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- Committer: Björn Påhlsson
- Date: 2008-07-21 19:15:06 UTC
- mfrom: (19 mandos)
- mto: This revision was merged to the branch mainline in revision 22.
- Revision ID: belorn@braxen-20080721191506-f4av11wlu2cmmeid
merge
- files added:
- ca.pem
- files removed:
- .bzr-builddeb
- debian
- debian/po
- files renamed:
- clients.conf => mandos-clients.conf
- plugin-runner.c => plugbasedclient.c
- plugins.d/mandos-client.c => plugins.d/mandosclient.c
- plugins.d/password-prompt.c => plugins.d/passprompt.c
- mandos => server.py
- files modified:
- Makefile
added
removed
server.py
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# This program is partly derived from an example program for an Avahi
7
7
# service publisher, downloaded from
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# <http://avahi.org/wiki/PythonPublishExample>. This includes the
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# methods "add" and "remove" in the "AvahiService" class, the
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# "server_state_changed" and "entry_group_state_changed" functions,
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# and some lines in "main".
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# following functions: "add_service", "remove_service",
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# "server_state_changed", "entry_group_state_changed", and some lines
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# in "main".
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#
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# Everything else is
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# Copyright © 2008 Teddy Hogeborn & Björn Påhlsson
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# Everything else is Copyright © 2007-2008 Teddy Hogeborn and Björn
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# Påhlsson.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see
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# <http://www.gnu.org/licenses/>.
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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# Contact the authors at <mandos@fukt.bsnet.se>.
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# Contact the authors at <https://www.fukt.bsnet.se/~belorn/> and
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# <https://www.fukt.bsnet.se/~teddy/>.
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#
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from __future__ import division
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import SocketServer
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import socket
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import select
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from optparse import OptionParser
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import datetime
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import errno
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import stat
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import logging
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import logging.handlers
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import pwd
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import dbus
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import gobject
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import avahi
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from dbus.mainloop.glib import DBusGMainLoop
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import ctypes
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import ctypes.util
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version = "1.0"
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# Brief description of the operation of this program:
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#
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# This server announces itself as a Zeroconf service. Connecting
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# clients use the TLS protocol, with the unusual quirk that this
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# server program acts as a TLS "client" while the connecting clients
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# acts as a TLS "server". The clients (acting as a TLS "server") must
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# supply an OpenPGP certificate, and the fingerprint of this
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# certificate is used by this server to look up (in a list read from a
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# file at start time) which binary blob to give the client. No other
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# authentication or authorization is done by this server.
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logger = logging.Logger('mandos')
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syslogger = logging.handlers.SysLogHandler\
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,
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address = "/dev/log")
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(facility = logging.handlers.SysLogHandler.LOG_DAEMON)
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syslogger.setFormatter(logging.Formatter\
73
('Mandos: %(levelname)s: %(message)s'))
81
('%(levelname)s: %(message)s'))
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logger.addHandler(syslogger)
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console = logging.StreamHandler()
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console.setFormatter(logging.Formatter('%(name)s: %(levelname)s:'
78
' %(message)s'))
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logger.addHandler(console)
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class AvahiError(Exception):
82
def __init__(self, value):
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self.value = value
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super(AvahiError, self).__init__()
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def __str__(self):
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return repr(self.value)
87
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class AvahiServiceError(AvahiError):
89
pass
90
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class AvahiGroupError(AvahiError):
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pass
93
94
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class AvahiService(object):
96
"""An Avahi (Zeroconf) service.
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Attributes:
98
interface: integer; avahi.IF_UNSPEC or an interface index.
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Used to optionally bind to the specified interface.
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name: string; Example: 'Mandos'
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type: string; Example: '_mandos._tcp'.
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See <http://www.dns-sd.org/ServiceTypes.html>
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port: integer; what port to announce
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TXT: list of strings; TXT record for the service
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domain: string; Domain to publish on, default to .local if empty.
