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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 https://mozilla.org/MPL/2.0/. */
use crate::hosts::replace_host;
use hyper::client::connect::{Connect, Destination};
use hyper::client::HttpConnector as HyperHttpConnector;
use hyper::rt::Future;
use hyper::{Body, Client};
use hyper_openssl::HttpsConnector;
use openssl::ex_data::Index;
use openssl::ssl::{
Ssl, SslConnector, SslConnectorBuilder, SslContext, SslMethod, SslOptions, SslVerifyMode,
};
use openssl::x509::{self, X509StoreContext};
use std::collections::hash_map::{Entry, HashMap};
use std::sync::{Arc, Mutex};
use tokio::prelude::future::Executor;
pub const BUF_SIZE: usize = 32768;
pub const ALPN_H2_H1: &'static [u8] = b"\x02h2\x08http/1.1";
pub const ALPN_H1: &'static [u8] = b"\x08http/1.1";
// See https://wiki.mozilla.org/Security/Server_Side_TLS for orientation.
const TLS1_2_CIPHERSUITES: &'static str = concat!(
"ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:",
"ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-ECDSA-AES128-GCM-SHA256:",
"ECDHE-RSA-AES256-GCM-SHA384:ECDHE-RSA-AES128-GCM-SHA256:",
"ECDHE-RSA-AES256-SHA:ECDHE-RSA-AES128-SHA@SECLEVEL=2"
);
const SIGNATURE_ALGORITHMS: &'static str = concat!(
"ed448:ed25519:",
"ECDSA+SHA384:ECDSA+SHA256:",
"RSA-PSS+SHA512:RSA-PSS+SHA384:RSA-PSS+SHA256:",
"RSA+SHA512:RSA+SHA384:RSA+SHA256"
);
#[derive(Clone)]
pub struct ConnectionCerts {
certs: Arc<Mutex<HashMap<String, (Vec<u8>, u32)>>>,
}
impl ConnectionCerts {
pub fn new() -> Self {
Self {
certs: Arc::new(Mutex::new(HashMap::new())),
}
}
fn store(&self, host: String, cert_bytes: Vec<u8>) {
let mut certs = self.certs.lock().unwrap();
let entry = certs.entry(host).or_insert((cert_bytes, 0));
entry.1 += 1;
}
pub(crate) fn remove(&self, host: String) -> Option<Vec<u8>> {
match self.certs.lock().unwrap().entry(host) {
Entry::Vacant(_) => return None,
Entry::Occupied(mut e) => {
e.get_mut().1 -= 1;
if e.get().1 == 0 {
return Some((e.remove_entry().1).0);
}
Some(e.get().0.clone())
},
}
}
}
pub struct HttpConnector {
inner: HyperHttpConnector,
}
impl HttpConnector {
fn new() -> HttpConnector {
let mut inner = HyperHttpConnector::new(4);
inner.enforce_http(false);
inner.set_happy_eyeballs_timeout(None);
HttpConnector { inner }
}
}
impl Connect for HttpConnector {
type Transport = <HyperHttpConnector as Connect>::Transport;
type Error = <HyperHttpConnector as Connect>::Error;
type Future = <HyperHttpConnector as Connect>::Future;
fn connect(&self, dest: Destination) -> Self::Future {
// Perform host replacement when making the actual TCP connection.
let mut new_dest = dest.clone();
let addr = replace_host(dest.host());
new_dest.set_host(&*addr).unwrap();
self.inner.connect(new_dest)
}
}
pub type Connector = HttpsConnector<HttpConnector>;
pub type TlsConfig = SslConnectorBuilder;
#[derive(Clone)]
pub struct ExtraCerts(Arc<Mutex<Vec<Vec<u8>>>>);
impl ExtraCerts {
pub fn new() -> Self {
Self(Arc::new(Mutex::new(vec![])))
}
pub fn add(&self, bytes: Vec<u8>) {
self.0.lock().unwrap().push(bytes);
}
}
struct Host(String);
lazy_static! {
static ref EXTRA_INDEX: Index<SslContext, ExtraCerts> = SslContext::new_ex_index().unwrap();
static ref CONNECTION_INDEX: Index<SslContext, ConnectionCerts> =
SslContext::new_ex_index().unwrap();
static ref HOST_INDEX: Index<Ssl, Host> = Ssl::new_ex_index().unwrap();
}
pub fn create_tls_config(
certs: &str,
alpn: &[u8],
extra_certs: ExtraCerts,
connection_certs: ConnectionCerts,
) -> TlsConfig {
// certs include multiple certificates. We could add all of them at once,
// but if any of them were already added, openssl would fail to insert all
// of them.
let mut certs = certs;
let mut cfg = SslConnector::builder(SslMethod::tls()).unwrap();
loop {
let token = "-----END CERTIFICATE-----";
if let Some(index) = certs.find(token) {
let (cert, rest) = certs.split_at(index + token.len());
certs = rest;
let cert = x509::X509::from_pem(cert.as_bytes()).unwrap();
cfg.cert_store_mut()
.add_cert(cert)
.or_else(|e| {
let v: Option<Option<&str>> = e.errors().iter().nth(0).map(|e| e.reason());
if v == Some(Some("cert already in hash table")) {
warn!("Cert already in hash table. Ignoring.");
// Ignore error X509_R_CERT_ALREADY_IN_HASH_TABLE which means the
// certificate is already in the store.
Ok(())
} else {
Err(e)
}
})
.expect("could not set CA file");
} else {
break;
}
}
cfg.set_alpn_protos(alpn)
.expect("could not set alpn protocols");
cfg.set_cipher_list(TLS1_2_CIPHERSUITES)
.expect("could not set TLS 1.2 ciphersuites");
cfg.set_sigalgs_list(SIGNATURE_ALGORITHMS)
.expect("could not set signature algorithms");
cfg.set_options(
SslOptions::NO_SSLV2 |
SslOptions::NO_SSLV3 |
SslOptions::NO_TLSV1 |
SslOptions::NO_TLSV1_1 |
SslOptions::NO_COMPRESSION,
);
cfg.set_ex_data(*EXTRA_INDEX, extra_certs);
cfg.set_ex_data(*CONNECTION_INDEX, connection_certs);
cfg.set_verify_callback(SslVerifyMode::PEER, |verified, x509_store_context| {
if verified {
return true;
}
let ssl_idx = X509StoreContext::ssl_idx().unwrap();
let ssl = x509_store_context.ex_data(ssl_idx).unwrap();
// Obtain the cert bytes for this connection.
let cert = match x509_store_context.current_cert() {
Some(cert) => cert,
None => return false,
};
let pem = match cert.to_pem() {
Ok(pem) => pem,
Err(_) => return false,
};
let ssl_context = ssl.ssl_context();
// Ensure there's an entry stored in the set of known connection certs for this connection.
if let Some(host) = ssl.ex_data(*HOST_INDEX) {
let connection_certs = ssl_context.ex_data(*CONNECTION_INDEX).unwrap();
connection_certs.store((*host).0.clone(), pem.clone());
}
// Fall back to the dynamic set of allowed certs.
let extra_certs = ssl_context.ex_data(*EXTRA_INDEX).unwrap();
for cert in &*extra_certs.0.lock().unwrap() {
if pem == *cert {
return true;
}
}
false
});
cfg
}
pub fn create_http_client<E>(tls_config: TlsConfig, executor: E) -> Client<Connector, Body>
where
E: Executor<Box<dyn Future<Error = (), Item = ()> + Send + 'static>> + Sync + Send + 'static,
{
let mut connector = HttpsConnector::with_connector(HttpConnector::new(), tls_config).unwrap();
connector.set_callback(|configuration, destination| {
configuration.set_ex_data(*HOST_INDEX, Host(destination.host().to_owned()));
Ok(())
});
Client::builder()
.http1_title_case_headers(true)
.executor(executor)
.build(connector)
}
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