Initial private (JWT) key registration processThe private_key_jwt authentication is based on asymmetric key, the private part is generated and only known by the client whereas the public part is communicated and registered in the authorization server for the specific client.
Private (JWT) key authentication processThe authentication flow of private_key_jwt is depicted in the diagram below
The private_key_jwt authentication consists of creating a JSON structure containing the following login attributes:
ES256 signing algorithm + above attributes + signature of them must be served in JWT format (rfc7519), see below: JWT client assertion header
|
|
JWT client assertion signature
|
All parts are encoded and separated by '.' to make up the JWT as follows
private_key_jwt assertion
|
The JWT client assertion can now be submitted to authorization server for authentication with the token endpoint (i.e. POST https://logindev.wipo.int:443/am/oauth2/access_token in the attached specification) including the following parameters for client_credentials:
POST parameter | example | Description |
|---|---|---|
| grant_type | client_credentials | OAuth2 client_credentials authentication flow is used for machine to machine communication |
| scope | das-api/das-access | Scopes (=roles), if any, separated by spaces which are required to use the DAS API |
| client_assertion_type | urn:ietf:params:oauth:client-assertion-type:jwt-bearer | The client_assertion_type indicates to the authorization server the method used to authenticate, private_key_jwt requires jwt-bearer |
| client_assertion | eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJkYXMtYXBpLWF1dG giLCJzdWIiOiJkYXMtYXBpLWF1dGgiLCJhdWQiOiJodHRwczovL2xvZ2luZG V2LndpcG8uaW50OjQ0My9hbS9vYXV0aDIvYWNjZXNzX3Rva2VuIiwiZXh wIjoxNjIyNDUwNzI4fQ.BLA6k2kKKFVm6AG-DPDpRU_5JDFGRF1dHjKul7saWCv5OxXGg4EY-J9e1p8Dg0ngD2dZ2grkJ2su7jaHy67YEw | The JWT generated in the paragraph above |
| The above token endpoint is part of third party product that supports OpenID Connect (OIDC) authentication protocol based on the OAuth 2.0 family of specifications |