Single-sign on with Kerberos authentication
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                 Key: DOCU-231
                 URL: http://jira.magnolia-cms.com/browse/DOCU-231
             Project: Documentation
          Issue Type: Task
      Security Level: Public
          Components: content
            Reporter: Antti Hietala
            Assignee: Antti Hietala


Describe how to do SSO with Kerberos authentication.

Jira tickets such as MGNLLDAP-11 give the following advice:

{quote}
When user credentials are sent to LDAP/AD server, they can be encrypted in the 
bind request and can't be seen across the network. You can configure the level 
of security using java.naming.security.authentication in a configuration file. 
These are the values supported by the default sun service provider:
* none
* simple (plain text)
* DIGEST-MD5
* EXTERNAL //not yet supported by the LDAP login module
* GSSAPI (Kerberos V5)
{quote}

You can implement Kerberos authentication by providing your own login callback 
and handlers. There are [examples of callbacks in 
SVN|http://svn.magnolia-cms.com/view/community/magnolia/branches/magnolia-4.4/magnolia-core/src/main/java/info/magnolia/cms/security/auth/callback/].

{quote}For URISecurity, NTLM (AD shared token - SSO) is a supported method and 
other implementations are possible (Kerberos TTS, Digest). Provide 
loginCallback and loginCallbackHandler to negotiate authentication with user 
(see login, logout and uriSecurity filters at 
Configuration:/server/filters).{quote}

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