MeshCentral/test.js

/*
YST: create_negotiate_message: 4e544c4d53535000010000003582086000000000000000000000000000000000
WRITE: negotiate_message 302fa003020102a12830263024a02204204e544c4d53535000010000003582086000000000000000000000000000000000
READ: read_ts_server_challenge 3081b2a003020106a181aa3081a73081a4a081a104819e4e544c4d53535000020000000e000e003800000035828a62f2290572b3cac375000000000000000058005800460000000a00614a0000000f430045004e005400520041004c0002000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000
YST: read_challenge_message1: 4e544c4d53535000020000000e000e003800000035828a62f2290572b3cac375000000000000000058005800460000000a00614a0000000f430045004e005400520041004c0002000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000
YST: target_name: 02000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000
YST: timestamp: afbc2c2a9256d801
YST: client_challenge: f8d1e2057b9c7169
YST: nt_challenge_response: 32e87ea049485920fca6695ae9daee820101000000000000afbc2c2a9256d801f8d1e2057b9c71690000000002000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000
YST: lm_challenge_response: 2b0f863797a00d4446a1c9f49de124a5f8d1e2057b9c7169
YST: session_base_key: 52f86f741e92e2e9d8013c1afcecfa13
YST: key_exchange_key: 52f86f741e92e2e9d8013c1afcecfa13
YST: encrypted_random_session_key: d9b2353a7f7ba9569ece01e96686cdef
YST: self.is_unicode: true
YST: domain:
YST: user: 640065006600610075006c007400
YST: tmp_final_auth_message: 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
YST: signature: 4cbff4ee21ce4114c7657d7aa427ca3f
YST: read_challenge_message2: 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
WRITE challenge: 30820251a003020102a18201223082011e3082011aa0820116048201124e544c4d53535000030000001800180058000000840084007000000000000000f40000000e000e00f40000000000000002010000100010000201000035828a62060072170000000f4cbff4ee21ce4114c7657d7aa427ca3f2b0f863797a00d4446a1c9f49de124a5f8d1e2057b9c716932e87ea049485920fca6695ae9daee820101000000000000afbc2c2a9256d801f8d1e2057b9c71690000000002000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000640065006600610075006c007400d9b2353a7f7ba9569ece01e96686cdefa38201220482011e0100000095fb7df84ffcd81d00000000a0588a3354258442e2997c79a4005e91ac49759b3c362228f42aefa5daad071a8eb905d7bc16611df35a50c0c577acf4543609e3ade8ff8289d371d8baed9eb2bd738de6c208f6a9885f1b0ee8aee2b26be87aa189bb41989c79716d938eb68e2f1e4bdc74c25e995c438aa5e5e30c2784214f4763c6737417edac43371f65f22aab68619f022b2f46b4cb9d00d0befe6d7e83d0d2c4ae69b544b1e90b1d5198459722eff903e8550864a46c552d75c83fb8ca8491b573fcd59d17cdc34e2505995fa6922554fdf03016161b430e476875a3752907087e993388f56675957a75b42b062f1f66ef8597a69deb466337396747ec8e46c573344b24fc8fba9305207eb10462ce355299063bab4cf105
READ: read_ts_validate 3081b2a003020106a181aa3081a73081a4a081a104819e4e544c4d53535000020000000e000e003800000035828a62f2290572b3cac375000000000000000058005800460000000a00614a0000000f430045004e005400520041004c0002000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000
WRITE credentials: 302fa003020102a12830263024a02204204e544c4d53535000010000003582086000000000000000000000000000000000
*/

/*
        "Signature" => Check::new(b"NTLMSSP\x00".to_vec()),
        "MessageType" => Check::new(U32::LE(2)),
        "TargetNameLen" => U16::LE(0),
        "TargetNameLenMax" => U16::LE(0),
        "TargetNameBufferOffset" => U32::LE(0),
        "NegotiateFlags" => DynOption::new(U32::LE(0), |node| {
            if node.inner() & (Negotiate::NtlmsspNegociateVersion as u32) == 0 {
                return MessageOption::SkipField("Version".to_string())
            }
            return MessageOption::None
        }),
        "ServerChallenge" => vec![0; 8],
        "Reserved" => vec![0; 8],
        "TargetInfoLen" => U16::LE(0),
        "TargetInfoMaxLen" => U16::LE(0),
        "TargetInfoBufferOffset" => U32::LE(0),
        "Version" => version(),
        "Payload" => Vec::<u8>::new()
*/

const NegotiateFlags = {
    NtlmsspNegociate56: 0x80000000,
    NtlmsspNegociateKeyExch: 0x40000000,
    NtlmsspNegociate128: 0x20000000,
    NtlmsspNegociateVersion: 0x02000000,
    NtlmsspNegociateTargetInfo: 0x00800000,
    NtlmsspRequestNonNTSessionKey: 0x00400000,
    NtlmsspNegociateIdentify: 0x00100000,
    NtlmsspNegociateExtendedSessionSecurity: 0x00080000,
    NtlmsspTargetTypeServer: 0x00020000,
    NtlmsspTargetTypeDomain: 0x00010000,
    NtlmsspNegociateAlwaysSign: 0x00008000,
    NtlmsspNegociateOEMWorkstationSupplied: 0x00002000,
    NtlmsspNegociateOEMDomainSupplied: 0x00001000,
    NtlmsspNegociateNTLM: 0x00000200,
    NtlmsspNegociateLMKey: 0x00000080,
    NtlmsspNegociateDatagram: 0x00000040,
    NtlmsspNegociateSeal: 0x00000020,
    NtlmsspNegociateSign: 0x00000010,
    NtlmsspRequestTarget: 0x00000004,
    NtlmNegotiateOEM: 0x00000002,
    NtlmsspNegociateUnicode: 0x00000001
}

const MajorVersion = {
    WindowsMajorVersion5: 0x05,
    WindowsMajorVersion6: 0x06
}

const MinorVersion = {
    WindowsMinorVersion0: 0x00,
    WindowsMinorVersion1: 0x01,
    WindowsMinorVersion2: 0x02,
    WindowsMinorVersion3: 0x03
}

const NTLMRevision = {
    NtlmSspRevisionW2K3: 0x0F
}

function decodeTargetInfo(targetInfoBuf) {
    var r = {}, type, len, data, ptr = 0;
    while (true) {
        type = targetInfoBuf.readInt16LE(ptr);
        if (type == 0) break;
        len = targetInfoBuf.readInt16LE(ptr + 2);
        r[type] = targetInfoBuf.slice(ptr + 4, ptr + 4 + len);
        ptr += (4 + len);
    }
    return r;
}

function bufToArr(b) { var r = []; for (var i = 0; i < b.length; i++) { r.push(b.readUInt8(i)); } return r; } // For unit testing
function toUnicode(str) { return Buffer.from(str, 'ucs2'); }
function md4(str) { return crypto.createHash('md4').update(str).digest(); }
function md5(str) { return crypto.createHash('md5').update(str).digest(); }
function hmacmd5(key, data) { return crypto.createHmac('md5', key).update(data).digest(); }
function ntowfv2(password, user, domain) { return hmacmd5(md4(toUnicode(password)), toUnicode(user.toUpperCase() + domain)); }
function lmowfv2(password, user, domain) { return ntowfv2(password, user, domain); }
function zeroBuffer(len) { return Buffer.alloc(len); }
function compute_response_v2(response_key_nt, response_key_lm, server_challenge, client_challenge, time, server_name) {
    const response_version = Buffer.from('01', 'hex');
    const hi_response_version = Buffer.from('01', 'hex');
    const temp = Buffer.concat([response_version, hi_response_version, zeroBuffer(6), time, client_challenge, zeroBuffer(4), server_name]);
    const nt_proof_str = hmacmd5(response_key_nt, Buffer.concat([server_challenge, temp]));
    const nt_challenge_response = Buffer.concat([nt_proof_str, temp]);
    const lm_challenge_response = Buffer.concat([hmacmd5(response_key_lm, Buffer.concat([server_challenge, client_challenge])), client_challenge]);
    const session_base_key = hmacmd5(response_key_nt, nt_proof_str);
    return [nt_challenge_response, lm_challenge_response, session_base_key];
}
function kx_key_v2(session_base_key, _lm_challenge_response, _server_challenge) { return session_base_key; }
function rc4k(key, data) { return crypto.createCipheriv('rc4', key, null).update(data); }

/// Compute a signature of all data exchange during NTLMv2 handshake
function mic(exported_session_key, negotiate_message, challenge_message, authenticate_message) { return hmacmd5(exported_session_key, Buffer.concat([negotiate_message, challenge_message, authenticate_message])); }

/// NTLMv2 security interface generate a sign key
/// By using MD5 of the session key + a static member (sentense)
function sign_key(exported_session_key, is_client) {
    if (is_client) {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to client-to-server signing key magic constant\0")]));
    } else {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to server-to-client signing key magic constant\0")]));
    }
}

/// NTLMv2 security interface generate a seal key
/// By using MD5 of the session key + a static member (sentense)
function seal_key(exported_session_key, is_client) {
    if (is_client) {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to client-to-server sealing key magic constant\0")]));
    } else {
        return md5(Buffer.concat([exported_session_key, Buffer.from("session key to server-to-client sealing key magic constant\0")]));
    }
}

function authenticate_message(lm_challenge_response, nt_challenge_response, domain, user, workstation, encrypted_random_session_key, flags) {
    const payload = Buffer.concat([lm_challenge_response, nt_challenge_response, domain, user, workstation, encrypted_random_session_key]);
    const offset = ((flags & NegotiateFlags.NtlmsspNegociateVersion) == 0) ? 80 : 88;
    const buf = Buffer.alloc(offset - 16);
    buf.write('4e544c4d53535000', 0, 8, 'hex'); // Signature
    buf.writeInt32LE(3, 8); // MessageType
    buf.writeInt16LE(lm_challenge_response.length, 12); // LmChallengeResponseLen
    buf.writeInt16LE(lm_challenge_response.length, 14); // LmChallengeResponseMaxLen
    buf.writeInt32LE(offset, 16); // LmChallengeResponseBufferOffset
    buf.writeInt16LE(nt_challenge_response.length, 20); // NtChallengeResponseLen
    buf.writeInt16LE(nt_challenge_response.length, 22); // NtChallengeResponseMaxLen
    buf.writeInt32LE(offset + lm_challenge_response.length, 24); // NtChallengeResponseBufferOffset
    buf.writeInt16LE(domain.length, 28); // DomainNameLen
    buf.writeInt16LE(domain.length, 30); // DomainNameMaxLen
    buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length, 32); // DomainNameBufferOffset
    buf.writeInt16LE(user.length, 36); // UserNameLen
    buf.writeInt16LE(user.length, 38); // UserNameMaxLen
    buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length + domain.length, 40); // UserNameBufferOffset
    buf.writeInt16LE(workstation.length, 44); // WorkstationLen
    buf.writeInt16LE(workstation.length, 46); // WorkstationMaxLen
    buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length + domain.length + user.length, 48); // WorkstationBufferOffset
    buf.writeInt16LE(encrypted_random_session_key.length, 52); // EncryptedRandomSessionLen
    buf.writeInt16LE(encrypted_random_session_key.length, 54); // EncryptedRandomSessionMaxLen
    buf.writeInt32LE(offset + lm_challenge_response.length + nt_challenge_response.length + domain.length + user.length + workstation.length, 56); // EncryptedRandomSessionBufferOffset
    buf.writeInt32LE(flags, 60); // NegotiateFlags
    if ((flags & NegotiateFlags.NtlmsspNegociateVersion) != 0) {
        buf.writeUInt8(MajorVersion.WindowsMajorVersion6, 64); // ProductMajorVersion
        buf.writeUInt8(MinorVersion.WindowsMinorVersion0, 65); // ProductMinorVersion
        buf.writeInt16LE(6002, 66); // ProductBuild
        //buf.writeInt16LE(0, 68); // Reserved
        //buf.writeUInt8(0, 70); // Reserved
        buf.writeUInt8(NTLMRevision.NtlmSspRevisionW2K3, 71); // NTLMRevisionCurrent
    }
    return [buf, payload];
}

function read_challenge_message(derBuffer, user, pass, domain, negotiate_message) {
    const headerSignature = derBuffer.slice(0, 8);
    if (headerSignature.toString('hex') != '4e544c4d53535000') { console.log('BAD SIGNATURE'); }
    const messageType = derBuffer.readInt32LE(8);
    if (messageType != 2) { console.log('BAD MESSAGE TYPE'); }
    const targetNameLen = derBuffer.readInt16LE(12);
    const targetNameLenMax = derBuffer.readInt16LE(14);
    const targetNameBufferOffset = derBuffer.readInt32LE(16);
    const negotiateFlags = derBuffer.readInt32LE(20);
    const serverChallenge = derBuffer.slice(24, 32);
    const reserved = derBuffer.slice(32, 40);
    if (reserved.toString('hex') != '0000000000000000') { console.log('BAD RESERVED'); }
    const targetInfoLen = derBuffer.readInt16LE(40);
    const targetInfoLenMax = derBuffer.readInt16LE(42);
    const targetInfoBufferOffset = derBuffer.readInt32LE(44);
    const targetName = derBuffer.slice(targetNameBufferOffset, targetNameBufferOffset + targetNameLen);
    const targetInfo = decodeTargetInfo(derBuffer.slice(targetInfoBufferOffset, targetInfoBufferOffset + targetInfoLen));
    const timestamp = targetInfo[7];
    if (timestamp == null) { console.log('NO TIMESTAMP'); }
    const clientChallenge = crypto.randomBytes(8);
    const response_key_nt = ntowfv2(pass, user, domain); // Password, Username, Domain
    const response_key_lm = lmowfv2(pass, user, domain); // Password, Username, Domain

    var resp = compute_response_v2(response_key_nt, response_key_lm, serverChallenge, clientChallenge, timestamp, targetName);
    const nt_challenge_response = resp[0];
    const lm_challenge_response = resp[1];
    const session_base_key = resp[2];

    const key_exchange_key = kx_key_v2(session_base_key, lm_challenge_response, serverChallenge);
    const exported_session_key = crypto.randomBytes(16);
    const encrypted_random_session_key = rc4k(key_exchange_key, exported_session_key);

    const is_unicode = ((negotiateFlags & 1) != 0)
    var xdomain = null;
    var xuser = null;
    if (is_unicode) {
        xdomain = toUnicode(domain);
        xuser = toUnicode(user);
    } else {
        xdomain = Buffer.from(domain, 'utf8');
        xuser = Buffer.from(domain, 'utf8');
    }

    const auth_message_compute = authenticate_message(lm_challenge_response, nt_challenge_response, xdomain, xuser, zeroBuffer(0), encrypted_random_session_key, negotiateFlags);

    // Write a tmp message to compute MIC and then include it into final message
    const tmp_final_auth_message = Buffer.concat([auth_message_compute[0], zeroBuffer(16), auth_message_compute[1]]);

    const signature = mic(exported_session_key, negotiate_message, derBuffer, tmp_final_auth_message);
    return Buffer.concat([auth_message_compute[0], signature, auth_message_compute[1]]);
}



// Create create_ts_request
const crypto = require('crypto');
const forge = require('node-forge');
const asn1 = forge.asn1;
const pki = forge.pki;
const entireBuffer = Buffer.from('3081b2a003020106a181aa3081a73081a4a081a104819e4e544c4d53535000020000000e000e003800000035828a62f2290572b3cac375000000000000000058005800460000000a00614a0000000f430045004e005400520041004c0002000e00430045004e005400520041004c0001000e00430045004e005400520041004c0004000e00430065006e007400720061006c0003000e00430065006e007400720061006c0007000800afbc2c2a9256d80100000000', 'hex').toString('binary');

// We have a full ASN1 data block, decode it now
const der = asn1.fromDer(entireBuffer.toString('binary'));
const derNum = der.value[0].value[0].value.charCodeAt(0);
const derBuffer = Buffer.from(der.value[1].value[0].value[0].value[0].value[0].value, 'binary');
const negotiate_message = Buffer.from('4e544c4d53535000010000003582086000000000000000000000000000000000', 'hex');
const client_challenge = read_challenge_message(derBuffer, "default", "", "", negotiate_message);

console.log('client_challenge', client_challenge.toString('hex'));