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signer: implement validation rules, change signature of call_info

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This commit is contained in:
Martin Holst Swende 2018-02-16 12:45:51 +01:00
parent f2538c30bc
commit be24e89a8f
No known key found for this signature in database
GPG key ID: 683B438C05A5DDF0
9 changed files with 470 additions and 94 deletions
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130
cmd/signer/README.md
View file

@ -506,29 +506,137 @@ Invoked when there's a transaction for approval.
#### Sample call
Here's a method invocation:
```bash
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000000000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
```
```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "ApproveTx",
"params": [{
"params": [
{
"transaction": {
"to": "0xae967917c465db8578ca9024c205720b1a3651A9",
"from": "0x0x694267f14675d7e1b9494fd8d72fefe1755710fa",
"to": "0x0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"gas": "0x333",
"gasPrice": "0x123",
"value": "0x10",
"data": "0xd7a5865800000000000000000000000000000000000000000000000000000000000000ff",
"nonce": "0x0"
"gasPrice": "0x1",
"value": "0x0",
"nonce": "0x0",
"data": "0x4401a6e40000000000000000000000000000000000000000000000000000000000000012",
"input": null
},
"call_info": {
"Messages": [
{
"type": "WARNING",
"message": "Invalid checksum on to-address"
},
{
"type": "Info",
"message": "safeSend(address: 0x0000000000000000000000000000000000000012)"
}
]
},
"fromaccount": "0xAe967917c465db8578ca9024c205720b1a3651A9",
"call_info": "Warning! Could not validate ABI-data against calldata\nSupplied ABI spec does not contain method signature in data: 0xd7a58658",
"meta": {
"remote": "127.0.0.1:34572",
"remote": "127.0.0.1:48486",
"local": "localhost:8550",
"scheme": "HTTP/1.1"
}
}],
"id": 1
}
]
}
```
The same method invocation, but with invalid data:
```bash
curl -i -H "Content-Type: application/json" -X POST --data '{"jsonrpc":"2.0","method":"account_signTransaction","params":[{"from":"0x694267f14675d7e1b9494fd8d72fefe1755710fa","gas":"0x333","gasPrice":"0x1","nonce":"0x0","to":"0x07a565b7ed7d7a678680a4c162885bedbb695fe0", "value":"0x0", "data":"0x4401a6e40000000000000002000000000000000000000000000000000000000000000012"},"safeSend(address)"],"id":67}' http://localhost:8550/
```
```json
{
"jsonrpc": "2.0",
"id": 1,
"method": "ApproveTx",
"params": [
{
"transaction": {
"from": "0x0x694267f14675d7e1b9494fd8d72fefe1755710fa",
"to": "0x0x07a565b7ed7d7a678680a4c162885bedbb695fe0",
"gas": "0x333",
"gasPrice": "0x1",
"value": "0x0",
"nonce": "0x0",
"data": "0x4401a6e40000000000000002000000000000000000000000000000000000000000000012",
"input": null
},
"call_info": {
"Messages": [
{
"type": "WARNING",
"message": "Invalid checksum on to-address"
},
{
"type": "WARNING",
"message": "Transaction data did not match ABI-interface: WARNING: Supplied data is stuffed with extra data. \nWant 0000000000000002000000000000000000000000000000000000000000000012\nHave 0000000000000000000000000000000000000000000000000000000000000012\nfor method safeSend(address)"
}
]
},
"meta": {
"remote": "127.0.0.1:48492",
"local": "localhost:8550",
"scheme": "HTTP/1.1"
}
}
]
}
```
One which has missing `to`, but with no `data`:
```json
{
"jsonrpc": "2.0",
"id": 3,
"method": "ApproveTx",
"params": [
{
"transaction": {
"from": "",
"to": null,
"gas": "0x0",
"gasPrice": "0x0",
"value": "0x0",
"nonce": "0x0",
"data": null,
"input": null
},
"call_info": {
"Messages": [
{
"type": "CRITICAL",
"message": "Tx will create contract with empty code!"
}
]
},
"meta": {
"remote": "signer binary",
"local": "main",
"scheme": "in-proc"
}
}
]
}
```

5
cmd/signer/core/abihelper.go
View file

@ -161,6 +161,11 @@ type AbiDb struct {
db map[string]string
}
// NewEmptyAbiDB exists for test purposes
func NewEmptyAbiDB() (*AbiDb, error) {
return &AbiDb{make(map[string]string)}, nil
}
// NewAbiDBFromFile loads signature database from file, and
// errors if the file is not valid json. Does no other validation of contents
func NewAbiDBFromFile(path string) (*AbiDb, error) {

62
cmd/signer/core/api.go
View file

@ -23,9 +23,6 @@ import (
"fmt"
"io/ioutil"
"math/big"
"bytes"
"reflect"
"github.com/ethereum/go-ethereum/accounts"
@ -87,7 +84,7 @@ type SignerAPI struct {
chainID *big.Int
am *accounts.Manager
UI SignerUI
abidb AbiDb
validator *Validator
}
// Metadata about a request
@ -127,7 +124,7 @@ type (
// SignTxRequest contains info about a Transaction to sign
SignTxRequest struct {
Transaction SendTxArgs `json:"transaction"`
Callinfo string `json:"call_info"`
Callinfo *ValidationMessages `json:"call_info"`
Meta Metadata `json:"meta"`
}
// SignTxResponse result from SignTxRequest
@ -229,7 +226,7 @@ func NewSignerAPI(chainID int64, ksLocation string, noUSB bool, ui SignerUI, abi
log.Debug("Trezor support enabled")
}
}
return &SignerAPI{big.NewInt(chainID), accounts.NewManager(backends...), ui, *abidb}
return &SignerAPI{big.NewInt(chainID), accounts.NewManager(backends...), ui, NewValidator(abidb)}
}
// List returns the set of wallet this signer manages. Each wallet can contain
@ -318,66 +315,21 @@ func logDiff(original *SignTxRequest, new *SignTxResponse) bool {
return modified
}
// determineCallInfo turns ABI-data + methodselector (if given) into a string suitable
// to present to the user.
func (api *SignerAPI) determineCallInfo(data []byte, methodSelector *string) string {
if len(data) < 4 {
return ""
}
var (
selector string
err error
)
// Try to make sense of the data
if methodSelector == nil {
selector, err = api.abidb.LookupMethodSelector(data[:4])
if err != nil {
return errorWrapper{"Warning! Could not locate ABI", err}.String()
}
} else {
selector = *methodSelector
}
if selector != "" {
abiData, err := MethodSelectorToAbi(selector)
if err != nil {
return errorWrapper{"Warning! Could not validate ABI-data against calldata", err}.String()
} else {
var info *decodedCallData
info, err = parseCallData(data, string(abiData))
if err != nil {
return errorWrapper{"Warning! Could not validate ABI-data against calldata", err}.String()
} else {
return info.String()
}
}
}
return ""
}
// SignTransaction signs the given Transaction and returns it both as json and rlp-encoded form
func (api *SignerAPI) SignTransaction(ctx context.Context, args SendTxArgs, methodSelector *string) (*ethapi.SignTransactionResult, error) {
var (
err error
result SignTxResponse
data []byte
)
// Prevent accidental erroneous usage of both 'input' and 'data'
if args.Data != nil && args.Input != nil && !bytes.Equal(*args.Data, *args.Input) {
return nil, errors.New(`Ambiguous request: moth "data" and "input" are set and are not identical`)
msgs, err:= api.validator.ValidateTransaction(&args, methodSelector)
if err != nil {
return nil, err
}
if args.Data != nil {
data = *args.Data
} else if args.Input != nil {
data = *args.Input
*args.Data = data
*args.Input = nil
}
req := SignTxRequest{
Transaction: args,
Meta: MetadataFromContext(ctx),
Callinfo: api.determineCallInfo(data, methodSelector),
Callinfo: msgs,
}
// Process approval
result, err = api.UI.ApproveTx(&req)

11
cmd/signer/core/cliui.go
View file

@ -92,7 +92,7 @@ func (ui *CommandlineUI) confirm() bool {
}
func showMetadata(metadata Metadata) {
fmt.Printf("Request info:\n\t%v -> %v -> %v\n", metadata.Remote, metadata.Scheme, metadata.Local)
fmt.Printf("Request context:\n\t%v -> %v -> %v\n", metadata.Remote, metadata.Scheme, metadata.Local)
}
// ApproveTx prompt the user for confirmation to request to sign Transaction
@ -117,9 +117,12 @@ func (ui *CommandlineUI) ApproveTx(request *SignTxRequest) (SignTxResponse, erro
fmt.Printf("data: %v\n", common.Bytes2Hex(d))
}
}
if request.Callinfo != "" {
fmt.Printf("\nNote: This Transaction contains data. Review abi-decoding info below:")
fmt.Printf("\nCall info:\n\t%v\n", request.Callinfo)
if request.Callinfo != nil {
fmt.Printf("\nTransaction validation:\n")
for _,m := range request.Callinfo.Messages{
fmt.Printf(" * %s : %s", m.Typ, m.Message)
}
fmt.Println()
}
fmt.Printf("\n")

9
cmd/signer/core/stdioui.go
View file

@ -44,8 +44,13 @@ func NewStdIOUI() *StdIOUI {
}
// dispatch sends a request over the stdio
func (ui *StdIOUI) dispatch(serviceMethod string, args interface{}, reply interface{}) error {
err := ui.client.Call(&reply, serviceMethod, args)
func (ui *StdIOUI) dispatch(serviceMethod string, args interface{}, reply interface{}) error{
var err error
if reply != nil{
err = ui.client.Call(nil, serviceMethod, args)
}else{
err = ui.client.Call(&reply, serviceMethod, args)
}
if err != nil {
log.Info("Error", "exc", err.Error())
}

8
cmd/signer/core/types.go
View file

@ -50,6 +50,14 @@ func (a Account) String() string {
}
return err.Error()
}
type ValidationInfo struct {
Typ string `json:"type"`
Message string `json:"message"`
}
type ValidationMessages struct {
Messages []ValidationInfo
}
/*
// TransactionArg represents a Transaction for the signer.
type TransactionArg struct {

152
cmd/signer/core/validation.go Normal file
View file

@ -0,0 +1,152 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"bytes"
"errors"
"fmt"
"github.com/ethereum/go-ethereum/common"
"math/big"
)
// The validation package contains validation checks for transactions
// - ABI-data validation
// - Transaction semantics validation
// The package provides warnings for typical pitfalls
func (vs *ValidationMessages) crit(msg string) {
vs.Messages = append(vs.Messages, ValidationInfo{"CRITICAL", msg})
}
func (vs *ValidationMessages) warn(msg string) {
vs.Messages = append(vs.Messages, ValidationInfo{"WARNING", msg})
}
func (vs *ValidationMessages) info(msg string) {
vs.Messages = append(vs.Messages, ValidationInfo{"Info", msg})
}
type Validator struct {
db *AbiDb
}
func NewValidator(db *AbiDb) *Validator {
return &Validator{db}
}
// validateCallData checks if the ABI-data + methodselector (if given) can be parsed and seems to match
func (v *Validator) validateCallData(msgs *ValidationMessages, data []byte, methodSelector *string) {
if len(data) == 0 {
return
}
if len(data) < 4 {
msgs.warn("Tx contains data which is not valid ABI")
return
}
var (
selector string
err error
)
// Try to make sense of the data
if methodSelector != nil {
selector = *methodSelector
}
if selector == "" {
selector, err = v.db.LookupMethodSelector(data[:4])
if err != nil {
msgs.warn(fmt.Sprintf("Tx contains data, but the ABI signature could not be found: %v", err))
return
}
}
if selector == "" {
// No more to do that this stage
return
}
abiData, err := MethodSelectorToAbi(selector)
if err != nil {
msgs.warn(fmt.Sprintf("Transaction data did not match ABI-interface: %v", err))
return
}
info, err := parseCallData(data, string(abiData))
if err != nil {
msgs.warn(fmt.Sprintf("Transaction data did not match ABI-interface: %v", err))
} else {
msgs.info(info.String())
}
return
}
// validateSemantics checks if the transactions 'makes sense', and generate warnings for a couple of typical scenarios
func (v *Validator) validate(msgs *ValidationMessages, txargs *SendTxArgs, methodSelector *string) error {
// Prevent accidental erroneous usage of both 'input' and 'data'
if txargs.Data != nil && txargs.Input != nil && !bytes.Equal(*txargs.Data, *txargs.Input) {
// This is a showstopper
return errors.New(`Ambiguous request: moth "data" and "input" are set and are not identical`)
}
var (
data []byte
)
// Place data on 'data', and nil 'input'
if txargs.Input != nil {
txargs.Data = txargs.Input
txargs.Input = nil
}
if txargs.Data != nil {
data = *txargs.Data
}
if txargs.To == nil {
//Contract creation should contain sufficient data to deploy a contract
// A typical error is omitting sender due to some quirk in the javascript call
// e.g. https://github.com/ethereum/go-ethereum/issues/16106
if len(data) == 0 {
if txargs.Value.ToInt().Cmp(big.NewInt(0)) > 0 {
// Sending ether into black hole
return errors.New(`Tx will create contract with value but empty code!`)
}
// No value submitted at least
msgs.crit("Tx will create contract with empty code!")
} else if len(data) < 40 { //Arbitrary limit
msgs.warn(fmt.Sprintf("Tx will will create contract, but payload is suspiciously small (%d b)", len(data)))
}
// methodSelector should be nil for contract creation
if methodSelector != nil {
msgs.warn("Tx will create contract, but method selector supplied; indicating intent to call a method.")
}
} else {
if !txargs.To.ValidChecksum() {
msgs.warn("Invalid checksum on to-address")
}
// Normal transaction
if bytes.Equal(txargs.To.Address().Bytes(), common.Address{}.Bytes()) {
// Sending to 0
msgs.crit("Tx destination is the zero address!")
}
// Validate calldata
v.validateCallData(msgs, data, methodSelector);
}
return nil
}
// ValidateTransaction does a number of checks on the supplied transaction, and returns either a list of warnings,
// or an error, indicating that the transaction should be immediately rejected
func (v *Validator) ValidateTransaction(txArgs *SendTxArgs, methodSelector *string) (*ValidationMessages, error) {
msgs := &ValidationMessages{}
return msgs, v.validate(msgs, txArgs, methodSelector)
}

140
cmd/signer/core/validation_test.go Normal file
View file

@ -0,0 +1,140 @@
// Copyright 2018 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
package core
import (
"fmt"
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"math/big"
"testing"
)
func hexAddr(a string) common.Address { return common.BytesToAddress(common.FromHex(a)) }
func mixAddr(a string) (*common.MixedcaseAddress, error) {
return common.NewMixedcaseAddressFromString(a)
}
func toHexBig(h string) hexutil.Big {
b := big.NewInt(0).SetBytes(common.FromHex(h))
return hexutil.Big(*b)
}
func toHexUint(h string) hexutil.Uint64 {
b := big.NewInt(0).SetBytes(common.FromHex(h))
return hexutil.Uint64(b.Uint64())
}
func dummyTxArgs(t txtestcase) *SendTxArgs {
to, _ := mixAddr(t.to)
from, _ := mixAddr(t.from)
n := toHexUint(t.n)
gas := toHexBig(t.g)
gasPrice := toHexBig(t.gp)
value := toHexBig(t.value)
var(
data, input *hexutil.Bytes
)
if t.d != ""{
a := hexutil.Bytes(common.FromHex(t.d))
data = &a
}
if t.i != ""{
a := hexutil.Bytes(common.FromHex(t.i))
input = &a
}
return &SendTxArgs{
From: *from,
To: to,
Value: value,
Nonce: n,
GasPrice: gas,
Gas: gasPrice,
Data: data,
Input: input,
}
}
type txtestcase struct {
from, to, n, g, gp, value, d, i string
expectErr bool
numMessages int
}
func TestValidator(t *testing.T) {
var (
// use empty db, there are other tests for the abi-specific stuff
db, _ = NewEmptyAbiDB()
v = NewValidator(db)
)
testcases := []txtestcase{
// Invalid to checksum
{from: "000000000000000000000000000000000000dead", to: "000000000000000000000000000000000000dead",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", numMessages: 1},
// valid 0x000000000000000000000000000000000000dEaD
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", numMessages: 0},
// conflicting input and data
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", d: "0x01", i: "0x02", expectErr: true, },
// Data can't be parsed
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", d: "0x0102", numMessages:1 },
// Data (on Input) can't be parsed
{from: "000000000000000000000000000000000000dead", to: "0x000000000000000000000000000000000000dEaD",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", i: "0x0102", numMessages:1 },
// Send to 0
{from: "000000000000000000000000000000000000dead", to: "0x0000000000000000000000000000000000000000",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", numMessages: 1},
// Create empty contract (no value)
{from: "000000000000000000000000000000000000dead", to: "",
n: "0x01", g: "0x20", gp: "0x40", value: "0x00", numMessages: 1},
// Create empty contract (with value)
{from: "000000000000000000000000000000000000dead", to: "",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01", expectErr: true},
// Small payload for create
{from: "000000000000000000000000000000000000dead", to: "",
n: "0x01", g: "0x20", gp: "0x40", value: "0x01",d:"0x01", numMessages: 1},
}
for i, test := range testcases {
msgs, err := v.ValidateTransaction(dummyTxArgs(test), nil)
if err == nil && test.expectErr {
t.Errorf("Test %d, expected error", i)
for _, msg := range msgs.Messages {
fmt.Printf("* %s: %s\n", msg.Typ, msg.Message)
}
}
if err != nil && !test.expectErr {
t.Errorf("Test %d, unexpected error: %v", i, err)
}
if err == nil {
got := len(msgs.Messages)
if got != test.numMessages {
for _, msg := range msgs.Messages {
fmt.Printf("* %s: %s\n", msg.Typ, msg.Message)
}
t.Errorf("Test %d, expected %d messages, got %d", i,test.numMessages, got)
}else{
//Debug printout, remove later
for _, msg := range msgs.Messages {
fmt.Printf("* [%d] %s: %s\n", i, msg.Typ, msg.Message)
}
fmt.Println()
}
}
}
}

17
cmd/signer/rules/rules_test.go
View file

@ -9,8 +9,8 @@ import (
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/internal/ethapi"
"math/big"
"testing"
"strings"
"testing"
)
const JS = `
@ -167,7 +167,7 @@ func TestSignTxRequest(t *testing.T) {
Transaction: core.SendTxArgs{
From: *from,
To: to},
Callinfo: "",
Callinfo: nil,
Meta: core.Metadata{"remoteip", "localip", "inproc"},
})
if err != nil {
@ -251,7 +251,7 @@ func TestForwarding(t *testing.T) {
exp_calls := 8
if len(ui.calls) != exp_calls {
t.Errorf("Expected %d forwarded calls, got %d: %s", exp_calls, len(ui.calls), strings.Join(ui.calls,","))
t.Errorf("Expected %d forwarded calls, got %d: %s", exp_calls, len(ui.calls), strings.Join(ui.calls, ","))
}
@ -425,7 +425,11 @@ func dummyTx(value hexutil.Big) *core.SignTxRequest {
GasPrice: gas,
Gas: gasPrice,
},
Callinfo: "Warning, all your base are bellong to us",
Callinfo: &core.ValidationMessages{
[]core.ValidationInfo{
{"Warning", "All your base are bellong to us"},
},
},
Meta: core.Metadata{"remoteip", "localip", "inproc"},
}
}
@ -484,7 +488,7 @@ func TestLimitWindow(t *testing.T) {
}
// dontCallMe is used as a next-handler that does not want to be called - it invokes test failure
type dontCallMe struct{
type dontCallMe struct {
t *testing.T
}
@ -530,7 +534,6 @@ func (d *dontCallMe) OnApprovedTx(tx ethapi.SignTransactionResult) {
d.t.Fatalf("Did not expect next-handler to be called")
}
//TestContextIsCleared tests that the rule-engine does not retain variables over several requests.
// if it does, that would be bad since developers may rely on that to store data,
// instead of using the disk-based data storage
@ -561,7 +564,7 @@ func TestContextIsCleared(t *testing.T) {
tx := dummyTxWithV(0)
r1, err := r.ApproveTx(tx)
r2, err := r.ApproveTx(tx)
if r1.Approved != r2.Approved{
if r1.Approved != r2.Approved {
t.Errorf("Expected execution context to be cleared between executions")
}
}