/mandos/release : revision 237.7.211

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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# along with this program. If not, see

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# <http://www.gnu.org/licenses/>.

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#

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# Contact the authors at <mandos@fukt.bsnet.se>.

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# Contact the authors at <mandos@recompile.se>.

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#

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/dev/log")))

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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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version = "1.6.4"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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(ctypes.util.find_library("c"))

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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"Get an interface index the hard way, i.e. using fcntl()"

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(str("16s16x"),

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/dev/log")))

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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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logger.addHandler(syslogger)

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if debug:

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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def __enter__(self):

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return self

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def __exit__(self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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encoded = b"mandos" + binascii.hexlify(password)

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if len(encoded) > 2048:

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# GnuPG can't handle long passwords, so encode differently

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encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

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.replace(b"\n", b"\\n")

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.replace(b"\0", b"\\x00"))

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return encoded

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--symmetric',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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ciphertext, err = proc.communicate(input = data)

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if proc.returncode != 0:

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raise PGPError(err)

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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return decrypted_plaintext

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class AvahiError(Exception):

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def __init__(self, value, *args, **kwargs):

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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type: string; Example: '_mandos._tcp'.

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See <http://www.dns-sd.org/ServiceTypes.html>

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See <https://www.iana.org/assignments/service-names-port-numbers>

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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domain: string; Domain to publish on, default to .local if empty.

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self, interface = avahi.IF_UNSPEC, name = None,

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servicetype = None, port = None, TXT = None,

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domain = "", host = "", max_renames = 32768,

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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"""Derived from the Avahi example code"""

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if self.rename_count >= self.max_renames:

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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syslogger.setFormatter(logging.Formatter

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('Mandos (%s) [%%(process)d]:'

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' %%(levelname)s: %%(message)s'

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% self.name))

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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logger.critical("DBusException: %s", error)

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logger.critical("D-Bus Exception", exc_info=error)

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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"""Derived from the Avahi example code"""

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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"""Derived from the Avahi example code"""

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self.remove()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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logger.debug("Adding Zeroconf service '%s' of type '%s' ...",

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self.name, self.type)

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self.group.AddService(

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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"""Derived from the Avahi example code"""

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logger.debug("Avahi entry group state change: %i", state)

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elif state == avahi.ENTRY_GROUP_FAILURE:

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logger.critical("Avahi: Error in group state changed %s",

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unicode(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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raise AvahiGroupError("State changed: {0!s}"

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.format(error))

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def cleanup(self):

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"""Derived from the Avahi example code"""

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if self.group is not None:

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

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dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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def server_state_changed(self, state, error=None):

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"""Derived from the Avahi example code"""

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logger.debug("Avahi server state change: %i", state)

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logger.debug("Unknown state: %r", state)

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else:

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logger.debug("Unknown state: %r: %r", state, error)

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def activate(self):

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"""Derived from the Avahi example code"""

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if self.server is None:

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self.server_state_changed(self.server.GetState())

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def _timedelta_to_milliseconds(td):

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({0}) [%(process)d]:'

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' %(levelname)s: %(message)s'

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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"""A representation of a client host served by this server.

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Attributes:

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_approved: bool(); 'None' if not yet approved/disapproved

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approved: bool(); 'None' if not yet approved/disapproved

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approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

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checker: subprocess.Popen(); a running checker process used

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instance %(name)s can be used in the command.

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checker_initiator_tag: a gobject event source tag, or None

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created: datetime.datetime(); (UTC) object creation

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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disable_hook: If set, called by disable() as disable_hook(self)

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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fingerprint: string (40 or 32 hexadecimal digits); used to

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interval: datetime.timedelta(); How often to start a new checker

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last_approval_request: datetime.datetime(); (UTC) or None

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last_checked_ok: datetime.datetime(); (UTC) or None

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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last_enabled: datetime.datetime(); (UTC) or None

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name: string; from the config file, used in log messages and

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D-Bus identifiers

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secret: bytestring; sent verbatim (over TLS) to client

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timeout: datetime.timedelta(); How long from last_checked_ok

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until this client is disabled

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extended_timeout: extra long timeout when password has been sent

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extended_timeout: extra long timeout when secret has been sent

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runtime_expansions: Allowed attributes for runtime expansion.

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expires: datetime.datetime(); time (UTC) when a client will be

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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"created", "enabled", "fingerprint",

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"host", "interval", "last_checked_ok",

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"created", "enabled", "expires",

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"fingerprint", "host", "interval",

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"last_approval_request", "last_checked_ok",

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"last_enabled", "name", "timeout")

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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"checker": "fping -q -- %%(host)s",

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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def __init__(self, name = None, disable_hook=None, config=None):

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"""Note: the 'checker' key in 'config' sets the

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'checker_command' attribute and *not* the 'checker'

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attribute."""

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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"""Construct a new dict of client settings of this form:

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{ client_name: {setting_name: value, ...}, ...}

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with exceptions for any special settings as defined above.

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NOTE: Must be a pure function. Must return the same result

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value given the same arguments.

492

"""

493

settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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client["host"] = section["host"]

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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client["enabled"] = config.getboolean(client_name,

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"enabled")

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client["fingerprint"] = (section["fingerprint"].upper()

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.replace(" ", ""))

507

if "secret" in section:

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client["secret"] = section["secret"].decode("base64")

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elif "secfile" in section:

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with open(os.path.expanduser(os.path.expandvars

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(section["secfile"])),

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"rb") as secfile:

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client["secret"] = secfile.read()

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else:

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raise TypeError("No secret or secfile for section {0}"

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.format(section))

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client["timeout"] = string_to_delta(section["timeout"])

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["interval"] = string_to_delta(section["interval"])

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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client["checker_command"] = section["checker"]

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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return settings

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532

def __init__(self, settings, name = None, server_settings=None):

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self.name = name

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if config is None:

339

config = {}

534

if server_settings is None:

535

server_settings = {}

536

self.server_settings = server_settings

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# adding all client settings

538

for setting, value in settings.iteritems():

539

setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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self.expires = (datetime.datetime.utcnow()

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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logger.debug("Creating client %r", self.name)

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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554

# function

344

self.fingerprint = (config["fingerprint"].upper()

345

.replace(" ", ""))

346

555

logger.debug(" Fingerprint: %s", self.fingerprint)

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if "secret" in config:

348

self.secret = config["secret"].decode("base64")

349

elif "secfile" in config:

350

with open(os.path.expanduser(os.path.expandvars

351

(config["secfile"])),

352

"rb") as secfile:

353

self.secret = secfile.read()

354

else:

355

raise TypeError("No secret or secfile for client %s"

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% self.name)

357

self.host = config.get("host", "")

358

self.created = datetime.datetime.utcnow()

359

self.enabled = False

360

self.last_approval_request = None

361

self.last_enabled = None

362

self.last_checked_ok = None

363

self.timeout = string_to_delta(config["timeout"])

364

self.extended_timeout = string_to_delta(config["extended_timeout"])

365

self.interval = string_to_delta(config["interval"])

366

self.disable_hook = disable_hook

556

self.created = settings.get("created",

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datetime.datetime.utcnow())

558

559

# attributes specific for this server instance

367

560

self.checker = None

368

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

370

self.expires = None

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563

self.checker_callback_tag = None

372

self.checker_command = config["checker"]

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self.current_checker_command = None

374

self.last_connect = None

375

self._approved = None

376

self.approved_by_default = config.get("approved_by_default",

377

True)

565

self.approved = None

378

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self.approvals_pending = 0

379

self.approval_delay = string_to_delta(

380

config["approval_delay"])

381

self.approval_duration = string_to_delta(

382

config["approval_duration"])

383

self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

567

self.changedstate = (multiprocessing_manager

568

.Condition(multiprocessing_manager

569

.Lock()))

570

self.client_structure = [attr for attr in

571

self.__dict__.iterkeys()

572

if not attr.startswith("_")]

573

self.client_structure.append("client_structure")

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for name, t in inspect.getmembers(type(self),

576

lambda obj:

577

isinstance(obj,

578

property)):

579

if not name.startswith("_"):

580

self.client_structure.append(name)

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582

# Send notice to process children that client state has changed

385

583

def send_changedstate(self):

386

self.changedstate.acquire()

387

self.changedstate.notify_all()

388

self.changedstate.release()

389

584

with self.changedstate:

585

self.changedstate.notify_all()

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def enable(self):

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588

"""Start this client's checker and timeout hooks"""

392

589

if getattr(self, "enabled", False):

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# Already enabled

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return

592

self.expires = datetime.datetime.utcnow() + self.timeout

593

self.enabled = True

594

self.last_enabled = datetime.datetime.utcnow()

595

self.init_checker()

395

596

self.send_changedstate()

597

598

def disable(self, quiet=True):

599

"""Disable this client."""

600

if not getattr(self, "enabled", False):

601

return False

602

if not quiet:

603

logger.info("Disabling client %s", self.name)

604

if getattr(self, "disable_initiator_tag", None) is not None:

605

gobject.source_remove(self.disable_initiator_tag)

606

self.disable_initiator_tag = None

607

self.expires = None

608

if getattr(self, "checker_initiator_tag", None) is not None:

609

gobject.source_remove(self.checker_initiator_tag)

610

self.checker_initiator_tag = None

611

self.stop_checker()

612

self.enabled = False

613

if not quiet:

614

self.send_changedstate()

615

# Do not run this again if called by a gobject.timeout_add

616

return False

617

618

def __del__(self):

619

self.disable()

620

621

def init_checker(self):

396

622

# Schedule a new checker to be started an 'interval' from now,

397

623

# and every interval from then on.

624

if self.checker_initiator_tag is not None:

625

gobject.source_remove(self.checker_initiator_tag)

398

626

self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

401

629

# Schedule a disable() when 'timeout' has passed

402

self.expires = datetime.datetime.utcnow() + self.timeout

630

if self.disable_initiator_tag is not None:

631

gobject.source_remove(self.disable_initiator_tag)

403

632

self.disable_initiator_tag = (gobject.timeout_add

404

633

(self.timeout_milliseconds(),

405

634

self.disable))

406

self.enabled = True

407

self.last_enabled = datetime.datetime.utcnow()

408

635

# Also start a new checker *right now*.

409

636

self.start_checker()

410

637

411

def disable(self, quiet=True):

412

"""Disable this client."""

413

if not getattr(self, "enabled", False):

414

return False

415

if not quiet:

416

self.send_changedstate()

417

if not quiet:

418

logger.info("Disabling client %s", self.name)

419

if getattr(self, "disable_initiator_tag", False):

420

gobject.source_remove(self.disable_initiator_tag)

421

self.disable_initiator_tag = None

422

self.expires = None

423

if getattr(self, "checker_initiator_tag", False):

424

gobject.source_remove(self.checker_initiator_tag)

425

self.checker_initiator_tag = None

426

self.stop_checker()

427

if self.disable_hook:

428

self.disable_hook(self)

429

self.enabled = False

430

# Do not run this again if called by a gobject.timeout_add

431

return False

432

433

def __del__(self):

434

self.disable_hook = None

435

self.disable()

436

437

638

def checker_callback(self, pid, condition, command):

438

639

"""The checker has completed, so take appropriate actions."""

439

640

self.checker_callback_tag = None

440

641

self.checker = None

441

642

if os.WIFEXITED(condition):

442

exitstatus = os.WEXITSTATUS(condition)

443

if exitstatus == 0:

643

self.last_checker_status = os.WEXITSTATUS(condition)

644

if self.last_checker_status == 0:

444

645

logger.info("Checker for %(name)s succeeded",

445

646

vars(self))

446

647

self.checked_ok()

448

649

logger.info("Checker for %(name)s failed",

449

650

vars(self))

450

651

else:

652

self.last_checker_status = -1

451

653

logger.warning("Checker for %(name)s crashed?",

452

654

vars(self))

453

655

454

def checked_ok(self, timeout=None):

455

"""Bump up the timeout for this client.

456

457

This should only be called when the client has been seen,

458

alive and well.

459

"""

656

def checked_ok(self):

657

"""Assert that the client has been seen, alive and well."""

658

self.last_checked_ok = datetime.datetime.utcnow()

659

self.last_checker_status = 0

660

self.bump_timeout()

661

662

def bump_timeout(self, timeout=None):

663

"""Bump up the timeout for this client."""

460

664

if timeout is None:

461

665

timeout = self.timeout

462

self.last_checked_ok = datetime.datetime.utcnow()

463

gobject.source_remove(self.disable_initiator_tag)

464

self.expires = datetime.datetime.utcnow() + timeout

465

self.disable_initiator_tag = (gobject.timeout_add

466

(_timedelta_to_milliseconds(timeout),

467

self.disable))

666

if self.disable_initiator_tag is not None:

667

gobject.source_remove(self.disable_initiator_tag)

668

self.disable_initiator_tag = None

669

if getattr(self, "enabled", False):

670

self.disable_initiator_tag = (gobject.timeout_add

671

(timedelta_to_milliseconds

672

(timeout), self.disable))

673

self.expires = datetime.datetime.utcnow() + timeout

468

674

469

675

def need_approval(self):

470

676

self.last_approval_request = datetime.datetime.utcnow()

475

681

If a checker already exists, leave it running and do

476

682

nothing."""

477

683

# The reason for not killing a running checker is that if we

478

# did that, then if a checker (for some reason) started

479

# running slowly and taking more than 'interval' time, the

480

# client would inevitably timeout, since no checker would get

481

# a chance to run to completion. If we instead leave running

684

# did that, and if a checker (for some reason) started running

685

# slowly and taking more than 'interval' time, then the client

686

# would inevitably timeout, since no checker would get a

687

# chance to run to completion. If we instead leave running

482

688

# checkers alone, the checker would have to take more time

483

689

# than 'timeout' for the client to be disabled, which is as it

484

690

# should be.

486

692

# If a checker exists, make sure it is not a zombie

487

693

try:

488

694

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

489

except (AttributeError, OSError) as error:

490

if (isinstance(error, OSError)

491

and error.errno != errno.ECHILD):

492

raise error

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

493

700

else:

494

701

if pid:

495

702

logger.warning("Checker was a zombie")

498

705

self.current_checker_command)

499

706

# Start a new checker if needed

500

707

if self.checker is None:

708

# Escape attributes for the shell

709

escaped_attrs = dict(

710

(attr, re.escape(unicode(getattr(self, attr))))

711

for attr in

712

self.runtime_expansions)

501

713

try:

502

# In case checker_command has exactly one % operator

503

command = self.checker_command % self.host

504

except TypeError:

505

# Escape attributes for the shell

506

escaped_attrs = dict(

507

(attr,

508

re.escape(unicode(str(getattr(self, attr, "")),

509

errors=

510

'replace')))

511

for attr in

512

self.runtime_expansions)

513

514

try:

515

command = self.checker_command % escaped_attrs

516

except TypeError as error:

517

logger.error('Could not format string "%s":'

518

' %s', self.checker_command, error)

519

return True # Try again later

714

command = self.checker_command % escaped_attrs

715

except TypeError as error:

716

logger.error('Could not format string "%s"',

717

self.checker_command, exc_info=error)

718

return True # Try again later

520

719

self.current_checker_command = command

521

720

try:

522

721

logger.info("Starting checker %r for %s",

525

724

# in normal mode, that is already done by daemon(),

526

725

# and in debug mode we don't want to. (Stdin is

527

726

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

528

735

self.checker = subprocess.Popen(command,

529

736

close_fds=True,

530

shell=True, cwd="/")

531

self.checker_callback_tag = (gobject.child_watch_add

532

(self.checker.pid,

533

self.checker_callback,

534

data=command))

535

# The checker may have completed before the gobject

536

# watch was added. Check for this.

737

shell=True, cwd="/",

738

**popen_args)

739

except OSError as error:

740

logger.error("Failed to start subprocess",

741

exc_info=error)

742

return True

743

self.checker_callback_tag = (gobject.child_watch_add

744

(self.checker.pid,

745

self.checker_callback,

746

data=command))

747

# The checker may have completed before the gobject

748

# watch was added. Check for this.

749

try:

537

750

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

538

if pid:

539

gobject.source_remove(self.checker_callback_tag)

540

self.checker_callback(pid, status, command)

541

751

except OSError as error:

542

logger.error("Failed to start subprocess: %s",

543

error)

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

758

if pid:

759

gobject.source_remove(self.checker_callback_tag)

760

self.checker_callback(pid, status, command)

544

761

# Re-run this periodically if run by gobject.timeout_add

545

762

return True

546

763

553

770

return

554

771

logger.debug("Stopping checker for %(name)s", vars(self))

555

772

try:

556

os.kill(self.checker.pid, signal.SIGTERM)

773

self.checker.terminate()

557

774

#time.sleep(0.5)

558

775

#if self.checker.poll() is None:

559

# os.kill(self.checker.pid, signal.SIGKILL)

776

# self.checker.kill()

560

777

except OSError as error:

561

778

if error.errno != errno.ESRCH: # No such process

562

779

raise

579

796

# "Set" method, so we fail early here:

580

797

if byte_arrays and signature != "ay":

581

798

raise ValueError("Byte arrays not supported for non-'ay'"

582

" signature %r" % signature)

799

" signature {0!r}".format(signature))

583

800

def decorator(func):

584

801

func._dbus_is_property = True

585

802

func._dbus_interface = dbus_interface

593

810

return decorator

594

811

595

812

813

def dbus_interface_annotations(dbus_interface):

814

"""Decorator for marking functions returning interface annotations

815

816

Usage:

817

818

@dbus_interface_annotations("org.example.Interface")

819

def _foo(self): # Function name does not matter

820

return {"org.freedesktop.DBus.Deprecated": "true",

821

"org.freedesktop.DBus.Property.EmitsChangedSignal":

822

"false"}

823

"""

824

def decorator(func):

825

func._dbus_is_interface = True

826

func._dbus_interface = dbus_interface

827

func._dbus_name = dbus_interface

828

return func

829

return decorator

830

831

832

def dbus_annotations(annotations):

833

"""Decorator to annotate D-Bus methods, signals or properties

834

Usage:

835

836

@dbus_service_property("org.example.Interface", signature="b",

837

access="r")

838

@dbus_annotations({{"org.freedesktop.DBus.Deprecated": "true",

839

"org.freedesktop.DBus.Property."

840

"EmitsChangedSignal": "false"})

841

def Property_dbus_property(self):

842

return dbus.Boolean(False)

843

"""

844

def decorator(func):

845

func._dbus_annotations = annotations

846

return func

847

return decorator

848

849

596

850

class DBusPropertyException(dbus.exceptions.DBusException):

597

851

"""A base class for D-Bus property-related exceptions

598

852

"""

621

875

"""

622

876

623

877

@staticmethod

624

def _is_dbus_property(obj):

625

return getattr(obj, "_dbus_is_property", False)

878

def _is_dbus_thing(thing):

879

"""Returns a function testing if an attribute is a D-Bus thing

880

881

If called like _is_dbus_thing("method") it returns a function

882

suitable for use as predicate to inspect.getmembers().

883

"""

884

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

885

False)

626

886

627

def _get_all_dbus_properties(self):

887

def _get_all_dbus_things(self, thing):

628

888

"""Returns a generator of (name, attribute) pairs

629

889

"""

630

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

890

return ((getattr(athing.__get__(self), "_dbus_name",

891

name),

892

athing.__get__(self))

631

893

for cls in self.__class__.__mro__

632

for name, prop in inspect.getmembers(cls, self._is_dbus_property))

894

for name, athing in

895

inspect.getmembers(cls,

896

self._is_dbus_thing(thing)))

633

897

634

898

def _get_dbus_property(self, interface_name, property_name):

635

899

"""Returns a bound method if one exists which is a D-Bus

636

900

property with the specified name and interface.

637

901

"""

638

902

for cls in self.__class__.__mro__:

639

for name, value in inspect.getmembers(cls, self._is_dbus_property):

640

if value._dbus_name == property_name and value._dbus_interface == interface_name:

903

for name, value in (inspect.getmembers

904

(cls,

905

self._is_dbus_thing("property"))):

906

if (value._dbus_name == property_name

907

and value._dbus_interface == interface_name):

641

908

return value.__get__(self)

642

909

643

910

# No such property

669

936

# The byte_arrays option is not supported yet on

670

937

# signatures other than "ay".

671

938

if prop._dbus_signature != "ay":

672

raise ValueError

673

value = dbus.ByteArray(''.join(unichr(byte)

674

for byte in value))

939

raise ValueError("Byte arrays not supported for non-"

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

942

value = dbus.ByteArray(b''.join(chr(byte)

943

for byte in value))

675

944

prop(value)

676

945

677

946

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",

682

951

683

952

Note: Will not include properties with access="write".

684

953

"""

685

all = {}

686

for name, prop in self._get_all_dbus_properties():

954

properties = {}

955

for name, prop in self._get_all_dbus_things("property"):

687

956

if (interface_name

688

957

and interface_name != prop._dbus_interface):

689

958

# Interface non-empty but did not match

693

962

continue

694

963

value = prop()

695

964

if not hasattr(value, "variant_level"):

696

all[name] = value

965

properties[name] = value

697

966

continue

698

all[name] = type(value)(value, variant_level=

699

value.variant_level+1)

700

return dbus.Dictionary(all, signature="sv")

967

properties[name] = type(value)(value, variant_level=

968

value.variant_level+1)

969

return dbus.Dictionary(properties, signature="sv")

701

970

702

971

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

703

972

out_signature="s",

704

973

path_keyword='object_path',

705

974

connection_keyword='connection')

706

975

def Introspect(self, object_path, connection):

707

"""Standard D-Bus method, overloaded to insert property tags.

976

"""Overloading of standard D-Bus method.

977

978

Inserts property tags and interface annotation tags.

708

979

"""

709

980

xmlstring = dbus.service.Object.Introspect(self, object_path,

710

981

connection)

717

988

e.setAttribute("access", prop._dbus_access)

718

989

return e

719

990

for if_tag in document.getElementsByTagName("interface"):

991

# Add property tags

720

992

for tag in (make_tag(document, name, prop)

721

993

for name, prop

722

in self._get_all_dbus_properties()

994

in self._get_all_dbus_things("property")

723

995

if prop._dbus_interface

724

996

== if_tag.getAttribute("name")):

725

997

if_tag.appendChild(tag)

998

# Add annotation tags

999

for typ in ("method", "signal", "property"):

1000

for tag in if_tag.getElementsByTagName(typ):

1001

annots = dict()

1002

for name, prop in (self.

1003

_get_all_dbus_things(typ)):

1004

if (name == tag.getAttribute("name")

1005

and prop._dbus_interface

1006

== if_tag.getAttribute("name")):

1007

annots.update(getattr

1008

(prop,

1009

"_dbus_annotations",

1010

{}))

1011

for name, value in annots.iteritems():

1012

ann_tag = document.createElement(

1013

"annotation")

1014

ann_tag.setAttribute("name", name)

1015

ann_tag.setAttribute("value", value)

1016

tag.appendChild(ann_tag)

1017

# Add interface annotation tags

1018

for annotation, value in dict(

1019

itertools.chain.from_iterable(

1020

annotations().iteritems()

1021

for name, annotations in

1022

self._get_all_dbus_things("interface")

1023

if name == if_tag.getAttribute("name")

1024

)).iteritems():

1025

ann_tag = document.createElement("annotation")

1026

ann_tag.setAttribute("name", annotation)

1027

ann_tag.setAttribute("value", value)

1028

if_tag.appendChild(ann_tag)

726

1029

# Add the names to the return values for the

727

1030

# "org.freedesktop.DBus.Properties" methods

728

1031

if (if_tag.getAttribute("name")

743

1046

except (AttributeError, xml.dom.DOMException,

744

1047

xml.parsers.expat.ExpatError) as error:

745

1048

logger.error("Failed to override Introspection method",

746

error)

1049

exc_info=error)

747

1050

return xmlstring

748

1051

749

1052

750

def datetime_to_dbus (dt, variant_level=0):

1053

def datetime_to_dbus(dt, variant_level=0):

751

1054

"""Convert a UTC datetime.datetime() to a D-Bus type."""

752

1055

if dt is None:

753

1056

return dbus.String("", variant_level = variant_level)

754

1057

return dbus.String(dt.isoformat(),

755

1058

variant_level=variant_level)

756

1059

757

class AlternateDBusNamesMetaclass(DBusObjectWithProperties.__metaclass__):

758

"""Applied to an empty subclass of a D-Bus object, this metaclass

759

will add additional D-Bus attributes matching a certain pattern.

1060

1061

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1062

"""A class decorator; applied to a subclass of

1063

dbus.service.Object, it will add alternate D-Bus attributes with

1064

interface names according to the "alt_interface_names" mapping.

1065

Usage:

1066

1067

@alternate_dbus_interfaces({"org.example.Interface":

1068

"net.example.AlternateInterface"})

1069

class SampleDBusObject(dbus.service.Object):

1070

@dbus.service.method("org.example.Interface")

1071

def SampleDBusMethod():

1072

pass

1073

1074

The above "SampleDBusMethod" on "SampleDBusObject" will be

1075

reachable via two interfaces: "org.example.Interface" and

1076

"net.example.AlternateInterface", the latter of which will have

1077

its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to

1078

"true", unless "deprecate" is passed with a False value.

1079

1080

This works for methods and signals, and also for D-Bus properties

1081

(from DBusObjectWithProperties) and interfaces (from the

1082

dbus_interface_annotations decorator).

760

1083

"""

761

def __new__(mcs, name, bases, attr):

762

# Go through all the base classes which could have D-Bus

763

# methods, signals, or properties in them

764

for base in (b for b in bases

765

if issubclass(b, dbus.service.Object)):

766

# Go though all attributes of the base class

767

for attrname, attribute in inspect.getmembers(base):

1084

def wrapper(cls):

1085

for orig_interface_name, alt_interface_name in (

1086

alt_interface_names.iteritems()):

1087

attr = {}

1088

interface_names = set()

1089

# Go though all attributes of the class

1090

for attrname, attribute in inspect.getmembers(cls):

768

1091

# Ignore non-D-Bus attributes, and D-Bus attributes

769

1092

# with the wrong interface name

770

1093

if (not hasattr(attribute, "_dbus_interface")

771

1094

or not attribute._dbus_interface

772

.startswith("se.recompile.Mandos")):

1095

.startswith(orig_interface_name)):

773

1096

continue

774

1097

# Create an alternate D-Bus interface name based on

775

1098

# the current name

776

1099

alt_interface = (attribute._dbus_interface

777

.replace("se.recompile.Mandos",

778

"se.bsnet.fukt.Mandos"))

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

779

1103

# Is this a D-Bus signal?

780

1104

if getattr(attribute, "_dbus_is_signal", False):

781

# Extract the original non-method function by

782

# black magic

1105

# Extract the original non-method undecorated

1106

# function by black magic

783

1107

nonmethod_func = (dict(

784

1108

zip(attribute.func_code.co_freevars,

785

1109

attribute.__closure__))["func"]

796

1120

nonmethod_func.func_name,

797

1121

nonmethod_func.func_defaults,

798

1122

nonmethod_func.func_closure)))

1123

# Copy annotations, if any

1124

try:

1125

new_function._dbus_annotations = (

1126

dict(attribute._dbus_annotations))

1127

except AttributeError:

1128

pass

799

1129

# Define a creator of a function to call both the

800

# old and new functions, so both the old and new

801

# signals gets sent when the function is called

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

802

1133

def fixscope(func1, func2):

803

1134

"""This function is a scope container to pass

804

1135

func1 and func2 to the "call_both" function

811

1142

return call_both

812

1143

# Create the "call_both" function and add it to

813

1144

# the class

814

attr[attrname] = fixscope(attribute,

815

new_function)

1145

attr[attrname] = fixscope(attribute, new_function)

816

1146

# Is this a D-Bus method?

817

1147

elif getattr(attribute, "_dbus_is_method", False):

818

1148

# Create a new, but exactly alike, function

829

1159

attribute.func_name,

830

1160

attribute.func_defaults,

831

1161

attribute.func_closure)))

1162

# Copy annotations, if any

1163

try:

1164

attr[attrname]._dbus_annotations = (

1165

dict(attribute._dbus_annotations))

1166

except AttributeError:

1167

pass

832

1168

# Is this a D-Bus property?

833

1169

elif getattr(attribute, "_dbus_is_property", False):

834

1170

# Create a new, but exactly alike, function

848

1184

attribute.func_name,

849

1185

attribute.func_defaults,

850

1186

attribute.func_closure)))

851

return type.__new__(mcs, name, bases, attr)

852

1187

# Copy annotations, if any

1188

try:

1189

attr[attrname]._dbus_annotations = (

1190

dict(attribute._dbus_annotations))

1191

except AttributeError:

1192

pass

1193

# Is this a D-Bus interface?

1194

elif getattr(attribute, "_dbus_is_interface", False):

1195

# Create a new, but exactly alike, function

1196

# object. Decorate it to be a new D-Bus interface

1197

# with the alternate D-Bus interface name. Add it

1198

# to the class.

1199

attr[attrname] = (dbus_interface_annotations

1200

(alt_interface)

1201

(types.FunctionType

1202

(attribute.func_code,

1203

attribute.func_globals,

1204

attribute.func_name,

1205

attribute.func_defaults,

1206

attribute.func_closure)))

1207

if deprecate:

1208

# Deprecate all alternate interfaces

1209

iname="_AlternateDBusNames_interface_annotation{0}"

1210

for interface_name in interface_names:

1211

@dbus_interface_annotations(interface_name)

1212

def func(self):

1213

return { "org.freedesktop.DBus.Deprecated":

1214

"true" }

1215

# Find an unused name

1216

for aname in (iname.format(i)

1217

for i in itertools.count()):

1218

if aname not in attr:

1219

attr[aname] = func

1220

break

1221

if interface_names:

1222

# Replace the class with a new subclass of it with

1223

# methods, signals, etc. as created above.

1224

cls = type(b"{0}Alternate".format(cls.__name__),

1225

(cls,), attr)

1226

return cls

1227

return wrapper

1228

1229

1230

@alternate_dbus_interfaces({"se.recompile.Mandos":

1231

"se.bsnet.fukt.Mandos"})

853

1232

class ClientDBus(Client, DBusObjectWithProperties):

854

1233

"""A Client class using D-Bus

855

1234

864

1243

# dbus.service.Object doesn't use super(), so we can't either.

865

1244

866

1245

def __init__(self, bus = None, *args, **kwargs):

867

self._approvals_pending = 0

868

1246

self.bus = bus

869

1247

Client.__init__(self, *args, **kwargs)

870

1248

# Only now, when this client is initialized, can it show up on

876

1254

("/clients/" + client_object_name))

877

1255

DBusObjectWithProperties.__init__(self, self.bus,

878

1256

self.dbus_object_path)

879

1257

880

1258

def notifychangeproperty(transform_func,

881

1259

dbus_name, type_func=lambda x: x,

882

1260

variant_level=1):

883

1261

""" Modify a variable so that it's a property which announces

884

1262

its changes to DBus.

885

886

transform_fun: Function that takes a value and transforms it

887

to a D-Bus type.

1263

1264

transform_fun: Function that takes a value and a variant_level

1265

and transforms it to a D-Bus type.

888

1266

dbus_name: D-Bus name of the variable

889

1267

type_func: Function that transform the value before sending it

890

1268

to the D-Bus. Default: no transform

891

1269

variant_level: D-Bus variant level. Default: 1

892

1270

"""

893

real_value = [None,]

1271

attrname = "_{0}".format(dbus_name)

894

1272

def setter(self, value):

895

old_value = real_value[0]

896

real_value[0] = value

897

1273

if hasattr(self, "dbus_object_path"):

898

if type_func(old_value) != type_func(real_value[0]):

899

dbus_value = transform_func(type_func(real_value[0]),

900

variant_level)

1274

if (not hasattr(self, attrname) or

1275

type_func(getattr(self, attrname, None))

1276

!= type_func(value)):

1277

dbus_value = transform_func(type_func(value),

1278

variant_level

1279

=variant_level)

901

1280

self.PropertyChanged(dbus.String(dbus_name),

902

1281

dbus_value)

1282

setattr(self, attrname, value)

903

1283

904

return property(lambda self: real_value[0], setter)

905

1284

return property(lambda self: getattr(self, attrname), setter)

906

1285

907

1286

expires = notifychangeproperty(datetime_to_dbus, "Expires")

908

1287

approvals_pending = notifychangeproperty(dbus.Boolean,

912

1291

last_enabled = notifychangeproperty(datetime_to_dbus,

913

1292

"LastEnabled")

914

1293

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

915

type_func = lambda checker: checker is not None)

1294

type_func = lambda checker:

1295

checker is not None)

916

1296

last_checked_ok = notifychangeproperty(datetime_to_dbus,

917

1297

"LastCheckedOK")

918

last_approval_request = notifychangeproperty(datetime_to_dbus,

919

"LastApprovalRequest")

1298

last_checker_status = notifychangeproperty(dbus.Int16,

1299

"LastCheckerStatus")

1300

last_approval_request = notifychangeproperty(

1301

datetime_to_dbus, "LastApprovalRequest")

920

1302

approved_by_default = notifychangeproperty(dbus.Boolean,

921

1303

"ApprovedByDefault")

922

approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",

923

type_func = _timedelta_to_milliseconds)

924

approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",

925

type_func = _timedelta_to_milliseconds)

1304

approval_delay = notifychangeproperty(dbus.UInt64,

1305

"ApprovalDelay",

1306

type_func =

1307

timedelta_to_milliseconds)

1308

approval_duration = notifychangeproperty(

1309

dbus.UInt64, "ApprovalDuration",

1310

type_func = timedelta_to_milliseconds)

926

1311

host = notifychangeproperty(dbus.String, "Host")

927

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

928

type_func = _timedelta_to_milliseconds)

929

extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",

930

type_func = _timedelta_to_milliseconds)

931

interval = notifychangeproperty(dbus.UInt16, "Interval",

932

type_func = _timedelta_to_milliseconds)

1312

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

1313

type_func =

1314

timedelta_to_milliseconds)

1315

extended_timeout = notifychangeproperty(

1316

dbus.UInt64, "ExtendedTimeout",

1317

type_func = timedelta_to_milliseconds)

1318

interval = notifychangeproperty(dbus.UInt64,

1319

"Interval",

1320

type_func =

1321

timedelta_to_milliseconds)

933

1322

checker_command = notifychangeproperty(dbus.String, "Checker")

934

1323

935

1324

del notifychangeproperty

963

1352

*args, **kwargs)

964

1353

965

1354

def start_checker(self, *args, **kwargs):

966

old_checker = self.checker

967

if self.checker is not None:

968

old_checker_pid = self.checker.pid

969

else:

970

old_checker_pid = None

1355

old_checker_pid = getattr(self.checker, "pid", None)

971

1356

r = Client.start_checker(self, *args, **kwargs)

972

1357

# Only if new checker process was started

973

1358

if (self.checker is not None

977

1362

return r

978

1363

979

1364

def _reset_approved(self):

980

self._approved = None

1365

self.approved = None

981

1366

return False

982

1367

983

1368

def approve(self, value=True):

984

self.send_changedstate()

985

self._approved = value

986

gobject.timeout_add(_timedelta_to_milliseconds

1369

self.approved = value

1370

gobject.timeout_add(timedelta_to_milliseconds

987

1371

(self.approval_duration),

988

1372

self._reset_approved)

989

1373

self.send_changedstate()

990

1374

991

1375

## D-Bus methods, signals & properties

992

1376

_interface = "se.recompile.Mandos.Client"

993

1377

1378

## Interfaces

1379

1380

@dbus_interface_annotations(_interface)

1381

def _foo(self):

1382

return { "org.freedesktop.DBus.Property.EmitsChangedSignal":

1383

"false"}

1384

994

1385

## Signals

995

1386

996

1387

# CheckerCompleted - signal

1095

1486

access="readwrite")

1096

1487

def ApprovalDuration_dbus_property(self, value=None):

1097

1488

if value is None: # get

1098

return dbus.UInt64(_timedelta_to_milliseconds(

1489

return dbus.UInt64(timedelta_to_milliseconds(

1099

1490

self.approval_duration))

1100

1491

self.approval_duration = datetime.timedelta(0, 0, 0, value)

1101

1492

1115

1506

def Host_dbus_property(self, value=None):

1116

1507

if value is None: # get

1117

1508

return dbus.String(self.host)

1118

self.host = value

1509

self.host = unicode(value)

1119

1510

1120

1511

# Created - property

1121

1512

@dbus_service_property(_interface, signature="s", access="read")

1122

1513

def Created_dbus_property(self):

1123

return dbus.String(datetime_to_dbus(self.created))

1514

return datetime_to_dbus(self.created)

1124

1515

1125

1516

# LastEnabled - property

1126

1517

@dbus_service_property(_interface, signature="s", access="read")

1147

1538

return

1148

1539

return datetime_to_dbus(self.last_checked_ok)

1149

1540

1541

# LastCheckerStatus - property

1542

@dbus_service_property(_interface, signature="n",

1543

access="read")

1544

def LastCheckerStatus_dbus_property(self):

1545

return dbus.Int16(self.last_checker_status)

1546

1150

1547

# Expires - property

1151

1548

@dbus_service_property(_interface, signature="s", access="read")

1152

1549

def Expires_dbus_property(self):

1163

1560

def Timeout_dbus_property(self, value=None):

1164

1561

if value is None: # get

1165

1562

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1166

1564

self.timeout = datetime.timedelta(0, 0, 0, value)

1167

if getattr(self, "disable_initiator_tag", None) is None:

1168

return

1169

# Reschedule timeout

1170

gobject.source_remove(self.disable_initiator_tag)

1171

self.disable_initiator_tag = None

1172

self.expires = None

1173

time_to_die = (self.

1174

_timedelta_to_milliseconds((self

1175

.last_checked_ok

1176

+ self.timeout)

1177

- datetime.datetime

1178

.utcnow()))

1179

if time_to_die <= 0:

1180

# The timeout has passed

1181

self.disable()

1182

else:

1183

self.expires = (datetime.datetime.utcnow()

1184

+ datetime.timedelta(milliseconds = time_to_die))

1185

self.disable_initiator_tag = (gobject.timeout_add

1186

(time_to_die, self.disable))

1565

# Reschedule disabling

1566

if self.enabled:

1567

now = datetime.datetime.utcnow()

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1570

# The timeout has passed

1571

self.disable()

1572

else:

1573

if (getattr(self, "disable_initiator_tag", None)

1574

is None):

1575

return

1576

gobject.source_remove(self.disable_initiator_tag)

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1187

1581

1188

1582

# ExtendedTimeout - property

1189

1583

@dbus_service_property(_interface, signature="t",

1202

1596

self.interval = datetime.timedelta(0, 0, 0, value)

1203

1597

if getattr(self, "checker_initiator_tag", None) is None:

1204

1598

return

1205

# Reschedule checker run

1206

gobject.source_remove(self.checker_initiator_tag)

1207

self.checker_initiator_tag = (gobject.timeout_add

1208

(value, self.start_checker))

1209

self.start_checker() # Start one now, too

1599

if self.enabled:

1600

# Reschedule checker run

1601

gobject.source_remove(self.checker_initiator_tag)

1602

self.checker_initiator_tag = (gobject.timeout_add

1603

(value, self.start_checker))

1604

self.start_checker() # Start one now, too

1210

1605

1211

1606

# Checker - property

1212

1607

@dbus_service_property(_interface, signature="s",

1214

1609

def Checker_dbus_property(self, value=None):

1215

1610

if value is None: # get

1216

1611

return dbus.String(self.checker_command)

1217

self.checker_command = value

1612

self.checker_command = unicode(value)

1218

1613

1219

1614

# CheckerRunning - property

1220

1615

@dbus_service_property(_interface, signature="b",

1249

1644

raise KeyError()

1250

1645

1251

1646

def __getattribute__(self, name):

1252

if(name == '_pipe'):

1647

if name == '_pipe':

1253

1648

return super(ProxyClient, self).__getattribute__(name)

1254

1649

self._pipe.send(('getattr', name))

1255

1650

data = self._pipe.recv()

1262

1657

return func

1263

1658

1264

1659

def __setattr__(self, name, value):

1265

if(name == '_pipe'):

1660

if name == '_pipe':

1266

1661

return super(ProxyClient, self).__setattr__(name, value)

1267

1662

self._pipe.send(('setattr', name, value))

1268

1663

1269

class ClientDBusTransitional(ClientDBus):

1270

__metaclass__ = AlternateDBusNamesMetaclass

1271

1664

1272

1665

class ClientHandler(socketserver.BaseRequestHandler, object):

1273

1666

"""A class to handle client connections.

1310

1703

logger.debug("Protocol version: %r", line)

1311

1704

try:

1312

1705

if int(line.strip().split()[0]) > 1:

1313

raise RuntimeError

1706

raise RuntimeError(line)

1314

1707

except (ValueError, IndexError, RuntimeError) as error:

1315

1708

logger.error("Unknown protocol version: %s", error)

1316

1709

return

1353

1746

client.name)

1354

1747

if self.server.use_dbus:

1355

1748

# Emit D-Bus signal

1356

client.Rejected("Disabled")

1749

client.Rejected("Disabled")

1357

1750

return

1358

1751

1359

if client._approved or not client.approval_delay:

1752

if client.approved or not client.approval_delay:

1360

1753

#We are approved or approval is disabled

1361

1754

break

1362

elif client._approved is None:

1755

elif client.approved is None:

1363

1756

logger.info("Client %s needs approval",

1364

1757

client.name)

1365

1758

if self.server.use_dbus:

1376

1769

return

1377

1770

1378

1771

#wait until timeout or approved

1379

#x = float(client._timedelta_to_milliseconds(delay))

1380

1772

time = datetime.datetime.now()

1381

1773

client.changedstate.acquire()

1382

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1383

1777

client.changedstate.release()

1384

1778

time2 = datetime.datetime.now()

1385

1779

if (time2 - time) >= delay:

1401

1795

try:

1402

1796

sent = session.send(client.secret[sent_size:])

1403

1797

except gnutls.errors.GNUTLSError as error:

1404

logger.warning("gnutls send failed")

1798

logger.warning("gnutls send failed",

1799

exc_info=error)

1405

1800

return

1406

1801

logger.debug("Sent: %d, remaining: %d",

1407

1802

sent, len(client.secret)

1409

1804

sent_size += sent

1410

1805

1411

1806

logger.info("Sending secret to %s", client.name)

1412

# bump the timeout as if seen

1413

client.checked_ok(client.extended_timeout)

1807

# bump the timeout using extended_timeout

1808

client.bump_timeout(client.extended_timeout)

1414

1809

if self.server.use_dbus:

1415

1810

# Emit D-Bus signal

1416

1811

client.GotSecret()

1421

1816

try:

1422

1817

session.bye()

1423

1818

except gnutls.errors.GNUTLSError as error:

1424

logger.warning("GnuTLS bye failed")

1819

logger.warning("GnuTLS bye failed",

1820

exc_info=error)

1425

1821

1426

1822

@staticmethod

1427

1823

def peer_certificate(session):

1483

1879

# Convert the buffer to a Python bytestring

1484

1880

fpr = ctypes.string_at(buf, buf_len.value)

1485

1881

# Convert the bytestring to hexadecimal notation

1486

hex_fpr = ''.join("%02X" % ord(char) for char in fpr)

1882

hex_fpr = binascii.hexlify(fpr).upper()

1487

1883

return hex_fpr

1488

1884

1489

1885

1492

1888

def sub_process_main(self, request, address):

1493

1889

try:

1494

1890

self.finish_request(request, address)

1495

except:

1891

except Exception:

1496

1892

self.handle_error(request, address)

1497

1893

self.close_request(request)

1498

1894

1499

1895

def process_request(self, request, address):

1500

1896

"""Start a new process to process the request."""

1501

multiprocessing.Process(target = self.sub_process_main,

1502

args = (request, address)).start()

1897

proc = multiprocessing.Process(target = self.sub_process_main,

1898

args = (request, address))

1899

proc.start()

1900

return proc

1503

1901

1504

1902

1505

1903

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1511

1909

"""

1512

1910

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1513

1911

1514

super(MultiprocessingMixInWithPipe,

1515

self).process_request(request, client_address)

1912

proc = MultiprocessingMixIn.process_request(self, request,

1913

client_address)

1516

1914

self.child_pipe.close()

1517

self.add_pipe(parent_pipe)

1915

self.add_pipe(parent_pipe, proc)

1518

1916

1519

def add_pipe(self, parent_pipe):

1917

def add_pipe(self, parent_pipe, proc):

1520

1918

"""Dummy function; override as necessary"""

1521

raise NotImplementedError

1919

raise NotImplementedError()

1522

1920

1523

1921

1524

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1531

1929

use_ipv6: Boolean; to use IPv6 or not

1532

1930

"""

1533

1931

def __init__(self, server_address, RequestHandlerClass,

1534

interface=None, use_ipv6=True):

1932

interface=None, use_ipv6=True, socketfd=None):

1933

"""If socketfd is set, use that file descriptor instead of

1934

creating a new one with socket.socket().

1935

"""

1535

1936

self.interface = interface

1536

1937

if use_ipv6:

1537

1938

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

# To implement --socket, we monkey patch socket.socket.

1945

#

1946

# (When socketserver.TCPServer is a new-style class, we

1947

# could make self.socket into a property instead of monkey

1948

# patching socket.socket.)

1949

#

1950

# Create a one-time-only replacement for socket.socket()

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

# This time only, return a new socket object from the

1958

# saved file descriptor.

1959

return socket.fromfd(self.socketfd, *args, **kwargs)

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

# socket.socket(), which might be our replacement,

1964

# socket_wrapper(), if socketfd was set.

1538

1965

socketserver.TCPServer.__init__(self, server_address,

1539

1966

RequestHandlerClass)

1967

1540

1968

def server_bind(self):

1541

1969

"""This overrides the normal server_bind() function

1542

1970

to bind to an interface if one was specified, and also NOT to

1550

1978

try:

1551

1979

self.socket.setsockopt(socket.SOL_SOCKET,

1552

1980

SO_BINDTODEVICE,

1553

str(self.interface

1554

+ '\0'))

1981

str(self.interface + '\0'))

1555

1982

except socket.error as error:

1556

if error[0] == errno.EPERM:

1557

logger.error("No permission to"

1558

" bind to interface %s",

1559

self.interface)

1560

elif error[0] == errno.ENOPROTOOPT:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1561

1987

logger.error("SO_BINDTODEVICE not available;"

1562

1988

" cannot bind to interface %s",

1563

1989

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

logger.error("Interface %s does not exist,"

1992

" cannot bind", self.interface)

1564

1993

else:

1565

1994

raise

1566

1995

# Only bind(2) the socket if we really need to.

1569

1998

if self.address_family == socket.AF_INET6:

1570

1999

any_address = "::" # in6addr_any

1571

2000

else:

1572

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1573

2002

self.server_address = (any_address,

1574

2003

self.server_address[1])

1575

2004

elif not self.server_address[1]:

1596

2025

"""

1597

2026

def __init__(self, server_address, RequestHandlerClass,

1598

2027

interface=None, use_ipv6=True, clients=None,

1599

gnutls_priority=None, use_dbus=True):

2028

gnutls_priority=None, use_dbus=True, socketfd=None):

1600

2029

self.enabled = False

1601

2030

self.clients = clients

1602

2031

if self.clients is None:

1603

self.clients = set()

2032

self.clients = {}

1604

2033

self.use_dbus = use_dbus

1605

2034

self.gnutls_priority = gnutls_priority

1606

2035

IPv6_TCPServer.__init__(self, server_address,

1607

2036

RequestHandlerClass,

1608

2037

interface = interface,

1609

use_ipv6 = use_ipv6)

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1610

2040

def server_activate(self):

1611

2041

if self.enabled:

1612

2042

return socketserver.TCPServer.server_activate(self)

2043

1613

2044

def enable(self):

1614

2045

self.enabled = True

1615

def add_pipe(self, parent_pipe):

2046

2047

def add_pipe(self, parent_pipe, proc):

1616

2048

# Call "handle_ipc" for both data and EOF events

1617

2049

gobject.io_add_watch(parent_pipe.fileno(),

1618

2050

gobject.IO_IN | gobject.IO_HUP,

1619

2051

functools.partial(self.handle_ipc,

1620

parent_pipe = parent_pipe))

1621

2052

parent_pipe =

2053

parent_pipe,

2054

proc = proc))

2055

1622

2056

def handle_ipc(self, source, condition, parent_pipe=None,

1623

client_object=None):

1624

condition_names = {

1625

gobject.IO_IN: "IN", # There is data to read.

1626

gobject.IO_OUT: "OUT", # Data can be written (without

1627

# blocking).

1628

gobject.IO_PRI: "PRI", # There is urgent data to read.

1629

gobject.IO_ERR: "ERR", # Error condition.

1630

gobject.IO_HUP: "HUP" # Hung up (the connection has been

1631

# broken, usually for pipes and

1632

# sockets).

1633

}

1634

conditions_string = ' | '.join(name

1635

for cond, name in

1636

condition_names.iteritems()

1637

if cond & condition)

1638

# error or the other end of multiprocessing.Pipe has closed

1639

if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):

2057

proc = None, client_object=None):

2058

# error, or the other end of multiprocessing.Pipe has closed

2059

if condition & (gobject.IO_ERR | gobject.IO_HUP):

2060

# Wait for other process to exit

2061

proc.join()

1640

2062

return False

1641

2063

1642

2064

# Read a request from the child

1647

2069

fpr = request[1]

1648

2070

address = request[2]

1649

2071

1650

for c in self.clients:

2072

for c in self.clients.itervalues():

1651

2073

if c.fingerprint == fpr:

1652

2074

client = c

1653

2075

break

1656

2078

"dress: %s", fpr, address)

1657

2079

if self.use_dbus:

1658

2080

# Emit D-Bus signal

1659

mandos_dbus_service.ClientNotFound(fpr, address[0])

2081

mandos_dbus_service.ClientNotFound(fpr,

2082

address[0])

1660

2083

parent_pipe.send(False)

1661

2084

return False

1662

2085

1663

2086

gobject.io_add_watch(parent_pipe.fileno(),

1664

2087

gobject.IO_IN | gobject.IO_HUP,

1665

2088

functools.partial(self.handle_ipc,

1666

parent_pipe = parent_pipe,

1667

client_object = client))

2089

parent_pipe =

2090

parent_pipe,

2091

proc = proc,

2092

client_object =

2093

client))

1668

2094

parent_pipe.send(True)

1669

# remove the old hook in favor of the new above hook on same fileno

2095

# remove the old hook in favor of the new above hook on

2096

# same fileno

1670

2097

return False

1671

2098

if command == 'funcall':

1672

2099

funcname = request[1]

1673

2100

args = request[2]

1674

2101

kwargs = request[3]

1675

2102

1676

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

2103

parent_pipe.send(('data', getattr(client_object,

2104

funcname)(*args,

2105

**kwargs)))

1677

2106

1678

2107

if command == 'getattr':

1679

2108

attrname = request[1]

1680

2109

if callable(client_object.__getattribute__(attrname)):

1681

2110

parent_pipe.send(('function',))

1682

2111

else:

1683

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

2112

parent_pipe.send(('data', client_object

2113

.__getattribute__(attrname)))

1684

2114

1685

2115

if command == 'setattr':

1686

2116

attrname = request[1]

1690

2120

return True

1691

2121

1692

2122

2123

def rfc3339_duration_to_delta(duration):

2124

"""Parse an RFC 3339 "duration" and return a datetime.timedelta

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

# possible - there would have to be multiple places for the same

2144

# values, like seconds. The current code, while more esoteric, is

2145

# cleaner without depending on a parsing library. If Python had a

2146

# built-in library for parsing we would use it, but we'd like to

2147

# avoid excessive use of external libraries.

2148

2149

# New type for defining tokens, syntax, and semantics all-in-one

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

# RFC 3339 "duration" tokens, syntax, and semantics; taken from

2160

# the "duration" ABNF definition in RFC 3339, Appendix A.

2161

token_end = Token(re.compile(r"$"), None, frozenset())

2162

token_second = Token(re.compile(r"(\d+)S"),

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

token_minute = Token(re.compile(r"(\d+)M"),

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

token_hour = Token(re.compile(r"(\d+)H"),

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

token_time = Token(re.compile(r"T"),

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

token_day = Token(re.compile(r"(\d+)D"),

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

token_month = Token(re.compile(r"(\d+)M"),

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

token_year = Token(re.compile(r"(\d+)Y"),

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

token_week = Token(re.compile(r"(\d+)W"),

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

token_duration = Token(re.compile(r"P"), None,

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

factor = int(match.group(1), 10)

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

s = token.regexp.sub("", s, 1)

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

1693

2222

def string_to_delta(interval):

1694

2223

"""Parse a string and return a datetime.timedelta

1695

2224

1706

2235

>>> string_to_delta('5m 30s')

1707

2236

datetime.timedelta(0, 330)

1708

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

1709

2244

timevalue = datetime.timedelta(0)

1710

2245

for s in interval.split():

1711

2246

try:

1722

2257

elif suffix == "w":

1723

2258

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

1724

2259

else:

1725

raise ValueError("Unknown suffix %r" % suffix)

1726

except (ValueError, IndexError) as e:

2260

raise ValueError("Unknown suffix {0!r}"

2261

.format(suffix))

2262

except IndexError as e:

1727

2263

raise ValueError(*(e.args))

1728

2264

timevalue += delta

1729

2265

return timevalue

1730

2266

1731

2267

1732

def if_nametoindex(interface):

1733

"""Call the C function if_nametoindex(), or equivalent

1734

1735

Note: This function cannot accept a unicode string."""

1736

global if_nametoindex

1737

try:

1738

if_nametoindex = (ctypes.cdll.LoadLibrary

1739

(ctypes.util.find_library("c"))

1740

.if_nametoindex)

1741

except (OSError, AttributeError):

1742

logger.warning("Doing if_nametoindex the hard way")

1743

def if_nametoindex(interface):

1744

"Get an interface index the hard way, i.e. using fcntl()"

1745

SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

1746

with contextlib.closing(socket.socket()) as s:

1747

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1748

struct.pack(str("16s16x"),

1749

interface))

1750

interface_index = struct.unpack(str("I"),

1751

ifreq[16:20])[0]

1752

return interface_index

1753

return if_nametoindex(interface)

1754

1755

1756

2268

def daemon(nochdir = False, noclose = False):

1757

2269

"""See daemon(3). Standard BSD Unix function.

1758

2270

1766

2278

sys.exit()

1767

2279

if not noclose:

1768

2280

# Close all standard open file descriptors

1769

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2281

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

1770

2282

if not stat.S_ISCHR(os.fstat(null).st_mode):

1771

2283

raise OSError(errno.ENODEV,

1772

"%s not a character device"

1773

% os.path.devnull)

2284

"{0} not a character device"

2285

.format(os.devnull))

1774

2286

os.dup2(null, sys.stdin.fileno())

1775

2287

os.dup2(null, sys.stdout.fileno())

1776

2288

os.dup2(null, sys.stderr.fileno())

1785

2297

1786

2298

parser = argparse.ArgumentParser()

1787

2299

parser.add_argument("-v", "--version", action="version",

1788

version = "%%(prog)s %s" % version,

2300

version = "%(prog)s {0}".format(version),

1789

2301

help="show version number and exit")

1790

2302

parser.add_argument("-i", "--interface", metavar="IF",

1791

2303

help="Bind to interface IF")

1797

2309

help="Run self-test")

1798

2310

parser.add_argument("--debug", action="store_true",

1799

2311

help="Debug mode; run in foreground and log"

1800

" to terminal")

2312

" to terminal", default=None)

1801

2313

parser.add_argument("--debuglevel", metavar="LEVEL",

1802

2314

help="Debug level for stdout output")

1803

2315

parser.add_argument("--priority", help="GnuTLS"

1810

2322

" files")

1811

2323

parser.add_argument("--no-dbus", action="store_false",

1812

2324

dest="use_dbus", help="Do not provide D-Bus"

1813

" system bus interface")

2325

" system bus interface", default=None)

1814

2326

parser.add_argument("--no-ipv6", action="store_false",

1815

dest="use_ipv6", help="Do not use IPv6")

2327

dest="use_ipv6", help="Do not use IPv6",

2328

default=None)

2329

parser.add_argument("--no-restore", action="store_false",

2330

dest="restore", help="Do not restore stored"

2331

" state", default=None)

2332

parser.add_argument("--socket", type=int,

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2335

parser.add_argument("--statedir", metavar="DIR",

2336

help="Directory to save/restore state in")

2337

parser.add_argument("--foreground", action="store_true",

2338

help="Run in foreground", default=None)

2339

1816

2340

options = parser.parse_args()

1817

2341

1818

2342

if options.check:

1819

2343

import doctest

1820

doctest.testmod()

1821

sys.exit()

2344

fail_count, test_count = doctest.testmod()

2345

sys.exit(os.EX_OK if fail_count == 0 else 1)

1822

2346

1823

2347

# Default values for config file for server-global settings

1824

2348

server_defaults = { "interface": "",

1826

2350

"port": "",

1827

2351

"debug": "False",

1828

2352

"priority":

1829

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",

2353

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

1830

2354

"servicename": "Mandos",

1831

2355

"use_dbus": "True",

1832

2356

"use_ipv6": "True",

1833

2357

"debuglevel": "",

2358

"restore": "True",

2359

"socket": "",

2360

"statedir": "/var/lib/mandos",

2361

"foreground": "False",

1834

2362

}

1835

2363

1836

2364

# Parse config file for server-global settings

1841

2369

# Convert the SafeConfigParser object to a dict

1842

2370

server_settings = server_config.defaults()

1843

2371

# Use the appropriate methods on the non-string config options

1844

for option in ("debug", "use_dbus", "use_ipv6"):

2372

for option in ("debug", "use_dbus", "use_ipv6", "foreground"):

1845

2373

server_settings[option] = server_config.getboolean("DEFAULT",

1846

2374

option)

1847

2375

if server_settings["port"]:

1848

2376

server_settings["port"] = server_config.getint("DEFAULT",

1849

2377

"port")

2378

if server_settings["socket"]:

2379

server_settings["socket"] = server_config.getint("DEFAULT",

2380

"socket")

2381

# Later, stdin will, and stdout and stderr might, be dup'ed

2382

# over with an opened os.devnull. But we don't want this to

2383

# happen with a supplied network socket.

2384

if 0 <= server_settings["socket"] <= 2:

2385

server_settings["socket"] = os.dup(server_settings

2386

["socket"])

1850

2387

del server_config

1851

2388

1852

2389

# Override the settings from the config file with command line

1853

2390

# options, if set.

1854

2391

for option in ("interface", "address", "port", "debug",

1855

2392

"priority", "servicename", "configdir",

1856

"use_dbus", "use_ipv6", "debuglevel"):

2393

"use_dbus", "use_ipv6", "debuglevel", "restore",

2394

"statedir", "socket", "foreground"):

1857

2395

value = getattr(options, option)

1858

2396

if value is not None:

1859

2397

server_settings[option] = value

1862

2400

for option in server_settings.keys():

1863

2401

if type(server_settings[option]) is str:

1864

2402

server_settings[option] = unicode(server_settings[option])

2403

# Force all boolean options to be boolean

2404

for option in ("debug", "use_dbus", "use_ipv6", "restore",

2405

"foreground"):

2406

server_settings[option] = bool(server_settings[option])

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

1865

2410

# Now we have our good server settings in "server_settings"

1866

2411

1867

2412

##################################################################

1871

2416

debuglevel = server_settings["debuglevel"]

1872

2417

use_dbus = server_settings["use_dbus"]

1873

2418

use_ipv6 = server_settings["use_ipv6"]

2419

stored_state_path = os.path.join(server_settings["statedir"],

2420

stored_state_file)

2421

foreground = server_settings["foreground"]

2422

2423

if debug:

2424

initlogger(debug, logging.DEBUG)

2425

else:

2426

if not debuglevel:

2427

initlogger(debug)

2428

else:

2429

level = getattr(logging, debuglevel.upper())

2430

initlogger(debug, level)

1874

2431

1875

2432

if server_settings["servicename"] != "Mandos":

1876

2433

syslogger.setFormatter(logging.Formatter

1877

('Mandos (%s) [%%(process)d]:'

1878

' %%(levelname)s: %%(message)s'

1879

% server_settings["servicename"]))

2434

('Mandos ({0}) [%(process)d]:'

2435

' %(levelname)s: %(message)s'

2436

.format(server_settings

2437

["servicename"])))

1880

2438

1881

2439

# Parse config file with clients

1882

client_defaults = { "timeout": "5m",

1883

"extended_timeout": "15m",

1884

"interval": "2m",

1885

"checker": "fping -q -- %%(host)s",

1886

"host": "",

1887

"approval_delay": "0s",

1888

"approval_duration": "1s",

1889

}

1890

client_config = configparser.SafeConfigParser(client_defaults)

2440

client_config = configparser.SafeConfigParser(Client

2441

.client_defaults)

1891

2442

client_config.read(os.path.join(server_settings["configdir"],

1892

2443

"clients.conf"))

1893

2444

1902

2453

use_ipv6=use_ipv6,

1903

2454

gnutls_priority=

1904

2455

server_settings["priority"],

1905

use_dbus=use_dbus)

1906

if not debug:

1907

pidfilename = "/var/run/mandos.pid"

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

if not os.path.isdir("/run/."):

2462

pidfilename = "/var/run/mandos.pid"

2463

pidfile = None

1908

2464

try:

1909

2465

pidfile = open(pidfilename, "w")

1910

except IOError:

1911

logger.error("Could not open file %r", pidfilename)

2466

except IOError as e:

2467

logger.error("Could not open file %r", pidfilename,

2468

exc_info=e)

1912

2469

1913

try:

1914

uid = pwd.getpwnam("_mandos").pw_uid

1915

gid = pwd.getpwnam("_mandos").pw_gid

1916

except KeyError:

2470

for name in ("_mandos", "mandos", "nobody"):

1917

2471

try:

1918

uid = pwd.getpwnam("mandos").pw_uid

1919

gid = pwd.getpwnam("mandos").pw_gid

2472

uid = pwd.getpwnam(name).pw_uid

2473

gid = pwd.getpwnam(name).pw_gid

2474

break

1920

2475

except KeyError:

1921

try:

1922

uid = pwd.getpwnam("nobody").pw_uid

1923

gid = pwd.getpwnam("nobody").pw_gid

1924

except KeyError:

1925

uid = 65534

1926

gid = 65534

2476

continue

2477

else:

2478

uid = 65534

2479

gid = 65534

1927

2480

try:

1928

2481

os.setgid(gid)

1929

2482

os.setuid(uid)

1930

2483

except OSError as error:

1931

if error[0] != errno.EPERM:

1932

raise error

1933

1934

if not debug and not debuglevel:

1935

syslogger.setLevel(logging.WARNING)

1936

console.setLevel(logging.WARNING)

1937

if debuglevel:

1938

level = getattr(logging, debuglevel.upper())

1939

syslogger.setLevel(level)

1940

console.setLevel(level)

2484

if error.errno != errno.EPERM:

2485

raise

1941

2486

1942

2487

if debug:

1943

2488

# Enable all possible GnuTLS debugging

1954

2499

.gnutls_global_set_log_function(debug_gnutls))

1955

2500

1956

2501

# Redirect stdin so all checkers get /dev/null

1957

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2502

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

1958

2503

os.dup2(null, sys.stdin.fileno())

1959

2504

if null > 2:

1960

2505

os.close(null)

1961

else:

1962

# No console logging

1963

logger.removeHandler(console)

1964

2506

1965

2507

# Need to fork before connecting to D-Bus

1966

if not debug:

2508

if not foreground:

1967

2509

# Close all input and output, do double fork, etc.

1968

2510

daemon()

1969

2511

2512

# multiprocessing will use threads, so before we use gobject we

2513

# need to inform gobject that threads will be used.

2514

gobject.threads_init()

2515

1970

2516

global main_loop

1971

2517

# From the Avahi example code

1972

DBusGMainLoop(set_as_default=True )

2518

DBusGMainLoop(set_as_default=True)

1973

2519

main_loop = gobject.MainLoop()

1974

2520

bus = dbus.SystemBus()

1975

2521

# End of Avahi example code

1977

2523

try:

1978

2524

bus_name = dbus.service.BusName("se.recompile.Mandos",

1979

2525

bus, do_not_queue=True)

1980

old_bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",

1981

bus, do_not_queue=True)

2526

old_bus_name = (dbus.service.BusName

2527

("se.bsnet.fukt.Mandos", bus,

2528

do_not_queue=True))

1982

2529

except dbus.exceptions.NameExistsException as e:

1983

logger.error(unicode(e) + ", disabling D-Bus")

2530

logger.error("Disabling D-Bus:", exc_info=e)

1984

2531

use_dbus = False

1985

2532

server_settings["use_dbus"] = False

1986

2533

tcp_server.use_dbus = False

1987

2534

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1988

service = AvahiService(name = server_settings["servicename"],

1989

servicetype = "_mandos._tcp",

1990

protocol = protocol, bus = bus)

2535

service = AvahiServiceToSyslog(name =

2536

server_settings["servicename"],

2537

servicetype = "_mandos._tcp",

2538

protocol = protocol, bus = bus)

1991

2539

if server_settings["interface"]:

1992

2540

service.interface = (if_nametoindex

1993

2541

(str(server_settings["interface"])))

1997

2545

1998

2546

client_class = Client

1999

2547

if use_dbus:

2000

client_class = functools.partial(ClientDBusTransitional, bus = bus)

2001

def client_config_items(config, section):

2002

special_settings = {

2003

"approved_by_default":

2004

lambda: config.getboolean(section,

2005

"approved_by_default"),

2006

}

2007

for name, value in config.items(section):

2548

client_class = functools.partial(ClientDBus, bus = bus)

2549

2550

client_settings = Client.config_parser(client_config)

2551

old_client_settings = {}

2552

clients_data = {}

2553

2554

# This is used to redirect stdout and stderr for checker processes

2555

global wnull

2556

wnull = open(os.devnull, "w") # A writable /dev/null

2557

# Only used if server is running in foreground but not in debug

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2562

# Get client data and settings from last running state.

2563

if server_settings["restore"]:

2564

try:

2565

with open(stored_state_path, "rb") as stored_state:

2566

clients_data, old_client_settings = (pickle.load

2567

(stored_state))

2568

os.remove(stored_state_path)

2569

except IOError as e:

2570

if e.errno == errno.ENOENT:

2571

logger.warning("Could not load persistent state: {0}"

2572

.format(os.strerror(e.errno)))

2573

else:

2574

logger.critical("Could not load persistent state:",

2575

exc_info=e)

2576

raise

2577

except EOFError as e:

2578

logger.warning("Could not load persistent state: "

2579

"EOFError:", exc_info=e)

2580

2581

with PGPEngine() as pgp:

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2587

# Decide which value to use after restoring saved state.

2588

# We have three different values: Old config file,

2589

# new config file, and saved state.

2590

# New config value takes precedence if it differs from old

2591

# config value, otherwise use saved state.

2592

for name, value in client_settings[client_name].items():

2593

try:

2594

# For each value in new config, check if it

2595

# differs from the old config value (Except for

2596

# the "secret" attribute)

2597

if (name != "secret" and

2598

value != old_client_settings[client_name]

2599

[name]):

2600

client[name] = value

2601

except KeyError:

2602

pass

2603

2604

# Clients who has passed its expire date can still be

2605

# enabled if its last checker was successful. Clients

2606

# whose checker succeeded before we stored its state is

2607

# assumed to have successfully run all checkers during

2608

# downtime.

2609

if client["enabled"]:

2610

if datetime.datetime.utcnow() >= client["expires"]:

2611

if not client["last_checked_ok"]:

2612

logger.warning(

2613

"disabling client {0} - Client never "

2614

"performed a successful checker"

2615

.format(client_name))

2616

client["enabled"] = False

2617

elif client["last_checker_status"] != 0:

2618

logger.warning(

2619

"disabling client {0} - Client "

2620

"last checker failed with error code {1}"

2621

.format(client_name,

2622

client["last_checker_status"]))

2623

client["enabled"] = False

2624

else:

2625

client["expires"] = (datetime.datetime

2626

.utcnow()

2627

+ client["timeout"])

2628

logger.debug("Last checker succeeded,"

2629

" keeping {0} enabled"

2630

.format(client_name))

2008

2631

try:

2009

yield (name, special_settings[name]())

2010

except KeyError:

2011

yield (name, value)

2012

2013

tcp_server.clients.update(set(

2014

client_class(name = section,

2015

config= dict(client_config_items(

2016

client_config, section)))

2017

for section in client_config.sections()))

2632

client["secret"] = (

2633

pgp.decrypt(client["encrypted_secret"],

2634

client_settings[client_name]

2635

["secret"]))

2636

except PGPError:

2637

# If decryption fails, we use secret from new settings

2638

logger.debug("Failed to decrypt {0} old secret"

2639

.format(client_name))

2640

client["secret"] = (

2641

client_settings[client_name]["secret"])

2642

2643

# Add/remove clients based on new changes made to config

2644

for client_name in (set(old_client_settings)

2645

- set(client_settings)):

2646

del clients_data[client_name]

2647

for client_name in (set(client_settings)

2648

- set(old_client_settings)):

2649

clients_data[client_name] = client_settings[client_name]

2650

2651

# Create all client objects

2652

for client_name, client in clients_data.iteritems():

2653

tcp_server.clients[client_name] = client_class(

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2656

2018

2657

if not tcp_server.clients:

2019

2658

logger.warning("No clients defined")

2020

2021

if not debug:

2022

try:

2023

with pidfile:

2024

pid = os.getpid()

2025

pidfile.write(str(pid) + "\n".encode("utf-8"))

2026

del pidfile

2027

except IOError:

2028

logger.error("Could not write to file %r with PID %d",

2029

pidfilename, pid)

2030

except NameError:

2031

# "pidfile" was never created

2032

pass

2659

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

pidfile.write(str(pid) + "\n".encode("utf-8"))

2666

except IOError:

2667

logger.error("Could not write to file %r with PID %d",

2668

pidfilename, pid)

2669

del pidfile

2033

2670

del pidfilename

2034

2035

signal.signal(signal.SIGINT, signal.SIG_IGN)

2036

2671

2037

2672

signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())

2038

2673

signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())

2039

2674

2040

2675

if use_dbus:

2041

class MandosDBusService(dbus.service.Object):

2676

@alternate_dbus_interfaces({"se.recompile.Mandos":

2677

"se.bsnet.fukt.Mandos"})

2678

class MandosDBusService(DBusObjectWithProperties):

2042

2679

"""A D-Bus proxy object"""

2043

2680

def __init__(self):

2044

2681

dbus.service.Object.__init__(self, bus, "/")

2045

2682

_interface = "se.recompile.Mandos"

2046

2683

2684

@dbus_interface_annotations(_interface)

2685

def _foo(self):

2686

return { "org.freedesktop.DBus.Property"

2687

".EmitsChangedSignal":

2688

"false"}

2689

2047

2690

@dbus.service.signal(_interface, signature="o")

2048

2691

def ClientAdded(self, objpath):

2049

2692

"D-Bus signal"

2063

2706

def GetAllClients(self):

2064

2707

"D-Bus method"

2065

2708

return dbus.Array(c.dbus_object_path

2066

for c in tcp_server.clients)

2709

for c in

2710

tcp_server.clients.itervalues())

2067

2711

2068

2712

@dbus.service.method(_interface,

2069

2713

out_signature="a{oa{sv}}")

2071

2715

"D-Bus method"

2072

2716

return dbus.Dictionary(

2073

2717

((c.dbus_object_path, c.GetAll(""))

2074

for c in tcp_server.clients),

2718

for c in tcp_server.clients.itervalues()),

2075

2719

signature="oa{sv}")

2076

2720

2077

2721

@dbus.service.method(_interface, in_signature="o")

2078

2722

def RemoveClient(self, object_path):

2079

2723

"D-Bus method"

2080

for c in tcp_server.clients:

2724

for c in tcp_server.clients.itervalues():

2081

2725

if c.dbus_object_path == object_path:

2082

tcp_server.clients.remove(c)

2726

del tcp_server.clients[c.name]

2083

2727

c.remove_from_connection()

2084

2728

# Don't signal anything except ClientRemoved

2085

2729

c.disable(quiet=True)

2090

2734

2091

2735

del _interface

2092

2736

2093

class MandosDBusServiceTransitional(MandosDBusService):

2094

__metaclass__ = AlternateDBusNamesMetaclass

2095

mandos_dbus_service = MandosDBusServiceTransitional()

2737

mandos_dbus_service = MandosDBusService()

2096

2738

2097

2739

def cleanup():

2098

2740

"Cleanup function; run on exit"

2099

2741

service.cleanup()

2100

2742

2743

multiprocessing.active_children()

2744

wnull.close()

2745

if not (tcp_server.clients or client_settings):

2746

return

2747

2748

# Store client before exiting. Secrets are encrypted with key

2749

# based on what config file has. If config file is

2750

# removed/edited, old secret will thus be unrecovable.

2751

clients = {}

2752

with PGPEngine() as pgp:

2753

for client in tcp_server.clients.itervalues():

2754

key = client_settings[client.name]["secret"]

2755

client.encrypted_secret = pgp.encrypt(client.secret,

2756

key)

2757

client_dict = {}

2758

2759

# A list of attributes that can not be pickled

2760

# + secret.

2761

exclude = set(("bus", "changedstate", "secret",

2762

"checker", "server_settings"))

2763

for name, typ in (inspect.getmembers

2764

(dbus.service.Object)):

2765

exclude.add(name)

2766

2767

client_dict["encrypted_secret"] = (client

2768

.encrypted_secret)

2769

for attr in client.client_structure:

2770

if attr not in exclude:

2771

client_dict[attr] = getattr(client, attr)

2772

2773

clients[client.name] = client_dict

2774

del client_settings[client.name]["secret"]

2775

2776

try:

2777

with (tempfile.NamedTemporaryFile

2778

(mode='wb', suffix=".pickle", prefix='clients-',

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2781

pickle.dump((clients, client_settings), stored_state)

2782

tempname=stored_state.name

2783

os.rename(tempname, stored_state_path)

2784

except (IOError, OSError) as e:

2785

if not debug:

2786

try:

2787

os.remove(tempname)

2788

except NameError:

2789

pass

2790

if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):

2791

logger.warning("Could not save persistent state: {0}"

2792

.format(os.strerror(e.errno)))

2793

else:

2794

logger.warning("Could not save persistent state:",

2795

exc_info=e)

2796

raise

2797

2798

# Delete all clients, and settings from config

2101

2799

while tcp_server.clients:

2102

client = tcp_server.clients.pop()

2800

name, client = tcp_server.clients.popitem()

2103

2801

if use_dbus:

2104

2802

client.remove_from_connection()

2105

client.disable_hook = None

2106

2803

# Don't signal anything except ClientRemoved

2107

2804

client.disable(quiet=True)

2108

2805

if use_dbus:

2109

2806

# Emit D-Bus signal

2110

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2807

mandos_dbus_service.ClientRemoved(client

2808

.dbus_object_path,

2111

2809

client.name)

2810

client_settings.clear()

2112

2811

2113

2812

atexit.register(cleanup)

2114

2813

2115

for client in tcp_server.clients:

2814

for client in tcp_server.clients.itervalues():

2116

2815

if use_dbus:

2117

2816

# Emit D-Bus signal

2118

2817

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2119

client.enable()

2818

# Need to initiate checking of clients

2819

if client.enabled:

2820

client.init_checker()

2120

2821

2121

2822

tcp_server.enable()

2122

2823

tcp_server.server_activate()

2125

2826

service.port = tcp_server.socket.getsockname()[1]

2126

2827

if use_ipv6:

2127

2828

logger.info("Now listening on address %r, port %d,"

2128

" flowinfo %d, scope_id %d"

2129

% tcp_server.socket.getsockname())

2829

" flowinfo %d, scope_id %d",

2830

*tcp_server.socket.getsockname())

2130

2831

else: # IPv4

2131

logger.info("Now listening on address %r, port %d"

2132

% tcp_server.socket.getsockname())

2832

logger.info("Now listening on address %r, port %d",

2833

*tcp_server.socket.getsockname())

2133

2834

2134

2835

#service.interface = tcp_server.socket.getsockname()[3]

2135

2836

2138

2839

try:

2139

2840

service.activate()

2140

2841

except dbus.exceptions.DBusException as error:

2141

logger.critical("DBusException: %s", error)

2842

logger.critical("D-Bus Exception", exc_info=error)

2142

2843

cleanup()

2143

2844

sys.exit(1)

2144

2845

# End of Avahi example code

2151

2852

logger.debug("Starting main loop")

2152

2853

main_loop.run()

2153

2854

except AvahiError as error:

2154

logger.critical("AvahiError: %s", error)

2855

logger.critical("Avahi Error", exc_info=error)

2155

2856

cleanup()

2156

2857

sys.exit(1)

2157

2858

except KeyboardInterrupt:

2162

2863

# Must run before the D-Bus bus name gets deregistered

2163

2864

cleanup()

2164

2865

2165

2166

2866

if __name__ == '__main__':

2167

2867

main()