/mandos/trunk : revision 518.2.3

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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SO_BINDTODEVICE = None

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version = "1.3.1"

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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logger = logging.getLogger()

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/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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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:'

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' %(message)s'))

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logger.addHandler(console)

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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

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.if_nametoindex)

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except (OSError, AttributeError):

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def if_nametoindex(interface):

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

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

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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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def initlogger(level=logging.WARNING):

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"""init logger and add loglevel"""

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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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logger.addHandler(syslogger)

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console = logging.StreamHandler()

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console.setFormatter(logging.Formatter('%(asctime)s %(name)s'

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' [%(process)d]:'

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' %(levelname)s:'

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' %(message)s'))

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logger.addHandler(console)

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logger.setLevel(level)

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class CryptoError(Exception):

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pass

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class Crypto(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet'])

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def __enter__(self):

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return self

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def __exit__ (self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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def __del__(self):

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self._cleanup()

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def _cleanup(self):

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if self.tempdir is not None:

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# Delete contents of tempdir

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for root, dirs, files in os.walk(self.tempdir,

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topdown = False):

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for filename in files:

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os.remove(os.path.join(root, filename))

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for dirname in dirs:

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os.rmdir(os.path.join(root, dirname))

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# Remove tempdir

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os.rmdir(self.tempdir)

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self.tempdir = None

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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return b"mandos" + binascii.hexlify(password)

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def encrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise CryptoError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull) as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin'] ) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise CryptoError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server.GetAlternativeServiceName(self.name))

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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logger.info("Changing Zeroconf service name to %r ...",

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self.name)

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syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

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self.remove()

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try:

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self.add()

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avahi.DBUS_INTERFACE_ENTRY_GROUP)

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self.entry_group_state_changed_match = (

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self.group.connect_to_signal(

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'StateChanged', self .entry_group_state_changed))

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'StateChanged', self.entry_group_state_changed))

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

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self.name, self.type)

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self.group.AddService(

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try:

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self.group.Free()

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except (dbus.exceptions.UnknownMethodException,

227

dbus.exceptions.DBusException) as e:

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dbus.exceptions.DBusException):

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pass

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self.group = None

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self.remove()

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self.server_state_changed)

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self.server_state_changed(self.server.GetState())

266

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

374

syslogger.setFormatter(logging.Formatter

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

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

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% self.name))

378

return ret

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def _timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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400

instance %(name)s can be used in the command.

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401

checker_initiator_tag: a gobject event source tag, or None

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created: datetime.datetime(); (UTC) object creation

403

client_structure: Object describing what attributes a client has

404

and is used for storing the client at exit

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current_checker_command: string; current running checker_command

292

disable_hook: If set, called by disable() as disable_hook(self)

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disable_initiator_tag: a gobject event source tag, or None

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enabled: bool()

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

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interval: datetime.timedelta(); How often to start a new checker

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last_approval_request: datetime.datetime(); (UTC) or None

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last_checked_ok: datetime.datetime(); (UTC) or None

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last_enabled: datetime.datetime(); (UTC)

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last_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflects crashed

417

checker, or None.

418

last_enabled: datetime.datetime(); (UTC) or None

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

321

438

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

324

return _timedelta_to_milliseconds(self.extended_timeout)

441

return _timedelta_to_milliseconds(self.extended_timeout)

325

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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def approval_delay_milliseconds(self):

331

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return _timedelta_to_milliseconds(self.approval_delay)

332

449

333

def __init__(self, name = None, disable_hook=None, config=None):

450

def __init__(self, name = None, config=None):

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451

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

335

452

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

336

453

attribute."""

356

473

% self.name)

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

358

475

self.created = datetime.datetime.utcnow()

359

self.enabled = False

476

self.enabled = config.get("enabled", True)

360

477

self.last_approval_request = None

361

self.last_enabled = None

478

if self.enabled:

479

self.last_enabled = datetime.datetime.utcnow()

480

else:

481

self.last_enabled = None

362

482

self.last_checked_ok = None

483

self.last_checker_status = None

363

484

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

364

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

485

self.extended_timeout = string_to_delta(config

486

["extended_timeout"])

365

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

366

self.disable_hook = disable_hook

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self.checker = None

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self.checker_initiator_tag = None

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self.disable_initiator_tag = None

370

self.expires = None

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if self.enabled:

492

self.expires = datetime.datetime.utcnow() + self.timeout

493

else:

494

self.expires = None

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495

self.checker_callback_tag = None

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496

self.checker_command = config["checker"]

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self.current_checker_command = None

374

self.last_connect = None

375

498

self._approved = None

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499

self.approved_by_default = config.get("approved_by_default",

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500

True)

380

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config["approval_delay"])

381

504

self.approval_duration = string_to_delta(

382

505

config["approval_duration"])

383

self.changedstate = multiprocessing_manager.Condition(multiprocessing_manager.Lock())

