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- Committer: Teddy Hogeborn
- Date: 2009-04-16 06:47:28 UTC
- Revision ID: teddy@fukt.bsnet.se-20090416064728-c3d36mvgxo5q9aoh
* mandos: Import "SocketServer" as "socketserver" and "ConfigParser"
as "configparser". All users changed.
as "configparser". All users changed.
- files added:
- .bzr-builddeb
- debian
- debian/po
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- plugbasedclient.c => plugin-runner.c
- plugins.d/mandosclient.c => plugins.d/mandos-client.c
- plugins.d/passprompt.c => plugins.d/password-prompt.c
- files modified:
- Makefile
added
removed
mandos
1
1
#!/usr/bin/python
2
3
from __future__ import division
4
5
import SocketServer
2
# -*- mode: python; coding: utf-8 -*-
3
#
4
# Mandos server - give out binary blobs to connecting clients.
5
#
6
# This program is partly derived from an example program for an Avahi
7
# service publisher, downloaded from
8
# <http://avahi.org/wiki/PythonPublishExample>. This includes the
9
# methods "add" and "remove" in the "AvahiService" class, the
10
# "server_state_changed" and "entry_group_state_changed" functions,
11
# and some lines in "main".
12
#
13
# Everything else is
14
# Copyright © 2008,2009 Teddy Hogeborn
15
# Copyright © 2008,2009 Björn Påhlsson
16
#
17
# This program is free software: you can redistribute it and/or modify
18
# it under the terms of the GNU General Public License as published by
19
# the Free Software Foundation, either version 3 of the License, or
20
# (at your option) any later version.
21
#
22
# This program is distributed in the hope that it will be useful,
23
# but WITHOUT ANY WARRANTY; without even the implied warranty of
24
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
25
# GNU General Public License for more details.
26
#
27
# You should have received a copy of the GNU General Public License
28
# along with this program. If not, see
29
# <http://www.gnu.org/licenses/>.
30
#
31
# Contact the authors at <mandos@fukt.bsnet.se>.
32
#
33
34
from __future__ import division, with_statement, absolute_import
35
36
import SocketServer as socketserver
6
37
import socket
7
import select
8
from optparse import OptionParser
38
import optparse
9
39
import datetime
10
40
import errno
11
41
import gnutls.crypto
14
44
import gnutls.library.functions
15
45
import gnutls.library.constants
16
46
import gnutls.library.types
17
import ConfigParser
47
import ConfigParser as configparser
18
48
import sys
19
49
import re
20
50
import os
21
51
import signal
22
from sets import Set
23
52
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
57
import pwd
58
from contextlib import closing
59
import struct
60
import fcntl
24
61
25
62
import dbus
63
import dbus.service
26
64
import gobject
27
65
import avahi
28
66
from dbus.mainloop.glib import DBusGMainLoop
29
67
import ctypes
30
31
import logging
32
import logging.handlers
33
34
# logghandler.setFormatter(logging.Formatter('%(levelname)s %(message)s')
35
36
logger = logging.Logger('mandos')
37
logger.addHandler(logging.handlers.SysLogHandler(facility = logging.handlers.SysLogHandler.LOG_DAEMON))
38
39
# This variable is used to optionally bind to a specified interface.
40
# It is a global variable to fit in with the other variables from the
41
# Avahi server example code.
42
serviceInterface = avahi.IF_UNSPEC
43
# From the Avahi server example code:
44
serviceName = "Mandos"
45
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
46
servicePort = None # Not known at startup
47
serviceTXT = [] # TXT record for the service
48
domain = "" # Domain to publish on, default to .local
49
host = "" # Host to publish records for, default to localhost
50
group = None #our entry group
51
rename_count = 12 # Counter so we only rename after collisions a
52
# sensible number of times
68
import ctypes.util
69
70
try:
71
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
72
except AttributeError:
73
try:
74
from IN import SO_BINDTODEVICE
75
except ImportError:
76
# From /usr/include/asm/socket.h
77
SO_BINDTODEVICE = 25
78
79
80
version = "1.0.8"
81
82
logger = logging.Logger(u'mandos')
83
syslogger = (logging.handlers.SysLogHandler
84
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
85
address = "/dev/log"))
86
syslogger.setFormatter(logging.Formatter
87
(u'Mandos [%(process)d]: %(levelname)s:'
88
u' %(message)s'))
89
logger.addHandler(syslogger)
90
91
console = logging.StreamHandler()
92
console.setFormatter(logging.Formatter(u'%(name)s [%(process)d]:'
93
u' %(levelname)s:'
94
u' %(message)s'))
95
logger.addHandler(console)
96
97
class AvahiError(Exception):
98
def __init__(self, value, *args, **kwargs):
99
self.value = value
100
super(AvahiError, self).__init__(value, *args, **kwargs)
101
def __unicode__(self):
102
return unicode(repr(self.value))
103
104
class AvahiServiceError(AvahiError):
105
pass
106
107
class AvahiGroupError(AvahiError):
108
pass
109
110
111
class AvahiService(object):
112
"""An Avahi (Zeroconf) service.
113
114
Attributes:
115
interface: integer; avahi.IF_UNSPEC or an interface index.
116
Used to optionally bind to the specified interface.
117
name: string; Example: u'Mandos'
118
type: string; Example: u'_mandos._tcp'.
119
See <http://www.dns-sd.org/ServiceTypes.html>
120
port: integer; what port to announce
121
TXT: list of strings; TXT record for the service
122
domain: string; Domain to publish on, default to .local if empty.
123
host: string; Host to publish records for, default is localhost
124
max_renames: integer; maximum number of renames
125
rename_count: integer; counter so we only rename after collisions
126
a sensible number of times
127
"""
128
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
129
servicetype = None, port = None, TXT = None,
130
domain = u"", host = u"", max_renames = 32768,
131
protocol = avahi.PROTO_UNSPEC):
132
self.interface = interface
133
self.name = name
134
self.type = servicetype
135
self.port = port
136
self.TXT = TXT if TXT is not None else []
137
self.domain = domain
138
self.host = host
139
self.rename_count = 0
140
self.max_renames = max_renames
141
self.protocol = protocol
142
def rename(self):
143
"""Derived from the Avahi example code"""
144
if self.rename_count >= self.max_renames:
145
logger.critical(u"No suitable Zeroconf service name found"
146
u" after %i retries, exiting.",
147
self.rename_count)
148
raise AvahiServiceError(u"Too many renames")
149
self.name = server.GetAlternativeServiceName(self.name)
150
logger.info(u"Changing Zeroconf service name to %r ...",
151
self.name)
152
syslogger.setFormatter(logging.Formatter
153
(u'Mandos (%s) [%%(process)d]:'
154
u' %%(levelname)s: %%(message)s'
155
% self.name))
156
self.remove()
157
self.add()
158
self.rename_count += 1
159
def remove(self):
160
"""Derived from the Avahi example code"""
161
if group is not None:
162
group.Reset()
163
def add(self):
164
"""Derived from the Avahi example code"""
165
global group
166
if group is None:
167
group = dbus.Interface(bus.get_object
168
(avahi.DBUS_NAME,
169
server.EntryGroupNew()),
170
avahi.DBUS_INTERFACE_ENTRY_GROUP)
171
group.connect_to_signal('StateChanged',
172
entry_group_state_changed)
173
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
174
service.name, service.type)
175
group.AddService(
176
self.interface, # interface
177
self.protocol, # protocol
178
dbus.UInt32(0), # flags
179
self.name, self.type,
180
self.domain, self.host,
181
dbus.UInt16(self.port),
182
avahi.string_array_to_txt_array(self.TXT))
183
group.Commit()
184
185
# From the Avahi example code:
186
group = None # our entry group
53
187
# End of Avahi example code
54
188
55
189
190
def _datetime_to_dbus(dt, variant_level=0):
191
"""Convert a UTC datetime.datetime() to a D-Bus type."""
192
return dbus.String(dt.isoformat(), variant_level=variant_level)
193
194
56
195
class Client(object):
57
196
"""A representation of a client host served by this server.
197
58
198
Attributes:
59
name: string; from the config file, used in log messages
199
name: string; from the config file, used in log messages and
200
D-Bus identifiers
60
201
fingerprint: string (40 or 32 hexadecimal digits); used to
61
202
uniquely identify the client
62
secret: bytestring; sent verbatim (over TLS) to client
63
fqdn: string (FQDN); available for use by the checker command
64
created: datetime.datetime()
65
last_seen: datetime.datetime() or None if not yet seen
66
timeout: datetime.timedelta(); How long from last_seen until
67
this client is invalid
68
interval: datetime.timedelta(); How often to start a new checker
69
stop_hook: If set, called by stop() as stop_hook(self)
70
checker: subprocess.Popen(); a running checker process used
71
to see if the client lives.
72
Is None if no process is running.
