Fix Broken User Authentication in Django
Broken Authentication in Django typically manifests through manual session handling, weak password hashing, or lack of rate-limiting. If you aren't using Django's built-in auth primitives and session rotation, you're leaving the door open for session fixation and brute-force attacks. This guide hardens the authentication flow.
The Vulnerable Pattern
def manual_login(request):
# VULNERABLE: Plaintext comparison, no session rotation, no rate limiting
user = User.objects.get(username=request.POST['username'])
if user.password == request.POST['password']:
request.session['user_id'] = user.id
return HttpResponse('Logged in')
return HttpResponse('Fail')The Secure Implementation
The vulnerable code bypasses Django's security middleware. It performs a plaintext password comparison (vulnerable to leak/theft) and fails to rotate the session ID, allowing session fixation. The secure version leverages 'authenticate()' for secure hash verification, 'login()' for proper session management, and 'cycle_key()' to ensure the session ID changes post-auth. Additionally, the 'axes_dispatch' decorator is used to block brute-force attempts after multiple failed logins.
from django.contrib.auth import authenticate, login from django.views.decorators.http import require_POST from axes.decorators import axes_dispatch
@axes_dispatch @require_POST def secure_login(request): # SECURE: Uses constant-time hashing, session rotation, and rate limiting username = request.POST.get(‘username’) password = request.POST.get(‘password’) user = authenticate(request, username=username, password=password) if user is not None: login(request, user) request.session.cycle_key() # Mitigate Session Fixation return JsonResponse({‘status’: ‘authenticated’}) return JsonResponse({‘error’: ‘Invalid credentials’}, status=401)
Your Django API
might be exposed to Broken User Authentication
74% of Django apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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