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apparmor/utils/test/test-mount.py
John Johansen c0fcd1698b utils: add support for priority rule prefix 
Add basic support for the priority rules prefix. This patch does not
allow the utils to set or suggest priorities. It allows parsing and
retaining of the priority prefix if it already exists on rules and
checking if it's in the supported range.

Signed-off-by: Georgia Garcia <georgia.garcia@canonical.com>
Signed-off-by: John Johansen <john.johansen@canonical.com>
2025-05-05 14:54:22 -03:00

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#!/usr/bin/python3
# ----------------------------------------------------------------------
# Copyright (C) 2024 Canonical, Ltd.
#
# 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
from collections import namedtuple
from common_test import AATest, setup_all_loops
from apparmor.common import AppArmorException, AppArmorBug
from apparmor.translations import init_translation
from apparmor.rule.mount import MountRule
_ = init_translation()
class MountTestParse(AATest):
tests = (
# Rule Operation Filesystem Options Source Destination Audit Deny Allow Comment
('mount -> **,', MountRule('mount', MountRule.ALL, MountRule.ALL, MountRule.ALL, '**', False, False, False, '')),
('mount options=(rw, shared) -> **,', MountRule('mount', MountRule.ALL, ('=', ('rw', 'shared')), MountRule.ALL, '**', False, False, False, '')),
('mount fstype=bpf options=rw bpf -> /sys/fs/bpf/,', MountRule('mount', ('=', ['bpf']), ('=', ('rw')), 'bpf', '/sys/fs/bpf/', False, False, False, '')),
('mount fstype=fuse.obex* options=rw bpf -> /sys/fs/bpf/,', MountRule('mount', ('=', ['fuse.obex*']), ('=', ('rw')), 'bpf', '/sys/fs/bpf/', False, False, False, '')),
('mount fstype=fuse.* options=rw bpf -> /sys/fs/bpf/,', MountRule('mount', ('=', ['fuse.*']), ('=', ('rw')), 'bpf', '/sys/fs/bpf/', False, False, False, '')),
('mount fstype=bpf options=(rw) random_label -> /sys/fs/bpf/,', MountRule('mount', ('=', ['bpf']), ('=', ('rw')), 'random_label', '/sys/fs/bpf/', False, False, False, '')),
('mount,', MountRule('mount', MountRule.ALL, MountRule.ALL, MountRule.ALL, MountRule.ALL, False, False, False, '')),
('mount fstype=(ext3, ext4),', MountRule('mount', ('=', ['ext3', 'ext4']), MountRule.ALL, MountRule.ALL, MountRule.ALL, False, False, False, '')),
('mount bpf,', MountRule('mount', MountRule.ALL, MountRule.ALL, 'bpf', MountRule.ALL, False, False, False, '')),
('mount none,', MountRule('mount', MountRule.ALL, MountRule.ALL, 'none', MountRule.ALL, False, False, False, '')),
('mount fstype=(procfs) none -> /foo,', MountRule('mount', ('=', ['procfs']), MountRule.ALL, 'none', '/foo', False, False, False, '')),
('mount fstype=(ext3, ext4) options=(ro),', MountRule('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), MountRule.ALL, MountRule.ALL, False, False, False, '')),
('mount @{mntpnt},', MountRule('mount', MountRule.ALL, MountRule.ALL, '@{mntpnt}', MountRule.ALL, False, False, False, '')),
('mount /a,', MountRule('mount', MountRule.ALL, MountRule.ALL, '/a', MountRule.ALL, False, False, False, '')),
('mount "/a space",', MountRule('mount', MountRule.ALL, MountRule.ALL, '/a space', MountRule.ALL, False, False, False, '')),
('mount fstype=(ext3, ext4) /a -> /b,', MountRule('mount', ('=', ['ext3', 'ext4']), MountRule.ALL, '/a', '/b', False, False, False, '')),
('mount fstype=(ext3, ext4) /a -> "/bar space",', MountRule('mount', ('=', ['ext3', 'ext4']), MountRule.ALL, '/a', '/bar space', False, False, False, '')),
('mount fstype=(ext3, ext4) options=(ro, sync) /a -> /b,', MountRule('mount', ('=', ['ext3', 'ext4']), ('=', ('ro', 'sync')), '/a', '/b', False, False, False, '')),
('mount fstype=(ext3, ext4) options=(ro, sync) /a -> /b, #cmt', MountRule('mount', ('=', ['ext3', 'ext4']), ('=', ('ro', 'sync')), '/a', '/b', False, False, False, ' #cmt')),
('mount fstype=({ext3,ext4}) options in (ro, sync) /a -> /b,', MountRule('mount', ('=', ['{ext3,ext4}']), ('in', ('ro', 'sync')), '/a', '/b', False, False, False, '')),
('mount fstype in (ext3, ext4) options=(ro, sync) /a -> /b, #cmt', MountRule('mount', ('in', ['ext3', 'ext4']), ('=', ('ro', 'sync')), '/a', '/b', False, False, False, ' #cmt')),
('mount fstype in (ext3, ext4) option in (ro, sync) /a, #cmt', MountRule('mount', ('in', ['ext3', 'ext4']), ('in', ('ro', 'sync')), '/a', MountRule.ALL, False, False, False, ' #cmt')),
('mount fstype=(ext3, ext4) option=(ro, sync) /a -> /b, #cmt', MountRule('mount', ('=', ['ext3', 'ext4']), ('=', ('ro', 'sync')), '/a', '/b', False, False, False, ' #cmt')),
('mount fstype=fuse.revokefs-fuse options=(nosuid,nodev,rw) revokefs-fuse -> /foo-*/**/,',
MountRule('mount', ('=', ['fuse.revokefs-fuse']), ('=', ('nosuid', 'nodev', 'rw')), # noqa: E127
'revokefs-fuse', '/foo-*/**/', False, False, False, '')), # noqa: E127
('mount options=(rw, rbind) {,/usr}/lib{,32,64,x32}/modules/ -> /tmp/snap.rootfs_*{,/usr}/lib/modules/,',
MountRule('mount', MountRule.ALL, ('=', ('rw', 'rbind')), '{,/usr}/lib{,32,64,x32}/modules/', # noqa: E127
'/tmp/snap.rootfs_*{,/usr}/lib/modules/', # noqa: E127
False, False, False, '')), # noqa: E127
('mount options=(runbindable, rw) -> /,', MountRule('mount', MountRule.ALL, ('=', ['runbindable', 'rw']), MountRule.ALL, '/', False, False, False, '')),
('mount "" -> /,', MountRule('mount', MountRule.ALL, MountRule.ALL, '', '/', False, False, False, '')),
('umount,', MountRule('umount', MountRule.ALL, MountRule.ALL, MountRule.ALL, MountRule.ALL, False, False, False, '')),
('umount fstype=ext3,', MountRule('umount', ('=', ['ext3']), MountRule.ALL, MountRule.ALL, MountRule.ALL, False, False, False, '')),
('umount /a,', MountRule('umount', MountRule.ALL, MountRule.ALL, MountRule.ALL, '/a', False, False, False, '')),
('remount,', MountRule('remount', MountRule.ALL, MountRule.ALL, MountRule.ALL, MountRule.ALL, False, False, False, '')),
('remount fstype=ext4,', MountRule('remount', ('=', ['ext4']), MountRule.ALL, MountRule.ALL, MountRule.ALL, False, False, False, '')),
('remount /b,', MountRule('remount', MountRule.ALL, MountRule.ALL, MountRule.ALL, '/b', False, False, False, '')),
)
def _run_test(self, rawrule, expected):
self.assertTrue(MountRule.match(rawrule))
obj = MountRule.create_instance(rawrule)
expected.raw_rule = rawrule.strip()
self.assertTrue(obj.is_equal(expected, True), f'\n {rawrule} expected,\n {obj.get_clean()} returned by obj.get_clean()\n {expected.get_clean()} returned by expected.get_clean()')
def test_valid_mount_changing_propagation(self):
# Rules changing propagation type can either specify a source or a dest (these are equivalent for apparmor_parser in this specific case) but not both.
MountRule('mount', MountRule.ALL, ('=', ('runbindable')), '/foo', MountRule.ALL)
MountRule('mount', MountRule.ALL, ('=', ('runbindable')), MountRule.ALL, '/foo')
def test_valid_bind_mount(self):
# Fstype must remain empty in bind rules
MountRule('mount', MountRule.ALL, ('=', ('bind')), '/foo', MountRule.ALL)
MountRule('mount', MountRule.ALL, ('=', ('bind')), MountRule.ALL, '/bar')
MountRule('mount', MountRule.ALL, ('=', ('bind')), '/foo', '/bar')
class MountTestParseInvalid(AATest):
tests = (
('mount fstype=,', AppArmorException),
('mount fstype=(),', AppArmorException),
('mount options=(),', AppArmorException),
('mount option=(invalid),', AppArmorException),
('mount option=(ext3ext4),', AppArmorException),
# mount rules with multiple 'options' are not supported by the tools yet, and when writing them, only the last 'options' would survive. Therefore MountRule intentionally raises an exception when parsing such a rule.
