[GLBC] Update firewall source ranges if outdated (#574)

check firewall rule source ranges

controllers/gce/controller/fakes.go

@@ -67,7 +67,7 @@ func NewFakeClusterManager(clusterName, firewallName string) *fakeClusterManager
 		testDefaultBeNodePort,
 		namer,
 	)
-	frPool := firewalls.NewFirewallPool(firewalls.NewFakeFirewallRules(), namer)
+	frPool := firewalls.NewFirewallPool(firewalls.NewFakeFirewallsProvider(namer), namer)
 	cm := &ClusterManager{
 		ClusterNamer: namer,
 		instancePool: nodePool,

controllers/gce/firewalls/fakes.go

@@ -18,6 +18,7 @@ package firewalls
 
 import (
 	"fmt"
+	"strconv"
 
 	compute "google.golang.org/api/compute/v1"
 	netset "k8s.io/kubernetes/pkg/util/net/sets"
@@ -25,81 +26,78 @@ import (
 	"k8s.io/ingress/controllers/gce/utils"
 )
 
-type fakeFirewallRules struct {
-	fw    []*compute.Firewall
-	namer utils.Namer
+type fakeFirewallsProvider struct {
+	fw    map[string]*compute.Firewall
+	namer *utils.Namer
 }
 
-func (f *fakeFirewallRules) GetFirewall(name string) (*compute.Firewall, error) {
-	for _, rule := range f.fw {
-		if rule.Name == name {
-			return rule, nil
-		}
+// NewFakeFirewallsProvider creates a fake for firewall rules.
+func NewFakeFirewallsProvider(namer *utils.Namer) *fakeFirewallsProvider {
+	return &fakeFirewallsProvider{
+		fw:    make(map[string]*compute.Firewall),
+		namer: namer,
 	}
-	return nil, fmt.Errorf("firewall rule %v not found", name)
 }
 
-func (f *fakeFirewallRules) CreateFirewall(name, msgTag string, srcRange netset.IPNet, ports []int64, hosts []string) error {
+func (f *fakeFirewallsProvider) GetFirewall(prefixedName string) (*compute.Firewall, error) {
+	rule, exists := f.fw[prefixedName]
+	if exists {
+		return rule, nil
+	}
+	return nil, utils.FakeGoogleAPINotFoundErr()
+}
+
+func (f *fakeFirewallsProvider) CreateFirewall(name, msgTag string, srcRange netset.IPNet, ports []int64, hosts []string) error {
+	prefixedName := f.namer.FrName(name)
 	strPorts := []string{}
 	for _, p := range ports {
-		strPorts = append(strPorts, fmt.Sprintf("%v", p))
+		strPorts = append(strPorts, strconv.FormatInt(p, 10))
 	}
-	f.fw = append(f.fw, &compute.Firewall{
+	if _, exists := f.fw[prefixedName]; exists {
+		return fmt.Errorf("firewall rule %v already exists", prefixedName)
+	}
+
+	f.fw[prefixedName] = &compute.Firewall{
 		// To accurately mimic the cloudprovider we need to add the k8s-fw
 		// prefix to the given rule name.
-		Name:         f.namer.FrName(name),
+		Name:         prefixedName,
 		SourceRanges: srcRange.StringSlice(),
 		Allowed:      []*compute.FirewallAllowed{{Ports: strPorts}},
-	})
+		TargetTags:   hosts, // WARNING: This is actually not correct, but good enough for testing this package
+	}
 	return nil
 }
 
-func (f *fakeFirewallRules) DeleteFirewall(name string) error {
-	firewalls := []*compute.Firewall{}
-	exists := false
+func (f *fakeFirewallsProvider) DeleteFirewall(name string) error {
 	// We need the full name for the same reason as CreateFirewall.
-	name = f.namer.FrName(name)
-	for _, rule := range f.fw {
-		if rule.Name == name {
-			exists = true
-			continue
-		}
-		firewalls = append(firewalls, rule)
-	}
+	prefixedName := f.namer.FrName(name)
+	_, exists := f.fw[prefixedName]
 	if !exists {
-		return fmt.Errorf("failed to find health check %v", name)
+		return utils.FakeGoogleAPINotFoundErr()
 	}
-	f.fw = firewalls
+
+	delete(f.fw, prefixedName)
 	return nil
 }
 
-func (f *fakeFirewallRules) UpdateFirewall(name, msgTag string, srcRange netset.IPNet, ports []int64, hosts []string) error {
-	var exists bool
+func (f *fakeFirewallsProvider) UpdateFirewall(name, msgTag string, srcRange netset.IPNet, ports []int64, hosts []string) error {
 	strPorts := []string{}
 	for _, p := range ports {
-		strPorts = append(strPorts, fmt.Sprintf("%v", p))
+		strPorts = append(strPorts, strconv.FormatInt(p, 10))
 	}
 
-	// To accurately mimic the cloudprovider we need to add the k8s-fw
-	// prefix to the given rule name.
-	name = f.namer.FrName(name)
-	for i := range f.fw {
-		if f.fw[i].Name == name {
-			exists = true
-			f.fw[i] = &compute.Firewall{
-				Name:         name,
-				SourceRanges: srcRange.StringSlice(),
-				Allowed:      []*compute.FirewallAllowed{{Ports: strPorts}},
-			}
-		}
+	// We need the full name for the same reason as CreateFirewall.
+	prefixedName := f.namer.FrName(name)
+	_, exists := f.fw[prefixedName]
+	if !exists {
+		return fmt.Errorf("update failed for rule %v, srcRange %v ports %v, rule not found", prefixedName, srcRange, ports)
 	}
-	if exists {
-		return nil
-	}
-	return fmt.Errorf("update failed for rule %v, srcRange %v ports %v, rule not found", name, srcRange, ports)
-}
 
-// NewFakeFirewallRules creates a fake for firewall rules.
-func NewFakeFirewallRules() *fakeFirewallRules {
-	return &fakeFirewallRules{fw: []*compute.Firewall{}, namer: utils.Namer{}}
+	f.fw[prefixedName] = &compute.Firewall{
+		Name:         name,
+		SourceRanges: srcRange.StringSlice(),
+		Allowed:      []*compute.FirewallAllowed{{Ports: strPorts}},
+		TargetTags:   hosts, // WARNING: This is actually not correct, but good enough for testing this package
+	}
+	return nil
 }

controllers/gce/firewalls/firewalls.go

@@ -75,17 +75,30 @@ func (fr *FirewallRules) Sync(nodePorts []int64, nodeNames []string) error {
 			existingPorts.Insert(p)
 		}
 	}
-	if requiredPorts.Equal(existingPorts) {
+
+	requiredCIDRs := sets.NewString(l7SrcRanges...)
+	existingCIDRs := sets.NewString(rule.SourceRanges...)
+
+	// Do not update if ports and source cidrs are not outdated.
+	// NOTE: We are not checking if nodeNames matches the firewall targetTags
+	if requiredPorts.Equal(existingPorts) && requiredCIDRs.Equal(existingCIDRs) {
+		glog.V(4).Info("Firewall does not need update of ports or source ranges")
 		return nil
 	}
-	glog.V(3).Infof("Firewall rule %v already exists, updating nodeports %v", name, nodePorts)
-	return fr.cloud.UpdateFirewall(suffix, "GCE L7 firewall rule", fr.srcRanges, nodePorts, nodeNames)
+
+	glog.V(3).Infof("Firewall %v already exists, updating nodeports %v", name, nodePorts)
+	return fr.cloud.UpdateFirewall(suffix, "GCE L7 firewall", fr.srcRanges, nodePorts, nodeNames)
 }
 
 // Shutdown shuts down this firewall rules manager.
 func (fr *FirewallRules) Shutdown() error {
-	glog.Infof("Deleting firewall rule with suffix %v", fr.namer.FrSuffix())
-	return fr.cloud.DeleteFirewall(fr.namer.FrSuffix())
+	glog.Infof("Deleting firewall with suffix %v", fr.namer.FrSuffix())
+	err := fr.cloud.DeleteFirewall(fr.namer.FrSuffix())
+	if err != nil && utils.IsHTTPErrorCode(err, 404) {
+		glog.Infof("Firewall with suffix %v didn't exist at Shutdown", fr.namer.FrSuffix())
+		return nil
+	}
+	return err
 }
 
 // GetFirewall just returns the firewall object corresponding to the given name.

controllers/gce/firewalls/firewalls_test.go

@@ -0,0 +1,110 @@
+/*
+Copyright 2015 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package firewalls
+
+import (
+	"strconv"
+	"testing"
+
+	"k8s.io/apimachinery/pkg/util/sets"
+	"k8s.io/ingress/controllers/gce/utils"
+	netset "k8s.io/kubernetes/pkg/util/net/sets"
+)
+
+const allCIDR = "0.0.0.0/0"
+
+func TestSyncFirewallPool(t *testing.T) {
+	namer := utils.NewNamer("ABC", "XYZ")
+	fwp := NewFakeFirewallsProvider(namer)
+	fp := NewFirewallPool(fwp, namer)
+	ruleName := namer.FrName(namer.FrSuffix())
+
+	// Test creating a firewall rule via Sync
+	nodePorts := []int64{80, 443, 3000}
+	nodes := []string{"node-a", "node-b", "node-c"}
+	err := fp.Sync(nodePorts, nodes)
+	if err != nil {
+		t.Errorf("unexpected err when syncing firewall, err: %v", err)
+	}
+	verifyFirewallRule(fwp, ruleName, nodePorts, nodes, l7SrcRanges, t)
+
+	// Sync to fewer ports
+	nodePorts = []int64{80, 443}
+	err = fp.Sync(nodePorts, nodes)
+	if err != nil {
+		t.Errorf("unexpected err when syncing firewall, err: %v", err)
+	}
+	verifyFirewallRule(fwp, ruleName, nodePorts, nodes, l7SrcRanges, t)
+
+	srcRanges, _ := netset.ParseIPNets(allCIDR)
+	err = fwp.UpdateFirewall(namer.FrSuffix(), "", srcRanges, nodePorts, nodes)
+	if err != nil {
+		t.Errorf("failed to update firewall rule, err: %v", err)
+	}
+	verifyFirewallRule(fwp, ruleName, nodePorts, nodes, []string{allCIDR}, t)
+
+	// Run Sync and expect l7 src ranges to be returned
+	err = fp.Sync(nodePorts, nodes)
+	if err != nil {
+		t.Errorf("unexpected err when syncing firewall, err: %v", err)
+	}
+	verifyFirewallRule(fwp, ruleName, nodePorts, nodes, l7SrcRanges, t)
+
+	// Add node and expect firewall to remain the same
+	// NOTE: See computeHostTag(..) in gce cloudprovider
+	nodes = []string{"node-a", "node-b", "node-c", "node-d"}
+	err = fp.Sync(nodePorts, nodes)
+	if err != nil {
+		t.Errorf("unexpected err when syncing firewall, err: %v", err)
+	}
+	verifyFirewallRule(fwp, ruleName, nodePorts, nodes, l7SrcRanges, t)
+
+	// Remove all ports and expect firewall rule to disappear
+	nodePorts = []int64{}
+	err = fp.Sync(nodePorts, nodes)
+	if err != nil {
+		t.Errorf("unexpected err when syncing firewall, err: %v", err)
+	}
+
+	err = fp.Shutdown()
+	if err != nil {
+		t.Errorf("unexpected err when deleting firewall, err: %v", err)
+	}
+}
+
+func verifyFirewallRule(fwp *fakeFirewallsProvider, ruleName string, expectedPorts []int64, expectedNodes, expectedCIDRs []string, t *testing.T) {
+	var strPorts []string
+	for _, v := range expectedPorts {
+		strPorts = append(strPorts, strconv.FormatInt(v, 10))
+	}
+
+	// Verify firewall rule was created
+	f, err := fwp.GetFirewall(ruleName)
+	if err != nil {
+		t.Errorf("could not retrieve firewall via cloud api, err %v", err)
+	}
+
+	// Verify firewall rule has correct ports
+	if !sets.NewString(f.Allowed[0].Ports...).Equal(sets.NewString(strPorts...)) {
+		t.Errorf("allowed ports doesn't equal expected ports, Actual: %v, Expected: %v", f.Allowed[0].Ports, strPorts)
+	}
+
+	// Verify firewall rule has correct CIDRs
+	if !sets.NewString(f.SourceRanges...).Equal(sets.NewString(expectedCIDRs...)) {
+		t.Errorf("source CIDRs doesn't equal expected CIDRs. Actual: %v, Expected: %v", f.SourceRanges, expectedCIDRs)
+	}
+}

controllers/gce/utils/utils.go

@@ -312,6 +312,11 @@ func (g GCEURLMap) PutDefaultBackend(d *compute.BackendService) {
 	}
 }
 
+// FakeNotFoundErr creates a NotFound error with type googleapi.Error
+func FakeGoogleAPINotFoundErr() *googleapi.Error {
+	return &googleapi.Error{Code: 404}
+}
+
 // IsHTTPErrorCode checks if the given error matches the given HTTP Error code.
 // For this to work the error must be a googleapi Error.
 func IsHTTPErrorCode(err error, code int) bool {