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54
README.md
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@ -1,2 +1,56 @@
# HTTP Signature Normaliztion
_An HTTP Signatures library that leaves the signing to you_
- [crates.io](https://crates.io/crates/http-signature-normalization)
- [docs.rs](https://docs.rs/http-signature-normalization)
- [Join the discussion on Matrix](https://matrix.to/#/!IRQaBCMWKbpBWKjQgx:asonix.dog?via=asonix.dog)
Http Signature Normalization is a minimal-dependency crate for producing HTTP Signatures with user-provided signing and verification. The API is simple; there's a series of steps for creation and verification with types that ensure reasonable usage.
```rust
use chrono::Duration;
use http_signature_normalization::Config;
fn main() -> Result<(), Box<dyn std::error::Error>> {
let config = Config {
expires_after: Duation::secs(5),
};
let headers = BTreeMap::new();
let signature_header_value = config
.begin_sign("GET", "/foo?bar=baz", headers)
.sign("my-key-id".to_owned(), |signing_string| {
// sign the string here
Ok(signing_string.to_owned()) as Result<_, Box<dyn std::error::Error>>
})?
.signature_header();
let mut headers = BTreeMap::new();
headers.insert("Signature".to_owned(), signature_header_value);
let verified = config
.begin_verify("GET", "/foo?bar=baz", headers)?
.verify(|sig, signing_string| {
// Verify the signature here
sig == signing_string
});
assert!(verified)
}
```
### Contributing
Unless otherwise stated, all contributions to this project will be licensed under the CSL with
the exceptions listed in the License section of this file.
### License
This work is licensed under the Cooperative Software License. This is not a Free Software
License, but may be considered a "source-available License." For most hobbyists, self-employed
developers, worker-owned companies, and cooperatives, this software can be used in most
projects so long as this software is distributed under the terms of the CSL. For more
information, see the provided LICENSE file. If none exists, the license can be found online
[here](https://lynnesbian.space/csl/). If you are a free software project and wish to use this
software under the terms of the GNU Affero General Public License, please contact me at
[asonix@asonix.dog](mailto:asonix@asonix.dog) and we can sort that out. If you wish to use this
project under any other license, especially in proprietary software, the answer is likely no.

6
http-signature-normalization-actix/Cargo.toml
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@ -3,13 +3,13 @@ name = "http-signature-normalization-actix"
description = "An HTTP Signatures library that leaves the signing to you"
version = "0.1.0"
authors = ["asonix <asonix@asonix.dog>"]
license-file = "../LICENSE"
readme = "../README.md"
license-file = "LICENSE"
readme = "README.md"
edition = "2018"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[features]
default = []
default = ["sha-2", "sha-3"]
digest = ["base64"]
sha-2 = ["digest", "sha2"]
sha-3 = ["digest", "sha3"]

417
http-signature-normalization-actix/LICENSE Normal file
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@ -0,0 +1,417 @@
Http Signature Normalization
Copyright Riley Trautman 2019
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191
http-signature-normalization-actix/README.md Normal file
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@ -0,0 +1,191 @@
# HTTP Signature Normaliztion Actix
_An HTTP Signatures library that leaves the signing to you_
- [crates.io](https://crates.io/crates/http-signature-normalization-actix)
- [docs.rs](https://docs.rs/http-signature-normalization-actix)
- [Join the discussion on Matrix](https://matrix.to/#/!IRQaBCMWKbpBWKjQgx:asonix.dog?via=asonix.dog)
Http Signature Normalization is a minimal-dependency crate for producing HTTP Signatures with user-provided signing and verification. The API is simple; there's a series of steps for creation and verification with types that ensure reasonable usage.
## Usage
This crate provides extensions the ClientRequest type from Actix Web, and provides middlewares for verifying HTTP Signatures, and optionally, Digest headers
#### First, add this crate to your dependencies
```toml
actix = "0.8"
actix-web = "1.0"
failure = "0.1"
http-signature-normalization-actix = { version = "0.1", default-features = false, features = ["sha2"] }
sha2 = "0.8"
```
#### Then, use it in your client
```rust
use actix::System;
use actix_web::client::Client;
use failure::Fail;
use futures::future::{lazy, Future};
use http_signature_normalization_actix::prelude::*;
use sha2::{Digest, Sha256};
fn main() {
System::new("client-example")
.block_on(lazy(|| {
let config = Config::default();
let mut digest = Sha256::new();
Client::default()
.post("http://127.0.0.1:8010/")
.header("User-Agent", "Actix Web")
.authorization_signature_with_digest(
&config,
"my-key-id",
&mut digest,
"Hewwo-owo",
|s| Ok(base64::encode(s)) as Result<_, MyError>,
)
.unwrap()
.send()
.map_err(|_| ())
.and_then(|mut res| res.body().map_err(|_| ()))
.map(|body| {
println!("{:?}", body);
})
}))
.unwrap();
}
#[derive(Debug, Fail)]
pub enum MyError {
#[fail(display = "Failed to read header, {}", _0)]
Convert(#[cause] ToStrError),
#[fail(display = "Failed to create header, {}", _0)]
Header(#[cause] InvalidHeaderValue),
}
impl From<ToStrError> for MyError {
fn from(e: ToStrError) -> Self {
MyError::Convert(e)
}
}
impl From<InvalidHeaderValue> for MyError {
fn from(e: InvalidHeaderValue) -> Self {
MyError::Header(e)
}
}
```
#### Or, use it in your server
```rust
use actix::System;
use actix_web::{web, App, HttpResponse, HttpServer, ResponseError};
use failure::Fail;
use http_signature_normalization_actix::{prelude::*, verify::Algorithm};
use sha2::{Digest, Sha256};
#[derive(Clone, Debug)]
struct MyVerify;
impl SignatureVerify for MyVerify {
type Error = MyError;
type Future = Result<bool, Self::Error>;
fn signature_verify(
&mut self,
algorithm: Option<Algorithm>,
key_id: &str,
signature: &str,
signing_string: &str,
) -> Self::Future {
match algorithm {
Some(Algorithm::Hs2019) => (),
_ => return Err(MyError::Algorithm),
};
if key_id != "my-key-id" {
return Err(MyError::Key);
}
let decoded = base64::decode(signature).map_err(|_| MyError::Decode)?;
Ok(decoded == signing_string.as_bytes())
}
}
fn index(_: (DigestVerified, SignatureVerified)) -> &'static str {
"Eyyyyup"
}
fn main() -> Result<(), Box<dyn std::error::Error>> {
let sys = System::new("server-example");
let config = Config::default();
HttpServer::new(move || {
App::new()
.wrap(VerifyDigest::new(Sha256::new()).optional())
.wrap(
VerifySignature::new(MyVerify, config.clone())
.authorization()
.optional(),
)
.route("/", web::post().to(index))
})
.bind("127.0.0.1:8010")?
.start();
sys.run()?;
Ok(())
}
#[derive(Debug, Fail)]
enum MyError {
#[fail(display = "Failed to verify, {}", _0)]
Verify(#[cause] PrepareVerifyError),
#[fail(display = "Unsupported algorithm")]
Algorithm,
#[fail(display = "Couldn't decode signature")]
Decode,
#[fail(display = "Invalid key")]
Key,
}
impl ResponseError for MyError {
fn error_response(&self) -> HttpResponse {
HttpResponse::BadRequest().finish()
}
fn render_response(&self) -> HttpResponse {
self.error_response()
}
}
impl From<PrepareVerifyError> for MyError {
fn from(e: PrepareVerifyError) -> Self {
MyError::Verify(e)
}
}
```
### Contributing
Unless otherwise stated, all contributions to this project will be licensed under the CSL with
the exceptions listed in the License section of this file.
### License
This work is licensed under the Cooperative Software License. This is not a Free Software
License, but may be considered a "source-available License." For most hobbyists, self-employed
developers, worker-owned companies, and cooperatives, this software can be used in most
projects so long as this software is distributed under the terms of the CSL. For more
information, see the provided LICENSE file. If none exists, the license can be found online
[here](https://lynnesbian.space/csl/). If you are a free software project and wish to use this
software under the terms of the GNU Affero General Public License, please contact me at
[asonix@asonix.dog](mailto:asonix@asonix.dog) and we can sort that out. If you wish to use this
project under any other license, especially in proprietary software, the answer is likely no.

6
http-signature-normalization-actix/examples/server.rs
View file

@ -62,7 +62,7 @@ fn main() -> Result<(), Box<dyn std::error::Error>> {
#[derive(Debug, Fail)]
enum MyError {
#[fail(display = "Failed to verify, {}", _0)]
Verify(#[cause] VerifyError),
Verify(#[cause] PrepareVerifyError),
#[fail(display = "Unsupported algorithm")]
Algorithm,
@ -84,8 +84,8 @@ impl ResponseError for MyError {
}
}
impl From<VerifyError> for MyError {
fn from(e: VerifyError) -> Self {
impl From<PrepareVerifyError> for MyError {
fn from(e: PrepareVerifyError) -> Self {
MyError::Verify(e)
}
}

22
http-signature-normalization-actix/src/create.rs
View file

@ -1,16 +1,29 @@
//! Types for signing requests with Actix Web
use actix_web::http::header::{
HeaderMap, HeaderName, HeaderValue, InvalidHeaderValue, AUTHORIZATION,
};
/// A thin wrapper around the underlying library's Signed type
///
/// This type can add signatures to Actix Web's HeaderMap
pub struct Signed {
/// The inner Signed type
///
/// This type can produce Strings representing the Authorization or Signature headers
pub signed: http_signature_normalization::create::Signed,
}
/// A thin wrapper around the underlying library's Unsigned type
///
/// This is used to prodice the proper Signed type
pub struct Unsigned {
/// The inner Unsigned type
pub unsigned: http_signature_normalization::create::Unsigned,
}
impl Signed {
/// Add the Signature Header to a given HeaderMap
pub fn signature_header(self, hm: &mut HeaderMap) -> Result<(), InvalidHeaderValue> {
let sig_header = self.signed.signature_header();
hm.insert(
@ -21,6 +34,7 @@ impl Signed {
Ok(())
}
/// Add the Authorization Header to a give HeaderMap
pub fn authorization_header(self, hm: &mut HeaderMap) -> Result<(), InvalidHeaderValue> {
let auth_header = self.signed.authorization_header();
hm.insert(AUTHORIZATION, HeaderValue::from_str(&auth_header)?);
@ -29,6 +43,14 @@ impl Signed {
}
impl Unsigned {
/// Sign the signing_string for the request
///
/// ```rust,ignore
/// let signed = unsigned.sign("my-key-id".to_owned(), |signing_string| {
/// let signature = private_key.sign(signing_string)?;
/// Ok(base64::encode(signature))
/// })?;
/// ```
pub fn sign<F, E>(self, key_id: String, f: F) -> Result<Signed, E>
where
F: FnOnce(&str) -> Result<String, E>,

