/mandos/release : revision 237.7.278

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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 binascii

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import tempfile

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import itertools

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import collections

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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 = "1.6.0"

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if sys.version_info.major == 2:

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str = unicode

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version = "1.6.8"

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

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self.name)

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self.remove()

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

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({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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"fingerprint", "host", "interval",

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"last_approval_request", "last_checked_ok",

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

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

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"extended_timeout": "15m",

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"interval": "2m",

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"host": "",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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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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"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 = {}

515

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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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

620

(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

659

(timeout), self.disable))

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(int(timeout.total_seconds()

653

* 1000), self.disable))

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

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655

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def need_approval(self):

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673

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

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try:

681

675

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

682

except (AttributeError, OSError) as error:

683

if (isinstance(error, OSError)

684

and error.errno != errno.ECHILD):

685

raise error

676

except AttributeError:

677

pass

678

except OSError as error:

679

if error.errno != errno.ECHILD:

680

raise

686

681

else:

687

682

if pid:

688

683

logger.warning("Checker was a zombie")

692

687

# Start a new checker if needed

693

688

if self.checker is None:

694

689

# Escape attributes for the shell

695

escaped_attrs = dict(

696

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

697

for attr in

698

self.runtime_expansions)

690

escaped_attrs = { attr:

691

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

692

for attr in self.runtime_expansions }

699

693

try:

700

694

command = self.checker_command % escaped_attrs

701

695

except TypeError as error:

710

704

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

711

705

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

712

706

# always replaced by /dev/null.)

707

# The exception is when not debugging but nevertheless

708

# running in the foreground; use the previously

709

# created wnull.

710

popen_args = {}

711

if (not self.server_settings["debug"]

712

and self.server_settings["foreground"]):

713

popen_args.update({"stdout": wnull,

714

"stderr": wnull })

713

715

self.checker = subprocess.Popen(command,

714

716

close_fds=True,

715

shell=True, cwd="/")

717

shell=True, cwd="/",

718

**popen_args)

716

719

except OSError as error:

717

720

logger.error("Failed to start subprocess",

718

721

exc_info=error)

722

return True

719

723

self.checker_callback_tag = (gobject.child_watch_add

720

724

(self.checker.pid,

721

725

self.checker_callback,

722

726

data=command))

723

727

# The checker may have completed before the gobject

724

728

# watch was added. Check for this.

725

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

729

try:

730

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

731

except OSError as error:

732

if error.errno == errno.ECHILD:

733

# This should never happen

734

logger.error("Child process vanished",

735

exc_info=error)

736

return True

737

raise

726

738

if pid:

727

739

gobject.source_remove(self.checker_callback_tag)

728

740

self.checker_callback(pid, status, command)

764

776

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

765

777

if byte_arrays and signature != "ay":

766

778

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

767

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

779

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

768

780

def decorator(func):

769

781

func._dbus_is_property = True

770

782

func._dbus_interface = dbus_interface

818

830

class DBusPropertyException(dbus.exceptions.DBusException):

819

831

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

820

832

"""

821

def __unicode__(self):

822

return unicode(str(self))

823

833

pass

824

834

825

835

class DBusPropertyAccessException(DBusPropertyException):

826

836

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

849

859

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

850

860

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

851

861

"""

852

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

862

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

853

863

False)

854

864

855

865

def _get_all_dbus_things(self, thing):

904

914

# The byte_arrays option is not supported yet on

905

915

# signatures other than "ay".

906

916

if prop._dbus_signature != "ay":

907

raise ValueError

917

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

918

"'ay' signature {!r}"

919

.format(prop._dbus_signature))

908

920

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

909

921

for byte in value))

910

922

prop(value)

974

986

(prop,

975

987

"_dbus_annotations",

976

988

{}))

977

for name, value in annots.iteritems():

989

for name, value in annots.items():

978

990

ann_tag = document.createElement(

979

991

"annotation")

980

992

ann_tag.setAttribute("name", name)

983

995

# Add interface annotation tags

984

996

for annotation, value in dict(

985

997

itertools.chain.from_iterable(

986

annotations().iteritems()

998

annotations().items()

987

999

for name, annotations in

988

1000

self._get_all_dbus_things("interface")

989

1001

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

990

)).iteritems():

1002

)).items():

991

1003

ann_tag = document.createElement("annotation")

992

1004

ann_tag.setAttribute("name", annotation)

993

1005

ann_tag.setAttribute("value", value)

1049

1061

"""

1050

1062

def wrapper(cls):

1051

1063

for orig_interface_name, alt_interface_name in (

1052

alt_interface_names.iteritems()):

1064

alt_interface_names.items()):

1053

1065

attr = {}

1054

1066

interface_names = set()

1055

1067

# Go though all attributes of the class

1068

1080

interface_names.add(alt_interface)

1069

1081

# Is this a D-Bus signal?

1070

1082

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

1071

# Extract the original non-method function by

1072

# black magic

1083

# Extract the original non-method undecorated

1084

# function by black magic

1073

1085

nonmethod_func = (dict(

1074

1086

zip(attribute.func_code.co_freevars,

1075

1087

attribute.__closure__))["func"]

1172

1184

attribute.func_closure)))

1173

1185

if deprecate:

1174

1186

# Deprecate all alternate interfaces

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1187

iname="_AlternateDBusNames_interface_annotation{}"

1176

1188

for interface_name in interface_names:

1177

1189

@dbus_interface_annotations(interface_name)

1178

1190

def func(self):

1187

1199

if interface_names:

1188

1200

# Replace the class with a new subclass of it with

1189

1201

# methods, signals, etc. as created above.

1190

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

1202

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

1191

1203

(cls,), attr)

1192

1204

return cls

1193

1205

return wrapper

1213

1225

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

1214

1226

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

1215

1227

# the D-Bus

1216

client_object_name = unicode(self.name).translate(

1228

client_object_name = str(self.name).translate(

1217

1229

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

1218

1230

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

1219

1231

self.dbus_object_path = (dbus.ObjectPath

1234

1246

to the D-Bus. Default: no transform

1235

1247

variant_level: D-Bus variant level. Default: 1

1236

1248

"""

1237

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

1249

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

1238

1250

def setter(self, value):

1239

1251

if hasattr(self, "dbus_object_path"):

1240

1252

if (not hasattr(self, attrname) or

1270

1282

approval_delay = notifychangeproperty(dbus.UInt64,

1271

1283

"ApprovalDelay",

1272

1284

type_func =

1273

timedelta_to_milliseconds)

1285

lambda td: td.total_seconds()

1286

* 1000)

1274

1287

approval_duration = notifychangeproperty(

1275

1288

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

1289

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

1277

1290

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

1278

1291

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

1279

type_func =

1280

timedelta_to_milliseconds)

1292

type_func = lambda td:

1293

td.total_seconds() * 1000)

1281

1294

extended_timeout = notifychangeproperty(

1282

1295

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1296

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

1284

1297

interval = notifychangeproperty(dbus.UInt64,

1285

1298

"Interval",

1286

1299

type_func =

1287

timedelta_to_milliseconds)

1300

lambda td: td.total_seconds()

1301

* 1000)

1288

1302

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

1289

1303

1290

1304

del notifychangeproperty

1318

1332

*args, **kwargs)

1319

1333

1320

1334

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

1321

old_checker = self.checker

1322

if self.checker is not None:

1323

old_checker_pid = self.checker.pid

1324

else:

1325

old_checker_pid = None

1335

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

1326

1336

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

1327

1337

# Only if new checker process was started

1328

1338

if (self.checker is not None

1337

1347

1338

1348

def approve(self, value=True):

1339

1349

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1341

(self.approval_duration),

1342

self._reset_approved)

1350

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

1351

* 1000), self._reset_approved)

1343

1352

self.send_changedstate()

1344

1353

1345

1354

## D-Bus methods, signals & properties

1448

1457

access="readwrite")

1449

1458

def ApprovalDelay_dbus_property(self, value=None):

1450

1459

if value is None: # get

1451

return dbus.UInt64(self.approval_delay_milliseconds())

