Clarify XORMapped panic case (#877)

Read and check ip_forward from proc before write

.goreleaser.yaml

@@ -12,11 +12,7 @@ builds:
       - arm
       - amd64
       - arm64
-      - mips
       - 386
-    gomips:
-      - hardfloat
-      - softfloat
     ignore:
       - goos: windows
         goarch: arm64
@@ -30,6 +26,26 @@ builds:
     tags:
       - load_wgnt_from_rsrc
 
+  - id: netbird-static
+    dir: client
+    binary: netbird
+    env: [CGO_ENABLED=0]
+    goos:
+      - linux
+    goarch:
+      - mips
+      - mipsle
+      - mips64
+      - mips64le
+    gomips:
+      - hardfloat
+      - softfloat
+    ldflags:
+      - -s -w -X github.com/netbirdio/netbird/version.version={{.Version}} -X main.commit={{.Commit}} -X main.date={{.CommitDate}} -X main.builtBy=goreleaser
+    mod_timestamp: '{{ .CommitTimestamp }}'
+    tags:
+      - load_wgnt_from_rsrc
+
   - id: netbird-mgmt
     dir: management
     env:
@@ -67,6 +83,7 @@ builds:
 archives:
   - builds:
       - netbird
+      - netbird-static
 
 nfpms:
 

base62/base62.go

@@ -0,0 +1,59 @@
+package base62
+
+import (
+	"fmt"
+	"math"
+	"strings"
+)
+
+const (
+	alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+	base     = uint32(len(alphabet))
+)
+
+// Encode encodes a uint32 value to a base62 string.
+func Encode(num uint32) string {
+	if num == 0 {
+		return string(alphabet[0])
+	}
+
+	var encoded strings.Builder
+	remainder := uint32(0)
+
+	for num > 0 {
+		remainder = num % base
+		encoded.WriteByte(alphabet[remainder])
+		num /= base
+	}
+
+	// Reverse the encoded string
+	encodedString := encoded.String()
+	reversed := reverse(encodedString)
+	return reversed
+}
+
+// Decode decodes a base62 string to a uint32 value.
+func Decode(encoded string) (uint32, error) {
+	var decoded uint32
+	strLen := len(encoded)
+
+	for i, char := range encoded {
+		index := strings.IndexRune(alphabet, char)
+		if index < 0 {
+			return 0, fmt.Errorf("invalid character: %c", char)
+		}
+
+		decoded += uint32(index) * uint32(math.Pow(float64(base), float64(strLen-i-1)))
+	}
+
+	return decoded, nil
+}
+
+// Reverse a string.
+func reverse(s string) string {
+	runes := []rune(s)
+	for i, j := 0, len(runes)-1; i < j; i, j = i+1, j-1 {
+		runes[i], runes[j] = runes[j], runes[i]
+	}
+	return string(runes)
+}

base62/base62_test.go

@@ -0,0 +1,31 @@
+package base62
+
+import (
+	"testing"
+)
+
+func TestEncodeDecode(t *testing.T) {
+	tests := []struct {
+		num uint32
+	}{
+		{0},
+		{1},
+		{42},
+		{12345},
+		{99999},
+		{123456789},
+	}
+
+	for _, tt := range tests {
+		encoded := Encode(tt.num)
+		decoded, err := Decode(encoded)
+
+		if err != nil {
+			t.Errorf("Decode error: %v", err)
+		}
+
+		if decoded != tt.num {
+			t.Errorf("Decode(%v) = %v, want %v", encoded, decoded, tt.num)
+		}
+	}
+}

client/internal/dns/file_linux.go

@@ -32,6 +32,10 @@ func newFileConfigurator() (hostManager, error) {
 	return &fileConfigurator{}, nil
 }
 
+func (f *fileConfigurator) supportCustomPort() bool {
+	return false
+}
+
 func (f *fileConfigurator) applyDNSConfig(config hostDNSConfig) error {
 	backupFileExist := false
 	_, err := os.Stat(fileDefaultResolvConfBackupLocation)

client/internal/dns/host.go

@@ -10,6 +10,7 @@ import (
 type hostManager interface {
 	applyDNSConfig(config hostDNSConfig) error
 	restoreHostDNS() error
+	supportCustomPort() bool
 }
 
 type hostDNSConfig struct {
@@ -28,6 +29,7 @@ type domainConfig struct {
 type mockHostConfigurator struct {
 	applyDNSConfigFunc    func(config hostDNSConfig) error
 	restoreHostDNSFunc    func() error
+	supportCustomPortFunc func() bool
 }
 
 func (m *mockHostConfigurator) applyDNSConfig(config hostDNSConfig) error {
@@ -44,10 +46,18 @@ func (m *mockHostConfigurator) restoreHostDNS() error {
 	return fmt.Errorf("method restoreHostDNS is not implemented")
 }
 
