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TdsParser.cs
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TdsParser.cs
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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
using System;
using System.Buffers;
using System.Buffers.Binary;
using System.Collections.Generic;
using System.Data;
using System.Data.SqlTypes;
using System.Diagnostics;
using System.Globalization;
using System.IO;
using System.Security.Authentication;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Xml;
using Microsoft.Data.Common;
using Microsoft.Data.ProviderBase;
using Microsoft.Data.Sql;
using Microsoft.Data.SqlClient.DataClassification;
using Microsoft.Data.SqlClient.Server;
using Microsoft.Data.SqlTypes;
namespace Microsoft.Data.SqlClient
{
internal struct SNIErrorDetails
{
public string errorMessage;
public uint nativeError;
public uint sniErrorNumber;
public int provider;
public uint lineNumber;
public string function;
public Exception exception;
}
// The TdsParser Object controls reading/writing to the netlib, parsing the tds,
// and surfacing objects to the user.
internal sealed partial class TdsParser
{
internal struct ReliabilitySection
{
/// <summary>
/// This is a no-op in netcore version. Only needed for merging with netfx codebase.
/// </summary>
[Conditional("NETFRAMEWORK")]
internal static void Assert(string message)
{
}
}
private static int _objectTypeCount; // EventSource counter
private readonly SqlClientLogger _logger = new SqlClientLogger();
private SSPIContextProvider _authenticationProvider;
internal readonly int _objectID = Interlocked.Increment(ref _objectTypeCount);
internal int ObjectID => _objectID;
/// <summary>
/// Verify client encryption possibility.
/// </summary>
private bool ClientOSEncryptionSupport => TdsParserStateObjectFactory.Singleton.ClientOSEncryptionSupport;
// Default state object for parser
internal TdsParserStateObject _physicalStateObj = null; // Default stateObj and connection for Dbnetlib and non-MARS SNI.
// Also, default logical stateObj and connection for MARS over SNI.
internal TdsParserStateObject _pMarsPhysicalConObj = null; // With MARS enabled, cached physical stateObj and connection.
// Must keep this around - especially for callbacks on pre-MARS
// ReadAsync which will return if physical connection broken!
//
// Per Instance TDS Parser variables
//
// Constants
private const int constBinBufferSize = 4096; // Size of the buffer used to read input parameter of type Stream
private const int constTextBufferSize = 4096; // Size of the buffer (in chars) user to read input parameter of type TextReader
private const string enableTruncateSwitch = "Switch.Microsoft.Data.SqlClient.TruncateScaledDecimal"; // for applications that need to maintain backwards compatibility with the previous behavior
// State variables
internal TdsParserState _state = TdsParserState.Closed; // status flag for connection
private string _server = ""; // name of server that the parser connects to
internal volatile bool _fResetConnection = false; // flag to denote whether we are needing to call sp_reset
internal volatile bool _fPreserveTransaction = false; // flag to denote whether we need to preserve the transaction when reseting
private SqlCollation _defaultCollation; // default collation from the server
private int _defaultCodePage;
private int _defaultLCID;
internal Encoding _defaultEncoding = null; // for sql character data
private static EncryptionOptions s_sniSupportedEncryptionOption = TdsParserStateObjectFactory.Singleton.EncryptionOptions;
private EncryptionOptions _encryptionOption = s_sniSupportedEncryptionOption;
private SqlInternalTransaction _currentTransaction;
private SqlInternalTransaction _pendingTransaction; // pending transaction for 2005 and beyond.
// need to hold on to the transaction id if distributed transaction merely rolls back without defecting.
private long _retainedTransactionId = SqlInternalTransaction.NullTransactionId;
// This counter is used for the entire connection to track the open result count for all
// operations not under a transaction.
private int _nonTransactedOpenResultCount = 0;
// Connection reference
private SqlInternalConnectionTds _connHandler;
// Async/Mars variables
private bool _fMARS = false;
internal bool _loginWithFailover = false; // set to true while connect in failover mode so parser state object can adjust its logic
internal AutoResetEvent _resetConnectionEvent = null; // Used to serialize executes and call reset on first execute only.
internal TdsParserSessionPool _sessionPool = null; // initialized only when we're a MARS parser.
// Version variables
private bool _is2005 = false; // set to true if speaking to 2005 or later
private bool _is2008 = false;
private bool _is2012 = false;
private bool _is2022 = false;
private string[] _sniSpn = null;
// SqlStatistics
private SqlStatistics _statistics = null;
private bool _statisticsIsInTransaction = false;
//
// STATIC TDS Parser variables
//
// NIC address caching
private static byte[] s_nicAddress; // cache the NIC address from the registry
// textptr sequence
private static readonly byte[] s_longDataHeader = { 0x10, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
// XML metadata substitute sequence
private static readonly byte[] s_xmlMetadataSubstituteSequence = { 0xe7, 0xff, 0xff, 0x00, 0x00, 0x00, 0x00, 0x00 };
// size of Guid (e.g. _clientConnectionId, ActivityId.Id)
private const int GUID_SIZE = 16;
// NOTE: You must take the internal connection's _parserLock before modifying this
internal bool _asyncWrite = false;
/// <summary>
/// Get or set if column encryption is supported by the server.
/// </summary>
internal bool IsColumnEncryptionSupported { get; set; } = false;
/// <summary>
/// TCE version supported by the server
/// </summary>
internal byte TceVersionSupported { get; set; }
/// <summary>
/// Server supports retrying when the enclave CEKs sent by the client do not match what is needed for the query to run.
/// </summary>
internal bool AreEnclaveRetriesSupported { get; set; }
/// <summary>
/// Type of enclave being used by the server
/// </summary>
internal string EnclaveType { get; set; }
internal bool isTcpProtocol { get; set; }
internal string FQDNforDNSCache { get; set; }
/// <summary>
/// Get if data classification is enabled by the server.
/// </summary>
internal bool IsDataClassificationEnabled =>
(DataClassificationVersion != TdsEnums.DATA_CLASSIFICATION_NOT_ENABLED);
/// <summary>
/// Get or set data classification version. A value of 0 means that sensitivity classification is not enabled.
/// </summary>
internal int DataClassificationVersion { get; set; }
private SqlCollation _cachedCollation;
internal TdsParser(bool MARS, bool fAsynchronous)
{
_fMARS = MARS; // may change during Connect to pre 2005 servers
_physicalStateObj = TdsParserStateObjectFactory.Singleton.CreateTdsParserStateObject(this);
DataClassificationVersion = TdsEnums.DATA_CLASSIFICATION_NOT_ENABLED;
}
internal SqlInternalConnectionTds Connection
{
get
{
return _connHandler;
}
}
private static bool EnableTruncateSwitch
{
get
{
bool value;
value = AppContext.TryGetSwitch(enableTruncateSwitch, out value) ? value : false;
return value;
}
}
internal SqlInternalTransaction CurrentTransaction
{
get
{
return _currentTransaction;
}
set
{
Debug.Assert(value == _currentTransaction
|| null == _currentTransaction
|| null == value
|| (null != _currentTransaction && !_currentTransaction.IsLocal), "attempting to change current transaction?");
// If there is currently a transaction active, we don't want to
// change it; this can occur when there is a delegated transaction
// and the user attempts to do an API begin transaction; in these
// cases, it's safe to ignore the set.
if ((null == _currentTransaction && null != value)
|| (null != _currentTransaction && null == value))
{
_currentTransaction = value;
}
}
}
internal int DefaultLCID
{
get
{
return _defaultLCID;
}
}
internal EncryptionOptions EncryptionOptions
{
get
{
return _encryptionOption;
}
set
{
_encryptionOption = value;
}
}
internal bool Is2005OrNewer => true;
internal bool Is2008OrNewer
{
get
{
return _is2008;
}
}
internal bool MARSOn
{
get
{
return _fMARS;
}
}
internal SqlInternalTransaction PendingTransaction
{
get
{
return _pendingTransaction;
}
set
{
Debug.Assert(null != value, "setting a non-null PendingTransaction?");
_pendingTransaction = value;
}
}
internal string Server
{
get
{
return _server;
}
}
internal TdsParserState State
{
get
{
return _state;
}
set
{
_state = value;
}
}
internal SqlStatistics Statistics
{
get
{
return _statistics;
}
set
{
_statistics = value;
}
}
private bool IncludeTraceHeader
{
get
{
return (_is2012 && SqlClientEventSource.Log.IsEnabled());
}
}
internal int IncrementNonTransactedOpenResultCount()
{
// IMPORTANT - this increments the connection wide open result count for all
// operations not under a transaction! Do not call if you intend to modify the
// count for a transaction!
Debug.Assert(_nonTransactedOpenResultCount >= 0, "Unexpected result count state");
int result = Interlocked.Increment(ref _nonTransactedOpenResultCount);
return result;
}
internal void DecrementNonTransactedOpenResultCount()
{
// IMPORTANT - this decrements the connection wide open result count for all
// operations not under a transaction! Do not call if you intend to modify the
// count for a transaction!
Interlocked.Decrement(ref _nonTransactedOpenResultCount);
Debug.Assert(_nonTransactedOpenResultCount >= 0, "Unexpected result count state");
}
internal void ProcessPendingAck(TdsParserStateObject stateObj)
{
if (stateObj._attentionSent)
{
SqlClientEventSource.Log.TryTraceEvent("TdsParser.ProcessPendingAck | INFO | Connection Object Id {0}, State Obj Id {1}, Processing Attention.", _connHandler._objectID, stateObj.ObjectID);
ProcessAttention(stateObj);
}
}
internal void Connect(
ServerInfo serverInfo,
SqlInternalConnectionTds connHandler,
TimeoutTimer timeout,
SqlConnectionString connectionOptions,
bool withFailover)
{
SqlConnectionEncryptOption encrypt = connectionOptions.Encrypt;
bool isTlsFirst = (encrypt == SqlConnectionEncryptOption.Strict);
bool trustServerCert = connectionOptions.TrustServerCertificate;
bool integratedSecurity = connectionOptions.IntegratedSecurity;
SqlAuthenticationMethod authType = connectionOptions.Authentication;
string hostNameInCertificate = connectionOptions.HostNameInCertificate;
string serverCertificateFilename = connectionOptions.ServerCertificate;
if (_state != TdsParserState.Closed)
{
Debug.Fail("TdsParser.Connect called on non-closed connection!");
return;
}
_connHandler = connHandler;
_loginWithFailover = withFailover;
// Clean up IsSQLDNSCachingSupported flag from previous status
_connHandler.IsSQLDNSCachingSupported = false;
uint sniStatus = TdsParserStateObjectFactory.Singleton.SNIStatus;
if (sniStatus != TdsEnums.SNI_SUCCESS)
{
_physicalStateObj.AddError(ProcessSNIError(_physicalStateObj));
_physicalStateObj.Dispose();
ThrowExceptionAndWarning(_physicalStateObj);
Debug.Fail("SNI returned status != success, but no error thrown?");
}
else
{
_sniSpn = null;
SqlClientEventSource.Log.TryTraceEvent("TdsParser.Connect | SEC | Connection Object Id {0}, Authentication Mode: {1}", _connHandler._objectID,
authType == SqlAuthenticationMethod.NotSpecified ? SqlAuthenticationMethod.SqlPassword.ToString() : authType.ToString());
}
// Encryption is not supported on SQL Local DB - disable it if they have only specified Mandatory
if (connHandler.ConnectionOptions.LocalDBInstance != null && encrypt == SqlConnectionEncryptOption.Mandatory)
{
encrypt = SqlConnectionEncryptOption.Optional;
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|SEC> Encryption will be disabled as target server is a SQL Local DB instance.");
}
_sniSpn = null;
_authenticationProvider = null;
// AD Integrated behaves like Windows integrated when connecting to a non-fedAuth server
if (integratedSecurity || authType == SqlAuthenticationMethod.ActiveDirectoryIntegrated)
{
_authenticationProvider = _physicalStateObj.CreateSSPIContextProvider();
SqlClientEventSource.Log.TryTraceEvent("TdsParser.Connect | SEC | SSPI or Active Directory Authentication Library loaded for SQL Server based integrated authentication");
}
// if Strict encryption (i.e. isTlsFirst) is chosen trust server certificate should always be false.
if (isTlsFirst)
{
trustServerCert = false;
}
byte[] instanceName = null;
Debug.Assert(_connHandler != null, "SqlConnectionInternalTds handler can not be null at this point.");
_connHandler.TimeoutErrorInternal.EndPhase(SqlConnectionTimeoutErrorPhase.PreLoginBegin);
_connHandler.TimeoutErrorInternal.SetAndBeginPhase(SqlConnectionTimeoutErrorPhase.InitializeConnection);
bool fParallel = _connHandler.ConnectionOptions.MultiSubnetFailover;
FQDNforDNSCache = serverInfo.ResolvedServerName;
int commaPos = FQDNforDNSCache.IndexOf(",", StringComparison.Ordinal);
if (commaPos != -1)
{
FQDNforDNSCache = FQDNforDNSCache.Substring(0, commaPos);
}
_connHandler.pendingSQLDNSObject = null;
// AD Integrated behaves like Windows integrated when connecting to a non-fedAuth server
_physicalStateObj.CreatePhysicalSNIHandle(
serverInfo.ExtendedServerName,
timeout,
out instanceName,
ref _sniSpn,
false,
true,
fParallel,
_connHandler.ConnectionOptions.IPAddressPreference,
FQDNforDNSCache,
ref _connHandler.pendingSQLDNSObject,
serverInfo.ServerSPN,
integratedSecurity || authType == SqlAuthenticationMethod.ActiveDirectoryIntegrated,
isTlsFirst,
hostNameInCertificate,
serverCertificateFilename);
_authenticationProvider?.Initialize(serverInfo, _physicalStateObj, this, _sniSpn);
if (TdsEnums.SNI_SUCCESS != _physicalStateObj.Status)
{
_physicalStateObj.AddError(ProcessSNIError(_physicalStateObj));
// Since connect failed, free the unmanaged connection memory.
// HOWEVER - only free this after the netlib error was processed - if you
// don't, the memory for the connection object might not be accurate and thus
// a bad error could be returned (as it was when it was freed to early for me).
_physicalStateObj.Dispose();
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|ERR|SEC> Login failure");
ThrowExceptionAndWarning(_physicalStateObj);
Debug.Fail("SNI returned status != success, but no error thrown?");
}
_server = serverInfo.ResolvedServerName;
if (null != connHandler.PoolGroupProviderInfo)
{
// If we are pooling, check to see if we were processing an
// alias which has changed, which means we need to clean out
// the pool. See Webdata 104293.
// This should not apply to routing, as it is not an alias change, routed connection
// should still use VNN of AlwaysOn cluster as server for pooling purposes.
connHandler.PoolGroupProviderInfo.AliasCheck(serverInfo.PreRoutingServerName == null ?
serverInfo.ResolvedServerName : serverInfo.PreRoutingServerName);
}
_state = TdsParserState.OpenNotLoggedIn;
_physicalStateObj.SniContext = SniContext.Snix_PreLoginBeforeSuccessfulWrite;
_physicalStateObj.TimeoutTime = timeout.LegacyTimerExpire;
bool marsCapable = false;
_connHandler.TimeoutErrorInternal.EndPhase(SqlConnectionTimeoutErrorPhase.InitializeConnection);
_connHandler.TimeoutErrorInternal.SetAndBeginPhase(SqlConnectionTimeoutErrorPhase.SendPreLoginHandshake);
uint result = _physicalStateObj.SniGetConnectionId(ref _connHandler._clientConnectionId);
Debug.Assert(result == TdsEnums.SNI_SUCCESS, "Unexpected failure state upon calling SniGetConnectionId");
if (null == _connHandler.pendingSQLDNSObject)
{
// for DNS Caching phase 1
_physicalStateObj.AssignPendingDNSInfo(serverInfo.UserProtocol, FQDNforDNSCache, ref _connHandler.pendingSQLDNSObject);
}
if (!ClientOSEncryptionSupport)
{
//If encryption is required, an error will be thrown.
if (encrypt != SqlConnectionEncryptOption.Optional)
{
_physicalStateObj.AddError(new SqlError(TdsEnums.ENCRYPTION_NOT_SUPPORTED, (byte)0x00, TdsEnums.FATAL_ERROR_CLASS, _server, SQLMessage.EncryptionNotSupportedByClient(), "", 0));
_physicalStateObj.Dispose();
ThrowExceptionAndWarning(_physicalStateObj);
}
_encryptionOption = EncryptionOptions.NOT_SUP;
}
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|SEC> Sending prelogin handshake");
SendPreLoginHandshake(instanceName, encrypt, integratedSecurity, serverCertificateFilename);
_connHandler.TimeoutErrorInternal.EndPhase(SqlConnectionTimeoutErrorPhase.SendPreLoginHandshake);
_connHandler.TimeoutErrorInternal.SetAndBeginPhase(SqlConnectionTimeoutErrorPhase.ConsumePreLoginHandshake);
_physicalStateObj.SniContext = SniContext.Snix_PreLogin;
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|SEC> Consuming prelogin handshake");
PreLoginHandshakeStatus status = ConsumePreLoginHandshake(
encrypt,
trustServerCert,
integratedSecurity,
out marsCapable,
out _connHandler._fedAuthRequired,
isTlsFirst,
serverCertificateFilename);
if (status == PreLoginHandshakeStatus.InstanceFailure)
{
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|SEC> Prelogin handshake unsuccessful. Reattempting prelogin handshake");
_physicalStateObj.Dispose(); // Close previous connection
// On Instance failure re-connect and flush SNI named instance cache.
_physicalStateObj.SniContext = SniContext.Snix_Connect;
_physicalStateObj.CreatePhysicalSNIHandle(
serverInfo.ExtendedServerName,
timeout, out instanceName,
ref _sniSpn,
true,
true,
fParallel,
_connHandler.ConnectionOptions.IPAddressPreference,
FQDNforDNSCache,
ref _connHandler.pendingSQLDNSObject,
serverInfo.ServerSPN,
integratedSecurity,
isTlsFirst,
hostNameInCertificate,
serverCertificateFilename);
if (TdsEnums.SNI_SUCCESS != _physicalStateObj.Status)
{
_physicalStateObj.AddError(ProcessSNIError(_physicalStateObj));
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|ERR|SEC> Login failure");
ThrowExceptionAndWarning(_physicalStateObj);
}
_authenticationProvider?.Initialize(serverInfo, _physicalStateObj, this, _sniSpn);
uint retCode = _physicalStateObj.SniGetConnectionId(ref _connHandler._clientConnectionId);
Debug.Assert(retCode == TdsEnums.SNI_SUCCESS, "Unexpected failure state upon calling SniGetConnectionId");
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|SEC> Sending prelogin handshake");
if (null == _connHandler.pendingSQLDNSObject)
{
// for DNS Caching phase 1
_physicalStateObj.AssignPendingDNSInfo(serverInfo.UserProtocol, FQDNforDNSCache, ref _connHandler.pendingSQLDNSObject);
}
SendPreLoginHandshake(instanceName, encrypt, integratedSecurity, serverCertificateFilename);
status = ConsumePreLoginHandshake(
encrypt,
trustServerCert,
integratedSecurity,
out marsCapable,
out _connHandler._fedAuthRequired,
isTlsFirst,
serverCertificateFilename);
// Don't need to check for 7.0 failure, since we've already consumed
// one pre-login packet and know we are connecting to 2000.
if (status == PreLoginHandshakeStatus.InstanceFailure)
{
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|ERR|SEC> Prelogin handshake unsuccessful. Login failure");
throw SQL.InstanceFailure();
}
}
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.Connect|SEC> Prelogin handshake successful");
if (_fMARS && marsCapable)
{
// if user explicitly disables mars or mars not supported, don't create the session pool
_sessionPool = new TdsParserSessionPool(this);
}
else
{
_fMARS = false;
}
return;
}
internal void RemoveEncryption()
{
Debug.Assert(_encryptionOption == EncryptionOptions.LOGIN, "Invalid encryption option state");
uint error = _physicalStateObj.DisableSsl();
if (error != TdsEnums.SNI_SUCCESS)
{
_physicalStateObj.AddError(ProcessSNIError(_physicalStateObj));
ThrowExceptionAndWarning(_physicalStateObj);
}
// create a new packet encryption changes the internal packet size
_physicalStateObj.ClearAllWritePackets();
}
internal void EnableMars()
{
if (_fMARS)
{
// Cache physical stateObj and connection.
_pMarsPhysicalConObj = _physicalStateObj;
if (TdsParserStateObjectFactory.UseManagedSNI)
_pMarsPhysicalConObj.IncrementPendingCallbacks();
uint info = 0;
uint error = _pMarsPhysicalConObj.EnableMars(ref info);
if (error != TdsEnums.SNI_SUCCESS)
{
_physicalStateObj.AddError(ProcessSNIError(_physicalStateObj));
ThrowExceptionAndWarning(_physicalStateObj);
}
PostReadAsyncForMars();
_physicalStateObj = CreateSession(); // Create and open default MARS stateObj and connection.
}
}
internal TdsParserStateObject CreateSession()
{
TdsParserStateObject session = TdsParserStateObjectFactory.Singleton.CreateSessionObject(this, _pMarsPhysicalConObj, true);
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.TdsParser.CreateSession|ADV> {0} created session {1}", ObjectID, session.ObjectID);
return session;
}
internal TdsParserStateObject GetSession(object owner)
{
TdsParserStateObject session = null;
if (MARSOn)
{
session = _sessionPool.GetSession(owner);
Debug.Assert(!session.HasPendingData, "pending data on a pooled MARS session");
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.TdsParser.GetSession|ADV> {0} getting session {1} from pool", ObjectID, session.ObjectID);
}
else
{
session = _physicalStateObj;
SqlClientEventSource.Log.TryAdvancedTraceEvent("<sc.TdsParser.GetSession|ADV> {0} getting physical session {1}", ObjectID, session.ObjectID);
}
Debug.Assert(session._outputPacketNumber == 1, "The packet number is expected to be 1");
return session;
}
internal void PutSession(TdsParserStateObject session)
{
session.AssertStateIsClean();
if (MARSOn)
{
// This will take care of disposing if the parser is closed
_sessionPool.PutSession(session);
}
else if ((_state == TdsParserState.Closed) || (_state == TdsParserState.Broken))
{
// Parser is closed\broken - dispose the stateObj
Debug.Assert(session == _physicalStateObj, "MARS is off, but session to close is not the _physicalStateObj");
_physicalStateObj.SniContext = SniContext.Snix_Close;
#if DEBUG
_physicalStateObj.InvalidateDebugOnlyCopyOfSniContext();
#endif
_physicalStateObj.Dispose();
}
else
{
// Non-MARS, and session is ok - remove its owner
_physicalStateObj.Owner = null;
}
}
private void SendPreLoginHandshake(
byte[] instanceName,
SqlConnectionEncryptOption encrypt,
bool integratedSecurity,
string serverCertificateFilename)
{
if (encrypt == SqlConnectionEncryptOption.Strict)
{
//Always validate the certificate when in strict encryption mode
uint info = TdsEnums.SNI_SSL_VALIDATE_CERTIFICATE | TdsEnums.SNI_SSL_USE_SCHANNEL_CACHE | TdsEnums.SNI_SSL_SEND_ALPN_EXTENSION;
EnableSsl(info, encrypt, integratedSecurity, serverCertificateFilename);
// Since encryption has already been negotiated, we need to set encryption not supported in
// prelogin so that we don't try to negotiate encryption again during ConsumePreLoginHandshake.
_encryptionOption = EncryptionOptions.NOT_SUP;
}
// PreLoginHandshake buffer consists of:
// 1) Standard header, with type = MT_PRELOGIN
// 2) Consecutive 5 bytes for each option, (1 byte length, 2 byte offset, 2 byte payload length)
// 3) Consecutive data blocks for each option
// NOTE: packet data needs to be big endian - not the standard little endian used by
// the rest of the parser.
_physicalStateObj._outputMessageType = TdsEnums.MT_PRELOGIN;
// Initialize option offset into payload buffer
// 5 bytes for each option (1 byte length, 2 byte offset, 2 byte payload length)
int offset = (int)PreLoginOptions.NUMOPT * 5 + 1;
byte[] payload = new byte[(int)PreLoginOptions.NUMOPT * 5 + TdsEnums.MAX_PRELOGIN_PAYLOAD_LENGTH];
int payloadLength = 0;
for (int option = (int)PreLoginOptions.VERSION; option < (int)PreLoginOptions.NUMOPT; option++)
{
int optionDataSize = 0;
// Fill in the option
_physicalStateObj.WriteByte((byte)option);
// Fill in the offset of the option data
_physicalStateObj.WriteByte((byte)((offset & 0xff00) >> 8)); // send upper order byte
_physicalStateObj.WriteByte((byte)(offset & 0x00ff)); // send lower order byte
switch (option)
{
case (int)PreLoginOptions.VERSION:
Version systemDataVersion = ADP.GetAssemblyVersion();
// Major and minor
payload[payloadLength++] = (byte)(systemDataVersion.Major & 0xff);
payload[payloadLength++] = (byte)(systemDataVersion.Minor & 0xff);
// Build (Big Endian)
payload[payloadLength++] = (byte)((systemDataVersion.Build & 0xff00) >> 8);
payload[payloadLength++] = (byte)(systemDataVersion.Build & 0xff);
// Sub-build (Little Endian)
payload[payloadLength++] = (byte)(systemDataVersion.Revision & 0xff);
payload[payloadLength++] = (byte)((systemDataVersion.Revision & 0xff00) >> 8);
offset += 6;
optionDataSize = 6;
break;
case (int)PreLoginOptions.ENCRYPT:
if (_encryptionOption == EncryptionOptions.NOT_SUP)
{
//If OS doesn't support encryption and encryption is not required, inform server "not supported" by client.
payload[payloadLength] = (byte)EncryptionOptions.NOT_SUP;
}
else
{
// Else, inform server of user request.
if (encrypt == SqlConnectionEncryptOption.Mandatory)
{
payload[payloadLength] = (byte)EncryptionOptions.ON;
_encryptionOption = EncryptionOptions.ON;
}
else
{
payload[payloadLength] = (byte)EncryptionOptions.OFF;
_encryptionOption = EncryptionOptions.OFF;
}
}
payloadLength += 1;
offset += 1;
optionDataSize = 1;
break;
case (int)PreLoginOptions.INSTANCE:
int i = 0;
while (instanceName[i] != 0)
{
payload[payloadLength] = instanceName[i];
payloadLength++;
i++;
}
payload[payloadLength] = 0; // null terminate
payloadLength++;
i++;
offset += i;
optionDataSize = i;
break;
case (int)PreLoginOptions.THREADID:
int threadID = TdsParserStaticMethods.GetCurrentThreadIdForTdsLoginOnly();
payload[payloadLength++] = (byte)((0xff000000 & threadID) >> 24);
payload[payloadLength++] = (byte)((0x00ff0000 & threadID) >> 16);
payload[payloadLength++] = (byte)((0x0000ff00 & threadID) >> 8);
payload[payloadLength++] = (byte)(0x000000ff & threadID);
offset += 4;
optionDataSize = 4;
break;
case (int)PreLoginOptions.MARS:
payload[payloadLength++] = (byte)(_fMARS ? 1 : 0);
offset += 1;
optionDataSize += 1;
break;
case (int)PreLoginOptions.TRACEID:
FillGuidBytes(_connHandler._clientConnectionId, payload.AsSpan(payloadLength, GUID_SIZE));
payloadLength += GUID_SIZE;
offset += GUID_SIZE;
optionDataSize = GUID_SIZE;
ActivityCorrelator.ActivityId actId = ActivityCorrelator.Next();
FillGuidBytes(actId.Id, payload.AsSpan(payloadLength, GUID_SIZE));
payloadLength += GUID_SIZE;
payload[payloadLength++] = (byte)(0x000000ff & actId.Sequence);
payload[payloadLength++] = (byte)((0x0000ff00 & actId.Sequence) >> 8);
payload[payloadLength++] = (byte)((0x00ff0000 & actId.Sequence) >> 16);
payload[payloadLength++] = (byte)((0xff000000 & actId.Sequence) >> 24);
int actIdSize = GUID_SIZE + sizeof(uint);
offset += actIdSize;
optionDataSize += actIdSize;
SqlClientEventSource.Log.TryTraceEvent("<sc.TdsParser.SendPreLoginHandshake|INFO> ClientConnectionID {0}, ActivityID {1}", _connHandler?._clientConnectionId, actId);
break;
case (int)PreLoginOptions.FEDAUTHREQUIRED:
payload[payloadLength++] = 0x01;
offset += 1;
optionDataSize += 1;
break;
default:
Debug.Fail("UNKNOWN option in SendPreLoginHandshake");
break;
}
// Write data length
_physicalStateObj.WriteByte((byte)((optionDataSize & 0xff00) >> 8));
_physicalStateObj.WriteByte((byte)(optionDataSize & 0x00ff));
}
// Write out last option - to let server know the second part of packet completed
_physicalStateObj.WriteByte((byte)PreLoginOptions.LASTOPT);
// Write out payload
_physicalStateObj.WriteByteArray(payload, payloadLength, 0);
// Flush packet
_physicalStateObj.WritePacket(TdsEnums.HARDFLUSH);
}
private void EnableSsl(uint info, SqlConnectionEncryptOption encrypt, bool integratedSecurity, string serverCertificateFilename)
{
uint error = 0;
if (encrypt && !integratedSecurity)
{
// optimization: in case of SQL Authentication and encryption in TDS, set SNI_SSL_IGNORE_CHANNEL_BINDINGS
// to let SNI know that it does not need to allocate/retrieve the Channel Bindings from the SSL context.
// This applies to Native SNI
info |= TdsEnums.SNI_SSL_IGNORE_CHANNEL_BINDINGS;
}
error = _physicalStateObj.EnableSsl(ref info, encrypt == SqlConnectionEncryptOption.Strict, serverCertificateFilename);
if (error != TdsEnums.SNI_SUCCESS)
{
_physicalStateObj.AddError(ProcessSNIError(_physicalStateObj));
ThrowExceptionAndWarning(_physicalStateObj);
}
int protocolVersion = 0;
WaitForSSLHandShakeToComplete(ref error, ref protocolVersion);
SslProtocols protocol = (SslProtocols)protocolVersion;
string warningMessage = protocol.GetProtocolWarning();
if (!string.IsNullOrEmpty(warningMessage))
{
if (!encrypt && LocalAppContextSwitches.SuppressInsecureTLSWarning)
{
// Skip console warning
SqlClientEventSource.Log.TryTraceEvent("<sc|{0}|{1}|{2}>{3}", nameof(TdsParser), nameof(EnableSsl), SqlClientLogger.LogLevel.Warning, warningMessage);
}
else
{
// This logs console warning of insecure protocol in use.
_logger.LogWarning(nameof(TdsParser), nameof(EnableSsl), warningMessage);
}
}
// create a new packet encryption changes the internal packet size
_physicalStateObj.ClearAllWritePackets();
}
private PreLoginHandshakeStatus ConsumePreLoginHandshake(
SqlConnectionEncryptOption encrypt,
bool trustServerCert,
bool integratedSecurity,
out bool marsCapable,
out bool fedAuthRequired,
bool tlsFirst,
string serverCert)
{
marsCapable = _fMARS; // Assign default value
fedAuthRequired = false;
bool is2005OrLater = false;
Debug.Assert(_physicalStateObj._syncOverAsync, "Should not attempt pends in a synchronous call");
bool result = _physicalStateObj.TryReadNetworkPacket();
if (!result)
{
throw SQL.SynchronousCallMayNotPend();
}
if (_physicalStateObj._inBytesRead == 0)
{
// If the server did not respond then something has gone wrong and we need to close the connection
_physicalStateObj.AddError(new SqlError(0, (byte)0x00, TdsEnums.FATAL_ERROR_CLASS, _server, SQLMessage.PreloginError(), "", 0));
_physicalStateObj.Dispose();
ThrowExceptionAndWarning(_physicalStateObj);
}
if (!_physicalStateObj.TryProcessHeader())
{
throw SQL.SynchronousCallMayNotPend();
}
if (_physicalStateObj._inBytesPacket > TdsEnums.MAX_PACKET_SIZE || _physicalStateObj._inBytesPacket <= 0)
{
throw SQL.ParsingError();
}
byte[] payload = new byte[_physicalStateObj._inBytesPacket];
Debug.Assert(_physicalStateObj._syncOverAsync, "Should not attempt pends in a synchronous call");
result = _physicalStateObj.TryReadByteArray(payload, payload.Length);
if (!result)
{
throw SQL.SynchronousCallMayNotPend();
}
if (payload[0] == 0xaa)
{
// If the first byte is 0xAA, we are connecting to a 6.5 or earlier server, which
// is not supported.
throw SQL.InvalidSQLServerVersionUnknown();
}
int offset = 0;
int payloadOffset = 0;
int payloadLength = 0;
int option = payload[offset++];
bool serverSupportsEncryption = false;
while (option != (byte)PreLoginOptions.LASTOPT)
{
switch (option)
{
case (int)PreLoginOptions.VERSION:
payloadOffset = payload[offset++] << 8 | payload[offset++];
payloadLength = payload[offset++] << 8 | payload[offset++];
byte majorVersion = payload[payloadOffset];
byte minorVersion = payload[payloadOffset + 1];
int level = (payload[payloadOffset + 2] << 8) |
payload[payloadOffset + 3];