rustls-openssl-post-quantum 0.1.0

//! This is a modified version of the rustls-post-quantum example.
//!
//! It requires OpenSSL 3.0 or later, and oqsprovider to be installed.
//!
//! It sends a HTTP request to pq.cloudflareresearch.com and prints the response to
//! stdout.  Observe in that output: `kex=X25519MLKEM768`
//!
//! Note that `unwrap()` is used to deal with networking errors; this is not something
//! that is sensible outside of example code.
use rustls_openssl::custom_provider;
use rustls_openssl_post_quantum::X25519MLKEM768;
use std::io::{stdout, Read, Write};
use std::net::TcpStream;
use std::sync::Arc;

fn main() {
    use openssl::error::ErrorStack;
    use rustls_openssl::ALL_CIPHER_SUITES;

    let _default_provider =
        openssl::provider::Provider::load(None, "default").expect("Failed to load OQS provider.");
    let _provider = openssl::provider::Provider::load(None, "oqsprovider")
        .expect("Failed to load OQS provider.");
    // OSSL_PROVIDER_load seems to leave errors on the stack, even
    // when it succeeds.
    let _ = ErrorStack::get();

    env_logger::init();
    let suites = ALL_CIPHER_SUITES.to_vec();
    custom_provider(suites, vec![X25519MLKEM768])
        .install_default()
        .unwrap();

    let root_store = rustls::RootCertStore {
        roots: webpki_roots::TLS_SERVER_ROOTS.into(),
    };

    let config = rustls::ClientConfig::builder()
        .with_root_certificates(root_store)
        .with_no_client_auth();

    let server_name = "pq.cloudflareresearch.com".try_into().unwrap();
    let mut conn = rustls::ClientConnection::new(Arc::new(config), server_name).unwrap();
    let mut sock = TcpStream::connect("pq.cloudflareresearch.com:443").unwrap();
    let mut tls = rustls::Stream::new(&mut conn, &mut sock);
    tls.write_all(
        concat!(
            "GET /cdn-cgi/trace HTTP/1.0\r\n",
            "Host: pq.cloudflareresearch.com\r\n",
            "Connection: close\r\n",
            "Accept-Encoding: identity\r\n",
            "\r\n"
        )
        .as_bytes(),
    )
    .unwrap();
    let ciphersuite = tls.conn.negotiated_cipher_suite().unwrap();
    writeln!(
        &mut std::io::stderr(),
        "Current ciphersuite: {:?}",
        ciphersuite.suite()
    )
    .unwrap();
    let kx_group = tls.conn.negotiated_key_exchange_group().unwrap();
    writeln!(
        &mut std::io::stderr(),
        "Current key exchange group: {kx_group:?}",
    )
    .unwrap();
    let mut plaintext = Vec::new();
    tls.read_to_end(&mut plaintext).unwrap();
    stdout().write_all(&plaintext).unwrap();
}