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11
# "AvahiService" class, and some lines in "main".
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# Everything else is
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# Copyright © 2008-2012 Teddy Hogeborn
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# Copyright © 2008-2012 Björn Påhlsson
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# Copyright © 2008-2014 Teddy Hogeborn
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# Copyright © 2008-2014 Björn Påhlsson
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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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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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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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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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self.gnupgargs = ['--batch',
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'--home', self.tempdir,
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def __enter__(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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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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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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with contextlib.closing(proc.handles['stdout']) as f:
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ciphertext = f.read()
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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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passfile.write(passphrase)
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proc = subprocess.Popen(['gpg', '--symmetric',
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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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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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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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with contextlib.closing(proc.handles['stdout']) as f:
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decrypted_plaintext = f.read()
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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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passfile.write(passphrase)
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proc = subprocess.Popen(['gpg', '--decrypt',
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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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if proc.returncode != 0:
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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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"""Add the new name to the syslog messages"""
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ret = AvahiService.rename(self)
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syslogger.setFormatter(logging.Formatter
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('Mandos ({0}) [%(process)d]:'
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('Mandos ({}) [%(process)d]:'
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' %(levelname)s: %(message)s'
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.format(self.name)))
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def timedelta_to_milliseconds(td):
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"Convert a datetime.timedelta() to milliseconds"
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return ((td.days * 24 * 60 * 60 * 1000)
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+ (td.seconds * 1000)
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+ (td.microseconds // 1000))
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class Client(object):
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"""A representation of a client host served by this server.
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"enabled": "True",
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def timeout_milliseconds(self):
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"Return the 'timeout' attribute in milliseconds"
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return timedelta_to_milliseconds(self.timeout)
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def extended_timeout_milliseconds(self):
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"Return the 'extended_timeout' attribute in milliseconds"
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return timedelta_to_milliseconds(self.extended_timeout)
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def interval_milliseconds(self):
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"Return the 'interval' attribute in milliseconds"
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return timedelta_to_milliseconds(self.interval)
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def approval_delay_milliseconds(self):
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return timedelta_to_milliseconds(self.approval_delay)
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def config_parser(config):
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"""Construct a new dict of client settings of this form:
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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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if server_settings is None:
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self.server_settings = server_settings
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# adding all client settings
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for setting, value in settings.iteritems():
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for setting, value in settings.items():
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setattr(self, setting, value)
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if self.checker_initiator_tag is not None:
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gobject.source_remove(self.checker_initiator_tag)
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self.checker_initiator_tag = (gobject.timeout_add
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(self.interval_milliseconds(),
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.total_seconds() * 1000),
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self.start_checker))
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# Schedule a disable() when 'timeout' has passed
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if self.disable_initiator_tag is not None:
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gobject.source_remove(self.disable_initiator_tag)
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self.disable_initiator_tag = (gobject.timeout_add
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(self.timeout_milliseconds(),
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.total_seconds() * 1000),
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# Also start a new checker *right now*.
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self.start_checker()
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self.disable_initiator_tag = None
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if getattr(self, "enabled", False):
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self.disable_initiator_tag = (gobject.timeout_add
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(timedelta_to_milliseconds
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(timeout), self.disable))
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(int(timeout.total_seconds()
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* 1000), self.disable))
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self.expires = datetime.datetime.utcnow() + timeout
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def need_approval(self):
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# If a checker exists, make sure it is not a zombie
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pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
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except (AttributeError, OSError) as error:
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if (isinstance(error, OSError)
685
and error.errno != errno.ECHILD):
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except AttributeError:
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except OSError as error:
679
if error.errno != errno.ECHILD:
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logger.warning("Checker was a zombie")
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# Start a new checker if needed
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if self.checker is None:
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# Escape attributes for the shell
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escaped_attrs = dict(
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(attr, re.escape(unicode(getattr(self, attr))))
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self.runtime_expansions)
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escaped_attrs = { attr:
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re.escape(unicode(getattr(self,
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for attr in self.runtime_expansions }
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command = self.checker_command % escaped_attrs
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except TypeError as error:
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# in normal mode, that is already done by daemon(),
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# and in debug mode we don't want to. (Stdin is
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# always replaced by /dev/null.)
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# The exception is when not debugging but nevertheless
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# running in the foreground; use the previously
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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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self.checker = subprocess.Popen(command,
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except OSError as error:
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logger.error("Failed to start subprocess",
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724
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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# The checker may have completed before the gobject
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# watch was added. Check for this.
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pid, status = os.waitpid(self.checker.pid, os.WNOHANG)
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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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gobject.source_remove(self.checker_callback_tag)
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self.checker_callback(pid, status, command)
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# "Set" method, so we fail early here:
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if byte_arrays and signature != "ay":
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raise ValueError("Byte arrays not supported for non-'ay'"
768
" signature {0!r}".format(signature))
780
" signature {!r}".format(signature))
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def decorator(func):
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func._dbus_is_property = True
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func._dbus_interface = dbus_interface
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If called like _is_dbus_thing("method") it returns a function
851
863
suitable for use as predicate to inspect.getmembers().
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return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),
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return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),
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def _get_all_dbus_things(self, thing):
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# Add interface annotation tags
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for annotation, value in dict(
986
1000
itertools.chain.from_iterable(
987
annotations().iteritems()
1001
annotations().items()
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for name, annotations in
989
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self._get_all_dbus_things("interface")
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if name == if_tag.getAttribute("name")
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ann_tag = document.createElement("annotation")
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ann_tag.setAttribute("name", annotation)
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ann_tag.setAttribute("value", value)
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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 function by
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# Extract the original non-method undecorated
1087
# function by black magic
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nonmethod_func = (dict(
1075
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zip(attribute.func_code.co_freevars,
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attribute.__closure__))["func"]
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approval_delay = notifychangeproperty(dbus.UInt64,
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1286
"ApprovalDelay",
1274
timedelta_to_milliseconds)
1288
lambda td: td.total_seconds()
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approval_duration = notifychangeproperty(
1276
1291
dbus.UInt64, "ApprovalDuration",
1277
type_func = timedelta_to_milliseconds)
1292
type_func = lambda td: td.total_seconds() * 1000)
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host = notifychangeproperty(dbus.String, "Host")
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timeout = notifychangeproperty(dbus.UInt64, "Timeout",
1281
timedelta_to_milliseconds)
1295
type_func = lambda td:
1296
td.total_seconds() * 1000)
1282
1297
extended_timeout = notifychangeproperty(
1283
1298
dbus.UInt64, "ExtendedTimeout",
1284
type_func = timedelta_to_milliseconds)
1299
type_func = lambda td: td.total_seconds() * 1000)
1285
1300
interval = notifychangeproperty(dbus.UInt64,
1288
timedelta_to_milliseconds)
1303
lambda td: td.total_seconds()
1289
1305
checker_command = notifychangeproperty(dbus.String, "Checker")
1291
1307
del notifychangeproperty
1319
1335
*args, **kwargs)
1321
1337
def start_checker(self, *args, **kwargs):
1322
old_checker = self.checker
1323
if self.checker is not None:
1324
old_checker_pid = self.checker.pid
1326
old_checker_pid = None
1338
old_checker_pid = getattr(self.checker, "pid", None)
1327
1339
r = Client.start_checker(self, *args, **kwargs)
1328
1340
# Only if new checker process was started
1329
1341
if (self.checker is not None
1339
1351
def approve(self, value=True):
1340
1352
self.approved = value
1341
gobject.timeout_add(timedelta_to_milliseconds
1342
(self.approval_duration),
1343
self._reset_approved)
1353
gobject.timeout_add(int(self.approval_duration.total_seconds()
1354
* 1000), self._reset_approved)
1344
1355
self.send_changedstate()
1346
1357
## D-Bus methods, signals & properties
1547
1559
gobject.source_remove(self.disable_initiator_tag)
1548
1560
self.disable_initiator_tag = (
1549
1561
gobject.timeout_add(
1550
timedelta_to_milliseconds(self.expires - now),
1562
int((self.expires - now).total_seconds()
1563
* 1000), self.disable))
1553
1565
# ExtendedTimeout - property
1554
1566
@dbus_service_property(_interface, signature="t",
1555
1567
access="readwrite")
1556
1568
def ExtendedTimeout_dbus_property(self, value=None):
1557
1569
if value is None: # get
1558
return dbus.UInt64(self.extended_timeout_milliseconds())
1570
return dbus.UInt64(self.extended_timeout.total_seconds()
1559
1572
self.extended_timeout = datetime.timedelta(0, 0, 0, value)
1561
1574
# Interval - property
1563
1576
access="readwrite")
1564
1577
def Interval_dbus_property(self, value=None):
1565
1578
if value is None: # get
1566
return dbus.UInt64(self.interval_milliseconds())
1579
return dbus.UInt64(self.interval.total_seconds() * 1000)
1567
1580
self.interval = datetime.timedelta(0, 0, 0, value)
1568
1581
if getattr(self, "checker_initiator_tag", None) is None:
1742
1755
#wait until timeout or approved
1743
1756
time = datetime.datetime.now()
1744
1757
client.changedstate.acquire()
1745
client.changedstate.wait(
1746
float(timedelta_to_milliseconds(delay)
1758
client.changedstate.wait(delay.total_seconds())
1748
1759
client.changedstate.release()
1749
1760
time2 = datetime.datetime.now()
1750
1761
if (time2 - time) >= delay:
2158
2169
token_duration = Token(re.compile(r"P"), None,
2159
2170
frozenset((token_year, token_month,
2160
2171
token_day, token_time,
2162
2173
# Define starting values
2163
2174
value = datetime.timedelta() # Value so far
2164
2175
found_token = None
2165
followers = frozenset(token_duration,) # Following valid tokens
2176
followers = frozenset((token_duration,)) # Following valid tokens
2166
2177
s = duration # String left to parse
2167
2178
# Loop until end token is found
2168
2179
while found_token is not token_end:
2228
2239
elif suffix == "w":
2229
2240
delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)
2231
raise ValueError("Unknown suffix {0!r}"
2242
raise ValueError("Unknown suffix {!r}"
2232
2243
.format(suffix))
2233
except (ValueError, IndexError) as e:
2244
except IndexError as e:
2234
2245
raise ValueError(*(e.args))
2235
2246
timevalue += delta
2236
2247
return timevalue
2251
2262
# Close all standard open file descriptors
2252
2263
null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)
2253
2264
if not stat.S_ISCHR(os.fstat(null).st_mode):
2254
raise OSError(errno.ENODEV,
2255
"{0} not a character device"
2265
raise OSError(errno.ENODEV, "{} not a character device"
2256
2266
.format(os.devnull))
2257
2267
os.dup2(null, sys.stdin.fileno())
2258
2268
os.dup2(null, sys.stdout.fileno())
2269
2279
parser = argparse.ArgumentParser()
2270
2280
parser.add_argument("-v", "--version", action="version",
2271
version = "%(prog)s {0}".format(version),
2281
version = "%(prog)s {}".format(version),
2272
2282
help="show version number and exit")
2273
2283
parser.add_argument("-i", "--interface", metavar="IF",
2274
2284
help="Bind to interface IF")
2280
2290
help="Run self-test")
2281
2291
parser.add_argument("--debug", action="store_true",
2282
2292
help="Debug mode; run in foreground and log"
2293
" to terminal", default=None)
2284
2294
parser.add_argument("--debuglevel", metavar="LEVEL",
2285
2295
help="Debug level for stdout output")
2286
2296
parser.add_argument("--priority", help="GnuTLS"
2294
2304
parser.add_argument("--no-dbus", action="store_false",
2295
2305
dest="use_dbus", help="Do not provide D-Bus"
2296
" system bus interface")
2306
" system bus interface", default=None)
2297
2307
parser.add_argument("--no-ipv6", action="store_false",
2298
dest="use_ipv6", help="Do not use IPv6")
2308
dest="use_ipv6", help="Do not use IPv6",
2299
2310
parser.add_argument("--no-restore", action="store_false",
2300
2311
dest="restore", help="Do not restore stored"
2312
" state", default=None)
2302
2313
parser.add_argument("--socket", type=int,
2303
2314
help="Specify a file descriptor to a network"
2304
2315
" socket to use instead of creating one")
2305
2316
parser.add_argument("--statedir", metavar="DIR",
2306
2317
help="Directory to save/restore state in")
2307
2318
parser.add_argument("--foreground", action="store_true",
2308
help="Run in foreground")
2319
help="Run in foreground", default=None)
2320
parser.add_argument("--no-zeroconf", action="store_false",
2321
dest="zeroconf", help="Do not use Zeroconf",
2310
2324
options = parser.parse_args()
2312
2326
if options.check:
2328
fail_count, test_count = doctest.testmod()
2329
sys.exit(os.EX_OK if fail_count == 0 else 1)
2317
2331
# Default values for config file for server-global settings
2318
2332
server_defaults = { "interface": "",
2361
2376
for option in ("interface", "address", "port", "debug",
2362
2377
"priority", "servicename", "configdir",
2363
2378
"use_dbus", "use_ipv6", "debuglevel", "restore",
2364
"statedir", "socket", "foreground"):
2379
"statedir", "socket", "foreground", "zeroconf"):
2365
2380
value = getattr(options, option)
2366
2381
if value is not None:
2367
2382
server_settings[option] = value
2370
2385
for option in server_settings.keys():
2371
2386
if type(server_settings[option]) is str:
2372
2387
server_settings[option] = unicode(server_settings[option])
2388
# Force all boolean options to be boolean
2389
for option in ("debug", "use_dbus", "use_ipv6", "restore",
2390
"foreground", "zeroconf"):
2391
server_settings[option] = bool(server_settings[option])
2373
2392
# Debug implies foreground
2374
2393
if server_settings["debug"]:
2375
2394
server_settings["foreground"] = True
2378
2397
##################################################################
2399
if (not server_settings["zeroconf"] and
2400
not (server_settings["port"]
2401
or server_settings["socket"] != "")):
2402
parser.error("Needs port or socket to work without"
2380
2405
# For convenience
2381
2406
debug = server_settings["debug"]
2382
2407
debuglevel = server_settings["debuglevel"]
2420
2449
gnutls_priority=
2421
2450
server_settings["priority"],
2422
2451
use_dbus=use_dbus,
2423
socketfd=(server_settings["socket"]
2425
2453
if not foreground:
2426
pidfilename = "/var/run/mandos.pid"
2454
pidfilename = "/run/mandos.pid"
2455
if not os.path.isdir("/run/."):
2456
pidfilename = "/var/run/mandos.pid"
2429
2459
pidfile = open(pidfilename, "w")
2495
2525
use_dbus = False
2496
2526
server_settings["use_dbus"] = False
2497
2527
tcp_server.use_dbus = False
2498
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2499
service = AvahiServiceToSyslog(name =
2500
server_settings["servicename"],
2501
servicetype = "_mandos._tcp",
2502
protocol = protocol, bus = bus)
2503
if server_settings["interface"]:
2504
service.interface = (if_nametoindex
2505
(str(server_settings["interface"])))
2529
protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET
2530
service = AvahiServiceToSyslog(name =
2531
server_settings["servicename"],
2532
servicetype = "_mandos._tcp",
2533
protocol = protocol, bus = bus)
2534
if server_settings["interface"]:
2535
service.interface = (if_nametoindex
2536
(str(server_settings["interface"])))
2507
2538
global multiprocessing_manager
2508
2539
multiprocessing_manager = multiprocessing.Manager()
2535
2574
"EOFError:", exc_info=e)
2537
2576
with PGPEngine() as pgp:
2538
for client_name, client in clients_data.iteritems():
2577
for client_name, client in clients_data.items():
2578
# Skip removed clients
2579
if client_name not in client_settings:
2539
2582
# Decide which value to use after restoring saved state.
2540
2583
# We have three different values: Old config file,
2541
2584
# new config file, and saved state.
2562
2605
if datetime.datetime.utcnow() >= client["expires"]:
2563
2606
if not client["last_checked_ok"]:
2564
2607
logger.warning(
2565
"disabling client {0} - Client never "
2608
"disabling client {} - Client never "
2566
2609
"performed a successful checker"
2567
2610
.format(client_name))
2568
2611
client["enabled"] = False
2569
2612
elif client["last_checker_status"] != 0:
2570
2613
logger.warning(
2571
"disabling client {0} - Client "
2572
"last checker failed with error code {1}"
2614
"disabling client {} - Client last"
2615
" checker failed with error code {}"
2573
2616
.format(client_name,
2574
2617
client["last_checker_status"]))
2575
2618
client["enabled"] = False
2601
2644
clients_data[client_name] = client_settings[client_name]
2603
2646
# Create all client objects
2604
for client_name, client in clients_data.iteritems():
2647
for client_name, client in clients_data.items():
2605
2648
tcp_server.clients[client_name] = client_class(
2606
name = client_name, settings = client)
2649
name = client_name, settings = client,
2650
server_settings = server_settings)
2608
2652
if not tcp_server.clients:
2609
2653
logger.warning("No clients defined")
2709
2755
# A list of attributes that can not be pickled
2711
exclude = set(("bus", "changedstate", "secret",
2757
exclude = { "bus", "changedstate", "secret",
2758
"checker", "server_settings" }
2713
2759
for name, typ in (inspect.getmembers
2714
2760
(dbus.service.Object)):
2715
2761
exclude.add(name)
2738
2784
except NameError:
2740
2786
if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):
2741
logger.warning("Could not save persistent state: {0}"
2787
logger.warning("Could not save persistent state: {}"
2742
2788
.format(os.strerror(e.errno)))
2744
2790
logger.warning("Could not save persistent state:",
2748
2794
# Delete all clients, and settings from config
2749
2795
while tcp_server.clients:
2773
2819
tcp_server.server_activate()
2775
2821
# Find out what port we got
2776
service.port = tcp_server.socket.getsockname()[1]
2823
service.port = tcp_server.socket.getsockname()[1]
2778
2825
logger.info("Now listening on address %r, port %d,"
2779
2826
" flowinfo %d, scope_id %d",
2785
2832
#service.interface = tcp_server.socket.getsockname()[3]
2788
# From the Avahi example code
2791
except dbus.exceptions.DBusException as error:
2792
logger.critical("D-Bus Exception", exc_info=error)
2795
# End of Avahi example code
2836
# From the Avahi example code
2839
except dbus.exceptions.DBusException as error:
2840
logger.critical("D-Bus Exception", exc_info=error)
2843
# End of Avahi example code
2797
2845
gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,
2798
2846
lambda *args, **kwargs: