# Author: Hubert Kario, (c) 2018
# Released under Gnu GPL v2.0, see LICENSE file for details

from __future__ import print_function
import traceback
import sys
import getopt
from itertools import chain
from random import sample

from tlsfuzzer.runner import Runner
from tlsfuzzer.messages import Connect, ClientHelloGenerator, \
        ClientKeyExchangeGenerator, ChangeCipherSpecGenerator, \
        FinishedGenerator, ApplicationDataGenerator, AlertGenerator, \
        fuzz_message, ResetHandshakeHashes, \
        CertificateGenerator, CertificateVerifyGenerator
from tlsfuzzer.expect import ExpectServerHello, ExpectCertificate, \
        ExpectServerHelloDone, ExpectChangeCipherSpec, ExpectFinished, \
        ExpectAlert, ExpectApplicationData, ExpectClose, ExpectServerKeyExchange,\
        ExpectNoMessage, ExpectCertificateRequest, ExpectHelloRequest

from tlslite.constants import CipherSuite, AlertLevel, AlertDescription, \
        ExtensionType, SignatureScheme, GroupName
from tlslite.extensions import ALPNExtension, TLSExtension, \
        SignatureAlgorithmsExtension, SignatureAlgorithmsCertExtension, \
        SupportedGroupsExtension
from tlslite.utils.keyfactory import parsePEMKey
from tlslite.x509 import X509
from tlslite.x509certchain import X509CertChain
from tlsfuzzer.utils.lists import natural_sort_keys


version = 5


def help_msg():
    print("Usage: <script-name> [-h hostname] [-p port] [[probe-name] ...]")
    print(" -h hostname    name of the host to run the test against")
    print("                localhost by default")
    print(" -p port        port number to use for connection, 4433 by default")
    print(" probe-name     if present, will run only the probes with given")
    print("                names and not all of them, e.g \"sanity\"")
    print(" -d             Use (EC)DHE instead of RSA for key exchange")
    print(" -e probe-name  exclude the probe from the list of the ones run")
    print("                may be specified multiple times")
    print(" -x probe-name  expect the probe to fail. When such probe passes despite being marked like this")
    print("                it will be reported in the test summary and the whole script will fail.")
    print("                May be specified multiple times.")
    print(" -X message     expect the `message` substring in exception raised during")
    print("                execution of preceding expected failure probe")
    print("                usage: [-x probe-name] [-X exception], order is compulsory!")
    print(" -n num         run 'num' or all(if 0) tests instead of default(all)")
    print("                (excluding \"sanity\" tests)")
    print(" --no-ins-renego expect the insecure renegotiation to be unsupported")
    print(" --early-abort  server aborts as soon as we ask for restricted resource")
    print(" -k file.pem    file with private key for client")
    print(" -c file.pem    file with certificate for client")
    print(" --help         this message")


def main():
    host = "localhost"
    port = 4433
    num_limit = None
    run_exclude = set()
    expected_failures = {}
    last_exp_tmp = None
    no_ins_renego = False
    private_key = None
    cert = None
    early_abort = False
    dhe = False

    argv = sys.argv[1:]
    opts, args = getopt.getopt(argv, "h:p:e:x:X:n:k:c:d", ["help", "no-ins-renego",
                                                      "early-abort"])
    for opt, arg in opts:
        if opt == '-h':
            host = arg
        elif opt == '-p':
            port = int(arg)
        elif opt == '-e':
            run_exclude.add(arg)
        elif opt == '-x':
            expected_failures[arg] = None
            last_exp_tmp = str(arg)
        elif opt == '-X':
            if not last_exp_tmp:
                raise ValueError("-x has to be specified before -X")
            expected_failures[last_exp_tmp] = str(arg)
        elif opt == '-d':
            dhe = True
        elif opt == '-n':
            num_limit = int(arg)
        elif opt == '--no-ins-renego':
            no_ins_renego = True
        elif opt == '--help':
            help_msg()
            sys.exit(0)
        elif opt == '--early-abort':
            early_abort = True
        elif opt == '-k':
            text_key = open(arg, 'rb').read()
            if sys.version_info[0] >= 3:
                text_key = str(text_key, 'utf-8')
            private_key = parsePEMKey(text_key, private=True)
        elif opt == '-c':
            text_cert = open(arg, 'rb').read()
            if sys.version_info[0] >= 3:
                text_cert = str(text_cert, 'utf-8')
            cert = X509()
            cert.parse(text_cert)
        else:
            raise ValueError("Unknown option: {0}".format(opt))

    if not private_key:
        raise ValueError("Specify private key file using -k")
    if not cert:
        raise ValueError("Specify certificate file using -c")

    if args:
        run_only = set(args)
    else:
        run_only = None

    conversations = {}

    conversation = Connect(host, port)
    node = conversation
    sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                SignatureScheme.rsa_pss_pss_sha256,
                SignatureScheme.rsa_pkcs1_sha256,
                SignatureScheme.ecdsa_secp256r1_sha256]
    if dhe:
        ext = {}
        groups = [GroupName.secp256r1,
                  GroupName.ffdhe2048]
        ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
                .create(groups)
        ciphers = [CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    else:
        ext = {}
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_EMPTY_RENEGOTIATION_INFO_SCSV]
    ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
        .create(sig_algs)
    ext[ExtensionType.signature_algorithms_cert] = \
        SignatureAlgorithmsCertExtension().create(sig_algs)
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET /?Renegotiation_Test=tlsfuzzer HTTP/1.0\r\n\r\n")))
    node = node.add_child(ExpectApplicationData())
    node = node.add_child(AlertGenerator(AlertLevel.warning,
                                         AlertDescription.close_notify))
    node = node.add_child(ExpectAlert())
    node.next_sibling = ExpectClose()
    conversations["sanity"] = conversation

    # renegotiation
    conversation = Connect(host, port)
    node = conversation

    sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                SignatureScheme.rsa_pss_pss_sha256,
                SignatureScheme.rsa_pkcs1_sha256,
                SignatureScheme.ecdsa_secp256r1_sha256]
    if dhe:
        ext = {ExtensionType.renegotiation_info:None}
        groups = [GroupName.secp256r1,
                  GroupName.ffdhe2048]
        ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
                .create(groups)
        ciphers = [CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA]
    else:
        ext = {ExtensionType.renegotiation_info:None}
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA]
    ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
        .create(sig_algs)
    ext[ExtensionType.signature_algorithms_cert] = \
        SignatureAlgorithmsCertExtension().create(sig_algs)
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    ext = {ExtensionType.renegotiation_info: None}
    node = node.add_child(ExpectServerHello(extensions=ext))
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    # send GET request
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET /secure/test HTTP/1.0\r\n\r\n")))
    # 2nd handshake
    node = node.add_child(ExpectHelloRequest())
    node = node.add_child(ResetHandshakeHashes())
    ext = {ExtensionType.renegotiation_info:None}
    ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
        .create(sig_algs)
    ext[ExtensionType.signature_algorithms_cert] = \
        SignatureAlgorithmsCertExtension().create(sig_algs)
    node = node.add_child(ClientHelloGenerator(ciphers,
                                               session_id=bytearray(0),
                                               extensions=ext))
    ext = {ExtensionType.renegotiation_info: None}
    node = node.add_child(ExpectServerHello(extensions=ext))
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectCertificateRequest())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(CertificateGenerator(X509CertChain([cert])))
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(CertificateVerifyGenerator(private_key))
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    node = node.add_child(ExpectApplicationData())
    conversations["try secure renegotiation"] = conversation

    # insecure renegotiation
    conversation = Connect(host, port)
    node = conversation
    sig_algs = [SignatureScheme.rsa_pss_rsae_sha256,
                SignatureScheme.rsa_pss_pss_sha256,
                SignatureScheme.rsa_pkcs1_sha256,
                SignatureScheme.ecdsa_secp256r1_sha256]
    if dhe:
        ext = {ExtensionType.renegotiation_info:None}
        groups = [GroupName.secp256r1,
                  GroupName.ffdhe2048]
        ext[ExtensionType.supported_groups] = SupportedGroupsExtension()\
                .create(groups)
        ciphers = [CipherSuite.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
                   CipherSuite.TLS_DHE_RSA_WITH_AES_128_CBC_SHA]
    else:
        ext = {ExtensionType.renegotiation_info:None}
        ciphers = [CipherSuite.TLS_RSA_WITH_AES_128_CBC_SHA]
    ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
        .create(sig_algs)
    ext[ExtensionType.signature_algorithms_cert] = \
        SignatureAlgorithmsCertExtension().create(sig_algs)
    node = node.add_child(ClientHelloGenerator(ciphers, extensions=ext))
    node = node.add_child(ExpectServerHello())
    node = node.add_child(ExpectCertificate())
    if dhe:
        node = node.add_child(ExpectServerKeyExchange())
    node = node.add_child(ExpectServerHelloDone())
    node = node.add_child(ClientKeyExchangeGenerator())
    node = node.add_child(ChangeCipherSpecGenerator())
    node = node.add_child(FinishedGenerator())
    node = node.add_child(ExpectChangeCipherSpec())
    node = node.add_child(ExpectFinished())
    # send GET request
    node = node.add_child(ApplicationDataGenerator(
        bytearray(b"GET /secure/test HTTP/1.0\r\n\r\n")))
    if early_abort:
        node = node.add_child(ExpectAlert(AlertLevel.fatal,
                                          AlertDescription.handshake_failure))
        node = node.add_child(ExpectClose())
    else:
        node = node.add_child(ExpectHelloRequest())
        # 2nd handshake
        node = node.add_child(ResetHandshakeHashes())
        ext = {}
        ext[ExtensionType.signature_algorithms] = SignatureAlgorithmsExtension()\
            .create(sig_algs)
        ext[ExtensionType.signature_algorithms_cert] = \
                    SignatureAlgorithmsCertExtension().create(sig_algs)
        node = node.add_child(ClientHelloGenerator(ciphers,
                                                   session_id=bytearray(0),
                                                   extensions=ext))
        if no_ins_renego:
            node = node.add_child(ExpectAlert(AlertLevel.fatal,
                                              AlertDescription.handshake_failure))
            node = node.add_child(ExpectClose())
        else:
            node = node.add_child(ExpectServerHello())
            node = node.add_child(ExpectCertificate())
            if dhe:
                node = node.add_child(ExpectServerKeyExchange())
            node = node.add_child(ExpectCertificateRequest())
            node = node.add_child(ExpectServerHelloDone())
            node = node.add_child(CertificateGenerator(X509CertChain([cert])))
            node = node.add_child(ClientKeyExchangeGenerator())
            node = node.add_child(CertificateVerifyGenerator(private_key))
            node = node.add_child(ChangeCipherSpecGenerator())
            node = node.add_child(FinishedGenerator())
            node = node.add_child(ExpectChangeCipherSpec())
            node = node.add_child(ExpectFinished())
            node = node.add_child(ExpectApplicationData())
    conversations["try insecure (legacy) renegotiation"] = conversation

    # run the conversation
    good = 0
    bad = 0
    xfail = 0
    xpass = 0
    failed = []
    xpassed = []
    if not num_limit:
        num_limit = len(conversations)

    # make sure that sanity test is run first and last
    # to verify that server was running and kept running throughout
    sanity_tests = [('sanity', conversations['sanity'])]
    if run_only:
        if num_limit > len(run_only):
            num_limit = len(run_only)
        regular_tests = [(k, v) for k, v in conversations.items() if
                          k in run_only]
    else:
        regular_tests = [(k, v) for k, v in conversations.items() if
                         (k != 'sanity') and k not in run_exclude]
    sampled_tests = sample(regular_tests, min(num_limit, len(regular_tests)))
    ordered_tests = chain(sanity_tests, sampled_tests, sanity_tests)

    for c_name, c_test in ordered_tests:
        if run_only and c_name not in run_only or c_name in run_exclude:
            continue
        print("{0} ...".format(c_name))

        runner = Runner(c_test)

        res = True
        exception = None
        try:
            runner.run()
        except Exception as exp:
            exception = exp
            print("Error while processing")
            print(traceback.format_exc())
            res = False

        if c_name in expected_failures:
            if res:
                xpass += 1
                xpassed.append(c_name)
                print("XPASS-expected failure but test passed\n")
            else:
                if expected_failures[c_name] is not None and  \
                    expected_failures[c_name] not in str(exception):
                        bad += 1
                        failed.append(c_name)
                        print("Expected error message: {0}\n"
                            .format(expected_failures[c_name]))
                else:
                    xfail += 1
                    print("OK-expected failure\n")
        else:
            if res:
                good += 1
                print("OK\n")
            else:
                bad += 1
                failed.append(c_name)

    print("Verify that the server disabled renegotiation (both legacy")
    print("and secure). Use client certificates for the test.\n")
    print("Test expects the server to ask for renegotiation after the client")
    print("asks for \"/secure/test\" resource\n")

    print("Test end")
    print(20 * '=')
    print("version: {0}".format(version))
    print(20 * '=')
    print("TOTAL: {0}".format(len(sampled_tests) + 2*len(sanity_tests)))
    print("SKIP: {0}".format(len(run_exclude.intersection(conversations.keys()))))
    print("PASS: {0}".format(good))
    print("XFAIL: {0}".format(xfail))
    print("FAIL: {0}".format(bad))
    print("XPASS: {0}".format(xpass))
    print(20 * '=')
    sort = sorted(xpassed ,key=natural_sort_keys)
    if len(sort):
        print("XPASSED:\n\t{0}".format('\n\t'.join(repr(i) for i in sort)))
    sort = sorted(failed, key=natural_sort_keys)
    if len(sort):
        print("FAILED:\n\t{0}".format('\n\t'.join(repr(i) for i in sort)))

    if bad or xpass:
        sys.exit(1)

if __name__ == "__main__":
    main()