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https://github.com/jtesta/ssh-audit.git
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Import source.
This commit is contained in:
Andris Raugulis
parent
2ef7e65721
commit
3fccc44bc7
316
ssh-audit.py
Executable file
316
ssh-audit.py
Executable file
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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"""
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The MIT License (MIT)
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Copyright (C) 2015 Andris Raugulis (moo@arthepsy.eu)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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"""
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from __future__ import print_function
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import os, io, sys, socket, struct
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SSH_BANNER = 'SSH-2.0-OpenSSH_7.1'
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SOCK_CONN_TIMEOUT = 3.0
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SOCK_READ_TIMEOUT = 5.0
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def usage():
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p = os.path.basename(sys.argv[0])
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out.head('# {0} v1.0.20151223, moo@arthepsy.eu'.format(p))
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out.info('\nusage: {} [-nv] host[:port]\n'.format(p))
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out.info(' -v verbose')
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out.info(' -n disable colors' + os.linesep)
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sys.exit(1)
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class Output(object):
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colors = True
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full = False
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verbose = False
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_colors = {
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'head': 36,
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'good': 32,
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'fail': 31,
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'warn': 33,
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}
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def sep(self):
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print()
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def _colorized(self, color):
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return lambda x: print(color + x + '\033[0m')
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def __getattr__(self, name):
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if self.colors and os.name == 'posix' and name in self._colors:
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color = '\033[0;{0}m'.format(self._colors[name])
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return self._colorized(color)
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else:
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return lambda x: print(x)
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class KexParty(object):
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encryption = []
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mac = []
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compression = []
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languages = []
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class Kex(object):
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cookie = None
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kex_algorithms = []
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key_algorithms = []
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server = KexParty()
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client = KexParty()
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follows = False
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unused = 0
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@classmethod
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def parse(cls, payload):
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kex = cls()
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buf = io.BytesIO(payload)
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kex.cookie = buf.read(16)
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kex.kex_algorithms = read_list(buf)
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kex.key_algorithms = read_list(buf)
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kex.client.encryption = read_list(buf)
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kex.server.encryption = read_list(buf)
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kex.client.mac = read_list(buf)
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kex.server.mac = read_list(buf)
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kex.client.compression = read_list(buf)
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kex.server.compression = read_list(buf)
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kex.client.languages = read_list(buf)
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kex.server.languages = read_list(buf)
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kex.follows = read_bool(buf)
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kex.unused = read_int(buf)
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return kex
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def read_int(buf):
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return struct.unpack('>I', buf.read(4))[0]
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def read_bool(buf):
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return struct.unpack('b', buf.read(1))[0] != 0
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def read_list(buf):
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list_size = read_int(buf)
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return buf.read(list_size).decode().split(',')
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def get_ssh_ver(v):
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return 'available since OpenSSH {0}'.format(v)
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WARN_OPENSSH72_LEGACY = 'removed (in client) since OpenSSH 7.2, legacy algorithm'
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WARN_OPENSSH70_LEGACY = 'removed since OpenSSH 7.0, legacy algorithm'
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FAIL_OPENSSH70_WEAK = 'removed (in server) and disabled (in client) since OpenSSH 7.0, weak algorithm'
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FAIL_OPENSSH70_LOGJAM = 'disabled (in client) since OpenSSH 7.0, logjam attack'
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INFO_OPENSSH69_CHACHA = 'default cipher since OpenSSH 6.9.'
