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SMB2Client: Support non-Microsoft servers returning MaxReadSize > MaxTransactSize

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Tal Aloni 2024-03-01 10:55:52 +02:00
parent 5dff3875b6
commit a9f9ef95e8
1 changed files with 7 additions and 4 deletions
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11
SMBLibrary/Client/SMB2Client.cs
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@ -1,4 +1,4 @@
/* Copyright (C) 2017-2023 Tal Aloni <tal.aloni.il@gmail.com>. All rights reserved.
/* Copyright (C) 2017-2024 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,
@ -481,9 +481,12 @@ namespace SMBLibrary.Client
NegotiateResponse negotiateResponse = (NegotiateResponse)command;
if ((negotiateResponse.Capabilities & Capabilities.LargeMTU) > 0)
{
// [MS-SMB2] 3.2.5.1 Receiving Any Message - If the message size received exceeds Connection.MaxTransactSize, the client MUST disconnect the connection.
// Note: Windows clients do not enforce the MaxTransactSize value, we add 256 bytes.
int maxPacketSize = SessionPacket.HeaderLength + (int)Math.Min(negotiateResponse.MaxTransactSize, ClientMaxTransactSize) + 256;
// [MS-SMB2] 3.2.5.1 Receiving Any Message - If the message size received exceeds Connection.MaxTransactSize, the client SHOULD disconnect the connection.
// Note: Windows clients do not enforce the MaxTransactSize value.
// We use a value that we have observed to work well with both Microsoft and non-Microsoft servers.
// see https://github.com/TalAloni/SMBLibrary/issues/239
int serverMaxTransactSize = (int)Math.Max(negotiateResponse.MaxTransactSize, negotiateResponse.MaxReadSize);
int maxPacketSize = SessionPacket.HeaderLength + (int)Math.Min(serverMaxTransactSize, ClientMaxTransactSize) + 256;
if (maxPacketSize > state.ReceiveBuffer.Buffer.Length)
{
state.ReceiveBuffer.IncreaseBufferSize(maxPacketSize);