/mandos/trunk : revision 237.4.51

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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 = "1.6.7"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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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 = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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"""init logger and add loglevel"""

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global syslogger

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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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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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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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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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return settings

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

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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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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."""

581

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

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return False

583

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if not quiet:

584

self.send_changedstate()

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if not quiet:

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

587

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

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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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def init_checker(self):

603

623

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

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# and every interval from then on.

625

if self.checker_initiator_tag is not None:

626

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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629

self.start_checker))

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

631

if self.disable_initiator_tag is not None:

632

gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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timeout = self.timeout

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

669

self.disable_initiator_tag = None

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

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self.disable_initiator_tag = (gobject.timeout_add

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672

(timedelta_to_milliseconds

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682

If a checker already exists, leave it running and do

658

683

nothing."""

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

660

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

661

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

662

# client would inevitably timeout, since no checker would get

663

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

685

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

686

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

687

# would inevitably timeout, since no checker would get a

688

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

664

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

665

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

666

691

# should be.

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

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try:

670

695

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

671

except (AttributeError, OSError) as error:

672

if (isinstance(error, OSError)

673

and error.errno != errno.ECHILD):

674

raise error

696

except AttributeError:

697

pass

698

except OSError as error:

699

if error.errno != errno.ECHILD:

700

raise

675

701

else:

676

702

if pid:

677

703

logger.warning("Checker was a zombie")

680

706

self.current_checker_command)

681

707

# Start a new checker if needed

682

708

if self.checker is None:

709

# Escape attributes for the shell

710

escaped_attrs = dict(

711

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

712

for attr in

713

self.runtime_expansions)

683

714

try:

684

# In case checker_command has exactly one % operator

685

command = self.checker_command % self.host

686

except TypeError:

687

# Escape attributes for the shell

688

escaped_attrs = dict(

689

(attr,

690

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

691

errors=

692

'replace')))

693

for attr in

694

self.runtime_expansions)

695

696

try:

697

command = self.checker_command % escaped_attrs

698

except TypeError as error:

699

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

700

self.checker_command, exc_info=error)

701

return True # Try again later

715

command = self.checker_command % escaped_attrs

716

except TypeError as error:

717

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

718

self.checker_command, exc_info=error)

719

return True # Try again later

702

720

self.current_checker_command = command

703

721

try:

704

722

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

707

725

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

708

726

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

709

727

# always replaced by /dev/null.)

728

# The exception is when not debugging but nevertheless

729

# running in the foreground; use the previously

730

# created wnull.

731

popen_args = {}

732

if (not self.server_settings["debug"]

733

and self.server_settings["foreground"]):

734

popen_args.update({"stdout": wnull,

735

"stderr": wnull })

710

736

self.checker = subprocess.Popen(command,

711

737

close_fds=True,

712

shell=True, cwd="/")

713

self.checker_callback_tag = (gobject.child_watch_add

714

(self.checker.pid,

715

self.checker_callback,

716

data=command))

717

# The checker may have completed before the gobject

718

# watch was added. Check for this.

719

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

720

if pid:

721

gobject.source_remove(self.checker_callback_tag)

722

self.checker_callback(pid, status, command)

738

shell=True, cwd="/",

739

**popen_args)

723

740

except OSError as error:

724

741

logger.error("Failed to start subprocess",

725

742

exc_info=error)

743

return True

744

self.checker_callback_tag = (gobject.child_watch_add

745

(self.checker.pid,

746

self.checker_callback,

747

data=command))

748

# The checker may have completed before the gobject

749

# watch was added. Check for this.

750

try:

751

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

752

except OSError as error:

753

if error.errno == errno.ECHILD:

754

# This should never happen

755

logger.error("Child process vanished",

756

exc_info=error)

757

return True

758

raise

759

if pid:

760

gobject.source_remove(self.checker_callback_tag)

761

self.checker_callback(pid, status, command)

726

762

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

727

763

return True

728

764

901

937

# The byte_arrays option is not supported yet on

902

938

# signatures other than "ay".

903

939

if prop._dbus_signature != "ay":

