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Fix panic in Babe when the sr25519 public key is invalid #1344

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merged 2 commits into from
Nov 16, 2023
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Fix panic in Babe when the sr25519 public key is invalid #1344

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736ab79
Fix panic in Babe when the sr25519 public key is invalid
tomaka Nov 16, 2023
5643fad
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tomaka Nov 16, 2023
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9 changes: 4 additions & 5 deletions lib/src/verify/babe.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -213,6 +213,8 @@ pub enum VerifyError {
InvalidBabeParametersChange(chain_information::BabeValidityError),
/// Authority index stored within block is out of range.
InvalidAuthorityIndex,
/// Public key used to for the signature is invalid.
BadPublicKey,
/// Block header signature is invalid.
BadSignature,
/// VRF proof in the block header is invalid.
Expand Down Expand Up @@ -452,12 +454,9 @@ pub fn verify_header(config: VerifyConfig) -> Result<VerifySuccess, VerifyError>
.nth(usize::try_from(authority_index).map_err(|_| VerifyError::InvalidAuthorityIndex)?)
.ok_or(VerifyError::InvalidAuthorityIndex)?;

// This `unwrap()` can only panic if `public_key` is the wrong length, which we know can't
// happen as it's of type `[u8; 32]`.
let signing_public_key = schnorrkel::PublicKey::from_bytes(signing_authority.public_key)
.unwrap_or_else(|_| unreachable!());

// Now verifying the signature in the seal.
let signing_public_key = schnorrkel::PublicKey::from_bytes(signing_authority.public_key)
.map_err(|_| VerifyError::BadPublicKey)?;
signing_public_key
.verify_simple(b"substrate", &pre_seal_hash, &seal_signature)
.map_err(|_| VerifyError::BadSignature)?;
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4 changes: 4 additions & 0 deletions wasm-node/CHANGELOG.md
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Expand Up @@ -6,6 +6,10 @@

- Smoldot will now only try opening a maximum of five connections simultaneously, then one per second. This avoids possible situations where a server is being accidentally hammered by smoldot, and avoids potentially making traffic suspicious to some ISPs. ([#1340](https://github.com/smol-dot/smoldot/pull/1340))

### Fixed

- Fix panic when verifying Babe signatures when the invalid SR25519 public key is invalid. ([#1344](https://github.com/smol-dot/smoldot/pull/1344))

## 2.0.8 - 2023-11-15

### Changed
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