p2p, p2p/discover, p2p/discv5: add IP network restriction feature
The p2p packages can now be configured to restrict all communication to a certain subset of IP networks. This feature is meant to be used for private networks.
This commit is contained in:
Felix Lange
parent
e46bda5093
commit
a47341cf96
45
p2p/dial.go
45
p2p/dial.go
@ -19,6 +19,7 @@ package p2p
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import (
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"container/heap"
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"crypto/rand"
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"errors"
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"fmt"
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"net"
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"time"
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@ -26,6 +27,7 @@ import (
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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)
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const (
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@ -48,6 +50,7 @@ const (
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type dialstate struct {
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maxDynDials int
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ntab discoverTable
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netrestrict *netutil.Netlist
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lookupRunning bool
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dialing map[discover.NodeID]connFlag
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@ -100,10 +103,11 @@ type waitExpireTask struct {
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time.Duration
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}
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func newDialState(static []*discover.Node, ntab discoverTable, maxdyn int) *dialstate {
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func newDialState(static []*discover.Node, ntab discoverTable, maxdyn int, netrestrict *netutil.Netlist) *dialstate {
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s := &dialstate{
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maxDynDials: maxdyn,
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ntab: ntab,
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netrestrict: netrestrict,
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static: make(map[discover.NodeID]*dialTask),
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dialing: make(map[discover.NodeID]connFlag),
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randomNodes: make([]*discover.Node, maxdyn/2),
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@ -128,12 +132,9 @@ func (s *dialstate) removeStatic(n *discover.Node) {
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func (s *dialstate) newTasks(nRunning int, peers map[discover.NodeID]*Peer, now time.Time) []task {
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var newtasks []task
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isDialing := func(id discover.NodeID) bool {
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_, found := s.dialing[id]
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return found || peers[id] != nil || s.hist.contains(id)
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}
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addDial := func(flag connFlag, n *discover.Node) bool {
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if isDialing(n.ID) {
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if err := s.checkDial(n, peers); err != nil {
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glog.V(logger.Debug).Infof("skipping dial candidate %x@%v:%d: %v", n.ID[:8], n.IP, n.TCP, err)
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return false
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}
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s.dialing[n.ID] = flag
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@ -159,7 +160,12 @@ func (s *dialstate) newTasks(nRunning int, peers map[discover.NodeID]*Peer, now
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// Create dials for static nodes if they are not connected.
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for id, t := range s.static {
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if !isDialing(id) {
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err := s.checkDial(t.dest, peers)
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switch err {
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case errNotWhitelisted, errSelf:
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glog.V(logger.Debug).Infof("removing static dial candidate %x@%v:%d: %v", t.dest.ID[:8], t.dest.IP, t.dest.TCP, err)
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delete(s.static, t.dest.ID)
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case nil:
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s.dialing[id] = t.flags
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newtasks = append(newtasks, t)
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}
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@ -202,6 +208,31 @@ func (s *dialstate) newTasks(nRunning int, peers map[discover.NodeID]*Peer, now
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return newtasks
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}
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var (
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errSelf = errors.New("is self")
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errAlreadyDialing = errors.New("already dialing")
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errAlreadyConnected = errors.New("already connected")
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errRecentlyDialed = errors.New("recently dialed")
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errNotWhitelisted = errors.New("not contained in netrestrict whitelist")
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)
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func (s *dialstate) checkDial(n *discover.Node, peers map[discover.NodeID]*Peer) error {
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_, dialing := s.dialing[n.ID]
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switch {
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case dialing:
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return errAlreadyDialing
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case peers[n.ID] != nil:
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return errAlreadyConnected
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case s.ntab != nil && n.ID == s.ntab.Self().ID:
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return errSelf
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case s.netrestrict != nil && !s.netrestrict.Contains(n.IP):
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return errNotWhitelisted
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case s.hist.contains(n.ID):
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return errRecentlyDialed
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}
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return nil
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}
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func (s *dialstate) taskDone(t task, now time.Time) {
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switch t := t.(type) {
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case *dialTask:
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@ -25,6 +25,7 @@ import (
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"github.com/davecgh/go-spew/spew"
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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)
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func init() {
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@ -86,7 +87,7 @@ func (t fakeTable) ReadRandomNodes(buf []*discover.Node) int { return copy(buf,
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// This test checks that dynamic dials are launched from discovery results.
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func TestDialStateDynDial(t *testing.T) {
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runDialTest(t, dialtest{
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init: newDialState(nil, fakeTable{}, 5),
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init: newDialState(nil, fakeTable{}, 5, nil),
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rounds: []round{
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// A discovery query is launched.
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{
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@ -233,7 +234,7 @@ func TestDialStateDynDialFromTable(t *testing.T) {
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}
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runDialTest(t, dialtest{
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init: newDialState(nil, table, 10),
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init: newDialState(nil, table, 10, nil),
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rounds: []round{
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// 5 out of 8 of the nodes returned by ReadRandomNodes are dialed.
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{
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@ -313,6 +314,36 @@ func TestDialStateDynDialFromTable(t *testing.T) {
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})
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}
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// This test checks that candidates that do not match the netrestrict list are not dialed.
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func TestDialStateNetRestrict(t *testing.T) {
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// This table always returns the same random nodes
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// in the order given below.
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table := fakeTable{
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{ID: uintID(1), IP: net.ParseIP("127.0.0.1")},
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{ID: uintID(2), IP: net.ParseIP("127.0.0.2")},
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{ID: uintID(3), IP: net.ParseIP("127.0.0.3")},
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{ID: uintID(4), IP: net.ParseIP("127.0.0.4")},
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{ID: uintID(5), IP: net.ParseIP("127.0.2.5")},
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{ID: uintID(6), IP: net.ParseIP("127.0.2.6")},
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{ID: uintID(7), IP: net.ParseIP("127.0.2.7")},
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{ID: uintID(8), IP: net.ParseIP("127.0.2.8")},
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}
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restrict := new(netutil.Netlist)
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restrict.Add("127.0.2.0/24")
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runDialTest(t, dialtest{
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init: newDialState(nil, table, 10, restrict),
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rounds: []round{
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{
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new: []task{
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&dialTask{flags: dynDialedConn, dest: table[4]},
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&discoverTask{},
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},
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},
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},
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})
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}
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// This test checks that static dials are launched.
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func TestDialStateStaticDial(t *testing.T) {
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wantStatic := []*discover.Node{
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@ -324,7 +355,7 @@ func TestDialStateStaticDial(t *testing.T) {
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}
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runDialTest(t, dialtest{
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init: newDialState(wantStatic, fakeTable{}, 0),
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init: newDialState(wantStatic, fakeTable{}, 0, nil),
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rounds: []round{
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// Static dials are launched for the nodes that
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// aren't yet connected.
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@ -405,7 +436,7 @@ func TestDialStateCache(t *testing.T) {
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}
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runDialTest(t, dialtest{
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init: newDialState(wantStatic, fakeTable{}, 0),
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init: newDialState(wantStatic, fakeTable{}, 0, nil),
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rounds: []round{
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// Static dials are launched for the nodes that
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// aren't yet connected.
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@ -467,7 +498,7 @@ func TestDialStateCache(t *testing.T) {
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func TestDialResolve(t *testing.T) {
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resolved := discover.NewNode(uintID(1), net.IP{127, 0, 55, 234}, 3333, 4444)
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table := &resolveMock{answer: resolved}
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state := newDialState(nil, table, 0)
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state := newDialState(nil, table, 0, nil)
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// Check that the task is generated with an incomplete ID.
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dest := discover.NewNode(uintID(1), nil, 0, 0)
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@ -127,13 +127,16 @@ func makeEndpoint(addr *net.UDPAddr, tcpPort uint16) rpcEndpoint {
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return rpcEndpoint{IP: ip, UDP: uint16(addr.Port), TCP: tcpPort}
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}
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func nodeFromRPC(sender *net.UDPAddr, rn rpcNode) (*Node, error) {
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func (t *udp) nodeFromRPC(sender *net.UDPAddr, rn rpcNode) (*Node, error) {
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if rn.UDP <= 1024 {
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return nil, errors.New("low port")
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}
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if err := netutil.CheckRelayIP(sender.IP, rn.IP); err != nil {
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return nil, err
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}
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if t.netrestrict != nil && !t.netrestrict.Contains(rn.IP) {
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return nil, errors.New("not contained in netrestrict whitelist")
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}
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n := NewNode(rn.ID, rn.IP, rn.UDP, rn.TCP)
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err := n.validateComplete()
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return n, err
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@ -157,6 +160,7 @@ type conn interface {
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// udp implements the RPC protocol.
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type udp struct {
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conn conn
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netrestrict *netutil.Netlist
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priv *ecdsa.PrivateKey
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ourEndpoint rpcEndpoint
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@ -207,7 +211,7 @@ type reply struct {
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}
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// ListenUDP returns a new table that listens for UDP packets on laddr.
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func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string) (*Table, error) {
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func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string, netrestrict *netutil.Netlist) (*Table, error) {
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addr, err := net.ResolveUDPAddr("udp", laddr)
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if err != nil {
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return nil, err
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@ -216,7 +220,7 @@ func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBP
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if err != nil {
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return nil, err
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}
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tab, _, err := newUDP(priv, conn, natm, nodeDBPath)
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tab, _, err := newUDP(priv, conn, natm, nodeDBPath, netrestrict)
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if err != nil {
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return nil, err
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}
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@ -224,13 +228,14 @@ func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBP
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return tab, nil
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}
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func newUDP(priv *ecdsa.PrivateKey, c conn, natm nat.Interface, nodeDBPath string) (*Table, *udp, error) {
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func newUDP(priv *ecdsa.PrivateKey, c conn, natm nat.Interface, nodeDBPath string, netrestrict *netutil.Netlist) (*Table, *udp, error) {
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udp := &udp{
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conn: c,
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priv: priv,
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closing: make(chan struct{}),
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gotreply: make(chan reply),
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addpending: make(chan *pending),
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conn: c,
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priv: priv,
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netrestrict: netrestrict,
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closing: make(chan struct{}),
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gotreply: make(chan reply),
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addpending: make(chan *pending),
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}
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realaddr := c.LocalAddr().(*net.UDPAddr)
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if natm != nil {
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@ -287,7 +292,7 @@ func (t *udp) findnode(toid NodeID, toaddr *net.UDPAddr, target NodeID) ([]*Node
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reply := r.(*neighbors)
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for _, rn := range reply.Nodes {
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nreceived++
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n, err := nodeFromRPC(toaddr, rn)
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n, err := t.nodeFromRPC(toaddr, rn)
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if err != nil {
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glog.V(logger.Detail).Infof("invalid neighbor node (%v) from %v: %v", rn.IP, toaddr, err)
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continue
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@ -70,7 +70,7 @@ func newUDPTest(t *testing.T) *udpTest {
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remotekey: newkey(),
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remoteaddr: &net.UDPAddr{IP: net.IP{10, 0, 1, 99}, Port: 30303},
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}
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test.table, test.udp, _ = newUDP(test.localkey, test.pipe, nil, "")
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test.table, test.udp, _ = newUDP(test.localkey, test.pipe, nil, "", nil)
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return test
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}
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@ -31,6 +31,7 @@ import (
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/ethereum/go-ethereum/p2p/nat"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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"github.com/ethereum/go-ethereum/rlp"
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)
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@ -63,8 +64,9 @@ func debugLog(s string) {
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// Network manages the table and all protocol interaction.
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type Network struct {
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db *nodeDB // database of known nodes
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conn transport
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db *nodeDB // database of known nodes
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conn transport
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netrestrict *netutil.Netlist
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closed chan struct{} // closed when loop is done
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closeReq chan struct{} // 'request to close'
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@ -133,7 +135,7 @@ type timeoutEvent struct {
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node *Node
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}
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func newNetwork(conn transport, ourPubkey ecdsa.PublicKey, natm nat.Interface, dbPath string) (*Network, error) {
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func newNetwork(conn transport, ourPubkey ecdsa.PublicKey, natm nat.Interface, dbPath string, netrestrict *netutil.Netlist) (*Network, error) {
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ourID := PubkeyID(&ourPubkey)
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var db *nodeDB
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@ -148,6 +150,7 @@ func newNetwork(conn transport, ourPubkey ecdsa.PublicKey, natm nat.Interface, d
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net := &Network{
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db: db,
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conn: conn,
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netrestrict: netrestrict,
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tab: tab,
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topictab: newTopicTable(db, tab.self),
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ticketStore: newTicketStore(),
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@ -696,6 +699,9 @@ func (net *Network) internNodeFromNeighbours(sender *net.UDPAddr, rn rpcNode) (n
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if n == nil {
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// We haven't seen this node before.
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n, err = nodeFromRPC(sender, rn)
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if net.netrestrict != nil && !net.netrestrict.Contains(n.IP) {
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return n, errors.New("not contained in netrestrict whitelist")
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}
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if err == nil {
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n.state = unknown
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net.nodes[n.ID] = n
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@ -28,7 +28,7 @@ import (
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func TestNetwork_Lookup(t *testing.T) {
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key, _ := crypto.GenerateKey()
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network, err := newNetwork(lookupTestnet, key.PublicKey, nil, "")
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network, err := newNetwork(lookupTestnet, key.PublicKey, nil, "", nil)
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if err != nil {
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t.Fatal(err)
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}
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@ -290,7 +290,7 @@ func (s *simulation) launchNode(log bool) *Network {
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addr := &net.UDPAddr{IP: ip, Port: 30303}
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transport := &simTransport{joinTime: time.Now(), sender: id, senderAddr: addr, sim: s, priv: key}
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net, err := newNetwork(transport, key.PublicKey, nil, "<no database>")
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net, err := newNetwork(transport, key.PublicKey, nil, "<no database>", nil)
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if err != nil {
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panic("cannot launch new node: " + err.Error())
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}
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@ -238,12 +238,12 @@ type udp struct {
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}
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// ListenUDP returns a new table that listens for UDP packets on laddr.
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func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string) (*Network, error) {
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func ListenUDP(priv *ecdsa.PrivateKey, laddr string, natm nat.Interface, nodeDBPath string, netrestrict *netutil.Netlist) (*Network, error) {
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transport, err := listenUDP(priv, laddr)
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if err != nil {
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return nil, err
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}
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net, err := newNetwork(transport, priv.PublicKey, natm, nodeDBPath)
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net, err := newNetwork(transport, priv.PublicKey, natm, nodeDBPath, netrestrict)
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if err != nil {
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return nil, err
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}
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@ -30,6 +30,7 @@ import (
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"github.com/ethereum/go-ethereum/p2p/discover"
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"github.com/ethereum/go-ethereum/p2p/discv5"
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"github.com/ethereum/go-ethereum/p2p/nat"
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"github.com/ethereum/go-ethereum/p2p/netutil"
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)
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const (
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@ -101,6 +102,11 @@ type Config struct {
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// allowed to connect, even above the peer limit.
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TrustedNodes []*discover.Node
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// Connectivity can be restricted to certain IP networks.
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// If this option is set to a non-nil value, only hosts which match one of the
|
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// IP networks contained in the list are considered.
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NetRestrict *netutil.Netlist
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// NodeDatabase is the path to the database containing the previously seen
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// live nodes in the network.
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NodeDatabase string
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@ -356,7 +362,7 @@ func (srv *Server) Start() (err error) {
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// node table
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if srv.Discovery {
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ntab, err := discover.ListenUDP(srv.PrivateKey, srv.ListenAddr, srv.NAT, srv.NodeDatabase)
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ntab, err := discover.ListenUDP(srv.PrivateKey, srv.ListenAddr, srv.NAT, srv.NodeDatabase, srv.NetRestrict)
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if err != nil {
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return err
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}
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@ -367,7 +373,7 @@ func (srv *Server) Start() (err error) {
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}
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if srv.DiscoveryV5 {
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ntab, err := discv5.ListenUDP(srv.PrivateKey, srv.DiscoveryV5Addr, srv.NAT, "") //srv.NodeDatabase)
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ntab, err := discv5.ListenUDP(srv.PrivateKey, srv.DiscoveryV5Addr, srv.NAT, "", srv.NetRestrict) //srv.NodeDatabase)
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if err != nil {
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return err
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}
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@ -381,7 +387,7 @@ func (srv *Server) Start() (err error) {
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if !srv.Discovery {
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dynPeers = 0
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}
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dialer := newDialState(srv.StaticNodes, srv.ntab, dynPeers)
|
||||
dialer := newDialState(srv.StaticNodes, srv.ntab, dynPeers, srv.NetRestrict)
|
||||
|
||||
// handshake
|
||||
srv.ourHandshake = &protoHandshake{Version: baseProtocolVersion, Name: srv.Name, ID: discover.PubkeyID(&srv.PrivateKey.PublicKey)}
|
||||
@ -634,8 +640,19 @@ func (srv *Server) listenLoop() {
|
||||
}
|
||||
break
|
||||
}
|
||||
|
||||
// Reject connections that do not match NetRestrict.
|
||||
if srv.NetRestrict != nil {
|
||||
if tcp, ok := fd.RemoteAddr().(*net.TCPAddr); ok && !srv.NetRestrict.Contains(tcp.IP) {
|
||||
glog.V(logger.Debug).Infof("Rejected conn %v because it is not whitelisted in NetRestrict", fd.RemoteAddr())
|
||||
fd.Close()
|
||||
slots <- struct{}{}
|
||||
continue
|
||||
}
|
||||
}
|
||||
|
||||
fd = newMeteredConn(fd, true)
|
||||
glog.V(logger.Debug).Infof("Accepted conn %v\n", fd.RemoteAddr())
|
||||
glog.V(logger.Debug).Infof("Accepted conn %v", fd.RemoteAddr())
|
||||
|
||||
// Spawn the handler. It will give the slot back when the connection
|
||||
// has been established.
|
||||
|
||||
Loading…
Reference in New Issue
Block a user