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Authorization Grant without Client Secret

This approach is only required for WSO2 Identity Server 5.6.0 and older versions.

For IS 5.7.0 above you can simply enable the 'Allow authentication without the client secret' option in the OAuth2 configurations (ie. you can skip steps 1 to 3). (https://docs.wso2.com/display/IS570/Configuring+OAuth2-OpenID+Connect+Single-Sign-On).

This repo contains artifacts and configurations required to use authorization grant flow without client_secret for public clients.

Download WSO2 Identity Server at https://wso2.com/identity-and-access-management or for the latest milestone go to https://github.com/wso2/product-is/releases

Steps to try out,

  1. Build the jar and place it in WSO2_HOME/repository/components/lib This jar contains two extension classes

    1. ExtendedAuthzGrantValidator --> Removes the strict client validation requirement for authorization code grant. Configuration involved explained in step #2
    2. ExtendedBasicAuthClientHandler -> Overrides the default behaviour of strict client authentication for authorization grant. Configuration involved explained in step #3
    • Override the default grant validator for Authorization Code Grant type. The default validator enforces client authentication and we need to get rid of that.
<OAuth>
       ....
     <SupportedGrantTypes>
                <SupportedGrantType>
                    <GrantTypeName>authorization_code</GrantTypeName>
                    <GrantTypeHandlerImplClass>org.wso2.carbon.identity.oauth2.token.handlers.grant.AuthorizationCodeGrantHandler</GrantTypeHandlerImplClass>
                    <GrantTypeValidatorImplClass>org.wso2.carbon.identity.oauth2.grant.validator.ExtendedAuthzGrantValidator</GrantTypeValidatorImplClass>
                </SupportedGrantType>
     </SupportedGrantTypes>
      ....
</OAuth>
  1. Change the WSO2_HOME/repository/conf/identity/identity.xml as follows.
<OAuth>
   ....
       <ClientAuthHandlers>
            <!--ClientAuthHandler Class="org.wso2.carbon.identity.oauth2.token.handlers.clientauth.BasicAuthClientAuthHandler">
                <Property Name="StrictClientCredentialValidation">false</Property>
            </ClientAuthHandler-->
            <ClientAuthHandler Class="org.wso2.carbon.identity.oauth2.client.auth.handler.ExtendedBasicAuthClientHandler">
                <Property Name="StrictClientCredentialValidation">false</Property>
                <Property Name="StrictClientCredentialValidationForAuthzCodeGrant">false</Property>
            </ClientAuthHandler>
        </ClientAuthHandlers>
    ....
</OAuth>

  1. Startup the server

  2. Create an oauth application

curl -k -X POST https://localhost:9443/identity/connect/register -H 'authorization: Basic YWRtaW46YWRtaW4=' -H 'content-type: application/json' -d '{"redirect_uris": ["https://localhost/callback"],"client_name": "authz_code_test","ext_param_owner": "application_owner","grant_types": ["authorization_code password client_credentials"]}'

Response:

{"grant_types":["authorization_code","password","client_credentials"],"client_secret_expires_at":"0","redirect_uris":["https:\/\/localhost\/callback"],"client_secret":"bhf5pVEKOwwMhwyGLJ1mz70mQdYa","client_name":"admin_authz_code_test","client_id":"XALwgcRGsR4zud4RsokMmtNm3xQa"}
  1. Get an authorization code, (Refer: https://farasath.blogspot.com/2017/10/oauth2-authorization-code-flow-without.html you can skip the Service Provider creation part)
https://localhost:9443/oauth2/authorize?response_type=code&client_id=XALwgcRGsR4zud4RsokMmtNm3xQa&redirect_uri=https://localhost/callback&scope=read

Response After authentication and consent

https://localhost/callback?code=2cb973ea-50de-3dc9-91af-ef4b1978a80f
  1. Get the access token (Note: we don't sent client secret in the authorization header. Instead we only sent clien_id as a request param)
curl -k -v -d "grant_type=authorization_code&code=2cb973ea-50de-3dc9-91af-ef4b1978a80f&redirect_uri=https://localhost/callback&client_id=XALwgcRGsR4zud4RsokMmtNm3xQa" https://localhost:9443/oauth2/token