diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/main.rs | 76 | ||||
| -rw-r--r-- | src/pkt.rs | 138 | ||||
| -rw-r--r-- | src/platform/linux.rs | 43 | ||||
| -rw-r--r-- | src/platform/windows.rs | 4 |
4 files changed, 214 insertions, 47 deletions
diff --git a/src/main.rs b/src/main.rs index e8d2f78..319866f 100644 --- a/src/main.rs +++ b/src/main.rs @@ -38,54 +38,38 @@ Press Ctrl+C or close this window to stop. static RUNNING: AtomicBool = AtomicBool::new(true); static DELAY_MS: OnceLock<u64> = OnceLock::new(); +static OPT_FAKE: OnceLock<bool> = OnceLock::new(); + fn delay_ms() -> u64 { *DELAY_MS.get().expect("DELAY_MS not initialized") } -fn split_packet(pkt: &pkt::PktView, start: u32, end: Option<u32>, - out_buf: &mut Vec<u8>) -> Result<()> { - use etherparse::*; - - let ip = &pkt.ip; - let tcp = &pkt.tcp; - let payload = tcp.payload(); - - let end = end.unwrap_or(payload.len().try_into()?); - - if start > end || payload.len() < end as usize { - return Err(anyhow!("invalid index")); - } - - let opts = tcp.options(); - let mut tcp_hdr = tcp.to_header(); - tcp_hdr.sequence_number += start; - - // TODO: refactor this to reuse IP header with no copy - let builder = match ip { - IpSlice::Ipv4(hdr) => - PacketBuilder::ip(IpHeaders::Ipv4( - hdr.header().to_header(), - hdr.extensions().to_header() - )), - - IpSlice::Ipv6(hdr) => - PacketBuilder::ip(IpHeaders::Ipv6( - hdr.header().to_header(), - Default::default() - )) - }.tcp_header(tcp_hdr).options_raw(opts)?; +fn split_packet( + view: &pkt::PktView, + start: u32, + end: Option<u32>, + out_buf: &mut Vec<u8> +) -> Result<()> { + pkt::split_packet_0(view, start, end, out_buf, None, None) +} - let payload = &payload[start as usize..end as usize]; +fn send_segment( + view: &pkt::PktView, + start: u32, + end: Option<u32>, + buf: &mut Vec<u8> +) -> Result<()> { + use platform::send_to_raw; - out_buf.clear(); - builder.write(out_buf, payload)?; + pkt::fake_clienthello(view, start, end, buf)?; + send_to_raw(buf)?; + split_packet(view, start, end, buf)?; + send_to_raw(buf)?; Ok(()) } fn split_packet_1(view: &pkt::PktView, order: &[u32], buf: &mut Vec<u8>) -> Result<()> { - use platform::send_to_raw; - let mut it = order.iter().copied(); let Some(mut first) = it.next() else { @@ -93,19 +77,16 @@ fn split_packet_1(view: &pkt::PktView, order: &[u32], buf: &mut Vec<u8>) -> Resu }; for next in it { - split_packet(view, first, Some(next), buf)?; - send_to_raw(buf)?; + send_segment(view, first, Some(next), buf)?; std::thread::sleep(std::time::Duration::from_millis(delay_ms())); first = next; } - split_packet(view, first, None, buf)?; - send_to_raw(buf)?; + send_segment(view, first, None, buf)?; Ok(()) } - /// Return