From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4A53725A.5050209@manicmethod.com> Date: Tue, 07 Jul 2009 12:05:46 -0400 From: Joshua Brindle MIME-Version: 1.0 To: Daniel J Walsh CC: SE Linux , Chad Sellers , Stephen Smalley Subject: Re: This patch add seusers support to SELinux References: <4A11A6EE.3070903@redhat.com> <4A3A4366.3010606@manicmethod.com> <4A3A45B0.4070803@manicmethod.com> <4A3A97B0.6030407@redhat.com> <4A3AA03E.4010208@manicmethod.com> <4A3B6110.8010308@redhat.com> <4A3BA9DC.2060406@manicmethod.com> <4A3BACE9.6000403@redhat.com> <4A4A2CE1.5060204@manicmethod.com> <4A4B5A27.9000704@redhat.com> <4A536ECD.3050103@manicmethod.com> In-Reply-To: <4A536ECD.3050103@manicmethod.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Sender: owner-selinux@tycho.nsa.gov List-Id: selinux@tycho.nsa.gov Joshua Brindle wrote: > Daniel J Walsh wrote: >> The interface is looking for something that looks like: >> >> *:staff_u:s0 >> or >> sshd:guest_u:s0 >> login:staff_u:so-s0:c0-c1023 >> xdm:user_u:so >> >> I don not currently intend this to be edited by a human, the goal was to >> allow tools like IPA or other scripting tools to populate these files. >> The library should return the content as it does, but libselinux or >> pam_selinux should deny login if the machine is in enforcing mode. The >> fact that it is giving you a bogus login is a bug in current SELinux. >>>>> >>>> The : separated list matches seusers and /etc/passwd so I think it >>>> makes >>>> sense. THe file should require all three fields, that is a bug. >>>> >>> > > Patch merged in libselinux 2.0.84. > Even though I merged this I'm a little concerned about how fragile it is. For example, I added: sshd:staff_u:SystemLow to /etc/selinux/targeted/logins/root and when I rebooted and logged in I was unconfined_u. The problem was that mcstrans hadn't been started. The fact that I can essentially get unconfined access by bringing mcstrans down somehow is _very_ concerning. Granted this only happens if you are using translated levels but I think that will be very common in practice (so that the IPA infrastructure doesn't need to know the label encodings of every system). This is badness waiting to happen :\ -- This message was distributed to subscribers of the selinux mailing list. If you no longer wish to subscribe, send mail to majordomo@tycho.nsa.gov with the words "unsubscribe selinux" without quotes as the message.