You will have to write a custom code (not sure what's "a lot" for you).
The mapping of tables can be done manually. If the table structure for logins are close enough, you will get single-login/logout working fine.
If you are good with rails, this task should be easy enough. If you don't code in rails much, you'll have to hire someone or don't relay on this as BirdOPrey5 suggested.
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