904

raise ValueError

940

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

941

"'ay' signature {0!r}"

942

.format(prop._dbus_signature))

905

943

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

906

944

for byte in value))

907

945

prop(value)

979

1017

tag.appendChild(ann_tag)

980

1018

# Add interface annotation tags

981

1019

for annotation, value in dict(

982

itertools.chain(

983

*(annotations().iteritems()

984

for name, annotations in

985

self._get_all_dbus_things("interface")

986

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

987

))).iteritems():

1020

itertools.chain.from_iterable(

1021

annotations().iteritems()

1022

for name, annotations in

1023

self._get_all_dbus_things("interface")

1024

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

1025

)).iteritems():

988

1026

ann_tag = document.createElement("annotation")

989

1027

ann_tag.setAttribute("name", annotation)

990

1028

ann_tag.setAttribute("value", value)

1013

1051

return xmlstring

1014

1052

1015

1053

1016

def datetime_to_dbus (dt, variant_level=0):

1054

def datetime_to_dbus(dt, variant_level=0):

1017

1055

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

1018

1056

if dt is None:

1019

1057

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

1021

1059

variant_level=variant_level)

1022

1060

1023

1061

1024

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

1025

.__metaclass__):

1026

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

1027

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

1062

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1063

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

1064

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

1065

interface names according to the "alt_interface_names" mapping.

1066

Usage:

1067

1068

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

1069

"net.example.AlternateInterface"})

1070

class SampleDBusObject(dbus.service.Object):

1071

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

1072

def SampleDBusMethod():

1073

pass

1074

1075

The above "SampleDBusMethod" on "SampleDBusObject" will be

1076

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

1077

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

1078

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

1079

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

1080

1081

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

1082

(from DBusObjectWithProperties) and interfaces (from the

1083

dbus_interface_annotations decorator).

1028

1084

"""

1029

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

1030

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

1031

# methods, signals, or properties in them

1032

old_interface_names = []

1033

for base in (b for b in bases

1034

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

1035

# Go though all attributes of the base class

1036

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

1085

def wrapper(cls):

1086

for orig_interface_name, alt_interface_name in (

1087

alt_interface_names.iteritems()):

1088

attr = {}

1089

interface_names = set()

1090

# Go though all attributes of the class

1091

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

1037

1092

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

1038

1093

# with the wrong interface name

1039

1094

if (not hasattr(attribute, "_dbus_interface")

1040

1095

or not attribute._dbus_interface

1041

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

1096

.startswith(orig_interface_name)):

1042

1097

continue

1043

1098

# Create an alternate D-Bus interface name based on

1044

1099

# the current name

1045

1100

alt_interface = (attribute._dbus_interface

1046

.replace("se.recompile.Mandos",

1047

"se.bsnet.fukt.Mandos"))

1048

if alt_interface != attribute._dbus_interface:

1049

old_interface_names.append(alt_interface)

1101

.replace(orig_interface_name,

1102

alt_interface_name))

1103

interface_names.add(alt_interface)

1050

1104

# Is this a D-Bus signal?

1051

1105

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

1052

# Extract the original non-method function by

1053

# black magic

1106

# Extract the original non-method undecorated

1107

# function by black magic

1054

1108

nonmethod_func = (dict(

1055

1109

zip(attribute.func_code.co_freevars,

1056

1110

attribute.__closure__))["func"]

1074

1128

except AttributeError:

1075

1129

pass

1076

1130

# Define a creator of a function to call both the

1077

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

1078

# signals gets sent when the function is called

1131

# original and alternate functions, so both the

1132

# original and alternate signals gets sent when

1133

# the function is called

1079

1134

def fixscope(func1, func2):

1080

1135

"""This function is a scope container to pass

1081

1136

func1 and func2 to the "call_both" function

1088

1143

return call_both

1089

1144

# Create the "call_both" function and add it to

1090

1145

# the class

1091

attr[attrname] = fixscope(attribute,

1092

new_function)

1146

attr[attrname] = fixscope(attribute, new_function)

1093

1147

# Is this a D-Bus method?

1094

1148

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

1095

1149

# Create a new, but exactly alike, function

1151

1205

attribute.func_name,

1152

1206

attribute.func_defaults,

1153

1207

attribute.func_closure)))

1154

# Deprecate all old interfaces

1155

iname="_AlternateDBusNamesMetaclass_interface_annotation{0}"

1156

for old_interface_name in old_interface_names:

1157

@dbus_interface_annotations(old_interface_name)

1158

def func(self):

1159

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

1160

# Find an unused name

1161

for aname in (iname.format(i) for i in itertools.count()):

1162

if aname not in attr:

1163

attr[aname] = func

1164

break

1165

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

1166

1167

1208

if deprecate:

1209

# Deprecate all alternate interfaces

1210

iname="_AlternateDBusNames_interface_annotation{0}"

1211

for interface_name in interface_names:

1212

@dbus_interface_annotations(interface_name)

1213

def func(self):

1214

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

1215

"true" }

1216

# Find an unused name

1217

for aname in (iname.format(i)

1218

for i in itertools.count()):

1219

if aname not in attr:

1220

attr[aname] = func

1221

break

1222

if interface_names:

1223

# Replace the class with a new subclass of it with

1224

# methods, signals, etc. as created above.

1225

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

1226

(cls,), attr)

1227

return cls

1228

return wrapper

1229

1230

1231

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

1232

"se.bsnet.fukt.Mandos"})

1168

1233

class ClientDBus(Client, DBusObjectWithProperties):

1169

1234

"""A Client class using D-Bus

1170

1235

1288

1353

*args, **kwargs)

1289

1354

1290

1355

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

1291

old_checker = self.checker

1292

if self.checker is not None:

1293

old_checker_pid = self.checker.pid

1294

else:

1295

old_checker_pid = None

1356

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

1296

1357

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

1297

1358

# Only if new checker process was started

1298

1359

if (self.checker is not None

1306

1367

return False

1307

1368

1308

1369

def approve(self, value=True):

1309

self.send_changedstate()

1310

1370

self.approved = value

1311

1371

gobject.timeout_add(timedelta_to_milliseconds

1312

1372

(self.approval_duration),

1313

1373

self._reset_approved)

1374

self.send_changedstate()

1314

1375

1315

1376

## D-Bus methods, signals & properties

1316

1377

_interface = "se.recompile.Mandos.Client"

1500

1561

def Timeout_dbus_property(self, value=None):

1501

1562

if value is None: # get

1502

1563

return dbus.UInt64(self.timeout_milliseconds())

1564

old_timeout = self.timeout

1503

1565

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

1504

# Reschedule timeout

1566

# Reschedule disabling

1505

1567

if self.enabled:

1506

1568

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:

1569

self.expires += self.timeout - old_timeout

1570

if self.expires <= now:

1510

1571

# The timeout has passed

1511

1572

self.disable()

1512

1573

else:

1513

self.expires = (now +

1514

datetime.timedelta(milliseconds =

1515

time_to_die))

1516

1574

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

1517

1575

is None):

1518

1576

return

1519

1577

gobject.source_remove(self.disable_initiator_tag)

1520

self.disable_initiator_tag = (gobject.timeout_add

1521

(time_to_die,

1522

self.disable))

1578

self.disable_initiator_tag = (

1579

gobject.timeout_add(

1580

timedelta_to_milliseconds(self.expires - now),

1581

self.disable))

1523

1582

1524

1583

# ExtendedTimeout - property

1525

1584

@dbus_service_property(_interface, signature="t",

1604

1663

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

1605

1664

1606

1665

1607

class ClientDBusTransitional(ClientDBus):

1608

__metaclass__ = AlternateDBusNamesMetaclass

1609

1610

1611

1666

class ClientHandler(socketserver.BaseRequestHandler, object):

1612

1667

"""A class to handle client connections.

