85
82
except ImportError:
86
83
SO_BINDTODEVICE = None
89
stored_state_file = "clients.pickle"
91
logger = logging.getLogger()
88
#logger = logging.getLogger('mandos')
89
logger = logging.Logger('mandos')
92
90
syslogger = (logging.handlers.SysLogHandler
93
91
(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
94
92
address = str("/dev/log")))
97
if_nametoindex = (ctypes.cdll.LoadLibrary
98
(ctypes.util.find_library("c"))
100
except (OSError, AttributeError):
101
def if_nametoindex(interface):
102
"Get an interface index the hard way, i.e. using fcntl()"
103
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
104
with contextlib.closing(socket.socket()) as s:
105
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
106
struct.pack(str("16s16x"),
108
interface_index = struct.unpack(str("I"),
110
return interface_index
113
def initlogger(debug, level=logging.WARNING):
114
"""init logger and add loglevel"""
116
syslogger.setFormatter(logging.Formatter
117
('Mandos [%(process)d]: %(levelname)s:'
119
logger.addHandler(syslogger)
122
console = logging.StreamHandler()
123
console.setFormatter(logging.Formatter('%(asctime)s %(name)s'
127
logger.addHandler(console)
128
logger.setLevel(level)
131
class PGPError(Exception):
132
"""Exception if encryption/decryption fails"""
136
class PGPEngine(object):
137
"""A simple class for OpenPGP symmetric encryption & decryption"""
139
self.gnupg = GnuPGInterface.GnuPG()
140
self.tempdir = tempfile.mkdtemp(prefix="mandos-")
141
self.gnupg = GnuPGInterface.GnuPG()
142
self.gnupg.options.meta_interactive = False
143
self.gnupg.options.homedir = self.tempdir
144
self.gnupg.options.extra_args.extend(['--force-mdc',
151
def __exit__ (self, exc_type, exc_value, traceback):
159
if self.tempdir is not None:
160
# Delete contents of tempdir
161
for root, dirs, files in os.walk(self.tempdir,
163
for filename in files:
164
os.remove(os.path.join(root, filename))
166
os.rmdir(os.path.join(root, dirname))
168
os.rmdir(self.tempdir)
171
def password_encode(self, password):
172
# Passphrase can not be empty and can not contain newlines or
173
# NUL bytes. So we prefix it and hex encode it.
174
return b"mandos" + binascii.hexlify(password)
176
def encrypt(self, data, password):
177
self.gnupg.passphrase = self.password_encode(password)
178
with open(os.devnull) as devnull:
180
proc = self.gnupg.run(['--symmetric'],
181
create_fhs=['stdin', 'stdout'],
182
attach_fhs={'stderr': devnull})
183
with contextlib.closing(proc.handles['stdin']) as f:
185
with contextlib.closing(proc.handles['stdout']) as f:
186
ciphertext = f.read()
190
self.gnupg.passphrase = None
193
def decrypt(self, data, password):
194
self.gnupg.passphrase = self.password_encode(password)
195
with open(os.devnull) as devnull:
197
proc = self.gnupg.run(['--decrypt'],
198
create_fhs=['stdin', 'stdout'],
199
attach_fhs={'stderr': devnull})
200
with contextlib.closing(proc.handles['stdin'] ) as f:
202
with contextlib.closing(proc.handles['stdout']) as f:
203
decrypted_plaintext = f.read()
207
self.gnupg.passphrase = None
208
return decrypted_plaintext
93
syslogger.setFormatter(logging.Formatter
94
('Mandos [%(process)d]: %(levelname)s:'
96
logger.addHandler(syslogger)
98
console = logging.StreamHandler()
99
console.setFormatter(logging.Formatter('%(name)s [%(process)d]:'
102
logger.addHandler(console)
212
104
class AvahiError(Exception):
213
105
def __init__(self, value, *args, **kwargs):
432
315
"created", "enabled", "fingerprint",
433
316
"host", "interval", "last_checked_ok",
434
317
"last_enabled", "name", "timeout")
435
client_defaults = { "timeout": "5m",
436
"extended_timeout": "15m",
438
"checker": "fping -q -- %%(host)s",
440
"approval_delay": "0s",
441
"approval_duration": "1s",
442
"approved_by_default": "True",
446
319
def timeout_milliseconds(self):
447
320
"Return the 'timeout' attribute in milliseconds"
448
return timedelta_to_milliseconds(self.timeout)
321
return _timedelta_to_milliseconds(self.timeout)
450
323
def extended_timeout_milliseconds(self):
451
324
"Return the 'extended_timeout' attribute in milliseconds"
452
return timedelta_to_milliseconds(self.extended_timeout)
325
return _timedelta_to_milliseconds(self.extended_timeout)
454
327
def interval_milliseconds(self):
455
328
"Return the 'interval' attribute in milliseconds"
456
return timedelta_to_milliseconds(self.interval)
329
return _timedelta_to_milliseconds(self.interval)
458
331
def approval_delay_milliseconds(self):
459
return timedelta_to_milliseconds(self.approval_delay)
462
def config_parser(config):
463
"""Construct a new dict of client settings of this form:
464
{ client_name: {setting_name: value, ...}, ...}
465
with exceptions for any special settings as defined above.
466
NOTE: Must be a pure function. Must return the same result
467
value given the same arguments.
470
for client_name in config.sections():
471
section = dict(config.items(client_name))
472
client = settings[client_name] = {}
474
client["host"] = section["host"]
475
# Reformat values from string types to Python types
476
client["approved_by_default"] = config.getboolean(
477
client_name, "approved_by_default")
478
client["enabled"] = config.getboolean(client_name,
481
client["fingerprint"] = (section["fingerprint"].upper()
483
if "secret" in section:
484
client["secret"] = section["secret"].decode("base64")
485
elif "secfile" in section:
486
with open(os.path.expanduser(os.path.expandvars
487
(section["secfile"])),
489
client["secret"] = secfile.read()
491
raise TypeError("No secret or secfile for section %s"
493
client["timeout"] = string_to_delta(section["timeout"])
494
client["extended_timeout"] = string_to_delta(
495
section["extended_timeout"])
496
client["interval"] = string_to_delta(section["interval"])
497
client["approval_delay"] = string_to_delta(
498
section["approval_delay"])
499
client["approval_duration"] = string_to_delta(
500
section["approval_duration"])
501
client["checker_command"] = section["checker"]
502
client["last_approval_request"] = None
503
client["last_checked_ok"] = None
504
client["last_checker_status"] = None
509
def __init__(self, settings, name = None):
332
return _timedelta_to_milliseconds(self.approval_delay)
334
def __init__(self, name = None, disable_hook=None, config=None):
510
335
"""Note: the 'checker' key in 'config' sets the
511
336
'checker_command' attribute and *not* the 'checker'
514
# adding all client settings
515
for setting, value in settings.iteritems():
516
setattr(self, setting, value)
519
if not hasattr(self, "last_enabled"):
520
self.last_enabled = datetime.datetime.utcnow()
521
if not hasattr(self, "expires"):
522
self.expires = (datetime.datetime.utcnow()
525
self.last_enabled = None
528
341
logger.debug("Creating client %r", self.name)
529
342
# Uppercase and remove spaces from fingerprint for later
530
343
# comparison purposes with return value from the fingerprint()
345
self.fingerprint = (config["fingerprint"].upper()
532
347
logger.debug(" Fingerprint: %s", self.fingerprint)
533
self.created = settings.get("created",
534
datetime.datetime.utcnow())
536
# attributes specific for this server instance
348
if "secret" in config:
349
self.secret = config["secret"].decode("base64")
350
elif "secfile" in config:
351
with open(os.path.expanduser(os.path.expandvars
352
(config["secfile"])),
354
self.secret = secfile.read()
356
raise TypeError("No secret or secfile for client %s"
358
self.host = config.get("host", "")
359
self.created = datetime.datetime.utcnow()
361
self.last_approval_request = None
362
self.last_enabled = None
363
self.last_checked_ok = None
364
self.timeout = string_to_delta(config["timeout"])
365
self.extended_timeout = string_to_delta(config
366
["extended_timeout"])
367
self.interval = string_to_delta(config["interval"])
368
self.disable_hook = disable_hook
537
369
self.checker = None
538
370
self.checker_initiator_tag = None
539
371
self.disable_initiator_tag = None
540
373
self.checker_callback_tag = None
374
self.checker_command = config["checker"]
541
375
self.current_checker_command = None
376
self.last_connect = None
377
self._approved = None
378
self.approved_by_default = config.get("approved_by_default",
543
380
self.approvals_pending = 0
381
self.approval_delay = string_to_delta(
382
config["approval_delay"])
383
self.approval_duration = string_to_delta(
384
config["approval_duration"])
544
385
self.changedstate = (multiprocessing_manager
545
386
.Condition(multiprocessing_manager
547
self.client_structure = [attr for attr in
548
self.__dict__.iterkeys()
549
if not attr.startswith("_")]
550
self.client_structure.append("client_structure")
552
for name, t in inspect.getmembers(type(self),
556
if not name.startswith("_"):
557
self.client_structure.append(name)
559
# Send notice to process children that client state has changed
560
389
def send_changedstate(self):
561
with self.changedstate:
562
self.changedstate.notify_all()
390
self.changedstate.acquire()
391
self.changedstate.notify_all()
392
self.changedstate.release()
564
394
def enable(self):
565
395
"""Start this client's checker and timeout hooks"""
588
428
gobject.source_remove(self.checker_initiator_tag)
589
429
self.checker_initiator_tag = None
590
430
self.stop_checker()
431
if self.disable_hook:
432
self.disable_hook(self)
591
433
self.enabled = False
592
434
# Do not run this again if called by a gobject.timeout_add
595
437
def __del__(self):
438
self.disable_hook = None
598
def init_checker(self):
599
# Schedule a new checker to be started an 'interval' from now,
600
# and every interval from then on.
601
self.checker_initiator_tag = (gobject.timeout_add
602
(self.interval_milliseconds(),
604
# Schedule a disable() when 'timeout' has passed
605
self.disable_initiator_tag = (gobject.timeout_add
606
(self.timeout_milliseconds(),
608
# Also start a new checker *right now*.
611
441
def checker_callback(self, pid, condition, command):
612
442
"""The checker has completed, so take appropriate actions."""
613
443
self.checker_callback_tag = None
614
444
self.checker = None
615
445
if os.WIFEXITED(condition):
616
self.last_checker_status = os.WEXITSTATUS(condition)
617
if self.last_checker_status == 0:
446
exitstatus = os.WEXITSTATUS(condition)
618
448
logger.info("Checker for %(name)s succeeded",
620
450
self.checked_ok()
1104
929
datetime_to_dbus, "LastApprovalRequest")
1105
930
approved_by_default = notifychangeproperty(dbus.Boolean,
1106
931
"ApprovedByDefault")
1107
approval_delay = notifychangeproperty(dbus.UInt64,
932
approval_delay = notifychangeproperty(dbus.UInt16,
1108
933
"ApprovalDelay",
1110
timedelta_to_milliseconds)
935
_timedelta_to_milliseconds)
1111
936
approval_duration = notifychangeproperty(
1112
dbus.UInt64, "ApprovalDuration",
1113
type_func = timedelta_to_milliseconds)
937
dbus.UInt16, "ApprovalDuration",
938
type_func = _timedelta_to_milliseconds)
1114
939
host = notifychangeproperty(dbus.String, "Host")
1115
timeout = notifychangeproperty(dbus.UInt64, "Timeout",
940
timeout = notifychangeproperty(dbus.UInt16, "Timeout",
1117
timedelta_to_milliseconds)
942
_timedelta_to_milliseconds)
1118
943
extended_timeout = notifychangeproperty(
1119
dbus.UInt64, "ExtendedTimeout",
1120
type_func = timedelta_to_milliseconds)
1121
interval = notifychangeproperty(dbus.UInt64,
944
dbus.UInt16, "ExtendedTimeout",
945
type_func = _timedelta_to_milliseconds)
946
interval = notifychangeproperty(dbus.UInt16,
1124
timedelta_to_milliseconds)
949
_timedelta_to_milliseconds)
1125
950
checker_command = notifychangeproperty(dbus.String, "Checker")
1127
952
del notifychangeproperty
1356
1181
if value is None: # get
1357
1182
return dbus.UInt64(self.timeout_milliseconds())
1358
1183
self.timeout = datetime.timedelta(0, 0, 0, value)
1184
if getattr(self, "disable_initiator_tag", None) is None:
1359
1186
# Reschedule timeout
1361
now = datetime.datetime.utcnow()
1362
time_to_die = timedelta_to_milliseconds(
1363
(self.last_checked_ok + self.timeout) - now)
1364
if time_to_die <= 0:
1365
# The timeout has passed
1368
self.expires = (now +
1369
datetime.timedelta(milliseconds =
1371
if (getattr(self, "disable_initiator_tag", None)
1374
gobject.source_remove(self.disable_initiator_tag)
1375
self.disable_initiator_tag = (gobject.timeout_add
1187
gobject.source_remove(self.disable_initiator_tag)
1188
self.disable_initiator_tag = None
1190
time_to_die = (self.
1191
_timedelta_to_milliseconds((self
1196
if time_to_die <= 0:
1197
# The timeout has passed
1200
self.expires = (datetime.datetime.utcnow()
1201
+ datetime.timedelta(milliseconds =
1203
self.disable_initiator_tag = (gobject.timeout_add
1204
(time_to_die, self.disable))
1379
1206
# ExtendedTimeout - property
1380
1207
@dbus_service_property(_interface, signature="t",
2194
2030
client_class = functools.partial(ClientDBusTransitional,
2197
client_settings = Client.config_parser(client_config)
2198
old_client_settings = {}
2201
# Get client data and settings from last running state.
2202
if server_settings["restore"]:
2204
with open(stored_state_path, "rb") as stored_state:
2205
clients_data, old_client_settings = (pickle.load
2207
os.remove(stored_state_path)
2208
except IOError as e:
2209
logger.warning("Could not load persistent state: {0}"
2211
if e.errno != errno.ENOENT:
2213
except EOFError as e:
2214
logger.warning("Could not load persistent state: "
2215
"EOFError: {0}".format(e))
2217
with PGPEngine() as pgp:
2218
for client_name, client in clients_data.iteritems():
