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- Committer: Teddy Hogeborn
- Date: 2008-01-30 17:28:18 UTC
- Revision ID: teddy@fukt.bsnet.se-20080130172818-fnrq2xmtg1wa8wo2
* client.cpp (main): Get t_old early since it is used on error exits.
* server.py (Client.checker): New attribute.
(Client.check_action, Client.start_checker, Client.stop_checker,
Client.fileno, Client.next_stop, Client.still_valid,
Client.it_is_time_to_check): New methods.
(Client.handle_request): Alias to "check_action".
(main): Stop all started checkers on exit. Exit cleanly on keyboard
interrupt.
* server.py (Client.checker): New attribute.
(Client.check_action, Client.start_checker, Client.stop_checker,
Client.fileno, Client.next_stop, Client.still_valid,
Client.it_is_time_to_check): New methods.
(Client.handle_request): Alias to "check_action".
(main): Stop all started checkers on exit. Exit cleanly on keyboard
interrupt.
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- plugins.d
- files renamed:
- clients.conf => mandos-clients.conf
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
1
1
#!/usr/bin/python
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 Teddy Hogeborn & Björn Påhlsson
15
#
16
# This program is free software: you can redistribute it and/or modify
17
# it under the terms of the GNU General Public License as published by
18
# the Free Software Foundation, either version 3 of the License, or
19
# (at your option) any later version.
20
#
21
# This program is distributed in the hope that it will be useful,
22
# but WITHOUT ANY WARRANTY; without even the implied warranty of
23
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
24
# GNU General Public License for more details.
25
#
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/>.
29
#
30
# Contact the authors at <mandos@fukt.bsnet.se>.
31
#
32
33
from __future__ import division, with_statement, absolute_import
34
2
35
3
import SocketServer
36
4
import socket
5
import select
37
6
from optparse import OptionParser
38
7
import datetime
39
8
import errno
40
9
import gnutls.crypto
41
10
import gnutls.connection
42
11
import gnutls.errors
43
import gnutls.library.functions
44
import gnutls.library.constants
45
import gnutls.library.types
46
12
import ConfigParser
47
13
import sys
48
14
import re
49
15
import os
50
16
import signal
51
from sets import Set
52
import subprocess
53
import atexit
54
import stat
55
import logging
56
import logging.handlers
57
import pwd
58
from contextlib import closing
59
60
import dbus
61
import gobject
62
import avahi
63
from dbus.mainloop.glib import DBusGMainLoop
64
import ctypes
65
import ctypes.util
66
67
version = "1.0.2"
68
69
logger = logging.Logger('mandos')
70
syslogger = logging.handlers.SysLogHandler\
71
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
72
address = "/dev/log")
73
syslogger.setFormatter(logging.Formatter\
74
('Mandos: %(levelname)s: %(message)s'))
75
logger.addHandler(syslogger)
76
77
console = logging.StreamHandler()
78
console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
79
' %(message)s'))
80
logger.addHandler(console)
81
82
class AvahiError(Exception):
83
def __init__(self, value):
84
self.value = value
85
super(AvahiError, self).__init__()
86
def __str__(self):
87
return repr(self.value)
88
89
class AvahiServiceError(AvahiError):
90
pass
91
92
class AvahiGroupError(AvahiError):
93
pass
94
95
96
class AvahiService(object):
97
"""An Avahi (Zeroconf) service.
98
Attributes:
99
interface: integer; avahi.IF_UNSPEC or an interface index.
100
Used to optionally bind to the specified interface.
101
name: string; Example: 'Mandos'
102
type: string; Example: '_mandos._tcp'.
103
See <http://www.dns-sd.org/ServiceTypes.html>
104
port: integer; what port to announce
105
TXT: list of strings; TXT record for the service
106
domain: string; Domain to publish on, default to .local if empty.
107
host: string; Host to publish records for, default is localhost
108
max_renames: integer; maximum number of renames
109
rename_count: integer; counter so we only rename after collisions
110
a sensible number of times
111
"""
112
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
113
servicetype = None, port = None, TXT = None, domain = "",
114
host = "", max_renames = 32768):
115
self.interface = interface
116
self.name = name
117
self.type = servicetype
118
self.port = port
119
if TXT is None:
120
self.TXT = []
121
else:
122
self.TXT = TXT
123
self.domain = domain
124
self.host = host
125
self.rename_count = 0
126
self.max_renames = max_renames
127
def rename(self):
128
"""Derived from the Avahi example code"""
129
if self.rename_count >= self.max_renames:
130
logger.critical(u"No suitable Zeroconf service name found"
131
u" after %i retries, exiting.",
132
self.rename_count)
133
raise AvahiServiceError("Too many renames")
134
self.name = server.GetAlternativeServiceName(self.name)
135
logger.info(u"Changing Zeroconf service name to %r ...",
136
str(self.name))
137
syslogger.setFormatter(logging.Formatter\
138
('Mandos (%s): %%(levelname)s:'
139
' %%(message)s' % self.name))
140
self.remove()
141
self.add()
142
self.rename_count += 1
143
def remove(self):
144
"""Derived from the Avahi example code"""
145
if group is not None:
146
group.Reset()
147
def add(self):
148
"""Derived from the Avahi example code"""
149
global group
150
if group is None:
151
group = dbus.Interface\
152
(bus.get_object(avahi.DBUS_NAME,
153
server.EntryGroupNew()),
154
avahi.DBUS_INTERFACE_ENTRY_GROUP)
155
group.connect_to_signal('StateChanged',
156
entry_group_state_changed)
157
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
158
service.name, service.type)
159
group.AddService(
160
self.interface, # interface
161
avahi.PROTO_INET6, # protocol
162
dbus.UInt32(0), # flags
163
self.name, self.type,
164
self.domain, self.host,
165
dbus.UInt16(self.port),
166
avahi.string_array_to_txt_array(self.TXT))
167
group.Commit()
168
169
# From the Avahi example code:
170
group = None # our entry group
171
# End of Avahi example code
172
173
17
174
18
class Client(object):
175
"""A representation of a client host served by this server.
176
Attributes:
177
name: string; from the config file, used in log messages
178
fingerprint: string (40 or 32 hexadecimal digits); used to
179
uniquely identify the client
180
secret: bytestring; sent verbatim (over TLS) to client
181
host: string; available for use by the checker command
182
created: datetime.datetime(); object creation, not client host
183
last_checked_ok: datetime.datetime() or None if not yet checked OK
184
timeout: datetime.timedelta(); How long from last_checked_ok
185
until this client is invalid
186
interval: datetime.timedelta(); How often to start a new checker
187
stop_hook: If set, called by stop() as stop_hook(self)
188
checker: subprocess.Popen(); a running checker process used
189
to see if the client lives.
190
'None' if no process is running.
191
checker_initiator_tag: a gobject event source tag, or None
192
stop_initiator_tag: - '' -
193
checker_callback_tag: - '' -
194
checker_command: string; External command which is run to check if
195
client lives. %() expansions are done at
196
runtime with vars(self) as dict, so that for
197
instance %(name)s can be used in the command.
198
Private attibutes:
199
_timeout: Real variable for 'timeout'
200
_interval: Real variable for 'interval'
201
_timeout_milliseconds: Used when calling gobject.timeout_add()
202
_interval_milliseconds: - '' -
203
"""
204
def _set_timeout(self, timeout):
205
"Setter function for 'timeout' attribute"
206
self._timeout = timeout
207
self._timeout_milliseconds = ((self.timeout.days
208
* 24 * 60 * 60 * 1000)
209
+ (self.timeout.seconds * 1000)
210
+ (self.timeout.microseconds
211
// 1000))
212
timeout = property(lambda self: self._timeout,
213
_set_timeout)
214
del _set_timeout
215
def _set_interval(self, interval):
216
"Setter function for 'interval' attribute"
217
self._interval = interval
218
self._interval_milliseconds = ((self.interval.days
219
* 24 * 60 * 60 * 1000)
220
+ (self.interval.seconds
221
* 1000)
222
+ (self.interval.microseconds
223
// 1000))
224
interval = property(lambda self: self._interval,
225
_set_interval)
226
del _set_interval
227
def __init__(self, name = None, stop_hook=None, config=None):
228
"""Note: the 'checker' key in 'config' sets the
229
'checker_command' attribute and *not* the 'checker'
230
attribute."""
231
if config is None:
232
config = {}
19
def __init__(self, name=None, options=None, dn=None,
20
password=None, passfile=None, fqdn=None,
21
timeout=None, interval=-1):
233
22
self.name = name
234
logger.debug(u"Creating client %r", self.name)
235
# Uppercase and remove spaces from fingerprint for later
236
# comparison purposes with return value from the fingerprint()
237
# function
238
self.fingerprint = config["fingerprint"].upper()\
239
.replace(u" ", u"")
240
logger.debug(u" Fingerprint: %s", self.fingerprint)
241
if "secret" in config:
242
self.secret = config["secret"].decode(u"base64")
243
elif "secfile" in config:
244
with closing(open(os.path.expanduser
245
(os.path.expandvars
246
(config["secfile"])))) \
247
as secfile:
248
self.secret = secfile.read()
23
self.dn = dn
24
if password:
25
self.password = password
26
elif passfile:
27
self.password = open(passfile).readall()
249
28
else:
250
raise TypeError(u"No secret or secfile for client %s"
251
% self.name)
252
self.host = config.get("host", "")
29
print "No Password or Passfile in client config file"
30
# raise RuntimeError XXX
31
self.password = "gazonk"
32
self.fqdn = fqdn # string
253
33
self.created = datetime.datetime.now()
254
self.last_checked_ok = None
255
self.timeout = string_to_delta(config["timeout"])
256
self.interval = string_to_delta(config["interval"])
257
self.stop_hook = stop_hook
258
self.checker = None
259
self.checker_initiator_tag = None
260
self.stop_initiator_tag = None
261
self.checker_callback_tag = None
262
self.check_command = config["checker"]
263
def start(self):
264
"""Start this client's checker and timeout hooks"""
265
# Schedule a new checker to be started an 'interval' from now,
266
# and every interval from then on.
267
self.checker_initiator_tag = gobject.timeout_add\
268
(self._interval_milliseconds,
269
self.start_checker)
270
# Also start a new checker *right now*.
271
self.start_checker()
272
# Schedule a stop() when 'timeout' has passed
273
self.stop_initiator_tag = gobject.timeout_add\
274
(self._timeout_milliseconds,
275
self.stop)
276
def stop(self):
277
"""Stop this client.
