Devise ignoring custom strategy

This is just plain weird.

I've got Rails 3 RC running with Devise installed. I've defined a custom strategy to try and use Kerberos for authentication.

module Devise
  module Strategies
    class Kerb < Devise::Strategies::Base
      def valid?
        params[:username] || params[:password]
      end

      def authenticate!
        # cheap debugging
        puts "PARAMS: #{params}"

        if check_kerb_auth(params[:username], params[:password])
          # create user account if none exists
          u = User.find(:first, :conditions => { :username => params[:username] }) || User.create({ :username => login })
          success!(u)
        else
          fail!("Could not log in")
        end
      end

      def check_kerb_auth(username, password)
        require 'krb5_auth'
        include Krb5Auth

        return false if username.blank? or password.blank?

        begin
            kerberos = Krb5.new
            return kerberos.get_init_creds_password(username, password)
        rescue Krb5Auth::Krb5::Exception
            return false
        end
      end
    end
  end
end

I have the Devise Warden configuration setup as follows:

config.warden do |manager|
  manager.strategies.add(:kerb, Devise::Strategies::Kerb)
  manager.default_strategies :kerb
end

I get no errors in my log. Everything seems to work ok. If I add "cheap debugging" aka a bunch of puts statements, it seems to reflect that the :kerb strategy is the default. Here is a sample set of logs from a login attempt:

=> Booting WEBrick
=> Rails 3.0.0.rc application starting in development on http://0.0.0.0:3000
=> Call with -d to detach
=> Ctrl-C to shutdown server
[2010-08-17 10:50:35] INFO  WEBrick 1.3.1
[2010-08-17 10:50:35] INFO  ruby 1.8.7 (2010-01-10) [x86_64-linux]
[2010-08-17 10:50:40] INFO  WEBrick::HTTPServer#start: pid=12717 port=3000


Started POST "/users/login" for 127.0.0.1 at Tue Aug 17 10:50:43 -0400 2010
  Processing by Devise::SessionsController#create as HTML
  Parameters: {"commit"=>"Login", "authenticity_token"=>"afZF6ho96p47dc9LQFwwNN5PqnRpl7x+1J7V3MiKgTE=", "_snowman"=>"\342\230\203", "user"=>{"remember_me"=>"1", "username"=>"hernan43", "password"=>"[FILTERED]"}}
Completed   in 0ms
  Processing by Devise::SessionsController#new as HTML
  Parameters: {"commit"=>"Login", "authenticity_token"=>"afZF6ho96p47dc9LQFwwNN5PqnRpl7x+1J7V3MiKgTE=", "_snowman"=>"\342\230\203", "user"=>{"remember_me"=>"1", "username"=>"hernan43", "password"=>"[FILTERED]"}}
Rendered devise/shared/_links.erb (1.2ms)
Rendered devise/sessions/new.html.erb within layouts/application (8.2ms)
Completed 200 OK in 124ms (Views: 11.7ms | ActiveRecord: 1.3ms)

The kerberos code works in other things on the same machine. I was sort of expecting it to show a bunch of errors if there was a problem but I am getting nothing. Is there a good way to debug Devise/Warden?

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Devise ignoring custom strategy

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