2468 lines
98 KiB
Python
2468 lines
98 KiB
Python
#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2013-2015 Marek Marczykowski-Górecki
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# <marmarek@invisiblethingslab.com>
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# Copyright (C) 2013 Olivier Médoc <o_medoc@yahoo.fr>
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (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
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# along with this program. If not, see <http://www.gnu.org/licenses/>
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#
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#
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from __future__ import unicode_literals
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import itertools
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import logging
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import functools
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from qubes.utils import size_to_human
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import sys
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import stat
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import os
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import fcntl
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import subprocess
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import re
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import shutil
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import tempfile
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import time
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import grp
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import pwd
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import errno
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import datetime
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from multiprocessing import Queue, Process
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import qubes
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import qubes.core2migration
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import qubes.storage
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import qubes.storage.file
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QUEUE_ERROR = "ERROR"
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QUEUE_FINISHED = "FINISHED"
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HEADER_FILENAME = 'backup-header'
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DEFAULT_CRYPTO_ALGORITHM = 'aes-256-cbc'
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DEFAULT_HMAC_ALGORITHM = 'SHA512'
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DEFAULT_COMPRESSION_FILTER = 'gzip'
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CURRENT_BACKUP_FORMAT_VERSION = '4'
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# Maximum size of error message get from process stderr (including VM process)
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MAX_STDERR_BYTES = 1024
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# header + qubes.xml max size
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HEADER_QUBES_XML_MAX_SIZE = 1024 * 1024
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BLKSIZE = 512
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_re_alphanum = re.compile(r'^[A-Za-z0-9-]*$')
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class BackupCanceledError(qubes.exc.QubesException):
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def __init__(self, msg, tmpdir=None):
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super(BackupCanceledError, self).__init__(msg)
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self.tmpdir = tmpdir
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class BackupHeader(object):
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header_keys = {
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'version': 'version',
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'encrypted': 'encrypted',
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'compressed': 'compressed',
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'compression-filter': 'compression_filter',
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'crypto-algorithm': 'crypto_algorithm',
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'hmac-algorithm': 'hmac_algorithm',
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'backup-id': 'backup_id'
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}
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bool_options = ['encrypted', 'compressed']
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int_options = ['version']
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def __init__(self,
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header_data=None,
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version=None,
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encrypted=None,
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compressed=None,
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compression_filter=None,
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hmac_algorithm=None,
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crypto_algorithm=None,
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backup_id=None):
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# repeat the list to help code completion...
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self.version = version
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self.encrypted = encrypted
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self.compressed = compressed
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# Options introduced in backup format 3+, which always have a header,
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# so no need for fallback in function parameter
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self.compression_filter = compression_filter
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self.hmac_algorithm = hmac_algorithm
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self.crypto_algorithm = crypto_algorithm
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self.backup_id = backup_id
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if header_data is not None:
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self.load(header_data)
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def load(self, untrusted_header_text):
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"""Parse backup header file.
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:param untrusted_header_text: header content
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:type untrusted_header_text: basestring
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.. warning::
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This function may be exposed to not yet verified header,
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so is security critical.
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"""
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try:
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untrusted_header_text = untrusted_header_text.decode('ascii')
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except UnicodeDecodeError:
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raise qubes.exc.QubesException(
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"Non-ASCII characters in backup header")
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for untrusted_line in untrusted_header_text.splitlines():
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if untrusted_line.count('=') != 1:
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raise qubes.exc.QubesException("Invalid backup header")
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key, value = untrusted_line.strip().split('=', 1)
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if not _re_alphanum.match(key):
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raise qubes.exc.QubesException("Invalid backup header (key)")
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if key not in self.header_keys.keys():
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# Ignoring unknown option
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continue
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if not _re_alphanum.match(value):
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raise qubes.exc.QubesException("Invalid backup header (value)")
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if getattr(self, self.header_keys[key]) is not None:
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raise qubes.exc.QubesException(
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"Duplicated header line: {}".format(key))
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if key in self.bool_options:
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value = value.lower() in ["1", "true", "yes"]
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elif key in self.int_options:
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value = int(value)
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setattr(self, self.header_keys[key], value)
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self.validate()
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def validate(self):
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if self.version == 1:
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# header not really present
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pass
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elif self.version in [2, 3, 4]:
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expected_attrs = ['version', 'encrypted', 'compressed',
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'hmac_algorithm']
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if self.encrypted:
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expected_attrs += ['crypto_algorithm']
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if self.version >= 3 and self.compressed:
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expected_attrs += ['compression_filter']
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if self.version >= 4:
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expected_attrs += ['backup_id']
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for key in expected_attrs:
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if getattr(self, key) is None:
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raise qubes.exc.QubesException(
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"Backup header lack '{}' info".format(key))
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else:
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raise qubes.exc.QubesException(
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"Unsupported backup version {}".format(self.version))
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def save(self, filename):
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with open(filename, "w") as f:
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# make sure 'version' is the first key
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f.write('version={}\n'.format(self.version))
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for key, attr in self.header_keys.items():
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if key == 'version':
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continue
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if getattr(self, attr) is None:
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continue
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f.write("{!s}={!s}\n".format(key, getattr(self, attr)))
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class SendWorker(Process):
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def __init__(self, queue, base_dir, backup_stdout):
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super(SendWorker, self).__init__()
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self.queue = queue
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self.base_dir = base_dir
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self.backup_stdout = backup_stdout
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self.log = logging.getLogger('qubes.backup')
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def run(self):
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self.log.debug("Started sending thread")
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self.log.debug("Moving to temporary dir".format(self.base_dir))
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os.chdir(self.base_dir)
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for filename in iter(self.queue.get, None):
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if filename in (QUEUE_FINISHED, QUEUE_ERROR):
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break
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self.log.debug("Sending file {}".format(filename))
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# This tar used for sending data out need to be as simple, as
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# simple, as featureless as possible. It will not be
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# verified before untaring.
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tar_final_cmd = ["tar", "-cO", "--posix",
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"-C", self.base_dir, filename]
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final_proc = subprocess.Popen(tar_final_cmd,
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stdin=subprocess.PIPE,
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stdout=self.backup_stdout)
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if final_proc.wait() >= 2:
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if self.queue.full():
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# if queue is already full, remove some entry to wake up
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# main thread, so it will be able to notice error
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self.queue.get()
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# handle only exit code 2 (tar fatal error) or
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# greater (call failed?)
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raise qubes.exc.QubesException(
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"ERROR: Failed to write the backup, out of disk space? "
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"Check console output or ~/.xsession-errors for details.")
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# Delete the file as we don't need it anymore
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self.log.debug("Removing file {}".format(filename))
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os.remove(filename)
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self.log.debug("Finished sending thread")
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class Backup(object):
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class FileToBackup(object):
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def __init__(self, file_path, subdir=None, name=None):
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sz = qubes.storage.file.get_disk_usage(file_path)
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if subdir is None:
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abs_file_path = os.path.abspath(file_path)
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abs_base_dir = os.path.abspath(
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qubes.config.system_path["qubes_base_dir"]) + '/'
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abs_file_dir = os.path.dirname(abs_file_path) + '/'
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(nothing, directory, subdir) = abs_file_dir.partition(abs_base_dir)
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assert nothing == ""
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assert directory == abs_base_dir
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else:
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if len(subdir) > 0 and not subdir.endswith('/'):
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subdir += '/'
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#: real path to the file
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self.path = file_path
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#: size of the file
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self.size = sz
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#: directory in backup archive where file should be placed
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self.subdir = subdir
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#: use this name in the archive (aka rename)
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self.name = os.path.basename(file_path)
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if name is not None:
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self.name = name
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class VMToBackup(object):
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def __init__(self, vm, files, subdir):
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self.vm = vm
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self.files = files
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self.subdir = subdir
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@property
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def size(self):
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return functools.reduce(lambda x, y: x + y.size, self.files, 0)
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def __init__(self, app, vms_list=None, exclude_list=None, **kwargs):
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"""
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If vms = None, include all (sensible) VMs;
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exclude_list is always applied
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"""
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super(Backup, self).__init__()
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#: progress of the backup - bytes handled of the current VM
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self.chunk_size = 100 * 1024 * 1024
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self._current_vm_bytes = 0
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#: progress of the backup - bytes handled of finished VMs
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self._done_vms_bytes = 0
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#: total backup size (set by :py:meth:`get_files_to_backup`)
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self.total_backup_bytes = 0
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#: application object
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self.app = app
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#: directory for temporary files - set after creating the directory
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self.tmpdir = None
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# Backup settings - defaults
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#: should the backup be encrypted?
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self.encrypted = True
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#: should the backup be compressed?
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self.compressed = True
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#: what passphrase should be used to intergrity protect (and encrypt)
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#: the backup; required
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self.passphrase = None
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#: custom hmac algorithm
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self.hmac_algorithm = DEFAULT_HMAC_ALGORITHM
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#: custom encryption algorithm
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self.crypto_algorithm = DEFAULT_CRYPTO_ALGORITHM
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#: custom compression filter; a program which process stdin to stdout
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self.compression_filter = DEFAULT_COMPRESSION_FILTER
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#: VM to which backup should be sent (if any)
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self.target_vm = None
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#: directory to save backup in (either in dom0 or target VM,
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#: depending on :py:attr:`target_vm`
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self.target_dir = None
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#: callback for progress reporting. Will be called with one argument
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#: - progress in percents
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self.progress_callback = None
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#: backup ID, needs to be unique (for a given user),
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#: not necessary unpredictable; automatically generated
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self.backup_id = datetime.datetime.now().strftime(
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'%Y%m%dT%H%M%S-' + str(os.getpid()))
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for key, value in kwargs.items():
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if hasattr(self, key):
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setattr(self, key, value)
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else:
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raise AttributeError(key)
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#: whether backup was canceled
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self.canceled = False
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#: list of PIDs to kill on backup cancel
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self.processes_to_kill_on_cancel = []
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self.log = logging.getLogger('qubes.backup')
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if not self.encrypted:
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self.log.warning('\'encrypted\' option is ignored, backup is '
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'always encrypted')
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if exclude_list is None:
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exclude_list = []
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if vms_list is None:
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vms_list = [vm for vm in app.domains if vm.include_in_backups]
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# Apply exclude list
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self.vms_for_backup = [vm for vm in vms_list
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if vm.name not in exclude_list]
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self._files_to_backup = self.get_files_to_backup()
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def __del__(self):
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if self.tmpdir and os.path.exists(self.tmpdir):
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shutil.rmtree(self.tmpdir)
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def cancel(self):
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"""Cancel running backup operation. Can be called from another thread.
