_ 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 extern crate alloc;
   6
   7 pub mod rr;
   8 pub mod ser;
   9 pub mod query;
  10
  11 #[cfg(feature = "validation")]
  12 pub mod validation;
  13
  14 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  15 use tokio_crate as tokio;
  16
  17 #[cfg(feature = "build_server")]
  18 #[tokio::main]
  19 async fn main() {
  20         let resolver_sockaddr = std::env::var("RESOLVER")
  21                 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
  22                 .parse().expect("RESOLVER was not a valid socket address");
  23         let bind_addr = std::env::var("BIND")
  24                 .expect("Please set the BIND env variable to a socket address to listen on");
  25
  26         let listener = tokio::net::TcpListener::bind(bind_addr).await
  27                 .expect("Failed to bind to socket");
  28         imp::run_server(listener, resolver_sockaddr).await;
  29 }
  30
  31 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  32 mod imp {
  33         use super::*;
  34
  35         use rr::Name;
  36         use query::*;
  37
  38         use std::net::SocketAddr;
  39
  40         use tokio::net::TcpListener;
  41         use tokio::io::{AsyncReadExt, AsyncWriteExt};
  42
  43         pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
  44                 loop {
  45                         let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
  46                         tokio::spawn(async move {
  47                                 let mut response = ("400 Bad Request", "Bad Request");
  48                                 'ret_err: loop { // goto label
  49                                         let mut buf = [0; 4096];
  50                                         let mut buf_pos = 0;
  51                                         'read_req: loop {
  52                                                 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
  53                                                 let read_res = { socket.read(&mut buf[buf_pos..]).await };
  54                                                 match read_res {
  55                                                         Ok(0) => return,
  56                                                         Ok(len) => {
  57                                                                 buf_pos += len;
  58                                                                 for window in buf[..buf_pos].windows(2) {
  59                                                                         if window == b"\r\n" { break 'read_req; }
  60                                                                 }
  61                                                         }
  62                                                         Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
  63                                                         Err(_) => return,
  64                                                 }
  65                                         }
  66                                         let request;
  67                                         if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
  68                                                 if let Some((r, _)) = s.split_once("\r\n") {
  69                                                         request = r;
  70                                                 } else {
  71                                                         debug_assert!(false);
  72                                                         break 'ret_err;
  73                                                 }
  74                                         } else {
  75                                                 break 'ret_err;
  76                                         }
  77
  78                                         let mut parts = request.split(" ");
  79                                         let (verb, path, http_vers);
  80                                         if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
  81                                         if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
  82                                         if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
  83                                         if parts.next().is_some() { break; }
  84                                         if verb != "GET" { break; }
  85                                         if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
  86
  87                                         const PATH_PFX: &'static str = "/dnssecproof?";
  88                                         if !path.starts_with(PATH_PFX) {
  89                                                 response = ("404 Not Found", "Not Found");
  90                                                 break 'ret_err;
  91                                         }
  92
  93                                         let (mut d, mut t) = ("", "");
  94                                         for arg in path[PATH_PFX.len()..].split("&") {
  95                                                 if let Some((k, v)) = arg.split_once("=") {
  96                                                         if k == "d" {
  97                                                                 d = v;
  98                                                         } else if k == "t" {
  99                                                                 t = v;
 100                                                         }
 101                                                 } else { break 'ret_err; }
 102                                         }
 103
 104                                         if d == "" || t == "" {
 105                                                 response.1 = "Missing d or t URI parameters";
 106                                                 break 'ret_err;
 107                                         }
 108                                         let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
 109                                                 response.1 = "Failed to parse domain, make sure it ends with .";
 110                                                 break 'ret_err;
 111                                         };
 112                                         let proof_res = match t.to_ascii_uppercase().as_str() {
 113                                                 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
 114                                                 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
 115                                                 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
 116                                                 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
 117                                                 _ => break 'ret_err,
 118                                         };
 119                                         let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
 120                                                 response = ("404 Not Found", "Failed to generate proof for given domain");
 121                                                 break 'ret_err;
 122                                         };
 123
 124                                         let _ = socket.write_all(
 125                                                 format!(
 126                                                         "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",
 127                                                         proof.len(), cache_ttl, cache_ttl
 128                                                 ).as_bytes()
 129                                         ).await;
 130                                         let _ = socket.write_all(&proof).await;
 131                                         return;
 132                                 }
 133                                 let _ = socket.write_all(format!(
 134                                         "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
 135                                         response.0, response.1.len(), response.1,
 136                                 ).as_bytes()).await;
 137                         });
 138                 }
 139         }
 140 }
 141
 142 #[cfg(all(feature = "tokio", feature = "validation", test))]
 143 mod test {
 144         use super::*;
 145
 146         use crate::validation::{parse_rr_stream, verify_rr_stream};
 147
 148         use minreq;
 149
 150         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 151         async fn test_lookup() {
 152                 let ns = "8.8.8.8:53".parse().unwrap();
 153                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
 154                         .expect("Failed to bind to socket");
 155                 tokio::spawn(imp::run_server(listener, ns));
 156                 let resp = minreq::get(
 157                         "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
 158                 ).send().unwrap();
 159
 160                 assert_eq!(resp.status_code, 200);
 161                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 162                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 163                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 164         }
 165
 166         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 167         async fn test_lookup_a() {
 168                 let ns = "4.4.4.4:53".parse().unwrap();
 169                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
 170                         .expect("Failed to bind to socket");
 171                 tokio::spawn(imp::run_server(listener, ns));
 172                 let resp = minreq::get(
 173                         "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
 174                 ).send().unwrap();
 175
 176                 assert_eq!(resp.status_code, 200);
 177                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 178                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 179                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 180         }
 181
 182         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 183         async fn test_lookup_tlsa() {
 184                 let ns = "1.1.1.1:53".parse().unwrap();
 185                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
 186                         .expect("Failed to bind to socket");
 187                 tokio::spawn(imp::run_server(listener, ns));
 188                 let resp = minreq::get(
 189                         "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
 190                 ).send().unwrap();
 191
 192                 assert_eq!(resp.status_code, 200);
 193                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 194                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 195                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 196         }
 197 }