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FAIL_OPENSSH67_UNSAFE = 'removed (in server) since OpenSSH 6.7, unsafe algorithm'
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FAIL_OPENSSH61_REMOVE = 'removed since OpenSSH 6.1, removed from specification'
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FAIL_OPENSSH31_REMOVE = 'removed since OpenSSH 3.1'
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KEX_DB = {
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'kex': {
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'diffie-hellman-group1-sha1': ['2.3.0', [FAIL_OPENSSH67_UNSAFE, FAIL_OPENSSH70_LOGJAM]],
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'diffie-hellman-group14-sha1': ['3.9'],
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'diffie-hellman-group-exchange-sha1': ['2.3.0', [FAIL_OPENSSH67_UNSAFE]],
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'diffie-hellman-group-exchange-sha256': ['4.4'],
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'ecdh-sha2-nistp256': ['5.7'],
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'ecdh-sha2-nistp384': ['5.7'],
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'ecdh-sha2-nistp521': ['5.7'],
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'curve25519-sha256@libssh.org': ['6.5'],
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},
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'key': {
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'ssh-ed25519': ['6.5'],
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'ssh-ed25519-cert-v01@openssh.com': ['6.5'],
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'ssh-rsa': ['2.5.0'],
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'ssh-dss': ['2.1.0', [FAIL_OPENSSH70_WEAK]],
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'ecdsa-sha2-nistp256': ['5.7'],
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'ecdsa-sha2-nistp384': ['5.7'],
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'ecdsa-sha2-nistp521': ['5.7'],
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'ssh-rsa-cert-v00@openssh.com': ['5.4', [], [WARN_OPENSSH70_LEGACY]],
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'ssh-dss-cert-v00@openssh.com': ['5.4', [FAIL_OPENSSH70_WEAK], [WARN_OPENSSH70_LEGACY]],
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'ssh-rsa-cert-v01@openssh.com': ['5.6'],
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'ssh-dss-cert-v01@openssh.com': ['5.6', [FAIL_OPENSSH70_WEAK]],
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'ecdsa-sha2-nistp256-cert-v01@openssh.com': ['5.7'],
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'ecdsa-sha2-nistp384-cert-v01@openssh.com': ['5.7'],
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'ecdsa-sha2-nistp521-cert-v01@openssh.com': ['5.7'],
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},
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'enc': {
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'3des-cbc': ['1.2.2', [FAIL_OPENSSH67_UNSAFE]],
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'blowfish-cbc': ['1.2.2', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'cast128-cbc': ['2.1.0', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'arcfour': ['2.1.0', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'arcfour128': ['4.2', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'arcfour256': ['4.2', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'aes128-cbc': ['2.3.0', [FAIL_OPENSSH67_UNSAFE]],
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'aes192-cbc': ['2.3.0', [FAIL_OPENSSH67_UNSAFE]],
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'aes256-cbc': ['2.3.0', [FAIL_OPENSSH67_UNSAFE]],
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'rijndael128-cbc': ['2.3.0', [FAIL_OPENSSH31_REMOVE]],
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'rijndael192-cbc': ['2.3.0', [FAIL_OPENSSH31_REMOVE]],
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'rijndael256-cbc': ['2.3.0', [FAIL_OPENSSH31_REMOVE]],
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'rijndael-cbc@lysator.liu.se': ['2.3.0', [], [WARN_OPENSSH72_LEGACY]],
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'aes128-ctr': ['3.7'],
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'aes192-ctr': ['3.7'],
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'aes256-ctr': ['3.7'],
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'aes128-gcm@openssh.com': ['6.2'],
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'aes256-gcm@openssh.com': ['6.2'],
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'chacha20-poly1305@openssh.com': ['6.5', [], [], [INFO_OPENSSH69_CHACHA]],
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},
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'mac': {
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'hmac-sha1': ['2.1.0'],
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'hmac-sha1-96': ['2.5.0', [FAIL_OPENSSH67_UNSAFE]],
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'hmac-sha2-256': ['5.9'],
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'hmac-sha2-256-96': ['5.9', [FAIL_OPENSSH61_REMOVE]],
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'hmac-sha2-512': ['5.9'],
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'hmac-sha2-512-96': ['5.9', [FAIL_OPENSSH61_REMOVE]],
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'hmac-md5': ['2.1.0', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'hmac-md5-96': ['2.5.0', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'hmac-ripemd160': ['2.5.0', [FAIL_OPENSSH67_UNSAFE]],
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'hmac-ripemd160@openssh.com': ['2.1.0', [FAIL_OPENSSH67_UNSAFE]],
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'umac-64@openssh.com': ['4.7'],
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'umac-128@openssh.com': ['6.2'],
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'hmac-sha1-etm@openssh.com': ['6.2'],
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'hmac-sha1-96-etm@openssh.com': ['6.2', [FAIL_OPENSSH67_UNSAFE]],
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'hmac-sha2-256-etm@openssh.com': ['6.2'],
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'hmac-sha2-512-etm@openssh.com': ['6.2'],
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'hmac-md5-etm@openssh.com': ['6.2', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'hmac-md5-96-etm@openssh.com': ['6.2', [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]],
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'hmac-ripemd160-etm@openssh.com': ['6.2', [FAIL_OPENSSH67_UNSAFE]],
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'umac-64-etm@openssh.com': ['6.2'],
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'umac-128-etm@openssh.com': ['6.2'],
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}
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}
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def process_algorithms(alg_type, algorithms, maxlen=0):
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for algorithm in algorithms:
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process_algorithm(alg_type, algorithm, maxlen)
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def process_algorithm(alg_type, alg_name, alg_max_len=0):
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prefix = '(' + alg_type + ') '
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if alg_max_len == 0:
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alg_max_len = len(alg_name)
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padding = ' ' * (alg_max_len - len(alg_name))
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texts = []
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if alg_name in KEX_DB[alg_type]:
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alg_desc = KEX_DB[alg_type][alg_name]
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ldesc = len(alg_desc)
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for idx, level in enumerate(['fail', 'warn', 'info']):
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if level == 'info':
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texts.append((level, get_ssh_ver(alg_desc[0])))
