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package main
import (
"bufio"
"flag"
"fmt"
"io"
"log"
"os"
"os/exec"
"path/filepath"
"strconv"
"strings"
"sync"
"github.com/elastic/go-libaudit/v2"
"github.com/elastic/go-libaudit/v2/auparse"
)
var (
fs = flag.NewFlagSet("audit", flag.ExitOnError)
diag = fs.String("diag", "", "dump raw information from kernel to file")
rate = fs.Uint("rate", 0, "rate limit in kernel (default 0, no rate limit)")
backlog = fs.Uint("backlog", 8192, "backlog limit")
immutable = fs.Bool("immutable", false, "make kernel audit settings immutable (requires reboot to undo)")
receiveOnly = fs.Bool("ro", false, "receive only using multicast, requires kernel 3.16+")
)
type process struct {
cmdline string
rootfs string
children []int
}
var pids map[int]*process //古希腊掌管进程的神
var containers map[string]int // 古希腊掌管容器的神
var wg sync.WaitGroup // 掌管协程
func main() {
// 检查用户身份，并添加auditd规则，监听所有syscall
if os.Geteuid() != 0 {
fmt.Printf("Err: Please run me as root, %d!\n", os.Getegid())
return
}
syscall := [5]string{"fork", "vfork", "execve", "exit", "exit_group"}
var auditCmd *exec.Cmd
auditCmd = exec.Command("auditctl", "-D") // 清空所有规则
auditCmd.Run()
// 设置监听规则
for i := 0; i < 5; i++ {
auditCmd = exec.Command("auditctl", "-a", "exit,always", "-F", "arch=b64", "-S", syscall[i])
auditCmd.Run()
}
// 查找pid
containerdPid, err := getPid()
if err != nil {
fmt.Printf("Error finding containerd: %v\n", err)
return
}
pids = make(map[int]*process)
containers = make(map[string]int)
pids[containerdPid] = &process{cmdline: "/usr/bin/cmdline", rootfs: "/", children: make([]int, 0)}
// 开始运行，解析命令行参数后监听
if err := fs.Parse(os.Args[1:]); err != nil {
log.Fatal(err)
}
if err := read(); err != nil {
log.Fatalf("error: %v", err)
}
}
func getPid() (int, error) {
// 指定要搜索的关键词
keyword := "/usr/bin/containerd"
// 获取/proc目录下的所有子目录
procDir, err := filepath.Glob("/proc/*")
if err != nil {
return 0, err
}
// 遍历子目录，查找包含关键词的进程
for _, dir := range procDir {
pid, err := strconv.Atoi(filepath.Base(dir))
if err != nil {
continue // 跳过非PID的目录
}
// 检查进程是否包含关键词
if containsKeyword(pid, keyword) {
return pid, nil
}
}
err = fmt.Errorf("Error: no containerd process found.\n")
return 0, err
}
func containsKeyword(pid int, keyword string) bool {
// 构造完整的进程命令路径
cmdPath := fmt.Sprintf("/proc/%d/cmdline", pid)
// 打开文件
file, err := os.Open(cmdPath)
if err != nil {
return false
}
defer file.Close()
// 读取文件内容
scanner := bufio.NewScanner(file)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
line := scanner.Text()
if strings.Contains(line, keyword) {
return true
}
}
return false
}
func read() error {
// Write netlink response to a file for further analysis or for writing
// tests cases.
var diagWriter io.Writer
if *diag != "" {
f, err := os.OpenFile(*diag, os.O_CREATE|os.O_RDWR|os.O_TRUNC, 0o600)
if err != nil {
return err
}
defer f.Close()
diagWriter = f
}
log.Println("starting netlink client")
var err error
var client *libaudit.AuditClient
if *receiveOnly {
client, err = libaudit.NewMulticastAuditClient(diagWriter)
if err != nil {
return fmt.Errorf("failed to create receive-only audit client: %w", err)
}
defer client.Close()
} else {
client, err = libaudit.NewAuditClient(diagWriter)
if err != nil {
return fmt.Errorf("failed to create audit client: %w", err)
}
defer client.Close()
status, err := client.GetStatus()
if err != nil {
return fmt.Errorf("failed to get audit status: %w", err)
}
log.Printf("received audit status=%+v", status)
if status.Enabled == 0 {
log.Println("enabling auditing in the kernel")
if err = client.SetEnabled(true, libaudit.WaitForReply); err != nil {
return fmt.Errorf("failed to set enabled=true: %w", err)
}
}
if status.RateLimit != uint32(*rate) {
log.Printf("setting rate limit in kernel to %v", *rate)
if err = client.SetRateLimit(uint32(*rate), libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set rate limit to unlimited: %w", err)
}
}
if status.BacklogLimit != uint32(*backlog) {
log.Printf("setting backlog limit in kernel to %v", *backlog)
if err = client.SetBacklogLimit(uint32(*backlog), libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set backlog limit: %w", err)
}
}
if status.Enabled != 2 && *immutable {
log.Printf("setting kernel settings as immutable")
if err = client.SetImmutable(libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set kernel as immutable: %w", err)
}
}
log.Printf("sending message to kernel registering our PID (%v) as the audit daemon", os.Getpid())
if err = client.SetPID(libaudit.NoWait); err != nil {
return fmt.Errorf("failed to set audit PID: %w", err)
}
}
return receive(client)
}
func receive(r *libaudit.AuditClient) error {
for {
rawEvent, err := r.Receive(false)
if err != nil {
return fmt.Errorf("receive failed: %w", err)
}
// Messages from 1300-2999 are valid audit messages.
if rawEvent.Type < auparse.AUDIT_USER_AUTH ||
rawEvent.Type > auparse.AUDIT_LAST_USER_MSG2 {
continue
}
fmt.Printf("type=%v msg=%s\n", rawEvent.Type, rawEvent.Data)
}
}
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