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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
extern crate nserror;
extern crate ohttp;
extern crate rand;
extern crate thin_vec;
#[macro_use]
extern crate xpcom;
use nserror::{nsresult, NS_ERROR_FAILURE, NS_ERROR_NOT_AVAILABLE, NS_OK};
use ohttp::hpke::{Aead, Kdf, Kem};
use ohttp::{
ClientRequest, ClientResponse, KeyConfig, KeyId, Server, ServerResponse, SymmetricSuite,
};
use thin_vec::ThinVec;
use xpcom::interfaces::{
nsIObliviousHttpClientRequest, nsIObliviousHttpClientResponse, nsIObliviousHttpServer,
nsIObliviousHttpServerResponse,
};
use xpcom::{xpcom_method, RefPtr};
use std::cell::RefCell;
#[xpcom(implement(nsIObliviousHttpClientResponse), atomic)]
struct ObliviousHttpClientResponse {
response: RefCell<Option<ClientResponse>>,
}
impl ObliviousHttpClientResponse {
xpcom_method!(decapsulate => Decapsulate(enc_response: *const ThinVec<u8>) -> ThinVec<u8>);
fn decapsulate(&self, enc_response: &ThinVec<u8>) -> Result<ThinVec<u8>, nsresult> {
let response = self
.response
.borrow_mut()
.take()
.ok_or(NS_ERROR_NOT_AVAILABLE)?;
let decapsulated = response
.decapsulate(enc_response)
.map_err(|_| NS_ERROR_FAILURE)?;
Ok(decapsulated.into_iter().collect())
}
}
#[xpcom(implement(nsIObliviousHttpClientRequest), atomic)]
struct ObliviousHttpClientRequest {
enc_request: Vec<u8>,
response: RefPtr<nsIObliviousHttpClientResponse>,
}
impl ObliviousHttpClientRequest {
xpcom_method!(get_enc_request => GetEncRequest() -> ThinVec<u8>);
fn get_enc_request(&self) -> Result<ThinVec<u8>, nsresult> {
Ok(self.enc_request.clone().into_iter().collect())
}
xpcom_method!(get_response => GetResponse() -> *const nsIObliviousHttpClientResponse);
fn get_response(&self) -> Result<RefPtr<nsIObliviousHttpClientResponse>, nsresult> {
Ok(self.response.clone())
}
}
#[xpcom(implement(nsIObliviousHttpServerResponse), atomic)]
struct ObliviousHttpServerResponse {
request: Vec<u8>,
server_response: RefCell<Option<ServerResponse>>,
}
impl ObliviousHttpServerResponse {
xpcom_method!(get_request => GetRequest() -> ThinVec<u8>);
fn get_request(&self) -> Result<ThinVec<u8>, nsresult> {
Ok(self.request.clone().into_iter().collect())
}
xpcom_method!(encapsulate => Encapsulate(response: *const ThinVec<u8>) -> ThinVec<u8>);
fn encapsulate(&self, response: &ThinVec<u8>) -> Result<ThinVec<u8>, nsresult> {
let server_response = self
.server_response
.borrow_mut()
.take()
.ok_or(NS_ERROR_NOT_AVAILABLE)?;
Ok(server_response
.encapsulate(response)
.map_err(|_| NS_ERROR_FAILURE)?
.into_iter()
.collect())
}
}
#[xpcom(implement(nsIObliviousHttpServer), atomic)]
struct ObliviousHttpServer {
server: RefCell<Server>,
}
impl ObliviousHttpServer {
xpcom_method!(get_encoded_config => GetEncodedConfig() -> ThinVec<u8>);
fn get_encoded_config(&self) -> Result<ThinVec<u8>, nsresult> {
let server = self.server.borrow_mut();
Ok(server
.config()
.encode()
.map_err(|_| NS_ERROR_FAILURE)?
.into_iter()
.collect())
}
xpcom_method!(decapsulate => Decapsulate(enc_request: *const ThinVec<u8>) -> *const nsIObliviousHttpServerResponse);
fn decapsulate(
&self,
enc_request: &ThinVec<u8>,
) -> Result<RefPtr<nsIObliviousHttpServerResponse>, nsresult> {
let mut server = self.server.borrow_mut();
let (request, server_response) = server
.decapsulate(enc_request)
.map_err(|_| NS_ERROR_FAILURE)?;
let oblivious_http_server_response =
ObliviousHttpServerResponse::allocate(InitObliviousHttpServerResponse {
request,
server_response: RefCell::new(Some(server_response)),
});
oblivious_http_server_response
.query_interface::<nsIObliviousHttpServerResponse>()
.ok_or(NS_ERROR_FAILURE)
}
}
#[xpcom(implement(nsIObliviousHttp), atomic)]
struct ObliviousHttp {}
impl ObliviousHttp {
xpcom_method!(encapsulate_request => EncapsulateRequest(encoded_config: *const ThinVec<u8>,
request: *const ThinVec<u8>) -> *const nsIObliviousHttpClientRequest);
fn encapsulate_request(
&self,
encoded_config: &ThinVec<u8>,
request: &ThinVec<u8>,
) -> Result<RefPtr<nsIObliviousHttpClientRequest>, nsresult> {
ohttp::init();
let client = ClientRequest::new(encoded_config).map_err(|_| NS_ERROR_FAILURE)?;
let (enc_request, response) = client.encapsulate(request).map_err(|_| NS_ERROR_FAILURE)?;
let oblivious_http_client_response =
ObliviousHttpClientResponse::allocate(InitObliviousHttpClientResponse {
response: RefCell::new(Some(response)),
});
let response = oblivious_http_client_response
.query_interface::<nsIObliviousHttpClientResponse>()
.ok_or(NS_ERROR_FAILURE)?;
let oblivious_http_client_request =
ObliviousHttpClientRequest::allocate(InitObliviousHttpClientRequest {
enc_request,
response,
});
oblivious_http_client_request
.query_interface::<nsIObliviousHttpClientRequest>()
.ok_or(NS_ERROR_FAILURE)
}
xpcom_method!(server => Server() -> *const nsIObliviousHttpServer);
fn server(&self) -> Result<RefPtr<nsIObliviousHttpServer>, nsresult> {
ohttp::init();
let key_id: KeyId = rand::random::<u8>();
let kem: Kem = Kem::X25519Sha256;
let symmetric = vec![
SymmetricSuite::new(Kdf::HkdfSha256, Aead::Aes128Gcm),
SymmetricSuite::new(Kdf::HkdfSha256, Aead::ChaCha20Poly1305),
];
let key_config = KeyConfig::new(key_id, kem, symmetric).map_err(|_| NS_ERROR_FAILURE)?;
let server = Server::new(key_config).map_err(|_| NS_ERROR_FAILURE)?;
let oblivious_http_server = ObliviousHttpServer::allocate(InitObliviousHttpServer {
server: RefCell::new(server),
});
oblivious_http_server
.query_interface::<nsIObliviousHttpServer>()
.ok_or(NS_ERROR_FAILURE)
}
}
#[no_mangle]
pub extern "C" fn oblivious_http_constructor(
iid: *const xpcom::nsIID,
result: *mut *mut xpcom::reexports::libc::c_void,
) -> nserror::nsresult {
let oblivious_http = ObliviousHttp::allocate(InitObliviousHttp {});
unsafe { oblivious_http.QueryInterface(iid, result) }
}
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