47
15
import gnutls.library.functions
48
16
import gnutls.library.constants
49
17
import gnutls.library.types
50
import ConfigParser as configparser
59
import logging.handlers
65
import cPickle as pickle
66
import multiprocessing
77
31
from dbus.mainloop.glib import DBusGMainLoop
80
import xml.dom.minidom
84
SO_BINDTODEVICE = socket.SO_BINDTODEVICE
85
except AttributeError:
87
from IN import SO_BINDTODEVICE
89
SO_BINDTODEVICE = None
91
if sys.version_info.major == 2:
95
stored_state_file = "clients.pickle"
97
logger = logging.getLogger()
101
if_nametoindex = (ctypes.cdll.LoadLibrary
102
(ctypes.util.find_library("c"))
104
except (OSError, AttributeError):
105
def if_nametoindex(interface):
106
"Get an interface index the hard way, i.e. using fcntl()"
107
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
108
with contextlib.closing(socket.socket()) as s:
109
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
110
struct.pack(b"16s16x", interface))
111
interface_index = struct.unpack("I", ifreq[16:20])[0]
112
return interface_index
115
def initlogger(debug, level=logging.WARNING):
116
"""init logger and add loglevel"""
119
syslogger = (logging.handlers.SysLogHandler
121
logging.handlers.SysLogHandler.LOG_DAEMON,
122
address = "/dev/log"))
123
syslogger.setFormatter(logging.Formatter
124
('Mandos [%(process)d]: %(levelname)s:'
126
logger.addHandler(syslogger)
129
console = logging.StreamHandler()
130
console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
134
logger.addHandler(console)
135
logger.setLevel(level)
138
class PGPError(Exception):
139
"""Exception if encryption/decryption fails"""
143
class PGPEngine(object):
144
"""A simple class for OpenPGP symmetric encryption & decryption"""
146
self.tempdir = tempfile.mkdtemp(prefix="mandos-")
147
self.gnupgargs = ['--batch',
148
'--home', self.tempdir,
156
def __exit__(self, exc_type, exc_value, traceback):
164
if self.tempdir is not None:
165
# Delete contents of tempdir
166
for root, dirs, files in os.walk(self.tempdir,
168
for filename in files:
169
os.remove(os.path.join(root, filename))
171
os.rmdir(os.path.join(root, dirname))
173
os.rmdir(self.tempdir)
176
def password_encode(self, password):
177
# Passphrase can not be empty and can not contain newlines or
178
# NUL bytes. So we prefix it and hex encode it.
179
encoded = b"mandos" + binascii.hexlify(password)
180
if len(encoded) > 2048:
181
# GnuPG can't handle long passwords, so encode differently
182
encoded = (b"mandos" + password.replace(b"\\", b"\\\\")
183
.replace(b"\n", b"\\n")
184
.replace(b"\0", b"\\x00"))
187
def encrypt(self, data, password):
188
passphrase = self.password_encode(password)
189
with tempfile.NamedTemporaryFile(dir=self.tempdir
191
passfile.write(passphrase)
193
proc = subprocess.Popen(['gpg', '--symmetric',
197
stdin = subprocess.PIPE,
198
stdout = subprocess.PIPE,
199
stderr = subprocess.PIPE)
200
ciphertext, err = proc.communicate(input = data)
201
if proc.returncode != 0:
205
def decrypt(self, data, password):
206
passphrase = self.password_encode(password)
207
with tempfile.NamedTemporaryFile(dir = self.tempdir
209
passfile.write(passphrase)
211
proc = subprocess.Popen(['gpg', '--decrypt',
215
stdin = subprocess.PIPE,
216
stdout = subprocess.PIPE,
217
stderr = subprocess.PIPE)
218
decrypted_plaintext, err = proc.communicate(input
220
if proc.returncode != 0:
222
return decrypted_plaintext
225
class AvahiError(Exception):
226
def __init__(self, value, *args, **kwargs):
228
return super(AvahiError, self).__init__(value, *args,
231
class AvahiServiceError(AvahiError):
234
class AvahiGroupError(AvahiError):
238
class AvahiService(object):
239
"""An Avahi (Zeroconf) service.
242
interface: integer; avahi.IF_UNSPEC or an interface index.
243
Used to optionally bind to the specified interface.
244
name: string; Example: 'Mandos'
245
type: string; Example: '_mandos._tcp'.
246
See <https://www.iana.org/assignments/service-names-port-numbers>
247
port: integer; what port to announce
248
TXT: list of strings; TXT record for the service
249
domain: string; Domain to publish on, default to .local if empty.
250
host: string; Host to publish records for, default is localhost
251
max_renames: integer; maximum number of renames
252
rename_count: integer; counter so we only rename after collisions
253
a sensible number of times
254
group: D-Bus Entry Group
256
bus: dbus.SystemBus()
259
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
260
servicetype = None, port = None, TXT = None,
261
domain = "", host = "", max_renames = 32768,
262
protocol = avahi.PROTO_UNSPEC, bus = None):
263
self.interface = interface
265
self.type = servicetype
267
self.TXT = TXT if TXT is not None else []
270
self.rename_count = 0
271
self.max_renames = max_renames
272
self.protocol = protocol
273
self.group = None # our entry group
276
self.entry_group_state_changed_match = None
278
def rename(self, remove=True):
279
"""Derived from the Avahi example code"""
280
if self.rename_count >= self.max_renames:
281
logger.critical("No suitable Zeroconf service name found"
282
" after %i retries, exiting.",
284
raise AvahiServiceError("Too many renames")
285
self.name = str(self.server
286
.GetAlternativeServiceName(self.name))
287
self.rename_count += 1
288
logger.info("Changing Zeroconf service name to %r ...",
294
except dbus.exceptions.DBusException as error:
295
if (error.get_dbus_name()
296
== "org.freedesktop.Avahi.CollisionError"):
297
logger.info("Local Zeroconf service name collision.")
298
return self.rename(remove=False)
300
logger.critical("D-Bus Exception", exc_info=error)
305
"""Derived from the Avahi example code"""
306
if self.entry_group_state_changed_match is not None:
307
self.entry_group_state_changed_match.remove()
308
self.entry_group_state_changed_match = None
309
if self.group is not None:
313
"""Derived from the Avahi example code"""
315
if self.group is None:
316
self.group = dbus.Interface(
317
self.bus.get_object(avahi.DBUS_NAME,
318
self.server.EntryGroupNew()),
319
avahi.DBUS_INTERFACE_ENTRY_GROUP)
320
self.entry_group_state_changed_match = (
321
self.group.connect_to_signal(
322
'StateChanged', self.entry_group_state_changed))
323
logger.debug("Adding Zeroconf service '%s' of type '%s' ...",
324
self.name, self.type)
325
self.group.AddService(
328
dbus.UInt32(0), # flags
329
self.name, self.type,
330
self.domain, self.host,
331
dbus.UInt16(self.port),
332
avahi.string_array_to_txt_array(self.TXT))
335
def entry_group_state_changed(self, state, error):
336
"""Derived from the Avahi example code"""
337
logger.debug("Avahi entry group state change: %i", state)
339
if state == avahi.ENTRY_GROUP_ESTABLISHED:
340
logger.debug("Zeroconf service established.")
341
elif state == avahi.ENTRY_GROUP_COLLISION:
342
logger.info("Zeroconf service name collision.")
344
elif state == avahi.ENTRY_GROUP_FAILURE:
345
logger.critical("Avahi: Error in group state changed %s",
347
raise AvahiGroupError("State changed: {!s}"
351
"""Derived from the Avahi example code"""
352
if self.group is not None:
355
except (dbus.exceptions.UnknownMethodException,
356
dbus.exceptions.DBusException):
361
def server_state_changed(self, state, error=None):
362
"""Derived from the Avahi example code"""
363
logger.debug("Avahi server state change: %i", state)
364
bad_states = { avahi.SERVER_INVALID:
365
"Zeroconf server invalid",
366
avahi.SERVER_REGISTERING: None,
367
avahi.SERVER_COLLISION:
368
"Zeroconf server name collision",
369
avahi.SERVER_FAILURE:
370
"Zeroconf server failure" }
371
if state in bad_states:
372
if bad_states[state] is not None:
374
logger.error(bad_states[state])
376
logger.error(bad_states[state] + ": %r", error)
378
elif state == avahi.SERVER_RUNNING:
382
logger.debug("Unknown state: %r", state)
384
logger.debug("Unknown state: %r: %r", state, error)
387
"""Derived from the Avahi example code"""
388
if self.server is None:
389
self.server = dbus.Interface(
390
self.bus.get_object(avahi.DBUS_NAME,
391
avahi.DBUS_PATH_SERVER,
392
follow_name_owner_changes=True),
393
avahi.DBUS_INTERFACE_SERVER)
394
self.server.connect_to_signal("StateChanged",
395
self.server_state_changed)
396
self.server_state_changed(self.server.GetState())
399
class AvahiServiceToSyslog(AvahiService):
400
def rename(self, *args, **kwargs):
401
"""Add the new name to the syslog messages"""
402
ret = AvahiService.rename(self, *args, **kwargs)
403
syslogger.setFormatter(logging.Formatter
404
('Mandos ({}) [%(process)d]:'
405
' %(levelname)s: %(message)s'
35
import logging.handlers
37
logger = logging.Logger('mandos')
38
syslogger = logging.handlers.SysLogHandler\
39
(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
40
syslogger.setFormatter(logging.Formatter\
41
('%(levelname)s: %(message)s'))
42
logger.addHandler(syslogger)
45
# This variable is used to optionally bind to a specified interface.
46
# It is a global variable to fit in with the other variables from the
47
# Avahi server example code.
48
serviceInterface = avahi.IF_UNSPEC
49
# From the Avahi server example code:
50
serviceName = "Mandos"
51
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
52
servicePort = None # Not known at startup
53
serviceTXT = [] # TXT record for the service
54
domain = "" # Domain to publish on, default to .local
55
host = "" # Host to publish records for, default to localhost
56
group = None #our entry group
57
rename_count = 12 # Counter so we only rename after collisions a
58
# sensible number of times
59
# End of Avahi example code
410
62
class Client(object):
411
63
"""A representation of a client host served by this server.
414
approved: bool(); 'None' if not yet approved/disapproved
415
approval_delay: datetime.timedelta(); Time to wait for approval
416
approval_duration: datetime.timedelta(); Duration of one approval
417
checker: subprocess.Popen(); a running checker process used
418
to see if the client lives.
419
'None' if no process is running.
420
checker_callback_tag: a gobject event source tag, or None
421
checker_command: string; External command which is run to check
422
if client lives. %() expansions are done at
65
name: string; from the config file, used in log messages
66
fingerprint: string (40 or 32 hexadecimal digits); used to
67
uniquely identify the client
68
secret: bytestring; sent verbatim (over TLS) to client
69
fqdn: string (FQDN); available for use by the checker command
70
created: datetime.datetime()
71
last_seen: datetime.datetime() or None if not yet seen
72
timeout: datetime.timedelta(); How long from last_seen until
73
this client is invalid
74
interval: datetime.timedelta(); How often to start a new checker
75
stop_hook: If set, called by stop() as stop_hook(self)
76
checker: subprocess.Popen(); a running checker process used
77
to see if the client lives.
78
Is None if no process is running.
79
checker_initiator_tag: a gobject event source tag, or None
80
stop_initiator_tag: - '' -
81
checker_callback_tag: - '' -
82
checker_command: string; External command which is run to check if
83
client lives. %()s expansions are done at
423
84
runtime with vars(self) as dict, so that for
424
85
instance %(name)s can be used in the command.
425
checker_initiator_tag: a gobject event source tag, or None
426
created: datetime.datetime(); (UTC) object creation
427
client_structure: Object describing what attributes a client has
428
and is used for storing the client at exit
429
current_checker_command: string; current running checker_command
430
disable_initiator_tag: a gobject event source tag, or None
432
fingerprint: string (40 or 32 hexadecimal digits); used to
433
uniquely identify the client
434
host: string; available for use by the checker command
435
interval: datetime.timedelta(); How often to start a new checker
436
last_approval_request: datetime.datetime(); (UTC) or None
437
last_checked_ok: datetime.datetime(); (UTC) or None
438
last_checker_status: integer between 0 and 255 reflecting exit
439
status of last checker. -1 reflects crashed
440
checker, -2 means no checker completed yet.
