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There are three tabs in the module administration for the shib_auth module: General Settings, Group Rules and Advanced Settings. Here is an example screen shot of the three tabs. Click on the image to enlarge it.
Here is an example of the General Settings tab for the authentication module when used at MIT. Click on the image to enlarge it. 
A typical attribute settings section (from the General Tab) is shown below. Click on the image to enlarge it.
The entries in the screen shot above assume that you have used the MIT shell script to configure your shibboleth.xml file. You should check your xml file. Within the "Applications" section, look for the SessionInitiator section. You should have one SessionInitiator that is defined as:
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Group rules allow you to automatically map Touchstone-authenticated users to specific Drupal roles, based on values in SAML attributes. One common attribute we use here is "affiliation". Here is an example of configuring the Group Rules when using Drupal 6. Click on the image to enlarge it.
