227 lines
8.1 KiB
Python
227 lines
8.1 KiB
Python
# -*- encoding: utf8 -*-
|
|
#
|
|
# The Qubes OS Project, http://www.qubes-os.org
|
|
#
|
|
# Copyright (C) 2017 Marek Marczykowski-Górecki
|
|
# <marmarek@invisiblethingslab.com>
|
|
#
|
|
# This program is free software; you can redistribute it and/or modify
|
|
# it under the terms of the GNU Lesser General Public License as published by
|
|
# the Free Software Foundation; either version 2 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# 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 Lesser General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU Lesser General Public License along
|
|
# with this program; if not, see <http://www.gnu.org/licenses/>.
|
|
|
|
'''Base classes for managed objects'''
|
|
|
|
import ast
|
|
import qubesmgmt.exc
|
|
|
|
DEFAULT = object()
|
|
|
|
|
|
class PropertyHolder(object):
|
|
'''A base class for object having properties retrievable using mgmt API.
|
|
|
|
Warning: each (non-private) local attribute needs to be defined at class
|
|
level, even if initialized in __init__; otherwise will be treated as
|
|
property retrievable using mgmt call.
|
|
'''
|
|
#: a place for appropriate Qubes() object (QubesLocal or QubesRemote),
|
|
# use None for self
|
|
app = None
|
|
|
|
def __init__(self, app, method_prefix, method_dest):
|
|
#: appropriate Qubes() object (QubesLocal or QubesRemote), use None
|
|
# for self
|
|
self.app = app
|
|
self._method_prefix = method_prefix
|
|
self._method_dest = method_dest
|
|
self._properties = None
|
|
self._properties_help = None
|
|
|
|
def qubesd_call(self, dest, method, arg=None, payload=None):
|
|
'''
|
|
Call into qubesd using appropriate mechanism. This method should be
|
|
defined by a subclass.
|
|
|
|
:param dest: Destination VM name
|
|
:param method: Full API method name ('mgmt...')
|
|
:param arg: Method argument (if any)
|
|
:param payload: Payload send to the method
|
|
:return: Data returned by qubesd (string)
|
|
'''
|
|
# have the actual implementation at Qubes() instance
|
|
if self.app:
|
|
return self.app.qubesd_call(dest, method, arg, payload)
|
|
raise NotImplementedError
|
|
|
|
@staticmethod
|
|
def _parse_qubesd_response(response_data):
|
|
'''Parse response from qubesd.
|
|
|
|
In case of success, return actual data. In case of error,
|
|
raise appropriate exception.
|
|
'''
|
|
|
|
if len(response_data) == 0:
|
|
raise qubesmgmt.exc.QubesDaemonNoResponseError(
|
|
'Got empty response from qubesd')
|
|
|
|
if response_data[0:2] == b'\x30\x00':
|
|
return response_data[2:]
|
|
elif response_data[0:2] == b'\x32\x00':
|
|
(_, exc_type, _traceback, format_string, args) = \
|
|
response_data.split(b'\x00', 4)
|
|
# drop last field because of terminating '\x00'
|
|
args = [arg.decode() for arg in args.split(b'\x00')[:-1]]
|
|
format_string = format_string.decode('utf-8')
|
|
exc_type = exc_type.decode('ascii')
|
|
try:
|
|
exc_class = getattr(qubesmgmt.exc, exc_type)
|
|
except AttributeError:
|
|
if exc_type.endswith('Error'):
|
|
exc_class = __builtins__.get(exc_type,
|
|
qubesmgmt.exc.QubesException)
|
|
else:
|
|
exc_class = qubesmgmt.exc.QubesException
|
|
# TODO: handle traceback if given
|
|
raise exc_class(format_string, *args)
|
|
else:
|
|
raise qubesmgmt.exc.QubesDaemonCommunicationError(
|
|
'Invalid response format')
|
|
|
|
def property_list(self):
|
|
'''
|
|
List available properties (their names).
|
|
|
|
:return: list of strings
|
|
'''
|
|
if self._properties is None:
|
|
properties_str = self.qubesd_call(
|
|
self._method_dest,
|
|
self._method_prefix + 'List',
|
|
None,
|
|
None)
|
|
self._properties = properties_str.decode('ascii').splitlines()
|
|
# TODO: make it somehow immutable
|
|
return self._properties
|
|
|
|
def property_help(self, name):
|
|
'''
|
|
Get description of a property.
