/mandos/trunk : revision 659

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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 = "1.6.4"

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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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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."""

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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

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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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621

def init_checker(self):

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

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# and every interval from then on.

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if self.checker_initiator_tag is not None:

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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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629

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

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if self.disable_initiator_tag is not None:

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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)

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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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(timedelta_to_milliseconds

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681

If a checker already exists, leave it running and do

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nothing."""

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

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# 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

684

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

685

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

686

# would inevitably timeout, since no checker would get a

687

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

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

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

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# should be.

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

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try:

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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

695

except AttributeError:

696

pass

697

except OSError as error:

698

if error.errno != errno.ECHILD:

699

raise

675

700

else:

676

701

if pid:

677

702

logger.warning("Checker was a zombie")

680

705

self.current_checker_command)

681

706

# Start a new checker if needed

682

707

if self.checker is None:

708

# Escape attributes for the shell

709

escaped_attrs = dict(

710

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

711

for attr in

712

self.runtime_expansions)

683

713

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

714

command = self.checker_command % escaped_attrs

715

except TypeError as error:

716

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

717

self.checker_command, exc_info=error)

718

return True # Try again later

702

719

self.current_checker_command = command

703

720

try:

704

721

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

707

724

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

708

725

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

709

726

# always replaced by /dev/null.)

727

# The exception is when not debugging but nevertheless

728

# running in the foreground; use the previously

729

# created wnull.

730

popen_args = {}

731

if (not self.server_settings["debug"]

732

and self.server_settings["foreground"]):

733

popen_args.update({"stdout": wnull,

734

"stderr": wnull })

710

735

self.checker = subprocess.Popen(command,

711

736

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)

737

shell=True, cwd="/",

738

**popen_args)

723

739

except OSError as error:

724

740

logger.error("Failed to start subprocess",

725

741

exc_info=error)

742

return True

743

self.checker_callback_tag = (gobject.child_watch_add

744

(self.checker.pid,

745

self.checker_callback,

746

data=command))

747

# The checker may have completed before the gobject

748

# watch was added. Check for this.

749

try:

750

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

751

except OSError as error:

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

758

if pid:

759

gobject.source_remove(self.checker_callback_tag)

760

self.checker_callback(pid, status, command)

726

761

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

727

762

return True

728

763

901

936

# The byte_arrays option is not supported yet on

902

937

# signatures other than "ay".

903

938

if prop._dbus_signature != "ay":

904

raise ValueError

939

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

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

905

942

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

906

943

for byte in value))

907

944

prop(value)

979

1016

tag.appendChild(ann_tag)

980

1017

# Add interface annotation tags

981

1018

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():

1019

itertools.chain.from_iterable(

1020

annotations().iteritems()

1021

for name, annotations in

1022

self._get_all_dbus_things("interface")

1023

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

1024

)).iteritems():

988

1025

ann_tag = document.createElement("annotation")

989

1026

ann_tag.setAttribute("name", annotation)

990

1027

ann_tag.setAttribute("value", value)

1013

1050

return xmlstring

1014

1051

1015

1052

1016

def datetime_to_dbus (dt, variant_level=0):

1053

def datetime_to_dbus(dt, variant_level=0):

1017

1054

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

1018

1055

if dt is None:

1019

1056

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

1021

1058

variant_level=variant_level)

1022

1059

1023

1060

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.

1061

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1062

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

1063

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

1064

interface names according to the "alt_interface_names" mapping.

1065

Usage:

1066

1067

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

1068

"net.example.AlternateInterface"})

1069

class SampleDBusObject(dbus.service.Object):

1070

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

1071

def SampleDBusMethod():

1072

pass

1073

1074

The above "SampleDBusMethod" on "SampleDBusObject" will be

1075

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

1076

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

1077

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

1078

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

1079

1080

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

1081

(from DBusObjectWithProperties) and interfaces (from the

1082

dbus_interface_annotations decorator).

1028

1083

"""

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):

1084

def wrapper(cls):

1085

for orig_interface_name, alt_interface_name in (

1086

alt_interface_names.iteritems()):

1087

attr = {}

1088

interface_names = set()

1089

# Go though all attributes of the class

1090

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

1037

1091

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

1038

1092

# with the wrong interface name

1039

1093

if (not hasattr(attribute, "_dbus_interface")

1040

1094

or not attribute._dbus_interface

1041

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

1095

.startswith(orig_interface_name)):

1042

1096

continue

1043

1097

# Create an alternate D-Bus interface name based on

1044

1098

# the current name

1045

1099

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)

1100

.replace(orig_interface_name,

1101

alt_interface_name))

1102

interface_names.add(alt_interface)

1050

1103

# Is this a D-Bus signal?

1051

1104

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

1052

# Extract the original non-method function by

1053

# black magic

1105

# Extract the original non-method undecorated

1106

# function by black magic

1054

1107

nonmethod_func = (dict(

1055

1108

zip(attribute.func_code.co_freevars,

1056

1109

attribute.__closure__))["func"]

1074

1127

except AttributeError:

1075

1128

pass

1076

1129

# 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

1130

# original and alternate functions, so both the

1131

# original and alternate signals gets sent when

1132

# the function is called

1079

1133

def fixscope(func1, func2):

1080

1134

"""This function is a scope container to pass

1081

1135

func1 and func2 to the "call_both" function

1088

1142

return call_both

1089

1143

# Create the "call_both" function and add it to

1090

1144

# the class

1091

attr[attrname] = fixscope(attribute,

1092

new_function)

1145

attr[attrname] = fixscope(attribute, new_function)

1093

1146

# Is this a D-Bus method?

1094

1147

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

1095

1148

# Create a new, but exactly alike, function

1151

1204

attribute.func_name,

1152

1205

attribute.func_defaults,

1153

1206

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

1207

if deprecate:

1208

# Deprecate all alternate interfaces

1209

iname="_AlternateDBusNames_interface_annotation{0}"

1210

for interface_name in interface_names:

1211

@dbus_interface_annotations(interface_name)

1212

def func(self):

1213

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

1214

"true" }

1215

# Find an unused name

1216

for aname in (iname.format(i)

1217

for i in itertools.count()):

1218

if aname not in attr:

1219

attr[aname] = func

1220

break

1221

if interface_names:

1222

# Replace the class with a new subclass of it with

1223

# methods, signals, etc. as created above.

1224

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

1225

(cls,), attr)

1226

return cls

1227

return wrapper

1228

1229

1230

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

1231

"se.bsnet.fukt.Mandos"})

1168

1232

class ClientDBus(Client, DBusObjectWithProperties):

1169

1233

"""A Client class using D-Bus

1170

1234

1288

1352

*args, **kwargs)

1289

1353

1290

1354

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

1355

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

1296

1356

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

1297

1357

# Only if new checker process was started

1298

1358

if (self.checker is not None

1306

1366

return False

1307

1367

1308

1368

def approve(self, value=True):

1309

self.send_changedstate()

1310

1369

self.approved = value

1311

1370

gobject.timeout_add(timedelta_to_milliseconds

1312

1371

(self.approval_duration),

1313

1372

self._reset_approved)

1373

self.send_changedstate()

1314

1374

1315

1375

## D-Bus methods, signals & properties

1316

1376

_interface = "se.recompile.Mandos.Client"

1500

1560

def Timeout_dbus_property(self, value=None):

1501

1561

if value is None: # get

1502

1562

return dbus.UInt64(self.timeout_milliseconds())

1563

old_timeout = self.timeout

1503

1564

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

1504

# Reschedule timeout

1565

# Reschedule disabling

1505

1566

if self.enabled:

1506

1567

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:

1568

self.expires += self.timeout - old_timeout

1569

if self.expires <= now:

1510

1570

# The timeout has passed

1511

1571

self.disable()

1512

1572

else:

1513

self.expires = (now +

1514

datetime.timedelta(milliseconds =

1515

time_to_die))

1516

1573

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

1517

1574

is None):

1518

1575

return

1519

1576

gobject.source_remove(self.disable_initiator_tag)

1520

self.disable_initiator_tag = (gobject.timeout_add

1521

(time_to_die,

1522

self.disable))

1577

self.disable_initiator_tag = (

1578

gobject.timeout_add(

1579

timedelta_to_milliseconds(self.expires - now),

1580

self.disable))

1523

1581

1524

1582

# ExtendedTimeout - property

1525

1583

@dbus_service_property(_interface, signature="t",

1604

1662

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

1605

1663

1606

1664

1607

class ClientDBusTransitional(ClientDBus):

1608

__metaclass__ = AlternateDBusNamesMetaclass

1609

1610

1611

1665

class ClientHandler(socketserver.BaseRequestHandler, object):

1612

1666

"""A class to handle client connections.

1613

1667

1649

1703

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

1650

1704

try:

1651

1705

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

1652

raise RuntimeError

1706

raise RuntimeError(line)

1653

1707

except (ValueError, IndexError, RuntimeError) as error:

1654

1708

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

1655

1709

return

1717

1771

#wait until timeout or approved

1718

1772

time = datetime.datetime.now()

1719

1773

client.changedstate.acquire()

1720

(client.changedstate.wait

1721

(float(client.timedelta_to_milliseconds(delay)

1722

/ 1000)))

1774

client.changedstate.wait(

1775

float(timedelta_to_milliseconds(delay)

1776

/ 1000))

1723

1777

client.changedstate.release()

1724

1778

time2 = datetime.datetime.now()

1725

1779

if (time2 - time) >= delay:

1841

1895

def process_request(self, request, address):

1842

1896

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

1843

1897

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

1844

args = (request,

1845

address))

1898

args = (request, address))

1846

1899

proc.start()

1847

1900

return proc

1848

1901

1863

1916

1864

1917

def add_pipe(self, parent_pipe, proc):

1865

1918

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

1866

raise NotImplementedError

1919

raise NotImplementedError()

1867

1920

1868

1921

1869

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1876

1929

use_ipv6: Boolean; to use IPv6 or not

1877

1930

"""

1878

1931

def __init__(self, server_address, RequestHandlerClass,

1879

interface=None, use_ipv6=True):

1932

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

1933

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

1934

creating a new one with socket.socket().

1935

"""

1880

1936

self.interface = interface

1881

1937

if use_ipv6:

1882

1938

self.address_family = socket.AF_INET6

1939

if socketfd is not None:

1940

# Save the file descriptor

1941

self.socketfd = socketfd

1942

# Save the original socket.socket() function

1943

self.socket_socket = socket.socket

1944

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

1945

#

1946

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

1947

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

1948

# patching socket.socket.)

1949

#

1950

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

1951

@functools.wraps(socket.socket)

1952

def socket_wrapper(*args, **kwargs):

1953

# Restore original function so subsequent calls are

1954

# not affected.

1955

socket.socket = self.socket_socket

1956

del self.socket_socket

1957

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

1958

# saved file descriptor.

1959

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

1960

# Replace socket.socket() function with wrapper

1961

socket.socket = socket_wrapper

1962

# The socketserver.TCPServer.__init__ will call

1963

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

1964

# socket_wrapper(), if socketfd was set.

1883

1965

socketserver.TCPServer.__init__(self, server_address,

1884

1966

RequestHandlerClass)

1967

1885

1968

def server_bind(self):

1886

1969

"""This overrides the normal server_bind() function

1887

1970

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

1895

1978

try:

1896

1979

self.socket.setsockopt(socket.SOL_SOCKET,

1897

1980

SO_BINDTODEVICE,

1898

str(self.interface

1899

+ '\0'))

1981

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

1900

1982

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:

1983

if error.errno == errno.EPERM:

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1986

elif error.errno == errno.ENOPROTOOPT:

1906

1987

logger.error("SO_BINDTODEVICE not available;"

1907

1988

" cannot bind to interface %s",

1908

1989

self.interface)

1990

elif error.errno == errno.ENODEV:

1991

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

1992

" cannot bind", self.interface)

1909

1993

else:

1910

1994

raise

1911

1995

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

1914

1998

if self.address_family == socket.AF_INET6:

1915

1999

any_address = "::" # in6addr_any

1916

2000

else:

1917

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1918

2002

self.server_address = (any_address,

1919

2003

self.server_address[1])

1920

2004

elif not self.server_address[1]:

1941

2025

"""

1942

2026

def __init__(self, server_address, RequestHandlerClass,

1943

2027

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

1944

gnutls_priority=None, use_dbus=True):

2028

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

1945

2029

self.enabled = False

1946

2030

self.clients = clients

1947

2031

if self.clients is None:

1951

2035

IPv6_TCPServer.__init__(self, server_address,

1952

2036

RequestHandlerClass,

1953

2037

interface = interface,

1954

use_ipv6 = use_ipv6)

2038

use_ipv6 = use_ipv6,

2039

socketfd = socketfd)

1955

2040

def server_activate(self):

1956

2041

if self.enabled:

1957

2042

return socketserver.TCPServer.server_activate(self)

1970

2055

1971

2056

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

1972

2057

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

2058

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

1988

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

2059

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

1989

2060

# Wait for other process to exit

1990

2061

proc.join()

1991

2062

return False

2049

2120

return True

2050

2121

2051

2122

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2052

2222

def string_to_delta(interval):

2053

2223

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

2054

2224

2065

2235

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

2066

2236

datetime.timedelta(0, 330)

2067

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2068

2244

timevalue = datetime.timedelta(0)

2069

2245

for s in interval.split():

2070

2246

try:

2083

2259

else:

2084

2260

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

2085

2261

.format(suffix))

2086

except (ValueError, IndexError) as e:

2262

except IndexError as e:

2087

2263

raise ValueError(*(e.args))

2088

2264

timevalue += delta

2089

2265

return timevalue

2133

2309

help="Run self-test")

2134

2310

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

2135

2311

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

2136

" to terminal")

2312

" to terminal", default=None)

2137

2313

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

2138

2314

help="Debug level for stdout output")

2139

2315

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

2146

2322

" files")

2147

2323

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

2148

2324

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

2149

" system bus interface")

2325

" system bus interface", default=None)

2150

2326

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

2151

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

2327

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

2328

default=None)

2152

2329

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

2153

2330

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

2154

" state")

2331

" state", default=None)

2332

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

2333

help="Specify a file descriptor to a network"

2334

" socket to use instead of creating one")

2155

2335

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

2156

2336

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

2337

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

2338

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

2157

2339

2158

2340

options = parser.parse_args()

2159

2341

2160

2342

if options.check:

2161

2343

import doctest

2162

doctest.testmod()

2163

sys.exit()

2344

fail_count, test_count = doctest.testmod()

2345

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

2164

2346

2165

2347

# Default values for config file for server-global settings

2166

2348

server_defaults = { "interface": "",

2168

2350

"port": "",

2169

2351

"debug": "False",

2170

2352

"priority":

2171

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

2353

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

2172

2354

"servicename": "Mandos",

2173

2355

"use_dbus": "True",

2174

2356

"use_ipv6": "True",

2175

2357

"debuglevel": "",

2176

2358

"restore": "True",

2177

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

2359

"socket": "",

2360

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

2361

"foreground": "False",

2178

2362

}

2179

2363

2180

2364

# Parse config file for server-global settings

2185

2369

# Convert the SafeConfigParser object to a dict

2186

2370

server_settings = server_config.defaults()

2187

2371

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

2188

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

2372

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

2189

2373

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

2190

2374

option)

2191

2375

if server_settings["port"]:

2192

2376

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

2193

2377

"port")

2378

if server_settings["socket"]:

2379

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

2380

"socket")

2381

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

2382

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

2383

# happen with a supplied network socket.

2384

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

2385

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

2386

["socket"])

2194

2387

del server_config

2195

2388

2196

2389

# Override the settings from the config file with command line

2198

2391

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

2199

2392

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

2200

2393

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

2201

"statedir"):

2394

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

2202

2395

value = getattr(options, option)

2203

2396

if value is not None:

2204

2397

server_settings[option] = value

2207

2400

for option in server_settings.keys():

2208

2401

if type(server_settings[option]) is str:

2209

2402

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2210

2410

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

2211

2411

2212

2412

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

2218

2418

use_ipv6 = server_settings["use_ipv6"]

2219

2419

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

2220

2420

stored_state_file)

2421

foreground = server_settings["foreground"]

2221

2422

2222

2423

if debug:

2223

2424

initlogger(debug, logging.DEBUG)

2252

2453

use_ipv6=use_ipv6,

2253

2454

gnutls_priority=

2254

2455

server_settings["priority"],

2255

use_dbus=use_dbus)

2256

if not debug:

2257

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

2456

use_dbus=use_dbus,

2457

socketfd=(server_settings["socket"]

2458

or None))

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

2258

2464

try:

2259

2465

pidfile = open(pidfilename, "w")

2260

2466

except IOError as e:

2275

2481

os.setgid(gid)

2276

2482

os.setuid(uid)

2277

2483

except OSError as error:

2278

if error[0] != errno.EPERM:

2279

raise error

2484

if error.errno != errno.EPERM:

2485

raise

2280

2486

2281

2487

if debug:

2282

2488

# Enable all possible GnuTLS debugging

2299

2505

os.close(null)

2300

2506

2301

2507

# Need to fork before connecting to D-Bus

2302

if not debug:

2508

if not foreground:

2303

2509

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

2304

2510

daemon()

2305

2511

2512

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

2513

# need to inform gobject that threads will be used.

2306

2514

gobject.threads_init()

2307

2515

2308

2516

global main_loop

2337

2545

2338

2546

client_class = Client

2339

2547

if use_dbus:

2340

client_class = functools.partial(ClientDBusTransitional,

2341

bus = bus)

2548

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

2342

2549

2343

2550

client_settings = Client.config_parser(client_config)

2344

2551

old_client_settings = {}

2345

2552

clients_data = {}

2346

2553

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2347

2562

# Get client data and settings from last running state.

2348

2563

if server_settings["restore"]:

2349

2564

try:

2365

2580

2366

2581

with PGPEngine() as pgp:

2367

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2368

2587

# Decide which value to use after restoring saved state.

2369

2588

# We have three different values: Old config file,

2370

2589

# new config file, and saved state.

2432

2651

# Create all client objects

2433

2652

for client_name, client in clients_data.iteritems():

2434

2653

tcp_server.clients[client_name] = client_class(

2435

name = client_name, settings = client)

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2436

2656

2437

2657

if not tcp_server.clients:

2438

2658

logger.warning("No clients defined")

2439

2659

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

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

2452

2670

del pidfilename

2453

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

2454

2671

2455

2672

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

2456

2673

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

2457

2674

2458

2675

if use_dbus:

2676

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

2677

"se.bsnet.fukt.Mandos"})

2459

2678

class MandosDBusService(DBusObjectWithProperties):

2460

2679

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

2461

2680

def __init__(self):

2515

2734

2516

2735

del _interface

2517

2736

2518

class MandosDBusServiceTransitional(MandosDBusService):

2519

__metaclass__ = AlternateDBusNamesMetaclass

2520

mandos_dbus_service = MandosDBusServiceTransitional()

2737

mandos_dbus_service = MandosDBusService()

2521

2738

2522

2739

def cleanup():

2523

2740

"Cleanup function; run on exit"

2524

2741

service.cleanup()

2525

2742

2526

2743

multiprocessing.active_children()

2744

wnull.close()

2527

2745

if not (tcp_server.clients or client_settings):

2528

2746

return

2529

2747

2541

2759

# A list of attributes that can not be pickled

2542

2760

# + secret.

2543

2761

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

2544

"checker"))

2762

"checker", "server_settings"))

2545

2763

for name, typ in (inspect.getmembers

2546

2764

(dbus.service.Object)):

2547

2765

exclude.add(name)

2556

2774

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

2557

2775

2558

2776

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:

2777

with (tempfile.NamedTemporaryFile

2778

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

2779

dir=os.path.dirname(stored_state_path),

2780

delete=False)) as stored_state:

2564

2781

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

2782

tempname=stored_state.name

2565

2783

os.rename(tempname, stored_state_path)

2566

2784

except (IOError, OSError) as e:

2567

2785

if not debug:

2575

2793

else:

2576

2794

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

2577

2795

exc_info=e)

2578

raise e

2796

raise

2579

2797

2580

2798

# Delete all clients, and settings from config

2581

2799

while tcp_server.clients: