Legacy Knowledge Base
Published Jul. 2, 2025

Replacing NTLM SSO with Kerberos in Liferay Portal 6.2

Written By

Jorge Diaz

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Issue

  • NTLM SSO protocol has some vulnerabilities addressed by Microsoft in CVE-2020-1472 (external link), forcing to use the secure RPC connection.
  • It's not possible to use a secure RPC connection in the Liferay NTLM SSO integration.
  • As an alternative, we want to replace the NTLM SSO with Kerberos.
  • Kerberos is not officially supported in Liferay Portal 6.2 and can't be configured because the Token-based SSO authentication settings don't exist in this version; they were added in DXP 7.0.
  • How can we configure Kerberos in this version?

Environment

  • Liferay Portal 6.2

Resolution

  • In Liferay Portal 6.2 it could be possible to configure Kerberos using the SiteMinder settings available in the Control Panel.
  • SiteMinder settings are very similar to the Token-Based SSO settings used in DXP 7.x to configure Kerberos.
  • So in Liferay Portal 6.2 you could try following the DXP documentation, Authenticating with Kerberos, but using the SiteMinder configuration section instead of the Token-Based SSO one.

Note: Liferay Portal 6.2 SiteMinder settings are more limited than the Token-Based SSO of DXP 7.x. For example, you can't configure the cookie name to invalidate during logout or specify a redirection URL to use after logout. If you need these, you will have to implement them with a custom Autologin hook.

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