Question

Cisco ASA 5510 and Active Directory (part 2)

Asked by: Jay_Jay70

further questions on AD integrated VPN Authorisation - below is what I have theorised and need some help on so far....

ASDM -> Configuration -> AAA/Local Users -> AAA Server Groups

1.      AAA Server Group Setup (RAIDUS) to our IAS Server Internally (10.240.0.4) (This runs a policy that says only members of windows group VPN Users can authenticate)
2.      AAA Server Group Setup (LDAP) to our LDAP Server Internally (10.240.0.100) and basing its search on our LDAP Server Internally For Groups for the ASA to view

ASDM -> Configuration -> Network (Client) Access -> Dynamic Access Policies

1.      Create new policy for each network access requirement type
2.      Base Policy on AAA Attribute ldap.memberOf (AD Group Member)
3.      Ignore Endpoint attributes
4.      Set Action to Continue
5.      Apply Network ACL Filter

Thoughts and Questions
1.      From what I have read and the understanding I have of this, the following process is followed:
a.      User attempts a connection via VPN using the VPN Client.
i.      User must be a member of the AD Base Group of VPN Users of which IAS will then authenticate the user for the ASA
b.      Once the ASA has established that the user can authenticate it will establish a tunnel,
c.      The ASA will next apply the Dynamic Access Policies which contain further group membership rules and ACLs.

Now, if the above theory is correct, then there are a few things that need to be dealt with
a)      The default DAP Is set to Continue All connections. This is the last policy that is applied, so obviously, we would need to change this to Terminate All connections. If a match is found in a policy before the default is applied, then the connection will continue without processing the Default Access policy

Adding to this, the Network ACL Filters Assigned within the DAP Itself, will only allow ACLs that have specific Allow or specific Deny meaning that ACLs must be independently built for each group requirement, so if a member of VPN RDP Allowed is authenticated, it would need an ACL containing only allowed RDP traffic to certain servers. Same theory for each different server. We cant have an ACL with allow and deny together. Must be split (We can however have multiple ACLs assigned to each DAP)

How do we go about assigning new ACLs to just VPN Dial in sessions considering that our dial in users have a certain IP range specified by the ASA (172.X.X.X)? My concern is that I dont want these ACLs affecting anything bar VPN dial in and only want them applied to a group

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Asked On
2009-08-25 at 00:18:07ID24678947
Tags

Cisco

,

ASA

,

Active Directory

Topics

Virtual Private Networking (VPN)

,

Active Directory

,

Networking Hardware Firewalls

Participating Experts
1
Points
500
Comments
5

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Answers

 

by: chukuPosted on 2009-08-25 at 05:53:28ID: 25176981

the above is correct
I do not understand the problem you see here...
once you authenticate a user via VPN as a domain user in AD you know he is as good as any LAN user. he will not be able to use resources in the LAN unless he got the right credentials. you can limit the subnets he will have access to and the ports he is using - all via the ACL for the VPN but he shouldn't be considered as a threat

if you still have a problem here, please specify it and show in code where is the problem

 

by: Jay_Jay70Posted on 2009-08-25 at 17:20:53ID: 25183494

Thanks for the reply...I dont have a problem as such, just trying to get a grasp on the concepts....my main point of confusion is as follows

my vpn users get an IP in the range of 172.20.0.0/24.....so obviously my ACL's will be based on that subnet as the source, and anywhere else as a destination....If I enable the ACL, and it into the DAP that restricts a certain set of users.....does this ACL only apply when used in DAP processing?

for example, i might have my IT group that i want to have full access to every resource in the business, but i might have a HR group who needs access only to a couple of resources....when they dial in, they each get an IP in the above mentioned range...If i specify ACL's based on that range, and assign them into individual DAP's, does this then only take affect when the DAP processes? so the ACL that is specified in the HR DAP, wont affect the IT DAP?

Sorry if its confusing, my head is a little lost :)

James

 

by: chukuPosted on 2009-08-25 at 19:23:44ID: 25184020

That is true. You will have the same credentials to both groups. You can pass it by adding Radius authenication to VPN and then each user has his own domain credentials

 

by: Jay_Jay70Posted on 2009-08-25 at 19:26:05ID: 25184029

raidus authentication is already there, its all integrating nicely, its just the positioning and of the ACL's and how they apply that get me....guess most of it will be trial through fire really....grrr never fun...i just dont the ACL's I apply to one group, to apply to ALL traffic from that subnet....so basically need acl's applied via AD group membership :) the rest is easy :)

 

by: Jay_Jay70Posted on 2009-10-08 at 18:28:57ID: 25531777

I figured this one out with persistence and trial and error

LDAP for Authentication, DAP policies to allow specific traffic to and from based on user.....

20120131-EE-VQP-002

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