mirror of
https://github.com/jtesta/ssh-audit.git
synced 2024-12-04 16:25:15 +01:00
202 lines
10 KiB
Python
202 lines
10 KiB
Python
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.OutputBuffer, 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(self.OutputBuffer, 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.OutputBuffer, 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) == 83
|
|
|
|
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
|