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service.go
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service.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package discovery
import (
"bytes"
"context"
"encoding/hex"
"fmt"
"github.com/hyperledger/fabric-protos-go/discovery"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/common/util"
"github.com/hyperledger/fabric/discovery/protoext"
common2 "github.com/hyperledger/fabric/gossip/common"
discovery2 "github.com/hyperledger/fabric/gossip/discovery"
"github.com/hyperledger/fabric/internal/pkg/comm"
"github.com/hyperledger/fabric/protoutil"
"github.com/pkg/errors"
)
var (
logger = flogging.MustGetLogger("discovery")
)
var accessDenied = wrapError(errors.New("access denied"))
// certHashExtractor extracts the TLS certificate from a given context
// and returns its hash
type certHashExtractor func(ctx context.Context) []byte
// dispatcher defines a function that dispatches a query
type dispatcher func(q *discovery.Query) *discovery.QueryResult
type service struct {
config Config
channelDispatchers map[protoext.QueryType]dispatcher
localDispatchers map[protoext.QueryType]dispatcher
auth *authCache
Support
}
// Config defines the configuration of the discovery service
type Config struct {
TLS bool
AuthCacheEnabled bool
AuthCacheMaxSize int
AuthCachePurgeRetentionRatio float64
}
// String returns a string representation of this Config
func (c Config) String() string {
if c.AuthCacheEnabled {
return fmt.Sprintf("TLS: %t, authCacheMaxSize: %d, authCachePurgeRatio: %f", c.TLS, c.AuthCacheMaxSize, c.AuthCachePurgeRetentionRatio)
}
return fmt.Sprintf("TLS: %t, auth cache disabled", c.TLS)
}
// peerMapping maps PKI-IDs to Peers
type peerMapping map[string]*discovery.Peer
// NewService creates a new discovery service instance
func NewService(config Config, sup Support) *service {
s := &service{
auth: newAuthCache(sup, authCacheConfig{
enabled: config.AuthCacheEnabled,
maxCacheSize: config.AuthCacheMaxSize,
purgeRetentionRatio: config.AuthCachePurgeRetentionRatio,
}),
Support: sup,
}
s.channelDispatchers = map[protoext.QueryType]dispatcher{
protoext.ConfigQueryType: s.configQuery,
protoext.ChaincodeQueryType: s.chaincodeQuery,
protoext.PeerMembershipQueryType: s.channelMembershipResponse,
}
s.localDispatchers = map[protoext.QueryType]dispatcher{
protoext.LocalMembershipQueryType: s.localMembershipResponse,
}
logger.Info("Created with config", config)
return s
}
func (s *service) Discover(ctx context.Context, request *discovery.SignedRequest) (*discovery.Response, error) {
addr := util.ExtractRemoteAddress(ctx)
req, err := validateStructure(ctx, request, s.config.TLS, comm.ExtractCertificateHashFromContext)
if err != nil {
logger.Warningf("Request from %s is malformed or invalid: %v", addr, err)
return nil, err
}
logger.Debugf("Processing request from %s: %v", addr, req)
var res []*discovery.QueryResult
for _, q := range req.Queries {
res = append(res, s.processQuery(q, request, req.Authentication.ClientIdentity, addr))
}
logger.Debugf("Returning to %s a response containing: %v", addr, res)
return &discovery.Response{
Results: res,
}, nil
}
func (s *service) processQuery(query *discovery.Query, request *discovery.SignedRequest, identity []byte, addr string) *discovery.QueryResult {
if query.Channel != "" && !s.ChannelExists(query.Channel) {
logger.Warning("got query for channel", query.Channel, "from", addr, "but it doesn't exist")
return accessDenied
}
if err := s.auth.EligibleForService(query.Channel, protoutil.SignedData{
Data: request.Payload,
Signature: request.Signature,
Identity: identity,
}); err != nil {
logger.Warning("got query for channel", query.Channel, "from", addr, "but it isn't eligible:", err)
return accessDenied
}
return s.dispatch(query)
}
func (s *service) dispatch(q *discovery.Query) *discovery.QueryResult {
dispatchers := s.channelDispatchers
// Ensure local queries are routed only to channel-less dispatchers
if q.Channel == "" {
dispatchers = s.localDispatchers
}
dispatchQuery, exists := dispatchers[protoext.GetQueryType(q)]
if !exists {
return wrapError(errors.New("unknown or missing request type"))
}
return dispatchQuery(q)
}
func (s *service) chaincodeQuery(q *discovery.Query) *discovery.QueryResult {
if err := validateCCQuery(q.GetCcQuery()); err != nil {
return wrapError(err)
}
var descriptors []*discovery.EndorsementDescriptor
for _, interest := range q.GetCcQuery().Interests {
desc, err := s.PeersForEndorsement(common2.ChannelID(q.Channel), interest)
if err != nil {
logger.Errorf("Failed constructing descriptor for chaincode %s,: %v", interest, err)
return wrapError(errors.Errorf("failed constructing descriptor for %v", interest))
}
descriptors = append(descriptors, desc)
}
return &discovery.QueryResult{
Result: &discovery.QueryResult_CcQueryRes{
CcQueryRes: &discovery.ChaincodeQueryResult{
Content: descriptors,
},
},
}
}
func (s *service) configQuery(q *discovery.Query) *discovery.QueryResult {
conf, err := s.Config(q.Channel)
if err != nil {
logger.Errorf("Failed fetching config for channel %s: %v", q.Channel, err)
return wrapError(errors.Errorf("failed fetching config for channel %s", q.Channel))
}
return &discovery.QueryResult{
Result: &discovery.QueryResult_ConfigResult{
ConfigResult: conf,
},
}
}
func wrapPeerResponse(peersByOrg map[string]*discovery.Peers) *discovery.QueryResult {
return &discovery.QueryResult{
Result: &discovery.QueryResult_Members{
Members: &discovery.PeerMembershipResult{
PeersByOrg: peersByOrg,
},
},
}
}
func (s *service) channelMembershipResponse(q *discovery.Query) *discovery.QueryResult {
chanPeers, err := s.PeersAuthorizedByCriteria(common2.ChannelID(q.Channel), q.GetPeerQuery().Filter)
if err != nil {
return wrapError(err)
}
membersByOrgs := make(map[string]*discovery.Peers)
chanPeerByID := discovery2.Members(chanPeers).ByID()
for org, ids2Peers := range s.computeMembership(q) {
membersByOrgs[org] = &discovery.Peers{}
for id, peer := range ids2Peers {
// Check if the peer is in the channel view
stateInfoMsg, exists := chanPeerByID[string(id)]
// If the peer isn't in the channel view, skip it and don't include it in the response
if !exists {
continue
}
peer.StateInfo = stateInfoMsg.Envelope
membersByOrgs[org].Peers = append(membersByOrgs[org].Peers, peer)
}
}
return wrapPeerResponse(membersByOrgs)
}
func (s *service) localMembershipResponse(q *discovery.Query) *discovery.QueryResult {
membersByOrgs := make(map[string]*discovery.Peers)
for org, ids2Peers := range s.computeMembership(q) {
membersByOrgs[org] = &discovery.Peers{}
for _, peer := range ids2Peers {
membersByOrgs[org].Peers = append(membersByOrgs[org].Peers, peer)
}
}
return wrapPeerResponse(membersByOrgs)
}
func (s *service) computeMembership(_ *discovery.Query) map[string]peerMapping {
peersByOrg := make(map[string]peerMapping)
peerAliveInfo := discovery2.Members(s.Peers()).ByID()
for org, peerIdentities := range s.IdentityInfo().ByOrg() {
peersForCurrentOrg := make(peerMapping)
peersByOrg[org] = peersForCurrentOrg
for _, id := range peerIdentities {
// Check peer exists in alive membership view
aliveInfo, exists := peerAliveInfo[string(id.PKIId)]
if !exists {
continue
}
peersForCurrentOrg[string(id.PKIId)] = &discovery.Peer{
Identity: id.Identity,
MembershipInfo: aliveInfo.Envelope,
}
}
}
return peersByOrg
}
// validateStructure validates that the request contains all the needed fields and that they are computed correctly
func validateStructure(ctx context.Context, request *discovery.SignedRequest, tlsEnabled bool, certHashFromContext certHashExtractor) (*discovery.Request, error) {
if request == nil {
return nil, errors.New("nil request")
}
req, err := protoext.SignedRequestToRequest(request)
if err != nil {
return nil, errors.Wrap(err, "failed parsing request")
}
if req.Authentication == nil {
return nil, errors.New("access denied, no authentication info in request")
}
if len(req.Authentication.ClientIdentity) == 0 {
return nil, errors.New("access denied, client identity wasn't supplied")
}
if !tlsEnabled {
return req, nil
}
computedHash := certHashFromContext(ctx)
if len(computedHash) == 0 {
return nil, errors.New("client didn't send a TLS certificate")
}
if !bytes.Equal(computedHash, req.Authentication.ClientTlsCertHash) {
claimed := hex.EncodeToString(req.Authentication.ClientTlsCertHash)
logger.Warningf("client claimed TLS hash %s doesn't match computed TLS hash from gRPC stream %s", claimed, hex.EncodeToString(computedHash))
return nil, errors.New("client claimed TLS hash doesn't match computed TLS hash from gRPC stream")
}
return req, nil
}
func validateCCQuery(ccQuery *discovery.ChaincodeQuery) error {
if len(ccQuery.Interests) == 0 {
return errors.New("chaincode query must have at least one chaincode interest")
}
for _, interest := range ccQuery.Interests {
if interest == nil {
return errors.New("chaincode interest is nil")
}
if len(interest.Chaincodes) == 0 {
return errors.New("chaincode interest must contain at least one chaincode")
}
for _, cc := range interest.Chaincodes {
if cc.Name == "" {
return errors.New("chaincode name in interest cannot be empty")
}
}
}
return nil
}
func wrapError(err error) *discovery.QueryResult {
return &discovery.QueryResult{
Result: &discovery.QueryResult_Error{
Error: &discovery.Error{
Content: err.Error(),
},
},
}
}