To get this branch, use:
bzr branch
http://bzr.recompile.se/loggerhead/mandos/release
« back to all changes in this revision
Viewing changes to server.py
- browse files at revision 24.1.3
- compare with another revision
- download diff
- download tarball
- view history from revision 24.1.3
- Committer: Björn Påhlsson
- Date: 2008-07-22 06:27:12 UTC
- mfrom: (27 mandos)
- mto: (237.7.1 mandos) (24.1.154 mandos)
- mto: This revision was merged to the branch mainline in revision 30.
- Revision ID: belorn@braxen-20080722062712-akkycfgee7pn5syr
merge
- 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
6
6
# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
8
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".
9
# following functions: "add_service", "remove_service",
10
# "server_state_changed", "entry_group_state_changed", and some lines
11
# in "main".
12
12
#
13
# Everything else is
14
# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
13
# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
14
# Påhlsson.
15
15
#
16
16
# This program is free software: you can redistribute it and/or modify
17
17
# it under the terms of the GNU General Public License as published by
24
24
# GNU General Public License for more details.
25
25
#
26
26
# You should have received a copy of the GNU General Public License
27
# along with this program. If not, see
28
# <http://www.gnu.org/licenses/>.
27
# along with this program. If not, see <http://www.gnu.org/licenses/>.
29
28
#
30
# Contact the authors at <mandos@fukt.bsnet.se>.
29
# Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
30
# <https://www.fukt.bsnet.se/~teddy/>.
31
31
#
32
32
33
33
from __future__ import division
34
34
35
35
import SocketServer
36
36
import socket
37
import select
37
38
from optparse import OptionParser
38
39
import datetime
39
40
import errno
54
55
import stat
55
56
import logging
56
57
import logging.handlers
57
import pwd
58
58
59
59
import dbus
60
60
import gobject
61
61
import avahi
62
62
from dbus.mainloop.glib import DBusGMainLoop
63
63
import ctypes
64
import ctypes.util
65
66
version = "1.0"
64
65
# Brief description of the operation of this program:
66
#
67
# This server announces itself as a Zeroconf service. Connecting
68
# clients use the TLS protocol, with the unusual quirk that this
69
# server program acts as a TLS "client" while the connecting clients
70
# acts as a TLS "server". The clients (acting as a TLS "server") must
71
# supply an OpenPGP certificate, and the fingerprint of this
72
# certificate is used by this server to look up (in a list read from a
73
# file at start time) which binary blob to give the client. No other
74
# authentication or authorization is done by this server.
75
67
76
68
77
logger = logging.Logger('mandos')
69
78
syslogger = logging.handlers.SysLogHandler\
70
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
address = "/dev/log")
79
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
72
80
syslogger.setFormatter(logging.Formatter\
73
('Mandos: %(levelname)s: %(message)s'))
81
('%(levelname)s: %(message)s'))
74
82
logger.addHandler(syslogger)
75
76
console = logging.StreamHandler()
77
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
' %(message)s'))
79
logger.addHandler(console)
80
81
class AvahiError(Exception):
82
def __init__(self, value):
83
self.value = value
84
super(AvahiError, self).__init__()
85
def __str__(self):
86
return repr(self.value)
87
88
class AvahiServiceError(AvahiError):
89
pass
90
91
class AvahiGroupError(AvahiError):
92
pass
93
94
95
class AvahiService(object):
96
"""An Avahi (Zeroconf) service.
97
Attributes:
98
interface: integer; avahi.IF_UNSPEC or an interface index.
99
Used to optionally bind to the specified interface.
100
name: string; Example: 'Mandos'
101
type: string; Example: '_mandos._tcp'.
102
See <http://www.dns-sd.org/ServiceTypes.html>
103
port: integer; what port to announce
104
TXT: list of strings; TXT record for the service
105
domain: string; Domain to publish on, default to .local if empty.
106
host: string; Host to publish records for, default is localhost
107
max_renames: integer; maximum number of renames
108
rename_count: integer; counter so we only rename after collisions
109
a sensible number of times
110
"""
111
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
112
servicetype = None, port = None, TXT = None, domain = "",
113
host = "", max_renames = 32768):
114
self.interface = interface
115
self.name = name
116
self.type = servicetype
117
self.port = port
118
if TXT is None:
119
self.TXT = []
120
else:
121
self.TXT = TXT
122
self.domain = domain
123
self.host = host
124
self.rename_count = 0
125
self.max_renames = max_renames
126
def rename(self):
127
"""Derived from the Avahi example code"""
128
if self.rename_count >= self.max_renames:
129
logger.critical(u"No suitable Zeroconf service name found"
130
u" after %i retries, exiting.",
131
self.rename_count)
132
raise AvahiServiceError("Too many renames")
133
self.name = server.GetAlternativeServiceName(self.name)
134
logger.info(u"Changing Zeroconf service name to %r ...",
135
str(self.name))
136
syslogger.setFormatter(logging.Formatter\
137
('Mandos (%s): %%(levelname)s:'
138
' %%(message)s' % self.name))
139
self.remove()
140
self.add()
141
self.rename_count += 1
142
def remove(self):
143
"""Derived from the Avahi example code"""
144
if group is not None:
145
group.Reset()
146
def add(self):
147
"""Derived from the Avahi example code"""
148
global group
149
if group is None:
150
group = dbus.Interface\
151
(bus.get_object(avahi.DBUS_NAME,
152
server.EntryGroupNew()),
153
avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
group.connect_to_signal('StateChanged',
155
entry_group_state_changed)
156
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
service.name, service.type)
158
group.AddService(
159
self.interface, # interface
160
avahi.PROTO_INET6, # protocol
161
dbus.UInt32(0), # flags
162
self.name, self.type,
163
self.domain, self.host,
164
dbus.UInt16(self.port),
165
avahi.string_array_to_txt_array(self.TXT))
166
group.Commit()
