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nebula/firewall_test.go
T
Matt RichardsonandClaude Fable 5.1 1e5ad19f6d Drop a packet claiming an overlay address through a peer's unsafe network 
The firewall accepted any inbound source inside the sender's unsafe
networks. One that overlapped the overlay let the peer send as any node
in it, and whatever trusted the source address, the firewall's own rules
and anything on the host reading it, was told the wrong node.

- a source inside this node's own networks is a node's address, which
  only that node sends from; through an unsafe network it is refused,
  counted as a dropped remote address
- the peer's own address and sources outside the overlay still pass
  through its unsafe network, and outbound, where the address is a
  destination, nothing changes

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
2026-10-21 12:28:39 -04:00

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package nebula
import (
"bytes"
"errors"
"log/slog"
"math"
"net/netip"
"testing"
"time"
"github.com/gaissmai/bart"
"github.com/slackhq/nebula/cert"
"github.com/slackhq/nebula/config"
"github.com/slackhq/nebula/firewall"
"github.com/slackhq/nebula/iputil"
"github.com/slackhq/nebula/test"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
)
func TestNewFirewall(t *testing.T) {
l := test.NewLogger()
c := &dummyCert{}
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c)
conntrack := fw.Conntrack
assert.NotNil(t, conntrack)
assert.NotNil(t, conntrack.Conns)
assert.NotNil(t, conntrack.TimerWheel)
assert.NotNil(t, fw.InRules)
assert.NotNil(t, fw.OutRules)
assert.Equal(t, time.Second, fw.TCPTimeout)
assert.Equal(t, time.Minute, fw.UDPTimeout)
assert.Equal(t, time.Hour, fw.DefaultTimeout)
assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
fw = NewFirewall(l, time.Second, time.Hour, time.Minute, c)
assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
fw = NewFirewall(l, time.Hour, time.Second, time.Minute, c)
assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
fw = NewFirewall(l, time.Hour, time.Minute, time.Second, c)
assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
fw = NewFirewall(l, time.Minute, time.Hour, time.Second, c)
assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
fw = NewFirewall(l, time.Minute, time.Second, time.Hour, c)
assert.Equal(t, time.Hour, conntrack.TimerWheel.wheelDuration)
assert.Equal(t, 3602, conntrack.TimerWheel.wheelLen)
}
func TestNewFirewall_ZeroOrNegativeTimeout(t *testing.T) {
l := test.NewLogger()
c := &dummyCert{}
cs := &CertState{v2Cert: c, initiatingVersion: cert.Version2}
cases := map[string]string{
"tcp_timeout zero": "firewall:\n conntrack:\n tcp_timeout: 0s\n",
"tcp_timeout negative": "firewall:\n conntrack:\n tcp_timeout: -5s\n",
"udp_timeout zero": "firewall:\n conntrack:\n udp_timeout: 0s\n",
"udp_timeout negative": "firewall:\n conntrack:\n udp_timeout: -5s\n",
"default_timeout zero": "firewall:\n conntrack:\n default_timeout: 0s\n",
"default_timeout negative": "firewall:\n conntrack:\n default_timeout: -5s\n",
}
for name, cfgStr := range cases {
t.Run(name, func(t *testing.T) {
cfg := config.NewC(l)
require.NoError(t, cfg.LoadString(cfgStr))
_, err := NewFirewallFromConfig(l, cs, cfg)
require.Error(t, err, "expected error for non-positive timeout duration")
assert.ErrorContains(t, err, "must be greater than 0")
})
}
}
func TestFirewall_AddRule(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
c := &dummyCert{}
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c)
assert.NotNil(t, fw.InRules)
assert.NotNil(t, fw.OutRules)
ti, err := netip.ParsePrefix("1.2.3.4/32")
require.NoError(t, err)
ti6, err := netip.ParsePrefix("fd12::34/128")
require.NoError(t, err)
require.NoError(t, fw.AddRule(true, iputil.IPProtocolTCP, 1, 1, []string{}, "", "", "", "", ""))
// An empty rule is any
assert.True(t, fw.InRules.TCP[1].Any.Any.Any)
assert.Empty(t, fw.InRules.TCP[1].Any.Groups)
assert.Empty(t, fw.InRules.TCP[1].Any.Hosts)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(true, iputil.IPProtocolUDP, 1, 1, []string{"g1"}, "", "", "", "", ""))
assert.Nil(t, fw.InRules.UDP[1].Any.Any)
assert.Contains(t, fw.InRules.UDP[1].Any.Groups[0].Groups, "g1")
assert.Empty(t, fw.InRules.UDP[1].Any.Hosts)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(true, iputil.IPProtocolICMP, 1, 1, []string{}, "h1", "", "", "", ""))
//no matter what port is given for icmp, it should end up as "any"
assert.Nil(t, fw.InRules.ICMP[firewall.PortAny].Any.Any)
assert.Empty(t, fw.InRules.ICMP[firewall.PortAny].Any.Groups)
assert.Contains(t, fw.InRules.ICMP[firewall.PortAny].Any.Hosts, "h1")
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 1, 1, []string{}, "", ti.String(), "", "", ""))
assert.Nil(t, fw.OutRules.AnyProto[1].Any.Any)
_, ok := fw.OutRules.AnyProto[1].Any.CIDR.Get(ti)
assert.True(t, ok)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 1, 1, []string{}, "", ti6.String(), "", "", ""))
assert.Nil(t, fw.OutRules.AnyProto[1].Any.Any)
_, ok = fw.OutRules.AnyProto[1].Any.CIDR.Get(ti6)
assert.True(t, ok)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 1, 1, []string{}, "", "", ti.String(), "", ""))
assert.NotNil(t, fw.OutRules.AnyProto[1].Any.Any)
ok = fw.OutRules.AnyProto[1].Any.Any.LocalCIDR.Get(ti)
assert.True(t, ok)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 1, 1, []string{}, "", "", ti6.String(), "", ""))
assert.NotNil(t, fw.OutRules.AnyProto[1].Any.Any)
ok = fw.OutRules.AnyProto[1].Any.Any.LocalCIDR.Get(ti6)
assert.True(t, ok)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(true, iputil.IPProtocolUDP, 1, 1, []string{"g1"}, "", "", "", "ca-name", ""))
assert.Contains(t, fw.InRules.UDP[1].CANames, "ca-name")
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(true, iputil.IPProtocolUDP, 1, 1, []string{"g1"}, "", "", "", "", "ca-sha"))
assert.Contains(t, fw.InRules.UDP[1].CAShas, "ca-sha")
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 0, 0, []string{}, "any", "", "", "", ""))
assert.True(t, fw.OutRules.AnyProto[0].Any.Any.Any)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
anyIp, err := netip.ParsePrefix("0.0.0.0/0")
require.NoError(t, err)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 0, 0, []string{}, "", anyIp.String(), "", "", ""))
assert.Nil(t, fw.OutRules.AnyProto[0].Any.Any)
table, ok := fw.OutRules.AnyProto[0].Any.CIDR.Lookup(netip.MustParseAddr("1.1.1.1"))
