mirror of
https://source.quilibrium.com/quilibrium/ceremonyclient.git
synced 2024-12-28 09:35:17 +00:00
138 lines
3.3 KiB
Go
138 lines
3.3 KiB
Go
package blossomsub
|
|
|
|
import (
|
|
"fmt"
|
|
|
|
"google.golang.org/protobuf/proto"
|
|
pb "source.quilibrium.com/quilibrium/monorepo/go-libp2p-blossomsub/pb"
|
|
|
|
"github.com/libp2p/go-libp2p/core/crypto"
|
|
"github.com/libp2p/go-libp2p/core/peer"
|
|
)
|
|
|
|
// MessageSignaturePolicy describes if signatures are produced, expected, and/or verified.
|
|
type MessageSignaturePolicy uint8
|
|
|
|
// LaxSign and LaxNoSign are deprecated. In the future msgSigning and msgVerification can be unified.
|
|
const (
|
|
// msgSigning is set when the locally produced messages must be signed
|
|
msgSigning MessageSignaturePolicy = 1 << iota
|
|
// msgVerification is set when external messages must be verfied
|
|
msgVerification
|
|
)
|
|
|
|
const (
|
|
// StrictSign produces signatures and expects and verifies incoming signatures
|
|
StrictSign = msgSigning | msgVerification
|
|
// StrictNoSign does not produce signatures and drops and penalises incoming messages that carry one
|
|
StrictNoSign = msgVerification
|
|
// LaxSign produces signatures and validates incoming signatures iff one is present
|
|
LaxSign = msgSigning
|
|
// LaxNoSign does not produce signatures and validates incoming signatures iff one is present
|
|
LaxNoSign = 0
|
|
)
|
|
|
|
// mustVerify is true when a message signature must be verified.
|
|
// If signatures are not expected, verification checks if the signature is absent.
|
|
func (policy MessageSignaturePolicy) mustVerify() bool {
|
|
return policy&msgVerification != 0
|
|
}
|
|
|
|
// mustSign is true when messages should be signed, and incoming messages are expected to have a signature.
|
|
func (policy MessageSignaturePolicy) mustSign() bool {
|
|
return policy&msgSigning != 0
|
|
}
|
|
|
|
const SignPrefix = "libp2p-pubsub:"
|
|
|
|
func verifyMessageSignature(m *pb.Message) error {
|
|
pubk, err := messagePubKey(m)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
xm := (proto.Clone(m)).(*pb.Message)
|
|
xm.Signature = nil
|
|
xm.Key = nil
|
|
bytes, err := xm.Marshal()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
bytes = withSignPrefix(bytes)
|
|
|
|
valid, err := pubk.Verify(bytes, m.Signature)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if !valid {
|
|
return fmt.Errorf("invalid signature")
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func messagePubKey(m *pb.Message) (crypto.PubKey, error) {
|
|
var pubk crypto.PubKey
|
|
|
|
pid, err := peer.IDFromBytes(m.From)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
|
|
if m.Key == nil {
|
|
// no attached key, it must be extractable from the source ID
|
|
pubk, err = pid.ExtractPublicKey()
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot extract signing key: %s", err.Error())
|
|
}
|
|
if pubk == nil {
|
|
return nil, fmt.Errorf("cannot extract signing key")
|
|
}
|
|
} else {
|
|
pubk, err = crypto.UnmarshalPublicKey(m.Key)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("cannot unmarshal signing key: %s", err.Error())
|
|
}
|
|
|
|
// verify that the source ID matches the attached key
|
|
if !pid.MatchesPublicKey(pubk) {
|
|
return nil, fmt.Errorf("bad signing key; source ID %s doesn't match key", pid)
|
|
}
|
|
}
|
|
|
|
return pubk, nil
|
|
}
|
|
|
|
func signMessage(pid peer.ID, key crypto.PrivKey, m *pb.Message) error {
|
|
bytes, err := m.Marshal()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
bytes = withSignPrefix(bytes)
|
|
|
|
sig, err := key.Sign(bytes)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
m.Signature = sig
|
|
|
|
pk, _ := pid.ExtractPublicKey()
|
|
if pk == nil {
|
|
pubk, err := crypto.MarshalPublicKey(key.GetPublic())
|
|
if err != nil {
|
|
return err
|
|
}
|
|
m.Key = pubk
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func withSignPrefix(bytes []byte) []byte {
|
|
return append([]byte(SignPrefix), bytes...)
|
|
}
|