/mandos/release : revision 292

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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 types

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import binascii

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import tempfile

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import itertools

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import dbus

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import dbus.service

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.3"

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version = "1.5.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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def encrypt(self, data, password):

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

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

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with open(os.devnull) 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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def decrypt(self, data, password):

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

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

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with open(os.devnull) 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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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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return decrypted_plaintext

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class AvahiError(Exception):

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def __init__(self, value, *args, **kwargs):

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self.value = value

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server: D-Bus Server

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bus: dbus.SystemBus()

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"""

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def __init__(self, interface = avahi.IF_UNSPEC, name = None,

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servicetype = None, port = None, TXT = None,

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domain = "", host = "", max_renames = 32768,

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self.server = None

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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"""Derived from the Avahi example code"""

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if self.rename_count >= self.max_renames:

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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

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logger.critical("DBusException: %s", error)

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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def remove(self):

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"""Derived from the Avahi example code"""

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if self.entry_group_state_changed_match is not None:

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self.entry_group_state_changed_match = None

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if self.group is not None:

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self.group.Reset()

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def add(self):

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"""Derived from the Avahi example code"""

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self.remove()

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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self.group.Commit()

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def entry_group_state_changed(self, state, error):

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"""Derived from the Avahi example code"""

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logger.debug("Avahi entry group state change: %i", state)

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elif state == avahi.ENTRY_GROUP_FAILURE:

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logger.critical("Avahi: Error in group state changed %s",

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unicode(error))

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raise AvahiGroupError("State changed: {0!s}"

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.format(error))

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raise AvahiGroupError("State changed: %s"

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% unicode(error))

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def cleanup(self):

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"""Derived from the Avahi example code"""

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if self.group is not None:

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pass

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self.group = None

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self.remove()

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def server_state_changed(self, state, error=None):

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"""Derived from the Avahi example code"""

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logger.debug("Avahi server state change: %i", state)

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logger.debug("Unknown state: %r", state)

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else:

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logger.debug("Unknown state: %r: %r", state, error)

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def activate(self):

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"""Derived from the Avahi example code"""

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if self.server is None:

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({0}) [%(process)d]:'

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' %(levelname)s: %(message)s'

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.format(self.name)))

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('Mandos (%s) [%%(process)d]:'

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' %%(levelname)s: %%(message)s'

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% 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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last_checked_ok: datetime.datetime(); (UTC) or None

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

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checker, -2 means no checker completed yet.

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checker, or None.

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last_enabled: datetime.datetime(); (UTC) or None

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name: string; from the config file, used in log messages and

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D-Bus identifiers

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secret: bytestring; sent verbatim (over TLS) to client

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timeout: datetime.timedelta(); How long from last_checked_ok

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until this client is disabled

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extended_timeout: extra long timeout when secret has been sent

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extended_timeout: extra long timeout when password has been sent

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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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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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"""Construct a new dict of client settings of this form:

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"rb") as secfile:

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client["secret"] = secfile.read()

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else:

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raise TypeError("No secret or secfile for section {0}"

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.format(section))

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raise TypeError("No secret or secfile for section %s"

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% section)

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client["timeout"] = string_to_delta(section["timeout"])

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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client["checker_command"] = section["checker"]

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = -2

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client["last_checker_status"] = None

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return settings

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

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"""Note: the 'checker' key in 'config' sets the

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'checker_command' attribute and *not* the 'checker'

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attribute."""

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self.name = name

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# adding all client settings

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for setting, value in settings.iteritems():

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else:

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self.last_enabled = None

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self.expires = None

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logger.debug("Creating client %r", self.name)

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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

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

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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self.checker = None

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self.checker_initiator_tag = None

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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

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if getattr(self, "disable_initiator_tag", 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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logger.warning("Checker for %(name)s crashed?",

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vars(self))

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def checked_ok(self):

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"""Assert that the client has been seen, alive and well."""

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self.last_checked_ok = datetime.datetime.utcnow()

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self.last_checker_status = 0

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self.bump_timeout()

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def bump_timeout(self, timeout=None):

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"""Bump up the timeout for this client."""

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def checked_ok(self, timeout=None):

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"""Bump up the timeout for this client.

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This should only be called when the client has been seen,

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alive and well.

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"""

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if timeout is None:

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timeout = self.timeout

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self.last_checked_ok = datetime.datetime.utcnow()

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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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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

700

except TypeError as error:

701

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

702

self.checker_command, exc_info=error)

703

return True # Try again later

679

# In case checker_command has exactly one % operator

680

command = self.checker_command % self.host

681

except TypeError:

682

# Escape attributes for the shell

683

escaped_attrs = dict(

684

(attr,

685

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

686

errors=

687

'replace')))

688

for attr in

689

self.runtime_expansions)

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try:

692

command = self.checker_command % escaped_attrs

693

except TypeError as error:

694

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

695

' %s', self.checker_command, error)

696

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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self.checker = subprocess.Popen(command,

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close_fds=True,

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shell=True, cwd="/")

708

self.checker_callback_tag = (gobject.child_watch_add

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(self.checker.pid,

710

self.checker_callback,

711

data=command))

712

# The checker may have completed before the gobject

713

# watch was added. Check for this.

714

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

715

if pid:

716

gobject.source_remove(self.checker_callback_tag)

717

self.checker_callback(pid, status, command)

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718

except OSError as error:

716

logger.error("Failed to start subprocess",

717

exc_info=error)

718

self.checker_callback_tag = (gobject.child_watch_add

719

(self.checker.pid,

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self.checker_callback,

721

data=command))

722

# The checker may have completed before the gobject

723

# watch was added. Check for this.

724

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

725

if pid:

726

gobject.source_remove(self.checker_callback_tag)

727

self.checker_callback(pid, status, command)

719

logger.error("Failed to start subprocess: %s",

720

error)

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

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722

return True

730

723

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730

return

738

731

logger.debug("Stopping checker for %(name)s", vars(self))

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732

try:

740

self.checker.terminate()

733

os.kill(self.checker.pid, signal.SIGTERM)

741

734

#time.sleep(0.5)

742

735

#if self.checker.poll() is None:

743

# self.checker.kill()

736

# os.kill(self.checker.pid, signal.SIGKILL)

744

737

except OSError as error:

745

738

if error.errno != errno.ESRCH: # No such process

746

739

raise

763

756

# "Set" method, so we fail early here:

764

757

if byte_arrays and signature != "ay":

765

758

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

766

" signature {0!r}".format(signature))

759

" signature %r" % signature)

767

760

def decorator(func):

768

761

func._dbus_is_property = True

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762

func._dbus_interface = dbus_interface

777

770

return decorator

778

771

779

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780

def dbus_interface_annotations(dbus_interface):

781

"""Decorator for marking functions returning interface annotations

782

783

Usage:

784

785

@dbus_interface_annotations("org.example.Interface")

786

def _foo(self): # Function name does not matter

787

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

788

"org.freedesktop.DBus.Property.EmitsChangedSignal":

789

"false"}

790

"""

791

def decorator(func):

792

func._dbus_is_interface = True

793

func._dbus_interface = dbus_interface

794

func._dbus_name = dbus_interface

795

return func

796

return decorator

797

798

799

def dbus_annotations(annotations):

800

"""Decorator to annotate D-Bus methods, signals or properties

801

Usage:

802

803

@dbus_service_property("org.example.Interface", signature="b",

804

access="r")

805

@dbus_annotations({{"org.freedesktop.DBus.Deprecated": "true",

806

"org.freedesktop.DBus.Property."

807

"EmitsChangedSignal": "false"})

808

def Property_dbus_property(self):

809

return dbus.Boolean(False)

810

"""

811

def decorator(func):

812

func._dbus_annotations = annotations

813

return func

814

return decorator

815

816

817

773

class DBusPropertyException(dbus.exceptions.DBusException):

818

774

"""A base class for D-Bus property-related exceptions

819

775

"""

842

798

"""

843

799

844

800

@staticmethod

845

def _is_dbus_thing(thing):

846

"""Returns a function testing if an attribute is a D-Bus thing

847

848

If called like _is_dbus_thing("method") it returns a function

849

suitable for use as predicate to inspect.getmembers().

850

"""

851

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

852

False)

801

def _is_dbus_property(obj):

802

return getattr(obj, "_dbus_is_property", False)

853

803

854

def _get_all_dbus_things(self, thing):

804

def _get_all_dbus_properties(self):

855

805

"""Returns a generator of (name, attribute) pairs

856

806

"""

857

return ((getattr(athing.__get__(self), "_dbus_name",

858

name),

859

athing.__get__(self))

807

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

860

808

for cls in self.__class__.__mro__

861

for name, athing in

862

inspect.getmembers(cls,

863

self._is_dbus_thing(thing)))

809

for name, prop in

810

inspect.getmembers(cls, self._is_dbus_property))

864

811

865

812

def _get_dbus_property(self, interface_name, property_name):

866

813

"""Returns a bound method if one exists which is a D-Bus

868

815

"""

869

816

for cls in self.__class__.__mro__:

870

817

for name, value in (inspect.getmembers

871

(cls,

872

self._is_dbus_thing("property"))):

818

(cls, self._is_dbus_property)):

873

819

if (value._dbus_name == property_name

874

820

and value._dbus_interface == interface_name):

875

821

return value.__get__(self)

917

863

Note: Will not include properties with access="write".

918

864

"""

919

865

properties = {}

920

for name, prop in self._get_all_dbus_things("property"):

866

for name, prop in self._get_all_dbus_properties():

921

867

if (interface_name

922

868

and interface_name != prop._dbus_interface):

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869

# Interface non-empty but did not match

938

884

path_keyword='object_path',

939

885

connection_keyword='connection')

940

886

def Introspect(self, object_path, connection):

941

"""Overloading of standard D-Bus method.

942

943

Inserts property tags and interface annotation tags.

887

"""Standard D-Bus method, overloaded to insert property tags.

944

888

"""

945

889

xmlstring = dbus.service.Object.Introspect(self, object_path,

946

890

connection)

953

897

e.setAttribute("access", prop._dbus_access)

954

898

return e

955

899

for if_tag in document.getElementsByTagName("interface"):

956

# Add property tags

957

900

for tag in (make_tag(document, name, prop)

958

901

for name, prop

959

in self._get_all_dbus_things("property")

902

in self._get_all_dbus_properties()

960

903

if prop._dbus_interface

961

904

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

962

905

if_tag.appendChild(tag)

963

# Add annotation tags

964

for typ in ("method", "signal", "property"):

965

for tag in if_tag.getElementsByTagName(typ):

966

annots = dict()

967

for name, prop in (self.

968

_get_all_dbus_things(typ)):

969

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

970

and prop._dbus_interface

971

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

972

annots.update(getattr

973

(prop,

974

"_dbus_annotations",

975

{}))

976

for name, value in annots.iteritems():

977

ann_tag = document.createElement(

978

"annotation")

979

ann_tag.setAttribute("name", name)

980

ann_tag.setAttribute("value", value)

981

tag.appendChild(ann_tag)

982

# Add interface annotation tags

983

for annotation, value in dict(

984

itertools.chain.from_iterable(

985

annotations().iteritems()

986

for name, annotations in

987

self._get_all_dbus_things("interface")

988

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

989

)).iteritems():

990

ann_tag = document.createElement("annotation")

991

ann_tag.setAttribute("name", annotation)

992

ann_tag.setAttribute("value", value)

993

if_tag.appendChild(ann_tag)

994

906

# Add the names to the return values for the

995

907

# "org.freedesktop.DBus.Properties" methods

996

908

if (if_tag.getAttribute("name")

1011

923

except (AttributeError, xml.dom.DOMException,

1012

924

xml.parsers.expat.ExpatError) as error:

1013

925

logger.error("Failed to override Introspection method",

1014

exc_info=error)

926

error)

1015

927

return xmlstring

1016

928

1017

929

1023

935

variant_level=variant_level)

1024

936

1025

937

1026

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1027

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

1028

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

1029

interface names according to the "alt_interface_names" mapping.

1030

Usage:

1031

1032

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

1033

"net.example.AlternateInterface"})

1034

class SampleDBusObject(dbus.service.Object):

1035

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

1036

def SampleDBusMethod():

1037

pass

1038

1039

The above "SampleDBusMethod" on "SampleDBusObject" will be

1040

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

1041

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

1042

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

1043

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

1044

1045

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

1046

(from DBusObjectWithProperties) and interfaces (from the

1047

dbus_interface_annotations decorator).

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

939

.__metaclass__):

940

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

941

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

1048

942

"""

1049

def wrapper(cls):

1050

for orig_interface_name, alt_interface_name in (

1051

alt_interface_names.iteritems()):

1052

attr = {}

1053

interface_names = set()

1054

# Go though all attributes of the class

1055

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

943

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

944

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

945

# methods, signals, or properties in them

946

for base in (b for b in bases

947

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

948

# Go though all attributes of the base class

949

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

1056

950

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

1057

951

# with the wrong interface name

1058

952

if (not hasattr(attribute, "_dbus_interface")

1059

953

or not attribute._dbus_interface

1060

.startswith(orig_interface_name)):

954

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

1061

955

continue

1062

956

# Create an alternate D-Bus interface name based on

1063

957

# the current name

1064

958

alt_interface = (attribute._dbus_interface

1065

.replace(orig_interface_name,

1066

alt_interface_name))

1067

interface_names.add(alt_interface)

959

.replace("se.recompile.Mandos",

960

"se.bsnet.fukt.Mandos"))

1068

961

# Is this a D-Bus signal?

1069

962

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

1070

963

# Extract the original non-method function by

1085

978

nonmethod_func.func_name,

1086

979

nonmethod_func.func_defaults,

1087

980

nonmethod_func.func_closure)))

1088

# Copy annotations, if any

1089

try:

1090

new_function._dbus_annotations = (

1091

dict(attribute._dbus_annotations))

1092

except AttributeError:

1093

pass

1094

981

# Define a creator of a function to call both the

1095

# original and alternate functions, so both the

1096

# original and alternate signals gets sent when

1097

# the function is called

982

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

983

# signals gets sent when the function is called

1098

984

def fixscope(func1, func2):

1099

985

"""This function is a scope container to pass

1100

986

func1 and func2 to the "call_both" function

1107

993

return call_both

1108

994

# Create the "call_both" function and add it to

1109

995

# the class

1110

attr[attrname] = fixscope(attribute, new_function)

996

attr[attrname] = fixscope(attribute,

997

new_function)

1111

998

# Is this a D-Bus method?

1112

999

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

1113

1000

# Create a new, but exactly alike, function

1124

1011

attribute.func_name,

1125

1012

attribute.func_defaults,

1126

1013

attribute.func_closure)))

1127

# Copy annotations, if any

1128

try:

1129

attr[attrname]._dbus_annotations = (

1130

dict(attribute._dbus_annotations))

1131

except AttributeError:

1132

pass

1133

1014

# Is this a D-Bus property?

1134

1015

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

1135

1016

# Create a new, but exactly alike, function

1149

1030

attribute.func_name,

1150

1031

attribute.func_defaults,

1151

1032

attribute.func_closure)))

1152

# Copy annotations, if any

1153

try:

1154

attr[attrname]._dbus_annotations = (

1155

dict(attribute._dbus_annotations))

1156

except AttributeError:

1157

pass

1158

# Is this a D-Bus interface?

1159

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

1160

# Create a new, but exactly alike, function

1161

# object. Decorate it to be a new D-Bus interface

1162

# with the alternate D-Bus interface name. Add it

1163

# to the class.

1164

attr[attrname] = (dbus_interface_annotations

1165

(alt_interface)

1166

(types.FunctionType

1167

(attribute.func_code,

1168

attribute.func_globals,

1169

attribute.func_name,

1170

attribute.func_defaults,

1171

attribute.func_closure)))

1172

if deprecate:

1173

# Deprecate all alternate interfaces

1174

iname="_AlternateDBusNames_interface_annotation{0}"

1175

for interface_name in interface_names:

1176

@dbus_interface_annotations(interface_name)

1177

def func(self):

1178

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

1179

"true" }

1180

# Find an unused name

1181

for aname in (iname.format(i)

1182

for i in itertools.count()):

1183

if aname not in attr:

1184

attr[aname] = func

1185

break

1186

if interface_names:

1187

# Replace the class with a new subclass of it with

1188

# methods, signals, etc. as created above.

1189

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

1190

(cls,), attr)

1191

return cls

1192

return wrapper

1193

1194

1195

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

1196

"se.bsnet.fukt.Mandos"})

1033

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

1034

1035

1197

1036

class ClientDBus(Client, DBusObjectWithProperties):

1198

1037

"""A Client class using D-Bus

1199

1038

1210

1049

def __init__(self, bus = None, *args, **kwargs):

1211

1050

self.bus = bus

1212

1051

Client.__init__(self, *args, **kwargs)

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

1213

1055

# Only now, when this client is initialized, can it show up on

1214

1056

# the D-Bus

1215

1057

client_object_name = unicode(self.name).translate(

1219

1061

("/clients/" + client_object_name))

1220

1062

DBusObjectWithProperties.__init__(self, self.bus,

1221

1063

self.dbus_object_path)

1222

1064

1223

1065

def notifychangeproperty(transform_func,

1224

1066

dbus_name, type_func=lambda x: x,

1225

1067

variant_level=1):

1248

1090

1249

1091

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

1250

1092

1093

1251

1094

expires = notifychangeproperty(datetime_to_dbus, "Expires")

1252

1095

approvals_pending = notifychangeproperty(dbus.Boolean,

1253

1096

"ApprovalPending",

1260

1103

checker is not None)

1261

1104

last_checked_ok = notifychangeproperty(datetime_to_dbus,

1262

1105

"LastCheckedOK")

1263

last_checker_status = notifychangeproperty(dbus.Int16,

1264

"LastCheckerStatus")

1265

1106

last_approval_request = notifychangeproperty(

1266

1107

datetime_to_dbus, "LastApprovalRequest")

1267

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1335

1176

return False

1336

1177

1337

1178

def approve(self, value=True):

1179

self.send_changedstate()

1338

1180

self.approved = value

1339

1181

gobject.timeout_add(timedelta_to_milliseconds

1340

1182

(self.approval_duration),

1341

1183

self._reset_approved)

1342

self.send_changedstate()

1184

1343

1185

1344

1186

## D-Bus methods, signals & properties

1345

1187

_interface = "se.recompile.Mandos.Client"

1346

1188

1347

## Interfaces

1348

1349

@dbus_interface_annotations(_interface)

1350

def _foo(self):

1351

return { "org.freedesktop.DBus.Property.EmitsChangedSignal":

1352

"false"}

1353

1354

1189

## Signals

1355

1190

1356

1191

# CheckerCompleted - signal

1392

1227

"D-Bus signal"

1393

1228

return self.need_approval()

1394

1229

1230

# NeRwequest - signal

1231

@dbus.service.signal(_interface, signature="s")

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

1395

1238

## Methods

1396

1239

1397

1240

# Approve - method

1507

1350

return

1508

1351

return datetime_to_dbus(self.last_checked_ok)

1509

1352

1510

# LastCheckerStatus - property

1511

@dbus_service_property(_interface, signature="n",

1512

access="read")

1513

def LastCheckerStatus_dbus_property(self):

1514

return dbus.Int16(self.last_checker_status)

1515

1516

1353

# Expires - property

1517

1354

@dbus_service_property(_interface, signature="s", access="read")

1518

1355

def Expires_dbus_property(self):

1529

1366

def Timeout_dbus_property(self, value=None):

1530

1367

if value is None: # get

1531

1368

return dbus.UInt64(self.timeout_milliseconds())

1532

old_timeout = self.timeout

1533

1369

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

1534

# Reschedule disabling

1370

# Reschedule timeout

1535

1371

if self.enabled:

1536

1372

now = datetime.datetime.utcnow()

1537

self.expires += self.timeout - old_timeout

1538

if self.expires <= now:

1373

time_to_die = timedelta_to_milliseconds(

1374

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

1375

if time_to_die <= 0:

1539

1376

# The timeout has passed

1540

1377

self.disable()

1541

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1542

1382

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

1543

1383

is None):

1544

1384

return

1545

1385

gobject.source_remove(self.disable_initiator_tag)

1546

self.disable_initiator_tag = (

1547

gobject.timeout_add(

1548

timedelta_to_milliseconds(self.expires - now),

1549

self.disable))

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1550

1389

1551

1390

# ExtendedTimeout - property

1552

1391

@dbus_service_property(_interface, signature="t",

1631

1470

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

1632

1471

1633

1472

1473

class ClientDBusTransitional(ClientDBus):

1474

__metaclass__ = AlternateDBusNamesMetaclass

1475

1476

1634

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1635

1478

"""A class to handle client connections.

1636

1479

1704

1547

except KeyError:

1705

1548

return

1706

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1707

1554

if client.approval_delay:

1708

1555

delay = client.approval_delay

1709

1556

client.approvals_pending += 1

1740

1587

#wait until timeout or approved

1741

1588

time = datetime.datetime.now()

1742

1589

client.changedstate.acquire()

1743

client.changedstate.wait(

1744

float(timedelta_to_milliseconds(delay)

1745

/ 1000))

1590

(client.changedstate.wait

1591

(float(client.timedelta_to_milliseconds(delay)

1592

/ 1000)))

1746

1593

client.changedstate.release()

1747

1594

time2 = datetime.datetime.now()

1748

1595

if (time2 - time) >= delay:

1764

1611

try:

1765

1612

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

1766

1613

except gnutls.errors.GNUTLSError as error:

1767

logger.warning("gnutls send failed",

1768

exc_info=error)

1614

logger.warning("gnutls send failed")

1769

1615

return

1770

1616

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

1771

1617

sent, len(client.secret)

1774

1620

1775

1621

logger.info("Sending secret to %s", client.name)

1776

1622

# bump the timeout using extended_timeout

1777

client.bump_timeout(client.extended_timeout)

1623

client.checked_ok(client.extended_timeout)

1778

1624

if self.server.use_dbus:

1779

1625

# Emit D-Bus signal

1780

1626

client.GotSecret()

1785

1631

try:

1786

1632

session.bye()

1787

1633

except gnutls.errors.GNUTLSError as error:

1788

logger.warning("GnuTLS bye failed",

1789

exc_info=error)

1634

logger.warning("GnuTLS bye failed")

1790

1635

1791

1636

@staticmethod

1792

1637

def peer_certificate(session):

1864

1709

def process_request(self, request, address):

1865

1710

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

1866

1711

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

1867

args = (request, address))

1712

args = (request,

1713

address))

1868

1714

proc.start()

1869

1715

return proc

1870

1716

1920

1766

str(self.interface

1921

1767

+ '\0'))

1922

1768

except socket.error as error:

1923

if error.errno == errno.EPERM:

1769

if error[0] == errno.EPERM:

1924

1770

logger.error("No permission to"

1925

1771

" bind to interface %s",

1926

1772

self.interface)

1927

elif error.errno == errno.ENOPROTOOPT:

1773

elif error[0] == errno.ENOPROTOOPT:

1928

1774

logger.error("SO_BINDTODEVICE not available;"

1929

1775

" cannot bind to interface %s",

1930

1776

self.interface)

1931

elif error.errno == errno.ENODEV:

1932

logger.error("Interface %s does not"

1933

" exist, cannot bind",

1934

self.interface)

1935

1777

else:

1936

1778

raise

1937

1779

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

1996

1838

1997

1839

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

1998

1840

proc = None, client_object=None):

1841

condition_names = {

1842

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

1843

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

1844

# blocking).

1845

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

1846

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

1847

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

1848

# broken, usually for pipes and

1849

# sockets).

1850

}

1851

conditions_string = ' | '.join(name

1852

for cond, name in

1853

condition_names.iteritems()

1854

if cond & condition)

1999

1855

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

2000

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

1856

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

2001

1857

# Wait for other process to exit

2002

1858

proc.join()

2003

1859

return False

2093

1949

elif suffix == "w":

2094

1950

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

2095

1951

else:

2096

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

2097

.format(suffix))

1952

raise ValueError("Unknown suffix %r" % suffix)

2098

1953

except (ValueError, IndexError) as e:

2099

1954

raise ValueError(*(e.args))

2100

1955

timevalue += delta

2114

1969

sys.exit()

2115

1970

if not noclose:

2116

1971

# Close all standard open file descriptors

2117

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

1972

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2118

1973

if not stat.S_ISCHR(os.fstat(null).st_mode):

2119

1974

raise OSError(errno.ENODEV,

2120

"{0} not a character device"

2121

.format(os.devnull))

1975

"%s not a character device"

1976

% os.path.devnull)

2122

1977

os.dup2(null, sys.stdin.fileno())

2123

1978

os.dup2(null, sys.stdout.fileno())

2124

1979

os.dup2(null, sys.stderr.fileno())

2133

1988

2134

1989

parser = argparse.ArgumentParser()

2135

1990

parser.add_argument("-v", "--version", action="version",

2136

version = "%(prog)s {0}".format(version),

1991

version = "%%(prog)s %s" % version,

2137

1992

help="show version number and exit")

2138

1993

parser.add_argument("-i", "--interface", metavar="IF",

2139

1994

help="Bind to interface IF")

2242

2097

2243

2098

if server_settings["servicename"] != "Mandos":

2244

2099

syslogger.setFormatter(logging.Formatter

2245

('Mandos ({0}) [%(process)d]:'

2246

' %(levelname)s: %(message)s'

2247

.format(server_settings

2248

["servicename"])))

2100

('Mandos (%s) [%%(process)d]:'

2101

' %%(levelname)s: %%(message)s'

2102

% server_settings["servicename"]))

2249

2103

2250

2104

# Parse config file with clients

2251

2105

client_config = configparser.SafeConfigParser(Client

2269

2123

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

2270

2124

try:

2271

2125

pidfile = open(pidfilename, "w")

2272

except IOError as e:

2273

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

2274

exc_info=e)

2126

except IOError:

2127

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

2275

2128

2276

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

2129

try:

2130

uid = pwd.getpwnam("_mandos").pw_uid

2131

gid = pwd.getpwnam("_mandos").pw_gid

2132

except KeyError:

2277

2133

try:

2278

uid = pwd.getpwnam(name).pw_uid

2279

gid = pwd.getpwnam(name).pw_gid

2280

break

2134

uid = pwd.getpwnam("mandos").pw_uid

2135

gid = pwd.getpwnam("mandos").pw_gid

2281

2136

except KeyError:

2282

continue

2283

else:

2284

uid = 65534

2285

gid = 65534

2137

try:

2138

uid = pwd.getpwnam("nobody").pw_uid

2139

gid = pwd.getpwnam("nobody").pw_gid

2140

except KeyError:

2141

uid = 65534

2142

gid = 65534

2286

2143

try:

2287

2144

os.setgid(gid)

2288

2145

os.setuid(uid)

2289

2146

except OSError as error:

2290

if error.errno != errno.EPERM:

2147

if error[0] != errno.EPERM:

2291

2148

raise error

2292

2149

2293

2150

if debug:

2305

2162

.gnutls_global_set_log_function(debug_gnutls))

2306

2163

2307

2164

# Redirect stdin so all checkers get /dev/null

2308

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

2165

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

2309

2166

os.dup2(null, sys.stdin.fileno())

2310

2167

if null > 2:

2311

2168

os.close(null)

2319

2176

2320

2177

global main_loop

2321

2178

# From the Avahi example code

2322

DBusGMainLoop(set_as_default=True)

2179

DBusGMainLoop(set_as_default=True )

2323

2180

main_loop = gobject.MainLoop()

2324

2181

bus = dbus.SystemBus()

2325

2182

# End of Avahi example code

2331

2188

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

2332

2189

do_not_queue=True))

2333

2190

except dbus.exceptions.NameExistsException as e:

2334

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

2191

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

2335

2192

use_dbus = False

2336

2193

server_settings["use_dbus"] = False

2337

2194

tcp_server.use_dbus = False

2349

2206

2350

2207

client_class = Client

2351

2208

if use_dbus:

2352

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

2209

client_class = functools.partial(ClientDBusTransitional,

2210

bus = bus)

2353

2211

2354

2212

client_settings = Client.config_parser(client_config)

2355

2213

old_client_settings = {}

2363

2221

(stored_state))

2364

2222

os.remove(stored_state_path)

2365

2223

except IOError as e:

2366

if e.errno == errno.ENOENT:

2367

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

2368

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

2369

else:

2370

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

2371

exc_info=e)

2224

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

2225

.format(e))

2226

if e.errno != errno.ENOENT:

2372

2227

raise

2373

2228

except EOFError as e:

2374

2229

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

2375

"EOFError:", exc_info=e)

2230

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

2376

2231

2377

2232

with PGPEngine() as pgp:

2378

2233

for client_name, client in clients_data.iteritems():

2395

2250

2396

2251

# Clients who has passed its expire date can still be

2397

2252

# enabled if its last checker was successful. Clients

2398

# whose checker succeeded before we stored its state is

2399

# assumed to have successfully run all checkers during

2400

# downtime.

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2401

2255

if client["enabled"]:

2402

2256

if datetime.datetime.utcnow() >= client["expires"]:

2403

2257

if not client["last_checked_ok"]:

2404

2258

logger.warning(

2405

2259

"disabling client {0} - Client never "

2406

"performed a successful checker"

2407

.format(client_name))

2260

"performed a successfull checker"

2261

.format(client["name"]))

2408

2262

client["enabled"] = False

2409

2263

elif client["last_checker_status"] != 0:

2410

2264

logger.warning(

2411

2265

"disabling client {0} - Client "

2412

2266

"last checker failed with error code {1}"

2413

.format(client_name,

2267

.format(client["name"],

2414

2268

client["last_checker_status"]))

2415

2269

client["enabled"] = False

2416

2270

else:

2419

2273

+ client["timeout"])

2420

2274

logger.debug("Last checker succeeded,"

2421

2275

" keeping {0} enabled"

2422

.format(client_name))

2276

.format(client["name"]))

2423

2277

try:

2424

2278

client["secret"] = (

2425

2279

pgp.decrypt(client["encrypted_secret"],

2431

2285

.format(client_name))

2432

2286

client["secret"] = (

2433

2287

client_settings[client_name]["secret"])

2288

2434

2289

2435

2290

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

2436

2291

for client_name in (set(old_client_settings)

2439

2294

for client_name in (set(client_settings)

2440

2295

- set(old_client_settings)):

2441

2296

clients_data[client_name] = client_settings[client_name]

2442

2443

# Create all client objects

2297

2298

# Create clients all clients

2444

2299

for client_name, client in clients_data.iteritems():

2445

2300

tcp_server.clients[client_name] = client_class(

2446

2301

name = client_name, settings = client)

2447

2302

2448

2303

if not tcp_server.clients:

2449

2304

logger.warning("No clients defined")

2450

2305

2451

2306

if not debug:

2452

2307

try:

2453

2308

with pidfile:

2467

2322

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

2468

2323

2469

2324

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

class MandosDBusService(DBusObjectWithProperties):

2325

class MandosDBusService(dbus.service.Object):

2473

2326

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

2474

2327

def __init__(self):

2475

2328

dbus.service.Object.__init__(self, bus, "/")

2476

2329

_interface = "se.recompile.Mandos"

2477

2330

2478

@dbus_interface_annotations(_interface)

2479

def _foo(self):

2480

return { "org.freedesktop.DBus.Property"

2481

".EmitsChangedSignal":

2482

"false"}

2483

2484

2331

@dbus.service.signal(_interface, signature="o")

2485

2332

def ClientAdded(self, objpath):

2486

2333

"D-Bus signal"

2528

2375

2529

2376

del _interface

2530

2377

2531

mandos_dbus_service = MandosDBusService()

2378

class MandosDBusServiceTransitional(MandosDBusService):

2379

__metaclass__ = AlternateDBusNamesMetaclass

2380

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2381

2533

2382

def cleanup():

2534

2383

"Cleanup function; run on exit"

2567

2416

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

2568

2417

2569

2418

try:

2570

with (tempfile.NamedTemporaryFile

2571

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

2572

dir=os.path.dirname(stored_state_path),

2573

delete=False)) as stored_state:

2419

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

2420

prefix="clients-",

2421

dir=os.path.dirname

2422

(stored_state_path))

2423

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

2574

2424

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

2575

tempname=stored_state.name

2576

2425

os.rename(tempname, stored_state_path)

2577

2426

except (IOError, OSError) as e:

2427

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

2428

.format(e))

2578

2429

if not debug:

2579

2430

try:

2580

2431

os.remove(tempname)

2581

2432

except NameError:

2582

2433

pass

2583

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

2584

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

2585

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

2586

else:

2587

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

2588

exc_info=e)

2434

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

2435

errno.EEXIST)):

2589

2436

raise e

2590

2437

2591

2438

# Delete all clients, and settings from config

2619

2466

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

2620

2467

if use_ipv6:

2621

2468

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

2622

" flowinfo %d, scope_id %d",

2623

*tcp_server.socket.getsockname())

2469

" flowinfo %d, scope_id %d"

2470

% tcp_server.socket.getsockname())

2624

2471

else: # IPv4

2625

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

2626

*tcp_server.socket.getsockname())

2472

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

2473

% tcp_server.socket.getsockname())

2627

2474

2628

2475

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

2629

2476

2632

2479

try:

2633

2480

service.activate()

2634

2481

except dbus.exceptions.DBusException as error:

2635

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

2482

logger.critical("DBusException: %s", error)

2636

2483

cleanup()

2637

2484

sys.exit(1)

2638

2485

# End of Avahi example code

2645

2492

logger.debug("Starting main loop")

2646

2493

main_loop.run()

2647

2494

except AvahiError as error:

2648

logger.critical("Avahi Error", exc_info=error)

2495

logger.critical("AvahiError: %s", error)

2649

2496

cleanup()

2650

2497

sys.exit(1)

2651

2498

except KeyboardInterrupt: