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- Committer: Teddy Hogeborn
- Date: 2008-08-04 23:38:26 UTC
- mfrom: (24.1.20 mandos)
- Revision ID: teddy@fukt.bsnet.se-20080804233826-idy7v8x36llseue0
* network-protocol.txt: New.
* server.py (daemon): Do the double fork thing.
* server.py (daemon): Do the double fork thing.
- files added:
- network-protocol.txt
- 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
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# and some lines 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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31
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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
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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 stat
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import logging
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import logging.handlers
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import pwd
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from contextlib import closing
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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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import ctypes
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import ctypes.util
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63
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version = "1.0.5"
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64
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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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address = "/dev/log"))
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syslogger.setFormatter(logging.Formatter
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('Mandos: %(levelname)s: %(message)s'))
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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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del syslogger
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console = logging.StreamHandler()
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console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
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' %(message)s'))
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logger.addHandler(console)
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73
84
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class AvahiError(Exception):
85
def __init__(self, value, *args, **kwargs):
75
def __init__(self, value):
86
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self.value = value
87
super(AvahiError, self).__init__(value, *args, **kwargs)
88
def __unicode__(self):
89
return unicode(repr(self.value))
77
def __str__(self):
78
return repr(self.value)
90
79
91
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class AvahiServiceError(AvahiError):
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81
pass
112
101
a sensible number of times
113
102
"""
114
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def __init__(self, interface = avahi.IF_UNSPEC, name = None,
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servicetype = None, port = None, TXT = None,
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domain = "", host = "", max_renames = 32768):
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type = None, port = None, TXT = None, domain = "",
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host = "", max_renames = 12):
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self.interface = interface
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self.name = name
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self.type = servicetype
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self.type = type
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self.port = port
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self.TXT = TXT if TXT is not None else []
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if TXT is None:
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self.TXT = []
112
else:
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self.TXT = TXT
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self.domain = domain
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self.host = host
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self.rename_count = 0
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self.max_renames = max_renames
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def rename(self):
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"""Derived from the Avahi example code"""
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if self.rename_count >= self.max_renames:
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logger.critical(u"No suitable Zeroconf service name found"
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u" after %i retries, exiting.",
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self.rename_count)
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raise AvahiServiceError(u"Too many renames")
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self.name = server.GetAlternativeServiceName(self.name)
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logger.info(u"Changing Zeroconf service name to %r ...",
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str(self.name))
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syslogger.setFormatter(logging.Formatter
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('Mandos (%s): %%(levelname)s:'
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' %%(message)s' % 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)
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raise AvahiServiceError("Too many renames")
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name = server.GetAlternativeServiceName(name)
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logger.error(u"Changing name to %r ...", name)
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self.remove()
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self.add()
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self.rename_count += 1
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"""Derived from the Avahi example code"""
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global group
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if group is None:
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group = dbus.Interface(bus.get_object
151
(avahi.DBUS_NAME,
136
group = dbus.Interface\
137
(bus.get_object(avahi.DBUS_NAME,
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138
server.EntryGroupNew()),
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avahi.DBUS_INTERFACE_ENTRY_GROUP)
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avahi.DBUS_INTERFACE_ENTRY_GROUP)
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group.connect_to_signal('StateChanged',
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141
entry_group_state_changed)
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logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
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logger.debug(u"Adding service '%s' of type '%s' ...",
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service.name, service.type)
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group.AddService(
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self.interface, # interface
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# End of Avahi example code
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def _datetime_to_dbus(dt, variant_level=0):
174
"""Convert a UTC datetime.datetime() to a D-Bus type."""
175
return dbus.String(dt.isoformat(), variant_level=variant_level)
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class Client(dbus.service.Object):
159
class Client(object):
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"""A representation of a client host served by this server.
180
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Attributes:
181
name: string; from the config file, used in log messages and
182
D-Bus identifiers
162
name: string; from the config file, used in log messages
183
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fingerprint: string (40 or 32 hexadecimal digits); used to
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uniquely identify the client
185
secret: bytestring; sent verbatim (over TLS) to client
186
host: string; available for use by the checker command
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created: datetime.datetime(); (UTC) object creation
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last_enabled: datetime.datetime(); (UTC)
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enabled: bool()
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last_checked_ok: datetime.datetime(); (UTC) or None
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timeout: datetime.timedelta(); How long from last_checked_ok
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until this client is invalid
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interval: datetime.timedelta(); How often to start a new checker
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disable_hook: If set, called by disable() as disable_hook(self)
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checker: subprocess.Popen(); a running checker process used
196
to see if the client lives.
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'None' if no process is running.
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secret: bytestring; sent verbatim (over TLS) to client
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fqdn: string (FQDN); available for use by the checker command
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created: datetime.datetime(); object creation, not client host
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last_checked_ok: datetime.datetime() or None if not yet checked OK
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timeout: datetime.timedelta(); How long from last_checked_ok
170
until this client is invalid
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interval: datetime.timedelta(); How often to start a new checker
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stop_hook: If set, called by stop() as stop_hook(self)
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checker: subprocess.Popen(); a running checker process used
174
to see if the client lives.
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'None' if no process is running.
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checker_initiator_tag: a gobject event source tag, or None
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disable_initiator_tag: - '' -
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stop_initiator_tag: - '' -
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checker_callback_tag: - '' -
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checker_command: string; External command which is run to check if
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client lives. %() expansions are done at
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runtime with vars(self) as dict, so that for
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instance %(name)s can be used in the command.
