/mandos/trunk : revision 574

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from __future__ import (division, absolute_import, print_function,

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unicode_literals)

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from future_builtins import *

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import SocketServer as socketserver

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import socket

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import argparse

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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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version = "1.5.3"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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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.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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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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def __exit__(self, exc_type, exc_value, traceback):

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def __exit__ (self, exc_type, exc_value, traceback):

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self._cleanup()

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return False

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return b"mandos" + binascii.hexlify(password)

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def encrypt(self, data, password):

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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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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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return ciphertext

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def decrypt(self, data, password):

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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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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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return decrypted_plaintext

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

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

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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

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self.server_state_changed)

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self.server_state_changed(self.server.GetState())

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class AvahiServiceToSyslog(AvahiService):

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def rename(self):

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

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.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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"created", "enabled", "expires",

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"fingerprint", "host", "interval",

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"last_approval_request", "last_checked_ok",

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"created", "enabled", "fingerprint",

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"host", "interval", "last_checked_ok",

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

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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

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"extended_timeout": "15m",

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"interval": "2m",

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

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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return settings

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

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def __init__(self, settings, name = 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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setattr(self, setting, value)

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

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# Already enabled

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return

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self.send_changedstate()

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

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self.enabled = True

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self.last_enabled = datetime.datetime.utcnow()

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self.init_checker()

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self.send_changedstate()

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def disable(self, quiet=True):

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"""Disable this client."""

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if not getattr(self, "enabled", False):

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return False

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if not quiet:

584

self.send_changedstate()

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if not quiet:

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logger.info("Disabling client %s", self.name)

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if getattr(self, "disable_initiator_tag", None) is not None:

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

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = None

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self.expires = None

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if getattr(self, "checker_initiator_tag", None) is not None:

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

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = None

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self.stop_checker()

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self.enabled = False

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if not quiet:

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self.send_changedstate()

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

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return False

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def init_checker(self):

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

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# and every interval from then on.

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if self.checker_initiator_tag is not None:

617

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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self.start_checker))

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

622

if self.disable_initiator_tag is not None:

623

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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timeout = self.timeout

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

660

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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If a checker already exists, leave it running and do

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nothing."""

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# The reason for not killing a running checker is that if we

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# did that, and if a checker (for some reason) started running

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# slowly and taking more than 'interval' time, then the client

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# would inevitably timeout, since no checker would get a

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# chance to run to completion. If we instead leave running

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# did that, then if a checker (for some reason) started

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# running slowly and taking more than 'interval' time, the

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# client would inevitably timeout, since no checker would get

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# a chance to run to completion. If we instead leave running

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664

# checkers alone, the checker would have to take more time

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# than 'timeout' for the client to be disabled, which is as it

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# should be.

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self.current_checker_command)

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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(

701

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

702

for attr in

703

self.runtime_expansions)

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683

try:

705

command = self.checker_command % escaped_attrs

706

except TypeError as error:

707

logger.error('Could not format string "%s"',

708

self.checker_command, exc_info=error)

709

return True # Try again later

684

# In case checker_command has exactly one % operator

685

command = self.checker_command % self.host

686

except TypeError:

687

# Escape attributes for the shell

688

escaped_attrs = dict(

689

(attr,

690

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

691

errors=

692

'replace')))

693

for attr in

694

self.runtime_expansions)

695

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try:

697

command = self.checker_command % escaped_attrs

698

except TypeError as error:

699

logger.error('Could not format string "%s"',

700

self.checker_command, exc_info=error)

701

return True # Try again later

710

702

self.current_checker_command = command

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703

try:

712

704

logger.info("Starting checker %r for %s",

715

707

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

716

708

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

717

709

# always replaced by /dev/null.)

718

# The exception is when not debugging but nevertheless

719

# running in the foreground; use the previously

720

# created wnull.

721

popen_args = {}

722

if (not self.server_settings["debug"]

723

and self.server_settings["foreground"]):

724

popen_args.update({"stdout": wnull,

725

"stderr": wnull })

726

710

self.checker = subprocess.Popen(command,

727

711

close_fds=True,

728

shell=True, cwd="/",

729

**popen_args)

712

shell=True, cwd="/")

713

self.checker_callback_tag = (gobject.child_watch_add

714

(self.checker.pid,

715

self.checker_callback,

716

data=command))

717

# The checker may have completed before the gobject

718

# watch was added. Check for this.

719

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

720

if pid:

721

gobject.source_remove(self.checker_callback_tag)

722

self.checker_callback(pid, status, command)

730

723

except OSError as error:

731

724

logger.error("Failed to start subprocess",

732

725

exc_info=error)

733

return True

734

self.checker_callback_tag = (gobject.child_watch_add

735

(self.checker.pid,

736

self.checker_callback,

737

data=command))

738

# The checker may have completed before the gobject

739

# watch was added. Check for this.

740

try:

741

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

742

except OSError as error:

743

if error.errno == errno.ECHILD:

744

# This should never happen

745

logger.error("Child process vanished",

746

exc_info=error)

747

return True

748

raise

749

if pid:

750

gobject.source_remove(self.checker_callback_tag)

751

self.checker_callback(pid, status, command)

752

726

# Re-run this periodically if run by gobject.timeout_add

753

727

return True

754

728

1005

979

tag.appendChild(ann_tag)

1006

980

# Add interface annotation tags

1007

981

for annotation, value in dict(

1008

itertools.chain.from_iterable(

1009

annotations().iteritems()

1010

for name, annotations in

1011

self._get_all_dbus_things("interface")

1012

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

1013

)).iteritems():

982

itertools.chain(

983

*(annotations().iteritems()

984

for name, annotations in

985

self._get_all_dbus_things("interface")

986

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

987

))).iteritems():

1014

988

ann_tag = document.createElement("annotation")

1015

989

ann_tag.setAttribute("name", annotation)

1016

990

ann_tag.setAttribute("value", value)

1039

1013

return xmlstring

1040

1014

1041

1015

1042

def datetime_to_dbus(dt, variant_level=0):

1016

def datetime_to_dbus (dt, variant_level=0):

1043

1017

"""Convert a UTC datetime.datetime() to a D-Bus type."""

1044

1018

if dt is None:

1045

1019

return dbus.String("", variant_level = variant_level)

1047

1021

variant_level=variant_level)

1048

1022

1049

1023

1050

def alternate_dbus_interfaces(alt_interface_names, deprecate=True):

1051

"""A class decorator; applied to a subclass of

1052

dbus.service.Object, it will add alternate D-Bus attributes with

1053

interface names according to the "alt_interface_names" mapping.

1054

Usage:

1055

1056

@alternate_dbus_interfaces({"org.example.Interface":

1057

"net.example.AlternateInterface"})

1058

class SampleDBusObject(dbus.service.Object):

1059

@dbus.service.method("org.example.Interface")

1060

def SampleDBusMethod():

1061

pass

1062

1063

The above "SampleDBusMethod" on "SampleDBusObject" will be

1064

reachable via two interfaces: "org.example.Interface" and

1065

"net.example.AlternateInterface", the latter of which will have

1066

its D-Bus annotation "org.freedesktop.DBus.Deprecated" set to

1067

"true", unless "deprecate" is passed with a False value.

1068

1069

This works for methods and signals, and also for D-Bus properties

1070

(from DBusObjectWithProperties) and interfaces (from the

1071

dbus_interface_annotations decorator).

1024

class AlternateDBusNamesMetaclass(DBusObjectWithProperties

1025

.__metaclass__):

1026

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

1027

will add additional D-Bus attributes matching a certain pattern.