203
secret: bytestring; sent verbatim (over TLS) to client
204
host: string; available for use by the checker command
205
created: datetime.datetime(); (UTC) object creation
206
last_enabled: datetime.datetime(); (UTC)
207
enabled: bool()
208
last_checked_ok: datetime.datetime(); (UTC) or None
209
timeout: datetime.timedelta(); How long from last_checked_ok
210
until this client is invalid
211
interval: datetime.timedelta(); How often to start a new checker
212
disable_hook: If set, called by disable() as disable_hook(self)
213
checker: subprocess.Popen(); a running checker process used
214
to see if the client lives.
215
'None' if no process is running.
73
216
checker_initiator_tag: a gobject event source tag, or None
74
stop_initiator_tag: - '' -
217
disable_initiator_tag: - '' -
75
218
checker_callback_tag: - '' -
76
219
checker_command: string; External command which is run to check if
77
client lives. %()s expansions are done at
220
client lives. %() expansions are done at
78
221
runtime with vars(self) as dict, so that for
79
222
instance %(name)s can be used in the command.
80
Private attibutes:
81
_timeout: Real variable for 'timeout'
82
_interval: Real variable for 'interval'
83
_timeout_milliseconds: Used by gobject.timeout_add()
84
_interval_milliseconds: - '' -
223
current_checker_command: string; current running checker_command
85
224
"""
86
def _set_timeout(self, timeout):
87
"Setter function for 'timeout' attribute"
88
self._timeout = timeout
89
self._timeout_milliseconds = ((self.timeout.days
90
* 24 * 60 * 60 * 1000)
91
+ (self.timeout.seconds * 1000)
92
+ (self.timeout.microseconds
93
// 1000))
94
timeout = property(lambda self: self._timeout,
95
_set_timeout)
96
del _set_timeout
97
def _set_interval(self, interval):
98
"Setter function for 'interval' attribute"
99
self._interval = interval
100
self._interval_milliseconds = ((self.interval.days
101
* 24 * 60 * 60 * 1000)
102
+ (self.interval.seconds
103
* 1000)
104
+ (self.interval.microseconds
105
// 1000))
106
interval = property(lambda self: self._interval,
107
_set_interval)
108
del _set_interval
109
def __init__(self, name=None, options=None, stop_hook=None,
110
fingerprint=None, secret=None, secfile=None, fqdn=None,
111
timeout=None, interval=-1, checker=None):
225
226
@staticmethod
227
def _datetime_to_milliseconds(dt):
228
"Convert a datetime.datetime() to milliseconds"
229
return ((dt.days * 24 * 60 * 60 * 1000)
230
+ (dt.seconds * 1000)
231
+ (dt.microseconds // 1000))
232
233
def timeout_milliseconds(self):
234
"Return the 'timeout' attribute in milliseconds"
235
return self._datetime_to_milliseconds(self.timeout)
236
237
def interval_milliseconds(self):
238
"Return the 'interval' attribute in milliseconds"
239
return self._datetime_to_milliseconds(self.interval)
240
241
def __init__(self, name = None, disable_hook=None, config=None):
242
"""Note: the 'checker' key in 'config' sets the
243
'checker_command' attribute and *not* the 'checker'
244
attribute."""
112
245
self.name = name
113
# Uppercase and remove spaces from fingerprint
114
# for later comparison purposes with return value of
115
# the fingerprint() function
116
self.fingerprint = fingerprint.upper().replace(u" ", u"")
117
if secret:
118
self.secret = secret.decode(u"base64")
119
elif secfile:
120
sf = open(secfile)
121
self.secret = sf.read()
122
sf.close()
123
else:
124
raise RuntimeError(u"No secret or secfile for client %s"
125
% self.name)
126
self.fqdn = fqdn # string
127
self.created = datetime.datetime.now()
128
self.last_seen = None
129
if timeout is None:
130
timeout = options.timeout
131
self.timeout = timeout
132
if interval == -1:
133
interval = options.interval
134
else:
135
interval = string_to_delta(interval)
136
self.interval = interval
137
self.stop_hook = stop_hook
246
if config is None:
247
config = {}
248
logger.debug(u"Creating client %r", self.name)
249
# Uppercase and remove spaces from fingerprint for later
250
# comparison purposes with return value from the fingerprint()
251
# function
252
self.fingerprint = (config[u"fingerprint"].upper()
253
.replace(u" ", u""))
254
logger.debug(u" Fingerprint: %s", self.fingerprint)
255
if u"secret" in config:
256
self.secret = config[u"secret"].decode(u"base64")
257
elif u"secfile" in config:
258
with closing(open(os.path.expanduser
259
(os.path.expandvars
260
(config[u"secfile"])))) as secfile:
261
self.secret = secfile.read()
262
else:
263
raise TypeError(u"No secret or secfile for client %s"
264
% self.name)
265
self.host = config.get(u"host", u"")
266
self.created = datetime.datetime.utcnow()
267
self.enabled = False
268
self.last_enabled = None
269
self.last_checked_ok = None
270
self.timeout = string_to_delta(config[u"timeout"])
271
self.interval = string_to_delta(config[u"interval"])
272
self.disable_hook = disable_hook
138
273
self.checker = None
139
274
self.checker_initiator_tag = None
140
self.stop_initiator_tag = None
275
self.disable_initiator_tag = None
141
276
self.checker_callback_tag = None
142
self.check_command = checker
143
def start(self):
144
"""Start this clients checker and timeout hooks"""
277
self.checker_command = config[u"checker"]
278
self.current_checker_command = None
279
self.last_connect = None
280
281
def enable(self):
282
"""Start this client's checker and timeout hooks"""
283
self.last_enabled = datetime.datetime.utcnow()
145
284
# Schedule a new checker to be started an 'interval' from now,
146
285
# and every interval from then on.
147
self.checker_initiator_tag = gobject.timeout_add\
148
(self._interval_milliseconds,
149
self.start_checker)
286
self.checker_initiator_tag = (gobject.timeout_add
287
(self.interval_milliseconds(),
288
self.start_checker))
150
289
# Also start a new checker *right now*.
151
290
self.start_checker()
152
# Schedule a stop() when 'timeout' has passed
153
self.stop_initiator_tag = gobject.timeout_add\
154
(self._timeout_milliseconds,
155
self.stop)
156
def stop(self):
157
"""Stop this client.
158
The possibility that this client might be restarted is left
159
open, but not currently used."""
160
logger.debug(u"Stopping client %s", self.name)
161
self.secret = None
162
if self.stop_initiator_tag:
163
gobject.source_remove(self.stop_initiator_tag)
164
self.stop_initiator_tag = None
165
if self.checker_initiator_tag:
291
# Schedule a disable() when 'timeout' has passed
292
self.disable_initiator_tag = (gobject.timeout_add
293
(self.timeout_milliseconds(),
294
self.disable))
295
self.enabled = True
296
297
def disable(self):
298
"""Disable this client."""
299
if not getattr(self, "enabled", False):
300
return False
301
logger.info(u"Disabling client %s", self.name)
302
if getattr(self, u"disable_initiator_tag", False):
303
gobject.source_remove(self.disable_initiator_tag)
304
self.disable_initiator_tag = None
305
if getattr(self, u"checker_initiator_tag", False):
166
306
gobject.source_remove(self.checker_initiator_tag)
167
307
self.checker_initiator_tag = None
168
308
self.stop_checker()
169
if self.stop_hook:
170
self.stop_hook(self)
309
if self.disable_hook:
310
self.disable_hook(self)
311
self.enabled = False
171
312
# Do not run this again if called by a gobject.timeout_add
172
313
return False
314
173
315
def __del__(self):
174
# Some code duplication here and in stop()
175
if hasattr(self, "stop_initiator_tag") \
176
and self.stop_initiator_tag:
177
gobject.source_remove(self.stop_initiator_tag)
178
self.stop_initiator_tag = None
179
if hasattr(self, "checker_initiator_tag") \
180
and self.checker_initiator_tag:
181
gobject.source_remove(self.checker_initiator_tag)
182
self.checker_initiator_tag = None
183
self.stop_checker()
184
def checker_callback(self, pid, condition):
316
self.disable_hook = None
317
self.disable()
318
319
def checker_callback(self, pid, condition, command):
185
320
"""The checker has completed, so take appropriate actions."""
186
now = datetime.datetime.now()
187
if os.WIFEXITED(condition) \
188
and (os.WEXITSTATUS(condition) == 0):
189
logger.debug(u"Checker for %(name)s succeeded",
190
vars(self))
191
self.last_seen = now
192
gobject.source_remove(self.stop_initiator_tag)
193
self.stop_initiator_tag = gobject.timeout_add\
194
(self._timeout_milliseconds,
195
self.stop)
196
if not os.WIFEXITED(condition):
321
self.checker_callback_tag = None
322
self.checker = None
323
if os.WIFEXITED(condition):
324
exitstatus = os.WEXITSTATUS(condition)
325
if exitstatus == 0:
326
logger.info(u"Checker for %(name)s succeeded",
327
vars(self))
328
self.checked_ok()
329
else:
330
logger.info(u"Checker for %(name)s failed",
331
vars(self))
332
else:
197
333
logger.warning(u"Checker for %(name)s crashed?",
198
334
vars(self))
199
else:
200
logger.debug(u"Checker for %(name)s failed",
201
vars(self))
202
self.checker = None
203
self.checker_callback_tag = None
335
336
def checked_ok(self):
337
"""Bump up the timeout for this client.
338
339
This should only be called when the client has been seen,
340
alive and well.
341
"""
342
self.last_checked_ok = datetime.datetime.utcnow()
343
gobject.source_remove(self.disable_initiator_tag)
344
self.disable_initiator_tag = (gobject.timeout_add
345
(self.timeout_milliseconds(),
346
self.disable))
347
204
348
def start_checker(self):
205
349
"""Start a new checker subprocess if one is not running.
350
206
351
If a checker already exists, leave it running and do
207
352
nothing."""
353
# The reason for not killing a running checker is that if we
354
# did that, then if a checker (for some reason) started
355
# running slowly and taking more than 'interval' time, the
356
# client would inevitably timeout, since no checker would get
357
# a chance to run to completion. If we instead leave running
358
# checkers alone, the checker would have to take more time
359
# than 'timeout' for the client to be declared invalid, which
360
# is as it should be.
361
362
# If a checker exists, make sure it is not a zombie
363
if self.checker is not None:
364
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
365
if pid:
366
logger.warning(u"Checker was a zombie")
367
gobject.source_remove(self.checker_callback_tag)
368
self.checker_callback(pid, status,
369
self.current_checker_command)
370
# Start a new checker if needed
208
371
if self.checker is None:
209
logger.debug(u"Starting checker for %s",
210
self.name)
211
372
try:
212
command = self.check_command % self.fqdn
373
# In case checker_command has exactly one % operator
374
command = self.checker_command % self.host
213
375
except TypeError:
214
escaped_attrs = dict((key, re.escape(str(val)))
376
# Escape attributes for the shell
377
escaped_attrs = dict((key,
378
re.escape(unicode(str(val),
379
errors=
380
u'replace')))
215
381
for key, val in
216
382
vars(self).iteritems())
217
383
try:
218
command = self.check_command % escaped_attrs
384
command = self.checker_command % escaped_attrs
219
385
except TypeError, error:
220
logger.critical(u'Could not format string "%s": %s',
221
self.check_command, error)
386
logger.error(u'Could not format string "%s":'
387
u' %s', self.checker_command, error)
222
388
return True # Try again later
389
self.current_checker_command = command
223
390
try:
224
self.checker = subprocess.\
225
Popen(command,
226
stdout=subprocess.PIPE,
227
close_fds=True, shell=True,
228
cwd="/")
229
self.checker_callback_tag = gobject.\
230
child_watch_add(self.checker.pid,
231
self.\
232
checker_callback)
233
except subprocess.OSError, error:
391
logger.info(u"Starting checker %r for %s",
392
command, self.name)
393
# We don't need to redirect stdout and stderr, since
394
# in normal mode, that is already done by daemon(),
395
# and in debug mode we don't want to. (Stdin is
396
# always replaced by /dev/null.)
397
self.checker = subprocess.Popen(command,
398
close_fds=True,
399
shell=True, cwd=u"/")
400
self.checker_callback_tag = (gobject.child_watch_add
401
(self.checker.pid,
402
self.checker_callback,
403
data=command))
404
# The checker may have completed before the gobject
405
# watch was added. Check for this.
406
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
407
if pid:
408
gobject.source_remove(self.checker_callback_tag)
409
self.checker_callback(pid, status, command)
410
except OSError, error:
234
411
logger.error(u"Failed to start subprocess: %s",
235
412
error)
236
413
# Re-run this periodically if run by gobject.timeout_add
237
414
return True
415
238
416
def stop_checker(self):
239
417
"""Force the checker process, if any, to stop."""
240
if not hasattr(self, "checker") or self.checker is None:
418
if self.checker_callback_tag:
419
gobject.source_remove(self.checker_callback_tag)
420
self.checker_callback_tag = None
421
if getattr(self, u"checker", None) is None:
241
422
return
242
gobject.source_remove(self.checker_callback_tag)
243
self.checker_callback_tag = None
244
os.kill(self.checker.pid, signal.SIGTERM)
245
if self.checker.poll() is None:
246
os.kill(self.checker.pid, signal.SIGKILL)
423
logger.debug(u"Stopping checker for %(name)s", vars(self))
424
try:
425
os.kill(self.checker.pid, signal.SIGTERM)
426
#os.sleep(0.5)
427
#if self.checker.poll() is None:
428
# os.kill(self.checker.pid, signal.SIGKILL)
429
except OSError, error:
430
if error.errno != errno.ESRCH: # No such process
431
raise
247
432
self.checker = None
248
def still_valid(self, now=None):
433
434
def still_valid(self):
249
435
"""Has the timeout not yet passed for this client?"""
250
if now is None:
251
now = datetime.datetime.now()
252
if self.last_seen is None:
436
if not getattr(self, u"enabled", False):
437
return False
438
now = datetime.datetime.utcnow()
439
if self.last_checked_ok is None:
253
440
return now < (self.created + self.timeout)
254
441
else:
255
return now < (self.last_seen + self.timeout)
256
257
258
def peer_certificate(session):
259
# If not an OpenPGP certificate...
260
if gnutls.library.functions.gnutls_certificate_type_get\
261
(session._c_object) \
262
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
263
# ...do the normal thing
264
return session.peer_certificate
265
list_size = ctypes.c_uint()
266
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
267
(session._c_object, ctypes.byref(list_size))
268
if list_size.value == 0:
269
return None
270
cert = cert_list[0]
271
return ctypes.string_at(cert.data, cert.size)
272
273
274
def fingerprint(openpgp):
275
# New empty GnuTLS certificate
276
crt = gnutls.library.types.gnutls_openpgp_crt_t()
277
gnutls.library.functions.gnutls_openpgp_crt_init\
278
(ctypes.byref(crt))
279
# New GnuTLS "datum" with the OpenPGP public key
280
datum = gnutls.library.types.gnutls_datum_t\
281
(ctypes.cast(ctypes.c_char_p(openpgp),
282
ctypes.POINTER(ctypes.c_ubyte)),
283
ctypes.c_uint(len(openpgp)))
284
# Import the OpenPGP public key into the certificate
285
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
286
(crt,
287
ctypes.byref(datum),
288
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
289
# New buffer for the fingerprint
290
buffer = ctypes.create_string_buffer(20)
291
buffer_length = ctypes.c_size_t()
292
# Get the fingerprint from the certificate into the buffer
293
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
294
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
295
# Deinit the certificate
296
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
297
# Convert the buffer to a Python bytestring
298
fpr = ctypes.string_at(buffer, buffer_length.value)
299
# Convert the bytestring to hexadecimal notation
300
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
301
return hex_fpr
302
303
304
class tcp_handler(SocketServer.BaseRequestHandler, object):
305
"""A TCP request handler class.
306
Instantiated by IPv6_TCPServer for each request to handle it.
442
return now < (self.last_checked_ok + self.timeout)
443
444
445
class ClientDBus(Client, dbus.service.Object):
446
"""A Client class using D-Bus
447
448
Attributes:
449
dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
450
"""
451
# dbus.service.Object doesn't use super(), so we can't either.
452
453
def __init__(self, *args, **kwargs):
454
Client.__init__(self, *args, **kwargs)
455
# Only now, when this client is initialized, can it show up on
456
# the D-Bus
457
self.dbus_object_path = (dbus.ObjectPath
458
(u"/clients/"
459
+ self.name.replace(u".", u"_")))
460
dbus.service.Object.__init__(self, bus,
461
self.dbus_object_path)
462
def enable(self):
463
oldstate = getattr(self, u"enabled", False)
464
r = Client.enable(self)
465
if oldstate != self.enabled:
466
# Emit D-Bus signals
467
self.PropertyChanged(dbus.String(u"enabled"),
468
dbus.Boolean(True, variant_level=1))
469
self.PropertyChanged(dbus.String(u"last_enabled"),
470
(_datetime_to_dbus(self.last_enabled,
471
variant_level=1)))
472
return r
473
474
def disable(self, signal = True):
475
oldstate = getattr(self, u"enabled", False)
476
r = Client.disable(self)
477
if signal and oldstate != self.enabled:
478
# Emit D-Bus signal
479
self.PropertyChanged(dbus.String(u"enabled"),
480
dbus.Boolean(False, variant_level=1))
481
return r
482
483
def __del__(self, *args, **kwargs):
484
try:
485
self.remove_from_connection()
486
except LookupError:
487
pass
488
if hasattr(dbus.service.Object, u"__del__"):
489
dbus.service.Object.__del__(self, *args, **kwargs)
490
Client.__del__(self, *args, **kwargs)
491
492
def checker_callback(self, pid, condition, command,
493
*args, **kwargs):
494
self.checker_callback_tag = None
495
self.checker = None
496
# Emit D-Bus signal
497
self.PropertyChanged(dbus.String(u"checker_running"),
498
dbus.Boolean(False, variant_level=1))
499
if os.WIFEXITED(condition):
500
exitstatus = os.WEXITSTATUS(condition)
501
# Emit D-Bus signal
502
self.CheckerCompleted(dbus.Int16(exitstatus),
503
dbus.Int64(condition),
504
dbus.String(command))
505
else:
506
# Emit D-Bus signal
507
self.CheckerCompleted(dbus.Int16(-1),
508
dbus.Int64(condition),
509
dbus.String(command))
510
511
return Client.checker_callback(self, pid, condition, command,
512
*args, **kwargs)
513
514
def checked_ok(self, *args, **kwargs):
515
r = Client.checked_ok(self, *args, **kwargs)
516
# Emit D-Bus signal
517
self.PropertyChanged(
518
dbus.String(u"last_checked_ok"),
519
(_datetime_to_dbus(self.last_checked_ok,
520
variant_level=1)))
521
return r
522
523
def start_checker(self, *args, **kwargs):
524
old_checker = self.checker
525
if self.checker is not None:
526
old_checker_pid = self.checker.pid
527
else:
528
old_checker_pid = None
529
r = Client.start_checker(self, *args, **kwargs)
530
# Only if new checker process was started
531
if (self.checker is not None
532
and old_checker_pid != self.checker.pid):
533
# Emit D-Bus signal
534
self.CheckerStarted(self.current_checker_command)
535
self.PropertyChanged(
536
dbus.String(u"checker_running"),
537
dbus.Boolean(True, variant_level=1))
538
return r
539
540
def stop_checker(self, *args, **kwargs):
541
old_checker = getattr(self, u"checker", None)
542
r = Client.stop_checker(self, *args, **kwargs)
543
if (old_checker is not None
544
and getattr(self, u"checker", None) is None):
545
self.PropertyChanged(dbus.String(u"checker_running"),
546
dbus.Boolean(False, variant_level=1))
547
return r
548
549
## D-Bus methods & signals
550
_interface = u"se.bsnet.fukt.Mandos.Client"
551
552
# CheckedOK - method
553
@dbus.service.method(_interface)
554
def CheckedOK(self):
555
return self.checked_ok()
556
557
# CheckerCompleted - signal
558
@dbus.service.signal(_interface, signature=u"nxs")
559
def CheckerCompleted(self, exitcode, waitstatus, command):
560
"D-Bus signal"
561
pass
562
563
# CheckerStarted - signal
564
@dbus.service.signal(_interface, signature=u"s")
565
def CheckerStarted(self, command):
566
"D-Bus signal"
567
pass
568
569
# GetAllProperties - method
570
@dbus.service.method(_interface, out_signature=u"a{sv}")
571
def GetAllProperties(self):
572
"D-Bus method"
573
return dbus.Dictionary({
574
dbus.String(u"name"):
575
dbus.String(self.name, variant_level=1),
576
dbus.String(u"fingerprint"):
577
dbus.String(self.fingerprint, variant_level=1),
578
dbus.String(u"host"):
579
dbus.String(self.host, variant_level=1),
580
dbus.String(u"created"):
581
_datetime_to_dbus(self.created, variant_level=1),
582
dbus.String(u"last_enabled"):
583
(_datetime_to_dbus(self.last_enabled,
584
variant_level=1)
585
if self.last_enabled is not None
586
else dbus.Boolean(False, variant_level=1)),
587
dbus.String(u"enabled"):
588
dbus.Boolean(self.enabled, variant_level=1),
589
dbus.String(u"last_checked_ok"):
590
(_datetime_to_dbus(self.last_checked_ok,
591
variant_level=1)
592
if self.last_checked_ok is not None
593
else dbus.Boolean (False, variant_level=1)),
594
dbus.String(u"timeout"):
595
dbus.UInt64(self.timeout_milliseconds(),
596
variant_level=1),
597
dbus.String(u"interval"):
598
dbus.UInt64(self.interval_milliseconds(),
599
variant_level=1),
600
dbus.String(u"checker"):
601
dbus.String(self.checker_command,
602
variant_level=1),
603
dbus.String(u"checker_running"):
604
dbus.Boolean(self.checker is not None,
605
variant_level=1),
606
dbus.String(u"object_path"):
607
dbus.ObjectPath(self.dbus_object_path,
608
variant_level=1)
609
}, signature=u"sv")
610
611
# IsStillValid - method
612
@dbus.service.method(_interface, out_signature=u"b")
613
def IsStillValid(self):
614
return self.still_valid()
615
616
# PropertyChanged - signal
617
@dbus.service.signal(_interface, signature=u"sv")
618
def PropertyChanged(self, property, value):
619
"D-Bus signal"
620
pass
621
622
# ReceivedSecret - signal
623
@dbus.service.signal(_interface)
624
def ReceivedSecret(self):
625
"D-Bus signal"
626
pass
627
628
# Rejected - signal
629
@dbus.service.signal(_interface)
630
def Rejected(self):
631
"D-Bus signal"
632
pass
633
634
# SetChecker - method
635
@dbus.service.method(_interface, in_signature=u"s")
636
def SetChecker(self, checker):
637
"D-Bus setter method"
638
self.checker_command = checker
639
# Emit D-Bus signal
640
self.PropertyChanged(dbus.String(u"checker"),
641
dbus.String(self.checker_command,
642
variant_level=1))
643
644
# SetHost - method
645
@dbus.service.method(_interface, in_signature=u"s")
646
def SetHost(self, host):
647
"D-Bus setter method"
648
self.host = host
649
# Emit D-Bus signal
650
self.PropertyChanged(dbus.String(u"host"),
651
dbus.String(self.host, variant_level=1))
652
653
# SetInterval - method
654
@dbus.service.method(_interface, in_signature=u"t")
655
def SetInterval(self, milliseconds):
656
self.interval = datetime.timedelta(0, 0, 0, milliseconds)
657
# Emit D-Bus signal
658
self.PropertyChanged(dbus.String(u"interval"),
659
(dbus.UInt64(self.interval_milliseconds(),
660
variant_level=1)))
661
662
# SetSecret - method
663
@dbus.service.method(_interface, in_signature=u"ay",
664
byte_arrays=True)
665
def SetSecret(self, secret):
666
"D-Bus setter method"
667
self.secret = str(secret)
668
669
# SetTimeout - method
670
@dbus.service.method(_interface, in_signature=u"t")
671
def SetTimeout(self, milliseconds):
672
self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
673
# Emit D-Bus signal
674
self.PropertyChanged(dbus.String(u"timeout"),
675
(dbus.UInt64(self.timeout_milliseconds(),
676
variant_level=1)))
677
678
# Enable - method
679
@dbus.service.method(_interface)
680
def Enable(self):
681
"D-Bus method"
682
self.enable()
683
684
# StartChecker - method
685
@dbus.service.method(_interface)
686
def StartChecker(self):
687
"D-Bus method"
688
self.start_checker()
689
690
# Disable - method
691
@dbus.service.method(_interface)
692
def Disable(self):
693
"D-Bus method"
694
self.disable()
695
696
# StopChecker - method
697
@dbus.service.method(_interface)
698
def StopChecker(self):
699
self.stop_checker()
700
701
del _interface
702
703
704
class ClientHandler(socketserver.BaseRequestHandler, object):
705
"""A class to handle client connections.
706
707
Instantiated once for each connection to handle it.
307
708
Note: This will run in its own forked process."""
308
709
309
710
def handle(self):
310
logger.debug(u"TCP connection from: %s",
311
unicode(self.client_address))
312
session = gnutls.connection.ClientSession(self.request,
313
gnutls.connection.\
314
X509Credentials())
315
316
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
317
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
318
# "+DHE-DSS"))
319
priority = "SECURE256"
320
321
gnutls.library.functions.gnutls_priority_set_direct\
322
(session._c_object, priority, None);
323
324
try:
325
session.handshake()
326
except gnutls.errors.GNUTLSError, error:
327
logger.debug(u"Handshake failed: %s", error)
328
# Do not run session.bye() here: the session is not
329
# established. Just abandon the request.
330
return
331
try:
332
fpr = fingerprint(peer_certificate(session))
333
except (TypeError, gnutls.errors.GNUTLSError), error:
334
logger.debug(u"Bad certificate: %s", error)
335
session.bye()
336
return
337
logger.debug(u"Fingerprint: %s", fpr)
338
client = None
339
for c in clients:
340
if c.fingerprint == fpr:
341
client = c
342
break
343
# Have to check if client.still_valid(), since it is possible
344
# that the client timed out while establishing the GnuTLS
345
# session.
346
if (not client) or (not client.still_valid()):
347
if client:
348
logger.debug(u"Client %(name)s is invalid",
349
vars(client))
711
logger.info(u"TCP connection from: %s",
712
unicode(self.client_address))
713
logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
714
# Open IPC pipe to parent process
715
with closing(os.fdopen(self.server.pipe[1], u"w", 1)) as ipc:
716
session = (gnutls.connection
717
.ClientSession(self.request,
718
gnutls.connection
719
.X509Credentials()))
720
721
line = self.request.makefile().readline()
722
logger.debug(u"Protocol version: %r", line)
723
try:
724
if int(line.strip().split()[0]) > 1:
725
raise RuntimeError
726
except (ValueError, IndexError, RuntimeError), error:
727
logger.error(u"Unknown protocol version: %s", error)
728
return
729
730
# Note: gnutls.connection.X509Credentials is really a
731
# generic GnuTLS certificate credentials object so long as
732
# no X.509 keys are added to it. Therefore, we can use it
733
# here despite using OpenPGP certificates.
734
735
#priority = u':'.join((u"NONE", u"+VERS-TLS1.1",
736
# u"+AES-256-CBC", u"+SHA1",
737
# u"+COMP-NULL", u"+CTYPE-OPENPGP",
738
# u"+DHE-DSS"))
739
# Use a fallback default, since this MUST be set.
740
priority = self.server.gnutls_priority
741
if priority is None:
742
priority = u"NORMAL"
743
(gnutls.library.functions
744
.gnutls_priority_set_direct(session._c_object,
745
priority, None))
746
747
try:
748
session.handshake()
749
except gnutls.errors.GNUTLSError, error:
750
logger.warning(u"Handshake failed: %s", error)
751
# Do not run session.bye() here: the session is not
752
# established. Just abandon the request.
753
return
754
logger.debug(u"Handshake succeeded")
755
try:
756
fpr = self.fingerprint(self.peer_certificate(session))
757
except (TypeError, gnutls.errors.GNUTLSError), error:
758
logger.warning(u"Bad certificate: %s", error)
759
session.bye()
760
return
761
logger.debug(u"Fingerprint: %s", fpr)
762
763
for c in self.server.clients:
764
if c.fingerprint == fpr:
765
client = c
766
break
350
767
else:
351
logger.debug(u"Client not found for fingerprint: %s",
352
fpr)
768
ipc.write(u"NOTFOUND %s\n" % fpr)
769
session.bye()
770
return
771
# Have to check if client.still_valid(), since it is
772
# possible that the client timed out while establishing
773
# the GnuTLS session.
774
if not client.still_valid():
775
ipc.write(u"INVALID %s\n" % client.name)
776
session.bye()
777
return
778
ipc.write(u"SENDING %s\n" % client.name)
779
sent_size = 0
780
while sent_size < len(client.secret):
781
sent = session.send(client.secret[sent_size:])
782
logger.debug(u"Sent: %d, remaining: %d",
783
sent, len(client.secret)
784
- (sent_size + sent))
785
sent_size += sent
353
786
session.bye()
354
return
355
sent_size = 0
356
while sent_size < len(client.secret):
357
sent = session.send(client.secret[sent_size:])
358
logger.debug(u"Sent: %d, remaining: %d",
359
sent, len(client.secret)
360
- (sent_size + sent))
361
sent_size += sent
362
session.bye()
363
364
365
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
366
"""IPv6 TCP server. Accepts 'None' as address and/or port.
787
788
@staticmethod
789
def peer_certificate(session):
790
"Return the peer's OpenPGP certificate as a bytestring"
791
# If not an OpenPGP certificate...
792
if (gnutls.library.functions
793
.gnutls_certificate_type_get(session._c_object)
794
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
795
# ...do the normal thing
796
return session.peer_certificate
797
list_size = ctypes.c_uint(1)
798
cert_list = (gnutls.library.functions
799
.gnutls_certificate_get_peers
800
(session._c_object, ctypes.byref(list_size)))
801
if not bool(cert_list) and list_size.value != 0:
802
raise gnutls.errors.GNUTLSError(u"error getting peer"
803
u" certificate")
804
if list_size.value == 0:
805
return None
806
cert = cert_list[0]
807
return ctypes.string_at(cert.data, cert.size)
808
809
@staticmethod
810
def fingerprint(openpgp):
811
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
812
# New GnuTLS "datum" with the OpenPGP public key
813
datum = (gnutls.library.types
814
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
815
ctypes.POINTER
816
(ctypes.c_ubyte)),
817
ctypes.c_uint(len(openpgp))))
818
# New empty GnuTLS certificate
819
crt = gnutls.library.types.gnutls_openpgp_crt_t()
820
(gnutls.library.functions
821
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
822
# Import the OpenPGP public key into the certificate
823
(gnutls.library.functions
824
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
825
gnutls.library.constants
826
.GNUTLS_OPENPGP_FMT_RAW))
827
# Verify the self signature in the key
828
crtverify = ctypes.c_uint()
829
(gnutls.library.functions
830
.gnutls_openpgp_crt_verify_self(crt, 0,
831
ctypes.byref(crtverify)))
832
if crtverify.value != 0:
833
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
834
raise (gnutls.errors.CertificateSecurityError
835
(u"Verify failed"))
836
# New buffer for the fingerprint
837
buf = ctypes.create_string_buffer(20)
838
buf_len = ctypes.c_size_t()
839
# Get the fingerprint from the certificate into the buffer
840
(gnutls.library.functions
841
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
842
ctypes.byref(buf_len)))
843
# Deinit the certificate
844
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
845
# Convert the buffer to a Python bytestring
846
fpr = ctypes.string_at(buf, buf_len.value)
847
# Convert the bytestring to hexadecimal notation
848
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
849
return hex_fpr
850
851
852
class ForkingMixInWithPipe(socketserver.ForkingMixIn, object):
853
"""Like socketserver.ForkingMixIn, but also pass a pipe.
854
855
Assumes a gobject.MainLoop event loop.
856
"""
857
def process_request(self, request, client_address):
858
"""Overrides and wraps the original process_request().
859
860
This function creates a new pipe in self.pipe
861
"""
862
self.pipe = os.pipe()
863
super(ForkingMixInWithPipe,
864
self).process_request(request, client_address)
865
os.close(self.pipe[1]) # close write end
866
# Call "handle_ipc" for both data and EOF events
867
gobject.io_add_watch(self.pipe[0],
868
gobject.IO_IN | gobject.IO_HUP,
869
self.handle_ipc)
870
def handle_ipc(source, condition):
871
"""Dummy function; override as necessary"""
872
os.close(source)
873
return False
874
875
876
class IPv6_TCPServer(ForkingMixInWithPipe,
877
socketserver.TCPServer, object):
878
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
879
367
880
Attributes:
368
options: Command line options
369
clients: Set() of Client objects
881
enabled: Boolean; whether this server is activated yet
882
interface: None or a network interface name (string)
883
use_ipv6: Boolean; to use IPv6 or not
884
----
885
clients: set of Client objects
886
gnutls_priority GnuTLS priority string
887
use_dbus: Boolean; to emit D-Bus signals or not
370
888
"""
371
address_family = socket.AF_INET6
372
def __init__(self, *args, **kwargs):
373
if "options" in kwargs:
374
self.options = kwargs["options"]
375
del kwargs["options"]
376
if "clients" in kwargs:
377
self.clients = kwargs["clients"]
378
del kwargs["clients"]
379
return super(type(self), self).__init__(*args, **kwargs)
889
def __init__(self, server_address, RequestHandlerClass,
890
interface=None, use_ipv6=True, clients=None,
891
gnutls_priority=None, use_dbus=True):
892
self.enabled = False
893
self.interface = interface
894
if use_ipv6:
895
self.address_family = socket.AF_INET6
896
self.clients = clients
897
self.use_dbus = use_dbus
898
self.gnutls_priority = gnutls_priority
899
socketserver.TCPServer.__init__(self, server_address,
900
RequestHandlerClass)
380
901
def server_bind(self):
381
902
"""This overrides the normal server_bind() function
382
903
to bind to an interface if one was specified, and also NOT to
383
904
bind to an address or port if they were not specified."""