Ok(true) if packet is handled fn handle_packet(pkt: &[u8], buf: &mut Vec::<u8>) -> Result<bool> { #[cfg(target_os = "linux")] @@ -168,6 +149,10 @@ Options: --nft-command <string> (linux only, default: nft) --loglevel <debug|info|warning|error> (default: warning) --no-splash Do not print splash messages + + --fake Enable fake clienthello injection + --fake-ttl <u8> Override ttl of fake clienthello (default: 8) + -h, --help Show this help"# ); } @@ -175,6 +160,8 @@ Options: fn parse_args_1() -> Result<()> { let mut delay_ms: u64 = 0; let mut no_splash: bool = false; + let mut fake: bool = false; + let mut fake_ttl: u8 = 8; #[cfg(debug_assertions)] let mut log_level: log::LogLevel = LogLevel::Debug; @@ -196,6 +183,9 @@ fn parse_args_1() -> Result<()> { "--loglevel" => { log_level = take_value(&mut args, argv)?; } "--no-splash" => { no_splash = true; } + "--fake" => { fake = true; } + "--fake-ttl" => { fake_ttl = take_value(&mut args, argv)?; } + #[cfg(target_os = "linux")] "--queue-num" => { queue_num = take_value(&mut args, argv)?; } @@ -209,6 +199,8 @@ fn parse_args_1() -> Result<()> { DELAY_MS.set(delay_ms).map_err(|_| anyhow!("DELAY_MS already initialized"))?; log::set_no_splash(no_splash).map_err(|e| anyhow!("{e}"))?; log::set_log_level(log_level).map_err(|e| anyhow!("{e}"))?; + OPT_FAKE.set(fake).map_err(|_| anyhow!("OPT_FAKE already initialized"))?; + pkt::OPT_FAKE_TTL.set(fake_ttl).map_err(|_| anyhow!("OPT_FAKE_TTL already initialized"))?; #[cfg(target_os = "linux")] platform::QUEUE_NUM.set(queue_num).map_err(|_| anyhow!("QUEUE_NUM already initialized"))?; @@ -17,6 +17,76 @@ use anyhow::Result; use etherparse::{IpSlice, TcpSlice}; +use anyhow::anyhow; +use std::sync::OnceLock; + +/// www.microsoft.com +/// Stolen from github.com/bol-van/zapret/blob/master/nfq/desync.c +const DEFAULT_FAKE_TLS_CLIENTHELLO: &'static [u8] = &[ + 0x16, 0x03, 0x01, 0x02, 0xa3, 0x01, 0x00, 0x02, 0x9f, 0x03, 0x03, 0x41, + 0x88, 0x82, 0x2d, 0x4f, 0xfd, 0x81, 0x48, 0x9e, 0xe7, 0x90, 0x65, 0x1f, + 0xba, 0x05, 0x7b, 0xff, 0xa7, 0x5a, 0xf9, 0x5b, 0x8a, 0x8f, 0x45, 0x8b, + 0x41, 0xf0, 0x3d, 0x1b, 0xdd, 0xe3, 0xf8, 0x20, 0x9b, 0x23, 0xa5, 0xd2, + 0x21, 0x1e, 0x9f, 0xe7, 0x85, 0x6c, 0xfc, 0x61, 0x80, 0x3a, 0x3f, 0xba, + 0xb9, 0x60, 0xba, 0xb3, 0x0e, 0x98, 0x27, 0x6c, 0xf7, 0x38, 0x28, 0x65, + 0x80, 0x5d, 0x40, 0x38, 0x00, 0x22, 0x13, 0x01, 0x13, 0x03, 0x13, 0x02, + 0xc0, 0x2b, 0xc0, 0x2f, 0xcc, 0xa9, 0xcc, 0xa8, 0xc0, 0x2c, 0xc0, 0x30, + 0xc0, 0x0a, 0xc0, 0x09, 0xc0, 0x13, 0xc0, 0x14, 0x00, 0x9c, 0x00, 0x9d, + 0x00, 0x2f, 0x00, 0x35, 0x01, 0x00, 0x02, 0x34, 0x00, 0x00, 0x00, 0x16, + 0x00, 0x14, 0x00, 0x00, 0x11, 0x77, 0x77, 0x77, 0x2e, 0x6d, 0x69, 