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use_dbus: bool(); Whether to provide D-Bus interface and signals
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dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
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Private attibutes:
184
_timeout: Real variable for 'timeout'
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_interval: Real variable for 'interval'
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_timeout_milliseconds: Used when calling gobject.timeout_add()
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_interval_milliseconds: - '' -
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"""
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def timeout_milliseconds(self):
209
"Return the 'timeout' attribute in milliseconds"
210
return ((self.timeout.days * 24 * 60 * 60 * 1000)
211
+ (self.timeout.seconds * 1000)
212
+ (self.timeout.microseconds // 1000))
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def interval_milliseconds(self):
215
"Return the 'interval' attribute in milliseconds"
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return ((self.interval.days * 24 * 60 * 60 * 1000)
217
+ (self.interval.seconds * 1000)
218
+ (self.interval.microseconds // 1000))
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def __init__(self, name = None, disable_hook=None, config=None,
221
use_dbus=True):
189
def _set_timeout(self, timeout):
190
"Setter function for 'timeout' attribute"
191
self._timeout = timeout
192
self._timeout_milliseconds = ((self.timeout.days
193
* 24 * 60 * 60 * 1000)
194
+ (self.timeout.seconds * 1000)
195
+ (self.timeout.microseconds
196
// 1000))
197
timeout = property(lambda self: self._timeout,
198
_set_timeout)
199
del _set_timeout
200
def _set_interval(self, interval):
201
"Setter function for 'interval' attribute"
202
self._interval = interval
203
self._interval_milliseconds = ((self.interval.days
204
* 24 * 60 * 60 * 1000)
205
+ (self.interval.seconds
206
* 1000)
207
+ (self.interval.microseconds
208
// 1000))
209
interval = property(lambda self: self._interval,
210
_set_interval)
211
del _set_interval
212
def __init__(self, name = None, stop_hook=None, config={}):
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"""Note: the 'checker' key in 'config' sets the
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'checker_command' attribute and *not* the 'checker'
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attribute."""
225
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self.name = name
226
if config is None:
227
config = {}
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logger.debug(u"Creating client %r", self.name)
229
self.use_dbus = False # During __init__
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# Uppercase and remove spaces from fingerprint for later
231
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# comparison purposes with return value from the fingerprint()
232
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# function
233
self.fingerprint = (config["fingerprint"].upper()
234
.replace(u" ", u""))
221
self.fingerprint = config["fingerprint"].upper()\
222
.replace(u" ", u"")
235
223
logger.debug(u" Fingerprint: %s", self.fingerprint)
236
224
if "secret" in config:
237
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self.secret = config["secret"].decode(u"base64")
238
226
elif "secfile" in config:
239
with closing(open(os.path.expanduser
240
(os.path.expandvars
241
(config["secfile"])))) as secfile:
242
self.secret = secfile.read()
227
sf = open(config["secfile"])
228
self.secret = sf.read()
229
sf.close()
243
230
else:
244
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raise TypeError(u"No secret or secfile for client %s"
245
232
% self.name)
246
self.host = config.get("host", "")
247
self.created = datetime.datetime.utcnow()
248
self.enabled = False
249
self.last_enabled = None
233
self.fqdn = config.get("fqdn", "")
234
self.created = datetime.datetime.now()
250
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self.last_checked_ok = None
251
236
self.timeout = string_to_delta(config["timeout"])
252
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self.interval = string_to_delta(config["interval"])
253
self.disable_hook = disable_hook
238
self.stop_hook = stop_hook
254
239
self.checker = None
255
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self.checker_initiator_tag = None
256
self.disable_initiator_tag = None
241
self.stop_initiator_tag = None
257
242
self.checker_callback_tag = None
258
self.checker_command = config["checker"]
259
self.last_connect = None
260
# Only now, when this client is initialized, can it show up on
261
# the D-Bus
262
self.use_dbus = use_dbus
263
if self.use_dbus:
264
self.dbus_object_path = (dbus.ObjectPath
265
("/clients/"
266
+ self.name.replace(".", "_")))
267
dbus.service.Object.__init__(self, bus,
268
self.dbus_object_path)
269
270
def enable(self):
243
self.check_command = config["checker"]
244
def start(self):
271
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"""Start this client's checker and timeout hooks"""
272
self.last_enabled = datetime.datetime.utcnow()
273
246
# Schedule a new checker to be started an 'interval' from now,
274
247
# and every interval from then on.
275
self.checker_initiator_tag = (gobject.timeout_add
276
(self.interval_milliseconds(),
277
self.start_checker))
248
self.checker_initiator_tag = gobject.timeout_add\
249
(self._interval_milliseconds,
250
self.start_checker)
278
251
# Also start a new checker *right now*.
279
252
self.start_checker()
280
# Schedule a disable() when 'timeout' has passed
281
self.disable_initiator_tag = (gobject.timeout_add
282
(self.timeout_milliseconds(),
283
self.disable))
284
self.enabled = True
285
if self.use_dbus:
286
# Emit D-Bus signals
287
self.PropertyChanged(dbus.String(u"enabled"),
288
dbus.Boolean(True, variant_level=1))
289
self.PropertyChanged(dbus.String(u"last_enabled"),
290
(_datetime_to_dbus(self.last_enabled,
291
variant_level=1)))
292
293
def disable(self):
294
"""Disable this client."""
295
if not getattr(self, "enabled", False):
253
# Schedule a stop() when 'timeout' has passed
254
self.stop_initiator_tag = gobject.timeout_add\
255
(self._timeout_milliseconds,
256
self.stop)
257
def stop(self):
258
"""Stop this client.
259
The possibility that a client might be restarted is left open,
260
but not currently used."""
