[tests/selinux] pr775-checkpolicy-revdeps: test if systemd can read symlinks under /var/lib/

[tests/selinux] pr775-checkpolicy-revdeps: test if systemd can read symlinks under /var/lib/

[Milos Malik]

            A new commit has been pushed.

            Repo   : tests/selinux
            Branch : pr775-checkpolicy-revdeps
            Commit : efc6c0b001cc0a48858b9826205080e3d774e6f9
            Author : Milos Malik <mmalik@redhat.com>
            Date   : 2022-10-25T08:14:52+00:00
            Stats  : +11/-0 in 3 file(s)
            URL    : https://src.fedoraproject.org/tests/selinux/c/efc6c0b001cc0a48858b9826205080e3d774e6f9?branch=pr775-checkpolicy-revdeps

            Log:
            test if systemd can read symlinks under /var/lib/

The use of DynamicUser and StateDirectory features of systemd
in customer environments revealed that SELinux prevents the systemd
processes from reading the symbolic links under /var/lib directory.
The TC reproduces the situation.

Detailed information can be found at:
 * https://www.redhat.com/sysadmin/systemd-secure-services

In order to fully support the systemd secure services feature,
I believe that SELinux policy should allow this access. The TC
looks for appropriate policy rules and file context patterns.

The TC covers BZ#2118784.

---
diff --git a/selinux-policy/systemd-run-and-similar/Makefile b/selinux-policy/systemd-run-and-similar/Makefile
index db39990..9211248 100644
--- a/selinux-policy/systemd-run-and-similar/Makefile
+++ b/selinux-policy/systemd-run-and-similar/Makefile
@@ -63,6 +63,7 @@ $(METADATA): Makefile
 	@echo "Bug:             1559409" >> $(METADATA) # Fedora 27
 	@echo "Bug:             1647162" >> $(METADATA) # Fedora 29
 	@echo "Bug:             1980241" >> $(METADATA) # Fedora 34
+	@echo "Bug:             2118784" >> $(METADATA) # RHEL-8
 
 	rhts-lint $(METADATA)
 

diff --git a/selinux-policy/systemd-run-and-similar/main.fmf b/selinux-policy/systemd-run-and-similar/main.fmf
index 30fce17..0201f70 100644
--- a/selinux-policy/systemd-run-and-similar/main.fmf
+++ b/selinux-policy/systemd-run-and-similar/main.fmf
@@ -35,6 +35,7 @@ link:
   - relates: https://bugzilla.redhat.com/show_bug.cgi?id=1559409
   - relates: https://bugzilla.redhat.com/show_bug.cgi?id=1647162
   - relates: https://bugzilla.redhat.com/show_bug.cgi?id=1980241
+  - verifies: https://bugzilla.redhat.com/show_bug.cgi?id=2118784
 adjust:
   - enabled: false
     when: distro == rhel-4, rhel-5, rhel-6, rhel-7

diff --git a/selinux-policy/systemd-run-and-similar/runtest.sh b/selinux-policy/systemd-run-and-similar/runtest.sh
index b594138..6645068 100755
--- a/selinux-policy/systemd-run-and-similar/runtest.sh
+++ b/selinux-policy/systemd-run-and-similar/runtest.sh
@@ -62,6 +62,15 @@ rlJournalStart
         fi
     rlPhaseEnd
 
+    rlPhaseStartTest "bz#2118784"
+        rlSEMatchPathCon "/var/lib" "var_lib_t"
+        rlSEMatchPathCon "/var/lib/myservice0" "var_lib_t"
+        rlSESearchRule "allow init_t var_lib_t : lnk_file { getattr read } [ ]"
+        rlRun "systemd-run -p DynamicUser=yes -p StateDirectory=myservice0  touch /var/lib/myservice0/foo"
+        rlRun "systemd-run -p DynamicUser=yes -p StateDirectory=myservice0 --pipe wc -c /var/lib/myservice0/foo"
+        rlRun "ls -alZ /var/lib/myservice0 /var/lib/private/myservice0"
+    rlPhaseEnd
+
     rlPhaseStartCleanup
         sleep 2
         rlSECheckAVC