151 lines
3.8 KiB
Go
151 lines
3.8 KiB
Go
// Copyright 2020 The go-ethereum Authors
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// This file is part of the go-ethereum library.
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//
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// The go-ethereum library is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// The go-ethereum library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
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//go:build gofuzz
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// +build gofuzz
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package signify
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import (
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"bufio"
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"fmt"
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"log"
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"os"
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"os/exec"
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fuzz "github.com/google/gofuzz"
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"github.com/jedisct1/go-minisign"
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)
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func Fuzz(data []byte) int {
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if len(data) < 32 {
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return -1
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}
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tmpFile, err := os.CreateTemp("", "")
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if err != nil {
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panic(err)
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}
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defer os.Remove(tmpFile.Name())
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defer tmpFile.Close()
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testSecKey, testPubKey := createKeyPair()
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// Create message
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tmpFile.Write(data)
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if err = tmpFile.Close(); err != nil {
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panic(err)
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}
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// Fuzz comments
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var untrustedComment string
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var trustedComment string
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f := fuzz.NewFromGoFuzz(data)
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f.Fuzz(&untrustedComment)
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f.Fuzz(&trustedComment)
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fmt.Printf("untrusted: %v\n", untrustedComment)
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fmt.Printf("trusted: %v\n", trustedComment)
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err = SignifySignFile(tmpFile.Name(), tmpFile.Name()+".sig", testSecKey, untrustedComment, trustedComment)
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if err != nil {
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panic(err)
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}
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defer os.Remove(tmpFile.Name() + ".sig")
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signify := "signify"
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path := os.Getenv("SIGNIFY")
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if path != "" {
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signify = path
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}
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_, err := exec.LookPath(signify)
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if err != nil {
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panic(err)
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}
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// Write the public key into the file to pass it as
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// an argument to signify-openbsd
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pubKeyFile, err := os.CreateTemp("", "")
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if err != nil {
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panic(err)
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}
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defer os.Remove(pubKeyFile.Name())
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defer pubKeyFile.Close()
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pubKeyFile.WriteString("untrusted comment: signify public key\n")
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pubKeyFile.WriteString(testPubKey)
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pubKeyFile.WriteString("\n")
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cmd := exec.Command(signify, "-V", "-p", pubKeyFile.Name(), "-x", tmpFile.Name()+".sig", "-m", tmpFile.Name())
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if output, err := cmd.CombinedOutput(); err != nil {
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panic(fmt.Sprintf("could not verify the file: %v, output: \n%s", err, output))
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}
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// Verify the signature using a golang library
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sig, err := minisign.NewSignatureFromFile(tmpFile.Name() + ".sig")
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if err != nil {
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panic(err)
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}
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pKey, err := minisign.NewPublicKey(testPubKey)
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if err != nil {
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panic(err)
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}
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valid, err := pKey.VerifyFromFile(tmpFile.Name(), sig)
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if err != nil {
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panic(err)
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}
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if !valid {
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panic("invalid signature")
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}
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return 1
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}
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func getKey(fileS string) (string, error) {
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file, err := os.Open(fileS)
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if err != nil {
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log.Fatal(err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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// Discard the first line
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scanner.Scan()
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scanner.Scan()
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return scanner.Text(), scanner.Err()
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}
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func createKeyPair() (string, string) {
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// Create key and put it in correct format
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tmpKey, err := os.CreateTemp("", "")
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if err != nil {
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panic(err)
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}
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defer os.Remove(tmpKey.Name())
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defer os.Remove(tmpKey.Name() + ".pub")
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defer os.Remove(tmpKey.Name() + ".sec")
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cmd := exec.Command("signify", "-G", "-n", "-p", tmpKey.Name()+".pub", "-s", tmpKey.Name()+".sec")
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if output, err := cmd.CombinedOutput(); err != nil {
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panic(fmt.Sprintf("could not verify the file: %v, output: \n%s", err, output))
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}
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secKey, err := getKey(tmpKey.Name() + ".sec")
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if err != nil {
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panic(err)
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}
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pubKey, err := getKey(tmpKey.Name() + ".pub")
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if err != nil {
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panic(err)
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}
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return secKey, pubKey
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}
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