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# -*- coding: utf-8 -*-
# Copyright 2015, 2016 OpenMarket Ltd
#
# 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.
import logging
from synapse.api.constants import LoginType
from synapse.api.errors import SynapseError
from synapse.api.urls import CLIENT_API_PREFIX
from synapse.http.server import respond_with_html
from synapse.http.servlet import RestServlet, parse_string
from ._base import client_patterns
logger = logging.getLogger(__name__)
class AuthRestServlet(RestServlet):
"""
Handles Client / Server API authentication in any situations where it
cannot be handled in the normal flow (with requests to the same endpoint).
Current use is for web fallback auth.
"""
PATTERNS = client_patterns(r"/auth/(?P<stagetype>[\w\.]*)/fallback/web")
def __init__(self, hs):
super().__init__()
self.hs = hs
self.auth = hs.get_auth()
self.auth_handler = hs.get_auth_handler()
self.registration_handler = hs.get_registration_handler()
# SSO configuration.
self._cas_enabled = hs.config.cas_enabled
if self._cas_enabled:
self._cas_handler = hs.get_cas_handler()
self._cas_server_url = hs.config.cas_server_url
self._cas_service_url = hs.config.cas_service_url
self._saml_enabled = hs.config.saml2_enabled
if self._saml_enabled:
self._saml_handler = hs.get_saml_handler()
self._oidc_enabled = hs.config.oidc_enabled
if self._oidc_enabled:
self._oidc_handler = hs.get_oidc_handler()
self._cas_server_url = hs.config.cas_server_url
self._cas_service_url = hs.config.cas_service_url
self.recaptcha_template = hs.config.recaptcha_template
self.terms_template = hs.config.terms_template
self.success_template = hs.config.fallback_success_template
async def on_GET(self, request, stagetype):
session = parse_string(request, "session")
if not session:
raise SynapseError(400, "No session supplied")
if stagetype == LoginType.RECAPTCHA:
html = self.recaptcha_template.render(
session=session,
myurl="%s/r0/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.RECAPTCHA),
sitekey=self.hs.config.recaptcha_public_key,
)
elif stagetype == LoginType.TERMS:
html = self.terms_template.render(
session=session,
terms_url="%s_matrix/consent?v=%s"
% (self.hs.config.public_baseurl, self.hs.config.user_consent_version),
myurl="%s/r0/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.TERMS),
)
elif stagetype == LoginType.SSO:
# Display a confirmation page which prompts the user to
# re-authenticate with their SSO provider.
if self._cas_enabled:
# Generate a request to CAS that redirects back to an endpoint
# to verify the successful authentication.
sso_redirect_url = self._cas_handler.get_redirect_url(
{"session": session},
)
elif self._saml_enabled:
# Some SAML identity providers (e.g. Google) require a
# RelayState parameter on requests. It is not necessary here, so
# pass in a dummy redirect URL (which will never get used).
client_redirect_url = b"unused"
sso_redirect_url = self._saml_handler.handle_redirect_request(
client_redirect_url, session
)
elif self._oidc_enabled:
client_redirect_url = b""
sso_redirect_url = await self._oidc_handler.handle_redirect_request(
request, client_redirect_url, session
)
else:
raise SynapseError(400, "Homeserver not configured for SSO.")
html = await self.auth_handler.start_sso_ui_auth(sso_redirect_url, session)
else:
raise SynapseError(404, "Unknown auth stage type")
# Render the HTML and return.
respond_with_html(request, 200, html)
return None
async def on_POST(self, request, stagetype):
session = parse_string(request, "session")
if not session:
raise SynapseError(400, "No session supplied")
if stagetype == LoginType.RECAPTCHA:
response = parse_string(request, "g-recaptcha-response")
if not response:
raise SynapseError(400, "No captcha response supplied")
authdict = {"response": response, "session": session}
success = await self.auth_handler.add_oob_auth(
LoginType.RECAPTCHA, authdict, self.hs.get_ip_from_request(request)
)
if success:
html = self.success_template.render()
else:
html = self.recaptcha_template.render(
session=session,
myurl="%s/r0/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.RECAPTCHA),
sitekey=self.hs.config.recaptcha_public_key,
)
elif stagetype == LoginType.TERMS:
authdict = {"session": session}
success = await self.auth_handler.add_oob_auth(
LoginType.TERMS, authdict, self.hs.get_ip_from_request(request)
)
if success:
html = self.success_template.render()
else:
html = self.terms_template.render(
session=session,
terms_url="%s_matrix/consent?v=%s"
% (
self.hs.config.public_baseurl,
self.hs.config.user_consent_version,
),
myurl="%s/r0/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.TERMS),
)
elif stagetype == LoginType.SSO:
# The SSO fallback workflow should not post here,
raise SynapseError(404, "Fallback SSO auth does not support POST requests.")
else:
raise SynapseError(404, "Unknown auth stage type")
# Render the HTML and return.
respond_with_html(request, 200, html)
return None
def on_OPTIONS(self, _):
return 200, {}
def register_servlets(hs, http_server):
AuthRestServlet(hs).register(http_server)
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