Fix Broken User Authentication in Rocket
Broken Authentication is a critical vulnerability where an attacker compromises passwords, keys, or session tokens to assume user identities. In Rocket, this usually manifests through plaintext password storage, weak session management using standard cookies, or failing to implement proper Request Guards. We're going to kill those vectors using Argon2 and PrivateCookies.
The Vulnerable Pattern
#[post("/login", data = "")]
fn login(cookies: &CookieJar<'_>, auth: Form) -> Redirect {
let user = db::get_user(&auth.username);
// CRITICAL VULNERABILITY: Plaintext comparison and insecure cookie
if user.password == auth.password {
cookies.add(Cookie::new("user_id", user.id.to_string()));
Redirect::to("/dashboard")
} else {
Redirect::to("/login")
}
} The Secure Implementation
The fix implements two major security controls. First, it replaces plaintext password checks with Argon2id, a memory-hard password hashing function that resists GPU/ASIC cracking. Second, it switches from `cookies.add()` to `cookies.add_private()`. In Rocket, `add_private` utilizes the `secret_key` defined in your Rocket.toml to provide Authenticated Encryption with Associated Data (AEAD). This prevents clients from viewing or tampering with the session data, effectively mitigating session hijacking and privilege escalation via cookie manipulation.
use argon2::{password_hash::{PasswordHash, PasswordVerifier}, Argon2};#[post(“/login”, data = "
")] async fn login(cookies: &CookieJar<’>, auth: Form ) -> Result<Redirect, Status> { let user = db::get_user(&auth.username).await.map_err(| | Status::Unauthorized)?;// SECURE: Verify hash using Argon2id let expected_hash = PasswordHash::new(&user.password_hash).map_err(|_| Status::InternalServerError)?; if Argon2::default().verify_password(auth.password.as_bytes(), &expected_hash).is_ok() { // SECURE: add_private uses authenticated encryption (AEAD) to prevent tampering cookies.add_private(Cookie::new("user_id", user.id.to_string())); Ok(Redirect::to("/dashboard")) } else { Err(Status::Unauthorized) }
}
Your Rocket API
might be exposed to Broken User Authentication
74% of Rocket apps fail this check. Hackers use automated scanners to find this specific flaw. Check your codebase before they do.
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