506

self.changedstate = (multiprocessing_manager

507

.Condition(multiprocessing_manager

508

.Lock()))

509

self.client_structure = [attr for attr in

510

self.__dict__.iterkeys()

511

if not attr.startswith("_")]

512

self.client_structure.append("client_structure")

513

514

for name, t in inspect.getmembers(type(self),

515

lambda obj:

516

isinstance(obj,

517

property)):

518

if not name.startswith("_"):

519

self.client_structure.append(name)

384

520

521

# Send notice to process children that client state has changed

385

522

def send_changedstate(self):

386

self.changedstate.acquire()

387

self.changedstate.notify_all()

388

self.changedstate.release()

389

523

with self.changedstate:

524

self.changedstate.notify_all()

525

390

526

def enable(self):

391

527

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

392

528

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

393

529

# Already enabled

394

530

return

395

531

self.send_changedstate()

396

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

397

# and every interval from then on.

398

self.checker_initiator_tag = (gobject.timeout_add

399

(self.interval_milliseconds(),

400

self.start_checker))

401

# Schedule a disable() when 'timeout' has passed

402

532

self.expires = datetime.datetime.utcnow() + self.timeout

403

self.disable_initiator_tag = (gobject.timeout_add

404

(self.timeout_milliseconds(),

405

self.disable))

406

533

self.enabled = True

407

534

self.last_enabled = datetime.datetime.utcnow()

408

# Also start a new checker *right now*.

409

self.start_checker()

535

self.init_checker()

410

536

411

537

def disable(self, quiet=True):

412

538

"""Disable this client."""

424

550

gobject.source_remove(self.checker_initiator_tag)

425

551

self.checker_initiator_tag = None

426

552

self.stop_checker()

427

if self.disable_hook:

428

self.disable_hook(self)

429

553

self.enabled = False

430

554

# Do not run this again if called by a gobject.timeout_add

431

555

return False

432

556

433

557

def __del__(self):

434

self.disable_hook = None

435

558

self.disable()

436

559

560

def init_checker(self):

561

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

562

# and every interval from then on.

563

self.checker_initiator_tag = (gobject.timeout_add

564

(self.interval_milliseconds(),

565

self.start_checker))

566

# Schedule a disable() when 'timeout' has passed

567

self.disable_initiator_tag = (gobject.timeout_add

568

(self.timeout_milliseconds(),

569

self.disable))

570

# Also start a new checker *right now*.

571

self.start_checker()

572

437

573

def checker_callback(self, pid, condition, command):

438

574

"""The checker has completed, so take appropriate actions."""

439

575

self.checker_callback_tag = None

440

576

self.checker = None

441

577

if os.WIFEXITED(condition):

442

exitstatus = os.WEXITSTATUS(condition)

443

if exitstatus == 0:

578

self.last_checker_status = os.WEXITSTATUS(condition)

579

if self.last_checker_status == 0:

444

580

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

445

581

vars(self))

446

582

self.checked_ok()

448

584

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

449

585

vars(self))

450

586

else:

587

self.last_checker_status = -1

451

588

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

452

589

vars(self))

453

590

460

597

if timeout is None:

461

598

timeout = self.timeout

462

599

self.last_checked_ok = datetime.datetime.utcnow()

463

gobject.source_remove(self.disable_initiator_tag)

464

self.expires = datetime.datetime.utcnow() + timeout

465

self.disable_initiator_tag = (gobject.timeout_add

466

(_timedelta_to_milliseconds(timeout),

467

self.disable))

600

if self.disable_initiator_tag is not None:

601

gobject.source_remove(self.disable_initiator_tag)

602

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

603

self.disable_initiator_tag = (gobject.timeout_add

604

(_timedelta_to_milliseconds

605

(timeout), self.disable))

606

self.expires = datetime.datetime.utcnow() + timeout

468

607

469

608

def need_approval(self):

470

609

self.last_approval_request = datetime.datetime.utcnow()

629

768

"""

630

769

return ((prop.__get__(self)._dbus_name, prop.__get__(self))

631

770

for cls in self.__class__.__mro__

632

for name, prop in inspect.getmembers(cls, self._is_dbus_property))

771

for name, prop in

772

inspect.getmembers(cls, self._is_dbus_property))

633

773

634

774

def _get_dbus_property(self, interface_name, property_name):

635

775

"""Returns a bound method if one exists which is a D-Bus

636

776

property with the specified name and interface.

637

777

"""

638

778

for cls in self.__class__.__mro__:

639

for name, value in inspect.getmembers(cls, self._is_dbus_property):

640

if value._dbus_name == property_name and value._dbus_interface == interface_name:

779

for name, value in (inspect.getmembers

780

(cls, self._is_dbus_property)):

781

if (value._dbus_name == property_name

782

and value._dbus_interface == interface_name):

641

783

return value.__get__(self)

642

784

643

785

# No such property

682

824

683

825

Note: Will not include properties with access="write".

684

826

"""

685

all = {}

827

properties = {}

686

828

for name, prop in self._get_all_dbus_properties():

687

829

if (interface_name

688

830

and interface_name != prop._dbus_interface):

693

835

continue

694

836

value = prop()

695

837

if not hasattr(value, "variant_level"):

696

all[name] = value

838

properties[name] = value

697

839

continue

698

all[name] = type(value)(value, variant_level=

699

value.variant_level+1)

700

return dbus.Dictionary(all, signature="sv")

840

properties[name] = type(value)(value, variant_level=

841

value.variant_level+1)

842

return dbus.Dictionary(properties, signature="sv")

701

843

702

844

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

703

845

out_signature="s",

754

896

return dbus.String(dt.isoformat(),

755

897

variant_level=variant_level)

756

898

757

class AlternateDBusNamesMetaclass(DBusObjectWithProperties.__metaclass__):

899

900

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

901

.__metaclass__):

758

902

"""Applied to an empty subclass of a D-Bus object, this metaclass

759

903

will add additional D-Bus attributes matching a certain pattern.

760

904

"""

850

994

attribute.func_closure)))

851

995

return type.__new__(mcs, name, bases, attr)

852

996

997

853

998

class ClientDBus(Client, DBusObjectWithProperties):

854

999

"""A Client class using D-Bus

855

1000

864

1009

# dbus.service.Object doesn't use super(), so we can't either.

865

1010

866

1011

def __init__(self, bus = None, *args, **kwargs):

1012

self.bus = bus

1013

Client.__init__(self, *args, **kwargs)

1014

867

1015

self._approvals_pending = 0

868

self.bus = bus

869

Client.__init__(self, *args, **kwargs)

870

1016

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

871

1017

# the D-Bus

872

1018

client_object_name = unicode(self.name).translate(

882

1028

variant_level=1):

883

1029

""" Modify a variable so that it's a property which announces

884

1030

its changes to DBus.

885

886

transform_fun: Function that takes a value and transforms it

887

to a D-Bus type.

1031

1032

transform_fun: Function that takes a value and a variant_level

1033

and transforms it to a D-Bus type.

888

1034

dbus_name: D-Bus name of the variable

889

1035

type_func: Function that transform the value before sending it

890

1036

to the D-Bus. Default: no transform

891

1037

variant_level: D-Bus variant level. Default: 1

892

1038

"""

893

real_value = [None,]

1039

attrname = "_{0}".format(dbus_name)

894

1040

def setter(self, value):

895

old_value = real_value[0]

896

real_value[0] = value

897

1041

if hasattr(self, "dbus_object_path"):

898

if type_func(old_value) != type_func(real_value[0]):

899

dbus_value = transform_func(type_func(real_value[0]),

900

variant_level)

1042

if (not hasattr(self, attrname) or

1043

type_func(getattr(self, attrname, None))

1044

!= type_func(value)):

1045

dbus_value = transform_func(type_func(value),

1046

variant_level

1047

=variant_level)

901

1048

self.PropertyChanged(dbus.String(dbus_name),

902

1049

dbus_value)

1050

setattr(self, attrname, value)

903

1051

904

return property(lambda self: real_value[0], setter)

1052

return property(lambda self: getattr(self, attrname), setter)

905

1053

906

1054

907

1055

expires = notifychangeproperty(datetime_to_dbus, "Expires")

912

1060

last_enabled = notifychangeproperty(datetime_to_dbus,

913

1061

"LastEnabled")

914

1062

checker = notifychangeproperty(dbus.Boolean, "CheckerRunning",

915

type_func = lambda checker: checker is not None)

1063

type_func = lambda checker:

1064

checker is not None)

916

1065

last_checked_ok = notifychangeproperty(datetime_to_dbus,

917

1066

"LastCheckedOK")

918

last_approval_request = notifychangeproperty(datetime_to_dbus,

919

"LastApprovalRequest")

1067

last_approval_request = notifychangeproperty(

1068

datetime_to_dbus, "LastApprovalRequest")

920

1069

approved_by_default = notifychangeproperty(dbus.Boolean,

921

1070

"ApprovedByDefault")

922

approval_delay = notifychangeproperty(dbus.UInt16, "ApprovalDelay",

923

type_func = _timedelta_to_milliseconds)

924

approval_duration = notifychangeproperty(dbus.UInt16, "ApprovalDuration",

925

type_func = _timedelta_to_milliseconds)

1071

approval_delay = notifychangeproperty(dbus.UInt16,

1072

"ApprovalDelay",

1073

type_func =

1074

_timedelta_to_milliseconds)

1075

approval_duration = notifychangeproperty(

1076

dbus.UInt16, "ApprovalDuration",

1077

type_func = _timedelta_to_milliseconds)

926

1078

host = notifychangeproperty(dbus.String, "Host")

927

1079

timeout = notifychangeproperty(dbus.UInt16, "Timeout",

928

type_func = _timedelta_to_milliseconds)

929

extended_timeout = notifychangeproperty(dbus.UInt16, "ExtendedTimeout",

930

type_func = _timedelta_to_milliseconds)

931

interval = notifychangeproperty(dbus.UInt16, "Interval",

932

type_func = _timedelta_to_milliseconds)

1080

type_func =

1081

_timedelta_to_milliseconds)

1082

extended_timeout = notifychangeproperty(

1083

dbus.UInt16, "ExtendedTimeout",

1084

type_func = _timedelta_to_milliseconds)

1085

interval = notifychangeproperty(dbus.UInt16,

1086

"Interval",

1087

type_func =

1088

_timedelta_to_milliseconds)

933

1089

checker_command = notifychangeproperty(dbus.String, "Checker")

934

1090

935

1091

del notifychangeproperty

1032

1188

"D-Bus signal"

1033

1189

return self.need_approval()

1034

1190

1191

# NeRwequest - signal

1192

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

1193

def NewRequest(self, ip):

1194

"""D-Bus signal

1195

Is sent after a client request a password.

1196

"""

1197

pass

1198

1035

1199

## Methods

1036

1200

1037

1201

# Approve - method

1120

1284

# Created - property

1121

1285

@dbus_service_property(_interface, signature="s", access="read")

1122

1286

def Created_dbus_property(self):

1123

return dbus.String(datetime_to_dbus(self.created))

1287

return datetime_to_dbus(self.created)

1124

1288

1125

1289

# LastEnabled - property

1126

1290

@dbus_service_property(_interface, signature="s", access="read")

1170

1334

gobject.source_remove(self.disable_initiator_tag)

1171

1335

self.disable_initiator_tag = None

1172

1336

self.expires = None

1173

time_to_die = (self.

1174

_timedelta_to_milliseconds((self

1175

.last_checked_ok

1176

+ self.timeout)

1177

- datetime.datetime

1178

.utcnow()))

1337

time_to_die = _timedelta_to_milliseconds((self

1338

.last_checked_ok

1339

+ self.timeout)

1340

- datetime.datetime

1341

.utcnow())

1179

1342

if time_to_die <= 0:

1180

1343

# The timeout has passed

1181

1344

self.disable()

1182

1345

else:

1183

1346

self.expires = (datetime.datetime.utcnow()

1184

+ datetime.timedelta(milliseconds = time_to_die))

1347

+ datetime.timedelta(milliseconds =

1348

time_to_die))

1185

1349

self.disable_initiator_tag = (gobject.timeout_add

1186

1350

(time_to_die, self.disable))

1187

1351

1202

1366

self.interval = datetime.timedelta(0, 0, 0, value)

1203

1367

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

1204

1368

return

1205

# Reschedule checker run

1206

gobject.source_remove(self.checker_initiator_tag)

1207

self.checker_initiator_tag = (gobject.timeout_add

1208

(value, self.start_checker))

1209

self.start_checker() # Start one now, too

1369

if self.enabled:

1370

# Reschedule checker run

1371

gobject.source_remove(self.checker_initiator_tag)

1372

self.checker_initiator_tag = (gobject.timeout_add

1373

(value, self.start_checker))

1374

self.start_checker() # Start one now, too

1210

1375

1211

1376

# Checker - property

1212

1377

@dbus_service_property(_interface, signature="s",

1266

1431

return super(ProxyClient, self).__setattr__(name, value)

1267

1432

self._pipe.send(('setattr', name, value))

1268

1433

1434

1269

1435

class ClientDBusTransitional(ClientDBus):

1270

1436

__metaclass__ = AlternateDBusNamesMetaclass

1271

1437

1438

1272

1439

class ClientHandler(socketserver.BaseRequestHandler, object):

1273

1440

"""A class to handle client connections.

1274

1441

1335

1502

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

1336

1503

return

1337

1504

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

1505

if self.server.use_dbus:

1506

# Emit D-Bus signal

1507

client.NewRequest(str(self.client_address))

1338

1508

1339

1509

try:

1340

1510

client = ProxyClient(child_pipe, fpr,

1353

1523

client.name)

1354

1524

if self.server.use_dbus:

1355

1525

# Emit D-Bus signal

1356

client.Rejected("Disabled")

1526

client.Rejected("Disabled")

1357

1527

return

1358

1528

1359

1529

if client._approved or not client.approval_delay:

1376

1546

return

1377

1547

1378

1548

#wait until timeout or approved

1379

#x = float(client._timedelta_to_milliseconds(delay))

1380

1549

time = datetime.datetime.now()

1381

1550

client.changedstate.acquire()

1382

client.changedstate.wait(float(client._timedelta_to_milliseconds(delay) / 1000))

1551

(client.changedstate.wait

1552

(float(client._timedelta_to_milliseconds(delay)

1553

/ 1000)))

1383

1554

client.changedstate.release()

1384

1555

time2 = datetime.datetime.now()

1385

1556

if (time2 - time) >= delay:

1409

1580

sent_size += sent

1410

1581

1411

1582

logger.info("Sending secret to %s", client.name)

1412

# bump the timeout as if seen

1583

# bump the timeout using extended_timeout

1413

1584

client.checked_ok(client.extended_timeout)

1414

1585

if self.server.use_dbus:

1415

1586

# Emit D-Bus signal

1483

1654

# Convert the buffer to a Python bytestring

1484

1655

fpr = ctypes.string_at(buf, buf_len.value)

1485

1656

# Convert the bytestring to hexadecimal notation

1486

hex_fpr = ''.join("%02X" % ord(char) for char in fpr)

1657

hex_fpr = binascii.hexlify(fpr).upper()

1487

1658

return hex_fpr

1488

1659

1489

1660

1495

1666

except:

1496

1667

self.handle_error(request, address)

1497

1668

self.close_request(request)

1498

1669

1499

1670

def process_request(self, request, address):

1500

1671

"""Start a new process to process the request."""

1501

multiprocessing.Process(target = self.sub_process_main,

1502

args = (request, address)).start()

1672

proc = multiprocessing.Process(target = self.sub_process_main,

1673

args = (request,

1674

address))

1675

proc.start()

1676

return proc

1503

1677

1504

1678

1505

1679

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1511

1685

"""

1512

1686

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1513

1687

1514

super(MultiprocessingMixInWithPipe,

1515

self).process_request(request, client_address)

1688

proc = MultiprocessingMixIn.process_request(self, request,

1689

client_address)

1516

1690

self.child_pipe.close()

1517

self.add_pipe(parent_pipe)

1691

self.add_pipe(parent_pipe, proc)

1518

1692

1519

def add_pipe(self, parent_pipe):

1693

def add_pipe(self, parent_pipe, proc):

1520

1694

"""Dummy function; override as necessary"""

1521

1695

raise NotImplementedError

1522

1696

1600

1774

self.enabled = False

1601

1775

self.clients = clients

1602

1776

if self.clients is None:

1603

self.clients = set()

1777

self.clients = {}

1604

1778

self.use_dbus = use_dbus

1605

1779

self.gnutls_priority = gnutls_priority

1606

1780

IPv6_TCPServer.__init__(self, server_address,

1610

1784

def server_activate(self):

1611

1785

if self.enabled:

1612

1786

return socketserver.TCPServer.server_activate(self)

1787

1613

1788

def enable(self):

1614

1789

self.enabled = True

1615

def add_pipe(self, parent_pipe):

1790

1791

def add_pipe(self, parent_pipe, proc):

1616

1792

# Call "handle_ipc" for both data and EOF events

1617

1793

gobject.io_add_watch(parent_pipe.fileno(),

1618

1794

gobject.IO_IN | gobject.IO_HUP,

1619

1795

functools.partial(self.handle_ipc,

1620

parent_pipe = parent_pipe))

1621

1796

parent_pipe =

1797

parent_pipe,

1798

proc = proc))

1799

1622

1800

def handle_ipc(self, source, condition, parent_pipe=None,

1623

client_object=None):

1801

proc = None, client_object=None):

1624

1802

condition_names = {

1625

1803

gobject.IO_IN: "IN", # There is data to read.

1626

1804

gobject.IO_OUT: "OUT", # Data can be written (without

1635

1813

for cond, name in

1636

1814

condition_names.iteritems()

1637

1815

if cond & condition)

1638

# error or the other end of multiprocessing.Pipe has closed

1816

# error, or the other end of multiprocessing.Pipe has closed

1639

1817

if condition & (gobject.IO_ERR | condition & gobject.IO_HUP):

1818

# Wait for other process to exit

1819

proc.join()

1640

1820

return False

1641

1821

1642

1822

# Read a request from the child

1647

1827

fpr = request[1]

1648

1828

address = request[2]

1649

1829

1650

for c in self.clients:

1830

for c in self.clients.itervalues():

1651

1831

if c.fingerprint == fpr:

1652

1832

client = c

1653

1833

break

1656

1836

"dress: %s", fpr, address)

1657

1837

if self.use_dbus:

1658

1838

# Emit D-Bus signal

1659

mandos_dbus_service.ClientNotFound(fpr, address[0])

1839

mandos_dbus_service.ClientNotFound(fpr,

1840

address[0])

1660

1841

parent_pipe.send(False)

1661

1842

return False

1662

1843

1663

1844

gobject.io_add_watch(parent_pipe.fileno(),

1664

1845

gobject.IO_IN | gobject.IO_HUP,

1665

1846

functools.partial(self.handle_ipc,

1666

parent_pipe = parent_pipe,

1667

client_object = client))

1847

parent_pipe =

1848

parent_pipe,

1849

proc = proc,

1850

client_object =

1851

client))

1668

1852

parent_pipe.send(True)

1669

# remove the old hook in favor of the new above hook on same fileno

1853

# remove the old hook in favor of the new above hook on

1854

# same fileno

1670

1855

return False

1671

1856

if command == 'funcall':

1672

1857

funcname = request[1]

1673

1858

args = request[2]

1674

1859

kwargs = request[3]

1675

1860

1676

parent_pipe.send(('data', getattr(client_object, funcname)(*args, **kwargs)))

1861

parent_pipe.send(('data', getattr(client_object,

1862

funcname)(*args,

1863

**kwargs)))

1677

1864

1678

1865

if command == 'getattr':

1679

1866

attrname = request[1]

1680

1867

if callable(client_object.__getattribute__(attrname)):

1681

1868

parent_pipe.send(('function',))

1682

1869

else:

1683

parent_pipe.send(('data', client_object.__getattribute__(attrname)))

1870

parent_pipe.send(('data', client_object

1871

.__getattribute__(attrname)))

1684

1872

1685

1873

if command == 'setattr':

1686

1874

attrname = request[1]

1729

1917

return timevalue

1730

1918

1731

1919

1732

def if_nametoindex(interface):

1733

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

1734

1735

Note: This function cannot accept a unicode string."""

1736

global if_nametoindex

1737

try:

1738

if_nametoindex = (ctypes.cdll.LoadLibrary

1739

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

1740

.if_nametoindex)

1741

except (OSError, AttributeError):

1742

logger.warning("Doing if_nametoindex the hard way")

1743

def if_nametoindex(interface):

1744

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

1745

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

1746

with contextlib.closing(socket.socket()) as s:

1747

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1748

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

1749

interface))

1750

interface_index = struct.unpack(str("I"),

1751

ifreq[16:20])[0]

1752

return interface_index

1753

return if_nametoindex(interface)

1754

1755

1756

1920

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

1757

1921

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

1758

1922

1813

1977

" system bus interface")

1814

1978

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

1815

1979

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

1980

parser.add_argument("--no-restore", action="store_false",

1981

dest="restore", help="Do not restore stored"

1982

" state")

1983

parser.add_argument("--statedir", metavar="DIR",

1984

help="Directory to save/restore state in")

1985

1816

1986

options = parser.parse_args()

1817

1987

1818

1988

if options.check:

1831

2001

"use_dbus": "True",

1832

2002

"use_ipv6": "True",

1833

2003

"debuglevel": "",

2004

"restore": "True",

2005

"statedir": "/var/lib/mandos"

1834

2006

}

1835

2007

1836

2008

# Parse config file for server-global settings

1853

2025

# options, if set.

1854

2026

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

1855

2027

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

1856

"use_dbus", "use_ipv6", "debuglevel"):

2028

"use_dbus", "use_ipv6", "debuglevel", "restore",

2029

"statedir"):

1857

2030

value = getattr(options, option)

1858

2031

if value is not None:

1859

2032

server_settings[option] = value

1871

2044

debuglevel = server_settings["debuglevel"]

1872

2045

use_dbus = server_settings["use_dbus"]

1873

2046

use_ipv6 = server_settings["use_ipv6"]

2047

stored_state_path = os.path.join(server_settings["statedir"],

2048

stored_state_file)

2049

2050

if debug:

2051

initlogger(logging.DEBUG)

2052

else:

2053

if not debuglevel:

2054

initlogger()

2055

else:

2056

level = getattr(logging, debuglevel.upper())

2057

initlogger(level)

1874

2058

1875

2059

if server_settings["servicename"] != "Mandos":

1876

2060

syslogger.setFormatter(logging.Formatter

1931

2115

if error[0] != errno.EPERM:

1932

2116

raise error

1933

2117

1934

if not debug and not debuglevel:

1935

syslogger.setLevel(logging.WARNING)

1936

console.setLevel(logging.WARNING)

1937

if debuglevel:

1938

level = getattr(logging, debuglevel.upper())

1939

syslogger.setLevel(level)

1940

console.setLevel(level)

1941

1942

2118

if debug:

1943

2119

# Enable all possible GnuTLS debugging

1944

2120

1977

2153

try:

1978

2154

bus_name = dbus.service.BusName("se.recompile.Mandos",

1979

2155

bus, do_not_queue=True)

1980

old_bus_name = dbus.service.BusName("se.bsnet.fukt.Mandos",

1981

bus, do_not_queue=True)

2156

old_bus_name = (dbus.service.BusName

2157

("se.bsnet.fukt.Mandos", bus,

2158

do_not_queue=True))

1982

2159

except dbus.exceptions.NameExistsException as e:

1983

2160

logger.error(unicode(e) + ", disabling D-Bus")

1984

2161

use_dbus = False

1985

2162

server_settings["use_dbus"] = False

1986

2163

tcp_server.use_dbus = False

1987

2164

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

1988

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

1989

servicetype = "_mandos._tcp",

1990

protocol = protocol, bus = bus)

2165

service = AvahiServiceToSyslog(name =

2166

server_settings["servicename"],

2167

servicetype = "_mandos._tcp",

2168

protocol = protocol, bus = bus)

1991

2169

if server_settings["interface"]:

1992

2170

service.interface = (if_nametoindex

1993

2171

(str(server_settings["interface"])))

1997

2175

1998

2176

client_class = Client

1999

2177

if use_dbus:

2000

client_class = functools.partial(ClientDBusTransitional, bus = bus)

2001

def client_config_items(config, section):

2002

special_settings = {

2003

"approved_by_default":

2004

lambda: config.getboolean(section,

2005

"approved_by_default"),

2006

}

2007

for name, value in config.items(section):

2178

client_class = functools.partial(ClientDBusTransitional,

2179

bus = bus)

2180

2181

special_settings = {

2182

# Some settings need to be accessd by special methods;

2183

# booleans need .getboolean(), etc. Here is a list of them:

2184

"approved_by_default":

2185

lambda section:

2186

client_config.getboolean(section, "approved_by_default"),

2187

"enabled":

2188

lambda section:

2189

client_config.getboolean(section, "enabled"),

2190

}

2191

# Construct a new dict of client settings of this form:

2192

# { client_name: {setting_name: value, ...}, ...}

2193

# with exceptions for any special settings as defined above

2194

client_settings = dict((clientname,

2195

dict((setting,

2196

(value

2197

if setting not in special_settings

2198

else special_settings[setting]

2199

(clientname)))

2200

for setting, value in

2201

client_config.items(clientname)))

2202

for clientname in client_config.sections())

2203

2204

old_client_settings = {}

2205

clients_data = []

2206

2207

# Get client data and settings from last running state.

2208

if server_settings["restore"]:

2209

try:

2210

with open(stored_state_path, "rb") as stored_state:

2211

clients_data, old_client_settings = (pickle.load

2212

(stored_state))

2213

os.remove(stored_state_path)

2214

except IOError as e:

2215

logger.warning("Could not load persistent state: {0}"

2216

.format(e))

2217

if e.errno != errno.ENOENT:

2218

raise

2219

2220

with Crypto() as crypt:

2221

for client in clients_data:

2222

client_name = client["name"]

2223

2224

# Decide which value to use after restoring saved state.

2225

# We have three different values: Old config file,

2226

# new config file, and saved state.

2227

# New config value takes precedence if it differs from old

2228

# config value, otherwise use saved state.

2229

for name, value in client_settings[client_name].items():

2230

try:

2231

# For each value in new config, check if it

2232

# differs from the old config value (Except for

2233

# the "secret" attribute)

2234

if (name != "secret" and

2235

value != old_client_settings[client_name]

2236

[name]):

2237

setattr(client, name, value)

2238

except KeyError:

2239

pass

2240

2241

# Clients who has passed its expire date can still be

2242

# enabled if its last checker was sucessful. Clients

2243

# whose checker failed before we stored its state is

2244

# assumed to have failed all checkers during downtime.

2245

if client["enabled"] and client["last_checked_ok"]:

2246

if ((datetime.datetime.utcnow()

2247

- client["last_checked_ok"])

2248

> client["interval"]):

2249

if client["last_checker_status"] != 0:

2250

client["enabled"] = False

2251

else:

2252

client["expires"] = (datetime.datetime

2253

.utcnow()

2254

+ client["timeout"])

2255

2256

client["changedstate"] = (multiprocessing_manager

2257

.Condition

2258

(multiprocessing_manager

2259

.Lock()))

2260

if use_dbus:

2261

new_client = (ClientDBusTransitional.__new__

2262

(ClientDBusTransitional))

2263

tcp_server.clients[client_name] = new_client

2264

new_client.bus = bus

2265

for name, value in client.iteritems():

2266

setattr(new_client, name, value)

2267

client_object_name = unicode(client_name).translate(

2268

{ord("."): ord("_"),

2269

ord("-"): ord("_")})

2270

new_client.dbus_object_path = (dbus.ObjectPath

2271

("/clients/"

2272

+ client_object_name))

2273

DBusObjectWithProperties.__init__(new_client,

2274

new_client.bus,

2275

new_client

2276

.dbus_object_path)

2277

else:

2278

tcp_server.clients[client_name] = (Client.__new__

2279

(Client))

2280

for name, value in client.iteritems():

2281

setattr(tcp_server.clients[client_name],

2282

name, value)

2283

2008

2284

try:

2009

yield (name, special_settings[name]())

2010

except KeyError:

2011

yield (name, value)

2012

2013

tcp_server.clients.update(set(

2014

client_class(name = section,

2015

config= dict(client_config_items(

2016

client_config, section)))

