Disconnecting from a Server

Code comparable to the following would be used in a client application to gracefully end a secure connection with a server.

DWORD           dwType;
SecBufferDesc   OutBuffer;
SecBuffer       OutBuffers[1];
DWORD           dwSSPIFlags;
DWORD           dwSSPIOutFlags;
TimeStamp       tsExpiry;
DWORD           Status;

dwType = SCHANNEL_SHUTDOWN;

OutBuffers[0].pvBuffer   = &dwType;
OutBuffers[0].BufferType = SECBUFFER_TOKEN;
OutBuffers[0].cbBuffer   = sizeof(dwType);

OutBuffer.cBuffers       = 1;
OutBuffer.pBuffers       = OutBuffers;
OutBuffer.ulVersion      = SECBUFFER_VERSION;

Status = g_SecurityFunc.ApplyControlToken(
        phContext, 
        &OutBuffer);

if(FAILED(Status)) 
{
    printf("**** Error 0x%x returned by ApplyControlToken\n", Status);
    g_SecurityFunc.DeleteSecurityContext(phContext);
    return;
}

//--------------------------------------------------------------------
// Build an SSL CloseNotify message.

dwSSPIFlags = ISC_REQ_SEQUENCE_DETECT   |
              ISC_REQ_REPLAY_DETECT     |
              ISC_REQ_CONFIDENTIALITY   |
              ISC_RET_EXTENDED_ERROR    |
              ISC_REQ_ALLOCATE_MEMORY   |
              ISC_REQ_STREAM;

OutBuffers[0].pvBuffer   = NULL;
OutBuffers[0].BufferType = SECBUFFER_TOKEN;
OutBuffers[0].cbBuffer   = 0;

OutBuffer.cBuffers       = 1;
OutBuffer.pBuffers       = OutBuffers;
OutBuffer.ulVersion      = SECBUFFER_VERSION;

Status = g_SecurityFunc.InitializeSecurityContextA(
                phCreds,
                phContext,
                NULL,
                dwSSPIFlags,
                0,
                SECURITY_NATIVE_DREP,
                NULL,
                0,
                phContext,
                &OutBuffer,
                &dwSSPIOutFlags,
                &tsExpiry);

if(FAILED(Status)) 
{
    printf("* Error 0x%x returned by InitializeSecurityContext\n", Status);
    g_SecurityFunc.DeleteSecurityContext(phContext);
    return;
}

//--------------------------------------------------------------------
// Send the CloseNotify message to the server.

if(OutBuffers[0].pvBuffer != NULL && OutBuffers[0].cbBuffer != 0)
{
    SendToServer(
            OutBuffers[0].pvBuffer,
            OutBuffers[0].cbBuffer);

//----------------------------------------------------------------
// Free output buffer.

    g_SecurityFunc.FreeContextBuffer(OutBuffers[0].pvBuffer);
}

//--------------------------------------------------------------------
// Free the security context.

g_SecurityFunc.DeleteSecurityContext(phContext);