167
83
del syslogger
84
85
# This variable is used to optionally bind to a specified interface.
86
# It is a global variable to fit in with the other variables from the
87
# Avahi example code.
88
serviceInterface = avahi.IF_UNSPEC
168
89
# From the Avahi example code:
169
group = None # our entry group
90
serviceName = None
91
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
92
servicePort = None # Not known at startup
93
serviceTXT = [] # TXT record for the service
94
domain = "" # Domain to publish on, default to .local
95
host = "" # Host to publish records for, default to localhost
96
group = None #our entry group
97
rename_count = 12 # Counter so we only rename after collisions a
98
# sensible number of times
170
99
# End of Avahi example code
171
100
172
101
177
106
fingerprint: string (40 or 32 hexadecimal digits); used to
178
107
uniquely identify the client
179
108
secret: bytestring; sent verbatim (over TLS) to client
180
host: string; available for use by the checker command
181
created: datetime.datetime(); object creation, not client host
182
last_checked_ok: datetime.datetime() or None if not yet checked OK
183
timeout: datetime.timedelta(); How long from last_checked_ok
184
until this client is invalid
109
fqdn: string (FQDN); available for use by the checker command
110
created: datetime.datetime()
111
last_seen: datetime.datetime() or None if not yet seen
112
timeout: datetime.timedelta(); How long from last_seen until
113
this client is invalid
185
114
interval: datetime.timedelta(); How often to start a new checker
186
115
stop_hook: If set, called by stop() as stop_hook(self)
187
116
checker: subprocess.Popen(); a running checker process used
188
117
to see if the client lives.
189
'None' if no process is running.
118
Is None if no process is running.
190
119
checker_initiator_tag: a gobject event source tag, or None
191
120
stop_initiator_tag: - '' -
192
121
checker_callback_tag: - '' -
193
122
checker_command: string; External command which is run to check if
194
client lives. %() expansions are done at
123
client lives. %()s expansions are done at
195
124
runtime with vars(self) as dict, so that for
196
125
instance %(name)s can be used in the command.
197
126
Private attibutes:
198
127
_timeout: Real variable for 'timeout'
199
128
_interval: Real variable for 'interval'
200
_timeout_milliseconds: Used when calling gobject.timeout_add()
129
_timeout_milliseconds: Used by gobject.timeout_add()
201
130
_interval_milliseconds: - '' -
202
131
"""
203
132
def _set_timeout(self, timeout):
223
152
interval = property(lambda self: self._interval,
224
153
_set_interval)
225
154
del _set_interval
226
def __init__(self, name = None, stop_hook=None, config=None):
227
"""Note: the 'checker' key in 'config' sets the
228
'checker_command' attribute and *not* the 'checker'
229
attribute."""
230
if config is None:
231
config = {}
155
def __init__(self, name=None, stop_hook=None, fingerprint=None,
156
secret=None, secfile=None, fqdn=None, timeout=None,
157
interval=-1, checker=None):
158
"""Note: the 'checker' argument sets the 'checker_command'
159
attribute and not the 'checker' attribute.."""
232
160
self.name = name
233
161
logger.debug(u"Creating client %r", self.name)
234
# Uppercase and remove spaces from fingerprint for later
235
# comparison purposes with return value from the fingerprint()
236
# function
237
self.fingerprint = config["fingerprint"].upper()\
238
.replace(u" ", u"")
162
# Uppercase and remove spaces from fingerprint
163
# for later comparison purposes with return value of
164
# the fingerprint() function
165
self.fingerprint = fingerprint.upper().replace(u" ", u"")
239
166
logger.debug(u" Fingerprint: %s", self.fingerprint)
240
if "secret" in config:
241
self.secret = config["secret"].decode(u"base64")
242
elif "secfile" in config:
243
secfile = open(config["secfile"])
244
self.secret = secfile.read()
245
secfile.close()
167
if secret:
168
self.secret = secret.decode(u"base64")
169
elif secfile:
170
sf = open(secfile)
171
self.secret = sf.read()
172
sf.close()
246
173
else:
247
raise TypeError(u"No secret or secfile for client %s"
248
% self.name)
249
self.host = config.get("host", "")
174
raise RuntimeError(u"No secret or secfile for client %s"
175
% self.name)
176
self.fqdn = fqdn # string
250
177
self.created = datetime.datetime.now()
251
self.last_checked_ok = None
252
self.timeout = string_to_delta(config["timeout"])
253
self.interval = string_to_delta(config["interval"])
178
self.last_seen = None
179
self.timeout = string_to_delta(timeout)
180
self.interval = string_to_delta(interval)
254
181
self.stop_hook = stop_hook
255
182
self.checker = None
256
183
self.checker_initiator_tag = None
257
184
self.stop_initiator_tag = None
258
185
self.checker_callback_tag = None
259
self.check_command = config["checker"]
186
self.check_command = checker
260
187
def start(self):
261
188
"""Start this client's checker and timeout hooks"""
262
189
# Schedule a new checker to be started an 'interval' from now,
272
199
self.stop)
273
200
def stop(self):
274
201
"""Stop this client.
275
The possibility that a client might be restarted is left open,
276
but not currently used."""
202
The possibility that this client might be restarted is left
203
open, but not currently used."""
277
204
# If this client doesn't have a secret, it is already stopped.
278
if hasattr(self, "secret") and self.secret:
279
logger.info(u"Stopping client %s", self.name)
205
if self.secret:
206
logger.debug(u"Stopping client %s", self.name)
280
207
self.secret = None
281
208
else:
282
209
return False
283
if getattr(self, "stop_initiator_tag", False):
210
if hasattr(self, "stop_initiator_tag") \
211
and self.stop_initiator_tag:
284
212
gobject.source_remove(self.stop_initiator_tag)
285
213
self.stop_initiator_tag = None
286
if getattr(self, "checker_initiator_tag", False):
214
if hasattr(self, "checker_initiator_tag") \
215
and self.checker_initiator_tag:
287
216
gobject.source_remove(self.checker_initiator_tag)
288
217
self.checker_initiator_tag = None
289
218
self.stop_checker()
301
230
self.checker = None
302
231
if os.WIFEXITED(condition) \
303
232
and (os.WEXITSTATUS(condition) == 0):
304
logger.info(u"Checker for %(name)s succeeded",
305
vars(self))
306
self.last_checked_ok = now
233
logger.debug(u"Checker for %(name)s succeeded",
234
vars(self))
235
self.last_seen = now
307
236
gobject.source_remove(self.stop_initiator_tag)
308
237
self.stop_initiator_tag = gobject.timeout_add\
309
238
(self._timeout_milliseconds,
312
241
logger.warning(u"Checker for %(name)s crashed?",
313
242
vars(self))
314
243
else:
315
logger.info(u"Checker for %(name)s failed",
316
vars(self))
244
logger.debug(u"Checker for %(name)s failed",
245
vars(self))
317
246
def start_checker(self):
318
247
"""Start a new checker subprocess if one is not running.
319
248
If a checker already exists, leave it running and do
328
257
# is as it should be.
329
258
if self.checker is None:
330
259
try:
331
# In case check_command has exactly one % operator
332
command = self.check_command % self.host
260
command = self.check_command % self.fqdn
333
261
except TypeError:
334
# Escape attributes for the shell
335
262
escaped_attrs = dict((key, re.escape(str(val)))
336
263
for key, val in
337
264
vars(self).iteritems())
338
265
try:
339
266
command = self.check_command % escaped_attrs
340
267
except TypeError, error:
341
logger.error(u'Could not format string "%s":'
342
u' %s', self.check_command, error)
268
logger.critical(u'Could not format string "%s":'
269
u' %s', self.check_command, error)
343
270
return True # Try again later
344
271
try:
345
logger.info(u"Starting checker %r for %s",
346
command, self.name)
347
# We don't need to redirect stdout and stderr, since
348
# in normal mode, that is already done by daemon(),
349
# and in debug mode we don't want to. (Stdin is
350
# always replaced by /dev/null.)
351
self.checker = subprocess.Popen(command,
352
close_fds=True,
353
shell=True, cwd="/")
272
logger.debug(u"Starting checker %r for %s",
273
command, self.name)
274
self.checker = subprocess.\
275
Popen(command,
276
close_fds=True, shell=True,
277
cwd="/")
354
278
self.checker_callback_tag = gobject.child_watch_add\
355
279
(self.checker.pid,
356
280
self.checker_callback)
357
except OSError, error:
281
except subprocess.OSError, error:
358
282
logger.error(u"Failed to start subprocess: %s",
359
283
error)
360
284
# Re-run this periodically if run by gobject.timeout_add
364
288
if self.checker_callback_tag:
365
289
gobject.source_remove(self.checker_callback_tag)
366
290
self.checker_callback_tag = None
367
if getattr(self, "checker", None) is None:
291
if not hasattr(self, "checker") or self.checker is None:
368
292
return
369
logger.debug(u"Stopping checker for %(name)s", vars(self))
293
logger.debug("Stopping checker for %(name)s", vars(self))
370
294
try:
371
295
os.kill(self.checker.pid, signal.SIGTERM)
372
296
#os.sleep(0.5)
373
297
#if self.checker.poll() is None:
374
298
# os.kill(self.checker.pid, signal.SIGKILL)
375
299
except OSError, error:
376
if error.errno != errno.ESRCH: # No such process
300
if error.errno != errno.ESRCH:
377
301
raise
378
302
self.checker = None
379
def still_valid(self):
303
def still_valid(self, now=None):
380
304
"""Has the timeout not yet passed for this client?"""
381
now = datetime.datetime.now()
382
if self.last_checked_ok is None:
305
if now is None:
306
now = datetime.datetime.now()
307
if self.last_seen is None:
383
308
return now < (self.created + self.timeout)
384
309
else:
385
return now < (self.last_checked_ok + self.timeout)
310
return now < (self.last_seen + self.timeout)
386
311
387
312
388
313
def peer_certificate(session):
404
329
405
330
def fingerprint(openpgp):
406
331
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
332
# New empty GnuTLS certificate
333
crt = gnutls.library.types.gnutls_openpgp_crt_t()
334
gnutls.library.functions.gnutls_openpgp_crt_init\
335
(ctypes.byref(crt))
407
336
# New GnuTLS "datum" with the OpenPGP public key
408
337
datum = gnutls.library.types.gnutls_datum_t\
409
338
(ctypes.cast(ctypes.c_char_p(openpgp),
410
339
ctypes.POINTER(ctypes.c_ubyte)),
411
340
ctypes.c_uint(len(openpgp)))
412
# New empty GnuTLS certificate
413
crt = gnutls.library.types.gnutls_openpgp_crt_t()
414
gnutls.library.functions.gnutls_openpgp_crt_init\
415
(ctypes.byref(crt))
416
341
# Import the OpenPGP public key into the certificate
417
gnutls.library.functions.gnutls_openpgp_crt_import\
418
(crt, ctypes.byref(datum),
419
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
420
# Verify the self signature in the key
421
crtverify = ctypes.c_uint()
422
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
423
(crt, 0, ctypes.byref(crtverify))
424
if crtverify.value != 0:
425
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
426
raise gnutls.errors.CertificateSecurityError("Verify failed")
342
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
343
(crt,
344
ctypes.byref(datum),
345
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
427
346
# New buffer for the fingerprint
428
buf = ctypes.create_string_buffer(20)
429
buf_len = ctypes.c_size_t()
347
buffer = ctypes.create_string_buffer(20)
348
buffer_length = ctypes.c_size_t()
430
349
# Get the fingerprint from the certificate into the buffer
431
350
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
432
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
351
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
433
352
# Deinit the certificate
434
353
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
435
354
# Convert the buffer to a Python bytestring
436
fpr = ctypes.string_at(buf, buf_len.value)
355
fpr = ctypes.string_at(buffer, buffer_length.value)
437
356
# Convert the bytestring to hexadecimal notation
438
357
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
439
358
return hex_fpr
440
359
441
360
442
class TCP_handler(SocketServer.BaseRequestHandler, object):
361
class tcp_handler(SocketServer.BaseRequestHandler, object):
443
362
"""A TCP request handler class.
444
363
Instantiated by IPv6_TCPServer for each request to handle it.
445
364
Note: This will run in its own forked process."""
446
365
447
366
def handle(self):
448
logger.info(u"TCP connection from: %s",
367
logger.debug(u"TCP connection from: %s",
449
368
unicode(self.client_address))
450
session = gnutls.connection.ClientSession\
451
(self.request, gnutls.connection.X509Credentials())
452
453
line = self.request.makefile().readline()
454
logger.debug(u"Protocol version: %r", line)
455
try:
456
if int(line.strip().split()[0]) > 1:
457
raise RuntimeError
458
except (ValueError, IndexError, RuntimeError), error:
459
logger.error(u"Unknown protocol version: %s", error)
460
return
461
462
# Note: gnutls.connection.X509Credentials is really a generic
463
# GnuTLS certificate credentials object so long as no X.509
464
# keys are added to it. Therefore, we can use it here despite
465
# using OpenPGP certificates.
369
session = gnutls.connection.ClientSession(self.request,
370
gnutls.connection.\
371
X509Credentials())
466
372
467
373
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
468
374
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
469
375
# "+DHE-DSS"))
470
priority = "NORMAL" # Fallback default, since this
471
# MUST be set.
472
if self.server.settings["priority"]:
473
priority = self.server.settings["priority"]
376
priority = "NORMAL"
377
if self.server.options.priority:
378
priority = self.server.options.priority
474
379
gnutls.library.functions.gnutls_priority_set_direct\
475
(session._c_object, priority, None)
380
(session._c_object, priority, None);
476
381
477
382
try:
478
383
session.handshake()
479
384
except gnutls.errors.GNUTLSError, error:
480
logger.warning(u"Handshake failed: %s", error)
385
logger.debug(u"Handshake failed: %s", error)
481
386
# Do not run session.bye() here: the session is not
482
387
# established. Just abandon the request.
483
388
return
484
389
try:
485
390
fpr = fingerprint(peer_certificate(session))
486
391
except (TypeError, gnutls.errors.GNUTLSError), error:
487
logger.warning(u"Bad certificate: %s", error)
392
logger.debug(u"Bad certificate: %s", error)
488
393
session.bye()
489
394
return
490
395
logger.debug(u"Fingerprint: %s", fpr)
493
398
if c.fingerprint == fpr:
494
399
client = c
495
400
break
496
if not client:
497
logger.warning(u"Client not found for fingerprint: %s",
498
fpr)
499
session.bye()
500
return
501
401
# Have to check if client.still_valid(), since it is possible
502
402
# that the client timed out while establishing the GnuTLS
503
403
# session.
504
if not client.still_valid():
505
logger.warning(u"Client %(name)s is invalid",
506
vars(client))
404
if (not client) or (not client.still_valid()):
405
if client:
406
logger.debug(u"Client %(name)s is invalid",
407
vars(client))
408
else:
409
logger.debug(u"Client not found for fingerprint: %s",
410
fpr)
507
411
session.bye()
508
412
return
509
413
sent_size = 0
519
423
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
520
424
"""IPv6 TCP server. Accepts 'None' as address and/or port.
521
425
Attributes:
522
settings: Server settings
426
options: Command line options
523
427
clients: Set() of Client objects
524
enabled: Boolean; whether this server is activated yet
525
428
"""
526
429
address_family = socket.AF_INET6
527
430
def __init__(self, *args, **kwargs):
528
if "settings" in kwargs:
529
self.settings = kwargs["settings"]
530
del kwargs["settings"]
431
if "options" in kwargs:
432
self.options = kwargs["options"]
433
del kwargs["options"]
531
434
if "clients" in kwargs:
532
435
self.clients = kwargs["clients"]
533
436
del kwargs["clients"]
534
self.enabled = False
535
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
437
return super(type(self), self).__init__(*args, **kwargs)
536
438
def server_bind(self):
537
439
"""This overrides the normal server_bind() function
538
440
to bind to an interface if one was specified, and also NOT to
539
441
bind to an address or port if they were not specified."""
540
if self.settings["interface"]:
541
# 25 is from /usr/include/asm-i486/socket.h
542
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
442
if self.options.interface:
443
if not hasattr(socket, "SO_BINDTODEVICE"):
444
# From /usr/include/asm-i486/socket.h
445
socket.SO_BINDTODEVICE = 25
543
446
try:
544
447
self.socket.setsockopt(socket.SOL_SOCKET,
545
SO_BINDTODEVICE,
546
self.settings["interface"])
448
socket.SO_BINDTODEVICE,
449
self.options.interface)
547
450
except socket.error, error:
548
451
if error[0] == errno.EPERM:
549
logger.error(u"No permission to"
550
u" bind to interface %s",
551
self.settings["interface"])
452
logger.warning(u"No permission to"
453
u" bind to interface %s",
454
self.options.interface)
552
455
else:
553
456
raise error
554
457
# Only bind(2) the socket if we really need to.
557
460
in6addr_any = "::"
558
461
self.server_address = (in6addr_any,
559
462
self.server_address[1])
560
elif not self.server_address[1]:
463
elif self.server_address[1] is None:
561
464
self.server_address = (self.server_address[0],
562
465
0)
563
# if self.settings["interface"]:
564
# self.server_address = (self.server_address[0],
565
# 0, # port
566
# 0, # flowinfo
567
# if_nametoindex
568
# (self.settings
569
# ["interface"]))
570
return super(IPv6_TCPServer, self).server_bind()
571
def server_activate(self):
572
if self.enabled:
573
return super(IPv6_TCPServer, self).server_activate()
574
def enable(self):
575
self.enabled = True
466
return super(type(self), self).server_bind()
576
467
577
468
578
469
def string_to_delta(interval):
588
479
datetime.timedelta(1)
589
480
>>> string_to_delta(u'1w')
590
481
datetime.timedelta(7)
591
>>> string_to_delta('5m 30s')
592
datetime.timedelta(0, 330)
593
482
"""
594
timevalue = datetime.timedelta(0)
595
for s in interval.split():
596
try:
597
suffix = unicode(s[-1])
598
value = int(s[:-1])
599
if suffix == u"d":
600
delta = datetime.timedelta(value)
601
elif suffix == u"s":
602
delta = datetime.timedelta(0, value)
603
elif suffix == u"m":
604
delta = datetime.timedelta(0, 0, 0, 0, value)
605
elif suffix == u"h":
606
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
607
elif suffix == u"w":
608
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
609
else:
610
raise ValueError
611
except (ValueError, IndexError):
483
try:
484
suffix=unicode(interval[-1])
485
value=int(interval[:-1])
486
if suffix == u"d":
487
delta = datetime.timedelta(value)
488
elif suffix == u"s":
489
delta = datetime.timedelta(0, value)
490
elif suffix == u"m":
491
delta = datetime.timedelta(0, 0, 0, 0, value)
492
elif suffix == u"h":
493
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
494
elif suffix == u"w":
495
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
496
else:
612
497
raise ValueError
613
timevalue += delta
614
return timevalue
498
except (ValueError, IndexError):
499
raise ValueError
500
return delta
501
502
503
def add_service():
504
"""Derived from the Avahi example code"""
505
global group, serviceName, serviceType, servicePort, serviceTXT, \
506
domain, host
507
if group is None:
508
group = dbus.Interface(
509
bus.get_object( avahi.DBUS_NAME,
510
server.EntryGroupNew()),
511
avahi.DBUS_INTERFACE_ENTRY_GROUP)
512
group.connect_to_signal('StateChanged',
513
entry_group_state_changed)
514
logger.debug(u"Adding service '%s' of type '%s' ...",
515
serviceName, serviceType)
516
517
group.AddService(
518
serviceInterface, # interface
519
avahi.PROTO_INET6, # protocol
520
dbus.UInt32(0), # flags
521
serviceName, serviceType,
522
domain, host,
523
dbus.UInt16(servicePort),
524
avahi.string_array_to_txt_array(serviceTXT))
525
group.Commit()
526
527
528
def remove_service():
529
"""From the Avahi example code"""
530
global group
531
532
if not group is None:
533
group.Reset()
615
534
616
535
617
536
def server_state_changed(state):
618
537
"""Derived from the Avahi example code"""
619
538
if state == avahi.SERVER_COLLISION:
620
logger.error(u"Zeroconf server name collision")
621
service.remove()
539
logger.warning(u"Server name collision")
540
remove_service()
622
541
elif state == avahi.SERVER_RUNNING:
623
service.add()
542
add_service()
624
543
625
544
626
545
def entry_group_state_changed(state, error):
627
546
"""Derived from the Avahi example code"""
628
logger.debug(u"Avahi state change: %i", state)
547
global serviceName, server, rename_count
548
549
logger.debug(u"state change: %i", state)
629
550
630
551
if state == avahi.ENTRY_GROUP_ESTABLISHED:
631
logger.debug(u"Zeroconf service established.")
552
logger.debug(u"Service established.")
632
553
elif state == avahi.ENTRY_GROUP_COLLISION:
633
logger.warning(u"Zeroconf service name collision.")
634
service.rename()
554
555
rename_count = rename_count - 1
556
if rename_count > 0:
557
name = server.GetAlternativeServiceName(name)
558
logger.warning(u"Service name collision, "
559
u"changing name to '%s' ...", name)
560
remove_service()
561
add_service()
562
563
else:
564
logger.error(u"No suitable service name found after %i"
565
u" retries, exiting.", n_rename)
566
killme(1)
635
567
elif state == avahi.ENTRY_GROUP_FAILURE:
636
logger.critical(u"Avahi: Error in group state changed %s",
637
unicode(error))
638
raise AvahiGroupError("State changed: %s", str(error))
568
logger.error(u"Error in group state changed %s",
569
unicode(error))
570
killme(1)
571
639
572
640
573
def if_nametoindex(interface):
641
"""Call the C function if_nametoindex(), or equivalent"""
642
global if_nametoindex
574
"""Call the C function if_nametoindex()"""
643
575
try:
644
if_nametoindex = ctypes.cdll.LoadLibrary\
645
(ctypes.util.find_library("c")).if_nametoindex
576
libc = ctypes.cdll.LoadLibrary("libc.so.6")
577
return libc.if_nametoindex(interface)
646
578
except (OSError, AttributeError):
647
579
if "struct" not in sys.modules:
648
580
import struct
649
581
if "fcntl" not in sys.modules:
650
582
import fcntl
651
def if_nametoindex(interface):
652
"Get an interface index the hard way, i.e. using fcntl()"
653
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
654
s = socket.socket()
655
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
656
struct.pack("16s16x", interface))
657
s.close()
658
interface_index = struct.unpack("I", ifreq[16:20])[0]
659
return interface_index
660
return if_nametoindex(interface)
661
662
663
def daemon(nochdir = False, noclose = False):
583
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
584
s = socket.socket()
585
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
586
struct.pack("16s16x", interface))
587
s.close()
588
interface_index = struct.unpack("I", ifreq[16:20])[0]
589
return interface_index
590
591
592
def daemon(nochdir, noclose):
664
593
"""See daemon(3). Standard BSD Unix function.
665
594
This should really exist as os.daemon, but it doesn't (yet)."""
