private byte[] UserIdentificationData()
{
using (var result = new MemoryStream())
{
if (!string.IsNullOrEmpty(_userID))
{
_srp = new SrpClient();
var login = Encoding.UTF8.GetBytes(_userID);
result.WriteByte(IscCodes.CNCT_login);
result.WriteByte((byte)login.Length);
result.Write(login, 0, login.Length);
var pluginName = Encoding.ASCII.GetBytes(SrpClient.PluginName);
result.WriteByte(IscCodes.CNCT_plugin_name);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
result.WriteByte(IscCodes.CNCT_plugin_list);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
var specificData = Encoding.ASCII.GetBytes(_srp.PublicKeyHex);
WriteMultiPartHelper(result, IscCodes.CNCT_specific_data, specificData);
}
else
{
_sspi = new SspiHelper();
var pluginName = Encoding.ASCII.GetBytes(SspiHelper.PluginName);
result.WriteByte(IscCodes.CNCT_plugin_name);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
result.WriteByte(IscCodes.CNCT_plugin_list);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
var specificData = _sspi.InitializeClientSecurity();
WriteMultiPartHelper(result, IscCodes.CNCT_specific_data, specificData);
}
var user = Encoding.UTF8.GetBytes(Environment.GetEnvironmentVariable("USERNAME"));
result.WriteByte(IscCodes.CNCT_user);
result.WriteByte((byte)user.Length);
result.Write(user, 0, user.Length);
var host = Encoding.UTF8.GetBytes(Dns.GetHostName());
result.WriteByte(IscCodes.CNCT_host);
result.WriteByte((byte)host.Length);
result.Write(host, 0, host.Length);
result.WriteByte(IscCodes.CNCT_client_crypt);
result.WriteByte(4);
result.Write(new byte[] { 0, 0, 0, 0 }, 0, 4);
result.WriteByte(IscCodes.CNCT_user_verification);
result.WriteByte(0);
return(result.ToArray());
}
}
void ReleaseAuth()
{
_srp256 = null;
_srp = null;
_sspi?.Dispose();
_sspi = null;
}
public AuthBlock(string user, string password, WireCryptOption wireCrypt)
{
_srp256 = new Srp256Client();
_srp = new SrpClient();
_sspi = new SspiHelper();
User = user;
Password = password;
WireCrypt = wireCrypt;
}
public void Identify(string database)
{
using (var xdrStream = CreateXdrStreamImpl(false))
{
try
{
xdrStream.Write(IscCodes.op_connect);
xdrStream.Write(IscCodes.op_attach);
xdrStream.Write(IscCodes.CONNECT_VERSION3);
xdrStream.Write(IscCodes.GenericAchitectureClient);
xdrStream.Write(database);
var protocols = ProtocolsSupported.Get(_compression);
xdrStream.Write(protocols.Count());
xdrStream.WriteBuffer(UserIdentificationData());
var priority = 0;
foreach (var protocol in protocols)
{
xdrStream.Write(protocol.Version);
xdrStream.Write(IscCodes.GenericAchitectureClient);
xdrStream.Write(protocol.MinPType);
xdrStream.Write(protocol.MaxPType);
xdrStream.Write(priority);
priority++;
}
xdrStream.Flush();
var operation = xdrStream.ReadOperation();
if (operation == IscCodes.op_accept || operation == IscCodes.op_cond_accept || operation == IscCodes.op_accept_data)
{
_protocolVersion = xdrStream.ReadInt32();
_protocolArchitecture = xdrStream.ReadInt32();
_protocolMinimunType = xdrStream.ReadInt32();
if (_protocolVersion < 0)
{
_protocolVersion = (ushort)(_protocolVersion & IscCodes.FB_PROTOCOL_MASK) | IscCodes.FB_PROTOCOL_FLAG;
}
if (_compression && !((_protocolMinimunType & IscCodes.pflag_compress) != 0))
{
_compression = false;
}
if (operation == IscCodes.op_cond_accept || operation == IscCodes.op_accept_data)
{
var data = xdrStream.ReadBuffer();
var acceptPluginName = xdrStream.ReadString();
var isAuthenticated = xdrStream.ReadBoolean();
var keys = xdrStream.ReadString();
if (!isAuthenticated)
{
switch (acceptPluginName)
{
case SrpClient.PluginName:
_authData = Encoding.ASCII.GetBytes(_srp.ClientProof(NormalizeLogin(_userID), _password, data).ToHexString());
break;
case SspiHelper.PluginName:
_authData = _sspi.GetClientSecurity(data);
break;
default:
throw new ArgumentOutOfRangeException(nameof(acceptPluginName), $"{nameof(acceptPluginName)}={acceptPluginName}");
}
}
}
}
else if (operation == IscCodes.op_response)
{
var response = (GenericResponse)ProcessOperation(operation, xdrStream);
throw response.Exception;
}
else
{
try
{
Disconnect();
}
catch
{ }
finally
{
throw IscException.ForErrorCode(IscCodes.isc_connect_reject);
}
}
}
catch (IOException ex)
{
throw IscException.ForErrorCode(IscCodes.isc_network_error, ex);
}
finally
{
// UserIdentificationData might allocate these
_srp = null;
_sspi?.Dispose();
_sspi = null;
}
}
}
private byte[] UserIdentificationData(out SrpClient srp, out SspiHelper sspi)
{
srp = null;
sspi = null;
using (var result = new MemoryStream())
{
var userString = Environment.GetEnvironmentVariable("USERNAME") ?? Environment.GetEnvironmentVariable("USER") ?? string.Empty;
var user = Encoding.UTF8.GetBytes(userString);
result.WriteByte(IscCodes.CNCT_user);
result.WriteByte((byte)user.Length);
result.Write(user, 0, user.Length);
var host = Encoding.UTF8.GetBytes(Dns.GetHostName());
result.WriteByte(IscCodes.CNCT_host);
result.WriteByte((byte)host.Length);
result.Write(host, 0, host.Length);
result.WriteByte(IscCodes.CNCT_user_verification);
result.WriteByte(0);
if (!string.IsNullOrEmpty(_userID))
{
srp = new SrpClient();
var login = Encoding.UTF8.GetBytes(_userID);
result.WriteByte(IscCodes.CNCT_login);
result.WriteByte((byte)login.Length);
result.Write(login, 0, login.Length);
var pluginName = Encoding.ASCII.GetBytes(SrpClient.PluginName);
result.WriteByte(IscCodes.CNCT_plugin_name);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
result.WriteByte(IscCodes.CNCT_plugin_list);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
var specificData = Encoding.ASCII.GetBytes(srp.PublicKeyHex);
WriteMultiPartHelper(result, IscCodes.CNCT_specific_data, specificData);
result.WriteByte(IscCodes.CNCT_client_crypt);
result.WriteByte(4);
result.Write(TypeEncoder.EncodeInt32(WireCryptOptionValue(_wireCrypt)), 0, 4);
}
else
{
sspi = new SspiHelper();
var pluginName = Encoding.ASCII.GetBytes(SspiHelper.PluginName);
result.WriteByte(IscCodes.CNCT_plugin_name);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
result.WriteByte(IscCodes.CNCT_plugin_list);
result.WriteByte((byte)pluginName.Length);
result.Write(pluginName, 0, pluginName.Length);
var specificData = sspi.InitializeClientSecurity();
WriteMultiPartHelper(result, IscCodes.CNCT_specific_data, specificData);
result.WriteByte(IscCodes.CNCT_client_crypt);
result.WriteByte(4);
result.Write(TypeEncoder.EncodeInt32(IscCodes.WIRE_CRYPT_DISABLED), 0, 4);
}
return(result.ToArray());
}
}
