#!/usr/bin/env python # -*- coding: utf-8 -*- """ The MIT License (MIT) Copyright (C) 2016 Andris Raugulis (moo@arthepsy.eu) Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. """ from __future__ import print_function import os, io, sys, socket, struct, random, errno, getopt, re VERSION = 'v1.0.20160908' SSH_BANNER = 'SSH-2.0-OpenSSH_7.3' def usage(err=None): p = os.path.basename(sys.argv[0]) out.batch = False out.minlevel = 'info' out.head('# {0} {1}, moo@arthepsy.eu'.format(p, VERSION)) if err is not None: out.fail('\n' + err) out.info('\nusage: {0} [-bnv] [-l ] \n'.format(p)) out.info(' -h, --help print this help') out.info(' -b, --batch batch output') out.info(' -n, --no-colors disable colors') out.info(' -v, --verbose verbose output') out.info(' -l, --level= minimum output level (info|warn|fail)') out.sep() sys.exit(1) class Output(object): LEVELS = ['info', 'warn', 'fail'] COLORS = {'head': 36, 'good': 32, 'warn': 33, 'fail': 31} def __init__(self): self.batch = False self.colors = True self.verbose = False self.__minlevel = 0 @property def minlevel(self): return self.__minlevel @minlevel.setter def minlevel(self, name): self.__minlevel = self.getlevel(name) def getlevel(self, name): cname = 'info' if name == 'good' else name if cname not in self.LEVELS: return sys.maxsize return self.LEVELS.index(cname) def sep(self): if not self.batch: print() def _colorized(self, color): return lambda x: print(u'{0}{1}\033[0m'.format(color, x)) def __getattr__(self, name): if name == 'head' and self.batch: return lambda x: None if not self.getlevel(name) >= self.minlevel: return lambda x: None if self.colors and os.name == 'posix' and name in self.COLORS: color = u'\033[0;{0}m'.format(self.COLORS[name]) return self._colorized(color) else: return lambda x: print(u'{0}'.format(x)) class OutputBuffer(list): def __enter__(self): self.__buf = io.StringIO() self.__stdout = sys.stdout sys.stdout = self.__buf return self def flush(self): for line in self: print(line) def __exit__(self, *args): self.extend(self.__buf.getvalue().splitlines()) sys.stdout = self.__stdout class KexParty(object): encryption = [] mac = [] compression = [] languages = [] class Kex(object): cookie = None kex_algorithms = [] key_algorithms = [] server = KexParty() client = KexParty() follows = False unused = 0 @classmethod def parse(cls, payload): kex = cls() buf = ReadBuf(payload) kex.cookie = buf.read(16) kex.kex_algorithms = buf.read_list() kex.key_algorithms = buf.read_list() kex.client.encryption = buf.read_list() kex.server.encryption = buf.read_list() kex.client.mac = buf.read_list() kex.server.mac = buf.read_list() kex.client.compression = buf.read_list() kex.server.compression = buf.read_list() kex.client.languages = buf.read_list() kex.server.languages = buf.read_list() kex.follows = buf.read_bool() kex.unused = buf.read_int() return kex class ReadBuf(object): def __init__(self, data=None): super(ReadBuf, self).__init__() self._buf = io.BytesIO(data) if data else io.BytesIO() self._len = len(data) if data else 0 @property def unread_len(self): return self._len - self._buf.tell() def read(self, size): return self._buf.read(size) def read_line(self): return self._buf.readline().rstrip().decode('utf-8') def read_int(self): return struct.unpack('>I', self.read(4))[0] def read_bool(self): return struct.unpack('b', self.read(1))[0] != 0 def read_list(self): list_size = self.read_int() return self.read(list_size).decode().split(',') class WriteBuf(object): def __init__(self, data=None): super(WriteBuf, self).__init__() self._wbuf = io.BytesIO(data) if data else io.BytesIO() def write(self, data): self._wbuf.write(data) def write_byte(self, v): self.write(struct.pack('>B', v)) def write_bool(self, v): self.write_byte(1 if v else 0) def write_int(self, v): self.write(struct.pack('>I', v)) def write_string(self, v): if not isinstance(v, bytes): v = bytes(bytearray(v, 'utf-8')) n = len(v) self.write(struct.pack('>I', n)) self.write(v) def write_list(self, v): self.write_string(','.join(v)) def write_mpint(self, v): length = v.bit_length() // 8 + 1 data = [(v >> i * 8) & 0xff for i in reversed(range(length))] data = bytes(bytearray(data)) self.write_string(data) class SSH(object): class Protocol(object): MSG_KEXINIT = 20 MSG_NEWKEYS = 21 MSG_KEXDH_INIT = 30 MSG_KEXDH_REPLY = 32 class Product(object): OpenSSH = 'OpenSSH' DropbearSSH = 'Dropbear SSH' class Software(object): def __init__(self, vendor, product, version, patch, os): self.__vendor = vendor self.__product = product self.__version = version self.__patch = patch self.__os = os @property def vendor(self): return self.__vendor @property def product(self): return self.__product @property def version(self): return self.__version @property def patch(self): return self.__patch @property def os(self): return self.__os def compare_version(self, other): if other is None: return 1 if isinstance(other, self.__class__): other = '{0}{1}'.format(other.version, other.patch) else: other = str(other) mx = re.match(r'^([\d\.]+\d+)(.*)$', other) if mx: oversion, opatch = mx.group(1), mx.group(2).strip() else: oversion, opatch = other, '' if self.version < oversion: return -1 elif self.version > oversion: return 1 spatch = self.patch if self.product == SSH.Product.DropbearSSH: if not re.match(r'^test\d.*$', opatch): opatch = 'z{0}'.format(opatch) if not re.match(r'^test\d.*$', self.patch): spatch = 'z{0}'.format(self.patch) elif self.product == SSH.Product.OpenSSH: mx1 = re.match(r'^p\d(.*)', opatch) mx2 = re.match(r'^p\d(.*)', self.patch) if not (mx1 and mx2): if mx1: opatch = mx1.group(1) if mx2: spatch = mx2.group(1) if spatch < opatch: return -1 elif spatch > opatch: return 1 return 0 def between_versions(self, vfrom, vtill): if vfrom and self.compare_version(vfrom) < 0: return False if vtill and self.compare_version(vtill) > 0: return False return True def __str__(self): out = '{0} '.format(self.vendor) if self.vendor else '' out += self.product if self.version: out += ' {0}'.format(self.version) patch = self.patch if self.product == SSH.Product.OpenSSH: mx = re.match('^(p\d)(.*)$', self.patch) if mx is not None: out += mx.group(1) patch = mx.group(2).strip() if patch: out += ' ({0})'.format(self.patch) if self.os: out += ' running on {0}'.format(self.os) return out def __repr__(self): out = 'vendor={0} '.format(self.vendor) if self.vendor else '' if self.product: if self.vendor: out += ', ' out += 'product={0}'.format(self.product) if self.version: out += ', version={0}'.format(self.version) if self.patch: out += ', patch={0}'.format(self.patch) if self.os: out += ', os={0}'.format(self.os) return '<{0}({1})>'.format(self.__class__.__name__, out) @staticmethod def _fix_patch(patch): return re.sub(r'^[-_\.]+', '', patch) @staticmethod def _fix_date(d): if d is not None and len(d) == 8: return '{0}-{1}-{2}'.format(d[:4], d[4:6], d[6:8]) else: return None @classmethod def _extract_os(cls, c): if c is None: return None mx = re.match(r'^NetBSD(?:_Secure_Shell)?(?:[\s-]+(\d{8})(.*))?$', c) if mx: d = cls._fix_date(mx.group(1)) return 'NetBSD' if d is None else 'NetBSD ({0})'.format(d) mx = re.match(r'^FreeBSD(?:\slocalisations)?[\s-]+(\d{8})(.*)$', c) if not mx: mx = re.match(r'^[^@]+@FreeBSD\.org[\s-]+(\d{8})(.*)$', c) if mx: d = cls._fix_date(mx.group(1)) return 'FreeBSD' if d is None else 'FreeBSD ({0})'.format(d) w = ['RemotelyAnywhere', 'DesktopAuthority', 'RemoteSupportManager'] for win_soft in w: mx = re.match(r'^in ' + win_soft + ' ([\d\.]