在哪里放置常见的可写应用程序文件？

Question

我认为这CSIDL_COMMON_APPDATA\company\product应该是放置应用程序的所有用户和应用程序可以修改的文件的地方,但是,在Vista上这是一个只读位置,除非安装程序修改(根据MSDN - http: //msdn.microsoft.com/en-us/library/ms995853.aspx),那么......什么是最好的？修改位置的安全设置以允许编写或使用CSIDL_COMMON_DOCUMENTS\company\product？也许还有第三种选择？

此外,微软是否有某个"官方"推荐？

Answer 1

仅修改AppData目录的特定子目录上的安全性(这来自您提供的链接):

CSIDL_COMMON_APPDATA此文件夹应该用于非用户特定的应用程序数据.例如,应用程序可以在CSIDL_COMMON_APPDATA文件夹中存储拼写检查字典,剪贴画数据库或日志文件.此信息不会漫游,并且可供使用该计算机的任何人使用.默认情况下,此位置对于普通(非管理员,非电源)用户是只读的.如果应用程序要求普通用户具有对CSIDL_COMMON_APPDATA的特定于应用程序的子目录的写访问权限,则应用程序必须在应用程序设置期间显式修改该子目录的安全性.修改后的安全性必须记录在供应商调查问卷中.

Answer 2

下面是一个简单示例,说明如何为Common App Data文件夹(CSIDL_COMMON_APPDATA)中的所有用户创建具有读/写权限的文件和文件夹.任何用户都可以运行此代码,以授予所有其他用户写入文件和文件夹的权限:

#include <windows.h>

#include <shlobj.h>
#pragma comment(lib, "shell32.lib")

// for PathAppend
#include <Shlwapi.h>
#pragma comment(lib, "Shlwapi.lib")

#include <stdio.h>
#include <aclapi.h>
#include <tchar.h>
#pragma comment(lib, "advapi32.lib")    

#include <iostream>
#include <fstream>
using namespace std;

int _tmain(int argc, _TCHAR* argv[])
{
    DWORD dwRes, dwDisposition;
    PSID pEveryoneSID = NULL;
    PACL pACL = NULL;
    PSECURITY_DESCRIPTOR pSD = NULL;
    EXPLICIT_ACCESS ea;
    SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
    SID_IDENTIFIER_AUTHORITY SIDAuthNT = SECURITY_NT_AUTHORITY;
    SECURITY_ATTRIBUTES sa;

    // Create a well-known SID for the Everyone group.
    if (!AllocateAndInitializeSid(&SIDAuthWorld, 1,
                     SECURITY_WORLD_RID, 0, 0, 0, 0, 0, 0, 0,
                     &pEveryoneSID))
    {
        _tprintf(_T("AllocateAndInitializeSid Error %u\n"), GetLastError());
        goto Cleanup;
    }

    // Initialize an EXPLICIT_ACCESS structure for an ACE.
    // The ACE will allow Everyone access to files & folders you create.
    ZeroMemory(&ea, sizeof(EXPLICIT_ACCESS));
    ea.grfAccessPermissions = 0xFFFFFFFF;
    ea.grfAccessMode = SET_ACCESS;

    // both folders & files will inherit this ACE
    ea.grfInheritance= CONTAINER_INHERIT_ACE|OBJECT_INHERIT_ACE;
    ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
    ea.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
    ea.Trustee.ptstrName  = (LPTSTR) pEveryoneSID;

    // Create a new ACL that contains the new ACEs.
    dwRes = SetEntriesInAcl(1, &ea, NULL, &pACL);
    if (ERROR_SUCCESS != dwRes)
    {
        _tprintf(_T("SetEntriesInAcl Error %u\n"), GetLastError());
        goto Cleanup;
    }

    // Initialize a security descriptor.
    pSD = (PSECURITY_DESCRIPTOR) LocalAlloc(LPTR, SECURITY_DESCRIPTOR_MIN_LENGTH);
    if (NULL == pSD)
    {
        _tprintf(_T("LocalAlloc Error %u\n"), GetLastError());
        goto Cleanup;
    }

    if (!InitializeSecurityDescriptor(pSD, SECURITY_DESCRIPTOR_REVISION))
    {
        _tprintf(_T("InitializeSecurityDescriptor Error %u\n"), GetLastError());
        goto Cleanup;
    }

    // Add the ACL to the security descriptor.
    if (!SetSecurityDescriptorDacl(pSD,
            TRUE,     // bDaclPresent flag
            pACL,
            FALSE))   // not a default DACL
    {
        _tprintf(_T("SetSecurityDescriptorDacl Error %u\n"), GetLastError());
        goto Cleanup;
    }

    // Initialize a security attributes structure.
    sa.nLength = sizeof(SECURITY_ATTRIBUTES);
    sa.lpSecurityDescriptor = pSD;
    sa.bInheritHandle = FALSE;



    TCHAR szPath[MAX_PATH];

    if (SUCCEEDED(SHGetFolderPath(NULL, CSIDL_COMMON_APPDATA|CSIDL_FLAG_CREATE, NULL, 0, szPath))) 
    {
        PathAppend(szPath, TEXT("Your Shared Folder"));

        if (!CreateDirectory(szPath, &sa)
            && GetLastError() != ERROR_ALREADY_EXISTS) 
        {
            goto Cleanup;
        }

        PathAppend(szPath, TEXT("textitup.txt"));

        HANDLE hFile = CreateFile(szPath, GENERIC_READ | GENERIC_WRITE, 0, &sa, CREATE_ALWAYS, 0, 0);
        if (hFile == INVALID_HANDLE_VALUE)
            goto Cleanup;
        else
            CloseHandle(hFile);

        //TODO: do the writing
        ofstream fsOut;
        fsOut.exceptions(ios::eofbit | ios::failbit | ios::badbit);
        fsOut.open(szPath, ios::out | ios::binary | ios::trunc);

        fsOut << "Hello world!\n";
        fsOut.close();
    }

Cleanup:

    if (pEveryoneSID) 
        FreeSid(pEveryoneSID);
    if (pACL) 
        LocalFree(pACL);
    if (pSD) 
        LocalFree(pSD);

    return 0;
}

Answer 3

我认为这篇文章可能会回答一些问题，但对许多人来说这似乎是一个难题。

显然，CSIDL_COMMON_DOCUMENTS 提供了一种通用的解决方法