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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][]:
```rust
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`.
## Contributing
This project is developed in the [TVL monorepo][depot]. To work on it,
you can either use a local clone of the entire repository or clone
just the `alcoholic_jwt` subtree:
https://code.tvl.fyi/depot.git:/net/alcoholic_jwt.git
Please follow the TVL [contribution guidelines][contributing].
[Google]: https://www.google.com/
[Aprila]: https://www.aprila.no/
[JWKS]: https://tools.ietf.org/html/rfc7517
[`kid` claim]: https://tools.ietf.org/html/rfc7515#section-4.1.4
[depot]: https://code.tvl.fyi/
[contributing]: https://code.tvl.fyi/about/docs/CONTRIBUTING.md
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