/mandos/trunk : revision 427

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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from __future__ import division, absolute_import, with_statement

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import sys

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import os

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import signal

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import datetime

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import urwid.curses_display

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import urwid

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from dbus.mainloop.glib import DBusGMainLoop

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import gobject

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import dbus

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import UserList

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import locale

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locale.setlocale(locale.LC_ALL, u'')

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import logging

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logging.getLogger('dbus.proxies').setLevel(logging.CRITICAL)

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# Some useful constants

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domain = 'se.bsnet.fukt'

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server_interface = domain + '.Mandos'

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client_interface = domain + '.Mandos.Client'

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version = "1.0.15"

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# Always run in monochrome mode

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urwid.curses_display.curses.has_colors = lambda : False

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# Urwid doesn't support blinking, but we want it. Since we have no

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# use for underline on its own, we make underline also always blink.

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urwid.curses_display.curses.A_UNDERLINE |= (

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urwid.curses_display.curses.A_BLINK)

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def isoformat_to_datetime(iso):

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"Parse an ISO 8601 date string to a datetime.datetime()"

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if not iso:

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return None

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d, t = iso.split(u"T", 1)

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year, month, day = d.split(u"-", 2)

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hour, minute, second = t.split(u":", 2)

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second, fraction = divmod(float(second), 1)

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return datetime.datetime(int(year),

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int(month),

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int(day),

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int(hour),

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int(minute),

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int(second), # Whole seconds

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int(fraction*1000000)) # Microseconds

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class MandosClientPropertyCache(object):

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"""This wraps a Mandos Client D-Bus proxy object, caches the

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properties and calls a hook function when any of them are

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changed.

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"""

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

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self.proxy = proxy_object # Mandos Client proxy object

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self.properties = dict()

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self.proxy.connect_to_signal(u"PropertyChanged",

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self.property_changed,

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client_interface,

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byte_arrays=True)

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self.properties.update(

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self.proxy.GetAll(client_interface,

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dbus_interface = dbus.PROPERTIES_IFACE))

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#XXX This break good super behaviour!

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# super(MandosClientPropertyCache, self).__init__(

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# *args, **kwargs)

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def property_changed(self, property=None, value=None):

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"""This is called whenever we get a PropertyChanged signal

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It updates the changed property in the "properties" dict.

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"""

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# Update properties dict with new value

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self.properties[property] = value

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class MandosClientWidget(urwid.FlowWidget, MandosClientPropertyCache):

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"""A Mandos Client which is visible on the screen.

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"""

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def __init__(self, server_proxy_object=None, update_hook=None,

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delete_hook=None, logger=None, *args, **kwargs):

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# Called on update

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self.update_hook = update_hook

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# Called on delete

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self.delete_hook = delete_hook

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# Mandos Server proxy object

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self.server_proxy_object = server_proxy_object

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# Logger

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self.logger = logger

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self._update_timer_callback_tag = None

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self.last_checker_failed = False

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# The widget shown normally

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self._text_widget = urwid.Text(u"")

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# The widget shown when we have focus

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self._focus_text_widget = urwid.Text(u"")

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super(MandosClientWidget, self).__init__(

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update_hook=update_hook, delete_hook=delete_hook,

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*args, **kwargs)

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self.update()

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self.opened = False

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self.proxy.connect_to_signal(u"CheckerCompleted",

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self.checker_completed,

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client_interface,

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byte_arrays=True)

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self.proxy.connect_to_signal(u"CheckerStarted",

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self.checker_started,

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client_interface,

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byte_arrays=True)

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self.proxy.connect_to_signal(u"GotSecret",

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self.got_secret,

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client_interface,

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byte_arrays=True)

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self.proxy.connect_to_signal(u"NeedApproval",

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self.need_approval,

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client_interface,

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byte_arrays=True)

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self.proxy.connect_to_signal(u"Rejected",

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self.rejected,

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client_interface,

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byte_arrays=True)

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last_checked_ok = isoformat_to_datetime(self.properties

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[u"LastCheckedOK"])

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if last_checked_ok is None:

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self.last_checker_failed = True

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else:

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self.last_checker_failed = ((datetime.datetime.utcnow()

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- last_checked_ok)

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> datetime.timedelta

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(milliseconds=

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self.properties

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[u"Interval"]))

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if self.last_checker_failed:

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self._update_timer_callback_tag = (gobject.timeout_add

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(1000,

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self.update_timer))

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def checker_completed(self, exitstatus, condition, command):

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if exitstatus == 0:

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if self.last_checker_failed:

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self.last_checker_failed = False

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gobject.source_remove(self._update_timer_callback_tag)

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self._update_timer_callback_tag = None

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#self.logger(u'Checker for client %s (command "%s")'

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# u' was successful'

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# % (self.properties[u"Name"], command))

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self.update()

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return

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# Checker failed

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if not self.last_checker_failed:

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self.last_checker_failed = True

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self._update_timer_callback_tag = (gobject.timeout_add

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(1000,

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self.update_timer))

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if os.WIFEXITED(condition):

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self.logger(u'Checker for client %s (command "%s")'

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u' failed with exit code %s'

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% (self.properties[u"Name"], command,

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os.WEXITSTATUS(condition)))

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elif os.WIFSIGNALED(condition):

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self.logger(u'Checker for client %s (command "%s")'

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u' was killed by signal %s'

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% (self.properties[u"Name"], command,

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os.WTERMSIG(condition)))

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elif os.WCOREDUMP(condition):

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self.logger(u'Checker for client %s (command "%s")'

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u' dumped core'

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% (self.properties[u"Name"], command))

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else:

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self.logger(u'Checker for client %s completed'

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u' mysteriously')

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self.update()

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def checker_started(self, command):

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#self.logger(u'Client %s started checker "%s"'

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# % (self.properties[u"Name"], unicode(command)))

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pass

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def got_secret(self):

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self.last_checker_failed = False

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self.logger(u'Client %s received its secret'

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% self.properties[u"Name"])

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def need_approval(self, timeout, default):

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if not default:

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message = u'Client %s needs approval within %s seconds'

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else:

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message = u'Client %s will get its secret in %s seconds'

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self.logger(message

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% (self.properties[u"Name"], timeout/1000))

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def rejected(self, reason):

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self.logger(u'Client %s was rejected; reason: %s'

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% (self.properties[u"Name"], reason))

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def selectable(self):

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"""Make this a "selectable" widget.

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This overrides the method from urwid.FlowWidget."""

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return True

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def rows(self, (maxcol,), focus=False):

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"""How many rows this widget will occupy might depend on

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whether we have focus or not.

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This overrides the method from urwid.FlowWidget"""

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return self.current_widget(focus).rows((maxcol,), focus=focus)

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def current_widget(self, focus=False):

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if focus or self.opened:

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return self._focus_widget

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return self._widget

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def update(self):

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"Called when what is visible on the screen should be updated."

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# How to add standout mode to a style

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with_standout = { u"normal": u"standout",

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u"bold": u"bold-standout",

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u"underline-blink":

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u"underline-blink-standout",

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u"bold-underline-blink":

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u"bold-underline-blink-standout",

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}

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# Rebuild focus and non-focus widgets using current properties

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# Base part of a client. Name!

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base = (u'%(name)s: '

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% {u"name": self.properties[u"Name"]})

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if not self.properties[u"Enabled"]:

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message = u"DISABLED"

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elif self.properties[u"ApprovalPending"]:

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if self.properties[u"ApprovedByDefault"]:

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message = u"Connection established to client. (d)eny?"

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else:

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message = u"Seeks approval to send secret. (a)pprove?"

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elif self.last_checker_failed:

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timeout = datetime.timedelta(milliseconds

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= self.properties

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[u"Timeout"])

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last_ok = isoformat_to_datetime(

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max((self.properties[u"LastCheckedOK"]

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or self.properties[u"Created"]),

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self.properties[u"LastEnabled"]))

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timer = timeout - (datetime.datetime.utcnow() - last_ok)

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message = (u'A checker has failed! Time until client'

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u' gets diabled: %s'

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% unicode(timer).rsplit(".", 1)[0])

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else:

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message = u"enabled"

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self._text = "%s%s" % (base, message)

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if not urwid.supports_unicode():

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self._text = self._text.encode("ascii", "replace")

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textlist = [(u"normal", self._text)]

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self._text_widget.set_text(textlist)

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self._focus_text_widget.set_text([(with_standout[text[0]],

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text[1])

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if isinstance(text, tuple)

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else text

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for text in textlist])

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self._widget = self._text_widget

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self._focus_widget = urwid.AttrWrap(self._focus_text_widget,

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"standout")

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# Run update hook, if any

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if self.update_hook is not None:

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self.update_hook()

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def update_timer(self):

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"called by gobject"

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self.update()

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return True # Keep calling this

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def delete(self):

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if self._update_timer_callback_tag is not None:

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gobject.source_remove(self._update_timer_callback_tag)

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self._update_timer_callback_tag = None

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if self.delete_hook is not None:

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self.delete_hook(self)

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def render(self, (maxcol,), focus=False):

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"""Render differently if we have focus.

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This overrides the method from urwid.FlowWidget"""

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return self.current_widget(focus).render((maxcol,),

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focus=focus)

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def keypress(self, (maxcol,), key):

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"""Handle keys.

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This overrides the method from urwid.FlowWidget"""

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if key == u"+":

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self.proxy.Enable(dbus_interface = client_interface)

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elif key == u"-":

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self.proxy.Disable(dbus_interface = client_interface)

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elif key == u"a":

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self.proxy.Approve(dbus.Boolean(True, variant_level=1),

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dbus_interface = client_interface)

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elif key == u"d":

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self.proxy.Approve(dbus.Boolean(False, variant_level=1),

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dbus_interface = client_interface)

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elif key == u"r" or key == u"_" or key == u"ctrl k":

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self.server_proxy_object.RemoveClient(self.proxy

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.object_path)

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elif key == u"s":

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self.proxy.StartChecker(dbus_interface = client_interface)

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elif key == u"S":

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self.proxy.StopChecker(dbus_interface = client_interface)

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elif key == u"C":

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self.proxy.CheckedOK(dbus_interface = client_interface)

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# xxx

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# elif key == u"p" or key == "=":

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# self.proxy.pause()

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# elif key == u"u" or key == ":":

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# self.proxy.unpause()

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# elif key == u"RET":

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# self.open()

328

# elif key == u"+":

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# self.proxy.Approve(True)

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# elif key == u"-":

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# self.proxy.Approve(False)

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else:

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return key

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def property_changed(self, property=None, value=None,

336

*args, **kwargs):

337

"""Call self.update() if old value is not new value.

338

This overrides the method from MandosClientPropertyCache"""

339

property_name = unicode(property)

340

old_value = self.properties.get(property_name)

341

super(MandosClientWidget, self).property_changed(

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property=property, value=value, *args, **kwargs)

343

if self.properties.get(property_name) != old_value:

344

self.update()

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class ConstrainedListBox(urwid.ListBox):

348

"""Like a normal urwid.ListBox, but will consume all "up" or

349

"down" key presses, thus not allowing any containing widgets to

350

use them as an excuse to shift focus away from this widget.

351

"""

352

def keypress(self, (maxcol, maxrow), key):

353

ret = super(ConstrainedListBox, self).keypress((maxcol,

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maxrow), key)

355

if ret in (u"up", u"down"):

356

return

357

return ret

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359

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class UserInterface(object):

361

"""This is the entire user interface - the whole screen

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with boxes, lists of client widgets, etc.

363

"""

364

def __init__(self, max_log_length=1000):

365

DBusGMainLoop(set_as_default=True)

366

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self.screen = urwid.curses_display.Screen()

368

369

self.screen.register_palette((

370

(u"normal",

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u"default", u"default", None),

372

(u"bold",

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u"default", u"default", u"bold"),

374

(u"underline-blink",

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u"default", u"default", u"underline"),

376

(u"standout",

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u"default", u"default", u"standout"),

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(u"bold-underline-blink",

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u"default", u"default", (u"bold", u"underline")),

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(u"bold-standout",

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u"default", u"default", (u"bold", u"standout")),

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(u"underline-blink-standout",

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u"default", u"default", (u"underline", u"standout")),

384

(u"bold-underline-blink-standout",

385

u"default", u"default", (u"bold", u"underline",

386

u"standout")),

387

))

388

389

if urwid.supports_unicode():

390

self.divider = u"─" # \u2500

391

#self.divider = u"━" # \u2501

392

else:

393

#self.divider = u"-" # \u002d

394

self.divider = u"_" # \u005f

395

396

self.screen.start()

397

398

self.size = self.screen.get_cols_rows()

399

400

self.clients = urwid.SimpleListWalker([])

401

self.clients_dict = {}

402

403

# We will add Text widgets to this list

404

self.log = []

405

self.max_log_length = max_log_length

406

407

# We keep a reference to the log widget so we can remove it

408

# from the ListWalker without it getting destroyed

409

self.logbox = ConstrainedListBox(self.log)

410

411

# This keeps track of whether self.uilist currently has

412

# self.logbox in it or not

413

self.log_visible = True

414

self.log_wrap = u"any"

415

416

self.rebuild()

417

self.log_message_raw((u"bold",

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u"Mandos Monitor version " + version))

419

self.log_message_raw((u"bold",

420

u"q: Quit ?: Help"))

421

422

self.busname = domain + '.Mandos'

423

self.main_loop = gobject.MainLoop()

424

self.bus = dbus.SystemBus()

425

mandos_dbus_objc = self.bus.get_object(

426

self.busname, u"/", follow_name_owner_changes=True)

427

self.mandos_serv = dbus.Interface(mandos_dbus_objc,

428

dbus_interface

429

= server_interface)

430

try:

431

mandos_clients = (self.mandos_serv

432

.GetAllClientsWithProperties())

433

except dbus.exceptions.DBusException:

434

mandos_clients = dbus.Dictionary()

435

436

(self.mandos_serv

437

.connect_to_signal(u"ClientRemoved",

438

self.find_and_remove_client,

439

dbus_interface=server_interface,

440

byte_arrays=True))

441

(self.mandos_serv

442

.connect_to_signal(u"ClientAdded",

443

self.add_new_client,

444

dbus_interface=server_interface,

445

byte_arrays=True))

446

(self.mandos_serv

447

.connect_to_signal(u"ClientNotFound",

448

self.client_not_found,

449

dbus_interface=server_interface,

450

byte_arrays=True))

451

for path, client in mandos_clients.iteritems():

452

client_proxy_object = self.bus.get_object(self.busname,

453

path)

454

self.add_client(MandosClientWidget(server_proxy_object

455

=self.mandos_serv,

456

proxy_object

457

=client_proxy_object,

458

properties=client,

459

update_hook

460

=self.refresh,

461

delete_hook

462

=self.remove_client,

463

logger

464

=self.log_message),

465

path=path)

466

467

def client_not_found(self, fingerprint, address):

468

self.log_message((u"Client with address %s and fingerprint %s"

469

u" could not be found" % (address,

470

fingerprint)))

471

472

def rebuild(self):

473

"""This rebuilds the User Interface.

474

Call this when the widget layout needs to change"""

475

self.uilist = []

476

#self.uilist.append(urwid.ListBox(self.clients))

477

self.uilist.append(urwid.Frame(ConstrainedListBox(self.

478

clients),

479

#header=urwid.Divider(),

480

header=None,

481

footer=

482

urwid.Divider(div_char=

483

self.divider)))

484

if self.log_visible:

485

self.uilist.append(self.logbox)

486

pass

487

self.topwidget = urwid.Pile(self.uilist)

488

489

def log_message(self, message):

490

timestamp = datetime.datetime.now().isoformat()

491

self.log_message_raw(timestamp + u": " + message)

492

493

def log_message_raw(self, markup):

494

"""Add a log message to the log buffer."""

495

self.log.append(urwid.Text(markup, wrap=self.log_wrap))

496

if (self.max_log_length

497

and len(self.log) > self.max_log_length):

498

del self.log[0:len(self.log)-self.max_log_length-1]

499

self.logbox.set_focus(len(self.logbox.body.contents),

500

coming_from=u"above")

501

self.refresh()

502

503

def toggle_log_display(self):

504

"""Toggle visibility of the log buffer."""

505

self.log_visible = not self.log_visible

506

self.rebuild()

507

self.log_message(u"Log visibility changed to: "

508

+ unicode(self.log_visible))

509

510

def change_log_display(self):

511

"""Change type of log display.

512

Currently, this toggles wrapping of text lines."""

513

if self.log_wrap == u"clip":

514

self.log_wrap = u"any"

515

else:

516

self.log_wrap = u"clip"

517

for textwidget in self.log:

518

textwidget.set_wrap_mode(self.log_wrap)

519

self.log_message(u"Wrap mode: " + self.log_wrap)

520

521

def find_and_remove_client(self, path, name):

522

"""Find an client from its object path and remove it.

523

524

This is connected to the ClientRemoved signal from the

525

Mandos server object."""

