/mandos/trunk : revision 636

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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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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 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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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.3"

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version = "1.6.2"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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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.gnupg = GnuPGInterface.GnuPG()

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

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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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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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 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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return b"mandos" + binascii.hexlify(password)

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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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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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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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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self.value = value

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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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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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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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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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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)

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

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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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.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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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": "5m",

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"extended_timeout": "15m",

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"interval": "2m",

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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": "0s",

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"approval_duration": "1s",

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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 approval_delay_milliseconds(self):

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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["last_checker_status"] = -2

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return settings

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

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

611

if not quiet:

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self.send_changedstate()

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

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return False

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619

def init_checker(self):

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

601

621

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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631

(self.timeout_milliseconds(),

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self.disable))

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timeout = self.timeout

640

664

if self.disable_initiator_tag is not None:

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665

gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

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667

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

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668

self.disable_initiator_tag = (gobject.timeout_add

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669

(timedelta_to_milliseconds

654

679

If a checker already exists, leave it running and do

655

680

nothing."""

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

657

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

658

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

659

# client would inevitably timeout, since no checker would get

660

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

661

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

662

687

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

663

688

# should be.

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702

self.current_checker_command)

678

703

# Start a new checker if needed

679

704

if self.checker is None:

705

# Escape attributes for the shell

706

escaped_attrs = dict(

707

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

708

for attr in

709

self.runtime_expansions)

680

710

try:

681

# In case checker_command has exactly one % operator

682

command = self.checker_command % self.host

683

except TypeError:

684

# Escape attributes for the shell

685

escaped_attrs = dict(

686

(attr,

687

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

688

errors=

689

'replace')))

690

for attr in

691

self.runtime_expansions)

692

693

try:

694

command = self.checker_command % escaped_attrs

695

except TypeError as error:

696

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

697

self.checker_command, exc_info=error)

698

return True # Try again later

711

command = self.checker_command % escaped_attrs

712

except TypeError as error:

713

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

714

self.checker_command, exc_info=error)

715

return True # Try again later

699

716

self.current_checker_command = command

700

717

try:

701

718

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

704

721

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

705

722

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

706

723

# always replaced by /dev/null.)

724

# The exception is when not debugging but nevertheless

725

# running in the foreground; use the previously

726

# created wnull.

727

popen_args = {}

728

if (not self.server_settings["debug"]

729

and self.server_settings["foreground"]):

730

popen_args.update({"stdout": wnull,

731

"stderr": wnull })

707

732

self.checker = subprocess.Popen(command,

708

733

close_fds=True,

709

shell=True, cwd="/")

710

self.checker_callback_tag = (gobject.child_watch_add

711

(self.checker.pid,

712

self.checker_callback,

713

data=command))

714

# The checker may have completed before the gobject

715

# watch was added. Check for this.

716

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

717

if pid:

718

gobject.source_remove(self.checker_callback_tag)

719

self.checker_callback(pid, status, command)

734

shell=True, cwd="/",

735

**popen_args)

720

736

except OSError as error:

721

737

logger.error("Failed to start subprocess",

722

738

exc_info=error)

739

return True

740

self.checker_callback_tag = (gobject.child_watch_add

741

(self.checker.pid,

742

self.checker_callback,

743

data=command))

744

# The checker may have completed before the gobject

745

# watch was added. Check for this.

746

try:

747

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

748

except OSError as error:

749

if error.errno == errno.ECHILD:

750

# This should never happen

751

logger.error("Child process vanished",

752

exc_info=error)

753

return True

754

raise

755

if pid:

756

gobject.source_remove(self.checker_callback_tag)

757

self.checker_callback(pid, status, command)

723

758

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

724

759

return True

725

760

773

808

774

809

775

810

def dbus_interface_annotations(dbus_interface):

776

"""Decorator for marking functions returning interface annotations.

811

"""Decorator for marking functions returning interface annotations

777

812

778

813

Usage:

779

814

976

1011

tag.appendChild(ann_tag)

977

1012

# Add interface annotation tags

978

1013

for annotation, value in dict(

979

itertools.chain(

980

*(annotations().iteritems()

981

for name, annotations in

982

self._get_all_dbus_things("interface")

983

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

984

))).iteritems():

1014

itertools.chain.from_iterable(

1015

annotations().iteritems()

1016

for name, annotations in

1017

self._get_all_dbus_things("interface")

1018

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

1019

)).iteritems():

985

1020

ann_tag = document.createElement("annotation")

986

1021

ann_tag.setAttribute("name", annotation)

987

1022

ann_tag.setAttribute("value", value)

1010

1045

return xmlstring

1011

1046

1012

1047

1013

def datetime_to_dbus (dt, variant_level=0):

1048

def datetime_to_dbus(dt, variant_level=0):

1014

1049

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

1015

1050

if dt is None:

1016

1051

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

1018

1053

variant_level=variant_level)

1019

1054

1020

1055

1021

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

1022

.__metaclass__):

1023

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

1024

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

1056

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1057

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

1058

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

1059

interface names according to the "alt_interface_names" mapping.

1060

Usage:

1061

1062

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

1063

"net.example.AlternateInterface"})

1064

class SampleDBusObject(dbus.service.Object):

1065

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

1066

def SampleDBusMethod():

1067

pass

1068

1069

The above "SampleDBusMethod" on "SampleDBusObject" will be

1070

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

1071

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

1072

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

1073

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

1074

1075

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

1076

(from DBusObjectWithProperties) and interfaces (from the

1077

dbus_interface_annotations decorator).

1025

1078

"""

1026

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

1027

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

1028

# methods, signals, or properties in them

1029

old_interface_names = []

1030

for base in (b for b in bases

1031

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

1032

# Go though all attributes of the base class

1033

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

1079

def wrapper(cls):

1080

for orig_interface_name, alt_interface_name in (

1081

alt_interface_names.iteritems()):

1082

attr = {}

1083

interface_names = set()

1084

# Go though all attributes of the class

1085

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

1034

1086

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

1035

1087

# with the wrong interface name

1036

1088

if (not hasattr(attribute, "_dbus_interface")

1037

1089

or not attribute._dbus_interface

1038

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

1090

.startswith(orig_interface_name)):

1039

1091

continue

1040

1092

# Create an alternate D-Bus interface name based on

1041

1093

# the current name

1042

1094

alt_interface = (attribute._dbus_interface

1043

.replace("se.recompile.Mandos",

1044

"se.bsnet.fukt.Mandos"))

1045

if alt_interface != attribute._dbus_interface:

1046

old_interface_names.append(alt_interface)

1095

.replace(orig_interface_name,

1096

alt_interface_name))

1097

interface_names.add(alt_interface)

1047

1098

# Is this a D-Bus signal?

1048

1099

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

1049

# Extract the original non-method function by

1050

# black magic

1100

# Extract the original non-method undecorated

1101

# function by black magic

1051

1102

nonmethod_func = (dict(

1052

1103

zip(attribute.func_code.co_freevars,

1053

1104

attribute.__closure__))["func"]

1071

1122

except AttributeError:

1072

1123

pass

1073

1124

# Define a creator of a function to call both the

1074

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

1075

# signals gets sent when the function is called

1125

# original and alternate functions, so both the

1126

# original and alternate signals gets sent when

1127

# the function is called

1076

1128

def fixscope(func1, func2):

1077

1129

"""This function is a scope container to pass

1078

1130

func1 and func2 to the "call_both" function

1085

1137

return call_both

1086

1138

# Create the "call_both" function and add it to

1087

1139

# the class

1088

attr[attrname] = fixscope(attribute,

1089

new_function)

1140

attr[attrname] = fixscope(attribute, new_function)

1090

1141

# Is this a D-Bus method?

1091

1142

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

1092

1143

# Create a new, but exactly alike, function

1148

1199

attribute.func_name,

1149

1200

attribute.func_defaults,

1150

1201

attribute.func_closure)))

1151

# Deprecate all old interfaces

1152

basename="_AlternateDBusNamesMetaclass_interface_annotation{0}"

1153

for old_interface_name in old_interface_names:

1154

@dbus_interface_annotations(old_interface_name)

1155

def func(self):

1156

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

1157

# Find an unused name

1158

for aname in (basename.format(i) for i in

1159

itertools.count()):

1160

if aname not in attr:

1161

attr[aname] = func

1162

break

1163

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

1164

1165

1202

if deprecate:

1203

# Deprecate all alternate interfaces

1204

iname="_AlternateDBusNames_interface_annotation{0}"

1205

for interface_name in interface_names:

