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