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host: string; Host to publish records for, default is localhost
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max_renames: integer; maximum number of renames
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rename_count: integer; counter so we only rename after collisions
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a sensible number of times
110
"""
111
def __init__(self, interface = avahi.IF_UNSPEC, name = None,
112
servicetype = None, port = None, TXT = None, domain = "",
113
host = "", max_renames = 32768):
114
self.interface = interface
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self.name = name
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self.type = servicetype
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self.port = port
118
if TXT is None:
119
self.TXT = []
120
else:
121
self.TXT = TXT
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self.domain = domain
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self.host = host
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self.rename_count = 0
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self.max_renames = max_renames
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def rename(self):
127
"""Derived from the Avahi example code"""
128
if self.rename_count >= self.max_renames:
129
logger.critical(u"No suitable Zeroconf service name found"
130
u" after %i retries, exiting.",
131
self.rename_count)
132
raise AvahiServiceError("Too many renames")
133
self.name = server.GetAlternativeServiceName(self.name)
134
logger.info(u"Changing Zeroconf service name to %r ...",
135
str(self.name))
136
syslogger.setFormatter(logging.Formatter\
137
('Mandos (%s): %%(levelname)s:'
138
' %%(message)s' % self.name))
139
self.remove()
140
self.add()
141
self.rename_count += 1
142
def remove(self):
143
"""Derived from the Avahi example code"""
144
if group is not None:
145
group.Reset()
146
def add(self):
147
"""Derived from the Avahi example code"""
148
global group
149
if group is None:
150
group = dbus.Interface\
151
(bus.get_object(avahi.DBUS_NAME,
152
server.EntryGroupNew()),
153
avahi.DBUS_INTERFACE_ENTRY_GROUP)
154
group.connect_to_signal('StateChanged',
155
entry_group_state_changed)
156
logger.debug(u"Adding Zeroconf service '%s' of type '%s' ...",
157
service.name, service.type)
158
group.AddService(
159
self.interface, # interface
160
avahi.PROTO_INET6, # protocol
161
dbus.UInt32(0), # flags
162
self.name, self.type,
163
self.domain, self.host,
164
dbus.UInt16(self.port),
165
avahi.string_array_to_txt_array(self.TXT))
166
group.Commit()
167
83
del syslogger
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# This variable is used to optionally bind to a specified interface.
86
# It is a global variable to fit in with the other variables from the
87
# Avahi example code.
88
serviceInterface = avahi.IF_UNSPEC
168
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# From the Avahi example code:
169
group = None # our entry group
90
serviceName = "Mandos"
91
serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html
92
servicePort = None # Not known at startup
93
serviceTXT = [] # TXT record for the service
94
domain = "" # Domain to publish on, default to .local
95
host = "" # Host to publish records for, default to localhost
96
group = None #our entry group
97
rename_count = 12 # Counter so we only rename after collisions a
98
# sensible number of times
170
99
# End of Avahi example code
171
100
172
101
177
106
fingerprint: string (40 or 32 hexadecimal digits); used to
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107
uniquely identify the client
179
108
secret: bytestring; sent verbatim (over TLS) to client
180
host: string; available for use by the checker command
181
created: datetime.datetime(); object creation, not client host
182
last_checked_ok: datetime.datetime() or None if not yet checked OK
183
timeout: datetime.timedelta(); How long from last_checked_ok
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until this client is invalid
109
fqdn: string (FQDN); available for use by the checker command
110
created: datetime.datetime()
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last_seen: datetime.datetime() or None if not yet seen
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timeout: datetime.timedelta(); How long from last_seen until
113
this client is invalid
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interval: datetime.timedelta(); How often to start a new checker
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stop_hook: If set, called by stop() as stop_hook(self)
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checker: subprocess.Popen(); a running checker process used
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to see if the client lives.
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'None' if no process is running.
118
Is None if no process is running.
190
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checker_initiator_tag: a gobject event source tag, or None
191
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stop_initiator_tag: - '' -
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checker_callback_tag: - '' -
193
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checker_command: string; External command which is run to check if
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client lives. %() expansions are done at
123
client lives. %()s expansions are done at
195
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runtime with vars(self) as dict, so that for
196
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instance %(name)s can be used in the command.
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126
Private attibutes:
198
127
_timeout: Real variable for 'timeout'
199
128
_interval: Real variable for 'interval'
200
_timeout_milliseconds: Used when calling gobject.timeout_add()
129
_timeout_milliseconds: Used by gobject.timeout_add()
201
130
_interval_milliseconds: - '' -
202
131
"""
203
132
def _set_timeout(self, timeout):
223
152
interval = property(lambda self: self._interval,
224
153
_set_interval)
225
154
del _set_interval
226
def __init__(self, name = None, stop_hook=None, config=None):
227
"""Note: the 'checker' key in 'config' sets the
228
'checker_command' attribute and *not* the 'checker'
229
attribute."""
230
if config is None:
231
config = {}
155
def __init__(self, name=None, options=None, stop_hook=None,
156
fingerprint=None, secret=None, secfile=None,
157
fqdn=None, timeout=None, interval=-1, checker=None):
158
"""Note: the 'checker' argument sets the 'checker_command'
159
attribute and not the 'checker' attribute.."""
232
160
self.name = name
233
logger.debug(u"Creating client %r", self.name)
234
# Uppercase and remove spaces from fingerprint for later
235
# comparison purposes with return value from the fingerprint()
236
# function
237
self.fingerprint = config["fingerprint"].upper()\
238
.replace(u" ", u"")
239
logger.debug(u" Fingerprint: %s", self.fingerprint)
240
if "secret" in config:
241
self.secret = config["secret"].decode(u"base64")
242
elif "secfile" in config:
243
secfile = open(config["secfile"])
244
self.secret = secfile.read()
245
secfile.close()
161
# Uppercase and remove spaces from fingerprint
162
# for later comparison purposes with return value of
163
# the fingerprint() function
164
self.fingerprint = fingerprint.upper().replace(u" ", u"")
165
if secret:
166
self.secret = secret.decode(u"base64")
167
elif secfile:
168
sf = open(secfile)
169
self.secret = sf.read()
170
sf.close()
246
171
else:
247
raise TypeError(u"No secret or secfile for client %s"
248
% self.name)
249
self.host = config.get("host", "")
172
raise RuntimeError(u"No secret or secfile for client %s"
173
% self.name)
174
self.fqdn = fqdn # string
250
175
self.created = datetime.datetime.now()
251
self.last_checked_ok = None
252
self.timeout = string_to_delta(config["timeout"])
253
self.interval = string_to_delta(config["interval"])
176
self.last_seen = None
177
if timeout is None:
178
self.timeout = options.timeout
179
else:
180
self.timeout = string_to_delta(timeout)
181
if interval == -1:
182
self.interval = options.interval
183
else:
184
self.interval = string_to_delta(interval)
254
185
self.stop_hook = stop_hook
255
186
self.checker = None
256
187
self.checker_initiator_tag = None
257
188
self.stop_initiator_tag = None
258
189
self.checker_callback_tag = None
259
self.check_command = config["checker"]
190
self.check_command = checker
260
191
def start(self):
261
192
"""Start this client's checker and timeout hooks"""
262
193
# Schedule a new checker to be started an 'interval' from now,
272
203
self.stop)
273
204
def stop(self):
274
205
"""Stop this client.
275
The possibility that a client might be restarted is left open,
276
but not currently used."""
206
The possibility that this client might be restarted is left
207
open, but not currently used."""
277
208
# If this client doesn't have a secret, it is already stopped.
278
if hasattr(self, "secret") and self.secret:
279
logger.info(u"Stopping client %s", self.name)
209
if self.secret:
210
logger.debug(u"Stopping client %s", self.name)
280
211
self.secret = None
281
212
else:
282
213
return False
283
if getattr(self, "stop_initiator_tag", False):
214
if hasattr(self, "stop_initiator_tag") \
215
and self.stop_initiator_tag:
284
216
gobject.source_remove(self.stop_initiator_tag)
285
217
self.stop_initiator_tag = None
286
if getattr(self, "checker_initiator_tag", False):
218
if hasattr(self, "checker_initiator_tag") \
219
and self.checker_initiator_tag:
287
220
gobject.source_remove(self.checker_initiator_tag)
288
221
self.checker_initiator_tag = None
289
222
self.stop_checker()
301
234
self.checker = None
302
235
if os.WIFEXITED(condition) \
303
236
and (os.WEXITSTATUS(condition) == 0):
304
logger.info(u"Checker for %(name)s succeeded",
305
vars(self))
306
self.last_checked_ok = now
237
logger.debug(u"Checker for %(name)s succeeded",
238
vars(self))
239
self.last_seen = now
307
240
gobject.source_remove(self.stop_initiator_tag)
308
241
self.stop_initiator_tag = gobject.timeout_add\
309
242
(self._timeout_milliseconds,
312
245
logger.warning(u"Checker for %(name)s crashed?",
313
246
vars(self))
314
247
else:
315
logger.info(u"Checker for %(name)s failed",
316
vars(self))
248
logger.debug(u"Checker for %(name)s failed",
249
vars(self))
317
250
def start_checker(self):
318
251
"""Start a new checker subprocess if one is not running.
319
252
If a checker already exists, leave it running and do
328
261
# is as it should be.
329
262
if self.checker is None:
330
263
try:
331
# In case check_command has exactly one % operator
332
command = self.check_command % self.host
264
command = self.check_command % self.fqdn
333
265
except TypeError:
334
# Escape attributes for the shell
335
266
escaped_attrs = dict((key, re.escape(str(val)))
336
267
for key, val in
337
268
vars(self).iteritems())
338
269
try:
339
270
command = self.check_command % escaped_attrs
340
271
except TypeError, error:
341
logger.error(u'Could not format string "%s":'
342
u' %s', self.check_command, error)
272
logger.critical(u'Could not format string "%s":'
273
u' %s', self.check_command, error)
343
274
return True # Try again later
344
275
try:
345
logger.info(u"Starting checker %r for %s",
346
command, self.name)
347
# We don't need to redirect stdout and stderr, since
348
# in normal mode, that is already done by daemon(),
349
# and in debug mode we don't want to. (Stdin is
350
# always replaced by /dev/null.)
351
self.checker = subprocess.Popen(command,
352
close_fds=True,
353
shell=True, cwd="/")
276
logger.debug(u"Starting checker %r for %s",
277
command, self.name)
278
self.checker = subprocess.\
279
Popen(command,
280
close_fds=True, shell=True,
281
cwd="/")
354
282
self.checker_callback_tag = gobject.child_watch_add\
355
283
(self.checker.pid,
356
284
self.checker_callback)
357
except OSError, error:
285
except subprocess.OSError, error:
358
286
logger.error(u"Failed to start subprocess: %s",
359
287
error)
360
288
# Re-run this periodically if run by gobject.timeout_add
364
292
if self.checker_callback_tag:
365
293
gobject.source_remove(self.checker_callback_tag)
366
294
self.checker_callback_tag = None
367
if getattr(self, "checker", None) is None:
295
if not hasattr(self, "checker") or self.checker is None:
368
296
return
369
logger.debug(u"Stopping checker for %(name)s", vars(self))
297
logger.debug("Stopping checker for %(name)s", vars(self))
370
298
try:
371
299
os.kill(self.checker.pid, signal.SIGTERM)
372
300
#os.sleep(0.5)
373
301
#if self.checker.poll() is None:
374
302
# os.kill(self.checker.pid, signal.SIGKILL)
375
303
except OSError, error:
376
if error.errno != errno.ESRCH: # No such process
304
if error.errno != errno.ESRCH:
377
305
raise
378
306
self.checker = None
379
def still_valid(self):
307
def still_valid(self, now=None):
380
308
"""Has the timeout not yet passed for this client?"""
381
now = datetime.datetime.now()
382
if self.last_checked_ok is None:
309
if now is None:
310
now = datetime.datetime.now()
311
if self.last_seen is None:
383
312
return now < (self.created + self.timeout)
384
313
else:
385
return now < (self.last_checked_ok + self.timeout)
314
return now < (self.last_seen + self.timeout)
386
315
387
316
388
317
def peer_certificate(session):
404
333
405
334
def fingerprint(openpgp):
406
335
"Convert an OpenPGP bytestring to a hexdigit fingerprint string"
336
# New empty GnuTLS certificate
337
crt = gnutls.library.types.gnutls_openpgp_crt_t()
338
gnutls.library.functions.gnutls_openpgp_crt_init\
339
(ctypes.byref(crt))
407
340
# New GnuTLS "datum" with the OpenPGP public key
408
341
datum = gnutls.library.types.gnutls_datum_t\
409
342
(ctypes.cast(ctypes.c_char_p(openpgp),
410
343
ctypes.POINTER(ctypes.c_ubyte)),
411
344
ctypes.c_uint(len(openpgp)))
412
# New empty GnuTLS certificate
413
crt = gnutls.library.types.gnutls_openpgp_crt_t()
414
gnutls.library.functions.gnutls_openpgp_crt_init\
415
(ctypes.byref(crt))
416
345
# Import the OpenPGP public key into the certificate
417
gnutls.library.functions.gnutls_openpgp_crt_import\
418
(crt, ctypes.byref(datum),
419
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
420
# Verify the self signature in the key
421
crtverify = ctypes.c_uint()
422
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
423
(crt, 0, ctypes.byref(crtverify))
424
if crtverify.value != 0:
425
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
426
raise gnutls.errors.CertificateSecurityError("Verify failed")
346
ret = gnutls.library.functions.gnutls_openpgp_crt_import\
347
(crt,
348
ctypes.byref(datum),
349
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
427
350
# New buffer for the fingerprint
428
buf = ctypes.create_string_buffer(20)
429
buf_len = ctypes.c_size_t()
351
buffer = ctypes.create_string_buffer(20)
352
buffer_length = ctypes.c_size_t()
430
353
# Get the fingerprint from the certificate into the buffer
431
354
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
432
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
355
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
433
356
# Deinit the certificate
434
357
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
435
358
# Convert the buffer to a Python bytestring
436
fpr = ctypes.string_at(buf, buf_len.value)
359
fpr = ctypes.string_at(buffer, buffer_length.value)
437
360
# Convert the bytestring to hexadecimal notation
438
361
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
439
362
return hex_fpr
440
363
441
364
442
class TCP_handler(SocketServer.BaseRequestHandler, object):
365
class tcp_handler(SocketServer.BaseRequestHandler, object):
443
366
"""A TCP request handler class.
444
367
Instantiated by IPv6_TCPServer for each request to handle it.
445
368
Note: This will run in its own forked process."""
446
369
447
370
def handle(self):
448
logger.info(u"TCP connection from: %s",
371
logger.debug(u"TCP connection from: %s",
449
372
unicode(self.client_address))
450
session = gnutls.connection.ClientSession\
451
(self.request, gnutls.connection.X509Credentials())
452
453
line = self.request.makefile().readline()
454
logger.debug(u"Protocol version: %r", line)
455
try:
456
if int(line.strip().split()[0]) > 1:
457
raise RuntimeError
458
except (ValueError, IndexError, RuntimeError), error:
459
logger.error(u"Unknown protocol version: %s", error)
460
return
461
462
# Note: gnutls.connection.X509Credentials is really a generic
463
# GnuTLS certificate credentials object so long as no X.509
464
# keys are added to it. Therefore, we can use it here despite
465
# using OpenPGP certificates.
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
466
376
467
377
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
468
378
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
469
379
# "+DHE-DSS"))
470
priority = "NORMAL" # Fallback default, since this
471
# MUST be set.
472
if self.server.settings["priority"]:
473
priority = self.server.settings["priority"]
380
priority = "SECURE256"
381
474
382
gnutls.library.functions.gnutls_priority_set_direct\
475
(session._c_object, priority, None)
383
(session._c_object, priority, None);
476
384
477
385
try:
478
386
session.handshake()
479
387
except gnutls.errors.GNUTLSError, error:
480
logger.warning(u"Handshake failed: %s", error)
388
logger.debug(u"Handshake failed: %s", error)
481
389
# Do not run session.bye() here: the session is not
482
390
# established. Just abandon the request.
483
391
return
484
392
try:
485
393
fpr = fingerprint(peer_certificate(session))
486
394
except (TypeError, gnutls.errors.GNUTLSError), error:
487
logger.warning(u"Bad certificate: %s", error)
395
logger.debug(u"Bad certificate: %s", error)
488
396
session.bye()
489
397
return
490
398
logger.debug(u"Fingerprint: %s", fpr)
493
401
if c.fingerprint == fpr:
494
402
client = c
495
403
break
496
if not client:
497
logger.warning(u"Client not found for fingerprint: %s",
498
fpr)
499
session.bye()
500
return
501
404
# Have to check if client.still_valid(), since it is possible
502
405
# that the client timed out while establishing the GnuTLS
503
406
# session.
504
if not client.still_valid():
505
logger.warning(u"Client %(name)s is invalid",
506
vars(client))
407
if (not client) or (not client.still_valid()):
408
if client:
409
logger.debug(u"Client %(name)s is invalid",
410
vars(client))
411
else:
412
logger.debug(u"Client not found for fingerprint: %s",
413
fpr)
507
414
session.bye()
508
415
return
509
416
sent_size = 0
519
426
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
520
427
"""IPv6 TCP server. Accepts 'None' as address and/or port.
521
428
Attributes:
522
settings: Server settings
429
options: Command line options
523
430
clients: Set() of Client objects
524
enabled: Boolean; whether this server is activated yet
525
431
"""
526
432
address_family = socket.AF_INET6
527
433
def __init__(self, *args, **kwargs):
528
if "settings" in kwargs:
529
self.settings = kwargs["settings"]
530
del kwargs["settings"]
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
531
437
if "clients" in kwargs:
532
438
self.clients = kwargs["clients"]
533
439
del kwargs["clients"]
534
self.enabled = False
535
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
440
return super(type(self), self).__init__(*args, **kwargs)
536
441
def server_bind(self):
537
442
"""This overrides the normal server_bind() function
538
443
to bind to an interface if one was specified, and also NOT to
539
444
bind to an address or port if they were not specified."""
540
if self.settings["interface"]:
541
# 25 is from /usr/include/asm-i486/socket.h
542
SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)
445
if self.options.interface:
446
if not hasattr(socket, "SO_BINDTODEVICE"):
447
# From /usr/include/asm-i486/socket.h
448
socket.SO_BINDTODEVICE = 25
543
449
try:
544
450
self.socket.setsockopt(socket.SOL_SOCKET,
545
SO_BINDTODEVICE,
546
self.settings["interface"])
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
547
453
except socket.error, error:
548
454
if error[0] == errno.EPERM:
549
logger.error(u"No permission to"
550
u" bind to interface %s",
551
self.settings["interface"])
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
552
458
else:
553
459
raise error
554
460
# Only bind(2) the socket if we really need to.
557
463
in6addr_any = "::"
558
464
self.server_address = (in6addr_any,
559
465
self.server_address[1])
560
elif not self.server_address[1]:
466
elif self.server_address[1] is None:
561
467
self.server_address = (self.server_address[0],
562
468
0)
563
# if self.settings["interface"]:
564
# self.server_address = (self.server_address[0],
565
# 0, # port
566
# 0, # flowinfo
567
# if_nametoindex
568
# (self.settings
569
# ["interface"]))
570
return super(IPv6_TCPServer, self).server_bind()
571
def server_activate(self):
572
if self.enabled:
573
return super(IPv6_TCPServer, self).server_activate()
574
def enable(self):
575
self.enabled = True
469
return super(type(self), self).server_bind()
576
470
577
471
578
472
def string_to_delta(interval):
588
482
datetime.timedelta(1)
589
483
>>> string_to_delta(u'1w')
590
484
datetime.timedelta(7)
591
>>> string_to_delta('5m 30s')
592
datetime.timedelta(0, 330)
593
485
"""
594
timevalue = datetime.timedelta(0)
595
for s in interval.split():
596
try:
597
suffix = unicode(s[-1])
598
value = int(s[:-1])
599
if suffix == u"d":
600
delta = datetime.timedelta(value)
601
elif suffix == u"s":
602
delta = datetime.timedelta(0, value)
603
elif suffix == u"m":
604
delta = datetime.timedelta(0, 0, 0, 0, value)
605
elif suffix == u"h":
606
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
607
elif suffix == u"w":
608
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
609
else:
610
raise ValueError
611
except (ValueError, IndexError):
486
try:
487
suffix=unicode(interval[-1])
488
value=int(interval[:-1])
489
if suffix == u"d":
490
delta = datetime.timedelta(value)
491
elif suffix == u"s":
492
delta = datetime.timedelta(0, value)
493
elif suffix == u"m":
494
delta = datetime.timedelta(0, 0, 0, 0, value)
495
elif suffix == u"h":
496
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
497
elif suffix == u"w":
498
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
499
else:
612
500
raise ValueError
613
timevalue += delta
614
return timevalue
501
except (ValueError, IndexError):
502
raise ValueError
503
return delta
504
505
506
def add_service():
507
"""Derived from the Avahi example code"""
508
global group, serviceName, serviceType, servicePort, serviceTXT, \
509
domain, host
510
if group is None:
511
group = dbus.Interface(
512
bus.get_object( avahi.DBUS_NAME,
513
server.EntryGroupNew()),
514
avahi.DBUS_INTERFACE_ENTRY_GROUP)
515
group.connect_to_signal('StateChanged',
516
entry_group_state_changed)
517
logger.debug(u"Adding service '%s' of type '%s' ...",
518
serviceName, serviceType)
519
520
group.AddService(
521
serviceInterface, # interface
522
avahi.PROTO_INET6, # protocol
523
dbus.UInt32(0), # flags
524
serviceName, serviceType,
525
domain, host,
526
dbus.UInt16(servicePort),
527
avahi.string_array_to_txt_array(serviceTXT))
528
group.Commit()
529
530
531
def remove_service():
532
"""From the Avahi example code"""
533
global group
534
535
if not group is None:
536
group.Reset()
615
537
616
538
617
539
def server_state_changed(state):
618
540
"""Derived from the Avahi example code"""
619
541
if state == avahi.SERVER_COLLISION:
620
logger.error(u"Zeroconf server name collision")
621
service.remove()
542
logger.warning(u"Server name collision")
543
remove_service()
622
544
elif state == avahi.SERVER_RUNNING:
623
service.add()
545
add_service()
624
546
625
547
626
548
def entry_group_state_changed(state, error):
627
549
"""Derived from the Avahi example code"""
628
logger.debug(u"Avahi state change: %i", state)
550
global serviceName, server, rename_count
551
552
logger.debug(u"state change: %i", state)
629
553
630
554
if state == avahi.ENTRY_GROUP_ESTABLISHED:
631
logger.debug(u"Zeroconf service established.")
555
logger.debug(u"Service established.")
632
556
elif state == avahi.ENTRY_GROUP_COLLISION:
633
logger.warning(u"Zeroconf service name collision.")
634
service.rename()
557
558
rename_count = rename_count - 1
559
if rename_count > 0:
560
name = server.GetAlternativeServiceName(name)
561
logger.warning(u"Service name collision, "
562
u"changing name to '%s' ...", name)
563
remove_service()
564
add_service()
565
566
else:
567
logger.error(u"No suitable service name found after %i"
568
u" retries, exiting.", n_rename)
569
killme(1)
635
570
elif state == avahi.ENTRY_GROUP_FAILURE:
636
logger.critical(u"Avahi: Error in group state changed %s",
637
unicode(error))
638
raise AvahiGroupError("State changed: %s", str(error))
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
639
575
640
576
def if_nametoindex(interface):
641
"""Call the C function if_nametoindex(), or equivalent"""
642
global if_nametoindex
577
"""Call the C function if_nametoindex()"""
643
578
try:
644
if_nametoindex = ctypes.cdll.LoadLibrary\
645
(ctypes.util.find_library("c")).if_nametoindex
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
646
581
except (OSError, AttributeError):
647
582
if "struct" not in sys.modules:
648
583
import struct
649
584
if "fcntl" not in sys.modules:
650
585
import fcntl
651
def if_nametoindex(interface):
652
"Get an interface index the hard way, i.e. using fcntl()"
653
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
654
s = socket.socket()
655
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
656
struct.pack("16s16x", interface))
657
s.close()
658
interface_index = struct.unpack("I", ifreq[16:20])[0]
659
return interface_index
660
return if_nametoindex(interface)
661
662
663
def daemon(nochdir = False, noclose = False):
586
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
587
s = socket.socket()
588
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
589
struct.pack("16s16x", interface))
590
s.close()
591
interface_index = struct.unpack("I", ifreq[16:20])[0]
592
return interface_index
593
594
595
def daemon(nochdir, noclose):
664
596
"""See daemon(3). Standard BSD Unix function.
665
597
This should really exist as os.daemon, but it doesn't (yet)."""
666
598
if os.fork():
668
600
os.setsid()
669
601
if not nochdir:
670
602
os.chdir("/")
671
if os.fork():
672
sys.exit()
673
603
if not noclose:
674
604
# Close all standard open file descriptors
675
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
676
606
if not stat.S_ISCHR(os.fstat(null).st_mode):
677
607
raise OSError(errno.ENODEV,
678
608
"/dev/null not a character device")
683
613
os.close(null)
684
614
685
615
616
def killme(status = 0):
617
logger.debug("Stopping server with exit status %d", status)
618
exitstatus = status
619
if main_loop_started:
620
main_loop.quit()
621
else:
622
sys.exit(status)
623
624
686
625
def main():
687
parser = OptionParser(version = "%%prog %s" % version)
626
global exitstatus
627
exitstatus = 0
628
global main_loop_started
629
main_loop_started = False
630
631
parser = OptionParser()
688
632
parser.add_option("-i", "--interface", type="string",
689
metavar="IF", help="Bind to interface IF")
690
parser.add_option("-a", "--address", type="string",
633
default=None, metavar="IF",
634
help="Bind to interface IF")
635
parser.add_option("-a", "--address", type="string", default=None,
691
636
help="Address to listen for requests on")
692
parser.add_option("-p", "--port", type="int",
637
parser.add_option("-p", "--port", type="int", default=None,
693
638
help="Port number to receive requests on")
639
parser.add_option("--timeout", type="string", # Parsed later
640
default="1h",
641
help="Amount of downtime allowed for clients")
642
parser.add_option("--interval", type="string", # Parsed later
643
default="5m",
644
help="How often to check that a client is up")
694
645
parser.add_option("--check", action="store_true", default=False,
695
646
help="Run self-test")
696
parser.add_option("--debug", action="store_true",
697
help="Debug mode; run in foreground and log to"
698
" terminal")
699
parser.add_option("--priority", type="string", help="GnuTLS"
700
" priority string (see GnuTLS documentation)")
701
parser.add_option("--servicename", type="string", metavar="NAME",
702
help="Zeroconf service name")
703
parser.add_option("--configdir", type="string",
704
default="/etc/mandos", metavar="DIR",
705
help="Directory to search for configuration"
706
" files")
707
options = parser.parse_args()[0]
647
parser.add_option("--debug", action="store_true", default=False,
648
help="Debug mode")
649
(options, args) = parser.parse_args()
708
650
709
651
if options.check:
710
652
import doctest
711
653
doctest.testmod()
712
654
sys.exit()
713
655
714
# Default values for config file for server-global settings
715
server_defaults = { "interface": "",
716
"address": "",
717
"port": "",
718
"debug": "False",
719
"priority":
720
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
721
"servicename": "Mandos",
722
}
723
724
# Parse config file for server-global settings
725
server_config = ConfigParser.SafeConfigParser(server_defaults)
726
del server_defaults
727
server_config.read(os.path.join(options.configdir, "mandos.conf"))
728
# Convert the SafeConfigParser object to a dict
729
server_settings = server_config.defaults()
730
# Use getboolean on the boolean config option
731
server_settings["debug"] = server_config.getboolean\
732
("DEFAULT", "debug")
733
del server_config
734
735
# Override the settings from the config file with command line
736
# options, if set.
737
for option in ("interface", "address", "port", "debug",
738
"priority", "servicename", "configdir"):
739
value = getattr(options, option)
740
if value is not None:
741
server_settings[option] = value
742
del options
743
# Now we have our good server settings in "server_settings"
744
745
debug = server_settings["debug"]
746
747
if not debug:
748
syslogger.setLevel(logging.WARNING)
749
console.setLevel(logging.WARNING)
750
751
if server_settings["servicename"] != "Mandos":
752
syslogger.setFormatter(logging.Formatter\
753
('Mandos (%s): %%(levelname)s:'
754
' %%(message)s'
755
% server_settings["servicename"]))
756
757
# Parse config file with clients
758
client_defaults = { "timeout": "1h",
759
"interval": "5m",
760
"checker": "fping -q -- %(host)s",
761
"host": "",
762
}
763
client_config = ConfigParser.SafeConfigParser(client_defaults)
764
client_config.read(os.path.join(server_settings["configdir"],
765
"clients.conf"))
766
767
clients = Set()
768
tcp_server = IPv6_TCPServer((server_settings["address"],
769
server_settings["port"]),
770
TCP_handler,
771
settings=server_settings,
772
clients=clients)
773
pidfilename = "/var/run/mandos.pid"
774
try:
775
pidfile = open(pidfilename, "w")
776
except IOError, error:
777
logger.error("Could not open file %r", pidfilename)
778
779
uid = 65534
780
gid = 65534
781
try:
782
uid = pwd.getpwnam("mandos").pw_uid
783
except KeyError:
784
try:
785
uid = pwd.getpwnam("nobody").pw_uid
786
except KeyError:
787
pass
788
try:
789
gid = pwd.getpwnam("mandos").pw_gid
790
except KeyError:
791
try:
792
gid = pwd.getpwnam("nogroup").pw_gid
793
except KeyError:
794
pass
795
try:
796
os.setuid(uid)
797
os.setgid(gid)
798
except OSError, error:
799
if error[0] != errno.EPERM:
800
raise error
801
802
global service
803
service = AvahiService(name = server_settings["servicename"],
804
servicetype = "_mandos._tcp", )
805
if server_settings["interface"]:
