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NTLM: AUTHENTICATE_MESSAGE: Do not include EncryptedRandomSessionKey if the appropriate flags are not set

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Tal Aloni 2017-09-01 18:54:41 +03:00
parent adcb576976
commit 0c49e6ec29
1 changed files with 5 additions and 2 deletions
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7
SMBLibrary/Authentication/NTLM/Structures/AuthenticateMessage.cs
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@ -59,13 +59,16 @@ namespace SMBLibrary.Authentication.NTLM
public byte[] GetBytes() public byte[] GetBytes()
{ {
int fixedLength = 64; if ((NegotiateFlags & NegotiateFlags.KeyExchange) == 0)
{
EncryptedRandomSessionKey = new byte[0];
}
int fixedLength = 64;
if ((NegotiateFlags & NegotiateFlags.Version) > 0) if ((NegotiateFlags & NegotiateFlags.Version) > 0)
{ {
fixedLength += NTLMVersion.Length; fixedLength += NTLMVersion.Length;
} }
int payloadLength = LmChallengeResponse.Length + NtChallengeResponse.Length + DomainName.Length * 2 + UserName.Length * 2 + WorkStation.Length * 2 + EncryptedRandomSessionKey.Length; int payloadLength = LmChallengeResponse.Length + NtChallengeResponse.Length + DomainName.Length * 2 + UserName.Length * 2 + WorkStation.Length * 2 + EncryptedRandomSessionKey.Length;
byte[] buffer = new byte[fixedLength + payloadLength]; byte[] buffer = new byte[fixedLength + payloadLength];
ByteWriter.WriteAnsiString(buffer, 0, ValidSignature, 8); ByteWriter.WriteAnsiString(buffer, 0, ValidSignature, 8);