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- Committer: Björn Påhlsson
- Date: 2008-08-03 20:35:01 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 41.
- Revision ID: belorn@braxen-20080803203501-av7janz21ve7iq0b
mandosclient
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
Droping privileges
split gnutls function into global and session
* server.py (if_nametoindex): Redefine itself instead of using a
default keyword argument.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos.conf => server.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
6
6
# This program is partly derived from an example program for an Avahi
7
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# service publisher, downloaded from
8
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# <http://avahi.org/wiki/PythonPublishExample>. This includes the
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# methods "add", "remove", "server_state_changed",
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# "entry_group_state_changed", "cleanup", and "activate" in the
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# "AvahiService" class, and some lines in "main".
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# following functions: "AvahiService.add", "AvahiService.remove",
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# "server_state_changed", "entry_group_state_changed", and some lines
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# in "main".
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#
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# Everything else is
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# Copyright © 2008,2009 Teddy Hogeborn
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# Copyright © 2008,2009 Björn Påhlsson
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# Copyright © 2007-2008 Teddy Hogeborn & Björn Påhlsson
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see
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# <http://www.gnu.org/licenses/>.
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Contact the authors at <mandos@fukt.bsnet.se>.
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#
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from __future__ import division, with_statement, absolute_import
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from __future__ import division
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import SocketServer as socketserver
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import SocketServer
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import socket
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import optparse
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import select
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from optparse import OptionParser
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import datetime
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import errno
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import gnutls.crypto
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import gnutls.library.functions
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import gnutls.library.constants
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import gnutls.library.types
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import ConfigParser as configparser
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import ConfigParser
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import sys
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import re
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import os
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import signal
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from sets import Set
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import subprocess
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import atexit
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import stat
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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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import struct
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import fcntl
61
import functools
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import cPickle as pickle
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import multiprocessing
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65
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import dbus
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import dbus.service
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import gobject
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import avahi
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from dbus.mainloop.glib import DBusGMainLoop
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62
import ctypes
71
import ctypes.util
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import xml.dom.minidom
73
import inspect
74
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try:
76
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
77
except AttributeError:
78
try:
79
from IN import SO_BINDTODEVICE
80
except ImportError:
81
SO_BINDTODEVICE = None
82
83
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version = "1.0.14"
85
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logger = logging.getLogger(u'mandos')
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syslogger = (logging.handlers.SysLogHandler
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
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address = "/dev/log"))
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syslogger.setFormatter(logging.Formatter
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(u'Mandos [%(process)d]: %(levelname)s:'
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u' %(message)s'))
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# Brief description of the operation of this program:
65
#
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# This server announces itself as a Zeroconf service. Connecting
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# clients use the TLS protocol, with the unusual quirk that this
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# server program acts as a TLS "client" while a connecting client acts
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# as a TLS "server". The client (acting as a TLS "server") must
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# supply an OpenPGP certificate, and the fingerprint of this
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# certificate is used by this server to look up (in a list read from a
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# file at start time) which binary blob to give the client. No other
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# authentication or authorization is done by this server.
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logger = logging.Logger('mandos')
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syslogger = logging.handlers.SysLogHandler\
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
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syslogger.setFormatter(logging.Formatter\
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('%(levelname)s: %(message)s'))
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logger.addHandler(syslogger)
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console = logging.StreamHandler()
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console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
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u' %(levelname)s:'
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u' %(message)s'))
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logger.addHandler(console)
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multiprocessing_manager = multiprocessing.Manager()
82
del syslogger
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class AvahiError(Exception):
104
def __init__(self, value, *args, **kwargs):
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def __init__(self, value):
105
87
self.value = value
106
super(AvahiError, self).__init__(value, *args, **kwargs)
107
def __unicode__(self):
108
return unicode(repr(self.value))
88
def __str__(self):
89
return repr(self.value)
109
90
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class AvahiServiceError(AvahiError):
111
92
pass
115
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class AvahiService(object):
118
"""An Avahi (Zeroconf) service.
119
120
Attributes:
99
"""
121
100
interface: integer; avahi.IF_UNSPEC or an interface index.
122
101
Used to optionally bind to the specified interface.
123
name: string; Example: u'Mandos'
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type: string; Example: u'_mandos._tcp'.
125
See <http://www.dns-sd.org/ServiceTypes.html>
126
port: integer; what port to announce
127
TXT: list of strings; TXT record for the service
128
domain: string; Domain to publish on, default to .local if empty.
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host: string; Host to publish records for, default is localhost
130
max_renames: integer; maximum number of renames
131
rename_count: integer; counter so we only rename after collisions
132
a sensible number of times
133
group: D-Bus Entry Group
134
server: D-Bus Server
135
bus: dbus.SystemBus()
102
name = string; Example: "Mandos"
103
type = string; Example: "_mandos._tcp".
104
See <http://www.dns-sd.org/ServiceTypes.html>
105
port = integer; what port to announce
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TXT = list of strings; TXT record for the service
107
domain = string; Domain to publish on, default to .local if empty.
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host = string; Host to publish records for, default to localhost
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if empty.
110
max_renames = integer; maximum number of renames
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rename_count = integer; counter so we only rename after collisions
112
a sensible number of times
136
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"""
137
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def __init__(self, interface = avahi.IF_UNSPEC, name = None,
138
servicetype = None, port = None, TXT = None,
139
domain = u"", host = u"", max_renames = 32768,
140
protocol = avahi.PROTO_UNSPEC, bus = None):
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type = None, port = None, TXT = None, domain = "",
116
host = "", max_renames = 12):
117
"""An Avahi (Zeroconf) service. """
141
118
self.interface = interface
142
119
self.name = name
143
self.type = servicetype
120
self.type = type
144
121
self.port = port
145
self.TXT = TXT if TXT is not None else []
122
if TXT is None:
123
self.TXT = []
124
else:
125
self.TXT = TXT
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126
self.domain = domain
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127
self.host = host
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128
self.rename_count = 0
149
self.max_renames = max_renames
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self.protocol = protocol
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self.group = None # our entry group
152
self.server = None
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self.bus = bus
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129
def rename(self):
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130
"""Derived from the Avahi example code"""
156
131
if self.rename_count >= self.max_renames:
157
logger.critical(u"No suitable Zeroconf service name found"
158
u" after %i retries, exiting.",
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self.rename_count)
160
raise AvahiServiceError(u"Too many renames")
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self.name = self.server.GetAlternativeServiceName(self.name)
162
logger.info(u"Changing Zeroconf service name to %r ...",
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unicode(self.name))
164
syslogger.setFormatter(logging.Formatter
165
(u'Mandos (%s) [%%(process)d]:'
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u' %%(levelname)s: %%(message)s'
167
% self.name))
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logger.critical(u"No suitable service name found after %i"
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u" retries, exiting.", rename_count)
134
raise AvahiServiceError("Too many renames")
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name = server.GetAlternativeServiceName(name)
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logger.notice(u"Changing name to %r ...", name)
168
137
self.remove()
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138
self.add()
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self.rename_count += 1
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140
def remove(self):
172
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"""Derived from the Avahi example code"""
173
if self.group is not None:
174
self.group.Reset()
142
if group is not None:
143
group.Reset()
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def add(self):
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"""Derived from the Avahi example code"""
177
if self.group is None:
178
self.group = dbus.Interface(
179
self.bus.get_object(avahi.DBUS_NAME,
180
self.server.EntryGroupNew()),
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avahi.DBUS_INTERFACE_ENTRY_GROUP)
182
self.group.connect_to_signal('StateChanged',
183
self
184
.entry_group_state_changed)
185
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
186
self.name, self.type)
187
self.group.AddService(
188
self.interface,
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self.protocol,
190
dbus.UInt32(0), # flags
191
self.name, self.type,
192
self.domain, self.host,
193
dbus.UInt16(self.port),
194
avahi.string_array_to_txt_array(self.TXT))
195
self.group.Commit()
196
def entry_group_state_changed(self, state, error):
197
"""Derived from the Avahi example code"""
198
logger.debug(u"Avahi state change: %i", state)
199
200
if state == avahi.ENTRY_GROUP_ESTABLISHED:
201
logger.debug(u"Zeroconf service established.")
202
elif state == avahi.ENTRY_GROUP_COLLISION:
203
logger.warning(u"Zeroconf service name collision.")
204
self.rename()
205
elif state == avahi.ENTRY_GROUP_FAILURE:
206
logger.critical(u"Avahi: Error in group state changed %s",
207
unicode(error))
208
raise AvahiGroupError(u"State changed: %s"
209
% unicode(error))
210
def cleanup(self):
211
"""Derived from the Avahi example code"""
212
if self.group is not None:
213
self.group.Free()
214
self.group = None
215
def server_state_changed(self, state):
216
"""Derived from the Avahi example code"""
217
if state == avahi.SERVER_COLLISION:
218
logger.error(u"Zeroconf server name collision")
219
self.remove()
220
elif state == avahi.SERVER_RUNNING:
221
self.add()
222
def activate(self):
223
"""Derived from the Avahi example code"""
224
if self.server is None:
225
self.server = dbus.Interface(
226
self.bus.get_object(avahi.DBUS_NAME,
227
avahi.DBUS_PATH_SERVER),
228
avahi.DBUS_INTERFACE_SERVER)
229
self.server.connect_to_signal(u"StateChanged",
230
self.server_state_changed)
231
self.server_state_changed(self.server.GetState())
146
global group
147
if group is None:
148
group = dbus.Interface\
149
(bus.get_object(avahi.DBUS_NAME,
150
server.EntryGroupNew()),
151
avahi.DBUS_INTERFACE_ENTRY_GROUP)
152
group.connect_to_signal('StateChanged',
153
entry_group_state_changed)
154
logger.debug(u"Adding service '%s' of type '%s' ...",
155
service.name, service.type)
156
group.AddService(
157
self.interface, # interface
158
avahi.PROTO_INET6, # protocol
159
dbus.UInt32(0), # flags
160
self.name, self.type,
161
self.domain, self.host,
162
dbus.UInt16(self.port),
163
avahi.string_array_to_txt_array(self.TXT))
164
group.Commit()
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166
# From the Avahi example code:
167
group = None # our entry group
168
# End of Avahi example code
232
169
233
170
234
171
class Client(object):
235
172
"""A representation of a client host served by this server.
236
237
173
Attributes:
238
name: string; from the config file, used in log messages and
239
D-Bus identifiers
174
name: string; from the config file, used in log messages
240
175
fingerprint: string (40 or 32 hexadecimal digits); used to
241
176
uniquely identify the client
242
secret: bytestring; sent verbatim (over TLS) to client
243
host: string; available for use by the checker command
244
created: datetime.datetime(); (UTC) object creation
245
last_enabled: datetime.datetime(); (UTC)
246
enabled: bool()
247
last_checked_ok: datetime.datetime(); (UTC) or None
248
timeout: datetime.timedelta(); How long from last_checked_ok
249
until this client is disabled
250
interval: datetime.timedelta(); How often to start a new checker
251
disable_hook: If set, called by disable() as disable_hook(self)
252
checker: subprocess.Popen(); a running checker process used
253
to see if the client lives.
