1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
|
package main
import (
"bufio"
"flag"
"fmt"
"log"
"netlink"
"os"
"os/exec"
"strings"
"syscall"
"time"
"github.com/elastic/go-libaudit/v2"
)
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+")
)
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
}
// 所有的系统调用号与名称的关系
err := figureOutSyscalls()
if err != nil {
fmt.Printf("Error figuring out syscall numbers: %v\n", err)
}
exec.Command("auditctl", "-D").Run()
exec.Command("auditctl", "-b", "1000000000").Run()
exec.Command("auditctl", "--reset-lost").Run()
var auditCmd *exec.Cmd
pidSyscall := []string{"execve"}
// pidSyscall := []string{"fork", "vfork", "clone", "execve", "exit", "exit_group"}
// 设置监听规则
for i := 0; i < len(pidSyscall); i++ {
auditCmd = exec.Command("auditctl", "-a", "exit,always", "-F", "arch=b64", "-S", pidSyscall[i])
auditCmd.Run()
}
// 监听文件的消息
fileSyscall := []string{"open"}
// fileSyscall := []string{"open", "write", "creat", "unlink", "opendir", "mkdir", "rmdir", "chmod", "fchmod", "chown", "fchown", "lchown", "flock"}
for i := 0; i < len(fileSyscall); i++ {
auditCmd = exec.Command("auditctl", "-a", "exit,always", "-F", "arch=b64", "-S", fileSyscall[i])
auditCmd.Run()
}
// 查找pid
containerdPid, err = getPid()
if err != nil {
fmt.Printf("Error finding containerd: %v\n", err)
return
}
// 创世之神，1号进程
// 1号进程还是不要在进程树上直接出现了，不然它的小儿子们都会出现
// /usr/bin/containerd，也就是我们最关注的进程
// 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 coroutine(client *libaudit.AuditClient) {
// 各协程至此开始
rawChan = make(chan interface{})
cookedChan = make(chan Event)
wg.Add(1)
go procWatch()
wg.Add(1)
go receive(client)
wg.Add(1)
go orgnaze()
wg.Add(1)
go deal()
wg.Wait()
time.Sleep(2 * time.Second)
}
func procWatch() error {
ns, err := netlink.NewNetlinkSocket(syscall.NETLINK_CONNECTOR, 12345)
if err != nil {
fmt.Printf("Error creating socket: %v\n", err)
return err
}
defer ns.Close()
for {
res, err := ns.Receive()
if err != nil {
fmt.Printf("Error recv: %v\n", err)
continue
}
for i := 0; i < len(res); i++ {
procEvent := netlink.ParseProcEvent(res[i].Data)
switch procEvent.What {
case netlink.PROC_EVENT_FORK:
data := procEvent.Data.(netlink.ProcEventFork)
cooked := Event{
tag: NEWPID,
ppid: int(data.ParentTgid),
pid: int(data.ChildPid),
timestamp: time.Now(),
}
checkProc(&cooked)
if data.ChildPid != data.ChildTgid {
cooked.ppid = int(data.ChildTgid)
cooked.pid = int(data.ChildPid)
}
cookedChan <- cooked
case netlink.PROC_EVENT_EXIT:
data := procEvent.Data.(netlink.ProcEventExit)
cooked := Event{
tag: PIDEXIT,
timestamp: time.Now(),
pid: int(data.ProcessPid),
exit_code: uint64(data.ExitCode),
exit_signal: int(data.ExitSignal),
}
cookedChan <- cooked
default:
}
}
}
}
func checkProc(pCooked *Event) {
fileName := fmt.Sprintf("/proc/%d/cmdline", pCooked.pid)
fd, err := os.Open(fileName)
if err != nil {
fmt.Printf("Err: %v\n", err)
return
}
scanner := bufio.NewScanner(fd)
scanner.Split(bufio.ScanLines)
for scanner.Scan() {
line := scanner.Text()
pCooked.argv = append(pCooked.argv, strings.Split(line, "\x00")...)
}
pCooked.argc = len(pCooked.argv)
fd.Close()
fileName = fmt.Sprintf("/proc/%d/cwd", pCooked.pid)
pCooked.cwd, err = os.Readlink(fileName)
if err != nil {
fmt.Printf("Err readlink %s: %v\n", fileName, err)
pCooked.cwd = ""
}
}
|
