Cisco ISE Configuration for Third-Party Plug-in

Policy Enforcer's Cisco ISE Connector communicates with the Cisco Identity Services Engine server using the Cisco ISE API. As part of threat remediation, Policy Enforcer's Connector uses enforcement profiles. This section provides information for configuring Cisco ISE so that Policy Enforcer can invoke the appropriate enforcement profiles.

As part of the configuration, on Cisco ISE you will create two enforcement profiles, one for quarantine and one for terminate. Then you will use them in the Cisco ISE enforcement policy. Once Cisco ISE is configured, you will configure a Cisco ISE Connector on Policy Enforcer.

On Cisco ISE you will configure the following:

Change policy modes
Create an API client
Configure network profiles
Add a custom attribute
Configure authorization profiles
Set an authorization policy

On Cisco ISE, the Simple Mode policy model is selected by default. For creating an API client, Policy Sets should be enabled.

Navigate to Administration > System > Settings > Policy Sets and Enable Policy Sets mode.
You are prompted to login again after changing the mode.
Figure 113: Cisco ISE: Enable Policy Sets Mode

Procedure

Create an API Client:

Using the Cisco ISE web UI, create an Admin User by navigating to Administration > System > Admin Access > Administrator > Admin User.
Create an Admin User and assign it to the following Admin Groups: ERS Admin, MnT Admin.
Make note of the username and password. You will need them when you configure the connector portion in Policy Enforcer later on.
Figure 114: Cisco ISE: Create Admin User and Assign to Admin Groups

Procedure

Enable the External RESTful Services API (ERS) for the Administration Node:

Navigate to Administration > System > Settings >ERS Settings and select Enable ERS for Read/Write.
Click Save.
Figure 115: Cisco ISE: Enable ERS

Procedure

Configure network profiles:

Devices managed by ISE must support RADIUS CoA and have the proper network profiles assigned to handle the CoA commands sent by the ISE server:

Navigate to Administration > Network Resources > Network Device Profiles and verify the existing network device profile list.
If you are creating a new profile, proceed to the next step for information.
Figure 116: Cisco ISE: Network Device Profiles List
If you are configuring a new profile, you must minimally set the following:
- Enable RADIUS and add a corresponding dictionary in the supported protocol list.
  Figure 117: Cisco ISE: Network Device Profile, Enable RADIUS
- Enable and configure the Change of Authorization (CoA) according to the figure below.
  Figure 118: Cisco ISE: Configure Change of Authorization (CoA)
- Configure the Disconnection and Re-authenticate operation with the proper RADIUS attributes and vendor specific VSA to handle the standard disconnect and reauthenticate operations. Below is the sample configuration for Juniper’s EX devices.
  Figure 119: Sample Configuration for Juniper EX

Procedure

Configure a custom attribute.

Navigate to Administration > Identity Management > Settings > Endpoint Custom Attribute and add attribute sdsnEpStatus with type string.
Figure 120: Cisco ISE: Add Attribute sdsnEpStatus
Verify the attribute under Policy > Policy Elements > Dictionaries > System > Endpoints.
Figure 121: Cisco ISE: Verify Attribute
Navigate to Policy > Policy Elements > Conditions > Authorization > Simple Conditions. Add there authorization simple conditions using the sdsnEpStatus attribute you created.
In the screen below,, there are three conditions created using sdsnEpStatus attribute. The condition names do not need to be the same as in the screen here, but the expressions must be matched. These conditions will be used in Policy Sets to handle the threat remediation for managed endpoints as described later in the Policy Sets setting section. Only the sdsnEpStatus-blocked and sdsnEpStatus-quarantine conditions will be used there. sdsnEpStatus-healthy is created for fulfillment purpose and can be ignored for now.
Figure 122: Cisco ISE: Configure Simple Conditions, Match Expression
Figure 123: Cisco ISE: Configure Simple Conditions, Match Expression

Procedure

Configure permission/authorization profiles.

You can create the authorization profiles corresponding to “block” and “quarantine” actions as fits your needs. In the sample configuration provided here, the block action will result as total denial access to the network, and the quarantine profile will move the endpoint to another designated VLAN.

Navigate to From Policy > Policy Elements > Results > Authorization > Authorization Profiles.
Refer to the figures below for sample configurations.
Figure 124: Cisco ISE: Configure Authorization Profiles
Figure 125: Cisco ISE: Configure Authorization Profiles
Note For blocking a host, the default ‘DenyAccess’ profile is used.

Procedure

Set the authorization policy:

Create two rules as Local Exceptions, applying the conditions and authorization/permission profiles we created in the previous step. Names may be different, but these two rules must be at the top of the Exception list.
Refer to the figure below for a sample configuration.
Figure 126: Cisco ISE: Local Exception Rules, Example
Note Find this under Policy > Policy Sets > Authorization Policy.
Proceed to Creating a Policy Enforcer Connector for Third-Party Switches to finish the configuration with Policy Enforcer.