0x63, + 0x72, 0x6f, 0x73, 0x6f, 0x66, 0x74, 0x2e, 0x63, 0x6f, 0x6d, 0x00, 0x17, + 0x00, 0x00, 0xff, 0x01, 0x00, 0x01, 0x00, 0x00, 0x0a, 0x00, 0x0e, 0x00, + 0x0c, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x18, 0x00, 0x19, 0x01, 0x00, 0x01, + 0x01, 0x00, 0x0b, 0x00, 0x02, 0x01, 0x00, 0x00, 0x23, 0x00, 0x00, 0x00, + 0x10, 0x00, 0x0e, 0x00, 0x0c, 0x02, 0x68, 0x32, 0x08, 0x68, 0x74, 0x74, + 0x70, 0x2f, 0x31, 0x2e, 0x31, 0x00, 0x05, 0x00, 0x05, 0x01, 0x00, 0x00, + 0x00, 0x00, 0x00, 0x22, 0x00, 0x0a, 0x00, 0x08, 0x04, 0x03, 0x05, 0x03, + 0x06, 0x03, 0x02, 0x03, 0x00, 0x12, 0x00, 0x00, 0x00, 0x33, 0x00, 0x6b, + 0x00, 0x69, 0x00, 0x1d, 0x00, 0x20, 0x69, 0x15, 0x16, 0x29, 0x6d, 0xad, + 0xd5, 0x68, 0x88, 0x27, 0x2f, 0xde, 0xaf, 0xac, 0x3c, 0x4c, 0xa4, 0xe4, + 0xd8, 0xc8, 0xfb, 0x41, 0x87, 0xf4, 0x76, 0x4e, 0x0e, 0xfa, 0x64, 0xc4, + 0xe9, 0x29, 0x00, 0x17, 0x00, 0x41, 0x04, 0xfe, 0x62, 0xb9, 0x08, 0xc8, + 0xc3, 0x2a, 0xb9, 0x87, 0x37, 0x84, 0x42, 0x6b, 0x5c, 0xcd, 0xc9, 0xca, + 0x62, 0x38, 0xd3, 0xd9, 0x99, 0x8a, 0xc4, 0x2d, 0xc6, 0xd0, 0xa3, 0x60, + 0xb2, 0x12, 0x54, 0x41, 0x8e, 0x52, 0x5e, 0xe3, 0xab, 0xf9, 0xc2, 0x07, + 0x81, 0xdc, 0xf8, 0xf2, 0x6a, 0x91, 0x40, 0x2f, 0xcb, 0xa4, 0xff, 0x6f, + 0x24, 0xc7, 0x4d, 0x77, 0x77, 0x2d, 0x6f, 0xe0, 0x77, 0xaa, 0x92, 0x00, + 0x2b, 0x00, 0x05, 0x04, 0x03, 0x04, 0x03, 0x03, 0x00, 0x0d, 0x00, 0x18, + 0x00, 0x16, 0x04, 0x03, 0x05, 0x03, 0x06, 0x03, 0x08, 0x04, 0x08, 0x05, + 0x08, 0x06, 0x04, 0x01, 0x05, 0x01, 0x06, 0x01, 0x02, 0x03, 0x02, 0x01, + 0x00, 0x2d, 0x00, 0x02, 0x01, 0x01, 0x00, 0x1c, 0x00, 0x02, 0x40, 0x01, + 0x00, 0x1b, 0x00, 0x07, 0x06, 0x00, 0x01, 0x00, 0x02, 0x00, 0x03, 0xfe, + 0x0d, 0x01, 0x19, 0x00, 0x00, 0x01, 0x00, 0x03, 0x21, 0x00, 0x20, 0x62, + 0xe8, 0x83, 0xd8, 0x97, 0x05, 0x8a, 0xbe, 0xa1, 0xf2, 0x63, 0x4e, 0xce, + 0x93, 0x84, 0x8e, 0xcf, 0xe7, 0xdd, 0xb2, 0xe4, 0x87, 0x06, 0xac, 0x11, + 0x19, 0xbe, 0x0e, 0x71, 0x87, 0xf1, 0xa6, 0x00, 0xef, 0xd8, 0x6b, 0x27, + 0x5e, 0xc0, 0xa7, 0x5d, 0x42, 0x4e, 0x8c, 0xdc, 0xf3, 0x9f, 0x1c, 0x51, + 0x62, 0xef, 0xff, 0x5b, 0xed, 0xc8, 0xfd, 0xee, 0x6f, 0xbb, 0x88, 0x9b, + 0xb1, 0x30, 0x9c, 0x66, 0x42, 0xab, 0x0f, 0x66, 0x89, 0x18, 0x8b, 0x11, + 0xc1, 0x6d, 0xe7, 0x2a, 0xeb, 0x96, 0x3b, 0x7f, 0x52, 0x78, 0xdb, 0xf8, + 0x6d, 0x04, 0xf7, 0x95, 0x1a, 0xa8, 0xf0, 0x64, 0x52, 0x07, 0x39, 0xf0, + 0xa8, 0x1d, 0x0d, 0x16, 0x36, 0xb7, 0x18, 0x0e, 0xc8, 0x44, 0x27, 0xfe, + 0xf3, 0x31, 0xf0, 0xde, 0x8c, 0x74, 0xf5, 0xa1, 0xd8, 0x8f, 0x6f, 0x45, + 0x97, 0x69, 0x79, 0x5e, 0x2e, 0xd4, 0xb0, 0x2c, 0x0c, 0x1a, 0x6f, 0xcc, + 0xce, 0x90, 0xc7, 0xdd, 0xc6, 0x60, 0x95, 0xf3, 0xc2, 0x19, 0xde, 0x50, + 0x80, 0xbf, 0xde, 0xf2, 0x25, 0x63, 0x15, 0x26, 0x63, 0x09, 0x1f, 