Add deployed bytecode retrieval mitigation

op-bindings/Makefile

@@ -7,6 +7,8 @@ contracts-list := ./artifacts.json
 log-level := info
 ETHERSCAN_APIKEY_ETH ?=
 ETHERSCAN_APIKEY_OP ?=
+RPC_URL_ETH ?=
+RPC_URL_OP ?=
 
 all: version mkdir bindings
 
@@ -36,7 +38,9 @@ bindgen-generate-all:
 		--source-maps-list MIPS,PreimageOracle \
 		--forge-artifacts $(contracts-dir)/forge-artifacts \
 		--etherscan.apikey.eth $(ETHERSCAN_APIKEY_ETH) \
-		--etherscan.apikey.op $(ETHERSCAN_APIKEY_OP)
+		--etherscan.apikey.op $(ETHERSCAN_APIKEY_OP) \
+		--rpc.url.eth $(RPC_URL_ETH) \
+		--rpc.url.op $(RPC_URL_OP)
 
 bindgen-local: compile bindgen-generate-local
 
@@ -60,7 +64,9 @@ bindgen-remote:
 		--log.level $(log-level) \
 		remote \
 		--etherscan.apikey.eth $(ETHERSCAN_APIKEY_ETH) \
-		--etherscan.apikey.op $(ETHERSCAN_APIKEY_OP)
+		--etherscan.apikey.op $(ETHERSCAN_APIKEY_OP) \
+		--rpc.url.eth $(RPC_URL_ETH) \
+		--rpc.url.op $(RPC_URL_OP)
 
 mkdir:
 	mkdir -p $(pkg)

op-bindings/bindgen/generator_remote.go

@@ -5,11 +5,13 @@ import (
 	"os"
 
 	"github.com/ethereum-optimism/optimism/op-bindings/etherscan"
+	"github.com/ethereum/go-ethereum/ethclient"
 )
 
 type bindGenGeneratorRemote struct {
 	bindGenGeneratorBase
 	contractDataClients map[string]contractDataClient
+	rpcClients          map[string]*ethclient.Client
 	tempArtifactsDir    string
 }
 

op-bindings/bindgen/main.go

@@ -7,6 +7,7 @@ import (
 	"github.com/ethereum-optimism/optimism/op-bindings/etherscan"
 	"github.com/ethereum-optimism/optimism/op-e2e/config"
 	oplog "github.com/ethereum-optimism/optimism/op-service/log"
+	"github.com/ethereum/go-ethereum/ethclient"
 	"github.com/ethereum/go-ethereum/log"
 	"github.com/urfave/cli/v2"
 )
@@ -171,6 +172,14 @@ func parseConfigRemote(logger log.Logger, c *cli.Context) (bindGenGeneratorRemot
 	generator.contractDataClients = make(map[string]contractDataClient)
 	generator.contractDataClients["eth"] = etherscan.NewEthereumClient(c.String(EtherscanApiKeyEthFlagName))
 	generator.contractDataClients["op"] = etherscan.NewOptimismClient(c.String(EtherscanApiKeyOpFlagName))
+
+	generator.rpcClients = make(map[string]*ethclient.Client)
+	if generator.rpcClients["eth"], err = ethclient.Dial(c.String(RpcUrlEthFlagName)); err != nil {
+		return bindGenGeneratorRemote{}, fmt.Errorf("error initializing Ethereum client: %w", err)
+	}
+	if generator.rpcClients["op"], err = ethclient.Dial(c.String(RpcUrlOpFlagName)); err != nil {
+		return bindGenGeneratorRemote{}, fmt.Errorf("error initializing Optimism client: %w", err)
+	}
 	return generator, nil
 }
 
@@ -222,5 +231,15 @@ func remoteFlags() []cli.Flag {
 			Usage:    "API key to make queries to Etherscan for Optimism",
 			Required: true,
 		},
+		&cli.StringFlag{
+			Name:     RpcUrlEthFlagName,
+			Usage:    "RPC URL (with API key if required) to query Ethereum",
+			Required: true,
+		},
+		&cli.StringFlag{
+			Name:     RpcUrlOpFlagName,
+			Usage:    "RPC URL (with API key if required) to query Optimism",
+			Required: true,
+		},
 	}
 }

op-bindings/bindgen/remote_handlers.go

@@ -1,6 +1,7 @@
 package main
 
 import (
+	"context"
 	"fmt"
 	"os"
 	"path/filepath"
@@ -9,6 +10,7 @@ import (
 	"text/template"
 
 	"github.com/ethereum-optimism/optimism/op-bindings/etherscan"
+	"github.com/ethereum/go-ethereum/common"
 )
 
 type contractData struct {
@@ -24,6 +26,12 @@ func (generator *bindGenGeneratorRemote) standardHandler(contractMetadata *remot
 	}
 
 	contractMetadata.DeployedBin = fetchedData.deployedBin
+	if err = generator.compareDeployedBytecodeWithRpc(contractMetadata, "eth"); err != nil {
+		return err
+	}
+	if err = generator.compareDeployedBytecodeWithRpc(contractMetadata, "op"); err != nil {
+		return err
+	}
 
 	// If ABI was explicitly provided by config, don't overwrite
 	if contractMetadata.Abi == "" {
@@ -61,6 +69,12 @@ func (generator *bindGenGeneratorRemote) multiSendHandler(contractMetadata *remo
 
 	contractMetadata.Abi = fetchedData.abi
 	contractMetadata.DeployedBin = fetchedData.deployedBin
+	if err = generator.compareDeployedBytecodeWithRpc(contractMetadata, "eth"); err != nil {
+		return err
+	}
+	if err = generator.compareDeployedBytecodeWithRpc(contractMetadata, "op"); err != nil {
+		return err
+	}
 	if contractMetadata.InitBin, err = generator.removeDeploymentSalt(fetchedData.deploymentTx.Input, contractMetadata.DeploymentSalt); err != nil {
 		return err
 	}
@@ -74,6 +88,12 @@ func (generator *bindGenGeneratorRemote) senderCreatorHandler(contractMetadata *
 	if err != nil {
 		return fmt.Errorf("error fetching deployed bytecode: %w", err)
 	}
+	if err = generator.compareDeployedBytecodeWithRpc(contractMetadata, "eth"); err != nil {
+		return err
+	}
+	if err = generator.compareDeployedBytecodeWithRpc(contractMetadata, "op"); err != nil {
+		return err
+	}
 
 	if err := generator.compareBytecodeWithOp(contractMetadata, false, true); err != nil {
 		return fmt.Errorf("error comparing contract bytecode for %s: %w", contractMetadata.Name, err)
@@ -195,6 +215,36 @@ func (generator *bindGenGeneratorRemote) compareBytecodeWithOp(contractMetadataE
 	return nil
 }
 
+func (generator *bindGenGeneratorRemote) compareDeployedBytecodeWithRpc(contractMetadata *remoteContractMetadata, chain string) error {
+	client, ok := generator.rpcClients[chain]
+	if !ok {
+		generator.logger.Crit("unknown chain, unable to retrieve a RPC client", "chain", chain)
+	}
+
+	if contractMetadata.Deployments[chain] != "" {
+		bytecode, err := client.CodeAt(context.Background(), common.HexToAddress(contractMetadata.Deployments[chain]), nil)
+		if err != nil {
+			generator.logger.Crit(
+				"Error getting deployed bytecode from RPC",
+				"chain", chain,
+				"err", err,
+			)
+		}
+		bytecodeHex := common.Bytes2Hex(bytecode)
+		if !strings.EqualFold(strings.TrimPrefix(contractMetadata.DeployedBin, "0x"), bytecodeHex) {
+			generator.logger.Crit(
+				"Deployment bytecode from RPC doesn't match bytecode from Etherscan",
+				"rpcBytecode", bytecodeHex,
+				"etherscanBytecode", contractMetadata.DeployedBin,
+			)
+		}
+	} else {
+		generator.logger.Warn("Unable to compare bytecode from Etherscan against RPC client, no deployment address provided for chain", "chain", chain)
+	}
+
+	return nil
+}
+
 func (generator *bindGenGeneratorRemote) writeAllOutputs(contractMetadata *remoteContractMetadata, fileTemplate string) error {
 	abiFilePath, bytecodeFilePath, err := writeContractArtifacts(
 		generator.logger, generator.tempArtifactsDir, contractMetadata.Name,