145 lines
5.4 KiB
Python
145 lines
5.4 KiB
Python
# -*- encoding: utf8 -*-
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#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2017 Wojtek Porczyk <woju@invisiblethingslab.com>
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library 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 GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, see <https://www.gnu.org/licenses/>.
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import qubes.api
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import qubes.api.internal
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import qubes.ext
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import qubes.vm.adminvm
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from qrexec.policy import utils, parser
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class JustEvaluateAskResolution(parser.AskResolution):
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async def execute(self, caller_ident):
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pass
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class JustEvaluateAllowResolution(parser.AllowResolution):
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async def execute(self, caller_ident):
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pass
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class AdminExtension(qubes.ext.Extension):
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def __init__(self):
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super(AdminExtension, self).__init__()
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# during tests, __init__() of the extension can be called multiple
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# times, because there are multiple Qubes() object instances
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if not hasattr(self, 'policy_cache'):
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self.policy_cache = utils.PolicyCache(lazy_load=True)
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self.policy_cache.initialize_watcher()
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# pylint: disable=too-few-public-methods
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@qubes.ext.handler(
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'admin-permission:admin.vm.tag.Set',
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'admin-permission:admin.vm.tag.Remove')
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def on_tag_set_or_remove(self, vm, event, arg, **kwargs):
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'''Forbid changing specific tags'''
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# pylint: disable=no-self-use,unused-argument
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if arg.startswith('created-by-') and \
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not isinstance(vm, qubes.vm.adminvm.AdminVM):
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raise qubes.api.PermissionDenied(
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'changing this tag is prohibited by {}.{}'.format(
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__name__, type(self).__name__))
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# TODO create that tag here (need to figure out how to pass mgmtvm name)
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@qubes.ext.handler('admin-permission:admin.vm.List')
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def admin_vm_list(self, vm, event, arg, **kwargs):
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'''When called with target 'dom0' (aka "get full list"), exclude domains
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that the caller don't have permission to list
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'''
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# pylint: disable=unused-argument
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if vm.klass == 'AdminVM':
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# dom0 can always list everything
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return None
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policy = self.policy_cache.get_policy()
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system_info = qubes.api.internal.get_system_info(vm.app)
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def filter_vms(dest_vm):
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request = parser.Request(
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'admin.vm.List',
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'+' + arg,
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vm.name,
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dest_vm.name,
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system_info=system_info,
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ask_resolution_type=JustEvaluateAskResolution,
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allow_resolution_type=JustEvaluateAllowResolution)
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try:
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resolution = policy.evaluate(request)
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# do not consider 'ask' as allow here,
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# this needs to be not interactive
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return isinstance(resolution, parser.AllowResolution)
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except parser.AccessDenied:
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return False
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return (filter_vms,)
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@qubes.ext.handler('admin-permission:admin.Events')
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def admin_events(self, vm, event, arg, **kwargs):
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'''When called with target 'dom0' (aka "get all events"),
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exclude domains that the caller don't have permission to receive
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events about
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'''
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# pylint: disable=unused-argument
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if vm.klass == 'AdminVM':
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# dom0 can always list everything
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return None
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def filter_events(event):
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subject, event, kwargs = event
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try:
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dest = subject.name
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except AttributeError:
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# domain-add and similar events fired on the Qubes() object
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if 'vm' in kwargs:
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dest = kwargs['vm'].name
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else:
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dest = '@adminvm'
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policy = self.policy_cache.get_policy()
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# TODO: cache system_info (based on last qubes.xml write time?)
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system_info = qubes.api.internal.get_system_info(vm.app)
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request = parser.Request(
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'admin.Events',
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'+' + event.replace(':', '_'),
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vm.name,
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dest,
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system_info=system_info,
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ask_resolution_type=JustEvaluateAskResolution,
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allow_resolution_type=JustEvaluateAllowResolution)
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try:
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resolution = policy.evaluate(request)
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# do not consider 'ask' as allow here,
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# this needs to be not interactive
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return isinstance(resolution, parser.AllowResolution)
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except parser.AccessDenied:
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return False
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return (filter_events,)
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@qubes.ext.handler('qubes-close', system=True)
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def on_qubes_close(self, app, event, **kwargs):
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"""Unregister policy file watches on app.close()."""
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# pylint: disable=unused-argument
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if hasattr(self, 'policy_cache'):
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self.policy_cache.cleanup()
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del self.policy_cache
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