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We have an ASP.NET application on IIS 7 that accepts authentication tokens from ADFS 2. We used Windows Identity Foundation in the application to do that.

On the same IIS, we have a WEBDAV enabled folder to which Microsoft Office users save files. This works fine on an intranet using Windows Authentication. This involves no application code at all.

We would now like to secure access to the WebDav folder using ADFS too. But since IIS handles WEBDAV, there is no application to which I can add the ADFS authentication.

Two questions:

  • How to setup WEBDAV on IIS for ADFS authentication?
  • Will Word and Excel 2007 handle the interaction with ADFS?
H. den Breejen
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1 Answers1

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Microsoft Office can do forms based authentication when accessing WebDav resources. To make this work, the server must implement the MS-OFBA protocol.

IIS does not natively have MS-OFBA authentication. It is, however, possible to add custom authentication to a WebDav enabled folder in IIS by putting a IHttpModule in the bin folder. This module can do any authentication required.

Through MS-OFBA, Office can display one or more html-forms for entry of credentials. I am currently working on a HttpModule that does two-factor authentication displaying two consecutive forms.

WebDav Authoring Rules can make the bin folder and its contents invisible to the WebDav client.

So, we ended up doing the required authentication without ADFS.

H. den Breejen
  • 113
  • 8