254
'None' if no process is running.
177
secret: bytestring; sent verbatim (over TLS) to client
178
fqdn: string (FQDN); available for use by the checker command
179
created: datetime.datetime(); object creation, not client host
180
last_checked_ok: datetime.datetime() or None if not yet checked OK
181
timeout: datetime.timedelta(); How long from last_checked_ok
182
until this client is invalid
183
interval: datetime.timedelta(); How often to start a new checker
184
stop_hook: If set, called by stop() as stop_hook(self)
185
checker: subprocess.Popen(); a running checker process used
186
to see if the client lives.
187
'None' if no process is running.
255
188
checker_initiator_tag: a gobject event source tag, or None
256
disable_initiator_tag: - '' -
189
stop_initiator_tag: - '' -
257
190
checker_callback_tag: - '' -
258
191
checker_command: string; External command which is run to check if
259
192
client lives. %() expansions are done at
260
193
runtime with vars(self) as dict, so that for
261
194
instance %(name)s can be used in the command.
262
current_checker_command: string; current running checker_command
263
approved_delay: datetime.timedelta(); Time to wait for approval
264
_approved: bool(); 'None' if not yet approved/disapproved
265
approved_duration: datetime.timedelta(); Duration of one approval
195
Private attibutes:
196
_timeout: Real variable for 'timeout'
197
_interval: Real variable for 'interval'
198
_timeout_milliseconds: Used when calling gobject.timeout_add()
199
_interval_milliseconds: - '' -
266
200
"""
267
268
@staticmethod
269
def _timedelta_to_milliseconds(td):
270
"Convert a datetime.timedelta() to milliseconds"
271
return ((td.days * 24 * 60 * 60 * 1000)
272
+ (td.seconds * 1000)
273
+ (td.microseconds // 1000))
274
275
def timeout_milliseconds(self):
276
"Return the 'timeout' attribute in milliseconds"
277
return self._timedelta_to_milliseconds(self.timeout)
278
279
def interval_milliseconds(self):
280
"Return the 'interval' attribute in milliseconds"
281
return self._timedelta_to_milliseconds(self.interval)
282
283
def approved_delay_milliseconds(self):
284
return self._timedelta_to_milliseconds(self.approved_delay)
285
286
def __init__(self, name = None, disable_hook=None, config=None):
287
"""Note: the 'checker' key in 'config' sets the
288
'checker_command' attribute and *not* the 'checker'
289
attribute."""
201
def _set_timeout(self, timeout):
202
"Setter function for 'timeout' attribute"
203
self._timeout = timeout
204
self._timeout_milliseconds = ((self.timeout.days
205
* 24 * 60 * 60 * 1000)
206
+ (self.timeout.seconds * 1000)
207
+ (self.timeout.microseconds
208
// 1000))
209
timeout = property(lambda self: self._timeout,
210
_set_timeout)
211
del _set_timeout
212
def _set_interval(self, interval):
213
"Setter function for 'interval' attribute"
214
self._interval = interval
215
self._interval_milliseconds = ((self.interval.days
216
* 24 * 60 * 60 * 1000)
217
+ (self.interval.seconds
218
* 1000)
219
+ (self.interval.microseconds
220
// 1000))
221
interval = property(lambda self: self._interval,
222
_set_interval)
223
del _set_interval
224
def __init__(self, name=None, stop_hook=None, fingerprint=None,
225
secret=None, secfile=None, fqdn=None, timeout=None,
226
interval=-1, checker=None):
227
"""Note: the 'checker' argument sets the 'checker_command'
228
attribute and not the 'checker' attribute.."""
290
229
self.name = name
291
if config is None:
292
config = {}
293
230
logger.debug(u"Creating client %r", self.name)
294
# Uppercase and remove spaces from fingerprint for later
295
# comparison purposes with return value from the fingerprint()
296
# function
297
self.fingerprint = (config[u"fingerprint"].upper()
298
.replace(u" ", u""))
231
# Uppercase and remove spaces from fingerprint
232
# for later comparison purposes with return value of
233
# the fingerprint() function
234
self.fingerprint = fingerprint.upper().replace(u" ", u"")
299
235
logger.debug(u" Fingerprint: %s", self.fingerprint)
300
if u"secret" in config:
301
self.secret = config[u"secret"].decode(u"base64")
302
elif u"secfile" in config:
303
with open(os.path.expanduser(os.path.expandvars
304
(config[u"secfile"])),
305
"rb") as secfile:
306
self.secret = secfile.read()
236
if secret:
237
self.secret = secret.decode(u"base64")
238
elif secfile:
239
sf = open(secfile)
240
self.secret = sf.read()
241
sf.close()
307
242
else:
308
#XXX Need to allow secret on demand!
309
243
raise TypeError(u"No secret or secfile for client %s"
310
244
% self.name)
311
self.host = config.get(u"host", u"")
312
self.created = datetime.datetime.utcnow()
313
self.enabled = False
314
self.last_enabled = None
245
self.fqdn = fqdn
246
self.created = datetime.datetime.now()
315
247
self.last_checked_ok = None
316
self.timeout = string_to_delta(config[u"timeout"])
317
self.interval = string_to_delta(config[u"interval"])
318
self.disable_hook = disable_hook
248
self.timeout = string_to_delta(timeout)
249
self.interval = string_to_delta(interval)
250
self.stop_hook = stop_hook
319
251
self.checker = None
320
252
self.checker_initiator_tag = None
321
self.disable_initiator_tag = None
253
self.stop_initiator_tag = None
322
254
self.checker_callback_tag = None
323
self.checker_command = config[u"checker"]
324
self.current_checker_command = None
325
self.last_connect = None
326
self.approvals_pending = 0
327
self._approved = None
328
self.approved_by_default = config.get(u"approved_by_default",
329
True)
330
self.approved_delay = string_to_delta(
331
config[u"approved_delay"])
332
self.approved_duration = string_to_delta(
333
config[u"approved_duration"])
334
self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())
335
336
def send_changedstate(self):
337
self.changedstate.acquire()
338
self.changedstate.notify_all()
339
self.changedstate.release()
340
341
def enable(self):
255
self.check_command = checker
256
def start(self):
342
257
"""Start this client's checker and timeout hooks"""
343
if getattr(self, u"enabled", False):
344
# Already enabled
345
return
346
self.send_changedstate()
347
self.last_enabled = datetime.datetime.utcnow()
348
258
# Schedule a new checker to be started an 'interval' from now,
349
259
# and every interval from then on.
350
self.checker_initiator_tag = (gobject.timeout_add
351
(self.interval_milliseconds(),
352
self.start_checker))
353
# Schedule a disable() when 'timeout' has passed
354
self.disable_initiator_tag = (gobject.timeout_add
355
(self.timeout_milliseconds(),
356
self.disable))
357
self.enabled = True
260
self.checker_initiator_tag = gobject.timeout_add\
261
(self._interval_milliseconds,
262
self.start_checker)
358
263
# Also start a new checker *right now*.
359
264
self.start_checker()
360
361
def disable(self, quiet=True):
362
"""Disable this client."""
363
if not getattr(self, "enabled", False):
265
# Schedule a stop() when 'timeout' has passed
266
self.stop_initiator_tag = gobject.timeout_add\
267
(self._timeout_milliseconds,
268
self.stop)
269
def stop(self):
270
"""Stop this client.
271
The possibility that a client might be restarted is left open,
272
but not currently used."""
273
# If this client doesn't have a secret, it is already stopped.
274
if self.secret:
275
logger.debug(u"Stopping client %s", self.name)
276
self.secret = None
277
else:
364
278
return False
365
if not quiet:
366
self.send_changedstate()
367
if not quiet:
368
logger.info(u"Disabling client %s", self.name)
369
if getattr(self, u"disable_initiator_tag", False):
370
gobject.source_remove(self.disable_initiator_tag)
371
self.disable_initiator_tag = None
372
if getattr(self, u"checker_initiator_tag", False):
279
if getattr(self, "stop_initiator_tag", False):
280
gobject.source_remove(self.stop_initiator_tag)
281
self.stop_initiator_tag = None
282
if getattr(self, "checker_initiator_tag", False):
373
283
gobject.source_remove(self.checker_initiator_tag)
374
284
self.checker_initiator_tag = None
375
285
self.stop_checker()
376
if self.disable_hook:
377
self.disable_hook(self)
378
self.enabled = False
286
if self.stop_hook:
287
self.stop_hook(self)
379
288
# Do not run this again if called by a gobject.timeout_add
380
289
return False
381
382
290
def __del__(self):
383
self.disable_hook = None
384
self.disable()
385
386
def checker_callback(self, pid, condition, command):
291
self.stop_hook = None
292
self.stop()
293
def checker_callback(self, pid, condition):
387
294
"""The checker has completed, so take appropriate actions."""
295
now = datetime.datetime.now()
388
296
self.checker_callback_tag = None
389
297
self.checker = None
390
if os.WIFEXITED(condition):
391
exitstatus = os.WEXITSTATUS(condition)
392
if exitstatus == 0:
393
logger.info(u"Checker for %(name)s succeeded",
394
vars(self))
395
self.checked_ok()
396
else:
397
logger.info(u"Checker for %(name)s failed",
398
vars(self))
399
else:
298
if os.WIFEXITED(condition) \
299
and (os.WEXITSTATUS(condition) == 0):
300
logger.debug(u"Checker for %(name)s succeeded",
301
vars(self))
302
self.last_checked_ok = now
303
gobject.source_remove(self.stop_initiator_tag)
304
self.stop_initiator_tag = gobject.timeout_add\
305
(self._timeout_milliseconds,
306
self.stop)
307
elif not os.WIFEXITED(condition):
400
308
logger.warning(u"Checker for %(name)s crashed?",
401
309
vars(self))
402
403
def checked_ok(self):
404
"""Bump up the timeout for this client.
405
406
This should only be called when the client has been seen,
407
alive and well.
408
"""
409
self.last_checked_ok = datetime.datetime.utcnow()
410
gobject.source_remove(self.disable_initiator_tag)
411
self.disable_initiator_tag = (gobject.timeout_add
412
(self.timeout_milliseconds(),
413
self.disable))
414
310
else:
311
logger.debug(u"Checker for %(name)s failed",
312
vars(self))
415
313
def start_checker(self):
416
314
"""Start a new checker subprocess if one is not running.
417
418
315
If a checker already exists, leave it running and do
419
316
nothing."""
