git.bitcoin.ninja Git - dnssec-prover/blob - src/http.rs

   1 //! A simple tokio-based HTTP server which serves DNSSEC proofs in RFC 9102 format.
   2
   3 #![deny(missing_docs)]
   4
   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))]
   8
   9 extern crate alloc;
  10
  11 pub mod rr;
  12 pub mod ser;
  13 pub mod query;
  14
  15 #[cfg(feature = "validation")]
  16 mod base32;
  17 #[cfg(feature = "validation")]
  18 mod crypto;
  19 #[cfg(feature = "validation")]
  20 pub mod validation;
  21
  22 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  23 use tokio_crate as tokio;
  24
  25 #[cfg(feature = "build_server")]
  26 #[tokio::main]
  27 async fn main() {
  28         let resolver_sockaddr = std::env::var("RESOLVER")
  29                 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
  30                 .parse().expect("RESOLVER was not a valid socket address");
  31         let bind_addr = std::env::var("BIND")
  32                 .expect("Please set the BIND env variable to a socket address to listen on");
  33
  34         let listener = tokio::net::TcpListener::bind(bind_addr).await
  35                 .expect("Failed to bind to socket");
  36         imp::run_server(listener, resolver_sockaddr).await;
  37 }
  38
  39 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  40 mod imp {
  41         use super::*;
  42
  43         use rr::Name;
  44         use query::*;
  45
  46         use std::net::SocketAddr;
  47
  48         use tokio::net::TcpListener;
  49         use tokio::io::{AsyncReadExt, AsyncWriteExt};
  50
  51         pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
  52                 loop {
  53                         let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
  54                         tokio::spawn(async move {
  55                                 let mut response = ("400 Bad Request", "Bad Request");
  56                                 'ret_err: loop { // goto label
  57                                         let mut buf = [0; 4096];
  58                                         let mut buf_pos = 0;
  59                                         'read_req: loop {
  60                                                 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
  61                                                 let read_res = { socket.read(&mut buf[buf_pos..]).await };
  62                                                 match read_res {
  63                                                         Ok(0) => return,
  64                                                         Ok(len) => {
  65                                                                 buf_pos += len;
  66                                                                 for window in buf[..buf_pos].windows(2) {
  67                                                                         if window == b"\r\n" { break 'read_req; }
  68                                                                 }
  69                                                         }
  70                                                         Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
  71                                                         Err(_) => return,
  72                                                 }
  73                                         }
  74                                         let request;
  75                                         if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
  76                                                 if let Some((r, _)) = s.split_once("\r\n") {
  77                                                         request = r;
  78                                                 } else {
  79                                                         debug_assert!(false);
  80                                                         break 'ret_err;
  81                                                 }
  82                                         } else {
  83                                                 break 'ret_err;
  84                                         }
  85
  86                                         let mut parts = request.split(" ");
  87                                         let (verb, path, http_vers);
  88                                         if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
  89                                         if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
  90                                         if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
  91                                         if parts.next().is_some() { break; }
  92                                         if verb != "GET" { break; }
  93                                         if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
  94
  95                                         const PATH_PFX: &'static str = "/dnssecproof?";
  96                                         if !path.starts_with(PATH_PFX) {
  97                                                 response = ("404 Not Found", "Not Found");
  98                                                 break 'ret_err;
  99                                         }
 100
 101                                         let (mut d, mut t) = ("", "");
 102                                         for arg in path[PATH_PFX.len()..].split("&") {
 103                                                 if let Some((k, v)) = arg.split_once("=") {
 104                                                         if k == "d" {
 105                                                                 d = v;
 106                                                         } else if k == "t" {
 107                                                                 t = v;
 108                                                         }
 109                                                 } else { break 'ret_err; }
 110                                         }
 111
 112                                         if d == "" || t == "" {
 113                                                 response.1 = "Missing d or t URI parameters";
 114                                                 break 'ret_err;
 115                                         }
 116                                         let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
 117                                                 response.1 = "Failed to parse domain, make sure it ends with .";
 118                                                 break 'ret_err;
 119                                         };
 120                                         let proof_res = match t.to_ascii_uppercase().as_str() {
 121                                                 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
 122                                                 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
 123                                                 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
 124                                                 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
 125                                                 _ => break 'ret_err,
 126                                         };
 127                                         let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
 128                                                 response = ("404 Not Found", "Failed to generate proof for given domain");
 129                                                 break 'ret_err;
 130                                         };
 131
 132                                         let _ = socket.write_all(
 133                                                 format!(
 134                                                         "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",
 135                                                         proof.len(), cache_ttl, cache_ttl
 136                                                 ).as_bytes()
 137                                         ).await;
 138                                         let _ = socket.write_all(&proof).await;
 139                                         return;
 140                                 }
 141                                 let _ = socket.write_all(format!(
 142                                         "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
 143                                         response.0, response.1.len(), response.1,
 144                                 ).as_bytes()).await;
 145                         });
 146                 }
 147         }
 148 }
 149
 150 #[cfg(all(feature = "tokio", feature = "validation", test))]
 151 mod test {
 152         use super::*;
 153
 154         use crate::ser::parse_rr_stream;
 155         use crate::validation::verify_rr_stream;
 156
 157         use minreq;
 158
 159         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 160         async fn test_lookup() {
 161                 let ns = "8.8.8.8:53".parse().unwrap();
 162                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
 163                         .expect("Failed to bind to socket");
 164                 tokio::spawn(imp::run_server(listener, ns));
 165                 let resp = minreq::get(
 166                         "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
 167                 ).send().unwrap();
 168
 169                 assert_eq!(resp.status_code, 200);
 170                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 171                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 172                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 173         }
 174
 175         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 176         async fn test_lookup_a() {
 177                 let ns = "9.9.9.9:53".parse().unwrap();
 178                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
 179                         .expect("Failed to bind to socket");
 180                 tokio::spawn(imp::run_server(listener, ns));
 181                 let resp = minreq::get(
 182                         "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
 183                 ).send().unwrap();
 184
 185                 assert_eq!(resp.status_code, 200);
 186                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 187                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 188                 assert!(verified_rrs.verified_rrs.len() >= 1);
 189         }
 190
 191         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 192         async fn test_lookup_tlsa() {
 193                 let ns = "1.1.1.1:53".parse().unwrap();
 194                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
 195                         .expect("Failed to bind to socket");
 196                 tokio::spawn(imp::run_server(listener, ns));
 197                 let resp = minreq::get(
 198                         "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
 199                 ).send().unwrap();
 200
 201                 assert_eq!(resp.status_code, 200);
 202                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 203                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 204                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 205         }
 206 }