/mandos/trunk : revision 575

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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 = "1.6.3"

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version = "1.5.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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class PGPEngine(object):

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

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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

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

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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

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if proc.returncode != 0:

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raise PGPError(err)

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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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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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

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

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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", "expires",

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

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"last_approval_request", "last_checked_ok",

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

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

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approval_delay": "0s",

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"approval_duration": "1s",

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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, server_settings=None):

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def __init__(self, settings, name = 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", None) is not None:

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

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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", None) is not None:

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

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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):

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

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

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# would inevitably timeout, since no checker would get a

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

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

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

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# client would inevitably timeout, since no checker would get

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# a 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)

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except AttributeError:

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pass

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except OSError as error:

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if error.errno != errno.ECHILD:

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raise

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except (AttributeError, OSError) as error:

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if (isinstance(error, OSError)

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and error.errno != errno.ECHILD):

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raise error

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else:

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if pid:

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logger.warning("Checker was a zombie")

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self.current_checker_command)

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# Start a new checker if needed

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if self.checker is None:

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# Escape attributes for the shell

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escaped_attrs = dict(

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

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for attr in

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self.runtime_expansions)

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try:

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command = self.checker_command % escaped_attrs

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except TypeError as error:

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

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self.checker_command, exc_info=error)

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return True # Try again later

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# In case checker_command has exactly one % operator

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command = self.checker_command % self.host

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except TypeError:

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# Escape attributes for the shell

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escaped_attrs = dict(

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(attr,

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

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errors=

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'replace')))

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for attr in

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self.runtime_expansions)

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try:

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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

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self.current_checker_command = command

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try:

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

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

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

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# always replaced by /dev/null.)

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# The exception is when not debugging but nevertheless

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# running in the foreground; use the previously

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# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

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popen_args.update({"stdout": wnull,

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"stderr": wnull })

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self.checker = subprocess.Popen(command,

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close_fds=True,

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shell=True, cwd="/",

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**popen_args)

712

shell=True, cwd="/")

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self.checker_callback_tag = (gobject.child_watch_add

714

(self.checker.pid,

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self.checker_callback,

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data=command))

717

# The checker may have completed before the gobject

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# watch was added. Check for this.

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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)

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except OSError as error:

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724

logger.error("Failed to start subprocess",

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exc_info=error)

740

return True

741

self.checker_callback_tag = (gobject.child_watch_add

742

(self.checker.pid,

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self.checker_callback,

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data=command))

745

# The checker may have completed before the gobject

746

# watch was added. Check for this.

747

try:

748

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

749

except OSError as error:

750

if error.errno == errno.ECHILD:

751

# This should never happen

752

logger.error("Child process vanished",

753

exc_info=error)

754

return True

755

raise

756

if pid:

757

gobject.source_remove(self.checker_callback_tag)

758

self.checker_callback(pid, status, command)

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726

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

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return True

761

728

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901

# The byte_arrays option is not supported yet on

935

902

# signatures other than "ay".

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903

if prop._dbus_signature != "ay":

937

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

938

"'ay' signature {0!r}"

939

.format(prop._dbus_signature))

904

raise ValueError

940

905

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

941

906

for byte in value))

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907

prop(value)

1014

979

tag.appendChild(ann_tag)

1015

980

# Add interface annotation tags

1016

981

for annotation, value in dict(

1017

itertools.chain.from_iterable(

1018

annotations().iteritems()

1019

for name, annotations in

1020

self._get_all_dbus_things("interface")

1021

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

1022

)).iteritems():

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():

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988

ann_tag = document.createElement("annotation")

1024

989

ann_tag.setAttribute("name", annotation)

1025

990

ann_tag.setAttribute("value", value)

1048

1013

return xmlstring

1049

1014

1050

1015

1051

def datetime_to_dbus(dt, variant_level=0):

1016

def datetime_to_dbus (dt, variant_level=0):

1052

1017

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

1053

1018

if dt is None:

1054

1019

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

1062

1027

interface names according to the "alt_interface_names" mapping.

1063

1028

Usage:

1064

1029

1065

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

1066

"net.example.AlternateInterface"})

1030

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

1031

"net.example.AlternateInterface"})

1067

1032

class SampleDBusObject(dbus.service.Object):

1068

1033

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

1069

1034

def SampleDBusMethod():

1100

1065

interface_names.add(alt_interface)

1101

1066

# Is this a D-Bus signal?

1102

1067

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

1103

# Extract the original non-method undecorated

1104

# function by black magic

1068

# Extract the original non-method function by

1069

# black magic

1105

1070

nonmethod_func = (dict(

1106

1071

zip(attribute.func_code.co_freevars,

1107

1072

attribute.__closure__))["func"]

1368

1333

return False

1369

1334

1370

1335

def approve(self, value=True):

1336

self.send_changedstate()

1371

1337

self.approved = value

1372

1338

gobject.timeout_add(timedelta_to_milliseconds

1373

1339

(self.approval_duration),

1374

1340

self._reset_approved)

1375

self.send_changedstate()

1376

1341

1377

1342

## D-Bus methods, signals & properties

1378

1343

_interface = "se.recompile.Mandos.Client"

1562

1527

def Timeout_dbus_property(self, value=None):

1563

1528

if value is None: # get

1564

1529

return dbus.UInt64(self.timeout_milliseconds())

1565

old_timeout = self.timeout

1566

1530

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

1567

# Reschedule disabling

1531

# Reschedule timeout

1568

1532

if self.enabled:

1569

1533

now = datetime.datetime.utcnow()

1570

self.expires += self.timeout - old_timeout

1571

if self.expires <= now:

1534

time_to_die = timedelta_to_milliseconds(

1535

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

1536

if time_to_die <= 0:

1572

1537

# The timeout has passed

1573

1538

self.disable()

1574

1539

else:

1540

self.expires = (now +

1541

datetime.timedelta(milliseconds =

1542

time_to_die))

1575

1543

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

1576

1544

is None):

1577

1545

return

1578

1546

gobject.source_remove(self.disable_initiator_tag)

1579

self.disable_initiator_tag = (

1580

gobject.timeout_add(

1581

timedelta_to_milliseconds(self.expires - now),

1582

self.disable))

1547

self.disable_initiator_tag = (gobject.timeout_add

1548

(time_to_die,

1549

self.disable))

1583

1550

1584

1551

# ExtendedTimeout - property

1585

1552

@dbus_service_property(_interface, signature="t",

1705

1672

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

1706

1673

try:

1707

1674

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

1708

raise RuntimeError(line)

1675

raise RuntimeError

1709

1676

except (ValueError, IndexError, RuntimeError) as error:

1710

1677

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

1711

1678

return

1773

1740

#wait until timeout or approved

1774

1741

time = datetime.datetime.now()

1775

1742

client.changedstate.acquire()

1776

client.changedstate.wait(

1777

float(timedelta_to_milliseconds(delay)

1778

/ 1000))

1743

(client.changedstate.wait

1744

(float(client.timedelta_to_milliseconds(delay)

1745

/ 1000)))

1779

1746

client.changedstate.release()

1780

1747

time2 = datetime.datetime.now()

1781

1748

if (time2 - time) >= delay:

1897

1864

def process_request(self, request, address):

1898

1865

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

1899

1866

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

1900

args = (request, address))

1867

args = (request,

1868

address))

1901

1869

proc.start()

1902

1870

return proc

1903

1871

1918

1886

1919

1887

def add_pipe(self, parent_pipe, proc):

1920

1888

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

1921

raise NotImplementedError()

1889

raise NotImplementedError

1922

1890

1923

1891

1924

1892

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1931

1899

use_ipv6: Boolean; to use IPv6 or not

1932

1900

"""

1933

1901

def __init__(self, server_address, RequestHandlerClass,

1934

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

1935

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

1936

creating a new one with socket.socket().

1937

"""

1902

interface=None, use_ipv6=True):

1938

1903

self.interface = interface

1939

1904

if use_ipv6:

1940

1905

self.address_family = socket.AF_INET6

1941

if socketfd is not None:

1942

# Save the file descriptor

1943

self.socketfd = socketfd

1944

# Save the original socket.socket() function

1945

self.socket_socket = socket.socket

1946

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

1947

#

1948

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

1949

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

1950

# patching socket.socket.)

1951

#

1952

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

1953

@functools.wraps(socket.socket)

1954

def socket_wrapper(*args, **kwargs):

1955

# Restore original function so subsequent calls are

1956

# not affected.

1957

socket.socket = self.socket_socket

1958

del self.socket_socket

1959

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

1960

# saved file descriptor.

1961

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

1962

# Replace socket.socket() function with wrapper

1963

socket.socket = socket_wrapper

1964

# The socketserver.TCPServer.__init__ will call

1965

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

1966

# socket_wrapper(), if socketfd was set.

1967

1906

socketserver.TCPServer.__init__(self, server_address,

1968

1907

RequestHandlerClass)

1969

1970

1908

def server_bind(self):

1971

1909

"""This overrides the normal server_bind() function

1972

1910

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

1980

1918

try:

1981

1919

self.socket.setsockopt(socket.SOL_SOCKET,

1982

1920

SO_BINDTODEVICE,

1983

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

1921

str(self.interface

1922

+ '\0'))

1984

1923

except socket.error as error:

1985

if error.errno == errno.EPERM:

1986

logger.error("No permission to bind to"

1987

" interface %s", self.interface)

1988

elif error.errno == errno.ENOPROTOOPT:

1924

if error[0] == errno.EPERM:

1925

logger.error("No permission to"

1926

" bind to interface %s",

1927

self.interface)

1928

elif error[0] == errno.ENOPROTOOPT:

1989

1929

logger.error("SO_BINDTODEVICE not available;"

1990

1930

" cannot bind to interface %s",

1991

1931

self.interface)

1992

elif error.errno == errno.ENODEV:

1993

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

1994

" cannot bind", self.interface)

1995

1932

else:

1996

1933

raise

1997

1934

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

2000

1937

if self.address_family == socket.AF_INET6:

2001

1938

any_address = "::" # in6addr_any

2002

1939

else:

2003

any_address = "0.0.0.0" # INADDR_ANY

1940

any_address = socket.INADDR_ANY

2004

1941

self.server_address = (any_address,

2005

1942

self.server_address[1])

2006

1943

elif not self.server_address[1]:

2027

1964

"""

2028

1965

def __init__(self, server_address, RequestHandlerClass,

2029

1966

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

2030

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

1967

gnutls_priority=None, use_dbus=True):

2031

1968

self.enabled = False

2032

1969

self.clients = clients

2033

1970

if self.clients is None:

2037

1974

IPv6_TCPServer.__init__(self, server_address,

2038

1975

RequestHandlerClass,

2039

1976

interface = interface,

2040

use_ipv6 = use_ipv6,

2041

socketfd = socketfd)

1977

use_ipv6 = use_ipv6)

2042

1978

def server_activate(self):

2043

1979

if self.enabled:

2044

1980

return socketserver.TCPServer.server_activate(self)

2057

1993

2058

1994

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

2059

1995

proc = None, client_object=None):

1996

condition_names = {

1997

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

1998

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

1999

# blocking).

2000

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

2001

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

2002

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

2003

# broken, usually for pipes and

2004

# sockets).

2005

}

2006

conditions_string = ' | '.join(name

2007

for cond, name in

2008

condition_names.iteritems()

2009

if cond & condition)

2060

2010

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

2061

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

2011

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

2062

2012

# Wait for other process to exit

2063

2013

proc.join()

2064

2014

return False

2122

2072

return True

2123

2073

2124

2074

2125

def rfc3339_duration_to_delta(duration):

2126

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

2127

2128

>>> rfc3339_duration_to_delta("P7D")

2129

datetime.timedelta(7)

2130

>>> rfc3339_duration_to_delta("PT60S")

2131

datetime.timedelta(0, 60)

2132

>>> rfc3339_duration_to_delta("PT60M")

2133

datetime.timedelta(0, 3600)

2134

>>> rfc3339_duration_to_delta("PT24H")

2135

datetime.timedelta(1)

2136

>>> rfc3339_duration_to_delta("P1W")

2137

datetime.timedelta(7)

2138

>>> rfc3339_duration_to_delta("PT5M30S")

2139

datetime.timedelta(0, 330)

2140

>>> rfc3339_duration_to_delta("P1DT3M20S")

2141

datetime.timedelta(1, 200)

2142

"""

2143

2144

# Parsing an RFC 3339 duration with regular expressions is not

2145

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

2146

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

2147

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

2148

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

2149

# avoid excessive use of external libraries.

2150

2151

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

2152

Token = collections.namedtuple("Token",

2153

("regexp", # To match token; if

2154

# "value" is not None,

2155

# must have a "group"

2156

# containing digits

2157

"value", # datetime.timedelta or

2158

# None

2159

"followers")) # Tokens valid after

2160

# this token

2161

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

2162

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

2163

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

2164

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

2165

datetime.timedelta(seconds=1),

2166

frozenset((token_end,)))

2167

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

2168

datetime.timedelta(minutes=1),

2169

frozenset((token_second, token_end)))

2170

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

2171

datetime.timedelta(hours=1),

2172

frozenset((token_minute, token_end)))

2173

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

2174

None,

2175

frozenset((token_hour, token_minute,

2176

token_second)))

2177

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

2178

datetime.timedelta(days=1),

2179

frozenset((token_time, token_end)))

2180

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

2181

datetime.timedelta(weeks=4),

2182

frozenset((token_day, token_end)))

2183

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

2184

datetime.timedelta(weeks=52),

2185

frozenset((token_month, token_end)))

2186

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

2187

datetime.timedelta(weeks=1),

2188

frozenset((token_end,)))

2189

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

2190

frozenset((token_year, token_month,

2191

token_day, token_time,

2192

token_week))),

2193

# Define starting values

2194

value = datetime.timedelta() # Value so far

2195

found_token = None

2196

followers = frozenset(token_duration,) # Following valid tokens

2197

s = duration # String left to parse

2198

# Loop until end token is found

2199

while found_token is not token_end:

2200

# Search for any currently valid tokens

2201

for token in followers:

2202

match = token.regexp.match(s)

2203

if match is not None:

2204

# Token found

2205

if token.value is not None:

2206

# Value found, parse digits

2207

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

2208

# Add to value so far

2209

value += factor * token.value

2210

# Strip token from string

2211

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

2212

# Go to found token

2213

found_token = token

2214

# Set valid next tokens

2215

followers = found_token.followers

2216

break

2217

else:

2218

# No currently valid tokens were found

2219

raise ValueError("Invalid RFC 3339 duration")

2220

# End token found

2221

return value

2222

2223

2224

2075

def string_to_delta(interval):

2225

2076

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

2226

2077

2237

2088

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

2238

2089

datetime.timedelta(0, 330)

2239

2090

"""

2240

2241

try:

2242

return rfc3339_duration_to_delta(interval)

2243

except ValueError:

2244

pass

2245

2246

2091

timevalue = datetime.timedelta(0)

2247

2092

for s in interval.split():

2248

2093

try:

2261

2106

else:

2262

2107

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

2263

2108

.format(suffix))

2264

except IndexError as e:

2109

except (ValueError, IndexError) as e:

2265

2110

raise ValueError(*(e.args))

2266

2111

timevalue += delta

2267

2112

return timevalue

2311

2156

help="Run self-test")

2312

2157

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

2313

2158

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

2314

" to terminal", default=None)

2159

" to terminal")

2315

2160

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

2316

2161

help="Debug level for stdout output")

2317

2162

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

2324

2169

" files")

2325

2170

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

2326

2171

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

2327

" system bus interface", default=None)

2172

" system bus interface")

2328

2173

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

2329

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

2330

default=None)

2174

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

2331

2175

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

2332

2176

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

2333

" state", default=None)

2334

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

2335

help="Specify a file descriptor to a network"

2336

" socket to use instead of creating one")

2177

" state")

2337

2178

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

2338

2179

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

2339

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

2340

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

2341

2180

2342

2181

options = parser.parse_args()

2343

2182

2344

2183

if options.check:

2345

2184

import doctest

2346

fail_count, test_count = doctest.testmod()

2347

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

2185

doctest.testmod()

2186

sys.exit()

2348

2187

2349

2188

# Default values for config file for server-global settings

2350

2189

server_defaults = { "interface": "",

2352

2191

"port": "",

2353

2192

"debug": "False",

2354

2193

"priority":

2355

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

2194

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

2356

2195

"servicename": "Mandos",

2357

2196

"use_dbus": "True",

2358

2197

"use_ipv6": "True",

2359

2198

"debuglevel": "",

2360

2199

"restore": "True",

2361

"socket": "",

2362

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

2363

"foreground": "False",

2200

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

2364

2201

}

2365

2202

2366

2203

# Parse config file for server-global settings

2371

2208

# Convert the SafeConfigParser object to a dict

2372

2209

server_settings = server_config.defaults()

2373

2210

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

2374

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

2211

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

2375

2212

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

2376

2213

option)

2377

2214

if server_settings["port"]:

2378

2215

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

2379

2216

"port")

2380

if server_settings["socket"]:

2381

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

2382

"socket")

2383

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

2384

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

2385

# happen with a supplied network socket.

2386

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

2387

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

2388

["socket"])

2389

2217

del server_config

2390

2218

2391

2219

# Override the settings from the config file with command line

2393

2221

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

2394

2222

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

2395

2223

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

2396

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

2224

"statedir"):

2397

2225

value = getattr(options, option)

2398

2226

if value is not None:

2399

2227

server_settings[option] = value

2402

2230

for option in server_settings.keys():

2403

2231

if type(server_settings[option]) is str:

2404

2232

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

2405

# Force all boolean options to be boolean

2406

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

2407

"foreground"):

2408

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

2409

# Debug implies foreground

2410

if server_settings["debug"]:

2411

server_settings["foreground"] = True

2412

2233

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

2413

2234

2414

2235

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

2420

2241

use_ipv6 = server_settings["use_ipv6"]

2421

2242

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

2422

2243

stored_state_file)

2423

foreground = server_settings["foreground"]

2424

2244

2425

2245

if debug:

2426

2246

initlogger(debug, logging.DEBUG)

2455

2275

use_ipv6=use_ipv6,

2456

2276

gnutls_priority=

2457

2277

server_settings["priority"],

2458

use_dbus=use_dbus,

2459

socketfd=(server_settings["socket"]

2460

or None))

2461

if not foreground:

2462

pidfilename = "/run/mandos.pid"

2463

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

2464

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

2465

pidfile = None

2278

use_dbus=use_dbus)

2279

if not debug:

2280

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

2466

2281

try:

2467

2282

pidfile = open(pidfilename, "w")

2468

2283

except IOError as e:

2483

2298

os.setgid(gid)

2484

2299

os.setuid(uid)

2485

2300

except OSError as error:

2486

if error.errno != errno.EPERM:

2487

raise

2301

if error[0] != errno.EPERM:

2302

raise error

2488

2303

2489

2304

if debug:

2490

2305

# Enable all possible GnuTLS debugging

2507

2322

os.close(null)

2508

2323

2509

2324

# Need to fork before connecting to D-Bus

2510

if not foreground:

2325

if not debug:

2511

2326

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

2512

2327

daemon()

2513

2328

2514

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

2515

# need to inform gobject that threads will be used.

2516

2329

gobject.threads_init()

2517

2330

2518

2331

global main_loop

2553

2366

old_client_settings = {}

2554

2367

clients_data = {}

2555

2368

2556

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

2557

global wnull

2558

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

2559

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

2560

# mode

2561

if debug or not foreground:

2562

wnull.close()

2563

2564

2369

# Get client data and settings from last running state.

2565

2370

if server_settings["restore"]:

2566

2371

try:

2582

2387

2583

2388

with PGPEngine() as pgp:

2584

2389

for client_name, client in clients_data.iteritems():

2585

# Skip removed clients

2586

if client_name not in client_settings:

2587

continue

2588

2589

2390

# Decide which value to use after restoring saved state.

2590

2391

# We have three different values: Old config file,

2591

2392

# new config file, and saved state.

2653

2454

# Create all client objects

2654

2455

for client_name, client in clients_data.iteritems():

2655

2456

tcp_server.clients[client_name] = client_class(

2656

name = client_name, settings = client,

2657

server_settings = server_settings)

2457

name = client_name, settings = client)

2658

2458

2659

2459

if not tcp_server.clients:

2660

2460

logger.warning("No clients defined")

2661

2461

2662

if not foreground:

2663

if pidfile is not None:

2664

try:

2665

with pidfile:

2666

pid = os.getpid()

2667

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

2668

except IOError:

2669

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

2670

pidfilename, pid)

2671

del pidfile

2462

if not debug:

2463

try:

2464

with pidfile:

2465

pid = os.getpid()

2466

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

2467

del pidfile

2468

except IOError:

2469

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

2470

pidfilename, pid)

2471

except NameError:

2472

# "pidfile" was never created

2473

pass

2672

2474

del pidfilename

2475

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

2673

2476

2674

2477

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

2675

2478

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

2743

2546

service.cleanup()

2744

2547

2745

2548

multiprocessing.active_children()

2746

wnull.close()

2747

2549

if not (tcp_server.clients or client_settings):

2748

2550

return

2749

2551

2761

2563

# A list of attributes that can not be pickled

2762

2564

# + secret.

2763

2565

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

2764

"checker", "server_settings"))

2566

"checker"))

2765

2567

for name, typ in (inspect.getmembers

2766

2568

(dbus.service.Object)):

2767

2569

exclude.add(name)

2776

2578

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

2777

2579

2778

2580

try:

2779

with (tempfile.NamedTemporaryFile

2780

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

2781

dir=os.path.dirname(stored_state_path),

2782

delete=False)) as stored_state:

2581

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

2582

prefix="clients-",

2583

dir=os.path.dirname

2584

(stored_state_path))

2585

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

2783

2586

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

2784

tempname=stored_state.name

2785

2587

os.rename(tempname, stored_state_path)

2786

2588

except (IOError, OSError) as e:

2787

2589

if not debug:

2795

2597

else:

2796

2598

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

2797

2599

exc_info=e)

2798

raise

2600

raise e

2799

2601

2800

2602

# Delete all clients, and settings from config

2801

2603

while tcp_server.clients: