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- Committer: Teddy Hogeborn
- Date: 2008-09-21 13:42:34 UTC
- Revision ID: teddy@fukt.bsnet.se-20080921134234-jo8p4rwtm50yb4xj
* clients.conf ([bar]/secfile): Do not imply armored format.
* debian/control: Build-Depend on pkg-config.
* debian/mandos.prerm (remove): Bug fix; check for
"/etc/init.d/mandos", not
"/etc/init.d/ssh".
* debian/control: Build-Depend on pkg-config.
* debian/mandos.prerm (remove): Bug fix; check for
"/etc/init.d/mandos", not
"/etc/init.d/ssh".
- files added:
- .bzr-builddeb
- debian
- debian/po
- plugins.d
- files removed:
- ca.pem
- files renamed:
- mandos-clients.conf => clients.conf
- server.py => mandos
- files modified:
- Makefile
added
removed
mandos
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 © 2007-2008 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
#
2
32
3
33
from __future__ import division
4
34
11
41
import gnutls.crypto
12
42
import gnutls.connection
13
43
import gnutls.errors
44
import gnutls.library.functions
45
import gnutls.library.constants
46
import gnutls.library.types
14
47
import ConfigParser
15
48
import sys
16
49
import re
18
51
import signal
19
52
from sets import Set
20
53
import subprocess
54
import atexit
55
import stat
56
import logging
57
import logging.handlers
58
import pwd
21
59
22
60
import dbus
23
61
import gobject
24
62
import avahi
25
63
from dbus.mainloop.glib import DBusGMainLoop
26
27
# This variable is used to optionally bind to a specified
28
# interface.
29
serviceInterface = avahi.IF_UNSPEC
30
# It is a global variable to fit in with the rest of the
31
# variables from the Avahi server example code:
32
serviceName = "Mandos"
33
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
34
servicePort = None # Not known at startup
35
serviceTXT = [] # TXT record for the service
36
domain = "" # Domain to publish on, default to .local
37
host = "" # Host to publish records for, default to localhost
38
group = None #our entry group
39
rename_count = 12 # Counter so we only rename after collisions a
40
# sensible number of times
64
import ctypes
65
66
version = "1.0"
67
68
logger = logging.Logger('mandos')
69
syslogger = logging.handlers.SysLogHandler\
70
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
71
address = "/dev/log")
72
syslogger.setFormatter(logging.Formatter\
73
('Mandos: %(levelname)s: %(message)s'))
74
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
def __str__(self):
85
return repr(self.value)
86
87
class AvahiServiceError(AvahiError):
88
pass
89
90
class AvahiGroupError(AvahiError):
91
pass
92
93
94
class AvahiService(object):
95
"""An Avahi (Zeroconf) service.
96
Attributes:
97
interface: integer; avahi.IF_UNSPEC or an interface index.
98
Used to optionally bind to the specified interface.
99
name: string; Example: 'Mandos'
100
type: string; Example: '_mandos._tcp'.
101
See <http://www.dns-sd.org/ServiceTypes.html>
102
port: integer; what port to announce
103
TXT: list of strings; TXT record for the service
104
domain: string; Domain to publish on, default to .local if empty.
105
host: string; Host to publish records for, default is localhost
106
max_renames: integer; maximum number of renames
107
rename_count: integer; counter so we only rename after collisions
108
a sensible number of times
109
"""
110
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
111
type = None, port = None, TXT = None, domain = "",
112
host = "", max_renames = 32768):
113
self.interface = interface
114
self.name = name
115
self.type = type
116
self.port = port
117
if TXT is None:
118
self.TXT = []
119
else:
120
self.TXT = TXT
121
self.domain = domain
122
self.host = host
123
self.rename_count = 0
124
self.max_renames = max_renames
125
def rename(self):
126
"""Derived from the Avahi example code"""
127
if self.rename_count >= self.max_renames:
128
logger.critical(u"No suitable Zeroconf service name found"
129
u" after %i retries, exiting.",
130
rename_count)
131
raise AvahiServiceError("Too many renames")
132
self.name = server.GetAlternativeServiceName(self.name)
133
logger.info(u"Changing Zeroconf service name to %r ...",
134
str(self.name))
135
syslogger.setFormatter(logging.Formatter\
136
('Mandos (%s): %%(levelname)s:'
137
' %%(message)s' % self.name))
138
self.remove()
139
self.add()
140
self.rename_count += 1
141
def remove(self):
142
"""Derived from the Avahi example code"""
143
if group is not None:
144
group.Reset()
145
def add(self):
146
"""Derived from the Avahi example code"""
147
global group
148
if group is None:
149
group = dbus.Interface\
150
(bus.get_object(avahi.DBUS_NAME,
151
server.EntryGroupNew()),
152
avahi.DBUS_INTERFACE_ENTRY_GROUP)
153
group.connect_to_signal('StateChanged',
154
entry_group_state_changed)
155
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
156
service.name, service.type)
157
group.AddService(
158
self.interface, # interface
159
avahi.PROTO_INET6, # protocol
160
dbus.UInt32(0), # flags
161
self.name, self.type,
162
self.domain, self.host,
163
dbus.UInt16(self.port),
164
avahi.string_array_to_txt_array(self.TXT))
165
group.Commit()
166
167
# From the Avahi example code:
168
group = None # our entry group
41
169
# End of Avahi example code
42
170
43
171
44
172
class Client(object):
45
173
"""A representation of a client host served by this server.
46
174
Attributes:
47
password: string
48
fqdn: string, FQDN (used by the checker)
49
created: datetime.datetime()
50
last_seen: datetime.datetime() or None if not yet seen
51
timeout: datetime.timedelta(); How long from last_seen until
52
this client is invalid
175
name: string; from the config file, used in log messages
176
fingerprint: string (40 or 32 hexadecimal digits); used to
177
uniquely identify the client
178
secret: bytestring; sent verbatim (over TLS) to client
179
host: string; available for use by the checker command
180
created: datetime.datetime(); object creation, not client host
181
last_checked_ok: datetime.datetime() or None if not yet checked OK
182
timeout: datetime.timedelta(); How long from last_checked_ok
183
until this client is invalid
53
184
interval: datetime.timedelta(); How often to start a new checker
54
timeout_milliseconds: Used by gobject.timeout_add()
55
interval_milliseconds: - '' -
56
185
stop_hook: If set, called by stop() as stop_hook(self)
57
186
checker: subprocess.Popen(); a running checker process used
58
187
to see if the client lives.
59
Is None if no process is running.
188
'None' if no process is running.
60
189
checker_initiator_tag: a gobject event source tag, or None
61
190
stop_initiator_tag: - '' -
62
191
checker_callback_tag: - '' -
192
checker_command: string; External command which is run to check if
193
client lives. %() expansions are done at
194
runtime with vars(self) as dict, so that for
195
instance %(name)s can be used in the command.
196
Private attibutes:
197
_timeout: Real variable for 'timeout'
198
_interval: Real variable for 'interval'
199
_timeout_milliseconds: Used when calling gobject.timeout_add()
200
_interval_milliseconds: - '' -
63
201
"""
64
def __init__(self, name=None, options=None, stop_hook=None,
65
dn=None, password=None, passfile=None, fqdn=None,
66
timeout=None, interval=-1):
67
self.name = name
68
self.dn = dn
69
if password:
70
self.password = password
71
elif passfile:
72
self.password = open(passfile).readall()
73
else:
74
raise RuntimeError(u"No Password or Passfile for client %s"
75
% self.name)
76
self.fqdn = fqdn # string
77
self.created = datetime.datetime.now()
78
self.last_seen = None
79
if timeout is None:
80
timeout = options.timeout
81
self.timeout = timeout
82
self.timeout_milliseconds = ((self.timeout.days
83
* 24 * 60 * 60 * 1000)
84
+ (self.timeout.seconds * 1000)
85
+ (self.timeout.microseconds
86
// 1000))
87
if interval == -1:
88
interval = options.interval
89
else:
90
interval = string_to_delta(interval)
91
self.interval = interval
92
self.interval_milliseconds = ((self.interval.days
202
def _set_timeout(self, timeout):
203
"Setter function for 'timeout' attribute"
204
self._timeout = timeout
205
self._timeout_milliseconds = ((self.timeout.days
93
206
* 24 * 60 * 60 * 1000)
94
+ (self.interval.seconds * 1000)
95
+ (self.interval.microseconds
207
+ (self.timeout.seconds * 1000)
208
+ (self.timeout.microseconds
96
209
// 1000))
210
timeout = property(lambda self: self._timeout,
211
_set_timeout)
212
del _set_timeout
213
def _set_interval(self, interval):
214
"Setter function for 'interval' attribute"
215
self._interval = interval
216
self._interval_milliseconds = ((self.interval.days
217
* 24 * 60 * 60 * 1000)
218
+ (self.interval.seconds
219
* 1000)
220
+ (self.interval.microseconds
221
// 1000))
222
interval = property(lambda self: self._interval,
223
_set_interval)
224
del _set_interval
225
def __init__(self, name = None, stop_hook=None, config={}):
226
"""Note: the 'checker' key in 'config' sets the
227
'checker_command' attribute and *not* the 'checker'
228
attribute."""
229
self.name = name
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
sf = open(config["secfile"])
241
self.secret = sf.read()
242
sf.close()
243
else:
244
raise TypeError(u"No secret or secfile for client %s"
245
% self.name)
246
self.host = config.get("host", "")
247
self.created = datetime.datetime.now()
248
self.last_checked_ok = None
249
self.timeout = string_to_delta(config["timeout"])
250
self.interval = string_to_delta(config["interval"])
97
251
self.stop_hook = stop_hook
98
252
self.checker = None
99
253
self.checker_initiator_tag = None
100
254
self.stop_initiator_tag = None
101
255
self.checker_callback_tag = None
256
self.check_command = config["checker"]
102
257
def start(self):
103
"""Start this clients checker and timeout hooks"""
258
"""Start this client's checker and timeout hooks"""
104
259
# Schedule a new checker to be started an 'interval' from now,
105
260
# and every interval from then on.
106
self.checker_initiator_tag = gobject.\
107
timeout_add(self.interval_milliseconds,
108
self.start_checker)
261
self.checker_initiator_tag = gobject.timeout_add\
262
(self._interval_milliseconds,
263
self.start_checker)
109
264
# Also start a new checker *right now*.
110
265
self.start_checker()
111
266
# Schedule a stop() when 'timeout' has passed
112
self.stop_initiator_tag = gobject.\
113
timeout_add(self.timeout_milliseconds,
114
self.stop)
267
self.stop_initiator_tag = gobject.timeout_add\
268
(self._timeout_milliseconds,
269
self.stop)
115
270
def stop(self):
116
271
"""Stop this client.
117
The possibility that this client might be restarted is left
118
open, but not currently used."""
119
# print "Stopping client", self.name
120
self.password = None
121
if self.stop_initiator_tag:
272
The possibility that a client might be restarted is left open,
273
but not currently used."""
274
# If this client doesn't have a secret, it is already stopped.
275
if hasattr(self, "secret") and self.secret:
276
logger.info(u"Stopping client %s", self.name)
277
self.secret = None
278
else:
279
return False
280
if getattr(self, "stop_initiator_tag", False):
122
281
gobject.source_remove(self.stop_initiator_tag)
123
282
self.stop_initiator_tag = None
124
if self.checker_initiator_tag:
283
if getattr(self, "checker_initiator_tag", False):
125
284
gobject.source_remove(self.checker_initiator_tag)
126
285
self.checker_initiator_tag = None
127
286
self.stop_checker()
130
289
# Do not run this again if called by a gobject.timeout_add
131
290
return False
132
291
def __del__(self):
133
# Some code duplication here and in stop()
134
if hasattr(self, "stop_initiator_tag") \
135
and self.stop_initiator_tag:
136
gobject.source_remove(self.stop_initiator_tag)
137
self.stop_initiator_tag = None
138
if hasattr(self, "checker_initiator_tag") \
139
and self.checker_initiator_tag:
140
gobject.source_remove(self.checker_initiator_tag)
141
self.checker_initiator_tag = None
142
self.stop_checker()
292
self.stop_hook = None
293
self.stop()
143
294
def checker_callback(self, pid, condition):
144
295
"""The checker has completed, so take appropriate actions."""
145
296
now = datetime.datetime.now()
297
self.checker_callback_tag = None
298
self.checker = None
146
299
if os.WIFEXITED(condition) \
147
300
and (os.WEXITSTATUS(condition) == 0):
148
#print "Checker for %(name)s succeeded" % vars(self)
149
self.last_seen = now
301
logger.info(u"Checker for %(name)s succeeded",
302
vars(self))
303
self.last_checked_ok = now
150
304
gobject.source_remove(self.stop_initiator_tag)
151
self.stop_initiator_tag = gobject.\
152
timeout_add(self.timeout_milliseconds,
153
self.stop)
154
#else:
155
# if not os.WIFEXITED(condition):
156
# print "Checker for %(name)s crashed?" % vars(self)
157
# else:
158
# print "Checker for %(name)s failed" % vars(self)
159
self.checker = None
160
self.checker_callback_tag = None
305
self.stop_initiator_tag = gobject.timeout_add\
306
(self._timeout_milliseconds,
307
self.stop)
308
elif not os.WIFEXITED(condition):
309
logger.warning(u"Checker for %(name)s crashed?",
310
vars(self))
311
else:
312
logger.info(u"Checker for %(name)s failed",
313
vars(self))
161
314
def start_checker(self):
162
315
"""Start a new checker subprocess if one is not running.
163
316
If a checker already exists, leave it running and do
164
317
nothing."""
318
# The reason for not killing a running checker is that if we
319
# did that, then if a checker (for some reason) started
320
# running slowly and taking more than 'interval' time, the
321
# client would inevitably timeout, since no checker would get
322
# a chance to run to completion. If we instead leave running
323
# checkers alone, the checker would have to take more time
324
# than 'timeout' for the client to be declared invalid, which
325
# is as it should be.
165
326
if self.checker is None:
166
#print "Starting checker for", self.name
167
try:
168
self.checker = subprocess.\
169
Popen("sleep 1; fping -q -- %s"
170
% re.escape(self.fqdn),
171
stdout=subprocess.PIPE,
172
close_fds=True, shell=True,
173
cwd="/")
174
self.checker_callback_tag = gobject.\
175
child_watch_add(self.checker.pid,
176
self.\
177
checker_callback)
178
except subprocess.OSError, error:
179
sys.stderr.write(u"Failed to start subprocess: %s\n"
180
% error)
327
try:
328
# In case check_command has exactly one % operator
329
command = self.check_command % self.host
330
except TypeError:
331
# Escape attributes for the shell
332
escaped_attrs = dict((key, re.escape(str(val)))
333
for key, val in
334
vars(self).iteritems())
335
try:
336
command = self.check_command % escaped_attrs
337
except TypeError, error:
338
logger.error(u'Could not format string "%s":'
339
u' %s', self.check_command, error)
340
return True # Try again later
341
try:
342
logger.info(u"Starting checker %r for %s",
343
command, self.name)
344
# We don't need to redirect stdout and stderr, since
345
# in normal mode, that is already done by daemon(),
346
# and in debug mode we don't want to. (Stdin is
347
# always replaced by /dev/null.)
348
self.checker = subprocess.Popen(command,
349
close_fds=True,
350
shell=True, cwd="/")
351
self.checker_callback_tag = gobject.child_watch_add\
352
(self.checker.pid,
353
self.checker_callback)
354
except OSError, error:
355
logger.error(u"Failed to start subprocess: %s",
356
error)
181
357
# Re-run this periodically if run by gobject.timeout_add
182
358
return True
183
359
def stop_checker(self):
184
360
"""Force the checker process, if any, to stop."""
