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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 [%(process)d]: %(levelname)s:'
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' %(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 [%(process)d]:'
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' %(levelname)s: %(message)s'))
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logger.addHandler(console)
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73
85
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class AvahiError(Exception):
86
def __init__(self, value, *args, **kwargs):
75
def __init__(self, value):
87
76
self.value = value
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super(AvahiError, self).__init__(value, *args, **kwargs)
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def __unicode__(self):
90
return unicode(repr(self.value))
77
def __str__(self):
78
return repr(self.value)
91
79
92
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class AvahiServiceError(AvahiError):
93
81
pass
113
101
a sensible number of times
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102
"""
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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 = []
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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)
122
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
150
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if group is None:
151
group = dbus.Interface(bus.get_object
152
(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):
175
"""Convert a UTC datetime.datetime() to a D-Bus type."""
176
return dbus.String(dt.isoformat(), variant_level=variant_level)
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class Client(dbus.service.Object):
159
class Client(object):
180
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"""A representation of a client host served by this server.
181
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Attributes:
182
name: string; from the config file, used in log messages and
183
D-Bus identifiers
162
name: string; from the config file, used in log messages
184
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fingerprint: string (40 or 32 hexadecimal digits); used to
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uniquely identify the client
186
secret: bytestring; sent verbatim (over TLS) to client
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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
197
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
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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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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):
210
"Return the 'timeout' attribute in milliseconds"
211
return ((self.timeout.days * 24 * 60 * 60 * 1000)
212
+ (self.timeout.seconds * 1000)
213
+ (self.timeout.microseconds // 1000))
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def interval_milliseconds(self):
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"Return the 'interval' attribute in milliseconds"
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return ((self.interval.days * 24 * 60 * 60 * 1000)
218
+ (self.interval.seconds * 1000)
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+ (self.interval.microseconds // 1000))
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def __init__(self, name = None, disable_hook=None, config=None,
222
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={}):
223
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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."""
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self.name = name
227
if config is None:
228
config = {}
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217
logger.debug(u"Creating client %r", self.name)
230
self.use_dbus = False # During __init__
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218
# Uppercase and remove spaces from fingerprint for later
232
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# comparison purposes with return value from the fingerprint()
233
220
# function
234
self.fingerprint = (config["fingerprint"].upper()
235
.replace(u" ", u""))
221
self.fingerprint = config["fingerprint"].upper()\
222
.replace(u" ", u"")
236
223
logger.debug(u" Fingerprint: %s", self.fingerprint)
237
224
if "secret" in config:
238
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self.secret = config["secret"].decode(u"base64")
239
226
elif "secfile" in config:
240
with closing(open(os.path.expanduser
241
(os.path.expandvars
242
(config["secfile"])))) as secfile:
243
self.secret = secfile.read()
227
sf = open(config["secfile"])
228
self.secret = sf.read()
229
sf.close()
244
230
else:
245
231
raise TypeError(u"No secret or secfile for client %s"
246
232
% self.name)
247
self.host = config.get("host", "")
248
self.created = datetime.datetime.utcnow()
249
self.enabled = False
250
self.last_enabled = None
233
self.fqdn = config.get("fqdn", "")
234
self.created = datetime.datetime.now()
251
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self.last_checked_ok = None
252
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self.timeout = string_to_delta(config["timeout"])
253
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self.interval = string_to_delta(config["interval"])
254
self.disable_hook = disable_hook
238
self.stop_hook = stop_hook
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self.checker = None
256
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self.checker_initiator_tag = None
257
self.disable_initiator_tag = None
241
self.stop_initiator_tag = None
258
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self.checker_callback_tag = None
259
self.checker_command = config["checker"]
260
self.last_connect = None
261
# Only now, when this client is initialized, can it show up on
262
# the D-Bus
263
self.use_dbus = use_dbus
264
if self.use_dbus:
265
self.dbus_object_path = (dbus.ObjectPath
266
("/clients/"
267
+ self.name.replace(".", "_")))
268
dbus.service.Object.__init__(self, bus,
269
self.dbus_object_path)
270
271
def enable(self):
243
self.check_command = config["checker"]
244
def start(self):
272
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"""Start this client's checker and timeout hooks"""
273
self.last_enabled = datetime.datetime.utcnow()
274
246
# Schedule a new checker to be started an 'interval' from now,
275
247
# and every interval from then on.
276
self.checker_initiator_tag = (gobject.timeout_add
277
(self.interval_milliseconds(),
278
self.start_checker))
248
self.checker_initiator_tag = gobject.timeout_add\
249
(self._interval_milliseconds,
250
self.start_checker)
279
251
# Also start a new checker *right now*.
280
252
self.start_checker()
281
# Schedule a disable() when 'timeout' has passed
282
self.disable_initiator_tag = (gobject.timeout_add
283
(self.timeout_milliseconds(),
284
self.disable))
285
self.enabled = True
286
if self.use_dbus:
287
# Emit D-Bus signals
288
self.PropertyChanged(dbus.String(u"enabled"),
289
dbus.Boolean(True, variant_level=1))
290
self.PropertyChanged(dbus.String(u"last_enabled"),
291
(_datetime_to_dbus(self.last_enabled,
292
variant_level=1)))
293
294
def disable(self):
295
"""Disable this client."""
296
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:
297
266
return False
298
logger.info(u"Disabling client %s", self.name)
299
if getattr(self, "disable_initiator_tag", False):
300
gobject.source_remove(self.disable_initiator_tag)
301
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
302
270
if getattr(self, "checker_initiator_tag", False):
303
271
gobject.source_remove(self.checker_initiator_tag)
304
272
self.checker_initiator_tag = None
305
273
self.stop_checker()
306
if self.disable_hook:
307
self.disable_hook(self)
308
self.enabled = False
309
if self.use_dbus:
310
# Emit D-Bus signal
311
self.PropertyChanged(dbus.String(u"enabled"),
312
dbus.Boolean(False, variant_level=1))
274
if self.stop_hook:
275
self.stop_hook(self)
313
276
# Do not run this again if called by a gobject.timeout_add
314
277
return False
315
316
278
def __del__(self):
317
self.disable_hook = None
318
self.disable()
319
320
def checker_callback(self, pid, condition, command):
279
self.stop_hook = None
280
self.stop()
281
def checker_callback(self, pid, condition):
321
282
"""The checker has completed, so take appropriate actions."""
283
now = datetime.datetime.now()
322
284
self.checker_callback_tag = None
323
285
self.checker = None
324
if self.use_dbus:
325
# Emit D-Bus signal
326
self.PropertyChanged(dbus.String(u"checker_running"),
327
dbus.Boolean(False, variant_level=1))
328
if os.WIFEXITED(condition):
329
exitstatus = os.WEXITSTATUS(condition)
330
if exitstatus == 0:
331
logger.info(u"Checker for %(name)s succeeded",
332
vars(self))
333
self.checked_ok()
334
else:
335
logger.info(u"Checker for %(name)s failed",
336
vars(self))
337
if self.use_dbus:
338
# Emit D-Bus signal
339
self.CheckerCompleted(dbus.Int16(exitstatus),
340
dbus.Int64(condition),
341
dbus.String(command))
342
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):
343
296
logger.warning(u"Checker for %(name)s crashed?",
344
297
vars(self))
345
if self.use_dbus:
346
# Emit D-Bus signal
347
self.CheckerCompleted(dbus.Int16(-1),
348
dbus.Int64(condition),
349
dbus.String(command))
350
351
def checked_ok(self):
352
"""Bump up the timeout for this client.
353
This should only be called when the client has been seen,
354
alive and well.
355
"""
356
self.last_checked_ok = datetime.datetime.utcnow()
357
gobject.source_remove(self.disable_initiator_tag)
358
self.disable_initiator_tag = (gobject.timeout_add
359
(self.timeout_milliseconds(),
360
self.disable))
361
if self.use_dbus:
362
# Emit D-Bus signal
363
self.PropertyChanged(
364
dbus.String(u"last_checked_ok"),
365
(_datetime_to_dbus(self.last_checked_ok,
366
variant_level=1)))
367
298
else:
299
logger.info(u"Checker for %(name)s failed",
300
vars(self))
368
301
def start_checker(self):
369
302
"""Start a new checker subprocess if one is not running.
370
303
If a checker already exists, leave it running and do
379
312
# is as it should be.
380
313
if self.checker is None:
381
314
try:
382
# In case checker_command has exactly one % operator
383
command = self.checker_command % self.host
315
# In case check_command has exactly one % operator
316
command = self.check_command % self.fqdn
384
317
except TypeError:
385
318
# Escape attributes for the shell
386
319
escaped_attrs = dict((key, re.escape(str(val)))
387
320
for key, val in
388
321
vars(self).iteritems())
389
322
try:
390
command = self.checker_command % escaped_attrs
323
command = self.check_command % escaped_attrs
391
324
except TypeError, error:
392
325
logger.error(u'Could not format string "%s":'
393
u' %s', self.checker_command, error)
326
u' %s', self.check_command, error)
394
327
return True # Try again later
395
328
try:
396
329
logger.info(u"Starting checker %r for %s",
397
330
command, self.name)
398
# We don't need to redirect stdout and stderr, since
399
# in normal mode, that is already done by daemon(),
400
# and in debug mode we don't want to. (Stdin is
401
# always replaced by /dev/null.)
402
331
self.checker = subprocess.Popen(command,
403
332
close_fds=True,
404
333
shell=True, cwd="/")
405
if self.use_dbus:
406
# Emit D-Bus signal
407
self.CheckerStarted(command)
408
self.PropertyChanged(
409
dbus.String("checker_running"),
410
dbus.Boolean(True, variant_level=1))
411
self.checker_callback_tag = (gobject.child_watch_add
412
(self.checker.pid,
413
self.checker_callback,
414
data=command))
415
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:
416
338
logger.error(u"Failed to start subprocess: %s",
417
339
error)
418
340
# Re-run this periodically if run by gobject.timeout_add
419
341
return True
420
421
342
def stop_checker(self):
422
343
"""Force the checker process, if any, to stop."""
423
344
if self.checker_callback_tag:
425
346
self.checker_callback_tag = None
426
347
if getattr(self, "checker", None) is None:
427
348
return
428
logger.debug(u"Stopping checker for %(name)s", vars(self))
349
logger.debug("Stopping checker for %(name)s", vars(self))
429
350
try:
430
351
os.kill(self.checker.pid, signal.SIGTERM)
431
352
#os.sleep(0.5)
435
356
if error.errno != errno.ESRCH: # No such process
436
357
raise
437
358
self.checker = None
438
if self.use_dbus:
439
self.PropertyChanged(dbus.String(u"checker_running"),
440
dbus.Boolean(False, variant_level=1))
441
442
359
def still_valid(self):
443
360
"""Has the timeout not yet passed for this client?"""
444
if not getattr(self, "enabled", False):
445
return False
446
now = datetime.datetime.utcnow()
361
now = datetime.datetime.now()
447
362
if self.last_checked_ok is None:
448
363
return now < (self.created + self.timeout)
449
364
else:
450
365
return now < (self.last_checked_ok + self.timeout)
451
452
## D-Bus methods & signals
453
_interface = u"se.bsnet.fukt.Mandos.Client"
454
455
# CheckedOK - method
456
CheckedOK = dbus.service.method(_interface)(checked_ok)
457
CheckedOK.__name__ = "CheckedOK"
458
459
# CheckerCompleted - signal
460
@dbus.service.signal(_interface, signature="nxs")
461
def CheckerCompleted(self, exitcode, waitstatus, command):
462
"D-Bus signal"
463
pass
464
465
# CheckerStarted - signal
466
@dbus.service.signal(_interface, signature="s")
467
def CheckerStarted(self, command):
468
"D-Bus signal"
469
pass
470
471
# GetAllProperties - method
472
@dbus.service.method(_interface, out_signature="a{sv}")
473
def GetAllProperties(self):
474
"D-Bus method"
475
return dbus.Dictionary({
476
dbus.String("name"):
477
dbus.String(self.name, variant_level=1),
478
dbus.String("fingerprint"):
479
dbus.String(self.fingerprint, variant_level=1),
480
dbus.String("host"):
481
dbus.String(self.host, variant_level=1),
482
dbus.String("created"):
483
_datetime_to_dbus(self.created, variant_level=1),
484
dbus.String("last_enabled"):
485
(_datetime_to_dbus(self.last_enabled,
486
variant_level=1)
487
if self.last_enabled is not None
488
else dbus.Boolean(False, variant_level=1)),
489
dbus.String("enabled"):
490
dbus.Boolean(self.enabled, variant_level=1),
491
dbus.String("last_checked_ok"):
492
(_datetime_to_dbus(self.last_checked_ok,
493
variant_level=1)
494
if self.last_checked_ok is not None
495
else dbus.Boolean (False, variant_level=1)),
496
dbus.String("timeout"):
497
dbus.UInt64(self.timeout_milliseconds(),
498
variant_level=1),
499
dbus.String("interval"):
500
dbus.UInt64(self.interval_milliseconds(),
501
variant_level=1),
502
dbus.String("checker"):
503
dbus.String(self.checker_command,
504
variant_level=1),
505
dbus.String("checker_running"):
506
dbus.Boolean(self.checker is not None,
507
variant_level=1),
508
dbus.String("object_path"):
509
dbus.ObjectPath(self.dbus_object_path,
510
variant_level=1)
511
}, signature="sv")
512
513
# IsStillValid - method
514
IsStillValid = (dbus.service.method(_interface, out_signature="b")
515
(still_valid))
516
IsStillValid.__name__ = "IsStillValid"
517
518
# PropertyChanged - signal
519
@dbus.service.signal(_interface, signature="sv")
520
def PropertyChanged(self, property, value):
521
"D-Bus signal"
522
pass
523
524
# SetChecker - method
525
@dbus.service.method(_interface, in_signature="s")
526
def SetChecker(self, checker):
527
"D-Bus setter method"
528
self.checker_command = checker
529
# Emit D-Bus signal
530
self.PropertyChanged(dbus.String(u"checker"),
531
dbus.String(self.checker_command,
532
variant_level=1))
533
534
# SetHost - method
535
@dbus.service.method(_interface, in_signature="s")
536
def SetHost(self, host):
537
"D-Bus setter method"
538
self.host = host
539
# Emit D-Bus signal
540
self.PropertyChanged(dbus.String(u"host"),
541
dbus.String(self.host, variant_level=1))
542
543
# SetInterval - method
544
@dbus.service.method(_interface, in_signature="t")
545
def SetInterval(self, milliseconds):
546
self.interval = datetime.timedelta(0, 0, 0, milliseconds)
547
# Emit D-Bus signal
548
self.PropertyChanged(dbus.String(u"interval"),
549
(dbus.UInt64(self.interval_milliseconds(),
550
variant_level=1)))
551
552
# SetSecret - method
553
@dbus.service.method(_interface, in_signature="ay",
554
byte_arrays=True)
555
def SetSecret(self, secret):
556
"D-Bus setter method"
557
self.secret = str(secret)
558
559
# SetTimeout - method
560
@dbus.service.method(_interface, in_signature="t")
561
def SetTimeout(self, milliseconds):
562
self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
563
# Emit D-Bus signal
564
self.PropertyChanged(dbus.String(u"timeout"),
565
(dbus.UInt64(self.timeout_milliseconds(),
566
variant_level=1)))
567
568
# Enable - method
569
Enable = dbus.service.method(_interface)(enable)
570
Enable.__name__ = "Enable"
571
572
# StartChecker - method
573
@dbus.service.method(_interface)
574
def StartChecker(self):
575
"D-Bus method"
576
self.start_checker()
577
578
# Disable - method
579
@dbus.service.method(_interface)
580
def Disable(self):
581
"D-Bus method"
582
self.disable()
583
584
# StopChecker - method
585
StopChecker = dbus.service.method(_interface)(stop_checker)
586
StopChecker.__name__ = "StopChecker"
587
588
del _interface
589
366
590
367
591
368
def peer_certificate(session):
592
369
"Return the peer's OpenPGP certificate as a bytestring"
593
370
# If not an OpenPGP certificate...
594
if (gnutls.library.functions
595
.gnutls_certificate_type_get(session._c_object)
596
!= 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:
597
374
# ...do the normal thing
598
375
return session.peer_certificate
599
list_size = ctypes.c_uint(1)
600
cert_list = (gnutls.library.functions
601
.gnutls_certificate_get_peers
602
(session._c_object, ctypes.byref(list_size)))
603
if not bool(cert_list) and list_size.value != 0:
604
raise gnutls.errors.GNUTLSError("error getting peer"
605
" certificate")
376
list_size = ctypes.c_uint()
377
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
378
(session._c_object, ctypes.byref(list_size))
606
379
if list_size.value == 0:
607
380
return None
608
381
cert = cert_list[0]
612
385
def fingerprint(openpgp):
613
386
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
614
387
# New GnuTLS "datum" with the OpenPGP public key
615
datum = (gnutls.library.types
616
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
617
ctypes.POINTER
618
(ctypes.c_ubyte)),
619
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)))
620
392
# New empty GnuTLS certificate
621
393
crt = gnutls.library.types.gnutls_openpgp_crt_t()
622
(gnutls.library.functions
623
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
394
gnutls.library.functions.gnutls_openpgp_crt_init\
395
(ctypes.byref(crt))
624
396
# Import the OpenPGP public key into the certificate
625
(gnutls.library.functions
626
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
627
gnutls.library.constants
628
.GNUTLS_OPENPGP_FMT_RAW))
629
# Verify the self signature in the key
630
crtverify = ctypes.c_uint()
631
(gnutls.library.functions
632
.gnutls_openpgp_crt_verify_self(crt, 0, ctypes.byref(crtverify)))
633
if crtverify.value != 0:
634
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
635
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)
636
400
# New buffer for the fingerprint
637
buf = ctypes.create_string_buffer(20)
638
buf_len = ctypes.c_size_t()
401
buffer = ctypes.create_string_buffer(20)
402
buffer_length = ctypes.c_size_t()
639
403
# Get the fingerprint from the certificate into the buffer
640
(gnutls.library.functions
641
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
642
ctypes.byref(buf_len)))
404
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
405
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
643
406
# Deinit the certificate
644
407
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
645
408
# Convert the buffer to a Python bytestring
646
fpr = ctypes.string_at(buf, buf_len.value)
409
fpr = ctypes.string_at(buffer, buffer_length.value)
647
410
# Convert the bytestring to hexadecimal notation
648
411
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
649
412
return hex_fpr
650
413
651
414
652
class TCP_handler(SocketServer.BaseRequestHandler, object):
415
class tcp_handler(SocketServer.BaseRequestHandler, object):
653
416
"""A TCP request handler class.
654
417
Instantiated by IPv6_TCPServer for each request to handle it.
655
418
Note: This will run in its own forked process."""
656
419
657
420
def handle(self):
658
421
logger.info(u"TCP connection from: %s",
659
unicode(self.client_address))
660
session = (gnutls.connection
661
.ClientSession(self.request,
662
gnutls.connection
663
.X509Credentials()))
422
unicode(self.client_address))
423
session = gnutls.connection.ClientSession\
424
(self.request, gnutls.connection.X509Credentials())
664
425
665
426
line = self.request.makefile().readline()
666
427
logger.debug(u"Protocol version: %r", line)
677
438
# using OpenPGP certificates.
678
439
679
440
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
680
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
681
# "+DHE-DSS"))
682
# Use a fallback default, since this MUST be set.
683
priority = self.server.settings.get("priority", "NORMAL")
684
(gnutls.library.functions
685
.gnutls_priority_set_direct(session._c_object,
686
priority, None))
441
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
442
# "+DHE-DSS"))
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);
687
449
688
450
try:
689
451
session.handshake()
692
454
# Do not run session.bye() here: the session is not
693
455
# established. Just abandon the request.
694
456
return
695
logger.debug(u"Handshake succeeded")
696
457
try:
697
458
fpr = fingerprint(peer_certificate(session))
698
459
except (TypeError, gnutls.errors.GNUTLSError), error:
700
461
session.bye()
701
462
return
702
463
logger.debug(u"Fingerprint: %s", fpr)
703
464
client = None
704
465
for c in self.server.clients:
705
466
if c.fingerprint == fpr:
706
467
client = c
707
468
break
708
else:
469
if not client:
709
470
logger.warning(u"Client not found for fingerprint: %s",
710
471
fpr)
711
472
session.bye()
718
479
vars(client))
719
480
session.bye()
720
481
return
721
## This won't work here, since we're in a fork.
722
# client.checked_ok()
723
482
sent_size = 0
724
483
while sent_size < len(client.secret):
725
484
sent = session.send(client.secret[sent_size:])
730
489
session.bye()
731
490
732
491
733
class IPv6_TCPServer(SocketServer.ForkingMixIn,
734
SocketServer.TCPServer, object):
492
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
735
493
"""IPv6 TCP server. Accepts 'None' as address and/or port.
736
494
Attributes:
737
495
settings: Server settings
738
496
clients: Set() of Client objects
739
enabled: Boolean; whether this server is activated yet
740
497
"""
741
498
address_family = socket.AF_INET6
742
499
def __init__(self, *args, **kwargs):
746
503
if "clients" in kwargs:
747
504
self.clients = kwargs["clients"]
748
505
del kwargs["clients"]
749
self.enabled = False
750
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
506
return super(type(self), self).__init__(*args, **kwargs)
751
507
def server_bind(self):
752
508
"""This overrides the normal server_bind() function
753
509
to bind to an interface if one was specified, and also NOT to
765
521
u" bind to interface %s",
766
522
self.settings["interface"])
767
523
else:
768
raise
524
raise error
769
525
# Only bind(2) the socket if we really need to.
770
526
if self.server_address[0] or self.server_address[1]:
771
527
if not self.server_address[0]:
772
528
in6addr_any = "::"
773
529
self.server_address = (in6addr_any,
774
530
self.server_address[1])
775
elif not self.server_address[1]:
531
elif self.server_address[1] is None:
776
532
self.server_address = (self.server_address[0],
777
533
0)
778
# if self.settings["interface"]:
779
# self.server_address = (self.server_address[0],
780
# 0, # port
781
# 0, # flowinfo
782
# if_nametoindex
783
# (self.settings
784
# ["interface"]))
785
return super(IPv6_TCPServer, self).server_bind()
786
def server_activate(self):
787
if self.enabled:
788
return super(IPv6_TCPServer, self).server_activate()
789
def enable(self):
790
self.enabled = True
534
return super(type(self), self).server_bind()
791
535
792
536
793
537
def string_to_delta(interval):
794
538
"""Parse a string and return a datetime.timedelta
795
539
796
540
>>> string_to_delta('7d')
797
541
datetime.timedelta(7)
798
542
>>> string_to_delta('60s')
803
547
datetime.timedelta(1)
804
548
>>> string_to_delta(u'1w')
805
549
datetime.timedelta(7)
806
>>> string_to_delta('5m 30s')
807
datetime.timedelta(0, 330)
808
550
"""
809
timevalue = datetime.timedelta(0)
810
for s in interval.split():
811
try:
812
suffix = unicode(s[-1])
813
value = int(s[:-1])
814
if suffix == u"d":
815
delta = datetime.timedelta(value)
816
elif suffix == u"s":
817
delta = datetime.timedelta(0, value)
818
elif suffix == u"m":
819
delta = datetime.timedelta(0, 0, 0, 0, value)
820
elif suffix == u"h":
821
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
822
elif suffix == u"w":
823
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
824
else:
825
raise ValueError
826
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:
827
565
raise ValueError
828
timevalue += delta
829
return timevalue
566
except (ValueError, IndexError):
567
raise ValueError
568
return delta
830
569
831
570
832
571
def server_state_changed(state):
833
572
"""Derived from the Avahi example code"""
834
573
if state == avahi.SERVER_COLLISION:
835
logger.error(u"Zeroconf server name collision")
574
logger.error(u"Server name collision")
836
575
service.remove()
837
576
elif state == avahi.SERVER_RUNNING:
838
577
service.add()
840
579
841
580
def entry_group_state_changed(state, error):
842
581
"""Derived from the Avahi example code"""
843
logger.debug(u"Avahi state change: %i", state)
582
logger.debug(u"state change: %i", state)
844
583
845
584
if state == avahi.ENTRY_GROUP_ESTABLISHED:
846
logger.debug(u"Zeroconf service established.")
585
logger.debug(u"Service established.")
847
586
elif state == avahi.ENTRY_GROUP_COLLISION:
848
logger.warning(u"Zeroconf service name collision.")
587
logger.warning(u"Service name collision.")
849
588
service.rename()
850
589
elif state == avahi.ENTRY_GROUP_FAILURE:
851
logger.critical(u"Avahi: Error in group state changed %s",
590
logger.critical(u"Error in group state changed %s",
852
591
unicode(error))
853
raise AvahiGroupError(u"State changed: %s" % unicode(error))
592
raise AvahiGroupError("State changed: %s", str(error))
854
593
855
594
def if_nametoindex(interface):
856
595
"""Call the C function if_nametoindex(), or equivalent"""
857
596
global if_nametoindex
858
597
try:
859
if_nametoindex = (ctypes.cdll.LoadLibrary
860
(ctypes.util.find_library("c"))
861
.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
862
602
except (OSError, AttributeError):
863
603
if "struct" not in sys.modules:
864
604
import struct
867
607
def if_nametoindex(interface):
868
608
"Get an interface index the hard way, i.e. using fcntl()"
869
609
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
870
with closing(socket.socket()) as s:
871
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
872
struct.pack("16s16x", interface))
610
s = socket.socket()
611
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
612
struct.pack("16s16x", interface))
613
s.close()
873
614
interface_index = struct.unpack("I", ifreq[16:20])[0]
874
615
return interface_index
875
616
return if_nametoindex(interface)
876
617
877
618
878
def daemon(nochdir = False, noclose = False):
619
def daemon(nochdir, noclose):
879
620
"""See daemon(3). Standard BSD Unix function.
880
621
This should really exist as os.daemon, but it doesn't (yet)."""
881
622
if os.fork():
899
640
900
641
901
642
def main():
902
parser = optparse.OptionParser(version = "%%prog %s" % version)
643
global main_loop_started
644
main_loop_started = False
645
646
parser = OptionParser()
903
647
parser.add_option("-i", "--interface", type="string",
904
648
metavar="IF", help="Bind to interface IF")
905
649
parser.add_option("-a", "--address", type="string",
906
650
help="Address to listen for requests on")
907
651
parser.add_option("-p", "--port", type="int",
908
652
help="Port number to receive requests on")
909
parser.add_option("--check", action="store_true",
653
parser.add_option("--check", action="store_true", default=False,
910
654
help="Run self-test")
911
parser.add_option("--debug", action="store_true",
655
parser.add_option("--debug", action="store_true", default=False,
912
656
help="Debug mode; run in foreground and log to"
913
657
" terminal")
914
658
parser.add_option("--priority", type="string", help="GnuTLS"
919
663
default="/etc/mandos", metavar="DIR",
920
664
help="Directory to search for configuration"
921
665
" files")
922
parser.add_option("--no-dbus", action="store_false",
923
dest="use_dbus",
924
help="Do not provide D-Bus system bus"
925
" interface")
926
options = parser.parse_args()[0]
666
(options, args) = parser.parse_args()
927
667
928
668
if options.check:
929
669
import doctest
938
678
"priority":
939
679
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
940
680
"servicename": "Mandos",
941
"use_dbus": "True",
942
681
}
943
682
944
683
# Parse config file for server-global settings
945
684
server_config = ConfigParser.SafeConfigParser(server_defaults)
946
685
del server_defaults
947
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"
948
688
# Convert the SafeConfigParser object to a dict
949
server_settings = server_config.defaults()
950
# Use the appropriate methods on the non-string config options
951
server_settings["debug"] = server_config.getboolean("DEFAULT",
952
"debug")
953
server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
954
"use_dbus")
955
if server_settings["port"]:
956
server_settings["port"] = server_config.getint("DEFAULT",
957
"port")
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")
958
693
del server_config
959
694
960
695
# Override the settings from the config file with command line
961
696
# options, if set.
962
697
for option in ("interface", "address", "port", "debug",
963
"priority", "servicename", "configdir",
964
"use_dbus"):
698
"priority", "servicename", "configdir"):
965
699
value = getattr(options, option)
966
700
if value is not None:
967
701
server_settings[option] = value
968
702
del options
969
703
# Now we have our good server settings in "server_settings"
970
704
971
# For convenience
972
debug = server_settings["debug"]
973
use_dbus = server_settings["use_dbus"]
974
975
if not debug:
976
syslogger.setLevel(logging.WARNING)
977
console.setLevel(logging.WARNING)
978
979
if server_settings["servicename"] != "Mandos":
980
syslogger.setFormatter(logging.Formatter
981
('Mandos (%s): %%(levelname)s:'
982
' %%(message)s'
983
% server_settings["servicename"]))
984
985
705
# Parse config file with clients
986
706
client_defaults = { "timeout": "1h",
987
707
"interval": "5m",
988
"checker": "fping -q -- %%(host)s",
989
"host": "",
708
"checker": "fping -q -- %%(fqdn)s",
990
709
}
991
710
client_config = ConfigParser.SafeConfigParser(client_defaults)
992
711
client_config.read(os.path.join(server_settings["configdir"],
993
712
"clients.conf"))
994
713
995
clients = Set()
996
tcp_server = IPv6_TCPServer((server_settings["address"],
997
server_settings["port"]),
998
TCP_handler,
999
settings=server_settings,
1000
clients=clients)
1001
pidfilename = "/var/run/mandos.pid"
1002
try:
1003
pidfile = open(pidfilename, "w")
1004
except IOError:
1005
logger.error("Could not open file %r", pidfilename)
1006
1007
try:
1008
uid = pwd.getpwnam("_mandos").pw_uid
1009
gid = pwd.getpwnam("_mandos").pw_gid
1010
except KeyError:
1011
try:
1012
uid = pwd.getpwnam("mandos").pw_uid
1013
gid = pwd.getpwnam("mandos").pw_gid
1014
except KeyError:
1015
try:
1016
uid = pwd.getpwnam("nobody").pw_uid
1017
gid = pwd.getpwnam("nogroup").pw_gid
1018
except KeyError:
1019
uid = 65534
1020
gid = 65534
1021
try:
1022
os.setgid(gid)
1023
os.setuid(uid)
1024
except OSError, error:
1025
if error[0] != errno.EPERM:
1026
raise error
1027
1028
# Enable all possible GnuTLS debugging
1029
if debug:
1030
# "Use a log level over 10 to enable all debugging options."
1031
# - GnuTLS manual
1032
gnutls.library.functions.gnutls_global_set_log_level(11)
1033
1034
@gnutls.library.types.gnutls_log_func
1035
def debug_gnutls(level, string):
1036
logger.debug("GnuTLS: %s", string[:-1])
1037
1038
(gnutls.library.functions
1039
.gnutls_global_set_log_function(debug_gnutls))
1040
1041
714
global service
1042
715
service = AvahiService(name = server_settings["servicename"],
1043
servicetype = "_mandos._tcp", )
716
type = "_mandos._tcp", );
1044
717
if server_settings["interface"]:
1045
service.interface = (if_nametoindex
1046
(server_settings["interface"]))
718
service.interface = if_nametoindex(server_settings["interface"])
1047
719
1048
720
global main_loop
1049
721
global bus
1052
724
DBusGMainLoop(set_as_default=True )
1053
725
main_loop = gobject.MainLoop()
1054
726
bus = dbus.SystemBus()
1055
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1056
avahi.DBUS_PATH_SERVER),
1057
avahi.DBUS_INTERFACE_SERVER)
727
server = dbus.Interface(
728
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
729
avahi.DBUS_INTERFACE_SERVER )
1058
730
# End of Avahi example code
1059
if use_dbus:
1060
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()
1061
748
1062
749
clients.update(Set(Client(name = section,
750
stop_hook = remove_from_clients,
1063
751
config
1064
= dict(client_config.items(section)),
1065
use_dbus = use_dbus)
752
= dict(client_config.items(section)))
1066
753
for section in client_config.sections()))
1067
if not clients:
1068
logger.warning(u"No clients defined")
1069
1070
if debug:
1071
# Redirect stdin so all checkers get /dev/null
1072
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1073
os.dup2(null, sys.stdin.fileno())
1074
if null > 2:
1075
os.close(null)
1076
else:
1077
# No console logging
1078
logger.removeHandler(console)
1079
# Close all input and output, do double fork, etc.
1080
daemon()
1081
1082
try:
1083
pid = os.getpid()
1084
pidfile.write(str(pid) + "\n")
1085
pidfile.close()
1086
del pidfile
1087
except IOError:
1088
logger.error(u"Could not write to file %r with PID %d",
1089
pidfilename, pid)
1090
except NameError:
1091
# "pidfile" was never created
1092
pass
1093
del pidfilename
754
755
if not debug:
756
daemon(False, False)
1094
757
1095
758
def cleanup():
1096
759
"Cleanup function; run on exit"
1103
766
1104
767
while clients:
1105
768
client = clients.pop()
1106
client.disable_hook = None
1107
client.disable()
769
client.stop_hook = None
770
client.stop()
1108
771
1109
772
atexit.register(cleanup)
1110
773
1113
776
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1114
777
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1115
778
1116
if use_dbus:
1117
class MandosServer(dbus.service.Object):
1118
"""A D-Bus proxy object"""
1119
def __init__(self):
1120
dbus.service.Object.__init__(self, bus, "/")
1121
_interface = u"se.bsnet.fukt.Mandos"
1122
1123
@dbus.service.signal(_interface, signature="oa{sv}")
1124
def ClientAdded(self, objpath, properties):
1125
"D-Bus signal"
1126
pass
1127
1128
@dbus.service.signal(_interface, signature="os")
1129
def ClientRemoved(self, objpath, name):
1130
"D-Bus signal"
1131
pass
1132
1133
@dbus.service.method(_interface, out_signature="ao")
1134
def GetAllClients(self):
1135
"D-Bus method"
1136
return dbus.Array(c.dbus_object_path for c in clients)
1137
1138
@dbus.service.method(_interface, out_signature="a{oa{sv}}")
1139
def GetAllClientsWithProperties(self):
1140
"D-Bus method"
1141
return dbus.Dictionary(
1142
((c.dbus_object_path, c.GetAllProperties())
1143
for c in clients),
1144
signature="oa{sv}")
1145
1146
@dbus.service.method(_interface, in_signature="o")
1147
def RemoveClient(self, object_path):
1148
"D-Bus method"
1149
for c in clients:
1150
if c.dbus_object_path == object_path:
1151
clients.remove(c)
1152
# Don't signal anything except ClientRemoved
1153
c.use_dbus = False
1154
c.disable()
1155
# Emit D-Bus signal
1156
self.ClientRemoved(object_path, c.name)
1157
return
1158
raise KeyError
1159
1160
del _interface
1161
1162
mandos_server = MandosServer()
1163
1164
779
for client in clients:
1165
if use_dbus:
1166
# Emit D-Bus signal
1167
mandos_server.ClientAdded(client.dbus_object_path,
1168
client.GetAllProperties())
1169
client.enable()
1170
1171
tcp_server.enable()
1172
tcp_server.server_activate()
1173
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)
1174
787
# Find out what port we got
1175
788
service.port = tcp_server.socket.getsockname()[1]
1176
789
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
1190
803
1191
804
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1192
805
lambda *args, **kwargs:
1193
(tcp_server.handle_request
1194
(*args[2:], **kwargs) or True))
806
tcp_server.handle_request\
807
(*args[2:], **kwargs) or True)
1195
808
1196
logger.debug(u"Starting main loop")
809
logger.debug("Starting main loop")
810
main_loop_started = True
1197
811
main_loop.run()
1198
812
except AvahiError, error:
1199
logger.critical(u"AvahiError: %s", error)
813
logger.critical(u"AvahiError: %s" + unicode(error))
1200
814
sys.exit(1)
1201
815
except KeyboardInterrupt:
1202
816
if debug:
1203
print >> sys.stderr
1204
logger.debug("Server received KeyboardInterrupt")
1205
logger.debug("Server exiting")
817
print
1206
818
1207
819
if __name__ == '__main__':
1208
820
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0