Python impacket.ntlm.NTOWFv2() Examples

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Example #1
Source File: scan.py    From cve-2019-1040-scanner with MIT License 5 votes vote down vote up 
def mod_computeResponseNTLMv2(flags, serverChallenge, clientChallenge, serverName, domain, user, password, lmhash='',
                              nthash='', use_ntlmv2=USE_NTLMv2, check=False):

    responseServerVersion = b'\x01'
    hiResponseServerVersion = b'\x01'
    responseKeyNT = NTOWFv2(user, password, domain, nthash)

    av_pairs = AV_PAIRS(serverName)
    av_pairs[NTLMSSP_AV_TARGET_NAME] = 'cifs/'.encode('utf-16le') + av_pairs[NTLMSSP_AV_HOSTNAME][1]
    if av_pairs[NTLMSSP_AV_TIME] is not None:
        aTime = av_pairs[NTLMSSP_AV_TIME][1]
    else:
        aTime = struct.pack('<q', (116444736000000000 + calendar.timegm(time.gmtime()) * 10000000))
        av_pairs[NTLMSSP_AV_TIME] = aTime
    av_pairs[NTLMSSP_AV_FLAGS] = b'\x02' + b'\x00' * 3
    serverName = av_pairs.getData()

    temp = responseServerVersion + hiResponseServerVersion + b'\x00' * 6 + aTime + clientChallenge + b'\x00' * 4 + \
           serverName + b'\x00' * 4

    ntProofStr = hmac_md5(responseKeyNT, serverChallenge + temp)

    ntChallengeResponse = ntProofStr + temp
    lmChallengeResponse = hmac_md5(responseKeyNT, serverChallenge + clientChallenge) + clientChallenge
    sessionBaseKey = hmac_md5(responseKeyNT, ntProofStr)

    return ntChallengeResponse, lmChallengeResponse, sessionBaseKey