384
if self.options.interface:
385
if not hasattr(socket, "SO_BINDTODEVICE"):
386
# From /usr/include/asm-i486/socket.h
387
socket.SO_BINDTODEVICE = 25
905
if self.interface is not None:
388
906
try:
389
907
self.socket.setsockopt(socket.SOL_SOCKET,
390
socket.SO_BINDTODEVICE,
391
self.options.interface)
908
SO_BINDTODEVICE,
909
str(self.interface + u'\0'))
392
910
except socket.error, error:
393
911
if error[0] == errno.EPERM:
394
logger.warning(u"No permission to"
395
u" bind to interface %s",
396
self.options.interface)
912
logger.error(u"No permission to"
913
u" bind to interface %s",
914
self.interface)
397
915
else:
398
raise error
916
raise
399
917
# Only bind(2) the socket if we really need to.
400
918
if self.server_address[0] or self.server_address[1]:
401
919
if not self.server_address[0]:
402
in6addr_any = "::"
403
self.server_address = (in6addr_any,
920
if self.address_family == socket.AF_INET6:
921
any_address = u"::" # in6addr_any
922
else:
923
any_address = socket.INADDR_ANY
924
self.server_address = (any_address,
404
925
self.server_address[1])
405
elif self.server_address[1] is None:
926
elif not self.server_address[1]:
406
927
self.server_address = (self.server_address[0],
407
928
0)
408
return super(type(self), self).server_bind()
929
# if self.interface:
930
# self.server_address = (self.server_address[0],
931
# 0, # port
932
# 0, # flowinfo
933
# if_nametoindex
934
# (self.interface))
935
return socketserver.TCPServer.server_bind(self)
936
def server_activate(self):
937
if self.enabled:
938
return socketserver.TCPServer.server_activate(self)
939
def enable(self):
940
self.enabled = True
941
def handle_ipc(self, source, condition, file_objects={}):
942
condition_names = {
943
gobject.IO_IN: u"IN", # There is data to read.
944
gobject.IO_OUT: u"OUT", # Data can be written (without
945
# blocking).
946
gobject.IO_PRI: u"PRI", # There is urgent data to read.
947
gobject.IO_ERR: u"ERR", # Error condition.
948
gobject.IO_HUP: u"HUP" # Hung up (the connection has been
949
# broken, usually for pipes and
950
# sockets).
951
}
952
conditions_string = ' | '.join(name
953
for cond, name in
954
condition_names.iteritems()
955
if cond & condition)
956
logger.debug(u"Handling IPC: FD = %d, condition = %s", source,
957
conditions_string)
958
959
# Turn the pipe file descriptor into a Python file object
960
if source not in file_objects:
961
file_objects[source] = os.fdopen(source, u"r", 1)
962
963
# Read a line from the file object
964
cmdline = file_objects[source].readline()
965
if not cmdline: # Empty line means end of file
966
# close the IPC pipe
967
file_objects[source].close()
968
del file_objects[source]
969
970
# Stop calling this function
971
return False
972
973
logger.debug(u"IPC command: %r", cmdline)
974
975
# Parse and act on command
976
cmd, args = cmdline.rstrip(u"\r\n").split(None, 1)
977
978
if cmd == u"NOTFOUND":
979
logger.warning(u"Client not found for fingerprint: %s",
980
args)
981
if self.use_dbus:
982
# Emit D-Bus signal
983
mandos_dbus_service.ClientNotFound(args)
984
elif cmd == u"INVALID":
985
for client in self.clients:
986
if client.name == args:
987
logger.warning(u"Client %s is invalid", args)
988
if self.use_dbus:
989
# Emit D-Bus signal
990
client.Rejected()
991
break
992
else:
993
logger.error(u"Unknown client %s is invalid", args)
994
elif cmd == u"SENDING":
995
for client in self.clients:
996
if client.name == args:
997
logger.info(u"Sending secret to %s", client.name)
998
client.checked_ok()
999
if self.use_dbus:
1000
# Emit D-Bus signal
1001
client.ReceivedSecret()
1002
break
1003
else:
1004
logger.error(u"Sending secret to unknown client %s",
1005
args)
1006
else:
1007
logger.error(u"Unknown IPC command: %r", cmdline)
1008
1009
# Keep calling this function
1010
return True
409
1011
410
1012
411
1013
def string_to_delta(interval):
412
1014
"""Parse a string and return a datetime.timedelta
413
414
>>> string_to_delta('7d')
1015
1016
>>> string_to_delta(u'7d')
415
1017
datetime.timedelta(7)
416
>>> string_to_delta('60s')
1018
>>> string_to_delta(u'60s')
417
1019
datetime.timedelta(0, 60)
418
>>> string_to_delta('60m')
1020
>>> string_to_delta(u'60m')
419
1021
datetime.timedelta(0, 3600)
420
>>> string_to_delta('24h')
1022
>>> string_to_delta(u'24h')
421
1023
datetime.timedelta(1)
422
1024
>>> string_to_delta(u'1w')
423
1025
datetime.timedelta(7)
1026
>>> string_to_delta(u'5m 30s')
1027
datetime.timedelta(0, 330)
424
1028
"""
425
try:
426
suffix=unicode(interval[-1])
427
value=int(interval[:-1])
428
if suffix == u"d":
429
delta = datetime.timedelta(value)
430
elif suffix == u"s":
431
delta = datetime.timedelta(0, value)
432
elif suffix == u"m":
433
delta = datetime.timedelta(0, 0, 0, 0, value)
434
elif suffix == u"h":
435
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
436
elif suffix == u"w":
437
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
438
else:
1029
timevalue = datetime.timedelta(0)
1030
for s in interval.split():
1031
try:
1032
suffix = unicode(s[-1])
1033
value = int(s[:-1])
1034
if suffix == u"d":
1035
delta = datetime.timedelta(value)
1036
elif suffix == u"s":
1037
delta = datetime.timedelta(0, value)
1038
elif suffix == u"m":
1039
delta = datetime.timedelta(0, 0, 0, 0, value)
1040
elif suffix == u"h":
1041
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1042
elif suffix == u"w":
1043
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1044
else:
1045
raise ValueError
1046
except (ValueError, IndexError):
439
1047
raise ValueError
440
except (ValueError, IndexError):
441
raise ValueError
442
return delta
443
444
445
def add_service():
446
"""From the Avahi server example code"""
447
global group, serviceName, serviceType, servicePort, serviceTXT, \
448
domain, host
449
if group is None:
450
group = dbus.Interface(
451
bus.get_object( avahi.DBUS_NAME,
452
server.EntryGroupNew()),
453
avahi.DBUS_INTERFACE_ENTRY_GROUP)
454
group.connect_to_signal('StateChanged',
455
entry_group_state_changed)
456
logger.debug(u"Adding service '%s' of type '%s' ...",
457
serviceName, serviceType)
458
459
group.AddService(
460
serviceInterface, # interface
461
avahi.PROTO_INET6, # protocol
462
dbus.UInt32(0), # flags
463
serviceName, serviceType,
464
domain, host,
465
dbus.UInt16(servicePort),
466
avahi.string_array_to_txt_array(serviceTXT))
467
group.Commit()
468
469
470
def remove_service():
471
"""From the Avahi server example code"""
472
global group
473
474
if not group is None:
475
group.Reset()
1048
timevalue += delta
1049
return timevalue
476
1050
477
1051
478
1052
def server_state_changed(state):
479
"""From the Avahi server example code"""
1053
"""Derived from the Avahi example code"""
480
1054
if state == avahi.SERVER_COLLISION:
481
logger.warning(u"Server name collision")
482
remove_service()
1055
logger.error(u"Zeroconf server name collision")
1056
service.remove()
483
1057
elif state == avahi.SERVER_RUNNING:
484
add_service()
1058
service.add()
485
1059
486
1060
487
1061
def entry_group_state_changed(state, error):
488
"""From the Avahi server example code"""
489
global serviceName, server, rename_count
490
491
logger.debug(u"state change: %i", state)
1062
"""Derived from the Avahi example code"""
1063
logger.debug(u"Avahi state change: %i", state)
492
1064
493
1065
if state == avahi.ENTRY_GROUP_ESTABLISHED:
494
logger.debug(u"Service established.")
1066
logger.debug(u"Zeroconf service established.")
495
1067
elif state == avahi.ENTRY_GROUP_COLLISION:
496
497
rename_count = rename_count - 1
498
if rename_count > 0:
499
name = server.GetAlternativeServiceName(name)
500
logger.warning(u"Service name collision, "
501
u"changing name to '%s' ...", name)
502
remove_service()
503
add_service()
504
505
else:
506
logger.error(u"No suitable service name found "
507
u"after %i retries, exiting.",
508
n_rename)
509
main_loop.quit()
1068
logger.warning(u"Zeroconf service name collision.")
1069
service.rename()
510
1070
elif state == avahi.ENTRY_GROUP_FAILURE:
511
logger.error(u"Error in group state changed %s",
512
unicode(error))
513
main_loop.quit()
514
return
515
1071
logger.critical(u"Avahi: Error in group state changed %s",
1072
unicode(error))
1073
raise AvahiGroupError(u"State changed: %s" % unicode(error))
516
1074
517
1075
def if_nametoindex(interface):
518
"""Call the C function if_nametoindex()"""
1076
"""Call the C function if_nametoindex(), or equivalent
1077
1078
Note: This function cannot accept a unicode string."""
1079
global if_nametoindex
519
1080
try:
520
libc = ctypes.cdll.LoadLibrary("libc.so.6")
521
return libc.if_nametoindex(interface)
1081
if_nametoindex = (ctypes.cdll.LoadLibrary
1082
(ctypes.util.find_library(u"c"))
1083
.if_nametoindex)
522
1084
except (OSError, AttributeError):
523
if "struct" not in sys.modules:
524
import struct
525
if "fcntl" not in sys.modules:
526
import fcntl
527
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
528
s = socket.socket()
529
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
530
struct.pack("16s16x", interface))
531
s.close()
532
interface_index = struct.unpack("I", ifreq[16:20])[0]
533
return interface_index
534
535
536
if __name__ == '__main__':
537
parser = OptionParser()
538
parser.add_option("-i", "--interface", type="string",
539
default=None, metavar="IF",
540
help="Bind to interface IF")
541
parser.add_option("--cert", type="string", default="cert.pem",
542
metavar="FILE",
543
help="Public key certificate PEM file to use")
544
parser.add_option("--key", type="string", default="key.pem",
545
metavar="FILE",
546
help="Private key PEM file to use")
547
parser.add_option("--ca", type="string", default="ca.pem",
548
metavar="FILE",
549
help="Certificate Authority certificate PEM file to use")
550
parser.add_option("--crl", type="string", default="crl.pem",
551
metavar="FILE",
552
help="Certificate Revokation List PEM file to use")
553
parser.add_option("-p", "--port", type="int", default=None,
554
help="Port number to receive requests on")
555
parser.add_option("--timeout", type="string", # Parsed later
556
default="1h",
557
help="Amount of downtime allowed for clients")
558
parser.add_option("--interval", type="string", # Parsed later
559
default="5m",
560
help="How often to check that a client is up")
561
parser.add_option("--check", action="store_true", default=False,
562
help="Run self-test")
563
parser.add_option("--debug", action="store_true", default=False,
564
help="Debug mode")
565
(options, args) = parser.parse_args()
1085
logger.warning(u"Doing if_nametoindex the hard way")
1086
def if_nametoindex(interface):
1087
"Get an interface index the hard way, i.e. using fcntl()"
1088
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1089
with closing(socket.socket()) as s:
1090
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1091
struct.pack(str(u"16s16x"),
1092
interface))
1093
interface_index = struct.unpack(str(u"I"),
1094
ifreq[16:20])[0]
1095
return interface_index
1096
return if_nametoindex(interface)
1097
1098
1099
def daemon(nochdir = False, noclose = False):
1100
"""See daemon(3). Standard BSD Unix function.
1101
1102
This should really exist as os.daemon, but it doesn't (yet)."""
1103
if os.fork():
1104
sys.exit()
1105
os.setsid()
1106
if not nochdir:
1107
os.chdir(u"/")
1108
if os.fork():
1109
sys.exit()
1110
if not noclose:
1111
# Close all standard open file descriptors
1112
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1113
if not stat.S_ISCHR(os.fstat(null).st_mode):
1114
raise OSError(errno.ENODEV,
1115
u"/dev/null not a character device")
1116
os.dup2(null, sys.stdin.fileno())
1117
os.dup2(null, sys.stdout.fileno())
1118
os.dup2(null, sys.stderr.fileno())
1119
if null > 2:
1120
os.close(null)
1121
1122
1123
def main():
1124
1125
######################################################################
1126
# Parsing of options, both command line and config file
1127
1128
parser = optparse.OptionParser(version = "%%prog %s" % version)
1129
parser.add_option("-i", u"--interface", type=u"string",
1130
metavar="IF", help=u"Bind to interface IF")
1131
parser.add_option("-a", u"--address", type=u"string",
1132
help=u"Address to listen for requests on")
1133
parser.add_option("-p", u"--port", type=u"int",
1134
help=u"Port number to receive requests on")
1135
parser.add_option("--check", action=u"store_true",
1136
help=u"Run self-test")
1137
parser.add_option("--debug", action=u"store_true",
1138
help=u"Debug mode; run in foreground and log to"
1139
u" terminal")
1140
parser.add_option("--priority", type=u"string", help=u"GnuTLS"
1141
u" priority string (see GnuTLS documentation)")
1142
parser.add_option("--servicename", type=u"string",
1143
metavar=u"NAME", help=u"Zeroconf service name")
1144
parser.add_option("--configdir", type=u"string",
1145
default=u"/etc/mandos", metavar=u"DIR",
1146
help=u"Directory to search for configuration"
1147
u" files")
1148
parser.add_option("--no-dbus", action=u"store_false",
1149
dest=u"use_dbus", help=u"Do not provide D-Bus"
1150
u" system bus interface")
1151
parser.add_option("--no-ipv6", action=u"store_false",
1152
dest=u"use_ipv6", help=u"Do not use IPv6")
1153
options = parser.parse_args()[0]
566
1154
567
1155
if options.check:
568
1156
import doctest
569
1157
doctest.testmod()
570
1158
sys.exit()
571
1159
572
# Parse the time arguments
573
try:
574
options.timeout = string_to_delta(options.timeout)
575
except ValueError:
576
parser.error("option --timeout: Unparseable time")
577
try:
578
options.interval = string_to_delta(options.interval)
579
except ValueError:
580
parser.error("option --interval: Unparseable time")
581
582
# Parse config file
583
defaults = { "checker": "sleep 1; fping -q -- %%(fqdn)s" }
584
client_config = ConfigParser.SafeConfigParser(defaults)
585
#client_config.readfp(open("secrets.conf"), "secrets.conf")
586
client_config.read("mandos-clients.conf")
587
588
# From the Avahi server example code
1160
# Default values for config file for server-global settings
1161
server_defaults = { u"interface": u"",
1162
u"address": u"",
1163
u"port": u"",
1164
u"debug": u"False",
1165
u"priority":
1166
u"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1167
u"servicename": u"Mandos",
1168
u"use_dbus": u"True",
1169
u"use_ipv6": u"True",
1170
}
1171
1172
# Parse config file for server-global settings
1173
server_config = configparser.SafeConfigParser(server_defaults)
1174
del server_defaults
1175
server_config.read(os.path.join(options.configdir,
1176
u"mandos.conf"))
1177
# Convert the SafeConfigParser object to a dict
1178
server_settings = server_config.defaults()
1179
# Use the appropriate methods on the non-string config options
1180
for option in (u"debug", u"use_dbus", u"use_ipv6"):
1181
server_settings[option] = server_config.getboolean(u"DEFAULT",
1182
option)
1183
if server_settings["port"]:
1184
server_settings["port"] = server_config.getint(u"DEFAULT",
1185
u"port")
1186
del server_config
1187
1188
# Override the settings from the config file with command line
1189
# options, if set.
1190
for option in (u"interface", u"address", u"port", u"debug",
1191
u"priority", u"servicename", u"configdir",
1192
u"use_dbus", u"use_ipv6"):
1193
value = getattr(options, option)
1194
if value is not None:
1195
server_settings[option] = value
1196
del options
1197
# Force all strings to be unicode
1198
for option in server_settings.keys():
1199
if type(server_settings[option]) is str:
1200
server_settings[option] = unicode(server_settings[option])
1201
# Now we have our good server settings in "server_settings"
1202
1203
##################################################################
1204
1205
# For convenience
1206
debug = server_settings[u"debug"]
1207
use_dbus = server_settings[u"use_dbus"]
1208
use_ipv6 = server_settings[u"use_ipv6"]
1209
1210
if not debug:
1211
syslogger.setLevel(logging.WARNING)
1212
console.setLevel(logging.WARNING)
1213
1214
if server_settings[u"servicename"] != u"Mandos":
1215
syslogger.setFormatter(logging.Formatter
1216
(u'Mandos (%s) [%%(process)d]:'
1217
u' %%(levelname)s: %%(message)s'
1218
% server_settings[u"servicename"]))
1219
1220
# Parse config file with clients
1221
client_defaults = { u"timeout": u"1h",
1222
u"interval": u"5m",
1223
u"checker": u"fping -q -- %%(host)s",
1224
u"host": u"",
1225
}
1226
client_config = configparser.SafeConfigParser(client_defaults)
1227
client_config.read(os.path.join(server_settings[u"configdir"],
1228
u"clients.conf"))
1229
1230
global mandos_dbus_service
1231
mandos_dbus_service = None
1232
1233
clients = set()
1234
tcp_server = IPv6_TCPServer((server_settings[u"address"],
1235
server_settings[u"port"]),
1236
ClientHandler,
1237
interface=
1238
server_settings[u"interface"],
1239
use_ipv6=use_ipv6,
1240
clients=clients,
1241
gnutls_priority=
1242
server_settings[u"priority"],
1243
use_dbus=use_dbus)
1244
pidfilename = u"/var/run/mandos.pid"
1245
try:
1246
pidfile = open(pidfilename, u"w")
1247
except IOError:
1248
logger.error(u"Could not open file %r", pidfilename)
1249
1250
try:
1251
uid = pwd.getpwnam(u"_mandos").pw_uid
1252
gid = pwd.getpwnam(u"_mandos").pw_gid
1253
except KeyError:
1254
try:
1255
uid = pwd.getpwnam(u"mandos").pw_uid
1256
gid = pwd.getpwnam(u"mandos").pw_gid
1257
except KeyError:
1258
try:
1259
uid = pwd.getpwnam(u"nobody").pw_uid
1260
gid = pwd.getpwnam(u"nobody").pw_gid
1261
except KeyError:
1262
uid = 65534
1263
gid = 65534
1264
try:
1265
os.setgid(gid)
1266
os.setuid(uid)
1267
except OSError, error:
1268
if error[0] != errno.EPERM:
1269
raise error
1270
1271
# Enable all possible GnuTLS debugging
1272
if debug:
1273
# "Use a log level over 10 to enable all debugging options."
1274
# - GnuTLS manual
1275
gnutls.library.functions.gnutls_global_set_log_level(11)
1276
1277
@gnutls.library.types.gnutls_log_func
1278
def debug_gnutls(level, string):
1279
logger.debug(u"GnuTLS: %s", string[:-1])
1280
1281
(gnutls.library.functions
1282
.gnutls_global_set_log_function(debug_gnutls))
1283
1284
global service
1285
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1286
service = AvahiService(name = server_settings[u"servicename"],
1287
servicetype = u"_mandos._tcp",
1288
protocol = protocol)
1289
if server_settings["interface"]:
1290
service.interface = (if_nametoindex
1291
(str(server_settings[u"interface"])))
1292
1293
global main_loop
1294
global bus
1295
global server
1296
# From the Avahi example code
589
1297
DBusGMainLoop(set_as_default=True )
590
1298
main_loop = gobject.MainLoop()
591
1299
bus = dbus.SystemBus()
592
server = dbus.Interface(
593
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
594
avahi.DBUS_INTERFACE_SERVER )
1300
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1301
avahi.DBUS_PATH_SERVER),
1302
avahi.DBUS_INTERFACE_SERVER)
595
1303
# End of Avahi example code
596
597
debug = options.debug
598
599
clients = Set()
600
def remove_from_clients(client):
601
clients.remove(client)
602
if not clients:
603
logger.debug(u"No clients left, exiting")
604
main_loop.quit()
605
606
clients.update(Set(Client(name=section, options=options,
607
stop_hook = remove_from_clients,
608
**(dict(client_config\
609
.items(section))))
610
for section in client_config.sections()))
1304
if use_dbus:
1305
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1306
1307
client_class = Client
1308
if use_dbus:
1309
client_class = ClientDBus
1310
clients.update(set(
1311
client_class(name = section,
1312
config= dict(client_config.items(section)))
1313
for section in client_config.sections()))
1314
if not clients:
1315
logger.warning(u"No clients defined")
1316
1317
if debug:
1318
# Redirect stdin so all checkers get /dev/null
1319
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1320
os.dup2(null, sys.stdin.fileno())
1321
if null > 2:
1322
os.close(null)
1323
else:
1324
# No console logging
1325
logger.removeHandler(console)
1326
# Close all input and output, do double fork, etc.
1327
daemon()
1328
1329
try:
1330
with closing(pidfile):
1331
pid = os.getpid()
1332
pidfile.write(str(pid) + "\n")
1333
del pidfile
1334
except IOError:
1335
logger.error(u"Could not write to file %r with PID %d",
1336
pidfilename, pid)
1337
except NameError:
1338
# "pidfile" was never created
1339
pass
1340
del pidfilename
1341
1342
def cleanup():
1343
"Cleanup function; run on exit"
1344
global group
1345
# From the Avahi example code
1346
if not group is None:
1347
group.Free()
1348
group = None
1349
# End of Avahi example code
1350
1351
while clients:
1352
client = clients.pop()
1353
client.disable_hook = None
1354
client.disable()
1355
1356
atexit.register(cleanup)
1357
1358
if not debug:
1359
signal.signal(signal.SIGINT, signal.SIG_IGN)
1360
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1361
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1362
1363
if use_dbus:
1364
class MandosDBusService(dbus.service.Object):
1365
"""A D-Bus proxy object"""
1366
def __init__(self):
1367
dbus.service.Object.__init__(self, bus, u"/")
1368
_interface = u"se.bsnet.fukt.Mandos"
1369
1370
@dbus.service.signal(_interface, signature=u"oa{sv}")
1371
def ClientAdded(self, objpath, properties):
1372
"D-Bus signal"
1373
pass
1374
1375
@dbus.service.signal(_interface, signature=u"s")
1376
def ClientNotFound(self, fingerprint):
1377
"D-Bus signal"
1378
pass
1379
1380
@dbus.service.signal(_interface, signature=u"os")
1381
def ClientRemoved(self, objpath, name):
1382
"D-Bus signal"
1383
pass
1384
1385
@dbus.service.method(_interface, out_signature=u"ao")
1386
def GetAllClients(self):
1387
"D-Bus method"
1388
return dbus.Array(c.dbus_object_path for c in clients)
1389
1390
@dbus.service.method(_interface,
1391
out_signature=u"a{oa{sv}}")
1392
def GetAllClientsWithProperties(self):
1393
"D-Bus method"
1394
return dbus.Dictionary(
1395
((c.dbus_object_path, c.GetAllProperties())
1396
for c in clients),
1397
signature=u"oa{sv}")
1398
1399
@dbus.service.method(_interface, in_signature=u"o")
1400
def RemoveClient(self, object_path):
1401
"D-Bus method"
1402
for c in clients:
1403
if c.dbus_object_path == object_path:
1404
clients.remove(c)
1405
c.remove_from_connection()
1406
# Don't signal anything except ClientRemoved
1407
c.disable(signal=False)
1408
# Emit D-Bus signal
1409
self.ClientRemoved(object_path, c.name)
1410
return
1411
raise KeyError
1412
1413
del _interface
1414
1415
mandos_dbus_service = MandosDBusService()
1416
611
1417
for client in clients:
612
client.start()
613
614
tcp_server = IPv6_TCPServer((None, options.port),
615
tcp_handler,
616
options=options,
617
clients=clients)
618
# Find out what random port we got
619
servicePort = tcp_server.socket.getsockname()[1]
620
logger.debug(u"Now listening on port %d", servicePort)
621
622
if options.interface is not None:
623
serviceInterface = if_nametoindex(options.interface)
624
625
# From the Avahi server example code
626
server.connect_to_signal("StateChanged", server_state_changed)
627
server_state_changed(server.GetState())
628
# End of Avahi example code
629
630
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
631
lambda *args, **kwargs:
632
tcp_server.handle_request(*args[2:],
633
**kwargs) or True)
1418
if use_dbus:
1419
# Emit D-Bus signal
1420
mandos_dbus_service.ClientAdded(client.dbus_object_path,
1421
client.GetAllProperties())
1422
client.enable()
1423
1424
tcp_server.enable()
1425
tcp_server.server_activate()
1426
1427
# Find out what port we got
1428
service.port = tcp_server.socket.getsockname()[1]
1429
if use_ipv6:
1430
logger.info(u"Now listening on address %r, port %d,"
1431
" flowinfo %d, scope_id %d"
1432
% tcp_server.socket.getsockname())
1433
else: # IPv4
1434
logger.info(u"Now listening on address %r, port %d"
1435
% tcp_server.socket.getsockname())
1436
1437
#service.interface = tcp_server.socket.getsockname()[3]
1438
634
1439
try:
1440
# From the Avahi example code
1441
server.connect_to_signal(u"StateChanged", server_state_changed)
1442
try:
1443
server_state_changed(server.GetState())
1444
except dbus.exceptions.DBusException, error:
1445
logger.critical(u"DBusException: %s", error)
1446
sys.exit(1)
1447
# End of Avahi example code
1448
1449
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1450
lambda *args, **kwargs:
1451
(tcp_server.handle_request
1452
(*args[2:], **kwargs) or True))
1453
1454
logger.debug(u"Starting main loop")
635
1455
main_loop.run()
1456
except AvahiError, error:
1457
logger.critical(u"AvahiError: %s", error)
1458
sys.exit(1)
636
1459
except KeyboardInterrupt:
637
print
638
639
# Cleanup here
1460
if debug:
1461
print >> sys.stderr
1462
logger.debug(u"Server received KeyboardInterrupt")
1463
logger.debug(u"Server exiting")
640
1464
641
# From the Avahi server example code
642
if not group is None:
643
group.Free()
644
# End of Avahi example code
645
646
for client in clients:
647
client.stop_hook = None
648
client.stop()
1465
if __name__ == '__main__':
1466
main()
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Version: 2.0.2.dev0