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stricter size verification

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This commit is contained in:
keorn 2016-12-02 13:30:43 +00:00
parent f0e9eae244
commit 2c8c090598
1 changed files with 72 additions and 25 deletions
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95
ethcore/src/engines/tendermint/mod.rs
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@ -56,8 +56,6 @@ pub type Height = usize;
pub type Round = usize;
pub type BlockHash = H256;
type Signatures = Vec<Bytes>;
/// Engine using `Tendermint` consensus algorithm, suitable for EVM chain.
pub struct Tendermint {
params: CommonParams,
@ -153,6 +151,7 @@ impl Tendermint {
match ap.sign(*authority, self.password.read().clone(), vote_info.sha3()).map(Into::into) {
Ok(signature) => {
let message_rlp = message_full_rlp(&signature, &vote_info);
// TODO: memoize the rlp for consecutive broadcasts
self.votes.vote(ConsensusMessage::new(signature, h, r, *s, block_hash), *authority);
Some(message_rlp)
},
@ -173,16 +172,22 @@ impl Tendermint {
}
}
fn broadcast_old_messages(&self) {
if let Some(ref lc) = *self.lock_change.read() {
for m in self.votes.get_older_than(lc).into_iter() {
self.broadcast_message(m);
}
}
}
fn to_step(&self, step: Step) {
*self.step.write() = step;
match step {
Step::Propose => {
trace!(target: "poa", "to_step: Propose.");
*self.proposal.write() = None;
self.update_sealing()
},
Step::Prevote => {
trace!(target: "poa", "to_step: Prevote.");
let block_hash = match *self.lock_change.read() {
Some(ref m) if self.should_unlock(m.round) => self.proposal.read().clone(),
Some(ref m) => m.block_hash,
@ -191,7 +196,6 @@ impl Tendermint {
self.generate_and_broadcast_message(block_hash);
},
Step::Precommit => {
trace!(target: "poa", "to_step: Precommit.");
let block_hash = match *self.lock_change.read() {
Some(ref m) if self.is_round(m) => {
self.last_lock.store(m.round, AtomicOrdering::SeqCst);
@ -202,7 +206,7 @@ impl Tendermint {
self.generate_and_broadcast_message(block_hash);
},
Step::Commit => {
trace!(target: "poa", "to_step: Commit.");
debug!(target: "poa", "to_step: Commit.");
// Commit the block using a complete signature set.
let round = self.round.load(AtomicOrdering::SeqCst);
if let Some(block_hash) = *self.proposal.read() {
@ -251,10 +255,12 @@ impl Tendermint {
}
fn increment_round(&self, n: Round) {
debug!(target: "poa", "increment_round: New round.");
self.round.fetch_add(n, AtomicOrdering::SeqCst);
}
fn reset_round(&self) {
debug!(target: "poa", "reset_round: New height.");
self.last_lock.store(0, AtomicOrdering::SeqCst);
self.height.fetch_add(1, AtomicOrdering::SeqCst);
self.round.store(0, AtomicOrdering::SeqCst);
@ -386,7 +392,7 @@ impl Engine for Tendermint {
if is_newer_than_lock
&& message.step == Step::Prevote
&& self.has_enough_aligned_votes(&message) {
trace!(target: "poa", "handle_message: Lock change.");
debug!(target: "poa", "handle_message: Lock change.");
*self.lock_change.write() = Some(message.clone());
}
// Check if it can affect the step transition.
@ -424,15 +430,24 @@ impl Engine for Tendermint {
}
fn verify_block_basic(&self, header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
// TODO: check total length of the last field
let seal_length = header.seal().len();
if seal_length == self.seal_fields() {
let signatures_len = header.seal()[2].len();
if signatures_len >= 1 {
Ok(())
} else {
Err(From::from(EngineError::BadSealFieldSize(OutOfBounds {
min: Some(1),
max: None,
found: signatures_len
})))
}
} else {
Err(From::from(BlockError::InvalidSealArity(
Mismatch { expected: self.seal_fields(), found: seal_length }
)))
}
}
fn verify_block_unordered(&self, header: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
@ -441,11 +456,13 @@ impl Engine for Tendermint {
if !self.is_authority(&proposer) {
try!(Err(EngineError::NotAuthorized(proposer)))
}
let precommit_hash = proposal.precommit_hash();
// TODO: use addresses recovered during precommit vote
let ref signatures_field = header.seal()[2];
let mut signature_count = 0;
let mut origins = HashSet::new();
for rlp in UntrustedRlp::new(&header.seal()[2]).iter() {
for rlp in UntrustedRlp::new(signatures_field).iter() {
let signature: H520 = try!(rlp.as_val());
let address = public_to_address(&try!(recover(&signature.into(), &precommit_hash)));
if !self.our_params.authorities.contains(&address) {
@ -455,12 +472,22 @@ impl Engine for Tendermint {
if origins.insert(address) {
signature_count += 1;
} else {
warn!(target: "poa", "verify_block_unordered: Duplicate signature from {} on the seal.", address)
warn!(target: "poa", "verify_block_unordered: Duplicate signature from {} on the seal.", address);
try!(Err(BlockError::InvalidSeal));
}
}
// Check if its just a proposal if there is not enough precommits.
