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run.go
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run.go
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// Copyright Jetstack Ltd. See LICENSE for details.
package cmd
import (
"errors"
"fmt"
"strconv"
"time"
"github.com/spf13/cobra"
"k8s.io/apiserver/pkg/authentication/request/bearertoken"
"k8s.io/apiserver/pkg/server"
apiserverflag "k8s.io/apiserver/pkg/util/flag"
"k8s.io/apiserver/pkg/util/globalflag"
"k8s.io/apiserver/plugin/pkg/authenticator/token/oidc"
"k8s.io/cli-runtime/pkg/genericclioptions"
"k8s.io/client-go/rest"
apiserveroptions "k8s.io/kubernetes/pkg/kubeapiserver/options"
"github.com/jetstack/kube-oidc-proxy/pkg/probe"
"github.com/jetstack/kube-oidc-proxy/pkg/proxy"
"github.com/jetstack/kube-oidc-proxy/pkg/version"
)
const (
readinessProbePort = 8080
)
func NewRunCommand(stopCh <-chan struct{}) *cobra.Command {
// flag option structs
oidcOptions := &apiserveroptions.BuiltInAuthenticationOptions{
OIDC: &apiserveroptions.OIDCAuthenticationOptions{},
}
secureServingOptions := apiserveroptions.NewSecureServingOptions()
secureServingOptions.ServerCert.PairName = "kube-oidc-proxy"
clientConfigFlags := genericclioptions.NewConfigFlags()
healthCheck := probe.New(strconv.Itoa(readinessProbePort))
// proxy command
cmd := &cobra.Command{
Use: "k8s-oidc-proxy",
Long: "k8s-oidc-proxy is a reverse proxy to authenticate users to Kubernetes API servers with Open ID Connect Authentication.",
RunE: func(cmd *cobra.Command, args []string) error {
if cmd.Flag("version").Value.String() == "true" {
version.PrintVersionAndExit()
}
if secureServingOptions.SecureServingOptions.BindPort == readinessProbePort {
return errors.New("unable to securely serve on port 8080, used by readiness prob")
}
// client rest config
restConfig, err := rest.InClusterConfig()
if err != nil {
// fall back to cli flags if in cluster fails
restConfig, err = clientConfigFlags.ToRESTConfig()
if err != nil {
return err
}
}
// oidc config
oidcAuther, err := oidc.New(oidc.Options{
APIAudiences: oidcOptions.APIAudiences,
CAFile: oidcOptions.OIDC.CAFile,
ClientID: oidcOptions.OIDC.ClientID,
GroupsClaim: oidcOptions.OIDC.GroupsClaim,
GroupsPrefix: oidcOptions.OIDC.GroupsPrefix,
IssuerURL: oidcOptions.OIDC.IssuerURL,
RequiredClaims: oidcOptions.OIDC.RequiredClaims,
SupportedSigningAlgs: oidcOptions.OIDC.SigningAlgs,
UsernameClaim: oidcOptions.OIDC.UsernameClaim,
UsernamePrefix: oidcOptions.OIDC.UsernamePrefix,
})
if err != nil {
return err
}
// oidc auther from config
reqAuther := bearertoken.New(oidcAuther)
secureServingInfo := new(server.SecureServingInfo)
if err := secureServingOptions.ApplyTo(&secureServingInfo, nil); err != nil {
return err
}
p := proxy.New(restConfig, reqAuther, secureServingInfo)
// run proxy
if err := p.Run(stopCh); err != nil {
return err
}
time.Sleep(time.Second * 3)
healthCheck.SetReady()
<-stopCh
return nil
},
}
// add flags to command sets
var namedFlagSets apiserverflag.NamedFlagSets
fs := cmd.Flags()
oidcfs := namedFlagSets.FlagSet("OIDC")
oidcOptions.AddFlags(oidcfs)
secureServingOptions.AddFlags(namedFlagSets.FlagSet("secure serving"))
clientConfigFlags.CacheDir = nil
clientConfigFlags.Impersonate = nil
clientConfigFlags.ImpersonateGroup = nil
clientConfigFlags.AddFlags(namedFlagSets.FlagSet("client"))
globalflag.AddGlobalFlags(namedFlagSets.FlagSet("misc"), cmd.Name())
namedFlagSets.FlagSet("misc").Bool("version",
false, "Print version information and quit")
for _, f := range namedFlagSets.FlagSets {
fs.AddFlagSet(f)
}
// pretty output from kube-apiserver
usageFmt := "Usage:\n %s\n"
cols, _, _ := apiserverflag.TerminalSize(cmd.OutOrStdout())
cmd.SetUsageFunc(func(cmd *cobra.Command) error {
fmt.Fprintf(cmd.OutOrStderr(), usageFmt, cmd.UseLine())
apiserverflag.PrintSections(cmd.OutOrStderr(), namedFlagSets, cols)
return nil
})
cmd.SetHelpFunc(func(cmd *cobra.Command, args []string) {
fmt.Fprintf(cmd.OutOrStdout(), "%s\n\n"+usageFmt, cmd.Long, cmd.UseLine())
apiserverflag.PrintSections(cmd.OutOrStdout(), namedFlagSets, cols)
})
return cmd
}