/mandos/trunk : revision 525

63

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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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.3.1"

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#logger = logging.getLogger('mandos')

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logger = logging.Logger('mandos')

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version = "1.4.1"

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stored_state_file = "clients.pickle"

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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 PGPError(Exception):

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"""Exception if encryption/decryption fails"""

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pass

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class PGPEngine(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 PGPError(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 PGPError(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,

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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())

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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)

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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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return ret

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def _timedelta_to_milliseconds(td):

380

def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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

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Attributes:

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_approved: bool(); 'None' if not yet approved/disapproved

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approved: bool(); 'None' if not yet approved/disapproved

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approval_delay: datetime.timedelta(); Time to wait for approval

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approval_duration: datetime.timedelta(); Duration of one approval

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checker: subprocess.Popen(); a running checker process used

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

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checker_initiator_tag: a gobject event source tag, or None

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

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client_structure: Object describing what attributes a client has

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and is used for storing the client at exit

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current_checker_command: string; current running checker_command

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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

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checker, or None.

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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

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"created", "enabled", "fingerprint",

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"host", "interval", "last_checked_ok",

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"last_enabled", "name", "timeout")

433

client_defaults = { "timeout": "5m",

434

"extended_timeout": "15m",

435

"interval": "2m",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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318

444

def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

446

return timedelta_to_milliseconds(self.timeout)

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447

322

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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)

450

return timedelta_to_milliseconds(self.extended_timeout)

325

451

326

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

328

return _timedelta_to_milliseconds(self.interval)

454

return timedelta_to_milliseconds(self.interval)

329

455

330

456

def approval_delay_milliseconds(self):

331

return _timedelta_to_milliseconds(self.approval_delay)

332

333

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

457

return timedelta_to_milliseconds(self.approval_delay)

458

459

@staticmethod

460

def config_parser(config):

461

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

462

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

463

with exceptions for any special settings as defined above"""

464

settings = {}

465

for client_name in config.sections():

466

section = dict(config.items(client_name))

467

client = settings[client_name] = {}

468

469

client["host"] = section["host"]

470

# Reformat values from string types to Python types

471

client["approved_by_default"] = config.getboolean(

472

client_name, "approved_by_default")

473

client["enabled"] = config.getboolean(client_name, "enabled")

474

475

client["fingerprint"] = (section["fingerprint"].upper()

476

.replace(" ", ""))

477

if "secret" in section:

478

client["secret"] = section["secret"].decode("base64")

479

elif "secfile" in section:

480

with open(os.path.expanduser(os.path.expandvars

481

(section["secfile"])),

482

"rb") as secfile:

483

client["secret"] = secfile.read()

484

else:

485

raise TypeError("No secret or secfile for section %s"

486

% section)

487

client["timeout"] = string_to_delta(section["timeout"])

488

client["extended_timeout"] = string_to_delta(

489

section["extended_timeout"])

490

client["interval"] = string_to_delta(section["interval"])

491

client["approval_delay"] = string_to_delta(

492

section["approval_delay"])

493

client["approval_duration"] = string_to_delta(

494

section["approval_duration"])

495

client["checker_command"] = section["checker"]

496

client["last_approval_request"] = None

497

client["last_checked_ok"] = None

498

client["last_checker_status"] = None

499

if client["enabled"]:

500

client["last_enabled"] = datetime.datetime.utcnow()

501

client["expires"] = (datetime.datetime.utcnow()

502

+ client["timeout"])

503

else:

504

client["last_enabled"] = None

505

client["expires"] = None

506

507

return settings

508

509

510

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

334

511

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

335

512

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

336

513

attribute."""

337

514

self.name = name

338

if config is None:

339

config = {}

515

# adding all client settings

516

for setting, value in settings.iteritems():

517

setattr(self, setting, value)

518

340

519

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

341

520

# Uppercase and remove spaces from fingerprint for later

342

521

# comparison purposes with return value from the fingerprint()

343

522

# function

344

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

345

.replace(" ", ""))

346

523

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

347

if "secret" in config:

348

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

349

elif "secfile" in config:

350

with open(os.path.expanduser(os.path.expandvars

351

(config["secfile"])),

352

"rb") as secfile:

353

self.secret = secfile.read()

354

else:

355

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

356

% self.name)

357

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

358

self.created = datetime.datetime.utcnow()

359

self.enabled = False

360

self.last_approval_request = None

361

self.last_enabled = None

362

self.last_checked_ok = None

363

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

364

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

365

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

366

self.disable_hook = disable_hook

524

self.created = settings.get("created", datetime.datetime.utcnow())

525

526

# attributes specific for this server instance

367

527

self.checker = None

368

528

self.checker_initiator_tag = None

369

529

self.disable_initiator_tag = None

370

self.expires = None

371

530

self.checker_callback_tag = None

372

self.checker_command = config["checker"]

373

531

self.current_checker_command = None

374

self.last_connect = None

375

self._approved = None

376

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

377

True)

532

self.approved = None

378

533

self.approvals_pending = 0

379

self.approval_delay = string_to_delta(

380

config["approval_delay"])

381

self.approval_duration = string_to_delta(

382

config["approval_duration"])

383

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

534

self.changedstate = (multiprocessing_manager

535

.Condition(multiprocessing_manager

536

.Lock()))

537

self.client_structure = [attr for attr in

538

self.__dict__.iterkeys()

539

if not attr.startswith("_")]

540

self.client_structure.append("client_structure")

541

542

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

543

lambda obj:

544

isinstance(obj,

545

property)):

546

if not name.startswith("_"):

547

self.client_structure.append(name)

384

548

549

# Send notice to process children that client state has changed

385

550

def send_changedstate(self):

386

self.changedstate.acquire()

387

self.changedstate.notify_all()

388

self.changedstate.release()

389

551

with self.changedstate:

552

self.changedstate.notify_all()

553

390

554

def enable(self):

391

555

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

392

556

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

393

557

# Already enabled

394

558

return

395

559

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

560

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

403

self.disable_initiator_tag = (gobject.timeout_add

404

(self.timeout_milliseconds(),

405

self.disable))

406

561

self.enabled = True

407

562

self.last_enabled = datetime.datetime.utcnow()

408

# Also start a new checker *right now*.

409

self.start_checker()

563

self.init_checker()

410

564

411

565

def disable(self, quiet=True):

412

566

"""Disable this client."""

424

578

gobject.source_remove(self.checker_initiator_tag)

425

579

self.checker_initiator_tag = None

426

580

self.stop_checker()

427

if self.disable_hook:

428

self.disable_hook(self)

429

581

self.enabled = False

430

582

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

431

583

return False

432

584

433

585

def __del__(self):

434

self.disable_hook = None

435

586

self.disable()

436

587

588

def init_checker(self):

589

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

590

# and every interval from then on.

591

self.checker_initiator_tag = (gobject.timeout_add

592

(self.interval_milliseconds(),

593

self.start_checker))

594

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

595

self.disable_initiator_tag = (gobject.timeout_add

596

(self.timeout_milliseconds(),

597

self.disable))

598

# Also start a new checker *right now*.

599

self.start_checker()

600

437

601

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

438

602

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

439

603

self.checker_callback_tag = None

440

604

self.checker = None

441

605

if os.WIFEXITED(condition):

442

exitstatus = os.WEXITSTATUS(condition)

443

if exitstatus == 0:

606

self.last_checker_status = os.WEXITSTATUS(condition)

607

if self.last_checker_status == 0:

444

608

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

445

609

vars(self))

446

610

self.checked_ok()

448

612

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

449

613

vars(self))

450

614

else:

615

self.last_checker_status = -1

451

616

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

452

617

vars(self))

453

618

460

625

if timeout is None:

461

626

timeout = self.timeout

462

627

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))

628

if self.disable_initiator_tag is not None:

629

gobject.source_remove(self.disable_initiator_tag)

630

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

631

self.disable_initiator_tag = (gobject.timeout_add

632

(timedelta_to_milliseconds

633

(timeout), self.disable))

634

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

468

635

469

636

def need_approval(self):

470

637

self.last_approval_request = datetime.datetime.utcnow()

629

796

"""

630

797

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

631

798

for cls in self.__class__.__mro__

632

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

799

for name, prop in

800

inspect.getmembers(cls, self._is_dbus_property))

633

801

634

802

def _get_dbus_property(self, interface_name, property_name):

635

803

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

636

804

property with the specified name and interface.

