rustls 0.5.0

Rustls is a modern TLS library written in Rust.
Documentation 
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/* Assorted public API tests. */
use std::sync::Arc;
use std::fs;
use std::io::{self, Write};

extern crate rustls;
use rustls::{ClientConfig, ClientSession};
use rustls::{ServerConfig, ServerSession};
use rustls::Session;
use rustls::internal::pemfile;

fn transfer(left: &mut Session, right: &mut Session) {
  let mut buf = [0u8; 262144];

  while left.wants_write() {
    let sz = left.write_tls(&mut buf.as_mut()).unwrap();
    if sz == 0 {
      return;
    }

    let mut offs = 0;
    loop {
      offs += right.read_tls(&mut buf[offs..sz].as_ref()).unwrap();
      if sz == offs {
        break;
      }
    }
  }
}

fn get_chain() -> Vec<Vec<u8>> {
  pemfile::certs(
    &mut io::BufReader::new(
      fs::File::open("test-ca/rsa/end.fullchain").unwrap()
    )
  ).unwrap()
}

fn get_key() -> Vec<u8> {
  pemfile::rsa_private_keys(
    &mut io::BufReader::new(
      fs::File::open("test-ca/rsa/end.rsa").unwrap()
    )
  ).unwrap()[0].clone()
}

fn make_server_config() -> ServerConfig {
  let mut cfg = ServerConfig::new();
  cfg.set_single_cert(get_chain(), get_key());

  cfg
}

fn make_client_config() -> ClientConfig {
  let mut cfg = ClientConfig::new();
  let mut rootbuf = io::BufReader::new(
    fs::File::open("test-ca/rsa/ca.cert").unwrap()
  );
  cfg.root_store.add_pem_file(&mut rootbuf).unwrap();

  cfg
}

fn do_handshake(client: &mut ClientSession, server: &mut ServerSession) {
  assert_eq!(server.is_handshaking(), true);
  assert_eq!(client.is_handshaking(), true);
  transfer(client, server);
  server.process_new_packets().unwrap();
  assert_eq!(server.is_handshaking(), true);
  assert_eq!(client.is_handshaking(), true);
  transfer(server, client);
  client.process_new_packets().unwrap();
  assert_eq!(server.is_handshaking(), true);
  assert_eq!(client.is_handshaking(), true);
  transfer(client, server);
  server.process_new_packets().unwrap();
  assert_eq!(server.is_handshaking(), false);
  assert_eq!(client.is_handshaking(), true);
  transfer(server, client);
  client.process_new_packets().unwrap();
  assert_eq!(server.is_handshaking(), false);
  assert_eq!(client.is_handshaking(), false);
}

fn alpn_test(server_protos: Vec<String>,
             client_protos: Vec<String>,
             agreed: Option<String>) {
  let mut client_config = make_client_config();
  let mut server_config = make_server_config();

  client_config.alpn_protocols = client_protos;
  server_config.alpn_protocols = server_protos;

  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  assert_eq!(client.get_alpn_protocol(), None);
  assert_eq!(server.get_alpn_protocol(), None);
  do_handshake(&mut client, &mut server);
  assert_eq!(client.get_alpn_protocol(), agreed);
  assert_eq!(server.get_alpn_protocol(), agreed);
}

#[test]
fn alpn() {
  // no support
  alpn_test(vec![],
            vec![],
            None);

  // server support
  alpn_test(vec!["server-proto".to_string()],
            vec![],
            None);

  // client support
  alpn_test(vec![],
            vec!["client-proto".to_string()],
            None);

  // no overlap
  alpn_test(vec!["server-proto".to_string()],
            vec!["client-proto".to_string()],
            None);

  // server chooses preference
  alpn_test(vec!["server-proto".to_string(), "client-proto".to_string()],
            vec!["client-proto".to_string(), "server-proto".to_string()],
            Some("server-proto".to_string()));

  // case sensitive
  alpn_test(vec!["PROTO".to_string()],
            vec!["proto".to_string()],
            None);
}

fn check_read(reader: &mut io::Read, bytes: &[u8]) {
  let mut buf = Vec::new();
  assert_eq!(bytes.len(), reader.read_to_end(&mut buf).unwrap());
  assert_eq!(bytes.to_vec(), buf);
}

#[test]
fn buffered_client_data_sent() {
  let client_config = make_client_config();
  let server_config = make_server_config();
  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  assert_eq!(5, client.write(b"hello").unwrap());
  
  do_handshake(&mut client, &mut server);
  transfer(&mut client, &mut server);
  server.process_new_packets().unwrap();
  
  check_read(&mut server, b"hello");
}

#[test]
fn buffered_server_data_sent() {
  let client_config = make_client_config();
  let server_config = make_server_config();
  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  assert_eq!(5, server.write(b"hello").unwrap());
  
  do_handshake(&mut client, &mut server);
  transfer(&mut server, &mut client);
  client.process_new_packets().unwrap();
  
  check_read(&mut client, b"hello");
}

#[test]
fn buffered_both_data_sent() {
  let client_config = make_client_config();
  let server_config = make_server_config();
  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  assert_eq!(12, server.write(b"from-server!").unwrap());
  assert_eq!(12, client.write(b"from-client!").unwrap());
  
  do_handshake(&mut client, &mut server);
  
  transfer(&mut server, &mut client);
  client.process_new_packets().unwrap();
  transfer(&mut client, &mut server);
  server.process_new_packets().unwrap();

  check_read(&mut client, b"from-server!");
  check_read(&mut server, b"from-client!");
}

#[test]
fn client_can_get_server_cert() {
  let client_config = make_client_config();
  let server_config = make_server_config();
  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  do_handshake(&mut client, &mut server);

  let certs = client.get_peer_certificates();
  assert_eq!(certs, Some(get_chain()));
}

#[test]
fn server_can_get_client_cert() {
  let mut client_config = make_client_config();
  let mut server_config = make_server_config();

  server_config.set_client_auth_roots(get_chain(), true);
  client_config.set_single_client_cert(get_chain(), get_key());

  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  do_handshake(&mut client, &mut server);

  let certs = server.get_peer_certificates();
  assert_eq!(certs, Some(get_chain()));
}

fn check_read_and_close(reader: &mut io::Read, expect: &[u8]) {
  let mut buf = Vec::new();
  buf.resize(expect.len(), 0u8);
  assert_eq!(expect.len(), reader.read(&mut buf).unwrap());
  assert_eq!(expect.to_vec(), buf);

  let err = reader.read(&mut buf);
  assert!(err.is_err());
  assert_eq!(err.err().unwrap().kind(), io::ErrorKind::ConnectionAborted);
}

#[test]
fn server_close_notify() {
  let mut client_config = make_client_config();
  let mut server_config = make_server_config();

  server_config.set_client_auth_roots(get_chain(), true);
  client_config.set_single_client_cert(get_chain(), get_key());

  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  do_handshake(&mut client, &mut server);

  // check that alerts don't overtake appdata
  assert_eq!(12, server.write(b"from-server!").unwrap());
  assert_eq!(12, client.write(b"from-client!").unwrap());
  server.send_close_notify();

  transfer(&mut server, &mut client);
  client.process_new_packets().unwrap();
  check_read_and_close(&mut client, b"from-server!");

  transfer(&mut client, &mut server);
  server.process_new_packets().unwrap();
  check_read(&mut server, b"from-client!");
}

#[test]
fn client_close_notify() {
  let mut client_config = make_client_config();
  let mut server_config = make_server_config();

  server_config.set_client_auth_roots(get_chain(), true);
  client_config.set_single_client_cert(get_chain(), get_key());

  let mut client = ClientSession::new(&Arc::new(client_config), "localhost");
  let mut server = ServerSession::new(&Arc::new(server_config));

  do_handshake(&mut client, &mut server);

  // check that alerts don't overtake appdata
  assert_eq!(12, server.write(b"from-server!").unwrap());
  assert_eq!(12, client.write(b"from-client!").unwrap());
  client.send_close_notify();

  transfer(&mut client, &mut server);
  server.process_new_packets().unwrap();
  check_read_and_close(&mut server, b"from-client!");

  transfer(&mut server, &mut client);
  client.process_new_packets().unwrap();
  check_read(&mut client, b"from-server!");
}