1206

@dbus_interface_annotations(interface_name)

1207

def func(self):

1208

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

1209

"true" }

1210

# Find an unused name

1211

for aname in (iname.format(i)

1212

for i in itertools.count()):

1213

if aname not in attr:

1214

attr[aname] = func

1215

break

1216

if interface_names:

1217

# Replace the class with a new subclass of it with

1218

# methods, signals, etc. as created above.

1219

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

1220

(cls,), attr)

1221

return cls

1222

return wrapper

1223

1224

1225

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

1226

"se.bsnet.fukt.Mandos"})

1166

1227

class ClientDBus(Client, DBusObjectWithProperties):

1167

1228

"""A Client class using D-Bus

1168

1229

1188

1249

("/clients/" + client_object_name))

1189

1250

DBusObjectWithProperties.__init__(self, self.bus,

1190

1251

self.dbus_object_path)

1191

1252

1192

1253

def notifychangeproperty(transform_func,

1193

1254

dbus_name, type_func=lambda x: x,

1194

1255

variant_level=1):

1217

1278

1218

1279

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

1219

1280

1220

1221

1281

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1222

1282

approvals_pending = notifychangeproperty(dbus.Boolean,

1223

1283

"ApprovalPending",

1305

1365

return False

1306

1366

1307

1367

def approve(self, value=True):

1308

self.send_changedstate()

1309

1368

self.approved = value

1310

1369

gobject.timeout_add(timedelta_to_milliseconds

1311

1370

(self.approval_duration),

1312

1371

self._reset_approved)

1313

1372

self.send_changedstate()

1314

1373

1315

1374

## D-Bus methods, signals & properties

1316

1375

_interface = "se.recompile.Mandos.Client"

1500

1559

def Timeout_dbus_property(self, value=None):

1501

1560

if value is None: # get

1502

1561

return dbus.UInt64(self.timeout_milliseconds())

1562

old_timeout = self.timeout

1503

1563

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

1504

# Reschedule timeout

1564

# Reschedule disabling

1505

1565

if self.enabled:

1506

1566

now = datetime.datetime.utcnow()

1507

time_to_die = timedelta_to_milliseconds(

1508

(self.last_checked_ok + self.timeout) - now)

1509

if time_to_die <= 0:

1567

self.expires += self.timeout - old_timeout

1568

if self.expires <= now:

1510

1569

# The timeout has passed

1511

1570

self.disable()

1512

1571

else:

1513

self.expires = (now +

1514

datetime.timedelta(milliseconds =

1515

time_to_die))

1516

1572

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

1517

1573

is None):

1518

1574

return

1519

1575

gobject.source_remove(self.disable_initiator_tag)

1520

self.disable_initiator_tag = (gobject.timeout_add

1521

(time_to_die,

1522

self.disable))

1576

self.disable_initiator_tag = (

1577

gobject.timeout_add(

1578

timedelta_to_milliseconds(self.expires - now),

1579

self.disable))

1523

1580

1524

1581

# ExtendedTimeout - property

1525

1582

@dbus_service_property(_interface, signature="t",

1604

1661

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

1605

1662

1606

1663

1607

class ClientDBusTransitional(ClientDBus):

1608

__metaclass__ = AlternateDBusNamesMetaclass

1609

1610

1611

1664

class ClientHandler(socketserver.BaseRequestHandler, object):

1612

1665

"""A class to handle client connections.

1613

1666

1717

1770

#wait until timeout or approved

1718

1771

time = datetime.datetime.now()

1719

1772

client.changedstate.acquire()

1720

(client.changedstate.wait

1721

(float(client.timedelta_to_milliseconds(delay)

1722

/ 1000)))

1773

client.changedstate.wait(

1774

float(timedelta_to_milliseconds(delay)

1775

/ 1000))

1723

1776

client.changedstate.release()

1724

1777

time2 = datetime.datetime.now()

1725

1778

if (time2 - time) >= delay:

1741

1794

try:

1742

1795

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

1743

1796

except gnutls.errors.GNUTLSError as error:

1744

logger.warning("gnutls send failed")

1797

logger.warning("gnutls send failed",

1798

exc_info=error)

1745

1799

return

1746

1800

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

1747

1801

sent, len(client.secret)

1761

1815

try:

1762

1816

session.bye()

