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