In Oauth2 protocol flow when the client is issued an access token then where is that access token stored. How is that access token bind to the subsequent request. Is it stored in any cookie ?
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Currently I am using /token endpoint to obtain an access token, an ID token (by including the openid+offline_access scope), and a refresh token for the Authorization Code flow. The value for code is the authorization code that I receive in the response from the request to the /authorize endpoint.
Also to refresh access token as well as an ID token, I am sending a token request with a grant_type of refresh_token.
Below is the reference link, I am trying similar to implement in my custom OIDC application.
https://developer.okta.com/docs/guides/refresh-tokens/main/#renew-access-and-id-tokens-with-spas
Does it suppose to return both refresh_token and id_token OR both are optional if grant_type=refresh_token (also in token endpoint openid+offline_access scope added) in OpenID Connect concept?
Below is the link I am trying to understand.
https://openid.net/specs/openid-connect-core-1_0.html#RefreshTokens
When you use the refresh token, the purpose is to get a new access token. Optionally, depending on the backend configuration, you might get a new refresh token as well (if you use a one-time refresh token setup).
You never get a new ID-token back, the ID token is usually a very short-lived token (like 5 minutes) and its main purpose is to describe how the user is authenticated and who it is. The main purpose of the ID token is to create the local session (typically a session cookie), after that the ID token has no real use.
I need to understand why refresh token issued by AAD is not in JWT format( i used Auth Code grant type for generation of refresh token). It looks something like as follows 0.ATYAoWHs1YRqUk-OAYpDkwKjaYAEJhrbDpBNmWw7q0NZVas2APk....(rest of the token).
Also if we can get this refresh token in JWT format then how can we do that.
Thanks
Abhishek
It isn't in JWT format because it does not need to be.
A refresh token is data that you send to the identity provider to get new access tokens.
It should not have any other meaning for your application.
Store it securely and send it to AAD when you need new tokens.
Then take the new refresh token you get in the response and overwrite your previous refresh token with that.
The OAuth 2 RFC also talks about it https://www.rfc-editor.org/rfc/rfc6749#page-10:
A refresh token is a string representing the authorization granted to the client by the resource owner. The string is usually opaque to the client. The token denotes an identifier used to retrieve the authorization information. Unlike access tokens, refresh tokens are intended for use only with authorization servers and are never sent to resource servers.
I'm looking into Oauth2 to allow developers to authorize users of their app to use my service. I've found a few sources that say that my Authorization Server should return an access token when a user sends an assertion (JWT in my case) but that it should not return a refresh token. I'm wondering what the harm is in returning a refresh token. Developers could invalidate refresh/access tokens by calling an Api that invalidates any access granted from a particular JWT's id.
That recommendation is not correct. Refresh tokens are optional and can be issued at the discretion of the Authorization Server after client presents the authorization grant. See Oauth2 specification
1.5 Refresh tokens
Refresh tokens are credentials used to obtain access tokens. Refresh
tokens are issued to the client by the authorization server and are
used to obtain a new access token when the current access token
becomes invalid or expires, or to obtain additional access tokens
with identical or narrower scope (access tokens may have a shorter
lifetime and fewer permissions than authorized by the resource
owner). Issuing a refresh token is optional at the discretion of the
authorization server. If the authorization server issues a refresh
token, it is included when issuing an access token (i.e., step (D) in
Figure 1).
After reading the Google OAuth2 documents, I have downloaded the application_default_credentials.json and used this to get access token(bearer token).
I'm not sure if this's the standard of OAuth2. Some documents show that we need refresh token and client credential to get access token, but why not just refresh token? If I have client credential, does that mean I can get access token directly?
Yes, it is part of the OAuth2 specification that you must send the client credentials along with the refresh token. From RFC 6749, section 6:
Because refresh tokens are typically long-lasting credentials used to request additional access tokens, the refresh token is bound to the client to which it was issued. If the client type is confidential or the client was issued client credentials (or assigned other authentication requirements), the client MUST authenticate with the authorization server.
I am new to OAuth and was wondering why authorization code is required?
Why authorization does not send access token or refresh token in callback response.
why not directly access token?
The Authorization Code grant uses the short-lived one-time code so that it can be exchanged for the real token (which is longer-lived and multiple-use) in a backchannel call that is more secure and can leverage credentials to authenticate the Client towards the Authorization Server.
The Implicit grant type returns the access token directly in the authorization response. It is considered to be more insecure because it is easier to attack (using crafted redirects etc.) and because there's no way to keep a client credentials secret.