Implementation Guide for protecting Juniper SSL VPN with BlackShield ID

Transcription

1 Implementation Guide for protecting Juniper SSL VPN with BlackShield ID

2 Copyright Copyright 2011, CRYPTOCard All Rights Reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language in any form or by any means without the written permission of CRYPTOCard. Trademarks BlackShield ID, BlackShield ID SBE and BlackShield ID Pro are either registered trademarks or trademarks of CRYPTOCard Inc. All other trademarks and registered trademarks are the property of their owners. Additional Information, Assistance, or Comments CRYPTOCard s technical support specialists can provide assistance when planning and implementing CRYPTOCard in your network. In addition to aiding in the selection of the appropriate authentication products, CRYPTOCard can suggest deployment procedures that provide a smooth, simple transition from existing access control systems and a satisfying experience for network users. We can also help you leverage your existing network equipment and systems to maximize your return on investment. CRYPTOCard works closely with channel partners to offer worldwide Technical Support services. If you purchased this product through a CRYPTOCard channel partner, please contact your partner directly for support needs. To contact CRYPTOCard directly: International Voice: North America Toll Free: support@cryptocard.com For information about obtaining a support contract, see our Support Web page at Related Documentation Refer to the Support & Downloads section of the CRYPTOCard website for additional documentation and interoperability guides: Publication History Date Changes Version January 26, 2009 Documented created 1.0 March 21, 2011 Updated with Filter-Id return attribute, and GrIDsure support 1.1

3 Table of Content Overview... 1 Applicability... 1 Assumptions... 2 Operation Configuration Configuring Juniper SSL VPN for Two Factor Authentication Testing CRYPTOCard Authentication Advanced Configuration Adding Filter-Id to a User Realm in Juniper SSL VPN Adding Filter-Id attribute to Remote Access Policy (Windows 2003) Creating new Network Policy with Filter-Id attribute (Windows 2008) Juniper SSL VPN and GrIDsure support Prerequisites Adding the BlackShield Self Service URL to the gridsure.js file Adding the CRYPTOCard GrIDsure enabled Sign-in page Assigning the CRYPTOCard GrIDsure enabled Sign-in page to a Sign-in Policy Login as a CRYPTOCard GrIDsure enabled user Optional - Enabled Challenge-response requests... 14

4 Overview By default Juniper SSL VPN logons requires that a user provide a correct user name and password to successfully logon. This document describes the steps necessary to augment this logon mechanism with strong authentication by adding a requirement to provide a one-time password generated by a CRYPTOCard token using the implementation instructions below. Applicability This integration guide is applicable to: Security Partner Information Security Partner Juniper Networks Product Name and Version SA 700 / 6.2R1 (build 13255) Protection Category SSL Remote Access CRYPTOCard Server Authentication Server RADIUS Server BlackShield ID Sever 2.4 or higher BlackShield ID Server 2.7 or higher (GrIDSure support) Microsoft Internet Authentication Service (IAS) Microsoft Network Policy Server (NPS) Juniper Steel Belted RADIUS server 1

5 Assumptions 1. BlackShield ID has been installed and configured. 2. BlackShield ID NPS IAS Agent has been installed and configured on the NPS IAS Server to accept Radius authentication from the Juniper SSL VPN. 3. Ensure that Ports 1812 UDP and 1813 UDP are open to the NPS / IAS Server 4. The NPS IAS Agent must be configured to use either port 80 or port 443 to send authentication requests to the BlackShield ID server. 5. Create or define a Test account that will be used to verify that the Juniper SSL VPN has been properly configured. Ensure that the user name for this account exists in BlackShield ID by locating it in the Assignment Tab. 6. Verify that the Test user account can successfully authenticate with a static password, to the Juniper SSL VPN before attempting to apply changes and test authentication using a token. 7. A Test user account has been created and assigned with a CRYPTOCard token. Operation This document provides step by step instruction on how to configure the Juniper SSL VPN to send Radius authentication to an external Radius Server. 2

6 1. Configuration 1.1. Configuring Juniper SSL VPN for Two Factor Authentication Log into the Juniper SSL VPN Admin web portal. To add a new Radius Server, click on Auth Servers From the dropdown box, and select "Radius Server" Then click on the "New Server..." button Enter in a Name of the New Radius Server Enter in the IP address or DNS name of the Primary BlackShield ID Radius Server into the Radius Server field Enter in a Shared Secret into the Shared Secret field Place a checkmark in the Users authenticate using tokens and one-time passwords checkbox. Click Save Changes when completed. Optional: If there is a Secondary BlackShield ID Radius Server, please fill in all fields within the Backup Server section. NOTE: If the Juniper SSL VPN has other realms created, then please skip the rest of this section and go to Advanced Configuration section. 3

7 After the New Radius Server has been created, the Radius Server need to be applied to a User Realm. On the left hand side, select User Realms Select Users Then select General Under the Servers section, there will three down fields. They are: Authentication Directory/Attribute Accounting Change them Authentication and Accounting to use the new Radius Server was just created. Change Directory/Attribute to use Same as above Click Save Changes when completed. Next is to check the Sign-in Policies section to ensure that the default User URL is set to allow all User Realms to authenticate. Ensure that the Authentication Realm(s) section has say ALL. This means that any User Realms created within the Juniper SSL VPN can authenticate to this User URL. 4

8 1.2. Testing CRYPTOCard Authentication Next step is to test authentication against BlackShield ID via RADIUS with the newly configured Juniper SSL VPN web login portal. Open up a web browser and go to: Enter in a username and the One Time Password from a CRYPTOCard Token. Click Sign In. If the authentication is successful, the user will see the following screen. 5

9 2. Advanced Configuration After configuring the Juniper SSL VPN for Radius authentication, the Juniper device may have issues applying the proper User Realm to the user that is authenticating. This is due to the RADIUS Server returns an access-accept, but the Juniper SSL VPN does not know which role to map to that user. To resolve this issue, a RADIUS Return Attribute of Filter-Id is added to the role mapping Adding Filter-Id to a User Realm in Juniper SSL VPN Log into the Juniper SSL VPN Administrative web portal Go down to the Users section Highlight User Realms Then highlight the User Realm where the Filter- Id attribute will be added Finally click on Role Mapping Under the Role Mapping tab, click on the New Rule button. In the new Role Mapping Rule webpage please perform the following: Under the rule based on:, click the dropdown menu and select User attribute Then click the Update button Under the Attribute: section, click the dropdown menu and select Filter-Id (11) In the textbox below, type in a name for the Filter-Id (eg. Information Technology) Under the then assign these roles, select the Role (s) that will be assigned users after a successful authentication and the correct Filter- Id has been returned to the Juniper SSL VPN device. Click Save Changes when finished. 6

10 Next, check the Sign-in Policies section to ensure that the default User URL is set to use the User Realm that has the Filter-Id added as a Role Mapping. Ensure that the Authentication Realm(s) section has only the correct User Realm displayed. This means that that User Realms created within the Juniper SSL VPN can authenticate to this User URL Adding Filter-Id attribute to Remote Access Policy (Windows 2003) This is section is specifically for adding a Filter-Id attribute to a Remote Access Policy within Windows 2003 Internet Authentication Service (IAS). To add a new Network Policy with a Filter-Id in Microsoft Network Policy Server, on Windows 2008, please see the next section Open up Microsoft Internet Authentication Service (2003) Select Remote Access Policies Right click Authenticate to BlackShield, and select Properties 7

11 Perform the following Authenticate to BlackShield Properties popup: NAS-Port-Type matches Ethernet Click the Remove button, then click the Add button Select Day-And-Time-Restrictions, and click Add Select the Permitted radio button Click OK, and then Apply In the Authenticate to BlackShield Properties popup, click Edit Profile In the Edit Dial-in Profile popup, click the Advanced tab. Click the Add button Select the Filter-Id, and then click Add In the new pop up, click the Add button Another pop up appears. Enter in the Filter-Id value that was entered in section Click OK when finished, OK again, then click Close 8

12 The Advanced tab will now display the new Filter-Id that has been added to this Remote Access Policy. Click OK, and then OK again when finished. Expand Connection Request Processing in IAS Select Connection Request Policies Right click on the Policy that was created for BlackShield, and select Properties In the Authentication tab, select the Authenticate requests on this server radio button Click OK when finished. After all changes have been made, open up Windows Services, and restart Internet Authentication Service. 9

