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# 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, Optional
import attr
from ._base import Config
@attr.s(frozen=True)
class SsoAttributeRequirement:
"""Object describing a single requirement for SSO attributes."""
attribute = attr.ib(type=str)
# If a value is not given, than the attribute must simply exist.
value = attr.ib(type=Optional[str])
JSON_SCHEMA = {
"type": "object",
"properties": {"attribute": {"type": "string"}, "value": {"type": "string"}},
"required": ["attribute", "value"],
}
class SSOConfig(Config):
"""SSO Configuration"""
section = "sso"
def read_config(self, config, **kwargs):
sso_config: Dict[str, Any] = config.get("sso") or {}
# The sso-specific template_dir
self.sso_template_dir = sso_config.get("template_dir")
# Read templates from disk
(
self.sso_login_idp_picker_template,
self.sso_redirect_confirm_template,
self.sso_auth_confirm_template,
self.sso_error_template,
sso_account_deactivated_template,
sso_auth_success_template,
self.sso_auth_bad_user_template,
) = self.read_templates(
[
"sso_login_idp_picker.html",
"sso_redirect_confirm.html",
"sso_auth_confirm.html",
"sso_error.html",
"sso_account_deactivated.html",
"sso_auth_success.html",
"sso_auth_bad_user.html",
],
self.sso_template_dir,
)
# These templates have no placeholders, so render them here
self.sso_account_deactivated_template = (
sso_account_deactivated_template.render()
)
self.sso_auth_success_template = sso_auth_success_template.render()
self.sso_client_whitelist = sso_config.get("client_whitelist") or []
self.sso_update_profile_information = (
sso_config.get("update_profile_information") or False
)
# 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 OpenID Connect,
# 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/
# Uncomment to keep a user's profile fields in sync with information from
# the identity provider. Currently only syncing the displayname is
# supported. Fields are checked on every SSO login, and are updated
# if necessary.
#
# Note that enabling this option will override user profile information,
# regardless of whether users have opted-out of syncing that
# information when first signing in. Defaults to false.
#
#update_profile_information: true
# Directory in which Synapse will try to find the template files below.
# If not set, or the files named below are not found within the template
# directory, default templates from within the Synapse package will be used.
#
# Synapse will look for the following templates in this directory:
#
# * HTML page to prompt the user to choose an Identity Provider during
# login: 'sso_login_idp_picker.html'.
#
# This is only used if multiple SSO Identity Providers are configured.
#
# When rendering, this template is given the following variables:
# * redirect_url: the URL that the user will be redirected to after
# login.
#
# * server_name: the homeserver's name.
#
# * providers: a list of available Identity Providers. Each element is
# an object with the following attributes:
#
# * idp_id: unique identifier for the IdP
# * idp_name: user-facing name for the IdP
# * idp_icon: if specified in the IdP config, an MXC URI for an icon
# for the IdP
# * idp_brand: if specified in the IdP config, a textual identifier
# for the brand of the IdP
#
# The rendered HTML page should contain a form which submits its results
# back as a GET request, with the following query parameters:
#
# * redirectUrl: the client redirect URI (ie, the `redirect_url` passed
# to the template)
#
# * idp: the 'idp_id' of the chosen IDP.
#
# * HTML page to prompt new users to enter a userid and confirm other
# details: 'sso_auth_account_details.html'. This is only shown if the
# SSO implementation (with any user_mapping_provider) does not return
# a localpart.
#
# When rendering, this template is given the following variables:
#
# * server_name: the homeserver's name.
#
# * idp: details of the SSO Identity Provider that the user logged in
# with: an object with the following attributes:
#
# * idp_id: unique identifier for the IdP
# * idp_name: user-facing name for the IdP
# * idp_icon: if specified in the IdP config, an MXC URI for an icon
# for the IdP
# * idp_brand: if specified in the IdP config, a textual identifier
# for the brand of the IdP
#
# * user_attributes: an object containing details about the user that
# we received from the IdP. May have the following attributes:
#
# * display_name: the user's display_name
# * emails: a list of email addresses
#
# The template should render a form which submits the following fields:
#
# * username: the localpart of the user's chosen user id
#
# * HTML page allowing the user to consent to the server's terms and
# conditions. This is only shown for new users, and only if
# `user_consent.require_at_registration` is set.
#
# When rendering, this template is given the following variables:
#
# * server_name: the homeserver's name.
#
# * user_id: the user's matrix proposed ID.
#
# * user_profile.display_name: the user's proposed display name, if any.
#
# * consent_version: the version of the terms that the user will be
# shown
#
# * terms_url: a link to the page showing the terms.
#
# The template should render a form which submits the following fields:
#
# * accepted_version: the version of the terms accepted by the user
# (ie, 'consent_version' from the input variables).
#
# * 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 the following variables:
#
# * redirect_url: the URL the user is about to be redirected to.
#
# * 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.
#
# * server_name: the homeserver's name.
#
# * new_user: a boolean indicating whether this is the user's first time
# logging in.
#
# * user_id: the user's matrix ID.
#
# * user_profile.avatar_url: an MXC URI for the user's avatar, if any.
# None if the user has not set an avatar.
#
# * user_profile.display_name: the user's display name. None if the user
# has not set a display name.
#
# * HTML page which notifies the user that they are authenticating to confirm
# an operation on their account during the user interactive authentication
# process: 'sso_auth_confirm.html'.
#
# When rendering, this template is given the following variables:
# * redirect_url: the URL the user is about to be redirected to.
#
# * description: the operation which the user is being asked to confirm
#
# * idp: details of the Identity Provider that we will use to confirm
# the user's identity: an object with the following attributes:
#
# * idp_id: unique identifier for the IdP
# * idp_name: user-facing name for the IdP
# * idp_icon: if specified in the IdP config, an MXC URI for an icon
# for the IdP
# * idp_brand: if specified in the IdP config, a textual identifier
# for the brand of the IdP
#
# * HTML page shown after a successful user interactive authentication session:
# 'sso_auth_success.html'.
#
# Note that this page must include the JavaScript which notifies of a successful authentication
# (see https://matrix.org/docs/spec/client_server/r0.6.0#fallback).
#
# This template has no additional variables.
#
# * HTML page shown after a user-interactive authentication session which
# does not map correctly onto the expected user: 'sso_auth_bad_user.html'.
#
# When rendering, this template is given the following variables:
# * server_name: the homeserver's name.
# * user_id_to_verify: the MXID of the user that we are trying to
# validate.
#
# * HTML page shown during single sign-on if a deactivated user (according to Synapse's database)
# attempts to login: 'sso_account_deactivated.html'.
#
# This template has no additional variables.
#
# * HTML page to display to users if something goes wrong during the
# OpenID Connect authentication process: 'sso_error.html'.
#
# When rendering, this template is given two variables:
# * error: the technical name of the error
# * error_description: a human-readable message for the error
#
# You can see the default templates at:
# https://github.com/matrix-org/synapse/tree/master/synapse/res/templates
#
#template_dir: "res/templates"
"""
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