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"""
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self.canceled = True
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for proc in self.processes_to_kill_on_cancel:
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try:
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proc.terminate()
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except OSError:
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pass
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def get_files_to_backup(self):
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files_to_backup = {}
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for vm in self.vms_for_backup:
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if vm.qid == 0:
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# handle dom0 later
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continue
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if self.encrypted:
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subdir = 'vm%d/' % vm.qid
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else:
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subdir = None
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vm_files = []
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if vm.volumes['private'] is not None:
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path_to_private_img = vm.storage.export('private')
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vm_files.append(self.FileToBackup(path_to_private_img, subdir,
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'private.img'))
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vm_files.append(self.FileToBackup(vm.icon_path, subdir))
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vm_files.extend(self.FileToBackup(i, subdir)
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for i in vm.fire_event('backup-get-files'))
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# TODO: drop after merging firewall.xml into qubes.xml
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firewall_conf = os.path.join(vm.dir_path, vm.firewall_conf)
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if os.path.exists(firewall_conf):
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vm_files.append(self.FileToBackup(firewall_conf, subdir))
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if vm.updateable:
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path_to_root_img = vm.storage.export('root')
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vm_files.append(self.FileToBackup(path_to_root_img, subdir,
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'root.img'))
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files_to_backup[vm.qid] = self.VMToBackup(vm, vm_files, subdir)
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# Dom0 user home
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if 0 in [vm.qid for vm in self.vms_for_backup]:
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local_user = grp.getgrnam('qubes').gr_mem[0]
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home_dir = pwd.getpwnam(local_user).pw_dir
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# Home dir should have only user-owned files, so fix it now
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# to prevent permissions problems - some root-owned files can
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# left after 'sudo bash' and similar commands
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subprocess.check_call(['sudo', 'chown', '-R', local_user, home_dir])
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home_to_backup = [
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self.FileToBackup(home_dir, 'dom0-home/')]
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vm_files = home_to_backup
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files_to_backup[0] = self.VMToBackup(self.app.domains[0],
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vm_files,
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os.path.join('dom0-home', os.path.basename(home_dir)))
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self.total_backup_bytes = functools.reduce(
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lambda x, y: x + y.size, files_to_backup.values(), 0)
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return files_to_backup
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def get_backup_summary(self):
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summary = ""
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fields_to_display = [
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{"name": "VM", "width": 16},
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{"name": "type", "width": 12},
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{"name": "size", "width": 12}
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]
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# Display the header
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for f in fields_to_display:
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fmt = "{{0:-^{0}}}-+".format(f["width"] + 1)
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summary += fmt.format('-')
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summary += "\n"
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for f in fields_to_display:
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fmt = "{{0:>{0}}} |".format(f["width"] + 1)
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summary += fmt.format(f["name"])
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summary += "\n"
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for f in fields_to_display:
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fmt = "{{0:-^{0}}}-+".format(f["width"] + 1)
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summary += fmt.format('-')
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summary += "\n"
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files_to_backup = self._files_to_backup
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for qid, vm_info in files_to_backup.items():
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s = ""
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fmt = "{{0:>{0}}} |".format(fields_to_display[0]["width"] + 1)
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s += fmt.format(vm_info['vm'].name)
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fmt = "{{0:>{0}}} |".format(fields_to_display[1]["width"] + 1)
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if qid == 0:
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s += fmt.format("User home")
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elif isinstance(vm_info['vm'], qubes.vm.templatevm.TemplateVM):
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s += fmt.format("Template VM")
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else:
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s += fmt.format("VM" + (" + Sys" if vm_info['vm'].updateable
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else ""))
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vm_size = vm_info['size']
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fmt = "{{0:>{0}}} |".format(fields_to_display[2]["width"] + 1)
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s += fmt.format(size_to_human(vm_size))
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if qid != 0 and vm_info['vm'].is_running():
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s += " <-- The VM is running, please shut it down before proceeding " \
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"with the backup!"
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summary += s + "\n"
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for f in fields_to_display:
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fmt = "{{0:-^{0}}}-+".format(f["width"] + 1)
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summary += fmt.format('-')
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summary += "\n"
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fmt = "{{0:>{0}}} |".format(fields_to_display[0]["width"] + 1)
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summary += fmt.format("Total size:")
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fmt = "{{0:>{0}}} |".format(
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fields_to_display[1]["width"] + 1 + 2 + fields_to_display[2][
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"width"] + 1)
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summary += fmt.format(size_to_human(self.total_backup_bytes))
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summary += "\n"
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for f in fields_to_display:
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fmt = "{{0:-^{0}}}-+".format(f["width"] + 1)
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summary += fmt.format('-')
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summary += "\n"
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vms_not_for_backup = [vm.name for vm in self.app.domains
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if vm not in self.vms_for_backup]
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summary += "VMs not selected for backup:\n - " + "\n - ".join(
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sorted(vms_not_for_backup))
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return summary
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def prepare_backup_header(self):
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header_file_path = os.path.join(self.tmpdir, HEADER_FILENAME)
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backup_header = BackupHeader(
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version=CURRENT_BACKUP_FORMAT_VERSION,
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hmac_algorithm=self.hmac_algorithm,
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crypto_algorithm=self.crypto_algorithm,
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encrypted=self.encrypted,
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compressed=self.compressed,
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compression_filter=self.compression_filter,
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backup_id=self.backup_id,
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)
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backup_header.save(header_file_path)
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|
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hmac = subprocess.Popen(
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["openssl", "dgst", "-" + self.hmac_algorithm,
|
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"-hmac", self.passphrase],
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stdin=open(header_file_path, "r"),
|
|
stdout=open(header_file_path + ".hmac", "w"))
|
|
if hmac.wait() != 0:
|
|
raise qubes.exc.QubesException(
|
|
"Failed to compute hmac of header file")
|
|
return HEADER_FILENAME, HEADER_FILENAME + ".hmac"
|
|
|
|
|
|
@staticmethod
|
|
def _queue_put_with_check(proc, vmproc, queue, element):
|
|
if queue.full():
|
|
if not proc.is_alive():
|
|
if vmproc:
|
|
message = ("Failed to write the backup, VM output:\n" +
|
|
vmproc.stderr.read())
|
|
else:
|
|
message = "Failed to write the backup. Out of disk space?"
|
|
raise qubes.exc.QubesException(message)
|
|
queue.put(element)
|
|
|
|
def _send_progress_update(self):
|
|
if callable(self.progress_callback):
|
|
progress = (
|
|
100 * (self._done_vms_bytes + self._current_vm_bytes) /
|
|
self.total_backup_bytes)
|
|
self.progress_callback(progress)
|
|
|
|
def _add_vm_progress(self, bytes_done):
|
|
self._current_vm_bytes += bytes_done
|
|
self._send_progress_update()
|
|
|
|
def backup_do(self):
|
|
if self.passphrase is None:
|
|
raise qubes.exc.QubesException("No passphrase set")
|
|
qubes_xml = self.app.store
|
|
self.tmpdir = tempfile.mkdtemp()
|
|
shutil.copy(qubes_xml, os.path.join(self.tmpdir, 'qubes.xml'))
|
|
qubes_xml = os.path.join(self.tmpdir, 'qubes.xml')
|
|
backup_app = qubes.Qubes(qubes_xml)
|
|
|
|
files_to_backup = self._files_to_backup
|
|
# make sure backup_content isn't set initially
|
|
for vm in backup_app.domains:
|
|
vm.features['backup-content'] = False
|
|
|
|
for qid, vm_info in files_to_backup.items():
|
|
if qid != 0 and vm_info.vm.is_running():
|
|
raise qubes.exc.QubesVMNotHaltedError(vm_info.vm)
|
|
# VM is included in the backup
|
|
backup_app.domains[qid].features['backup-content'] = True
|
|
backup_app.domains[qid].features['backup-path'] = vm_info.subdir
|
|
backup_app.domains[qid].features['backup-size'] = vm_info.size
|
|
backup_app.save()
|
|
|
|
vmproc = None
|
|
tar_sparse = None
|
|
if self.target_vm is not None:
|
|
# Prepare the backup target (Qubes service call)
|
|
# If APPVM, STDOUT is a PIPE
|
|
vmproc = self.target_vm.run_service('qubes.Backup',
|
|
passio_popen=True, passio_stderr=True)
|
|
vmproc.stdin.write((self.target_dir.
|
|
replace("\r", "").replace("\n", "") + "\n").encode())
|
|
backup_stdout = vmproc.stdin
|
|
self.processes_to_kill_on_cancel.append(vmproc)
|
|
else:
|
|
# Prepare the backup target (local file)
|
|
if os.path.isdir(self.target_dir):
|
|
backup_target = self.target_dir + "/qubes-{0}". \
|
|
format(time.strftime("%Y-%m-%dT%H%M%S"))
|
|
else:
|
|
backup_target = self.target_dir
|
|
|
|
# Create the target directory
|
|
if not os.path.exists(os.path.dirname(self.target_dir)):
|
|
raise qubes.exc.QubesException(
|
|
"ERROR: the backup directory for {0} does not exists".
|
|
format(self.target_dir))
|
|
|
|
# If not APPVM, STDOUT is a local file
|
|
backup_stdout = open(backup_target, 'wb')
|
|
|
|
# Tar with tape length does not deals well with stdout
|
|
# (close stdout between two tapes)
|
|
# For this reason, we will use named pipes instead
|
|
self.log.debug("Working in {}".format(self.tmpdir))
|
|
|
|
backup_pipe = os.path.join(self.tmpdir, "backup_pipe")
|
|
self.log.debug("Creating pipe in: {}".format(backup_pipe))
|
|
os.mkfifo(backup_pipe)
|
|
|
|
self.log.debug("Will backup: {}".format(files_to_backup))
|
|
|
|
header_files = self.prepare_backup_header()
|
|
|
|
# Setup worker to send encrypted data chunks to the backup_target
|
|
to_send = Queue(10)
|
|
send_proc = SendWorker(to_send, self.tmpdir, backup_stdout)
|
|
send_proc.start()
|
|
|
|
for f in header_files:
|
|
to_send.put(f)
|
|
|
|
qubes_xml_info = self.VMToBackup(
|
|
None,
|
|
[self.FileToBackup(qubes_xml, '')],
|
|
''
|
|
)
|
|
for vm_info in itertools.chain([qubes_xml_info],
|
|
files_to_backup.values()):
|
|
for file_info in vm_info.files:
|
|
|
|
self.log.debug("Backing up {}".format(file_info))
|
|
|
|
backup_tempfile = os.path.join(
|
|
self.tmpdir, file_info.subdir,
|
|
file_info.name)
|
|
self.log.debug("Using temporary location: {}".format(
|
|
backup_tempfile))
|
|
|
|
# Ensure the temporary directory exists
|
|
if not os.path.isdir(os.path.dirname(backup_tempfile)):
|
|
os.makedirs(os.path.dirname(backup_tempfile))
|
|
|
|
# The first tar cmd can use any complex feature as we want.
|
|
# Files will be verified before untaring this.
|
|
# Prefix the path in archive with filename["subdir"] to have it
|
|
# verified during untar
|
|
tar_cmdline = (["tar", "-Pc", '--sparse',
|
|
"-f", backup_pipe,
|
|
'-C', os.path.dirname(file_info.path)] +
|
|
(['--dereference'] if
|
|
file_info.subdir != "dom0-home/" else []) +
|
|
['--xform=s:^%s:%s\\0:' % (
|
|
os.path.basename(file_info.path),
|
|
file_info.subdir),
|
|
os.path.basename(file_info.path)
|
|
])
|
|
file_stat = os.stat(file_info.path)
|
|
if stat.S_ISBLK(file_stat.st_mode) or \
|
|
file_info.name != os.path.basename(file_info.path):
|
|
# tar doesn't handle content of block device, use our
|
|
# writer
|
|
# also use our tar writer when renaming file
|
|
assert not stat.S_ISDIR(file_stat.st_mode),\
|
|
"Renaming directories not supported"
|
|
tar_cmdline = ['python', '-m', 'qubes.tarwriter',
|
|
'--override-name=%s' % (
|
|
os.path.join(file_info.subdir, os.path.basename(
|
|
file_info.name))),
|
|
file_info.path,
|
|
backup_pipe]
|
|
if self.compressed:
|
|
tar_cmdline.insert(-2,
|
|
"--use-compress-program=%s" % self.compression_filter)
|
|
|
|
self.log.debug(" ".join(tar_cmdline))
|
|
|
|
# Tips: Popen(bufsize=0)
|
|
# Pipe: tar-sparse | encryptor [| hmac] | tar | backup_target
|
|
# Pipe: tar-sparse [| hmac] | tar | backup_target
|
|
# TODO: log handle stderr
|
|
tar_sparse = subprocess.Popen(
|
|
tar_cmdline, stdin=subprocess.PIPE)
|
|
self.processes_to_kill_on_cancel.append(tar_sparse)
|
|
|
|
# Wait for compressor (tar) process to finish or for any
|
|
# error of other subprocesses
|
|
i = 0
|
|
run_error = "paused"
|
|
encryptor = None
|
|
if self.encrypted:
