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- Committer: Björn Påhlsson
- Date: 2008-07-22 05:26:44 UTC
- mto: (24.1.154 mandos) (237.4.3 mandos-release)
- mto: This revision was merged to the branch mainline in revision 26.
- Revision ID: belorn@braxen-20080722052644-tq76a3jnr2ea1jez
Added syntax and support for plugbasedclient arguments and how they
are passed on to the plugins.
are passed on to the plugins.
- 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
6
6
# This program is partly derived from an example program for an Avahi
7
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# 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\
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('Mandos: %(levelname)s: %(message)s'))
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('%(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:'
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' %(message)s'))
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logger.addHandler(console)
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class AvahiError(Exception):
82
def __init__(self, value):
83
self.value = value
84
super(AvahiError, self).__init__()
85
def __str__(self):
86
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
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class AvahiService(object):
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"""An Avahi (Zeroconf) service.
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Attributes:
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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
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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
125
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.",
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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))
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syslogger.setFormatter(logging.Formatter\
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('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
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# Avahi example code.
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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
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# sensible number of times
170
99
# End of Avahi example code
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fingerprint: string (40 or 32 hexadecimal digits); used to
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uniquely identify the client
179
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secret: bytestring; sent verbatim (over TLS) to client
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host: string; available for use by the checker command
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created: datetime.datetime(); object creation, not client host
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last_checked_ok: datetime.datetime() or None if not yet checked OK
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timeout: datetime.timedelta(); How long from last_checked_ok
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until this client is invalid
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fqdn: string (FQDN); available for use by the checker command
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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.
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Is None if no process is running.
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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: - '' -
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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
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instance %(name)s can be used in the command.
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Private attibutes:
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127
_timeout: Real variable for 'timeout'
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_interval: Real variable for 'interval'
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_timeout_milliseconds: Used when calling gobject.timeout_add()
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_timeout_milliseconds: Used by gobject.timeout_add()
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_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(os.path.expanduser(os.path.expandvars
244
(config["secfile"])))
245
self.secret = secfile.read()
246
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()
247
171
else:
248
raise TypeError(u"No secret or secfile for client %s"
249
% self.name)
250
self.host = config.get("host", "")
172
raise RuntimeError(u"No secret or secfile for client %s"
173
% self.name)
174
self.fqdn = fqdn # string
251
175
self.created = datetime.datetime.now()
252
self.last_checked_ok = None
253
self.timeout = string_to_delta(config["timeout"])
254
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)
255
185
self.stop_hook = stop_hook
256
186
self.checker = None
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187
self.checker_initiator_tag = None
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self.stop_initiator_tag = None
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189
self.checker_callback_tag = None
260
self.check_command = config["checker"]
190
self.check_command = checker
261
191
def start(self):
262
192
"""Start this client's checker and timeout hooks"""
263
193
# Schedule a new checker to be started an 'interval' from now,
273
203
self.stop)
274
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def stop(self):
275
205
"""Stop this client.
276
The possibility that a client might be restarted is left open,
277
but not currently used."""
206
The possibility that this client might be restarted is left
207
open, but not currently used."""
278
208
# If this client doesn't have a secret, it is already stopped.
279
if hasattr(self, "secret") and self.secret:
280
logger.info(u"Stopping client %s", self.name)
209
if self.secret:
210
logger.debug(u"Stopping client %s", self.name)
281
211
self.secret = None
282
212
else:
283
213
return False
284
if getattr(self, "stop_initiator_tag", False):
214
if hasattr(self, "stop_initiator_tag") \
215
and self.stop_initiator_tag:
285
216
gobject.source_remove(self.stop_initiator_tag)
286
217
self.stop_initiator_tag = None
287
if getattr(self, "checker_initiator_tag", False):
218
if hasattr(self, "checker_initiator_tag") \
219
and self.checker_initiator_tag:
288
220
gobject.source_remove(self.checker_initiator_tag)
289
221
self.checker_initiator_tag = None
290
222
self.stop_checker()
302
234
self.checker = None
303
235
if os.WIFEXITED(condition) \
304
236
and (os.WEXITSTATUS(condition) == 0):
305
logger.info(u"Checker for %(name)s succeeded",
306
vars(self))
307
self.last_checked_ok = now
237
logger.debug(u"Checker for %(name)s succeeded",
238
vars(self))
239
self.last_seen = now
308
240
gobject.source_remove(self.stop_initiator_tag)
309
241
self.stop_initiator_tag = gobject.timeout_add\
310
242
(self._timeout_milliseconds,
313
245
logger.warning(u"Checker for %(name)s crashed?",
314
246
vars(self))
315
247
else:
316
logger.info(u"Checker for %(name)s failed",
317
vars(self))
248
logger.debug(u"Checker for %(name)s failed",
249
vars(self))
318
250
def start_checker(self):
319
251
"""Start a new checker subprocess if one is not running.
