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[package]
name = "netreplay"
version = "0.1.0"
edition = "2024"
[dependencies]
argp = "0.4.0"
aws-lc-rs = "1.14.1"
tlsh = { package = "fast-tlsh", version = "0.1.10", features = ["easy-functions"] }
sslrelay = { path = "../sslrelay-lib" }
static_cell = "2.1.1"
tokio = { version = "1.48.0", features = ["io-util", "macros", "net", "rt", "rt-multi-thread", "sync"]}
tokio-rustls = "0.26.4"
x509-parser = "0.18.0"

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solutions will be better for different programs; see section 13 for the
specific requirements.
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU AGPL, see
<https://www.gnu.org/licenses/>.

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# netreplay
This program has two modes:
* recording proxy: relays trafic with or without TLS and record requests and responses in clear. It is a TLS termination thus a certificate is needed.
* trafic replay: run a client that sends the recorded requests, and a server that responds with the corresponding recorded responses. A proxy can be placed in between. The proxy can even alter the plain data, because the server uses hash distance to identify the requests.
It has been tested with HTTP trafic only. Other protocols which are not request/response (or even websocket) may not be recorded properly.
It relies on the server name extension in TLS (SNI). Requests without server name may not be recorded.
For experimental purpose. Do not use on an open network where security matters.
## Record file format
The record file is a list of records. Each record follows this format:
* [1 byte] direction: ASCII 'C' for client-to-server, 'S' for server-to-client
* [8 bytes] connection id, big endian
* [1 byte] server name length
* server name (TLS's SNI or HTTP's Host)
* [8 bytes] data length, big endian
* data
## License
GNU AGPL v3, CopyLeft 2025 Pascal Engélibert [(why copyleft?)](https://txmn.tk/blog/why-copyleft/)
This program is free software: you can redistribute it and/or modify it under the terms of the GNU Affero General Public License as published by the Free Software Foundation, version 3 of the License.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License along with this program. If not, see https://www.gnu.org/licenses/.

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hard_tabs = true
newline_style = "unix"
unstable_features = true
format_code_in_doc_comments = true
format_macro_bodies = true
format_macro_matchers = true
format_strings = true

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use crate::{
TlsMode,
record::{Direction, Records},
};
use std::{net::ToSocketAddrs, sync::Arc};
use tokio::{
io::{AsyncReadExt, AsyncWriteExt},
net::TcpStream,
sync::oneshot,
};
use tokio_rustls::{
TlsConnector,
rustls::{
SignatureScheme,
client::danger::{HandshakeSignatureValid, ServerCertVerifier},
pki_types::ServerName,
},
};
#[derive(Debug)]
struct DummyCertVerifier;
impl ServerCertVerifier for DummyCertVerifier {
fn verify_server_cert(
&self,
_end_entity: &tokio_rustls::rustls::pki_types::CertificateDer<'_>,
_intermediates: &[tokio_rustls::rustls::pki_types::CertificateDer<'_>],
_server_name: &tokio_rustls::rustls::pki_types::ServerName<'_>,
_ocsp_response: &[u8],
_now: tokio_rustls::rustls::pki_types::UnixTime,
) -> Result<tokio_rustls::rustls::client::danger::ServerCertVerified, tokio_rustls::rustls::Error>
{
Ok(tokio_rustls::rustls::client::danger::ServerCertVerified::assertion())
}
fn supported_verify_schemes(&self) -> Vec<tokio_rustls::rustls::SignatureScheme> {
vec![
SignatureScheme::RSA_PKCS1_SHA1,
SignatureScheme::ECDSA_SHA1_Legacy,
SignatureScheme::RSA_PKCS1_SHA256,
SignatureScheme::ECDSA_NISTP256_SHA256,
SignatureScheme::RSA_PKCS1_SHA384,
SignatureScheme::ECDSA_NISTP384_SHA384,
SignatureScheme::RSA_PKCS1_SHA512,
SignatureScheme::ECDSA_NISTP521_SHA512,
SignatureScheme::RSA_PSS_SHA256,
SignatureScheme::RSA_PSS_SHA384,
SignatureScheme::RSA_PSS_SHA512,
SignatureScheme::ED25519,
SignatureScheme::ED448,
SignatureScheme::ML_DSA_44,
SignatureScheme::ML_DSA_65,
SignatureScheme::ML_DSA_87,
]
}
fn verify_tls12_signature(
&self,
_message: &[u8],
