libselinux: Add new test covering get_default_context

Perform lookup of a default context for system_u:system_r:crond_t. This
should return context derived from "system_r:system_cronjob_t", but
fails, because of a kernel bug, when libselinux uses
security_compute_user (deprecated).
See https://bugzilla.redhat.com/show_bug.cgi?id=1879368

libselinux/get_default_context/Makefile

@@ -0,0 +1,68 @@
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Makefile of /CoreOS/libselinux/Regression/get_default_context
+#   Description: Does get_default_context_with_rolelevel work as expected?
+#   Author:  Vit Mojzis <vmojzis@redhat.com>
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright (c) 2020 Red Hat, Inc. All rights reserved.
+#
+#   This copyrighted material is made available to anyone wishing
+#   to use, modify, copy, or redistribute it subject to the terms
+#   and conditions of the GNU General Public License version 2.
+#
+#   This program is distributed in the hope that it will be
+#   useful, but WITHOUT ANY WARRANTY; without even the implied
+#   warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+#   PURPOSE. See the GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public
+#   License along with this program; if not, write to the Free
+#   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+#   Boston, MA 02110-1301, USA.
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+export TEST=/CoreOS/libselinux/Regression/get_default_context
+export TESTVERSION=1.0
+
+BUILT_FILES=
+
+FILES=$(METADATA) runtest.sh Makefile PURPOSE reproducer.py
+
+.PHONY: all install download clean
+
+run: $(FILES) build
+	./runtest.sh
+
+build: $(BUILT_FILES)
+	chmod a+x runtest.sh
+	chcon -t bin_t runtest.sh
+	chmod a+x reproducer.py
+	chcon -t bin_t reproducer.py
+
+clean:
+	rm -f *~ $(BUILT_FILES)
+
+include /usr/share/rhts/lib/rhts-make.include
+
+$(METADATA): Makefile
+	@echo "Owner:           Vit Mojzis <vmojzis@redhat.com>" > $(METADATA)
+	@echo "Name:            $(TEST)" >> $(METADATA)
+	@echo "TestVersion:     $(TESTVERSION)" >> $(METADATA)
+	@echo "Path:            $(TEST_DIR)" >> $(METADATA)
+	@echo "Description:     Does get_default_context_with_rolelevel work as expected?" >> $(METADATA)
+	@echo "Type:            Regression" >> $(METADATA)
+	@echo "TestTime:        10m" >> $(METADATA)
+	@echo "RunFor:          libselinux" >> $(METADATA)
+	@echo "Requires:        python3 python3-libselinux libselinux libselinux-utils" >> $(METADATA)
+	@echo "Environment:     AVC_ERROR=+no_avc_check" >> $(METADATA)
+	@echo "Priority:        Normal" >> $(METADATA)
+	@echo "License:         GPLv2" >> $(METADATA)
+	@echo "Confidential:    no" >> $(METADATA)
+	@echo "Destructive:     no" >> $(METADATA)
+	@echo "Releases:        -RHEL4 -RHEL5 -RHEL6 -RHEL7" >> $(METADATA)
+	@echo "Bug:             1879368" >> $(METADATA) # RHEL-8.3
+
+	rhts-lint $(METADATA)

libselinux/get_default_context/PURPOSE

@@ -0,0 +1,7 @@
+PURPOSE of /CoreOS/libselinux/Regression/get_default_context
+Author: Vit Mojzis <vmojzis@redhat.com>
+Perform lookup of a default context for system_u:system_r:crond_t. This should
+return context derived from "system_r:system_cronjob_t", but fails,
+because of a kernel bug, when libselinux uses security_compute_user
+(deprecated).
+See https://bugzilla.redhat.com/show_bug.cgi?id=1879368

libselinux/get_default_context/main.fmf

@@ -0,0 +1,2 @@
+path: /libselinux/get_default_context
+tier: 1

libselinux/get_default_context/reproducer.py

@@ -0,0 +1,18 @@
+#!/usr/bin/python3
+from selinux import get_default_context_with_rolelevel
+
+context='system_u:system_r:crond_t:s0-s0:c1000.c1001,c1003.c1004,c1006.c1007,c1023'
+user='system_u'
+role='system_r'
+(ret, result) = get_default_context_with_rolelevel(user, role, None, context)
+
+print("Return value: ", ret)
+print("Result: ", result )
+
+if ret == 0:
+    if result and (not result.startswith("system_u:system_r:system_cronjob_t")):
+        print("Unexpected result: ", result)
+        exit(1)
+else:
+    print("Failed to get default context!")
+    exit(ret)

libselinux/get_default_context/runtest.sh

@@ -0,0 +1,51 @@
+#!/bin/bash
+# vim: dict=/usr/share/beakerlib/dictionary.vim cpt=.,w,b,u,t,i,k
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   runtest.sh of /CoreOS/libselinux/Regression/get_default_context
+#   Description: Does get_default_context_with_rolelevel work as expected?
+#   Author:  Vit Mojzis <vmojzis@redhat.com>
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+#
+#   Copyright (c) 2020 Red Hat, Inc. All rights reserved.
+#
+#   This copyrighted material is made available to anyone wishing
+#   to use, modify, copy, or redistribute it subject to the terms
+#   and conditions of the GNU General Public License version 2.
+#
+#   This program is distributed in the hope that it will be
+#   useful, but WITHOUT ANY WARRANTY; without even the implied
+#   warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
+#   PURPOSE. See the GNU General Public License for more details.
+#
+#   You should have received a copy of the GNU General Public
+#   License along with this program; if not, write to the Free
+#   Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+#   Boston, MA 02110-1301, USA.
+#
+# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+# Include Beaker environment
+. /usr/bin/rhts-environment.sh || exit 1
+. /usr/share/beakerlib/beakerlib.sh || exit 1
+
+PACKAGE="libselinux"
+
+rlJournalStart
+    rlPhaseStartSetup
+        rlAssertRpm ${PACKAGE}
+        rlAssertRpm python3-${PACKAGE}
+        rlRun "setenforce 1"
+        rlRun "sestatus"
+    rlPhaseEnd
+
+    rlPhaseStartTest "#1879368"
+        rlRun "cat ./reproducer.py"
+        rlRun "./reproducer.py" 0
+    rlPhaseEnd
+
+    rlPhaseStartCleanup
+    rlPhaseEnd
+rlJournalPrintText
+rlJournalEnd