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Verify signature and session index during apply phase of im-online. (#3418)

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* Verify signature and session index during apply phase of im-online.

* Bump impl_version.

* Add docs to SignedExtension
This commit is contained in:
Tomasz Drwięga
2019-08-16 12:59:02 +02:00
committed by Gavin Wood
parent c94e0f28b4
commit 42fb0c7cad
3 changed files with 48 additions and 7 deletions
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substrate/srml/im-online/src/lib.rs
+8 -2
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@@ -77,7 +77,7 @@ use rstd::prelude::*;
use session::SessionIndex;
use sr_io::Printable;
use srml_support::{
StorageValue, decl_module, decl_event, decl_storage, StorageDoubleMap, print,
StorageValue, decl_module, decl_event, decl_storage, StorageDoubleMap, print, ensure
};
use system::ensure_none;
use app_crypto::RuntimeAppPublic;
@@ -206,11 +206,12 @@ decl_module! {
fn heartbeat(
origin,
heartbeat: Heartbeat<T::BlockNumber>,
_signature: AuthoritySignature
signature: AuthoritySignature
) {
ensure_none(origin)?;
let current_session = <session::Module<T>>::current_index();
ensure!(current_session == heartbeat.session_index, "Outdated hearbeat received.");
let exists = <ReceivedHeartbeats>::exists(
&current_session,
&heartbeat.authority_index
@@ -218,6 +219,11 @@ decl_module! {
let keys = Keys::get();
let public = keys.get(heartbeat.authority_index as usize);
if let (true, Some(public)) = (!exists, public) {
let signature_valid = heartbeat.using_encoded(|encoded_heartbeat| {
public.verify(&encoded_heartbeat, &signature)
});
ensure!(signature_valid, "Invalid hearbeat signature.");
Self::deposit_event(Event::HeartbeatReceived(public.clone()));
let network_state = heartbeat.network_state.encode();