63 lines
2 KiB
Markdown
63 lines
2 KiB
Markdown
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alcoholic_jwt
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=============
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[](https://travis-ci.org/aprilabank/alcoholic_jwt)
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This is a library for **validation** of **RS256** JWTs using keys from
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a JWKS. Nothing more, nothing less.
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RS256 is the most commonly used asymmetric signature mechanism for
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JWTs, encountered in for example [Google][]'s or [Aprila][]'s APIs.
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The name of the library stems from the potential side-effects of
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trying to use the other Rust libraries that are made for similar
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purposes.
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## Usage overview
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You are retrieving JWTs from some authentication provider that uses
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`RS256` signatures and provides its public keys in [JWKS][] format.
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Example for a token that provides the key ID used for signing in the
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[`kid` claim][]:
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```rust
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extern crate alcoholic_jwt;
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use alcoholic_jwt::{JWKS, Validation, validate, token_kid};
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// The function implied here would usually perform an HTTP-GET
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// on the JWKS-URL for an authentication provider and deserialize
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// the result into the `alcoholic_jwt::JWKS`-struct.
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let jwks: JWKS = jwks_fetching_function();
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let token: String = some_token_fetching_function();
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// Several types of built-in validations are provided:
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let validations = vec![
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Validation::Issuer("auth.test.aprila.no".into()),
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Validation::SubjectPresent,
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];
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// If a JWKS contains multiple keys, the correct KID first
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// needs to be fetched from the token headers.
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let kid = token_kid(&token)
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.expect("Failed to decode token headers")
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.expect("No 'kid' claim present in token");
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let jwk = jwks.find(&kid).expect("Specified key not found in set");
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validate(token, jwk, validations).expect("Token validation has failed!");
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```
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## Under the hood
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This library aims to only use trustworthy off-the-shelf components to
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do the work. Cryptographic operations are provided by the `openssl`
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crate, JSON-serialisation is provided by `serde_json`.
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[Google]: https://www.google.com/
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[Aprila]: https://www.aprila.no/
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[JWKS]: https://tools.ietf.org/html/rfc7517
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[`kid` claim]: https://tools.ietf.org/html/rfc7515#section-4.1.4
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