1613

1668

1649

1704

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

1650

1705

try:

1651

1706

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

1652

raise RuntimeError

1707

raise RuntimeError(line)

1653

1708

except (ValueError, IndexError, RuntimeError) as error:

1654

1709

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

1655

1710

return

1717

1772

#wait until timeout or approved

1718

1773

time = datetime.datetime.now()

1719

1774

client.changedstate.acquire()

1720

(client.changedstate.wait

1721

(float(client.timedelta_to_milliseconds(delay)

1722

/ 1000)))

1775

client.changedstate.wait(

1776

float(timedelta_to_milliseconds(delay)

1777

/ 1000))

1723

1778

client.changedstate.release()

1724

1779

time2 = datetime.datetime.now()

1725

1780

if (time2 - time) >= delay:

1841

1896

def process_request(self, request, address):

1842

1897

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

1843

1898

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

1844

args = (request,

1845

address))

1899

args = (request, address))

1846

1900

proc.start()

1847

1901

return proc

1848

1902

1863

1917

1864

1918

def add_pipe(self, parent_pipe, proc):

1865

1919

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

1866

raise NotImplementedError

1920

raise NotImplementedError()

1867

1921

1868

1922

1869

1923

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1876

1930

use_ipv6: Boolean; to use IPv6 or not

1877

1931

"""

1878

1932

def __init__(self, server_address, RequestHandlerClass,

1879

interface=None, use_ipv6=True):

1933

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

1934

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

1935

creating a new one with socket.socket().

1936

"""

1880

1937

self.interface = interface

1881

1938

if use_ipv6:

1882

1939

self.address_family = socket.AF_INET6

1940

if socketfd is not None:

1941

# Save the file descriptor

1942

self.socketfd = socketfd

1943

# Save the original socket.socket() function

1944

self.socket_socket = socket.socket

1945

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

1946

#

1947

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

1948

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

1949

# patching socket.socket.)

1950

#

1951

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

1952

@functools.wraps(socket.socket)

1953

def socket_wrapper(*args, **kwargs):

1954

# Restore original function so subsequent calls are

1955

# not affected.

1956

socket.socket = self.socket_socket

1957

del self.socket_socket

1958

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

1959

# saved file descriptor.

1960

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

1961

# Replace socket.socket() function with wrapper

1962

socket.socket = socket_wrapper

1963

# The socketserver.TCPServer.__init__ will call

1964

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

1965

# socket_wrapper(), if socketfd was set.

1883

1966

socketserver.TCPServer.__init__(self, server_address,

1884

1967

RequestHandlerClass)

1968

1885

1969

def server_bind(self):

1886

1970

"""This overrides the normal server_bind() function

1887

1971

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

1895

1979

try:

1896

1980

self.socket.setsockopt(socket.SOL_SOCKET,

1897

1981

SO_BINDTODEVICE,

1898

str(self.interface

1899

+ '\0'))

1982

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

1900

1983

except socket.error as error:

1901

if error[0] == errno.EPERM:

1902

logger.error("No permission to"

1903

" bind to interface %s",

1904

self.interface)

1905

elif error[0] == errno.ENOPROTOOPT:

1984

if error.errno == errno.EPERM:

1985

logger.error("No permission to bind to"

1986

" interface %s", self.interface)

1987

elif error.errno == errno.ENOPROTOOPT:

1906

1988

logger.error("SO_BINDTODEVICE not available;"

1907

1989

" cannot bind to interface %s",

1908

1990

self.interface)

1991

elif error.errno == errno.ENODEV:

1992

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

1993

" cannot bind", self.interface)

1909

1994

else:

1910

1995

raise

1911

1996

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

1914

1999

if self.address_family == socket.AF_INET6:

1915

2000

any_address = "::" # in6addr_any

1916

2001

else:

1917

any_address = socket.INADDR_ANY

2002

any_address = "0.0.0.0" # INADDR_ANY

1918

2003

self.server_address = (any_address,

1919

2004

self.server_address[1])

1920

2005

elif not self.server_address[1]:

1941

2026

"""

1942

2027

def __init__(self, server_address, RequestHandlerClass,

1943

2028

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

1944

gnutls_priority=None, use_dbus=True):

2029

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

1945

2030

self.enabled = False

1946

2031

self.clients = clients

1947

2032

if self.clients is None:

1951

2036

IPv6_TCPServer.__init__(self, server_address,

1952

2037

RequestHandlerClass,

1953

2038

interface = interface,

1954

use_ipv6 = use_ipv6)

2039

use_ipv6 = use_ipv6,

2040

socketfd = socketfd)

1955

2041

def server_activate(self):

1956

2042

if self.enabled:

1957

2043

return socketserver.TCPServer.server_activate(self)

1970

2056

1971

2057

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

1972

2058

proc = None, client_object=None):

1973

condition_names = {

1974

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

1975

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

1976

# blocking).

1977

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

1978

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

1979

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

1980

# broken, usually for pipes and

1981

# sockets).

1982

}

1983

conditions_string = ' | '.join(name

1984

for cond, name in

1985

condition_names.iteritems()

1986

if cond & condition)

1987

2059

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

1988

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

2060

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

1989

2061

# Wait for other process to exit

1990

2062

proc.join()

1991

2063

return False

2049

2121

return True

2050

2122

2051

2123

2124

def rfc3339_duration_to_delta(duration):

2125

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

2126

2127

>>> rfc3339_duration_to_delta("P7D")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT60S")

2130

datetime.timedelta(0, 60)

2131

>>> rfc3339_duration_to_delta("PT60M")

2132

datetime.timedelta(0, 3600)

2133

>>> rfc3339_duration_to_delta("PT24H")

2134

datetime.timedelta(1)

2135

>>> rfc3339_duration_to_delta("P1W")

2136

datetime.timedelta(7)

2137

>>> rfc3339_duration_to_delta("PT5M30S")

2138

datetime.timedelta(0, 330)

2139

>>> rfc3339_duration_to_delta("P1DT3M20S")

2140

datetime.timedelta(1, 200)

2141

"""

2142

2143

# Parsing an RFC 3339 duration with regular expressions is not

2144

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

2145

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

2146

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

2147

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

2148

# avoid excessive use of external libraries.

2149

2150

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

2151

Token = collections.namedtuple("Token",

2152

("regexp", # To match token; if

2153

# "value" is not None,

2154

# must have a "group"

2155

# containing digits

2156

"value", # datetime.timedelta or

2157

# None

2158

"followers")) # Tokens valid after

2159

# this token

2160

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

2161

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

2162

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

2163

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

2164

datetime.timedelta(seconds=1),

2165

frozenset((token_end,)))

2166

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

2167

datetime.timedelta(minutes=1),

2168

frozenset((token_second, token_end)))

2169

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

2170

datetime.timedelta(hours=1),

2171

frozenset((token_minute, token_end)))

2172

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

2173

None,

2174

frozenset((token_hour, token_minute,

2175

token_second)))

2176

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

2177

datetime.timedelta(days=1),

2178

frozenset((token_time, token_end)))

2179

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

2180

datetime.timedelta(weeks=4),

2181

frozenset((token_day, token_end)))

2182

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

2183

datetime.timedelta(weeks=52),

2184

frozenset((token_month, token_end)))

2185

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

2186

datetime.timedelta(weeks=1),

2187

frozenset((token_end,)))

2188

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

2189

frozenset((token_year, token_month,

2190

token_day, token_time,

2191

token_week))),

2192

# Define starting values

2193

value = datetime.timedelta() # Value so far

2194

found_token = None

2195

followers = frozenset(token_duration,) # Following valid tokens

2196

s = duration # String left to parse

2197

# Loop until end token is found

2198

while found_token is not token_end:

2199

# Search for any currently valid tokens

2200

for token in followers:

2201

match = token.regexp.match(s)

2202

if match is not None:

2203

# Token found

2204

if token.value is not None:

2205

# Value found, parse digits

2206

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

2207

# Add to value so far

2208

value += factor * token.value

2209

# Strip token from string

2210

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

2211

# Go to found token

2212

found_token = token

2213

# Set valid next tokens

2214

followers = found_token.followers

2215

break

2216

else:

2217

# No currently valid tokens were found

2218

raise ValueError("Invalid RFC 3339 duration")

2219

# End token found

2220

return value

2221

2222

2052

2223

def string_to_delta(interval):

2053

2224

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

2054

2225

2065

2236

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

2066

2237

datetime.timedelta(0, 330)

2067

2238

"""

2239

2240

try:

2241

return rfc3339_duration_to_delta(interval)

2242

except ValueError:

2243

pass

2244

2068

2245

timevalue = datetime.timedelta(0)

2069

2246

for s in interval.split():

2070

2247

try:

2083

2260

else:

2084

2261

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

2085

2262

.format(suffix))

2086

except (ValueError, IndexError) as e:

2263

except IndexError as e:

2087

2264

raise ValueError(*(e.args))

2088

2265

timevalue += delta

2089

2266

return timevalue

2133

2310

help="Run self-test")

2134

2311

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

2135

2312

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

2136

" to terminal")

2313

" to terminal", default=None)

2137

2314

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

2138

2315

help="Debug level for stdout output")

2139

2316

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

2146

2323

" files")

2147

2324

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

2148

2325

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

2149

" system bus interface")

2326

" system bus interface", default=None)

2150

2327

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

2151

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

2328

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

2329

default=None)

2152

2330

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

2153

2331

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

2154

" state")

2332

" state", default=None)

2333

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

2334

help="Specify a file descriptor to a network"

2335

" socket to use instead of creating one")

2155

2336

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

2156

2337

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

2338

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

2339

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

2340

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

2341

dest="zeroconf", help="Do not use Zeroconf",

2342

default=None)

2157

2343

2158

2344

options = parser.parse_args()

2159

2345

2160

2346

if options.check:

2161

2347

import doctest

2162

doctest.testmod()

2163

sys.exit()

2348

fail_count, test_count = doctest.testmod()

2349

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

2164

2350

2165

2351

# Default values for config file for server-global settings

2166

2352

server_defaults = { "interface": "",

2168

2354

"port": "",

2169

2355

"debug": "False",

2170

2356

"priority":

2171

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

2357

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

2172

2358

"servicename": "Mandos",

2173

2359

"use_dbus": "True",

2174

2360

"use_ipv6": "True",

2175

2361

"debuglevel": "",

2176

2362

"restore": "True",

2177

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

2363

"socket": "",

2364

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

2365

"foreground": "False",

2366

"zeroconf": "True",

2178

2367

}

2179

2368

2180

2369

# Parse config file for server-global settings

2185

2374

# Convert the SafeConfigParser object to a dict

2186

2375

server_settings = server_config.defaults()

2187

2376

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

2188

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

2377

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

2189

2378

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

2190

2379

option)

2191

2380

if server_settings["port"]:

2192

2381

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

2193

2382

"port")

2383

if server_settings["socket"]:

2384

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

2385

"socket")

2386

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

2387

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

2388

# happen with a supplied network socket.

2389

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

2390

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

2391

["socket"])

2194

2392

del server_config

2195

2393

2196

2394

# Override the settings from the config file with command line

2198

2396

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

2199

2397

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

2200

2398

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

2201

"statedir"):

2399

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

2202

2400

value = getattr(options, option)

2203

2401

if value is not None:

2204

2402

server_settings[option] = value

2207

2405

for option in server_settings.keys():

2208

2406

if type(server_settings[option]) is str:

2209

2407

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

2408

# Force all boolean options to be boolean

2409

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

2410

"foreground", "zeroconf"):

2411

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

2412

# Debug implies foreground

2413

if server_settings["debug"]:

2414

server_settings["foreground"] = True

2210

2415

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

2211

2416

2212

2417

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

2213

2418

2419

if (not server_settings["zeroconf"] and

2420

not (server_settings["port"]

2421

or server_settings["socket"] != "")):

2422

parser.error("Needs port or socket to work without"

2423

" Zeroconf")

2424

2214

2425

# For convenience

2215

2426

debug = server_settings["debug"]

2216

2427

debuglevel = server_settings["debuglevel"]

2218

2429

use_ipv6 = server_settings["use_ipv6"]

2219

2430

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

2220

2431

stored_state_file)

2432

foreground = server_settings["foreground"]

2433

zeroconf = server_settings["zeroconf"]

2221

2434

2222

2435

if debug:

2223

2436

initlogger(debug, logging.DEBUG)

2244

2457

global mandos_dbus_service

2245

2458

mandos_dbus_service = None

2246

2459

2460

socketfd = None

2461

if server_settings["socket"] != "":

2462

socketfd = server_settings["socket"]

2247

2463

tcp_server = MandosServer((server_settings["address"],

2248

2464

server_settings["port"]),

2249

2465

ClientHandler,

2252

2468

use_ipv6=use_ipv6,

2253

2469

gnutls_priority=

2254

2470

server_settings["priority"],

2255

use_dbus=use_dbus)

2256

if not debug:

2257

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

2471

use_dbus=use_dbus,

2472

socketfd=socketfd)

2473

if not foreground:

2474

pidfilename = "/run/mandos.pid"

2475

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

2476

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

2477

pidfile = None

2258

2478

try:

2259

2479

pidfile = open(pidfilename, "w")

2260

2480

except IOError as e:

2275

2495

os.setgid(gid)

2276

2496

os.setuid(uid)

2277

2497

except OSError as error:

2278

if error[0] != errno.EPERM:

2279

raise error

2498

if error.errno != errno.EPERM:

2499

raise

2280

2500

2281

2501

if debug:

2282

2502

# Enable all possible GnuTLS debugging

2299

2519

os.close(null)

2300

2520

2301

2521

# Need to fork before connecting to D-Bus

2302

if not debug:

2522

if not foreground:

2303

2523

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

2304

2524

daemon()

2305

2525

2526

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

2527

# need to inform gobject that threads will be used.

2306

2528

gobject.threads_init()

2307

2529

2308

2530

global main_loop

2323

2545

use_dbus = False

2324

2546

server_settings["use_dbus"] = False

2325

2547

tcp_server.use_dbus = False

2326

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2327

service = AvahiServiceToSyslog(name =

2328

server_settings["servicename"],

2329

servicetype = "_mandos._tcp",

2330

protocol = protocol, bus = bus)

2331

if server_settings["interface"]:

2332

service.interface = (if_nametoindex

2333

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

2548

if zeroconf:

2549

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2550

service = AvahiServiceToSyslog(name =

2551

server_settings["servicename"],

2552

servicetype = "_mandos._tcp",

2553

protocol = protocol, bus = bus)

2554

if server_settings["interface"]:

2555

service.interface = (if_nametoindex

2556

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

2334

2557

2335

2558

global multiprocessing_manager

2336

2559

multiprocessing_manager = multiprocessing.Manager()

2337

2560

2338

2561

client_class = Client

2339

2562

if use_dbus:

2340

client_class = functools.partial(ClientDBusTransitional,

2341

bus = bus)

2563

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

2342

2564

2343

2565

client_settings = Client.config_parser(client_config)

2344

2566

old_client_settings = {}

2345

2567

clients_data = {}

2346

2568

2569

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

2570

global wnull

2571

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

2572

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

2573

# mode

2574

if debug or not foreground:

2575

wnull.close()

2576

2347

2577

# Get client data and settings from last running state.

2348

2578

if server_settings["restore"]:

2349

2579

try:

2365

2595

2366

2596

with PGPEngine() as pgp:

2367

2597

for client_name, client in clients_data.iteritems():

2598

# Skip removed clients

2599

if client_name not in client_settings:

