/mandos/trunk : revision 549

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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import cPickle as pickle

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import multiprocessing

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import types

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import hashlib

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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 Crypto.Cipher.AES

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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 = "1.4.1"

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version = "1.5.0"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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stored_state_path = "/var/lib/mandos/clients.pickle"

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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('%(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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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(debug, 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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if debug:

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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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'--no-use-agent'])

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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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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.name))

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return ret

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def _timedelta_to_milliseconds(td):

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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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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_checker_status: integer between 0 and 255 reflecting exit

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status of last checker. -1 reflect crashed

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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)

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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")

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

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"extended_timeout": "15m",

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"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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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.timeout)

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.extended_timeout)

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return _timedelta_to_milliseconds(self.interval)

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

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

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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

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

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with exceptions for any special settings as defined above.

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NOTE: Must be a pure function. Must return the same result

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value given the same arguments.

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"""

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settings = {}

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for client_name in config.sections():

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section = dict(config.items(client_name))

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client = settings[client_name] = {}

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

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# Reformat values from string types to Python types

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client["approved_by_default"] = config.getboolean(

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client_name, "approved_by_default")

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

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"enabled")

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

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.replace(" ", ""))

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if "secret" in section:

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

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elif "secfile" in section:

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

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(section["secfile"])),

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"rb") as secfile:

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

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else:

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

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% section)

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

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client["extended_timeout"] = string_to_delta(

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section["extended_timeout"])

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

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client["approval_delay"] = string_to_delta(

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section["approval_delay"])

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client["approval_duration"] = string_to_delta(

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section["approval_duration"])

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

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client["last_approval_request"] = None

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client["last_checked_ok"] = None

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client["last_checker_status"] = None

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return settings

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

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

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

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attribute."""

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self.name = name

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if config is None:

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config = {}

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# adding all client settings

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if not hasattr(self, "last_enabled"):

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self.last_enabled = datetime.datetime.utcnow()

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if not hasattr(self, "expires"):

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

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+ self.timeout)

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else:

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self.last_enabled = None

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self.expires = None

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

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the fingerprint()

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# function

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

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.replace(" ", ""))

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

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if "secret" in config:

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

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elif "secfile" in config:

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

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(config["secfile"])),

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"rb") as secfile:

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self.secret = secfile.read()

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else:

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

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% self.name)

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

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self.created = datetime.datetime.utcnow()

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self.enabled = True

375

self.last_approval_request = None

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self.last_enabled = datetime.datetime.utcnow()

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self.last_checked_ok = None

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self.last_checker_status = None

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

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self.extended_timeout = string_to_delta(config

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["extended_timeout"])

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

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self.created = settings.get("created",

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datetime.datetime.utcnow())

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# attributes specific for this server instance

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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

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

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self.checker_callback_tag = None

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self.checker_command = config["checker"]

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541

self.current_checker_command = None

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self._approved = None

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

392

True)

542

self.approved = None

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543

self.approvals_pending = 0

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self.approval_delay = string_to_delta(

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config["approval_delay"])

396

self.approval_duration = string_to_delta(

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config["approval_duration"])

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self.changedstate = (multiprocessing_manager

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.Condition(multiprocessing_manager

400

546

.Lock()))

401

self.client_structure = [attr for attr

402

in self.__dict__.iterkeys()

547

self.client_structure = [attr for attr in

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self.__dict__.iterkeys()

403

549

if not attr.startswith("_")]

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self.client_structure.append("client_structure")

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

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lambda obj:

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isinstance(obj,

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594

450

595

def __del__(self):

451

596

self.disable()

452

597

453

598

def init_checker(self):

454

599

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

455

600

# and every interval from then on.

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607

self.disable))

463

608

# Also start a new checker *right now*.

464

609

self.start_checker()

465

466

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

468

612

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

469

613

self.checker_callback_tag = None

470

614

self.checker = None

471

615

if os.WIFEXITED(condition):

472

self.last_checker_status = os.WEXITSTATUS(condition)

616

self.last_checker_status = os.WEXITSTATUS(condition)

473

617

if self.last_checker_status == 0:

474

618

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

475

619

vars(self))

495

639

gobject.source_remove(self.disable_initiator_tag)

496

640

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

497

641

self.disable_initiator_tag = (gobject.timeout_add

498

(_timedelta_to_milliseconds

642

(timedelta_to_milliseconds

499

643

(timeout), self.disable))

500

644

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

501

645

595

739

raise

596

740

self.checker = None

597

741

598

# Encrypts a client secret and stores it in a varible

599

# encrypted_secret

600

def encrypt_secret(self, key):

601

# Encryption-key need to be of a specific size, so we hash

602

# supplied key

603

hasheng = hashlib.sha256()

604

hasheng.update(key)

605

encryptionkey = hasheng.digest()

606

607

# Create validation hash so we know at decryption if it was

608

# sucessful

609

hasheng = hashlib.sha256()

610

hasheng.update(self.secret)

611

validationhash = hasheng.digest()

612

613

# Encrypt secret

614

iv = os.urandom(Crypto.Cipher.AES.block_size)

615

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

616

Crypto.Cipher.AES.MODE_CFB, iv)

617

ciphertext = ciphereng.encrypt(validationhash+self.secret)

618

self.encrypted_secret = (ciphertext, iv)

619

620

# Decrypt a encrypted client secret

621

def decrypt_secret(self, key):

622

# Decryption-key need to be of a specific size, so we hash

623

# supplied key

624

hasheng = hashlib.sha256()

625

hasheng.update(key)

626

encryptionkey = hasheng.digest()

627

628

# Decrypt encrypted secret

629

ciphertext, iv = self.encrypted_secret

630

ciphereng = Crypto.Cipher.AES.new(encryptionkey,

631

Crypto.Cipher.AES.MODE_CFB, iv)

632

plain = ciphereng.decrypt(ciphertext)

633

634

# Validate decrypted secret to know if it was succesful

635

hasheng = hashlib.sha256()

636

validationhash = plain[:hasheng.digest_size]

637

secret = plain[hasheng.digest_size:]

638

hasheng.update(secret)

639

640

# If validation fails, we use key as new secret. Otherwise, we

641

# use the decrypted secret

642

if hasheng.digest() == validationhash:

643

self.secret = secret

644

else:

645

self.secret = key

646

del self.encrypted_secret

647

648

742

649

743

def dbus_service_property(dbus_interface, signature="v",

650

744

access="readwrite", byte_arrays=False):

756

850

# signatures other than "ay".

757

851

if prop._dbus_signature != "ay":

758

852

raise ValueError

759

value = dbus.ByteArray(''.join(unichr(byte)

760

for byte in value))

853

value = dbus.ByteArray(b''.join(chr(byte)

854

for byte in value))

761

855

prop(value)

762

856

763

857

@dbus.service.method(dbus.PROPERTIES_IFACE, in_signature="s",

768

862

769

863

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

770

864

"""

771

all = {}

865

properties = {}

772

866

for name, prop in self._get_all_dbus_properties():

773

867

if (interface_name

774

868

and interface_name != prop._dbus_interface):

779

873

continue

780

874

value = prop()

781

875

if not hasattr(value, "variant_level"):

782

all[name] = value

876

properties[name] = value

783

877

continue

784

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

785

value.variant_level+1)

786

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

878

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

879

value.variant_level+1)

880

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

787

881

788

882

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

789

883

out_signature="s",

840

934

return dbus.String(dt.isoformat(),

841

935

variant_level=variant_level)

842

936

937

843

938

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

844

939

.__metaclass__):

845

940

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

937

1032

attribute.func_closure)))

938

1033

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

939

1034

1035

940

1036

class ClientDBus(Client, DBusObjectWithProperties):

941

1037

"""A Client class using D-Bus

942

1038

952

1048

953

1049

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

954

1050

self.bus = bus

955

self._approvals_pending = 0

956

1051

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

957

self.add_to_dbus()

958

959

def add_to_dbus(self):

1052

self._approvals_pending = 0

1053

1054

self._approvals_pending = 0

960

1055

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

961

1056

# the D-Bus

962

1057

client_object_name = unicode(self.name).translate(

972

1067

variant_level=1):

973

1068

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

974

1069

its changes to DBus.

975

1070

976

1071

transform_fun: Function that takes a value and a variant_level

977

1072

and transforms it to a D-Bus type.