+\d)$', c) if mx: ver = mx.group(1) return 'Microsoft Windows ({0} {1})'.format(win_soft, ver) generic = ['NetBSD', 'FreeBSD'] for g in generic: if c.startswith(g) or c.endswith(g): return g return None @classmethod def parse(cls, banner): software = str(banner.software) mx = re.match(r'^dropbear_([\d\.]+\d+)(.*)', software) if mx: patch = cls._fix_patch(mx.group(2)) v, p = 'Matt Johnston', SSH.Product.DropbearSSH v = None return cls(v, p, mx.group(1), patch, None) mx = re.match(r'^OpenSSH[_\.-]+([\d\.]+\d+)(.*)', software) if mx: patch = cls._fix_patch(mx.group(2)) v, p = 'OpenBSD', SSH.Product.OpenSSH v = None os = cls._extract_os(banner.comments) return cls(v, p, mx.group(1), patch, os) mx = re.match(r'^mpSSH_([\d\.]+\d+)', software) if mx: v, p = 'HP', 'iLO (Integrated Lights-Out) sshd' return cls(v, p, mx.group(1), None, None) mx = re.match(r'^Cisco-([\d\.]+\d+)', software) if mx: v, p = 'Cisco', 'IOS/PIX sshd' return cls(v, p, mx.group(1), None, None) return None class Banner(object): _RXP, _RXR = r'SSH-\d\.\s*?\d+', r'(-([^\s]*)(?:\s+(.*))?)?' RX_PROTOCOL = re.compile(_RXP.replace('\d', '(\d)')) RX_BANNER = re.compile(r'^({0}(?:(?:-{0})*)){1}$'.format(_RXP, _RXR)) def __init__(self, protocol, software, comments): self.__protocol = protocol self.__software = software self.__comments = comments @property def protocol(self): return self.__protocol @property def software(self): return self.__software @property def comments(self): return self.__comments def __str__(self): out = 'SSH-{0}.{1}'.format(self.protocol[0], self.protocol[1]) if self.software is not None: out += '-{0}'.format(self.software) if self.comments: out += ' {0}'.format(self.comments) return out def __repr__(self): p = '{0}.{1}'.format(self.protocol[0], self.protocol[1]) out = 'protocol={0}'.format(p) if self.software: out += ', software={0}'.format(self.software) if self.comments: out += ', comments={0}'.format(self.comments) return '<{0}({1})>'.format(self.__class__.__name__, out) @classmethod def parse(cls, banner): mx = cls.RX_BANNER.match(banner) if mx is None: return None protocol = min(re.findall(cls.RX_PROTOCOL, mx.group(1))) protocol = (int(protocol[0]), int(protocol[1])) software = (mx.group(3) or '').strip() or None if software is None and (mx.group(2) or '').startswith('-'): software = '' comments = (mx.group(4) or '').strip() or None return cls(protocol, software, comments) class Security(object): CVE = { 'Dropbear SSH': [ ['0.44', '2015.71', 'CVE-2016-3116', 5.5, 'bypass command restrictions via xauth command injection.'], ['0.28', '2013.58', 'CVE-2013-4434', 5.0, 'discover valid usernames through different time delays.'], ['0.28', '2013.58', 'CVE-2013-4421', 5.0, 'cause DoS (memory consumption) via a compressed packet.'], ['0.52', '2011.54', 'CVE-2012-0920', 7.1, 'execute arbitrary code or bypass command restrictions.'], ['0.40', '0.48.1', 'CVE-2007-1099', 7.5, 'conduct a MitM attack (no warning for hostkey mismatch).'], ['0.28', '0.47', 'CVE-2006-1206', 7.5, 'cause DoS (slot exhaustion) via large number of connections.'], ['0.39', '0.47', 'CVE-2006-0225', 4.6, 'execute arbitrary commands via scp with crafted filenames.'], ['0.28', '0.46', 'CVE-2005-4178', 6.5, 'execute arbitrary code via buffer overflow vulnerability.'], ['0.28', '0.42', 'CVE-2004-2486', 7.5, 'execute arbitrary code via DSS verification code.'], ] } TXT = { 'Dropbear SSH': [ ['0.28', '0.34', 'remote root exploit', 'remote format string buffer overflow exploit (exploit-db#387).'], ] } class Socket(ReadBuf, WriteBuf): SM_BANNER_SENT = 1 def __init__(self, host, port, cto=3.0, rto=5.0): self.__block_size = 8 self.__state = 0 self.