1511 lines
48 KiB
Python
1511 lines
48 KiB
Python
#!/usr/bin/python2 -O
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# vim: fileencoding=utf-8
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#
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# The Qubes OS Project, https://www.qubes-os.org/
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#
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# Copyright (C) 2010-2015 Joanna Rutkowska <joanna@invisiblethingslab.com>
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# Copyright (C) 2011-2015 Marek Marczykowski-Górecki
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# <marmarek@invisiblethingslab.com>
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# Copyright (C) 2014-2015 Wojtek Porczyk <woju@invisiblethingslab.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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#
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'''
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Qubes OS
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:copyright: © 2010-2015 Invisible Things Lab
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'''
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from __future__ import absolute_import
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__author__ = 'Invisible Things Lab'
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__license__ = 'GPLv2 or later'
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__version__ = 'R3'
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import ast
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import atexit
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import collections
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import errno
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import grp
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import logging
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import os
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import os.path
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import sys
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import tempfile
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import time
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import warnings
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import __builtin__
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import docutils.core
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import docutils.io
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import lxml.etree
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import qubes.config
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import qubes.events
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import qubes.exc
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import qubes.ext
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if os.name == 'posix':
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import fcntl
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elif os.name == 'nt':
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# pylint: disable=import-error
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import win32con
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import win32file
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import pywintypes
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else:
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raise RuntimeError("Qubes works only on POSIX or WinNT systems")
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import libvirt
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try:
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import xen.lowlevel.xs
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import xen.lowlevel.xc
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except ImportError:
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pass
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class VMMConnection(object):
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'''Connection to Virtual Machine Manager (libvirt)'''
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def __init__(self):
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self._libvirt_conn = None
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self._xs = None
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self._xc = None
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self._offline_mode = False
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@__builtin__.property
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def offline_mode(self):
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'''Check or enable offline mode (do not actually connect to vmm)'''
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return self._offline_mode
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@offline_mode.setter
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def offline_mode(self, value):
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if value and self._libvirt_conn is not None:
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raise qubes.exc.QubesException(
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'Cannot change offline mode while already connected')
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self._offline_mode = value
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def _libvirt_error_handler(self, ctx, error):
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pass
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def init_vmm_connection(self):
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'''Initialise connection
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This method is automatically called when getting'''
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if self._libvirt_conn is not None:
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# Already initialized
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return
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if self._offline_mode:
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# Do not initialize in offline mode
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raise qubes.exc.QubesException(
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'VMM operations disabled in offline mode')
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if 'xen.lowlevel.xs' in sys.modules:
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self._xs = xen.lowlevel.xs.xs()
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if 'xen.lowlevel.cs' in sys.modules:
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self._xc = xen.lowlevel.xc.xc()
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self._libvirt_conn = libvirt.open(qubes.config.defaults['libvirt_uri'])
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if self._libvirt_conn is None:
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raise qubes.exc.QubesException('Failed connect to libvirt driver')
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libvirt.registerErrorHandler(self._libvirt_error_handler, None)
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@__builtin__.property
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def libvirt_conn(self):
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'''Connection to libvirt'''
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self.init_vmm_connection()
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return self._libvirt_conn
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@__builtin__.property
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def xs(self):
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'''Connection to Xen Store
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This property in available only when running on Xen.
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'''
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# XXX what about the case when we run under KVM,
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# but xen modules are importable?
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if 'xen.lowlevel.xs' not in sys.modules:
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raise AttributeError(
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'xs object is available under Xen hypervisor only')
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self.init_vmm_connection()
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return self._xs
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@__builtin__.property
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def xc(self):
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'''Connection to Xen
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This property in available only when running on Xen.
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'''
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# XXX what about the case when we run under KVM,
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# but xen modules are importable?
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if 'xen.lowlevel.xc' not in sys.modules:
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raise AttributeError(
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'xc object is available under Xen hypervisor only')
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self.init_vmm_connection()
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return self._xs
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def __del__(self):
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if self._libvirt_conn:
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self._libvirt_conn.close()
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class QubesHost(object):
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'''Basic information about host machine
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:param qubes.Qubes app: Qubes application context (must have \
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:py:attr:`Qubes.vmm` attribute defined)
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'''
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def __init__(self, app):
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self.app = app
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self._no_cpus = None
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self._total_mem = None
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self._physinfo = None
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def _fetch(self):
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if self._no_cpus is not None:
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return
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# pylint: disable=unused-variable
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(model, memory, cpus, mhz, nodes, socket, cores, threads) = \
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self.app.vmm.libvirt_conn.getInfo()
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self._total_mem = long(memory) * 1024
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self._no_cpus = cpus
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self.app.log.debug('QubesHost: no_cpus={} memory_total={}'.format(
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self.no_cpus, self.memory_total))
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try:
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self.app.log.debug('QubesHost: xen_free_memory={}'.format(
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self.get_free_xen_memory()))
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except NotImplementedError:
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pass
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@__builtin__.property
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def memory_total(self):
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'''Total memory, in kbytes'''
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self._fetch()
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return self._total_mem
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@__builtin__.property
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def no_cpus(self):
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'''Number of CPUs'''
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self._fetch()
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return self._no_cpus
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def get_free_xen_memory(self):
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'''Get free memory from Xen's physinfo.
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:raises NotImplementedError: when not under Xen
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'''
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try:
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self._physinfo = self.app.xc.physinfo()
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except AttributeError:
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raise NotImplementedError('This function requires Xen hypervisor')
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return long(self._physinfo['free_memory'])
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def measure_cpu_usage(self, previous_time=None, previous=None,
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wait_time=1):
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'''Measure cpu usage for all domains at once.
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This function requires Xen hypervisor.
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.. versionchanged:: 3.0
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argument order to match return tuple
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:raises NotImplementedError: when not under Xen
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'''
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if previous is None:
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previous_time = time.time()
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previous = {}
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try:
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info = self.app.vmm.xc.domain_getinfo(0, qubes.config.max_qid)
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except AttributeError:
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raise NotImplementedError(
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'This function requires Xen hypervisor')
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for vm in info:
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previous[vm['domid']] = {}
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previous[vm['domid']]['cpu_time'] = (
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vm['cpu_time'] / vm['online_vcpus'])
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previous[vm['domid']]['cpu_usage'] = 0
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time.sleep(wait_time)
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current_time = time.time()
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current = {}
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try:
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info = self.app.vmm.xc.domain_getinfo(0, qubes.config.max_qid)
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except AttributeError:
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raise NotImplementedError(
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'This function requires Xen hypervisor')
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for vm in info:
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current[vm['domid']] = {}
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current[vm['domid']]['cpu_time'] = (
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vm['cpu_time'] / max(vm['online_vcpus'], 1))
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if vm['domid'] in previous.keys():
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current[vm['domid']]['cpu_usage'] = (
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float(current[vm['domid']]['cpu_time'] -
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previous[vm['domid']]['cpu_time']) /
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long(1000 ** 3) / (current_time - previous_time) * 100)
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if current[vm['domid']]['cpu_usage'] < 0:
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# VM has been rebooted
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current[vm['domid']]['cpu_usage'] = 0
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else:
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current[vm['domid']]['cpu_usage'] = 0
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return (current_time, current)
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class Label(object):
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'''Label definition for virtual machines
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Label specifies colour of the padlock displayed next to VM's name.
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When this is a :py:class:`qubes.vm.dispvm.DispVM`, padlock is overlayed
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with recycling pictogram.
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:param int index: numeric identificator of label
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:param str color: colour specification as in HTML (``#abcdef``)
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:param str name: label's name like "red" or "green"
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'''
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def __init__(self, index, color, name):
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#: numeric identificator of label
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self.index = index
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#: colour specification as in HTML (``#abcdef``)
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self.color = color
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#: label's name like "red" or "green"
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self.name = name
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#: freedesktop icon name, suitable for use in
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#: :py:meth:`PyQt4.QtGui.QIcon.fromTheme`
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self.icon = 'appvm-' + name
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#: freedesktop icon name, suitable for use in
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#: :py:meth:`PyQt4.QtGui.QIcon.fromTheme` on DispVMs
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self.icon_dispvm = 'dispvm-' + name
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@classmethod
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def fromxml(cls, xml):
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'''Create label definition from XML node
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:param lxml.etree._Element xml: XML node reference
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:rtype: :py:class:`qubes.Label`
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'''
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index = int(xml.get('id').split('-', 1)[1])
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color = xml.get('color')
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name = xml.text
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return cls(index, color, name)
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def __xml__(self):
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element = lxml.etree.Element(
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'label', id='label-{}'.format(self.index), color=self.color)
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element.text = self.name
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return element
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def __str__(self):
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return self.name
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def __repr__(self):
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return '{}({!r}, {!r}, {!r})'.format(
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self.__class__.__name__,
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self.index,
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self.color,
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self.name)
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@__builtin__.property
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def icon_path(self):
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'''Icon path
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.. deprecated:: 2.0
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use :py:meth:`PyQt4.QtGui.QIcon.fromTheme` and :py:attr:`icon`
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'''
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return os.path.join(qubes.config.system_path['qubes_icon_dir'],
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self.icon) + ".png"
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@__builtin__.property
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def icon_path_dispvm(self):
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'''Icon path
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.. deprecated:: 2.0
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use :py:meth:`PyQt4.QtGui.QIcon.fromTheme` and :py:attr:`icon_dispvm`
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'''
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return os.path.join(qubes.config.system_path['qubes_icon_dir'],
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self.icon_dispvm) + ".png"
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class VMCollection(object):
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'''A collection of Qubes VMs
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VMCollection supports ``in`` operator. You may test for ``qid``, ``name``
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and whole VM object's presence.
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Iterating over VMCollection will yield machine objects.
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'''
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def __init__(self, app):
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self.app = app
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self._dict = dict()
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def __repr__(self):
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return '<{} {!r}>'.format(
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self.__class__.__name__, list(sorted(self.keys())))
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def items(self):
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'''Iterate over ``(qid, vm)`` pairs'''
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for qid in self.qids():
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yield (qid, self[qid])
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def qids(self):
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'''Iterate over all qids
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qids are sorted by numerical order.
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'''
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return iter(sorted(self._dict.keys()))
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keys = qids
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def names(self):
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'''Iterate over all names
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names are sorted by lexical order.
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'''
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return iter(sorted(vm.name for vm in self._dict.values()))
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def vms(self):
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'''Iterate over all machines
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vms are sorted by qid.
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'''
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return iter(sorted(self._dict.values()))
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__iter__ = vms
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values = vms
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def add(self, value):
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'''Add VM to collection
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:param qubes.vm.BaseVM value: VM to add
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:raises TypeError: when value is of wrong type
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:raises ValueError: when there is already VM which has equal ``qid``
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'''
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# this violates duck typing, but is needed
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# for VMProperty to function correctly
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if not isinstance(value, qubes.vm.BaseVM):
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raise TypeError('{} holds only BaseVM instances'.format(
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self.__class__.__name__))
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if value.qid in self:
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raise ValueError('This collection already holds VM that has '
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'qid={!r} ({!r})'.format(value.qid, self[value.qid]))
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if value.name in self:
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raise ValueError('This collection already holds VM that has '
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'name={!r} ({!r})'.format(value.name, self[value.name]))
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self._dict[value.qid] = value
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value.events_enabled = True
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self.app.fire_event('domain-added', value)
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return value
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def __getitem__(self, key):
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if isinstance(key, int):
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return self._dict[key]
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if isinstance(key, basestring):
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for vm in self:
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if vm.name == key:
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return vm
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raise KeyError(key)
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if isinstance(key, qubes.vm.BaseVM):
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if key in self:
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return key
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raise KeyError(key)
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raise KeyError(key)
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def __delitem__(self, key):
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vm = self[key]
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del self._dict[vm.qid]
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self.app.fire_event('domain-deleted', vm)
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def __contains__(self, key):
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return any((key == vm or key == vm.qid or key == vm.name)
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for vm in self)
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def __len__(self):
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return len(self._dict)
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def get_vms_based_on(self, template):
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template = self[template]
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return set(vm for vm in self if vm.template == template)
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def get_vms_connected_to(self, netvm):
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new_vms = set([self[netvm]])
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dependent_vms = set()
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# Dependency resolving only makes sense on NetVM (or derivative)
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# if not self[netvm_qid].is_netvm():
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# return set([])
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while len(new_vms) > 0:
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cur_vm = new_vms.pop()
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for vm in cur_vm.connected_vms.values():
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if vm in dependent_vms:
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continue
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dependent_vms.add(vm.qid)
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# if vm.is_netvm():
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new_vms.add(vm.qid)
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return dependent_vms
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# XXX with Qubes Admin Api this will probably lead to race condition
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# whole process of creating and adding should be synchronised
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def get_new_unused_qid(self):
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used_ids = set(self.qids())
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for i in range(1, qubes.config.max_qid):
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if i not in used_ids:
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return i
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raise LookupError("Cannot find unused qid!")
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def get_new_unused_netid(self):
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used_ids = set([vm.netid for vm in self]) # if vm.is_netvm()])
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for i in range(1, qubes.config.max_netid):
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if i not in used_ids:
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return i
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raise LookupError("Cannot find unused netid!")
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class property(object): # pylint: disable=redefined-builtin,invalid-name
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'''Qubes property.
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This class holds one property that can be saved to and loaded from
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:file:`qubes.xml`. It is used for both global and per-VM properties.
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Property can be unset by ordinary ``del`` statement or assigning
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:py:attr:`DEFAULT` special value to it. After deletion (or before first
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assignment/load) attempting to read a property will get its default value
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or, when no default, py:class:`exceptions.AttributeError`.
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:param str name: name of the property
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:param collections.Callable setter: if not :py:obj:`None`, this is used to \
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initialise value; first parameter to the function is holder instance \
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and the second is value; this is called before ``type``
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:param collections.Callable saver: function to coerce value to something \
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readable by setter
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:param type type: if not :py:obj:`None`, value is coerced to this type
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:param object default: default value; if callable, will be called with \
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holder as first argument
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:param int load_stage: stage when property should be loaded (see \
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:py:class:`Qubes` for description of stages)
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:param int order: order of evaluation (bigger order values are later)
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:param bool clone: :py:meth:`PropertyHolder.clone_properties` will not \
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include this property by default if :py:obj:`False`
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:param str ls_head: column head for :program:`qvm-ls`
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:param int ls_width: column width in :program:`qvm-ls`
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:param str doc: docstring; this should be one paragraph of plain RST, no \
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sphinx-specific features
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Setters and savers have following signatures:
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.. :py:function:: setter(self, prop, value)
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|
:noindex:
|
|
|
|
:param self: instance of object that is holding property
|
|
:param prop: property object
|
|
:param value: value being assigned
|
|
|
|
.. :py:function:: saver(self, prop, value)
|
|
:noindex:
|
|
|
|
:param self: instance of object that is holding property
|
|
:param prop: property object
|
|
:param value: value being saved
|
|
:rtype: str
|
|
:raises property.DontSave: when property should not be saved at all
|
|
|
|
'''
|
|
|
|
#: Assigning this value to property means setting it to its default value.
|
|
#: If property has no default value, this will unset it.
|
|
DEFAULT = object()
|
|
|
|
# internal use only
|
|
_NO_DEFAULT = object()
|
|
|
|
def __init__(self, name, setter=None, saver=None, type=None,
|
|
default=_NO_DEFAULT, write_once=False, load_stage=2, order=0,
|
|
save_via_ref=False, clone=True,
|
|
ls_head=None, ls_width=None, doc=None):
|
|
# pylint: disable=redefined-builtin
|
|
self.__name__ = name
|
|
self._setter = setter
|
|
self._saver = saver if saver is not None else (
|
|
lambda self, prop, value: str(value))
|
|
self._type = type
|
|
self._default = default
|
|
self._write_once = write_once
|
|
self.order = order
|
|
self.load_stage = load_stage
|
|
self.save_via_ref = save_via_ref
|
|
self.clone = clone
|
|
self.__doc__ = doc
|
|
self._attr_name = '_qubesprop_' + name
|
|
|
|
if ls_head is not None or ls_width is not None:
|
|
self.ls_head = ls_head or self.__name__.replace('_', '-').upper()
|
|
self.ls_width = max(ls_width or 0, len(self.ls_head) + 1)
|
|
|
|
|
|
def __get__(self, instance, owner):
|
|
if instance is None:
|
|
return self
|
|
|
|
# XXX this violates duck typing, shall we keep it?
|
|
if not isinstance(instance, PropertyHolder):
|
|
raise AttributeError('qubes.property should be used on '
|
|
'qubes.PropertyHolder instances only')
|
|
|
|
try:
|
|
return getattr(instance, self._attr_name)
|
|
|
|
except AttributeError:
|
|
if self._default is self._NO_DEFAULT:
|
|
raise AttributeError(
|
|
'property {!r} not set'.format(self.__name__))
|
|
elif isinstance(self._default, collections.Callable):
|
|
return self._default(instance)
|
|
else:
|
|
return self._default
|
|
|
|
|
|
def __set__(self, instance, value):
|
|
self._enforce_write_once(instance)
|
|
|
|
if value is self.__class__.DEFAULT:
|
|
self.__delete__(instance)
|
|
return
|
|
|
|
try:
|
|
oldvalue = getattr(instance, self.__name__)
|
|
has_oldvalue = True
|
|
except AttributeError:
|
|
has_oldvalue = False
|
|
|
|
if self._setter is not None:
|
|
value = self._setter(instance, self, value)
|
|
if self._type not in (None, type(value)):
|
|
value = self._type(value)
|
|
|
|
if has_oldvalue:
|
|
instance.fire_event_pre('property-pre-set:' + self.__name__,
|
|
self.__name__, value, oldvalue)
|
|
else:
|
|
instance.fire_event_pre('property-pre-set:' + self.__name__,
|
|
self.__name__, value)
|
|
|
|
instance._property_init(self, value) # pylint: disable=protected-access
|
|
|
|
if has_oldvalue:
|
|
instance.fire_event('property-set:' + self.__name__, self.__name__,
|
|
value, oldvalue)
|
|
else:
|
|
instance.fire_event('property-set:' + self.__name__, self.__name__,
|
|
value)
|
|
|
|
|
|
def __delete__(self, instance):
|
|
self._enforce_write_once(instance)
|
|
|
|
try:
|
|
oldvalue = getattr(instance, self.__name__)
|
|
has_oldvalue = True
|
|
except AttributeError:
|
|
has_oldvalue = False
|
|
|
|
if has_oldvalue:
|
|
instance.fire_event_pre('property-pre-deleted:' + self.__name__,
|
|
self.__name__, oldvalue)
|
|
else:
|
|
instance.fire_event_pre('property-pre-deleted:' + self.__name__,
|
|
self.__name__)
|
|
|
|
delattr(instance, self._attr_name)
|
|
|
|
if has_oldvalue:
|
|
instance.fire_event('property-deleted:' + self.__name__,
|
|
self.__name__, oldvalue)
|
|
else:
|
|
instance.fire_event('property-deleted:' + self.__name__,
|
|
self.__name__)
|
|
|
|
|
|
def __repr__(self):
|
|
default = ' default={!r}'.format(self._default) \
|
|
if self._default is not self._NO_DEFAULT \
|
|
else ''
|
|
return '<{} object at {:#x} name={!r}{}>'.format(
|
|
self.__class__.__name__, id(self), self.__name__, default) \
|
|
|
|
|
|
def __hash__(self):
|
|
return hash(self.__name__)
|
|
|
|
|
|
def __eq__(self, other):
|
|
return isinstance(other, property) and self.__name__ == other.__name__
|
|
|
|
|
|
def _enforce_write_once(self, instance):
|
|
if self._write_once and not instance.property_is_default(self):
|
|
raise AttributeError(
|
|
'property {!r} is write-once and already set'.format(
|
|
self.__name__))
|
|
|
|
|
|
#
|
|
# exceptions
|
|
#
|
|
|
|
class DontSave(Exception):
|
|
'''This exception may be raised from saver to sign that property should
|
|
not be saved.
|
|
'''
|
|
pass
|
|
|
|
@staticmethod
|
|
def dontsave(self, prop, value):
|
|
'''Dummy saver that never saves anything.'''
|
|
# pylint: disable=bad-staticmethod-argument,unused-argument
|
|
raise property.DontSave()
|
|
|
|
#
|
|
# some setters provided
|
|
#
|
|
|
|
@staticmethod
|
|
def forbidden(self, prop, value):
|
|
'''Property setter that forbids loading a property.
|
|
|
|
This is used to effectively disable property in classes which inherit
|
|
unwanted property. When someone attempts to load such a property, it
|
|
|
|
:throws AttributeError: always
|
|
''' # pylint: disable=bad-staticmethod-argument,unused-argument
|
|
|
|
raise AttributeError(
|
|
'setting {} property on {} instance is forbidden'.format(
|
|
prop.__name__, self.__class__.__name__))
|
|
|
|
|
|
@staticmethod
|
|
def bool(self, prop, value):
|
|
'''Property setter for boolean properties.
|
|
|
|
It accepts (case-insensitive) ``'0'``, ``'no'`` and ``false`` as
|
|
:py:obj:`False` and ``'1'``, ``'yes'`` and ``'true'`` as
|
|
:py:obj:`True`.
|
|
''' # pylint: disable=bad-staticmethod-argument,unused-argument
|
|
|
|
if isinstance(value, basestring):
|
|
lcvalue = value.lower()
|
|
if lcvalue in ('0', 'no', 'false', 'off'):
|
|
return False
|
|
if lcvalue in ('1', 'yes', 'true', 'on'):
|
|
return True
|
|
raise ValueError(
|
|
'Invalid literal for boolean property: {!r}'.format(value))
|
|
|
|
return bool(value)
|
|
|
|
|
|
|
|
class PropertyHolder(qubes.events.Emitter):
|
|
'''Abstract class for holding :py:class:`qubes.property`
|
|
|
|
Events fired by instances of this class:
|
|
|
|
.. event:: property-load (subject, event)
|
|
|
|
Fired once after all properties are loaded from XML. Individual
|
|
``property-set`` events are not fired.
|
|
|
|
.. event:: property-set:<propname> \
|
|
(subject, event, name, newvalue[, oldvalue])
|
|
|
|
Fired when property changes state. Signature is variable,
|
|
*oldvalue* is present only if there was an old value.
|
|
|
|
:param name: Property name
|
|
:param newvalue: New value of the property
|
|
:param oldvalue: Old value of the property
|
|
|
|
.. event:: property-pre-set:<propname> \
|
|
(subject, event, name, newvalue[, oldvalue])
|
|
|
|
Fired before property changes state. Signature is variable,
|
|
*oldvalue* is present only if there was an old value.
|
|
|
|
:param name: Property name
|
|
:param newvalue: New value of the property
|
|
:param oldvalue: Old value of the property
|
|
|
|
.. event:: property-del:<propname> \
|
|
(subject, event, name[, oldvalue])
|
|
|
|
Fired when property gets deleted (is set to default). Signature is
|
|
variable, *oldvalue* is present only if there was an old value.
