/mandos/trunk : revision 740

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#!/usr/bin/python

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#!/usr/bin/python2.7

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# -*- mode: python; coding: utf-8 -*-

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#

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# Mandos server - give out binary blobs to connecting clients.

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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 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 = "1.6.0"

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.9"

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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 = None

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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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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struct.pack(b"16s16x", interface))

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interface_index = struct.unpack("I", 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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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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

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' %(message)s'))

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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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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--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 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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encoded = b"mandos" + binascii.hexlify(password)

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if len(encoded) > 2048:

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# GnuPG can't handle long passwords, so encode differently

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encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

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.replace(b"\n", b"\\n")

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.replace(b"\0", b"\\x00"))

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return encoded

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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, "w") 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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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--symmetric',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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ciphertext, err = proc.communicate(input = data)

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if proc.returncode != 0:

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raise PGPError(err)

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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, "w") 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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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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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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self.value = value

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super(AvahiError, self).__init__(value, *args, **kwargs)

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def __unicode__(self):

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return unicode(repr(self.value))

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return super(AvahiError, self).__init__(value, *args,

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**kwargs)

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class AvahiServiceError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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type: string; Example: '_mandos._tcp'.

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See <http://www.dns-sd.org/ServiceTypes.html>

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See <https://www.iana.org/assignments/service-names-port-numbers>

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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domain: string; Domain to publish on, default to .local if empty.

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self.bus = bus

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self.entry_group_state_changed_match = None

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def rename(self):

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def rename(self, remove=True):

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"""Derived from the Avahi example code"""

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if self.rename_count >= self.max_renames:

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logger.critical("No suitable Zeroconf service name found"

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" after %i retries, exiting.",

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self.rename_count)

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raise AvahiServiceError("Too many renames")

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self.name = unicode(self.server

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.GetAlternativeServiceName(self.name))

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self.name = str(self.server

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.GetAlternativeServiceName(self.name))

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self.rename_count += 1

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

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self.name)

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self.remove()

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if remove:

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self.remove()

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try:

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self.add()

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except dbus.exceptions.DBusException as error:

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logger.critical("D-Bus Exception", exc_info=error)

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self.cleanup()

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os._exit(1)

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self.rename_count += 1

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if (error.get_dbus_name()

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== "org.freedesktop.Avahi.CollisionError"):

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logger.info("Local Zeroconf service name collision.")

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return self.rename(remove=False)

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else:

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logger.critical("D-Bus Exception", exc_info=error)

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self.cleanup()

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os._exit(1)

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def remove(self):

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"""Derived from the Avahi example code"""

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self.rename()

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elif state == avahi.ENTRY_GROUP_FAILURE:

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logger.critical("Avahi: Error in group state changed %s",

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unicode(error))

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raise AvahiGroupError("State changed: {0!s}"

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str(error))

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raise AvahiGroupError("State changed: {!s}"

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.format(error))

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def cleanup(self):

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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def rename(self, *args, **kwargs):

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

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ret = AvahiService.rename(self)

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ret = AvahiService.rename(self, *args, **kwargs)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({0}) [%(process)d]:'

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

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

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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

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runtime_expansions: Allowed attributes for runtime expansion.

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expires: datetime.datetime(); time (UTC) when a client will be

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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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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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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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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def approval_delay_milliseconds(self):

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

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"enabled")

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# Uppercase and remove spaces from fingerprint for later

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# comparison purposes with return value from the

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# fingerprint() function

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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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"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 {0}"

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raise TypeError("No secret or secfile for section {}"

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.format(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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return settings

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

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

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.iteritems():

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for setting, value in settings.items():

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setattr(self, setting, value)

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if self.enabled:

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

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

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datetime.datetime.utcnow())

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if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(self.interval_milliseconds(),

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(int(self.interval

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.total_seconds() * 1000),

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self.start_checker))

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

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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(self.timeout_milliseconds(),

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self.disable))

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(int(self.timeout

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.total_seconds() * 1000),

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self.disable))

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# Also start a new checker *right now*.

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self.start_checker()

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self.disable_initiator_tag = None

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

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self.disable_initiator_tag = (gobject.timeout_add

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(timedelta_to_milliseconds

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(timeout), self.disable))

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(int(timeout.total_seconds()

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* 1000), self.disable))

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

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def need_approval(self):

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

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try:

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

683

except (AttributeError, OSError) as error:

684

if (isinstance(error, OSError)

685

and error.errno != errno.ECHILD):

686

raise error

682

except AttributeError:

683

pass

684

except OSError as error:

685

if error.errno != errno.ECHILD:

686

raise

687

else:

688

if pid:

689

logger.warning("Checker was a zombie")

693

# Start a new checker if needed

694

if self.checker is None:

695

# Escape attributes for the shell

696

escaped_attrs = dict(

697

(attr, re.escape(unicode(getattr(self, attr))))

698

for attr in

699

self.runtime_expansions)

696

escaped_attrs = { attr:

697

re.escape(str(getattr(self, attr)))

698

for attr in self.runtime_expansions }

700

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try:

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700

command = self.checker_command % escaped_attrs

702

701

except TypeError as error:

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710

# in normal mode, that is already done by daemon(),

712

711

# and in debug mode we don't want to. (Stdin is

713

712

# always replaced by /dev/null.)

713

# The exception is when not debugging but nevertheless

714

# running in the foreground; use the previously

715

# created wnull.

716

popen_args = {}

717

if (not self.server_settings["debug"]

718

and self.server_settings["foreground"]):

719

popen_args.update({"stdout": wnull,

720

"stderr": wnull })

714

721

self.checker = subprocess.Popen(command,

715

722

close_fds=True,

716

shell=True, cwd="/")

723

shell=True, cwd="/",

724

**popen_args)

717

725

except OSError as error:

718

726

logger.error("Failed to start subprocess",

719

727

exc_info=error)

728

736

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

729

737

except OSError as error:

730

738

if error.errno == errno.ECHILD:

731

logger.error("Child process vanished", exc_info=error)

739

# This should never happen

740

logger.error("Child process vanished",

741

exc_info=error)

732

742

return True

733

743

raise

734

744

if pid:

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782

# "Set" method, so we fail early here:

773

783

if byte_arrays and signature != "ay":

774

784

raise ValueError("Byte arrays not supported for non-'ay'"

775

" signature {0!r}".format(signature))

785

" signature {!r}".format(signature))

776

786

def decorator(func):

777

787

func._dbus_is_property = True

778

788

func._dbus_interface = dbus_interface

809

819

"""Decorator to annotate D-Bus methods, signals or properties

810

820

Usage:

811

821

822

@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true",

823

"org.freedesktop.DBus.Property."

824

"EmitsChangedSignal": "false"})

812

825

@dbus_service_property("org.example.Interface", signature="b",

813

826

access="r")

814

@dbus_annotations({{"org.freedesktop.DBus.Deprecated": "true",

815

"org.freedesktop.DBus.Property."

816

"EmitsChangedSignal": "false"})

817

827

def Property_dbus_property(self):

818

828

return dbus.Boolean(False)

819

829

"""

826

836

class DBusPropertyException(dbus.exceptions.DBusException):

827

837

"""A base class for D-Bus property-related exceptions

828

838

"""

829

def __unicode__(self):

830

return unicode(str(self))

831

839

pass

832

840

833

841

class DBusPropertyAccessException(DBusPropertyException):

834

842

"""A property's access permissions disallows an operation.

857

865

If called like _is_dbus_thing("method") it returns a function

858

866

suitable for use as predicate to inspect.getmembers().

859

867

"""

860

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

868

return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),

861

869

False)

862

870

863

871

def _get_all_dbus_things(self, thing):

912

920

# The byte_arrays option is not supported yet on

913

921

# signatures other than "ay".

914

922

if prop._dbus_signature != "ay":

915

raise ValueError

923

raise ValueError("Byte arrays not supported for non-"

924

"'ay' signature {!r}"

925

.format(prop._dbus_signature))

916

926

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

917

927

for byte in value))

918

928

prop(value)

942

952

value.variant_level+1)

943

953

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

944

954

955

@dbus.service.signal(dbus.PROPERTIES_IFACE, signature="sa{sv}as")

956

def PropertiesChanged(self, interface_name, changed_properties,

957

invalidated_properties):

958

"""Standard D-Bus PropertiesChanged() signal, see D-Bus

959

standard.

