Need help with a find on related HABTM relationship

I'm looking for some guidance here.  

I have:

User hasAndBelongsToMany Project

Schema:

Users.id

Users.name

...

Project hasAndBelongsToMany User

Schema:

Project.id

Project.name

...

My join table:

projects_users.user_id

projects_users.project_id

Site belongsTo Project

Site.id

Site.project_id

...

Users-Projects works OK, I can assign a user to one or many projects.

Sites-Projects works OK, I can assign a Site to a Project.

Now, I want to make sure the user can only find sites that match the projects to which they are assigned.  I assume I need to put a condition into the Site's beforeFind function, but I can't figure it out.

Any guidance here?

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