278
The possibility that a client might be restarted is left open,
279
but not currently used."""
280
# If this client doesn't have a secret, it is already stopped.
281
if hasattr(self, "secret") and self.secret:
282
logger.info(u"Stopping client %s", self.name)
283
self.secret = None
284
else:
285
return False
286
if getattr(self, "stop_initiator_tag", False):
287
gobject.source_remove(self.stop_initiator_tag)
288
self.stop_initiator_tag = None
289
if getattr(self, "checker_initiator_tag", False):
290
gobject.source_remove(self.checker_initiator_tag)
291
self.checker_initiator_tag = None
34
self.last_seen = None # datetime.datetime()
35
if timeout is None:
36
timeout = options.timeout
37
self.timeout = timeout # datetime.timedelta()
38
if interval == -1:
39
interval = options.interval
40
self.interval = interval # datetime.timedelta()
41
self.next_check = datetime.datetime.now() # datetime.datetime()
42
self.checker = None # or a subprocess.Popen()
43
def check_action(self, now=None):
44
"""The checker said something and might have completed.
45
Check if is has, and take appropriate actions."""
46
if self.checker.poll() is None:
47
# False alarm, no result yet
48
#self.checker.read()
49
return
50
if now is None:
51
now = datetime.datetime.now()
52
if self.checker.returncode == 0:
53
self.last_seen = now
54
while self.next_check <= now:
55
self.next_check += self.interval
56
handle_request = check_action
57
def start_checker(self):
292
58
self.stop_checker()
293
if self.stop_hook:
294
self.stop_hook(self)
295
# Do not run this again if called by a gobject.timeout_add
296
return False
297
def __del__(self):
298
self.stop_hook = None
299
self.stop()
300
def checker_callback(self, pid, condition):
301
"""The checker has completed, so take appropriate actions."""
302
self.checker_callback_tag = None
59
try:
60
self.checker = subprocess.Popen("sleep 1; fping -q -- %s"
61
% re.escape(self.fqdn),
62
stdout=subprocess.PIPE,
63
close_fds=True,
64
shell=True, cwd="/")
65
except subprocess.OSError, e:
66
print "Failed to start subprocess:", e
67
def stop_checker(self):
68
if self.checker is None:
69
return
70
os.kill(self.checker.pid, signal.SIGTERM)
71
if self.checker.poll() is None:
72
os.kill(self.checker.pid, signal.SIGKILL)
303
73
self.checker = None
304
if os.WIFEXITED(condition) \
305
and (os.WEXITSTATUS(condition) == 0):
306
logger.info(u"Checker for %(name)s succeeded",
307
vars(self))
308
self.bump_timeout()
309
elif not os.WIFEXITED(condition):
310
logger.warning(u"Checker for %(name)s crashed?",
311
vars(self))
312
else:
313
logger.info(u"Checker for %(name)s failed",
314
vars(self))
315
def bump_timeout(self):
316
"""Bump up the timeout for this client.
317
This should only be called when the client has been seen,
318
alive and well.
319
"""
320
self.last_checked_ok = datetime.datetime.now()
321
gobject.source_remove(self.stop_initiator_tag)
322
self.stop_initiator_tag = gobject.timeout_add\
323
(self._timeout_milliseconds, self.stop)
324
def start_checker(self):
325
"""Start a new checker subprocess if one is not running.
326
If a checker already exists, leave it running and do
327
nothing."""
328
# The reason for not killing a running checker is that if we
329
# did that, then if a checker (for some reason) started
330
# running slowly and taking more than 'interval' time, the
331
# client would inevitably timeout, since no checker would get
332
# a chance to run to completion. If we instead leave running
333
# checkers alone, the checker would have to take more time
334
# than 'timeout' for the client to be declared invalid, which
335
# is as it should be.
74
__del__ = stop_checker
75
def fileno(self):
336
76
if self.checker is None:
337
try:
338
# In case check_command has exactly one % operator
339
command = self.check_command % self.host
340
except TypeError:
341
# Escape attributes for the shell
342
escaped_attrs = dict((key, re.escape(str(val)))
343
for key, val in
344
vars(self).iteritems())
77
return None
78
return self.checker.stdout.fileno()
79
def next_stop(self):
80
"""The time when something must be done about this client"""
81
return min(self.last_seen + self.timeout, self.next_check)
82
def still_valid(self, now=None):
83
"""Has this client's timeout not passed?"""