441
last_enabled: datetime.datetime(); (UTC) or None
442
name: string; from the config file, used in log messages and
444
secret: bytestring; sent verbatim (over TLS) to client
445
timeout: datetime.timedelta(); How long from last_checked_ok
446
until this client is disabled
447
extended_timeout: extra long timeout when secret has been sent
448
runtime_expansions: Allowed attributes for runtime expansion.
449
expires: datetime.datetime(); time (UTC) when a client will be
451
server_settings: The server_settings dict from main()
87
_timeout: Real variable for 'timeout'
88
_interval: Real variable for 'interval'
89
_timeout_milliseconds: Used by gobject.timeout_add()
90
_interval_milliseconds: - '' -
454
runtime_expansions = ("approval_delay", "approval_duration",
455
"created", "enabled", "expires",
456
"fingerprint", "host", "interval",
457
"last_approval_request", "last_checked_ok",
458
"last_enabled", "name", "timeout")
459
client_defaults = { "timeout": "PT5M",
460
"extended_timeout": "PT15M",
462
"checker": "fping -q -- %%(host)s",
464
"approval_delay": "PT0S",
465
"approval_duration": "PT1S",
466
"approved_by_default": "True",
471
def config_parser(config):
472
"""Construct a new dict of client settings of this form:
473
{ client_name: {setting_name: value, ...}, ...}
474
with exceptions for any special settings as defined above.
475
NOTE: Must be a pure function. Must return the same result
476
value given the same arguments.
479
for client_name in config.sections():
480
section = dict(config.items(client_name))
481
client = settings[client_name] = {}
483
client["host"] = section["host"]
484
# Reformat values from string types to Python types
485
client["approved_by_default"] = config.getboolean(
486
client_name, "approved_by_default")
487
client["enabled"] = config.getboolean(client_name,
490
# Uppercase and remove spaces from fingerprint for later
491
# comparison purposes with return value from the
492
# fingerprint() function
493
client["fingerprint"] = (section["fingerprint"].upper()
495
if "secret" in section:
496
client["secret"] = section["secret"].decode("base64")
497
elif "secfile" in section:
498
with open(os.path.expanduser(os.path.expandvars
499
(section["secfile"])),
501
client["secret"] = secfile.read()
503
raise TypeError("No secret or secfile for section {}"
505
client["timeout"] = string_to_delta(section["timeout"])
506
client["extended_timeout"] = string_to_delta(
507
section["extended_timeout"])
508
client["interval"] = string_to_delta(section["interval"])
509
client["approval_delay"] = string_to_delta(
510
section["approval_delay"])
511
client["approval_duration"] = string_to_delta(
512
section["approval_duration"])
513
client["checker_command"] = section["checker"]
514
client["last_approval_request"] = None
515
client["last_checked_ok"] = None
516
client["last_checker_status"] = -2
520
def __init__(self, settings, name = None, server_settings=None):
92
def _set_timeout(self, timeout):
93
"Setter function for 'timeout' attribute"
94
self._timeout = timeout
95
self._timeout_milliseconds = ((self.timeout.days
96
* 24 * 60 * 60 * 1000)
97
+ (self.timeout.seconds * 1000)
98
+ (self.timeout.microseconds
100
timeout = property(lambda self: self._timeout,
103
def _set_interval(self, interval):
104
"Setter function for 'interval' attribute"
105
self._interval = interval
106
self._interval_milliseconds = ((self.interval.days
107
* 24 * 60 * 60 * 1000)
108
+ (self.interval.seconds
110
+ (self.interval.microseconds
112
interval = property(lambda self: self._interval,
115
def __init__(self, name=None, options=None, stop_hook=None,
116
fingerprint=None, secret=None, secfile=None,
117
fqdn=None, timeout=None, interval=-1, checker=None):
522
if server_settings is None:
524
self.server_settings = server_settings
525
# adding all client settings
526
for setting, value in settings.items():
527
setattr(self, setting, value)
530
if not hasattr(self, "last_enabled"):
531
self.last_enabled = datetime.datetime.utcnow()
532
if not hasattr(self, "expires"):
533
self.expires = (datetime.datetime.utcnow()
536
self.last_enabled = None
539
logger.debug("Creating client %r", self.name)
540
logger.debug(" Fingerprint: %s", self.fingerprint)
541
self.created = settings.get("created",
542
datetime.datetime.utcnow())
544
# attributes specific for this server instance
119
# Uppercase and remove spaces from fingerprint
120
# for later comparison purposes with return value of
121
# the fingerprint() function
122
self.fingerprint = fingerprint.upper().replace(u" ", u"")
124
self.secret = secret.decode(u"base64")
127
self.secret = sf.read()
130
raise RuntimeError(u"No secret or secfile for client %s"
132
self.fqdn = fqdn # string
133
self.created = datetime.datetime.now()
134
self.last_seen = None
136
self.timeout = options.timeout
138
self.timeout = string_to_delta(timeout)
140
self.interval = options.interval
142
self.interval = string_to_delta(interval)
143
self.stop_hook = stop_hook
545
144
self.checker = None
546
145
self.checker_initiator_tag = None
547
self.disable_initiator_tag = None
146
self.stop_initiator_tag = None
548
147
self.checker_callback_tag = None
549
self.current_checker_command = None
551
self.approvals_pending = 0
552
self.changedstate = (multiprocessing_manager
553
.Condition(multiprocessing_manager
555
self.client_structure = [attr for attr in
556
self.__dict__.iterkeys()
557
if not attr.startswith("_")]
558
self.client_structure.append("client_structure")
560
for name, t in inspect.getmembers(type(self),
564
if not name.startswith("_"):
565
self.client_structure.append(name)
567
# Send notice to process children that client state has changed
568
def send_changedstate(self):
569
with self.changedstate:
570
self.changedstate.notify_all()
573
"""Start this client's checker and timeout hooks"""
574
if getattr(self, "enabled", False):
577
self.expires = datetime.datetime.utcnow() + self.timeout
579
self.last_enabled = datetime.datetime.utcnow()
581
self.send_changedstate()
583
def disable(self, quiet=True):
584
"""Disable this client."""
585
if not getattr(self, "enabled", False):
588
logger.info("Disabling client %s", self.name)
589
if getattr(self, "disable_initiator_tag", None) is not None:
590
gobject.source_remove(self.disable_initiator_tag)
591
self.disable_initiator_tag = None
593
if getattr(self, "checker_initiator_tag", None) is not None:
594
gobject.source_remove(self.checker_initiator_tag)
595
self.checker_initiator_tag = None
599
self.send_changedstate()
600
# Do not run this again if called by a gobject.timeout_add
606
def init_checker(self):
148
self.check_command = checker
150
"""Start this clients checker and timeout hooks"""
607
151
# Schedule a new checker to be started an 'interval' from now,
608
152
# and every interval from then on.
609
if self.checker_initiator_tag is not None:
610
gobject.source_remove(self.checker_initiator_tag)
611
self.checker_initiator_tag = (gobject.timeout_add
613
.total_seconds() * 1000),
615
# Schedule a disable() when 'timeout' has passed
616
if self.disable_initiator_tag is not None:
617
gobject.source_remove(self.disable_initiator_tag)
618
self.disable_initiator_tag = (gobject.timeout_add
620
.total_seconds() * 1000),
153
self.checker_initiator_tag = gobject.timeout_add\
154
(self._interval_milliseconds,
622
156
# Also start a new checker *right now*.
623
157
self.start_checker()
625
def checker_callback(self, pid, condition, command):
158
# Schedule a stop() when 'timeout' has passed
159
self.stop_initiator_tag = gobject.timeout_add\
160
(self._timeout_milliseconds,
164
The possibility that this client might be restarted is left
165
open, but not currently used."""
166
logger.debug(u"Stopping client %s", self.name)
168
if self.stop_initiator_tag:
169
gobject.source_remove(self.stop_initiator_tag)
170
self.stop_initiator_tag = None
171
if self.checker_initiator_tag:
172
gobject.source_remove(self.checker_initiator_tag)
173
self.checker_initiator_tag = None
177
# Do not run this again if called by a gobject.timeout_add
180
# Some code duplication here and in stop()
181
if hasattr(self, "stop_initiator_tag") \
182
and self.stop_initiator_tag:
183
gobject.source_remove(self.stop_initiator_tag)
184
self.stop_initiator_tag = None
185
if hasattr(self, "checker_initiator_tag") \
186
and self.checker_initiator_tag:
187
gobject.source_remove(self.checker_initiator_tag)
188
self.checker_initiator_tag = None
190
def checker_callback(self, pid, condition):
626
191
"""The checker has completed, so take appropriate actions."""
627
self.checker_callback_tag = None
629
if os.WIFEXITED(condition):
630
self.last_checker_status = os.WEXITSTATUS(condition)
631
if self.last_checker_status == 0:
632
logger.info("Checker for %(name)s succeeded",
636
logger.info("Checker for %(name)s failed",
639
self.last_checker_status = -1
640
logger.warning("Checker for %(name)s crashed?",
192
now = datetime.datetime.now()
193
if os.WIFEXITED(condition) \
194
and (os.WEXITSTATUS(condition) == 0):
195
logger.debug(u"Checker for %(name)s succeeded",
198
gobject.source_remove(self.stop_initiator_tag)
199
self.stop_initiator_tag = gobject.timeout_add\
200
(self._timeout_milliseconds,
202
elif not os.WIFEXITED(condition):
203
logger.warning(u"Checker for %(name)s crashed?",
643
def checked_ok(self):
644
"""Assert that the client has been seen, alive and well."""
645
self.last_checked_ok = datetime.datetime.utcnow()
646
self.last_checker_status = 0
649
def bump_timeout(self, timeout=None):
650
"""Bump up the timeout for this client."""
652
timeout = self.timeout
653
if self.disable_initiator_tag is not None:
654
gobject.source_remove(self.disable_initiator_tag)
655
self.disable_initiator_tag = None
656
if getattr(self, "enabled", False):
657
self.disable_initiator_tag = (gobject.timeout_add
658
(int(timeout.total_seconds()
659
* 1000), self.disable))
660
self.expires = datetime.datetime.utcnow() + timeout
662
def need_approval(self):
663
self.last_approval_request = datetime.datetime.utcnow()
206
logger.debug(u"Checker for %(name)s failed",
209
self.checker_callback_tag = None
665
210
def start_checker(self):
666
211
"""Start a new checker subprocess if one is not running.
