You will need to write your own code to perform the authentication against the directory. I have done this in the past using the C LDAP API wrapped in a C++ COM object. The LDAP server was a Lotus notes server of which I actually know very little. I tried to migrate the code to .NET but the server was not configured to LDAP standard so would fail (never worked out why the C LDAP API implementation would work but the ADSI implementation would not).
Basically you will need to use the System.DirectoryServices namespace [1] using the LDAP provider. In the C LDAP API the process was:
1. Perform an anonymous bind to the server 2. Search the directory (in my case, using the cn attribute) 3. If the entry is found, attempt an authenticated bind to the directory (in my case, using the cn and password)
Sorry I can't really help with the .NET side of things, but I seem to remember the DirectoryServices namespace was quite self explanatory. IIRC, its just a managed wrapper onto ADSI.
You would be able to use forms authentication since at its most basic your authentication method will just accept a username and password and return a bool indicating the result, which is no different to storing a username and password in a database or elsewhere.
Hopefully someone else on this list will be more helpful!
KH
[1] http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemDirectoryServices.asp
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