278 lines
10 KiB
Python
278 lines
10 KiB
Python
# Author: Hubert Kario, (c) 2015
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# Released under Gnu GPL v2.0, see LICENSE file for details
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"""Check if AES-GCM nonces used by server are secure"""
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from __future__ import print_function
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import traceback
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import sys
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import getopt
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from itertools import chain
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from random import sample
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from tlsfuzzer.runner import Runner
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from tlsfuzzer.messages import Connect, ClientHelloGenerator, \
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ClientKeyExchangeGenerator, ChangeCipherSpecGenerator, \
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FinishedGenerator, ApplicationDataGenerator, AlertGenerator, \
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CollectNonces
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from tlsfuzzer.expect import ExpectServerHello, ExpectCertificate, \
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ExpectServerHelloDone, ExpectChangeCipherSpec, ExpectFinished, \
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ExpectAlert, ExpectClose, ExpectApplicationData
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from tlslite.constants import CipherSuite, AlertLevel, AlertDescription, \
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ExtensionType
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from tlslite.utils.cryptomath import bytesToNumber
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from tlsfuzzer.utils.lists import natural_sort_keys
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version = 3
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def help_msg():
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print("Usage: <script-name> [-h hostname] [-p port] [[probe-name] ...]")
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print(" -h hostname name of the host to run the test against")
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print(" localhost by default")
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print(" -p port port number to use for connection, 4433 by default")
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print(" probe-name if present, will run only the probes with given")
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print(" names and not all of them, e.g \"sanity\"")
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print(" -e probe-name exclude the probe from the list of the ones run")
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print(" may be specified multiple times")
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print(" -x probe-name expect the probe to fail. When such probe passes despite being marked like this")
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print(" it will be reported in the test summary and the whole script will fail.")
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print(" May be specified multiple times.")
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print(" -X message expect the `message` substring in exception raised during")
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print(" execution of preceding expected failure probe")
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print(" usage: [-x probe-name] [-X exception], order is compulsory!")
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print(" -n num run 'num' or all(if 0) tests instead of default(all)")
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print(" (excluding \"sanity\" tests)")
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print(" --help this message")
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def main():
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"""Check if nonces used by server are monotonically increasing"""
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host = "localhost"
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port = 4433
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num_limit = None
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run_exclude = set()
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expected_failures = {}
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last_exp_tmp = None
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argv = sys.argv[1:]
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opts, args = getopt.getopt(argv, "h:p:e:x:X:n:", ["help"])
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for opt, arg in opts:
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if opt == '-h':
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host = arg
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elif opt == '-p':
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port = int(arg)
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elif opt == '-e':
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run_exclude.add(arg)
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elif opt == '-x':
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expected_failures[arg] = None
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last_exp_tmp = str(arg)
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elif opt == '-X':
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if not last_exp_tmp:
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raise ValueError("-x has to be specified before -X")
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expected_failures[last_exp_tmp] = str(arg)
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elif opt == '-n':
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num_limit = int(arg)
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elif opt == '--help':
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help_msg()
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sys.exit(0)
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else:
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raise ValueError("Unknown option: {0}".format(opt))
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if args:
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run_only = set(args)
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else:
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run_only = None
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conversations = {}
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nonces = []
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conversation = Connect(host, port)
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node = conversation
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ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
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CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
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node = node.add_child(ClientHelloGenerator(ciphers))
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node = node.add_child(ExpectServerHello())
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node = node.add_child(ExpectCertificate())
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node = node.add_child(ExpectServerHelloDone())
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node = node.add_child(ClientKeyExchangeGenerator())
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node = node.add_child(ChangeCipherSpecGenerator())
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node = node.add_child(FinishedGenerator())
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node = node.add_child(ExpectChangeCipherSpec())
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node = node.add_child(ExpectFinished())
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node = node.add_child(ApplicationDataGenerator(
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bytearray(b"GET / HTTP/1.0\n\n")))
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node = node.add_child(ExpectApplicationData())
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node = node.add_child(AlertGenerator(AlertLevel.warning,
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AlertDescription.close_notify))
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node = node.add_child(ExpectAlert())
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node.next_sibling = ExpectClose()
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conversations["sanity"] = conversation
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conversation = Connect(host, port)
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node = conversation
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ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_GCM_SHA256]
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node = node.add_child(ClientHelloGenerator(ciphers,
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extensions={ExtensionType.renegotiation_info:None}))
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node = node.add_child(ExpectServerHello(extensions={ExtensionType.renegotiation_info:None}))
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node = node.add_child(ExpectCertificate())
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node = node.add_child(ExpectServerHelloDone())
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node = node.add_child(ClientKeyExchangeGenerator())
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node = node.add_child(ChangeCipherSpecGenerator())
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node = node.add_child(FinishedGenerator())
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node = node.add_child(ExpectChangeCipherSpec())
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node = node.add_child(CollectNonces(nonces))
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node = node.add_child(ExpectFinished())
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node = node.add_child(ApplicationDataGenerator(
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bytearray(b"GET / HTTP/1.0\n\n")))
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node = node.add_child(ExpectApplicationData())
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node = node.add_child(AlertGenerator(AlertLevel.warning,
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AlertDescription.close_notify))
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node = node.add_child(ExpectAlert())
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node.next_sibling = ExpectClose()
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conversations["aes-128-gcm cipher"] = conversation
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nonces256 = []
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conversation = Connect(host, port)
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node = conversation
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ciphers = [CipherSuite.TLS_RSA_WITH_AES_256_GCM_SHA384]
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node = node.add_child(ClientHelloGenerator(ciphers,
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extensions={ExtensionType.renegotiation_info:None}))
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node = node.add_child(ExpectServerHello(extensions={ExtensionType.renegotiation_info:None}))
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node = node.add_child(ExpectCertificate())
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node = node.add_child(ExpectServerHelloDone())
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node = node.add_child(ClientKeyExchangeGenerator())
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node = node.add_child(ChangeCipherSpecGenerator())
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node = node.add_child(FinishedGenerator())
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node = node.add_child(ExpectChangeCipherSpec())
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node = node.add_child(CollectNonces(nonces256))
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node = node.add_child(ExpectFinished())
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node = node.add_child(ApplicationDataGenerator(
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bytearray(b"GET / HTTP/1.0\n\n")))
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node = node.add_child(ExpectApplicationData())
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node = node.add_child(AlertGenerator(AlertLevel.warning,
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AlertDescription.close_notify))
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node = node.add_child(ExpectAlert())
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node.next_sibling = ExpectClose()
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conversations["aes-256-gcm cipher"] = conversation
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good = 0
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bad = 0
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xfail = 0
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xpass = 0
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failed = []
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xpassed = []
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if not num_limit:
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num_limit = len(conversations)
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# make sure that sanity test is run first and last
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# to verify that server was running and kept running throughout
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sanity_tests = [('sanity', conversations['sanity'])]
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if run_only:
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if num_limit > len(run_only):
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num_limit = len(run_only)
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regular_tests = [(k, v) for k, v in conversations.items() if
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k in run_only]
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else:
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regular_tests = [(k, v) for k, v in conversations.items() if
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(k != 'sanity') and k not in run_exclude]
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sampled_tests = sample(regular_tests, min(num_limit, len(regular_tests)))
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ordered_tests = chain(sanity_tests, sampled_tests, sanity_tests)
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for c_name, c_test in ordered_tests:
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if run_only and c_name not in run_only or c_name in run_exclude:
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continue
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print("{0} ...".format(c_name))
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runner = Runner(c_test)
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res = True
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exception = None
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try:
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runner.run()
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except Exception as exp:
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exception = exp
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print("Error while processing")
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print(traceback.format_exc())
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res = False
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if c_name in expected_failures:
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if res:
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xpass += 1
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xpassed.append(c_name)
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print("XPASS-expected failure but test passed\n")
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else:
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if expected_failures[c_name] is not None and \
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expected_failures[c_name] not in str(exception):
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bad += 1
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failed.append(c_name)
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print("Expected error message: {0}\n"
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.format(expected_failures[c_name]))
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else:
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xfail += 1
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print("OK-expected failure\n")
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else:
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if res:
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good += 1
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print("OK\n")
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else:
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bad += 1
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failed.append(c_name)
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print("aes-128-gcm Nonce monotonicity...")
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if len(nonces) < 2:
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print("Not enough nonces collected, FAIL")
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bad += 1
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else:
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if bytesToNumber(nonces[0]) == bytesToNumber(nonces[1]):
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print("reused nonce! Security vulnerability!")
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bad += 1
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elif bytesToNumber(nonces[0]) + 1 != bytesToNumber(nonces[1]):
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print("nonce not monotonically increasing, FAIL")
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bad += 1
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else:
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print("OK\n")
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good += 1
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print("aes-256-gcm Nonce monotonicity...")
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if len(nonces256) < 2:
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print("Not enough nonces collected, FAIL")
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bad += 1
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else:
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if bytesToNumber(nonces256[0]) == bytesToNumber(nonces256[1]):
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print("reused nonce! Security vulnerability!")
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bad += 1
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elif bytesToNumber(nonces256[0]) + 1 != bytesToNumber(nonces256[1]):
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print("nonce not monotonically increasing, FAIL")
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bad += 1
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else:
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print("OK\n")
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good += 1
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print("Test end")
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print(20 * '=')
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print("version: {0}".format(version))
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print(20 * '=')
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print("TOTAL: {0}".format(len(sampled_tests) + 2*len(sanity_tests) + 2))
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print("SKIP: {0}".format(len(run_exclude.intersection(conversations.keys()))))
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print("PASS: {0}".format(good))
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print("XFAIL: {0}".format(xfail))
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print("FAIL: {0}".format(bad))
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print("XPASS: {0}".format(xpass))
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print(20 * '=')
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sort = sorted(xpassed ,key=natural_sort_keys)
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if len(sort):
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print("XPASSED:\n\t{0}".format('\n\t'.join(repr(i) for i in sort)))
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sort = sorted(failed, key=natural_sort_keys)
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if len(sort):
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print("FAILED:\n\t{0}".format('\n\t'.join(repr(i) for i in sort)))
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if bad or xpass:
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sys.exit(1)
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if __name__ == "__main__":
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main()
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