Authorize master page to anonymous users

Question

I have a site using forms authentication in which I deny access to anonymous users in the web.config:

<authorization>
  <deny users="?" />
</authorization>

There are a few pages (registration page, error page) that I want to allow access to anonymous users so I have added exceptions for them:

<location path="Register.aspx">
    <system.web>
      <authorization>
        <allow users="*" />
      </authorization>
    </system.web>
  </location>
  <location path="UserMessage.aspx">
    <system.web>
      <authorization>
        <allow users="*" />
      </authorization>
    </system.web>
  </location>

These pages are set up to use my master page, but they are not displaying correctly. I think it is because my master page is being denied anonymous access? How can I allow anonymous access to the sharepoint master page these pages are using and its styles?

Answer 1

I allowed access to everything in my masterpage directory. I had tried this with a typo in the path so I thought it wasn't working when I posted:

<location path="_catalogs/masterpage">
    <system.web>
      <authorization>
        <allow users="*" />
      </authorization>
    </system.web>
  </location>

I also had to do similar entries for the associated images and style sheets.