Alfresco provides support for Single Sign-on (SSO) across the application, including Alfresco Explorer, Alfresco Share, and CIFS. There are a number of approaches which may be used, depending on the requirements.
Alfresco provides a generic HTTP Request Authentication Filter to support Single Sign-On services such as SiteMinder, IChains and many others. All those SSO solutions work by injecting an HTTP header that contains the User ID. To enable support simply locate the <ALFRESCO.WAR>/WEB-INF/web.xml file and replace the existing authentication filter: