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connection.go
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connection.go
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/*
Copyright IBM Corp. All Rights Reserved.
SPDX-License-Identifier: Apache-2.0
*/
package comm
import (
"crypto/tls"
"crypto/x509"
"encoding/base64"
"encoding/pem"
"fmt"
"io/ioutil"
"os"
"sync"
"time"
"github.com/hyperledger/fabric/common/flogging"
"github.com/hyperledger/fabric/core/config"
"github.com/spf13/viper"
"golang.org/x/net/context"
"google.golang.org/grpc"
"google.golang.org/grpc/credentials"
"google.golang.org/grpc/grpclog"
)
const defaultTimeout = time.Second * 3
var commLogger = flogging.MustGetLogger("comm")
var credSupport *CredentialSupport
var once sync.Once
// CASupport type manages certificate authorities scoped by channel
type CASupport struct {
sync.RWMutex
AppRootCAsByChain map[string][][]byte
OrdererRootCAsByChain map[string][][]byte
ClientRootCAs [][]byte
ServerRootCAs [][]byte
}
// CredentialSupport type manages credentials used for gRPC client connections
type CredentialSupport struct {
*CASupport
ClientCert tls.Certificate
}
// GetCredentialSupport returns the singleton CredentialSupport instance
func GetCredentialSupport() *CredentialSupport {
once.Do(func() {
credSupport = &CredentialSupport{
CASupport: &CASupport{
AppRootCAsByChain: make(map[string][][]byte),
OrdererRootCAsByChain: make(map[string][][]byte),
},
}
})
return credSupport
}
// GetServerRootCAs returns the PEM-encoded root certificates for all of the
// application and orderer organizations defined for all chains. The root
// certificates returned should be used to set the trusted server roots for
// TLS clients.
func (cas *CASupport) GetServerRootCAs() (appRootCAs, ordererRootCAs [][]byte) {
cas.RLock()
defer cas.RUnlock()
appRootCAs = [][]byte{}
ordererRootCAs = [][]byte{}
for _, appRootCA := range cas.AppRootCAsByChain {
appRootCAs = append(appRootCAs, appRootCA...)
}
for _, ordererRootCA := range cas.OrdererRootCAsByChain {
ordererRootCAs = append(ordererRootCAs, ordererRootCA...)
}
// also need to append statically configured root certs
appRootCAs = append(appRootCAs, cas.ServerRootCAs...)
return appRootCAs, ordererRootCAs
}
// GetClientRootCAs returns the PEM-encoded root certificates for all of the
// application and orderer organizations defined for all chains. The root
// certificates returned should be used to set the trusted client roots for
// TLS servers.
func (cas *CASupport) GetClientRootCAs() (appRootCAs, ordererRootCAs [][]byte) {
cas.RLock()
defer cas.RUnlock()
appRootCAs = [][]byte{}
ordererRootCAs = [][]byte{}
for _, appRootCA := range cas.AppRootCAsByChain {
appRootCAs = append(appRootCAs, appRootCA...)
}
for _, ordererRootCA := range cas.OrdererRootCAsByChain {
ordererRootCAs = append(ordererRootCAs, ordererRootCA...)
}
// also need to append statically configured root certs
appRootCAs = append(appRootCAs, cas.ClientRootCAs...)
return appRootCAs, ordererRootCAs
}
// GetDeliverServiceCredentials returns GRPC transport credentials for given channel to be used by GRPC
// clients which communicate with ordering service endpoints.
// If the channel isn't found, error is returned.
func (cs *CredentialSupport) GetDeliverServiceCredentials(channelID string) (credentials.TransportCredentials, error) {
cs.RLock()
defer cs.RUnlock()
var creds credentials.TransportCredentials
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cs.ClientCert},
}
certPool := x509.NewCertPool()
rootCACerts, exists := cs.OrdererRootCAsByChain[channelID]
if !exists {
commLogger.Errorf("Attempted to obtain root CA certs of a non existent channel: %s", channelID)
return nil, fmt.Errorf("didn't find any root CA certs for channel %s", channelID)
}
for _, cert := range rootCACerts {
block, _ := pem.Decode(cert)
if block != nil {
cert, err := x509.ParseCertificate(block.Bytes)
if err == nil {
certPool.AddCert(cert)
} else {
commLogger.Warningf("Failed to add root cert to credentials (%s)", err)
}
} else {
commLogger.Warning("Failed to add root cert to credentials")
}
}
tlsConfig.RootCAs = certPool
creds = credentials.NewTLS(tlsConfig)
return creds, nil
}
// GetPeerCredentials returns GRPC transport credentials for use by GRPC
// clients which communicate with remote peer endpoints.
func (cs *CredentialSupport) GetPeerCredentials() credentials.TransportCredentials {
var creds credentials.TransportCredentials
tlsConfig := &tls.Config{
Certificates: []tls.Certificate{cs.ClientCert},
}
certPool := x509.NewCertPool()
// loop through the server root CAs
roots, _ := cs.GetServerRootCAs()
for _, root := range roots {
err := AddPemToCertPool(root, certPool)
if err != nil {
commLogger.Warningf("Failed adding certificates to peer's client TLS trust pool: %s", err)
}
}
tlsConfig.RootCAs = certPool
creds = credentials.NewTLS(tlsConfig)
return creds
}
func getEnv(key, def string) string {
val := os.Getenv(key)
if len(val) > 0 {
return val
} else {
return def
}
}
func GetPeerTestingAddress(port string) string {
return getEnv("UNIT_TEST_PEER_IP", "localhost") + ":" + port
}
// NewClientConnectionWithAddress Returns a new grpc.ClientConn to the given address
func NewClientConnectionWithAddress(peerAddress string, block bool, tslEnabled bool, creds credentials.TransportCredentials) (*grpc.ClientConn, error) {
return newClientConnectionWithAddressWithKa(peerAddress, block, tslEnabled, creds, nil)
}
// NewChaincodeClientConnectionWithAddress Returns a new chaincode type grpc.ClientConn to the given address
func NewChaincodeClientConnectionWithAddress(peerAddress string, block bool, tslEnabled bool, creds credentials.TransportCredentials) (*grpc.ClientConn, error) {
ka := chaincodeKeepaliveOptions
//client side's keepalive parameter better be greater than EnforcementPolicies MinTime
//to prevent server killing the connection due to timing issues. Just increase by a min
ka.ClientKeepaliveTime += 60
return newClientConnectionWithAddressWithKa(peerAddress, block, tslEnabled, creds, &ka)
}
// newClientConnectionWithAddressWithKa Returns a new grpc.ClientConn to the given address using specied keepalive options
func newClientConnectionWithAddressWithKa(peerAddress string, block bool, tslEnabled bool, creds credentials.TransportCredentials, ka *KeepaliveOptions) (*grpc.ClientConn, error) {
var opts []grpc.DialOption
//preserve old behavior for non chaincode. We probably
//want to change this in future to have peer client
//send keepalives too
if ka != nil {
opts = clientKeepaliveOptionsWithKa(ka)
}
if tslEnabled {
opts = append(opts, grpc.WithTransportCredentials(creds))
} else {
opts = append(opts, grpc.WithInsecure())
}
if block {
opts = append(opts, grpc.WithBlock())
}
opts = append(opts, grpc.WithDefaultCallOptions(grpc.MaxCallRecvMsgSize(MaxRecvMsgSize()),
grpc.MaxCallSendMsgSize(MaxSendMsgSize())))
ctx := context.Background()
ctx, _ = context.WithTimeout(ctx, defaultTimeout)
conn, err := grpc.DialContext(ctx, peerAddress, opts...)
if err != nil {
return nil, err
}
return conn, err
}
// InitTLSForPeer returns TLS credentials for peer
func InitTLSForPeer() credentials.TransportCredentials {
var sn string
if viper.GetString("peer.tls.serverhostoverride") != "" {
sn = viper.GetString("peer.tls.serverhostoverride")
}
var creds credentials.TransportCredentials
if config.GetPath("peer.tls.rootcert.file") != "" {
var err error
creds, err = credentials.NewClientTLSFromFile(config.GetPath("peer.tls.rootcert.file"), sn)
if err != nil {
grpclog.Fatalf("Failed to create TLS credentials %v", err)
}
} else {
creds = credentials.NewClientTLSFromCert(nil, sn)
}
return creds
}
func InitTLSForShim(key, certStr string) credentials.TransportCredentials {
var sn string
if viper.GetString("peer.tls.serverhostoverride") != "" {
sn = viper.GetString("peer.tls.serverhostoverride")
}
priv, err := base64.StdEncoding.DecodeString(key)
if err != nil {
commLogger.Panicf("failed decoding private key from base64, string: %s, error: %v", key, err)
}
pub, err := base64.StdEncoding.DecodeString(certStr)
if err != nil {
commLogger.Panicf("failed decoding public key from base64, string: %s, error: %v", certStr, err)
}
cert, err := tls.X509KeyPair(pub, priv)
if err != nil {
commLogger.Panicf("failed loading certificate: %v", err)
}
b, err := ioutil.ReadFile(config.GetPath("peer.tls.rootcert.file"))
if err != nil {
commLogger.Panicf("failed loading root ca cert: %v", err)
}
cp := x509.NewCertPool()
if !cp.AppendCertsFromPEM(b) {
commLogger.Panicf("failed to append certificates")
}
return credentials.NewTLS(&tls.Config{
Certificates: []tls.Certificate{cert},
RootCAs: cp,
ServerName: sn,
})
}