/mandos/trunk : revision 26

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# This program is partly derived from an example program for an Avahi

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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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# 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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# You should have received a copy of the GNU General Public License

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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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from dbus.mainloop.glib import DBusGMainLoop

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import ctypes

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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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logger.addHandler(syslogger)

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del syslogger

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class AvahiError(Exception):

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def __init__(self, value):

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self.value = value

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def __str__(self):

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return repr(self.value)

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class AvahiServiceError(AvahiError):

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pass

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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

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"""

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def __init__(self, interface = avahi.IF_UNSPEC, name = None,

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type = None, port = None, TXT = None, domain = "",

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host = "", max_renames = 12):

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self.interface = interface

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self.name = name

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self.type = type

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self.port = port

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if TXT is None:

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self.TXT = []

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else:

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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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def rename(self):

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"""Derived from the Avahi example code"""

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if self.rename_count >= self.max_renames:

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logger.critical(u"No suitable service name found after %i"

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u" retries, exiting.", rename_count)

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raise AvahiServiceError("Too many renames")

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name = server.GetAlternativeServiceName(name)

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logger.error(u"Changing name to %r ...", name)

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self.remove()

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self.add()

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self.rename_count += 1

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def remove(self):

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"""Derived from the Avahi example code"""

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if group is not None:

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group.Reset()

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def add(self):

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"""Derived from the Avahi example code"""

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global group

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if group is None:

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group = dbus.Interface\

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(bus.get_object(avahi.DBUS_NAME,

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server.EntryGroupNew()),

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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group.connect_to_signal('StateChanged',

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entry_group_state_changed)

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logger.debug(u"Adding service '%s' of type '%s' ...",

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service.name, service.type)

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group.AddService(

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self.interface, # interface

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avahi.PROTO_INET6, # protocol

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dbus.UInt32(0), # flags

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self.name, self.type,

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self.domain, self.host,

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dbus.UInt16(self.port),

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avahi.string_array_to_txt_array(self.TXT))

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group.Commit()

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# This variable is used to optionally bind to a specified interface.

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# 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

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# From the Avahi example code:

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group = None # our entry group

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serviceName = None

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serviceType = "_mandos._tcp" # http://www.dns-sd.org/ServiceTypes.html

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servicePort = None # Not known at startup

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serviceTXT = [] # TXT record for the service

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domain = "" # Domain to publish on, default to .local

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host = "" # Host to publish records for, default to localhost

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group = None #our entry group

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rename_count = 12 # Counter so we only rename after collisions a

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# sensible number of times

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# End of Avahi example code

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uniquely identify the client

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secret: bytestring; sent verbatim (over TLS) to client

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fqdn: string (FQDN); 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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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

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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

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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

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client lives. %()s expansions are done at

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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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_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: - '' -

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"""

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def _set_timeout(self, timeout):

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interval = property(lambda self: self._interval,

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_set_interval)

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del _set_interval

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def __init__(self, name = None, stop_hook=None, config={}):

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"""Note: the 'checker' key in 'config' sets the

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'checker_command' attribute and *not* the 'checker'

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attribute."""

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def __init__(self, name=None, stop_hook=None, fingerprint=None,

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secret=None, secfile=None, fqdn=None, timeout=None,

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interval=-1, checker=None):

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"""Note: the 'checker' argument sets the 'checker_command'

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attribute and not the 'checker' attribute.."""

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self.name = name

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logger.debug(u"Creating client %r", self.name)

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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self.fingerprint = config["fingerprint"].upper()\

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.replace(u" ", u"")

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# Uppercase and remove spaces from fingerprint

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# for later comparison purposes with return value of

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# the fingerprint() function

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self.fingerprint = fingerprint.upper().replace(u" ", u"")

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logger.debug(u" Fingerprint: %s", self.fingerprint)

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if "secret" in config:

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self.secret = config["secret"].decode(u"base64")

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elif "secfile" in config:

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sf = open(config["secfile"])

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if secret:

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self.secret = secret.decode(u"base64")

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elif secfile:

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sf = open(secfile)

