mirror of https://github.com/jtesta/ssh-audit.git
536 lines
21 KiB
Python
536 lines
21 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.builtin_policies import BUILTIN_POLICIES
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from ssh_audit.outputbuffer import OutputBuffer
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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.OutputBuffer = OutputBuffer
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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(self.OutputBuffer, 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 BUILTIN_POLICIES:
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# Ensure that all required fields are present.
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required_fields = ['version', 'changelog', 'banner', 'compressions', 'host_keys', 'optional_host_keys', 'kex', 'ciphers', 'macs', 'hostkey_sizes', 'dh_modulus_sizes', 'server_policy']
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for field in required_fields:
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assert field in BUILTIN_POLICIES[policy_name]
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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)" % BUILTIN_POLICIES[policy_name]['version']
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assert policy_name.endswith(version_str)
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# Ensure no extra fields are present.
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assert len(required_fields) == len(BUILTIN_POLICIES[policy_name])
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# Ensure that the changelog field is a string and non-empty.
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assert type(BUILTIN_POLICIES[policy_name]['changelog']) is str
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assert len(BUILTIN_POLICIES[policy_name]['changelog']) > 0
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# Ensure that at least one host key is defined.
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assert type(BUILTIN_POLICIES[policy_name]['host_keys']) is list
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assert len(BUILTIN_POLICIES[policy_name]['host_keys']) > 0
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# Ensure that at least one key exchange is defined.
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assert type(BUILTIN_POLICIES[policy_name]['kex']) is list
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assert len(BUILTIN_POLICIES[policy_name]['kex']) > 0
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# Ensure that at least one cipher is defined.
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assert type(BUILTIN_POLICIES[policy_name]['ciphers']) is list
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assert len(BUILTIN_POLICIES[policy_name]['ciphers']) > 0
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# Ensure that at least one MAC is defined
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assert type(BUILTIN_POLICIES[policy_name]['macs']) is list
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assert len(BUILTIN_POLICIES[policy_name]['macs']) > 0
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# These tests apply to server policies only.
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if BUILTIN_POLICIES[policy_name]['server_policy']:
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assert type(BUILTIN_POLICIES[policy_name]['hostkey_sizes']) is dict
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assert len(BUILTIN_POLICIES[policy_name]['hostkey_sizes']) > 0
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# Examine all the hostkey_sizes entries...
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for hostkey_type in BUILTIN_POLICIES[policy_name]['hostkey_sizes']:
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hostkey_data = BUILTIN_POLICIES[policy_name]['hostkey_sizes'][hostkey_type]
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# Ensure that 'hostkey_size' is always included and that it is an integer.
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assert 'hostkey_size' in hostkey_data
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assert type(hostkey_data['hostkey_size']) is int
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# If this is an ed25519 host key, ensure its size is fixed at 256. If its an RSA host key, ensure the size is 4096.
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if hostkey_type.find('ed25519') != -1:
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assert int(hostkey_data['hostkey_size']) == 256
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elif hostkey_type.startswith('rsa-'):
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assert int(hostkey_data['hostkey_size']) == 4096
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else: # Catch unexpected host key types.
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assert False
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# Ensure either that 'ca_key_type' and 'ca_key_size' are both present, or neither are. Fail cases when only one of the fields are present.
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assert (('ca_key_type' in hostkey_data) and ('ca_key_size' in hostkey_data)) or (('ca_key_type' not in hostkey_data) and ('ca_key_size' not in hostkey_data))
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# Ensure that the ca_key_type is either ssh-rsa or ssh-ed25519.
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if 'ca_key_type' in hostkey_data:
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assert hostkey_data['ca_key_type'] in ['ssh-rsa', 'ssh-ed25519']
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# Ensure RSA CA key sizes are fixed at 4096. Ensure ED25519 CA keys are 256.
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if 'ca_key_size' in hostkey_data:
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if 'ca_key_type' == 'ssh-rsa':
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assert hostkey_data['ca_key_size'] == 4096
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elif 'ca_key_type' == 'ssh-ed25519':
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assert hostkey_data['ca_key_size'] == 256
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# Ensure that the 'dh_modulus_size' field is a dict.
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assert type(BUILTIN_POLICIES[policy_name]['dh_modulus_sizes']) is dict
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# The 'dh_modulus_size' field should have either one entry, or be empty.
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assert len(BUILTIN_POLICIES[policy_name]['dh_modulus_sizes']) in range(0, 2) # The endpoint in range() is not inclusive
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# If 'diffie-hellman-group-exchange-sha256' is in the kex list, ensure that it exists in the 'dh_modulus_sizes' entry. That entry must be defined for 2048 bits or larger.
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if 'diffie-hellman-group-exchange-sha256' in BUILTIN_POLICIES[policy_name]['kex']:
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assert 'diffie-hellman-group-exchange-sha256' in BUILTIN_POLICIES[policy_name]['dh_modulus_sizes']
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assert int(BUILTIN_POLICIES[policy_name]['dh_modulus_sizes']['diffie-hellman-group-exchange-sha256']) >= 2048
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else: # Client-specific tests.
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# These must be set to None for client policies, since they have no meaning otherwise.
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assert BUILTIN_POLICIES[policy_name]['hostkey_sizes'] is None
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assert BUILTIN_POLICIES[policy_name]['dh_modulus_sizes'] is None
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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(False)
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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]\nAllow Algorithm Subset and/or Reordering: False\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}\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() == 'fb84bce442cff2bce9bf653d6373a8a938e3bfcfbd1e876f51a08c1842df3cff'
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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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def test_policy_evaluate_subset_passing_1(self):
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'''Ensure that exact algorithm matches work even when subset parsing is enabled.'''
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policy_data = '''name = "Test Policy"
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version = 1
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allow_algorithm_subset_and_reordering = true
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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 True
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assert len(errors) == 0
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assert error_str == ""
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def test_policy_evaluate_subset_passing_2(self):
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'''Ensure that subset parsing works.'''
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policy_data = '''name = "Test Policy"
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version = 1
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allow_algorithm_subset_and_reordering = true
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compressions = comp_alg1, comp_alg2
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host keys = key_alg2, key_alg1, key_alg0
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key exchanges = kex_alg3, kex_alg1, kex_alg2
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ciphers = cipher_alg0, cipher_alg3, cipher_alg2, cipher_alg1
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macs = mac_alg2, mac_alg1, mac_alg3, mac_alg0'''
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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 True
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assert len(errors) == 0
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assert error_str == ""
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def test_policy_evaluate_subset_failing_1(self):
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'''Ensure that subset parsing returns a failure.'''
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policy_data = '''name = "Test Policy"
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version = 1
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allow_algorithm_subset_and_reordering = true
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compressions = comp_alg1, comp_alg2
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host keys = key_alg7, key_alg8, key_alg9
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key exchanges = kex_alg7, kex_alg8, kex_alg9
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ciphers = cipher_alg7, cipher_alg8, cipher_alg9, cipher_alg10
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macs = mac_alg7, mac_alg8, mac_alg9, mac_alg10'''
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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) == 4
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assert error_str.find("Ciphers did not match.") != -1
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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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assert error_str.find("Key exchanges did not match.") != -1
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def test_policy_evaluate_subset_failing_2(self):
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'''Ensure that subset parsing returns a failure when policy includes kex-strict-s-v00@openssh.com, but target does not.'''
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policy_data = '''name = "Test Policy"
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version = 1
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allow_algorithm_subset_and_reordering = true
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compressions = comp_alg1, comp_alg2
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host keys = key_alg2, key_alg1, key_alg0
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key exchanges = kex_alg3, kex_alg1, kex_alg2, kex-strict-s-v00@openssh.com
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ciphers = cipher_alg0, cipher_alg3, cipher_alg2, cipher_alg1
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macs = mac_alg2, mac_alg1, mac_alg3, mac_alg0'''
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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_subset_failing_3(self):
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'''Ensure that subset parsing returns a failure when policy includes kex-strict-c-v00@openssh.com, but target does not.'''
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policy_data = '''name = "Test Policy"
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version = 1
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allow_algorithm_subset_and_reordering = true
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compressions = comp_alg1, comp_alg2
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host keys = key_alg2, key_alg1, key_alg0
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key exchanges = kex_alg3, kex_alg1, kex_alg2, kex-strict-c-v00@openssh.com
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ciphers = cipher_alg0, cipher_alg3, cipher_alg2, cipher_alg1
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macs = mac_alg2, mac_alg1, mac_alg3, mac_alg0'''
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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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