29
http-signature-normalization-actix/src/digest/middleware.rs
View file

@ -1,3 +1,5 @@
//! Types for setting up Digest middleware verification
use actix_web::{
dev::{Body, Payload, Service, ServiceRequest, ServiceResponse, Transform},
error::PayloadError,
@ -16,21 +18,48 @@ use std::{cell::RefCell, rc::Rc};
use super::{DigestPart, DigestVerify};
#[derive(Copy, Clone, Debug)]
/// A type implementing FromRequest that can be used in route handler to guard for verified
/// digests
///
/// This is only required when the [`VerifyDigest`] middleware is set to optional
pub struct DigestVerified;
/// The VerifyDigest middleware
///
/// ```rust,ignore
/// let middleware = VerifyDigest::new(MyVerify::new())
/// .optional();
///
/// HttpServer::new(move || {
/// App::new()
/// .wrap(middleware.clone())
/// .route("/protected", web::post().to(|_: DigestVerified| "Verified Digest Header"))
/// .route("/unprotected", web::post().to(|| "No verification required"))
/// })
/// ```
pub struct VerifyDigest<T>(bool, T);
#[doc(hidden)]
pub struct VerifyMiddleware<T, S>(Rc<RefCell<S>>, bool, T);
#[derive(Debug, Fail)]
#[fail(display = "Error verifying digest")]
#[doc(hidden)]
pub struct VerifyError;
impl<T> VerifyDigest<T>
where
T: DigestVerify + Clone,
{
/// Produce a new VerifyDigest with a user-provided [`Digestverify`] type
pub fn new(verify_digest: T) -> Self {
VerifyDigest(true, verify_digest)
}
/// Mark verifying the Digest as optional
///
/// If a digest is present in the request, it will be verified, but it is not required to be
/// present
pub fn optional(self) -> Self {
VerifyDigest(false, self.1)
}

37
http-signature-normalization-actix/src/digest/mod.rs
View file

@ -1,3 +1,8 @@
//! Types and Traits for creating and verifying Digest headers
//!
//! Digest headers are commonly used in conjunction with HTTP Signatures to verify the whole
//! request when request bodies are present
use actix_web::{
client::{ClientRequest, ClientResponse},
error::PayloadError,
@ -11,23 +16,36 @@ use crate::{Config, Sign};
pub mod middleware;
#[cfg(feature = "sha-2")]
pub mod sha2;
mod sha2;
#[cfg(feature = "sha-3")]
pub mod sha3;
mod sha3;
mod sign;
/// A trait for creating digests of an array of bytes
pub trait DigestCreate {
/// The name of the digest algorithm
const NAME: &'static str;
/// Compute the digest of the input bytes
fn compute(&mut self, input: &[u8]) -> String;
}
/// A trait for verifying digests
pub trait DigestVerify {
/// Verify the payload of the request against a slice of digests
///
/// The slice of digests should never be empty
fn verify(&mut self, digests: &[DigestPart], payload: &[u8]) -> bool;
}
/// Extend the Sign trait with support for adding Digest Headers to the request
///
/// It generates HTTP Signatures after the Digest header has been added, in order to have
/// verification that the body has not been tampered with, or that the request can't be replayed by
/// a malicious entity
pub trait SignExt: Sign {
/// Set the Digest and Authorization headers on the request
fn authorization_signature_with_digest<F, E, K, D, V>(
self,
config: &Config,
@ -44,6 +62,7 @@ pub trait SignExt: Sign {
V: AsRef<[u8]>,
Self: Sized;
/// Set the Digest and Signature headers on the request
fn signature_with_digest<F, E, K, D, V>(
self,
config: &Config,
@ -61,11 +80,19 @@ pub trait SignExt: Sign {
Self: Sized;
}
/// A parsed digest from the request
pub struct DigestPart {
/// The alrogithm used to produce the digest
pub algorithm: String,
/// The digest itself
pub digest: String,
}
/// An intermediate type between setting the Digest and Signature or Authorization headers, and
/// actually sending the request
///
/// This exists so that the return type for the [`SignExt`] trait can be named
pub struct DigestClient<V> {
req: ClientRequest,
body: V,
@ -75,10 +102,14 @@ impl<V> DigestClient<V>
where
V: AsRef<[u8]>,
{
pub fn new(req: ClientRequest, body: V) -> Self {
fn new(req: ClientRequest, body: V) -> Self {
DigestClient { req, body }
}
/// Send the request
///
/// This is analogous to `ClientRequest::send_body` and uses the body provided when producing
/// the digest
pub fn send(
self,
) -> impl Future<Item = ClientResponse<impl Stream<Item = Bytes, Error = PayloadError>>> {

207
http-signature-normalization-actix/src/lib.rs
View file

@ -1,8 +1,176 @@
#![deny(missing_docs)]
//! # Integration of Http Signature Normalization with Actix Web
//!
//! This library provides middlewares for verifying HTTP Signature headers and, optionally, Digest
//! headers with the `digest` feature enabled. It also extends actix_web's ClientRequest type to
//! add signatures and digests to the request
//!
//! ### Use it in a server
//! ```rust,ignore
//! use actix::System;
//! use actix_web::{web, App, HttpResponse, HttpServer, ResponseError};
//! use failure::Fail;
//! use http_signature_normalization_actix::{prelude::*, verify::Algorithm};
//! use sha2::{Digest, Sha256};
//!
//! #[derive(Clone, Debug)]
//! struct MyVerify;
//!
//! impl SignatureVerify for MyVerify {
//! type Error = MyError;
//! type Future = Result<bool, Self::Error>;
//!
//! fn signature_verify(
//! &mut self,
//! algorithm: Option<Algorithm>,
//! key_id: &str,
//! signature: &str,
//! signing_string: &str,
//! ) -> Self::Future {
//! match algorithm {
//! Some(Algorithm::Hs2019) => (),
//! _ => return Err(MyError::Algorithm),
//! };
//!
//! if key_id != "my-key-id" {
//! return Err(MyError::Key);
//! }
//!
//! let decoded = base64::decode(signature).map_err(|_| MyError::Decode)?;
//!
//! // In a real system, you'd want to actually verify a signature, not just check for
//! // byte equality
//! Ok(decoded == signing_string.as_bytes())
//! }
//! }
//!
//! fn index(_: (DigestVerified, SignatureVerified)) -> &'static str {
//! "Eyyyyup"
//! }
//!
//! fn main() -> Result<(), Box<dyn std::error::Error>> {
//! let sys = System::new("server-example");
//!
//! let config = Config::default();
//!
//! HttpServer::new(move || {
//! App::new()
//! .wrap(VerifyDigest::new(Sha256::new()).optional())
//! .wrap(
//! VerifySignature::new(MyVerify, config.clone())
//! .authorization()
//! .optional(),
//! )
//! .route("/", web::post().to(index))
//! })
//! .bind("127.0.0.1:8010")?
//! .start();
//!
//! sys.run()?;
//! Ok(())
//! }
//!
//! #[derive(Debug, Fail)]
//! enum MyError {
//! #[fail(display = "Failed to verify, {}", _0)]
//! Verify(#[cause] PrepareVerifyError),
//!
//! #[fail(display = "Unsupported algorithm")]
//! Algorithm,
//!
//! #[fail(display = "Couldn't decode signature")]
//! Decode,
//!
//! #[fail(display = "Invalid key")]
//! Key,
//! }
//!
//! impl ResponseError for MyError {
//! fn error_response(&self) -> HttpResponse {
//! HttpResponse::BadRequest().finish()
//! }
//!
//! fn render_response(&self) -> HttpResponse {
//! self.error_response()
//! }
//! }
//!
//! impl From<PrepareVerifyError> for MyError {
//! fn from(e: PrepareVerifyError) -> Self {
//! MyError::Verify(e)
//! }
//! }
//! ```
//!
//! ### Use it in a client
//! ```rust,ignore
//! use actix::System;
//! use actix_web::client::Client;
//! use failure::Fail;
//! use futures::future::{lazy, Future};
//! use http_signature_normalization_actix::prelude::*;
//! use sha2::{Digest, Sha256};
//!
//! fn main() {
//! System::new("client-example")
//! .block_on(lazy(|| {
//! let config = Config::default();
//! let mut digest = Sha256::new();
//!
//! Client::default()
//! .post("http://127.0.0.1:8010/")
//! .header("User-Agent", "Actix Web")
//! .authorization_signature_with_digest(
//! &config,
//! "my-key-id",
//! &mut digest,
//! "Hewwo-owo",
//! |s| {
//! // In a real-world system, you'd actually want to sign the string,
//! // not just base64 encode it
//! Ok(base64::encode(s)) as Result<_, MyError>
//! },
//! )
//! .unwrap()
//! .send()
//! .map_err(|_| ())
//! .and_then(|mut res| res.body().map_err(|_| ()))
//! .map(|body| {
//! println!("{:?}", body);
//! })
//! }))
//! .unwrap();
//! }
//!
//! #[derive(Debug, Fail)]
//! pub enum MyError {
//! #[fail(display = "Failed to read header, {}", _0)]
//! Convert(#[cause] ToStrError),
//!
//! #[fail(display = "Failed to create header, {}", _0)]
//! Header(#[cause] InvalidHeaderValue),
//! }
//!
//! impl From<ToStrError> for MyError {
//! fn from(e: ToStrError) -> Self {
//! MyError::Convert(e)
//! }
//! }
//!
//! impl From<InvalidHeaderValue> for MyError {
//! fn from(e: InvalidHeaderValue) -> Self {
//! MyError::Header(e)
//! }
//! }
//! ```
use actix_web::http::{
header::{HeaderMap, InvalidHeaderValue, ToStrError},
uri::PathAndQuery,
Method,
};
use failure::Fail;
use futures::future::IntoFuture;
use std::{collections::BTreeMap, fmt::Display};
@ -14,11 +182,13 @@ pub mod digest;
pub mod create;
pub mod middleware;
/// Useful types and traits for using this library in Actix Web
pub mod prelude {
pub use crate::{
middleware::{SignatureVerified, VerifySignature},
verify::Unverified,
Config, Sign, SignatureVerify, VerifyError,
Config, PrepareVerifyError, Sign, SignatureVerify,
};
#[cfg(feature = "digest")]
@ -29,6 +199,8 @@ pub mod prelude {
pub use actix_web::http::header::{InvalidHeaderValue, ToStrError};
}
/// Types for Verifying an HTTP Signature
pub mod verify {
pub use http_signature_normalization::verify::{
Algorithm, DeprecatedAlgorithm, ParseSignatureError, ParsedHeader, Unvalidated, Unverified,
@ -41,10 +213,17 @@ use self::{
verify::{Algorithm, Unverified},
};
/// A trait for verifying signatures
pub trait SignatureVerify {
/// An error produced while attempting to verify the signature. This can be anything
/// implementing ResponseError
type Error: actix_web::ResponseError;
/// The future that resolves to the verification state of the signature
type Future: IntoFuture<Item = bool, Error = Self::Error>;
/// Given the algorithm, key_id, signature, and signing_string, produce a future that resulves
/// to a the verification status
fn signature_verify(
&mut self,
algorithm: Option<Algorithm>,
@ -54,7 +233,9 @@ pub trait SignatureVerify {
) -> Self::Future;
}
/// A trait implemented by the Actix Web ClientRequest type to add an HTTP signature to the request
pub trait Sign {
/// Add an Authorization Signature to the request
fn authorization_signature<F, E, K>(self, config: &Config, key_id: K, f: F) -> Result<Self, E>
where
F: FnOnce(&str) -> Result<String, E>,
@ -62,6 +243,7 @@ pub trait Sign {
K: Display,
Self: Sized;
/// Add a Signature to the request
fn signature<F, E, K>(self, config: &Config, key_id: K, f: F) -> Result<Self, E>
where
F: FnOnce(&str) -> Result<String, E>,
@ -71,20 +253,26 @@ pub trait Sign {
}
#[derive(Clone, Debug, Default)]
/// A thin wrapper around the underlying library's config type
pub struct Config {
/// The inner config type
pub config: http_signature_normalization::Config,
}
#[derive(Debug, Fail)]
pub enum VerifyError {
/// An error when preparing to verify a request
pub enum PrepareVerifyError {
#[fail(display = "Signature error, {}", _0)]
Sig(#[cause] http_signature_normalization::VerifyError),
/// An error validating the request
Sig(#[cause] http_signature_normalization::PrepareVerifyError),
#[fail(display = "Failed to read header, {}", _0)]
/// An error converting the header to a string for validation
Header(#[cause] ToStrError),
}
impl Config {
/// Begin the process of singing a request
pub fn begin_sign(
&self,
method: &Method,
@ -107,12 +295,13 @@ impl Config {
Ok(Unsigned { unsigned })
}
/// Begin the proess of verifying a request
pub fn begin_verify(
&self,
method: &Method,
path_and_query: Option<&PathAndQuery>,
headers: HeaderMap,
) -> Result<Unverified, VerifyError> {
) -> Result<Unverified, PrepareVerifyError> {
let headers = headers
.iter()
.map(|(k, v)| v.to_str().map(|v| (k.to_string(), v.to_string())))
@ -130,14 +319,14 @@ impl Config {
}
}
impl From<http_signature_normalization::VerifyError> for VerifyError {
fn from(e: http_signature_normalization::VerifyError) -> Self {
VerifyError::Sig(e)
impl From<http_signature_normalization::PrepareVerifyError> for PrepareVerifyError {
fn from(e: http_signature_normalization::PrepareVerifyError) -> Self {
PrepareVerifyError::Sig(e)
}
}
impl From<ToStrError> for VerifyError {
impl From<ToStrError> for PrepareVerifyError {
fn from(e: ToStrError) -> Self {
VerifyError::Header(e)
PrepareVerifyError::Header(e)
}
}

