From: dac.override@gmail.com (Dominick Grift) Date: Fri, 21 Apr 2017 14:48:48 +0200 Subject: [refpolicy] [PATCH] login related stuff take 2 In-Reply-To: <20170421124246.GA2335@julius> References: <20170421091025.kwn5wmevhmoyidj3@athena.coker.com.au> <201704212238.06684.russell@coker.com.au> <20170421124246.GA2335@julius> Message-ID: <20170421124848.GB2335@julius> To: refpolicy@oss.tresys.com List-Id: refpolicy.oss.tresys.com 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 -- 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/20170421/4012fd4c/attachment-0001.bin