forked-synapse/synapse/rest/client/v1/login.py
Richard van der Hoff d2c616a413
Combine the SSO Redirect Servlets (#9015)
* Implement CasHandler.handle_redirect_request

... to make it match OidcHandler and SamlHandler

* Clean up interface for OidcHandler.handle_redirect_request

Make it accept `client_redirect_url=None`.

* Clean up interface for `SamlHandler.handle_redirect_request`

... bring it into line with CAS and OIDC by making it take a Request parameter,
move the magic for `client_redirect_url` for UIA into the handler, and fix the
return type to be a `str` rather than a `bytes`.

* Define a common protocol for SSO auth provider impls

* Give SsoIdentityProvider an ID and register them

* Combine the SSO Redirect servlets

Now that the SsoHandler knows about the identity providers, we can combine the
various *RedirectServlets into a single implementation which delegates to the
right IdP.

* changelog
2021-01-04 18:13:49 +00:00

370 lines
14 KiB
Python

# -*- coding: utf-8 -*-
# Copyright 2014-2016 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 typing import TYPE_CHECKING, Awaitable, Callable, Dict, Optional
from synapse.api.errors import Codes, LoginError, SynapseError
from synapse.api.ratelimiting import Ratelimiter
from synapse.appservice import ApplicationService
from synapse.http.server import finish_request
from synapse.http.servlet import (
RestServlet,
parse_json_object_from_request,
parse_string,
)
from synapse.http.site import SynapseRequest
from synapse.rest.client.v2_alpha._base import client_patterns
from synapse.rest.well_known import WellKnownBuilder
from synapse.types import JsonDict, UserID
if TYPE_CHECKING:
from synapse.server import HomeServer
logger = logging.getLogger(__name__)
class LoginRestServlet(RestServlet):
PATTERNS = client_patterns("/login$", v1=True)
CAS_TYPE = "m.login.cas"
SSO_TYPE = "m.login.sso"
TOKEN_TYPE = "m.login.token"
JWT_TYPE = "org.matrix.login.jwt"
JWT_TYPE_DEPRECATED = "m.login.jwt"
APPSERVICE_TYPE = "uk.half-shot.msc2778.login.application_service"
def __init__(self, hs: "HomeServer"):
super().__init__()
self.hs = hs
# JWT configuration variables.
self.jwt_enabled = hs.config.jwt_enabled
self.jwt_secret = hs.config.jwt_secret
self.jwt_algorithm = hs.config.jwt_algorithm
self.jwt_issuer = hs.config.jwt_issuer
self.jwt_audiences = hs.config.jwt_audiences
# SSO configuration.
self.saml2_enabled = hs.config.saml2_enabled
self.cas_enabled = hs.config.cas_enabled
self.oidc_enabled = hs.config.oidc_enabled
self.auth = hs.get_auth()
self.auth_handler = self.hs.get_auth_handler()
self.registration_handler = hs.get_registration_handler()
self._well_known_builder = WellKnownBuilder(hs)
self._address_ratelimiter = Ratelimiter(
clock=hs.get_clock(),
rate_hz=self.hs.config.rc_login_address.per_second,
burst_count=self.hs.config.rc_login_address.burst_count,
)
self._account_ratelimiter = Ratelimiter(
clock=hs.get_clock(),
rate_hz=self.hs.config.rc_login_account.per_second,
burst_count=self.hs.config.rc_login_account.burst_count,
)
def on_GET(self, request: SynapseRequest):
flows = []
if self.jwt_enabled:
flows.append({"type": LoginRestServlet.JWT_TYPE})
flows.append({"type": LoginRestServlet.JWT_TYPE_DEPRECATED})
if self.cas_enabled:
# we advertise CAS for backwards compat, though MSC1721 renamed it
# to SSO.
flows.append({"type": LoginRestServlet.CAS_TYPE})
if self.cas_enabled or self.saml2_enabled or self.oidc_enabled:
flows.append({"type": LoginRestServlet.SSO_TYPE})
# While its 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})
flows.extend(
({"type": t} for t in self.auth_handler.get_supported_login_types())
)
flows.append({"type": LoginRestServlet.APPSERVICE_TYPE})
return 200, {"flows": flows}
async def on_POST(self, request: SynapseRequest):
login_submission = parse_json_object_from_request(request)
