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OAuth 2.0 Proxy

OAuth2-proxy is a project which allows services to delegate the authentication flow to a IDP, for example ZITADEL

Configure ZITADEL​

Setup Application and get Keys​

Before we can start building our application we have do do a few configuration steps in ZITADEL Console. You will need to provide some information about your app. We recommend creating a new app to start from scratch. Navigate to your project and add a new application at the top of the page. Select Web Application and continue. We recommend that you use Authorization Code for the OAuth 2.0 Proxy.

Make sure Authentication Method is set to BASIC and the Application Type is set to Web.

Redirect URLs​

A redirect URL is a URL in your application where ZITADEL redirects the user after they have authenticated. Set your url to the domain the proxy will be deployed to or use the default one http://127.0.0.1:4180/oauth2/callback.

If you are following along with the sample project you downloaded from our templates, you should set the Allowed Callback URL to http://localhost:4200/auth/callback. You will also have to set dev mode to true as this will enable unsecure http for the moment.

If you want to redirect the users back to a route on your application after they have logged out, add an optional redirect in the post redirectURI field.

Continue and Create the application.

Client ID and Secret​

After successful app creation a popup will appear showing you your clientID as well as a secret. Copy your client ID and Secrets as it will be needed in the next step.

Note: You will be able to regenerate the secret at a later time if you loose it.

OAuth 2.0 Proxy Setup​

Authentication Example​

provider = "oidc"
user_id_claim = "sub" #uses the subject as ID instead of the email
provider_display_name = "ZITADEL"
redirect_url = "http://127.0.0.1:4180/oauth2/callback"
oidc_issuer_url = "https://{your_domain}.zitadel.cloud"
upstreams = [
    "https://example.corp.com"
]
email_domains = [
    "*"
]
client_id = "{ZITADEL_GENERATED_CLIENT_ID}"
client_secret = "{ZITADEL_GENERATED_CLIENT_SECRET}"
pass_access_token = true
cookie_secret = "{SUPPLY_SOME_SECRET_HERE}"
skip_provider_button = true
cookie_secure = false #localdev only false
http_address = "127.0.0.1:4180" #localdev only

This was tested with version oauth2-proxy v7.4.0 (built with go1.20.0)

Check for groups​

If you want oauth2-proxy to check for roles in the tokens you have to add an action in ZITADEL to complement the token according to this example and add the following configuration to the config:

oidc_groups_claim = "{your_actions_group_key}"
allowed_groups = ["list", "of", "allowed", "roles"]

Completion​

You have successfully integrated ZITADEL in your proxy!

What next?​