+func (m *mockHostConfigurator) supportCustomPort() bool {
+	if m.supportCustomPortFunc != nil {
+		return m.supportCustomPortFunc()
+	}
+	return false
+}
+
 func newNoopHostMocker() hostManager {
 	return &mockHostConfigurator{
 		applyDNSConfigFunc:    func(config hostDNSConfig) error { return nil },
 		restoreHostDNSFunc:    func() error { return nil },
+		supportCustomPortFunc: func() bool { return true },
 	}
 }
 

client/internal/dns/host_darwin.go

@@ -8,8 +8,9 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/netbirdio/netbird/iface"
 	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/iface"
 )
 
 const (
@@ -39,6 +40,10 @@ func newHostManager(_ *iface.WGIface) (hostManager, error) {
 	}, nil
 }
 
+func (s *systemConfigurator) supportCustomPort() bool {
+	return true
+}
+
 func (s *systemConfigurator) applyDNSConfig(config hostDNSConfig) error {
 	var err error
 

client/internal/dns/host_windows.go

@@ -4,9 +4,10 @@ import (
 	"fmt"
 	"strings"
 
-	"github.com/netbirdio/netbird/iface"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/sys/windows/registry"
+
+	"github.com/netbirdio/netbird/iface"
 )
 
 const (
@@ -42,6 +43,10 @@ func newHostManager(wgInterface *iface.WGIface) (hostManager, error) {
 	}, nil
 }
 
+func (s *registryConfigurator) supportCustomPort() bool {
+	return false
+}
+
 func (r *registryConfigurator) applyDNSConfig(config hostDNSConfig) error {
 	var err error
 	if config.routeAll {

client/internal/dns/network_manager_linux.go

@@ -11,8 +11,9 @@ import (
 	"github.com/godbus/dbus/v5"
 	"github.com/hashicorp/go-version"
 	"github.com/miekg/dns"
-	"github.com/netbirdio/netbird/iface"
 	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/iface"
 )
 
 const (
@@ -88,6 +89,10 @@ func newNetworkManagerDbusConfigurator(wgInterface *iface.WGIface) (hostManager,
 	}, nil
 }
 
+func (n *networkManagerDbusConfigurator) supportCustomPort() bool {
+	return false
+}
+
 func (n *networkManagerDbusConfigurator) applyDNSConfig(config hostDNSConfig) error {
 	connSettings, configVersion, err := n.getAppliedConnectionSettings()
 	if err != nil {

client/internal/dns/resolvconf_linux.go

@@ -5,8 +5,9 @@ import (
 	"os/exec"
 	"strings"
 
-	"github.com/netbirdio/netbird/iface"
 	log "github.com/sirupsen/logrus"
+
+	"github.com/netbirdio/netbird/iface"
 )
 
 const resolvconfCommand = "resolvconf"
@@ -21,6 +22,10 @@ func newResolvConfConfigurator(wgInterface *iface.WGIface) (hostManager, error)
 	}, nil
 }
 
+func (r *resolvconf) supportCustomPort() bool {
+	return false
+}
+
 func (r *resolvconf) applyDNSConfig(config hostDNSConfig) error {
 	var err error
 	if !config.routeAll {

client/internal/dns/server_nonandroid.go

@@ -13,9 +13,10 @@ import (
 
 	"github.com/miekg/dns"
 	"github.com/mitchellh/hashstructure/v2"
+	log "github.com/sirupsen/logrus"
+
 	nbdns "github.com/netbirdio/netbird/dns"
 	"github.com/netbirdio/netbird/iface"
-	log "github.com/sirupsen/logrus"
 )
 
 const (
@@ -254,7 +255,14 @@ func (s *DefaultServer) applyConfiguration(update nbdns.Config) error {
 	s.updateLocalResolver(localRecords)
 	s.currentConfig = dnsConfigToHostDNSConfig(update, s.runtimeIP, s.runtimePort)
 