666
595
if os.fork():
668
597
os.setsid()
669
598
if not nochdir:
670
599
os.chdir("/")
671
if os.fork():
672
sys.exit()
673
600
if not noclose:
674
601
# Close all standard open file descriptors
675
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
602
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
676
603
if not stat.S_ISCHR(os.fstat(null).st_mode):
677
604
raise OSError(errno.ENODEV,
678
605
"/dev/null not a character device")
683
610
os.close(null)
684
611
685
612
613
def killme(status = 0):
614
logger.debug("Stopping server with exit status %d", status)
615
exitstatus = status
616
if main_loop_started:
617
main_loop.quit()
618
else:
619
sys.exit(status)
620
621
686
622
def main():
687
parser = OptionParser(version = "%%prog %s" % version)
623
global exitstatus
624
exitstatus = 0
625
global main_loop_started
626
main_loop_started = False
627
628
parser = OptionParser()
688
629
parser.add_option("-i", "--interface", type="string",
689
metavar="IF", help="Bind to interface IF")
690
parser.add_option("-a", "--address", type="string",
630
default=None, metavar="IF",
631
help="Bind to interface IF")
632
parser.add_option("-a", "--address", type="string", default=None,
691
633
help="Address to listen for requests on")
692
parser.add_option("-p", "--port", type="int",
634
parser.add_option("-p", "--port", type="int", default=None,
693
635
help="Port number to receive requests on")
694
636
parser.add_option("--check", action="store_true", default=False,
695
637
help="Run self-test")
696
parser.add_option("--debug", action="store_true",
697
help="Debug mode; run in foreground and log to"
698
" terminal")
699
parser.add_option("--priority", type="string", help="GnuTLS"
700
" priority string (see GnuTLS documentation)")
701
parser.add_option("--servicename", type="string", metavar="NAME",
702
help="Zeroconf service name")
703
parser.add_option("--configdir", type="string",
704
default="/etc/mandos", metavar="DIR",
705
help="Directory to search for configuration"
706
" files")
707
options = parser.parse_args()[0]
638
parser.add_option("--debug", action="store_true", default=False,
639
help="Debug mode")
640
parser.add_option("--priority", type="string",
641
default="SECURE256",
642
help="GnuTLS priority string"
643
" (see GnuTLS documentation)")
644
parser.add_option("--servicename", type="string",
645
default="Mandos", help="Zeroconf service name")
646
(options, args) = parser.parse_args()
708
647
709
648
if options.check:
710
649
import doctest
711
650
doctest.testmod()
712
651
sys.exit()
713
652
714
# Default values for config file for server-global settings
715
server_defaults = { "interface": "",
716
"address": "",
717
"port": "",
718
"debug": "False",
719
"priority":
720
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
721
"servicename": "Mandos",
722
}
723
724
# Parse config file for server-global settings
725
server_config = ConfigParser.SafeConfigParser(server_defaults)
726
del server_defaults
727
server_config.read(os.path.join(options.configdir, "mandos.conf"))
728
# Convert the SafeConfigParser object to a dict
729
server_settings = server_config.defaults()
730
# Use getboolean on the boolean config option
731
server_settings["debug"] = server_config.getboolean\
732
("DEFAULT", "debug")
733
del server_config
734
735
# Override the settings from the config file with command line
736
# options, if set.
737
for option in ("interface", "address", "port", "debug",
738
"priority", "servicename", "configdir"):
739
value = getattr(options, option)
740
if value is not None:
741
server_settings[option] = value
742
del options
743
# Now we have our good server settings in "server_settings"
744
745
debug = server_settings["debug"]
746
747
if not debug:
748
syslogger.setLevel(logging.WARNING)
749
console.setLevel(logging.WARNING)
750
751
if server_settings["servicename"] != "Mandos":
752
syslogger.setFormatter(logging.Formatter\
753
('Mandos (%s): %%(levelname)s:'
754
' %%(message)s'
755
% server_settings["servicename"]))
756
757
# Parse config file with clients
758
client_defaults = { "timeout": "1h",
759
"interval": "5m",
760
"checker": "fping -q -- %(host)s",
761
"host": "",
762
}
763
client_config = ConfigParser.SafeConfigParser(client_defaults)
764
client_config.read(os.path.join(server_settings["configdir"],
765
"clients.conf"))
766
767
clients = Set()
768
tcp_server = IPv6_TCPServer((server_settings["address"],
769
server_settings["port"]),
770
TCP_handler,
771
settings=server_settings,
772
clients=clients)
773
pidfilename = "/var/run/mandos.pid"
774
try:
775
pidfile = open(pidfilename, "w")
776
except IOError, error:
777
logger.error("Could not open file %r", pidfilename)
778
779
uid = 65534
780
gid = 65534
781
try:
782
uid = pwd.getpwnam("mandos").pw_uid
783
except KeyError:
784
try:
785
uid = pwd.getpwnam("nobody").pw_uid
786
except KeyError:
787
pass
788
try:
789
gid = pwd.getpwnam("mandos").pw_gid
790
except KeyError:
791
try:
792
gid = pwd.getpwnam("nogroup").pw_gid
793
except KeyError:
794
pass
795
try:
796
os.setuid(uid)
797
os.setgid(gid)
798
except OSError, error:
799
if error[0] != errno.EPERM:
800
raise error
801
802
global service
803
service = AvahiService(name = server_settings["servicename"],
804
servicetype = "_mandos._tcp", )
805
if server_settings["interface"]:
806
service.interface = if_nametoindex\
807
(server_settings["interface"])
653
# Parse config file
654
defaults = { "timeout": "1h",
655
"interval": "5m",
656
"checker": "fping -q -- %%(fqdn)s",
657
}
658
client_config = ConfigParser.SafeConfigParser(defaults)
659
#client_config.readfp(open("global.conf"), "global.conf")
660
client_config.read("mandos-clients.conf")
661
662
global serviceName
663
serviceName = options.servicename;
808
664
809
665
global main_loop
810
666
global bus
813
669
DBusGMainLoop(set_as_default=True )
814
670
main_loop = gobject.MainLoop()
815
671
bus = dbus.SystemBus()
816
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
817
avahi.DBUS_PATH_SERVER),
818
avahi.DBUS_INTERFACE_SERVER)
672
server = dbus.Interface(
673
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
674
avahi.DBUS_INTERFACE_SERVER )
819
675
# End of Avahi example code
820
676
677
debug = options.debug
678
679
if debug:
680
console = logging.StreamHandler()
681
# console.setLevel(logging.DEBUG)
682
console.setFormatter(logging.Formatter\
683
('%(levelname)s: %(message)s'))
684
logger.addHandler(console)
685
del console
686
687
clients = Set()
821
688
def remove_from_clients(client):
822
689
clients.remove(client)
823
690
if not clients:
824
logger.critical(u"No clients left, exiting")
825
sys.exit()
691
logger.debug(u"No clients left, exiting")
692
killme()
826
693
827
clients.update(Set(Client(name = section,
694
clients.update(Set(Client(name=section,
828
695
stop_hook = remove_from_clients,
829
config
830
= dict(client_config.items(section)))
696
**(dict(client_config\
697
.items(section))))
831
698
for section in client_config.sections()))
832
if not clients:
833
logger.critical(u"No clients defined")
834
sys.exit(1)
835
836
if debug:
837
# Redirect stdin so all checkers get /dev/null
838
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
839
os.dup2(null, sys.stdin.fileno())
840
if null > 2:
841
os.close(null)
842
else:
843
# No console logging
844
logger.removeHandler(console)
845
# Close all input and output, do double fork, etc.
846
daemon()
847
848
try:
849
pid = os.getpid()
850
pidfile.write(str(pid) + "\n")
851
pidfile.close()
852
del pidfile
853
except IOError:
854
logger.error(u"Could not write to file %r with PID %d",
855
pidfilename, pid)
856
except NameError:
857
# "pidfile" was never created
858
pass
859
del pidfilename
699
700
if not debug:
701
daemon(False, False)
860
702
861
703
def cleanup():
862
704
"Cleanup function; run on exit"
876
718
877
719
if not debug:
878
720
signal.signal(signal.SIGINT, signal.SIG_IGN)
879
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
880
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
721
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
722
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
881
723
882
724
for client in clients:
883
725
client.start()
884
726
885
tcp_server.enable()
886
tcp_server.server_activate()
887
888
# Find out what port we got
889
service.port = tcp_server.socket.getsockname()[1]
890
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
891
u" scope_id %d" % tcp_server.socket.getsockname())
892
893
#service.interface = tcp_server.socket.getsockname()[3]
894
895
try:
896
# From the Avahi example code
897
server.connect_to_signal("StateChanged", server_state_changed)
898
try:
899
server_state_changed(server.GetState())
900
except dbus.exceptions.DBusException, error:
901
logger.critical(u"DBusException: %s", error)
902
sys.exit(1)
903
# End of Avahi example code
904
905
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
906
lambda *args, **kwargs:
907
tcp_server.handle_request\
908
(*args[2:], **kwargs) or True)
909
910
logger.debug(u"Starting main loop")
727
tcp_server = IPv6_TCPServer((options.address, options.port),
728
tcp_handler,
729
options=options,
730
clients=clients)
731
# Find out what random port we got
732
global servicePort
733
servicePort = tcp_server.socket.getsockname()[1]
734
logger.debug(u"Now listening on port %d", servicePort)
735
736
if options.interface is not None:
737
global serviceInterface
738
serviceInterface = if_nametoindex(options.interface)
739
740
# From the Avahi example code
741
server.connect_to_signal("StateChanged", server_state_changed)
742
try:
743
server_state_changed(server.GetState())
744
except dbus.exceptions.DBusException, error:
745
logger.critical(u"DBusException: %s", error)
746
killme(1)
747
# End of Avahi example code
748
749
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
750
lambda *args, **kwargs:
751
tcp_server.handle_request(*args[2:],
752
**kwargs) or True)
753
try:
754
logger.debug("Starting main loop")
755
main_loop_started = True
911
756
main_loop.run()
912
except AvahiError, error:
913
logger.critical(u"AvahiError: %s" + unicode(error))
914
sys.exit(1)
915
757
except KeyboardInterrupt:
916
758
if debug:
917
759
print
760
761
sys.exit(exitstatus)
918
762
919
763
if __name__ == '__main__':
920
764
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0