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translatePolicy.go
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translatePolicy.go
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// Copyright 2018 Microsoft. All rights reserved.
// MIT License
package npm
import (
"strconv"
"github.com/Azure/azure-container-networking/log"
"github.com/Azure/azure-container-networking/npm/iptm"
"github.com/Azure/azure-container-networking/npm/util"
networkingv1 "k8s.io/api/networking/v1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
type portsInfo struct {
protocol string
port string
}
func craftPartialIptEntrySpecFromPort(portRule networkingv1.NetworkPolicyPort, sPortOrDPortFlag string) []string {
partialSpec := []string{}
if portRule.Protocol != nil {
partialSpec = append(
partialSpec,
util.IptablesProtFlag,
string(*portRule.Protocol),
)
}
if portRule.Port != nil {
partialSpec = append(
partialSpec,
sPortOrDPortFlag,
portRule.Port.String(),
)
}
return partialSpec
}
func getPortType(portRule networkingv1.NetworkPolicyPort) string {
if portRule.Port == nil || portRule.Port.IntValue() != 0 {
return "validport"
} else if portRule.Port.IntValue() == 0 && portRule.Port.String() != "" {
return "namedport"
}
return "invalid"
}
func craftPartialIptablesCommentFromPort(portRule networkingv1.NetworkPolicyPort, sPortOrDPortFlag string) string {
partialComment := ""
if portRule.Protocol != nil {
partialComment += string(*portRule.Protocol)
if portRule.Port != nil {
partialComment += "-"
}
}
if portRule.Port != nil {
partialComment += "PORT-"
partialComment += portRule.Port.String()
}
return partialComment
}
func craftPartialIptEntrySpecFromOpAndLabel(op, label, srcOrDstFlag string, isNamespaceSelector bool) []string {
if isNamespaceSelector {
label = "ns-" + label
}
partialSpec := []string{
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
op,
util.IptablesMatchSetFlag,
util.GetHashedName(label),
srcOrDstFlag,
}
return util.DropEmptyFields(partialSpec)
}
// craftPartialIptablesCommentFromSelector :- ns must be "" for namespace selectors
func craftPartialIptEntrySpecFromOpsAndLabels(ns string, ops, labels []string, srcOrDstFlag string, isNamespaceSelector bool) []string {
var spec []string
if ns != "" {
spec = []string{
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName("ns-" + ns),
srcOrDstFlag,
}
}
if len(ops) == 1 && len(labels) == 1 {
if ops[0] == "" && labels[0] == "" {
if isNamespaceSelector {
// This is an empty namespaceSelector,
// selecting all namespaces.
spec = []string{
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(util.KubeAllNamespacesFlag),
srcOrDstFlag,
}
}
return spec
}
}
for i, _ := range ops {
spec = append(spec, craftPartialIptEntrySpecFromOpAndLabel(ops[i], labels[i], srcOrDstFlag, isNamespaceSelector)...)
}
return spec
}
// craftPartialIptEntrySpecFromSelector :- ns must be "" for namespace selectors
func craftPartialIptEntrySpecFromSelector(ns string, selector *metav1.LabelSelector, srcOrDstFlag string, isNamespaceSelector bool) []string {
labelsWithOps, _, _ := parseSelector(selector)
ops, labels := GetOperatorsAndLabels(labelsWithOps)
return craftPartialIptEntrySpecFromOpsAndLabels(ns, ops, labels, srcOrDstFlag, isNamespaceSelector)
}
// craftPartialIptablesCommentFromSelector :- ns must be "" for namespace selectors
func craftPartialIptablesCommentFromSelector(ns string, selector *metav1.LabelSelector, isNamespaceSelector bool) string {
if selector == nil {
return "none"
}
if len(selector.MatchExpressions) == 0 && len(selector.MatchLabels) == 0 {
if isNamespaceSelector {
return util.KubeAllNamespacesFlag
}
return "ns-" + ns
}
labelsWithOps, _, _ := parseSelector(selector)
ops, labelsWithoutOps := GetOperatorsAndLabels(labelsWithOps)
var comment, prefix, postfix string
if isNamespaceSelector {
prefix = "ns-"
} else {
if ns != "" {
postfix = "-IN-ns-" + ns
}
}
for i, _ := range labelsWithoutOps {
comment += prefix + ops[i] + labelsWithoutOps[i]
comment += "-AND-"
}
return comment[:len(comment)-len("-AND-")] + postfix
}
func translateIngress(ns string, policyName string, targetSelector metav1.LabelSelector, rules []networkingv1.NetworkPolicyIngressRule) ([]string, []string, []string, [][]string, []*iptm.IptEntry) {
var (
sets []string // ipsets with type: net:hash
namedPorts []string // ipsets with type: hash:ip,port
lists []string // ipsets with type: list:set
ipCidrs [][]string
entries []*iptm.IptEntry
fromRuleEntries []*iptm.IptEntry
addedCidrEntry bool // all cidr entry will be added in one set per from/to rule
addedIngressFromEntry, addedPortEntry bool // add drop entries at the end of the chain when there are non ALLOW-ALL* rules
)
log.Logf("started parsing ingress rule")
labelsWithOps, _, _ := parseSelector(&targetSelector)
ops, labels := GetOperatorsAndLabels(labelsWithOps)
sets = append(sets, labels...)
sets = append(sets, "ns-"+ns)
ipCidrs = make([][]string, len(rules))
targetSelectorIptEntrySpec := craftPartialIptEntrySpecFromOpsAndLabels(ns, ops, labels, util.IptablesDstFlag, false)
targetSelectorComment := craftPartialIptablesCommentFromSelector(ns, &targetSelector, false)
for i, rule := range rules {
allowExternal := false
portRuleExists := rule.Ports != nil && len(rule.Ports) > 0
fromRuleExists := false
addedPortEntry = addedPortEntry || portRuleExists
ipCidrs[i] = make([]string, len(rule.From))
if rule.From != nil {
if len(rule.From) == 0 {
fromRuleExists = true
allowExternal = true
}
for _, fromRule := range rule.From {
if fromRule.PodSelector != nil ||
fromRule.NamespaceSelector != nil ||
fromRule.IPBlock != nil {
fromRuleExists = true
break
}
}
} else if !portRuleExists {
allowExternal = true
}
if !portRuleExists && !fromRuleExists && !allowExternal {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
}
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(util.KubeAllNamespacesFlag),
util.IptablesSrcFlag,
)
entry.Specs = append(entry.Specs, targetSelectorIptEntrySpec...)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-TO-"+targetSelectorComment+
"-FROM-"+util.KubeAllNamespacesFlag,
)
entries = append(entries, entry)
lists = append(lists, util.KubeAllNamespacesFlag)
continue
}
// Only Ports rules exist
if portRuleExists && !fromRuleExists && !allowExternal {
for _, portRule := range rule.Ports {
switch portCheck := getPortType(portRule); portCheck {
case "namedport":
portName := util.NamedPortIPSetPrefix + portRule.Port.String()
namedPorts = append(namedPorts, portName)
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(portName),
util.IptablesDstFlag+","+util.IptablesDstFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-"+
craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
case "validport":
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: craftPartialIptEntrySpecFromPort(portRule, util.IptablesDstPortFlag),
}
entry.Specs = append(entry.Specs, targetSelectorIptEntrySpec...)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-"+
craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
default:
log.Logf("Invalid NetworkPolicyPort.")
}
}
continue
}
// fromRuleExists
for j, fromRule := range rule.From {
// Handle IPBlock field of NetworkPolicyPeer
if fromRule.IPBlock != nil {
if len(fromRule.IPBlock.CIDR) > 0 {
ipCidrs[i] = append(ipCidrs[i], fromRule.IPBlock.CIDR)
cidrIpsetName := policyName + "-in-ns-" + ns + "-" + strconv.Itoa(i) + "in"
if len(fromRule.IPBlock.Except) > 0 {
for _, except := range fromRule.IPBlock.Except {
// TODO move IP cidrs rule to allow based only
ipCidrs[i] = append(ipCidrs[i], except+util.IpsetNomatch)
}
addedIngressFromEntry = true
}
if j != 0 && addedCidrEntry {
continue
}
if portRuleExists {
for _, portRule := range rule.Ports {
switch portCheck := getPortType(portRule); portCheck {
case "namedport":
portName := util.NamedPortIPSetPrefix + portRule.Port.String()
namedPorts = append(namedPorts, portName)
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(cidrIpsetName),
util.IptablesSrcFlag,
)
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(portName),
util.IptablesDstFlag+","+util.IptablesDstFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+cidrIpsetName+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
fromRuleEntries = append(fromRuleEntries, entry)
case "validport":
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(cidrIpsetName),
util.IptablesSrcFlag,
)
entry.Specs = append(
entry.Specs,
craftPartialIptEntrySpecFromPort(portRule, util.IptablesDstPortFlag)...,
)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+cidrIpsetName+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
fromRuleEntries = append(fromRuleEntries, entry)
default:
log.Logf("Invalid NetworkPolicyPort.")
}
}
} else {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressFromChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(cidrIpsetName),
util.IptablesSrcFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+cidrIpsetName+
"-TO-"+targetSelectorComment,
)
fromRuleEntries = append(fromRuleEntries, entry)
addedIngressFromEntry = true
}
addedCidrEntry = true
}
continue
}
// Handle podSelector and namespaceSelector.
// For PodSelector, use hash:net in ipset.
// For NamespaceSelector, use set:list in ipset.
if fromRule.PodSelector == nil && fromRule.NamespaceSelector == nil {
continue
}
if fromRule.PodSelector == nil && fromRule.NamespaceSelector != nil {
nsLabelsWithOps, _, _ := parseSelector(fromRule.NamespaceSelector)
_, nsLabelsWithoutOps := GetOperatorsAndLabels(nsLabelsWithOps)
if len(nsLabelsWithoutOps) == 1 && nsLabelsWithoutOps[0] == "" {
// Empty namespaceSelector. This selects all namespaces
nsLabelsWithoutOps[0] = util.KubeAllNamespacesFlag
} else {
for i, _ := range nsLabelsWithoutOps {
// Add namespaces prefix to distinguish namespace ipset lists and pod ipsets
nsLabelsWithoutOps[i] = "ns-" + nsLabelsWithoutOps[i]
}
}
lists = append(lists, nsLabelsWithoutOps...)
iptPartialNsSpec := craftPartialIptEntrySpecFromSelector("", fromRule.NamespaceSelector, util.IptablesSrcFlag, true)
iptPartialNsComment := craftPartialIptablesCommentFromSelector("", fromRule.NamespaceSelector, true)
if portRuleExists {
for _, portRule := range rule.Ports {
switch portCheck := getPortType(portRule); portCheck {
case "namedport":
portName := util.NamedPortIPSetPrefix + portRule.Port.String()
namedPorts = append(namedPorts, portName)
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
iptPartialNsSpec...,
)
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(portName),
util.IptablesDstFlag+","+util.IptablesDstFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialNsComment+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
case "validport":
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
iptPartialNsSpec...,
)
entry.Specs = append(
entry.Specs,
craftPartialIptEntrySpecFromPort(portRule, util.IptablesDstPortFlag)...,
)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialNsComment+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
default:
log.Logf("Invalid NetworkPolicyPort.")
}
}
} else {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressFromChain,
Specs: append([]string(nil), iptPartialNsSpec...),
}
entry.Specs = append(
entry.Specs,
targetSelectorIptEntrySpec...,
)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialNsComment+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
addedIngressFromEntry = true
}
continue
}
if fromRule.PodSelector != nil && fromRule.NamespaceSelector == nil {
podLabelsWithOps, _, _ := parseSelector(fromRule.PodSelector)
_, podLabelsWithoutOps := GetOperatorsAndLabels(podLabelsWithOps)
if len(podLabelsWithoutOps) == 1 {
if podLabelsWithoutOps[0] == "" {
podLabelsWithoutOps[0] = "ns-" + ns
}
}
sets = append(sets, podLabelsWithoutOps...)
iptPartialPodSpec := craftPartialIptEntrySpecFromSelector(ns, fromRule.PodSelector, util.IptablesSrcFlag, false)
iptPartialPodComment := craftPartialIptablesCommentFromSelector(ns, fromRule.PodSelector, false)
if portRuleExists {
for _, portRule := range rule.Ports {
switch portCheck := getPortType(portRule); portCheck {
case "namedport":
portName := util.NamedPortIPSetPrefix + portRule.Port.String()
namedPorts = append(namedPorts, portName)
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
iptPartialPodSpec...,
)
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(portName),
util.IptablesDstFlag+","+util.IptablesDstFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialPodComment+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
case "validport":
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
iptPartialPodSpec...,
)
entry.Specs = append(
entry.Specs,
craftPartialIptEntrySpecFromPort(portRule, util.IptablesDstPortFlag)...,
)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialPodComment+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
default:
log.Logf("Invalid NetworkPolicyPort.")
}
}
} else {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressFromChain,
Specs: append([]string(nil), iptPartialPodSpec...),
}
entry.Specs = append(
entry.Specs,
targetSelectorIptEntrySpec...,
)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialPodComment+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
addedIngressFromEntry = true
}
continue
}
// fromRule has both namespaceSelector and podSelector set.
// We should match the selected pods in the selected namespaces.