_cert: &tokio_rustls::rustls::pki_types::CertificateDer<'_>,
_dss: &tokio_rustls::rustls::DigitallySignedStruct,
) -> Result<
tokio_rustls::rustls::client::danger::HandshakeSignatureValid,
tokio_rustls::rustls::Error,
> {
Ok(HandshakeSignatureValid::assertion())
}
fn verify_tls13_signature(
&self,
_message: &[u8],
_cert: &tokio_rustls::rustls::pki_types::CertificateDer<'_>,
_dss: &tokio_rustls::rustls::DigitallySignedStruct,
) -> Result<HandshakeSignatureValid, tokio_rustls::rustls::Error> {
Ok(HandshakeSignatureValid::assertion())
}
}
pub async fn play(
records: &'static Records,
tls_mode: TlsMode,
connect_to: (String, u16),
sync_receiver: oneshot::Receiver<()>,
repeat: u32,
) {
sync_receiver.await.unwrap();
let mut handles = Vec::new();
let connect_to = connect_to.to_socket_addrs().unwrap().next().unwrap();
match tls_mode {
TlsMode::Both | TlsMode::Client => {
let config = Arc::new(
tokio_rustls::rustls::ClientConfig::builder()
.dangerous()
.with_custom_certificate_verifier(Arc::new(DummyCertVerifier))
.with_no_client_auth(),
);
for (_id, (server_name, records)) in records.iter() {
let connector = TlsConnector::from(config.clone());
handles.push(tokio::spawn(async move {
let server_name =
ServerName::try_from(String::from_utf8(server_name.clone()).unwrap())
.unwrap();
for _i in 0..repeat {
let stream = TcpStream::connect(connect_to).await.unwrap();
let mut stream = connector
.connect(server_name.clone(), stream)
.await
.unwrap();
for (direction, data) in records {
match direction {
Direction::ClientToServer => {
stream.write_all(data).await.unwrap();
}
Direction::ServerToClient => {
let mut buf = Vec::new();
stream.read_buf(&mut buf).await.ok();
}
}
}
stream.shutdown().await.unwrap();
}
}));
}
}
TlsMode::None | TlsMode::Server => {
for (_id, (_server_name, records)) in records.iter() {
handles.push(tokio::spawn(async move {
for _i in 0..repeat {
let mut stream = TcpStream::connect(connect_to).await.unwrap();
for (direction, data) in records {
match direction {
Direction::ClientToServer => {
stream.write_all(data).await.unwrap();
}
Direction::ServerToClient => {
let mut buf = Vec::new();
stream.read_buf(&mut buf).await.ok();
}
}
}
stream.shutdown().await.unwrap();
}
}));
}
}
}
for handle in handles {
handle.await.unwrap();
}
//std::process::exit(0);
}

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#![feature(let_chains)]
mod client;
mod record;
mod server;
use record::Records;
use argp::FromArgs;
use static_cell::StaticCell;
use tokio::sync::oneshot;
/// Play recorded requests and responses
#[derive(FromArgs)]
struct Opt {
/// Path to record file
#[argp(positional)]
record_file: String,
#[argp(subcommand)]
subcommand: Subcommand,
}
#[derive(FromArgs)]
#[argp(subcommand)]
enum Subcommand {
/// Replay from records
Play(OptPlay),
/// Print records
Print(OptPrint),
/// Record traffic
Record(OptRecord),
}
/// Replay from records
#[derive(FromArgs)]
#[argp(subcommand, name = "play")]
struct OptPlay {
/// Connect to address
#[argp(positional)]
forward_addr: String,
/// Connect to port
#[argp(positional)]
forward_port: u16,
/// Listen to port
#[argp(positional)]
listen_port: u16,
/// Path to PEM certificates and keys
#[argp(positional)]
certs: String,
/// Where to use TLS
#[argp(positional)]
tls: String,
/// Repeat N times
#[argp(option, short = 'r', default = "1")]
repeat: u32,
}
/// Print records
#[derive(FromArgs)]
#[argp(subcommand, name = "print")]
struct OptPrint {
/// Print packets
#[argp(switch, short = 'p')]
packets: bool,
}
/// Record traffic
#[derive(FromArgs)]
#[argp(subcommand, name = "record")]
struct OptRecord {}
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
enum TlsMode {
None,
Client,
Server,
Both,
}
static RECORDS: StaticCell<Records> = StaticCell::new();
#[tokio::main]
async fn main() {
let opt: Opt = argp::parse_args_or_exit(argp::DEFAULT);
match opt.subcommand {
Subcommand::Play(subopt) => {
let tls_mode = match subopt.tls.as_str() {
"none" => TlsMode::None,
"client" => TlsMode::Client,
"server" => TlsMode::Server,
"both" => TlsMode::Both,
_ => panic!("TLS mode must be one of none,client,server,both."),
};
let records = RECORDS.init(record::read_record_file(&opt.record_file));