// Check if its a proposal if there is not enough precommits.
if !self.is_above_threshold(signature_count) {
let signatures_len = signatures_field.len();
// Proposal has to have an empty signature list.
if signatures_len != 1 {
try!(Err(EngineError::BadSealFieldSize(OutOfBounds {
min: Some(1),
max: Some(1),
found: signatures_len
})));
}
try!(self.is_proposer(&proposer));
*self.proposal.write() = proposal.block_hash.clone();
self.votes.vote(proposal, proposer);
@ -470,17 +497,28 @@ impl Engine for Tendermint {
}
fn verify_block_family(&self, header: &Header, parent: &Header, _block: Option<&[u8]>) -> Result<(), Error> {
// we should not calculate difficulty for genesis blocks
if header.number() == 0 {
return Err(From::from(BlockError::RidiculousNumber(OutOfBounds { min: Some(1), max: None, found: header.number() })));
try!(Err(BlockError::RidiculousNumber(OutOfBounds { min: Some(1), max: None, found: header.number() })));
}
let gas_limit_divisor = self.our_params.gas_limit_bound_divisor;
let min_gas = parent.gas_limit().clone() - parent.gas_limit().clone() / gas_limit_divisor;
let max_gas = parent.gas_limit().clone() + parent.gas_limit().clone() / gas_limit_divisor;
if header.gas_limit() <= &min_gas || header.gas_limit() >= &max_gas {
return Err(From::from(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit().clone() })));
try!(Err(BlockError::InvalidGasLimit(OutOfBounds { min: Some(min_gas), max: Some(max_gas), found: header.gas_limit().clone() })));
}
// Commit is longer than empty signature list.
let parent_signature_len = parent.seal()[2].len();
if parent_signature_len < 1 {
try!(Err(EngineError::BadSealFieldSize(OutOfBounds {
// One signature.
min: Some(136),
max: None,
found: parent_signature_len
})));
}
Ok(())
}
@ -571,7 +609,7 @@ mod tests {
vec![
::rlp::encode(&round).to_vec(),
::rlp::encode(&H520::from(signature)).to_vec(),
Vec::new()
::rlp::EMPTY_LIST_RLP.to_vec()
]
}
@ -681,21 +719,30 @@ mod tests {
header.set_author(proposer);
let mut seal = proposal_seal(&tap, &header, 0);
let voter = insert_and_unlock(&tap, "1");
let vote_info = message_info_rlp(0, 0, Step::Precommit, Some(header.bare_hash()));
let signature = tap.sign(voter, None, vote_info.sha3()).unwrap();
seal[2] = ::rlp::encode(&vec![H520::from(signature.clone())]).to_vec();
let signature1 = tap.sign(proposer, None, vote_info.sha3()).unwrap();
seal[2] = ::rlp::encode(&vec![H520::from(signature1.clone())]).to_vec();
header.set_seal(seal.clone());
// One good signature is not enough.
match engine.verify_block_unordered(&header, None) {
Err(Error::Engine(EngineError::BadSealFieldSize(_))) => {},
_ => panic!(),
}
let voter = insert_and_unlock(&tap, "0");
let signature0 = tap.sign(voter, None, vote_info.sha3()).unwrap();
seal[2] = ::rlp::encode(&vec![H520::from(signature1.clone()), H520::from(signature0.clone())]).to_vec();
header.set_seal(seal.clone());
// One good signature.
assert!(engine.verify_block_unordered(&header, None).is_ok());
let bad_voter = insert_and_unlock(&tap, "101");
let bad_signature = tap.sign(bad_voter, None, vote_info.sha3()).unwrap();
seal[2] = ::rlp::encode(&vec![H520::from(signature), H520::from(bad_signature)]).to_vec();
seal[2] = ::rlp::encode(&vec![H520::from(signature1), H520::from(bad_signature)]).to_vec();
header.set_seal(seal);
// One good and one bad signature.
@ -717,7 +764,6 @@ mod tests {
#[test]
fn step_transitioning() {
::env_logger::init().unwrap();
let (spec, tap) = setup();
let engine = spec.engine.clone();
let mut db_result = get_temp_state_db();
@ -758,16 +804,17 @@ mod tests {
#[test]
fn timeout_transitioning() {
::env_logger::init().unwrap();
let (spec, tap) = setup();
let engine = spec.engine.clone();
let mut db_result = get_temp_state_db();
let mut db = db_result.take();
spec.ensure_db_good(&mut db, &TrieFactory::new(TrieSpec::Secure)).unwrap();
println!("{:?}", ::rlp::EMPTY_LIST_RLP.to_vec().len());
println!("{:?}", ::rlp::encode(&vec![H520::default()]).to_vec().len());
let v = insert_and_register(&tap, &engine, "0");
::std::thread::sleep(::std::time::Duration::from_millis(15000));
println!("done");
}
}