diff --git a/hbmqtt/broker.py b/hbmqtt/broker.py
index fdc8013..45f441c 100644
--- a/hbmqtt/broker.py
+++ b/hbmqtt/broker.py
@@ -636,25 +636,26 @@ class Broker:
     def authenticate(self, session: Session, listener):
         """
         This method call the authenticate method on registered plugins to test user authentication.
-        User is considered authenticated if at least one plugin returns True.
+        User is considered authenticated if all plugins called returns True.
+        Plugins authenticate() method are supposed to return :
+         - True if user is authentication succeed
+         - False if user authentication fails
+         - None if authentication can't be achieved (then plugin result is then ignored)
         :param session:
         :param listener:
         :return:
         """
         returns = yield from self.plugins_manager.map_plugin_coro("authenticate", session=session)
-        if not returns:
-            self.logger.debug("Authentication plugin results: %r" % returns)
-            return True
-        else:
-            for res in returns:
-                if res:
-                    # Consider authentication succeed if at least one plugin returns True
-                    return True
-            # If all plugins returned False, authentications is failed
-            return True
-
-        # TODO : Handle client authentication here
-        return True
+        auth_result = True
+        for plugin in returns:
+            res = returns[plugin]
+            if res is False:
+                auth_result = False
+                self.logger.debug("Authentication failed due to '%s' plugin result: %s" % (plugin.name, res))
+            else:
+                self.logger.debug("'%s' plugin result: %s" % (plugin.name, res))
+        # If all plugins returned True, authentication is success
+        return auth_result
 
     def retain_message(self, source_session, topic_name, data, qos=None):
         if data is not None and data != b'':
diff --git a/hbmqtt/plugins/authentication.py b/hbmqtt/plugins/authentication.py
index 88a1247..67256cc 100644
--- a/hbmqtt/plugins/authentication.py
+++ b/hbmqtt/plugins/authentication.py
@@ -2,6 +2,7 @@
 #
 # See the file license.txt for copying permission.
 import logging
+import asyncio
 from passlib.apps import custom_app_context as pwd_context
 
 
@@ -25,6 +26,7 @@ class AnonymousAuthPlugin(BaseAuthPlugin):
     def __init__(self, context):
         super().__init__(context)
 
+    @asyncio.coroutine
     def authenticate(self, *args, **kwargs):
         authenticated = super().authenticate(*args, **kwargs)
         if authenticated:
@@ -72,14 +74,18 @@ class FileAuthPlugin(BaseAuthPlugin):
         else:
             self.context.logger.debug("Configuration parameter 'password_file' not found")
 
+    @asyncio.coroutine
     def authenticate(self, *args, **kwargs):
         authenticated = super().authenticate(*args, **kwargs)
         if authenticated:
             session = kwargs.get('session', None)
-            hash = self._users.get(session.username, None)
-            if not hash:
-                authenticated = False
-                self.context.logger.debug("User '%s' unknown" % session.username)
+            if session.username:
+                hash = self._users.get(session.username, None)
+                if not hash:
+                    authenticated = False
+                    self.context.logger.debug("No hash found for user '%s'" % session.username)
+                else:
+                    authenticated = pwd_context.verify(session.password, hash)
             else:
-                authenticated = pwd_context.verify(session.password, hash)
+                return None
         return authenticated
diff --git a/samples/broker_start.py b/samples/broker_start.py
index 2f5e1ef..5e44e6f 100644
--- a/samples/broker_start.py
+++ b/samples/broker_start.py
@@ -1,5 +1,6 @@
 import logging
 import asyncio
+import os
 from hbmqtt.broker import Broker
 
 logger = logging.getLogger(__name__)
@@ -19,6 +20,11 @@ config = {
         },
     },
     'sys_interval': 0,
+    'auth': {
+        'allow-anonymous': False,
+        'password-file': os.path.join(os.path.dirname(os.path.realpath(__file__)), "passwd")
+
+    }
 }
 
 broker = Broker(config)
diff --git a/samples/client_publish.py b/samples/client_publish.py
index 06f4f5a..af18aff 100644
--- a/samples/client_publish.py
+++ b/samples/client_publish.py
@@ -45,7 +45,7 @@ def test_coro():
 @asyncio.coroutine
 def test_coro2():
     try:
-        future = yield from C.connect('mqtt://localhost:1883/')
+        future = yield from C.connect('mqtt://test:test@localhost:1883/')
         future.add_done_callback(disconnected)
         yield from asyncio.wait([asyncio.async(C.publish('a/b', b'TEST MESSAGE WITH QOS_1', qos=0x01))])
         logger.info("messages published")
diff --git a/samples/passwd b/samples/passwd
index e69de29..9a3971e 100644
--- a/samples/passwd
+++ b/samples/passwd
@@ -0,0 +1,2 @@
+# Test user with 'test' password encrypted with sha-512
+test:$6$l4zQEHEcowc1Pnv4$HHrh8xnsZoLItQ8BmpFHM4r6q5UqK3DnXp2GaTm5zp5buQ7NheY3Xt9f6godVKbEtA.hOC7IEDwnok3pbAOip.
\ No newline at end of file
diff --git a/setup.py b/setup.py
index 3ca12d3..0e7e868 100644
--- a/setup.py
+++ b/setup.py
@@ -41,6 +41,7 @@ setup(
 #            'event_logger_plugin = hbmqtt.plugins.logging:EventLoggerPlugin',
             'packet_logger_plugin = hbmqtt.plugins.logging:PacketLoggerPlugin',
             'auth_anonymous = hbmqtt.plugins.authentication:AnonymousAuthPlugin',
+            'auth_file = hbmqtt.plugins.authentication:FileAuthPlugin',
         ],
         'hbmqtt.client.plugins': [
             'packet_logger_plugin = hbmqtt.plugins.logging:PacketLoggerPlugin',
diff --git a/tests/plugins/test_authentication.py b/tests/plugins/test_authentication.py
index b548149..6ca44e8 100644
--- a/tests/plugins/test_authentication.py
+++ b/tests/plugins/test_authentication.py
@@ -5,6 +5,7 @@
 import unittest
 import logging
 import os
+import asyncio
 from hbmqtt.plugins.manager import BaseContext
 from hbmqtt.plugins.authentication import AnonymousAuthPlugin, FileAuthPlugin
 from hbmqtt.session import Session
@@ -14,6 +15,9 @@ logging.basicConfig(level=logging.DEBUG, format=formatter)
 
 
 class TestAnonymousAuthPlugin(unittest.TestCase):
+    def setUp(self):
+        self.loop = asyncio.new_event_loop()
+
     def test_allow_anonymous(self):
         context = BaseContext()
         context.logger = logging.getLogger(__name__)
@@ -25,7 +29,8 @@ class TestAnonymousAuthPlugin(unittest.TestCase):
         s = Session()
         s.username = ""
         auth_plugin = AnonymousAuthPlugin(context)
-        self.assertTrue(auth_plugin.authenticate())
+        ret = self.loop.run_until_complete(auth_plugin.authenticate(session=s))
+        self.assertTrue(ret)
 
     def test_disallow_anonymous(self):
         context = BaseContext()
@@ -38,7 +43,8 @@ class TestAnonymousAuthPlugin(unittest.TestCase):
         s = Session()
         s.username = ""
         auth_plugin = AnonymousAuthPlugin(context)
-        self.assertFalse(auth_plugin.authenticate(session=s))
+        ret = self.loop.run_until_complete(auth_plugin.authenticate(session=s))
+        self.assertFalse(ret)
 
     def test_allow_nonanonymous(self):
         context = BaseContext()
@@ -51,10 +57,14 @@ class TestAnonymousAuthPlugin(unittest.TestCase):
         s = Session()
         s.username = "test"
         auth_plugin = AnonymousAuthPlugin(context)
-        self.assertTrue(auth_plugin.authenticate(session=s))
+        ret = self.loop.run_until_complete(auth_plugin.authenticate(session=s))
+        self.assertTrue(ret)
 
 
 class TestFileAuthPlugin(unittest.TestCase):
+    def setUp(self):
+        self.loop = asyncio.new_event_loop()
+
     def test_allow(self):
         context = BaseContext()
         context.logger = logging.getLogger(__name__)
@@ -67,7 +77,8 @@ class TestFileAuthPlugin(unittest.TestCase):
         s.username = "user"
         s.password = "test"
         auth_plugin = FileAuthPlugin(context)
-        self.assertTrue(auth_plugin.authenticate(session=s))
+        ret = self.loop.run_until_complete(auth_plugin.authenticate(session=s))
+        self.assertTrue(ret)
 
     def test_wrong_password(self):
         context = BaseContext()
@@ -81,7 +92,8 @@ class TestFileAuthPlugin(unittest.TestCase):
         s.username = "user"
         s.password = "wrong password"
         auth_plugin = FileAuthPlugin(context)
-        self.assertFalse(auth_plugin.authenticate(session=s))
+        ret = self.loop.run_until_complete(auth_plugin.authenticate(session=s))
+        self.assertFalse(ret)
 
     def test_unknown_password(self):
         context = BaseContext()
@@ -95,4 +107,5 @@ class TestFileAuthPlugin(unittest.TestCase):
         s.username = "some user"
         s.password = "some password"
         auth_plugin = FileAuthPlugin(context)
-        self.assertFalse(auth_plugin.authenticate(session=s))
+        ret = self.loop.run_until_complete(auth_plugin.authenticate(session=s))
+        self.assertFalse(ret)