From 293499c3c0678aadf3b46f5a19fe1dcdd6bed65e Mon Sep 17 00:00:00 2001 From: Givi Khojanashvili Date: Wed, 31 May 2023 21:04:38 +0400 Subject: [PATCH] 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 | 13 +- client/firewall/nftables/manager_linux.go | 63 +++-- client/firewall/uspfilter/rule.go | 1 + client/firewall/uspfilter/uspfilter.go | 43 +-- client/firewall/uspfilter/uspfilter_test.go | 68 +++++ client/internal/acl/manager.go | 22 +- client/internal/acl/manager_test.go | 30 +- client/internal/engine.go | 8 +- management/proto/management.pb.go | 299 ++++++++++---------- management/proto/management.proto | 3 + management/server/grpcserver.go | 17 +- management/server/peer.go | 8 +- management/server/policy.go | 7 +- 13 files changed, 362 insertions(+), 220 deletions(-) diff --git a/client/firewall/iptables/manager_linux.go b/client/firewall/iptables/manager_linux.go index c66c27195..6eec75c64 100644 --- a/client/firewall/iptables/manager_linux.go +++ b/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) diff --git a/client/firewall/nftables/manager_linux.go b/client/firewall/nftables/manager_linux.go index 4919d8150..7b30cfcd1 100644 --- a/client/firewall/nftables/manager_linux.go +++ b/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{ diff --git a/client/firewall/uspfilter/rule.go b/client/firewall/uspfilter/rule.go index 437d0d8ff..ba1a2f3ce 100644 --- a/client/firewall/uspfilter/rule.go +++ b/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 diff --git a/client/firewall/uspfilter/uspfilter.go b/client/firewall/uspfilter/uspfilter.go index 216c6577b..5ff5634f0 100644 --- a/client/firewall/uspfilter/uspfilter.go +++ b/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 + } } } } diff --git a/client/firewall/uspfilter/uspfilter_test.go b/client/firewall/uspfilter/uspfilter_test.go index 1e9bda68c..4dc5cfddd 100644 --- a/client/firewall/uspfilter/uspfilter_test.go +++ b/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) { diff --git a/client/internal/acl/manager.go b/client/internal/acl/manager.go index 5d5b21269..d0abdc920 100644 --- a/client/internal/acl/manager.go +++ b/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 { diff --git a/client/internal/acl/manager_test.go b/client/internal/acl/manager_test.go index 5aa7f5a36..fa8d922ac 100644 --- a/client/internal/acl/manager_test.go +++ b/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 + } + }) } diff --git a/client/internal/engine.go b/client/internal/engine.go index e0e067dd2..79f22de70 100644 --- a/client/internal/engine.go +++ b/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 diff --git a/management/proto/management.pb.go b/management/proto/management.pb.go index 59b753999..250e3db05 100644 --- a/management/proto/management.pb.go +++ b/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{ 0x28, 0x0b, 0x32, 0x15, 0x2e, 0x6d, 0x61, 0x6e, 0x61, 0x67, 0x65, 0x6d, 0x65, 0x6e, 0x74, 0x2e, 0x53, 0x53, 0x48, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x09, 0x73, 0x73, 0x68, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x12, 0x0a, 0x04, 0x66, 0x71, 0x64, 0x6e, 0x18, 0x04, 0x20, 0x01, - 0x28, 0x09, 0x52, 0x04, 0x66, 0x71, 0x64, 0x6e, 0x22, 0xae, 0x03, 0x0a, 0x0a, 0x4e, 0x65, 0x74, + 0x28, 0x09, 0x52, 0x04, 0x66, 0x71, 0x64, 0x6e, 0x22, 0xe2, 0x03, 0x0a, 0x0a, 0x4e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x4d, 0x61, 0x70, 0x12, 0x16, 0x0a, 0x06, 0x53, 0x65, 0x72, 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+++ b/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. diff --git a/management/server/grpcserver.go b/management/server/grpcserver.go index b1a717502..a2a0caf5a 100644 --- a/management/server/grpcserver.go +++ b/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, }, } } diff --git a/management/server/peer.go b/management/server/peer.go index 0584d27ca..f392b860f 100644 --- a/management/server/peer.go +++ b/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, }, }, }) diff --git a/management/server/policy.go b/management/server/policy.go index 3979b88b0..eb26c8202 100644 --- a/management/server/policy.go +++ b/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 }