/
conngater.go
352 lines (280 loc) · 8.23 KB
/
conngater.go
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package conngater
import (
"context"
"net"
"sync"
"github.com/libp2p/go-libp2p-core/connmgr"
"github.com/libp2p/go-libp2p-core/control"
"github.com/libp2p/go-libp2p-core/network"
"github.com/libp2p/go-libp2p-core/peer"
ma "github.com/multiformats/go-multiaddr"
manet "github.com/multiformats/go-multiaddr/net"
"github.com/ipfs/go-datastore"
"github.com/ipfs/go-datastore/namespace"
"github.com/ipfs/go-datastore/query"
logging "github.com/ipfs/go-log/v2"
)
// BasicConnectionGater implements a connection gater that allows the application to perform
// access control on incoming and outgoing connections.
type BasicConnectionGater struct {
sync.RWMutex
blockedPeers map[peer.ID]struct{}
blockedAddrs map[string]struct{}
blockedSubnets map[string]*net.IPNet
ds datastore.Datastore
}
var log = logging.Logger("net/conngater")
const (
ns = "/libp2p/net/conngater"
keyPeer = "/peer/"
keyAddr = "/addr/"
keySubnet = "/subnet/"
)
// NewBasicConnectionGater creates a new connection gater.
// The ds argument is an (optional, can be nil) datastore to persist the connection gater
// filters.
func NewBasicConnectionGater(ds datastore.Datastore) (*BasicConnectionGater, error) {
cg := &BasicConnectionGater{
blockedPeers: make(map[peer.ID]struct{}),
blockedAddrs: make(map[string]struct{}),
blockedSubnets: make(map[string]*net.IPNet),
}
if ds != nil {
cg.ds = namespace.Wrap(ds, datastore.NewKey(ns))
err := cg.loadRules(context.Background())
if err != nil {
return nil, err
}
}
return cg, nil
}
func (cg *BasicConnectionGater) loadRules(ctx context.Context) error {
// load blocked peers
res, err := cg.ds.Query(ctx, query.Query{Prefix: keyPeer})
if err != nil {
log.Errorf("error querying datastore for blocked peers: %s", err)
return err
}
for r := range res.Next() {
if r.Error != nil {
log.Errorf("query result error: %s", r.Error)
return err
}
p := peer.ID(r.Entry.Value)
cg.blockedPeers[p] = struct{}{}
}
// load blocked addrs
res, err = cg.ds.Query(ctx, query.Query{Prefix: keyAddr})
if err != nil {
log.Errorf("error querying datastore for blocked addrs: %s", err)
return err
}
for r := range res.Next() {
if r.Error != nil {
log.Errorf("query result error: %s", r.Error)
return err
}
ip := net.IP(r.Entry.Value)
cg.blockedAddrs[ip.String()] = struct{}{}
}
// load blocked subnets
res, err = cg.ds.Query(ctx, query.Query{Prefix: keySubnet})
if err != nil {
log.Errorf("error querying datastore for blocked subnets: %s", err)
return err
}
for r := range res.Next() {
if r.Error != nil {
log.Errorf("query result error: %s", r.Error)
return err
}
ipnetStr := string(r.Entry.Value)
_, ipnet, err := net.ParseCIDR(ipnetStr)
if err != nil {
log.Errorf("error parsing CIDR subnet: %s", err)
return err
}
cg.blockedSubnets[ipnetStr] = ipnet
}
return nil
}
// BlockPeer adds a peer to the set of blocked peers.
// Note: active connections to the peer are not automatically closed.
func (cg *BasicConnectionGater) BlockPeer(p peer.ID) error {
if cg.ds != nil {
err := cg.ds.Put(context.Background(), datastore.NewKey(keyPeer+p.String()), []byte(p))
if err != nil {
log.Errorf("error writing blocked peer to datastore: %s", err)
return err
}
}
cg.Lock()
defer cg.Unlock()
cg.blockedPeers[p] = struct{}{}
return nil
}
// UnblockPeer removes a peer from the set of blocked peers
func (cg *BasicConnectionGater) UnblockPeer(p peer.ID) error {
if cg.ds != nil {
err := cg.ds.Delete(context.Background(), datastore.NewKey(keyPeer+p.String()))
if err != nil {
log.Errorf("error deleting blocked peer from datastore: %s", err)
return err
}
}
cg.Lock()
defer cg.Unlock()
delete(cg.blockedPeers, p)
return nil
}
// ListBlockedPeers return a list of blocked peers
func (cg *BasicConnectionGater) ListBlockedPeers() []peer.ID {
cg.RLock()
defer cg.RUnlock()
result := make([]peer.ID, 0, len(cg.blockedPeers))
for p := range cg.blockedPeers {
result = append(result, p)
}
return result
}
// BlockAddr adds an IP address to the set of blocked addresses.
// Note: active connections to the IP address are not automatically closed.
func (cg *BasicConnectionGater) BlockAddr(ip net.IP) error {
if cg.ds != nil {
err := cg.ds.Put(context.Background(), datastore.NewKey(keyAddr+ip.String()), []byte(ip))
if err != nil {
log.Errorf("error writing blocked addr to datastore: %s", err)
return err
}
}
cg.Lock()
defer cg.Unlock()
cg.blockedAddrs[ip.String()] = struct{}{}
return nil
}
// UnblockAddr removes an IP address from the set of blocked addresses
func (cg *BasicConnectionGater) UnblockAddr(ip net.IP) error {
if cg.ds != nil {
err := cg.ds.Delete(context.Background(), datastore.NewKey(keyAddr+ip.String()))
if err != nil {
log.Errorf("error deleting blocked addr from datastore: %s", err)
return err
}
}
cg.Lock()
defer cg.Unlock()
delete(cg.blockedAddrs, ip.String())
return nil
}
// ListBlockedAddrs return a list of blocked IP addresses
func (cg *BasicConnectionGater) ListBlockedAddrs() []net.IP {
cg.RLock()
defer cg.RUnlock()
result := make([]net.IP, 0, len(cg.blockedAddrs))
for ipStr := range cg.blockedAddrs {
ip := net.ParseIP(ipStr)
result = append(result, ip)
}
return result
}
// BlockSubnet adds an IP subnet to the set of blocked addresses.
// Note: active connections to the IP subnet are not automatically closed.
func (cg *BasicConnectionGater) BlockSubnet(ipnet *net.IPNet) error {
if cg.ds != nil {
err := cg.ds.Put(context.Background(), datastore.NewKey(keySubnet+ipnet.String()), []byte(ipnet.String()))
if err != nil {
log.Errorf("error writing blocked addr to datastore: %s", err)
return err
}
}
cg.Lock()
defer cg.Unlock()
cg.blockedSubnets[ipnet.String()] = ipnet
return nil
}
// UnblockSubnet removes an IP address from the set of blocked addresses
func (cg *BasicConnectionGater) UnblockSubnet(ipnet *net.IPNet) error {
if cg.ds != nil {
err := cg.ds.Delete(context.Background(), datastore.NewKey(keySubnet+ipnet.String()))
if err != nil {
log.Errorf("error deleting blocked subnet from datastore: %s", err)
return err
}
}
cg.Lock()
defer cg.Unlock()
delete(cg.blockedSubnets, ipnet.String())
return nil
}
// ListBlockedSubnets return a list of blocked IP subnets
func (cg *BasicConnectionGater) ListBlockedSubnets() []*net.IPNet {
cg.RLock()
defer cg.RUnlock()
result := make([]*net.IPNet, 0, len(cg.blockedSubnets))
for _, ipnet := range cg.blockedSubnets {
result = append(result, ipnet)
}
return result
}
// ConnectionGater interface
var _ connmgr.ConnectionGater = (*BasicConnectionGater)(nil)
func (cg *BasicConnectionGater) InterceptPeerDial(p peer.ID) (allow bool) {
cg.RLock()
defer cg.RUnlock()
_, block := cg.blockedPeers[p]
return !block
}
func (cg *BasicConnectionGater) InterceptAddrDial(p peer.ID, a ma.Multiaddr) (allow bool) {
// we have already filtered blocked peers in InterceptPeerDial, so we just check the IP
cg.RLock()
defer cg.RUnlock()
ip, err := manet.ToIP(a)
if err != nil {
log.Warnf("error converting multiaddr to IP addr: %s", err)
return true
}
_, block := cg.blockedAddrs[ip.String()]
if block {
return false
}
for _, ipnet := range cg.blockedSubnets {
if ipnet.Contains(ip) {
return false
}
}
return true
}
func (cg *BasicConnectionGater) InterceptAccept(cma network.ConnMultiaddrs) (allow bool) {
cg.RLock()
defer cg.RUnlock()
a := cma.RemoteMultiaddr()
ip, err := manet.ToIP(a)
if err != nil {
log.Warnf("error converting multiaddr to IP addr: %s", err)
return true
}
_, block := cg.blockedAddrs[ip.String()]
if block {
return false
}
for _, ipnet := range cg.blockedSubnets {
if ipnet.Contains(ip) {
return false
}
}
return true
}
func (cg *BasicConnectionGater) InterceptSecured(dir network.Direction, p peer.ID, cma network.ConnMultiaddrs) (allow bool) {
if dir == network.DirOutbound {
// we have already filtered those in InterceptPeerDial/InterceptAddrDial
return true
}
// we have already filtered addrs in InterceptAccept, so we just check the peer ID
cg.RLock()
defer cg.RUnlock()
_, block := cg.blockedPeers[p]
return !block
}
func (cg *BasicConnectionGater) InterceptUpgraded(network.Conn) (allow bool, reason control.DisconnectReason) {
return true, 0
}