/mandos/trunk : revision 573

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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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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.5.4"

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version = "1.5.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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self.server_state_changed)

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

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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"created", "enabled", "expires",

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

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"last_approval_request", "last_checked_ok",

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

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

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

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

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"extended_timeout": "15m",

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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

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return False

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if not quiet:

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self.send_changedstate()

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if not quiet:

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

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

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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if not quiet:

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self.send_changedstate()

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

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return False

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def init_checker(self):

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

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# and every interval from then on.

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if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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self.start_checker))

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

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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timeout = self.timeout

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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

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self.disable_initiator_tag = (gobject.timeout_add

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(timedelta_to_milliseconds

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If a checker already exists, leave it running and do

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nothing."""

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

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

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

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# would inevitably timeout, since no checker would get a

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

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

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

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# client would inevitably timeout, since no checker would get

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

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

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

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# should be.

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self.current_checker_command)

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# Start a new checker if needed

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if self.checker is None:

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# Escape attributes for the shell

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escaped_attrs = dict(

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

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for attr in

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self.runtime_expansions)

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try:

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command = self.checker_command % escaped_attrs

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except TypeError as error:

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

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self.checker_command, exc_info=error)

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return True # Try again later

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# In case checker_command has exactly one % operator

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command = self.checker_command % self.host

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except TypeError:

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# Escape attributes for the shell

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escaped_attrs = dict(

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(attr,

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

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errors=

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'replace')))

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for attr in

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self.runtime_expansions)

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try:

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command = self.checker_command % escaped_attrs

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except TypeError as error:

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

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self.checker_command, exc_info=error)

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return True # Try again later

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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="/")

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self.checker_callback_tag = (gobject.child_watch_add

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(self.checker.pid,

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self.checker_callback,

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data=command))

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# The checker may have completed before the gobject

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# watch was added. Check for this.

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

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if pid:

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gobject.source_remove(self.checker_callback_tag)

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self.checker_callback(pid, status, command)

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except OSError as error:

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logger.error("Failed to start subprocess",

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exc_info=error)

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self.checker_callback_tag = (gobject.child_watch_add

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(self.checker.pid,

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self.checker_callback,

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data=command))

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# The checker may have completed before the gobject

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# watch was added. Check for this.

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

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if pid:

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gobject.source_remove(self.checker_callback_tag)

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self.checker_callback(pid, status, command)

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

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return True

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tag.appendChild(ann_tag)

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# Add interface annotation tags

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for annotation, value in dict(

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itertools.chain.from_iterable(

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annotations().iteritems()

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for name, annotations in

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self._get_all_dbus_things("interface")

989

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

990

)).iteritems():

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itertools.chain(

983

*(annotations().iteritems()

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for name, annotations in

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self._get_all_dbus_things("interface")

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

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))).iteritems():

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ann_tag = document.createElement("annotation")

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ann_tag.setAttribute("name", annotation)

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ann_tag.setAttribute("value", value)

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variant_level=variant_level)

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def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

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

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

1030

interface names according to the "alt_interface_names" mapping.

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Usage:

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

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"net.example.AlternateInterface"})

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class SampleDBusObject(dbus.service.Object):

1036

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

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def SampleDBusMethod():

1038

pass

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The above "SampleDBusMethod" on "SampleDBusObject" will be

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

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

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

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

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

1047

(from DBusObjectWithProperties) and interfaces (from the

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dbus_interface_annotations decorator).

1024

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

1025

.__metaclass__):

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

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

1049

1028

"""

1050

def wrapper(cls):

1051

for orig_interface_name, alt_interface_name in (

1052

alt_interface_names.iteritems()):

1053

attr = {}

1054

interface_names = set()

1055

# Go though all attributes of the class

1056

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

1029

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

1030

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

1031

# methods, signals, or properties in them

1032

old_interface_names = []

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for base in (b for b in bases

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

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# Go though all attributes of the base class

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

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

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1038

# with the wrong interface name

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if (not hasattr(attribute, "_dbus_interface")

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or not attribute._dbus_interface

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.startswith(orig_interface_name)):

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

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1042

continue

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1043

# Create an alternate D-Bus interface name based on

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1044

# the current name

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alt_interface = (attribute._dbus_interface

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.replace(orig_interface_name,

1067

alt_interface_name))

1068

interface_names.add(alt_interface)

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.replace("se.recompile.Mandos",

1047

"se.bsnet.fukt.Mandos"))

1048

if alt_interface != attribute._dbus_interface:

1049

old_interface_names.append(alt_interface)

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# Is this a D-Bus signal?