1763

1817

except gnutls.errors.GNUTLSError as error:

1764

logger.warning("GnuTLS bye failed")

1818

logger.warning("GnuTLS bye failed",

1819

exc_info=error)

1765

1820

1766

1821

@staticmethod

1767

1822

def peer_certificate(session):

1839

1894

def process_request(self, request, address):

1840

1895

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

1841

1896

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

1842

args = (request,

1843

address))

1897

args = (request, address))

1844

1898

proc.start()

1845

1899

return proc

1846

1900

1874

1928

use_ipv6: Boolean; to use IPv6 or not

1875

1929

"""

1876

1930

def __init__(self, server_address, RequestHandlerClass,

1877

interface=None, use_ipv6=True):

1931

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

1932

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

1933

creating a new one with socket.socket().

1934

"""

1878

1935

self.interface = interface

1879

1936

if use_ipv6:

1880

1937

self.address_family = socket.AF_INET6

1938

if socketfd is not None:

1939

# Save the file descriptor

1940

self.socketfd = socketfd

1941

# Save the original socket.socket() function

1942

self.socket_socket = socket.socket

1943

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

1944

#

1945

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

1946

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

1947

# patching socket.socket.)

1948

#

1949

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

1950

@functools.wraps(socket.socket)

1951

def socket_wrapper(*args, **kwargs):

1952

# Restore original function so subsequent calls are

1953

# not affected.

1954

socket.socket = self.socket_socket

1955

del self.socket_socket

1956

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

1957

# saved file descriptor.

1958

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

1959

# Replace socket.socket() function with wrapper

1960

socket.socket = socket_wrapper

1961

# The socketserver.TCPServer.__init__ will call

1962

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

1963

# socket_wrapper(), if socketfd was set.

1881

1964

socketserver.TCPServer.__init__(self, server_address,

1882

1965

RequestHandlerClass)

1966

1883

1967

def server_bind(self):

1884

1968

"""This overrides the normal server_bind() function

1885

1969

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

1893

1977

try:

1894

1978

self.socket.setsockopt(socket.SOL_SOCKET,

1895

1979

SO_BINDTODEVICE,

1896

str(self.interface

1897

+ '\0'))

1980

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

1898

1981

except socket.error as error:

1899

if error[0] == errno.EPERM:

1900

logger.error("No permission to"

1901

" bind to interface %s",

1902

self.interface)

1903

elif error[0] == errno.ENOPROTOOPT:

1982

if error.errno == errno.EPERM:

1983

logger.error("No permission to bind to"

1984

" interface %s", self.interface)

1985

elif error.errno == errno.ENOPROTOOPT:

1904

1986

logger.error("SO_BINDTODEVICE not available;"

1905

1987

" cannot bind to interface %s",

1906

1988

self.interface)

1989

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1907

1992

else:

1908

1993

raise

1909

1994

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

1912

1997

if self.address_family == socket.AF_INET6:

1913

1998

any_address = "::" # in6addr_any

1914

1999

else:

1915

any_address = socket.INADDR_ANY

2000

any_address = "0.0.0.0" # INADDR_ANY

1916

2001

self.server_address = (any_address,

1917

2002

self.server_address[1])

1918

2003

elif not self.server_address[1]:

1939

2024

"""

1940

2025

def __init__(self, server_address, RequestHandlerClass,

1941

2026

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

1942

gnutls_priority=None, use_dbus=True):

2027

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

1943

2028

self.enabled = False

1944

2029

self.clients = clients

1945

2030

if self.clients is None:

1949

2034

IPv6_TCPServer.__init__(self, server_address,

1950

2035

RequestHandlerClass,

1951

2036

interface = interface,

1952

use_ipv6 = use_ipv6)

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1953

2039

def server_activate(self):

1954

2040

if self.enabled:

1955

2041

return socketserver.TCPServer.server_activate(self)

1968

2054

1969

2055

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

1970

2056

proc = None, client_object=None):

1971

condition_names = {

1972

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

1973

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

1974

# blocking).

1975

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

1976

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

1977

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

1978

# broken, usually for pipes and

1979

# sockets).

1980

}

1981

conditions_string = ' | '.join(name

1982

for cond, name in

1983

condition_names.iteritems()

1984

if cond & condition)

1985

2057

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

1986

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

2058

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

1987

2059

# Wait for other process to exit

1988

2060

proc.join()

