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# Copyright (C) 2015-2016 Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# 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, see <http://www.gnu.org/licenses/>.
'''Functional ('black-box') tests for all 'sandboxlib' backends.'''
import pytest
import os
import sandboxlib
from programs import (
file_is_writable_test_program, file_or_directory_exists_test_program,
session_tmpdir)
@pytest.fixture(params=['chroot', 'linux_user_chroot'])
def sandboxlib_executor(request):
executor = getattr(sandboxlib, request.param)
if request.param == 'chroot' and os.getuid() != 0:
pytest.skip('chroot backend can only be used by root users')
return executor
def test_no_output(sandboxlib_executor):
'''Test ignoring of stderr/stdout.
We could use run_sandbox_with_redirection() and not get the 'err' and 'out'
paramemter at all, but we may as well test that they are indeed None.
'''
exit, out, err = sandboxlib_executor.run_sandbox(
['echo', 'xyzzy'], stdout=None, stderr=None)
assert exit == 0
assert out is None
assert err is None
def test_stdout(sandboxlib_executor):
exit, out, err = sandboxlib_executor.run_sandbox(['echo', 'xyzzy'])
assert exit == 0
assert out.decode('unicode-escape') == 'xyzzy\n'
assert err.decode('unicode-escape') == ''
def test_current_working_directory(sandboxlib_executor, tmpdir):
exit, out, err = sandboxlib_executor.run_sandbox(
['pwd'], cwd=str(tmpdir))
assert exit == 0
assert out.decode('unicode-escape') == '%s\n' % str(tmpdir)
assert err.decode('unicode-escape') == ''
class TestMounts(object):
@pytest.fixture()
def mounts_test_sandbox(self, tmpdir,
file_or_directory_exists_test_program):
sandbox_path = tmpdir.mkdir('sandbox')
bin_path = sandbox_path.mkdir('bin')
file_or_directory_exists_test_program.copy(bin_path)
bin_path.join('test-file-or-directory-exists').chmod(0o755)
return sandbox_path
def test_mount_proc(self, sandboxlib_executor, mounts_test_sandbox):
exit, out, err = sandboxlib_executor.run_sandbox(
['test-file-or-directory-exists', '/proc'],
filesystem_root=str(mounts_test_sandbox),
extra_mounts=[(None, '/proc', 'proc')])
assert err.decode('unicode-escape') == ''
assert out.decode('unicode-escape') == "/proc exists"
assert exit == 0
def test_mount_tmpfs(self, sandboxlib_executor, mounts_test_sandbox):
exit, out, err = sandboxlib_executor.run_sandbox(
['test-file-or-directory-exists', '/dev/shm'],
filesystem_root=str(mounts_test_sandbox),
extra_mounts=[(None, '/dev/shm', 'tmpfs')])
assert err.decode('unicode-escape') == ''
assert out.decode('unicode-escape') == "/dev/shm exists"
assert exit == 0
class TestWriteablePaths(object):
@pytest.fixture()
def writable_paths_test_sandbox(self, tmpdir,
file_is_writable_test_program):
sandbox_path = tmpdir.mkdir('sandbox')
bin_path = sandbox_path.mkdir('bin')
file_is_writable_test_program.copy(bin_path)
bin_path.join('test-file-is-writable').chmod(0o755)
data_path = sandbox_path.mkdir('data')
data_path = data_path.mkdir('1')
data_path.join('canary').write("Please don't overwrite me.")
return sandbox_path
def test_none_writable(self, sandboxlib_executor,
writable_paths_test_sandbox):
if sandboxlib_executor == sandboxlib.chroot:
pytest.xfail("chroot backend doesn't support read-only paths.")
exit, out, err = sandboxlib_executor.run_sandbox(
['test-file-is-writable', '/data/1/canary'],
filesystem_root=str(writable_paths_test_sandbox),
filesystem_writable_paths='none')
assert err.decode('unicode-escape') == ''
assert out.decode('unicode-escape') == \
"Couldn't open /data/1/canary for writing."
assert exit == 1
def test_some_writable(self, sandboxlib_executor,
writable_paths_test_sandbox):
if sandboxlib_executor == sandboxlib.chroot:
pytest.xfail("chroot backend doesn't support read-only paths.")
exit, out, err = sandboxlib_executor.run_sandbox(
['test-file-is-writable', '/data/1/canary'],
filesystem_root=str(writable_paths_test_sandbox),
filesystem_writable_paths=['/data/1'])
assert err.decode('unicode-escape') == ''
assert out.decode('unicode-escape') == \
"Wrote data to /data/1/canary."
assert exit == 0
def test_all_writable(self, sandboxlib_executor,
writable_paths_test_sandbox):
exit, out, err = sandboxlib_executor.run_sandbox(
['test-file-is-writable', '/data/1/canary'],
filesystem_root=str(writable_paths_test_sandbox),
filesystem_writable_paths='all')
assert err.decode('unicode-escape') == ''
assert out.decode('unicode-escape') == \
"Wrote data to /data/1/canary."
assert exit == 0
def test_mount_point_not_writable(self, sandboxlib_executor,
writable_paths_test_sandbox):
if sandboxlib_executor == sandboxlib.chroot:
pytest.xfail("chroot backend doesn't support read-only paths.")
exit, out, err = sandboxlib_executor.run_sandbox(
['test-file-is-writable', '/data/1/canary'],
filesystem_root=str(writable_paths_test_sandbox),
filesystem_writable_paths='none')
assert err.decode('unicode-escape') == ''
assert out.decode('unicode-escape') == \
"Couldn't open /data/1/canary for writing."
assert exit == 1
def test_mount_point_writable(self, sandboxlib_executor,
writable_paths_test_sandbox):
if sandboxlib_executor == sandboxlib.chroot:
pytest.xfail("chroot backend doesn't support read-only paths.")
exit, out, err = sandboxlib_executor.run_sandbox(
['test-file-is-writable', '/data/1/canary'],
filesystem_root=str(writable_paths_test_sandbox),
filesystem_writable_paths=['/data'])
assert err.decode('unicode-escape') == ''
assert out.decode('unicode-escape') == \
"Wrote data to /data/1/canary."
assert exit == 0
def test_executor_for_platform():
'''Simple test of backend autodetection.'''
executor = sandboxlib.executor_for_platform()
test_stdout(executor)
def test_degrade_config_for_capabilities(sandboxlib_executor):
'''Simple test of adjusting configuration for a given backend.'''
in_config = {
'mounts': 'isolated',
'network': 'isolated',
'filesystem_writable_paths': ['/tmp']
}
out_config = sandboxlib_executor.degrade_config_for_capabilities(
in_config, warn=True)
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