84
if now is None:
85
now = datetime.datetime.now()
86
return now < (self.last_seen + timeout)
87
def it_is_time_to_check(self, now=None):
88
if now is None:
89
now = datetime.datetime.now()
90
return self.next_check <= now
91
92
93
class server_metaclass(type):
94
"Common behavior for the UDP and TCP server classes"
95
def __new__(cls, name, bases, attrs):
96
attrs["address_family"] = socket.AF_INET6
97
attrs["allow_reuse_address"] = True
98
def server_bind(self):
99
if self.options.interface:
100
if not hasattr(socket, "SO_BINDTODEVICE"):
101
# From /usr/include/asm-i486/socket.h
102
socket.SO_BINDTODEVICE = 25
345
103
try:
346
command = self.check_command % escaped_attrs
347
except TypeError, error:
348
logger.error(u'Could not format string "%s":'
349
u' %s', self.check_command, error)
350
return True # Try again later
351
try:
352
logger.info(u"Starting checker %r for %s",
353
command, self.name)
354
# We don't need to redirect stdout and stderr, since
355
# in normal mode, that is already done by daemon(),
356
# and in debug mode we don't want to. (Stdin is
357
# always replaced by /dev/null.)
358
self.checker = subprocess.Popen(command,
359
close_fds=True,
360
shell=True, cwd="/")
361
self.checker_callback_tag = gobject.child_watch_add\
362
(self.checker.pid,
363
self.checker_callback)
364
except OSError, error:
365
logger.error(u"Failed to start subprocess: %s",
366
error)
367
# Re-run this periodically if run by gobject.timeout_add
368
return True
369
def stop_checker(self):
370
"""Force the checker process, if any, to stop."""
371
if self.checker_callback_tag:
372
gobject.source_remove(self.checker_callback_tag)
373
self.checker_callback_tag = None
374
if getattr(self, "checker", None) is None:
375
return
376
logger.debug(u"Stopping checker for %(name)s", vars(self))
377
try:
378
os.kill(self.checker.pid, signal.SIGTERM)
379
#os.sleep(0.5)
380
#if self.checker.poll() is None:
381
# os.kill(self.checker.pid, signal.SIGKILL)
382
except OSError, error:
383
if error.errno != errno.ESRCH: # No such process
384
raise
385
self.checker = None
386
def still_valid(self):
387
"""Has the timeout not yet passed for this client?"""
388
now = datetime.datetime.now()
389
if self.last_checked_ok is None:
390
return now < (self.created + self.timeout)
391
else:
392
return now < (self.last_checked_ok + self.timeout)
393
394
395
def peer_certificate(session):
396
"Return the peer's OpenPGP certificate as a bytestring"
397
# If not an OpenPGP certificate...
398
if gnutls.library.functions.gnutls_certificate_type_get\
399
(session._c_object) \
400
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
401
# ...do the normal thing
402
return session.peer_certificate
403
list_size = ctypes.c_uint()
404
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
405
(session._c_object, ctypes.byref(list_size))
406
if list_size.value == 0:
407
return None
408
cert = cert_list[0]
409
return ctypes.string_at(cert.data, cert.size)
410
411
412
def fingerprint(openpgp):
413
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
414
# New GnuTLS "datum" with the OpenPGP public key
415
datum = gnutls.library.types.gnutls_datum_t\
416
(ctypes.cast(ctypes.c_char_p(openpgp),
417
ctypes.POINTER(ctypes.c_ubyte)),
418
ctypes.c_uint(len(openpgp)))
419
# New empty GnuTLS certificate
420
crt = gnutls.library.types.gnutls_openpgp_crt_t()
421
gnutls.library.functions.gnutls_openpgp_crt_init\
422
(ctypes.byref(crt))
423
# Import the OpenPGP public key into the certificate
424
gnutls.library.functions.gnutls_openpgp_crt_import\
425
(crt, ctypes.byref(datum),
426
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
427
# Verify the self signature in the key
428
crtverify = ctypes.c_uint()
429
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
430
(crt, 0, ctypes.byref(crtverify))
431
if crtverify.value != 0:
432
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
433
raise gnutls.errors.CertificateSecurityError("Verify failed")
434
# New buffer for the fingerprint
435
buf = ctypes.create_string_buffer(20)
436
buf_len = ctypes.c_size_t()
437
# Get the fingerprint from the certificate into the buffer
438
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
439
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
440
# Deinit the certificate
441
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
442
# Convert the buffer to a Python bytestring
443
fpr = ctypes.string_at(buf, buf_len.value)
444
# Convert the bytestring to hexadecimal notation
445
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
446
return hex_fpr
447
448
449
class TCP_handler(SocketServer.BaseRequestHandler, object):
450
"""A TCP request handler class.
451
Instantiated by IPv6_TCPServer for each request to handle it.
452
Note: This will run in its own forked process."""