|
|
# Start encrypt
|
|
# If no cipher is provided,
|
|
# the data is forwarded unencrypted !!!
|
|
encryptor = subprocess.Popen([
|
|
"openssl", "enc",
|
|
"-e", "-" + self.crypto_algorithm,
|
|
"-pass", "pass:" + passphrase],
|
|
stdin=open(backup_pipe, 'rb'),
|
|
stdout=subprocess.PIPE)
|
|
pipe = encryptor.stdout
|
|
else:
|
|
pipe = open(backup_pipe, 'rb')
|
|
while run_error == "paused":
|
|
|
|
# Start HMAC
|
|
hmac = subprocess.Popen([
|
|
"openssl", "dgst", "-" + self.hmac_algorithm,
|
|
"-hmac", passphrase],
|
|
stdin=subprocess.PIPE,
|
|
stdout=subprocess.PIPE)
|
|
|
|
# Prepare a first chunk
|
|
chunkfile = backup_tempfile + "." + "%03d" % i
|
|
i += 1
|
|
chunkfile_p = open(chunkfile, 'wb')
|
|
|
|
run_error = handle_streams(
|
|
pipe,
|
|
{'hmac_data': hmac.stdin,
|
|
'backup_target': chunkfile_p,
|
|
},
|
|
{'hmac': hmac,
|
|
'vmproc': vmproc,
|
|
'addproc': tar_sparse,
|
|
'streamproc': encryptor,
|
|
},
|
|
self.chunk_size,
|
|
self._add_vm_progress
|
|
)
|
|
chunkfile_p.close()
|
|
|
|
self.log.debug(
|
|
"12 returned: {}".format(run_error))
|
|
|
|
if self.canceled:
|
|
try:
|
|
tar_sparse.terminate()
|
|
except OSError:
|
|
pass
|
|
try:
|
|
hmac.terminate()
|
|
except OSError:
|
|
pass
|
|
tar_sparse.wait()
|
|
hmac.wait()
|
|
to_send.put(QUEUE_ERROR)
|
|
send_proc.join()
|
|
shutil.rmtree(self.tmpdir)
|
|
raise BackupCanceledError("Backup canceled")
|
|
if run_error and run_error != "size_limit":
|
|
send_proc.terminate()
|
|
if run_error == "VM" and vmproc:
|
|
raise qubes.exc.QubesException(
|
|
"Failed to write the backup, VM output:\n" +
|
|
vmproc.stderr.read(MAX_STDERR_BYTES))
|
|
else:
|
|
raise qubes.exc.QubesException(
|
|
"Failed to perform backup: error in " +
|
|
run_error)
|
|
|
|
# Send the chunk to the backup target
|
|
self._queue_put_with_check(
|
|
send_proc, vmproc, to_send,
|
|
os.path.relpath(chunkfile, self.tmpdir))
|
|
|
|
# Close HMAC
|
|
hmac.stdin.close()
|
|
hmac.wait()
|
|
self.log.debug("HMAC proc return code: {}".format(
|
|
hmac.poll()))
|
|
|
|
# Write HMAC data next to the chunk file
|
|
hmac_data = hmac.stdout.read()
|
|
self.log.debug(
|
|
"Writing hmac to {}.hmac".format(chunkfile))
|
|
with open(chunkfile + ".hmac", 'w') as hmac_file:
|
|
hmac_file.write(hmac_data)
|
|
|
|
# Send the HMAC to the backup target
|
|
self._queue_put_with_check(
|
|
send_proc, vmproc, to_send,
|
|
os.path.relpath(chunkfile, self.tmpdir) + ".hmac")
|
|
|
|
if tar_sparse.poll() is None or run_error == "size_limit":
|
|
run_error = "paused"
|
|
else:
|
|
self.processes_to_kill_on_cancel.remove(tar_sparse)
|
|
self.log.debug(
|
|
"Finished tar sparse with exit code {}".format(
|
|
tar_sparse.poll()))
|
|
pipe.close()
|
|
|
|
# This VM done, update progress
|
|
self._done_vms_bytes += vm_info.size
|
|
self._current_vm_bytes = 0
|
|
self._send_progress_update()
|
|
# Save date of last backup
|
|
if vm_info.vm:
|
|
vm_info.vm.backup_timestamp = datetime.datetime.now()
|
|
|
|
self._queue_put_with_check(send_proc, vmproc, to_send, QUEUE_FINISHED)
|
|
send_proc.join()
|
|
shutil.rmtree(self.tmpdir)
|
|
|
|
if self.canceled:
|
|
raise BackupCanceledError("Backup canceled")
|
|
|
|
if send_proc.exitcode != 0:
|
|
raise qubes.exc.QubesException(
|
|
"Failed to send backup: error in the sending process")
|
|
|
|
if vmproc:
|
|
self.log.debug("VMProc1 proc return code: {}".format(vmproc.poll()))
|
|
if tar_sparse is not None:
|
|
self.log.debug("Sparse1 proc return code: {}".format(
|
|
tar_sparse.poll()))
|
|
vmproc.stdin.close()
|
|
|
|
self.app.save()
|
|
|
|
|
|
def handle_streams(stream_in, streams_out, processes, size_limit=None,
|
|
progress_callback=None):
|
|
'''
|
|
Copy stream_in to all streams_out and monitor all mentioned processes.
|
|
If any of them terminate with non-zero code, interrupt the process. Copy
|
|
at most `size_limit` data (if given).
|
|
|
|
:param stream_in: file-like object to read data from
|
|
:param streams_out: dict of file-like objects to write data to
|
|
:param processes: dict of subprocess.Popen objects to monitor
|
|
:param size_limit: int maximum data amount to process
|
|
:param progress_callback: callable function to report progress, will be
|
|
given copied data size (it should accumulate internally)
|
|
:return: failed process name, failed stream name, "size_limit" or None (
|
|
no error)
|
|
'''
|
|
buffer_size = 409600
|
|
bytes_copied = 0
|
|
while True:
|
|
if size_limit:
|
|
to_copy = min(buffer_size, size_limit - bytes_copied)
|
|
if to_copy <= 0:
|
|
return "size_limit"
|
|
else:
|
|
to_copy = buffer_size
|
|
buf = stream_in.read(to_copy)
|
|
if not len(buf):
|
|
# done
|
|
return None
|
|
|
|
if callable(progress_callback):
|
|
progress_callback(len(buf))
|
|
for name, stream in streams_out.items():
|
|
if stream is None:
|
|
continue
|
|
try:
|
|
stream.write(buf)
|
|
except IOError:
|
|
return name
|
|
bytes_copied += len(buf)
|
|
|
|
for name, proc in processes.items():
|
|
if proc is None:
|
|
continue
|
|
if proc.poll():
|
|
return name
|
|
|
|
|
|
class ExtractWorker2(Process):
|
|
def __init__(self, queue, base_dir, passphrase, encrypted,
|
|
progress_callback, vmproc=None,
|
|
compressed=False, crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM,
|
|
verify_only=False, relocate=None):
|
|
super(ExtractWorker2, self).__init__()
|
|
#: queue with files to extract
|
|
self.queue = queue
|
|
#: paths on the queue are relative to this dir
|
|
self.base_dir = base_dir
|
|
#: passphrase to decrypt/authenticate data
|
|
self.passphrase = passphrase
|
|
#: extract those files/directories to alternative locations (truncate,
|
|
# but not unlink target beforehand); if specific file is in the map,
|
|
# redirect it accordingly, otherwise check if the whole directory is
|
|
# there
|
|
self.relocate = relocate
|
|
#: is the backup encrypted?
|
|
self.encrypted = encrypted
|
|
#: is the backup compressed?
|
|
self.compressed = compressed
|
|
#: what crypto algorithm is used for encryption?
|
|
self.crypto_algorithm = crypto_algorithm
|
|
#: only verify integrity, don't extract anything
|
|
self.verify_only = verify_only
|
|
#: progress
|
|
self.blocks_backedup = 0
|
|
#: inner tar layer extraction (subprocess.Popen instance)
|
|
self.tar2_process = None
|
|
#: current inner tar archive name
|
|
self.tar2_current_file = None
|
|
#: set size of this file when tar report it on stderr (adjust LVM
|
|
# volume size)
|
|
self.adjust_output_size = None
|
|
#: decompressor subprocess.Popen instance
|
|
self.decompressor_process = None
|
|
#: decryptor subprocess.Popen instance
|
|
self.decryptor_process = None
|
|
#: callback reporting progress to UI
|
|
self.progress_callback = progress_callback
|
|
#: process (subprocess.Popen instance) feeding the data into
|
|
# extraction tool
|
|
self.vmproc = vmproc
|
|
|
|
#: pipe to feed the data into tar (use pipe instead of stdin,
|
|
# as stdin is used for tar control commands)
|
|
self.restore_pipe = os.path.join(self.base_dir, "restore_pipe")
|
|
|
|
self.log = logging.getLogger('qubes.backup.extract')
|
|
self.log.debug("Creating pipe in: {}".format(self.restore_pipe))
|
|
os.mkfifo(self.restore_pipe)
|
|
|
|
self.stderr_encoding = sys.stderr.encoding or 'utf-8'
|
|
|
|
def collect_tar_output(self):
|
|
if not self.tar2_process.stderr:
|
|
return
|
|
|
|
if self.tar2_process.poll() is None:
|
|
try:
|
|
new_lines = self.tar2_process.stderr \
|
|
.read(MAX_STDERR_BYTES).splitlines()
|
|
except IOError as e:
|
|
if e.errno == errno.EAGAIN:
|
|
return
|
|
else:
|
|
raise
|
|
else:
|
|
new_lines = self.tar2_process.stderr.readlines()
|
|
|
|
new_lines = map(lambda x: x.decode(self.stderr_encoding), new_lines)
|
|
|
|
msg_re = re.compile(r".*#[0-9].*restore_pipe")
|
|
debug_msg = filter(msg_re.match, new_lines)
|
|
self.log.debug('tar2_stderr: {}'.format('\n'.join(debug_msg)))
|
|
new_lines = filter(lambda x: not msg_re.match(x), new_lines)
|
|
if self.adjust_output_size:
|
|
# search for first file size reported by tar, after setting
|
|
# self.adjust_output_size (so don't look at self.tar2_stderr)
|
|
# this is used only when extracting single-file archive, so don't
|
|
# bother with checking file name
|
|
file_size_re = re.compile(r"^[^ ]+ [^ ]+/[^ ]+ *([0-9]+) .*")
|
|
for line in new_lines:
|
|
match = file_size_re.match(line)
|
|
if match:
|
|
file_size = match.groups()[0]
|
|
self.resize_lvm(self.adjust_output_size, file_size)
|
|
self.adjust_output_size = None
|
|
self.tar2_stderr += new_lines
|
|
|
|
def resize_lvm(self, dev, size):
|
|
# FIXME: HACK
|
|
try:
|
|
subprocess.check_call(
|
|
['sudo', 'lvresize', '-f', '-L', str(size) + 'B', dev],
|
|
stdout=open(os.devnull, 'w'), stderr=subprocess.STDOUT)
|
|
except subprocess.CalledProcessError as e:
|
|
if e.returncode == 3:
|
|
# already at the right size
|
|
pass
|
|
else:
|
|
raise
|
|
|
|
def run(self):
|
|
try:
|
|
self.__run__()
|
|
except Exception as e:
|
|
exc_type, exc_value, exc_traceback = sys.exc_info()
|
|
# Cleanup children
|
|
for process in [self.decompressor_process,
|
|
self.decryptor_process,
|
|
self.tar2_process]:
|
|
if process:
|
|
try:
|
|
process.terminate()
|
|
except OSError:
|
|
pass
|
|
process.wait()
|
|
self.log.error("ERROR: " + unicode(e))
|
|
raise
|
|
|
|
def handle_dir_relocations(self, dirname):
|
|
''' Relocate files in given director when it's already extracted
|
|
|
|
:param dirname: directory path to handle (relative to backup root),
|
|
without trailing slash
|
|
'''
|
|
|
|
for old, new in self.relocate:
|
|
if not old.startswith(dirname + '/'):
|
|
continue
|
|
# if directory is relocated too (most likely is), the file
|
|
# is extracted there
|
|
if dirname in self.relocate:
|
|
old = old.replace(dirname, self.relocate[dirname], 1)
|
|
try:
|
|
stat_buf = os.stat(new)
|
|
if stat.S_ISBLK(stat_buf.st_mode):
|
|
# output file is block device (LVM) - adjust its
|
|
# size, otherwise it may fail
|
|
# from lack of space
|
|
self.resize_lvm(new, stat_buf.st_size)
|
|
except OSError: # ENOENT
|
|
pass
|
|
subprocess.check_call(
|
|
['dd', 'if='+old, 'of='+new, 'conv=sparse'])
|
|
os.unlink(old)
|
|
|
|
def cleanup_tar2(self, wait=True, terminate=False):
|
|
if self.tar2_process is None:
|
|
return
|
|
if terminate:
|
|
self.tar2_process.terminate()
|
|
if wait:
|
|
self.tar2_process.wait()
|
|
elif self.tar2_process.poll() is None:
|
|
return
|
|
if self.tar2_process.returncode != 0:
|
|
self.collect_tar_output()
|
|
self.log.error(
|
|
"ERROR: unable to extract files for {0}, tar "
|
|
"output:\n {1}".
