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ssh-audit/test/test_ssh2.py

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#!/usr/bin/env python
# -*- coding: utf-8 -*-
import os
import struct
import pytest
# pylint: disable=line-too-long,attribute-defined-outside-init
class TestSSH2(object):
@pytest.fixture(autouse=True)
def init(self, ssh_audit):
self.ssh = ssh_audit.SSH
self.ssh2 = ssh_audit.SSH2
self.rbuf = ssh_audit.ReadBuf
self.wbuf = ssh_audit.WriteBuf
self.audit = ssh_audit.audit
self.AuditConf = ssh_audit.AuditConf
def _conf(self):
conf = self.AuditConf('localhost', 22)
conf.colors = False
conf.batch = True
conf.verbose = True
conf.ssh1 = False
conf.ssh2 = True
return conf
@classmethod
def _create_ssh2_packet(cls, payload):
padding = -(len(payload) + 5) % 8
if padding < 4:
padding += 8
plen = len(payload) + padding + 1
pad_bytes = b'\x00' * padding
data = struct.pack('>Ib', plen, padding) + payload + pad_bytes
return data
def _kex_payload(self):
w = self.wbuf()
w.write(b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff')
w.write_list([u'bogus_kex1', u'bogus_kex2']) # We use a bogus kex, otherwise the host key tests will kick off and fail.
w.write_list([u'ssh-rsa', u'rsa-sha2-512', u'rsa-sha2-256', u'ssh-ed25519'])
w.write_list([u'chacha20-poly1305@openssh.com', u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'aes128-gcm@openssh.com', u'aes256-gcm@openssh.com', u'aes128-cbc', u'aes192-cbc', u'aes256-cbc'])
w.write_list([u'chacha20-poly1305@openssh.com', u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'aes128-gcm@openssh.com', u'aes256-gcm@openssh.com', u'aes128-cbc', u'aes192-cbc', u'aes256-cbc'])
w.write_list([u'umac-64-etm@openssh.com', u'umac-128-etm@openssh.com', u'hmac-sha2-256-etm@openssh.com', u'hmac-sha2-512-etm@openssh.com', u'hmac-sha1-etm@openssh.com', u'umac-64@openssh.com', u'umac-128@openssh.com', u'hmac-sha2-256', u'hmac-sha2-512', u'hmac-sha1'])
w.write_list([u'umac-64-etm@openssh.com', u'umac-128-etm@openssh.com', u'hmac-sha2-256-etm@openssh.com', u'hmac-sha2-512-etm@openssh.com', u'hmac-sha1-etm@openssh.com', u'umac-64@openssh.com', u'umac-128@openssh.com', u'hmac-sha2-256', u'hmac-sha2-512', u'hmac-sha1'])
w.write_list([u'none', u'zlib@openssh.com'])
w.write_list([u'none', u'zlib@openssh.com'])
w.write_list([u''])
w.write_list([u''])
w.write_byte(False)
w.write_int(0)
return w.write_flush()
def test_kex_read(self):
kex = self.ssh2.Kex.parse(self._kex_payload())
assert kex is not None
assert kex.cookie == b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
assert kex.kex_algorithms == [u'bogus_kex1', u'bogus_kex2']
assert kex.key_algorithms == [u'ssh-rsa', u'rsa-sha2-512', u'rsa-sha2-256', u'ssh-ed25519']
assert kex.client is not None
assert kex.server is not None
assert kex.client.encryption == [u'chacha20-poly1305@openssh.com', u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'aes128-gcm@openssh.com', u'aes256-gcm@openssh.com', u'aes128-cbc', u'aes192-cbc', u'aes256-cbc']
assert kex.server.encryption == [u'chacha20-poly1305@openssh.com', u'aes128-ctr', u'aes192-ctr', u'aes256-ctr', u'aes128-gcm@openssh.com', u'aes256-gcm@openssh.com', u'aes128-cbc', u'aes192-cbc', u'aes256-cbc']
assert kex.client.mac == [u'umac-64-etm@openssh.com', u'umac-128-etm@openssh.com', u'hmac-sha2-256-etm@openssh.com', u'hmac-sha2-512-etm@openssh.com', u'hmac-sha1-etm@openssh.com', u'umac-64@openssh.com', u'umac-128@openssh.com', u'hmac-sha2-256', u'hmac-sha2-512', u'hmac-sha1']
