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core-admin/core/backup.py
Marek Marczykowski-Górecki bdae560770 backup: fix deadlock on error while receiving backup from a VM 
When qfile-dom0-unpacker detects an error, it sends error report to
stdout and terminate (so stdout is closed). That close should be
transferred to the VM process (as EOF on its stdin), which will signal
it to stop sending the data and handle error report.
Also qrexec-client holds the connection until both stdin and
stdout are closed.
So when that EOF is missing, tar2qfile will not detect error report and
still tries to send the data and qrexec-client will hold the
connection while receiving process is long dead.

To prevent that deadlock from happening, close FD in python code, so
qfile-dom0-unpacker will be the last owner of write end of the pipe.
When it closes its stdout, qrexec-client will receive EOF at its stdin.
2015-02-18 21:41:22 +01:00

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#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# The Qubes OS Project, http://www.qubes-os.org
#
# Copyright (C) 2013 Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
# Copyright (C) 2013 Olivier Médoc <o_medoc@yahoo.fr>
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#
#
from __future__ import unicode_literals
from qubes import QubesException,QubesVmCollection
from qubes import QubesVmClasses
from qubes import system_path,vm_files
from qubesutils import size_to_human, print_stdout, print_stderr, get_disk_usage
import sys
import os
import fcntl
import subprocess
import re
import shutil
import tempfile
import time
import grp,pwd
import errno
import datetime
from multiprocessing import Queue,Process
BACKUP_DEBUG = False
HEADER_FILENAME = 'backup-header'
DEFAULT_CRYPTO_ALGORITHM = 'aes-256-cbc'
DEFAULT_HMAC_ALGORITHM = 'SHA512'
DEFAULT_COMPRESSION_FILTER = 'gzip'
CURRENT_BACKUP_FORMAT_VERSION = '3'
# Maximum size of error message get from process stderr (including VM process)
MAX_STDERR_BYTES = 1024
# header + qubes.xml max size
HEADER_QUBES_XML_MAX_SIZE = 1024 * 1024
# global state for backup_cancel()
running_backup_operation = None
class BackupOperationInfo:
def __init__(self):
self.canceled = False
self.processes_to_kill_on_cancel = []
self.tmpdir_to_remove = None
class BackupCanceledError(QubesException):
def __init__(self, msg, tmpdir=None):
super(BackupCanceledError, self).__init__(msg)
self.tmpdir = tmpdir
class BackupHeader:
version = 'version'
encrypted = 'encrypted'
compressed = 'compressed'
compression_filter = 'compression-filter'
crypto_algorithm = 'crypto-algorithm'
hmac_algorithm = 'hmac-algorithm'
bool_options = ['encrypted', 'compressed']
int_options = ['version']
def file_to_backup (file_path, subdir = None):
sz = get_disk_usage (file_path)
if subdir is None:
abs_file_path = os.path.abspath (file_path)
abs_base_dir = os.path.abspath (system_path["qubes_base_dir"]) + '/'
abs_file_dir = os.path.dirname (abs_file_path) + '/'
(nothing, dir, subdir) = abs_file_dir.partition (abs_base_dir)
assert nothing == ""
assert dir == abs_base_dir
else:
if len(subdir) > 0 and not subdir.endswith('/'):
subdir += '/'
return [ { "path" : file_path, "size": sz, "subdir": subdir} ]
def backup_cancel():
"""
Cancel currently running backup/restore operation
@return: True if any operation was signaled
"""
if running_backup_operation is None:
return False
running_backup_operation.canceled = True
for proc in running_backup_operation.processes_to_kill_on_cancel:
try:
proc.terminate()
except:
pass
return True
def backup_prepare(vms_list = None, exclude_list = None,
print_callback = print_stdout, hide_vm_names=True):
"""If vms = None, include all (sensible) VMs; exclude_list is always applied"""
files_to_backup = file_to_backup (system_path["qubes_store_filename"])
if exclude_list is None:
exclude_list = []
qvm_collection = QubesVmCollection()
qvm_collection.lock_db_for_writing()
qvm_collection.load()
if vms_list is None:
all_vms = [vm for vm in qvm_collection.values()]
selected_vms = [vm for vm in all_vms if vm.include_in_backups]
appvms_to_backup = [vm for vm in selected_vms if vm.is_appvm() and not vm.internal]
netvms_to_backup = [vm for vm in selected_vms if vm.is_netvm() and not vm.qid == 0]
template_vms_worth_backingup = [vm for vm in selected_vms if (vm.is_template() and not vm.installed_by_rpm)]
dom0 = [ qvm_collection[0] ]
vms_list = appvms_to_backup + netvms_to_backup + template_vms_worth_backingup + dom0
vms_for_backup = vms_list
# Apply exclude list
if exclude_list:
vms_for_backup = [vm for vm in vms_list if vm.name not in exclude_list]
no_vms = len (vms_for_backup)
there_are_running_vms = False
fields_to_display = [
{ "name": "VM", "width": 16},
{ "name": "type","width": 12 },
{ "name": "size", "width": 12}
]
# Display the header
s = ""
for f in fields_to_display:
fmt="{{0:-^{0}}}-+".format(f["width"] + 1)
s += fmt.format('-')
print_callback(s)
s = ""
for f in fields_to_display:
fmt="{{0:>{0}}} |".format(f["width"] + 1)
s += fmt.format(f["name"])
print_callback(s)
s = ""
for f in fields_to_display:
fmt="{{0:-^{0}}}-+".format(f["width"] + 1)
s += fmt.format('-')
print_callback(s)
files_to_backup_index = 0
for vm in vms_for_backup:
if vm.is_template():
# handle templates later
continue
if vm.qid == 0:
# handle dom0 later
continue
if hide_vm_names:
subdir = 'vm%d/' % vm.qid
else:
subdir = None
if vm.private_img is not None:
files_to_backup += file_to_backup(vm.private_img, subdir)
if vm.is_appvm():
files_to_backup += file_to_backup(vm.icon_path, subdir)
if vm.updateable:
if os.path.exists(vm.dir_path + "/apps.templates"):
# template
files_to_backup += file_to_backup(vm.dir_path + "/apps.templates", subdir)
else:
# standaloneVM
files_to_backup += file_to_backup(vm.dir_path + "/apps", subdir)
if os.path.exists(vm.dir_path + "/kernels"):
files_to_backup += file_to_backup(vm.dir_path + "/kernels", subdir)
if os.path.exists (vm.firewall_conf):
files_to_backup += file_to_backup(vm.firewall_conf, subdir)
if 'appmenus_whitelist' in vm_files and \
os.path.exists(os.path.join(vm.dir_path, vm_files['appmenus_whitelist'])):
files_to_backup += file_to_backup(
os.path.join(vm.dir_path, vm_files['appmenus_whitelist']),
subdir)
if vm.updateable:
files_to_backup += file_to_backup(vm.root_img, subdir)
s = ""
fmt="{{0:>{0}}} |".format(fields_to_display[0]["width"] + 1)
s += fmt.format(vm.name)
fmt="{{0:>{0}}} |".format(fields_to_display[1]["width"] + 1)
if vm.is_netvm():
s += fmt.format("NetVM" + (" + Sys" if vm.updateable else ""))
else:
s += fmt.format("AppVM" + (" + Sys" if vm.updateable else ""))
vm_size = reduce(lambda x, y: x + y["size"],
files_to_backup[files_to_backup_index:],
0)
files_to_backup_index = len(files_to_backup)
fmt="{{0:>{0}}} |".format(fields_to_display[2]["width"] + 1)
s += fmt.format(size_to_human(vm_size))
if vm.is_running():
s += " <-- The VM is running, please shut it down before proceeding with the backup!"
there_are_running_vms = True
print_callback(s)
for vm in vms_for_backup:
if not vm.is_template():
# already handled
continue
if vm.qid == 0:
# handle dom0 later
continue
vm_sz = vm.get_disk_utilization()
if hide_vm_names:
template_subdir = 'vm%d/' % vm.qid
else:
template_subdir = os.path.relpath(
vm.dir_path,
system_path["qubes_base_dir"]) + '/'
template_to_backup = [ {
"path": vm.dir_path + '/.',
"size": vm_sz,
"subdir": template_subdir } ]
files_to_backup += template_to_backup
s = ""
fmt="{{0:>{0}}} |".format(fields_to_display[0]["width"] + 1)
s += fmt.format(vm.name)
fmt="{{0:>{0}}} |".format(fields_to_display[1]["width"] + 1)
s += fmt.format("Template VM")
fmt="{{0:>{0}}} |".format(fields_to_display[2]["width"] + 1)
s += fmt.format(size_to_human(vm_sz))
if vm.is_running():
s += " <-- The VM is running, please shut it down before proceeding with the backup!"
there_are_running_vms = True
print_callback(s)
# Initialize backup flag on all VMs
vms_for_backup_qid = [vm.qid for vm in vms_for_backup]
for vm in qvm_collection.values():
vm.backup_content = False
if vm.qid == 0:
# handle dom0 later
continue
if vm.qid in vms_for_backup_qid:
vm.backup_content = True
vm.backup_size = vm.get_disk_utilization()
if hide_vm_names:
vm.backup_path = 'vm%d' % vm.qid
else:
vm.backup_path = os.path.relpath(vm.dir_path, system_path["qubes_base_dir"])
# Dom0 user home
if 0 in vms_for_backup_qid:
local_user = grp.getgrnam('qubes').gr_mem[0]
home_dir = pwd.getpwnam(local_user).pw_dir
# Home dir should have only user-owned files, so fix it now to prevent
# permissions problems - some root-owned files can left after
# 'sudo bash' and similar commands
subprocess.check_call(['sudo', 'chown', '-R', local_user, home_dir])
home_sz = get_disk_usage(home_dir)
home_to_backup = [ { "path" : home_dir, "size": home_sz, "subdir": 'dom0-home/'} ]
files_to_backup += home_to_backup
vm = qvm_collection[0]
vm.backup_content = True
vm.backup_size = home_sz
vm.backup_path = os.path.join('dom0-home', os.path.basename(home_dir))
s = ""
fmt="{{0:>{0}}} |".format(fields_to_display[0]["width"] + 1)
s += fmt.format('Dom0')
fmt="{{0:>{0}}} |".format(fields_to_display[1]["width"] + 1)
s += fmt.format("User home")
fmt="{{0:>{0}}} |".format(fields_to_display[2]["width"] + 1)
s += fmt.format(size_to_human(home_sz))
print_callback(s)
qvm_collection.save()
# FIXME: should be after backup completed
qvm_collection.unlock_db()
total_backup_sz = 0
for file in files_to_backup:
total_backup_sz += file["size"]
s = ""
for f in fields_to_display:
fmt="{{0:-^{0}}}-+".format(f["width"] + 1)
s += fmt.format('-')
print_callback(s)
s = ""
fmt="{{0:>{0}}} |".format(fields_to_display[0]["width"] + 1)
s += fmt.format("Total size:")
fmt="{{0:>{0}}} |".format(fields_to_display[1]["width"] + 1 + 2 + fields_to_display[2]["width"] + 1)
s += fmt.format(size_to_human(total_backup_sz))
print_callback(s)
s = ""
for f in fields_to_display:
fmt="{{0:-^{0}}}-+".format(f["width"] + 1)
s += fmt.format('-')
print_callback(s)
vms_not_for_backup = [vm.name for vm in qvm_collection.values() if not vm
.backup_content]
print_callback("VMs not selected for backup: %s" % " ".join(
vms_not_for_backup))
if (there_are_running_vms):
raise QubesException("Please shutdown all VMs before proceeding.")
for fileinfo in files_to_backup:
assert len(fileinfo["subdir"]) == 0 or fileinfo["subdir"][-1] == '/', \
"'subdir' must ends with a '/': %s" % unicode(fileinfo)
return files_to_backup
class SendWorker(Process):
def __init__(self, queue, base_dir, backup_stdout):
super(SendWorker, self).__init__()
self.queue = queue
self.base_dir = base_dir
self.backup_stdout = backup_stdout
def run(self):
if BACKUP_DEBUG:
print "Started sending thread"
if BACKUP_DEBUG:
print "Moving to temporary dir", self.base_dir
os.chdir(self.base_dir)
for filename in iter(self.queue.get,None):
if filename == "FINISHED" or filename == "ERROR":
break
if BACKUP_DEBUG:
print "Sending file", filename
# This tar used for sending data out need to be as simple, as
# simple, as featureless as possible. It will not be
# verified before untaring.
tar_final_cmd = ["tar", "-cO", "--posix",
"-C", self.base_dir, filename]
final_proc = subprocess.Popen (tar_final_cmd,
stdin=subprocess.PIPE, stdout=self.backup_stdout)
if final_proc.wait() >= 2:
# handle only exit code 2 (tar fatal error) or greater (call failed?)
raise QubesException("ERROR: Failed to write the backup, out of disk space? "
"Check console output or ~/.xsession-errors for details.")
# Delete the file as we don't need it anymore
if BACKUP_DEBUG:
print "Removing file", filename
os.remove(filename)
if BACKUP_DEBUG:
print "Finished sending thread"
def prepare_backup_header(target_directory, passphrase, compressed=False,
encrypted=False,
hmac_algorithm=DEFAULT_HMAC_ALGORITHM,
crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM,
compression_filter=None):
header_file_path = os.path.join(target_directory, HEADER_FILENAME)
with open(header_file_path, "w") as f:
f.write(str("%s=%s\n" % (BackupHeader.version,
CURRENT_BACKUP_FORMAT_VERSION)))
f.write(str("%s=%s\n" % (BackupHeader.hmac_algorithm, hmac_algorithm)))
f.write(str("%s=%s\n" % (BackupHeader.crypto_algorithm,
crypto_algorithm)))
f.write(str("%s=%s\n" % (BackupHeader.encrypted, str(encrypted))))
f.write(str("%s=%s\n" % (BackupHeader.compressed, str(compressed))))
if compressed:
f.write(str("%s=%s\n" % (BackupHeader.compression_filter,
str(compression_filter))))
hmac = subprocess.Popen (["openssl", "dgst",
"-" + hmac_algorithm, "-hmac", passphrase],
stdin=open(header_file_path, "r"),
stdout=open(header_file_path + ".hmac", "w"))
if hmac.wait() != 0:
raise QubesException("Failed to compute hmac of header file")
return (HEADER_FILENAME, HEADER_FILENAME+".hmac")
def backup_do(base_backup_dir, files_to_backup, passphrase,
progress_callback = None, encrypted=False, appvm=None,
compressed=False, hmac_algorithm=DEFAULT_HMAC_ALGORITHM,
crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM):
global running_backup_operation
total_backup_sz = 0
passphrase = passphrase.encode('utf-8')
for file in files_to_backup:
total_backup_sz += file["size"]
if isinstance(compressed, str):
compression_filter = compressed
else:
compression_filter = DEFAULT_COMPRESSION_FILTER
running_backup_operation = BackupOperationInfo()
vmproc = None
if appvm != None:
# Prepare the backup target (Qubes service call)
backup_target = "QUBESRPC qubes.Backup dom0"
# If APPVM, STDOUT is a PIPE
vmproc = appvm.run(command=backup_target, passio_popen=True,
passio_stderr=True)
vmproc.stdin.write(base_backup_dir.
replace("\r", "").replace("\n", "")+"\n")
backup_stdout = vmproc.stdin
running_backup_operation.processes_to_kill_on_cancel.append(vmproc)
else:
# Prepare the backup target (local file)
if os.path.isdir(base_backup_dir):
backup_target = base_backup_dir + "/qubes-{0}". \
format(time.strftime("%Y-%m-%dT%H%M%S"))
else:
backup_target = base_backup_dir
# Create the target directory
if not os.path.exists (os.path.dirname(base_backup_dir)):
raise QubesException(
"ERROR: the backup directory for {0} does not exists".
format(base_backup_dir))
# If not APPVM, STDOUT is a local file
backup_stdout = open(backup_target,'wb')
global blocks_backedup
blocks_backedup = 0
if callable(progress_callback):
progress = blocks_backedup * 11 / total_backup_sz
progress_callback(progress)
backup_tmpdir = tempfile.mkdtemp(prefix="/var/tmp/backup_")
running_backup_operation.tmpdir_to_remove = backup_tmpdir
# Tar with tapelength does not deals well with stdout (close stdout between
# two tapes)
# For this reason, we will use named pipes instead
if BACKUP_DEBUG:
print "Working in", backup_tmpdir
backup_pipe = os.path.join(backup_tmpdir, "backup_pipe")
if BACKUP_DEBUG:
print "Creating pipe in:", backup_pipe
os.mkfifo(backup_pipe)
if BACKUP_DEBUG:
print "Will backup:", files_to_backup
header_files = prepare_backup_header(backup_tmpdir, passphrase,
compressed=bool(compressed),
encrypted=encrypted,
hmac_algorithm=hmac_algorithm,
crypto_algorithm=crypto_algorithm,
compression_filter=compression_filter)
# Setup worker to send encrypted data chunks to the backup_target
def compute_progress(new_size, total_backup_sz):
global blocks_backedup
blocks_backedup += new_size
if callable(progress_callback):
progress = blocks_backedup / float(total_backup_sz)
progress_callback(int(round(progress*100,2)))
to_send = Queue(10)
send_proc = SendWorker(to_send, backup_tmpdir, backup_stdout)
send_proc.start()
for f in header_files:
to_send.put(f)
for filename in files_to_backup:
if BACKUP_DEBUG:
print "Backing up", filename
backup_tempfile = os.path.join(backup_tmpdir,
filename["subdir"],
os.path.basename(filename["path"]))
if BACKUP_DEBUG:
print "Using temporary location:", 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(filename["path"]),
'--xform', 's:^%s:%s\\0:' % (
os.path.basename(filename["path"]),
filename["subdir"]),
os.path.basename(filename["path"])
]
if compressed:
tar_cmdline.insert(-1, "--use-compress-program=%s" % compression_filter)
if BACKUP_DEBUG:
print " ".join(tar_cmdline)
# Tips: Popen(bufsize=0)
# Pipe: tar-sparse | encryptor [| hmac] | tar | backup_target
# Pipe: tar-sparse [| hmac] | tar | backup_target
tar_sparse = subprocess.Popen (tar_cmdline, stdin=subprocess.PIPE,
stderr=(open(os.devnull, 'w') if not BACKUP_DEBUG else None))
running_backup_operation.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 encrypted:
# Start encrypt
# If no cipher is provided, the data is forwarded unencrypted !!!
encryptor = subprocess.Popen (["openssl", "enc",
"-e", "-" + 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",
"-" + 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')
common_args = {
'backup_target': chunkfile_p,
'total_backup_sz': total_backup_sz,
'hmac': hmac,
'vmproc': vmproc,
'addproc': tar_sparse,
'progress_callback': compute_progress,
'size_limit': 100 * 1024 * 1024,
}
run_error = wait_backup_feedback(
in_stream=pipe, streamproc=encryptor,
**common_args)
chunkfile_p.close()
if BACKUP_DEBUG:
print "Wait_backup_feedback returned:", run_error
if running_backup_operation.canceled:
try:
tar_sparse.terminate()
except:
pass
try:
hmac.terminate()
except:
pass
tar_sparse.wait()
hmac.wait()
to_send.put("ERROR")
send_proc.join()
shutil.rmtree(backup_tmpdir)
running_backup_operation = None
raise BackupCanceledError("Backup canceled")
if run_error and run_error != "size_limit":
send_proc.terminate()
if run_error == "VM" and vmproc:
raise QubesException("Failed to write the backup, VM output:\n" +
vmproc.stderr.read(MAX_STDERR_BYTES))
else:
raise QubesException("Failed to perform backup: error in "+ \
run_error)
# Send the chunk to the backup target
to_send.put(os.path.relpath(chunkfile, backup_tmpdir))
# Close HMAC
hmac.stdin.close()
hmac.wait()
if BACKUP_DEBUG:
print "HMAC proc return code:", hmac.poll()
# Write HMAC data next to the chunk file
hmac_data = hmac.stdout.read()
if BACKUP_DEBUG:
print "Writing hmac to", chunkfile+".hmac"
hmac_file = open(chunkfile+".hmac",'w')
hmac_file.write(hmac_data)
hmac_file.flush()
hmac_file.close()
# Send the HMAC to the backup target
to_send.put(os.path.relpath(chunkfile, backup_tmpdir)+".hmac")
if tar_sparse.poll() is None or run_error == "size_limit":
run_error="paused"
else:
running_backup_operation.processes_to_kill_on_cancel.remove(
tar_sparse)
if BACKUP_DEBUG:
print "Finished tar sparse with exit code", tar_sparse\
.poll()
pipe.close()
to_send.put("FINISHED")
send_proc.join()
shutil.rmtree(backup_tmpdir)
if running_backup_operation.canceled:
running_backup_operation = None
raise BackupCanceledError("Backup canceled")
running_backup_operation = None
if send_proc.exitcode != 0:
raise QubesException("Failed to send backup: error in the sending process")
if vmproc:
if BACKUP_DEBUG:
print "VMProc1 proc return code:", vmproc.poll()
print "Sparse1 proc return code:", tar_sparse.poll()
vmproc.stdin.close()
# Save date of last backup
qvm_collection = QubesVmCollection()
qvm_collection.lock_db_for_writing()
qvm_collection.load()
for vm in qvm_collection.values():
if vm.backup_content:
vm.backup_timestamp = datetime.datetime.now()
qvm_collection.save()
qvm_collection.unlock_db()
'''
' Wait for backup chunk to finish
' - Monitor all the processes (streamproc, hmac, vmproc, addproc) for errors
' - Copy stdout of streamproc to backup_target and hmac stdin if available
' - Compute progress based on total_backup_sz and send progress to
' progress_callback function
' - Returns if
' - one of the monitored processes error out (streamproc, hmac, vmproc,
' addproc), along with the processe that failed
' - all of the monitored processes except vmproc finished successfully
' (vmproc termination is controlled by the python script)
' - streamproc does not delivers any data anymore (return with the error
' "")
' - size_limit is provided and is about to be exceeded
'''
def wait_backup_feedback(progress_callback, in_stream, streamproc,
backup_target, total_backup_sz, hmac=None, vmproc=None, addproc=None,
remove_trailing_bytes=0, size_limit=None):
buffer_size = 409600
run_error = None
run_count = 1
bytes_copied = 0
while run_count > 0 and run_error == None:
if size_limit and bytes_copied + buffer_size > size_limit:
return "size_limit"
buffer = in_stream.read(buffer_size)
progress_callback(len(buffer), total_backup_sz)
bytes_copied += len(buffer)
run_count = 0
if hmac:
retcode=hmac.poll()
if retcode != None:
if retcode != 0:
run_error = "hmac"
else:
run_count += 1
if addproc:
retcode=addproc.poll()
if retcode != None:
if retcode != 0:
run_error = "addproc"
else:
run_count += 1
if vmproc:
retcode = vmproc.poll()
if retcode != None:
if retcode != 0:
run_error = "VM"
if BACKUP_DEBUG:
print vmproc.stdout.read()
else:
# VM should run until the end
pass
if streamproc:
retcode=streamproc.poll()
if retcode != None:
if retcode != 0:
run_error = "streamproc"
break
elif retcode == 0 and len(buffer) <= 0:
return ""
run_count += 1
else:
if len(buffer) <= 0:
return ""
try:
backup_target.write(buffer)
except IOError as e:
if e.errno == errno.EPIPE:
run_error = "target"
else:
raise
if hmac:
hmac.stdin.write(buffer)
return run_error
def verify_hmac(filename, hmacfile, passphrase, algorithm):
if BACKUP_DEBUG:
print "Verifying file "+filename
if hmacfile != filename + ".hmac":
raise QubesException(
"ERROR: expected hmac for {}, but got {}".\
format(filename, hmacfile))
hmac_proc = subprocess.Popen (["openssl", "dgst", "-" + algorithm,
"-hmac", passphrase],
stdin=open(filename,'rb'),
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
hmac_stdout, hmac_stderr = hmac_proc.communicate()
if len(hmac_stderr) > 0:
raise QubesException("ERROR: verify file {0}: {1}".format(filename, hmac_stderr))
else:
if BACKUP_DEBUG:
print "Loading hmac for file " + filename
hmac = load_hmac(open(hmacfile,'r').read())
if len(hmac) > 0 and load_hmac(hmac_stdout) == hmac:
os.unlink(hmacfile)
if BACKUP_DEBUG:
print "File verification OK -> Sending file " + filename
return True
else:
raise QubesException(
"ERROR: invalid hmac for file {0}: {1}. " \
"Is the passphrase correct?".\
format(filename, load_hmac(hmac_stdout)))
# Not reachable
return False
class ExtractWorker2(Process):
def __init__(self, queue, base_dir, passphrase, encrypted, total_size,
print_callback, error_callback, progress_callback, vmproc=None,
compressed = False, crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM,
verify_only=False):
super(ExtractWorker2, self).__init__()
self.queue = queue
self.base_dir = base_dir
self.passphrase = passphrase
self.encrypted = encrypted
self.compressed = compressed
self.crypto_algorithm = crypto_algorithm
self.verify_only = verify_only
self.total_size = total_size
self.blocks_backedup = 0
self.tar2_process = None
self.tar2_current_file = None
self.decompressor_process = None
self.decryptor_process = None
self.print_callback = print_callback
self.error_callback = error_callback
self.progress_callback = progress_callback
self.vmproc = vmproc
self.restore_pipe = os.path.join(self.base_dir,"restore_pipe")
if BACKUP_DEBUG:
print "Creating pipe in:", self.restore_pipe
os.mkfifo(self.restore_pipe)
self.stderr_encoding = sys.stderr.encoding or 'utf-8'
def compute_progress(self, new_size, total_size):
if self.progress_callback:
self.blocks_backedup += new_size
progress = self.blocks_backedup / float(self.total_size)
progress = int(round(progress*100,2))
self.progress_callback(progress)
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)
if not BACKUP_DEBUG:
msg_re = re.compile(r".*#[0-9].*restore_pipe")
new_lines = filter(lambda x: not msg_re.match(x), new_lines)
self.tar2_stderr += new_lines
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:
# FIXME: kill()?
try:
process.terminate()
except OSError:
pass
process.wait()
self.error_callback("ERROR: " + unicode(e))
raise e, None, exc_traceback
def __run__(self):
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Started sending thread")
self.print_callback("Moving to dir "+self.base_dir)
os.chdir(self.base_dir)
filename = None
for filename in iter(self.queue.get, None):
if filename == "FINISHED" or filename == "ERROR":
break
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Extracting file "+filename)
if filename.endswith('.000'):
# next file
if self.tar2_process != None:
if self.tar2_process.wait() != 0:
self.collect_tar_output()
self.error_callback(
"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.tar2_process = None
self.tar2_current_file = None
tar2_cmdline = ['tar',
'-%sMk%sf' % ("t" if self.verify_only else "x",
"v" if BACKUP_DEBUG else ""),
self.restore_pipe,
os.path.relpath(filename.rstrip('.000'))]
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Running command "+
unicode(tar2_cmdline))
self.tar2_process = subprocess.Popen(tar2_cmdline,
stdin=subprocess.PIPE,
stderr=subprocess.PIPE)
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
if not BACKUP_DEBUG:
os.remove(filename)
continue
else:
self.collect_tar_output()
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("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')
common_args = {
'backup_target': pipe,
'total_backup_sz': self.total_size,
'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)
run_error = wait_backup_feedback(
progress_callback=self.compute_progress,
in_stream=self.decryptor_process.stdout,
streamproc=self.decryptor_process,
**common_args)
elif self.compressed:
self.decompressor_process = subprocess.Popen (["gzip", "-d"],
stdin=open(filename,'rb'),
stdout=subprocess.PIPE)
run_error = wait_backup_feedback(
progress_callback=self.compute_progress,
in_stream=self.decompressor_process.stdout,
streamproc=self.decompressor_process,
**common_args)
else:
run_error = wait_backup_feedback(
progress_callback=self.compute_progress,
in_stream=open(filename,"rb"), streamproc=None,
**common_args)
try:
pipe.close()
except IOError as e:
if e.errno == errno.EPIPE:
if BACKUP_DEBUG:
self.error_callback("Got EPIPE while closing pipe to the inner tar process")
# ignore the error
else:
raise
if len(run_error):
if run_error == "target":
self.collect_tar_output()
details = "\n".join(self.tar2_stderr)
else:
details = "%s failed" % run_error
self.tar2_process.terminate()
self.tar2_process.wait()
self.tar2_process = None
self.error_callback("Error while processing '%s': %s " % \
(self.tar2_current_file, details))
# Delete the file as we don't need it anymore
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Removing file "+filename)
os.remove(filename)
os.unlink(self.restore_pipe)
if self.tar2_process is not None:
if filename == "ERROR":
self.tar2_process.terminate()
self.tar2_process.wait()
elif self.tar2_process.wait() != 0:
self.collect_tar_output()
raise QubesException(
"unable to extract files for {0}.{1} Tar command "
"output: %s".
format(self.tar2_current_file,
(" Perhaps the backup is encrypted?"
if not self.encrypted else "",
"\n".join(self.tar2_stderr))))
else:
# Finished extracting the tar file
self.tar2_process = None
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Finished extracting thread")
class ExtractWorker3(ExtractWorker2):
def __init__(self, queue, base_dir, passphrase, encrypted, total_size,
print_callback, error_callback, progress_callback, vmproc=None,
compressed=False, crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM,
compression_filter = None, verify_only=False):
super(ExtractWorker3, self).__init__(queue, base_dir, passphrase,
encrypted, total_size,
print_callback, error_callback,
progress_callback, vmproc,
compressed, crypto_algorithm,
verify_only)
self.compression_filter = compression_filter
os.unlink(self.restore_pipe)
def __run__(self):
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Started sending thread")
self.print_callback("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 == "FINISHED" or filename == "ERROR":
break
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Extracting file "+filename)
if filename.endswith('.000'):
# next file
if self.tar2_process != None:
input_pipe.close()
if self.tar2_process.wait() != 0:
self.collect_tar_output()
self.error_callback(
"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.tar2_process = None
self.tar2_current_file = None
tar2_cmdline = ['tar',
'-%sk%s' % ("t" if self.verify_only else "x",
"v" if BACKUP_DEBUG else ""),
os.path.relpath(filename.rstrip('.000'))]
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)
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Running command "+
unicode(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,
stderr=subprocess.PIPE)
input_pipe = self.decryptor_process.stdin
else:
self.tar2_process = subprocess.Popen(tar2_cmdline,
stdin=subprocess.PIPE,
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
if not BACKUP_DEBUG:
os.remove(filename)
continue
else:
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Releasing next chunck")
self.tar2_current_file = filename
common_args = {
'backup_target': input_pipe,
'total_backup_sz': self.total_size,
'hmac': None,
'vmproc': self.vmproc,
'addproc': self.tar2_process
}
run_error = wait_backup_feedback(
progress_callback=self.compute_progress,
in_stream=open(filename,"rb"), streamproc=None,
**common_args)
if len(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.tar2_process.terminate()
self.tar2_process.wait()
self.tar2_process = None
self.error_callback("Error while processing '%s': %s " % \
(self.tar2_current_file, details))
# Delete the file as we don't need it anymore
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Removing file "+filename)
os.remove(filename)
if self.tar2_process is not None:
input_pipe.close()
if filename == "ERROR":
if self.decryptor_process:
self.decryptor_process.terminate()
self.decryptor_process.wait()
self.decryptor_process = None
self.tar2_process.terminate()
self.tar2_process.wait()
elif self.tar2_process.wait() != 0:
self.collect_tar_output()
raise QubesException(
"unable to extract files for {0}.{1} Tar command "
"output: %s".
format(self.tar2_current_file,
(" Perhaps the backup is encrypted?"
if not self.encrypted else "",
"\n".join(self.tar2_stderr))))
else:
# Finished extracting the tar file
self.tar2_process = None
if BACKUP_DEBUG and callable(self.print_callback):
self.print_callback("Finished extracting thread")
def get_supported_hmac_algo(hmac_algorithm):
# 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()
def parse_backup_header(filename):
header_data = {}
with open(filename, 'r') as f:
for line in f.readlines():
if line.count('=') != 1:
raise QubesException("Invalid backup header (line %s)" % line)
(key, value) = line.strip().split('=')
if not any([key == getattr(BackupHeader, attr) for attr in dir(
BackupHeader)]):
# Ignoring unknown option
continue
if key in BackupHeader.bool_options:
value = value.lower() in ["1", "true", "yes"]
elif key in BackupHeader.int_options:
value = int(value)
header_data[key] = value
return header_data
def restore_vm_dirs (backup_source, restore_tmpdir, passphrase, vms_dirs, vms,
vms_size, print_callback=None, error_callback=None,
progress_callback=None, encrypted=False, appvm=None,
compressed = False, hmac_algorithm=DEFAULT_HMAC_ALGORITHM,
crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM,
verify_only=False, format_version = CURRENT_BACKUP_FORMAT_VERSION,
compression_filter = None):
global running_backup_operation
if callable(print_callback):
if BACKUP_DEBUG:
print_callback("Working in temporary dir:"+restore_tmpdir)
print_callback("Extracting data: " + size_to_human(vms_size)+" to restore")
passphrase = passphrase.encode('utf-8')
header_data = None
vmproc = None
if appvm != None:
# Prepare the backup target (Qubes service call)
backup_target = "QUBESRPC qubes.Restore dom0"
# If APPVM, STDOUT is a PIPE
vmproc = appvm.run(command = backup_target, passio_popen = True, passio_stderr=True)
vmproc.stdin.write(backup_source.replace("\r","").replace("\n","")+"\n")
# Send to tar2qfile the VMs that should be extracted
vmproc.stdin.write(" ".join(vms_dirs)+"\n")
if running_backup_operation:
running_backup_operation.processes_to_kill_on_cancel.append(vmproc)
backup_stdin = vmproc.stdout
tar1_command = ['/usr/libexec/qubes/qfile-dom0-unpacker',
str(os.getuid()), restore_tmpdir, '-v']
else:
backup_stdin = open(backup_source,'rb')
tar1_command = ['tar',
'-ixvf', backup_source,
'-C', restore_tmpdir] + vms_dirs
tar1_env = os.environ.copy()
# TODO: add some safety margin?
tar1_env['UPDATES_MAX_BYTES'] = str(vms_size)
# Restoring only header
if vms_dirs and vms_dirs[0] == HEADER_FILENAME:
# backup-header, backup-header.hmac, qubes-xml.000, qubes-xml.000.hmac
tar1_env['UPDATES_MAX_FILES'] = '4'
else:
# 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)
tar1_env['UPDATES_MAX_FILES'] = str(2*(10*len(vms_dirs) +
int(vms_size/(100*1024*1024))))
if BACKUP_DEBUG and callable(print_callback):
print_callback("Run command"+unicode(tar1_command))
command = subprocess.Popen(tar1_command,
stdin=backup_stdin,
stdout=vmproc.stdin if vmproc else subprocess.PIPE,
stderr=subprocess.PIPE,
env=tar1_env)
if running_backup_operation:
running_backup_operation.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 appvm:
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
expect_tar_error = False
to_extract = Queue()
nextfile = None
# If want to analyze backup header, do it now
if vms_dirs and vms_dirs[0] == HEADER_FILENAME:
filename = filelist_pipe.readline().strip()
hmacfile = filelist_pipe.readline().strip()
if not appvm:
nextfile = filelist_pipe.readline().strip()
if BACKUP_DEBUG and callable(print_callback):
print_callback("Got backup header and hmac: %s, %s" % (filename,
hmacfile))
if not filename or filename=="EOF" or \
not hmacfile or hmacfile == "EOF":
if appvm:
vmproc.wait()
proc_error_msg = vmproc.stderr.read(MAX_STDERR_BYTES)
else:
command.wait()
proc_error_msg = command.stderr.read(MAX_STDERR_BYTES)
raise QubesException("Premature end of archive while receiving "
"backup header. Process output:\n" +
proc_error_msg)
filename = os.path.join(restore_tmpdir, filename)
hmacfile = os.path.join(restore_tmpdir, hmacfile)
file_ok = False
for hmac_algo in get_supported_hmac_algo(hmac_algorithm):
try:
if verify_hmac(filename, hmacfile, passphrase, hmac_algo):
file_ok = True
hmac_algorithm = hmac_algo
break
except QubesException:
# Ignore exception here, try the next algo
pass
if not file_ok:
raise QubesException("Corrupted backup header (hmac verification "
"failed). Is the password correct?")
if os.path.basename(filename) == HEADER_FILENAME:
header_data = parse_backup_header(filename)
if BackupHeader.version in header_data:
format_version = header_data[BackupHeader.version]
if BackupHeader.crypto_algorithm in header_data:
crypto_algorithm = header_data[BackupHeader.crypto_algorithm]
if BackupHeader.hmac_algorithm in header_data:
hmac_algorithm = header_data[BackupHeader.hmac_algorithm]
if BackupHeader.compressed in header_data:
compressed = header_data[BackupHeader.compressed]
if BackupHeader.encrypted in header_data:
encrypted = header_data[BackupHeader.encrypted]
if BackupHeader.compression_filter in header_data:
compression_filter = header_data[BackupHeader.compression_filter]
os.unlink(filename)
else:
# if no header found, create one with guessed HMAC algo
header_data = { BackupHeader.hmac_algorithm: hmac_algorithm }
# If this isn't backup header, pass it to ExtractWorker
to_extract.put(filename)
# 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 appvm:
expect_tar_error = True
# 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': to_extract,
'base_dir': restore_tmpdir,
'passphrase': passphrase,
'encrypted': encrypted,
'compressed': compressed,
'crypto_algorithm': crypto_algorithm,
'verify_only': verify_only,
'total_size': vms_size,
'print_callback': print_callback,
'error_callback': error_callback,
'progress_callback': progress_callback,
}
if format_version == 2:
extract_proc = ExtractWorker2(**extractor_params)
elif format_version == 3:
extractor_params['compression_filter'] = compression_filter
extract_proc = ExtractWorker3(**extractor_params)
else:
raise NotImplemented("Backup format version %d not supported" % format_version)
extract_proc.start()
try:
filename = None
while True:
if running_backup_operation and running_backup_operation.canceled:
break
if not extract_proc.is_alive():
command.terminate()
command.wait()
expect_tar_error = True
if vmproc:
vmproc.terminate()
vmproc.wait()
vmproc = None
break
if nextfile is not None:
filename = nextfile
else:
filename = filelist_pipe.readline().strip()
if BACKUP_DEBUG and callable(print_callback):
print_callback("Getting new file:"+filename)
if not filename or filename=="EOF":
break
hmacfile = filelist_pipe.readline().strip()
if running_backup_operation and running_backup_operation.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 appvm:
nextfile = filelist_pipe.readline().strip()
if BACKUP_DEBUG and callable(print_callback):
print_callback("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)):
if BACKUP_DEBUG and callable(print_callback):
print_callback("Ignoring VM not selected for restore")
os.unlink(os.path.join(restore_tmpdir, filename))
os.unlink(os.path.join(restore_tmpdir, hmacfile))
continue
if verify_hmac(os.path.join(restore_tmpdir,filename),
os.path.join(restore_tmpdir,hmacfile),
passphrase, hmac_algorithm):
to_extract.put(os.path.join(restore_tmpdir, filename))
if running_backup_operation and running_backup_operation.canceled:
raise BackupCanceledError("Restore canceled",
tmpdir=restore_tmpdir)
if command.wait() != 0 and not expect_tar_error:
raise QubesException(
"unable to read the qubes backup file {0} ({1}). " \
"Is it really a backup?".format(backup_source, command.wait()))
if vmproc:
if vmproc.wait() != 0:
raise QubesException(
"unable to read the qubes backup {0} " \
"because of a VM error: {1}".format(
backup_source, vmproc.stderr.read(MAX_STDERR_BYTES)))
if filename and filename!="EOF":
raise QubesException("Premature end of archive, the last file was %s" % filename)
except:
to_extract.put("ERROR")
extract_proc.join()
raise
else:
to_extract.put("FINISHED")
if BACKUP_DEBUG and callable(print_callback):
print_callback("Waiting for the extraction process to finish...")
extract_proc.join()
if BACKUP_DEBUG and callable(print_callback):
print_callback("Extraction process finished with code:" + \
str(extract_proc.exitcode))
if extract_proc.exitcode != 0:
raise QubesException(
"unable to extract the qubes backup. " \
"Check extracting process errors.")
return header_data
def backup_restore_set_defaults(options):
if 'use-default-netvm' not in options:
options['use-default-netvm'] = False
if 'use-none-netvm' not in options:
options['use-none-netvm'] = False
if 'use-default-template' not in options:
options['use-default-template'] = False
if 'dom0-home' not in options:
options['dom0-home'] = True
if 'replace-template' not in options:
options['replace-template'] = []
if 'ignore-username-mismatch' not in options:
options['ignore-username-mismatch'] = False
if 'verify-only' not in options:
options['verify-only'] = False
return options
def load_hmac(hmac):
hmac = hmac.strip().split("=")
if len(hmac) > 1:
hmac = hmac[1].strip()
else:
raise QubesException("ERROR: invalid hmac file content")
return hmac
def backup_detect_format_version(backup_location):
if os.path.exists(os.path.join(backup_location, 'qubes.xml')):
return 1
else:
# this could mean also 3, but not distinguishable until backup header
# is read
return 2
def backup_restore_header(source, passphrase,
print_callback = print_stdout, error_callback = print_stderr,
encrypted=False, appvm=None, compressed = False, format_version = None,
hmac_algorithm = DEFAULT_HMAC_ALGORITHM,
crypto_algorithm = DEFAULT_CRYPTO_ALGORITHM):
global running_backup_operation
vmproc = None
running_backup_operation = None
restore_tmpdir = tempfile.mkdtemp(prefix="/var/tmp/restore_")
if format_version == None:
format_version = backup_detect_format_version(source)
if format_version == 1:
return (restore_tmpdir, os.path.join(source, 'qubes.xml'), None)
# tar2qfile matches only beginnings, while tar full path
if appvm:
extract_filter = [HEADER_FILENAME, 'qubes.xml.000']
else:
extract_filter = [HEADER_FILENAME, HEADER_FILENAME+'.hmac',
'qubes.xml.000', 'qubes.xml.000.hmac']
header_data = restore_vm_dirs (source,
restore_tmpdir,
passphrase=passphrase,
vms_dirs=extract_filter,
vms=None,
vms_size=HEADER_QUBES_XML_MAX_SIZE,
format_version=format_version,
hmac_algorithm=hmac_algorithm,
crypto_algorithm=crypto_algorithm,
print_callback=print_callback,
error_callback=error_callback,
progress_callback=None,
encrypted=encrypted,
compressed=compressed,
appvm=appvm)
return (restore_tmpdir, os.path.join(restore_tmpdir, "qubes.xml"),
header_data)
def restore_info_verify(restore_info, host_collection):
options = restore_info['$OPTIONS$']
for vm in restore_info.keys():
if vm in ['$OPTIONS$', 'dom0']:
continue
vm_info = restore_info[vm]
vm_info.pop('excluded', None)
if 'exclude' in options.keys():
if vm in options['exclude']:
vm_info['excluded'] = True
vm_info.pop('already-exists', None)
if not options['verify-only'] and \
host_collection.get_vm_by_name (vm) is not None:
vm_info['already-exists'] = True
# check template
vm_info.pop('missing-template', None)
if vm_info['template']:
template_name = vm_info['template']
host_template = host_collection.get_vm_by_name(template_name)
if not host_template or not host_template.is_template():
# Maybe the (custom) template is in the backup?
if not (template_name in restore_info.keys() and
restore_info[template_name]['vm'].is_template()):
if options['use-default-template']:
if 'orig-template' not in vm_info.keys():
vm_info['orig-template'] = template_name
vm_info['template'] = host_collection\
.get_default_template().name
else:
vm_info['missing-template'] = True
# check netvm
vm_info.pop('missing-netvm', None)
if vm_info['netvm']:
netvm_name = vm_info['netvm']
netvm_on_host = host_collection.get_vm_by_name (netvm_name)
# No netvm on the host?
if not ((netvm_on_host is not None) and netvm_on_host.is_netvm()):