37
http-signature-normalization-actix/src/middleware.rs
View file

@ -1,3 +1,5 @@
//! Types for verifying requests with Actix Web
use actix_web::{
dev::{Body, Payload, Service, ServiceRequest, ServiceResponse, Transform},
FromRequest, HttpMessage, HttpRequest, HttpResponse, ResponseError,
@ -12,32 +14,65 @@ use std::{cell::RefCell, rc::Rc};
use crate::{Config, SignatureVerify};
#[derive(Copy, Clone, Debug)]
/// A marker type that can be used to guard routes when the signature middleware is set to
/// 'optional'
pub struct SignatureVerified;
#[derive(Clone, Debug)]
/// The Verify signature middleware
///
/// ```rust,ignore
/// let middleware = VerifySignature::new(MyVerifier::new(), Config::default())
/// .authorization()
/// .optional();
///
/// HttpServer::new(move || {
/// App::new()
/// .wrap(middleware.clone())
/// .route("/protected", web::post().to(|_: SignatureVerified| "Verified Authorization Header"))
/// .route("/unprotected", web::post().to(|| "No verification required"))
/// })
/// ```
pub struct VerifySignature<T>(T, Config, HeaderKind, bool);
#[derive(Clone, Debug)]
#[doc(hidden)]
pub struct VerifyMiddleware<T, S>(Rc<RefCell<S>>, Config, HeaderKind, bool, T);
#[derive(Copy, Clone, Debug, Eq, Ord, PartialEq, PartialOrd)]
pub enum HeaderKind {
enum HeaderKind {
Authorization,
Signature,
}
#[derive(Clone, Debug, Fail)]
#[fail(display = "Failed to verify http signature")]
#[doc(hidden)]
pub struct VerifyError;
impl<T> VerifySignature<T>
where
T: SignatureVerify,
{
/// Create a new middleware for verifying HTTP Signatures. A type implementing
/// [`SignatureVerify`] is required, as well as a Config
///
/// By default, this middleware expects to verify Signature headers, and requires the presence
/// of the header
pub fn new(verify_signature: T, config: Config) -> Self {
VerifySignature(verify_signature, config, HeaderKind::Signature, true)
}
/// Verify Authorization headers instead of Signature headers
pub fn authorization(self) -> Self {
VerifySignature(self.0, self.1, HeaderKind::Authorization, self.3)
}
/// Mark the presence of a Signature or Authorization header as optional
///
/// If a header is present, it will be verified, but if there is not one present, the request
/// is passed through. This can be used to set a global middleware, and then guard each route
/// handler with the [`SignatureVerified`] type.
pub fn optional(self) -> Self {
VerifySignature(self.0, self.1, self.2, false)
}

19
http-signature-normalization-http/src/create.rs
View file

@ -1,14 +1,22 @@
//! Types used for signing a request
use http::header::{HeaderMap, HeaderName, HeaderValue, InvalidHeaderValue, AUTHORIZATION};
/// A thin wrapper around the base library's Signed type
pub struct Signed {
/// The inner Signed type which can produce string versions of HTTP headers
pub signed: http_signature_normalization::create::Signed,
}
/// A thin wrapper around the base library's Unsigned type
///
/// This is used to produce a Signed type that can interact with http's types
pub struct Unsigned {
/// The inner Unsigned type, which can produce the base library's Signed type
pub unsigned: http_signature_normalization::create::Unsigned,
}
impl Signed {
/// Set the Signature Header in a given HeaderMap
pub fn signature_header(self, hm: &mut HeaderMap) -> Result<(), InvalidHeaderValue> {
hm.insert(
HeaderName::from_static("Signature"),
@ -18,6 +26,7 @@ impl Signed {
Ok(())
}
/// Set the Authorization Header in a given HeaderMap
pub fn authorization_header(self, hm: &mut HeaderMap) -> Result<(), InvalidHeaderValue> {
hm.insert(
AUTHORIZATION,
@ -28,9 +37,17 @@ impl Signed {
}
impl Unsigned {
/// Sign the request
///
/// ```rust,ignore
/// let signed = unsigned.sign("my-key-id".to_owned(), |signing_string| {
/// let signature = private_key.sign(signing_string)?;
/// Ok(base64::encode(signature))
/// })?;
/// ```
pub fn sign<F, E>(self, key_id: String, f: F) -> Result<Signed, E>
where
F: FnOnce(&str) -> Result<Vec<u8>, E>,
F: FnOnce(&str) -> Result<String, E>,
{
let signed = self.unsigned.sign(key_id, f)?;
Ok(Signed { signed })

53
http-signature-normalization-http/src/lib.rs
View file

@ -1,3 +1,9 @@
#![deny(missing_docs)]
//! Integration of Http Signature Normalization with the HTTP crate
//!
//! This provides a thin wrapper around transforming HTTP's `HeaderMap`, `PathAndQuery`, and
//! `Method` types into BTreeMaps and Strings for signing and verifying requests
use http::{
header::{HeaderMap, ToStrError},
method::Method,
@ -7,6 +13,7 @@ use std::{collections::BTreeMap, error::Error, fmt};
use self::{create::Unsigned, verify::Unverified};
/// Export useful types signing and verifying requests
pub mod prelude {
pub use http::{
header::{HeaderMap, InvalidHeaderValue, ToStrError},
@ -21,11 +28,12 @@ pub mod prelude {
ValidateError,
};
pub use crate::{Config, VerifyError};
pub use crate::{Config, PrepareVerifyError};
}
pub mod create;
/// Export types used for signature verification
pub mod verify {
pub use http_signature_normalization::verify::{
Algorithm, DeprecatedAlgorithm, ParseSignatureError, ParsedHeader, Unvalidated, Unverified,
@ -34,17 +42,25 @@ pub mod verify {
}
#[derive(Clone, Default)]
/// Thinly wrap Http Signature Normalization's config type
pub struct Config {
/// Expose the inner Config
pub config: http_signature_normalization::Config,
}
#[derive(Debug)]
pub enum VerifyError {
Sig(http_signature_normalization::VerifyError),
/// Errors produced when preparing to verify an Http Signature
pub enum PrepareVerifyError {
/// There was an error in the underlying library
Sig(http_signature_normalization::PrepareVerifyError),
/// There was an error producing a String from the HeaderValue
Header(ToStrError),
}
impl Config {
/// Begin the process of signing a request
///
/// The types required from this function can be produced from http's Request and URI types.
pub fn begin_sign(
&self,
method: &Method,
@ -67,12 +83,15 @@ impl Config {
Ok(Unsigned { unsigned })
}
/// Begin the process of verifying a request
///
/// The types required from this function can be produced from http's Request and URI types.
pub fn begin_verify(
&self,
method: &Method,
path_and_query: Option<&PathAndQuery>,
headers: HeaderMap,
) -> Result<Unverified, VerifyError> {
) -> Result<Unverified, PrepareVerifyError> {
let headers = headers
.iter()
.map(|(k, v)| v.to_str().map(|v| (k.to_string(), v.to_string())))
@ -90,39 +109,39 @@ impl Config {
}
}
impl fmt::Display for VerifyError {
impl fmt::Display for PrepareVerifyError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
VerifyError::Sig(ref e) => write!(f, "Sig error, {}", e),
VerifyError::Header(ref e) => write!(f, "Header error, {}", e),
PrepareVerifyError::Sig(ref e) => write!(f, "Sig error, {}", e),
PrepareVerifyError::Header(ref e) => write!(f, "Header error, {}", e),
}
}
}
impl Error for VerifyError {
impl Error for PrepareVerifyError {
fn description(&self) -> &str {
match *self {
VerifyError::Sig(ref e) => e.description(),
VerifyError::Header(ref e) => e.description(),
PrepareVerifyError::Sig(ref e) => e.description(),
PrepareVerifyError::Header(ref e) => e.description(),
}
}
fn source(&self) -> Option<&(dyn Error + 'static)> {
match *self {
VerifyError::Sig(ref e) => Some(e),
VerifyError::Header(ref e) => Some(e),
PrepareVerifyError::Sig(ref e) => Some(e),
PrepareVerifyError::Header(ref e) => Some(e),
}
}
}
impl From<http_signature_normalization::VerifyError> for VerifyError {
fn from(e: http_signature_normalization::VerifyError) -> Self {
VerifyError::Sig(e)
impl From<http_signature_normalization::PrepareVerifyError> for PrepareVerifyError {
fn from(e: http_signature_normalization::PrepareVerifyError) -> Self {
PrepareVerifyError::Sig(e)
}
}
impl From<ToStrError> for VerifyError {
impl From<ToStrError> for PrepareVerifyError {
fn from(e: ToStrError) -> Self {
VerifyError::Header(e)
PrepareVerifyError::Header(e)
}
}

18
src/create.rs
View file

@ -1,3 +1,4 @@
//! Types and logic for creating signature and authorization headers
use chrono::{DateTime, Utc};
use crate::{
@ -6,6 +7,9 @@ use crate::{
};
#[derive(Debug)]
/// The signed stage of creating a signature
///
/// From here, the Signature or Authorization headers can be generated as string
pub struct Signed {
signature: String,
sig_headers: Vec<String>,
@ -15,6 +19,10 @@ pub struct Signed {
}
#[derive(Debug)]
/// The Unsigned stage of creating a signature
///
/// From here, the `sign` method can be used to sign the signing_string, producing a [`Signed`]
/// type.
pub struct Unsigned {
pub(crate) signing_string: String,
pub(crate) sig_headers: Vec<String>,
@ -23,10 +31,16 @@ pub struct Unsigned {
}
impl Signed {
/// Turn the Signed type into a String that can be used as the Signature Header
///
/// Done manually, it would look like `format!("Signature: {}", signed.signature_header())`
pub fn signature_header(self) -> String {
format!("Signature {}", self.into_header())
}
/// Turn the Signed type into a String that can be used as the Authorization Header
///
/// Done manually, it would look like `format!("Authorization: {}", signed.authorization_header())`
pub fn authorization_header(self) -> String {
self.into_header()
}
@ -50,6 +64,10 @@ impl Signed {
}
impl Unsigned {
/// Sign the signing string, producing a String that can be used in an HTTP Header
///
/// When using RSA or HMAC to sign the string, be sure to base64-encode the result to produce a
/// String.
pub fn sign<F, E>(self, key_id: String, f: F) -> Result<Signed, E>
where
F: FnOnce(&str) -> Result<String, E>,

114
src/lib.rs
View file

@ -1,3 +1,49 @@
#![deny(missing_docs)]
//! # HTTP Signature Normaliztion
//! _An HTTP Signatures library that leaves the signing to you_
//!
//! - [crates.io](https://crates.io/crates/http-signature-normalization)
//! - [docs.rs](https://docs.rs/http-signature-normalization)
//! - [Join the discussion on Matrix](https://matrix.to/#/!IRQaBCMWKbpBWKjQgx:asonix.dog?via=asonix.dog)
//!
//! Http Signature Normalization is a minimal-dependency crate for producing HTTP Signatures with user-provided signing and verification. The API is simple; there's a series of steps for creation and verification with types that ensure reasonable usage.
//!
//! ```rust
//! use chrono::Duration;
//! use http_signature_normalization::Config;
//! use std::collections::BTreeMap;
//!
//! fn main() -> Result<(), Box<dyn std::error::Error>> {
//! let config = Config {
//! expires_after: Duration::seconds(5),
//! };
//!
//! let headers = BTreeMap::new();
//!
//! let signature_header_value = config
//! .begin_sign("GET", "/foo?bar=baz", headers)
//! .sign("my-key-id".to_owned(), |signing_string| {
//! // sign the string here
//! Ok(signing_string.to_owned()) as Result<_, Box<dyn std::error::Error>>
//! })?
//! .signature_header();
//!
//! let mut headers = BTreeMap::new();
//! headers.insert("Signature".to_owned(), signature_header_value);
//!
//! let verified = config
//! .begin_verify("GET", "/foo?bar=baz", headers)?
//! .verify(|sig, signing_string| {
//! // Verify the signature here
//! sig == signing_string
//! });
//!
//! assert!(verified);
//! Ok(())
//! }
//! ```
use chrono::{DateTime, Duration, Utc};
use std::{collections::BTreeMap, error::Error, fmt};
@ -22,17 +68,29 @@ const HEADERS_FIELD: &'static str = "headers";
const SIGNATURE_FIELD: &'static str = "signature";
#[derive(Clone, Debug)]
/// Configuration for signing and verifying signatures
///
/// Currently, the only configuration provided is how long a signature should be considered valid
/// before it expires.
pub struct Config {
/// How long a singature is valid
pub expires_after: Duration,
}
#[derive(Debug)]
pub enum VerifyError {
/// Error preparing a header for validation
///
/// This could be due to a missing header, and unparsable header, or an expired header
pub enum PrepareVerifyError {
/// Error validating the header
Validate(ValidateError),
/// Error parsing the header
Parse(ParseSignatureError),
}
impl Config {
/// Perform the neccessary operations to produce an [`Unsigned`] type, which can be used to
/// sign the header
pub fn begin_sign(
&self,
method: &str,
@ -65,12 +123,14 @@ impl Config {
}
}
/// Perform the neccessary operations to produce and [`Unerified`] type, which can be used to
/// verify the header
pub fn begin_verify(
&self,
method: &str,
path_and_query: &str,
headers: BTreeMap<String, String>,
) -> Result<Unverified, VerifyError> {
) -> Result<Unverified, PrepareVerifyError> {
let mut headers: BTreeMap<String, String> = headers
.into_iter()
.map(|(k, v)| (k.to_lowercase().to_owned(), v))
@ -129,40 +189,40 @@ fn build_signing_string(
signing_string
}
impl fmt::Display for VerifyError {
impl fmt::Display for PrepareVerifyError {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
VerifyError::Validate(ref e) => fmt::Display::fmt(e, f),
VerifyError::Parse(ref e) => fmt::Display::fmt(e, f),
PrepareVerifyError::Validate(ref e) => fmt::Display::fmt(e, f),
PrepareVerifyError::Parse(ref e) => fmt::Display::fmt(e, f),
}
}
}
impl Error for VerifyError {
impl Error for PrepareVerifyError {
fn description(&self) -> &str {
match *self {
VerifyError::Validate(ref e) => e.description(),
VerifyError::Parse(ref e) => e.description(),
PrepareVerifyError::Validate(ref e) => e.description(),
PrepareVerifyError::Parse(ref e) => e.description(),
}
}
fn source(&self) -> Option<&(dyn Error + 'static)> {
match *self {
VerifyError::Validate(ref e) => Some(e),
VerifyError::Parse(ref e) => Some(e),
PrepareVerifyError::Validate(ref e) => Some(e),
PrepareVerifyError::Parse(ref e) => Some(e),
}
}
}
impl From<ValidateError> for VerifyError {
impl From<ValidateError> for PrepareVerifyError {
fn from(v: ValidateError) -> Self {
VerifyError::Validate(v)
PrepareVerifyError::Validate(v)
}
}
impl From<ParseSignatureError> for VerifyError {
impl From<ParseSignatureError> for PrepareVerifyError {
fn from(p: ParseSignatureError) -> Self {
VerifyError::Parse(p)
PrepareVerifyError::Parse(p)
}
}
@ -189,7 +249,7 @@ mod tests {
}
#[test]
fn round_trip() {
fn round_trip_authorization() {
let headers = prepare_headers();
let config = Config::default();
@ -211,4 +271,28 @@ mod tests {
assert!(verified);
}
#[test]
fn round_trip_signature() {
let headers = prepare_headers();
let config = Config::default();
let signature_header = config
.begin_sign("GET", "/foo?bar=baz", headers)
.sign("hi".to_owned(), |s| {
Ok(s.to_owned()) as Result<_, std::io::Error>
})
.unwrap()
.signature_header();
let mut headers = prepare_headers();
headers.insert("Signature".to_owned(), signature_header);
let verified = config
.begin_verify("GET", "/foo?bar=baz", headers)
.unwrap()
.verify(|sig, signing_string| sig == signing_string);
assert!(verified);
}
}

69
src/verify.rs
View file

@ -1,3 +1,4 @@
//! Types and methods to verify a signature or authorization header
use chrono::{DateTime, Duration, TimeZone, Utc};
use std::{
collections::{BTreeMap, HashMap},
@ -12,6 +13,10 @@ use crate::{
};
#[derive(Debug)]
/// The Unverified step of the verification process
///
/// This type is the result of performing some basic validation on the parsed header, and can be
/// used to verify the header
pub struct Unverified {
key_id: String,
signature: String,
@ -20,6 +25,10 @@ pub struct Unverified {
}
#[derive(Debug)]
/// The Unvalidated stage
///
/// This is created after generating the signing string from a parsed header, and transitions into
/// the Unverified type by applying some basic validations
pub struct Unvalidated {
pub(crate) key_id: String,
pub(crate) signature: String,
@ -31,6 +40,7 @@ pub struct Unvalidated {
}
#[derive(Debug)]
/// The successful result of parsing a Signature or Authorization header
pub struct ParsedHeader {
signature: String,
key_id: String,
@ -42,46 +52,102 @@ pub struct ParsedHeader {
}
#[derive(Clone, Copy, Debug)]
/// Algorithms that may be present in an HTTP Signature's `algorithm` field, but are considered
/// deprecated due to security issues
///
/// Most of these are Deprecated solely because the presence of the algorithm's name in the request
/// could be used to gain insight into ways to forge requests. This doesn't mean that using these
/// algorithms to sign and verify requests is bad, it just means that stating which algorithm is in
/// use is dangerous. In the case of the SHA1 variants, they were deprecated for being weak
/// hashes.
///
/// This library only produces HTTP Signatures with the "HS2019" algorithm type, and leaves
/// deciding which algorithm to actually use to implementors
pub enum DeprecatedAlgorithm {
/// HMAC SHA-1
HmacSha1,
/// HMAC SHA-256
HmacSha256,
/// HMAC SHA-384
HmacSha384,
/// HMAC SHA-512
HmacSha512,
/// RSA SHA-1
RsaSha1,
/// RSA SHA-256
RsaSha256,
/// RSA SHA-384
RsaSha384,
/// RSA SHA-512
RsaSha512,
/// ECDSA SHA-1
EcdsaSha1,
/// ECDSA SHA-256
EcdsaSha256,
/// ECDSA SHA-384
EcdsaSha384,
/// ECDSA SHA-512
EcdsaSha512,
}
#[derive(Clone, Debug)]
/// Kinds of algorithms
///
/// This library knows about HS2019 as a supported algorithm, and any other algorithms are either
/// unknown at the time of writing, or deprecated
pub enum Algorithm {
/// The only officially supported algorithm from the current HTTP Signatures specification
Hs2019,
/// Algorithms that have been used historically, but are deprecated
Deprecated(DeprecatedAlgorithm),
/// Algorithms that may be used by custom implementations and are unknown to the spec
Unknown(String),
}
#[derive(Clone, Debug)]
/// Kinds of errors for validating a request
pub enum ValidateError {
/// The Authorization or Signature header is not present
Missing,
/// The request's `created` or `expires` field indicates it is too old to be valid
Expired,
}
#[derive(Clone, Debug)]
/// The error produced when parsing the HTTPT Signature fails, including the name of the field that
/// was invalid.
pub struct ParseSignatureError(&'static str);
impl Unverified {
/// Get the Key ID from an Unverified type
///
/// This is useful for looking up the proper verification key to verify the request
pub fn key_id(&self) -> &str {
&self.key_id
}
/// Get the Algorithm used in the request, if one is present
///
/// If the algorithm is present and is not what an implementor expected, they should not
/// attempt to verify the signature
pub fn algorithm(&self) -> Option<&Algorithm> {
self.algorithm.as_ref()
}
/// Verify the signature with the signature and the signing string
///
/// ```rust,ignore
/// unverified.verify(|signature, signing_string| {
/// let bytes = match base64::decode(signature) {
/// Ok(bytes) => bytes,
/// Err(_) => return false,
/// };
///
/// public_key
/// .verify(bytes, signing_string)
/// .unwrap_or(false)
/// })
/// ```
pub fn verify<F, T>(&self, f: F) -> T
where
F: FnOnce(&str, &str) -> T,
@ -91,6 +157,8 @@ impl Unverified {
}
impl Unvalidated {
/// Validate parts of the header, ensuring that the provided dates don't indicate that it is
/// expired.
pub fn validate(self, expires_after: Duration) -> Result<Unverified, ValidateError> {
if let Some(expires) = self.expires {
if expires < self.parsed_at {
@ -113,6 +181,7 @@ impl Unvalidated {
}
impl ParsedHeader {
/// Generate a Signing String from the header
pub fn into_unvalidated(
self,
method: &str,