48 lines
1.4 KiB
Go
48 lines
1.4 KiB
Go
// Copyright 2014 beego Author. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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//go:build windows
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// +build windows
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package utils
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import (
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"os"
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"syscall"
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)
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// OpenFileSecure Secure file opening function
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// Check whether it is a symbolic connection in Windows
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// NOTE: This check does not prevent TOCTOU vulnerability on Windows,
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// due to lack of O_NOFOLLOW or equivalent low-level open options in Go stdlib.
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func OpenFileSecure(name string, flag int, perm os.FileMode) (*os.File, error) {
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// Check if it's a symbolic link
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if fi, err := os.Lstat(name); err == nil {
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if isSymlink(fi) {
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return nil, &os.PathError{
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Op: "open",
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Path: name,
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Err: syscall.ERROR_ACCESS_DENIED,
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}
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}
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}
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// Open the file in the normal way
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return os.OpenFile(name, flag, perm)
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}
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// isSymlink Check if the file is a symbolic link
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func isSymlink(fi os.FileInfo) bool {
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return fi.Mode()&os.ModeSymlink != 0
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}
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