668
212
If a checker already exists, leave it running and do
670
# The reason for not killing a running checker is that if we
671
# did that, and if a checker (for some reason) started running
672
# slowly and taking more than 'interval' time, then the client
673
# would inevitably timeout, since no checker would get a
674
# chance to run to completion. If we instead leave running
675
# checkers alone, the checker would have to take more time
676
# than 'timeout' for the client to be disabled, which is as it
679
# If a checker exists, make sure it is not a zombie
681
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
682
except AttributeError:
684
except OSError as error:
685
if error.errno != errno.ECHILD:
689
logger.warning("Checker was a zombie")
690
gobject.source_remove(self.checker_callback_tag)
691
self.checker_callback(pid, status,
692
self.current_checker_command)
693
# Start a new checker if needed
694
214
if self.checker is None:
695
# Escape attributes for the shell
696
escaped_attrs = { attr:
697
re.escape(str(getattr(self, attr)))
698
for attr in self.runtime_expansions }
700
command = self.checker_command % escaped_attrs
701
except TypeError as error:
702
logger.error('Could not format string "%s"',
703
self.checker_command, exc_info=error)
704
return True # Try again later
705
self.current_checker_command = command
707
logger.info("Starting checker %r for %s",
709
# We don't need to redirect stdout and stderr, since
710
# in normal mode, that is already done by daemon(),
711
# and in debug mode we don't want to. (Stdin is
712
# always replaced by /dev/null.)
713
# The exception is when not debugging but nevertheless
714
# running in the foreground; use the previously
717
if (not self.server_settings["debug"]
718
and self.server_settings["foreground"]):
719
popen_args.update({"stdout": wnull,
721
self.checker = subprocess.Popen(command,
725
except OSError as error:
726
logger.error("Failed to start subprocess",
729
self.checker_callback_tag = (gobject.child_watch_add
731
self.checker_callback,
733
# The checker may have completed before the gobject
734
# watch was added. Check for this.
736
pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
737
except OSError as error:
738
if error.errno == errno.ECHILD:
739
# This should never happen
740
logger.error("Child process vanished",
745
gobject.source_remove(self.checker_callback_tag)
746
self.checker_callback(pid, status, command)
216
command = self.check_command % self.fqdn
218
escaped_attrs = dict((key, re.escape(str(val)))
220
vars(self).iteritems())
222
command = self.check_command % escaped_attrs
223
except TypeError, error:
224
logger.critical(u'Could not format string "%s":'
225
u' %s', self.check_command, error)
226
return True # Try again later
228
logger.debug(u"Starting checker %r for %s",
230
self.checker = subprocess.\
232
close_fds=True, shell=True,
234
self.checker_callback_tag = gobject.child_watch_add\
236
self.checker_callback)
237
except subprocess.OSError, error:
238
logger.error(u"Failed to start subprocess: %s",
747
240
# Re-run this periodically if run by gobject.timeout_add
750
242
def stop_checker(self):
751
243
"""Force the checker process, if any, to stop."""
752
if self.checker_callback_tag:
753
gobject.source_remove(self.checker_callback_tag)
754
self.checker_callback_tag = None
755
if getattr(self, "checker", None) is None:
244
if not hasattr(self, "checker") or self.checker is None:
757
logger.debug("Stopping checker for %(name)s", vars(self))
759
self.checker.terminate()
761
#if self.checker.poll() is None:
762
# self.checker.kill()
763
except OSError as error:
764
if error.errno != errno.ESRCH: # No such process
769
def dbus_service_property(dbus_interface, signature="v",
770
access="readwrite", byte_arrays=False):
771
"""Decorators for marking methods of a DBusObjectWithProperties to
772
become properties on the D-Bus.
774
The decorated method will be called with no arguments by "Get"
775
and with one argument by "Set".
777
The parameters, where they are supported, are the same as
778
dbus.service.method, except there is only "signature", since the
779
type from Get() and the type sent to Set() is the same.
781
# Encoding deeply encoded byte arrays is not supported yet by the
782
# "Set" method, so we fail early here:
783
if byte_arrays and signature != "ay":
784
raise ValueError("Byte arrays not supported for non-'ay'"
785
" signature {!r}".format(signature))
787
func._dbus_is_property = True
788
func._dbus_interface = dbus_interface
789
func._dbus_signature = signature
790
func._dbus_access = access
791
func._dbus_name = func.__name__
792
if func._dbus_name.endswith("_dbus_property"):
793
func._dbus_name = func._dbus_name[:-14]
794
func._dbus_get_args_options = {'byte_arrays': byte_arrays }
799
def dbus_interface_annotations(dbus_interface):
800
"""Decorator for marking functions returning interface annotations
804
@dbus_interface_annotations("org.example.Interface")
805
def _foo(self): # Function name does not matter
806
return {"org.freedesktop.DBus.Deprecated": "true",
807
"org.freedesktop.DBus.Property.EmitsChangedSignal":
811
func._dbus_is_interface = True
812
func._dbus_interface = dbus_interface
813
func._dbus_name = dbus_interface
818
def dbus_annotations(annotations):
819
"""Decorator to annotate D-Bus methods, signals or properties
822
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",
823
"org.freedesktop.DBus.Property."
824
"EmitsChangedSignal": "false"})
825
@dbus_service_property("org.example.Interface", signature="b",
827
def Property_dbus_property(self):
828
return dbus.Boolean(False)
831
func._dbus_annotations = annotations
836
class DBusPropertyException(dbus.exceptions.DBusException):
837
"""A base class for D-Bus property-related exceptions
841
class DBusPropertyAccessException(DBusPropertyException):
842
"""A property's access permissions disallows an operation.
847
class DBusPropertyNotFound(DBusPropertyException):
848
"""An attempt was made to access a non-existing property.
853
class DBusObjectWithProperties(dbus.service.Object):
854
"""A D-Bus object with properties.
856
Classes inheriting from this can use the dbus_service_property
857
decorator to expose methods as D-Bus properties. It exposes the
858
standard Get(), Set(), and GetAll() methods on the D-Bus.
862
def _is_dbus_thing(thing):
863
"""Returns a function testing if an attribute is a D-Bus thing
865
If called like _is_dbus_thing("method") it returns a function
866
suitable for use as predicate to inspect.getmembers().
868
return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
871
def _get_all_dbus_things(self, thing):
872
"""Returns a generator of (name, attribute) pairs
874
return ((getattr(athing.__get__(self), "_dbus_name",
876
athing.__get__(self))
877
for cls in self.__class__.__mro__
879
inspect.getmembers(cls,
880
self._is_dbus_thing(thing)))
882
def _get_dbus_property(self, interface_name, property_name):
883
"""Returns a bound method if one exists which is a D-Bus
884
property with the specified name and interface.
886
for cls in self.__class__.__mro__:
887
for name, value in (inspect.getmembers
889
self._is_dbus_thing("property"))):
890
if (value._dbus_name == property_name
891
and value._dbus_interface == interface_name):
892
return value.__get__(self)
895
raise DBusPropertyNotFound(self.dbus_object_path + ":"
896
+ interface_name + "."
899
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ss",
901
def Get(self, interface_name, property_name):
902
"""Standard D-Bus property Get() method, see D-Bus standard.
904
prop = self._get_dbus_property(interface_name, property_name)
905
if prop._dbus_access == "write":
906
raise DBusPropertyAccessException(property_name)
908
if not hasattr(value, "variant_level"):
910
return type(value)(value, variant_level=value.variant_level+1)
912
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="ssv")
913
def Set(self, interface_name, property_name, value):
914
"""Standard D-Bus property Set() method, see D-Bus standard.
916
prop = self._get_dbus_property(interface_name, property_name)
917
if prop._dbus_access == "read":
918
raise DBusPropertyAccessException(property_name)
919
if prop._dbus_get_args_options["byte_arrays"]:
920
# The byte_arrays option is not supported yet on
921
# signatures other than "ay".
922
if prop._dbus_signature != "ay":
923
raise ValueError("Byte arrays not supported for non-"
924
"'ay' signature {!r}"
925
.format(prop._dbus_signature))
926
value = dbus.ByteArray(b''.join(chr(byte)
930
@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",
931
out_signature="a{sv}")
932
def GetAll(self, interface_name):
933
"""Standard D-Bus property GetAll() method, see D-Bus
936
Note: Will not include properties with access="write".
939
for name, prop in self._get_all_dbus_things("property"):
941
and interface_name != prop._dbus_interface):
942
# Interface non-empty but did not match
944
# Ignore write-only properties
945
if prop._dbus_access == "write":
948
if not hasattr(value, "variant_level"):
949
properties[name] = value
951
properties[name] = type(value)(value, variant_level=
952
value.variant_level+1)
953
return dbus.Dictionary(properties, signature="sv")
955
@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")
956
def PropertiesChanged(self, interface_name, changed_properties,
957
invalidated_properties):
958
"""Standard D-Bus PropertiesChanged() signal, see D-Bus
963
@dbus.service.method(dbus.INTROSPECTABLE_IFACE,
965
path_keyword='object_path',
966
connection_keyword='connection')
967
def Introspect(self, object_path, connection):
968
"""Overloading of standard D-Bus method.
970
Inserts property tags and interface annotation tags.
972
xmlstring = dbus.service.Object.Introspect(self, object_path,
975
document = xml.dom.minidom.parseString(xmlstring)
976
def make_tag(document, name, prop):
977
e = document.createElement("property")
978
e.setAttribute("name", name)
979
e.setAttribute("type", prop._dbus_signature)
980
e.setAttribute("access", prop._dbus_access)
982
for if_tag in document.getElementsByTagName("interface"):
984
for tag in (make_tag(document, name, prop)
986
in self._get_all_dbus_things("property")
987
if prop._dbus_interface
988
== if_tag.getAttribute("name")):
989
if_tag.appendChild(tag)
990
# Add annotation tags
991
for typ in ("method", "signal", "property"):
992
for tag in if_tag.getElementsByTagName(typ):
994
for name, prop in (self.
995
_get_all_dbus_things(typ)):
996
if (name == tag.getAttribute("name")
997
and prop._dbus_interface
998
== if_tag.getAttribute("name")):
999
annots.update(getattr
1001
"_dbus_annotations",
1003
for name, value in annots.items():
1004
ann_tag = document.createElement(
1006
ann_tag.setAttribute("name", name)
1007
ann_tag.setAttribute("value", value)
1008
tag.appendChild(ann_tag)
1009
# Add interface annotation tags
1010
for annotation, value in dict(
1011
itertools.chain.from_iterable(
1012
annotations().items()
1013
for name, annotations in
1014
self._get_all_dbus_things("interface")
1015
if name == if_tag.getAttribute("name")
1017
ann_tag = document.createElement("annotation")
1018
ann_tag.setAttribute("name", annotation)
1019
ann_tag.setAttribute("value", value)
1020
if_tag.appendChild(ann_tag)
1021
# Add the names to the return values for the
1022
# "org.freedesktop.DBus.Properties" methods
1023
if (if_tag.getAttribute("name")
1024
== "org.freedesktop.DBus.Properties"):
1025
for cn in if_tag.getElementsByTagName("method"):
1026
if cn.getAttribute("name") == "Get":
1027
for arg in cn.getElementsByTagName("arg"):
1028
if (arg.getAttribute("direction")
1030
arg.setAttribute("name", "value")
1031
elif cn.getAttribute("name") == "GetAll":
1032
for arg in cn.getElementsByTagName("arg"):
1033
if (arg.getAttribute("direction")
1035
arg.setAttribute("name", "props")
1036
xmlstring = document.toxml("utf-8")
1038
except (AttributeError, xml.dom.DOMException,
1039
xml.parsers.expat.ExpatError) as error:
1040
logger.error("Failed to override Introspection method",
1045
def datetime_to_dbus(dt, variant_level=0):
1046
"""Convert a UTC datetime.datetime() to a D-Bus type."""
1048
return dbus.String("", variant_level = variant_level)
1049
return dbus.String(dt.isoformat(),
1050
variant_level=variant_level)
1053
def alternate_dbus_interfaces(alt_interface_names, deprecate=True):
1054
"""A class decorator; applied to a subclass of
1055
dbus.service.Object, it will add alternate D-Bus attributes with
1056
interface names according to the "alt_interface_names" mapping.
1059
@alternate_dbus_interfaces({"org.example.Interface":
1060
"net.example.AlternateInterface"})
1061
class SampleDBusObject(dbus.service.Object):
1062
@dbus.service.method("org.example.Interface")
1063
def SampleDBusMethod():
1066
The above "SampleDBusMethod" on "SampleDBusObject" will be
1067
reachable via two interfaces: "org.example.Interface" and
1068
"net.example.AlternateInterface", the latter of which will have
1069
its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to
1070
"true", unless "deprecate" is passed with a False value.
1072
This works for methods and signals, and also for D-Bus properties
1073
(from DBusObjectWithProperties) and interfaces (from the
1074
dbus_interface_annotations decorator).
1077
for orig_interface_name, alt_interface_name in (
1078
alt_interface_names.items()):
1080
interface_names = set()
1081
# Go though all attributes of the class
1082
for attrname, attribute in inspect.getmembers(cls):
1083
# Ignore non-D-Bus attributes, and D-Bus attributes
1084
# with the wrong interface name
1085
if (not hasattr(attribute, "_dbus_interface")
1086
or not attribute._dbus_interface
1087
.startswith(orig_interface_name)):
1089
# Create an alternate D-Bus interface name based on
1091
alt_interface = (attribute._dbus_interface
1092
.replace(orig_interface_name,
1093
alt_interface_name))
1094
interface_names.add(alt_interface)
1095
# Is this a D-Bus signal?
1096
if getattr(attribute, "_dbus_is_signal", False):
1097
# Extract the original non-method undecorated
1098
# function by black magic
1099
nonmethod_func = (dict(
1100
zip(attribute.func_code.co_freevars,
1101
attribute.__closure__))["func"]
1103
# Create a new, but exactly alike, function
1104
# object, and decorate it to be a new D-Bus signal
1105
# with the alternate D-Bus interface name
1106
new_function = (dbus.service.signal
1108
attribute._dbus_signature)
1109
(types.FunctionType(
1110
nonmethod_func.func_code,
1111
nonmethod_func.func_globals,
1112
nonmethod_func.func_name,
1113
nonmethod_func.func_defaults,
1114
nonmethod_func.func_closure)))
1115
# Copy annotations, if any
1117
new_function._dbus_annotations = (
1118
dict(attribute._dbus_annotations))
1119
except AttributeError:
1121
# Define a creator of a function to call both the
1122
# original and alternate functions, so both the
1123
# original and alternate signals gets sent when
1124
# the function is called
1125
def fixscope(func1, func2):
1126
"""This function is a scope container to pass
1127
func1 and func2 to the "call_both" function
1128
outside of its arguments"""
1129
def call_both(*args, **kwargs):
1130
"""This function will emit two D-Bus
1131
signals by calling func1 and func2"""
1132
func1(*args, **kwargs)
1133
func2(*args, **kwargs)
1135
# Create the "call_both" function and add it to
1137
attr[attrname] = fixscope(attribute, new_function)
1138
# Is this a D-Bus method?
1139
elif getattr(attribute, "_dbus_is_method", False):
1140
# Create a new, but exactly alike, function
1141
# object. Decorate it to be a new D-Bus method
1142
# with the alternate D-Bus interface name. Add it
1144
attr[attrname] = (dbus.service.method
1146
attribute._dbus_in_signature,
1147
attribute._dbus_out_signature)
1149
(attribute.func_code,
1150
attribute.func_globals,
1151
attribute.func_name,
1152
attribute.func_defaults,
1153
attribute.func_closure)))
1154
# Copy annotations, if any
1156
attr[attrname]._dbus_annotations = (
1157
dict(attribute._dbus_annotations))
1158
except AttributeError:
1160
# Is this a D-Bus property?
1161
elif getattr(attribute, "_dbus_is_property", False):
1162
# Create a new, but exactly alike, function
1163
# object, and decorate it to be a new D-Bus
1164
# property with the alternate D-Bus interface
1165
# name. Add it to the class.
1166
attr[attrname] = (dbus_service_property
1168
attribute._dbus_signature,
1169
attribute._dbus_access,
1171
._dbus_get_args_options
1174
(attribute.func_code,
1175
attribute.func_globals,
1176
attribute.func_name,
1177
attribute.func_defaults,
1178
attribute.func_closure)))
1179
# Copy annotations, if any
1181
attr[attrname]._dbus_annotations = (
1182
dict(attribute._dbus_annotations))
1183
except AttributeError:
1185
# Is this a D-Bus interface?
1186
elif getattr(attribute, "_dbus_is_interface", False):
1187
# Create a new, but exactly alike, function
1188
# object. Decorate it to be a new D-Bus interface
1189
# with the alternate D-Bus interface name. Add it
1191
attr[attrname] = (dbus_interface_annotations
1194
(attribute.func_code,
1195
attribute.func_globals,
1196
attribute.func_name,
1197
attribute.func_defaults,
1198
attribute.func_closure)))
1200
# Deprecate all alternate interfaces
1201
iname="_AlternateDBusNames_interface_annotation{}"
1202
for interface_name in interface_names:
1203
@dbus_interface_annotations(interface_name)
1205
return { "org.freedesktop.DBus.Deprecated":
1207
# Find an unused name
1208
for aname in (iname.format(i)
1209
for i in itertools.count()):
1210
if aname not in attr:
1214
# Replace the class with a new subclass of it with
1215
# methods, signals, etc. as created above.
1216
cls = type(b"{}Alternate".format(cls.__name__),
1222
@alternate_dbus_interfaces({"se.recompile.Mandos":
1223
"se.bsnet.fukt.Mandos"})
1224
class ClientDBus(Client, DBusObjectWithProperties):
1225
"""A Client class using D-Bus
1228
dbus_object_path: dbus.ObjectPath
1229
bus: dbus.SystemBus()
1232
runtime_expansions = (Client.runtime_expansions
1233
+ ("dbus_object_path",))
1235
_interface = "se.recompile.Mandos.Client"
1237
# dbus.service.Object doesn't use super(), so we can't either.
1239
def __init__(self, bus = None, *args, **kwargs):
1241
Client.__init__(self, *args, **kwargs)
1242
# Only now, when this client is initialized, can it show up on
1244
client_object_name = str(self.name).translate(
1245
{ord("."): ord("_"),
1246
ord("-"): ord("_")})
1247
self.dbus_object_path = (dbus.ObjectPath
1248
("/clients/" + client_object_name))
1249
DBusObjectWithProperties.__init__(self, self.bus,
1250
self.dbus_object_path)
1252
def notifychangeproperty(transform_func,
1253
dbus_name, type_func=lambda x: x,
1254
variant_level=1, invalidate_only=False,
1255
_interface=_interface):
1256
""" Modify a variable so that it's a property which announces
1257
its changes to DBus.
1259
transform_fun: Function that takes a value and a variant_level
1260
and transforms it to a D-Bus type.
1261
dbus_name: D-Bus name of the variable
1262
type_func: Function that transform the value before sending it
1263
to the D-Bus. Default: no transform
1264
variant_level: D-Bus variant level. Default: 1
1266
attrname = "_{}".format(dbus_name)
1267
def setter(self, value):
1268
if hasattr(self, "dbus_object_path"):
1269
if (not hasattr(self, attrname) or
1270
type_func(getattr(self, attrname, None))
1271
!= type_func(value)):
1273
self.PropertiesChanged(_interface,
1278
dbus_value = transform_func(type_func(value),
1281
self.PropertyChanged(dbus.String(dbus_name),
1283
self.PropertiesChanged(_interface,
1285
dbus.String(dbus_name):
1286
dbus_value }), dbus.Array())
1287
setattr(self, attrname, value)
1289
return property(lambda self: getattr(self, attrname), setter)
1291
expires = notifychangeproperty(datetime_to_dbus, "Expires")
1292
approvals_pending = notifychangeproperty(dbus.Boolean,
1295
enabled = notifychangeproperty(dbus.Boolean, "Enabled")
1296
last_enabled = notifychangeproperty(datetime_to_dbus,
1298
checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",
1299
type_func = lambda checker:
1300
checker is not None)
1301
last_checked_ok = notifychangeproperty(datetime_to_dbus,
1303
last_checker_status = notifychangeproperty(dbus.Int16,
1304
"LastCheckerStatus")
1305
last_approval_request = notifychangeproperty(
1306
datetime_to_dbus, "LastApprovalRequest")
1307
approved_by_default = notifychangeproperty(dbus.Boolean,
1308
"ApprovedByDefault")
1309
approval_delay = notifychangeproperty(dbus.UInt64,
1312
lambda td: td.total_seconds()
1314
approval_duration = notifychangeproperty(
1315
dbus.UInt64, "ApprovalDuration",
1316
type_func = lambda td: td.total_seconds() * 1000)
1317
host = notifychangeproperty(dbus.String, "Host")
1318
timeout = notifychangeproperty(dbus.UInt64, "Timeout",
1319
type_func = lambda td:
1320
td.total_seconds() * 1000)
1321
extended_timeout = notifychangeproperty(
1322
dbus.UInt64, "ExtendedTimeout",
1323
type_func = lambda td: td.total_seconds() * 1000)
1324
interval = notifychangeproperty(dbus.UInt64,
1327
lambda td: td.total_seconds()
1329
checker_command = notifychangeproperty(dbus.String, "Checker")
1330
secret = notifychangeproperty(dbus.ByteArray, "Secret",
1331
invalidate_only=True)
1333
del notifychangeproperty
1335
def __del__(self, *args, **kwargs):
1337
self.remove_from_connection()
1340
if hasattr(DBusObjectWithProperties, "__del__"):
1341
DBusObjectWithProperties.__del__(self, *args, **kwargs)
1342
Client.__del__(self, *args, **kwargs)
1344
def checker_callback(self, pid, condition, command,
246
gobject.source_remove(self.checker_callback_tag)
1346
247
self.checker_callback_tag = None
248
os.kill(self.checker.pid, signal.SIGTERM)
249
if self.checker.poll() is None:
250
os.kill(self.checker.pid, signal.SIGKILL)
1347
251
self.checker = None
1348
if os.WIFEXITED(condition):
1349
exitstatus = os.WEXITSTATUS(condition)
1351
self.CheckerCompleted(dbus.Int16(exitstatus),
1352
dbus.Int64(condition),
1353
dbus.String(command))
1356
self.CheckerCompleted(dbus.Int16(-1),
1357
dbus.Int64(condition),
1358
dbus.String(command))
1360
return Client.checker_callback(self, pid, condition, command,
1363
def start_checker(self, *args, **kwargs):
1364
old_checker_pid = getattr(self.checker, "pid", None)
1365
r = Client.start_checker(self, *args, **kwargs)
1366
# Only if new checker process was started
1367
if (self.checker is not None
1368
and old_checker_pid != self.checker.pid):
1370
self.CheckerStarted(self.current_checker_command)
1373
def _reset_approved(self):
1374
self.approved = None
1377
def approve(self, value=True):
1378
self.approved = value
1379
gobject.timeout_add(int(self.approval_duration.total_seconds()
1380
* 1000), self._reset_approved)
1381
self.send_changedstate()
1383
## D-Bus methods, signals & properties
1389
# CheckerCompleted - signal
1390
@dbus.service.signal(_interface, signature="nxs")
1391
def CheckerCompleted(self, exitcode, waitstatus, command):
1395
# CheckerStarted - signal
1396
@dbus.service.signal(_interface, signature="s")
1397
def CheckerStarted(self, command):
1401
# PropertyChanged - signal
1402
@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})
1403
@dbus.service.signal(_interface, signature="sv")
1404
def PropertyChanged(self, property, value):
1408
# GotSecret - signal
1409
@dbus.service.signal(_interface)
1410
def GotSecret(self):
1412
Is sent after a successful transfer of secret from the Mandos
1413
server to mandos-client
1418
@dbus.service.signal(_interface, signature="s")
1419
def Rejected(self, reason):
1423
# NeedApproval - signal
1424
@dbus.service.signal(_interface, signature="tb")
1425
def NeedApproval(self, timeout, default):
1427
return self.need_approval()
1432
@dbus.service.method(_interface, in_signature="b")
1433
def Approve(self, value):
1436
# CheckedOK - method
1437
@dbus.service.method(_interface)
1438
def CheckedOK(self):
1442
@dbus.service.method(_interface)
1447
# StartChecker - method
1448
@dbus.service.method(_interface)
1449
def StartChecker(self):
1451
self.start_checker()
1454
@dbus.service.method(_interface)
1459
# StopChecker - method
1460
@dbus.service.method(_interface)
1461
def StopChecker(self):
1466
# ApprovalPending - property
1467
@dbus_service_property(_interface, signature="b", access="read")
1468
def ApprovalPending_dbus_property(self):
1469
return dbus.Boolean(bool(self.approvals_pending))
1471
# ApprovedByDefault - property
1472
@dbus_service_property(_interface, signature="b",
1474
def ApprovedByDefault_dbus_property(self, value=None):
1475
if value is None: # get
1476
return dbus.Boolean(self.approved_by_default)
1477
self.approved_by_default = bool(value)
1479
# ApprovalDelay - property
1480
@dbus_service_property(_interface, signature="t",
1482
def ApprovalDelay_dbus_property(self, value=None):
1483
if value is None: # get
1484
return dbus.UInt64(self.approval_delay.total_seconds()
1486
self.approval_delay = datetime.timedelta(0, 0, 0, value)
1488
# ApprovalDuration - property
1489
@dbus_service_property(_interface, signature="t",
1491
def ApprovalDuration_dbus_property(self, value=None):
1492
if value is None: # get
1493
return dbus.UInt64(self.approval_duration.total_seconds()
1495
self.approval_duration = datetime.timedelta(0, 0, 0, value)
1498
@dbus_service_property(_interface, signature="s", access="read")
1499
def Name_dbus_property(self):
1500
return dbus.String(self.name)
1502
# Fingerprint - property
1503
@dbus_service_property(_interface, signature="s", access="read")
1504
def Fingerprint_dbus_property(self):
1505
return dbus.String(self.fingerprint)
1508
@dbus_service_property(_interface, signature="s",
1510
def Host_dbus_property(self, value=None):
1511
if value is None: # get
1512
return dbus.String(self.host)
1513
self.host = str(value)
1515
# Created - property
1516
@dbus_service_property(_interface, signature="s", access="read")
1517
def Created_dbus_property(self):
1518
return datetime_to_dbus(self.created)
1520
# LastEnabled - property
1521
@dbus_service_property(_interface, signature="s", access="read")
1522
def LastEnabled_dbus_property(self):
1523
return datetime_to_dbus(self.last_enabled)
1525
# Enabled - property
1526
@dbus_service_property(_interface, signature="b",
1528
def Enabled_dbus_property(self, value=None):
1529
if value is None: # get
1530
return dbus.Boolean(self.enabled)
1536
# LastCheckedOK - property
1537
@dbus_service_property(_interface, signature="s",
1539
def LastCheckedOK_dbus_property(self, value=None):
1540
if value is not None:
1543
return datetime_to_dbus(self.last_checked_ok)
1545
# LastCheckerStatus - property
1546
@dbus_service_property(_interface, signature="n",
1548
def LastCheckerStatus_dbus_property(self):
1549
return dbus.Int16(self.last_checker_status)
1551
# Expires - property
1552
@dbus_service_property(_interface, signature="s", access="read")
1553
def Expires_dbus_property(self):
1554
return datetime_to_dbus(self.expires)
1556
# LastApprovalRequest - property
1557
@dbus_service_property(_interface, signature="s", access="read")
1558
def LastApprovalRequest_dbus_property(self):
1559
return datetime_to_dbus(self.last_approval_request)
1561
# Timeout - property
1562
@dbus_service_property(_interface, signature="t",
1564
def Timeout_dbus_property(self, value=None):
1565
if value is None: # get
1566
return dbus.UInt64(self.timeout.total_seconds() * 1000)
1567
old_timeout = self.timeout
1568
self.timeout = datetime.timedelta(0, 0, 0, value)
1569
# Reschedule disabling
1571
now = datetime.datetime.utcnow()
1572
self.expires += self.timeout - old_timeout
1573
if self.expires <= now:
1574
# The timeout has passed
1577
if (getattr(self, "disable_initiator_tag", None)
1580
gobject.source_remove(self.disable_initiator_tag)
1581
self.disable_initiator_tag = (
1582
gobject.timeout_add(
1583
int((self.expires - now).total_seconds()
1584
* 1000), self.disable))
1586
# ExtendedTimeout - property
1587
@dbus_service_property(_interface, signature="t",
1589
def ExtendedTimeout_dbus_property(self, value=None):
1590
if value is None: # get
1591
return dbus.UInt64(self.extended_timeout.total_seconds()
1593
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1595
# Interval - property
1596
@dbus_service_property(_interface, signature="t",
1598
def Interval_dbus_property(self, value=None):
1599
if value is None: # get
1600
return dbus.UInt64(self.interval.total_seconds() * 1000)
1601
self.interval = datetime.timedelta(0, 0, 0, value)
1602
if getattr(self, "checker_initiator_tag", None) is None:
1605
# Reschedule checker run
1606
gobject.source_remove(self.checker_initiator_tag)
1607
self.checker_initiator_tag = (gobject.timeout_add
1608
(value, self.start_checker))
1609
self.start_checker() # Start one now, too
1611
# Checker - property
1612
@dbus_service_property(_interface, signature="s",
1614
def Checker_dbus_property(self, value=None):
1615
if value is None: # get
1616
return dbus.String(self.checker_command)
1617
self.checker_command = str(value)
1619
# CheckerRunning - property
1620
@dbus_service_property(_interface, signature="b",
1622
def CheckerRunning_dbus_property(self, value=None):
1623
if value is None: # get
1624
return dbus.Boolean(self.checker is not None)
1626
self.start_checker()
1630
# ObjectPath - property
1631
@dbus_service_property(_interface, signature="o", access="read")
1632
def ObjectPath_dbus_property(self):
1633
return self.dbus_object_path # is already a dbus.ObjectPath
1636
@dbus_service_property(_interface, signature="ay",
1637
access="write", byte_arrays=True)
1638
def Secret_dbus_property(self, value):
1639
self.secret = bytes(value)
1644
class ProxyClient(object):
1645
def __init__(self, child_pipe, fpr, address):
1646
self._pipe = child_pipe
1647
self._pipe.send(('init', fpr, address))
1648
if not self._pipe.recv():
1651
def __getattribute__(self, name):
1653
return super(ProxyClient, self).__getattribute__(name)
1654
self._pipe.send(('getattr', name))
1655
data = self._pipe.recv()
1656
if data[0] == 'data':
1658
if data[0] == 'function':
1659
def func(*args, **kwargs):
1660
self._pipe.send(('funcall', name, args, kwargs))
1661
return self._pipe.recv()[1]
1664
def __setattr__(self, name, value):
1666
return super(ProxyClient, self).__setattr__(name, value)
1667
self._pipe.send(('setattr', name, value))
1670
class ClientHandler(socketserver.BaseRequestHandler, object):
1671
"""A class to handle client connections.
1673
Instantiated once for each connection to handle it.
252
def still_valid(self, now=None):
253
"""Has the timeout not yet passed for this client?"""
255
now = datetime.datetime.now()
256
if self.last_seen is None:
257
return now < (self.created + self.timeout)
259
return now < (self.last_seen + self.timeout)
262
def peer_certificate(session):
263
"Return an OpenPGP data packet string for the peer's certificate"
264
# If not an OpenPGP certificate...
265
if gnutls.library.functions.gnutls_certificate_type_get\
266
(session._c_object) \
267
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP:
268
# ...do the normal thing
269
return session.peer_certificate
270
list_size = ctypes.c_uint()
271
cert_list = gnutls.library.functions.gnutls_certificate_get_peers\
272
(session._c_object, ctypes.byref(list_size))
273
if list_size.value == 0:
276
return ctypes.string_at(cert.data, cert.size)
279
def fingerprint(openpgp):
280
"Convert an OpenPGP data string to a hexdigit fingerprint string"
281
# New empty GnuTLS certificate
282
crt = gnutls.library.types.gnutls_openpgp_crt_t()
283
gnutls.library.functions.gnutls_openpgp_crt_init\
285
# New GnuTLS "datum" with the OpenPGP public key
286
datum = gnutls.library.types.gnutls_datum_t\
287
(ctypes.cast(ctypes.c_char_p(openpgp),
288
ctypes.POINTER(ctypes.c_ubyte)),
289
ctypes.c_uint(len(openpgp)))
290
# Import the OpenPGP public key into the certificate
291
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
294
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
295
# New buffer for the fingerprint
296
buffer = ctypes.create_string_buffer(20)
297
buffer_length = ctypes.c_size_t()
298
# Get the fingerprint from the certificate into the buffer
299
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
300
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
301
# Deinit the certificate
302
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
303
# Convert the buffer to a Python bytestring
304
fpr = ctypes.string_at(buffer, buffer_length.value)
305
# Convert the bytestring to hexadecimal notation
306
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
310
class tcp_handler(SocketServer.BaseRequestHandler, object):
311
"""A TCP request handler class.
312
Instantiated by IPv6_TCPServer for each request to handle it.
1674
313
Note: This will run in its own forked process."""
1676
315
def handle(self):
1677
with contextlib.closing(self.server.child_pipe) as child_pipe:
1678
logger.info("TCP connection from: %s",
1679
str(self.client_address))
1680
logger.debug("Pipe FD: %d",
1681
self.server.child_pipe.fileno())
1683
session = (gnutls.connection
1684
.ClientSession(self.request,
1686
.X509Credentials()))
1688
# Note: gnutls.connection.X509Credentials is really a
1689
# generic GnuTLS certificate credentials object so long as
1690
# no X.509 keys are added to it. Therefore, we can use it
1691
# here despite using OpenPGP certificates.
1693
#priority = ':'.join(("NONE", "+VERS-TLS1.1",
1694
# "+AES-256-CBC", "+SHA1",
1695
# "+COMP-NULL", "+CTYPE-OPENPGP",
1697
# Use a fallback default, since this MUST be set.
1698
priority = self.server.gnutls_priority
1699
if priority is None:
1701
(gnutls.library.functions
1702
.gnutls_priority_set_direct(session._c_object,
1705
# Start communication using the Mandos protocol
1706
# Get protocol number
1707
line = self.request.makefile().readline()
1708
logger.debug("Protocol version: %r", line)
1710
if int(line.strip().split()[0]) > 1:
1711
raise RuntimeError(line)
1712
except (ValueError, IndexError, RuntimeError) as error:
1713
logger.error("Unknown protocol version: %s", error)
1716
# Start GnuTLS connection
1719
except gnutls.errors.GNUTLSError as error:
1720
logger.warning("Handshake failed: %s", error)
1721
# Do not run session.bye() here: the session is not
1722
# established. Just abandon the request.
1724
logger.debug("Handshake succeeded")
1726
approval_required = False
1729
fpr = self.fingerprint(self.peer_certificate
1732
gnutls.errors.GNUTLSError) as error:
1733
logger.warning("Bad certificate: %s", error)
1735
logger.debug("Fingerprint: %s", fpr)
1738
client = ProxyClient(child_pipe, fpr,
1739
self.client_address)
1743
if client.approval_delay:
1744
delay = client.approval_delay
1745
client.approvals_pending += 1
1746
approval_required = True
1749
if not client.enabled:
1750
logger.info("Client %s is disabled",
1752
if self.server.use_dbus:
1754
client.Rejected("Disabled")
1757
if client.approved or not client.approval_delay:
1758
#We are approved or approval is disabled
1760
elif client.approved is None:
1761
logger.info("Client %s needs approval",
1763
if self.server.use_dbus:
1765
client.NeedApproval(
1766
client.approval_delay.total_seconds()
1767
* 1000, client.approved_by_default)
1769
logger.warning("Client %s was not approved",
1771
if self.server.use_dbus:
1773
client.Rejected("Denied")
1776
#wait until timeout or approved
1777
time = datetime.datetime.now()
1778
client.changedstate.acquire()
1779
client.changedstate.wait(delay.total_seconds())
1780
client.changedstate.release()
1781
time2 = datetime.datetime.now()
1782
if (time2 - time) >= delay:
1783
if not client.approved_by_default:
1784
logger.warning("Client %s timed out while"
1785
" waiting for approval",
1787
if self.server.use_dbus:
1789
client.Rejected("Approval timed out")
1794
delay -= time2 - time
1797
while sent_size < len(client.secret):
1799
sent = session.send(client.secret[sent_size:])
1800
except gnutls.errors.GNUTLSError as error:
1801
logger.warning("gnutls send failed",
1804
logger.debug("Sent: %d, remaining: %d",
1805
sent, len(client.secret)
1806
- (sent_size + sent))
1809
logger.info("Sending secret to %s", client.name)
1810
# bump the timeout using extended_timeout
1811
client.bump_timeout(client.extended_timeout)
1812
if self.server.use_dbus:
1817
if approval_required:
1818
client.approvals_pending -= 1
1821
except gnutls.errors.GNUTLSError as error:
1822
logger.warning("GnuTLS bye failed",
1826
def peer_certificate(session):
1827
"Return the peer's OpenPGP certificate as a bytestring"
