alcoholic_jwt
This is a library for validation of RS256 JWTs using keys from a JWKS. Nothing more, nothing less.
RS256 is the most commonly used asymmetric signature mechanism for JWTs, encountered in for example Google's or Aprila's APIs.
The name of the library stems from the potential side-effects of trying to use the other Rust libraries that are made for similar purposes.
Usage overview
You are retrieving JWTs from some authentication provider that uses
RS256 signatures and provides its public keys in JWKS format.
Example for a token that provides the key ID used for signing in the
kid claim:
extern crate alcoholic_jwt;
use alcoholic_jwt::{JWKS, Validation, validate, token_kid};
// The function implied here would usually perform an HTTP-GET
// on the JWKS-URL for an authentication provider and deserialize
// the result into the `alcoholic_jwt::JWKS`-struct.
let jwks: JWKS = jwks_fetching_function();
let token: String = some_token_fetching_function();
// Several types of built-in validations are provided:
let validations = vec![
Validation::Issuer("auth.test.aprila.no".into()),
Validation::SubjectPresent,
];
// If a JWKS contains multiple keys, the correct KID first
// needs to be fetched from the token headers.
let kid = token_kid(&token)
.expect("Failed to decode token headers")
.expect("No 'kid' claim present in token");
let jwk = jwks.find(&kid).expect("Specified key not found in set");
validate(token, jwk, validations).expect("Token validation has failed!");Under the hood
This library aims to only use trustworthy off-the-shelf components to
do the work. Cryptographic operations are provided by the openssl
crate, JSON-serialisation is provided by serde_json.