# Test OpenID Connect with command line tools

We present here how to test the OpenID Connect protocol (authorization code flow) with commande line tools, like curl.

We use in this example a public OIDC provider based on LL::NG: https://oidctest.wsweet.org

## Authentication

The first step is to obtain a valid SSO session on the portal. Several solutions:

  - Use a web browser and log into the portal, then get the value of the SSO cookie

  - Use portal REST API, and adapt the requireToken configuration to get cookie value in JSON response (see REST services)

Example of REST service usage, with credentials dwho/dwho:

    curl -X POST -d user=dwho -d password=dwho -H 'Accept: application/json' 'https://oidctest.wsweet.org/oauth2/'

The session id is displayed in JSON response:

    {
     "error" : "0",
     "id" : "0640f95827111f00ba7ad5863ba819fe46cfbcecdb18ce525836369fb4c8350b",
     "result" : 1
    }

## Authorization code

In the first step of authorization code flow, we request a temporary code, ont the authorize end point.

Parameters needed:

  - SSO session id (will be passed in lemonldap cookie, adapt the name if needed)

  - Client ID: given by your OIDC provider, we use here private

  - Scope: depends on which information you need, we will use here openid profile email

  - Redirect URI: shoud match the value registered in your OIDC provider, we will use here http://localhost

The OIDC provide will return the code in the location header, so we just output this reponse header:

    curl -s -D - -o /dev/null -b lemonldap=0640f95827111f00ba7ad5863ba819fe46cfbcecdb18ce525836369fb4c8350b 'https://oidctest.wsweet.org/oauth2/authorize?response_type=code&client_id=private&scope=openid+profile+email&redirect_uri=http://localhost' | grep '^location'

The value of the location header is:

    location: http://localhost?code=294b0facd91a0fa92762edc48d18369e99c330ba2b8fb05ab2c45999fcef6e17&session_state=BpB8KRMBEDUs%2B7lAjsz4DRk3E0RJImxgUbMsCFFAUa8%3D.N3dVOFg3a2RpNXVJK3ltSldrYXZjUjhtU0tvd29sWkpuWWJJbll5ZGs5NzhZMnh5bmQwd0IxRmJVWUxJSTlkWDBnSWZ2SWFVZmU0UnRaMkVJVjNUY3c9PQ

So we get the code value: 94b0facd91a0fa92762edc48d18369e99c330ba2b8fb05ab2c45999fcef6e17

This code has a short lifetime, we will use it to get access token and ID token in the next step

## Tokens

In this step, we exchange the authorization code against tokens:

  - Access token

  - ID token

  - Refresh token (optional)

Parameters needed:

  - Authorization code: see previous step

  - Grant type: we use here authorization_code

  - Redirect URI: same value as the one used in the previous step

  - Client ID and Client Secret: given by your OIDC provider, we use here private/tardis

    curl -X POST -d grant_type=authorization_code -d 'redirect_uri=http://localhost' -d code=94b0facd91a0fa92762edc48d18369e99c330ba2b8fb05ab2c45999fcef6e17 -u 'private:tardis' 'https://oidctest.wsweet.org/oauth2/token' | json_pp

The JSON response looks like this:

    {
     "access_token" : "a88b8dde538719e55c3cb8fbd14d06ed77853c685a62abf6ecb88d86228a9c64",
     "expires_in" : 3600,
     "id_token" : "eyJhbGciOiJSUzI1NiIsImtpZCI6Im9pZGN0ZXN0IiwidHlwIjoiSldUIn0.eyJhdXRoX3RpbWUiOjE2MTQxNjAwMDYsImlhdCI6MTYxNDE2MzIxOCwiaXNzIjoiaHR0cHM6Ly9vaWRjdGVzdC53c3dlZXQub3JnLyIsImF0X2hhc2giOiJIVGswOVNjSjRObEFua3k5SGFFX2VRIiwiYWNyIjoibG9hLTIiLCJleHAiOjE2MTQxNjY4MTgsInN1YiI6ImR3aG8iLCJhenAiOiJwcml2YXRlIiwiYXVkIjpbInByaXZhdGUiXX0. ",
     "refresh_token" : "19434440ed4da2803e8ba9d91cb2eabd5b8bd12af2609429bda03ed487e6ef57",
     "token_type" : "Bearer"
    }

The access token will be used for the last step, to get information about the user.

The ID Token is a JWT (JSON Web Token) and can be parsed easily, as this is the concatenation of 3 JSON strings encoded in base 64: base64(header).base64(payload).base64(signature).

Decoding the payload gives:

    {
     "acr" : "loa-2",
     "at_hash" : "HTk09ScJ4NlAnky9HaE_eQ",
     "aud" : [
       "private"
     ],
     "auth_time" : 1614160006,
     "azp" : "private",
     "exp" : 1614166818,
     "iat" : 1614163218,
     "iss" : "https://oidctest.wsweet.org/",
     "sub" : "dwho"
    }

## User info

This step is optional and allows to fetch user information linked to scopes requested in the first step.

Parameters needed:

  - Access token, used as bearer authorization

    curl -H 'Authorization: Bearer a88b8dde538719e55c3cb8fbd14d06ed77853c685a62abf6ecb88d86228a9c64' 'https://oidctest.wsweet.org/oauth2/userinfo' | json_pp

JSON response:

    {
     "email" : "dwho@badwolf.org",
     "name" : "Doctor Who",
     "preferred_username" : "dwho",
     "sub" : "dwho"
    }