978

1073

dbus_name: D-Bus name of the variable

1012

1107

datetime_to_dbus, "LastApprovalRequest")

1013

1108

approved_by_default = notifychangeproperty(dbus.Boolean,

1014

1109

"ApprovedByDefault")

1015

approval_delay = notifychangeproperty(dbus.UInt16,

1110

approval_delay = notifychangeproperty(dbus.UInt64,

1016

1111

"ApprovalDelay",

1017

1112

type_func =

1018

_timedelta_to_milliseconds)

1113

timedelta_to_milliseconds)

1019

1114

approval_duration = notifychangeproperty(

1020

dbus.UInt16, "ApprovalDuration",

1021

type_func = _timedelta_to_milliseconds)

1115

dbus.UInt64, "ApprovalDuration",

1116

type_func = timedelta_to_milliseconds)

1022

1117

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

1023

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

1118

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

1024

1119

type_func =

1025

_timedelta_to_milliseconds)

1120

timedelta_to_milliseconds)

1026

1121

extended_timeout = notifychangeproperty(

1027

dbus.UInt16, "ExtendedTimeout",

1028

type_func = _timedelta_to_milliseconds)

1029

interval = notifychangeproperty(dbus.UInt16,

1122

dbus.UInt64, "ExtendedTimeout",

1123

type_func = timedelta_to_milliseconds)

1124

interval = notifychangeproperty(dbus.UInt64,

1030

1125

"Interval",

1031

1126

type_func =

1032

_timedelta_to_milliseconds)

1127

timedelta_to_milliseconds)

1033

1128

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

1034

1129

1035

1130

del notifychangeproperty

1077

1172

return r

1078

1173

1079

1174

def _reset_approved(self):

1080

self._approved = None

1175

self.approved = None

1081

1176

return False

1082

1177

1083

1178

def approve(self, value=True):

1084

1179

self.send_changedstate()

1085

self._approved = value

1086

gobject.timeout_add(_timedelta_to_milliseconds

1180

self.approved = value

1181

gobject.timeout_add(timedelta_to_milliseconds

1087

1182

(self.approval_duration),

1088

1183

self._reset_approved)

1089

1184

1132

1227

"D-Bus signal"

1133

1228

return self.need_approval()

1134

1229

1230

# NeRwequest - signal

1231

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

1232

def NewRequest(self, ip):

1233

"""D-Bus signal

1234

Is sent after a client request a password.

1235

"""

1236

pass

1237

1135

1238

## Methods

1136

1239

1137

1240

# Approve - method

1195

1298

access="readwrite")

1196

1299

def ApprovalDuration_dbus_property(self, value=None):

1197

1300

if value is None: # get

1198

return dbus.UInt64(_timedelta_to_milliseconds(

1301

return dbus.UInt64(timedelta_to_milliseconds(

1199

1302

self.approval_duration))

1200

1303

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

1201

1304

1215

1318

def Host_dbus_property(self, value=None):

1216

1319

if value is None: # get

1217

1320

return dbus.String(self.host)

1218

self.host = value

1321

self.host = unicode(value)

1219

1322

1220

1323

# Created - property

1221

1324

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

1222

1325

def Created_dbus_property(self):

1223

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

1326

return datetime_to_dbus(self.created)

1224

1327

1225

1328

# LastEnabled - property

1226

1329

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

1264

1367

if value is None: # get

1265

1368

return dbus.UInt64(self.timeout_milliseconds())

1266

1369

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

1267

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

1268

return

1269

1370

# Reschedule timeout

1270

gobject.source_remove(self.disable_initiator_tag)

1271

self.disable_initiator_tag = None

1272

self.expires = None

1273

time_to_die = _timedelta_to_milliseconds((self

1274

.last_checked_ok

1275

+ self.timeout)

1276

- datetime.datetime

1277

.utcnow())

1278

if time_to_die <= 0:

1279

# The timeout has passed

1280

self.disable()

1281

else:

1282

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

1283

+ datetime.timedelta(milliseconds =

1284

time_to_die))

1285

self.disable_initiator_tag = (gobject.timeout_add

1286

(time_to_die, self.disable))

1371

if self.enabled:

1372

now = datetime.datetime.utcnow()

1373

time_to_die = timedelta_to_milliseconds(

1374

(self.last_checked_ok + self.timeout) - now)

1375

if time_to_die <= 0:

1376

# The timeout has passed

1377

self.disable()

1378

else:

1379

self.expires = (now +

1380

datetime.timedelta(milliseconds =

1381

time_to_die))

1382

if (getattr(self, "disable_initiator_tag", None)

1383

is None):

1384

return

1385

gobject.source_remove(self.disable_initiator_tag)

1386

self.disable_initiator_tag = (gobject.timeout_add

1387

(time_to_die,

1388

self.disable))

1287

1389

1288

1390

# ExtendedTimeout - property

1289

1391

@dbus_service_property(_interface, signature="t",

1302

1404

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

1303

1405

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

1304

1406

return

1305

# Reschedule checker run

1306

gobject.source_remove(self.checker_initiator_tag)

1307

self.checker_initiator_tag = (gobject.timeout_add

1308

(value, self.start_checker))

1309

self.start_checker() # Start one now, too

1407

if self.enabled:

1408

# Reschedule checker run

1409

gobject.source_remove(self.checker_initiator_tag)

1410

self.checker_initiator_tag = (gobject.timeout_add

1411

(value, self.start_checker))

1412

self.start_checker() # Start one now, too

1310

1413

1311

1414

# Checker - property

1312

1415

@dbus_service_property(_interface, signature="s",

1314

1417

def Checker_dbus_property(self, value=None):

1315

1418

if value is None: # get

1316

1419

return dbus.String(self.checker_command)

1317

self.checker_command = value

1420

self.checker_command = unicode(value)

1318

1421

1319

1422

# CheckerRunning - property

1320

1423

@dbus_service_property(_interface, signature="b",

1349

1452

raise KeyError()

1350

1453

1351

1454

def __getattribute__(self, name):

1352

if(name == '_pipe'):

1455

if name == '_pipe':

1353

1456

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

1354

1457

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

1355

1458

data = self._pipe.recv()

1362

1465

return func

1363

1466

1364

1467

def __setattr__(self, name, value):

1365

if(name == '_pipe'):

1468

if name == '_pipe':

1366

1469

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

1367

1470

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

1368

1471

1472

1369

1473

class ClientDBusTransitional(ClientDBus):

1370

1474

__metaclass__ = AlternateDBusNamesMetaclass

1371

1475

1476

1372

1477

class ClientHandler(socketserver.BaseRequestHandler, object):

1373

1478

"""A class to handle client connections.

1374

1479

1442

1547

except KeyError:

1443

1548

return

1444

1549

1550

if self.server.use_dbus:

1551

# Emit D-Bus signal

1552

client.NewRequest(str(self.client_address))

1553

1445

1554

if client.approval_delay:

1446

1555

delay = client.approval_delay

1447

1556

client.approvals_pending += 1

1456

1565

client.Rejected("Disabled")

1457

1566

return

1458

1567

1459

if client._approved or not client.approval_delay:

1568

if client.approved or not client.approval_delay:

1460

1569

#We are approved or approval is disabled

1461

1570

break

1462

elif client._approved is None:

1571

elif client.approved is None:

1463

1572

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

1464

1573

client.name)

1465

1574

if self.server.use_dbus:

1479

1588

time = datetime.datetime.now()

1480

1589

client.changedstate.acquire()

1481

1590

(client.changedstate.wait

1482

(float(client._timedelta_to_milliseconds(delay)

1591

(float(client.timedelta_to_milliseconds(delay)

1483

1592

/ 1000)))

1484

1593

client.changedstate.release()

1485

1594

time2 = datetime.datetime.now()

1584

1693

# Convert the buffer to a Python bytestring

1585

1694

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

1586

1695

# Convert the bytestring to hexadecimal notation

1587

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

1696

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

1588

1697

return hex_fpr

1589

1698

1590

1699

1593

1702

def sub_process_main(self, request, address):

1594

1703

try:

1595

1704

self.finish_request(request, address)

1596

except:

1705

except Exception:

1597

1706

self.handle_error(request, address)

1598

1707

self.close_request(request)

1599

1708

1847

1956

return timevalue

1848

1957

1849

1958

1850

def if_nametoindex(interface):

1851

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

1852

1853

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

1854

global if_nametoindex

1855

try:

1856

if_nametoindex = (ctypes.cdll.LoadLibrary

1857

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

1858

.if_nametoindex)

1859

except (OSError, AttributeError):

1860

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

1861

def if_nametoindex(interface):

1862

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

1863

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

1864

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

1865

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1866

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

1867

interface))

1868

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

1869

ifreq[16:20])[0]

1870

return interface_index

1871

return if_nametoindex(interface)

1872

1873

1874

1959

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

1875

1960

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

1876

1961

1932

2017

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

1933

2018

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

1934

2019

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

1935

dest="restore",

1936

help="Do not restore stored state",

1937

default=True)

1938

2020

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

2021

" state")

2022

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

2023

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

2024

1939

2025

options = parser.parse_args()

1940

2026

1941

2027

if options.check:

1954

2040

"use_dbus": "True",

1955

2041

"use_ipv6": "True",

1956

2042

"debuglevel": "",

2043

"restore": "True",

2044

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

1957

2045

}

1958

2046

1959

2047

# Parse config file for server-global settings

1976

2064

# options, if set.

1977

2065

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

1978

2066

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

1979

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

2067

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

2068

"statedir"):

1980

2069

value = getattr(options, option)

1981

2070

if value is not None:

1982

2071

server_settings[option] = value

1994

2083

debuglevel = server_settings["debuglevel"]

1995

2084

use_dbus = server_settings["use_dbus"]

1996

2085

use_ipv6 = server_settings["use_ipv6"]

2086

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

2087

stored_state_file)

2088

2089

if debug:

2090

initlogger(debug, logging.DEBUG)

2091

else:

2092

if not debuglevel:

2093

initlogger(debug)

2094

else:

2095

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

2096

initlogger(debug, level)

1997

2097

1998

2098

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

1999

2099

syslogger.setFormatter(logging.Formatter

2002

2102

% server_settings["servicename"]))

2003

2103

2004

2104

# Parse config file with clients

2005

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

2006

"extended_timeout": "15m",

2007

"interval": "2m",

2008

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

2009

"host": "",

2010

"approval_delay": "0s",

2011

"approval_duration": "1s",

2012

}

2013

client_config = configparser.SafeConfigParser(client_defaults)

2105

client_config = configparser.SafeConfigParser(Client

2106

.client_defaults)

2014

2107

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

2015

2108

"clients.conf"))

2016

2109

2054

2147

if error[0] != errno.EPERM:

2055

2148

raise error

2056

2149

2057

if not debug and not debuglevel:

2058

logger.setLevel(logging.WARNING)

2059

if debuglevel:

2060

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

2061

logger.setLevel(level)

2062

2063

2150

if debug:

2064

logger.setLevel(logging.DEBUG)

2065

2151

# Enable all possible GnuTLS debugging

2066

2152

2067

2153

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

2080

2166

os.dup2(null, sys.stdin.fileno())

2081

2167

if null > 2:

2082

2168

os.close(null)

2083

else:

2084

# No console logging

2085

logger.removeHandler(console)

2086

2169

2087

2170

# Need to fork before connecting to D-Bus

2088

2171

if not debug:

2089

2172

# Close all input and output, do double fork, etc.

2090

2173

daemon()

2091

2174

2175

gobject.threads_init()

2176

2092

2177

global main_loop

2093

2178

# From the Avahi example code

2094

2179

DBusGMainLoop(set_as_default=True )

2124

2209

client_class = functools.partial(ClientDBusTransitional,

2125

2210

bus = bus)

2126

2211

2127

special_settings = {

2128

# Some settings need to be accessd by special methods;

2129

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

2130

"approved_by_default":

2131

lambda section:

2132

client_config.getboolean(section, "approved_by_default"),

2133

}

2134

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

2135

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

2136

# with exceptions for any special settings as defined above

2137

client_settings = dict((clientname,

2138

dict((setting,

2139

(value if

2140

setting not in special_settings

2141

else special_settings[setting]

2142

(clientname)))

2143

for setting, value

2144

in client_config.items(clientname)))

2145

for clientname in client_config.sections())

2146

2212

client_settings = Client.config_parser(client_config)

2147

2213

old_client_settings = {}

2148

clients_data = []

2149

2150

# Get client data and settings from last running state.

2214

clients_data = {}

2215

2216

# Get client data and settings from last running state.

2151

2217

if server_settings["restore"]:

2152

2218

try:

2153

2219

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

2154

clients_data, old_client_settings = (

2155

pickle.load(stored_state))

2220

clients_data, old_client_settings = (pickle.load

2221

(stored_state))

2156

2222

os.remove(stored_state_path)

2157

2223

except IOError as e:

2158

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

2224

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

2159

2225

.format(e))

2160

2226

if e.errno != errno.ENOENT:

2161

2227

raise

2162

2163

for client in clients_data:

2164

client_name = client["name"]

2165

2166

# Decide which value to use after restoring saved state.

2167

# We have three different values: Old config file,

2168

# new config file, and saved state.

2169

# New config value takes precedence if it differs from old

2170

# config value, otherwise use saved state.

2171

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

2228

except EOFError as e:

2229

logger.warning("Could not load persistent state: "

2230

"EOFError: {0}".format(e))

2231

2232

with PGPEngine() as pgp:

2233

for client_name, client in clients_data.iteritems():

2234

# Decide which value to use after restoring saved state.

2235

# We have three different values: Old config file,

2236

# new config file, and saved state.

2237

# New config value takes precedence if it differs from old

2238

# config value, otherwise use saved state.

2239

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

2240

try:

2241

# For each value in new config, check if it

2242

# differs from the old config value (Except for

2243

# the "secret" attribute)

2244

if (name != "secret" and

2245

value != old_client_settings[client_name]

2246

[name]):

2247

client[name] = value

2248

except KeyError:

2249

pass

2250

2251

# Clients who has passed its expire date can still be

2252

# enabled if its last checker was successful. Clients

2253

# whose checker failed before we stored its state is

2254

# assumed to have failed all checkers during downtime.

2255

if client["enabled"]:

2256

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

2257

if not client["last_checked_ok"]:

2258

logger.warning(

2259

"disabling client {0} - Client never "

2260

"performed a successfull checker"

2261

.format(client["name"]))

2262

client["enabled"] = False

2263

elif client["last_checker_status"] != 0:

2264

logger.warning(

2265

"disabling client {0} - Client "

2266

"last checker failed with error code {1}"

2267

.format(client["name"],

2268

client["last_checker_status"]))

2269

client["enabled"] = False

2270

else:

2271

client["expires"] = (datetime.datetime

2272

.utcnow()

2273

+ client["timeout"])

2274

logger.debug("Last checker succeeded,"

2275

" keeping {0} enabled"

2276

.format(client["name"]))

2172

2277

try:

2173

# For each value in new config, check if it differs

2174

# from the old config value (Except for the "secret"

2175

# attribute)

2176

if (name != "secret" and

2177

value != old_client_settings[client_name][name]):

2178

setattr(client, name, value)

2179

except KeyError:

2180

pass

2181

2182

# Clients who has passed its expire date, can still be enabled

2183

# if its last checker was sucessful. Clients who checkers

2184

# failed before we stored it state is asumed to had failed

2185

# checker during downtime.

2186

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

2187

if ((datetime.datetime.utcnow()

2188

- client["last_checked_ok"]) > client["interval"]):

2189

if client["last_checker_status"] != 0:

2190

client["enabled"] = False

2191

else:

2192

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

2193

+ client["timeout"])

2194

2195

client["changedstate"] = (multiprocessing_manager

2196

.Condition(multiprocessing_manager

2197

.Lock()))

2198

if use_dbus:

2199

new_client = ClientDBusTransitional.__new__(

2200

ClientDBusTransitional)

2201

tcp_server.clients[client_name] = new_client

2202

new_client.bus = bus

2203

for name, value in client.iteritems():

2204

setattr(new_client, name, value)

2205

new_client._approvals_pending = 0

2206

new_client.add_to_dbus()

2207

else:

2208

tcp_server.clients[client_name] = Client.__new__(Client)

2209

for name, value in client.iteritems():

2210

setattr(tcp_server.clients[client_name], name, value)

2211

2212

tcp_server.clients[client_name].decrypt_secret(

2213

client_settings[client_name]["secret"])

2214

2215

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

2216

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

2217

del tcp_server.clients[clientname]

2218

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

2219

tcp_server.clients[clientname] = client_class(name

2220

= clientname,

2221

config =

2222

client_settings

2223

[clientname])

2278

client["secret"] = (

2279

pgp.decrypt(client["encrypted_secret"],

2280

client_settings[client_name]

2281

["secret"]))

2282

except PGPError:

2283

# If decryption fails, we use secret from new settings

2284

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

2285

.format(client_name))

2286

client["secret"] = (

2287

client_settings[client_name]["secret"])

2288

2289

2290

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

2291

for client_name in (set(old_client_settings)

2292

- set(client_settings)):

2293

del clients_data[client_name]

2294

for client_name in (set(client_settings)

2295

- set(old_client_settings)):

2296

clients_data[client_name] = client_settings[client_name]

2297

2298

# Create clients all clients

2299

for client_name, client in clients_data.iteritems():

2300

tcp_server.clients[client_name] = client_class(

2301

name = client_name, settings = client)

2224

2302

2225

2303

if not tcp_server.clients:

2226

2304

logger.warning("No clients defined")

2238

2316

# "pidfile" was never created

2239

2317

pass

2240

2318

del pidfilename

2241

2242

2319

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

2243

2320

2244

2321

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

2309

2386

multiprocessing.active_children()

2310

2387

if not (tcp_server.clients or client_settings):

2311

2388

return

2312

2389

2313

2390

# Store client before exiting. Secrets are encrypted with key

2314

2391

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

2315

2392

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

2316

clients = []

2317

for client in tcp_server.clients.itervalues():

2318

client.encrypt_secret(

2319

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

2320

2321

client_dict = {}

2322

2323

# A list of attributes that will not be stored when

2324

# shutting down.

2325

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

2326

for name, typ in inspect.getmembers(dbus.service.Object):

2327

exclude.add(name)

2328

2329

client_dict["encrypted_secret"] = client.encrypted_secret

2330

for attr in client.client_structure:

2331

if attr not in exclude:

2332

client_dict[attr] = getattr(client, attr)

2333

2334

clients.append(client_dict)

2335

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

2336

2393

clients = {}

2394

with PGPEngine() as pgp:

2395

for client in tcp_server.clients.itervalues():

2396

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

2397

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

2398

key)

2399

client_dict = {}

2400

2401

# A list of attributes that can not be pickled

2402

# + secret.

2403

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

2404

"checker"))

2405

for name, typ in (inspect.getmembers

2406

(dbus.service.Object)):

2407

exclude.add(name)

2408

2409

client_dict["encrypted_secret"] = (client

2410

.encrypted_secret)

2411

for attr in client.client_structure:

2412

if attr not in exclude:

2413

client_dict[attr] = getattr(client, attr)

2414

2415

clients[client.name] = client_dict

2416

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

2417

2337

2418

try:

2338

with os.fdopen(os.open(stored_state_path,

2339

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

2340

stat.S_IRUSR | stat.S_IWUSR),

2341

"wb") as stored_state:

2419

tempfd, tempname = tempfile.mkstemp(suffix=".pickle",

2420

prefix="clients-",

2421

dir=os.path.dirname

2422

(stored_state_path))

2423

with os.fdopen(tempfd, "wb") as stored_state:

2342

2424

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

2343

except IOError as e:

2344

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

2425

os.rename(tempname, stored_state_path)

2426

except (IOError, OSError) as e:

2427

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

2345

2428

.format(e))

2346

if e.errno != errno.ENOENT:

2347

raise

2348

2429

if not debug:

2430

try:

2431

os.remove(tempname)

2432

except NameError:

2433

pass

2434

if e.errno not in set((errno.ENOENT, errno.EACCES,

2435

errno.EEXIST)):

2436

raise e

2437

2349

2438

# Delete all clients, and settings from config

2350

2439

while tcp_server.clients:

2351

2440

name, client = tcp_server.clients.popitem()

2369

2458

# Need to initiate checking of clients

2370

2459

if client.enabled:

2371

2460

client.init_checker()

2372

2373

2461

2374

2462

tcp_server.enable()

2375

2463

tcp_server.server_activate()

2415

2503

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

2416

2504

cleanup()

2417

2505

2418

2419

2506

if __name__ == '__main__':

2420

2507

main()