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A comprehensive guide to fixing configuration errors with Duende IdentityServer 6 in a Docker environment, focusing on cookie handling and securing connections.
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Resolving the Error Configuring Duende IdentityServer 6 with Docker

If you're venturing into the world of containerized applications, you may encounter various configuration challenges, especially when you're dealing with authentication systems like Duende IdentityServer 6. Recently, a prevalent issue has come to light regarding the setup of Duende IdentityServer in a Docker environment, particularly when integrating with client applications. In this post, we will dissect this problem and provide effective solutions to rectify it.

Identifying the Problem

The main issue revolves around an error message that pops up when attempting to log in from a client application using Duende IdentityServer as an Identity Provider (IdP). Users report this error primarily when:

A Duende IdentityServer 6 container is set up (acting as the IdP).

A React client application is implemented using a Backend for Frontend (BFF) pattern.

The error points towards a conflict with cookie policies, specifying that the cookie properties need adjustment to facilitate smoother interactions in a Dockerized setup.

Typical Scenario

In a common application architecture, you might set up your environment as follows:

IdP Service:

This container facilitates user authentication.

Configured to handle requests and responses.

Client Service:

This service interacts with users, implementing login functionalities.

Users reported errors even when their configuration files specified direct interaction through HTTP, only to be met with restrictive cookie policies that hinder successful communication.

Understanding the Error Logs

When users try to sign in, they receive warning messages in the logs indicating issues like:

[[See Video to Reveal this Text or Code Snippet]]

This warning signifies that the cookies being used for authentication are not properly configured in terms of their SameSite attribute, which impacts their security and functionality.

Proposed Solutions

Here are detailed adjustments you can make to rectify the errors encountered:

1. Adjust Cookie SameSite Mode

To ensure proper cookie transmission, you need to modify the cookie policy in your client application's configuration:

Modify the Client Application Configuration

Update the configuration as follows in program.cs:

[[See Video to Reveal this Text or Code Snippet]]

Explanation:

Lax mode allows the cookie to be sent with top-level navigations and when following link navigation, providing a balance between security and usability.

2. Enable HTTPS

While developing locally and even in production, using HTTP for authentication could invite potential vulnerabilities. Here’s what you should enforce:

Use HTTPS: You must configure your application to use HTTPS rather than HTTP. Authentication workflows, especially OpenID Connect (OIDC), require secure channels to manage tokens and user sessions effectively.

Steps to Enable HTTPS in Docker

Modify your Dockerfile to redirect HTTP to HTTPS.

Use a reverse proxy (like Nginx) configured for TLS termination if necessary.

Sample Docker Compose Configuration

Here's how your Docker Compose file might look after applying these changes:

[[See Video to Reveal this Text or Code Snippet]]

Final Thoughts

Configuring Duende IdentityServer 6 with Docker can be a formidable task, especially when dealing with cookie policies and secure communications. However, by implementing the adjustments outlined above, such as modifying the SameSite attribute and enforcing HTTPS, you can effectively eliminate the authentication errors and set your application on a path to success.

Test your application thoroughly and ensure all configurations align with best practices for security and performance