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Re: solaris tape dev permission stupidity
From: darren.moffat () UK Sun COM (Darren J Moffat - Enterprise Services OS Product Support Group)
Date: Thu, 22 Oct 1998 09:17:57 +0100


under solaris, scsi tape devices (/dev/rmt/*, which are linked to the
st () x,x:
devs in /devices) are created with the permissions bits set to 666. this
allows
a mallicious user with a login on your system to 'mt erase' the contents of
any
tape devices connected to your system.

solution:

this is a tough one. i'll let you figure it out yourself.

Instead of guessing shall I tell you the correct fix!

The correct and recommend fix is to run bsmconv to turn on device
allocation.  This sets all of the device files for removable media devices
such as tapes to 0000.  A user who then wants to use a tape should then:

        allocate st0
                insert tape into drive
        tar/ufs*/cpio/dd  whatever
                remove tape from drive
        dealloate st0

The same applies to audio and cd devices, though the audio devices
are better dealt with using /etc/logindevperm.


If you are concerned about security on Solaris you should always
run bsmconv to turn on auditing and device allocation and run ASET
to ensure other perms etc are sorted out.  I would recommend running
/usr/aset/aset -l high -p




--
Darren J Moffat



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