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# -*- coding: utf-8 -*-
# Copyright 2015 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.
from twisted.internet import defer
from synapse.api.constants import LoginType
from synapse.api.errors import SynapseError
from synapse.api.urls import CLIENT_V2_ALPHA_PREFIX
from synapse.http.servlet import RestServlet
from ._base import client_v2_pattern
import logging
logger = logging.getLogger(__name__)
RECAPTCHA_TEMPLATE = """
<html>
<head>
<title>Authentication</title>
<meta name='viewport' content='width=device-width, initial-scale=1,
user-scalable=no, minimum-scale=1.0, maximum-scale=1.0'>
<script src="https://www.google.com/recaptcha/api.js"
async defer></script>
<script src="//code.jquery.com/jquery-1.11.2.min.js"></script>
<link rel="stylesheet" href="/_matrix/static/client/register/style.css">
<script>
function captchaDone() {
$('#registrationForm').submit();
}
</script>
</head>
<body>
<form id="registrationForm" method="post" action="%(myurl)s">
<div>
<p>
Hello! We need to prevent computer programs and other automated
things from creating accounts on this server.
</p>
<p>
Please verify that you're not a robot.
</p>
<input type="hidden" name="session" value="%(session)s" />
<div class="g-recaptcha"
data-sitekey="%(sitekey)s"
data-callback="captchaDone">
</div>
<noscript>
<input type="submit" value="All Done" />
</noscript>
</div>
</div>
</form>
</body>
</html>
"""
SUCCESS_TEMPLATE = """
<html>
<head>
<title>Success!</title>
<meta name='viewport' content='width=device-width, initial-scale=1,
user-scalable=no, minimum-scale=1.0, maximum-scale=1.0'>
<link rel="stylesheet" href="/_matrix/static/client/register/style.css">
<script>
if (window.onAuthDone != undefined) {
window.onAuthDone();
}
</script>
</head>
<body>
<div>
<p>Thank you</p>
<p>You may now close this window and return to the application</p>
</div>
</body>
</html>
"""
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.
"""
PATTERN = client_v2_pattern("/auth/(?P<stagetype>[\w\.]*)/fallback/web")
def __init__(self, hs):
super(AuthRestServlet, self).__init__()
self.hs = hs
self.auth = hs.get_auth()
self.auth_handler = hs.get_handlers().auth_handler
self.registration_handler = hs.get_handlers().registration_handler
@defer.inlineCallbacks
def on_GET(self, request, stagetype):
yield
if stagetype == LoginType.RECAPTCHA:
if ('session' not in request.args or
len(request.args['session']) == 0):
raise SynapseError(400, "No session supplied")
session = request.args["session"][0]
html = RECAPTCHA_TEMPLATE % {
'session': session,
'myurl': "%s/auth/%s/fallback/web" % (
CLIENT_V2_ALPHA_PREFIX, LoginType.RECAPTCHA
),
'sitekey': self.hs.config.recaptcha_public_key,
}
html_bytes = html.encode("utf8")
request.setResponseCode(200)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Server", self.hs.version_string)
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
request.write(html_bytes)
request.finish()
defer.returnValue(None)
else:
raise SynapseError(404, "Unknown auth stage type")
@defer.inlineCallbacks
def on_POST(self, request, stagetype):
yield
if stagetype == "m.login.recaptcha":
if ('g-recaptcha-response' not in request.args or
len(request.args['g-recaptcha-response'])) == 0:
raise SynapseError(400, "No captcha response supplied")
if ('session' not in request.args or
len(request.args['session'])) == 0:
raise SynapseError(400, "No session supplied")
session = request.args['session'][0]
authdict = {
'response': request.args['g-recaptcha-response'][0],
'session': session,
}
success = yield self.auth_handler.add_oob_auth(
LoginType.RECAPTCHA,
authdict,
self.hs.get_ip_from_request(request)
)
if success:
html = SUCCESS_TEMPLATE
else:
html = RECAPTCHA_TEMPLATE % {
'session': session,
'myurl': "%s/auth/%s/fallback/web" % (
CLIENT_V2_ALPHA_PREFIX, LoginType.RECAPTCHA
),
'sitekey': self.hs.config.recaptcha_public_key,
}
html_bytes = html.encode("utf8")
request.setResponseCode(200)
request.setHeader(b"Content-Type", b"text/html; charset=utf-8")
request.setHeader(b"Server", self.hs.version_string)
request.setHeader(b"Content-Length", b"%d" % (len(html_bytes),))
request.write(html_bytes)
request.finish()
defer.returnValue(None)
else:
raise SynapseError(404, "Unknown auth stage type")
def on_OPTIONS(self, _):
return 200, {}
def register_servlets(hs, http_server):
AuthRestServlet(hs).register(http_server)
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