333 lines
12 KiB
Python
333 lines
12 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) 2010-2016 Joanna Rutkowska <joanna@invisiblethingslab.com>
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# Copyright (C) 2013-2016 Marek Marczykowski-Górecki
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# <marmarek@invisiblethingslab.com>
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# Copyright (C) 2014-2016 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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''' This module contains the NetVMMixin '''
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import re
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import libvirt # pylint: disable=import-error
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import qubes
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import qubes.events
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import qubes.exc
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def _setter_mac(self, prop, value):
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''' Helper for setting the MAC address '''
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# pylint: disable=unused-argument
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if not isinstance(value, basestring):
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raise ValueError('MAC address must be a string')
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value = value.lower()
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if re.match(r"^([0-9a-f][0-9a-f]:){5}[0-9a-f][0-9a-f]$", value) is None:
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raise ValueError('Invalid MAC address value')
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return value
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class NetVMMixin(qubes.events.Emitter):
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''' Mixin containing network functionality '''
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mac = qubes.property('mac', type=str,
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default='00:16:3E:5E:6C:00',
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setter=_setter_mac,
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ls_width=17,
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doc='MAC address of the NIC emulated inside VM')
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# CORE2: swallowed uses_default_netvm
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netvm = qubes.VMProperty('netvm', load_stage=4, allow_none=True,
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default=(lambda self: self.app.default_fw_netvm if self.provides_network
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else self.app.default_netvm),
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ls_width=31,
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doc='''VM that provides network connection to this domain. When
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`None`, machine is disconnected. When absent, domain uses default
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NetVM.''')
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provides_network = qubes.property('provides_network', default=False,
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type=bool, setter=qubes.property.bool,
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doc='''If this domain can act as network provider (formerly known as
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NetVM or ProxyVM)''')
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#
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# used in networked appvms or proxyvms (netvm is not None)
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#
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@qubes.tools.qvm_ls.column(width=15)
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@property
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def ip(self):
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'''IP address of this domain.'''
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if not self.is_networked():
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return None
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if self.netvm is not None:
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return self.netvm.get_ip_for_vm(self) # pylint: disable=no-member
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else:
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return self.get_ip_for_vm(self)
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#
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# used in netvms (provides_network=True)
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# those properties and methods are most likely accessed as vm.netvm.<prop>
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#
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@staticmethod
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def get_ip_for_vm(vm):
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'''Get IP address for (appvm) domain connected to this (netvm) domain.
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'''
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import qubes.vm.dispvm # pylint: disable=redefined-outer-name
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if isinstance(vm, qubes.vm.dispvm.DispVM):
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return '10.138.{}.{}'.format((vm.dispid >> 8) & 7, vm.dispid & 7)
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# VM technically can get address which ends in '.0'. This currently
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# does not happen, because qid < 253, but may happen in the future.
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return '10.137.{}.{}'.format((vm.qid >> 8) & 7, vm.qid & 7)
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@qubes.tools.qvm_ls.column(head='IPBACK', width=15)
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@property
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def gateway(self):
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'''Gateway for other domains that use this domain as netvm.'''
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return self.ip if self.provides_network else None
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@qubes.tools.qvm_ls.column(width=15)
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@property
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def netmask(self):
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'''Netmask for gateway address.'''
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return '255.255.255.255' if self.is_networked() else None
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@property
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def connected_vms(self):
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''' Return a generator containing all domains connected to the current
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NetVM.
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'''
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for vm in self.app.domains:
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if vm.netvm is self:
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yield vm
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#
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# used in both
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#
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@qubes.tools.qvm_ls.column(width=15)
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@property
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def dns(self):
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'''Secondary DNS server set up for this domain.'''
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if self.netvm is not None or self.provides_network:
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return (
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'10.139.1.1',
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'10.139.1.2',
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)
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else:
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return None
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def __init__(self, *args, **kwargs):
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super(NetVMMixin, self).__init__(*args, **kwargs)
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@qubes.events.handler('domain-start')
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def on_domain_started(self, event, **kwargs):
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'''Connect this domain to its downstream domains. Also reload firewall
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in its netvm.
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This is needed when starting netvm *after* its connected domains.
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''' # pylint: disable=unused-argument
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if self.netvm:
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self.netvm.reload_firewall_for_vm(self) # pylint: disable=no-member
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for vm in self.connected_vms:
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if not vm.is_running():
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continue
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vm.log.info('Attaching network')
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# SEE: 1426
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vm.cleanup_vifs()
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try:
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# 1426
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vm.run('modprobe -r xen-netfront xennet',
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user='root', wait=True)
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except: # pylint: disable=bare-except
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pass
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try:
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vm.attach_network(wait=False)
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except qubes.exc.QubesException:
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vm.log.warning('Cannot attach network', exc_info=1)
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@qubes.events.handler('domain-pre-shutdown')
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def shutdown_net(self, event, force=False):
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''' Checks before NetVM shutdown if any connected domains are running.
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If `force` is `True` tries to detach network interfaces of connected
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vms
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''' # pylint: disable=unused-argument
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connected_vms = [vm for vm in self.connected_vms if vm.is_running()]
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if connected_vms and not force:
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raise qubes.exc.QubesVMError(self,
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'There are other VMs connected to this VM: {}'.format(
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', '.join(vm.name for vm in connected_vms)))
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# SEE: 1426
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# detach network interfaces of connected VMs before shutting down,
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# otherwise libvirt will not notice it and will try to detach them
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# again (which would fail, obviously).
