6568d624cc
Abort tar process after extracting requested files - do not parse the archive until the end (possibly tens of GB later). Fixes QubesOS/qubes-issues#2986
1923 lines
76 KiB
Python
1923 lines
76 KiB
Python
# -*- encoding: utf8 -*-
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#
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# The Qubes OS Project, http://www.qubes-os.org
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#
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# Copyright (C) 2017 Marek Marczykowski-Górecki
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# <marmarek@invisiblethingslab.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU Lesser General Public License as published by
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# the Free Software Foundation; either version 2.1 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public License along
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# with this program; if not, see <http://www.gnu.org/licenses/>.
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'''Backup restore module'''
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import errno
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import fcntl
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import functools
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import grp
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import logging
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import multiprocessing
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from multiprocessing import Queue, Process
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import os
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import pwd
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import re
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import shutil
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import subprocess
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import sys
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import tempfile
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import termios
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import time
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import qubesadmin
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import qubesadmin.vm
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from qubesadmin.backup import BackupVM
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from qubesadmin.backup.core2 import Core2Qubes
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from qubesadmin.backup.core3 import Core3Qubes
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from qubesadmin.devices import DeviceAssignment
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from qubesadmin.exc import QubesException
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from qubesadmin.utils import size_to_human
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# must be picklable
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QUEUE_FINISHED = "!!!FINISHED"
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QUEUE_ERROR = "!!!ERROR"
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HEADER_FILENAME = 'backup-header'
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DEFAULT_CRYPTO_ALGORITHM = 'aes-256-cbc'
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# 'scrypt' is not exactly HMAC algorithm, but a tool we use to
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# integrity-protect the data
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DEFAULT_HMAC_ALGORITHM = 'scrypt'
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DEFAULT_COMPRESSION_FILTER = 'gzip'
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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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# hmac file max size - regardless of backup format version!
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HMAC_MAX_SIZE = 4096
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BLKSIZE = 512
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_re_alphanum = re.compile(r'^[A-Za-z0-9-]*$')
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_tar_msg_re = re.compile(r".*#[0-9].*restore_pipe")
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_tar_file_size_re = re.compile(r"^[^ ]+ [^ ]+/[^ ]+ *([0-9]+) .*")
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class BackupCanceledError(QubesException):
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'''Exception raised when backup/restore was cancelled'''
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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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'''Structure describing backup-header file included as the first file in
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backup archive
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'''
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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 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 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 QubesException("Invalid backup header ("
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"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 QubesException("Invalid backup header ("
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"value)")
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if getattr(self, self.header_keys[key]) is not None:
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raise 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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'''Validate header data, according to header version'''
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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 and self.version < 4:
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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 QubesException(
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"Backup header lack '{}' info".format(key))
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else:
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raise QubesException(
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"Unsupported backup version {}".format(self.version))
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def save(self, filename):
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'''Save backup header into a file'''
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with open(filename, "w") as f_header:
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# make sure 'version' is the first key
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f_header.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_header.write("{!s}={!s}\n".format(key, getattr(self, attr)))
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def launch_proc_with_pty(args, stdin=None, stdout=None, stderr=None, echo=True):
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"""Similar to pty.fork, but handle stdin/stdout according to parameters
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instead of connecting to the pty
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:return tuple (subprocess.Popen, pty_master)
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"""
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def set_ctty(ctty_fd, master_fd):
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'''Set controlling terminal'''
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os.setsid()
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os.close(master_fd)
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fcntl.ioctl(ctty_fd, termios.TIOCSCTTY, 0)
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if not echo:
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termios_p = termios.tcgetattr(ctty_fd)
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# termios_p.c_lflags
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termios_p[3] &= ~termios.ECHO
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termios.tcsetattr(ctty_fd, termios.TCSANOW, termios_p)
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(pty_master, pty_slave) = os.openpty()
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p = subprocess.Popen(args, stdin=stdin, stdout=stdout,
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stderr=stderr,
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preexec_fn=lambda: set_ctty(pty_slave, pty_master))
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os.close(pty_slave)
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return p, open(pty_master, 'wb+', buffering=0)
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def launch_scrypt(action, input_name, output_name, passphrase):
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'''
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Launch 'scrypt' process, pass passphrase to it and return
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subprocess.Popen object.
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:param action: 'enc' or 'dec'
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:param input_name: input path or '-' for stdin
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:param output_name: output path or '-' for stdout
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:param passphrase: passphrase
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:return: subprocess.Popen object
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'''
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command_line = ['scrypt', action, input_name, output_name]
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(p, pty) = launch_proc_with_pty(command_line,
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stdin=subprocess.PIPE if input_name == '-' else None,
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stdout=subprocess.PIPE if output_name == '-' else None,
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stderr=subprocess.PIPE,
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echo=False)
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if action == 'enc':
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prompts = (b'Please enter passphrase: ', b'Please confirm passphrase: ')
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else:
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prompts = (b'Please enter passphrase: ',)
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for prompt in prompts:
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actual_prompt = p.stderr.read(len(prompt))
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if actual_prompt != prompt:
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raise QubesException(
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'Unexpected prompt from scrypt: {}'.format(actual_prompt))
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pty.write(passphrase.encode('utf-8') + b'\n')
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pty.flush()
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# save it here, so garbage collector would not close it (which would kill
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# the child)
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p.pty = pty
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return p
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class ExtractWorker3(Process):
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'''Process for handling inner tar layer of backup archive'''
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# pylint: disable=too-many-instance-attributes
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def __init__(self, queue, base_dir, passphrase, encrypted,
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progress_callback, vmproc=None,
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compressed=False, crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM,
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compression_filter=None, verify_only=False, handlers=None):
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'''Start inner tar extraction worker
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The purpose of this class is to process files extracted from outer
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archive layer and pass to appropriate handlers. Input files are given
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through a queue. Insert :py:obj:`QUEUE_FINISHED` or
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:py:obj:`QUEUE_ERROR` to end data processing (either cleanly,
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or forcefully).
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Handlers are given as a map filename -> (data_func, size_func),
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where data_func is called with file-like object to process,
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and size_func is called with file size as argument. Note that
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data_func and size_func may be called simultaneusly, in a different
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processes.
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:param multiprocessing.Queue queue: a queue with filenames to
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process; those files needs to be given as full path, inside *base_dir*
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:param str base_dir: directory where all files to process live
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:param str passphrase: passphrase to decrypt the data
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:param bool encrypted: is encryption applied?
