1 //! A simple tokio-based HTTP server which serves DNSSEC proofs in RFC 9102 format.
11 #[cfg(feature = "validation")]
13 #[cfg(feature = "validation")]
15 #[cfg(feature = "validation")]
18 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
19 use tokio_crate as tokio;
21 #[cfg(feature = "build_server")]
24 let resolver_sockaddr = std::env::var("RESOLVER")
25 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
26 .parse().expect("RESOLVER was not a valid socket address");
27 let bind_addr = std::env::var("BIND")
28 .expect("Please set the BIND env variable to a socket address to listen on");
30 let listener = tokio::net::TcpListener::bind(bind_addr).await
31 .expect("Failed to bind to socket");
32 imp::run_server(listener, resolver_sockaddr).await;
35 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
42 use std::net::SocketAddr;
44 use tokio::net::TcpListener;
45 use tokio::io::{AsyncReadExt, AsyncWriteExt};
47 pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
49 let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
50 tokio::spawn(async move {
51 let mut response = ("400 Bad Request", "Bad Request");
52 'ret_err: loop { // goto label
53 let mut buf = [0; 4096];
56 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
57 let read_res = { socket.read(&mut buf[buf_pos..]).await };
62 for window in buf[..buf_pos].windows(2) {
63 if window == b"\r\n" { break 'read_req; }
66 Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
71 if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
72 if let Some((r, _)) = s.split_once("\r\n") {
82 let mut parts = request.split(" ");
83 let (verb, path, http_vers);
84 if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
85 if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
86 if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
87 if parts.next().is_some() { break; }
88 if verb != "GET" { break; }
89 if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
91 const PATH_PFX: &'static str = "/dnssecproof?";
92 if !path.starts_with(PATH_PFX) {
93 response = ("404 Not Found", "Not Found");
97 let (mut d, mut t) = ("", "");
98 for arg in path[PATH_PFX.len()..].split("&") {
99 if let Some((k, v)) = arg.split_once("=") {
105 } else { break 'ret_err; }
108 if d == "" || t == "" {
109 response.1 = "Missing d or t URI parameters";
112 let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
113 response.1 = "Failed to parse domain, make sure it ends with .";
116 let proof_res = match t.to_ascii_uppercase().as_str() {
117 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
118 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
119 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
120 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
123 let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
124 response = ("404 Not Found", "Failed to generate proof for given domain");
128 let _ = socket.write_all(
130 "HTTP/1.1 200 OK\r\nContent-Length: {}\r\nContent-Type: application/octet-stream\r\nCache-Control: public, max-age={}, s-maxage={}\r\nAccess-Control-Allow-Origin: *\r\n\r\n",
131 proof.len(), cache_ttl, cache_ttl
134 let _ = socket.write_all(&proof).await;
137 let _ = socket.write_all(format!(
138 "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
139 response.0, response.1.len(), response.1,
146 #[cfg(all(feature = "tokio", feature = "validation", test))]
150 use crate::ser::parse_rr_stream;
151 use crate::validation::verify_rr_stream;
155 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
156 async fn test_lookup() {
157 let ns = "8.8.8.8:53".parse().unwrap();
158 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
159 .expect("Failed to bind to socket");
160 tokio::spawn(imp::run_server(listener, ns));
161 let resp = minreq::get(
162 "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
165 assert_eq!(resp.status_code, 200);
166 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
167 let verified_rrs = verify_rr_stream(&rrs).unwrap();
168 assert_eq!(verified_rrs.verified_rrs.len(), 1);
171 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
172 async fn test_lookup_a() {
173 let ns = "9.9.9.9:53".parse().unwrap();
174 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
175 .expect("Failed to bind to socket");
176 tokio::spawn(imp::run_server(listener, ns));
177 let resp = minreq::get(
178 "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
181 assert_eq!(resp.status_code, 200);
182 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
183 let verified_rrs = verify_rr_stream(&rrs).unwrap();
184 assert!(verified_rrs.verified_rrs.len() >= 1);
187 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
188 async fn test_lookup_tlsa() {
189 let ns = "1.1.1.1:53".parse().unwrap();
190 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
191 .expect("Failed to bind to socket");
192 tokio::spawn(imp::run_server(listener, ns));
193 let resp = minreq::get(
194 "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
197 assert_eq!(resp.status_code, 200);
198 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
199 let verified_rrs = verify_rr_stream(&rrs).unwrap();
200 assert_eq!(verified_rrs.verified_rrs.len(), 1);