320
252
If a checker already exists, leave it running and do
329
261
# is as it should be.
330
262
if self.checker is None:
331
263
try:
332
# In case check_command has exactly one % operator
333
command = self.check_command % self.host
264
command = self.check_command % self.fqdn
334
265
except TypeError:
335
# Escape attributes for the shell
336
266
escaped_attrs = dict((key, re.escape(str(val)))
337
267
for key, val in
338
268
vars(self).iteritems())
339
269
try:
340
270
command = self.check_command % escaped_attrs
341
271
except TypeError, error:
342
logger.error(u'Could not format string "%s":'
343
u' %s', self.check_command, error)
272
logger.critical(u'Could not format string "%s":'
273
u' %s', self.check_command, error)
344
274
return True # Try again later
345
275
try:
346
logger.info(u"Starting checker %r for %s",
347
command, self.name)
348
# We don't need to redirect stdout and stderr, since
349
# in normal mode, that is already done by daemon(),
350
# and in debug mode we don't want to. (Stdin is
351
# always replaced by /dev/null.)
352
self.checker = subprocess.Popen(command,
353
close_fds=True,
354
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="/")
355
282
self.checker_callback_tag = gobject.child_watch_add\
356
283
(self.checker.pid,
357
284
self.checker_callback)
358
except OSError, error:
285
except subprocess.OSError, error:
359
286
logger.error(u"Failed to start subprocess: %s",
360
287
error)
361
288
# Re-run this periodically if run by gobject.timeout_add
365
292
if self.checker_callback_tag:
366
293
gobject.source_remove(self.checker_callback_tag)
367
294
self.checker_callback_tag = None
368
if getattr(self, "checker", None) is None:
295
if not hasattr(self, "checker") or self.checker is None:
369
296
return
370
logger.debug(u"Stopping checker for %(name)s", vars(self))
297
logger.debug("Stopping checker for %(name)s", vars(self))
371
298
try:
372
299
os.kill(self.checker.pid, signal.SIGTERM)
373
300
#os.sleep(0.5)
374
301
#if self.checker.poll() is None:
375
302
# os.kill(self.checker.pid, signal.SIGKILL)
376
303
except OSError, error:
377
if error.errno != errno.ESRCH: # No such process
304
if error.errno != errno.ESRCH:
378
305
raise
379
306
self.checker = None
380
def still_valid(self):
307
def still_valid(self, now=None):
381
308
"""Has the timeout not yet passed for this client?"""
382
now = datetime.datetime.now()
383
if self.last_checked_ok is None:
309
if now is None:
310
now = datetime.datetime.now()
311
if self.last_seen is None:
384
312
return now < (self.created + self.timeout)
385
313
else:
386
return now < (self.last_checked_ok + self.timeout)
314
return now < (self.last_seen + self.timeout)
387
315
388
316
389
317
def peer_certificate(session):
405
333
406
334
def fingerprint(openpgp):
407
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))
408
340
# New GnuTLS "datum" with the OpenPGP public key
409
341
datum = gnutls.library.types.gnutls_datum_t\
410
342
(ctypes.cast(ctypes.c_char_p(openpgp),
411
343
ctypes.POINTER(ctypes.c_ubyte)),
412
344
ctypes.c_uint(len(openpgp)))
413
# New empty GnuTLS certificate
414
crt = gnutls.library.types.gnutls_openpgp_crt_t()
415
gnutls.library.functions.gnutls_openpgp_crt_init\
416
(ctypes.byref(crt))
417
345
# Import the OpenPGP public key into the certificate
418
gnutls.library.functions.gnutls_openpgp_crt_import\
419
(crt, ctypes.byref(datum),
420
gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)
421
# Verify the self signature in the key
422
crtverify = ctypes.c_uint()
423
gnutls.library.functions.gnutls_openpgp_crt_verify_self\
424
(crt, 0, ctypes.byref(crtverify))
425
if crtverify.value != 0:
426
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
427
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)
428
350
# New buffer for the fingerprint
429
buf = ctypes.create_string_buffer(20)
430
buf_len = ctypes.c_size_t()
351
buffer = ctypes.create_string_buffer(20)
352
buffer_length = ctypes.c_size_t()
431
353
# Get the fingerprint from the certificate into the buffer
432
354
gnutls.library.functions.gnutls_openpgp_crt_get_fingerprint\
433
(crt, ctypes.byref(buf), ctypes.byref(buf_len))
355
(crt, ctypes.byref(buffer), ctypes.byref(buffer_length))
434
356
# Deinit the certificate
435
357
gnutls.library.functions.gnutls_openpgp_crt_deinit(crt)
436
358
# Convert the buffer to a Python bytestring
437
fpr = ctypes.string_at(buf, buf_len.value)
359
fpr = ctypes.string_at(buffer, buffer_length.value)
438
360
# Convert the bytestring to hexadecimal notation
439
361
hex_fpr = u''.join(u"%02X" % ord(char) for char in fpr)
440
362
return hex_fpr
441
363
442
364
443
class TCP_handler(SocketServer.BaseRequestHandler, object):
365
class tcp_handler(SocketServer.BaseRequestHandler, object):
444
366
"""A TCP request handler class.
445
367
Instantiated by IPv6_TCPServer for each request to handle it.
446
368
Note: This will run in its own forked process."""
447
369
448
370
def handle(self):
449
logger.info(u"TCP connection from: %s",
371
logger.debug(u"TCP connection from: %s",
450
372
unicode(self.client_address))
451
session = gnutls.connection.ClientSession\
452
(self.request, gnutls.connection.X509Credentials())
453
454
line = self.request.makefile().readline()
455
logger.debug(u"Protocol version: %r", line)
456
try:
457
if int(line.strip().split()[0]) > 1:
458
raise RuntimeError
459
except (ValueError, IndexError, RuntimeError), error:
460
logger.error(u"Unknown protocol version: %s", error)
461
return
462
463
# Note: gnutls.connection.X509Credentials is really a generic
464
# GnuTLS certificate credentials object so long as no X.509
465
# keys are added to it. Therefore, we can use it here despite
466
# using OpenPGP certificates.
373
session = gnutls.connection.ClientSession(self.request,
374
gnutls.connection.\
375
X509Credentials())
467
376
468
377
#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",
469
378
# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",
470
379
# "+DHE-DSS"))
471
priority = "NORMAL" # Fallback default, since this
472
# MUST be set.
473
if self.server.settings["priority"]:
474
priority = self.server.settings["priority"]
380
priority = "SECURE256"
381
475
382
gnutls.library.functions.gnutls_priority_set_direct\
476
(session._c_object, priority, None)
383
(session._c_object, priority, None);
477
384
478
385
try:
479
386
session.handshake()
480
387
except gnutls.errors.GNUTLSError, error:
481
logger.warning(u"Handshake failed: %s", error)
388
logger.debug(u"Handshake failed: %s", error)
482
389
# Do not run session.bye() here: the session is not
483
390
# established. Just abandon the request.
484
391
return
485
392
try:
486
393
fpr = fingerprint(peer_certificate(session))
487
394
except (TypeError, gnutls.errors.GNUTLSError), error:
488
logger.warning(u"Bad certificate: %s", error)
395
logger.debug(u"Bad certificate: %s", error)
489
396
session.bye()
490
397
return
491
398
logger.debug(u"Fingerprint: %s", fpr)
494
401
if c.fingerprint == fpr:
495
402
client = c
496
403
break
497
if not client:
498
logger.warning(u"Client not found for fingerprint: %s",
499
fpr)
500
session.bye()
501
return
502
404
# Have to check if client.still_valid(), since it is possible
503
405
# that the client timed out while establishing the GnuTLS
504
406
# session.
505
if not client.still_valid():
506
logger.warning(u"Client %(name)s is invalid",
507
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)
508
414
session.bye()
509
415
return
510
416
sent_size = 0
520
426
class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):
521
427
"""IPv6 TCP server. Accepts 'None' as address and/or port.
522
428
Attributes:
523
settings: Server settings
429
options: Command line options
524
430
clients: Set() of Client objects
525
enabled: Boolean; whether this server is activated yet
526
431
"""
527
432
address_family = socket.AF_INET6
528
433
def __init__(self, *args, **kwargs):
529
if "settings" in kwargs:
530
self.settings = kwargs["settings"]
531
del kwargs["settings"]
434
if "options" in kwargs:
435
self.options = kwargs["options"]
436
del kwargs["options"]
532
437
if "clients" in kwargs:
533
438
self.clients = kwargs["clients"]
534
439
del kwargs["clients"]
535
self.enabled = False
536
super(IPv6_TCPServer, self).__init__(*args, **kwargs)
440
return super(type(self), self).__init__(*args, **kwargs)
537
441
def server_bind(self):
538
442
"""This overrides the normal server_bind() function
539
443
to bind to an interface if one was specified, and also NOT to
540
444
bind to an address or port if they were not specified."""
541
if self.settings["interface"]:
542
# 25 is from /usr/include/asm-i486/socket.h
543
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
544
449
try:
545
450
self.socket.setsockopt(socket.SOL_SOCKET,
546
SO_BINDTODEVICE,
547
self.settings["interface"])
451
socket.SO_BINDTODEVICE,
452
self.options.interface)
548
453
except socket.error, error:
549
454
if error[0] == errno.EPERM:
550
logger.error(u"No permission to"
551
u" bind to interface %s",
552
self.settings["interface"])
455
logger.warning(u"No permission to"
456
u" bind to interface %s",
457
self.options.interface)
553
458
else:
554
459
raise error
555
460
# Only bind(2) the socket if we really need to.
558
463
in6addr_any = "::"
559
464
self.server_address = (in6addr_any,
560
465
self.server_address[1])
561
elif not self.server_address[1]:
466
elif self.server_address[1] is None:
562
467
self.server_address = (self.server_address[0],
563
468
0)
564
# if self.settings["interface"]:
565
# self.server_address = (self.server_address[0],
566
# 0, # port
567
# 0, # flowinfo
568
# if_nametoindex
569
# (self.settings
570
# ["interface"]))
571
return super(IPv6_TCPServer, self).server_bind()
572
def server_activate(self):
573
if self.enabled:
574
return super(IPv6_TCPServer, self).server_activate()
575
def enable(self):
576
self.enabled = True
469
return super(type(self), self).server_bind()
577
470
578
471
579
472
def string_to_delta(interval):
589
482
datetime.timedelta(1)
590
483
>>> string_to_delta(u'1w')
591
484
datetime.timedelta(7)
592
>>> string_to_delta('5m 30s')
593
datetime.timedelta(0, 330)
594
485
"""
595
timevalue = datetime.timedelta(0)
596
for s in interval.split():
597
try:
598
suffix = unicode(s[-1])
599
value = int(s[:-1])
600
if suffix == u"d":
601
delta = datetime.timedelta(value)
602
elif suffix == u"s":
603
delta = datetime.timedelta(0, value)
604
elif suffix == u"m":
605
delta = datetime.timedelta(0, 0, 0, 0, value)
606
elif suffix == u"h":
607
delta = datetime.timedelta(0, 0, 0, 0, 0, value)
608
elif suffix == u"w":
609
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
610
else:
611
raise ValueError
612
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:
613
500
raise ValueError
614
timevalue += delta
615
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()
616
537
617
538
618
539
def server_state_changed(state):
619
540
"""Derived from the Avahi example code"""
620
541
if state == avahi.SERVER_COLLISION:
621
logger.error(u"Zeroconf server name collision")
622
service.remove()
542
logger.warning(u"Server name collision")
543
remove_service()
623
544
elif state == avahi.SERVER_RUNNING:
624
service.add()
545
add_service()
625
546
626
547
627
548
def entry_group_state_changed(state, error):
628
549
"""Derived from the Avahi example code"""
629
logger.debug(u"Avahi state change: %i", state)
550
global serviceName, server, rename_count
551
552
logger.debug(u"state change: %i", state)
630
553
631
554
if state == avahi.ENTRY_GROUP_ESTABLISHED:
632
logger.debug(u"Zeroconf service established.")
555
logger.debug(u"Service established.")
633
556
elif state == avahi.ENTRY_GROUP_COLLISION:
634
logger.warning(u"Zeroconf service name collision.")
635
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)
636
570
elif state == avahi.ENTRY_GROUP_FAILURE:
637
logger.critical(u"Avahi: Error in group state changed %s",
638
unicode(error))
639
raise AvahiGroupError("State changed: %s", str(error))
571
logger.error(u"Error in group state changed %s",
572
unicode(error))
573
killme(1)
574
640
575
641
576
def if_nametoindex(interface):
642
"""Call the C function if_nametoindex(), or equivalent"""
643
global if_nametoindex
577
"""Call the C function if_nametoindex()"""
644
578
try:
645
if_nametoindex = ctypes.cdll.LoadLibrary\
646
(ctypes.util.find_library("c")).if_nametoindex
579
libc = ctypes.cdll.LoadLibrary("libc.so.6")
580
return libc.if_nametoindex(interface)
647
581
except (OSError, AttributeError):
648
582
if "struct" not in sys.modules:
649
583
import struct
650
584
if "fcntl" not in sys.modules:
651
585
import fcntl
652
def if_nametoindex(interface):
653
"Get an interface index the hard way, i.e. using fcntl()"
654
SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h
655
s = socket.socket()
656
ifreq = fcntl.ioctl(s, SIOCGIFINDEX,
657
struct.pack("16s16x", interface))
658
s.close()
659
interface_index = struct.unpack("I", ifreq[16:20])[0]
660
return interface_index
661
return if_nametoindex(interface)
662
663
664
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):
665
596
"""See daemon(3). Standard BSD Unix function.
666
597
This should really exist as os.daemon, but it doesn't (yet)."""
667
598
if os.fork():
669
600
os.setsid()
670
601
if not nochdir:
671
602
os.chdir("/")
672
if os.fork():
673
sys.exit()
674
603
if not noclose:
675
604
# Close all standard open file descriptors
676
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
605
null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)
677
606
if not stat.S_ISCHR(os.fstat(null).st_mode):
678
607
raise OSError(errno.ENODEV,
679
608
"/dev/null not a character device")
684
613
os.close(null)
685
614
686
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
687
625
def main():
688
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()
689
632
parser.add_option("-i", "--interface", type="string",
690
metavar="IF", help="Bind to interface IF")
691
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,
692
636
help="Address to listen for requests on")
693
parser.add_option("-p", "--port", type="int",
637
parser.add_option("-p", "--port", type="int", default=None,
694
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")
695
645
parser.add_option("--check", action="store_true", default=False,
696
646
help="Run self-test")
697
parser.add_option("--debug", action="store_true",
698
help="Debug mode; run in foreground and log to"
699
" terminal")
700
parser.add_option("--priority", type="string", help="GnuTLS"
701
" priority string (see GnuTLS documentation)")
702
parser.add_option("--servicename", type="string", metavar="NAME",
703
help="Zeroconf service name")
704
parser.add_option("--configdir", type="string",
705
default="/etc/mandos", metavar="DIR",
706
help="Directory to search for configuration"
707
" files")
708
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()
709
650
710
651
if options.check:
711
652
import doctest
712
653
doctest.testmod()
713
654
sys.exit()
714
655
715
# Default values for config file for server-global settings
716
server_defaults = { "interface": "",
717
"address": "",
718
"port": "",
719
"debug": "False",
720
"priority":
721
"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",
722
"servicename": "Mandos",
723
}
724
725
# Parse config file for server-global settings
726
server_config = ConfigParser.SafeConfigParser(server_defaults)
727
del server_defaults
728
server_config.read(os.path.join(options.configdir, "mandos.conf"))
729
# Convert the SafeConfigParser object to a dict
730
server_settings = server_config.defaults()
731
# Use getboolean on the boolean config option
732
server_settings["debug"] = server_config.getboolean\
733
("DEFAULT", "debug")
