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#
# This file is licensed under the Affero General Public License (AGPL) version 3.
#
# Copyright 2015, 2016 OpenMarket Ltd
# Copyright (C) 2023 New Vector, Ltd
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU Affero General Public License as
# published by the Free Software Foundation, either version 3 of the
# License, or (at your option) any later version.
#
# See the GNU Affero General Public License for more details:
# <https://www.gnu.org/licenses/agpl-3.0.html>.
#
# Originally licensed under the Apache License, Version 2.0:
# <http://www.apache.org/licenses/LICENSE-2.0>.
#
# [This file includes modifications made by New Vector Limited]
#
#
import logging
from typing import TYPE_CHECKING
from twisted.web.server import Request
from synapse.api.auth.mas import MasDelegatedAuth
from synapse.api.constants import LoginType
from synapse.api.errors import LoginError, SynapseError
from synapse.api.urls import CLIENT_API_PREFIX
from synapse.http.server import HttpServer, respond_with_html, respond_with_redirect
from synapse.http.servlet import RestServlet, parse_string
from synapse.http.site import SynapseRequest
from ._base import client_patterns
if TYPE_CHECKING:
from synapse.server import HomeServer
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: "HomeServer"):
super().__init__()
self.hs = hs
self.auth = hs.get_auth()
self.auth_handler = hs.get_auth_handler()
self.registration_handler = hs.get_registration_handler()
self.recaptcha_template = hs.config.captcha.recaptcha_template
self.terms_template = hs.config.consent.terms_template
self.registration_token_template = (
hs.config.registration.registration_token_template
)
self.success_template = hs.config.registration.fallback_success_template
async def on_GET(self, request: SynapseRequest, stagetype: str) -> None:
session = parse_string(request, "session")
if not session:
raise SynapseError(400, "No session supplied")
# We support the unstable (`org.matrix.cross_signing_reset`) name from MSC4312 until
# enough clients have adopted the stable name (`m.oauth`).
# Note: `org.matrix.cross_signing_reset` *is* the stable name of the *action* in the
# authorization server metadata. The unstable status only applies to the UIA stage name.
if stagetype == "m.oauth" or stagetype == "org.matrix.cross_signing_reset":
if self.hs.config.mas.enabled:
assert isinstance(self.auth, MasDelegatedAuth)
url = await self.auth.account_management_url()
url = f"{url}?action=org.matrix.cross_signing_reset"
return respond_with_redirect(
request,
url.encode(),
)
elif self.hs.config.experimental.msc3861.enabled:
# If MSC3861 is enabled, we can assume self._auth is an instance of MSC3861DelegatedAuth
# We import lazily here because of the authlib requirement
from synapse.api.auth.msc3861_delegated import MSC3861DelegatedAuth
assert isinstance(self.auth, MSC3861DelegatedAuth)
base = await self.auth.account_management_url()
if base is not None:
url = f"{base}?action=org.matrix.cross_signing_reset"
else:
url = await self.auth.issuer()
return respond_with_redirect(request, url.encode())
if stagetype == LoginType.RECAPTCHA:
html = self.recaptcha_template.render(
session=session,
myurl="%s/v3/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.RECAPTCHA),
sitekey=self.hs.config.captcha.recaptcha_public_key,
)
elif stagetype == LoginType.TERMS:
html = self.terms_template.render(
session=session,
terms_url="%s_matrix/consent?v=%s"
% (
self.hs.config.server.public_baseurl,
self.hs.config.consent.user_consent_version,
),
myurl="%s/v3/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.
html = await self.auth_handler.start_sso_ui_auth(request, session)
elif stagetype == LoginType.REGISTRATION_TOKEN:
html = self.registration_token_template.render(
session=session,
myurl=f"{CLIENT_API_PREFIX}/r0/auth/{LoginType.REGISTRATION_TOKEN}/fallback/web",
)
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: Request, stagetype: str) -> None:
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}
try:
await self.auth_handler.add_oob_auth(
LoginType.RECAPTCHA, authdict, request.getClientAddress().host
)
except LoginError as e:
# Authentication failed, let user try again
html = self.recaptcha_template.render(
session=session,
myurl="%s/v3/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.RECAPTCHA),
sitekey=self.hs.config.captcha.recaptcha_public_key,
error=e.msg,
)
else:
# No LoginError was raised, so authentication was successful
html = self.success_template.render()
elif stagetype == LoginType.TERMS:
authdict = {"session": session}
try:
await self.auth_handler.add_oob_auth(
LoginType.TERMS, authdict, request.getClientAddress().host
)
except LoginError as e:
# Authentication failed, let user try again
html = self.terms_template.render(
session=session,
terms_url="%s_matrix/consent?v=%s"
% (
self.hs.config.server.public_baseurl,
self.hs.config.consent.user_consent_version,
),
myurl="%s/v3/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.TERMS),
error=e.msg,
)
else:
# No LoginError was raised, so authentication was successful
html = self.success_template.render()
elif stagetype == LoginType.SSO:
# The SSO fallback workflow should not post here,
raise SynapseError(404, "Fallback SSO auth does not support POST requests.")
elif stagetype == LoginType.REGISTRATION_TOKEN:
token = parse_string(request, "token", required=True)
authdict = {"session": session, "token": token}
try:
await self.auth_handler.add_oob_auth(
LoginType.REGISTRATION_TOKEN,
authdict,
request.getClientAddress().host,
)
except LoginError as e:
html = self.registration_token_template.render(
session=session,
myurl=f"{CLIENT_API_PREFIX}/r0/auth/{LoginType.REGISTRATION_TOKEN}/fallback/web",
error=e.msg,
)
else:
html = self.success_template.render()
else:
raise SynapseError(404, "Unknown auth stage type")
# Render the HTML and return.
respond_with_html(request, 200, html)
return None
def register_servlets(hs: "HomeServer", http_server: HttpServer) -> None:
AuthRestServlet(hs).register(http_server)
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