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nebula/firewall_test.go
Jack Doan 297767b2e3 warn user if they configure a firewall rule that will allow way more traffic than you might expect (#1513) 
* warn user if they accidentally configure a firewall rule that will allow way more traffic than you might expect

* add groups-contains-any warning
2025-11-19 11:06:34 -06:00

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package nebula
import (
"bytes"
"errors"
"math"
"net/netip"
"testing"
"time"
"github.com/gaissmai/bart"
"github.com/sirupsen/logrus"
"github.com/slackhq/nebula/cert"
"github.com/slackhq/nebula/config"
"github.com/slackhq/nebula/firewall"
"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 TestFirewall_AddRule(t *testing.T) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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, firewall.ProtoTCP, 1, 1, []string{}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
// 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, firewall.ProtoUDP, 1, 1, []string{"g1"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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, firewall.ProtoICMP, 1, 1, []string{}, "h1", netip.Prefix{}, netip.Prefix{}, "", ""))
assert.Nil(t, fw.InRules.ICMP[1].Any.Any)
assert.Empty(t, fw.InRules.ICMP[1].Any.Groups)
assert.Contains(t, fw.InRules.ICMP[1].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, netip.Prefix{}, "", ""))
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, netip.Prefix{}, "", ""))
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{}, "", netip.Prefix{}, ti, "", ""))
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{}, "", netip.Prefix{}, ti6, "", ""))
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, firewall.ProtoUDP, 1, 1, []string{"g1"}, "", netip.Prefix{}, netip.Prefix{}, "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, firewall.ProtoUDP, 1, 1, []string{"g1"}, "", netip.Prefix{}, netip.Prefix{}, "", "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", netip.Prefix{}, netip.Prefix{}, "", ""))
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, netip.Prefix{}, "", ""))
assert.True(t, fw.OutRules.AnyProto[0].Any.Any.Any)
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, netip.Prefix{}, "", ""))
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{}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
require.Error(t, fw.AddRule(true, firewall.ProtoAny, 10, 0, []string{}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
}
func TestFirewall_Drop(t *testing.T) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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: firewall.ProtoUDP,
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"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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"}, "", netip.Prefix{}, netip.Prefix{}, "", "signer-shasum"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "", "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"}, "", netip.Prefix{}, netip.Prefix{}, "", "signer-shasum-bad"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "", "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"}, "", netip.Prefix{}, netip.Prefix{}, "ca-good", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "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"}, "", netip.Prefix{}, netip.Prefix{}, "ca-good-bad", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "ca-good", ""))
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
}
func TestFirewall_DropV6(t *testing.T) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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: firewall.ProtoUDP,
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"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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"}, "", netip.Prefix{}, netip.Prefix{}, "", "signer-shasum"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "", "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"}, "", netip.Prefix{}, netip.Prefix{}, "", "signer-shasum-bad"))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "", "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"}, "", netip.Prefix{}, netip.Prefix{}, "ca-good", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "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"}, "", netip.Prefix{}, netip.Prefix{}, "ca-good-bad", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 0, 0, []string{"default-group"}, "", netip.Prefix{}, netip.Prefix{}, "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, netip.Prefix{}, "", "")
_ = ft.TCP.addRule(f, 100, 100, []string{"good-group"}, "good-host", netip.Prefix{}, pfix, "", "")
pfix6 := netip.MustParsePrefix("fd11::11/128")
_ = ft.TCP.addRule(f, 10, 10, []string{"good-group"}, "good-host", pfix6, netip.Prefix{}, "", "")
_ = ft.TCP.addRule(f, 100, 100, []string{"good-group"}, "good-host", netip.Prefix{}, pfix6, "", "")
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: firewall.ProtoUDP}, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, 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: firewall.ProtoTCP, LocalPort: 10}, true, c, cp)
}
})
}
func TestFirewall_Drop2(t *testing.T) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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: firewall.ProtoUDP,
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"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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: firewall.ProtoUDP,
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", netip.Prefix{}, netip.Prefix{}, "", ""))
