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implemented more deep filtering with backoff

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crn4 2025-06-20 10:50:33 +02:00
parent 6d9cbd5831
commit facff826b0
3 changed files with 205 additions and 130 deletions
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1
management/server/account.go
View File

@ -1580,7 +1580,6 @@ func (am *DefaultAccountManager) OnPeerDisconnected(ctx context.Context, account
if err != nil {
log.WithContext(ctx).Warnf("failed marking peer as disconnected %s %v", peerPubKey, err)
}
am.loginFilter.removeLogin(peerPubKey)
return nil
}

140
management/server/loginfilter.go
View File

@ -2,6 +2,7 @@ package server
import (
"hash/fnv"
"math"
"sync"
"time"
@ -9,44 +10,44 @@ import (
)
const (
filterTimeout = 5 * time.Minute // Duration to secure the previous login information in the filter
reconnThreshold = 5 * time.Minute
blockDuration = 10 * time.Minute // Duration for which a peer is banned after exceeding the reconnection limit
baseBlockDuration = 10 * time.Minute // Duration for which a peer is banned after exceeding the reconnection limit
reconnLimitForBan = 30 // Number of reconnections within the reconnTreshold that triggers a ban
metaChangeLim = 3 // Number of reconnections with different metadata that triggers a ban of one peer
metaChangeLimit = 3 // Number of reconnections with different metadata that triggers a ban of one peer
)
type config struct {
filterTimeout time.Duration
reconnThreshold time.Duration
blockDuration time.Duration
baseBlockDuration time.Duration
reconnLimitForBan int
metaChangeLim int
metaChangeLimit int
}
func initCfg() *config {
return &config{
reconnThreshold: reconnThreshold,
baseBlockDuration: baseBlockDuration,
reconnLimitForBan: reconnLimitForBan,
metaChangeLimit: metaChangeLimit,
}
}
type loginFilter struct {
mu sync.RWMutex
cfg *config
logged map[string]metahash
logged map[string]*peerState
}
type metahash struct {
hash uint64
counter int
banned bool
firstLogin time.Time
lastSeen time.Time
}
func initCfg() *config {
return &config{
filterTimeout: filterTimeout,
reconnThreshold: reconnThreshold,
blockDuration: blockDuration,
reconnLimitForBan: reconnLimitForBan,
metaChangeLim: metaChangeLim,
}
type peerState struct {
currentHash uint64
sessionCounter int
sessionStart time.Time
lastSeen time.Time
isBanned bool
banLevel int
banExpiresAt time.Time
metaChangeCounter int
metaChangeWindowStart time.Time
}
func newLoginFilter() *loginFilter {
@ -55,55 +56,94 @@ func newLoginFilter() *loginFilter {
func newLoginFilterWithCfg(cfg *config) *loginFilter {
return &loginFilter{
logged: make(map[string]metahash),
logged: make(map[string]*peerState),
cfg: cfg,
}
}
func (l *loginFilter) addLogin(wgPubKey string, metaHash uint64) {
l.mu.Lock()
defer l.mu.Unlock()
mh, ok := l.logged[wgPubKey]
if !ok || mh.banned || (mh.hash != metaHash && mh.counter > l.cfg.metaChangeLim) {
mh = metahash{
hash: metaHash,
firstLogin: time.Now(),
}
}
mh.counter++
mh.hash = metaHash
mh.lastSeen = time.Now()
if mh.counter > l.cfg.reconnLimitForBan && mh.lastSeen.Sub(mh.firstLogin) < l.cfg.reconnThreshold {
mh.banned = true
}
l.logged[wgPubKey] = mh
}
func (l *loginFilter) allowLogin(wgPubKey string, metaHash uint64) bool {
l.mu.RLock()
defer l.mu.RUnlock()
mh, ok := l.logged[wgPubKey]
state, ok := l.logged[wgPubKey]
if !ok {
return true
}
if mh.banned && time.Since(mh.lastSeen) < l.cfg.blockDuration {
if state.isBanned && time.Now().Before(state.banExpiresAt) {
return false
}
if mh.hash != metaHash && time.Since(mh.lastSeen) < l.cfg.filterTimeout && mh.counter > l.cfg.metaChangeLim {
return false
if metaHash != state.currentHash {
if time.Now().Before(state.metaChangeWindowStart.Add(l.cfg.reconnThreshold)) && state.metaChangeCounter >= l.cfg.metaChangeLimit {
return false
}
}
return true
}
func (l *loginFilter) removeLogin(wgPubKey string) {
func (l *loginFilter) addLogin(wgPubKey string, metaHash uint64) {
l.mu.Lock()
defer l.mu.Unlock()
delete(l.logged, wgPubKey)
now := time.Now()
state, ok := l.logged[wgPubKey]
if !ok {
l.logged[wgPubKey] = &peerState{
currentHash: metaHash,
sessionCounter: 1,
sessionStart: now,
lastSeen: now,
metaChangeWindowStart: now,
metaChangeCounter: 1,
}
return
}
if state.isBanned && now.After(state.banExpiresAt) {
state.isBanned = false
}
if state.banLevel > 0 && now.Sub(state.lastSeen) > (2*l.cfg.baseBlockDuration) {
state.banLevel = 0
}
if metaHash != state.currentHash {
if now.After(state.metaChangeWindowStart.Add(l.cfg.reconnThreshold)) {
state.metaChangeWindowStart = now
state.metaChangeCounter = 1
} else {
state.metaChangeCounter++
}
state.currentHash = metaHash
state.sessionCounter = 1
state.sessionStart = now
state.lastSeen = now
return
}
state.sessionCounter++
if state.sessionCounter > l.cfg.reconnLimitForBan && now.Sub(state.sessionStart) < l.cfg.reconnThreshold {
state.isBanned = true
state.banLevel++
backoffFactor := math.Pow(2, float64(state.banLevel-1))
duration := time.Duration(float64(l.cfg.baseBlockDuration) * backoffFactor)
state.banExpiresAt = now.Add(duration)
state.sessionCounter = 0
state.sessionStart = now
}
state.lastSeen = now
}
func metaHash(meta nbpeer.PeerSystemMeta, pubip string) uint64 {
h := fnv.New64a()
if len(meta.NetworkAddresses) != 0 {
for _, na := range meta.NetworkAddresses {
h.Write([]byte(na.Mac))
}
}
h.Write([]byte(meta.WtVersion))
h.Write([]byte(meta.OSVersion))
h.Write([]byte(meta.KernelVersion))

194
management/server/loginfilter_test.go
View File

@ -2,6 +2,7 @@ package server
import (
"hash/fnv"
"math"
"strconv"
"strings"
"testing"
@ -12,13 +13,12 @@ import (
nbpeer "github.com/netbirdio/netbird/management/server/peer"
)
func testCfg() *config {
func testAdvancedCfg() *config {
return &config{
filterTimeout: 20 * time.Millisecond,
reconnThreshold: 50 * time.Millisecond,
blockDuration: 100 * time.Millisecond,
baseBlockDuration: 100 * time.Millisecond,
reconnLimitForBan: 3,
metaChangeLim: 1,
metaChangeLimit: 2,
}
}
@ -28,113 +28,131 @@ type LoginFilterTestSuite struct {
}
func (s *LoginFilterTestSuite) SetupTest() {
s.filter = newLoginFilterWithCfg(testCfg())
s.filter = newLoginFilterWithCfg(testAdvancedCfg())
}
func TestLoginFilterTestSuite(t *testing.T) {
suite.Run(t, new(LoginFilterTestSuite))
}
func (s *LoginFilterTestSuite) TestFirstLogin() {
func (s *LoginFilterTestSuite) TestFirstLoginIsAlwaysAllowed() {
pubKey := "PUB_KEY_A"
meta := uint64(4353457657645)
meta := uint64(1)
s.True(s.filter.allowLogin(pubKey, meta), "should allow a new peer")
s.True(s.filter.allowLogin(pubKey, meta))
s.filter.addLogin(pubKey, meta)
s.Require().Contains(s.filter.logged, pubKey)
s.Equal(1, s.filter.logged[pubKey].counter)
s.Equal(1, s.filter.logged[pubKey].sessionCounter)
}
func (s *LoginFilterTestSuite) TestFlappingPeerTriggersBan() {
func (s *LoginFilterTestSuite) TestFlappingSameHashTriggersBan() {
pubKey := "PUB_KEY_A"
meta := uint64(4353457657645)
meta := uint64(1)
limit := s.filter.cfg.reconnLimitForBan
for range limit {
for i := 0; i <= limit; i++ {
s.filter.addLogin(pubKey, meta)
}
s.True(s.filter.allowLogin(pubKey, meta), "should still allow login at the limit boundary")
s.filter.addLogin(pubKey, meta)
s.False(s.filter.allowLogin(pubKey, meta), "should deny login after exceeding the limit")
s.True(s.filter.logged[pubKey].banned, "peer should be marked as banned")
s.False(s.filter.allowLogin(pubKey, meta))
s.Require().Contains(s.filter.logged, pubKey)
s.True(s.filter.logged[pubKey].isBanned)
}
func (s *LoginFilterTestSuite) TestBannedPeerIsDenied() {
func (s *LoginFilterTestSuite) TestBanDurationIncreasesExponentially() {
pubKey := "PUB_KEY_A"
meta := uint64(4353457657645)
meta := uint64(1)
limit := s.filter.cfg.reconnLimitForBan
baseBan := s.filter.cfg.baseBlockDuration
s.filter.logged[pubKey] = metahash{
hash: meta,
banned: true,
lastSeen: time.Now(),
for i := 0; i <= limit; i++ {
s.filter.addLogin(pubKey, meta)
}
s.Require().Contains(s.filter.logged, pubKey)
s.True(s.filter.logged[pubKey].isBanned)
s.Equal(1, s.filter.logged[pubKey].banLevel)
firstBanDuration := s.filter.logged[pubKey].banExpiresAt.Sub(s.filter.logged[pubKey].lastSeen)
s.InDelta(baseBan, firstBanDuration, float64(time.Millisecond))
s.False(s.filter.allowLogin(pubKey, meta))
s.filter.logged[pubKey].banExpiresAt = time.Now().Add(-time.Second)
s.filter.logged[pubKey].isBanned = false
for i := 0; i <= limit; i++ {
s.filter.addLogin(pubKey, meta)
}
s.True(s.filter.logged[pubKey].isBanned)
s.Equal(2, s.filter.logged[pubKey].banLevel)
secondBanDuration := s.filter.logged[pubKey].banExpiresAt.Sub(s.filter.logged[pubKey].lastSeen)
expectedSecondDuration := time.Duration(float64(baseBan) * math.Pow(2, 1))
s.InDelta(expectedSecondDuration, secondBanDuration, float64(time.Millisecond))
}
func (s *LoginFilterTestSuite) TestPeerIsAllowedAfterBanExpires() {
pubKey := "PUB_KEY_A"
meta := uint64(4353457657645)
meta := uint64(1)
s.filter.logged[pubKey] = metahash{
hash: meta,
banned: true,
lastSeen: time.Now().Add(-(s.filter.cfg.blockDuration + time.Second)),
s.filter.logged[pubKey] = &peerState{
isBanned: true,
banExpiresAt: time.Now().Add(-(s.filter.cfg.baseBlockDuration + time.Second)),
}
s.True(s.filter.allowLogin(pubKey, meta), "should allow login after ban expires")
s.filter.addLogin(pubKey, meta)
s.Require().Contains(s.filter.logged, pubKey)
entry := s.filter.logged[pubKey]
s.False(entry.banned, "ban should be lifted on new login")
s.Equal(1, entry.counter, "counter should be reset")
}
func (s *LoginFilterTestSuite) TestDifferentHashIsBlockedWhenActive() {
pubKey := "PUB_KEY_A"
meta1 := uint64(23424223423)
meta2 := uint64(99878798987987)
for range s.filter.cfg.metaChangeLim {
s.filter.addLogin(pubKey, meta1)
}
s.filter.addLogin(pubKey, meta1)
s.False(s.filter.allowLogin(pubKey, meta2))
}
func (s *LoginFilterTestSuite) TestDifferentHashIsAllowedAfterTimeout() {
pubKey := "PUB_KEY_A"
meta1 := uint64(23424223423)
meta2 := uint64(99878798987987)
s.filter.addLogin(pubKey, meta1)
s.Require().Contains(s.filter.logged, pubKey)
entry := s.filter.logged[pubKey]
entry.lastSeen = time.Now().Add(-(s.filter.cfg.filterTimeout + time.Second))
s.filter.logged[pubKey] = entry
s.True(s.filter.allowLogin(pubKey, meta2))
}
func (s *LoginFilterTestSuite) TestRemovedPeerCanLogin() {
pubKey := "PUB_KEY_A"
meta := uint64(4353457657645)
s.filter.addLogin(pubKey, meta)
s.Require().Contains(s.filter.logged, pubKey)
s.filter.removeLogin(pubKey)
s.NotContains(s.filter.logged, pubKey)
s.True(s.filter.allowLogin(pubKey, meta))
s.filter.addLogin(pubKey, meta)
s.Require().Contains(s.filter.logged, pubKey)
s.False(s.filter.logged[pubKey].isBanned)
}
func (s *LoginFilterTestSuite) TestBanLevelResetsAfterGoodBehavior() {
pubKey := "PUB_KEY_A"
meta := uint64(1)
s.filter.logged[pubKey] = &peerState{
currentHash: meta,
banLevel: 3,
lastSeen: time.Now().Add(-3 * s.filter.cfg.baseBlockDuration),
}
s.filter.addLogin(pubKey, meta)
s.Require().Contains(s.filter.logged, pubKey)
s.Equal(0, s.filter.logged[pubKey].banLevel)
}
func (s *LoginFilterTestSuite) TestFlappingDifferentHashesTriggersBlock() {
pubKey := "PUB_KEY_A"
limit := s.filter.cfg.metaChangeLimit
for i := range limit {
s.filter.addLogin(pubKey, uint64(i+1))
}
s.Require().Contains(s.filter.logged, pubKey)
s.Equal(limit, s.filter.logged[pubKey].metaChangeCounter)
isAllowed := s.filter.allowLogin(pubKey, uint64(limit+1))
s.False(isAllowed, "should block new meta hash after limit is reached")
}
func (s *LoginFilterTestSuite) TestMetaChangeIsAllowedAfterWindowResets() {
pubKey := "PUB_KEY_A"
meta1 := uint64(1)
meta2 := uint64(2)
meta3 := uint64(3)
s.filter.addLogin(pubKey, meta1)
s.filter.addLogin(pubKey, meta2)
s.Require().Contains(s.filter.logged, pubKey)
s.Equal(s.filter.cfg.metaChangeLimit, s.filter.logged[pubKey].metaChangeCounter)
s.False(s.filter.allowLogin(pubKey, meta3), "should be blocked inside window")
s.filter.logged[pubKey].metaChangeWindowStart = time.Now().Add(-(s.filter.cfg.reconnThreshold + time.Second))
s.True(s.filter.allowLogin(pubKey, meta3), "should be allowed after window expires")
s.filter.addLogin(pubKey, meta3)
s.Equal(1, s.filter.logged[pubKey].metaChangeCounter, "meta change counter should reset")
}
func BenchmarkHashingMethods(b *testing.B) {
@ -182,6 +200,12 @@ func BenchmarkHashingMethods(b *testing.B) {
func fnvHashToString(meta nbpeer.PeerSystemMeta, pubip string) string {
h := fnv.New64a()
if len(meta.NetworkAddresses) != 0 {
for _, na := range meta.NetworkAddresses {
h.Write([]byte(na.Mac))
}
}
h.Write([]byte(meta.WtVersion))
h.Write([]byte(meta.OSVersion))
h.Write([]byte(meta.KernelVersion))
@ -193,8 +217,9 @@ func fnvHashToString(meta nbpeer.PeerSystemMeta, pubip string) string {
}
func builderString(meta nbpeer.PeerSystemMeta, pubip string) string {
mac := getMacAddress(meta.NetworkAddresses)
estimatedSize := len(meta.WtVersion) + len(meta.OSVersion) + len(meta.KernelVersion) + len(meta.Hostname) + len(meta.SystemSerialNumber) +
len(pubip) + 5
len(pubip) + len(mac) + 6
var b strings.Builder
b.Grow(estimatedSize)
@ -213,3 +238,14 @@ func builderString(meta nbpeer.PeerSystemMeta, pubip string) string {
return b.String()
}
func getMacAddress(nas []nbpeer.NetworkAddress) string {
if len(nas) == 0 {
return ""
}
macs := make([]string, 0, len(nas))
for _, na := range nas {
macs = append(macs, na.Mac)
}
return strings.Join(macs, "/")
}