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Rip out half-implemented m.login.saml2 support (#4265)

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* Rip out half-implemented m.login.saml2 support

This was implemented in an odd way that left most of the work to the client, in
a way that I really didn't understand. It's going to be a pain to maintain, so
let's start by ripping it out.

* drop undocumented dependency on dateutil

It turns out we were relying on dateutil being pulled in transitively by
pysaml2. There's no need for that bloat.
This commit is contained in:
Richard van der Hoff 2018-12-06 09:44:38 +01:00 committed by Amber Brown
parent 9a3e24a13d
commit b0c24a66ec
7 changed files with 4 additions and 169 deletions
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1
changelog.d/4265.feature Normal file
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@ -0,0 +1 @@
Rework SAML2 authentication

3
synapse/config/homeserver.py
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@ -32,7 +32,6 @@ from .ratelimiting import RatelimitConfig
from .registration import RegistrationConfig
from .repository import ContentRepositoryConfig
from .room_directory import RoomDirectoryConfig
from .saml2 import SAML2Config
from .server import ServerConfig
from .server_notices_config import ServerNoticesConfig
from .spam_checker import SpamCheckerConfig
@ -45,7 +44,7 @@ from .workers import WorkerConfig
class HomeServerConfig(TlsConfig, ServerConfig, DatabaseConfig, LoggingConfig,
RatelimitConfig, ContentRepositoryConfig, CaptchaConfig,
VoipConfig, RegistrationConfig, MetricsConfig, ApiConfig,
AppServiceConfig, KeyConfig, SAML2Config, CasConfig,
AppServiceConfig, KeyConfig, CasConfig,
JWTConfig, PasswordConfig, EmailConfig,
WorkerConfig, PasswordAuthProviderConfig, PushConfig,
SpamCheckerConfig, GroupsConfig, UserDirectoryConfig,

55
synapse/config/saml2.py
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@ -1,55 +0,0 @@
# -*- 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):
"""SAML2 Configuration
Synapse uses pysaml2 libraries for providing SAML2 support
config_path: Path to the sp_conf.py configuration file
idp_redirect_url: Identity provider URL which will redirect
the user back to /login/saml2 with proper info.
sp_conf.py file is something like:
https://github.com/rohe/pysaml2/blob/master/example/sp-repoze/sp_conf.py.example
More information: https://pythonhosted.org/pysaml2/howto/config.html
"""
def read_config(self, config):
saml2_config = config.get("saml2_config", None)
if saml2_config:
self.saml2_enabled = saml2_config.get("enabled", True)
self.saml2_config_path = saml2_config["config_path"]
self.saml2_idp_redirect_url = saml2_config["idp_redirect_url"]
else:
self.saml2_enabled = False
self.saml2_config_path = None
self.saml2_idp_redirect_url = None
def default_config(self, config_dir_path, server_name, **kwargs):
return """
# Enable SAML2 for registration and login. Uses pysaml2
# config_path: Path to the sp_conf.py configuration file
# idp_redirect_url: Identity provider URL which will redirect
# the user back to /login/saml2 with proper info.
# See pysaml2 docs for format of config.
#saml2_config:
# enabled: true
# config_path: "%s/sp_conf.py"
# idp_redirect_url: "http://%s/idp"
""" % (config_dir_path, server_name)

29
synapse/handlers/register.py
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@ -327,35 +327,6 @@ 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 types.contains_invalid_mxid_characters(localpart):
raise SynapseError(
400,
"User ID can only contain characters a-z, 0-9, or '=_-./'",
)
yield self.auth.check_auth_blocking()
user = UserID(localpart, self.hs.hostname)
user_id = user.to_string()
yield self.check_user_id_not_appservice_exclusive(user_id)
token = self.macaroon_gen.generate_access_token(user_id)
try:
yield self.store.register(
user_id=user_id,
token=token,
password_hash=None,
create_profile_with_localpart=user.localpart,
)
except Exception as 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):
"""

1
synapse/python_dependencies.py
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@ -53,7 +53,6 @@ REQUIREMENTS = {
"pillow>=3.1.2": ["PIL"],
"sortedcontainers>=1.4.4": ["sortedcontainers"],
"psutil>=2.0.0": ["psutil>=2.0.0"],
"pysaml2>=3.0.0": ["saml2"],
"pymacaroons-pynacl>=0.9.3": ["pymacaroons"],
"msgpack-python>=0.4.2": ["msgpack"],
"phonenumbers>=8.2.0": ["phonenumbers"],

69
synapse/rest/client/v1/login.py
View File

@ -18,10 +18,6 @@ import xml.etree.ElementTree as ET
from six.moves import urllib
from canonicaljson import json
from saml2 import BINDING_HTTP_POST, config
from saml2.client import Saml2Client
from twisted.internet import defer
from twisted.web.client import PartialDownloadError
@ -81,7 +77,6 @@ def login_id_thirdparty_from_phone(identifier):
class LoginRestServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/login$")
SAML2_TYPE = "m.login.saml2"
CAS_TYPE = "m.login.cas"
SSO_TYPE = "m.login.sso"
TOKEN_TYPE = "m.login.token"
@ -89,8 +84,6 @@ class LoginRestServlet(ClientV1RestServlet):
def __init__(self, hs):
super(LoginRestServlet, self).__init__(hs)
self.idp_redirect_url = hs.config.saml2_idp_redirect_url
self.saml2_enabled = hs.config.saml2_enabled
self.jwt_enabled = hs.config.jwt_enabled
self.jwt_secret = hs.config.jwt_secret
self.jwt_algorithm = hs.config.jwt_algorithm
@ -103,8 +96,6 @@ class LoginRestServlet(ClientV1RestServlet):
flows = []
if self.jwt_enabled:
flows.append({"type": LoginRestServlet.JWT_TYPE})
if self.saml2_enabled:
flows.append({"type": LoginRestServlet.SAML2_TYPE})
if self.cas_enabled:
flows.append({"type": LoginRestServlet.SSO_TYPE})
@ -134,18 +125,8 @@ class LoginRestServlet(ClientV1RestServlet):
def on_POST(self, request):
login_submission = parse_json_object_from_request(request)
try:
if self.saml2_enabled and (login_submission["type"] ==
LoginRestServlet.SAML2_TYPE):
relay_state = ""
if "relay_state" in login_submission:
relay_state = "&RelayState=" + urllib.parse.quote(
login_submission["relay_state"])
result = {
"uri": "%s%s" % (self.idp_redirect_url, relay_state)
}
defer.returnValue((200, result))
elif self.jwt_enabled and (login_submission["type"] ==
LoginRestServlet.JWT_TYPE):
if self.jwt_enabled and (login_submission["type"] ==
LoginRestServlet.JWT_TYPE):
result = yield self.do_jwt_login(login_submission)
defer.returnValue(result)
elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE:
@ -345,50 +326,6 @@ class LoginRestServlet(ClientV1RestServlet):
)
class SAML2RestServlet(ClientV1RestServlet):
PATTERNS = client_path_patterns("/login/saml2", releases=())
def __init__(self, hs):
super(SAML2RestServlet, self).__init__(hs)
self.sp_config = hs.config.saml2_config_path
self.handlers = hs.get_handlers()
@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 as e: # Not authenticated
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.parse.unquote(
request.args['RelayState'][0]) +
'?status=authenticated&access_token=' +
token + '&user_id=' + user_id + '&ava=' +
urllib.quote(json.dumps(saml2_auth.ava)))
finish_request(request)
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.parse.unquote(
request.args['RelayState'][0]) +
'?status=not_authenticated')
finish_request(request)
defer.returnValue(None)
defer.returnValue((200, {"status": "not_authenticated"}))
class CasRedirectServlet(RestServlet):
PATTERNS = client_path_patterns("/login/(cas|sso)/redirect")
@ -517,8 +454,6 @@ class CasTicketServlet(ClientV1RestServlet):
def register_servlets(hs, http_server):
LoginRestServlet(hs).register(http_server)
if hs.config.saml2_enabled:
SAML2RestServlet(hs).register(http_server)
if hs.config.cas_enabled:
CasRedirectServlet(hs).register(http_server)
CasTicketServlet(hs).register(http_server)

15
tests/handlers/test_register.py
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@ -129,21 +129,6 @@ class RegistrationTestCase(unittest.TestCase):
with self.assertRaises(ResourceLimitError):
yield self.handler.register(localpart="local_part")
@defer.inlineCallbacks
def test_register_saml2_mau_blocked(self):
self.hs.config.limit_usage_by_mau = True
self.store.get_monthly_active_count = Mock(
return_value=defer.succeed(self.lots_of_users)
)
with self.assertRaises(ResourceLimitError):
yield self.handler.register_saml2(localpart="local_part")
self.store.get_monthly_active_count = Mock(
return_value=defer.succeed(self.hs.config.max_mau_value)
)
with self.assertRaises(ResourceLimitError):
yield self.handler.register_saml2(localpart="local_part")
@defer.inlineCallbacks
def test_auto_create_auto_join_rooms(self):
room_alias_str = "#room:test"