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227 lines
7.4 KiB
227 lines
7.4 KiB
"""ZAP Authenticator in a Python Thread.
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.. versionadded:: 14.1
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"""
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# Copyright (C) PyZMQ Developers
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# Distributed under the terms of the Modified BSD License.
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import time
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import logging
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from threading import Thread, Event
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import zmq
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from zmq.utils import jsonapi
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from zmq.utils.strtypes import bytes, unicode, b, u
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import sys
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from .base import Authenticator
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class AuthenticationThread(Thread):
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"""A Thread for running a zmq Authenticator
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This is run in the background by ThreadedAuthenticator
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"""
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def __init__(self, context, endpoint, encoding='utf-8', log=None, authenticator=None):
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super(AuthenticationThread, self).__init__()
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self.context = context or zmq.Context.instance()
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self.encoding = encoding
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self.log = log = log or logging.getLogger('zmq.auth')
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self.started = Event()
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self.authenticator = authenticator or Authenticator(context, encoding=encoding, log=log)
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# create a socket to communicate back to main thread.
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self.pipe = context.socket(zmq.PAIR)
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self.pipe.linger = 1
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self.pipe.connect(endpoint)
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def run(self):
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"""Start the Authentication Agent thread task"""
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self.authenticator.start()
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self.started.set()
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zap = self.authenticator.zap_socket
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poller = zmq.Poller()
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poller.register(self.pipe, zmq.POLLIN)
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poller.register(zap, zmq.POLLIN)
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while True:
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try:
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socks = dict(poller.poll())
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except zmq.ZMQError:
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break # interrupted
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if self.pipe in socks and socks[self.pipe] == zmq.POLLIN:
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# Make sure all API requests are processed before
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# looking at the ZAP socket.
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while True:
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try:
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msg = self.pipe.recv_multipart(flags=zmq.NOBLOCK)
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except zmq.Again:
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break
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terminate = self._handle_pipe(msg)
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if terminate:
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break
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if terminate:
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break
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if zap in socks and socks[zap] == zmq.POLLIN:
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self._handle_zap()
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self.pipe.close()
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self.authenticator.stop()
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def _handle_zap(self):
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"""
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Handle a message from the ZAP socket.
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"""
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msg = self.authenticator.zap_socket.recv_multipart()
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if not msg: return
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self.authenticator.handle_zap_message(msg)
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def _handle_pipe(self, msg):
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"""
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Handle a message from front-end API.
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"""
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terminate = False
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if msg is None:
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terminate = True
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return terminate
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command = msg[0]
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self.log.debug("auth received API command %r", command)
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if command == b'ALLOW':
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addresses = [u(m, self.encoding) for m in msg[1:]]
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try:
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self.authenticator.allow(*addresses)
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except Exception as e:
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self.log.exception("Failed to allow %s", addresses)
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elif command == b'DENY':
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addresses = [u(m, self.encoding) for m in msg[1:]]
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try:
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self.authenticator.deny(*addresses)
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except Exception as e:
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self.log.exception("Failed to deny %s", addresses)
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elif command == b'PLAIN':
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domain = u(msg[1], self.encoding)
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json_passwords = msg[2]
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self.authenticator.configure_plain(domain, jsonapi.loads(json_passwords))
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elif command == b'CURVE':
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# For now we don't do anything with domains
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domain = u(msg[1], self.encoding)
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# If location is CURVE_ALLOW_ANY, allow all clients. Otherwise
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# treat location as a directory that holds the certificates.
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location = u(msg[2], self.encoding)
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self.authenticator.configure_curve(domain, location)
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elif command == b'TERMINATE':
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terminate = True
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else:
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self.log.error("Invalid auth command from API: %r", command)
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return terminate
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def _inherit_docstrings(cls):
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"""inherit docstrings from Authenticator, so we don't duplicate them"""
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for name, method in cls.__dict__.items():
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if name.startswith('_') or not callable(method):
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continue
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upstream_method = getattr(Authenticator, name, None)
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if not method.__doc__:
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method.__doc__ = upstream_method.__doc__
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return cls
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@_inherit_docstrings
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class ThreadAuthenticator(object):
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"""Run ZAP authentication in a background thread"""
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context = None
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log = None
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encoding = None
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pipe = None
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pipe_endpoint = ''
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thread = None
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auth = None
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def __init__(self, context=None, encoding='utf-8', log=None):
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self.context = context or zmq.Context.instance()
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self.log = log
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self.encoding = encoding
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self.pipe = None
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self.pipe_endpoint = "inproc://{0}.inproc".format(id(self))
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self.thread = None
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# proxy base Authenticator attributes
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def __setattr__(self, key, value):
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for obj in [self] + self.__class__.mro():
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if key in obj.__dict__:
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object.__setattr__(self, key, value)
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return
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setattr(self.thread.authenticator, key, value)
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def __getattr__(self, key):
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try:
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object.__getattr__(self, key)
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except AttributeError:
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return getattr(self.thread.authenticator, key)
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def allow(self, *addresses):
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self.pipe.send_multipart([b'ALLOW'] + [b(a, self.encoding) for a in addresses])
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def deny(self, *addresses):
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self.pipe.send_multipart([b'DENY'] + [b(a, self.encoding) for a in addresses])
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def configure_plain(self, domain='*', passwords=None):
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self.pipe.send_multipart([b'PLAIN', b(domain, self.encoding), jsonapi.dumps(passwords or {})])
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def configure_curve(self, domain='*', location=''):
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domain = b(domain, self.encoding)
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location = b(location, self.encoding)
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self.pipe.send_multipart([b'CURVE', domain, location])
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def configure_curve_callback(self, domain='*', credentials_provider=None):
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self.thread.authenticator.configure_curve_callback(domain, credentials_provider=credentials_provider)
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def start(self):
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"""Start the authentication thread"""
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# create a socket to communicate with auth thread.
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self.pipe = self.context.socket(zmq.PAIR)
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self.pipe.linger = 1
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self.pipe.bind(self.pipe_endpoint)
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self.thread = AuthenticationThread(self.context, self.pipe_endpoint, encoding=self.encoding, log=self.log)
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self.thread.start()
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# Event.wait:Changed in version 2.7: Previously, the method always returned None.
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if sys.version_info < (2,7):
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self.thread.started.wait(timeout=10)
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else:
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if not self.thread.started.wait(timeout=10):
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raise RuntimeError("Authenticator thread failed to start")
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def stop(self):
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"""Stop the authentication thread"""
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if self.pipe:
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self.pipe.send(b'TERMINATE')
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if self.is_alive():
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self.thread.join()
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self.thread = None
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self.pipe.close()
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self.pipe = None
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def is_alive(self):
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"""Is the ZAP thread currently running?"""
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if self.thread and self.thread.is_alive():
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return True
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return False
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def __del__(self):
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self.stop()
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__all__ = ['ThreadAuthenticator']
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