1 //! A simple tokio-based HTTP server which serves DNSSEC proofs in RFC 9102 format.
11 #[cfg(feature = "validation")]
13 #[cfg(feature = "validation")]
16 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
17 use tokio_crate as tokio;
19 #[cfg(feature = "build_server")]
22 let resolver_sockaddr = std::env::var("RESOLVER")
23 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
24 .parse().expect("RESOLVER was not a valid socket address");
25 let bind_addr = std::env::var("BIND")
26 .expect("Please set the BIND env variable to a socket address to listen on");
28 let listener = tokio::net::TcpListener::bind(bind_addr).await
29 .expect("Failed to bind to socket");
30 imp::run_server(listener, resolver_sockaddr).await;
33 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
40 use std::net::SocketAddr;
42 use tokio::net::TcpListener;
43 use tokio::io::{AsyncReadExt, AsyncWriteExt};
45 pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
47 let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
48 tokio::spawn(async move {
49 let mut response = ("400 Bad Request", "Bad Request");
50 'ret_err: loop { // goto label
51 let mut buf = [0; 4096];
54 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
55 let read_res = { socket.read(&mut buf[buf_pos..]).await };
60 for window in buf[..buf_pos].windows(2) {
61 if window == b"\r\n" { break 'read_req; }
64 Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
69 if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
70 if let Some((r, _)) = s.split_once("\r\n") {
80 let mut parts = request.split(" ");
81 let (verb, path, http_vers);
82 if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
83 if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
84 if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
85 if parts.next().is_some() { break; }
86 if verb != "GET" { break; }
87 if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
89 const PATH_PFX: &'static str = "/dnssecproof?";
90 if !path.starts_with(PATH_PFX) {
91 response = ("404 Not Found", "Not Found");
95 let (mut d, mut t) = ("", "");
96 for arg in path[PATH_PFX.len()..].split("&") {
97 if let Some((k, v)) = arg.split_once("=") {
103 } else { break 'ret_err; }
106 if d == "" || t == "" {
107 response.1 = "Missing d or t URI parameters";
110 let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
111 response.1 = "Failed to parse domain, make sure it ends with .";
114 let proof_res = match t.to_ascii_uppercase().as_str() {
115 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
116 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
117 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
118 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
121 let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
122 response = ("404 Not Found", "Failed to generate proof for given domain");
126 let _ = socket.write_all(
128 "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",
129 proof.len(), cache_ttl, cache_ttl
132 let _ = socket.write_all(&proof).await;
135 let _ = socket.write_all(format!(
136 "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
137 response.0, response.1.len(), response.1,
144 #[cfg(all(feature = "tokio", feature = "validation", test))]
148 use crate::ser::parse_rr_stream;
149 use crate::validation::verify_rr_stream;
153 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
154 async fn test_lookup() {
155 let ns = "8.8.8.8:53".parse().unwrap();
156 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
157 .expect("Failed to bind to socket");
158 tokio::spawn(imp::run_server(listener, ns));
159 let resp = minreq::get(
160 "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
163 assert_eq!(resp.status_code, 200);
164 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
165 let verified_rrs = verify_rr_stream(&rrs).unwrap();
166 assert_eq!(verified_rrs.verified_rrs.len(), 1);
169 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
170 async fn test_lookup_a() {
171 let ns = "9.9.9.9:53".parse().unwrap();
172 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
173 .expect("Failed to bind to socket");
174 tokio::spawn(imp::run_server(listener, ns));
175 let resp = minreq::get(
176 "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
179 assert_eq!(resp.status_code, 200);
180 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
181 let verified_rrs = verify_rr_stream(&rrs).unwrap();
182 assert!(verified_rrs.verified_rrs.len() >= 1);
185 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
186 async fn test_lookup_tlsa() {
187 let ns = "1.1.1.1:53".parse().unwrap();
188 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
189 .expect("Failed to bind to socket");
190 tokio::spawn(imp::run_server(listener, ns));
191 let resp = minreq::get(
192 "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
195 assert_eq!(resp.status_code, 200);
196 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
197 let verified_rrs = verify_rr_stream(&rrs).unwrap();
198 assert_eq!(verified_rrs.verified_rrs.len(), 1);