_ 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 /// The maximum number of requests we will make when building a proof or the maximum number of
  21 /// [`rr::RRSig`] sets we'll validate records from when validating proofs.
  22 // Note that this is duplicated exactly in src/lib.rs
  23 pub const MAX_PROOF_STEPS: usize = 20;
  24
  25 pub mod rr;
  26 pub mod ser;
  27 pub mod query;
  28
  29 #[cfg(feature = "validation")]
  30 mod base32;
  31 #[cfg(feature = "validation")]
  32 mod crypto;
  33 #[cfg(feature = "validation")]
  34 pub mod validation;
  35
  36 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  37 use tokio_crate as tokio;
  38
  39 #[cfg(feature = "build_server")]
  40 #[tokio::main]
  41 async fn main() {
  42         let resolver_sockaddr = std::env::var("RESOLVER")
  43                 .expect("Please set the RESOLVER env variable to the TCP socket of a recursive DNS resolver")
  44                 .parse().expect("RESOLVER was not a valid socket address");
  45         let bind_addr = std::env::var("BIND")
  46                 .expect("Please set the BIND env variable to a socket address to listen on");
  47
  48         let listener = tokio::net::TcpListener::bind(bind_addr).await
  49                 .expect("Failed to bind to socket");
  50         imp::run_server(listener, resolver_sockaddr).await;
  51 }
  52
  53 #[cfg(not(feature = "build_server"))]
  54 fn main() { panic!("You need to enable the `build_server` feature to use the built-in server"); }
  55
  56 #[cfg(any(feature = "build_server", all(feature = "tokio", feature = "validation")))]
  57 mod imp {
  58         use super::*;
  59
  60         use rr::Name;
  61         use query::*;
  62
  63         use std::net::SocketAddr;
  64
  65         use tokio::net::TcpListener;
  66         use tokio::io::{AsyncReadExt, AsyncWriteExt};
  67
  68         pub(super) async fn run_server(listener: TcpListener, resolver_sockaddr: SocketAddr) {
  69                 loop {
  70                         let (mut socket, _) = listener.accept().await.expect("Failed to accept new TCP connection");
  71                         tokio::spawn(async move {
  72                                 let mut response = ("400 Bad Request", "Bad Request");
  73                                 'ret_err: loop { // goto label
  74                                         let mut buf = [0; 4096];
  75                                         let mut buf_pos = 0;
  76                                         'read_req: loop {
  77                                                 if buf_pos == buf.len() { response.1 = "Request Too Large"; break 'ret_err; }
  78                                                 let read_res = { socket.read(&mut buf[buf_pos..]).await };
  79                                                 match read_res {
  80                                                         Ok(0) => return,
  81                                                         Ok(len) => {
  82                                                                 buf_pos += len;
  83                                                                 for window in buf[..buf_pos].windows(2) {
  84                                                                         if window == b"\r\n" { break 'read_req; }
  85                                                                 }
  86                                                         }
  87                                                         Err(e) if e.kind() == std::io::ErrorKind::WouldBlock => {},
  88                                                         Err(_) => return,
  89                                                 }
  90                                         }
  91                                         let request;
  92                                         if let Ok(s) = std::str::from_utf8(&buf[..buf_pos]) {
  93                                                 if let Some((r, _)) = s.split_once("\r\n") {
  94                                                         request = r;
  95                                                 } else {
  96                                                         debug_assert!(false);
  97                                                         break 'ret_err;
  98                                                 }
  99                                         } else {
 100                                                 break 'ret_err;
 101                                         }
 102
 103                                         let mut parts = request.split(" ");
 104                                         let (verb, path, http_vers);
 105                                         if let Some(v) = parts.next() { verb = v; } else { break 'ret_err; }
 106                                         if let Some(p) = parts.next() { path = p; } else { break 'ret_err; }
 107                                         if let Some(v) = parts.next() { http_vers = v; } else { break 'ret_err; }
 108                                         if parts.next().is_some() { break; }
 109                                         if verb != "GET" { break; }
 110                                         if http_vers != "HTTP/1.1" && http_vers != "HTTP/1.0" { break 'ret_err; }
 111
 112                                         const PATH_PFX: &'static str = "/dnssecproof?";
 113                                         if !path.starts_with(PATH_PFX) {
 114                                                 response = ("404 Not Found", "Not Found");
 115                                                 break 'ret_err;
 116                                         }
 117
 118                                         let (mut d, mut t) = ("", "");
 119                                         for arg in path[PATH_PFX.len()..].split("&") {
 120                                                 if let Some((k, v)) = arg.split_once("=") {
 121                                                         if k == "d" {
 122                                                                 d = v;
 123                                                         } else if k == "t" {
 124                                                                 t = v;
 125                                                         }
 126                                                 } else { break 'ret_err; }
 127                                         }
 128
 129                                         if d == "" || t == "" {
 130                                                 response.1 = "Missing d or t URI parameters";
 131                                                 break 'ret_err;
 132                                         }
 133                                         let query_name = if let Ok(domain) = Name::try_from(d) { domain } else {
 134                                                 response.1 = "Failed to parse domain, make sure it ends with .";
 135                                                 break 'ret_err;
 136                                         };
 137                                         let proof_res = match t.to_ascii_uppercase().as_str() {
 138                                                 "TXT" => build_txt_proof_async(resolver_sockaddr, &query_name).await,
 139                                                 "TLSA" => build_tlsa_proof_async(resolver_sockaddr, &query_name).await,
 140                                                 "A" => build_a_proof_async(resolver_sockaddr, &query_name).await,
 141                                                 "AAAA" => build_aaaa_proof_async(resolver_sockaddr, &query_name).await,
 142                                                 _ => break 'ret_err,
 143                                         };
 144                                         let (proof, cache_ttl) = if let Ok(proof) = proof_res { proof } else {
 145                                                 response = ("404 Not Found", "Failed to generate proof for given domain");
 146                                                 break 'ret_err;
 147                                         };
 148
 149                                         let _ = socket.write_all(
 150                                                 format!(
 151                                                         "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",
 152                                                         proof.len(), cache_ttl, cache_ttl
 153                                                 ).as_bytes()
 154                                         ).await;
 155                                         let _ = socket.write_all(&proof).await;
 156                                         return;
 157                                 }
 158                                 let _ = socket.write_all(format!(
 159                                         "HTTP/1.1 {}\r\nContent-Length: {}\r\nContent-Type: text/plain\r\nAccess-Control-Allow-Origin: *\r\n\r\n{}",
 160                                         response.0, response.1.len(), response.1,
 161                                 ).as_bytes()).await;
 162                         });
 163                 }
 164         }
 165 }
 166
 167 #[cfg(all(feature = "tokio", feature = "validation", test))]
 168 mod test {
 169         use super::*;
 170
 171         use crate::ser::parse_rr_stream;
 172         use crate::validation::verify_rr_stream;
 173
 174         use minreq;
 175
 176         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 177         async fn test_lookup() {
 178                 let ns = "8.8.8.8:53".parse().unwrap();
 179                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17492").await
 180                         .expect("Failed to bind to socket");
 181                 tokio::spawn(imp::run_server(listener, ns));
 182                 let resp = minreq::get(
 183                         "http://127.0.0.1:17492/dnssecproof?d=matt.user._bitcoin-payment.mattcorallo.com.&t=tXt"
 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_eq!(verified_rrs.verified_rrs.len(), 1);
 190         }
 191
 192         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 193         async fn test_lookup_a() {
 194                 let ns = "9.9.9.9:53".parse().unwrap();
 195                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17493").await
 196                         .expect("Failed to bind to socket");
 197                 tokio::spawn(imp::run_server(listener, ns));
 198                 let resp = minreq::get(
 199                         "http://127.0.0.1:17493/dnssecproof?d=cloudflare.com.&t=a"
 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!(verified_rrs.verified_rrs.len() >= 1);
 206         }
 207
 208         #[tokio::test(flavor = "multi_thread", worker_threads = 1)]
 209         async fn test_lookup_tlsa() {
 210                 let ns = "1.1.1.1:53".parse().unwrap();
 211                 let listener = tokio::net::TcpListener::bind("127.0.0.1:17494").await
 212                         .expect("Failed to bind to socket");
 213                 tokio::spawn(imp::run_server(listener, ns));
 214                 let resp = minreq::get(
 215                         "http://127.0.0.1:17494/dnssecproof?d=_25._tcp.mail.as397444.net.&t=TLSA"
 216                 ).send().unwrap();
 217
 218                 assert_eq!(resp.status_code, 200);
 219                 let rrs = parse_rr_stream(resp.as_bytes()).unwrap();
 220                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 221                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 222         }
 223 }