637

805

"""

638

806

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:

807

for name, value in (inspect.getmembers

808

(cls, self._is_dbus_property)):

809

if (value._dbus_name == property_name

810

and value._dbus_interface == interface_name):

641

811

return value.__get__(self)

642

812

643

813

# No such property

682

852

683

853

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

684

854

"""

685

all = {}

855

properties = {}

686

856

for name, prop in self._get_all_dbus_properties():

687

857

if (interface_name

688

858

and interface_name != prop._dbus_interface):

693

863

continue

694

864

value = prop()

695

865

if not hasattr(value, "variant_level"):

696

all[name] = value

866

properties[name] = value

697

867

continue

698

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

699

value.variant_level+1)

700

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

868

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

869

value.variant_level+1)

870

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

701

871

702

872

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

703

873

out_signature="s",

754

924

return dbus.String(dt.isoformat(),

755

925

variant_level=variant_level)

756

926

757

class AlternateDBusNamesMetaclass(DBusObjectWithProperties.__metaclass__):

927

928

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

929

.__metaclass__):

758

930

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

759

931

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

760

932

"""

850

1022

attribute.func_closure)))

851

1023

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

852

1024

1025

853

1026

class ClientDBus(Client, DBusObjectWithProperties):

854

1027

"""A Client class using D-Bus

855

1028

864

1037

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

865

1038

866

1039

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

867

self._approvals_pending = 0

868

1040

self.bus = bus

869

1041

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

1042

self._approvals_pending = 0

1043

1044

self._approvals_pending = 0

870

1045

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

871

1046

# the D-Bus

872

1047

client_object_name = unicode(self.name).translate(

882

1057

variant_level=1):

883

1058

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

884

1059

its changes to DBus.

885

886

transform_fun: Function that takes a value and transforms it

887

to a D-Bus type.

1060

1061

transform_fun: Function that takes a value and a variant_level

1062

and transforms it to a D-Bus type.

888

1063

dbus_name: D-Bus name of the variable

889

1064

type_func: Function that transform the value before sending it

890

1065

to the D-Bus. Default: no transform

891

1066

variant_level: D-Bus variant level. Default: 1

892

1067

"""

893

real_value = [None,]

1068

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

894

1069

def setter(self, value):

895

old_value = real_value[0]

896

real_value[0] = value

897

1070

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)

1071

if (not hasattr(self, attrname) or

1072

type_func(getattr(self, attrname, None))

1073

!= type_func(value)):

1074

dbus_value = transform_func(type_func(value),

1075

variant_level

1076

=variant_level)

901

1077

self.PropertyChanged(dbus.String(dbus_name),

902

1078

dbus_value)

1079

setattr(self, attrname, value)

903

1080

904

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

1081

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

905

1082

906

1083

907

1084

expires = notifychangeproperty(datetime_to_dbus, "Expires")

912

1089

last_enabled = notifychangeproperty(datetime_to_dbus,

913

1090

"LastEnabled")

914

1091

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

915

type_func = lambda checker: checker is not None)

1092

type_func = lambda checker:

1093

checker is not None)

916

1094

last_checked_ok = notifychangeproperty(datetime_to_dbus,

917

1095

"LastCheckedOK")

918

last_approval_request = notifychangeproperty(datetime_to_dbus,

919

"LastApprovalRequest")

1096

last_approval_request = notifychangeproperty(

1097

datetime_to_dbus, "LastApprovalRequest")

920

1098

approved_by_default = notifychangeproperty(dbus.Boolean,

921

1099

"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)

1100

approval_delay = notifychangeproperty(dbus.UInt64,

1101

"ApprovalDelay",

1102

type_func =

1103

timedelta_to_milliseconds)

1104

approval_duration = notifychangeproperty(

1105

dbus.UInt64, "ApprovalDuration",

1106

type_func = timedelta_to_milliseconds)

926

1107

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

927

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)

1108

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

1109

type_func =

1110

timedelta_to_milliseconds)

1111

extended_timeout = notifychangeproperty(

1112

dbus.UInt64, "ExtendedTimeout",

1113

type_func = timedelta_to_milliseconds)

1114

interval = notifychangeproperty(dbus.UInt64,

1115

"Interval",

1116

type_func =

1117

timedelta_to_milliseconds)

933

1118

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

934

1119

935

1120

del notifychangeproperty

977

1162

return r

978

1163

979

1164

def _reset_approved(self):

980

self._approved = None

1165

self.approved = None

981

1166

return False

982

1167

983

1168

def approve(self, value=True):

984

1169

self.send_changedstate()

985

self._approved = value

986

gobject.timeout_add(_timedelta_to_milliseconds

1170

self.approved = value

1171

gobject.timeout_add(timedelta_to_milliseconds

987

1172

(self.approval_duration),

988

1173

self._reset_approved)

989

1174

1032

1217

"D-Bus signal"

1033

1218

return self.need_approval()

1034

1219

1220

# NeRwequest - signal

1221

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

1222

def NewRequest(self, ip):

1223

"""D-Bus signal

1224

Is sent after a client request a password.

1225

"""

1226

pass

1227

1035

1228

## Methods

1036

1229

1037

1230

# Approve - method

1095

1288

access="readwrite")

1096

1289

def ApprovalDuration_dbus_property(self, value=None):

1097

1290

if value is None: # get

1098

return dbus.UInt64(_timedelta_to_milliseconds(

1291

return dbus.UInt64(timedelta_to_milliseconds(

1099

1292

self.approval_duration))

1100

1293

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

1101

1294

1115

1308

def Host_dbus_property(self, value=None):

1116

1309

if value is None: # get

1117

1310

return dbus.String(self.host)

1118

self.host = value

1311

self.host = unicode(value)

1119

1312

1120

1313

# Created - property

1121

1314

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

1122

1315

def Created_dbus_property(self):

1123

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

1316

return datetime_to_dbus(self.created)

1124

1317

1125

1318

# LastEnabled - property

1126

1319

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

1170

1363

gobject.source_remove(self.disable_initiator_tag)

1171

1364

self.disable_initiator_tag = None

1172

1365

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()))

1366

time_to_die = timedelta_to_milliseconds((self

1367

.last_checked_ok

1368

+ self.timeout)

1369

- datetime.datetime

1370

.utcnow())

1179

1371

if time_to_die <= 0:

1180

1372

# The timeout has passed

1181

1373

self.disable()

1182

1374

else:

1183

1375

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

1184

+ datetime.timedelta(milliseconds = time_to_die))

1376

+ datetime.timedelta(milliseconds =

1377

time_to_die))

1185

1378

self.disable_initiator_tag = (gobject.timeout_add

1186

1379

(time_to_die, self.disable))

1187

1380

1202

1395

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

1203

1396

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

1204

1397

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

1398

if self.enabled:

1399

# Reschedule checker run

1400

gobject.source_remove(self.checker_initiator_tag)

1401

self.checker_initiator_tag = (gobject.timeout_add

1402

(value, self.start_checker))

1403

self.start_checker() # Start one now, too

1210

1404

1211

1405

# Checker - property

1212

1406

@dbus_service_property(_interface, signature="s",

1214

1408

def Checker_dbus_property(self, value=None):

1215

1409

if value is None: # get

1216

1410

return dbus.String(self.checker_command)

1217

self.checker_command = value

1411

self.checker_command = unicode(value)

1218

1412

1219

1413

# CheckerRunning - property

1220

1414

@dbus_service_property(_interface, signature="b",

1249

1443

raise KeyError()

1250

1444

1251

1445

def __getattribute__(self, name):

1252

if(name == '_pipe'):

1446

if name == '_pipe':

1253

1447

return super(ProxyClient, self).__getattribute__(name)

1254

1448

self._pipe.send(('getattr', name))

1255

1449

data = self._pipe.recv()

1262

1456

return func

1263

1457

1264

1458

def __setattr__(self, name, value):

1265

if(name == '_pipe'):

1459

if name == '_pipe':

1266

1460

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

1267

1461

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

1268

1462

1463

1269

1464

class ClientDBusTransitional(ClientDBus):

1270

1465

__metaclass__ = AlternateDBusNamesMetaclass

1271

1466

1467

1272

1468

class ClientHandler(socketserver.BaseRequestHandler, object):

1273

1469

"""A class to handle client connections.

1274

1470

1342

1538

except KeyError:

1343

1539

return

1344

1540

1541

if self.server.use_dbus:

1542

# Emit D-Bus signal

1543

client.NewRequest(str(self.client_address))

1544

1345

1545

if client.approval_delay:

1346

1546

delay = client.approval_delay

1347

1547

client.approvals_pending += 1

1353

1553

client.name)

1354

1554

if self.server.use_dbus:

1355

1555

# Emit D-Bus signal

1356

client.Rejected("Disabled")

1556

client.Rejected("Disabled")

1357

1557

return

1358

1558

1359

if client._approved or not client.approval_delay:

1559

if client.approved or not client.approval_delay:

1360

1560

#We are approved or approval is disabled

1361

1561

break

1362

elif client._approved is None:

1562

elif client.approved is None:

1363

1563

logger.info("Client %s needs approval",

1364

1564

client.name)

1365

1565

if self.server.use_dbus:

1376

1576

return

1377

1577

1378

1578

#wait until timeout or approved

1379

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

1380

1579

time = datetime.datetime.now()

1381

1580

client.changedstate.acquire()

1382

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

1581

(client.changedstate.wait

1582

(float(client.timedelta_to_milliseconds(delay)

1583

/ 1000)))

1383

1584

client.changedstate.release()

1384

1585

time2 = datetime.datetime.now()

1385

1586

if (time2 - time) >= delay:

1409

1610

sent_size += sent

1410

1611

1411

1612

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

1412

# bump the timeout as if seen

1613

# bump the timeout using extended_timeout

1413

1614

client.checked_ok(client.extended_timeout)

1414

1615

if self.server.use_dbus:

1415

1616

# Emit D-Bus signal

1483

1684

# Convert the buffer to a Python bytestring

1484

1685

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

1485

1686

# Convert the bytestring to hexadecimal notation

1486

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

1687

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

1487

1688

return hex_fpr

1488

1689

1489

1690

1492

1693

def sub_process_main(self, request, address):

1493

1694

try:

1494

1695

self.finish_request(request, address)

1495

except:

1696

except Exception:

1496

1697

self.handle_error(request, address)

1497

1698

self.close_request(request)

1498

1699

1499

1700

def process_request(self, request, address):

1500

1701

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

1501

multiprocessing.Process(target = self.sub_process_main,

1502

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

1702

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

1703

args = (request,

1704

address))

1705

proc.start()

1706

return proc

1503

1707

1504

1708

1505

1709

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1511

1715

"""

1512

1716

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1513

1717

1514

super(MultiprocessingMixInWithPipe,

1515

self).process_request(request, client_address)

1718

proc = MultiprocessingMixIn.process_request(self, request,

1719

client_address)

1516

1720

self.child_pipe.close()

1517

self.add_pipe(parent_pipe)

1721

self.add_pipe(parent_pipe, proc)

1518

1722

1519

def add_pipe(self, parent_pipe):

1723

def add_pipe(self, parent_pipe, proc):

1520

1724

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

1521

1725

raise NotImplementedError

1522

1726

1600

1804

self.enabled = False

1601

1805

self.clients = clients

1602

1806

if self.clients is None:

1603

self.clients = set()

1807

self.clients = {}

1604

1808

self.use_dbus = use_dbus

1605

1809

self.gnutls_priority = gnutls_priority

1606

1810

IPv6_TCPServer.__init__(self, server_address,

1610

1814

def server_activate(self):

1611

1815

if self.enabled:

1612

1816

return socketserver.TCPServer.server_activate(self)

1817

1613

1818

def enable(self):

1614

1819

self.enabled = True

1615

def add_pipe(self, parent_pipe):

1820

1821

def add_pipe(self, parent_pipe, proc):

1616

1822

# Call "handle_ipc" for both data and EOF events

1617

1823

gobject.io_add_watch(parent_pipe.fileno(),

1618

1824

gobject.IO_IN | gobject.IO_HUP,

1619

1825

functools.partial(self.handle_ipc,

1620

parent_pipe = parent_pipe))

1621

1826

parent_pipe =

1827

parent_pipe,

1828

proc = proc))

1829

1622

1830

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

1623

client_object=None):

1831

proc = None, client_object=None):

1624

1832

condition_names = {

1625

1833

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

1626

1834

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

1635

1843

for cond, name in

1636

1844

condition_names.iteritems()

1637

1845

if cond & condition)

1638

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

1846

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

1639

1847

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

1848

# Wait for other process to exit

1849

proc.join()

1640

1850

return False

1641

1851

1642

1852

# Read a request from the child

1647

1857

fpr = request[1]

1648

1858

address = request[2]

1649

1859

1650

for c in self.clients:

1860

for c in self.clients.itervalues():

1651

1861

if c.fingerprint == fpr:

1652

1862

client = c

1653

1863

break

1656

1866

"dress: %s", fpr, address)

1657

1867

if self.use_dbus:

1658

1868

# Emit D-Bus signal

1659

mandos_dbus_service.ClientNotFound(fpr, address[0])

1869

mandos_dbus_service.ClientNotFound(fpr,

1870

address[0])

1660

1871

parent_pipe.send(False)

1661

1872

return False

1662

1873

1663

1874

gobject.io_add_watch(parent_pipe.fileno(),

1664

1875

gobject.IO_IN | gobject.IO_HUP,

1665

1876

functools.partial(self.handle_ipc,

1666

parent_pipe = parent_pipe,

1667

client_object = client))

1877

parent_pipe =

1878

parent_pipe,

1879

proc = proc,

1880

client_object =

1881

client))

1668

1882

parent_pipe.send(True)

1669

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

1883

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

1884

# same fileno

1670

1885

return False

1671

1886

if command == 'funcall':

1672

1887

funcname = request[1]

1673

1888

args = request[2]

1674

1889

kwargs = request[3]

1675

1890

1676

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

1891

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

1892

funcname)(*args,

1893

**kwargs)))

1677

1894

1678

1895

if command == 'getattr':

1679

1896

attrname = request[1]

1680

1897

if callable(client_object.__getattribute__(attrname)):

1681

1898

parent_pipe.send(('function',))

1682

1899

else:

1683

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

1900

parent_pipe.send(('data', client_object

1901

.__getattribute__(attrname)))

1684

1902

1685

1903

if command == 'setattr':

1686

1904

attrname = request[1]

1729

1947

return timevalue

1730

1948

1731

1949

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

1950

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

1757

1951

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

1758

1952

1813

2007

" system bus interface")

1814

2008

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

1815

2009

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

2010

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

2011

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

2012

" state")

2013

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

2014

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

2015

1816

2016

options = parser.parse_args()

1817

2017

1818

2018

if options.check:

1831

2031

"use_dbus": "True",

1832

2032

"use_ipv6": "True",

1833

2033

"debuglevel": "",

2034

"restore": "True",

2035

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

1834

2036

}

1835

2037

1836

2038

# Parse config file for server-global settings

1853

2055

# options, if set.

1854

2056

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

1855

2057

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

1856

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

2058

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

2059

"statedir"):

1857

2060

value = getattr(options, option)

1858

2061

if value is not None:

1859

2062

server_settings[option] = value

1871

2074

debuglevel = server_settings["debuglevel"]

1872

2075

use_dbus = server_settings["use_dbus"]

1873

2076

use_ipv6 = server_settings["use_ipv6"]

2077

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

2078

stored_state_file)

2079

2080

if debug:

2081

initlogger(logging.DEBUG)

2082

else:

