Question

Authenticate Cisco ASA 5505 VPN against Active Directory

Asked by: bradibutler

Currently I'm using the built-in user database in the ASA 5505 to create users for VPN. However I'd like to integrate active directory users instead.

I have bits and pieces of what's required to do this...more so that I need to install IAS on the server, but beyond that I have no idea where to start.

Here is the set up:
-Single server SBS 2003 R2

Network Config:
-ISP Modem -> Cisco ASA 5505 -> Server 2003 R2
-DHCP provided by ASA, everything else handled on server.

Be a huge help if someone could point me in the right direction. I know it's hard to post a step-by-step for something like this, but even general steps of what I need to do and a link to some more detailed directions would be great! On the other hand, if you feel inclined to post a step-by-step don't hesitate!

Thanks in advance!

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Asked On
2009-07-27 at 05:27:16ID24602560
Tags

VPN IAS Cisco ASA 5505 Active Directory

Topics

Cisco PIX Firewall

,

Virtual Private Networking (VPN)

,

IPSec Security Protocol

Participating Experts
3
Points
500
Comments
8

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Answers

 

by: asavenerPosted on 2009-07-27 at 06:05:10ID: 24951063

I don't think there's any need for IAS; the ASA is capable of performing Kerberos authentication.

http://www.cisco.com/en/US/products/hw/vpndevc/ps2030/products_configuration_example09186a008060f261.shtml

 

by: stsonlinePosted on 2009-07-27 at 11:12:22ID: 24954261

To start setting up Client VPN (SSL or IPSec) you need the following info:
===============
1) Active Directory Server IP (for LDAP query)
2) Firewall user name and password in AD (for firewall to be able to query LDAP)
3) Output for the "dsquery user -samid <firewall username>" command on your AD server.
4) IP address for VPN pool
5) Output for the "dsquery user -samid <example vpn username>" command (use to set up VPN users)
6) DNS Servers IP addresses
7) What internal networks/resources your VPN clients will be allowed to access?
====================

Set up an AAA server of type LDAP, configure the server using the AD/LDAP info obtained earlier. Create a group-policy, tunnel-policy, and domain user (on AD server) for LDAP to FW binding. Here's a sample using dummy data:

ldap attribute-map LDAP.To.Group.Policy.Map
map-name memberOf IETF-Radius-Class
map-value memberOf CN="VPN Users,OU=company,DC=ad_domain,DC=ofc" ADVPN_RA

aaa-server LDAP-SRV-GRP protocol ldap

aaa-server LDAP-SRV-GRP (inside) host 10.12.13.14
ldap-base-dn cn=Users, dc=ad_domain, dc=local
ldap-scope subtree
ldap-naming-attribute sAMAccountName
ldap-login-password abc123
ldap-login-dn cn=authproxy, cn=Users, dc=ad_domain, dc=local
server-type microsoft
ldap-attribute-map LDAP.To.Group.Policy.Map

group-policy No.VPN.Access-GP internal

group-policy No.VPN.Access-GP attributes
vpn-simultaneous-logins 0

group-policy ADVPN_RA attributes
vpn-simultaneous-logins 3

tunnel-group ADVPN_RA general-attributes
authentication-server-group LDAP-SRV-GRP
default-group-policy No.VPN.Access-GP

tunnel-group ADVPN_RA ipsec-attributes
pre-shared-key ***



 

by: stsonlinePosted on 2009-07-27 at 11:14:50ID: 24954290

Here's a link showing how to setup the firewall as well as a brief detail of the server setup.

http://www.cisco.com/en/US/products/ps6120/products_configuration_example09186a00808d1a7c.shtml

 

by: huntleyjPosted on 2009-08-19 at 17:24:11ID: 25138496

 

by: bradibutlerPosted on 2009-08-24 at 18:59:53ID: 25174081

Sorry to those who have replied. I've been out of town quite a bit and haven't had a chance to remedy the situation. I will attempt the possible solutions in the next 24 hours or so. Thanks again.

 

by: bradibutlerPosted on 2009-09-21 at 18:54:23ID: 31631720

Sorry it took so long but worked great! It takes some time to get through it but read it carefully and it'll get you through.

 

by: bradibutlerPosted on 2009-09-24 at 17:32:26ID: 25419297

Thanks!! You're getting me giant steps closer each time. This is what I'm getting now...*see code*

I checked the Remote Access Policy I created and Grant Remote Access is enabled. ???

User bbutler was denied access.
 Fully-Qualified-User-Name = companydomain/Users/Brad Butler
 NAS-IP-Address = 192.168.1.1
 NAS-Identifier = <not present> 
 Called-Station-Identifier = OUTSIDE.PUBLIC.IP
 Calling-Station-Identifier = MY.HOME.IP
 Client-Friendly-Name = MWASA
 Client-IP-Address = 192.168.1.1
 NAS-Port-Type = Virtual
 NAS-Port = 434176
 Proxy-Policy-Name = Use Windows authentication for all users
 Authentication-Provider = Windows 
 Authentication-Server = <undetermined> 
 Policy-Name = Connections to other access servers
 Authentication-Type = PAP
 EAP-Type = <undetermined> 
 Reason-Code = 65
 Reason = The connection attempt failed because remote access permission for the user account was denied. To allow remote access, enable remote access permission for the user account, or, if the user account specifies that access is controlled through the matching remote access policy, enable remote access permission for that remote access policy. 
                                              
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by: huntleyjPosted on 2009-09-25 at 08:09:31ID: 25423789

In your Active directory, bring up the properites of your user account. Choose the "Dial In" tab and ensure Allow access is set there.

20120131-EE-VQP-002

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