1828
# If not an OpenPGP certificate...
1829
if (gnutls.library.functions
1830
.gnutls_certificate_type_get(session._c_object)
1831
!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):
1832
# ...do the normal thing
1833
return session.peer_certificate
1834
list_size = ctypes.c_uint(1)
1835
cert_list = (gnutls.library.functions
1836
.gnutls_certificate_get_peers
1837
(session._c_object, ctypes.byref(list_size)))
1838
if not bool(cert_list) and list_size.value != 0:
1839
raise gnutls.errors.GNUTLSError("error getting peer"
1841
if list_size.value == 0:
1844
return ctypes.string_at(cert.data, cert.size)
1847
def fingerprint(openpgp):
1848
"Convert an OpenPGP bytestring to a hexdigit fingerprint"
1849
# New GnuTLS "datum" with the OpenPGP public key
1850
datum = (gnutls.library.types
1851
.gnutls_datum_t(ctypes.cast(ctypes.c_char_p(openpgp),
1854
ctypes.c_uint(len(openpgp))))
1855
# New empty GnuTLS certificate
1856
crt = gnutls.library.types.gnutls_openpgp_crt_t()
1857
(gnutls.library.functions
1858
.gnutls_openpgp_crt_init(ctypes.byref(crt)))
1859
# Import the OpenPGP public key into the certificate
1860
(gnutls.library.functions
1861
.gnutls_openpgp_crt_import(crt, ctypes.byref(datum),
1862
gnutls.library.constants
1863
.GNUTLS_OPENPGP_FMT_RAW))
1864
# Verify the self signature in the key
1865
crtverify = ctypes.c_uint()
1866
(gnutls.library.functions
1867
.gnutls_openpgp_crt_verify_self(crt, 0,
1868
ctypes.byref(crtverify)))
1869
if crtverify.value != 0:
1870
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1871
raise (gnutls.errors.CertificateSecurityError
1873
# New buffer for the fingerprint
1874
buf = ctypes.create_string_buffer(20)
1875
buf_len = ctypes.c_size_t()
1876
# Get the fingerprint from the certificate into the buffer
1877
(gnutls.library.functions
1878
.gnutls_openpgp_crt_get_fingerprint(crt, ctypes.byref(buf),
1879
ctypes.byref(buf_len)))
1880
# Deinit the certificate
1881
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
1882
# Convert the buffer to a Python bytestring
1883
fpr = ctypes.string_at(buf, buf_len.value)
1884
# Convert the bytestring to hexadecimal notation
1885
hex_fpr = binascii.hexlify(fpr).upper()
1889
class MultiprocessingMixIn(object):
1890
"""Like socketserver.ThreadingMixIn, but with multiprocessing"""
1891
def sub_process_main(self, request, address):
1893
self.finish_request(request, address)
1895
self.handle_error(request, address)
1896
self.close_request(request)
1898
def process_request(self, request, address):
1899
"""Start a new process to process the request."""
1900
proc = multiprocessing.Process(target = self.sub_process_main,
1901
args = (request, address))
1906
class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):
1907
""" adds a pipe to the MixIn """
1908
def process_request(self, request, client_address):
1909
"""Overrides and wraps the original process_request().
1911
This function creates a new pipe in self.pipe
1913
parent_pipe, self.child_pipe = multiprocessing.Pipe()
1915
proc = MultiprocessingMixIn.process_request(self, request,
1917
self.child_pipe.close()
1918
self.add_pipe(parent_pipe, proc)
1920
def add_pipe(self, parent_pipe, proc):
1921
"""Dummy function; override as necessary"""
1922
raise NotImplementedError()
1925
class IPv6_TCPServer(MultiprocessingMixInWithPipe,
1926
socketserver.TCPServer, object):
1927
"""IPv6-capable TCP server. Accepts 'None' as address and/or port
316
logger.debug(u"TCP connection from: %s",
317
unicode(self.client_address))
318
session = gnutls.connection.ClientSession(self.request,
322
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
323
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
325
priority = "SECURE256"
327
gnutls.library.functions.gnutls_priority_set_direct\
328
(session._c_object, priority, None);
332
except gnutls.errors.GNUTLSError, error:
333
logger.debug(u"Handshake failed: %s", error)
334
# Do not run session.bye() here: the session is not
335
# established. Just abandon the request.
338
fpr = fingerprint(peer_certificate(session))
339
except (TypeError, gnutls.errors.GNUTLSError), error:
340
logger.debug(u"Bad certificate: %s", error)
343
logger.debug(u"Fingerprint: %s", fpr)
346
if c.fingerprint == fpr:
349
# Have to check if client.still_valid(), since it is possible
350
# that the client timed out while establishing the GnuTLS
352
if (not client) or (not client.still_valid()):
354
logger.debug(u"Client %(name)s is invalid",
357
logger.debug(u"Client not found for fingerprint: %s",
362
while sent_size < len(client.secret):
363
sent = session.send(client.secret[sent_size:])
364
logger.debug(u"Sent: %d, remaining: %d",
365
sent, len(client.secret)
366
- (sent_size + sent))
371
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
372
"""IPv6 TCP server. Accepts 'None' as address and/or port.
1930
enabled: Boolean; whether this server is activated yet
1931
interface: None or a network interface name (string)
1932
use_ipv6: Boolean; to use IPv6 or not
374
options: Command line options
375
clients: Set() of Client objects
1934
def __init__(self, server_address, RequestHandlerClass,
1935
interface=None, use_ipv6=True, socketfd=None):
1936
"""If socketfd is set, use that file descriptor instead of
1937
creating a new one with socket.socket().
1939
self.interface = interface
1941
self.address_family = socket.AF_INET6
1942
if socketfd is not None:
1943
# Save the file descriptor
1944
self.socketfd = socketfd
1945
# Save the original socket.socket() function
1946
self.socket_socket = socket.socket
1947
# To implement --socket, we monkey patch socket.socket.
1949
# (When socketserver.TCPServer is a new-style class, we
1950
# could make self.socket into a property instead of monkey
1951
# patching socket.socket.)
1953
# Create a one-time-only replacement for socket.socket()
1954
@functools.wraps(socket.socket)
1955
def socket_wrapper(*args, **kwargs):
1956
# Restore original function so subsequent calls are
1958
socket.socket = self.socket_socket
1959
del self.socket_socket
1960
# This time only, return a new socket object from the
1961
# saved file descriptor.
1962
return socket.fromfd(self.socketfd, *args, **kwargs)
1963
# Replace socket.socket() function with wrapper
1964
socket.socket = socket_wrapper
1965
# The socketserver.TCPServer.__init__ will call
1966
# socket.socket(), which might be our replacement,
1967
# socket_wrapper(), if socketfd was set.
1968
socketserver.TCPServer.__init__(self, server_address,
1969
RequestHandlerClass)
377
address_family = socket.AF_INET6
378
def __init__(self, *args, **kwargs):
379
if "options" in kwargs:
380
self.options = kwargs["options"]
381
del kwargs["options"]
382
if "clients" in kwargs:
383
self.clients = kwargs["clients"]
384
del kwargs["clients"]
385
return super(type(self), self).__init__(*args, **kwargs)
1971
386
def server_bind(self):
1972
387
"""This overrides the normal server_bind() function
1973
388
to bind to an interface if one was specified, and also NOT to
1974
389
bind to an address or port if they were not specified."""
1975
if self.interface is not None:
1976
if SO_BINDTODEVICE is None:
1977
logger.error("SO_BINDTODEVICE does not exist;"
1978
" cannot bind to interface %s",
1982
self.socket.setsockopt(socket.SOL_SOCKET,
1984
(self.interface + "\0")
1986
except socket.error as error:
1987
if error.errno == errno.EPERM:
1988
logger.error("No permission to bind to"
1989
" interface %s", self.interface)
1990
elif error.errno == errno.ENOPROTOOPT:
1991
logger.error("SO_BINDTODEVICE not available;"
1992
" cannot bind to interface %s",
1994
elif error.errno == errno.ENODEV:
1995
logger.error("Interface %s does not exist,"
1996
" cannot bind", self.interface)
390
if self.options.interface:
391
if not hasattr(socket, "SO_BINDTODEVICE"):
392
# From /usr/include/asm-i486/socket.h
393
socket.SO_BINDTODEVICE = 25
395
self.socket.setsockopt(socket.SOL_SOCKET,
396
socket.SO_BINDTODEVICE,
397
self.options.interface)
398
except socket.error, error:
399
if error[0] == errno.EPERM:
400
logger.warning(u"No permission to"
401
u" bind to interface %s",
402
self.options.interface)
1999
405
# Only bind(2) the socket if we really need to.
2000
406
if self.server_address[0] or self.server_address[1]:
2001
407
if not self.server_address[0]:
2002
if self.address_family == socket.AF_INET6:
2003
any_address = "::" # in6addr_any
2005
any_address = "0.0.0.0" # INADDR_ANY
2006
self.server_address = (any_address,
409
self.server_address = (in6addr_any,
2007
410
self.server_address[1])
2008
elif not self.server_address[1]:
411
elif self.server_address[1] is None:
2009
412
self.server_address = (self.server_address[0],
2011
# if self.interface:
2012
# self.server_address = (self.server_address[0],
2017
return socketserver.TCPServer.server_bind(self)
2020
class MandosServer(IPv6_TCPServer):
2024
clients: set of Client objects
2025
gnutls_priority GnuTLS priority string
2026
use_dbus: Boolean; to emit D-Bus signals or not
2028
Assumes a gobject.MainLoop event loop.
2030
def __init__(self, server_address, RequestHandlerClass,
2031
interface=None, use_ipv6=True, clients=None,
2032
gnutls_priority=None, use_dbus=True, socketfd=None):
2033
self.enabled = False
2034
self.clients = clients
2035
if self.clients is None:
2037
self.use_dbus = use_dbus
2038
self.gnutls_priority = gnutls_priority
2039
IPv6_TCPServer.__init__(self, server_address,
2040
RequestHandlerClass,
2041
interface = interface,
2042
use_ipv6 = use_ipv6,
2043
socketfd = socketfd)
2044
def server_activate(self):
2046
return socketserver.TCPServer.server_activate(self)
2051
def add_pipe(self, parent_pipe, proc):
2052
# Call "handle_ipc" for both data and EOF events
2053
gobject.io_add_watch(parent_pipe.fileno(),
2054
gobject.IO_IN | gobject.IO_HUP,
2055
functools.partial(self.handle_ipc,
2060
def handle_ipc(self, source, condition, parent_pipe=None,
2061
proc = None, client_object=None):
2062
# error, or the other end of multiprocessing.Pipe has closed
2063
if condition & (gobject.IO_ERR | gobject.IO_HUP):
2064
# Wait for other process to exit
2068
# Read a request from the child
2069
request = parent_pipe.recv()
2070
command = request[0]
2072
if command == 'init':
2074
address = request[2]
2076
for c in self.clients.itervalues():
2077
if c.fingerprint == fpr:
2081
logger.info("Client not found for fingerprint: %s, ad"
2082
"dress: %s", fpr, address)
2085
mandos_dbus_service.ClientNotFound(fpr,
2087
parent_pipe.send(False)
2090
gobject.io_add_watch(parent_pipe.fileno(),
2091
gobject.IO_IN | gobject.IO_HUP,
2092
functools.partial(self.handle_ipc,
2098
parent_pipe.send(True)
2099
# remove the old hook in favor of the new above hook on
2102
if command == 'funcall':
2103
funcname = request[1]
2107
parent_pipe.send(('data', getattr(client_object,
2111
if command == 'getattr':
2112
attrname = request[1]
2113
if callable(client_object.__getattribute__(attrname)):
2114
parent_pipe.send(('function',))
2116
parent_pipe.send(('data', client_object
2117
.__getattribute__(attrname)))
2119
if command == 'setattr':
2120
attrname = request[1]
2122
setattr(client_object, attrname, value)
2127
def rfc3339_duration_to_delta(duration):
2128
"""Parse an RFC 3339 "duration" and return a datetime.timedelta
2130
>>> rfc3339_duration_to_delta("P7D")
2131
datetime.timedelta(7)
2132
>>> rfc3339_duration_to_delta("PT60S")
2133
datetime.timedelta(0, 60)
2134
>>> rfc3339_duration_to_delta("PT60M")
2135
datetime.timedelta(0, 3600)
2136
>>> rfc3339_duration_to_delta("PT24H")
2137
datetime.timedelta(1)
2138
>>> rfc3339_duration_to_delta("P1W")
2139
datetime.timedelta(7)
2140
>>> rfc3339_duration_to_delta("PT5M30S")
2141
datetime.timedelta(0, 330)
2142
>>> rfc3339_duration_to_delta("P1DT3M20S")
2143
datetime.timedelta(1, 200)
2146
# Parsing an RFC 3339 duration with regular expressions is not
2147
# possible - there would have to be multiple places for the same
2148
# values, like seconds. The current code, while more esoteric, is
2149
# cleaner without depending on a parsing library. If Python had a
2150
# built-in library for parsing we would use it, but we'd like to
2151
# avoid excessive use of external libraries.
2153
# New type for defining tokens, syntax, and semantics all-in-one
2154
Token = collections.namedtuple("Token",
2155
("regexp", # To match token; if
2156
# "value" is not None,
2157
# must have a "group"
2159
"value", # datetime.timedelta or
2161
"followers")) # Tokens valid after
2163
# RFC 3339 "duration" tokens, syntax, and semantics; taken from
2164
# the "duration" ABNF definition in RFC 3339, Appendix A.
2165
token_end = Token(re.compile(r"$"), None, frozenset())
2166
token_second = Token(re.compile(r"(\d+)S"),
2167
datetime.timedelta(seconds=1),
2168
frozenset((token_end,)))
2169
token_minute = Token(re.compile(r"(\d+)M"),
2170
datetime.timedelta(minutes=1),
2171
frozenset((token_second, token_end)))
2172
token_hour = Token(re.compile(r"(\d+)H"),
2173
datetime.timedelta(hours=1),
2174
frozenset((token_minute, token_end)))
2175
token_time = Token(re.compile(r"T"),
2177
frozenset((token_hour, token_minute,
2179
token_day = Token(re.compile(r"(\d+)D"),
2180
datetime.timedelta(days=1),
2181
frozenset((token_time, token_end)))
2182
token_month = Token(re.compile(r"(\d+)M"),
2183
datetime.timedelta(weeks=4),
2184
frozenset((token_day, token_end)))
2185
token_year = Token(re.compile(r"(\d+)Y"),
2186
datetime.timedelta(weeks=52),
2187
frozenset((token_month, token_end)))
2188
token_week = Token(re.compile(r"(\d+)W"),
2189
datetime.timedelta(weeks=1),
2190
frozenset((token_end,)))
2191
token_duration = Token(re.compile(r"P"), None,
2192
frozenset((token_year, token_month,
2193
token_day, token_time,
2195
# Define starting values
2196
value = datetime.timedelta() # Value so far
2198
followers = frozenset((token_duration,)) # Following valid tokens
2199
s = duration # String left to parse
2200
# Loop until end token is found
2201
while found_token is not token_end:
2202
# Search for any currently valid tokens
2203
for token in followers:
2204
match = token.regexp.match(s)
2205
if match is not None:
2207
if token.value is not None:
2208
# Value found, parse digits
2209
factor = int(match.group(1), 10)
2210
# Add to value so far
2211
value += factor * token.value
2212
# Strip token from string
2213
s = token.regexp.sub("", s, 1)
2216
# Set valid next tokens
2217
followers = found_token.followers
2220
# No currently valid tokens were found
2221
raise ValueError("Invalid RFC 3339 duration")
414
return super(type(self), self).server_bind()
2226
417
def string_to_delta(interval):
2227
418
"""Parse a string and return a datetime.timedelta
2229
420
>>> string_to_delta('7d')
2230
421
datetime.timedelta(7)
2231
422
>>> string_to_delta('60s')
2298
##################################################################
2299
# Parsing of options, both command line and config file
2301
parser = argparse.ArgumentParser()
2302
parser.add_argument("-v", "--version", action="version",
2303
version = "%(prog)s {}".format(version),
2304
help="show version number and exit")
2305
parser.add_argument("-i", "--interface", metavar="IF",
2306
help="Bind to interface IF")
2307
parser.add_argument("-a", "--address",
2308
help="Address to listen for requests on")
2309
parser.add_argument("-p", "--port", type=int,
2310
help="Port number to receive requests on")
2311
parser.add_argument("--check", action="store_true",
2312
help="Run self-test")
2313
parser.add_argument("--debug", action="store_true",
2314
help="Debug mode; run in foreground and log"
2315
" to terminal", default=None)
2316
parser.add_argument("--debuglevel", metavar="LEVEL",
2317
help="Debug level for stdout output")
2318
parser.add_argument("--priority", help="GnuTLS"
2319
" priority string (see GnuTLS documentation)")
2320
parser.add_argument("--servicename",
2321
metavar="NAME", help="Zeroconf service name")
2322
parser.add_argument("--configdir",
2323
default="/etc/mandos", metavar="DIR",
2324
help="Directory to search for configuration"
2326
parser.add_argument("--no-dbus", action="store_false",
2327
dest="use_dbus", help="Do not provide D-Bus"
2328
" system bus interface", default=None)
2329
parser.add_argument("--no-ipv6", action="store_false",
2330
dest="use_ipv6", help="Do not use IPv6",
2332
parser.add_argument("--no-restore", action="store_false",
2333
dest="restore", help="Do not restore stored"
2334
" state", default=None)
2335
parser.add_argument("--socket", type=int,
2336
help="Specify a file descriptor to a network"
2337
" socket to use instead of creating one")
2338
parser.add_argument("--statedir", metavar="DIR",
2339
help="Directory to save/restore state in")
2340
parser.add_argument("--foreground", action="store_true",
2341
help="Run in foreground", default=None)
2342
parser.add_argument("--no-zeroconf", action="store_false",
2343
dest="zeroconf", help="Do not use Zeroconf",
2346
options = parser.parse_args()
561
def killme(status = 0):
562
logger.debug("Stopping server with exit status %d", status)
564
if main_loop_started:
570
if __name__ == '__main__':
572
main_loop_started = False
573
parser = OptionParser()
574
parser.add_option("-i", "--interface", type="string",
575
default=None, metavar="IF",
576
help="Bind to interface IF")
577
parser.add_option("-p", "--port", type="int", default=None,
578
help="Port number to receive requests on")
579
parser.add_option("--timeout", type="string", # Parsed later
581
help="Amount of downtime allowed for clients")
582
parser.add_option("--interval", type="string", # Parsed later
584
help="How often to check that a client is up")
585
parser.add_option("--check", action="store_true", default=False,
586
help="Run self-test")
587
parser.add_option("--debug", action="store_true", default=False,
589
(options, args) = parser.parse_args()
2348
591
if options.check:
2350
fail_count, test_count = doctest.testmod()
2351
sys.exit(os.EX_OK if fail_count == 0 else 1)
2353
# Default values for config file for server-global settings
2354
server_defaults = { "interface": "",
2359
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",
2360
"servicename": "Mandos",
2366
"statedir": "/var/lib/mandos",
2367
"foreground": "False",
2371
# Parse config file for server-global settings
2372
server_config = configparser.SafeConfigParser(server_defaults)
2374
server_config.read(os.path.join(options.configdir,
2376
# Convert the SafeConfigParser object to a dict
2377
server_settings = server_config.defaults()
2378
# Use the appropriate methods on the non-string config options
2379
for option in ("debug", "use_dbus", "use_ipv6", "foreground"):
2380
server_settings[option] = server_config.getboolean("DEFAULT",
2382
if server_settings["port"]:
2383
server_settings["port"] = server_config.getint("DEFAULT",
2385
if server_settings["socket"]:
2386
server_settings["socket"] = server_config.getint("DEFAULT",
2388
# Later, stdin will, and stdout and stderr might, be dup'ed
2389
# over with an opened os.devnull. But we don't want this to
2390
# happen with a supplied network socket.
2391
if 0 <= server_settings["socket"] <= 2:
2392
server_settings["socket"] = os.dup(server_settings
2396
# Override the settings from the config file with command line
2398
for option in ("interface", "address", "port", "debug",
2399
"priority", "servicename", "configdir",
2400
"use_dbus", "use_ipv6", "debuglevel", "restore",
2401
"statedir", "socket", "foreground", "zeroconf"):
2402
value = getattr(options, option)
2403
if value is not None:
2404
server_settings[option] = value
2406
# Force all strings to be unicode
2407
for option in server_settings.keys():
2408
if isinstance(server_settings[option], bytes):
2409
server_settings[option] = (server_settings[option]
2411
# Force all boolean options to be boolean
2412
for option in ("debug", "use_dbus", "use_ipv6", "restore",
2413
"foreground", "zeroconf"):
2414
server_settings[option] = bool(server_settings[option])
2415
# Debug implies foreground
2416
if server_settings["debug"]:
2417
server_settings["foreground"] = True
2418
# Now we have our good server settings in "server_settings"
2420
##################################################################
2422
if (not server_settings["zeroconf"] and
2423
not (server_settings["port"]
2424
or server_settings["socket"] != "")):
2425
parser.error("Needs port or socket to work without"
2429
debug = server_settings["debug"]
2430
debuglevel = server_settings["debuglevel"]
2431
use_dbus = server_settings["use_dbus"]
2432
use_ipv6 = server_settings["use_ipv6"]
2433
stored_state_path = os.path.join(server_settings["statedir"],
2435
foreground = server_settings["foreground"]
2436
zeroconf = server_settings["zeroconf"]
2439
initlogger(debug, logging.DEBUG)
2444
level = getattr(logging, debuglevel.upper())
2445
initlogger(debug, level)
2447
if server_settings["servicename"] != "Mandos":
2448
syslogger.setFormatter(logging.Formatter
2449
('Mandos ({}) [%(process)d]:'
2450
' %(levelname)s: %(message)s'
2451
.format(server_settings
2454
# Parse config file with clients
2455
client_config = configparser.SafeConfigParser(Client
2457
client_config.read(os.path.join(server_settings["configdir"],
2460
global mandos_dbus_service
2461
mandos_dbus_service = None
2464
if server_settings["socket"] != "":
2465
socketfd = server_settings["socket"]
2466
tcp_server = MandosServer((server_settings["address"],
2467
server_settings["port"]),
2469
interface=(server_settings["interface"]
2473
server_settings["priority"],
2477
pidfilename = "/run/mandos.pid"
2478
if not os.path.isdir("/run/."):
2479
pidfilename = "/var/run/mandos.pid"
2482
pidfile = open(pidfilename, "w")
2483
except IOError as e:
2484
logger.error("Could not open file %r", pidfilename,
2487
for name in ("_mandos", "mandos", "nobody"):
2489
uid = pwd.getpwnam(name).pw_uid
2490
gid = pwd.getpwnam(name).pw_gid
2500
except OSError as error:
2501
if error.errno != errno.EPERM:
2505
# Enable all possible GnuTLS debugging
2507
# "Use a log level over 10 to enable all debugging options."
2509
gnutls.library.functions.gnutls_global_set_log_level(11)
2511
@gnutls.library.types.gnutls_log_func
2512
def debug_gnutls(level, string):
2513
logger.debug("GnuTLS: %s", string[:-1])
2515
(gnutls.library.functions
2516
.gnutls_global_set_log_function(debug_gnutls))
2518
# Redirect stdin so all checkers get /dev/null
2519
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2520
os.dup2(null, sys.stdin.fileno())
2524
# Need to fork before connecting to D-Bus
2526
# Close all input and output, do double fork, etc.
2529
# multiprocessing will use threads, so before we use gobject we
2530
# need to inform gobject that threads will be used.
2531
gobject.threads_init()
2534
# From the Avahi example code
2535
DBusGMainLoop(set_as_default=True)
596
# Parse the time arguments
598
options.timeout = string_to_delta(options.timeout)
600
parser.error("option --timeout: Unparseable time")
602
options.interval = string_to_delta(options.interval)
604
parser.error("option --interval: Unparseable time")
607
defaults = { "checker": "fping -q -- %%(fqdn)s" }
608
client_config = ConfigParser.SafeConfigParser(defaults)
609
#client_config.readfp(open("secrets.conf"), "secrets.conf")
610
client_config.read("mandos-clients.conf")
612
# From the Avahi server example code
613
DBusGMainLoop(set_as_default=True )
2536
614
main_loop = gobject.MainLoop()
2537
615
bus = dbus.SystemBus()
616
server = dbus.Interface(
617
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
618
avahi.DBUS_INTERFACE_SERVER )
2538
619
# End of Avahi example code
2541
bus_name = dbus.service.BusName("se.recompile.Mandos",
2542
bus, do_not_queue=True)
2543
old_bus_name = (dbus.service.BusName
2544
("se.bsnet.fukt.Mandos", bus,
2546
except dbus.exceptions.NameExistsException as e:
2547
logger.error("Disabling D-Bus:", exc_info=e)
2549
server_settings["use_dbus"] = False
2550
tcp_server.use_dbus = False
2552
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2553
service = AvahiServiceToSyslog(name =
2554
server_settings["servicename"],
2555
servicetype = "_mandos._tcp",
2556
protocol = protocol, bus = bus)
2557
if server_settings["interface"]:
2558
service.interface = (if_nametoindex
2559
(server_settings["interface"]
2562
global multiprocessing_manager
2563
multiprocessing_manager = multiprocessing.Manager()
2565
client_class = Client
2567
client_class = functools.partial(ClientDBus, bus = bus)
2569
client_settings = Client.config_parser(client_config)
2570
old_client_settings = {}
2573
# This is used to redirect stdout and stderr for checker processes
2575
wnull = open(os.devnull, "w") # A writable /dev/null
2576
# Only used if server is running in foreground but not in debug
2578
if debug or not foreground:
2581
# Get client data and settings from last running state.
2582
if server_settings["restore"]:
2584
with open(stored_state_path, "rb") as stored_state:
2585
clients_data, old_client_settings = (pickle.load
2587
os.remove(stored_state_path)
2588
except IOError as e:
2589
if e.errno == errno.ENOENT:
2590
logger.warning("Could not load persistent state: {}"
2591
.format(os.strerror(e.errno)))
2593
logger.critical("Could not load persistent state:",
2596
except EOFError as e:
2597
logger.warning("Could not load persistent state: "
2598
"EOFError:", exc_info=e)
2600
with PGPEngine() as pgp:
2601
for client_name, client in clients_data.items():
2602
# Skip removed clients
2603
if client_name not in client_settings:
2606
# Decide which value to use after restoring saved state.
2607
# We have three different values: Old config file,
2608
# new config file, and saved state.
2609
# New config value takes precedence if it differs from old
2610
# config value, otherwise use saved state.
2611
for name, value in client_settings[client_name].items():
2613
# For each value in new config, check if it
2614
# differs from the old config value (Except for
2615
# the "secret" attribute)
2616
if (name != "secret" and
2617
value != old_client_settings[client_name]
2619
client[name] = value
2623
# Clients who has passed its expire date can still be
2624
# enabled if its last checker was successful. Clients
2625
# whose checker succeeded before we stored its state is
2626
# assumed to have successfully run all checkers during
2628
if client["enabled"]:
2629
if datetime.datetime.utcnow() >= client["expires"]:
2630
if not client["last_checked_ok"]:
2632
"disabling client {} - Client never "
2633
"performed a successful checker"
2634
.format(client_name))
2635
client["enabled"] = False
2636
elif client["last_checker_status"] != 0:
2638
"disabling client {} - Client last"
2639
" checker failed with error code {}"
2640
.format(client_name,
2641
client["last_checker_status"]))
2642
client["enabled"] = False
2644
client["expires"] = (datetime.datetime
2646
+ client["timeout"])
2647
logger.debug("Last checker succeeded,"
2648
" keeping {} enabled"
2649
.format(client_name))
2651
client["secret"] = (
2652
pgp.decrypt(client["encrypted_secret"],
2653
client_settings[client_name]
2656
# If decryption fails, we use secret from new settings
2657
logger.debug("Failed to decrypt {} old secret"
2658
.format(client_name))
2659
client["secret"] = (
2660
client_settings[client_name]["secret"])
2662
# Add/remove clients based on new changes made to config
2663
for client_name in (set(old_client_settings)
2664
- set(client_settings)):
2665
del clients_data[client_name]
2666
for client_name in (set(client_settings)
2667
- set(old_client_settings)):
2668
clients_data[client_name] = client_settings[client_name]
2670
# Create all client objects
2671
for client_name, client in clients_data.items():
2672
tcp_server.clients[client_name] = client_class(
2673
name = client_name, settings = client,
2674
server_settings = server_settings)
2676
if not tcp_server.clients:
2677
logger.warning("No clients defined")
2680
if pidfile is not None:
2684
pidfile.write("{}\n".format(pid).encode("utf-8"))
2686
logger.error("Could not write to file %r with PID %d",
2691
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
2692
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
2695
@alternate_dbus_interfaces({"se.recompile.Mandos":
2696
"se.bsnet.fukt.Mandos"})
2697
class MandosDBusService(DBusObjectWithProperties):
2698
"""A D-Bus proxy object"""
2700
dbus.service.Object.__init__(self, bus, "/")
2701
_interface = "se.recompile.Mandos"
2703
@dbus_interface_annotations(_interface)
2705
return { "org.freedesktop.DBus.Property"
2706
".EmitsChangedSignal":
2709
@dbus.service.signal(_interface, signature="o")
2710
def ClientAdded(self, objpath):
2714
@dbus.service.signal(_interface, signature="ss")
2715
def ClientNotFound(self, fingerprint, address):
2719
@dbus.service.signal(_interface, signature="os")
2720
def ClientRemoved(self, objpath, name):
2724
@dbus.service.method(_interface, out_signature="ao")
2725
def GetAllClients(self):
2727
return dbus.Array(c.dbus_object_path
2729
tcp_server.clients.itervalues())
2731
@dbus.service.method(_interface,
2732
out_signature="a{oa{sv}}")
2733
def GetAllClientsWithProperties(self):
2735
return dbus.Dictionary(
2736
{ c.dbus_object_path: c.GetAll("")
2737
for c in tcp_server.clients.itervalues() },
2740
@dbus.service.method(_interface, in_signature="o")
2741
def RemoveClient(self, object_path):
2743
for c in tcp_server.clients.itervalues():
2744
if c.dbus_object_path == object_path:
2745
del tcp_server.clients[c.name]
2746
c.remove_from_connection()
2747
# Don't signal anything except ClientRemoved
2748
c.disable(quiet=True)
2750
self.ClientRemoved(object_path, c.name)
2752
raise KeyError(object_path)
2756
mandos_dbus_service = MandosDBusService()
621
debug = options.debug
624
console = logging.StreamHandler()
625
# console.setLevel(logging.DEBUG)
626
console.setFormatter(logging.Formatter\
627
('%(levelname)s: %(message)s'))
628
logger.addHandler(console)
632
def remove_from_clients(client):
633
clients.remove(client)
635
logger.debug(u"No clients left, exiting")
638
clients.update(Set(Client(name=section, options=options,
639
stop_hook = remove_from_clients,
640
**(dict(client_config\
642
for section in client_config.sections()))
2759
648
"Cleanup function; run on exit"
2763
multiprocessing.active_children()
2765
if not (tcp_server.clients or client_settings):
2768
# Store client before exiting. Secrets are encrypted with key
2769
# based on what config file has. If config file is
2770
# removed/edited, old secret will thus be unrecovable.
2772
with PGPEngine() as pgp:
2773
for client in tcp_server.clients.itervalues():
2774
key = client_settings[client.name]["secret"]
2775
client.encrypted_secret = pgp.encrypt(client.secret,
2779
# A list of attributes that can not be pickled
2781
exclude = { "bus", "changedstate", "secret",
2782
"checker", "server_settings" }
2783
for name, typ in (inspect.getmembers
2784
(dbus.service.Object)):
2787
client_dict["encrypted_secret"] = (client
2789
for attr in client.client_structure:
2790
if attr not in exclude:
2791
client_dict[attr] = getattr(client, attr)
2793
clients[client.name] = client_dict
2794
del client_settings[client.name]["secret"]
2797
with (tempfile.NamedTemporaryFile
2798
(mode='wb', suffix=".pickle", prefix='clients-',
2799
dir=os.path.dirname(stored_state_path),
2800
delete=False)) as stored_state:
2801
pickle.dump((clients, client_settings), stored_state)
2802
tempname=stored_state.name
2803
os.rename(tempname, stored_state_path)
2804
except (IOError, OSError) as e:
2810
if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
2811
logger.warning("Could not save persistent state: {}"
2812
.format(os.strerror(e.errno)))
2814
logger.warning("Could not save persistent state:",
2818
# Delete all clients, and settings from config
2819
while tcp_server.clients:
2820
name, client = tcp_server.clients.popitem()
2822
client.remove_from_connection()
2823
# Don't signal anything except ClientRemoved
2824
client.disable(quiet=True)
2827
mandos_dbus_service.ClientRemoved(client
2830
client_settings.clear()
650
# From the Avahi server example code
651
if not group is None:
654
# End of Avahi example code
656
for client in clients:
657
client.stop_hook = None
2832
660
atexit.register(cleanup)
2834
for client in tcp_server.clients.itervalues():
2837
mandos_dbus_service.ClientAdded(client.dbus_object_path)
2838
# Need to initiate checking of clients
2840
client.init_checker()
2843
tcp_server.server_activate()
2845
# Find out what port we got
2847
service.port = tcp_server.socket.getsockname()[1]
2849
logger.info("Now listening on address %r, port %d,"
2850
" flowinfo %d, scope_id %d",
2851
*tcp_server.socket.getsockname())
2853
logger.info("Now listening on address %r, port %d",
2854
*tcp_server.socket.getsockname())
2856
#service.interface = tcp_server.socket.getsockname()[3]
2860
# From the Avahi example code
2863
except dbus.exceptions.DBusException as error:
2864
logger.critical("D-Bus Exception", exc_info=error)
2867
# End of Avahi example code
2869
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2870
lambda *args, **kwargs:
2871
(tcp_server.handle_request
2872
(*args[2:], **kwargs) or True))
2874
logger.debug("Starting main loop")
663
signal.signal(signal.SIGINT, signal.SIG_IGN)
664
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
665
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
667
for client in clients:
670
tcp_server = IPv6_TCPServer((None, options.port),
674
# Find out what random port we got
675
servicePort = tcp_server.socket.getsockname()[1]
676
logger.debug(u"Now listening on port %d", servicePort)
678
if options.interface is not None:
679
serviceInterface = if_nametoindex(options.interface)
681
# From the Avahi server example code
682
server.connect_to_signal("StateChanged", server_state_changed)
684
server_state_changed(server.GetState())
685
except dbus.exceptions.DBusException, error:
686
logger.critical(u"DBusException: %s", error)
688
# End of Avahi example code
690
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
691
lambda *args, **kwargs:
692
tcp_server.handle_request(*args[2:],
695
main_loop_started = True
2876
except AvahiError as error:
2877
logger.critical("Avahi Error", exc_info=error)
2880
697
except KeyboardInterrupt:
2882
print("", file=sys.stderr)
2883
logger.debug("Server received KeyboardInterrupt")
2884
logger.debug("Server exiting")
2885
# Must run before the D-Bus bus name gets deregistered
2888
if __name__ == '__main__':