/mandos/trunk : revision 403

55

import logging

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import logging.handlers

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import pwd

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import contextlib

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from contextlib import closing

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import struct

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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 select

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import dbus

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import dbus.service

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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 entry group state change: %i", state)

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logger.debug(u"Avahi 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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enabled: bool()

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

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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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until this client is invalid

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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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if u"secret" in config:

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self.secret = config[u"secret"].decode(u"base64")

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elif u"secfile" in config:

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with open(os.path.expanduser(os.path.expandvars

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(config[u"secfile"])),

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"rb") as secfile:

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with closing(open(os.path.expanduser

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(os.path.expandvars

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(config[u"secfile"])),

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"rb")) as secfile:

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self.secret = secfile.read()

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else:

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raise TypeError(u"No secret or secfile for client %s"

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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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# than 'timeout' for the client to be declared invalid, which

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# is as it should be.

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

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try:

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

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raise

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self.checker = None

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def still_valid(self):

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"""Has the timeout not yet passed for this client?"""

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

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return False

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now = datetime.datetime.utcnow()

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if self.last_checked_ok is None:

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return now < (self.created + self.timeout)

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else:

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return now < (self.last_checked_ok + self.timeout)

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

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dbus.service.method, except there is only "signature", since the

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type from Get() and the type sent to Set() is the same.

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"""

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# Encoding deeply encoded byte arrays is not supported yet by the

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

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if byte_arrays and signature != u"ay":

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

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u" signature %r" % signature)

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def decorator(func):

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func._dbus_is_property = True

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func._dbus_interface = dbus_interface

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if prop._dbus_access == u"read":

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raise DBusPropertyAccessException(property_name)

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if prop._dbus_get_args_options[u"byte_arrays"]:

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# The byte_arrays option is not supported yet on

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# signatures other than "ay".

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if prop._dbus_signature != u"ay":

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raise ValueError

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value = dbus.ByteArray(''.join(unichr(byte)

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for byte in value))

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prop(value)

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dbus.Boolean(False, variant_level=1))

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return r

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## D-Bus methods, signals & properties

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## D-Bus methods & signals

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

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## Signals

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# CheckedOK - method

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@dbus.service.method(_interface)

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def CheckedOK(self):

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return self.checked_ok()

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# CheckerCompleted - signal

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

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"D-Bus signal"

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pass

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## Methods

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# CheckedOK - method

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@dbus.service.method(_interface)

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def CheckedOK(self):

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return self.checked_ok()

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# Enable - method

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@dbus.service.method(_interface)

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def Enable(self):

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def StopChecker(self):

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self.stop_checker()

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## Properties

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# name - property

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

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def name_dbus_property(self):

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def handle(self):

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

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unicode(self.client_address))

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

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self.server.child_pipe[1].fileno())

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

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# Open IPC pipe to parent process

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

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self.server.parent_pipe[0]

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) as (ipc, ipc_return):

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with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:

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session = (gnutls.connection

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.ClientSession(self.request,

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gnutls.connection

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.X509Credentials()))

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

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

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try:

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

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raise RuntimeError

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except (ValueError, IndexError, RuntimeError), error:

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

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return

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# Note: gnutls.connection.X509Credentials is really a

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# generic GnuTLS certificate credentials object so long as

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

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.gnutls_priority_set_direct(session._c_object,

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priority, None))

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# Start communication using the Mandos protocol

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# Get protocol number

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

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

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try:

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

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raise RuntimeError

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except (ValueError, IndexError, RuntimeError), error:

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

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return

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# Start GnuTLS connection

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try:

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session.handshake()

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except gnutls.errors.GNUTLSError, error:

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return

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logger.debug(u"Handshake succeeded")

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try:

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try:

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fpr = self.fingerprint(self.peer_certificate

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(session))

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except (TypeError, gnutls.errors.GNUTLSError), error:

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logger.warning(u"Bad certificate: %s", error)

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return

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

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for c in self.server.clients:

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if c.fingerprint == fpr:

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client = c

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break

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else:

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

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

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return

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class ClientProxy(object):

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"""Client proxy object. Not for calling methods."""

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def __init__(self, client):

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self.client = client

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def __getattr__(self, name):

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if name.startswith("ipc_"):

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def tempfunc():

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ipc.write("%s %s\n" % (name[4:].upper(),

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self.client.name))

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return tempfunc

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if not hasattr(self.client, name):

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raise AttributeError

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

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% (name, self.client.fingerprint))

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return pickle.load(ipc_return)

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clientproxy = ClientProxy(client)

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

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# possible that the client was disabled since the

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# GnuTLS session was established.

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if not clientproxy.enabled:

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clientproxy.ipc_disabled()

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return

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clientproxy.ipc_sending()

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sent_size = 0

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while sent_size < len(client.secret):

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

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

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sent, len(client.secret)

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- (sent_size + sent))

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sent_size += sent

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finally:

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session.bye()

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fpr = self.fingerprint(self.peer_certificate(session))

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except (TypeError, gnutls.errors.GNUTLSError), error:

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logger.warning(u"Bad certificate: %s", error)

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session.bye()

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return

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

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for c in self.server.clients:

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if c.fingerprint == fpr:

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client = c

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break

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else:

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

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

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session.bye()

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return

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# Have to check if client.still_valid(), since it is

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# possible that the client timed out while establishing

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# the GnuTLS session.

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if not client.still_valid():

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

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session.bye()

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return

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

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sent_size = 0

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while sent_size < len(client.secret):

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

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

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sent, len(client.secret)

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- (sent_size + sent))

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sent_size += sent

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session.bye()

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@staticmethod

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def peer_certificate(session):

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return hex_fpr

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class ForkingMixInWithPipes(socketserver.ForkingMixIn, object):

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

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class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):

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

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def process_request(self, request, client_address):

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

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This function creates a new pipe in self.pipe

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"""

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# Child writes to child_pipe

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self.child_pipe = map(os.fdopen, os.pipe(), u"rw", (1, 0))

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# Parent writes to parent_pipe

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self.parent_pipe = map(os.fdopen, os.pipe(), u"rw", (1, 0))

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super(ForkingMixInWithPipes,

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self.pipe = os.pipe()

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super(ForkingMixInWithPipe,

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self).process_request(request, client_address)

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# Close unused ends for parent

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

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

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

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def add_pipe_fds(self, child_pipe_fd, parent_pipe_fd):

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

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self.add_pipe(self.pipe[0])

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def add_pipe(self, pipe):

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

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child_pipe_fd.close()

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parent_pipe_fd.close()

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class IPv6_TCPServer(ForkingMixInWithPipes,

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os.close(pipe)

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class IPv6_TCPServer(ForkingMixInWithPipe,

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socketserver.TCPServer, object):

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

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return socketserver.TCPServer.server_activate(self)

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def enable(self):

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self.enabled = True

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def add_pipe_fds(self, child_pipe_fd, parent_pipe_fd):

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def add_pipe(self, pipe):

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# Call "handle_ipc" for both data and EOF events

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gobject.io_add_watch(child_pipe_fd.fileno(),

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gobject.IO_IN | gobject.IO_HUP,

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functools.partial(self.handle_ipc,

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reply = parent_pipe_fd,

1284

sender= child_pipe_fd))

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def handle_ipc(self, source, condition, reply=None, sender=None):

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gobject.io_add_watch(pipe, gobject.IO_IN | gobject.IO_HUP,

1244

self.handle_ipc)

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def handle_ipc(self, source, condition, file_objects={}):

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condition_names = {

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

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

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

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conditions_string)

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# Turn the pipe file descriptor into a Python file object

1264

if source not in file_objects:

1265

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

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# Read a line from the file object

1304

cmdline = sender.readline()

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cmdline = file_objects[source].readline()

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if not cmdline: # Empty line means end of file

1306

# close the IPC pipes

1307

sender.close()

1308

reply.close()

1270

# close the IPC pipe

1271

file_objects[source].close()

1272

del file_objects[source]

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# Stop calling this function

1311

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return False

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

1317

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1318

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if cmd == u"NOTFOUND":

1319

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

1320

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

1321

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

1283

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

1284

args)

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1285

if self.use_dbus:

1323

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# Emit D-Bus signal

1324

mandos_dbus_service.ClientNotFound(fpr, address)

1325

elif cmd == u"DISABLED":

1287

mandos_dbus_service.ClientNotFound(args)

1288

elif cmd == u"INVALID":

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for client in self.clients:

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1290

if client.name == args:

1328

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

1291

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

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if self.use_dbus:

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1293

# Emit D-Bus signal

1331

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client.Rejected()

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break

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else:

1334

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

1297

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

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1298

elif cmd == u"SENDING":

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1299

for client in self.clients:

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1300

if client.name == args:

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1307

else:

1345

1308

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

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args)

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elif cmd == u"GETATTR":

1348

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

1349

for client in self.clients:

1350

if client.fingerprint == fpr:

1351

attr_value = getattr(client, attr_name, None)

1352

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

1353

pickle.dump(attr_value, reply)

1354

break

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else:

1356

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

1357

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

1358

attr_name)

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pickle.dump(None, reply)

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else:

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

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def if_nametoindex(interface):

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"Get an interface index the hard way, i.e. using fcntl()"

1419

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

1420

with contextlib.closing(socket.socket()) as s:

1370

with closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(str(u"16s16x"),

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interface))

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

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server_settings[u"port"]),

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ClientHandler,

1568

interface=(server_settings[u"interface"]

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or None),

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interface=server_settings[u"interface"],

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use_ipv6=use_ipv6,

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gnutls_priority=

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server_settings[u"priority"],

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daemon()

1658

1607

1659

1608

try:

1660

with pidfile:

1609

with closing(pidfile):

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pid = os.getpid()

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

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1612

del pidfile

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

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1631

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

1683

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

1685

def ClientAdded(self, objpath):

1633

@dbus.service.signal(_interface, signature=u"oa{sv}")

1634

def ClientAdded(self, objpath, properties):

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1635

"D-Bus signal"

1687

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pass

1688

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

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def ClientNotFound(self, fingerprint, address):

1638

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

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def ClientNotFound(self, fingerprint):

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1640

"D-Bus signal"

1692

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pass

1693

1642

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for client in tcp_server.clients:

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1700

if use_dbus:

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# Emit D-Bus signal

1753

mandos_dbus_service.ClientAdded(client.dbus_object_path)

1702

mandos_dbus_service.ClientAdded(client.dbus_object_path,

1703

client.GetAll(u""))

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client.enable()

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1705

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1706

tcp_server.enable()