Lucas Ferreira wrote:
Hello,
I have a Microsoft IIS web server that uses integrated authentication:
WWW-Authenticate: Negotiate
WWW-Authenticate: NTLM
I would like to setup an Apache-based reverse proxy before this web site. I
have the proxy configured and working for non-authenticated requests, but
every request that requires authentication fails with a "401 Unauthorized"
message. If I remove the proxy, the authentication works fine.
So, is it possible to forward integrated authentication using an Apache
reverse proxy? If yes, where can I find documentation on this?
This may be a problem because NTLM authentication is really
connection-based (I mean not really per-request), and the connection
which the browser has with your proxy, is not the same as the connection
which the proxy sets up with the back-end server. For example, it would
be possible for the proxy to "pool" several client browser connections,
over a single connection to the back-end server, and that would not
allow NTLM to work properly.
In a bit more details : NTLM authentication requires multiple exchanges
between the authenticating server and the browser, and these exchanges
must happen in a certain ordered sequence, on the same HTTP connection.
So if two browsers (or even two windows in the same browser) each try to
authenticate to the back-end server, but the proxy multiplexes these
exchanges over a single connection to the back-end server, then from the
back-end (IIS) server point of view, the steps are seen as mixed-up (out
of sequence on that single connection), and it will not work properly.
In summary, I think you are doomed, but I am willing to be proven wrong,
as the subject is of interest to me also.
Another good place to ask may be the jCIFS list at > [email protected]
They are not Apache specialist there, but there are HTTP/NTLM
specialists lurking there.
Just be nice and ask your question in a general sense, not expecting
them to be specifically Apache proxy gurus.
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