1460

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

1461

* 1000)

1452

1462

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

1453

1463

1454

1464

# ApprovalDuration - property

1456

1466

access="readwrite")

1457

1467

def ApprovalDuration_dbus_property(self, value=None):

1458

1468

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

1460

self.approval_duration))

1469

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

1470

* 1000)

1461

1471

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

1462

1472

1463

1473

# Name - property

1476

1486

def Host_dbus_property(self, value=None):

1477

1487

if value is None: # get

1478

1488

return dbus.String(self.host)

1479

self.host = unicode(value)

1489

self.host = str(value)

1480

1490

1481

1491

# Created - property

1482

1492

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

1529

1539

access="readwrite")

1530

1540

def Timeout_dbus_property(self, value=None):

1531

1541

if value is None: # get

1532

return dbus.UInt64(self.timeout_milliseconds())

1542

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

1533

1543

old_timeout = self.timeout

1534

1544

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

1535

1545

# Reschedule disabling

1546

1556

gobject.source_remove(self.disable_initiator_tag)

1547

1557

self.disable_initiator_tag = (

1548

1558

gobject.timeout_add(

1549

timedelta_to_milliseconds(self.expires - now),

1550

self.disable))

1559

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

1560

* 1000), self.disable))

1551

1561

1552

1562

# ExtendedTimeout - property

1553

1563

@dbus_service_property(_interface, signature="t",

1554

1564

access="readwrite")

1555

1565

def ExtendedTimeout_dbus_property(self, value=None):

1556

1566

if value is None: # get

1557

return dbus.UInt64(self.extended_timeout_milliseconds())

1567

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

1568

* 1000)

1558

1569

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

1559

1570

1560

1571

# Interval - property

1562

1573

access="readwrite")

1563

1574

def Interval_dbus_property(self, value=None):

1564

1575

if value is None: # get

1565

return dbus.UInt64(self.interval_milliseconds())

1576

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

1566

1577

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

1567

1578

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

1568

1579

return

1579

1590

def Checker_dbus_property(self, value=None):

1580

1591

if value is None: # get

1581

1592

return dbus.String(self.checker_command)

1582

self.checker_command = unicode(value)

1593

self.checker_command = str(value)

1583

1594

1584

1595

# CheckerRunning - property

1585

1596

@dbus_service_property(_interface, signature="b",

1601

1612

@dbus_service_property(_interface, signature="ay",

1602

1613

access="write", byte_arrays=True)

1603

1614

def Secret_dbus_property(self, value):

1604

self.secret = str(value)

1615

self.secret = bytes(value)

1605

1616

1606

1617

del _interface

1607

1618

1641

1652

def handle(self):

1642

1653

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

1643

1654

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

1644

unicode(self.client_address))

1655

str(self.client_address))

1645

1656

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

1646

1657

self.server.child_pipe.fileno())

1647

1658

1673

1684

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

1674

1685

try:

1675

1686

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

1676

raise RuntimeError

1687

raise RuntimeError(line)

1677

1688

except (ValueError, IndexError, RuntimeError) as error:

1678

1689

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

1679

1690

return

1728

1739

if self.server.use_dbus:

1729

1740

# Emit D-Bus signal

1730

1741

client.NeedApproval(

1731

client.approval_delay_milliseconds(),

1732

client.approved_by_default)

1742

client.approval_delay.total_seconds()

1743

* 1000, client.approved_by_default)

1733

1744

else:

1734

1745

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

1735

1746

client.name)

1741

1752

#wait until timeout or approved

1742

1753

time = datetime.datetime.now()

1743

1754

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1755

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

1747

1756

client.changedstate.release()

1748

1757

time2 = datetime.datetime.now()

1749

1758

if (time2 - time) >= delay:

1886

1895

1887

1896

def add_pipe(self, parent_pipe, proc):

1888

1897

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

1889

raise NotImplementedError

1898

raise NotImplementedError()

1890

1899

1891

1900

1892

1901

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1948

1957

try:

1949

1958

self.socket.setsockopt(socket.SOL_SOCKET,

1950

1959

SO_BINDTODEVICE,

1951

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

1960

(self.interface + "\0")

1961

.encode("utf-8"))

1952

1962

except socket.error as error:

1953

1963

if error.errno == errno.EPERM:

1954

1964

logger.error("No permission to bind to"

1968

1978

if self.address_family == socket.AF_INET6:

1969

1979

any_address = "::" # in6addr_any

1970

1980

else:

1971

any_address = socket.INADDR_ANY

1981

any_address = "0.0.0.0" # INADDR_ANY

1972

1982

self.server_address = (any_address,

1973

1983

self.server_address[1])

1974

1984

elif not self.server_address[1]:

2090

2100

return True

2091

2101

2092

2102

2103

def rfc3339_duration_to_delta(duration):

2104

"""Parse an RFC 3339 "duration" and return a datetime.timedelta

2105

2106

>>> rfc3339_duration_to_delta("P7D")

2107

datetime.timedelta(7)

2108

>>> rfc3339_duration_to_delta("PT60S")

2109

datetime.timedelta(0, 60)

2110

>>> rfc3339_duration_to_delta("PT60M")

2111

datetime.timedelta(0, 3600)

2112

>>> rfc3339_duration_to_delta("PT24H")

2113

datetime.timedelta(1)

2114

>>> rfc3339_duration_to_delta("P1W")

2115

datetime.timedelta(7)

2116

>>> rfc3339_duration_to_delta("PT5M30S")

2117

datetime.timedelta(0, 330)

2118

>>> rfc3339_duration_to_delta("P1DT3M20S")

2119

datetime.timedelta(1, 200)

2120

"""

2121

2122

# Parsing an RFC 3339 duration with regular expressions is not

2123

# possible - there would have to be multiple places for the same

2124

# values, like seconds. The current code, while more esoteric, is

2125

# cleaner without depending on a parsing library. If Python had a

2126

# built-in library for parsing we would use it, but we'd like to

2127

# avoid excessive use of external libraries.

2128

2129

# New type for defining tokens, syntax, and semantics all-in-one

2130

Token = collections.namedtuple("Token",

2131

("regexp", # To match token; if

2132

# "value" is not None,

2133

# must have a "group"

2134

# containing digits

2135

"value", # datetime.timedelta or

2136

# None

2137

"followers")) # Tokens valid after

2138

# this token

2139

# RFC 3339 "duration" tokens, syntax, and semantics; taken from

2140

# the "duration" ABNF definition in RFC 3339, Appendix A.

2141

token_end = Token(re.compile(r"$"), None, frozenset())

2142

token_second = Token(re.compile(r"(\d+)S"),

2143

datetime.timedelta(seconds=1),

2144

frozenset((token_end,)))

2145

token_minute = Token(re.compile(r"(\d+)M"),

2146

datetime.timedelta(minutes=1),

2147

frozenset((token_second, token_end)))

2148

token_hour = Token(re.compile(r"(\d+)H"),

2149

datetime.timedelta(hours=1),

2150

frozenset((token_minute, token_end)))

2151

token_time = Token(re.compile(r"T"),

2152

None,

2153

frozenset((token_hour, token_minute,

2154

token_second)))

2155

token_day = Token(re.compile(r"(\d+)D"),

2156

datetime.timedelta(days=1),

2157

frozenset((token_time, token_end)))

2158

token_month = Token(re.compile(r"(\d+)M"),

2159

datetime.timedelta(weeks=4),

2160

frozenset((token_day, token_end)))

2161

token_year = Token(re.compile(r"(\d+)Y"),

2162

datetime.timedelta(weeks=52),

2163

frozenset((token_month, token_end)))

2164

token_week = Token(re.compile(r"(\d+)W"),

2165

datetime.timedelta(weeks=1),

2166

frozenset((token_end,)))

2167

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

2168

frozenset((token_year, token_month,

2169

token_day, token_time,

2170

token_week)))

2171

# Define starting values

2172

value = datetime.timedelta() # Value so far

2173

found_token = None

2174

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

2175

s = duration # String left to parse

2176

# Loop until end token is found

2177

while found_token is not token_end:

2178

# Search for any currently valid tokens

2179

for token in followers:

2180

match = token.regexp.match(s)

2181

if match is not None:

2182

# Token found

2183

if token.value is not None:

2184

# Value found, parse digits

2185

factor = int(match.group(1), 10)

2186

# Add to value so far

2187

value += factor * token.value

2188

# Strip token from string

2189

s = token.regexp.sub("", s, 1)

2190

# Go to found token

2191

found_token = token

2192

# Set valid next tokens

2193

followers = found_token.followers

2194

break

2195

else:

2196

# No currently valid tokens were found

2197

raise ValueError("Invalid RFC 3339 duration")

2198

# End token found

2199

return value

2200

2201

2093

2202

def string_to_delta(interval):

2094

2203

"""Parse a string and return a datetime.timedelta

2095

2204

2106

2215

>>> string_to_delta('5m 30s')

2107

2216

datetime.timedelta(0, 330)

2108

2217

"""

2218

2219

try:

2220

return rfc3339_duration_to_delta(interval)

2221

except ValueError:

2222

pass

2223

2109

2224

timevalue = datetime.timedelta(0)

2110

2225

for s in interval.split():

2111

2226

try:

2112

suffix = unicode(s[-1])

2227

suffix = s[-1]

2113

2228

value = int(s[:-1])

2114

2229

if suffix == "d":

2115

2230

delta = datetime.timedelta(value)

2122

2237

elif suffix == "w":

2123

2238

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

2124

2239

else:

2125

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

2240

raise ValueError("Unknown suffix {!r}"

2126

2241

.format(suffix))

2127

except (ValueError, IndexError) as e:

2242

except IndexError as e:

2128

2243

raise ValueError(*(e.args))

2129

2244

timevalue += delta

2130

2245

return timevalue

2145

2260

# Close all standard open file descriptors

2146

2261

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

2147

2262

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

2148

raise OSError(errno.ENODEV,

2149

"{0} not a character device"

2263

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

2150

2264

.format(os.devnull))

2151

2265

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

2152

2266

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

2162

2276

2163

2277

parser = argparse.ArgumentParser()

2164

2278

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

2165

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

2279

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

2166

2280

help="show version number and exit")

2167

2281

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

2168

2282

help="Bind to interface IF")

2174

2288

help="Run self-test")

2175

2289

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

2176

2290

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

2177

" to terminal")

2291

" to terminal", default=None)

2178

2292

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

2179

2293

help="Debug level for stdout output")

2180

2294

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

2187

2301

" files")

2188

2302

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

2189

2303

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

2190

" system bus interface")

2304

" system bus interface", default=None)

2191

2305

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

2192

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

2306

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

2307

default=None)

2193

2308

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

2194

2309

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

2195

" state")

2310

" state", default=None)

2196

2311

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

2197

2312

help="Specify a file descriptor to a network"

2198

2313

" socket to use instead of creating one")

2199

2314

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

2200

2315

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

2201

2316

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

2202

help="Run in foreground")

2317

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

2318

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

2319

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

2320

default=None)

2203

2321

2204

2322

options = parser.parse_args()

2205

2323

2206

2324

if options.check:

2207

2325

import doctest

2208

doctest.testmod()

2209

sys.exit()

2326

fail_count, test_count = doctest.testmod()

2327

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

2210

2328

2211

2329

# Default values for config file for server-global settings

2212

2330

server_defaults = { "interface": "",

2214

2332

"port": "",

2215

2333

"debug": "False",

2216

2334

"priority":

2217

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

2335

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

2218

2336

"servicename": "Mandos",

2219

2337

"use_dbus": "True",

2220

2338

"use_ipv6": "True",

2223

2341

"socket": "",

2224

2342

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

2225

2343

"foreground": "False",

2344

"zeroconf": "True",

2226

2345

}

2227

2346

2228

2347

# Parse config file for server-global settings

2255

2374

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

2256

2375

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

2257

2376

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

2258

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

2377

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

2259

2378

value = getattr(options, option)

2260

2379

if value is not None:

2261

2380

server_settings[option] = value

2262

2381

del options

2263

2382

# Force all strings to be unicode

2264

2383

for option in server_settings.keys():

2265

if type(server_settings[option]) is str:

2266

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

2384

if isinstance(server_settings[option], bytes):

2385

server_settings[option] = (server_settings[option]

2386

.decode("utf-8"))

2387

# Force all boolean options to be boolean

2388

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

2389

"foreground", "zeroconf"):

2390

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

2267

2391

# Debug implies foreground

2268

2392

if server_settings["debug"]:

2269

2393

server_settings["foreground"] = True

2271

2395

2272

2396

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

2273

2397

2398

if (not server_settings["zeroconf"] and

2399

not (server_settings["port"]

2400

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

2401

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

2402

" Zeroconf")

2403

2274

2404

# For convenience

2275

2405

debug = server_settings["debug"]

2276

2406

debuglevel = server_settings["debuglevel"]

2279

2409

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

2280

2410

stored_state_file)

2281

2411

foreground = server_settings["foreground"]

2412

zeroconf = server_settings["zeroconf"]

2282

2413

2283

2414

if debug:

2284

2415

initlogger(debug, logging.DEBUG)

2291

2422

2292

2423

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

2293

2424

syslogger.setFormatter(logging.Formatter

2294

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

2425

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

2295

2426

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

2296

2427

.format(server_settings

2297

2428

["servicename"])))

2305

2436

global mandos_dbus_service

2306

2437

mandos_dbus_service = None

2307

2438

2439

socketfd = None

2440

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

2441

socketfd = server_settings["socket"]

2308

2442

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

2309

2443

server_settings["port"]),

2310

2444

ClientHandler,

2314

2448

gnutls_priority=

2315

2449

server_settings["priority"],

2316

2450

use_dbus=use_dbus,

2317

socketfd=(server_settings["socket"]

2318

or None))

2451

socketfd=socketfd)

2319

2452

if not foreground:

2320

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

2453

pidfilename = "/run/mandos.pid"

2454

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

2455

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

2321

2456

pidfile = None

2322

2457

try:

2323

2458

pidfile = open(pidfilename, "w")

2340

2475

os.setuid(uid)

2341

2476

except OSError as error:

2342

2477

if error.errno != errno.EPERM:

2343

raise error

2478

raise

2344

2479

2345

2480

if debug:

2346

2481

# Enable all possible GnuTLS debugging

2389

2524

use_dbus = False

2390

2525

server_settings["use_dbus"] = False

2391

2526

tcp_server.use_dbus = False

2392

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2393

service = AvahiServiceToSyslog(name =

2394

server_settings["servicename"],

2395

servicetype = "_mandos._tcp",

2396

protocol = protocol, bus = bus)

2397

if server_settings["interface"]:

2398

service.interface = (if_nametoindex

2399

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

2527

if zeroconf:

2528

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2529

service = AvahiServiceToSyslog(name =

2530

server_settings["servicename"],

2531

servicetype = "_mandos._tcp",

2532

protocol = protocol, bus = bus)

2533

if server_settings["interface"]:

2534

service.interface = (if_nametoindex

2535

(server_settings["interface"]

2536

.encode("utf-8")))

2400

2537

2401

2538

global multiprocessing_manager

2402

2539

multiprocessing_manager = multiprocessing.Manager()

2409

2546

old_client_settings = {}

2410

2547

clients_data = {}

2411

2548

2549

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

2550

global wnull

2551

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

2552

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

2553

# mode

2554

if debug or not foreground:

2555

wnull.close()

2556

2412

2557

# Get client data and settings from last running state.

2413

2558

if server_settings["restore"]:

2414

2559

try:

2418

2563

os.remove(stored_state_path)

2419

2564

except IOError as e:

2420

2565

if e.errno == errno.ENOENT:

2421

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

2566

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

2422

2567

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

2423

2568

else:

2424

2569

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

2429

2574

"EOFError:", exc_info=e)

2430

2575

2431

2576

with PGPEngine() as pgp:

2432

for client_name, client in clients_data.iteritems():

2577

for client_name, client in clients_data.items():

2578

# Skip removed clients

2579

if client_name not in client_settings:

2580

continue

2581

2433

2582

# Decide which value to use after restoring saved state.

2434

2583

# We have three different values: Old config file,

2435

2584

# new config file, and saved state.

2456

2605

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

2457

2606

if not client["last_checked_ok"]:

2458

2607

logger.warning(

2459

"disabling client {0} - Client never "

2608

"disabling client {} - Client never "

2460

2609

"performed a successful checker"

2461

2610

.format(client_name))

2462

2611

client["enabled"] = False

2463

2612

elif client["last_checker_status"] != 0:

2464

2613

logger.warning(

2465

"disabling client {0} - Client "

2466

"last checker failed with error code {1}"

2614

"disabling client {} - Client last"

2615

" checker failed with error code {}"

2467

2616

.format(client_name,

2468

2617

client["last_checker_status"]))

2469

2618

client["enabled"] = False

2472

2621

.utcnow()

2473

2622

+ client["timeout"])

2474

2623

logger.debug("Last checker succeeded,"

2475

" keeping {0} enabled"

2624

" keeping {} enabled"

2476

2625

.format(client_name))

2477

2626

try:

2478

2627

client["secret"] = (

2481

2630

["secret"]))

2482

2631

except PGPError:

2483

2632

# If decryption fails, we use secret from new settings

2484

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

2633

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

2485

2634

.format(client_name))

2486

2635

client["secret"] = (

2487

2636

client_settings[client_name]["secret"])

2495

2644

clients_data[client_name] = client_settings[client_name]

2496

2645

2497

2646

# Create all client objects

2498

for client_name, client in clients_data.iteritems():

2647

for client_name, client in clients_data.items():

2499

2648

tcp_server.clients[client_name] = client_class(

2500

name = client_name, settings = client)

2649

name = client_name, settings = client,

2650

server_settings = server_settings)

2501

2651

2502

2652

if not tcp_server.clients:

2503

2653

logger.warning("No clients defined")

2507

2657

try:

2508

2658

with pidfile:

2509

2659

pid = os.getpid()

2510

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

2660

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

2511

2661

except IOError:

2512

2662

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

2513

2663

pidfilename, pid)

2583

2733

2584

2734

def cleanup():

2585

2735

"Cleanup function; run on exit"

2586

service.cleanup()

2736

if zeroconf:

2737

service.cleanup()

2587

2738

2588

2739

multiprocessing.active_children()

2740

wnull.close()

2589

2741

if not (tcp_server.clients or client_settings):

2590

2742

return

2591

2743

2602

2754

2603

2755

# A list of attributes that can not be pickled

2604

2756

# + secret.

2605

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

2606

"checker"))

2757

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

2758

"checker", "server_settings" }

2607

2759

for name, typ in (inspect.getmembers

2608

2760

(dbus.service.Object)):

2609

2761

exclude.add(name)

2632

2784

except NameError:

2633

2785

pass

2634

2786

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

2635

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

2787

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

2636

2788

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

2637

2789

else:

2638

2790

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

2639

2791

exc_info=e)

2640

raise e

2792

raise

2641

2793

2642

2794

# Delete all clients, and settings from config

2643

2795

while tcp_server.clients:

2667

2819

tcp_server.server_activate()

2668

2820

2669

2821

# Find out what port we got

2670

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

2822

if zeroconf:

2823

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

2671

2824

if use_ipv6:

2672

2825

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

2673

2826

" flowinfo %d, scope_id %d",

2679

2832

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

2680

2833

2681

2834

try:

2682

# From the Avahi example code

2683

try:

2684

service.activate()

2685

except dbus.exceptions.DBusException as error:

2686

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

2687

cleanup()

2688

sys.exit(1)

2689

# End of Avahi example code

2835

if zeroconf:

2836

# From the Avahi example code

2837

try:

2838

service.activate()

2839

except dbus.exceptions.DBusException as error:

2840

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

2841

cleanup()

2842

sys.exit(1)

2843

# End of Avahi example code

2690

2844

2691

2845

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

2692

2846

lambda *args, **kwargs: