/mandos/release : revision 237.7.122

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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 = "1.6.2"

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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

532

if server_settings is None:

533

server_settings = {}

534

self.server_settings = server_settings

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518

# adding all client settings

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for setting, value in settings.iteritems():

537

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setattr(self, setting, value)

587

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

588

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# Already enabled

589

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return

573

self.send_changedstate()

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

591

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self.enabled = True

592

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self.last_enabled = datetime.datetime.utcnow()

593

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self.init_checker()

594

self.send_changedstate()

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596

579

def disable(self, quiet=True):

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"""Disable this client."""

598

581

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

599

582

return False

600

583

if not quiet:

584

self.send_changedstate()

585

if not quiet:

601

586

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

602

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

587

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

603

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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

606

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

591

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

607

592

gobject.source_remove(self.checker_initiator_tag)

608

593

self.checker_initiator_tag = None

609

594

self.stop_checker()

610

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self.enabled = False

611

if not quiet:

612

self.send_changedstate()

613

596

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

614

597

return False

615

598

619

602

def init_checker(self):

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

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604

# and every interval from then on.

622

if self.checker_initiator_tag is not None:

623

gobject.source_remove(self.checker_initiator_tag)

624

605

self.checker_initiator_tag = (gobject.timeout_add

625

606

(self.interval_milliseconds(),

626

607

self.start_checker))

627

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

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

630

609

self.disable_initiator_tag = (gobject.timeout_add

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610

(self.timeout_milliseconds(),

632

611

self.disable))

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timeout = self.timeout

664

643

if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

666

self.disable_initiator_tag = None

667

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

668

646

self.disable_initiator_tag = (gobject.timeout_add

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647

(timedelta_to_milliseconds

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657

If a checker already exists, leave it running and do

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658

nothing."""

681

659

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

682

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

683

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

684

# would inevitably timeout, since no checker would get a

685

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

660

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

661

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

662

# client would inevitably timeout, since no checker would get

663

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

686

664

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

687

665

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

688

666

# should be.

690

668

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

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669

try:

692

670

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

693

except AttributeError:

694

pass

695

except OSError as error:

696

if error.errno != errno.ECHILD:

697

raise

671

except (AttributeError, OSError) as error:

672

if (isinstance(error, OSError)

673

and error.errno != errno.ECHILD):

674

raise error

698

675

else:

699

676

if pid:

700

677

logger.warning("Checker was a zombie")

703

680

self.current_checker_command)

704

681

# Start a new checker if needed

705

682

if self.checker is None:

706

# Escape attributes for the shell

707

escaped_attrs = dict(

708

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

709

for attr in

710

self.runtime_expansions)

711

683

try:

712

command = self.checker_command % escaped_attrs

713

except TypeError as error:

714

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

715

self.checker_command, exc_info=error)

716

return True # Try again later

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

717

702

self.current_checker_command = command

718

703

try:

719

704

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

722

707

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

723

708

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

724

709

# always replaced by /dev/null.)

725

# The exception is when not debugging but nevertheless

726

# running in the foreground; use the previously

727

# created wnull.

728

popen_args = {}

729

if (not self.server_settings["debug"]

730

and self.server_settings["foreground"]):

731

popen_args.update({"stdout": wnull,

732

"stderr": wnull })

733

710

self.checker = subprocess.Popen(command,

734

711

close_fds=True,

735

shell=True, cwd="/",

736

**popen_args)

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

723

except OSError as error:

738

724

logger.error("Failed to start subprocess",

739

725

exc_info=error)

740

return True

741

self.checker_callback_tag = (gobject.child_watch_add

742

(self.checker.pid,

743

self.checker_callback,

744

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)

759

726

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

760

727

return True

761

728

934

901

# The byte_arrays option is not supported yet on

935

902

# signatures other than "ay".

936

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))

942

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():

1023

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)

1056

1021

variant_level=variant_level)

1057

1022

1058

1023

1059

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1060

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

1061

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

1062

interface names according to the "alt_interface_names" mapping.

1063

Usage:

1064

1065

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

1066

"net.example.AlternateInterface"})

1067

class SampleDBusObject(dbus.service.Object):

1068

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

1069

def SampleDBusMethod():

1070

pass

1071

1072

The above "SampleDBusMethod" on "SampleDBusObject" will be

1073

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

1074

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

1075

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

1076

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

1077

1078

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

1079

(from DBusObjectWithProperties) and interfaces (from the

1080

dbus_interface_annotations decorator).

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.

1081

1028

"""

1082

def wrapper(cls):

1083

for orig_interface_name, alt_interface_name in (

1084

alt_interface_names.iteritems()):

1085

attr = {}

1086

interface_names = set()

1087

# Go though all attributes of the class

1088

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

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):

1089

1037

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

1090

1038

# with the wrong interface name

1091

1039

if (not hasattr(attribute, "_dbus_interface")

1092

1040

or not attribute._dbus_interface

1093

.startswith(orig_interface_name)):

1041

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

1094

1042

continue

1095

1043

# Create an alternate D-Bus interface name based on

1096

1044

# the current name

1097

1045

alt_interface = (attribute._dbus_interface

1098

.replace(orig_interface_name,

1099

alt_interface_name))

1100

interface_names.add(alt_interface)

1046

.replace("se.recompile.Mandos",

1047

"se.bsnet.fukt.Mandos"))

1048

if alt_interface != attribute._dbus_interface:

1049

old_interface_names.append(alt_interface)

1101

1050

# Is this a D-Bus signal?

1102

1051

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

1103

# Extract the original non-method undecorated

1104

# function by black magic

1052

# Extract the original non-method function by

1053

# black magic

1105

1054

nonmethod_func = (dict(

1106

1055

zip(attribute.func_code.co_freevars,

1107

1056

attribute.__closure__))["func"]

1125

1074

except AttributeError:

1126

1075

pass

1127

1076

# Define a creator of a function to call both the

1128

# original and alternate functions, so both the

1129

# original and alternate signals gets sent when

1130

# the function is called

1077

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

1078

# signals gets sent when the function is called

1131

1079

def fixscope(func1, func2):

1132

1080

"""This function is a scope container to pass

1133

1081

func1 and func2 to the "call_both" function

1140

1088

return call_both

1141

1089

# Create the "call_both" function and add it to

1142

1090

# the class

1143

attr[attrname] = fixscope(attribute, new_function)

1091

attr[attrname] = fixscope(attribute,

1092

new_function)

1144

1093

# Is this a D-Bus method?

1145

1094

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

1146

1095

# Create a new, but exactly alike, function

1202

1151

attribute.func_name,

1203

1152

attribute.func_defaults,

1204

1153

attribute.func_closure)))

1205

if deprecate:

1206

# Deprecate all alternate interfaces

1207

iname="_AlternateDBusNames_interface_annotation{0}"

1208

for interface_name in interface_names:

1209

@dbus_interface_annotations(interface_name)

1210

def func(self):

1211

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

1212

"true" }

1213

# Find an unused name

1214

for aname in (iname.format(i)

1215

for i in itertools.count()):

1216

if aname not in attr:

1217

attr[aname] = func

1218

break

1219

if interface_names:

1220

# Replace the class with a new subclass of it with

1221

# methods, signals, etc. as created above.

1222

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

1223

(cls,), attr)

1224

return cls

1225

return wrapper

1226

1227

1228

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

1229

"se.bsnet.fukt.Mandos"})

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

1230

1168

class ClientDBus(Client, DBusObjectWithProperties):

1231

1169

"""A Client class using D-Bus

1232

1170

1368

1306

return False

1369

1307

1370

1308

def approve(self, value=True):

1309

self.send_changedstate()

1371

1310

self.approved = value

1372

1311

gobject.timeout_add(timedelta_to_milliseconds

1373

1312

(self.approval_duration),

1374

1313

self._reset_approved)

1375

self.send_changedstate()

1376

1314

1377

1315

## D-Bus methods, signals & properties

1378

1316

_interface = "se.recompile.Mandos.Client"

1562

1500

def Timeout_dbus_property(self, value=None):

1563

1501

if value is None: # get

1564

1502

return dbus.UInt64(self.timeout_milliseconds())

1565

old_timeout = self.timeout

1566

1503

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

1567

# Reschedule disabling

1504

# Reschedule timeout

1568

1505

if self.enabled:

1569

1506

now = datetime.datetime.utcnow()

1570

self.expires += self.timeout - old_timeout

1571

if self.expires <= now:

1507

time_to_die = timedelta_to_milliseconds(

1508

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

1509

if time_to_die <= 0:

1572

1510

# The timeout has passed

1573

1511

self.disable()

1574

1512

else:

1513

self.expires = (now +

1514

datetime.timedelta(milliseconds =

1515

time_to_die))

1575

1516

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

1576

1517

is None):

1577

1518

return

1578

1519

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))

1520

self.disable_initiator_tag = (gobject.timeout_add

1521

(time_to_die,

1522

self.disable))

1583

1523

1584

1524

# ExtendedTimeout - property

1585

1525

@dbus_service_property(_interface, signature="t",

1664

1604

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

1665

1605

1666

1606

1607

class ClientDBusTransitional(ClientDBus):

1608

__metaclass__ = AlternateDBusNamesMetaclass

1609

1610

1667

1611

class ClientHandler(socketserver.BaseRequestHandler, object):

1668

1612

"""A class to handle client connections.

1669

1613

1705

1649

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

1706

1650

try:

1707

1651

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

1708

raise RuntimeError(line)

1652

raise RuntimeError

1709

1653

except (ValueError, IndexError, RuntimeError) as error:

1710

1654

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

1711

1655

return

1773

1717

#wait until timeout or approved

1774

1718

time = datetime.datetime.now()

1775

1719

client.changedstate.acquire()

1776

client.changedstate.wait(

1777

float(timedelta_to_milliseconds(delay)

1778

/ 1000))

1720

(client.changedstate.wait

1721

(float(client.timedelta_to_milliseconds(delay)

1722

/ 1000)))

1779

1723

client.changedstate.release()

1780

1724

time2 = datetime.datetime.now()

1781

1725

if (time2 - time) >= delay:

1897

1841

def process_request(self, request, address):

1898

1842

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

1899

1843

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

1900

args = (request, address))

1844

args = (request,

1845

address))

1901

1846

proc.start()

1902

1847

return proc

1903

1848

1918

1863

1919

1864

def add_pipe(self, parent_pipe, proc):

1920

1865

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

1921

raise NotImplementedError()

1866

raise NotImplementedError

1922

1867

1923

1868

1924

1869

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1931

1876

use_ipv6: Boolean; to use IPv6 or not

1932

1877

"""

1933

1878

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

"""

1879

interface=None, use_ipv6=True):

1938

1880

self.interface = interface

1939

1881

if use_ipv6:

1940

1882

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

1883

socketserver.TCPServer.__init__(self, server_address,

1968

1884

RequestHandlerClass)

1969

1970

1885

def server_bind(self):

1971

1886

"""This overrides the normal server_bind() function

1972

1887

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

1980

1895

try:

1981

1896

self.socket.setsockopt(socket.SOL_SOCKET,

1982

1897

SO_BINDTODEVICE,

1983

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

1898

str(self.interface

1899

+ '\0'))

1984

1900

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:

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:

1989

1906

logger.error("SO_BINDTODEVICE not available;"

1990

1907

" cannot bind to interface %s",

1991

1908

self.interface)

1992

elif error.errno == errno.ENODEV:

1993

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

1994

" cannot bind", self.interface)

1995

1909

else:

1996

1910

raise

1997

1911

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

2000

1914

if self.address_family == socket.AF_INET6:

2001

1915

any_address = "::" # in6addr_any

2002

1916

else:

2003

any_address = "0.0.0.0" # INADDR_ANY

1917

any_address = socket.INADDR_ANY

2004

1918

self.server_address = (any_address,

2005

1919

self.server_address[1])

2006

1920

elif not self.server_address[1]:

2027

1941

"""

2028

1942

def __init__(self, server_address, RequestHandlerClass,

2029

1943

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

2030

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

1944

gnutls_priority=None, use_dbus=True):

2031

1945

self.enabled = False

2032

1946

self.clients = clients

2033

1947

if self.clients is None:

2037

1951

IPv6_TCPServer.__init__(self, server_address,

2038

1952

RequestHandlerClass,

2039

1953

interface = interface,

2040

use_ipv6 = use_ipv6,

2041

socketfd = socketfd)

1954

use_ipv6 = use_ipv6)

2042

1955

def server_activate(self):

2043

1956

if self.enabled:

2044

1957

return socketserver.TCPServer.server_activate(self)

2057

1970

2058

1971

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

2059

1972

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)

2060

1987

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

2061

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

1988

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

2062

1989

# Wait for other process to exit

2063

1990

proc.join()

2064

1991

return False

2122

2049

return True

2123

2050

2124

2051

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

2052

def string_to_delta(interval):

2225

2053

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

2226

2054

2237

2065

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

2238

2066

datetime.timedelta(0, 330)

2239

2067

"""

2240

2241

try:

2242

return rfc3339_duration_to_delta(interval)

2243

except ValueError:

2244

pass

2245

2246

2068

timevalue = datetime.timedelta(0)

2247

2069

for s in interval.split():

2248

2070

try:

2261

2083

else:

2262

2084

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

2263

2085

.format(suffix))

2264

except IndexError as e:

2086

except (ValueError, IndexError) as e:

2265

2087

raise ValueError(*(e.args))

2266

2088

timevalue += delta

2267

2089

return timevalue

2311

2133

help="Run self-test")

2312

2134

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

2313

2135

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

2314

" to terminal", default=None)

2136

" to terminal")

2315

2137

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

2316

2138

help="Debug level for stdout output")

2317

2139

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

2324

2146

" files")

2325

2147

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

2326

2148

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

2327

" system bus interface", default=None)

2149

" system bus interface")

2328

2150

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

2329

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

2330

default=None)

2151

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

2331

2152

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

2332

2153

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")

2154

" state")

2337

2155

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

2338

2156

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

2339

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

2340

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

2341

2157

2342

2158

options = parser.parse_args()

2343

2159

2352

2168

"port": "",

2353

2169

"debug": "False",

2354

2170

"priority":

2355

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

2171

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

2356

2172

"servicename": "Mandos",

2357

2173

"use_dbus": "True",

2358

2174

"use_ipv6": "True",

2359

2175

"debuglevel": "",

2360

2176

"restore": "True",

2361

"socket": "",

2362

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

2363

"foreground": "False",

2177

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

2364

2178

}

2365

2179

2366

2180

# Parse config file for server-global settings

2371

2185

# Convert the SafeConfigParser object to a dict

2372

2186

server_settings = server_config.defaults()

2373

2187

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

2374

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

2188

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

2375

2189

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

2376

2190

option)

2377

2191

if server_settings["port"]:

2378

2192

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

2379

2193

"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

2194

del server_config

2390

2195

2391

2196

# Override the settings from the config file with command line

2393

2198

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

2394

2199

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

2395

2200

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

2396

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

2201

"statedir"):

2397

2202

value = getattr(options, option)

2398

2203

if value is not None:

2399

2204

server_settings[option] = value

2402

2207

for option in server_settings.keys():

2403

2208

if type(server_settings[option]) is str:

2404

2209

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

2210

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

2413

2211

2414

2212

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

2420

2218

use_ipv6 = server_settings["use_ipv6"]

2421

2219

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

2422

2220

stored_state_file)

2423

foreground = server_settings["foreground"]

2424

2221

2425

2222

if debug:

2426

2223

initlogger(debug, logging.DEBUG)

2455

2252

use_ipv6=use_ipv6,

2456

2253

gnutls_priority=

2457

2254

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

2255

use_dbus=use_dbus)

2256

if not debug:

2257

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

2466

2258

try:

2467

2259

pidfile = open(pidfilename, "w")

2468

2260

except IOError as e:

2483

2275

os.setgid(gid)

2484

2276

os.setuid(uid)

2485

2277

except OSError as error:

2486

if error.errno != errno.EPERM:

2487

raise

2278

if error[0] != errno.EPERM:

2279

raise error

2488

2280

2489

2281

if debug:

2490

2282

# Enable all possible GnuTLS debugging

2507

2299

os.close(null)

2508

2300

2509

2301

# Need to fork before connecting to D-Bus

2510

if not foreground:

2302

if not debug:

2511

2303

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

2512

2304

daemon()

2513

2305

2514

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

2515

# need to inform gobject that threads will be used.

2516

2306

gobject.threads_init()

2517

2307

2518

2308

global main_loop

2547

2337

2548

2338

client_class = Client

2549

2339

if use_dbus:

2550

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

2340

client_class = functools.partial(ClientDBusTransitional,

2341

bus = bus)

2551

2342

2552

2343

client_settings = Client.config_parser(client_config)

2553

2344

old_client_settings = {}

2554

2345

clients_data = {}

2555

2346

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

2347

# Get client data and settings from last running state.

2565

2348

if server_settings["restore"]:

2566

2349

try:

2582

2365

2583

2366

with PGPEngine() as pgp:

2584

2367

for client_name, client in clients_data.iteritems():

2585

# Skip removed clients

2586

if client_name not in client_settings:

2587

continue

2588

2589

2368

# Decide which value to use after restoring saved state.

2590

2369

# We have three different values: Old config file,

2591

2370

# new config file, and saved state.

2653

2432

# Create all client objects

2654

2433

for client_name, client in clients_data.iteritems():

2655

2434

tcp_server.clients[client_name] = client_class(

2656

name = client_name, settings = client,

2657

server_settings = server_settings)

2435

name = client_name, settings = client)

2658

2436

2659

2437

if not tcp_server.clients:

2660

2438

logger.warning("No clients defined")

2661

2439

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

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

2672

2452

del pidfilename

2453

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

2673

2454

2674

2455

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

2675

2456

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

2676

2457

2677

2458

if use_dbus:

2678

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

2679

"se.bsnet.fukt.Mandos"})

2680

2459

class MandosDBusService(DBusObjectWithProperties):

2681

2460

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

2682

2461

def __init__(self):

2736

2515

2737

2516

del _interface

2738

2517

2739

mandos_dbus_service = MandosDBusService()

2518

class MandosDBusServiceTransitional(MandosDBusService):

2519

__metaclass__ = AlternateDBusNamesMetaclass

2520

mandos_dbus_service = MandosDBusServiceTransitional()

2740

2521

2741

2522

def cleanup():

2742

2523

"Cleanup function; run on exit"

2743

2524

service.cleanup()

2744

2525

2745

2526

multiprocessing.active_children()

2746

wnull.close()

2747

2527

if not (tcp_server.clients or client_settings):

2748

2528

return

2749

2529

2761

2541

# A list of attributes that can not be pickled

2762

2542

# + secret.

2763

2543

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

2764

"checker", "server_settings"))

2544

"checker"))

2765

2545

for name, typ in (inspect.getmembers

2766

2546

(dbus.service.Object)):

2767

2547

exclude.add(name)

2776

2556

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

2777

2557

2778

2558

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:

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:

2783

2564

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

2784

tempname=stored_state.name

2785

2565

os.rename(tempname, stored_state_path)

2786

2566

except (IOError, OSError) as e:

2787

2567

if not debug:

2795

2575

else:

2796

2576

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

2797

2577

exc_info=e)

2798

raise

2578

raise e

2799

2579

2800

2580

# Delete all clients, and settings from config

2801

2581

while tcp_server.clients: