Authenticating SSH login on a Cisco IOS switch to AD

[Gary Gatten]

Authentication with ntlm-auth and "require-membership-of" works well for us.  Right now we simply authenticate the login/vty session with AD, and the secret is "authorized" locally by the switch.  So, each person gets the vty session with their own unique credentials validated via ntlm-auth and AD.  Everyone knows the secret password.  Works well.  On our "dev" FR instance I have an FR users file to return various Cisco attribute-value pairs.  This works well too.  Somewhere down the road I'll go for a full authorization process with AD on the back side, or since a relatively small number of users access our gear, might just stick to users file.  Guess it depends how skilled I get with LDAP/AD/unlang/whatever else...
G


________________________________
From: freeradius-users-bounces+ggatten=waddell.com at lists.freeradius.org [mailto:freeradius-users-bounces+ggatten=waddell.com at lists.freeradius.org] On Behalf Of Brett Littrell
Sent: Wednesday, February 09, 2011 9:57 AM
To: FreeRadius users mailing list
Subject: Re: Authenticating SSH login on a Cisco IOS switch to AD

Hi Chris,

    We use TACACS+ to administer our switches here and I can tell you that I had to add extra stuff to the TACACS replies to allow authorization to manage the switches.  So you may be able to login via radius but somewhere you are going to have to send information to the switch on what authorization is given per user.  This means that your going to have to have AD respond with this information or have some other method that will inject those values when you login.

    I think it is possible but I do not think it will be to easy if you are only using AD as the back-end, you may need to use local files to define groups with attributes or some scripts to inject the values Cisco wants.

Hope that helps.



Brett Littrell
Network Manager
MUSD
CISSP, CCSP, CCVP, MCNE


>>> On Wednesday, February 09, 2011 at 7:24 AM, in message <604AAF035805AB46B4F293945AE8F9FC182FEB879C at pzex01-07>, "Schaatsbergen, Chris" <Chris.Schaatsbergen at aleo-solar.de> wrote:
Greetings all,

We have a couple of Cisco switches that we administer using SSH sessions. Now I have been asked if we can authenticate the SSH login on our Windows 2008 Active Directory using our Freeradius (2.1.10) installation.

I have been looking and found:
http://wiki.freeradius.org/Cisco
for authenticating inbound shell users and
http://deployingradius.com/documents/configuration/active_directory.html
for authenticating users on AD.

Now I am trying to combine those two.

On the Freeradius server Samba and Kerberos are configured, the ntlm_auth returns an NT_STATUS_OK.

First question: Would this at all be possible?

And if so my second question: Unfortunately, when I add ntlm_auth to the authenticate section of sites-enabled/default and run freeradius -X I get an error that the ntlm_auth module could not be loaded though I have created the ntlm_auth file in the modules folder as described in the link. How should I get that to work?

Help would be highly appreciated.

Chris Schaatsbergen

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