let (sync_sender, sync_receiver) = oneshot::channel();
let client = tokio::spawn(client::play(
records,
tls_mode,
(subopt.forward_addr, subopt.forward_port),
sync_receiver,
subopt.repeat,
));
server::play(
records,
tls_mode,
&subopt.certs,
("0.0.0.0", subopt.listen_port),
sync_sender,
)
.await;
client.await.unwrap();
}
Subcommand::Print(subopt) => {
let records = record::read_record_file(&opt.record_file);
record::print_records(&records, subopt.packets);
}
Subcommand::Record(_subopt) => {
record::make_record(&opt.record_file);
}
}
}

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use std::{
collections::{BTreeMap, btree_map},
io::{Read, Write},
sync::mpsc::{Receiver, Sender, channel},
};
const CLIENT_TO_SERVER: u8 = b'C';
const SERVER_TO_CLIENT: u8 = b'S';
pub type Records = BTreeMap<u64, (Vec<u8>, Vec<(Direction, Vec<u8>)>)>;
#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)]
pub enum Direction {
ClientToServer,
ServerToClient,
}
pub struct Recorder {
file: std::fs::File,
receiver: Receiver<(u64, Option<String>, Direction, Vec<u8>)>,
}
impl Recorder {
#[allow(clippy::type_complexity)]
pub fn new(path: &str) -> (Self, Sender<(u64, Option<String>, Direction, Vec<u8>)>) {
let (sender, receiver) = channel();
(
Self {
file: std::fs::OpenOptions::new()
.create(true)
.write(true)
.truncate(true)
.open(path)
.unwrap(),
receiver,
},
sender,
)
}
pub fn run(&mut self) {
while let Ok((conn_id, server_name, direction, data)) = self.receiver.recv() {
let Some(server_name) = server_name else {
continue;
};
let server_name = server_name.as_bytes();
self.file
.write_all(&[match direction {
Direction::ClientToServer => CLIENT_TO_SERVER,
Direction::ServerToClient => SERVER_TO_CLIENT,
}])
.unwrap();
self.file.write_all(&conn_id.to_be_bytes()).unwrap();
self.file.write_all(&[server_name.len() as u8]).unwrap();
self.file.write_all(server_name).unwrap();
self.file
.write_all(&(data.len() as u64).to_be_bytes())
.unwrap();
self.file.write_all(&data).unwrap();
self.file.flush().unwrap();
}
}
}
#[derive(Clone)]
struct Handler {
sender: Sender<(u64, Option<String>, Direction, Vec<u8>)>,
server_name: Option<String>,
}
impl sslrelay::HandlerCallbacks for Handler {
// DownStream non blocking callback
fn ds_nb_callback(&self, in_data: Vec<u8>, conn_id: u64) {
self.sender
.send((
conn_id,
self.server_name.clone(),
Direction::ClientToServer,
in_data,
))
.unwrap();
}
// DownStream blocking callback
fn ds_b_callback(&mut self, in_data: Vec<u8>, _conn_id: u64) -> sslrelay::CallbackRet {
sslrelay::CallbackRet::Relay(in_data)
}
// UpStream non blocking callback
fn us_nb_callback(&self, in_data: Vec<u8>, conn_id: u64) {
self.sender
.send((
conn_id,
self.server_name.clone(),
Direction::ServerToClient,
in_data,
))
.unwrap();
}
// UpStream blocking callback
fn us_b_callback(&mut self, in_data: Vec<u8>, _conn_id: u64) -> sslrelay::CallbackRet {
sslrelay::CallbackRet::Relay(in_data)
}
fn set_server_name(&mut self, server_name: Option<&str>) {
self.server_name = server_name.map(str::to_string);
}
}
pub fn make_record(path: &str) {
let (mut recorder, sender) = Recorder::new(path);
let mut relay = sslrelay::SSLRelay::new(
Handler {
sender,
server_name: None,
},
sslrelay::RelayConfig {
downstream_data_type: sslrelay::TCPDataType::TLS,
upstream_data_type: sslrelay::TCPDataType::TLS,
bind_host: "127.0.0.1".to_string(),
bind_port: "443".to_string(),
remote_host: |server_name| {
server_name
.map(str::to_string)
.unwrap_or_else(|| String::from("www.apple.com"))
},
remote_port: "443".to_string(),
tls_config: sslrelay::TLSConfig::FILE {
certificate_path: "/dev/shm/exp/certs/prime256v1/all.crt".to_string(),
private_key_path: "/dev/shm/exp/certs/prime256v1/all.key".to_string(),
},
},
);
std::thread::spawn(move || recorder.run());
relay.start();
}
pub fn read_record_file(path: &str) -> Records {
let mut file = std::fs::OpenOptions::new().read(true).open(path).unwrap();
let mut records = BTreeMap::<u64, (Vec<u8>, Vec<(Direction, Vec<u8>)>)>::new();
loop {
let mut direction = [0; 1];
if file.read(&mut direction).unwrap() != 1 {
break;
}
let direction = match direction[0] {
CLIENT_TO_SERVER => Direction::ClientToServer,