assert.True(t, table.Any)
table, ok = fw.OutRules.AnyProto[0].Any.CIDR.Lookup(netip.MustParseAddr("9::9"))
assert.False(t, ok)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
anyIp6, err := netip.ParsePrefix("::/0")
require.NoError(t, err)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 0, 0, []string{}, "", anyIp6.String(), "", "", ""))
assert.Nil(t, fw.OutRules.AnyProto[0].Any.Any)
table, ok = fw.OutRules.AnyProto[0].Any.CIDR.Lookup(netip.MustParseAddr("9::9"))
assert.True(t, table.Any)
table, ok = fw.OutRules.AnyProto[0].Any.CIDR.Lookup(netip.MustParseAddr("1.1.1.1"))
assert.False(t, ok)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 0, 0, []string{}, "", "any", "", "", ""))
assert.True(t, fw.OutRules.AnyProto[0].Any.Any.Any)
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 0, 0, []string{}, "", "", anyIp.String(), "", ""))
assert.False(t, fw.OutRules.AnyProto[0].Any.Any.Any)
assert.True(t, fw.OutRules.AnyProto[0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("1.1.1.1")))
assert.False(t, fw.OutRules.AnyProto[0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("9::9")))
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 0, 0, []string{}, "", "", anyIp6.String(), "", ""))
assert.False(t, fw.OutRules.AnyProto[0].Any.Any.Any)
assert.True(t, fw.OutRules.AnyProto[0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("9::9")))
assert.False(t, fw.OutRules.AnyProto[0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("1.1.1.1")))
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.NoError(t, fw.AddRule(false, firewall.ProtoAny, 0, 0, []string{}, "", "", "any", "", ""))
assert.True(t, fw.OutRules.AnyProto[0].Any.Any.Any)
// Test error conditions
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c)
require.Error(t, fw.AddRule(true, math.MaxUint8, 0, 0, []string{}, "", "", "", "", ""))
require.Error(t, fw.AddRule(true, firewall.ProtoAny, 10, 0, []string{}, "", "", "", "", ""))
}
func TestFirewall_Drop(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("1.1.1.1/8"))
p := firewall.Packet{
LocalAddr: netip.MustParseAddr("1.2.3.4"),
RemoteAddr: netip.MustParseAddr("1.2.3.4"),
LocalPort: 10,
RemotePort: 90,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
c := dummyCert{
name: "host1",
networks: []netip.Prefix{netip.MustParsePrefix("1.2.3.4/24")},
groups: []string{"default-group"},
issuer: "signer-shasum",
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &cert.CachedCertificate{
Certificate: &c,
InvertedGroups: map[string]struct{}{"default-group": {}},
},
},
vpnAddrs: []netip.Addr{netip.MustParseAddr("1.2.3.4")},
}
h.buildNetworks(myVpnNetworksTable, &c)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
cp := cert.NewCAPool()
// Drop outbound
assert.Equal(t, ErrNoMatchingRule, fw.Drop(p, false, &h, cp, nil))
// Allow inbound
resetConntrack(fw)
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
// Allow outbound because conntrack
require.NoError(t, fw.Drop(p, false, &h, cp, nil))
// test remote mismatch
oldRemote := p.RemoteAddr
p.RemoteAddr = netip.MustParseAddr("1.2.3.10")
assert.Equal(t, fw.Drop(p, false, &h, cp, nil), ErrInvalidRemoteIP)
p.RemoteAddr = oldRemote
// ensure signer doesn't get in the way of group checks
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "", "signer-shasum"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "", "signer-shasum-bad"))
assert.Equal(t, fw.Drop(p, true, &h, cp, nil), ErrNoMatchingRule)
// test caSha doesn't drop on match
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "", "signer-shasum-bad"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "", "signer-shasum"))
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
// ensure ca name doesn't get in the way of group checks
cp.CAs["signer-shasum"] = &cert.CachedCertificate{Certificate: &dummyCert{name: "ca-good"}}
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "ca-good", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "ca-good-bad", ""))
assert.Equal(t, fw.Drop(p, true, &h, cp, nil), ErrNoMatchingRule)
// test caName doesn't drop on match
cp.CAs["signer-shasum"] = &cert.CachedCertificate{Certificate: &dummyCert{name: "ca-good"}}
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "ca-good-bad", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "ca-good", ""))
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
}
// TestFirewall_DropOverlaySourceThroughUnsafeNetwork: a peer whose unsafe network
// overlaps our overlay may not send as another node of it. Its own address and sources
// outside the overlay still pass through the unsafe network, and outbound to such an
// address, where the address is a destination, is not the firewall's to refuse here.
func TestFirewall_DropOverlaySourceThroughUnsafeNetwork(t *testing.T) {
l := test.NewLogger()
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("1.2.3.0/24"))
me := dummyCert{name: "me", networks: []netip.Prefix{netip.MustParsePrefix("1.2.3.4/24")}}
// A router for 1.2.0.0/16, which contains the whole overlay.
peer := dummyCert{
name: "router",
networks: []netip.Prefix{netip.MustParsePrefix("1.2.3.9/24")},
unsafeNetworks: []netip.Prefix{netip.MustParsePrefix("1.2.0.0/16")},
groups: []string{"default-group"},
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &cert.CachedCertificate{Certificate: &peer, InvertedGroups: map[string]struct{}{"default-group": {}}},
},
vpnAddrs: []netip.Addr{netip.MustParseAddr("1.2.3.9")},
}
h.buildNetworks(myVpnNetworksTable, &peer)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, &me)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
cp := cert.NewCAPool()
packet := func(remote string) firewall.Packet {
return firewall.Packet{
LocalAddr: netip.MustParseAddr("1.2.3.4"),
RemoteAddr: netip.MustParseAddr(remote),
LocalPort: 10,
RemotePort: 90,
Protocol: iputil.IPProtocolUDP,
}
}
// Another node's overlay address, through the unsafe network: refused.
assert.Equal(t, ErrInvalidRemoteIP, fw.Drop(packet("1.2.3.10"), true, &h, cp, nil))
assert.Equal(t, int64(1), fw.incomingMetrics.droppedRemoteAddr.Count())
// The peer's own address, and an address outside the overlay it routes for: served.
require.NoError(t, fw.Drop(packet("1.2.3.9"), true, &h, cp, nil))
require.NoError(t, fw.Drop(packet("1.2.5.5"), true, &h, cp, nil))
// Outbound to the overlay address via the router is not refused here; it meets the
// outbound rules as before.
resetConntrack(fw)
assert.Equal(t, ErrNoMatchingRule, fw.Drop(packet("1.2.3.10"), false, &h, cp, nil))
}
func TestFirewall_DropV6(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("fd00::/7"))
p := firewall.Packet{
LocalAddr: netip.MustParseAddr("fd12::34"),
RemoteAddr: netip.MustParseAddr("fd12::34"),
LocalPort: 10,
RemotePort: 90,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
c := dummyCert{
name: "host1",
networks: []netip.Prefix{netip.MustParsePrefix("fd12::34/120")},
groups: []string{"default-group"},
issuer: "signer-shasum",
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &cert.CachedCertificate{
Certificate: &c,
InvertedGroups: map[string]struct{}{"default-group": {}},
},
},
vpnAddrs: []netip.Addr{netip.MustParseAddr("fd12::34")},
}
h.buildNetworks(myVpnNetworksTable, &c)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
cp := cert.NewCAPool()
// Drop outbound
assert.Equal(t, ErrNoMatchingRule, fw.Drop(p, false, &h, cp, nil))
// Allow inbound
resetConntrack(fw)
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
// Allow outbound because conntrack
require.NoError(t, fw.Drop(p, false, &h, cp, nil))
// test remote mismatch
oldRemote := p.RemoteAddr
p.RemoteAddr = netip.MustParseAddr("fd12::56")
assert.Equal(t, fw.Drop(p, false, &h, cp, nil), ErrInvalidRemoteIP)
p.RemoteAddr = oldRemote
// ensure signer doesn't get in the way of group checks
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "", "signer-shasum"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "", "signer-shasum-bad"))
assert.Equal(t, fw.Drop(p, true, &h, cp, nil), ErrNoMatchingRule)
// test caSha doesn't drop on match
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "", "signer-shasum-bad"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "", "signer-shasum"))
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
// ensure ca name doesn't get in the way of group checks
cp.CAs["signer-shasum"] = &cert.CachedCertificate{Certificate: &dummyCert{name: "ca-good"}}
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "ca-good", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "ca-good-bad", ""))
assert.Equal(t, fw.Drop(p, true, &h, cp, nil), ErrNoMatchingRule)
// test caName doesn't drop on match
cp.CAs["signer-shasum"] = &cert.CachedCertificate{Certificate: &dummyCert{name: "ca-good"}}
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"nope"}, "", "", "", "ca-good-bad", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", "", "", "ca-good", ""))
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
}
func BenchmarkFirewallTable_match(b *testing.B) {
f := &Firewall{}
ft := FirewallTable{
TCP: firewallPort{},
}
pfix := netip.MustParsePrefix("172.1.1.1/32")
_ = ft.TCP.addRule(f, 10, 10, []string{"good-group"}, "good-host", pfix.String(), "", "", "")
_ = ft.TCP.addRule(f, 100, 100, []string{"good-group"}, "good-host", "", pfix.String(), "", "")
pfix6 := netip.MustParsePrefix("fd11::11/128")
_ = ft.TCP.addRule(f, 10, 10, []string{"good-group"}, "good-host", pfix6.String(), "", "", "")
_ = ft.TCP.addRule(f, 100, 100, []string{"good-group"}, "good-host", "", pfix6.String(), "", "")
cp := cert.NewCAPool()
b.Run("fail on proto", func(b *testing.B) {
// This benchmark is showing us the cost of failing to match the protocol
c := &cert.CachedCertificate{
Certificate: &dummyCert{},
}
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolUDP}, true, c, cp))
}
})
b.Run("pass proto, fail on port", func(b *testing.B) {
// This benchmark is showing us the cost of matching a specific protocol but failing to match the port
c := &cert.CachedCertificate{
Certificate: &dummyCert{},
}
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 1}, true, c, cp))
}
})
b.Run("pass proto, port, fail on local CIDR", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{},
}
ip := netip.MustParsePrefix("9.254.254.254/32")
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 100, LocalAddr: ip.Addr()}, true, c, cp))
}
})
b.Run("pass proto, port, fail on local CIDRv6", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{},
}
ip := netip.MustParsePrefix("fd99::99/128")
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 100, LocalAddr: ip.Addr()}, true, c, cp))
}
})
b.Run("pass proto, port, any local CIDR, fail all group, name, and cidr", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "nope",
networks: []netip.Prefix{netip.MustParsePrefix("9.254.254.245/32")},
},
InvertedGroups: map[string]struct{}{"nope": {}},
}
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 10}, true, c, cp))
}
})
b.Run("pass proto, port, any local CIDRv6, fail all group, name, and cidr", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "nope",
networks: []netip.Prefix{netip.MustParsePrefix("fd99::99/128")},
},
InvertedGroups: map[string]struct{}{"nope": {}},
}
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 10}, true, c, cp))
}
})
b.Run("pass proto, port, specific local CIDR, fail all group, name, and cidr", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "nope",
networks: []netip.Prefix{netip.MustParsePrefix("9.254.254.245/32")},
},
InvertedGroups: map[string]struct{}{"nope": {}},
}
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 100, LocalAddr: pfix.Addr()}, true, c, cp))
}
})
b.Run("pass proto, port, specific local CIDRv6, fail all group, name, and cidr", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "nope",
networks: []netip.Prefix{netip.MustParsePrefix("fd99::99/128")},
},
InvertedGroups: map[string]struct{}{"nope": {}},
}
for n := 0; n < b.N; n++ {
assert.False(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 100, LocalAddr: pfix6.Addr()}, true, c, cp))
}
})
b.Run("pass on group on any local cidr", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "nope",
},
InvertedGroups: map[string]struct{}{"good-group": {}},
}
for n := 0; n < b.N; n++ {
assert.True(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 10}, true, c, cp))
}
})
b.Run("pass on group on specific local cidr", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "nope",
},
InvertedGroups: map[string]struct{}{"good-group": {}},
}
for n := 0; n < b.N; n++ {
assert.True(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 100, LocalAddr: pfix.Addr()}, true, c, cp))
}
})
b.Run("pass on group on specific local cidr6", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "nope",
},
InvertedGroups: map[string]struct{}{"good-group": {}},
}
for n := 0; n < b.N; n++ {
assert.True(b, ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 100, LocalAddr: pfix6.Addr()}, true, c, cp))
}
})
b.Run("pass on name", func(b *testing.B) {
c := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "good-host",
},
InvertedGroups: map[string]struct{}{"nope": {}},
}
for n := 0; n < b.N; n++ {
ft.match(firewall.Packet{Protocol: iputil.IPProtocolTCP, LocalPort: 10}, true, c, cp)
}
})
}
func TestFirewall_Drop2(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("1.1.1.1/8"))
p := firewall.Packet{
LocalAddr: netip.MustParseAddr("1.2.3.4"),
RemoteAddr: netip.MustParseAddr("1.2.3.4"),
LocalPort: 10,
RemotePort: 90,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
network := netip.MustParsePrefix("1.2.3.4/24")
c := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host1",
networks: []netip.Prefix{network},
},
InvertedGroups: map[string]struct{}{"default-group": {}, "test-group": {}},
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c,
},
vpnAddrs: []netip.Addr{network.Addr()},
}
h.buildNetworks(myVpnNetworksTable, c.Certificate)
c1 := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host1",
networks: []netip.Prefix{network},
},
InvertedGroups: map[string]struct{}{"default-group": {}, "test-group-not": {}},
}
h1 := HostInfo{
vpnAddrs: []netip.Addr{network.Addr()},
ConnectionState: &ConnectionState{
peerCert: &c1,
},
}
h1.buildNetworks(myVpnNetworksTable, c1.Certificate)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group", "test-group"}, "", "", "", "", ""))
cp := cert.NewCAPool()
// h1/c1 lacks the proper groups
require.ErrorIs(t, fw.Drop(p, true, &h1, cp, nil), ErrNoMatchingRule)
// c has the proper groups
resetConntrack(fw)
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
}
func TestFirewall_Drop3(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("1.1.1.1/8"))
p := firewall.Packet{
LocalAddr: netip.MustParseAddr("1.2.3.4"),
RemoteAddr: netip.MustParseAddr("1.2.3.4"),
LocalPort: 1,
RemotePort: 1,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
network := netip.MustParsePrefix("1.2.3.4/24")
c := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host-owner",
networks: []netip.Prefix{network},
},
}
c1 := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host1",
networks: []netip.Prefix{network},
issuer: "signer-sha-bad",
},
}
h1 := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c1,
},
vpnAddrs: []netip.Addr{network.Addr()},
}
h1.buildNetworks(myVpnNetworksTable, c1.Certificate)
c2 := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host2",
networks: []netip.Prefix{network},
issuer: "signer-sha",
},
}
h2 := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c2,
},
vpnAddrs: []netip.Addr{network.Addr()},
}
h2.buildNetworks(myVpnNetworksTable, c2.Certificate)
c3 := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host3",
networks: []netip.Prefix{network},
issuer: "signer-sha-bad",
},
}
h3 := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c3,
},
vpnAddrs: []netip.Addr{network.Addr()},
}
h3.buildNetworks(myVpnNetworksTable, c3.Certificate)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 1, 1, []string{}, "host1", "", "", "", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 1, 1, []string{}, "", "", "", "", "signer-sha"))
cp := cert.NewCAPool()
// c1 should pass because host match
require.NoError(t, fw.Drop(p, true, &h1, cp, nil))
// c2 should pass because ca sha match
resetConntrack(fw)
require.NoError(t, fw.Drop(p, true, &h2, cp, nil))
// c3 should fail because no match
resetConntrack(fw)
assert.Equal(t, fw.Drop(p, true, &h3, cp, nil), ErrNoMatchingRule)
// Test a remote address match
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 1, 1, []string{}, "", "1.2.3.4/24", "", "", ""))
require.NoError(t, fw.Drop(p, true, &h1, cp, nil))
}
func TestFirewall_Drop3V6(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("fd00::/7"))
p := firewall.Packet{
LocalAddr: netip.MustParseAddr("fd12::34"),
RemoteAddr: netip.MustParseAddr("fd12::34"),
LocalPort: 1,
RemotePort: 1,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
network := netip.MustParsePrefix("fd12::34/120")
c := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host-owner",
networks: []netip.Prefix{network},
},
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c,
},
vpnAddrs: []netip.Addr{network.Addr()},
}
h.buildNetworks(myVpnNetworksTable, c.Certificate)
// Test a remote address match
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
cp := cert.NewCAPool()
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 1, 1, []string{}, "", "fd12::34/120", "", "", ""))
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
}
func TestFirewall_DropConntrackReload(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("1.1.1.1/8"))
p := firewall.Packet{
LocalAddr: netip.MustParseAddr("1.2.3.4"),
RemoteAddr: netip.MustParseAddr("1.2.3.4"),
LocalPort: 10,
RemotePort: 90,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
network := netip.MustParsePrefix("1.2.3.4/24")
c := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host1",
networks: []netip.Prefix{network},
groups: []string{"default-group"},
issuer: "signer-shasum",
},
InvertedGroups: map[string]struct{}{"default-group": {}},
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c,
},
vpnAddrs: []netip.Addr{network.Addr()},
}
h.buildNetworks(myVpnNetworksTable, c.Certificate)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
cp := cert.NewCAPool()
// Drop outbound
assert.Equal(t, fw.Drop(p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
// Allow outbound because conntrack
require.NoError(t, fw.Drop(p, false, &h, cp, nil))
oldFw := fw
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 10, 10, []string{"any"}, "", "", "", "", ""))
fw.Conntrack = oldFw.Conntrack
fw.rulesVersion = oldFw.rulesVersion + 1
// Allow outbound because conntrack and new rules allow port 10
require.NoError(t, fw.Drop(p, false, &h, cp, nil))
oldFw = fw
fw = NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 11, 11, []string{"any"}, "", "", "", "", ""))
fw.Conntrack = oldFw.Conntrack
fw.rulesVersion = oldFw.rulesVersion + 1
// Drop outbound because conntrack doesn't match new ruleset
assert.Equal(t, fw.Drop(p, false, &h, cp, nil), ErrNoMatchingRule)
}
func TestFirewall_ICMPPortBehavior(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("1.1.1.1/8"))
network := netip.MustParsePrefix("1.2.3.4/24")
c := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host1",
networks: []netip.Prefix{network},
groups: []string{"default-group"},
issuer: "signer-shasum",
},
InvertedGroups: map[string]struct{}{"default-group": {}},
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c,
},
vpnAddrs: []netip.Addr{network.Addr()},
}
h.buildNetworks(myVpnNetworksTable, c.Certificate)
cp := cert.NewCAPool()
templ := firewall.Packet{
LocalAddr: netip.MustParseAddr("1.2.3.4"),
RemoteAddr: netip.MustParseAddr("1.2.3.4"),
Protocol: iputil.IPProtocolICMP,
Fragment: false,
}
t.Run("ICMP allowed", func(t *testing.T) {
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, iputil.IPProtocolICMP, 0, 0, []string{"any"}, "", "", "", "", ""))
t.Run("zero ports", func(t *testing.T) {
p := templ.Copy()
p.LocalPort = 0
p.RemotePort = 0
// Drop outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
require.NoError(t, fw.Drop(*p, true, &h, cp, nil))
//now also allow outbound
require.NoError(t, fw.Drop(*p, false, &h, cp, nil))
})
t.Run("nonzero ports", func(t *testing.T) {
p := templ.Copy()
p.LocalPort = 0xabcd
p.RemotePort = 0x1234
// Drop outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
require.NoError(t, fw.Drop(*p, true, &h, cp, nil))
//now also allow outbound
require.NoError(t, fw.Drop(*p, false, &h, cp, nil))
})
})
t.Run("Any proto, some ports allowed", func(t *testing.T) {
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 80, 444, []string{"any"}, "", "", "", "", ""))
t.Run("zero ports, still blocked", func(t *testing.T) {
p := templ.Copy()
p.LocalPort = 0
p.RemotePort = 0
// Drop outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
assert.Equal(t, fw.Drop(*p, true, &h, cp, nil), ErrNoMatchingRule)
//now also allow outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
})
t.Run("nonzero ports, still blocked", func(t *testing.T) {
p := templ.Copy()
p.LocalPort = 0xabcd
p.RemotePort = 0x1234
// Drop outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
assert.Equal(t, fw.Drop(*p, true, &h, cp, nil), ErrNoMatchingRule)
//now also allow outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
})
t.Run("nonzero, matching ports, still blocked", func(t *testing.T) {
p := templ.Copy()
p.LocalPort = 80
p.RemotePort = 80
// Drop outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
assert.Equal(t, fw.Drop(*p, true, &h, cp, nil), ErrNoMatchingRule)
//now also allow outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
})
})
t.Run("Any proto, any port", func(t *testing.T) {
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
t.Run("zero ports, allowed", func(t *testing.T) {
resetConntrack(fw)
p := templ.Copy()
p.LocalPort = 0
p.RemotePort = 0
// Drop outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
require.NoError(t, fw.Drop(*p, true, &h, cp, nil))
//now also allow outbound
require.NoError(t, fw.Drop(*p, false, &h, cp, nil))
})
t.Run("nonzero ports, allowed", func(t *testing.T) {
resetConntrack(fw)
p := templ.Copy()
p.LocalPort = 0xabcd
p.RemotePort = 0x1234
// Drop outbound
assert.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
// Allow inbound
resetConntrack(fw)
require.NoError(t, fw.Drop(*p, true, &h, cp, nil))
//now also allow outbound
require.NoError(t, fw.Drop(*p, false, &h, cp, nil))
//different ID is blocked
p.RemotePort++
require.Equal(t, fw.Drop(*p, false, &h, cp, nil), ErrNoMatchingRule)
})
})
}
func TestFirewall_DropIPSpoofing(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("192.0.2.1/24"))
c := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host-owner",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.1/24")},
},
}
c1 := cert.CachedCertificate{
Certificate: &dummyCert{
name: "host",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.2/24")},
unsafeNetworks: []netip.Prefix{netip.MustParsePrefix("198.51.100.0/24")},
},
}
h1 := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &c1,
},
vpnAddrs: []netip.Addr{c1.Certificate.Networks()[0].Addr()},
}
h1.buildNetworks(myVpnNetworksTable, c1.Certificate)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, c.Certificate)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 1, 1, []string{}, "", "", "", "", ""))
cp := cert.NewCAPool()
// Packet spoofed by `c1`. Note that the remote addr is not a valid one.
p := firewall.Packet{
LocalAddr: netip.MustParseAddr("192.0.2.1"),
RemoteAddr: netip.MustParseAddr("192.0.2.3"),
LocalPort: 1,
RemotePort: 1,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
assert.Equal(t, fw.Drop(p, true, &h1, cp, nil), ErrInvalidRemoteIP)
}
func TestFirewall_ConntrackSourceSpoofingAcrossPeers(t *testing.T) {
l := test.NewLoggerWithOutput(&bytes.Buffer{})
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("192.0.2.1/24"))
owner := &dummyCert{
name: "owner",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.1/24")},
}
victim := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "victim",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.2/24")},
},
}
victimHI := HostInfo{
ConnectionState: &ConnectionState{peerCert: victim},
vpnAddrs: []netip.Addr{netip.MustParseAddr("192.0.2.2")},
}
victimHI.buildNetworks(myVpnNetworksTable, victim.Certificate)
attacker := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "attacker",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.3/24")},
},
}
attackerHI := HostInfo{
ConnectionState: &ConnectionState{peerCert: attacker},
vpnAddrs: []netip.Addr{netip.MustParseAddr("192.0.2.3")},
}
attackerHI.buildNetworks(myVpnNetworksTable, attacker.Certificate)
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, owner)
// Allow any inbound traffic that passes the cert / source-IP checks.
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
cp := cert.NewCAPool()
flow := firewall.Packet{
LocalAddr: netip.MustParseAddr("192.0.2.1"),
RemoteAddr: netip.MustParseAddr("192.0.2.2"),
LocalPort: 443,
RemotePort: 55000,
Protocol: iputil.IPProtocolUDP,
}
require.NoError(t, fw.Drop(flow, true, &victimHI, cp, nil),
"victim's own traffic from its own overlay IP must be allowed")
unseen := flow
unseen.RemotePort = 55001
assert.Equal(t, ErrInvalidRemoteIP, fw.Drop(unseen, true, &attackerHI, cp, nil),
"sanity: attacker forging victim's source IP must be rejected when no conntrack entry exists")
got := fw.Drop(flow, true, &attackerHI, cp, nil)
t.Logf("attacker replaying victim's 4-tuple: Drop returned %v (nil == packet ALLOWED == spoof succeeded)", got)
assert.Equal(t, ErrInvalidRemoteIP, got,
"SECURITY: attacker spoofed victim's overlay source IP (192.0.2.2) by reusing an existing conntrack 4-tuple; Drop returned %v instead of rejecting", got)
}
// BenchmarkFirewallDropConntrackHit measures Drop on an already-established flow
// (a conntrack hit). This is the fast path that the source-IP<->cert binding
// reordering adds work to, so it quantifies the cost of moving the address checks
// ahead of the conntrack lookup. Cases:
// - simple: peer cert has one address, no unsafe networks (h.networks == nil),
// so the remote-address check is a single netip.Addr compare.
// - complex: peer cert has unsafe networks (h.networks populated), so the
// remote-address check is a BART lookup.
// - noCache/localCache: whether a per-batch ConntrackCache is supplied, which in
// the original code let the fast path skip straight past the address checks.
func BenchmarkFirewallDropConntrackHit(b *testing.B) {
l := test.NewLoggerWithOutput(&bytes.Buffer{})
myVpnNetworksTable := new(bart.Lite)
myVpnNetworksTable.Insert(netip.MustParsePrefix("192.0.2.1/24"))
owner := &dummyCert{
name: "owner",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.1/24")},
}
simpleCert := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "simple",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.2/24")},
},
}
simpleHost := &HostInfo{
ConnectionState: &ConnectionState{peerCert: simpleCert},
vpnAddrs: []netip.Addr{netip.MustParseAddr("192.0.2.2")},
}
simpleHost.buildNetworks(myVpnNetworksTable, simpleCert.Certificate)
complexCert := &cert.CachedCertificate{
Certificate: &dummyCert{
name: "complex",
networks: []netip.Prefix{netip.MustParsePrefix("192.0.2.2/24")},
unsafeNetworks: []netip.Prefix{netip.MustParsePrefix("198.51.100.0/24")},
},
}
complexHost := &HostInfo{
ConnectionState: &ConnectionState{peerCert: complexCert},
vpnAddrs: []netip.Addr{netip.MustParseAddr("192.0.2.2")},
}
complexHost.buildNetworks(myVpnNetworksTable, complexCert.Certificate)
cp := cert.NewCAPool()
flow := firewall.Packet{
LocalAddr: netip.MustParseAddr("192.0.2.1"),
RemoteAddr: netip.MustParseAddr("192.0.2.2"),
LocalPort: 443,
RemotePort: 55000,
Protocol: iputil.IPProtocolUDP,
}
cases := []struct {
name string
host *HostInfo
useCache bool
}{
{"simple/noCache", simpleHost, false},
{"simple/localCache", simpleHost, true},
{"complex/noCache", complexHost, false},
{"complex/localCache", complexHost, true},
}
for _, tc := range cases {
b.Run(tc.name, func(b *testing.B) {
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, owner)
require.NoError(b, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
// Establish the conntrack entry so every benchmarked Drop is a hit.
require.NoError(b, fw.Drop(flow, true, tc.host, cp, nil))
var cache firewall.ConntrackCache
if tc.useCache {
cache = firewall.ConntrackCache{}
}
b.ReportAllocs()
b.ResetTimer()
for i := 0; i < b.N; i++ {
if err := fw.Drop(flow, true, tc.host, cp, cache); err != nil {
b.Fatal(err)
}
}
})
}
}
func BenchmarkLookup(b *testing.B) {
ml := func(m map[string]struct{}, a [][]string) {
for n := 0; n < b.N; n++ {
for _, sg := range a {
found := false
for _, g := range sg {
if _, ok := m[g]; !ok {
found = false
break
}
found = true
}
if found {
return
}
}
}
}
b.Run("array to map best", func(b *testing.B) {
m := map[string]struct{}{
"1ne": {},
"2wo": {},
"3hr": {},
"4ou": {},
"5iv": {},
"6ix": {},
}
a := [][]string{
{"1ne", "2wo", "3hr", "4ou", "5iv", "6ix"},
{"one", "2wo", "3hr", "4ou", "5iv", "6ix"},
{"one", "two", "3hr", "4ou", "5iv", "6ix"},
{"one", "two", "thr", "4ou", "5iv", "6ix"},
{"one", "two", "thr", "fou", "5iv", "6ix"},
{"one", "two", "thr", "fou", "fiv", "6ix"},
{"one", "two", "thr", "fou", "fiv", "six"},
}
for n := 0; n < b.N; n++ {
ml(m, a)
}
})
b.Run("array to map worst", func(b *testing.B) {
m := map[string]struct{}{
"one": {},
"two": {},
"thr": {},
"fou": {},
"fiv": {},
"six": {},
}
a := [][]string{
{"1ne", "2wo", "3hr", "4ou", "5iv", "6ix"},
{"one", "2wo", "3hr", "4ou", "5iv", "6ix"},
{"one", "two", "3hr", "4ou", "5iv", "6ix"},
{"one", "two", "thr", "4ou", "5iv", "6ix"},
{"one", "two", "thr", "fou", "5iv", "6ix"},
{"one", "two", "thr", "fou", "fiv", "6ix"},
{"one", "two", "thr", "fou", "fiv", "six"},
}
for n := 0; n < b.N; n++ {
ml(m, a)
}
})
}
func Test_parsePort(t *testing.T) {
_, _, err := parsePort("")
require.EqualError(t, err, "was not a number; ``")
_, _, err = parsePort(" ")
require.EqualError(t, err, "was not a number; ` `")
_, _, err = parsePort("-")
require.EqualError(t, err, "appears to be a range but could not be parsed; `-`")
_, _, err = parsePort(" - ")
require.EqualError(t, err, "appears to be a range but could not be parsed; ` - `")
_, _, err = parsePort("a-b")
require.EqualError(t, err, "beginning range was not a number; `a`")
_, _, err = parsePort("1-b")
require.EqualError(t, err, "ending range was not a number; `b`")
s, e, err := parsePort(" 1 - 2 ")
assert.Equal(t, int32(1), s)
assert.Equal(t, int32(2), e)
require.NoError(t, err)
s, e, err = parsePort("0-1")
assert.Equal(t, int32(0), s)
assert.Equal(t, int32(0), e)
require.NoError(t, err)
s, e, err = parsePort("9919")
assert.Equal(t, int32(9919), s)
assert.Equal(t, int32(9919), e)
require.NoError(t, err)
s, e, err = parsePort("any")
assert.Equal(t, int32(0), s)
assert.Equal(t, int32(0), e)
require.NoError(t, err)
}
// Test_parsePort_invalid covers inputs that must error. The named bug is
// that int32(strconv.Atoi("4294967296")) truncates to 0 == firewall.PortAny,
// silently turning a typo into a match-all-ports rule; the rest are
// representative syntax/range probes.
func Test_parsePort_invalid(t *testing.T) {
tests := []struct {
name string
input string
wantErrContains string
}{
// Numeric overflow (the named bug + boundary).
{"named bug: 2^32 truncates to PortAny", "4294967296", "out of range"},
{"just above max real port", "65536", "out of range"},
// Negatives route through the range branch and hit the empty-half
// guard; included as defense in depth so a future refactor cannot
// accidentally reach the int32 cast.
{"negative", "-1", "could not be parsed"},
// Syntax probes.
{"NUL between digits", "4\x002", "was not a number"},
{"hex notation", "0x10", "was not a number"},
{"scientific notation", "1e3", "was not a number"},
{"leading whitespace", " 42", "was not a number"},
{"fullwidth digits", "４２", "was not a number"},
// Range branch.
{"range upper out of range", "1-65536", "ending range out of range"},
{"range lower out of range", "65536-65537", "beginning range out of range"},
{"range with negative upper", "1--1", "ending range was not a number"},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
_, _, err := parsePort(tc.input)
require.Error(t, err, "input %q must error", tc.input)
require.ErrorContains(t, err, tc.wantErrContains)
})
}
}
// Test_parsePort_valid_boundaries locks in success cases at 0, 1, and 65535
// so a future refactor cannot regress the boundaries.
func Test_parsePort_valid_boundaries(t *testing.T) {
tests := []struct {
name string
input string
wantStart int32
wantEnd int32
}{
{"zero is PortAny", "0", 0, 0},
{"min real port", "1", 1, 1},
{"max real port", "65535", 65535, 65535},
{"range zero to max forces end to zero", "0-65535", 0, 0},
{"range max to max", "65535-65535", 65535, 65535},
{"range one to max", "1-65535", 1, 65535},
{"range with whitespace inside", " 1 - 2 ", 1, 2},
}
for _, tc := range tests {
t.Run(tc.name, func(t *testing.T) {
s, e, err := parsePort(tc.input)
require.NoError(t, err)
assert.Equal(t, tc.wantStart, s, "start port")
assert.Equal(t, tc.wantEnd, e, "end port")
})
}
}
func TestNewFirewallFromConfig(t *testing.T) {
l := test.NewLogger()
// Test a bad rule definition
c := &dummyCert{}
cs, err := newCertState(cert.Version2, nil, c, false, cert.Curve_CURVE25519, nil, "aes")
require.NoError(t, err)
conf := config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"outbound": "asdf"}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound failed to parse, should be an array of rules")
// Test both port and code
conf = config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"port": "1", "code": "2"}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound rule #0; only one of port or code should be provided")
// Test missing host, group, cidr, ca_name and ca_sha
conf = config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound rule #0; at least one of host, group, cidr, local_cidr, ca_name, or ca_sha must be provided")
// Test code/port error
conf = config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"code": "a", "host": "testh", "proto": "any"}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound rule #0; code was not a number; `a`")
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"port": "a", "host": "testh", "proto": "any"}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound rule #0; port was not a number; `a`")
// Test proto error
conf = config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"code": "1", "host": "testh"}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound rule #0; proto was not understood; ``")
// Test cidr parse error
conf = config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"code": "1", "cidr": "testh", "proto": "any"}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound rule #0; cidr did not parse; netip.ParsePrefix(\"testh\"): no '/'")
// Test local_cidr parse error
conf = config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"code": "1", "local_cidr": "testh", "proto": "any"}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.outbound rule #0; local_cidr did not parse; netip.ParsePrefix(\"testh\"): no '/'")
// Test both group and groups
conf = config.NewC(test.NewLogger())
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "group": "a", "groups": []string{"b", "c"}}}}
_, err = NewFirewallFromConfig(l, cs, conf)
require.EqualError(t, err, "firewall.inbound rule #0; only one of group or groups should be defined, both provided")
}
func TestAddFirewallRulesFromConfig(t *testing.T) {
l := test.NewLogger()
// Test adding tcp rule
conf := config.NewC(test.NewLogger())
mf := &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"port": "1", "proto": "tcp", "host": "a"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, false, conf, mf))
assert.Equal(t, addRuleCall{incoming: false, proto: iputil.IPProtocolTCP, startPort: 1, endPort: 1, groups: nil, host: "a", ip: "", localIp: ""}, mf.lastCall)
// Test adding udp rule
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"port": "1", "proto": "udp", "host": "a"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, false, conf, mf))
assert.Equal(t, addRuleCall{incoming: false, proto: iputil.IPProtocolUDP, startPort: 1, endPort: 1, groups: nil, host: "a", ip: "", localIp: ""}, mf.lastCall)
// Test adding icmp rule
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"port": "1", "proto": "icmp", "host": "a"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, false, conf, mf))
assert.Equal(t, addRuleCall{incoming: false, proto: iputil.IPProtocolICMP, startPort: firewall.PortAny, endPort: firewall.PortAny, groups: nil, host: "a", ip: "", localIp: ""}, mf.lastCall)
// Test adding icmp rule no port
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"proto": "icmp", "host": "a"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, false, conf, mf))
assert.Equal(t, addRuleCall{incoming: false, proto: iputil.IPProtocolICMP, startPort: firewall.PortAny, endPort: firewall.PortAny, groups: nil, host: "a", ip: "", localIp: ""}, mf.lastCall)
// Test adding any rule
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "host": "a"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, host: "a", ip: "", localIp: ""}, mf.lastCall)
// Test adding rule with cidr
cidr := netip.MustParsePrefix("10.0.0.0/8")
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "cidr": cidr.String()}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, ip: cidr.String(), localIp: ""}, mf.lastCall)
// Test adding rule with local_cidr
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "local_cidr": cidr.String()}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, ip: "", localIp: cidr.String()}, mf.lastCall)
// Test adding rule with cidr ipv6
cidr6 := netip.MustParsePrefix("fd00::/8")
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "cidr": cidr6.String()}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, ip: cidr6.String(), localIp: ""}, mf.lastCall)
// Test adding rule with any cidr
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "cidr": "any"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, ip: "any", localIp: ""}, mf.lastCall)
// Test adding rule with junk cidr
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "cidr": "junk/junk"}}}
require.EqualError(t, AddFirewallRulesFromConfig(l, true, conf, mf), "firewall.inbound rule #0; cidr did not parse; netip.ParsePrefix(\"junk/junk\"): ParseAddr(\"junk\"): unable to parse IP")
// Test adding rule with local_cidr ipv6
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "local_cidr": cidr6.String()}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, ip: "", localIp: cidr6.String()}, mf.lastCall)
// Test adding rule with any local_cidr
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "local_cidr": "any"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, localIp: "any"}, mf.lastCall)
// Test adding rule with junk local_cidr
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "local_cidr": "junk/junk"}}}
require.EqualError(t, AddFirewallRulesFromConfig(l, true, conf, mf), "firewall.inbound rule #0; local_cidr did not parse; netip.ParsePrefix(\"junk/junk\"): ParseAddr(\"junk\"): unable to parse IP")
// Test adding rule with ca_sha
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "ca_sha": "12312313123"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, ip: "", localIp: "", caSha: "12312313123"}, mf.lastCall)
// Test adding rule with ca_name
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "ca_name": "root01"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: nil, ip: "", localIp: "", caName: "root01"}, mf.lastCall)
// Test single group
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "group": "a"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: []string{"a"}, ip: "", localIp: ""}, mf.lastCall)
// Test single groups
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "groups": "a"}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: []string{"a"}, ip: "", localIp: ""}, mf.lastCall)
// Test multiple AND groups
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "groups": []string{"a", "b"}}}}
require.NoError(t, AddFirewallRulesFromConfig(l, true, conf, mf))
assert.Equal(t, addRuleCall{incoming: true, proto: firewall.ProtoAny, startPort: 1, endPort: 1, groups: []string{"a", "b"}, ip: "", localIp: ""}, mf.lastCall)
// Test Add error
conf = config.NewC(test.NewLogger())
mf = &mockFirewall{}
mf.nextCallReturn = errors.New("test error")
conf.Settings["firewall"] = map[string]any{"inbound": []any{map[string]any{"port": "1", "proto": "any", "host": "a"}}}
require.EqualError(t, AddFirewallRulesFromConfig(l, true, conf, mf), "firewall.inbound rule #0; `test error`")
}
func TestFirewall_convertRule(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
// Ensure group array of 1 is converted and a warning is printed
c := map[string]any{
"group": []any{"group1"},
}
r, err := convertRule(l, c, "test", 1)
assert.Contains(t, ob.String(), "group was an array with a single value, converting to simple value")
assert.Contains(t, ob.String(), "table=test")
assert.Contains(t, ob.String(), "rule=1")
require.NoError(t, err)
assert.Equal(t, []string{"group1"}, r.Groups)
// Ensure group array of > 1 is errord
ob.Reset()
c = map[string]any{
"group": []any{"group1", "group2"},
}
r, err = convertRule(l, c, "test", 1)
assert.Empty(t, ob.String())
require.Error(t, err, "group should contain a single value, an array with more than one entry was provided")
// Make sure a well formed group is alright
ob.Reset()
c = map[string]any{
"group": "group1",
}
r, err = convertRule(l, c, "test", 1)
require.NoError(t, err)
assert.Equal(t, []string{"group1"}, r.Groups)
}
func TestFirewall_convertRuleSanity(t *testing.T) {
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
noWarningPlease := []map[string]any{
{"group": "group1"},
{"groups": []any{"group2"}},
{"host": "bob"},
{"cidr": "1.1.1.1/1"},
{"groups": []any{"group2"}, "host": "bob"},
{"cidr": "1.1.1.1/1", "host": "bob"},
{"groups": []any{"group2"}, "cidr": "1.1.1.1/1"},
{"groups": []any{"group2"}, "cidr": "1.1.1.1/1", "host": "bob"},
}
for _, c := range noWarningPlease {
r, err := convertRule(l, c, "test", 1)
require.NoError(t, err)
require.NoError(t, r.sanity(), "should not generate a sanity warning, %+v", c)
}
yesWarningPlease := []map[string]any{
{"group": "group1"},
{"groups": []any{"group2"}},
{"cidr": "1.1.1.1/1"},
{"groups": []any{"group2"}, "host": "bob"},
{"cidr": "1.1.1.1/1", "host": "bob"},
{"groups": []any{"group2"}, "cidr": "1.1.1.1/1"},
{"groups": []any{"group2"}, "cidr": "1.1.1.1/1", "host": "bob"},
}
for _, c := range yesWarningPlease {
c["host"] = "any"
r, err := convertRule(l, c, "test", 1)
require.NoError(t, err)
err = r.sanity()
require.Error(t, err, "I wanted a warning: %+v", c)
}
//reset the list
yesWarningPlease = []map[string]any{
{"group": "group1"},
{"groups": []any{"group2"}},
{"cidr": "1.1.1.1/1"},
{"groups": []any{"group2"}, "host": "bob"},
{"cidr": "1.1.1.1/1", "host": "bob"},
{"groups": []any{"group2"}, "cidr": "1.1.1.1/1"},
{"groups": []any{"group2"}, "cidr": "1.1.1.1/1", "host": "bob"},
}
for _, c := range yesWarningPlease {
r, err := convertRule(l, c, "test", 1)
require.NoError(t, err)
r.Groups = append(r.Groups, "any")
err = r.sanity()
require.Error(t, err, "I wanted a warning: %+v", c)
}
}
type testcase struct {
h *HostInfo
p firewall.Packet
c cert.Certificate
err error
}
func (c *testcase) Test(t *testing.T, fw *Firewall) {
t.Helper()
cp := cert.NewCAPool()
resetConntrack(fw)
err := fw.Drop(c.p, true, c.h, cp, nil)
if c.err == nil {
require.NoError(t, err, "failed to not drop remote address %s", c.p.RemoteAddr)
} else {
require.ErrorIs(t, c.err, err, "failed to drop remote address %s", c.p.RemoteAddr)
}
}
func buildTestCase(setup testsetup, err error, theirPrefixes ...netip.Prefix) testcase {
c1 := dummyCert{
name: "host1",
networks: theirPrefixes,
groups: []string{"default-group"},
issuer: "signer-shasum",
}
h := HostInfo{
ConnectionState: &ConnectionState{
peerCert: &cert.CachedCertificate{
Certificate: &c1,
InvertedGroups: map[string]struct{}{"default-group": {}},
},
},
vpnAddrs: make([]netip.Addr, len(theirPrefixes)),
}
for i := range theirPrefixes {
h.vpnAddrs[i] = theirPrefixes[i].Addr()
}
h.buildNetworks(setup.myVpnNetworksTable, &c1)
p := firewall.Packet{
LocalAddr: setup.c.Networks()[0].Addr(), //todo?
RemoteAddr: theirPrefixes[0].Addr(),
LocalPort: 10,
RemotePort: 90,
Protocol: iputil.IPProtocolUDP,
Fragment: false,
}
return testcase{
h: &h,
p: p,
c: &c1,
err: err,
}
}
type testsetup struct {
c dummyCert
myVpnNetworksTable *bart.Lite
fw *Firewall
}
func newSetup(t *testing.T, l *slog.Logger, myPrefixes ...netip.Prefix) testsetup {
c := dummyCert{
name: "me",
networks: myPrefixes,
groups: []string{"default-group"},
issuer: "signer-shasum",
}
return newSetupFromCert(t, l, c)
}
func newSetupFromCert(t *testing.T, l *slog.Logger, c dummyCert) testsetup {
myVpnNetworksTable := new(bart.Lite)
for _, prefix := range c.Networks() {
myVpnNetworksTable.Insert(prefix)
}
fw := NewFirewall(l, time.Second, time.Minute, time.Hour, &c)
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", "", "", ""))
return testsetup{
c: c,
fw: fw,
myVpnNetworksTable: myVpnNetworksTable,
}
}
func TestFirewall_Drop_EnforceIPMatch(t *testing.T) {
t.Parallel()
ob := &bytes.Buffer{}
l := test.NewLoggerWithOutput(ob)
myPrefix := netip.MustParsePrefix("1.1.1.1/8")
// for now, it's okay that these are all "incoming", the logic this test tries to check doesn't care about in/out
t.Run("allow inbound all matching", func(t *testing.T) {
t.Parallel()
setup := newSetup(t, l, myPrefix)
tc := buildTestCase(setup, nil, netip.MustParsePrefix("1.2.3.4/24"))
tc.Test(t, setup.fw)
})
t.Run("allow inbound local matching", func(t *testing.T) {
t.Parallel()
setup := newSetup(t, l, myPrefix)
tc := buildTestCase(setup, ErrInvalidLocalIP, netip.MustParsePrefix("1.2.3.4/24"))
tc.p.LocalAddr = netip.MustParseAddr("1.2.3.8")
tc.Test(t, setup.fw)
})
t.Run("block inbound remote mismatched", func(t *testing.T) {
t.Parallel()
setup := newSetup(t, l, myPrefix)
tc := buildTestCase(setup, ErrInvalidRemoteIP, netip.MustParsePrefix("1.2.3.4/24"))
tc.p.RemoteAddr = netip.MustParseAddr("9.9.9.9")
tc.Test(t, setup.fw)
})
t.Run("Block a vpn peer packet", func(t *testing.T) {
t.Parallel()
setup := newSetup(t, l, myPrefix)
tc := buildTestCase(setup, ErrPeerRejected, netip.MustParsePrefix("2.2.2.2/24"))
tc.Test(t, setup.fw)
})
twoPrefixes := []netip.Prefix{
netip.MustParsePrefix("1.2.3.4/24"), netip.MustParsePrefix("2.2.2.2/24"),
}
t.Run("allow inbound one matching", func(t *testing.T) {
t.Parallel()
setup := newSetup(t, l, myPrefix)
tc := buildTestCase(setup, nil, twoPrefixes...)
tc.Test(t, setup.fw)
})
t.Run("block inbound multimismatch", func(t *testing.T) {
t.Parallel()
setup := newSetup(t, l, myPrefix)
tc := buildTestCase(setup, ErrInvalidRemoteIP, twoPrefixes...)
tc.p.RemoteAddr = netip.MustParseAddr("9.9.9.9")
tc.Test(t, setup.fw)
})
t.Run("allow inbound 2nd one matching", func(t *testing.T) {
t.Parallel()
setup2 := newSetup(t, l, netip.MustParsePrefix("2.2.2.1/24"))
tc := buildTestCase(setup2, nil, twoPrefixes...)
tc.p.RemoteAddr = twoPrefixes[1].Addr()
tc.Test(t, setup2.fw)
})
t.Run("allow inbound unsafe route", func(t *testing.T) {
t.Parallel()
unsafePrefix := netip.MustParsePrefix("192.168.0.0/24")
c := dummyCert{
name: "me",
networks: []netip.Prefix{myPrefix},
unsafeNetworks: []netip.Prefix{unsafePrefix},
groups: []string{"default-group"},
issuer: "signer-shasum",
}
unsafeSetup := newSetupFromCert(t, l, c)
tc := buildTestCase(unsafeSetup, nil, twoPrefixes...)
tc.p.LocalAddr = netip.MustParseAddr("192.168.0.3")
tc.err = ErrNoMatchingRule
tc.Test(t, unsafeSetup.fw) //should hit firewall and bounce off
require.NoError(t, unsafeSetup.fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"any"}, "", "", unsafePrefix.String(), "", ""))
tc.err = nil
tc.Test(t, unsafeSetup.fw) //should pass
})
}
type addRuleCall struct {
incoming bool
proto uint8
startPort int32
endPort int32
groups []string
host string
ip string
localIp string
caName string
caSha string
}
type mockFirewall struct {
lastCall addRuleCall
nextCallReturn error
}
func (mf *mockFirewall) AddRule(incoming bool, proto uint8, startPort int32, endPort int32, groups []string, host string, ip, localIp, caName string, caSha string) error {
mf.lastCall = addRuleCall{
incoming: incoming,
proto: proto,
startPort: startPort,
endPort: endPort,
groups: groups,
host: host,
ip: ip,
localIp: localIp,
caName: caName,
caSha: caSha,
}
err := mf.nextCallReturn
mf.nextCallReturn = nil
return err
}
func resetConntrack(fw *Firewall) {
fw.Conntrack.Lock()
fw.Conntrack.Conns = map[firewall.Packet]*conn{}
fw.Conntrack.Unlock()
}
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