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JackDoan committed
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@@ -47,9 +47,10 @@ type rule struct {
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cidr netip.Prefix
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anyCIDR bool
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// localCIDRs are the local addresses the rule allows, anyLocalCIDR allows all of them.
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// localCIDR is the local addresses the rule allows, anyLocalCIDR allows all of them.
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// Neither is set for a rule without a local cidr until the Table is built and it gets the default.
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localCIDRs []netip.Prefix
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// localCIDR is shared by every localRules the rule is added to, so it's never changed, see localRules.add
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localCIDR *bart.Lite
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anyLocalCIDR bool
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}
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@@ -104,10 +105,17 @@ func (b *RulesBuilder) AddRule(incoming bool, proto uint8, startPort int32, endP
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// Build turns the rules into a Table for each direction, and hashes them. Rules without a local cidr allow
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// vpnNetworks when there are unsafe networks, otherwise any local address.
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func (b *RulesBuilder) Build(vpnNetworks, unsafeNetworks []netip.Prefix) Rules {
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anyLocal := len(unsafeNetworks) == 0 || b.defaultLocalCIDRAny
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var defaultLocal *bart.Lite
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if len(unsafeNetworks) > 0 && !b.defaultLocalCIDRAny {
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defaultLocal = new(bart.Lite)
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for _, network := range vpnNetworks {
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defaultLocal.Insert(network)
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}
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}
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return Rules{
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In: b.in.build(anyLocal, vpnNetworks),
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Out: b.out.build(anyLocal, vpnNetworks),
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In: b.in.build(defaultLocal),
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Out: b.out.build(defaultLocal),
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Hash: hex.EncodeToString(b.ruleSHA.Sum(nil)),
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HashFNV: b.ruleFNV.Sum32(),
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}
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@@ -139,7 +147,8 @@ func parseRule(startPort, endPort int32, groups []string, host, cidr, localCidr,
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return rule{}, fmt.Errorf("local_cidr did not parse; %w", err)
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}
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if localCIDR.IsValid() {
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r.localCIDRs = []netip.Prefix{localCIDR}
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r.localCIDR = new(bart.Lite)
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r.localCIDR.Insert(localCIDR)
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}
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return r, nil
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@@ -157,42 +166,44 @@ func (tr *tableRules) add(proto uint8, r rule) {
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}
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}
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// build turns the rules into a Table. Rules without a local cidr allow defaultLocalCIDRs,
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// or any local address when defaultLocalAny is set.
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func (tr *tableRules) build(defaultLocalAny bool, defaultLocalCIDRs []netip.Prefix) *Table {
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add := func(pr portRules, rules []rule) {
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for _, r := range rules {
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if !r.anyLocalCIDR && r.localCIDRs == nil {
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r.anyLocalCIDR, r.localCIDRs = defaultLocalAny, defaultLocalCIDRs
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}
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pr.add(r)
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}
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}
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var anyProto portRules
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if len(tr.anyRules) > 0 {
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anyProto = portRules{}
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add(anyProto, tr.anyRules)
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}
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// build turns the rules into a Table. Rules without a local cidr allow defaultLocal,
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// or any local address when defaultLocal is nil.
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func (tr *tableRules) build(defaultLocal *bart.Lite) *Table {
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t := &Table{}
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for proto := range t.protos {
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rules := tr.protoRules[proto]
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if len(rules) == 0 {
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t.protos[proto] = anyProto
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continue
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}
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pr := portRules{}
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add(pr, tr.anyRules)
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add(pr, rules)
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t.protos[proto] = pr
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// Every protocol starts out sharing the proto `any` rules, including protos[ProtoAny]
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anyProto := newPortRules(defaultLocal, tr.anyRules)
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for proto := range t.protos {
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t.protos[proto] = anyProto
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}