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

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# Extract the original non-method function by

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1074

except AttributeError:

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1075

pass

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# Define a creator of a function to call both the

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# original and alternate functions, so both the

1097

# original and alternate signals gets sent when

1098

# the function is called

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

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# signals gets sent when the function is called

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def fixscope(func1, func2):

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"""This function is a scope container to pass

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func1 and func2 to the "call_both" function

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1088

return call_both

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1089

# Create the "call_both" function and add it to

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# the class

1111

attr[attrname] = fixscope(attribute, new_function)

1091

attr[attrname] = fixscope(attribute,

1092

new_function)

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1093

# Is this a D-Bus method?

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1094

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

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1095

# Create a new, but exactly alike, function

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1151

attribute.func_name,

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1152

attribute.func_defaults,

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1153

attribute.func_closure)))

1173

if deprecate:

1174

# Deprecate all alternate interfaces

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1176

for interface_name in interface_names:

1177

@dbus_interface_annotations(interface_name)

1178

def func(self):

1179

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

1180

"true" }

1181

# Find an unused name

1182

for aname in (iname.format(i)

1183

for i in itertools.count()):

1184

if aname not in attr:

1185

attr[aname] = func

1186

break

1187

if interface_names:

1188

# Replace the class with a new subclass of it with

1189

# methods, signals, etc. as created above.

1190

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

1191

(cls,), attr)

1192

return cls

1193

return wrapper

1194

1195

1196

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

1197

"se.bsnet.fukt.Mandos"})

1154

# Deprecate all old interfaces

1155

iname="_AlternateDBusNamesMetaclass_interface_annotation{0}"

1156

for old_interface_name in old_interface_names:

1157

@dbus_interface_annotations(old_interface_name)

1158

def func(self):

1159

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

1160

# Find an unused name

1161

for aname in (iname.format(i) for i in itertools.count()):

1162

if aname not in attr:

1163

attr[aname] = func

1164

break

1165

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

1166

1167

1198

1168

class ClientDBus(Client, DBusObjectWithProperties):

1199

1169

"""A Client class using D-Bus

1200

1170

1336

1306

return False

1337

1307

1338

1308

def approve(self, value=True):

1309

self.send_changedstate()

1339

1310

self.approved = value

1340

1311

gobject.timeout_add(timedelta_to_milliseconds

1341

1312

(self.approval_duration),

1342

1313

self._reset_approved)

1343

self.send_changedstate()

1344

1314

1345

1315

## D-Bus methods, signals & properties

1346

1316

_interface = "se.recompile.Mandos.Client"

1530

1500

def Timeout_dbus_property(self, value=None):

1531

1501

if value is None: # get

1532

1502

return dbus.UInt64(self.timeout_milliseconds())

1533

old_timeout = self.timeout

1534

1503

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

1535

# Reschedule disabling

1504

# Reschedule timeout

1536

1505

if self.enabled:

1537

1506

now = datetime.datetime.utcnow()

1538

self.expires += self.timeout - old_timeout

1539

if self.expires <= now:

1507

time_to_die = timedelta_to_milliseconds(

1508

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

1509

if time_to_die <= 0:

1540

1510

# The timeout has passed

1541

1511

self.disable()

1542

1512

else:

1513

self.expires = (now +

1514

datetime.timedelta(milliseconds =

1515

time_to_die))

1543

1516

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

1544

1517

is None):

1545

1518

return

1546

1519

gobject.source_remove(self.disable_initiator_tag)

1547

self.disable_initiator_tag = (

1548

gobject.timeout_add(

1549

timedelta_to_milliseconds(self.expires - now),

1550

self.disable))

1520

self.disable_initiator_tag = (gobject.timeout_add

1521

(time_to_die,

1522

self.disable))

1551

1523

1552

1524

# ExtendedTimeout - property

1553

1525

@dbus_service_property(_interface, signature="t",

1632

1604

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

1633

1605

1634

1606

1607

class ClientDBusTransitional(ClientDBus):

1608

__metaclass__ = AlternateDBusNamesMetaclass

1609

1610

1635

1611

class ClientHandler(socketserver.BaseRequestHandler, object):

1636

1612

"""A class to handle client connections.

1637

1613

1741

1717

#wait until timeout or approved

1742

1718

time = datetime.datetime.now()

1743

1719

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1720

(client.changedstate.wait

1721

(float(client.timedelta_to_milliseconds(delay)

1722

/ 1000)))

1747

1723

client.changedstate.release()

1748

1724

time2 = datetime.datetime.now()

1749

1725

if (time2 - time) >= delay:

1765

1741

try:

1766

1742

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

1767

1743

except gnutls.errors.GNUTLSError as error:

1768

logger.warning("gnutls send failed",

1769

exc_info=error)

1744

logger.warning("gnutls send failed")

1770

1745

return

1771

1746

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

1772

1747

sent, len(client.secret)

1786

1761

try:

1787

1762

session.bye()

1788

1763

except gnutls.errors.GNUTLSError as error:

1789

logger.warning("GnuTLS bye failed",

1790

exc_info=error)

1764

logger.warning("GnuTLS bye failed")

1791

1765

1792

1766

@staticmethod

1793

1767

def peer_certificate(session):

1865

1839

def process_request(self, request, address):

1866

1840

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

1867

1841

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

1868

args = (request, address))

1842

args = (request,

1843

address))

1869

1844

proc.start()

1870

1845

return proc

1871

1846

1921

1896

str(self.interface

1922

1897

+ '\0'))

1923

1898

except socket.error as error:

1924

if error.errno == errno.EPERM:

1899

if error[0] == errno.EPERM:

1925

1900

logger.error("No permission to"

1926

1901

" bind to interface %s",

1927

1902

self.interface)

1928

elif error.errno == errno.ENOPROTOOPT:

1903

elif error[0] == errno.ENOPROTOOPT:

1929

1904

logger.error("SO_BINDTODEVICE not available;"

1930

1905

" cannot bind to interface %s",

1931

1906

self.interface)

1932

elif error.errno == errno.ENODEV:

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1936

1907

else:

1937

1908

raise

1938

1909

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

1997

1968

1998

1969

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

1999

1970

proc = None, client_object=None):

1971

condition_names = {

1972

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

1973

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

1974

# blocking).

1975

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

1976

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

1977

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

1978

# broken, usually for pipes and

1979

# sockets).

1980

}

1981

conditions_string = ' | '.join(name

1982

for cond, name in

1983

condition_names.iteritems()

1984

if cond & condition)

2000

1985

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

2001

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

1986

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

2002

1987

# Wait for other process to exit

2003

1988

proc.join()

2004

1989

return False

2270

2255

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

2271

2256

try:

2272

2257

pidfile = open(pidfilename, "w")

2273

except IOError as e:

2274

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

2275

exc_info=e)

2258

except IOError:

2259

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

2276

2260

2277

2261

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

2278

2262

try:

2288

2272

os.setgid(gid)

2289

2273

os.setuid(uid)

2290

2274

except OSError as error:

2291

if error.errno != errno.EPERM:

2275

if error[0] != errno.EPERM:

2292

2276

raise error

2293

2277

2294

2278

if debug:

2332

2316

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

2333

2317

do_not_queue=True))

2334

2318

except dbus.exceptions.NameExistsException as e:

2335

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

2319

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

2336

2320

use_dbus = False

2337

2321

server_settings["use_dbus"] = False

2338

2322

tcp_server.use_dbus = False

2350

2334

2351

2335

client_class = Client

2352

2336

if use_dbus:

2353

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

2337

client_class = functools.partial(ClientDBusTransitional,

2338

bus = bus)

2354

2339

2355

2340

client_settings = Client.config_parser(client_config)

2356

2341

old_client_settings = {}

2364

2349

(stored_state))

2365

2350

os.remove(stored_state_path)

2366

2351

except IOError as e:

2367

if e.errno == errno.ENOENT:

2368

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

2369

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

2370

else:

2371

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

2372

exc_info=e)

2352

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

2353

.format(e))

2354

if e.errno != errno.ENOENT:

2373

2355

raise

2374

2356

except EOFError as e:

2375

2357

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

2376

"EOFError:", exc_info=e)

2358

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

2377

2359

2378

2360

with PGPEngine() as pgp:

2379

2361

for client_name, client in clients_data.iteritems():

2462

2444

# "pidfile" was never created

2463

2445

pass

2464

2446

del pidfilename

2447

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

2465

2448

2466

2449

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

2467

2450

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

2468

2451

2469

2452

if use_dbus:

2470

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

2471

"se.bsnet.fukt.Mandos"})

2472

2453

class MandosDBusService(DBusObjectWithProperties):

2473

2454

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

2474

2455

def __init__(self):

2528

2509

2529

2510

del _interface

2530

2511

2531

mandos_dbus_service = MandosDBusService()

2512

class MandosDBusServiceTransitional(MandosDBusService):

2513

__metaclass__ = AlternateDBusNamesMetaclass

2514

mandos_dbus_service = MandosDBusServiceTransitional()

2532

2515

2533

2516

def cleanup():

2534

2517

"Cleanup function; run on exit"

2567

2550

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

2568

2551

2569

2552

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:

2553

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

2554

prefix="clients-",

2555

dir=os.path.dirname

2556

(stored_state_path))

2557

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

2574

2558

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

2575

tempname=stored_state.name

2576

2559

os.rename(tempname, stored_state_path)

2577

2560

except (IOError, OSError) as e:

2561

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

2562

.format(e))

2578

2563

if not debug:

2579

2564

try:

2580

2565

os.remove(tempname)

2581

2566

except NameError:

2582

2567

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)

2568

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

2569

errno.EEXIST)):

2589

2570

raise e

2590

2571

2591

2572

# Delete all clients, and settings from config