mirror of https://github.com/jtesta/ssh-audit.git
175 lines
7.4 KiB
Python
175 lines
7.4 KiB
Python
import struct
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import pytest
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from ssh_audit.auditconf import AuditConf
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from ssh_audit.fingerprint import Fingerprint
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from ssh_audit.outputbuffer import OutputBuffer
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from ssh_audit.protocol import Protocol
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from ssh_audit.readbuf import ReadBuf
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from ssh_audit.ssh1 import SSH1
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from ssh_audit.ssh1_publickeymessage import SSH1_PublicKeyMessage
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from ssh_audit.ssh_audit import audit
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from ssh_audit.writebuf import WriteBuf
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# pylint: disable=line-too-long,attribute-defined-outside-init
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class TestSSH1:
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@pytest.fixture(autouse=True)
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def init(self, ssh_audit):
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self.OutputBuffer = OutputBuffer
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self.protocol = Protocol
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self.ssh1 = SSH1
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self.PublicKeyMessage = SSH1_PublicKeyMessage
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self.rbuf = ReadBuf
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self.wbuf = WriteBuf
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self.audit = audit
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self.AuditConf = AuditConf
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self.fingerprint = Fingerprint
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def _conf(self):
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conf = self.AuditConf('localhost', 22)
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conf.colors = False
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conf.batch = True
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conf.verbose = True
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conf.ssh1 = True
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conf.ssh2 = False
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conf.skip_rate_test = True
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return conf
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def _create_ssh1_packet(self, payload, valid_crc=True):
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padding = -(len(payload) + 4) % 8
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plen = len(payload) + 4
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pad_bytes = b'\x00' * padding
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cksum = self.ssh1.crc32(pad_bytes + payload) if valid_crc else 0
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data = struct.pack('>I', plen) + pad_bytes + payload + struct.pack('>I', cksum)
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return data
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@classmethod
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def _server_key(cls):
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return (1024, 0x10001, 0xee6552da432e0ac2c422df1a51287507748bfe3b5e3e4fa989a8f49fdc163a17754939ef18ef8a667ea3b71036a151fcd7f5e01ceef1e4439864baf3ac569047582c69d6c128212e0980dcb3168f00d371004039983f6033cd785b8b8f85096c7d9405cbfdc664e27c966356a6b4eb6ee20ad43414b50de18b22829c1880b551)
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@classmethod
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def _host_key(cls):
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return (2048, 0x10001, 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)
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def _pkm_payload(self):
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w = self.wbuf()
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w.write(b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff')
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b, e, m = self._server_key()
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w.write_int(b).write_mpint1(e).write_mpint1(m)
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b, e, m = self._host_key()
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w.write_int(b).write_mpint1(e).write_mpint1(m)
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w.write_int(2)
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w.write_int(72)
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w.write_int(36)
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return w.write_flush()
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def test_crc32(self):
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assert self.ssh1.crc32(b'') == 0x00
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assert self.ssh1.crc32(b'The quick brown fox jumps over the lazy dog') == 0xb9c60808
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def test_fingerprint(self):
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# pylint: disable=protected-access
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b, e, m = self._host_key()
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fpd = self.wbuf._create_mpint(m, False)
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fpd += self.wbuf._create_mpint(e, False)
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fp = self.fingerprint(fpd)
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assert b == 2048
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assert fp.md5 == 'MD5:9d:26:f8:39:fc:20:9d:9b:ca:cc:4a:0f:e1:93:f5:96'
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assert fp.sha256 == 'SHA256:vZdx3mhzbvVJmn08t/ruv8WDhJ9jfKYsCTuSzot+QIs'
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def _assert_pkm_keys(self, pkm, skey, hkey):
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b, e, m = skey
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assert pkm.server_key_bits == b
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assert pkm.server_key_public_exponent == e
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assert pkm.server_key_public_modulus == m
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b, e, m = hkey
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assert pkm.host_key_bits == b
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assert pkm.host_key_public_exponent == e
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assert pkm.host_key_public_modulus == m
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def _assert_pkm_fields(self, pkm, skey, hkey):
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assert pkm is not None
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assert pkm.cookie == b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
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self._assert_pkm_keys(pkm, skey, hkey)
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assert pkm.protocol_flags == 2
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assert pkm.supported_ciphers_mask == 72
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assert pkm.supported_ciphers == ['3des', 'blowfish']
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assert pkm.supported_authentications_mask == 36
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assert pkm.supported_authentications == ['rsa', 'tis']
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fp = self.fingerprint(pkm.host_key_fingerprint_data)
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assert fp.md5 == 'MD5:9d:26:f8:39:fc:20:9d:9b:ca:cc:4a:0f:e1:93:f5:96'
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assert fp.sha256 == 'SHA256:vZdx3mhzbvVJmn08t/ruv8WDhJ9jfKYsCTuSzot+QIs'
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def test_pkm_init(self):
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cookie = b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
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pflags, cmask, amask = 2, 72, 36
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skey, hkey = self._server_key(), self._host_key()
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pkm = self.PublicKeyMessage(cookie, skey, hkey, pflags, cmask, amask)
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self._assert_pkm_fields(pkm, skey, hkey)
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for skey2 in ([], [0], [0, 1], [0, 1, 2, 3]):
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with pytest.raises(ValueError):
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pkm = self.PublicKeyMessage(cookie, skey2, hkey, pflags, cmask, amask)
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for hkey2 in ([], [0], [0, 1], [0, 1, 2, 3]):
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with pytest.raises(ValueError):
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print(hkey2)
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pkm = self.PublicKeyMessage(cookie, skey, hkey2, pflags, cmask, amask)
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def test_pkm_read(self):
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pkm = self.PublicKeyMessage.parse(self._pkm_payload())
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self._assert_pkm_fields(pkm, self._server_key(), self._host_key())
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def test_pkm_payload(self):
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cookie = b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff'
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skey, hkey = self._server_key(), self._host_key()
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pflags, cmask, amask = 2, 72, 36
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pkm1 = self.PublicKeyMessage(cookie, skey, hkey, pflags, cmask, amask)
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pkm2 = self.PublicKeyMessage.parse(self._pkm_payload())
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assert pkm1.payload == pkm2.payload
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def test_ssh1_server_simple(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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w = self.wbuf()
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w.write_byte(self.protocol.SMSG_PUBLIC_KEY)
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w.write(self._pkm_payload())
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vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n')
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vsocket.rdata.append(self._create_ssh1_packet(w.write_flush()))
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output_spy.begin()
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out = self.OutputBuffer()
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self.audit(out, self._conf())
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out.write()
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lines = output_spy.flush()
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assert len(lines) == 21
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def test_ssh1_server_invalid_first_packet(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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w = self.wbuf()
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w.write_byte(self.protocol.SMSG_PUBLIC_KEY + 1)
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w.write(self._pkm_payload())
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vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n')
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vsocket.rdata.append(self._create_ssh1_packet(w.write_flush()))
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output_spy.begin()
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out = self.OutputBuffer()
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ret = self.audit(out, self._conf())
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out.write()
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assert ret != 0
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lines = output_spy.flush()
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assert len(lines) == 14
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assert 'unknown message' in lines[-1]
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def test_ssh1_server_invalid_checksum(self, output_spy, virtual_socket):
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vsocket = virtual_socket
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w = self.wbuf()
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w.write_byte(self.protocol.SMSG_PUBLIC_KEY + 1)
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w.write(self._pkm_payload())
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vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n')
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vsocket.rdata.append(self._create_ssh1_packet(w.write_flush(), False))
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output_spy.begin()
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out = self.OutputBuffer()
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with pytest.raises(SystemExit):
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self.audit(out, self._conf())
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out.write()
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lines = output_spy.flush()
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assert len(lines) == 3
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assert ('checksum' in lines[0]) or ('checksum' in lines[1]) or ('checksum' in lines[2])
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