_ 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(feature = "validation", allow(stable_features))]
   8 #![cfg_attr(feature = "validation", feature(const_slice_from_raw_parts))]
   9
  10 extern crate alloc;
  11
  12 pub mod rr;
  13 pub mod ser;
  14 pub mod query;
  15
  16 #[cfg(feature = "validation")]
  17 mod base32;
  18 #[cfg(feature = "validation")]
  19 mod crypto;
  20 #[cfg(feature = "validation")]
  21 pub mod validation;
  22
  23 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  24 use tokio_crate as tokio;
  25
  26 #[cfg(feature = "build_server")]
  27 #[tokio::main]
  28 async fn main() {
  29         let resolver_sockaddr = std::env::var("RESOLVER")
  30                 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
  31                 .parse().expect("RESOLVER was not a valid socket address");
  32         let bind_addr = std::env::var("BIND")
  33                 .expect("Please set the BIND env variable to a socket address to listen on");
  34
  35         let listener = tokio::net::TcpListener::bind(bind_addr).await
  36                 .expect("Failed to bind to socket");
  37         imp::run_server(listener, resolver_sockaddr).await;
  38 }
  39
  40 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  41 mod imp {
  42         use super::*;
  43
  44         use rr::Name;
  45         use query::*;
  46
  47         use std::net::SocketAddr;
  48
  49         use tokio::net::TcpListener;
  50         use tokio::io::{AsyncReadExt, AsyncWriteExt};
  51
  52         pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
  53                 loop {
  54                         let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
  55                         tokio::spawn(async move {
  56                                 let mut response = ("400 Bad Request", "Bad Request");
  57                                 'ret_err: loop { // goto label
  58                                         let mut buf = [0; 4096];
  59                                         let mut buf_pos = 0;
  60                                         'read_req: loop {
  61                                                 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
  62                                                 let read_res = { socket.read(&mut buf[buf_pos..]).await };
  63                                                 match read_res {
  64                                                         Ok(0) => return,
  65                                                         Ok(len) => {
  66                                                                 buf_pos += len;
  67                                                                 for window in buf[..buf_pos].windows(2) {
  68                                                                         if window == b"\r\n" { break 'read_req; }
  69                                                                 }
  70                                                         }
  71                                                         Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
  72                                                         Err(_) => return,
  73                                                 }
  74                                         }
  75                                         let request;
  76                                         if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
  77                                                 if let Some((r, _)) = s.split_once("\r\n") {
  78                                                         request = r;
  79                                                 } else {
  80                                                         debug_assert!(false);
  81                                                         break 'ret_err;
  82                                                 }
  83                                         } else {
  84                                                 break 'ret_err;
  85                                         }
  86
  87                                         let mut parts = request.split(" ");
  88                                         let (verb, path, http_vers);
  89                                         if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
  90                                         if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
  91                                         if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
  92                                         if parts.next().is_some() { break; }
  93                                         if verb != "GET" { break; }
  94                                         if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
  95
  96                                         const PATH_PFX: &'static str = "/dnssecproof?";
  97                                         if !path.starts_with(PATH_PFX) {
  98                                                 response = ("404 Not Found", "Not Found");
  99                                                 break 'ret_err;
 100                                         }
 101
 102                                         let (mut d, mut t) = ("", "");
 103                                         for arg in path[PATH_PFX.len()..].split("&") {
 104                                                 if let Some((k, v)) = arg.split_once("=") {
 105                                                         if k == "d" {
 106                                                                 d = v;
 107                                                         } else if k == "t" {
 108                                                                 t = v;
 109                                                         }
 110                                                 } else { break 'ret_err; }
 111                                         }
 112
 113                                         if d == "" || t == "" {
 114                                                 response.1 = "Missing d or t URI parameters";
 115                                                 break 'ret_err;
 116                                         }
 117                                         let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
 118                                                 response.1 = "Failed to parse domain, make sure it ends with .";
 119                                                 break 'ret_err;
 120                                         };
 121                                         let proof_res = match t.to_ascii_uppercase().as_str() {
 122                                                 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
 123                                                 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
 124                                                 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
 125                                                 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
 126                                                 _ => break 'ret_err,
 127                                         };
 128                                         let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
 129                                                 response = ("404 Not Found", "Failed to generate proof for given domain");
 130                                                 break 'ret_err;
 131                                         };
 132
 133                                         let _ = socket.write_all(
 134                                                 format!(
 135                                                         "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",
 136                                                         proof.len(), cache_ttl, cache_ttl
 137                                                 ).as_bytes()
 138                                         ).await;
 139                                         let _ = socket.write_all(&proof).await;
 140                                         return;
 141                                 }
 142                                 let _ = socket.write_all(format!(
 143                                         "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
 144                                         response.0, response.1.len(), response.1,
 145                                 ).as_bytes()).await;
 146                         });
 147                 }
 148         }
 149 }
 150
 151 #[cfg(all(feature = "tokio", feature = "validation", test))]
 152 mod test {
 153         use super::*;
 154
 155         use crate::ser::parse_rr_stream;
 156         use crate::validation::verify_rr_stream;
 157
 158         use minreq;
 159
 160         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 161         async fn test_lookup() {
 162                 let ns = "8.8.8.8:53".parse().unwrap();
 163                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
 164                         .expect("Failed to bind to socket");
 165                 tokio::spawn(imp::run_server(listener, ns));
 166                 let resp = minreq::get(
 167                         "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
 168                 ).send().unwrap();
 169
 170                 assert_eq!(resp.status_code, 200);
 171                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 172                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 173                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 174         }
 175
 176         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 177         async fn test_lookup_a() {
 178                 let ns = "9.9.9.9:53".parse().unwrap();
 179                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
 180                         .expect("Failed to bind to socket");
 181                 tokio::spawn(imp::run_server(listener, ns));
 182                 let resp = minreq::get(
 183                         "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
 184                 ).send().unwrap();
 185
 186                 assert_eq!(resp.status_code, 200);
 187                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 188                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 189                 assert!(verified_rrs.verified_rrs.len() >= 1);
 190         }
 191
 192         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 193         async fn test_lookup_tlsa() {
 194                 let ns = "1.1.1.1:53".parse().unwrap();
 195                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
 196                         .expect("Failed to bind to socket");
 197                 tokio::spawn(imp::run_server(listener, ns));
 198                 let resp = minreq::get(
 199                         "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
 200                 ).send().unwrap();
 201
 202                 assert_eq!(resp.status_code, 200);
 203                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 204                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 205                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 206         }
 207 }