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:param callable progress_callback: report extraction progress
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:param subprocess.Popen vmproc: process extracting outer layer,
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given here to monitor
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it for failures (when it exits with non-zero exit code, inner layer
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processing is stopped)
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:param bool compressed: is the data compressed?
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:param str crypto_algorithm: encryption algorithm, either `scrypt` or an
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algorithm supported by openssl
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:param str compression_filter: compression program, `gzip` by default
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:param bool verify_only: only verify data integrity, do not extract
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:param dict handlers: handlers for actual data
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'''
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super(ExtractWorker3, self).__init__()
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#: queue with files to extract
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self.queue = queue
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#: paths on the queue are relative to this dir
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self.base_dir = base_dir
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#: passphrase to decrypt/authenticate data
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self.passphrase = passphrase
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#: handlers for files; it should be dict filename -> (data_function,
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# size_function),
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# where data_function will get file-like object as the only argument and
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# might be called in a separate process (multiprocessing.Process),
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# and size_function will get file size (when known) in bytes
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self.handlers = handlers
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#: is the backup encrypted?
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self.encrypted = encrypted
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#: is the backup compressed?
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self.compressed = compressed
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#: what crypto algorithm is used for encryption?
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self.crypto_algorithm = crypto_algorithm
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#: only verify integrity, don't extract anything
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self.verify_only = verify_only
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#: progress
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self.blocks_backedup = 0
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#: inner tar layer extraction (subprocess.Popen instance)
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self.tar2_process = None
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#: current inner tar archive name
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self.tar2_current_file = None
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#: cat process feeding tar2_process
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self.tar2_feeder = None
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#: decompressor subprocess.Popen instance
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self.decompressor_process = None
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#: decryptor subprocess.Popen instance
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self.decryptor_process = None
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#: data import multiprocessing.Process instance
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self.import_process = None
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#: callback reporting progress to UI
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self.progress_callback = progress_callback
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#: process (subprocess.Popen instance) feeding the data into
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# extraction tool
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self.vmproc = vmproc
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self.log = logging.getLogger('qubesadmin.backup.extract')
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self.stderr_encoding = sys.stderr.encoding or 'utf-8'
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self.tar2_stderr = []
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self.compression_filter = compression_filter
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def collect_tar_output(self):
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'''Retrieve tar stderr and handle it appropriately
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Log errors, process file size if requested.
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This use :py:attr:`tar2_process`.
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'''
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if not self.tar2_process.stderr:
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return
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if self.tar2_process.poll() is None:
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try:
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new_lines = self.tar2_process.stderr \
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.read(MAX_STDERR_BYTES).splitlines()
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except IOError as e:
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if e.errno == errno.EAGAIN:
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return
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else:
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raise
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else:
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new_lines = self.tar2_process.stderr.readlines()
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new_lines = [x.decode(self.stderr_encoding) for x in new_lines]
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debug_msg = [msg for msg in new_lines if _tar_msg_re.match(msg)]
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self.log.debug('tar2_stderr: %s', '\n'.join(debug_msg))
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new_lines = [msg for msg in new_lines if not _tar_msg_re.match(msg)]
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self.tar2_stderr += new_lines
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def run(self):
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try:
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self.__run__()
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except Exception:
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# Cleanup children
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for process in [self.decompressor_process,
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self.decryptor_process,
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self.tar2_process]:
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if process:
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try:
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process.terminate()
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except OSError:
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pass
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process.wait()
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self.log.exception('ERROR')
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raise
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def handle_dir(self, dirname):
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''' Relocate files in given director when it's already extracted
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:param dirname: directory path to handle (relative to backup root),
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without trailing slash
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'''
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for fname, (data_func, size_func) in self.handlers.items():
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if not fname.startswith(dirname + '/'):
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continue
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if not os.path.exists(fname):
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# for example firewall.xml
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continue
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if size_func is not None:
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size_func(os.path.getsize(fname))
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with open(fname, 'rb') as input_file:
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data_func(input_file)
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os.unlink(fname)
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shutil.rmtree(dirname)
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def cleanup_tar2(self, wait=True, terminate=False):
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'''Cleanup running :py:attr:`tar2_process`
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:param wait: wait for it termination, otherwise method exit early if
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process is still running
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:param terminate: terminate the process if still running
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'''
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if self.tar2_process is None:
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return
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if terminate:
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if self.import_process is not None:
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self.tar2_process.terminate()
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self.import_process.terminate()
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if wait:
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self.tar2_process.wait()
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if self.import_process is not None:
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self.import_process.join()
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elif self.tar2_process.poll() is None:
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return
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self.collect_tar_output()
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if self.tar2_process.stderr:
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self.tar2_process.stderr.close()
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if self.tar2_process.returncode != 0:
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self.log.error(
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"ERROR: unable to extract files for %s, tar "
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"output:\n %s",
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self.tar2_current_file,
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"\n ".join(self.tar2_stderr))
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else:
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# Finished extracting the tar file
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# if that was whole-directory archive, handle
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# relocated files now
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inner_name = self.tar2_current_file.rsplit('.', 1)[0] \
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.replace(self.base_dir + '/', '')
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if os.path.basename(inner_name) == '.':
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self.handle_dir(
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os.path.dirname(inner_name))
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self.tar2_current_file = None
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self.tar2_process = None
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def _data_import_wrapper(self, close_fds, data_func, size_func,
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tar2_process):
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'''Close not needed file descriptors, handle output size reported
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by tar (if needed) then call data_func(tar2_process.stdout).
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This is to prevent holding write end of a pipe in subprocess,
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preventing EOF transfer.
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'''
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for fd in close_fds:
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if fd in (tar2_process.stdout.fileno(),
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tar2_process.stderr.fileno()):
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continue
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try:
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os.close(fd)
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except OSError:
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pass
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# retrieve file size from tar's stderr; warning: we do
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# not read data from tar's stdout at this point, it will
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# hang if it tries to output file content before
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# reporting its size on stderr first
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if size_func:
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# process lines on stderr until we get file size
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# search for first file size reported by tar -
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# this is used only when extracting single-file archive, so don't
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# bother with checking file name
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# Also, this needs to be called before anything is retrieved
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# from tar stderr, otherwise the process may deadlock waiting for
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# size (at this point nothing is retrieving data from tar stdout
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# yet, so it will hang on write() when the output pipe fill up).
