plugeth/tests/fuzzers/abi/abifuzzer.go

187 lines
5.9 KiB
Go
Raw Normal View History

// Copyright 2020 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 abi
import (
"bytes"
"fmt"
"math/rand"
"reflect"
"strings"
"github.com/ethereum/go-ethereum/accounts/abi"
"github.com/ethereum/go-ethereum/crypto"
fuzz "github.com/google/gofuzz"
)
func unpackPack(abi abi.ABI, method string, inputType []interface{}, input []byte) bool {
outptr := reflect.New(reflect.TypeOf(inputType))
if err := abi.UnpackIntoInterface(outptr.Interface(), method, input); err == nil {
output, err := abi.Pack(method, input)
if err != nil {
// We have some false positives as we can unpack these type successfully, but not pack them
if err.Error() == "abi: cannot use []uint8 as type [0]int8 as argument" ||
err.Error() == "abi: cannot use uint8 as type int8 as argument" {
return false
}
panic(err)
}
if !bytes.Equal(input, output[4:]) {
panic(fmt.Sprintf("unpackPack is not equal, \ninput : %x\noutput: %x", input, output[4:]))
}
return true
}
return false
}
func packUnpack(abi abi.ABI, method string, input []interface{}) bool {
if packed, err := abi.Pack(method, input); err == nil {
outptr := reflect.New(reflect.TypeOf(input))
err := abi.UnpackIntoInterface(outptr.Interface(), method, packed)
if err != nil {
panic(err)
}
out := outptr.Elem().Interface()
if !reflect.DeepEqual(input, out) {
panic(fmt.Sprintf("unpackPack is not equal, \ninput : %x\noutput: %x", input, out))
}
return true
}
return false
}
type args struct {
name string
typ string
}
func createABI(name string, stateMutability, payable *string, inputs []args) (abi.ABI, error) {
sig := fmt.Sprintf(`[{ "type" : "function", "name" : "%v" `, name)
if stateMutability != nil {
sig += fmt.Sprintf(`, "stateMutability": "%v" `, *stateMutability)
}
if payable != nil {
sig += fmt.Sprintf(`, "payable": %v `, *payable)
}
if len(inputs) > 0 {
sig += `, "inputs" : [ {`
for i, inp := range inputs {
sig += fmt.Sprintf(`"name" : "%v", "type" : "%v" `, inp.name, inp.typ)
if i+1 < len(inputs) {
sig += ","
}
}
sig += "} ]"
sig += `, "outputs" : [ {`
for i, inp := range inputs {
sig += fmt.Sprintf(`"name" : "%v", "type" : "%v" `, inp.name, inp.typ)
if i+1 < len(inputs) {
sig += ","
}
}
sig += "} ]"
}
sig += `}]`
return abi.JSON(strings.NewReader(sig))
}
func fillStruct(structs []interface{}, data []byte) {
if structs != nil && len(data) != 0 {
fuzz.NewFromGoFuzz(data).Fuzz(&structs)
}
}
func createStructs(args []args) []interface{} {
structs := make([]interface{}, len(args))
for i, arg := range args {
t, err := abi.NewType(arg.typ, "", nil)
if err != nil {
panic(err)
}
structs[i] = reflect.New(t.GetType()).Elem()
}
return structs
}
func runFuzzer(input []byte) int {
good := false
names := []string{"_name", "name", "NAME", "name_", "__", "_name_", "n"}
stateMut := []string{"", "pure", "view", "payable"}
stateMutabilites := []*string{nil, &stateMut[0], &stateMut[1], &stateMut[2], &stateMut[3]}
pays := []string{"true", "false"}
payables := []*string{nil, &pays[0], &pays[1]}
varNames := []string{"a", "b", "c", "d", "e", "f", "g"}
varNames = append(varNames, names...)
varTypes := []string{"bool", "address", "bytes", "string",
"uint8", "int8", "uint8", "int8", "uint16", "int16",
"uint24", "int24", "uint32", "int32", "uint40", "int40", "uint48", "int48", "uint56", "int56",
"uint64", "int64", "uint72", "int72", "uint80", "int80", "uint88", "int88", "uint96", "int96",
"uint104", "int104", "uint112", "int112", "uint120", "int120", "uint128", "int128", "uint136", "int136",
"uint144", "int144", "uint152", "int152", "uint160", "int160", "uint168", "int168", "uint176", "int176",
"uint184", "int184", "uint192", "int192", "uint200", "int200", "uint208", "int208", "uint216", "int216",
"uint224", "int224", "uint232", "int232", "uint240", "int240", "uint248", "int248", "uint256", "int256",
"bytes1", "bytes2", "bytes3", "bytes4", "bytes5", "bytes6", "bytes7", "bytes8", "bytes9", "bytes10", "bytes11",
"bytes12", "bytes13", "bytes14", "bytes15", "bytes16", "bytes17", "bytes18", "bytes19", "bytes20", "bytes21",
"bytes22", "bytes23", "bytes24", "bytes25", "bytes26", "bytes27", "bytes28", "bytes29", "bytes30", "bytes31",
"bytes32", "bytes"}
rnd := rand.New(rand.NewSource(123456))
if len(input) > 0 {
kec := crypto.Keccak256(input)
rnd = rand.New(rand.NewSource(int64(kec[0])))
}
name := names[rnd.Intn(len(names))]
stateM := stateMutabilites[rnd.Intn(len(stateMutabilites))]
payable := payables[rnd.Intn(len(payables))]
maxLen := 5
for k := 1; k < maxLen; k++ {
var arg []args
for i := k; i > 0; i-- {
argName := varNames[i]
argTyp := varTypes[rnd.Int31n(int32(len(varTypes)))]
if rnd.Int31n(10) == 0 {
argTyp += "[]"
} else if rnd.Int31n(10) == 0 {
arrayArgs := rnd.Int31n(30) + 1
argTyp += fmt.Sprintf("[%d]", arrayArgs)
}
arg = append(arg, args{
name: argName,
typ: argTyp,
})
}
abi, err := createABI(name, stateM, payable, arg)
if err != nil {
continue
}
structs := createStructs(arg)
b := unpackPack(abi, name, structs, input)
fillStruct(structs, input)
c := packUnpack(abi, name, structs)
good = good || b || c
}
if good {
return 1
}
return 0
}
func Fuzz(input []byte) int {
return runFuzzer(input)
}