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Web Single Sign-on

A Web access management (WebAM or WebSSO) system is middleware used to move the authentication and authorization of users out of individual web applications, to a shared platform.

A WebAM system intercepts initial contact by the user's web browser to a web application and either verifies that the user had already been authenticated (typically tracking authentication state in a cookie) or redirects the user to an authentication service, where the user may use a password, token, PKI certificate or other method to sign in.

Once a user is authenticated, the WebAM system connects the user to the application and passes identity data to the application, which need not authenticate the user itself. Some applications support direct injection of identities and require no password at all, but other applications require users to connect with a password, in which case the WebAM system must maintain a database of passwords for all users, injecting them on demand.

WebAM systems can also limit user access within applications, for example by filtering what URLs users can access or through closer integration with individual applications, which use a WebAM API to decide whether a user should be allowed to access a given function or not.

WebAM systems normally rely on an LDAP directory to identify and authenticate users.

WebAM systems are mainly designed to work with applications that cannot externalize identification, authentication or authorization using standards-based federation protocols.

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