261
# If this client doesn't have a secret, it is already stopped.
262
if self.secret:
263
logger.info(u"Stopping client %s", self.name)
264
self.secret = None
265
else:
296
266
return False
297
logger.info(u"Disabling client %s", self.name)
298
if getattr(self, "disable_initiator_tag", False):
299
gobject.source_remove(self.disable_initiator_tag)
300
self.disable_initiator_tag = None
267
if getattr(self, "stop_initiator_tag", False):
268
gobject.source_remove(self.stop_initiator_tag)
269
self.stop_initiator_tag = None
301
270
if getattr(self, "checker_initiator_tag", False):
302
271
gobject.source_remove(self.checker_initiator_tag)
303
272
self.checker_initiator_tag = None
304
273
self.stop_checker()
305
if self.disable_hook:
306
self.disable_hook(self)
307
self.enabled = False
308
if self.use_dbus:
309
# Emit D-Bus signal
310
self.PropertyChanged(dbus.String(u"enabled"),
311
dbus.Boolean(False, variant_level=1))
274
if self.stop_hook:
275
self.stop_hook(self)
312
276
# Do not run this again if called by a gobject.timeout_add
313
277
return False
314
315
278
def __del__(self):
316
self.disable_hook = None
317
self.disable()
318
319
def checker_callback(self, pid, condition, command):
279
self.stop_hook = None
280
self.stop()
281
def checker_callback(self, pid, condition):
320
282
"""The checker has completed, so take appropriate actions."""
283
now = datetime.datetime.now()
321
284
self.checker_callback_tag = None
322
285
self.checker = None
323
if self.use_dbus:
324
# Emit D-Bus signal
325
self.PropertyChanged(dbus.String(u"checker_running"),
326
dbus.Boolean(False, variant_level=1))
327
if os.WIFEXITED(condition):
328
exitstatus = os.WEXITSTATUS(condition)
329
if exitstatus == 0:
330
logger.info(u"Checker for %(name)s succeeded",
331
vars(self))
332
self.checked_ok()
333
else:
334
logger.info(u"Checker for %(name)s failed",
335
vars(self))
336
if self.use_dbus:
337
# Emit D-Bus signal
338
self.CheckerCompleted(dbus.Int16(exitstatus),
339
dbus.Int64(condition),
340
dbus.String(command))
341
else:
286
if os.WIFEXITED(condition) \
287
and (os.WEXITSTATUS(condition) == 0):
288
logger.info(u"Checker for %(name)s succeeded",
289
vars(self))
290
self.last_checked_ok = now
291
gobject.source_remove(self.stop_initiator_tag)
292
self.stop_initiator_tag = gobject.timeout_add\
293
(self._timeout_milliseconds,
294
self.stop)
295
elif not os.WIFEXITED(condition):
342
296
logger.warning(u"Checker for %(name)s crashed?",
343
297
vars(self))
344
if self.use_dbus:
345
# Emit D-Bus signal
346
self.CheckerCompleted(dbus.Int16(-1),
347
dbus.Int64(condition),
348
dbus.String(command))
349
350
def checked_ok(self):
351
"""Bump up the timeout for this client.
352
This should only be called when the client has been seen,
353
alive and well.
354
"""
355
self.last_checked_ok = datetime.datetime.utcnow()
356
gobject.source_remove(self.disable_initiator_tag)
357
self.disable_initiator_tag = (gobject.timeout_add
358
(self.timeout_milliseconds(),
359
self.disable))
360
if self.use_dbus:
361
# Emit D-Bus signal
362
self.PropertyChanged(
363
dbus.String(u"last_checked_ok"),
364
(_datetime_to_dbus(self.last_checked_ok,
365
variant_level=1)))
366
298
else:
299
logger.info(u"Checker for %(name)s failed",
300
vars(self))
367
301
def start_checker(self):
368
302
"""Start a new checker subprocess if one is not running.
369
303
If a checker already exists, leave it running and do
378
312
# is as it should be.
379
313
if self.checker is None:
380
314
try:
381
# In case checker_command has exactly one % operator
382
command = self.checker_command % self.host
315
# In case check_command has exactly one % operator
316
command = self.check_command % self.fqdn
383
317
except TypeError:
384
318
# Escape attributes for the shell
385
319
escaped_attrs = dict((key, re.escape(str(val)))
386
320
for key, val in
387
321
vars(self).iteritems())
388
322
try:
389
command = self.checker_command % escaped_attrs
323
command = self.check_command % escaped_attrs
390
324
except TypeError, error:
391
325
logger.error(u'Could not format string "%s":'
392
u' %s', self.checker_command, error)
326
u' %s', self.check_command, error)
393
327
return True # Try again later
394
328
try:
395
329
logger.info(u"Starting checker %r for %s",
396
330
command, self.name)
397
# We don't need to redirect stdout and stderr, since
398
# in normal mode, that is already done by daemon(),
399
# and in debug mode we don't want to. (Stdin is
400
# always replaced by /dev/null.)
401
331
self.checker = subprocess.Popen(command,
402
332
close_fds=True,
403
333
shell=True, cwd="/")
404
if self.use_dbus:
405
# Emit D-Bus signal
406
self.CheckerStarted(command)
407
self.PropertyChanged(
408
dbus.String("checker_running"),
409
dbus.Boolean(True, variant_level=1))
410
self.checker_callback_tag = (gobject.child_watch_add
411
(self.checker.pid,
412
self.checker_callback,
413
data=command))
414
except OSError, error:
334
self.checker_callback_tag = gobject.child_watch_add\
335
(self.checker.pid,
336
self.checker_callback)
337
except subprocess.OSError, error:
415
338
logger.error(u"Failed to start subprocess: %s",
416
339
error)
417
340
# Re-run this periodically if run by gobject.timeout_add
418
341
return True
419
420
342
def stop_checker(self):
421
343
"""Force the checker process, if any, to stop."""
422
344
if self.checker_callback_tag:
424
346
self.checker_callback_tag = None
425
347
if getattr(self, "checker", None) is None:
426
348
return
427
logger.debug(u"Stopping checker for %(name)s", vars(self))
349
logger.debug("Stopping checker for %(name)s", vars(self))
428
350
try:
429
351
os.kill(self.checker.pid, signal.SIGTERM)
430
352
#os.sleep(0.5)
434
356
if error.errno != errno.ESRCH: # No such process
435
357
raise
436
358
self.checker = None
437
if self.use_dbus:
438
self.PropertyChanged(dbus.String(u"checker_running"),
439
dbus.Boolean(False, variant_level=1))
440
441
359
def still_valid(self):
442
360
"""Has the timeout not yet passed for this client?"""
443
if not getattr(self, "enabled", False):
444
return False
445
now = datetime.datetime.utcnow()
361
now = datetime.datetime.now()
446
362
if self.last_checked_ok is None:
447
363
return now < (self.created + self.timeout)
448
364
else:
449
365
return now < (self.last_checked_ok + self.timeout)
450
451
## D-Bus methods & signals
452
_interface = u"se.bsnet.fukt.Mandos.Client"
453
454
# CheckedOK - method
455
CheckedOK = dbus.service.method(_interface)(checked_ok)
456
CheckedOK.__name__ = "CheckedOK"
457
458
# CheckerCompleted - signal
459
@dbus.service.signal(_interface, signature="nxs")
460
def CheckerCompleted(self, exitcode, waitstatus, command):
461
"D-Bus signal"
462
pass
463
464
# CheckerStarted - signal
465
@dbus.service.signal(_interface, signature="s")
466
def CheckerStarted(self, command):
467
"D-Bus signal"
468
pass
469
470
# GetAllProperties - method
471
@dbus.service.method(_interface, out_signature="a{sv}")
472
def GetAllProperties(self):
473
"D-Bus method"
474
return dbus.Dictionary({
475
dbus.String("name"):
476
dbus.String(self.name, variant_level=1),
477
dbus.String("fingerprint"):
478
dbus.String(self.fingerprint, variant_level=1),
479
dbus.String("host"):
480
dbus.String(self.host, variant_level=1),
481
dbus.String("created"):
482
_datetime_to_dbus(self.created, variant_level=1),
483
dbus.String("last_enabled"):
484
(_datetime_to_dbus(self.last_enabled,
485
variant_level=1)
486
if self.last_enabled is not None
487
else dbus.Boolean(False, variant_level=1)),
488
dbus.String("enabled"):
489
dbus.Boolean(self.enabled, variant_level=1),
490
dbus.String("last_checked_ok"):
491
(_datetime_to_dbus(self.last_checked_ok,
492
variant_level=1)
493
if self.last_checked_ok is not None
494
else dbus.Boolean (False, variant_level=1)),
495
dbus.String("timeout"):
496
dbus.UInt64(self.timeout_milliseconds(),
497
variant_level=1),
498
dbus.String("interval"):
499
dbus.UInt64(self.interval_milliseconds(),
500
variant_level=1),
501
dbus.String("checker"):
502
dbus.String(self.checker_command,
503
variant_level=1),
504
dbus.String("checker_running"):
505
dbus.Boolean(self.checker is not None,
506
variant_level=1),
507
dbus.String("object_path"):
508
dbus.ObjectPath(self.dbus_object_path,
509
variant_level=1)
510
}, signature="sv")
511
512
# IsStillValid - method
513
IsStillValid = (dbus.service.method(_interface, out_signature="b")
514
(still_valid))
515
IsStillValid.__name__ = "IsStillValid"
516
517
# PropertyChanged - signal
518
@dbus.service.signal(_interface, signature="sv")
519
def PropertyChanged(self, property, value):
520
"D-Bus signal"
521
pass
522
523
# SetChecker - method
524
@dbus.service.method(_interface, in_signature="s")
525
def SetChecker(self, checker):
526
"D-Bus setter method"
527
self.checker_command = checker
528
# Emit D-Bus signal
529
self.PropertyChanged(dbus.String(u"checker"),
530
dbus.String(self.checker_command,
531
variant_level=1))
532
533
# SetHost - method
534
@dbus.service.method(_interface, in_signature="s")
535
def SetHost(self, host):
536
"D-Bus setter method"
537
self.host = host
538
# Emit D-Bus signal
539
self.PropertyChanged(dbus.String(u"host"),
540
dbus.String(self.host, variant_level=1))
541
542
# SetInterval - method
543
@dbus.service.method(_interface, in_signature="t")
544
def SetInterval(self, milliseconds):
545
self.interval = datetime.timedelta(0, 0, 0, milliseconds)
546
# Emit D-Bus signal
547
self.PropertyChanged(dbus.String(u"interval"),
548
(dbus.UInt64(self.interval_milliseconds(),
549
variant_level=1)))
550
551
# SetSecret - method
552
@dbus.service.method(_interface, in_signature="ay",
553
byte_arrays=True)
554
def SetSecret(self, secret):
555
"D-Bus setter method"
556
self.secret = str(secret)
557
558
# SetTimeout - method
559
@dbus.service.method(_interface, in_signature="t")
560
def SetTimeout(self, milliseconds):
561
self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
562
# Emit D-Bus signal
563
self.PropertyChanged(dbus.String(u"timeout"),
564
(dbus.UInt64(self.timeout_milliseconds(),
565
variant_level=1)))
566
567
# Enable - method
568
Enable = dbus.service.method(_interface)(enable)
569
Enable.__name__ = "Enable"
570
571
# StartChecker - method
572
@dbus.service.method(_interface)
573
def StartChecker(self):
574
"D-Bus method"
575
self.start_checker()
576
577
# Disable - method
578
@dbus.service.method(_interface)
579
def Disable(self):
580
"D-Bus method"
581
self.disable()
582
583
# StopChecker - method
584
StopChecker = dbus.service.method(_interface)(stop_checker)
585
StopChecker.__name__ = "StopChecker"
586
587
del _interface
588
366
589
367
590
368
def peer_certificate(session):
591
369
"Return the peer's OpenPGP certificate as a bytestring"
592
370
# If not an OpenPGP certificate...
593
if (gnutls.library.functions
594
.gnutls_certificate_type_get(session._c_object)
595
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
371
if gnutls.library.functions.gnutls_certificate_type_get\
372
(session._c_object) \
373
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
596
374
# ...do the normal thing
597
375
return session.peer_certificate
598
376
list_size = ctypes.c_uint()
599
cert_list = (gnutls.library.functions
600
.gnutls_certificate_get_peers
601
(session._c_object, ctypes.byref(list_size)))
377
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
378
(session._c_object, ctypes.byref(list_size))
602
379
if list_size.value == 0:
603
380
return None
604
381
cert = cert_list[0]
608
385
def fingerprint(openpgp):
609
386
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
610
387
# New GnuTLS "datum" with the OpenPGP public key
611
datum = (gnutls.library.types
612
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
613
ctypes.POINTER
614
(ctypes.c_ubyte)),
615
ctypes.c_uint(len(openpgp))))
388
datum = gnutls.library.types.gnutls_datum_t\
389
(ctypes.cast(ctypes.c_char_p(openpgp),
390
ctypes.POINTER(ctypes.c_ubyte)),
391
ctypes.c_uint(len(openpgp)))
616
392
# New empty GnuTLS certificate
617
393
crt = gnutls.library.types.gnutls_openpgp_crt_t()
618
(gnutls.library.functions
619
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
394
gnutls.library.functions.gnutls_openpgp_crt_init\
395
(ctypes.byref(crt))
620
396
# Import the OpenPGP public key into the certificate
621
(gnutls.library.functions
622
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
623
gnutls.library.constants
624
.GNUTLS_OPENPGP_FMT_RAW))
625
# Verify the self signature in the key
626
crtverify = ctypes.c_uint()
627
(gnutls.library.functions
628
.gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
629
if crtverify.value != 0:
630
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
631
raise gnutls.errors.CertificateSecurityError("Verify failed")
397
gnutls.library.functions.gnutls_openpgp_crt_import\
398
(crt, ctypes.byref(datum),
399
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
632
400
# New buffer for the fingerprint
633
buf = ctypes.create_string_buffer(20)
634
buf_len = ctypes.c_size_t()
401
buffer = ctypes.create_string_buffer(20)
402
buffer_length = ctypes.c_size_t()
635
403
# Get the fingerprint from the certificate into the buffer
636
(gnutls.library.functions
637
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
638
ctypes.byref(buf_len)))
404
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
405
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
639
406
# Deinit the certificate
640
407
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
641
408
# Convert the buffer to a Python bytestring
642
fpr = ctypes.string_at(buf, buf_len.value)
409
fpr = ctypes.string_at(buffer, buffer_length.value)
643
410
# Convert the bytestring to hexadecimal notation
644
411
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
645
412
return hex_fpr
646
413
647
414
648
class TCP_handler(SocketServer.BaseRequestHandler, object):
415
class tcp_handler(SocketServer.BaseRequestHandler, object):
649
416
"""A TCP request handler class.
650
417
Instantiated by IPv6_TCPServer for each request to handle it.
651
418
Note: This will run in its own forked process."""
652
419
653
420
def handle(self):
654
421
logger.info(u"TCP connection from: %s",
655
unicode(self.client_address))
656
session = (gnutls.connection
657
.ClientSession(self.request,
658
gnutls.connection
659
.X509Credentials()))
422
unicode(self.client_address))
423
session = gnutls.connection.ClientSession\
424
(self.request, gnutls.connection.X509Credentials())
660
425
661
426
line = self.request.makefile().readline()
662
427
logger.debug(u"Protocol version: %r", line)
675
440
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
676
441
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
677
442
# "+DHE-DSS"))
678
# Use a fallback default, since this MUST be set.
679
priority = self.server.settings.get("priority", "NORMAL")
680
(gnutls.library.functions
681
.gnutls_priority_set_direct(session._c_object,
682
priority, None))
443
priority = "NORMAL" # Fallback default, since this
444
# MUST be set.
445
if self.server.settings["priority"]:
446
priority = self.server.settings["priority"]
447
gnutls.library.functions.gnutls_priority_set_direct\
448
(session._c_object, priority, None);
683
449
684
450
try:
685
451
session.handshake()
695
461
session.bye()
696
462
return
697
463
logger.debug(u"Fingerprint: %s", fpr)
464
client = None
698
465
for c in self.server.clients:
699
466
if c.fingerprint == fpr:
700
467
client = c
701
468
break
702
else:
469
if not client:
703
470
logger.warning(u"Client not found for fingerprint: %s",
704
471
fpr)
705
472
session.bye()
712
479
vars(client))
713
480
session.bye()
714
481
return
715
## This won't work here, since we're in a fork.
716
# client.checked_ok()
717
482
sent_size = 0
718
483
while sent_size < len(client.secret):
719
484
sent = session.send(client.secret[sent_size:])
724
489
session.bye()
725
490
726
491
727
class IPv6_TCPServer(SocketServer.ForkingMixIn,
728
SocketServer.TCPServer, object):
492
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
729
493
"""IPv6 TCP server. Accepts 'None' as address and/or port.
730
494
Attributes:
731
495
settings: Server settings
732
496
clients: Set() of Client objects
733
enabled: Boolean; whether this server is activated yet
734
497
"""
735
498
address_family = socket.AF_INET6
736
499
def __init__(self, *args, **kwargs):
740
503
if "clients" in kwargs:
741
504
self.clients = kwargs["clients"]
742
505
del kwargs["clients"]
743
self.enabled = False
744
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
506
return super(type(self), self).__init__(*args, **kwargs)
745
507
def server_bind(self):
746
508
"""This overrides the normal server_bind() function
747
509
to bind to an interface if one was specified, and also NOT to
766
528
in6addr_any = "::"
767
529
self.server_address = (in6addr_any,
768
530
self.server_address[1])
769
elif not self.server_address[1]:
531
elif self.server_address[1] is None:
770
532
self.server_address = (self.server_address[0],
771
533
0)
772
# if self.settings["interface"]:
773
# self.server_address = (self.server_address[0],
774
# 0, # port
775
# 0, # flowinfo
776
# if_nametoindex
777
# (self.settings
778
# ["interface"]))
779
return super(IPv6_TCPServer, self).server_bind()
780
def server_activate(self):
781
if self.enabled:
782
return super(IPv6_TCPServer, self).server_activate()
783
def enable(self):
784
self.enabled = True
534
return super(type(self), self).server_bind()
785
535
786
536
787
537
def string_to_delta(interval):
797
547
datetime.timedelta(1)
798
548
>>> string_to_delta(u'1w')
799
549
datetime.timedelta(7)
800
>>> string_to_delta('5m 30s')
801
datetime.timedelta(0, 330)
802
550
"""
803
timevalue = datetime.timedelta(0)
804
for s in interval.split():
805
try:
806
suffix = unicode(s[-1])
807
value = int(s[:-1])
808
if suffix == u"d":
809
delta = datetime.timedelta(value)
810
elif suffix == u"s":
811
delta = datetime.timedelta(0, value)
812
elif suffix == u"m":
813
delta = datetime.timedelta(0, 0, 0, 0, value)
814
elif suffix == u"h":
815
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
816
elif suffix == u"w":
817
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
818
else:
819
raise ValueError
820
except (ValueError, IndexError):
551
try:
552
suffix=unicode(interval[-1])
553
value=int(interval[:-1])
554
if suffix == u"d":
555
delta = datetime.timedelta(value)
556
elif suffix == u"s":
557
delta = datetime.timedelta(0, value)
558
elif suffix == u"m":
559
delta = datetime.timedelta(0, 0, 0, 0, value)
560
elif suffix == u"h":
561
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
562
elif suffix == u"w":
563
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
564
else:
821
565
raise ValueError
822
timevalue += delta
823
return timevalue
566
except (ValueError, IndexError):
567
raise ValueError
568
return delta
824
569
825
570
826
571
def server_state_changed(state):
827
572
"""Derived from the Avahi example code"""
828
573
if state == avahi.SERVER_COLLISION:
829
logger.error(u"Zeroconf server name collision")
574
logger.error(u"Server name collision")
830
575
service.remove()
831
576
elif state == avahi.SERVER_RUNNING:
832
577
service.add()
834
579
835
580
def entry_group_state_changed(state, error):
836
581
"""Derived from the Avahi example code"""
837
logger.debug(u"Avahi state change: %i", state)
582
logger.debug(u"state change: %i", state)
838
583
839
584
if state == avahi.ENTRY_GROUP_ESTABLISHED:
840
logger.debug(u"Zeroconf service established.")
585
logger.debug(u"Service established.")
841
586
elif state == avahi.ENTRY_GROUP_COLLISION:
842
logger.warning(u"Zeroconf service name collision.")
587
logger.warning(u"Service name collision.")
843
588
service.rename()
844
589
elif state == avahi.ENTRY_GROUP_FAILURE:
845
logger.critical(u"Avahi: Error in group state changed %s",
590
logger.critical(u"Error in group state changed %s",
846
591
unicode(error))
847
raise AvahiGroupError(u"State changed: %s" % unicode(error))
592
raise AvahiGroupError("State changed: %s", str(error))
848
593
849
594
def if_nametoindex(interface):
850
595
"""Call the C function if_nametoindex(), or equivalent"""
851
596
global if_nametoindex
852
597
try:
853
if_nametoindex = (ctypes.cdll.LoadLibrary
854
(ctypes.util.find_library("c"))
855
.if_nametoindex)
598
if "ctypes.util" not in sys.modules:
599
import ctypes.util
600
if_nametoindex = ctypes.cdll.LoadLibrary\
601
(ctypes.util.find_library("c")).if_nametoindex
856
602
except (OSError, AttributeError):
857
603
if "struct" not in sys.modules:
858
604
import struct
861
607
def if_nametoindex(interface):
862
608
"Get an interface index the hard way, i.e. using fcntl()"
863
609
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
864
with closing(socket.socket()) as s:
865
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
866
struct.pack("16s16x", interface))
610
s = socket.socket()
611
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
612
struct.pack("16s16x", interface))
613
s.close()
867
614
interface_index = struct.unpack("I", ifreq[16:20])[0]
868
615
return interface_index
869
616
return if_nametoindex(interface)
870
617
871
618
872
def daemon(nochdir = False, noclose = False):
619
def daemon(nochdir, noclose):
873
620
"""See daemon(3). Standard BSD Unix function.
874
621
This should really exist as os.daemon, but it doesn't (yet)."""
875
622
if os.fork():
893
640
894
641
895
642
def main():
896
parser = optparse.OptionParser(version = "%%prog %s" % version)
643
global main_loop_started
644
main_loop_started = False
645
646
parser = OptionParser()
897
647
parser.add_option("-i", "--interface", type="string",
898
648
metavar="IF", help="Bind to interface IF")
899
649
parser.add_option("-a", "--address", type="string",
900
650
help="Address to listen for requests on")
901
651
parser.add_option("-p", "--port", type="int",
902
652
help="Port number to receive requests on")
903
parser.add_option("--check", action="store_true",
653
parser.add_option("--check", action="store_true", default=False,
904
654
help="Run self-test")
905
parser.add_option("--debug", action="store_true",
655
parser.add_option("--debug", action="store_true", default=False,
906
656
help="Debug mode; run in foreground and log to"
907
657
" terminal")
908
658
parser.add_option("--priority", type="string", help="GnuTLS"
913
663
default="/etc/mandos", metavar="DIR",
914
664
help="Directory to search for configuration"
915
665
" files")
916
parser.add_option("--no-dbus", action="store_false",
917
dest="use_dbus",
918
help="Do not provide D-Bus system bus"
919
" interface")
920
options = parser.parse_args()[0]
666
(options, args) = parser.parse_args()
921
667
922
668
if options.check:
923
669
import doctest
932
678
"priority":
933
679
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
934
680
"servicename": "Mandos",
935
"use_dbus": "True",
936
681
}
937
682
938
683
# Parse config file for server-global settings
939
684
server_config = ConfigParser.SafeConfigParser(server_defaults)
940
685
del server_defaults
941
server_config.read(os.path.join(options.configdir, "mandos.conf"))
686
server_config.read(os.path.join(options.configdir, "server.conf"))
687
server_section = "server"
942
688
# Convert the SafeConfigParser object to a dict
943
server_settings = server_config.defaults()
944
# Use getboolean on the boolean config options
945
server_settings["debug"] = (server_config.getboolean
946
("DEFAULT", "debug"))
947
server_settings["use_dbus"] = (server_config.getboolean
948
("DEFAULT", "use_dbus"))
689
server_settings = dict(server_config.items(server_section))
690
# Use getboolean on the boolean config option
691
server_settings["debug"] = server_config.getboolean\
692
(server_section, "debug")
949
693
del server_config
950
694
951
695
# Override the settings from the config file with command line
952
696
# options, if set.
953
697
for option in ("interface", "address", "port", "debug",
954
"priority", "servicename", "configdir",
955
"use_dbus"):
698
"priority", "servicename", "configdir"):
956
699
value = getattr(options, option)
957
700
if value is not None:
958
701
server_settings[option] = value
959
702
del options
960
703
# Now we have our good server settings in "server_settings"
961
704
962
# For convenience
963
debug = server_settings["debug"]
964
use_dbus = server_settings["use_dbus"]
965
966
if not debug:
967
syslogger.setLevel(logging.WARNING)
968
console.setLevel(logging.WARNING)
969
970
if server_settings["servicename"] != "Mandos":
971
syslogger.setFormatter(logging.Formatter
972
('Mandos (%s): %%(levelname)s:'
973
' %%(message)s'
974
% server_settings["servicename"]))
975
976
705
# Parse config file with clients
977
706
client_defaults = { "timeout": "1h",
978
707
"interval": "5m",
979
"checker": "fping -q -- %%(host)s",
980
"host": "",
708
"checker": "fping -q -- %%(fqdn)s",
981
709
}
982
710
client_config = ConfigParser.SafeConfigParser(client_defaults)
983
711
client_config.read(os.path.join(server_settings["configdir"],
984
712
"clients.conf"))
985
713
986
clients = Set()
987
tcp_server = IPv6_TCPServer((server_settings["address"],
988
server_settings["port"]),
989
TCP_handler,
990
settings=server_settings,
991
clients=clients)
992
pidfilename = "/var/run/mandos.pid"
993
try:
994
pidfile = open(pidfilename, "w")
995
except IOError, error:
996
logger.error("Could not open file %r", pidfilename)
997
998
try:
999
uid = pwd.getpwnam("_mandos").pw_uid
1000
gid = pwd.getpwnam("_mandos").pw_gid
1001
except KeyError:
1002
try:
1003
uid = pwd.getpwnam("mandos").pw_uid
1004
gid = pwd.getpwnam("mandos").pw_gid
1005
except KeyError:
1006
try:
1007
uid = pwd.getpwnam("nobody").pw_uid
1008
gid = pwd.getpwnam("nogroup").pw_gid
1009
except KeyError:
1010
uid = 65534
1011
gid = 65534
1012
try:
1013
os.setuid(uid)
1014
os.setgid(gid)
1015
except OSError, error:
1016
if error[0] != errno.EPERM:
1017
raise error
1018
1019
714
global service
1020
715
service = AvahiService(name = server_settings["servicename"],
1021
servicetype = "_mandos._tcp", )
716
type = "_mandos._tcp", );
1022
717
if server_settings["interface"]:
1023
service.interface = (if_nametoindex
1024
(server_settings["interface"]))
718
service.interface = if_nametoindex(server_settings["interface"])
1025
719
1026
720
global main_loop
1027
721
global bus
1030
724
DBusGMainLoop(set_as_default=True )
1031
725
main_loop = gobject.MainLoop()
1032
726
bus = dbus.SystemBus()
1033
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1034
avahi.DBUS_PATH_SERVER),
1035
avahi.DBUS_INTERFACE_SERVER)
727
server = dbus.Interface(
728
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
729
avahi.DBUS_INTERFACE_SERVER )
1036
730
# End of Avahi example code
1037
if use_dbus:
1038
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
731
732
debug = server_settings["debug"]
733
734
if debug:
735
console = logging.StreamHandler()
736
# console.setLevel(logging.DEBUG)
737
console.setFormatter(logging.Formatter\
738
('%(levelname)s: %(message)s'))
739
logger.addHandler(console)
740
del console
741
742
clients = Set()
743
def remove_from_clients(client):
744
clients.remove(client)
745
if not clients:
746
logger.critical(u"No clients left, exiting")
747
sys.exit()
1039
748
1040
749
clients.update(Set(Client(name = section,
750
stop_hook = remove_from_clients,
1041
751
config
1042
= dict(client_config.items(section)),
1043
use_dbus = use_dbus)
752
= dict(client_config.items(section)))
1044
753
for section in client_config.sections()))
1045
if not clients:
1046
logger.warning(u"No clients defined")
1047
1048
if debug:
1049
# Redirect stdin so all checkers get /dev/null
1050
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1051
os.dup2(null, sys.stdin.fileno())
1052
if null > 2:
1053
os.close(null)
1054
else:
1055
# No console logging
1056
logger.removeHandler(console)
1057
# Close all input and output, do double fork, etc.
1058
daemon()
1059
1060
try:
1061
pid = os.getpid()
1062
pidfile.write(str(pid) + "\n")
1063
pidfile.close()
1064
del pidfile
1065
except IOError:
1066
logger.error(u"Could not write to file %r with PID %d",
1067
pidfilename, pid)
1068
except NameError:
1069
# "pidfile" was never created
1070
pass
1071
del pidfilename
754
755
if not debug:
756
daemon(False, False)
1072
757
1073
758
def cleanup():
1074
759
"Cleanup function; run on exit"
1081
766
1082
767
while clients:
1083
768
client = clients.pop()
1084
client.disable_hook = None
1085
client.disable()
769
client.stop_hook = None
770
client.stop()
1086
771
1087
772
atexit.register(cleanup)
1088
773
1091
776
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1092
777
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1093
778
1094
if use_dbus:
1095
class MandosServer(dbus.service.Object):
1096
"""A D-Bus proxy object"""
1097
def __init__(self):
1098
dbus.service.Object.__init__(self, bus, "/")
1099
_interface = u"se.bsnet.fukt.Mandos"
1100
1101
@dbus.service.signal(_interface, signature="oa{sv}")
1102
def ClientAdded(self, objpath, properties):
1103
"D-Bus signal"
1104
pass
1105
1106
@dbus.service.signal(_interface, signature="os")
1107
def ClientRemoved(self, objpath, name):
1108
"D-Bus signal"
1109
pass
1110
1111
@dbus.service.method(_interface, out_signature="ao")
1112
def GetAllClients(self):
1113
return dbus.Array(c.dbus_object_path for c in clients)
1114
1115
@dbus.service.method(_interface, out_signature="a{oa{sv}}")
1116
def GetAllClientsWithProperties(self):
1117
return dbus.Dictionary(
1118
((c.dbus_object_path, c.GetAllProperties())
1119
for c in clients),
1120
signature="oa{sv}")
1121
1122
@dbus.service.method(_interface, in_signature="o")
1123
def RemoveClient(self, object_path):
1124
for c in clients:
1125
if c.dbus_object_path == object_path:
1126
clients.remove(c)
1127
# Don't signal anything except ClientRemoved
1128
c.use_dbus = False
1129
c.disable()
1130
# Emit D-Bus signal
1131
self.ClientRemoved(object_path, c.name)
1132
return
1133
raise KeyError
1134
1135
del _interface
1136
1137
mandos_server = MandosServer()
1138
1139
779
for client in clients:
1140
if use_dbus:
1141
# Emit D-Bus signal
1142
mandos_server.ClientAdded(client.dbus_object_path,
1143
client.GetAllProperties())
1144
client.enable()
1145
1146
tcp_server.enable()
1147
tcp_server.server_activate()
1148
780
client.start()
781
782
tcp_server = IPv6_TCPServer((server_settings["address"],
783
server_settings["port"]),
784
tcp_handler,
785
settings=server_settings,
786
clients=clients)
1149
787
# Find out what port we got
1150
788
service.port = tcp_server.socket.getsockname()[1]
1151
789
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1165
803
1166
804
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1167
805
lambda *args, **kwargs:
1168
(tcp_server.handle_request
1169
(*args[2:], **kwargs) or True))
806
tcp_server.handle_request\
807
(*args[2:], **kwargs) or True)
1170
808
1171
logger.debug(u"Starting main loop")
809
logger.debug("Starting main loop")
810
main_loop_started = True
1172
811
main_loop.run()
1173
812
except AvahiError, error:
1174
logger.critical(u"AvahiError: %s", error)
813
logger.critical(u"AvahiError: %s" + unicode(error))
1175
814
sys.exit(1)
1176
815
except KeyboardInterrupt:
1177
816
if debug:
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0