/mandos/trunk : revision 275

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import ctypes

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import ctypes.util

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version = "1.0.6"

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version = "1.0.5"

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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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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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('Mandos: %(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 [%(process)d]:'

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' %(levelname)s: %(message)s'))

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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):

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"""

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

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servicetype = None, port = None, TXT = None,

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domain = "", host = "", max_renames = 32768,

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protocol = avahi.PROTO_UNSPEC):

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domain = "", host = "", max_renames = 32768):

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self.interface = interface

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self.name = name

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self.type = servicetype

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self.host = host

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self.rename_count = 0

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self.max_renames = max_renames

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self.protocol = protocol

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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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service.name, service.type)

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group.AddService(

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self.interface, # interface

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self.protocol, # protocol

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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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class Client(dbus.service.Object):

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"""A representation of a client host served by this server.

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Attributes:

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name: string; from the config file, used in log messages and

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D-Bus identifiers

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name: string; from the config file, used in log messages

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fingerprint: string (40 or 32 hexadecimal digits); used to

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uniquely identify the client

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

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client lives. %() 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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current_checker_command: string; current running checker_command

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use_dbus: bool(); Whether to provide D-Bus interface and signals

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dbus_object_path: dbus.ObjectPath ; only set if self.use_dbus

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"""

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if config is None:

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config = {}

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

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self.use_dbus = False # During __init__

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self.use_dbus = use_dbus

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if self.use_dbus:

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self.dbus_object_path = (dbus.ObjectPath

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("/Mandos/clients/"

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+ self.name.replace(".", "_")))

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dbus.service.Object.__init__(self, bus,

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self.dbus_object_path)

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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.disable_initiator_tag = None

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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self.current_checker_command = None

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self.last_connect = None

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# Only now, when this client is initialized, can it show up on

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# the D-Bus

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self.use_dbus = use_dbus

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if self.use_dbus:

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self.dbus_object_path = (dbus.ObjectPath

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("/clients/"

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+ self.name.replace(".", "_")))

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dbus.service.Object.__init__(self, bus,

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self.dbus_object_path)

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def enable(self):

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

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# Emit D-Bus signal

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self.PropertyChanged(dbus.String(u"checker_running"),

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dbus.Boolean(False, variant_level=1))

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if os.WIFEXITED(condition):

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exitstatus = os.WEXITSTATUS(condition)

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if exitstatus == 0:

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

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vars(self))

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self.checked_ok()

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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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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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if self.use_dbus:

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# Emit D-Bus signal

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self.CheckerCompleted(dbus.Int16(exitstatus),

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dbus.Int64(condition),

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self.CheckerCompleted(dbus.Boolean(True),

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dbus.UInt16(condition),

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dbus.String(command))

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else:

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self.bump_timeout()

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elif not os.WIFEXITED(condition):

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

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vars(self))

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if self.use_dbus:

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# Emit D-Bus signal

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self.CheckerCompleted(dbus.Int16(-1),

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dbus.Int64(condition),

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self.CheckerCompleted(dbus.Boolean(False),

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dbus.UInt16(condition),

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dbus.String(command))

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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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if self.use_dbus:

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# Emit D-Bus signal

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self.CheckerCompleted(dbus.Boolean(False),

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dbus.UInt16(condition),

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dbus.String(command))

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def checked_ok(self):

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def bump_timeout(self):

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"""Bump up the timeout for this client.

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This should only be called when the client has been seen,

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alive and well.

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# checkers alone, the checker would have to take more time

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# than 'timeout' for the client to be declared invalid, which

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# is as it should be.

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# If a checker exists, make sure it is not a zombie

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if self.checker is not None:

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pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

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if pid:

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logger.warning("Checker was a zombie")

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gobject.source_remove(self.checker_callback_tag)

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self.checker_callback(pid, status,

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self.current_checker_command)

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# Start a new checker if needed

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if self.checker is None:

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try:

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# In case checker_command has exactly one % operator

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

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

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return True # Try again later

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self.current_checker_command = command

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try:

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

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command, self.name)

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(self.checker.pid,

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self.checker_callback,

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data=command))

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# The checker may have completed before the gobject

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# watch was added. Check for this.

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pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

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if pid:

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gobject.source_remove(self.checker_callback_tag)

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self.checker_callback(pid, status, command)

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except OSError, error:

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logger.error(u"Failed to start subprocess: %s",

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error)

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

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## D-Bus methods & signals

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_interface = u"se.bsnet.fukt.Mandos.Client"

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_interface = u"org.mandos_system.Mandos.Client"

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# CheckedOK - method

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CheckedOK = dbus.service.method(_interface)(checked_ok)

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CheckedOK.__name__ = "CheckedOK"

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# BumpTimeout - method

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BumpTimeout = dbus.service.method(_interface)(bump_timeout)

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BumpTimeout.__name__ = "BumpTimeout"

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# CheckerCompleted - signal

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@dbus.service.signal(_interface, signature="nxs")

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def CheckerCompleted(self, exitcode, waitstatus, command):

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@dbus.service.signal(_interface, signature="bqs")

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def CheckerCompleted(self, success, condition, command):

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"D-Bus signal"

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pass

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dbus.String("checker_running"):

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dbus.Boolean(self.checker is not None,

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variant_level=1),

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dbus.String("object_path"):

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dbus.ObjectPath(self.dbus_object_path,

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variant_level=1)

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}, signature="sv")

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# IsStillValid - method

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!= gnutls.library.constants.GNUTLS_CRT_OPENPGP):

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# ...do the normal thing

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return session.peer_certificate

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list_size = ctypes.c_uint(1)

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list_size = ctypes.c_uint()

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cert_list = (gnutls.library.functions

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.gnutls_certificate_get_peers

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(session._c_object, ctypes.byref(list_size)))

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if not bool(cert_list) and list_size.value != 0:

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raise gnutls.errors.GNUTLSError("error getting peer"

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" certificate")

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if list_size.value == 0:

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return None

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cert = cert_list[0]

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# using OpenPGP certificates.

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

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

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# "+DHE-DSS"))

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

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# "+DHE-DSS"))

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# Use a fallback default, since this MUST be set.

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priority = self.server.settings.get("priority", "NORMAL")

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(gnutls.library.functions

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

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# established. Just abandon the request.

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return

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logger.debug(u"Handshake succeeded")

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try:

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fpr = fingerprint(peer_certificate(session))

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

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session.bye()

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return

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

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for c in self.server.clients:

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if c.fingerprint == fpr:

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client = c

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session.bye()

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return

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## This won't work here, since we're in a fork.

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# client.checked_ok()

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# client.bump_timeout()

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sent_size = 0

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while sent_size < len(client.secret):

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sent = session.send(client.secret[sent_size:])

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class IPv6_TCPServer(SocketServer.ForkingMixIn,

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SocketServer.TCPServer, object):

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

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

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Attributes:

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settings: Server settings

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clients: Set() of Client objects

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if "clients" in kwargs:

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self.clients = kwargs["clients"]

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del kwargs["clients"]

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if "use_ipv6" in kwargs:

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if not kwargs["use_ipv6"]:

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self.address_family = socket.AF_INET

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del kwargs["use_ipv6"]

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self.enabled = False

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super(IPv6_TCPServer, self).__init__(*args, **kwargs)

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def server_bind(self):

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u" bind to interface %s",

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self.settings["interface"])

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else:

793

raise

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raise error

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

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if self.server_address[0] or self.server_address[1]:

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if not self.server_address[0]:

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if self.address_family == socket.AF_INET6:

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any_address = "::" # in6addr_any

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else:

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any_address = socket.INADDR_ANY

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self.server_address = (any_address,

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in6addr_any = "::"

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self.server_address = (in6addr_any,

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self.server_address[1])

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elif not self.server_address[1]:

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

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821

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def string_to_delta(interval):

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"""Parse a string and return a datetime.timedelta

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785

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>>> string_to_delta('7d')

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787

datetime.timedelta(7)

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>>> string_to_delta('60s')

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913

dest="use_dbus",

952

914

help="Do not provide D-Bus system bus"

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915

" interface")

954

parser.add_option("--no-ipv6", action="store_false",

955

dest="use_ipv6", help="Do not use IPv6")

956

916

options = parser.parse_args()[0]

957

917

958

918

if options.check:

969

929

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

970

930

"servicename": "Mandos",

971

931

"use_dbus": "True",

972

"use_ipv6": "True",

973

932

}

974

933

975

934

# Parse config file for server-global settings

978

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

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# Convert the SafeConfigParser object to a dict

980

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server_settings = server_config.defaults()

981

# Use the appropriate methods on the non-string config options

982

server_settings["debug"] = server_config.getboolean("DEFAULT",

983

"debug")

984

server_settings["use_dbus"] = server_config.getboolean("DEFAULT",

985

"use_dbus")

986

server_settings["use_ipv6"] = server_config.getboolean("DEFAULT",

987

"use_ipv6")

988

if server_settings["port"]:

989

server_settings["port"] = server_config.getint("DEFAULT",

990

"port")

940

# Use getboolean on the boolean config options

941

server_settings["debug"] = (server_config.getboolean

942

("DEFAULT", "debug"))

943

server_settings["use_dbus"] = (server_config.getboolean

944

("DEFAULT", "use_dbus"))

991

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del server_config

992

946

993

947

# Override the settings from the config file with command line

994

948

# options, if set.

995

949

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

996

950

"priority", "servicename", "configdir",

997

"use_dbus", "use_ipv6"):

951

"use_dbus"):

998

952

value = getattr(options, option)

999

953

if value is not None:

1000

954

server_settings[option] = value

1004

958

# For convenience

1005

959

debug = server_settings["debug"]

1006

960

use_dbus = server_settings["use_dbus"]

1007

use_ipv6 = server_settings["use_ipv6"]

1008

961

1009

962

if not debug:

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963

syslogger.setLevel(logging.WARNING)

1031

984

server_settings["port"]),

1032

985

TCP_handler,

1033

986

settings=server_settings,

1034

clients=clients, use_ipv6=use_ipv6)

987

clients=clients)

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988

pidfilename = "/var/run/mandos.pid"

1036

989

try:

1037

990

pidfile = open(pidfilename, "w")

1038

except IOError:

991

except IOError, error:

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992

logger.error("Could not open file %r", pidfilename)

1040

993

1041

994

try:

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1006

uid = 65534

1054

1007

gid = 65534

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1008

try:

1009

os.setuid(uid)

1056

1010

os.setgid(gid)

1057

os.setuid(uid)

1058

1011

except OSError, error:

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1012

if error[0] != errno.EPERM:

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1013

raise error

1061

1014

1062

# Enable all possible GnuTLS debugging

1063

if debug:

1064

# "Use a log level over 10 to enable all debugging options."

1065

# - GnuTLS manual

1066

gnutls.library.functions.gnutls_global_set_log_level(11)

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@gnutls.library.types.gnutls_log_func

1069

def debug_gnutls(level, string):

1070

logger.debug("GnuTLS: %s", string[:-1])

1071

1072

(gnutls.library.functions

1073

.gnutls_global_set_log_function(debug_gnutls))

1074

1075

1015

global service

1076

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1077

1016

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

1078

servicetype = "_mandos._tcp",

1079

protocol = protocol)

1017

servicetype = "_mandos._tcp", )

1080

1018

if server_settings["interface"]:

1081

1019

service.interface = (if_nametoindex

1082

1020

(server_settings["interface"]))

1093

1031

avahi.DBUS_INTERFACE_SERVER)

1094

1032

# End of Avahi example code

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1033

if use_dbus:

1096

bus_name = dbus.service.BusName(u"se.bsnet.fukt.Mandos", bus)

1034

bus_name = dbus.service.BusName(u"org.mandos-system.Mandos",

1035

bus)

1097

1036

1098

1037

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

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1038

config

1153

1092

class MandosServer(dbus.service.Object):

1154

1093

"""A D-Bus proxy object"""

1155

1094

def __init__(self):

1156

dbus.service.Object.__init__(self, bus, "/")

1157

_interface = u"se.bsnet.fukt.Mandos"

1158

1095

dbus.service.Object.__init__(self, bus,

1096

"/Mandos")

1097

_interface = u"org.mandos_system.Mandos"

1098

1159

1099

@dbus.service.signal(_interface, signature="oa{sv}")

1160

1100

def ClientAdded(self, objpath, properties):

1161

1101

"D-Bus signal"

1162

1102

pass

1163

1164

@dbus.service.signal(_interface, signature="os")

1165

def ClientRemoved(self, objpath, name):

1103

1104

@dbus.service.signal(_interface, signature="o")

1105

def ClientRemoved(self, objpath):

1166

1106

"D-Bus signal"

1167

1107

pass

1168

1108

1169

1109

@dbus.service.method(_interface, out_signature="ao")

1170

1110

def GetAllClients(self):

1171

"D-Bus method"

1172

1111

return dbus.Array(c.dbus_object_path for c in clients)

1173

1112

1174

1113

@dbus.service.method(_interface, out_signature="a{oa{sv}}")

1175

1114

def GetAllClientsWithProperties(self):

1176

"D-Bus method"

1177

1115

return dbus.Dictionary(

1178

1116

((c.dbus_object_path, c.GetAllProperties())

1179

1117

for c in clients),

1180

1118

signature="oa{sv}")

1181

1119

1182

1120

@dbus.service.method(_interface, in_signature="o")

1183

1121

def RemoveClient(self, object_path):

1184

"D-Bus method"

1185

1122

for c in clients:

1186

1123

if c.dbus_object_path == object_path:

1187

1124

clients.remove(c)

1189

1126

c.use_dbus = False

1190

1127

c.disable()

1191

1128

# Emit D-Bus signal

1192

self.ClientRemoved(object_path, c.name)

1129

self.ClientRemoved(object_path)

1193

1130

return

1194

1131

raise KeyError

1195

1132

@dbus.service.method(_interface)

1133

def Quit(self):

1134

main_loop.quit()

1135

1196

1136

del _interface

1197

1137

1198

1138

mandos_server = MandosServer()

1199

1139

1200

1140

for client in clients:

1209

1149

1210

1150

# Find out what port we got

1211

1151

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

1212

if use_ipv6:

1213

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

1214

" flowinfo %d, scope_id %d"

1215

% tcp_server.socket.getsockname())

1216

else: # IPv4

1217

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

1218

% tcp_server.socket.getsockname())

1152

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

1153

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

1219

1154

1220

1155

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

1221

1156

1241

1176

sys.exit(1)

1242

1177

except KeyboardInterrupt:

1243

1178

if debug:

1244

print >> sys.stderr

1245

logger.debug("Server received KeyboardInterrupt")

1246

logger.debug("Server exiting")

1179

print

1247

1180

1248

1181

if __name__ == '__main__':

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1182

main()