jhwgh1968
Homu
parent
1bdf155ead
commit
4f4b209103
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@ -7,12 +7,18 @@ publish = false
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[package.metadata]
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cargo-fuzz = true
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[dependencies]
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getopts = "0.2"
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[dependencies.smoltcp]
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path = ".."
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[dependencies.libfuzzer-sys]
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git = "https://github.com/rust-fuzz/libfuzzer-sys.git"
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[profile.release]
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codegen-units = 1 # needed to prevent weird linker error about sancov guards
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# Prevent this from interfering with workspaces
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[workspace]
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members = ["."]
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@ -20,3 +26,7 @@ members = ["."]
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[[bin]]
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name = "packet_parser"
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path = "fuzz_targets/packet_parser.rs"
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[[bin]]
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name = "tcp_headers"
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path = "fuzz_targets/tcp_headers.rs"
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@ -0,0 +1,209 @@
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#![no_main]
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#[macro_use] extern crate libfuzzer_sys;
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extern crate smoltcp;
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use std as core;
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extern crate getopts;
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use core::cmp;
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use smoltcp::phy::Loopback;
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use smoltcp::wire::{EthernetAddress, EthernetFrame, EthernetProtocol};
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use smoltcp::wire::{IpAddress, IpCidr, Ipv4Packet, Ipv6Packet, TcpPacket};
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use smoltcp::iface::{NeighborCache, EthernetInterfaceBuilder};
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use smoltcp::socket::{SocketSet, TcpSocket, TcpSocketBuffer};
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use smoltcp::time::{Duration, Instant};
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mod utils {
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include!("../utils.rs");
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}
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mod mock {
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use std::sync::Arc;
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use std::sync::atomic::{Ordering, AtomicUsize};
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use smoltcp::time::{Duration, Instant};
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// should be AtomicU64 but that's unstable
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#[derive(Debug, Clone)]
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pub struct Clock(Arc<AtomicUsize>);
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impl Clock {
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pub fn new() -> Clock {
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Clock(Arc::new(AtomicUsize::new(0)))
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}
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pub fn advance(&self, duration: Duration) {
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self.0.fetch_add(duration.total_millis() as usize, Ordering::SeqCst);
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}
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pub fn elapsed(&self) -> Instant {
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Instant::from_millis(self.0.load(Ordering::SeqCst) as i64)
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}
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}
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}
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struct TcpHeaderFuzzer([u8; 56], usize);
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impl TcpHeaderFuzzer {
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// The fuzzer won't fuzz any packets with the SYN flag set in order to make sure the connection
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// is established before the fuzzed headers arrive.
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//
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// It will also not fuzz the source and dest port so it reaches the open socket.
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//
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// Otherwise, it replaces the entire rest of the TCP header with the fuzzer's output.
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pub fn new(data: &[u8]) -> TcpHeaderFuzzer {
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let copy_len = cmp::min(data.len(), 56 /* max TCP header length without port numbers*/);
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let mut fuzzer = TcpHeaderFuzzer([0; 56], copy_len);
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fuzzer.0[..copy_len].copy_from_slice(&data[..copy_len]);
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fuzzer
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}
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}
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impl smoltcp::phy::Fuzzer for TcpHeaderFuzzer {
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fn fuzz_packet(&self, frame_data: &mut [u8]) {
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if self.1 == 0 {
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return;
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}
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let tcp_packet_offset = {
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let eth_frame = EthernetFrame::new_unchecked(&frame_data);
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EthernetFrame::<&mut [u8]>::header_len() + match eth_frame.ethertype() {
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EthernetProtocol::Ipv4 =>
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Ipv4Packet::new_unchecked(eth_frame.payload()).header_len() as usize,
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EthernetProtocol::Ipv6 =>
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Ipv6Packet::new_unchecked(eth_frame.payload()).header_len() as usize,
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_ => return
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}
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};
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let tcp_is_syn = {
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let tcp_packet = TcpPacket::new_checked(&frame_data[tcp_packet_offset..]).unwrap();
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tcp_packet.syn()
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};
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if tcp_is_syn {
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return;
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}
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if !frame_data.ends_with(b"abcdef") {
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return;
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}
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let tcp_header_len = {
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let tcp_packet = &frame_data[tcp_packet_offset..];
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(tcp_packet[12] as usize >> 4) * 4
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};
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let tcp_packet = &mut frame_data[tcp_packet_offset+4..];
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let replacement_data = &self.0[..self.1];
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let copy_len = cmp::min(replacement_data.len(), tcp_header_len);
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assert!(copy_len < tcp_packet.len());
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tcp_packet[..copy_len].copy_from_slice(&replacement_data[..copy_len]);
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}
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}
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struct EmptyFuzzer();
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impl smoltcp::phy::Fuzzer for EmptyFuzzer {
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fn fuzz_packet(&self, _: &mut [u8]) {}
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}
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fuzz_target!(|data: &[u8]| {
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let clock = mock::Clock::new();
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let device = {
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let (mut opts, mut free) = utils::create_options();
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utils::add_middleware_options(&mut opts, &mut free);
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let mut matches = utils::parse_options(&opts, free);
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let device = utils::parse_middleware_options(&mut matches, Loopback::new(),
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/*loopback=*/true);
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smoltcp::phy::FuzzInjector::new(device,
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EmptyFuzzer(),
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TcpHeaderFuzzer::new(data))
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};
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let mut neighbor_cache_entries = [None; 8];
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let neighbor_cache = NeighborCache::new(&mut neighbor_cache_entries[..]);
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let ip_addrs = [IpCidr::new(IpAddress::v4(127, 0, 0, 1), 8)];
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let mut iface = EthernetInterfaceBuilder::new(device)
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.ethernet_addr(EthernetAddress::default())
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.neighbor_cache(neighbor_cache)
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.ip_addrs(ip_addrs)
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.finalize();
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let server_socket = {
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// It is not strictly necessary to use a `static mut` and unsafe code here, but
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// on embedded systems that smoltcp targets it is far better to allocate the data
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// statically to verify that it fits into RAM rather than get undefined behavior
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// when stack overflows.
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static mut TCP_SERVER_RX_DATA: [u8; 1024] = [0; 1024];
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static mut TCP_SERVER_TX_DATA: [u8; 1024] = [0; 1024];
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let tcp_rx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_RX_DATA[..] });
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let tcp_tx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_SERVER_TX_DATA[..] });
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TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer)
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};
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let client_socket = {
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static mut TCP_CLIENT_RX_DATA: [u8; 1024] = [0; 1024];
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static mut TCP_CLIENT_TX_DATA: [u8; 1024] = [0; 1024];
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let tcp_rx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_CLIENT_RX_DATA[..] });
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let tcp_tx_buffer = TcpSocketBuffer::new(unsafe { &mut TCP_CLIENT_TX_DATA[..] });
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TcpSocket::new(tcp_rx_buffer, tcp_tx_buffer)
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};
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let mut socket_set_entries: [_; 2] = Default::default();
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let mut socket_set = SocketSet::new(&mut socket_set_entries[..]);
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let server_handle = socket_set.add(server_socket);
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let client_handle = socket_set.add(client_socket);
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let mut did_listen = false;
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let mut did_connect = false;
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let mut done = false;
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while !done && clock.elapsed() < Instant::from_millis(4_000) {
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let _ = iface.poll(&mut socket_set, clock.elapsed());
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{
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let mut socket = socket_set.get::<TcpSocket>(server_handle);
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if !socket.is_active() && !socket.is_listening() {
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if !did_listen {
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socket.listen(1234).unwrap();
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did_listen = true;
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}
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}
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if socket.can_recv() {
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socket.close();
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done = true;
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}
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}
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{
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let mut socket = socket_set.get::<TcpSocket>(client_handle);
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if !socket.is_open() {
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if !did_connect {
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socket.connect((IpAddress::v4(127, 0, 0, 1), 1234),
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(IpAddress::Unspecified, 65000)).unwrap();
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did_connect = true;
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}
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}
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if socket.can_send() {
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socket.send_slice(b"0123456789abcdef0123456789abcdef0123456789abcdef").unwrap();
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socket.close();
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}
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}
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match iface.poll_delay(&socket_set, clock.elapsed()) {
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Some(Duration { millis: 0 }) => {},
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Some(delay) => {
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clock.advance(delay)
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},
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None => clock.advance(Duration::from_millis(1))
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}
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}
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});
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@ -0,0 +1,95 @@
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// TODO: this is literally a copy of examples/utils.rs, but without an allow dead code attribute.
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// The include logic does not allow having attributes in included files.
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use std::cell::RefCell;
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use std::str::{self, FromStr};
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use std::rc::Rc;
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use std::io;
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use std::fs::File;
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use std::time::{SystemTime, UNIX_EPOCH};
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use std::env;
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use std::process;
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use getopts::{Options, Matches};
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use smoltcp::phy::{Device, EthernetTracer, FaultInjector};
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use smoltcp::phy::{PcapWriter, PcapSink, PcapMode, PcapLinkType};
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use smoltcp::time::Duration;
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pub fn create_options() -> (Options, Vec<&'static str>) {
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let mut opts = Options::new();
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opts.optflag("h", "help", "print this help menu");
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(opts, Vec::new())
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}
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pub fn parse_options(options: &Options, free: Vec<&str>) -> Matches {
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match options.parse(env::args().skip(1)) {
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Err(err) => {
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println!("{}", err);
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process::exit(1)
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}
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Ok(matches) => {
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if matches.opt_present("h") || matches.free.len() != free.len() {
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let brief = format!("Usage: {} [OPTION]... {}",
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env::args().nth(0).unwrap(), free.join(" "));
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print!("{}", options.usage(&brief));
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process::exit(if matches.free.len() != free.len() { 1 } else { 0 })
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}
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matches
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}
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}
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}
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pub fn add_middleware_options(opts: &mut Options, _free: &mut Vec<&str>) {
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opts.optopt("", "pcap", "Write a packet capture file", "FILE");
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opts.optopt("", "drop-chance", "Chance of dropping a packet (%)", "CHANCE");
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opts.optopt("", "corrupt-chance", "Chance of corrupting a packet (%)", "CHANCE");
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opts.optopt("", "size-limit", "Drop packets larger than given size (octets)", "SIZE");
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opts.optopt("", "tx-rate-limit", "Drop packets after transmit rate exceeds given limit \
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(packets per interval)", "RATE");
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opts.optopt("", "rx-rate-limit", "Drop packets after transmit rate exceeds given limit \
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(packets per interval)", "RATE");
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opts.optopt("", "shaping-interval", "Sets the interval for rate limiting (ms)", "RATE");
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}
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pub fn parse_middleware_options<D>(matches: &mut Matches, device: D, loopback: bool)
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-> FaultInjector<EthernetTracer<PcapWriter<D, Rc<PcapSink>>>>
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where D: for<'a> Device<'a>
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{
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let drop_chance = matches.opt_str("drop-chance").map(|s| u8::from_str(&s).unwrap())
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.unwrap_or(0);
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let corrupt_chance = matches.opt_str("corrupt-chance").map(|s| u8::from_str(&s).unwrap())
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.unwrap_or(0);
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let size_limit = matches.opt_str("size-limit").map(|s| usize::from_str(&s).unwrap())
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.unwrap_or(0);
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let tx_rate_limit = matches.opt_str("tx-rate-limit").map(|s| u64::from_str(&s).unwrap())
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.unwrap_or(0);
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let rx_rate_limit = matches.opt_str("rx-rate-limit").map(|s| u64::from_str(&s).unwrap())
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.unwrap_or(0);
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let shaping_interval = matches.opt_str("shaping-interval").map(|s| u64::from_str(&s).unwrap())
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.unwrap_or(0);
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let pcap_writer: Box<io::Write>;
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if let Some(pcap_filename) = matches.opt_str("pcap") {
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pcap_writer = Box::new(File::create(pcap_filename).expect("cannot open file"))
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} else {
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pcap_writer = Box::new(io::sink())
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}
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let seed = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().subsec_nanos();
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let device = PcapWriter::new(device, Rc::new(RefCell::new(pcap_writer)) as Rc<PcapSink>,
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if loopback { PcapMode::TxOnly } else { PcapMode::Both },
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PcapLinkType::Ethernet);
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let device = EthernetTracer::new(device, |_timestamp, _printer| {
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#[cfg(feature = "log")]
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trace!("{}", _printer);
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});
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let mut device = FaultInjector::new(device, seed);
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device.set_drop_chance(drop_chance);
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device.set_corrupt_chance(corrupt_chance);
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device.set_max_packet_size(size_limit);
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device.set_max_tx_rate(tx_rate_limit);
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device.set_max_rx_rate(rx_rate_limit);
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device.set_bucket_interval(Duration::from_millis(shaping_interval));
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device
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}
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