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It is safest +to attach them to the start of each source file to most effectively +state the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + 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, either version 3 of the License, or + (at your option) any later version. + + 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 . + +Also add information on how to contact you by electronic and paper mail. + + If your software can interact with users remotely through a computer +network, you should also make sure that it provides a way for users to +get its source. For example, if your program is a web application, its +interface could display a "Source" link that leads users to an archive +of the code. There are many ways you could offer source, and different +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 +. diff --git a/README.md b/README.md new file mode 100644 index 0000000..eec4982 --- /dev/null +++ b/README.md @@ -0,0 +1,29 @@ +# 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/. diff --git a/rustfmt.toml b/rustfmt.toml new file mode 100644 index 0000000..ade1f81 --- /dev/null +++ b/rustfmt.toml @@ -0,0 +1,8 @@ +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 diff --git a/src/client.rs b/src/client.rs new file mode 100644 index 0000000..f3bfc79 --- /dev/null +++ b/src/client.rs @@ -0,0 +1,149 @@ +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 + { + Ok(tokio_rustls::rustls::client::danger::ServerCertVerified::assertion()) + } + fn supported_verify_schemes(&self) -> Vec { + 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 { + 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); +} diff --git a/src/main.rs b/src/main.rs new file mode 100644 index 0000000..9ddb88c --- /dev/null +++ b/src/main.rs @@ -0,0 +1,122 @@ +#![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 = 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); + } + } +} diff --git a/src/record.rs b/src/record.rs new file mode 100644 index 0000000..7604e54 --- /dev/null +++ b/src/record.rs @@ -0,0 +1,228 @@ +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, Vec<(Direction, Vec)>)>; + +#[derive(Clone, Copy, Debug, Eq, Hash, PartialEq)] +pub enum Direction { + ClientToServer, + ServerToClient, +} + +pub struct Recorder { + file: std::fs::File, + receiver: Receiver<(u64, Option, Direction, Vec)>, +} + +impl Recorder { + #[allow(clippy::type_complexity)] + pub fn new(path: &str) -> (Self, Sender<(u64, Option, Direction, Vec)>) { + 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, Direction, Vec)>, + server_name: Option, +} + +impl sslrelay::HandlerCallbacks for Handler { + // DownStream non blocking callback + fn ds_nb_callback(&self, in_data: Vec, 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, _conn_id: u64) -> sslrelay::CallbackRet { + sslrelay::CallbackRet::Relay(in_data) + } + + // UpStream non blocking callback + fn us_nb_callback(&self, in_data: Vec, 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, _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::, Vec<(Direction, Vec)>)>::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:?}") + } + } + } + } +} diff --git a/src/server.rs b/src/server.rs new file mode 100644 index 0000000..073f855 --- /dev/null +++ b/src/server.rs @@ -0,0 +1,220 @@ +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) 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 + } +} diff --git a/src/util.rs b/src/util.rs new file mode 100644 index 0000000..e69de29