129 lines
3.7 KiB
Go
129 lines
3.7 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019-2021 WireGuard LLC. All Rights Reserved.
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*/
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package conf
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import (
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"errors"
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"os"
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"path/filepath"
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"strings"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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var cachedConfigFileDir string
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var cachedRootDir string
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func tunnelConfigurationsDirectory() (string, error) {
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if cachedConfigFileDir != "" {
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return cachedConfigFileDir, nil
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}
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root, err := RootDirectory(true)
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if err != nil {
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return "", err
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}
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c := filepath.Join(root, "Configurations")
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err = os.Mkdir(c, os.ModeDir|0700)
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if err != nil && !os.IsExist(err) {
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return "", err
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}
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cachedConfigFileDir = c
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return cachedConfigFileDir, nil
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}
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// PresetRootDirectory causes RootDirectory() to not try any automatic deduction, and instead
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// uses what's passed to it. This isn't used by wireguard-windows, but is useful for external
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// consumers of our libraries who might want to do strange things.
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func PresetRootDirectory(root string) {
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cachedRootDir = root
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}
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func RootDirectory(create bool) (string, error) {
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if cachedRootDir != "" {
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return cachedRootDir, nil
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}
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root, err := windows.KnownFolderPath(windows.FOLDERID_ProgramFiles, windows.KF_FLAG_DEFAULT)
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if err != nil {
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return "", err
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}
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root = filepath.Join(root, "WireGuard")
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if !create {
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return filepath.Join(root, "Data"), nil
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}
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root16, err := windows.UTF16PtrFromString(root)
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if err != nil {
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return "", err
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}
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// The root directory inherits its ACL from Program Files; we don't want to mess with that
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err = windows.CreateDirectory(root16, nil)
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if err != nil && err != windows.ERROR_ALREADY_EXISTS {
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return "", err
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}
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dataDirectorySd, err := windows.SecurityDescriptorFromString("O:SYG:SYD:PAI(A;OICI;FA;;;SY)(A;OICI;FA;;;BA)")
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if err != nil {
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return "", err
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}
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dataDirectorySa := &windows.SecurityAttributes{
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Length: uint32(unsafe.Sizeof(windows.SecurityAttributes{})),
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SecurityDescriptor: dataDirectorySd,
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}
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data := filepath.Join(root, "Data")
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data16, err := windows.UTF16PtrFromString(data)
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if err != nil {
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return "", err
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}
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var dataHandle windows.Handle
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for {
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err = windows.CreateDirectory(data16, dataDirectorySa)
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if err != nil && err != windows.ERROR_ALREADY_EXISTS {
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return "", err
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}
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dataHandle, err = windows.CreateFile(data16, windows.READ_CONTROL|windows.WRITE_OWNER|windows.WRITE_DAC, windows.FILE_SHARE_READ|windows.FILE_SHARE_WRITE|windows.FILE_SHARE_DELETE, nil, windows.OPEN_EXISTING, windows.FILE_FLAG_BACKUP_SEMANTICS|windows.FILE_FLAG_OPEN_REPARSE_POINT|windows.FILE_ATTRIBUTE_DIRECTORY, 0)
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if err != nil && err != windows.ERROR_FILE_NOT_FOUND {
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return "", err
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}
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if err == nil {
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break
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}
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}
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defer windows.CloseHandle(dataHandle)
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var fileInfo windows.ByHandleFileInformation
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err = windows.GetFileInformationByHandle(dataHandle, &fileInfo)
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if err != nil {
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return "", err
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}
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if fileInfo.FileAttributes&windows.FILE_ATTRIBUTE_DIRECTORY == 0 {
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return "", errors.New("Data directory is actually a file")
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}
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if fileInfo.FileAttributes&windows.FILE_ATTRIBUTE_REPARSE_POINT != 0 {
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return "", errors.New("Data directory is reparse point")
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}
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buf := make([]uint16, windows.MAX_PATH+4)
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for {
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bufLen, err := windows.GetFinalPathNameByHandle(dataHandle, &buf[0], uint32(len(buf)), 0)
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if err != nil {
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return "", err
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}
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if bufLen < uint32(len(buf)) {
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break
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}
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buf = make([]uint16, bufLen)
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}
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if !strings.EqualFold(`\\?\`+data, windows.UTF16ToString(buf[:])) {
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return "", errors.New("Data directory jumped to unexpected location")
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}
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err = windows.SetKernelObjectSecurity(dataHandle, windows.DACL_SECURITY_INFORMATION|windows.GROUP_SECURITY_INFORMATION|windows.OWNER_SECURITY_INFORMATION|windows.PROTECTED_DACL_SECURITY_INFORMATION, dataDirectorySd)
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if err != nil {
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return "", err
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}
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cachedRootDir = data
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return cachedRootDir, nil
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}
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