Re: [PATCH] selinux-testsuite: Allow test domains to read /etc/passwd

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On Tue, 2012-09-18 at 12:32 -0400, Daniel J Walsh wrote:
> On 09/18/2012 09:45 AM, Stephen Smalley wrote:
> > On Sat, 2012-09-15 at 02:22 +0000, Serge E. Hallyn wrote:
> >> Quoting Daniel J Walsh (dwalsh@xxxxxxxxxx):
> >>> -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
> >>> 
> >>> On 09/13/2012 10:08 AM, Stephen Smalley wrote:
> >>>> Several test cases require the ability to read /etc/passwd to look
> >>>> up usernames.  Recent Fedora introduced a separate type on
> >>>> /etc/passwd and therefore we need to add an interface call to
> >>>> test_global.te.  Fixes three test failures on Fedora 17.
> >>>> 
> >>>> Signed-off-by: Stephen Smalley <sds@xxxxxxxxxxxxx> --- 
> >>>> policy/test_global.te | 2 ++ 1 file changed, 2 insertions(+)
> >>>> 
> >>>> diff --git a/policy/test_global.te b/policy/test_global.te index 
> >>>> 77121ae..fdfd291 100644 --- a/policy/test_global.te +++ 
> >>>> b/policy/test_global.te @@ -88,3 +88,5 @@ 
> >>>> selinux_compute_access_vector(testdomain) 
> >>>> selinux_compute_create_context(testdomain) 
> >>>> selinux_compute_relabel_context(testdomain) 
> >>>> selinux_compute_user_contexts(testdomain) +
> >>>> +auth_read_passwd(testdomain)
> >>>> 
> >>> Probably should use
> >>> 
> >>> auth_use_nsswitch(testdomain)
> >>> 
> >>> Since this will handle cases where users are listed in ldap or use
> >>> sssd.
> >> 
> >> Stephen, would you like that instead?
> > 
> > No, it doesn't work - you cannot pass an attribute name to that interface.
> > 
> 
> Ahh yes, you can not assign an attribute to an attribute.  That is right up
> there with no assigning an attribute within a boolean as my least liked things
> about our policy compiler.
> 
> 
> I guess you need to add auth_use_nsswitch() for each type that gets set to
> test_domain.

That would be rather painful.  For now, let's just use
auth_read_passwd(testdomain).  Works for me.

auth_use_nsswitch() might have undesirable side effects, like allowing
every test domain network access.  Which would then prevent testing
enforcement of the socket permission checks.

-- 
Stephen Smalley
National Security Agency


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