_ 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(all(feature = "validation", rust_1_63), feature(const_slice_from_raw_parts))]
   8
   9 #![allow(clippy::new_without_default)] // why is this even a lint
  10 #![allow(clippy::result_unit_err)] // Why in the hell is this a lint?
  11 #![allow(clippy::get_first)] // Sometimes this improves readability
  12 #![allow(clippy::needless_lifetimes)] // lifetimes improve readability
  13 #![allow(clippy::needless_borrow)] // borrows indicate read-only/non-move
  14 #![allow(clippy::too_many_arguments)] // sometimes we don't have an option
  15 #![allow(clippy::identity_op)] // sometimes identities improve readability for repeated actions
  16 #![allow(clippy::erasing_op)] // sometimes identities improve readability for repeated actions
  17
  18 extern crate alloc;
  19
  20 pub mod rr;
  21 pub mod ser;
  22 pub mod query;
  23
  24 #[cfg(feature = "validation")]
  25 mod base32;
  26 #[cfg(feature = "validation")]
  27 mod crypto;
  28 #[cfg(feature = "validation")]
  29 pub mod validation;
  30
  31 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  32 use tokio_crate as tokio;
  33
  34 #[cfg(feature = "build_server")]
  35 #[tokio::main]
  36 async fn main() {
  37         let resolver_sockaddr = std::env::var("RESOLVER")
  38                 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
  39                 .parse().expect("RESOLVER was not a valid socket address");
  40         let bind_addr = std::env::var("BIND")
  41                 .expect("Please set the BIND env variable to a socket address to listen on");
  42
  43         let listener = tokio::net::TcpListener::bind(bind_addr).await
  44                 .expect("Failed to bind to socket");
  45         imp::run_server(listener, resolver_sockaddr).await;
  46 }
  47
  48 #[cfg(not(feature = "build_server"))]
  49 fn main() { panic!("You need to enable the `build_server` feature to use the built-in server"); }
  50
  51 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  52 mod imp {
  53         use super::*;
  54
  55         use rr::Name;
  56         use query::*;
  57
  58         use std::net::SocketAddr;
  59
  60         use tokio::net::TcpListener;
  61         use tokio::io::{AsyncReadExt, AsyncWriteExt};
  62
  63         pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
  64                 loop {
  65                         let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
  66                         tokio::spawn(async move {
  67                                 let mut response = ("400 Bad Request", "Bad Request");
  68                                 'ret_err: loop { // goto label
  69                                         let mut buf = [0; 4096];
  70                                         let mut buf_pos = 0;
  71                                         'read_req: loop {
  72                                                 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
  73                                                 let read_res = { socket.read(&mut buf[buf_pos..]).await };
  74                                                 match read_res {
  75                                                         Ok(0) => return,
  76                                                         Ok(len) => {
  77                                                                 buf_pos += len;
  78                                                                 for window in buf[..buf_pos].windows(2) {
  79                                                                         if window == b"\r\n" { break 'read_req; }
  80                                                                 }
  81                                                         }
  82                                                         Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
  83                                                         Err(_) => return,
  84                                                 }
  85                                         }
  86                                         let request;
  87                                         if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
  88                                                 if let Some((r, _)) = s.split_once("\r\n") {
  89                                                         request = r;
  90                                                 } else {
  91                                                         debug_assert!(false);
  92                                                         break 'ret_err;
  93                                                 }
  94                                         } else {
  95                                                 break 'ret_err;
  96                                         }
  97
  98                                         let mut parts = request.split(" ");
  99                                         let (verb, path, http_vers);
 100                                         if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
 101                                         if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
 102                                         if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
 103                                         if parts.next().is_some() { break; }
 104                                         if verb != "GET" { break; }
 105                                         if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
 106
 107                                         const PATH_PFX: &'static str = "/dnssecproof?";
 108                                         if !path.starts_with(PATH_PFX) {
 109                                                 response = ("404 Not Found", "Not Found");
 110                                                 break 'ret_err;
 111                                         }
 112
 113                                         let (mut d, mut t) = ("", "");
 114                                         for arg in path[PATH_PFX.len()..].split("&") {
 115                                                 if let Some((k, v)) = arg.split_once("=") {
 116                                                         if k == "d" {
 117                                                                 d = v;
 118                                                         } else if k == "t" {
 119                                                                 t = v;
 120                                                         }
 121                                                 } else { break 'ret_err; }
 122                                         }
 123
 124                                         if d == "" || t == "" {
 125                                                 response.1 = "Missing d or t URI parameters";
 126                                                 break 'ret_err;
 127                                         }
 128                                         let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
 129                                                 response.1 = "Failed to parse domain, make sure it ends with .";
 130                                                 break 'ret_err;
 131                                         };
 132                                         let proof_res = match t.to_ascii_uppercase().as_str() {
 133                                                 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
 134                                                 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
 135                                                 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
 136                                                 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
 137                                                 _ => break 'ret_err,
 138                                         };
 139                                         let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
 140                                                 response = ("404 Not Found", "Failed to generate proof for given domain");
 141                                                 break 'ret_err;
 142                                         };
 143
 144                                         let _ = socket.write_all(
 145                                                 format!(
 146                                                         "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",
 147                                                         proof.len(), cache_ttl, cache_ttl
 148                                                 ).as_bytes()
 149                                         ).await;
 150                                         let _ = socket.write_all(&proof).await;
 151                                         return;
 152                                 }
 153                                 let _ = socket.write_all(format!(
 154                                         "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
 155                                         response.0, response.1.len(), response.1,
 156                                 ).as_bytes()).await;
 157                         });
 158                 }
 159         }
 160 }
 161
 162 #[cfg(all(feature = "tokio", feature = "validation", test))]
 163 mod test {
 164         use super::*;
 165
 166         use crate::ser::parse_rr_stream;
 167         use crate::validation::verify_rr_stream;
 168
 169         use minreq;
 170
 171         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 172         async fn test_lookup() {
 173                 let ns = "8.8.8.8:53".parse().unwrap();
 174                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
 175                         .expect("Failed to bind to socket");
 176                 tokio::spawn(imp::run_server(listener, ns));
 177                 let resp = minreq::get(
 178                         "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
 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_eq!(verified_rrs.verified_rrs.len(), 1);
 185         }
 186
 187         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 188         async fn test_lookup_a() {
 189                 let ns = "9.9.9.9:53".parse().unwrap();
 190                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
 191                         .expect("Failed to bind to socket");
 192                 tokio::spawn(imp::run_server(listener, ns));
 193                 let resp = minreq::get(
 194                         "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
 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!(verified_rrs.verified_rrs.len() >= 1);
 201         }
 202
 203         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 204         async fn test_lookup_tlsa() {
 205                 let ns = "1.1.1.1:53".parse().unwrap();
 206                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
 207                         .expect("Failed to bind to socket");
 208                 tokio::spawn(imp::run_server(listener, ns));
 209                 let resp = minreq::get(
 210                         "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
 211                 ).send().unwrap();
 212
 213                 assert_eq!(resp.status_code, 200);
 214                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 215                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 216                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 217         }
 218 }