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idx = idx + 1
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if ldesc > idx:
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for t in alg_desc[idx]:
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texts.append((level, t))
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if len(texts) == 0:
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texts.append(('info', ''))
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else:
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texts.append(('warn', 'unknown algorithm'))
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first = True
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for (level, text) in texts:
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f = getattr(out, level)
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text = '[' + level + '] ' + text
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if first:
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if first and level == 'info':
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f = out.good
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f(prefix + alg_name + padding + ' -- ' + text)
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first = False
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else:
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if out.verbose:
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f(prefix + alg_name + padding + ' -- ' + text)
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else:
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f(' ' * len(prefix + alg_name) + padding + ' `- ' + text)
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def process_kex(kex):
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state = 'zlib@openssh.com' in kex.server.compression
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state = 'enabled' if state else 'disabled'
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out.good('[info] compression is ' + state)
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ml = lambda l: max(len(i) for i in l)
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maxlen = max(ml(kex.kex_algorithms),
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ml(kex.key_algorithms),
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ml(kex.server.encryption),
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ml(kex.server.mac))
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out.head('\n# key exchange algorithms')
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process_algorithms('kex', kex.kex_algorithms, maxlen)
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out.head('\n# host-key algorithms')
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process_algorithms('key', kex.key_algorithms, maxlen)
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out.head('\n# encryption algorithms (ciphers)')
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process_algorithms('enc', kex.server.encryption, maxlen)
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out.head('\n# message authentication code algorithms')
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process_algorithms('mac', kex.server.mac, maxlen)
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out.sep()
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def read_ssh_packet(s):
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block_size = 8
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header = s.recv(block_size)
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packet_size = struct.unpack('>I', header[:4])[0]
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rest = header[4:]
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lrest = len(rest)
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padding = ord(rest[0:1])
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packet_type = ord(rest[1:2])
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if (packet_size - lrest) % block_size != 0:
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out.fail('[exception] invalid ssh packet (block size)')
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sys.exit(1)
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buf = s.recv(packet_size - lrest)
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packet = rest[2:] + buf[0:packet_size - lrest]
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payload = packet[0:packet_size - padding]
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return packet_type, payload
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def parse_int(v):
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try:
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return int(v)
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except:
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return 0
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def parse_args():
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host = None
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port = 22
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for arg in sys.argv[1:]:
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if arg.startswith('-'):
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arg = arg.lstrip('-')
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if arg == 'n': out.colors = False
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elif arg == 'v': out.verbose = True
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continue
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s = arg.split(':')
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host = s[0].strip()
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if len(s) > 1:
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port = parse_int(s[1])
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if not host or port <= 0:
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usage()
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return host, port
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def main():
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host, port = parse_args()
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s = None
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try:
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s = socket.create_connection((host, port), SOCK_CONN_TIMEOUT)
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s.settimeout(SOCK_READ_TIMEOUT)
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banner = s.recv(1024).strip()
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out.head('# general')
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out.good('[info] banner: ' + banner.decode())
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if banner.decode().startswith('SSH-1.99-'):
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out.fail('[fail] protocol SSH1 enabled')
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s.send(SSH_BANNER.encode() + b'\r\n')
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packet_type, payload = read_ssh_packet(s)
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if packet_type != 20:
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out.fail('[exception] did not receive MSG_KEXINIT (20), instead received unknown message ({0})'.format(packet_type))
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sys.exit(1)
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kex = Kex.parse(payload)
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process_kex(kex)
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except Exception as e:
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out.fail('[fail] {}'.format(e))
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sys.exit(1)
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finally:
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if s:
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s.close()
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if __name__ == '__main__':
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out = Output()
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main()
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