Extend protocol and firewall manager to handle old management (#915)

* Extend protocol and firewall manager to handle old management

* Send correct empty firewall rules list when delete peer

* Add extra tests for firewall manager and uspfilter

* Work with inconsistent state

* Review note

* Update comment

client/firewall/iptables/manager_linux.go

@@ -236,11 +236,20 @@ func (m *Manager) filterRuleSpecs(
 	table string, ip net.IP, protocol string, sPort, dPort string,
 	direction fw.RuleDirection, action fw.Action, comment string,
 ) (specs []string) {
+	matchByIP := true
+	// don't use IP matching if IP is ip 0.0.0.0
+	if s := ip.String(); s == "0.0.0.0" || s == "::" {
+		matchByIP = false
+	}
 	switch direction {
 	case fw.RuleDirectionIN:
-		specs = append(specs, "-s", ip.String())
+		if matchByIP {
+			specs = append(specs, "-s", ip.String())
+		}
 	case fw.RuleDirectionOUT:
-		specs = append(specs, "-d", ip.String())
+		if matchByIP {
+			specs = append(specs, "-d", ip.String())
+		}
 	}
 	if protocol != "all" {
 		specs = append(specs, "-p", protocol)

client/firewall/nftables/manager_linux.go

@@ -139,38 +139,41 @@ func (m *Manager) AddFiltering(
 		})
 	}
 
-	// source address position
-	var adrLen, adrOffset uint32
-	if ip.To4() == nil {
-		adrLen = 16
-		adrOffset = 8
-	} else {
-		adrLen = 4
-		adrOffset = 12
+	// don't use IP matching if IP is ip 0.0.0.0
+	if s := ip.String(); s != "0.0.0.0" && s != "::" {
+		// source address position
+		var adrLen, adrOffset uint32
+		if ip.To4() == nil {
+			adrLen = 16
+			adrOffset = 8
+		} else {
+			adrLen = 4
+			adrOffset = 12
+		}
+
+		// change to destination address position if need
+		if direction == fw.RuleDirectionOUT {
+			adrOffset += adrLen
+		}
+
+		ipToAdd, _ := netip.AddrFromSlice(ip)
+		add := ipToAdd.Unmap()
+
+		expressions = append(expressions,
+			&expr.Payload{
+				DestRegister: 1,
+				Base:         expr.PayloadBaseNetworkHeader,
+				Offset:       adrOffset,
+				Len:          adrLen,
+			},
+			&expr.Cmp{
+				Op:       expr.CmpOpEq,
+				Register: 1,
+				Data:     add.AsSlice(),
+			},
+		)
 	}
 
-	// change to destination address position if need
-	if direction == fw.RuleDirectionOUT {
-		adrOffset += adrLen
-	}
-
-	ipToAdd, _ := netip.AddrFromSlice(ip)
-	add := ipToAdd.Unmap()
-
-	expressions = append(expressions,
-		&expr.Payload{
-			DestRegister: 1,
-			Base:         expr.PayloadBaseNetworkHeader,
-			Offset:       adrOffset,
-			Len:          adrLen,
-		},
-		&expr.Cmp{
-			Op:       expr.CmpOpEq,
-			Register: 1,
-			Data:     add.AsSlice(),
-		},
-	)
-
 	if sPort != nil && len(sPort.Values) != 0 {
 		expressions = append(expressions,
 			&expr.Payload{

client/firewall/uspfilter/rule.go

@@ -13,6 +13,7 @@ type Rule struct {
 	id         string
 	ip         net.IP
 	ipLayer    gopacket.LayerType
+	matchByIP  bool
 	protoLayer gopacket.LayerType
 	direction  fw.RuleDirection
 	sPort      uint16

client/firewall/uspfilter/uspfilter.go

@@ -87,6 +87,7 @@ func (m *Manager) AddFiltering(
 		id:        uuid.New().String(),
 		ip:        ip,
 		ipLayer:   layers.LayerTypeIPv6,
+		matchByIP: true,
 		direction: direction,
 		drop:      action == fw.ActionDrop,
 		comment:   comment,
@@ -96,6 +97,10 @@ func (m *Manager) AddFiltering(
 		r.ip = ipNormalized
 	}
 
+	if s := r.ip.String(); s == "0.0.0.0" || s == "::" {
+		r.matchByIP = false
+	}
+
 	if sPort != nil && len(sPort.Values) == 1 {
 		r.sPort = uint16(sPort.Values[0])
 	}
@@ -223,25 +228,27 @@ func (m *Manager) dropFilter(packetData []byte, rules []Rule, isIncomingPacket b
 
 	// check if IP address match by IP
 	for _, rule := range rules {
-		switch ipLayer {
-		case layers.LayerTypeIPv4:
-			if isIncomingPacket {
-				if !d.ip4.SrcIP.Equal(rule.ip) {
-					continue
+		if rule.matchByIP {
+			switch ipLayer {
+			case layers.LayerTypeIPv4:
+				if isIncomingPacket {
+					if !d.ip4.SrcIP.Equal(rule.ip) {
+						continue
+					}
+				} else {
+					if !d.ip4.DstIP.Equal(rule.ip) {
+						continue
+					}
 				}
-			} else {
-				if !d.ip4.DstIP.Equal(rule.ip) {
-					continue
-				}
-			}
-		case layers.LayerTypeIPv6:
-			if isIncomingPacket {
-				if !d.ip6.SrcIP.Equal(rule.ip) {
-					continue
-				}
-			} else {
-				if !d.ip6.DstIP.Equal(rule.ip) {
-					continue
+			case layers.LayerTypeIPv6:
+				if isIncomingPacket {
+					if !d.ip6.SrcIP.Equal(rule.ip) {
+						continue
+					}
+				} else {
+					if !d.ip6.DstIP.Equal(rule.ip) {
+						continue
+					}
 				}
 			}
 		}

client/firewall/uspfilter/uspfilter_test.go

@@ -6,6 +6,8 @@ import (
 	"testing"
 	"time"
 
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
 	"github.com/stretchr/testify/require"
 
 	fw "github.com/netbirdio/netbird/client/firewall"
@@ -171,6 +173,72 @@ func TestManagerReset(t *testing.T) {
 	}
 }
 
+func TestNotMatchByIP(t *testing.T) {
+	ifaceMock := &IFaceMock{
+		SetFilteringFunc: func(iface.PacketFilter) error { return nil },
+	}
+
+	m, err := Create(ifaceMock)
+	if err != nil {
+		t.Errorf("failed to create Manager: %v", err)
+		return
+	}
+	m.wgNetwork = &net.IPNet{
+		IP:   net.ParseIP("100.10.0.0"),
+		Mask: net.CIDRMask(16, 32),
+	}
+
+	ip := net.ParseIP("0.0.0.0")
+	proto := fw.ProtocolUDP
+	direction := fw.RuleDirectionOUT
+	action := fw.ActionAccept
+	comment := "Test rule"
+
+	_, err = m.AddFiltering(ip, proto, nil, nil, direction, action, comment)
+	if err != nil {
+		t.Errorf("failed to add filtering: %v", err)
+		return
+	}
+
+	ipv4 := &layers.IPv4{
+		TTL:      64,
+		Version:  4,
+		SrcIP:    net.ParseIP("100.10.0.1"),
+		DstIP:    net.ParseIP("100.10.0.100"),
+		Protocol: layers.IPProtocolUDP,
+	}
+	udp := &layers.UDP{
+		SrcPort: 51334,
+		DstPort: 53,
+	}
+
+	if err := udp.SetNetworkLayerForChecksum(ipv4); err != nil {
+		t.Errorf("failed to set network layer for checksum: %v", err)
+		return
+	}
+	payload := gopacket.Payload([]byte("test"))
+
+	buf := gopacket.NewSerializeBuffer()
+	opts := gopacket.SerializeOptions{
+		ComputeChecksums: true,
+		FixLengths:       true,
+	}
+	if err = gopacket.SerializeLayers(buf, opts, ipv4, udp, payload); err != nil {
+		t.Errorf("failed to serialize packet: %v", err)
+		return
+	}
+
+	if m.dropFilter(buf.Bytes(), m.outgoingRules, false) {
+		t.Errorf("expected packet to be accepted")
+		return
+	}
+
+	if err = m.Reset(); err != nil {
+		t.Errorf("failed to reset Manager: %v", err)
+		return
+	}
+}
+
 func TestUSPFilterCreatePerformance(t *testing.T) {
 	for _, testMax := range []int{10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000} {
 		t.Run(fmt.Sprintf("Testing %d rules", testMax), func(t *testing.T) {

client/internal/acl/manager.go

@@ -22,7 +22,7 @@ type iFaceMapper interface {
 
 // Manager is a ACL rules manager
 type Manager interface {
-	ApplyFiltering(rules []*mgmProto.FirewallRule)
+	ApplyFiltering(rules []*mgmProto.FirewallRule, allowByDefault bool)
 	Stop()
 }
 
@@ -34,7 +34,9 @@ type DefaultManager struct {
 }
 
 // ApplyFiltering firewall rules to the local firewall manager processed by ACL policy.
-func (d *DefaultManager) ApplyFiltering(rules []*mgmProto.FirewallRule) {
+//
+// If allowByDefault is ture it appends allow ALL traffic rules to input and output chains.
+func (d *DefaultManager) ApplyFiltering(rules []*mgmProto.FirewallRule, allowByDefault bool) {
 	d.mutex.Lock()
 	defer d.mutex.Unlock()
 
@@ -47,6 +49,22 @@ func (d *DefaultManager) ApplyFiltering(rules []*mgmProto.FirewallRule) {
 		applyFailed  bool
 		newRulePairs = make(map[string][]firewall.Rule)
 	)
+	if allowByDefault {
+		rules = append(rules,
+			&mgmProto.FirewallRule{
+				PeerIP:    "0.0.0.0",
+				Direction: mgmProto.FirewallRule_IN,
+				Action:    mgmProto.FirewallRule_ACCEPT,
+				Protocol:  mgmProto.FirewallRule_ALL,
+			},
+			&mgmProto.FirewallRule{
+				PeerIP:    "0.0.0.0",
+				Direction: mgmProto.FirewallRule_OUT,
+				Action:    mgmProto.FirewallRule_ACCEPT,
+				Protocol:  mgmProto.FirewallRule_ALL,
+			},
+		)
+	}
 	for _, r := range rules {
 		rules, err := d.protoRuleToFirewallRule(r)
 		if err != nil {

client/internal/acl/manager_test.go

@@ -1,7 +1,6 @@
 package acl
 
 import (
-	"runtime"
 	"testing"
 
 	"github.com/golang/mock/gomock"
@@ -11,12 +10,6 @@ import (
 )
 
 func TestDefaultManager(t *testing.T) {
-	// TODO: enable when other platform will be added
-	if runtime.GOOS != "linux" {
-		t.Skipf("ACL manager not supported in the: %s", runtime.GOOS)
-		return
-	}
-
 	fwRules := []*mgmProto.FirewallRule{
 		{
 			PeerIP:    "10.93.0.1",
@@ -38,8 +31,9 @@ func TestDefaultManager(t *testing.T) {
 	defer ctrl.Finish()
 
 	iface := mocks.NewMockIFaceMapper(ctrl)
-	iface.EXPECT().IsUserspaceBind().Return(false)
-	iface.EXPECT().Name().Return("lo")
+	iface.EXPECT().IsUserspaceBind().Return(true)
+	// iface.EXPECT().Name().Return("lo")
+	iface.EXPECT().SetFiltering(gomock.Any())
 
 	// we receive one rule from the management so for testing purposes ignore it
 	acl, err := Create(iface)
@@ -50,7 +44,7 @@ func TestDefaultManager(t *testing.T) {
 	defer acl.Stop()
 
 	t.Run("apply firewall rules", func(t *testing.T) {
-		acl.ApplyFiltering(fwRules)
+		acl.ApplyFiltering(fwRules, false)
 
 		if len(acl.rulesPairs) != 2 {
 			t.Errorf("firewall rules not applied: %v", acl.rulesPairs)
@@ -73,7 +67,7 @@ func TestDefaultManager(t *testing.T) {
 			existedRulesID[id] = struct{}{}
 		}
 
-		acl.ApplyFiltering(fwRules)
+		acl.ApplyFiltering(fwRules, false)
 
 		// we should have one old and one new rule in the existed rules
 		if len(acl.rulesPairs) != 2 {
@@ -89,4 +83,18 @@ func TestDefaultManager(t *testing.T) {
 			}
 		}
 	})
+
+	t.Run("handle default rules", func(t *testing.T) {
+		acl.ApplyFiltering(nil, false)
+		if len(acl.rulesPairs) != 0 {
+			t.Errorf("rules should be empty if default not allowed, got: %v rules", len(acl.rulesPairs))
+			return
+		}
+
+		acl.ApplyFiltering(nil, true)
+		if len(acl.rulesPairs) != 2 {
+			t.Errorf("two default rules should be set if default is allowed, got: %v rules", len(acl.rulesPairs))
+			return
+		}
+	})
 }

client/internal/engine.go

@@ -637,7 +637,13 @@ func (e *Engine) updateNetworkMap(networkMap *mgmProto.NetworkMap) error {
 	}
 
 	if e.acl != nil {
-		e.acl.ApplyFiltering(networkMap.FirewallRules)
+		// if we got empty rules list but management not set networkMap.FirewallRulesIsEmpty flag
+		// we have old version of management without rules handling, we should allow all traffic
+		allowByDefault := len(networkMap.FirewallRules) == 0 && !networkMap.FirewallRulesIsEmpty
+		if allowByDefault {
+			log.Warn("this peer is connected to a NetBird Management service with an older version. Allowing all traffic from connected peers")
+		}
+		e.acl.ApplyFiltering(networkMap.FirewallRules, allowByDefault)
 	}
 	e.networkSerial = serial
 	return nil

management/proto/management.pb.go

@@ -1144,6 +1144,8 @@ type NetworkMap struct {
 	OfflinePeers []*RemotePeerConfig `protobuf:"bytes,7,rep,name=offlinePeers,proto3" json:"offlinePeers,omitempty"`
 	// FirewallRule represents a list of firewall rules to be applied to peer
 	FirewallRules []*FirewallRule `protobuf:"bytes,8,rep,name=FirewallRules,proto3" json:"FirewallRules,omitempty"`
+	// firewallRulesIsEmpty indicates whether FirewallRule array is empty or not to bypass protobuf null and empty array equality.
+	FirewallRulesIsEmpty bool `protobuf:"varint,9,opt,name=firewallRulesIsEmpty,proto3" json:"firewallRulesIsEmpty,omitempty"`
 }
 
 func (x *NetworkMap) Reset() {
@@ -1234,6 +1236,13 @@ func (x *NetworkMap) GetFirewallRules() []*FirewallRule {
 	return nil
 }
 
+func (x *NetworkMap) GetFirewallRulesIsEmpty() bool {
+	if x != nil {
+		return x.FirewallRulesIsEmpty
+	}
+	return false
+}
+
 // RemotePeerConfig represents a configuration of a remote peer.
 // The properties are used to configure WireGuard Peers sections
 type RemotePeerConfig struct {
@@ -2202,7 +2211,7 @@ var file_management_proto_rawDesc = []byte{
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@@ -2229,149 +2238,153 @@ var file_management_proto_rawDesc = []byte{
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+	0x6f, 0x33,
 }
 
 var (

management/proto/management.proto

@@ -189,6 +189,9 @@ message NetworkMap {
 
   // FirewallRule represents a list of firewall rules to be applied to peer
   repeated FirewallRule FirewallRules = 8;
+
+  // firewallRulesIsEmpty indicates whether FirewallRule array is empty or not to bypass protobuf null and empty array equality.
+  bool firewallRulesIsEmpty = 9;
 }
 
 // RemotePeerConfig represents a configuration of a remote peer.

management/server/grpcserver.go

@@ -444,14 +444,15 @@ func toSyncResponse(config *Config, peer *Peer, turnCredentials *TURNCredentials
 		RemotePeers:        remotePeers,
 		RemotePeersIsEmpty: len(remotePeers) == 0,
 		NetworkMap: &proto.NetworkMap{
-			Serial:             networkMap.Network.CurrentSerial(),
-			PeerConfig:         pConfig,
-			RemotePeers:        remotePeers,
-			OfflinePeers:       offlinePeers,
-			RemotePeersIsEmpty: len(remotePeers) == 0,
-			Routes:             routesUpdate,
-			DNSConfig:          dnsUpdate,
-			FirewallRules:      firewallRules,
+			Serial:               networkMap.Network.CurrentSerial(),
+			PeerConfig:           pConfig,
+			RemotePeers:          remotePeers,
+			OfflinePeers:         offlinePeers,
+			RemotePeersIsEmpty:   len(remotePeers) == 0,
+			Routes:               routesUpdate,
+			DNSConfig:            dnsUpdate,
+			FirewallRules:        firewallRules,
+			FirewallRulesIsEmpty: len(firewallRules) == 0,
 		},
 	}
 }

management/server/peer.go

@@ -395,9 +395,11 @@ func (am *DefaultAccountManager) DeletePeer(accountID, peerID, userID string) (*
 				RemotePeersIsEmpty: true,
 				// new field
 				NetworkMap: &proto.NetworkMap{
-					Serial:             account.Network.CurrentSerial(),
-					RemotePeers:        []*proto.RemotePeerConfig{},
-					RemotePeersIsEmpty: true,
+					Serial:               account.Network.CurrentSerial(),
+					RemotePeers:          []*proto.RemotePeerConfig{},
+					RemotePeersIsEmpty:   true,
+					FirewallRules:        []*proto.FirewallRule{},
+					FirewallRulesIsEmpty: true,
 				},
 			},
 		})

management/server/policy.go

@@ -242,6 +242,9 @@ func (a *Account) connResourcesGenerator() (func(*PolicyRule, []*Peer, int), fun
 	peers := make([]*Peer, 0)
 	return func(rule *PolicyRule, groupPeers []*Peer, direction int) {
 			for _, peer := range groupPeers {
+				if peer == nil {
+					continue
+				}
 				if _, ok := peersExists[peer.ID]; !ok {
 					peers = append(peers, peer)
 					peersExists[peer.ID] = struct{}{}
@@ -457,8 +460,8 @@ func getAllPeersFromGroups(account *Account, groups []string, peerID string) ([]
 		}
 
 		for _, p := range group.Peers {
-			peer := account.Peers[p]
-			if peer.ID == peerID {
+			peer, ok := account.Peers[p]
+			if ok && peer != nil && peer.ID == peerID {
 				peerInGroups = true
 				continue
 			}