Cannot not open session

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Two questions:

1. I'm working with selinux in opensuse.  With selinux in enforcing mode, su is not working.  For example, suppose root tries to su to an unprivileged user.  I'm asked if I would like to enter a security context [N].  If I say no, it responds "su: cannot not open session:  Authentication failure".   With selinux in permissive mode, it works... and no avc messages are logged.   

Any idea what I have done wrong?

2.  When I try to su to an unprivileged user, and it asks if I would like to enter a security context, suppose I say yes.  It asks for a role, and I enter 'user_r'.  then it asks for a level.  What kind of answer does it expect here?  Nothing I've tried works....

Thanks!



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