def androguard_certinfo(app_dir, app_file):
"""Return certificate information."""
certlist = []
apk_file = os.path.join(app_dir, app_file)
hashfunctions = dict(
md5=hashlib.md5,
sha1=hashlib.sha1,
sha256=hashlib.sha256,
sha512=hashlib.sha512,
)
a = APK(apk_file)
certlist.append("v1: {}".format(a.is_signed_v1()))
certlist.append("v2: {}".format(a.is_signed_v2()))
certlist.append("v3: {}".format(a.is_signed_v3()))
certs = set(a.get_certificates_der_v3() + a.get_certificates_der_v2() +
[a.get_certificate_der(x) for x in a.get_signature_names()])
pkeys = set(a.get_public_keys_der_v3() + a.get_public_keys_der_v2())
for cert in certs:
x509_cert = x509.Certificate.load(cert)
certlist.append("Subject: {}".format(
get_certificate_name_string(x509_cert.subject, short=True)))
certlist.append("Signature Algorithm: {}".format(
x509_cert.signature_algo))
certlist.append("Valid From: {}".format(
x509_cert['tbs_certificate']['validity']['not_before'].native))
certlist.append("Valid To: {}".format(
x509_cert['tbs_certificate']['validity']['not_after'].native))
certlist.append("Issuer: {}".format(
get_certificate_name_string(x509_cert.issuer, short=True)))
certlist.append("Serial Number: {}".format(hex(
x509_cert.serial_number)))
certlist.append("Hash Algorithm: {}".format(x509_cert.hash_algo))
for k, v in hashfunctions.items():
certlist.append("{} {}".format(k, v(cert).hexdigest()))
for public_key in pkeys:
x509_public_key = keys.PublicKeyInfo.load(public_key)
certlist.append("PublicKey Algorithm: {}".format(
x509_public_key.algorithm))
certlist.append("Bit Size: {}".format(x509_public_key.bit_size))
certlist.append("Fingerprint: {}".format(
binascii.hexlify(x509_public_key.fingerprint).decode("utf-8")))
try:
certlist.append("Hash Algorithm: {}".format(
x509_public_key.hash_algo))
except ValueError as ve:
# RSA pkey does not have an hash algorithm
pass
return '\n'.join(certlist)
def extract_attributes(sha256):
with NamedTemporaryFile() as f:
f.write(default_storage.open(sha256).read())
f.seek(0)
sign = ApplicationSignature.compute_from_apk(f.name)
package = sign.handle
sign = sign.to_dict()
a = APK(f.name)
sign['uploaded_at'] = datetime.now()
sign['sha256'] = sha256
sign['activities'] = a.get_activities()
sign['features'] = a.get_features()
sign['libraries'] = a.get_libraries()
sign['main_activity'] = a.get_activities()
sign['min_sdk_version'] = a.get_min_sdk_version()
sign['max_sdk_version'] = a.get_max_sdk_version()
sign['target_sdk_version'] = a.get_target_sdk_version()
sign['permissions'] = a.get_permissions()
sign['aosp_permissions'] = a.get_requested_aosp_permissions()
sign[
'third_party_permissions'] = a.get_requested_third_party_permissions(
)
sign['providers'] = a.get_providers()
sign['receivers'] = a.get_receivers()
sign['services'] = a.get_services()
sign['is_valid'] = a.is_valid_APK()
sign['is_signed'] = a.is_signed()
sign['is_signed_v1'] = a.is_signed_v1()
sign['is_signed_v2'] = a.is_signed_v2()
sign['is_signed_v3'] = a.is_signed_v3()
if not es.exists(settings.ELASTICSEARCH_APK_INDEX, id=sha256):
es.index(index=settings.ELASTICSEARCH_APK_INDEX,
id=sha256,
body=sign)
else:
es.update(index=settings.ELASTICSEARCH_APK_INDEX,
id=sha256,
body={'doc': sign},
retry_on_conflict=5)
del a, sign, f
gc.collect()
return package
def is_apk_vulnerable(apk):
with suppress_output(suppress_stdout=True,suppress_stderr=True): a = APK(app)
global sdk, android
if a.is_signed():
print("\033[92m[+]\033[0m APK is signed")
if a.is_signed_v1:
if a.is_signed_v2() or a.is_signed_v3():
sdk, android = "24", "7.0.0"
if a.get_min_sdk_version() < sdk:
print("\033[92m[+]\033[0m APK("+a.get_min_sdk_version()+") is set to run on devices less then API level "+sdk+"(Android "+android+")\n\033[92m[+]\033[0m APK is vulnerable\n\033[93m[!]\033[0m Please connect the device running Android less then "+android+" through adb")
device_connected = input("\033[93m[!]\033[0m Once recommended device is connected. Press 'y': ")
if device_connected != "y":
print("\033[91m[-]\033[0m Recommended device is Not Connected.\n\n\033[91mStopping the exploit.\033[0m")
quit()
else:
print("\033[91m[-]\033[0m APK is Not Vulnerable\n\n\033[91mStopping the exploit.\033[0m")
quit()
else:
print("\033[91m[-]\033[0m APK is Not signed\n\n\033[91mStopping the exploit.\033[0m")
quit()
def testApksignAPKs(self):
# These APKs are from the apksign testcases and cover
# all different signature algorithms as well as some error cases
from androguard.core.bytecodes.apk import APK
import zipfile
from asn1crypto import x509, pem
import binascii
root = "examples/signing/apksig"
# Correct values generated with openssl:
# In the apksig repo:src/test/resources/com/android/apksig
# for f in *.pem; do openssl x509 -in $f -noout -sha256 -fingerprint; done
certfp = {
'dsa-1024.x509.pem': 'fee7c19ff9bfb4197b3727b9fd92d95406b1bd96db99ea642f5faac019a389d7',
'dsa-2048.x509.pem': '97cce0bab292c2d5afb9de90e1810b41a5d25c006a10d10982896aa12ab35a9e',
'dsa-3072.x509.pem': '966a4537058d24098ea213f12d4b24e37ff5a1d8f68deb8a753374881f23e474',
'ec-p256.x509.pem': '6a8b96e278e58f62cfe3584022cec1d0527fcb85a9e5d2e1694eb0405be5b599',
'ec-p384.x509.pem': '5e7777ada7ee7ce8f9c4d1b07094876e5604617b7988b4c5d5b764a23431afbe',
'ec-p521.x509.pem': '69b50381d98bebcd27df6d7df8af8c8b38d0e51e9168a95ab992d1a9da6082da',
'rsa-1024_2.x509.pem': 'eba3685e799f59804684abebf0363e14ccb1c213e2b954a22669714ed97f61e9',
'rsa-1024.x509.pem': 'bc5e64eab1c4b5137c0fbc5ed05850b3a148d1c41775cffa4d96eea90bdd0eb8',
'rsa-16384.x509.pem': 'f3c6b37909f6df310652fbd7c55ec27d3079dcf695dc6e75e22ba7c4e1c95601',
'rsa-2048_2.x509.pem': '681b0e56a796350c08647352a4db800cc44b2adc8f4c72fa350bd05d4d50264d',
'rsa-2048_3.x509.pem': 'bb77a72efc60e66501ab75953af735874f82cfe52a70d035186a01b3482180f3',
'rsa-2048.x509.pem': 'fb5dbd3c669af9fc236c6991e6387b7f11ff0590997f22d0f5c74ff40e04fca8',
'rsa-3072.x509.pem': '483934461229a780010bc07cd6eeb0b67025fc4fe255757abbf5c3f2ed249e89',
'rsa-4096.x509.pem': '6a46158f87753395a807edcc7640ac99c9125f6b6e025bdbf461ff281e64e685',
'rsa-8192.x509.pem': '060d0a24fea9b60d857225873f78838e081795f7ef2d1ea401262bbd75a58234',
}
will_not_validate_correctly = [
"targetSandboxVersion-2.apk",
"targetSandboxVersion-2.apk",
"v1-only-with-cr-in-entry-name.apk",
"v1-only-with-lf-in-entry-name.apk",
"v1-only-with-nul-in-entry-name.apk",
"v1-only-with-rsa-1024-cert-not-der2.apk",
"v2-only-cert-and-public-key-mismatch.apk",
"v2-only-with-dsa-sha256-1024-sig-does-not-verify.apk",
"debuggable-boolean.apk",
"debuggable-resource.apk",
]
# Collect possible hashes for certificates
# Unfortunately, not all certificates are supplied...
for apath in os.listdir(root):
if apath in certfp:
with open(os.path.join(root, apath), "rb") as fp:
cert = x509.Certificate.load(pem.unarmor(fp.read())[2])
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertEqual(h, certfp[apath])
self.assertIn(h, certfp.values())
for apath in os.listdir(root):
if apath.endswith(".apk"):
if apath == "v2-only-garbage-between-cd-and-eocd.apk" or \
apath == "v2-only-truncated-cd.apk" or \
apath == "v1v2v3-with-rsa-2048-lineage-3-signers-invalid-zip.apk":
# Can not load as APK
with self.assertRaises(zipfile.BadZipFile):
APK(os.path.join(root, apath))
continue
elif apath in will_not_validate_correctly:
# These APKs are faulty (by design) and will return a not correct fingerprint.
# TODO: we need to check if we can prevent such errors...
continue
a = APK(os.path.join(root, apath))
self.assertIsInstance(a, APK)
# Test if the correct method returns True, while others return
# False
m_tests = {'1': a.is_signed_v1,
'2': a.is_signed_v2,
'3': a.is_signed_v3}
# These APKs will raise an error
excluded = [
"v1v2v3-with-rsa-2048-lineage-3-signers-no-sig-block.apk",
"v2-only-apk-sig-block-size-mismatch.apk",
"v2-only-empty.apk",
"v2-only-wrong-apk-sig-block-magic.apk",
"v2-stripped.apk",
"v2-stripped-with-ignorable-signing-schemes.apk",
"v2v3-signed-v3-block-stripped.apk",
"v3-only-empty.apk",
"v3-only-with-ecdsa-sha512-p384-wrong-apk-sig-block-magic.apk",
"v3-only-with-rsa-pkcs1-sha512-4096-apk-sig-block-size-mismatch.apk",
"v3-stripped.apk",
]
if apath[0] == "v" and apath not in excluded:
methods = apath.split("-", 1)[0].split("v")[1:]
for m, f in m_tests.items():
if m in methods:
self.assertTrue(f())
else:
self.assertFalse(f())
# Special error cases
if apath == "v2-only-apk-sig-block-size-mismatch.apk":
with self.assertRaises(apk.BrokenAPKError):
a.is_signed_v2()
continue
elif apath == "v2-only-empty.apk":
with self.assertRaises(apk.BrokenAPKError):
a.is_signed_v2()
continue
elif apath == "v3-only-with-rsa-pkcs1-sha512-4096-apk-sig-block-size-mismatch.apk":
with self.assertRaises(apk.BrokenAPKError):
a.is_signed_v3()
continue
if a.is_signed_v1():
if apath == "weird-compression-method.apk":
with self.assertRaises(NotImplementedError):
for c in a.get_signature_names():
a.get_certificate(c)
elif apath == "v1-only-with-rsa-1024-cert-not-der.apk":
for sig in a.get_signature_names():
c = a.get_certificate(sig)
h = c.sha256_fingerprint.replace(" ","").lower()
self.assertNotIn(h, certfp.values())
# print([apath, h]) # I do not know, why put this file?
der = a.get_certificate_der(sig)
apk.show_Certificate(c, True)
apk.show_Certificate(c, False)
self.assertEqual(hashlib.sha256(der).hexdigest(), h)
pass
else:
for sig in a.get_signature_names():
c = a.get_certificate(sig)
h = c.sha256_fingerprint.replace(" ","").lower()
self.assertIn(h, certfp.values())
# Check that we get the same signature if we take the DER
der = a.get_certificate_der(sig)
self.assertEqual(hashlib.sha256(der).hexdigest(), h)
if a.is_signed_v2():
if apath == "weird-compression-method.apk":
with self.assertRaises(NotImplementedError):
a.get_certificates_der_v2()
elif apath == "v2-only-with-rsa-pkcs1-sha256-1024-cert-not-der.apk":
# FIXME
# Not sure what this one should do... but the certificate fingerprint is weird
# as the hash over the DER is not the same when using the certificate
continue
else:
for c in a.get_certificates_der_v2():
cert = x509.Certificate.load(c)
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertIn(h, certfp.values())
# Check that we get the same signature if we take the DER
self.assertEqual(hashlib.sha256(c).hexdigest(), h)
if a.is_signed_v3():
print(apath)
if apath == "weird-compression-method.apk":
with self.assertRaises(NotImplementedError):
a.get_certificates_der_v3()
elif apath == "v3-only-with-rsa-pkcs1-sha256-3072-sig-does-not-verify.apk" or \
apath == "v3-only-cert-and-public-key-mismatch.apk":
cert = x509.Certificate.load(a.get_certificates_der_v3()[0])
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertNotIn(h, certfp.values())
else:
for c in a.get_certificates_der_v3():
cert = x509.Certificate.load(c)
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertIn(h, certfp.values())
# Check that we get the same signature if we take the DER
self.assertEqual(hashlib.sha256(c).hexdigest(), h)
def cert_info(app_dir, app_file):
"""Return certificate information."""
try:
logger.info('Reading Code Signing Certificate')
manifestfile = None
manidat = ''
cert_info = ''
certlist = []
cert_path = os.path.join(app_dir, 'META-INF/')
apk_file = os.path.join(app_dir, app_file)
hashfunctions = {
'md5': hashlib.md5,
'sha1': hashlib.sha1,
'sha256': hashlib.sha256,
'sha512': hashlib.sha512,
}
files = [
f for f in os.listdir(cert_path)
if os.path.isfile(os.path.join(cert_path, f))
]
a = APK(apk_file)
if a.is_signed():
certlist.append('APK is signed')
else:
certlist.append('Missing certificate')
certlist.append('v1 signature: {}'.format(a.is_signed_v1()))
certlist.append('v2 signature: {}'.format(a.is_signed_v2()))
certlist.append('v3 signature: {}'.format(a.is_signed_v3()))
certs = set(
a.get_certificates_der_v3() + a.get_certificates_der_v2() +
[a.get_certificate_der(x) for x in a.get_signature_names()])
pkeys = set(a.get_public_keys_der_v3() + a.get_public_keys_der_v2())
if len(certs) > 0:
certlist.append('Found {} unique certificates'.format(len(certs)))
for cert in certs:
x509_cert = x509.Certificate.load(cert)
certlist.append('Subject: {}'.format(
get_certificate_name_string(x509_cert.subject, short=True)))
certlist.append('Signature Algorithm: {}'.format(
x509_cert.signature_algo))
certlist.append('Valid From: {}'.format(
x509_cert['tbs_certificate']['validity']['not_before'].native))
certlist.append('Valid To: {}'.format(
x509_cert['tbs_certificate']['validity']['not_after'].native))
certlist.append('Issuer: {}'.format(
get_certificate_name_string(x509_cert.issuer, short=True)))
certlist.append('Serial Number: {}'.format(
hex(x509_cert.serial_number)))
certlist.append('Hash Algorithm: {}'.format(x509_cert.hash_algo))
for k, v in hashfunctions.items():
certlist.append('{}: {}'.format(k, v(cert).hexdigest()))
for public_key in pkeys:
x509_public_key = asymmetric.load_public_key(public_key)
certlist.append('PublicKey Algorithm: {}'.format(
x509_public_key.algorithm))
certlist.append('Bit Size: {}'.format(x509_public_key.bit_size))
certlist.append('Fingerprint: {}'.format(
binascii.hexlify(x509_public_key.fingerprint).decode('utf-8')))
cert_info = '\n'.join(certlist)
if 'MANIFEST.MF' in files:
manifestfile = os.path.join(cert_path, 'MANIFEST.MF')
if manifestfile:
with open(manifestfile, 'r', encoding='utf-8') as manifile:
manidat = manifile.read()
sha256_digest = bool(re.findall(r'SHA-256-Digest', manidat))
findings = []
if a.is_signed():
findings.append(('good', 'Application is signed with a code '
'signing certificate'))
else:
findings.append(('bad', 'Code signing certificate not found'))
if a.is_signed_v1():
status = 'bad'
if a.is_signed_v2() or a.is_signed_v3():
status = 'warning'
findings.append(
(status, 'Application is signed with v1 signature scheme, '
'making it vulnerable to Janus vulnerability on '
'Android <7.0'))
if re.findall(r'CN=Android Debug', cert_info):
findings.append(
('bad', 'Application signed with a debug certificate. '
'Production application must not be shipped '
'with a debug certificate.'))
if re.findall(r'Hash Algorithm: sha1', cert_info):
status = 'bad'
desc = ('Application is signed with SHA1withRSA. '
'SHA1 hash algorithm is known to have '
'collision issues.')
if sha256_digest:
status = 'warning'
desc += (' The manifest file indicates SHA256withRSA'
' is in use.')
findings.append((status, desc))
cert_dic = {
'certificate_info': cert_info,
'certificate_findings': findings,
}
return cert_dic
except Exception:
logger.exception('Reading Code Signing Certificate')
return {}
def androsign_main(args_apk, args_hash, args_all, show):
from androguard.core.bytecodes.apk import APK
from androguard.util import get_certificate_name_string
import hashlib
import binascii
import traceback
from colorama import Fore, Style
from asn1crypto import x509, keys
from oscrypto import asymmetric
# Keep the list of hash functions in sync with cli/entry_points.py:sign
hashfunctions = dict(md5=hashlib.md5,
sha1=hashlib.sha1,
sha256=hashlib.sha256,
sha512=hashlib.sha512,
)
if args_hash.lower() not in hashfunctions:
print("Hash function {} not supported!"
.format(args_hash.lower()), file=sys.stderr)
print("Use one of {}"
.format(", ".join(hashfunctions.keys())), file=sys.stderr)
sys.exit(1)
for path in args_apk:
try:
a = APK(path)
print("{}, package: '{}'".format(os.path.basename(path), a.get_package()))
print("Is signed v1: {}".format(a.is_signed_v1()))
print("Is signed v2: {}".format(a.is_signed_v2()))
print("Is signed v3: {}".format(a.is_signed_v3()))
certs = set(a.get_certificates_der_v3() + a.get_certificates_der_v2() + [a.get_certificate_der(x) for x in a.get_signature_names()])
pkeys = set(a.get_public_keys_der_v3() + a.get_public_keys_der_v2())
if len(certs) > 0:
print("Found {} unique certificates".format(len(certs)))
for cert in certs:
if show:
x509_cert = x509.Certificate.load(cert)
print("Issuer:", get_certificate_name_string(x509_cert.issuer, short=True))
print("Subject:", get_certificate_name_string(x509_cert.subject, short=True))
print("Serial Number:", hex(x509_cert.serial_number))
print("Hash Algorithm:", x509_cert.hash_algo)
print("Signature Algorithm:", x509_cert.signature_algo)
print("Valid not before:", x509_cert['tbs_certificate']['validity']['not_before'].native)
print("Valid not after:", x509_cert['tbs_certificate']['validity']['not_after'].native)
if not args_all:
print("{} {}".format(args_hash.lower(), hashfunctions[args_hash.lower()](cert).hexdigest()))
else:
for k, v in hashfunctions.items():
print("{} {}".format(k, v(cert).hexdigest()))
print()
if len(certs) > 0:
print("Found {} unique public keys associated with the certs".format(len(pkeys)))
for public_key in pkeys:
if show:
x509_public_key = asymmetric.load_public_key(public_key)
print("PublicKey Algorithm:", x509_public_key.algorithm)
print("Bit Size:", x509_public_key.bit_size)
print("Fingerprint:", binascii.hexlify(x509_public_key.fingerprint))
try:
print("Hash Algorithm:", hash_algo(x509_public_key))
except ValueError as ve:
# RSA pkey does not have an hash algorithm
pass
print()
except:
print(Fore.RED + "Error in {}".format(os.path.basename(path)) + Style.RESET_ALL, file=sys.stderr)
traceback.print_exc(file=sys.stderr)
if len(args_apk) > 1:
print()
def androsign_main(args_apk, args_hash, args_all, show):
from androguard.core.bytecodes.apk import APK
from androguard.util import get_certificate_name_string
import hashlib
import binascii
import traceback
from colorama import Fore, Style
from asn1crypto import x509, keys
# Keep the list of hash functions in sync with cli/entry_points.py:sign
hashfunctions = dict(md5=hashlib.md5,
sha1=hashlib.sha1,
sha256=hashlib.sha256,
sha512=hashlib.sha512,
)
if args_hash.lower() not in hashfunctions:
print("Hash function {} not supported!"
.format(args_hash.lower()), file=sys.stderr)
print("Use one of {}"
.format(", ".join(hashfunctions.keys())), file=sys.stderr)
sys.exit(1)
for path in args_apk:
try:
a = APK(path)
print("{}, package: '{}'".format(os.path.basename(path), a.get_package()))
print("Is signed v1: {}".format(a.is_signed_v1()))
print("Is signed v2: {}".format(a.is_signed_v2()))
print("Is signed v3: {}".format(a.is_signed_v3()))
certs = set(a.get_certificates_der_v3() + a.get_certificates_der_v2() + [a.get_certificate_der(x) for x in a.get_signature_names()])
pkeys = set(a.get_public_keys_der_v3() + a.get_public_keys_der_v2())
if len(certs) > 0:
print("Found {} unique certificates".format(len(certs)))
for cert in certs:
if show:
x509_cert = x509.Certificate.load(cert)
print("Issuer:", get_certificate_name_string(x509_cert.issuer, short=True))
print("Subject:", get_certificate_name_string(x509_cert.subject, short=True))
print("Serial Number:", hex(x509_cert.serial_number))
print("Hash Algorithm:", x509_cert.hash_algo)
print("Signature Algorithm:", x509_cert.signature_algo)
print("Valid not before:", x509_cert['tbs_certificate']['validity']['not_before'].native)
print("Valid not after:", x509_cert['tbs_certificate']['validity']['not_after'].native)
if not args_all:
print("{} {}".format(args_hash.lower(), hashfunctions[args_hash.lower()](cert).hexdigest()))
else:
for k, v in hashfunctions.items():
print("{} {}".format(k, v(cert).hexdigest()))
print()
if len(certs) > 0:
print("Found {} unique public keys associated with the certs".format(len(pkeys)))
for public_key in pkeys:
if show:
x509_public_key = keys.PublicKeyInfo.load(public_key)
print("PublicKey Algorithm:", x509_public_key.algorithm)
print("Bit Size:", x509_public_key.bit_size)
print("Fingerprint:", binascii.hexlify(x509_public_key.fingerprint))
try:
print("Hash Algorithm:", x509_public_key.hash_algo)
except ValueError as ve:
# RSA pkey does not have an hash algorithm
pass
print()
except:
print(Fore.RED + "Error in {}".format(os.path.basename(path)) + Style.RESET_ALL, file=sys.stderr)
traceback.print_exc(file=sys.stderr)
if len(args_apk) > 1:
print()
def cert_info(app_dir, app_file):
"""Return certificate information."""
try:
logger.info('Reading Code Signing Certificate')
issued = ''
manidat = ''
certlist = []
cert_path = os.path.join(app_dir, 'META-INF/')
apk_file = os.path.join(app_dir, app_file)
hashfunctions = {
'md5': hashlib.md5,
'sha1': hashlib.sha1,
'sha256': hashlib.sha256,
'sha512': hashlib.sha512,
}
files = [
f for f in os.listdir(cert_path)
if os.path.isfile(os.path.join(cert_path, f))
]
a = APK(apk_file)
if a.is_signed():
certlist.append('APK is signed')
else:
certlist.append('Missing certificate')
certlist.append('v1 signature: {}'.format(a.is_signed_v1()))
certlist.append('v2 signature: {}'.format(a.is_signed_v2()))
certlist.append('v3 signature: {}'.format(a.is_signed_v3()))
certs = set(
a.get_certificates_der_v3() + a.get_certificates_der_v2() +
[a.get_certificate_der(x) for x in a.get_signature_names()])
pkeys = set(a.get_public_keys_der_v3() + a.get_public_keys_der_v2())
if len(certs) > 0:
certlist.append('Found {} unique certificates'.format(len(certs)))
for cert in certs:
x509_cert = x509.Certificate.load(cert)
certlist.append('Subject: {}'.format(
get_certificate_name_string(x509_cert.subject, short=True)))
certlist.append('Signature Algorithm: {}'.format(
x509_cert.signature_algo))
certlist.append('Valid From: {}'.format(
x509_cert['tbs_certificate']['validity']['not_before'].native))
certlist.append('Valid To: {}'.format(
x509_cert['tbs_certificate']['validity']['not_after'].native))
certlist.append('Issuer: {}'.format(
get_certificate_name_string(x509_cert.issuer, short=True)))
certlist.append('Serial Number: {}'.format(
hex(x509_cert.serial_number)))
certlist.append('Hash Algorithm: {}'.format(x509_cert.hash_algo))
for k, v in hashfunctions.items():
certlist.append('{}: {}'.format(k, v(cert).hexdigest()))
for public_key in pkeys:
x509_public_key = keys.PublicKeyInfo.load(public_key)
certlist.append('PublicKey Algorithm: {}'.format(
x509_public_key.algorithm))
certlist.append('Bit Size: {}'.format(x509_public_key.bit_size))
certlist.append('Fingerprint: {}'.format(
binascii.hexlify(x509_public_key.fingerprint).decode('utf-8')))
try:
certlist.append('Hash Algorithm: {}'.format(
x509_public_key.hash_algo))
except ValueError:
pass
certlist = '\n'.join(certlist)
if a.is_signed():
issued = 'good'
else:
issued = 'missing'
if re.findall(r'CN=Android Debug', certlist):
issued = 'bad'
if re.findall(r'Hash Algorithm: sha1', certlist):
issued = 'bad hash'
if 'MANIFEST.MF' in files:
manifestfile = os.path.join(cert_path, 'MANIFEST.MF')
if manifestfile:
with open(manifestfile, 'r', encoding='utf-8') as manifile:
manidat = manifile.read()
sha256_digest = bool(re.findall(r'SHA-256-Digest', manidat))
cert_dic = {
'cert_info': certlist,
'issued': issued,
'sha256Digest': sha256_digest,
}
return cert_dic
except Exception:
logger.exception('Reading Code Signing Certificate')
def testApksignAPKs(self):
# These APKs are from the apksign testcases and cover
# all different signature algorithms as well as some error cases
from androguard.core.bytecodes.apk import APK
import zipfile
from asn1crypto import x509, pem
import binascii
root = "examples/signing/apksig"
# Correct values generated with openssl:
# In the apksig repo:src/test/resources/com/android/apksig
# for f in *.pem; do openssl x509 -in $f -noout -sha256 -fingerprint; done
certfp = {
'dsa-1024.x509.pem': 'fee7c19ff9bfb4197b3727b9fd92d95406b1bd96db99ea642f5faac019a389d7',
'dsa-2048.x509.pem': '97cce0bab292c2d5afb9de90e1810b41a5d25c006a10d10982896aa12ab35a9e',
'dsa-3072.x509.pem': '966a4537058d24098ea213f12d4b24e37ff5a1d8f68deb8a753374881f23e474',
'ec-p256.x509.pem': '6a8b96e278e58f62cfe3584022cec1d0527fcb85a9e5d2e1694eb0405be5b599',
'ec-p384.x509.pem': '5e7777ada7ee7ce8f9c4d1b07094876e5604617b7988b4c5d5b764a23431afbe',
'ec-p521.x509.pem': '69b50381d98bebcd27df6d7df8af8c8b38d0e51e9168a95ab992d1a9da6082da',
'rsa-1024_2.x509.pem': 'eba3685e799f59804684abebf0363e14ccb1c213e2b954a22669714ed97f61e9',
'rsa-1024.x509.pem': 'bc5e64eab1c4b5137c0fbc5ed05850b3a148d1c41775cffa4d96eea90bdd0eb8',
'rsa-16384.x509.pem': 'f3c6b37909f6df310652fbd7c55ec27d3079dcf695dc6e75e22ba7c4e1c95601',
'rsa-2048_2.x509.pem': '681b0e56a796350c08647352a4db800cc44b2adc8f4c72fa350bd05d4d50264d',
'rsa-2048_3.x509.pem': 'bb77a72efc60e66501ab75953af735874f82cfe52a70d035186a01b3482180f3',
'rsa-2048.x509.pem': 'fb5dbd3c669af9fc236c6991e6387b7f11ff0590997f22d0f5c74ff40e04fca8',
'rsa-3072.x509.pem': '483934461229a780010bc07cd6eeb0b67025fc4fe255757abbf5c3f2ed249e89',
'rsa-4096.x509.pem': '6a46158f87753395a807edcc7640ac99c9125f6b6e025bdbf461ff281e64e685',
'rsa-8192.x509.pem': '060d0a24fea9b60d857225873f78838e081795f7ef2d1ea401262bbd75a58234',
}
will_not_validate_correctly = [
"targetSandboxVersion-2.apk",
"targetSandboxVersion-2.apk",
"v1-only-with-cr-in-entry-name.apk",
"v1-only-with-lf-in-entry-name.apk",
"v1-only-with-nul-in-entry-name.apk",
"v1-only-with-rsa-1024-cert-not-der2.apk",
"v2-only-cert-and-public-key-mismatch.apk",
"v2-only-with-dsa-sha256-1024-sig-does-not-verify.apk",
"debuggable-boolean.apk",
"debuggable-resource.apk",
]
# Collect possible hashes for certificates
# Unfortunately, not all certificates are supplied...
for apath in os.listdir(root):
if apath in certfp:
with open(os.path.join(root, apath), "rb") as fp:
cert = x509.Certificate.load(pem.unarmor(fp.read())[2])
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertEqual(h, certfp[apath])
self.assertIn(h, certfp.values())
for apath in os.listdir(root):
if apath.endswith(".apk"):
if apath == "v2-only-garbage-between-cd-and-eocd.apk" or \
apath == "v2-only-truncated-cd.apk" or \
apath == "v1v2v3-with-rsa-2048-lineage-3-signers-invalid-zip.apk":
# Can not load as APK
with self.assertRaises(zipfile.BadZipFile):
APK(os.path.join(root, apath))
continue
elif apath in will_not_validate_correctly:
# These APKs are faulty (by design) and will return a not correct fingerprint.
# TODO: we need to check if we can prevent such errors...
continue
a = APK(os.path.join(root, apath))
self.assertIsInstance(a, APK)
# Test if the correct method returns True, while others return
# False
m_tests = {'1': a.is_signed_v1,
'2': a.is_signed_v2,
'3': a.is_signed_v3}
# These APKs will raise an error
excluded = [
"v1v2v3-with-rsa-2048-lineage-3-signers-no-sig-block.apk",
"v2-only-apk-sig-block-size-mismatch.apk",
"v2-only-empty.apk",
"v2-only-wrong-apk-sig-block-magic.apk",
"v2-stripped.apk",
"v2-stripped-with-ignorable-signing-schemes.apk",
"v2v3-signed-v3-block-stripped.apk",
"v3-only-empty.apk",
"v3-only-with-ecdsa-sha512-p384-wrong-apk-sig-block-magic.apk",
"v3-only-with-rsa-pkcs1-sha512-4096-apk-sig-block-size-mismatch.apk",
"v3-stripped.apk",
]
if apath[0] == "v" and apath not in excluded:
methods = apath.split("-", 1)[0].split("v")[1:]
for m, f in m_tests.items():
if m in methods:
self.assertTrue(f())
else:
self.assertFalse(f())
# Special error cases
if apath == "v2-only-apk-sig-block-size-mismatch.apk":
with self.assertRaises(apk.BrokenAPKError):
a.is_signed_v2()
continue
elif apath == "v2-only-empty.apk":
with self.assertRaises(apk.BrokenAPKError):
a.is_signed_v2()
continue
elif apath == "v3-only-with-rsa-pkcs1-sha512-4096-apk-sig-block-size-mismatch.apk":
with self.assertRaises(apk.BrokenAPKError):
a.is_signed_v3()
continue
if a.is_signed_v1():
if apath == "weird-compression-method.apk":
with self.assertRaises(NotImplementedError):
for c in a.get_signature_names():
a.get_certificate(c)
elif apath == "v1-only-with-rsa-1024-cert-not-der.apk":
for sig in a.get_signature_names():
c = a.get_certificate(sig)
h = c.sha256_fingerprint.replace(" ","").lower()
self.assertNotIn(h, certfp.values())
# print([apath, h]) # I do not know, why put this file?
der = a.get_certificate_der(sig)
apk.show_Certificate(c, True)
apk.show_Certificate(c, False)
self.assertEqual(hashlib.sha256(der).hexdigest(), h)
pass
else:
for sig in a.get_signature_names():
c = a.get_certificate(sig)
h = c.sha256_fingerprint.replace(" ","").lower()
self.assertIn(h, certfp.values())
# Check that we get the same signature if we take the DER
der = a.get_certificate_der(sig)
self.assertEqual(hashlib.sha256(der).hexdigest(), h)
if a.is_signed_v2():
if apath == "weird-compression-method.apk":
with self.assertRaises(NotImplementedError):
a.get_certificates_der_v2()
elif apath == "v2-only-with-rsa-pkcs1-sha256-1024-cert-not-der.apk":
# FIXME
# Not sure what this one should do... but the certificate fingerprint is weird
# as the hash over the DER is not the same when using the certificate
continue
else:
for c in a.get_certificates_der_v2():
cert = x509.Certificate.load(c)
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertIn(h, certfp.values())
# Check that we get the same signature if we take the DER
self.assertEqual(hashlib.sha256(c).hexdigest(), h)
if a.is_signed_v3():
print(apath)
if apath == "weird-compression-method.apk":
with self.assertRaises(NotImplementedError):
a.get_certificates_der_v3()
elif apath == "v3-only-with-rsa-pkcs1-sha256-3072-sig-does-not-verify.apk" or \
apath == "v3-only-cert-and-public-key-mismatch.apk":
cert = x509.Certificate.load(a.get_certificates_der_v3()[0])
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertNotIn(h, certfp.values())
else:
for c in a.get_certificates_der_v3():
cert = x509.Certificate.load(c)
h = cert.sha256_fingerprint.replace(" ","").lower()
self.assertIn(h, certfp.values())
# Check that we get the same signature if we take the DER
self.assertEqual(hashlib.sha256(c).hexdigest(), h)
