Re: restricted guest domain accounts

[Tom <tom@lemuria.org>]

On Tue, Jan 22, 2002 at 02:28:51PM -0500, Stephen Smalley wrote:
> It seems like using SELinux on this system would be beneficial even
> without a special guest user domain.  The example policy provides a user_t
> domain for ordinary users that is already limited, e.g. even if such a
> user obtains superuser privileges, he cannot modify the system software,
> configuration files, or logs.  The issue is not what programs can be run
> by the user but what permissions are granted to domains that can be
> entered by the user.  You could strip the user_t domain down further if
> desired, but you need to consider whether you are really improving
> security by doing so.  With regard to system calls, SELinux doesn't
> interpose on system calls - it provides low-level controls over the actual
> kernel operations on kernel objects.

thanks - as I said, I still haven't understood all of it.

what I want is, essentially, a user that can do exactly two things: log
in, and connect out again, with a small set of tools (ssh and telnet,
currently). that's it. he shouldn't be able to run anything else on the
machine. no looking at the process table, no ping'ing, no starting
daemons, nothing.

I'm not so much troubled about the users obtaining root, as the users
using the machine for a purpose other than the one specified.

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