960

"""

961

pass

962

945

963

@dbus.service.method(dbus.INTROSPECTABLE_IFACE,

946

964

out_signature="s",

947

965

path_keyword='object_path',

982

1000

(prop,

983

1001

"_dbus_annotations",

984

1002

{}))

985

for name, value in annots.iteritems():

1003

for name, value in annots.items():

986

1004

ann_tag = document.createElement(

987

1005

"annotation")

988

1006

ann_tag.setAttribute("name", name)

991

1009

# Add interface annotation tags

992

1010

for annotation, value in dict(

993

1011

itertools.chain.from_iterable(

994

annotations().iteritems()

1012

annotations().items()

995

1013

for name, annotations in

996

1014

self._get_all_dbus_things("interface")

997

1015

if name == if_tag.getAttribute("name")

998

)).iteritems():

1016

)).items():

999

1017

ann_tag = document.createElement("annotation")

1000

1018

ann_tag.setAttribute("name", annotation)

1001

1019

ann_tag.setAttribute("value", value)

1057

1075

"""

1058

1076

def wrapper(cls):

1059

1077

for orig_interface_name, alt_interface_name in (

1060

alt_interface_names.iteritems()):

1078

alt_interface_names.items()):

1061

1079

attr = {}

1062

1080

interface_names = set()

1063

1081

# Go though all attributes of the class

1076

1094

interface_names.add(alt_interface)

1077

1095

# Is this a D-Bus signal?

1078

1096

if getattr(attribute, "_dbus_is_signal", False):

1079

# Extract the original non-method function by

1080

# black magic

1097

# Extract the original non-method undecorated

1098

# function by black magic

1081

1099

nonmethod_func = (dict(

1082

1100

zip(attribute.func_code.co_freevars,

1083

1101

attribute.__closure__))["func"]

1180

1198

attribute.func_closure)))

1181

1199

if deprecate:

1182

1200

# Deprecate all alternate interfaces

1183

iname="_AlternateDBusNames_interface_annotation{0}"

1201

iname="_AlternateDBusNames_interface_annotation{}"

1184

1202

for interface_name in interface_names:

1185

1203

@dbus_interface_annotations(interface_name)

1186

1204

def func(self):

1195

1213

if interface_names:

1196

1214

# Replace the class with a new subclass of it with

1197

1215

# methods, signals, etc. as created above.

1198

cls = type(b"{0}Alternate".format(cls.__name__),

1216

cls = type(b"{}Alternate".format(cls.__name__),

1199

1217

(cls,), attr)

1200

1218

return cls

1201

1219

return wrapper

1214

1232

runtime_expansions = (Client.runtime_expansions

1215

1233

+ ("dbus_object_path",))

1216

1234

1235

_interface = "se.recompile.Mandos.Client"

1236

1217

1237

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

1218

1238

1219

1239

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

1221

1241

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

1222

1242

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

1223

1243

# the D-Bus

1224

client_object_name = unicode(self.name).translate(

1244

client_object_name = str(self.name).translate(

1225

1245

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

1226

1246

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

1227

1247

self.dbus_object_path = (dbus.ObjectPath

1231

1251

1232

1252

def notifychangeproperty(transform_func,

1233

1253

dbus_name, type_func=lambda x: x,

1234

variant_level=1):

1254

variant_level=1, invalidate_only=False,

1255

_interface=_interface):

1235

1256

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

1236

1257

its changes to DBus.

1237

1258

1242

1263

to the D-Bus. Default: no transform

1243

1264

variant_level: D-Bus variant level. Default: 1

1244

1265

"""

1245

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

1266

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

1246

1267

def setter(self, value):

1247

1268

if hasattr(self, "dbus_object_path"):

1248

1269

if (not hasattr(self, attrname) or

1249

1270

type_func(getattr(self, attrname, None))

1250

1271

!= type_func(value)):

1251

dbus_value = transform_func(type_func(value),

1252

variant_level

1253

=variant_level)

1254

self.PropertyChanged(dbus.String(dbus_name),

1255

dbus_value)

1272

if invalidate_only:

1273

self.PropertiesChanged(_interface,

1274

dbus.Dictionary(),

1275

dbus.Array

1276

((dbus_name,)))

1277

else:

1278

dbus_value = transform_func(type_func(value),

1279

variant_level

1280

=variant_level)

1281

self.PropertyChanged(dbus.String(dbus_name),

1282

dbus_value)

1283

self.PropertiesChanged(_interface,

1284

dbus.Dictionary({

1285

dbus.String(dbus_name):

1286

dbus_value }), dbus.Array())

1256

1287

setattr(self, attrname, value)

1257

1288

1258

1289

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

1278

1309

approval_delay = notifychangeproperty(dbus.UInt64,

1279

1310

"ApprovalDelay",

1280

1311

type_func =

1281

timedelta_to_milliseconds)

1312

lambda td: td.total_seconds()

1313

* 1000)

1282

1314

approval_duration = notifychangeproperty(

1283

1315

dbus.UInt64, "ApprovalDuration",

1284

type_func = timedelta_to_milliseconds)

1316

type_func = lambda td: td.total_seconds() * 1000)

1285

1317

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

1286

1318

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

1287

type_func =

1288

timedelta_to_milliseconds)

1319

type_func = lambda td:

1320

td.total_seconds() * 1000)

1289

1321

extended_timeout = notifychangeproperty(

1290

1322

dbus.UInt64, "ExtendedTimeout",

1291

type_func = timedelta_to_milliseconds)

1323

type_func = lambda td: td.total_seconds() * 1000)

1292

1324

interval = notifychangeproperty(dbus.UInt64,

1293

1325

"Interval",

1294

1326

type_func =

1295

timedelta_to_milliseconds)

1327

lambda td: td.total_seconds()

1328

* 1000)

1296

1329

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

1330

secret = notifychangeproperty(dbus.ByteArray, "Secret",

1331

invalidate_only=True)

1297

1332

1298

1333

del notifychangeproperty

1299

1334

1326

1361

*args, **kwargs)

1327

1362

1328

1363

def start_checker(self, *args, **kwargs):

1329

old_checker = self.checker

1330

if self.checker is not None:

1331

old_checker_pid = self.checker.pid

1332

else:

1333

old_checker_pid = None

1364

old_checker_pid = getattr(self.checker, "pid", None)

1334

1365

r = Client.start_checker(self, *args, **kwargs)

1335

1366

# Only if new checker process was started

1336

1367

if (self.checker is not None

1345

1376

1346

1377

def approve(self, value=True):

1347

1378

self.approved = value

1348

gobject.timeout_add(timedelta_to_milliseconds

1349

(self.approval_duration),

1350

self._reset_approved)

1379

gobject.timeout_add(int(self.approval_duration.total_seconds()

1380

* 1000), self._reset_approved)

1351

1381

self.send_changedstate()

1352

1382

1353

1383

## D-Bus methods, signals & properties

1354

_interface = "se.recompile.Mandos.Client"

1355

1384

1356

1385

## Interfaces

1357

1386

1358

@dbus_interface_annotations(_interface)

1359

def _foo(self):

1360

return { "org.freedesktop.DBus.Property.EmitsChangedSignal":

1361

"false"}

1362

1363

1387

## Signals

1364

1388

1365

1389

# CheckerCompleted - signal

1375

1399

pass

1376

1400

1377

1401

# PropertyChanged - signal

1402

@dbus_annotations({"org.freedesktop.DBus.Deprecated": "true"})

1378

1403

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

1379

1404

def PropertyChanged(self, property, value):

1380

1405

"D-Bus signal"

1456

1481

access="readwrite")

1457

1482

def ApprovalDelay_dbus_property(self, value=None):

1458

1483

if value is None: # get

1459

return dbus.UInt64(self.approval_delay_milliseconds())

1484

return dbus.UInt64(self.approval_delay.total_seconds()

1485

* 1000)

1460

1486

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

1461

1487

1462

1488

# ApprovalDuration - property

1464

1490

access="readwrite")

1465

1491

def ApprovalDuration_dbus_property(self, value=None):

1466

1492

if value is None: # get

1467

return dbus.UInt64(timedelta_to_milliseconds(

1468

self.approval_duration))

1493

return dbus.UInt64(self.approval_duration.total_seconds()

1494

* 1000)

1469

1495

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

1470

1496

1471

1497

# Name - property

1484

1510

def Host_dbus_property(self, value=None):

1485

1511

if value is None: # get

1486

1512

return dbus.String(self.host)

1487

self.host = unicode(value)

1513

self.host = str(value)

1488

1514

1489

1515

# Created - property

1490

1516

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

1537

1563

access="readwrite")

1538

1564

def Timeout_dbus_property(self, value=None):

1539

1565

if value is None: # get

1540

return dbus.UInt64(self.timeout_milliseconds())

1566

return dbus.UInt64(self.timeout.total_seconds() * 1000)

1541

1567

old_timeout = self.timeout

1542

1568

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

1543

1569

# Reschedule disabling

1554

1580

gobject.source_remove(self.disable_initiator_tag)

1555

1581

self.disable_initiator_tag = (

1556

1582

gobject.timeout_add(

1557

timedelta_to_milliseconds(self.expires - now),

1558

self.disable))

1583

int((self.expires - now).total_seconds()

1584

* 1000), self.disable))

1559

1585

1560

1586

# ExtendedTimeout - property

1561

1587

@dbus_service_property(_interface, signature="t",

1562

1588

access="readwrite")

1563

1589

def ExtendedTimeout_dbus_property(self, value=None):

1564

1590

if value is None: # get

1565

return dbus.UInt64(self.extended_timeout_milliseconds())

1591

return dbus.UInt64(self.extended_timeout.total_seconds()

1592

* 1000)

1566

1593

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

1567

1594

1568

1595

# Interval - property

1570

1597

access="readwrite")

1571

1598

def Interval_dbus_property(self, value=None):

1572

1599

if value is None: # get

1573

return dbus.UInt64(self.interval_milliseconds())

1600

return dbus.UInt64(self.interval.total_seconds() * 1000)

1574

1601

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

1575

1602

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

1576

1603

return

1587

1614

def Checker_dbus_property(self, value=None):

1588

1615

if value is None: # get

1589

1616

return dbus.String(self.checker_command)

1590

self.checker_command = unicode(value)

1617

self.checker_command = str(value)

1591

1618

1592

1619

# CheckerRunning - property

1593

1620

@dbus_service_property(_interface, signature="b",

1609

1636

@dbus_service_property(_interface, signature="ay",

1610

1637

access="write", byte_arrays=True)

1611

1638

def Secret_dbus_property(self, value):

1612

self.secret = str(value)

1639

self.secret = bytes(value)

1613

1640

1614

1641

del _interface

1615

1642

1649

1676

def handle(self):

1650

1677

with contextlib.closing(self.server.child_pipe) as child_pipe:

1651

1678

logger.info("TCP connection from: %s",

1652

unicode(self.client_address))

1679

str(self.client_address))

1653

1680

logger.debug("Pipe FD: %d",

1654

1681

self.server.child_pipe.fileno())

1655

1682

1681

1708

logger.debug("Protocol version: %r", line)

1682

1709

try:

1683

1710

if int(line.strip().split()[0]) > 1:

1684

raise RuntimeError

1711

raise RuntimeError(line)

1685

1712

except (ValueError, IndexError, RuntimeError) as error:

1686

1713

logger.error("Unknown protocol version: %s", error)

1687

1714

return

1736

1763

if self.server.use_dbus:

1737

1764

# Emit D-Bus signal

1738

1765

client.NeedApproval(

1739

client.approval_delay_milliseconds(),

1740

client.approved_by_default)

1766

client.approval_delay.total_seconds()

1767

* 1000, client.approved_by_default)

1741

1768

else:

1742

1769

logger.warning("Client %s was not approved",

1743

1770

client.name)

1749

1776

#wait until timeout or approved

1750

1777

time = datetime.datetime.now()

1751

1778

client.changedstate.acquire()

1752

client.changedstate.wait(

1753

float(timedelta_to_milliseconds(delay)

1754

/ 1000))

1779

client.changedstate.wait(delay.total_seconds())

1755

1780

client.changedstate.release()

1756

1781

time2 = datetime.datetime.now()

1757

1782

if (time2 - time) >= delay:

1894

1919

1895

1920

def add_pipe(self, parent_pipe, proc):

1896

1921

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

1897

raise NotImplementedError

1922

raise NotImplementedError()

1898

1923

1899

1924

1900

1925

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1956

1981

try:

1957

1982

self.socket.setsockopt(socket.SOL_SOCKET,

1958

1983

SO_BINDTODEVICE,

1959

str(self.interface + '\0'))

1984

(self.interface + "\0")

1985

.encode("utf-8"))

1960

1986

except socket.error as error:

1961

1987

if error.errno == errno.EPERM:

1962

1988

logger.error("No permission to bind to"

1976

2002

if self.address_family == socket.AF_INET6:

1977

2003

any_address = "::" # in6addr_any

1978

2004

else:

1979

any_address = socket.INADDR_ANY

2005

any_address = "0.0.0.0" # INADDR_ANY

1980

2006

self.server_address = (any_address,

1981

2007

self.server_address[1])

1982

2008

elif not self.server_address[1]:

2165

2191

token_duration = Token(re.compile(r"P"), None,

2166

2192

frozenset((token_year, token_month,

2167

2193

token_day, token_time,

2168

token_week))),

2194

token_week)))

2169

2195

# Define starting values

2170

2196

value = datetime.timedelta() # Value so far

2171

2197

found_token = None

2172

followers = frozenset(token_duration,) # Following valid tokens

2198

followers = frozenset((token_duration,)) # Following valid tokens

2173

2199

s = duration # String left to parse

2174

2200

# Loop until end token is found

2175

2201

while found_token is not token_end:

2222

2248

timevalue = datetime.timedelta(0)

2223

2249

for s in interval.split():

2224

2250

try:

2225

suffix = unicode(s[-1])

2251

suffix = s[-1]

2226

2252

value = int(s[:-1])

2227

2253

if suffix == "d":

2228

2254

delta = datetime.timedelta(value)

2235

2261

elif suffix == "w":

2236

2262

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

2237

2263

else:

2238

raise ValueError("Unknown suffix {0!r}"

2264

raise ValueError("Unknown suffix {!r}"

2239

2265

.format(suffix))

2240

except (ValueError, IndexError) as e:

2266

except IndexError as e:

2241

2267

raise ValueError(*(e.args))

2242

2268

timevalue += delta

2243

2269

return timevalue

2258

2284

# Close all standard open file descriptors

2259

2285

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

2260

2286

if not stat.S_ISCHR(os.fstat(null).st_mode):

2261

raise OSError(errno.ENODEV,

2262

"{0} not a character device"

2287

raise OSError(errno.ENODEV, "{} not a character device"

2263

2288

.format(os.devnull))

2264

2289

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

2265

2290

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

2275

2300

2276

2301

parser = argparse.ArgumentParser()

2277

2302

parser.add_argument("-v", "--version", action="version",

2278

version = "%(prog)s {0}".format(version),

2303

version = "%(prog)s {}".format(version),

2279

2304

help="show version number and exit")

2280

2305

parser.add_argument("-i", "--interface", metavar="IF",

2281

2306

help="Bind to interface IF")

2287

2312

help="Run self-test")

2288

2313

parser.add_argument("--debug", action="store_true",

2289

2314

help="Debug mode; run in foreground and log"

2290

" to terminal")

2315

" to terminal", default=None)

2291

2316

parser.add_argument("--debuglevel", metavar="LEVEL",

2292

2317

help="Debug level for stdout output")

2293

2318

parser.add_argument("--priority", help="GnuTLS"

2300

2325

" files")

2301

2326

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

2302

2327

dest="use_dbus", help="Do not provide D-Bus"

2303

" system bus interface")

2328

" system bus interface", default=None)

2304

2329

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

2305

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

2330

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

2331

default=None)

2306

2332

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

2307

2333

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

2308

" state")

2334

" state", default=None)

2309

2335

parser.add_argument("--socket", type=int,

2310

2336

help="Specify a file descriptor to a network"

2311

2337

" socket to use instead of creating one")

2312

2338

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

2313

2339

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

2314

2340

parser.add_argument("--foreground", action="store_true",

2315

help="Run in foreground")

2341

help="Run in foreground", default=None)

2342

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

2343

dest="zeroconf", help="Do not use Zeroconf",

2344

default=None)

2316

2345

2317

2346

options = parser.parse_args()

2318

2347

2319

2348

if options.check:

2320

2349

import doctest

2321

doctest.testmod()

2322

sys.exit()

2350

fail_count, test_count = doctest.testmod()

2351

sys.exit(os.EX_OK if fail_count == 0 else 1)

2323

2352

2324

2353

# Default values for config file for server-global settings

2325

2354

server_defaults = { "interface": "",

2327

2356

"port": "",

2328

2357

"debug": "False",

2329

2358

"priority":

2330

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

2359

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

2331

2360

"servicename": "Mandos",

2332

2361

"use_dbus": "True",

2333

2362

"use_ipv6": "True",

2336

2365

"socket": "",

2337

2366

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

2338

2367

"foreground": "False",

2368

"zeroconf": "True",

2339

2369

}

2340

2370

2341

2371

# Parse config file for server-global settings

2368

2398

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

2369

2399

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

2370

2400

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

2371

"statedir", "socket", "foreground"):

2401

"statedir", "socket", "foreground", "zeroconf"):

2372

2402

value = getattr(options, option)

2373

2403

if value is not None:

2374

2404

server_settings[option] = value

2375

2405

del options

2376

2406

# Force all strings to be unicode

2377

2407

for option in server_settings.keys():

2378

if type(server_settings[option]) is str:

2379

server_settings[option] = unicode(server_settings[option])

2408

if isinstance(server_settings[option], bytes):

2409

server_settings[option] = (server_settings[option]

2410

.decode("utf-8"))

2411

# Force all boolean options to be boolean

2412

for option in ("debug", "use_dbus", "use_ipv6", "restore",

2413

"foreground", "zeroconf"):

2414

server_settings[option] = bool(server_settings[option])

2380

2415

# Debug implies foreground

2381

2416

if server_settings["debug"]:

2382

2417

server_settings["foreground"] = True

2384

2419

2385

2420

##################################################################

2386

2421

2422

if (not server_settings["zeroconf"] and

2423

not (server_settings["port"]

2424

or server_settings["socket"] != "")):

2425

parser.error("Needs port or socket to work without"

2426

" Zeroconf")

2427

2387

2428

# For convenience

2388

2429

debug = server_settings["debug"]

2389

2430

debuglevel = server_settings["debuglevel"]

2392

2433

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

2393

2434

stored_state_file)

2394

2435

foreground = server_settings["foreground"]

2436

zeroconf = server_settings["zeroconf"]

2395

2437

2396

2438

if debug:

2397

2439

initlogger(debug, logging.DEBUG)

2404

2446

2405

2447

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

2406

2448

syslogger.setFormatter(logging.Formatter

2407

('Mandos ({0}) [%(process)d]:'

2449

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

2408

2450

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

2409

2451

.format(server_settings

2410

2452

["servicename"])))

2418

2460

global mandos_dbus_service

2419

2461

mandos_dbus_service = None

2420

2462

2463

socketfd = None

2464

if server_settings["socket"] != "":

2465

socketfd = server_settings["socket"]

2421

2466

tcp_server = MandosServer((server_settings["address"],

2422

2467

server_settings["port"]),

2423

2468

ClientHandler,

2427

2472

gnutls_priority=

2428

2473

server_settings["priority"],

2429

2474

use_dbus=use_dbus,

2430

socketfd=(server_settings["socket"]

2431

or None))

2475

socketfd=socketfd)

2432

2476

if not foreground:

2433

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

2477

pidfilename = "/run/mandos.pid"

2478

if not os.path.isdir("/run/."):

2479

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

2434

2480

pidfile = None

2435

2481

try:

2436

2482

pidfile = open(pidfilename, "w")

2453

2499

os.setuid(uid)

2454

2500

except OSError as error:

2455

2501

if error.errno != errno.EPERM:

2456

raise error

2502

raise

2457

2503

2458

2504

if debug:

2459

2505

# Enable all possible GnuTLS debugging

2502

2548

use_dbus = False

2503

2549

server_settings["use_dbus"] = False

2504

2550

tcp_server.use_dbus = False

2505

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2506

service = AvahiServiceToSyslog(name =

2507

server_settings["servicename"],

2508

servicetype = "_mandos._tcp",

2509

protocol = protocol, bus = bus)

2510

if server_settings["interface"]:

2511

service.interface = (if_nametoindex

2512

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

2551

if zeroconf:

2552

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2553

service = AvahiServiceToSyslog(name =

2554

server_settings["servicename"],

2555

servicetype = "_mandos._tcp",

2556

protocol = protocol, bus = bus)

2557

if server_settings["interface"]:

2558

service.interface = (if_nametoindex

2559

(server_settings["interface"]

2560

.encode("utf-8")))

2513

2561

2514

2562

global multiprocessing_manager

2515

2563

multiprocessing_manager = multiprocessing.Manager()

2522

2570

old_client_settings = {}

2523

2571

clients_data = {}

2524

2572

2573

# This is used to redirect stdout and stderr for checker processes

2574

global wnull

2575

wnull = open(os.devnull, "w") # A writable /dev/null

2576

# Only used if server is running in foreground but not in debug

2577

# mode

2578

if debug or not foreground:

2579

wnull.close()

2580

2525

2581

# Get client data and settings from last running state.

2526

2582

if server_settings["restore"]:

2527

2583

try:

2531

2587

os.remove(stored_state_path)

2532

2588

except IOError as e:

2533

2589

if e.errno == errno.ENOENT:

2534

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

2590

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

2535

2591

.format(os.strerror(e.errno)))

2536

2592

else:

2537

2593

logger.critical("Could not load persistent state:",

2542

2598

"EOFError:", exc_info=e)

2543

2599

2544

2600

with PGPEngine() as pgp:

2545

for client_name, client in clients_data.iteritems():

2601

for client_name, client in clients_data.items():

2602

# Skip removed clients

2603

if client_name not in client_settings:

2604

continue

2605

2546

2606

# Decide which value to use after restoring saved state.

2547

2607

# We have three different values: Old config file,

2548

2608

# new config file, and saved state.

2569

2629

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

2570

2630

if not client["last_checked_ok"]:

2571

2631

logger.warning(

2572

"disabling client {0} - Client never "

2632

"disabling client {} - Client never "

2573

2633

"performed a successful checker"

2574

2634

.format(client_name))

2575

2635

client["enabled"] = False

2576

2636

elif client["last_checker_status"] != 0:

2577

2637

logger.warning(

2578

"disabling client {0} - Client "

2579

"last checker failed with error code {1}"

2638

"disabling client {} - Client last"

2639

" checker failed with error code {}"

2580

2640

.format(client_name,

2581

2641

client["last_checker_status"]))

2582

2642

client["enabled"] = False

2585

2645

.utcnow()

2586

2646

+ client["timeout"])

2587

2647

logger.debug("Last checker succeeded,"

2588

" keeping {0} enabled"

2648

" keeping {} enabled"

2589

2649

.format(client_name))

2590

2650

try:

2591

2651

client["secret"] = (

2594

2654

["secret"]))

2595

2655

except PGPError:

2596

2656

# If decryption fails, we use secret from new settings

2597

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

2657

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

2598

2658

.format(client_name))

2599

2659

client["secret"] = (

2600

2660

client_settings[client_name]["secret"])

2608

2668

clients_data[client_name] = client_settings[client_name]

2609

2669

2610

2670

# Create all client objects

2611

for client_name, client in clients_data.iteritems():

2671

for client_name, client in clients_data.items():

2612

2672

tcp_server.clients[client_name] = client_class(

2613

name = client_name, settings = client)

2673

name = client_name, settings = client,

2674

server_settings = server_settings)

2614

2675

2615

2676

if not tcp_server.clients:

2616

2677

logger.warning("No clients defined")

2620

2681

try:

2621

2682

with pidfile:

2622

2683

pid = os.getpid()

2623

pidfile.write(str(pid) + "\n".encode("utf-8"))

2684

pidfile.write("{}\n".format(pid).encode("utf-8"))

2624

2685

except IOError:

2625

2686

logger.error("Could not write to file %r with PID %d",

2626

2687

pidfilename, pid)

2672

2733

def GetAllClientsWithProperties(self):

2673

2734

"D-Bus method"

2674

2735

return dbus.Dictionary(

2675

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

2676

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

2736

{ c.dbus_object_path: c.GetAll("")

2737

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

2677

2738

signature="oa{sv}")

2678

2739

2679

2740

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

2696

2757

2697

2758

def cleanup():

2698

2759

"Cleanup function; run on exit"

2699

service.cleanup()

2760

if zeroconf:

2761

service.cleanup()

2700

2762

2701

2763

multiprocessing.active_children()

2764

wnull.close()

2702

2765

if not (tcp_server.clients or client_settings):

2703

2766

return

2704

2767

2715

2778

2716

2779

# A list of attributes that can not be pickled

2717

2780

# + secret.

2718

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

2719

"checker"))

2781

exclude = { "bus", "changedstate", "secret",

2782

"checker", "server_settings" }

2720

2783

for name, typ in (inspect.getmembers

2721

2784

(dbus.service.Object)):

2722

2785

exclude.add(name)

2745

2808

except NameError:

2746

2809

pass

2747

2810

if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):

2748

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

2811

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

2749

2812

.format(os.strerror(e.errno)))

2750

2813

else:

2751

2814

logger.warning("Could not save persistent state:",

2752

2815

exc_info=e)

2753

raise e

2816

raise

2754

2817

2755

2818

# Delete all clients, and settings from config

2756

2819

while tcp_server.clients:

2780

2843

tcp_server.server_activate()

2781

2844

2782

2845

# Find out what port we got

2783

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

2846

if zeroconf:

2847

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

2784

2848

if use_ipv6:

2785

2849

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

2786

2850

" flowinfo %d, scope_id %d",

2792

2856

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

2793

2857

2794

2858

try:

2795

# From the Avahi example code

2796

try:

2797

service.activate()

2798

except dbus.exceptions.DBusException as error:

2799

logger.critical("D-Bus Exception", exc_info=error)

2800

cleanup()

2801

sys.exit(1)

2802

# End of Avahi example code

2859

if zeroconf:

2860

# From the Avahi example code

2861

try:

2862

service.activate()

2863

except dbus.exceptions.DBusException as error:

2864

logger.critical("D-Bus Exception", exc_info=error)

2865

cleanup()

2866

sys.exit(1)

2867

# End of Avahi example code

2803

2868

2804

2869

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

2805

2870

lambda *args, **kwargs: