Integrate SAML2 basic authentication - uses pysaml2

synapse/config/homeserver.py

@@ -25,12 +25,12 @@ from .registration import RegistrationConfig
 from .metrics import MetricsConfig
 from .appservice import AppServiceConfig
 from .key import KeyConfig
-
+from .saml2 import SAML2Config
 
 class HomeServerConfig(TlsConfig, ServerConfig, DatabaseConfig, LoggingConfig,
                        RatelimitConfig, ContentRepositoryConfig, CaptchaConfig,
-                       VoipConfig, RegistrationConfig,
-                       MetricsConfig, AppServiceConfig, KeyConfig,):
+                       VoipConfig, RegistrationConfig, MetricsConfig,
+                       AppServiceConfig, KeyConfig, SAML2Config, ):
     pass
 
 

synapse/config/saml2.py

@@ -0,0 +1,27 @@
+# -*- coding: utf-8 -*-
+# Copyright 2015 Ericsson
+#
+# 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.
+
+from ._base import Config
+
+class SAML2Config(Config):
+    def read_config(self, config):
+        self.saml2_config = config["saml2_config"]
+
+    def default_config(self, config_dir_path, server_name):
+        return """
+        saml2_config:
+            config_path: "%s/sp_conf.py"
+            idp_redirect_url: "http://%s/idp"
+        """%(config_dir_path, server_name)

synapse/handlers/register.py

@@ -192,6 +192,36 @@ class RegistrationHandler(BaseHandler):
         else:
             logger.info("Valid captcha entered from %s", ip)
 
+    @defer.inlineCallbacks
+    def register_saml2(self, localpart):
+        """
+        Registers email_id as SAML2 Based Auth.
+        """
+        if urllib.quote(localpart) != localpart:
+            raise SynapseError(
+                400,
+                "User ID must only contain characters which do not"
+                " require URL encoding."
+                )
+        user = UserID(localpart, self.hs.hostname)
+        user_id = user.to_string()
+
+        yield self.check_user_id_is_valid(user_id)
+        token = self._generate_token(user_id)
+        try:
+            yield self.store.register(
+                user_id=user_id,
+                token=token,
+                password_hash=None
+            )
+            yield self.distributor.fire("registered_user", user)
+        except Exception, e:
+            yield self.store.add_access_token_to_user(user_id, token)
+            # Ignore Registration errors
+            logger.exception(e)
+        defer.returnValue((user_id, token))
+        
+
     @defer.inlineCallbacks
     def register_email(self, threepidCreds):
         """

synapse/python_dependencies.py

@@ -31,6 +31,7 @@ REQUIREMENTS = {
     "pillow": ["PIL"],
     "pydenticon": ["pydenticon"],
     "ujson": ["ujson"],
+    "pysaml2": ["saml2"],
 }
 CONDITIONAL_REQUIREMENTS = {
     "web_client": {

synapse/rest/client/v1/login.py

@@ -20,14 +20,32 @@ from synapse.types import UserID
 from base import ClientV1RestServlet, client_path_pattern
 
 import simplejson as json
+import cgi
+import urllib
+
+import logging
+from saml2 import BINDING_HTTP_REDIRECT
+from saml2 import BINDING_HTTP_POST
+from saml2.metadata import create_metadata_string
+from saml2 import config
+from saml2.client import Saml2Client
+from saml2.httputil import ServiceError
+from saml2.samlp import Extensions
+from saml2.extension.pefim import SPCertEnc
+from saml2.s_utils import rndstr
 
 
 class LoginRestServlet(ClientV1RestServlet):
     PATTERN = client_path_pattern("/login$")
     PASS_TYPE = "m.login.password"
+    SAML2_TYPE = "m.login.saml2"
+
+    def __init__(self, hs):
+        super(LoginRestServlet, self).__init__(hs)
+        self.idp_redirect_url = hs.config.saml2_config['idp_redirect_url']
 
     def on_GET(self, request):
-        return (200, {"flows": [{"type": LoginRestServlet.PASS_TYPE}]})
+        return (200, {"flows": [{"type": LoginRestServlet.PASS_TYPE}, {"type": LoginRestServlet.SAML2_TYPE}]})
 
     def on_OPTIONS(self, request):
         return (200, {})
@@ -39,6 +57,14 @@ class LoginRestServlet(ClientV1RestServlet):
             if login_submission["type"] == LoginRestServlet.PASS_TYPE:
                 result = yield self.do_password_login(login_submission)
                 defer.returnValue(result)
+            elif login_submission["type"] == LoginRestServlet.SAML2_TYPE:
+                relay_state = ""
+                if "relay_state" in login_submission:
+                    relay_state = "&RelayState="+urllib.quote(login_submission["relay_state"])
+                result = {
+                    "uri": "%s%s"%(self.idp_redirect_url, relay_state)
+                }
+                defer.returnValue((200, result))
             else:
                 raise SynapseError(400, "Bad login type.")
         except KeyError:
@@ -93,6 +119,39 @@ class PasswordResetRestServlet(ClientV1RestServlet):
                 "Missing keys. Requires 'email' and 'user_id'."
             )
 
+class SAML2RestServlet(ClientV1RestServlet):
+    PATTERN = client_path_pattern("/login/saml2")
+
+    def __init__(self, hs):
+        super(SAML2RestServlet, self).__init__(hs)
+        self.sp_config = hs.config.saml2_config['config_path']
+
+    @defer.inlineCallbacks
+    def on_POST(self, request):
+        saml2_auth = None
+        try:
+            conf = config.SPConfig()
+            conf.load_file(self.sp_config)
+            SP = Saml2Client(conf)
+            saml2_auth = SP.parse_authn_request_response(request.args['SAMLResponse'][0], BINDING_HTTP_POST)
+        except Exception, e: # Not authenticated
+            logger = logging.getLogger(__name__)
+            logger.exception(e)
+        if  saml2_auth and saml2_auth.status_ok() and not saml2_auth.not_signed:
+            username = saml2_auth.name_id.text
+            handler = self.handlers.registration_handler
+            (user_id, token) = yield handler.register_saml2(username)
+            # Forward to the RelayState callback along with ava
+            if 'RelayState' in request.args:
+                request.redirect(urllib.unquote(request.args['RelayState'][0])+'?status=authenticated&access_token='+token+'&user_id='+user_id+'&ava='+urllib.quote(json.dumps(saml2_auth.ava)))
+                request.finish()
+                defer.returnValue(None)
+            defer.returnValue((200, {"status":"authenticated", "user_id": user_id, "token": token, "ava":saml2_auth.ava}))
+        elif 'RelayState' in request.args:
+            request.redirect(urllib.unquote(request.args['RelayState'][0])+'?status=not_authenticated')
+            request.finish()
+            defer.returnValue(None)
+        defer.returnValue((200, {"status":"not_authenticated"}))
 
 def _parse_json(request):
     try:
@@ -106,4 +165,5 @@ def _parse_json(request):
 
 def register_servlets(hs, http_server):
     LoginRestServlet(hs).register(http_server)
+    SAML2RestServlet(hs).register(http_server)
     # TODO PasswordResetRestServlet(hs).register(http_server)