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while True:
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line = tar2_process.stderr.readline()
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line = line.decode()
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if _tar_msg_re.match(line):
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self.log.debug('tar2_stderr: %s', line)
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else:
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match = _tar_file_size_re.match(line)
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if match:
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file_size = match.groups()[0]
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size_func(file_size)
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break
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else:
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self.log.warning(
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'unexpected tar output (no file size report): %s',
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line)
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return data_func(tar2_process.stdout)
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def feed_tar2(self, filename, input_pipe):
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'''Feed data from *filename* to *input_pipe*
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Start a cat process to do that (do not block this process). Cat
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subprocess instance will be in :py:attr:`tar2_feeder`
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'''
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assert self.tar2_feeder is None
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|
|
|
self.tar2_feeder = subprocess.Popen(['cat', filename],
|
|
stdout=input_pipe)
|
|
|
|
def check_processes(self, processes):
|
|
'''Check if any process failed.
|
|
|
|
And if so, wait for other relevant processes to cleanup.
|
|
'''
|
|
run_error = None
|
|
for name, proc in processes.items():
|
|
if proc is None:
|
|
continue
|
|
|
|
if isinstance(proc, Process):
|
|
if not proc.is_alive() and proc.exitcode != 0:
|
|
run_error = name
|
|
break
|
|
elif proc.poll():
|
|
run_error = name
|
|
break
|
|
|
|
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 \'%s\': %s',
|
|
self.tar2_current_file, details)
|
|
self.cleanup_tar2(wait=True, terminate=True)
|
|
|
|
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
|
|
|
|
assert isinstance(filename, str)
|
|
|
|
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[:-len('.000')].replace(
|
|
self.base_dir + '/', '')
|
|
redirect_stdout = None
|
|
if os.path.basename(inner_name) == '.':
|
|
if (inner_name in self.handlers or
|
|
any(x.startswith(os.path.dirname(inner_name) + '/')
|
|
for x in self.handlers)):
|
|
tar2_cmdline = ['tar',
|
|
'-%s' % ("t" if self.verify_only else "x"),
|
|
inner_name]
|
|
else:
|
|
# ignore this directory
|
|
tar2_cmdline = None
|
|
elif inner_name in self.handlers:
|
|
tar2_cmdline = ['tar',
|
|
'-%svvO' % ("t" if self.verify_only else "x"),
|
|
inner_name]
|
|
redirect_stdout = subprocess.PIPE
|
|
else:
|
|
# no handlers for this file, ignore it
|
|
tar2_cmdline = None
|
|
|
|
if tar2_cmdline is None:
|
|
# ignore the file
|
|
os.remove(filename)
|
|
continue
|
|
|
|
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)
|
|
self.decryptor_process.stdout.close()
|
|
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
|
|
|
|
self.feed_tar2(filename, input_pipe)
|
|
|
|
if inner_name in self.handlers:
|
|
assert redirect_stdout is subprocess.PIPE
|
|
data_func, size_func = self.handlers[inner_name]
|
|
self.import_process = multiprocessing.Process(
|
|
target=self._data_import_wrapper,
|
|
args=([input_pipe.fileno()],
|
|
data_func, size_func, self.tar2_process))
|
|
|
|
self.import_process.start()
|
|
self.tar2_process.stdout.close()
|
|
|
|
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: %s, expected %s',
|
|
filename, expected_filename)
|
|
os.remove(filename)
|
|
continue
|
|
|
|
self.log.debug("Releasing next chunck")
|
|
self.feed_tar2(filename, input_pipe)
|
|
|
|
self.tar2_current_file = filename
|
|
|
|
self.tar2_feeder.wait()
|
|
# check if any process failed
|
|
processes = {
|
|
'target': self.tar2_feeder,
|
|
'vmproc': self.vmproc,
|
|
'addproc': self.tar2_process,
|
|
'data_import': self.import_process,
|
|
'decryptor': self.decryptor_process,
|
|
}
|
|
self.check_processes(processes)
|
|
self.tar2_feeder = None
|
|
|
|
if callable(self.progress_callback):
|
|
self.progress_callback(os.path.getsize(filename))
|
|
|
|
# Delete the file as we don't need it anymore
|
|
self.log.debug('Removing file %s', 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):
|
|
'''Generate a list of supported hmac algorithms
|
|
|
|
:param hmac_algorithm: default algorithm, if given, it is placed as a
|
|
first element
|
|
'''
|
|
# Start with provided default
|
|
if hmac_algorithm:
|
|
yield hmac_algorithm
|
|
if hmac_algorithm != 'scrypt':
|
|
yield 'scrypt'
|
|
proc = subprocess.Popen(['openssl', 'list-message-digest-algorithms'],
|
|
stdout=subprocess.PIPE)
|
|
try:
|
|
for algo in proc.stdout.readlines():
|
|
algo = algo.decode('ascii')
|
|
if '=>' in algo:
|
|
continue
|
|
yield algo.strip()
|
|
finally:
|
|
proc.terminate()
|
|
proc.wait()
|
|
proc.stdout.close()
|
|
|
|
class BackupRestoreOptions(object):
|
|
'''Options for restore operation'''
|
|
# pylint: disable=too-few-public-methods
|
|
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
|
|
#: 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
|
|
#: ignore size limit calculated from backup metadata
|
|
self.ignore_size_limit = False
|
|
|
|
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):
|
|
'''Information about a single VM to be restored'''
|
|
# pylint: disable=too-few-public-methods
|
|
#: 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):
|
|
assert isinstance(vm, BackupVM)
|
|
self.vm = vm
|
|
self.name = vm.name
|
|
self.subdir = vm.backup_path
|
|
self.size = vm.size
|
|
self.problems = set()
|
|
self.template = vm.template
|
|
if vm.properties.get('netvm', None):
|
|
self.netvm = vm.properties['netvm']
|
|
else:
|
|
self.netvm = None
|
|
self.orig_template = None
|
|
self.restored_vm = None
|
|
|
|
@property
|
|
def good_to_go(self):
|
|
'''Is the VM ready for restore?'''
|
|
return len(self.problems) == 0
|
|
|
|
class Dom0ToRestore(VMToRestore):
|
|
'''Information about dom0 home to restore'''
|
|
# pylint: disable=too-few-public-methods
|
|
#: 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
|
|
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('qubesadmin.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 _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')
|
|
vmproc.stdin.write(
|
|
(self.backup_location.replace("\r", "").replace("\n",
|
|
"") + "\n").encode())
|
|
vmproc.stdin.flush()
|
|
|
|
# Send to tar2qfile the VMs that should be extracted
|
|
vmproc.stdin.write((" ".join(filelist) + "\n").encode())
|
|
vmproc.stdin.flush()
|
|
self.processes_to_kill_on_cancel.append(vmproc)
|
|
|
|
backup_stdin = vmproc.stdout
|
|
# FIXME use /usr/lib/qubes/qfile-unpacker in non-dom0
|
|
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',
|
|
'--occurrence=1',
|
|
'-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)
|
|
backup_stdin.close()
|
|
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):
|
|
'''Verify hmac of a file using given algorithm.
|
|
|
|
If algorithm is not specified, use the one from backup header (
|
|
:py:attr:`header_data`).
|
|
|
|
Raise :py:exc:`QubesException` on failure, return :py:obj:`True` on
|
|
success.
|
|
|
|
'scrypt' algorithm is supported only for header file; hmac file is
|
|
encrypted (and integrity protected) version of plain header.
|
|
|
|
:param filename: path to file to be verified
|
|
:param hmacfile: path to hmac file for *filename*
|
|
:param algorithm: override algorithm
|
|
'''
|
|
def load_hmac(hmac_text):
|
|
'''Parse hmac output by openssl.
|
|
|
|
Return just hmac, without filename and other metadata.
|
|
'''
|
|
if any(ord(x) not in range(128) for x in hmac_text):
|
|
raise QubesException(
|
|
"Invalid content of {}".format(hmacfile))
|
|
hmac_text = hmac_text.strip().split("=")
|
|
if len(hmac_text) > 1:
|
|
hmac_text = hmac_text[1].strip()
|
|
else:
|
|
raise 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 %s", filename)
|
|
|
|
if os.stat(os.path.join(self.tmpdir, hmacfile)).st_size > \
|
|
HMAC_MAX_SIZE:
|
|
raise QubesException('HMAC file {} too large'.format(
|
|
hmacfile))
|
|
|
|
if hmacfile != filename + ".hmac":
|
|
raise QubesException(
|
|
"ERROR: expected hmac for {}, but got {}".
|
|
format(filename, hmacfile))
|
|
|
|
if algorithm == 'scrypt':
|
|
# in case of 'scrypt' _verify_hmac is only used for backup header
|
|
assert filename == HEADER_FILENAME
|
|
self._verify_and_decrypt(hmacfile, HEADER_FILENAME + '.dec')
|
|
f_name = os.path.join(self.tmpdir, filename)
|
|
with open(f_name, 'rb') as f_one:
|
|
with open(f_name + '.dec', 'rb') as f_two:
|
|
if f_one.read() != f_two.read():
|
|
raise QubesException(
|
|
'Invalid hmac on {}'.format(filename))
|
|
else:
|
|
return True
|
|
|
|
with open(os.path.join(self.tmpdir, filename), 'rb') as f_input:
|
|
hmac_proc = subprocess.Popen(
|
|
["openssl", "dgst", "-" + algorithm, "-hmac", passphrase],
|
|
stdin=f_input,
|
|
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
hmac_stdout, hmac_stderr = hmac_proc.communicate()
|
|
|
|
if hmac_stderr:
|
|
raise QubesException(
|
|
"ERROR: verify file {0}: {1}".format(filename, hmac_stderr))
|
|
else:
|
|
self.log.debug("Loading hmac for file %s", filename)
|
|
try:
|
|
with open(os.path.join(self.tmpdir, hmacfile), 'r',
|
|
encoding='ascii') as f_hmac:
|
|
hmac = load_hmac(f_hmac.read())
|
|
except UnicodeDecodeError as err:
|
|
raise QubesException('Cannot load hmac file: ' + str(err))
|
|
if hmac and load_hmac(hmac_stdout.decode('ascii')) == hmac:
|
|
os.unlink(os.path.join(self.tmpdir, hmacfile))
|
|
self.log.debug(
|
|
"File verification OK -> Sending file %s", filename)
|
|
return True
|
|
else:
|
|
raise QubesException(
|
|
"ERROR: invalid hmac for file {0}: {1}. "
|
|
"Is the passphrase correct?".
|
|
format(filename, load_hmac(hmac_stdout.decode('ascii'))))
|
|
|
|
def _verify_and_decrypt(self, filename, output=None):
|
|
'''Handle scrypt-wrapped file
|
|
|
|
Decrypt the file, and verify its integrity - both tasks handled by
|
|
'scrypt' tool. Filename (without extension) is also validated.
|
|
|
|
:param filename: Input file name (relative to :py:attr:`tmpdir`),
|
|
needs to have `.enc` or `.hmac` extension
|
|
:param output: Output file name (relative to :py:attr:`tmpdir`),
|
|
use :py:obj:`None` to use *filename* without extension
|
|
:return: *filename* without extension
|
|
'''
|
|
assert filename.endswith('.enc') or filename.endswith('.hmac')
|
|
fullname = os.path.join(self.tmpdir, filename)
|
|
(origname, _) = os.path.splitext(filename)
|
|
if output:
|
|
fulloutput = os.path.join(self.tmpdir, output)
|
|
else:
|
|
fulloutput = os.path.join(self.tmpdir, origname)
|
|
if origname == HEADER_FILENAME:
|
|
passphrase = u'{filename}!{passphrase}'.format(
|
|
filename=origname,
|
|
passphrase=self.passphrase)
|
|
else:
|
|
passphrase = u'{backup_id}!{filename}!{passphrase}'.format(
|
|
backup_id=self.header_data.backup_id,
|
|
filename=origname,
|
|
passphrase=self.passphrase)
|
|
try:
|
|
p = launch_scrypt('dec', fullname, fulloutput, passphrase)
|
|
except OSError as err:
|
|
raise QubesException('failed to decrypt {}: {!s}'.format(
|
|
fullname, err))
|
|
(_, stderr) = p.communicate()
|
|
if hasattr(p, 'pty'):
|
|
p.pty.close()
|
|
if p.returncode != 0:
|
|
os.unlink(fulloutput)
|
|
raise QubesException('failed to decrypt {}: {}'.format(
|
|
fullname, stderr))
|
|
# encrypted file is no longer needed
|
|
os.unlink(fullname)
|
|
return origname
|
|
|
|
def _retrieve_backup_header_files(self, files, allow_none=False):
|
|
'''Retrieve backup header.
|
|
|
|
Start retrieval process (possibly involving network access from
|
|
another VM). Returns a collection of retrieved file paths.
|
|
'''
|
|
(retrieve_proc, filelist_pipe, error_pipe) = \
|
|
self._start_retrieval_process(
|
|
files, len(files), 1024 * 1024)
|
|
filelist = filelist_pipe.read()
|
|
filelist_pipe.close()
|
|
retrieve_proc_returncode = retrieve_proc.wait()
|
|
if retrieve_proc in self.processes_to_kill_on_cancel:
|
|
self.processes_to_kill_on_cancel.remove(retrieve_proc)
|
|
extract_stderr = error_pipe.read(MAX_STDERR_BYTES)
|
|
error_pipe.close()
|
|
|
|
# wait for other processes (if any)
|
|
for proc in self.processes_to_kill_on_cancel:
|
|
if proc.wait() != 0:
|
|
raise QubesException(
|
|
"Backup header retrieval failed (exit code {})".format(
|
|
proc.wait())
|
|
)
|
|
|
|
if retrieve_proc_returncode != 0:
|
|
if not filelist and 'Not found in archive' in extract_stderr:
|
|
if allow_none:
|
|
return None
|
|
else:
|
|
raise QubesException(
|
|
"unable to read the qubes backup file {0} ({1}): {2}".
|
|
format(
|
|
self.backup_location,
|
|
retrieve_proc.wait(),
|
|
extract_stderr
|
|
))
|
|
actual_files = filelist.decode('ascii').splitlines()
|
|
if sorted(actual_files) != sorted(files):
|
|
raise QubesException(
|
|
'unexpected files in archive: got {!r}, expected {!r}'.format(
|
|
actual_files, files
|
|
))
|
|
for fname in files:
|
|
if not os.path.exists(os.path.join(self.tmpdir, fname)):
|
|
if allow_none:
|
|
return None
|
|
else:
|
|
raise QubesException(
|
|
'Unable to retrieve file {} from backup {}: {}'.format(
|
|
fname, self.backup_location, extract_stderr
|
|
)
|
|
)
|
|
return files
|
|
|
|
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
|
|
|
|
header_files = self._retrieve_backup_header_files(
|
|
['backup-header', 'backup-header.hmac'], allow_none=True)
|
|
|
|
if not header_files:
|
|
# R2-Beta3 didn't have backup header, so if none is found,
|
|
# assume it's version=2 and use values present at that time
|
|
header_data = BackupHeader(
|
|
version=2,
|
|
# place explicitly this value, because it is what format_version
|
|
# 2 have
|
|
hmac_algorithm='SHA1',
|
|
crypto_algorithm='aes-256-cbc',
|
|
# TODO: set encrypted to something...
|
|
)
|
|
else:
|
|
filename = HEADER_FILENAME
|
|
hmacfile = HEADER_FILENAME + '.hmac'
|
|
self.log.debug("Got backup header and hmac: %s, %s",
|
|
filename, hmacfile)
|
|
|
|
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
|
|
break
|
|
except QubesException as err:
|
|
self.log.debug(
|
|
'Failed to verify %s using %s: %r',
|
|
hmacfile, hmac_algo, err)
|
|
# Ignore exception here, try the next algo
|
|
if not file_ok:
|
|
raise QubesException(
|
|
"Corrupted backup header (hmac verification "
|
|
"failed). Is the password correct?")
|
|
filename = os.path.join(self.tmpdir, filename)
|
|
with open(filename, 'rb') as f_header:
|
|
header_data = BackupHeader(f_header.read())
|
|
os.unlink(filename)
|
|
|
|
return header_data
|
|
|
|
def _start_inner_extraction_worker(self, queue, handlers):
|
|
"""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,
|
|
'handlers': handlers,
|
|
}
|
|
self.log.debug(
|
|
'Starting extraction worker in %s, file handlers map: %s',
|
|
self.tmpdir, repr(handlers))
|
|
format_version = self.header_data.version
|
|
if format_version in [3, 4]:
|
|
extractor_params['compression_filter'] = \
|
|
self.header_data.compression_filter
|
|
if format_version == 4:
|
|
# encryption already handled
|
|
extractor_params['encrypted'] = False
|
|
extract_proc = ExtractWorker3(**extractor_params)
|
|
else:
|
|
raise NotImplementedError(
|
|
"Backup format version %d not supported" % format_version)
|
|
extract_proc.start()
|
|
return extract_proc
|
|
|
|
@staticmethod
|
|
def _save_qubes_xml(path, stream):
|
|
'''Handler for qubes.xml.000 content - just save the data to a file'''
|
|
with open(path, 'wb') as f_qubesxml:
|
|
f_qubesxml.write(stream.read())
|
|
|
|
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:
|
|
raise NotImplementedError('Backup format version 1 not supported')
|
|
elif self.header_data.version in [2, 3]:
|
|
self._retrieve_backup_header_files(
|
|
['qubes.xml.000', 'qubes.xml.000.hmac'])
|
|
self._verify_hmac("qubes.xml.000", "qubes.xml.000.hmac")
|
|
else:
|
|
self._retrieve_backup_header_files(['qubes.xml.000.enc'])
|
|
self._verify_and_decrypt('qubes.xml.000.enc')
|
|
|
|
queue = Queue()
|
|
queue.put("qubes.xml.000")
|
|
queue.put(QUEUE_FINISHED)
|
|
|
|
qubes_xml_path = os.path.join(self.tmpdir, 'qubes-restored.xml')
|
|
handlers = {
|
|
'qubes.xml': (
|
|
functools.partial(self._save_qubes_xml, qubes_xml_path),
|
|
None)
|
|
}
|
|
extract_proc = self._start_inner_extraction_worker(queue, handlers)
|
|
extract_proc.join()
|
|
if extract_proc.exitcode != 0:
|
|
raise QubesException(
|
|
"unable to extract the qubes backup. "
|
|
"Check extracting process errors.")
|
|
|
|
if self.header_data.version in [2, 3]:
|
|
backup_app = Core2Qubes(qubes_xml_path)
|
|
elif self.header_data.version in [4]:
|
|
backup_app = Core3Qubes(qubes_xml_path)
|
|
else:
|
|
raise QubesException(
|
|
'Unsupported qubes.xml format version: {}'.format(
|
|
self.header_data.version))
|
|
# Not needed anymore - all the data stored in backup_app
|
|
os.unlink(qubes_xml_path)
|
|
return backup_app
|
|
|
|
def _restore_vm_data(self, vms_dirs, vms_size, handlers):
|
|
'''Restore data of VMs
|
|
|
|
:param vms_dirs: list of directories to extract (skip others)
|
|
:param vms_size: expected size (abort if source stream exceed this
|
|
value)
|
|
:param handlers: handlers for restored files - see
|
|
:py:class:`ExtractWorker3` for details
|
|
'''
|
|
# 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))))
|
|
|
|
if self.options.ignore_size_limit:
|
|
limit_count = '0'
|
|
vms_size = 0
|
|
self.log.debug("Working in temporary dir: %s", self.tmpdir)
|
|
self.log.info("Extracting data: %s to restore", size_to_human(vms_size))
|
|
|
|
# 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, handlers)
|
|
|
|
try:
|
|
filename = None
|
|
hmacfile = 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().decode('ascii').strip()
|
|
|
|
self.log.debug("Getting new file: %s", filename)
|
|
|
|
if not filename or filename == "EOF":
|
|
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().decode('ascii').strip()
|
|
|
|
if self.header_data.version in [2, 3]:
|
|
if not self.backup_vm:
|
|
hmacfile = nextfile
|
|
nextfile = filelist_pipe.readline().\
|
|
decode('ascii').strip()
|
|
else:
|
|
hmacfile = filelist_pipe.readline().\
|
|
decode('ascii').strip()
|
|
|
|
if self.canceled:
|
|
break
|
|
|
|
self.log.debug("Getting hmac: %s", hmacfile)
|
|
if not hmacfile or hmacfile == "EOF":
|
|
# Premature end of archive, either of tar1_command or
|
|
# vmproc exited with error
|
|
break
|
|
else: # self.header_data.version == 4
|
|
if not filename.endswith('.enc'):
|
|
raise qubesadmin.exc.QubesException(
|
|
'Invalid file extension found in archive: {}'.
|
|
format(filename))
|
|
|
|
if not any(filename.startswith(x) for x in vms_dirs):
|
|
self.log.debug("Ignoring VM not selected for restore")
|
|
os.unlink(os.path.join(self.tmpdir, filename))
|
|
if hmacfile:
|
|
os.unlink(os.path.join(self.tmpdir, hmacfile))
|
|
continue
|
|
|
|
if self.header_data.version in [2, 3]:
|
|
self._verify_hmac(filename, hmacfile)
|
|
else:
|
|
# _verify_and_decrypt will write output to a file with
|
|
# '.enc' extension cut off. This is safe because:
|
|
# - `scrypt` tool will override output, so if the file was
|
|
# already there (received from the VM), it will be removed
|
|
# - incoming archive extraction will refuse to override
|
|
# existing file, so if `scrypt` already created one,
|
|
# it can not be manipulated by the VM
|
|
# - when the file is retrieved from the VM, it appears at
|
|
# the final form - if it's visible, VM have no longer
|
|
# influence over its content
|
|
#
|
|
# This all means that if the file was correctly verified
|
|
# + decrypted, we will surely access the right file
|
|
filename = self._verify_and_decrypt(filename)
|
|
to_extract.put(os.path.join(self.tmpdir, filename))
|
|
|
|
if self.canceled:
|
|
raise BackupCanceledError("Restore canceled",
|
|
tmpdir=self.tmpdir)
|
|
|
|
if retrieve_proc.wait() != 0:
|
|
if retrieve_proc.returncode == errno.EDQUOT:
|
|
raise QubesException(
|
|
'retrieved backup size exceed expected size, if you '
|
|
'believe this is ok, use --ignore-size-limit option')
|
|
else:
|
|
raise QubesException(
|
|
"unable to read the qubes backup file {} ({}): {}"
|
|
.format(self.backup_location,
|
|
retrieve_proc.returncode, 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 QubesException(
|
|
"Backup completed, "
|
|
"but VM sending it reported an error (exit code {})".
|
|
format(proc.returncode))
|
|
|
|
if filename and filename != "EOF":
|
|
raise 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)
|
|
finally:
|
|
error_pipe.close()
|
|
filelist_pipe.close()
|
|
|
|
self.log.debug("Waiting for the extraction process to finish...")
|
|
extract_proc.join()
|
|
self.log.debug("Extraction process finished with code: %s",
|
|
extract_proc.exitcode)
|
|
if extract_proc.exitcode != 0:
|
|
raise QubesException(
|
|
"unable to extract the qubes backup. "
|
|
"Check extracting process errors.")
|
|
|
|
def new_name_for_conflicting_vm(self, orig_name, restore_info):
|
|
'''Generate new name for conflicting VM
|
|
|
|
Add a number suffix, until the name is unique. If no unique name can
|
|
be found using this strategy, return :py:obj:`None`
|
|
'''
|
|
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 [x.name for x in 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):
|
|
'''Verify restore info - validate VM dependencies, name conflicts
|
|
etc.
|
|
'''
|
|
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.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
|
|
present_on_host = (host_template and
|
|
isinstance(host_template, qubesadmin.vm.TemplateVM))
|
|
present_in_backup = (template_name in restore_info.keys() and
|
|
restore_info[template_name].good_to_go and
|
|
restore_info[template_name].vm.klass ==
|
|
'TemplateVM')
|
|
if not present_on_host and not present_in_backup:
|
|
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 vm_info.vm.properties.get('netvm', None) is not None:
|
|
netvm_name = vm_info.netvm
|
|
|
|
try:
|
|
netvm_on_host = self.app.domains[netvm_name]
|
|
except KeyError:
|
|
netvm_on_host = None
|
|
|
|
present_on_host = (netvm_on_host is not None
|
|
and netvm_on_host.provides_network)
|
|
present_in_backup = (netvm_name in restore_info.keys() and
|
|
restore_info[netvm_name].good_to_go and
|
|
restore_info[netvm_name].vm.properties.get(
|
|
'provides_network', False))
|
|
if not present_on_host and not present_in_backup:
|
|
if self.options.use_default_netvm:
|
|
del vm_info.vm.properties['netvm']
|
|
elif self.options.use_none_netvm:
|
|
vm_info.netvm = None
|
|
else:
|
|
vm_info.problems.add(self.VMToRestore.MISSING_NETVM)
|
|
|
|
return restore_info
|
|
|
|
def get_restore_info(self):
|
|
'''Get restore info
|
|
|
|
Return information about what is included in the backup.
|
|
That dictionary can be adjusted to select what VM should be restore.
|
|
'''
|
|
# Format versions:
|
|
# 1 - Qubes R1, Qubes R2 beta1, beta2
|
|
# 2 - Qubes R2 beta3+
|
|
# 3 - Qubes R2+
|
|
# 4 - Qubes R4+
|
|
|
|
vms_to_restore = {}
|
|
|
|
for vm in self.backup_app.domains.values():
|
|
if vm.klass == 'AdminVM':
|
|
# Handle dom0 as special case later
|
|
continue
|
|
if vm.included_in_backup:
|
|
self.log.debug("%s is included in backup", vm.name)
|
|
|
|
vms_to_restore[vm.name] = self.VMToRestore(vm)
|
|
|
|
if vm.template is not None:
|
|
templatevm_name = vm.template
|
|
vms_to_restore[vm.name].template = templatevm_name
|
|
|
|
vms_to_restore = self.restore_info_verify(vms_to_restore)
|
|
|
|
# ...and dom0 home
|
|
if self.options.dom0_home and \
|
|
self.backup_app.domains['dom0'].included_in_backup:
|
|
vm = self.backup_app.domains['dom0']
|
|
vms_to_restore['dom0'] = self.Dom0ToRestore(vm)
|
|
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):
|
|
'''Return a ASCII formatted table with restore info summary'''
|
|
fields = {
|
|
"name": {'func': lambda vm: vm.name},
|
|
|
|
"type": {'func': lambda vm: vm.klass},
|
|
|
|
"template": {'func': lambda vm:
|
|
'n/a' if vm.template is None else vm.template},
|
|
|
|
"netvm": {'func': lambda vm:
|
|
'(default)' if 'netvm' not in vm.properties else
|
|
'-' if vm.properties['netvm'] is None else
|
|
vm.properties['netvm']},
|
|
|
|
"label": {'func': lambda vm: vm.label},
|
|
}
|
|
|
|
fields_to_display = ['name', 'type', 'template',
|
|
'netvm', 'label']
|
|
|
|
# First calculate the maximum width of each field we want to display
|
|
total_width = 0
|
|
for field in fields_to_display:
|
|
fields[field]['max_width'] = len(field)
|
|
for vm_info in restore_info.values():
|
|
if vm_info.vm:
|
|
# noinspection PyUnusedLocal
|
|
field_len = len(str(fields[field]["func"](vm_info.vm)))
|
|
if field_len > fields[field]['max_width']:
|
|
fields[field]['max_width'] = field_len
|
|
total_width += fields[field]['max_width']
|
|
|
|
summary = ""
|
|
summary += "The following VMs are included in the backup:\n"
|
|
summary += "\n"
|
|
|
|
# Display the header
|
|
for field in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:-^{0}}}-+".format(fields[field]["max_width"] + 1)
|
|
summary += fmt.format('-')
|
|
summary += "\n"
|
|
for field in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:>{0}}} |".format(fields[field]["max_width"] + 1)
|
|
summary += fmt.format(field)
|
|
summary += "\n"
|
|
for field in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:-^{0}}}-+".format(fields[field]["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
|
|
summary_line = ""
|
|
for field in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:>{0}}} |".format(fields[field]["max_width"] + 1)
|
|
summary_line += fmt.format(fields[field]["func"](vm_info.vm))
|
|
|
|
if BackupRestore.VMToRestore.EXCLUDED in vm_info.problems:
|
|
summary_line += " <-- Excluded from restore"
|
|
elif BackupRestore.VMToRestore.ALREADY_EXISTS in vm_info.problems:
|
|
summary_line += \
|
|
" <-- A VM with the same name already exists on the host!"
|
|
elif BackupRestore.VMToRestore.MISSING_TEMPLATE in \
|
|
vm_info.problems:
|
|
summary_line += " <-- No matching template on the host " \
|
|
"or in the backup found!"
|
|
elif BackupRestore.VMToRestore.MISSING_NETVM in \
|
|
vm_info.problems:
|
|
summary_line += " <-- No matching netvm on the host " \
|
|
"or in the backup found!"
|
|
else:
|
|
if vm_info.template != vm_info.vm.template:
|
|
summary_line += " <-- Template change to '{}'".format(
|
|
vm_info.template)
|
|
if vm_info.name != vm_info.vm.name:
|
|
summary_line += " <-- Will be renamed to '{}'".format(
|
|
vm_info.name)
|
|
|
|
summary += summary_line + "\n"
|
|
|
|
if 'dom0' in restore_info.keys():
|
|
summary_line = ""
|
|
for field in fields_to_display:
|
|
# noinspection PyTypeChecker
|
|
fmt = "{{0:>{0}}} |".format(fields[field]["max_width"] + 1)
|
|
if field == "name":
|
|
summary_line += fmt.format("Dom0")
|
|
elif field == "type":
|
|
summary_line += fmt.format("Home")
|
|
else:
|
|
summary_line += fmt.format("")
|
|
if BackupRestore.Dom0ToRestore.USERNAME_MISMATCH in \
|
|
restore_info['dom0'].problems:
|
|
summary_line += " <-- username in backup and dom0 mismatch"
|
|
|
|
summary += summary_line + "\n"
|
|
|
|
return summary
|
|
|
|
@staticmethod
|
|
def _templates_first(vms):
|
|
'''Sort templates befor other VM types (AppVM etc)'''
|
|
def key_function(instance):
|
|
'''Key function for :py:func:`sorted`'''
|
|
if isinstance(instance, BackupVM):
|
|
return instance.klass == 'TemplateVM'
|
|
elif hasattr(instance, 'vm'):
|
|
return key_function(instance.vm)
|
|
return 0
|
|
return sorted(vms,
|
|
key=key_function,
|
|
reverse=True)
|
|
|
|
|
|
def _handle_dom0(self, backup_path):
|
|
'''Extract dom0 home'''
|
|
local_user = grp.getgrnam('qubes').gr_mem[0]
|
|
home_dir = pwd.getpwnam(local_user).pw_dir
|
|
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 '%s'...", local_user)
|
|
self.log.info("Existing files/dirs backed up in '%s' dir",
|
|
restore_home_backupdir)
|
|
os.mkdir(home_dir + '/' + restore_home_backupdir)
|
|
for f_name in os.listdir(backup_dom0_home_dir):
|
|
home_file = home_dir + '/' + f_name
|
|
if os.path.exists(home_file):
|
|
os.rename(home_file,
|
|
home_dir + '/' + restore_home_backupdir + '/' + f_name)
|
|
if self.header_data.version == 1:
|
|
subprocess.call(
|
|
["cp", "-nrp", "--reflink=auto",
|
|
backup_dom0_home_dir + '/' + f_name, home_file])
|
|
elif self.header_data.version >= 2:
|
|
shutil.move(backup_dom0_home_dir + '/' + f_name, home_file)
|
|
retcode = subprocess.call(['sudo', 'chown', '-R',
|
|
local_user, home_dir])
|
|
if retcode != 0:
|
|
self.log.error("*** Error while setting home directory owner")
|
|
|
|
