1 //! A simple tokio-based HTTP server which serves DNSSEC proofs in RFC 9102 format.
5 // const_slice_from_raw_parts was stabilized in 1.64, however we support building on 1.63 as well.
6 // Luckily, it seems to work fine in 1.63 with the feature flag (and RUSTC_BOOTSTRAP=1) enabled.
7 #![cfg_attr(all(feature = "validation", rust_1_63), feature(const_slice_from_raw_parts))]
9 #![allow(clippy::new_without_default)] // why is this even a lint
10 #![allow(clippy::result_unit_err)] // Why in the hell is this a lint?
11 #![allow(clippy::get_first)] // Sometimes this improves readability
12 #![allow(clippy::needless_lifetimes)] // lifetimes improve readability
13 #![allow(clippy::needless_borrow)] // borrows indicate read-only/non-move
14 #![allow(clippy::too_many_arguments)] // sometimes we don't have an option
15 #![allow(clippy::identity_op)] // sometimes identities improve readability for repeated actions
16 #![allow(clippy::erasing_op)] // sometimes identities improve readability for repeated actions
24 #[cfg(feature = "validation")]
26 #[cfg(feature = "validation")]
28 #[cfg(feature = "validation")]
31 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
32 use tokio_crate as tokio;
34 #[cfg(feature = "build_server")]
37 let resolver_sockaddr = std::env::var("RESOLVER")
38 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
39 .parse().expect("RESOLVER was not a valid socket address");
40 let bind_addr = std::env::var("BIND")
41 .expect("Please set the BIND env variable to a socket address to listen on");
43 let listener = tokio::net::TcpListener::bind(bind_addr).await
44 .expect("Failed to bind to socket");
45 imp::run_server(listener, resolver_sockaddr).await;
48 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
55 use std::net::SocketAddr;
57 use tokio::net::TcpListener;
58 use tokio::io::{AsyncReadExt, AsyncWriteExt};
60 pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
62 let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
63 tokio::spawn(async move {
64 let mut response = ("400 Bad Request", "Bad Request");
65 'ret_err: loop { // goto label
66 let mut buf = [0; 4096];
69 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
70 let read_res = { socket.read(&mut buf[buf_pos..]).await };
75 for window in buf[..buf_pos].windows(2) {
76 if window == b"\r\n" { break 'read_req; }
79 Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
84 if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
85 if let Some((r, _)) = s.split_once("\r\n") {
95 let mut parts = request.split(" ");
96 let (verb, path, http_vers);
97 if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
98 if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
99 if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
100 if parts.next().is_some() { break; }
101 if verb != "GET" { break; }
102 if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
104 const PATH_PFX: &'static str = "/dnssecproof?";
105 if !path.starts_with(PATH_PFX) {
106 response = ("404 Not Found", "Not Found");
110 let (mut d, mut t) = ("", "");
111 for arg in path[PATH_PFX.len()..].split("&") {
112 if let Some((k, v)) = arg.split_once("=") {
118 } else { break 'ret_err; }
121 if d == "" || t == "" {
122 response.1 = "Missing d or t URI parameters";
125 let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
126 response.1 = "Failed to parse domain, make sure it ends with .";
129 let proof_res = match t.to_ascii_uppercase().as_str() {
130 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
131 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
132 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
133 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
136 let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
137 response = ("404 Not Found", "Failed to generate proof for given domain");
141 let _ = socket.write_all(
143 "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",
144 proof.len(), cache_ttl, cache_ttl
147 let _ = socket.write_all(&proof).await;
150 let _ = socket.write_all(format!(
151 "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
152 response.0, response.1.len(), response.1,
159 #[cfg(all(feature = "tokio", feature = "validation", test))]
163 use crate::ser::parse_rr_stream;
164 use crate::validation::verify_rr_stream;
168 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
169 async fn test_lookup() {
170 let ns = "8.8.8.8:53".parse().unwrap();
171 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
172 .expect("Failed to bind to socket");
173 tokio::spawn(imp::run_server(listener, ns));
174 let resp = minreq::get(
175 "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
178 assert_eq!(resp.status_code, 200);
179 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
180 let verified_rrs = verify_rr_stream(&rrs).unwrap();
181 assert_eq!(verified_rrs.verified_rrs.len(), 1);
184 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
185 async fn test_lookup_a() {
186 let ns = "9.9.9.9:53".parse().unwrap();
187 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
188 .expect("Failed to bind to socket");
189 tokio::spawn(imp::run_server(listener, ns));
190 let resp = minreq::get(
191 "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
194 assert_eq!(resp.status_code, 200);
195 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
196 let verified_rrs = verify_rr_stream(&rrs).unwrap();
197 assert!(verified_rrs.verified_rrs.len() >= 1);
200 #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
201 async fn test_lookup_tlsa() {
202 let ns = "1.1.1.1:53".parse().unwrap();
203 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
204 .expect("Failed to bind to socket");
205 tokio::spawn(imp::run_server(listener, ns));
206 let resp = minreq::get(
207 "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
210 assert_eq!(resp.status_code, 200);
211 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
212 let verified_rrs = verify_rr_stream(&rrs).unwrap();
213 assert_eq!(verified_rrs.verified_rrs.len(), 1);