111 lines
3.8 KiB
Python
111 lines
3.8 KiB
Python
#!/usr/bin/env python2
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# -*- 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) 2016 Bahtiar `kalkin-` Gadimov <bahtiar@gadimov.de>
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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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''' Manages block devices in a domain '''
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import string # pylint: disable=deprecated-module
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from qubes.storage import Pool, Volume
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class DomainPool(Pool):
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''' This pool manages all the block devices of a domain.
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The devices are queried through :py:module:`qubesdb`
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'''
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driver = 'domain'
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def __init__(self, vm):
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self.vm = vm
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super(DomainPool, self).__init__(name='p_' + vm.name)
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@property
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def volumes(self):
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''' Queries qubesdb and returns volumes for `self.vm` '''
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qdb = self.vm.qdb
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safe_set = set(string.letters + string.digits + string.punctuation)
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allowed_attributes = {'desc': string.printable,
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'mode': string.letters,
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'size': string.digits}
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if not self.vm.is_running():
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return []
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untrusted_qubes_devices = qdb.list('/qubes-block-devices/')
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# because we get each path 3 x times as
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# /qubes-block-devices/foo/{desc,mode,size} we need to merge this
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devices = {}
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for untrusted_device_path in untrusted_qubes_devices:
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if not all(c in safe_set for c in untrusted_device_path):
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msg = ("%s vm's device path name contains unsafe characters. "
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"Skipping it.")
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self.vm.log.warning(msg % self.vm.name)
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continue
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# name can be trusted because it was checked as a part of
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# untrusted_device_path check above
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_, _, name, untrusted_atr = untrusted_device_path.split('/', 4)
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if untrusted_atr in allowed_attributes.keys():
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atr = untrusted_atr
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else:
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msg = ('{!s} has an unknown qubes-block-device atr {!s} '
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'Skipping it')
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self.vm.log.error(msg.format(self.vm.name, untrusted_atr))
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continue
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untrusted_value = qdb.read(untrusted_device_path)
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allowed_characters = allowed_attributes[atr]
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if all(c in allowed_characters for c in untrusted_value):
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value = untrusted_value
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else:
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msg = ("{!s} vm's device path {!s} contains unsafe characters")
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self.vm.log.error(msg.format(self.vm.name, atr))
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continue
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if name not in devices.keys():
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devices[name] = {}
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devices[name][atr] = value
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return [DomainVolume(n, self.name, **atrs)
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for n, atrs in devices.items()]
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def clone(self, source, target):
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raise NotImplementedError
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def __xml__(self):
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return None
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class DomainVolume(Volume):
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''' A volume provided by a block device in an domain '''
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def __init__(self, name, pool, desc, mode, **kwargs):
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rw = (mode == 'w')
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super(DomainVolume, self).__init__(desc, pool, vid=name, removable=True,
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rw=rw, **kwargs)
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@property
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def revisions(self):
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return {}
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