3 Replies Latest reply: Oct 12, 2017 4:19 PM by hslai RSS

ISE 2.2 IdentityAccessRestriction Behavior

thwall

Team,

 

I have been researching the use cases behind the IdentityAccessRestriction attribute in ISE and have encountered an issue which may be expected but i'd like your inputs.

 

Our flow is to connect using our smart card certificates to an ASA. The ASA strips out the CN field of the certificate (thomas.wall@example.com) and then sends that via RADIUS to ISE using PAP ASCII. In ISE, we have an authentication policy which continues even if authentication fails (which it does in this flow as there are no passwords sent). Once we continue past the authentication policy, we start looking at the authorization policies.  We then match a policy which checks the username against the AD store which validates the user is a member of a certain group and is then permitted access.

 

We are looking at using the ISE attribute IdentityAccessRestriction in addition to the rule above to check to see if the account is disabled or outside the logon hours specified in AD. In testing, if the AD account is disabled, we are able to successfully match on a condition which states IdentityAccessRestriction = True.  However, if the logon hours are set, ISE  does not update the IdentityAccessRestriction value to TRUE. If we perform a test user under the AD settings, ISE reports the user cannot logon due to login hour restrictions. Does the IdentityAccessRestriction attribute update for logon hours if authentication fails? IdentityAccessRestriction does update if the account is disabled and authentication fails which makes me think the query we send to AD is not pulling back the user attributes from AD which would tell us the account has logon hour restrictions.

 

The idea to use this attribute came from reading the following document

 

When authenticating or querying a user, Cisco ISE checks the following:

 

 

• MS-CHAPandPAPauthentications check if the user is disabled, locked out, expired or out of logon hours and the authentication

fails if some of these conditions are true.

 

 

• EAP-TLS authentications checks if the user is disabled or locked out and the authentication fails if some of these conditions is

met.

 

Additionally, you can can set the IdentityAccessRestricted attribute if conditions mentioned above (for example, user disabled) are

met. IdentityAccessRestricted attribute isset in order to support legacy policies and is not required in Cisco ISE because authentication

fails if such conditions (for example, user disabled) are met.

 

link: https://www.cisco.com/c/en/us/td/docs/security/ise/2-0/ise_active_directory_integration/b_ISE_AD_integration_20.pdf

 

 

Your responses are greatly appreciated.

 

-Thomas