diff options
| -rw-r--r-- | changelog.d/15388.feature | 1 | ||||
| -rw-r--r-- | docs/usage/configuration/config_documentation.md | 65 | ||||
| -rw-r--r-- | synapse/config/auth.py | 10 | ||||
| -rw-r--r-- | synapse/config/experimental.py | 13 | ||||
| -rw-r--r-- | synapse/rest/client/capabilities.py | 3 | ||||
| -rw-r--r-- | synapse/rest/client/login.py | 31 | ||||
| -rw-r--r-- | synapse/rest/client/login_token_request.py | 47 | ||||
| -rw-r--r-- | synapse/rest/client/versions.py | 4 | ||||
| -rw-r--r-- | tests/config/test_oauth_delegation.py | 4 | ||||
| -rw-r--r-- | tests/rest/client/test_capabilities.py | 28 | ||||
| -rw-r--r-- | tests/rest/client/test_login.py | 23 | ||||
| -rw-r--r-- | tests/rest/client/test_login_token_request.py | 71 |
12 files changed, 225 insertions, 75 deletions
diff --git a/changelog.d/15388.feature b/changelog.d/15388.feature new file mode 100644 index 0000000000..6cc55cafa2 --- /dev/null +++ b/changelog.d/15388.feature @@ -0,0 +1 @@ +Stable support for [MSC3882](https://github.com/matrix-org/matrix-spec-proposals/pull/3882) to allow an existing device/session to generate a login token for use on a new device/session. \ No newline at end of file diff --git a/docs/usage/configuration/config_documentation.md b/docs/usage/configuration/config_documentation.md index 5ede6d0a82..0cf6e075ff 100644 --- a/docs/usage/configuration/config_documentation.md +++ b/docs/usage/configuration/config_documentation.md @@ -2570,7 +2570,50 @@ Example configuration: ```yaml nonrefreshable_access_token_lifetime: 24h ``` +--- +### `ui_auth` + +The amount of time to allow a user-interactive authentication session to be active. +This defaults to 0, meaning the user is queried for their credentials +before every action, but this can be overridden to allow a single +validation to be re-used. This weakens the protections afforded by +the user-interactive authentication process, by allowing for multiple +(and potentially different) operations to use the same validation session. + +This is ignored for potentially "dangerous" operations (including +deactivating an account, modifying an account password, adding a 3PID, +and minting additional login tokens). + +Use the `session_timeout` sub-option here to change the time allowed for credential validation. + +Example configuration: +```yaml +ui_auth: + session_timeout: "15s" +``` +--- +### `login_via_existing_session` + +Matrix supports the ability of an existing session to mint a login token for +another client. + +Synapse disables this by default as it has security ramifications -- a malicious +client could use the mechanism to spawn more than one session. + +The duration of time the generated token is valid for can be configured with the +`token_timeout` sub-option. + +User-interactive authentication is required when this is enabled unless the +`require_ui_auth` sub-option is set to `False`. + +Example configuration: +```yaml +login_via_existing_session: + enabled: true + require_ui_auth: false + token_timeout: "5m" +``` --- ## Metrics Config options related to metrics. @@ -3415,28 +3458,6 @@ password_config: require_uppercase: true ``` --- -### `ui_auth` - -The amount of time to allow a user-interactive authentication session to be active. - -This defaults to 0, meaning the user is queried for their credentials -before every action, but this can be overridden to allow a single -validation to be re-used. This weakens the protections afforded by -the user-interactive authentication process, by allowing for multiple -(and potentially different) operations to use the same validation session. - -This is ignored for potentially "dangerous" operations (including -deactivating an account, modifying an account password, and -adding a 3PID). - -Use the `session_timeout` sub-option here to change the time allowed for credential validation. - -Example configuration: -```yaml -ui_auth: - session_timeout: "15s" -``` ---- ## Push Configuration settings related to push notifications diff --git a/synapse/config/auth.py b/synapse/config/auth.py index 12e853980e..c7ab428f28 100644 --- a/synapse/config/auth.py +++ b/synapse/config/auth.py @@ -60,3 +60,13 @@ class AuthConfig(Config): self.ui_auth_session_timeout = self.parse_duration( ui_auth.get("session_timeout", 0) ) + + # Logging in with an existing session. + login_via_existing = config.get("login_via_existing_session", {}) + self.login_via_existing_enabled = login_via_existing.get("enabled", False) + self.login_via_existing_require_ui_auth = login_via_existing.get( + "require_ui_auth", True + ) + self.login_via_existing_token_timeout = self.parse_duration( + login_via_existing.get("token_timeout", "5m") + ) diff --git a/synapse/config/experimental.py b/synapse/config/experimental.py index 1d189b2e26..a9e002cf08 100644 --- a/synapse/config/experimental.py +++ b/synapse/config/experimental.py @@ -192,10 +192,10 @@ class MSC3861: ("captcha", "enable_registration_captcha"), ) - if root.experimental.msc3882_enabled: + if root.auth.login_via_existing_enabled: raise ConfigError( - "MSC3882 cannot be enabled when OAuth delegation is enabled", - ("experimental_features", "msc3882_enabled"), + "Login via existing session cannot be enabled when OAuth delegation is enabled", + ("login_via_existing_session", "enabled"), ) if root.registration.refresh_token_lifetime: @@ -319,13 +319,6 @@ class ExperimentalConfig(Config): # MSC3881: Remotely toggle push notifications for another client self.msc3881_enabled: bool = experimental.get("msc3881_enabled", False) - # MSC3882: Allow an existing session to sign in a new session - self.msc3882_enabled: bool = experimental.get("msc3882_enabled", False) - self.msc3882_ui_auth: bool = experimental.get("msc3882_ui_auth", True) - self.msc3882_token_timeout = self.parse_duration( - experimental.get("msc3882_token_timeout", "5m") - ) - # MSC3874: Filtering /messages with rel_types / not_rel_types. self.msc3874_enabled: bool = experimental.get("msc3874_enabled", False) diff --git a/synapse/rest/client/capabilities.py b/synapse/rest/client/capabilities.py index 0dbf8f6818..3154b9f77e 100644 --- a/synapse/rest/client/capabilities.py +++ b/synapse/rest/client/capabilities.py @@ -65,6 +65,9 @@ class CapabilitiesRestServlet(RestServlet): "m.3pid_changes": { "enabled": self.config.registration.enable_3pid_changes }, + "m.get_login_token": { + "enabled": self.config.auth.login_via_existing_enabled, + }, } } diff --git a/synapse/rest/client/login.py b/synapse/rest/client/login.py index d4dc2462b9..6493b00bb8 100644 --- a/synapse/rest/client/login.py +++ b/synapse/rest/client/login.py @@ -104,6 +104,9 @@ class LoginRestServlet(RestServlet): and hs.config.experimental.msc3866.require_approval_for_new_accounts ) + # Whether get login token is enabled. + self._get_login_token_enabled = hs.config.auth.login_via_existing_enabled + self.auth = hs.get_auth() self.clock = hs.get_clock() @@ -142,6 +145,9 @@ class LoginRestServlet(RestServlet): # to SSO. flows.append({"type": LoginRestServlet.CAS_TYPE}) + # The login token flow requires m.login.token to be advertised. + support_login_token_flow = self._get_login_token_enabled + if self.cas_enabled or self.saml2_enabled or self.oidc_enabled: flows.append( { @@ -153,14 +159,23 @@ class LoginRestServlet(RestServlet): } ) - # While it's valid for us to advertise this login type generally, - # synapse currently only gives out these tokens as part of the - # SSO login flow. - # Generally we don't want to advertise login flows that clients - # don't know how to implement, since they (currently) will always - # fall back to the fallback API if they don't understand one of the - # login flow types returned. - flows.append({"type": LoginRestServlet.TOKEN_TYPE}) + # SSO requires a login token to be generated, so we need to advertise that flow + support_login_token_flow = True + + # While it's valid for us to advertise this login type generally, + # synapse currently only gives out these tokens as part of the + # SSO login flow or as part of login via an existing session. + # + # Generally we don't want to advertise login flows that clients + # don't know how to implement, since they (currently) will always + # fall back to the fallback API if they don't understand one of the + # login flow types returned. + if support_login_token_flow: + tokenTypeFlow: Dict[str, Any] = {"type": LoginRestServlet.TOKEN_TYPE} + # If the login token flow is enabled advertise the get_login_token flag. + if self._get_login_token_enabled: + tokenTypeFlow["get_login_token"] = True + flows.append(tokenTypeFlow) flows.extend({"type": t} for t in self.auth_handler.get_supported_login_types()) diff --git a/synapse/rest/client/login_token_request.py b/synapse/rest/client/login_token_request.py index 43ea21d5e6..b1629f94a5 100644 --- a/synapse/rest/client/login_token_request.py +++ b/synapse/rest/client/login_token_request.py @@ -15,6 +15,7 @@ import logging from typing import TYPE_CHECKING, Tuple +from synapse.api.ratelimiting import Ratelimiter from synapse.http.server import HttpServer from synapse.http.servlet import RestServlet, parse_json_object_from_request from synapse.http.site import SynapseRequest @@ -33,7 +34,7 @@ class LoginTokenRequestServlet(RestServlet): Request: - POST /login/token HTTP/1.1 + POST /login/get_token HTTP/1.1 Content-Type: application/json {} @@ -43,30 +44,45 @@ class LoginTokenRequestServlet(RestServlet): HTTP/1.1 200 OK { "login_token": "ABDEFGH", - "expires_in": 3600, + "expires_in_ms": 3600000, } """ - PATTERNS = client_patterns( - "/org.matrix.msc3882/login/token$", releases=[], v1=False, unstable=True - ) + PATTERNS = [ + *client_patterns( + "/login/get_token$", releases=["v1"], v1=False, unstable=False + ), + # TODO: this is no longer needed once unstable MSC3882 does not need to be supported: + *client_patterns( + "/org.matrix.msc3882/login/token$", releases=[], v1=False, unstable=True + ), + ] def __init__(self, hs: "HomeServer"): super().__init__() self.auth = hs.get_auth() - self.store = hs.get_datastores().main - self.clock = hs.get_clock() - self.server_name = hs.config.server.server_name + self._main_store = hs.get_datastores().main self.auth_handler = hs.get_auth_handler() - self.token_timeout = hs.config.experimental.msc3882_token_timeout - self.ui_auth = hs.config.experimental.msc3882_ui_auth + self.token_timeout = hs.config.auth.login_via_existing_token_timeout + self._require_ui_auth = hs.config.auth.login_via_existing_require_ui_auth + + # Ratelimit aggressively to a maxmimum of 1 request per minute. + # + # This endpoint can be used to spawn additional sessions and could be + # abused by a malicious client to create many sessions. + self._ratelimiter = Ratelimiter( + store=self._main_store, + clock=hs.get_clock(), + rate_hz=1 / 60, + burst_count=1, + ) @interactive_auth_handler async def on_POST(self, request: SynapseRequest) -> Tuple[int, JsonDict]: requester = await self.auth.get_user_by_req(request) body = parse_json_object_from_request(request) - if self.ui_auth: + if self._require_ui_auth: await self.auth_handler.validate_user_via_ui_auth( requester, request, @@ -75,9 +91,12 @@ class LoginTokenRequestServlet(RestServlet): can_skip_ui_auth=False, # Don't allow skipping of UI auth ) + # Ensure that this endpoint isn't being used too often. (Ensure this is + # done *after* UI auth.) + await self._ratelimiter.ratelimit(None, requester.user.to_string().lower()) + login_token = await self.auth_handler.create_login_token_for_user_id( user_id=requester.user.to_string(), - auth_provider_id="org.matrix.msc3882.login_token_request", duration_ms=self.token_timeout, ) @@ -85,11 +104,13 @@ class LoginTokenRequestServlet(RestServlet): 200, { "login_token": login_token, + # TODO: this is no longer needed once unstable MSC3882 does not need to be supported: "expires_in": self.token_timeout // 1000, + "expires_in_ms": self.token_timeout, }, ) def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None: - if hs.config.experimental.msc3882_enabled: + if hs.config.auth.login_via_existing_enabled: LoginTokenRequestServlet(hs).register(http_server) diff --git a/synapse/rest/client/versions.py b/synapse/rest/client/versions.py index 32df054f56..547bf34df1 100644 --- a/synapse/rest/client/versions.py +++ b/synapse/rest/client/versions.py @@ -113,8 +113,8 @@ class VersionsRestServlet(RestServlet): "fi.mau.msc2815": self.config.experimental.msc2815_enabled, # Adds a ping endpoint for appservices to check HS->AS connection "fi.mau.msc2659.stable": True, # TODO: remove when "v1.7" is added above - # Adds support for login token requests as per MSC3882 - "org.matrix.msc3882": self.config.experimental.msc3882_enabled, + # TODO: this is no longer needed once unstable MSC3882 does not need to be supported: + "org.matrix.msc3882": self.config.auth.login_via_existing_enabled, # Adds support for remotely enabling/disabling pushers, as per MSC3881 "org.matrix.msc3881": self.config.experimental.msc3881_enabled, # Adds support for filtering /messages by event relation. diff --git a/tests/config/test_oauth_delegation.py b/tests/config/test_oauth_delegation.py index 2ead721b00..f57c813a58 100644 --- a/tests/config/test_oauth_delegation.py +++ b/tests/config/test_oauth_delegation.py @@ -228,8 +228,8 @@ class MSC3861OAuthDelegation(TestCase): with self.assertRaises(ConfigError): self.parse_config() - def test_msc3882_auth_cannot_be_enabled(self) -> None: - self.config_dict["experimental_features"]["msc3882_enabled"] = True + def test_login_via_existing_session_cannot_be_enabled(self) -> None: + self.config_dict["login_via_existing_session"] = {"enabled": True} with self.assertRaises(ConfigError): self.parse_config() diff --git a/tests/rest/client/test_capabilities.py b/tests/rest/client/test_capabilities.py index c16e8d43f4..cf23430f6a 100644 --- a/tests/rest/client/test_capabilities.py +++ b/tests/rest/client/test_capabilities.py @@ -186,3 +186,31 @@ class CapabilitiesTestCase(unittest.HomeserverTestCase): self.assertGreater(len(details["support"]), 0) for room_version in details["support"]: self.assertTrue(room_version in KNOWN_ROOM_VERSIONS, str(room_version)) + + def test_get_get_token_login_fields_when_disabled(self) -> None: + """By default login via an existing session is disabled.""" + access_token = self.get_success( + self.auth_handler.create_access_token_for_user_id( + self.user, device_id=None, valid_until_ms=None + ) + ) + + channel = self.make_request("GET", self.url, access_token=access_token) + capabilities = channel.json_body["capabilities"] + + self.assertEqual(channel.code, HTTPStatus.OK) + self.assertFalse(capabilities["m.get_login_token"]["enabled"]) + + @override_config({"login_via_existing_session": {"enabled": True}}) + def test_get_get_token_login_fields_when_enabled(self) -> None: + access_token = self.get_success( + self.auth_handler.create_access_token_for_user_id( + self.user, device_id=None, valid_until_ms=None + ) + ) + + channel = self.make_request("GET", self.url, access_token=access_token) + capabilities = channel.json_body["capabilities"] + + self.assertEqual(channel.code, HTTPStatus.OK) + self.assertTrue(capabilities["m.get_login_token"]["enabled"]) diff --git a/tests/rest/client/test_login.py b/tests/rest/client/test_login.py index dc32982e22..f3c3bc69a9 100644 --- a/tests/rest/client/test_login.py +++ b/tests/rest/client/test_login.py @@ -446,6 +446,29 @@ class LoginRestServletTestCase(unittest.HomeserverTestCase): ApprovalNoticeMedium.NONE, channel.json_body["approval_notice_medium"] ) + def test_get_login_flows_with_login_via_existing_disabled(self) -> None: + """GET /login should return m.login.token without get_login_token""" + channel = self.make_request("GET", "/_matrix/client/r0/login") + self.assertEqual(channel.code, 200, channel.result) + + flows = {flow["type"]: flow for flow in channel.json_body["flows"]} + self.assertNotIn("m.login.token", flows) + + @override_config({"login_via_existing_session": {"enabled": True}}) + def test_get_login_flows_with_login_via_existing_enabled(self) -> None: + """GET /login should return m.login.token with get_login_token true""" + channel = self.make_request("GET", "/_matrix/client/r0/login") + self.assertEqual(channel.code, 200, channel.result) + + self.assertCountEqual( + channel.json_body["flows"], + [ + {"type": "m.login.token", "get_login_token": True}, + {"type": "m.login.password"}, + {"type": "m.login.application_service"}, + ], + ) + @skip_unless(has_saml2 and HAS_OIDC, "Requires SAML2 and OIDC") class MultiSSOTestCase(unittest.HomeserverTestCase): diff --git a/tests/rest/client/test_login_token_request.py b/tests/rest/client/test_login_token_request.py index b8187db982..f05e619aa8 100644 --- a/tests/rest/client/test_login_token_request.py +++ b/tests/rest/client/test_login_token_request.py @@ -15,14 +15,14 @@ from twisted.test.proto_helpers import MemoryReactor from synapse.rest import admin -from synapse.rest.client import login, login_token_request +from synapse.rest.client import login, login_token_request, versions from synapse.server import HomeServer from synapse.util import Clock from tests import unittest from tests.unittest import override_config -endpoint = "/_matrix/client/unstable/org.matrix.msc3882/login/token" +GET_TOKEN_ENDPOINT = "/_matrix/client/v1/login/get_token" class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase): @@ -30,6 +30,7 @@ class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase): login.register_servlets, admin.register_servlets, login_token_request.register_servlets, + versions.register_servlets, # TODO: remove once unstable revision 0 support is removed ] def make_homeserver(self, reactor: MemoryReactor, clock: Clock) -> HomeServer: @@ -46,26 +47,26 @@ class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase): self.password = "password" def test_disabled(self) -> None: - channel = self.make_request("POST", endpoint, {}, access_token=None) + channel = self.make_request("POST", GET_TOKEN_ENDPOINT, {}, access_token=None) self.assertEqual(channel.code, 404) self.register_user(self.user, self.password) token = self.login(self.user, self.password) - channel = self.make_request("POST", endpoint, {}, access_token=token) + channel = self.make_request("POST", GET_TOKEN_ENDPOINT, {}, access_token=token) self.assertEqual(channel.code, 404) - @override_config({"experimental_features": {"msc3882_enabled": True}}) + @override_config({"login_via_existing_session": {"enabled": True}}) def test_require_auth(self) -> None: - channel = self.make_request("POST", endpoint, {}, access_token=None) + channel = self.make_request("POST", GET_TOKEN_ENDPOINT, {}, access_token=None) self.assertEqual(channel.code, 401) - @override_config({"experimental_features": {"msc3882_enabled": True}}) + @override_config({"login_via_existing_session": {"enabled": True}}) def test_uia_on(self) -> None: user_id = self.register_user(self.user, self.password) token = self.login(self.user, self.password) - channel = self.make_request("POST", endpoint, {}, access_token=token) + channel = self.make_request("POST", GET_TOKEN_ENDPOINT, {}, access_token=token) self.assertEqual(channel.code, 401) self.assertIn({"stages": ["m.login.password"]}, channel.json_body["flows"]) @@ -80,9 +81,9 @@ class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase): }, } - channel = self.make_request("POST", endpoint, uia, access_token=token) + channel = self.make_request("POST", GET_TOKEN_ENDPOINT, uia, access_token=token) self.assertEqual(channel.code, 200) - self.assertEqual(channel.json_body["expires_in"], 300) + self.assertEqual(channel.json_body["expires_in_ms"], 300000) login_token = channel.json_body["login_token"] @@ -95,15 +96,15 @@ class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase): self.assertEqual(channel.json_body["user_id"], user_id) @override_config( - {"experimental_features": {"msc3882_enabled": True, "msc3882_ui_auth": False}} + {"login_via_existing_session": {"enabled": True, "require_ui_auth": False}} ) def test_uia_off(self) -> None: user_id = self.register_user(self.user, self.password) token = self.login(self.user, self.password) - channel = self.make_request("POST", endpoint, {}, access_token=token) + channel = self.make_request("POST", GET_TOKEN_ENDPOINT, {}, access_token=token) self.assertEqual(channel.code, 200) - self.assertEqual(channel.json_body["expires_in"], 300) + self.assertEqual(channel.json_body["expires_in_ms"], 300000) login_token = channel.json_body["login_token"] @@ -117,10 +118,10 @@ class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase): @override_config( { - "experimental_features": { - "msc3882_enabled": True, - "msc3882_ui_auth": False, - "msc3882_token_timeout": "15s", + "login_via_existing_session": { + "enabled": True, + "require_ui_auth": False, + "token_timeout": "15s", } } ) @@ -128,6 +129,40 @@ class LoginTokenRequestServletTestCase(unittest.HomeserverTestCase): self.register_user(self.user, self.password) token = self.login(self.user, self.password) - channel = self.make_request("POST", endpoint, {}, access_token=token) + channel = self.make_request("POST", GET_TOKEN_ENDPOINT, {}, access_token=token) + self.assertEqual(channel.code, 200) + self.assertEqual(channel.json_body["expires_in_ms"], 15000) + + @override_config( + { + "login_via_existing_session": { + "enabled": True, + "require_ui_auth": False, + "token_timeout": "15s", + } + } + ) + def test_unstable_support(self) -> None: + # TODO: remove support for unstable MSC3882 is no longer needed + + # check feature is advertised in versions response: + channel = self.make_request( + "GET", "/_matrix/client/versions", {}, access_token=None + ) + self.assertEqual(channel.code, 200) + self.assertEqual( + channel.json_body["unstable_features"]["org.matrix.msc3882"], True + ) + + self.register_user(self.user, self.password) + token = self.login(self.user, self.password) + + # check feature is available via the unstable endpoint and returns an expires_in value in seconds + channel = self.make_request( + "POST", + "/_matrix/client/unstable/org.matrix.msc3882/login/token", + {}, + access_token=token, + ) self.assertEqual(channel.code, 200) self.assertEqual(channel.json_body["expires_in"], 15) |