http-signatures 0.1.3

An implementation of the HTTP Signatures RFC

HTTP Signatures

This crate is used to create and verify HTTP Signatures, defined here. It has support for Hyper, Rocket, and Reqwest types. In the future, I might also support Iron middleware for verification.

crates.io documentation

Running the examples

Since this crate is built to modularly require dependencies, running the examples is not as straightforward as for other projects. To run hyper_server and hyper_client, the proper commands are

cargo run --example hyper_server --features use_hyper

and

cargo run --example hyper_client --features use_hyper

The hyper examples are configured to talk to eachother by default. The server runs on port 3000, and the client POSTs on port 3000. They also use the Signature header to sign and verify the request. The rocket server

cargo run --example rocket --features use_rocket

runs on port 8000, and the reqwest client

cargo run --example reqwest --features use_reqwest

GETs on port 8000. These examples use the Authorization header to sign and verify the request.

Usage

With Hyper

Add this to your Cargo.toml

[dependencies.http-signatures]
version = "0.1"
default-features = false
features = ["use_hyper"]
Client

Use it when building a request as follows.

let key_id = "some-username-or-something";
let private_key = File::open("test/assets/private.der").unwrap();

let mut core = Core::new().unwrap();
let client = Client::new(&core.handle());

let json = r#"{"library":"hyper"}"#;
let mut req = Request::new(Method::Post, "http://localhost:3000".parse().unwrap());
req.headers_mut().set(ContentType::json());
req.headers_mut().set(ContentLength(json.len() as u64));
req.set_body(json);

// Add the HTTP Signature
req.with_authorization_header(
    key_id.into(),
    private_key,
    SignatureAlgorithm::RSA(ShaSize::FiveTwelve),
).unwrap();

let post = client.request(req).and_then(|res| {
    println!("POST: {}", res.status());

    res.body().concat2()
});

core.run(post).unwrap();
Server

This is a very basic example server outline that should give you a general idea of how to set up a Hyper server that verifies HTTP Signatures. This is not meant to be code that actually works.

#[derive(Clone)]
struct MyKeyGetter {
    key: Vec<u8>,
}

impl MyKeyGetter {
    fn new(filename: &str) -> Result<Self, ..> {
        let mut key = Vec::new();
        std::fs::File::open(filename)
            .map_err(|_| ..)?
            .read_to_end(&mut key)
            .map_err(|_| ..)?;

        Ok(MyKeyGetter { key })
    }
}

impl GetKey for MyKeyGetter {
    type Key = Cursor<Vec<u8>>;
    type Error = ..;

    fn get_key(self, _key_id: &str) -> Result<Self::Key, ..> {
        Ok(Cursor::new(self.key.clone()))
    }
}

struct HelloWorld {
    key_getter: MyKeyGetter,
}

impl HelloWorld {
    fn new(filename: &str) -> Result<Self, ..> {
        Ok(HelloWorld { key_getter: MyKeyGetter::new(filename)? })
    }
}

const PHRASE: &'static str = "Hewwo, Mr. Obama???";

impl Service for HelloWorld {
    ...

    fn call(&self, req: Request) -> Self::Future {
        let verified = req.verify_authorization_header(self.key_getter.clone())
            .map_err(|_| hyper::Error::Header);

        Box::new(verified.into_future().and_then(|_| {
            println!("Succesfully verified request!");
            Ok(
                Response::new()
                    .with_header(ContentLength(PHRASE.len() as u64))
                    .with_body(PHRASE),
            )
        }))
    }
}

fn main() {
    let addr = "127.0.0.1:3000".parse().unwrap();
    let server = Http::new()
        .bind(&addr, || {
            Ok(HelloWorld::new("test/assets/public.der").unwrap())
        })
        .unwrap();
    server.run().unwrap();
}

With Reqwest

Add this to your Cargo.toml

[dependencies.http-signatures]
version = "0.1"
default-features = false
features = ["use_reqwest"]

In your code, use it when building a request as follows.

let key_id = "some-username-or-something".into();
let private_key = File::open("test/assets/private.der").unwrap();

let client = Client::new();
let mut req = client
    .post("http://localhost:3000")
    .body("Some Body")
    .build()
    .unwrap();

req.with_authorization_header(
    key_id,
    private_key,
    SignatureAlgorithm::RSA(ShaSize::FiveTwelve),
).unwrap();

client.execute(req).unwrap();

With Rocket

Add this to your Cargo.toml

[dependencies.http-signatures]
version = "0.1"
default-features = false
features = ["use_rocket"]

In your code, use it in a route like so

#[derive(Clone)]
struct MyKeyGetter {
    key: Vec<u8>,
}

impl MyKeyGetter {
    fn new(filename: &str) -> Result<Self, Error> {
        let mut key = Vec::new();
        std::fs::File::open(filename)
            .map_err(|_| ..)?
            .read_to_end(&mut key)
            .map_err(|_| ..)?;

        Ok(MyKeyGetter { key })
    }
}

impl GetKey for MyKeyGetter {
    type Key = Cursor<Vec<u8>>;
    type Error = ..;

    fn get_key(self, _key_id: &str) -> Result<Self::Key, Self::Error> {
        Ok(Cursor::new(self.key.clone()))
    }
}

struct Verified;

impl<'a, 'r> FromRequest<'a, 'r> for Verified {
    type Error = ();

    fn from_request(request: &'a Request<'r>) -> Outcome<Verified, ()> {
        let res = request
            .guard::<State<MyKeyGetter>>()
            .succeeded()
            .ok_or(())
            .and_then(|key_getter| {
                request
                    .verify_authorization_header(key_getter.clone())
                    .map_err(|_| ..)?;

                Ok(Verified)
            });

        match res {
            Ok(verified) => Success(verified),
            Err(fail) => Failure((Status::Forbidden, fail)),
        }
    }
}

#[get("/")]
fn index(_verified: Verified) -> &'static str {
    "Successfully verified request"
}

fn main() {
    let key_getter = MyKeyGetter::new("test/assets/public.der").unwrap();

    rocket::ignite()
        .mount("/", routes![index])
        .manage(key_getter)
        .launch();
}

Contributing

Please be aware that all code contributed to this project will be licensed under the GPL version 3.

License

HTTP Signatures is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, either version 3 of the License, or (at your option) any later version.

HTTP Signatures is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. This file is part of HTTP Signatures

You should have received a copy of the GNU General Public License along with HTTP Signatures If not, see http://www.gnu.org/licenses/.