Re: [RFC] Source Policy, CIL, and High Level Languages

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On 07/16/2014 10:21 AM, Stephen Smalley wrote:
> On 07/16/2014 10:16 AM, Stephen Smalley wrote:
>> On 07/15/2014 03:56 PM, Steve Lawrence wrote:
>>> On 07/14/2014 01:49 PM, Stephen Smalley wrote:
>>>> On 07/14/2014 01:12 PM, Steve Lawrence wrote:
>>>>> Ah, interesting. We saw that problem a long time ago, but couldn't
>>>>> reproduce it and it disappeared. Though I'm still unable to reproduce it
>>>>> following your steps. I can still login and seusers is labeled
>>>>> selinux_config_t. I'll keep looking into this.
>>>>>
>>>>> I've also rebased/pushed #integration onto #next.
>>>>
>>>> # Revert to stock F20 SELinux userspace and policy.
>>>> yum reinstall checkpolicy* libsepol* libsemanage* libselinux*
>>>> policycoreutils* selinux-policy-targeted
>>>>
>>>> # Clear prior source/CIL policy store.
>>>> rm -rf /var/lib/selinux
>>>>
>>>> # Reboot to ensure systemd and friends are using the new policy.
>>>> reboot
>>>>
>>>> # Reset selinux and cil to latest sources
>>>> cd selinux
>>>> git clean -fdx
>>>> git fetch origin
>>>> git reset --hard origin/integration
>>>> cd ../cil
>>>> git clean -fdx
>>>> git fetch origin
>>>> git reset --hard origin/master
>>>>
>>>> # Build and install new userspace
>>>> cd ..
>>>> ln -sf ../../cil selinux/libsepol/cil
>>>> make -C selinux LIBDIR=/usr/lib64 SHLIBDIR=/lib64 install install-pywrap
>>>> relabel
>>>>
>>>> # Convert
>>>>  ./selinux/libsemanage/utils/semanage_migrate_etc_to_var.py
>>>>
>>>> Try to login on console or via ssh:  Unable to get valid context for sds.
>>>>
>>>> dmesg | grep systemd
>>>> [  343.739985] systemd[1]: SELinux policy denies access.
>>>> [  348.256030] systemd[1]: SELinux policy denies access.
>>>> [  376.335248] systemd[1]: SELinux policy denies access.
>>>> [  376.515343] systemd[1]: SELinux policy denies access.
>>>>
>>>> restorecon -R /etc/selinux/targeted
>>>>
>>>> Try to login again, hangs for a long time before finally succeeding.
>>>>
>>>> reboot
>>>>
>>>> Everything is happy.
>>>>
>>>> 100% reproducible, every time.
>>>>
>>>>
>>>
>>> Thanks for the steps. I think I found what causes the labeling problem,
>>> but I'm not yet sure why. It looks like it has something to do with how
>>> the migration script rebuilds policy. If you run the migration script
>>> with the --norebuild flag, and then run semodule -B, everything is
>>> rebuilt and the files in /etc/selinux are labeled correctly.
>>>
>>> I'm not yet convinced this is the same problem as the systemd issue (I
>>> do get "unable to get valid context", but I still don't get "SELinux
>>> policy denies access"). Let me know if you still see that after using
>>> --norebuild/semodule -B.
>>
>> Ok, if I do:
>> ./libsemanage/utils/semanage_migrate_etc_to_var.py -n
>> semodule -B
>>
>> then /etc/selinux is labeled correctly and I can still login.
>> However, running su hangs and I get the systemd error message again.
> 
> Also get this:
> ERROR:dbus.proxies:Introspect error on :1.4:/org/freedesktop/login1:
> dbus.exceptions.DBusException: org.freedesktop.DBus.Error.NoReply: Did
> not receive a reply. Possible causes include: the remote application did
> not send a reply, the message bus security policy blocked the reply, the
> reply timeout expired, or the network connection was broken.
> 
> when trying to re-install the original selinux userspace packages.
> With more errors from systemd in dmesg,
> [14421.297045] systemd[1]: SELinux policy denies access.
> [14451.711732] systemd[1]: SELinux policy denies access.
> [14451.743787] systemd[1]: SELinux policy denies access.
> [14512.551210] systemd[1]: SELinux policy denies access.
> [14512.584126] systemd[1]: SELinux policy denies access.
> [14543.063872] systemd[1]: SELinux policy denies access.
> [14634.451680] systemd[1]: SELinux policy denies access.
> [14634.469813] systemd[1]: SELinux policy denies access.
> [14659.346867] systemd[1]: SELinux policy denies access.
> [14659.665108] systemd[1]: SELinux policy denies access.
> [14695.602174] systemd[1]: SELinux policy denies access.

journalctl -r shows an additional error message for each of these denials:
systemd-logind[913]: Failed to query ActiveState: Access denied


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