From 8eee8727cb09a9fc14e899b4058fcd108f44a0eb Mon Sep 17 00:00:00 2001
From: Armin Kuster <akuster808@gmail.com>
Date: Mon, 6 May 2019 11:36:58 -0700
Subject: smack-test: add smack tests from meta-intel-iot-security

ported over smack tests

Signed-off-by: Armin Kuster <akuster808@gmail.com>
---
 recipes-mac/smack/smack-test/notroot.py            | 33 +++++++++++++
 .../smack/smack-test/smack_test_file_access.sh     | 54 ++++++++++++++++++++++
 .../test_privileged_change_self_label.sh           | 18 ++++++++
 recipes-mac/smack/smack-test/test_smack_onlycap.sh | 27 +++++++++++
 4 files changed, 132 insertions(+)
 create mode 100644 recipes-mac/smack/smack-test/notroot.py
 create mode 100644 recipes-mac/smack/smack-test/smack_test_file_access.sh
 create mode 100644 recipes-mac/smack/smack-test/test_privileged_change_self_label.sh
 create mode 100644 recipes-mac/smack/smack-test/test_smack_onlycap.sh

(limited to 'recipes-mac/smack/smack-test')

diff --git a/recipes-mac/smack/smack-test/notroot.py b/recipes-mac/smack/smack-test/notroot.py
new file mode 100644
index 0000000..f0eb0b5
--- /dev/null
+++ b/recipes-mac/smack/smack-test/notroot.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+#
+# Script used for running executables with custom labels, as well as custom uid/gid
+# Process label is changed by writing to /proc/self/attr/curent
+#
+# Script expects user id and group id to exist, and be the same.
+#
+# From adduser manual: 
+# """By  default,  each  user  in Debian GNU/Linux is given a corresponding group 
+# with the same name. """
+#
+# Usage: root@desk:~# python notroot.py <uid> <label> <full_path_to_executable> [arguments ..]
+# eg: python notroot.py 1000 User::Label /bin/ping -c 3 192.168.1.1
+#
+# Author: Alexandru Cornea <alexandru.cornea@intel.com>
+import os
+import sys
+
+try:
+	uid = int(sys.argv[1])
+	sys.argv.pop(1)
+	label = sys.argv[1]
+	sys.argv.pop(1)
+	open("/proc/self/attr/current", "w").write(label)
+	path=sys.argv[1]
+	sys.argv.pop(0)
+	os.setgid(uid)
+	os.setuid(uid)	
+	os.execv(path,sys.argv)
+
+except Exception,e:
+	print e.message
+	sys.exit(1)
diff --git a/recipes-mac/smack/smack-test/smack_test_file_access.sh b/recipes-mac/smack/smack-test/smack_test_file_access.sh
new file mode 100644
index 0000000..5a0ce84
--- /dev/null
+++ b/recipes-mac/smack/smack-test/smack_test_file_access.sh
@@ -0,0 +1,54 @@
+#!/bin/sh
+
+SMACK_PATH=`grep smack /proc/mounts | awk '{print $2}' `
+RC=0
+TMP="/tmp"
+test_file=$TMP/smack_test_access_file
+CAT=`which cat`
+ECHO=`which echo`
+uid=1000
+initial_label=`cat /proc/self/attr/current`
+python $TMP/notroot.py $uid "TheOther" $ECHO 'TEST' > $test_file
+chsmack -a "TheOther" $test_file
+
+#        12345678901234567890123456789012345678901234567890123456
+delrule="TheOne                  TheOther                -----"
+rule_ro="TheOne                  TheOther                r----"
+
+# Remove pre-existent rules for "TheOne TheOther <access>"
+echo -n "$delrule" > $SMACK_PATH/load
+python $TMP/notroot.py $uid "TheOne" $CAT $test_file 2>&1 1>/dev/null | grep -q "Permission denied" || RC=$?
+if [ $RC -ne 0 ]; then
+	echo "Process with different label than the test file and no read access on it can read it"
+	exit $RC
+fi
+
+# adding read access
+echo -n "$rule_ro" > $SMACK_PATH/load
+python $TMP/notroot.py $uid "TheOne" $CAT $test_file | grep -q "TEST" || RC=$?
+if [ $RC -ne 0 ]; then
+	echo "Process with different label than the test file but with read access on it cannot read it"
+	exit $RC
+fi
+
+# Remove pre-existent rules for "TheOne TheOther <access>"
+echo -n "$delrule" > $SMACK_PATH/load
+# changing label of test file to *
+# according to SMACK documentation, read access on a * object is always permitted
+chsmack -a '*' $test_file
+python $TMP/notroot.py $uid "TheOne" $CAT $test_file | grep -q "TEST" || RC=$?
+if [ $RC -ne 0 ]; then
+	echo  "Process cannot read file with * label"
+	exit $RC
+fi
+
+# changing subject label to *
+# according to SMACK documentation, every access requested by a star labeled subject is rejected
+TOUCH=`which touch`
+python $TMP/notroot.py $uid '*' $TOUCH $TMP/test_file_2
+ls -la $TMP/test_file_2 2>&1 | grep -q 'No such file or directory' || RC=$?
+if [ $RC -ne 0 ];then
+	echo "Process with label '*' should not have any access"
+	exit $RC
+fi
+exit 0
diff --git a/recipes-mac/smack/smack-test/test_privileged_change_self_label.sh b/recipes-mac/smack/smack-test/test_privileged_change_self_label.sh
new file mode 100644
index 0000000..26d9e9d
--- /dev/null
+++ b/recipes-mac/smack/smack-test/test_privileged_change_self_label.sh
@@ -0,0 +1,18 @@
+#!/bin/sh
+
+initial_label=`cat /proc/self/attr/current 2>/dev/null`
+modified_label="test_label"
+
+echo "$modified_label" >/proc/self/attr/current 2>/dev/null
+
+new_label=`cat /proc/self/attr/current 2>/dev/null`
+
+if [ "$new_label" != "$modified_label" ]; then
+	# restore proper label
+	echo $initial_label >/proc/self/attr/current
+	echo "Privileged process could not change its label"
+	exit 1
+fi
+
+echo "$initial_label" >/proc/self/attr/current 2>/dev/null
+exit 0
\ No newline at end of file
diff --git a/recipes-mac/smack/smack-test/test_smack_onlycap.sh b/recipes-mac/smack/smack-test/test_smack_onlycap.sh
new file mode 100644
index 0000000..1c4a93a
--- /dev/null
+++ b/recipes-mac/smack/smack-test/test_smack_onlycap.sh
@@ -0,0 +1,27 @@
+#!/bin/sh
+RC=0
+SMACK_PATH=`grep smack /proc/mounts | awk '{print $2}'`
+test_label="test_label"
+onlycap_initial=`cat $SMACK_PATH/onlycap`		
+smack_initial=`cat /proc/self/attr/current`
+
+# need to set out label to be the same as onlycap, otherwise we lose our smack privileges
+# even if we are root
+echo "$test_label" > /proc/self/attr/current
+
+echo "$test_label" > $SMACK_PATH/onlycap || RC=$?
+if [ $RC -ne 0 ]; then
+	echo "Onlycap label could not be set"
+	return $RC
+fi
+
+if [ `cat $SMACK_PATH/onlycap` != "$test_label" ]; then
+	echo "Onlycap label was not set correctly."
+	return 1
+fi
+
+# resetting original onlycap label
+echo "$onlycap_initial" > $SMACK_PATH/onlycap 2>/dev/null
+
+# resetting our initial's process label
+echo "$smack_initial" > /proc/self/attr/current
-- 
cgit v1.2.3-54-g00ecf