def _handle_appmenus_list(self, vm, stream):
|
|
'''Handle whitelisted-appmenus.list file'''
|
|
try:
|
|
subprocess.check_call(
|
|
['qvm-appmenus', '--set-whitelist=-', vm.name],
|
|
stdin=stream)
|
|
except subprocess.CalledProcessError:
|
|
self.log.error('Failed to set application list for %s', vm.name)
|
|
|
|
def _handle_volume_data(self, vm, volume, stream):
|
|
'''Wrap volume data import with logging'''
|
|
try:
|
|
volume.import_data(stream)
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Failed to restore volume %s of VM %s: %s',
|
|
volume.name, vm.name, err)
|
|
|
|
def _handle_volume_size(self, vm, volume, size):
|
|
'''Wrap volume resize with logging'''
|
|
try:
|
|
volume.resize(size)
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Failed to resize volume %s of VM %s: %s',
|
|
volume.name, vm.name, err)
|
|
|
|
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:
|
|
'''
|
|
|
|
if self.header_data.version == 1:
|
|
raise NotImplementedError('Backup format version 1 not supported')
|
|
|
|
restore_info = self.restore_info_verify(restore_info)
|
|
|
|
self._restore_vms_metadata(restore_info)
|
|
|
|
# Perform VM restoration in backup order
|
|
vms_dirs = []
|
|
handlers = {}
|
|
vms_size = 0
|
|
for vm_info in self._templates_first(restore_info.values()):
|
|
vm = vm_info.restored_vm
|
|
if vm and vm_info.subdir:
|
|
vms_size += int(vm_info.size)
|
|
vms_dirs.append(vm_info.subdir)
|
|
for name, volume in vm.volumes.items():
|
|
if not volume.save_on_stop:
|
|
continue
|
|
data_func = functools.partial(
|
|
self._handle_volume_data, vm, volume)
|
|
size_func = functools.partial(
|
|
self._handle_volume_size, vm, volume)
|
|
handlers[os.path.join(vm_info.subdir, name + '.img')] = \
|
|
(data_func, size_func)
|
|
handlers[os.path.join(vm_info.subdir, 'firewall.xml')] = (
|
|
functools.partial(vm_info.vm.handle_firewall_xml, vm), None)
|
|
handlers[os.path.join(vm_info.subdir,
|
|
'whitelisted-appmenus.list')] = (
|
|
functools.partial(self._handle_appmenus_list, vm), None)
|
|
|
|
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
|
|
handlers[restore_info['dom0'].subdir] = (self._handle_dom0, None)
|
|
try:
|
|
self._restore_vm_data(vms_dirs=vms_dirs, vms_size=vms_size,
|
|
handlers=handlers)
|
|
except QubesException as err:
|
|
if self.options.verify_only:
|
|
raise
|
|
else:
|
|
self.log.error('Error extracting data: ' + str(err))
|
|
self.log.warning(
|
|
"Continuing anyway to restore at least some VMs")
|
|
|
|
if self.options.verify_only:
|
|
shutil.rmtree(self.tmpdir)
|
|
return
|
|
|
|
if self.canceled:
|
|
raise BackupCanceledError("Restore canceled",
|
|
tmpdir=self.tmpdir)
|
|
|
|
shutil.rmtree(self.tmpdir)
|
|
self.log.info("-> Done. Please install updates for all the restored "
|
|
"templates.")
|
|
|
|
def _restore_vms_metadata(self, restore_info):
|
|
'''Restore VM metadata
|
|
|
|
Create VMs, set their properties etc.
|
|
'''
|
|
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:
|
|
return
|
|
self.log.info("-> Restoring %s...", vm.name)
|
|
kwargs = {}
|
|
if 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 create VMs, later setting may require other VMs
|
|
# be already created
|
|
new_vm = self.app.add_new_vm(
|
|
vm.klass,
|
|
name=vm_name,
|
|
label=vm.label,
|
|
pool=self.options.override_pool,
|
|
**kwargs)
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Error restoring VM %s, skipping: %s',
|
|
vm.name, err)
|
|
if new_vm:
|
|
del self.app.domains[new_vm.name]
|
|
continue
|
|
|
|
restore_info[vm.name].restored_vm = new_vm
|
|
|
|
for vm in vms.values():
|
|
if self.canceled:
|
|
return
|
|
|
|
new_vm = restore_info[vm.name].restored_vm
|
|
if not new_vm:
|
|
# skipped/failed
|
|
continue
|
|
|
|
for prop, value in vm.properties.items():
|
|
# exclude VM references - handled manually according to
|
|
# restore options
|
|
if prop in ['template', 'netvm', 'default_dispvm']:
|
|
continue
|
|
try:
|
|
setattr(new_vm, prop, value)
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Error setting %s.%s to %s: %s',
|
|
vm.name, prop, value, err)
|
|
|
|
for feature, value in vm.features.items():
|
|
try:
|
|
new_vm.features[feature] = value
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Error setting %s.features[%s] to %s: %s',
|
|
vm.name, feature, value, err)
|
|
|
|
for tag in vm.tags:
|
|
try:
|
|
new_vm.tags.add(tag)
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Error adding tag %s to %s: %s',
|
|
tag, vm.name, err)
|
|
|
|
for bus in vm.devices:
|
|
for backend_domain, ident in vm.devices[bus]:
|
|
options = vm.devices[bus][(backend_domain, ident)]
|
|
assignment = DeviceAssignment(
|
|
backend_domain=backend_domain,
|
|
ident=ident,
|
|
options=options,
|
|
persistent=True)
|
|
try:
|
|
new_vm.devices[bus].attach(assignment)
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Error attaching device %s:%s to %s: %s',
|
|
bus, ident, vm.name, err)
|
|
|
|
# Set VM dependencies - only non-default 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 'netvm' in vm.properties:
|
|
if vm_info.netvm in restore_info:
|
|
value = restore_info[vm_info.netvm].name
|
|
else:
|
|
value = vm_info.netvm
|
|
|
|
try:
|
|
host_vm.netvm = value
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Error setting %s.%s to %s: %s',
|
|
vm.name, 'netvm', value, err)
|
|
|
|
if 'default_dispvm' in vm.properties:
|
|
if vm.properties['default_dispvm'] in restore_info:
|
|
value = restore_info[vm.properties[
|
|
'default_dispvm']].name
|
|
else:
|
|
value = vm.properties['default_dispvm']
|
|
|
|
try:
|
|
host_vm.default_dispvm = value
|
|
except Exception as err: # pylint: disable=broad-except
|
|
self.log.error('Error setting %s.%s to %s: %s',
|
|
vm.name, 'default_dispvm', value, err)
|