62 lines
2 KiB
Markdown
62 lines
2 KiB
Markdown
alcoholic_jwt
|
|
=============
|
|
|
|
[](https://travis-ci.org/aprilabank/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`.
|
|
|
|
[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
|