/mandos/trunk : revision 454

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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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import fcntl

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import functools

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import cPickle as pickle

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import multiprocessing

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import dbus

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import dbus.service

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SO_BINDTODEVICE = None

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version = "1.0.14"

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version = "1.2.1"

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#logger = logging.getLogger(u'mandos')

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logger = logging.Logger(u'mandos')

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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u" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError(u"Too many renames")

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self.name = self.server.GetAlternativeServiceName(self.name)

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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logger.info(u"Changing Zeroconf service name to %r ...",

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unicode(self.name))

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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self.add()

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try:

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self.add()

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except dbus.exceptions.DBusException, error:

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logger.critical(u"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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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(u"Avahi state change: %i", state)

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

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if state == avahi.ENTRY_GROUP_ESTABLISHED:

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logger.debug(u"Zeroconf service established.")

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self.group = None

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def server_state_changed(self, state):

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

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

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if state == avahi.SERVER_COLLISION:

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logger.error(u"Zeroconf server name collision")

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self.remove()

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"""A representation of a client host served by this server.

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Attributes:

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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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_approved: bool(); 'None' if not yet approved/disapproved

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approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

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checker: subprocess.Popen(); a running checker process used

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to see if the client lives.

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'None' if no process is running.

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checker_callback_tag: a gobject event source tag, or None

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checker_command: string; External command which is run to check

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if client lives. %() expansions are done at

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runtime with vars(self) as dict, so that for

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instance %(name)s can be used in the command.

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checker_initiator_tag: a gobject event source tag, or None

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created: datetime.datetime(); (UTC) object creation

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current_checker_command: string; current running checker_command

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disable_hook: If set, called by disable() as disable_hook(self)

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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fingerprint: string (40 or 32 hexadecimal digits); used to

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uniquely identify the client

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

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host: string; available for use by the checker command

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created: datetime.datetime(); (UTC) object creation

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interval: datetime.timedelta(); How often to start a new checker

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

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

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last_enabled: datetime.datetime(); (UTC)

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enabled: bool()

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last_checked_ok: 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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interval: datetime.timedelta(); How often to start a new checker

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disable_hook: If set, called by disable() as disable_hook(self)

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checker: subprocess.Popen(); a running checker process used

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to see if the client lives.

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'None' if no process is running.

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checker_initiator_tag: a gobject event source tag, or None

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disable_initiator_tag: - '' -

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checker_callback_tag: - '' -

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checker_command: string; External command which is run to check if

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client lives. %() expansions are done at

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runtime with vars(self) as dict, so that for

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instance %(name)s can be used in the command.

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current_checker_command: string; current running checker_command

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runtime_expansions: Allowed attributes for runtime expansion.

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"""

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runtime_expansions = (u"approval_delay", u"approval_duration",

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

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

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

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@staticmethod

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return self._timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return self._timedelta_to_milliseconds(self.approval_delay)

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def __init__(self, name = None, disable_hook=None, config=None):

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

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self.host = config.get(u"host", u"")

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self.created = datetime.datetime.utcnow()

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self.enabled = False

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self.last_approval_request = None

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self.last_enabled = None

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self.last_checked_ok = None

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self.timeout = string_to_delta(config[u"timeout"])

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self.checker_command = config[u"checker"]

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self.current_checker_command = None

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self.last_connect = None

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self._approved = None

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self.approved_by_default = config.get(u"approved_by_default",

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True)

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self.approvals_pending = 0

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self.approval_delay = string_to_delta(

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config[u"approval_delay"])

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self.approval_duration = string_to_delta(

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config[u"approval_duration"])

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self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

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def send_changedstate(self):

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self.changedstate.acquire()

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self.changedstate.notify_all()

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self.changedstate.release()

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def enable(self):

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"""Start this client's checker and timeout hooks"""

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if getattr(self, u"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.last_enabled = datetime.datetime.utcnow()

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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 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(u"Disabling client %s", self.name)

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

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gobject.source_remove(self.disable_initiator_tag)

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(self.timeout_milliseconds(),

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self.disable))

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def need_approval(self):

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self.last_approval_request = datetime.datetime.utcnow()

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def start_checker(self):

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"""Start a new checker subprocess if one is not running.

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command = self.checker_command % self.host

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except TypeError:

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# Escape attributes for the shell

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escaped_attrs = dict((key,

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re.escape(unicode(str(val),

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errors=

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u'replace')))

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for key, val in

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vars(self).iteritems())

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escaped_attrs = dict(

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(attr,

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

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errors=

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u'replace')))

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for attr in

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self.runtime_expansions)

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try:

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command = self.checker_command % escaped_attrs

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except TypeError, error:

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raise

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self.checker = None

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def dbus_service_property(dbus_interface, signature=u"v",

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access=u"readwrite", byte_arrays=False):

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"""Decorators for marking methods of a DBusObjectWithProperties to

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dbus_object_path: dbus.ObjectPath

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bus: dbus.SystemBus()

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"""

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runtime_expansions = (Client.runtime_expansions

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+ (u"dbus_object_path",))

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# dbus.service.Object doesn't use super(), so we can't either.

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

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self._approvals_pending = 0

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self.bus = bus

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

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

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# the D-Bus

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client_object_name = unicode(self.name).translate(

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{ord(u"."): ord(u"_"),

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ord(u"-"): ord(u"_")})

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self.dbus_object_path = (dbus.ObjectPath

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(u"/clients/"

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+ self.name.replace(u".", u"_")))

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(u"/clients/" + client_object_name))

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DBusObjectWithProperties.__init__(self, self.bus,

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self.dbus_object_path)

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def _get_approvals_pending(self):

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return self._approvals_pending

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def _set_approvals_pending(self, value):

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old_value = self._approvals_pending

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self._approvals_pending = value

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bval = bool(value)

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if (hasattr(self, "dbus_object_path")

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and bval is not bool(old_value)):

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dbus_bool = dbus.Boolean(bval, variant_level=1)

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self.PropertyChanged(dbus.String(u"ApprovalPending"),

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dbus_bool)

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approvals_pending = property(_get_approvals_pending,

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_set_approvals_pending)

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del _get_approvals_pending, _set_approvals_pending

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@staticmethod

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def _datetime_to_dbus(dt, variant_level=0):

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r = Client.enable(self)

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if oldstate != self.enabled:

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# Emit D-Bus signals

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self.PropertyChanged(dbus.String(u"enabled"),

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self.PropertyChanged(dbus.String(u"Enabled"),

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dbus.Boolean(True, variant_level=1))

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self.PropertyChanged(

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dbus.String(u"last_enabled"),

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dbus.String(u"LastEnabled"),

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self._datetime_to_dbus(self.last_enabled,

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variant_level=1))

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return r

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r = Client.disable(self, quiet=quiet)

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if not quiet and oldstate != self.enabled:

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# Emit D-Bus signal

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self.PropertyChanged(dbus.String(u"enabled"),

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self.PropertyChanged(dbus.String(u"Enabled"),

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dbus.Boolean(False, variant_level=1))

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return r

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self.checker_callback_tag = None

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self.checker = None

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# Emit D-Bus signal

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self.PropertyChanged(dbus.String(u"checker_running"),

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self.PropertyChanged(dbus.String(u"CheckerRunning"),

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dbus.Boolean(False, variant_level=1))

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if os.WIFEXITED(condition):

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exitstatus = os.WEXITSTATUS(condition)

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

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# Emit D-Bus signal

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self.PropertyChanged(

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dbus.String(u"last_checked_ok"),

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dbus.String(u"LastCheckedOK"),

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(self._datetime_to_dbus(self.last_checked_ok,

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variant_level=1)))

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return r

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

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

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# Emit D-Bus signal

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self.PropertyChanged(

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dbus.String(u"LastApprovalRequest"),

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(self._datetime_to_dbus(self.last_approval_request,

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variant_level=1)))

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return r

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

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old_checker = self.checker

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if self.checker is not None:

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# Emit D-Bus signal

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self.CheckerStarted(self.current_checker_command)

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self.PropertyChanged(

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dbus.String(u"checker_running"),

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dbus.String(u"CheckerRunning"),

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dbus.Boolean(True, variant_level=1))

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return r

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

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if (old_checker is not None

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and getattr(self, u"checker", None) is None):

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self.PropertyChanged(dbus.String(u"checker_running"),

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self.PropertyChanged(dbus.String(u"CheckerRunning"),

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dbus.Boolean(False, variant_level=1))

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return r

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## D-Bus methods & signals

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def _reset_approved(self):

859

self._approved = None

860

return False

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def approve(self, value=True):

863

self.send_changedstate()

864

self._approved = value

865

gobject.timeout_add(self._timedelta_to_milliseconds

866

(self.approval_duration),

867

self._reset_approved)

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## D-Bus methods, signals & properties

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_interface = u"se.bsnet.fukt.Mandos.Client"

785

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786

# CheckedOK - method

787

@dbus.service.method(_interface)

788

def CheckedOK(self):

789

return self.checked_ok()

873

## Signals

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874

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# CheckerCompleted - signal

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

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893

# GotSecret - signal

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@dbus.service.signal(_interface)

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895

def GotSecret(self):

812

"D-Bus signal"

896

"""D-Bus signal

897

Is sent after a successful transfer of secret from the Mandos

898

server to mandos-client

899

"""

813

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pass

814

901

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902

# Rejected - signal

816

@dbus.service.signal(_interface)

817

def Rejected(self):

903

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

904

def Rejected(self, reason):

818

905

"D-Bus signal"

819

906

pass

820

907

908

# NeedApproval - signal

909

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

910

def NeedApproval(self, timeout, default):

911

"D-Bus signal"

912

return self.need_approval()

913

914

## Methods

915

916

# Approve - method

917

@dbus.service.method(_interface, in_signature=u"b")

918

def Approve(self, value):

919

self.approve(value)

920

921

# CheckedOK - method

922

@dbus.service.method(_interface)

923

def CheckedOK(self):

924

return self.checked_ok()

925

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# Enable - method

822

927

@dbus.service.method(_interface)

823

928

def Enable(self):

841

946

def StopChecker(self):

842

947

self.stop_checker()

843

948

844

# name - property

949

## Properties

950

951

# ApprovalPending - property

952

@dbus_service_property(_interface, signature=u"b", access=u"read")

953

def ApprovalPending_dbus_property(self):

954

return dbus.Boolean(bool(self.approvals_pending))

955

956

# ApprovedByDefault - property

957

@dbus_service_property(_interface, signature=u"b",

958

access=u"readwrite")

959

def ApprovedByDefault_dbus_property(self, value=None):

960

if value is None: # get

961

return dbus.Boolean(self.approved_by_default)

962

self.approved_by_default = bool(value)

963

# Emit D-Bus signal

964

self.PropertyChanged(dbus.String(u"ApprovedByDefault"),

965

dbus.Boolean(value, variant_level=1))

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967

# ApprovalDelay - property

968

@dbus_service_property(_interface, signature=u"t",

969

access=u"readwrite")

970

def ApprovalDelay_dbus_property(self, value=None):

971

if value is None: # get

972

return dbus.UInt64(self.approval_delay_milliseconds())

973

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

974

# Emit D-Bus signal

975

self.PropertyChanged(dbus.String(u"ApprovalDelay"),

976

dbus.UInt64(value, variant_level=1))

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# ApprovalDuration - property

979

@dbus_service_property(_interface, signature=u"t",

980

access=u"readwrite")

981

def ApprovalDuration_dbus_property(self, value=None):

982

if value is None: # get

983

return dbus.UInt64(self._timedelta_to_milliseconds(

984

self.approval_duration))

985

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

986

# Emit D-Bus signal

987

self.PropertyChanged(dbus.String(u"ApprovalDuration"),

988

dbus.UInt64(value, variant_level=1))

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# Name - property

845

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

846

def name_dbus_property(self):

992

def Name_dbus_property(self):

847

993

return dbus.String(self.name)

848

994

849

# fingerprint - property

995

# Fingerprint - property

850

996

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

851

def fingerprint_dbus_property(self):

997

def Fingerprint_dbus_property(self):

852

998

return dbus.String(self.fingerprint)

853

999

854

# host - property

1000

# Host - property

855

1001

@dbus_service_property(_interface, signature=u"s",

856

1002

access=u"readwrite")

857

def host_dbus_property(self, value=None):

1003

def Host_dbus_property(self, value=None):

858

1004

if value is None: # get

859

1005

return dbus.String(self.host)

860

1006

self.host = value

861

1007

# Emit D-Bus signal

862

self.PropertyChanged(dbus.String(u"host"),

1008

self.PropertyChanged(dbus.String(u"Host"),

863

1009

dbus.String(value, variant_level=1))

864

1010

865

# created - property

1011

# Created - property

866

1012

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

867

def created_dbus_property(self):

1013

def Created_dbus_property(self):

868

1014

return dbus.String(self._datetime_to_dbus(self.created))

869

1015

870

# last_enabled - property

1016

# LastEnabled - property

871

1017

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

872

def last_enabled_dbus_property(self):

1018

def LastEnabled_dbus_property(self):

873

1019

if self.last_enabled is None:

874

1020

return dbus.String(u"")

875

1021

return dbus.String(self._datetime_to_dbus(self.last_enabled))

876

1022

877

# enabled - property

1023

# Enabled - property

878

1024

@dbus_service_property(_interface, signature=u"b",

879

1025

access=u"readwrite")

880

def enabled_dbus_property(self, value=None):

1026

def Enabled_dbus_property(self, value=None):

881

1027

if value is None: # get

882

1028

return dbus.Boolean(self.enabled)

883

1029

if value:

885

1031

else:

886

1032

self.disable()

887

1033

888

# last_checked_ok - property

1034

# LastCheckedOK - property

889

1035

@dbus_service_property(_interface, signature=u"s",

890

1036

access=u"readwrite")

891

def last_checked_ok_dbus_property(self, value=None):

1037

def LastCheckedOK_dbus_property(self, value=None):

892

1038

if value is not None:

893

1039

self.checked_ok()

894

1040

return

897

1043

return dbus.String(self._datetime_to_dbus(self

898

1044

.last_checked_ok))

899

1045

900

# timeout - property

1046

# LastApprovalRequest - property

1047

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

1048

def LastApprovalRequest_dbus_property(self):

1049

if self.last_approval_request is None:

1050

return dbus.String(u"")

1051

return dbus.String(self.

