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/* SPDX-License-Identifier: MIT
*
* Copyright (C) 2019 WireGuard LLC. All Rights Reserved.
*/
package updater
import (
"crypto/rand"
"encoding/hex"
"errors"
"github.com/Microsoft/go-winio"
"golang.org/x/sys/windows"
"os"
"os/exec"
"path"
"runtime"
"syscall"
"unsafe"
)
func runMsi(msiPath string, userToken uintptr, env []string) error {
system32, err := windows.GetSystemDirectory()
if err != nil {
return err
}
devNull, err := os.OpenFile(os.DevNull, os.O_RDWR, 0)
if err != nil {
return err
}
defer devNull.Close()
attr := &os.ProcAttr{
Sys: &syscall.SysProcAttr{
Token: syscall.Token(userToken),
},
Files: []*os.File{devNull, devNull, devNull},
Env: env,
Dir: path.Dir(msiPath),
}
msiexec := path.Join(system32, "msiexec.exe")
proc, err := os.StartProcess(msiexec, []string{msiexec, "/qb!-", "/i", path.Base(msiPath)}, attr)
if err != nil {
return err
}
state, err := proc.Wait()
if err != nil {
return err
}
if !state.Success() {
return &exec.ExitError{ProcessState: state}
}
return nil
}
func msiTempFile() (*os.File, error) {
var randBytes [32]byte
n, err := rand.Read(randBytes[:])
if err != nil {
return nil, err
}
if n != int(len(randBytes)) {
return nil, errors.New("Unable to generate random bytes")
}
sd, err := winio.SddlToSecurityDescriptor("O:SYD:PAI(A;;FA;;;SY)(A;;FR;;;BA)")
if err != nil {
return nil, err
}
sa := &windows.SecurityAttributes{
Length: uint32(len(sd)),
SecurityDescriptor: uintptr(unsafe.Pointer(&sd[0])),
}
//TODO: os.TempDir() returns C:\windows\temp when calling from this context. Supposedly this is mostly secure
// against TOCTOU, but who knows! Look into this!
name := path.Join(os.TempDir(), hex.EncodeToString(randBytes[:]))
name16 := windows.StringToUTF16Ptr(name)
//TODO: it would be nice to specify delete_on_close, but msiexec.exe doesn't open its files with read sharing.
fileHandle, err := windows.CreateFile(name16, windows.GENERIC_WRITE, windows.FILE_SHARE_READ, sa, windows.CREATE_NEW, windows.FILE_ATTRIBUTE_NORMAL, 0)
runtime.KeepAlive(sd)
if err != nil {
return nil, err
}
windows.MoveFileEx(name16, nil, windows.MOVEFILE_DELAY_UNTIL_REBOOT)
return os.NewFile(uintptr(fileHandle), name), nil
}
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