[refpolicy] [PATCH] login related stuff take 2

[dac.override@gmail.com (Dominick Grift)]

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

> 
> 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.
> 
> -- 
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Dominick Grift
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