734
del server_config
735
736
# Override the settings from the config file with command line
737
# options, if set.
738
for option in ("interface", "address", "port", "debug",
739
"priority", "servicename", "configdir"):
740
value = getattr(options, option)
741
if value is not None:
742
server_settings[option] = value
743
del options
744
# Now we have our good server settings in "server_settings"
745
746
debug = server_settings["debug"]
747
748
if not debug:
749
syslogger.setLevel(logging.WARNING)
750
console.setLevel(logging.WARNING)
751
752
if server_settings["servicename"] != "Mandos":
753
syslogger.setFormatter(logging.Formatter\
754
('Mandos (%s): %%(levelname)s:'
755
' %%(message)s'
756
% server_settings["servicename"]))
757
758
# Parse config file with clients
759
client_defaults = { "timeout": "1h",
760
"interval": "5m",
761
"checker": "fping -q -- %(host)s",
762
"host": "",
763
}
764
client_config = ConfigParser.SafeConfigParser(client_defaults)
765
client_config.read(os.path.join(server_settings["configdir"],
766
"clients.conf"))
767
768
clients = Set()
769
tcp_server = IPv6_TCPServer((server_settings["address"],
770
server_settings["port"]),
771
TCP_handler,
772
settings=server_settings,
773
clients=clients)
774
pidfilename = "/var/run/mandos.pid"
775
try:
776
pidfile = open(pidfilename, "w")
777
except IOError, error:
778
logger.error("Could not open file %r", pidfilename)
779
780
uid = 65534
781
gid = 65534
782
try:
783
uid = pwd.getpwnam("mandos").pw_uid
784
except KeyError:
785
try:
786
uid = pwd.getpwnam("nobody").pw_uid
787
except KeyError:
788
pass
789
try:
790
gid = pwd.getpwnam("mandos").pw_gid
791
except KeyError:
792
try:
793
gid = pwd.getpwnam("nogroup").pw_gid
794
except KeyError:
795
pass
796
try:
797
os.setuid(uid)
798
os.setgid(gid)
799
except OSError, error:
800
if error[0] != errno.EPERM:
801
raise error
802
803
global service
804
service = AvahiService(name = server_settings["servicename"],
805
servicetype = "_mandos._tcp", )
806
if server_settings["interface"]:
807
service.interface = if_nametoindex\
808
(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")
809
671
810
672
global main_loop
811
673
global bus
814
676
DBusGMainLoop(set_as_default=True )
815
677
main_loop = gobject.MainLoop()
816
678
bus = dbus.SystemBus()
817
server = dbus.Interface(bus.get_object(avahi.DBUS_NAME,
818
avahi.DBUS_PATH_SERVER),
819
avahi.DBUS_INTERFACE_SERVER)
679
server = dbus.Interface(
680
bus.get_object( avahi.DBUS_NAME, avahi.DBUS_PATH_SERVER ),
681
avahi.DBUS_INTERFACE_SERVER )
820
682
# End of Avahi example code
821
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()
822
695
def remove_from_clients(client):
823
696
clients.remove(client)
824
697
if not clients:
825
logger.critical(u"No clients left, exiting")
826
sys.exit()
698
logger.debug(u"No clients left, exiting")
699
killme()
827
700
828
clients.update(Set(Client(name = section,
701
clients.update(Set(Client(name=section, options=options,
829
702
stop_hook = remove_from_clients,
830
config
831
= dict(client_config.items(section)))
703
**(dict(client_config\
704
.items(section))))
832
705
for section in client_config.sections()))
833
if not clients:
834
logger.critical(u"No clients defined")
835
sys.exit(1)
836
837
if debug:
838
# Redirect stdin so all checkers get /dev/null
839
null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)
840
os.dup2(null, sys.stdin.fileno())
841
if null > 2:
842
os.close(null)
843
else:
844
# No console logging
845
logger.removeHandler(console)
846
# Close all input and output, do double fork, etc.
847
daemon()
848
849
try:
850
pid = os.getpid()
851
pidfile.write(str(pid) + "\n")
852
pidfile.close()
853
del pidfile
854
except IOError:
855
logger.error(u"Could not write to file %r with PID %d",
856
pidfilename, pid)
857
except NameError:
858
# "pidfile" was never created
859
pass
860
del pidfilename
706
707
if not debug:
708
daemon(False, False)
861
709
862
710
def cleanup():
863
711
"Cleanup function; run on exit"
877
725
878
726
if not debug:
879
727
signal.signal(signal.SIGINT, signal.SIG_IGN)
880
signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())
881
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())
882
730
883
731
for client in clients:
884
732
client.start()
885
733
886
tcp_server.enable()
887
tcp_server.server_activate()
888
889
# Find out what port we got
890
service.port = tcp_server.socket.getsockname()[1]
891
logger.info(u"Now listening on address %r, port %d, flowinfo %d,"
892
u" scope_id %d" % tcp_server.socket.getsockname())
893
894
#service.interface = tcp_server.socket.getsockname()[3]
895
896
try:
897
# From the Avahi example code
898
server.connect_to_signal("StateChanged", server_state_changed)
899
try:
900
server_state_changed(server.GetState())
901
except dbus.exceptions.DBusException, error:
902
logger.critical(u"DBusException: %s", error)
903
sys.exit(1)
904
# End of Avahi example code
905
906
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
907
lambda *args, **kwargs:
908
tcp_server.handle_request\
909
(*args[2:], **kwargs) or True)
910
911
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
912
763
main_loop.run()
913
except AvahiError, error:
914
logger.critical(u"AvahiError: %s" + unicode(error))
915
sys.exit(1)
916
764
except KeyboardInterrupt:
917
765
if debug:
918
766
print
767
768
sys.exit(exitstatus)
919
769
920
770
if __name__ == '__main__':
921
771
main()
Loggerhead is a web-based interface for Breezy
Version: 2.0.2.dev0