2083

if not debuglevel:

2084

initlogger()

2085

else:

2086

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

2087

initlogger(level)

1874

2088

1875

2089

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

1876

2090

syslogger.setFormatter(logging.Formatter

1879

2093

% server_settings["servicename"]))

1880

2094

1881

2095

# Parse config file with clients

1882

client_defaults = { "timeout": "5m",

1883

"extended_timeout": "15m",

1884

"interval": "2m",

1885

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

1886

"host": "",

1887

"approval_delay": "0s",

1888

"approval_duration": "1s",

1889

}

1890

client_config = configparser.SafeConfigParser(client_defaults)

2096

client_config = configparser.SafeConfigParser(Client.client_defaults)

1891

2097

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

1892

2098

"clients.conf"))

1893

2099

1931

2137

if error[0] != errno.EPERM:

1932

2138

raise error

1933

2139

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

2140

if debug:

1943

2141

# Enable all possible GnuTLS debugging

1944

2142

1977

2175

try:

1978

2176

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

1979

2177

bus, do_not_queue=True)

1980

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

1981

bus, do_not_queue=True)

2178

old_bus_name = (dbus.service.BusName

2179

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

2180

do_not_queue=True))

1982

2181

except dbus.exceptions.NameExistsException as e:

1983

2182

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

1984

2183

use_dbus = False

1985

2184

server_settings["use_dbus"] = False

1986

2185

tcp_server.use_dbus = False

1987

2186

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)

2187

service = AvahiServiceToSyslog(name =

2188

server_settings["servicename"],

2189

servicetype = "_mandos._tcp",

2190

protocol = protocol, bus = bus)

1991

2191

if server_settings["interface"]:

1992

2192

service.interface = (if_nametoindex

1993

2193

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

1997

2197

1998

2198

client_class = Client

1999

2199

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):

2200

client_class = functools.partial(ClientDBusTransitional,

2201

bus = bus)

2202

2203

client_settings = Client.config_parser(client_config)

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 PGPEngine() as pgp:

2221

for client_name, client in clients_data.iteritems():

2222

# Decide which value to use after restoring saved state.

2223

# We have three different values: Old config file,

2224

# new config file, and saved state.

2225

# New config value takes precedence if it differs from old

2226

# config value, otherwise use saved state.

2227

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

2228

try:

2229

# For each value in new config, check if it

2230

# differs from the old config value (Except for

2231

# the "secret" attribute)

2232

if (name != "secret" and

2233

value != old_client_settings[client_name]

2234

[name]):

2235

client[name] = value

2236

except KeyError:

2237

pass

2238

2239

# Clients who has passed its expire date can still be

2240

# enabled if its last checker was successful. Clients

2241

# whose checker failed before we stored its state is

2242

# assumed to have failed all checkers during downtime.

2243

if client["enabled"]:

2244

if datetime.datetime.utcnow() >= client["expires"]:

2245

if not client["last_checked_ok"]:

2246

logger.warning(

2247

"disabling client {0} - Client never "

2248

"performed a successfull checker"

2249

.format(client["name"]))

2250

client["enabled"] = False

2251

elif client["last_checker_status"] != 0:

2252

logger.warning(

2253

"disabling client {0} - Client "

2254

"last checker failed with error code {1}"

2255

.format(client["name"],

2256

client["last_checker_status"]))

2257

client["enabled"] = False

2258

else:

2259

client["expires"] = (datetime.datetime

2260

.utcnow()

2261

+ client["timeout"])

2262

2008

2263

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()))

2264

client["secret"] = (

2265

pgp.decrypt(client["encrypted_secret"],

2266

client_settings[client_name]

2267

["secret"]))

2268

except PGPError:

2269

# If decryption fails, we use secret from new settings

2270

logger.debug("Failed to decrypt {0} old secret"

2271

.format(client_name))

2272

client["secret"] = (

2273

client_settings[client_name]["secret"])

2274

2275

2276

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

2277

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

2278

del clients_data[client_name]

2279

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

2280

clients_data[client_name] = client_settings[client_name]

2281

2282

# Create clients all clients

2283

for client_name, client in clients_data.iteritems():

2284

tcp_server.clients[client_name] = client_class(

2285

name = client_name, settings = client)

2286

2018

2287

if not tcp_server.clients:

2019

2288

logger.warning("No clients defined")

2020

2289

2031

2300

# "pidfile" was never created

2032

2301

pass

2033

2302

del pidfilename

2034

2035

2303

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

2036

2304

2037

2305

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

2063

2331

def GetAllClients(self):

2064

2332

"D-Bus method"

2065

2333

return dbus.Array(c.dbus_object_path

2066

for c in tcp_server.clients)

2334

for c in

2335

tcp_server.clients.itervalues())

2067

2336

2068

2337

@dbus.service.method(_interface,

2069

2338

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

2071

2340

"D-Bus method"

2072

2341

return dbus.Dictionary(

2073

2342

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

2074

for c in tcp_server.clients),

2343

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

2075

2344

signature="oa{sv}")

2076

2345

2077

2346

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

2078

2347

def RemoveClient(self, object_path):

2079

2348

"D-Bus method"

2080

for c in tcp_server.clients:

2349

for c in tcp_server.clients.itervalues():

2081

2350

if c.dbus_object_path == object_path:

2082

tcp_server.clients.remove(c)

2351

del tcp_server.clients[c.name]

2083

2352

c.remove_from_connection()

2084

2353

# Don't signal anything except ClientRemoved

2085

2354

c.disable(quiet=True)

2098

2367

"Cleanup function; run on exit"

2099

2368

service.cleanup()

2100

2369

2370

multiprocessing.active_children()

2371

if not (tcp_server.clients or client_settings):

2372

return

2373

2374

# Store client before exiting. Secrets are encrypted with key

2375

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

2376

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

2377

clients = {}

2378

with PGPEngine() as pgp:

2379

for client in tcp_server.clients.itervalues():

2380

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

2381

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

2382

key)

2383

client_dict = {}

2384

2385

# A list of attributes that can not be pickled

2386

# + secret.

2387

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

2388

"checker"))

2389

for name, typ in (inspect.getmembers

2390

(dbus.service.Object)):

2391

exclude.add(name)

2392

2393

client_dict["encrypted_secret"] = (client

2394

.encrypted_secret)

2395

for attr in client.client_structure:

2396

if attr not in exclude:

2397

client_dict[attr] = getattr(client, attr)

2398

2399

clients[client.name] = client_dict

2400

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

2401

2402

try:

2403

with os.fdopen(os.open(stored_state_path,

2404

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

2405

0600), "wb") as stored_state:

2406

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

2407

except (IOError, OSError) as e:

2408

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

2409

.format(e))

2410

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

2411

raise

2412

2413

# Delete all clients, and settings from config

2101

2414

while tcp_server.clients:

2102

client = tcp_server.clients.pop()

2415

name, client = tcp_server.clients.popitem()

2103

2416

if use_dbus:

2104

2417

client.remove_from_connection()

2105

client.disable_hook = None

2106

2418

# Don't signal anything except ClientRemoved

2107

2419

client.disable(quiet=True)

2108

2420

if use_dbus:

2109

2421

# Emit D-Bus signal

2110

mandos_dbus_service.ClientRemoved(client.dbus_object_path,

2422

mandos_dbus_service.ClientRemoved(client

2423

.dbus_object_path,

2111

2424

client.name)

2425

client_settings.clear()

2112

2426

2113

2427

atexit.register(cleanup)

2114

2428

2115

for client in tcp_server.clients:

2429

for client in tcp_server.clients.itervalues():

2116

2430

if use_dbus:

2117

2431

# Emit D-Bus signal

2118

2432

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2119

client.enable()

2433

# Need to initiate checking of clients

2434

if client.enabled:

2435

client.init_checker()

2120

2436

2121

2437

tcp_server.enable()

2122

2438

tcp_server.server_activate()

2162

2478

# Must run before the D-Bus bus name gets deregistered

2163

2479

cleanup()

2164

2480

2165

2166

2481

if __name__ == '__main__':

2167

2482

main()