453
454
def handle(self):
455
logger.info(u"TCP connection from: %s",
456
unicode(self.client_address))
457
session = gnutls.connection.ClientSession\
458
(self.request, gnutls.connection.X509Credentials())
459
460
line = self.request.makefile().readline()
461
logger.debug(u"Protocol version: %r", line)
462
try:
463
if int(line.strip().split()[0]) > 1:
464
raise RuntimeError
465
except (ValueError, IndexError, RuntimeError), error:
466
logger.error(u"Unknown protocol version: %s", error)
467
return
468
469
# Note: gnutls.connection.X509Credentials is really a generic
470
# GnuTLS certificate credentials object so long as no X.509
471
# keys are added to it. Therefore, we can use it here despite
472
# using OpenPGP certificates.
473
474
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
475
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
476
# "+DHE-DSS"))
477
# Use a fallback default, since this MUST be set.
478
priority = self.server.settings.get("priority", "NORMAL")
479
gnutls.library.functions.gnutls_priority_set_direct\
480
(session._c_object, priority, None)
481
482
try:
483
session.handshake()
484
except gnutls.errors.GNUTLSError, error:
485
logger.warning(u"Handshake failed: %s", error)
486
# Do not run session.bye() here: the session is not
487
# established. Just abandon the request.
488
return
489
try:
490
fpr = fingerprint(peer_certificate(session))
491
except (TypeError, gnutls.errors.GNUTLSError), error:
492
logger.warning(u"Bad certificate: %s", error)
493
session.bye()
494
return
495
logger.debug(u"Fingerprint: %s", fpr)
496
client = None
497
for c in self.server.clients:
498
if c.fingerprint == fpr:
499
client = c
500
break
501
if not client:
502
logger.warning(u"Client not found for fingerprint: %s",
503
fpr)
504
session.bye()
505
return
506
# Have to check if client.still_valid(), since it is possible
507
# that the client timed out while establishing the GnuTLS
508
# session.
509
if not client.still_valid():
510
logger.warning(u"Client %(name)s is invalid",
511
vars(client))
512
session.bye()
513
return
514
## This won't work here, since we're in a fork.
515
# client.bump_timeout()
516
sent_size = 0
517
while sent_size < len(client.secret):
518
sent = session.send(client.secret[sent_size:])
519
logger.debug(u"Sent: %d, remaining: %d",
520
sent, len(client.secret)
521
- (sent_size + sent))
522
sent_size += sent
104
self.socket.setsockopt(socket.SOL_SOCKET,
105
socket.SO_BINDTODEVICE,
106
self.options.interface)
107
except socket.error, error:
108
if error[0] == errno.EPERM:
109
print "Warning: No permission to bind to interface", \
110
self.options.interface
111
else:
112
raise error
113
return super(type(self), self).server_bind()
114
attrs["server_bind"] = server_bind
115
def init(self, *args, **kwargs):
116
if "options" in kwargs:
117
self.options = kwargs["options"]
118
del kwargs["options"]
119
if "clients" in kwargs:
120
self.clients = kwargs["clients"]
121
del kwargs["clients"]
122
if "credentials" in kwargs:
123
self.credentials = kwargs["credentials"]
124
del kwargs["credentials"]
125
return super(type(self), self).__init__(*args, **kwargs)
126
attrs["__init__"] = init
127
return type.__new__(cls, name, bases, attrs)
128
129
130
class udp_handler(SocketServer.DatagramRequestHandler, object):
131
def handle(self):
132
self.wfile.write("Polo")
133
print "UDP request answered"
134
135
136
class IPv6_UDPServer(SocketServer.UDPServer, object):
137
__metaclass__ = server_metaclass
138
def verify_request(self, request, client_address):
139
print "UDP request came"
140
return request[0] == "Marco"
141
142
143
class tcp_handler(SocketServer.BaseRequestHandler, object):
144
def handle(self):
145
print "TCP request came"
146
print "Request:", self.request
147
print "Client Address:", self.client_address
148
print "Server:", self.server
149
session = gnutls.connection.ServerSession(self.request,
150
self.server.credentials)
151
session.handshake()
152
if session.peer_certificate:
153
print "DN:", session.peer_certificate.subject
154
try:
155
session.verify_peer()
156
except gnutls.errors.CertificateError, error:
157
print "Verify failed", error
158
session.bye()
159
return
160
try:
161
session.send(dict((client.dn, client.password)
162
for client in self.server.clients)
163
[session.peer_certificate.subject])
164
except KeyError:
165
session.send("gazonk")
166
# Log maybe? XXX
523
167
session.bye()
524
168
525
169
526
class IPv6_TCPServer(SocketServer.ForkingMixIn,
527
SocketServer.TCPServer, object):
528
"""IPv6 TCP server. Accepts 'None' as address and/or port.
529
Attributes:
530
settings: Server settings
531
clients: Set() of Client objects
532
enabled: Boolean; whether this server is activated yet
533
"""
534
address_family = socket.AF_INET6
535
def __init__(self, *args, **kwargs):
536
if "settings" in kwargs:
537
self.settings = kwargs["settings"]
538
del kwargs["settings"]
539
if "clients" in kwargs:
540
self.clients = kwargs["clients"]
541
del kwargs["clients"]
542
self.enabled = False
543
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
544
def server_bind(self):
545
"""This overrides the normal server_bind() function
546
to bind to an interface if one was specified, and also NOT to
547
bind to an address or port if they were not specified."""
548
if self.settings["interface"]:
549
# 25 is from /usr/include/asm-i486/socket.h
550
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
551
try:
552
self.socket.setsockopt(socket.SOL_SOCKET,
553
SO_BINDTODEVICE,
554
self.settings["interface"])
555
except socket.error, error:
556
if error[0] == errno.EPERM:
557
logger.error(u"No permission to"
558
u" bind to interface %s",
559
self.settings["interface"])
560
else:
561
raise error
562
# Only bind(2) the socket if we really need to.
563
if self.server_address[0] or self.server_address[1]:
564
if not self.server_address[0]:
565
in6addr_any = "::"
566
self.server_address = (in6addr_any,
567
self.server_address[1])
568
elif not self.server_address[1]:
569
self.server_address = (self.server_address[0],
570
0)
571
# if self.settings["interface"]:
572
# self.server_address = (self.server_address[0],
573
# 0, # port
574
# 0, # flowinfo
575
# if_nametoindex
576
# (self.settings
577
# ["interface"]))
578
return super(IPv6_TCPServer, self).server_bind()
579
def server_activate(self):
580
if self.enabled:
581
return super(IPv6_TCPServer, self).server_activate()
582
def enable(self):
583
self.enabled = True
584
170
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
171
__metaclass__ = server_metaclass
172
request_queue_size = 1024
173
174
175
in6addr_any = "::"
585
176
586
177
def string_to_delta(interval):
587
178
"""Parse a string and return a datetime.timedelta
596
187
datetime.timedelta(1)
597
188
>>> string_to_delta(u'1w')
598
189
datetime.timedelta(7)
599
>>> string_to_delta('5m 30s')
600
datetime.timedelta(0, 330)
601
190
"""
602
timevalue = datetime.timedelta(0)
603
for s in interval.split():
604
try:
605
suffix = unicode(s[-1])
606
value = int(s[:-1])
607
if suffix == u"d":
608
delta = datetime.timedelta(value)
609
elif suffix == u"s":
610
delta = datetime.timedelta(0, value)
611
elif suffix == u"m":
612
delta = datetime.timedelta(0, 0, 0, 0, value)
613
elif suffix == u"h":
614
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
615
elif suffix == u"w":
616
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
617
else:
618
raise ValueError
619
except (ValueError, IndexError):
191
try:
192
suffix=unicode(interval[-1])
193
value=int(interval[:-1])
194
if suffix == u"d":
195
delta = datetime.timedelta(value)
196
elif suffix == u"s":
197
delta = datetime.timedelta(0, value)
198
elif suffix == u"m":
199
delta = datetime.timedelta(0, 0, 0, 0, value)
200
elif suffix == u"h":
201
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
202
elif suffix == u"w":
203
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
204
else:
620
205
raise ValueError
621
timevalue += delta
622
return timevalue
623
624
625
def server_state_changed(state):
626
"""Derived from the Avahi example code"""
627
if state == avahi.SERVER_COLLISION:
628
logger.error(u"Zeroconf server name collision")
629
service.remove()
630
elif state == avahi.SERVER_RUNNING:
631
service.add()
632
633
634
def entry_group_state_changed(state, error):
635
"""Derived from the Avahi example code"""
636
logger.debug(u"Avahi state change: %i", state)
637
638
if state == avahi.ENTRY_GROUP_ESTABLISHED:
639
logger.debug(u"Zeroconf service established.")
640
elif state == avahi.ENTRY_GROUP_COLLISION:
641
logger.warning(u"Zeroconf service name collision.")
642
service.rename()
643
elif state == avahi.ENTRY_GROUP_FAILURE:
644
logger.critical(u"Avahi: Error in group state changed %s",
645
unicode(error))
646
raise AvahiGroupError("State changed: %s", str(error))
647
648
def if_nametoindex(interface):
649
"""Call the C function if_nametoindex(), or equivalent"""
650
global if_nametoindex
651
try:
652
if_nametoindex = ctypes.cdll.LoadLibrary\
653
(ctypes.util.find_library("c")).if_nametoindex
654
except (OSError, AttributeError):
655
if "struct" not in sys.modules:
656
import struct
657
if "fcntl" not in sys.modules:
658
import fcntl
659
def if_nametoindex(interface):
660
"Get an interface index the hard way, i.e. using fcntl()"
661
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
662
with closing(socket.socket()) as s:
663
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
664
struct.pack("16s16x", interface))
665
interface_index = struct.unpack("I", ifreq[16:20])[0]
666
return interface_index
667
return if_nametoindex(interface)
668
669
670
def daemon(nochdir = False, noclose = False):
671
"""See daemon(3). Standard BSD Unix function.
672
This should really exist as os.daemon, but it doesn't (yet)."""
