mirror of https://github.com/k3s-io/k3s
818 lines
33 KiB
Go
818 lines
33 KiB
Go
package netpol
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import (
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"crypto/sha256"
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"encoding/base32"
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"errors"
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"fmt"
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"strconv"
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"strings"
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"time"
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"github.com/cloudnativelabs/kube-router/pkg/metrics"
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"github.com/cloudnativelabs/kube-router/pkg/utils"
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"github.com/coreos/go-iptables/iptables"
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"github.com/golang/glog"
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api "k8s.io/api/core/v1"
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networking "k8s.io/api/networking/v1"
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v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/util/intstr"
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listers "k8s.io/client-go/listers/core/v1"
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"k8s.io/client-go/tools/cache"
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)
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func (npc *NetworkPolicyController) newNetworkPolicyEventHandler() cache.ResourceEventHandler {
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return cache.ResourceEventHandlerFuncs{
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AddFunc: func(obj interface{}) {
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npc.OnNetworkPolicyUpdate(obj)
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},
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UpdateFunc: func(oldObj, newObj interface{}) {
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npc.OnNetworkPolicyUpdate(newObj)
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},
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DeleteFunc: func(obj interface{}) {
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npc.handleNetworkPolicyDelete(obj)
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},
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}
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}
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// OnNetworkPolicyUpdate handles updates to network policy from the kubernetes api server
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func (npc *NetworkPolicyController) OnNetworkPolicyUpdate(obj interface{}) {
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netpol := obj.(*networking.NetworkPolicy)
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glog.V(2).Infof("Received update for network policy: %s/%s", netpol.Namespace, netpol.Name)
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npc.RequestFullSync()
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}
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func (npc *NetworkPolicyController) handleNetworkPolicyDelete(obj interface{}) {
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netpol, ok := obj.(*networking.NetworkPolicy)
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if !ok {
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tombstone, ok := obj.(cache.DeletedFinalStateUnknown)
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if !ok {
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glog.Errorf("unexpected object type: %v", obj)
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return
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}
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if netpol, ok = tombstone.Obj.(*networking.NetworkPolicy); !ok {
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glog.Errorf("unexpected object type: %v", obj)
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return
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}
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}
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glog.V(2).Infof("Received network policy: %s/%s delete event", netpol.Namespace, netpol.Name)
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npc.RequestFullSync()
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}
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// Configure iptables rules representing each network policy. All pod's matched by
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// network policy spec podselector labels are grouped together in one ipset which
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// is used for matching destination ip address. Each ingress rule in the network
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// policyspec is evaluated to set of matching pods, which are grouped in to a
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// ipset used for source ip addr matching.
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func (npc *NetworkPolicyController) syncNetworkPolicyChains(networkPoliciesInfo []networkPolicyInfo, version string) (map[string]bool, map[string]bool, error) {
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start := time.Now()
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defer func() {
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endTime := time.Since(start)
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metrics.ControllerPolicyChainsSyncTime.Observe(endTime.Seconds())
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glog.V(2).Infof("Syncing network policy chains took %v", endTime)
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}()
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activePolicyChains := make(map[string]bool)
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activePolicyIPSets := make(map[string]bool)
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iptablesCmdHandler, err := iptables.New()
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if err != nil {
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glog.Fatalf("Failed to initialize iptables executor due to: %s", err.Error())
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}
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// run through all network policies
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for _, policy := range networkPoliciesInfo {
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// ensure there is a unique chain per network policy in filter table
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policyChainName := networkPolicyChainName(policy.namespace, policy.name, version)
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err := iptablesCmdHandler.NewChain("filter", policyChainName)
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if err != nil && err.(*iptables.Error).ExitStatus() != 1 {
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return nil, nil, fmt.Errorf("Failed to run iptables command: %s", err.Error())
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}
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activePolicyChains[policyChainName] = true
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currnetPodIps := make([]string, 0, len(policy.targetPods))
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for ip := range policy.targetPods {
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currnetPodIps = append(currnetPodIps, ip)
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}
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if policy.policyType == "both" || policy.policyType == "ingress" {
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// create a ipset for all destination pod ip's matched by the policy spec PodSelector
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targetDestPodIPSetName := policyDestinationPodIPSetName(policy.namespace, policy.name)
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targetDestPodIPSet, err := npc.ipSetHandler.Create(targetDestPodIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return nil, nil, fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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err = targetDestPodIPSet.Refresh(currnetPodIps)
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if err != nil {
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glog.Errorf("failed to refresh targetDestPodIPSet,: " + err.Error())
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}
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err = npc.processIngressRules(policy, targetDestPodIPSetName, activePolicyIPSets, version)
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if err != nil {
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return nil, nil, err
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}
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activePolicyIPSets[targetDestPodIPSet.Name] = true
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}
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if policy.policyType == "both" || policy.policyType == "egress" {
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// create a ipset for all source pod ip's matched by the policy spec PodSelector
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targetSourcePodIPSetName := policySourcePodIPSetName(policy.namespace, policy.name)
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targetSourcePodIPSet, err := npc.ipSetHandler.Create(targetSourcePodIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return nil, nil, fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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err = targetSourcePodIPSet.Refresh(currnetPodIps)
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if err != nil {
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glog.Errorf("failed to refresh targetSourcePodIPSet: " + err.Error())
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}
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err = npc.processEgressRules(policy, targetSourcePodIPSetName, activePolicyIPSets, version)
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if err != nil {
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return nil, nil, err
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}
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activePolicyIPSets[targetSourcePodIPSet.Name] = true
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}
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}
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glog.V(2).Infof("Iptables chains in the filter table are synchronized with the network policies.")
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return activePolicyChains, activePolicyIPSets, nil
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}
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func (npc *NetworkPolicyController) processIngressRules(policy networkPolicyInfo,
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targetDestPodIPSetName string, activePolicyIPSets map[string]bool, version string) error {
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// From network policy spec: "If field 'Ingress' is empty then this NetworkPolicy does not allow any traffic "
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// so no whitelist rules to be added to the network policy
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if policy.ingressRules == nil {
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return nil
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}
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iptablesCmdHandler, err := iptables.New()
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if err != nil {
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return fmt.Errorf("Failed to initialize iptables executor due to: %s", err.Error())
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}
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policyChainName := networkPolicyChainName(policy.namespace, policy.name, version)
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// run through all the ingress rules in the spec and create iptables rules
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// in the chain for the network policy
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for i, ingressRule := range policy.ingressRules {
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if len(ingressRule.srcPods) != 0 {
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srcPodIPSetName := policyIndexedSourcePodIPSetName(policy.namespace, policy.name, i)
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srcPodIPSet, err := npc.ipSetHandler.Create(srcPodIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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activePolicyIPSets[srcPodIPSet.Name] = true
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ingressRuleSrcPodIPs := make([]string, 0, len(ingressRule.srcPods))
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for _, pod := range ingressRule.srcPods {
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ingressRuleSrcPodIPs = append(ingressRuleSrcPodIPs, pod.ip)
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}
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err = srcPodIPSet.Refresh(ingressRuleSrcPodIPs)
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if err != nil {
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glog.Errorf("failed to refresh srcPodIPSet: " + err.Error())
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}
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if len(ingressRule.ports) != 0 {
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// case where 'ports' details and 'from' details specified in the ingress rule
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// so match on specified source and destination ip's and specified port (if any) and protocol
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for _, portProtocol := range ingressRule.ports {
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comment := "rule to ACCEPT traffic from source pods to dest pods selected by policy name " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, srcPodIPSetName, targetDestPodIPSetName, portProtocol.protocol, portProtocol.port); err != nil {
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return err
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}
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}
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}
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if len(ingressRule.namedPorts) != 0 {
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for j, endPoints := range ingressRule.namedPorts {
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namedPortIPSetName := policyIndexedIngressNamedPortIPSetName(policy.namespace, policy.name, i, j)
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namedPortIPSet, err := npc.ipSetHandler.Create(namedPortIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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activePolicyIPSets[namedPortIPSet.Name] = true
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err = namedPortIPSet.Refresh(endPoints.ips)
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if err != nil {
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glog.Errorf("failed to refresh namedPortIPSet: " + err.Error())
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}
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comment := "rule to ACCEPT traffic from source pods to dest pods selected by policy name " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, srcPodIPSetName, namedPortIPSetName, endPoints.protocol, endPoints.port); err != nil {
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return err
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}
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}
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}
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if len(ingressRule.ports) == 0 && len(ingressRule.namedPorts) == 0 {
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// case where no 'ports' details specified in the ingress rule but 'from' details specified
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// so match on specified source and destination ip with all port and protocol
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comment := "rule to ACCEPT traffic from source pods to dest pods selected by policy name " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, srcPodIPSetName, targetDestPodIPSetName, "", ""); err != nil {
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return err
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}
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}
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}
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// case where only 'ports' details specified but no 'from' details in the ingress rule
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// so match on all sources, with specified port (if any) and protocol
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if ingressRule.matchAllSource && !ingressRule.matchAllPorts {
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for _, portProtocol := range ingressRule.ports {
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comment := "rule to ACCEPT traffic from all sources to dest pods selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, "", targetDestPodIPSetName, portProtocol.protocol, portProtocol.port); err != nil {
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return err
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}
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}
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for j, endPoints := range ingressRule.namedPorts {
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namedPortIPSetName := policyIndexedIngressNamedPortIPSetName(policy.namespace, policy.name, i, j)
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namedPortIPSet, err := npc.ipSetHandler.Create(namedPortIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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activePolicyIPSets[namedPortIPSet.Name] = true
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err = namedPortIPSet.Refresh(endPoints.ips)
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if err != nil {
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glog.Errorf("failed to refresh namedPortIPSet: " + err.Error())
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}
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comment := "rule to ACCEPT traffic from all sources to dest pods selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, "", namedPortIPSetName, endPoints.protocol, endPoints.port); err != nil {
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return err
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}
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}
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}
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// case where nether ports nor from details are speified in the ingress rule
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// so match on all ports, protocol, source IP's
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if ingressRule.matchAllSource && ingressRule.matchAllPorts {
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comment := "rule to ACCEPT traffic from all sources to dest pods selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, "", targetDestPodIPSetName, "", ""); err != nil {
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return err
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}
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}
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if len(ingressRule.srcIPBlocks) != 0 {
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srcIPBlockIPSetName := policyIndexedSourceIPBlockIPSetName(policy.namespace, policy.name, i)
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srcIPBlockIPSet, err := npc.ipSetHandler.Create(srcIPBlockIPSetName, utils.TypeHashNet, utils.OptionTimeout, "0")
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if err != nil {
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return fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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activePolicyIPSets[srcIPBlockIPSet.Name] = true
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err = srcIPBlockIPSet.RefreshWithBuiltinOptions(ingressRule.srcIPBlocks)
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if err != nil {
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glog.Errorf("failed to refresh srcIPBlockIPSet: " + err.Error())
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}
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if !ingressRule.matchAllPorts {
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for _, portProtocol := range ingressRule.ports {
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comment := "rule to ACCEPT traffic from specified ipBlocks to dest pods selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, srcIPBlockIPSetName, targetDestPodIPSetName, portProtocol.protocol, portProtocol.port); err != nil {
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return err
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}
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}
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for j, endPoints := range ingressRule.namedPorts {
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namedPortIPSetName := policyIndexedIngressNamedPortIPSetName(policy.namespace, policy.name, i, j)
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namedPortIPSet, err := npc.ipSetHandler.Create(namedPortIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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activePolicyIPSets[namedPortIPSet.Name] = true
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err = namedPortIPSet.Refresh(endPoints.ips)
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if err != nil {
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glog.Errorf("failed to refresh namedPortIPSet: " + err.Error())
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}
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comment := "rule to ACCEPT traffic from specified ipBlocks to dest pods selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, srcIPBlockIPSetName, namedPortIPSetName, endPoints.protocol, endPoints.port); err != nil {
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return err
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}
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}
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}
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if ingressRule.matchAllPorts {
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comment := "rule to ACCEPT traffic from specified ipBlocks to dest pods selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, srcIPBlockIPSetName, targetDestPodIPSetName, "", ""); err != nil {
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return err
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}
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}
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}
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}
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return nil
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}
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func (npc *NetworkPolicyController) processEgressRules(policy networkPolicyInfo,
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targetSourcePodIPSetName string, activePolicyIPSets map[string]bool, version string) error {
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// From network policy spec: "If field 'Ingress' is empty then this NetworkPolicy does not allow any traffic "
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// so no whitelist rules to be added to the network policy
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if policy.egressRules == nil {
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return nil
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}
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iptablesCmdHandler, err := iptables.New()
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if err != nil {
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return fmt.Errorf("Failed to initialize iptables executor due to: %s", err.Error())
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}
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policyChainName := networkPolicyChainName(policy.namespace, policy.name, version)
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// run through all the egress rules in the spec and create iptables rules
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// in the chain for the network policy
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for i, egressRule := range policy.egressRules {
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if len(egressRule.dstPods) != 0 {
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dstPodIPSetName := policyIndexedDestinationPodIPSetName(policy.namespace, policy.name, i)
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dstPodIPSet, err := npc.ipSetHandler.Create(dstPodIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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activePolicyIPSets[dstPodIPSet.Name] = true
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egressRuleDstPodIps := make([]string, 0, len(egressRule.dstPods))
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for _, pod := range egressRule.dstPods {
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egressRuleDstPodIps = append(egressRuleDstPodIps, pod.ip)
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}
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err = dstPodIPSet.Refresh(egressRuleDstPodIps)
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if err != nil {
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glog.Errorf("failed to refresh dstPodIPSet: " + err.Error())
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}
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if len(egressRule.ports) != 0 {
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// case where 'ports' details and 'from' details specified in the egress rule
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// so match on specified source and destination ip's and specified port (if any) and protocol
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for _, portProtocol := range egressRule.ports {
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comment := "rule to ACCEPT traffic from source pods to dest pods selected by policy name " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, targetSourcePodIPSetName, dstPodIPSetName, portProtocol.protocol, portProtocol.port); err != nil {
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return err
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}
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}
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}
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if len(egressRule.namedPorts) != 0 {
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for j, endPoints := range egressRule.namedPorts {
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namedPortIPSetName := policyIndexedEgressNamedPortIPSetName(policy.namespace, policy.name, i, j)
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namedPortIPSet, err := npc.ipSetHandler.Create(namedPortIPSetName, utils.TypeHashIP, utils.OptionTimeout, "0")
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if err != nil {
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return fmt.Errorf("failed to create ipset: %s", err.Error())
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}
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activePolicyIPSets[namedPortIPSet.Name] = true
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err = namedPortIPSet.Refresh(endPoints.ips)
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if err != nil {
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glog.Errorf("failed to refresh namedPortIPSet: " + err.Error())
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}
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comment := "rule to ACCEPT traffic from source pods to dest pods selected by policy name " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, targetSourcePodIPSetName, namedPortIPSetName, endPoints.protocol, endPoints.port); err != nil {
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return err
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}
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}
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}
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if len(egressRule.ports) == 0 && len(egressRule.namedPorts) == 0 {
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// case where no 'ports' details specified in the ingress rule but 'from' details specified
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// so match on specified source and destination ip with all port and protocol
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comment := "rule to ACCEPT traffic from source pods to dest pods selected by policy name " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, targetSourcePodIPSetName, dstPodIPSetName, "", ""); err != nil {
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return err
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}
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}
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}
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// case where only 'ports' details specified but no 'to' details in the egress rule
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// so match on all sources, with specified port (if any) and protocol
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if egressRule.matchAllDestinations && !egressRule.matchAllPorts {
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for _, portProtocol := range egressRule.ports {
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comment := "rule to ACCEPT traffic from source pods to all destinations selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, targetSourcePodIPSetName, "", portProtocol.protocol, portProtocol.port); err != nil {
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return err
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}
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}
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}
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// case where nether ports nor from details are speified in the egress rule
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// so match on all ports, protocol, source IP's
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if egressRule.matchAllDestinations && egressRule.matchAllPorts {
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comment := "rule to ACCEPT traffic from source pods to all destinations selected by policy name: " +
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policy.name + " namespace " + policy.namespace
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if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, targetSourcePodIPSetName, "", "", ""); err != nil {
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return err
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}
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}
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if len(egressRule.dstIPBlocks) != 0 {
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dstIPBlockIPSetName := policyIndexedDestinationIPBlockIPSetName(policy.namespace, policy.name, i)
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|
dstIPBlockIPSet, err := npc.ipSetHandler.Create(dstIPBlockIPSetName, utils.TypeHashNet, utils.OptionTimeout, "0")
|
|
if err != nil {
|
|
return fmt.Errorf("failed to create ipset: %s", err.Error())
|
|
}
|
|
activePolicyIPSets[dstIPBlockIPSet.Name] = true
|
|
err = dstIPBlockIPSet.RefreshWithBuiltinOptions(egressRule.dstIPBlocks)
|
|
if err != nil {
|
|
glog.Errorf("failed to refresh dstIPBlockIPSet: " + err.Error())
|
|
}
|
|
if !egressRule.matchAllPorts {
|
|
for _, portProtocol := range egressRule.ports {
|
|
comment := "rule to ACCEPT traffic from source pods to specified ipBlocks selected by policy name: " +
|
|
policy.name + " namespace " + policy.namespace
|
|
if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, targetSourcePodIPSetName, dstIPBlockIPSetName, portProtocol.protocol, portProtocol.port); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
if egressRule.matchAllPorts {
|
|
comment := "rule to ACCEPT traffic from source pods to specified ipBlocks selected by policy name: " +
|
|
policy.name + " namespace " + policy.namespace
|
|
if err := npc.appendRuleToPolicyChain(iptablesCmdHandler, policyChainName, comment, targetSourcePodIPSetName, dstIPBlockIPSetName, "", ""); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) appendRuleToPolicyChain(iptablesCmdHandler *iptables.IPTables, policyChainName, comment, srcIPSetName, dstIPSetName, protocol, dPort string) error {
|
|
if iptablesCmdHandler == nil {
|
|
