Search
Module:
Directory

   Desktop Functions:

   Smart Device Functions:


Show Recent Changes
Subscribe (RSS)
Misc. Pages
Comments
FAQ
Helpful Tools
Playground
Suggested Reading
Website TODO List
Support Forum
Download Visual Studio Add-In

Terms of Use
Privacy Policy
InitializeSecurityContext (secur32)
 
.
Summary
TODO - a short description

C# Signature:

[DllImport("secur32.dll", SetLastError=true)]
static extern int InitializeSecurityContext(ref SECURITY_HANDLE phCredential,//PCredHandle
    IntPtr phContext, //PCtxtHandle
    string pszTargetName,
    int fContextReq,
    int Reserved1,
    int TargetDataRep,
    IntPtr pInput, //PSecBufferDesc SecBufferDesc
    int Reserved2,
    out SECURITY_HANDLE phNewContext, //PCtxtHandle
    out SecBufferDesc pOutput, //PSecBufferDesc SecBufferDesc
    out uint pfContextAttr, //managed ulong == 64 bits!!!
    out SECURITY_INTEGER ptsExpiry); //PTimeStamp

VB Signature:

<DllImport("secur32", CharSet:=CharSet.Auto, SetLastError:=True)> _
Private Shared Function InitializeSecurityContext(ByRef phCredential As SECURITY_HANDLE, _
    ByVal phContext As IntPtr, _
    ByVal pszTargetName As String, _
    ByVal fContextReq As Integer, _
    ByVal Reserved1 As Integer, _
    ByVal TargetDataRep As Integer, _
    ByVal pInput As IntPtr, _
    ByVal Reserved2 As Integer, _
    ByRef phNewContext As SECURITY_HANDLE, _
    ByRef pOutput As SecBufferDesc, _
    ByRef pfContextAttr As UInteger, _
    ByRef ptsExpiry As SECURITY_INTEGER) As Integer
End Function

User-Defined Types:

None.

Notes:

Check out complete program below....

Contributed by http://dotnetjunkies.com/weblog/dotnetruminator

Tips & Tricks:

Please add some!

Sample Code:

#region Using directives

using System;
using System.Text;

#endregion

using System.Collections;
using System.Security.Principal;
using System.Diagnostics;
using System.Runtime.InteropServices;
using System.Net.Sockets;
using TestMe;

using HANDLE = System.IntPtr;

public enum SecBufferType
{
    SECBUFFER_VERSION = 0,
    SECBUFFER_EMPTY = 0,
    SECBUFFER_DATA = 1,
    SECBUFFER_TOKEN = 2
}

[StructLayout(LayoutKind.Sequential)]
public struct SecHandle //=PCtxtHandle
{
    IntPtr dwLower; // ULONG_PTR translates to IntPtr not to uint
    IntPtr dwUpper; // this is crucial for 64-Bit Platforms
}

[StructLayout(LayoutKind.Sequential)]
public struct SecBuffer :  IDisposable
{
    public int cbBuffer;
    public int BufferType;
    public IntPtr pvBuffer;


    public SecBuffer(int bufferSize)
    {
    cbBuffer = bufferSize;
    BufferType = (int)SecBufferType.SECBUFFER_TOKEN;
    pvBuffer = Marshal.AllocHGlobal(bufferSize);
    }

    public SecBuffer(byte[] secBufferBytes)
    {
        cbBuffer = secBufferBytes.Length;
        BufferType = (int)SecBufferType.SECBUFFER_TOKEN;
        pvBuffer = Marshal.AllocHGlobal(cbBuffer);
        Marshal.Copy(secBufferBytes,0,pvBuffer,cbBuffer);
    }

    public SecBuffer(byte[] secBufferBytes,SecBufferType bufferType)
    {
        cbBuffer = secBufferBytes.Length;
        BufferType = (int)bufferType;
        pvBuffer = Marshal.AllocHGlobal(cbBuffer);
        Marshal.Copy(secBufferBytes,0,pvBuffer,cbBuffer);
    }

    public void Dispose()
    {
        if(pvBuffer != IntPtr.Zero)
        {
            Marshal.FreeHGlobal(pvBuffer);
            pvBuffer = IntPtr.Zero;
        }
    }
}

public struct MultipleSecBufferHelper
{
    public byte[] Buffer;
    public SecBufferType BufferType;

    public MultipleSecBufferHelper(byte[] buffer,SecBufferType bufferType)
    {
        if(buffer == null || buffer.Length == 0)
        {
            throw new ArgumentException("buffer cannot be null or 0 length");
        }

        Buffer = buffer;
        BufferType = bufferType;
    }
};

[StructLayout(LayoutKind.Sequential)]
public struct SecBufferDesc : IDisposable
{

    public int ulVersion;
    public int cBuffers;
    public IntPtr pBuffers; //Point to SecBuffer

    public SecBufferDesc(int bufferSize)
    {
    ulVersion = (int)SecBufferType.SECBUFFER_VERSION;
    cBuffers = 1;
        SecBuffer ThisSecBuffer = new SecBuffer(bufferSize);
    pBuffers = Marshal.AllocHGlobal(Marshal.SizeOf(ThisSecBuffer));
    Marshal.StructureToPtr(ThisSecBuffer,pBuffers,false);
    }

    public SecBufferDesc(byte[] secBufferBytes)
    {
        ulVersion = (int)SecBufferType.SECBUFFER_VERSION;
        cBuffers = 1;
        SecBuffer ThisSecBuffer = new SecBuffer(secBufferBytes);
        pBuffers = Marshal.AllocHGlobal(Marshal.SizeOf(ThisSecBuffer));
        Marshal.StructureToPtr(ThisSecBuffer,pBuffers,false);
    }

    public SecBufferDesc(MultipleSecBufferHelper[] secBufferBytesArray)
    {
        if(secBufferBytesArray == null || secBufferBytesArray.Length == 0)
        {
            throw new ArgumentException("secBufferBytesArray cannot be null or 0 length");
        }

        ulVersion = (int)SecBufferType.SECBUFFER_VERSION;
        cBuffers = secBufferBytesArray.Length;

        //Allocate memory for SecBuffer Array....
        pBuffers = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(SecBuffer)) * cBuffers);

        for(int Index = 0;Index < secBufferBytesArray.Length;Index++)
        {
            //Super hack: Now allocate memory for the individual SecBuffers
            //and just copy the bit values to the SecBuffer array!!!
            SecBuffer ThisSecBuffer = new SecBuffer(secBufferBytesArray[Index].Buffer,secBufferBytesArray[Index].BufferType);

            //We will write out bits in the following order:
            //int cbBuffer;
            //int BufferType;
            //pvBuffer;
            //Note that we won't be releasing the memory allocated by ThisSecBuffer until we
            //are disposed...
            int CurrentOffset = Index*Marshal.SizeOf(typeof(SecBuffer));
            Marshal.WriteInt32(pBuffers,CurrentOffset,ThisSecBuffer.cbBuffer);    
            Marshal.WriteInt32(pBuffers,CurrentOffset + Marshal.SizeOf(ThisSecBuffer.cbBuffer),ThisSecBuffer.BufferType);
            Marshal.WriteIntPtr(pBuffers,CurrentOffset + Marshal.SizeOf(ThisSecBuffer.cbBuffer)+Marshal.SizeOf(ThisSecBuffer.BufferType),ThisSecBuffer.pvBuffer);
        }
    }

    public void Dispose()
    {
        if(pBuffers != IntPtr.Zero)
        {
            if(cBuffers == 1)
            {
                SecBuffer ThisSecBuffer = (SecBuffer)Marshal.PtrToStructure(pBuffers,typeof(SecBuffer));
                ThisSecBuffer.Dispose();
            }
            else
            {
                for(int Index = 0;Index < cBuffers;Index++)
                {
                    //The bits were written out the following order:
                    //int cbBuffer;
                    //int BufferType;
                    //pvBuffer;
                    //What we need to do here is to grab a hold of the pvBuffer allocate by the individual
                    //SecBuffer and release it...
                    int CurrentOffset = Index*Marshal.SizeOf(typeof(SecBuffer));
                    IntPtr SecBufferpvBuffer = Marshal.ReadIntPtr(pBuffers,CurrentOffset + Marshal.SizeOf(typeof(int))+Marshal.SizeOf(typeof(int)));
                    Marshal.FreeHGlobal(SecBufferpvBuffer);
                }
            }

            Marshal.FreeHGlobal(pBuffers);
            pBuffers = IntPtr.Zero;
        }
    }

    public byte[] GetSecBufferByteArray()
    {
        byte[] Buffer = null;

        if(pBuffers == IntPtr.Zero)
        {
            throw new InvalidOperationException("Object has already been disposed!!!");
        }

        if(cBuffers == 1)
        {
            SecBuffer ThisSecBuffer = (SecBuffer)Marshal.PtrToStructure(pBuffers,typeof(SecBuffer));

            if(ThisSecBuffer.cbBuffer > 0)
            {
                Buffer = new byte[ThisSecBuffer.cbBuffer];
                Marshal.Copy(ThisSecBuffer.pvBuffer,Buffer,0,ThisSecBuffer.cbBuffer);
            }
        }
        else
        {
            int BytesToAllocate = 0;

            for(int Index = 0;Index < cBuffers;Index++)
            {
                //The bits were written out the following order:
                //int cbBuffer;
                //int BufferType;
                //pvBuffer;
                //What we need to do here calculate the total number of bytes we need to copy...
                int CurrentOffset = Index*Marshal.SizeOf(typeof(SecBuffer));
                BytesToAllocate += Marshal.ReadInt32(pBuffers,CurrentOffset);    
            }

            Buffer = new byte[BytesToAllocate];

            for(int Index = 0,BufferIndex = 0;Index < cBuffers;Index++)
            {
                //The bits were written out the following order:
                //int cbBuffer;
                //int BufferType;
                //pvBuffer;
                //Now iterate over the individual buffers and put them together into a
                //byte array...
                int CurrentOffset = Index*Marshal.SizeOf(typeof(SecBuffer));
                int BytesToCopy = Marshal.ReadInt32(pBuffers,CurrentOffset);    
                IntPtr SecBufferpvBuffer = Marshal.ReadIntPtr(pBuffers,CurrentOffset + Marshal.SizeOf(typeof(int))+Marshal.SizeOf(typeof(int)));
                Marshal.Copy(SecBufferpvBuffer,Buffer,BufferIndex,BytesToCopy);
                BufferIndex += BytesToCopy;
            }
        }

        return(Buffer);
    }

    /*public SecBuffer GetSecBuffer()
    {
        if(pBuffers == IntPtr.Zero)
        {
            throw new InvalidOperationException("Object has already been disposed!!!");
        }

        return((SecBuffer)Marshal.PtrToStructure(pBuffers,typeof(SecBuffer)));
    }*/
}


[StructLayout(LayoutKind.Sequential)]
public struct SECURITY_INTEGER
{
    public uint LowPart;
    public int HighPart;
    public SECURITY_INTEGER(int dummy)
    {
    LowPart = 0;
    HighPart = 0;
    }
};

[StructLayout(LayoutKind.Sequential)]
public struct SECURITY_HANDLE
{
    public IntPtr LowPart;
    public IntPtr HighPart;
    public SECURITY_HANDLE(int dummy)
    {
    LowPart = HighPart = IntPtr.Zero;
    }
};

[StructLayout(LayoutKind.Sequential)]
public struct SecPkgContext_Sizes
{
    public uint cbMaxToken;
    public uint cbMaxSignature;
    public uint cbBlockSize;
    public uint cbSecurityTrailer;
};


namespace SSPITest
{
    public class SSPIHelper
    {
    public const int TOKEN_QUERY = 0x00008;
    public const int SEC_E_OK = 0;
        public const int SEC_I_CONTINUE_NEEDED = 0x90312;
        const int SECPKG_CRED_OUTBOUND = 2;
        const int SECURITY_NATIVE_DREP = 0x10;
        const int SECPKG_CRED_INBOUND = 1;
        const int MAX_TOKEN_SIZE = 12288;
    //For AcquireCredentialsHandle in 3er Parameter "fCredentialUse"

        SECURITY_HANDLE _hInboundCred = new SECURITY_HANDLE(0);
        public SECURITY_HANDLE _hServerContext = new SECURITY_HANDLE(0);

        SECURITY_HANDLE _hOutboundCred = new SECURITY_HANDLE(0);
        public SECURITY_HANDLE _hClientContext = new SECURITY_HANDLE(0);

        public const int ISC_REQ_DELEGATE      =     0x00000001;
        public const int ISC_REQ_MUTUAL_AUTH       =     0x00000002;
        public const int ISC_REQ_REPLAY_DETECT     =     0x00000004;
        public const int ISC_REQ_SEQUENCE_DETECT   =     0x00000008;
        public const int ISC_REQ_CONFIDENTIALITY   =     0x00000010;
        public const int ISC_REQ_USE_SESSION_KEY   =     0x00000020;
        public const int ISC_REQ_PROMPT_FOR_CREDS   =    0x00000040;
        public const int ISC_REQ_USE_SUPPLIED_CREDS =    0x00000080;
        public const int ISC_REQ_ALLOCATE_MEMORY    =    0x00000100;
        public const int ISC_REQ_USE_DCE_STYLE      =    0x00000200;
        public const int ISC_REQ_DATAGRAM       =    0x00000400;
        public const int ISC_REQ_CONNECTION     =    0x00000800;
        public const int ISC_REQ_CALL_LEVEL     =    0x00001000;
        public const int ISC_REQ_FRAGMENT_SUPPLIED  =    0x00002000;
        public const int ISC_REQ_EXTENDED_ERROR     =    0x00004000;
        public const int ISC_REQ_STREAM         =    0x00008000;
        public const int ISC_REQ_INTEGRITY      =    0x00010000;
        public const int ISC_REQ_IDENTIFY       =    0x00020000;
        public const int ISC_REQ_NULL_SESSION       =    0x00040000;
        public const int ISC_REQ_MANUAL_CRED_VALIDATION = 0x00080000;
        public const int ISC_REQ_RESERVED1      =    0x00100000;
        public const int ISC_REQ_FRAGMENT_TO_FIT    =    0x00200000;

        public const int SECPKG_ATTR_SIZES       =     0;

        public const int STANDARD_CONTEXT_ATTRIBUTES = ISC_REQ_CONFIDENTIALITY | ISC_REQ_REPLAY_DETECT | ISC_REQ_SEQUENCE_DETECT | ISC_REQ_CONNECTION;

        bool _bGotClientCredentials = false;
        bool _bGotServerCredentials = false;
        bool _bGotServerContext = false;

    [DllImport("secur32", CharSet = CharSet.Auto)]
    static extern int AcquireCredentialsHandle(
    string pszPrincipal, //SEC_CHAR*
    string pszPackage, //SEC_CHAR* //"Kerberos","NTLM","Negotiative"
    int fCredentialUse,
    IntPtr PAuthenticationID,//_LUID AuthenticationID,//pvLogonID, //PLUID
    IntPtr pAuthData,//PVOID
    int pGetKeyFn, //SEC_GET_KEY_FN
    IntPtr pvGetKeyArgument, //PVOID
    ref SECURITY_HANDLE phCredential, //SecHandle //PCtxtHandle ref
    ref SECURITY_INTEGER ptsExpiry); //PTimeStamp //TimeStamp ref

    [DllImport("secur32", CharSet = CharSet.Auto, SetLastError = true)]
    static extern int InitializeSecurityContext(ref SECURITY_HANDLE phCredential,//PCredHandle
    IntPtr phContext, //PCtxtHandle
    string pszTargetName,
    int fContextReq,
    int Reserved1,
    int TargetDataRep,
    IntPtr pInput, //PSecBufferDesc SecBufferDesc
    int Reserved2,
    out SECURITY_HANDLE phNewContext, //PCtxtHandle
    out SecBufferDesc pOutput, //PSecBufferDesc SecBufferDesc
    out uint pfContextAttr, //managed ulong == 64 bits!!!
    out SECURITY_INTEGER ptsExpiry); //PTimeStamp

        [DllImport("secur32", CharSet = CharSet.Auto, SetLastError = true)]
        static extern int InitializeSecurityContext(ref SECURITY_HANDLE phCredential,//PCredHandle
            ref SECURITY_HANDLE phContext, //PCtxtHandle
            string pszTargetName,
            int fContextReq,
            int Reserved1,
            int TargetDataRep,
            ref SecBufferDesc SecBufferDesc, //PSecBufferDesc SecBufferDesc
            int Reserved2,
            out SECURITY_HANDLE phNewContext, //PCtxtHandle
            out SecBufferDesc pOutput, //PSecBufferDesc SecBufferDesc
            out uint pfContextAttr, //managed ulong == 64 bits!!!
            out SECURITY_INTEGER ptsExpiry); //PTimeStamp

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        static extern int AcceptSecurityContext(ref SECURITY_HANDLE phCredential,
                                                IntPtr phContext,
                                                ref SecBufferDesc pInput,
                                                uint fContextReq,
                                                uint TargetDataRep,
                                                out SECURITY_HANDLE phNewContext,
                                                out SecBufferDesc pOutput,
                                                out uint pfContextAttr,    //managed ulong == 64 bits!!!
                                                out SECURITY_INTEGER ptsTimeStamp);

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        static extern int AcceptSecurityContext(ref SECURITY_HANDLE phCredential,
                                                ref SECURITY_HANDLE phContext,
                                                ref SecBufferDesc pInput,
                                                uint fContextReq,
                                                uint TargetDataRep,
                                                out SECURITY_HANDLE phNewContext,
                                                out SecBufferDesc pOutput,
                                                out uint pfContextAttr,    //managed ulong == 64 bits!!!
                                                out SECURITY_INTEGER ptsTimeStamp);

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        public static extern int ImpersonateSecurityContext(ref SECURITY_HANDLE phContext);

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        public static extern int QueryContextAttributes(ref SECURITY_HANDLE phContext,
                                                        uint ulAttribute,
                                                        out SecPkgContext_Sizes pContextAttributes);

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        public static extern int EncryptMessage(ref SECURITY_HANDLE phContext,
                                                uint fQOP,        //managed ulong == 64 bits!!!
                                                ref SecBufferDesc pMessage,
                                                uint MessageSeqNo);    //managed ulong == 64 bits!!!

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        public static extern int DecryptMessage(ref SECURITY_HANDLE phContext,
                                                 ref SecBufferDesc pMessage,
                                                 uint MessageSeqNo,
                                                 out uint pfQOP);

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        public static extern int MakeSignature(ref SECURITY_HANDLE phContext,          // Context to use
                                                uint fQOP,         // Quality of Protection
                                                ref SecBufferDesc pMessage,        // Message to sign
                                                uint MessageSeqNo);      // Message Sequence Num.

        [DllImport("secur32.Dll", CharSet = CharSet.Auto, SetLastError = false)]
        public static extern int VerifySignature(ref SECURITY_HANDLE phContext,          // Context to use
                                                ref SecBufferDesc pMessage,        // Message to sign
                                                uint MessageSeqNo,            // Message Sequence Num.
                                                out uint pfQOP);      // Quality of Protection

    string _sAccountName =  WindowsIdentity.GetCurrent().Name;

        public SSPIHelper()
        {

        }

        public SSPIHelper(string sRemotePrincipal)
        {
            _sAccountName = sRemotePrincipal;                
        }

        public void InitializeClient(out byte[] clientToken,byte[] serverToken,
                                     out bool bContinueProcessing)
        {
            clientToken = null;
            bContinueProcessing = true;

            SECURITY_INTEGER ClientLifeTime = new SECURITY_INTEGER(0);            

            if(!_bGotClientCredentials)
            {
                if(AcquireCredentialsHandle(_sAccountName,"Kerberos",SECPKG_CRED_OUTBOUND,
                                            IntPtr.Zero,IntPtr.Zero,0,IntPtr.Zero,
                                            ref _hOutboundCred,ref ClientLifeTime) != SEC_E_OK)
                {
                    throw new Exception("Couldn't acquire client credentials");
                }

                _bGotClientCredentials = true;
            }

            int ss = -1;

            SecBufferDesc ClientToken = new SecBufferDesc(MAX_TOKEN_SIZE);

            try
            {
                uint ContextAttributes = 0;

                if(serverToken == null)
                {
                    ss = InitializeSecurityContext(ref _hOutboundCred,
                        IntPtr.Zero,
                        _sAccountName,// null string pszTargetName,
                        STANDARD_CONTEXT_ATTRIBUTES,
                        0,//int Reserved1,
                        SECURITY_NATIVE_DREP,//int TargetDataRep
                        IntPtr.Zero,    //Always zero first time around...
                        0, //int Reserved2,
                        out _hClientContext, //pHandle CtxtHandle = SecHandle
                        out ClientToken,//ref SecBufferDesc pOutput, //PSecBufferDesc
                        out ContextAttributes,//ref int pfContextAttr,
                        out ClientLifeTime); //ref IntPtr ptsExpiry ); //PTimeStamp

                }
                else
                {
                    SecBufferDesc ServerToken = new SecBufferDesc(serverToken);

                    try
                    {
                        ss = InitializeSecurityContext(ref _hOutboundCred,
                            ref _hClientContext,
                            _sAccountName,// null string pszTargetName,
                            STANDARD_CONTEXT_ATTRIBUTES,
                            0,//int Reserved1,
                            SECURITY_NATIVE_DREP,//int TargetDataRep
                            ref ServerToken,    //Always zero first time around...
                            0, //int Reserved2,
                            out _hClientContext, //pHandle CtxtHandle = SecHandle
                            out ClientToken,//ref SecBufferDesc pOutput, //PSecBufferDesc
                            out ContextAttributes,//ref int pfContextAttr,
                            out ClientLifeTime); //ref IntPtr ptsExpiry ); //PTimeStamp
                    }
                    finally
                    {
                        ServerToken.Dispose();    
                    }
                }

                if(ss != SEC_E_OK && ss != SEC_I_CONTINUE_NEEDED)
                {
                    throw new Exception("InitializeSecurityContext() failed!!!");                
                }

                clientToken = ClientToken.GetSecBufferByteArray();
            }
            finally
            {
                ClientToken.Dispose();
            }

            bContinueProcessing = ss != SEC_E_OK;            
        }

        public void InitializeServer(byte[] clientToken,out byte[] serverToken,
                                     out bool bContinueProcessing)
        {
            serverToken = null;
            bContinueProcessing = true;
            SECURITY_INTEGER NewLifeTime = new SECURITY_INTEGER(0);

            if(!_bGotServerCredentials)
            {
                if(AcquireCredentialsHandle(_sAccountName,"Kerberos",SECPKG_CRED_INBOUND,
                                            IntPtr.Zero,IntPtr.Zero,0,IntPtr.Zero,
                                            ref _hInboundCred,ref NewLifeTime) != SEC_E_OK)
                {
                    throw new Exception("Couldn't acquire server credentials handle!!!");
                }

                _bGotServerCredentials = true;
            }

            SecBufferDesc ServerToken = new SecBufferDesc(MAX_TOKEN_SIZE);
            SecBufferDesc ClientToken = new SecBufferDesc(clientToken);

            try
            {    
                int ss = -1;
                uint uNewContextAttr = 0;

                if(!_bGotServerContext)
                {
                    ss = AcceptSecurityContext(ref _hInboundCred,        // [in] handle to the credentials
                        IntPtr.Zero,                // [in/out] handle of partially formed context.  Always NULL the first time through
                        ref ClientToken,            // [in] pointer to the input buffers
                        STANDARD_CONTEXT_ATTRIBUTES,                        // [in] required context attributes
                        SECURITY_NATIVE_DREP,    // [in] data representation on the target
                        out _hServerContext,    // [in/out] receives the new context handle    
                        out ServerToken,        // [in/out] pointer to the output buffers
                        out uNewContextAttr,    // [out] receives the context attributes        
                        out NewLifeTime);        // [out] receives the life span of the security context
                }
                else
                {
                    ss = AcceptSecurityContext(ref _hInboundCred,        // [in] handle to the credentials
                        ref _hServerContext,                // [in/out] handle of partially formed context.  Always NULL the first time through
                        ref ClientToken,            // [in] pointer to the input buffers
                        STANDARD_CONTEXT_ATTRIBUTES,                        // [in] required context attributes
                        SECURITY_NATIVE_DREP,    // [in] data representation on the target
                        out _hServerContext,    // [in/out] receives the new context handle    
                        out ServerToken,        // [in/out] pointer to the output buffers
                        out uNewContextAttr,    // [out] receives the context attributes        
                        out NewLifeTime);        // [out] receives the life span of the security context
                }

                if(ss != SEC_E_OK && ss != SEC_I_CONTINUE_NEEDED)
                {
                    throw new Exception("AcceptSecurityContext() failed!!!");                
                }

                if(!_bGotServerContext)
                {
                    _bGotServerContext = true;
                }

                serverToken = ServerToken.GetSecBufferByteArray();

                bContinueProcessing = ss != SEC_E_OK;        
            }        
            finally
            {
                ClientToken.Dispose();
                ServerToken.Dispose();    
            }
        }                            

        public void EncryptMessage(byte[] message,bool bUseClientContext,out byte[] encryptedBuffer)
        {
            encryptedBuffer = null;

            SECURITY_HANDLE EncryptionContext = _hServerContext;

            if(bUseClientContext)
            {
                EncryptionContext = _hClientContext;    
            }

            SecPkgContext_Sizes ContextSizes = new SecPkgContext_Sizes();

            if(QueryContextAttributes(ref EncryptionContext,SECPKG_ATTR_SIZES,out ContextSizes) != SEC_E_OK)
            {
                throw new Exception("QueryContextAttribute() failed!!!");                    
            }

            MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[2];
            ThisSecHelper[0] = new MultipleSecBufferHelper(message,SecBufferType.SECBUFFER_DATA);
            ThisSecHelper[1] = new MultipleSecBufferHelper(new byte[ContextSizes.cbSecurityTrailer],SecBufferType.SECBUFFER_TOKEN);

            SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);

            try
            {
                if(EncryptMessage(ref EncryptionContext,0,ref DescBuffer,0) != SEC_E_OK)
                {
                    throw new Exception("EncryptMessage() failed!!!");                    
                }

                encryptedBuffer = DescBuffer.GetSecBufferByteArray();    
            }
            finally
            {
                DescBuffer.Dispose();
            }
        }

        public void DecryptMessage(int messageLength,byte[] encryptedBuffer,bool bUseClientContext,
                                    out byte[] decryptedBuffer)
        {
            decryptedBuffer = null;

            SECURITY_HANDLE DecryptionContext = _hServerContext;

            if(bUseClientContext)
            {
                DecryptionContext = _hClientContext;    
            }

            byte[] EncryptedMessage = new byte[messageLength];
            Array.Copy(encryptedBuffer,0,EncryptedMessage,0,messageLength);

            int SecurityTrailerLength = encryptedBuffer.Length - messageLength;

            byte[] SecurityTrailer = new byte[SecurityTrailerLength];
            Array.Copy(encryptedBuffer,messageLength,SecurityTrailer,0,SecurityTrailerLength);

            MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[2];
            ThisSecHelper[0] = new MultipleSecBufferHelper(EncryptedMessage,SecBufferType.SECBUFFER_DATA);
            ThisSecHelper[1] = new MultipleSecBufferHelper(SecurityTrailer,SecBufferType.SECBUFFER_TOKEN);
            SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);                            
            try
            {
                uint EncryptionQuality = 0;

                if(DecryptMessage(ref DecryptionContext,ref DescBuffer,0,out EncryptionQuality) != SEC_E_OK)
                {
                    throw new Exception("DecryptMessage() failed!!!");                    
                }

                decryptedBuffer = new byte[messageLength];
                Array.Copy(DescBuffer.GetSecBufferByteArray(),0,decryptedBuffer,0,messageLength);
            }
            finally
            {
                DescBuffer.Dispose();
            }
        }

        public void SignMessage(byte[] message,bool bUseClientContext,out byte[] signedBuffer,
                                ref SECURITY_HANDLE hServerContext)
        {
            signedBuffer = null;

            SECURITY_HANDLE EncryptionContext = _hServerContext;

            if(bUseClientContext)
            {
                EncryptionContext = _hClientContext;    
            }

            SecPkgContext_Sizes ContextSizes = new SecPkgContext_Sizes();

            if(QueryContextAttributes(ref EncryptionContext,SECPKG_ATTR_SIZES,out ContextSizes) != SEC_E_OK)
            {
                throw new Exception("QueryContextAttribute() failed!!!");                    
            }

            MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[2];
            ThisSecHelper[0] = new MultipleSecBufferHelper(message,SecBufferType.SECBUFFER_DATA);
            ThisSecHelper[1] = new MultipleSecBufferHelper(new byte[ContextSizes.cbMaxSignature],SecBufferType.SECBUFFER_TOKEN);

            SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);

            try
            {
                if(MakeSignature(ref EncryptionContext,0,ref DescBuffer,0) != SEC_E_OK)
                {
                    throw new Exception("MakeSignature() failed!!!");                    
                }

                //SSPIHelper.SignAndVerify(ref _hClientContext,ref hServerContext,ref DescBuffer);
                uint EncryptionQuality = 0;
                VerifySignature(ref this._hServerContext,ref DescBuffer,0,out EncryptionQuality);

                signedBuffer = DescBuffer.GetSecBufferByteArray();    
            }
            finally
            {
                DescBuffer.Dispose();
            }        
        }

        public void VerifyMessage(int messageLength,byte[] signedBuffer,bool bUseClientContext,
                                    out byte[] verifiedBuffer)
        {
            verifiedBuffer = null;

            SECURITY_HANDLE DecryptionContext = _hServerContext;

            if(bUseClientContext)
            {
                DecryptionContext = _hClientContext;    
            }

            byte[] SignedMessage = new byte[messageLength];
            Array.Copy(signedBuffer,0,SignedMessage,0,messageLength);

            int SignatureLength = signedBuffer.Length - messageLength;

            byte[] Signature = new byte[SignatureLength];
            Array.Copy(signedBuffer,messageLength,Signature,0,SignatureLength);

            MultipleSecBufferHelper[] ThisSecHelper = new MultipleSecBufferHelper[2];
            ThisSecHelper[0] = new MultipleSecBufferHelper(SignedMessage,SecBufferType.SECBUFFER_DATA);
            ThisSecHelper[1] = new MultipleSecBufferHelper(Signature,SecBufferType.SECBUFFER_TOKEN);
            SecBufferDesc DescBuffer = new SecBufferDesc(ThisSecHelper);                            
            try
            {
                uint EncryptionQuality = 0;

                int Return = VerifySignature(ref DecryptionContext,ref DescBuffer,0,out EncryptionQuality);

                if(Return != SEC_E_OK)
                {
                    throw new Exception("VerifySignature() failed!!!");                    
                }

                verifiedBuffer = new byte[messageLength];
                Array.Copy(DescBuffer.GetSecBufferByteArray(),0,verifiedBuffer,0,messageLength);
            }
            finally
            {
                DescBuffer.Dispose();
            }
        }
    }

    class TestMe
    {
        static void Main(string[] args)
        {
            try
            {

                SSPIHelper MyHelper = new SSPIHelper();
                SSPIHelper MyServerHelper = new SSPIHelper();

                byte[] ClientToken = null;
                byte[] ServerToken = null;
                bool bContinueClient = true, bContinueServer = true;
                while(bContinueClient || bContinueServer)
                {
                    MyHelper.InitializeClient(out ClientToken,ServerToken,out bContinueClient);
                    MyServerHelper.InitializeServer(ClientToken,out ServerToken,out bContinueServer);
                }
                byte[] Message = System.Text.Encoding.ASCII.GetBytes("hi there");
                byte[] EncryptedBuffer = null;

                MyHelper.EncryptMessage(Message,true,out EncryptedBuffer);

                byte[] DecryptedBuffer;
                MyServerHelper.DecryptMessage(Message.Length,EncryptedBuffer,false,out DecryptedBuffer);
                Console.WriteLine(System.Text.Encoding.ASCII.GetString(DecryptedBuffer));
            }
            catch(Exception Ex)
            {
                Console.WriteLine(Marshal.GetLastWin32Error());
            }
        }
    }
    }

Alternative Managed API:

Whidbey makes it trivial to Kerberize your application using NegotiateStream. Check the Beta documentation for details...

Documentation

Please edit this page!

Do you have...

  • helpful tips or sample code to share for using this API in managed code?
  • corrections to the existing content?
  • variations of the signature you want to share?
  • additional languages you want to include?

Select "Edit This Page" on the right hand toolbar and edit it! Or add new pages containing supporting types needed for this API (structures, delegates, and more).

 
Access PInvoke.net directly from VS:
Terms of Use
Edit This Page
Find References
Show Printable Version
Revisions