// This allows traffic from podSelector intersects namespaceSelector
// This is only supported in kubernetes version >= 1.11
if !util.IsNewNwPolicyVerFlag {
continue
}
nsLabelsWithOps, _, _ := parseSelector(fromRule.NamespaceSelector)
_, nsLabelsWithoutOps := GetOperatorsAndLabels(nsLabelsWithOps)
// Add namespaces prefix to distinguish namespace ipsets and pod ipsets
for i, _ := range nsLabelsWithoutOps {
nsLabelsWithoutOps[i] = "ns-" + nsLabelsWithoutOps[i]
}
lists = append(lists, nsLabelsWithoutOps...)
podLabelsWithOps, _, _ := parseSelector(fromRule.PodSelector)
_, podLabelsWithoutOps := GetOperatorsAndLabels(podLabelsWithOps)
sets = append(sets, podLabelsWithoutOps...)
// we pass empty ns for the podspec and comment here because it's a combo of both selectors and not limited to network policy namespace
iptPartialNsSpec := craftPartialIptEntrySpecFromSelector("", fromRule.NamespaceSelector, util.IptablesSrcFlag, true)
iptPartialPodSpec := craftPartialIptEntrySpecFromSelector("", fromRule.PodSelector, util.IptablesSrcFlag, false)
iptPartialNsComment := craftPartialIptablesCommentFromSelector("", fromRule.NamespaceSelector, true)
iptPartialPodComment := craftPartialIptablesCommentFromSelector("", fromRule.PodSelector, false)
if portRuleExists {
for _, portRule := range rule.Ports {
switch portCheck := getPortType(portRule); portCheck {
case "namedport":
portName := util.NamedPortIPSetPrefix + portRule.Port.String()
namedPorts = append(namedPorts, portName)
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), iptPartialNsSpec...),
}
entry.Specs = append(
entry.Specs,
iptPartialPodSpec...,
)
entry.Specs = append(
entry.Specs,
targetSelectorIptEntrySpec...,
)
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(portName),
util.IptablesDstFlag+","+util.IptablesDstFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialNsComment+
"-AND-"+iptPartialPodComment+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
case "validport":
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), iptPartialNsSpec...),
}
entry.Specs = append(
entry.Specs,
iptPartialPodSpec...,
)
entry.Specs = append(
entry.Specs,
targetSelectorIptEntrySpec...,
)
entry.Specs = append(
entry.Specs,
craftPartialIptEntrySpecFromPort(portRule, util.IptablesDstPortFlag)...,
)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialNsComment+
"-AND-"+iptPartialPodComment+
"-AND-"+craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
default:
log.Logf("Invalid NetworkPolicyPort.")
}
}
} else {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressFromChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
iptPartialNsSpec...,
)
entry.Specs = append(
entry.Specs,
iptPartialPodSpec...,
)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-"+iptPartialNsComment+
"-AND-"+iptPartialPodComment+
"-TO-"+targetSelectorComment,
)
entries = append(entries, entry)
addedIngressFromEntry = true
}
}
if allowExternal {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureIngressMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-TO-"+
targetSelectorComment,
)
entries = append(entries, entry)
continue
}
}
// prepending fromRuleEntries (which is in reverse order) so that they will retain correct ordering
// of drop->allow... when the rules are beind prepended to their corresponding chain
if len(fromRuleEntries) > 0 {
entries = append(fromRuleEntries, entries...)
}
if addedPortEntry && !addedIngressFromEntry {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
IsJumpEntry: true,
}
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesAzureIngressDropsChain,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-TO-"+
targetSelectorComment+
"-TO-JUMP-TO-"+util.IptablesAzureIngressDropsChain,
)
entries = append(entries, entry)
} else if addedIngressFromEntry {
portEntry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
IsJumpEntry: true,
}
portEntry.Specs = append(
portEntry.Specs,
util.IptablesJumpFlag,
util.IptablesAzureIngressFromChain,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-TO-"+
targetSelectorComment+
"-TO-JUMP-TO-"+util.IptablesAzureIngressFromChain,
)
entries = append(entries, portEntry)
entry := &iptm.IptEntry{
Chain: util.IptablesAzureIngressFromChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
IsJumpEntry: true,
}
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesAzureIngressDropsChain,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-TO-"+
targetSelectorComment+
"-TO-JUMP-TO-"+util.IptablesAzureIngressDropsChain,
)
entries = append(entries, entry)
}
log.Logf("finished parsing ingress rule")
return util.DropEmptyFields(sets), util.DropEmptyFields(namedPorts), util.DropEmptyFields(lists), ipCidrs, entries
}
func translateEgress(ns string, policyName string, targetSelector metav1.LabelSelector, rules []networkingv1.NetworkPolicyEgressRule) ([]string, []string, []string, [][]string, []*iptm.IptEntry) {
var (
sets []string // ipsets with type: net:hash
namedPorts []string // ipsets with type: hash:ip,port
lists []string // ipsets with type: list:set
ipCidrs [][]string
entries []*iptm.IptEntry
toRuleEntries []*iptm.IptEntry
addedCidrEntry bool // all cidr entry will be added in one set per from/to rule
addedEgressToEntry, addedPortEntry bool // add drop entry when there are non ALLOW-ALL* rules
)
log.Logf("started parsing egress rule")
labelsWithOps, _, _ := parseSelector(&targetSelector)
ops, labels := GetOperatorsAndLabels(labelsWithOps)
sets = append(sets, labels...)
