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#!/usr/bin/python3
# ----------------------------------------------------------------------
# Copyright (C) 2013 Kshitij Gupta <kgupta8592@gmail.com>
# Copyright (C) 2014 Canonical, Ltd.
# Copyright (C) 2015 Christian Boltz <apparmor@cboltz.de>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of version 2 of the GNU General Public
# License as published by the Free Software Foundation.
#
# 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.
#
# ----------------------------------------------------------------------
import unittest
import apparmor.severity as severity
from apparmor.common import AppArmorException
from common_test import AATest, setup_all_loops
class SeverityBaseTest(AATest):
def AASetup(self):
self.sev_db = severity.Severity('../severity.db', 'unknown')
def _capability_severity_test(self, cap, expected_rank):
rank = self.sev_db.rank_capability(cap)
self.assertEqual(rank, expected_rank,
'expected rank {}, got {}'.format(expected_rank, rank))
def _simple_severity_w_perm(self, path, perm, expected_rank):
rank = self.sev_db.rank_path(path, perm)
self.assertEqual(rank, expected_rank,
'expected rank {}, got {}'.format(expected_rank, rank))
class SeverityTest(SeverityBaseTest):
tests = (
(('/usr/bin/whatis', 'x'), 5),
(('/etc', 'x'), 'unknown'),
(('/dev/doublehit', 'x'), 0),
(('/dev/doublehit', 'rx'), 4),
(('/dev/doublehit', 'rwx'), 8),
(('/dev/tty10', 'rwx'), 9),
(('/var/adm/foo/**', 'rx'), 3),
(('/etc/apparmor/**', 'r'), 6),
(('/etc/**', 'r'), 'unknown'),
(('/usr/foo@bar', 'r'), 'unknown'), # filename containing @
(('/home/foo@bar', 'rw'), 6), # filename containing @
(('/etc/apache2/ssl.key/bar', 'r'), 7), # /etc/apache2/** (3) vs. /etc/apache2/**ssl** (7)
(('/etc/apache2/foo/ssl/bar', 'r'), 7), # additional path level triggers otherwise untested branch
(('/proc/sys/kernel/hotplug', 'rwx'), 10), # non-glob filename, severity depends on mode
)
def _run_test(self, params, expected):
self._simple_severity_w_perm(params[0], params[1], expected)
def test_invalid_rank(self):
with self.assertRaises(AppArmorException):
self._simple_severity_w_perm('unexpected_unput', 'rw', 6)
class SeverityTestCap(SeverityBaseTest):
tests = (
('KILL', 8),
('SETPCAP', 9),
('setpcap', 9),
('UNKNOWN', 'unknown'),
('K*', 'unknown'),
('__ALL__', 10),
)
def _run_test(self, params, expected):
self._capability_severity_test(params, expected)
rank = self.sev_db.rank_capability(params)
self.assertEqual(rank, expected, 'expected rank {}, got {}'.format(expected, rank))
class SeverityVarsTest(SeverityBaseTest):
tests = (
(('@{PROC}/sys/vm/overcommit_memory', 'r'), 6),
(('@{HOME}/sys/@{PROC}/overcommit_memory', 'r'), 4),
(('/overco@{multiarch}mmit_memory', 'r'), 'unknown'),
(('@{PROC}/sys/@{TFTP_DIR}/overcommit_memory', 'r'), 6),
(('@{somepaths}/somefile', 'r'), 7),
(('@{strangevar}/somefile', 'r'), 6),
)
def _run_test(self, params, expected):
vars = {
# Note: using [] instead of {} is intentional to keep order of checking (and therefore code coverage) constant
'@{HOME}': ['@{HOMEDIRS}/*/', '/root/'],
'@{HOMEDIRS}': ['/home/', '/storage/'],
'@{multiarch}': ['*-linux-gnu*'],
'@{TFTP_DIR}': ['/var/tftp /srv/tftpboot'],
'@{PROC}': ['/proc/'],
'@{somepaths}': ['/home/foo/downloads', '@{HOMEDIRS}/foo/.ssh/'],
'@{strangevar}': ['/srv/', '/proc/'],
}
self.sev_db.set_variables(vars)
self._simple_severity_w_perm(params[0], params[1], expected)
class SeverityDBTest(AATest):
def _test_db(self, contents):
self.db_file = self.writeTmpfile('severity.db', contents)
self.sev_db = severity.Severity(self.db_file)
return self.sev_db
tests = (
("CAP_LEASE 18\n", AppArmorException), # out of range
("CAP_LEASE -1\n", AppArmorException), # out of range
("/etc/passwd* 0 4\n", AppArmorException), # insufficient vals
("/etc/passwd* 0 4 5 6\n", AppArmorException), # too many vals
("/etc/passwd* -2 4 6\n", AppArmorException), # out of range
("/etc/passwd* 12 4 6\n", AppArmorException), # out of range
("/etc/passwd* 2 -4 6\n", AppArmorException), # out of range
("/etc/passwd 2 14 6\n", AppArmorException), # out of range
("/etc/passwd 2 4 -12\n", AppArmorException), # out of range
("/etc/passwd 2 4 4294967297\n", AppArmorException), # out of range
("garbage line\n", AppArmorException),
)
def _run_test(self, params, expected):
with self.assertRaises(expected):
self._test_db(params)
def test_simple_db(self):
self._test_db('''
CAP_LEASE 8
/etc/passwd* 4 8 0
''')
def test_cap_val_max_range(self):
self._test_db("CAP_LEASE 10\n")
def test_cap_val_min_range(self):
self._test_db("CAP_LEASE 0\n")
def test_invalid_db(self):
self.assertRaises(AppArmorException, severity.Severity, 'severity_broken.db')
def test_nonexistent_db(self):
self.assertRaises(IOError, severity.Severity, 'severity.db.does.not.exist')
def test_no_arg_to_severity(self):
with self.assertRaises(AppArmorException):
severity.Severity()
setup_all_loops(__name__)
if __name__ == '__main__':
unittest.main(verbosity=1)
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