1989

2061

return False

2047

2119

return True

2048

2120

2049

2121

2122

def rfc3339_duration_to_delta(duration):

2123

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

2124

2125

>>> rfc3339_duration_to_delta("P7D")

2126

datetime.timedelta(7)

2127

>>> rfc3339_duration_to_delta("PT60S")

2128

datetime.timedelta(0, 60)

2129

>>> rfc3339_duration_to_delta("PT60M")

2130

datetime.timedelta(0, 3600)

2131

>>> rfc3339_duration_to_delta("PT24H")

2132

datetime.timedelta(1)

2133

>>> rfc3339_duration_to_delta("P1W")

2134

datetime.timedelta(7)

2135

>>> rfc3339_duration_to_delta("PT5M30S")

2136

datetime.timedelta(0, 330)

2137

>>> rfc3339_duration_to_delta("P1DT3M20S")

2138

datetime.timedelta(1, 200)

2139

"""

2140

2141

# Parsing an RFC 3339 duration with regular expressions is not

2142

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

2143

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

2144

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

2145

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

2146

# avoid excessive use of external libraries.

2147

2148

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

2149

Token = collections.namedtuple("Token",

2150

("regexp", # To match token; if

2151

# "value" is not None,

2152

# must have a "group"

2153

# containing digits

2154

"value", # datetime.timedelta or

2155

# None

2156

"followers")) # Tokens valid after

2157

# this token

2158

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

2159

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

2160

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

2161

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

2162

datetime.timedelta(seconds=1),

2163

frozenset((token_end,)))

2164

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

2165

datetime.timedelta(minutes=1),

2166

frozenset((token_second, token_end)))

2167

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

2168

datetime.timedelta(hours=1),

2169

frozenset((token_minute, token_end)))

2170

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

2171

None,

2172

frozenset((token_hour, token_minute,

2173

token_second)))

2174

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

2175

datetime.timedelta(days=1),

2176

frozenset((token_time, token_end)))

2177

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

2178

datetime.timedelta(weeks=4),

2179

frozenset((token_day, token_end)))

2180

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

2181

datetime.timedelta(weeks=52),

2182

frozenset((token_month, token_end)))

2183

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

2184

datetime.timedelta(weeks=1),

2185

frozenset((token_end,)))

2186

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

2187

frozenset((token_year, token_month,

2188

token_day, token_time,

2189

token_week))),

2190

# Define starting values

2191

value = datetime.timedelta() # Value so far

2192

found_token = None

2193

followers = frozenset(token_duration,) # Following valid tokens

2194

s = duration # String left to parse

2195

# Loop until end token is found

2196

while found_token is not token_end:

2197

# Search for any currently valid tokens

2198

for token in followers:

2199

match = token.regexp.match(s)

2200

if match is not None:

2201

# Token found

2202

if token.value is not None:

2203

# Value found, parse digits

2204

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

2205

# Add to value so far

2206

value += factor * token.value

2207

# Strip token from string

2208

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

2209

# Go to found token

2210

found_token = token

2211

# Set valid next tokens

2212

followers = found_token.followers

2213

break

2214

else:

2215

# No currently valid tokens were found

2216

raise ValueError("Invalid RFC 3339 duration")

2217

# End token found

2218

return value

2219

2220

2050

2221

def string_to_delta(interval):

2051

2222

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

2052

2223

2063

2234

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

2064

2235

datetime.timedelta(0, 330)

2065

2236

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

2066

2243

timevalue = datetime.timedelta(0)

2067

2244

for s in interval.split():

2068

2245

try:

2131

2308

help="Run self-test")

2132

2309

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

2133

2310

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

2134

" to terminal")

2311

" to terminal", default=None)

2135

2312

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

2136

2313

help="Debug level for stdout output")

2137

2314

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

2144

2321

" files")

2145

2322

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

2146

2323

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

2147

" system bus interface")

2324

" system bus interface", default=None)

2148

2325

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

2149

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

2326

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

2327

default=None)

2150

2328

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

2151

2329

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

2152

" state")

2330

" state", default=None)

2331

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

2332

help="Specify a file descriptor to a network"

2333

" socket to use instead of creating one")

2153

2334

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

2154

2335

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

2336

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

2337

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

2155

2338

2156

2339

options = parser.parse_args()

