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package signature
import (
"bytes"
"io"
"reflect"
"github.com/foxboron/go-uefi/efi/util"
"github.com/pkg/errors"
)
// SignatureDatabase is a list of EFI signature lists
type SignatureDatabase []*SignatureList
var ErrNotFoundSigList = errors.New("signature list not found")
func NewSignatureDatabase() *SignatureDatabase {
return &SignatureDatabase{}
}
// Checks if all signatures in a list is present in the signature database
func (sd *SignatureDatabase) SigDataExists(certtype util.EFIGUID, sigdata *SignatureData) bool {
for _, sdsiglist := range *sd {
if ok, _ := sdsiglist.Exists(sigdata); ok {
return true
}
}
return false
}
// Checks if all signatures in a list is present in the signature database
func (sd *SignatureDatabase) Exists(certtype util.EFIGUID, siglist *SignatureList) bool {
for _, sdsiglist := range *sd {
if !sdsiglist.CmpHeader(siglist) {
continue
}
return sdsiglist.ExistsInList(siglist)
}
return false
}
// Checks if the bytes in a list is present in the signature database
func (sd *SignatureDatabase) BytesExists(certtype util.EFIGUID, owner util.EFIGUID, data []byte) bool {
return sd.SigDataExists(certtype, &SignatureData{Owner: owner, Data: data})
}
// Appends the raw signature values to the database
func (sd *SignatureDatabase) Append(certtype util.EFIGUID, owner util.EFIGUID, data []byte) error {
if _, ok := ValidEFISignatureSchemes[certtype]; !ok {
return ErrNoSuchSignatureScheme
}
for _, l := range *sd {
if !util.CmpEFIGUID(l.SignatureType, certtype) {
continue
}
size := uint32(len(data)) + util.SizeofEFIGUID
if size != l.Size {
continue
}
if err := l.AppendSignature(SignatureData{Owner: owner, Data: data}); err != nil {
return err
}
return nil
}
sl := NewSignatureList(certtype)
if err := sl.AppendBytes(owner, data); err != nil {
return err
}
*sd = append(*sd, sl)
return nil
}
// Appends a signaure to the database. It will scan the database for the appropriate list to append
// itself to.
func (sd *SignatureDatabase) AppendSignature(certtype util.EFIGUID, sl *SignatureData) error {
return sd.Append(certtype, sl.Owner, sl.Data)
}
// Appends a signature list to the database
// TODO: Should merge towards a fitting list?
func (sd *SignatureDatabase) AppendList(sl *SignatureList) {
*sd = append(*sd, sl)
}
// Appends a signature database
func (sd *SignatureDatabase) AppendDatabase(s *SignatureDatabase) {
for _, list := range *s {
sd.AppendList(list)
}
}
// Remove the raw signature values to the database
func (sd *SignatureDatabase) Remove(certtype util.EFIGUID, owner util.EFIGUID, data []byte) error {
// We might want to differentiate between not finding a list for the type and
// not finding appropriate sigdata in the different lists.
nosigdata := false
for _, l := range *sd {
if !util.CmpEFIGUID(l.SignatureType, certtype) {
continue
}
size := uint32(len(data)) + util.SizeofEFIGUID
if size != l.Size {
continue
}
if err := l.RemoveBytes(owner, data); errors.Is(err, ErrNotFoundSigData) {
nosigdata = true
continue
}
if len(l.Signatures) == 0 {
return sd.RemoveList(l)
}
return nil
}
if nosigdata {
return ErrNotFoundSigData
}
return ErrNotFoundSigList
}
// Removes a signaure to the database. It will scan available lists for something to remove
func (sd *SignatureDatabase) RemoveSignature(certtype util.EFIGUID, sl *SignatureData) error {
return sd.Remove(certtype, sl.Owner, sl.Data)
}
func (sd *SignatureDatabase) removeslice(index int) {
if len(*sd) == 1 {
*sd = SignatureDatabase{}
return
}
*sd = append((*sd)[:index], (*sd)[index+1:]...)
}
// Removes a signature list from the database
func (sd *SignatureDatabase) RemoveList(sl *SignatureList) error {
for index, siglist := range *sd {
if reflect.DeepEqual(sl, siglist) {
sd.removeslice(index)
return nil
}
}
return ErrNotFoundSigList
}
// Serialize the Signature Database into bytes
func (sd *SignatureDatabase) Bytes() []byte {
buf := new(bytes.Buffer)
WriteSignatureDatabase(buf, *sd)
return buf.Bytes()
}
func (sd *SignatureDatabase) Marshal(b *bytes.Buffer) {
WriteSignatureDatabase(b, *sd)
}
func (sd *SignatureDatabase) Unmarshal(b *bytes.Buffer) error {
s, err := ReadSignatureDatabase(b)
if err != nil {
return err
}
*sd = s
return nil
}
// Write a signature database which contains a slice of SignautureLists
func WriteSignatureDatabase(b io.Writer, sigdb SignatureDatabase) {
for _, l := range sigdb {
WriteSignatureList(b, *l)
}
}
// Reads several signature lists from a io.Reader. It assumes io.EOF means there
// are no more signatures to read as opposed to an actual issue
func ReadSignatureDatabase(f io.Reader) (SignatureDatabase, error) {
siglist := []*SignatureList{}
for {
sig, err := ReadSignatureList(f)
if errors.Is(err, io.EOF) {
break
} else if err != nil {
return siglist, errors.Wrapf(err, "failed to parse signature lists")
}
siglist = append(siglist, sig)
}
return siglist, nil
}
|
