/mandos/release : revision 237.7.87

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import cPickle as pickle

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import multiprocessing

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import types

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import binascii

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import tempfile

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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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(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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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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.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,

228

dbus.exceptions.DBusException) as e:

331

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)

375

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):

381

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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433

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

434

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

435

"extended_timeout": "15m",

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"interval": "2m",

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

438

"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

442

"enabled": "True",

443

}

318

444

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def timeout_milliseconds(self):

320

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"Return the 'timeout' attribute in milliseconds"

321

return _timedelta_to_milliseconds(self.timeout)

447

return timedelta_to_milliseconds(self.timeout)

322

448

323

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

325

return _timedelta_to_milliseconds(self.extended_timeout)

451

return timedelta_to_milliseconds(self.extended_timeout)

326

452

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453

def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

329

return _timedelta_to_milliseconds(self.interval)

455

return timedelta_to_milliseconds(self.interval)

330

456

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def approval_delay_milliseconds(self):

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return _timedelta_to_milliseconds(self.approval_delay)

333

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

458

return timedelta_to_milliseconds(self.approval_delay)

459

460

@staticmethod

461

def config_parser(config):

462

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

463

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

464

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

465

settings = {}

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for client_name in config.sections():

467

section = dict(config.items(client_name))

468

client = settings[client_name] = {}

469

470

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

471

# Reformat values from string types to Python types

472

client["approved_by_default"] = config.getboolean(

473

client_name, "approved_by_default")

474

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

475

476

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

477

.replace(" ", ""))

478

if "secret" in section:

479

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

480

elif "secfile" in section:

481

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

482

(section["secfile"])),

483

"rb") as secfile:

484

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

485

else:

486

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

487

% section)

488

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

489

client["extended_timeout"] = string_to_delta(

490

section["extended_timeout"])

491

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

492

client["approval_delay"] = string_to_delta(

493

section["approval_delay"])

494

client["approval_duration"] = string_to_delta(

495

section["approval_duration"])

496

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

497

client["last_approval_request"] = None

498

client["last_checked_ok"] = None

499

client["last_checker_status"] = None

500

if client["enabled"]:

501

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

502

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

503

+ client["timeout"])

504

else:

505

client["last_enabled"] = None

506

client["expires"] = None

507

508

return settings

509

510

511

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

335

512

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

336

513

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

337

514

attribute."""

338

515

self.name = name

339

if config is None:

340

config = {}

516

# adding all client settings

517

for setting, value in settings.iteritems():

518

setattr(self, setting, value)

519

341

520

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

342

521

# Uppercase and remove spaces from fingerprint for later

343

522

# comparison purposes with return value from the fingerprint()

344

523

# function

345

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

346

.replace(" ", ""))

347

524

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

348

if "secret" in config:

349

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

350

elif "secfile" in config:

351

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

352

(config["secfile"])),

353

"rb") as secfile:

354

self.secret = secfile.read()

355

else:

356

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

357

% self.name)

358

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

359

self.created = datetime.datetime.utcnow()

360

self.enabled = False

361

self.last_approval_request = None

362

self.last_enabled = None

363

self.last_checked_ok = None

364

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

365

self.extended_timeout = string_to_delta(config

366

["extended_timeout"])

367

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

368

self.disable_hook = disable_hook

525

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

526

527

# attributes specific for this server instance

369

528

self.checker = None

370

529

self.checker_initiator_tag = None

371

530

self.disable_initiator_tag = None

372

self.expires = None

373

531

self.checker_callback_tag = None

374

self.checker_command = config["checker"]

375

532

self.current_checker_command = None

376

self.last_connect = None

377

self._approved = None

378

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

379

True)

533

self.approved = None

380

534

self.approvals_pending = 0

381

self.approval_delay = string_to_delta(

382

config["approval_delay"])

383

self.approval_duration = string_to_delta(

384

config["approval_duration"])