SERVER_TO_CLIENT => Direction::ServerToClient,
_ => {
println!("Error: invalid direction. stop.");
break;
}
};
let mut conn_id = [0; 8];
if file.read(&mut conn_id).unwrap() != 8 {
println!("Error: incomplete conn id. stop.");
break;
}
let conn_id = u64::from_be_bytes(conn_id);
let mut server_name_len = [0];
if file.read(&mut server_name_len).unwrap() != 1 {
println!("Error: incomplete server name len. stop.");
break;
}
let server_name_len = server_name_len[0] as usize;
let mut server_name = vec![0; server_name_len];
if file.read(&mut server_name).unwrap() != server_name_len {
println!("Error: incomplete data. stop.");
break;
}
let mut len = [0; 8];
if file.read(&mut len).unwrap() != 8 {
println!("Error: incomplete len. stop.");
break;
}
let len = u64::from_be_bytes(len);
if len > 0xfff_ffff {
println!("Error: len too large {len}. stop.");
break;
}
let mut buf = vec![0; len as usize];
if file.read(&mut buf).unwrap() != len as usize {
println!("Error: incomplete data. stop.");
break;
}
match records.entry(conn_id) {
btree_map::Entry::Occupied(mut entry) => {
entry.get_mut().1.push((direction, buf));
}
btree_map::Entry::Vacant(entry) => {
entry.insert((server_name, vec![(direction, buf)]));
}
}
}
records
}
pub fn print_records(records: &Records, print_packets: bool) {
for (id, (server_name, records)) in records {
let server_name = str::from_utf8(server_name.as_slice()).unwrap();
println!("{id} {server_name}");
for (direction, data) in records {
match direction {
Direction::ClientToServer => {
println!(" >> {}", data.len());
}
Direction::ServerToClient => {
println!(" << {}", data.len());
}
}
if print_packets {
let data = if data.len() >= 256 {
&data[0..256]
} else {
data.as_slice()
};
if let Ok(data) = str::from_utf8(data) {
println!(" {data:?}")
} else {
println!(" {data:?}")
}
}
}
}
}

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use crate::{
TlsMode,
record::{Direction, Records},
};
use std::{collections::HashMap, sync::Arc};
use tokio::{
io::{AsyncReadExt, AsyncWriteExt},
net::TcpListener,
sync::oneshot,
};
use tokio_rustls::rustls::{
pki_types::{
CertificateDer, PrivateKeyDer,
pem::{self, PemObject, SectionKind},
},
server::ResolvesServerCertUsingSni,
sign::CertifiedKey,
};
use x509_parser::prelude::GeneralName;
pub async fn play(
records: &'static Records,
tls_mode: TlsMode,
cert_path: &str,
listen_addr: (&str, u16),
sync_sender: oneshot::Sender<()>,
) {
let mut response_map = HashMap::new();
for (_id, (server_name, records)) in records.iter() {
let mut hash = None;
let mut responses = Vec::new();
for (direction, data) in records {
match direction {
Direction::ClientToServer => {
if let Some(hash) = hash
&& !responses.is_empty()
{
response_map.insert((server_name.to_vec(), hash), responses);
responses = Vec::new();
}
hash = Some(
tlsh::hash_buf(data)
.map_or_else(|_| data.clone(), |h| h.to_string().into_bytes()),
);
}
Direction::ServerToClient => {
responses.push(data);
}
}
}
if let Some(hash) = hash
&& !responses.is_empty()
{
response_map.insert((server_name.to_vec(), hash), responses);
}
}
match tls_mode {
TlsMode::Both | TlsMode::Server => {
let mut resolver = ResolvesServerCertUsingSni::new();
let config = tokio_rustls::rustls::ServerConfig::builder()
.with_no_client_auth()
.with_cert_resolver(Arc::new(ResolvesServerCertUsingSni::new()));
for file in std::fs::read_dir(cert_path).unwrap() {
match file {
Ok(file) => {
if file.file_name().as_encoded_bytes().ends_with(b".crt") {
for section in
<(pem::SectionKind, Vec<u8>) as PemObject>::pem_file_iter(
file.path(),
)
.unwrap()
{
let (kind, data) = section.unwrap();
if kind == SectionKind::Certificate {
let (_rem, cert) =
x509_parser::parse_x509_certificate(&data).unwrap();
if !cert.is_ca() {
println!("File: {:?}", file.file_name());
let mut key_path = file.path().to_path_buf();
key_path.pop();
let file_name =
file.file_name().to_str().unwrap().to_string();
let mut key_file_name =
file_name[0..file_name.len() - 4].to_string();
key_file_name.push_str(".key");
let key = PrivateKeyDer::from_pem_file(
key_path.join(key_file_name),
)
.unwrap();
let key = config
.crypto_provider()
.key_provider
.load_private_key(key)
.unwrap();
// This wants static lifetime...
let cert_key = CertifiedKey::new(
vec![CertificateDer::from_slice(Box::leak(
data.to_vec().into_boxed_slice(),
))],
key,
);
for name in cert
.subject_alternative_name()
.unwrap()
.unwrap()
.value
.general_names
.iter()
{
if let GeneralName::DNSName(name) = name {
resolver.add(dbg!(name), cert_key.clone()).unwrap();
}
}
}
}
}
}
}
Err(e) => eprintln!("Error listing cert directory: {e:?}"),
}
}
// Config requires resolver, keys can be added to resolver, creating a key requires config. WTF!?
// So we have to re-create config.
let config = Arc::new(
tokio_rustls::rustls::ServerConfig::builder()
.with_no_client_auth()
.with_cert_resolver(Arc::new(resolver)),
);
//let acceptor = tokio_rustls::TlsAcceptor::from(Arc::new(config));
let listener = TcpListener::bind(listen_addr).await.unwrap();
let response_map = Arc::new(response_map);
sync_sender.send(()).unwrap();
loop {
let config = config.clone();
let (stream, _peer_addr) = listener.accept().await.unwrap();
let acceptor = tokio_rustls::LazyConfigAcceptor::new(
tokio_rustls::rustls::server::Acceptor::default(),
stream,
);
//let acceptor = acceptor.clone();
let response_map = response_map.clone();
let fut = async move {
/*let mut server_name = None;
let mut stream = acceptor
.accept_with(stream, |conn| {
server_name = conn.server_name().map(String::from)
})
.await
.unwrap();
let server_name = server_name.unwrap();*/
let accepted = acceptor.await.unwrap();
let server_name = accepted.client_hello().server_name().unwrap().to_string();
let mut stream = accepted.into_stream(config).await.unwrap();
let mut req = Vec::new();
// TODO if there is a body
while !req.ends_with(b"\r\n\r\n") {
if stream.read_buf(&mut req).await.unwrap() == 0 {
break;
}
}
if let Ok(req) = str::from_utf8(&req) {
println!("{req}");
}
let req_hash = tlsh::hash_buf(&req)
.map_or_else(|_| req.clone(), |h| h.to_string().into_bytes());
let mut best = None;
for (i_server_name, hash) in response_map.keys() {
if i_server_name != server_name.as_bytes() {
continue;
}
let diff = compare(&req_hash, hash);
if let Some((best_hash, best_diff)) = &mut best {
if diff < *best_diff {
*best_hash = hash;
*best_diff = diff;
}
} else {
best = Some((hash, diff));
}
}
if let Some((hash, _diff)) = best {
let responses = response_map
.get(&(server_name.as_bytes().to_vec(), hash.clone()))
.unwrap();
for &res in responses {
stream.write_all(res).await.unwrap();
stream.flush().await.unwrap();
}
} else {
eprintln!("No response found for SNI=`{server_name}`");
}
stream.shutdown().await.unwrap();
};
tokio::spawn(async move {
fut.await;
});
}
}
TlsMode::None | TlsMode::Client => {
// TODO
}
}
}
fn compare(a: &[u8], b: &[u8]) -> u32 {
if let (Ok(a), Ok(b)) = (str::from_utf8(a), str::from_utf8(b)) {
if let Ok(diff) = tlsh::compare(a, b) {
return diff;
}
}
if a == b {
0
} else {
a.len().max(b.len()) as u32
}
}

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