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Old 11-01-2008, 10:44 AM   #1
mp1smw
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SSH authentication using existing AD tokens


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Hi, this question is primarilly about integration of authentication with Acitive Direcotry, but I want to go past the standard username/password access. On my windows domain I login and am given a token (or something similar) which is accepted by all network resources such as proxies and file shares etc. What I want to be able to do is have the same seamless authentication on a linux box (SUSE or Redhat Enterprise) and not have to enter my uname/pass again (as the simple LDAP scheme usually requires). In fact really I want this to happen for ssh access for reasons I will bore you with if required and have not seen this done anywhere.
Any ideas out there?

Steve
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Old 11-01-2008, 11:17 AM   #2
jschiwal
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You could use public key authentication instead. However, your private key should be protected (on the client) with a passphrase which means typing in the passphrase at least once. If you use public key authentication, and ssh-agent & ssh-add on the client, you only need to enter the passphrase once on the client. The passphrase or decrypted private key shouldn't exist anywhere.
but in your head.

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Using username/password challenge authentication is not as secure but if that is what you want to do, look at enabling PAM authentication. AFAIK, if both the client and server use AD/LDAP authentication then the ChallengeResponse ssh authentication will look to PAM to ok the login. Some disto's like SuSE have a wizard in the Users & Groups setup to set this up for you.
Also, enter the terms: "linux pam ldap ssh sso" into google. You will come up with a number of howto pages.

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I wouldn't recommend this however. Using password authentication allows brute force attacks. Using public key authentication without a passphrase protected private key is dangerous if the private key is stolen. ( This happened to Red Hat recently )
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Old 11-02-2008, 07:43 AM   #3
mp1smw
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Thanks for the quick response. It looks like there is some stuff out there I might be able to use, the main tip was earching for SSO in addition to the other words which I had already done.
I guess it will take me a nother couple of weeks to evaluate and test the many results available but at least I now have a foot in the door.
If I mange to produce a concise set of instruction for acheivig this I will add them to this thread.
Thanks,

Steve
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