420
317
# The reason for not killing a running checker is that if we
423
320
# client would inevitably timeout, since no checker would get
424
321
# a chance to run to completion. If we instead leave running
425
322
# checkers alone, the checker would have to take more time
426
# than 'timeout' for the client to be disabled, which is as it
427
# should be.
428
429
# If a checker exists, make sure it is not a zombie
430
try:
431
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
432
except (AttributeError, OSError), error:
433
if (isinstance(error, OSError)
434
and error.errno != errno.ECHILD):
435
raise error
436
else:
437
if pid:
438
logger.warning(u"Checker was a zombie")
439
gobject.source_remove(self.checker_callback_tag)
440
self.checker_callback(pid, status,
441
self.current_checker_command)
442
# Start a new checker if needed
323
# than 'timeout' for the client to be declared invalid, which
324
# is as it should be.
443
325
if self.checker is None:
444
326
try:
445
# In case checker_command has exactly one % operator
446
command = self.checker_command % self.host
327
# In case check_command has exactly one % operator
328
command = self.check_command % self.fqdn
447
329
except TypeError:
448
330
# Escape attributes for the shell
449
escaped_attrs = dict((key,
450
re.escape(unicode(str(val),
451
errors=
452
u'replace')))
331
escaped_attrs = dict((key, re.escape(str(val)))
453
332
for key, val in
454
333
vars(self).iteritems())
455
334
try:
456
command = self.checker_command % escaped_attrs
335
command = self.check_command % escaped_attrs
457
336
except TypeError, error:
458
337
logger.error(u'Could not format string "%s":'
459
u' %s', self.checker_command, error)
338
u' %s', self.check_command, error)
460
339
return True # Try again later
461
self.current_checker_command = command
462
340
try:
463
logger.info(u"Starting checker %r for %s",
464
command, self.name)
465
# We don't need to redirect stdout and stderr, since
466
# in normal mode, that is already done by daemon(),
467
# and in debug mode we don't want to. (Stdin is
468
# always replaced by /dev/null.)
341
logger.debug(u"Starting checker %r for %s",
342
command, self.name)
469
343
self.checker = subprocess.Popen(command,
470
344
close_fds=True,
471
shell=True, cwd=u"/")
472
self.checker_callback_tag = (gobject.child_watch_add
473
(self.checker.pid,
474
self.checker_callback,
475
data=command))
476
# The checker may have completed before the gobject
477
# watch was added. Check for this.
478
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
479
if pid:
480
gobject.source_remove(self.checker_callback_tag)
481
self.checker_callback(pid, status, command)
482
except OSError, error:
345
shell=True, cwd="/")
346
self.checker_callback_tag = gobject.child_watch_add\
347
(self.checker.pid,
348
self.checker_callback)
349
except subprocess.OSError, error:
483
350
logger.error(u"Failed to start subprocess: %s",
484
351
error)
485
352
# Re-run this periodically if run by gobject.timeout_add
486
353
return True
487
488
354
def stop_checker(self):
489
355
"""Force the checker process, if any, to stop."""
490
356
if self.checker_callback_tag:
491
357
gobject.source_remove(self.checker_callback_tag)
492
358
self.checker_callback_tag = None
493
if getattr(self, u"checker", None) is None:
359
if getattr(self, "checker", None) is None:
494
360
return
495
logger.debug(u"Stopping checker for %(name)s", vars(self))
361
logger.debug("Stopping checker for %(name)s", vars(self))
496
362
try:
497
363
os.kill(self.checker.pid, signal.SIGTERM)
498
#time.sleep(0.5)
364
#os.sleep(0.5)
499
365
#if self.checker.poll() is None:
500
366
# os.kill(self.checker.pid, signal.SIGKILL)
501
367
except OSError, error:
502
368
if error.errno != errno.ESRCH: # No such process
503
369
raise
504
370
self.checker = None
505
506
def dbus_service_property(dbus_interface, signature=u"v",
507
access=u"readwrite", byte_arrays=False):
508
"""Decorators for marking methods of a DBusObjectWithProperties to
509
become properties on the D-Bus.
510
511
The decorated method will be called with no arguments by "Get"
512
and with one argument by "Set".
513
514
The parameters, where they are supported, are the same as
515
dbus.service.method, except there is only "signature", since the
516
type from Get() and the type sent to Set() is the same.
517
"""
518
# Encoding deeply encoded byte arrays is not supported yet by the
519
# "Set" method, so we fail early here:
520
if byte_arrays and signature != u"ay":
521
raise ValueError(u"Byte arrays not supported for non-'ay'"
522
u" signature %r" % signature)
523
def decorator(func):
524
func._dbus_is_property = True
525
func._dbus_interface = dbus_interface
526
func._dbus_signature = signature
527
func._dbus_access = access
528
func._dbus_name = func.__name__
529
if func._dbus_name.endswith(u"_dbus_property"):
530
func._dbus_name = func._dbus_name[:-14]
531
func._dbus_get_args_options = {u'byte_arrays': byte_arrays }
532
return func
533
return decorator
534
535
536
class DBusPropertyException(dbus.exceptions.DBusException):
537
"""A base class for D-Bus property-related exceptions
538
"""
539
def __unicode__(self):
540
return unicode(str(self))
541
542
543
class DBusPropertyAccessException(DBusPropertyException):
544
"""A property's access permissions disallows an operation.
545
"""
546
pass
547
548
549
class DBusPropertyNotFound(DBusPropertyException):
550
"""An attempt was made to access a non-existing property.
551
"""
552
pass
553
554
555
class DBusObjectWithProperties(dbus.service.Object):
556
"""A D-Bus object with properties.
557
558
Classes inheriting from this can use the dbus_service_property
559
decorator to expose methods as D-Bus properties. It exposes the
560
standard Get(), Set(), and GetAll() methods on the D-Bus.
561
"""
562
563
@staticmethod
564
def _is_dbus_property(obj):
565
return getattr(obj, u"_dbus_is_property", False)
566
567
def _get_all_dbus_properties(self):
568
"""Returns a generator of (name, attribute) pairs
569
"""
570
return ((prop._dbus_name, prop)
571
for name, prop in
572
inspect.getmembers(self, self._is_dbus_property))
573
574
def _get_dbus_property(self, interface_name, property_name):
575
"""Returns a bound method if one exists which is a D-Bus
576
property with the specified name and interface.
577
"""
578
for name in (property_name,
579
property_name + u"_dbus_property"):
580
prop = getattr(self, name, None)
581
if (prop is None
582
or not self._is_dbus_property(prop)
583
or prop._dbus_name != property_name
584
or (interface_name and prop._dbus_interface
585
and interface_name != prop._dbus_interface)):
586
continue
587
return prop
588
# No such property
589
raise DBusPropertyNotFound(self.dbus_object_path + u":"
590
+ interface_name + u"."
591
+ property_name)
592
593
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ss",
594
out_signature=u"v")
595
def Get(self, interface_name, property_name):
596
"""Standard D-Bus property Get() method, see D-Bus standard.
597
"""
598
prop = self._get_dbus_property(interface_name, property_name)
599
if prop._dbus_access == u"write":
600
raise DBusPropertyAccessException(property_name)
601
value = prop()
602
if not hasattr(value, u"variant_level"):
603
return value
604
return type(value)(value, variant_level=value.variant_level+1)
605
606
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"ssv")
607
def Set(self, interface_name, property_name, value):
608
"""Standard D-Bus property Set() method, see D-Bus standard.
609
"""
610
prop = self._get_dbus_property(interface_name, property_name)
611
if prop._dbus_access == u"read":
612
raise DBusPropertyAccessException(property_name)
613
if prop._dbus_get_args_options[u"byte_arrays"]:
614
# The byte_arrays option is not supported yet on
615
# signatures other than "ay".
616
if prop._dbus_signature != u"ay":
617
raise ValueError
618
value = dbus.ByteArray(''.join(unichr(byte)
619
for byte in value))
620
prop(value)
621
622
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature=u"s",
623
out_signature=u"a{sv}")
624
def GetAll(self, interface_name):
625
"""Standard D-Bus property GetAll() method, see D-Bus
626
standard.
627
628
Note: Will not include properties with access="write".
629
"""
630
all = {}
631
for name, prop in self._get_all_dbus_properties():
632
if (interface_name
633
and interface_name != prop._dbus_interface):
634
# Interface non-empty but did not match
635
continue
636
# Ignore write-only properties
637
if prop._dbus_access == u"write":
638
continue
639
value = prop()
640
if not hasattr(value, u"variant_level"):
641
all[name] = value
642
continue
643
all[name] = type(value)(value, variant_level=
644
value.variant_level+1)
645
return dbus.Dictionary(all, signature=u"sv")
646
647
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
648
out_signature=u"s",
649
path_keyword='object_path',
650
connection_keyword='connection')
651
def Introspect(self, object_path, connection):
652
"""Standard D-Bus method, overloaded to insert property tags.
653
"""
654
xmlstring = dbus.service.Object.Introspect(self, object_path,
655
connection)
656
try:
657
document = xml.dom.minidom.parseString(xmlstring)
658
def make_tag(document, name, prop):
659
e = document.createElement(u"property")
660
e.setAttribute(u"name", name)
661
e.setAttribute(u"type", prop._dbus_signature)
662
e.setAttribute(u"access", prop._dbus_access)
663
return e
664
for if_tag in document.getElementsByTagName(u"interface"):
665
for tag in (make_tag(document, name, prop)
666
for name, prop
667
in self._get_all_dbus_properties()
668
if prop._dbus_interface
669
== if_tag.getAttribute(u"name")):
670
if_tag.appendChild(tag)
671
# Add the names to the return values for the
672
# "org.freedesktop.DBus.Properties" methods
673
if (if_tag.getAttribute(u"name")
674
== u"org.freedesktop.DBus.Properties"):
675
for cn in if_tag.getElementsByTagName(u"method"):
676
if cn.getAttribute(u"name") == u"Get":
677
for arg in cn.getElementsByTagName(u"arg"):
678
if (arg.getAttribute(u"direction")
679
== u"out"):
680
arg.setAttribute(u"name", u"value")
681
elif cn.getAttribute(u"name") == u"GetAll":
682
for arg in cn.getElementsByTagName(u"arg"):
683
if (arg.getAttribute(u"direction")
684
== u"out"):
685
arg.setAttribute(u"name", u"props")
686
xmlstring = document.toxml(u"utf-8")
687
document.unlink()
688
except (AttributeError, xml.dom.DOMException,
689
xml.parsers.expat.ExpatError), error:
690
logger.error(u"Failed to override Introspection method",
691
error)
692
return xmlstring
693
694
695
class ClientDBus(Client, DBusObjectWithProperties):
696
"""A Client class using D-Bus
697
698
Attributes:
699
dbus_object_path: dbus.ObjectPath
700
bus: dbus.SystemBus()
701
"""
702
# dbus.service.Object doesn't use super(), so we can't either.
703
704
def __init__(self, bus = None, *args, **kwargs):
705
self._approvals_pending = 0
706
self.bus = bus
707
Client.__init__(self, *args, **kwargs)
708
# Only now, when this client is initialized, can it show up on
709
# the D-Bus
710
self.dbus_object_path = (dbus.ObjectPath
711
(u"/clients/"
712
+ self.name.replace(u".", u"_")))
713
DBusObjectWithProperties.__init__(self, self.bus,
714
self.dbus_object_path)
715
716
def _get_approvals_pending(value):
717
return self._approvals_pending
718
def _set_approvals_pending(value):
719
old_value = self._approvals_pending
720
self._approvals_pending = value
721
bval = bool(value)
722
if bval is bool(old_value):
723
dbus_bool = dbus.Boolean(bval, variant_level=1)
724
self.PropertyChanged(dbus.String(u"approved_pending"),
725
dbus_bool)
726
return value
727
approvals_pending = property(_get_approvals_pending,
728
_set_approvals_pending)
729
del _get_approvals_pending, _set_approvals_pending
730
731
@staticmethod
732
def _datetime_to_dbus(dt, variant_level=0):
733
"""Convert a UTC datetime.datetime() to a D-Bus type."""