return fmt.Errorf("Failed to run iptables command: iptablesCmdHandler is nil")
|
|
}
|
|
args := make([]string, 0)
|
|
if comment != "" {
|
|
args = append(args, "-m", "comment", "--comment", comment)
|
|
}
|
|
if srcIPSetName != "" {
|
|
args = append(args, "-m", "set", "--match-set", srcIPSetName, "src")
|
|
}
|
|
if dstIPSetName != "" {
|
|
args = append(args, "-m", "set", "--match-set", dstIPSetName, "dst")
|
|
}
|
|
if protocol != "" {
|
|
args = append(args, "-p", protocol)
|
|
}
|
|
if dPort != "" {
|
|
args = append(args, "--dport", dPort)
|
|
}
|
|
|
|
markComment := "rule to mark traffic matching a network policy"
|
|
markArgs := append(args, "-j", "MARK", "-m", "comment", "--comment", markComment, "--set-xmark", "0x10000/0x10000")
|
|
err := iptablesCmdHandler.AppendUnique("filter", policyChainName, markArgs...)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to run iptables command: %s", err.Error())
|
|
}
|
|
|
|
returnComment := "rule to RETURN traffic matching a network policy"
|
|
returnArgs := append(args, "-m", "comment", "--comment", returnComment, "-m", "mark", "--mark", "0x10000/0x10000", "-j", "RETURN")
|
|
err = iptablesCmdHandler.AppendUnique("filter", policyChainName, returnArgs...)
|
|
if err != nil {
|
|
return fmt.Errorf("Failed to run iptables command: %s", err.Error())
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) buildNetworkPoliciesInfo() ([]networkPolicyInfo, error) {
|
|
|
|
NetworkPolicies := make([]networkPolicyInfo, 0)
|
|
|
|
for _, policyObj := range npc.npLister.List() {
|
|
|
|
policy, ok := policyObj.(*networking.NetworkPolicy)
|
|
podSelector, _ := v1.LabelSelectorAsSelector(&policy.Spec.PodSelector)
|
|
if !ok {
|
|
return nil, fmt.Errorf("Failed to convert")
|
|
}
|
|
newPolicy := networkPolicyInfo{
|
|
name: policy.Name,
|
|
namespace: policy.Namespace,
|
|
podSelector: podSelector,
|
|
policyType: "ingress",
|
|
}
|
|
|
|
ingressType, egressType := false, false
|
|
for _, policyType := range policy.Spec.PolicyTypes {
|
|
if policyType == networking.PolicyTypeIngress {
|
|
ingressType = true
|
|
}
|
|
if policyType == networking.PolicyTypeEgress {
|
|
egressType = true
|
|
}
|
|
}
|
|
if ingressType && egressType {
|
|
newPolicy.policyType = "both"
|
|
} else if egressType {
|
|
newPolicy.policyType = "egress"
|
|
} else if ingressType {
|
|
newPolicy.policyType = "ingress"
|
|
}
|
|
|
|
matchingPods, err := npc.ListPodsByNamespaceAndLabels(policy.Namespace, podSelector)
|
|
newPolicy.targetPods = make(map[string]podInfo)
|
|
namedPort2IngressEps := make(namedPort2eps)
|
|
if err == nil {
|
|
for _, matchingPod := range matchingPods {
|
|
if matchingPod.Status.PodIP == "" {
|
|
continue
|
|
}
|
|
newPolicy.targetPods[matchingPod.Status.PodIP] = podInfo{ip: matchingPod.Status.PodIP,
|
|
name: matchingPod.ObjectMeta.Name,
|
|
namespace: matchingPod.ObjectMeta.Namespace,
|
|
labels: matchingPod.ObjectMeta.Labels}
|
|
npc.grabNamedPortFromPod(matchingPod, &namedPort2IngressEps)
|
|
}
|
|
}
|
|
|
|
if policy.Spec.Ingress == nil {
|
|
newPolicy.ingressRules = nil
|
|
} else {
|
|
newPolicy.ingressRules = make([]ingressRule, 0)
|
|
}
|
|
|
|
if policy.Spec.Egress == nil {
|
|
newPolicy.egressRules = nil
|
|
} else {
|
|
newPolicy.egressRules = make([]egressRule, 0)
|
|
}
|
|
|
|
for _, specIngressRule := range policy.Spec.Ingress {
|
|
ingressRule := ingressRule{}
|
|
ingressRule.srcPods = make([]podInfo, 0)
|
|
ingressRule.srcIPBlocks = make([][]string, 0)
|
|
|
|
// If this field is empty or missing in the spec, this rule matches all sources
|
|
if len(specIngressRule.From) == 0 {
|
|
ingressRule.matchAllSource = true
|
|
} else {
|
|
ingressRule.matchAllSource = false
|
|
for _, peer := range specIngressRule.From {
|
|
if peerPods, err := npc.evalPodPeer(policy, peer); err == nil {
|
|
for _, peerPod := range peerPods {
|
|
if peerPod.Status.PodIP == "" {
|
|
continue
|
|
}
|
|
ingressRule.srcPods = append(ingressRule.srcPods,
|
|
podInfo{ip: peerPod.Status.PodIP,
|
|
name: peerPod.ObjectMeta.Name,
|
|
namespace: peerPod.ObjectMeta.Namespace,
|
|
labels: peerPod.ObjectMeta.Labels})
|
|
}
|
|
}
|
|
ingressRule.srcIPBlocks = append(ingressRule.srcIPBlocks, npc.evalIPBlockPeer(peer)...)
|
|
}
|
|
}
|
|
|
|
ingressRule.ports = make([]protocolAndPort, 0)
|
|
ingressRule.namedPorts = make([]endPoints, 0)
|
|
// If this field is empty or missing in the spec, this rule matches all ports
|
|
if len(specIngressRule.Ports) == 0 {
|
|
ingressRule.matchAllPorts = true
|
|
} else {
|
|
ingressRule.matchAllPorts = false
|
|
ingressRule.ports, ingressRule.namedPorts = npc.processNetworkPolicyPorts(specIngressRule.Ports, namedPort2IngressEps)
|
|
}
|
|
|
|
newPolicy.ingressRules = append(newPolicy.ingressRules, ingressRule)
|
|
}
|
|
|
|
for _, specEgressRule := range policy.Spec.Egress {
|
|
egressRule := egressRule{}
|
|
egressRule.dstPods = make([]podInfo, 0)
|
|
egressRule.dstIPBlocks = make([][]string, 0)
|
|
namedPort2EgressEps := make(namedPort2eps)
|
|
|
|
// If this field is empty or missing in the spec, this rule matches all sources
|
|
if len(specEgressRule.To) == 0 {
|
|
egressRule.matchAllDestinations = true
|
|
} else {
|
|
egressRule.matchAllDestinations = false
|
|
for _, peer := range specEgressRule.To {
|
|
if peerPods, err := npc.evalPodPeer(policy, peer); err == nil {
|
|
for _, peerPod := range peerPods {
|
|
if peerPod.Status.PodIP == "" {
|
|
continue
|
|
}
|
|
egressRule.dstPods = append(egressRule.dstPods,
|
|
podInfo{ip: peerPod.Status.PodIP,
|
|
name: peerPod.ObjectMeta.Name,
|
|
namespace: peerPod.ObjectMeta.Namespace,
|
|
labels: peerPod.ObjectMeta.Labels})
|
|
npc.grabNamedPortFromPod(peerPod, &namedPort2EgressEps)
|
|
}
|
|
|
|
}
|
|
egressRule.dstIPBlocks = append(egressRule.dstIPBlocks, npc.evalIPBlockPeer(peer)...)
|
|
}
|
|
}
|
|
|
|
egressRule.ports = make([]protocolAndPort, 0)
|
|
egressRule.namedPorts = make([]endPoints, 0)
|
|
// If this field is empty or missing in the spec, this rule matches all ports
|
|
if len(specEgressRule.Ports) == 0 {
|
|
egressRule.matchAllPorts = true
|
|
} else {
|
|
egressRule.matchAllPorts = false
|
|
egressRule.ports, egressRule.namedPorts = npc.processNetworkPolicyPorts(specEgressRule.Ports, namedPort2EgressEps)
|
|
}
|
|
|
|
newPolicy.egressRules = append(newPolicy.egressRules, egressRule)
|
|
}
|
|
NetworkPolicies = append(NetworkPolicies, newPolicy)
|
|
}
|
|
|
|
return NetworkPolicies, nil
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) evalPodPeer(policy *networking.NetworkPolicy, peer networking.NetworkPolicyPeer) ([]*api.Pod, error) {
|
|
|
|
var matchingPods []*api.Pod
|
|
matchingPods = make([]*api.Pod, 0)
|
|
var err error
|
|
// spec can have both PodSelector AND NamespaceSelector
|
|
if peer.NamespaceSelector != nil {
|
|
namespaceSelector, _ := v1.LabelSelectorAsSelector(peer.NamespaceSelector)
|
|
namespaces, err := npc.ListNamespaceByLabels(namespaceSelector)
|
|
if err != nil {
|
|
return nil, errors.New("Failed to build network policies info due to " + err.Error())
|
|
}
|
|
|
|
podSelector := labels.Everything()
|
|
if peer.PodSelector != nil {
|
|
podSelector, _ = v1.LabelSelectorAsSelector(peer.PodSelector)
|
|
}
|
|
for _, namespace := range namespaces {
|
|
namespacePods, err := npc.ListPodsByNamespaceAndLabels(namespace.Name, podSelector)
|
|
if err != nil {
|
|
return nil, errors.New("Failed to build network policies info due to " + err.Error())
|
|
}
|
|
matchingPods = append(matchingPods, namespacePods...)
|
|
}
|
|
} else if peer.PodSelector != nil {
|
|
podSelector, _ := v1.LabelSelectorAsSelector(peer.PodSelector)
|
|
matchingPods, err = npc.ListPodsByNamespaceAndLabels(policy.Namespace, podSelector)
|
|
}
|
|
|
|
return matchingPods, err
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) processNetworkPolicyPorts(npPorts []networking.NetworkPolicyPort, namedPort2eps namedPort2eps) (numericPorts []protocolAndPort, namedPorts []endPoints) {
|
|
numericPorts, namedPorts = make([]protocolAndPort, 0), make([]endPoints, 0)
|
|
for _, npPort := range npPorts {
|
|
if npPort.Port == nil {
|
|
numericPorts = append(numericPorts, protocolAndPort{port: "", protocol: string(*npPort.Protocol)})
|
|
} else if npPort.Port.Type == intstr.Int {
|
|
numericPorts = append(numericPorts, protocolAndPort{port: npPort.Port.String(), protocol: string(*npPort.Protocol)})
|
|
} else {
|
|
if protocol2eps, ok := namedPort2eps[npPort.Port.String()]; ok {
|
|
if numericPort2eps, ok := protocol2eps[string(*npPort.Protocol)]; ok {
|
|
for _, eps := range numericPort2eps {
|
|
namedPorts = append(namedPorts, *eps)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) ListPodsByNamespaceAndLabels(namespace string, podSelector labels.Selector) (ret []*api.Pod, err error) {
|
|
podLister := listers.NewPodLister(npc.podLister)
|
|
allMatchedNameSpacePods, err := podLister.Pods(namespace).List(podSelector)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return allMatchedNameSpacePods, nil
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) ListNamespaceByLabels(namespaceSelector labels.Selector) ([]*api.Namespace, error) {
|
|
namespaceLister := listers.NewNamespaceLister(npc.nsLister)
|
|
matchedNamespaces, err := namespaceLister.List(namespaceSelector)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return matchedNamespaces, nil
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) evalIPBlockPeer(peer networking.NetworkPolicyPeer) [][]string {
|
|
ipBlock := make([][]string, 0)
|
|
if peer.PodSelector == nil && peer.NamespaceSelector == nil && peer.IPBlock != nil {
|
|
if cidr := peer.IPBlock.CIDR; strings.HasSuffix(cidr, "/0") {
|
|
ipBlock = append(ipBlock, []string{"0.0.0.0/1", utils.OptionTimeout, "0"}, []string{"128.0.0.0/1", utils.OptionTimeout, "0"})
|
|
} else {
|
|
ipBlock = append(ipBlock, []string{cidr, utils.OptionTimeout, "0"})
|
|
}
|
|
for _, except := range peer.IPBlock.Except {
|
|
if strings.HasSuffix(except, "/0") {
|
|
ipBlock = append(ipBlock, []string{"0.0.0.0/1", utils.OptionTimeout, "0", utils.OptionNoMatch}, []string{"128.0.0.0/1", utils.OptionTimeout, "0", utils.OptionNoMatch})
|
|
} else {
|
|
ipBlock = append(ipBlock, []string{except, utils.OptionTimeout, "0", utils.OptionNoMatch})
|
|
}
|
|
}
|
|
}
|
|
return ipBlock
|
|
}
|
|
|
|
func (npc *NetworkPolicyController) grabNamedPortFromPod(pod *api.Pod, namedPort2eps *namedPort2eps) {
|
|
if pod == nil || namedPort2eps == nil {
|
|
return
|
|
}
|
|
for k := range pod.Spec.Containers {
|
|
for _, port := range pod.Spec.Containers[k].Ports {
|
|
name := port.Name
|
|
protocol := string(port.Protocol)
|
|
containerPort := strconv.Itoa(int(port.ContainerPort))
|
|
|
|
if (*namedPort2eps)[name] == nil {
|
|
(*namedPort2eps)[name] = make(protocol2eps)
|
|
}
|
|
if (*namedPort2eps)[name][protocol] == nil {
|
|
(*namedPort2eps)[name][protocol] = make(numericPort2eps)
|
|
}
|
|
if eps, ok := (*namedPort2eps)[name][protocol][containerPort]; !ok {
|
|
(*namedPort2eps)[name][protocol][containerPort] = &endPoints{
|
|
ips: []string{pod.Status.PodIP},
|
|
protocolAndPort: protocolAndPort{port: containerPort, protocol: protocol},
|
|
}
|
|
} else {
|
|
eps.ips = append(eps.ips, pod.Status.PodIP)
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
func networkPolicyChainName(namespace, policyName string, version string) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName + version))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeNetworkPolicyChainPrefix + encoded[:16]
|
|
}
|
|
|
|
func policySourcePodIPSetName(namespace, policyName string) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeSourceIPSetPrefix + encoded[:16]
|
|
}
|
|
|
|
func policyDestinationPodIPSetName(namespace, policyName string) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeDestinationIPSetPrefix + encoded[:16]
|
|
}
|
|
|
|
func policyIndexedSourcePodIPSetName(namespace, policyName string, ingressRuleNo int) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName + "ingressrule" + strconv.Itoa(ingressRuleNo) + "pod"))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeSourceIPSetPrefix + encoded[:16]
|
|
}
|
|
|
|
func policyIndexedDestinationPodIPSetName(namespace, policyName string, egressRuleNo int) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName + "egressrule" + strconv.Itoa(egressRuleNo) + "pod"))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeDestinationIPSetPrefix + encoded[:16]
|
|
}
|
|
|
|
func policyIndexedSourceIPBlockIPSetName(namespace, policyName string, ingressRuleNo int) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName + "ingressrule" + strconv.Itoa(ingressRuleNo) + "ipblock"))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeSourceIPSetPrefix + encoded[:16]
|
|
}
|
|
|
|
func policyIndexedDestinationIPBlockIPSetName(namespace, policyName string, egressRuleNo int) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName + "egressrule" + strconv.Itoa(egressRuleNo) + "ipblock"))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeDestinationIPSetPrefix + encoded[:16]
|
|
}
|
|
|
|
func policyIndexedIngressNamedPortIPSetName(namespace, policyName string, ingressRuleNo, namedPortNo int) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName + "ingressrule" + strconv.Itoa(ingressRuleNo) + strconv.Itoa(namedPortNo) + "namedport"))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeDestinationIPSetPrefix + encoded[:16]
|
|
}
|
|
|
|
func policyIndexedEgressNamedPortIPSetName(namespace, policyName string, egressRuleNo, namedPortNo int) string {
|
|
hash := sha256.Sum256([]byte(namespace + policyName + "egressrule" + strconv.Itoa(egressRuleNo) + strconv.Itoa(namedPortNo) + "namedport"))
|
|
encoded := base32.StdEncoding.EncodeToString(hash[:])
|
|
return kubeDestinationIPSetPrefix + encoded[:16]
|
|
}
|