2157

2340

2166

2349

"port": "",

2167

2350

"debug": "False",

2168

2351

"priority":

2169

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

2352

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

2170

2353

"servicename": "Mandos",

2171

2354

"use_dbus": "True",

2172

2355

"use_ipv6": "True",

2173

2356

"debuglevel": "",

2174

2357

"restore": "True",

2175

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

2358

"socket": "",

2359

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

2360

"foreground": "False",

2176

2361

}

2177

2362

2178

2363

# Parse config file for server-global settings

2183

2368

# Convert the SafeConfigParser object to a dict

2184

2369

server_settings = server_config.defaults()

2185

2370

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

2186

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

2371

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

2187

2372

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

2188

2373

option)

2189

2374

if server_settings["port"]:

2190

2375

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

2191

2376

"port")

2377

if server_settings["socket"]:

2378

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

2379

"socket")

2380

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

2381

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

2382

# happen with a supplied network socket.

2383

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

2384

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

2385

["socket"])

2192

2386

del server_config

2193

2387

2194

2388

# Override the settings from the config file with command line

2196

2390

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

2197

2391

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

2198

2392

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

2199

"statedir"):

2393

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

2200

2394

value = getattr(options, option)

2201

2395

if value is not None:

2202

2396

server_settings[option] = value

2205

2399

for option in server_settings.keys():

2206

2400

if type(server_settings[option]) is str:

2207

2401

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

2402

# Force all boolean options to be boolean

2403

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

2404

"foreground"):

2405

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

2406

# Debug implies foreground

2407

if server_settings["debug"]:

2408

server_settings["foreground"] = True

2208

2409

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

2209

2410

2210

2411

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

2216

2417

use_ipv6 = server_settings["use_ipv6"]

2217

2418

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

2218

2419

stored_state_file)

2420

foreground = server_settings["foreground"]

2219

2421

2220

2422

if debug:

2221

2423

initlogger(debug, logging.DEBUG)

2250

2452

use_ipv6=use_ipv6,

2251

2453

gnutls_priority=

2252

2454

server_settings["priority"],

2253

use_dbus=use_dbus)

2254

if not debug:

2255

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

2455

use_dbus=use_dbus,

2456

socketfd=(server_settings["socket"]

2457

or None))

2458

if not foreground:

2459

pidfilename = "/run/mandos.pid"

2460

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

2461

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

2462

pidfile = None

2256

2463

try:

2257

2464

pidfile = open(pidfilename, "w")

2258

except IOError:

2259

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

2465

except IOError as e:

2466

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

2467

exc_info=e)

2260

2468

2261

2469

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

2262

2470

try:

2272

2480

os.setgid(gid)

2273

2481

os.setuid(uid)

2274

2482

except OSError as error:

2275

if error[0] != errno.EPERM:

2483

if error.errno != errno.EPERM:

2276

2484

raise error

2277

2485

2278

2486

if debug:

2296

2504

os.close(null)

2297

2505

2298

2506

# Need to fork before connecting to D-Bus

2299

if not debug:

2507

if not foreground:

2300

2508

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

2301

2509

daemon()

2302

2510

2511

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

2512

# need to inform gobject that threads will be used.

2303

2513

gobject.threads_init()

2304

2514

2305

2515

global main_loop

2316

2526

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

2317

2527

do_not_queue=True))

2318

2528

except dbus.exceptions.NameExistsException as e:

2319

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

2529

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

2320

2530

use_dbus = False

2321

2531

server_settings["use_dbus"] = False

2322

2532

tcp_server.use_dbus = False

2334

2544

2335

2545

client_class = Client

2336

2546

if use_dbus:

2337

client_class = functools.partial(ClientDBusTransitional,

2338

bus = bus)

2547

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

2339

2548

2340

2549

client_settings = Client.config_parser(client_config)

2341

2550

old_client_settings = {}

2342

2551

clients_data = {}

2343

2552

2553

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

2554

global wnull

2555

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

2556

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

2557

# mode

2558

if debug or not foreground:

2559

wnull.close()

2560

2344

2561

# Get client data and settings from last running state.

2345

2562

if server_settings["restore"]:

2346

2563

try:

2349

2566

(stored_state))

2350

2567

os.remove(stored_state_path)

2351

2568

except IOError as e:

2352

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

2353

.format(e))

2354

if e.errno != errno.ENOENT:

2569

if e.errno == errno.ENOENT:

2570

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

2571

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

2572

else:

2573

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

2574

exc_info=e)

2355

2575

raise

2356

2576

except EOFError as e:

2357

2577

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

2358

"EOFError: {0}".format(e))

2578

"EOFError:", exc_info=e)

2359

2579

2360

2580

with PGPEngine() as pgp:

2361

2581

for client_name, client in clients_data.iteritems():

2582

# Skip removed clients

2583

if client_name not in client_settings:

2584

continue

2585

2362

2586

# Decide which value to use after restoring saved state.

2363

2587

# We have three different values: Old config file,

2364

2588

# new config file, and saved state.

2414

2638

.format(client_name))

2415

2639

client["secret"] = (

2416

2640

client_settings[client_name]["secret"])

2417

2418

2641

2419

2642

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

2420

2643

for client_name in (set(old_client_settings)

2423

2646

for client_name in (set(client_settings)

2424

2647

- set(old_client_settings)):

2425

2648

clients_data[client_name] = client_settings[client_name]

2426

2649

2427

2650

# Create all client objects

2428

2651

for client_name, client in clients_data.iteritems():

2429

2652

tcp_server.clients[client_name] = client_class(

2430

name = client_name, settings = client)

2653

name = client_name, settings = client,

2654

server_settings = server_settings)

2431

2655

2432

2656

if not tcp_server.clients:

2433

2657

logger.warning("No clients defined")

2434

2435

if not debug:

2436

try:

2437

with pidfile:

2438

pid = os.getpid()

2439

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

2440

del pidfile

2441

except IOError:

2442

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

2443

pidfilename, pid)

2444

except NameError:

2445

# "pidfile" was never created

2446

pass

2658

2659

if not foreground:

2660

if pidfile is not None:

2661

try:

2662

with pidfile:

2663

pid = os.getpid()

2664

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

2665

except IOError:

2666

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

2667

pidfilename, pid)

2668

del pidfile

2447

2669

del pidfilename

2448

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

2449

2670

2450

2671

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

2451

2672

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

2452

2673

2453

2674

if use_dbus:

2675

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

2676

"se.bsnet.fukt.Mandos"})

2454

2677

class MandosDBusService(DBusObjectWithProperties):

2455

2678

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

2456

2679

def __init__(self):

2510

2733

2511

2734

del _interface

2512

2735

2513

class MandosDBusServiceTransitional(MandosDBusService):

2514

__metaclass__ = AlternateDBusNamesMetaclass

2515

mandos_dbus_service = MandosDBusServiceTransitional()

2736

mandos_dbus_service = MandosDBusService()

2516

2737

2517

2738

def cleanup():

2518

2739

"Cleanup function; run on exit"

2519

2740

service.cleanup()

2520

2741

2521

2742

multiprocessing.active_children()

2743

wnull.close()

2522

2744

if not (tcp_server.clients or client_settings):

2523

2745

return

2524

2746

2536

2758

# A list of attributes that can not be pickled

2537

2759

# + secret.

2538

2760

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

2539

"checker"))

2761

"checker", "server_settings"))

2540

2762

for name, typ in (inspect.getmembers

2541

2763

(dbus.service.Object)):

2542

2764

exclude.add(name)

2551

2773

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

2552

2774

2553

2775

try:

2554

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2555

prefix="clients-",

2556

dir=os.path.dirname

2557

(stored_state_path))

2558

with os.fdopen(tempfd, "wb") as stored_state:

2776

with (tempfile.NamedTemporaryFile

2777

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

2778

dir=os.path.dirname(stored_state_path),

2779

delete=False)) as stored_state:

2559

2780

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

2781

tempname=stored_state.name

2560

2782

os.rename(tempname, stored_state_path)

2561

2783

except (IOError, OSError) as e:

2562

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

2563

.format(e))

2564

2784

if not debug:

2565

2785

try:

2566

2786

os.remove(tempname)

2567

2787

except NameError:

2568

2788

pass

2569

if e.errno not in set((errno.ENOENT, errno.EACCES,

2570

errno.EEXIST)):

2789

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

2790

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

2791

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

2792

else:

2793

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

2794

exc_info=e)

2571

2795

raise e

2572

2796

2573

2797

# Delete all clients, and settings from config