__header = [] self.__banner = None super(SSH.Socket, self).__init__() try: self.__sock = socket.create_connection((host, port), cto) self.__sock.settimeout(rto) except Exception as e: out.fail('[fail] {0}'.format(e)) sys.exit(1) def __enter__(self): return self def get_banner(self): rto = self.__sock.gettimeout() self.__sock.settimeout(0.7) s, e = self.recv() self.__sock.settimeout(rto) if s < 0: return self.__banner, self.__header if self.__state < self.SM_BANNER_SENT: self.send_banner() while self.__banner is None: if not s > 0: s, e = self.recv() if s < 0: break while self.__banner is None and self.unread_len > 0: line = self.read_line() if len(line.strip()) == 0: continue if self.__banner is None: self.__banner = SSH.Banner.parse(line) if self.__banner is not None: continue self.__header.append(line) return self.__banner, self.__header def recv(self, size=2048): try: data = self.__sock.recv(size) except socket.timeout as e: r = 0 if e.strerror == 'timed out' else -1 return (r, e) except socket.error as e: r = 0 if e.errno in (errno.EAGAIN, errno.EWOULDBLOCK) else -1 return (r, e) if len(data) == 0: return (-1, None) pos = self._buf.tell() self._buf.seek(0, 2) self._buf.write(data) self._len += len(data) self._buf.seek(pos, 0) return (len(data), None) def send(self, data): try: self.__sock.send(data) return (0, None) except socket.error as e: return (-1, e) self.__sock.send(data) def send_banner(self, banner=SSH_BANNER): self.send(banner.encode() + b'\r\n') if self.__state < self.SM_BANNER_SENT: self.__state = self.SM_BANNER_SENT def read_packet(self): while self.unread_len < self.__block_size: s, e = self.recv() if s < 0: if e is None: e = self.read(self.unread_len).strip() return -1, e header = self.read(self.__block_size) if len(header) == 0: out.fail('[exception] empty ssh packet (no data)') sys.exit(1) packet_size = struct.unpack('>I', header[:4])[0] rest = header[4:] lrest = len(rest) padding = ord(rest[0:1]) packet_type = ord(rest[1:2]) if (packet_size - lrest) % self.__block_size != 0: out.fail('[exception] invalid ssh packet (block size)') sys.exit(1) rlen = packet_size - lrest while self.unread_len < rlen: s, e = self.recv() if s < 0: if e is None: e = (header + self.read(self.unread_len)).strip() return -1, e buf = self.read(rlen) packet = rest[2:] + buf[0:packet_size - lrest] payload = packet[0:packet_size - padding] return packet_type, payload def send_packet(self): payload = self._wbuf.getvalue() self._wbuf.truncate(0) self._wbuf.seek(0) 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 self.send(data) def __del__(self): self.__cleanup() def __exit__(self, ex_type, ex_value, tb): self.__cleanup() def __cleanup(self): try: self.__sock.shutdown(socket.SHUT_RDWR) self.__sock.close() except: pass class KexDH(object): def __init__(self, alg, g, p): self.__alg = alg self.__g = g self.__p = p self.__q = (self.__p - 1) // 2 self.__x = None def send_init(self, s): r = random.SystemRandom() self.__x = r.randrange(2, self.__q) self.__e = pow(self.__g, self.__x, self.__p) s.write_byte(SSH.Protocol.MSG_KEXDH_INIT) s.write_mpint(self.__e) s.send_packet() class KexGroup1(KexDH): def __init__(self): # rfc2409: second oakley group p = int('ffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67' 'cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6d' 'f25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff' '5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece65381' 'ffffffffffffffff', 16) super(KexGroup1, self).__init__('sha1', 2, p) class KexGroup14(KexDH): def __init__(self): # rfc3526: 2048-bit modp group p = int('ffffffffffffffffc90fdaa22168c234c4c6628b80dc1cd129024e088a67' 'cc74020bbea63b139b22514a08798e3404ddef9519b3cd3a431b302b0a6d' 'f25f14374fe1356d6d51c245e485b576625e7ec6f44c42e9a637ed6b0bff' '5cb6f406b7edee386bfb5a899fa5ae9f24117c4b1fe649286651ece45b3d' 'c2007cb8a163bf0598da48361c55d39a69163fa8fd24cf5f83655d23dca3' 'ad961c62f356208552bb9ed529077096966d670c354e4abc9804f1746c08' 'ca18217c32905e462e36ce3be39e772c180e86039b2783a2ec07a28fb5c5' '5df06f4c52c9de2bcbf6955817183995497cea956ae515d2261898fa0510' '15728e5a8aacaa68ffffffffffffffff', 16) super(KexGroup14, self).__init__('sha1', 2, p) class KexDB(object): WARN_OPENSSH72_LEGACY = 'disabled (in client) since OpenSSH 7.2, legacy algorithm' FAIL_OPENSSH70_LEGACY = 'removed since OpenSSH 7.0, legacy algorithm' FAIL_OPENSSH70_WEAK = 'removed (in server) and disabled (in client) since OpenSSH 7.0, weak algorithm' FAIL_OPENSSH70_LOGJAM = 'disabled (in client) since OpenSSH 7.0, logjam attack' INFO_OPENSSH69_CHACHA = 'default cipher since OpenSSH 6.9.' FAIL_OPENSSH67_UNSAFE = 'removed (in server) since OpenSSH 6.7, unsafe algorithm' FAIL_OPENSSH61_REMOVE = 'removed since OpenSSH 6.1, removed from specification' FAIL_OPENSSH31_REMOVE = 'removed since OpenSSH 3.1' FAIL_DBEAR67_DISABLED = 'disabled since Dropbear SSH 2015.67' FAIL_DBEAR53_DISABLED = 'disabled since Dropbear SSH 0.53' FAIL_PLAINTEXT = 'no encryption/integrity' WARN_CURVES_WEAK = 'using weak elliptic curves' WARN_RNDSIG_KEY = 'using weak random number generator could reveal the key' WARN_MODULUS_SIZE = 'using small 1024-bit modulus' WARN_MODULUS_CUSTOM = 'using custom size modulus (possibly weak)' WARN_HASH_WEAK = 'using weak hashing algorithm' WARN_CIPHER_MODE = 'using weak cipher mode' WARN_BLOCK_SIZE = 'using small 64-bit block size' WARN_CIPHER_WEAK = 'using weak cipher' WARN_ENCRYPT_AND_MAC = 'using encrypt-and-MAC mode' WARN_TAG_SIZE = 'using small 64-bit tag size' ALGORITHMS = { 'kex': { 'diffie-hellman-group1-sha1': [['2.3.0,d0.28', '6.6', '6.9'], [FAIL_OPENSSH67_UNSAFE, FAIL_OPENSSH70_LOGJAM], [WARN_MODULUS_SIZE, WARN_HASH_WEAK]], 'diffie-hellman-group14-sha1': [['3.9,d0.53'], [], [WARN_HASH_WEAK]], 'diffie-hellman-group14-sha256': [['7.3,d2016.73']], 'diffie-hellman-group16-sha512': [['7.3,d2016.73']], 'diffie-hellman-group18-sha512': [['7.3']], 'diffie-hellman-group-exchange-sha1': [['2.3.0', '6.6', None], [FAIL_OPENSSH67_UNSAFE], [WARN_HASH_WEAK]], 'diffie-hellman-group-exchange-sha256': [['4.4'], [], [WARN_MODULUS_CUSTOM]], 'ecdh-sha2-nistp256': [['5.7,d2013.62'], [WARN_CURVES_WEAK]], 'ecdh-sha2-nistp384': [['5.7,d2013.62'], [WARN_CURVES_WEAK]], 'ecdh-sha2-nistp521': [['5.7,d2013.62'], [WARN_CURVES_WEAK]], 'curve25519-sha256@libssh.org': [['6.5,d2013.62']], 'kexguess2@matt.ucc.asn.au': [['d2013.57']], }, 'key': { 'rsa-sha2-256': [['7.2']], 'rsa-sha2-512': [['7.2']], 'ssh-ed25519': [['6.5']], 'ssh-ed25519-cert-v01@openssh.com': [['6.5']], 'ssh-rsa': [['2.5.0,d0.28']], 'ssh-dss': [['2.1.0,d0.28', '6.9'], [FAIL_OPENSSH70_WEAK], [WARN_MODULUS_SIZE, WARN_RNDSIG_KEY]], 'ecdsa-sha2-nistp256': [['5.7,d2013.62'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]], 'ecdsa-sha2-nistp384': [['5.7,d2013.62'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]], 'ecdsa-sha2-nistp521': [['5.7,d2013.62'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]], 'ssh-rsa-cert-v00@openssh.com': [['5.4', '6.9'], [FAIL_OPENSSH70_LEGACY], []], 'ssh-dss-cert-v00@openssh.com': [['5.4', '6.9'], [FAIL_OPENSSH70_LEGACY], [WARN_MODULUS_SIZE, WARN_RNDSIG_KEY]], 'ssh-rsa-cert-v01@openssh.com': [['5.6']], 'ssh-dss-cert-v01@openssh.com': [['5.6', '6.9'], [FAIL_OPENSSH70_WEAK], [WARN_MODULUS_SIZE, WARN_RNDSIG_KEY]], 'ecdsa-sha2-nistp256-cert-v01@openssh.com': [['5.7'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]], 'ecdsa-sha2-nistp384-cert-v01@openssh.com': [['5.7'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]], 'ecdsa-sha2-nistp521-cert-v01@openssh.com': [['5.7'], [WARN_CURVES_WEAK], [WARN_RNDSIG_KEY]], }, 'enc': { 'none': [['1.2.2,d2013.56'], [FAIL_PLAINTEXT]], '3des-cbc': [['1.2.2,d0.28', '6.6', None], [FAIL_OPENSSH67_UNSAFE], [WARN_CIPHER_WEAK, WARN_CIPHER_MODE, WARN_BLOCK_SIZE]], '3des-ctr': [['d0.52']], 'blowfish-cbc': [['1.2.2,d0.28', '6.6,d0.52', '7.1,d0.52'], [FAIL_OPENSSH67_UNSAFE, FAIL_DBEAR53_DISABLED], [WARN_OPENSSH72_LEGACY, WARN_CIPHER_MODE, WARN_BLOCK_SIZE]], 'twofish-cbc': [['d0.28', 'd2014.66'], [FAIL_DBEAR67_DISABLED], [WARN_CIPHER_MODE]], 'twofish128-cbc': [['d0.47', 'd2014.66'], [FAIL_DBEAR67_DISABLED], [WARN_CIPHER_MODE]], 'twofish256-cbc': [['d0.47', 'd2014.66'], [FAIL_DBEAR67_DISABLED], [WARN_CIPHER_MODE]], 'twofish128-ctr': [['d2015.68']], 'twofish256-ctr': [['d2015.68']], 'cast128-cbc': [['2.1.0', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_CIPHER_MODE, WARN_BLOCK_SIZE]], 'arcfour': [['2.1.0', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_CIPHER_WEAK]], 'arcfour128': [['4.2', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_CIPHER_WEAK]], 'arcfour256': [['4.2', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_CIPHER_WEAK]], 'aes128-cbc': [['2.3.0,d0.28', '6.6', None], [FAIL_OPENSSH67_UNSAFE], [WARN_CIPHER_MODE]], 'aes192-cbc': [['2.3.0', '6.6', None], [FAIL_OPENSSH67_UNSAFE], [WARN_CIPHER_MODE]], 'aes256-cbc': [['2.3.0,d0.47', '6.6', None], [FAIL_OPENSSH67_UNSAFE], [WARN_CIPHER_MODE]], 'rijndael128-cbc': [['2.3.0', '3.0.2'], [FAIL_OPENSSH31_REMOVE], [WARN_CIPHER_MODE]], 'rijndael192-cbc': [['2.3.0', '3.0.2'], [FAIL_OPENSSH31_REMOVE], [WARN_CIPHER_MODE]], 'rijndael256-cbc': [['2.3.0', '3.0.2'], [FAIL_OPENSSH31_REMOVE], [WARN_CIPHER_MODE]], 'rijndael-cbc@lysator.liu.se': [['2.3.0', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_CIPHER_MODE]], 'aes128-ctr': [['3.7,d0.52']], 'aes192-ctr': [['3.7']], 'aes256-ctr': [['3.7,d0.52']], 'aes128-gcm@openssh.com': [['6.2']], 'aes256-gcm@openssh.com': [['6.2']], 'chacha20-poly1305@openssh.com': [['6.5'], [], [], [INFO_OPENSSH69_CHACHA]], }, 'mac': { 'none': [['d2013.56'], [FAIL_PLAINTEXT]], 'hmac-sha1': [['2.1.0,d0.28'], [], [WARN_ENCRYPT_AND_MAC, WARN_HASH_WEAK]], 'hmac-sha1-96': [['2.5.0,d0.47', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_ENCRYPT_AND_MAC, WARN_HASH_WEAK]], 'hmac-sha2-256': [['5.9,d2013.56'], [], [WARN_ENCRYPT_AND_MAC]], 'hmac-sha2-256-96': [['5.9', '6.0'], [FAIL_OPENSSH61_REMOVE], [WARN_ENCRYPT_AND_MAC]], 'hmac-sha2-512': [['5.9,d2013.56'], [], [WARN_ENCRYPT_AND_MAC]], 'hmac-sha2-512-96': [['5.9', '6.0'], [FAIL_OPENSSH61_REMOVE], [WARN_ENCRYPT_AND_MAC]], 'hmac-md5': [['2.1.0,d0.28', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_ENCRYPT_AND_MAC, WARN_HASH_WEAK]], 'hmac-md5-96': [['2.5.0', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_ENCRYPT_AND_MAC, WARN_HASH_WEAK]], 'hmac-ripemd160': [['2.5.0', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_ENCRYPT_AND_MAC]], 'hmac-ripemd160@openssh.com': [['2.1.0', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_ENCRYPT_AND_MAC]], 'umac-64@openssh.com': [['4.7'], [], [WARN_ENCRYPT_AND_MAC, WARN_TAG_SIZE]], 'umac-128@openssh.com': [['6.2'], [], [WARN_ENCRYPT_AND_MAC]], 'hmac-sha1-etm@openssh.com': [['6.2'], [], [WARN_HASH_WEAK]], 'hmac-sha1-96-etm@openssh.com': [['6.2', '6.6', None], [FAIL_OPENSSH67_UNSAFE], [WARN_HASH_WEAK]], 'hmac-sha2-256-etm@openssh.com': [['6.2']], 'hmac-sha2-512-etm@openssh.com': [['6.2']], 'hmac-md5-etm@openssh.com': [['6.2', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_HASH_WEAK]], 'hmac-md5-96-etm@openssh.com': [['6.2', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY, WARN_HASH_WEAK]], 'hmac-ripemd160-etm@openssh.com': [['6.2', '6.6', '7.1'], [FAIL_OPENSSH67_UNSAFE], [WARN_OPENSSH72_LEGACY]], 'umac-64-etm@openssh.com': [['6.2'], [], [WARN_TAG_SIZE]], 'umac-128-etm@openssh.com': [['6.2']], } } def get_ssh_version(version_desc): if version_desc.startswith('d'): return (SSH.Product.DropbearSSH, version_desc[1:]) else: return (SSH.Product.OpenSSH, version_desc) def get_alg_timeframe(alg_desc, result={}): versions = alg_desc[0] vlen = len(versions) for i in range(3): if i > vlen - 1: if i == 2 and vlen > 1: cversions = versions[1] else: continue else: cversions = versions[i] if cversions is None: continue for v in cversions.split(','): ssh_prefix, ssh_version = get_ssh_version(v) if ssh_prefix not in result: result[ssh_prefix] = [None, None, None] prev, push = result[ssh_prefix][i], False if prev is None: push = True elif i == 0 and prev < ssh_version: push = True elif i > 0 and prev > ssh_version: push = True if push: result[ssh_prefix][i] = ssh_version return result def get_ssh_timeframe(kex): alg_timeframe = {} algs = {'kex': kex.kex_algorithms, 'key': kex.key_algorithms, 'enc': kex.server.encryption, 'mac': kex.server.mac} for alg_type, alg_list in algs.items(): for alg_name in alg_list: alg_desc = KexDB.ALGORITHMS[alg_type].get(alg_name) if alg_desc is None: continue alg_timeframe = get_alg_timeframe(alg_desc, alg_timeframe) return alg_timeframe def get_alg_since_text(alg_desc): tv = [] versions = alg_desc[0] for v in versions[0].split(','): ssh_prefix, ssh_version = get_ssh_version(v) tv.append('{0} {1}'.format(ssh_prefix, ssh_version)) return 'available since ' + ', '.join(tv).rstrip(', ') def output_algorithms(title, alg_type, algorithms, maxlen=0): with OutputBuffer() as obuf: for algorithm in algorithms: output_algorithm(alg_type, algorithm, maxlen) if len(obuf) > 0: out.head('# ' + title) obuf.flush() out.sep() def output_algorithm(alg_type, alg_name, alg_max_len=0): prefix = '(' + alg_type + ') ' if alg_max_len == 0: alg_max_len = len(alg_name) padding = '' if out.batch else ' ' * (alg_max_len - len(alg_name)) texts = [] if alg_name in KexDB.ALGORITHMS[alg_type]: alg_desc = KexDB.ALGORITHMS[alg_type][alg_name] ldesc = len(alg_desc) for idx, level in enumerate(['fail', 'warn', 'info']): if level == 'info': texts.append((level, get_alg_since_text(alg_desc))) idx = idx + 1 if ldesc > idx: for t in alg_desc[idx]: texts.append((level, t)) if len(texts) == 0: texts.append(('info', '')) else: texts.append(('warn', 'unknown algorithm')) first = True for (level, text) in texts: f = getattr(out, level) text = '[' + level + '] ' + text if first: if first and level == 'info': f = out.good f(prefix + alg_name + padding + ' -- ' + text) first = False else: if out.verbose: f(prefix + alg_name + padding + ' -- ' + text) else: f(' ' * len(prefix + alg_name) + padding + ' `- ' + text) def output_compatibility(kex, client=False): ssh_timeframe = get_ssh_timeframe(kex) cp = 2 if client else 1 comp_text = [] for sshd_name in [SSH.Product.OpenSSH, SSH.Product.DropbearSSH]: if sshd_name not in ssh_timeframe: continue v = ssh_timeframe[sshd_name] if v[cp] is None: comp_text.append('{0} {1}+'.format(sshd_name, v[0])) elif v[0] == v[1]: comp_text.append('{0} {1}'.format(sshd_name, v[0])) else: if v[1] < v[0]: tfmt = '{0} {1}+ (some functionality from {2})' else: tfmt = '{0} {1}-{2}' comp_text.append(tfmt.format(sshd_name, v[0], v[1])) if len(comp_text) > 0: out.good('(gen) compatibility: ' + ', '.join(comp_text)) def output_security_cve(software, padlen): if software is None or software.product not in SSH.Security.CVE: return for line in SSH.Security.CVE[software.product]: vfrom, vtill = line[0:2] if not software.between_versions(vfrom, vtill): continue cve, cvss, descr = line[2:5] padding = '' if out.batch else ' ' * (padlen - len(cve)) out.fail('(cve) {0}{1} -- ({2}) {3}'.format(cve, padding, cvss, descr)) def output_security_txt(software, padlen): if software is None or software.product not in SSH.Security.TXT: return for line in SSH.Security.TXT[software.product]: vfrom, vtill = line[0:2] if not software.between_versions(vfrom, vtill): continue head, descr = line[2:4] padding = '' if out.batch else ' ' * (padlen - len(head)) out.fail('(sec) {0}{1} -- {2}'.format(head, padding, descr)) def output_security(banner, padlen): with OutputBuffer() as obuf: software = SSH.Software.parse(banner) output_security_cve(software, padlen) output_security_txt(software, padlen) if len(obuf) > 0: out.head('# security') obuf.flush() out.sep() def output(banner, header, kex): with OutputBuffer() as obuf: if len(header) > 0: out.info('(gen) header: ' + '\n'.join(header)) if banner is not None: out.good('(gen) banner: {0}'.format(banner)) if banner.protocol[0] == 1: out.fail('(gen) protocol SSH1 enabled') software = SSH.Software.parse(banner) if software is not None: out.good('(gen) software: {0}'.format(software)) if kex is not None: output_compatibility(kex) compressions = [x for x in kex.server.compression if x != 'none'] if len(compressions) > 0: cmptxt = 'enabled ({0})'.format(', '.join(compressions)) else: cmptxt = 'disabled' out.good('(gen) compression: {0}'.format(cmptxt)) if len(obuf) > 0: out.head('# general') obuf.flush() out.sep() if kex is not None: ml = lambda l: max(len(i) for i in l) maxlen = max(ml(kex.kex_algorithms), ml(kex.key_algorithms), ml(kex.server.encryption), ml(kex.server.mac)) else: maxlen = 0 output_security(banner, maxlen) if kex is None: return title, alg_type = 'key exchange algorithms', 'kex' output_algorithms(title, alg_type, kex.kex_algorithms, maxlen) title, alg_type = 'host-key algorithms', 'key' output_algorithms(title, alg_type, kex.key_algorithms, maxlen) title, alg_type = 'encryption algorithms (ciphers)', 'enc' output_algorithms(title, alg_type, kex.server.encryption, maxlen) title, alg_type = 'message authentication code algorithms', 'mac' output_algorithms(title, alg_type, kex.server.mac, maxlen) def parse_int(v): try: return int(v) except: return 0 def parse_args(): host, port = None, 22 try: sopts = 'hbnvl:' lopts = ['help', 'batch', 'no-colors', 'verbose', 'level='] opts, args = getopt.getopt(sys.argv[1:], sopts, lopts) except getopt.GetoptError as err: usage(str(err)) for o, a in opts: if o in ('-h', '--help'): usage() elif o in ('-b', '--batch'): out.batch = True out.verbose = True elif o in ('-n', '--no-colors'): out.colors = False elif o in ('-v', '--verbose'): out.verbose = True elif o in ('-l', '--level'): if a not in ('info', 'warn', 'fail'): usage('level ' + a + ' is not valid') out.minlevel = a if len(args) == 0: usage() s = args[0].split(':') host = s[0].strip() if len(s) > 1: port = parse_int(s[1]) if not host or port <= 0: usage('port {0} is not valid'.format(port)) return host, port def main(): host, port = parse_args() s = SSH.Socket(host, port) err = None banner, header = s.get_banner() if banner is None: err = '[exception] did not receive banner.' if err is None: packet_type, payload = s.read_packet() if packet_type < 0: err = '[exception] error reading packet ({0})'.format(payload) elif packet_type != SSH.Protocol.MSG_KEXINIT: err = '[exception] did not receive MSG_KEXINIT (20), ' + \ 'instead received unknown message ({0})'.format(packet_type) if err: output(banner, header, None) out.fail(err) sys.exit(1) kex = Kex.parse(payload) output(banner, header, kex) if __name__ == '__main__': out = Output() main()