Redact tokens in request headers

Tokens shouldn't be logged since a token could be gathered from a
log file and used. The client was logging the X-Auth-Token and
X-Subject-Token request headers. With this change, the X-Auth-Token
and X-Subject-Token are shown as "TOKEN_REDACTED".

Also, the "Authentication" header is also redacted.

This is for security hardening.

SecurityImpact

Closes-Bug: #1004114
Closes-Bug: #1327019

Change-Id: I1edc3821ed028471102cc9b95eb9f3b54c9e2778

keystoneclient/session.py

@@ -139,6 +139,13 @@ class Session(object):
             # debug log.
             return
 
+        def process_header(header):
+            secure_headers = ('authorization', 'x-auth-token',
+                              'x-subject-token',)
+            if header[0].lower() in secure_headers:
+                return (header[0], 'TOKEN_REDACTED')
+            return header
+
         string_parts = ['REQ: curl -i']
 
         # NOTE(jamielennox): None means let requests do its default validation
@@ -153,7 +160,7 @@ class Session(object):
 
         if headers:
             for header in six.iteritems(headers):
-                string_parts.append('-H "%s: %s"' % header)
+                string_parts.append('-H "%s: %s"' % process_header(header))
         if json:
             data = jsonutils.dumps(json)
         if data:

keystoneclient/tests/test_session.py

@@ -11,6 +11,7 @@
 # under the License.
 
 import argparse
+import itertools
 import uuid
 
 import mock
@@ -139,10 +140,15 @@ class SessionTests(utils.TestCase):
     def test_session_debug_output(self):
         session = client_session.Session(verify=False)
         headers = {'HEADERA': 'HEADERVALB'}
+        security_headers = {'Authorization': uuid.uuid4().hex,
+                            'X-Auth-Token': uuid.uuid4().hex,
+                            'X-Subject-Token': uuid.uuid4().hex, }
         body = 'BODYRESPONSE'
         data = 'BODYDATA'
         self.stub_url('POST', text=body)
-        session.post(self.TEST_URL, headers=headers, data=data)
+        all_headers = dict(
+            itertools.chain(headers.items(), security_headers.items()))
+        session.post(self.TEST_URL, headers=all_headers, data=data)
 
         self.assertIn('curl', self.logger.output)
         self.assertIn('POST', self.logger.output)
@@ -153,6 +159,9 @@ class SessionTests(utils.TestCase):
         for k, v in six.iteritems(headers):
             self.assertIn(k, self.logger.output)
             self.assertIn(v, self.logger.output)
+        for k, v in six.iteritems(security_headers):
+            self.assertIn(k, self.logger.output)
+            self.assertNotIn(v, self.logger.output)
 
 
 class RedirectTests(utils.TestCase):