From: dac.override@gmail.com (Dominick Grift) Date: Fri, 21 Apr 2017 15:42:01 +0200 Subject: [refpolicy] [PATCH] login related stuff take 2 In-Reply-To: <81B0E11D-B5E5-41C6-BFF8-91699B40E271@trentalancia.net> References: <20170421091025.kwn5wmevhmoyidj3@athena.coker.com.au> <201704212238.06684.russell@coker.com.au> <20170421124246.GA2335@julius> <20170421124848.GB2335@julius> <81B0E11D-B5E5-41C6-BFF8-91699B40E271@trentalancia.net> Message-ID: <20170421134201.GC2335@julius> To: refpolicy@oss.tresys.com List-Id: refpolicy.oss.tresys.com On Fri, Apr 21, 2017 at 03:33:50PM +0200, Guido Trentalancia via refpolicy wrote: > It doesn't have a PAM configuration file for the simple reason that it doesn't use PAM... And thus it is not a authlogin login program > > I am now testing the other permissions, it should be easier and safer than just speculating on the possible behavior. > > I getting a very different behavior! > > Will get back shortly. > > Regards, > > Guido > > On the 21st April 2017 14:48:48 CEST, Dominick Grift via refpolicy wrote: > >On Fri, Apr 21, 2017 at 02:42:46PM +0200, Dominick Grift wrote: > >> On Fri, Apr 21, 2017 at 10:38:06PM +1000, Russell Coker via refpolicy > >wrote: > >> > On Fri, 21 Apr 2017 10:06:29 PM Guido Trentalancia via refpolicy > >wrote: > >> > > > auth_read_shadow(sulogin_t) > >> > > > > >> > > >+auth_login_pgm_domain(sulogin_t) > >> > > >+kernel_read_crypto_sysctls(sulogin_t) > >> > > >+selinux_set_generic_booleans(sulogin_t) > >> > > > > >> > > >What usage need this access? > >> > > > >> > > They are dangerous permissions, especially the one that allows to > >set the > >> > > SELinux booleans! > >> > > > >> > > Only the system administrator should be permitted to set the > >booleans > >> > > interactively through the application... > >> > > >> > Sulogin only runs at the console when something goes wrong in the > >early boot > >> > process, and the first thing it does is ask for a root password. > >> > > >> > It's simply impossible for sulogin to do what it does without the > >first line, > >> > it is a login program. > >> > >> I don't think its a login program from an authlogin perspective. It > >has no pam config here on fedora. There are no default contexts for > >sulogin > > > >Ok i might be wrong here with regard there not being default contexts. > >I do believe that it somehow uses default contexts but there does not > >seem to be a pam config here > > > >> > >> > > >> > The second is used by exim_t, lpr_t, boinc_t, mailman_cgi_t, and > >> > user_mail_domain among others. If we need to restrict access to > >that then > >> > exim_t, lpr_t, boinc_t, mailman_cgi_t, and user_mail_domain all > >deal with > >> > untrusted data. The domains exim_t, boinc_t, and mailman_cgi_t are > >exposed to > >> > data from the Internet and have that access. > >> > > >> > The policy currently has sysadm_shell_domtrans(sulogin_t) which > >allows sulogin > >> > to execute "bash -c setsebool" or similar. So allowing it to set > >booleans > >> > directly doesn't really change much. > >> > > >> > There is simply no possibility to allow sulogin to do what it is > >intended to > >> > do without granting it access to destroy things (at least > >indirectly). If you > >> > don't want that then the only option is to remove sulogin. I guess > >you could > >> > submit a patch with a boolean to deny executing sulogin_exec_t for > >init if > >> > that's what you want. > >> > > >> > -- > >> > My Main Blog http://etbe.coker.com.au/ > >> > My Documents Blog http://doc.coker.com.au/ > >> > _______________________________________________ > >> > refpolicy mailing list > >> > refpolicy at oss.tresys.com > >> > http://oss.tresys.com/mailman/listinfo/refpolicy > >> > >> -- > >> Key fingerprint = 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02 > >> > >https://sks-keyservers.net/pks/lookup?op=get&search=0x3B6C5F1D2C7B6B02 > >> Dominick Grift > > _______________________________________________ > refpolicy mailing list > refpolicy at oss.tresys.com > http://oss.tresys.com/mailman/listinfo/refpolicy -- Key fingerprint = 5F4D 3CDB D3F8 3652 FBD8 02D5 3B6C 5F1D 2C7B 6B02 https://sks-keyservers.net/pks/lookup?op=get&search=0x3B6C5F1D2C7B6B02 Dominick Grift -------------- next part -------------- A non-text attachment was scrubbed... Name: not available Type: application/pgp-signature Size: 659 bytes Desc: not available Url : http://oss.tresys.com/pipermail/refpolicy/attachments/20170421/ca552e87/attachment.bin