2219
# Decide which value to use after restoring saved state.
2220
# We have three different values: Old config file,
2221
# new config file, and saved state.
2222
# New config value takes precedence if it differs from old
2223
# config value, otherwise use saved state.
2224
for name, value in client_settings[client_name].items():
2226
# For each value in new config, check if it
2227
# differs from the old config value (Except for
2228
# the "secret" attribute)
2229
if (name != "secret" and
2230
value != old_client_settings[client_name]
2232
client[name] = value
2236
# Clients who has passed its expire date can still be
2237
# enabled if its last checker was successful. Clients
2238
# whose checker succeeded before we stored its state is
2239
# assumed to have successfully run all checkers during
2241
if client["enabled"]:
2242
if datetime.datetime.utcnow() >= client["expires"]:
2243
if not client["last_checked_ok"]:
2245
"disabling client {0} - Client never "
2246
"performed a successful checker"
2247
.format(client_name))
2248
client["enabled"] = False
2249
elif client["last_checker_status"] != 0:
2251
"disabling client {0} - Client "
2252
"last checker failed with error code {1}"
2253
.format(client_name,
2254
client["last_checker_status"]))
2255
client["enabled"] = False
2257
client["expires"] = (datetime.datetime
2259
+ client["timeout"])
2260
logger.debug("Last checker succeeded,"
2261
" keeping {0} enabled"
2262
.format(client_name))
2032
def client_config_items(config, section):
2033
special_settings = {
2034
"approved_by_default":
2035
lambda: config.getboolean(section,
2036
"approved_by_default"),
2038
for name, value in config.items(section):
2264
client["secret"] = (
2265
pgp.decrypt(client["encrypted_secret"],
2266
client_settings[client_name]
2269
# If decryption fails, we use secret from new settings
2270
logger.debug("Failed to decrypt {0} old secret"
2271
.format(client_name))
2272
client["secret"] = (
2273
client_settings[client_name]["secret"])
2276
# Add/remove clients based on new changes made to config
2277
for client_name in (set(old_client_settings)
2278
- set(client_settings)):
2279
del clients_data[client_name]
2280
for client_name in (set(client_settings)
2281
- set(old_client_settings)):
2282
clients_data[client_name] = client_settings[client_name]
2284
# Create all client objects
2285
for client_name, client in clients_data.iteritems():
2286
tcp_server.clients[client_name] = client_class(
2287
name = client_name, settings = client)
2040
yield (name, special_settings[name]())
2044
tcp_server.clients.update(set(
2045
client_class(name = section,
2046
config= dict(client_config_items(
2047
client_config, section)))
2048
for section in client_config.sections()))
2289
2049
if not tcp_server.clients:
2290
2050
logger.warning("No clients defined")
2369
2129
"Cleanup function; run on exit"
2370
2130
service.cleanup()
2372
multiprocessing.active_children()
2373
if not (tcp_server.clients or client_settings):
2376
# Store client before exiting. Secrets are encrypted with key
2377
# based on what config file has. If config file is
2378
# removed/edited, old secret will thus be unrecovable.
2380
with PGPEngine() as pgp:
2381
for client in tcp_server.clients.itervalues():
2382
key = client_settings[client.name]["secret"]
2383
client.encrypted_secret = pgp.encrypt(client.secret,
2387
# A list of attributes that can not be pickled
2389
exclude = set(("bus", "changedstate", "secret",
2391
for name, typ in (inspect.getmembers
2392
(dbus.service.Object)):
2395
client_dict["encrypted_secret"] = (client
2397
for attr in client.client_structure:
2398
if attr not in exclude:
2399
client_dict[attr] = getattr(client, attr)
2401
clients[client.name] = client_dict
2402
del client_settings[client.name]["secret"]
2405
tempfd, tempname = tempfile.mkstemp(suffix=".pickle",
2408
(stored_state_path))
2409
with os.fdopen(tempfd, "wb") as stored_state:
2410
pickle.dump((clients, client_settings), stored_state)
2411
os.rename(tempname, stored_state_path)
2412
except (IOError, OSError) as e:
2413
logger.warning("Could not save persistent state: {0}"
2420
if e.errno not in set((errno.ENOENT, errno.EACCES,
2424
# Delete all clients, and settings from config
2425
2132
while tcp_server.clients:
2426
name, client = tcp_server.clients.popitem()
2133
client = tcp_server.clients.pop()
2428
2135
client.remove_from_connection()
2136
client.disable_hook = None
2429
2137
# Don't signal anything except ClientRemoved
2430
2138
client.disable(quiet=True)