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ssh-audit/test/test_ssh2.py

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import os
import struct
import pytest
from ssh_audit.auditconf import AuditConf
from ssh_audit.outputbuffer import OutputBuffer
from ssh_audit.protocol import Protocol
from ssh_audit.readbuf import ReadBuf
from ssh_audit.ssh2_kex import SSH2_Kex
from ssh_audit.ssh2_kexparty import SSH2_KexParty
from ssh_audit.ssh_audit import audit
from ssh_audit.writebuf import WriteBuf
# pylint: disable=line-too-long,attribute-defined-outside-init
class TestSSH2:
@pytest.fixture(autouse=True)
def init(self, ssh_audit):
self.OutputBuffer = OutputBuffer
self.protocol = Protocol
self.ssh2_kex = SSH2_Kex
self.ssh2_kexparty = SSH2_KexParty
self.rbuf = ReadBuf
self.wbuf = WriteBuf
self.audit = audit
self.AuditConf = 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(['bogus_kex1', 'bogus_kex2']) # We use a bogus kex, otherwise the host key tests will kick off and fail.
w.write_list(['ssh-rsa', 'rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519'])
w.write_list(['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc'])
w.write_list(['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc'])
w.write_list(['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1'])
w.write_list(['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1'])
w.write_list(['none', 'zlib@openssh.com'])
w.write_list(['none', 'zlib@openssh.com'])
w.write_list([''])
w.write_list([''])
w.write_byte(False)
w.write_int(0)
return w.write_flush()
def _kex_payload_with_gss(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(['gss-gex-sha1-dZuIebMjgUqaxvbF7hDbAw==', 'gss-gex-sha1-vz8J1E9PzLr8b1K+0remTg==', 'gss-group14-sha1-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group14-sha1-vz8J1E9PzLr8b1K+0remTg==', 'gss-group14-sha256-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group14-sha256-vz8J1E9PzLr8b1K+0remTg==', 'gss-group16-sha512-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group16-sha512-vz8J1E9PzLr8b1K+0remTg==', 'gss-group18-sha512-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group18-sha512-vz8J1E9PzLr8b1K+0remTg==', 'gss-group1-sha1-dZuIebMjgUqaxvbF7hDbAw==', 'gss-group1-sha1-vz8J1E9PzLr8b1K+0remTg==', 'gss-curve448-sha512-XXX'])
w.write_list(['ssh-ed25519'])
w.write_list(['chacha20-poly1305@openssh.com'])
w.write_list(['chacha20-poly1305@openssh.com'])
w.write_list(['hmac-sha2-512-etm@openssh.com'])
w.write_list(['hmac-sha2-512-etm@openssh.com'])
w.write_list(['none', 'zlib@openssh.com'])
w.write_list(['none', 'zlib@openssh.com'])
w.write_list([''])
w.write_list([''])
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 == ['bogus_kex1', 'bogus_kex2']
assert kex.key_algorithms == ['ssh-rsa', 'rsa-sha2-512', 'rsa-sha2-256', 'ssh-ed25519']
assert kex.client is not None
assert kex.server is not None
assert kex.client.encryption == ['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc']
assert kex.server.encryption == ['chacha20-poly1305@openssh.com', 'aes128-ctr', 'aes192-ctr', 'aes256-ctr', 'aes128-gcm@openssh.com', 'aes256-gcm@openssh.com', 'aes128-cbc', 'aes192-cbc', 'aes256-cbc']
assert kex.client.mac == ['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1']
assert kex.server.mac == ['umac-64-etm@openssh.com', 'umac-128-etm@openssh.com', 'hmac-sha2-256-etm@openssh.com', 'hmac-sha2-512-etm@openssh.com', 'hmac-sha1-etm@openssh.com', 'umac-64@openssh.com', 'umac-128@openssh.com', 'hmac-sha2-256', 'hmac-sha2-512', 'hmac-sha1']
assert kex.client.compression == ['none', 'zlib@openssh.com']
assert kex.server.compression == ['none', 'zlib@openssh.com']
assert kex.client.languages == ['']
assert kex.server.languages == ['']
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.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()
out = self.OutputBuffer()
self.audit(out, self._conf())
out.write()
lines = output_spy.flush()
assert len(lines) == 70
def test_ssh2_server_invalid_first_packet(self, output_spy, virtual_socket):
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.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()
out = self.OutputBuffer()
ret = self.audit(out, self._conf())
out.write()
assert ret != 0
lines = output_spy.flush()
assert len(lines) == 9
assert 'unknown message' in lines[-1]
def test_ssh2_gss_kex(self, output_spy, virtual_socket):
'''Ensure that GSS kex algorithms are properly parsed.'''
vsocket = virtual_socket
w = self.wbuf()
w.write_byte(self.protocol.MSG_KEXINIT)
w.write(self._kex_payload_with_gss()) # Use the kex with GSS algorithms.
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()
out = self.OutputBuffer()
self.audit(out, self._conf())
out.write()
lines = output_spy.flush()
# Ensure that none of the lines are reported as "unknown algorithm".
for line in lines:
assert line.find('unknown algorithm') == -1
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