Restriction of VPN AnyConnect Source (Caller-ID)

Hi all

I was wondering if it is possible on the Association or ASA to restrict access to a political group according to IP address, they come? For example, if I wanted to home users to connect to the external interface of the firewall to authenticate with a token, but if they are in the Office to connect to the internal interface and just use LDAP. The two work these options but this does not prevent someone from home to authenticate off the coast of LDAP of the House. I know that Ray has the Caller-ID field that has the IP address of the authentication device. I was wondering if it is possible to use this information on the ASA or ACS to add the control, I need. Any ideas?

Kind regards

Mike

Hi Michael,

you have several options:

-l'ASA indeed sends 2 attributes to a Radius server that contains the ip address of the client. It's 'debug RADIUS' when I connect from a client with the ip 192.168.0.98:

RADIUS: Type = 31 (0x1F) Calling-Station-Id
RADIUS: Length = 14 (0x0E)
RADIUS: Value (String) =
31 39 32 2e 31 36 38 30 2 2 39 38 |  192.168.0.98
...

RADIUS: Type = 66 Tunnel-Client-Endpoint (0x42)
RADIUS: Length = 14 (0x0E)
RADIUS: Value (String) =
31 39 32 2e 31 36 38 30 2 2 39 38 |  192.168.0.98

Now if you configure ACS to generate a different response based on the value of Calling-Station-Id or Tunnel-Client-Endpoint, I don't know (I mean I'm sure you can, but it's been a while since I have anything fancy on ACS) you can ask this question in the forum of AAA.

-If you want ASA to make the decision, you can do this with CSD (Cisco Secure Desktop - requires a license). CSD to create policies based on the features of endpoint (client) as the version of the antivirus installed, but also the ip address of the client. You may need to use in combination with DAP (dynamic access policy) to allow/deny access to a certain group, based on criteria of CSD endpoint.

- but for the scenario specific you describe, you might be able to solve this problem by simply specifying interface in the Group of authentication servers.

That is, if you currently have

attributes global-tunnel-group-of-inside
authentication-server-group MyLDAP

can change this:

attributes global-tunnel-group-of-inside
authentication-server-group (inside) MyLDAP

This will cause LDAP to be used only for connections from the inside. Other connections will use the LOCAL (so anyone with an account on the SAA will be always able to connect outside this group - in order to avoid that you can create a new aaa server group with a non-existent server and use it for external authentication).

Or maybe merge with your existing 2 groups into a single,

tunnel-group of no matter where-global attributes
authentication-server-group (inside) MyLDAP

authentication-server-group (outside MyTokenServer)

HTH

Herbert

Tags: Cisco Security

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