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Fix crash for large JWT timestamp values #136

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Fix crash for large JWT timestamp values #136

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60 changes: 36 additions & 24 deletions jwt_tool.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,7 @@
import random
from urllib.parse import urljoin, urlparse
import argparse
from datetime import datetime
from datetime import datetime, timezone
import configparser
from http.cookies import SimpleCookie
from collections import OrderedDict
Expand Down Expand Up @@ -1202,38 +1202,50 @@ def dissectPayl(paylDict, count=False):
countval = 0
expiredtoken = False
nowtime = int(datetime.now().timestamp())

for claim in paylDict:
countval += 1
if count:
placeholder = str(countval)
else:
placeholder = "+"
placeholder = str(countval) if count else "+"

if claim in ["exp", "nbf", "iat"]:
timestamp = datetime.fromtimestamp(int(paylDict[claim]))
if claim == "exp":
if int(timestamp.timestamp()) < nowtime:
raw_val = paylDict[claim]
try:
timestamp = datetime.fromtimestamp(int(raw_val), tz=timezone.utc)
timestr = timestamp.strftime('%Y-%m-%d %H:%M:%S') + " (UTC)"
# Only check expiry if conversion worked
if claim == "exp" and int(timestamp.timestamp()) < nowtime:
expiredtoken = True
cprintc("["+placeholder+"] "+claim+" = "+str(paylDict[claim])+" ==> TIMESTAMP = "+timestamp.strftime('%Y-%m-%d %H:%M:%S')+" (UTC)", "green")
except (OverflowError, OSError, ValueError):
# Handle extremely large or invalid timestamps gracefully
timestamp = None
timestr = f"(timestamp {raw_val} out of range)"

cprintc(f"[{placeholder}] {claim} = {raw_val} ==> TIMESTAMP = {timestr}", "green")
timeseen += 1
comparestamps.append(claim)

elif isinstance(paylDict[claim], dict):
cprintc("["+placeholder+"] "+claim+" = JSON object:", "green")
for subclaim in paylDict[claim]:
if type(castInput(paylDict[claim][subclaim])) == str:
cprintc(" [+] "+subclaim+" = \""+str(paylDict[claim][subclaim])+"\"", "green")
elif paylDict[claim][subclaim] == None:
cprintc(" [+] "+subclaim+" = null", "green")
elif paylDict[claim][subclaim] == True and not paylDict[claim][subclaim] == 1:
cprintc(" [+] "+subclaim+" = true", "green")
elif paylDict[claim][subclaim] == False and not paylDict[claim][subclaim] == 0:
cprintc(" [+] "+subclaim+" = false", "green")
else:
cprintc(" [+] "+subclaim+" = "+str(paylDict[claim][subclaim]), "green")
cprintc(f"[{placeholder}] {claim} = JSON object:", "green")
for subclaim in paylDict[claim]:
val = paylDict[claim][subclaim]
if isinstance(castInput(val), str):
cprintc(f" [+] {subclaim} = \"{val}\"", "green")
elif val is None:
cprintc(f" [+] {subclaim} = null", "green")
elif val is True and val != 1:
cprintc(f" [+] {subclaim} = true", "green")
elif val is False and val != 0:
cprintc(f" [+] {subclaim} = false", "green")
else:
cprintc(f" [+] {subclaim} = {val}", "green")

else:
if type(paylDict[claim]) == str:
cprintc("["+placeholder+"] "+claim+" = \""+str(paylDict[claim])+"\"", "green")
val = paylDict[claim]
if isinstance(val, str):
cprintc(f"[{placeholder}] {claim} = \"{val}\"", "green")
else:
cprintc("["+placeholder+"] "+claim+" = "+str(paylDict[claim]), "green")
cprintc(f"[{placeholder}] {claim} = {val}", "green")

return comparestamps, expiredtoken

def validateToken(jwt):
Expand Down