/mandos/release : revision 237.7.146

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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 = "1.6.3"

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version = "1.5.5"

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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 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

532

if server_settings is None:

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server_settings = {}

534

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)

693

except AttributeError:

694

pass

695

except OSError as error:

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if error.errno != errno.ECHILD:

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raise

682

except (AttributeError, OSError) as error:

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if (isinstance(error, OSError)

684

and error.errno != errno.ECHILD):

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raise error

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else:

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if pid:

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688

logger.warning("Checker was a zombie")

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

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711

# 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"]

730

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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717

logger.error("Failed to start subprocess",

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718

exc_info=error)

740

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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722

data=command))

745

723

# The checker may have completed before the gobject

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724

# watch was added. Check for this.

747

try:

748

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

749

except OSError as error:

750

if error.errno == errno.ECHILD:

751

# This should never happen

752

logger.error("Child process vanished",

753

exc_info=error)

754

return True

755

raise

725

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

756

726

if pid:

757

727

gobject.source_remove(self.checker_callback_tag)

758

728

self.checker_callback(pid, status, command)

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904

# The byte_arrays option is not supported yet on

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905

# signatures other than "ay".

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906

if prop._dbus_signature != "ay":

937

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

938

"'ay' signature {0!r}"

939

.format(prop._dbus_signature))

907

raise ValueError

940

908

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

941

909

for byte in value))

942

910

prop(value)

1100

1068

interface_names.add(alt_interface)

1101

1069

# Is this a D-Bus signal?

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1070

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

1103

# Extract the original non-method undecorated

1104

# function by black magic

1071

# Extract the original non-method function by

1072

# black magic

1105

1073

nonmethod_func = (dict(

1106

1074

zip(attribute.func_code.co_freevars,

1107

1075

attribute.__closure__))["func"]

1705

1673

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

1706

1674

try:

1707

1675

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

1708

raise RuntimeError(line)

1676

raise RuntimeError

1709

1677

except (ValueError, IndexError, RuntimeError) as error:

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1678

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

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1679

return

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1886

1919

1887

def add_pipe(self, parent_pipe, proc):

1920

1888

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

1921

raise NotImplementedError()

1889

raise NotImplementedError

1922

1890

1923

1891

1924

1892

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

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1948

try:

1981

1949

self.socket.setsockopt(socket.SOL_SOCKET,

1982

1950

SO_BINDTODEVICE,

1983

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

1951

str(self.interface

1952

+ '\0'))

1984

1953

except socket.error as error:

1985

1954

if error.errno == errno.EPERM:

1986

logger.error("No permission to bind to"

1987

" interface %s", self.interface)

1955

logger.error("No permission to"

1956

" bind to interface %s",

1957

self.interface)

1988

1958

elif error.errno == errno.ENOPROTOOPT:

1989

1959

logger.error("SO_BINDTODEVICE not available;"

1990

1960

" cannot bind to interface %s",

1991

1961

self.interface)

1992

1962

elif error.errno == errno.ENODEV:

1993

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

1994

" cannot bind", self.interface)

1963

logger.error("Interface %s does not"

1964

" exist, cannot bind",

1965

self.interface)

1995

1966

else:

1996

1967

raise

1997

1968

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

2000

1971

if self.address_family == socket.AF_INET6:

2001

1972

any_address = "::" # in6addr_any

2002

1973

else:

2003

any_address = "0.0.0.0" # INADDR_ANY

1974

any_address = socket.INADDR_ANY

2004

1975

self.server_address = (any_address,

2005

1976

self.server_address[1])

2006

1977

elif not self.server_address[1]:

2122

2093

return True

2123

2094

2124

2095

2125

def rfc3339_duration_to_delta(duration):

2126

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

2127

2128

>>> rfc3339_duration_to_delta("P7D")

2129

datetime.timedelta(7)

2130

>>> rfc3339_duration_to_delta("PT60S")

2131

datetime.timedelta(0, 60)

2132

>>> rfc3339_duration_to_delta("PT60M")

2133

datetime.timedelta(0, 3600)

2134

>>> rfc3339_duration_to_delta("PT24H")

2135

datetime.timedelta(1)

2136

>>> rfc3339_duration_to_delta("P1W")

2137

datetime.timedelta(7)

2138

>>> rfc3339_duration_to_delta("PT5M30S")

2139

datetime.timedelta(0, 330)

2140

>>> rfc3339_duration_to_delta("P1DT3M20S")

2141

datetime.timedelta(1, 200)

2142

"""

2143

2144

# Parsing an RFC 3339 duration with regular expressions is not

2145

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

2146

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

2147

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

2148

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

2149

# avoid excessive use of external libraries.

2150

2151

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

2152

Token = collections.namedtuple("Token",

2153

("regexp", # To match token; if

2154

# "value" is not None,

2155

# must have a "group"

2156

# containing digits

2157

"value", # datetime.timedelta or

2158

# None

2159

"followers")) # Tokens valid after

2160

# this token

2161

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

2162

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

2163

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

2164

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

2165

datetime.timedelta(seconds=1),

2166

frozenset((token_end,)))

2167

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

2168

datetime.timedelta(minutes=1),

2169

frozenset((token_second, token_end)))

2170

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

2171

datetime.timedelta(hours=1),

2172

frozenset((token_minute, token_end)))

2173

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

2174

None,

2175

frozenset((token_hour, token_minute,

2176

token_second)))

2177

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

2178

datetime.timedelta(days=1),

2179

frozenset((token_time, token_end)))

2180

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

2181

datetime.timedelta(weeks=4),

2182

frozenset((token_day, token_end)))

2183

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

2184

datetime.timedelta(weeks=52),

2185

frozenset((token_month, token_end)))

2186

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

2187

datetime.timedelta(weeks=1),

2188

frozenset((token_end,)))

2189

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

2190

frozenset((token_year, token_month,

2191

token_day, token_time,

2192

token_week))),

2193

# Define starting values

2194

value = datetime.timedelta() # Value so far

2195

found_token = None

2196

followers = frozenset(token_duration,) # Following valid tokens

2197

s = duration # String left to parse

2198

# Loop until end token is found

2199

while found_token is not token_end:

2200

# Search for any currently valid tokens

2201

for token in followers:

2202

match = token.regexp.match(s)

2203

if match is not None:

2204

# Token found

2205

if token.value is not None:

2206

# Value found, parse digits

2207

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

2208

# Add to value so far

2209

value += factor * token.value

2210

# Strip token from string

2211

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

2212

# Go to found token

2213

found_token = token

2214

# Set valid next tokens

2215

followers = found_token.followers

2216

break

2217

else:

2218

# No currently valid tokens were found

2219

raise ValueError("Invalid RFC 3339 duration")

2220

# End token found

2221

return value

2222

2223

2224

2096

def string_to_delta(interval):

2225

2097

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

2226

2098

2237

2109

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

2238

2110

datetime.timedelta(0, 330)

2239

2111

"""

2240

2241

try:

2242

return rfc3339_duration_to_delta(interval)

2243

except ValueError:

2244

pass

2245

2246

2112

timevalue = datetime.timedelta(0)

2247

2113

for s in interval.split():

2248

2114

try:

2261

2127

else:

2262

2128

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

2263

2129

.format(suffix))

2264

except IndexError as e:

2130

except (ValueError, IndexError) as e:

2265

2131

raise ValueError(*(e.args))

2266

2132

timevalue += delta

2267

2133

return timevalue

2311

2177

help="Run self-test")

2312

2178

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

2313

2179

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

2314

" to terminal", default=None)

2180

" to terminal")

2315

2181

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

2316

2182

help="Debug level for stdout output")

2317

2183

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

2324

2190

" files")

2325

2191

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

2326

2192

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

2327

" system bus interface", default=None)

2193

" system bus interface")

2328

2194

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

2329

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

2330

default=None)

2195

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

2331

2196

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

2332

2197

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

2333

" state", default=None)

2198

" state")

2334

2199

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

2335

2200

help="Specify a file descriptor to a network"

2336

2201

" socket to use instead of creating one")

2337

2202

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

2338

2203

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

2339

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

2340

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

2341

2204

2342

2205

options = parser.parse_args()

2343

2206

2352

2215

"port": "",

2353

2216

"debug": "False",

2354

2217

"priority":

2355

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

2218

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

2356

2219

"servicename": "Mandos",

2357

2220

"use_dbus": "True",

2358

2221

"use_ipv6": "True",

2359

2222

"debuglevel": "",

2360

2223

"restore": "True",

2361

2224

"socket": "",

2362

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

2363

"foreground": "False",

2225

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

2364

2226

}

2365

2227

2366

2228

# Parse config file for server-global settings

2371

2233

# Convert the SafeConfigParser object to a dict

2372

2234

server_settings = server_config.defaults()

2373

2235

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

2374

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

2236

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

2375

2237

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

2376

2238

option)

2377

2239

if server_settings["port"]:

2393

2255

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

2394

2256

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

2395

2257

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

2396

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

2258

"statedir", "socket"):

2397

2259

value = getattr(options, option)

2398

2260

if value is not None:

2399

2261

server_settings[option] = value

2402

2264

for option in server_settings.keys():

2403

2265

if type(server_settings[option]) is str:

2404

2266

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

2405

# Force all boolean options to be boolean

2406

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

2407

"foreground"):

2408

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

2409

# Debug implies foreground

2410

if server_settings["debug"]:

2411

server_settings["foreground"] = True

2412

2267

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

2413

2268

2414

2269

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

2420

2275

use_ipv6 = server_settings["use_ipv6"]

2421

2276

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

2422

2277

stored_state_file)

2423

foreground = server_settings["foreground"]

2424

2278

2425

2279

if debug:

2426

2280

initlogger(debug, logging.DEBUG)

2458

2312

use_dbus=use_dbus,

2459

2313

socketfd=(server_settings["socket"]

2460

2314

or None))

2461

if not foreground:

2462

pidfilename = "/run/mandos.pid"

2463

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

2464

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

2465

pidfile = None

2315

if not debug:

2316

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

2466

2317

try:

2467

2318

pidfile = open(pidfilename, "w")

2468

2319

except IOError as e:

2484

2335

os.setuid(uid)

2485

2336

except OSError as error:

2486

2337

if error.errno != errno.EPERM:

2487

raise

2338

raise error

2488

2339

2489

2340

if debug:

2490

2341

# Enable all possible GnuTLS debugging

2507

2358

os.close(null)

2508

2359

2509

2360

# Need to fork before connecting to D-Bus

2510

if not foreground:

2361

if not debug:

2511

2362

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

2512

2363

daemon()

2513

2364

2553

2404

old_client_settings = {}

2554

2405

clients_data = {}

2555

2406

2556

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

2557

global wnull

2558

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

2559

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

2560

# mode

2561

if debug or not foreground:

2562

wnull.close()

2563

2564

2407

# Get client data and settings from last running state.

2565

2408

if server_settings["restore"]:

2566

2409

try:

2582

2425

2583

2426

with PGPEngine() as pgp:

2584

2427

for client_name, client in clients_data.iteritems():

2585

# Skip removed clients

2586

if client_name not in client_settings:

2587

continue

2588

2589

2428

# Decide which value to use after restoring saved state.

2590

2429

# We have three different values: Old config file,

2591

2430

# new config file, and saved state.

2653

2492

# Create all client objects

2654

2493

for client_name, client in clients_data.iteritems():

2655

2494

tcp_server.clients[client_name] = client_class(

2656

name = client_name, settings = client,

2657

server_settings = server_settings)

2495

name = client_name, settings = client)

2658

2496

2659

2497

if not tcp_server.clients:

2660

2498

logger.warning("No clients defined")

2661

2499

2662

if not foreground:

2663

if pidfile is not None:

2664

try:

2665

with pidfile:

2666

pid = os.getpid()

2667

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

2668

except IOError:

2669

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

2670

pidfilename, pid)

2671

del pidfile

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

2672

2512

del pidfilename

2673

2513

2674

2514

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

2743

2583

service.cleanup()

2744

2584

2745

2585

multiprocessing.active_children()

2746

wnull.close()

2747

2586

if not (tcp_server.clients or client_settings):

2748

2587

return

2749

2588

2761

2600

# A list of attributes that can not be pickled

2762

2601

# + secret.

2763

2602

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

2764

"checker", "server_settings"))

2603

"checker"))

2765

2604

for name, typ in (inspect.getmembers

2766

2605

(dbus.service.Object)):

2767

2606

exclude.add(name)

2795

2634

else:

2796

2635

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

2797

2636

exc_info=e)

2798

raise

2637

raise e

2799

2638

2800

2639

# Delete all clients, and settings from config

2801

2640

while tcp_server.clients: