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408 lines
15 KiB
408 lines
15 KiB
//***********************************************************************************
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//
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// Copyright (c) 2002 Microsoft Corporation. All Rights Reserved.
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//
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// File: EnsureACLs.cpp
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// Module: util.lib
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//
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//***********************************************************************************
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#pragma once
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#ifndef _WIN32_WINNT
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#define _WIN32_WINNT 0x0500 // Win2000 and later
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#endif
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#include <windows.h>
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#include <tchar.h>
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#include <safefunc.h>
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#include <shlobj.h>
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#include <sddl.h>
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#include <Aclapi.h>
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#include <fileutil.h>
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#include <logging.h>
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#include <wusafefn.h>
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#include <mistsafe.h>
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#if defined(UNICODE) || defined (_UNICODE)
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typedef DWORD (*TREERESETSECURITY)(
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LPTSTR pObjectName,
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SE_OBJECT_TYPE ObjectType,
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SECURITY_INFORMATION SecurityInfo,
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PSID pOwner OPTIONAL,
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PSID pGroup OPTIONAL,
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PACL pDacl OPTIONAL,
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PACL pSacl OPTIONAL,
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BOOL KeepExplicit,
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FN_PROGRESS fnProgress OPTIONAL,
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PROG_INVOKE_SETTING ProgressInvokeSetting,
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PVOID Args OPTIONAL);
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//Function to enable or disable a particular privelege for the current process
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//Last parameter is optional, will return the previous state of the privelege
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DWORD EnablePrivilege(LPCTSTR pszPrivName, BOOL fEnable, BOOL *pfWasEnabled);
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/******************************************************************************
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//Function to recursively set ACLS on the specified folder.
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//Currently we set the following ACL's
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// * Allow SYSTEM full control
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// * Allow Admins full control
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// * Allow Owners full control
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// * Allow Power Users R/W/X control
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******************************************************************************/
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HRESULT SetDirPermissions(LPCTSTR lpszDir);
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#endif
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//Rename the 'WindowsUpdate' file to 'WindowsUpdate.TickCount'; if rename fails we try to delete it
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//Note that we wont revert the ownerhip of the file
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BOOL RenameWUFile(LPCTSTR lpszFilePath);
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/*****************************************************************************
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//Function to set ACL's on Windows Update directories, optionally creates the
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//directory if it doesnt already exists
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//This function will:
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// * Take ownership of the directory and it's children
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// * Set all the children to inherit ACL's from parent
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// * Set the specified directory to NOT inherit properties from it's parent
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// * Set the required ACL's on the specified directory
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// * Replace the ACL's on the children (i.e. propogate own ACL's and remove
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// those ACL's which were explicitly set
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//
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// Input:
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// lpszDirectory: Path to the directory to ACL, If it is NULL we use the
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path to the WindowsUpdate directory
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fCreateAlways: Flag to indicate creation of new directory if it doesnt
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already exist
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******************************************************************************/
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HRESULT CreateDirectoryAndSetACLs(LPCTSTR lpszDirectory, BOOL fCreateAlways)
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{
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LOG_Block("CreateDirectoryAndSetACLs");
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BOOL fIsDirectory = FALSE;
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LPTSTR lpszWUDirPath = NULL;
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LPTSTR lpszDirPath = NULL;
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#if defined(UNICODE) || defined (_UNICODE)
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BOOL fChangedPriv = FALSE;
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BOOL fPrevPrivEnabled = FALSE;
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#endif
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HRESULT hr = HRESULT_FROM_WIN32(ERROR_CANNOT_MAKE);
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if(NULL == lpszDirectory && !fCreateAlways)
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{
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hr = E_INVALIDARG;
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goto done;
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}
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//Use WU directory if input parameter is NULL
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if(NULL == lpszDirectory)
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{
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lpszWUDirPath = (LPTSTR)malloc(sizeof(TCHAR)*(MAX_PATH+1));
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if(NULL == lpszWUDirPath)
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{
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hr = E_OUTOFMEMORY;
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goto done;
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}
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//Get the path to the Windows Update directory
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if(!GetWUDirectory(lpszWUDirPath, MAX_PATH+1))
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{
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goto done;
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}
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lpszDirPath = lpszWUDirPath;
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}
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// else use the passed in parameter
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else
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{
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lpszDirPath = (LPTSTR)lpszDirectory;
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}
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//if dir (or file) does not exist
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if (!fFileExists(lpszDirPath, &fIsDirectory))
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{
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if(!fCreateAlways) //no need to create a new one
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{
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goto done;
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}
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if(!(fIsDirectory = CreateNestedDirectory(lpszDirPath)))
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{
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goto done;
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}
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}
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//Since these apis are only available for win2k and above, dont compile for ansii (we dont care about NT4)
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#if defined(UNICODE) || defined (_UNICODE)
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//Enable privelege to 'take ownership' , we will continue even if we failed for some reason
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fChangedPriv = (ERROR_SUCCESS == EnablePrivilege(SE_TAKE_OWNERSHIP_NAME, TRUE, &fPrevPrivEnabled));
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//Take ownership and apply correct ACL's, we dont care if we fail
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SetDirPermissions(lpszDirPath);
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#endif
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//Check for a file name-squatting on the specified directory
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if (!fIsDirectory)
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{
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if( !RenameWUFile(lpszDirPath) || //Rename or delete the existing file
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!CreateNestedDirectory(lpszDirPath)) //Create a new directory
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{
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goto done;
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}
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#if defined(UNICODE) || defined (_UNICODE)
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//Take ownership and apply correct ACL's, we dont care if we fail
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SetDirPermissions(lpszDirPath);
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#endif
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}
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hr = S_OK;
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done:
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#if defined(UNICODE) || defined (_UNICODE)
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//Restore previous privelege
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if(fChangedPriv)
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{
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EnablePrivilege(SE_TAKE_OWNERSHIP_NAME, fPrevPrivEnabled, NULL);
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}
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#endif
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SafeFreeNULL(lpszWUDirPath);
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return hr;
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}
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/********************************************************************************
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//Get the path to the WindowsUpdate Directory (without the backslash at the end)
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*********************************************************************************/
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BOOL GetWUDirectory(LPTSTR lpszDirPath, DWORD chCount, BOOL fGetV4Path)
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{
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LOG_Block("GetWUDirectory");
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const TCHAR szWUDir[] = _T("\\WindowsUpdate");
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const TCHAR szV4[] = _T("\\V4");
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BOOL fRet = FALSE;
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if(NULL == lpszDirPath)
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{
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return FALSE;
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}
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//Get the path to the Program Files directory
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if (S_OK != SHGetFolderPath(NULL, CSIDL_PROGRAM_FILES, NULL, 0, lpszDirPath))
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{
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goto done;
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}
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//Append the WU Directory
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if (FAILED(StringCchCatEx(lpszDirPath, chCount, szWUDir, NULL, NULL, MISTSAFE_STRING_FLAGS)))
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{
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goto done;
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}
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if(fGetV4Path && FAILED(StringCchCatEx(lpszDirPath, chCount, szV4, NULL, NULL, MISTSAFE_STRING_FLAGS)))
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{
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goto done;
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}
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fRet = TRUE;
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done:
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return fRet;
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}
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#if defined(UNICODE) || defined (_UNICODE)
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/********************************************************************************
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//Function to enable or disable a particular privelege
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//Last parameter is optional, will return the previous state of the privelege
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********************************************************************************/
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DWORD EnablePrivilege(LPCTSTR pszPrivName, BOOL fEnable, BOOL *pfWasEnabled)
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{
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LOG_Block("EnablePrivilege");
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DWORD dwError = ERROR_SUCCESS;
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HANDLE hToken = 0;
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DWORD dwSize = 0;
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TOKEN_PRIVILEGES privNew;
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TOKEN_PRIVILEGES privOld;
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if(!OpenProcessToken(
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GetCurrentProcess(),
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TOKEN_ADJUST_PRIVILEGES | TOKEN_QUERY,
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&hToken))
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{
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dwError = GetLastError();
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goto Cleanup;
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}
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if(!LookupPrivilegeValue(
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0,
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pszPrivName,
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&privNew.Privileges[0].Luid))
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{
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dwError = GetLastError();
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goto Cleanup;
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}
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privNew.PrivilegeCount = 1;
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privNew.Privileges[0].Attributes = fEnable ? SE_PRIVILEGE_ENABLED : 0;
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AdjustTokenPrivileges(
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hToken,
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FALSE,
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&privNew,
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sizeof(privOld),
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&privOld,
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&dwSize);
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//Always call GetLastError, even when we succeed (as per msdn)
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dwError = GetLastError();
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if(dwError != ERROR_SUCCESS)
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{
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goto Cleanup;
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}
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if (pfWasEnabled)
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{
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*pfWasEnabled = (privOld.Privileges[0].Attributes & SE_PRIVILEGE_ENABLED) ? TRUE : FALSE;
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}
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Cleanup:
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SafeCloseHandle(hToken);
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return dwError;
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}
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/********************************************************************************
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//Apply appropriate ACL's to the specified directory
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********************************************************************************/
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HRESULT SetDirPermissions(LPCTSTR lpszDir)
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{
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LOG_Block("SetDirPermissions");
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DWORD dwErr = ERROR_SUCCESS;
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PSECURITY_DESCRIPTOR pAdminSD = NULL;
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PSECURITY_DESCRIPTOR pSD = NULL;
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PACL pDacl = NULL;
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PSID pOwner = NULL;
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BOOL fIsDefault = FALSE;
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HMODULE hModule = NULL;
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TREERESETSECURITY pfnTreeResetSec = NULL;
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//Admin Security Descriptor String
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LPCTSTR pszAdminSD = _T("O:BAG:BAD:(A;OICI;FA;;;SY)(A;OICI;FA;;;BA)");
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//Security Descriptor String with correct ACLs for the WindowsUpdate Directory
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LPCTSTR pszSD = _T("D:") // DACL
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_T("(A;OICI;GA;;;SY)") // Allow SYSTEM full control
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_T("(A;OICI;GA;;;BA)") // Allow Admins full control
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_T("(A;OICI;GA;;;CO)") // Allow Owners full control
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_T("(A;OICI;GRGWGX;;;PU)"); // Allow Power Users R/W/X control
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if(NULL == lpszDir)
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{
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return E_INVALIDARG;
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}
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//Create an admin SD from admin SD string
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if(!ConvertStringSecurityDescriptorToSecurityDescriptor(pszAdminSD, SDDL_REVISION_1, &pAdminSD, NULL))
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{
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dwErr = GetLastError();
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goto done;
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}
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//Get the owner SID from the Admin SD
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if(!GetSecurityDescriptorOwner(pAdminSD, &pOwner, &fIsDefault))
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{
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dwErr = GetLastError();
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goto done;
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}
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//Generate the Security Descriptor from the SD String with custom ACL's
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if(!ConvertStringSecurityDescriptorToSecurityDescriptor(pszSD, SDDL_REVISION_1, &pSD, NULL))
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{
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dwErr = GetLastError();
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goto done;
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}
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//Exctract the DACL from the Security Descriptor
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BOOL fIsDaclPresent = FALSE;
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if(!GetSecurityDescriptorDacl(
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pSD, // SD
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&fIsDaclPresent, // DACL presence
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&pDacl, // ACL
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&fIsDefault)) // default DACL
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{
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dwErr = GetLastError();
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goto done;
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}
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//If for some reason no DACL was present, we have an invalid SD
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if(!fIsDaclPresent)
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{
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dwErr = ERROR_INVALID_SECURITY_DESCR;
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goto done;
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}
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//Load Advapi32.dll
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if ((NULL == (hModule = LoadLibraryFromSystemDir(_T("advapi32.dll")))) ||
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(NULL == (pfnTreeResetSec = (TREERESETSECURITY)::GetProcAddress(hModule, "TreeResetNamedSecurityInfo"))))
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{
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if(ERROR_SUCCESS != (dwErr = SetNamedSecurityInfo(
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(LPTSTR)lpszDir,
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SE_FILE_OBJECT,
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DACL_SECURITY_INFORMATION |
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PROTECTED_DACL_SECURITY_INFORMATION |
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OWNER_SECURITY_INFORMATION,
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pOwner,
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NULL,
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pDacl,
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NULL)))
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{
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goto done;
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}
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}
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else
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{
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//Recursively apply the ownership and the ACL's on the tree
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if(ERROR_SUCCESS != (dwErr = pfnTreeResetSec(
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(LPTSTR)lpszDir, //Directory
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SE_FILE_OBJECT, //object type
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DACL_SECURITY_INFORMATION | //Set DACL
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PROTECTED_DACL_SECURITY_INFORMATION | //Do not inherit
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OWNER_SECURITY_INFORMATION, //Set owner
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pOwner, //Owner SID
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NULL, //pGroup - null
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pDacl, //Dacl to set
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NULL, //pSacl - null
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FALSE, //Retain explicitly added ACL's to children
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NULL, //Callback function --- we dont need one
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ProgressInvokeNever, //Since we dont have a callback
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NULL))) //Other args
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{
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goto done;
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}
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}
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done:
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if ( NULL != hModule )
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{
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FreeLibrary(hModule);
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}
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SafeLocalFree(pSD);
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SafeLocalFree(pAdminSD);
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return HRESULT_FROM_WIN32(dwErr);
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}
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#endif
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/*************************************************************************************************
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//Rename the 'WindowsUpdate' file to 'WindowsUpdate.TickCount'; if rename fails we try to delete it
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//Note that we wont revert the ownerhip of the file
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**************************************************************************************************/
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BOOL RenameWUFile(LPCTSTR lpszFilePath)
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{
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LOG_Block("RenameWUFile");
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TCHAR szNewFilePath[MAX_PATH+1];
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DWORD dwTickCount = GetTickCount();
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LPTSTR szFormat = _T("%s.%lu");
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//Generate path to new file, should never fail
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if(SUCCEEDED(StringCchPrintfEx(szNewFilePath, ARRAYSIZE(szNewFilePath), NULL, NULL, MISTSAFE_STRING_FLAGS, szFormat, lpszFilePath, dwTickCount)) &&
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MoveFile(lpszFilePath, szNewFilePath) ||
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DeleteFile(lpszFilePath))
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{
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return TRUE;
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}
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return FALSE;
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}
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