Created attachment 997245 [details]
Files needed to reproduce (selinux policy, unit files, service directory)
Description of problem:
When systemd creates a new socket for socket activation it does not set the right selinux label on the created socket.
Steps to Reproduce:
1. See my example selinux policy module (install it)
2. Install my lala.service and lala.socket systemd unit files
3. Create a directory /lala
4. Check if ls -lahZ /lala shows the lala_t label for /lala
5. If not run restorecon on /lala
6. Start the lala.socket service with systemctl start lala.socket
7. Check if /lala/lala.sock has the lala_t label:
It has not!!! <- bug?
8. Restart service lala.socket with systemctl restart lala.socket
9. Check if /lala/lala.sock has the lala_t label:
It has! <- This should have happened in the first place
I can't compile a module from the files that you've provided.
# checkmodule -o lala.mod lala.te
checkmodule: loading policy configuration from lala.te
lala.te:1:ERROR 'syntax error' at token 'policy_module' on line 1:
checkmodule: error(s) encountered while parsing configuration
I used make -f /usr/share/selinux/devel/Makefile in the selinux module directory to compile the module. See: https://fedoraproject.org/wiki/PackagingDrafts/SELinux
Ok, I can reproduce this on the latest upstream version from git (commit 9a71b1122c6e49dd9227f82b2f53837c7ea13019).
Do we need to create an upstream ticket?
I'm not sure. After I rebooted the machine, the socket is always created with the correct label...
Maybe we do not reload the policy correctly? It would be good to test the patch from https://bugzilla.redhat.com/show_bug.cgi?id=1195330 along with this.
So I managed to reproduce this again by disabling the lala policy, rebooting and enabling it again.
So yes, it looks like the policy is not correctly reloaded. In shared/selinux-util.c, in mac_selinux_bind() this line
selabel_lookup_raw(label_hnd, &fcon, path, S_IFSOCK)
sets fcon to system_u:object_r:default_t:s0. The problem is re-reproducible by stopping the lala.socket service, removing /lala/lala.sock and starting the socket again.
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Not sure if this is still a problem...
I can confirm this still is a bug on CentOS7.
I've been facing this problem for a long time on CentOS 7. I thought I was doing something wrong.