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probe_ktcp_sec.go
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probe_ktcp_sec.go
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package user
import (
"bytes"
"context"
"ehids/assets"
"github.com/cilium/ebpf"
manager "github.com/ehids/ebpfmanager"
"github.com/pkg/errors"
"golang.org/x/sys/unix"
"log"
"math"
)
type MTCPSecProbe struct {
Module
bpfManager *manager.Manager
bpfManagerOptions manager.Options
eventFuncMaps map[*ebpf.Map]IEventStruct
eventMaps []*ebpf.Map
}
//对象初始化
func (this *MTCPSecProbe) Init(ctx context.Context, logger *log.Logger) error {
this.Module.Init(ctx, logger)
this.Module.SetChild(this)
this.eventMaps = make([]*ebpf.Map, 0, 2)
this.eventFuncMaps = make(map[*ebpf.Map]IEventStruct)
return nil
}
func (this *MTCPSecProbe) Start() error {
if err := this.start(); err != nil {
return err
}
return nil
}
func (this *MTCPSecProbe) start() error {
// fetch ebpf assets
javaBuf, err := assets.Asset("user/bytecode/sec_socket_connect_kern.o")
if err != nil {
return errors.Wrap(err, "couldn't find asset")
}
// setup the managers
this.setupManagers()
// initialize the bootstrap manager
if err := this.bpfManager.InitWithOptions(bytes.NewReader(javaBuf), this.bpfManagerOptions); err != nil {
return errors.Wrap(err, "couldn't init manager")
}
// start the bootstrap manager
if err := this.bpfManager.Start(); err != nil {
return errors.Wrap(err, "couldn't start bootstrap manager")
}
// 加载map信息,map对应events decode表。
err = this.initDecodeFun()
if err != nil {
return err
}
return nil
}
func (this *MTCPSecProbe) Close() error {
if err := this.bpfManager.Stop(manager.CleanAll); err != nil {
return errors.Wrap(err, "couldn't stop manager")
}
return nil
}
func (this *MTCPSecProbe) setupManagers() {
this.bpfManager = &manager.Manager{
Probes: []*manager.Probe{
{
Section: "kprobe/security_socket_connect",
EbpfFuncName: "kprobe__security_socket_connect",
AttachToFuncName: "security_socket_connect",
},
},
//Ipv4Events *ebpf.Map `ebpf:"ipv4_events"`
//Ipv6Events *ebpf.Map `ebpf:"ipv6_events"`
//OtherEvents *ebpf.Map `ebpf:"other_socket_events"`
Maps: []*manager.Map{
{
Name: "ipv4_events",
},
{
Name: "ipv6_events",
},
{
Name: "other_socket_events",
},
},
}
this.bpfManagerOptions = manager.Options{
DefaultKProbeMaxActive: 512,
VerifierOptions: ebpf.CollectionOptions{
Programs: ebpf.ProgramOptions{
LogSize: 2097152,
},
},
RLimit: &unix.Rlimit{
Cur: math.MaxUint64,
Max: math.MaxUint64,
},
}
}
func (this *MTCPSecProbe) DecodeFun(em *ebpf.Map) (IEventStruct, bool) {
fun, found := this.eventFuncMaps[em]
return fun, found
}
func (this *MTCPSecProbe) initDecodeFun() error {
//eventMap 与解码函数映射
IPv4EventsMap, found, err := this.bpfManager.GetMap("ipv4_events")
if err != nil {
return err
}
if !found {
return errors.New("cant found map:events")
}
this.eventMaps = append(this.eventMaps, IPv4EventsMap)
this.eventFuncMaps[IPv4EventsMap] = &EventIPV4{}
IPv6EventsMap, found, err := this.bpfManager.GetMap("ipv6_events")
if err != nil {
return err
}
if !found {
return errors.New("cant found map:events")
}
this.eventMaps = append(this.eventMaps, IPv6EventsMap)
this.eventFuncMaps[IPv6EventsMap] = &EventIPV6{}
otherEventsMap, found, err := this.bpfManager.GetMap("other_socket_events")
if err != nil {
return err
}
if !found {
return errors.New("cant found map:events")
}
this.eventMaps = append(this.eventMaps, otherEventsMap)
this.eventFuncMaps[otherEventsMap] = &EventOther{}
return nil
}
func (this *MTCPSecProbe) Events() []*ebpf.Map {
return this.eventMaps
}
func init() {
mod := &MTCPSecProbe{}
mod.name = "EBPFProbeKTCPSec"
mod.mType = PROBE_TYPE_KPROBE
Register(mod)
}