mirror of
https://gitlab.com/fdroid/fdroidserver.git
synced 2024-11-18 20:50:10 +01:00
update: AllowedAPKSigningKeys metadata to enforce APK signers
This field lets you specify which signing certificates should be trusted for APKs in a binary repo.
This commit is contained in:
Hans-Christoph Steiner
parent
074ea8cae3
commit
3b95d3de64
@ -47,6 +47,7 @@ metadata_v0:
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- cd fdroiddata
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- ../tests/dump_internal_metadata_format.py
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- sed -i
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-e '/AllowedAPKSigningKeys:/d'
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-e '/Liberapay:/d'
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-e '/OpenCollective/d'
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metadata/dump_*/*.yaml
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@ -90,6 +90,8 @@ yaml_app_field_order = [
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'\n',
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'Builds',
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'\n',
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'AllowedAPKSigningKeys',
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'\n',
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'MaintainerNotes',
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'\n',
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'ArchivePolicy',
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@ -145,6 +147,7 @@ class App(dict):
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self.RepoType = ''
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self.Repo = ''
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self.Binaries = None
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self.AllowedAPKSigningKeys = []
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self.MaintainerNotes = ''
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self.ArchivePolicy = None
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self.AutoUpdateMode = 'None'
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@ -199,6 +202,7 @@ fieldtypes = {
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'MaintainerNotes': TYPE_MULTILINE,
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'Categories': TYPE_LIST,
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'AntiFeatures': TYPE_LIST,
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'AllowedAPKSigningKeys': TYPE_LIST,
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'Build': TYPE_BUILD,
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}
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@ -433,6 +437,10 @@ valuetypes = {
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r'^http[s]?://',
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["Binaries"]),
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FieldValidator("AllowedAPKSigningKeys",
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r'^[a-fA-F0-9]{64}$',
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["AllowedAPKSigningKeys"]),
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FieldValidator("Archive Policy",
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r'^[0-9]+ versions$',
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["ArchivePolicy"]),
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@ -927,6 +935,14 @@ def write_yaml(mf, app):
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cm.update({field: _builds_to_yaml(app)})
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elif field == 'CurrentVersionCode':
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cm.update({field: _field_to_yaml(TYPE_INT, getattr(app, field))})
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elif field == 'AllowedAPKSigningKeys':
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value = getattr(app, field)
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if value:
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value = [str(i).lower() for i in value]
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if len(value) == 1:
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cm.update({field: _field_to_yaml(TYPE_STRING, value[0])})
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else:
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cm.update({field: _field_to_yaml(TYPE_LIST, value)})
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else:
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cm.update({field: _field_to_yaml(fieldtype(field), getattr(app, field))})
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@ -36,6 +36,8 @@ import yaml
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import copy
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from datetime import datetime
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from argparse import ArgumentParser
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from pathlib import Path
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try:
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from yaml import CSafeLoader as SafeLoader
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except ImportError:
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@ -51,6 +53,7 @@ from . import metadata
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from .exception import BuildException, FDroidException
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from PIL import Image, PngImagePlugin
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if hasattr(Image, 'DecompressionBombWarning'):
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warnings.simplefilter('error', Image.DecompressionBombWarning)
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Image.MAX_IMAGE_PIXELS = 0xffffff # 4096x4096
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@ -688,7 +691,6 @@ def insert_obbs(repodir, apps, apks):
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list of current, valid apps
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apks
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current information on all APKs
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"""
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def obbWarnDelete(f, msg):
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logging.warning(msg + ' ' + f)
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@ -2223,6 +2225,31 @@ def get_apps_with_packages(apps, apks):
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return appsWithPackages
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def get_apks_without_allowed_signatures(app, apk):
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"""Check the APK or package has been signed by one of the allowed signing certificates.
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The fingerprint of the signing certificate is the standard X.509
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SHA-256 fingerprint as a hex string. It can be fetched from an
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APK using:
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apksigner verify --print-certs my.apk | grep SHA-256
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Parameters
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----------
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app
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The app which declares the AllowedSigningKey
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apk
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The APK to check
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"""
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if not app or not apk:
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return
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allowed_signer_keys = app.get('AllowedAPKSigningKeys', [])
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if not allowed_signer_keys:
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return
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if apk['signer'] not in allowed_signer_keys:
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return apk['apkName']
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def prepare_apps(apps, apks, repodir):
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"""Encapsulate all necessary preparation steps before we can build an index out of apps and apks.
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@ -2372,6 +2399,23 @@ def main():
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appid_has_apks = set()
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appid_has_repo_files = set()
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for apk in apks:
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to_remove = get_apks_without_allowed_signatures(apps.get(apk['packageName']), apk)
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if to_remove:
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apks.remove(apk)
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logging.warning(
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_('"{path}" is signed by a key that is not allowed:').format(
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path=to_remove
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)
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+ '\n'
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+ apk['signer']
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)
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if options.delete_unknown:
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for d in repodirs:
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path = Path(d) / to_remove
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if path.exists():
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logging.warning(_('Removing {path}"').format(path=path))
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path.unlink()
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if apk['apkName'].endswith('.apk'):
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appid_has_apks.add(apk['packageName'])
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else:
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@ -1,3 +1,4 @@
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AllowedAPKSigningKeys: []
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AntiFeatures: []
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ArchivePolicy: 4 versions
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AuthorEmail: null
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@ -1,3 +1,4 @@
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AllowedAPKSigningKeys: []
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AntiFeatures: []
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ArchivePolicy: null
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AuthorEmail: null
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@ -1,3 +1,4 @@
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AllowedAPKSigningKeys: []
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AntiFeatures: []
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ArchivePolicy: null
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AuthorEmail: null
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@ -1,3 +1,4 @@
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AllowedAPKSigningKeys: []
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AntiFeatures: []
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ArchivePolicy: 9 versions
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AuthorEmail: null
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@ -62,6 +62,7 @@ DONATION_FIELDS = ('Donate', 'Liberapay', 'OpenCollective')
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class Options:
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allow_disabled_algorithms = False
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clean = False
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nosign = False
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pretty = True
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rename_apks = False
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@ -1026,6 +1027,104 @@ class UpdateTest(unittest.TestCase):
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self.assertIsNone(apk)
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self.assertFalse(cachechanged)
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def test_get_apks_without_allowed_signatures(self):
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"""Test when no AllowedAPKSigningKeys is specified"""
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config = dict()
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fdroidserver.common.fill_config_defaults(config)
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fdroidserver.common.config = config
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fdroidserver.common.options = Options
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app = fdroidserver.metadata.App()
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knownapks = fdroidserver.common.KnownApks()
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apkfile = 'v1.v2.sig_1020.apk'
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(skip, apk, cachechanged) = fdroidserver.update.process_apk(
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{}, apkfile, 'repo', knownapks, False
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)
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r = fdroidserver.update.get_apks_without_allowed_signatures(app, apk)
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self.assertIsNone(r)
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def test_get_apks_without_allowed_signatures_allowed(self):
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"""Test when the APK matches the specified AllowedAPKSigningKeys"""
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config = dict()
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fdroidserver.common.fill_config_defaults(config)
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fdroidserver.common.config = config
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fdroidserver.common.options = Options
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fdroidserver.update.options = fdroidserver.common.options
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app = fdroidserver.metadata.App(
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{
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'AllowedAPKSigningKeys': '32a23624c201b949f085996ba5ed53d40f703aca4989476949cae891022e0ed6'
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}
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)
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knownapks = fdroidserver.common.KnownApks()
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apkfile = 'v1.v2.sig_1020.apk'
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(skip, apk, cachechanged) = fdroidserver.update.process_apk(
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{}, apkfile, 'repo', knownapks, False
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)
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r = fdroidserver.update.get_apks_without_allowed_signatures(app, apk)
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self.assertIsNone(r)
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def test_get_apks_without_allowed_signatures_blocked(self):
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"""Test when the APK does not match any specified AllowedAPKSigningKeys"""
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config = dict()
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fdroidserver.common.fill_config_defaults(config)
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fdroidserver.common.config = config
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fdroidserver.common.options = Options
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fdroidserver.update.options = fdroidserver.common.options
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app = fdroidserver.metadata.App(
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{
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'AllowedAPKSigningKeys': 'fa4edeadfa4edeadfa4edeadfa4edeadfa4edeadfa4edeadfa4edeadfa4edead'
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}
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)
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knownapks = fdroidserver.common.KnownApks()
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apkfile = 'v1.v2.sig_1020.apk'
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(skip, apk, cachechanged) = fdroidserver.update.process_apk(
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{}, apkfile, 'repo', knownapks, False
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)
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r = fdroidserver.update.get_apks_without_allowed_signatures(app, apk)
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self.assertEqual(apkfile, r)
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def test_update_with_AllowedAPKSigningKeys(self):
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"""Test that APKs without allowed signatures get deleted."""
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testdir = tempfile.mkdtemp(
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prefix=inspect.currentframe().f_code.co_name, dir=self.tmpdir
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)
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os.chdir(testdir)
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os.mkdir('repo')
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testapk = os.path.join('repo', 'com.politedroid_6.apk')
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shutil.copy(os.path.join(self.basedir, testapk), testapk)
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os.mkdir('metadata')
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metadatafile = os.path.join('metadata', 'com.politedroid.yml')
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shutil.copy(os.path.join(self.basedir, metadatafile), metadatafile)
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with open(metadatafile, 'a') as fp:
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fp.write(
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'\n\nAllowedAPKSigningKeys: 32a23624c201b949f085996ba5ed53d40f703aca4989476949cae891022e0ed6\n'
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)
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fdroidserver.common.options = Options
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config = fdroidserver.common.read_config(fdroidserver.common.options)
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config['repo_keyalias'] = 'sova'
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config['keystorepass'] = 'r9aquRHYoI8+dYz6jKrLntQ5/NJNASFBacJh7Jv2BlI='
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config['keypass'] = 'r9aquRHYoI8+dYz6jKrLntQ5/NJNASFBacJh7Jv2BlI='
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config['keystore'] = os.path.join(self.basedir, 'keystore.jks')
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self.assertTrue(os.path.exists(testapk))
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with mock.patch('sys.argv', ['fdroid update', '--delete-unknown']):
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fdroidserver.update.main()
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self.assertTrue(os.path.exists(testapk))
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with open(metadatafile, 'a') as fp:
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fp.write(
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'\n\nAllowedAPKSigningKeys: fa4edeadfa4edeadfa4edeadfa4edeadfa4edeadfa4edeadfa4edeadfa4edead\n'
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)
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with mock.patch('sys.argv', ['fdroid update', '--delete-unknown']):
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fdroidserver.update.main()
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self.assertFalse(os.path.exists(testapk))
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def test_translate_per_build_anti_features(self):
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os.chdir(os.path.join(localmodule, 'tests'))
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testdir = tempfile.mkdtemp(
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