1052

_datetime_to_dbus(self

1053

.last_approval_request))

1054

1055

# Timeout - property

901

1056

@dbus_service_property(_interface, signature=u"t",

902

1057

access=u"readwrite")

903

def timeout_dbus_property(self, value=None):

1058

def Timeout_dbus_property(self, value=None):

904

1059

if value is None: # get

905

1060

return dbus.UInt64(self.timeout_milliseconds())

906

1061

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

907

1062

# Emit D-Bus signal

908

self.PropertyChanged(dbus.String(u"timeout"),

1063

self.PropertyChanged(dbus.String(u"Timeout"),

909

1064

dbus.UInt64(value, variant_level=1))

910

1065

if getattr(self, u"disable_initiator_tag", None) is None:

911

1066

return

925

1080

self.disable_initiator_tag = (gobject.timeout_add

926

1081

(time_to_die, self.disable))

927

1082

928

# interval - property

1083

# Interval - property

929

1084

@dbus_service_property(_interface, signature=u"t",

930

1085

access=u"readwrite")

931

def interval_dbus_property(self, value=None):

1086

def Interval_dbus_property(self, value=None):

932

1087

if value is None: # get

933

1088

return dbus.UInt64(self.interval_milliseconds())

934

1089

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

935

1090

# Emit D-Bus signal

936

self.PropertyChanged(dbus.String(u"interval"),

1091

self.PropertyChanged(dbus.String(u"Interval"),

937

1092

dbus.UInt64(value, variant_level=1))

938

1093

if getattr(self, u"checker_initiator_tag", None) is None:

939

1094

return

943

1098

(value, self.start_checker))

944

1099

self.start_checker() # Start one now, too

945

1100

946

# checker - property

1101

# Checker - property

947

1102

@dbus_service_property(_interface, signature=u"s",

948

1103

access=u"readwrite")

949

def checker_dbus_property(self, value=None):

1104

def Checker_dbus_property(self, value=None):

950

1105

if value is None: # get

951

1106

return dbus.String(self.checker_command)

952

1107

self.checker_command = value

953

1108

# Emit D-Bus signal

954

self.PropertyChanged(dbus.String(u"checker"),

1109

self.PropertyChanged(dbus.String(u"Checker"),

955

1110

dbus.String(self.checker_command,

956

1111

variant_level=1))

957

1112

958

# checker_running - property

1113

# CheckerRunning - property

959

1114

@dbus_service_property(_interface, signature=u"b",

960

1115

access=u"readwrite")

961

def checker_running_dbus_property(self, value=None):

1116

def CheckerRunning_dbus_property(self, value=None):

962

1117

if value is None: # get

963

1118

return dbus.Boolean(self.checker is not None)

964

1119

if value:

966

1121

else:

967

1122

self.stop_checker()

968

1123

969

# object_path - property

1124

# ObjectPath - property

970

1125

@dbus_service_property(_interface, signature=u"o", access=u"read")

971

def object_path_dbus_property(self):

1126

def ObjectPath_dbus_property(self):

972

1127

return self.dbus_object_path # is already a dbus.ObjectPath

973

1128

974

# secret = property

1129

# Secret = property

975

1130

@dbus_service_property(_interface, signature=u"ay",

976

1131

access=u"write", byte_arrays=True)

977

def secret_dbus_property(self, value):

1132

def Secret_dbus_property(self, value):

978

1133

self.secret = str(value)

979

1134

980

1135

del _interface

981

1136

982

1137

1138

class ProxyClient(object):

1139

def __init__(self, child_pipe, fpr, address):

1140

self._pipe = child_pipe

1141

self._pipe.send(('init', fpr, address))

1142

if not self._pipe.recv():

1143

raise KeyError()

1144

1145

def __getattribute__(self, name):

1146

if(name == '_pipe'):

1147

return super(ProxyClient, self).__getattribute__(name)

1148

self._pipe.send(('getattr', name))

1149

data = self._pipe.recv()

1150

if data[0] == 'data':

1151

return data[1]

1152

if data[0] == 'function':

1153

def func(*args, **kwargs):

1154

self._pipe.send(('funcall', name, args, kwargs))

1155

return self._pipe.recv()[1]

1156

return func

1157

1158

def __setattr__(self, name, value):

1159

if(name == '_pipe'):

1160

return super(ProxyClient, self).__setattr__(name, value)

1161

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

1162

1163

983

1164

class ClientHandler(socketserver.BaseRequestHandler, object):

984

1165

"""A class to handle client connections.

985

1166

987

1168

Note: This will run in its own forked process."""

