_ 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 crypto;
  13 #[cfg(feature = "validation")]
  14 pub mod validation;
  15
  16 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  17 use tokio_crate as tokio;
  18
  19 #[cfg(feature = "build_server")]
  20 #[tokio::main]
  21 async fn main() {
  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");
  27
  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;
  31 }
  32
  33 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  34 mod imp {
  35         use super::*;
  36
  37         use rr::Name;
  38         use query::*;
  39
  40         use std::net::SocketAddr;
  41
  42         use tokio::net::TcpListener;
  43         use tokio::io::{AsyncReadExt, AsyncWriteExt};
  44
  45         pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
  46                 loop {
  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];
  52                                         let mut buf_pos = 0;
  53                                         'read_req: loop {
  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 };
  56                                                 match read_res {
  57                                                         Ok(0) => return,
  58                                                         Ok(len) => {
  59                                                                 buf_pos += len;
  60                                                                 for window in buf[..buf_pos].windows(2) {
  61                                                                         if window == b"\r\n" { break 'read_req; }
  62                                                                 }
  63                                                         }
  64                                                         Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
  65                                                         Err(_) => return,
  66                                                 }
  67                                         }
  68                                         let request;
  69                                         if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
  70                                                 if let Some((r, _)) = s.split_once("\r\n") {
  71                                                         request = r;
  72                                                 } else {
  73                                                         debug_assert!(false);
  74                                                         break 'ret_err;
  75                                                 }
  76                                         } else {
  77                                                 break 'ret_err;
  78                                         }
  79
  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; }
  88
  89                                         const PATH_PFX: &'static str = "/dnssecproof?";
  90                                         if !path.starts_with(PATH_PFX) {
  91                                                 response = ("404 Not Found", "Not Found");
  92                                                 break 'ret_err;
  93                                         }
  94
  95                                         let (mut d, mut t) = ("", "");
  96                                         for arg in path[PATH_PFX.len()..].split("&") {
  97                                                 if let Some((k, v)) = arg.split_once("=") {
  98                                                         if k == "d" {
  99                                                                 d = v;
 100                                                         } else if k == "t" {
 101                                                                 t = v;
 102                                                         }
 103                                                 } else { break 'ret_err; }
 104                                         }
 105
 106                                         if d == "" || t == "" {
 107                                                 response.1 = "Missing d or t URI parameters";
 108                                                 break 'ret_err;
 109                                         }
 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 .";
 112                                                 break 'ret_err;
 113                                         };
 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,
 119                                                 _ => break 'ret_err,
 120                                         };
 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");
 123                                                 break 'ret_err;
 124                                         };
 125
 126                                         let _ = socket.write_all(
 127                                                 format!(
 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
 130                                                 ).as_bytes()
 131                                         ).await;
 132                                         let _ = socket.write_all(&proof).await;
 133                                         return;
 134                                 }
 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,
 138                                 ).as_bytes()).await;
 139                         });
 140                 }
 141         }
 142 }
 143
 144 #[cfg(all(feature = "tokio", feature = "validation", test))]
 145 mod test {
 146         use super::*;
 147
 148         use crate::ser::parse_rr_stream;
 149         use crate::validation::verify_rr_stream;
 150
 151         use minreq;
 152
 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"
 161                 ).send().unwrap();
 162
 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);
 167         }
 168
 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"
 177                 ).send().unwrap();
 178
 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);
 183         }
 184
 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"
 193                 ).send().unwrap();
 194
 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);
 199         }
 200 }