UsernamePassingModule

An HTTPModule for IIS to allow the username of the currently authenticated user to be passed to a downstream server when IIS is running as a reverse proxy of URL rewriter

Build

Clone the project, open in Visual Studio and build using the normal Visual Studio building process

Install

To install this module in II7 (in pipeline mode) or above:

1. Copy UsernamePassingModule.dll from output directory (debug/bin or release/bin) to the bin directory of the IIS site you're wanting to pass a username from
2. Add a Web.config, or update your existing Web.config in the root of your site, so it contains a system.WebServer element, containing a modules element, with an add entry for the UsernamePassingModule, similar to:

   <configuration>
      <system.webServer>
         <modules>
            <add name="Username" type="UsernamePassingModule.UsernamePassingModule"/>
         </modules>
      </system.webServer>
   </configuration>

Advanced Configuration

It is possible to pass additional parameters to this module using a custom config setion:

1. If your Web.xml does not already contain a configSections element then add one as a sub-element of the root configuration element of your Web.xml
2. Add a section element to this configSections element, with a parameter named name and with the value of usernamePassingModule, and with a second attributed named type and with a value of System.Configuration.NameValueSectionHandler
3. Add a usernamePassingModule element to the root configuration element
4. Add an add element as a child of the usernamePaddingModule element for each configuration element you want to pass, e.g. to configure the name used in the HTTP header add an add element with a paremeter named key and with the value of headerName, and a second parameter with the name value and the value set to the name you want the header sent under. This value must be valid for an HTTP header name: containing only Alphanumeric characters, potentially seperated by hyphens.

To setup the module to pass the username header under the name 'Authenticated-User', you Web.config needs to look similar to following:

   <configuration>
      <configSections>
         <section name="usernamePassingModule" type="System.Configuration.NameValueSectionHandler" />
      </configSections>

      <system.webServer>
         <modules>
            <add name="Username" type="UsernamePassingModule.UsernamePassingModule"/>
         </modules>
      </system.webServer>

      <usernamePassingModule>
         <add key="headerName" value="Authenticated-User"/>
      </usernamePassingModule>

   </configuration>