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Auth & security at scale

OAuth2, JWT, IAM patterns, secrets rotation, and least-privilege service auth.

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How to Create Secure Session Cookies in Python with Secure, HttpOnly, and SameSite Flags

This code demonstrates how to create a secure session cookie using Python's stdlib, setting Secure, HttpOnly, and SameSite attributes to protect against common web vulnerabilities.

cookies session security

Python

import http.cookies
import secrets

class SessionManager:
    def __init__(self):
        self.cookie = http.cookies.SimpleCookie()

    def create_session_cookie(self, session_id=None):
        session_id = session_id or secrets.token_hex(16)
        self.cookie["session"] = session_id
        self.cookie["session"][…

14 0 Open

Auth & security at scale easy

How to Generate and Verify HMAC Signatures in Python

Create and validate HMAC-SHA256 signatures with a shared secret key using Python's hmac and hashlib modules.

hmac security cryptography

Python

import hashlib
import hmac

SECRET_KEY = b"pepper-secret-2024"

def generate_hmac(message: str) -> str:
    return hmac.new(SECRET_KEY, message.encode("utf-8"), hashlib.sha256).hexdigest()

def verify_hmac(message: str, received_hmac: str) -> bool:
    expected = generate_hmac(message)
    return hmac.compare_digest(e…

15 0 Open

Auth & security at scale easy

How to Hash Passwords Securely in Python

Hash passwords with PBKDF2, random salts, and constant pepper, plus generate secure API keys using Python's stdlib.

password hashing security

Python

import hashlib
import secrets
import time
import hmac


def hash_password(password: str, salt: str = None, pepper: str = "static-pepper") -> dict:
    """Hash a password with a random salt and constant pepper."""
    if salt is None:
        salt = secrets.token_hex(16)
    salted = f"{pepper}{salt}{password}"
    dig…

15 0 Open

Auth & security at scale easy

How to Implement an HSTS Preload List Mock in Python

Implements a mock HSTS preload list in Python that supports adding, removing, checking domains with subdomain inheritance, and listing domains.

hsts security domains

Python

import json

class HSTSPreloadList:
    def __init__(self):
        self.domains = {}

    def add_domain(self, domain, include_subdomains=False, max_age=31536000):
        self.domains[domain] = {
            "include_subdomains": include_subdomains,
            "max_age": max_age
        }

    def remove_domain(sel…

15 0 Open

Auth & security at scale easy

How to Set a SameSite Cookie in Python

Set a SameSite cookie attribute in Python using the standard library's SimpleCookie class.

cookies samesite http

Python

from http.cookies import SimpleCookie

def set_same_site_cookie(name, value, same_site="Lax"):
    cookie = SimpleCookie()
    cookie[name] = value
    cookie[name]["path"] = "/"
    cookie[name]["samesite"] = same_site
    return cookie[name].OutputString()

if __name__ == "__main__":
    print(set_same_site_cookie("…

12 0 Open

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