|
|
|
|
:return: property help text
|
|
'''
|
|
help_text = self.qubesd_call(
|
|
self._method_dest,
|
|
self._method_prefix + 'Help',
|
|
name,
|
|
None)
|
|
return help_text.decode('ascii')
|
|
|
|
def property_is_default(self, item):
|
|
'''
|
|
Check if given property have default value
|
|
|
|
:param str item: name of property
|
|
:return: bool
|
|
'''
|
|
if item.startswith('_'):
|
|
raise AttributeError(item)
|
|
property_str = self.qubesd_call(
|
|
self._method_dest,
|
|
self._method_prefix + 'Get',
|
|
item,
|
|
None)
|
|
(default, _value) = property_str.split(b' ', 1)
|
|
assert default.startswith(b'default=')
|
|
is_default_str = default.split(b'=')[1]
|
|
is_default = ast.literal_eval(is_default_str.decode('ascii'))
|
|
assert isinstance(is_default, bool)
|
|
return is_default
|
|
|
|
def __getattr__(self, item):
|
|
# pylint: disable=too-many-return-statements
|
|
if item.startswith('_'):
|
|
raise AttributeError(item)
|
|
try:
|
|
property_str = self.qubesd_call(
|
|
self._method_dest,
|
|
self._method_prefix + 'Get',
|
|
item,
|
|
None)
|
|
except qubesmgmt.exc.QubesDaemonNoResponseError:
|
|
raise qubesmgmt.exc.QubesPropertyAccessError(item)
|
|
(_default, prop_type, value) = property_str.split(b' ', 2)
|
|
prop_type = prop_type.decode('ascii')
|
|
if not prop_type.startswith('type='):
|
|
raise qubesmgmt.exc.QubesDaemonCommunicationError(
|
|
'Invalid type prefix received: {}'.format(prop_type))
|
|
(_, prop_type) = prop_type.split('=', 1)
|
|
value = value.decode()
|
|
if prop_type == 'str':
|
|
return str(value)
|
|
elif prop_type == 'bool':
|
|
if value == '':
|
|
raise AttributeError
|
|
return ast.literal_eval(value)
|
|
elif prop_type == 'int':
|
|
if value == '':
|
|
raise AttributeError
|
|
return ast.literal_eval(value)
|
|
elif prop_type == 'vm':
|
|
if value == '':
|
|
return None
|
|
return self.app.domains[value]
|
|
elif prop_type == 'label':
|
|
if value == '':
|
|
return None
|
|
# TODO
|
|
return self.app.labels[value]
|
|
else:
|
|
raise qubesmgmt.exc.QubesDaemonCommunicationError(
|
|
'Received invalid value type: {}'.format(prop_type))
|
|
|
|
def __setattr__(self, key, value):
|
|
if key.startswith('_') or key in dir(self):
|
|
return super(PropertyHolder, self).__setattr__(key, value)
|
|
if value is qubesmgmt.DEFAULT:
|
|
try:
|
|
self.qubesd_call(
|
|
self._method_dest,
|
|
self._method_prefix + 'Reset',
|
|
key,
|
|
None)
|
|
except qubesmgmt.exc.QubesDaemonNoResponseError:
|
|
raise qubesmgmt.exc.QubesPropertyAccessError(key)
|
|
else:
|
|
if isinstance(value, qubesmgmt.vm.QubesVM):
|
|
value = value.name
|
|
try:
|
|
self.qubesd_call(
|
|
self._method_dest,
|
|
self._method_prefix + 'Set',
|
|
key,
|
|
str(value).encode('utf-8'))
|
|
except qubesmgmt.exc.QubesDaemonNoResponseError:
|
|
raise qubesmgmt.exc.QubesPropertyAccessError(key)
|
|
|
|
def __delattr__(self, name):
|
|
if name.startswith('_') or name in dir(self):
|
|
return super(PropertyHolder, self).__delattr__(name)
|
|
try:
|
|
self.qubesd_call(
|
|
self._method_dest,
|
|
self._method_prefix + 'Reset',
|
|
name
|
|
)
|
|
except qubesmgmt.exc.QubesDaemonNoResponseError:
|
|
raise qubesmgmt.exc.QubesPropertyAccessError(name)
|