526

try:

527

client = self.clients_dict[path]

528

except KeyError:

529

# not found?

530

return

531

self.remove_client(client, path)

532

533

def add_new_client(self, path):

534

client_proxy_object = self.bus.get_object(self.busname, path)

535

self.add_client(MandosClientWidget(server_proxy_object

536

=self.mandos_serv,

537

proxy_object

538

=client_proxy_object,

539

update_hook

540

=self.refresh,

541

delete_hook

542

=self.remove_client,

543

logger

544

=self.log_message),

545

path=path)

546

547

def add_client(self, client, path=None):

548

self.clients.append(client)

549

if path is None:

550

path = client.proxy.object_path

551

self.clients_dict[path] = client

552

self.clients.sort(None, lambda c: c.properties[u"Name"])

553

self.refresh()

554

555

def remove_client(self, client, path=None):

556

self.clients.remove(client)

557

if path is None:

558

path = client.proxy.object_path

559

del self.clients_dict[path]

560

if not self.clients_dict:

561

# Work around bug in Urwid 0.9.8.3 - if a SimpleListWalker

562

# is completely emptied, we need to recreate it.

563

self.clients = urwid.SimpleListWalker([])

564

self.rebuild()

565

self.refresh()

566

567

def refresh(self):

568

"""Redraw the screen"""

569

canvas = self.topwidget.render(self.size, focus=True)

570

self.screen.draw_screen(self.size, canvas)

571

572

def run(self):

573

"""Start the main loop and exit when it's done."""

574

self.refresh()

575

self._input_callback_tag = (gobject.io_add_watch

576

(sys.stdin.fileno(),

577

gobject.IO_IN,

578

self.process_input))

579

self.main_loop.run()

580

# Main loop has finished, we should close everything now

581

gobject.source_remove(self._input_callback_tag)

582

self.screen.stop()

583

584

def stop(self):

585

self.main_loop.quit()

586

587

def process_input(self, source, condition):

588

keys = self.screen.get_input()

589

translations = { u"ctrl n": u"down", # Emacs

590

u"ctrl p": u"up", # Emacs

591

u"ctrl v": u"page down", # Emacs

592

u"meta v": u"page up", # Emacs

593

u" ": u"page down", # less

594

u"f": u"page down", # less

595

u"b": u"page up", # less

596

u"j": u"down", # vi

597

u"k": u"up", # vi

598

}

599

for key in keys:

600

try:

601

key = translations[key]

602

except KeyError: # :-)

603

pass

604

605

if key == u"q" or key == u"Q":

606

self.stop()

607

break

608

elif key == u"window resize":

609

self.size = self.screen.get_cols_rows()

610

self.refresh()

611

elif key == u"\f": # Ctrl-L

612

self.refresh()

613

elif key == u"l" or key == u"D":

614

self.toggle_log_display()

615

self.refresh()

616

elif key == u"w" or key == u"i":

617

self.change_log_display()

618

self.refresh()

619

elif key == u"?" or key == u"f1" or key == u"esc":

620

if not self.log_visible:

621

self.log_visible = True

622

self.rebuild()

623

self.log_message_raw((u"bold",

624

u" ".

625

join((u"q: Quit",

626

u"?: Help",

627

u"l: Log window toggle",

628

u"TAB: Switch window",

629

u"w: Wrap (log)"))))

630

self.log_message_raw((u"bold",

631

u" "

632

.join((u"Clients:",

633

u"+: Enable",

634

u"-: Disable",

635

u"r: Remove",

636

u"s: Start new checker",

637

u"S: Stop checker",

638

u"C: Checker OK",

639

u"a: Approve",

640

u"d: Deny"))))

641

self.refresh()

642

elif key == u"tab":

643

if self.topwidget.get_focus() is self.logbox:

644

self.topwidget.set_focus(0)

645

else:

646

self.topwidget.set_focus(self.logbox)

647

self.refresh()

648

#elif (key == u"end" or key == u"meta >" or key == u"G"

649

# or key == u">"):

650

# pass # xxx end-of-buffer

651

#elif (key == u"home" or key == u"meta <" or key == u"g"

652

# or key == u"<"):

653

# pass # xxx beginning-of-buffer

654

#elif key == u"ctrl e" or key == u"$":

655

# pass # xxx move-end-of-line

656

#elif key == u"ctrl a" or key == u"^":

657

# pass # xxx move-beginning-of-line

658

#elif key == u"ctrl b" or key == u"meta (" or key == u"h":

659

# pass # xxx left

660

#elif key == u"ctrl f" or key == u"meta )" or key == u"l":

661

# pass # xxx right

662

#elif key == u"a":

663

# pass # scroll up log

664

#elif key == u"z":

665

# pass # scroll down log

666

elif self.topwidget.selectable():

667

self.topwidget.keypress(self.size, key)

668

self.refresh()

669

return True

670

671

ui = UserInterface()

672

try:

673

ui.run()

674

except KeyboardInterrupt:

675

ui.screen.stop()

676

except Exception, e:

677

ui.log_message(unicode(e))

678

ui.screen.stop()

679

raise