806
service.interface = if_nametoindex\
807
(server_settings["interface"])
656
# Parse the time arguments
657
try:
658
options.timeout = string_to_delta(options.timeout)
659
except ValueError:
660
parser.error("option --timeout: Unparseable time")
661
try:
662
options.interval = string_to_delta(options.interval)
663
except ValueError:
664
parser.error("option --interval: Unparseable time")
665
666
# Parse config file
667
defaults = { "checker": "fping -q -- %%(fqdn)s" }
668
client_config = ConfigParser.SafeConfigParser(defaults)
669
#client_config.readfp(open("global.conf"), "global.conf")
670
client_config.read("mandos-clients.conf")
808
671
809
672
global main_loop
810
673
global bus
813
676
DBusGMainLoop(set_as_default=True )
814
677
main_loop = gobject.MainLoop()
815
678
bus = dbus.SystemBus()
816
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
817
avahi.DBUS_PATH_SERVER),
818
avahi.DBUS_INTERFACE_SERVER)
679
server = dbus.Interface(
680
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
681
avahi.DBUS_INTERFACE_SERVER )
819
682
# End of Avahi example code
820
683
684
debug = options.debug
685
686
if debug:
687
console = logging.StreamHandler()
688
# console.setLevel(logging.DEBUG)
689
console.setFormatter(logging.Formatter\
690
('%(levelname)s: %(message)s'))
691
logger.addHandler(console)
692
del console
693
694
clients = Set()
821
695
def remove_from_clients(client):
822
696
clients.remove(client)
823
697
if not clients:
824
logger.critical(u"No clients left, exiting")
825
sys.exit()
698
logger.debug(u"No clients left, exiting")
699
killme()
826
700
827
clients.update(Set(Client(name = section,
701
clients.update(Set(Client(name=section, options=options,
828
702
stop_hook = remove_from_clients,
829
config
830
= dict(client_config.items(section)))
703
**(dict(client_config\
704
.items(section))))
831
705
for section in client_config.sections()))
832
if not clients:
833
logger.critical(u"No clients defined")
834
sys.exit(1)
835
836
if debug:
837
# Redirect stdin so all checkers get /dev/null
838
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
839
os.dup2(null, sys.stdin.fileno())
840
if null > 2:
841
os.close(null)
842
else:
843
# No console logging
844
logger.removeHandler(console)
845
# Close all input and output, do double fork, etc.
846
daemon()
847
848
try:
849
pid = os.getpid()
850
pidfile.write(str(pid) + "\n")
851
pidfile.close()
852
del pidfile
853
except IOError:
854
logger.error(u"Could not write to file %r with PID %d",
855
pidfilename, pid)
856
except NameError:
857
# "pidfile" was never created
858
pass
859
del pidfilename
706
707
if not debug:
708
daemon(False, False)
860
709
861
710
def cleanup():
862
711
"Cleanup function; run on exit"
876
725
877
726
if not debug:
878
727
signal.signal(signal.SIGINT, signal.SIG_IGN)
879
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
880
signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())
728
signal.signal(signal.SIGHUP, lambda signum, frame: killme())
729
signal.signal(signal.SIGTERM, lambda signum, frame: killme())
881
730
882
731
for client in clients:
883
732
client.start()
884
733
885
tcp_server.enable()
886
tcp_server.server_activate()
887
888
# Find out what port we got
889
service.port = tcp_server.socket.getsockname()[1]
890
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
891
u" scope_id %d" % tcp_server.socket.getsockname())
892
893
#service.interface = tcp_server.socket.getsockname()[3]
894
895
try:
896
# From the Avahi example code
897
server.connect_to_signal("StateChanged", server_state_changed)
898
try:
899
server_state_changed(server.GetState())
900
except dbus.exceptions.DBusException, error:
901
logger.critical(u"DBusException: %s", error)
902
sys.exit(1)
903
# End of Avahi example code
904
905
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
906
lambda *args, **kwargs:
907
tcp_server.handle_request\
908
(*args[2:], **kwargs) or True)
909
910
logger.debug(u"Starting main loop")
734
tcp_server = IPv6_TCPServer((options.address, options.port),
735
tcp_handler,
736
options=options,
737
clients=clients)
738
# Find out what random port we got
739
global servicePort
740
servicePort = tcp_server.socket.getsockname()[1]
741
logger.debug(u"Now listening on port %d", servicePort)
742
743
if options.interface is not None:
744
global serviceInterface
745
serviceInterface = if_nametoindex(options.interface)
746
747
# From the Avahi example code
748
server.connect_to_signal("StateChanged", server_state_changed)
749
try:
750
server_state_changed(server.GetState())
751
except dbus.exceptions.DBusException, error:
752
logger.critical(u"DBusException: %s", error)
753
killme(1)
754
# End of Avahi example code
755
756
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
757
lambda *args, **kwargs:
758
tcp_server.handle_request(*args[2:],
759
**kwargs) or True)
760
try:
761
logger.debug("Starting main loop")
762
main_loop_started = True
911
763
main_loop.run()
912
except AvahiError, error:
913
logger.critical(u"AvahiError: %s" + unicode(error))
914
sys.exit(1)
915
764
except KeyboardInterrupt:
916
765
if debug:
917
766
print
767
768
sys.exit(exitstatus)
918
769
919
770
if __name__ == '__main__':
920
771
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0