/mandos/trunk : revision 586

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.1"

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version = "1.5.4"

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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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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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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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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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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": "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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# 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.

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popen_args = {}

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if (not self.server_settings["debug"]

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and self.server_settings["foreground"]):

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popen_args.update({"stdout": wnull,

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"stderr": wnull })

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self.checker = subprocess.Popen(command,

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close_fds=True,

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shell=True, cwd="/",

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**popen_args)

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shell=True, cwd="/")

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except OSError as error:

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logger.error("Failed to start subprocess",

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exc_info=error)

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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.

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try:

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

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except OSError as error:

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if error.errno == errno.ECHILD:

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# This should never happen

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logger.error("Child process vanished",

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exc_info=error)

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return True

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raise

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

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if pid:

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gobject.source_remove(self.checker_callback_tag)

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self.checker_callback(pid, status, command)

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return xmlstring

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def datetime_to_dbus(dt, variant_level=0):

1019

def datetime_to_dbus (dt, variant_level=0):

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1020

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

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1021

if dt is None:

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

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interface names according to the "alt_interface_names" mapping.

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Usage:

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

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"net.example.AlternateInterface"})

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

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"net.example.AlternateInterface"})

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class SampleDBusObject(dbus.service.Object):

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

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def SampleDBusMethod():

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interface_names.add(alt_interface)

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# Is this a D-Bus signal?

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

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# Extract the original non-method undecorated

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# function by black magic

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# Extract the original non-method function by

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# black magic

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nonmethod_func = (dict(

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zip(attribute.func_code.co_freevars,

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attribute.__closure__))["func"]

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use_ipv6: Boolean; to use IPv6 or not

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"""

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def __init__(self, server_address, RequestHandlerClass,

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

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

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creating a new one with socket.socket().

1934

"""

1902

interface=None, use_ipv6=True):

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self.interface = interface

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if use_ipv6:

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1905

self.address_family = socket.AF_INET6

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if socketfd is not None:

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# Save the file descriptor

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self.socketfd = socketfd

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# Save the original socket.socket() function

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self.socket_socket = socket.socket

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

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#

1945

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

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

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# patching socket.socket.)

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#

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

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@functools.wraps(socket.socket)

1951

def socket_wrapper(*args, **kwargs):

1952

# Restore original function so subsequent calls are

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# not affected.

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socket.socket = self.socket_socket

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del self.socket_socket

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

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# saved file descriptor.

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

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# Replace socket.socket() function with wrapper

1960

socket.socket = socket_wrapper

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# The socketserver.TCPServer.__init__ will call

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

1963

# socket_wrapper(), if socketfd was set.

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1906

socketserver.TCPServer.__init__(self, server_address,

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1907

RequestHandlerClass)

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1967

1908

def server_bind(self):

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1909

"""This overrides the normal server_bind() function

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1910

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

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1918

try:

1978

1919

self.socket.setsockopt(socket.SOL_SOCKET,

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1920

SO_BINDTODEVICE,

1980

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

1921

str(self.interface

1922

+ '\0'))

1981

1923

except socket.error as error:

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1924

if error.errno == errno.EPERM:

1983

logger.error("No permission to bind to"

1984

" interface %s", self.interface)

1925

logger.error("No permission to"

1926

" bind to interface %s",

1927

self.interface)

1985

1928

elif error.errno == errno.ENOPROTOOPT:

1986

1929

logger.error("SO_BINDTODEVICE not available;"

1987

1930

" cannot bind to interface %s",

1988

1931

self.interface)

1989

1932

elif error.errno == errno.ENODEV:

1990

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

1991

" cannot bind", self.interface)

1933

logger.error("Interface %s does not"

1934

" exist, cannot bind",

1935

self.interface)

1992

1936

else:

1993

1937

raise

1994

1938

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

1997

1941

if self.address_family == socket.AF_INET6:

1998

1942

any_address = "::" # in6addr_any

1999

1943

else:

2000

any_address = "0.0.0.0" # INADDR_ANY

1944

any_address = socket.INADDR_ANY

2001

1945

self.server_address = (any_address,

2002

1946

self.server_address[1])

2003

1947

elif not self.server_address[1]:

2024

1968

"""

2025

1969

def __init__(self, server_address, RequestHandlerClass,

2026

1970

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

2027

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

1971

gnutls_priority=None, use_dbus=True):

2028

1972

self.enabled = False

2029

1973

self.clients = clients

2030

1974

if self.clients is None:

2034

1978

IPv6_TCPServer.__init__(self, server_address,

2035

1979

RequestHandlerClass,

2036

1980

interface = interface,

2037

use_ipv6 = use_ipv6,

2038

socketfd = socketfd)

1981

use_ipv6 = use_ipv6)

2039

1982

def server_activate(self):

2040

1983

if self.enabled:

2041

1984

return socketserver.TCPServer.server_activate(self)

2119

2062

return True

2120

2063

2121

2064

2122

def rfc3339_duration_to_delta(duration):

2123

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

2124

2125

>>> rfc3339_duration_to_delta("P7D")

2126

datetime.timedelta(7)

2127

>>> rfc3339_duration_to_delta("PT60S")

2128

datetime.timedelta(0, 60)

2129

>>> rfc3339_duration_to_delta("PT60M")

2130

datetime.timedelta(0, 3600)

2131

>>> rfc3339_duration_to_delta("PT24H")

2132

datetime.timedelta(1)

2133

>>> rfc3339_duration_to_delta("P1W")

2134

datetime.timedelta(7)

2135

>>> rfc3339_duration_to_delta("PT5M30S")

2136

datetime.timedelta(0, 330)

2137

>>> rfc3339_duration_to_delta("P1DT3M20S")

2138

datetime.timedelta(1, 200)

2139

"""

2140

2141

# Parsing an RFC 3339 duration with regular expressions is not

2142

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

2143

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

2144

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

2145

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

2146

# avoid excessive use of external libraries.

2147

2148

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

2149

Token = collections.namedtuple("Token",

2150

("regexp", # To match token; if

2151

# "value" is not None,

2152

# must have a "group"

2153

# containing digits

2154

"value", # datetime.timedelta or

2155

# None

2156

"followers")) # Tokens valid after

2157

# this token

2158

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

2159

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

2160

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

2161

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

2162

datetime.timedelta(seconds=1),

2163

frozenset((token_end,)))

2164

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

2165

datetime.timedelta(minutes=1),

2166

frozenset((token_second, token_end)))

2167

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

2168

datetime.timedelta(hours=1),

2169

frozenset((token_minute, token_end)))

2170

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

2171

None,

2172

frozenset((token_hour, token_minute,

2173

token_second)))

2174

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

2175

datetime.timedelta(days=1),

2176

frozenset((token_time, token_end)))

2177

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

2178

datetime.timedelta(weeks=4),

2179

frozenset((token_day, token_end)))

2180

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

2181

datetime.timedelta(weeks=52),

2182

frozenset((token_month, token_end)))

2183

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

2184

datetime.timedelta(weeks=1),

2185

frozenset((token_end,)))

2186

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

2187

frozenset((token_year, token_month,

2188

token_day, token_time,

2189

token_week))),

2190

# Define starting values

2191

value = datetime.timedelta() # Value so far

2192

found_token = None

2193

followers = frozenset(token_duration,) # Following valid tokens

2194

s = duration # String left to parse

2195

# Loop until end token is found

2196

while found_token is not token_end:

2197

# Search for any currently valid tokens

2198

for token in followers:

2199

match = token.regexp.match(s)

2200

if match is not None:

2201

# Token found

2202

if token.value is not None:

2203

# Value found, parse digits

2204

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

2205

# Add to value so far

2206

value += factor * token.value

2207

# Strip token from string

2208

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

2209

# Go to found token

2210

found_token = token

2211

# Set valid next tokens

2212

followers = found_token.followers

2213

break

2214

else:

2215

# No currently valid tokens were found

2216

raise ValueError("Invalid RFC 3339 duration")

2217

# End token found

2218

return value

2219

2220

2221

2065

def string_to_delta(interval):

2222

2066

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

2223

2067

2234

2078

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

2235

2079

datetime.timedelta(0, 330)

2236

2080

"""

2237

2238

try:

2239

return rfc3339_duration_to_delta(interval)

2240

except ValueError:

2241

pass

2242

2243

2081

timevalue = datetime.timedelta(0)

2244

2082

for s in interval.split():

2245

2083

try:

2308

2146

help="Run self-test")

2309

2147

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

2310

2148

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

2311

" to terminal", default=None)

2149

" to terminal")

2312

2150

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

2313

2151

help="Debug level for stdout output")

2314

2152

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

2321

2159

" files")

2322

2160

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

2323

2161

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

2324

" system bus interface", default=None)

2162

" system bus interface")

2325

2163

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

2326

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

2327

default=None)

2164

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

2328

2165

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

2329

2166

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

2330

" state", default=None)

2331

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

2332

help="Specify a file descriptor to a network"

2333

" socket to use instead of creating one")

2167

" state")

2334

2168

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

2335

2169

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

2336

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

2337

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

2338

2170

2339

2171

options = parser.parse_args()

2340

2172

2349

2181

"port": "",

2350

2182

"debug": "False",

2351

2183

"priority":

2352

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

2184

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

2353

2185

"servicename": "Mandos",

2354

2186

"use_dbus": "True",

2355

2187

"use_ipv6": "True",

2356

2188

"debuglevel": "",

2357

2189

"restore": "True",

2358

"socket": "",

2359

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

2360

"foreground": "False",

2190

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

2361

2191

}

2362

2192

2363

2193

# Parse config file for server-global settings

2368

2198

# Convert the SafeConfigParser object to a dict

2369

2199

server_settings = server_config.defaults()

2370

2200

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

2371

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

2201

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

2372

2202

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

2373

2203

option)

2374

2204

if server_settings["port"]:

2375

2205

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

2376

2206

"port")

2377

if server_settings["socket"]:

2378

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

2379

"socket")

2380

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

2381

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

2382

# happen with a supplied network socket.

2383

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

2384

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

2385

["socket"])

2386

2207

del server_config

2387

2208

2388

2209

# Override the settings from the config file with command line

2390

2211

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

2391

2212

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

2392

2213

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

2393

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

2214

"statedir"):

2394

2215

value = getattr(options, option)

2395

2216

if value is not None:

2396

2217

server_settings[option] = value

2399

2220

for option in server_settings.keys():

2400

2221

if type(server_settings[option]) is str:

2401

2222

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

2402

# Force all boolean options to be boolean

2403

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

2404

"foreground"):

2405

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

2406

# Debug implies foreground

2407

if server_settings["debug"]:

2408

server_settings["foreground"] = True

2409

2223

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

2410

2224

2411

2225

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

2417

2231

use_ipv6 = server_settings["use_ipv6"]

2418

2232

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

2419

2233

stored_state_file)

2420

foreground = server_settings["foreground"]

2421

2234

2422

2235

if debug:

2423

2236

initlogger(debug, logging.DEBUG)

2452

2265

use_ipv6=use_ipv6,

2453

2266

gnutls_priority=

2454

2267

server_settings["priority"],

2455

use_dbus=use_dbus,

2456

socketfd=(server_settings["socket"]

2457

or None))

2458

if not foreground:

2459

pidfilename = "/run/mandos.pid"

2460

pidfile = None

2268

use_dbus=use_dbus)

2269

if not debug:

2270

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

2461

2271

try:

2462

2272

pidfile = open(pidfilename, "w")

2463

2273

except IOError as e:

2502

2312

os.close(null)

2503

2313

2504

2314

# Need to fork before connecting to D-Bus

2505

if not foreground:

2315

if not debug:

2506

2316

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

2507

2317

daemon()

2508

2318

2509

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

2510

# need to inform gobject that threads will be used.

2511

2319

gobject.threads_init()

2512

2320

2513

2321

global main_loop

2548

2356

old_client_settings = {}

2549

2357

clients_data = {}

2550

2358

2551

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

2552

global wnull

2553

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

2554

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

2555

# mode

2556

if debug or not foreground:

2557

wnull.close()

2558

2559

2359

# Get client data and settings from last running state.

2560

2360

if server_settings["restore"]:

2561

2361

try:

2577

2377

2578

2378

with PGPEngine() as pgp:

2579

2379

for client_name, client in clients_data.iteritems():

2580

# Skip removed clients

2581

if client_name not in client_settings:

2582

continue

2583

2584

2380

# Decide which value to use after restoring saved state.

2585

2381

# We have three different values: Old config file,

2586

2382

# new config file, and saved state.

2648

2444

# Create all client objects

2649

2445

for client_name, client in clients_data.iteritems():

2650

2446

tcp_server.clients[client_name] = client_class(

2651

name = client_name, settings = client,

2652

server_settings = server_settings)

2447

name = client_name, settings = client)

2653

2448

2654

2449

if not tcp_server.clients:

2655

2450

logger.warning("No clients defined")

2656

2451

2657

if not foreground:

2658

if pidfile is not None:

2659

try:

2660

with pidfile:

2661

pid = os.getpid()

2662

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

2663

except IOError:

2664

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

2665

pidfilename, pid)

2666

del pidfile

2452

if not debug:

2453

try:

2454

with pidfile:

2455

pid = os.getpid()

2456

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

2457

del pidfile

2458

except IOError:

2459

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

2460

pidfilename, pid)

2461

except NameError:

2462

# "pidfile" was never created

2463

pass

2667

2464

del pidfilename

2668

2465

2669

2466

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

2738

2535

service.cleanup()

2739

2536

2740

2537

multiprocessing.active_children()

2741

wnull.close()

2742

2538

if not (tcp_server.clients or client_settings):

2743

2539

return

2744

2540

2756

2552

# A list of attributes that can not be pickled

2757

2553

# + secret.

2758

2554

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

2759

"checker", "server_settings"))

2555

"checker"))

2760

2556

for name, typ in (inspect.getmembers

2761

2557

(dbus.service.Object)):

2762

2558

exclude.add(name)