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Store an IdP ID in the OIDC session (#9109)
Again in preparation for handling more than one OIDC provider, add a new caveat to the macaroon used as an OIDC session cookie, which remembers which OIDC provider we are talking to. In future, when we get a callback, we'll need it to make sure we talk to the right IdP. As part of this, I'm adding an idp_id and idp_name field to the OIDC configuration object. They aren't yet documented, and we'll just use the old values by default.
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4 changed files with 42 additions and 10 deletions
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changelog.d/9109.feature
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changelog.d/9109.feature
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Add support for multiple SSO Identity Providers.
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@ -1,6 +1,6 @@
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# -*- coding: utf-8 -*-
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# Copyright 2020 Quentin Gliech
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# Copyright 2020 The Matrix.org Foundation C.I.C.
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# Copyright 2020-2021 The Matrix.org Foundation C.I.C.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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@ -14,6 +14,7 @@
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# See the License for the specific language governing permissions and
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# limitations under the License.
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import string
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from typing import Optional, Type
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import attr
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@ -38,7 +39,7 @@ class OIDCConfig(Config):
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oidc_config = config.get("oidc_config")
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if oidc_config and oidc_config.get("enabled", False):
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validate_config(OIDC_PROVIDER_CONFIG_SCHEMA, oidc_config, "oidc_config")
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validate_config(OIDC_PROVIDER_CONFIG_SCHEMA, oidc_config, ("oidc_config",))
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self.oidc_provider = _parse_oidc_config_dict(oidc_config)
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if not self.oidc_provider:
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@ -205,6 +206,8 @@ OIDC_PROVIDER_CONFIG_SCHEMA = {
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"type": "object",
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"required": ["issuer", "client_id", "client_secret"],
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"properties": {
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"idp_id": {"type": "string", "minLength": 1, "maxLength": 128},
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"idp_name": {"type": "string"},
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"discover": {"type": "boolean"},
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"issuer": {"type": "string"},
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"client_id": {"type": "string"},
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@ -277,7 +280,17 @@ def _parse_oidc_config_dict(oidc_config: JsonDict) -> "OidcProviderConfig":
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"methods: %s" % (", ".join(missing_methods),)
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)
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# MSC2858 will appy certain limits in what can be used as an IdP id, so let's
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# enforce those limits now.
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idp_id = oidc_config.get("idp_id", "oidc")
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valid_idp_chars = set(string.ascii_letters + string.digits + "-._~")
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if any(c not in valid_idp_chars for c in idp_id):
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raise ConfigError('idp_id may only contain A-Z, a-z, 0-9, "-", ".", "_", "~"')
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return OidcProviderConfig(
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idp_id=idp_id,
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idp_name=oidc_config.get("idp_name", "OIDC"),
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discover=oidc_config.get("discover", True),
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issuer=oidc_config["issuer"],
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client_id=oidc_config["client_id"],
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@ -296,8 +309,15 @@ def _parse_oidc_config_dict(oidc_config: JsonDict) -> "OidcProviderConfig":
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)
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@attr.s
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@attr.s(slots=True, frozen=True)
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class OidcProviderConfig:
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# a unique identifier for this identity provider. Used in the 'user_external_ids'
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# table, as well as the query/path parameter used in the login protocol.
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idp_id = attr.ib(type=str)
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# user-facing name for this identity provider.
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idp_name = attr.ib(type=str)
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# whether the OIDC discovery mechanism is used to discover endpoints
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discover = attr.ib(type=bool)
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@ -175,7 +175,7 @@ class OidcHandler:
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session_data = self._token_generator.verify_oidc_session_token(
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session, state
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)
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except MacaroonDeserializationException as e:
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except (MacaroonDeserializationException, ValueError) as e:
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logger.exception("Invalid session")
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self._sso_handler.render_error(request, "invalid_session", str(e))
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return
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@ -253,10 +253,10 @@ class OidcProvider:
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self._server_name = hs.config.server_name # type: str
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# identifier for the external_ids table
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self.idp_id = "oidc"
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self.idp_id = provider.idp_id
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# user-facing name of this auth provider
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self.idp_name = "OIDC"
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self.idp_name = provider.idp_name
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self._sso_handler = hs.get_sso_handler()
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@ -656,6 +656,7 @@ class OidcProvider:
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cookie = self._token_generator.generate_oidc_session_token(
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state=state,
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session_data=OidcSessionData(
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idp_id=self.idp_id,
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nonce=nonce,
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client_redirect_url=client_redirect_url.decode(),
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ui_auth_session_id=ui_auth_session_id,
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@ -924,6 +925,7 @@ class OidcSessionTokenGenerator:
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macaroon.add_first_party_caveat("gen = 1")
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macaroon.add_first_party_caveat("type = session")
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macaroon.add_first_party_caveat("state = %s" % (state,))
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macaroon.add_first_party_caveat("idp_id = %s" % (session_data.idp_id,))
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macaroon.add_first_party_caveat("nonce = %s" % (session_data.nonce,))
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macaroon.add_first_party_caveat(
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"client_redirect_url = %s" % (session_data.client_redirect_url,)
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@ -952,6 +954,9 @@ class OidcSessionTokenGenerator:
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Returns:
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The data extracted from the session cookie
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Raises:
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ValueError if an expected caveat is missing from the macaroon.
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"""
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macaroon = pymacaroons.Macaroon.deserialize(session)
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@ -960,6 +965,7 @@ class OidcSessionTokenGenerator:
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v.satisfy_exact("type = session")
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v.satisfy_exact("state = %s" % (state,))
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v.satisfy_general(lambda c: c.startswith("nonce = "))
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v.satisfy_general(lambda c: c.startswith("idp_id = "))
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v.satisfy_general(lambda c: c.startswith("client_redirect_url = "))
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# Sometimes there's a UI auth session ID, it seems to be OK to attempt
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# to always satisfy this.
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@ -968,9 +974,9 @@ class OidcSessionTokenGenerator:
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v.verify(macaroon, self._macaroon_secret_key)
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# Extract the `nonce`, `client_redirect_url`, and maybe the
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# `ui_auth_session_id` from the token.
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# Extract the session data from the token.
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nonce = self._get_value_from_macaroon(macaroon, "nonce")
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idp_id = self._get_value_from_macaroon(macaroon, "idp_id")
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client_redirect_url = self._get_value_from_macaroon(
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macaroon, "client_redirect_url"
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)
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@ -983,6 +989,7 @@ class OidcSessionTokenGenerator:
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return OidcSessionData(
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nonce=nonce,
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idp_id=idp_id,
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client_redirect_url=client_redirect_url,
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ui_auth_session_id=ui_auth_session_id,
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)
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@ -998,7 +1005,7 @@ class OidcSessionTokenGenerator:
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The extracted value
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Raises:
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Exception: if the caveat was not in the macaroon
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ValueError: if the caveat was not in the macaroon
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"""
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prefix = key + " = "
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for caveat in macaroon.caveats:
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@ -1019,6 +1026,9 @@ class OidcSessionTokenGenerator:
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class OidcSessionData:
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"""The attributes which are stored in a OIDC session cookie"""
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# the Identity Provider being used
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idp_id = attr.ib(type=str)
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# The `nonce` parameter passed to the OIDC provider.
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nonce = attr.ib(type=str)
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@ -848,6 +848,7 @@ class OidcHandlerTestCase(HomeserverTestCase):
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return self.handler._token_generator.generate_oidc_session_token(
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state=state,
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session_data=OidcSessionData(
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idp_id="oidc",
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nonce=nonce,
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client_redirect_url=client_redirect_url,
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ui_auth_session_id=ui_auth_session_id,
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@ -990,7 +991,7 @@ async def _make_callback_with_userinfo(
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session = handler._token_generator.generate_oidc_session_token(
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state=state,
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session_data=OidcSessionData(
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nonce="nonce", client_redirect_url=client_redirect_url,
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idp_id="oidc", nonce="nonce", client_redirect_url=client_redirect_url,
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),
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)
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request = _build_callback_request("code", state, session)
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