Hi,
we're trying to add CAS as an OpenID Connect to provider for an OpenProject
installation.
We've gotten as far as the user being redirected to CAS to login and coming
back to OpenProject.
However, the issue then is that there are no user attributes in the
userinfo response directly (on the same level as 'sub' for instance).
Instead all the attributes are one level below under 'attributes'.
{
"sub"=>"admin",
"service"=>"https://192.168.56.10/openproject/auth/cas/callback";,
"auth_time"=>1715934410,
"attributes"=>{
"mail"=>"ad...@example.net",
"displayName"=>"admin",
"surname"=>"admin",
"givenName"=>"admin",
"groups"=>["admin"],
"cn"=>"admin",
"username"=>"admin"
},
According to the OpenID Connect specification [2] these attributes should
be one level higher, though.
Like this:
{
"sub"=>"admin",
"name"=>"admin admin",
"family_name"=>"admin",
"given_name"=>"admin",
"email"=>"ad...@example.net"
}
I found the same issue in [1] but it seems it was never resolved.
I'm 99% sure this is not an issue on the OpenProject side which simply uses
default gems/libraries for the OpenID Connect things and works just fine
with Google, MS Entra, Keycloak etc. via OpenID Connect.
So I suspect this must be an option on the CAS side.
Is there any hint I can give the people running the CAS instance as to what
to look for?
Best regards,
Markus
[1] [cas-user] CAS 6.2.1 OpenID Connect OP attribute release issues
(google.com)
<https://groups.google.com/a/apereo.org/g/cas-user/c/T9EeA_JXhqw>
[2] https://openid.net/specs/openid-connect-basic-1_0.html#StandardClaims
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