2600

continue

2601

2368

2602

# Decide which value to use after restoring saved state.

2369

2603

# We have three different values: Old config file,

2370

2604

# new config file, and saved state.

2432

2666

# Create all client objects

2433

2667

for client_name, client in clients_data.iteritems():

2434

2668

tcp_server.clients[client_name] = client_class(

2435

name = client_name, settings = client)

2669

name = client_name, settings = client,

2670

server_settings = server_settings)

2436

2671

2437

2672

if not tcp_server.clients:

2438

2673

logger.warning("No clients defined")

2439

2674

2440

if not debug:

2441

try:

2442

with pidfile:

2443

pid = os.getpid()

2444

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

2445

del pidfile

2446

except IOError:

2447

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

2448

pidfilename, pid)

2449

except NameError:

2450

# "pidfile" was never created

2451

pass

2675

if not foreground:

2676

if pidfile is not None:

2677

try:

2678

with pidfile:

2679

pid = os.getpid()

2680

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

2681

except IOError:

2682

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

2683

pidfilename, pid)

2684

del pidfile

2452

2685

del pidfilename

2453

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

2454

2686

2455

2687

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

2456

2688

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

2457

2689

2458

2690

if use_dbus:

2691

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

2692

"se.bsnet.fukt.Mandos"})

2459

2693

class MandosDBusService(DBusObjectWithProperties):

2460

2694

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

2461

2695

def __init__(self):

2515

2749

2516

2750

del _interface

2517

2751

2518

class MandosDBusServiceTransitional(MandosDBusService):

2519

__metaclass__ = AlternateDBusNamesMetaclass

2520

mandos_dbus_service = MandosDBusServiceTransitional()

2752

mandos_dbus_service = MandosDBusService()

2521

2753

2522

2754

def cleanup():

2523

2755

"Cleanup function; run on exit"

2524

service.cleanup()

2756

if zeroconf:

2757

service.cleanup()

2525

2758

2526

2759

multiprocessing.active_children()

2760

wnull.close()

2527

2761

if not (tcp_server.clients or client_settings):

2528

2762

return

2529

2763

2541

2775

# A list of attributes that can not be pickled

2542

2776

# + secret.

2543

2777

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

2544

"checker"))

2778

"checker", "server_settings"))

2545

2779

for name, typ in (inspect.getmembers

2546

2780

(dbus.service.Object)):

2547

2781

exclude.add(name)

2556

2790

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

2557

2791

2558

2792

try:

2559

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

2560

prefix="clients-",

2561

dir=os.path.dirname

2562

(stored_state_path))

2563

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

2793

with (tempfile.NamedTemporaryFile

2794

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

2795

dir=os.path.dirname(stored_state_path),

2796

delete=False)) as stored_state:

2564

2797

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

2798

tempname=stored_state.name

2565

2799

os.rename(tempname, stored_state_path)

2566

2800

except (IOError, OSError) as e:

2567

2801

if not debug:

2575

2809

else:

2576

2810

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

2577

2811

exc_info=e)

2578

raise e

2812

raise

2579

2813

2580

2814

# Delete all clients, and settings from config

2581

2815

while tcp_server.clients:

2605

2839

tcp_server.server_activate()

2606

2840

2607

2841

# Find out what port we got

2608

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

2842

if zeroconf:

2843

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

2609

2844

if use_ipv6:

2610

2845

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

2611

2846

" flowinfo %d, scope_id %d",

2617

2852

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

2618

2853

2619

2854

try:

2620

# From the Avahi example code

2621

try:

2622

service.activate()

2623

except dbus.exceptions.DBusException as error:

2624

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

2625

cleanup()

2626

sys.exit(1)

2627

# End of Avahi example code

2855

if zeroconf:

2856

# From the Avahi example code

2857

try:

2858

service.activate()

2859

except dbus.exceptions.DBusException as error:

2860

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

2861

cleanup()

2862

sys.exit(1)

2863

# End of Avahi example code

2628

2864

2629

2865

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

2630

2866

lambda *args, **kwargs: