selinux: rhel5 x fedora 14

[Paulo Cavalcanti]

On Wed, Jan 12, 2011 at 7:07 PM, Daniel J Walsh <dwalsh at redhat.com> wrote:

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> On 01/12/2011 04:03 PM, Paul Howarth wrote:
> > On Wed, 12 Jan 2011 13:02:21 -0500
> > Daniel J Walsh <dwalsh at redhat.com> wrote:
> >> On 01/12/2011 06:29 AM, Paulo Cavalcanti wrote:
> >>> Hi,
> >>>
> >>> I have two HDs on my computer: one with rhel5 5.5 and the other with
> >>> fedora 14.
> >>> Both systems share some directories located in a common /home,
> >>> mainly used by the httpd process.
> >>>
> >>> The problem is that selinux in fedora 14 uses "unrestricted_u" by
> >>> default for all users, which rel5 does not understand,
> >>> and any file labeled that way is treated as "unlabeled_t" in rhel5.
> >>>
> >>> I tried to relabel all files in Fedora 14 using "chcon -R -u user_u
> >>> -t user_home_t" , for instance,
> >>> but every new file is still created as "unrestricted_u".
> >>>
> >>> I know very little about selinux, and I would like to know how to
> >>> force all files in F14 to be user_u,
> >>> but keeping the user owning those files, unrestricted.
> >>>
> >>> Is that possible? Is there a better solution for not having tons of
> >>> denials in rhel5?
> >>>
> >>> Thanks.
> >>>
> >>> --
> >>> Paulo Roma Cavalcanti
> >>> LCG - UFRJ
> >>>
> >> One solution would be to mount with a context on one of the platforms.
> >>
> >> On RHEL5 mount the users homedir with a context of nfs_t, and set the
> >> boolean to say allow nfs homedirs
> >>
> >>
> >> mount -o context="system_u:object_r:nfs_t:s0" /dev/ABC /home
> >> setsebool -P use_nfs_home_dirs 1
> >
> > What happens with newly-created files whilst booted in RHEL-5 in this
> > case? What will Fedora 14 see them as?
> >
> > Paul.
>
> nfs_t, i think so Stephens solution is probably better?  I would hope in
> stephens solution they would be labeled user_home_t.  But it would
> probably be smart to run restorecon -R -v ~/ When you login on F14
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I would like to thank you all for the suggestions.

In rhel5, I changed my fstab this way:

LABEL=/home             /home                   ext4
defaults,context=user_u:object_r:user_home_t:s0        1 2


All the files labelled "unconfined_u:object_r:user_home_t:s0" in F14 are
seen
as "user_u:object_r:user_home_t:s0" in rhel5, and my /var/log/mesages is not
no longer
full of denials.

However, even allowing httpd to read user content on rhel5 (files labelled
user_home_t, I guess),
I still get some warnings from selinux troubleshooter. Does this flag really
work on rhel5?

Does anyone think that using nfs_t (and setsebool -P use_nfs_home_dirs 1)
would make any difference?
Also, does anyone know whether rhel6 will be more "Fedora like", from an
selinux point of view?

Cheers.

-- 
Paulo Roma Cavalcanti
LCG - UFRJ
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