问题
Implementing SSO in my application and from app-1 i need to make a rest call to app-2. Login in app-1 with SAML and authenticated successfully and trying for rest call from app-1 with openid but since authentication is using saml only so not able to get the access/bearer token. Please help how to get the access/bearer token from saml request/response. I'm using Keycloak Server for SSO implementation.
回答1:
You can't.
REST API need a JWT token not a SAML one.
Change SAML to OpenID Connect and it will work.
回答2:
(1) OpenID Connect 1.0 is a simple identity layer on top of the OAuth 2.0 protocol. It allows Clients to verify the identity of the End-User based on the authentication performed by an Authorization Server, as well as to obtain basic profile information about the End-User in an interoperable and REST-like manner.
(2) Presently there is no IETF draft document regarding SAML 2.0 Profile for OpenID Connect client.
We can refer to the IETF draft document SAML 2.0 Profile for OAuth 2.0 client.
The OAuth 2.0 Access Token using SAML Assertion filter enables an OAuth client to request an access token using a SAML assertion. This supports the OAuth 2.0 SAML flow, which is used when a client wishes to utilize an existing trust relationship, expressed through the semantics of the SAML assertion, without a direct user approval step at the authorization server. For more details on supported OAuth flows, see API Gateway OAuth 2.0 authentication flows.
(3) Both Auth0 and open-source WSO2 Identity Server implement the SAML profile for OpenID Connect/OAuth to convert SAML token to OpenID Connect/OAuth token, as demonstrated by Auth0 SAML Configuration and WSO2 Adding and Configuring an Identity Provider. In other words, Auth0 and WSO2 Identity Server can relay SAML authentication provided by SAML IdP to either OpenID Connect client or OAuth 2.0 client.
来源：https://stackoverflow.com/questions/56232620/how-to-make-openid-call-from-saml-request