On Mon, Jan 22, 2018 at 3:20 PM, Simo Sorce <simo@redhat.com> wrote:
On Mon, 2018-01-22 at 15:10 +0100, Fabiano FidĂȘncio wrote:
> People,
>
> Let's start with the context of this email:
> https://bugzilla.redhat.com/show_bug.cgi?id=1536854
> So, seems that even without knowing that, I've relied on CAP_DAC_OVERRIDE
> in order to have the Fleet Commander integration working as expected and in
> the implementation details of this feature.
>
> The desktop profiles are stored in a dir like:
> /var/lib/sss/deskprofile/$domain/$user/$profile.
>
> Currently, the way I've been creating those are:
> $domain = 755 (root:root)
> $user = 600 ($user:$user_group)
> $profile = 600 ($user:$user_group)
>
> Now, as mentioned in the bugzilla linked in this email, the current code
> fails with an EACCES.
>
> With all this background, I'd like to discuss what's the best approach to
> take. I've opened a PR (https://github.com/SSSD/sssd/pull/498) which makes
> everything work again, but does the following changes:
>
> $domain = 755 (root:root) -- NO changes here
> $user = 770 ($user:root) --> changed from 600 ($user:$user_group)
> $profile = 660 ($user:root) --> changed from 600 ($user:$user_group)
>
> This is one way to solve the issue suggested at
> https://bugzilla.redhat.com/show_bug.cgi?id=1536854#c5.
>
> Another suggestion, also mentioned in the bugzilla, would be to only
> fchown()/fchmod() the files/dirs *after* all the operations we do are over.
>
> Is there any other suggestion? Whatever comes out of this discussion will
> be used to update the feature's design page accordingly.

Change euid to that of the user during operations, leave the
permissions strict ?

Does the other developers agree with Simo's proposal? If yes, I'll just update the DesignPage accordingly and provide the patches.
 

Simo.

--
Simo Sorce
Sr. Principal Software Engineer
Red Hat, Inc
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