SSL with FORM fallback

I struggled for a while to get SSL authentication with FORM fallback to work on tomcat. Sounds like something which must have been already implemented by someone, right? The latter is also true. The following are implementation and usage articles on the tomcat wiki:

Implementation:

http://wiki.apache.org/tomcat/SSLWithFORMFallback6

Usage:

http://wiki.apache.org/tomcat/SSLWithFORMFallback

For the usage part, it should suffice to just comment out the auth-method in your web.xml login-config.