Fix Broken User Authentication in Pyramid
Broken authentication in Pyramid typically arises from legacy AuthTktAuthenticationPolicy usage with insecure defaults, weak password hashing, or lack of secure cookie flags. Exploiting these leads to session hijacking and credential harvesting. We must transition to the modern SecurityPolicy interface and enforce cryptographic hardening.
The Vulnerable Pattern
from pyramid.authentication import AuthTktAuthenticationPolicy from pyramid.authorization import ACLAuthorizationPolicyINSECURE: Using deprecated policy with weak settings
authn_policy = AuthTktAuthenticationPolicy( secret=‘super_secret_key’, callback=groupfinder, hashalg=‘sha1’ # WEAK: SHA1 is deprecated )
INSECURE: Simple plaintext password check
def login_view(request): username = request.params.get(‘login’) password = request.params.get(‘password’) user = User.get_by_username(username) if user and user.password == password: # VULNERABLE: Plaintext comparison headers = remember(request, user.id) return HTTPFound(location=‘/dashboard’, headers=headers)
The Secure Implementation
The secure implementation replaces the deprecated AuthTktAuthenticationPolicy with a custom SecurityPolicy using AuthTktCookieHelper. Critical upgrades include: 1. Switching from plaintext/SHA1 to Argon2id for password hashing to prevent brute-forcing. 2. Setting 'secure=True' and 'httponly=True' flags to mitigate MITM and XSS session theft. 3. Implementing 'samesite=Lax' to provide defense-in-depth against CSRF. 4. Using SHA-512 for the cookie's internal HMAC to ensure integrity against tampering.
from pyramid.authentication import AuthTktCookieHelper from pyramid.security import SecurityPolicy from argon2 import PasswordHasherph = PasswordHasher()
class MySecurityPolicy: def init(self, secret): self.helper = AuthTktCookieHelper( secret=secret, hashalg=‘sha512’, samesite=‘Lax’, secure=True, # Only send over HTTPS httponly=True, # Prevent XSS access to cookie max_age=3600 )
def identity(self, request): return self.helper.identify(request) def remember(self, request, userid, **kw): return self.helper.remember(request, userid, **kw) def forget(self, request, **kw): return self.helper.forget(request, **kw)
def login_view(request): username = request.params.get(‘login’) password = request.params.get(‘password’) user = User.get_by_username(username) try: # SECURE: Argon2id password verification if user and ph.verify(user.password_hash, password): headers = request.security_policy.remember(request, user.id) return HTTPFound(location=‘/dashboard’, headers=headers) except Exception: pass return {‘error’: ‘Invalid credentials’}
Your Pyramid API
might be exposed to Broken User Authentication
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