pax_global_header00006660000000000000000000000064140715271640014521gustar00rootroot0000000000000052 comment=7624b5b22860dfa22aebc275bf29024e220c3312 apksigcopier-1.0.1/000077500000000000000000000000001407152716400142005ustar00rootroot00000000000000apksigcopier-1.0.1/.flake8000066400000000000000000000000271407152716400153520ustar00rootroot00000000000000[flake8] ignore = E501 apksigcopier-1.0.1/.github/000077500000000000000000000000001407152716400155405ustar00rootroot00000000000000apksigcopier-1.0.1/.github/workflows/000077500000000000000000000000001407152716400175755ustar00rootroot00000000000000apksigcopier-1.0.1/.github/workflows/ci.yml000066400000000000000000000142621407152716400207200ustar00rootroot00000000000000name: CI on: [push, pull_request, workflow_dispatch] jobs: build: runs-on: ubuntu-20.04 strategy: matrix: python-version: - 3.5 - 3.6 - 3.7 - 3.8 - 3.9 - '3.10.0-alpha - 3.10' - pypy3 steps: - uses: actions/checkout@v2 - name: Set up Python ${{ matrix.python-version }} uses: actions/setup-python@v2 with: python-version: ${{ matrix.python-version }} - name: Install dependencies run: | sudo apt-get update || sudo apt-get update # sudo apt-get upgrade -y sudo apt-get install -y openjdk-8-jdk-headless sudo apt-get remove -y adoptopenjdk-8-hotspot adoptopenjdk-11-hotspot sudo apt-get install -y apksigner python3 -m pip install --upgrade pip python3 -m pip install flake8 pylint - name: Install mypy run: python3 -m pip install mypy continue-on-error: ${{ contains(matrix.python-version, 'alpha') || contains(matrix.python-version, 'pypy') }} - name: Install run: make install - name: Test & lint run: make test-cli lint - name: Extra lint run: make lint-extra continue-on-error: ${{ contains(matrix.python-version, 'alpha') || contains(matrix.python-version, 'pypy') || matrix.python-version == '3.5' }} - name: Cache NewPipe build uses: actions/cache@v2 with: path: | app-release-unsigned-zipflinger.apk app-release-unsigned.apk key: v0.21.0-20210615 - name: Cache NewPipe downloads uses: actions/cache@v2 with: path: | NewPipe_v0.21.0.apk org.schabi.newpipe_966.apk key: v0.21.0-20210615 - name: Build NewPipe run: | set -x if [ ! -e app-release-unsigned.apk ]; then unset JAVA_HOME git clone -b v0.21.0 https://github.com/TeamNewPipe/NewPipe.git cd NewPipe ./gradlew assembleRelease mv app/build/outputs/apk/release/app-release-unsigned.apk \ ../app-release-unsigned-zipflinger.apk printf '\nandroid.useNewApkCreator=false\n' >> gradle.properties ./gradlew clean ./gradlew assembleRelease mv app/build/outputs/apk/release/app-release-unsigned.apk ../ cd .. fi - name: Copy APK run: | set -x cp app-release-unsigned.apk signed.apk cp app-release-unsigned.apk signed-v1.apk cp app-release-unsigned.apk signed-jarsigner.apk cp app-release-unsigned-zipflinger.apk signed-zipflinger.apk cp app-release-unsigned-zipflinger.apk signed-zipflinger-v1.apk - name: Generate dummy keystore & sign APKs run: | set -x keytool -genkey -keystore ci-ks -alias dummy -keyalg RSA \ -keysize 4096 -sigalg SHA512withRSA -validity 10000 \ -storepass dummy-password -dname CN=dummy apksigner sign -v --ks ci-ks --ks-key-alias dummy \ --ks-pass pass:dummy-password signed.apk apksigner sign -v --ks ci-ks --ks-key-alias dummy \ --ks-pass pass:dummy-password \ --v2-signing-enabled=false --v3-signing-enabled=false signed-v1.apk PASS=dummy-password jarsigner -keystore ci-ks -storepass:env PASS \ -sigalg SHA256withRSA -digestalg SHA-256 signed-jarsigner.apk dummy apksigner sign -v --ks ci-ks --ks-key-alias dummy \ --ks-pass pass:dummy-password signed-zipflinger.apk apksigner sign -v --ks ci-ks --ks-key-alias dummy \ --ks-pass pass:dummy-password \ --v2-signing-enabled=false --v3-signing-enabled=false signed-zipflinger-v1.apk - name: Copy signatures run: | set -x mkdir meta meta-zipflinger apksigcopier extract signed.apk meta apksigcopier extract signed-zipflinger.apk meta-zipflinger ls -hlA meta meta-zipflinger apksigcopier patch meta app-release-unsigned.apk patched.apk apksigcopier copy signed.apk app-release-unsigned.apk copied.apk apksigcopier copy --v1-only=auto signed-v1.apk \ app-release-unsigned.apk copied-v1.apk apksigcopier copy --v1-only=yes signed-jarsigner.apk \ app-release-unsigned.apk copied-jarsigner.apk apksigcopier patch meta-zipflinger \ app-release-unsigned-zipflinger.apk patched-zipflinger.apk apksigcopier copy signed-zipflinger.apk \ app-release-unsigned-zipflinger.apk copied-zipflinger.apk apksigcopier copy --v1-only=auto signed-zipflinger-v1.apk \ app-release-unsigned-zipflinger.apk copied-zipflinger-v1.apk - name: Compare APKs run: | set -x sha512sum *.apk | sort cmp signed.apk patched.apk cmp signed.apk copied.apk cmp signed-v1.apk copied-v1.apk cmp signed-jarsigner.apk copied-jarsigner.apk || true cmp signed-zipflinger.apk patched-zipflinger.apk cmp signed-zipflinger.apk copied-zipflinger.apk cmp signed-zipflinger-v1.apk copied-zipflinger-v1.apk - name: Verify APKs run: | set -x for apk in signed*.apk patched*.apk copied*.apk; do apksigner verify -v --print-certs "$apk" | grep -v ^WARNING: done - name: Download & verify F-Droid & upstream APKs run: | set -x [ -e NewPipe_v0.21.0.apk ] || wget -O NewPipe_v0.21.0.apk -- \ https://github.com/TeamNewPipe/NewPipe/releases/download/v0.21.0/NewPipe_v0.21.0.apk [ -e org.schabi.newpipe_966.apk ] || wget -O org.schabi.newpipe_966.apk -- \ https://web.archive.org/web/20210618174010/https://f-droid.org/archive/org.schabi.newpipe_966.apk for apk in NewPipe_v0.21.0.apk org.schabi.newpipe_966.apk; do apksigner verify -v --print-certs "$apk" | grep -v ^WARNING: done # FIXME: not actually RB :( - name: apksigcopier compare run: | set -x apksigcopier compare NewPipe_v0.21.0.apk org.schabi.newpipe_966.apk apksigcopier compare NewPipe_v0.21.0.apk signed-zipflinger.apk || true apksigcopier compare NewPipe_v0.21.0.apk \ --unsigned app-release-unsigned-zipflinger.apk || true apksigcopier-1.0.1/.gitignore000066400000000000000000000001261407152716400161670ustar00rootroot00000000000000__pycache__ /build /dist /apksigcopier.egg-info .coverage /htmlcov /apksigcopier.1 apksigcopier-1.0.1/.pylintrc000066400000000000000000000001361407152716400160450ustar00rootroot00000000000000[MESSAGES CONTROL] confidence=HIGH,INFERENCE disable=invalid-name,missing-docstring,no-member apksigcopier-1.0.1/LICENSE.GPLv3000066400000000000000000001045151407152716400161050ustar00rootroot00000000000000 GNU GENERAL PUBLIC LICENSE Version 3, 29 June 2007 Copyright (C) 2007 Free Software Foundation, Inc. Everyone is permitted to copy and distribute verbatim copies of this license document, but changing it is not allowed. Preamble The GNU General Public License is a free, copyleft license for software and other kinds of works. The licenses for most software and other practical works are designed to take away your freedom to share and change the works. By contrast, the GNU General Public License is intended to guarantee your freedom to share and change all versions of a program--to make sure it remains free software for all its users. We, the Free Software Foundation, use the GNU General Public License for most of our software; it applies also to any other work released this way by its authors. You can apply it to your programs, too. When we speak of free software, we are referring to freedom, not price. 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But first, please read . apksigcopier-1.0.1/MANIFEST.in000066400000000000000000000000471407152716400157370ustar00rootroot00000000000000include LICENSE.GPLv3 include Makefile apksigcopier-1.0.1/Makefile000066400000000000000000000015071407152716400156430ustar00rootroot00000000000000SHELL := /bin/bash PYTHON ?= python3 export PYTHONWARNINGS := default .PHONY: all install test test-cli lint lint-extra clean cleanup all: apksigcopier.1 install: $(PYTHON) -mpip install -e . test: test-cli lint lint-extra test-cli: # TODO apksigcopier --version $(PYTHON) -m doctest apksigcopier lint: flake8 apksigcopier.py pylint apksigcopier.py lint-extra: mypy apksigcopier.py clean: cleanup rm -fr apksigcopier.egg-info/ cleanup: find -name '*~' -delete -print rm -fr __pycache__/ .mypy_cache/ rm -fr build/ dist/ rm -fr .coverage htmlcov/ rm -fr apksigcopier.1 %.1: %.1.md pandoc -s -t man -o $@ $< .PHONY: _package _publish _package: $(PYTHON) setup.py sdist bdist_wheel twine check dist/* _publish: cleanup _package read -r -p "Are you sure? "; \ [[ "$$REPLY" == [Yy]* ]] && twine upload dist/* apksigcopier-1.0.1/README.md000066400000000000000000000132001407152716400154530ustar00rootroot00000000000000 [![GitHub Release](https://img.shields.io/github/release/obfusk/apksigcopier.svg?logo=github)](https://github.com/obfusk/apksigcopier/releases) [![PyPI Version](https://img.shields.io/pypi/v/apksigcopier.svg)](https://pypi.python.org/pypi/apksigcopier) [![Python Versions](https://img.shields.io/pypi/pyversions/apksigcopier.svg)](https://pypi.python.org/pypi/apksigcopier) [![CI](https://github.com/obfusk/apksigcopier/workflows/CI/badge.svg)](https://github.com/obfusk/apksigcopier/actions?query=workflow%3ACI) [![GPLv3+](https://img.shields.io/badge/license-GPLv3+-blue.svg)](https://www.gnu.org/licenses/gpl-3.0.html) Packaging status Packaging status # apksigcopier ## copy/extract/patch android apk signatures & compare apks `apksigcopier` is a tool for copying android APK signatures from a signed APK to an unsigned one (in order to verify [reproducible builds](https://f-droid.org/docs/Reproducible_Builds/)). It can also be used to compare two APKs with different signatures. Its command-line tool offers four operations: * copy signatures directly from a signed to an unsigned APK * extract signatures from a signed APK to a directory * patch previously extracted signatures onto an unsigned APK * compare two APKs with different signatures ### Extract ```bash $ mkdir meta $ apksigcopier extract signed.apk meta $ ls -1 meta 8BEA2A77.RSA 8BEA2A77.SF APKSigningBlock APKSigningBlockOffset MANIFEST.MF ``` ### Patch ```bash $ apksigcopier patch meta unsigned.apk out.apk ``` ### Copy (Extract & Patch) ```bash $ apksigcopier copy signed.apk unsigned.apk out.apk ``` ### Compare This command requires `apksigner`. ```bash $ apksigcopier compare foo-from-fdroid.apk foo-built-locally.apk $ apksigcopier compare --unsigned foo.apk foo-unsigned.apk ``` ### Help ```bash $ apksigcopier --help $ apksigcopier copy --help # extract --help, patch --help, etc. $ man apksigcopier # requires the man page to be installed ``` ### Environment Variables The following environment variables can be set to `1`, `yes`, or `true` to override the default behaviour: * set `APKSIGCOPIER_EXCLUDE_ALL_META=1` to exclude all metadata files * set `APKSIGCOPIER_COPY_EXTRA_BYTES=1` to copy extra bytes after data (e.g. a v2 sig) ## Python API ```python >>> from apksigcopier import do_extract, do_patch, do_copy, do_compare >>> do_extract(signed_apk, output_dir, v1_only=NO) >>> do_patch(metadata_dir, unsigned_apk, output_apk, v1_only=NO) >>> do_copy(signed_apk, unsigned_apk, output_apk, v1_only=NO) >>> do_compare(first_apk, second_apk, unsigned=False) ``` You can use `False`, `None`, and `True` instead of `NO`, `AUTO`, and `YES` respectively. The following global variables (which default to `False`), can be set to override the default behaviour: * set `exclude_all_meta=True` to exclude all metadata files * set `copy_extra_bytes=True` to copy extra bytes after data (e.g. a v2 sig) ## FAQ ### What kind of signatures does apksigcopier support? It currently supports v1 + v2 + v3 (which is a variant of v2). It should also support v4, since these are stored in a separate file (and require a complementary v2/v3 signature). When using the `extract` command, the v2/v3 signature is saved as `APKSigningBlock` + `APKSigningBlockOffset`. ## Tab Completion For Bash, add this to `~/.bashrc`: ```bash eval "$(_APKSIGCOPIER_COMPLETE=source_bash apksigcopier)" ``` For Zsh, add this to `~/.zshrc`: ```zsh eval "$(_APKSIGCOPIER_COMPLETE=source_zsh apksigcopier)" ``` For Fish, add this to `~/.config/fish/completions/apksigcopier.fish`: ```fish eval (env _APKSIGCOPIER_COMPLETE=source_fish apksigcopier) ``` ## Requirements * Python >= 3.5 + click. * The `compare` command also requires `apksigner`. ### Debian/Ubuntu ```bash $ apt install python3-click $ apt install apksigner # only needed for the compare command ``` ## Installing ### Debian An official package is [available in Debian unstable](https://packages.debian.org/unstable/apksigcopier): ```bash $ apt install apksigcopier ``` You can also manually build a Debian package using the `debian/sid` branch, or download a pre-built `.deb` via GitHub releases. ### NixOS & Arch Linux Official packages are also available in [nixpkgs unstable](https://github.com/NixOS/nixpkgs/blob/master/pkgs/development/tools/apksigcopier/default.nix) and [Arch Linux](https://archlinux.org/packages/community/any/apksigcopier/) (and derivatives). ### Using pip ```bash $ pip install apksigcopier ``` NB: depending on your system you may need to use e.g. `pip3 --user` instead of just `pip`. ### From git NB: this installs the latest development version, not the latest release. ```bash $ git clone https://github.com/obfusk/apksigcopier.git $ cd apksigcopier $ pip install -e . ``` NB: you may need to add e.g. `~/.local/bin` to your `$PATH` in order to run `apksigcopier`. To update to the latest development version: ```bash $ cd apksigcopier $ git pull --rebase ``` ## License [![GPLv3+](https://www.gnu.org/graphics/gplv3-127x51.png)](https://www.gnu.org/licenses/gpl-3.0.html) apksigcopier-1.0.1/apksigcopier000077500000000000000000000561031407152716400166130ustar00rootroot00000000000000#!/usr/bin/python3 # encoding: utf-8 # SPDX-FileCopyrightText: 2021 Felix C. Stegerman # SPDX-License-Identifier: GPL-3.0-or-later # -- ; {{{1 # # File : apksigcopier # Maintainer : Felix C. Stegerman # Date : 2021-07-08 # # Copyright : Copyright (C) 2021 Felix C. Stegerman # Version : v1.0.1 # License : GPLv3+ # # -- ; }}}1 """ copy/extract/patch android apk signatures & compare apks apksigcopier is a tool for copying android APK signatures from a signed APK to an unsigned one (in order to verify reproducible builds). It can also be used to compare two APKs with different signatures; this requires apksigner. CLI === $ apksigcopier extract [OPTIONS] SIGNED_APK OUTPUT_DIR $ apksigcopier patch [OPTIONS] METADATA_DIR UNSIGNED_APK OUTPUT_APK $ apksigcopier copy [OPTIONS] SIGNED_APK UNSIGNED_APK OUTPUT_APK $ apksigcopier compare [OPTIONS] FIRST_APK SECOND_APK The following environment variables can be set to 1, yes, or true to override the default behaviour: * set APKSIGCOPIER_EXCLUDE_ALL_META=1 to exclude all metadata files * set APKSIGCOPIER_COPY_EXTRA_BYTES=1 to copy extra bytes after data (e.g. a v2 sig) API === >> from apksigcopier import do_extract, do_patch, do_copy, do_compare >> do_extract(signed_apk, output_dir, v1_only=NO) >> do_patch(metadata_dir, unsigned_apk, output_apk, v1_only=NO) >> do_copy(signed_apk, unsigned_apk, output_apk, v1_only=NO) >> do_compare(first_apk, second_apk, unsigned=False) You can use False, None, and True instead of NO, AUTO, and YES respectively. The following global variables (which default to False), can be set to override the default behaviour: * set exclude_all_meta=True to exclude all metadata files * set copy_extra_bytes=True to copy extra bytes after data (e.g. a v2 sig) """ import glob import os import re import struct import subprocess import sys import tempfile import zipfile import zlib from collections import namedtuple from typing import Any, Dict __version__ = "1.0.1" NAME = "apksigcopier" SIGBLOCK, SIGOFFSET = "APKSigningBlock", "APKSigningBlockOffset" NOAUTOYES = NO, AUTO, YES = ("no", "auto", "yes") APK_META = re.compile(r"^META-INF/([0-9A-Za-z_-]+\.(SF|RSA|DSA|EC)|MANIFEST\.MF)$") META_EXT = ("SF", "RSA|DSA|EC", "MF") COPY_EXCLUDE = ("META-INF/MANIFEST.MF",) DATETIMEZERO = (1980, 0, 0, 0, 0, 0) VERIFY_CMD = ("apksigner", "verify", "--") ZipData = namedtuple("ZipData", ("cd_offset", "eocd_offset", "cd_and_eocd")) exclude_all_meta = False # exclude all metadata files in copy_apk() copy_extra_bytes = False # copy extra bytes after data in copy_apk() class APKSigCopierError(Exception): """Base class for errors.""" class APKSigningBlockError(APKSigCopierError): """Something wrong with the APK Signing Block.""" class NoAPKSigningBlock(APKSigningBlockError): """APK Signing Block Missing.""" class ZipError(APKSigCopierError): """Something wrong with ZIP file.""" # FIXME: is there a better alternative? class ReproducibleZipInfo(zipfile.ZipInfo): """Reproducible ZipInfo hack.""" _override = {} # type: Dict[str, Any] def __init__(self, zinfo, **override): if override: self._override = {**self._override, **override} for k in self.__slots__: if hasattr(zinfo, k): setattr(self, k, getattr(zinfo, k)) def __getattribute__(self, name): if name != "_override": try: return self._override[name] except KeyError: pass return object.__getattribute__(self, name) class APKZipInfo(ReproducibleZipInfo): """Reproducible ZipInfo for APK files.""" _override = dict( compress_type=8, create_system=0, create_version=20, date_time=DATETIMEZERO, external_attr=0, extract_version=20, flag_bits=0x800, ) def noautoyes(value): """ Turns False into NO, None into AUTO, and True into YES. >>> from apksigcopier import noautoyes, NO, AUTO, YES >>> noautoyes(False) == NO == noautoyes(NO) True >>> noautoyes(None) == AUTO == noautoyes(AUTO) True >>> noautoyes(True) == YES == noautoyes(YES) True """ if isinstance(value, str): if value not in NOAUTOYES: raise ValueError("expected NO, AUTO, or YES") return value try: return {False: NO, None: AUTO, True: YES}[value] except KeyError: raise ValueError("expected False, None, or True") def is_meta(filename): """ Returns whether filename is a v1 (JAR) signature file (.SF), signature block file (.RSA, .DSA, or .EC), or manifest (MANIFEST.MF). See https://docs.oracle.com/javase/tutorial/deployment/jar/intro.html """ return APK_META.fullmatch(filename) is not None def exclude_from_copying(filename): """ Returns whether to exclude a file during copy_apk(). Excludes filenames in COPY_EXCLUDE (i.e. MANIFEST.MF) by default; when exclude_all_meta is set to True instead, excludes all metadata files as matched by is_meta(). """ return is_meta(filename) if exclude_all_meta else filename in COPY_EXCLUDE ################################################################################ # # https://en.wikipedia.org/wiki/ZIP_(file_format) # https://source.android.com/security/apksigning/v2#apk-signing-block-format # # ================================= # | Contents of ZIP entries | # ================================= # | APK Signing Block | # | ----------------------------- | # | | size (w/o this) uint64 LE | | # | | ... | | # | | size (again) uint64 LE | | # | | "APK Sig Block 42" (16B) | | # | ----------------------------- | # ================================= # | ZIP Central Directory | # ================================= # | ZIP End of Central Directory | # | ----------------------------- | # | | 0x06054b50 ( 4B) | | # | | ... (12B) | | # | | CD Offset ( 4B) | | # | | ... | | # | ----------------------------- | # ================================= # ################################################################################ # FIXME: makes certain assumptions and doesn't handle all valid ZIP files! def copy_apk(unsigned_apk, output_apk): """ Copy APK like apksigner would, excluding files matched by exclude_from_copying(). Returns max date_time. The following global variables (which default to False), can be set to override the default behaviour: * set exclude_all_meta=True to exclude all metadata files * set copy_extra_bytes=True to copy extra bytes after data (e.g. a v2 sig) """ with zipfile.ZipFile(unsigned_apk, "r") as zf: infos = zf.infolist() zdata = zip_data(unsigned_apk) offsets = {} with open(unsigned_apk, "rb") as fhi, open(output_apk, "w+b") as fho: for info in sorted(infos, key=lambda info: info.header_offset): off_i = fhi.tell() if info.header_offset > off_i: # copy extra bytes fho.write(fhi.read(info.header_offset - off_i)) hdr = fhi.read(30) if hdr[:4] != b"\x50\x4b\x03\x04": raise ZipError("Expected local file header signature") n, m = struct.unpack("= 4: hdr_id, size = struct.unpack(" len(old_xtr) - 4: break if not (hdr_id == 0 and size == 0): if hdr_id == 0xd935: if size >= 2: align = int.from_bytes(old_xtr[4:6], "little") else: new_xtr += old_xtr[:size + 4] old_xtr = old_xtr[size + 4:] if old_off % align == 0 and new_off % align != 0: pad = (align - (new_off - m + len(new_xtr) + 6) % align) % align xtr = new_xtr + struct.pack(" 0: data = fhi.read(min(size, blocksize)) if not data: break size -= len(data) fho.write(data) if size != 0: raise ZipError("Unexpected EOF") def extract_meta(signed_apk): """ Extract v1 signature metadata files from signed APK. Yields (ZipInfo, data) pairs. """ with zipfile.ZipFile(signed_apk, "r") as zf_sig: for info in zf_sig.infolist(): if is_meta(info.filename): yield info, zf_sig.read(info.filename) def patch_meta(extracted_meta, output_apk, date_time=DATETIMEZERO): """Add v1 signature metadata to APK (removes v2 sig block, if any).""" with zipfile.ZipFile(output_apk, "r") as zf_out: for info in zf_out.infolist(): if is_meta(info.filename): raise ZipError("Unexpected metadata") with zipfile.ZipFile(output_apk, "a") as zf_out: info_data = [(APKZipInfo(info, date_time=date_time), data) for info, data in extracted_meta] _write_to_zip(info_data, zf_out) if sys.version_info >= (3, 7): def _write_to_zip(info_data, zf_out): for info, data in info_data: zf_out.writestr(info, data, compresslevel=9) else: def _write_to_zip(info_data, zf_out): old = zipfile._get_compressor zipfile._get_compressor = lambda _: zlib.compressobj(9, 8, -15) try: for info, data in info_data: zf_out.writestr(info, data) finally: zipfile._get_compressor = old def extract_v2_sig(apkfile, expected=True): """ Extract APK Signing Block and offset from APK. When successful, returns (sb_offset, sig_block); otherwise raises NoAPKSigningBlock when expected is True, else returns None. """ cd_offset = zip_data(apkfile).cd_offset with open(apkfile, "rb") as fh: fh.seek(cd_offset - 16) if fh.read(16) != b"APK Sig Block 42": if expected: raise NoAPKSigningBlock("No APK Signing Block") return None fh.seek(-24, os.SEEK_CUR) sb_size2 = int.from_bytes(fh.read(8), "little") fh.seek(-sb_size2 + 8, os.SEEK_CUR) sb_size1 = int.from_bytes(fh.read(8), "little") if sb_size1 != sb_size2: raise APKSigningBlockError("APK Signing Block sizes not equal") fh.seek(-8, os.SEEK_CUR) sb_offset = fh.tell() sig_block = fh.read(sb_size2 + 8) return sb_offset, sig_block def zip_data(apkfile, count=1024): """ Extract central directory, EOCD, and offsets from ZIP. Returns ZipData. """ with open(apkfile, "rb") as fh: fh.seek(-count, os.SEEK_END) data = fh.read() pos = data.rfind(b"\x50\x4b\x05\x06") if pos == -1: raise ZipError("Expected end of central directory record (EOCD)") fh.seek(pos - len(data), os.SEEK_CUR) eocd_offset = fh.tell() fh.seek(16, os.SEEK_CUR) cd_offset = int.from_bytes(fh.read(4), "little") fh.seek(cd_offset) cd_and_eocd = fh.read() return ZipData(cd_offset, eocd_offset, cd_and_eocd) # FIXME: can we determine signed_sb_offset? def patch_v2_sig(extracted_v2_sig, output_apk): """Implant extracted v2/v3 signature into APK.""" signed_sb_offset, signed_sb = extracted_v2_sig data_out = zip_data(output_apk) if signed_sb_offset < data_out.cd_offset: raise APKSigningBlockError("APK Signing Block offset < central directory offset") padding = b"\x00" * (signed_sb_offset - data_out.cd_offset) offset = len(signed_sb) + len(padding) with open(output_apk, "r+b") as fh: fh.seek(data_out.cd_offset) fh.write(padding) fh.write(signed_sb) fh.write(data_out.cd_and_eocd) fh.seek(data_out.eocd_offset + offset + 16) fh.write(int.to_bytes(data_out.cd_offset + offset, 4, "little")) def patch_apk(extracted_meta, extracted_v2_sig, unsigned_apk, output_apk): """ Patch extracted_meta + extracted_v2_sig (if not None) onto unsigned_apk and save as output_apk. """ date_time = copy_apk(unsigned_apk, output_apk) patch_meta(extracted_meta, output_apk, date_time=date_time) if extracted_v2_sig is not None: patch_v2_sig(extracted_v2_sig, output_apk) def verify_apk(apk): """Verifies APK using apksigner.""" try: subprocess.run(VERIFY_CMD + (apk,), check=True, stdout=subprocess.PIPE) except subprocess.CalledProcessError: raise APKSigCopierError("failed to verify " + apk) except FileNotFoundError: raise APKSigCopierError("{} command not found".format(VERIFY_CMD[0])) def do_extract(signed_apk, output_dir, v1_only=NO): """ Extract signatures from signed_apk and save in output_dir. The v1_only parameter controls whether the absence of a v1 signature is considered an error or not: * use v1_only=NO (or v1_only=False) to only accept (v1+)v2/v3 signatures; * use v1_only=AUTO (or v1_only=None) to automatically detect v2/v3 signatures; * use v1_only=YES (or v1_only=True) to ignore any v2/v3 signatures. """ v1_only = noautoyes(v1_only) extracted_meta = tuple(extract_meta(signed_apk)) if len(extracted_meta) not in (len(META_EXT), 0): raise APKSigCopierError("Unexpected or missing metadata files in signed_apk") for info, data in extracted_meta: name = os.path.basename(info.filename) with open(os.path.join(output_dir, name), "wb") as fh: fh.write(data) if v1_only == YES: if not extracted_meta: raise APKSigCopierError("Expected v1 signature") return expected = v1_only == NO extracted_v2_sig = extract_v2_sig(signed_apk, expected=expected) if extracted_v2_sig is None: if not extracted_meta: raise APKSigCopierError("Expected v1 and/or v2/v3 signature, found neither") return signed_sb_offset, signed_sb = extracted_v2_sig with open(os.path.join(output_dir, SIGOFFSET), "w") as fh: fh.write(str(signed_sb_offset) + "\n") with open(os.path.join(output_dir, SIGBLOCK), "wb") as fh: fh.write(signed_sb) def do_patch(metadata_dir, unsigned_apk, output_apk, v1_only=NO): """ Patch signatures from metadata_dir onto unsigned_apk and save as output_apk. The v1_only parameter controls whether the absence of a v1 signature is considered an error or not: * use v1_only=NO (or v1_only=False) to only accept (v1+)v2/v3 signatures; * use v1_only=AUTO (or v1_only=None) to automatically detect v2/v3 signatures; * use v1_only=YES (or v1_only=True) to ignore any v2/v3 signatures. """ v1_only = noautoyes(v1_only) extracted_meta = [] for pat in META_EXT: files = [fn for ext in pat.split("|") for fn in glob.glob(os.path.join(metadata_dir, "*." + ext))] if len(files) != 1: continue info = zipfile.ZipInfo("META-INF/" + os.path.basename(files[0])) with open(files[0], "rb") as fh: extracted_meta.append((info, fh.read())) if len(extracted_meta) not in (len(META_EXT), 0): raise APKSigCopierError("Unexpected or missing files in metadata_dir") if v1_only == YES: extracted_v2_sig = None else: sigoffset_file = os.path.join(metadata_dir, SIGOFFSET) sigblock_file = os.path.join(metadata_dir, SIGBLOCK) if v1_only == AUTO and not os.path.exists(sigblock_file): extracted_v2_sig = None else: with open(sigoffset_file, "r") as fh: signed_sb_offset = int(fh.read()) with open(sigblock_file, "rb") as fh: signed_sb = fh.read() extracted_v2_sig = signed_sb_offset, signed_sb if not extracted_meta and extracted_v2_sig is None: raise APKSigCopierError("Expected v1 and/or v2/v3 signature, found neither") patch_apk(extracted_meta, extracted_v2_sig, unsigned_apk, output_apk) def do_copy(signed_apk, unsigned_apk, output_apk, v1_only=NO): """ Copy signatures from signed_apk onto unsigned_apk and save as output_apk. The v1_only parameter controls whether the absence of a v1 signature is considered an error or not: * use v1_only=NO (or v1_only=False) to only accept (v1+)v2/v3 signatures; * use v1_only=AUTO (or v1_only=None) to automatically detect v2/v3 signatures; * use v1_only=YES (or v1_only=True) to ignore any v2/v3 signatures. """ v1_only = noautoyes(v1_only) extracted_meta = extract_meta(signed_apk) if v1_only == YES: extracted_v2_sig = None else: extracted_v2_sig = extract_v2_sig(signed_apk, expected=v1_only == NO) patch_apk(extracted_meta, extracted_v2_sig, unsigned_apk, output_apk) def do_compare(first_apk, second_apk, unsigned=False): """ Compare first_apk to second_apk by: * using apksigner to check if the first APK verifies * checking if the second APK also verifies (unless unsigned is True) * copying the signature from first_apk to a copy of second_apk * checking if the resulting APK verifies """ global exclude_all_meta verify_apk(first_apk) if not unsigned: verify_apk(second_apk) with tempfile.TemporaryDirectory() as tmpdir: output_apk = os.path.join(tmpdir, "output.apk") # FIXME old_exclude_all_meta = exclude_all_meta # FIXME exclude_all_meta = not unsigned try: do_copy(first_apk, second_apk, output_apk, AUTO) finally: exclude_all_meta = old_exclude_all_meta verify_apk(output_apk) def main(): """CLI; requires click.""" global exclude_all_meta, copy_extra_bytes exclude_all_meta = os.environ.get("APKSIGCOPIER_EXCLUDE_ALL_META") in ("1", "yes", "true") copy_extra_bytes = os.environ.get("APKSIGCOPIER_COPY_EXTRA_BYTES") in ("1", "yes", "true") import click NAY = click.Choice(NOAUTOYES) @click.group(help=""" apksigcopier - copy/extract/patch android apk signatures & compare apks """) @click.version_option(__version__) def cli(): pass @cli.command(help=""" Extract APK signatures from signed APK. """) @click.option("--v1-only", type=NAY, default=NO, show_default=True, envvar="APKSIGCOPIER_V1_ONLY") @click.argument("signed_apk", type=click.Path(exists=True, dir_okay=False)) @click.argument("output_dir", type=click.Path(exists=True, file_okay=False)) def extract(*args, **kwargs): do_extract(*args, **kwargs) @cli.command(help=""" Patch extracted APK signatures onto unsigned APK. """) @click.option("--v1-only", type=NAY, default=NO, show_default=True, envvar="APKSIGCOPIER_V1_ONLY") @click.argument("metadata_dir", type=click.Path(exists=True, file_okay=False)) @click.argument("unsigned_apk", type=click.Path(exists=True, dir_okay=False)) @click.argument("output_apk", type=click.Path(dir_okay=False)) def patch(*args, **kwargs): do_patch(*args, **kwargs) @cli.command(help=""" Copy (extract & patch) signatures from signed to unsigned APK. """) @click.option("--v1-only", type=NAY, default=NO, show_default=True, envvar="APKSIGCOPIER_V1_ONLY") @click.argument("signed_apk", type=click.Path(exists=True, dir_okay=False)) @click.argument("unsigned_apk", type=click.Path(exists=True, dir_okay=False)) @click.argument("output_apk", type=click.Path(dir_okay=False)) def copy(*args, **kwargs): do_copy(*args, **kwargs) @cli.command(help=""" Compare two APKs by copying the signature from the first to a copy of the second and checking if the resulting APK verifies. This command requires apksigner. """) @click.option("--unsigned", is_flag=True, help="Accept unsigned SECOND_APK.") @click.argument("first_apk", type=click.Path(exists=True, dir_okay=False)) @click.argument("second_apk", type=click.Path(exists=True, dir_okay=False)) def compare(*args, **kwargs): do_compare(*args, **kwargs) # FIXME if click.__version__.startswith("7."): def autocomplete_path(ctx=None, args=(), incomplete=""): # pylint: disable=W0613 head, tail = os.path.split(os.path.expanduser(incomplete)) return sorted( (e.path if head else e.path[2:]) + ("/" if e.is_dir() else "") for e in os.scandir(head or ".") if e.name.startswith(tail) ) for command in cli.commands.values(): for param in command.params: if isinstance(param.type, click.Path): param.autocompletion = autocomplete_path try: cli(prog_name=NAME) except APKSigCopierError as e: click.echo("Error: {}.".format(e), err=True) sys.exit(1) if __name__ == "__main__": main() # vim: set tw=80 sw=4 sts=4 et fdm=marker : apksigcopier-1.0.1/apksigcopier.1.md000066400000000000000000000051721407152716400173460ustar00rootroot00000000000000% apksigcopier(1) v1.0.1 | General Commands Manual % Felix C. Stegerman % 2021-07-08 # NAME apksigcopier - copy/extract/patch android apk signatures & compare apks # SYNOPSIS **apksigcopier** copy \[*options*\] *signed_apk* *unsigned_apk* *output_apk* **apksigcopier** extract \[*options*\] *signed_apk* *output_dir* **apksigcopier** patch \[*options*\] *metadata_dir* *unsigned_apk* *output_apk* **apksigcopier** compare \[*options*\] *first_apk* *second_apk* **apksigcopier** \--version **apksigcopier** \--help **apksigcopier** \[*command*\] \--help # DESCRIPTION A command line tool for copying android APK signatures from a signed APK to an unsigned one (in order to verify reproducible builds). It can also be used to compare two APKs with different signatures. # COMMANDS ## copy Copy (extract & patch) signatures from signed to unsigned APK. ## extract Extract APK signatures from signed APK. ## patch Patch extracted APK signatures onto unsigned APK. ## compare Compare two APKs by copying the signature from the first to a copy of the second and checking if the resulting APK verifies. This command requires apksigner. # OPTIONS ## copy/extract/patch \--v1-only [no|auto|yes] Whether to expect only a v1 signature: *no* means a v2 signature is expected as well, *auto* means the presence of a v2 signature is detected automatically, and *yes* means a v2 signature is not expected (and ignored if it does exist). Default: *no*. You can also set the environment variable **APKSIGCOPIER_V1_ONLY** instead. ## compare \--unsigned Accept unsigned *second_apk*. # ENVIRONMENT VARIABLES The following environment variables can be set to *1*, *yes*, or *true* to override the default behaviour. ## APKSIGCOPIER_EXCLUDE_ALL_META Exclude all metadata files, not just MANIFEST.MF. ## APKSIGCOPIER_COPY_EXTRA_BYTES Copy extra bytes after data (e.g. an existing v2 signature). # EXAMPLES ## extract ```bash $ mkdir meta $ apksigcopier extract signed.apk meta $ ls -1 meta 8BEA2A77.RSA 8BEA2A77.SF APKSigningBlock APKSigningBlockOffset MANIFEST.MF ``` ## patch ```bash $ apksigcopier patch meta unsigned.apk out.apk ``` ## copy ```bash $ apksigcopier copy signed.apk unsigned.apk out.apk ``` # compare ```bash $ apksigcopier compare foo-from-fdroid.apk foo-built-locally.apk $ apksigcopier compare foo.apk --unsigned foo-unsigned.apk ``` # SEE ALSO apksigner(1) # COPYRIGHT Copyright © 2021 Felix C. Stegerman. License GPLv3+: GNU GPL version 3 or later . This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. apksigcopier-1.0.1/apksigcopier.py000077700000000000000000000000001407152716400216302apksigcopierustar00rootroot00000000000000apksigcopier-1.0.1/setup.py000066400000000000000000000037411407152716400157170ustar00rootroot00000000000000from pathlib import Path import setuptools from apksigcopier import __version__ info = Path(__file__).with_name("README.md").read_text(encoding = "utf8") setuptools.setup( name = "apksigcopier", url = "https://github.com/obfusk/apksigcopier", description = "copy/extract/patch android apk signatures & compare apks", long_description = info, long_description_content_type = "text/markdown", version = __version__, author = "Felix C. Stegerman", author_email = "flx@obfusk.net", license = "GPLv3+", classifiers = [ "Development Status :: 5 - Production/Stable", "Environment :: Console", "Intended Audience :: Developers", "Intended Audience :: Information Technology", "Intended Audience :: System Administrators", "Intended Audience :: Telecommunications Industry", "License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)", "Operating System :: MacOS :: MacOS X", "Operating System :: POSIX :: Linux", "Operating System :: POSIX", "Operating System :: Unix", "Programming Language :: Python :: 3", "Programming Language :: Python :: 3.5", "Programming Language :: Python :: 3.6", "Programming Language :: Python :: 3.7", "Programming Language :: Python :: 3.8", "Programming Language :: Python :: 3.9", # "Programming Language :: Python :: 3.10", "Programming Language :: Python :: Implementation :: CPython", "Programming Language :: Python :: Implementation :: PyPy", "Topic :: Software Development", "Topic :: Utilities", ], keywords = "android apk reproducible signing compare", py_modules = ["apksigcopier"], entry_points = dict(console_scripts = ["apksigcopier = apksigcopier:main"]), python_requires = ">=3.5", install_requires = ["click>=6.0"], )