# Use "Authorisation Code Flow" for Authentication

## Tags

* assigned: fredm
* priority: critical
* status: open
* keywords: authentication, authorisation, oauth2, authorisation code flow
* type: feature request, improvement

## Description

We use OAuth2 for our auth(entic|oris)ation system.

Currently, the system is making use of the "Password Grant Flow"[0] which was easy to implement and use for verifying concepts during development, but is not recommended for actual web applications. This is because, the "Password Grant Flow"[0] is meant for highly-trusted applications.

Instead, the OAuth2 specification recommends the use of the "Authorisation Code Flow"[1] (possibly with PKCE[2]) for web and mobile applications.

With the "Authorisation Code Flow"[1] in place, we will also have the ability to reuse the auth(entic|oris)ation system for other applications, e.g. the QC App

## Links

=> https://oauth.net/2/grant-types/password/ 0
=> https://oauth.net/2/grant-types/authorization-code/ 1
=> https://www.oauth.com/oauth2-servers/pkce/ 2