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NTLM: AuthenticateMessage: Added GetMicFieldOffset method and MicFieldLenght constant

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This commit is contained in:
Tal Aloni 2023-12-30 13:30:20 +02:00
parent ce6921cb03
commit a9f995c172
1 changed files with 15 additions and 4 deletions
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19
SMBLibrary/Authentication/NTLM/Structures/AuthenticateMessage.cs
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@ -1,12 +1,10 @@
/* Copyright (C) 2014-2020 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
/* Copyright (C) 2014-2023 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
*
* You can redistribute this program and/or modify it under the terms of
* the GNU Lesser Public License as published by the Free Software Foundation,
* either version 3 of the License, or (at your option) any later version.
*/
using System;
using System.Collections.Generic;
using System.Text;
using Utilities;
namespace SMBLibrary.Authentication.NTLM
@ -17,6 +15,7 @@ namespace SMBLibrary.Authentication.NTLM
public class AuthenticateMessage
{
public const string ValidSignature = "NTLMSSP\0";
public const int MicFieldLenght = 16;
public string Signature; // 8 bytes
public MessageTypeName MessageType;
@ -59,7 +58,7 @@ namespace SMBLibrary.Authentication.NTLM
}
if (HasMicField())
{
MIC = ByteReader.ReadBytes(buffer, offset, 16);
MIC = ByteReader.ReadBytes(buffer, offset, MicFieldLenght);
}
}
@ -142,5 +141,17 @@ namespace SMBLibrary.Authentication.NTLM
return buffer;
}
public static int GetMicFieldOffset(byte[] authenticateMessageBytes)
{
NegotiateFlags negotiateFlags = (NegotiateFlags)LittleEndianConverter.ToUInt32(authenticateMessageBytes, 60);
int offset = 64;
if ((negotiateFlags & NegotiateFlags.Version) > 0)
{
offset += NTLMVersion.Length;
}
return offset;
}
}
}