我需要测试用户是否可以在实际尝试这样做之前写入文件夹。
我已经实现了以下方法(在c# 2.0中)，它尝试使用Directory.GetAccessControl()方法检索文件夹的安全权限。
private bool hasWriteAccessToFolder(string folderPath)
{
try
{
// Attempt to get a list of security permissions from the folder.
// This will raise an exception if the path is read only or do not have access to view the permissions.
System.Security.AccessControl.DirectorySecurity ds = Directory.GetAccessControl(folderPath);
return true;
}
catch (UnauthorizedAccessException)
{
return false;
}
}
当我在谷歌上搜索如何测试写访问权限时，没有这样的结果，而且在Windows中测试权限看起来非常复杂。我担心我过于简化了事情，这个方法并不健壮，尽管它似乎确实有效。
我测试当前用户是否具有写访问权限的方法是否正确?
这应该是您所需要的全部内容，据我所知，您只需要捕获一个异常。
private static readonly byte[] TestArray = new byte[]{
69, 70, 71, 72
};
private static bool IsFolderAccessible(string path) {
var temp_path = Path.Combine(path, Path.GetRandomFileName());
try {
using (var file = File.Create(temp_path, TestArray.Length, FileOptions.DeleteOnClose)) {
file.Write(TestArray, 0, TestArray.Length);
}
return true;
} catch (UnauthorizedAccessException ex) {
Log.Warn($"Error accessing file {temp_path}", ex);
return false;
}
}
Here is a modified version of CsabaS's answer, which accounts for explicit deny access rules. The function goes through all FileSystemAccessRules for a directory, and checks if the current user is in a role which has access to a directory. If no such roles are found or the user is in a role with denied access, the function returns false. To check read rights, pass FileSystemRights.Read to the function; for write rights, pass FileSystemRights.Write. If you want to check an arbitrary user's rights and not the current one's, substitute the currentUser WindowsIdentity for the desired WindowsIdentity. I would also advise against relying on functions like this to determine if the user can safely use the directory. This answer perfectly explains why.
public static bool UserHasDirectoryAccessRights(string path, FileSystemRights accessRights)
{
var isInRoleWithAccess = false;
try
{
var di = new DirectoryInfo(path);
var acl = di.GetAccessControl();
var rules = acl.GetAccessRules(true, true, typeof(NTAccount));
var currentUser = WindowsIdentity.GetCurrent();
var principal = new WindowsPrincipal(currentUser);
foreach (AuthorizationRule rule in rules)
{
var fsAccessRule = rule as FileSystemAccessRule;
if (fsAccessRule == null)
continue;
if ((fsAccessRule.FileSystemRights & accessRights) > 0)
{
var ntAccount = rule.IdentityReference as NTAccount;
if (ntAccount == null)
continue;
if (principal.IsInRole(ntAccount.Value))
{
if (fsAccessRule.AccessControlType == AccessControlType.Deny)
return false;
isInRoleWithAccess = true;
}
}
}
}
catch (UnauthorizedAccessException)
{
return false;
}
return isInRoleWithAccess;
}
这里的大多数答案都不检查写访问。它只是检查用户/组是否可以“读取权限”(读取文件/目录的ACE列表)。
此外，遍历ACE并检查它是否与安全标识符匹配也不起作用，因为用户可能是他可能获得/失去特权的组的成员。更糟糕的是嵌套组。
我知道这是一个旧的线程，但有一个更好的方式为任何人现在看。
如果用户具有Read Permission权限为，则可以使用Authz API检查有效访问。
https://learn.microsoft.com/en-us/windows/win32/secauthz/using-authz-api
https://learn.microsoft.com/en-us/windows/win32/secauthz/checking-access-with-authz-api
