// FinalizeNamespace drops the caps, sets the correct user
// and working dir, and closes any leaky file descriptors
// before execing the command inside the namespace
func FinalizeNamespace(container *libcontainer.Container) error {
if err := system.CloseFdsFrom(3); err != nil {
return fmt.Errorf("close open file descriptors %s", err)
}
// drop capabilities in bounding set before changing user
if err := capabilities.DropBoundingSet(container); err != nil {
return fmt.Errorf("drop bounding set %s", err)
}
// preserve existing capabilities while we change users
if err := system.SetKeepCaps(); err != nil {
return fmt.Errorf("set keep caps %s", err)
}
if err := SetupUser(container.User); err != nil {
return fmt.Errorf("setup user %s", err)
}
if err := system.ClearKeepCaps(); err != nil {
return fmt.Errorf("clear keep caps %s", err)
}
// drop all other capabilities
if err := capabilities.DropCapabilities(container); err != nil {
return fmt.Errorf("drop capabilities %s", err)
}
if container.WorkingDir != "" {
if err := system.Chdir(container.WorkingDir); err != nil {
return fmt.Errorf("chdir to %s %s", container.WorkingDir, err)
}
}
return nil
}
func init() {
execdriver.RegisterInitFunc(DriverName, func(args *execdriver.InitArgs) error {
if err := setupEnv(args); err != nil {
return err
}
if err := setupHostname(args); err != nil {
return err
}
if err := setupNetworking(args); err != nil {
return err
}
if err := setupCapabilities(args); err != nil {
return err
}
if err := setupWorkingDirectory(args); err != nil {
return err
}
if err := system.CloseFdsFrom(3); err != nil {
return err
}
if err := changeUser(args); err != nil {
return err
}
path, err := exec.LookPath(args.Args[0])
if err != nil {
log.Printf("Unable to locate %v", args.Args[0])
os.Exit(127)
}
if err := syscall.Exec(path, args.Args, os.Environ()); err != nil {
return fmt.Errorf("dockerinit unable to execute %s - %s", path, err)
}
panic("Unreachable")
})
}
// FinalizeNamespace drops the caps, sets the correct user
// and working dir, and closes any leaky file descriptors
// before execing the command inside the namespace
func FinalizeNamespace(container *libcontainer.Container) error {
if err := capabilities.DropCapabilities(container); err != nil {
return fmt.Errorf("drop capabilities %s", err)
}
if err := system.CloseFdsFrom(3); err != nil {
return fmt.Errorf("close open file descriptors %s", err)
}
if err := SetupUser(container.User); err != nil {
return fmt.Errorf("setup user %s", err)
}
if container.WorkingDir != "" {
if err := system.Chdir(container.WorkingDir); err != nil {
return fmt.Errorf("chdir to %s %s", container.WorkingDir, err)
}
}
return nil
}