13 Creating new Network Policy with Filter-Id attribute (Windows 2008) This is section is specifically for adding a new Network Policy along with a Filter-Id attribute to Network Policy within Windows 2008 Network Policy Server (NPS). To add a Filter-Id attribute to a Remote Access Policy in Microsoft Internet Authentication Service on Windows 2003, please see the next section Open up Microsoft Network Policy Server (2008) Expand Policies Select Network Policies Right click Network Policies and select New Enter in a name for the new Network Policy under the Policy name field Ensure Type of network access server is set to Unspecified Click Next to continue Click the Add button to add a new condition Scroll down and select Day and Time Restrictions, and Click Add Select the Permitted radio button, and then Click OK Click Next to continue Select the Access granted radio button Click the Next button three times 10

14 Click the Add button to add a new attribute Select Filter-Id, and click Add Click the Add button, then enter in the Filter- Id value that was entered in section Click OK, then OK again Click the Close button Click Next Then click Finish to create the New Network Policy Select Connection Request Policies in NPS Right click on the Policy that was created for BlackShield, and select Properties Select the Settings tab Then select Authentication on the left hand side On the right hand side, select the Authenticate requests on this server radio button Click OK when finished After all changes have been made, open up Windows Services, and restart Network Policy Server 11

15 3. Juniper SSL VPN and GrIDsure support The Juniper SSL VPN login page can be configured to authenticate hardware and GrIDsure token users. 1. The user enters the Juniper SSL VPN URL into their web browser. 2. The Juniper SSL VPN login page displays a Username and OTP field as well as a Login and Get GrID button. 3. The user enters their username into the Username field then selects Get Grid. The request is submitted from the user s web browser to the BlackShield Self Service site. 4. The BlackShield Self Service site displays the user s GrIDsure Grid within the Juniper SSL VPN login page. 5. The user enters their GrIDsure password into the OTP field then submits the request. 6. The Juniper SSL VPN device performs a RADIUS authentication request against the BlackShield server. If the CRYPTOCard credentials entered are valid, the user is presented with their Juniper SSL VPN portal otherwise, the attempt is rejected. 12

16 3.1. Prerequisites 1. The Juniper SSL VPN device must support uploading custom login pages (Juniper SSL VPN model SA 2500 or higher). 2. The BlackShield Self Service Site must be publicly accessible to SSL VPN clients. 3. The Juniper device must already be configured to perform RADIUS authentication against the BlackShield server Adding the BlackShield Self Service URL to the gridsure.js file 1. Open gridsure.js with a text editor. 2. Change the value of gridmakerurl to reflect the location of your BlackShield Self Service website then save the file. Example: var gridmakerurl = " Adding the CRYPTOCard GrIDsure enabled Sign-in page. 1. Login as an administrator to the Juniper device. 2. Select Authentication, Signing In, Sign-In Pages. 3. Select the "Upload Custom Pages" button. 4. In the "Sample Templates Files" section select "Sample". Download sample.zip to a temporary folder. 5. Rename the sample.zip file to cryptocard.zip. 6. Add the gridsure.js and LoginPage.thtml file to cryptocard.zip (if prompted, overwrite the existing LoginPage.thtml file). 7. In "Upload Custom Sign-In Pages", enter "CRYPTOCard GrID Enabled" into the Name field and in "Page Type" select "Access". In "Templates File" browse to the cryptocard.zip file then select the "Upload Custom Pages" button Assigning the CRYPTOCard GrIDsure enabled Sign-in page to a Sign-in Policy. 1. Login as an administrator to the Juniper device. 2. Select Authentication, Signing In, Sign-In Policies. 3. Select the CRYPTOCard authentication enabled "User URL". 4. In the Sign-in page section, select "CRYPTOCard GrID Enabled" then save the settings. 13

17 3.5. Login as a CRYPTOCard GrIDsure enabled user. 1. Open a web browser and browse to the CRYPTOCard enabled Juniper SSL VPN sign-in page. 2. Enter the username then select the "Get Grid" button, a grid will appear in the screen. 3. Enter the PIP into the password field then select Sign-in Optional - Enabled Challenge-response requests 1. Login as an administrator to the Juniper device. 2. Select Authentication, Auth. Servers. 3. Select the CRYPTOCard RADIUS enabled authentication server. 4. In "Custom Radius Rules" select "New Radius Rule...". 5. In "Display Name" enter "Display challenges", set "Response Packet Type" to "Access Challenge". In "Attribute criteria" set "Radius Attribute" to "Reply-Message(18) with a "Value" of "*". In "Then take action..." select "show Generic Login page". 6. Save the changes. 14