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Ease parachain candidate code fetching (#2593)

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* code stored in para + modify CandidateDescriptor.

* WIP: digest + some more impl

* validation_code_hash in payload + check in inclusion

* check in client + refator

* tests

* fix encoding indices

* remove old todos

* fix test

* fix test

* add test

* fetch validation code inside collation-generation from the relay-chain

* HashMismatch -> PoVHashMismatch + miscompilation

* refactor, store hash when needed

* storage rename: more specific but slightly too verbose

* do not hash on candidate validation, fetch hash instead

* better test

* fix test

* guide updates

* don't panic in runtime

Co-authored-by: Robert Habermeier <rphmeier@gmail.com>
This commit is contained in:
Guillaume Thiolliere
2021-04-01 23:55:39 +02:00
committed by GitHub
parent 98082c5326
commit beca01f118
15 changed files with 494 additions and 102 deletions
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polkadot/primitives/src/v1.rs
+14 -2
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@@ -211,14 +211,16 @@ pub fn collator_signature_payload<H: AsRef<[u8]>>(
para_id: &Id,
persisted_validation_data_hash: &Hash,
pov_hash: &Hash,
) -> [u8; 100] {
validation_code_hash: &Hash,
) -> [u8; 132] {
// 32-byte hash length is protected in a test below.
let mut payload = [0u8; 100];
let mut payload = [0u8; 132];
payload[0..32].copy_from_slice(relay_parent.as_ref());
u32::from(*para_id).using_encoded(|s| payload[32..32 + s.len()].copy_from_slice(s));
payload[36..68].copy_from_slice(persisted_validation_data_hash.as_ref());
payload[68..100].copy_from_slice(pov_hash.as_ref());
payload[100..132].copy_from_slice(validation_code_hash.as_ref());
payload
}
@@ -228,6 +230,7 @@ fn check_collator_signature<H: AsRef<[u8]>>(
para_id: &Id,
persisted_validation_data_hash: &Hash,
pov_hash: &Hash,
validation_code_hash: &Hash,
collator: &CollatorId,
signature: &CollatorSignature,
) -> Result<(),()> {
@@ -236,6 +239,7 @@ fn check_collator_signature<H: AsRef<[u8]>>(
para_id,
persisted_validation_data_hash,
pov_hash,
validation_code_hash,
);
if signature.verify(&payload[..], collator) {
@@ -268,6 +272,8 @@ pub struct CandidateDescriptor<H = Hash> {
pub signature: CollatorSignature,
/// Hash of the para header that is being generated by this candidate.
pub para_head: Hash,
/// The blake2-256 hash of the validation code bytes.
pub validation_code_hash: Hash,
}
impl<H: AsRef<[u8]>> CandidateDescriptor<H> {
@@ -278,6 +284,7 @@ impl<H: AsRef<[u8]>> CandidateDescriptor<H> {
&self.para_id,
&self.persisted_validation_data_hash,
&self.pov_hash,
&self.validation_code_hash,
&self.collator,
&self.signature,
)
@@ -872,6 +879,10 @@ sp_api::decl_runtime_apis! {
/// messages in them are also included.
#[skip_initialize_block]
fn inbound_hrmp_channels_contents(recipient: Id) -> BTreeMap<Id, Vec<InboundHrmpMessage<N>>>;
/// Get the validation code from its hash.
#[skip_initialize_block]
fn validation_code_by_hash(hash: Hash) -> Option<ValidationCode>;
}
}
@@ -1107,6 +1118,7 @@ mod tests {
&5u32.into(),
&Hash::repeat_byte(2),
&Hash::repeat_byte(3),
&Hash::repeat_byte(4),
);
}
}