185
if not hasattr(self, "checker") or self.checker is None:
361
if self.checker_callback_tag:
362
gobject.source_remove(self.checker_callback_tag)
363
self.checker_callback_tag = None
364
if getattr(self, "checker", None) is None:
186
365
return
187
gobject.source_remove(self.checker_callback_tag)
188
self.checker_callback_tag = None
189
os.kill(self.checker.pid, signal.SIGTERM)
190
if self.checker.poll() is None:
191
os.kill(self.checker.pid, signal.SIGKILL)
366
logger.debug(u"Stopping checker for %(name)s", vars(self))
367
try:
368
os.kill(self.checker.pid, signal.SIGTERM)
369
#os.sleep(0.5)
370
#if self.checker.poll() is None:
371
# os.kill(self.checker.pid, signal.SIGKILL)
372
except OSError, error:
373
if error.errno != errno.ESRCH: # No such process
374
raise
192
375
self.checker = None
193
def still_valid(self, now=None):
376
def still_valid(self):
194
377
"""Has the timeout not yet passed for this client?"""
195
if now is None:
196
now = datetime.datetime.now()
197
if self.last_seen is None:
378
now = datetime.datetime.now()
379
if self.last_checked_ok is None:
198
380
return now < (self.created + self.timeout)
199
381
else:
200
return now < (self.last_seen + self.timeout)
382
return now < (self.last_checked_ok + self.timeout)
383
384
385
def peer_certificate(session):
386
"Return the peer's OpenPGP certificate as a bytestring"
387
# If not an OpenPGP certificate...
388
if gnutls.library.functions.gnutls_certificate_type_get\
389
(session._c_object) \
390
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
391
# ...do the normal thing
392
return session.peer_certificate
393
list_size = ctypes.c_uint()
394
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
395
(session._c_object, ctypes.byref(list_size))
396
if list_size.value == 0:
397
return None
398
cert = cert_list[0]
399
return ctypes.string_at(cert.data, cert.size)
400
401
402
def fingerprint(openpgp):
403
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
404
# New GnuTLS "datum" with the OpenPGP public key
405
datum = gnutls.library.types.gnutls_datum_t\
406
(ctypes.cast(ctypes.c_char_p(openpgp),
407
ctypes.POINTER(ctypes.c_ubyte)),
408
ctypes.c_uint(len(openpgp)))
409
# New empty GnuTLS certificate
410
crt = gnutls.library.types.gnutls_openpgp_crt_t()
411
gnutls.library.functions.gnutls_openpgp_crt_init\
412
(ctypes.byref(crt))
413
# Import the OpenPGP public key into the certificate
414
gnutls.library.functions.gnutls_openpgp_crt_import\
415
(crt, ctypes.byref(datum),
416
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
417
# Verify the self signature in the key
418
crtverify = ctypes.c_uint();
419
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
420
(crt, 0, ctypes.byref(crtverify))
421
if crtverify.value != 0:
422
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
423
raise gnutls.errors.CertificateSecurityError("Verify failed")
424
# New buffer for the fingerprint
425
buffer = ctypes.create_string_buffer(20)
426
buffer_length = ctypes.c_size_t()
427
# Get the fingerprint from the certificate into the buffer
428
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
429
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
430
# Deinit the certificate
431
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
432
# Convert the buffer to a Python bytestring
433
fpr = ctypes.string_at(buffer, buffer_length.value)
434
# Convert the bytestring to hexadecimal notation
435
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
436
return hex_fpr
201
437
202
438
203
439
class tcp_handler(SocketServer.BaseRequestHandler, object):
204
440
"""A TCP request handler class.
205
441
Instantiated by IPv6_TCPServer for each request to handle it.
206
442
Note: This will run in its own forked process."""
443
207
444
def handle(self):
208
#print u"TCP request came"
209
#print u"Request:", self.request
210
#print u"Client Address:", self.client_address
211
#print u"Server:", self.server
212
session = gnutls.connection.ServerSession(self.request,
213
self.server\
214
.credentials)
445
logger.info(u"TCP connection from: %s",
446
unicode(self.client_address))
447
session = gnutls.connection.ClientSession\
448
(self.request, gnutls.connection.X509Credentials())
449
450
line = self.request.makefile().readline()
451
logger.debug(u"Protocol version: %r", line)
452
try:
453
if int(line.strip().split()[0]) > 1:
454
raise RuntimeError
455
except (ValueError, IndexError, RuntimeError), error:
456
logger.error(u"Unknown protocol version: %s", error)
457
return
458
459
# Note: gnutls.connection.X509Credentials is really a generic
460
# GnuTLS certificate credentials object so long as no X.509
461
# keys are added to it. Therefore, we can use it here despite
462
# using OpenPGP certificates.
463
464
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
465
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
466
# "+DHE-DSS"))
467
priority = "NORMAL" # Fallback default, since this
468
# MUST be set.
469
if self.server.settings["priority"]:
470
priority = self.server.settings["priority"]
471
gnutls.library.functions.gnutls_priority_set_direct\
472
(session._c_object, priority, None);
473
215
474
try:
216
475
session.handshake()
217
476
except gnutls.errors.GNUTLSError, error:
218
#sys.stderr.write(u"Handshake failed: %s\n" % error)
477
logger.warning(u"Handshake failed: %s", error)
219
478
# Do not run session.bye() here: the session is not
220
479
# established. Just abandon the request.
221
480
return
222
#if session.peer_certificate:
223
# print "DN:", session.peer_certificate.subject
224
481
try:
225
session.verify_peer()
226
except gnutls.errors.CertificateError, error:
227
#sys.stderr.write(u"Verify failed: %s\n" % error)
482
fpr = fingerprint(peer_certificate(session))
483
except (TypeError, gnutls.errors.GNUTLSError), error:
484
logger.warning(u"Bad certificate: %s", error)
228
485
session.bye()
229
486
return
487
logger.debug(u"Fingerprint: %s", fpr)
230
488
client = None
231
for c in clients:
232
if c.dn == session.peer_certificate.subject:
489
for c in self.server.clients:
490
if c.fingerprint == fpr:
233
491
client = c
234
492
break
493
if not client:
494
logger.warning(u"Client not found for fingerprint: %s",
495
fpr)
496
session.bye()
497
return
235
498
# Have to check if client.still_valid(), since it is possible
236
499
# that the client timed out while establishing the GnuTLS
237
500
# session.
238
if client and client.still_valid():
239
session.send(client.password)
240
else:
241
#if client:
242
# sys.stderr.write(u"Client %(name)s is invalid\n"
243
# % vars(client))
244
#else:
245
# sys.stderr.write(u"Client not found for DN: %s\n"
246
# % session.peer_certificate.subject)
247
#session.send("gazonk")
248
pass
501
if not client.still_valid():
502
logger.warning(u"Client %(name)s is invalid",
503
vars(client))
504
session.bye()
505
return
506
sent_size = 0
507
while sent_size < len(client.secret):
508
sent = session.send(client.secret[sent_size:])
509
logger.debug(u"Sent: %d, remaining: %d",
510
sent, len(client.secret)
511
- (sent_size + sent))
512
sent_size += sent
249
513
session.bye()
250
514
251
515
252
516
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
253
517
"""IPv6 TCP server. Accepts 'None' as address and/or port.
254
518
Attributes:
255
options: Command line options
519
settings: Server settings
256
520
clients: Set() of Client objects
257
credentials: GnuTLS X.509 credentials
521
enabled: Boolean; whether this server is activated yet
258
522
"""
259
523
address_family = socket.AF_INET6
260
524
def __init__(self, *args, **kwargs):
261
if "options" in kwargs:
262
self.options = kwargs["options"]
263
del kwargs["options"]
525
if "settings" in kwargs:
526
self.settings = kwargs["settings"]
527
del kwargs["settings"]
264
528
if "clients" in kwargs:
265
529
self.clients = kwargs["clients"]
266
530
del kwargs["clients"]
267
if "credentials" in kwargs:
268
self.credentials = kwargs["credentials"]
269
del kwargs["credentials"]
531
self.enabled = False
270
532
return super(type(self), self).__init__(*args, **kwargs)
271
533
def server_bind(self):
272
534
"""This overrides the normal server_bind() function
273
535
to bind to an interface if one was specified, and also NOT to
274
536
bind to an address or port if they were not specified."""
275
if self.options.interface:
276
if not hasattr(socket, "SO_BINDTODEVICE"):
277
# From /usr/include/asm-i486/socket.h
278
socket.SO_BINDTODEVICE = 25
537
if self.settings["interface"]:
538
# 25 is from /usr/include/asm-i486/socket.h
539
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
279
540
try:
280
541
self.socket.setsockopt(socket.SOL_SOCKET,
281
socket.SO_BINDTODEVICE,
282
self.options.interface)
542
SO_BINDTODEVICE,
543
self.settings["interface"])
283
544
except socket.error, error:
284
545
if error[0] == errno.EPERM:
285
sys.stderr.write(u"Warning: No permission to bind to interface %s\n"
286
% self.options.interface)
546
logger.error(u"No permission to"
547
u" bind to interface %s",
548
self.settings["interface"])
287
549
else:
288
550
raise error
289
551
# Only bind(2) the socket if we really need to.
292
554
in6addr_any = "::"
293
555
self.server_address = (in6addr_any,
294
556
self.server_address[1])
295
elif self.server_address[1] is None:
557
elif not self.server_address[1]:
296
558
self.server_address = (self.server_address[0],
297
559
0)
560
# if self.settings["interface"]:
561
# self.server_address = (self.server_address[0],
562
# 0, # port
563
# 0, # flowinfo
564
# if_nametoindex
565
# (self.settings
566
# ["interface"]))
298
567
return super(type(self), self).server_bind()
568
def server_activate(self):
569
if self.enabled:
570
return super(type(self), self).server_activate()
571
def enable(self):
572
self.enabled = True
299
573
300
574
301
575
def string_to_delta(interval):
311
585
datetime.timedelta(1)
312
586
>>> string_to_delta(u'1w')
313
587
datetime.timedelta(7)
588
>>> string_to_delta('5m 30s')
589
datetime.timedelta(0, 330)
314
590
"""
315
try:
316
suffix=unicode(interval[-1])
317
value=int(interval[:-1])
318
if suffix == u"d":
319
delta = datetime.timedelta(value)
320
elif suffix == u"s":
321
delta = datetime.timedelta(0, value)
322
elif suffix == u"m":
323
delta = datetime.timedelta(0, 0, 0, 0, value)
324
elif suffix == u"h":
325
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
326
elif suffix == u"w":
327
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
328
else:
591
timevalue = datetime.timedelta(0)
592
for s in interval.split():
593
try:
594
suffix=unicode(s[-1])
595
value=int(s[:-1])
596
if suffix == u"d":
597
delta = datetime.timedelta(value)
598
elif suffix == u"s":
599
delta = datetime.timedelta(0, value)
600
elif suffix == u"m":
601
delta = datetime.timedelta(0, 0, 0, 0, value)
602
elif suffix == u"h":
603
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
604
elif suffix == u"w":
605
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
606
else:
607
raise ValueError
608
except (ValueError, IndexError):
329
609
raise ValueError
330
except (ValueError, IndexError):
331
raise ValueError
332
return delta
333
334
335
def add_service():
336
"""From the Avahi server example code"""
337
global group, serviceName, serviceType, servicePort, serviceTXT, \
338
domain, host
339
if group is None:
340
group = dbus.Interface(
341
bus.get_object( avahi.DBUS_NAME,
342
server.EntryGroupNew()),
343
avahi.DBUS_INTERFACE_ENTRY_GROUP)
344
group.connect_to_signal('StateChanged',
345
entry_group_state_changed)
346
347
# print "Adding service '%s' of type '%s' ..." % (serviceName,
348
# serviceType)
349
350
group.AddService(
351
serviceInterface, # interface
352
avahi.PROTO_INET6, # protocol
353
dbus.UInt32(0), # flags
354
serviceName, serviceType,
355
domain, host,
356
dbus.UInt16(servicePort),
357
avahi.string_array_to_txt_array(serviceTXT))
358
group.Commit()
359
360
361
def remove_service():
362
"""From the Avahi server example code"""
363
global group
364
365
if not group is None:
366
group.Reset()
610
timevalue += delta
611
return timevalue
367
612
368
613
369
614
def server_state_changed(state):
370
"""From the Avahi server example code"""
615
"""Derived from the Avahi example code"""
371
616
if state == avahi.SERVER_COLLISION:
372
print "WARNING: Server name collision"
373
remove_service()
617
logger.error(u"Zeroconf server name collision")
618
service.remove()
374
619
elif state == avahi.SERVER_RUNNING:
375
add_service()
620
service.add()
376
621
377
622
378
623
def entry_group_state_changed(state, error):
379
"""From the Avahi server example code"""
380
global serviceName, server, rename_count
381
382
# print "state change: %i" % state
624
"""Derived from the Avahi example code"""
625
logger.debug(u"Avahi state change: %i", state)
383
626
384
627
if state == avahi.ENTRY_GROUP_ESTABLISHED:
385
pass
386
# print "Service established."
628
logger.debug(u"Zeroconf service established.")
387
629
elif state == avahi.ENTRY_GROUP_COLLISION:
388
389
rename_count = rename_count - 1
390
if rename_count > 0:
391
name = server.GetAlternativeServiceName(name)
392
print "WARNING: Service name collision, changing name to '%s' ..." % name
393
remove_service()
394
add_service()
395
396
else:
397
print "ERROR: No suitable service name found after %i retries, exiting." % n_rename
398
main_loop.quit()
630
logger.warning(u"Zeroconf service name collision.")
631
service.rename()
399
632
elif state == avahi.ENTRY_GROUP_FAILURE:
400
print "Error in group state changed", error
401
main_loop.quit()
402
return
403
633
logger.critical(u"Avahi: Error in group state changed %s",
634
unicode(error))
635
raise AvahiGroupError("State changed: %s", str(error))
404
636
405
637
def if_nametoindex(interface):
406
"""Call the C function if_nametoindex()"""
638
"""Call the C function if_nametoindex(), or equivalent"""
639
global if_nametoindex
407
640
try:
408
if "ctypes" not in sys.modules:
409
import ctypes
410
libc = ctypes.cdll.LoadLibrary("libc.so.6")
411
return libc.if_nametoindex(interface)
412
except (ImportError, OSError, AttributeError):
641
if "ctypes.util" not in sys.modules:
642
import ctypes.util
643
if_nametoindex = ctypes.cdll.LoadLibrary\
644
(ctypes.util.find_library("c")).if_nametoindex
645
except (OSError, AttributeError):
413
646
if "struct" not in sys.modules:
414
647
import struct
415
648
if "fcntl" not in sys.modules:
416
649
import fcntl
417
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
418
s = socket.socket()
419
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
420
struct.pack("16s16x", interface))
421
s.close()
422
interface_index = struct.unpack("I", ifreq[16:20])[0]
423
return interface_index
424
425
426
if __name__ == '__main__':
427
parser = OptionParser()
650
def if_nametoindex(interface):
651
"Get an interface index the hard way, i.e. using fcntl()"
652
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
653
s = socket.socket()
654
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
655
struct.pack("16s16x", interface))
656
s.close()
657
interface_index = struct.unpack("I", ifreq[16:20])[0]
658
return interface_index
659
return if_nametoindex(interface)
660
661
662
def daemon(nochdir = False, noclose = False):
663
"""See daemon(3). Standard BSD Unix function.
664
This should really exist as os.daemon, but it doesn't (yet)."""
665
if os.fork():
666
sys.exit()
667
os.setsid()
668
if not nochdir:
669
os.chdir("/")
670
if os.fork():
671
sys.exit()
672
if not noclose:
673
# Close all standard open file descriptors
674
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
675
if not stat.S_ISCHR(os.fstat(null).st_mode):
676
raise OSError(errno.ENODEV,
677
"/dev/null not a character device")
678
os.dup2(null, sys.stdin.fileno())
679
os.dup2(null, sys.stdout.fileno())
680
os.dup2(null, sys.stderr.fileno())
681
if null > 2:
682
os.close(null)
683
684
685
def main():
686
global main_loop_started
687
main_loop_started = False
688
689
parser = OptionParser(version = "%%prog %s" % version)
428
690
parser.add_option("-i", "--interface", type="string",
429
default=None, metavar="IF",
430
help="Bind to interface IF")
431
parser.add_option("--cert", type="string", default="cert.pem",
432
metavar="FILE",
433
help="Public key certificate PEM file to use")
434
parser.add_option("--key", type="string", default="key.pem",
435
metavar="FILE",
436
help="Private key PEM file to use")
437
parser.add_option("--ca", type="string", default="ca.pem",
438
metavar="FILE",
439
help="Certificate Authority certificate PEM file to use")
440
parser.add_option("--crl", type="string", default="crl.pem",
441
metavar="FILE",
442
help="Certificate Revokation List PEM file to use")
443
parser.add_option("-p", "--port", type="int", default=None,
691
metavar="IF", help="Bind to interface IF")
692
parser.add_option("-a", "--address", type="string",
693
help="Address to listen for requests on")
694
parser.add_option("-p", "--port", type="int",
444
695
help="Port number to receive requests on")
445
parser.add_option("--timeout", type="string", # Parsed later
446
default="1h",
447
help="Amount of downtime allowed for clients")
448
parser.add_option("--interval", type="string", # Parsed later
449
default="5m",
450
help="How often to check that a client is up")
451
696
parser.add_option("--check", action="store_true", default=False,
452
697
help="Run self-test")
698
parser.add_option("--debug", action="store_true",
699
help="Debug mode; run in foreground and log to"
700
" terminal")
701
parser.add_option("--priority", type="string", help="GnuTLS"
702
" priority string (see GnuTLS documentation)")
703
parser.add_option("--servicename", type="string", metavar="NAME",
704
help="Zeroconf service name")
705
parser.add_option("--configdir", type="string",
706
default="/etc/mandos", metavar="DIR",
707
help="Directory to search for configuration"
708
" files")
453
709
(options, args) = parser.parse_args()
454
710
455
711
if options.check:
457
713
doctest.testmod()
458
714
sys.exit()
459
715
460
# Parse the time arguments
461
try:
462
options.timeout = string_to_delta(options.timeout)
463
except ValueError:
464
parser.error("option --timeout: Unparseable time")
465
try:
466
options.interval = string_to_delta(options.interval)
467
except ValueError:
468
parser.error("option --interval: Unparseable time")
469
470
cert = gnutls.crypto.X509Certificate(open(options.cert).read())
471
key = gnutls.crypto.X509PrivateKey(open(options.key).read())
472
ca = gnutls.crypto.X509Certificate(open(options.ca).read())
473
crl = gnutls.crypto.X509CRL(open(options.crl).read())
474
cred = gnutls.connection.X509Credentials(cert, key, [ca], [crl])
475
476
# Parse config file
477
defaults = {}
478
client_config = ConfigParser.SafeConfigParser(defaults)
479
#client_config.readfp(open("secrets.conf"), "secrets.conf")
480
client_config.read("mandos-clients.conf")
481
482
# From the Avahi server example code
716
# Default values for config file for server-global settings
717
server_defaults = { "interface": "",
718
"address": "",
719
"port": "",
720
"debug": "False",
721
"priority":
722
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
723
"servicename": "Mandos",
724
}
725
726
# Parse config file for server-global settings
727
server_config = ConfigParser.SafeConfigParser(server_defaults)
728
del server_defaults
729
server_config.read(os.path.join(options.configdir, "mandos.conf"))
730
# Convert the SafeConfigParser object to a dict
731
server_settings = server_config.defaults()
732
# Use getboolean on the boolean config option
733
server_settings["debug"] = server_config.getboolean\
734
("DEFAULT", "debug")
735
del server_config
736
737
# Override the settings from the config file with command line
738
# options, if set.
739
for option in ("interface", "address", "port", "debug",
740
"priority", "servicename", "configdir"):
741
value = getattr(options, option)
742
if value is not None:
743
server_settings[option] = value
744
del options
745
# Now we have our good server settings in "server_settings"
746
747
debug = server_settings["debug"]
748
749
if not debug:
750
syslogger.setLevel(logging.WARNING)
751
console.setLevel(logging.WARNING)
752
753
if server_settings["servicename"] != "Mandos":
754
syslogger.setFormatter(logging.Formatter\
755
('Mandos (%s): %%(levelname)s:'
756
' %%(message)s'
757
% server_settings["servicename"]))
758
759
# Parse config file with clients
760
client_defaults = { "timeout": "1h",
761
"interval": "5m",
762
"checker": "fping -q -- %(host)s",
763
"host": "",
764
}
765
client_config = ConfigParser.SafeConfigParser(client_defaults)
766
client_config.read(os.path.join(server_settings["configdir"],
767
"clients.conf"))
768
769
clients = Set()
770
tcp_server = IPv6_TCPServer((server_settings["address"],
771
server_settings["port"]),
772
tcp_handler,
773
settings=server_settings,
774
clients=clients)
775
pidfilename = "/var/run/mandos.pid"
776
try:
777
pidfile = open(pidfilename, "w")
778
except IOError, error:
779
logger.error("Could not open file %r", pidfilename)
780
781
uid = 65534
782
gid = 65534
783
try:
784
uid = pwd.getpwnam("mandos").pw_uid
785
except KeyError:
786
try:
787
uid = pwd.getpwnam("nobody").pw_uid
788
except KeyError:
789
pass
790
try:
791
gid = pwd.getpwnam("mandos").pw_gid
792
except KeyError:
793
try:
794
gid = pwd.getpwnam("nogroup").pw_gid
795
except KeyError:
796
pass
797
try:
798
os.setuid(uid)
799
os.setgid(gid)
800
except OSError, error:
801
if error[0] != errno.EPERM:
802
raise error
803
804
global service
805
service = AvahiService(name = server_settings["servicename"],
806
type = "_mandos._tcp", );
807
if server_settings["interface"]:
808
service.interface = if_nametoindex\
809
(server_settings["interface"])
810
811
global main_loop
812
global bus
813
global server
814
# From the Avahi example code
483
815
DBusGMainLoop(set_as_default=True )
484
816
main_loop = gobject.MainLoop()
485
817
bus = dbus.SystemBus()
486
server = dbus.Interface(
487
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
488
avahi.DBUS_INTERFACE_SERVER )
818
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
819
avahi.DBUS_PATH_SERVER),
820
avahi.DBUS_INTERFACE_SERVER)
489
821
# End of Avahi example code
490
822
491
clients = Set()
492
823
def remove_from_clients(client):
493
824
clients.remove(client)
494
825
if not clients:
495
print "No clients left, exiting"
496
main_loop.quit()
826
logger.critical(u"No clients left, exiting")
827
sys.exit()
497
828
498
clients.update(Set(Client(name=section, options=options,
829
clients.update(Set(Client(name = section,
499
830
stop_hook = remove_from_clients,
500
**(dict(client_config\
501
.items(section))))
831
config
832
= dict(client_config.items(section)))
502
833
for section in client_config.sections()))
834
if not clients:
835
logger.critical(u"No clients defined")
836
sys.exit(1)
837
838
if debug:
839
# Redirect stdin so all checkers get /dev/null
840
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
841
os.dup2(null, sys.stdin.fileno())
842
if null > 2:
843
os.close(null)
844
else:
845
# No console logging
846
logger.removeHandler(console)
847
# Close all input and output, do double fork, etc.
848
daemon()
849
850
try:
851
pid = os.getpid()
852
pidfile.write(str(pid) + "\n")
853
pidfile.close()
854
del pidfile
855
except IOError, err:
856
logger.error(u"Could not write to file %r with PID %d",
857
pidfilename, pid)
858
except NameError:
859
# "pidfile" was never created
860
pass
861
del pidfilename
862
863
def cleanup():
864
"Cleanup function; run on exit"
865
global group
866
# From the Avahi example code
867
if not group is None:
868
group.Free()
869
group = None
870
# End of Avahi example code
871
872
while clients:
873
client = clients.pop()
874
client.stop_hook = None
875
client.stop()
876
877
atexit.register(cleanup)
878
879
if not debug:
880
signal.signal(signal.SIGINT, signal.SIG_IGN)
881
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
882
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
883
503
884
for client in clients:
504
885
client.start()
505
886
506
tcp_server = IPv6_TCPServer((None, options.port),
507
tcp_handler,
508
options=options,
509
clients=clients,
510
credentials=cred)
511
# Find out what random port we got
512
servicePort = tcp_server.socket.getsockname()[1]
513
#sys.stderr.write("Now listening on port %d\n" % servicePort)
514
515
if options.interface is not None:
516
serviceInterface = if_nametoindex(options.interface)
517
518
# From the Avahi server example code
519
server.connect_to_signal("StateChanged", server_state_changed)
520
server_state_changed(server.GetState())
521
# End of Avahi example code
522
523
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
524
lambda *args, **kwargs:
525
tcp_server.handle_request(*args[2:],
526
**kwargs) or True)
887
tcp_server.enable()
888
tcp_server.server_activate()
889
890
# Find out what port we got
891
service.port = tcp_server.socket.getsockname()[1]
892
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
893
u" scope_id %d" % tcp_server.socket.getsockname())
894
895
#service.interface = tcp_server.socket.getsockname()[3]
896
527
897
try:
898
# From the Avahi example code
899
server.connect_to_signal("StateChanged", server_state_changed)
900
try:
901
server_state_changed(server.GetState())
902
except dbus.exceptions.DBusException, error:
903
logger.critical(u"DBusException: %s", error)
904
sys.exit(1)
905
# End of Avahi example code
906
907
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
908
lambda *args, **kwargs:
909
tcp_server.handle_request\
910
(*args[2:], **kwargs) or True)
911
912
logger.debug(u"Starting main loop")
913
main_loop_started = True
528
914
main_loop.run()
915
except AvahiError, error:
916
logger.critical(u"AvahiError: %s" + unicode(error))
917
sys.exit(1)
529
918
except KeyboardInterrupt:
530
print
531
532
# Cleanup here
919
if debug:
920
print
533
921
534
# From the Avahi server example code
535
if not group is None:
536
group.Free()
537
# End of Avahi example code
538
539
for client in clients:
540
client.stop_hook = None
541
client.stop()
922
if __name__ == '__main__':
923
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0