Zitadel logout return a 404

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Summary

The issue at hand is a 404 error encountered during the logout process using Zitadel SSO. The logout method is implemented using FastAPI, and the error is believed to be related to the ID token or logout token becoming invalid on the Zitadel side during logout.

Root Cause

The root cause of the issue can be attributed to the following:

  • Invalid or expired ID token: The ID token used in the logout request may be invalid or expired, causing Zitadel to return a 404 error.
  • Incorrect post-logout redirect URI: The post-logout redirect URI may not be correctly configured, leading to a 404 error.
  • Zitadel configuration issues: There may be configuration issues on the Zitadel side, such as incorrect tenant settings or invalid client IDs.

Why This Happens in Real Systems

This issue can occur in real systems due to:

  • Token expiration: ID tokens have a limited lifetime and can expire, causing issues during logout.
  • Incorrect implementation: Incorrect implementation of the logout method or post-logout redirect URI can lead to errors.
  • Configuration mistakes: Mistakes in configuring Zitadel or the client application can cause issues during logout.

Real-World Impact

The real-world impact of this issue includes:

  • User frustration: Users may experience frustration when encountering a 404 error during logout.
  • Security concerns: Invalid or expired ID tokens can pose security risks if not handled properly.
  • System downtime: Repeated errors can lead to system downtime, affecting user productivity and business operations.

Example or Code

from fastapi import Request, RedirectResponse

@app.get("/logout")
async def logout(request: Request):
    id_token = request.session.get("id_token")
    if not id_token:
        request.session.clear()
        return RedirectResponse("/login")
    zitadel_logout = (
        "https://metasolutionlab-tenant-sso-koexbj.us1.zitadel.cloud/oauth/v2/logout"
        f"?id_token_hint={id_token}"
        f"&post_logout_redirect_uri=https://admin.sendnconnect.com/post-logout"
    )
    return RedirectResponse(zitadel_logout)

@app.get("/post-logout")
async def post_logout(request: Request):
    request.session.clear()
    return RedirectResponse("/login")

How Senior Engineers Fix It

Senior engineers can fix this issue by:

  • Verifying ID token validity: Ensuring that the ID token is valid and not expired before using it in the logout request.
  • Checking post-logout redirect URI: Verifying that the post-logout redirect URI is correctly configured and matches the expected value.
  • Reviewing Zitadel configuration: Reviewing the Zitadel configuration to ensure that it is correct and matches the client application settings.

Why Juniors Miss It

Junior engineers may miss this issue due to:

  • Lack of experience: Limited experience with SSO and token-based authentication can lead to mistakes in implementation.
  • Insufficient testing: Inadequate testing of the logout process can fail to reveal issues with ID token validity or post-logout redirect URI.
  • Incomplete understanding of Zitadel configuration: Limited understanding of Zitadel configuration and client application settings can lead to mistakes in configuration.

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