99 lines
2.7 KiB
Go
99 lines
2.7 KiB
Go
/* SPDX-License-Identifier: MIT
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*
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* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
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*/
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package wintun
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import (
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"encoding/hex"
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"errors"
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"fmt"
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"sync"
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"unsafe"
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"golang.org/x/crypto/blake2s"
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"golang.org/x/sys/windows"
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"golang.org/x/text/unicode/norm"
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"golang.zx2c4.com/wireguard/tun/wintun/namespaceapi"
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)
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var (
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wintunObjectSecurityAttributes *windows.SecurityAttributes
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hasInitializedNamespace bool
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initializingNamespace sync.Mutex
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)
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func initializeNamespace() error {
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initializingNamespace.Lock()
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defer initializingNamespace.Unlock()
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if hasInitializedNamespace {
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return nil
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}
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sd, err := windows.SecurityDescriptorFromString("O:SYD:P(A;;GA;;;SY)")
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if err != nil {
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return fmt.Errorf("SddlToSecurityDescriptor failed: %v", err)
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}
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wintunObjectSecurityAttributes = &windows.SecurityAttributes{
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Length: uint32(unsafe.Sizeof(windows.SecurityAttributes{})),
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SecurityDescriptor: sd,
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}
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sid, err := windows.CreateWellKnownSid(windows.WinLocalSystemSid)
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if err != nil {
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return fmt.Errorf("CreateWellKnownSid(LOCAL_SYSTEM) failed: %v", err)
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}
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boundary, err := namespaceapi.CreateBoundaryDescriptor("Wintun")
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if err != nil {
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return fmt.Errorf("CreateBoundaryDescriptor failed: %v", err)
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}
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err = boundary.AddSid(sid)
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if err != nil {
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return fmt.Errorf("AddSIDToBoundaryDescriptor failed: %v", err)
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}
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for {
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_, err = namespaceapi.CreatePrivateNamespace(wintunObjectSecurityAttributes, boundary, "Wintun")
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if err == windows.ERROR_ALREADY_EXISTS {
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_, err = namespaceapi.OpenPrivateNamespace(boundary, "Wintun")
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if err == windows.ERROR_PATH_NOT_FOUND {
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continue
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}
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}
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if err != nil {
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return fmt.Errorf("Create/OpenPrivateNamespace failed: %v", err)
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}
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break
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}
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hasInitializedNamespace = true
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return nil
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}
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func (pool Pool) takeNameMutex() (windows.Handle, error) {
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err := initializeNamespace()
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if err != nil {
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return 0, err
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}
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const mutexLabel = "WireGuard Adapter Name Mutex Stable Suffix v1 jason@zx2c4.com"
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b2, _ := blake2s.New256(nil)
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b2.Write([]byte(mutexLabel))
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b2.Write(norm.NFC.Bytes([]byte(string(pool))))
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mutexName := `Wintun\Wintun-Name-Mutex-` + hex.EncodeToString(b2.Sum(nil))
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mutex, err := windows.CreateMutex(wintunObjectSecurityAttributes, false, windows.StringToUTF16Ptr(mutexName))
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if err != nil {
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err = fmt.Errorf("Error creating name mutex: %v", err)
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return 0, err
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}
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event, err := windows.WaitForSingleObject(mutex, windows.INFINITE)
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if err != nil {
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windows.CloseHandle(mutex)
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return 0, fmt.Errorf("Error waiting on name mutex: %v", err)
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}
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if event != windows.WAIT_OBJECT_0 && event != windows.WAIT_ABANDONED {
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windows.CloseHandle(mutex)
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return 0, errors.New("Error with event trigger of name mutex")
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}
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return mutex, nil
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}
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