988

1169

989

1170

def handle(self):

990

logger.info(u"TCP connection from: %s",

991

unicode(self.client_address))

992

logger.debug(u"IPC Pipe FD: %d", self.server.child_pipe[1])

993

# Open IPC pipe to parent process

994

with contextlib.nested(os.fdopen(self.server.child_pipe[1],

995

u"w", 1),

996

os.fdopen(self.server.parent_pipe[0],

997

u"r", 0)) as (ipc,

998

ipc_return):

1171

with contextlib.closing(self.server.child_pipe) as child_pipe:

1172

logger.info(u"TCP connection from: %s",

1173

unicode(self.client_address))

1174

logger.debug(u"Pipe FD: %d",

1175

self.server.child_pipe.fileno())

1176

999

1177

session = (gnutls.connection

1000

1178

.ClientSession(self.request,

1001

1179

gnutls.connection

1002

1180

.X509Credentials()))

1003

1004

line = self.request.makefile().readline()

1005

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

1006

try:

1007

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

1008

raise RuntimeError

1009

except (ValueError, IndexError, RuntimeError), error:

1010

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

1011

return

1012

1181

1013

1182

# Note: gnutls.connection.X509Credentials is really a

1014

1183

# generic GnuTLS certificate credentials object so long as

1015

1184

# no X.509 keys are added to it. Therefore, we can use it

1016

1185

# here despite using OpenPGP certificates.

1017

1186

1018

1187

#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",

1019

1188

# u"+AES-256-CBC", u"+SHA1",

1020

1189

# u"+COMP-NULL", u"+CTYPE-OPENPGP",

1026

1195

(gnutls.library.functions

1027

1196

.gnutls_priority_set_direct(session._c_object,

1028

1197

priority, None))

1029

1198

1199

# Start communication using the Mandos protocol

1200

# Get protocol number

1201

line = self.request.makefile().readline()

1202

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

1203

try:

1204

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

1205

raise RuntimeError

1206

except (ValueError, IndexError, RuntimeError), error:

1207

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

1208

return

1209

1210

# Start GnuTLS connection

1030

1211

try:

1031

1212

session.handshake()

1032

1213

except gnutls.errors.GNUTLSError, error:

1035

1216

# established. Just abandon the request.

1036

1217

return

1037

1218

logger.debug(u"Handshake succeeded")

1219

1220

approval_required = False

1038

1221

try:

1039

1222

try:

1040

1223

fpr = self.fingerprint(self.peer_certificate

1044

1227

return

1045

1228

logger.debug(u"Fingerprint: %s", fpr)

1046

1229

1047

for c in self.server.clients:

1048

if c.fingerprint == fpr:

1049

client = c

1230

try:

1231

client = ProxyClient(child_pipe, fpr,

1232

self.client_address)

1233

except KeyError:

1234

return

1235

1236

if client.approval_delay:

1237

delay = client.approval_delay

1238

client.approvals_pending += 1

1239

approval_required = True

1240

1241

while True:

1242

if not client.enabled:

1243

logger.warning(u"Client %s is disabled",

1244

client.name)

1245

if self.server.use_dbus:

1246

# Emit D-Bus signal

1247

client.Rejected("Disabled")

1248

return

1249

1250

if client._approved or not client.approval_delay:

1251

#We are approved or approval is disabled

1050

1252

break

1051

else:

1052

ipc.write(u"NOTFOUND %s %s\n"

1053

% (fpr, unicode(self.client_address)))

1054

return

1055

# Have to check if client.enabled, since it is

1056

# possible that the client was disabled since the

1057

# GnuTLS session was established.

1058

ipc.write(u"GETATTR enabled %s\n" % fpr)

1059

enabled = pickle.load(ipc_return)

1060

if not enabled:

1061

ipc.write(u"DISABLED %s\n" % client.name)

1062

return

1063

ipc.write(u"SENDING %s\n" % client.name)

1253

elif client._approved is None:

1254

logger.info(u"Client %s needs approval",

1255

client.name)

1256

if self.server.use_dbus:

1257

# Emit D-Bus signal

1258

client.NeedApproval(

1259

client.approval_delay_milliseconds(),

1260

client.approved_by_default)

1261

else:

1262

logger.warning(u"Client %s was not approved",

1263

client.name)

1264

if self.server.use_dbus:

1265

# Emit D-Bus signal

1266

client.Rejected("Denied")

1267

return

1268

1269

#wait until timeout or approved

1270

#x = float(client._timedelta_to_milliseconds(delay))

1271

time = datetime.datetime.now()

1272

client.changedstate.acquire()

1273

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1274

client.changedstate.release()

1275

time2 = datetime.datetime.now()

1276

if (time2 - time) >= delay:

1277

if not client.approved_by_default:

1278

logger.warning("Client %s timed out while"

1279

" waiting for approval",

1280

client.name)

