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Remove k8s.io/apiserver ability to bind insecure ports

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The project does not recommend using insecure ports.  Even
unauthenticated TLS is an improvement since it provides confidentiality.
If you relied upon this, please update to secure serving options.
This commit is contained in:
David Eads 2024-03-18 09:25:49 -04:00
parent a1605fb3dd
commit de302c73e9
3 changed files with 4 additions and 136 deletions
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126
staging/src/k8s.io/apiserver/pkg/server/options/deprecated_insecure_serving.go
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@ -1,126 +0,0 @@
/*
Copyright 2017 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 options
import (
"fmt"
"net"
"github.com/spf13/pflag"
"k8s.io/apiserver/pkg/server"
)
// DeprecatedInsecureServingOptions are for creating an unauthenticated, unauthorized, insecure port.
// No one should be using these anymore.
// DEPRECATED: all insecure serving options are removed in a future version
type DeprecatedInsecureServingOptions struct {
BindAddress net.IP
BindPort int
// BindNetwork is the type of network to bind to - defaults to "tcp", accepts "tcp",
// "tcp4", and "tcp6".
BindNetwork string
// Listener is the secure server network listener.
// either Listener or BindAddress/BindPort/BindNetwork is set,
// if Listener is set, use it and omit BindAddress/BindPort/BindNetwork.
Listener net.Listener
// ListenFunc can be overridden to create a custom listener, e.g. for mocking in tests.
// It defaults to options.CreateListener.
ListenFunc func(network, addr string, config net.ListenConfig) (net.Listener, int, error)
}
// Validate ensures that the insecure port values within the range of the port.
func (s *DeprecatedInsecureServingOptions) Validate() []error {
if s == nil {
return nil
}
errors := []error{}
if s.BindPort < 0 || s.BindPort > 65535 {
errors = append(errors, fmt.Errorf("insecure port %v must be between 0 and 65535, inclusive. 0 for turning off insecure (HTTP) port", s.BindPort))
}
return errors
}
// AddFlags adds flags related to insecure serving to the specified FlagSet.
func (s *DeprecatedInsecureServingOptions) AddFlags(fs *pflag.FlagSet) {
if s == nil {
return
}
fs.IPVar(&s.BindAddress, "insecure-bind-address", s.BindAddress, ""+
"The IP address on which to serve the --insecure-port (set to 0.0.0.0 or :: for listening on all interfaces and IP address families).")
// Though this flag is deprecated, we discovered security concerns over how to do health checks without it e.g. #43784
fs.MarkDeprecated("insecure-bind-address", "This flag will be removed in a future version.")
fs.Lookup("insecure-bind-address").Hidden = false
fs.IntVar(&s.BindPort, "insecure-port", s.BindPort, ""+
"The port on which to serve unsecured, unauthenticated access.")
// Though this flag is deprecated, we discovered security concerns over how to do health checks without it e.g. #43784
fs.MarkDeprecated("insecure-port", "This flag will be removed in a future version.")
fs.Lookup("insecure-port").Hidden = false
}
// AddUnqualifiedFlags adds flags related to insecure serving without the --insecure prefix to the specified FlagSet.
func (s *DeprecatedInsecureServingOptions) AddUnqualifiedFlags(fs *pflag.FlagSet) {
if s == nil {
return
}
fs.IPVar(&s.BindAddress, "address", s.BindAddress,
"The IP address on which to serve the insecure --port (set to '0.0.0.0' or '::' for listening on all interfaces and IP address families).")
fs.MarkDeprecated("address", "see --bind-address instead.")
fs.Lookup("address").Hidden = false
fs.IntVar(&s.BindPort, "port", s.BindPort, "The port on which to serve unsecured, unauthenticated access. Set to 0 to disable.")
fs.MarkDeprecated("port", "see --secure-port instead.")
fs.Lookup("port").Hidden = false
}
// ApplyTo adds DeprecatedInsecureServingOptions to the insecureserverinfo and kube-controller manager configuration.
// Note: the double pointer allows to set the *DeprecatedInsecureServingInfo to nil without referencing the struct hosting this pointer.
func (s *DeprecatedInsecureServingOptions) ApplyTo(c **server.DeprecatedInsecureServingInfo) error {
if s == nil {
return nil
}
if s.BindPort <= 0 {
return nil
}
if s.Listener == nil {
var err error
listen := CreateListener
if s.ListenFunc != nil {
listen = s.ListenFunc
}
addr := net.JoinHostPort(s.BindAddress.String(), fmt.Sprintf("%d", s.BindPort))
s.Listener, s.BindPort, err = listen(s.BindNetwork, addr, net.ListenConfig{})
if err != nil {
return fmt.Errorf("failed to create listener: %v", err)
}
}
*c = &server.DeprecatedInsecureServingInfo{
Listener: s.Listener,
}
return nil
}

13
staging/src/k8s.io/pod-security-admission/cmd/webhook/server/options/options.go
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@ -40,21 +40,18 @@ type Options struct {
ClientQPSLimit float32
ClientQPSBurst int
SecureServing apiserveroptions.SecureServingOptions
InsecureServing apiserveroptions.DeprecatedInsecureServingOptions
SecureServing apiserveroptions.SecureServingOptions
}
func NewOptions() *Options {
secureServing := apiserveroptions.NewSecureServingOptions()
secureServing.ServerCert.PairName = "webhook"
o := &Options{
SecureServing: *secureServing,
InsecureServing: apiserveroptions.DeprecatedInsecureServingOptions{},
ClientQPSLimit: DefaultClientQPSLimit,
ClientQPSBurst: DefaultClientQPSBurst,
SecureServing: *secureServing,
ClientQPSLimit: DefaultClientQPSLimit,
ClientQPSBurst: DefaultClientQPSBurst,
}
o.SecureServing.BindPort = DefaultPort
o.InsecureServing.BindPort = DefaultInsecurePort
return o
}
@ -65,7 +62,6 @@ func (o *Options) AddFlags(fs *pflag.FlagSet) {
fs.IntVar(&o.ClientQPSBurst, "client-qps-burst", o.ClientQPSBurst, "Client QPS burst limit for throttling requests to the API server.")
o.SecureServing.AddFlags(fs)
o.InsecureServing.AddFlags(fs)
}
// Validate validates all the required options.
@ -73,7 +69,6 @@ func (o *Options) Validate() []error {
var errs []error
errs = append(errs, o.SecureServing.Validate()...)
errs = append(errs, o.InsecureServing.Validate()...)
return errs
}

1
staging/src/k8s.io/pod-security-admission/cmd/webhook/server/server.go
View File

@ -243,7 +243,6 @@ func LoadConfig(opts *options.Options) (*Config, error) {
var c Config
opts.SecureServing.ApplyTo(&c.SecureServing)
opts.InsecureServing.ApplyTo(&c.InsecureServing)
// Load Kube Client
kubeConfig, err := clientcmd.BuildConfigFromFlags("", opts.Kubeconfig)