require.NoError(t, fw.AddRule(true, firewall.ProtoAny, 1, 1, []string{}, "", netip.Prefix{}, netip.Prefix{}, "", "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{}, "", netip.MustParsePrefix("1.2.3.4/24"), netip.Prefix{}, "", ""))
require.NoError(t, fw.Drop(p, true, &h1, cp, nil))
}
func TestFirewall_Drop3V6(t *testing.T) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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: firewall.ProtoUDP,
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{}, "", netip.MustParsePrefix("fd12::34/120"), netip.Prefix{}, "", ""))
require.NoError(t, fw.Drop(p, true, &h, cp, nil))
}
func TestFirewall_DropConntrackReload(t *testing.T) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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: firewall.ProtoUDP,
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"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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_DropIPSpoofing(t *testing.T) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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{}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
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: firewall.ProtoUDP,
Fragment: false,
}
assert.Equal(t, fw.Drop(p, true, &h1, cp, nil), ErrInvalidRemoteIP)
}
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)
}
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)
require.NoError(t, err)
conf := config.NewC(l)
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(l)
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(l)
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(l)
conf.Settings["firewall"] = map[string]any{"outbound": []any{map[string]any{"code": "a", "host": "testh"}}}
_, 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"}}}
_, 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(l)
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(l)
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(l)
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(l)
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(l)
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: firewall.ProtoTCP, startPort: 1, endPort: 1, groups: nil, host: "a", ip: netip.Prefix{}, localIp: netip.Prefix{}}, mf.lastCall)
// Test adding udp rule
conf = config.NewC(l)
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: firewall.ProtoUDP, startPort: 1, endPort: 1, groups: nil, host: "a", ip: netip.Prefix{}, localIp: netip.Prefix{}}, mf.lastCall)
// Test adding icmp rule
conf = config.NewC(l)
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: firewall.ProtoICMP, startPort: 1, endPort: 1, groups: nil, host: "a", ip: netip.Prefix{}, localIp: netip.Prefix{}}, mf.lastCall)
// Test adding any rule
conf = config.NewC(l)
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: netip.Prefix{}, localIp: netip.Prefix{}}, mf.lastCall)
// Test adding rule with cidr
cidr := netip.MustParsePrefix("10.0.0.0/8")
conf = config.NewC(l)
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, localIp: netip.Prefix{}}, mf.lastCall)
// Test adding rule with local_cidr
conf = config.NewC(l)
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: netip.Prefix{}, localIp: cidr}, mf.lastCall)
// Test adding rule with cidr ipv6
cidr6 := netip.MustParsePrefix("fd00::/8")
conf = config.NewC(l)
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, localIp: netip.Prefix{}}, mf.lastCall)
// Test adding rule with local_cidr ipv6
conf = config.NewC(l)
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: netip.Prefix{}, localIp: cidr6}, mf.lastCall)
// Test adding rule with ca_sha
conf = config.NewC(l)
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: netip.Prefix{}, localIp: netip.Prefix{}, caSha: "12312313123"}, mf.lastCall)
// Test adding rule with ca_name
conf = config.NewC(l)
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: netip.Prefix{}, localIp: netip.Prefix{}, caName: "root01"}, mf.lastCall)
// Test single group
conf = config.NewC(l)
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: netip.Prefix{}, localIp: netip.Prefix{}}, mf.lastCall)
// Test single groups
conf = config.NewC(l)
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: netip.Prefix{}, localIp: netip.Prefix{}}, mf.lastCall)
// Test multiple AND groups
conf = config.NewC(l)
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: netip.Prefix{}, localIp: netip.Prefix{}}, mf.lastCall)
// Test Add error
conf = config.NewC(l)
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) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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(), "test rule #1; group was an array with a single value, converting to simple value")
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) {
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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: firewall.ProtoUDP,
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 *logrus.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 *logrus.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"}, "", netip.Prefix{}, netip.Prefix{}, "", ""))
return testsetup{
c: c,
fw: fw,
myVpnNetworksTable: myVpnNetworksTable,
}
}
func TestFirewall_Drop_EnforceIPMatch(t *testing.T) {
t.Parallel()
l := test.NewLogger()
ob := &bytes.Buffer{}
l.SetOutput(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"}, "", netip.Prefix{}, unsafePrefix, "", ""))
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 netip.Prefix
localIp netip.Prefix
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 netip.Prefix, localIp netip.Prefix, 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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