|
|
format(self.tar2_current_file,
|
|
"\n ".join(self.tar2_stderr)))
|
|
else:
|
|
# Finished extracting the tar file
|
|
self.collect_tar_output()
|
|
self.tar2_process = None
|
|
# if that was whole-directory archive, handle
|
|
# relocated files now
|
|
inner_name = os.path.splitext(self.tar2_current_file)[0]\
|
|
.replace(self.base_dir + '/', '')
|
|
if os.path.basename(inner_name) == '.':
|
|
self.handle_dir_relocations(
|
|
os.path.dirname(inner_name))
|
|
self.tar2_current_file = None
|
|
self.adjust_output_size = None
|
|
|
|
def __run__(self):
|
|
self.log.debug("Started sending thread")
|
|
self.log.debug("Moving to dir " + self.base_dir)
|
|
os.chdir(self.base_dir)
|
|
|
|
filename = None
|
|
|
|
for filename in iter(self.queue.get, None):
|
|
if filename in (QUEUE_FINISHED, QUEUE_ERROR):
|
|
break
|
|
|
|
self.log.debug("Extracting file " + filename)
|
|
|
|
if filename.endswith('.000'):
|
|
# next file
|
|
self.cleanup_tar2(wait=True, terminate=False)
|
|
|
|
inner_name = filename.rstrip('.000').replace(
|
|
self.base_dir + '/', '')
|
|
redirect_stdout = None
|
|
if self.relocate and inner_name in self.relocate:
|
|
# TODO: add `dd conv=sparse` when removing tar layer
|
|
tar2_cmdline = ['tar',
|
|
'-%sMvvOf' % ("t" if self.verify_only else "x"),
|
|
self.restore_pipe,
|
|
inner_name]
|
|
output_file = self.relocate[inner_name]
|
|
try:
|
|
stat_buf = os.stat(output_file)
|
|
if stat.S_ISBLK(stat_buf.st_mode):
|
|
# output file is block device (LVM) - adjust its
|
|
# size during extraction, otherwise it may fail
|
|
# from lack of space
|
|
self.adjust_output_size = output_file
|
|
except OSError: # ENOENT
|
|
pass
|
|
redirect_stdout = open(output_file, 'w')
|
|
elif self.relocate and \
|
|
os.path.dirname(inner_name) in self.relocate:
|
|
tar2_cmdline = ['tar',
|
|
'-%sMf' % ("t" if self.verify_only else "x"),
|
|
self.restore_pipe,
|
|
'-C', self.relocate[os.path.dirname(inner_name)],
|
|
# strip all directories - leave only final filename
|
|
'--strip-components', str(inner_name.count(os.sep)),
|
|
inner_name]
|
|
|
|
else:
|
|
tar2_cmdline = ['tar',
|
|
'-%sMkf' % ("t" if self.verify_only else "x"),
|
|
self.restore_pipe,
|
|
inner_name]
|
|
|
|
self.log.debug("Running command " + str(tar2_cmdline))
|
|
self.tar2_process = subprocess.Popen(tar2_cmdline,
|
|
stdin=subprocess.PIPE, stderr=subprocess.PIPE,
|
|
stdout=redirect_stdout)
|
|
fcntl.fcntl(self.tar2_process.stderr.fileno(), fcntl.F_SETFL,
|
|
fcntl.fcntl(self.tar2_process.stderr.fileno(),
|
|
fcntl.F_GETFL) | os.O_NONBLOCK)
|
|
self.tar2_stderr = []
|
|
elif not self.tar2_process:
|
|
# Extracting of the current archive failed, skip to the next
|
|
# archive
|
|
os.remove(filename)
|
|
continue
|
|
else:
|
|
self.collect_tar_output()
|
|
self.log.debug("Releasing next chunck")
|
|
self.tar2_process.stdin.write("\n")
|
|
self.tar2_process.stdin.flush()
|
|
self.tar2_current_file = filename
|
|
|
|
pipe = open(self.restore_pipe, 'wb')
|
|
monitor_processes = {
|
|
'vmproc': self.vmproc,
|
|
'addproc': self.tar2_process,
|
|
}
|
|
common_args = {
|
|
'backup_target': pipe,
|
|
'hmac': None,
|
|
'vmproc': self.vmproc,
|
|
'addproc': self.tar2_process
|
|
}
|
|
if self.encrypted:
|
|
# Start decrypt
|
|
self.decryptor_process = subprocess.Popen(
|
|
["openssl", "enc",
|
|
"-d",
|
|
"-" + self.crypto_algorithm,
|
|
"-pass",
|
|
"pass:" + self.passphrase] +
|
|
(["-z"] if self.compressed else []),
|
|
stdin=open(filename, 'rb'),
|
|
stdout=subprocess.PIPE)
|
|
in_stream = self.decryptor_process.stdout
|
|
monitor_processes['decryptor'] = self.decryptor_process
|
|
elif self.compressed:
|
|
self.decompressor_process = subprocess.Popen(
|
|
["gzip", "-d"],
|
|
stdin=open(filename, 'rb'),
|
|
stdout=subprocess.PIPE)
|
|
in_stream = self.decompressor_process.stdout
|
|
monitor_processes['decompresor'] = self.decompressor_process
|
|
else:
|
|
in_stream = open(filename, 'rb')
|
|
|
|
run_error = handle_streams(
|
|
in_stream,
|
|
{'target': pipe},
|
|
monitor_processes,
|
|
progress_callback=self.progress_callback)
|
|
|
|
try:
|
|
pipe.close()
|
|
except IOError as e:
|
|
if e.errno == errno.EPIPE:
|
|
self.log.debug(
|
|
"Got EPIPE while closing pipe to "
|
|
"the inner tar process")
|
|
# ignore the error
|
|
else:
|
|
raise
|
|
if run_error:
|
|
if run_error == "target":
|
|
self.collect_tar_output()
|
|
details = "\n".join(self.tar2_stderr)
|
|
else:
|
|
details = "%s failed" % run_error
|
|
self.log.error("Error while processing '{}': {}".format(
|
|
self.tar2_current_file, details))
|
|
self.cleanup_tar2(wait=True, terminate=True)
|
|
|
|
# Delete the file as we don't need it anymore
|
|
self.log.debug("Removing file " + filename)
|
|
os.remove(filename)
|
|
|
|
os.unlink(self.restore_pipe)
|
|
|
|
self.cleanup_tar2(wait=True, terminate=(filename == QUEUE_ERROR))
|
|
self.log.debug("Finished extracting thread")
|
|
|
|
|
|
class ExtractWorker3(ExtractWorker2):
|
|
def __init__(self, queue, base_dir, passphrase, encrypted,
|
|
progress_callback, vmproc=None,
|
|
compressed=False, crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM,
|
|
compression_filter=None, verify_only=False, relocate=None):
|
|
super(ExtractWorker3, self).__init__(queue, base_dir, passphrase,
|
|
encrypted,
|
|
progress_callback, vmproc,
|
|
compressed, crypto_algorithm,
|
|
verify_only, relocate)
|
|
self.compression_filter = compression_filter
|
|
os.unlink(self.restore_pipe)
|
|
|
|
def __run__(self):
|
|
self.log.debug("Started sending thread")
|
|
self.log.debug("Moving to dir " + self.base_dir)
|
|
os.chdir(self.base_dir)
|
|
|
|
filename = None
|
|
|
|
input_pipe = None
|
|
for filename in iter(self.queue.get, None):
|
|
if filename in (QUEUE_FINISHED, QUEUE_ERROR):
|
|
break
|
|
|
|
self.log.debug("Extracting file " + filename)
|
|
|
|
if filename.endswith('.000'):
|
|
# next file
|
|
if self.tar2_process is not None:
|
|
input_pipe.close()
|
|
self.cleanup_tar2(wait=True, terminate=False)
|
|
|
|
inner_name = filename.rstrip('.000').replace(
|
|
self.base_dir + '/', '')
|
|
redirect_stdout = None
|
|
if self.relocate and inner_name in self.relocate:
|
|
# TODO: add dd conv=sparse when removing tar layer
|
|
tar2_cmdline = ['tar',
|
|
'-%svvO' % ("t" if self.verify_only else "x"),
|
|
inner_name]
|
|
output_file = self.relocate[inner_name]
|
|
try:
|
|
stat_buf = os.stat(output_file)
|
|
if stat.S_ISBLK(stat_buf.st_mode):
|
|
# output file is block device (LVM) - adjust its
|
|
# size during extraction, otherwise it may fail
|
|
# from lack of space
|
|
self.adjust_output_size = output_file
|
|
except OSError: # ENOENT
|
|
pass
|
|
redirect_stdout = open(output_file, 'w')
|
|
elif self.relocate and \
|
|
os.path.dirname(inner_name) in self.relocate:
|
|
tar2_cmdline = ['tar',
|
|
'-%s' % ("t" if self.verify_only else "x"),
|
|
'-C', self.relocate[os.path.dirname(inner_name)],
|
|
# strip all directories - leave only final filename
|
|
'--strip-components', str(inner_name.count(os.sep)),
|
|
inner_name]
|
|
else:
|
|
tar2_cmdline = ['tar',
|
|
'-%sk' % ("t" if self.verify_only else "x"),
|
|
inner_name]
|
|
|
|
if self.compressed:
|
|
if self.compression_filter:
|
|
tar2_cmdline.insert(-1,
|
|
"--use-compress-program=%s" %
|
|
self.compression_filter)
|
|
else:
|
|
tar2_cmdline.insert(-1, "--use-compress-program=%s" %
|
|
DEFAULT_COMPRESSION_FILTER)
|
|
|
|
self.log.debug("Running command " + str(tar2_cmdline))
|
|
if self.encrypted:
|
|
# Start decrypt
|
|
self.decryptor_process = subprocess.Popen(
|
|
["openssl", "enc",
|
|
"-d",
|
|
"-" + self.crypto_algorithm,
|
|
"-pass",
|
|
"pass:" + self.passphrase],
|
|
stdin=subprocess.PIPE,
|
|
stdout=subprocess.PIPE)
|
|
|
|
self.tar2_process = subprocess.Popen(
|
|
tar2_cmdline,
|
|
stdin=self.decryptor_process.stdout,
|
|
stdout=redirect_stdout,
|
|
stderr=subprocess.PIPE)
|
|
input_pipe = self.decryptor_process.stdin
|
|
else:
|
|
self.tar2_process = subprocess.Popen(
|
|
tar2_cmdline,
|
|
stdin=subprocess.PIPE,
|
|
stdout=redirect_stdout,
|
|
stderr=subprocess.PIPE)
|
|
input_pipe = self.tar2_process.stdin
|
|
|
|
fcntl.fcntl(self.tar2_process.stderr.fileno(), fcntl.F_SETFL,
|
|
fcntl.fcntl(self.tar2_process.stderr.fileno(),
|
|
fcntl.F_GETFL) | os.O_NONBLOCK)
|
|
self.tar2_stderr = []
|
|
elif not self.tar2_process:
|
|
# Extracting of the current archive failed, skip to the next
|
|
# archive
|
|
os.remove(filename)
|
|
continue
|
|
else:
|
|
(basename, ext) = os.path.splitext(self.tar2_current_file)
|
|
previous_chunk_number = int(ext[1:])
|
|
expected_filename = basename + '.%03d' % (
|
|
previous_chunk_number+1)
|
|
if expected_filename != filename:
|
|
self.cleanup_tar2(wait=True, terminate=True)
|
|
self.log.error(
|
|
'Unexpected file in archive: {}, expected {}'.format(
|
|
filename, expected_filename))
|
|
os.remove(filename)
|
|
continue
|
|
self.log.debug("Releasing next chunck")
|
|
|
|
self.tar2_current_file = filename
|
|
|
|
run_error = handle_streams(
|
|
open(filename, 'rb'),
|
|
{'target': input_pipe},
|
|
{'vmproc': self.vmproc,
|
|
'addproc': self.tar2_process,
|
|
'decryptor': self.decryptor_process,
|
|
},
|
|
progress_callback=self.progress_callback)
|
|
|
|
if run_error:
|
|
if run_error == "target":
|
|
self.collect_tar_output()
|
|
details = "\n".join(self.tar2_stderr)
|
|
else:
|
|
details = "%s failed" % run_error
|
|
if self.decryptor_process:
|
|
self.decryptor_process.terminate()
|
|
self.decryptor_process.wait()
|
|
self.decryptor_process = None
|
|
self.log.error("Error while processing '{}': {}".format(
|
|
self.tar2_current_file, details))
|
|
self.cleanup_tar2(wait=True, terminate=True)
|
|
|
|
# Delete the file as we don't need it anymore
|
|
self.log.debug("Removing file " + filename)
|
|
os.remove(filename)
|
|
|
|
if self.tar2_process is not None:
|
|
input_pipe.close()
|
|
if filename == QUEUE_ERROR:
|
|
if self.decryptor_process:
|
|
self.decryptor_process.terminate()
|
|
self.decryptor_process.wait()
|
|
self.decryptor_process = None
|
|
self.cleanup_tar2(terminate=(filename == QUEUE_ERROR))
|
|
|
|
self.log.debug("Finished extracting thread")
|
|
|
|
|
|
def get_supported_hmac_algo(hmac_algorithm=None):
|
|
# Start with provided default
|
|
if hmac_algorithm:
|
|
yield hmac_algorithm
|
|
proc = subprocess.Popen(['openssl', 'list-message-digest-algorithms'],
|
|
stdout=subprocess.PIPE)
|
|
for algo in proc.stdout.readlines():
|
|
if '=>' in algo:
|
|
continue
|
|
yield algo.strip()
|
|
proc.wait()
|
|
|
|
|
|
class BackupRestoreOptions(object):
|
|
def __init__(self):
|
|
#: use default NetVM if the one referenced in backup do not exists on
|
|
# the host
|
|
self.use_default_netvm = True
|
|
#: set NetVM to "none" if the one referenced in backup do not exists
|
|
# on the host
|
|
self.use_none_netvm = False
|
|
#: set template to default if the one referenced in backup do not
|
|
# exists on the host
|
|
self.use_default_template = True
|
|
#: use default kernel if the one referenced in backup do not exists
|
|
# on the host
|
|
self.use_default_kernel = True
|
|
#: restore dom0 home
|
|
self.dom0_home = True
|
|
#: dictionary how what templates should be used instead of those
|
|
# referenced in backup
|
|
self.replace_template = {}
|
|
#: restore dom0 home even if username is different
|
|
self.ignore_username_mismatch = False
|
|
#: do not restore data, only verify backup integrity
|
|
self.verify_only = False
|
|
#: automatically rename VM during restore, when it would conflict
|
|
# with existing one
|
|
self.rename_conflicting = True
|
|
#: list of VM names to exclude
|
|
self.exclude = []
|
|
#: restore VMs into selected storage pool
|
|
self.override_pool = None
|
|
|
|
|
|
class BackupRestore(object):
|
|
"""Usage:
|
|
>>> restore_op = BackupRestore(...)
