
sudo scp your_cs_id@hulk:/etc/krb5.conf /etc/krb5.conf
}}}

If you are running as root, you can omit the ''sudo'' prefix.

==== Install AFS tools ====

In order to use the Kerberos credentials to access the AFS file system, we need to install some AFS tools. But first, add a repository with the packages of those tools:

{{{
sudo vim /etc/yum.repos.d/openafs.repo
}}}

Copy the following lines to /etc/yum.repos.d/openafs.repo:

{{{
[openafs]
name=OpenAFS 1.6.1 for RHEL $releasever - $basearch
baseurl=http://dl.openafs.org/dl/openafs/1.6.1/rhel-$releasever/$basearch/
enabled=1
gpgcheck=0
gpgkey=file:///etc/pki/rpm-gpg/RPM-GPG-KEY-OPENAFS
priority=10
}}}

Now install the openafs-krb5 package:

{{{
sudo yum install openafs-krb5
}}}

And finally, create a configuration file for the AFS tools:

{{{
echo "cs.stanford.edu" >> /usr/vice/etc/ThisCell
}}}

=== How to use it this? ===
 === 2. Use the Kerberos tools ===
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This command will obtain a Kerberos ticket for the account ''your_cs_id''. Now you can login to the CS managed machines without using a password (provided that you are logging in as ''your_cs_id'', of course).		 This command will ask you for the password of ''your_cs_id'' and obtain a Kerberos ticket for the account ''your_cs_id''. Now you can login to the CS managed machines without using a password (provided that you are logging in as ''your_cs_id'', of course).
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kinit -l 30d johns kinit -l 30d your_cs_id
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You can obtain a ticket for any username if you have a password for that usename (so my username is ''js'' on the local machine I can still obtain the ticket for my johns CS account).  You can obtain a ticket for any username if you have a password for that usename (so my username is ''js'' on the local machine I can still obtain the ticket for my johns CS account).
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SSH and Kerberos

This page describes how to tackle the issue of CS managed machines (e.g. hulk and rocky) not allowing you to login without a password via SSH.

Please note that all the tools are already configured on Bruce, Rambo and Zarya.

1. Configure your OS

2. Use the Kerberos tools

Get a ticket

Whenever you would like to log in to CS managed machines (e.g. hulk, rocky) just open a terminal and enter: 

kinit your_cs_id

This command will ask you for the password of your_cs_id and obtain a Kerberos ticket for the account your_cs_id. Now you can login to the CS managed machines without using a password (provided that you are logging in as your_cs_id, of course).

If you would like to manually specify the lifetime of the Kerberos ticket, you can do it with the -l switch: 

kinit -l 30d your_cs_id

The command above will issue a ticket with a lifetime of 30 days for the username johns.

You can obtain a ticket for any username if you have a password for that usename (so my username is js on the local machine I can still obtain the ticket for my johns CS account).

Listing your tickets

You can list all of the tickets that you currently posses with the klist command: 

klist

Deleting tickets

There may be a case when you do not need the Kerberos ticket any more and you want to delete. No problem, you can do this: 

kdestroy
last edited 2012-10-31 22:21:43 by RokSosic