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main.go
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main.go
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package main
import (
"bufio"
"crypto/hmac"
"crypto/sha256"
"encoding/base64"
"encoding/json"
"flag"
"fmt"
"log"
"os"
"strings"
"sync"
)
type Header struct {
Typ string `json:"typ"`
Alg string `json:"alg"`
}
type Token struct {
header string
payload string
signature []byte
}
func main() {
var workerCount int
flag.IntVar(&workerCount, "c", 10, "set concurrent workers")
var tokenFile string
flag.StringVar(&tokenFile, "t", "", "File containing JWT token(s)")
var dictFile string
flag.StringVar(&dictFile, "d", "", "Dictionary file. If ommited, will read from stdin")
flag.Parse()
if tokenFile == "" {
log.Fatal("Must specify -t")
}
var inputStream *bufio.Scanner
if dictFile == "" {
inputStream = bufio.NewScanner(os.Stdin)
} else {
file, err := os.Open(dictFile)
defer file.Close()
if err != nil {
log.Fatal(err)
}
inputStream = bufio.NewScanner(file)
}
file, err := os.Open(tokenFile)
if err != nil {
log.Fatal(err)
}
s := bufio.NewScanner(file)
s.Scan()
t := s.Text()
crackJWT(t, workerCount, inputStream)
}
func crackJWT(token string, workerCount int, scanner *bufio.Scanner) bool {
var wg sync.WaitGroup
queue := make(chan string)
t := parseToken(token)
for i := 0; i < workerCount; i++ {
wg.Add(1)
go func() {
for secret := range queue {
headerPayload := t.header + "." + t.payload
isMatch := checkSignature(secret, []byte(headerPayload), t.signature)
if isMatch == true {
fmt.Println(secret + "\t" + token)
os.Exit(0)
}
}
wg.Done()
}()
}
for scanner.Scan() {
queue <- scanner.Text()
}
close(queue)
wg.Wait()
return true
}
func checkSignature(secret string, headerPayload []byte, validSignature []byte) bool {
var h = hmac.New(sha256.New, []byte(secret))
h.Write(headerPayload)
if hmac.Equal(h.Sum(nil), validSignature) {
return true
}
return false
}
func parseToken(token string) Token {
var t = strings.Split(token, ".")
if len(t) != 3 {
fmt.Println("Invalid token")
os.Exit(1)
}
header := t[0]
str, err := base64.RawURLEncoding.DecodeString(header)
//fmt.Printf("%q\n", str)
if err != nil {
log.Fatal(err)
}
var h Header
err = json.Unmarshal([]byte(str), &h)
if err != nil {
log.Fatal(err)
}
if h.Typ != "JWT" {
log.Fatal("Invalid token")
}
if h.Alg != "HS256" {
log.Fatal("Currently only HS256 is supported")
}
base64Sig := t[2]
s, err := base64.RawURLEncoding.DecodeString(base64Sig)
if err != nil {
log.Fatal(err)
}
ts := Token{header: t[0], payload: t[1], signature: s}
return ts
}