1072

1028

"""

1073

def wrapper(cls):

1074

for orig_interface_name, alt_interface_name in (

1075

alt_interface_names.iteritems()):

1076

attr = {}

1077

interface_names = set()

1078

# Go though all attributes of the class

1079

for attrname, attribute in inspect.getmembers(cls):

1029

def __new__(mcs, name, bases, attr):

1030

# Go through all the base classes which could have D-Bus

1031

# methods, signals, or properties in them

1032

old_interface_names = []

1033

for base in (b for b in bases

1034

if issubclass(b, dbus.service.Object)):

1035

# Go though all attributes of the base class

1036

for attrname, attribute in inspect.getmembers(base):

1080

1037

# Ignore non-D-Bus attributes, and D-Bus attributes

1081

1038

# with the wrong interface name

1082

1039

if (not hasattr(attribute, "_dbus_interface")

1083

1040

or not attribute._dbus_interface

1084

.startswith(orig_interface_name)):

1041

.startswith("se.recompile.Mandos")):

1085

1042

continue

1086

1043

# Create an alternate D-Bus interface name based on

1087

1044

# the current name

1088

1045

alt_interface = (attribute._dbus_interface

1089

.replace(orig_interface_name,

1090

alt_interface_name))

1091

interface_names.add(alt_interface)

1046

.replace("se.recompile.Mandos",

1047

"se.bsnet.fukt.Mandos"))

1048

if alt_interface != attribute._dbus_interface:

1049

old_interface_names.append(alt_interface)

1092

1050

# Is this a D-Bus signal?

1093

1051

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

1094

# Extract the original non-method undecorated

1095

# function by black magic

1052

# Extract the original non-method function by

1053

# black magic

1096

1054

nonmethod_func = (dict(

1097

1055

zip(attribute.func_code.co_freevars,

1098

1056

attribute.__closure__))["func"]

1116

1074

except AttributeError:

1117

1075

pass

1118

1076

# Define a creator of a function to call both the

1119

# original and alternate functions, so both the

1120

# original and alternate signals gets sent when

1121

# the function is called

1077

# old and new functions, so both the old and new

1078

# signals gets sent when the function is called

1122

1079

def fixscope(func1, func2):

1123

1080

"""This function is a scope container to pass

1124

1081

func1 and func2 to the "call_both" function

1131

1088

return call_both

1132

1089

# Create the "call_both" function and add it to

1133

1090

# the class

1134

attr[attrname] = fixscope(attribute, new_function)

1091

attr[attrname] = fixscope(attribute,

1092

new_function)

1135

1093

# Is this a D-Bus method?

1136

1094

elif getattr(attribute, "_dbus_is_method", False):

1137

1095

# Create a new, but exactly alike, function

1193

1151

attribute.func_name,

1194

1152

attribute.func_defaults,

1195

1153

attribute.func_closure)))

1196

if deprecate:

1197

# Deprecate all alternate interfaces

1198

iname="_AlternateDBusNames_interface_annotation{0}"

1199

for interface_name in interface_names:

1200

@dbus_interface_annotations(interface_name)

1201

def func(self):

1202

return { "org.freedesktop.DBus.Deprecated":

1203

"true" }

1204

# Find an unused name

1205

for aname in (iname.format(i)

1206

for i in itertools.count()):

1207

if aname not in attr:

1208

attr[aname] = func

1209

break

1210

if interface_names:

1211

# Replace the class with a new subclass of it with

1212

# methods, signals, etc. as created above.

1213

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

1214

(cls,), attr)

1215

return cls

1216

return wrapper

1217

1218

1219

@alternate_dbus_interfaces({"se.recompile.Mandos":

1220

"se.bsnet.fukt.Mandos"})

1154

# Deprecate all old interfaces

1155

iname="_AlternateDBusNamesMetaclass_interface_annotation{0}"

1156

for old_interface_name in old_interface_names:

1157

@dbus_interface_annotations(old_interface_name)

1158

def func(self):

1159

return { "org.freedesktop.DBus.Deprecated": "true" }

1160

# Find an unused name

1161

for aname in (iname.format(i) for i in itertools.count()):

1162

if aname not in attr:

1163

attr[aname] = func

1164

break

1165

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

1166

1167

1221

1168

class ClientDBus(Client, DBusObjectWithProperties):

1222

1169

"""A Client class using D-Bus

1223

1170

1359

1306

return False

1360

1307

1361

1308

def approve(self, value=True):

1309

self.send_changedstate()

1362

1310

self.approved = value

1363

1311

gobject.timeout_add(timedelta_to_milliseconds

1364

1312

(self.approval_duration),

1365

1313

self._reset_approved)

1366

self.send_changedstate()

1367

1314

1368

1315

## D-Bus methods, signals & properties

1369

1316

_interface = "se.recompile.Mandos.Client"

1553

1500

def Timeout_dbus_property(self, value=None):

1554

1501

if value is None: # get

1555

1502

return dbus.UInt64(self.timeout_milliseconds())

1556

old_timeout = self.timeout

1557

1503

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

1558

# Reschedule disabling

1504

# Reschedule timeout

1559

1505

if self.enabled:

1560

1506

now = datetime.datetime.utcnow()

1561

self.expires += self.timeout - old_timeout

1562

if self.expires <= now:

1507

time_to_die = timedelta_to_milliseconds(

1508

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

1509

if time_to_die <= 0:

1563

1510

# The timeout has passed

1564

1511

self.disable()

1565

1512

else:

1513

self.expires = (now +

1514

datetime.timedelta(milliseconds =

1515

time_to_die))

1566

1516

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

1567

1517

is None):

1568

1518

return

1569

1519

gobject.source_remove(self.disable_initiator_tag)

1570

self.disable_initiator_tag = (

1571

gobject.timeout_add(

1572

timedelta_to_milliseconds(self.expires - now),

1573

self.disable))

1520

self.disable_initiator_tag = (gobject.timeout_add

1521

(time_to_die,

1522

self.disable))

1574

1523

1575

1524

# ExtendedTimeout - property

1576

1525

@dbus_service_property(_interface, signature="t",

1655

1604

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

1656

1605

1657

1606

1607

class ClientDBusTransitional(ClientDBus):

1608

__metaclass__ = AlternateDBusNamesMetaclass

1609

1610

1658

1611

class ClientHandler(socketserver.BaseRequestHandler, object):

1659

1612

"""A class to handle client connections.

1660

1613

1764

1717

#wait until timeout or approved

1765

1718

time = datetime.datetime.now()

1766

1719

client.changedstate.acquire()

1767

client.changedstate.wait(

1768

float(timedelta_to_milliseconds(delay)

1769

/ 1000))

1720

(client.changedstate.wait

1721

(float(client.timedelta_to_milliseconds(delay)

1722

/ 1000)))

1770

1723

client.changedstate.release()

1771

1724

time2 = datetime.datetime.now()

1772

1725

if (time2 - time) >= delay:

1888

1841

def process_request(self, request, address):

1889

1842

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

1890

1843

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

1891

args = (request, address))

1844

args = (request,

1845

address))

1892

1846

proc.start()

1893

1847

return proc

1894

1848

1922

1876

use_ipv6: Boolean; to use IPv6 or not

1923

1877

"""

1924

1878

def __init__(self, server_address, RequestHandlerClass,

1925

interface=None, use_ipv6=True, socketfd=None):

1926

"""If socketfd is set, use that file descriptor instead of

1927

creating a new one with socket.socket().

1928

"""

1879

interface=None, use_ipv6=True):

1929

1880

self.interface = interface

1930

1881

if use_ipv6:

1931

1882

self.address_family = socket.AF_INET6

1932

if socketfd is not None:

1933

# Save the file descriptor

1934

self.socketfd = socketfd

1935

# Save the original socket.socket() function

1936

self.socket_socket = socket.socket

1937

# To implement --socket, we monkey patch socket.socket.

1938

#

1939

# (When socketserver.TCPServer is a new-style class, we

1940

# could make self.socket into a property instead of monkey

1941

# patching socket.socket.)

1942

#

1943

# Create a one-time-only replacement for socket.socket()

1944

@functools.wraps(socket.socket)

1945

def socket_wrapper(*args, **kwargs):

1946

# Restore original function so subsequent calls are

1947

# not affected.

1948

socket.socket = self.socket_socket

1949

del self.socket_socket

1950

# This time only, return a new socket object from the

1951

# saved file descriptor.

1952

return socket.fromfd(self.socketfd, *args, **kwargs)

1953

# Replace socket.socket() function with wrapper

1954

socket.socket = socket_wrapper

1955

# The socketserver.TCPServer.__init__ will call

1956

# socket.socket(), which might be our replacement,

1957

# socket_wrapper(), if socketfd was set.

1958

1883

socketserver.TCPServer.__init__(self, server_address,

1959

1884

RequestHandlerClass)

1960

1961

1885

def server_bind(self):

1962

1886

"""This overrides the normal server_bind() function

1963

1887

to bind to an interface if one was specified, and also NOT to

1971

1895

try:

1972

1896

self.socket.setsockopt(socket.SOL_SOCKET,

1973

1897

SO_BINDTODEVICE,

1974

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

1898

str(self.interface

1899

+ '\0'))

1975

1900

except socket.error as error:

1976

if error.errno == errno.EPERM:

1977

logger.error("No permission to bind to"

1978

" interface %s", self.interface)

1979

elif error.errno == errno.ENOPROTOOPT:

1901

if error[0] == errno.EPERM:

1902

logger.error("No permission to"

1903

" bind to interface %s",

1904

self.interface)

1905

elif error[0] == errno.ENOPROTOOPT:

1980

1906

logger.error("SO_BINDTODEVICE not available;"

1981

1907

" cannot bind to interface %s",

1982

1908

self.interface)

1983

elif error.errno == errno.ENODEV:

1984

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

1985

" cannot bind", self.interface)

1986

1909

else:

1987

1910

raise

1988

1911

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

1991

1914

if self.address_family == socket.AF_INET6:

1992

1915

any_address = "::" # in6addr_any

1993

1916

else:

1994

any_address = "0.0.0.0" # INADDR_ANY

1917

any_address = socket.INADDR_ANY

1995

1918

self.server_address = (any_address,

1996

1919

self.server_address[1])

1997

1920

elif not self.server_address[1]:

2018

1941

"""

2019

1942

def __init__(self, server_address, RequestHandlerClass,

2020

1943

interface=None, use_ipv6=True, clients=None,

2021

gnutls_priority=None, use_dbus=True, socketfd=None):

1944

gnutls_priority=None, use_dbus=True):

2022

1945

self.enabled = False

2023

1946

self.clients = clients

2024

1947

if self.clients is None:

2028

1951

IPv6_TCPServer.__init__(self, server_address,

2029

1952

RequestHandlerClass,

2030

1953

interface = interface,

2031

use_ipv6 = use_ipv6,

2032

socketfd = socketfd)

1954

use_ipv6 = use_ipv6)

2033

1955

def server_activate(self):

2034

1956

if self.enabled:

2035

1957

return socketserver.TCPServer.server_activate(self)

2048

1970

2049

1971

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

2050

1972

proc = None, client_object=None):

1973

condition_names = {

1974

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

1975

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

1976

# blocking).

1977

gobject.IO_PRI: "PRI", # There is urgent data to read.

1978

gobject.IO_ERR: "ERR", # Error condition.

1979

gobject.IO_HUP: "HUP" # Hung up (the connection has been

1980

# broken, usually for pipes and

1981

# sockets).

1982

}

1983

conditions_string = ' | '.join(name

1984

for cond, name in

1985

condition_names.iteritems()

1986

if cond & condition)

2051

1987

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

2052

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

1988

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

2053

1989

# Wait for other process to exit

2054

1990

proc.join()

2055

1991

return False

2113

2049

return True

2114

2050

2115

2051

2116

def rfc3339_duration_to_delta(duration):

2117

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

2118

2119

>>> rfc3339_duration_to_delta("P7D")

2120

datetime.timedelta(7)

2121

>>> rfc3339_duration_to_delta("PT60S")

2122

datetime.timedelta(0, 60)

2123

>>> rfc3339_duration_to_delta("PT60M")

2124

datetime.timedelta(0, 3600)

2125

>>> rfc3339_duration_to_delta("PT24H")

2126

datetime.timedelta(1)

2127

>>> rfc3339_duration_to_delta("P1W")

2128

datetime.timedelta(7)

2129

>>> rfc3339_duration_to_delta("PT5M30S")

2130

datetime.timedelta(0, 330)

2131

>>> rfc3339_duration_to_delta("P1DT3M20S")

2132

datetime.timedelta(1, 200)

2133

"""

2134

2135

# Parsing an RFC 3339 duration with regular expressions is not

2136

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

2137

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

2138

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

2139

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

2140

# avoid excessive use of external libraries.

2141

2142

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

2143

Token = collections.namedtuple("Token",

2144

("regexp", # To match token; if

2145

# "value" is not None,

2146

# must have a "group"

2147

# containing digits

2148

"value", # datetime.timedelta or

2149

# None

2150

"followers")) # Tokens valid after

2151

# this token

2152

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

2153

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

2154

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

2155

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

2156

datetime.timedelta(seconds=1),

2157

frozenset((token_end,)))

2158

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

2159

datetime.timedelta(minutes=1),

2160

frozenset((token_second, token_end)))

2161

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

2162

datetime.timedelta(hours=1),

2163

frozenset((token_minute, token_end)))

2164

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

2165

None,

2166

frozenset((token_hour, token_minute,

2167

token_second)))

2168

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

2169

datetime.timedelta(days=1),

2170

frozenset((token_time, token_end)))

2171

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

2172

datetime.timedelta(weeks=4),

2173

frozenset((token_day, token_end)))

2174

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

2175

datetime.timedelta(weeks=52),

2176

frozenset((token_month, token_end)))

2177

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

2178

datetime.timedelta(weeks=1),

2179

frozenset((token_end,)))

2180

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

2181

frozenset((token_year, token_month,

2182

token_day, token_time,

2183

token_week))),

2184

# Define starting values

2185

value = datetime.timedelta() # Value so far

2186

found_token = None

2187

followers = frozenset(token_duration,) # Following valid tokens

2188

s = duration # String left to parse

2189

# Loop until end token is found

2190

while found_token is not token_end:

2191

# Search for any currently valid tokens

2192

for token in followers:

2193

match = token.regexp.match(s)

2194

if match is not None:

2195

# Token found

2196

if token.value is not None:

2197

# Value found, parse digits

2198

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

2199

# Add to value so far

2200

value += factor * token.value

2201

# Strip token from string

2202

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

2203

# Go to found token

2204

found_token = token

2205

# Set valid next tokens

2206

followers = found_token.followers

2207

break

2208

else:

2209

# No currently valid tokens were found

2210

raise ValueError("Invalid RFC 3339 duration")

2211

# End token found

2212

return value

2213

2214

2215

2052

def string_to_delta(interval):

2216

2053

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

2217

2054

2228

2065

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

2229

2066

datetime.timedelta(0, 330)

2230

2067

"""

2231

2232

try:

2233

return rfc3339_duration_to_delta(interval)

2234

except ValueError:

2235

pass

2236

2237

2068

timevalue = datetime.timedelta(0)

2238

2069

for s in interval.split():

2239

2070

try:

2302

2133

help="Run self-test")

2303

2134

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

2304

2135

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

2305

" to terminal", default=None)

2136

" to terminal")

2306

2137

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

2307

2138

help="Debug level for stdout output")

2308

2139

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

2315

2146

" files")

2316

2147

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

2317

2148

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

2318

" system bus interface", default=None)

2149

" system bus interface")

2319

2150

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

2320

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

2321

default=None)

2151

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

2322

2152

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

2323

2153

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

2324

" state", default=None)

2325

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

2326

help="Specify a file descriptor to a network"

2327

" socket to use instead of creating one")

2154

" state")

2328

2155

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

2329

2156

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

2330

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

2331

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

2332

2157

2333

2158

options = parser.parse_args()

2334

2159

2343

2168

"port": "",

2344

2169

"debug": "False",

2345

2170

"priority":

2346

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

2171

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

2347

2172

"servicename": "Mandos",

2348

2173

"use_dbus": "True",

2349

2174

"use_ipv6": "True",

2350

2175

"debuglevel": "",

2351

2176

"restore": "True",

2352

"socket": "",

2353

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

2354

"foreground": "False",

2177

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

2355

2178

}

2356

2179

2357

2180

# Parse config file for server-global settings

2362

2185

# Convert the SafeConfigParser object to a dict

2363

2186

server_settings = server_config.defaults()

2364

2187

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

2365

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

2188

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

2366

2189

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

2367

2190

option)

2368

2191

if server_settings["port"]:

2369

2192

server_settings["port"] = server_config.getint("DEFAULT",

2370

2193

"port")

2371

if server_settings["socket"]:

2372

server_settings["socket"] = server_config.getint("DEFAULT",

2373

"socket")

2374

# Later, stdin will, and stdout and stderr might, be dup'ed

2375

# over with an opened os.devnull. But we don't want this to

2376

# happen with a supplied network socket.

2377

if 0 <= server_settings["socket"] <= 2:

2378

server_settings["socket"] = os.dup(server_settings

2379

["socket"])

2380

2194

del server_config

2381

2195

2382

2196

# Override the settings from the config file with command line

2384

2198

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

2385

2199

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

2386

2200

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

2387

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

2201

"statedir"):

2388

2202

value = getattr(options, option)

2389

2203

if value is not None:

2390

2204

server_settings[option] = value

2393

2207

for option in server_settings.keys():

2394

2208

if type(server_settings[option]) is str:

2395

2209

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

2396

# Force all boolean options to be boolean

2397

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

2398

"foreground"):

2399

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

2400

# Debug implies foreground

2401

if server_settings["debug"]:

2402

server_settings["foreground"] = True

2403

2210

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

2404

2211

2405

2212

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

2411

2218

use_ipv6 = server_settings["use_ipv6"]

2412

2219

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

2413

2220

stored_state_file)

2414

foreground = server_settings["foreground"]

2415

2221

2416

2222

if debug:

2417

2223

initlogger(debug, logging.DEBUG)

2446

2252

use_ipv6=use_ipv6,

2447

2253

gnutls_priority=

2448

2254

server_settings["priority"],

2449

use_dbus=use_dbus,

2450

socketfd=(server_settings["socket"]

2451

or None))

2452

if not foreground:

2255

use_dbus=use_dbus)

2256

if not debug:

2453

2257

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

2454

pidfile = None

2455

2258

try:

2456

2259

pidfile = open(pidfilename, "w")

2457

2260

except IOError as e:

2472

2275

os.setgid(gid)

2473

2276

os.setuid(uid)

2474

2277

except OSError as error:

2475

if error.errno != errno.EPERM:

2278

if error[0] != errno.EPERM:

2476

2279

raise error

2477

2280

2478

2281

if debug:

2496

2299

os.close(null)

2497

2300

2498

2301

# Need to fork before connecting to D-Bus

2499

if not foreground:

2302

if not debug:

2500

2303

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

2501

2304

daemon()

2502

2305

2503

# multiprocessing will use threads, so before we use gobject we

2504

# need to inform gobject that threads will be used.

2505

2306

gobject.threads_init()

2506

2307

2507

2308

global main_loop

2536

2337

2537

2338

client_class = Client

2538

2339

if use_dbus:

2539

client_class = functools.partial(ClientDBus, bus = bus)

2340

client_class = functools.partial(ClientDBusTransitional,

2341

bus = bus)

2540

2342

2541

2343

client_settings = Client.config_parser(client_config)

2542

2344

old_client_settings = {}

2543

2345

clients_data = {}

2544

2346

2545

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

2546

global wnull

2547

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

2548

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

2549

# mode

2550

if debug or not foreground:

2551

wnull.close()

2552

2553

2347

# Get client data and settings from last running state.

2554

2348

if server_settings["restore"]:

2555

2349

try:

2571

2365

2572

2366

with PGPEngine() as pgp:

2573

2367

for client_name, client in clients_data.iteritems():

2574

# Skip removed clients

2575

if client_name not in client_settings:

2576

continue

2577

2578

2368

# Decide which value to use after restoring saved state.

2579

2369

# We have three different values: Old config file,

2580

2370

# new config file, and saved state.

2642

2432

# Create all client objects

2643

2433

for client_name, client in clients_data.iteritems():

2644

2434

tcp_server.clients[client_name] = client_class(

2645

name = client_name, settings = client,

2646

server_settings = server_settings)

2435

name = client_name, settings = client)

2647

2436

2648

2437

if not tcp_server.clients:

2649

2438

logger.warning("No clients defined")

2650

2439

2651

if not foreground:

2652

if pidfile is not None:

2653

try:

2654

with pidfile:

2655

pid = os.getpid()

2656

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

2657

except IOError:

2658

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

2659

pidfilename, pid)

2660

del pidfile

2440

if not debug:

2441

try:

2442

with pidfile:

2443

pid = os.getpid()

2444

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

2445

del pidfile

2446

except IOError:

2447

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

2448

pidfilename, pid)

2449

except NameError:

2450

# "pidfile" was never created

2451

pass

2661

2452

del pidfilename

2453

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

2662

2454

2663

2455

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

2664

2456

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

2665

2457

2666

2458

if use_dbus:

2667

@alternate_dbus_interfaces({"se.recompile.Mandos":

2668

"se.bsnet.fukt.Mandos"})

2669

2459

class MandosDBusService(DBusObjectWithProperties):

2670

2460

"""A D-Bus proxy object"""

2671

2461

def __init__(self):

2725

2515

2726

2516

del _interface

2727

2517

2728

mandos_dbus_service = MandosDBusService()

2518

class MandosDBusServiceTransitional(MandosDBusService):

2519

__metaclass__ = AlternateDBusNamesMetaclass

2520

mandos_dbus_service = MandosDBusServiceTransitional()

2729

2521

2730

2522

def cleanup():

2731

2523

"Cleanup function; run on exit"

2732

2524

service.cleanup()

2733

2525

2734

2526

multiprocessing.active_children()

2735

wnull.close()

2736

2527

if not (tcp_server.clients or client_settings):

2737

2528

return

2738

2529

2750

2541

# A list of attributes that can not be pickled

2751

2542

# + secret.

2752

2543

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

2753

"checker", "server_settings"))

2544

"checker"))

2754

2545

for name, typ in (inspect.getmembers

2755

2546

(dbus.service.Object)):

2756

2547

exclude.add(name)

2765

2556

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

2766

2557

2767

2558

try:

2768

with (tempfile.NamedTemporaryFile

2769

(mode='wb', suffix=".pickle", prefix='clients-',

2770

dir=os.path.dirname(stored_state_path),

2771

delete=False)) as stored_state:

2559

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

2560

prefix="clients-",

2561

dir=os.path.dirname

2562

(stored_state_path))

2563

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

2772

2564

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

2773

tempname=stored_state.name

2774

2565

os.rename(tempname, stored_state_path)

2775

2566

except (IOError, OSError) as e:

2776

2567

if not debug: