_ 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 mod base32;
  13 #[cfg(feature = "validation")]
  14 mod crypto;
  15 #[cfg(feature = "validation")]
  16 pub mod validation;
  17
  18 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  19 use tokio_crate as tokio;
  20
  21 #[cfg(feature = "build_server")]
  22 #[tokio::main]
  23 async fn main() {
  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");
  29
  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;
  33 }
  34
  35 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  36 mod imp {
  37         use super::*;
  38
  39         use rr::Name;
  40         use query::*;
  41
  42         use std::net::SocketAddr;
  43
  44         use tokio::net::TcpListener;
  45         use tokio::io::{AsyncReadExt, AsyncWriteExt};
  46
  47         pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
  48                 loop {
  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];
  54                                         let mut buf_pos = 0;
  55                                         'read_req: loop {
  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 };
  58                                                 match read_res {
  59                                                         Ok(0) => return,
  60                                                         Ok(len) => {
  61                                                                 buf_pos += len;
  62                                                                 for window in buf[..buf_pos].windows(2) {
  63                                                                         if window == b"\r\n" { break 'read_req; }
  64                                                                 }
  65                                                         }
  66                                                         Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
  67                                                         Err(_) => return,
  68                                                 }
  69                                         }
  70                                         let request;
  71                                         if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
  72                                                 if let Some((r, _)) = s.split_once("\r\n") {
  73                                                         request = r;
  74                                                 } else {
  75                                                         debug_assert!(false);
  76                                                         break 'ret_err;
  77                                                 }
  78                                         } else {
  79                                                 break 'ret_err;
  80                                         }
  81
  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; }
  90
  91                                         const PATH_PFX: &'static str = "/dnssecproof?";
  92                                         if !path.starts_with(PATH_PFX) {
  93                                                 response = ("404 Not Found", "Not Found");
  94                                                 break 'ret_err;
  95                                         }
  96
  97                                         let (mut d, mut t) = ("", "");
  98                                         for arg in path[PATH_PFX.len()..].split("&") {
  99                                                 if let Some((k, v)) = arg.split_once("=") {
 100                                                         if k == "d" {
 101                                                                 d = v;
 102                                                         } else if k == "t" {
 103                                                                 t = v;
 104                                                         }
 105                                                 } else { break 'ret_err; }
 106                                         }
 107
 108                                         if d == "" || t == "" {
 109                                                 response.1 = "Missing d or t URI parameters";
 110                                                 break 'ret_err;
 111                                         }
 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 .";
 114                                                 break 'ret_err;
 115                                         };
 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,
 121                                                 _ => break 'ret_err,
 122                                         };
 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");
 125                                                 break 'ret_err;
 126                                         };
 127
 128                                         let _ = socket.write_all(
 129                                                 format!(
 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
 132                                                 ).as_bytes()
 133                                         ).await;
 134                                         let _ = socket.write_all(&proof).await;
 135                                         return;
 136                                 }
 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,
 140                                 ).as_bytes()).await;
 141                         });
 142                 }
 143         }
 144 }
 145
 146 #[cfg(all(feature = "tokio", feature = "validation", test))]
 147 mod test {
 148         use super::*;
 149
 150         use crate::ser::parse_rr_stream;
 151         use crate::validation::verify_rr_stream;
 152
 153         use minreq;
 154
 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"
 163                 ).send().unwrap();
 164
 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);
 169         }
 170
 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"
 179                 ).send().unwrap();
 180
 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);
 185         }
 186
 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"
 195                 ).send().unwrap();
 196
 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);
 201         }
 202 }