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# Copyright (c) 2015-2021 by Ron Frederick <ronf@timeheart.net> and others.
#
# This program and the accompanying materials are made available under
# the terms of the Eclipse Public License v2.0 which accompanies this
# distribution and is available at:
#
# http://www.eclipse.org/legal/epl-2.0/
#
# This program may also be made available under the following secondary
# licenses when the conditions for such availability set forth in the
# Eclipse Public License v2.0 are satisfied:
#
# GNU General Public License, Version 2.0, or any later versions of
# that license
#
# SPDX-License-Identifier: EPL-2.0 OR GPL-2.0-or-later
#
# Contributors:
# Ron Frederick - initial implementation, API, and documentation
"""Unit tests for ASN.1 encoding and decoding"""
import codecs
import unittest
from asyncssh.asn1 import der_encode, der_decode
from asyncssh.asn1 import ASN1EncodeError, ASN1DecodeError
from asyncssh.asn1 import BitString, IA5String, ObjectIdentifier
from asyncssh.asn1 import RawDERObject, TaggedDERObject, PRIVATE
class _TestASN1(unittest.TestCase):
"""Unit tests for ASN.1 module"""
tests = [
(None, '0500'),
(False, '010100'),
(True, '0101ff'),
(0, '020100'),
(127, '02017f'),
(128, '02020080'),
(256, '02020100'),
(-128, '020180'),
(-129, '0202ff7f'),
(-256, '0202ff00'),
(b'', '0400'),
(b'\0', '040100'),
(b'abc', '0403616263'),
(127*b'\0', '047f' + 127*'00'),
(128*b'\0', '048180' + 128*'00'),
('', '0c00'),
('\0', '0c0100'),
('abc', '0c03616263'),
((), '3000'),
((1,), '3003020101'),
((1, 2), '3006020101020102'),
(frozenset(), '3100'),
(frozenset({1}), '3103020101'),
(frozenset({1, 2}), '3106020101020102'),
(frozenset({-128, 127}), '310602017f020180'),
(BitString(b''), '030100'),
(BitString(b'\0', 7), '03020700'),
(BitString(b'\x80', 7), '03020780'),
(BitString(b'\x80', named=True), '03020780'),
(BitString(b'\x81', named=True), '03020081'),
(BitString(b'\x81\x00', named=True), '03020081'),
(BitString(b'\x80', 6), '03020680'),
(BitString(b'\x80'), '03020080'),
(BitString(b'\x80\x00', 7), '0303078000'),
(BitString(''), '030100'),
(BitString('0'), '03020700'),
(BitString('1'), '03020780'),
(BitString('10'), '03020680'),
(BitString('10000000'), '03020080'),
(BitString('10000001'), '03020081'),
(BitString('100000000'), '0303078000'),
(IA5String(b''), '1600'),
(IA5String(b'\0'), '160100'),
(IA5String(b'abc'), '1603616263'),
(ObjectIdentifier('0.0'), '060100'),
(ObjectIdentifier('1.2'), '06012a'),
(ObjectIdentifier('1.2.840'), '06032a8648'),
(ObjectIdentifier('2.5'), '060155'),
(ObjectIdentifier('2.40'), '060178'),
(TaggedDERObject(0, None), 'a0020500'),
(TaggedDERObject(1, None), 'a1020500'),
(TaggedDERObject(32, None), 'bf20020500'),
(TaggedDERObject(128, None), 'bf8100020500'),
(TaggedDERObject(0, None, PRIVATE), 'e0020500'),
(RawDERObject(0, b'', PRIVATE), 'c000')
]
encode_errors = [
(range, [1]), # Unsupported type
(BitString, [b'', 1]), # Bit count with empty value
(BitString, [b'', -1]), # Invalid unused bit count
(BitString, [b'', 8]), # Invalid unused bit count
(BitString, [b'0c0', 7]), # Unused bits not zero
(BitString, ['', 1]), # Unused bits with string
(BitString, [0]), # Invalid type
(ObjectIdentifier, ['']), # Too few components
(ObjectIdentifier, ['1']), # Too few components
(ObjectIdentifier, ['-1.1']), # First component out of range
(ObjectIdentifier, ['3.1']), # First component out of range
(ObjectIdentifier, ['0.-1']), # Second component out of range
(ObjectIdentifier, ['0.40']), # Second component out of range
(ObjectIdentifier, ['1.-1']), # Second component out of range
(ObjectIdentifier, ['1.40']), # Second component out of range
(ObjectIdentifier, ['1.1.-1']), # Later component out of range
(TaggedDERObject, [0, None, 99]), # Invalid ASN.1 class
(RawDERObject, [0, None, 99]), # Invalid ASN.1 class
]
decode_errors = [
'', # Incomplete data
'01', # Incomplete data
'0101', # Incomplete data
'1f00', # Incomplete data
'1f8000', # Incomplete data
'1f0001', # Incomplete data
'1f80', # Incomplete tag
'0180', # Indefinite length
'050001', # Unexpected bytes at end
'2500', # Constructed null
'050100', # Null with content
'2100', # Constructed boolean
'010102', # Boolean value not 0x00/0xff
'2200', # Constructed integer
'2400', # Constructed octet string
'2c00', # Constructed UTF-8 string
'1000', # Non-constructed sequence
'1100', # Non-constructed set
'2300', # Constructed bit string
'03020800', # Invalid unused bit count
'3600', # Constructed IA5 string
'2600', # Constructed object identifier
'0600', # Empty object identifier
'06020080', # Invalid component
'06020081' # Incomplete component
]
def test_asn1(self):
"""Unit test ASN.1 module"""
for value, data in self.tests:
data = codecs.decode(data, 'hex')
with self.subTest(msg='encode', value=value):
self.assertEqual(der_encode(value), data)
with self.subTest(msg='decode', data=data):
decoded_value = der_decode(data)
self.assertEqual(decoded_value, value)
self.assertEqual(hash(decoded_value), hash(value))
self.assertEqual(repr(decoded_value), repr(value))
self.assertEqual(str(decoded_value), str(value))
for cls, args in self.encode_errors:
with self.subTest(msg='encode error', cls=cls.__name__, args=args):
with self.assertRaises(ASN1EncodeError):
der_encode(cls(*args))
for data in self.decode_errors:
with self.subTest(msg='decode error', data=data):
with self.assertRaises(ASN1DecodeError):
der_decode(codecs.decode(data, 'hex'))
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