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- Committer: Teddy Hogeborn
- Date: 2008-07-20 06:33:48 UTC
- Revision ID: teddy@fukt.bsnet.se-20080720063348-jscgy5p0itrgvlo8
* mandos-clients.conf ([foo]): Uncommented.
([foo]/secret): New.
([foo]/secfile): Commented out.
([foo]/checker): Changed to "fping -q -- %%(fqdn)s".
([foo]/timeout): New.
* server.py: New modeline for Python and Emacs. Set a logging format.
(Client.__init__): Bug fix: Choose either the value from the options
object or pass the argument through string_to_delta
for both "timeout" and "interval".
(Client.checker_callback): Bug fix: Do not log spurious "Checker for
<foo> failed" messages.
(Client.start_checker): Moved "Starting checker" log message down to
just before actually starting the subprocess.
Do not redirect the subprocesses' stdout to a
pipe.
(peer_certificate, fingerprint): Added docstrings.
(entry_group_state_changed): Call "killme()" instead of
"main_loop.quit()".
(daemon, killme): New functions.
(exitstatus, main_loop_started): New global variables.
(__main__): Removed the "--cert", "--key", "--ca", and "--crl"
options. Removed the sleep command from the default
checker. Add a console logger in debug mode. Call
"killme()" instead of "main_loop.quit()" when there are no
more clients. Call "daemon()" if not in debug mode.
Register "cleanup()" to run at exit. Ignore some
signals. Catch DBusException to detect another running
server and exit cleanly. Exit with "exitstatus".
(cleanup): New function.
([foo]/secret): New.
([foo]/secfile): Commented out.
([foo]/checker): Changed to "fping -q -- %%(fqdn)s".
([foo]/timeout): New.
* server.py: New modeline for Python and Emacs. Set a logging format.
(Client.__init__): Bug fix: Choose either the value from the options
object or pass the argument through string_to_delta
for both "timeout" and "interval".
(Client.checker_callback): Bug fix: Do not log spurious "Checker for
<foo> failed" messages.
(Client.start_checker): Moved "Starting checker" log message down to
just before actually starting the subprocess.
Do not redirect the subprocesses' stdout to a
pipe.
(peer_certificate, fingerprint): Added docstrings.
(entry_group_state_changed): Call "killme()" instead of
"main_loop.quit()".
(daemon, killme): New functions.
(exitstatus, main_loop_started): New global variables.
(__main__): Removed the "--cert", "--key", "--ca", and "--crl"
options. Removed the sleep command from the default
checker. Add a console logger in debug mode. Call
"killme()" instead of "main_loop.quit()" when there are no
more clients. Call "daemon()" if not in debug mode.
Register "cleanup()" to run at exit. Ignore some
signals. Catch DBusException to detect another running
server and exit cleanly. Exit with "exitstatus".
(cleanup): New function.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
1
1
#!/usr/bin/python
2
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
3
34
from __future__ import division, with_statement, absolute_import
4
from __future__ import division
35
5
36
6
import SocketServer
37
7
import socket
38
import optparse
8
import select
9
from optparse import OptionParser
39
10
import datetime
40
11
import errno
41
12
import gnutls.crypto
53
24
import subprocess
54
25
import atexit
55
26
import stat
56
import logging
57
import logging.handlers
58
import pwd
59
from contextlib import closing
60
27
61
28
import dbus
62
import dbus.service
63
29
import gobject
64
30
import avahi
65
31
from dbus.mainloop.glib import DBusGMainLoop
66
32
import ctypes
67
import ctypes.util
68
33
69
version = "1.0.8"
34
import logging
35
import logging.handlers
70
36
71
37
logger = logging.Logger('mandos')
72
syslogger = (logging.handlers.SysLogHandler
73
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
74
address = "/dev/log"))
75
syslogger.setFormatter(logging.Formatter
76
('Mandos [%(process)d]: %(levelname)s:'
77
' %(message)s'))
38
syslogger = logging.handlers.SysLogHandler\
39
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
40
syslogger.setFormatter(logging.Formatter\
41
('%(levelname)s: %(message)s'))
78
42
logger.addHandler(syslogger)
79
80
console = logging.StreamHandler()
81
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
82
' %(levelname)s: %(message)s'))
83
logger.addHandler(console)
84
85
class AvahiError(Exception):
86
def __init__(self, value, *args, **kwargs):
87
self.value = value
88
super(AvahiError, self).__init__(value, *args, **kwargs)
89
def __unicode__(self):
90
return unicode(repr(self.value))
91
92
class AvahiServiceError(AvahiError):
93
pass
94
95
class AvahiGroupError(AvahiError):
96
pass
97
98
99
class AvahiService(object):
100
"""An Avahi (Zeroconf) service.
101
Attributes:
102
interface: integer; avahi.IF_UNSPEC or an interface index.
103
Used to optionally bind to the specified interface.
104
name: string; Example: 'Mandos'
105
type: string; Example: '_mandos._tcp'.
106
See <http://www.dns-sd.org/ServiceTypes.html>
107
port: integer; what port to announce
108
TXT: list of strings; TXT record for the service
109
domain: string; Domain to publish on, default to .local if empty.
110
host: string; Host to publish records for, default is localhost
111
max_renames: integer; maximum number of renames
112
rename_count: integer; counter so we only rename after collisions
113
a sensible number of times
114
"""
115
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
116
servicetype = None, port = None, TXT = None,
117
domain = "", host = "", max_renames = 32768,
118
protocol = avahi.PROTO_UNSPEC):
119
self.interface = interface
120
self.name = name
121
self.type = servicetype
122
self.port = port
123
self.TXT = TXT if TXT is not None else []
124
self.domain = domain
125
self.host = host
126
self.rename_count = 0
127
self.max_renames = max_renames
128
self.protocol = protocol
129
def rename(self):
130
"""Derived from the Avahi example code"""
131
if self.rename_count >= self.max_renames:
132
logger.critical(u"No suitable Zeroconf service name found"
133
u" after %i retries, exiting.",
134
self.rename_count)
135
raise AvahiServiceError(u"Too many renames")
136
self.name = server.GetAlternativeServiceName(self.name)
137
logger.info(u"Changing Zeroconf service name to %r ...",
138
str(self.name))
139
syslogger.setFormatter(logging.Formatter
140
('Mandos (%s) [%%(process)d]:'
141
' %%(levelname)s: %%(message)s'
142
% self.name))
143
self.remove()
144
self.add()
145
self.rename_count += 1
146
def remove(self):
147
"""Derived from the Avahi example code"""
148
if group is not None:
149
group.Reset()
150
def add(self):
151
"""Derived from the Avahi example code"""
152
global group
153
if group is None:
154
group = dbus.Interface(bus.get_object
155
(avahi.DBUS_NAME,
156
server.EntryGroupNew()),
157
avahi.DBUS_INTERFACE_ENTRY_GROUP)
158
group.connect_to_signal('StateChanged',
159
entry_group_state_changed)
160
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
161
service.name, service.type)
162
group.AddService(
163
self.interface, # interface
164
self.protocol, # protocol
165
dbus.UInt32(0), # flags
166
self.name, self.type,
167
self.domain, self.host,
168
dbus.UInt16(self.port),
169
avahi.string_array_to_txt_array(self.TXT))
170
group.Commit()
171
172
# From the Avahi example code:
173
group = None # our entry group
43
del syslogger
44
45
# This variable is used to optionally bind to a specified interface.
46
# It is a global variable to fit in with the other variables from the
47
# Avahi server example code.
48
serviceInterface = avahi.IF_UNSPEC
49
# From the Avahi server example code:
50
serviceName = "Mandos"
51
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
52
servicePort = None # Not known at startup
53
serviceTXT = [] # TXT record for the service
54
domain = "" # Domain to publish on, default to .local
55
host = "" # Host to publish records for, default to localhost
56
group = None #our entry group
57
rename_count = 12 # Counter so we only rename after collisions a
58
# sensible number of times
174
59
# End of Avahi example code
175
60
176
61
177
def _datetime_to_dbus(dt, variant_level=0):
178
"""Convert a UTC datetime.datetime() to a D-Bus type."""
179
return dbus.String(dt.isoformat(), variant_level=variant_level)
180
181
182
62
class Client(object):
183
63
"""A representation of a client host served by this server.
184
64
Attributes:
185
name: string; from the config file, used in log messages and
186
D-Bus identifiers
65
name: string; from the config file, used in log messages
187
66
fingerprint: string (40 or 32 hexadecimal digits); used to
188
67
uniquely identify the client
189
secret: bytestring; sent verbatim (over TLS) to client
190
host: string; available for use by the checker command
191
created: datetime.datetime(); (UTC) object creation
192
last_enabled: datetime.datetime(); (UTC)
193
enabled: bool()
194
last_checked_ok: datetime.datetime(); (UTC) or None
195
timeout: datetime.timedelta(); How long from last_checked_ok
196
until this client is invalid
197
interval: datetime.timedelta(); How often to start a new checker
198
disable_hook: If set, called by disable() as disable_hook(self)
199
checker: subprocess.Popen(); a running checker process used
200
to see if the client lives.
201
'None' if no process is running.
68
secret: bytestring; sent verbatim (over TLS) to client
69
fqdn: string (FQDN); available for use by the checker command
70
created: datetime.datetime()
71
last_seen: datetime.datetime() or None if not yet seen
72
timeout: datetime.timedelta(); How long from last_seen until
73
this client is invalid
74
interval: datetime.timedelta(); How often to start a new checker
75
stop_hook: If set, called by stop() as stop_hook(self)
76
checker: subprocess.Popen(); a running checker process used
77
to see if the client lives.
78
Is None if no process is running.
202
79
checker_initiator_tag: a gobject event source tag, or None
203
disable_initiator_tag: - '' -
80
stop_initiator_tag: - '' -
204
81
checker_callback_tag: - '' -
205
82
checker_command: string; External command which is run to check if
206
client lives. %() expansions are done at
83
client lives. %()s expansions are done at
207
84
runtime with vars(self) as dict, so that for
208
85
instance %(name)s can be used in the command.
209
current_checker_command: string; current running checker_command
86
Private attibutes:
87
_timeout: Real variable for 'timeout'
88
_interval: Real variable for 'interval'
89
_timeout_milliseconds: Used by gobject.timeout_add()
90
_interval_milliseconds: - '' -
210
91
"""
211
def timeout_milliseconds(self):
212
"Return the 'timeout' attribute in milliseconds"
213
return ((self.timeout.days * 24 * 60 * 60 * 1000)
214
+ (self.timeout.seconds * 1000)
215
+ (self.timeout.microseconds // 1000))
216
217
def interval_milliseconds(self):
218
"Return the 'interval' attribute in milliseconds"
219
return ((self.interval.days * 24 * 60 * 60 * 1000)
220
+ (self.interval.seconds * 1000)
221
+ (self.interval.microseconds // 1000))
222
223
def __init__(self, name = None, disable_hook=None, config=None):
224
"""Note: the 'checker' key in 'config' sets the
225
'checker_command' attribute and *not* the 'checker'
226
attribute."""
92
def _set_timeout(self, timeout):
93
"Setter function for 'timeout' attribute"
94
self._timeout = timeout
95
self._timeout_milliseconds = ((self.timeout.days
96
* 24 * 60 * 60 * 1000)
97
+ (self.timeout.seconds * 1000)
98
+ (self.timeout.microseconds
99
// 1000))
100
timeout = property(lambda self: self._timeout,
101
_set_timeout)
102
del _set_timeout
103
def _set_interval(self, interval):
104
"Setter function for 'interval' attribute"
105
self._interval = interval
106
self._interval_milliseconds = ((self.interval.days
107
* 24 * 60 * 60 * 1000)
108
+ (self.interval.seconds
109
* 1000)
110
+ (self.interval.microseconds
111
// 1000))
112
interval = property(lambda self: self._interval,
113
_set_interval)
114
del _set_interval
115
def __init__(self, name=None, options=None, stop_hook=None,
116
fingerprint=None, secret=None, secfile=None,
117
fqdn=None, timeout=None, interval=-1, checker=None):
227
118
self.name = name
228
if config is None:
229
config = {}
230
logger.debug(u"Creating client %r", self.name)
231
# Uppercase and remove spaces from fingerprint for later
232
# comparison purposes with return value from the fingerprint()
233
# function
234
self.fingerprint = (config["fingerprint"].upper()
235
.replace(u" ", u""))
236
logger.debug(u" Fingerprint: %s", self.fingerprint)
237
if "secret" in config:
238
self.secret = config["secret"].decode(u"base64")
239
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()
244
else:
245
raise TypeError(u"No secret or secfile for client %s"
246
% self.name)
247
self.host = config.get("host", "")
248
self.created = datetime.datetime.utcnow()
249
self.enabled = False
250
self.last_enabled = None
251
self.last_checked_ok = None
252
self.timeout = string_to_delta(config["timeout"])
253
self.interval = string_to_delta(config["interval"])
254
self.disable_hook = disable_hook
119
# Uppercase and remove spaces from fingerprint
120
# for later comparison purposes with return value of
121
# the fingerprint() function
122
self.fingerprint = fingerprint.upper().replace(u" ", u"")
123
if secret:
124
self.secret = secret.decode(u"base64")
125
elif secfile:
126
sf = open(secfile)
127
self.secret = sf.read()
128
sf.close()
129
else:
130
raise RuntimeError(u"No secret or secfile for client %s"
131
% self.name)
132
self.fqdn = fqdn # string
133
self.created = datetime.datetime.now()
134
self.last_seen = None
135
if timeout is None:
136
self.timeout = options.timeout
137
else:
138
self.timeout = string_to_delta(timeout)
139
if interval == -1:
140
self.interval = options.interval
141
else:
142
self.interval = string_to_delta(interval)
143
self.stop_hook = stop_hook
255
144
self.checker = None
256
145
self.checker_initiator_tag = None
257
self.disable_initiator_tag = None
146
self.stop_initiator_tag = None
258
147
self.checker_callback_tag = None
259
self.checker_command = config["checker"]
260
self.current_checker_command = None
261
self.last_connect = None
262
263
def enable(self):
264
"""Start this client's checker and timeout hooks"""
265
self.last_enabled = datetime.datetime.utcnow()
148
self.check_command = checker
149
def start(self):
150
"""Start this clients checker and timeout hooks"""
266
151
# Schedule a new checker to be started an 'interval' from now,
267
152
# and every interval from then on.
268
self.checker_initiator_tag = (gobject.timeout_add
269
(self.interval_milliseconds(),
270
self.start_checker))
153
self.checker_initiator_tag = gobject.timeout_add\
154
(self._interval_milliseconds,
155
self.start_checker)
271
156
# Also start a new checker *right now*.
272
157
self.start_checker()
273
# Schedule a disable() when 'timeout' has passed
274
self.disable_initiator_tag = (gobject.timeout_add
275
(self.timeout_milliseconds(),
276
self.disable))
277
self.enabled = True
278
279
def disable(self):
280
"""Disable this client."""
281
if not getattr(self, "enabled", False):
282
return False
283
logger.info(u"Disabling client %s", self.name)
284
if getattr(self, "disable_initiator_tag", False):
285
gobject.source_remove(self.disable_initiator_tag)
286
self.disable_initiator_tag = None
287
if getattr(self, "checker_initiator_tag", False):
158
# Schedule a stop() when 'timeout' has passed
159
self.stop_initiator_tag = gobject.timeout_add\
160
(self._timeout_milliseconds,
161
self.stop)
162
def stop(self):
163
"""Stop this client.
164
The possibility that this client might be restarted is left
165
open, but not currently used."""
166
logger.debug(u"Stopping client %s", self.name)
167
self.secret = None
168
if self.stop_initiator_tag:
169
gobject.source_remove(self.stop_initiator_tag)
170
self.stop_initiator_tag = None
171
if self.checker_initiator_tag:
288
172
gobject.source_remove(self.checker_initiator_tag)
289
173
self.checker_initiator_tag = None
290
174
self.stop_checker()
291
if self.disable_hook:
292
self.disable_hook(self)
293
self.enabled = False
175
if self.stop_hook:
176
self.stop_hook(self)
294
177
# Do not run this again if called by a gobject.timeout_add
295
178
return False
296
297
179
def __del__(self):
298
self.disable_hook = None
299
self.disable()
300
301
def checker_callback(self, pid, condition, command):
180
# Some code duplication here and in stop()
181
if hasattr(self, "stop_initiator_tag") \
182
and self.stop_initiator_tag:
183
gobject.source_remove(self.stop_initiator_tag)
184
self.stop_initiator_tag = None
185
if hasattr(self, "checker_initiator_tag") \
186
and self.checker_initiator_tag:
187
gobject.source_remove(self.checker_initiator_tag)
188
self.checker_initiator_tag = None
189
self.stop_checker()
190
def checker_callback(self, pid, condition):
302
191
"""The checker has completed, so take appropriate actions."""
303
self.checker_callback_tag = None
304
self.checker = None
305
if os.WIFEXITED(condition):
306
exitstatus = os.WEXITSTATUS(condition)
307
if exitstatus == 0:
308
logger.info(u"Checker for %(name)s succeeded",
309
vars(self))
310
self.checked_ok()
311
else:
312
logger.info(u"Checker for %(name)s failed",
313
vars(self))
314
else:
192
now = datetime.datetime.now()
193
if os.WIFEXITED(condition) \
194
and (os.WEXITSTATUS(condition) == 0):
195
logger.debug(u"Checker for %(name)s succeeded",
196
vars(self))
197
self.last_seen = now
198
gobject.source_remove(self.stop_initiator_tag)
199
self.stop_initiator_tag = gobject.timeout_add\
200
(self._timeout_milliseconds,
201
self.stop)
202
elif not os.WIFEXITED(condition):
315
203
logger.warning(u"Checker for %(name)s crashed?",
316
204
vars(self))
317
318
def checked_ok(self):
319
"""Bump up the timeout for this client.
320
This should only be called when the client has been seen,
321
alive and well.
322
"""
323
self.last_checked_ok = datetime.datetime.utcnow()
324
gobject.source_remove(self.disable_initiator_tag)
325
self.disable_initiator_tag = (gobject.timeout_add
326
(self.timeout_milliseconds(),
327
self.disable))
328
205
else:
206
logger.debug(u"Checker for %(name)s failed",
207
vars(self))
208
self.checker = None
209
self.checker_callback_tag = None
329
210
def start_checker(self):
330
211
"""Start a new checker subprocess if one is not running.
331
212
If a checker already exists, leave it running and do
332
213
nothing."""
333
# The reason for not killing a running checker is that if we
334
# did that, then if a checker (for some reason) started
335
# running slowly and taking more than 'interval' time, the
336
# client would inevitably timeout, since no checker would get
337
# a chance to run to completion. If we instead leave running
338
# checkers alone, the checker would have to take more time
339
# than 'timeout' for the client to be declared invalid, which
340
# is as it should be.
341
342
# If a checker exists, make sure it is not a zombie
343
if self.checker is not None:
344
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
345
if pid:
346
logger.warning("Checker was a zombie")
347
gobject.source_remove(self.checker_callback_tag)
348
self.checker_callback(pid, status,
349
self.current_checker_command)
350
# Start a new checker if needed
351
214
if self.checker is None:
352
215
try:
353
# In case checker_command has exactly one % operator
354
command = self.checker_command % self.host
216
command = self.check_command % self.fqdn
355
217
except TypeError:
356
# Escape attributes for the shell
357
218
escaped_attrs = dict((key, re.escape(str(val)))
358
219
for key, val in
359
220
vars(self).iteritems())
360
221
try:
361
command = self.checker_command % escaped_attrs
222
command = self.check_command % escaped_attrs
362
223
except TypeError, error:
363
logger.error(u'Could not format string "%s":'
364
u' %s', self.checker_command, error)
224
logger.critical(u'Could not format string "%s":'
225
u' %s', self.check_command, error)
365
226
return True # Try again later
366
self.current_checker_command = command
367
227
try:
368
logger.info(u"Starting checker %r for %s",
369
command, self.name)
370
# We don't need to redirect stdout and stderr, since
371
# in normal mode, that is already done by daemon(),
372
# and in debug mode we don't want to. (Stdin is
373
# always replaced by /dev/null.)
374
self.checker = subprocess.Popen(command,
375
close_fds=True,
376
shell=True, cwd="/")
377
self.checker_callback_tag = (gobject.child_watch_add
378
(self.checker.pid,
379
self.checker_callback,
380
data=command))
381
# The checker may have completed before the gobject
382
# watch was added. Check for this.
383
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
384
if pid:
385
gobject.source_remove(self.checker_callback_tag)
386
self.checker_callback(pid, status, command)
387
except OSError, error:
228
logger.debug(u"Starting checker %r for %s",
229
command, self.name)
230
self.checker = subprocess.\
231
Popen(command,
232
close_fds=True, shell=True,
233
cwd="/")
234
self.checker_callback_tag = gobject.child_watch_add\
235
(self.checker.pid,
236
self.checker_callback)
237
except subprocess.OSError, error:
388
238
logger.error(u"Failed to start subprocess: %s",
389
239
error)
390
240
# Re-run this periodically if run by gobject.timeout_add
391
241
return True
392
393
242
def stop_checker(self):
394
243
"""Force the checker process, if any, to stop."""
395
if self.checker_callback_tag:
396
gobject.source_remove(self.checker_callback_tag)
397
self.checker_callback_tag = None
398
if getattr(self, "checker", None) is None:
244
if not hasattr(self, "checker") or self.checker is None:
399
245
return
400
logger.debug(u"Stopping checker for %(name)s", vars(self))
401
try:
402
os.kill(self.checker.pid, signal.SIGTERM)
403
#os.sleep(0.5)
404
#if self.checker.poll() is None:
405
# os.kill(self.checker.pid, signal.SIGKILL)
406
except OSError, error:
407
if error.errno != errno.ESRCH: # No such process
408
raise
246
gobject.source_remove(self.checker_callback_tag)
247
self.checker_callback_tag = None
248
os.kill(self.checker.pid, signal.SIGTERM)
249
if self.checker.poll() is None:
250
os.kill(self.checker.pid, signal.SIGKILL)
409
251
self.checker = None
410
411
def still_valid(self):
252
def still_valid(self, now=None):
412
253
"""Has the timeout not yet passed for this client?"""
413
if not getattr(self, "enabled", False):
414
return False
415
now = datetime.datetime.utcnow()
416
if self.last_checked_ok is None:
254
if now is None:
255
now = datetime.datetime.now()
256
if self.last_seen is None:
417
257
return now < (self.created + self.timeout)
418
258
else:
419
return now < (self.last_checked_ok + self.timeout)
420
421
422
class ClientDBus(Client, dbus.service.Object):
423
"""A Client class using D-Bus
424
Attributes:
425
dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus
426
"""
427
# dbus.service.Object doesn't use super(), so we can't either.
428
429
def __init__(self, *args, **kwargs):
430
Client.__init__(self, *args, **kwargs)
431
# Only now, when this client is initialized, can it show up on
432
# the D-Bus
433
self.dbus_object_path = (dbus.ObjectPath
434
("/clients/"
435
+ self.name.replace(".", "_")))
436
dbus.service.Object.__init__(self, bus,
437
self.dbus_object_path)
438
def enable(self):
439
oldstate = getattr(self, "enabled", False)
440
r = Client.enable(self)
441
if oldstate != self.enabled:
442
# Emit D-Bus signals
443
self.PropertyChanged(dbus.String(u"enabled"),
444
dbus.Boolean(True, variant_level=1))
445
self.PropertyChanged(dbus.String(u"last_enabled"),
446
(_datetime_to_dbus(self.last_enabled,
447
variant_level=1)))
448
return r
449
450
def disable(self, signal = True):
451
oldstate = getattr(self, "enabled", False)
452
r = Client.disable(self)
453
if signal and oldstate != self.enabled:
454
# Emit D-Bus signal
455
self.PropertyChanged(dbus.String(u"enabled"),
456
dbus.Boolean(False, variant_level=1))
457
return r
458
459
def __del__(self, *args, **kwargs):
460
try:
461
self.remove_from_connection()
462
except LookupError:
463
pass
464
if hasattr(dbus.service.Object, "__del__"):
465
dbus.service.Object.__del__(self, *args, **kwargs)
466
Client.__del__(self, *args, **kwargs)
467
468
def checker_callback(self, pid, condition, command,
469
*args, **kwargs):
470
self.checker_callback_tag = None
471
self.checker = None
472
# Emit D-Bus signal
473
self.PropertyChanged(dbus.String(u"checker_running"),
474
dbus.Boolean(False, variant_level=1))
475
if os.WIFEXITED(condition):
476
exitstatus = os.WEXITSTATUS(condition)
477
# Emit D-Bus signal
478
self.CheckerCompleted(dbus.Int16(exitstatus),
479
dbus.Int64(condition),
480
dbus.String(command))
481
else:
482
# Emit D-Bus signal
483
self.CheckerCompleted(dbus.Int16(-1),
484
dbus.Int64(condition),
485
dbus.String(command))
486
487
return Client.checker_callback(self, pid, condition, command,
488
*args, **kwargs)
489
490
def checked_ok(self, *args, **kwargs):
491
r = Client.checked_ok(self, *args, **kwargs)
492
# Emit D-Bus signal
493
self.PropertyChanged(
494
dbus.String(u"last_checked_ok"),
495
(_datetime_to_dbus(self.last_checked_ok,
496
variant_level=1)))
497
return r
498
499
def start_checker(self, *args, **kwargs):
500
old_checker = self.checker
501
if self.checker is not None:
502
old_checker_pid = self.checker.pid
503
else:
504
old_checker_pid = None
505
r = Client.start_checker(self, *args, **kwargs)
506
# Only if new checker process was started
507
if (self.checker is not None
508
and old_checker_pid != self.checker.pid):
509
# Emit D-Bus signal
510
self.CheckerStarted(self.current_checker_command)
511
self.PropertyChanged(
512
dbus.String("checker_running"),
513
dbus.Boolean(True, variant_level=1))
514
return r
515
516
def stop_checker(self, *args, **kwargs):
517
old_checker = getattr(self, "checker", None)
518
r = Client.stop_checker(self, *args, **kwargs)
519
if (old_checker is not None
520
and getattr(self, "checker", None) is None):
521
self.PropertyChanged(dbus.String(u"checker_running"),
522
dbus.Boolean(False, variant_level=1))
523
return r
524
525
## D-Bus methods & signals
526
_interface = u"se.bsnet.fukt.Mandos.Client"
527
528
# CheckedOK - method
529
CheckedOK = dbus.service.method(_interface)(checked_ok)
530
CheckedOK.__name__ = "CheckedOK"
531
532
# CheckerCompleted - signal
533
@dbus.service.signal(_interface, signature="nxs")
534
def CheckerCompleted(self, exitcode, waitstatus, command):
535
"D-Bus signal"
536
pass
537
538
# CheckerStarted - signal
539
@dbus.service.signal(_interface, signature="s")
540
def CheckerStarted(self, command):
541
"D-Bus signal"
542
pass
543
544
# GetAllProperties - method
545
@dbus.service.method(_interface, out_signature="a{sv}")
546
def GetAllProperties(self):
547
"D-Bus method"
548
return dbus.Dictionary({
549
dbus.String("name"):
550
dbus.String(self.name, variant_level=1),
551
dbus.String("fingerprint"):
552
dbus.String(self.fingerprint, variant_level=1),
553
dbus.String("host"):
554
dbus.String(self.host, variant_level=1),
555
dbus.String("created"):
556
_datetime_to_dbus(self.created, variant_level=1),
557
dbus.String("last_enabled"):
558
(_datetime_to_dbus(self.last_enabled,
559
variant_level=1)
560
if self.last_enabled is not None
561
else dbus.Boolean(False, variant_level=1)),
562
dbus.String("enabled"):
563
dbus.Boolean(self.enabled, variant_level=1),
564
dbus.String("last_checked_ok"):
565
(_datetime_to_dbus(self.last_checked_ok,
566
variant_level=1)
567
if self.last_checked_ok is not None
568
else dbus.Boolean (False, variant_level=1)),
569
dbus.String("timeout"):
570
dbus.UInt64(self.timeout_milliseconds(),
571
variant_level=1),
572
dbus.String("interval"):
573
dbus.UInt64(self.interval_milliseconds(),
574
variant_level=1),
575
dbus.String("checker"):
576
dbus.String(self.checker_command,
577
variant_level=1),
578
dbus.String("checker_running"):
579
dbus.Boolean(self.checker is not None,
580
variant_level=1),
581
dbus.String("object_path"):
582
dbus.ObjectPath(self.dbus_object_path,
583
variant_level=1)
584
}, signature="sv")
585
586
# IsStillValid - method
587
@dbus.service.method(_interface, out_signature="b")
588
def IsStillValid(self):
589
return self.still_valid()
590
591
# PropertyChanged - signal
592
@dbus.service.signal(_interface, signature="sv")
593
def PropertyChanged(self, property, value):
594
"D-Bus signal"
595
pass
596
597
# ReceivedSecret - signal
598
@dbus.service.signal(_interface)
599
def ReceivedSecret(self):
600
"D-Bus signal"
601
pass
602
603
# Rejected - signal
604
@dbus.service.signal(_interface)
605
def Rejected(self):
606
"D-Bus signal"
607
pass
608
609
# SetChecker - method
610
@dbus.service.method(_interface, in_signature="s")
611
def SetChecker(self, checker):
612
"D-Bus setter method"
613
self.checker_command = checker
614
# Emit D-Bus signal
615
self.PropertyChanged(dbus.String(u"checker"),
616
dbus.String(self.checker_command,
617
variant_level=1))
618
619
# SetHost - method
620
@dbus.service.method(_interface, in_signature="s")
621
def SetHost(self, host):
622
"D-Bus setter method"
623
self.host = host
624
# Emit D-Bus signal
625
self.PropertyChanged(dbus.String(u"host"),
626
dbus.String(self.host, variant_level=1))
627
628
# SetInterval - method
629
@dbus.service.method(_interface, in_signature="t")
630
def SetInterval(self, milliseconds):
631
self.interval = datetime.timedelta(0, 0, 0, milliseconds)
632
# Emit D-Bus signal
633
self.PropertyChanged(dbus.String(u"interval"),
634
(dbus.UInt64(self.interval_milliseconds(),
635
variant_level=1)))
636
637
# SetSecret - method
638
@dbus.service.method(_interface, in_signature="ay",
639
byte_arrays=True)
640
def SetSecret(self, secret):
641
"D-Bus setter method"
642
self.secret = str(secret)
643
644
# SetTimeout - method
645
@dbus.service.method(_interface, in_signature="t")
646
def SetTimeout(self, milliseconds):
647
self.timeout = datetime.timedelta(0, 0, 0, milliseconds)
648
# Emit D-Bus signal
649
self.PropertyChanged(dbus.String(u"timeout"),
650
(dbus.UInt64(self.timeout_milliseconds(),
651
variant_level=1)))
652
653
# Enable - method
654
Enable = dbus.service.method(_interface)(enable)
655
Enable.__name__ = "Enable"
656
657
# StartChecker - method
658
@dbus.service.method(_interface)
659
def StartChecker(self):
660
"D-Bus method"
661
self.start_checker()
662
663
# Disable - method
664
@dbus.service.method(_interface)
665
def Disable(self):
666
"D-Bus method"
667
self.disable()
668
669
# StopChecker - method
670
StopChecker = dbus.service.method(_interface)(stop_checker)
671
StopChecker.__name__ = "StopChecker"
672
673
del _interface
674
675
676
class TCP_handler(SocketServer.BaseRequestHandler, object):
259
return now < (self.last_seen + self.timeout)
260
261
262
def peer_certificate(session):
263
"Return an OpenPGP data packet string for the peer's certificate"
264
# If not an OpenPGP certificate...
265
if gnutls.library.functions.gnutls_certificate_type_get\
266
(session._c_object) \
267
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
268
# ...do the normal thing
269
return session.peer_certificate
270
list_size = ctypes.c_uint()
271
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
272
(session._c_object, ctypes.byref(list_size))
273
if list_size.value == 0:
274
return None
275
cert = cert_list[0]
276
return ctypes.string_at(cert.data, cert.size)
277
278
279
def fingerprint(openpgp):
280
"Convert an OpenPGP data string to a hexdigit fingerprint string"
281
# New empty GnuTLS certificate
282
crt = gnutls.library.types.gnutls_openpgp_crt_t()
283
gnutls.library.functions.gnutls_openpgp_crt_init\
284
(ctypes.byref(crt))
285
# New GnuTLS "datum" with the OpenPGP public key
286
datum = gnutls.library.types.gnutls_datum_t\
287
(ctypes.cast(ctypes.c_char_p(openpgp),
288
ctypes.POINTER(ctypes.c_ubyte)),
289
ctypes.c_uint(len(openpgp)))
290
# Import the OpenPGP public key into the certificate
291
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
292
(crt,
293
ctypes.byref(datum),
294
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
295
# New buffer for the fingerprint
296
buffer = ctypes.create_string_buffer(20)
297
buffer_length = ctypes.c_size_t()
298
# Get the fingerprint from the certificate into the buffer
299
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
300
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
301
# Deinit the certificate
302
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
303
# Convert the buffer to a Python bytestring
304
fpr = ctypes.string_at(buffer, buffer_length.value)
305
# Convert the bytestring to hexadecimal notation
306
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
307
return hex_fpr
308
309
310
class tcp_handler(SocketServer.BaseRequestHandler, object):
677
311
"""A TCP request handler class.
678
312
Instantiated by IPv6_TCPServer for each request to handle it.
679
313
Note: This will run in its own forked process."""
680
314
681
315
def handle(self):
682
logger.info(u"TCP connection from: %s",
683
unicode(self.client_address))
684
logger.debug(u"IPC Pipe FD: %d", self.server.pipe[1])
685
# Open IPC pipe to parent process
686
with closing(os.fdopen(self.server.pipe[1], "w", 1)) as ipc:
687
session = (gnutls.connection
688
.ClientSession(self.request,
689
gnutls.connection
690
.X509Credentials()))
691
692
line = self.request.makefile().readline()
693
logger.debug(u"Protocol version: %r", line)
694
try:
695
if int(line.strip().split()[0]) > 1:
696
raise RuntimeError
697
except (ValueError, IndexError, RuntimeError), error:
698
logger.error(u"Unknown protocol version: %s", error)
699
return
700
701
# Note: gnutls.connection.X509Credentials is really a
702
# generic GnuTLS certificate credentials object so long as
703
# no X.509 keys are added to it. Therefore, we can use it
704
# here despite using OpenPGP certificates.
705
706
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
707
# "+AES-256-CBC", "+SHA1",
708
# "+COMP-NULL", "+CTYPE-OPENPGP",
709
# "+DHE-DSS"))
710
# Use a fallback default, since this MUST be set.
711
priority = self.server.settings.get("priority", "NORMAL")
712
(gnutls.library.functions
713
.gnutls_priority_set_direct(session._c_object,
714
priority, None))
715
716
try:
717
session.handshake()
718
except gnutls.errors.GNUTLSError, error:
719
logger.warning(u"Handshake failed: %s", error)
720
# Do not run session.bye() here: the session is not
721
# established. Just abandon the request.
722
return
723
logger.debug(u"Handshake succeeded")
724
try:
725
fpr = self.fingerprint(self.peer_certificate(session))
726
except (TypeError, gnutls.errors.GNUTLSError), error:
727
logger.warning(u"Bad certificate: %s", error)
728
session.bye()
729
return
730
logger.debug(u"Fingerprint: %s", fpr)
731
732
for c in self.server.clients:
733
if c.fingerprint == fpr:
734
client = c
735
break
316
logger.debug(u"TCP connection from: %s",
317
unicode(self.client_address))
318
session = gnutls.connection.ClientSession(self.request,
319
gnutls.connection.\
320
X509Credentials())
321
322
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
323
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
324
# "+DHE-DSS"))
325
priority = "SECURE256"
326
327
gnutls.library.functions.gnutls_priority_set_direct\
328
(session._c_object, priority, None);
329
330
try:
331
session.handshake()
332
except gnutls.errors.GNUTLSError, error:
333
logger.debug(u"Handshake failed: %s", error)
334
# Do not run session.bye() here: the session is not
335
# established. Just abandon the request.
336
return
337
try:
338
fpr = fingerprint(peer_certificate(session))
339
except (TypeError, gnutls.errors.GNUTLSError), error:
340
logger.debug(u"Bad certificate: %s", error)
341
session.bye()
342
return
343
logger.debug(u"Fingerprint: %s", fpr)
344
client = None
345
for c in clients:
346
if c.fingerprint == fpr:
347
client = c
348
break
349
# Have to check if client.still_valid(), since it is possible
350
# that the client timed out while establishing the GnuTLS
351
# session.
352
if (not client) or (not client.still_valid()):
353
if client:
354
logger.debug(u"Client %(name)s is invalid",
355
vars(client))
736
356
else:
737
ipc.write("NOTFOUND %s\n" % fpr)
738
session.bye()
739
return
740
# Have to check if client.still_valid(), since it is
741
# possible that the client timed out while establishing
742
# the GnuTLS session.
743
if not client.still_valid():
744
ipc.write("INVALID %s\n" % client.name)
745
session.bye()
746
return
747
ipc.write("SENDING %s\n" % client.name)
748
sent_size = 0
749
while sent_size < len(client.secret):
750
sent = session.send(client.secret[sent_size:])
751
logger.debug(u"Sent: %d, remaining: %d",
752
sent, len(client.secret)
753
- (sent_size + sent))
754
sent_size += sent
357
logger.debug(u"Client not found for fingerprint: %s",
358
fpr)
755
359
session.bye()
756
757
@staticmethod
758
def peer_certificate(session):
759
"Return the peer's OpenPGP certificate as a bytestring"
760
# If not an OpenPGP certificate...
761
if (gnutls.library.functions
762
.gnutls_certificate_type_get(session._c_object)
763
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
764
# ...do the normal thing
765
return session.peer_certificate
766
list_size = ctypes.c_uint(1)
767
cert_list = (gnutls.library.functions
768
.gnutls_certificate_get_peers
769
(session._c_object, ctypes.byref(list_size)))
770
if not bool(cert_list) and list_size.value != 0:
771
raise gnutls.errors.GNUTLSError("error getting peer"
772
" certificate")
773
if list_size.value == 0:
774
return None
775
cert = cert_list[0]
776
return ctypes.string_at(cert.data, cert.size)
777
778
@staticmethod
779
def fingerprint(openpgp):
780
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
781
# New GnuTLS "datum" with the OpenPGP public key
782
datum = (gnutls.library.types
783
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
784
ctypes.POINTER
785
(ctypes.c_ubyte)),
786
ctypes.c_uint(len(openpgp))))
787
# New empty GnuTLS certificate
788
crt = gnutls.library.types.gnutls_openpgp_crt_t()
789
(gnutls.library.functions
790
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
791
# Import the OpenPGP public key into the certificate
792
(gnutls.library.functions
793
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
794
gnutls.library.constants
795
.GNUTLS_OPENPGP_FMT_RAW))
796
# Verify the self signature in the key
797
crtverify = ctypes.c_uint()
798
(gnutls.library.functions
799
.gnutls_openpgp_crt_verify_self(crt, 0,
800
ctypes.byref(crtverify)))
801
if crtverify.value != 0:
802
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
803
raise (gnutls.errors.CertificateSecurityError
804
("Verify failed"))
805
# New buffer for the fingerprint
806
buf = ctypes.create_string_buffer(20)
807
buf_len = ctypes.c_size_t()
808
# Get the fingerprint from the certificate into the buffer
809
(gnutls.library.functions
810
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
811
ctypes.byref(buf_len)))
812
# Deinit the certificate
813
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
814
# Convert the buffer to a Python bytestring
815
fpr = ctypes.string_at(buf, buf_len.value)
816
# Convert the bytestring to hexadecimal notation
817
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
818
return hex_fpr
819
820
821
class ForkingMixInWithPipe(SocketServer.ForkingMixIn, object):
822
"""Like SocketServer.ForkingMixIn, but also pass a pipe.
823
Assumes a gobject.MainLoop event loop.
824
"""
825
def process_request(self, request, client_address):
826
"""This overrides and wraps the original process_request().
827
This function creates a new pipe in self.pipe
828
"""
829
self.pipe = os.pipe()
830
super(ForkingMixInWithPipe,
831
self).process_request(request, client_address)
832
os.close(self.pipe[1]) # close write end
833
# Call "handle_ipc" for both data and EOF events
834
gobject.io_add_watch(self.pipe[0],
835
gobject.IO_IN | gobject.IO_HUP,
836
self.handle_ipc)
837
def handle_ipc(source, condition):
838
"""Dummy function; override as necessary"""
839
os.close(source)
840
return False
841
842
843
class IPv6_TCPServer(ForkingMixInWithPipe,
844
SocketServer.TCPServer, object):
845
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
360
return
361
sent_size = 0
362
while sent_size < len(client.secret):
363
sent = session.send(client.secret[sent_size:])
364
logger.debug(u"Sent: %d, remaining: %d",
365
sent, len(client.secret)
366
- (sent_size + sent))
367
sent_size += sent
368
session.bye()
369
370
371
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
372
"""IPv6 TCP server. Accepts 'None' as address and/or port.
846
373
Attributes:
847
settings: Server settings
374
options: Command line options
848
375
clients: Set() of Client objects
849
enabled: Boolean; whether this server is activated yet
850
376
"""
851
377
address_family = socket.AF_INET6
852
378
def __init__(self, *args, **kwargs):
853
if "settings" in kwargs:
854
self.settings = kwargs["settings"]
855
del kwargs["settings"]
379
if "options" in kwargs:
380
self.options = kwargs["options"]
381
del kwargs["options"]
856
382
if "clients" in kwargs:
857
383
self.clients = kwargs["clients"]
858
384
del kwargs["clients"]
859
if "use_ipv6" in kwargs:
860
if not kwargs["use_ipv6"]:
861
self.address_family = socket.AF_INET
862
del kwargs["use_ipv6"]
863
self.enabled = False
864
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
385
return super(type(self), self).__init__(*args, **kwargs)
865
386
def server_bind(self):
866
387
"""This overrides the normal server_bind() function
867
388
to bind to an interface if one was specified, and also NOT to
868
389
bind to an address or port if they were not specified."""
869
if self.settings["interface"]:
870
# 25 is from /usr/include/asm-i486/socket.h
871
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
390
if self.options.interface:
391
if not hasattr(socket, "SO_BINDTODEVICE"):
392
# From /usr/include/asm-i486/socket.h
393
socket.SO_BINDTODEVICE = 25
872
394
try:
873
395
self.socket.setsockopt(socket.SOL_SOCKET,
874
SO_BINDTODEVICE,
875
self.settings["interface"])
396
socket.SO_BINDTODEVICE,
397
self.options.interface)
876
398
except socket.error, error:
877
399
if error[0] == errno.EPERM:
878
logger.error(u"No permission to"
879
u" bind to interface %s",
880
self.settings["interface"])
400
logger.warning(u"No permission to"
401
u" bind to interface %s",
402
self.options.interface)
881
403
else:
882
raise
404
raise error
883
405
# Only bind(2) the socket if we really need to.
884
406
if self.server_address[0] or self.server_address[1]:
885
407
if not self.server_address[0]:
886
if self.address_family == socket.AF_INET6:
887
any_address = "::" # in6addr_any
888
else:
889
any_address = socket.INADDR_ANY
890
self.server_address = (any_address,
408
in6addr_any = "::"
409
self.server_address = (in6addr_any,
891
410
self.server_address[1])
892
elif not self.server_address[1]:
411
elif self.server_address[1] is None:
893
412
self.server_address = (self.server_address[0],
894
413
0)
895
# if self.settings["interface"]:
896
# self.server_address = (self.server_address[0],
897
# 0, # port
898
# 0, # flowinfo
899
# if_nametoindex
900
# (self.settings
901
# ["interface"]))
902
return super(IPv6_TCPServer, self).server_bind()
903
def server_activate(self):
904
if self.enabled:
905
return super(IPv6_TCPServer, self).server_activate()
906
def enable(self):
907
self.enabled = True
908
def handle_ipc(self, source, condition, file_objects={}):
909
condition_names = {
910
gobject.IO_IN: "IN", # There is data to read.
911
gobject.IO_OUT: "OUT", # Data can be written (without
912
# blocking).
913
gobject.IO_PRI: "PRI", # There is urgent data to read.
914
gobject.IO_ERR: "ERR", # Error condition.
915
gobject.IO_HUP: "HUP" # Hung up (the connection has been
916
# broken, usually for pipes and
917
# sockets).
918
}
919
conditions_string = ' | '.join(name
920
for cond, name in
921
condition_names.iteritems()
922
if cond & condition)
923
logger.debug("Handling IPC: FD = %d, condition = %s", source,
924
conditions_string)
925
926
# Turn the pipe file descriptor into a Python file object
927
if source not in file_objects:
928
file_objects[source] = os.fdopen(source, "r", 1)
929
930
# Read a line from the file object
931
cmdline = file_objects[source].readline()
932
if not cmdline: # Empty line means end of file
933
# close the IPC pipe
934
file_objects[source].close()
935
del file_objects[source]
936
937
# Stop calling this function
938
return False
939
940
logger.debug("IPC command: %r", cmdline)
941
942
# Parse and act on command
943
cmd, args = cmdline.rstrip("\r\n").split(None, 1)
944
945
if cmd == "NOTFOUND":
946
logger.warning(u"Client not found for fingerprint: %s",
947
args)
948
if self.settings["use_dbus"]:
949
# Emit D-Bus signal
950
mandos_dbus_service.ClientNotFound(args)
951
elif cmd == "INVALID":
952
for client in self.clients:
953
if client.name == args:
954
logger.warning(u"Client %s is invalid", args)
955
if self.settings["use_dbus"]:
956
# Emit D-Bus signal
957
client.Rejected()
958
break
959
else:
960
logger.error(u"Unknown client %s is invalid", args)
961
elif cmd == "SENDING":
962
for client in self.clients:
963
if client.name == args:
964
logger.info(u"Sending secret to %s", client.name)
965
client.checked_ok()
966
if self.settings["use_dbus"]:
967
# Emit D-Bus signal
968
client.ReceivedSecret()
969
break
970
else:
971
logger.error(u"Sending secret to unknown client %s",
972
args)
973
else:
974
logger.error("Unknown IPC command: %r", cmdline)
975
976
# Keep calling this function
977
return True
414
return super(type(self), self).server_bind()
978
415
979
416
980
417
def string_to_delta(interval):
981
418
"""Parse a string and return a datetime.timedelta
982
419
983
420
>>> string_to_delta('7d')
984
421
datetime.timedelta(7)
985
422
>>> string_to_delta('60s')
990
427
datetime.timedelta(1)
991
428
>>> string_to_delta(u'1w')
992
429
datetime.timedelta(7)
993
>>> string_to_delta('5m 30s')
994
datetime.timedelta(0, 330)
995
430
"""
996
timevalue = datetime.timedelta(0)
997
for s in interval.split():
998
try:
999
suffix = unicode(s[-1])
1000
value = int(s[:-1])
1001
if suffix == u"d":
1002
delta = datetime.timedelta(value)
1003
elif suffix == u"s":
1004
delta = datetime.timedelta(0, value)
1005
elif suffix == u"m":
1006
delta = datetime.timedelta(0, 0, 0, 0, value)
1007
elif suffix == u"h":
1008
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
1009
elif suffix == u"w":
1010
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
1011
else:
1012
raise ValueError
1013
except (ValueError, IndexError):
431
try:
432
suffix=unicode(interval[-1])
433
value=int(interval[:-1])
434
if suffix == u"d":
435
delta = datetime.timedelta(value)
436
elif suffix == u"s":
437
delta = datetime.timedelta(0, value)
438
elif suffix == u"m":
439
delta = datetime.timedelta(0, 0, 0, 0, value)
440
elif suffix == u"h":
441
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
442
elif suffix == u"w":
443
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
444
else:
1014
445
raise ValueError
1015
timevalue += delta
1016
return timevalue
446
except (ValueError, IndexError):
447
raise ValueError
448
return delta
449
450
451
def add_service():
452
"""From the Avahi server example code"""
453
global group, serviceName, serviceType, servicePort, serviceTXT, \
454
domain, host
455
if group is None:
456
group = dbus.Interface(
457
bus.get_object( avahi.DBUS_NAME,
458
server.EntryGroupNew()),
459
avahi.DBUS_INTERFACE_ENTRY_GROUP)
460
group.connect_to_signal('StateChanged',
461
entry_group_state_changed)
462
logger.debug(u"Adding service '%s' of type '%s' ...",
463
serviceName, serviceType)
464
465
group.AddService(
466
serviceInterface, # interface
467
avahi.PROTO_INET6, # protocol
468
dbus.UInt32(0), # flags
469
serviceName, serviceType,
470
domain, host,
471
dbus.UInt16(servicePort),
472
avahi.string_array_to_txt_array(serviceTXT))
473
group.Commit()
474
475
476
def remove_service():
477
"""From the Avahi server example code"""
478
global group
479
480
if not group is None:
481
group.Reset()
1017
482
1018
483
1019
484
def server_state_changed(state):
1020
"""Derived from the Avahi example code"""
485
"""From the Avahi server example code"""
1021
486
if state == avahi.SERVER_COLLISION:
1022
logger.error(u"Zeroconf server name collision")
1023
service.remove()
487
logger.warning(u"Server name collision")
488
remove_service()
1024
489
elif state == avahi.SERVER_RUNNING:
1025
service.add()
490
add_service()
1026
491
1027
492
1028
493
def entry_group_state_changed(state, error):
1029
"""Derived from the Avahi example code"""
1030
logger.debug(u"Avahi state change: %i", state)
494
"""From the Avahi server example code"""
495
global serviceName, server, rename_count
496
497
logger.debug(u"state change: %i", state)
1031
498
1032
499
if state == avahi.ENTRY_GROUP_ESTABLISHED:
1033
logger.debug(u"Zeroconf service established.")
500
logger.debug(u"Service established.")
1034
501
elif state == avahi.ENTRY_GROUP_COLLISION:
1035
logger.warning(u"Zeroconf service name collision.")
1036
service.rename()
502
503
rename_count = rename_count - 1
504
if rename_count > 0:
505
name = server.GetAlternativeServiceName(name)
506
logger.warning(u"Service name collision, "
507
u"changing name to '%s' ...", name)
508
remove_service()
509
add_service()
510
511
else:
512
logger.error(u"No suitable service name found after %i"
513
u" retries, exiting.", n_rename)
514
killme(1)
1037
515
elif state == avahi.ENTRY_GROUP_FAILURE:
1038
logger.critical(u"Avahi: Error in group state changed %s",
1039
unicode(error))
1040
raise AvahiGroupError(u"State changed: %s" % unicode(error))
516
logger.error(u"Error in group state changed %s",
517
unicode(error))
518
killme(1)
519
1041
520
1042
521
def if_nametoindex(interface):
1043
"""Call the C function if_nametoindex(), or equivalent"""
1044
global if_nametoindex
522
"""Call the C function if_nametoindex()"""
1045
523
try:
1046
if_nametoindex = (ctypes.cdll.LoadLibrary
1047
(ctypes.util.find_library("c"))
1048
.if_nametoindex)
524
libc = ctypes.cdll.LoadLibrary("libc.so.6")
525
return libc.if_nametoindex(interface)
1049
526
except (OSError, AttributeError):
1050
527
if "struct" not in sys.modules:
1051
528
import struct
1052
529
if "fcntl" not in sys.modules:
1053
530
import fcntl
1054
def if_nametoindex(interface):
1055
"Get an interface index the hard way, i.e. using fcntl()"
1056
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
1057
with closing(socket.socket()) as s:
1058
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
1059
struct.pack("16s16x", interface))
1060
interface_index = struct.unpack("I", ifreq[16:20])[0]
1061
return interface_index
1062
return if_nametoindex(interface)
1063
1064
1065
def daemon(nochdir = False, noclose = False):
531
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
532
s = socket.socket()
533
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
534
struct.pack("16s16x", interface))
535
s.close()
536
interface_index = struct.unpack("I", ifreq[16:20])[0]
537
return interface_index
538
539
540
def daemon(nochdir, noclose):
1066
541
"""See daemon(3). Standard BSD Unix function.
1067
542
This should really exist as os.daemon, but it doesn't (yet)."""
1068
543
if os.fork():
1070
545
os.setsid()
1071
546
if not nochdir:
1072
547
os.chdir("/")
1073
if os.fork():
1074
sys.exit()
1075
548
if not noclose:
1076
549
# Close all standard open file descriptors
1077
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
550
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
1078
551
if not stat.S_ISCHR(os.fstat(null).st_mode):
1079
552
raise OSError(errno.ENODEV,
1080
553
"/dev/null not a character device")
1085
558
os.close(null)
1086
559
1087
560
1088
def main():
1089
1090
######################################################################
1091
# Parsing of options, both command line and config file
1092
1093
parser = optparse.OptionParser(version = "%%prog %s" % version)
561
def killme(status = 0):
562
logger.debug("Stopping server with exit status %d", status)
563
exitstatus = status
564
if main_loop_started:
565
main_loop.quit()
566
else:
567
sys.exit(status)
568
569
570
if __name__ == '__main__':
571
exitstatus = 0
572
main_loop_started = False
573
parser = OptionParser()
1094
574
parser.add_option("-i", "--interface", type="string",
1095
metavar="IF", help="Bind to interface IF")
1096
parser.add_option("-a", "--address", type="string",
1097
help="Address to listen for requests on")
1098
parser.add_option("-p", "--port", type="int",
575
default=None, metavar="IF",
576
help="Bind to interface IF")
577
parser.add_option("-p", "--port", type="int", default=None,
1099
578
help="Port number to receive requests on")
1100
parser.add_option("--check", action="store_true",
579
parser.add_option("--timeout", type="string", # Parsed later
580
default="1h",
581
help="Amount of downtime allowed for clients")
582
parser.add_option("--interval", type="string", # Parsed later
583
default="5m",
584
help="How often to check that a client is up")
585
parser.add_option("--check", action="store_true", default=False,
1101
586
help="Run self-test")
1102
parser.add_option("--debug", action="store_true",
1103
help="Debug mode; run in foreground and log to"
1104
" terminal")
1105
parser.add_option("--priority", type="string", help="GnuTLS"
1106
" priority string (see GnuTLS documentation)")
1107
parser.add_option("--servicename", type="string", metavar="NAME",
1108
help="Zeroconf service name")
1109
parser.add_option("--configdir", type="string",
1110
default="/etc/mandos", metavar="DIR",
1111
help="Directory to search for configuration"
1112
" files")
1113
parser.add_option("--no-dbus", action="store_false",
1114
dest="use_dbus",
1115
help="Do not provide D-Bus system bus"
1116
" interface")
1117
parser.add_option("--no-ipv6", action="store_false",
1118
dest="use_ipv6", help="Do not use IPv6")
1119
options = parser.parse_args()[0]
587
parser.add_option("--debug", action="store_true", default=False,
588
help="Debug mode")
589
(options, args) = parser.parse_args()
1120
590
1121
591
if options.check:
1122
592
import doctest
1123
593
doctest.testmod()
1124
594
sys.exit()
1125
595
1126
# Default values for config file for server-global settings
1127
server_defaults = { "interface": "",
1128
"address": "",
1129
"port": "",
1130
"debug": "False",
1131
"priority":
1132
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
1133
"servicename": "Mandos",
1134
"use_dbus": "True",
1135
"use_ipv6": "True",
1136
}
1137
1138
# Parse config file for server-global settings
1139
server_config = ConfigParser.SafeConfigParser(server_defaults)
1140
del server_defaults
1141
server_config.read(os.path.join(options.configdir, "mandos.conf"))
1142
# Convert the SafeConfigParser object to a dict
1143
server_settings = server_config.defaults()
1144
# Use the appropriate methods on the non-string config options
1145
server_settings["debug"] = server_config.getboolean("DEFAULT",
1146
"debug")
1147
server_settings["use_dbus"] = server_config.getboolean("DEFAULT",
1148
"use_dbus")
1149
server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",
1150
"use_ipv6")
1151
if server_settings["port"]:
1152
server_settings["port"] = server_config.getint("DEFAULT",
1153
"port")
1154
del server_config
1155
1156
# Override the settings from the config file with command line
1157
# options, if set.
1158
for option in ("interface", "address", "port", "debug",
1159
"priority", "servicename", "configdir",
1160
"use_dbus", "use_ipv6"):
1161
value = getattr(options, option)
1162
if value is not None:
1163
server_settings[option] = value
1164
del options
1165
# Now we have our good server settings in "server_settings"
1166
1167
##################################################################
1168
1169
# For convenience
1170
debug = server_settings["debug"]
1171
use_dbus = server_settings["use_dbus"]
1172
use_ipv6 = server_settings["use_ipv6"]
1173
1174
if not debug:
1175
syslogger.setLevel(logging.WARNING)
1176
console.setLevel(logging.WARNING)
1177
1178
if server_settings["servicename"] != "Mandos":
1179
syslogger.setFormatter(logging.Formatter
1180
('Mandos (%s) [%%(process)d]:'
1181
' %%(levelname)s: %%(message)s'
1182
% server_settings["servicename"]))
1183
1184
# Parse config file with clients
1185
client_defaults = { "timeout": "1h",
1186
"interval": "5m",
1187
"checker": "fping -q -- %%(host)s",
1188
"host": "",
1189
}
1190
client_config = ConfigParser.SafeConfigParser(client_defaults)
1191
client_config.read(os.path.join(server_settings["configdir"],
1192
"clients.conf"))
1193
1194
global mandos_dbus_service
1195
mandos_dbus_service = None
1196
1197
clients = Set()
1198
tcp_server = IPv6_TCPServer((server_settings["address"],
1199
server_settings["port"]),
1200
TCP_handler,
1201
settings=server_settings,
1202
clients=clients, use_ipv6=use_ipv6)
1203
pidfilename = "/var/run/mandos.pid"
1204
try:
1205
pidfile = open(pidfilename, "w")
1206
except IOError:
1207
logger.error("Could not open file %r", pidfilename)
1208
1209
try:
1210
uid = pwd.getpwnam("_mandos").pw_uid
1211
gid = pwd.getpwnam("_mandos").pw_gid
1212
except KeyError:
1213
try:
1214
uid = pwd.getpwnam("mandos").pw_uid
1215
gid = pwd.getpwnam("mandos").pw_gid
1216
except KeyError:
1217
try:
1218
uid = pwd.getpwnam("nobody").pw_uid
1219
gid = pwd.getpwnam("nogroup").pw_gid
1220
except KeyError:
1221
uid = 65534
1222
gid = 65534
1223
try:
1224
os.setgid(gid)
1225
os.setuid(uid)
1226
except OSError, error:
1227
if error[0] != errno.EPERM:
1228
raise error
1229
1230
# Enable all possible GnuTLS debugging
1231
if debug:
1232
# "Use a log level over 10 to enable all debugging options."
1233
# - GnuTLS manual
1234
gnutls.library.functions.gnutls_global_set_log_level(11)
1235
1236
@gnutls.library.types.gnutls_log_func
1237
def debug_gnutls(level, string):
1238
logger.debug("GnuTLS: %s", string[:-1])
1239
1240
(gnutls.library.functions
1241
.gnutls_global_set_log_function(debug_gnutls))
1242
1243
global service
1244
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
1245
service = AvahiService(name = server_settings["servicename"],
1246
servicetype = "_mandos._tcp",
1247
protocol = protocol)
1248
if server_settings["interface"]:
1249
service.interface = (if_nametoindex
1250
(server_settings["interface"]))
1251
1252
global main_loop
1253
global bus
1254
global server
1255
# From the Avahi example code
596
# Parse the time arguments
597
try:
598
options.timeout = string_to_delta(options.timeout)
599
except ValueError:
600
parser.error("option --timeout: Unparseable time")
601
try:
602
options.interval = string_to_delta(options.interval)
603
except ValueError:
604
parser.error("option --interval: Unparseable time")
605
606
# Parse config file
607
defaults = { "checker": "fping -q -- %%(fqdn)s" }
608
client_config = ConfigParser.SafeConfigParser(defaults)
609
#client_config.readfp(open("secrets.conf"), "secrets.conf")
610
client_config.read("mandos-clients.conf")
611
612
# From the Avahi server example code
1256
613
DBusGMainLoop(set_as_default=True )
1257
614
main_loop = gobject.MainLoop()
1258
615
bus = dbus.SystemBus()
1259
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
1260
avahi.DBUS_PATH_SERVER),
1261
avahi.DBUS_INTERFACE_SERVER)
616
server = dbus.Interface(
617
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
618
avahi.DBUS_INTERFACE_SERVER )
1262
619
# End of Avahi example code
1263
if use_dbus:
1264
bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)
1265
620
1266
client_class = Client
1267
if use_dbus:
1268
client_class = ClientDBus
1269
clients.update(Set(
1270
client_class(name = section,
1271
config= dict(client_config.items(section)))
1272
for section in client_config.sections()))
1273
if not clients:
1274
logger.warning(u"No clients defined")
621
debug = options.debug
1275
622
1276
623
if debug:
1277
# Redirect stdin so all checkers get /dev/null
1278
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
1279
os.dup2(null, sys.stdin.fileno())
1280
if null > 2:
1281
os.close(null)
1282
else:
1283
# No console logging
1284
logger.removeHandler(console)
1285
# Close all input and output, do double fork, etc.
1286
daemon()
1287
1288
try:
1289
with closing(pidfile):
1290
pid = os.getpid()
1291
pidfile.write(str(pid) + "\n")
1292
del pidfile
1293
except IOError:
1294
logger.error(u"Could not write to file %r with PID %d",
1295
pidfilename, pid)
1296
except NameError:
1297
# "pidfile" was never created
1298
pass
1299
del pidfilename
624
console = logging.StreamHandler()
625
# console.setLevel(logging.DEBUG)
626
console.setFormatter(logging.Formatter\
627
('%(levelname)s: %(message)s'))
628
logger.addHandler(console)
629
del console
630
631
clients = Set()
632
def remove_from_clients(client):
633
clients.remove(client)
634
if not clients:
635
logger.debug(u"No clients left, exiting")
636
killme()
637
638
clients.update(Set(Client(name=section, options=options,
639
stop_hook = remove_from_clients,
640
**(dict(client_config\
641
.items(section))))
642
for section in client_config.sections()))
643
644
if not debug:
645
daemon(False, False)
1300
646
1301
647
def cleanup():
1302
648
"Cleanup function; run on exit"
1303
649
global group
1304
# From the Avahi example code
650
# From the Avahi server example code
1305
651
if not group is None:
1306
652
group.Free()
1307
653
group = None
1308
654
# End of Avahi example code
1309
655
1310
while clients:
1311
client = clients.pop()
1312
client.disable_hook = None
1313
client.disable()
656
for client in clients:
657
client.stop_hook = None
658
client.stop()
1314
659
1315
660
atexit.register(cleanup)
1316
661
1317
662
if not debug:
1318
663
signal.signal(signal.SIGINT, signal.SIG_IGN)
1319
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
1320
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
1321
1322
if use_dbus:
1323
class MandosDBusService(dbus.service.Object):
1324
"""A D-Bus proxy object"""
1325
def __init__(self):
1326
dbus.service.Object.__init__(self, bus, "/")
1327
_interface = u"se.bsnet.fukt.Mandos"
1328
1329
@dbus.service.signal(_interface, signature="oa{sv}")
1330
def ClientAdded(self, objpath, properties):
1331
"D-Bus signal"
1332
pass
1333
1334
@dbus.service.signal(_interface, signature="s")
1335
def ClientNotFound(self, fingerprint):
1336
"D-Bus signal"
1337
pass
1338
1339
@dbus.service.signal(_interface, signature="os")
1340
def ClientRemoved(self, objpath, name):
1341
"D-Bus signal"
1342
pass
1343
1344
@dbus.service.method(_interface, out_signature="ao")
1345
def GetAllClients(self):
1346
"D-Bus method"
1347
return dbus.Array(c.dbus_object_path for c in clients)
1348
1349
@dbus.service.method(_interface, out_signature="a{oa{sv}}")
1350
def GetAllClientsWithProperties(self):
1351
"D-Bus method"
1352
return dbus.Dictionary(
1353
((c.dbus_object_path, c.GetAllProperties())
1354
for c in clients),
1355
signature="oa{sv}")
1356
1357
@dbus.service.method(_interface, in_signature="o")
1358
def RemoveClient(self, object_path):
1359
"D-Bus method"
1360
for c in clients:
1361
if c.dbus_object_path == object_path:
1362
clients.remove(c)
1363
c.remove_from_connection()
1364
# Don't signal anything except ClientRemoved
1365
c.disable(signal=False)
1366
# Emit D-Bus signal
1367
self.ClientRemoved(object_path, c.name)
1368
return
1369
raise KeyError
1370
1371
del _interface
1372
1373
mandos_dbus_service = MandosDBusService()
664
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
665
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
1374
666
1375
667
for client in clients:
1376
if use_dbus:
1377
# Emit D-Bus signal
1378
mandos_dbus_service.ClientAdded(client.dbus_object_path,
1379
client.GetAllProperties())
1380
client.enable()
1381
1382
tcp_server.enable()
1383
tcp_server.server_activate()
1384
1385
# Find out what port we got
1386
service.port = tcp_server.socket.getsockname()[1]
1387
if use_ipv6:
1388
logger.info(u"Now listening on address %r, port %d,"
1389
" flowinfo %d, scope_id %d"
1390
% tcp_server.socket.getsockname())
1391
else: # IPv4
1392
logger.info(u"Now listening on address %r, port %d"
1393
% tcp_server.socket.getsockname())
1394
1395
#service.interface = tcp_server.socket.getsockname()[3]
1396
1397
try:
1398
# From the Avahi example code
1399
server.connect_to_signal("StateChanged", server_state_changed)
1400
try:
1401
server_state_changed(server.GetState())
1402
except dbus.exceptions.DBusException, error:
1403
logger.critical(u"DBusException: %s", error)
1404
sys.exit(1)
1405
# End of Avahi example code
1406
1407
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
1408
lambda *args, **kwargs:
1409
(tcp_server.handle_request
1410
(*args[2:], **kwargs) or True))
1411
1412
logger.debug(u"Starting main loop")
668
client.start()
669
670
tcp_server = IPv6_TCPServer((None, options.port),
671
tcp_handler,
672
options=options,
673
clients=clients)
674
# Find out what random port we got
675
servicePort = tcp_server.socket.getsockname()[1]
676
logger.debug(u"Now listening on port %d", servicePort)
677
678
if options.interface is not None:
679
serviceInterface = if_nametoindex(options.interface)
680
681
# From the Avahi server example code
682
server.connect_to_signal("StateChanged", server_state_changed)
683
try:
684
server_state_changed(server.GetState())
685
except dbus.exceptions.DBusException, error:
686
logger.critical(u"DBusException: %s", error)
687
killme(1)
688
# End of Avahi example code
689
690
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
691
lambda *args, **kwargs:
692
tcp_server.handle_request(*args[2:],
693
**kwargs) or True)
694
try:
695
main_loop_started = True
1413
696
main_loop.run()
1414
except AvahiError, error:
1415
logger.critical(u"AvahiError: %s", error)
1416
sys.exit(1)
1417
697
except KeyboardInterrupt:
1418
698
if debug:
1419
print >> sys.stderr
1420
logger.debug("Server received KeyboardInterrupt")
1421
logger.debug("Server exiting")
1422
1423
if __name__ == '__main__':
1424
main()
699
print
700
701
sys.exit(exitstatus)
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Version: 2.0.2.dev0