Authorization and Authentication in Rust: Libraries and Practical Examples

Authorization and Authentication in Rust: From JWT to Sessions

In the world of systems and web programming, Rust has earned a reputation as a safe and fast language. However, when creating web applications, developers often face the task of implementing authentication (verifying user identity) and authorization (checking access rights). In this article, we will look at key libraries and approaches for implementing these mechanisms in Rust, and also provide practical code examples.

Basic Concepts of Authentication and Authorization

Before moving on to the tools, it is important to distinguish between the concepts:

• Authentication — the process of verifying that a user is who they claim to be. Usually done using a login/password, tokens, or biometrics.
• Authorization — determining which resources and actions are available to an authenticated user. Often implemented through roles (administrator, moderator, user) or access rights.

In Rust, both processes can be implemented both at a low level (manual token management) and using ready-made libraries.

Popular Libraries for Authentication in Rust

For working with sessions and tokens in Rust, there are several mature solutions:

• actix-identity — for session management in the Actix-web web framework. Supports cookie sessions and Redis.
• jsonwebtoken — a library for working with JWT (JSON Web Tokens). Allows you to create, sign, and verify tokens.
• argon2 — an implementation of the Argon2 password hashing algorithm, recommended by OWASP.
• bcrypt — a classic library for password hashing.

Below we will look at each tool with an example.

Example 1: Authentication with JWT and jsonwebtoken

JWT is one of the most popular authentication methods for REST APIs. The token contains claims and is signed with a secret key. Let's look at a basic implementation using the jsonwebtoken library.

// cargo add jsonwebtoken serdeuse jsonwebtoken::{encode, decode, Header, Validation, EncodingKey, DecodingKey};use serde::{Serialize, Deserialize};

#[derive(Debug, Serialize, Deserialize)]struct Claims {    sub: String,   // user identifier    exp: usize,    // expiration time (UNIX timestamp)    role: String,  // user role}

fn create_token(user_id: &str, role: &str) -> Result<String, jsonwebtoken::errors::Error> {    let claims = Claims {        sub: user_id.to_owned(),        exp: (chrono::Utc::now() + chrono::Duration::hours(24)).timestamp() as usize,        role: role.to_owned(),    };    encode(        &Header::default(),        &claims,        &EncodingKey::from_secret(b"your_secret_key")    )}

fn verify_token(token: &str) -> Result<Claims, jsonwebtoken::errors::Error> {    let token_data = decode::<Claims>(        token,        &DecodingKey::from_secret(b"your_secret_key"),        &Validation::default()    )?;    Ok(token_data.claims)}

In this example, we create a token for 24 hours containing the user ID and their role. The verify_token function checks the signature and returns the claims, which can be used for authorization.

Example 2: Password Hashing with Argon2

Never store passwords in plain text! Use Argon2 — a modern and secure hashing algorithm.

// cargo add argon2use argon2::{Argon2, PasswordHash, PasswordHasher, PasswordVerifier};use argon2::password_hash::{SaltString, rand_core::OsRng};

fn hash_password(password: &str) -> String {    let salt = SaltString::generate(&mut OsRng);    let argon2 = Argon2::default();    argon2.hash_password(password.as_bytes(), &salt)        .expect("Hashing error")