385

535

self.changedstate = (multiprocessing_manager

386

536

.Condition(multiprocessing_manager

387

537

.Lock()))

538

self.client_structure = [attr for attr in

539

self.__dict__.iterkeys()

540

if not attr.startswith("_")]

541

self.client_structure.append("client_structure")

542

543

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

544

lambda obj:

545

isinstance(obj,

546

property)):

547

if not name.startswith("_"):

548

self.client_structure.append(name)

388

549

550

# Send notice to process children that client state has changed

389

551

def send_changedstate(self):

390

self.changedstate.acquire()

391

self.changedstate.notify_all()

392

self.changedstate.release()

552

with self.changedstate:

553

self.changedstate.notify_all()

393

554

394

555

def enable(self):

395

556

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

397

558

# Already enabled

398

559

return

399

560

self.send_changedstate()

400

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

401

# and every interval from then on.

402

self.checker_initiator_tag = (gobject.timeout_add

403

(self.interval_milliseconds(),

404

self.start_checker))

405

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

406

561

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

407

self.disable_initiator_tag = (gobject.timeout_add

408

(self.timeout_milliseconds(),

409

self.disable))

410

562

self.enabled = True

411

563

self.last_enabled = datetime.datetime.utcnow()

412

# Also start a new checker *right now*.

413

self.start_checker()

564

self.init_checker()

414

565

415

566

def disable(self, quiet=True):

416

567

"""Disable this client."""

428

579

gobject.source_remove(self.checker_initiator_tag)

429

580

self.checker_initiator_tag = None

430

581

self.stop_checker()

431

if self.disable_hook:

432

self.disable_hook(self)

433

582

self.enabled = False

434

583

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

435

584

return False

436

585

437

586

def __del__(self):

438

self.disable_hook = None

439

587

self.disable()

440

588

589

def init_checker(self):

590

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

591

# and every interval from then on.

592

self.checker_initiator_tag = (gobject.timeout_add

593

(self.interval_milliseconds(),

594

self.start_checker))

595

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

596

self.disable_initiator_tag = (gobject.timeout_add

597

(self.timeout_milliseconds(),

598

self.disable))

599

# Also start a new checker *right now*.

600

self.start_checker()

601

441

602

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

442

603

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

443

604

self.checker_callback_tag = None

444

605

self.checker = None

445

606

if os.WIFEXITED(condition):

446

exitstatus = os.WEXITSTATUS(condition)

447

if exitstatus == 0:

607

self.last_checker_status = os.WEXITSTATUS(condition)

608

if self.last_checker_status == 0:

448

609

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

449

610

vars(self))

450

611

self.checked_ok()

452

613

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

453

614

vars(self))

454

615

else:

616

self.last_checker_status = -1

455

617

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

456

618

vars(self))

457

619

464

626

if timeout is None:

465

627

timeout = self.timeout

466

628

self.last_checked_ok = datetime.datetime.utcnow()

467

gobject.source_remove(self.disable_initiator_tag)

468

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

469

self.disable_initiator_tag = (gobject.timeout_add

470

(_timedelta_to_milliseconds

471

(timeout), self.disable))

629

if self.disable_initiator_tag is not None:

630

gobject.source_remove(self.disable_initiator_tag)

631

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

632

self.disable_initiator_tag = (gobject.timeout_add

633

(timedelta_to_milliseconds

634

(timeout), self.disable))

635

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

472

636

473

637

def need_approval(self):

474

638

self.last_approval_request = datetime.datetime.utcnow()

689

853

690

854

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

691

855

"""

692

all = {}

856

properties = {}

693

857

for name, prop in self._get_all_dbus_properties():

694

858

if (interface_name

695

859

and interface_name != prop._dbus_interface):

700

864

continue

701

865

value = prop()

702

866

if not hasattr(value, "variant_level"):

703

all[name] = value

867

properties[name] = value

704

868

continue

705

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

706

value.variant_level+1)

