!feat(evm): Reject not replay-protected tx to prevent replay attack (#1124)

* Reject not replay-protected tx to prevent replay attack

Closes: #1122

- reject such txs in ante handler

* add reject unprotected parameter

* Update CHANGELOG.md

* Apply suggestions from code review

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* pr suggestions

* add unit test case

* Reject not replay-protected tx to prevent replay attack

Closes: #1122

- reject such txs in ante handler

add reject unprotected parameter

Update CHANGELOG.md

Apply suggestions from code review

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

pr suggestions

add unit test case

use var

* add migrations

* Apply suggestions from code review

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

* rename

* update comments

Co-authored-by: Federico Kunze Küllmer <31522760+fedekunze@users.noreply.github.com>

proto/ethermint/evm/v1/evm.proto

@@ -24,6 +24,8 @@ message Params {
     (gogoproto.moretags) = "yaml:\"chain_config\"",
     (gogoproto.nullable) = false
   ];
+  // reject replay-unprotected transactions
+  bool reject_unprotected_tx = 6;
 }
 
 // ChainConfig defines the Ethereum ChainConfig parameters using *sdk.Int values

proto/ethermint/evm/v1/tx.proto

@@ -36,6 +36,7 @@ message MsgEthereumTx {
 }
 
 // LegacyTx is the transaction data of regular Ethereum transactions.
+// NOTE: All non-protected transactions (i.e non EIP155 signed) will fail if the RejectUnprotectedTx parameter is enabled. 
 message LegacyTx {
   option (gogoproto.goproto_getters) = false;
   option (cosmos_proto.implements_interface) = "TxData";