Because ORY Hydra is not just an API, but instead talks to your users' browsers directly, several security measures have been implemented in ORY Kratos. One of them is protection against CSRF:
CSRF is an attack that tricks the victim into submitting a malicious request. It inherits the identity and privileges of the victim to perform an undesired function on the victim’s behalf. For most sites, browser requests automatically include any credentials associated with the site, such as the user’s session cookie, IP address, Windows domain credentials, and so forth. Therefore, if the user is currently authenticated to the site, the site will have no way to distinguish between the forged request sent by the victim and a legitimate request sent by the victim.
Sometimes, cookies and CSRF just wont work - all requests end up with a 401 Unauthorized or 400 Bad Request. Here are some common causes and easy fixes if that happens to you!
Before starting to debug cookie and CSRF issues, make sure to check out the Chrome Developer Tools (or any comparable technology) Cookies tabs in the Application tab
as well as the network tab - look for
Set-Cookie HTTP Headers:
Google Chrome changed the behavior of
SameSite=None so that it is not possible
to use this SameSite mode without the HTTP Cookie
If you run a version of ORY Hydra 1.6 and below and experience this issue:
- Make sure to not use the
- Set configuration value
serve.cookies.same_site_modeor environment variable
Lax- this happens automatically for ORY Hydra v1.7.0 when running in HTTP mode.
Chrome rejects cookies without the
secure flag if a cookie with the same name
for the same scope (domain, path) is set that has the
secure flag. ORY Hydra
1.7.0+ uses different names for cookies with and without
secure flag. For
versions prior to that, you need to delete the cookies for the domain in order
to get them working again.
You are running ORY Hydra via HTTP but are missing the
127.0.0.1 (and in general IPs) or
localhost (and in general
available to the hostname and vice-versa.
You are running ORY Hydra behind a Reverse Proxy (e.g. Load Balancer) that strips the Cookie header. If the reverse proxy supports path rewrites that might also cause issues!
You are running the OAuth2 flow in separate browsers, or in a browser with incognito mode. The Brave browser is also known for notoriously discarding cookies when used in "No-Tracking" mode.
You are trying to do two OAuth2 flows at the same time in the same Browser.
You have changed the Cookie SameSite behavior. If this is the default value (you did not change it), this should not be an issue.
Using AJAX to call
You cannot call
/oauth2/auth using an AJAX request. It is not allowed and
not possible with OAuth2. This endpoint can only be accessed using a normal
browser request by clicking a link or redirecting the end-user's browser to that