# Maybe the (custom) netvm is in the backup?
if not (netvm_name in restore_info.keys() and \
restore_info[netvm_name]['vm'].is_netvm()):
if options['use-default-netvm']:
vm_info['netvm'] = host_collection\
.get_default_netvm().name
vm_info['vm'].uses_default_netvm = True
elif options['use-none-netvm']:
vm_info['netvm'] = None
else:
vm_info['missing-netvm'] = True
vm_info['good-to-go'] = not any([(prop in vm_info.keys()) for
prop in ['missing-netvm',
'missing-template',
'already-exists',
'excluded']])
return restore_info
def backup_restore_prepare(backup_location, passphrase, options = None,
host_collection = None, encrypted=False, appvm=None,
compressed = False, print_callback = print_stdout, error_callback = print_stderr,
format_version=None, hmac_algorithm=DEFAULT_HMAC_ALGORITHM,
crypto_algorithm=DEFAULT_CRYPTO_ALGORITHM):
if options is None:
options = {}
# Defaults
backup_restore_set_defaults(options)
# Options introduced in backup format 3+, which always have a header,
# so no need for fallback in function parameter
compression_filter = DEFAULT_COMPRESSION_FILTER
#### Private functions begin
def is_vm_included_in_backup_v1 (backup_dir, vm):
if vm.qid == 0:
return os.path.exists(os.path.join(backup_dir,'dom0-home'))
backup_vm_dir_path = vm.dir_path.replace (system_path["qubes_base_dir"], backup_dir)
if os.path.exists (backup_vm_dir_path):
return True
else:
return False
def is_vm_included_in_backup_v2 (backup_dir, vm):
if vm.backup_content:
return True
else:
return False
def find_template_name(template, replaces):
rx_replace = re.compile("(.*):(.*)")
for r in replaces:
m = rx_replace.match(r)
if m.group(1) == template:
return m.group(2)
return template
#### Private functions end
# Format versions:
# 1 - Qubes R1, Qubes R2 beta1, beta2
# 2 - Qubes R2 beta3+
if format_version is None:
format_version = backup_detect_format_version(backup_location)
if format_version == 1:
is_vm_included_in_backup = is_vm_included_in_backup_v1
elif format_version in [2, 3]:
is_vm_included_in_backup = is_vm_included_in_backup_v2
if not appvm:
if not os.path.isfile(backup_location):
raise QubesException("Invalid backup location (not a file or "
"directory with qubes.xml)"
": %s" % unicode(
backup_location))
else:
raise QubesException("Unknown backup format version: %s" % str(format_version))
(restore_tmpdir, qubes_xml, header_data) = backup_restore_header(
backup_location,
passphrase,
encrypted=encrypted,
appvm=appvm,
compressed=compressed,
hmac_algorithm=hmac_algorithm,
crypto_algorithm=crypto_algorithm,
print_callback=print_callback,
error_callback=error_callback,
format_version=format_version)
if header_data:
if BackupHeader.version in header_data:
format_version = header_data[BackupHeader.version]
if BackupHeader.crypto_algorithm in header_data:
crypto_algorithm = header_data[BackupHeader.crypto_algorithm]
if BackupHeader.hmac_algorithm in header_data:
hmac_algorithm = header_data[BackupHeader.hmac_algorithm]
if BackupHeader.compressed in header_data:
compressed = header_data[BackupHeader.compressed]
if BackupHeader.encrypted in header_data:
encrypted = header_data[BackupHeader.encrypted]
if BackupHeader.compression_filter in header_data:
compression_filter = header_data[BackupHeader.compression_filter]
if BACKUP_DEBUG:
print "Loading file", qubes_xml
backup_collection = QubesVmCollection(store_filename = qubes_xml)
backup_collection.lock_db_for_reading()
backup_collection.load()
if host_collection is None:
host_collection = QubesVmCollection()
host_collection.lock_db_for_reading()
host_collection.load()
host_collection.unlock_db()
backup_vms_list = [vm for vm in backup_collection.values()]
vms_to_restore = {}
# ... and the actual data
for vm in backup_vms_list:
if vm.qid == 0:
# Handle dom0 as special case later
continue
if is_vm_included_in_backup (backup_location, vm):
if BACKUP_DEBUG:
print vm.name,"is included in backup"
vms_to_restore[vm.name] = {}
vms_to_restore[vm.name]['vm'] = vm
if vm.template is None:
vms_to_restore[vm.name]['template'] = None
else:
templatevm_name = find_template_name(vm.template.name, options['replace-template'])
vms_to_restore[vm.name]['template'] = templatevm_name
if vm.netvm is None:
vms_to_restore[vm.name]['netvm'] = None
else:
netvm_name = vm.netvm.name
vms_to_restore[vm.name]['netvm'] = netvm_name
# Set to None to not confuse QubesVm object from backup
# collection with host collection (further in clone_attrs). Set
# directly _netvm to suppress setter action, especially
# modifying firewall
vm._netvm = None
# Store restore parameters
options['location'] = backup_location
options['restore_tmpdir'] = restore_tmpdir
options['passphrase'] = passphrase
options['encrypted'] = encrypted
options['compressed'] = compressed
options['compression_filter'] = compression_filter
options['hmac_algorithm'] = hmac_algorithm
options['crypto_algorithm'] = crypto_algorithm
options['appvm'] = appvm
options['format_version'] = format_version
vms_to_restore['$OPTIONS$'] = options
vms_to_restore = restore_info_verify(vms_to_restore, host_collection)
# ...and dom0 home
if options['dom0-home'] and \
is_vm_included_in_backup(backup_location, backup_collection[0]):
vm = backup_collection[0]
vms_to_restore['dom0'] = {}
if format_version == 1:
vms_to_restore['dom0']['subdir'] = \
os.listdir(os.path.join(backup_location, 'dom0-home'))[0]
vms_to_restore['dom0']['size'] = 0 # unknown
else:
vms_to_restore['dom0']['subdir'] = vm.backup_path
vms_to_restore['dom0']['size'] = vm.backup_size
local_user = grp.getgrnam('qubes').gr_mem[0]
dom0_home = vms_to_restore['dom0']['subdir']
vms_to_restore['dom0']['username'] = os.path.basename(dom0_home)
if vms_to_restore['dom0']['username'] != local_user:
vms_to_restore['dom0']['username-mismatch'] = True
if options['ignore-username-mismatch']:
vms_to_restore['dom0']['ignore-username-mismatch'] = True
else:
vms_to_restore['dom0']['good-to-go'] = False
if 'good-to-go' not in vms_to_restore['dom0']:
vms_to_restore['dom0']['good-to-go'] = True
# Not needed - all the data stored in vms_to_restore
if format_version >= 2:
os.unlink(qubes_xml)
return vms_to_restore
def backup_restore_print_summary(restore_info, print_callback = print_stdout):
fields = {
"qid": {"func": "vm.qid"},
"name": {"func": "('[' if vm.is_template() else '')\
+ ('{' if vm.is_netvm() else '')\
+ vm.name \
+ (']' if vm.is_template() else '')\
+ ('}' if vm.is_netvm() else '')"},
"type": {"func": "'Tpl' if vm.is_template() else \
'HVM' if vm.type == 'HVM' else \
vm.type.replace('VM','')"},
"updbl" : {"func": "'Yes' if vm.updateable else ''"},
"template": {"func": "'n/a' if vm.is_template() or vm.template is None else\
vm_info['template']"},
"netvm": {"func": "'n/a' if vm.is_netvm() and not vm.is_proxyvm() else\
('*' if vm.uses_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' in vm_info.keys():
vm = vm_info['vm']
l = len(unicode(eval(fields[f]["func"])))
if l > fields[f]["max_width"]:
fields[f]["max_width"] = l
total_width += fields[f]["max_width"]
print_callback("")
print_callback("The following VMs are included in the backup:")
print_callback("")
# Display the header
s = ""
for f in fields_to_display:
fmt="{{0:-^{0}}}-+".format(fields[f]["max_width"] + 1)
s += fmt.format('-')
print_callback(s)
s = ""
for f in fields_to_display:
fmt="{{0:>{0}}} |".format(fields[f]["max_width"] + 1)
s += fmt.format(f)
print_callback(s)
s = ""
for f in fields_to_display:
fmt="{{0:-^{0}}}-+".format(fields[f]["max_width"] + 1)
s += fmt.format('-')
print_callback(s)
for vm_info in restore_info.values():
# Skip non-VM here
if not 'vm' in vm_info:
continue
vm = vm_info['vm']
s = ""
for f in fields_to_display:
fmt="{{0:>{0}}} |".format(fields[f]["max_width"] + 1)
s += fmt.format(eval(fields[f]["func"]))
if 'excluded' in vm_info and vm_info['excluded']:
s += " <-- Excluded from restore"
elif 'already-exists' in vm_info:
s += " <-- A VM with the same name already exists on the host!"
