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certstore.go
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certstore.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package gossip
import (
"bytes"
"github.com/hyperledger/fabric/gossip/api"
"github.com/hyperledger/fabric/gossip/common"
"github.com/hyperledger/fabric/gossip/gossip/pull"
"github.com/hyperledger/fabric/gossip/identity"
"github.com/hyperledger/fabric/gossip/util"
proto "github.com/hyperledger/fabric/protos/gossip"
"github.com/op/go-logging"
"github.com/pkg/errors"
)
// certStore supports pull dissemination of identity messages
type certStore struct {
selfIdentity api.PeerIdentityType
idMapper identity.Mapper
pull pull.Mediator
logger *logging.Logger
mcs api.MessageCryptoService
}
func newCertStore(puller pull.Mediator, idMapper identity.Mapper, selfIdentity api.PeerIdentityType, mcs api.MessageCryptoService) *certStore {
selfPKIID := idMapper.GetPKIidOfCert(selfIdentity)
logger := util.GetLogger(util.LoggingGossipModule, string(selfPKIID))
certStore := &certStore{
mcs: mcs,
pull: puller,
idMapper: idMapper,
selfIdentity: selfIdentity,
logger: logger,
}
if err := certStore.idMapper.Put(selfPKIID, selfIdentity); err != nil {
certStore.logger.Panicf("Failed associating self PKIID to cert: %+v", errors.WithStack(err))
}
selfIdMsg, err := certStore.createIdentityMessage()
if err != nil {
certStore.logger.Panicf("Failed creating self identity message: %+v", errors.WithStack(err))
}
puller.Add(selfIdMsg)
puller.RegisterMsgHook(pull.RequestMsgType, func(_ []string, msgs []*proto.SignedGossipMessage, _ proto.ReceivedMessage) {
for _, msg := range msgs {
pkiID := common.PKIidType(msg.GetPeerIdentity().PkiId)
cert := api.PeerIdentityType(msg.GetPeerIdentity().Cert)
if err := certStore.idMapper.Put(pkiID, cert); err != nil {
certStore.logger.Warningf("Failed adding identity %v, reason %+v", cert, errors.WithStack(err))
}
}
})
return certStore
}
func (cs *certStore) handleMessage(msg proto.ReceivedMessage) {
if update := msg.GetGossipMessage().GetDataUpdate(); update != nil {
for _, env := range update.Data {
m, err := env.ToGossipMessage()
if err != nil {
cs.logger.Warningf("Data update contains an invalid message: %+v", errors.WithStack(err))
return
}
if !m.IsIdentityMsg() {
cs.logger.Warning("Got a non-identity message:", m, "aborting")
return
}
if err := cs.validateIdentityMsg(m); err != nil {
cs.logger.Warningf("Failed validating identity message: %+v", errors.WithStack(err))
return
}
}
}
cs.pull.HandleMessage(msg)
}
func (cs *certStore) validateIdentityMsg(msg *proto.SignedGossipMessage) error {
idMsg := msg.GetPeerIdentity()
if idMsg == nil {
return errors.Errorf("Identity empty: %+v", msg)
}
pkiID := idMsg.PkiId
cert := idMsg.Cert
calculatedPKIID := cs.mcs.GetPKIidOfCert(api.PeerIdentityType(cert))
claimedPKIID := common.PKIidType(pkiID)
if !bytes.Equal(calculatedPKIID, claimedPKIID) {
return errors.Errorf("Calculated pkiID doesn't match identity: calculated: %v, claimedPKI-ID: %v", calculatedPKIID, claimedPKIID)
}
verifier := func(peerIdentity []byte, signature, message []byte) error {
return cs.mcs.Verify(api.PeerIdentityType(peerIdentity), signature, message)
}
err := msg.Verify(cert, verifier)
if err != nil {
return errors.Wrap(err, "Failed verifying message")
}
return cs.mcs.ValidateIdentity(api.PeerIdentityType(idMsg.Cert))
}
func (cs *certStore) createIdentityMessage() (*proto.SignedGossipMessage, error) {
pi := &proto.PeerIdentity{
Cert: cs.selfIdentity,
Metadata: nil,
PkiId: cs.idMapper.GetPKIidOfCert(cs.selfIdentity),
}
m := &proto.GossipMessage{
Channel: nil,
Nonce: 0,
Tag: proto.GossipMessage_EMPTY,
Content: &proto.GossipMessage_PeerIdentity{
PeerIdentity: pi,
},
}
signer := func(msg []byte) ([]byte, error) {
return cs.idMapper.Sign(msg)
}
sMsg := &proto.SignedGossipMessage{
GossipMessage: m,
}
_, err := sMsg.Sign(signer)
return sMsg, errors.WithStack(err)
}
func (cs *certStore) suspectPeers(isSuspected api.PeerSuspector) {
cs.idMapper.SuspectPeers(isSuspected)
}
func (cs *certStore) stop() {
cs.pull.Stop()
cs.idMapper.Stop()
}