/mandos/trunk : revision 729

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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 = "1.5.5"

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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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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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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 = {}

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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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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)

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except (AttributeError, OSError) as error:

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if (isinstance(error, OSError)

684

and error.errno != errno.ECHILD):

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raise error

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except AttributeError:

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pass

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except OSError as error:

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if error.errno != errno.ECHILD:

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raise

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else:

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if pid:

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logger.warning("Checker was a zombie")

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# Start a new checker if needed

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if self.checker is None:

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# Escape attributes for the shell

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escaped_attrs = dict(

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

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for attr in

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self.runtime_expansions)

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escaped_attrs = { attr:

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re.escape(unicode(getattr(self,

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attr)))

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for attr in self.runtime_expansions }

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try:

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command = self.checker_command % escaped_attrs

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except TypeError as error:

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

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

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# always replaced by /dev/null.)

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# The exception is when not debugging but nevertheless

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# running in the foreground; use the previously

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# created wnull.

708

popen_args = {}

709

if (not self.server_settings["debug"]

710

and self.server_settings["foreground"]):

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popen_args.update({"stdout": wnull,

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"stderr": wnull })

713

self.checker = subprocess.Popen(command,

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close_fds=True,

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shell=True, cwd="/")

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shell=True, cwd="/",

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**popen_args)

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except OSError as error:

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logger.error("Failed to start subprocess",

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719

exc_info=error)

720

return True

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self.checker_callback_tag = (gobject.child_watch_add

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(self.checker.pid,

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self.checker_callback,

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data=command))

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# The checker may have completed before the gobject

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# watch was added. Check for this.

725

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

727

try:

728

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

729

except OSError as error:

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

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736

if pid:

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gobject.source_remove(self.checker_callback_tag)

728

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self.checker_callback(pid, status, command)

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774

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

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if byte_arrays and signature != "ay":

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

767

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

777

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

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778

def decorator(func):

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779

func._dbus_is_property = True

770

780

func._dbus_interface = dbus_interface

818

828

class DBusPropertyException(dbus.exceptions.DBusException):

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829

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

820

830

"""

821

def __unicode__(self):

822

return unicode(str(self))

823

831

pass

824

832

825

833

class DBusPropertyAccessException(DBusPropertyException):

826

834

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

849

857

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

850

858

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

851

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"""

852

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

860

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

853

861

False)

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862

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863

def _get_all_dbus_things(self, thing):

904

912

# The byte_arrays option is not supported yet on

905

913

# signatures other than "ay".

906

914

if prop._dbus_signature != "ay":

907

raise ValueError

915

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

916

"'ay' signature {!r}"

917

.format(prop._dbus_signature))

908

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

909

919

for byte in value))

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920

prop(value)

974

984

(prop,

975

985

"_dbus_annotations",

976

986

{}))

977

for name, value in annots.iteritems():

987

for name, value in annots.items():

978

988

ann_tag = document.createElement(

979

989

"annotation")

980

990

ann_tag.setAttribute("name", name)

983

993

# Add interface annotation tags

984

994

for annotation, value in dict(

985

995

itertools.chain.from_iterable(

986

annotations().iteritems()

996

annotations().items()

987

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for name, annotations in

988

998

self._get_all_dbus_things("interface")

989

999

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

990

)).iteritems():

1000

)).items():

991

1001

ann_tag = document.createElement("annotation")

992

1002

ann_tag.setAttribute("name", annotation)

993

1003

ann_tag.setAttribute("value", value)

1049

1059

"""

1050

1060

def wrapper(cls):

1051

1061

for orig_interface_name, alt_interface_name in (

1052

alt_interface_names.iteritems()):

1062

alt_interface_names.items()):

1053

1063

attr = {}

1054

1064

interface_names = set()

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# Go though all attributes of the class

1068

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interface_names.add(alt_interface)

1069

1079

# Is this a D-Bus signal?

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1080

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

1071

# Extract the original non-method function by

1072

# black magic

1081

# Extract the original non-method undecorated

1082

# function by black magic

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1083

nonmethod_func = (dict(

1074

1084

zip(attribute.func_code.co_freevars,

1075

1085

attribute.__closure__))["func"]

1172

1182

attribute.func_closure)))

1173

1183

if deprecate:

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1184

# Deprecate all alternate interfaces

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1185

iname="_AlternateDBusNames_interface_annotation{}"

1176

1186

for interface_name in interface_names:

1177

1187

@dbus_interface_annotations(interface_name)

1178

1188

def func(self):

1187

1197

if interface_names:

1188

1198

# Replace the class with a new subclass of it with

1189

1199

# methods, signals, etc. as created above.

1190

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

1200

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

1191

1201

(cls,), attr)

1192

1202

return cls

1193

1203

return wrapper

1234

1244

to the D-Bus. Default: no transform

1235

1245

variant_level: D-Bus variant level. Default: 1

1236

1246

"""

1237

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

1247

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

1238

1248

def setter(self, value):

1239

1249

if hasattr(self, "dbus_object_path"):

1240

1250

if (not hasattr(self, attrname) or

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1280

approval_delay = notifychangeproperty(dbus.UInt64,

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1281

"ApprovalDelay",

1272

1282

type_func =

1273

timedelta_to_milliseconds)

1283

lambda td: td.total_seconds()

1284

* 1000)

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1285

approval_duration = notifychangeproperty(

1275

1286

dbus.UInt64, "ApprovalDuration",

1276

type_func = timedelta_to_milliseconds)

1287

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

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1288

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

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1289

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

1279

type_func =

1280

timedelta_to_milliseconds)

1290

type_func = lambda td:

1291

td.total_seconds() * 1000)

1281

1292

extended_timeout = notifychangeproperty(

1282

1293

dbus.UInt64, "ExtendedTimeout",

1283

type_func = timedelta_to_milliseconds)

1294

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

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1295

interval = notifychangeproperty(dbus.UInt64,

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1296

"Interval",

1286

1297

type_func =

1287

timedelta_to_milliseconds)

1298

lambda td: td.total_seconds()

1299

* 1000)

1288

1300

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

1289

1301

1290

1302

del notifychangeproperty

1318

1330

*args, **kwargs)

1319

1331

1320

1332

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

1333

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

1326

1334

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

1327

1335

# Only if new checker process was started

1328

1336

if (self.checker is not None

1337

1345

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1346

def approve(self, value=True):

1339

1347

self.approved = value

1340

gobject.timeout_add(timedelta_to_milliseconds

1341

(self.approval_duration),

1342

self._reset_approved)

1348

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

1349

* 1000), self._reset_approved)

1343

1350

self.send_changedstate()

1344

1351

1345

1352

## D-Bus methods, signals & properties

1448

1455

access="readwrite")

1449

1456

def ApprovalDelay_dbus_property(self, value=None):

1450

1457

if value is None: # get

1451

return dbus.UInt64(self.approval_delay_milliseconds())

1458

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

1459

* 1000)

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

1453

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# ApprovalDuration - property

1456

1464

access="readwrite")

1457

1465

def ApprovalDuration_dbus_property(self, value=None):

1458

1466

if value is None: # get

1459

return dbus.UInt64(timedelta_to_milliseconds(

1460

self.approval_duration))

1467

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

1468

* 1000)

1461

1469

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

1462

1470

1463

1471

# Name - property

1529

1537

access="readwrite")

1530

1538

def Timeout_dbus_property(self, value=None):

1531

1539

if value is None: # get

1532

return dbus.UInt64(self.timeout_milliseconds())

1540

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

1533

1541

old_timeout = self.timeout

1534

1542

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

1535

1543

# Reschedule disabling

1546

1554

gobject.source_remove(self.disable_initiator_tag)

1547

1555

self.disable_initiator_tag = (

1548

1556

gobject.timeout_add(

1549

timedelta_to_milliseconds(self.expires - now),

1550

self.disable))

1557

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

1558

* 1000), self.disable))

1551

1559

1552

1560

# ExtendedTimeout - property

1553

1561

@dbus_service_property(_interface, signature="t",

1554

1562

access="readwrite")

1555

1563

def ExtendedTimeout_dbus_property(self, value=None):

1556

1564

if value is None: # get

1557

return dbus.UInt64(self.extended_timeout_milliseconds())

1565

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

1566

* 1000)

1558

1567

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

1559

1568

1560

1569

# Interval - property

1562

1571

access="readwrite")

1563

1572

def Interval_dbus_property(self, value=None):

1564

1573

if value is None: # get

1565

return dbus.UInt64(self.interval_milliseconds())

1574

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

1566

1575

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

1567

1576

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

1568

1577

return

1601

1610

@dbus_service_property(_interface, signature="ay",

1602

1611

access="write", byte_arrays=True)

1603

1612

def Secret_dbus_property(self, value):

1604

self.secret = str(value)

1613

self.secret = bytes(value)

1605

1614

1606

1615

del _interface

1607

1616

1673

1682

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

1674

1683

try:

1675

1684

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

1676

raise RuntimeError

1685

raise RuntimeError(line)

1677

1686

except (ValueError, IndexError, RuntimeError) as error:

1678

1687

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

1679

1688

return

1728

1737

if self.server.use_dbus:

1729

1738

# Emit D-Bus signal

1730

1739

client.NeedApproval(

1731

client.approval_delay_milliseconds(),

1732

client.approved_by_default)

1740

client.approval_delay.total_seconds()

1741

* 1000, client.approved_by_default)

1733

1742

else:

1734

1743

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

1735

1744

client.name)

1741

1750

#wait until timeout or approved

1742

1751

time = datetime.datetime.now()

1743

1752

client.changedstate.acquire()

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1753

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

1747

1754

client.changedstate.release()

1748

1755

time2 = datetime.datetime.now()

1749

1756

if (time2 - time) >= delay:

1886

1893

1887

1894

def add_pipe(self, parent_pipe, proc):

1888

1895

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

1889

raise NotImplementedError

1896

raise NotImplementedError()

1890

1897

1891

1898

1892

1899

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1948

1955

try:

1949

1956

self.socket.setsockopt(socket.SOL_SOCKET,

1950

1957

SO_BINDTODEVICE,

1951

str(self.interface

1952

+ '\0'))

1958

(self.interface + "\0")

1959

.encode("utf-8"))

1953

1960

except socket.error as error:

1954

1961

if error.errno == errno.EPERM:

1955

logger.error("No permission to"

1956

" bind to interface %s",

1957

self.interface)

1962

logger.error("No permission to bind to"

1963

" interface %s", self.interface)

1958

1964

elif error.errno == errno.ENOPROTOOPT:

1959

1965

logger.error("SO_BINDTODEVICE not available;"

1960

1966

" cannot bind to interface %s",

1961

1967

self.interface)

1962

1968

elif error.errno == errno.ENODEV:

1963

logger.error("Interface %s does not"

1964

" exist, cannot bind",

1965

self.interface)

1969

logger.error("Interface %s does not exist,"

1970

" cannot bind", self.interface)

1966

1971

else:

1967

1972

raise

1968

1973

# Only bind(2) the socket if we really need to.

1971

1976

if self.address_family == socket.AF_INET6:

1972

1977

any_address = "::" # in6addr_any

1973

1978

else:

1974

any_address = socket.INADDR_ANY

1979

any_address = "0.0.0.0" # INADDR_ANY

1975

1980

self.server_address = (any_address,

1976

1981

self.server_address[1])

1977

1982

elif not self.server_address[1]:

2093

2098

return True

2094

2099

2095

2100

2101

def rfc3339_duration_to_delta(duration):

2102

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

2103

2104

>>> rfc3339_duration_to_delta("P7D")

2105

datetime.timedelta(7)

2106

>>> rfc3339_duration_to_delta("PT60S")

2107

datetime.timedelta(0, 60)

2108

>>> rfc3339_duration_to_delta("PT60M")

2109

datetime.timedelta(0, 3600)

2110

>>> rfc3339_duration_to_delta("PT24H")

2111

datetime.timedelta(1)

2112

>>> rfc3339_duration_to_delta("P1W")

2113

datetime.timedelta(7)

2114

>>> rfc3339_duration_to_delta("PT5M30S")

2115

datetime.timedelta(0, 330)

2116

>>> rfc3339_duration_to_delta("P1DT3M20S")

2117

datetime.timedelta(1, 200)

2118

"""

2119

2120

# Parsing an RFC 3339 duration with regular expressions is not

2121

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

2122

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

2123

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

2124

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

2125

# avoid excessive use of external libraries.

2126

2127

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

2128

Token = collections.namedtuple("Token",

2129

("regexp", # To match token; if

2130

# "value" is not None,

2131

# must have a "group"

2132

# containing digits

2133

"value", # datetime.timedelta or

2134

# None

2135

"followers")) # Tokens valid after

2136

# this token

2137

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

2138

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

2139

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

2140

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

2141

datetime.timedelta(seconds=1),

2142

frozenset((token_end,)))

2143

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

2144

datetime.timedelta(minutes=1),

2145

frozenset((token_second, token_end)))

2146

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

2147

datetime.timedelta(hours=1),

2148

frozenset((token_minute, token_end)))

2149

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

2150

None,

2151

frozenset((token_hour, token_minute,

2152

token_second)))

2153

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

2154

datetime.timedelta(days=1),

2155

frozenset((token_time, token_end)))

2156

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

2157

datetime.timedelta(weeks=4),

2158

frozenset((token_day, token_end)))

2159

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

2160

datetime.timedelta(weeks=52),

2161

frozenset((token_month, token_end)))

2162

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

2163

datetime.timedelta(weeks=1),

2164

frozenset((token_end,)))

2165

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

2166

frozenset((token_year, token_month,

2167

token_day, token_time,

2168

token_week)))

2169

# Define starting values

2170

value = datetime.timedelta() # Value so far

2171

found_token = None

2172

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

2173

s = duration # String left to parse

2174

# Loop until end token is found

2175

while found_token is not token_end:

2176

# Search for any currently valid tokens

2177

for token in followers:

2178

match = token.regexp.match(s)

2179

if match is not None:

2180

# Token found

2181

if token.value is not None:

2182

# Value found, parse digits

2183

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

2184

# Add to value so far

2185

value += factor * token.value

2186

# Strip token from string

2187

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

2188

# Go to found token

2189

found_token = token

2190

# Set valid next tokens

2191

followers = found_token.followers

2192

break

2193

else:

2194

# No currently valid tokens were found

2195

raise ValueError("Invalid RFC 3339 duration")

2196

# End token found

2197

return value

2198

2199

2096

2200

def string_to_delta(interval):

2097

2201

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

2098

2202

2109

2213

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

2110

2214

datetime.timedelta(0, 330)

2111

2215

"""

2216

2217

try:

2218

return rfc3339_duration_to_delta(interval)

2219

except ValueError:

2220

pass

2221

2112

2222

timevalue = datetime.timedelta(0)

2113

2223

for s in interval.split():

2114

2224

try:

2115

suffix = unicode(s[-1])

2225

suffix = s[-1]

2116

2226

value = int(s[:-1])

2117

2227

if suffix == "d":

2118

2228

delta = datetime.timedelta(value)

2125

2235

elif suffix == "w":

2126

2236

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

2127

2237

else:

2128

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

2238

raise ValueError("Unknown suffix {!r}"

2129

2239

.format(suffix))

2130

except (ValueError, IndexError) as e:

2240

except IndexError as e:

2131

2241

raise ValueError(*(e.args))

2132

2242

timevalue += delta

2133

2243

return timevalue

2148

2258

# Close all standard open file descriptors

2149

2259

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

2150

2260

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

2151

raise OSError(errno.ENODEV,

2152

"{0} not a character device"

2261

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

2153

2262

.format(os.devnull))

2154

2263

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

2155

2264

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

2165

2274

2166

2275

parser = argparse.ArgumentParser()

2167

2276

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

2168

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

2277

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

2169

2278

help="show version number and exit")

2170

2279

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

2171

2280

help="Bind to interface IF")

2177

2286

help="Run self-test")

2178

2287

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

2179

2288

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

2180

" to terminal")

2289

" to terminal", default=None)

2181

2290

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

2182

2291

help="Debug level for stdout output")

2183

2292

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

2190

2299

" files")

2191

2300

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

2192

2301

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

2193

" system bus interface")

2302

" system bus interface", default=None)

2194

2303

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

2195

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

2304

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

2305

default=None)

2196

2306

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

2197

2307

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

2198

" state")

2308

" state", default=None)

2199

2309

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

2200

2310

help="Specify a file descriptor to a network"

2201

2311

" socket to use instead of creating one")

2202

2312

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

2203

2313

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

2314

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

2315

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

2316

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

2317

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

2318

default=None)

2204

2319

2205

2320

options = parser.parse_args()

2206

2321

2207

2322

if options.check:

2208

2323

import doctest

2209

doctest.testmod()

2210

sys.exit()

2324

fail_count, test_count = doctest.testmod()

2325

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

2211

2326

2212

2327

# Default values for config file for server-global settings

2213

2328

server_defaults = { "interface": "",

2215

2330

"port": "",

2216

2331

"debug": "False",

2217

2332

"priority":

2218

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

2333

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

2219

2334

"servicename": "Mandos",

2220

2335

"use_dbus": "True",

2221

2336

"use_ipv6": "True",

2222

2337

"debuglevel": "",

2223

2338

"restore": "True",

2224

2339

"socket": "",

2225

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

2340

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

2341

"foreground": "False",

2342

"zeroconf": "True",

2226

2343

}

2227

2344

2228

2345

# Parse config file for server-global settings

2233

2350

# Convert the SafeConfigParser object to a dict

2234

2351

server_settings = server_config.defaults()

2235

2352

# Use the appropriate methods on the non-string config options

2236

for option in ("debug", "use_dbus", "use_ipv6"):

2353

for option in ("debug", "use_dbus", "use_ipv6", "foreground"):

2237

2354

server_settings[option] = server_config.getboolean("DEFAULT",

2238

2355

option)

2239

2356

if server_settings["port"]:

2255

2372

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

2256

2373

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

2257

2374

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

2258

"statedir", "socket"):

2375

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

2259

2376

value = getattr(options, option)

2260

2377

if value is not None:

2261

2378

server_settings[option] = value

2262

2379

del options

2263

2380

# Force all strings to be unicode

2264

2381

for option in server_settings.keys():

2265

if type(server_settings[option]) is str:

2266

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

2382

if isinstance(server_settings[option], bytes):

2383

server_settings[option] = (server_settings[option]

2384

.decode("utf-8"))

2385

# Force all boolean options to be boolean

2386

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

2387

"foreground", "zeroconf"):

2388

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

2389

# Debug implies foreground

2390

if server_settings["debug"]:

2391

server_settings["foreground"] = True

2267

2392

# Now we have our good server settings in "server_settings"

2268

2393

2269

2394

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

2270

2395

2396

if (not server_settings["zeroconf"] and

2397

not (server_settings["port"]

2398

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

2399

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

2400

" Zeroconf")

2401

2271

2402

# For convenience

2272

2403

debug = server_settings["debug"]

2273

2404

debuglevel = server_settings["debuglevel"]

2275

2406

use_ipv6 = server_settings["use_ipv6"]

2276

2407

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

2277

2408

stored_state_file)

2409

foreground = server_settings["foreground"]

2410

zeroconf = server_settings["zeroconf"]

2278

2411

2279

2412

if debug:

2280

2413

initlogger(debug, logging.DEBUG)

2287

2420

2288

2421

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

2289

2422

syslogger.setFormatter(logging.Formatter

2290

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

2423

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

2291

2424

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

2292

2425

.format(server_settings

2293

2426

["servicename"])))

2301

2434

global mandos_dbus_service

2302

2435

mandos_dbus_service = None

2303

2436

2437

socketfd = None

2438

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

2439

socketfd = server_settings["socket"]

2304

2440

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

2305

2441

server_settings["port"]),

2306

2442

ClientHandler,

2310

2446

gnutls_priority=

2311

2447

server_settings["priority"],

2312

2448

use_dbus=use_dbus,

2313

socketfd=(server_settings["socket"]

2314

or None))

2315

if not debug:

2316

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

2449

socketfd=socketfd)

2450

if not foreground:

2451

pidfilename = "/run/mandos.pid"

2452

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

2453

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

2454

pidfile = None

2317

2455

try:

2318

2456

pidfile = open(pidfilename, "w")

2319

2457

except IOError as e:

2335

2473

os.setuid(uid)

2336

2474

except OSError as error:

2337

2475

if error.errno != errno.EPERM:

2338

raise error

2476

raise

2339

2477

2340

2478

if debug:

2341

2479

# Enable all possible GnuTLS debugging

2358

2496

os.close(null)

2359

2497

2360

2498

# Need to fork before connecting to D-Bus

2361

if not debug:

2499

if not foreground:

2362

2500

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

2363

2501

daemon()

2364

2502

2384

2522

use_dbus = False

2385

2523

server_settings["use_dbus"] = False

2386

2524

tcp_server.use_dbus = False

2387

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2388

service = AvahiServiceToSyslog(name =

2389

server_settings["servicename"],

2390

servicetype = "_mandos._tcp",

2391

protocol = protocol, bus = bus)

2392

if server_settings["interface"]:

2393

service.interface = (if_nametoindex

2394

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

2525

if zeroconf:

2526

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2527

service = AvahiServiceToSyslog(name =

2528

server_settings["servicename"],

2529

servicetype = "_mandos._tcp",

2530

protocol = protocol, bus = bus)

2531

if server_settings["interface"]:

2532

service.interface = (if_nametoindex

2533

(server_settings["interface"]

2534

.encode("utf-8")))

2395

2535

2396

2536

global multiprocessing_manager

2397

2537

multiprocessing_manager = multiprocessing.Manager()

2404

2544

old_client_settings = {}

2405

2545

clients_data = {}

2406

2546

2547

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

2548

global wnull

2549

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

2550

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

2551

# mode

2552

if debug or not foreground:

2553

wnull.close()

2554

2407

2555

# Get client data and settings from last running state.

2408

2556

if server_settings["restore"]:

2409

2557

try:

2413

2561

os.remove(stored_state_path)

2414

2562

except IOError as e:

2415

2563

if e.errno == errno.ENOENT:

2416

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

2564

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

2417

2565

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

2418

2566

else:

2419

2567

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

2424

2572

"EOFError:", exc_info=e)

2425

2573

2426

2574

with PGPEngine() as pgp:

2427

for client_name, client in clients_data.iteritems():

2575

for client_name, client in clients_data.items():

2576

# Skip removed clients

2577

if client_name not in client_settings:

2578

continue

2579

2428

2580

# Decide which value to use after restoring saved state.

2429

2581

# We have three different values: Old config file,

2430

2582

# new config file, and saved state.

2451

2603

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

2452

2604

if not client["last_checked_ok"]:

2453

2605

logger.warning(

2454

"disabling client {0} - Client never "

2606

"disabling client {} - Client never "

2455

2607

"performed a successful checker"

2456

2608

.format(client_name))

2457

2609

client["enabled"] = False

2458

2610

elif client["last_checker_status"] != 0:

2459

2611

logger.warning(

2460

"disabling client {0} - Client "

2461

"last checker failed with error code {1}"

2612

"disabling client {} - Client last"

2613

" checker failed with error code {}"

2462

2614

.format(client_name,

2463

2615

client["last_checker_status"]))

2464

2616

client["enabled"] = False

2467

2619

.utcnow()

2468

2620

+ client["timeout"])

2469

2621

logger.debug("Last checker succeeded,"

2470

" keeping {0} enabled"

2622

" keeping {} enabled"

2471

2623

.format(client_name))

2472

2624

try:

2473

2625

client["secret"] = (

2476

2628

["secret"]))

2477

2629

except PGPError:

2478

2630

# If decryption fails, we use secret from new settings

2479

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

2631

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

2480

2632

.format(client_name))

2481

2633

client["secret"] = (

2482

2634

client_settings[client_name]["secret"])

2490

2642

clients_data[client_name] = client_settings[client_name]

2491

2643

2492

2644

# Create all client objects

2493

for client_name, client in clients_data.iteritems():

2645

for client_name, client in clients_data.items():

2494

2646

tcp_server.clients[client_name] = client_class(

2495

name = client_name, settings = client)

2647

name = client_name, settings = client,

2648

server_settings = server_settings)

2496

2649

2497

2650

if not tcp_server.clients:

2498

2651

logger.warning("No clients defined")

2499

2652

2500

if not debug:

2501

try:

2502

with pidfile:

2503

pid = os.getpid()

2504

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

2505

del pidfile

2506

except IOError:

2507

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

2508

pidfilename, pid)

2509

except NameError:

2510

# "pidfile" was never created

2511

pass

2653

if not foreground:

2654

if pidfile is not None:

2655

try:

2656

with pidfile:

2657

pid = os.getpid()

2658

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

2659

except IOError:

2660

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

2661

pidfilename, pid)

2662

del pidfile

2512

2663

del pidfilename

2513

2664

2514

2665

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

2580

2731

2581

2732

def cleanup():

2582

2733

"Cleanup function; run on exit"

2583

service.cleanup()

2734

if zeroconf:

2735

service.cleanup()

2584

2736

2585

2737

multiprocessing.active_children()

2738

wnull.close()

2586

2739

if not (tcp_server.clients or client_settings):

2587

2740

return

2588

2741

2599

2752

2600

2753

# A list of attributes that can not be pickled

2601

2754

# + secret.

2602

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

2603

"checker"))

2755

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

2756

"checker", "server_settings" }

2604

2757

for name, typ in (inspect.getmembers

2605

2758

(dbus.service.Object)):

2606

2759

exclude.add(name)

2629

2782

except NameError:

2630

2783

pass

2631

2784

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

2632

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

2785

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

2633

2786

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

2634

2787

else:

2635

2788

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

2636

2789

exc_info=e)

2637

raise e

2790

raise

2638

2791

2639

2792

# Delete all clients, and settings from config

2640

2793

while tcp_server.clients:

2664

2817

tcp_server.server_activate()

2665

2818

2666

2819

# Find out what port we got

2667

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

2820

if zeroconf:

2821

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

2668

2822

if use_ipv6:

2669

2823

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

2670

2824

" flowinfo %d, scope_id %d",

2676

2830

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

2677

2831

2678

2832

try:

2679

# From the Avahi example code

2680

try:

2681

service.activate()

2682

except dbus.exceptions.DBusException as error:

2683

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

2684

cleanup()

2685

sys.exit(1)

2686

# End of Avahi example code

2833

if zeroconf:

2834

# From the Avahi example code

2835

try:

2836

service.activate()

2837

except dbus.exceptions.DBusException as error:

2838

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

2839

cleanup()

2840

sys.exit(1)

2841

# End of Avahi example code

2687

2842

2688

2843

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

2689

2844

lambda *args, **kwargs: