/// <summary>
/// create negotiate request packet. client sends this packet to server to negotiate the dialects.
/// </summary>
/// <param name = "messageId">
/// This field SHOULD be the multiplex ID that is used to associate a response with a request, as specified in
/// [CIFS] sections 2.4.2 and 3.1.5.
/// </param>
/// <param name = "flags">
/// The Flags field contains individual flags, as specified in [CIFS] sections 2.4.2 and 3.1.1.
/// </param>
/// <param name = "flags2">
/// The Flags2 field contains individual bit flags that, depending on the negotiated SMB dialect, indicate
/// various client and server capabilities.
/// </param>
/// <param name = "dialects">
/// Array of null-terminated ASCII strings that indicate the SMB dialects supported by the client.
/// </param>
/// <returns>a smb negotiate packet. </returns>
private SmbNegotiateRequestPacket CreateNegotiateRequest(
ushort messageId,
SmbHeader_Flags_Values flags,
SmbHeader_Flags2_Values flags2,
params string[] dialects)
{
// update global context using flags2
this.capability.IsSupportsExtendedSecurity =
(flags2 & SmbHeader_Flags2_Values.SMB_FLAGS2_EXTENDED_SECURITY)
== SmbHeader_Flags2_Values.SMB_FLAGS2_EXTENDED_SECURITY;
this.capability.IsUnicode =
(flags2 & SmbHeader_Flags2_Values.SMB_FLAGS2_UNICODE)
== SmbHeader_Flags2_Values.SMB_FLAGS2_UNICODE;
this.capability.IsKnowEAS =
(flags2 & SmbHeader_Flags2_Values.SMB_FLAGS2_KNOWS_EAS)
== SmbHeader_Flags2_Values.SMB_FLAGS2_KNOWS_EAS;
// initialize the dialects
SMB_Dialect[] smbDialects = new SMB_Dialect[dialects.Length];
for (int i = 0; i < smbDialects.Length; i++)
{
SMB_Dialect dialect = new SMB_Dialect();
// Each string MUST be prefixed with ASCII code 0x02
dialect.BufferFormat = 0x02;
dialect.DialectString = dialects[i];
smbDialects[i] = dialect;
}
return new SmbNegotiateRequestPacket(
this.cifsClient.CreateNegotiateRequest(messageId, (SmbFlags)flags, (SmbFlags2)flags2, smbDialects));
}
/// <summary>
/// to create a Negotiate request packet.
/// </summary>
/// <param name="dialects">This is a variable length list of dialect identifiers in order of preference from
/// least to most preferred</param>
/// <returns>a Negotiate request packet</returns>
/// <exception cref="System.NullReferenceException">There is no connection in context. </exception>
public SmbNegotiateRequestPacket CreateNegotiateRequest(
SMB_Dialect[] dialects)
{
return this.CreateNegotiateRequest(this.Context.GetMessageId(this.connectionId),
this.defaultParameters.Flag, this.defaultParameters.Flag2, dialects);
}
/// <summary>
/// Set up connection with server.
/// Including 4 steps: 1. Tcp connection 2. Negotiation 3. SessionSetup 4. TreeConnect in order
/// </summary>
/// <param name="server">server name of ip address</param>
/// <param name="client">client name of ip address</param>
/// <param name="domain">user's domain</param>
/// <param name="userName">user's name</param>
/// <param name="password">user's password</param>
/// <param name="timeout">The pending time to get server's response in step 2, 3 or 4</param>
/// <exception cref="System.Net.ProtocolViolationException">Fail to set up connection with server</exception>
public override void Connect(
string server,
string client,
string domain,
string userName,
string password,
TimeSpan timeout,
SecurityPackageType securityPackage = SecurityPackageType.Ntlm,
bool useServerToken = false)
{
this.cifsClient.Connect(server, client);
SmbPacket request, response;
uint status;
// Negotiate:
SMB_Dialect dialectLM21 = new SMB_Dialect();
dialectLM21.BufferFormat = dialectBufferFormat;
dialectLM21.DialectString = dialectLanMan21;
SMB_Dialect dialectNTLM = new SMB_Dialect();
dialectNTLM.BufferFormat = dialectBufferFormat;
dialectNTLM.DialectString = dialectNtLanMan;
request = this.cifsClient.CreateNegotiateRequest(new SMB_Dialect[] { dialectLM21, dialectNTLM });
this.cifsClient.SendPacket(request);
response = this.cifsClient.ExpectPacket(timeout);
status = (response as SmbNegotiateResponsePacket).SmbHeader.Status;
if (status != 0)
{
throw new ProtocolViolationException("Negotiate Failed. ErrorCode: " + status);
}
// Session setup:
CifsUserAccount userAccount = new CifsUserAccount(domain, userName, password);
request = this.cifsClient.CreateSessionSetupRequest(userAccount, nativeOS, nativeLanMan);
this.cifsClient.SendPacket(request);
response = this.cifsClient.ExpectPacket(timeout);
SmbSessionSetupAndxResponsePacket sessionSetupResponse = response as SmbSessionSetupAndxResponsePacket;
status = sessionSetupResponse.SmbHeader.Status;
if (status != 0)
{
throw new ProtocolViolationException("Session Setup Failed. ErrorCode: " + status);
}
this.uid = sessionSetupResponse.SmbHeader.Uid;
// Tree connect:
string ipcAddress = "\\\\" + server + '\\' + ipcConnectString;
request = this.cifsClient.CreateTreeConnectAndxRequest(this.uid, TreeConnectAndxFlags.NONE,
ipcAddress, treeConnectService, null, null);
this.cifsClient.SendPacket(request);
response = this.cifsClient.ExpectPacket(timeout);
SmbTreeConnectAndxResponsePacket treeConnectResponse = response as SmbTreeConnectAndxResponsePacket;
status = treeConnectResponse.SmbHeader.Status;
if (status != 0)
{
throw new ProtocolViolationException("Tree Connect Failed. ErrorCode: " + status);
}
this.treeId = treeConnectResponse.SmbHeader.Tid;
}
/// <summary>
/// to create a Negotiate request packet.
/// </summary>
/// <param name="messageId">This field SHOULD be the multiplex ID that is used to associate a response with a
/// request.</param>
/// <param name="flags">An 8-bit field of 1-bit flags describing various features in effect for the
/// message</param>
/// <param name="flags2">A 16-bit field of 1-bit flags that represent various features in effect for the
/// message. Unspecified bits are reserved and MUST be zero.</param>
/// <param name="dialects">This is a variable length list of dialect identifiers in order of preference from
/// least to most preferred</param>
/// <returns>a Negotiate request packet</returns>
public SmbNegotiateRequestPacket CreateNegotiateRequest(
ushort messageId,
SmbFlags flags,
SmbFlags2 flags2,
SMB_Dialect[] dialects)
{
if (dialects == null)
{
dialects = new SMB_Dialect[0];
}
SmbNegotiateRequestPacket packet = new SmbNegotiateRequestPacket();
packet.SmbHeader = CifsMessageUtils.CreateSmbHeader(SmbCommand.SMB_COM_NEGOTIATE,
messageId, 0, 0, flags, flags2);
SMB_COM_NEGOTIATE_Request_SMB_Parameters smbParameters = new SMB_COM_NEGOTIATE_Request_SMB_Parameters();
smbParameters.WordCount = 0;
SMB_COM_NEGOTIATE_Request_SMB_Data smbData = new SMB_COM_NEGOTIATE_Request_SMB_Data();
List<byte> list = new List<byte>();
foreach (SMB_Dialect dialect in dialects)
{
list.Add(dialect.BufferFormat);
list.AddRange(CifsMessageUtils.ToSmbStringBytes(dialect.DialectString, false));
}
smbData.Dialects = list.ToArray();
smbData.ByteCount = (ushort)(smbData.Dialects.Length);
packet.SmbParameters = smbParameters;
packet.SmbData = smbData;
return packet;
}