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self.secret = sf.read()

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sf.close()

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else:

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raise TypeError(u"No secret or secfile for client %s"

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% self.name)

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self.fqdn = config.get("fqdn", "")

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raise RuntimeError(u"No secret or secfile for client %s"

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% self.name)

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self.fqdn = fqdn # string

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self.created = datetime.datetime.now()

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self.last_checked_ok = None

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self.timeout = string_to_delta(config["timeout"])

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self.interval = string_to_delta(config["interval"])

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self.last_seen = None

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self.timeout = string_to_delta(timeout)

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self.interval = string_to_delta(interval)

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self.stop_hook = stop_hook

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self.checker = None

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self.checker_initiator_tag = None

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self.stop_initiator_tag = None

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self.checker_callback_tag = None

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self.check_command = config["checker"]

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self.check_command = checker

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def start(self):

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"""Start this client's checker and timeout hooks"""

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# Schedule a new checker to be started an 'interval' from now,

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self.stop)

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def stop(self):

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"""Stop this client.

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The possibility that a client might be restarted is left open,

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but not currently used."""

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The possibility that this client might be restarted is left

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open, but not currently used."""

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# If this client doesn't have a secret, it is already stopped.

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if self.secret:

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logger.info(u"Stopping client %s", self.name)

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logger.debug(u"Stopping client %s", self.name)

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self.secret = None

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else:

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return False

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if getattr(self, "stop_initiator_tag", False):

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if hasattr(self, "stop_initiator_tag") \

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and self.stop_initiator_tag:

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gobject.source_remove(self.stop_initiator_tag)

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self.stop_initiator_tag = None

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if getattr(self, "checker_initiator_tag", False):

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if hasattr(self, "checker_initiator_tag") \

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and self.checker_initiator_tag:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.checker = None

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if os.WIFEXITED(condition) \

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and (os.WEXITSTATUS(condition) == 0):

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logger.info(u"Checker for %(name)s succeeded",

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vars(self))

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self.last_checked_ok = now

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logger.debug(u"Checker for %(name)s succeeded",

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vars(self))

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self.last_seen = now

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gobject.source_remove(self.stop_initiator_tag)

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self.stop_initiator_tag = gobject.timeout_add\

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(self._timeout_milliseconds,

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logger.warning(u"Checker for %(name)s crashed?",

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vars(self))

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else:

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logger.info(u"Checker for %(name)s failed",

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vars(self))

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logger.debug(u"Checker for %(name)s failed",

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vars(self))

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def start_checker(self):

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"""Start a new checker subprocess if one is not running.

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If a checker already exists, leave it running and do

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# is as it should be.

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if self.checker is None:

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try:

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# In case check_command has exactly one % operator

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command = self.check_command % self.fqdn

317

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except TypeError:

318

# Escape attributes for the shell

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escaped_attrs = dict((key, re.escape(str(val)))

320

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for key, val in

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vars(self).iteritems())

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try:

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command = self.check_command % escaped_attrs

324

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except TypeError, error:

325

logger.error(u'Could not format string "%s":'

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u' %s', self.check_command, error)

268

logger.critical(u'Could not format string "%s":'

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u' %s', self.check_command, error)

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return True # Try again later

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try:

329

logger.info(u"Starting checker %r for %s",

330

command, self.name)

331

self.checker = subprocess.Popen(command,

332

close_fds=True,

333

shell=True, cwd="/")

272

logger.debug(u"Starting checker %r for %s",

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command, self.name)

274

self.checker = subprocess.\

275

Popen(command,

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close_fds=True, shell=True,

277

cwd="/")

334

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self.checker_callback_tag = gobject.child_watch_add\

335

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(self.checker.pid,

336

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self.checker_callback)

344

288

if self.checker_callback_tag:

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gobject.source_remove(self.checker_callback_tag)

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self.checker_callback_tag = None

347

if getattr(self, "checker", None) is None:

291

if not hasattr(self, "checker") or self.checker is None:

348

292

return

349

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logger.debug("Stopping checker for %(name)s", vars(self))

350

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try:

353

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#if self.checker.poll() is None:

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# os.kill(self.checker.pid, signal.SIGKILL)

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except OSError, error:

356

if error.errno != errno.ESRCH: # No such process

300

if error.errno != errno.ESRCH:

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raise

358

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self.checker = None

359

def still_valid(self):

303

def still_valid(self, now=None):

360

304

"""Has the timeout not yet passed for this client?"""

