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probe_gotls.go
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probe_gotls.go
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// Copyright © 2022 Hengqi Chen
package module
import (
"bytes"
"context"
"errors"
"fmt"
"log"
"os"
"path/filepath"
"sync"
"time"
"github.com/gojue/ecapture/assets"
"github.com/gojue/ecapture/pkg/proc"
"github.com/gojue/ecapture/user/config"
"github.com/gojue/ecapture/user/event"
"github.com/cilium/ebpf"
manager "github.com/gojue/ebpfmanager"
"golang.org/x/sys/unix"
)
func init() {
mod := &GoTLSProbe{}
mod.name = ModuleNameGotls
mod.mType = ProbeTypeUprobe
Register(mod)
}
var NotGoCompiledBin = errors.New("It is not a program compiled in the Go language.")
// GoTLSProbe represents a probe for Go SSL
type GoTLSProbe struct {
MTCProbe
bpfManager *manager.Manager
bpfManagerOptions manager.Options
eventFuncMaps map[*ebpf.Map]event.IEventStruct
eventMaps []*ebpf.Map
keyloggerFilename string
keylogger *os.File
masterSecrets map[string]bool
eBPFProgramType TlsCaptureModelType
path string
isRegisterABI bool
}
func (g *GoTLSProbe) Init(ctx context.Context, l *log.Logger, cfg config.IConfig) error {
g.Module.Init(ctx, l, cfg)
g.conf = cfg
g.Module.SetChild(g)
g.eventMaps = make([]*ebpf.Map, 0, 2)
g.eventFuncMaps = make(map[*ebpf.Map]event.IEventStruct)
g.masterSecrets = make(map[string]bool)
g.path = cfg.(*config.GoTLSConfig).Path
ver, err := proc.ExtraceGoVersion(g.path)
if err != nil {
return fmt.Errorf("%s, error:%v", NotGoCompiledBin, err)
}
// supported at 1.17 via https://github.com/golang/go/issues/40724
if ver.After(1, 17) {
g.isRegisterABI = true
}
model := g.conf.(*config.GoTLSConfig).Model
switch model {
case config.TlsCaptureModelKey, config.TlsCaptureModelKeylog:
g.eBPFProgramType = TlsCaptureModelTypeKeylog
g.keyloggerFilename = g.conf.(*config.GoTLSConfig).KeylogFile
file, err := os.OpenFile(g.keyloggerFilename, os.O_APPEND|os.O_WRONLY|os.O_CREATE, 0o600)
if err != nil {
return err
}
g.keylogger = file
case config.TlsCaptureModelPcap, config.TlsCaptureModelPcapng:
pcapFile := g.conf.(*config.GoTLSConfig).PcapFile
g.eBPFProgramType = TlsCaptureModelTypePcap
fileInfo, err := filepath.Abs(pcapFile)
if err != nil {
return err
}
g.pcapngFilename = fileInfo
case config.TlsCaptureModelText:
fallthrough
default:
g.eBPFProgramType = TlsCaptureModelTypeText
g.logger.Printf("%s\tmaster key keylogger: %s\n", g.Name(), g.keyloggerFilename)
}
var ts unix.Timespec
err = unix.ClockGettime(unix.CLOCK_MONOTONIC, &ts)
if err != nil {
return err
}
startTime := ts.Nano()
bootTime := time.Now().UnixNano() - startTime
g.startTime = uint64(startTime)
g.bootTime = uint64(bootTime)
g.tcPackets = make([]*TcPacket, 0, 1024)
g.tcPacketsChan = make(chan *TcPacket, 2048)
g.tcPacketLocker = &sync.Mutex{}
g.masterKeyBuffer = bytes.NewBuffer([]byte{})
return nil
}
func (g *GoTLSProbe) Name() string {
return ModuleNameGotls
}
func (g *GoTLSProbe) Start() error {
return g.start()
}
func (g *GoTLSProbe) start() error {
var err error
switch g.eBPFProgramType {
case TlsCaptureModelTypeKeylog:
g.logger.Printf("%s\tKeylog MODEL\n", g.Name())
err = g.setupManagersKeylog()
case TlsCaptureModelTypePcap:
g.logger.Printf("%s\tPcap MODEL\n", g.Name())
err = g.setupManagersPcap()
case TlsCaptureModelTypeText:
g.logger.Printf("%s\tText MODEL\n", g.Name())
err = g.setupManagersText()
default:
g.logger.Printf("%s\tText MODEL\n", g.Name())
err = g.setupManagersText()
}
if err != nil {
return err
}
pcapFilter := g.conf.(*config.GoTLSConfig).PcapFilter
if g.eBPFProgramType == TlsCaptureModelTypePcap && pcapFilter != "" {
ebpfFuncs := []string{tcFuncNameIngress, tcFuncNameEgress}
g.bpfManager.InstructionPatchers = prepareInsnPatchers(g.bpfManager,
ebpfFuncs, pcapFilter)
}
bpfFileName := g.geteBPFName("user/bytecode/gotls_kern.o")
g.logger.Printf("%s\tBPF bytecode filename:%s\n", g.Name(), bpfFileName)
byteBuf, err := assets.Asset(bpfFileName)
if err != nil {
return err
}
if err = g.bpfManager.InitWithOptions(bytes.NewReader(byteBuf), g.bpfManagerOptions); err != nil {
var ve *ebpf.VerifierError
if errors.As(err, &ve) {
g.logger.Printf("%s\tcouldn't verify bpf prog: %+v", g.Name(), ve)
}
return fmt.Errorf("couldn't init manager %v", err)
}
// start the bootstrap manager
if err = g.bpfManager.Start(); err != nil {
return fmt.Errorf("couldn't start bootstrap manager %v .", err)
}
// 加载map信息,map对应events decode表。
switch g.eBPFProgramType {
case TlsCaptureModelTypeKeylog:
err = g.initDecodeFunKeylog()
case TlsCaptureModelTypePcap:
err = g.initDecodeFunPcap()
case TlsCaptureModelTypeText:
err = g.initDecodeFunText()
default:
err = g.initDecodeFunText()
}
if err != nil {
return err
}
return nil
}
// 通过elf的常量替换方式传递数据
func (g *GoTLSProbe) constantEditor() []manager.ConstantEditor {
editor := []manager.ConstantEditor{
{
Name: "target_pid",
Value: uint64(g.conf.GetPid()),
// FailOnMissing: true,
},
{
Name: "target_uid",
Value: uint64(g.conf.GetUid()),
},
}
if g.conf.GetPid() <= 0 {
g.logger.Printf("%s\ttarget all process. \n", g.Name())
} else {
g.logger.Printf("%s\ttarget PID:%d \n", g.Name(), g.conf.GetPid())
}
if g.conf.GetUid() <= 0 {
g.logger.Printf("%s\ttarget all users. \n", g.Name())
} else {
g.logger.Printf("%s\ttarget UID:%d \n", g.Name(), g.conf.GetUid())
}
return editor
}
func (g *GoTLSProbe) DecodeFun(m *ebpf.Map) (event.IEventStruct, bool) {
fun, found := g.eventFuncMaps[m]
return fun, found
}
func (g *GoTLSProbe) Close() error {
g.logger.Printf("%s\tclose. \n", g.Name())
if err := g.bpfManager.Stop(manager.CleanAll); err != nil {
return fmt.Errorf("couldn't stop manager %v .", err)
}
return g.Module.Close()
}
func (g *GoTLSProbe) saveMasterSecret(secretEvent *event.MasterSecretGotlsEvent) {
var label, clientRandom, secret string
label = string(secretEvent.Label[0:secretEvent.LabelLen])
clientRandom = string(secretEvent.ClientRandom[0:secretEvent.ClientRandomLen])
secret = string(secretEvent.MasterSecret[0:secretEvent.MasterSecretLen])
k := fmt.Sprintf("%s-%02x", label, clientRandom)
_, f := g.masterSecrets[k]
if f {
// 已存在该随机数的masterSecret,不需要重复写入
return
}
// TODO 保存多个lable 整组里???
// save to file
var b string
var e error
b = fmt.Sprintf("%s %02x %02x\n", label, clientRandom, secret)
switch g.eBPFProgramType {
case TlsCaptureModelTypeKeylog:
var l int
l, e = g.keylogger.WriteString(b)
if e != nil {
g.logger.Fatalf("%s: save masterSecrets to file error:%s", secretEvent.String(), e.Error())
return
}
g.logger.Printf("%s: save CLIENT_RANDOM %02x to file success, %d bytes", label, clientRandom, l)
case TlsCaptureModelTypePcap:
e = g.savePcapngSslKeyLog([]byte(b))
if e != nil {
g.logger.Fatalf("%s: save masterSecrets to pcapng error:%s", secretEvent.String(), e.Error())
return
}
default:
g.logger.Fatalf("unhandled default case with eBPF Program type:%d", g.eBPFProgramType)
}
}
func (g *GoTLSProbe) Dispatcher(eventStruct event.IEventStruct) {
// detect eventStruct type
switch eventStruct.(type) {
case *event.MasterSecretGotlsEvent:
g.saveMasterSecret(eventStruct.(*event.MasterSecretGotlsEvent))
case *event.TcSkbEvent:
err := g.dumpTcSkb(eventStruct.(*event.TcSkbEvent))
if err != nil {
g.logger.Printf("%s\tsave packet error %s .\n", g.Name(), err.Error())
}
}
}
func (g *GoTLSProbe) Events() []*ebpf.Map {
return g.eventMaps
}