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 conf.skip_rate_test = True 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) == 13 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) == 6 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])