sets = append(sets, "ns-"+ns)
ipCidrs = make([][]string, len(rules))
targetSelectorIptEntrySpec := craftPartialIptEntrySpecFromOpsAndLabels(ns, ops, labels, util.IptablesSrcFlag, false)
targetSelectorComment := craftPartialIptablesCommentFromSelector(ns, &targetSelector, false)
for i, rule := range rules {
allowExternal := false
portRuleExists := rule.Ports != nil && len(rule.Ports) > 0
toRuleExists := false
addedPortEntry = addedPortEntry || portRuleExists
ipCidrs[i] = make([]string, len(rule.To))
if rule.To != nil {
if len(rule.To) == 0 {
toRuleExists = true
allowExternal = true
}
for _, toRule := range rule.To {
if toRule.PodSelector != nil ||
toRule.NamespaceSelector != nil ||
toRule.IPBlock != nil {
toRuleExists = true
break
}
}
} else if !portRuleExists {
allowExternal = true
}
if !portRuleExists && !toRuleExists && !allowExternal {
entry := &iptm.IptEntry{
Chain: util.IptablesAzureEgressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(util.KubeAllNamespacesFlag),
util.IptablesDstFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureEgressXMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-FROM-"+targetSelectorComment+
"-TO-"+util.KubeAllNamespacesFlag,
)
entries = append(entries, entry)
lists = append(lists, util.KubeAllNamespacesFlag)
continue
}
// Only Ports rules exist
if portRuleExists && !toRuleExists && !allowExternal {
for _, portRule := range rule.Ports {
switch portCheck := getPortType(portRule); portCheck {
case "namedport":
portName := util.NamedPortIPSetPrefix + portRule.Port.String()
namedPorts = append(namedPorts, portName)
entry := &iptm.IptEntry{
Chain: util.IptablesAzureEgressPortChain,
Specs: append([]string(nil), targetSelectorIptEntrySpec...),
}
entry.Specs = append(
entry.Specs,
util.IptablesModuleFlag,
util.IptablesSetModuleFlag,
util.IptablesMatchSetFlag,
util.GetHashedName(portName),
util.IptablesDstFlag+","+util.IptablesDstFlag,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureEgressXMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-TO-"+
craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-FROM-"+targetSelectorComment,
)
entries = append(entries, entry)
case "validport":
entry := &iptm.IptEntry{
Chain: util.IptablesAzureEgressPortChain,
Specs: craftPartialIptEntrySpecFromPort(portRule, util.IptablesDstPortFlag),
}
entry.Specs = append(entry.Specs, targetSelectorIptEntrySpec...)
entry.Specs = append(
entry.Specs,
util.IptablesJumpFlag,
util.IptablesMark,
util.IptablesSetMarkFlag,
util.IptablesAzureEgressXMarkHex,
util.IptablesModuleFlag,
util.IptablesCommentModuleFlag,
util.IptablesCommentFlag,
"ALLOW-ALL-TO-"+
craftPartialIptablesCommentFromPort(portRule, util.IptablesDstPortFlag)+
"-FROM-"+targetSelectorComment,
)
entries = append(entries, entry)
default:
log.Logf("Invalid NetworkPolicyPort.")
}
}
continue
}
// toRuleExists
for j, toRule := range rule.To {
// Handle IPBlock field of NetworkPolicyPeer
if toRule.IPBlock != nil {
if len(toRule.IPBlock.CIDR) > 0 {
ipCidrs[i] = append(ipCidrs[i], toRule.IPBlock.CIDR)
cidrIpsetName := policyName + "-in-ns-" + ns + "-" + strconv.Itoa(i) + "out"
if len(toRule.IPBlock.Except) > 0 {
for _, except := range toRule.IPBlock.Except {
// TODO move IP cidrs rule to allow based only
ipCidrs[i] = append(ipCidrs[i], except+util.IpsetNomatch)
}
addedEgressToEntry = true
}
if j != 0 && addedCidrEntry {
continue
}