out-of-tree kernel {module, exploit} development tool
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// Copyright 2018 Mikhail Klementev. All rights reserved.
// Use of this source code is governed by a AGPLv3 license
// (or later) that can be found in the LICENSE file.
package main
import (
"errors"
"fmt"
"io/ioutil"
"log"
"os"
"strings"
"time"
"gopkg.in/logrusorgru/aurora.v2"
"code.dumpstack.io/tools/out-of-tree/config"
"code.dumpstack.io/tools/out-of-tree/qemu"
)
func firstSupported(kcfg config.KernelConfig, ka config.Artifact,
kernel string) (ki config.KernelInfo, err error) {
km, err := kernelMask(kernel)
if err != nil {
return
}
ka.SupportedKernels = []config.KernelMask{km}
for _, ki = range kcfg.Kernels {
var supported bool
supported, err = ka.Supported(ki)
if err != nil || supported {
return
}
}
err = errors.New("No supported kernel found")
return
}
func handleLine(q *qemu.System) (err error) {
fmt.Print("out-of-tree> ")
rawLine := "help"
fmt.Scanf("%s", &rawLine)
params := strings.Fields(rawLine)
cmd := params[0]
switch cmd {
case "h", "help":
fmt.Printf("help\t: print this help message\n")
fmt.Printf("log\t: print qemu log\n")
fmt.Printf("clog\t: print qemu log and cleanup buffer\n")
fmt.Printf("cleanup\t: cleanup qemu log buffer\n")
fmt.Printf("ssh\t: print arguments to ssh command\n")
fmt.Printf("quit\t: quit\n")
case "l", "log":
fmt.Println(string(q.Stdout))
case "cl", "clog":
fmt.Println(string(q.Stdout))
q.Stdout = []byte{}
case "c", "cleanup":
q.Stdout = []byte{}
case "s", "ssh":
fmt.Println(q.GetSSHCommand())
case "q", "quit":
return errors.New("end of session")
default:
fmt.Println("No such command")
}
return
}
func interactive(q *qemu.System) (err error) {
for {
err = handleLine(q)
if err != nil {
return
}
}
}
func debugHandler(kcfg config.KernelConfig, workPath, kernRegex, gdb string,
dockerTimeout time.Duration, yekaslr, yesmep, yesmap, yekpti,
nokaslr, nosmep, nosmap, nokpti bool) (err error) {
ka, err := config.ReadArtifactConfig(workPath + "/.out-of-tree.toml")
if err != nil {
return
}
if ka.SourcePath == "" {
ka.SourcePath = workPath
}
ki, err := firstSupported(kcfg, ka, kernRegex)
if err != nil {
return
}
kernel := qemu.Kernel{KernelPath: ki.KernelPath, InitrdPath: ki.InitrdPath}
q, err := qemu.NewSystem(qemu.X86x64, kernel, ki.RootFS)
if err != nil {
return
}
if ka.Qemu.Cpus != 0 {
q.Cpus = ka.Qemu.Cpus
}
if ka.Qemu.Memory != 0 {
q.Memory = ka.Qemu.Memory
}
if ka.Docker.Timeout.Duration != 0 {
dockerTimeout = ka.Docker.Timeout.Duration
}
q.SetKASLR(false) // set KASLR to false by default because of gdb
q.SetSMEP(!ka.Mitigations.DisableSmep)
q.SetSMAP(!ka.Mitigations.DisableSmap)
q.SetKPTI(!ka.Mitigations.DisableKpti)
if yekaslr {
q.SetKASLR(true)
} else if nokaslr {
q.SetKASLR(false)
}
if yesmep {
q.SetSMEP(true)
} else if nosmep {
q.SetSMEP(false)
}
if yesmap {
q.SetSMAP(true)
} else if nosmap {
q.SetSMAP(false)
}
if yekpti {
q.SetKPTI(true)
} else if nokpti {
q.SetKPTI(false)
}
redgreen := func(name string, enabled bool) aurora.Value {
if enabled {
return aurora.BgGreen(aurora.Black(name))
}
return aurora.BgRed(aurora.White(name))
}
fmt.Printf("[*] %s %s %s %s\n",
redgreen("KASLR", q.GetKASLR()),
redgreen("SMEP", q.GetSMEP()),
redgreen("SMAP", q.GetSMAP()),
redgreen("KPTI", q.GetKPTI()))
fmt.Printf("[*] SMP: %d CPUs\n", q.Cpus)
fmt.Printf("[*] Memory: %d MB\n", q.Memory)
q.Debug(gdb)
coloredGdbAddress := aurora.BgGreen(aurora.Black(gdb))
fmt.Printf("[*] gdb is listening on %s\n", coloredGdbAddress)
err = q.Start()
if err != nil {
return
}
defer q.Stop()
tmp, err := ioutil.TempDir("/tmp/", "out-of-tree_")
if err != nil {
return
}
defer os.RemoveAll(tmp)
err = preloadModules(q, ka, ki, dockerTimeout)
if err != nil {
log.Println(err)
return
}
outFile, output, err := build(tmp, ka, ki, dockerTimeout)
if err != nil {
log.Println(err, output)
return
}
remoteFile := "/tmp/exploit"
if ka.Type == config.KernelModule {
remoteFile = "/tmp/module.ko"
}
err = q.CopyFile("user", outFile, remoteFile)
if err != nil {
return
}
coloredRemoteFile := aurora.BgGreen(aurora.Black(remoteFile))
fmt.Printf("[*] build result copied to %s\n", coloredRemoteFile)
fmt.Printf("\n%s\n", q.GetSSHCommand())
fmt.Printf("gdb %s -ex 'target remote %s'\n\n", ki.VmlinuxPath, gdb)
// TODO set substitute-path /build/.../linux-... /path/to/linux-source
err = interactive(q)
return
}