1281

if self.server.use_dbus:

1282

# Emit D-Bus signal

1283

client.Rejected("Approval timed out")

1284

return

1285

else:

1286

break

1287

else:

1288

delay -= time2 - time

1289

1064

1290

sent_size = 0

1065

1291

while sent_size < len(client.secret):

1066

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

1292

try:

1293

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

1294

except (gnutls.errors.GNUTLSError), error:

1295

logger.warning("gnutls send failed")

1296

return

1067

1297

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

1068

1298

sent, len(client.secret)

1069

1299

- (sent_size + sent))

1070

1300

sent_size += sent

1301

1302

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

1303

# bump the timeout as if seen

1304

client.checked_ok()

1305

if self.server.use_dbus:

1306

# Emit D-Bus signal

1307

client.GotSecret()

1308

1071

1309

finally:

1072

session.bye()

1310

if approval_required:

1311

client.approvals_pending -= 1

1312

try:

1313

session.bye()

1314

except (gnutls.errors.GNUTLSError), error:

1315

logger.warning("GnuTLS bye failed")

1073

1316

1074

1317

@staticmethod

1075

1318

def peer_certificate(session):

1135

1378

return hex_fpr

1136

1379

1137

1380

1138

class ForkingMixInWithPipes(socketserver.ForkingMixIn, object):

1139

"""Like socketserver.ForkingMixIn, but also pass a pipe pair."""

1381

class MultiprocessingMixIn(object):

1382

"""Like socketserver.ThreadingMixIn, but with multiprocessing"""

1383

def sub_process_main(self, request, address):

1384

try:

1385

self.finish_request(request, address)

1386

except:

1387

self.handle_error(request, address)

1388

self.close_request(request)

1389

1390

def process_request(self, request, address):

1391

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

1392

multiprocessing.Process(target = self.sub_process_main,

1393

args = (request, address)).start()

1394

1395

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1396

""" adds a pipe to the MixIn """

1140

1397

def process_request(self, request, client_address):

1141

1398

"""Overrides and wraps the original process_request().

1142

1399

1143

1400

This function creates a new pipe in self.pipe

1144

1401

"""

1145

self.child_pipe = os.pipe() # Child writes here

1146

self.parent_pipe = os.pipe() # Parent writes here

1147

super(ForkingMixInWithPipes,

1402

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1403

1404

super(MultiprocessingMixInWithPipe,

1148

1405

self).process_request(request, client_address)

1149

# Close unused ends for parent

1150

os.close(self.parent_pipe[0]) # close read end

1151

os.close(self.child_pipe[1]) # close write end

1152

self.add_pipe_fds(self.child_pipe[0], self.parent_pipe[1])

1153

def add_pipe_fds(self, child_pipe_fd, parent_pipe_fd):

1406

self.child_pipe.close()

1407

self.add_pipe(parent_pipe)

1408

1409

def add_pipe(self, parent_pipe):

1154

1410

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

1155

os.close(child_pipe_fd)

1156

os.close(parent_pipe_fd)

1157

1158

1159

class IPv6_TCPServer(ForkingMixInWithPipes,

1411

pass

1412

1413

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1160

1414

socketserver.TCPServer, object):

1161

1415

"""IPv6-capable TCP server. Accepts 'None' as address and/or port

1162

1416

1247

1501

return socketserver.TCPServer.server_activate(self)

1248

1502

def enable(self):

1249

1503

self.enabled = True

1250

def add_pipe_fds(self, child_pipe_fd, parent_pipe_fd):

1504

def add_pipe(self, parent_pipe):

1251

1505

# Call "handle_ipc" for both data and EOF events

1252

gobject.io_add_watch(child_pipe_fd,

1506

gobject.io_add_watch(parent_pipe.fileno(),

1253

1507

gobject.IO_IN | gobject.IO_HUP,

1254

1508

functools.partial(self.handle_ipc,

1255

reply_fd

1256

=parent_pipe_fd))

1257

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

1258

file_objects={}):

1509

parent_pipe = parent_pipe))

1510

1511

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

1512

client_object=None):

1259

1513

condition_names = {

1260

1514

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

1261

1515

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

1270

1524

for cond, name in

1271

1525

condition_names.iteritems()

1272

1526

if cond & condition)

1273

logger.debug(u"Handling IPC: FD = %d, condition = %s", source,

1274

conditions_string)

1275

1276

# Turn the pipe file descriptors into Python file objects

1277

if source not in file_objects:

1278

file_objects[source] = os.fdopen(source, u"r", 1)

1279

if reply_fd not in file_objects:

1280

file_objects[reply_fd] = os.fdopen(reply_fd, u"w", 0)

1281

1282

# Read a line from the file object

1283

cmdline = file_objects[source].readline()

1284

if not cmdline: # Empty line means end of file

1285

# close the IPC pipes

1286

file_objects[source].close()

1287

del file_objects[source]

1288

file_objects[reply_fd].close()

1289

del file_objects[reply_fd]

1290

1291

# Stop calling this function

1292

return False

1293

1294

logger.debug(u"IPC command: %r", cmdline)

1295

1296

# Parse and act on command

1297

cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)

1298

1299

if cmd == u"NOTFOUND":

1300

fpr, address = args.split(None, 1)

1301

logger.warning(u"Client not found for fingerprint: %s, ad"

1302

u"dress: %s", fpr, address)

1303

if self.use_dbus:

1304

# Emit D-Bus signal

1305

mandos_dbus_service.ClientNotFound(fpr, address)

1306

elif cmd == u"DISABLED":

1307

for client in self.clients:

1308

if client.name == args:

1309

logger.warning(u"Client %s is disabled", args)

1310

if self.use_dbus:

1311

# Emit D-Bus signal

1312

client.Rejected()

1313

break

1314

else:

1315

logger.error(u"Unknown client %s is disabled", args)

1316

elif cmd == u"SENDING":

1317

for client in self.clients:

1318

if client.name == args:

1319

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

1320

client.checked_ok()

1321

if self.use_dbus:

1322

# Emit D-Bus signal

1323

client.GotSecret()

1324

break

1325

else:

1326

logger.error(u"Sending secret to unknown client %s",

1327

args)

1328

elif cmd == u"GETATTR":

1329

attr_name, fpr = args.split(None, 1)

1330

for client in self.clients:

1331

if client.fingerprint == fpr:

1332

attr_value = getattr(client, attr_name, None)

1333

logger.debug("IPC reply: %r", attr_value)

1334

pickle.dump(attr_value, file_objects[reply_fd])

1335

break

1336

else:

1337

logger.error(u"Client %s on address %s requesting "

1338

u"attribute %s not found", fpr, address,

1339

attr_name)

1340

pickle.dump(None, file_objects[reply_fd])

1341

else:

1342

logger.error(u"Unknown IPC command: %r", cmdline)

1343

1344

# Keep calling this function

1527

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

1528

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

1529

return False

1530

1531

# Read a request from the child

1532

request = parent_pipe.recv()

1533

command = request[0]

1534

1535

if command == 'init':

1536

fpr = request[1]

1537

address = request[2]

1538

1539

for c in self.clients:

1540

if c.fingerprint == fpr:

1541

client = c

1542

break

1543

else:

1544

logger.warning(u"Client not found for fingerprint: %s, ad"

1545

u"dress: %s", fpr, address)

1546

if self.use_dbus:

1547

# Emit D-Bus signal

1548

mandos_dbus_service.ClientNotFound(fpr, address[0])

1549

parent_pipe.send(False)

1550

return False

1551

1552

gobject.io_add_watch(parent_pipe.fileno(),

1553

gobject.IO_IN | gobject.IO_HUP,

1554

functools.partial(self.handle_ipc,

1555

parent_pipe = parent_pipe,

1556

client_object = client))

1557

parent_pipe.send(True)

1558

# remove the old hook in favor of the new above hook on same fileno

1559

return False

1560

if command == 'funcall':

1561

funcname = request[1]

1562

args = request[2]

1563

kwargs = request[3]

1564

1565

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

1566

1567

if command == 'getattr':

1568

attrname = request[1]

1569

if callable(client_object.__getattribute__(attrname)):

1570

parent_pipe.send(('function',))

1571

else:

1572

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

1573

1574

if command == 'setattr':

1575

attrname = request[1]

1576

value = request[2]

1577

setattr(client_object, attrname, value)

1578

1345

1579

return True

1346

1580

1347

1581

1450

1684

parser.add_option("--debug", action=u"store_true",

1451

1685

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

1452

1686

u" terminal")

1687

parser.add_option("--debuglevel", type=u"string", metavar="LEVEL",

1688

help=u"Debug level for stdout output")

1453

1689

parser.add_option("--priority", type=u"string", help=u"GnuTLS"

1454

1690

u" priority string (see GnuTLS documentation)")

1455

1691

parser.add_option("--servicename", type=u"string",

1480

1716

u"servicename": u"Mandos",

1481

1717

u"use_dbus": u"True",

1482

1718

u"use_ipv6": u"True",

1719

u"debuglevel": u"",

1483

1720

}

1484

1721

1485

1722

# Parse config file for server-global settings

1502

1739

# options, if set.

1503

1740

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

1504

1741

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

1505

u"use_dbus", u"use_ipv6"):

1742

u"use_dbus", u"use_ipv6", u"debuglevel"):

1506

1743

value = getattr(options, option)

1507

1744

if value is not None:

1508

1745

server_settings[option] = value

1517

1754

1518

1755

# For convenience

1519

1756

debug = server_settings[u"debug"]

