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package efivarfs
import (
"bytes"
"crypto"
"crypto/x509"
"encoding/binary"
"fmt"
"github.com/foxboron/go-uefi/efi/device"
"github.com/foxboron/go-uefi/efi/signature"
"github.com/foxboron/go-uefi/efivar"
)
// This is the high-level abstraction of efivarfs. It gives you the easy
// variable access and auxillary functions you should expect from a library like
// this.
type Efivarfs struct {
EFIVars
}
func Open(e EFIVars) *Efivarfs {
return &Efivarfs{e}
}
func (e *Efivarfs) GetPK() (*signature.SignatureDatabase, error) {
var rsb signature.SignatureDatabase
if err := e.GetVar(efivar.PK, &rsb); err != nil {
return nil, err
}
return &rsb, nil
}
func (e *Efivarfs) GetSetupMode() (bool, error) {
var rsb efibool
if err := e.GetVar(efivar.SetupMode, &rsb); err != nil {
return false, err
}
return (bool)(rsb), nil
}
func (e *Efivarfs) GetSecureBoot() (bool, error) {
var rsb efibool
if err := e.GetVar(efivar.SecureBoot, &rsb); err != nil {
return false, err
}
return (bool)(rsb), nil
}
func (e *Efivarfs) GetKEK() (*signature.SignatureDatabase, error) {
var rsb signature.SignatureDatabase
if err := e.GetVar(efivar.KEK, &rsb); err != nil {
return nil, err
}
return &rsb, nil
}
func (e *Efivarfs) Getdb() (*signature.SignatureDatabase, error) {
var rsb signature.SignatureDatabase
if err := e.GetVar(efivar.Db, &rsb); err != nil {
return nil, err
}
return &rsb, nil
}
func (e *Efivarfs) Getdbx() (*signature.SignatureDatabase, error) {
var rsb signature.SignatureDatabase
if err := e.GetVar(efivar.Dbx, &rsb); err != nil {
return nil, err
}
return &rsb, nil
}
// Writes a signed variable update
func (e *Efivarfs) WriteSignedUpdate(v efivar.Efivar, m efivar.Marshallable, key crypto.Signer, cert *x509.Certificate) error {
// The reason why we do this is because we are wrapping a bytes.Butter in a
// marshaller interface to pass through the layers
// I haven't decided if this is.. elegant or not.
_, marshal, err := signature.SignEFIVariable(v, m, key, cert)
if err != nil {
return err
}
return e.WriteVar(v, marshal)
}
func (e *Efivarfs) GetBootEntry(option string) (*device.EFILoadOption, error) {
var rsb device.EFILoadOption
entry := efivar.BootEntry
entry.Name = option
if err := e.GetVar(entry, &rsb); err != nil {
return nil, err
}
return &rsb, nil
}
type bootorder []string
func (bo *bootorder) Unmarshal(b *bytes.Buffer) error {
for i := 0; b.Len() != 0; i += 2 {
sec := make([]byte, 2)
b.Read(sec)
val := binary.BigEndian.Uint16([]byte{sec[1], sec[0]})
*bo = append(*bo, fmt.Sprintf("Boot%04x", val))
}
return nil
}
func (e *Efivarfs) GetBootOrder() []string {
var rsb bootorder
if err := e.GetVar(efivar.BootOrder, &rsb); err != nil {
return nil
}
return rsb
}
func (e *Efivarfs) GetLoaderEntrySelected() (string, error) {
var rsb efivar.Efistring
if err := e.GetVar(efivar.LoaderEntrySelected, &rsb); err != nil {
return "", err
}
return string(rsb), nil
}
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