673
if os.fork():
674
sys.exit()
675
os.setsid()
676
if not nochdir:
677
os.chdir("/")
678
if os.fork():
679
sys.exit()
680
if not noclose:
681
# Close all standard open file descriptors
682
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
683
if not stat.S_ISCHR(os.fstat(null).st_mode):
684
raise OSError(errno.ENODEV,
685
"/dev/null not a character device")
686
os.dup2(null, sys.stdin.fileno())
687
os.dup2(null, sys.stdout.fileno())
688
os.dup2(null, sys.stderr.fileno())
689
if null > 2:
690
os.close(null)
206
except (ValueError, IndexError):
207
raise ValueError
208
return delta
691
209
692
210
693
211
def main():
694
parser = OptionParser(version = "%%prog %s" % version)
212
parser = OptionParser()
695
213
parser.add_option("-i", "--interface", type="string",
696
metavar="IF", help="Bind to interface IF")
697
parser.add_option("-a", "--address", type="string",
698
help="Address to listen for requests on")
699
parser.add_option("-p", "--port", type="int",
214
default="eth0", metavar="IF",
215
help="Interface to bind to")
216
parser.add_option("--cert", type="string", default="cert.pem",
217
metavar="FILE",
218
help="Public key certificate to use")
219
parser.add_option("--key", type="string", default="key.pem",
220
metavar="FILE",
221
help="Private key to use")
222
parser.add_option("--ca", type="string", default="ca.pem",
223
metavar="FILE",
224
help="Certificate Authority certificate to use")
225
parser.add_option("--crl", type="string", default="crl.pem",
226
metavar="FILE",
227
help="Certificate Revokation List to use")
228
parser.add_option("-p", "--port", type="int", default=49001,
700
229
help="Port number to receive requests on")
230
parser.add_option("--dh", type="int", metavar="BITS",
231
help="DH group to use")
232
parser.add_option("-t", "--timeout", type="string", # Parsed later
233
default="15m",
234
help="Amount of downtime allowed for clients")
235
parser.add_option("--interval", type="string", # Parsed later
236
default="5m",
237
help="How often to check that a client is up")
701
238
parser.add_option("--check", action="store_true", default=False,
702
239
help="Run self-test")
703
parser.add_option("--debug", action="store_true",
704
help="Debug mode; run in foreground and log to"
705
" terminal")
706
parser.add_option("--priority", type="string", help="GnuTLS"
707
" priority string (see GnuTLS documentation)")
708
parser.add_option("--servicename", type="string", metavar="NAME",
709
help="Zeroconf service name")
710
parser.add_option("--configdir", type="string",
711
default="/etc/mandos", metavar="DIR",
712
help="Directory to search for configuration"
713
" files")
714
options = parser.parse_args()[0]
715
240
(options, args) = parser.parse_args()
241
716
242
if options.check:
717
243
import doctest
718
244
doctest.testmod()
719
245
sys.exit()
720
246
721
# Default values for config file for server-global settings
722
server_defaults = { "interface": "",
723
"address": "",
724
"port": "",
725
"debug": "False",
726
"priority":
727
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
728
"servicename": "Mandos",
729
}
730
731
# Parse config file for server-global settings
732
server_config = ConfigParser.SafeConfigParser(server_defaults)
733
del server_defaults
734
server_config.read(os.path.join(options.configdir, "mandos.conf"))
735
# Convert the SafeConfigParser object to a dict
736
server_settings = server_config.defaults()
737
# Use getboolean on the boolean config option
738
server_settings["debug"] = server_config.getboolean\
739
("DEFAULT", "debug")
740
del server_config
741
742
# Override the settings from the config file with command line
743
# options, if set.
744
for option in ("interface", "address", "port", "debug",
745
"priority", "servicename", "configdir"):
746
value = getattr(options, option)
747
if value is not None:
748
server_settings[option] = value
749
del options
750
# Now we have our good server settings in "server_settings"
751
752
debug = server_settings["debug"]
753
754
if not debug:
755
syslogger.setLevel(logging.WARNING)
756
console.setLevel(logging.WARNING)
757
758
if server_settings["servicename"] != "Mandos":
759
syslogger.setFormatter(logging.Formatter\
760
('Mandos (%s): %%(levelname)s:'
761
' %%(message)s'
762
% server_settings["servicename"]))
763
764
# Parse config file with clients
765
client_defaults = { "timeout": "1h",
766
"interval": "5m",
767
"checker": "fping -q -- %(host)s",
768
"host": "",
769
}
770
client_config = ConfigParser.SafeConfigParser(client_defaults)
771
client_config.read(os.path.join(server_settings["configdir"],
772
"clients.conf"))
773
774
clients = Set()
775
tcp_server = IPv6_TCPServer((server_settings["address"],
776
server_settings["port"]),
777
TCP_handler,
778
settings=server_settings,
779
clients=clients)
780
pidfilename = "/var/run/mandos.pid"
781
try:
782
pidfile = open(pidfilename, "w")
783
except IOError, error:
784
logger.error("Could not open file %r", pidfilename)
785
786
uid = 65534
787
gid = 65534
788
try:
789
uid = pwd.getpwnam("mandos").pw_uid
790
except KeyError:
791
try:
792
uid = pwd.getpwnam("nobody").pw_uid
793
except KeyError:
794
pass
795
try:
796
gid = pwd.getpwnam("mandos").pw_gid
797
except KeyError:
798
try:
799
gid = pwd.getpwnam("nogroup").pw_gid
800
except KeyError:
801
pass
802
try:
803
os.setuid(uid)
804
os.setgid(gid)
805
except OSError, error:
806
if error[0] != errno.EPERM:
807
raise error
808
809
global service
810
service = AvahiService(name = server_settings["servicename"],
811
servicetype = "_mandos._tcp", )
812
if server_settings["interface"]:
813
service.interface = if_nametoindex\
814
(server_settings["interface"])
815
816
global main_loop
817
global bus
818
global server
819
# From the Avahi example code
820
DBusGMainLoop(set_as_default=True )
821
main_loop = gobject.MainLoop()
822
bus = dbus.SystemBus()
823
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
824
avahi.DBUS_PATH_SERVER),
825
avahi.DBUS_INTERFACE_SERVER)
826
# End of Avahi example code
827
828
def remove_from_clients(client):
829
clients.remove(client)
830
if not clients:
831
logger.critical(u"No clients left, exiting")
832
sys.exit()
833
834
clients.update(Set(Client(name = section,
835
stop_hook = remove_from_clients,
836
config
837
= dict(client_config.items(section)))
838
for section in client_config.sections()))
839
if not clients:
840
logger.critical(u"No clients defined")
841
sys.exit(1)
842
843
if debug:
844
# Redirect stdin so all checkers get /dev/null
845
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
846
os.dup2(null, sys.stdin.fileno())
847
if null > 2:
848
os.close(null)
849
else:
850
# No console logging
851
logger.removeHandler(console)
852
# Close all input and output, do double fork, etc.
853
daemon()
854
855
try:
856
pid = os.getpid()
857
pidfile.write(str(pid) + "\n")
858
pidfile.close()
859
del pidfile
860
except IOError:
861
logger.error(u"Could not write to file %r with PID %d",
862
pidfilename, pid)
863
except NameError:
864
# "pidfile" was never created
865
pass
866
del pidfilename
867
868
def cleanup():
869
"Cleanup function; run on exit"
870
global group
871
# From the Avahi example code
872
if not group is None:
873
group.Free()
874
group = None
875
# End of Avahi example code
876
877
while clients:
878
client = clients.pop()
879
client.stop_hook = None
880
client.stop()
881
882
atexit.register(cleanup)
883
884
if not debug:
885
signal.signal(signal.SIGINT, signal.SIG_IGN)
886
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
887
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
888
247
# Parse the time arguments
248
try:
249
options.timeout = string_to_delta(options.timeout)
250
except ValueError:
251
parser.error("option --timeout: Unparseable time")
252
253
try:
254
options.interval = string_to_delta(options.interval)
255
except ValueError:
256
parser.error("option --interval: Unparseable time")
257
258
cert = gnutls.crypto.X509Certificate(open(options.cert).read())
259
key = gnutls.crypto.X509PrivateKey(open(options.key).read())
260
ca = gnutls.crypto.X509Certificate(open(options.ca).read())
261
crl = gnutls.crypto.X509CRL(open(options.crl).read())
262
cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
263
264
# Parse config file
265
defaults = {}
266
client_config_object = ConfigParser.SafeConfigParser(defaults)
267
client_config_object.read("mandos-clients.conf")
268
clients = [Client(name=section, options=options,
269
**(dict(client_config_object.items(section))))
270
for section in client_config_object.sections()]
271
272
udp_server = IPv6_UDPServer((in6addr_any, options.port),
273
udp_handler,
274
options=options)
275
276
tcp_server = IPv6_TCPServer((in6addr_any, options.port),
277
tcp_handler,
278
options=options,
279
clients=clients,
280
credentials=cred)
281
282
while True:
283
try:
284
input, out, err = select.select((udp_server,
285
tcp_server), (), ())
286
if not input:
287
pass
288
else:
289
for obj in input:
290
obj.handle_request()
291
except KeyboardInterrupt:
292
break
293
294
# Cleanup here
889
295
for client in clients:
890
client.start()
891
892
tcp_server.enable()
893
tcp_server.server_activate()
894
895
# Find out what port we got
896
service.port = tcp_server.socket.getsockname()[1]
897
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
898
u" scope_id %d" % tcp_server.socket.getsockname())
899
900
#service.interface = tcp_server.socket.getsockname()[3]
901
902
try:
903
# From the Avahi example code
904
server.connect_to_signal("StateChanged", server_state_changed)
905
try:
906
server_state_changed(server.GetState())
907
except dbus.exceptions.DBusException, error:
908
logger.critical(u"DBusException: %s", error)
909
sys.exit(1)
910
# End of Avahi example code
911
912
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
913
lambda *args, **kwargs:
914
tcp_server.handle_request\
915
(*args[2:], **kwargs) or True)
916
917
logger.debug(u"Starting main loop")
918
main_loop.run()
919
except AvahiError, error:
920
logger.critical(u"AvahiError: %s" + unicode(error))
921
sys.exit(1)
922
except KeyboardInterrupt:
923
if debug:
924
print
925
926
if __name__ == '__main__':
296
client.stop_checker()
297
298
299
if __name__ == "__main__":
927
300
main()
301
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0