DIGIPASS Authentication for Cisco ASA 5500 Series

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2 Disclaimer Disclaimer of Warranties and Limitations of Liabilities This Report is provided on an 'as is' basis, without any other warranties, or conditions. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of VASCO Data Security. Trademarks DIGIPASS & VACMAN are registered trademarks of VASCO Data Security. All trademarks or trade names are the property of their respective owners. VASCO reserves the right to make changes to specifications at any time and without notice. The information furnished by VASCO in this document is believed to be accurate and reliable. However, VASCO may not be held liable for its use, nor for infringement of patents or other rights of third parties resulting from its use. Copyright 2010 VASCO Data Security. All rights reserved VASCO Data Security. All rights reserved. Page 2 of 20

3 Table of Contents DIGIPASS Authentication for Cisco ASA 5500 Series... 1 Disclaimer... 2 Table of Contents Overview Problem Description Solution Web Access SSL/VPN tunnel Technical Concept General overview Cisco ASA prerequisites IDENTIKEY Server Prerequisites Cisco ASA configuration AAA Setup Connection Profile Save Changes IDENTIKEY Server Policy configuration Client configuration Cisco ASA SSL/VPN test Response Only Challenge / Response About VASCO Data Security VASCO Data Security. All rights reserved. Page 3 of 20

4 1 Overview The purpose of this document is to demonstrate how to use a Cisco ASA 55xx (ASA) in combination with a DIGIPASS. We will show you how to import a DPX file, how to assign a DIGIPASS to a user and show some administrative options. 2 Problem Description The basic working of the ASA is based on authentication to an existing media (LDAP, Radius, local authentication ). To use the IDENTIKEY Server with the ASA, the authentication settings need to be changed. 3 Solution After configuring IDENTIKEY Server and the ASA in the right way, you eliminate the weakest link in any security infrastructure the use of static passwords that are easily stolen guessed, reused or shared. The ASA can serve 2 access modes to a user, Web Access and a SSL Tunnel. We can compare these modes like a firewall, the portal acts as a general rule to deny all traffic and specify which connections are allowed, the SSL/VPN tunnel allows all traffic, so you have to specify what kind of connections you want to deny. 3.1 Web Access Allows users to gain access to their (web-) applications from any location. The web servers remain safely hidden behind the firewall and are not publicly reachable. Administrators have the advantage to deploy granular access control on a user or group basis. For this solution the user only needs a browser on their local client. Figure 1: Web portal 2010 VASCO Data Security. All rights reserved. Page 4 of 20

5 3.2 SSL/VPN tunnel Users have the ability to run their corporate client/server application from any location. Access can be filtered on Port, IP or IP range, giving administrators the ability to control application access on a user or group basis. Figure 2: SSL Tunnel 2010 VASCO Data Security. All rights reserved. Page 5 of 20

6 4 Technical Concept 4.1 General overview The main goal of the ASA is to perform authentication to secure all kind of VPN and firewall connections. As the ASA can perform authentication to an external service using the RADIUS protocol, we will place the IDENTIKEY Server as back-end service, to secure the authentication with our proven IDENTIKEY Server software. 4.2 Cisco ASA prerequisites Please make sure you have a working setup of a Cisco ASA device. It is very important this is working correctly before you start implementing the authentication to the IDENTIKEY Server. At this time this is a list of devices supported: Cisco ASA 5505 Cisco ASA 5510 Cisco ASA 5520 Cisco ASA 5540 Cisco ASA 5550 Cisco ASA Cisco ASA The screenshots used in the rest of this document, are taken from a Cisco ASA 5505 in combination with ASDM version IDENTIKEY Server Prerequisites In this guide we assume you already have IDENTIKEY Server installed and working. If this is not the case, make sure you get it working before installing any other features VASCO Data Security. All rights reserved. Page 6 of 20

7 5 Cisco ASA configuration 5.1 AAA Setup The first changes you need to make, is adding the IDENTIKEY Server in the list as a new AAA Server Group. Go to AAA Setup > AAA Server Groups in the configuration part of the Cisco ASDM configuration utility. Click on the Add button on the right of the top window. Figure 3: AAA Setup (1) Fill in the Server Group name and select RADIUS as the protocol. Leave the rest of the settings as default. Figure 4: AAA Setup (2) 2007 VASCO Data Security. All rights reserved. Page 7 of 20

8 Select your newly create group in the top window and click the Add button in the right of the lower window. This way you can add a new AAA Server to your Group. Figure 5: AAA Setup (3) The Interface name has to be the location where your IDENTIKEY Server is residing. If this is in your LAN choose Inside, if this is located on another subnet, LAN or internet choose Outside. Also specify the IP or Name in the field below. Leave timeout default and change the authentication and accounting port to The server secret key will contain the shared secret for the RADIUS connection. Click OK when all fields are filled in correctly. Figure 6: AAA Setup (4) 2007 VASCO Data Security. All rights reserved. Page 8 of 20

9 5.2 Connection Profile We now change the Connection Profile to make use of our newly create AAA server. Go to Clientless SSL VPN Access > Connection Profiles and select the current connection profile where you want to change the authentication profile. Click Edit to change the details. Figure 7: Connection Profile (1) Select your new AAA Server Group and click OK. Figure 8: Connection Profile (2) 2007 VASCO Data Security. All rights reserved. Page 9 of 20

10 You may see we also changed the Group Policy, but this was only for cosmetically reasons. This has no effect on the authentication part. To make the changes current, click the Apply button in the bottom of the screen. Figure 9: Connection Profile (3) 2007 VASCO Data Security. All rights reserved. Page 10 of 20

11 5.3 Save Changes To save the changes on the flash memory, click the Save button in the toolbar. Figure 10: Save Changes (1) Confirm the message (Apply) to save the running config to the flash memory. Figure 11: Save Changes (2) The running config will be saved. Figure 12: Save Changes (3) We now showed you how to set-up a RADIUS connection to IDENTIKEY Server but we still need to configure the IDENTIKEY Server and enable users in the database VASCO Data Security. All rights reserved. Page 11 of 20

12 6 IDENTIKEY Server Go to the IDENTIKEY Server web administration page, and authenticate with and administrative account. 6.1 Policy configuration To add a new policy, select Policies Create. Figure 13: Policy configuration (1) There are some policies available by default. You can also create new policies to suit your needs. Those can be independent policies or inherit their settings from default or other policies VASCO Data Security. All rights reserved. Page 12 of 20

13 Fill in a policy ID and description. Choose the option most suitable in your situation. If you want the policy to inherit setting from another policy, choose the right policy in the Inherits From list. Otherwise leave this field to None. Figure 14: Policy configuration (2) In the policy options configure it to use the right back-end server. This could be the local database, but also active directory or another radius server. This is probably the same that was in your default client authentication options before you changed it. Or you use the local database, Windows or you go further to another radius server. In our example we select our newly made Demo Policy and change it like this: Local auth.: Digipass/Password Back-End Auth.: Default (None) Back-End Protocol: Default (None) Dynamic User Registration: Default (No) Password Autolearn: Default (No) Stored Password Proxy: Default (No) Windows Group Check: Default (No Check) After configuring this Policy, the authentication will happen locally in the IDENTIKEY Server. So user credentials are passed through to the IDENTIKEY Server, it will check these credentials to its local user database and will answer to the client with an Access-Accept or Access-Reject message VASCO Data Security. All rights reserved. Page 13 of 20

14 In the Policy tab, click the Edit button, and change the Local Authentication to Digipass/Password. Figure 15: Policy configuration (3) The user details can keep their default settings. Figure 16: Policy configuration (4) 2007 VASCO Data Security. All rights reserved. Page 14 of 20

15 6.2 Client configuration Now create a new component by right-clicking the Components and choose New Component. Figure 17: Client configuration (1) 2007 VASCO Data Security. All rights reserved. Page 15 of 20

16 As component type choose RADIUS Client. The location is the IP address of the client. In the policy field you should find your newly created policy. Fill in the shared secret you entered also in the client for the RADIUS options. In our example this was vasco. Click Create. Figure 18: Client configuration (2) Now the client and the IDENTIKEY Server are set up. We will now see if the configuration is working VASCO Data Security. All rights reserved. Page 16 of 20

17 7 Cisco ASA SSL/VPN test 7.1 Response Only To start the test, browse to the public IP address or hostname of the ASA device. In our example this is Enter a Username and a One Time Password (OTP) and click the Login button. Figure 19: Response Only (1) If all goes well, you will be authenticated and see the SSL/VPN portal page. Figure 20: Response Only (2) 2007 VASCO Data Security. All rights reserved. Page 17 of 20

18 7.2 Challenge / Response For the challenge response test, enter a Username and a Password (challenge/response trigger). Click the Login button. In our case the challenge/response trigger is the user s static password. Figure 21: Challenge / Response (1) You will be presented with a DP300 Challenge code. Enter the response in the Answer field and click OK. Figure 22: Challenge / Response (2) 2007 VASCO Data Security. All rights reserved. Page 18 of 20

20 8 About VASCO Data Security VASCO designs, develops, markets and supports patented Strong User Authentication products for e-business and e-commerce. VASCO s User Authentication software is carried by the end user on its DIGIPASS products which are small calculator hardware devices, or in a software format on mobile phones, other portable devices, and PC s. At the server side, VASCO s VACMAN products guarantee that only the designated DIGIPASS user gets access to the application. VASCO s target markets are the applications and their several hundred million users that utilize fixed password as security. VASCO s time-based system generates a one-time password that changes with every use, and is virtually impossible to hack or break. VASCO designs, develops, markets and supports patented user authentication products for the financial world, remote access, e-business and e-commerce. VASCO s user authentication software is delivered via its DIGIPASS hardware and software security products. With over 25 million DIGIPASS products sold and delivered, VASCO has established itself as a world-leader for strong User Authentication with over 500 international financial institutions and almost 3000 blue-chip corporations and governments located in more than 100 countries VASCO Data Security. All rights reserved. Page 20 of 20