734
return dbus.String(dt.isoformat(),
735
variant_level=variant_level)
736
737
def enable(self):
738
oldstate = getattr(self, u"enabled", False)
739
r = Client.enable(self)
740
if oldstate != self.enabled:
741
# Emit D-Bus signals
742
self.PropertyChanged(dbus.String(u"enabled"),
743
dbus.Boolean(True, variant_level=1))
744
self.PropertyChanged(
745
dbus.String(u"last_enabled"),
746
self._datetime_to_dbus(self.last_enabled,
747
variant_level=1))
748
return r
749
750
def disable(self, quiet = False):
751
oldstate = getattr(self, u"enabled", False)
752
r = Client.disable(self, quiet=quiet)
753
if not quiet and oldstate != self.enabled:
754
# Emit D-Bus signal
755
self.PropertyChanged(dbus.String(u"enabled"),
756
dbus.Boolean(False, variant_level=1))
757
return r
758
759
def __del__(self, *args, **kwargs):
760
try:
761
self.remove_from_connection()
762
except LookupError:
763
pass
764
if hasattr(DBusObjectWithProperties, u"__del__"):
765
DBusObjectWithProperties.__del__(self, *args, **kwargs)
766
Client.__del__(self, *args, **kwargs)
767
768
def checker_callback(self, pid, condition, command,
769
*args, **kwargs):
770
self.checker_callback_tag = None
771
self.checker = None
772
# Emit D-Bus signal
773
self.PropertyChanged(dbus.String(u"checker_running"),
774
dbus.Boolean(False, variant_level=1))
775
if os.WIFEXITED(condition):
776
exitstatus = os.WEXITSTATUS(condition)
777
# Emit D-Bus signal
778
self.CheckerCompleted(dbus.Int16(exitstatus),
779
dbus.Int64(condition),
780
dbus.String(command))
781
else:
782
# Emit D-Bus signal
783
self.CheckerCompleted(dbus.Int16(-1),
784
dbus.Int64(condition),
785
dbus.String(command))
786
787
return Client.checker_callback(self, pid, condition, command,
788
*args, **kwargs)
789
790
def checked_ok(self, *args, **kwargs):
791
r = Client.checked_ok(self, *args, **kwargs)
792
# Emit D-Bus signal
793
self.PropertyChanged(
794
dbus.String(u"last_checked_ok"),
795
(self._datetime_to_dbus(self.last_checked_ok,
796
variant_level=1)))
797
return r
798
799
def start_checker(self, *args, **kwargs):
800
old_checker = self.checker
801
if self.checker is not None:
802
old_checker_pid = self.checker.pid
803
else:
804
old_checker_pid = None
805
r = Client.start_checker(self, *args, **kwargs)
806
# Only if new checker process was started
807
if (self.checker is not None
808
and old_checker_pid != self.checker.pid):
809
# Emit D-Bus signal
810
self.CheckerStarted(self.current_checker_command)
811
self.PropertyChanged(
812
dbus.String(u"checker_running"),
813
dbus.Boolean(True, variant_level=1))
814
return r
815
816
def stop_checker(self, *args, **kwargs):
817
old_checker = getattr(self, u"checker", None)
818
r = Client.stop_checker(self, *args, **kwargs)
819
if (old_checker is not None
820
and getattr(self, u"checker", None) is None):
821
self.PropertyChanged(dbus.String(u"checker_running"),
822
dbus.Boolean(False, variant_level=1))
823
return r
824
825
def _reset_approved(self):
826
self._approved = None
827
return False
828
829
def approve(self, value=True):
830
self._approved = value
831
gobject.timeout_add(self._timedelta_to_milliseconds(self.approved_duration, self._reset_approved))
832
833
834
## D-Bus methods, signals & properties
835
_interface = u"se.bsnet.fukt.Mandos.Client"
836
837
## Signals
838
839
# CheckerCompleted - signal
840
@dbus.service.signal(_interface, signature=u"nxs")
841
def CheckerCompleted(self, exitcode, waitstatus, command):
842
"D-Bus signal"
843
pass
844
845
# CheckerStarted - signal
846
@dbus.service.signal(_interface, signature=u"s")
847
def CheckerStarted(self, command):
848
"D-Bus signal"
849
pass
850
851
# PropertyChanged - signal
852
@dbus.service.signal(_interface, signature=u"sv")
853
def PropertyChanged(self, property, value):
854
"D-Bus signal"
855
pass
856
857
# GotSecret - signal
858
@dbus.service.signal(_interface)
859
def GotSecret(self):
860
"D-Bus signal"
861
pass
862
863
# Rejected - signal
864
@dbus.service.signal(_interface, signature=u"s")
865
def Rejected(self, reason):
866
"D-Bus signal"
867
pass
868
869
# NeedApproval - signal
870
@dbus.service.signal(_interface, signature=u"db")
871
def NeedApproval(self, timeout, default):
872
"D-Bus signal"
873
pass
874
875
## Methods
876
877
# Approve - method
878
@dbus.service.method(_interface, in_signature=u"b")
879
def Approve(self, value):
880
self.approve(value)
881
882
# CheckedOK - method
883
@dbus.service.method(_interface)
884
def CheckedOK(self):
885
return self.checked_ok()
886
887
# Enable - method
888
@dbus.service.method(_interface)
889
def Enable(self):
890
"D-Bus method"
891
self.enable()
892
893
# StartChecker - method
894
@dbus.service.method(_interface)
895
def StartChecker(self):
896
"D-Bus method"
897
self.start_checker()
898
899
# Disable - method
900
@dbus.service.method(_interface)
901
def Disable(self):
902
"D-Bus method"
903
self.disable()
904
905
# StopChecker - method
906
@dbus.service.method(_interface)
907
def StopChecker(self):
908
self.stop_checker()
909
910
## Properties
911
912
# approved_pending - property
913
@dbus_service_property(_interface, signature=u"b", access=u"read")
914
def approved_pending_dbus_property(self):
915
return dbus.Boolean(bool(self.approvals_pending))
916
917
# approved_by_default - property
918
@dbus_service_property(_interface, signature=u"b",
919
access=u"readwrite")
920
def approved_by_default_dbus_property(self):
921
return dbus.Boolean(self.approved_by_default)
922
923
# approved_delay - property
924
@dbus_service_property(_interface, signature=u"t",
925
access=u"readwrite")
926
def approved_delay_dbus_property(self):
927
return dbus.UInt64(self.approved_delay_milliseconds())
928
929
# approved_duration - property
930
@dbus_service_property(_interface, signature=u"t",
931
access=u"readwrite")
932
def approved_duration_dbus_property(self):
933
return dbus.UInt64(self._timedelta_to_milliseconds(
934
self.approved_duration))
935
936
# name - property
937
@dbus_service_property(_interface, signature=u"s", access=u"read")
938
def name_dbus_property(self):
939
return dbus.String(self.name)
940
941
# fingerprint - property
942
@dbus_service_property(_interface, signature=u"s", access=u"read")
943
def fingerprint_dbus_property(self):
944
return dbus.String(self.fingerprint)
945
946
# host - property
947
@dbus_service_property(_interface, signature=u"s",
948
access=u"readwrite")
949
def host_dbus_property(self, value=None):
950
if value is None: # get
951
return dbus.String(self.host)
952
self.host = value
953
# Emit D-Bus signal
954
self.PropertyChanged(dbus.String(u"host"),
955
dbus.String(value, variant_level=1))
956
957
# created - property
958
@dbus_service_property(_interface, signature=u"s", access=u"read")
959
def created_dbus_property(self):
960
return dbus.String(self._datetime_to_dbus(self.created))
961
962
# last_enabled - property
963
@dbus_service_property(_interface, signature=u"s", access=u"read")
964
def last_enabled_dbus_property(self):
965
if self.last_enabled is None:
966
return dbus.String(u"")
967
return dbus.String(self._datetime_to_dbus(self.last_enabled))
968
969
# enabled - property
970
@dbus_service_property(_interface, signature=u"b",
971
access=u"readwrite")
972
def enabled_dbus_property(self, value=None):
973
if value is None: # get
974
return dbus.Boolean(self.enabled)
975
if value:
976
self.enable()
977
else:
978
self.disable()
979
980
# last_checked_ok - property
981
@dbus_service_property(_interface, signature=u"s",
982
access=u"readwrite")
983
def last_checked_ok_dbus_property(self, value=None):
984
if value is not None:
985
self.checked_ok()
986
return
371
def still_valid(self):
372
"""Has the timeout not yet passed for this client?"""
373
now = datetime.datetime.now()
987
374
if self.last_checked_ok is None:
988
return dbus.String(u"")
989
return dbus.String(self._datetime_to_dbus(self
990
.last_checked_ok))
991
992
# timeout - property
993
@dbus_service_property(_interface, signature=u"t",
994
access=u"readwrite")
995
def timeout_dbus_property(self, value=None):
996
if value is None: # get
997
return dbus.UInt64(self.timeout_milliseconds())
998
self.timeout = datetime.timedelta(0, 0, 0, value)
999
# Emit D-Bus signal
1000
self.PropertyChanged(dbus.String(u"timeout"),
1001
dbus.UInt64(value, variant_level=1))
1002
if getattr(self, u"disable_initiator_tag", None) is None:
1003
return
1004
# Reschedule timeout
1005
gobject.source_remove(self.disable_initiator_tag)
1006
self.disable_initiator_tag = None
1007
time_to_die = (self.
1008
_timedelta_to_milliseconds((self
1009
.last_checked_ok
1010
+ self.timeout)
1011
- datetime.datetime
1012
.utcnow()))
1013
if time_to_die <= 0:
1014
# The timeout has passed
1015
self.disable()
1016
else:
1017
self.disable_initiator_tag = (gobject.timeout_add
1018
(time_to_die, self.disable))
1019
1020
# interval - property
1021
@dbus_service_property(_interface, signature=u"t",
1022
access=u"readwrite")
1023
def interval_dbus_property(self, value=None):
1024
if value is None: # get
1025
return dbus.UInt64(self.interval_milliseconds())
1026
self.interval = datetime.timedelta(0, 0, 0, value)
1027
# Emit D-Bus signal
1028
self.PropertyChanged(dbus.String(u"interval"),
1029
dbus.UInt64(value, variant_level=1))
1030
if getattr(self, u"checker_initiator_tag", None) is None:
1031
return
1032
# Reschedule checker run
1033
gobject.source_remove(self.checker_initiator_tag)
1034
self.checker_initiator_tag = (gobject.timeout_add
1035
(value, self.start_checker))
1036
self.start_checker() # Start one now, too
1037
1038
# checker - property
1039
@dbus_service_property(_interface, signature=u"s",
1040
access=u"readwrite")
1041
def checker_dbus_property(self, value=None):
1042
if value is None: # get
1043
return dbus.String(self.checker_command)
1044
self.checker_command = value
1045
# Emit D-Bus signal
1046
self.PropertyChanged(dbus.String(u"checker"),
1047
dbus.String(self.checker_command,
1048
variant_level=1))
1049
1050
# checker_running - property
1051
@dbus_service_property(_interface, signature=u"b",
1052
access=u"readwrite")
1053
def checker_running_dbus_property(self, value=None):
1054
if value is None: # get
1055
return dbus.Boolean(self.checker is not None)
1056
if value:
1057
self.start_checker()
1058
else:
1059
self.stop_checker()
1060
1061
# object_path - property
1062
@dbus_service_property(_interface, signature=u"o", access=u"read")
1063
def object_path_dbus_property(self):
1064
return self.dbus_object_path # is already a dbus.ObjectPath
1065
1066
# secret = property
1067
@dbus_service_property(_interface, signature=u"ay",
1068
access=u"write", byte_arrays=True)
1069
def secret_dbus_property(self, value):
1070
self.secret = str(value)
1071
1072
del _interface
1073
1074
1075
class ProxyClient(object):
1076
def __init__(self, child_pipe, fpr, address):
1077
self._pipe = child_pipe
1078
self._pipe.send(('init', fpr, address))
1079
if not self._pipe.recv():
1080
raise KeyError()
1081
1082
def __getattribute__(self, name):
1083
if(name == '_pipe'):
1084
return super(ProxyClient, self).__getattribute__(name)
1085
self._pipe.send(('getattr', name))
1086
data = self._pipe.recv()
1087
if data[0] == 'data':
1088
return data[1]
1089
if data[0] == 'function':
1090
def func(*args, **kwargs):
1091
self._pipe.send(('funcall', name, args, kwargs))
1092
return self._pipe.recv()[1]
1093
return func
1094
1095
def __setattr__(self, name, value):
1096
if(name == '_pipe'):
1097
return super(ProxyClient, self).__setattr__(name, value)
1098
self._pipe.send(('setattr', name, value))
1099
1100
1101
class ClientHandler(socketserver.BaseRequestHandler, object):
1102
"""A class to handle client connections.
1103
1104
Instantiated once for each connection to handle it.
375
return now < (self.created + self.timeout)
376
else:
377
return now < (self.last_checked_ok + self.timeout)
378
379
380
def peer_certificate(session):
381
"Return the peer's OpenPGP certificate as a bytestring"
382
# If not an OpenPGP certificate...
383
if gnutls.library.functions.gnutls_certificate_type_get\
384
(session._c_object) \
385
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
386
# ...do the normal thing
387
return session.peer_certificate
388
list_size = ctypes.c_uint()
389
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
390
(session._c_object, ctypes.byref(list_size))
391
if list_size.value == 0:
392
return None
393
cert = cert_list[0]
394
return ctypes.string_at(cert.data, cert.size)
395
396
397
def fingerprint(openpgp):
398
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
399
# New empty GnuTLS certificate
400
crt = gnutls.library.types.gnutls_openpgp_crt_t()
401
gnutls.library.functions.gnutls_openpgp_crt_init\
402
(ctypes.byref(crt))
403
# New GnuTLS "datum" with the OpenPGP public key
404
datum = gnutls.library.types.gnutls_datum_t\
405
(ctypes.cast(ctypes.c_char_p(openpgp),
406
ctypes.POINTER(ctypes.c_ubyte)),
407
ctypes.c_uint(len(openpgp)))
408
# Import the OpenPGP public key into the certificate
409
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
410
(crt,
411
ctypes.byref(datum),
412
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
413
# New buffer for the fingerprint
414
buffer = ctypes.create_string_buffer(20)
415
buffer_length = ctypes.c_size_t()
416
# Get the fingerprint from the certificate into the buffer
417
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
418
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
419
# Deinit the certificate
420
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
421
# Convert the buffer to a Python bytestring
422
fpr = ctypes.string_at(buffer, buffer_length.value)
423
# Convert the bytestring to hexadecimal notation
424
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
425
return hex_fpr
426
427
428
class tcp_handler(SocketServer.BaseRequestHandler, object):
429
"""A TCP request handler class.
430
Instantiated by IPv6_TCPServer for each request to handle it.
1105
431
Note: This will run in its own forked process."""
1106
432
1107
433
def handle(self):
1108
with contextlib.closing(self.server.child_pipe) as child_pipe:
1109
logger.info(u"TCP connection from: %s",
1110
unicode(self.client_address))
1111
logger.debug(u"Pipe FD: %d",
1112
self.server.child_pipe.fileno())
1113
1114
session = (gnutls.connection
1115
.ClientSession(self.request,
1116
gnutls.connection
1117
.X509Credentials()))
1118
1119
# Note: gnutls.connection.X509Credentials is really a
1120
# generic GnuTLS certificate credentials object so long as
1121
# no X.509 keys are added to it. Therefore, we can use it
1122
# here despite using OpenPGP certificates.
1123
1124
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
1125
# u"+AES-256-CBC", u"+SHA1",
1126
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
1127
# u"+DHE-DSS"))
1128
# Use a fallback default, since this MUST be set.
1129
priority = self.server.gnutls_priority
1130
if priority is None:
1131
priority = u"NORMAL"
1132
(gnutls.library.functions
1133
.gnutls_priority_set_direct(session._c_object,
1134
priority, None))
1135
1136
# Start communication using the Mandos protocol
1137
# Get protocol number
1138
line = self.request.makefile().readline()
1139
logger.debug(u"Protocol version: %r", line)
1140
try:
1141
if int(line.strip().split()[0]) > 1:
1142
raise RuntimeError
1143
except (ValueError, IndexError, RuntimeError), error:
1144
logger.error(u"Unknown protocol version: %s", error)
1145
return
1146
1147
# Start GnuTLS connection
1148
try:
1149
session.handshake()
1150
except gnutls.errors.GNUTLSError, error:
1151
logger.warning(u"Handshake failed: %s", error)
1152
# Do not run session.bye() here: the session is not
1153
# established. Just abandon the request.
1154
return
1155
logger.debug(u"Handshake succeeded")
1156
1157
approval_required = False
1158
try:
1159
try:
1160
fpr = self.fingerprint(self.peer_certificate
1161
(session))
1162
except (TypeError, gnutls.errors.GNUTLSError), error:
1163
logger.warning(u"Bad certificate: %s", error)
1164
return
1165
logger.debug(u"Fingerprint: %s", fpr)
1166
1167
try:
1168
client = ProxyClient(child_pipe, fpr,
1169
self.client_address)
1170
except KeyError:
1171
return
1172
1173
if client.approved_delay:
1174
delay = client.approved_delay
1175
client.approvals_pending += 1
1176
approval_required = True
1177
1178
while True:
1179
if not client.enabled:
1180
logger.warning(u"Client %s is disabled",
1181
client.name)
1182
if self.server.use_dbus:
1183
# Emit D-Bus signal
1184
client.Rejected("Disabled")
1185
return
1186
1187
if client._approved or not client.approved_delay:
1188
#We are approved or approval is disabled
1189
break
1190
elif client._approved is None:
1191
logger.info(u"Client %s need approval",
1192
client.name)
1193
if self.server.use_dbus:
1194
# Emit D-Bus signal
1195
client.NeedApproval(
1196
client.approved_delay_milliseconds(),
1197
client.approved_by_default)
1198
else:
1199
logger.warning(u"Client %s was not approved",
1200
client.name)
1201
if self.server.use_dbus:
1202
# Emit D-Bus signal
1203
client.Rejected("Disapproved")
1204
return
1205
1206
#wait until timeout or approved
1207
#x = float(client._timedelta_to_milliseconds(delay))
1208
time = datetime.datetime.now()
1209
client.changedstate.acquire()
1210
client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))
1211
client.changedstate.release()
1212
time2 = datetime.datetime.now()
1213
if (time2 - time) >= delay:
1214
if not client.approved_by_default:
1215
logger.warning("Client %s timed out while"
1216
" waiting for approval",
1217
client.name)
1218
if self.server.use_dbus:
1219
# Emit D-Bus signal
1220
client.Rejected("Time out")
1221
return
1222
else:
1223
break
1224
else:
1225
delay -= time2 - time
1226
1227
sent_size = 0
1228
while sent_size < len(client.secret):
1229
# XXX handle session exception
1230
sent = session.send(client.secret[sent_size:])
1231
logger.debug(u"Sent: %d, remaining: %d",
1232
sent, len(client.secret)
1233
- (sent_size + sent))
1234
sent_size += sent
1235
1236
logger.info(u"Sending secret to %s", client.name)
1237
# bump the timeout as if seen
1238
client.checked_ok()
1239
if self.server.use_dbus:
1240
# Emit D-Bus signal
1241
client.GotSecret()
1242
1243
finally:
1244
if approval_required:
1245
client.approvals_pending -= 1
1246
session.bye()
1247
1248
@staticmethod
1249
def peer_certificate(session):
1250
"Return the peer's OpenPGP certificate as a bytestring"
1251
# If not an OpenPGP certificate...
1252
if (gnutls.library.functions
1253
.gnutls_certificate_type_get(session._c_object)
1254
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1255
# ...do the normal thing
1256
return session.peer_certificate
1257
list_size = ctypes.c_uint(1)
1258
cert_list = (gnutls.library.functions
1259
.gnutls_certificate_get_peers
1260
(session._c_object, ctypes.byref(list_size)))
1261
if not bool(cert_list) and list_size.value != 0:
1262
raise gnutls.errors.GNUTLSError(u"error getting peer"
1263
u" certificate")
1264
if list_size.value == 0:
1265
return None
1266
cert = cert_list[0]
1267
return ctypes.string_at(cert.data, cert.size)
1268
1269
@staticmethod
1270
def fingerprint(openpgp):
1271
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1272
# New GnuTLS "datum" with the OpenPGP public key
1273
datum = (gnutls.library.types
1274
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1275
ctypes.POINTER
1276
(ctypes.c_ubyte)),
1277
ctypes.c_uint(len(openpgp))))
1278
# New empty GnuTLS certificate
1279
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1280
(gnutls.library.functions
1281
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1282
# Import the OpenPGP public key into the certificate
1283
(gnutls.library.functions
1284
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1285
gnutls.library.constants
1286
.GNUTLS_OPENPGP_FMT_RAW))
1287
# Verify the self signature in the key
1288
crtverify = ctypes.c_uint()
1289
(gnutls.library.functions
1290
.gnutls_openpgp_crt_verify_self(crt, 0,
1291
ctypes.byref(crtverify)))
1292
if crtverify.value != 0:
1293
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1294
raise (gnutls.errors.CertificateSecurityError
1295
(u"Verify failed"))
1296
# New buffer for the fingerprint
1297
buf = ctypes.create_string_buffer(20)
1298
buf_len = ctypes.c_size_t()
1299
# Get the fingerprint from the certificate into the buffer
1300
(gnutls.library.functions
1301
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1302
ctypes.byref(buf_len)))
1303
# Deinit the certificate
1304
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1305
# Convert the buffer to a Python bytestring
1306
fpr = ctypes.string_at(buf, buf_len.value)
1307
# Convert the bytestring to hexadecimal notation
1308
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
1309
return hex_fpr
1310
1311
1312
class MultiprocessingMixIn(object):
1313
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1314
def sub_process_main(self, request, address):
1315
try:
1316
self.finish_request(request, address)
1317
except:
1318
self.handle_error(request, address)
1319
self.close_request(request)
1320
1321
def process_request(self, request, address):
1322
"""Start a new process to process the request."""
1323
multiprocessing.Process(target = self.sub_process_main,
1324
args = (request, address)).start()
1325
1326
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1327
""" adds a pipe to the MixIn """
1328
def process_request(self, request, client_address):
1329
"""Overrides and wraps the original process_request().
1330
1331
This function creates a new pipe in self.pipe
1332
"""
1333
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1334
1335
super(MultiprocessingMixInWithPipe,
1336
self).process_request(request, client_address)
1337
self.add_pipe(parent_pipe)
1338
def add_pipe(self, parent_pipe):
1339
"""Dummy function; override as necessary"""
1340
pass
1341
1342
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1343
socketserver.TCPServer, object):
1344
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
1345
434
logger.debug(u"TCP connection from: %s",
435
unicode(self.client_address))
436
437
line = self.request.makefile().readline()
438
logger.debug(u"Protocol version: %r", line)
439
try:
440
if int(line.strip().split()[0]) > 1:
441
raise RuntimeError
442
except (ValueError, IndexError, RuntimeError), error:
443
logger.error(u"Unknown protocol version: %s", error)
444
return
445
446
session = gnutls.connection.ClientSession\
447
(self.request, gnutls.connection.X509Credentials())
448
# Note: gnutls.connection.X509Credentials is really a generic
449
# GnuTLS certificate credentials object so long as no X.509
450
# keys are added to it. Therefore, we can use it here despite
451
# using OpenPGP certificates.
452
453
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
454
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
455
# "+DHE-DSS"))
456
priority = "NORMAL" # Fallback default, since this
457
# MUST be set.
458
if self.server.settings["priority"]:
459
priority = self.server.settings["priority"]
460
gnutls.library.functions.gnutls_priority_set_direct\
461
(session._c_object, priority, None);
462
463
try:
464
session.handshake()
465
except gnutls.errors.GNUTLSError, error:
466
logger.debug(u"Handshake failed: %s", error)
467
# Do not run session.bye() here: the session is not
468
# established. Just abandon the request.
469
return
470
try:
471
fpr = fingerprint(peer_certificate(session))
472
except (TypeError, gnutls.errors.GNUTLSError), error:
473
logger.debug(u"Bad certificate: %s", error)
474
session.bye()
475
return
476
logger.debug(u"Fingerprint: %s", fpr)
477
client = None
478
for c in self.server.clients:
479
if c.fingerprint == fpr:
480
client = c
481
break
482
if not client:
483
logger.debug(u"Client not found for fingerprint: %s", fpr)
484
session.bye()
485
return
486
# Have to check if client.still_valid(), since it is possible
487
# that the client timed out while establishing the GnuTLS
488
# session.
489
if not client.still_valid():
490
logger.debug(u"Client %(name)s is invalid", vars(client))
491
session.bye()
492
return
493
sent_size = 0
494
while sent_size < len(client.secret):
495
sent = session.send(client.secret[sent_size:])
496
logger.debug(u"Sent: %d, remaining: %d",
497
sent, len(client.secret)
498
- (sent_size + sent))
499
sent_size += sent
500
session.bye()
501
502
503
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
504
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1346
505
Attributes:
1347
enabled: Boolean; whether this server is activated yet
1348
interface: None or a network interface name (string)
1349
use_ipv6: Boolean; to use IPv6 or not
506
settings: Server settings
507
clients: Set() of Client objects
1350
508
"""
1351
def __init__(self, server_address, RequestHandlerClass,
1352
interface=None, use_ipv6=True):
1353
self.interface = interface
1354
if use_ipv6:
1355
self.address_family = socket.AF_INET6
1356
socketserver.TCPServer.__init__(self, server_address,
1357
RequestHandlerClass)
509
address_family = socket.AF_INET6
510
def __init__(self, *args, **kwargs):
511
if "settings" in kwargs:
512
self.settings = kwargs["settings"]
513
del kwargs["settings"]
514
if "clients" in kwargs:
515
self.clients = kwargs["clients"]
516
del kwargs["clients"]
517
return super(type(self), self).__init__(*args, **kwargs)
1358
518
def server_bind(self):
1359
519
"""This overrides the normal server_bind() function
1360
520
to bind to an interface if one was specified, and also NOT to
1361
521
bind to an address or port if they were not specified."""
1362
if self.interface is not None:
1363
if SO_BINDTODEVICE is None:
1364
logger.error(u"SO_BINDTODEVICE does not exist;"
1365
u" cannot bind to interface %s",
1366
self.interface)
1367
else:
1368
try:
1369
self.socket.setsockopt(socket.SOL_SOCKET,
1370
SO_BINDTODEVICE,
1371
str(self.interface
1372
+ u'\0'))
1373
except socket.error, error:
1374
if error[0] == errno.EPERM:
1375
logger.error(u"No permission to"
1376
u" bind to interface %s",
1377
self.interface)
1378
elif error[0] == errno.ENOPROTOOPT:
1379
logger.error(u"SO_BINDTODEVICE not available;"
1380
u" cannot bind to interface %s",
1381
self.interface)
1382
else:
1383
raise
522
if self.settings["interface"]:
523
# 25 is from /usr/include/asm-i486/socket.h
524
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
525
try:
526
self.socket.setsockopt(socket.SOL_SOCKET,
527
SO_BINDTODEVICE,
528
self.settings["interface"])
529
except socket.error, error:
530
if error[0] == errno.EPERM:
531
logger.warning(u"No permission to"
532
u" bind to interface %s",
533
self.settings["interface"])
534
else:
535
raise error
1384
536
# Only bind(2) the socket if we really need to.
1385
537
if self.server_address[0] or self.server_address[1]:
1386
538
if not self.server_address[0]:
1387
if self.address_family == socket.AF_INET6:
1388
any_address = u"::" # in6addr_any
1389
else:
1390
any_address = socket.INADDR_ANY
1391
self.server_address = (any_address,
539
in6addr_any = "::"
540
self.server_address = (in6addr_any,
1392
541
self.server_address[1])
1393
elif not self.server_address[1]:
542
elif self.server_address[1] is None:
1394
543
self.server_address = (self.server_address[0],
1395
544
0)
1396
# if self.interface:
1397
# self.server_address = (self.server_address[0],
1398
# 0, # port
1399
# 0, # flowinfo
1400
# if_nametoindex
1401
# (self.interface))
1402
return socketserver.TCPServer.server_bind(self)
1403
1404
1405
class MandosServer(IPv6_TCPServer):
1406
"""Mandos server.
1407
1408
Attributes:
1409
clients: set of Client objects
1410
gnutls_priority GnuTLS priority string
1411
use_dbus: Boolean; to emit D-Bus signals or not
1412
1413
Assumes a gobject.MainLoop event loop.
1414
"""
1415
def __init__(self, server_address, RequestHandlerClass,
1416
interface=None, use_ipv6=True, clients=None,
1417
gnutls_priority=None, use_dbus=True):
1418
self.enabled = False
1419
self.clients = clients
1420
if self.clients is None:
1421
self.clients = set()
1422
self.use_dbus = use_dbus
1423
self.gnutls_priority = gnutls_priority
1424
IPv6_TCPServer.__init__(self, server_address,
1425
RequestHandlerClass,
1426
interface = interface,
1427
use_ipv6 = use_ipv6)
1428
def server_activate(self):
1429
if self.enabled:
1430
return socketserver.TCPServer.server_activate(self)
1431
def enable(self):
1432
self.enabled = True
1433
def add_pipe(self, parent_pipe):
1434
# Call "handle_ipc" for both data and EOF events
1435
gobject.io_add_watch(parent_pipe.fileno(),
1436
gobject.IO_IN | gobject.IO_HUP,
1437
functools.partial(self.handle_ipc,
1438
parent_pipe = parent_pipe))
1439
1440
def handle_ipc(self, source, condition, parent_pipe=None,
1441
client_object=None):
1442
condition_names = {
1443
gobject.IO_IN: u"IN", # There is data to read.
1444
gobject.IO_OUT: u"OUT", # Data can be written (without
1445
# blocking).
1446
gobject.IO_PRI: u"PRI", # There is urgent data to read.
1447
gobject.IO_ERR: u"ERR", # Error condition.
1448
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
1449
# broken, usually for pipes and
1450
# sockets).
1451
}
1452
conditions_string = ' | '.join(name
1453
for cond, name in
1454
condition_names.iteritems()
1455
if cond & condition)
1456
logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
1457
conditions_string)
1458
1459
# Read a request from the child
1460
request = parent_pipe.recv()
1461
command = request[0]
1462
1463
if command == 'init':
1464
fpr = request[1]
1465
address = request[2]
1466
1467
for c in self.clients:
1468
if c.fingerprint == fpr:
1469
client = c
1470
break
1471
else:
1472
logger.warning(u"Client not found for fingerprint: %s, ad"
1473
u"dress: %s", fpr, address)
1474
if self.use_dbus:
1475
# Emit D-Bus signal
1476
mandos_dbus_service.ClientNotFound(fpr, address)
1477
parent_pipe.send(False)
1478
return False
1479
1480
gobject.io_add_watch(parent_pipe.fileno(),
1481
gobject.IO_IN | gobject.IO_HUP,
1482
functools.partial(self.handle_ipc,
1483
parent_pipe = parent_pipe,
1484
client_object = client))
1485
parent_pipe.send(True)
1486
# remove the old hook in favor of the new above hook on same fileno
1487
return False
1488
if command == 'funcall':
1489
funcname = request[1]
1490
args = request[2]
1491
kwargs = request[3]
1492
1493
parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))
1494
1495
if command == 'getattr':
1496
attrname = request[1]
1497
if callable(client_object.__getattribute__(attrname)):
1498
parent_pipe.send(('function',))
1499
else:
1500
parent_pipe.send(('data', client_object.__getattribute__(attrname)))
1501
1502
if command == 'setattr':
1503
attrname = request[1]
1504
value = request[2]
1505
setattr(client_object, attrname, value)
1506
1507
return True
545
return super(type(self), self).server_bind()
1508
546
1509
547
1510
548
def string_to_delta(interval):
1511
549
"""Parse a string and return a datetime.timedelta
1512
1513
>>> string_to_delta(u'7d')
550
551
>>> string_to_delta('7d')
1514
552
datetime.timedelta(7)
1515
>>> string_to_delta(u'60s')
553
>>> string_to_delta('60s')
1516
554
datetime.timedelta(0, 60)
1517
>>> string_to_delta(u'60m')
555
>>> string_to_delta('60m')
1518
556
datetime.timedelta(0, 3600)
1519
>>> string_to_delta(u'24h')
557
>>> string_to_delta('24h')
1520
558
datetime.timedelta(1)
1521
559
>>> string_to_delta(u'1w')
1522
560
datetime.timedelta(7)
1523
>>> string_to_delta(u'5m 30s')
1524
datetime.timedelta(0, 330)
1525
561
"""
1526
timevalue = datetime.timedelta(0)
1527
for s in interval.split():
1528
try:
1529
suffix = unicode(s[-1])
1530
value = int(s[:-1])
1531
if suffix == u"d":
1532
delta = datetime.timedelta(value)
1533
elif suffix == u"s":
1534
delta = datetime.timedelta(0, value)
1535
elif suffix == u"m":
1536
delta = datetime.timedelta(0, 0, 0, 0, value)
1537
elif suffix == u"h":
1538
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1539
elif suffix == u"w":
1540
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1541
else:
1542
raise ValueError(u"Unknown suffix %r" % suffix)
1543
except (ValueError, IndexError), e:
1544
raise ValueError(e.message)
1545
timevalue += delta
1546
return timevalue
1547
562
try:
563
suffix=unicode(interval[-1])
564
value=int(interval[:-1])
565
if suffix == u"d":
566
delta = datetime.timedelta(value)
567
elif suffix == u"s":
568
delta = datetime.timedelta(0, value)
569
elif suffix == u"m":
570
delta = datetime.timedelta(0, 0, 0, 0, value)
571
elif suffix == u"h":
572
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
573
elif suffix == u"w":
574
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
575
else:
576
raise ValueError
577
except (ValueError, IndexError):
578
raise ValueError
579
return delta
580
581
582
def server_state_changed(state):
583
"""Derived from the Avahi example code"""
584
if state == avahi.SERVER_COLLISION:
585
logger.warning(u"Server name collision")
586
service.remove()
587
elif state == avahi.SERVER_RUNNING:
588
service.add()
589
590
591
def entry_group_state_changed(state, error):
592
"""Derived from the Avahi example code"""
593
logger.debug(u"state change: %i", state)
594
595
if state == avahi.ENTRY_GROUP_ESTABLISHED:
596
logger.debug(u"Service established.")
597
elif state == avahi.ENTRY_GROUP_COLLISION:
598
logger.warning(u"Service name collision.")
599
service.rename()
600
elif state == avahi.ENTRY_GROUP_FAILURE:
601
logger.critical(u"Error in group state changed %s",
602
unicode(error))
603
raise AvahiGroupError("State changed: %s", str(error))
1548
604
1549
605
def if_nametoindex(interface):
1550
"""Call the C function if_nametoindex(), or equivalent
1551
1552
Note: This function cannot accept a unicode string."""
606
"""Call the C function if_nametoindex(), or equivalent"""
1553
607
global if_nametoindex
1554
608
try:
1555
if_nametoindex = (ctypes.cdll.LoadLibrary
1556
(ctypes.util.find_library(u"c"))
1557
.if_nametoindex)
609
if "ctypes.util" not in sys.modules:
610
import ctypes.util
611
if_nametoindex = ctypes.cdll.LoadLibrary\
612
(ctypes.util.find_library("c")).if_nametoindex
1558
613
except (OSError, AttributeError):
1559
logger.warning(u"Doing if_nametoindex the hard way")
614
if "struct" not in sys.modules:
615
import struct
616
if "fcntl" not in sys.modules:
617
import fcntl
1560
618
def if_nametoindex(interface):
1561
619
"Get an interface index the hard way, i.e. using fcntl()"
1562
620
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1563
with contextlib.closing(socket.socket()) as s:
1564
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1565
struct.pack(str(u"16s16x"),
1566
interface))
1567
interface_index = struct.unpack(str(u"I"),
1568
ifreq[16:20])[0]
621
s = socket.socket()
622
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
623
struct.pack("16s16x", interface))
624
s.close()
625
interface_index = struct.unpack("I", ifreq[16:20])[0]
1569
626
return interface_index
1570
627
return if_nametoindex(interface)
1571
628
1572
629
1573
def daemon(nochdir = False, noclose = False):
630
def daemon(nochdir, noclose):
1574
631
"""See daemon(3). Standard BSD Unix function.
1575
1576
632
This should really exist as os.daemon, but it doesn't (yet)."""
1577
633
if os.fork():
1578
634
sys.exit()
1579
635
os.setsid()
1580
636
if not nochdir:
1581
os.chdir(u"/")
1582
if os.fork():
1583
sys.exit()
637
os.chdir("/")
1584
638
if not noclose:
1585
639
# Close all standard open file descriptors
1586
640
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1587
641
if not stat.S_ISCHR(os.fstat(null).st_mode):
1588
642
raise OSError(errno.ENODEV,
1589
u"%s not a character device"
1590
% os.path.devnull)
643
"/dev/null not a character device")
1591
644
os.dup2(null, sys.stdin.fileno())
1592
645
os.dup2(null, sys.stdout.fileno())
1593
646
os.dup2(null, sys.stderr.fileno())
1596
649
1597
650
1598
651
def main():
1599
1600
##################################################################
1601
# Parsing of options, both command line and config file
1602
1603
parser = optparse.OptionParser(version = "%%prog %s" % version)
1604
parser.add_option("-i", u"--interface", type=u"string",
1605
metavar="IF", help=u"Bind to interface IF")
1606
parser.add_option("-a", u"--address", type=u"string",
1607
help=u"Address to listen for requests on")
1608
parser.add_option("-p", u"--port", type=u"int",
1609
help=u"Port number to receive requests on")
1610
parser.add_option("--check", action=u"store_true",
1611
help=u"Run self-test")
1612
parser.add_option("--debug", action=u"store_true",
1613
help=u"Debug mode; run in foreground and log to"
1614
u" terminal")
1615
parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1616
u" priority string (see GnuTLS documentation)")
1617
parser.add_option("--servicename", type=u"string",
1618
metavar=u"NAME", help=u"Zeroconf service name")
1619
parser.add_option("--configdir", type=u"string",
1620
default=u"/etc/mandos", metavar=u"DIR",
1621
help=u"Directory to search for configuration"
1622
u" files")
1623
parser.add_option("--no-dbus", action=u"store_false",
1624
dest=u"use_dbus", help=u"Do not provide D-Bus"
1625
u" system bus interface")
1626
parser.add_option("--no-ipv6", action=u"store_false",
1627
dest=u"use_ipv6", help=u"Do not use IPv6")
1628
options = parser.parse_args()[0]
652
global main_loop_started
653
main_loop_started = False
654
655
parser = OptionParser()
656
parser.add_option("-i", "--interface", type="string",
657
metavar="IF", help="Bind to interface IF")
658
parser.add_option("-a", "--address", type="string",
659
help="Address to listen for requests on")
660
parser.add_option("-p", "--port", type="int",
661
help="Port number to receive requests on")
662
parser.add_option("--check", action="store_true", default=False,
663
help="Run self-test")
664
parser.add_option("--debug", action="store_true", default=False,
665
help="Debug mode; run in foreground and log to"
666
" terminal")
667
parser.add_option("--priority", type="string", help="GnuTLS"
668
" priority string (see GnuTLS documentation)")
669
parser.add_option("--servicename", type="string", metavar="NAME",
670
help="Zeroconf service name")
671
parser.add_option("--configdir", type="string",
672
default="/etc/mandos", metavar="DIR",
673
help="Directory to search for configuration"
674
" files")
675
(options, args) = parser.parse_args()
1629
676
1630
677
if options.check:
1631
678
import doctest
1633
680
sys.exit()
1634
681
1635
682
# Default values for config file for server-global settings
1636
server_defaults = { u"interface": u"",
1637
u"address": u"",
1638
u"port": u"",
1639
u"debug": u"False",
1640
u"priority":
1641
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1642
u"servicename": u"Mandos",
1643
u"use_dbus": u"True",
1644
u"use_ipv6": u"True",
683
server_defaults = { "interface": "",
684
"address": "",
685
"port": "",
686
"debug": "False",
687
"priority":
688
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
689
"servicename": "Mandos",
1645
690
}
1646
691
1647
692
# Parse config file for server-global settings
1648
server_config = configparser.SafeConfigParser(server_defaults)
693
server_config = ConfigParser.SafeConfigParser(server_defaults)
1649
694
del server_defaults
1650
server_config.read(os.path.join(options.configdir,
1651
u"mandos.conf"))
695
server_config.read(os.path.join(options.configdir, "server.conf"))
696
server_section = "server"
1652
697
# Convert the SafeConfigParser object to a dict
1653
server_settings = server_config.defaults()
1654
# Use the appropriate methods on the non-string config options
1655
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1656
server_settings[option] = server_config.getboolean(u"DEFAULT",
1657
option)
1658
if server_settings["port"]:
1659
server_settings["port"] = server_config.getint(u"DEFAULT",
1660
u"port")
698
server_settings = dict(server_config.items(server_section))
699
# Use getboolean on the boolean config option
700
server_settings["debug"] = server_config.getboolean\
701
(server_section, "debug")
1661
702
del server_config
1662
703
1663
704
# Override the settings from the config file with command line
1664
705
# options, if set.
1665
for option in (u"interface", u"address", u"port", u"debug",
1666
u"priority", u"servicename", u"configdir",
1667
u"use_dbus", u"use_ipv6"):
706
for option in ("interface", "address", "port", "debug",
707
"priority", "servicename", "configdir"):
1668
708
value = getattr(options, option)
1669
709
if value is not None:
1670
710
server_settings[option] = value
1671
711
del options
1672
# Force all strings to be unicode
1673
for option in server_settings.keys():
1674
if type(server_settings[option]) is str:
1675
server_settings[option] = unicode(server_settings[option])
1676
712
# Now we have our good server settings in "server_settings"
1677
713
1678
##################################################################
1679
1680
# For convenience
1681
debug = server_settings[u"debug"]
1682
use_dbus = server_settings[u"use_dbus"]
1683
use_ipv6 = server_settings[u"use_ipv6"]
1684
1685
if not debug:
1686
syslogger.setLevel(logging.WARNING)
1687
console.setLevel(logging.WARNING)
1688
1689
if server_settings[u"servicename"] != u"Mandos":
1690
syslogger.setFormatter(logging.Formatter
1691
(u'Mandos (%s) [%%(process)d]:'
1692
u' %%(levelname)s: %%(message)s'
1693
% server_settings[u"servicename"]))
1694
1695
714
# Parse config file with clients
1696
client_defaults = { u"timeout": u"1h",
1697
u"interval": u"5m",
1698
u"checker": u"fping -q -- %%(host)s",
1699
u"host": u"",
1700
u"approved_delay": u"0s",
1701
u"approved_duration": u"1s",
715
client_defaults = { "timeout": "1h",
716
"interval": "5m",
717
"checker": "fping -q -- %%(fqdn)s",
1702
718
}
1703
client_config = configparser.SafeConfigParser(client_defaults)
1704
client_config.read(os.path.join(server_settings[u"configdir"],
1705
u"clients.conf"))
1706
1707
global mandos_dbus_service
1708
mandos_dbus_service = None
1709
1710
tcp_server = MandosServer((server_settings[u"address"],
1711
server_settings[u"port"]),
1712
ClientHandler,
1713
interface=server_settings[u"interface"],
1714
use_ipv6=use_ipv6,
1715
gnutls_priority=
1716
server_settings[u"priority"],
1717
use_dbus=use_dbus)
1718
pidfilename = u"/var/run/mandos.pid"
1719
try:
1720
pidfile = open(pidfilename, u"w")
1721
except IOError:
1722
logger.error(u"Could not open file %r", pidfilename)
1723
1724
try:
1725
uid = pwd.getpwnam(u"_mandos").pw_uid
1726
gid = pwd.getpwnam(u"_mandos").pw_gid
1727
except KeyError:
1728
try:
1729
uid = pwd.getpwnam(u"mandos").pw_uid
1730
gid = pwd.getpwnam(u"mandos").pw_gid
1731
except KeyError:
1732
try:
1733
uid = pwd.getpwnam(u"nobody").pw_uid
1734
gid = pwd.getpwnam(u"nobody").pw_gid
1735
except KeyError:
1736
uid = 65534
1737
gid = 65534
1738
try:
1739
os.setgid(gid)
1740
os.setuid(uid)
1741
except OSError, error:
1742
if error[0] != errno.EPERM:
1743
raise error
1744
1745
# Enable all possible GnuTLS debugging
1746
if debug:
1747
# "Use a log level over 10 to enable all debugging options."
1748
# - GnuTLS manual
1749
gnutls.library.functions.gnutls_global_set_log_level(11)
1750
1751
@gnutls.library.types.gnutls_log_func
1752
def debug_gnutls(level, string):
1753
logger.debug(u"GnuTLS: %s", string[:-1])
1754
1755
(gnutls.library.functions
1756
.gnutls_global_set_log_function(debug_gnutls))
719
client_config = ConfigParser.SafeConfigParser(client_defaults)
720
client_config.read(os.path.join(server_settings["configdir"],
721
"clients.conf"))
722
723
global service
724
service = AvahiService(name = server_settings["servicename"],
725
type = "_mandos._tcp", );
726
if server_settings["interface"]:
727
service.interface = if_nametoindex(server_settings["interface"])
1757
728
1758
729
global main_loop
730
global bus
731
global server
1759
732
# From the Avahi example code
1760
733
DBusGMainLoop(set_as_default=True )
1761
734
main_loop = gobject.MainLoop()
1762
735
bus = dbus.SystemBus()
736
server = dbus.Interface(
737
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
738
avahi.DBUS_INTERFACE_SERVER )
1763
739
# End of Avahi example code
1764
if use_dbus:
1765
try:
1766
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos",
1767
bus, do_not_queue=True)
1768
except dbus.exceptions.NameExistsException, e:
1769
logger.error(unicode(e) + u", disabling D-Bus")
1770
use_dbus = False
1771
server_settings[u"use_dbus"] = False
1772
tcp_server.use_dbus = False
1773
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1774
service = AvahiService(name = server_settings[u"servicename"],
1775
servicetype = u"_mandos._tcp",
1776
protocol = protocol, bus = bus)
1777
if server_settings["interface"]:
1778
service.interface = (if_nametoindex
1779
(str(server_settings[u"interface"])))
1780
1781
client_class = Client
1782
if use_dbus:
1783
client_class = functools.partial(ClientDBus, bus = bus)
1784
def client_config_items(config, section):
1785
special_settings = {
1786
"approved_by_default":
1787
lambda: config.getboolean(section,
1788
"approved_by_default"),
1789
}
1790
for name, value in config.items(section):
1791
try:
1792
yield (name, special_settings[name]())
1793
except KeyError:
1794
yield (name, value)
1795
1796
tcp_server.clients.update(set(
1797
client_class(name = section,
1798
config= dict(client_config_items(
1799
client_config, section)))
1800
for section in client_config.sections()))
1801
if not tcp_server.clients:
1802
logger.warning(u"No clients defined")
740
741
debug = server_settings["debug"]
1803
742
1804
743
if debug:
1805
# Redirect stdin so all checkers get /dev/null
1806
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1807
os.dup2(null, sys.stdin.fileno())
1808
if null > 2:
1809
os.close(null)
1810
else:
1811
# No console logging
1812
logger.removeHandler(console)
1813
# Close all input and output, do double fork, etc.
1814
daemon()
1815
1816
try:
1817
with pidfile:
1818
pid = os.getpid()
1819
pidfile.write(str(pid) + "\n")
1820
del pidfile
1821
except IOError:
1822
logger.error(u"Could not write to file %r with PID %d",
1823
pidfilename, pid)
1824
except NameError:
1825
# "pidfile" was never created
1826
pass
1827
del pidfilename
744
console = logging.StreamHandler()
745
# console.setLevel(logging.DEBUG)
746
console.setFormatter(logging.Formatter\
747
('%(levelname)s: %(message)s'))
748
logger.addHandler(console)
749
del console
750
751
clients = Set()
752
def remove_from_clients(client):
753
clients.remove(client)
754
if not clients:
755
logger.debug(u"No clients left, exiting")
756
sys.exit()
757
758
clients.update(Set(Client(name=section,
759
stop_hook = remove_from_clients,
760
**(dict(client_config\
761
.items(section))))
762
for section in client_config.sections()))
763
764
if not debug:
765
daemon(False, False)
766
767
def cleanup():
768
"Cleanup function; run on exit"
769
global group
770
# From the Avahi example code
771
if not group is None:
772
group.Free()
773
group = None
774
# End of Avahi example code
775
776
while clients:
777
client = clients.pop()
778
client.stop_hook = None
779
client.stop()
780
781
atexit.register(cleanup)
1828
782
1829
783
if not debug:
1830
784
signal.signal(signal.SIGINT, signal.SIG_IGN)
1831
785
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1832
786
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1833
787
1834
if use_dbus:
1835
class MandosDBusService(dbus.service.Object):
1836
"""A D-Bus proxy object"""
1837
def __init__(self):
1838
dbus.service.Object.__init__(self, bus, u"/")
1839
_interface = u"se.bsnet.fukt.Mandos"
1840
1841
@dbus.service.signal(_interface, signature=u"o")
1842
def ClientAdded(self, objpath):
1843
"D-Bus signal"
1844
pass
1845
1846
@dbus.service.signal(_interface, signature=u"ss")
1847
def ClientNotFound(self, fingerprint, address):
1848
"D-Bus signal"
1849
pass
1850
1851
@dbus.service.signal(_interface, signature=u"os")
1852
def ClientRemoved(self, objpath, name):
1853
"D-Bus signal"
1854
pass
1855
1856
@dbus.service.method(_interface, out_signature=u"ao")
1857
def GetAllClients(self):
1858
"D-Bus method"
1859
return dbus.Array(c.dbus_object_path
1860
for c in tcp_server.clients)
1861
1862
@dbus.service.method(_interface,
1863
out_signature=u"a{oa{sv}}")
1864
def GetAllClientsWithProperties(self):
1865
"D-Bus method"
1866
return dbus.Dictionary(
1867
((c.dbus_object_path, c.GetAll(u""))
1868
for c in tcp_server.clients),
1869
signature=u"oa{sv}")
1870
1871
@dbus.service.method(_interface, in_signature=u"o")
1872
def RemoveClient(self, object_path):
1873
"D-Bus method"
1874
for c in tcp_server.clients:
1875
if c.dbus_object_path == object_path:
1876
tcp_server.clients.remove(c)
1877
c.remove_from_connection()
1878
# Don't signal anything except ClientRemoved
1879
c.disable(quiet=True)
1880
# Emit D-Bus signal
1881
self.ClientRemoved(object_path, c.name)
1882
return
1883
raise KeyError(object_path)
1884
1885
del _interface
1886
1887
mandos_dbus_service = MandosDBusService()
1888
1889
def cleanup():
1890
"Cleanup function; run on exit"
1891
service.cleanup()
1892
1893
while tcp_server.clients:
1894
client = tcp_server.clients.pop()
1895
if use_dbus:
1896
client.remove_from_connection()
1897
client.disable_hook = None
1898
# Don't signal anything except ClientRemoved
1899
client.disable(quiet=True)
1900
if use_dbus:
1901
# Emit D-Bus signal
1902
mandos_dbus_service.ClientRemoved(client.dbus_object_path,
1903
client.name)
1904
1905
atexit.register(cleanup)
1906
1907
for client in tcp_server.clients:
1908
if use_dbus:
1909
# Emit D-Bus signal
1910
mandos_dbus_service.ClientAdded(client.dbus_object_path)
1911
client.enable()
1912
1913
tcp_server.enable()
1914
tcp_server.server_activate()
1915
788
for client in clients:
789
client.start()
790
791
tcp_server = IPv6_TCPServer((server_settings["address"],
792
server_settings["port"]),
793
tcp_handler,
794
settings=server_settings,
795
clients=clients)
1916
796
# Find out what port we got
1917
797
service.port = tcp_server.socket.getsockname()[1]
1918
if use_ipv6:
1919
logger.info(u"Now listening on address %r, port %d,"
1920
" flowinfo %d, scope_id %d"
1921
% tcp_server.socket.getsockname())
1922
else: # IPv4
1923
logger.info(u"Now listening on address %r, port %d"
1924
% tcp_server.socket.getsockname())
798
logger.debug(u"Now listening on address %r, port %d, flowinfo %d,"
799
u" scope_id %d" % tcp_server.socket.getsockname())
1925
800
1926
801
#service.interface = tcp_server.socket.getsockname()[3]
1927
802
1928
803
try:
1929
804
# From the Avahi example code
805
server.connect_to_signal("StateChanged", server_state_changed)
1930
806
try:
1931
service.activate()
807
server_state_changed(server.GetState())
1932
808
except dbus.exceptions.DBusException, error:
1933
809
logger.critical(u"DBusException: %s", error)
1934
cleanup()
1935
810
sys.exit(1)
1936
811
# End of Avahi example code
1937
812
1938
813
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1939
814
lambda *args, **kwargs:
1940
(tcp_server.handle_request
1941
(*args[2:], **kwargs) or True))
815
tcp_server.handle_request\
816
(*args[2:], **kwargs) or True)
1942
817
1943
logger.debug(u"Starting main loop")
818
logger.debug("Starting main loop")
819
main_loop_started = True
1944
820
main_loop.run()
1945
821
except AvahiError, error:
1946
logger.critical(u"AvahiError: %s", error)
1947
cleanup()
822
logger.critical(u"AvahiError: %s" + unicode(error))
1948
823
sys.exit(1)
1949
824
except KeyboardInterrupt:
1950
825
if debug:
1951
print >> sys.stderr
1952
logger.debug(u"Server received KeyboardInterrupt")
1953
logger.debug(u"Server exiting")
1954
# Must run before the D-Bus bus name gets deregistered
1955
cleanup()
826
print
1956
827
1957
828
if __name__ == '__main__':
1958
829
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0