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https://github.com/jtesta/ssh-audit.git
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359 lines
12 KiB
Python
359 lines
12 KiB
Python
import hashlib
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import pytest
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from datetime import date
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from ssh_audit.policy import Policy
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from ssh_audit.ssh2_kex import SSH2_Kex
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from ssh_audit.writebuf import WriteBuf
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class TestPolicy:
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@pytest.fixture(autouse=True)
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def init(self, ssh_audit):
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self.Policy = Policy
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self.wbuf = WriteBuf
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self.ssh2_kex = SSH2_Kex
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def _get_kex(self):
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'''Returns an SSH2.Kex object to simulate a server connection.'''
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w = self.wbuf()
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w.write(b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff')
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w.write_list(['kex_alg1', 'kex_alg2'])
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w.write_list(['key_alg1', 'key_alg2'])
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w.write_list(['cipher_alg1', 'cipher_alg2', 'cipher_alg3'])
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w.write_list(['cipher_alg1', 'cipher_alg2', 'cipher_alg3'])
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w.write_list(['mac_alg1', 'mac_alg2', 'mac_alg3'])
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w.write_list(['mac_alg1', 'mac_alg2', 'mac_alg3'])
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w.write_list(['comp_alg1', 'comp_alg2'])
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w.write_list(['comp_alg1', 'comp_alg2'])
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w.write_list([''])
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w.write_list([''])
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w.write_byte(False)
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w.write_int(0)
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return self.ssh2_kex.parse(w.write_flush())
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def test_builtin_policy_consistency(self):
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'''Ensure that the BUILTIN_POLICIES struct is consistent.'''
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for policy_name in Policy.BUILTIN_POLICIES:
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# Ensure that the policy name ends with " (version X)", where X is the 'version' field.
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version_str = " (version %s)" % Policy.BUILTIN_POLICIES[policy_name]['version']
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assert policy_name.endswith(version_str)
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# Ensure that each built-in policy can be loaded with Policy.load_builtin_policy().
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assert Policy.load_builtin_policy(policy_name) is not None
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# Ensure that both server and client policy names are returned.
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server_policy_names, client_policy_names = Policy.list_builtin_policies()
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assert len(server_policy_names) > 0
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assert len(client_policy_names) > 0
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def test_policy_basic(self):
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'''Ensure that a basic policy can be parsed correctly.'''
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policy_data = '''# This is a comment
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name = "Test Policy"
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version = 1
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compressions = comp_alg1
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host keys = key_alg1
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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assert str(policy) == "Name: [Test Policy]\nVersion: [1]\nBanner: {undefined}\nCompressions: comp_alg1\nHost Keys: key_alg1\nOptional Host Keys: {undefined}\nKey Exchanges: kex_alg1, kex_alg2\nCiphers: cipher_alg1, cipher_alg2, cipher_alg3\nMACs: mac_alg1, mac_alg2, mac_alg3\nHost Key Sizes: {undefined}\nCA Key Sizes: {undefined}\nDH Modulus Sizes: {undefined}\nServer Policy: True"
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def test_policy_invalid_1(self):
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'''Basic policy, but with 'ciphersx' instead of 'ciphers'.'''
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policy_data = '''# This is a comment
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name = "Test Policy"
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version = 1
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compressions = comp_alg1
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host keys = key_alg1
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key exchanges = kex_alg1, kex_alg2
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ciphersx = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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failed = False
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try:
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self.Policy(policy_data=policy_data)
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except ValueError:
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failed = True
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assert failed, "Invalid policy did not cause Policy object to throw exception"
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def test_policy_invalid_2(self):
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'''Basic policy, but is missing the required name field.'''
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policy_data = '''# This is a comment
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#name = "Test Policy"
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version = 1
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compressions = comp_alg1
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host keys = key_alg1
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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failed = False
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try:
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self.Policy(policy_data=policy_data)
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except ValueError:
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failed = True
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assert failed, "Invalid policy did not cause Policy object to throw exception"
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def test_policy_invalid_3(self):
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'''Basic policy, but is missing the required version field.'''
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policy_data = '''# This is a comment
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name = "Test Policy"
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#version = 1
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compressions = comp_alg1
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host keys = key_alg1
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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failed = False
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try:
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self.Policy(policy_data=policy_data)
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except ValueError:
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failed = True
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assert failed, "Invalid policy did not cause Policy object to throw exception"
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def test_policy_invalid_4(self):
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'''Basic policy, but is missing quotes in the name field.'''
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policy_data = '''# This is a comment
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name = Test Policy
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version = 1
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compressions = comp_alg1
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host keys = key_alg1
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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failed = False
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try:
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self.Policy(policy_data=policy_data)
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except ValueError:
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failed = True
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assert failed, "Invalid policy did not cause Policy object to throw exception"
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def test_policy_invalid_5(self):
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'''Basic policy, but is missing quotes in the banner field.'''