try:
if login_submission["type"] == LoginRestServlet.APPSERVICE_TYPE:
appservice = self.auth.get_appservice_by_req(request)
if appservice.is_rate_limited():
self._address_ratelimiter.ratelimit(request.getClientIP())
result = await self._do_appservice_login(login_submission, appservice)
elif self.jwt_enabled and (
login_submission["type"] == LoginRestServlet.JWT_TYPE
or login_submission["type"] == LoginRestServlet.JWT_TYPE_DEPRECATED
):
self._address_ratelimiter.ratelimit(request.getClientIP())
result = await self._do_jwt_login(login_submission)
elif login_submission["type"] == LoginRestServlet.TOKEN_TYPE:
self._address_ratelimiter.ratelimit(request.getClientIP())
result = await self._do_token_login(login_submission)
else:
self._address_ratelimiter.ratelimit(request.getClientIP())
result = await self._do_other_login(login_submission)
except KeyError:
raise SynapseError(400, "Missing JSON keys.")
well_known_data = self._well_known_builder.get_well_known()
if well_known_data:
result["well_known"] = well_known_data
return 200, result
async def _do_appservice_login(
self, login_submission: JsonDict, appservice: ApplicationService
):
identifier = login_submission.get("identifier")
logger.info("Got appservice login request with identifier: %r", identifier)
if not isinstance(identifier, dict):
raise SynapseError(
400, "Invalid identifier in login submission", Codes.INVALID_PARAM
)
# this login flow only supports identifiers of type "m.id.user".
if identifier.get("type") != "m.id.user":
raise SynapseError(
400, "Unknown login identifier type", Codes.INVALID_PARAM
)
user = identifier.get("user")
if not isinstance(user, str):
raise SynapseError(400, "Invalid user in identifier", Codes.INVALID_PARAM)
if user.startswith("@"):
qualified_user_id = user
else:
qualified_user_id = UserID(user, self.hs.hostname).to_string()
if not appservice.is_interested_in_user(qualified_user_id):
raise LoginError(403, "Invalid access_token", errcode=Codes.FORBIDDEN)
return await self._complete_login(
qualified_user_id, login_submission, ratelimit=appservice.is_rate_limited()
)
async def _do_other_login(self, login_submission: JsonDict) -> Dict[str, str]:
"""Handle non-token/saml/jwt logins
Args:
login_submission:
Returns:
HTTP response
"""
# Log the request we got, but only certain fields to minimise the chance of
# logging someone's password (even if they accidentally put it in the wrong
# field)
logger.info(
"Got login request with identifier: %r, medium: %r, address: %r, user: %r",
login_submission.get("identifier"),
login_submission.get("medium"),
login_submission.get("address"),
login_submission.get("user"),
)
canonical_user_id, callback = await self.auth_handler.validate_login(
login_submission, ratelimit=True
)
result = await self._complete_login(
canonical_user_id, login_submission, callback
)
return result
async def _complete_login(
self,
user_id: str,
login_submission: JsonDict,
callback: Optional[Callable[[Dict[str, str]], Awaitable[None]]] = None,
create_non_existent_users: bool = False,
ratelimit: bool = True,
) -> Dict[str, str]:
"""Called when we've successfully authed the user and now need to
actually login them in (e.g. create devices). This gets called on
all successful logins.
Applies the ratelimiting for successful login attempts against an
account.
Args:
user_id: ID of the user to register.
login_submission: Dictionary of login information.
callback: Callback function to run after login.
create_non_existent_users: Whether to create the user if they don't
exist. Defaults to False.
ratelimit: Whether to ratelimit the login request.
Returns:
result: Dictionary of account information after successful login.
"""
# Before we actually log them in we check if they've already logged in
# too often. This happens here rather than before as we don't
# necessarily know the user before now.
if ratelimit:
