133 lines
3.2 KiB
Go
133 lines
3.2 KiB
Go
package object
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto/ecdsa"
|
|
"crypto/sha256"
|
|
|
|
crypto "github.com/nspcc-dev/neofs-crypto"
|
|
"github.com/pkg/errors"
|
|
)
|
|
|
|
func (m Object) headersData(check bool) ([]byte, error) {
|
|
var bytebuf = new(bytes.Buffer)
|
|
|
|
// fixme: we must marshal fields one by one without protobuf marshaling
|
|
// protobuf marshaling does not guarantee the same result
|
|
|
|
if sysheader, err := m.SystemHeader.Marshal(); err != nil {
|
|
return nil, err
|
|
} else if _, err := bytebuf.Write(sysheader); err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
n, _ := m.LastHeader(HeaderType(IntegrityHdr))
|
|
for i := range m.Headers {
|
|
if check && i == n {
|
|
// ignore last integrity header in order to check headers data
|
|
continue
|
|
}
|
|
|
|
if header, err := m.Headers[i].Marshal(); err != nil {
|
|
return nil, err
|
|
} else if _, err := bytebuf.Write(header); err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return bytebuf.Bytes(), nil
|
|
}
|
|
|
|
func (m Object) headersChecksum(check bool) ([]byte, error) {
|
|
data, err := m.headersData(check)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
checksum := sha256.Sum256(data)
|
|
return checksum[:], nil
|
|
}
|
|
|
|
// PayloadChecksum calculates sha256 checksum of object payload.
|
|
func (m Object) PayloadChecksum() []byte {
|
|
checksum := sha256.Sum256(m.Payload)
|
|
return checksum[:]
|
|
}
|
|
|
|
func (m Object) verifySignature(key []byte, ih *IntegrityHeader) error {
|
|
pk := crypto.UnmarshalPublicKey(key)
|
|
if crypto.Verify(pk, ih.HeadersChecksum, ih.ChecksumSignature) == nil {
|
|
return nil
|
|
}
|
|
return ErrVerifySignature
|
|
}
|
|
|
|
// Verify performs local integrity check by finding verification header and
|
|
// integrity header. If header integrity is passed, function verifies
|
|
// checksum of the object payload.
|
|
func (m Object) Verify() error {
|
|
var (
|
|
err error
|
|
checksum []byte
|
|
)
|
|
// Prepare structures
|
|
_, vh := m.LastHeader(HeaderType(VerifyHdr))
|
|
if vh == nil {
|
|
return ErrHeaderNotFound
|
|
}
|
|
verify := vh.Value.(*Header_Verify).Verify
|
|
|
|
_, ih := m.LastHeader(HeaderType(IntegrityHdr))
|
|
if ih == nil {
|
|
return ErrHeaderNotFound
|
|
}
|
|
integrity := ih.Value.(*Header_Integrity).Integrity
|
|
|
|
// Verify signature
|
|
err = m.verifySignature(verify.PublicKey, integrity)
|
|
if err != nil {
|
|
return errors.Wrapf(err, "public key: %x", verify.PublicKey)
|
|
}
|
|
|
|
// Verify checksum of header
|
|
checksum, err = m.headersChecksum(true)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if !bytes.Equal(integrity.HeadersChecksum, checksum) {
|
|
return ErrVerifyHeader
|
|
}
|
|
|
|
// Verify checksum of payload
|
|
if m.SystemHeader.PayloadLength > 0 && !m.IsLinking() {
|
|
checksum = m.PayloadChecksum()
|
|
|
|
_, ph := m.LastHeader(HeaderType(PayloadChecksumHdr))
|
|
if ph == nil {
|
|
return ErrHeaderNotFound
|
|
}
|
|
if !bytes.Equal(ph.Value.(*Header_PayloadChecksum).PayloadChecksum, checksum) {
|
|
return ErrVerifyPayload
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// Sign creates new integrity header and adds it to the end of the list of
|
|
// extended headers.
|
|
func (m *Object) Sign(key *ecdsa.PrivateKey) error {
|
|
headerChecksum, err := m.headersChecksum(false)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
headerChecksumSignature, err := crypto.Sign(key, headerChecksum)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
m.AddHeader(&Header{Value: &Header_Integrity{
|
|
Integrity: &IntegrityHeader{
|
|
HeadersChecksum: headerChecksum,
|
|
ChecksumSignature: headerChecksumSignature,
|
|
},
|
|
}})
|
|
return nil
|
|
}
|