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windows-server-2003/shell/ext/ftp/passwordapi.cpp

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/*****************************************************************************\
FILE: passwordapi.cpp
DESCRIPTION:
We want to store FTP passwords in a secure API. We will use the
PStore APIs on WinNT and the PWL APIs on Win9x. This code was taken
from wininet.
BryanSt (Bryan Starbuck) - Created
BryanSt (Bryan Starbuck) - Updated to support DP API for Win2k
Copyright (c) 1998-2000 Microsoft Corporation
\*****************************************************************************/
#include "priv.h"
#include <pstore.h>
#include <wincrypt.h> // Defines DATA_BLOB
#include <passwordapi.h>
typedef HRESULT (*PFNPSTORECREATEINSTANCE)(IPStore**, PST_PROVIDERID*, VOID*, DWORD);
// Globals
#define SIZE_MAX_KEY_SIZE 2048 // For lookup key (In our case, URL w/user name & server, without password & path)
#define SIZE_MAX_VALUE_SIZE 2048 // For stored value (In our case the password)
// MPR.DLL exports used by top level API.
typedef DWORD (APIENTRY *PFWNETGETCACHEDPASSWORD) (LPCSTR, WORD, LPCSTR, LPWORD, BYTE);
typedef DWORD (APIENTRY *PFWNETCACHEPASSWORD) (LPCSTR, WORD, LPCSTR, WORD, BYTE, UINT);
typedef DWORD (APIENTRY *PFWNETREMOVECACHEDPASSWORD) (LPCSTR, WORD, BYTE);
// PWL related variables.
static HMODULE MhmodWNET = NULL;
static PFWNETGETCACHEDPASSWORD g_pfWNetGetCachedPassword = NULL;
static PFWNETCACHEPASSWORD g_pfWNetCachePassword = NULL;
static PFWNETREMOVECACHEDPASSWORD g_pfWNetRemoveCachedPassword = NULL;
// Pstore related variables.
static PFNPSTORECREATEINSTANCE s_pPStoreCreateInstance = NULL;
#define STR_FTP_CACHE_CREDENTIALS L"MS IE FTP Passwords";
#define PSTORE_MODULE TEXT("pstorec.dll")
#define WNETDLL_MODULE TEXT("mpr.dll")
#define WNETGETCACHEDPASS "WNetGetCachedPassword"
#define WNETCACHEPASS "WNetCachePassword"
#define WNETREMOVECACHEDPASS "WNetRemoveCachedPassword"
#define DISABLE_PASSWORD_CACHE 1
// PWL related defines.
// Password-cache-entry, this should be in PCACHE.
#define PCE_WWW_BASIC 0x13
// NOTE: We would logically like to unload the dll of the API we use (s_pPStoreCreateInstance) via FreeLibrary(PSTORE_MODULE),
// but we would need to do that when we unload our DLL. We can't do that because it leads to crashing
// and badness.
// Wininet uses this GUID for pstore:
// {5E7E8100-9138-11d1-945A-00C04FC308FF}
static const GUID GUID_PStoreType =
{ 0x5e7e8100, 0x9138, 0x11d1, { 0x94, 0x5a, 0x0, 0xc0, 0x4f, 0xc3, 0x8, 0xff } };
// Private function prototypes.
// PWL private function prototypes.
DWORD PWLSetCachedCredentials(LPCSTR pszKey, DWORD cbKey, LPCSTR pszCred, DWORD cbCred);
DWORD PWLGetCachedCredentials(LPCSTR pszKey, DWORD cbKey, LPSTR cbCred, LPDWORD pcbCred);
DWORD PWLRemoveCachedCredentials(LPCSTR pszKey, DWORD cbKey);
BOOL LoadWNet(VOID);
// PStore private function prototypes.
DWORD PStoreSetCachedCredentials(LPCWSTR pszKey, LPCWSTR pszCred, DWORD cbCred, BOOL fRemove=FALSE);
DWORD PStoreGetCachedCredentials(LPCWSTR pszKey, LPWSTR pszCred, LPDWORD pcbCred);
DWORD PStoreRemoveCachedCredentials(LPCWSTR pszKey);
HRESULT CreatePStore(IPStore **ppIPStore);
STDAPI ReleasePStore(IPStore *pIPStore);
#define FEATURE_USE_DPAPI
// The DPAPI is an improved version of PStore that started shipping in Win2k. This
// has better security and should be used when it is available. Pete Skelly informed
// me of this. CliffV also has a password credentials manager, but that probably wouldn't
// be applicable for FTP.
HRESULT DPAPISetCachedCredentials(IN LPCWSTR pszKey, IN LPCWSTR pszValue, IN OPTIONAL LPCWSTR pszDescription);
HRESULT DPAPIGetCachedCredentials(IN LPCWSTR pszKey, IN LPWSTR pszValue, IN int cchSize);
HRESULT DPAPIRemoveCachedCredentials(IN LPCWSTR pszKey);
// *--------------------------- Top Level APIs ---------------------------------*
/****************************************************\
FUNCTION: InitCredentialPersist
DESCRIPTION:
Try to init the cache.
PARAMETERS:
Return Value:
S_OK if it will work correctly.
S_FASE if turned off by admin.
HRESULT_FROM_WIN32(ERROR_PRODUCT_UNINSTALLED) if the password caching APIs aren't installed on NT.
\****************************************************/
HRESULT InitCredentialPersist(void)
{
HRESULT hr = S_OK;
DWORD dwDisable;
DWORD cbSize = sizeof(dwDisable);
// First check to see if persistence is disabled via registry.
if ((ERROR_SUCCESS == SHGetValue(HKEY_CURRENT_USER, SZ_REGKEY_INTERNET_SETTINGS, SZ_REGVALUE_DISABLE_PASSWORD_CACHE, NULL, (void *)&dwDisable, &cbSize))
&& (dwDisable == DISABLE_PASSWORD_CACHE))
{
// Persistence disabled via registry.
hr = S_FALSE;
}
if (S_OK == hr)
{
// We use PWL for Win95; this should be available.
if (!IsOS(OS_NT))
{
// hr already equals S_OK and no more work is needed.
}
else
{
HINSTANCE hInstPStoreC = 0;
// If is WinNT, check if PStore is installed.
hInstPStoreC = LoadLibrary(PSTORE_MODULE);
if (!hInstPStoreC)
hr = HRESULT_FROM_WIN32(ERROR_PRODUCT_UNINSTALLED);
else
{
// Get CreatePStoreInstance function pointer.
s_pPStoreCreateInstance = (PFNPSTORECREATEINSTANCE) GetProcAddress(hInstPStoreC, "PStoreCreateInstance");
if (!s_pPStoreCreateInstance)
hr = HRESULT_FROM_WIN32(ERROR_PRODUCT_UNINSTALLED);
else
{
IPStore * pIPStore = NULL;
// Create an IPStore.
hr = CreatePStore(&pIPStore);
// We just did this to see if it worked, so
// the hr was set correctly.
if (pIPStore)
ReleasePStore(pIPStore);
}
}
}
}
return hr;
}
/****************************************************\
FUNCTION: SetCachedCredentials
DESCRIPTION:
PARAMETERS:
\****************************************************/
HRESULT SetCachedCredentials(LPCWSTR pwzKey, LPCWSTR pwzValue)
{
// Check if credential persistence is available.
HRESULT hr = InitCredentialPersist();
if (S_OK == hr)
{
// Store credentials.
if (!IsOS(OS_NT))
{
// Use the PWL (Password List) API on Win9x
CHAR szKey[SIZE_MAX_KEY_SIZE];
CHAR szValue[SIZE_MAX_VALUE_SIZE];
ASSERT(lstrlenW(pwzKey) < ARRAYSIZE(szKey));
ASSERT(lstrlenW(pwzValue) < ARRAYSIZE(szValue));
SHUnicodeToAnsi(pwzKey, szKey, ARRAYSIZE(szKey));
SHUnicodeToAnsi(pwzValue, szValue, ARRAYSIZE(szValue));
DWORD cbKey = ((lstrlenA(szKey) + 1) * sizeof(szKey[0]));
DWORD cbCred = ((lstrlenA(szValue) + 1) * sizeof(szValue[0]));
// Store credentials using PWL.
DWORD dwError = PWLSetCachedCredentials(szKey, cbKey, szValue, cbCred);
hr = HRESULT_FROM_WIN32(dwError);
}
else
{
hr = E_FAIL;
#ifdef FEATURE_USE_DPAPI
if (5 <= GetOSVer())
{
// Use the DPAPI (Data Protection) API on Win2k and later.
// This has the latest and greatest in protection.
WCHAR wzDescription[MAX_URL_STRING];
wnsprintfW(wzDescription, ARRAYSIZE(wzDescription), L"FTP password for: %ls", pwzKey);
hr = DPAPISetCachedCredentials(pwzKey, pwzValue, wzDescription);
}
#endif // FEATURE_USE_DPAPI
if (FAILED(hr)) // Fall back to PStore in case DP is won't work unless we do UI.
{
// Use the PStore API on pre-Win2k.
DWORD cbCred = ((lstrlenW(pwzValue) + 1) * sizeof(pwzValue[0]));
// Store credentials using PStore.
DWORD dwError = PStoreSetCachedCredentials(pwzKey, pwzValue, cbCred);
hr = HRESULT_FROM_WIN32(dwError);
}
}
}
return hr;
}
/****************************************************\
FUNCTION: GetCachedCredentials
DESCRIPTION:
PARAMETERS:
\****************************************************/
HRESULT GetCachedCredentials(LPCWSTR pwzKey, LPWSTR pwzValue, DWORD cchSize)
{
// Check if credential persistence is available.
HRESULT hr = InitCredentialPersist();
if (S_OK == hr)
{
// Store credentials.
if (!IsOS(OS_NT))
{
// Use the PWL (Password List) API on Win9x
CHAR szKey[SIZE_MAX_KEY_SIZE];
CHAR szValue[SIZE_MAX_VALUE_SIZE];
DWORD cchTempSize = ARRAYSIZE(szValue);
ASSERT(lstrlenW(pwzKey) < ARRAYSIZE(szKey));
ASSERT(cchSize < ARRAYSIZE(szValue));
SHUnicodeToAnsi(pwzKey, szKey, ARRAYSIZE(szKey));
DWORD cbKey = ((lstrlenA(szKey) + 1) * sizeof(szKey[0]));
szValue[0] = 0;
// Store credentials using PWL.
DWORD dwError = PWLGetCachedCredentials(szKey, cbKey, szValue, &cchTempSize);
hr = HRESULT_FROM_WIN32(dwError);
SHAnsiToUnicode(szValue, pwzValue, cchSize);
}
else
{
hr = E_FAIL;
#ifdef FEATURE_USE_DPAPI
if (5 <= GetOSVer())
{
// Use the DPAPI (Data Protection) API on Win2k and later.
// This has the latest and greatest in protection.
hr = DPAPIGetCachedCredentials(pwzKey, pwzValue, cchSize);
}
#endif // FEATURE_USE_DPAPI
if (FAILED(hr)) // Fall back to PStore in case DP is won't work unless we do UI.
{
// Use the PStore API on pre-Win2k.
cchSize++; // Include terminator.
cchSize *= sizeof(pwzValue[0]);
pwzValue[0] = 0;
// Store credentials using PStore.
DWORD dwError = PStoreGetCachedCredentials(pwzKey, pwzValue, &cchSize);
hr = HRESULT_FROM_WIN32(dwError);
}
}
}
return hr;
}
/****************************************************\
FUNCTION: RemoveCachedCredentials
DESCRIPTION:
PARAMETERS:
\****************************************************/
HRESULT RemoveCachedCredentials(LPCWSTR pwzKey)
{
// Check if credential persistence is available.
HRESULT hr = InitCredentialPersist();
if (S_OK == hr)
{
// Store credentials.
if (!IsOS(OS_NT))
{
// Use the PWL (Password List) API on Win9x
CHAR szKey[SIZE_MAX_KEY_SIZE];
ASSERT(lstrlenW(pwzKey) < ARRAYSIZE(szKey));
SHUnicodeToAnsi(pwzKey, szKey, ARRAYSIZE(szKey));
DWORD cbKey = (lstrlenA(szKey) * sizeof(szKey[0]));
// Remove credentials from PWL.
DWORD dwError = PWLRemoveCachedCredentials(szKey, cbKey);
hr = HRESULT_FROM_WIN32(dwError);
}
else
{
hr = E_FAIL;
#ifdef FEATURE_USE_DPAPI
if (5 <= GetOSVer())
{
// Use the DPAPI (Data Protection) API on Win2k and later.
// This has the latest and greatest in protection.
hr = DPAPIRemoveCachedCredentials(pwzKey);
}
#endif // FEATURE_USE_DPAPI
if (FAILED(hr)) // Fall back to PStore in case DP is won't work unless we do UI.
{
// Remove credentials from PStore.
DWORD dwError = PStoreRemoveCachedCredentials(pwzKey);
hr = HRESULT_FROM_WIN32(dwError);
}
}
}
return hr;
}
/*--------------------------- PWL Functions ---------------------------------*/
/*-----------------------------------------------------------------------------
PWLSetCachedCredentials
---------------------------------------------------------------------------*/
DWORD PWLSetCachedCredentials(LPCSTR pszKey, DWORD cbKey,
LPCSTR pszCred, DWORD cbCred)
{
DWORD dwError;
// Load WNet.
if (!LoadWNet())
return ERROR_INTERNET_INTERNAL_ERROR;
// Store credentials.
dwError = (*g_pfWNetCachePassword) (pszKey, (WORD) cbKey, pszCred, (WORD) cbCred, PCE_WWW_BASIC, 0);
return dwError;
}
/*-----------------------------------------------------------------------------
PWLGetCachedCredentials
---------------------------------------------------------------------------*/
DWORD PWLGetCachedCredentials (LPCSTR pszKey, DWORD cbKey,
LPSTR pszCred, LPDWORD pcbCred)
{
DWORD dwError;
// Load WNet.
if (!LoadWNet())
return ERROR_INTERNET_INTERNAL_ERROR;
// Retrieve credentials.
dwError = (*g_pfWNetGetCachedPassword) (pszKey, (WORD) cbKey, pszCred,
(LPWORD) pcbCred, PCE_WWW_BASIC);
return dwError;
}
/*-----------------------------------------------------------------------------
PWLRemoveCachedCredentials
---------------------------------------------------------------------------*/
DWORD PWLRemoveCachedCredentials (LPCSTR pszKey, DWORD cbKey)
{
DWORD dwError;
// Load WNet.
if (!LoadWNet())
return ERROR_INTERNET_INTERNAL_ERROR;
dwError = (*g_pfWNetRemoveCachedPassword) (pszKey, (WORD) cbKey, PCE_WWW_BASIC);
return dwError;
}
// PWL utility functions.
/*-----------------------------------------------------------------------------
LoadWNet
---------------------------------------------------------------------------*/
BOOL LoadWNet(VOID)
{
BOOL fReturn;
// MPR.DLL already loaded.
if (MhmodWNET)
{
fReturn = TRUE;
goto quit;
}
// Load MPR.DLL
MhmodWNET = LoadLibrary(WNETDLL_MODULE);
// Fail if not loaded.
if (MhmodWNET)
{
fReturn = TRUE;
}
else
{
fReturn = FALSE;
goto quit;
}
g_pfWNetGetCachedPassword = (PFWNETGETCACHEDPASSWORD) GetProcAddress(MhmodWNET, WNETGETCACHEDPASS);
g_pfWNetCachePassword = (PFWNETCACHEPASSWORD) GetProcAddress(MhmodWNET, WNETCACHEPASS);
g_pfWNetRemoveCachedPassword = (PFWNETREMOVECACHEDPASSWORD) GetProcAddress(MhmodWNET, WNETREMOVECACHEDPASS);
// Ensure we have all function pointers.
if (!(g_pfWNetGetCachedPassword
&& g_pfWNetCachePassword
&& g_pfWNetRemoveCachedPassword))
{
fReturn = FALSE;
}
quit:
return fReturn;
}
/*------------------------- PStore Functions -------------------------------*/
/*-----------------------------------------------------------------------------
PStoreSetCachedCredentials
---------------------------------------------------------------------------*/
DWORD PStoreSetCachedCredentials(LPCWSTR pszKey, LPCWSTR pszCred, DWORD cbCred, BOOL fRemove)
{
ASSERT(s_pPStoreCreateInstance);
HRESULT hr;
DWORD dwError;
PST_TYPEINFO typeInfo;
PST_PROMPTINFO promptInfo = {0};
GUID itemType = GUID_PStoreType;
GUID itemSubtype = GUID_NULL;
IPStore * pStore = NULL;
// PST_TYPEINFO data.
typeInfo.cbSize = sizeof(typeInfo);
typeInfo.szDisplayName = STR_FTP_CACHE_CREDENTIALS;
// PST_PROMPTINFO data (no prompting desired).
promptInfo.cbSize = sizeof(promptInfo);
promptInfo.dwPromptFlags = 0;
promptInfo.hwndApp = NULL;
promptInfo.szPrompt = NULL;
// Create a PStore interface.
hr = CreatePStore(&pStore);
if (!SUCCEEDED(hr))
goto quit;
ASSERT(pStore != NULL);
// Create a type in HKCU.
hr = pStore->CreateType(PST_KEY_CURRENT_USER, &itemType, &typeInfo, 0);
if (!((SUCCEEDED(hr)) || (hr == PST_E_TYPE_EXISTS)))
goto quit;
// Create subtype.
hr = pStore->CreateSubtype(PST_KEY_CURRENT_USER, &itemType,
&itemSubtype, &typeInfo, NULL, 0);
if (!((SUCCEEDED(hr)) || (hr == PST_E_TYPE_EXISTS)))
goto quit;
// Valid credentials are written; No credentials imples
// that the key and credentials are to be deleted.
if (pszCred && cbCred && !fRemove)
{
// Write key and credentials to PStore.
hr = pStore->WriteItem(PST_KEY_CURRENT_USER,
&itemType,
&itemSubtype,
pszKey,
cbCred,
(LPBYTE) pszCred,
&promptInfo,
PST_CF_NONE,
0);
}
else
{
// Delete key and credentials from PStore.
hr = pStore->DeleteItem(PST_KEY_CURRENT_USER,
&itemType,
&itemSubtype,
pszKey,
&promptInfo,
0);
}
quit:
// Release the interface, convert error and return.
ReleasePStore(pStore);
if (SUCCEEDED(hr))
dwError = ERROR_SUCCESS;
else
dwError = ERROR_INTERNET_INTERNAL_ERROR;
return dwError;
}
/*-----------------------------------------------------------------------------
PStoreGetCachedCredentials
---------------------------------------------------------------------------*/
DWORD PStoreGetCachedCredentials(LPCWSTR pszKey, LPWSTR pszCred, LPDWORD pcbCred)
{
ASSERT(s_pPStoreCreateInstance);
HRESULT hr ;
DWORD dwError;
LPBYTE pbData;
PST_PROMPTINFO promptInfo = {0};
GUID itemType = GUID_PStoreType;
GUID itemSubtype = GUID_NULL;
IPStore* pStore = NULL;
// PST_PROMPTINFO data (no prompting desired).
promptInfo.cbSize = sizeof(promptInfo);
promptInfo.dwPromptFlags = 0;
promptInfo.hwndApp = NULL;
promptInfo.szPrompt = NULL;
// Create a PStore interface.
hr = CreatePStore(&pStore);
if (!SUCCEEDED(hr))
goto quit;
ASSERT(pStore != NULL);
// Read the credentials from PStore.
hr = pStore->ReadItem(PST_KEY_CURRENT_USER,
&itemType,
&itemSubtype,
pszKey,
pcbCred,
(LPBYTE*) &pbData,
&promptInfo,
0);
// Copy credentials and free buffer allocated by ReadItem.
if (SUCCEEDED(hr))
{
memcpy(pszCred, pbData, *pcbCred);
CoTaskMemFree(pbData);
//hr = S_OK;
}
quit:
// Release the interface, convert error and return.
ReleasePStore(pStore);
if (SUCCEEDED(hr))
dwError = ERROR_SUCCESS;
else
dwError = ERROR_INTERNET_INTERNAL_ERROR;
return dwError;
}
/*-----------------------------------------------------------------------------
PStoreRemoveCachedCredentials
---------------------------------------------------------------------------*/
DWORD PStoreRemoveCachedCredentials(LPCWSTR pszKey)
{
// Pass in TRUE to remove credentials.
return PStoreSetCachedCredentials(pszKey, NULL, 0, TRUE);
}
// PStore utility functions
/*-----------------------------------------------------------------------------
CreatePStore
---------------------------------------------------------------------------*/
HRESULT CreatePStore(IPStore **ppIPStore)
{
return s_pPStoreCreateInstance (ppIPStore, NULL, NULL, 0);
}
/*-----------------------------------------------------------------------------
ReleasePStore
---------------------------------------------------------------------------*/
STDAPI ReleasePStore(IPStore *pIPStore)
{
HRESULT hr;
if (pIPStore)
{
pIPStore->Release();
hr = S_OK;
}
else
{
hr = E_POINTER;
}
return hr;
}
/*--------------------------- DP (Data Protection) Functions ---------------------------------*/
void ClearDataBlob(DATA_BLOB * pdbBlobToFree)
{
if (pdbBlobToFree && pdbBlobToFree->pbData)
{
LocalFree(pdbBlobToFree->pbData);
}
}
/*-----------------------------------------------------------------------------
PWLSetCachedCredentials
---------------------------------------------------------------------------*/
HRESULT DPAPISetCachedCredentials(IN LPCWSTR pszKey, IN LPCWSTR pszValue, IN OPTIONAL LPCWSTR pszDescription)
{
HRESULT hr = S_OK;
DATA_BLOB dbEncrypted = {0};
DATA_BLOB dbUnencrypted;
dbUnencrypted.pbData = (unsigned char *) pszValue;
dbUnencrypted.cbData = ((lstrlenW(pszValue) + 1) * sizeof(pszValue[0]));
if (!_CryptProtectData(&dbUnencrypted, pszDescription, NULL, NULL, NULL, CRYPTPROTECT_UI_FORBIDDEN, &dbEncrypted))
{
hr = HRESULT_FROM_WIN32(GetLastError()); // It failed, so get the real err value.
}
else
{
WCHAR wzDPKey[MAX_URL_STRING+MAX_PATH];
wnsprintfW(wzDPKey, ARRAYSIZE(wzDPKey), L"DPAPI: %ls", pszKey);
AssertMsg((NULL != dbEncrypted.pbData), TEXT("If the API succeeded but they didn't give us the encrypted version. -BryanSt"));
// Use the PStore to actually store the data, but we use a different key.
DWORD dwError = PStoreSetCachedCredentials(wzDPKey, (LPCWSTR)dbEncrypted.pbData, dbEncrypted.cbData);
hr = HRESULT_FROM_WIN32(dwError);
}
ClearDataBlob(&dbEncrypted);
return hr;
}
#define MAX_ENCRYPTED_PASSWORD_SIZE 20*1024 // The DP API should be able to store our tiny encrypted password into 20k.
/*-----------------------------------------------------------------------------
PWLGetCachedCredentials
---------------------------------------------------------------------------*/
HRESULT DPAPIGetCachedCredentials(IN LPCWSTR pszKey, IN LPWSTR pszValue, IN int cchSize)
{
HRESULT hr = E_OUTOFMEMORY;
DATA_BLOB dbEncrypted = {0};
dbEncrypted.pbData = (unsigned char *) LocalAlloc(LPTR, MAX_ENCRYPTED_PASSWORD_SIZE);
dbEncrypted.cbData = MAX_ENCRYPTED_PASSWORD_SIZE;
StrCpyNW(pszValue, L"", cchSize); // Init the buffer in case of an error.
if (dbEncrypted.pbData)
{
WCHAR wzDPKey[MAX_URL_STRING+MAX_PATH];
// Use the PStore to actually store the data, but we use a different key.
wnsprintfW(wzDPKey, ARRAYSIZE(wzDPKey), L"DPAPI: %ls", pszKey);
DWORD dwError = PStoreGetCachedCredentials(wzDPKey, (LPWSTR)dbEncrypted.pbData, &dbEncrypted.cbData);
hr = HRESULT_FROM_WIN32(dwError);
if (SUCCEEDED(hr))
{
DATA_BLOB dbUnencrypted = {0};
if (_CryptUnprotectData(&dbEncrypted, NULL, NULL, NULL, NULL, CRYPTPROTECT_UI_FORBIDDEN, &dbUnencrypted))
{
StrCpyNW(pszValue, (LPCWSTR)dbUnencrypted.pbData, cchSize); // Init the buffer in case of an error.
ClearDataBlob(&dbUnencrypted);
}
else
{
hr = HRESULT_FROM_WIN32(GetLastError()); // It failed, so get the real err value.
}
}
LocalFree(dbEncrypted.pbData);
}
return hr;
}
/*-----------------------------------------------------------------------------
PWLRemoveCachedCredentials
---------------------------------------------------------------------------*/
HRESULT DPAPIRemoveCachedCredentials(IN LPCWSTR pszKey)
{
WCHAR wzDPKey[MAX_URL_STRING+MAX_PATH];
wnsprintfW(wzDPKey, ARRAYSIZE(wzDPKey), L"DPAPI: %ls", pszKey);
DWORD dwError = PStoreRemoveCachedCredentials(wzDPKey);
return HRESULT_FROM_WIN32(dwError);
}