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Is there a module that will pass the authentication request off to a second Drupal site, ideally to an out-of-the-box services endpoint?

There are some similar questions about login integration with other systems, but I couldn't find a Drupal-to-Drupal question.

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Are you interested also to, for example, a Drupal site used as OpenID server? –  kiamlaluno Nov 27 '12 at 20:37
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CAS module does that but I am not sure about Drupal-Drupal authentication. –  2-Stroker Nov 28 '12 at 7:22
    
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2 Answers

Have you checked out the Multisite Login module? This allows sharing logins across different domains, and I've had luck with it. They also have a Drupal 7 version available in dev.

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Another option might be to set up whichever site you want to be responsible for authentication as an OpenID provider then on the other site enable OpenID (core module) for users to log in. You can set up the first site as an OpenID provider using this module:

I've never done this, but it should work in theory.

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