wip: starting to add tests

cmd/clef/main.go

@@ -136,6 +136,11 @@ var (
 		Name:  "stdio-ui-test",
 		Usage: "Mechanism to test interface between Clef and UI. Requires 'stdio-ui'.",
 	}
+	validateSIWEFlag = &cli.BoolFlag{
+		Name:  "validate-siwe",
+		Usage: "Validate Sign-In with Etherium messages (ERC-4361)",
+		Value: true,
+	}
 	initCommand = &cli.Command{
 		Action:    initializeSecrets,
 		Name:      "init",
@@ -283,6 +288,7 @@ func init() {
 		ruleFlag,
 		stdiouiFlag,
 		testFlag,
+		validateSIWEFlag,
 		advancedMode,
 		acceptFlag,
 	}
@@ -409,7 +415,7 @@ func initInternalApi(c *cli.Context) (*core.UIServerAPI, core.UIClientAPI, error
 		lightKdf                  = c.Bool(utils.LightKDFFlag.Name)
 	)
 	am := core.StartClefAccountManager(ksLoc, true, lightKdf, "")
-	api := core.NewSignerAPI(am, 0, true, ui, nil, false, pwStorage)
+	api := core.NewSignerAPI(am, 0, true, ui, nil, false, pwStorage, false)
 	internalApi := core.NewUIServerAPI(api)
 	return internalApi, ui, nil
 }
@@ -700,12 +706,13 @@ func signer(c *cli.Context) error {
 		advanced         = c.Bool(advancedMode.Name)
 		nousb            = c.Bool(utils.NoUSBFlag.Name)
 		scpath           = c.String(utils.SmartCardDaemonPathFlag.Name)
+		validateSIWEFlag = c.Bool(validateSIWEFlag.Name)
 	)
 	log.Info("Starting signer", "chainid", chainId, "keystore", ksLoc,
 		"light-kdf", lightKdf, "advanced", advanced)
 	am := core.StartClefAccountManager(ksLoc, nousb, lightKdf, scpath)
 	defer am.Close()
-	apiImpl := core.NewSignerAPI(am, chainId, nousb, ui, db, advanced, pwStorage)
+	apiImpl := core.NewSignerAPI(am, chainId, nousb, ui, db, advanced, pwStorage, validateSIWEFlag)
 
 	// Establish the bidirectional communication, by creating a new UI backend and registering
 	// it with the UI.

signer/core/api.go

@@ -118,6 +118,7 @@ type SignerAPI struct {
 	UI          UIClientAPI
 	validator   Validator
 	rejectMode  bool
+	validateSIWEMode bool
 	credentials storage.Storage
 }
 
@@ -281,11 +282,11 @@ var ErrRequestDenied = errors.New("request denied")
 // key that is generated when a new Account is created.
 // noUSB disables USB support that is required to support hardware devices such as
 // ledger and trezor.
-func NewSignerAPI(am *accounts.Manager, chainID int64, noUSB bool, ui UIClientAPI, validator Validator, advancedMode bool, credentials storage.Storage) *SignerAPI {
+func NewSignerAPI(am *accounts.Manager, chainID int64, noUSB bool, ui UIClientAPI, validator Validator, advancedMode bool, credentials storage.Storage, validateSIWEMode bool) *SignerAPI {
 	if advancedMode {
 		log.Info("Clef is in advanced mode: will warn instead of reject")
 	}
-	signer := &SignerAPI{big.NewInt(chainID), am, ui, validator, !advancedMode, credentials}
+	signer := &SignerAPI{big.NewInt(chainID), am, ui, validator, !advancedMode, validateSIWEMode, credentials}
 	if !noUSB {
 		signer.startUSBListener()
 	}

signer/core/api_test.go

@@ -115,16 +115,17 @@ func tmpDirName(t *testing.T) string {
 	return d
 }
 
-func setup(t *testing.T) (*core.SignerAPI, *headlessUi) {
+func setup(t *testing.T, enableSIWE bool) (*core.SignerAPI, *headlessUi) {
 	db, err := fourbyte.New()
 	if err != nil {
 		t.Fatal(err.Error())
 	}
 	ui := &headlessUi{make(chan string, 20), make(chan string, 20)}
 	am := core.StartClefAccountManager(tmpDirName(t), true, true, "")
-	api := core.NewSignerAPI(am, 1337, true, ui, db, true, &storage.NoStorage{})
+	api := core.NewSignerAPI(am, 1337, true, ui, db, true, &storage.NoStorage{}, enableSIWE)
 	return api, ui
 }
+
 func createAccount(ui *headlessUi, api *core.SignerAPI, t *testing.T) {
 	ui.approveCh <- "Y"
 	ui.inputCh <- "a_long_password"
@@ -170,7 +171,7 @@ func list(ui *headlessUi, api *core.SignerAPI, t *testing.T) ([]common.Address,
 
 func TestNewAcc(t *testing.T) {
 	t.Parallel()
-	api, control := setup(t)
+	api, control := setup(t, false)
 	verifyNum := func(num int) {
 		list, err := list(control, api, t)
 		if err != nil {
@@ -243,7 +244,7 @@ func TestSignTx(t *testing.T) {
 		err       error
 	)
 
-	api, control := setup(t)
+	api, control := setup(t, false)
 	createAccount(control, api, t)
 	control.approveCh <- "A"
 	list, err = api.List(context.Background())

signer/core/signed_data.go

@@ -38,6 +38,17 @@ import (
 // Note, the produced signature conforms to the secp256k1 curve R, S and V values,
 // where the V value will be 27 or 28 for legacy reasons, if legacyV==true.
 func (api *SignerAPI) sign(req *SignDataRequest, legacyV bool) (hexutil.Bytes, error) {
+	if api.validateSIWEMode {
+		// perform SIWE validation
+		err := validateSIWE(req)
+		if err != nil {
+			if errors.Is(err, ErrMalformedSIWEMEssage) {
+				api.UI.ShowInfo(err.Error())
+			} else {
+				return nil, err
+			}
+		}
+	}
 	// We make the request prior to looking up if we actually have the account, to prevent
 	// account-enumeration via the API
 	res, err := api.UI.ApproveSignData(req)

signer/core/signed_data_test.go

@@ -34,6 +34,7 @@ import (
 	"github.com/ethereum/go-ethereum/crypto"
 	"github.com/ethereum/go-ethereum/signer/core"
 	"github.com/ethereum/go-ethereum/signer/core/apitypes"
+	"github.com/stretchr/testify/require"
 )
 
 var typesStandard = apitypes.Types{
@@ -184,7 +185,7 @@ var typedData = apitypes.TypedData{
 
 func TestSignData(t *testing.T) {
 	t.Parallel()
-	api, control := setup(t)
+	api, control := setup(t, false)
 	//Create two accounts
 	createAccount(control, api, t)
 	createAccount(control, api, t)
@@ -1060,3 +1061,48 @@ func TestEncodeDataRecursiveBytes(t *testing.T) {
 		t.Fatalf("got err %v", err)
 	}
 }
+
+func TestSignInWithEtherium(t *testing.T) {
+	t.Parallel()
+
+	testFiles, err := os.ReadDir(filepath.Join("testdata", "siwe"))
+	require.NoError(t, err)
+
+	for _, fInfo := range testFiles {
+		if !strings.HasSuffix(fInfo.Name(), "txt") {
+			continue
+		}
+		t.Run(fInfo.Name(), func(t *testing.T) {
+			t.Parallel()
+			expectedFailure := strings.HasPrefix(fInfo.Name(), "expfail")
+			expectedWarning := strings.HasPrefix(fInfo.Name(), "expwarn")
+			message, err := os.ReadFile(filepath.Join("testdata", "siwe", fInfo.Name()))
+			require.NoError(t, err)
+
+			api, control := setup(t, true)
+			createAccount(control, api, t)
+			createAccount(control, api, t)
+			control.approveCh <- "1"
+			list, err := api.List(context.Background())
+			require.NoError(t, err)
+			a := common.NewMixedcaseAddress(list[0])
+
+			control.approveCh <- "Y"
+			control.inputCh <- "a_long_password"
+			signature, err := api.SignData(context.Background(), apitypes.TextPlain.Mime, a, hexutil.Encode([]byte(message)))
+
+			if expectedFailure {
+				require.Error(t, err)
+				return
+			} else {
+				require.NoError(t, err)
+			}
+			if expectedWarning {
+				// todo: monitor for warning
+			}
+			if signature == nil || len(signature) != 65 {
+				t.Errorf("Expected 65 byte signature (got %d bytes)", len(signature))
+			}
+		})
+	}
+}

signer/core/siwevalidation.go

@@ -0,0 +1,107 @@
+// Copyright 2025 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+package core
+
+import (
+	"errors"
+	"fmt"
+	"regexp"
+	"strings"
+)
+
+// Regular expression to match SIWE messages
+// Scheme (optional)
+var scheme = `(?:[a-zA-Z][a-zA-Z0-9+\-.]*://)?`
+
+// Domain
+var domain = `(?:[^ ]+)`
+
+// Static message
+var wantsMsg = ` wants you to sign in with your Ethereum account:\n`
+
+// Ethereum address (with basic 0x prefix + 40 hex digits)
+var address = `0x[a-fA-F0-9]{40}\n`
+
+// Optional statement (any line not containing "\n\n")
+var statement = `(?:[^\n]+\n)?`
+
+// URI
+var uri = `URI: (.+)\n`
+
+// Version
+var version = `Version: 1\n`
+
+// Chain ID
+var chainID = `Chain ID: (\d+)\n`
+
+// Nonce (min 8 alphanumeric characters)
+var nonce = `Nonce: [a-zA-Z0-9]{8,}\n`
+
+// Issued At (RFC 3339 date-time)
+var issuedAt = `Issued At: ([0-9T:\-+.Z]+)`
+
+// Optional Expiration Time
+var expiration = `(?:\nExpiration Time: ([0-9T:\-+.Z]+))?`
+
+// Optional Not Before
+var notBefore = `(?:\nNot Before: ([0-9T:\-+.Z]+))?`
+
+// Optional Request ID
+var requestID = `(?:\nRequest ID: ([^\n]+))?`
+
+// Optional Resources
+var resources = `(?:\nResources:(?:\n- .+)+)?`
+
+// SIWE Message Regex
+var siweMessageRegex = regexp.MustCompile(`(?m)^` + scheme + domain + wantsMsg +
+	address + `\n` + statement + `\n` +
+	uri + version + chainID + nonce + issuedAt +
+	expiration + notBefore + requestID + resources + `$`)
+
+var ErrMalformedSIWEMEssage = errors.New("the message is asking to sign in with Ethereum but does not conform to EIP-4361")
+
+func validateSIWE(req *SignDataRequest) error {
+	for _, message := range req.Messages {
+		s, ok := message.Value.(string)
+		if !ok {
+			continue
+		}
+		if !strings.Contains(s, "wants you to sign in with your Ethereum account") {
+			continue
+		}
+		patterns := siweMessageRegex.FindStringSubmatch(s)
+		if len(patterns) != 14 {
+			return ErrMalformedSIWEMEssage
+		}
+		scheme := "https"
+		if patterns[0] != "" {
+			scheme = patterns[0]
+		}
+		if err := validateDomain(req, scheme, patterns[1]); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func validateDomain(request *SignDataRequest, scheme, domain string) error {
+	siweOrigin := fmt.Sprintf("%s://%s", scheme, domain)
+	if siweOrigin != request.Meta.Origin {
+		return fmt.Errorf("sign in request domain (%s) does not match source: %s", siweOrigin, request.Meta.Origin)
+	}
+	return nil
+}

signer/core/testdata/siwe/eip1271.txt

@@ -0,0 +1 @@
+localhost:4361 wants you to sign in with your Ethereum account:\n0xa5b3A53800cD49669F34DE80f2C569c6D4Ca3009\n\nSIWE Notepad Example\n\nURI: http://localhost:4361\nVersion: 1\nChain ID: 1\nNonce: FbYd6TNB4m0IUHDG7\nIssued At: 2022-04-19T18:55:04.444Z

signer/core/testdata/siwe/eip1271_2.txt

@@ -0,0 +1 @@
+localhost:4361 wants you to sign in with your Ethereum account:\n0x0e565A6dFc43DE21455a67bbF196f7F7b15447A7\n\nSIWE Notepad Example\n\nURI: http://localhost:4361\nVersion: 1\nChain ID: 1\nNonce: b19JyMHnM0Jdm20as\nIssued At: 2022-04-19T18:57:09.490Z

signer/core/testdata/siwe/expwarn_malformed_1.txt

@@ -0,0 +1 @@
+wants you to sign in with your Ethereum account

signer/core/testdata/siwe/no_optional_fields.txt.

@@ -0,0 +1 @@
+service.org wants you to sign in with your Ethereum account:\n0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2\n\nI accept the ServiceOrg Terms of Service: https://service.org/tos\n\nURI: https://service.org/login\nVersion: 1\nChain ID: 1\nNonce: 32891757\nIssued At: 2021-09-30T16:25:24.000Z

signer/core/testdata/siwe/with_optional_fields.txt

@@ -0,0 +1 @@
+service.org wants you to sign in with your Ethereum account:\n0xC02aaA39b223FE8D0A0e5C4F27eAD9083C756Cc2\n\nI accept the ServiceOrg Terms of Service: https://service.org/tos\n\nURI: https://service.org/login\nVersion: 1\nChain ID: 1\nNonce: 32891757\nIssued At: 2021-09-30T16:25:24.000Z\nResources:\n- ipfs://Qme7ss3ARVgxv6rXqVPiikMJ8u2NLgmgszg13pYrDKEoiu\n- https://example.com/my-web2-claim.json