0xc5, + 0xdf, 0x32, 0xf5, 0xea, 0x9c, 0xd2, 0xff, 0x99, 0x4e, 0x67, 0xa2, 0xe5, + 0x1a, 0x94, 0x85, 0xe3, 0xdf, 0x36, 0xa5, 0x83, 0x4b, 0x0a, 0x1c, 0xaf, + 0xd7, 0x48, 0xc9, 0x4b, 0x8a, 0x27, 0xdd, 0x58, 0x7f, 0x95, 0xf2, 0x6b, + 0xde, 0x2b, 0x12, 0xd3, 0xec, 0x4d, 0x69, 0x37, 0x9c, 0x13, 0x9b, 0x16, + 0xb0, 0x45, 0x52, 0x38, 0x77, 0x69, 0xef, 0xaa, 0x65, 0x19, 0xbc, 0xc2, + 0x93, 0x4d, 0xb0, 0x1b, 0x7f, 0x5b, 0x41, 0xff, 0xaf, 0xba, 0x50, 0x51, + 0xc3, 0xf1, 0x27, 0x09, 0x25, 0xf5, 0x60, 0x90, 0x09, 0xb1, 0xe5, 0xc0, + 0xc7, 0x42, 0x78, 0x54, 0x3b, 0x23, 0x19, 0x7d, 0x8e, 0x72, 0x13, 0xb4, + 0xd3, 0xcd, 0x63, 0xb6, 0xc4, 0x4a, 0x28, 0x3d, 0x45, 0x3e, 0x8b, 0xdb, + 0x84, 0x4f, 0x78, 0x64, 0x30, 0x69, 0xe2, 0x1b +]; + +pub static OPT_FAKE_TTL: OnceLock<u8> = OnceLock::new(); + +fn fake_ttl() -> u8 { + *OPT_FAKE_TTL.get().expect("OPT_FAKE_TTL not initialized") +} pub struct PktView<'a> { pub ip: IpSlice<'a>, @@ -32,3 +102,71 @@ impl<'a> PktView<'a> { Ok(Self { ip, tcp }) } } + +/// Write TCP/IP packet (payload = view.tcp.payload[start..Some(end)]) +/// to out_buf, explicitly clearing before. +/// +/// If payload or ttl is given, override view's one. +pub fn split_packet_0( + view: &PktView, + start: u32, + end: Option<u32>, + out_buf: &mut Vec<u8>, + payload: Option<&[u8]>, + ttl: Option<u8> +) -> Result<()> { + use etherparse::*; + + let ip = &view.ip; + let tcp = &view.tcp; + let payload = payload.unwrap_or(tcp.payload()); + + let end = end.unwrap_or(payload.len().try_into()?); + + if start > end || payload.len() < end as usize { + return Err(anyhow!("invalid index")); + } + + let opts = tcp.options(); + let mut tcp_hdr = tcp.to_header(); + tcp_hdr.sequence_number += start; + + let builder = match ip { + IpSlice::Ipv4(hdr) => { + let mut ip_hdr = hdr.header().to_header(); + if let Some(t) = ttl { ip_hdr.time_to_live = t; }; + + PacketBuilder::ip(IpHeaders::Ipv4( + ip_hdr, + hdr.extensions().to_header() + )) + }, + + IpSlice::Ipv6(hdr) => { + let mut ip6_hdr = hdr.header().to_header(); + if let Some(t) = ttl { ip6_hdr.hop_limit = t; }; + + PacketBuilder::ip(IpHeaders::Ipv6( + ip6_hdr, + Default::default() + )) + } + }.tcp_header(tcp_hdr).options_raw(opts)?; + + let payload = &payload[start as usize..end as usize]; + + out_buf.clear(); + builder.write(out_buf, payload)?; + + Ok(()) +} + +pub fn fake_clienthello( + view: &PktView, + start: u32, + end: Option<u32>, + out_buf: &mut Vec<u8> +) -> Result<()> { + split_packet_0(view, start, end, out_buf, + Some(DEFAULT_FAKE_TLS_CLIENTHELLO), Some(fake_ttl())) +} diff --git a/src/platform/linux.rs b/src/platform/linux.rs index cf6e3dd..02b174b 100644 --- a/src/platform/linux.rs +++ b/src/platform/linux.rs @@ -36,6 +36,8 @@ const DPIBREAK_CHAIN: &str = "DPIBREAK"; pub static QUEUE_NUM: OnceLock<u16> = OnceLock::new(); pub static NFT_COMMAND: OnceLock<String> = OnceLock::new(); +const INJECT_MARK: u32 = 0xD001; + fn queue_num() -> u16 { *QUEUE_NUM.get().expect("QUEUE_NUM not initialized") } @@ -143,6 +145,15 @@ fn install_iptables_rules(ipt: &IPTables) -> Result<()> { }; ipt.new_chain("mangle", DPIBREAK_CHAIN).map_err(iptables_err)?; + + // prevent inf loop + ipt.insert( + "mangle", + DPIBREAK_CHAIN, + &format!("-m mark --mark {:#x} -j RETURN", INJECT_MARK), + 1 + ).map_err(iptables_err)?; + ipt.append("mangle", DPIBREAK_CHAIN, &rule).map_err(iptables_err)?; log_println!(LogLevel::Info, "{}: new chain {} on table mangle", ipt.cmd, DPIBREAK_CHAIN); @@ -198,6 +209,26 @@ fn install_nft_rules() -> Result<()> { } } }, + // prevent inf loop + { + "add": { + "rule": { + "family": "inet", + "table": DPIBREAK_TABLE, + "chain": DPIBREAK_CHAIN, + "expr": [ + { + "match": { + "left": { "meta": { "key": "mark" }}, + "op": "==", + "right": INJECT_MARK + } + }, + { "return": null } + ] + } + } + }, { "add": { "rule": { @@ -325,16 +356,20 @@ use socket2::{Domain, Protocol, Socket, Type}; static RAW4: LazyLock<Mutex<Socket>> = LazyLock::new(|| { let sock = Socket::new(Domain::IPV4, Type::RAW, Some(Protocol::TCP)) .expect("create raw4"); - sock.set_header_included_v4(true) - .expect("IP_HDRINCL"); + + sock.set_header_included_v4(true).expect("IP_HDRINCL"); + sock.set_mark(INJECT_MARK).expect("SO_MARK"); + Mutex::new(sock) }); static RAW6: LazyLock<Mutex<Socket>> = LazyLock::new(|| { let sock = Socket::new(Domain::IPV6, Type::RAW, Some(Protocol::TCP)) .expect("create raw6"); - sock.set_header_included_v6(true) - .expect("IP_HDRINCL"); + + sock.set_header_included_v6(true).expect("IP_HDRINCL"); + sock.set_mark(INJECT_MARK).expect("SO_MARK"); + Mutex::new(sock) }); diff --git a/src/platform/windows.rs b/src/platform/windows.rs index 1708038..4d75e0e 100644 --- a/src/platform/windows.rs +++ b/src/platform/windows.rs @@ -28,7 +28,8 @@ pub static WINDIVERT_HANDLE: LazyLock<Mutex<WinDivert<NetworkLayer>>> = LazyLock const FILTER: &str = "outbound and tcp and tcp.DstPort == 443 \ and tcp.Payload[0] == 22 \ - and tcp.Payload[5] == 1"; // handshake, clienthello + and tcp.Payload[5] == 1 \ + and !impostor"; // to prevent inf loop let h = match WinDivert::network(FILTER, 0, prelude::WinDivertFlags::new()) { Ok(h) => { @@ -73,6 +74,7 @@ pub fn send_to_raw(pkt: &[u8]) -> Result<()> { p.address.set_outbound(true); p.address.set_ip_checksum(true); p.address.set_tcp_checksum(true); + p.address.set_impostor(true); // to prevent inf loop lock_handle().send(&p)?; |