('mount options=(ro) options=(rw) fstype=ext4 -> /destination,', AppArmorException),
('mount options=(ro) fstype=ext4 options=(rw) -> /destination,', AppArmorException),
('mount options in (ro) options in (rw) fstype=ext4 -> /destination,', AppArmorException),
('mount options in (ro) fstype=ext4 options in (rw) -> /destination,', AppArmorException),
('mount options = (ro) options in (rw) fstype=ext4 -> /destination,', AppArmorException),
('mount options = (ro) fstype=ext4 options in (rw) -> /destination,', AppArmorException),
# mount rules with multiple 'fstype' are not supported by the tools yet, and when writing them, only the last 'fstype' would survive. Therefore MountRule intentionally raises an exception when parsing such a rule.
('mount options=(ro) fstype=ext3 fstype=ext4 -> /destination,', AppArmorException),
('mount fstype=ext3 options=(ro) fstype=ext4 -> /destination,', AppArmorException),
('mount options=(ro) fstype in (ext3) fstype in (ext4) -> /destination,', AppArmorException),
('mount fstype in (ext3) options=(ro) fstype in (ext4) -> /destination,', AppArmorException),
('mount options=(ro) fstype in (ext3) fstype=(ext4) -> /destination,', AppArmorException),
('mount fstype in (ext3) options=(ro) fstype=ext4 -> /destination,', AppArmorException),
)
def _run_test(self, rawrule, expected):
self.assertTrue(MountRule.match(rawrule)) # the above invalid rules still match the main regex!
with self.assertRaises(expected):
MountRule.create_instance(rawrule)
def test_parse_fail(self):
with self.assertRaises(AppArmorException):
MountRule.create_instance('foo,')
def test_diff_non_mountrule(self):
exp = namedtuple('exp', ('audit', 'deny', 'priority'))
obj = MountRule('mount', ('=', ['ext4']), MountRule.ALL, MountRule.ALL, MountRule.ALL)
with self.assertRaises(AppArmorBug):
obj.is_equal(exp(False, False, None), False)
def test_diff_invalid_fstype_equals_or_in(self):
with self.assertRaises(AppArmorBug):
MountRule('mount', ('ext3', 'ext4'), MountRule.ALL, MountRule.ALL, MountRule.ALL) # fstype[0] should be '=' or 'in'
def test_diff_invalid_fstype_aare(self):
tests = [
'mount fstype=({unclosed_regex),',
'mount fstype=({closed}twice}),',
]
for t in tests:
with self.assertRaises(AppArmorException):
MountRule.create_instance(t)
def test_diff_invalid_fstype_aare_2(self):
fslists = [
['invalid_{_regex'],
['ext4', 'invalid_}_regex'],
['ext4', '{invalid} {regex}']
]
for fslist in fslists:
with self.assertRaises(AppArmorException):
MountRule('mount', ('=', fslist), MountRule.ALL, MountRule.ALL, MountRule.ALL)
def test_diff_invalid_options_equals_or_in(self):
with self.assertRaises(AppArmorBug):
MountRule('mount', MountRule.ALL, ('rbind', 'rw'), MountRule.ALL, MountRule.ALL) # fstype[0] should be '=' or 'in'
def test_diff_invalid_options_keyword(self):
with self.assertRaises(AppArmorException):
MountRule('mount', MountRule.ALL, ('=', 'invalid'), MountRule.ALL, MountRule.ALL) # fstype[0] should be '=' or 'in'
def test_diff_fstype(self):
obj1 = MountRule('mount', ('=', ['ext4']), MountRule.ALL, MountRule.ALL, MountRule.ALL)
obj2 = MountRule('mount', MountRule.ALL, MountRule.ALL, MountRule.ALL, MountRule.ALL)
self.assertFalse(obj1.is_equal(obj2, False))
def test_diff_source(self):
obj1 = MountRule('mount', MountRule.ALL, MountRule.ALL, '/foo', MountRule.ALL)
obj2 = MountRule('mount', MountRule.ALL, MountRule.ALL, '/bar', MountRule.ALL)
self.assertFalse(obj1.is_equal(obj2, False))
def test_invalid_umount_with_source(self):
with self.assertRaises(AppArmorException):
MountRule('umount', MountRule.ALL, MountRule.ALL, '/foo', MountRule.ALL) # Umount and remount shall not have a source
def test_invalid_remount_with_source(self):
with self.assertRaises(AppArmorException):
MountRule('remount', MountRule.ALL, MountRule.ALL, '/foo', MountRule.ALL)
def test_invalid_mount_changing_propagation(self):
# Rules changing propagation type can either specify a source or a dest (these are equivalent for apparmor_parser in this specific case) but not both.