-	if err = s.hostManager.applyDNSConfig(s.currentConfig); err != nil {
+	hostUpdate := s.currentConfig
+	if s.runtimePort != defaultPort && !s.hostManager.supportCustomPort() {
+		log.Warnf("the DNS manager of this peer doesn't support custom port. Disabling primary DNS setup. " +
+			"Learn more at: https://netbird.io/docs/how-to-guides/nameservers#local-resolver")
+		hostUpdate.routeAll = false
+	}
+
+	if err = s.hostManager.applyDNSConfig(hostUpdate); err != nil {
 		log.Error(err)
 	}
 

client/internal/dns/systemd_linux.go

@@ -9,10 +9,11 @@ import (
 
 	"github.com/godbus/dbus/v5"
 	"github.com/miekg/dns"
-	nbdns "github.com/netbirdio/netbird/dns"
-	"github.com/netbirdio/netbird/iface"
 	log "github.com/sirupsen/logrus"
 	"golang.org/x/sys/unix"
+
+	nbdns "github.com/netbirdio/netbird/dns"
+	"github.com/netbirdio/netbird/iface"
 )
 
 const (
@@ -75,6 +76,10 @@ func newSystemdDbusConfigurator(wgInterface *iface.WGIface) (hostManager, error)
 	}, nil
 }
 
+func (s *systemdDbusConfigurator) supportCustomPort() bool {
+	return true
+}
+
 func (s *systemdDbusConfigurator) applyDNSConfig(config hostDNSConfig) error {
 	parsedIP, err := netip.ParseAddr(config.serverIP)
 	if err != nil {

client/internal/routemanager/systemops_linux.go

@@ -62,6 +62,16 @@ func removeFromRouteTable(prefix netip.Prefix) error {
 }
 
 func enableIPForwarding() error {
-	err := os.WriteFile(ipv4ForwardingPath, []byte("1"), 0644)
+	bytes, err := os.ReadFile(ipv4ForwardingPath)
+	if err != nil {
 		return err
 	}
+
+	// check if it is already enabled
+	// see more: https://github.com/netbirdio/netbird/issues/872
+	if len(bytes) > 0 && bytes[0] == 49 {
+		return nil
+	}
+
+	return os.WriteFile(ipv4ForwardingPath, []byte("1"), 0644)
+}

client/main.go

@@ -1,8 +1,9 @@
 package main
 
 import (
-	"github.com/netbirdio/netbird/client/cmd"
 	"os"
+
+	"github.com/netbirdio/netbird/client/cmd"
 )
 
 func main() {

go.mod

@@ -28,7 +28,6 @@ require (
 )
 
 require (
-	codeberg.org/ac/base62 v0.0.0-20210305150220-e793b546833a
 	fyne.io/fyne/v2 v2.1.4
 	github.com/c-robinson/iplib v1.0.3
 	github.com/coreos/go-iptables v0.6.0

go.sum

@@ -31,8 +31,6 @@ cloud.google.com/go/storage v1.5.0/go.mod h1:tpKbwo567HUNpVclU5sGELwQWBDZ8gh0Zeo
 cloud.google.com/go/storage v1.6.0/go.mod h1:N7U0C8pVQ/+NIKOBQyamJIeKQKkZ+mxpohlUTyfDhBk=
 cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RXyy7KQOVs=
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
-codeberg.org/ac/base62 v0.0.0-20210305150220-e793b546833a h1:U6cY/g6VSiy59vuvnBU6J/eSir0qVg4BeTnCDLaX+20=
-codeberg.org/ac/base62 v0.0.0-20210305150220-e793b546833a/go.mod h1:ykEpkLT4JtH3I4Rb4gwkDsNLfgUg803qRDeIX88t3e8=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 fyne.io/fyne/v2 v2.1.4 h1:bt1+28++kAzRzPB0GM2EuSV4cnl8rXNX4cjfd8G06Rc=
 fyne.io/fyne/v2 v2.1.4/go.mod h1:p+E/Dh+wPW8JwR2DVcsZ9iXgR9ZKde80+Y+40Is54AQ=

iface/bind/udp_mux_universal.go

@@ -209,7 +209,7 @@ func (m *UniversalUDPMuxDefault) GetXORMappedAddr(serverAddr net.Addr, deadline
 
 	// otherwise, make a STUN request to discover the address
 	// or wait for already sent request to complete
-	waitAddrReceived, err := m.sendStun(serverAddr)
+	waitAddrReceived, err := m.sendSTUN(serverAddr)
 	if err != nil {
 		return nil, fmt.Errorf("%s: %s", "failed to send STUN packet", err)
 	}
@@ -218,23 +218,31 @@ func (m *UniversalUDPMuxDefault) GetXORMappedAddr(serverAddr net.Addr, deadline
 	select {
 	case <-waitAddrReceived:
 		// when channel closed, addr was obtained
+		var addr *stun.XORMappedAddress
 		m.mu.Lock()
-		mappedAddr := *m.xorMappedMap[serverAddr.String()]
+		// A very odd case that mappedAddr is nil.
+		// Can happen when the deadline property is larger than params.XORMappedAddrCacheTTL.
+		// Or when we don't receive a response to our m.sendSTUN request (the response is handled asynchronously) and
+		// the XORMapped expires meanwhile triggering a closure of the waitAddrReceived channel.
+		// We protect the code from panic here.
+		if mappedAddr, ok := m.xorMappedMap[serverAddr.String()]; ok {
+			addr = mappedAddr.addr
+		}
 		m.mu.Unlock()
-		if mappedAddr.addr == nil {
+		if addr == nil {
 			return nil, fmt.Errorf("no XOR address mapping")
 		}
-		return mappedAddr.addr, nil
+		return addr, nil
 	case <-time.After(deadline):
 		return nil, fmt.Errorf("timeout while waiting for XORMappedAddr")
 	}
 }
 
-// sendStun sends a STUN request via UDP conn.
+// sendSTUN sends a STUN request via UDP conn.
 //
 // The returned channel is closed when the STUN response has been received.
 // Method is safe for concurrent use.
-func (m *UniversalUDPMuxDefault) sendStun(serverAddr net.Addr) (chan struct{}, error) {
+func (m *UniversalUDPMuxDefault) sendSTUN(serverAddr net.Addr) (chan struct{}, error) {
 	m.mu.Lock()
 	defer m.mu.Unlock()
 

management/server/account.go

@@ -15,13 +15,13 @@ import (
 	"sync"
 	"time"
 
-	"codeberg.org/ac/base62"
 	"github.com/eko/gocache/v3/cache"
 	cacheStore "github.com/eko/gocache/v3/store"
 	gocache "github.com/patrickmn/go-cache"
 	"github.com/rs/xid"
 	log "github.com/sirupsen/logrus"
 
+	"github.com/netbirdio/netbird/base62"
 	nbdns "github.com/netbirdio/netbird/dns"
 	"github.com/netbirdio/netbird/management/server/activity"
 	"github.com/netbirdio/netbird/management/server/idp"

management/server/idp/auth0.go

@@ -122,7 +122,7 @@ func NewAuth0Manager(oidcConfig OIDCConfig, config Auth0ClientConfig,
 	}
 
 	helper := JsonParser{}
-	config.AuthIssuer = oidcConfig.TokenEndpoint
+	config.AuthIssuer = oidcConfig.Issuer
 	config.GrantType = "client_credentials"
 
 	if config.ClientID == "" {

management/server/peer.go

@@ -28,6 +28,17 @@ type PeerSystemMeta struct {
 	UIVersion string
 }
 
+func (p PeerSystemMeta) isEqual(other PeerSystemMeta) bool {
+	return p.Hostname == other.Hostname &&
+		p.GoOS == other.GoOS &&
+		p.Kernel == other.Kernel &&
+		p.Core == other.Core &&
+		p.Platform == other.Platform &&
+		p.OS == other.OS &&
+		p.WtVersion == other.WtVersion &&
+		p.UIVersion == other.UIVersion
+}
+
 type PeerStatus struct {
 	// LastSeen is the last time peer was connected to the management service
 	LastSeen time.Time
@@ -114,13 +125,19 @@ func (p *Peer) Copy() *Peer {
 	}
 }
 
-// UpdateMeta updates peer's system meta data
+// UpdateMetaIfNew updates peer's system metadata if new information is provided
-func (p *Peer) UpdateMeta(meta PeerSystemMeta) {
+// returns true if meta was updated, false otherwise
+func (p *Peer) UpdateMetaIfNew(meta PeerSystemMeta) bool {
 	// Avoid overwriting UIVersion if the update was triggered sole by the CLI client
 	if meta.UIVersion == "" {
 		meta.UIVersion = p.Meta.UIVersion
 	}
+
+	if p.Meta.isEqual(meta) {
+		return false
+	}
 	p.Meta = meta
+	return true
 }
 
 // MarkLoginExpired marks peer's status expired or not
@@ -654,6 +671,8 @@ func (am *DefaultAccountManager) LoginPeer(login PeerLogin) (*Peer, *NetworkMap,
 		return nil, nil, err
 	}
 
+	// this flag prevents unnecessary calls to the persistent store.
+	shouldStoreAccount := false
 	updateRemotePeers := false
 	if peerLoginExpired(peer, account) {
 		err = checkAuth(login.UserID, peer)
@@ -664,19 +683,26 @@ func (am *DefaultAccountManager) LoginPeer(login PeerLogin) (*Peer, *NetworkMap,
 		// UserID is present, meaning that JWT validation passed successfully in the API layer.
 		updatePeerLastLogin(peer, account)
 		updateRemotePeers = true
+		shouldStoreAccount = true
 	}
 
-	peer = updatePeerMeta(peer, login.Meta, account)
+	peer, updated := updatePeerMeta(peer, login.Meta, account)
+	if updated {
+		shouldStoreAccount = true
+	}
 
 	peer, err = am.checkAndUpdatePeerSSHKey(peer, account, login.SSHKey)
 	if err != nil {
 		return nil, nil, err
 	}
 
+	if shouldStoreAccount {
 		err = am.Store.SaveAccount(account)
 		if err != nil {
 			return nil, nil, err
 		}
+	}
+
 	if updateRemotePeers {
 		err = am.updateAccountPeers(account)
 		if err != nil {
@@ -850,10 +876,12 @@ func (am *DefaultAccountManager) GetPeer(accountID, peerID, userID string) (*Pee
 	return nil, status.Errorf(status.Internal, "user %s has no access to peer %s under account %s", userID, peerID, accountID)
 }
 
-func updatePeerMeta(peer *Peer, meta PeerSystemMeta, account *Account) *Peer {
+func updatePeerMeta(peer *Peer, meta PeerSystemMeta, account *Account) (*Peer, bool) {
-	peer.UpdateMeta(meta)
+	if peer.UpdateMetaIfNew(meta) {
 		account.UpdatePeer(peer)
-	return peer
+		return peer, true
+	}
+	return peer, false
 }
 
 // GetPeerRules returns a list of source or destination rules of a given peer.

management/server/personal_access_token.go

@@ -7,9 +7,10 @@ import (
 	"hash/crc32"
 	"time"
 
-	"codeberg.org/ac/base62"
 	b "github.com/hashicorp/go-secure-stdlib/base62"
 	"github.com/rs/xid"
+
+	"github.com/netbirdio/netbird/base62"
 )
 
 const (

management/server/personal_access_token_test.go

@@ -4,11 +4,13 @@ import (
 	"crypto/sha256"
 	b64 "encoding/base64"
 	"hash/crc32"
+	"math/big"
 	"strings"
 	"testing"
 
-	"codeberg.org/ac/base62"
 	"github.com/stretchr/testify/assert"
+
+	"github.com/netbirdio/netbird/base62"
 )
 
 func TestPAT_GenerateToken_Hashing(t *testing.T) {
@@ -33,6 +35,8 @@ func TestPAT_GenerateToken_Checksum(t *testing.T) {
 	secret := tokenWithoutPrefix[:len(tokenWithoutPrefix)-6]
 	tokenCheckSum := tokenWithoutPrefix[len(tokenWithoutPrefix)-6:]
 
+	var i big.Int
+	i.SetString(secret, 62)
 	expectedChecksum := crc32.ChecksumIEEE([]byte(secret))
 	actualChecksum, err := base62.Decode(tokenCheckSum)
 	if err != nil {

management/server/user.go

@@ -565,6 +565,14 @@ func (am *DefaultAccountManager) SaveUser(accountID, initiatorUserID string, upd
 	}
 
 	defer func() {
+		if oldUser.IsBlocked() != update.IsBlocked() {
+			if update.IsBlocked() {
+				am.storeEvent(initiatorUserID, oldUser.Id, accountID, activity.UserBlocked, nil)
+			} else {
+				am.storeEvent(initiatorUserID, oldUser.Id, accountID, activity.UserUnblocked, nil)
+			}
+		}
+
 		// store activity logs
 		if oldUser.Role != newUser.Role {
 			am.storeEvent(initiatorUserID, oldUser.Id, accountID, activity.UserRoleUpdated, map[string]any{"role": newUser.Role})