/**

 * FreeRDP: A Remote Desktop Protocol Implementation

 * Smartcard Device Service Virtual Channel

 *

 * Copyright 2011 O.S. Systems Software Ltda.

 * Copyright 2011 Eduardo Fiss Beloni <beloni@ossystems.com.br>

 * Copyright 2011 Anthony Tong <atong@trustedcs.com>

 * Copyright 2015 Thincast Technologies GmbH

 * Copyright 2015 DI (FH) Martin Haimberger <martin.haimberger@thincast.com>

 * Copyright 2016 David PHAM-VAN <d.phamvan@inuvika.com>

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *     http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include <freerdp/config.h>

#include <winpr/crt.h>

#include <winpr/smartcard.h>

#include <winpr/environment.h>

#include <freerdp/freerdp.h>

#include <freerdp/channels/rdpdr.h>

#include <freerdp/channels/scard.h>

#include <freerdp/utils/smartcard_call.h>

#include <freerdp/utils/smartcard_operations.h>

#include <freerdp/utils/rdpdr_utils.h>

#include "smartcard_main.h"

#define CAST_FROM_DEVICE(device) cast_device_from(device, __func__, __FILE__, __LINE__)

typedef struct

{

  SMARTCARD_OPERATION operation;

  IRP* irp;

} scard_irp_queue_element;

static SMARTCARD_DEVICE* sSmartcard = NULL;

static void smartcard_context_free(void* pCtx);

static UINT smartcard_complete_irp(SMARTCARD_DEVICE* smartcard, IRP* irp, BOOL* handled);

static SMARTCARD_DEVICE* cast_device_from(DEVICE* device, const char* fkt, const char* file,

                                          size_t line)

{

  if (!device)

  {

    WLog_ERR(TAG, "%s [%s:%" PRIuz "] Called smartcard channel with NULL device", fkt, file,

             line);

    return NULL;

  }

  if (device->type != RDPDR_DTYP_SMARTCARD)

  {

    WLog_ERR(TAG,

             "%s [%s:%" PRIuz "] Called smartcard channel with invalid device of type %" PRIx32,

             fkt, file, line, device->type);

    return NULL;

  }

  return (SMARTCARD_DEVICE*)device;

}

static DWORD WINAPI smartcard_context_thread(LPVOID arg)

{

  SMARTCARD_CONTEXT* pContext = (SMARTCARD_CONTEXT*)arg;

  DWORD nCount = 0;

  LONG status = 0;

  DWORD waitStatus = 0;

  HANDLE hEvents[2] = { 0 };

  wMessage message = { 0 };

  SMARTCARD_DEVICE* smartcard = NULL;

  UINT error = CHANNEL_RC_OK;

  smartcard = pContext->smartcard;

  hEvents[nCount++] = MessageQueue_Event(pContext->IrpQueue);

  while (1)

  {

    waitStatus = WaitForMultipleObjects(nCount, hEvents, FALSE, INFINITE);

    if (waitStatus == WAIT_FAILED)

    {

      error = GetLastError();

      WLog_ERR(TAG, "WaitForMultipleObjects failed with error %" PRIu32 "!", error);

      break;

    }

    waitStatus = WaitForSingleObject(MessageQueue_Event(pContext->IrpQueue), 0);

    if (waitStatus == WAIT_FAILED)

    {

      error = GetLastError();

      WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "!", error);

      break;

    }

    if (waitStatus == WAIT_OBJECT_0)

    {

      scard_irp_queue_element* element = NULL;

      if (!MessageQueue_Peek(pContext->IrpQueue, &message, TRUE))

      {

        WLog_ERR(TAG, "MessageQueue_Peek failed!");

        status = ERROR_INTERNAL_ERROR;

        break;

      }

      if (message.id == WMQ_QUIT)

        break;

      element = (scard_irp_queue_element*)message.wParam;

      if (element)

      {

        BOOL handled = FALSE;

        WINPR_ASSERT(smartcard);

        if ((status = smartcard_irp_device_control_call(

                 smartcard->callctx, element->irp->output, &element->irp->IoStatus,

                 &element->operation)))

        {

          element->irp->Discard(element->irp);

          smartcard_operation_free(&element->operation, TRUE);

          WLog_ERR(TAG, "smartcard_irp_device_control_call failed with error %" PRIu32 "",

                   status);

          break;

        }

        error = smartcard_complete_irp(smartcard, element->irp, &handled);

        if (!handled)

          element->irp->Discard(element->irp);

        smartcard_operation_free(&element->operation, TRUE);

        if (error)

        {

          WLog_ERR(TAG, "Queue_Enqueue failed!");

          break;

        }

      }

    }

  }

  if (status && smartcard->rdpcontext)

    setChannelError(smartcard->rdpcontext, error, "smartcard_context_thread reported an error");

  ExitThread((uint32_t)status);

  return error;

}

static void smartcard_operation_queue_free(void* obj)

{

  wMessage* msg = obj;

  if (!msg)

    return;

  if (msg->id != 0)

    return;

  scard_irp_queue_element* element = (scard_irp_queue_element*)msg->wParam;

  if (!element)

    return;

  WINPR_ASSERT(element->irp);

  WINPR_ASSERT(element->irp->Discard);

  element->irp->Discard(element->irp);

  smartcard_operation_free(&element->operation, TRUE);

}

static void* smartcard_context_new(void* smartcard, SCARDCONTEXT hContext)

{

  SMARTCARD_CONTEXT* pContext = NULL;

  pContext = (SMARTCARD_CONTEXT*)calloc(1, sizeof(SMARTCARD_CONTEXT));

  if (!pContext)

  {

    WLog_ERR(TAG, "calloc failed!");

    return pContext;

  }

  pContext->smartcard = smartcard;

  pContext->hContext = hContext;

  pContext->IrpQueue = MessageQueue_New(NULL);

  if (!pContext->IrpQueue)

  {

    WLog_ERR(TAG, "MessageQueue_New failed!");

    goto fail;

  }

  wObject* obj = MessageQueue_Object(pContext->IrpQueue);

  WINPR_ASSERT(obj);

  obj->fnObjectFree = smartcard_operation_queue_free;

  pContext->thread = CreateThread(NULL, 0, smartcard_context_thread, pContext, 0, NULL);

  if (!pContext->thread)

  {

    WLog_ERR(TAG, "CreateThread failed!");

    goto fail;

  }

  return pContext;

fail:

  smartcard_context_free(pContext);

  return NULL;

}

void smartcard_context_free(void* pCtx)

{

  SMARTCARD_CONTEXT* pContext = pCtx;

  if (!pContext)

    return;

  /* cancel blocking calls like SCardGetStatusChange */

  WINPR_ASSERT(pContext->smartcard);

  smartcard_call_cancel_context(pContext->smartcard->callctx, pContext->hContext);

  if (pContext->IrpQueue)

  {

    if (MessageQueue_PostQuit(pContext->IrpQueue, 0))

    {

      if (WaitForSingleObject(pContext->thread, INFINITE) == WAIT_FAILED)

        WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "!", GetLastError());

      (void)CloseHandle(pContext->thread);

    }

    MessageQueue_Free(pContext->IrpQueue);

  }

  smartcard_call_release_context(pContext->smartcard->callctx, pContext->hContext);

  free(pContext);

}

static void smartcard_release_all_contexts(SMARTCARD_DEVICE* smartcard)

{

  smartcard_call_cancel_all_context(smartcard->callctx);

}

static UINT smartcard_free_(SMARTCARD_DEVICE* smartcard)

{

  if (!smartcard)

    return CHANNEL_RC_OK;

  if (smartcard->IrpQueue)

  {

    MessageQueue_Free(smartcard->IrpQueue);

    (void)CloseHandle(smartcard->thread);

  }

  Stream_Free(smartcard->device.data, TRUE);

  ListDictionary_Free(smartcard->rgOutstandingMessages);

  smartcard_call_context_free(smartcard->callctx);

  free(smartcard);

  return CHANNEL_RC_OK;

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT smartcard_free(DEVICE* device)

{

  SMARTCARD_DEVICE* smartcard = CAST_FROM_DEVICE(device);

  if (!smartcard)

    return ERROR_INVALID_PARAMETER;

  /**

   * Calling smartcard_release_all_contexts to unblock all operations waiting for transactions

   * to unlock.

   */

  smartcard_release_all_contexts(smartcard);

  /* Stopping all threads and cancelling all IRPs */

  if (smartcard->IrpQueue)

  {

    if (MessageQueue_PostQuit(smartcard->IrpQueue, 0) &&

        (WaitForSingleObject(smartcard->thread, INFINITE) == WAIT_FAILED))

    {

      DWORD error = GetLastError();

      WLog_ERR(TAG, "WaitForSingleObject failed with error %" PRIu32 "!", error);

      return error;

    }

  }

  if (sSmartcard == smartcard)

    sSmartcard = NULL;

  return smartcard_free_(smartcard);

}

/**

 * Initialization occurs when the protocol server sends a device announce message.

 * At that time, we need to cancel all outstanding IRPs.

 */

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT smartcard_init(DEVICE* device)

{

  SMARTCARD_DEVICE* smartcard = CAST_FROM_DEVICE(device);

  if (!smartcard)

    return ERROR_INVALID_PARAMETER;

  smartcard_release_all_contexts(smartcard);

  return CHANNEL_RC_OK;

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

UINT smartcard_complete_irp(SMARTCARD_DEVICE* smartcard, IRP* irp, BOOL* handled)

{

  WINPR_ASSERT(smartcard);

  WINPR_ASSERT(irp);

  WINPR_ASSERT(handled);

  uintptr_t key = (uintptr_t)irp->CompletionId + 1;

  ListDictionary_Remove(smartcard->rgOutstandingMessages, (void*)key);

  WINPR_ASSERT(irp->Complete);

  *handled = TRUE;

  return irp->Complete(irp);

}

/**

 * Multiple threads and SCardGetStatusChange:

 * http://musclecard.996296.n3.nabble.com/Multiple-threads-and-SCardGetStatusChange-td4430.html

 */

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT smartcard_process_irp(SMARTCARD_DEVICE* smartcard, IRP* irp, BOOL* handled)

{

  LONG status = 0;

  BOOL asyncIrp = FALSE;

  SMARTCARD_CONTEXT* pContext = NULL;

  WINPR_ASSERT(smartcard);

  WINPR_ASSERT(handled);

  WINPR_ASSERT(irp);

  WINPR_ASSERT(irp->Complete);

  uintptr_t key = (uintptr_t)irp->CompletionId + 1;

  if (!ListDictionary_Add(smartcard->rgOutstandingMessages, (void*)key, irp))

  {

    WLog_ERR(TAG, "ListDictionary_Add failed!");

    return ERROR_INTERNAL_ERROR;

  }

  if (irp->MajorFunction == IRP_MJ_DEVICE_CONTROL)

  {

    scard_irp_queue_element* element = calloc(1, sizeof(scard_irp_queue_element));

    if (!element)

      return ERROR_OUTOFMEMORY;

    element->irp = irp;

    element->operation.completionID = irp->CompletionId;

    status = smartcard_irp_device_control_decode(irp->input, irp->CompletionId, irp->FileId,

                                                 &element->operation);

    if (status != SCARD_S_SUCCESS)

    {

      UINT error = 0;

      smartcard_operation_free(&element->operation, TRUE);

      irp->IoStatus = STATUS_UNSUCCESSFUL;

      if ((error = smartcard_complete_irp(smartcard, irp, handled)))

      {

        WLog_ERR(TAG, "Queue_Enqueue failed!");

        return error;

      }

      return CHANNEL_RC_OK;

    }

    asyncIrp = TRUE;

    switch (element->operation.ioControlCode)

    {

      case SCARD_IOCTL_ESTABLISHCONTEXT:

      case SCARD_IOCTL_RELEASECONTEXT:

      case SCARD_IOCTL_ISVALIDCONTEXT:

      case SCARD_IOCTL_CANCEL:

      case SCARD_IOCTL_ACCESSSTARTEDEVENT:

      case SCARD_IOCTL_RELEASETARTEDEVENT:

        asyncIrp = FALSE;

        break;

      case SCARD_IOCTL_LISTREADERGROUPSA:

      case SCARD_IOCTL_LISTREADERGROUPSW:

      case SCARD_IOCTL_LISTREADERSA:

      case SCARD_IOCTL_LISTREADERSW:

      case SCARD_IOCTL_INTRODUCEREADERGROUPA:

      case SCARD_IOCTL_INTRODUCEREADERGROUPW:

      case SCARD_IOCTL_FORGETREADERGROUPA:

      case SCARD_IOCTL_FORGETREADERGROUPW:

      case SCARD_IOCTL_INTRODUCEREADERA:

      case SCARD_IOCTL_INTRODUCEREADERW:

      case SCARD_IOCTL_FORGETREADERA:

      case SCARD_IOCTL_FORGETREADERW:

      case SCARD_IOCTL_ADDREADERTOGROUPA:

      case SCARD_IOCTL_ADDREADERTOGROUPW:

      case SCARD_IOCTL_REMOVEREADERFROMGROUPA:

      case SCARD_IOCTL_REMOVEREADERFROMGROUPW:

      case SCARD_IOCTL_LOCATECARDSA:

      case SCARD_IOCTL_LOCATECARDSW:

      case SCARD_IOCTL_LOCATECARDSBYATRA:

      case SCARD_IOCTL_LOCATECARDSBYATRW:

      case SCARD_IOCTL_READCACHEA:

      case SCARD_IOCTL_READCACHEW:

      case SCARD_IOCTL_WRITECACHEA:

      case SCARD_IOCTL_WRITECACHEW:

      case SCARD_IOCTL_GETREADERICON:

      case SCARD_IOCTL_GETDEVICETYPEID:

      case SCARD_IOCTL_GETSTATUSCHANGEA:

      case SCARD_IOCTL_GETSTATUSCHANGEW:

      case SCARD_IOCTL_CONNECTA:

      case SCARD_IOCTL_CONNECTW:

      case SCARD_IOCTL_RECONNECT:

      case SCARD_IOCTL_DISCONNECT:

      case SCARD_IOCTL_BEGINTRANSACTION:

      case SCARD_IOCTL_ENDTRANSACTION:

      case SCARD_IOCTL_STATE:

      case SCARD_IOCTL_STATUSA:

      case SCARD_IOCTL_STATUSW:

      case SCARD_IOCTL_TRANSMIT:

      case SCARD_IOCTL_CONTROL:

      case SCARD_IOCTL_GETATTRIB:

      case SCARD_IOCTL_SETATTRIB:

      case SCARD_IOCTL_GETTRANSMITCOUNT:

        asyncIrp = TRUE;

        break;

      default:

        break;

    }

    pContext = smartcard_call_get_context(smartcard->callctx, element->operation.hContext);

    if (!pContext)

      asyncIrp = FALSE;

    if (!asyncIrp)

    {

      UINT error = 0;

      status =

          smartcard_irp_device_control_call(smartcard->callctx, element->irp->output,

                                            &element->irp->IoStatus, &element->operation);

      smartcard_operation_free(&element->operation, TRUE);

      if (status)

      {

        WLog_ERR(TAG, "smartcard_irp_device_control_call failed with error %" PRId32 "!",

                 status);

        return (UINT32)status;

      }

      if ((error = smartcard_complete_irp(smartcard, irp, handled)))

      {

        WLog_ERR(TAG, "Queue_Enqueue failed!");

        return error;

      }

    }

    else

    {

      if (pContext)

      {

        if (!MessageQueue_Post(pContext->IrpQueue, NULL, 0, (void*)element, NULL))

        {

          smartcard_operation_free(&element->operation, TRUE);

          WLog_ERR(TAG, "MessageQueue_Post failed!");

          return ERROR_INTERNAL_ERROR;

        }

        *handled = TRUE;

      }

    }

  }

  else

  {

    UINT ustatus = 0;

    WLog_ERR(TAG, "Unexpected SmartCard IRP: MajorFunction %s, MinorFunction: 0x%08" PRIX32 "",

             rdpdr_irp_string(irp->MajorFunction), irp->MinorFunction);

    irp->IoStatus = STATUS_NOT_SUPPORTED;

    if ((ustatus = smartcard_complete_irp(smartcard, irp, handled)))

    {

      WLog_ERR(TAG, "Queue_Enqueue failed!");

      return ustatus;

    }

  }

  return CHANNEL_RC_OK;

}

static DWORD WINAPI smartcard_thread_func(LPVOID arg)

{

  IRP* irp = NULL;

  DWORD nCount = 0;

  DWORD status = 0;

  HANDLE hEvents[1] = { 0 };

  wMessage message = { 0 };

  UINT error = CHANNEL_RC_OK;

  SMARTCARD_DEVICE* smartcard = CAST_FROM_DEVICE(arg);

  if (!smartcard)

    return ERROR_INVALID_PARAMETER;

  hEvents[nCount++] = MessageQueue_Event(smartcard->IrpQueue);

  while (1)

  {

    status = WaitForMultipleObjects(nCount, hEvents, FALSE, INFINITE);

    if (status == WAIT_FAILED)

    {

      error = GetLastError();

      WLog_ERR(TAG, "WaitForMultipleObjects failed with error %" PRIu32 "!", error);

      break;

    }

    if (status == WAIT_OBJECT_0)

    {

      if (!MessageQueue_Peek(smartcard->IrpQueue, &message, TRUE))

      {

        WLog_ERR(TAG, "MessageQueue_Peek failed!");

        error = ERROR_INTERNAL_ERROR;

        break;

      }

      if (message.id == WMQ_QUIT)

        break;

      irp = (IRP*)message.wParam;

      if (irp)

      {

        BOOL handled = FALSE;

        if ((error = smartcard_process_irp(smartcard, irp, &handled)))

        {

          WLog_ERR(TAG, "smartcard_process_irp failed with error %" PRIu32 "!", error);

          goto out;

        }

        if (!handled)

        {

          WINPR_ASSERT(irp->Discard);

          irp->Discard(irp);

        }

      }

    }

  }

out:

  if (error && smartcard->rdpcontext)

    setChannelError(smartcard->rdpcontext, error, "smartcard_thread_func reported an error");

  ExitThread(error);

  return error;

}

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

static UINT smartcard_irp_request(DEVICE* device, IRP* irp)

{

  SMARTCARD_DEVICE* smartcard = CAST_FROM_DEVICE(device);

  if (!smartcard)

    return ERROR_INVALID_PARAMETER;

  if (!MessageQueue_Post(smartcard->IrpQueue, NULL, 0, (void*)irp, NULL))

  {

    WLog_ERR(TAG, "MessageQueue_Post failed!");

    return ERROR_INTERNAL_ERROR;

  }

  return CHANNEL_RC_OK;

}

static void smartcard_free_irp(void* obj)

{

  wMessage* msg = obj;

  if (!msg)

    return;

  if (msg->id != 0)

    return;

  IRP* irp = (IRP*)msg->wParam;

  if (!irp)

    return;

  WINPR_ASSERT(irp->Discard);

  irp->Discard(irp);

}

/* smartcard is always built-in */

#define DeviceServiceEntry smartcard_DeviceServiceEntry

/**

 * Function description

 *

 * @return 0 on success, otherwise a Win32 error code

 */

FREERDP_ENTRY_POINT(UINT VCAPITYPE DeviceServiceEntry(PDEVICE_SERVICE_ENTRY_POINTS pEntryPoints))

{

  SMARTCARD_DEVICE* smartcard = NULL;

  size_t length = 0;

  UINT error = CHANNEL_RC_NO_MEMORY;

  if (!sSmartcard)

  {

    smartcard = (SMARTCARD_DEVICE*)calloc(1, sizeof(SMARTCARD_DEVICE));

    if (!smartcard)

    {

      WLog_ERR(TAG, "calloc failed!");

      return CHANNEL_RC_NO_MEMORY;

    }

    smartcard->device.type = RDPDR_DTYP_SMARTCARD;

    smartcard->device.name = "SCARD";

    smartcard->device.IRPRequest = smartcard_irp_request;

    smartcard->device.Init = smartcard_init;

    smartcard->device.Free = smartcard_free;

    smartcard->rdpcontext = pEntryPoints->rdpcontext;

    length = strlen(smartcard->device.name);

    smartcard->device.data = Stream_New(NULL, length + 1);

    if (!smartcard->device.data)

    {

      WLog_ERR(TAG, "Stream_New failed!");

      goto fail;

    }

    Stream_Write(smartcard->device.data, "SCARD", 6);

    smartcard->IrpQueue = MessageQueue_New(NULL);

    if (!smartcard->IrpQueue)

    {

      WLog_ERR(TAG, "MessageQueue_New failed!");

      goto fail;

    }

    wObject* obj = MessageQueue_Object(smartcard->IrpQueue);

    WINPR_ASSERT(obj);

    obj->fnObjectFree = smartcard_free_irp;

    smartcard->rgOutstandingMessages = ListDictionary_New(TRUE);

    if (!smartcard->rgOutstandingMessages)

    {

      WLog_ERR(TAG, "ListDictionary_New failed!");

      goto fail;

    }

    smartcard->callctx = smartcard_call_context_new(smartcard->rdpcontext->settings);

    if (!smartcard->callctx)

      goto fail;

    if (!smarcard_call_set_callbacks(smartcard->callctx, smartcard, smartcard_context_new,

                                     smartcard_context_free))

      goto fail;

    if ((error = pEntryPoints->RegisterDevice(pEntryPoints->devman, &smartcard->device)))

    {

      WLog_ERR(TAG, "RegisterDevice failed!");

      goto fail;

    }

    smartcard->thread =

        CreateThread(NULL, 0, smartcard_thread_func, smartcard, CREATE_SUSPENDED, NULL);

    if (!smartcard->thread)

    {

      WLog_ERR(TAG, "ListDictionary_New failed!");

      error = ERROR_INTERNAL_ERROR;

      goto fail;

    }

    ResumeThread(smartcard->thread);

  }

  else

    smartcard = sSmartcard;

  if (pEntryPoints->device->Name)

  {

    smartcard_call_context_add(smartcard->callctx, pEntryPoints->device->Name);

  }

  sSmartcard = smartcard;

  return CHANNEL_RC_OK;

fail:

  smartcard_free_(smartcard);

  return error;

}