Broken authentication in Hug typically occurs when developers bypass the built-in authentication middleware in favor of manual, insecure credential checks. This often leads to vulnerabilities like plaintext password storage, lack of rate limiting, and credential leakage via URL parameters. To fix this, you must implement Hug's native authentication directives combined with industry-standard hashing algorithms like Argon2.

The Vulnerable Pattern

import hug
VULNERABLE: Credentials passed as query params, plaintext comparison, no middleware
@hug.get(‘/admin/data’)
def get_sensitive_info(user, password):
if user == ‘admin’ and password == ‘P@ssword123’:
return {‘status’: ‘authenticated’, ‘data’: ‘secret_val’}
return {‘error’: ‘Unauthorized’}

The Secure Implementation

The vulnerable code exposes credentials in server logs via GET parameters and performs a constant-time plaintext comparison, which is susceptible to timing attacks and data breaches. The secure implementation utilizes Hug's 'authentication.basic' middleware, which expects credentials in the Authorization header. It also employs Argon2id, a memory-hard Key Derivation Function (KDF), to verify passwords, ensuring that even if the database is leaked, the raw passwords remain computationally expensive to crack.

import hug
from argon2 import PasswordHasher
from argon2.exceptions import VerifyMismatchError
ph = PasswordHasher()
Mock database record
USER_DB = {‘admin’: ‘$argon2id$v=19$m=65536,t=3,p=4$7P8…’}
def verify_credentials(username, password):
hashed = USER_DB.get(username)
if not hashed:
return False
try:
ph.verify(hashed, password)
return username
except VerifyMismatchError:
return False
SECURE: Use Hug’s basic authentication middleware
auth = hug.authentication.basic(verify_credentials)
@hug.get(‘/admin/data’, requires=auth)
def get_sensitive_info(user: hug.directives.user):
return {‘status’: ‘authenticated’, ‘data’: ‘secret_val’, ‘accessed_by’: user}