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Implement group password for session auth

Browse Source 
This adds a new `GroupPassword` option to the configuration file. Only
nodes that share the same `GroupPassword` are able to exchange overlay
traffic with each other, allowing the formation of closed networks.

This does not affect peerings, nodes with different `GroupPassword` set
can still forward traffic for each other and act as routers in the wider
network.
This commit is contained in:
Neil Alexander
2026-06-01 13:59:08 +01:00
parent dd056e006c
commit cf40f20e31
7 changed files with 105 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files
cmd/yggdrasil/main.go
+3
View File
@@ -211,6 +211,9 @@ func main() {
for _, peer := range cfg.Peers {
options = append(options, core.Peer{URI: peer})
}
if cfg.GroupPassword != "" {
options = append(options, core.GroupPassword(cfg.GroupPassword))
}
for intf, peers := range cfg.InterfacePeers {
for _, peer := range peers {
options = append(options, core.Peer{URI: peer, SourceInterface: intf})
go.mod
+1 -1
View File
@@ -3,7 +3,7 @@ module github.com/yggdrasil-network/yggdrasil-go
go 1.24.0
require (
github.com/Arceliar/ironwood v0.0.0-20260117132459-7017dbc41d8e
github.com/Arceliar/ironwood v0.0.0-20260601001307-e1eeb5b910a4
github.com/Arceliar/phony v0.0.0-20220903101357-530938a4b13d
github.com/cheggaaa/pb/v3 v3.1.7
github.com/coder/websocket v1.8.14
go.sum
+2 -2
View File
@@ -1,5 +1,5 @@
github.com/Arceliar/ironwood v0.0.0-20260117132459-7017dbc41d8e h1:s7MuhcZu2hNfVvYLT4cKnQt7pZ1+z6eL2E48YlaAqzY=
github.com/Arceliar/ironwood v0.0.0-20260117132459-7017dbc41d8e/go.mod h1:SrrElc3FFMpYCODSr11jWbLFeOM8WsY+DbDY/l2AXF0=
github.com/Arceliar/ironwood v0.0.0-20260601001307-e1eeb5b910a4 h1:WD8VAn6IGTeo5BZ84Zpo4szFl6y9s941efvbcIQuooY=
github.com/Arceliar/ironwood v0.0.0-20260601001307-e1eeb5b910a4/go.mod h1:SrrElc3FFMpYCODSr11jWbLFeOM8WsY+DbDY/l2AXF0=
github.com/Arceliar/phony v0.0.0-20220903101357-530938a4b13d h1:UK9fsWbWqwIQkMCz1CP+v5pGbsGoWAw6g4AyvMpm1EM=
github.com/Arceliar/phony v0.0.0-20220903101357-530938a4b13d/go.mod h1:BCnxhRf47C/dy/e/D2pmB8NkB3dQVIrkD98b220rx5Q=
github.com/VividCortex/ewma v1.2.0 h1:f58SaIzcDXrSy3kWaHNvuJgJ3Nmz59Zji6XoJR/q1ow=
src/config/config.go
+2 -1
View File
@@ -48,7 +48,8 @@ type NodeConfig struct {
Listen []string `comment:"Listen addresses for incoming connections. You will need to add\nlisteners in order to accept incoming peerings from non-local nodes.\nThis is not required if you wish to establish outbound peerings only.\nMulticast peer discovery will work regardless of any listeners set\nhere. Each listener should be specified in URI format as above, e.g.\ntls://0.0.0.0:0 or tls://[::]:0 to listen on all interfaces."`
AdminListen string `json:",omitempty" comment:"Listen address for admin connections. Default is to listen for local\nconnections either on TCP/9001 or a UNIX socket depending on your\nplatform. Use this value for yggdrasilctl -endpoint=X. To disable\nthe admin socket, use the value \"none\" instead."`
MulticastInterfaces []MulticastInterfaceConfig `comment:"Configuration for which interfaces multicast peer discovery should be\nenabled on. Regex is a regular expression which is matched against an\ninterface name, and interfaces use the first configuration that they\nmatch against. Beacon controls whether or not your node advertises its\npresence to others, whereas Listen controls whether or not your node\nlistens out for and tries to connect to other advertising nodes. See\nhttps://yggdrasil-network.github.io/configurationref.html#multicastinterfaces\nfor more supported options."`
AllowedPublicKeys []string `comment:"List of peer public keys to allow incoming peering connections\nfrom. If left empty/undefined then all connections will be allowed\nby default. This does not affect outgoing peerings, nor does it\naffect link-local peers discovered via multicast.\nWARNING: THIS IS NOT A FIREWALL and DOES NOT limit who can reach\nopen ports or services running on your machine!"`
AllowedPublicKeys []string `comment:"List of peer public keys to allow incoming peering connections\nfrom. If left empty/undefined then all connections will be allowed\nby default. This does not affect outgoing peerings, nor does it\naffect link-local peers discovered via multicast.\nWARNING: THIS IS NOT A FIREWALL and DOES NOT limit who can reach\nopen ports or services running on your machine, for that see the\nGroupPassword option below."`
GroupPassword string `comment:"Traffic is only allowed to/from nodes with the same group password.\nIf you want to form a private sub-network or ensure that other public\nusers cannot connect to your machines, choose a strong group password\nand then configure the same password only with other group members.\nIf left empty or not specified, public connectivity will be permitted.\nIf specified, you WILL NOT be able to reach public services or hosts.\nThis option DOES NOT affect peering connections or traffic routing."`
IfName string `comment:"Local network interface name for TUN adapter, or \"auto\" to select\nan interface automatically, or \"none\" to run without TUN."`
IfMTU uint64 `comment:"Maximum Transmission Unit (MTU) size for your local TUN interface.\nDefault is the largest supported size for your platform. The lowest\npossible value is 1280."`
LogLookups bool `json:",omitempty"`
src/core/core.go
+3 -1
View File
@@ -42,6 +42,7 @@ type Core struct {
nodeinfo NodeInfo // immutable after startup
nodeinfoPrivacy NodeInfoPrivacy // immutable after startup
_allowedPublicKeys map[[32]byte]struct{} // configurable after startup
groupPassword string // immutable after startup
}
pathNotify func(ed25519.PublicKey)
}
@@ -94,8 +95,9 @@ func New(cert *tls.Certificate, logger Logger, opts ...SetupOption) (*Core, erro
keyXform := func(key ed25519.PublicKey) ed25519.PublicKey {
return address.SubnetForKey(key).GetKey()
}
if c.PacketConn, err = iwe.NewPacketConn(
if c.PacketConn, err = iwe.NewPacketConnWithPassword(
c.secret,
c.config.groupPassword,
iwn.WithBloomTransform(keyXform),
iwn.WithPeerMaxMessageSize(65535*2),
iwn.WithPathNotify(c.doPathNotify),
src/core/core_test.go
+90
View File
@@ -2,7 +2,10 @@ package core
import (
"bytes"
"crypto/ed25519"
"crypto/rand"
"encoding/hex"
"net"
"net/url"
"os"
"testing"
@@ -32,6 +35,13 @@ func require_NoError(t *testing.T, err error) {
}
}
func require_Error(t *testing.T, err error) {
t.Helper()
if err == nil {
t.Fatal("expected error")
}
}
func require_Equal[T comparable](t *testing.T, a, b T) {
t.Helper()
if a != b {
@@ -288,3 +298,83 @@ func TestAllowedPublicKeysLocal(t *testing.T) {
require_True(t, peers[0].Up)
require_True(t, peers[0].LastError == nil)
}
func TestGroupPassword(t *testing.T) {
logger := GetLoggerWithPrefix("", false)
cfgA, cfgB, cfgC := config.GenerateConfig(), config.GenerateConfig(), config.GenerateConfig()
require_NoError(t, cfgA.GenerateSelfSignedCertificate())
require_NoError(t, cfgB.GenerateSelfSignedCertificate())
require_NoError(t, cfgC.GenerateSelfSignedCertificate())
nodeA, err := New(cfgA.Certificate, logger, GroupPassword("test-group-password"))
require_NoError(t, err)
defer nodeA.Stop()
nodeB, err := New(cfgB.Certificate, logger, GroupPassword("test-group-password"))
require_NoError(t, err)
defer nodeB.Stop()
nodeC, err := New(cfgC.Certificate, logger, GroupPassword("different-test-group-password"))
require_NoError(t, err)
defer nodeC.Stop()
pathFound := map[string]chan struct{}{
nodeB.LocalAddr().String(): make(chan struct{}, 1),
nodeC.LocalAddr().String(): make(chan struct{}, 1),
}
nodeA.SetPathNotify(func(key ed25519.PublicKey) {
pathFound[hex.EncodeToString(key)] <- struct{}{}
})
u, err := url.Parse("tcp://localhost:0")
require_NoError(t, err)
l, err := nodeA.Listen(u, "")
require_NoError(t, err)
u, err = url.Parse("tcp://" + l.Addr().String())
require_NoError(t, err)
require_NoError(t, nodeB.AddPeer(u, ""))
require_NoError(t, nodeC.AddPeer(u, ""))
require_True(t, WaitConnected(nodeA, nodeB))
require_True(t, WaitConnected(nodeA, nodeC))
var connA net.PacketConn = nodeA.PacketConn
var connB net.PacketConn = nodeB.PacketConn
var connC net.PacketConn = nodeC.PacketConn
go func() {
var buf [1024]byte
for t.Context().Err() == nil {
// Needed as encrypted package relies on ReadFrom to process session acks.
_, _, _ = connA.ReadFrom(buf[:])
}
}()
matchingPasswordMessage := []byte("matching group password")
differentPasswordMessage := []byte("different group password")
_, err = connA.WriteTo(matchingPasswordMessage, connB.LocalAddr())
require_NoError(t, err)
_, err = connA.WriteTo(differentPasswordMessage, connC.LocalAddr())
require_NoError(t, err)
<-pathFound[nodeB.LocalAddr().String()]
<-pathFound[nodeC.LocalAddr().String()]
var buf [1024]byte
deadline := time.Now().Add(3 * time.Second)
require_NoError(t, connB.SetReadDeadline(deadline))
require_NoError(t, connC.SetReadDeadline(deadline))
n, from, err := connB.ReadFrom(buf[:])
require_NoError(t, err)
require_Equal(t, from.String(), connA.LocalAddr().String())
require_True(t, bytes.Equal(buf[:n], matchingPasswordMessage))
_, _, err = connC.ReadFrom(buf[:])
require_Error(t, err)
}
src/core/options.go
+4
View File
@@ -35,6 +35,8 @@ func (c *Core) _applyOption(opt SetupOption) (err error) {
pk := [32]byte{}
copy(pk[:], v)
c.config._allowedPublicKeys[pk] = struct{}{}
case GroupPassword:
c.config.groupPassword = string(v)
}
return
}
@@ -52,6 +54,7 @@ type NodeInfo map[string]interface{}
type NodeInfoPrivacy bool
type AllowedPublicKey ed25519.PublicKey
type PeerFilter func(net.IP) bool
type GroupPassword string
func (a ListenAddress) isSetupOption() {}
func (a Peer) isSetupOption() {}
@@ -59,3 +62,4 @@ func (a NodeInfo) isSetupOption() {}
func (a NodeInfoPrivacy) isSetupOption() {}
func (a AllowedPublicKey) isSetupOption() {}
func (a PeerFilter) isSetupOption() {}
func (a GroupPassword) isSetupOption() {}