Now that we know more about types (both for processes as well as files and other resources), let's look into how these are used in the SELinux policy in more detail.
We have discussed the sesearch application already and how it can be used to query the current SELinux policy. Let's look again at the process transitions:
$ sesearch -s initrc_t -t httpd_t -c process -p transition -A
Found 1 semantic av rules:
allow initrc_domain daemon : process transition ;
Even though we asked for the rules related to the initrc_t source domain and the httpd_t target, we get a rule back for the initrc_domain source domain and the daemon target. What sesearch did here was show us how the requested permission is allowed by SELinux, but through attributes assigned to the initrc_t and httpd_t types.
Type attributes in SELinux are used to group multiple types and assign privileges to those groups rather than having to assign the...