anti
8dd4c78b33
Rename the container-side logging module decnet_logging → syslog_bridge (canonical at templates/syslog_bridge.py, synced into each template by the deployer). Drop the stale per-template copies; setuptools find was picking them up anyway. Swap useradd/USER/chown "decnet" for "logrelay" so no obvious token appears in the rendered container image. Apply the same cloaking pattern to the telnet template that SSH got: syslog pipe moves to /run/systemd/journal/syslog-relay and the relay is cat'd via exec -a "systemd-journal-fwd". rsyslog.d conf rename 99-decnet.conf → 50-journal-forward.conf. SSH capture script: /var/decnet/captured → /var/lib/systemd/coredump (real systemd path), logger tag decnet-capture → systemd-journal. Compose volume updated to match the new in-container quarantine path. SD element ID shifts decnet@55555 → relay@55555; synced across collector, parser, sniffer, prober, formatter, tests, and docs so the host-side pipeline still matches what containers emit.
162 lines
5.5 KiB
Python
162 lines
5.5 KiB
Python
"""
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Tests for templates/mongodb/server.py
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Covers the MongoDB wire-protocol (OP_MSG / OP_QUERY) happy path and regression
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tests for the zero-length msg_len infinite-loop bug and oversized msg_len.
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"""
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import importlib.util
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import struct
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import sys
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from unittest.mock import MagicMock
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import pytest
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from hypothesis import given, settings
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from hypothesis import strategies as st
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from .conftest import _FUZZ_SETTINGS, make_fake_syslog_bridge, run_with_timeout
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# ── Helpers ───────────────────────────────────────────────────────────────────
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def _load_mongodb():
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for key in list(sys.modules):
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if key in ("mongodb_server", "syslog_bridge"):
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del sys.modules[key]
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sys.modules["syslog_bridge"] = make_fake_syslog_bridge()
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spec = importlib.util.spec_from_file_location("mongodb_server", "templates/mongodb/server.py")
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mod = importlib.util.module_from_spec(spec)
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spec.loader.exec_module(mod)
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return mod
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def _make_protocol(mod):
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proto = mod.MongoDBProtocol()
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transport = MagicMock()
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written: list[bytes] = []
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transport.write.side_effect = written.append
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proto.connection_made(transport)
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return proto, transport, written
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def _minimal_bson() -> bytes:
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return b"\x05\x00\x00\x00\x00" # empty document
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def _op_msg_packet(request_id: int = 1) -> bytes:
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"""Build a valid OP_MSG with an empty BSON body."""
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flag_bits = struct.pack("<I", 0)
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section = b"\x00" + _minimal_bson()
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body = flag_bits + section
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total = 16 + len(body)
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header = struct.pack("<iiii", total, request_id, 0, 2013)
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return header + body
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def _op_query_packet(request_id: int = 2) -> bytes:
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"""Build a minimal OP_QUERY."""
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flags = struct.pack("<I", 0)
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coll = b"admin.$cmd\x00"
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skip = struct.pack("<I", 0)
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ret = struct.pack("<I", 1)
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query = _minimal_bson()
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body = flags + coll + skip + ret + query
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total = 16 + len(body)
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header = struct.pack("<iiii", total, request_id, 0, 2004)
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return header + body
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@pytest.fixture
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def mongodb_mod():
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return _load_mongodb()
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# ── Happy path ────────────────────────────────────────────────────────────────
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def test_op_msg_returns_response(mongodb_mod):
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proto, _, written = _make_protocol(mongodb_mod)
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proto.data_received(_op_msg_packet())
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assert written, "expected a response to OP_MSG"
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def test_op_msg_response_opcode_is_2013(mongodb_mod):
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proto, _, written = _make_protocol(mongodb_mod)
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proto.data_received(_op_msg_packet())
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resp = b"".join(written)
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assert len(resp) >= 16
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opcode = struct.unpack("<i", resp[12:16])[0]
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assert opcode == 2013
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def test_op_query_returns_op_reply(mongodb_mod):
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proto, _, written = _make_protocol(mongodb_mod)
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proto.data_received(_op_query_packet())
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resp = b"".join(written)
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assert len(resp) >= 16
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opcode = struct.unpack("<i", resp[12:16])[0]
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assert opcode == 1
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def test_partial_header_waits_for_more_data(mongodb_mod):
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proto, transport, _ = _make_protocol(mongodb_mod)
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proto.data_received(b"\x1a\x00\x00\x00") # only 4 bytes (< 16)
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transport.close.assert_not_called()
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def test_two_consecutive_messages(mongodb_mod):
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proto, _, written = _make_protocol(mongodb_mod)
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two = _op_msg_packet(1) + _op_msg_packet(2)
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proto.data_received(two)
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assert len(written) >= 2
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def test_connection_lost_does_not_raise(mongodb_mod):
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proto, _, _ = _make_protocol(mongodb_mod)
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proto.connection_lost(None)
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# ── Regression: malformed msg_len ────────────────────────────────────────────
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def test_zero_msg_len_closes(mongodb_mod):
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proto, transport, _ = _make_protocol(mongodb_mod)
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# msg_len = 0 at bytes [0:4] LE — buffer has 16 bytes so outer while triggers
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data = b"\x00\x00\x00\x00" + b"\x00" * 12
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run_with_timeout(proto.data_received, data)
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transport.close.assert_called()
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def test_msg_len_15_closes(mongodb_mod):
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proto, transport, _ = _make_protocol(mongodb_mod)
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# msg_len = 15 (below 16-byte wire-protocol minimum)
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data = struct.pack("<I", 15) + b"\x00" * 12
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run_with_timeout(proto.data_received, data)
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transport.close.assert_called()
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def test_msg_len_over_48mb_closes(mongodb_mod):
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proto, transport, _ = _make_protocol(mongodb_mod)
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# msg_len = 48MB + 1
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big = 48 * 1024 * 1024 + 1
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data = struct.pack("<I", big) + b"\x00" * 12
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run_with_timeout(proto.data_received, data)
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transport.close.assert_called()
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def test_msg_len_exactly_48mb_plus1_closes(mongodb_mod):
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proto, transport, _ = _make_protocol(mongodb_mod)
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# cap is strictly > 48MB, so 48MB+1 must close
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data = struct.pack("<I", 48 * 1024 * 1024 + 1) + b"\x00" * 12
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run_with_timeout(proto.data_received, data)
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transport.close.assert_called()
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# ── Fuzz ──────────────────────────────────────────────────────────────────────
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@pytest.mark.fuzz
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@given(data=st.binary(min_size=0, max_size=512))
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@settings(**_FUZZ_SETTINGS)
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def test_fuzz_arbitrary_bytes(data):
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mod = _load_mongodb()
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proto, _, _ = _make_protocol(mod)
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run_with_timeout(proto.data_received, data)
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