|
|
|
|
:param name: Property name
|
|
:param oldvalue: Old value of the property
|
|
|
|
.. event:: property-pre-del:<propname> \
|
|
(subject, event, name[, oldvalue])
|
|
|
|
Fired before property gets deleted (is set to default). Signature
|
|
is variable, *oldvalue* is present only if there was an old value.
|
|
|
|
:param name: Property name
|
|
:param oldvalue: Old value of the property
|
|
|
|
Members:
|
|
'''
|
|
|
|
def __init__(self, xml, **kwargs):
|
|
self.xml = xml
|
|
|
|
propvalues = {}
|
|
|
|
all_names = set(prop.__name__ for prop in self.property_list())
|
|
for key in list(kwargs.keys()):
|
|
if not key in all_names:
|
|
continue
|
|
propvalues[key] = kwargs.pop(key)
|
|
|
|
super(PropertyHolder, self).__init__(**kwargs)
|
|
|
|
for key, value in propvalues.items():
|
|
setattr(self, key, value)
|
|
|
|
|
|
@classmethod
|
|
def property_list(cls, load_stage=None):
|
|
'''List all properties attached to this VM's class
|
|
|
|
:param load_stage: Filter by load stage
|
|
:type load_stage: :py:func:`int` or :py:obj:`None`
|
|
'''
|
|
|
|
props = set()
|
|
for class_ in cls.__mro__:
|
|
props.update(prop for prop in class_.__dict__.values()
|
|
if isinstance(prop, property))
|
|
if load_stage is not None:
|
|
props = set(prop for prop in props
|
|
if prop.load_stage == load_stage)
|
|
return sorted(props,
|
|
key=lambda prop: (prop.load_stage, prop.order, prop.__name__))
|
|
|
|
|
|
def _property_init(self, prop, value):
|
|
'''Initialise property to a given value, without side effects.
|
|
|
|
:param qubes.property prop: property object of particular interest
|
|
:param value: value
|
|
'''
|
|
|
|
# pylint: disable=protected-access
|
|
setattr(self, self.property_get_def(prop)._attr_name, value)
|
|
|
|
|
|
def property_is_default(self, prop):
|
|
'''Check whether property is in it's default value.
|
|
|
|
Properties when unset may return some default value, so
|
|
``hasattr(vm, prop.__name__)`` is wrong in some circumstances. This
|
|
method allows for checking if the value returned is in fact it's
|
|
default value.
|
|
|
|
:param qubes.property prop: property object of particular interest
|
|
:rtype: bool
|
|
''' # pylint: disable=protected-access
|
|
|
|
# both property_get_def() and ._attr_name may throw AttributeError,
|
|
# which we don't want to catch
|
|
attrname = self.property_get_def(prop)._attr_name
|
|
return not hasattr(self, attrname)
|
|
|
|
|
|
@classmethod
|
|
def property_get_def(cls, prop):
|
|
'''Return property definition object.
|
|
|
|
If prop is already :py:class:`qubes.property` instance, return the same
|
|
object.
|
|
|
|
:param prop: property object or name
|
|
:type prop: qubes.property or str
|
|
:rtype: qubes.property
|
|
'''
|
|
|
|
if isinstance(prop, qubes.property):
|
|
return prop
|
|
|
|
for p in cls.property_list():
|
|
if p.__name__ == prop:
|
|
return p
|
|
|
|
raise AttributeError('No property {!r} found in {!r}'.format(
|
|
prop, cls))
|
|
|
|
|
|
def load_properties(self, load_stage=None):
|
|
'''Load properties from immediate children of XML node.
|
|
|
|
``property-set`` events are not fired for each individual property.
|
|
|
|
:param int load_stage: Stage of loading.
|
|
'''
|
|
|
|
if self.xml is None:
|
|
return
|
|
all_names = set(
|
|
prop.__name__ for prop in self.property_list(load_stage))
|
|
for node in self.xml.xpath('./properties/property'):
|
|
name = node.get('name')
|
|
value = node.get('ref') or node.text
|
|
|
|
if not name in all_names:
|
|
continue
|
|
|
|
setattr(self, name, value)
|
|
|
|
|
|
def xml_properties(self, with_defaults=False):
|
|
'''Iterator that yields XML nodes representing set properties.
|
|
|
|
:param bool with_defaults: If :py:obj:`True`, then it also includes \
|
|
properties which were not set explicite, but have default values \
|
|
filled.
|
|
'''
|
|
|
|
|
|
properties = lxml.etree.Element('properties')
|
|
|
|
for prop in self.property_list():
|
|
# pylint: disable=protected-access
|
|
try:
|
|
value = getattr(
|
|
self, (prop.__name__ if with_defaults else prop._attr_name))
|
|
except AttributeError:
|
|
continue
|
|
|
|
try:
|
|
value = prop._saver(self, prop, value)
|
|
except property.DontSave:
|
|
continue
|
|
|
|
element = lxml.etree.Element('property', name=prop.__name__)
|
|
if prop.save_via_ref:
|
|
element.set('ref', value)
|
|
else:
|
|
element.text = value
|
|
properties.append(element)
|
|
|
|
return properties
|
|
|
|
|
|
# this was clone_attrs
|
|
def clone_properties(self, src, proplist=None):
|
|
'''Clone properties from other object.
|
|
|
|
:param PropertyHolder src: source object
|
|
:param list proplist: list of properties \
|
|
(:py:obj:`None` or omit for all properties except those with \
|
|
:py:attr:`property.clone` set to :py:obj:`False`)
|
|
'''
|
|
|
|
if proplist is None:
|
|
proplist = [prop for prop in self.property_list()
|
|
if prop.clone]
|
|
else:
|
|
proplist = [prop for prop in self.property_list()
|
|
if prop.__name__ in proplist or prop in proplist]
|
|
|
|
for prop in proplist:
|
|
try:
|
|
# pylint: disable=protected-access
|
|
self._property_init(prop, getattr(src, prop._attr_name))
|
|
except AttributeError:
|
|
continue
|
|
|
|
self.fire_event('cloned-properties', src, proplist)
|
|
|
|
|
|
def property_require(self, prop, allow_none=False, hard=False):
|
|
'''Complain badly when property is not set.
|
|
|
|
:param prop: property name or object
|
|
:type prop: qubes.property or str
|
|
:param bool allow_none: if :py:obj:`True`, don't complain if \
|
|
:py:obj:`None` is found
|
|
:param bool hard: if :py:obj:`True`, raise :py:class:`AssertionError`; \
|
|
if :py:obj:`False`, log warning instead
|
|
'''
|
|
|
|
if isinstance(prop, qubes.property):
|
|
prop = prop.__name__
|
|
|
|
try:
|
|
value = getattr(self, prop)
|
|
if value is None and not allow_none:
|
|
raise AttributeError()
|
|
except AttributeError:
|
|
# pylint: disable=no-member
|
|
msg = 'Required property {!r} not set on {!r}'.format(prop, self)
|
|
if hard:
|
|
raise AssertionError(msg)
|
|
else:
|
|
# pylint: disable=no-member
|
|
self.log.fatal(msg)
|
|
|
|
|
|
import qubes.vm
|
|
|
|
|
|
class VMProperty(property):
|
|
'''Property that is referring to a VM
|
|
|
|
:param type vmclass: class that returned VM is supposed to be instance of
|
|
|
|
and all supported by :py:class:`property` with the exception of ``type`` \
|
|
and ``setter``
|
|
'''
|
|
|
|
_none_value = ''
|
|
|
|
def __init__(self, name, vmclass=qubes.vm.BaseVM, allow_none=False,
|
|
**kwargs):
|
|
if 'type' in kwargs:
|
|
raise TypeError(
|
|
"'type' keyword parameter is unsupported in {}".format(
|
|
self.__class__.__name__))
|
|
if 'setter' in kwargs:
|
|
raise TypeError(
|
|
"'setter' keyword parameter is unsupported in {}".format(
|
|
self.__class__.__name__))
|
|
if not issubclass(vmclass, qubes.vm.BaseVM):
|
|
raise TypeError(
|
|
"'vmclass' should specify a subclass of qubes.vm.BaseVM")
|
|
|
|
super(VMProperty, self).__init__(name,
|
|
saver=(lambda self_, prop, value:
|
|
self._none_value if value is None else value.name),
|
|
**kwargs)
|
|
self.vmclass = vmclass
|
|
self.allow_none = allow_none
|
|
|
|
|
|
def __set__(self, instance, value):
|
|
if value == self._none_value:
|
|
value = None
|
|
if value is None:
|
|
if self.allow_none:
|
|
super(VMProperty, self).__set__(instance, value)
|
|
return
|
|
else:
|
|
raise ValueError(
|
|
'Property {!r} does not allow setting to {!r}'.format(
|
|
self.__name__, value))
|
|
|
|
app = instance if isinstance(instance, Qubes) else instance.app
|
|
|
|
try:
|
|
vm = app.domains[value]
|
|
except KeyError:
|
|
raise qubes.exc.QubesVMNotFoundError(value)
|
|
|
|
if not isinstance(vm, self.vmclass):
|
|
raise TypeError('wrong VM class: domains[{!r}] if of type {!s} '
|
|
'and not {!s}'.format(value,
|
|
vm.__class__.__name__,
|
|
self.vmclass.__name__))
|
|
|
|
super(VMProperty, self).__set__(instance, vm)
|
|
|
|
|
|
import qubes.vm.qubesvm
|
|
import qubes.vm.templatevm
|
|
|
|
class Qubes(PropertyHolder):
|
|
'''Main Qubes application
|
|
|
|
:param str store: path to ``qubes.xml``
|
|
|
|
The store is loaded in stages:
|
|
|
|
1. In the first stage there are loaded some basic features from store
|
|
(currently labels).
|
|
|
|
2. In the second stage stubs for all VMs are loaded. They are filled
|
|
with their basic properties, like ``qid`` and ``name``.
|
|
|
|
3. In the third stage all global properties are loaded. They often
|
|
reference VMs, like default netvm, so they should be filled after
|
|
loading VMs.
|
|
|
|
4. In the fourth stage all remaining VM properties are loaded. They
|
|
also need all VMs loaded, because they represent dependencies
|
|
between VMs like aforementioned netvm.
|
|
|
|
5. In the fifth stage there are some fixups to ensure sane system
|
|
operation.
|
|
|
|
This class emits following events:
|
|
|
|
.. event:: domain-added (subject, event, vm)
|
|
|
|
When domain is added.
|
|
|
|
:param subject: Event emitter
|
|
:param event: Event name (``'domain-added'``)
|
|
:param vm: Domain object
|
|
|
|
.. event:: domain-deleted (subject, event, vm)
|
|
|
|
When domain is deleted. VM still has reference to ``app`` object,
|
|
but is not contained within VMCollection.
|
|
|
|
:param subject: Event emitter
|
|
:param event: Event name (``'domain-deleted'``)
|
|
:param vm: Domain object
|
|
|
|
Methods and attributes:
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'''
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default_netvm = VMProperty('default_netvm', load_stage=3,
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default=None, allow_none=True,
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doc='''Default NetVM for AppVMs. Initial state is `None`, which means
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that AppVMs are not connected to the Internet.''')
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default_fw_netvm = VMProperty('default_fw_netvm', load_stage=3,
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default=None, allow_none=True,
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doc='''Default NetVM for ProxyVMs. Initial state is `None`, which means
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that ProxyVMs (including FirewallVM) are not connected to the
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Internet.''')
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default_template = VMProperty('default_template', load_stage=3,
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vmclass=qubes.vm.templatevm.TemplateVM,
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doc='Default template for new AppVMs')
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updatevm = VMProperty('updatevm', load_stage=3,
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allow_none=True,
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doc='''Which VM to use as `yum` proxy for updating AdminVM and
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TemplateVMs''')
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clockvm = VMProperty('clockvm', load_stage=3,
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allow_none=True,
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doc='Which VM to use as NTP proxy for updating AdminVM')
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default_kernel = property('default_kernel', load_stage=3,
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doc='Which kernel to use when not overriden in VM')
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# TODO #1637 #892
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check_updates_vm = property('check_updates_vm',
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type=bool, setter=property.bool,
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default=True,
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doc='check for updates inside qubes')
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def __init__(self, store=None, load=True, **kwargs):
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#: logger instance for logging global messages
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self.log = logging.getLogger('app')
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# pylint: disable=no-member
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self._extensions = set(
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ext(self) for ext in qubes.ext.Extension.register.values())
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#: collection of all VMs managed by this Qubes instance
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self.domains = VMCollection(self)
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#: collection of all available labels for VMs
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self.labels = {}
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#: Connection to VMM
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self.vmm = VMMConnection()
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#: Information about host system
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self.host = QubesHost(self)
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if store is not None:
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self._store = store
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else:
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self._store = os.environ.get('QUBES_XML_PATH',
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os.path.join(
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qubes.config.system_path['qubes_base_dir'],
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qubes.config.system_path['qubes_store_filename']))
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super(Qubes, self).__init__(xml=None, **kwargs)
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self.__load_timestamp = None
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if load:
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self.load()
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self.events_enabled = True
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def load(self):
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'''Open qubes.xml
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:throws EnvironmentError: failure on parsing store
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:throws xml.parsers.expat.ExpatError: failure on parsing store
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:raises lxml.etree.XMLSyntaxError: on syntax error in qubes.xml
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'''
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fd = os.open(self._store, os.O_RDWR) # no O_CREAT
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fh = os.fdopen(fd, 'rb')
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if os.name == 'posix':
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fcntl.lockf(fh, fcntl.LOCK_EX)
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elif os.name == 'nt':
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# pylint: disable=protected-access
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win32file.LockFileEx(
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win32file._get_osfhandle(fh.fileno()),
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win32con.LOCKFILE_EXCLUSIVE_LOCK,
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0, -0x10000,
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pywintypes.OVERLAPPED())
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self.xml = lxml.etree.parse(fh)
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# stage 1: load labels
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for node in self.xml.xpath('./labels/label'):
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label = Label.fromxml(node)
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self.labels[label.index] = label
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# stage 2: load VMs
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for node in self.xml.xpath('./domains/domain'):
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# pylint: disable=no-member
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cls = qubes.vm.BaseVM.register[node.get('class')]
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vm = cls(self, node)
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vm.load_properties(load_stage=2)
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vm.init_log()
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self.domains.add(vm)
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if not 0 in self.domains:
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self.domains.add(qubes.vm.adminvm.AdminVM(
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self, None, qid=0, name='dom0'))
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# stage 3: load global properties
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self.load_properties(load_stage=3)
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# stage 4: fill all remaining VM properties
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for vm in self.domains:
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vm.load_properties(load_stage=4)
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# stage 5: misc fixups
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self.property_require('default_fw_netvm', allow_none=True)
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self.property_require('default_netvm', allow_none=True)
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self.property_require('default_template')
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self.property_require('clockvm', allow_none=True)
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self.property_require('updatevm', allow_none=True)
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# Disable ntpd in ClockVM - to not conflict with ntpdate (both are
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# using 123/udp port)
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if hasattr(self, 'clockvm') and self.clockvm is not None:
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if 'ntpd' in self.clockvm.services:
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if self.clockvm.services['ntpd']:
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self.log.warning("VM set as clockvm ({!r}) has enabled "
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"'ntpd' service! Expect failure when syncing time in "
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"dom0.".format(self.clockvm))
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else:
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self.clockvm.services['ntpd'] = False
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for vm in self.domains:
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vm.events_enabled = True
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vm.fire_event('domain-loaded')
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# get a file timestamp (before closing it - still holding the lock!),
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# to detect whether anyone else have modified it in the meantime
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self.__load_timestamp = os.path.getmtime(self._store)
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# intentionally do not call explicit unlock
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fh.close()
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del fh
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def __xml__(self):
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element = lxml.etree.Element('qubes')
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element.append(self.xml_labels())
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element.append(self.xml_properties())
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domains = lxml.etree.Element('domains')
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for vm in self.domains:
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domains.append(vm.__xml__())
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element.append(domains)
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return element
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def save(self):
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'''Save all data to qubes.xml
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There are several problems with saving :file:`qubes.xml` which must be
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mitigated:
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- Running out of disk space. No space left should not result in empty
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file. This is done by writing to temporary file and then renaming.
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- Attempts to write two or more files concurrently. This is done by
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sophisticated locking.
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:throws EnvironmentError: failure on saving
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'''
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while True:
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fd_old = os.open(self._store, os.O_RDWR | os.O_CREAT)
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if os.name == 'posix':
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fcntl.lockf(fd_old, fcntl.LOCK_EX)
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elif os.name == 'nt':
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# pylint: disable=protected-access
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overlapped = pywintypes.OVERLAPPED()
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win32file.LockFileEx(
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win32file._get_osfhandle(fd_old),
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win32con.LOCKFILE_EXCLUSIVE_LOCK, 0, -0x10000, overlapped)
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# While we were waiting for lock, someone could have unlink()ed (or
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# rename()d) our file out of the filesystem. We have to ensure we
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# got lock on something linked to filesystem. If not, try again.
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if os.fstat(fd_old) == os.stat(self._store):
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break
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else:
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os.close(fd_old)
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if self.__load_timestamp:
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current_file_timestamp = os.path.getmtime(self._store)
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if current_file_timestamp != self.__load_timestamp:
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os.close(fd_old)
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raise qubes.exc.QubesException(
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"Someone else modified qubes.xml in the meantime")
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fh_new = tempfile.NamedTemporaryFile(prefix=self._store, delete=False)
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lxml.etree.ElementTree(self.__xml__()).write(
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fh_new, encoding='utf-8', pretty_print=True)
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fh_new.flush()
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os.chmod(fh_new.name, 0660)
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os.chown(fh_new.name, -1, grp.getgrnam('qubes').gr_gid)
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os.rename(fh_new.name, self._store)
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# intentionally do not call explicit unlock to not unlock the file
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# before all buffers are flushed
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fh_new.close()
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# update stored mtime, in case of multiple save() calls without
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# loading qubes.xml again
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self.__load_timestamp = os.path.getmtime(self._store)
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os.close(fd_old)
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@classmethod
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def create_empty_store(cls, *args, **kwargs):
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self = cls(*args, load=False, **kwargs)
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self.labels = {
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1: Label(1, '0xcc0000', 'red'),
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2: Label(2, '0xf57900', 'orange'),
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3: Label(3, '0xedd400', 'yellow'),
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4: Label(4, '0x73d216', 'green'),
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5: Label(5, '0x555753', 'gray'),
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6: Label(6, '0x3465a4', 'blue'),
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7: Label(7, '0x75507b', 'purple'),
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8: Label(8, '0x000000', 'black'),
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}
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self.domains.add(
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qubes.vm.adminvm.AdminVM(self, None, qid=0, name='dom0'))
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self.save()
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return self
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def xml_labels(self):
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'''Serialise labels
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:rtype: lxml.etree._Element
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'''
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labels = lxml.etree.Element('labels')
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for label in sorted(self.labels.values(), key=lambda labl: labl.index):
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labels.append(label.__xml__())
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return labels
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def add_new_vm(self, cls, qid=None, **kwargs):
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'''Add new Virtual Machine to colletion
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'''
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if qid is None:
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qid = self.domains.get_new_unused_qid()
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# handle default template; specifically allow template=None (do not
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# override it with default template)
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if 'template' not in kwargs and hasattr(cls, 'template'):
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kwargs['template'] = self.default_template
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return self.domains.add(cls(self, None, qid=qid, **kwargs))
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def get_label(self, label):
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'''Get label as identified by index or name
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:throws KeyError: when label is not found
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'''
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# first search for index, verbatim
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try:
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return self.labels[label]
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except KeyError:
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pass
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# then search for name
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for i in self.labels.values():
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if i.name == label:
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return i
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# last call, if label is a number represented as str, search in indices
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try:
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return self.labels[int(label)]
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except (KeyError, ValueError):
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pass
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raise KeyError(label)
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@qubes.events.handler('domain-pre-deleted')
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def on_domain_pre_deleted(self, event, vm):
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# pylint: disable=unused-argument
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if isinstance(vm, qubes.vm.templatevm.TemplateVM):
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appvms = self.domains.get_vms_based_on(vm)
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if appvms:
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raise qubes.exc.QubesException(
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'Cannot remove template that has dependent AppVMs. '
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'Affected are: {}'.format(', '.join(
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vm.name for name in sorted(appvms))))
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@qubes.events.handler('domain-deleted')
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def on_domain_deleted(self, event, vm):
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# pylint: disable=unused-argument
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for propname in (
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'default_netvm',
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'default_fw_netvm',
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'clockvm',
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'updatevm',
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'default_template',
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):
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try:
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if getattr(self, propname) == vm:
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delattr(self, propname)
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except AttributeError:
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pass
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@qubes.events.handler('property-pre-set:clockvm')
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def on_property_pre_set_clockvm(self, event, name, newvalue, oldvalue=None):
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# pylint: disable=unused-argument,no-self-use
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if newvalue is None:
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return
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if 'ntpd' in newvalue.services:
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if newvalue.services['ntpd']:
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raise qubes.exc.QubesVMError(newvalue,
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'Cannot set {!r} as {!r} since it has ntpd enabled.'.format(
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newvalue.name, name))
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else:
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newvalue.services['ntpd'] = False
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@qubes.events.handler(
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'property-pre-set:default_netvm',
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'property-pre-set:default_fw_netvm')
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def on_property_pre_set_default_netvm(self, event, name, newvalue,
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oldvalue=None):
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# pylint: disable=unused-argument,invalid-name
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if newvalue is not None and oldvalue is not None \
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and oldvalue.is_running() and not newvalue.is_running() \
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and self.domains.get_vms_connected_to(oldvalue):
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raise qubes.exc.QubesVMNotRunningError(newvalue,
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'Cannot change {!r} to domain that '
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'is not running ({!r}).'.format(name, newvalue.name))
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@qubes.events.handler('property-set:default_fw_netvm')
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def on_property_set_default_fw_netvm(self, event, name, newvalue,
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oldvalue=None):
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# pylint: disable=unused-argument,invalid-name
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for vm in self.domains:
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if not vm.provides_network and vm.property_is_default('netvm'):
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# fire property-del:netvm as it is responsible for resetting
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# netvm to it's default value
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vm.fire_event('property-del:netvm', 'netvm', newvalue, oldvalue)
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|
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@qubes.events.handler('property-set:default_netvm')
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def on_property_set_default_netvm(self, event, name, newvalue,
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oldvalue=None):
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# pylint: disable=unused-argument
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for vm in self.domains:
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if vm.provides_network and vm.property_is_default('netvm'):
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# fire property-del:netvm as it is responsible for resetting
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# netvm to it's default value
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vm.fire_event('property-del:netvm', 'netvm', newvalue, oldvalue)
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# load plugins
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import qubes._pluginloader
|