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# This code can be removed when #1426 got implemented
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for vm in connected_vms:
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if vm.is_running():
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try:
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vm.detach_network()
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except (qubes.exc.QubesException, libvirt.libvirtError):
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# ignore errors
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pass
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def attach_network(self):
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'''Attach network in this machine to it's netvm.'''
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if not self.is_running():
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raise qubes.exc.QubesVMNotRunningError(self)
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assert self.netvm is not None
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if not self.netvm.is_running(): # pylint: disable=no-member
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# pylint: disable=no-member
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self.log.info('Starting NetVM ({0})'.format(self.netvm.name))
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self.netvm.start()
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self.libvirt_domain.attachDevice(
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self.app.env.get_template('libvirt/devices/net.xml').render(
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vm=self))
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def detach_network(self):
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'''Detach machine from it's netvm'''
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if not self.is_running():
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raise qubes.exc.QubesVMNotRunningError(self)
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assert self.netvm is not None
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self.libvirt_domain.attachDevice(
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self.app.env.get_template('libvirt/devices/net.xml').render(
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vm=self))
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def is_networked(self):
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'''Check whether this VM can reach network (firewall notwithstanding).
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:returns: :py:obj:`True` if is machine can reach network, \
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:py:obj:`False` otherwise.
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:rtype: bool
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'''
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if self.provides_network:
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return True
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return self.netvm is not None
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def cleanup_vifs(self):
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'''Remove stale network device backends.
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Libvirt does not remove vif when backend domain is down, so we must do
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it manually. This method is one big hack for #1426.
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'''
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dev_basepath = '/local/domain/%d/device/vif' % self.xid
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for dev in self.app.vmm.xs.ls('', dev_basepath):
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# check if backend domain is alive
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backend_xid = int(self.app.vmm.xs.read('',
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'{}/{}/backend-id'.format(dev_basepath, dev)))
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if backend_xid in self.app.vmm.libvirt_conn.listDomainsID():
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# check if device is still active
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if self.app.vmm.xs.read('',
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'{}/{}/state'.format(dev_basepath, dev)) == '4':
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continue
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# remove dead device
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self.app.vmm.xs.rm('', '{}/{}'.format(dev_basepath, dev))
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def reload_firewall_for_vm(self, vm):
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''' Reload the firewall rules for the vm '''
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# SEE:1815
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pass
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@qubes.events.handler('property-del:netvm')
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def on_property_del_netvm(self, event, prop, old_netvm=None):
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''' Sets the the NetVM to default NetVM '''
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# pylint: disable=unused-argument
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# we are changing to default netvm
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new_netvm = self.netvm
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if new_netvm == old_netvm:
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return
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self.fire_event('property-set:netvm', 'netvm', new_netvm, old_netvm)
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@qubes.events.handler('property-pre-set:netvm')
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def on_property_pre_set_netvm(self, event, name, new_netvm, old_netvm=None):
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''' Run sanity checks before setting a new NetVM '''
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# pylint: disable=unused-argument
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if new_netvm is None:
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return
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if not new_netvm.provides_network:
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raise qubes.exc.QubesValueError(
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'The {!s} qube does not provide network'.format(new_netvm))
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if new_netvm is self \
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or new_netvm in self.app.domains.get_vms_connected_to(self):
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raise qubes.exc.QubesValueError('Loops in network are unsupported')
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if not self.app.vmm.offline_mode and self.is_running() \
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and not new_netvm.is_running():
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raise qubes.exc.QubesVMNotStartedError(new_netvm,
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'Cannot dynamically attach to stopped NetVM: {!r}'.format(
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new_netvm))
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@qubes.events.handler('property-set:netvm')
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def on_property_set_netvm(self, event, name, new_netvm, old_netvm=None):
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''' Replaces the current NetVM with a new one and fires
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net-domain-connect event
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'''
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# pylint: disable=unused-argument
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if self.netvm is not None:
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if self.is_running():
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self.detach_network()
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if new_netvm is None:
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return
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if self.is_running():
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# refresh IP, DNS etc
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self.create_qdb_entries()
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self.attach_network()
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new_netvm.fire_event('net-domain-connect', self) # SEE: 1811
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@qubes.events.handler('net-domain-connect')
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def on_net_domain_connect(self, event, vm):
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''' Reloads the firewall config for vm '''
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# pylint: disable=unused-argument
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self.reload_firewall_for_vm(vm)
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@qubes.events.handler('domain-qdb-create')
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def on_domain_qdb_create(self, event):
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''' Fills the QubesDB with firewall entries. Not implemented '''
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# SEE: 1815 fill firewall QubesDB entries
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pass
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@qubes.events.handler('firewall-changed', 'domain-spawn')
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def on_firewall_changed(self, event, **kwargs):
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''' Reloads the firewall if vm is running and has a NetVM assigned '''
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# pylint: disable=unused-argument
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if self.is_running() and self.netvm:
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self.netvm.reload_firewall_for_vm(self) # pylint: disable=no-member
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