我需要通过编程创建一个目录,并将"完全控制"权限授予"所有人"组。如果我使用
CreateDirectory(path, NULL);
根据Win32 SDK 文档,这将创建一个继承自其父目录的目录。我不想继承父目录的访问权限,需要确保“所有人”对该目录拥有完全控制权。
显然,这需要使用适当的安全描述符设置
SECURITY_ATTRIBUTES
结构。我该怎么做?这里有一种看起来可行的技巧:
SID_IDENTIFIER_AUTHORITY SIDAuthWorld = SECURITY_WORLD_SID_AUTHORITY;
PSID everyone_sid = NULL;
AllocateAndInitializeSid(&SIDAuthWorld, 1, SECURITY_WORLD_RID,
0, 0, 0, 0, 0, 0, 0, &everyone_sid);
EXPLICIT_ACCESS ea;
ZeroMemory(&ea, sizeof(EXPLICIT_ACCESS));
ea.grfAccessPermissions = SPECIFIC_RIGHTS_ALL | STANDARD_RIGHTS_ALL;
ea.grfAccessMode = SET_ACCESS;
ea.grfInheritance = NO_INHERITANCE;
ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea.Trustee.TrusteeType = TRUSTEE_IS_WELL_KNOWN_GROUP;
ea.Trustee.ptstrName = (LPWSTR)everyone_sid;
PACL acl = NULL;
SetEntriesInAcl(1, &ea, NULL, &acl);
PSECURITY_DESCRIPTOR sd = (PSECURITY_DESCRIPTOR)LocalAlloc(LPTR,
SECURITY_DESCRIPTOR_MIN_LENGTH);
InitializeSecurityDescriptor(sd, SECURITY_DESCRIPTOR_REVISION);
SetSecurityDescriptorDacl(sd, TRUE, acl, FALSE);
SECURITY_ATTRIBUTES sa;
sa.nLength = sizeof(SECURITY_ATTRIBUTES);
sa.lpSecurityDescriptor = sd;
sa.bInheritHandle = FALSE;
CreateDirectory(path, &sa);
FreeSid(everyone_sid);
LocalFree(sd);
LocalFree(acl);
请注意,此示例代码完全没有错误检查 — 您需要自己提供。
我更喜欢以下代码片段,因为它创建了一个继承默认权限的文件夹 - 这似乎是正确的做法 - 其他软件/用户可能已经为目录设置了特定的可继承权限,出于合法的原因 - 然后添加了一个内置“用户”组的完全控制显式访问条目。
BOOL CreateDirectoryWithUserFullControlACL(LPCTSTR lpPath)
{
if(!CreateDirectory(lpPath,NULL))
return FALSE;
HANDLE hDir = CreateFile(lpPath,READ_CONTROL|WRITE_DAC,0,NULL,OPEN_EXISTING,FILE_FLAG_BACKUP_SEMANTICS,NULL);
if(hDir == INVALID_HANDLE_VALUE)
return FALSE;
ACL* pOldDACL;
SECURITY_DESCRIPTOR* pSD = NULL;
GetSecurityInfo(hDir, SE_FILE_OBJECT , DACL_SECURITY_INFORMATION,NULL, NULL, &pOldDACL, NULL, (void**)&pSD);
PSID pSid = NULL;
SID_IDENTIFIER_AUTHORITY authNt = SECURITY_NT_AUTHORITY;
AllocateAndInitializeSid(&authNt,2,SECURITY_BUILTIN_DOMAIN_RID,DOMAIN_ALIAS_RID_USERS,0,0,0,0,0,0,&pSid);
EXPLICIT_ACCESS ea={0};
ea.grfAccessMode = GRANT_ACCESS;
ea.grfAccessPermissions = GENERIC_ALL;
ea.grfInheritance = CONTAINER_INHERIT_ACE|OBJECT_INHERIT_ACE;
ea.Trustee.TrusteeType = TRUSTEE_IS_GROUP;
ea.Trustee.TrusteeForm = TRUSTEE_IS_SID;
ea.Trustee.ptstrName = (LPTSTR)pSid;
ACL* pNewDACL = 0;
DWORD err = SetEntriesInAcl(1,&ea,pOldDACL,&pNewDACL);
if(pNewDACL)
SetSecurityInfo(hDir,SE_FILE_OBJECT,DACL_SECURITY_INFORMATION,NULL, NULL, pNewDACL, NULL);
FreeSid(pSid);
LocalFree(pNewDACL);
LocalFree(pSD);
LocalFree(pOldDACL);
CloseHandle(hDir);
return TRUE;
}
请尝试使用SetSecurityInfo()。
在可选参数pDacl的描述中:
…如果SecurityInfo参数的值包括DACL-SECURITY-INFORMATION标志,并且此参数的值设置为NULL,则授予每个人对对象的完全访问权限。