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Diffstat (limited to 'test/test_ssh1.py')
| -rw-r--r-- | test/test_ssh1.py | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/test/test_ssh1.py b/test/test_ssh1.py new file mode 100644 index 0000000..96e8846 --- /dev/null +++ b/test/test_ssh1.py @@ -0,0 +1,173 @@ +import struct +import pytest + +from ssh_audit.auditconf import AuditConf +from ssh_audit.fingerprint import Fingerprint +from ssh_audit.outputbuffer import OutputBuffer +from ssh_audit.protocol import Protocol +from ssh_audit.readbuf import ReadBuf +from ssh_audit.ssh1 import SSH1 +from ssh_audit.ssh1_publickeymessage import SSH1_PublicKeyMessage +from ssh_audit.ssh_audit import audit +from ssh_audit.writebuf import WriteBuf + + +# pylint: disable=line-too-long,attribute-defined-outside-init +class TestSSH1: + @pytest.fixture(autouse=True) + def init(self, ssh_audit): + self.OutputBuffer = OutputBuffer + self.protocol = Protocol + self.ssh1 = SSH1 + self.PublicKeyMessage = SSH1_PublicKeyMessage + self.rbuf = ReadBuf + self.wbuf = WriteBuf + self.audit = audit + self.AuditConf = AuditConf + self.fingerprint = Fingerprint + + def _conf(self): + conf = self.AuditConf('localhost', 22) + conf.colors = False + conf.batch = True + conf.verbose = True + conf.ssh1 = True + conf.ssh2 = False + return conf + + def _create_ssh1_packet(self, payload, valid_crc=True): + padding = -(len(payload) + 4) % 8 + plen = len(payload) + 4 + pad_bytes = b'\x00' * padding + cksum = self.ssh1.crc32(pad_bytes + payload) if valid_crc else 0 + data = struct.pack('>I', plen) + pad_bytes + payload + struct.pack('>I', cksum) + return data + + @classmethod + def _server_key(cls): + return (1024, 0x10001, 0xee6552da432e0ac2c422df1a51287507748bfe3b5e3e4fa989a8f49fdc163a17754939ef18ef8a667ea3b71036a151fcd7f5e01ceef1e4439864baf3ac569047582c69d6c128212e0980dcb3168f00d371004039983f6033cd785b8b8f85096c7d9405cbfdc664e27c966356a6b4eb6ee20ad43414b50de18b22829c1880b551) + + @classmethod + def _host_key(cls): + return (2048, 0x10001, 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) + + def _pkm_payload(self): + w = self.wbuf() + w.write(b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff') + b, e, m = self._server_key() + w.write_int(b).write_mpint1(e).write_mpint1(m) + b, e, m = self._host_key() + w.write_int(b).write_mpint1(e).write_mpint1(m) + w.write_int(2) + w.write_int(72) + w.write_int(36) + return w.write_flush() + + def test_crc32(self): + assert self.ssh1.crc32(b'') == 0x00 + assert self.ssh1.crc32(b'The quick brown fox jumps over the lazy dog') == 0xb9c60808 + + def test_fingerprint(self): + # pylint: disable=protected-access + b, e, m = self._host_key() + fpd = self.wbuf._create_mpint(m, False) + fpd += self.wbuf._create_mpint(e, False) + fp = self.fingerprint(fpd) + assert b == 2048 + assert fp.md5 == 'MD5:9d:26:f8:39:fc:20:9d:9b:ca:cc:4a:0f:e1:93:f5:96' + assert fp.sha256 == 'SHA256:vZdx3mhzbvVJmn08t/ruv8WDhJ9jfKYsCTuSzot+QIs' + + def _assert_pkm_keys(self, pkm, skey, hkey): + b, e, m = skey + assert pkm.server_key_bits == b + assert pkm.server_key_public_exponent == e + assert pkm.server_key_public_modulus == m + b, e, m = hkey + assert pkm.host_key_bits == b + assert pkm.host_key_public_exponent == e + assert pkm.host_key_public_modulus == m + + def _assert_pkm_fields(self, pkm, skey, hkey): + assert pkm is not None + assert pkm.cookie == b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff' + self._assert_pkm_keys(pkm, skey, hkey) + assert pkm.protocol_flags == 2 + assert pkm.supported_ciphers_mask == 72 + assert pkm.supported_ciphers == ['3des', 'blowfish'] + assert pkm.supported_authentications_mask == 36 + assert pkm.supported_authentications == ['rsa', 'tis'] + fp = self.fingerprint(pkm.host_key_fingerprint_data) + assert fp.md5 == 'MD5:9d:26:f8:39:fc:20:9d:9b:ca:cc:4a:0f:e1:93:f5:96' + assert fp.sha256 == 'SHA256:vZdx3mhzbvVJmn08t/ruv8WDhJ9jfKYsCTuSzot+QIs' + + def test_pkm_init(self): + cookie = b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff' + pflags, cmask, amask = 2, 72, 36 + skey, hkey = self._server_key(), self._host_key() + pkm = self.PublicKeyMessage(cookie, skey, hkey, pflags, cmask, amask) + self._assert_pkm_fields(pkm, skey, hkey) + for skey2 in ([], [0], [0, 1], [0, 1, 2, 3]): + with pytest.raises(ValueError): + pkm = self.PublicKeyMessage(cookie, skey2, hkey, pflags, cmask, amask) + for hkey2 in ([], [0], [0, 1], [0, 1, 2, 3]): + with pytest.raises(ValueError): + print(hkey2) + pkm = self.PublicKeyMessage(cookie, skey, hkey2, pflags, cmask, amask) + + def test_pkm_read(self): + pkm = self.PublicKeyMessage.parse(self._pkm_payload()) + self._assert_pkm_fields(pkm, self._server_key(), self._host_key()) + + def test_pkm_payload(self): + cookie = b'\x88\x99\xaa\xbb\xcc\xdd\xee\xff' + skey, hkey = self._server_key(), self._host_key() + pflags, cmask, amask = 2, 72, 36 + pkm1 = self.PublicKeyMessage(cookie, skey, hkey, pflags, cmask, amask) + pkm2 = self.PublicKeyMessage.parse(self._pkm_payload()) + assert pkm1.payload == pkm2.payload + + def test_ssh1_server_simple(self, output_spy, virtual_socket): + vsocket = virtual_socket + w = self.wbuf() + w.write_byte(self.protocol.SMSG_PUBLIC_KEY) + w.write(self._pkm_payload()) + vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n') + vsocket.rdata.append(self._create_ssh1_packet(w.write_flush())) + output_spy.begin() + out = self.OutputBuffer() + self.audit(out, self._conf()) + out.write() + lines = output_spy.flush() + assert len(lines) == 21 + + def test_ssh1_server_invalid_first_packet(self, output_spy, virtual_socket): + vsocket = virtual_socket + w = self.wbuf() + w.write_byte(self.protocol.SMSG_PUBLIC_KEY + 1) + w.write(self._pkm_payload()) + vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n') + vsocket.rdata.append(self._create_ssh1_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) == 14 + assert 'unknown message' in lines[-1] + + def test_ssh1_server_invalid_checksum(self, output_spy, virtual_socket): + vsocket = virtual_socket + w = self.wbuf() + w.write_byte(self.protocol.SMSG_PUBLIC_KEY + 1) + w.write(self._pkm_payload()) + vsocket.rdata.append(b'SSH-1.5-OpenSSH_7.2 ssh-audit-test\r\n') + vsocket.rdata.append(self._create_ssh1_packet(w.write_flush(), False)) + output_spy.begin() + out = self.OutputBuffer() + with pytest.raises(SystemExit): + self.audit(out, self._conf()) + out.write() + lines = output_spy.flush() + assert len(lines) == 3 + assert ('checksum' in lines[0]) or ('checksum' in lines[1]) or ('checksum' in lines[2]) |