self._account_ratelimiter.ratelimit(user_id.lower())
if create_non_existent_users:
canonical_uid = await self.auth_handler.check_user_exists(user_id)
if not canonical_uid:
canonical_uid = await self.registration_handler.register_user(
localpart=UserID.from_string(user_id).localpart
)
user_id = canonical_uid
device_id = login_submission.get("device_id")
initial_display_name = login_submission.get("initial_device_display_name")
device_id, access_token = await self.registration_handler.register_device(
user_id, device_id, initial_display_name
)
result = {
"user_id": user_id,
"access_token": access_token,
"home_server": self.hs.hostname,
"device_id": device_id,
}
if callback is not None:
await callback(result)
return result
async def _do_token_login(self, login_submission: JsonDict) -> Dict[str, str]:
"""
Handle the final stage of SSO login.
Args:
login_submission: The JSON request body.
Returns:
The body of the JSON response.
"""
token = login_submission["token"]
auth_handler = self.auth_handler
user_id = await auth_handler.validate_short_term_login_token_and_get_user_id(
token
)
return await self._complete_login(
user_id, login_submission, self.auth_handler._sso_login_callback
)
async def _do_jwt_login(self, login_submission: JsonDict) -> Dict[str, str]:
token = login_submission.get("token", None)
if token is None:
raise LoginError(
403, "Token field for JWT is missing", errcode=Codes.FORBIDDEN
)
import jwt
try:
payload = jwt.decode(
token,
self.jwt_secret,
algorithms=[self.jwt_algorithm],
issuer=self.jwt_issuer,
audience=self.jwt_audiences,
)
except jwt.PyJWTError as e:
# A JWT error occurred, return some info back to the client.
raise LoginError(
403, "JWT validation failed: %s" % (str(e),), errcode=Codes.FORBIDDEN,
)
user = payload.get("sub", None)
if user is None:
raise LoginError(403, "Invalid JWT", errcode=Codes.FORBIDDEN)
user_id = UserID(user, self.hs.hostname).to_string()
result = await self._complete_login(
user_id, login_submission, create_non_existent_users=True
)
return result
class SsoRedirectServlet(RestServlet):
PATTERNS = client_patterns("/login/(cas|sso)/redirect", v1=True)
def __init__(self, hs: "HomeServer"):
# make sure that the relevant handlers are instantiated, so that they
# register themselves with the main SSOHandler.
if hs.config.cas_enabled:
hs.get_cas_handler()
elif hs.config.saml2_enabled:
hs.get_saml_handler()
elif hs.config.oidc_enabled:
hs.get_oidc_handler()
self._sso_handler = hs.get_sso_handler()
async def on_GET(self, request: SynapseRequest):
client_redirect_url = parse_string(
request, "redirectUrl", required=True, encoding=None
)
sso_url = await self._sso_handler.handle_redirect_request(
request, client_redirect_url
)
logger.info("Redirecting to %s", sso_url)
request.redirect(sso_url)
finish_request(request)
class CasTicketServlet(RestServlet):
PATTERNS = client_patterns("/login/cas/ticket", v1=True)
def __init__(self, hs):
super().__init__()
self._cas_handler = hs.get_cas_handler()
async def on_GET(self, request: SynapseRequest) -> None:
client_redirect_url = parse_string(request, "redirectUrl")
ticket = parse_string(request, "ticket", required=True)
# Maybe get a session ID (if this ticket is from user interactive
# authentication).
session = parse_string(request, "session")
# Either client_redirect_url or session must be provided.
if not client_redirect_url and not session:
message = "Missing string query parameter redirectUrl or session"
raise SynapseError(400, message, errcode=Codes.MISSING_PARAM)
await self._cas_handler.handle_ticket(
request, ticket, client_redirect_url, session
)
def register_servlets(hs, http_server):
LoginRestServlet(hs).register(http_server)
SsoRedirectServlet(hs).register(http_server)
if hs.config.cas_enabled:
CasTicketServlet(hs).register(http_server)