text: /**
   * FreeRDP: A Remote Desktop Protocol Implementation
   * NTLM over HTTP
   *
   * Copyright 2012 Fujitsu Technology Solutions GmbH
   * Copyright 2012 Dmitrij Jasnov <dmitrij.jasnov@ts.fujitsu.com>
   * Copyright 2012 Marc-Andre Moreau <marcandre.moreau@gmail.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.
   */
  
  #ifdef HAVE_CONFIG_H
  #include "config.h"
  #endif
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <winpr/crt.h>
  #include <winpr/tchar.h>
  #include <winpr/dsparse.h>
  
  #include <openssl/rand.h>
  
  #include "http.h"
  
  #include "ntlm.h"
  
  BOOL ntlm_client_init(rdpNtlm* ntlm, BOOL http, char* user, char* domain, char* password, SecPkgContext_Bindings* Bindings)
  {
  	SECURITY_STATUS status;
  
  	sspi_GlobalInit();
  
  	ntlm->http = http;
  	ntlm->Bindings = Bindings;
  
  #ifdef WITH_NATIVE_SSPI
  	{
  		HMODULE hSSPI;
  		INIT_SECURITY_INTERFACE InitSecurityInterface;
  		PSecurityFunctionTable pSecurityInterface = NULL;
  
  		hSSPI = LoadLibrary(_T("secur32.dll"));
  
  #ifdef UNICODE
  		InitSecurityInterface = (INIT_SECURITY_INTERFACE) GetProcAddress(hSSPI, "InitSecurityInterfaceW");
  #else
  		InitSecurityInterface = (INIT_SECURITY_INTERFACE) GetProcAddress(hSSPI, "InitSecurityInterfaceA");
  #endif
  		ntlm->table = (*InitSecurityInterface)();
  	}
  #else
  	ntlm->table = InitSecurityInterface();
  #endif
  
  	sspi_SetAuthIdentity(&(ntlm->identity), user, domain, password);
  
  	status = ntlm->table->QuerySecurityPackageInfo(NTLMSP_NAME, &ntlm->pPackageInfo);
  
  	if (status != SEC_E_OK)
  	{
  		DEBUG_WARN( "QuerySecurityPackageInfo status: 0x%08X\n", status);
  		return FALSE;
  	}
  
  	ntlm->cbMaxToken = ntlm->pPackageInfo->cbMaxToken;
  
  	status = ntlm->table->AcquireCredentialsHandle(NULL, NTLMSP_NAME,
  			SECPKG_CRED_OUTBOUND, NULL, &ntlm->identity, NULL, NULL, &ntlm->credentials, &ntlm->expiration);
  
  	if (status != SEC_E_OK)
  	{
  		DEBUG_WARN( "AcquireCredentialsHandle status: 0x%08X\n", status);
  		return FALSE;
  	}
  
  	ntlm->haveContext = FALSE;
  	ntlm->haveInputBuffer = FALSE;
  	ZeroMemory(&ntlm->inputBuffer, sizeof(SecBuffer));
  	ZeroMemory(&ntlm->outputBuffer, sizeof(SecBuffer));
  	ZeroMemory(&ntlm->ContextSizes, sizeof(SecPkgContext_Sizes));
  
  	ntlm->fContextReq = 0;
  
  	if (ntlm->http)
  	{
  		/* flags for HTTP authentication */
  		ntlm->fContextReq |= ISC_REQ_CONFIDENTIALITY;
  	}
  	else
  	{
  		/** 
  		 * flags for RPC authentication:
  		 * RPC_C_AUTHN_LEVEL_PKT_INTEGRITY:
  		 * ISC_REQ_USE_DCE_STYLE | ISC_REQ_DELEGATE | ISC_REQ_MUTUAL_AUTH |
  		 * ISC_REQ_REPLAY_DETECT | ISC_REQ_SEQUENCE_DETECT
  		 */
  
  		ntlm->fContextReq |= ISC_REQ_USE_DCE_STYLE;
  		ntlm->fContextReq |= ISC_REQ_DELEGATE | ISC_REQ_MUTUAL_AUTH;
  		ntlm->fContextReq |= ISC_REQ_REPLAY_DETECT | ISC_REQ_SEQUENCE_DETECT;
  	}
  
  	return TRUE;
  }
  
  BOOL ntlm_client_make_spn(rdpNtlm* ntlm, LPCTSTR ServiceClass, char* hostname)
  {
  	int length;
  	DWORD status;
  	DWORD SpnLength;
  	LPTSTR hostnameX;
  
  	length = 0;
  
  #ifdef UNICODE
  	length = strlen(hostname);
  	hostnameX = (LPWSTR) malloc((length + 1)* sizeof(TCHAR));
  	MultiByteToWideChar(CP_UTF8, 0, hostname, length, hostnameX, length);
  	hostnameX[length] = 0;
  #else
  	hostnameX = hostname;
  #endif
  
  	if (!ServiceClass)
  	{
  		ntlm->ServicePrincipalName = (LPTSTR) _tcsdup(hostnameX);
  		if (!ntlm->ServicePrincipalName)
  			return FALSE;
  		return TRUE;
  	}
  
  	SpnLength = 0;
  	status = DsMakeSpn(ServiceClass, hostnameX, NULL, 0, NULL, &SpnLength, NULL);
  
  	if (status != ERROR_BUFFER_OVERFLOW)
  		return FALSE;
  
  	ntlm->ServicePrincipalName = (LPTSTR) malloc(SpnLength * sizeof(TCHAR));
  	if (!ntlm->ServicePrincipalName)
  		return FALSE;
  
  	status = DsMakeSpn(ServiceClass, hostnameX, NULL, 0, NULL, &SpnLength, ntlm->ServicePrincipalName);
  
  	if (status != ERROR_SUCCESS)
  		return FALSE;
  
  	return TRUE;
  }
  
  /**
   *                                        SSPI Client Ceremony
   *
   *                                           --------------
   *                                          ( Client Begin )
   *                                           --------------
   *                                                 |
   *                                                 |
   *                                                \|/
   *                                      -----------+--------------
   *                                     | AcquireCredentialsHandle |
   *                                      --------------------------
   *                                                 |
   *                                                 |
   *                                                \|/
   *                                    -------------+--------------
   *                 +---------------> / InitializeSecurityContext /
   *                 |                 ----------------------------
   *                 |                               |
   *                 |                               |
   *                 |                              \|/
   *     ---------------------------        ---------+-------------            ----------------------
   *    / Receive blob from server /      < Received security blob? > --Yes-> / Send blob to server /
   *    -------------+-------------         -----------------------           ----------------------
   *                /|\                              |                                |
   *                 |                               No                               |
   *                Yes                             \|/                               |
   *                 |                   ------------+-----------                     |
   *                 +---------------- < Received Continue Needed > <-----------------+
   *                                     ------------------------
   *                                                 |
   *                                                 No
   *                                                \|/
   *                                           ------+-------
   *                                          (  Client End  )
   *                                           --------------
   */
  
  BOOL ntlm_authenticate(rdpNtlm* ntlm)
  {
  	SECURITY_STATUS status;
  
  	if (ntlm->outputBuffer[0].pvBuffer)
  	{
  		free(ntlm->outputBuffer[0].pvBuffer);
  		ntlm->outputBuffer[0].pvBuffer = NULL;
  	}
  
  	ntlm->outputBufferDesc.ulVersion = SECBUFFER_VERSION;
  	ntlm->outputBufferDesc.cBuffers = 1;
  	ntlm->outputBufferDesc.pBuffers = ntlm->outputBuffer;
  	ntlm->outputBuffer[0].BufferType = SECBUFFER_TOKEN;
  	ntlm->outputBuffer[0].cbBuffer = ntlm->cbMaxToken;
  	ntlm->outputBuffer[0].pvBuffer = malloc(ntlm->outputBuffer[0].cbBuffer);
  	if (!ntlm->outputBuffer[0].pvBuffer)
  		return FALSE;
  
  	if (ntlm->haveInputBuffer)
  	{
  		ntlm->inputBufferDesc.ulVersion = SECBUFFER_VERSION;
  		ntlm->inputBufferDesc.cBuffers = 1;
  		ntlm->inputBufferDesc.pBuffers = ntlm->inputBuffer;
  		ntlm->inputBuffer[0].BufferType = SECBUFFER_TOKEN;
  
  		if (ntlm->Bindings)
  		{
  			ntlm->inputBufferDesc.cBuffers++;
  			ntlm->inputBuffer[1].BufferType = SECBUFFER_CHANNEL_BINDINGS;
  			ntlm->inputBuffer[1].cbBuffer = ntlm->Bindings->BindingsLength;
  			ntlm->inputBuffer[1].pvBuffer = (void*) ntlm->Bindings->Bindings;
  		}
  	}
  
  	if ((!ntlm) || (!ntlm->table))
  	{
  		DEBUG_WARN( "ntlm_authenticate: invalid ntlm context\n");
  		return FALSE;
  	}
  
  	status = ntlm->table->InitializeSecurityContext(&ntlm->credentials,
  			(ntlm->haveContext) ? &ntlm->context : NULL,
  			(ntlm->ServicePrincipalName) ? ntlm->ServicePrincipalName : NULL,
  			ntlm->fContextReq, 0, SECURITY_NATIVE_DREP,
  			(ntlm->haveInputBuffer) ? &ntlm->inputBufferDesc : NULL,
  			0, &ntlm->context, &ntlm->outputBufferDesc,
  			&ntlm->pfContextAttr, &ntlm->expiration);
  
  	if ((status == SEC_I_COMPLETE_AND_CONTINUE) || (status == SEC_I_COMPLETE_NEEDED) || (status == SEC_E_OK))
  	{
  		if (ntlm->table->CompleteAuthToken != NULL)
  			ntlm->table->CompleteAuthToken(&ntlm->context, &ntlm->outputBufferDesc);
  
  		if (ntlm->table->QueryContextAttributes(&ntlm->context, SECPKG_ATTR_SIZES, &ntlm->ContextSizes) != SEC_E_OK)
  		{
  			DEBUG_WARN( "QueryContextAttributes SECPKG_ATTR_SIZES failure\n");
  			return FALSE;
  		}
  
  		if (status == SEC_I_COMPLETE_NEEDED)
  			status = SEC_E_OK;
  		else if (status == SEC_I_COMPLETE_AND_CONTINUE)
  			status = SEC_I_CONTINUE_NEEDED;
  	}
  
  	if (ntlm->haveInputBuffer)
  	{
  		free(ntlm->inputBuffer[0].pvBuffer);
  	}
  
  	ntlm->haveInputBuffer = TRUE;
  	ntlm->haveContext = TRUE;
  
  	return (status == SEC_I_CONTINUE_NEEDED) ? TRUE : FALSE;
  }
  
  void ntlm_client_uninit(rdpNtlm* ntlm)
  {
  	free(ntlm->identity.User);
  	free(ntlm->identity.Domain);
  	free(ntlm->identity.Password);
  	free(ntlm->ServicePrincipalName);
  
  	if (ntlm->table)
  	{
  		ntlm->table->FreeCredentialsHandle(&ntlm->credentials);
  		ntlm->table->FreeContextBuffer(ntlm->pPackageInfo);
  		ntlm->table->DeleteSecurityContext(&ntlm->context);
  	}
  }
  
  rdpNtlm* ntlm_new()
  {
  	return (rdpNtlm *)calloc(1, sizeof(rdpNtlm));
  }
  
  void ntlm_free(rdpNtlm* ntlm)
  {
  	if (ntlm != NULL)
  	{
  		free(ntlm);
  	}
  }
  