elif 'missing-template' in vm_info:
s += " <-- No matching template on the host or in the backup found!"
elif 'missing-netvm' in vm_info:
s += " <-- No matching netvm on the host or in the backup found!"
elif 'orig-template' in vm_info:
s += " <-- Original template was '%s'" % (vm_info['orig-template'])
print_callback(s)
if 'dom0' in restore_info.keys():
s = ""
for f in fields_to_display:
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 'username-mismatch' in restore_info['dom0']:
s += " <-- username in backup and dom0 mismatch"
if 'ignore-username-mismatch' in restore_info['dom0']:
s += " (ignored)"
print_callback(s)
def backup_restore_do(restore_info,
host_collection = None, print_callback = print_stdout,
error_callback = print_stderr, progress_callback = None,
):
global running_backup_operation
### Private functions begin
def restore_vm_dir_v1 (backup_dir, src_dir, dst_dir):
backup_src_dir = src_dir.replace (system_path["qubes_base_dir"], backup_dir)
# We prefer to use Linux's cp, because it nicely handles sparse files
retcode = subprocess.call (["cp", "-rp", backup_src_dir, dst_dir])
if retcode != 0:
raise QubesException(
"*** Error while copying file {0} to {1}".format(backup_src_dir,
dst_dir))
### Private functions end
options = restore_info['$OPTIONS$']
backup_location = options['location']
restore_tmpdir = options['restore_tmpdir']
passphrase = options['passphrase']
encrypted = options['encrypted']
compressed = options['compressed']
compression_filter = options['compression_filter']
hmac_algorithm = options['hmac_algorithm']
crypto_algorithm = options['crypto_algorithm']
verify_only = options['verify-only']
appvm = options['appvm']
format_version = options['format_version']
if format_version is None:
format_version = backup_detect_format_version(backup_location)
lock_obtained = False
if host_collection is None:
host_collection = QubesVmCollection()
host_collection.lock_db_for_writing()
host_collection.load()
lock_obtained = True
# Perform VM restoration in backup order
vms_dirs = []
vms_size = 0
vms = {}
for vm_info in restore_info.values():
if 'vm' not in vm_info:
continue
if not vm_info['good-to-go']:
continue
vm = vm_info['vm']
if format_version >= 2:
vms_size += vm.backup_size
vms_dirs.append(vm.backup_path)
vms[vm.name] = vm
running_backup_operation = BackupOperationInfo()
if format_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:
restore_vm_dirs (backup_location,
restore_tmpdir,
passphrase=passphrase,
vms_dirs=vms_dirs,
vms=vms,
vms_size=vms_size,
format_version=format_version,
hmac_algorithm=hmac_algorithm,
crypto_algorithm=crypto_algorithm,
verify_only=verify_only,
print_callback=print_callback,
error_callback=error_callback,
progress_callback=progress_callback,
encrypted=encrypted,
compressed=compressed,
compression_filter=compression_filter,
appvm=appvm)
except QubesException as e:
if verify_only:
raise
else:
if callable(print_callback):
print_callback("Some errors occurred during data extraction, "
"continuing anyway to restore at least some "
"VMs")
else:
if verify_only:
if callable(print_callback):
print_callback("WARNING: Backup verification not supported for "
"this backup format.")
if verify_only:
shutil.rmtree(restore_tmpdir)
return
# Add VM in right order
for (vm_class_name, vm_class) in sorted(QubesVmClasses.items(),
key=lambda _x: _x[1].load_order):
if running_backup_operation.canceled:
break
for vm in vms.values():
if running_backup_operation.canceled:
# only break the loop to save qubes.xml with already restored
# VMs
break
if not vm.__class__ == vm_class:
continue
if callable(print_callback):
print_callback("-> Restoring {type} {0}...".format(vm.name, type=vm_class_name))
retcode = subprocess.call (["mkdir", "-p", os.path.dirname(vm.dir_path)])
if retcode != 0:
error_callback("*** Cannot create directory: {0}?!".format(
vm.dir_path))
error_callback("Skipping...")
continue
template = None
if vm.template is not None:
template_name = restore_info[vm.name]['template']
template = host_collection.get_vm_by_name(template_name)
new_vm = None
try:
new_vm = host_collection.add_new_vm(vm_class_name, name=vm.name,
conf_file=vm.conf_file,
dir_path=vm.dir_path,
template=template,
installed_by_rpm=False)
if format_version == 1:
restore_vm_dir_v1(backup_location,
vm.dir_path,
os.path.dirname(new_vm.dir_path))
elif format_version >= 2:
shutil.move(os.path.join(restore_tmpdir, vm.backup_path),
new_vm.dir_path)
new_vm.verify_files()
except Exception as err:
error_callback("ERROR: {0}".format(err))
error_callback("*** Skipping VM: {0}".format(vm.name))
if new_vm:
host_collection.pop(new_vm.qid)
continue
# FIXME: cannot check for 'kernel' property, because it is always
# defined - accessing it touches non-existent '_kernel'
if not isinstance(vm, QubesVmClasses['QubesHVm']):
# TODO: add a setting for this?
if vm.kernel and vm.kernel not in os.listdir(system_path[
'qubes_kernels_base_dir']):
if callable(print_callback):
print_callback("WARNING: Kernel %s not installed, "
"using default one" % vm.kernel)
vm.uses_default_kernel = True
vm.kernel = host_collection.get_default_kernel()
try:
new_vm.clone_attrs(vm)
except Exception as err:
error_callback("ERROR: {0}".format(err))
error_callback("*** Some VM property will not be restored")
try:
new_vm.appmenus_create(verbose=callable(print_callback))
except Exception as err:
error_callback("ERROR during appmenu restore: {0}".format(err))
error_callback("*** VM '{0}' will not have appmenus".format(vm.name))
# Set network dependencies - only non-default netvm setting
for vm in vms.values():
host_vm = host_collection.get_vm_by_name(vm.name)
if host_vm is None:
# Failed/skipped VM
continue
if not vm.uses_default_netvm:
if restore_info[vm.name]['netvm'] is not None:
host_vm.netvm = host_collection.get_vm_by_name (
restore_info[vm.name]['netvm'])
else:
host_vm.netvm = None
host_collection.save()
if lock_obtained:
host_collection.unlock_db()
if running_backup_operation.canceled:
if format_version >= 2:
raise BackupCanceledError("Restore canceled",
tmpdir=restore_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 format_version == 1:
backup_dom0_home_dir = os.path.join(backup_location, backup_path)
else:
backup_dom0_home_dir = os.path.join(restore_tmpdir, backup_path)
restore_home_backupdir = "home-pre-restore-{0}".format (time.strftime("%Y-%m-%d-%H%M%S"))
if callable(print_callback):
print_callback("-> Restoring home of user '{0}'...".format(local_user))
print_callback("--> 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 format_version == 1:
retcode = subprocess.call (["cp", "-nrp", backup_dom0_home_dir + '/' + f, home_file])
elif format_version >= 2:
shutil.move(backup_dom0_home_dir + '/' + f, home_file)
retcode = subprocess.call(['sudo', 'chown', '-R', local_user, home_dir])
if retcode != 0:
error_callback("*** Error while setting home directory owner")
shutil.rmtree(restore_tmpdir)
# vim:sw=4:et:
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