main.go

Documentation: k8s.io/kubernetes/test/images/agnhost/audit-proxy

     1  /*
     2  Copyright 2019 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package auditproxy
    18  
    19  import (
    20  	"io"
    21  	"log"
    22  	"net/http"
    23  	"os"
    24  
    25  	"github.com/spf13/cobra"
    26  
    27  	"k8s.io/apimachinery/pkg/runtime"
    28  	"k8s.io/apimachinery/pkg/runtime/serializer/json"
    29  	auditinstall "k8s.io/apiserver/pkg/apis/audit/install"
    30  	auditv1 "k8s.io/apiserver/pkg/apis/audit/v1"
    31  	"k8s.io/apiserver/pkg/audit"
    32  )
    33  
    34  // CmdAuditProxy is used by agnhost Cobra.
    35  var CmdAuditProxy = &cobra.Command{
    36  	Use:   "audit-proxy",
    37  	Short: "Listens on port 8080 for incoming audit events",
    38  	Long:  "Used to test dynamic auditing. It listens on port 8080 for incoming audit events and writes them in a uniform manner to stdout.",
    39  	Args:  cobra.MaximumNArgs(0),
    40  	Run:   main,
    41  }
    42  
    43  var (
    44  	encoder runtime.Encoder
    45  	decoder runtime.Decoder
    46  )
    47  
    48  func main(cmd *cobra.Command, args []string) {
    49  	scheme := runtime.NewScheme()
    50  	auditinstall.Install(scheme)
    51  	serializer := json.NewSerializerWithOptions(json.DefaultMetaFactory, scheme, scheme, json.SerializerOptions{Pretty: false})
    52  	encoder = audit.Codecs.EncoderForVersion(serializer, auditv1.SchemeGroupVersion)
    53  	decoder = audit.Codecs.UniversalDecoder(auditv1.SchemeGroupVersion)
    54  
    55  	http.HandleFunc("/", handler)
    56  	log.Fatal(http.ListenAndServe(":8080", nil))
    57  }
    58  
    59  func handler(w http.ResponseWriter, req *http.Request) {
    60  	body, err := io.ReadAll(req.Body)
    61  	if err != nil {
    62  		log.Printf("could not read request body: %v", err)
    63  		w.WriteHeader(http.StatusInternalServerError)
    64  		return
    65  	}
    66  	el := &auditv1.EventList{}
    67  
    68  	if err := runtime.DecodeInto(decoder, body, el); err != nil {
    69  		log.Printf("failed decoding buf: %b, apiVersion: %s", body, auditv1.SchemeGroupVersion)
    70  		w.WriteHeader(http.StatusInternalServerError)
    71  		return
    72  	}
    73  	defer req.Body.Close()
    74  
    75  	// write events to stdout
    76  	for _, event := range el.Items {
    77  		err := encoder.Encode(&event, os.Stdout)
    78  		if err != nil {
    79  			log.Printf("could not encode audit event: %v", err)
    80  			w.WriteHeader(http.StatusInternalServerError)
    81  			return
    82  		}
    83  	}
    84  	w.WriteHeader(http.StatusOK)
    85  }
    86
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