assert kex.server.mac == [u'umac-64-etm@openssh.com', u'umac-128-etm@openssh.com', u'hmac-sha2-256-etm@openssh.com', u'hmac-sha2-512-etm@openssh.com', u'hmac-sha1-etm@openssh.com', u'umac-64@openssh.com', u'umac-128@openssh.com', u'hmac-sha2-256', u'hmac-sha2-512', u'hmac-sha1']
assert kex.client.compression == [u'none', u'zlib@openssh.com']
assert kex.server.compression == [u'none', u'zlib@openssh.com']
assert kex.client.languages == [u'']
assert kex.server.languages == [u'']
assert kex.follows is False
assert kex.unused == 0
def _get_empty_kex(self, cookie=None):
kex_algs, key_algs = [], []
enc, mac, compression, languages = [], [], ['none'], []
cli = self.ssh2.KexParty(enc, mac, compression, languages)
enc, mac, compression, languages = [], [], ['none'], []
srv = self.ssh2.KexParty(enc, mac, compression, languages)
if cookie is None:
cookie = os.urandom(16)
kex = self.ssh2.Kex(cookie, kex_algs, key_algs, cli, srv, 0)
return kex
def _get_kex_variat1(self):
cookie = b'\x00\x11\x22\x33\x44\x55\x66\x77\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
kex = self._get_empty_kex(cookie)
kex.kex_algorithms.append('bogus_kex1')
kex.kex_algorithms.append('bogus_kex2')
kex.key_algorithms.append('ssh-rsa')
kex.key_algorithms.append('rsa-sha2-512')
kex.key_algorithms.append('rsa-sha2-256')
kex.key_algorithms.append('ssh-ed25519')
kex.server.encryption.append('chacha20-poly1305@openssh.com')
kex.server.encryption.append('aes128-ctr')
kex.server.encryption.append('aes192-ctr')
kex.server.encryption.append('aes256-ctr')
kex.server.encryption.append('aes128-gcm@openssh.com')
kex.server.encryption.append('aes256-gcm@openssh.com')
kex.server.encryption.append('aes128-cbc')
kex.server.encryption.append('aes192-cbc')
kex.server.encryption.append('aes256-cbc')
kex.server.mac.append('umac-64-etm@openssh.com')
kex.server.mac.append('umac-128-etm@openssh.com')
kex.server.mac.append('hmac-sha2-256-etm@openssh.com')
kex.server.mac.append('hmac-sha2-512-etm@openssh.com')
kex.server.mac.append('hmac-sha1-etm@openssh.com')
kex.server.mac.append('umac-64@openssh.com')
kex.server.mac.append('umac-128@openssh.com')
kex.server.mac.append('hmac-sha2-256')
kex.server.mac.append('hmac-sha2-512')
kex.server.mac.append('hmac-sha1')
kex.server.compression.append('zlib@openssh.com')
for a in kex.server.encryption:
kex.client.encryption.append(a)
for a in kex.server.mac:
kex.client.mac.append(a)
for a in kex.server.compression:
if a == 'none':
continue
kex.client.compression.append(a)
return kex
def test_key_payload(self):
kex1 = self._get_kex_variat1()
kex2 = self.ssh2.Kex.parse(self._kex_payload())
assert kex1.payload == kex2.payload
def test_ssh2_server_simple(self, output_spy, virtual_socket):
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.ssh.Protocol.MSG_KEXINIT)
w.write(self._kex_payload())
vsocket.rdata.append(b'SSH-2.0-OpenSSH_7.3 ssh-audit-test\r\n')
vsocket.rdata.append(self._create_ssh2_packet(w.write_flush()))
output_spy.begin()
self.audit(self._conf())
lines = output_spy.flush()
assert len(lines) == 67
def test_ssh2_server_invalid_first_packet(self, output_spy, virtual_socket):
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.ssh.Protocol.MSG_KEXINIT + 1)
vsocket.rdata.append(b'SSH-2.0-OpenSSH_7.3 ssh-audit-test\r\n')
vsocket.rdata.append(self._create_ssh2_packet(w.write_flush()))
output_spy.begin()
with pytest.raises(SystemExit):
self.audit(self._conf())
lines = output_spy.flush()
assert len(lines) == 3
assert 'unknown message' in lines[-1]
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