with self.assertRaises(AppArmorException):
MountRule('mount', MountRule.ALL, ('=', ('runbindable')), '/foo', '/bar')
# Rules changing propagation type cannot specify a fstype.
with self.assertRaises(AppArmorException):
MountRule('mount', ('=', ('ext4')), ('=', ('runbindable')), MountRule.ALL, '/foo')
def test_invalid_bind_mount(self):
# Bind mount rules cannot specify a fstype.
with self.assertRaises(AppArmorException):
MountRule('mount', ('=', ('ext4')), ('=', ('bind')), MountRule.ALL, '/foo')
class MountTestGlob(AATest):
def test_glob(self):
globList = [(
'mount options=(bind, rw) /home/user/Downloads/ -> /mnt/a/,',
'mount options=(bind, rw) /home/user/Downloads/,',
'mount options=(bind, rw) /home/user/*/,',
'mount options=(bind, rw) /home/**/,',
'mount options=(bind, rw),',
'mount,',
'mount,',
)]
for globs in globList:
for i in range(len(globs) - 1):
rule = MountRule.create_instance(globs[i])
rule.glob()
self.assertEqual(rule.get_clean(), globs[i + 1])
class MountTestClean(AATest):
tests = (
# raw rule clean rule
(' mount , # foo ', 'mount, # foo'),
(' mount fstype = ( sysfs ) , ', 'mount fstype=(sysfs),'),
(' mount fstype = ( sysfs , procfs ) , ', 'mount fstype=(procfs, sysfs),'),
(' mount options = ( rw ) , ', 'mount options=(rw),'),
(' mount options = ( rw , noatime ) , ', 'mount options=(noatime, rw),'),
(' mount fstype in ( sysfs ) , ', 'mount fstype in (sysfs),'),
(' mount fstype in ( sysfs , procfs ) , ', 'mount fstype in (procfs, sysfs),'),
(' mount options in ( rw ) , ', 'mount options in (rw),'),
(' mount options in ( rw , noatime ) , ', 'mount options in (noatime, rw),'),
(' mount none -> /foo , ', 'mount none -> /foo,'),
(' mount "" -> /foo , ', 'mount "" -> /foo,'),
(' mount "/f /b" -> "/foo bar" , ', 'mount "/f /b" -> "/foo bar",'),
(' umount , ', 'umount,'),
(' umount /foo , ', 'umount /foo,'),
(' remount , ', 'remount,'),
(' remount /foo , ', 'remount /foo,'),
('priority =1 mount "" -> /foo , ', 'priority=1 mount "" -> /foo,'),
('priority=0 audit mount "/f /b" -> "/foo bar" , ', 'priority=0 audit mount "/f /b" -> "/foo bar",'),
(' priority = +10 umount , ', 'priority=10 umount,'),
(' priority=-2 deny umount /foo , ', 'priority=-2 deny umount /foo,'),
('priority= 32 audit deny remount , ', 'priority=32 audit deny remount,'),
(' priority = -32 remount /foo , ', 'priority=-32 remount /foo,'),
)
def _run_test(self, rawrule, expected):
self.assertTrue(MountRule.match(rawrule))
obj = MountRule.create_instance(rawrule)
clean = obj.get_clean()
raw = obj.get_raw()
self.assertEqual(expected, clean, 'unexpected clean rule')
self.assertEqual(rawrule.strip(), raw, 'unexpected raw rule')
class MountLogprofHeaderTest(AATest):
tests = (
('mount,', [_('Operation'), _('mount'), _('Fstype'), _('ALL'), _('Options'), _('ALL'), _('Source'), _('ALL'), _('Destination'), _('ALL')]),
('mount options=(ro, nosuid) /a,', [_('Operation'), _('mount'), _('Fstype'), _('ALL'), _('Options'), ('=', _('nosuid ro')), _('Source'), _('/a'), _('Destination'), _('ALL')]),
('mount fstype=(ext3, ext4) options=(ro, nosuid) /a -> /b,', [_('Operation'), _('mount'), _('Fstype'), ('=', _('ext3 ext4')), _('Options'), ('=', _('nosuid ro')), _('Source'), _('/a'), _('Destination'), _('/b')])
)
def _run_test(self, params, expected):
obj = MountRule.create_instance(params)
self.assertEqual(obj.logprof_header(), expected)
class MountIsCoveredTest(AATest):
def test_is_covered(self):
obj = MountRule('mount', ('=', ('ext3', 'ext4')), ('=', ('ro')), '/foo/b*', '/b*')
tests = [
('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), '/foo/b', '/bar'),
('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), '/foo/bar', '/b')
]
for test in tests:
self.assertTrue(obj.is_covered(MountRule(*test)))
self.assertFalse(obj.is_equal(MountRule(*test)))
def test_is_covered_fs_source(self):
obj = MountRule('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), 'tmpfs', MountRule.ALL)
self.assertTrue(obj.is_covered(MountRule('mount', ('=', ['ext3']), ('=', ('ro')), 'tmpfs', MountRule.ALL)))
self.assertFalse(obj.is_equal(MountRule('mount', ('=', ['ext3']), ('=', ('ro')), 'tmpfs', MountRule.ALL)))
def test_is_covered_aare_1(self):
obj = MountRule('mount', ('=', ['sys*', 'fuse.*']), ('=', ('ro')), 'tmpfs', MountRule.ALL)
tests = [
('mount', ('=', ['sysfs', 'fuse.s3fs']), ('=', ('ro')), 'tmpfs', MountRule.ALL),
('mount', ('=', ['sysfs', 'fuse.jmtpfs', 'fuse.s3fs', 'fuse.obexfs', 'fuse.obexautofs', 'fuse.fuseiso']), ('=', ('ro')), 'tmpfs', MountRule.ALL)
]
for test in tests:
self.assertTrue(obj.is_covered(MountRule(*test)))
self.assertFalse(obj.is_equal(MountRule(*test)))
def test_is_covered_aare_2(self):
obj = MountRule('mount', ('=', ['ext{3,4}', '{cgroup*,fuse.*}']), ('=', ('ro')), 'tmpfs', MountRule.ALL)
tests = [
('mount', ('=', ['ext3']), ('=', ('ro')), 'tmpfs', MountRule.ALL),
('mount', ('=', ['ext3', 'ext4', 'cgroup', 'cgroup2', 'fuse.jmtpfs', 'fuse.s3fs', 'fuse.obexfs', 'fuse.obexautofs', 'fuse.fuseiso']), ('=', ('ro')), 'tmpfs', MountRule.ALL)
]
for test in tests:
self.assertTrue(obj.is_covered(MountRule(*test)))
self.assertFalse(obj.is_equal(MountRule(*test)))
def test_is_notcovered(self):
obj = MountRule('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), '/foo/b*', '/b*')
tests = [
('mount', ('in', ['ext3', 'ext4']), ('=', ('ro')), '/foo/bar', '/bar'),
('mount', ('=', ['procfs', 'ext4']), ('=', ('ro')), '/foo/bar', '/bar'),
('mount', ('=', ['ext3']), ('=', ('rw')), '/foo/bar', '/bar'),
('mount', ('=', ['ext3', 'ext4']), MountRule.ALL, '/foo/b*', '/bar'),
('mount', MountRule.ALL, ('=', ('ro')), '/foo/b*', '/bar'),
('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), '/invalid/bar', '/bar'),
('umount', MountRule.ALL, MountRule.ALL, MountRule.ALL, '/bar'),
('remount', MountRule.ALL, MountRule.ALL, MountRule.ALL, '/bar'),
('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), 'tmpfs', '/bar'),
('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), '/foo/b*', '/invalid'),
]
for test in tests:
self.assertFalse(obj.is_covered(MountRule(*test)))
self.assertFalse(obj.is_equal(MountRule(*test)))
def test_is_not_covered_fs_source(self):
obj = MountRule('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), 'tmpfs', MountRule.ALL)
test = ('mount', ('=', ['ext3', 'ext4']), ('=', ('ro')), 'procfs', MountRule.ALL)
self.assertFalse(obj.is_covered(MountRule(*test)))
self.assertFalse(obj.is_equal(MountRule(*test)))
def test_is_not_covered_fs_options(self):
obj = MountRule('mount', MountRule.ALL, ('=', ('ro')), 'tmpfs', MountRule.ALL)
test = ('mount', MountRule.ALL, ('=', ('rw')), 'procfs', MountRule.ALL)
self.assertFalse(obj.is_covered(MountRule(*test)))
self.assertFalse(obj.is_equal(MountRule(*test)))
setup_all_loops(__name__)
if __name__ == '__main__':
unittest.main(verbosity=1)
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