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package main
import (
"log"
"os"
"os/exec"
"github.com/syndtr/gocapability/capability"
)
func getCurrentCaps() *capability.Capabilities {
caps, err := capability.NewPid2(0)
if err != nil {
log.Fatalf("Could not get self caps: %+v\n", err)
}
err = caps.Load()
if err != nil {
log.Fatalf("Could not load self caps: %+v\n", err)
}
return &caps
}
func getSelfFileCaps() *capability.Capabilities {
self, err := os.Executable()
log.Printf("Getting caps for: %s\n", self)
if err != nil {
log.Fatalf("Could not get path to own executable: %+v\n", err)
}
caps, err := capability.NewFile2(self)
if err != nil {
log.Fatalf("Could not get file caps: %+v\n", err)
}
err = caps.Load()
if err != nil {
log.Fatalf("Could not load file caps: %+v\n", err)
}
return &caps
}
func hasCapSysResource(caps *capability.Capabilities) bool {
return (*caps).Get(capability.EFFECTIVE, capability.CAP_SYS_RESOURCE)
}
func makeBinarySetcapped() error {
fileCaps := *getSelfFileCaps()
if !hasCapSysResource(&fileCaps) {
fileCaps.Set(capability.EFFECTIVE|capability.PERMITTED|capability.INHERITABLE, capability.CAP_SYS_RESOURCE)
err := fileCaps.Apply(capability.EFFECTIVE | capability.PERMITTED | capability.INHERITABLE)
if err != nil {
return err
}
}
return nil
}
func pkexecSetcapSelf() error {
self, err := os.Executable()
if err != nil {
log.Fatalf("Couldn't find path to own binary\n")
return err
}
cmd := exec.Command("pkexec", self, "-setcap")
log.Printf("Calling: %s\n", cmd.String())
err = cmd.Run()
if err != nil {
log.Printf("Couldn't setcap self as root: %v\n", err)
return err
}
return nil
}
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