- Run the SELinux helper after GitLab Workhorse and other files are
  created ensuring their file contexts are restored
- Place GitLab Workhorse socket files into a sockets directory allowing
  the SELinux file context to be inherited on service restarts
- Add a GitLab Workhorse helper to ensure that new UNIX sockets for
  Workhorse always inherit the proper SELinux file context

Signed-off-by: Robert Marshall <rmarshall@gitlab.com>

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

CentOS 8 requires that pathnames be present when calling `restorecon`,
but this was not a requirement in CentOS 7. We fix this by moving all
SELinux-related changes to the gitlab::selinux recipe so that all the required
files and directories can be made before any SELinux changes are applied. This
makes sense from a code organization standpoint and also has the nice side
effect of removing the need to ignore unknown files (-i option in restorecon)
as well.

This commit is essentially commit 5b992246 by
Stan Hu, rebased against latest master

Signed-off-by: Balasankar "Balu" C <balasankar@gitlab.com>

For fast SSH key lookups to work (https://docs.gitlab.com/ee/administration/operations/fast_ssh_key_lookup.html),
SELinux spawns `/opt/gitlab/embedded/service/gitlab-shell/bin/gitlab-shell-authorized-keys-check`
and needs the following access:

* Read: /var/opt/gitlab/gitlab-shell/config.yml
* Read: /var/opt/gitlab/gitlab-rails/etc/gitlab_shell_secret
* Write: /var/log/gitlab/gitlab-shell/gitlab-shell.log
* Connect: unicorn (port 8080)

Because the SELinux policy is a static policy, right now we don't support the
ability to change internal unicorn ports. Admins would have to create a
special .te file for the environment, or we'd have to dynamically generate it
for them, which is it a bit tricky if they have changed their port contexts.

Granting `http_cache_port_t` permissions also includes access to these ports:

```
http_cache_port_t              tcp      8080, 8118, 8123, 10001-10010
http_cache_port_t              udp      3130
```

Closes #2855

Add redhat helper and adapt selinux recipe to use it.

See merge request !385

This commit adds an SELinux module for Centos 7 that enables ssh-keygen
to read the temporary files GitLab creates for it.

Repo
https://github.com/opscode/omnibus-chef-server.git
Path
files/chef-server-cookbooks/chef-server/recipes/bootstrap.rb
files/chef-server-cookbooks/chef-server/recipes/bootstrap_disable.rb
Revision
6a11fd840045a7ae7961e5a37439371b7407f3e9