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UI Auth via SSO: redirect the user to an appropriate SSO. (#9081)

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If we have integrations with multiple identity providers, when the user does a UI Auth, we need to redirect them to the right one.

There are a few steps to this. First of all we actually need to store the userid of the user we are trying to validate in the UIA session, since the /auth/sso/fallback/web request is unauthenticated.

Then, once we get the /auth/sso/fallback/web request, we can fish the user id out of the session, and use it to look up the external id mappings, and hence pick an SSO provider for them.
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Richard van der Hoff 2021-01-12 17:38:03 +00:00 • committed by GitHub
parent 723b19748a
commit 789d9ebad3
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7 changed files with 133 additions and 60 deletions
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33
synapse/rest/client/v2_alpha/auth.py
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@ -19,7 +19,6 @@ from typing import TYPE_CHECKING
from synapse.api.constants import LoginType
from synapse.api.errors import SynapseError
from synapse.api.urls import CLIENT_API_PREFIX
from synapse.handlers.sso import SsoIdentityProvider
from synapse.http.server import respond_with_html
from synapse.http.servlet import RestServlet, parse_string
@ -46,22 +45,6 @@ class AuthRestServlet(RestServlet):
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
@ -90,21 +73,7 @@ class AuthRestServlet(RestServlet):
elif stagetype == LoginType.SSO:
# Display a confirmation page which prompts the user to
# re-authenticate with their SSO provider.
if self._cas_enabled:
sso_auth_provider = self._cas_handler # type: SsoIdentityProvider
elif self._saml_enabled:
sso_auth_provider = self._saml_handler
elif self._oidc_enabled:
sso_auth_provider = self._oidc_handler
else:
raise SynapseError(400, "Homeserver not configured for SSO.")
sso_redirect_url = await sso_auth_provider.handle_redirect_request(
request, None, session
)
html = await self.auth_handler.start_sso_ui_auth(sso_redirect_url, session)
html = await self.auth_handler.start_sso_ui_auth(request, session)
else:
raise SynapseError(404, "Unknown auth stage type")