mirror of
https://github.com/optim-enterprises-bv/kubernetes.git
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107 lines
4.2 KiB
Go
107 lines
4.2 KiB
Go
/*
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Copyright 2022 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package service
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import (
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"fmt"
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"net/netip"
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"k8s.io/apimachinery/pkg/util/validation/field"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/apis/core/helper"
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)
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func GetWarningsForService(service, oldService *api.Service) []string {
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if service == nil {
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return nil
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}
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var warnings []string
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if _, ok := service.Annotations[api.DeprecatedAnnotationTopologyAwareHints]; ok {
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warnings = append(warnings, fmt.Sprintf("annotation %s is deprecated, please use %s instead", api.DeprecatedAnnotationTopologyAwareHints, api.AnnotationTopologyMode))
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}
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if helper.IsServiceIPSet(service) {
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for i, clusterIP := range service.Spec.ClusterIPs {
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warnings = append(warnings, getWarningsForIP(field.NewPath("spec").Child("clusterIPs").Index(i), clusterIP)...)
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}
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}
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for i, externalIP := range service.Spec.ExternalIPs {
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warnings = append(warnings, getWarningsForIP(field.NewPath("spec").Child("externalIPs").Index(i), externalIP)...)
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}
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if len(service.Spec.LoadBalancerIP) > 0 {
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warnings = append(warnings, getWarningsForIP(field.NewPath("spec").Child("loadBalancerIP"), service.Spec.LoadBalancerIP)...)
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}
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for i, cidr := range service.Spec.LoadBalancerSourceRanges {
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warnings = append(warnings, getWarningsForCIDR(field.NewPath("spec").Child("loadBalancerSourceRanges").Index(i), cidr)...)
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}
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if service.Spec.Type == api.ServiceTypeExternalName && len(service.Spec.ExternalIPs) > 0 {
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warnings = append(warnings, fmt.Sprintf("spec.externalIPs is ignored when spec.type is %q", api.ServiceTypeExternalName))
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}
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if service.Spec.Type != api.ServiceTypeExternalName && service.Spec.ExternalName != "" {
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warnings = append(warnings, fmt.Sprintf("spec.externalName is ignored when spec.type is not %q", api.ServiceTypeExternalName))
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}
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return warnings
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}
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func getWarningsForIP(fieldPath *field.Path, address string) []string {
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// IPv4 addresses with leading zeros CVE-2021-29923 are not valid in golang since 1.17
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// This will also warn about possible future changes on the golang std library
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// xref: https://issues.k8s.io/108074
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ip, err := netip.ParseAddr(address)
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if err != nil {
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return []string{fmt.Sprintf("%s: IP address was accepted, but will be invalid in a future Kubernetes release: %v", fieldPath, err)}
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}
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// A Recommendation for IPv6 Address Text Representation
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//
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// "All of the above examples represent the same IPv6 address. This
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// flexibility has caused many problems for operators, systems
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// engineers, and customers.
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// ..."
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// https://datatracker.ietf.org/doc/rfc5952/
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if ip.Is6() && ip.String() != address {
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return []string{fmt.Sprintf("%s: IPv6 address %q is not in RFC 5952 canonical format (%q), which may cause controller apply-loops", fieldPath, address, ip.String())}
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}
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return []string{}
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}
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func getWarningsForCIDR(fieldPath *field.Path, cidr string) []string {
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// IPv4 addresses with leading zeros CVE-2021-29923 are not valid in golang since 1.17
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// This will also warn about possible future changes on the golang std library
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// xref: https://issues.k8s.io/108074
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prefix, err := netip.ParsePrefix(cidr)
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if err != nil {
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return []string{fmt.Sprintf("%s: IP prefix was accepted, but will be invalid in a future Kubernetes release: %v", fieldPath, err)}
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}
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// A Recommendation for IPv6 Address Text Representation
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//
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// "All of the above examples represent the same IPv6 address. This
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// flexibility has caused many problems for operators, systems
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// engineers, and customers.
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// ..."
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// https://datatracker.ietf.org/doc/rfc5952/
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if prefix.Addr().Is6() && prefix.String() != cidr {
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return []string{fmt.Sprintf("%s: IPv6 prefix %q is not in RFC 5952 canonical format (%q), which may cause controller apply-loops", fieldPath, cidr, prefix.String())}
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}
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return []string{}
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}
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