diff options
Diffstat (limited to 'src/pkt.rs')
| -rw-r--r-- | src/pkt.rs | 124 |
1 files changed, 37 insertions, 87 deletions
@@ -18,6 +18,7 @@ use anyhow::Result; use etherparse::{IpSlice, TcpSlice}; use anyhow::anyhow; +#[cfg(target_os = "linux")] use std::sync::atomic::Ordering; #[cfg(debug_assertions)] @@ -28,91 +29,49 @@ use crate::opt; use crate::platform; use crate::tls; +mod fake; +mod hoptab; + #[cfg(debug_assertions)] use log::LogLevel; -/// 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 struct PktView<'a> { - pub ip: IpSlice<'a>, - pub tcp: TcpSlice<'a> +struct PktView<'a> { + ip: IpSlice<'a>, + tcp: TcpSlice<'a> } impl<'a> PktView<'a> { #[inline] - pub fn from_raw(raw: &'a [u8]) -> Result<Self> { + fn from_raw(raw: &'a [u8]) -> Result<Self> { let ip = IpSlice::from_slice(raw)?; let tcp = TcpSlice::from_slice(ip.payload().payload)?; Ok(Self { ip, tcp }) } + + fn ttl(&self) -> u8 { + use etherparse::IpSlice; + + match &self.ip { + IpSlice::Ipv4(v4) => v4.header().ttl(), + IpSlice::Ipv6(v6) => v6.header().hop_limit() + } + } + + fn saddr(&self) -> std::net::IpAddr { + self.ip.source_addr() + } + + fn daddr(&self) -> std::net::IpAddr { + self.ip.destination_addr() + } } /// Write TCP/IP packet (payload = view.tcp.payload[start..Some(end)]) /// to out_buf, explicitly clearing before. /// /// If payload, ttl or tcp_checksum is given, override view's one. -pub fn split_packet_0( +fn split_packet_0( view: &PktView, start: u32, end: Option<u32>, @@ -183,25 +142,6 @@ pub fn split_packet_0( Ok(()) } -fn fake_clienthello( - view: &PktView, - start: u32, - end: Option<u32>, - out_buf: &mut Vec<u8> -) -> Result<()> { - - let tcp_checksum = if opt::fake_badsum() { - Some(0) - } else { - None - }; - - split_packet_0(view, start, end, out_buf, - Some(DEFAULT_FAKE_TLS_CLIENTHELLO), - Some(opt::fake_ttl()), - tcp_checksum) -} - fn split_packet( view: &PktView, start: u32, @@ -220,7 +160,7 @@ fn send_segment( use platform::send_to_raw; if opt::fake() { - fake_clienthello(view, start, end, buf)?; + fake::fake_clienthello(view, start, end, buf)?; send_to_raw(buf)?; } split_packet(view, start, end, buf)?; @@ -247,6 +187,11 @@ fn split_packet_1(view: &PktView, order: &[u32], buf: &mut Vec<u8>) -> Result<() Ok(()) } +fn is_synack_from_443(view: &PktView) -> bool { + // sport == 443 and flags SYN+ACK + view.tcp.source_port() == 443 && view.tcp.syn() && view.tcp.ack() +} + /// Return Ok(true) if packet is handled pub fn handle_packet(pkt: &[u8], buf: &mut Vec::<u8>) -> Result<bool> { #[cfg(target_os = "linux")] @@ -257,6 +202,11 @@ pub fn handle_packet(pkt: &[u8], buf: &mut Vec::<u8>) -> Result<bool> { let view = PktView::from_raw(pkt)?; + if opt::fake_autottl() && is_synack_from_443(&view) { + fake::saddr_hop_put(&view); + return Ok(false); + } + if !is_filtered && !tls::is_client_hello(view.tcp.payload()) { return Ok(false); } |