/mandos/trunk : revision 237.4.43

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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 = "1.6.5"

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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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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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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 = str("/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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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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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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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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setattr(self, setting, value)

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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)

682

except (AttributeError, OSError) as error:

683

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

697

except OSError as error:

698

if error.errno != errno.ECHILD:

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raise

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700

else:

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701

if pid:

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logger.warning("Checker was a zombie")

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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"]

732

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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shell=True, cwd="/",

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**popen_args)

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739

except OSError as error:

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logger.error("Failed to start subprocess",

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exc_info=error)

742

return True

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743

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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748

# watch was added. Check for this.

725

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

749

try:

750

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

751

except OSError as error:

752

if error.errno == errno.ECHILD:

753

# This should never happen

754

logger.error("Child process vanished",

755

exc_info=error)

756

return True

757

raise

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758

if pid:

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759

gobject.source_remove(self.checker_callback_tag)

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self.checker_callback(pid, status, command)

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# The byte_arrays option is not supported yet on

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937

# signatures other than "ay".

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if prop._dbus_signature != "ay":

907

raise ValueError

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

940

"'ay' signature {0!r}"

941

.format(prop._dbus_signature))

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942

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

909

943

for byte in value))

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prop(value)

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interface_names.add(alt_interface)

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1103

# 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 function by

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# black magic

1105

# Extract the original non-method undecorated

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# function by black magic

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1107

nonmethod_func = (dict(

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zip(attribute.func_code.co_freevars,

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attribute.__closure__))["func"]

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*args, **kwargs)

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1320

1354

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

1355

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

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1356

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

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# Only if new checker process was started

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1358

if (self.checker is not None

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1703

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

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1704

try:

1675

1705

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

1676

raise RuntimeError

1706

raise RuntimeError(line)

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1707

except (ValueError, IndexError, RuntimeError) as error:

1678

1708

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

1679

1709

return

1886

1916

1887

1917

def add_pipe(self, parent_pipe, proc):

1888

1918

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

1889

raise NotImplementedError

1919

raise NotImplementedError()

1890

1920

1891

1921

1892

1922

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1948

1978

try:

1949

1979

self.socket.setsockopt(socket.SOL_SOCKET,

1950

1980

SO_BINDTODEVICE,

1951

str(self.interface

1952

+ '\0'))

1981

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

1953

1982

except socket.error as error:

1954

1983

if error.errno == errno.EPERM:

1955

logger.error("No permission to"

1956

" bind to interface %s",

1957

self.interface)

1984

logger.error("No permission to bind to"

1985

" interface %s", self.interface)

1958

1986

elif error.errno == errno.ENOPROTOOPT:

1959

1987

logger.error("SO_BINDTODEVICE not available;"

1960

1988

" cannot bind to interface %s",

1961

1989

self.interface)

1962

1990

elif error.errno == errno.ENODEV:

1963

logger.error("Interface %s does not"

1964

" exist, cannot bind",

1965

self.interface)

1991

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

1992

" cannot bind", self.interface)

1966

1993

else:

1967

1994

raise

1968

1995

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

1971

1998

if self.address_family == socket.AF_INET6:

1972

1999

any_address = "::" # in6addr_any

1973

2000

else:

1974

any_address = socket.INADDR_ANY

2001

any_address = "0.0.0.0" # INADDR_ANY

1975

2002

self.server_address = (any_address,

1976

2003

self.server_address[1])

1977

2004

elif not self.server_address[1]:

2093

2120

return True

2094

2121

2095

2122

2123

def rfc3339_duration_to_delta(duration):

2124

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

2125

2126

>>> rfc3339_duration_to_delta("P7D")

2127

datetime.timedelta(7)

2128

>>> rfc3339_duration_to_delta("PT60S")

2129

datetime.timedelta(0, 60)

2130

>>> rfc3339_duration_to_delta("PT60M")

2131

datetime.timedelta(0, 3600)

2132

>>> rfc3339_duration_to_delta("PT24H")

2133

datetime.timedelta(1)

2134

>>> rfc3339_duration_to_delta("P1W")

2135

datetime.timedelta(7)

2136

>>> rfc3339_duration_to_delta("PT5M30S")

2137

datetime.timedelta(0, 330)

2138

>>> rfc3339_duration_to_delta("P1DT3M20S")

2139

datetime.timedelta(1, 200)

2140

"""

2141

2142

# Parsing an RFC 3339 duration with regular expressions is not

2143

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

2144

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

2145

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

2146

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

2147

# avoid excessive use of external libraries.

2148

2149

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

2150

Token = collections.namedtuple("Token",

2151

("regexp", # To match token; if

2152

# "value" is not None,

2153

# must have a "group"

2154

# containing digits

2155

"value", # datetime.timedelta or

2156

# None

2157

"followers")) # Tokens valid after

2158

# this token

2159

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

2160

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

2161

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

2162

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

2163

datetime.timedelta(seconds=1),

2164

frozenset((token_end,)))

2165

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

2166

datetime.timedelta(minutes=1),

2167

frozenset((token_second, token_end)))

2168

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

2169

datetime.timedelta(hours=1),

2170

frozenset((token_minute, token_end)))

2171

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

2172

None,

2173

frozenset((token_hour, token_minute,

2174

token_second)))

2175

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

2176

datetime.timedelta(days=1),

2177

frozenset((token_time, token_end)))

2178

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

2179

datetime.timedelta(weeks=4),

2180

frozenset((token_day, token_end)))

2181

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

2182

datetime.timedelta(weeks=52),

2183

frozenset((token_month, token_end)))

2184

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

2185

datetime.timedelta(weeks=1),

2186

frozenset((token_end,)))

2187

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

2188

frozenset((token_year, token_month,

2189

token_day, token_time,

2190

token_week))),

2191

# Define starting values

2192

value = datetime.timedelta() # Value so far

2193

found_token = None

2194

followers = frozenset(token_duration,) # Following valid tokens

2195

s = duration # String left to parse

2196

# Loop until end token is found

2197

while found_token is not token_end:

2198

# Search for any currently valid tokens

2199

for token in followers:

2200

match = token.regexp.match(s)

2201

if match is not None:

2202

# Token found

2203

if token.value is not None:

2204

# Value found, parse digits

2205

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

2206

# Add to value so far

2207

value += factor * token.value

2208

# Strip token from string

2209

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

2210

# Go to found token

2211

found_token = token

2212

# Set valid next tokens

2213

followers = found_token.followers

2214

break

2215

else:

2216

# No currently valid tokens were found

2217

raise ValueError("Invalid RFC 3339 duration")

2218

# End token found

2219

return value

2220

2221

2096

2222

def string_to_delta(interval):

2097

2223

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

2098

2224

2109

2235

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

2110

2236

datetime.timedelta(0, 330)

2111

2237

"""

2238

2239

try:

2240

return rfc3339_duration_to_delta(interval)

2241

except ValueError:

2242

pass

2243

2112

2244

timevalue = datetime.timedelta(0)

2113

2245

for s in interval.split():

2114

2246

try:

2127

2259

else:

2128

2260

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

2129

2261

.format(suffix))

2130

except (ValueError, IndexError) as e:

2262

except IndexError as e:

2131

2263

raise ValueError(*(e.args))

2132

2264

timevalue += delta

2133

2265

return timevalue

2177

2309

help="Run self-test")

2178

2310

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

2179

2311

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

2180

" to terminal")

2312

" to terminal", default=None)

2181

2313

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

2182

2314

help="Debug level for stdout output")

2183

2315

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

2190

2322

" files")

2191

2323

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

2192

2324

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

2193

" system bus interface")

2325

" system bus interface", default=None)

2194

2326

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

2195

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

2327

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

2328

default=None)

2196

2329

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

2197

2330

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

2198

" state")

2331

" state", default=None)

2199

2332

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

2200

2333

help="Specify a file descriptor to a network"

2201

2334

" socket to use instead of creating one")

2202

2335

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

2203

2336

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

2337

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

2338

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

2204

2339

2205

2340

options = parser.parse_args()

2206

2341

2207

2342

if options.check:

2208

2343

import doctest

2209

doctest.testmod()

2210

sys.exit()

2344

fail_count, test_count = doctest.testmod()

2345

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

2211

2346

2212

2347

# Default values for config file for server-global settings

2213

2348

server_defaults = { "interface": "",

2215

2350

"port": "",

2216

2351

"debug": "False",

2217

2352

"priority":

2218

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

2353

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

2219

2354

"servicename": "Mandos",

2220

2355

"use_dbus": "True",

2221

2356

"use_ipv6": "True",

2222

2357

"debuglevel": "",

2223

2358

"restore": "True",

2224

2359

"socket": "",

2225

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

2360

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

2361

"foreground": "False",

2226

2362

}

2227

2363

2228

2364

# Parse config file for server-global settings

2233

2369

# Convert the SafeConfigParser object to a dict

2234

2370

server_settings = server_config.defaults()

2235

2371

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

2236

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

2372

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

2237

2373

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

2238

2374

option)

2239

2375

if server_settings["port"]:

2255

2391

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

2256

2392

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

2257

2393

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

2258

"statedir", "socket"):

2394

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

2259

2395

value = getattr(options, option)

2260

2396

if value is not None:

2261

2397

server_settings[option] = value

2264

2400

for option in server_settings.keys():

2265

2401

if type(server_settings[option]) is str:

2266

2402

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

2403

# Force all boolean options to be boolean

2404

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

2405

"foreground"):

2406

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

2407

# Debug implies foreground

2408

if server_settings["debug"]:

2409

server_settings["foreground"] = True

2267

2410

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

2268

2411

2269

2412

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

2275

2418

use_ipv6 = server_settings["use_ipv6"]

2276

2419

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

2277

2420

stored_state_file)

2421

foreground = server_settings["foreground"]

2278

2422

2279

2423

if debug:

2280

2424

initlogger(debug, logging.DEBUG)

2312

2456

use_dbus=use_dbus,

2313

2457

socketfd=(server_settings["socket"]

2314

2458

or None))

2315

if not debug:

2316

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

2459

if not foreground:

2460

pidfilename = "/run/mandos.pid"

2461

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

2462

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

2463

pidfile = None

2317

2464

try:

2318

2465

pidfile = open(pidfilename, "w")

2319

2466

except IOError as e:

2335

2482

os.setuid(uid)

2336

2483

except OSError as error:

2337

2484

if error.errno != errno.EPERM:

2338

raise error

2485

raise

2339

2486

2340

2487

if debug:

2341

2488

# Enable all possible GnuTLS debugging

2358

2505

os.close(null)

2359

2506

2360

2507

# Need to fork before connecting to D-Bus

2361

if not debug:

2508

if not foreground:

2362

2509

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

2363

2510

daemon()

2364

2511

2404

2551

old_client_settings = {}

2405

2552

clients_data = {}

2406

2553

2554

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

2555

global wnull

2556

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

2557

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

2558

# mode

2559

if debug or not foreground:

2560

wnull.close()

2561

2407

2562

# Get client data and settings from last running state.

2408

2563

if server_settings["restore"]:

2409

2564

try:

2425

2580

2426

2581

with PGPEngine() as pgp:

2427

2582

for client_name, client in clients_data.iteritems():

2583

# Skip removed clients

2584

if client_name not in client_settings:

2585

continue

2586

2428

2587

# Decide which value to use after restoring saved state.

2429

2588

# We have three different values: Old config file,

2430

2589

# new config file, and saved state.

2492

2651

# Create all client objects

2493

2652

for client_name, client in clients_data.iteritems():

2494

2653

tcp_server.clients[client_name] = client_class(

2495

name = client_name, settings = client)

2654

name = client_name, settings = client,

2655

server_settings = server_settings)

2496

2656

2497

2657

if not tcp_server.clients:

2498

2658

logger.warning("No clients defined")

2499

2659

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

2660

if not foreground:

2661

if pidfile is not None:

2662

try:

2663

with pidfile:

2664

pid = os.getpid()

2665

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

2666

except IOError:

2667

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

2668

pidfilename, pid)

2669

del pidfile

2512

2670

del pidfilename

2513

2671

2514

2672

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

2583

2741

service.cleanup()

2584

2742

2585

2743

multiprocessing.active_children()

2744

wnull.close()

2586

2745

if not (tcp_server.clients or client_settings):

2587

2746

return

2588

2747

2600

2759

# A list of attributes that can not be pickled

2601

2760

# + secret.

2602

2761

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

2603

"checker"))

2762

"checker", "server_settings"))

2604

2763

for name, typ in (inspect.getmembers

2605

2764

(dbus.service.Object)):

2606

2765

exclude.add(name)

2634

2793

else:

2635

2794

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

2636

2795

exc_info=e)

2637

raise e

2796

raise

2638

2797

2639

2798

# Delete all clients, and settings from config

2640

2799

while tcp_server.clients: