WSGI middleware for lockout after failed authentications of ec2 access key.

nova/fakememcache.py

@@ -0,0 +1,59 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2010 United States Government as represented by the
+# Administrator of the National Aeronautics and Space Administration.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+"""Super simple fake memcache client."""
+
+import utils
+
+
+class Client(object):
+    """Replicates a tiny subset of memcached client interface."""
+
+    def __init__(self, *args, **kwargs):
+        """Ignores the passed in args"""
+        self.cache = {}
+
+    def get(self, key):
+        """Retrieves the value for a key or None."""
+        (timeout, value) = self.cache.get(key, (0, None))
+        if timeout == 0 or utils.utcnow_ts() < timeout:
+            return value
+        return None
+
+    def set(self, key, value, time=0, min_compress_len=0):
+        """Sets the value for a key."""
+        timeout = 0
+        if time != 0:
+            timeout = utils.utcnow_ts() + time
+        self.cache[key] = (timeout, value)
+        return True
+
+    def add(self, key, value, time=0, min_compress_len=0):
+        """Sets the value for a key if it doesn't exist."""
+        if not self.get(key) is None:
+            return False
+        return self.set(key, value, time, min_compress_len)
+
+    def incr(self, key, delta=1):
+        """Increments the value for a key."""
+        value = self.get(key)
+        if value is None:
+            return None
+        new_value = int(value) + delta
+        self.cache[key] = (self.cache[key][0], str(new_value))
+        return new_value

nova/tests/middleware_unittest.py

@@ -0,0 +1,86 @@
+# vim: tabstop=4 shiftwidth=4 softtabstop=4
+
+# Copyright 2010 United States Government as represented by the
+# Administrator of the National Aeronautics and Space Administration.
+# All Rights Reserved.
+#
+#    Licensed under the Apache License, Version 2.0 (the "License"); you may
+#    not use this file except in compliance with the License. You may obtain
+#    a copy of the License at
+#
+#         http://www.apache.org/licenses/LICENSE-2.0
+#
+#    Unless required by applicable law or agreed to in writing, software
+#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+#    License for the specific language governing permissions and limitations
+#    under the License.
+
+import datetime
+import webob
+import webob.dec
+import webob.exc
+
+from nova.api import ec2
+from nova import flags
+from nova import test
+from nova import utils
+
+
+FLAGS = flags.FLAGS
+
+
+@webob.dec.wsgify
+def conditional_forbid(req):
+    """Helper wsgi app returns 403 if param 'die' is 1."""
+    if 'die' in req.params and req.params['die'] == '1':
+        raise webob.exc.HTTPForbidden()
+    return 'OK'
+
+
+class LockoutTestCase(test.TrialTestCase):
+    """Test case for the Lockout middleware."""
+    def setUp(self):  # pylint: disable-msg=C0103
+        super(LockoutTestCase, self).setUp()
+        utils.set_time_override()
+        self.lockout = ec2.Lockout(conditional_forbid)
+
+    def tearDown(self):  # pylint: disable-msg=C0103
+        utils.clear_time_override()
+        super(LockoutTestCase, self).tearDown()
+
+    def _send_bad_attempts(self, access_key, num_attempts=1):
+        """Fail x."""
+        for i in xrange(num_attempts):
+            req = webob.Request.blank('/?AWSAccessKeyId=%s&die=1' % access_key)
+            self.assertEqual(req.get_response(self.lockout).status_int, 403)
+
+    def _is_locked_out(self, access_key):
+        """Sends a test request to see if key is locked out."""
+        req = webob.Request.blank('/?AWSAccessKeyId=%s' % access_key)
+        return (req.get_response(self.lockout).status_int == 403)
+
+    def test_lockout(self):
+        self._send_bad_attempts('test', FLAGS.lockout_attempts)
+        self.assertTrue(self._is_locked_out('test'))
+
+    def test_timeout(self):
+        self._send_bad_attempts('test', FLAGS.lockout_attempts)
+        self.assertTrue(self._is_locked_out('test'))
+        utils.advance_time_seconds(FLAGS.lockout_minutes * 60)
+        self.assertFalse(self._is_locked_out('test'))
+
+    def test_multiple_keys(self):
+        self._send_bad_attempts('test1', FLAGS.lockout_attempts)
+        self.assertTrue(self._is_locked_out('test1'))
+        self.assertFalse(self._is_locked_out('test2'))
+        utils.advance_time_seconds(FLAGS.lockout_minutes * 60)
+        self.assertFalse(self._is_locked_out('test1'))
+        self.assertFalse(self._is_locked_out('test2'))
+
+    def test_window_timeout(self):
+        self._send_bad_attempts('test', FLAGS.lockout_attempts - 1)
+        self.assertFalse(self._is_locked_out('test'))
+        utils.advance_time_seconds(FLAGS.lockout_window * 60)
+        self._send_bad_attempts('test', FLAGS.lockout_attempts - 1)
+        self.assertFalse(self._is_locked_out('test'))

run_tests.py

@@ -60,6 +60,7 @@ from nova.tests.auth_unittest import *
 from nova.tests.cloud_unittest import *
 from nova.tests.compute_unittest import *
 from nova.tests.flags_unittest import *
+from nova.tests.middleware_unittest import *
 from nova.tests.misc_unittest import *
 from nova.tests.network_unittest import *
 #from nova.tests.objectstore_unittest import *