go-serviceman/installer/whoami_windows.go

44 lines
1.2 KiB
Go

package installer
import (
"fmt"
"os"
"golang.org/x/sys/windows"
)
func isPrivileged() bool {
var sid *windows.SID
// Although this looks scary, it is directly copied from the
// official windows documentation. The Go API for this is a
// direct wrap around the official C++ API.
// See https://docs.microsoft.com/en-us/windows/desktop/api/securitybaseapi/nf-securitybaseapi-checktokenmembership
err := windows.AllocateAndInitializeSid(
&windows.SECURITY_NT_AUTHORITY,
2,
windows.SECURITY_BUILTIN_DOMAIN_RID,
windows.DOMAIN_ALIAS_RID_ADMINS,
0, 0, 0, 0, 0, 0,
&sid)
if err != nil {
// we don't believe this _can_ return an error with the given inputs
// and if it does, the important info is still the false
fmt.Fprintf(os.Stderr, "warning: Unexpected Windows UserID Error: %s\n", err)
return false
}
// This appears to cast a null pointer so I'm not sure why this
// works, but this guy says it does and it Works for Me™:
// https://github.com/golang/go/issues/28804#issuecomment-438838144
token := windows.Token(0)
isAdmin, err := token.IsMember(sid)
if err != nil {
fmt.Fprintf(os.Stderr, "warning: Unexpected Windows Permission ID Error: %s\n", err)
return false
}
return isAdmin || token.IsElevated()
}