_ Git - rust-lightning/blob - fuzz/fuzz_targets/channel_target.rs

   1 extern crate bitcoin;
   2 extern crate lightning;
   3 extern crate secp256k1;
   4
   5 use bitcoin::blockdata::block::BlockHeader;
   6 use bitcoin::blockdata::transaction::Transaction;
   7 use bitcoin::util::hash::Sha256dHash;
   8 use bitcoin::network::serialize::{serialize, BitcoinHash};
   9
  10 use lightning::ln::channel::Channel;
  11 use lightning::ln::channelmanager::PendingForwardHTLCInfo;
  12 use lightning::ln::msgs;
  13 use lightning::ln::msgs::MsgDecodable;
  14 use lightning::chain::chaininterface::{FeeEstimator, ConfirmationTarget};
  15
  16 use secp256k1::key::PublicKey;
  17 use secp256k1::Secp256k1;
  18
  19 use std::sync::atomic::{AtomicUsize,Ordering};
  20
  21 #[inline]
  22 pub fn slice_to_be16(v: &[u8]) -> u16 {
  23         ((v[0] as u16) << 8*1) |
  24         ((v[1] as u16) << 8*0)
  25 }
  26
  27 #[inline]
  28 pub fn slice_to_be32(v: &[u8]) -> u32 {
  29         ((v[0] as u32) << 8*3) |
  30         ((v[1] as u32) << 8*2) |
  31         ((v[2] as u32) << 8*1) |
  32         ((v[3] as u32) << 8*0)
  33 }
  34
  35 #[inline]
  36 pub fn slice_to_be64(v: &[u8]) -> u64 {
  37         ((v[0] as u64) << 8*7) |
  38         ((v[1] as u64) << 8*6) |
  39         ((v[2] as u64) << 8*5) |
  40         ((v[3] as u64) << 8*4) |
  41         ((v[4] as u64) << 8*3) |
  42         ((v[5] as u64) << 8*2) |
  43         ((v[6] as u64) << 8*1) |
  44         ((v[7] as u64) << 8*0)
  45 }
  46
  47 #[inline]
  48 fn slice_to_be24(v: &[u8]) -> u64 {
  49         //TODO: We should probably be returning a Result for channel creation, not panic!()ing on
  50         //>2**24 values...
  51         ((v[0] as u64) << 8*2) |
  52         ((v[1] as u64) << 8*1) |
  53         ((v[2] as u64) << 8*0)
  54 }
  55
  56 struct InputData<'a> {
  57         data: &'a [u8],
  58         read_pos: AtomicUsize,
  59 }
  60 impl<'a> InputData<'a> {
  61         fn get_slice(&self, len: usize) -> Option<&'a [u8]> {
  62                 let old_pos = self.read_pos.fetch_add(len, Ordering::AcqRel);
  63                 if self.data.len() < old_pos + len {
  64                         return None;
  65                 }
  66                 Some(&self.data[old_pos..old_pos + len])
  67         }
  68         fn get_slice_nonadvancing(&self, len: usize) -> Option<&'a [u8]> {
  69                 let old_pos = self.read_pos.load(Ordering::Acquire);
  70                 if self.data.len() < old_pos + len {
  71                         return None;
  72                 }
  73                 Some(&self.data[old_pos..old_pos + len])
  74         }
  75 }
  76
  77 struct FuzzEstimator<'a> {
  78         input: &'a InputData<'a>,
  79 }
  80 impl<'a> FeeEstimator for FuzzEstimator<'a> {
  81         fn get_est_sat_per_vbyte(&self, _: ConfirmationTarget) -> u64 {
  82                 //TODO: We should actually be testing at least much more than 64k...
  83                 match self.input.get_slice(2) {
  84                         Some(slice) => slice_to_be16(slice) as u64,
  85                         None => 0
  86                 }
  87         }
  88 }
  89
  90 #[inline]
  91 pub fn do_test(data: &[u8]) {
  92         let input = InputData {
  93                 data,
  94                 read_pos: AtomicUsize::new(0),
  95         };
  96         let fee_est = FuzzEstimator {
  97                 input: &input,
  98         };
  99
 100         macro_rules! get_slice {
 101                 ($len: expr) => {
 102                         match input.get_slice($len as usize) {
 103                                 Some(slice) => slice,
 104                                 None => return,
 105                         }
 106                 }
 107         }
 108
 109         macro_rules! decode_msg {
 110                 ($MsgType: path, $len: expr) => {
 111                         match <($MsgType)>::decode(get_slice!($len)) {
 112                                 Ok(msg) => msg,
 113                                 Err(e) => match e {
 114                                         msgs::DecodeError::UnknownRealmByte => return,
 115                                         msgs::DecodeError::BadPublicKey => return,
 116                                         msgs::DecodeError::BadSignature => return,
 117                                         msgs::DecodeError::ExtraAddressesPerType => return,
 118                                         msgs::DecodeError::WrongLength => panic!("We picked the length..."),
 119                                 }
 120                         }
 121                 }
 122         }
 123
 124         macro_rules! decode_msg_with_len16 {
 125                 ($MsgType: path, $begin_len: expr, $factor: expr) => {
 126                         {
 127                                 let extra_len = slice_to_be16(&match input.get_slice_nonadvancing($begin_len as usize + 2) {
 128                                         Some(slice) => slice,
 129                                         None => return,
 130                                 }[$begin_len..$begin_len + 2]);
 131                                 match <($MsgType)>::decode(get_slice!($begin_len as usize + 2 + (extra_len as usize)*$factor)) {
 132                                         Ok(msg) => msg,
 133                                         Err(e) => match e {
 134                                                 msgs::DecodeError::UnknownRealmByte => return,
 135                                                 msgs::DecodeError::BadPublicKey => return,
 136                                                 msgs::DecodeError::BadSignature => return,
 137                                                 msgs::DecodeError::ExtraAddressesPerType => return,
 138                                                 msgs::DecodeError::WrongLength => panic!("We picked the length..."),
 139                                         }
 140                                 }
 141                         }
 142                 }
 143         }
 144
 145         let secp_ctx = Secp256k1::new();
 146         macro_rules! get_pubkey {
 147                 () => {
 148                         match PublicKey::from_slice(&secp_ctx, get_slice!(33)) {
 149                                 Ok(key) => key,
 150                                 Err(_) => return,
 151                         }
 152                 }
 153         }
 154
 155         macro_rules! return_err {
 156                 ($expr: expr) => {
 157                         match $expr {
 158                                 Ok(_) => {},
 159                                 Err(_) => return,
 160                         }
 161                 }
 162         }
 163
 164         let their_pubkey = get_pubkey!();
 165
 166         let tx = Transaction { version: 0, lock_time: 0, input: Vec::new(), output: Vec::new() };
 167         let funding_output = (Sha256dHash::from_data(&serialize(&tx).unwrap()[..]), 0);
 168
 169         let mut channel = if get_slice!(1)[0] != 0 {
 170                 let mut chan = Channel::new_outbound(&fee_est, their_pubkey, slice_to_be24(get_slice!(3)), get_slice!(1)[0] == 0, slice_to_be64(get_slice!(8)));
 171                 chan.get_open_channel(Sha256dHash::from(get_slice!(32)), &fee_est).unwrap();
 172                 let accept_chan = if get_slice!(1)[0] == 0 {
 173                         decode_msg_with_len16!(msgs::AcceptChannel, 270, 1)
 174                 } else {
 175                         decode_msg!(msgs::AcceptChannel, 270)
 176                 };
 177                 return_err!(chan.accept_channel(&accept_chan));
 178                 chan.get_outbound_funding_created(funding_output.0.clone(), funding_output.1).unwrap();
 179                 let funding_signed = decode_msg!(msgs::FundingSigned, 32+64);
 180                 return_err!(chan.funding_signed(&funding_signed));
 181                 chan
 182         } else {
 183                 let open_chan = if get_slice!(1)[0] == 0 {
 184                         decode_msg_with_len16!(msgs::OpenChannel, 2*32+6*8+4+2*2+6*33+1, 1)
 185                 } else {
 186                         decode_msg!(msgs::OpenChannel, 2*32+6*8+4+2*2+6*33+1)
 187                 };
 188                 let mut chan = match Channel::new_from_req(&fee_est, their_pubkey, &open_chan, slice_to_be64(get_slice!(8)), get_slice!(1)[0] == 0) {
 189                         Ok(chan) => chan,
 190                         Err(_) => return,
 191                 };
 192                 chan.get_accept_channel().unwrap();
 193                 let mut funding_created = decode_msg!(msgs::FundingCreated, 32+32+2+64);
 194                 funding_created.funding_txid = funding_output.0.clone();
 195                 funding_created.funding_output_index = funding_output.1;
 196                 return_err!(chan.funding_created(&funding_created));
 197                 chan
 198         };
 199
 200         let mut header = BlockHeader { version: 0x20000000, prev_blockhash: Default::default(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 201         channel.block_connected(&header, 1, &[&tx; 1], &[42; 1]);
 202         for i in 2..100 {
 203                 header = BlockHeader { version: 0x20000000, prev_blockhash: header.bitcoin_hash(), merkle_root: Default::default(), time: 42, bits: 42, nonce: 42 };
 204                 channel.block_connected(&header, i, &[&tx; 0], &[0; 0]);
 205         }
 206
 207         let funding_locked = decode_msg!(msgs::FundingLocked, 32+33);
 208         return_err!(channel.funding_locked(&funding_locked));
 209
 210         loop {
 211                 match get_slice!(1)[0] {
 212                         0 => {
 213                                 return_err!(channel.send_htlc(slice_to_be64(get_slice!(8)), [42; 32], slice_to_be32(get_slice!(4)), msgs::OnionPacket {
 214                                         version: get_slice!(1)[0],
 215                                         public_key: get_pubkey!(),
 216                                         hop_data: [0; 20*65],
 217                                         hmac: [0; 32],
 218                                 }));
 219                         },
 220                         1 => {
 221                                 return_err!(channel.send_commitment());
 222                         },
 223                         2 => {
 224                                 let update_add_htlc = decode_msg!(msgs::UpdateAddHTLC, 32+8+8+32+4+4+33+20*65+32);
 225                                 return_err!(channel.update_add_htlc(&update_add_htlc, PendingForwardHTLCInfo::dummy()));
 226                         },
 227                         3 => {
 228                                 let update_fulfill_htlc = decode_msg!(msgs::UpdateFulfillHTLC, 32 + 8 + 32);
 229                                 return_err!(channel.update_fulfill_htlc(&update_fulfill_htlc));
 230                         },
 231                         4 => {
 232                                 let update_fail_htlc = decode_msg_with_len16!(msgs::UpdateFailHTLC, 32 + 8, 1);
 233                                 return_err!(channel.update_fail_htlc(&update_fail_htlc));
 234                         },
 235                         5 => {
 236                                 let update_fail_malformed_htlc = decode_msg!(msgs::UpdateFailMalformedHTLC, 32+8+32+2);
 237                                 return_err!(channel.update_fail_malformed_htlc(&update_fail_malformed_htlc));
 238                         },
 239                         6 => {
 240                                 let commitment_signed = decode_msg_with_len16!(msgs::CommitmentSigned, 32+64, 64);
 241                                 return_err!(channel.commitment_signed(&commitment_signed));
 242                         },
 243                         7 => {
 244                                 let revoke_and_ack = decode_msg!(msgs::RevokeAndACK, 32+32+33);
 245                                 return_err!(channel.revoke_and_ack(&revoke_and_ack));
 246                         },
 247                         8 => {
 248                                 let update_fee = decode_msg!(msgs::UpdateFee, 32+4);
 249                                 return_err!(channel.update_fee(&fee_est, &update_fee));
 250                         },
 251                         9 => {
 252                                 let shutdown = decode_msg_with_len16!(msgs::Shutdown, 32, 1);
 253                                 return_err!(channel.shutdown(&fee_est, &shutdown));
 254                         },
 255                         10 => {
 256                                 let closing_signed = decode_msg!(msgs::ClosingSigned, 32+8+64);
 257                                 return_err!(channel.closing_signed(&fee_est, &closing_signed));
 258                         },
 259                         _ => return,
 260                 }
 261         }
 262 }
 263
 264 #[cfg(feature = "afl")]
 265 extern crate afl;
 266 #[cfg(feature = "afl")]
 267 fn main() {
 268         afl::read_stdio_bytes(|data| {
 269                 do_test(&data);
 270         });
 271 }
 272
 273 #[cfg(feature = "honggfuzz")]
 274 #[macro_use] extern crate honggfuzz;
 275 #[cfg(feature = "honggfuzz")]
 276 fn main() {
 277         loop {
 278                 fuzz!(|data| {
 279                         do_test(data);
 280                 });
 281         }
 282 }
 283
 284 #[cfg(test)]
 285 mod tests {
 286         fn extend_vec_from_hex(hex: &str, out: &mut Vec<u8>) {
 287                 let mut b = 0;
 288                 for (idx, c) in hex.as_bytes().iter().enumerate() {
 289                         b <<= 4;
 290                         match *c {
 291                                 b'A'...b'F' => b |= c - b'A' + 10,
 292                                 b'a'...b'f' => b |= c - b'a' + 10,
 293                                 b'0'...b'9' => b |= c - b'0',
 294                                 _ => panic!("Bad hex"),
 295                         }
 296                         if (idx & 1) == 1 {
 297                                 out.push(b);
 298                                 b = 0;
 299                         }
 300                 }
 301         }
 302
 303         #[test]
 304         fn duplicate_crash() {
 305                 let mut a = Vec::new();
 306                 extend_vec_from_hex("00", &mut a);
 307                 super::do_test(&a);
 308         }
 309 }