Selfmade policy not getting enforced on Fedora9
Daniel J Walsh
dwalsh at redhat.com
Wed May 28 18:44:39 UTC 2008
Stefan Schleifer wrote:
> Hey guys,
>
> As you might guess, I've a problem with my SELinux-policy under Fedora 9.
>
> I created a little test application 'demo' which reads some text from
> stdin and writes it in a config file /etc/hackbar/config.txt.
>
> Afterwarts, I developed a policy with types demo_t, demo_exec_t und
> demo_etc_t and allowed demo_exec_to to read/write demo_etc_t.
> Everything's fine.
>
> For testing purposes I changed /etc/hackbar/config.txt to type etc_t
> which demo_exec_t shouldn't be able to access as there doesn't exist an
> allow demo_exec_t r/w etc_t.
>
>
> [stefan at localhost policy]$ ls -Z /usr/local/bin/demo
> -rwsr-sr-x root root system_u:object_r:demo_exec_t:s0
> /usr/local/bin/demo
> [stefan at localhost policy]$ ls -Z /etc/hackbar/config.txt
> -rwxr-xr-x root root system_u:object_r:etc_t:s0
> /etc/hackbar/config.txt
>
>
> Again I ran the application but it is still allowed to change that file?!
>
>
> [stefan at localhost policy]$ /usr/local/bin/demo
> Enter text: foobar
> Read from file: foobar
>
>
> Regarding to standard UNIX permissions access should be granted as the
> demo-app has suid set, but shouldn't SELinux permitt access anyway in
> this case?
>
> SELinux is in enforcing mode.
>
>
> [stefan at localhost policy]$ /usr/sbin/sestatus
> SELinux status: enabled
> SELinuxfs mount: /selinux
> Current mode: enforcing
> Mode from config file: enforcing
> Policy version: 22
> Policy from config file: targeted
>
>
> I'm rather confused...
>
> best regards,
> Stefan
>
>
> ------------------------------------------------------------------------
>
> --
> fedora-selinux-list mailing list
> fedora-selinux-list at redhat.com
> https://www.redhat.com/mailman/listinfo/fedora-selinux-list
You need to define a transition rule from the domain that is executing
the demo application.
So if you are running as unconfined_t you will need a rule like
domtrans_pattern(unconfined_t, demo_exec_t, demo_t)
role unconfined_r types demo_t;
More information about the fedora-selinux-list
mailing list