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policy_data = '''# This is a comment
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name = "Test Policy"
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version = 1
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banner = 0mg
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compressions = comp_alg1
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host keys = key_alg1
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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failed = False
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try:
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self.Policy(policy_data=policy_data)
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except ValueError:
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failed = True
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assert failed, "Invalid policy did not cause Policy object to throw exception"
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def test_policy_invalid_6(self):
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'''Basic policy, but is missing quotes in the header field.'''
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policy_data = '''# This is a comment
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name = "Test Policy"
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version = 1
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header = 0mg
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compressions = comp_alg1
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host keys = key_alg1
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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failed = False
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try:
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self.Policy(policy_data=policy_data)
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except ValueError:
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failed = True
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assert failed, "Invalid policy did not cause Policy object to throw exception"
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def test_policy_create_1(self):
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'''Creates a policy from a kex and ensures it is generated exactly as expected.'''
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kex = self._get_kex()
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pol_data = self.Policy.create('www.l0l.com', 'bannerX', kex, False)
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# Today's date is embedded in the policy, so filter it out to get repeatable results.
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pol_data = pol_data.replace(date.today().strftime('%Y/%m/%d'), '[todays date]')
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# Instead of writing out the entire expected policy--line by line--just check that it has the expected hash.
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assert hashlib.sha256(pol_data.encode('ascii')).hexdigest() == '4af7777fb57a1dad0cf438c899a11d4f625fd9276ea3bb5ef5c9fe8806cb47dc'
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def test_policy_evaluate_passing_1(self):
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'''Creates a policy and evaluates it against the same server'''
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kex = self._get_kex()
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policy_data = self.Policy.create('www.l0l.com', None, kex, False)
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', kex)
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assert ret is True
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assert len(errors) == 0
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print(error_str)
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assert len(error_str) == 0
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def test_policy_evaluate_failing_1(self):
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'''Ensure that a policy with a specified banner fails against a server with a different banner'''
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policy_data = '''name = "Test Policy"
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version = 1
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banner = "XXX mismatched banner XXX"
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compressions = comp_alg1, comp_alg2
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host keys = key_alg1, key_alg2
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', self._get_kex())
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assert ret is False
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assert len(errors) == 1
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assert error_str.find('Banner did not match.') != -1
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def test_policy_evaluate_failing_2(self):
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'''Ensure that a mismatched compressions list results in a failure'''
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policy_data = '''name = "Test Policy"
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version = 1
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compressions = XXXmismatchedXXX, comp_alg1, comp_alg2
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host keys = key_alg1, key_alg2
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', self._get_kex())
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assert ret is False
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assert len(errors) == 1
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assert error_str.find('Compression did not match.') != -1
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def test_policy_evaluate_failing_3(self):
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'''Ensure that a mismatched host keys results in a failure'''
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policy_data = '''name = "Test Policy"
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version = 1
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compressions = comp_alg1, comp_alg2
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host keys = XXXmismatchedXXX, key_alg1, key_alg2
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', self._get_kex())
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assert ret is False
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assert len(errors) == 1
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assert error_str.find('Host keys did not match.') != -1
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def test_policy_evaluate_failing_4(self):
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'''Ensure that a mismatched key exchange list results in a failure'''
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policy_data = '''name = "Test Policy"
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version = 1
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compressions = comp_alg1, comp_alg2
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host keys = key_alg1, key_alg2
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key exchanges = XXXmismatchedXXX, kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', self._get_kex())
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assert ret is False
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assert len(errors) == 1
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assert error_str.find('Key exchanges did not match.') != -1
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def test_policy_evaluate_failing_5(self):
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'''Ensure that a mismatched cipher list results in a failure'''
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policy_data = '''name = "Test Policy"
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version = 1
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compressions = comp_alg1, comp_alg2
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host keys = key_alg1, key_alg2
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, XXXmismatched, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', self._get_kex())
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assert ret is False
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assert len(errors) == 1
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assert error_str.find('Ciphers did not match.') != -1
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def test_policy_evaluate_failing_6(self):
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'''Ensure that a mismatched MAC list results in a failure'''
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policy_data = '''name = "Test Policy"
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version = 1
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compressions = comp_alg1, comp_alg2
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host keys = key_alg1, key_alg2
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, XXXmismatched, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', self._get_kex())
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assert ret is False
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assert len(errors) == 1
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assert error_str.find('MACs did not match.') != -1
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def test_policy_evaluate_failing_7(self):
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'''Ensure that a mismatched host keys and MACs results in a failure'''
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policy_data = '''name = "Test Policy"
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version = 1
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compressions = comp_alg1, comp_alg2
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host keys = key_alg1, key_alg2, XXXmismatchedXXX
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key exchanges = kex_alg1, kex_alg2
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ciphers = cipher_alg1, cipher_alg2, cipher_alg3
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macs = mac_alg1, mac_alg2, XXXmismatchedXXX, mac_alg3'''
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policy = self.Policy(policy_data=policy_data)
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ret, errors, error_str = policy.evaluate('SSH Server 1.0', self._get_kex())
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assert ret is False
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assert len(errors) == 2
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assert error_str.find('Host keys did not match.') != -1
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assert error_str.find('MACs did not match.') != -1
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