361

now = datetime.datetime.now()

362

if self.last_checked_ok is None:

305

if now is None:

306

now = datetime.datetime.now()

307

if self.last_seen is None:

363

308

return now < (self.created + self.timeout)

364

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else:

365

return now < (self.last_checked_ok + self.timeout)

310

return now < (self.last_seen + self.timeout)

366

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367

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368

313

def peer_certificate(session):

384

329

385

330

def fingerprint(openpgp):

386

331

"Convert an OpenPGP bytestring to a hexdigit fingerprint string"

332

# New empty GnuTLS certificate

333

crt = gnutls.library.types.gnutls_openpgp_crt_t()

334

gnutls.library.functions.gnutls_openpgp_crt_init\

335

(ctypes.byref(crt))

387

336

# New GnuTLS "datum" with the OpenPGP public key

388

337

datum = gnutls.library.types.gnutls_datum_t\

389

338

(ctypes.cast(ctypes.c_char_p(openpgp),

390

339

ctypes.POINTER(ctypes.c_ubyte)),

391

340

ctypes.c_uint(len(openpgp)))

392

# New empty GnuTLS certificate

393

crt = gnutls.library.types.gnutls_openpgp_crt_t()

394

gnutls.library.functions.gnutls_openpgp_crt_init\

395

(ctypes.byref(crt))

396

341

# Import the OpenPGP public key into the certificate

397

gnutls.library.functions.gnutls_openpgp_crt_import\

398

(crt, ctypes.byref(datum),

399

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

342

ret = gnutls.library.functions.gnutls_openpgp_crt_import\

343

(crt,

344

ctypes.byref(datum),

345

gnutls.library.constants.GNUTLS_OPENPGP_FMT_RAW)

400

346

# New buffer for the fingerprint

401

347

buffer = ctypes.create_string_buffer(20)

402

348

buffer_length = ctypes.c_size_t()

418

364

Note: This will run in its own forked process."""

419

365

420

366

def handle(self):

421

logger.info(u"TCP connection from: %s",

367

logger.debug(u"TCP connection from: %s",

422

368

unicode(self.client_address))

423

session = gnutls.connection.ClientSession\

424

(self.request, gnutls.connection.X509Credentials())

425

426

line = self.request.makefile().readline()

427

logger.debug(u"Protocol version: %r", line)

428

try:

429

if int(line.strip().split()[0]) > 1:

430

raise RuntimeError

431

except (ValueError, IndexError, RuntimeError), error:

432

logger.error(u"Unknown protocol version: %s", error)

433

return

434

435

# Note: gnutls.connection.X509Credentials is really a generic

436

# GnuTLS certificate credentials object so long as no X.509

437

# keys are added to it. Therefore, we can use it here despite

438

# using OpenPGP certificates.

369

session = gnutls.connection.ClientSession(self.request,

370

gnutls.connection.\

371

X509Credentials())

439

372

440

373

#priority = ':'.join(("NONE", "+VERS-TLS1.1", "+AES-256-CBC",

441

374

# "+SHA1", "+COMP-NULL", "+CTYPE-OPENPGP",

442

375

# "+DHE-DSS"))

443

priority = "NORMAL" # Fallback default, since this

444

# MUST be set.

445

if self.server.settings["priority"]:

446

priority = self.server.settings["priority"]

376

priority = "NORMAL"

377

if self.server.options.priority:

378

priority = self.server.options.priority

447

379

gnutls.library.functions.gnutls_priority_set_direct\

448

380

(session._c_object, priority, None);

449

381

450

382

try:

451

383

session.handshake()

452

384

except gnutls.errors.GNUTLSError, error:

453

logger.warning(u"Handshake failed: %s", error)

