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pinfinder.go
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pinfinder.go
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// Copyright (c) 2017, Gareth Watts
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// * Neither the name of the <organization> nor the
// names of its contributors may be used to endorse or promote products
// derived from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
// DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
// ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
// iOS Restrictions Passcode Finder
//
// This program will examine an iTunes backup folder for an iOS device and attempt
// to find the PIN used for restricting permissions on the device (NOT the unlock PIN)
// To regenerate licenses.go:
// 1) go get github.com/gwatts/embedfiles
// 2) go generate
//go:generate embedfiles -filename licenses.go -var licenses LICENSE*
package main
import (
"bufio"
"bytes"
"crypto/sha1"
"encoding/base64"
"errors"
"flag"
"fmt"
"html/template"
"io"
"os"
"os/user"
"path"
"path/filepath"
"runtime"
"sort"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/DHowett/go-plist"
"github.com/gwatts/ios/keychain"
"github.com/howeyc/gopass"
"golang.org/x/crypto/pbkdf2"
)
const (
maxPIN = 10000
version = "1.7.1"
restrictionsPlistName = "398bc9c2aeeab4cb0c12ada0f52eea12cf14f40b"
msgIsEncrypted = "backup is encrypted"
msgEncryptionDisabled = "encrypted backups not supported"
msgNoPasscode = "none"
msgIncorrectPassword = "incorrect encryption password"
msgNoPassword = "need encryption password"
msgKeychainLoadFailed = "failed to read keychain"
msgEncryptedNeeded = "need encrypted backup"
)
var (
noPause = flag.Bool("nopause", false, "Set to true to prevent the program pausing for input on completion")
showLicense = flag.Bool("license", false, "Display license information")
diag = flag.Bool("diag", false, "Generate a diagnostic pinfinder-debug.zip file")
)
func isDir(p string) bool {
s, err := os.Stat(p)
if err != nil {
return false
}
return s.IsDir()
}
func dumpFile(fn string) {
if f, err := os.Open(fn); err != nil {
fmt.Printf("Failed to open %s: %s\n", fn, err)
} else {
defer f.Close()
io.Copy(os.Stdout, f)
}
}
func appendIfDir(dirs []string, dir string) []string {
if isDir(dir) {
return append(dirs, dir)
}
return dirs
}
// figure out where iTunes keeps its backups on the current OS
func findSyncDirs() (dirs []string, err error) {
usr, err := user.Current()
if err != nil {
return nil, fmt.Errorf("failed to get information about current user: %s", err)
}
switch runtime.GOOS {
case "darwin":
dir := filepath.Join(usr.HomeDir, "Library", "Application Support", "MobileSync", "Backup")
dirs = appendIfDir(dirs, dir)
case "windows":
// this seems to be correct for all versions of Windows.. Tested on XP and Windows 8
dir := filepath.Join(os.Getenv("APPDATA"), "Apple Computer", "MobileSync", "Backup")
dirs = appendIfDir(dirs, dir)
dir = filepath.Join(os.Getenv("USERPROFILE"), "Apple", "MobileSync", "Backup")
dirs = appendIfDir(dirs, dir)
default:
return nil, errors.New("could not detect backup directory for this operating system; pass explicitly")
}
return dirs, nil
}
func parsePlist(fn string, target interface{}) error {
f, err := os.Open(fn)
if err != nil {
return err
}
return plist.NewDecoder(f).Decode(target)
}
func fileExists(fn string) bool {
fi, err := os.Stat(fn)
if err != nil {
return false
}
return fi.Mode().IsRegular()
}
var backupInfoTpl = template.Must(template.New("backup").Parse(`
Path: {{.Path}}
Status: {{.Status}}
RestrictionPath: {{.RestrictionsPath}}
IsEncrypted: {{.Manifest.IsEncrypted}}
Key: {{.Restrictions.Key}}
Salt: {{.Restrictions.Salt}}
LastBackup: {{.Info.LastBackup}}
DisplayName: {{.Info.DisplayName}}
ProductName: {{.Info.ProductName}}
ProductType: {{.Info.ProductType}}
ProductVersion: {{.Info.ProductVersion}}
`))
type backup struct {
Path string
Status string
RestrictionsPath string
UsesScreenTime bool
Info struct {
LastBackup time.Time `plist:"Last Backup Date"`
DisplayName string `plist:"Display Name"`
ProductName string `plist:"Product Name"`
ProductType string `plist:"Product Type"`
ProductVersion string `plist:"Product Version"`
}
Manifest struct {
IsEncrypted interface{} `plist:"IsEncrypted"`
}
Restrictions struct {
Key []byte `plist:"RestrictionsPasswordKey"`
Salt []byte `plist:"RestrictionsPasswordSalt"`
}
Keychain *keychain.Keychain
}
func (b *backup) debugInfo() string {
var buf bytes.Buffer
backupInfoTpl.Execute(&buf, b)
return buf.String()
}
func (b *backup) isEncrypted() bool {
switch v := b.Manifest.IsEncrypted.(type) {
case int:
return v != 0
case uint64:
return v != 0
case bool:
return v
case nil:
return false
default:
return false
}
}
func (b *backup) isIOS12() bool {
return majorVersion(b.Info.ProductVersion) >= 12
}
type backups struct {
encrypted bool
backups []*backup
}
func (b backups) Len() int { return len(b.backups) }
func (b backups) Less(i, j int) bool {
return b.backups[i].Info.LastBackup.Before(b.backups[j].Info.LastBackup)
}
func (b backups) Swap(i, j int) { b.backups[i], b.backups[j] = b.backups[j], b.backups[i] }
func (b *backups) loadBackups(syncDir string) error {
// loop over all directories and see whether they contain an Info.plist
d, err := os.Open(syncDir)
if err != nil {
if err := isBadMacPerms(err); err != nil {
return err
}
return fmt.Errorf("failed to open directory %q: %s", syncDir, err)
}
defer d.Close()
fl, err := d.Readdir(-1)
if err != nil {
return fmt.Errorf("failed to read directory %q: %s", syncDir, err)
}
for _, fi := range fl {
if !fi.Mode().IsDir() {
continue
}
path := filepath.Join(syncDir, fi.Name())
if backup, _ := loadBackup(path); backup != nil {
b.backups = append(b.backups, backup)
if backup.isEncrypted() {
b.encrypted = true
}
}
}
sort.Sort(sort.Reverse(b))
return nil
}
func majorVersion(v string) int {
parts := strings.Split(v, ".")
if len(parts) < 1 {
return 0
}
maj, err := strconv.Atoi(parts[0])
if err != nil {
return 0
}
return maj
}
func loadBackup(backupDir string) (*backup, error) {
var b backup
if err := parsePlist(filepath.Join(backupDir, "Info.plist"), &b.Info); err != nil {
return nil, err // no Info.plist == invalid backup dir
}
if err := parsePlist(filepath.Join(backupDir, "Manifest.plist"), &b.Manifest); err != nil {
return nil, err // no Manifest.plist == invaild backup dir
}
b.Path = backupDir
switch {
case b.isIOS12():
if !b.isEncrypted() {
b.Status = msgEncryptedNeeded
return &b, nil
}
decrypt(backupDir, &b)
default:
b.RestrictionsPath = filepath.Join(backupDir, restrictionsPlistName)
if _, err := os.Stat(b.RestrictionsPath); err != nil {
// iOS 10 moved backup files into sub-folders beginning with
// the first 2 letters of the filename.
b.RestrictionsPath = filepath.Join(backupDir, restrictionsPlistName[:2], restrictionsPlistName)
}
if !fileExists(b.RestrictionsPath) {
b.Status = msgNoPasscode
return &b, nil
}
if b.isEncrypted() {
decrypt(backupDir, &b)
return &b, nil
}
if err := parsePlist(b.RestrictionsPath, &b.Restrictions); err != nil {
b.Status = err.Error()
}
}
return &b, nil
}
var prompted bool
var cachepw string
func getpw() string {
if prompted {
return cachepw
}
prompted = true
fmt.Println("\nSome backups are encrypted; passcode recovery requires the")
fmt.Println("encryption password used with iTunes. Press return to skip.")
fmt.Print("\nEnter iTunes Encryption Password: ")
pw, _ := gopass.GetPasswdMasked()
fmt.Println("")
cachepw = string(pw)
if cachepw != "" {
fmt.Println("Decryption may take a few minutes...")
}
return cachepw
}
type swg struct{ sync.WaitGroup }
func (wg *swg) WaitChan() chan struct{} {
c := make(chan struct{}, 1)
go func() {
wg.Wait()
c <- struct{}{}
}()
return c
}
// use all available cores to brute force the PIN
func findPIN(key, salt []byte) (string, error) {
found := make(chan string)
var wg swg
var start, end int
perCPU := maxPIN / runtime.NumCPU()
for i := 0; i < runtime.NumCPU(); i++ {
wg.Add(1)
if i == runtime.NumCPU()-1 {
end = maxPIN
} else {
end += perCPU
}
go func(start, end int) {
for j := start; j < end; j++ {
guess := fmt.Sprintf("%04d", j)
k := pbkdf2.Key([]byte(guess), salt, 1000, len(key), sha1.New)
if bytes.Equal(k, key) {
found <- guess
return
}
}
wg.Done()
}(start, end)
start += perCPU
}
select {
case <-wg.WaitChan():
return "", errors.New("failed to calculate PIN")
case pin := <-found:
return pin, nil
}
}
func findPINFromKeychain(b *backup) (string, error) {
items := b.Keychain.General.FindByKeyMatch(keychain.KService, "ParentalControls")
if len(items) == 0 {
return "", fmt.Errorf("none")
}
code, ok := items[0][keychain.KData].([]byte)
if !ok {
return "", fmt.Errorf(msgNoPasscode)
}
return string(code), nil
}
func exit(status int, addUsage bool, errfmt string, a ...interface{}) {
if errfmt != "" {
fmt.Fprintf(os.Stderr, errfmt+"\n", a...)
}
if addUsage {
usage()
}
if !*noPause {
fmt.Printf("Press Enter to exit")
bufio.NewReader(os.Stdin).ReadBytes('\n')
}
os.Exit(status)
}
var badMacPerms = errors.New("mac full disk access required")
func isBadMacPerms(err error) error {
if runtime.GOOS != "darwin" {
return nil
}
perr, ok := err.(*os.PathError)
if !ok || perr.Err != syscall.EPERM {
return nil
}
return badMacPerms
}
func exitBadMacPerms() {
fmt.Fprintln(os.Stderr, "\nOperation not permitted: Full Disk Access Required")
fmt.Fprintln(os.Stderr, "Please grant \"Full Disk Access\" to Terminal to run pinfinder")
fmt.Fprintln(os.Stderr, "See https://pinfinder.net/mac.html for help")
os.Exit(130)
}
func usage() {
fmt.Fprintln(os.Stderr, "Usage:", path.Base(os.Args[0]), " [flags] [<path to latest iTunes backup directory>]")
flag.PrintDefaults()
}
func init() {
flag.Usage = usage
}
func displayLicense() {
fmt.Println("LICENSE INFORMATION")
fmt.Println("-------------------")
fmt.Println()
for _, fn := range licenses.Filenames() {
fmt.Println(fn)
fmt.Println()
f, _ := licenses.Open(fn)
io.Copy(os.Stdout, f)
fmt.Println()
fmt.Println()
}
fmt.Println()
}
func generateReport(f io.Writer, includeDirName bool, allBackups *backups) {
if includeDirName {
fmt.Fprintf(f, "%-70s", "BACKUP DIR")
}
fmt.Fprintf(f, "%-35.35s %-7.7s %-25s %s\n", "IOS DEVICE", "IOS", "BACKUP TIME", "RESTRICTIONS PASSCODE")
failed := make([]*backup, 0)
for _, b := range allBackups.backups {
info := b.Info
if includeDirName {
fmt.Fprintf(f, "%-70s", filepath.Base(b.Path))
}
fmt.Fprintf(f, "%-35.35s %-7.7s %s ",
info.DisplayName,
info.ProductVersion,
info.LastBackup.In(time.Local).Format("Jan _2, 2006 03:04 PM MST"))
if b.UsesScreenTime {
pin, err := findPINFromKeychain(b)
if err != nil {
fmt.Fprintln(f, err.Error())
} else {
fmt.Fprintln(f, pin)
}
} else if len(b.Restrictions.Key) > 0 {
pin, err := findPIN(b.Restrictions.Key, b.Restrictions.Salt)
if err != nil {
fmt.Fprintln(f, "Failed to find passcode")
failed = append(failed, b)
} else {
fmt.Fprintln(f, pin)
}
} else {
fmt.Fprintln(f, b.Status)
}
}
fmt.Fprintln(f)
for _, b := range failed {
fmt.Fprintf(f, "Failed to find PIN for backup %s\nPlease file a bug report at https://github.com/gwatts/pinfinder/issues\n", b.Path)
fmt.Fprintf(f, "%-20s: %s\n", "Product Name", b.Info.ProductName)
fmt.Fprintf(f, "%-20s: %s\n", "Product Type", b.Info.ProductType)
fmt.Fprintf(f, "%-20s: %s\n", "Product Version", b.Info.ProductVersion)
fmt.Fprintf(f, "%-20s: %s\n", "Salt", base64.StdEncoding.EncodeToString(b.Restrictions.Salt))
fmt.Fprintf(f, "%-20s: %s\n", "Key", base64.StdEncoding.EncodeToString(b.Restrictions.Key))
dumpFile(b.RestrictionsPath)
fmt.Fprintln(f, "")
}
}
func donate() {
fmt.Println("| DID PINFINDER SAVE THE DAY?")
fmt.Println("| Please consider donating a few dollars to say thanks!")
fmt.Println("| https://pinfinder.net/donate")
fmt.Println("")
}
var syncDir string
func main() {
allBackups := new(backups)
fmt.Println("PIN Finder", version)
fmt.Println("iOS Restrictions Passcode Finder")
fmt.Println("https://pinfinder.net")
fmt.Println()
flag.Parse()
if *showLicense {
displayLicense()
return
}
args := flag.Args()
switch len(args) {
case 0:
syncDirs, err := findSyncDirs()
if err != nil {
exit(101, true, err.Error())
}
fmt.Println("Sync Directories:", syncDirs)
fmt.Println("Scanning backups...")
for _, syncDir := range syncDirs {
if err := allBackups.loadBackups(syncDir); err != nil {
if isBadMacPerms(err); err != nil {
exitBadMacPerms()
}
exit(101, true, err.Error())
}
}
case 1:
b, err := loadBackup(args[0])
if err != nil {
if isBadMacPerms(err); err != nil {
exitBadMacPerms()
}
exit(101, true, "Invalid backup directory")
}
allBackups = &backups{encrypted: b.isEncrypted(), backups: []*backup{b}}
default:
exit(102, true, "Too many arguments")
}
fmt.Println()
if *diag {
var buf bytes.Buffer
fmt.Println("Generating backup diagnostic report; may take a couple of minutes..")
generateReport(io.MultiWriter(os.Stdout, &buf), true, allBackups)
if fn, err := buildDebug("", buf.String(), allBackups); err != nil {
exit(110, false, err.Error())
} else {
fmt.Println("Generated diagnostic report file stored at", fn)
exit(0, false, "")
}
}
generateReport(os.Stdout, false, allBackups)
donate()
exit(0, false, "")
}