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detect different node, same-key signing in aura #7245

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Dec 15, 2017
Merged

detect different node, same-key signing in aura #7245

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b450653
detect different node, same-key signing in aura
rphmeier Dec 8, 2017
583d764
reduce scope of warning
rphmeier Dec 11, 2017
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8 changes: 8 additions & 0 deletions ethcore/src/engines/authority_round/mod.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -485,6 +485,7 @@ impl Engine<EthereumMachine> for AuthorityRound {
.expect("Header has been verified; qed").into();

let step = self.step.load();

let expected_diff = calculate_score(parent_step, step.into());

if header.difficulty() != &expected_diff {
Expand Down Expand Up @@ -517,6 +518,13 @@ impl Engine<EthereumMachine> for AuthorityRound {
};

if is_step_proposer(validators, header.parent_hash(), step, header.author()) {
// this is guarded against by `can_propose` unless the block was signed
// on the same step (implies same key) and on a different node.
if parent_step == step.into() {
warn!("Attempted to seal block on the same step as parent. Is this authority sealing with more than one node?");
return Seal::None;
}

if let Ok(signature) = self.sign(header.bare_hash()) {
trace!(target: "engine", "generate_seal: Issuing a block for step {}.", step);

Expand Down