1757

debuglevel = server_settings[u"debuglevel"]

1520

1758

use_dbus = server_settings[u"use_dbus"]

1521

1759

use_ipv6 = server_settings[u"use_ipv6"]

1522

1523

if not debug:

1524

syslogger.setLevel(logging.WARNING)

1525

console.setLevel(logging.WARNING)

1526

1760

1527

1761

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

1528

1762

syslogger.setFormatter(logging.Formatter

1529

1763

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

1535

1769

u"interval": u"5m",

1536

1770

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

1537

1771

u"host": u"",

1772

u"approval_delay": u"0s",

1773

u"approval_duration": u"1s",

1538

1774

}

1539

1775

client_config = configparser.SafeConfigParser(client_defaults)

1540

1776

client_config.read(os.path.join(server_settings[u"configdir"],

1546

1782

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

1547

1783

server_settings[u"port"]),

1548

1784

ClientHandler,

1549

interface=server_settings[u"interface"],

1785

interface=(server_settings[u"interface"]

1786

or None),

1550

1787

use_ipv6=use_ipv6,

1551

1788

gnutls_priority=

1552

1789

server_settings[u"priority"],

1553

1790

use_dbus=use_dbus)

1554

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

1555

try:

1556

pidfile = open(pidfilename, u"w")

1557

except IOError:

1558

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

1791

if not debug:

1792

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

1793

try:

1794

pidfile = open(pidfilename, u"w")

1795

except IOError:

1796

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

1559

1797

1560

1798

try:

1561

1799

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

1578

1816

if error[0] != errno.EPERM:

1579

1817

raise error

1580

1818

1581

# Enable all possible GnuTLS debugging

1819

if not debug and not debuglevel:

1820

syslogger.setLevel(logging.WARNING)

1821

console.setLevel(logging.WARNING)

1822

if debuglevel:

1823

level = getattr(logging, debuglevel.upper())

1824

syslogger.setLevel(level)

1825

console.setLevel(level)

1826

1582

1827

if debug:

1828

# Enable all possible GnuTLS debugging

1829

1583

1830

# "Use a log level over 10 to enable all debugging options."

1584

1831

# - GnuTLS manual

1585

1832

gnutls.library.functions.gnutls_global_set_log_level(11)

1590

1837

1591

1838

(gnutls.library.functions

1592

1839

.gnutls_global_set_log_function(debug_gnutls))

1840

1841

# Redirect stdin so all checkers get /dev/null

1842

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

1843

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

1844

if null > 2:

1845

os.close(null)

1846

else:

1847

# No console logging

1848

logger.removeHandler(console)

1849

1593

1850

1594

1851

global main_loop

1595

1852

# From the Avahi example code

1613

1870

if server_settings["interface"]:

1614

1871

service.interface = (if_nametoindex

1615

1872

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

1873

1874

if not debug:

1875

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

1876

daemon()

1877

1878

global multiprocessing_manager

1879

multiprocessing_manager = multiprocessing.Manager()

1616

1880

1617

1881

client_class = Client

1618

1882

if use_dbus:

1619

1883

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

1884

def client_config_items(config, section):

1885

special_settings = {

1886

"approved_by_default":

1887

lambda: config.getboolean(section,

1888

"approved_by_default"),

1889

}

1890

for name, value in config.items(section):

1891

try:

1892

yield (name, special_settings[name]())

1893

except KeyError:

1894

yield (name, value)

1895

1620

1896

tcp_server.clients.update(set(

1621

1897

client_class(name = section,

1622

config= dict(client_config.items(section)))

1898

config= dict(client_config_items(

1899

client_config, section)))

1623

1900

for section in client_config.sections()))

1624

1901

if not tcp_server.clients:

1625

1902

logger.warning(u"No clients defined")

1626

1627

if debug:

1628

# Redirect stdin so all checkers get /dev/null

1629

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

1630

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

1631

if null > 2:

1632

os.close(null)

1633

else:

1634

# No console logging

1635

logger.removeHandler(console)

1636

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

1637

daemon()

1638

1639

try:

1640

with pidfile:

1641

pid = os.getpid()

1642

pidfile.write(str(pid) + "\n")

1643

del pidfile

1644

except IOError:

1645

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

1646

pidfilename, pid)

1647

except NameError:

1648

# "pidfile" was never created

1649

pass

1650

del pidfilename

1651

1903

1652

1904

if not debug:

1905

try:

1906

with pidfile:

1907

pid = os.getpid()

1908

pidfile.write(str(pid) + "\n")

1909

del pidfile

1910

except IOError:

1911

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

1912

pidfilename, pid)

1913

except NameError:

1914

# "pidfile" was never created

1915

pass

1916

del pidfilename

1917

1653

1918

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

1919

1654

1920

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

1655

1921

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

1656

1922