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From "Christophe Dupriez" <>
Subject NTLM Authentication (POST now correctly supported)
Date Wed, 26 Nov 2008 21:50:09 GMT
Hi Tomcat Developers!

The new authenticator class (modified to support POST) is accessible:

The previous patch file is accessible and UNCHANGED:

Please let me know the procedures I may follow to make this modification perennial.

I wanted to:
* centralize the parameterization of user authentication at the container level;
* have a simple NTLM authentication for intranet users;
* be able to run Tomcat in a Microsoft Active Directory network where the server is secured
(absolutely no login allowed to regular users)

There is a Microsoft "specification" (bug?) by which all LDAP binds are evaluated on the Domain
Server (like if the user was attempting to login on the Domain Server).
It would be better to have binds evaluated as if they were originating from the LDAP client
machine (the Tomcat Server).

To circumvent this, I have been obliged to remove the binding (the password checking) but
to ensure that it is NTLM (and nothing else) which provides the username.
The users are therefore automatically logged with the username used to log on their PC.

The attached patch is for current Apache Tomcat sources (6.0.18).

It adds:
An NTLM Authenticator: nothing to configure except in the web.xml of each application:
The realm-name is the "password" which ensures that authentication is done by NTLM and no
other method.
A very long password is strongly recommended.
A modified JNDI Realm with new parameters: 
This to suppress password checking if preAuthenticatedPassword is provided. 
userIdentification="userPrincipalName" provides a standardized username, whatever the retrieved
user name (case of complex userSearch patterns) 
userNamePrefix and userNameSuffix
This to suppress a prefix and/or a suffix from username before returning it to the application:
good to suppress domain identification, etc.
When you user complex userSearch pattern, this can be very useful. Example:
userIdentification="userPrincipalName" userNamePrefix="domain\" userNameSuffix=""

Hopes this can be useful to the community!

Wishing you a very nice day,

Christophe Dupriez
Centre Antipoisons - Antigifcentrum
C/o Hôpital Central de la Base Reine Astrid
   Rue Bruyn - 1120 Bruxelles - Belgique
tel 32-(0) fax 32-(0)
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