/*++

Copyright (c) 1998  Microsoft Corporation

Module Name:

    persist.cxx

Abstract:

Author:

    Adriaan Canter (adriaanc) 13-Jan-1998

Revision History:

    13-Jan-1998 adriaanc
        Created

--*/

#include <wininetp.h>
#include <persist.h>

typedef HRESULT (*PFNPSTORECREATEINSTANCE)(IPStore**, PST_PROVIDERID*, VOID*, DWORD);

// Globals

// PWL related variables.
static HMODULE MhmodWNET                                     = NULL;
static PFWNETGETCACHEDPASSWORD pfWNetGetCachedPassword       = NULL;
static PFWNETCACHEPASSWORD pfWNetCachePassword               = NULL;
static PFWNETREMOVECACHEDPASSWORD pfWNetRemoveCachedPassword = NULL;

// Pstore related variables.
static PST_PROVIDERID s_provID                       = GUID_NULL;
static WCHAR c_szWininetCacheCredentials[]           = L"WininetCacheCredentials";
static PFNPSTORECREATEINSTANCE pPStoreCreateInstance = NULL;


// Webcheck is currently using this GUID for pstore:
// {14D96C20-255B-11d1-898F-00C04FB6BFC4}
// static const GUID GUID_PStoreType = { 0x14d96c20, 0x255b, 0x11d1, { 0x89, 0x8f, 0x0, 0xc0, 0x4f, 0xb6, 0xbf, 0xc4 } };

// 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(LPSTR szKey, DWORD cbKey, LPSTR szCred, DWORD cbCred);
DWORD PWLGetCachedCredentials  (LPSTR szKey, DWORD cbKey, LPSTR cbCred, LPDWORD pcbCred);
DWORD PWLRemoveCachedCredentials  (LPSTR szKey, DWORD cbKey);

BOOL LoadWNet(VOID);


// PStore private function prototypes.
DWORD PStoreSetCachedCredentials(LPSTR szKey, DWORD cbKey, LPSTR szCred, DWORD cbCred, BOOL fRemove=FALSE);
DWORD PStoreGetCachedCredentials(LPSTR szKey, DWORD cbKey, LPSTR szCred, LPDWORD pcbCred);
DWORD PStoreRemoveCachedCredentials(LPSTR szKey, DWORD cbKey);

STDAPI CreatePStore (IPStore **ppIPStore);
STDAPI ReleasePStore(IPStore  *pIPStore);


/*--------------------------- Top Level APIs ---------------------------------*/


BOOL ReadLSARegistryDword( CHAR* lpszValueName, DWORD* pdwValue)
{
    BOOL bRetVal = FALSE;
    HKEY key;
    DWORD dwType;

    if ( RegOpenKeyEx(
            HKEY_LOCAL_MACHINE,
            "SYSTEM\\CurrentControlSet\\Control\\Lsa",
            0,
            KEY_READ,
            &key) == ERROR_SUCCESS)
    {
        
        DWORD dwSize = sizeof(DWORD);
        if ( RegQueryValueEx(
                key,
                lpszValueName,
                NULL,
                &dwType,
                (LPBYTE)pdwValue,
                &dwSize ) == ERROR_SUCCESS )
        {
            bRetVal = TRUE;
        }


        RegCloseKey(key);

    }

    return bRetVal;

}

/*-----------------------------------------------------------------------------
    InetInitCredentialPersist
  ---------------------------------------------------------------------------*/
DWORD InetInitCredentialPersist()
{
    HRESULT hr;
    IPStore *pIPStore = NULL;
    DWORD dwDisable, dwAvail, dwLSADisable;
    HINSTANCE hInstPStoreC = 0;
    BOOL fPersistDisabled = FALSE;

    AuthLock();
    
    // First check to see if persistence is disabled via registry.
    if ((InternetReadRegistryDword(DISABLE_PASSWORD_CACHE_VALUE, &dwDisable) == ERROR_SUCCESS)
        && (dwDisable == CRED_PERSIST_AVAIL))
    {
        // Persistence disabled via registry.
        dwAvail= CRED_PERSIST_NOT_AVAIL;
        goto quit;
    }

    // check to see if credmgr registry has disabled it
    if ( ReadLSARegistryDword( "DisableDomainCreds", & dwLSADisable ) && dwLSADisable )
    {
        // Persistence disabled via registry.
        dwAvail= CRED_PERSIST_NOT_AVAIL;
        goto quit;
    }
    
    // We use PWL for Win95; this should be available.
    if (IsPlatformWin95())
    {
        dwAvail = CRED_PERSIST_AVAIL;
        goto quit;
    }

    // If is WinNt, check if PStore is installed. 
    hInstPStoreC = LoadLibrary(PSTORE_MODULE);
    if (!hInstPStoreC)
    {
        dwAvail = CRED_PERSIST_NOT_AVAIL;
        goto quit;
    }
    else
    {
        // Get CreatePStoreInstance function pointer.
        pPStoreCreateInstance = (PFNPSTORECREATEINSTANCE) 
            GetProcAddress(hInstPStoreC, "PStoreCreateInstance");
        
        if (!pPStoreCreateInstance)
        {
            dwAvail = CRED_PERSIST_NOT_AVAIL;
            goto quit;
        }
    }
    
    // Create an IPStore.
    hr = CreatePStore(&pIPStore);
        
    // Succeeded in creating an IPStore.
    if (SUCCEEDED(hr) && pIPStore)
    {
        ReleasePStore(pIPStore);
        dwAvail = CRED_PERSIST_AVAIL;
    }
    else
    {
        // Failed to create an IPStore.
        dwAvail = CRED_PERSIST_NOT_AVAIL;
    }

quit:
    g_dwCredPersistAvail = dwAvail;

    AuthUnlock();

    return g_dwCredPersistAvail;
}


/*-----------------------------------------------------------------------------
  InetSetCachedCredentials
  ---------------------------------------------------------------------------*/
DWORD InetSetCachedCredentials  (LPSTR szHost, 
                                 LPSTR szRealm, 
                                 LPSTR szUser, 
                                 LPSTR szPass)
{
    DWORD cbKey, cbCred, dwError = ERROR_INTERNET_INTERNAL_ERROR;

    CHAR szKey [MAX_AUTH_FIELD_LENGTH], 
         szCred[MAX_AUTH_FIELD_LENGTH];

    INET_ASSERT(szHost && *szHost && szRealm 
        && szUser && *szUser && szPass);

    // Check if credential persistence is available.
    if ((g_dwCredPersistAvail == CRED_PERSIST_UNKNOWN)
        && (InetInitCredentialPersist() == CRED_PERSIST_NOT_AVAIL))
    {
        dwError = ERROR_INTERNET_INTERNAL_ERROR;
        goto quit;
    }


    // Form key and credential strings.
    cbKey  = wsprintf(szKey, "%s/%s", szHost, szRealm) + 1;
#ifndef UNIX
    cbCred = wsprintf(szCred,"%s:%s", szUser, szPass) + 1;
#else
    /* wsprintf on UNIX puts "(null)" if szPass is null. */
    cbCred = szPass ? (wsprintf(szCred,"%s:%s", szUser, szPass) + 1) :
                      (wsprintf(szCred,"%s:", szUser) + 1);
#endif /* UNIX */
        
    // Store credentials.
    if (IsPlatformWin95())
    {
        // Store credentials using PWL.
        dwError = PWLSetCachedCredentials(szKey, cbKey, szCred, cbCred);
    }
    else
    {
        // Store credentials using PStore.
        dwError = PStoreSetCachedCredentials(szKey, cbKey, szCred, cbCred);
    }

quit:

    return dwError;
}


/*-----------------------------------------------------------------------------
  InetGetCachedCredentials
  ---------------------------------------------------------------------------*/
DWORD InetGetCachedCredentials  (LPSTR szHost, 
                                 LPSTR szRealm, 
                                 LPSTR szUser, 
                                 LPSTR szPass)

{
    DWORD cbKey, cbCred, nUser, dwError;

    CHAR szKey [MAX_AUTH_FIELD_LENGTH],
         szCred[MAX_AUTH_FIELD_LENGTH],
         *ptr;

    INET_ASSERT(szHost && *szHost && szRealm && szUser && szPass);

    // Check if credential persistence is available.
    if (g_dwCredPersistAvail == CRED_PERSIST_UNKNOWN)
        InetInitCredentialPersist();
    
    if (g_dwCredPersistAvail == CRED_PERSIST_NOT_AVAIL)
    {
        dwError = ERROR_INTERNET_INTERNAL_ERROR;
        goto quit;
    }


    // Key string in form of host/[realm or domain].
    cbKey  = wsprintf(szKey, "%s/%s", szHost, szRealm) + 1;
    cbCred = MAX_AUTH_FIELD_LENGTH;

    if (IsPlatformWin95())
    {
        // Store credentials using PWL.
        if ((dwError = PWLGetCachedCredentials(szKey, cbKey, 
            szCred, &cbCred)) != WN_SUCCESS)
            goto quit;
    }
    else
    {
        // Store credentials using PStore.
        if ((dwError = PStoreGetCachedCredentials(szKey, cbKey, 
            szCred, &cbCred)) != ERROR_SUCCESS)
            goto quit;
    }

    // Should have retrieved credentials in form of username:password.
    ptr = strchr(szCred, ':');

    // Should never happen since username & password are required.
    if (!ptr || (ptr == szCred))
    {
        dwError = ERROR_INTERNET_INTERNAL_ERROR;
        goto quit;
    }

    // Copy username & null terminate.
    nUser = (DWORD)(ptr - szCred);
    memcpy(szUser, szCred, nUser);
    szUser[nUser] = '\0';

    // Copy password with null terminator.
    memcpy(szPass, ptr+1, cbCred - nUser);

quit:
    
    return dwError;
}


/*-----------------------------------------------------------------------------
  InetRemoveCachedCredentials
  ---------------------------------------------------------------------------*/
DWORD InetRemoveCachedCredentials (LPSTR szHost, LPSTR szRealm)
{
    DWORD cbKey, dwError;
    CHAR szKey[MAX_AUTH_FIELD_LENGTH];

    INET_ASSERT(szHost && *szHost && szRealm);

    // Check if credential persistence is available.
    if ((g_dwCredPersistAvail == CRED_PERSIST_UNKNOWN)
        && (InetInitCredentialPersist() == CRED_PERSIST_NOT_AVAIL))
    {
        dwError = ERROR_INTERNET_INTERNAL_ERROR;
        goto quit;
    }

    // Form key string.
    cbKey  = wsprintf(szKey, "%s/%s", szHost, szRealm) + 1;

    if (IsPlatformWin95())
    {
        // Remove credentials from PWL.
        dwError = PWLRemoveCachedCredentials(szKey, cbKey);
    }
    else
    {
        // Remove credentials from PStore.
        dwError =  PStoreRemoveCachedCredentials(szKey, cbKey);
    }

quit:
    return dwError;
}


/*--------------------------- PWL Functions ---------------------------------*/



/*-----------------------------------------------------------------------------
  PWLSetCachedCredentials
  ---------------------------------------------------------------------------*/
DWORD PWLSetCachedCredentials(LPSTR szKey, DWORD cbKey, 
                              LPSTR szCred, DWORD cbCred)
{
    DWORD dwError;

    // Load WNet.
    if (!LoadWNet())
        return ERROR_INTERNET_INTERNAL_ERROR;
    
    // Store credentials.  
    dwError =  (*pfWNetCachePassword)(szKey, (WORD) cbKey, szCred, (WORD) cbCred, PCE_WWW_BASIC, 0); 

    return dwError;
}




/*-----------------------------------------------------------------------------
  PWLGetCachedCredentials
  ---------------------------------------------------------------------------*/
DWORD PWLGetCachedCredentials  (LPSTR szKey, DWORD cbKey, 
                                LPSTR szCred, LPDWORD pcbCred)
{    
    DWORD dwError;

    // Load WNet.
    if (!LoadWNet())
        return ERROR_INTERNET_INTERNAL_ERROR;

    // Retrieve credentials.
    dwError = (*pfWNetGetCachedPassword) (szKey, (WORD) cbKey, szCred, 
                                          (LPWORD) pcbCred, PCE_WWW_BASIC);
    
    return dwError;
}



/*-----------------------------------------------------------------------------
  PWLRemoveCachedCredentials
  ---------------------------------------------------------------------------*/
DWORD PWLRemoveCachedCredentials  (LPSTR szKey, DWORD cbKey)
{
    DWORD dwError;

    // Load WNet.
    if (!LoadWNet())
        return ERROR_INTERNET_INTERNAL_ERROR;

    dwError = (*pfWNetRemoveCachedPassword) (szKey, (WORD) cbKey, PCE_WWW_BASIC);

    return dwError;
}


// PWL utility functions.


/*-----------------------------------------------------------------------------
  LoadWNet
  ---------------------------------------------------------------------------*/
BOOL LoadWNet(VOID)
{
    BOOL fReturn;
    
    AuthLock();

    // 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;
    }

    pfWNetGetCachedPassword    = (PFWNETGETCACHEDPASSWORD)    GetProcAddress(MhmodWNET, WNETGETCACHEDPASS);
    pfWNetCachePassword        = (PFWNETCACHEPASSWORD)        GetProcAddress(MhmodWNET, WNETCACHEPASS);
    pfWNetRemoveCachedPassword = (PFWNETREMOVECACHEDPASSWORD) GetProcAddress(MhmodWNET, WNETREMOVECACHEDPASS);

    // Ensure we have all function pointers.
    if (!(pfWNetGetCachedPassword 
          && pfWNetCachePassword
          && pfWNetRemoveCachedPassword))
    {
        fReturn = FALSE;
    }

quit:
    AuthUnlock();
    
    return fReturn;
}



/*------------------------- PStore Functions -------------------------------*/



/*-----------------------------------------------------------------------------
  PStoreSetCachedCredentials
  ---------------------------------------------------------------------------*/
DWORD PStoreSetCachedCredentials(LPSTR szKey, DWORD cbKey, 
                                 LPSTR szCred, DWORD cbCred, 
                                 BOOL fRemove)
{
    INET_ASSERT(pPStoreCreateInstance);

    HRESULT         hr;
    DWORD           dwError;
    
    PST_TYPEINFO    typeInfo;
    PST_PROMPTINFO  promptInfo = {0};

    GUID itemType    = GUID_PStoreType;
    GUID itemSubtype = GUID_NULL;

    WCHAR wszKey[MAX_AUTH_FIELD_LENGTH];
    
    IPStore *       pStore = NULL;
    
    // PST_TYPEINFO data.
    typeInfo.cbSize = sizeof(typeInfo);
    typeInfo.szDisplayName = c_szWininetCacheCredentials;

    // 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;

    INET_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;
            
    // Convert key to wide char.
    MultiByteToWideChar(CP_ACP, 0, szKey, -1, wszKey, MAX_AUTH_FIELD_LENGTH);
    
    // Valid credentials are written; No credentials imples
    // that the key and credentials are to be deleted.
    if (szCred && cbCred && !fRemove)
    {
        // Write key and credentials to PStore.
        hr = pStore->WriteItem(PST_KEY_CURRENT_USER,
                               &itemType,
                               &itemSubtype,
                               wszKey,
                               cbCred,
                               (LPBYTE) szCred,
                               &promptInfo,
                               PST_CF_NONE,
                               0);
    }
    else
    {
        // Delete key and credentials from PStore.
        hr = pStore->DeleteItem(PST_KEY_CURRENT_USER,
                                &itemType,
                                &itemSubtype,
                                wszKey,
                                &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(LPSTR szKey, DWORD cbKey, 
                                 LPSTR szCred, LPDWORD pcbCred)
{
    INET_ASSERT(pPStoreCreateInstance);

    HRESULT          hr ;
    DWORD            dwError;
    LPBYTE           pbData;

    PST_PROMPTINFO   promptInfo  = {0};

    GUID             itemType    = GUID_PStoreType;
    GUID             itemSubtype = GUID_NULL;

    IPStore*         pStore      = NULL;
    
    WCHAR wszKey[MAX_AUTH_FIELD_LENGTH];

    
    // 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;

    INET_ASSERT(pStore != NULL);

    // Convert key to wide char.
    MultiByteToWideChar(CP_ACP, 0, szKey, -1, wszKey, MAX_AUTH_FIELD_LENGTH);

    // Read the credentials from PStore.
    hr = pStore->ReadItem(PST_KEY_CURRENT_USER,
                          &itemType,
                          &itemSubtype,
                          wszKey,
                          pcbCred,
                          (LPBYTE*) &pbData,
                          &promptInfo,
                          0);

    // Copy credentials and free buffer allocated by ReadItem.
    if (SUCCEEDED(hr))
    {
        memcpy(szCred, 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(LPSTR szKey, DWORD cbKey)
{
    // Pass in TRUE to remove credentials.
    return PStoreSetCachedCredentials(szKey, cbKey, NULL, 0, TRUE);
}

// PStore utility functions

/*-----------------------------------------------------------------------------
  CreatePStore
  ---------------------------------------------------------------------------*/
STDAPI CreatePStore(IPStore **ppIPStore)
{
    HRESULT hr;
    DWORD dwError;

    
    hr = pPStoreCreateInstance (ppIPStore,
                                  IsEqualGUID(s_provID, GUID_NULL) ? NULL : &s_provID,
                                  NULL,
                                  0);

  if (SUCCEEDED(hr))
        dwError = ERROR_SUCCESS;
    else
        dwError = ERROR_INTERNET_INTERNAL_ERROR;

    return dwError;
}


/*-----------------------------------------------------------------------------
  ReleasePStore
  ---------------------------------------------------------------------------*/
STDAPI ReleasePStore(IPStore *pIPStore)
{
    HRESULT hr;

    if (pIPStore)
    {
        pIPStore->Release();
        hr = S_OK;
    }
    else
    {
        hr = E_POINTER;
    }

    return hr;
}