////////////////////////////////////////////////////////////////////////////// // // Copyright (c) 1998,1999,2000 Microsoft Corporation. All Rights Reserved. // // SYSTEM: Windows Update Critical Fix Notification // // CLASS: N/A // MODULE: MS Cab Trusting Function Implementation // FILE: Newtrust.CPP // ///////////////////////////////////////////////////////////////////// // // DESC: this file implements the functions used by class CTrust // these function are copied from inseng.dll of IE5 Active Setup. // // // AUTHOR: Alessandro Muti, Windows Update Team // DATE: 3/11/1999 // ///////////////////////////////////////////////////////////////////// // // Revision History: // // Date Author Description // ~~~~ ~~~~~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // 10/17/2000 Nick Dallett Porting Charlma's new cert-checking code from SLM tree: // (8/28/00 Charles Ma Rewrite CheckMSCert() function to handle certs with MS root and special cases ) // ///////////////////////////////////////////////////////////////////// // // (c) Copyrights: 1998, 1999, 2000 Microsoft Corporation // // All rights reserved. // // No portion of this source code may be reproduced // without express written permission of Microsoft Corporation. // // This source code is proprietary and confidential. ///////////////////////////////////////////////////////////////////// #include #include #include #include #include //#include #include #include #include "cdmlibp.h" #include "newtrust.h" #define LOGGING_LEVEL 3 #include //*********************************************************************************// // Global UNICODE<>ANSI translation helpers //*********************************************************************************// #include // for _alloca #define USES_CONVERSION int _convert = 0; _convert; UINT _acp = CP_ACP; _acp; LPCWSTR _lpw = NULL; _lpw; LPCSTR _lpa = NULL; _lpa inline LPWSTR WINAPI AtlA2WHelper(LPWSTR lpw, LPCSTR lpa, int nChars, UINT acp) { // // verify that no illegal character present // since lpw was allocated based on the size of lpa // don't worry about the number of chars // lpw[0] = '\0'; MultiByteToWideChar(acp, 0, lpa, -1, lpw, nChars); return lpw; } inline LPSTR WINAPI AtlW2AHelper(LPSTR lpa, LPCWSTR lpw, int nChars, UINT acp) { // // verify that no illegal character present // since lpa was allocated based on the size of lpw // don't worry about the number of chars // lpa[0] = '\0'; WideCharToMultiByte(acp, 0, lpw, -1, lpa, nChars, NULL, NULL); return lpa; } #define A2W(lpa) (\ ((_lpa = lpa) == NULL) ? NULL : (\ _convert = (lstrlenA(_lpa)+1),\ AtlA2WHelper((LPWSTR)_alloca(_convert*2), _lpa, _convert, CP_ACP))) #define W2A(lpw) (\ ((_lpw = lpw) == NULL) ? NULL : (\ _convert = (lstrlenW(_lpw)+1)*2,\ AtlW2AHelper((LPSTR)_alloca(_convert), _lpw, _convert, CP_ACP))) #define A2CW(lpa) ((LPCWSTR)A2W(lpa)) #define W2CA(lpw) ((LPCSTR)W2A(lpw)) #ifdef _UNICODE #define T2A W2A #define A2T A2W inline LPWSTR T2W(LPTSTR lp) { return lp; } inline LPTSTR W2T(LPWSTR lp) { return lp; } #define T2CA W2CA #define A2CT A2CW inline LPCWSTR T2CW(LPCTSTR lp) { return lp; } inline LPCTSTR W2CT(LPCWSTR lp) { return lp; } #else #define T2W A2W #define W2T W2A inline LPSTR T2A(LPTSTR lp) { return lp; } inline LPTSTR A2T(LPSTR lp) { return lp; } #define T2CW A2CW #define W2CT W2CA inline LPCSTR T2CA(LPCTSTR lp) { return lp; } inline LPCTSTR A2CT(LPCSTR lp) { return lp; } #endif #define OLE2T(p) W2T(p) #define T2OLE(p) T2W(p) ///////////////////////////////////////////////////////////////////////////// // // typedefs for APIs used in the CheckTrust() function // // Since some of these APIs are new and only available on IE5 we have to // try to dynamicaly use them when available and do without the extra checks // when we are on an OS that has not been upgraded to the new crypto code. // ///////////////////////////////////////////////////////////////////////////// const TCHAR WINTRUST[] = _T("wintrust.dll"); const TCHAR CRYPT32[] = _T("crypt32.dll"); // // declare a global crypt32.dll library handler, so we don't // need to load the library every time these functions are called. // NOTE: we do not release the library though. When the process of // calling this feature exits, the library is released. // same as wintrust.dll // static HINSTANCE shWinTrustDllInst = NULL; static HINSTANCE shCrypt32DllInst = NULL; // // define prototype for function WinVerifyTrust() // and declare a global variable to point to this function // typedef HRESULT (WINAPI * PFNWinVerifyTrust)( HWND hwnd, GUID *ActionID, LPVOID ActionData); PFNWinVerifyTrust pfnWinVerifyTrust = NULL; // // define prototype for function WTHelperProvDataFromStateData() // and declare a global variable to point to this function // typedef CRYPT_PROVIDER_DATA * (WINAPI * PFNWTHelperProvDataFromStateData)( HANDLE hStateData); PFNWTHelperProvDataFromStateData pfnWTHelperProvDataFromStateData = NULL; // // define prototype for function WTHelperGetProvSignerFromChain() // and declare a global variable to point to this function // typedef CRYPT_PROVIDER_SGNR * (WINAPI * PFNWTHelperGetProvSignerFromChain)( CRYPT_PROVIDER_DATA *pProvData, DWORD idxSigner, BOOL fCounterSigner, DWORD idxCounterSigner); PFNWTHelperGetProvSignerFromChain pfnWTHelperGetProvSignerFromChain = NULL; // // define prototype for function PFNWTHelperGetProvCertFromChain() // and declare a global variable to point to this function // typedef CRYPT_PROVIDER_CERT * (WINAPI * PFNWTHelperGetProvCertFromChain)( CRYPT_PROVIDER_SGNR *pSgnr, DWORD idxCert); PFNWTHelperGetProvCertFromChain pfnWTHelperGetProvCertFromChain = NULL; // // define prototype for function CryptHashPublicKeyInfo() // and declare a global variable to point to this function // typedef BOOL (WINAPI * PFNCryptHashPublicKeyInfo)( HCRYPTPROV hCryptProv, ALG_ID Algid, DWORD dwFlags, DWORD dwCertEncodingType, PCERT_PUBLIC_KEY_INFO pInfo, BYTE *pbComputedHash, DWORD *pcbComputedHash); PFNCryptHashPublicKeyInfo pfnCryptHashPublicKeyInfo = NULL; // // define prototype for function CertGetCertificateContextProperty() // and declare a global variable to point to this function // typedef BOOL (WINAPI * PFNCertGetCertificateContextProperty)( PCCERT_CONTEXT pCertContext, DWORD dwPropId, void *pvData, DWORD *pcbData); PFNCertGetCertificateContextProperty pfnCertGetCertificateContextProperty = NULL; ///////////////////////////////////////////////////////////////////////////// // // pre-defined cert data to check against // ///////////////////////////////////////////////////////////////////////////// // // The following is the sha1 key identifier for the Microsoft root // static BYTE rgbSignerRootKeyId[20] = { 0x4A, 0x5C, 0x75, 0x22, 0xAA, 0x46, 0xBF, 0xA4, 0x08, 0x9D, 0x39, 0x97, 0x4E, 0xBD, 0xB4, 0xA3, 0x60, 0xF7, 0xA0, 0x1D }; // // define the size of each hash values in the known id buffer // for special certs. // //static size_t rgbSpecialCertIdSize[5] = {20, 20, 20, 20, 20}; // // this is the size of buffer to receive the cert hash value // it must be not less than the largest number in the // above-defined array // const size_t ShaBufSize = 20; // // id buffer to store hash values of all special certs // Warning: the size of this buffer should match the sum // of size_t values defined above. // static BYTE rgbSpecialCertId[200] = { 0xB1,0x59,0xA5,0x2E,0x3D,0xD8,0xCE,0xCD,0x3A,0x9A,0x4A,0x7A,0x73,0x92,0xAA,0x8D,0xA7,0xE7,0xD6,0x7F, // MS cert 0xB1,0xC7,0x75,0xE0,0x4A,0x9D,0xFD,0x23,0xB6,0x18,0x97,0x11,0x5E,0xF6,0xEA,0x6B,0x99,0xEC,0x76,0x1D, // MSN cert 0x11,0xC7,0x10,0xF3,0xCB,0x6C,0x43,0xE1,0x66,0xEC,0x64,0x1C,0x7C,0x01,0x17,0xC4,0xB4,0x10,0x35,0x30, // MSNBC cert 0x95,0x25,0x58,0xD4,0x07,0xDE,0x4A,0xFD,0xAE,0xBA,0x13,0x72,0x83,0xC2,0xB3,0x37,0x04,0x90,0xC9,0x8A, // MSN Europe 0x72,0x54,0x14,0x91,0x1D,0x6E,0x10,0x84,0x8E,0x0F,0xFA,0xA0,0xB0,0xA1,0x65,0xBF,0x44,0x8F,0x9F,0x6D, // MS Europe 0x20,0x5E,0x48,0x43,0xAB,0xAD,0x54,0x77,0x71,0xBD,0x8D,0x1A,0x3C,0xE0,0xE5,0x9D,0xF5,0xBD,0x25,0xF9, // Old MS cert: 97~98 0xD6,0xCD,0x01,0x90,0xB3,0x1B,0x31,0x85,0x81,0x12,0x23,0x14,0xB5,0x17,0xA0,0xAA,0xCE,0xF2,0x7B,0xD5, // Old MS cert: 98~99 0x8A,0xA1,0x37,0xF5,0x03,0x9F,0xE0,0x28,0xC9,0x26,0xAA,0x55,0x90,0x14,0x19,0x68,0xFA,0xFF,0xE8,0x1A, // Old MS cert: 99~00 0xF3,0x25,0xF8,0x67,0x07,0x29,0xE5,0x27,0xF3,0x77,0x52,0x34,0xE0,0x51,0x57,0x69,0x0F,0x40,0xC6,0x1C, // Old MS Europe cert: 99~00 0x6A,0x71,0xFE,0x54,0x8A,0x51,0x08,0x70,0xF9,0x8A,0x56,0xCA,0x11,0x55,0xF6,0x76,0x45,0x92,0x02,0x5A // Old MS Europe cert: 98~99 }; ///////////////////////////////////////////////////////////////////////////// // // Private Function ULONG CompareMem(PVOID pBlock1, PVOID pBlock2, ULONG Length) // // This function acts in the same way as RtlCompareMemory() // // // Input: two pointers to two memory blocks, and a byte size to compare // Return: the number of bytes that compared as equal. // If all bytes compare as equal, the input Length is returned. // If any pointer is NULL, 0 is returned. // ///////////////////////////////////////////////////////////////////////////// ULONG CompareMem(const BYTE* pBlock1, const BYTE* pBlock2, ULONG Length) { ULONG uLen = 0L; if (pBlock1 != NULL && pBlock2 != NULL) { for (; uLen < Length; uLen++, pBlock1++, pBlock2++) { if (*pBlock1 != *pBlock2) return uLen; } } return uLen; } ///////////////////////////////////////////////////////////////////////////// // // Private Function VerifyMSRoot() // // This function takes the passed-in certificate as a root cert, // and verifies its public key hash value is the same as // known "Microsoft Root Authority" cert value. // // // Input: hCrypt32DllInst - handle point to loaded crypt32.dll library // pRootCert - the certificate context of the root cert // // Return: HRESULT - result of execution, S_OK if matched. // the result code, in case of error, are code retuned by // crypt32.dll, with these the exception of E_INVALIDARG if // the passed-in parameters are NULL. // ///////////////////////////////////////////////////////////////////////////// HRESULT VerifyMSRoot( HINSTANCE hCrypt32DllInst, // handle point to loaded crypt32.dll librar PCCERT_CONTEXT pRootCert ) { HRESULT hr = S_OK; BYTE rgbKeyId[sizeof(rgbSignerRootKeyId)]; DWORD cbKeyId = sizeof(rgbSignerRootKeyId); LOG_block("VerifyMSRoot()"); // // valid parameter values // if (NULL == hCrypt32DllInst || NULL == pRootCert) { hr = E_INVALIDARG; goto ErrHandler; } // // get the function we need from the passed in library handle // If not available, return error // if (NULL == (pfnCryptHashPublicKeyInfo = (PFNCryptHashPublicKeyInfo) GetProcAddress(hCrypt32DllInst, "CryptHashPublicKeyInfo"))) { hr = HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION); goto ErrHandler; } // // get the public key hash value of this cert // ZeroMemory(rgbKeyId, sizeof(rgbKeyId)); if (!pfnCryptHashPublicKeyInfo( 0, // use default crypto svc provider CALG_SHA1, // use SHA algorithm 0, // dwFlags X509_ASN_ENCODING, &pRootCert->pCertInfo->SubjectPublicKeyInfo, rgbKeyId, &cbKeyId )) { hr = HRESULT_FROM_WIN32(GetLastError()); goto ErrHandler; } // // compare the hash value of public key of this root cert with the known MS root cert value // if (sizeof(rgbSignerRootKeyId) != cbKeyId || cbKeyId != CompareMem(rgbSignerRootKeyId, rgbKeyId, cbKeyId)) { hr = S_FALSE; } ErrHandler: if (FAILED(hr)) { LOG_out("Faied inside function VerifyMSRoot() with HRESULT 0x%0x", hr); } else { LOG_out("Exit VerifyMSRoot() with %s", (S_OK == hr) ? "S_OK" : "S_FALSE"); } return hr; } ///////////////////////////////////////////////////////////////////////////// // // Private Function VerifySpecialMSCerts() // // This function takes the passed-in certificate as a leaf cert, // and verifies its hash value matches the hash value of one of // known Microsoft special certs that does not have MS root. // // The known certs are, in comparing order: // Microsoft Corporation // Microsoft Corporation MSN // MSNBC Interactive News LLC // Microsoft Corporation MSN (Europe) // Microsoft Corporation (Europe) // // // Input: hCrypt32DllInst - handle point to loaded crypt32.dll library // pRootCert - the certificate context of the root cert // // Return: HRESULT - result of execution, S_OK if matched. // if not matched, CERT_E_UNTRUSTEDROOT, or // E_INVALIDARG if arguments not right, or // crypt32.dll error returned by API calls // ///////////////////////////////////////////////////////////////////////////// HRESULT VerifySpecialMSCerts( HINSTANCE hCrypt32DllInst, // handle point to loaded crypt32.dll librar PCCERT_CONTEXT pLeafCert ) { HRESULT hr = S_FALSE; BYTE btShaBuffer[ShaBufSize]; DWORD dwSize = sizeof(btShaBuffer); LPBYTE pId; int i; LOG_block("VerifySpecialMSCerts()"); // // valid parameter values // if (NULL == hCrypt32DllInst || NULL == pLeafCert) { hr = E_INVALIDARG; goto ErrHandler; } // // get the function we need from the passed in library handle // If not available, return error // if (NULL == (pfnCertGetCertificateContextProperty = (PFNCertGetCertificateContextProperty) GetProcAddress(hCrypt32DllInst, "CertGetCertificateContextProperty"))) { hr = HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION); goto ErrHandler; } // // find out the id hash of leaf cert // ZeroMemory(btShaBuffer, dwSize); if (!pfnCertGetCertificateContextProperty( pLeafCert, // pCertContext CERT_SHA1_HASH_PROP_ID, // dwPropId btShaBuffer, &dwSize )) { hr = GetLastError(); goto ErrHandler; } // // iterrate through all known id hash values to see if this file is signed // with any of these special certs. // if (ShaBufSize == dwSize) { for (i = 0,pId = rgbSpecialCertId; i < sizeof(rgbSpecialCertId)/ShaBufSize; i++, pId += ShaBufSize) { if (CompareMem(btShaBuffer, pId, ShaBufSize) == ShaBufSize) { // // found a matching known cert! // hr = S_OK; break; } } } ErrHandler: if (FAILED(hr)) { LOG_out("Faied inside function VerifySpecialMSCerts() with HRESULT 0x%0x", hr); } else { LOG_out("Exit VerifySpecialMSCerts() with %s", (S_OK == hr) ? "S_OK" : "S_FALSE"); } return hr; } ///////////////////////////////////////////////////////////////////////////// // // Private Function CheckWinTrust() // // This function will return the HRESULT for the trust state on the // specified file. The file can be pointing to any URL or local file. // The verification will be done by the wintrust.dll. // // // Input: Fully qualified filename, UIChoice // Return: HRESULT - result of execution // ///////////////////////////////////////////////////////////////////////////// HRESULT CheckWinTrust(LPCTSTR pszFileName, DWORD dwUIChoice) { LOG_block("CheckWinTrust()"); USES_CONVERSION; // Now verify the file WINTRUST_DATA winData; WINTRUST_FILE_INFO winFile; GUID gAction = WINTRUST_ACTION_GENERIC_VERIFY_V2; CRYPT_PROVIDER_DATA const *pProvData = NULL; CRYPT_PROVIDER_SGNR *pProvSigner = NULL; CRYPT_PROVIDER_CERT *pProvCert = NULL; HRESULT hr = S_OK; #ifdef _WUV3TEST // // handling test case: // if a reg key value is set to 1, then we will see if we need to pop up ALL certs // // NOTE: // // for the certs that user has checked "Always trust this provider..." previously, // WinCheckTrust() API will still NOT show any UI even if we signal Show-ALL flag // HKEY hkey; DWORD dwWinTrustUI = 0; DWORD dwSize = sizeof(dwWinTrustUI); if (NO_ERROR == RegOpenKeyEx(HKEY_LOCAL_MACHINE, REGKEY_WUV3TEST, 0, KEY_READ, &hkey)) { RegQueryValueEx(hkey, _T("WinTrustUI"), 0, 0, (LPBYTE)&dwWinTrustUI, &dwSize); RegCloseKey(hkey); } if (1 == dwWinTrustUI && WTD_UI_NONE != dwUIChoice) { // // if there is a WinTrustUI reg key exist, and value is 1 // and caller does not request silence, then we // pop up all certs // dwUIChoice = WTD_UI_ALL; } #endif // // dynamically load the wintrust.dll // if (NULL == shWinTrustDllInst) { if (NULL == (shWinTrustDllInst = LoadLibrary(WINTRUST))) { LOG_error("Failed to load libary %s, exit function.", WINTRUST); hr = HRESULT_FROM_WIN32(GetLastError()); goto Done; } } // // dynamically load the crypt32.dll, which will be used by the two // helper functions to verify the cert is MS cert // if (NULL == shCrypt32DllInst) { if (NULL == (shCrypt32DllInst = LoadLibrary(CRYPT32))) { LOG_error("Failed to load libary %s, exit function.", CRYPT32); hr = HRESULT_FROM_WIN32(GetLastError()); goto Done; } } // // find the functions we need // if (NULL == (pfnWinVerifyTrust = (PFNWinVerifyTrust) GetProcAddress(shWinTrustDllInst, "WinVerifyTrust")) || NULL == (pfnWTHelperProvDataFromStateData = (PFNWTHelperProvDataFromStateData) GetProcAddress(shWinTrustDllInst, "WTHelperProvDataFromStateData")) || NULL == (pfnWTHelperGetProvSignerFromChain = (PFNWTHelperGetProvSignerFromChain) GetProcAddress(shWinTrustDllInst, "WTHelperGetProvSignerFromChain")) || NULL == (pfnWTHelperGetProvCertFromChain = (PFNWTHelperGetProvCertFromChain) GetProcAddress(shWinTrustDllInst, "WTHelperGetProvCertFromChain"))) { // // at least one function was not found in the loaded cryp32.dll libary. // we can not continue, jsut quit. // NOTE: this shouldn't happen since we have tried to get // the least common denomination of different version of this dll // on both IE4 and IE5 // LOG_error("CheckWinTrust() did not find functions needed from %s", CRYPT32); hr = HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION); goto Done; } // // initialize the data structure used to verify trust // winFile.cbStruct = sizeof(WINTRUST_FILE_INFO); winFile.hFile = INVALID_HANDLE_VALUE; winFile.pcwszFilePath = T2OLE((LPTSTR)pszFileName); winFile.pgKnownSubject = NULL; winData.cbStruct = sizeof(WINTRUST_DATA); winData.pPolicyCallbackData = NULL; winData.pSIPClientData = NULL; winData.dwUIChoice = (WTD_UI_ALL == dwUIChoice) ? dwUIChoice : WTD_UI_NONE; winData.fdwRevocationChecks = 0; winData.dwUnionChoice = WTD_CHOICE_FILE; winData.dwStateAction = WTD_STATEACTION_VERIFY; winData.hWVTStateData = 0; winData.dwProvFlags = 0x00000010; winData.pFile = &winFile; // // verify the signature // hr = pfnWinVerifyTrust( (HWND)0, &gAction, &winData); if (FAILED(hr)) { // // The object isn't even trusted so just get out here // LOG_error("WinVerifyTrust(%s) found error 0x%0x.", pszFileName, hr); goto Return; } // // the real usage should never pass in WTD_UI_ALL. If this is the case, // then we are calling this recursively in order to force the show // a good but non-MS cert only, so no need to check MS cert again. // // or, in test mode, we always do this part // if (WTD_UI_ALL != dwUIChoice) { // // the rset of code is used to verify the signed cert is // a valid MS cert. // pProvData = pfnWTHelperProvDataFromStateData(winData.hWVTStateData); pProvSigner = pfnWTHelperGetProvSignerFromChain( (PCRYPT_PROVIDER_DATA) pProvData, 0, // first signer FALSE, // not a counter signer 0); // // check root cert then check leaf (signing) cert if that fails // // 0 is signing cert, csCertChain-1 is root cert // pProvCert = pfnWTHelperGetProvCertFromChain(pProvSigner, pProvSigner->csCertChain - 1); hr = VerifyMSRoot(shCrypt32DllInst, pProvCert->pCert); if (S_OK != hr) { pProvCert = pfnWTHelperGetProvCertFromChain(pProvSigner, 0); hr = VerifySpecialMSCerts(shCrypt32DllInst, pProvCert->pCert); } } Return: // // free the wintrust state that was used to get the cert in the chain // winData.dwStateAction = WTD_STATEACTION_CLOSE; pfnWinVerifyTrust( (HWND)0, &gAction, &winData); //#ifndef _WUV3TEST // // recursively call this function if not in test mode so we can show // UI for this non-MS but good cert. // Only the two functions checking MS cert will return S_FALSE // if (S_OK != hr) { if (WTD_UI_NOGOOD == dwUIChoice) { // // we need to show UI, so we will have to call this thing again // in case this is not a MS cert. From UI, if user clicks YES // then the return value will be S_OK; // hr = CheckWinTrust(pszFileName, WTD_UI_ALL); LOG_error("CheckWinTrust() found file not signed by a known MS cert. If user has not checked \"Always trust this\", UI should be shown, and user selected %s", SUCCEEDED(hr) ? "YES" : "NO"); } else { LOG_error("CheckWinTrust() found file not signed by a known MS cert!"); hr = TRUST_E_SUBJECT_NOT_TRUSTED; } } //#endif if (WTD_UI_ALL != dwUIChoice) { if (FAILED(hr)) { LOG_error("CheckWinTrust(%s) returns 0x%0x", T2CA(pszFileName), hr); } else { LOG_out("CheckWinTrust(%s) returns S_OK", T2CA(pszFileName)); } } Done: if (NULL != shWinTrustDllInst) { FreeLibrary(shWinTrustDllInst); shWinTrustDllInst = NULL; } if (NULL != shCrypt32DllInst) { FreeLibrary(shCrypt32DllInst); shCrypt32DllInst = NULL; } return (hr); } ///////////////////////////////////////////////////////////////////////////// // // Public Function VerifyFile() // // This is a wrapper function for CheckWinTrust that both Whistler // and WU classic code should use. // // Input: szFileName - the file with complete path // fShowBadUI - whether pop up UI in cases // (1) inproperly signed signature, // (2) properly signed but not Microsoft signature // // Return: HRESULT - S_OK the file is signed with a valid MS cert // or error code. // // Note: If _WUV3TEST flag is set (for test build), then fShowBadUI is // ignored: // if reg key SOFTWARE\Microsoft\Windows\CurrentVersion\WindowsUpdate\wuv3test\WinTrustUI // is set to 1, then no UI is shown, and this function always return S_OK; // otherwise, UI always show no matter what cert, and return value is same // as the live build. // ///////////////////////////////////////////////////////////////////////////// HRESULT VerifyFile( IN LPCTSTR szFileName, BOOL fShowBadUI /* = TRUE */ ) { DWORD dwUIChoice = WTD_UI_NOGOOD; if (!fShowBadUI) { dwUIChoice = WTD_UI_NONE; } return CheckWinTrust(szFileName, dwUIChoice); }