How to configure Single-Sign-On using OpenSSH on Linux. (4263009)

Configure SSH for Active Directory and Authentication Services

In order to achieve SSO OpenSSH first needs to be configured to logon to Active Directory. If Authentication Services is installed and configured you can make sure that PAM is properly configured by running the following command;
/opt/quest/bin/vastool status

This should not return any errors concerning SSH or PAM.

For most linux operating systems the following settings should be configured for ssh in /etc/ssh/sshd_config

UsePAM yes
ChallengeResponseAuthentication yes
PasswordAuthentication yes
GSSAPIAuthentication yes
GSSAPICleanupCredentials yes

Some linux systems may require "PAMAuthenticationViaKbdInt yes" instead of "UsePAM yes"

Once sshd_config is set the service should be restarted.

Configure SSH for Single Sign On for GSSAPI

To achieve Single-Sign-On the OpenSSH package needs to support GSSAPI authentication. The configurations on these linux systems are similar.

RedHat Linux and derivatives; e.g. CentOS, Fedora
Suse Linux
Debian Linux and derivatives; e.g. Ubuntu

In this example we assume the realm COMPANY.COM, with an Active Directory controller at ad.company.com

The ssh client should be configured to use GSSAPI as well.
Edit /etc/ssh/ssh_config and add the following lines:

GSSAPIAuthentication yes
GSSAPIDelegateCredentials yes

Configure Kerberos

You can either directly symlink /etc/krb5.conf to /etc/opt/quest/vas/vas.conf, or create a separate /etc/krb5.conf. Before doing that, save the original one.
# mv /etc/krb5.conf /etc/krb5.conf.orig

Then, either create the symlink:
# ln -s /etc/opt/quest/vas/vas.conf /etc/krb5.conf

or manually create your own by following these steps:
Create an empty file /etc/krb5.conf and add these lines:
libdefaults]
default_realm = COMPANY.COM
default_keytab_name = /etc/opt/quest/vas/host.keytab
forwardable = true

Then run this command as root:
# /opt/quest/bin/vastool -u host/ info toconf /etc/krb5.conf

Single Sign On from one enabled machine should work to another enabled machine.