plugeth/crypto/signify/signify_fuzz.go
2022-05-16 11:59:35 +02:00

151 lines
3.8 KiB
Go

// 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/>.
//go:build gofuzz
// +build gofuzz
package signify
import (
"bufio"
"fmt"
"log"
"os"
"os/exec"
fuzz "github.com/google/gofuzz"
"github.com/jedisct1/go-minisign"
)
func Fuzz(data []byte) int {
if len(data) < 32 {
return -1
}
tmpFile, err := os.CreateTemp("", "")
if err != nil {
panic(err)
}
defer os.Remove(tmpFile.Name())
defer tmpFile.Close()
testSecKey, testPubKey := createKeyPair()
// Create message
tmpFile.Write(data)
if err = tmpFile.Close(); err != nil {
panic(err)
}
// Fuzz comments
var untrustedComment string
var trustedComment string
f := fuzz.NewFromGoFuzz(data)
f.Fuzz(&untrustedComment)
f.Fuzz(&trustedComment)
fmt.Printf("untrusted: %v\n", untrustedComment)
fmt.Printf("trusted: %v\n", trustedComment)
err = SignifySignFile(tmpFile.Name(), tmpFile.Name()+".sig", testSecKey, untrustedComment, trustedComment)
if err != nil {
panic(err)
}
defer os.Remove(tmpFile.Name() + ".sig")
signify := "signify"
path := os.Getenv("SIGNIFY")
if path != "" {
signify = path
}
_, err := exec.LookPath(signify)
if err != nil {
panic(err)
}
// Write the public key into the file to pass it as
// an argument to signify-openbsd
pubKeyFile, err := os.CreateTemp("", "")
if err != nil {
panic(err)
}
defer os.Remove(pubKeyFile.Name())
defer pubKeyFile.Close()
pubKeyFile.WriteString("untrusted comment: signify public key\n")
pubKeyFile.WriteString(testPubKey)
pubKeyFile.WriteString("\n")
cmd := exec.Command(signify, "-V", "-p", pubKeyFile.Name(), "-x", tmpFile.Name()+".sig", "-m", tmpFile.Name())
if output, err := cmd.CombinedOutput(); err != nil {
panic(fmt.Sprintf("could not verify the file: %v, output: \n%s", err, output))
}
// Verify the signature using a golang library
sig, err := minisign.NewSignatureFromFile(tmpFile.Name() + ".sig")
if err != nil {
panic(err)
}
pKey, err := minisign.NewPublicKey(testPubKey)
if err != nil {
panic(err)
}
valid, err := pKey.VerifyFromFile(tmpFile.Name(), sig)
if err != nil {
panic(err)
}
if !valid {
panic("invalid signature")
}
return 1
}
func getKey(fileS string) (string, error) {
file, err := os.Open(fileS)
if err != nil {
log.Fatal(err)
}
defer file.Close()
scanner := bufio.NewScanner(file)
// Discard the first line
scanner.Scan()
scanner.Scan()
return scanner.Text(), scanner.Err()
}
func createKeyPair() (string, string) {
// Create key and put it in correct format
tmpKey, err := os.CreateTemp("", "")
if err != nil {
panic(err)
}
defer os.Remove(tmpKey.Name())
defer os.Remove(tmpKey.Name() + ".pub")
defer os.Remove(tmpKey.Name() + ".sec")
cmd := exec.Command("signify", "-G", "-n", "-p", tmpKey.Name()+".pub", "-s", tmpKey.Name()+".sec")
if output, err := cmd.CombinedOutput(); err != nil {
panic(fmt.Sprintf("could not verify the file: %v, output: \n%s", err, output))
}
secKey, err := getKey(tmpKey.Name() + ".sec")
if err != nil {
panic(err)
}
pubKey, err := getKey(tmpKey.Name() + ".pub")
if err != nil {
panic(err)
}
return secKey, pubKey
}