707

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

869

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

870

value.variant_level+1)

871

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

708

872

709

873

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

710

874

out_signature="s",

761

925

return dbus.String(dt.isoformat(),

762

926

variant_level=variant_level)

763

927

928

764

929

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

765

930

.__metaclass__):

766

931

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

858

1023

attribute.func_closure)))

859

1024

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

860

1025

1026

861

1027

class ClientDBus(Client, DBusObjectWithProperties):

862

1028

"""A Client class using D-Bus

863

1029

872

1038

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

873

1039

874

1040

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

875

self._approvals_pending = 0

876

1041

self.bus = bus

877

1042

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

1043

self._approvals_pending = 0

1044

1045

self._approvals_pending = 0

878

1046

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

879

1047

# the D-Bus

880

1048

client_object_name = unicode(self.name).translate(

890

1058

variant_level=1):

891

1059

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

892

1060

its changes to DBus.

893

894

transform_fun: Function that takes a value and transforms it

895

to a D-Bus type.

1061

1062

transform_fun: Function that takes a value and a variant_level

1063

and transforms it to a D-Bus type.

896

1064

dbus_name: D-Bus name of the variable

897

1065

type_func: Function that transform the value before sending it

898

1066

to the D-Bus. Default: no transform

905

1073

type_func(getattr(self, attrname, None))

906

1074

!= type_func(value)):

907

1075

dbus_value = transform_func(type_func(value),

908

variant_level)

1076

variant_level

1077

=variant_level)

909

1078

self.PropertyChanged(dbus.String(dbus_name),

910

1079

dbus_value)

911

1080

setattr(self, attrname, value)

929

1098

datetime_to_dbus, "LastApprovalRequest")

930

1099

approved_by_default = notifychangeproperty(dbus.Boolean,

931

1100

"ApprovedByDefault")

932

approval_delay = notifychangeproperty(dbus.UInt16,

1101

approval_delay = notifychangeproperty(dbus.UInt64,

933

1102

"ApprovalDelay",

934

1103

type_func =

935

_timedelta_to_milliseconds)

1104

timedelta_to_milliseconds)

936

1105

approval_duration = notifychangeproperty(

937

dbus.UInt16, "ApprovalDuration",

938

type_func = _timedelta_to_milliseconds)

1106

dbus.UInt64, "ApprovalDuration",

1107

type_func = timedelta_to_milliseconds)

939

1108

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

940

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

1109

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

941

1110

type_func =

942

_timedelta_to_milliseconds)

1111

timedelta_to_milliseconds)

943

1112

extended_timeout = notifychangeproperty(

944

dbus.UInt16, "ExtendedTimeout",

945

type_func = _timedelta_to_milliseconds)

946

interval = notifychangeproperty(dbus.UInt16,

1113

dbus.UInt64, "ExtendedTimeout",

1114

type_func = timedelta_to_milliseconds)

1115

interval = notifychangeproperty(dbus.UInt64,

947

1116

"Interval",

948

1117

type_func =

949

_timedelta_to_milliseconds)

1118

timedelta_to_milliseconds)

950

1119

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

951

1120

952

1121

del notifychangeproperty

994

1163

return r

995

1164

996

1165

def _reset_approved(self):

997

self._approved = None

1166

self.approved = None

998

1167

return False

999

1168

1000

1169

def approve(self, value=True):

1001

1170

self.send_changedstate()

1002

self._approved = value

1003

gobject.timeout_add(_timedelta_to_milliseconds

1171

self.approved = value

1172

gobject.timeout_add(timedelta_to_milliseconds

1004

1173

(self.approval_duration),

1005

1174

self._reset_approved)

1006

1175

1049

1218

"D-Bus signal"

1050

1219

return self.need_approval()

1051

1220

1221

# NeRwequest - signal

1222

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

1223

def NewRequest(self, ip):

1224

"""D-Bus signal

1225

Is sent after a client request a password.

1226

"""

1227

pass

1228

1052

1229

## Methods

1053

1230

1054

1231

# Approve - method

1112

1289

access="readwrite")

1113

1290

def ApprovalDuration_dbus_property(self, value=None):

1114

1291

if value is None: # get

1115

return dbus.UInt64(_timedelta_to_milliseconds(

1292

return dbus.UInt64(timedelta_to_milliseconds(

1116

1293

self.approval_duration))

1117

1294

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

1118

1295

1132

1309

def Host_dbus_property(self, value=None):

1133

1310

if value is None: # get

1134

1311

return dbus.String(self.host)

1135

self.host = value

1312

self.host = unicode(value)

1136

1313

1137

1314

# Created - property

1138

1315

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

1139

1316

def Created_dbus_property(self):

1140

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

1317

return datetime_to_dbus(self.created)

1141

1318

1142

1319

# LastEnabled - property

1143

1320

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

1187

1364

gobject.source_remove(self.disable_initiator_tag)

1188

1365

self.disable_initiator_tag = None

1189

1366

self.expires = None

1190

time_to_die = (self.

1191

_timedelta_to_milliseconds((self

1192

.last_checked_ok

1193

+ self.timeout)

1194

- datetime.datetime

1195

.utcnow()))

1367

time_to_die = timedelta_to_milliseconds((self

1368

.last_checked_ok

1369

+ self.timeout)

1370

- datetime.datetime

1371

.utcnow())

1196

1372

if time_to_die <= 0:

1197

1373

# The timeout has passed

1198

1374

self.disable()

1220

1396

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

1221

1397

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

1222

1398

return

1223

# Reschedule checker run

1224

gobject.source_remove(self.checker_initiator_tag)

1225

self.checker_initiator_tag = (gobject.timeout_add

1226

(value, self.start_checker))

1227

self.start_checker() # Start one now, too

1399

if self.enabled:

1400

# Reschedule checker run

1401

gobject.source_remove(self.checker_initiator_tag)

1402

self.checker_initiator_tag = (gobject.timeout_add

1403

(value, self.start_checker))

1404

self.start_checker() # Start one now, too

1228

1405

1229

1406

# Checker - property

1230

1407

@dbus_service_property(_interface, signature="s",

1232

1409

def Checker_dbus_property(self, value=None):

1233

1410

if value is None: # get

1234

1411

return dbus.String(self.checker_command)

1235

self.checker_command = value

1412

self.checker_command = unicode(value)

1236

1413

1237

1414

# CheckerRunning - property

1238

1415

@dbus_service_property(_interface, signature="b",

1267

1444

raise KeyError()

1268

1445

1269

1446

def __getattribute__(self, name):

1270

if(name == '_pipe'):

1447

if name == '_pipe':

1271

1448

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

1272

1449

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

1273

1450

data = self._pipe.recv()

1280

1457

return func

1281

1458

1282

1459

def __setattr__(self, name, value):

1283

if(name == '_pipe'):

1460

if name == '_pipe':

1284

1461

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

1285

1462

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

1286

1463

1464

1287

1465

class ClientDBusTransitional(ClientDBus):

1288

1466

__metaclass__ = AlternateDBusNamesMetaclass

1289

1467

1468

1290

1469

class ClientHandler(socketserver.BaseRequestHandler, object):

1291

1470

"""A class to handle client connections.

1292

1471

1360

1539

except KeyError:

1361

1540

return

1362

1541

1542

if self.server.use_dbus:

1543

# Emit D-Bus signal

1544

client.NewRequest(str(self.client_address))

1545

1363

1546

if client.approval_delay:

1364

1547

delay = client.approval_delay

1365

1548

client.approvals_pending += 1

1374

1557

client.Rejected("Disabled")

1375

1558

return

1376

1559

1377

if client._approved or not client.approval_delay:

1560

if client.approved or not client.approval_delay:

1378

1561

#We are approved or approval is disabled

1379

1562

break

1380

elif client._approved is None:

1563

elif client.approved is None:

1381

1564

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

1382

1565

client.name)

1383

1566

if self.server.use_dbus:

1394

1577

return

1395

1578

1396

1579

#wait until timeout or approved

1397

#x = float(client

1398

# ._timedelta_to_milliseconds(delay))

1399

1580

time = datetime.datetime.now()

1400

1581

client.changedstate.acquire()

1401

1582

(client.changedstate.wait

1402

(float(client._timedelta_to_milliseconds(delay)

1583

(float(client.timedelta_to_milliseconds(delay)

1403

1584

/ 1000)))

1404

1585

client.changedstate.release()

1405

1586

time2 = datetime.datetime.now()

1430

1611

sent_size += sent

1431

1612

1432

1613

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

1433

# bump the timeout as if seen

1614

# bump the timeout using extended_timeout

1434

1615

client.checked_ok(client.extended_timeout)

1435

1616

if self.server.use_dbus:

1436

1617

# Emit D-Bus signal

1504

1685

# Convert the buffer to a Python bytestring

1505

1686

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

1506

1687

# Convert the bytestring to hexadecimal notation

1507

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

1688

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

1508

1689

return hex_fpr

1509

1690

1510

1691

1513

1694

def sub_process_main(self, request, address):

1514

1695

try:

1515

1696

self.finish_request(request, address)

1516

except:

1697

except Exception:

1517

1698

self.handle_error(request, address)

1518

1699

self.close_request(request)

1519

1700

1520

1701

def process_request(self, request, address):

1521

1702

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

1522

multiprocessing.Process(target = self.sub_process_main,

1523

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

1703

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

1704

args = (request,

1705

address))

1706

proc.start()

1707

return proc

1524

1708

1525

1709

1526

1710

class MultiprocessingMixInWithPipe(MultiprocessingMixIn, object):

1532

1716

"""

1533

1717

parent_pipe, self.child_pipe = multiprocessing.Pipe()

1534

1718

1535

super(MultiprocessingMixInWithPipe,

1536

self).process_request(request, client_address)

1719

proc = MultiprocessingMixIn.process_request(self, request,

1720

client_address)

1537

1721

self.child_pipe.close()

1538

self.add_pipe(parent_pipe)

1722

self.add_pipe(parent_pipe, proc)

1539

1723

1540

def add_pipe(self, parent_pipe):

1724

def add_pipe(self, parent_pipe, proc):

1541

1725

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

1542

1726

raise NotImplementedError

1543

1727

1621

1805

self.enabled = False

1622

1806

self.clients = clients

1623

1807

if self.clients is None:

1624

self.clients = set()

1808

self.clients = {}

1625

1809

self.use_dbus = use_dbus

1626

1810

self.gnutls_priority = gnutls_priority

1627

1811

IPv6_TCPServer.__init__(self, server_address,

1631

1815

def server_activate(self):

1632

1816

if self.enabled:

1633

1817

return socketserver.TCPServer.server_activate(self)

1818

1634

1819

def enable(self):

1635

1820

self.enabled = True

1636

def add_pipe(self, parent_pipe):

1821

1822

def add_pipe(self, parent_pipe, proc):

1637

1823

# Call "handle_ipc" for both data and EOF events

1638

1824

gobject.io_add_watch(parent_pipe.fileno(),

1639

1825

gobject.IO_IN | gobject.IO_HUP,

1640

1826

functools.partial(self.handle_ipc,

1641

1827

parent_pipe =

1642

parent_pipe))

1643

1828

parent_pipe,

1829

proc = proc))

1830

1644

1831

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

1645

client_object=None):

1832

proc = None, client_object=None):

1646

1833

condition_names = {

1647

1834

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

1648

1835

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

1657

1844

for cond, name in

1658

1845

condition_names.iteritems()

1659

1846

if cond & condition)

1660

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

1847

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

1661

1848

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

1849

# Wait for other process to exit

1850

proc.join()

1662

1851

return False

1663

1852

1664

1853

# Read a request from the child

1669

1858

fpr = request[1]

1670

1859

address = request[2]

1671

1860

1672

for c in self.clients:

1861

for c in self.clients.itervalues():

1673

1862

if c.fingerprint == fpr:

1674

1863

client = c

1675

1864

break

1688

1877

functools.partial(self.handle_ipc,

1689

1878

parent_pipe =

1690

1879

parent_pipe,

1880

proc = proc,

1691

1881

client_object =

1692

1882

client))

1693

1883

parent_pipe.send(True)

1758

1948

return timevalue

1759

1949

1760

1950

1761

def if_nametoindex(interface):

1762

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

1763

1764

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

1765

global if_nametoindex

1766

try:

1767

if_nametoindex = (ctypes.cdll.LoadLibrary

1768

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

1769

.if_nametoindex)

1770

except (OSError, AttributeError):

1771

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

1772

def if_nametoindex(interface):

1773

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

1774

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

1775

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

1776

ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

1777

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

1778

interface))

1779

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

1780

ifreq[16:20])[0]

1781

return interface_index

1782

return if_nametoindex(interface)

1783

1784

1785

1951

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

1786

1952

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

1787

1953

1842

2008

" system bus interface")

1843

2009

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

1844

2010

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

2011

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

2012

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

2013

" state")

2014

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

2015

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

2016

1845

2017

options = parser.parse_args()

1846

2018

1847

2019

if options.check:

1860

2032

"use_dbus": "True",

1861

2033

"use_ipv6": "True",

1862

2034

"debuglevel": "",

2035

"restore": "True",

2036

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

1863

2037

}

1864

2038

1865

2039

# Parse config file for server-global settings

1882

2056

# options, if set.

1883

2057

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

1884

2058

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

1885

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

2059

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

2060

"statedir"):

1886

2061

value = getattr(options, option)

1887

2062

if value is not None:

1888

2063

server_settings[option] = value

1900

2075

debuglevel = server_settings["debuglevel"]

1901

2076

use_dbus = server_settings["use_dbus"]

1902

2077

use_ipv6 = server_settings["use_ipv6"]

2078

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

2079

stored_state_file)

2080

2081

if debug:

2082

initlogger(debug, logging.DEBUG)

2083

else:

2084

if not debuglevel:

2085

initlogger(debug)

2086

else:

2087

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

2088

initlogger(debug, level)

1903

2089

1904

2090

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

1905

2091

syslogger.setFormatter(logging.Formatter

1908

2094

% server_settings["servicename"]))

1909

2095

1910

2096

# Parse config file with clients

1911

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

1912

"extended_timeout": "15m",

1913

"interval": "2m",

1914

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

1915

"host": "",

1916

"approval_delay": "0s",

1917

"approval_duration": "1s",

1918

}

1919

client_config = configparser.SafeConfigParser(client_defaults)

2097

client_config = configparser.SafeConfigParser(Client.client_defaults)

1920

2098

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

1921

2099

"clients.conf"))

1922

2100

1960

2138

if error[0] != errno.EPERM:

1961

2139

raise error

1962

2140

1963

if not debug and not debuglevel:

1964

syslogger.setLevel(logging.WARNING)

1965

console.setLevel(logging.WARNING)

1966

if debuglevel:

1967

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

1968

syslogger.setLevel(level)

1969

console.setLevel(level)

1970

1971

2141

if debug:

1972

2142

# Enable all possible GnuTLS debugging

1973

2143

1987

2157

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

1988

2158

if null > 2:

1989

2159

os.close(null)

1990

else:

1991

# No console logging

1992

logger.removeHandler(console)

1993

2160

1994

2161

# Need to fork before connecting to D-Bus

1995

2162

if not debug:

1996

2163

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

1997

2164

daemon()

1998

2165

2166

gobject.threads_init()

2167

1999

2168

global main_loop

2000

2169

# From the Avahi example code

2001

2170

DBusGMainLoop(set_as_default=True )

2015

2184

server_settings["use_dbus"] = False

2016

2185

tcp_server.use_dbus = False

2017

2186

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2018

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

2019

servicetype = "_mandos._tcp",

2020

protocol = protocol, bus = bus)

2187

service = AvahiServiceToSyslog(name =

2188

server_settings["servicename"],

2189

servicetype = "_mandos._tcp",

2190

protocol = protocol, bus = bus)

2021

2191

if server_settings["interface"]:

2022

2192

service.interface = (if_nametoindex

2023

2193

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

2029

2199

if use_dbus:

2030

2200

client_class = functools.partial(ClientDBusTransitional,

2031

2201

bus = bus)

2032

def client_config_items(config, section):

2033

special_settings = {

2034

"approved_by_default":

2035

lambda: config.getboolean(section,

2036

"approved_by_default"),

2037

}

2038

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

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

except EOFError as e:

2220

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

2221

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

2222

2223

with PGPEngine() as pgp:

2224

for client_name, client in clients_data.iteritems():

2225

# Decide which value to use after restoring saved state.

2226

# We have three different values: Old config file,

2227

# new config file, and saved state.

2228

# New config value takes precedence if it differs from old

2229

# config value, otherwise use saved state.

2230

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

2231

try:

2232

# For each value in new config, check if it

2233

# differs from the old config value (Except for

2234

# the "secret" attribute)

2235

if (name != "secret" and

2236

value != old_client_settings[client_name]

2237

[name]):

2238

client[name] = value

2239

except KeyError:

2240

pass

2241

2242

# Clients who has passed its expire date can still be

2243

# enabled if its last checker was successful. Clients

2244

# whose checker failed before we stored its state is

2245

# assumed to have failed all checkers during downtime.

2246

if client["enabled"]:

2247

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

2248

if not client["last_checked_ok"]:

2249

logger.warning(

2250

"disabling client {0} - Client never "

2251

"performed a successfull checker"

2252

.format(client["name"]))

2253

client["enabled"] = False

2254

elif client["last_checker_status"] != 0:

2255

logger.warning(

2256

"disabling client {0} - Client "

2257

"last checker failed with error code {1}"

2258

.format(client["name"],

2259

client["last_checker_status"]))

2260

client["enabled"] = False

2261

else:

2262

client["expires"] = (datetime.datetime

2263

.utcnow()

2264

+ client["timeout"])

2265

2039

2266

try:

2040

yield (name, special_settings[name]())

2041

except KeyError:

2042

yield (name, value)

2043

2044

tcp_server.clients.update(set(

2045

client_class(name = section,

2046

config= dict(client_config_items(

2047

client_config, section)))

2048

for section in client_config.sections()))

2267

client["secret"] = (

2268

pgp.decrypt(client["encrypted_secret"],

2269

client_settings[client_name]

2270

["secret"]))

2271

except PGPError:

2272

# If decryption fails, we use secret from new settings

2273

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

2274

.format(client_name))

2275

client["secret"] = (

2276

client_settings[client_name]["secret"])

2277

2278

2279

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

2280

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

2281

del clients_data[client_name]

2282

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

2283

clients_data[client_name] = client_settings[client_name]

2284

2285

# Create clients all clients

2286

for client_name, client in clients_data.iteritems():

2287

tcp_server.clients[client_name] = client_class(

2288

name = client_name, settings = client)

2289

2049

2290

if not tcp_server.clients:

2050

2291

logger.warning("No clients defined")

2051

2292

2062

2303

# "pidfile" was never created

2063

2304

pass

2064

2305

del pidfilename

2065

2066

2306

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

2067

2307

2068

2308

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

2094

2334

def GetAllClients(self):

2095

2335

"D-Bus method"

2096

2336

return dbus.Array(c.dbus_object_path

2097

for c in tcp_server.clients)

2337

for c in

2338

tcp_server.clients.itervalues())

2098

2339

2099

2340

@dbus.service.method(_interface,

2100

2341

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

2102

2343

"D-Bus method"

2103

2344

return dbus.Dictionary(

2104

2345

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

2105

for c in tcp_server.clients),

2346

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

2106

2347

signature="oa{sv}")

2107

2348

2108

2349

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

2109

2350

def RemoveClient(self, object_path):

2110

2351

"D-Bus method"

2111

for c in tcp_server.clients:

2352

for c in tcp_server.clients.itervalues():

2112

2353

if c.dbus_object_path == object_path:

2113

tcp_server.clients.remove(c)

2354

del tcp_server.clients[c.name]

2114

2355

c.remove_from_connection()

2115

2356

# Don't signal anything except ClientRemoved

2116

2357

c.disable(quiet=True)

2129

2370

"Cleanup function; run on exit"

2130

2371

service.cleanup()

2131

2372

2373

multiprocessing.active_children()

2374

if not (tcp_server.clients or client_settings):

2375

return

2376

2377

# Store client before exiting. Secrets are encrypted with key

2378

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

2379

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

2380

clients = {}

2381

with PGPEngine() as pgp:

2382

for client in tcp_server.clients.itervalues():

2383

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

2384

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

2385

key)

2386

client_dict = {}

2387

2388

# A list of attributes that can not be pickled

2389

# + secret.

2390

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

2391

"checker"))

2392

for name, typ in (inspect.getmembers

2393

(dbus.service.Object)):

2394

exclude.add(name)

2395

2396

client_dict["encrypted_secret"] = (client

2397

.encrypted_secret)

2398

for attr in client.client_structure:

2399

if attr not in exclude:

2400

client_dict[attr] = getattr(client, attr)

2401

2402

clients[client.name] = client_dict

2403

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

2404

2405

try:

2406

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

2407

prefix="clients-",

2408

dir=os.path.dirname

2409

(stored_state_path))

2410

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

2411

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

2412

os.rename(tempname, stored_state_path)

2413

except (IOError, OSError) as e:

2414

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

2415

.format(e))

2416

if not debug:

2417

try:

2418

os.remove(tempname)

2419

except NameError:

2420

pass

2421

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

2422

errno.EEXIST)):

2423

raise e

2424

2425

# Delete all clients, and settings from config

2132

2426

while tcp_server.clients:

2133

client = tcp_server.clients.pop()

2427

name, client = tcp_server.clients.popitem()

2134

2428

if use_dbus:

2135

2429

client.remove_from_connection()

2136

client.disable_hook = None

2137

2430

# Don't signal anything except ClientRemoved

2138

2431

client.disable(quiet=True)

2139

2432

if use_dbus:

2141

2434

mandos_dbus_service.ClientRemoved(client

2142

2435

.dbus_object_path,

2143

2436

client.name)

2437

client_settings.clear()

2144

2438

2145

2439

atexit.register(cleanup)

2146

2440

2147

for client in tcp_server.clients:

2441

for client in tcp_server.clients.itervalues():

2148

2442

if use_dbus:

2149

2443

# Emit D-Bus signal

2150

2444

mandos_dbus_service.ClientAdded(client.dbus_object_path)

2151

client.enable()

2445

# Need to initiate checking of clients

2446

if client.enabled:

2447

client.init_checker()

2152

2448

2153

2449

tcp_server.enable()

2154

2450

tcp_server.server_activate()

2194

2490

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

2195

2491

cleanup()

2196

2492

2197

2198

2493

if __name__ == '__main__':

2199

2494

main()