|
|
>>> # adjust restore_op.options here
|
|
>>> restore_info = restore_op.get_restore_info()
|
|
>>> # manipulate restore_info to select VMs to restore here
|
|
>>> restore_op.restore_do(restore_info)
|
|
"""
|
|
|
|
class VMToRestore(object):
|
|
#: VM excluded from restore by user
|
|
EXCLUDED = object()
|
|
#: VM with such name already exists on the host
|
|
ALREADY_EXISTS = object()
|
|
#: NetVM used by the VM does not exists on the host
|
|
MISSING_NETVM = object()
|
|
#: TemplateVM used by the VM does not exists on the host
|
|
MISSING_TEMPLATE = object()
|
|
#: Kernel used by the VM does not exists on the host
|
|
MISSING_KERNEL = object()
|
|
|
|
def __init__(self, vm):
|
|
self.vm = vm
|
|
if 'backup-path' in vm.features:
|
|
self.subdir = vm.features['backup-path']
|
|
else:
|
|
self.subdir = None
|
|
if 'backup-size' in vm.features and vm.features['backup-size']:
|
|
self.size = int(vm.features['backup-size'])
|
|
else:
|
|
self.size = 0
|
|
self.problems = set()
|
|
if hasattr(vm, 'template') and vm.template:
|
|
self.template = vm.template.name
|
|
else:
|
|
self.template = None
|
|
if vm.netvm:
|
|
self.netvm = vm.netvm.name
|
|
else:
|
|
self.netvm = None
|
|
self.name = vm.name
|
|
self.orig_template = None
|
|
self.restored_vm = None
|
|
|
|
@property
|
|
def good_to_go(self):
|
|
return len(self.problems) == 0
|
|
|
|
class Dom0ToRestore(VMToRestore):
|
|
#: backup was performed on system with different dom0 username
|
|
USERNAME_MISMATCH = object()
|
|
|
|
def __init__(self, vm, subdir=None):
|
|
super(BackupRestore.Dom0ToRestore, self).__init__(vm)
|
|
if subdir:
|
|
self.subdir = subdir
|
|
self.username = os.path.basename(subdir)
|
|
|
|
def __init__(self, app, backup_location, backup_vm, passphrase):
|
|
super(BackupRestore, self).__init__()
|
|
|
|
#: qubes.Qubes instance
|
|
self.app = app
|
|
|
|
#: options how the backup should be restored
|
|
self.options = BackupRestoreOptions()
|
|
|
|
#: VM from which backup should be retrieved
|
|
self.backup_vm = backup_vm
|
|
if backup_vm and backup_vm.qid == 0:
|
|
self.backup_vm = None
|
|
|
|
#: backup path, inside VM pointed by :py:attr:`backup_vm`
|
|
self.backup_location = backup_location
|
|
|
|
#: passphrase protecting backup integrity and optionally decryption
|
|
self.passphrase = passphrase
|
|
|
|
#: temporary directory used to extract the data before moving to the
|
|
# final location; should be on the same filesystem as /var/lib/qubes
|
|
self.tmpdir = tempfile.mkdtemp(prefix="restore", dir="/var/tmp")
|
|
|
|
#: list of processes (Popen objects) to kill on cancel
|
|
self.processes_to_kill_on_cancel = []
|
|
|
|
#: is the backup operation canceled
|
|
self.canceled = False
|
|
|
|
#: report restore progress, called with one argument - percents of
|
|
# data restored
|
|
# FIXME: convert to float [0,1]
|
|
self.progress_callback = None
|
|
|
|
self.log = logging.getLogger('qubes.backup')
|
|
|
|
#: basic information about the backup
|
|
self.header_data = self._retrieve_backup_header()
|
|
|
|
#: VMs included in the backup
|
|
self.backup_app = self._process_qubes_xml()
|
|
|
|
def cancel(self):
|
|
"""Cancel running backup operation. Can be called from another thread.
|
|
"""
|
|
self.canceled = True
|
|
for proc in self.processes_to_kill_on_cancel:
|
|
try:
|
|
proc.terminate()
|
|
except OSError:
|
|
pass
|
|
|
|
def _start_retrieval_process(self, filelist, limit_count, limit_bytes):
|
|
"""Retrieve backup stream and extract it to :py:attr:`tmpdir`
|
|
|
|
:param filelist: list of files to extract; listing directory name
|
|
will extract the whole directory; use empty list to extract the whole
|
|
archive
|
|
:param limit_count: maximum number of files to extract
|
|
:param limit_bytes: maximum size of extracted data
|
|
:return: a touple of (Popen object of started process, file-like
|
|
object for reading extracted files list, file-like object for reading
|
|
errors)
|
|
"""
|
|
|
|
vmproc = None
|
|
if self.backup_vm is not None:
|
|
# If APPVM, STDOUT is a PIPE
|
|
vmproc = self.backup_vm.run_service('qubes.Restore',
|
|
passio_popen=True, passio_stderr=True)
|
|
vmproc.stdin.write(
|
|
self.backup_location.replace("\r", "").replace("\n", "") + "\n")
|
|
|
|
# Send to tar2qfile the VMs that should be extracted
|
|
vmproc.stdin.write(" ".join(filelist) + "\n")
|
|
self.processes_to_kill_on_cancel.append(vmproc)
|
|
|
|
backup_stdin = vmproc.stdout
|
|
tar1_command = ['/usr/libexec/qubes/qfile-dom0-unpacker',
|
|
str(os.getuid()), self.tmpdir, '-v']
|
|
else:
|
|
backup_stdin = open(self.backup_location, 'rb')
|
|
|
|
tar1_command = ['tar',
|
|
'-ixv',
|
|
'-C', self.tmpdir] + filelist
|
|
|
|
tar1_env = os.environ.copy()
|
|
tar1_env['UPDATES_MAX_BYTES'] = str(limit_bytes)
|
|
tar1_env['UPDATES_MAX_FILES'] = str(limit_count)
|
|
self.log.debug("Run command" + str(tar1_command))
|
|
command = subprocess.Popen(
|
|
tar1_command,
|
|
stdin=backup_stdin,
|
|
stdout=vmproc.stdin if vmproc else subprocess.PIPE,
|
|
stderr=subprocess.PIPE,
|
|
env=tar1_env)
|
|
self.processes_to_kill_on_cancel.append(command)
|
|
|
|
# qfile-dom0-unpacker output filelist on stderr
|
|
# and have stdout connected to the VM), while tar output filelist
|
|
# on stdout
|
|
if self.backup_vm:
|
|
filelist_pipe = command.stderr
|
|
# let qfile-dom0-unpacker hold the only open FD to the write end of
|
|
# pipe, otherwise qrexec-client will not receive EOF when
|
|
# qfile-dom0-unpacker terminates
|
|
vmproc.stdin.close()
|
|
else:
|
|
filelist_pipe = command.stdout
|
|
|
|
if self.backup_vm:
|
|
error_pipe = vmproc.stderr
|
|
else:
|
|
error_pipe = command.stderr
|
|
return command, filelist_pipe, error_pipe
|
|
|
|
def _verify_hmac(self, filename, hmacfile, algorithm=None):
|
|
def load_hmac(hmac_text):
|
|
hmac_text = hmac_text.strip().split("=")
|
|
if len(hmac_text) > 1:
|
|
hmac_text = hmac_text[1].strip()
|
|
else:
|
|
raise qubes.exc.QubesException(
|
|
"ERROR: invalid hmac file content")
|
|
|
|
return hmac_text
|
|
if algorithm is None:
|
|
algorithm = self.header_data.hmac_algorithm
|
|
passphrase = self.passphrase.encode('utf-8')
|
|
self.log.debug("Verifying file {}".format(filename))
|
|
|
|
if hmacfile != filename + ".hmac":
|
|
raise qubes.exc.QubesException(
|
|
"ERROR: expected hmac for {}, but got {}".
|
|
format(filename, hmacfile))
|
|
|
|
hmac_proc = subprocess.Popen(
|
|
["openssl", "dgst", "-" + algorithm, "-hmac", passphrase],
|
|
stdin=open(os.path.join(self.tmpdir, filename), 'rb'),
|
|
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
hmac_stdout, hmac_stderr = hmac_proc.communicate()
|
|
|
|
if len(hmac_stderr) > 0:
|
|
raise qubes.exc.QubesException(
|
|
"ERROR: verify file {0}: {1}".format(filename, hmac_stderr))
|
|
else:
|
|
self.log.debug("Loading hmac for file {}".format(filename))
|
|
hmac = load_hmac(open(os.path.join(self.tmpdir, hmacfile),
|
|
'r').read())
|
|
|
|
if len(hmac) > 0 and load_hmac(hmac_stdout.decode('ascii')) == hmac:
|
|
os.unlink(os.path.join(self.tmpdir, hmacfile))
|
|
self.log.debug(
|
|
"File verification OK -> Sending file {}".format(filename))
|
|
return True
|
|
else:
|
|
raise qubes.exc.QubesException(
|
|
"ERROR: invalid hmac for file {0}: {1}. "
|
|
"Is the passphrase correct?".
|
|
format(filename, load_hmac(hmac_stdout.decode('ascii'))))
|
|
|
|
def _retrieve_backup_header(self):
|
|
"""Retrieve backup header and qubes.xml. Only backup header is
|
|
analyzed, qubes.xml is left as-is
|
|
(not even verified/decrypted/uncompressed)
|
|
|
|
:return header_data
|
|
:rtype :py:class:`BackupHeader`
|
|
"""
|
|
|
|
if not self.backup_vm and os.path.exists(
|
|
os.path.join(self.backup_location, 'qubes.xml')):
|
|
# backup format version 1 doesn't have header
|
|
header_data = BackupHeader()
|
|
header_data.version = 1
|
|
return header_data
|
|
|
|
(retrieve_proc, filelist_pipe, error_pipe) = \
|
|
self._start_retrieval_process(
|
|
['backup-header', 'backup-header.hmac',
|
|
'qubes.xml.000', 'qubes.xml.000.hmac'], 4, 1024 * 1024)
|
|
|
|
expect_tar_error = False
|
|
|
|
filename = filelist_pipe.readline().strip().decode('ascii')
|
|
hmacfile = filelist_pipe.readline().strip().decode('ascii')
|
|
# tar output filename before actually extracting it, so wait for the
|
|
# next one before trying to access it
|
|
if not self.backup_vm:
|
|
filelist_pipe.readline().strip()
|
|
|
|
self.log.debug("Got backup header and hmac: {}, {}".format(
|
|
filename, hmacfile))
|
|
|
|
if not filename or filename == "EOF" or \
|
|
not hmacfile or hmacfile == "EOF":
|
|
retrieve_proc.wait()
|
|
proc_error_msg = error_pipe.read(MAX_STDERR_BYTES)
|
|
raise qubes.exc.QubesException(
|
|
"Premature end of archive while receiving "
|
|
"backup header. Process output:\n" + proc_error_msg)
|
|
file_ok = False
|
|
hmac_algorithm = DEFAULT_HMAC_ALGORITHM
|
|
for hmac_algo in get_supported_hmac_algo(hmac_algorithm):
|
|
try:
|
|
if self._verify_hmac(filename, hmacfile, hmac_algo):
|
|
file_ok = True
|
|
hmac_algorithm = hmac_algo
|
|
break
|
|
except qubes.exc.QubesException:
|
|
# Ignore exception here, try the next algo
|
|
pass
|
|
if not file_ok:
|
|
raise qubes.exc.QubesException(
|
|
"Corrupted backup header (hmac verification "
|
|
"failed). Is the password correct?")
|
|
if os.path.basename(filename) == HEADER_FILENAME:
|
|
filename = os.path.join(self.tmpdir, filename)
|
|
header_data = BackupHeader(open(filename, 'rb').read())
|
|
os.unlink(filename)
|
|
else:
|
|
# if no header found, create one with guessed HMAC algo
|
|
header_data = BackupHeader(
|
|
version=2,
|
|
hmac_algorithm=hmac_algorithm,
|
|
# place explicitly this value, because it is what format_version
|
|
# 2 have
|
|
crypto_algorithm='aes-256-cbc',
|
|
# TODO: set encrypted to something...
|
|
)
|
|
# when tar do not find expected file in archive, it exit with
|
|
# code 2. This will happen because we've requested backup-header
|
|
# file, but the archive do not contain it. Ignore this particular
|
|
# error.
|
|
if not self.backup_vm:
|
|
expect_tar_error = True
|
|
|
|
if retrieve_proc.wait() != 0 and not expect_tar_error:
|
|
raise qubes.exc.QubesException(
|
|
"unable to read the qubes backup file {0} ({1}): {2}".format(
|
|
self.backup_location,
|
|
retrieve_proc.wait(),
|
|
error_pipe.read(MAX_STDERR_BYTES)
|
|
))
|
|
if retrieve_proc in self.processes_to_kill_on_cancel:
|
|
self.processes_to_kill_on_cancel.remove(retrieve_proc)
|
|
# wait for other processes (if any)
|
|
for proc in self.processes_to_kill_on_cancel:
|
|
if proc.wait() != 0:
|
|
raise qubes.exc.QubesException(
|
|
"Backup header retrieval failed (exit code {})".format(
|
|
proc.wait())
|
|
)
|
|
return header_data
|
|
|
|
def _start_inner_extraction_worker(self, queue, relocate):
|
|
"""Start a worker process, extracting inner layer of bacup archive,
|
|
extract them to :py:attr:`tmpdir`.
|
|
End the data by pushing QUEUE_FINISHED or QUEUE_ERROR to the queue.
|
|
|
|
:param queue :py:class:`Queue` object to handle files from
|
|
"""
|
|
|
|
# Setup worker to extract encrypted data chunks to the restore dirs
|
|
# Create the process here to pass it options extracted from
|
|
# backup header
|
|
extractor_params = {
|
|
'queue': queue,
|
|
'base_dir': self.tmpdir,
|
|
'passphrase': self.passphrase,
|
|
'encrypted': self.header_data.encrypted,
|
|
'compressed': self.header_data.compressed,
|
|
'crypto_algorithm': self.header_data.crypto_algorithm,
|
|
'verify_only': self.options.verify_only,
|
|
'progress_callback': self.progress_callback,
|
|
'relocate': relocate,
|
|
}
|
|
self.log.debug('Starting extraction worker in {}, file relocation '
|
|
'map: {!r}'.format(self.tmpdir, relocate))
|
|
format_version = self.header_data.version
|
|
if format_version == 2:
|
|
extract_proc = ExtractWorker2(**extractor_params)
|
|
elif format_version in [3, 4]:
|
|
extractor_params['compression_filter'] = \
|
|
self.header_data.compression_filter
|
|
extract_proc = ExtractWorker3(**extractor_params)
|
|
else:
|
|
raise NotImplementedError(
|
|
"Backup format version %d not supported" % format_version)
|
|
extract_proc.start()
|
|
return extract_proc
|
|
|
|
def _process_qubes_xml(self):
|
|
"""Verify, unpack and load qubes.xml. Possibly convert its format if
|
|
necessary. It expect that :py:attr:`header_data` is already populated,
|
|
and :py:meth:`retrieve_backup_header` was called.
|
|
"""
|
|
if self.header_data.version == 1:
|
|
backup_app = qubes.core2migration.Core2Qubes(
|
|
os.path.join(self.backup_location, 'qubes.xml'),
|
|
offline_mode=True)
|
|
return backup_app
|
|
else:
|
|
self._verify_hmac("qubes.xml.000", "qubes.xml.000.hmac")
|
|
queue = Queue()
|
|
queue.put("qubes.xml.000")
|
|
queue.put(QUEUE_FINISHED)
|
|
|
|
extract_proc = self._start_inner_extraction_worker(queue, None)
|
|
extract_proc.join()
|
|
if extract_proc.exitcode != 0:
|
|
raise qubes.exc.QubesException(
|
|
"unable to extract the qubes backup. "
|
|
"Check extracting process errors.")
|
|
|
|
if self.header_data.version in [2, 3]:
|
|
backup_app = qubes.core2migration.Core2Qubes(
|
|
os.path.join(self.tmpdir, 'qubes.xml'), offline_mode=True)
|
|
else:
|
|
backup_app = qubes.Qubes(os.path.join(self.tmpdir, 'qubes.xml'),
|
|
offline_mode=True)
|
|
# Not needed anymore - all the data stored in backup_app
|
|
os.unlink(os.path.join(self.tmpdir, 'qubes.xml'))
|
|
return backup_app
|
|
|
|
def _restore_vm_dirs(self, vms_dirs, vms_size, relocate):
|
|
# Currently each VM consists of at most 7 archives (count
|
|
# file_to_backup calls in backup_prepare()), but add some safety
|
|
# margin for further extensions. Each archive is divided into 100MB
|
|
# chunks. Additionally each file have own hmac file. So assume upper
|
|
# limit as 2*(10*COUNT_OF_VMS+TOTAL_SIZE/100MB)
|
|
limit_count = str(2 * (10 * len(vms_dirs) +
|
|
int(vms_size / (100 * 1024 * 1024))))
|
|
|
|
self.log.debug("Working in temporary dir:" + self.tmpdir)
|
|
self.log.info(
|
|
"Extracting data: " + size_to_human(vms_size) + " to restore")
|
|
|
|
# retrieve backup from the backup stream (either VM, or dom0 file)
|
|
(retrieve_proc, filelist_pipe, error_pipe) = \
|
|
self._start_retrieval_process(
|
|
vms_dirs, limit_count, vms_size)
|
|
|
|
to_extract = Queue()
|
|
|
|
# extract data retrieved by retrieve_proc
|
|
extract_proc = self._start_inner_extraction_worker(
|
|
to_extract, relocate)
|
|
|
|
try:
|
|
filename = None
|
|
nextfile = None
|
|
while True:
|
|
if self.canceled:
|
|
break
|
|
if not extract_proc.is_alive():
|
|
retrieve_proc.terminate()
|
|
retrieve_proc.wait()
|
|
if retrieve_proc in self.processes_to_kill_on_cancel:
|
|
self.processes_to_kill_on_cancel.remove(retrieve_proc)
|
|
# wait for other processes (if any)
|
|
for proc in self.processes_to_kill_on_cancel:
|
|
proc.wait()
|
|
break
|
|
if nextfile is not None:
|
|
filename = nextfile
|
|
else:
|
|
filename = filelist_pipe.readline().strip()
|
|
|
|
self.log.debug("Getting new file:" + filename)
|
|
|
|
if not filename or filename == "EOF":
|
|
break
|
|
|
|
hmacfile = filelist_pipe.readline().strip()
|
|
|
|
if self.canceled:
|
|
break
|
|
# if reading archive directly with tar, wait for next filename -
|
|
# tar prints filename before processing it, so wait for
|
|
# the next one to be sure that whole file was extracted
|
|
if not self.backup_vm:
|
|
nextfile = filelist_pipe.readline().strip()
|
|
|
|
self.log.debug("Getting hmac:" + hmacfile)
|
|
if not hmacfile or hmacfile == "EOF":
|
|
# Premature end of archive, either of tar1_command or
|
|
# vmproc exited with error
|
|
break
|
|
|
|
if not any(map(lambda x: filename.startswith(x), vms_dirs)):
|
|
self.log.debug("Ignoring VM not selected for restore")
|
|
os.unlink(os.path.join(self.tmpdir, filename))
|
|
os.unlink(os.path.join(self.tmpdir, hmacfile))
|
|
continue
|
|
|
|
if self._verify_hmac(filename, hmacfile):
|
|
to_extract.put(os.path.join(self.tmpdir, filename))
|
|
|
|
if self.canceled:
|
|
raise BackupCanceledError("Restore canceled",
|
|
tmpdir=self.tmpdir)
|
|
|
|
if retrieve_proc.wait() != 0:
|
|
raise qubes.exc.QubesException(
|
|
"unable to read the qubes backup file {0}: {1}"
|
|
.format(self.backup_location, error_pipe.read(
|
|
MAX_STDERR_BYTES)))
|
|
# wait for other processes (if any)
|
|
for proc in self.processes_to_kill_on_cancel:
|
|
proc.wait()
|
|
if proc.returncode != 0:
|
|
raise qubes.exc.QubesException(
|
|
"Backup completed, but VM receiving it reported an error "
|
|
"(exit code {})".format(proc.returncode))
|
|
|
|
if filename and filename != "EOF":
|
|
raise qubes.exc.QubesException(
|
|
"Premature end of archive, the last file was %s" % filename)
|
|
except:
|
|
to_extract.put(QUEUE_ERROR)
|
|
extract_proc.join()
|
|
raise
|
|
else:
|
|
to_extract.put(QUEUE_FINISHED)
|
|
|
|
self.log.debug("Waiting for the extraction process to finish...")
|
|
extract_proc.join()
|
|
self.log.debug("Extraction process finished with code: {}".format(
|
|
extract_proc.exitcode))
|
|
if extract_proc.exitcode != 0:
|
|
raise qubes.exc.QubesException(
|
|
"unable to extract the qubes backup. "
|
|
"Check extracting process errors.")
|
|
|
|
def generate_new_name_for_conflicting_vm(self, orig_name, restore_info):
|
|
number = 1
|
|
if len(orig_name) > 29:
|
|
orig_name = orig_name[0:29]
|
|
new_name = orig_name
|
|
while (new_name in restore_info.keys() or
|
|
new_name in map(lambda x: x.name,
|
|
restore_info.values()) or
|
|
new_name in self.app.domains):
|
|
new_name = str('{}{}'.format(orig_name, number))
|
|
number += 1
|
|
if number == 100:
|
|
# give up
|
|
return None
|
|
return new_name
|
|
|
|
def restore_info_verify(self, restore_info):
|
|
for vm in restore_info.keys():
|
|
if vm in ['dom0']:
|
|
continue
|
|
|
|
vm_info = restore_info[vm]
|
|
assert isinstance(vm_info, self.VMToRestore)
|
|
|
|
vm_info.problems.clear()
|
|
if vm in self.options.exclude:
|
|
vm_info.problems.add(self.VMToRestore.EXCLUDED)
|
|
|
|
if not self.options.verify_only and \
|
|
vm_info.name in self.app.domains:
|
|
if self.options.rename_conflicting:
|
|
new_name = self.generate_new_name_for_conflicting_vm(
|
|
vm, restore_info
|
|
)
|
|
if new_name is not None:
|
|
vm_info.name = new_name
|
|
else:
|
|
vm_info.problems.add(self.VMToRestore.ALREADY_EXISTS)
|
|
else:
|
|
vm_info.problems.add(self.VMToRestore.ALREADY_EXISTS)
|
|
|
|
# check template
|
|
if vm_info.template:
|
|
template_name = vm_info.template
|
|
try:
|
|
host_template = self.app.domains[template_name]
|
|
except KeyError:
|
|
host_template = None
|
|
if not host_template \
|
|
or not isinstance(host_template,
|
|
qubes.vm.templatevm.TemplateVM):
|
|
# Maybe the (custom) template is in the backup?
|
|
if not (template_name in restore_info.keys() and
|
|
restore_info[template_name].good_to_go and
|
|
isinstance(restore_info[template_name].vm,
|
|
qubes.vm.templatevm.TemplateVM)):
|
|
if self.options.use_default_template and \
|
|
self.app.default_template:
|
|
if vm_info.orig_template is None:
|
|
vm_info.orig_template = template_name
|
|
vm_info.template = self.app.default_template.name
|
|
else:
|
|
vm_info.problems.add(
|
|
self.VMToRestore.MISSING_TEMPLATE)
|
|
|
|
# check netvm
|
|
if not vm_info.vm.property_is_default('netvm') and vm_info.netvm:
|
|
netvm_name = vm_info.netvm
|
|
|
|
try:
|
|
netvm_on_host = self.app.domains[netvm_name]
|
|
except KeyError:
|
|
netvm_on_host = None
|
|
# No netvm on the host?
|
|
if not ((netvm_on_host is not None)
|
|
and netvm_on_host.provides_network):
|
|
|
|
# Maybe the (custom) netvm is in the backup?
|
|
if not (netvm_name in restore_info.keys() and
|
|
restore_info[netvm_name].good_to_go and
|
|
restore_info[netvm_name].vm.provides_network):
|
|
if self.options.use_default_netvm:
|
|
vm_info.vm.netvm = qubes.property.DEFAULT
|
|
elif self.options.use_none_netvm:
|
|
vm_info.netvm = None
|
|
else:
|
|
vm_info.problems.add(self.VMToRestore.MISSING_NETVM)
|
|
|
|
# check kernel
|
|
if hasattr(vm_info.vm, 'kernel'):
|
|
installed_kernels = os.listdir(os.path.join(
|
|
qubes.config.qubes_base_dir,
|
|
qubes.config.system_path['qubes_kernels_base_dir']))
|
|
# if uses default kernel - do not validate it
|
|
# allow kernel=None only for HVM,
|
|
# otherwise require valid kernel
|
|
if not (vm_info.vm.property_is_default('kernel')
|
|
or (not vm_info.vm.kernel and vm_info.vm.hvm)
|
|
or vm_info.vm.kernel in installed_kernels):
|
|
if self.options.use_default_kernel:
|
|
vm_info.vm.kernel = qubes.property.DEFAULT
|
|
else:
|
|
vm_info.problems.add(self.VMToRestore.MISSING_KERNEL)
|
|
|
|
return restore_info
|
|
|
|
def _is_vm_included_in_backup_v1(self, check_vm):
|
|
if check_vm.qid == 0:
|
|
return os.path.exists(
|
|
os.path.join(self.backup_location, 'dom0-home'))
|
|
|
|
# DisposableVM
|
|
if check_vm.dir_path is None:
|
|
return False
|
|
|
|
backup_vm_dir_path = check_vm.dir_path.replace(
|
|
qubes.config.system_path["qubes_base_dir"], self.backup_location)
|
|
|
|
if os.path.exists(backup_vm_dir_path):
|
|
return True
|
|
else:
|
|
return False
|
|
|
|
@staticmethod
|
|
def _is_vm_included_in_backup_v2(check_vm):
|
|
if 'backup-content' in check_vm.features:
|
|
return check_vm.features['backup-content']
|
|
else:
|
|
return False
|
|
|
|
def _find_template_name(self, template):
|
|
if template in self.options.replace_template:
|
|
return self.options.replace_template[template]
|
|
return template
|
|
|
|
def _is_vm_included_in_backup(self, vm):
|
|
if self.header_data.version == 1:
|
|
return self._is_vm_included_in_backup_v1(vm)
|
|
elif self.header_data.version in [2, 3, 4]:
|
|
return self._is_vm_included_in_backup_v2(vm)
|
|
else:
|
|
raise qubes.exc.QubesException(
|
|
"Unknown backup format version: {}".format(
|
|
self.header_data.version))
|
|
|
|
def get_restore_info(self):
|
|
# Format versions:
|
|
# 1 - Qubes R1, Qubes R2 beta1, beta2
|
|
# 2 - Qubes R2 beta3+
|
|
|
|
vms_to_restore = {}
|
|
|
|
for vm in self.backup_app.domains:
|
|
if vm.qid == 0:
|
|
# Handle dom0 as special case later
|
|
continue
|
|
if self._is_vm_included_in_backup(vm):
|
|
self.log.debug("{} is included in backup".format(vm.name))
|
|
|
|
vms_to_restore[vm.name] = self.VMToRestore(vm)
|
|
|
|
if hasattr(vm, 'template'):
|
|
templatevm_name = self._find_template_name(
|
|
vm.template.name)
|
|
vms_to_restore[vm.name].template = templatevm_name
|
|
|
|
# Set to None to not confuse QubesVm object from backup
|
|
# collection with host collection (further in clone_attrs).
|
|
vm.netvm = None
|
|
|
|
vms_to_restore = self.restore_info_verify(vms_to_restore)
|
|
|
|
# ...and dom0 home
|
|
if self.options.dom0_home and \
|
|
self._is_vm_included_in_backup(self.backup_app.domains[0]):
|
|
vm = self.backup_app.domains[0]
|
|
if self.header_data.version == 1:
|
|
subdir = os.listdir(os.path.join(self.backup_location,
|
|
'dom0-home'))[0]
|
|
else:
|
|
subdir = None
|
|
vms_to_restore['dom0'] = self.Dom0ToRestore(vm, subdir)
|
|
local_user = grp.getgrnam('qubes').gr_mem[0]
|
|
|
|
if vms_to_restore['dom0'].username != local_user:
|
|
if not self.options.ignore_username_mismatch:
|
|
vms_to_restore['dom0'].problems.add(
|
|
self.Dom0ToRestore.USERNAME_MISMATCH)
|
|
|
|
return vms_to_restore
|
|
|
|
@staticmethod
|
|
def get_restore_summary(restore_info):
|
|
fields = {
|
|
"qid": {"func": "vm.qid"},
|
|
|
|
"name": {"func": "('[' if isinstance(vm, qubes.vm.templatevm.TemplateVM) else '')\
|
|
+ ('{' if vm.provides_network else '')\
|
|
+ vm.name \
|
|
+ (']' if isinstance(vm, qubes.vm.templatevm.TemplateVM) else '')\
|
|
+ ('}' if vm.provides_network else '')"},
|
|
|
|
"type": {"func": "'Tpl' if isinstance(vm, qubes.vm.templatevm.TemplateVM) else \
|
|
'App' if isinstance(vm, qubes.vm.appvm.AppVM) else \
|
|
vm.__class__.__name__.replace('VM','')"},
|
|
|
|
"updbl": {"func": "'Yes' if vm.updateable else ''"},
|
|
|
|
"template": {"func": "'n/a' if not hasattr(vm, 'template') "
|
|
"else vm_info.template"},
|
|
|
|
"netvm": {"func": "('*' if vm.property_is_default('netvm') else '') +\
|
|
vm_info.netvm if vm_info.netvm is not None "
|
|
"else '-'"},
|
|
|
|
"label": {"func": "vm.label.name"},
|
|
}
|
|
|
|
fields_to_display = ["name", "type", "template", "updbl",
|
|
"netvm", "label"]
|
|
|
|
# First calculate the maximum width of each field we want to display
|
|
total_width = 0
|
|
for f in fields_to_display:
|
|
fields[f]["max_width"] = len(f)
|
|
for vm_info in restore_info.values():
|
|
if vm_info.vm:
|
|
# noinspection PyUnusedLocal
|
|
vm = vm_info.vm
|
|
l = len(str(eval(fields[f]["func"])))
|
|
if l > fields[f]["max_width"]:
|
|
fields[f]["max_width"] = l
|
|
total_width += fields[f]["max_width"]
|
|
|
|
summary = ""
|
|
summary += "The following VMs are included in the backup:\n"
|
|
summary += "\n"
|
|
|
|
# Display the header
|
|
for f in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:-^{0}}}-+".format(fields[f]["max_width"] + 1)
|
|
summary += fmt.format('-')
|
|
summary += "\n"
|
|
for f in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:>{0}}} |".format(fields[f]["max_width"] + 1)
|
|
summary += fmt.format(f)
|
|
summary += "\n"
|
|
for f in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:-^{0}}}-+".format(fields[f]["max_width"] + 1)
|
|
summary += fmt.format('-')
|
|
summary += "\n"
|
|
|
|
for vm_info in restore_info.values():
|
|
assert isinstance(vm_info, BackupRestore.VMToRestore)
|
|
# Skip non-VM here
|
|
if not vm_info.vm:
|
|
continue
|
|
# noinspection PyUnusedLocal
|
|
vm = vm_info.vm
|
|
s = ""
|
|
for f in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:>{0}}} |".format(fields[f]["max_width"] + 1)
|
|
s += fmt.format(eval(fields[f]["func"]))
|
|
|
|
if BackupRestore.VMToRestore.EXCLUDED in vm_info.problems:
|
|
s += " <-- Excluded from restore"
|
|
elif BackupRestore.VMToRestore.ALREADY_EXISTS in vm_info.problems:
|
|
s += " <-- A VM with the same name already exists on the host!"
|
|
elif BackupRestore.VMToRestore.MISSING_TEMPLATE in \
|
|
vm_info.problems:
|
|
s += " <-- No matching template on the host " \
|
|
"or in the backup found!"
|
|
elif BackupRestore.VMToRestore.MISSING_NETVM in \
|
|
vm_info.problems:
|
|
s += " <-- No matching netvm on the host " \
|
|
"or in the backup found!"
|
|
else:
|
|
if vm_info.orig_template:
|
|
s += " <-- Original template was '{}'".format(
|
|
vm_info.orig_template)
|
|
if vm_info.name != vm_info.vm.name:
|
|
s += " <-- Will be renamed to '{}'".format(
|
|
vm_info.name)
|
|
|
|
summary += s + "\n"
|
|
|
|
if 'dom0' in restore_info.keys():
|
|
s = ""
|
|
for f in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:>{0}}} |".format(fields[f]["max_width"] + 1)
|
|
if f == "name":
|
|
s += fmt.format("Dom0")
|
|
elif f == "type":
|
|
s += fmt.format("Home")
|
|
else:
|
|
s += fmt.format("")
|
|
if BackupRestore.Dom0ToRestore.USERNAME_MISMATCH in \
|
|
restore_info['dom0'].problems:
|
|
s += " <-- username in backup and dom0 mismatch"
|
|
|
|
summary += s + "\n"
|
|
|
|
return summary
|
|
|
|
def _restore_vm_dir_v1(self, src_dir, dst_dir):
|
|
|
|
backup_src_dir = src_dir.replace(
|
|
qubes.config.system_path["qubes_base_dir"], self.backup_location)
|
|
|
|
# We prefer to use Linux's cp, because it nicely handles sparse files
|
|
cp_retcode = subprocess.call(
|
|
["cp", "-rp", "--reflink=auto", backup_src_dir, dst_dir])
|
|
if cp_retcode != 0:
|
|
raise qubes.exc.QubesException(
|
|
"*** Error while copying file {0} to {1}".format(backup_src_dir,
|
|
dst_dir))
|
|
|
|
@staticmethod
|
|
def _templates_first(vms):
|
|
def key_function(instance):
|
|
if isinstance(instance, qubes.vm.BaseVM):
|
|
return isinstance(instance, qubes.vm.templatevm.TemplateVM)
|
|
elif hasattr(instance, 'vm'):
|
|
return key_function(instance.vm)
|
|
else:
|
|
return 0
|
|
return sorted(vms,
|
|
key=key_function,
|
|
reverse=True)
|
|
|
|
def restore_do(self, restore_info):
|
|
'''
|
|
|
|
|
|
High level workflow:
|
|
1. Create VMs object in host collection (qubes.xml)
|
|
2. Create them on disk (vm.create_on_disk)
|
|
3. Restore VM data, overriding/converting VM files
|
|
4. Apply possible fixups and save qubes.xml
|
|
|
|
:param restore_info:
|
|
:return:
|
|
'''
|
|
|
|
# FIXME handle locking
|
|
|
|
restore_info = self.restore_info_verify(restore_info)
|
|
|
|
self._restore_vms_metadata(restore_info)
|
|
|
|
# Perform VM restoration in backup order
|
|
vms_dirs = []
|
|
relocate = {}
|
|
vms_size = 0
|
|
for vm_info in self._templates_first(restore_info.values()):
|
|
vm = vm_info.restored_vm
|
|
if vm:
|
|
vms_size += int(vm_info.size)
|
|
vms_dirs.append(vm_info.subdir)
|
|
relocate[vm_info.subdir.rstrip('/')] = vm.dir_path
|
|
for name, volume in vm.volumes.items():
|
|
if not volume.save_on_stop:
|
|
continue
|
|
export_path = vm.storage.export(name)
|
|
backup_path = os.path.join(
|
|
vm_info.vm.dir_path, name + '.img')
|
|
if backup_path != export_path:
|
|
relocate[
|
|
os.path.join(vm_info.subdir, name + '.img')] = \
|
|
export_path
|
|
|
|
if self.header_data.version >= 2:
|
|
if 'dom0' in restore_info.keys() and \
|
|
restore_info['dom0'].good_to_go:
|
|
vms_dirs.append(os.path.dirname(restore_info['dom0'].subdir))
|
|
vms_size += restore_info['dom0'].size
|
|
|
|
try:
|
|
self._restore_vm_dirs(vms_dirs=vms_dirs, vms_size=vms_size,
|
|
relocate=relocate)
|
|
except qubes.exc.QubesException:
|
|
if self.options.verify_only:
|
|
raise
|
|
else:
|
|
self.log.warning(
|
|
"Some errors occurred during data extraction, "
|
|
"continuing anyway to restore at least some "
|
|
"VMs")
|
|
else:
|
|
for vm_info in self._templates_first(restore_info.values()):
|
|
vm = vm_info.restored_vm
|
|
if vm:
|
|
try:
|
|
self._restore_vm_dir_v1(vm_info.vm.dir_path,
|
|
os.path.dirname(vm.dir_path))
|
|
except qubes.exc.QubesException as e:
|
|
if self.options.verify_only:
|
|
raise
|
|
else:
|
|
self.log.error(
|
|
"Failed to restore VM '{}': {}".format(
|
|
vm.name, str(e)))
|
|
vm.remove_from_disk()
|
|
del self.app.domains[vm]
|
|
|
|
if self.options.verify_only:
|
|
self.log.warning(
|
|
"Backup verification not supported for this backup format.")
|
|
|
|
if self.options.verify_only:
|
|
shutil.rmtree(self.tmpdir)
|
|
return
|
|
|
|
for vm_info in self._templates_first(restore_info.values()):
|
|
if not vm_info.restored_vm:
|
|
continue
|
|
try:
|
|
vm_info.restored_vm.fire_event('domain-restore')
|
|
except Exception as err:
|
|
self.log.error("ERROR during appmenu restore: "
|
|
"{0}".format(err))
|
|
self.log.warning(
|
|
"*** VM '{0}' will not have appmenus".format(vm_info.name))
|
|
|
|
try:
|
|
vm_info.restored_vm.storage.verify()
|
|
except Exception as err:
|
|
self.log.error("ERROR: {0}".format(err))
|
|
if vm_info.restored_vm:
|
|
vm_info.restored_vm.remove_from_disk()
|
|
del self.app.domains[vm_info.restored_vm]
|
|
|
|
self.app.save()
|
|
|
|
if self.canceled:
|
|
if self.header_data.version >= 2:
|
|
raise BackupCanceledError("Restore canceled",
|
|
tmpdir=self.tmpdir)
|
|
else:
|
|
raise BackupCanceledError("Restore canceled")
|
|
|
|
# ... and dom0 home as last step
|
|
if 'dom0' in restore_info.keys() and restore_info['dom0'].good_to_go:
|
|
backup_path = restore_info['dom0'].subdir
|
|
local_user = grp.getgrnam('qubes').gr_mem[0]
|
|
home_dir = pwd.getpwnam(local_user).pw_dir
|
|
if self.header_data.version == 1:
|
|
backup_dom0_home_dir = os.path.join(self.backup_location,
|
|
backup_path)
|
|
else:
|
|
backup_dom0_home_dir = os.path.join(self.tmpdir, backup_path)
|
|
restore_home_backupdir = "home-pre-restore-{0}".format(
|
|
time.strftime("%Y-%m-%d-%H%M%S"))
|
|
|
|
self.log.info(
|
|
"Restoring home of user '{0}'...".format(local_user))
|
|
self.log.info(
|
|
"Existing files/dirs backed up in '{0}' dir".format(
|
|
restore_home_backupdir))
|
|
os.mkdir(home_dir + '/' + restore_home_backupdir)
|
|
for f in os.listdir(backup_dom0_home_dir):
|
|
home_file = home_dir + '/' + f
|
|
if os.path.exists(home_file):
|
|
os.rename(home_file,
|
|
home_dir + '/' + restore_home_backupdir + '/' + f)
|
|
if self.header_data.version == 1:
|
|
subprocess.call(
|
|
["cp", "-nrp", "--reflink=auto",
|
|
backup_dom0_home_dir + '/' + f, home_file])
|
|
elif self.header_data.version >= 2:
|
|
shutil.move(backup_dom0_home_dir + '/' + f, home_file)
|
|
retcode = subprocess.call(['sudo', 'chown', '-R',
|
|
local_user, home_dir])
|
|
if retcode != 0:
|
|
self.log.error("*** Error while setting home directory owner")
|
|
|
|
shutil.rmtree(self.tmpdir)
|
|
self.log.info("-> Done. Please install updates for all the restored "
|
|
"templates.")
|
|
|
|
def _restore_vms_metadata(self, restore_info):
|
|
vms = {}
|
|
for vm_info in restore_info.values():
|
|
assert isinstance(vm_info, self.VMToRestore)
|
|
if not vm_info.vm:
|
|
continue
|
|
if not vm_info.good_to_go:
|
|
continue
|
|
vm = vm_info.vm
|
|
vms[vm.name] = vm
|
|
|
|
# First load templates, then other VMs
|
|
for vm in self._templates_first(vms.values()):
|
|
if self.canceled:
|
|
# only break the loop to save qubes.xml
|
|
# with already restored VMs
|
|
break
|
|
self.log.info("-> Restoring {0}...".format(vm.name))
|
|
kwargs = {}
|
|
if hasattr(vm, 'template'):
|
|
template = restore_info[vm.name].template
|
|
# handle potentially renamed template
|
|
if template in restore_info \
|
|
and restore_info[template].good_to_go:
|
|
template = restore_info[template].name
|
|
kwargs['template'] = template
|
|
|
|
new_vm = None
|
|
vm_name = restore_info[vm.name].name
|
|
|
|
try:
|
|
# first only minimal set, later clone_properties
|
|
# will be called
|
|
cls = self.app.get_vm_class(vm.__class__.__name__)
|
|
new_vm = self.app.add_new_vm(
|
|
cls,
|
|
name=vm_name,
|
|
label=vm.label,
|
|
installed_by_rpm=False,
|
|
**kwargs)
|
|
if os.path.exists(new_vm.dir_path):
|
|
move_to_path = tempfile.mkdtemp('', os.path.basename(
|
|
new_vm.dir_path), os.path.dirname(new_vm.dir_path))
|
|
try:
|
|
os.rename(new_vm.dir_path, move_to_path)
|
|
self.log.warning(
|
|
"*** Directory {} already exists! It has "
|
|
"been moved to {}".format(new_vm.dir_path,
|
|
move_to_path))
|
|
except OSError:
|
|
self.log.error(
|
|
"*** Directory {} already exists and "
|
|
"cannot be moved!".format(new_vm.dir_path))
|
|
self.log.warning("Skipping VM {}...".format(
|
|
vm.name))
|
|
continue
|
|
except Exception as err:
|
|
self.log.error("ERROR: {0}".format(err))
|
|
self.log.warning("*** Skipping VM: {0}".format(vm.name))
|
|
if new_vm:
|
|
del self.app.domains[new_vm.qid]
|
|
continue
|
|
|
|
# remove no longer needed backup metadata
|
|
if 'backup-content' in vm.features:
|
|
del vm.features['backup-content']
|
|
del vm.features['backup-size']
|
|
del vm.features['backup-path']
|
|
try:
|
|
# exclude VM references - handled manually according to
|
|
# restore options
|
|
proplist = [prop for prop in new_vm.property_list()
|
|
if prop.clone and prop.__name__ not in
|
|
['template', 'netvm', 'dispvm_netvm']]
|
|
new_vm.clone_properties(vm, proplist=proplist)
|
|
except Exception as err:
|
|
self.log.error("ERROR: {0}".format(err))
|
|
self.log.warning("*** Some VM property will not be "
|
|
"restored")
|
|
|
|
if not self.options.verify_only:
|
|
try:
|
|
# have it here, to (maybe) patch storage config before
|
|
# creating child VMs (template first)
|
|
# TODO: adjust volumes config - especially size
|
|
new_vm.create_on_disk(pool=self.options.override_pool)
|
|
except qubes.exc.QubesException as e:
|
|
self.log.warning("Failed to create VM {}: {}".format(
|
|
vm.name, str(e)))
|
|
del self.app.domains[new_vm]
|
|
continue
|
|
|
|
restore_info[vm.name].restored_vm = new_vm
|
|
|
|
# Set network dependencies - only non-default netvm setting
|
|
for vm in vms.values():
|
|
vm_info = restore_info[vm.name]
|
|
vm_name = vm_info.name
|
|
try:
|
|
host_vm = self.app.domains[vm_name]
|
|
except KeyError:
|
|
# Failed/skipped VM
|
|
continue
|
|
|
|
if not vm.property_is_default('netvm'):
|
|
if vm_info.netvm in restore_info:
|
|
host_vm.netvm = restore_info[vm_info.netvm].name
|
|
else:
|
|
host_vm.netvm = vm_info.netvm
|
|
|
|
# vim:sw=4:et:
|