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// Protocols with rules of their own get a copy of the proto `any` rules too, so a packet only checks one set
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for proto, rules := range tr.protoRules {
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if len(rules) > 0 {
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t.protos[proto] = newPortRules(defaultLocal, tr.anyRules, rules)
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}
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}
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// ICMP and ICMPv6 share one set of rules, add keeps them together under ICMP
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t.protos[iputil.IPProtocolICMPv6] = t.protos[iputil.IPProtocolICMP]
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return t
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}
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// newPortRules builds portRules from each set of rules, or returns nil when there are none
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func newPortRules(defaultLocal *bart.Lite, ruleSets ...[]rule) portRules {
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var pr portRules
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for _, rules := range ruleSets {
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for _, r := range rules {
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if pr == nil {
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pr = portRules{}
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}
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pr.add(r.withDefaultLocal(defaultLocal))
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}
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}
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return pr
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}
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// parseCIDR parses a rule's cidr, which is empty, `any`, or a prefix
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func parseCIDR(s string) (prefix netip.Prefix, isAny bool, err error) {
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switch s {
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@@ -215,6 +226,16 @@ func (r rule) isAny() bool {
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return slices.Contains(r.groups, "any") || r.host == "any" || r.anyCIDR
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}
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// withDefaultLocal returns r allowing defaultLocal, or any local address when defaultLocal is nil,
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// unless r has a local cidr of its own
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func (r rule) withDefaultLocal(defaultLocal *bart.Lite) rule {
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if !r.anyLocalCIDR && r.localCIDR == nil {
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r.anyLocalCIDR = defaultLocal == nil
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r.localCIDR = defaultLocal
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}
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return r
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}
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func (pr portRules) add(r rule) {
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for i := r.startPort; i <= r.endPort; i++ {
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cr := pr[i]
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@@ -285,11 +306,13 @@ func (lr *localRules) add(r rule) {
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return
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}
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// Share the rule's local cidrs until another rule's need adding, then copy them instead of changing them
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if lr.LocalCIDR == nil {
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lr.LocalCIDR = new(bart.Lite)
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lr.LocalCIDR = r.localCIDR
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return
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}
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for _, prefix := range r.localCIDRs {
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lr.LocalCIDR.Insert(prefix)
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for prefix := range r.localCIDR.All() {
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lr.LocalCIDR = lr.LocalCIDR.InsertPersist(prefix)
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}
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}
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@@ -0,0 +1,220 @@
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package firewall
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import (
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"math"
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"net/netip"
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"testing"
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"github.com/slackhq/nebula/iputil"
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"github.com/slackhq/nebula/test"
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"github.com/stretchr/testify/assert"
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"github.com/stretchr/testify/require"
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)
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func TestRulesBuilder_AddRule(t *testing.T) {
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l := test.NewLogger()
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ti, err := netip.ParsePrefix("1.2.3.4/32")
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require.NoError(t, err)
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ti6, err := netip.ParsePrefix("fd12::34/128")
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require.NoError(t, err)
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rb := NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolTCP, 1, 1, []string{}, "", "", "", "", ""))
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rules := rb.Build(nil, nil)
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// An empty rule is any
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assert.True(t, rules.In.protos[iputil.IPProtocolTCP][1].Any.Any.Any)
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assert.Empty(t, rules.In.protos[iputil.IPProtocolTCP][1].Any.Groups)
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assert.Empty(t, rules.In.protos[iputil.IPProtocolTCP][1].Any.Hosts)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolUDP, 1, 1, []string{"g1"}, "", "", "", "", ""))
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rules = rb.Build(nil, nil)
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assert.Nil(t, rules.In.protos[iputil.IPProtocolUDP][1].Any.Any)