385

logger.debug(u"Handshake failed: %s", error)

454

386

# Do not run session.bye() here: the session is not

455

387

# established. Just abandon the request.

456

388

return

457

389

try:

458

390

fpr = fingerprint(peer_certificate(session))

459

391

except (TypeError, gnutls.errors.GNUTLSError), error:

460

logger.warning(u"Bad certificate: %s", error)

392

logger.debug(u"Bad certificate: %s", error)

461

393

session.bye()

462

394

return

463

395

logger.debug(u"Fingerprint: %s", fpr)

466

398

if c.fingerprint == fpr:

467

399

client = c

468

400

break

469

if not client:

470

logger.warning(u"Client not found for fingerprint: %s",

471

fpr)

472

session.bye()

473

return

474

401

# Have to check if client.still_valid(), since it is possible

475

402

# that the client timed out while establishing the GnuTLS

476

403

# session.

477

if not client.still_valid():

478

logger.warning(u"Client %(name)s is invalid",

479

vars(client))

404

if (not client) or (not client.still_valid()):

405

if client:

406

logger.debug(u"Client %(name)s is invalid",

407

vars(client))

408

else:

409

logger.debug(u"Client not found for fingerprint: %s",

410

fpr)

480

411

session.bye()

481

412

return

482

413

sent_size = 0

492

423

class IPv6_TCPServer(SocketServer.ForkingTCPServer, object):

493

424

"""IPv6 TCP server. Accepts 'None' as address and/or port.

494

425

Attributes:

495

settings: Server settings

426

options: Command line options

496

427

clients: Set() of Client objects

497

428

"""

498

429

address_family = socket.AF_INET6

499

430

def __init__(self, *args, **kwargs):

500

if "settings" in kwargs:

501

self.settings = kwargs["settings"]

502

del kwargs["settings"]

431

if "options" in kwargs:

432

self.options = kwargs["options"]

433

del kwargs["options"]

503

434

if "clients" in kwargs:

504

435

self.clients = kwargs["clients"]

505

436

del kwargs["clients"]

508

439

"""This overrides the normal server_bind() function

509

440

to bind to an interface if one was specified, and also NOT to

510

441

bind to an address or port if they were not specified."""

511

if self.settings["interface"]:

512

# 25 is from /usr/include/asm-i486/socket.h

513

SO_BINDTODEVICE = getattr(socket, "SO_BINDTODEVICE", 25)

442

if self.options.interface:

443

if not hasattr(socket, "SO_BINDTODEVICE"):

444

# From /usr/include/asm-i486/socket.h

445

socket.SO_BINDTODEVICE = 25

514

446

try:

515

447

self.socket.setsockopt(socket.SOL_SOCKET,

516

SO_BINDTODEVICE,

517

self.settings["interface"])

448

socket.SO_BINDTODEVICE,

449

self.options.interface)

518

450

except socket.error, error:

519

451

if error[0] == errno.EPERM:

520

logger.error(u"No permission to"

521

u" bind to interface %s",

522

self.settings["interface"])

452

logger.warning(u"No permission to"

453

u" bind to interface %s",

454

self.options.interface)

523

455

else:

524

456

raise error

525

457

# Only bind(2) the socket if we really need to.

528

460

in6addr_any = "::"

529

461

self.server_address = (in6addr_any,

530

462

self.server_address[1])

531

elif not self.server_address[1]:

463

elif self.server_address[1] is None:

532

464

self.server_address = (self.server_address[0],

533

465

0)

534

# if self.settings["interface"]:

535

# self.server_address = (self.server_address[0],

536

# 0, # port

537

# 0, # flowinfo

538

# if_nametoindex

539

# (self.settings

540

# ["interface"]))

541

466

return super(type(self), self).server_bind()

542

467

543

468

575

500

return delta

576

501

577

502

503

def add_service():

504

"""Derived from the Avahi example code"""

505

global group, serviceName, serviceType, servicePort, serviceTXT, \

506

domain, host

507

if group is None:

508

group = dbus.Interface(

509

bus.get_object( avahi.DBUS_NAME,

510

server.EntryGroupNew()),

511

avahi.DBUS_INTERFACE_ENTRY_GROUP)

512

group.connect_to_signal('StateChanged',

513

entry_group_state_changed)

514

logger.debug(u"Adding service '%s' of type '%s' ...",

515

serviceName, serviceType)

516

517

group.AddService(

518

serviceInterface, # interface

519

avahi.PROTO_INET6, # protocol

520

dbus.UInt32(0), # flags

521

serviceName, serviceType,

522

domain, host,

523

dbus.UInt16(servicePort),

524

avahi.string_array_to_txt_array(serviceTXT))

525

group.Commit()

526

527

528

def remove_service():

529

"""From the Avahi example code"""

530

global group

531

532

if not group is None:

533

group.Reset()

534

535

578

536

def server_state_changed(state):

579

537

"""Derived from the Avahi example code"""

580

538

if state == avahi.SERVER_COLLISION:

581

logger.error(u"Server name collision")

582

service.remove()

539

logger.warning(u"Server name collision")

540

remove_service()

583

541

elif state == avahi.SERVER_RUNNING:

584

service.add()

542

add_service()

585

543

586

544

587

545

def entry_group_state_changed(state, error):

588

546

"""Derived from the Avahi example code"""

547

global serviceName, server, rename_count

548

589

549

logger.debug(u"state change: %i", state)

590

550

591

551

if state == avahi.ENTRY_GROUP_ESTABLISHED:

592

552

logger.debug(u"Service established.")

593

553

elif state == avahi.ENTRY_GROUP_COLLISION:

594

logger.warning(u"Service name collision.")

595

service.rename()

554

555

rename_count = rename_count - 1

556

if rename_count > 0:

557

name = server.GetAlternativeServiceName(name)

558

logger.warning(u"Service name collision, "

559

u"changing name to '%s' ...", name)

560

remove_service()

561

add_service()

562

563

else:

564

logger.error(u"No suitable service name found after %i"

565

u" retries, exiting.", n_rename)

566

killme(1)

596

567

elif state == avahi.ENTRY_GROUP_FAILURE:

597

logger.critical(u"Error in group state changed %s",

598

unicode(error))

599

raise AvahiGroupError("State changed: %s", str(error))

568

logger.error(u"Error in group state changed %s",

569

unicode(error))

570

killme(1)

571

600

572

601

573

def if_nametoindex(interface):

602

"""Call the C function if_nametoindex(), or equivalent"""

603

global if_nametoindex

574

"""Call the C function if_nametoindex()"""

604

575

try:

605

if "ctypes.util" not in sys.modules:

606

import ctypes.util

607

if_nametoindex = ctypes.cdll.LoadLibrary\

608

(ctypes.util.find_library("c")).if_nametoindex

576

libc = ctypes.cdll.LoadLibrary("libc.so.6")

577

return libc.if_nametoindex(interface)

609

578

except (OSError, AttributeError):

610

579

if "struct" not in sys.modules:

611

580

import struct

612

581

if "fcntl" not in sys.modules:

613

582

import fcntl

614

def if_nametoindex(interface):

615

"Get an interface index the hard way, i.e. using fcntl()"

616

SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

617

s = socket.socket()

618

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

619

struct.pack("16s16x", interface))

620

s.close()

621

interface_index = struct.unpack("I", ifreq[16:20])[0]

622

return interface_index

623

return if_nametoindex(interface)

624

625

626

def daemon(nochdir = False, noclose = False):

583

SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

584

s = socket.socket()

585

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

586

struct.pack("16s16x", interface))

587

s.close()

588

interface_index = struct.unpack("I", ifreq[16:20])[0]

589

return interface_index

590

591

592

def daemon(nochdir, noclose):

627

593

"""See daemon(3). Standard BSD Unix function.

628

594

This should really exist as os.daemon, but it doesn't (yet)."""

629

595

if os.fork():

631

597

os.setsid()

632

598

if not nochdir:

633

599

os.chdir("/")

634

if os.fork():

635

sys.exit()

636

600

if not noclose:

637

601

# Close all standard open file descriptors

638

null = os.open(os.path.devnull, os.O_NOCTTY | os.O_RDWR)

602

null = os.open("/dev/null", os.O_NOCTTY | os.O_RDWR)

639

603

if not stat.S_ISCHR(os.fstat(null).st_mode):

640

604

raise OSError(errno.ENODEV,

641

605

"/dev/null not a character device")

646

610

os.close(null)

647

611

648

612

613

def killme(status = 0):

614

logger.debug("Stopping server with exit status %d", status)

615

exitstatus = status

616

if main_loop_started:

617

main_loop.quit()

618

else:

619

sys.exit(status)

620

621

649

622

def main():

623

global exitstatus

624

exitstatus = 0

650

625

global main_loop_started

651

626

main_loop_started = False

652

627

653

628

parser = OptionParser()

654

629

parser.add_option("-i", "--interface", type="string",

655

metavar="IF", help="Bind to interface IF")

656

parser.add_option("-a", "--address", type="string",

630

default=None, metavar="IF",

631

help="Bind to interface IF")

632

parser.add_option("-a", "--address", type="string", default=None,

657

633

help="Address to listen for requests on")

658

parser.add_option("-p", "--port", type="int",

634

parser.add_option("-p", "--port", type="int", default=None,

659

635

help="Port number to receive requests on")

660

636

parser.add_option("--check", action="store_true", default=False,

661

637

help="Run self-test")

662

parser.add_option("--debug", action="store_true",

663

help="Debug mode; run in foreground and log to"

664

" terminal")

665

parser.add_option("--priority", type="string", help="GnuTLS"

666

" priority string (see GnuTLS documentation)")

667

parser.add_option("--servicename", type="string", metavar="NAME",

668

help="Zeroconf service name")

669

parser.add_option("--configdir", type="string",

670

default="/etc/mandos", metavar="DIR",

671

help="Directory to search for configuration"

672

" files")

638

parser.add_option("--debug", action="store_true", default=False,

639

help="Debug mode")

640

parser.add_option("--priority", type="string",

641

default="SECURE256",

642

help="GnuTLS priority string"

643

" (see GnuTLS documentation)")

644

parser.add_option("--servicename", type="string",

645

default="Mandos", help="Zeroconf service name")

673

646

(options, args) = parser.parse_args()

674

647

675

648

if options.check:

677

650

doctest.testmod()

678

651

sys.exit()

679

652

680

# Default values for config file for server-global settings

681

server_defaults = { "interface": "",

682

"address": "",

683

"port": "",

684

"debug": "False",

685

"priority":

686

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",

687

"servicename": "Mandos",

688

}

689

690

# Parse config file for server-global settings

691

server_config = ConfigParser.SafeConfigParser(server_defaults)

692

del server_defaults

693

server_config.read(os.path.join(options.configdir, "mandos.conf"))

694

server_section = "server"

695

# Convert the SafeConfigParser object to a dict

696

server_settings = dict(server_config.items(server_section))

697

# Use getboolean on the boolean config option

698

server_settings["debug"] = server_config.getboolean\

699

(server_section, "debug")

700

del server_config

701

702

# Override the settings from the config file with command line

703

# options, if set.

704

for option in ("interface", "address", "port", "debug",

705

"priority", "servicename", "configdir"):

706

value = getattr(options, option)

707

if value is not None:

708

server_settings[option] = value

709

del options

710

# Now we have our good server settings in "server_settings"

711

712

# Parse config file with clients

713

client_defaults = { "timeout": "1h",

714

"interval": "5m",

715

"checker": "fping -q -- %%(fqdn)s",

716

}

717

client_config = ConfigParser.SafeConfigParser(client_defaults)

718

client_config.read(os.path.join(server_settings["configdir"],

719

"clients.conf"))

720

721

global service

722

service = AvahiService(name = server_settings["servicename"],

723

type = "_mandos._tcp", );

724

if server_settings["interface"]:

725

service.interface = if_nametoindex(server_settings["interface"])

653

# Parse config file

654

defaults = { "timeout": "1h",

655

"interval": "5m",

656

"checker": "fping -q -- %%(fqdn)s",

657

}

658

client_config = ConfigParser.SafeConfigParser(defaults)

659

#client_config.readfp(open("global.conf"), "global.conf")

660

client_config.read("mandos-clients.conf")

661

662

global serviceName

663

serviceName = options.servicename;

726

664

727

665

global main_loop

728

666

global bus

736

674

avahi.DBUS_INTERFACE_SERVER )

737

675

# End of Avahi example code

738

676

739

debug = server_settings["debug"]

677

debug = options.debug

740

678

741

679

if debug:

742

680

console = logging.StreamHandler()

750

688

def remove_from_clients(client):

751

689

clients.remove(client)

752

690

if not clients:

753

logger.critical(u"No clients left, exiting")

754

sys.exit()

691

logger.debug(u"No clients left, exiting")

692

killme()

755

693

756

clients.update(Set(Client(name = section,

694

clients.update(Set(Client(name=section,

757

695

stop_hook = remove_from_clients,

758

config

759

= dict(client_config.items(section)))

696

**(dict(client_config\

697

.items(section))))

760

698

for section in client_config.sections()))

761

699

762

700

if not debug:

763

daemon()

701

daemon(False, False)

764

702

765

703

def cleanup():

766

704

"Cleanup function; run on exit"

780

718

781

719

if not debug:

782

720

signal.signal(signal.SIGINT, signal.SIG_IGN)

783

signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())

784

signal.signal(signal.SIGTERM, lambda signum, frame: sys.exit())

721

signal.signal(signal.SIGHUP, lambda signum, frame: killme())

722

signal.signal(signal.SIGTERM, lambda signum, frame: killme())

785

723

786

724

for client in clients:

787

725

client.start()

788

726

789

tcp_server = IPv6_TCPServer((server_settings["address"],

790

server_settings["port"]),

727

tcp_server = IPv6_TCPServer((options.address, options.port),

791

728

tcp_handler,

792

settings=server_settings,

729

options=options,

793

730

clients=clients)

794

# Find out what port we got

795

service.port = tcp_server.socket.getsockname()[1]

796

logger.info(u"Now listening on address %r, port %d, flowinfo %d,"

797

u" scope_id %d" % tcp_server.socket.getsockname())

798

799

#service.interface = tcp_server.socket.getsockname()[3]

800

801

try:

802

# From the Avahi example code

803

server.connect_to_signal("StateChanged", server_state_changed)

804

try:

805

server_state_changed(server.GetState())

806

except dbus.exceptions.DBusException, error:

807

logger.critical(u"DBusException: %s", error)

808

sys.exit(1)

809

# End of Avahi example code

810

811

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

812

lambda *args, **kwargs:

813

tcp_server.handle_request\

814

(*args[2:], **kwargs) or True)

815

731

# Find out what random port we got

732

global servicePort

733

servicePort = tcp_server.socket.getsockname()[1]

734

logger.debug(u"Now listening on port %d", servicePort)

735

736

if options.interface is not None:

737

global serviceInterface

738

serviceInterface = if_nametoindex(options.interface)

739

740

# From the Avahi example code

741

server.connect_to_signal("StateChanged", server_state_changed)

742

try:

743

server_state_changed(server.GetState())

744

except dbus.exceptions.DBusException, error:

745

logger.critical(u"DBusException: %s", error)

746

killme(1)

747

# End of Avahi example code

748

749

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

750

lambda *args, **kwargs:

751

tcp_server.handle_request(*args[2:],

752

**kwargs) or True)

753

try:

816

754

logger.debug("Starting main loop")

817

755

main_loop_started = True

818

756

main_loop.run()

819

except AvahiError, error:

820

logger.critical(u"AvahiError: %s" + unicode(error))

821

sys.exit(1)

822

757

except KeyboardInterrupt:

823

758

if debug:

824

759

print

760

761

sys.exit(exitstatus)

825

762

826

763

if __name__ == '__main__':

827

764

main()