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Display an error page during failure of fallback UIA. (#10561)

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Callum Brown 2021-08-18 13:13:35 +01:00 committed by GitHub
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8 changed files with 67 additions and 30 deletions
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1
changelog.d/10561.bugfix Normal file
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@ -0,0 +1 @@
Display an error on User-Interactive Authentication fallback pages when authentication fails. Contributed by Callum Brown.

8
docs/upgrade.md
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@ -125,6 +125,14 @@ environment variable.
See [using a forward proxy with Synapse documentation](setup/forward_proxy.md) for
details.
## User-interactive authentication fallback templates can now display errors
This may affect you if you make use of custom HTML templates for the
[reCAPTCHA](../synapse/res/templates/recaptcha.html) or
[terms](../synapse/res/templates/terms.html) fallback pages.
The template is now provided an `error` variable if the authentication
process failed. See the default templates linked above for an example.
# Upgrading to v1.39.0

17
synapse/handlers/auth.py
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@ -627,23 +627,28 @@ class AuthHandler(BaseHandler):
async def add_oob_auth(
self, stagetype: str, authdict: Dict[str, Any], clientip: str
) -> bool:
) -> None:
"""
Adds the result of out-of-band authentication into an existing auth
session. Currently used for adding the result of fallback auth.
Raises:
LoginError if the stagetype is unknown or the session is missing.
LoginError is raised by check_auth if authentication fails.
"""
if stagetype not in self.checkers:
raise LoginError(400, "", Codes.MISSING_PARAM)
raise LoginError(
400, f"Unknown UIA stage type: {stagetype}", Codes.INVALID_PARAM
)
if "session" not in authdict:
raise LoginError(400, "", Codes.MISSING_PARAM)
raise LoginError(400, "Missing session ID", Codes.MISSING_PARAM)
# If authentication fails a LoginError is raised. Otherwise, store
# the successful result.
result = await self.checkers[stagetype].check_auth(authdict, clientip)
if result:
await self.store.mark_ui_auth_stage_complete(
authdict["session"], stagetype, result
)
return True
return False
def get_session_id(self, clientdict: Dict[str, Any]) -> Optional[str]:
"""

10
synapse/handlers/ui_auth/checkers.py
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@ -49,7 +49,7 @@ class UserInteractiveAuthChecker:
clientip: The IP address of the client.
Raises:
SynapseError if authentication failed
LoginError if authentication failed.
Returns:
The result of authentication (to pass back to the client?)
@ -131,7 +131,9 @@ class RecaptchaAuthChecker(UserInteractiveAuthChecker):
)
if resp_body["success"]:
return True
raise LoginError(401, "", errcode=Codes.UNAUTHORIZED)
raise LoginError(
401, "Captcha authentication failed", errcode=Codes.UNAUTHORIZED
)
class _BaseThreepidAuthChecker:
@ -191,7 +193,9 @@ class _BaseThreepidAuthChecker:
raise AssertionError("Unrecognized threepid medium: %s" % (medium,))
if not threepid:
raise LoginError(401, "", errcode=Codes.UNAUTHORIZED)
raise LoginError(
401, "Unable to get validated threepid", errcode=Codes.UNAUTHORIZED
)
if threepid["medium"] != medium:
raise LoginError(

3
synapse/res/templates/recaptcha.html
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@ -16,6 +16,9 @@ function captchaDone() {
<body>
<form id="registrationForm" method="post" action="{{ myurl }}">
<div>
{% if error is defined %}
<p class="error"><strong>Error: {{ error }}</strong></p>
{% endif %}
<p>
Hello! We need to prevent computer programs and other automated
things from creating accounts on this server.

3
synapse/res/templates/terms.html
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@ -8,6 +8,9 @@
<body>
<form id="registrationForm" method="post" action="{{ myurl }}">
<div>
{% if error is defined %}
<p class="error"><strong>Error: {{ error }}</strong></p>
{% endif %}
<p>
Please click the button below if you agree to the
<a href="{{ terms_url }}">privacy policy of this homeserver.</a>

31
synapse/rest/client/auth.py
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@ -16,7 +16,7 @@ import logging
from typing import TYPE_CHECKING
from synapse.api.constants import LoginType
from synapse.api.errors import SynapseError
from synapse.api.errors import LoginError, SynapseError
from synapse.api.urls import CLIENT_API_PREFIX
from synapse.http.server import respond_with_html
from synapse.http.servlet import RestServlet, parse_string
@ -95,29 +95,32 @@ class AuthRestServlet(RestServlet):
authdict = {"response": response, "session": session}
success = await self.auth_handler.add_oob_auth(
try:
await self.auth_handler.add_oob_auth(
LoginType.RECAPTCHA, authdict, request.getClientIP()
)
if success:
html = self.success_template.render()
else:
except LoginError as e:
# Authentication failed, let user try again
html = self.recaptcha_template.render(
session=session,
myurl="%s/r0/auth/%s/fallback/web"
% (CLIENT_API_PREFIX, LoginType.RECAPTCHA),
sitekey=self.hs.config.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}
success = await self.auth_handler.add_oob_auth(
try:
await self.auth_handler.add_oob_auth(
LoginType.TERMS, authdict, request.getClientIP()
)
if success:
html = self.success_template.render()
else:
except LoginError as e:
# Authentication failed, let user try again
html = self.terms_template.render(
session=session,
terms_url="%s_matrix/consent?v=%s"
@ -127,10 +130,16 @@ class AuthRestServlet(RestServlet):
),
myurl="%s/r0/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.")
else:
raise SynapseError(404, "Unknown auth stage type")

4
synapse/static/client/register/style.css
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@ -58,3 +58,7 @@ textarea, input {
background-color: #f8f8f8;
border: 1px #ccc solid;
}
.error {
color: red;
}