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assert.Contains(t, rules.In.protos[iputil.IPProtocolUDP][1].Any.Groups[0].Groups, "g1")
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assert.Empty(t, rules.In.protos[iputil.IPProtocolUDP][1].Any.Hosts)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolICMP, 1, 1, []string{}, "h1", "", "", "", ""))
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolICMPv6, 1, 1, []string{}, "h2", "", "", "", ""))
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rules = rb.Build(nil, nil)
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//no matter what port is given for icmp, it should end up as "any"
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assert.Nil(t, rules.In.protos[iputil.IPProtocolICMP][PortAny].Any.Any)
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assert.Empty(t, rules.In.protos[iputil.IPProtocolICMP][PortAny].Any.Groups)
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assert.Contains(t, rules.In.protos[iputil.IPProtocolICMP][PortAny].Any.Hosts, "h1")
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// ICMP and ICMPv6 share one set of rules
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assert.Contains(t, rules.In.protos[iputil.IPProtocolICMP][PortAny].Any.Hosts, "h2")
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assert.Contains(t, rules.In.protos[iputil.IPProtocolICMPv6][PortAny].Any.Hosts, "h1")
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// Any other protocol number gets its own rules
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, 47, 0, 0, []string{"g1"}, "", "", "", "", "")) // GRE
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rules = rb.Build(nil, nil)
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assert.Contains(t, rules.In.protos[47][PortAny].Any.Groups[0].Groups, "g1")
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assert.Nil(t, rules.In.protos[iputil.IPProtocolTCP])
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 1, 1, []string{}, "", ti.String(), "", "", ""))
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rules = rb.Build(nil, nil)
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assert.Nil(t, rules.Out.protos[ProtoAny][1].Any.Any)
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_, ok := rules.Out.protos[ProtoAny][1].Any.CIDR.Get(ti)
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assert.True(t, ok)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 1, 1, []string{}, "", ti6.String(), "", "", ""))
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rules = rb.Build(nil, nil)
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assert.Nil(t, rules.Out.protos[ProtoAny][1].Any.Any)
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_, ok = rules.Out.protos[ProtoAny][1].Any.CIDR.Get(ti6)
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assert.True(t, ok)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 1, 1, []string{}, "", "", ti.String(), "", ""))
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rules = rb.Build(nil, nil)
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assert.NotNil(t, rules.Out.protos[ProtoAny][1].Any.Any)
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ok = rules.Out.protos[ProtoAny][1].Any.Any.LocalCIDR.Get(ti)
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assert.True(t, ok)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 1, 1, []string{}, "", "", ti6.String(), "", ""))
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rules = rb.Build(nil, nil)
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assert.NotNil(t, rules.Out.protos[ProtoAny][1].Any.Any)
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ok = rules.Out.protos[ProtoAny][1].Any.Any.LocalCIDR.Get(ti6)
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assert.True(t, ok)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolUDP, 1, 1, []string{"g1"}, "", "", "", "ca-name", ""))
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rules = rb.Build(nil, nil)
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assert.Contains(t, rules.In.protos[iputil.IPProtocolUDP][1].CANames, "ca-name")
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolUDP, 1, 1, []string{"g1"}, "", "", "", "", "ca-sha"))
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rules = rb.Build(nil, nil)
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assert.Contains(t, rules.In.protos[iputil.IPProtocolUDP][1].CAShas, "ca-sha")
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 0, 0, []string{}, "any", "", "", "", ""))
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rules = rb.Build(nil, nil)
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assert.True(t, rules.Out.protos[ProtoAny][0].Any.Any.Any)
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rb = NewRulesBuilder(l)
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anyIp, err := netip.ParsePrefix("0.0.0.0/0")
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require.NoError(t, err)
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require.NoError(t, rb.AddRule(false, ProtoAny, 0, 0, []string{}, "", anyIp.String(), "", "", ""))
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rules = rb.Build(nil, nil)
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assert.Nil(t, rules.Out.protos[ProtoAny][0].Any.Any)
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table, ok := rules.Out.protos[ProtoAny][0].Any.CIDR.Lookup(netip.MustParseAddr("1.1.1.1"))
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assert.True(t, table.Any)
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table, ok = rules.Out.protos[ProtoAny][0].Any.CIDR.Lookup(netip.MustParseAddr("9::9"))
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assert.False(t, ok)
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rb = NewRulesBuilder(l)
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anyIp6, err := netip.ParsePrefix("::/0")
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require.NoError(t, err)
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require.NoError(t, rb.AddRule(false, ProtoAny, 0, 0, []string{}, "", anyIp6.String(), "", "", ""))
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rules = rb.Build(nil, nil)
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assert.Nil(t, rules.Out.protos[ProtoAny][0].Any.Any)
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table, ok = rules.Out.protos[ProtoAny][0].Any.CIDR.Lookup(netip.MustParseAddr("9::9"))
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assert.True(t, table.Any)
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table, ok = rules.Out.protos[ProtoAny][0].Any.CIDR.Lookup(netip.MustParseAddr("1.1.1.1"))
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assert.False(t, ok)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 0, 0, []string{}, "", "any", "", "", ""))
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rules = rb.Build(nil, nil)
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assert.True(t, rules.Out.protos[ProtoAny][0].Any.Any.Any)
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 0, 0, []string{}, "", "", anyIp.String(), "", ""))
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rules = rb.Build(nil, nil)
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assert.False(t, rules.Out.protos[ProtoAny][0].Any.Any.Any)
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assert.True(t, rules.Out.protos[ProtoAny][0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("1.1.1.1")))
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assert.False(t, rules.Out.protos[ProtoAny][0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("9::9")))
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 0, 0, []string{}, "", "", anyIp6.String(), "", ""))
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rules = rb.Build(nil, nil)
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assert.False(t, rules.Out.protos[ProtoAny][0].Any.Any.Any)
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assert.True(t, rules.Out.protos[ProtoAny][0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("9::9")))
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assert.False(t, rules.Out.protos[ProtoAny][0].Any.Any.LocalCIDR.Lookup(netip.MustParseAddr("1.1.1.1")))
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(false, ProtoAny, 0, 0, []string{}, "", "", "any", "", ""))
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rules = rb.Build(nil, nil)
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assert.True(t, rules.Out.protos[ProtoAny][0].Any.Any.Any)
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// Every protocol number is accepted
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, math.MaxUint8, 0, 0, []string{}, "", "", "", "", ""))
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rules = rb.Build(nil, nil)
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assert.True(t, rules.In.protos[math.MaxUint8][PortAny].Any.Any.Any)
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// Test error conditions, a bad rule is reported when it's added
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rb = NewRulesBuilder(l)
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require.Error(t, rb.AddRule(true, ProtoAny, 10, 0, []string{}, "", "", "", "", ""))
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require.Error(t, rb.AddRule(true, ProtoAny, 0, 0, []string{}, "", "junk", "", "", ""))
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require.Error(t, rb.AddRule(true, ProtoAny, 0, 0, []string{}, "", "", "junk", "", ""))
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// ICMP and ICMPv6 share one copy of each proto `any` rule
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rb = NewRulesBuilder(l)
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require.NoError(t, rb.AddRule(true, ProtoAny, PortAny, PortAny, []string{"default-group"}, "", "", "", "", ""))
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolICMPv6, PortAny, PortAny, []string{"nope"}, "", "", "", "", ""))
|
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rules = rb.Build(nil, nil)
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assert.Len(t, rules.In.protos[iputil.IPProtocolICMP][PortAny].Any.Groups, 2)
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assert.Len(t, rules.In.protos[iputil.IPProtocolICMPv6][PortAny].Any.Groups, 2)
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|
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// No rules allow nothing
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rules = NewRulesBuilder(l).Build(nil, nil)
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for proto := range rules.In.protos {
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assert.Nil(t, rules.In.protos[proto], "proto %d", proto)
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assert.Nil(t, rules.Out.protos[proto], "proto %d", proto)
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||||
}
|
||||
}
|
||||
|
||||
// TestRulesBuilder_sharedLocalCIDR ensures local cidrs shared between rules and ports are copied, not changed,
|
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// when another rule's local cidrs are added to them
|
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func TestRulesBuilder_sharedLocalCIDR(t *testing.T) {
|
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vpnNetworks := []netip.Prefix{netip.MustParsePrefix("10.1.0.5/16")}
|
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unsafeNetworks := []netip.Prefix{netip.MustParsePrefix("192.168.0.0/24")}
|
||||
vpnAddr := netip.MustParseAddr("10.1.9.9")
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unsafeAddr := netip.MustParseAddr("192.168.0.3")
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otherAddr := netip.MustParseAddr("172.16.0.1")
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||||
|
||||
rb := NewRulesBuilder(test.NewLogger())
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// h1 allows the vpn networks by default on ports 1 and 2, and 172.16.0.0/12 as well on port 1
|
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolTCP, 1, 2, nil, "h1", "", "", "", ""))
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolTCP, 1, 1, nil, "h1", "", "172.16.0.0/12", "", ""))
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// h2 allows 192.168.0.0/24 on ports 1 and 2, and the vpn networks by default as well on port 1
|
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolTCP, 1, 2, nil, "h2", "", "192.168.0.0/24", "", ""))
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require.NoError(t, rb.AddRule(true, iputil.IPProtocolTCP, 1, 1, nil, "h2", "", "", "", ""))
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||||
// h3 only has the default
|
||||
require.NoError(t, rb.AddRule(true, iputil.IPProtocolTCP, 3, 3, nil, "h3", "", "", "", ""))
|
||||
rules := rb.Build(vpnNetworks, unsafeNetworks)
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||||
|
||||
for _, tc := range []struct {
|
||||
port int32
|
||||
host string
|
||||
addr netip.Addr
|
||||
want bool
|
||||
}{
|
||||
{1, "h1", vpnAddr, true},
|
||||
{1, "h1", otherAddr, true},
|
||||
{1, "h1", unsafeAddr, false},
|
||||
{2, "h1", vpnAddr, true},
|
||||
{2, "h1", otherAddr, false},
|
||||
{1, "h2", unsafeAddr, true},
|
||||
{1, "h2", vpnAddr, true},
|
||||
{1, "h2", otherAddr, false},
|
||||
{2, "h2", unsafeAddr, true},
|
||||
{2, "h2", vpnAddr, false},
|
||||
{3, "h3", vpnAddr, true},
|
||||
{3, "h3", otherAddr, false},
|
||||
{3, "h3", unsafeAddr, false},
|
||||
} {
|
||||
lr := rules.In.protos[iputil.IPProtocolTCP][tc.port].Any.Hosts[tc.host]
|
||||
assert.Equal(t, tc.want, lr.match(&Packet{LocalAddr: tc.addr}, nil), "port %d, %s, %s", tc.port, tc.host, tc.addr)
|
||||
}
|
||||
}
|
||||
+1
-1
@@ -56,7 +56,7 @@ type groupsRule struct {
|
||||
|
||||
type localRules struct {
|
||||
Any bool
|
||||
// LocalCIDR is always set when Any isn't
|
||||
// LocalCIDR is always set when Any isn't. It's shared with other localRules, so it's never changed.
|
||||
LocalCIDR *bart.Lite
|
||||
}
|
||||
|
||||
|
||||
Reference in new issue
Block a user