/usr/share/backintime/common/password.py is in backintime-common 1.1.12-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# 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.
import sys
import os
import time
import atexit
import signal
import subprocess
import gettext
import re
import errno
import config
import configfile
import tools
import password_ipc
import logger
from applicationinstance import ApplicationInstance
from exceptions import Timeout
_=gettext.gettext
class Daemon:
"""
A generic daemon class.
Usage: subclass the Daemon class and override the run() method
Daemon Copyright by Sander Marechal
License CC BY-SA 3.0
http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/
"""
def __init__(self, pidfile, stdin='/dev/null', stdout='/dev/stdout', stderr='/dev/null'):
self.stdin = stdin
self.stdout = stdout
self.stderr = stderr
self.pidfile = pidfile
self.appInstance = ApplicationInstance(pidfile, auto_exit = False, flock = False)
def daemonize(self):
"""
do the UNIX double-fork magic, see Stevens' "Advanced
Programming in the UNIX Environment" for details (ISBN 0201563177)
http://www.erlenstar.demon.co.uk/unix/faq_2.html#SEC16
"""
logger.debug('start', self)
try:
pid = os.fork()
if pid > 0:
# exit first parent
sys.exit(0)
except OSError as e:
logger.error("fork #1 failed: %d (%s)" % (e.errno, str(e)), self)
sys.exit(1)
# decouple from parent environment
os.chdir("/")
os.setsid()
os.umask(0)
# do second fork
try:
pid = os.fork()
if pid > 0:
# exit from second parent
sys.exit(0)
except OSError as e:
logger.error("fork #2 failed: %d (%s)" % (e.errno, str(e)), self)
sys.exit(1)
# redirect standard file descriptors
sys.stdout.flush()
sys.stderr.flush()
si = open(self.stdin, 'r')
so = open(self.stdout, 'w')
se = open(self.stderr, 'w')
os.dup2(si.fileno(), sys.stdin.fileno())
os.dup2(so.fileno(), sys.stdout.fileno())
os.dup2(se.fileno(), sys.stderr.fileno())
# write pidfile
logger.debug('write pidfile', self)
atexit.register(self.appInstance.exit_application)
signal.signal(signal.SIGTERM, self._cleanup_handler)
self.appInstance.start_application()
def _cleanup_handler(self, signum, frame):
self.fifo.delfifo()
self.appInstance.exit_application()
sys.exit(0)
def start(self):
"""
Start the daemon
"""
# Check for a pidfile to see if the daemon already runs
if not self.appInstance.check():
message = "pidfile %s already exist. Daemon already running?\n"
logger.error(message % self.pidfile, self)
sys.exit(1)
# Start the daemon
self.daemonize()
self.run()
def stop(self):
"""
Stop the daemon
"""
# Get the pid from the pidfile
pid, procname = self.appInstance.readPidFile()
if not pid:
message = "pidfile %s does not exist. Daemon not running?\n"
logger.error(message % self.pidfile, self)
return # not an error in a restart
# Try killing the daemon process
try:
while True:
os.kill(pid, signal.SIGTERM)
time.sleep(0.1)
except OSError as err:
if err.errno == errno.ESRCH:
#no such process
self.appInstance.exit_application()
else:
logger.error(str(err), self)
sys.exit(1)
def restart(self):
"""
Restart the daemon
"""
self.stop()
self.start()
def reload(self):
"""
send SIGHUP signal to process
"""
# Get the pid from the pidfile
pid, procname = self.appInstance.readPidFile()
if not pid:
message = "pidfile %s does not exist. Daemon not running?\n"
logger.error(message % self.pidfile, self)
return
# Try killing the daemon process
try:
os.kill(pid, signal.SIGHUP)
except OSError as err:
if err.errno == errno.ESRCH:
#no such process
self.appInstance.exit_application()
else:
sys.stderr.write(str(err))
sys.exit(1)
def status(self):
"""
return status
"""
return not self.appInstance.check()
def run(self):
"""
You should override this method when you subclass Daemon. It will be called after the process has been
daemonized by start() or restart().
"""
pass
class Password_Cache(Daemon):
"""
Password_Cache get started on User login. It provides passwords for
BIT cronjobs because keyring is not available when the User is not
logged in. Does not start if there is no password to cache
(e.g. no profile allows to cache).
"""
PW_CACHE_VERSION = 3
def __init__(self, cfg = None, *args, **kwargs):
self.config = cfg
if self.config is None:
self.config = config.Config()
pw_cache_path = self.config.get_password_cache_folder()
if not os.path.isdir(pw_cache_path):
os.mkdir(pw_cache_path, 0o700)
else:
os.chmod(pw_cache_path, 0o700)
Daemon.__init__(self, self.config.get_password_cache_pid(), *args, **kwargs)
self.db_keyring = {}
self.db_usr = {}
self.fifo = password_ipc.FIFO(self.config.get_password_cache_fifo())
self.keyring_supported = tools.keyring_supported()
def run(self):
"""
wait for password request on FIFO and answer with password
from self.db through FIFO.
"""
info = configfile.ConfigFile()
info.set_int_value('version', self.PW_CACHE_VERSION)
info.save(self.config.get_password_cache_info())
os.chmod(self.config.get_password_cache_info(), 0o600)
logger.debug('Keyring supported: %s' %self.keyring_supported, self)
tools.save_env(self.config.get_cron_env_file())
if not self._collect_passwords():
logger.debug('Nothing to cache. Quit.', self)
sys.exit(0)
self.fifo.create()
atexit.register(self.fifo.delfifo)
signal.signal(signal.SIGHUP, self._reload_handler)
logger.debug('Start loop', self)
while True:
try:
request = self.fifo.read()
request = request.split('\n')[0]
task, value = request.split(':', 1)
if task == 'get_pw':
key = value
if key in list(self.db_keyring.keys()):
answer = 'pw:' + self.db_keyring[key]
elif key in list(self.db_usr.keys()):
answer = 'pw:' + self.db_usr[key]
else:
answer = 'none:'
self.fifo.write(answer, 5)
elif task == 'set_pw':
key, value = value.split(':', 1)
self.db_usr[key] = value
except IOError as e:
logger.error('Error in writing answer to FIFO: %s' % str(e), self)
except KeyboardInterrupt:
logger.debug('Quit.', self)
break
except Timeout:
logger.error('FIFO timeout', self)
except Exception as e:
logger.error('ERROR: %s' % str(e), self)
def _reload_handler(self, signum, frame):
"""
reload passwords during runtime.
"""
time.sleep(2)
cfgPath = self.config._LOCAL_CONFIG_PATH
del(self.config)
self.config = config.Config(cfgPath)
del(self.db_keyring)
self.db_keyring = {}
self._collect_passwords()
def _collect_passwords(self):
"""
search all profiles in config and collect passwords from keyring.
"""
run_daemon = False
profiles = self.config.get_profiles()
for profile_id in profiles:
mode = self.config.get_snapshots_mode(profile_id)
for pw_id in (1, 2):
if self.config.mode_need_password(mode, pw_id):
if self.config.get_password_use_cache(profile_id):
run_daemon = True
if self.config.get_password_save(profile_id) and self.keyring_supported:
service_name = self.config.get_keyring_service_name(profile_id, mode, pw_id)
user_name = self.config.get_keyring_user_name(profile_id)
password = tools.get_password(service_name, user_name)
if password is None:
continue
self.db_keyring['%s/%s' %(service_name, user_name)] = password
return run_daemon
def check_version(self):
info = configfile.ConfigFile()
info.load(self.config.get_password_cache_info())
if info.get_int_value('version') < self.PW_CACHE_VERSION:
return False
return True
class Password(object):
"""
provide passwords for BIT either from keyring, Password_Cache or
by asking User.
"""
def __init__(self, cfg = None):
self.config = cfg
if self.config is None:
self.config = config.Config()
self.pw_cache = Password_Cache(self.config)
self.fifo = password_ipc.FIFO(self.config.get_password_cache_fifo())
self.db = {}
self.keyring_supported = tools.keyring_supported()
def get_password(self, parent, profile_id, mode, pw_id = 1, only_from_keyring = False):
"""
based on profile settings return password from keyring,
Password_Cache or by asking User.
"""
if not self.config.mode_need_password(mode, pw_id):
return ''
service_name = self.config.get_keyring_service_name(profile_id, mode, pw_id)
user_name = self.config.get_keyring_user_name(profile_id)
try:
return self.db['%s/%s' %(service_name, user_name)]
except KeyError:
pass
password = ''
if self.config.get_password_use_cache(profile_id) and not only_from_keyring:
#from pw_cache
password = self._get_password_from_pw_cache(service_name, user_name)
if not password is None:
self._set_password_db(service_name, user_name, password)
return password
if self.config.get_password_save(profile_id):
#from keyring
password = self._get_password_from_keyring(service_name, user_name)
if not password is None:
self._set_password_db(service_name, user_name, password)
return password
if not only_from_keyring:
#ask user and write to cache
password = self._get_password_from_user(parent, profile_id, mode, pw_id)
if self.config.get_password_use_cache(profile_id):
self._set_password_to_cache(service_name, user_name, password)
self._set_password_db(service_name, user_name, password)
return password
return password
def _get_password_from_keyring(self, service_name, user_name):
"""
get password from system keyring (seahorse). The keyring is only
available if User is logged in.
"""
if self.keyring_supported:
try:
return tools.get_password(service_name, user_name)
except Exception:
logger.error('get password from Keyring failed', self)
return None
def _get_password_from_pw_cache(self, service_name, user_name):
"""
get password from Password_Cache
"""
if self.pw_cache.status():
self.pw_cache.check_version()
self.fifo.write('get_pw:%s/%s' %(service_name, user_name), timeout = 5)
answer = self.fifo.read(timeout = 5)
mode, pw = answer.split(':', 1)
if mode == 'none':
return None
return pw
else:
return None
def _get_password_from_user(self, parent, profile_id = None, mode = None, pw_id = 1, prompt = None):
"""
ask user for password. This does even work when run as cronjob
and user is logged in.
"""
if prompt is None:
prompt = _('Profile \'%(profile)s\': Enter password for %(mode)s: ') % {'profile': self.config.get_profile_name(profile_id), 'mode': self.config.SNAPSHOT_MODES[mode][pw_id + 1]}
tools.register_backintime_path('qt4')
x_server = tools.check_x_server()
import_successful = False
if x_server:
try:
import messagebox
import_successful = True
except ImportError:
pass
if not import_successful or not x_server:
import getpass
alarm = tools.Alarm()
alarm.start(300)
try:
password = getpass.getpass(prompt)
alarm.stop()
except Timeout:
password = ''
return password
password = messagebox.ask_password_dialog(parent, self.config.APP_NAME,
prompt = prompt,
timeout = 300)
return password
def _set_password_db(self, service_name, user_name, password):
"""
internal Password cache. Prevent to ask password several times
during runtime.
"""
self.db['%s/%s' %(service_name, user_name)] = password
def set_password(self, password, profile_id, mode, pw_id):
"""
store password to keyring and Password_Cache
"""
if self.config.mode_need_password(mode, pw_id):
service_name = self.config.get_keyring_service_name(profile_id, mode, pw_id)
user_name = self.config.get_keyring_user_name(profile_id)
if self.config.get_password_save(profile_id):
self._set_password_to_keyring(service_name, user_name, password)
if self.config.get_password_use_cache(profile_id):
self._set_password_to_cache(service_name, user_name, password)
self._set_password_db(service_name, user_name, password)
def _set_password_to_keyring(self, service_name, user_name, password):
return tools.set_password(service_name, user_name, password)
def _set_password_to_cache(self, service_name, user_name, password):
if self.pw_cache.status():
self.pw_cache.check_version()
self.fifo.write('set_pw:%s/%s:%s' %(service_name, user_name, password), timeout = 5)
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