How do I restrict "su - root" access to a set of users but allow all users to su to each other?

Solution Verified - Updated -

Issue

  • Only certain team members should be able to "su" to root. All other users should be able to su to any other account apart from root.

  • Eg :-

    • user1 & user2 must be able to su to root.
    • All other users should not able to switch user to root but can su to each other (with passwords).

Environment

  • Red Hat Enterprise Linux 5
  • Red Hat Enterprise Linux 6
  • PAM (Pluggable authentication modules)

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