2017

for section in client_config.sections()))

2285

tcp_server.clients[client_name].secret = (

2286

crypt.decrypt(tcp_server.clients[client_name]

2287

.encrypted_secret,

2288

client_settings[client_name]

2289

["secret"]))

2290

except CryptoError:

2291

# If decryption fails, we use secret from new settings

2292

tcp_server.clients[client_name].secret = (

2293

client_settings[client_name]["secret"])

2294

2295

# Create/remove clients based on new changes made to config

2296

for clientname in set(old_client_settings) - set(client_settings):

2297

del tcp_server.clients[clientname]

2298

for clientname in set(client_settings) - set(old_client_settings):

2299

tcp_server.clients[clientname] = (client_class(name

2300

= clientname,

2301

config =

2302

client_settings

2303

[clientname]))

2304

2018

2305

if not tcp_server.clients:

2019

2306

logger.warning("No clients defined")

2020

2307

2063

2350

def GetAllClients(self):

2064

2351

"D-Bus method"

2065

2352

return dbus.Array(c.dbus_object_path

2066

for c in tcp_server.clients)

2353

for c in

2354

tcp_server.clients.itervalues())

2067

2355

2068

2356

@dbus.service.method(_interface,

2069

2357

out_signature="a{oa{sv}}")

2071

2359

"D-Bus method"

2072

2360

return dbus.Dictionary(

2073

2361

((c.dbus_object_path, c.GetAll(""))

2074

for c in tcp_server.clients),

2362

for c in tcp_server.clients.itervalues()),

2075

2363

signature="oa{sv}")

2076

2364

2077

2365

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

2078

2366

def RemoveClient(self, object_path):

2079

2367

"D-Bus method"

2080

for c in tcp_server.clients:

2368

for c in tcp_server.clients.itervalues():

2081

2369

if c.dbus_object_path == object_path:

2082

tcp_server.clients.remove(c)

2370

del tcp_server.clients[c.name]

2083

2371

c.remove_from_connection()

2084

2372

# Don't signal anything except ClientRemoved

2085

2373

c.disable(quiet=True)

2098

2386

"Cleanup function; run on exit"

2099

2387

service.cleanup()

2100

2388

2389

multiprocessing.active_children()

2390

if not (tcp_server.clients or client_settings):

2391

return

2392

2393

# Store client before exiting. Secrets are encrypted with key

2394

# based on what config file has. If config file is

2395

# removed/edited, old secret will thus be unrecovable.

2396

clients = []

2397

with Crypto() as crypt:

2398

for client in tcp_server.clients.itervalues():

2399

key = client_settings[client.name]["secret"]

2400

client.encrypted_secret = crypt.encrypt(client.secret,

2401

key)

2402

client_dict = {}

2403

2404

# A list of attributes that will not be stored when

2405

# shutting down.

2406

exclude = set(("bus", "changedstate", "secret"))

2407

for name, typ in (inspect.getmembers

2408

(dbus.service.Object)):

2409

exclude.add(name)

2410

2411

client_dict["encrypted_secret"] = (client

2412

.encrypted_secret)

2413

for attr in client.client_structure:

2414

if attr not in exclude:

2415

client_dict[attr] = getattr(client, attr)

2416

2417

clients.append(client_dict)

2418

del client_settings[client.name]["secret"]

2419

2420

try:

2421

with os.fdopen(os.open(stored_state_path,

2422

os.O_CREAT|os.O_WRONLY|os.O_TRUNC,

2423

0600), "wb") as stored_state:

2424

pickle.dump((clients, client_settings), stored_state)

2425

except (IOError, OSError) as e:

2426

logger.warning("Could not save persistent state: {0}"

2427

.format(e))

2428

if e.errno not in (errno.ENOENT, errno.EACCES):

2429

raise

2430

2431

# Delete all clients, and settings from config

2101

2432

while tcp_server.clients:

2102

client = tcp_server.clients.pop()

2433

name, client = tcp_server.clients.popitem()

2103

2434

if use_dbus:

2104

2435

client.remove_from_connection()

2105

client.disable_hook = None

2106

2436

# Don't signal anything except ClientRemoved

2107

2437

client.disable(quiet=True)

2108

2438

if use_dbus:

2109

2439

# Emit D-Bus signal

2110

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2440

mandos_dbus_service.ClientRemoved(client

2441

.dbus_object_path,

2111

2442

client.name)

2443

client_settings.clear()

2112

2444

2113

2445

atexit.register(cleanup)

2114

2446

2115

for client in tcp_server.clients:

2447

for client in tcp_server.clients.itervalues():

2116

2448

if use_dbus:

2117

2449

# Emit D-Bus signal

2118

2450

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2119

client.enable()

2451

# Need to initiate checking of clients

2452

if client.enabled:

2453

client.init_checker()

2120

2454

2121

2455

tcp_server.enable()

2122

2456

tcp_server.server_activate()