forked-synapse/synapse/config/sso.py
Richard van der Hoff b7da598a61 Always whitelist the login fallback for SSO (#7153)
That fallback sets the redirect URL to itself (so it can process the login
token then return gracefully to the client). This would make it pointless to
ask the user for confirmation, since the URL the confirmation page would be
showing wouldn't be the client's.
2020-03-27 20:24:52 +00:00

108 lines
5.0 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2020 The Matrix.org Foundation C.I.C.
#
# 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 typing import Any, Dict
import pkg_resources
from ._base import Config
class SSOConfig(Config):
"""SSO Configuration
"""
section = "sso"
def read_config(self, config, **kwargs):
sso_config = config.get("sso") or {} # type: Dict[str, Any]
# Pick a template directory in order of:
# * The sso-specific template_dir
# * /path/to/synapse/install/res/templates
template_dir = sso_config.get("template_dir")
if not template_dir:
template_dir = pkg_resources.resource_filename("synapse", "res/templates",)
self.sso_redirect_confirm_template_dir = template_dir
self.sso_client_whitelist = sso_config.get("client_whitelist") or []
# Attempt to also whitelist the server's login fallback, since that fallback sets
# the redirect URL to itself (so it can process the login token then return
# gracefully to the client). This would make it pointless to ask the user for
# confirmation, since the URL the confirmation page would be showing wouldn't be
# the client's.
# public_baseurl is an optional setting, so we only add the fallback's URL to the
# list if it's provided (because we can't figure out what that URL is otherwise).
if self.public_baseurl:
login_fallback_url = self.public_baseurl + "_matrix/static/client/login"
self.sso_client_whitelist.append(login_fallback_url)
def generate_config_section(self, **kwargs):
return """\
# Additional settings to use with single-sign on systems such as SAML2 and CAS.
#
sso:
# A list of client URLs which are whitelisted so that the user does not
# have to confirm giving access to their account to the URL. Any client
# whose URL starts with an entry in the following list will not be subject
# to an additional confirmation step after the SSO login is completed.
#
# WARNING: An entry such as "https://my.client" is insecure, because it
# will also match "https://my.client.evil.site", exposing your users to
# phishing attacks from evil.site. To avoid this, include a slash after the
# hostname: "https://my.client/".
#
# If public_baseurl is set, then the login fallback page (used by clients
# that don't natively support the required login flows) is whitelisted in
# addition to any URLs in this list.
#
# By default, this list is empty.
#
#client_whitelist:
# - https://riot.im/develop
# - https://my.custom.client/
# Directory in which Synapse will try to find the template files below.
# If not set, default templates from within the Synapse package will be used.
#
# DO NOT UNCOMMENT THIS SETTING unless you want to customise the templates.
# If you *do* uncomment it, you will need to make sure that all the templates
# below are in the directory.
#
# Synapse will look for the following templates in this directory:
#
# * HTML page for a confirmation step before redirecting back to the client
# with the login token: 'sso_redirect_confirm.html'.
#
# When rendering, this template is given three variables:
# * redirect_url: the URL the user is about to be redirected to. Needs
# manual escaping (see
# https://jinja.palletsprojects.com/en/2.11.x/templates/#html-escaping).
#
# * display_url: the same as `redirect_url`, but with the query
# parameters stripped. The intention is to have a
# human-readable URL to show to users, not to use it as
# the final address to redirect to. Needs manual escaping
# (see https://jinja.palletsprojects.com/en/2.11.x/templates/#html-escaping).
#
# * server_name: the homeserver's name.
#
# You can see the default templates at:
# https://github.com/matrix-org/synapse/tree/master/synapse/res/templates
#
#template_dir: "res/templates"
"""