anti
ea340065c6
Extend the passive TLS sniffer with next-gen attacker fingerprinting: - JA4 (ClientHello) and JA4S (ServerHello) computation with supported_versions, signature_algorithms, and ALPN parsing - JA4L latency measurement via TCP SYN→SYN-ACK RTT tracking - TLS session resumption detection (session tickets, PSK, 0-RTT early data) - Certificate extraction for TLS ≤1.2 with minimal DER/ASN.1 parser (subject CN, issuer, SANs, validity period, self-signed flag) - Ingester bounty extraction for all new fingerprint types - 116 tests covering all new functionality (1255 total passing)
405 lines
13 KiB
Python
405 lines
13 KiB
Python
"""Tests for attacker fingerprint extraction in the ingester."""
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import pytest
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from unittest.mock import AsyncMock, MagicMock, call
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from decnet.web.ingester import _extract_bounty
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def _make_repo():
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repo = MagicMock()
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repo.add_bounty = AsyncMock()
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return repo
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# ---------------------------------------------------------------------------
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# HTTP User-Agent
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_http_useragent_extracted():
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repo = _make_repo()
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log_data = {
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"decky": "decky-01",
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"service": "http",
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"attacker_ip": "10.0.0.1",
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"event_type": "request",
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"fields": {
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"method": "GET",
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"path": "/admin",
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"headers": {"User-Agent": "Nikto/2.1.6", "Host": "target"},
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},
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_awaited_once()
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call_kwargs = repo.add_bounty.call_args[0][0]
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assert call_kwargs["bounty_type"] == "fingerprint"
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assert call_kwargs["payload"]["fingerprint_type"] == "http_useragent"
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assert call_kwargs["payload"]["value"] == "Nikto/2.1.6"
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assert call_kwargs["payload"]["path"] == "/admin"
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assert call_kwargs["payload"]["method"] == "GET"
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@pytest.mark.asyncio
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async def test_http_useragent_lowercase_key():
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repo = _make_repo()
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log_data = {
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"decky": "decky-01",
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"service": "http",
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"attacker_ip": "10.0.0.2",
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"event_type": "request",
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"fields": {
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"headers": {"user-agent": "sqlmap/1.7"},
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},
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}
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await _extract_bounty(repo, log_data)
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call_kwargs = repo.add_bounty.call_args[0][0]
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assert call_kwargs["payload"]["value"] == "sqlmap/1.7"
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@pytest.mark.asyncio
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async def test_http_no_useragent_no_fingerprint_bounty():
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repo = _make_repo()
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log_data = {
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"decky": "decky-01",
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"service": "http",
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"attacker_ip": "10.0.0.3",
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"event_type": "request",
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"fields": {
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"headers": {"Host": "target"},
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},
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_not_awaited()
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@pytest.mark.asyncio
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async def test_http_headers_not_dict_no_crash():
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repo = _make_repo()
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log_data = {
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"decky": "decky-01",
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"service": "http",
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"attacker_ip": "10.0.0.4",
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"event_type": "request",
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"fields": {"headers": "raw-string-not-a-dict"},
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_not_awaited()
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# ---------------------------------------------------------------------------
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# VNC client version
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_vnc_client_version_extracted():
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repo = _make_repo()
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log_data = {
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"decky": "decky-02",
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"service": "vnc",
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"attacker_ip": "10.0.0.5",
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"event_type": "version",
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"fields": {"client_version": "RFB 003.008", "src": "10.0.0.5"},
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_awaited_once()
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call_kwargs = repo.add_bounty.call_args[0][0]
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assert call_kwargs["bounty_type"] == "fingerprint"
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assert call_kwargs["payload"]["fingerprint_type"] == "vnc_client_version"
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assert call_kwargs["payload"]["value"] == "RFB 003.008"
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@pytest.mark.asyncio
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async def test_vnc_non_version_event_no_fingerprint():
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repo = _make_repo()
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log_data = {
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"decky": "decky-02",
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"service": "vnc",
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"attacker_ip": "10.0.0.6",
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"event_type": "auth_response",
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"fields": {"client_version": "RFB 003.008", "src": "10.0.0.6"},
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_not_awaited()
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@pytest.mark.asyncio
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async def test_vnc_version_event_no_client_version_field():
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repo = _make_repo()
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log_data = {
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"decky": "decky-02",
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"service": "vnc",
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"attacker_ip": "10.0.0.7",
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"event_type": "version",
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"fields": {"src": "10.0.0.7"},
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_not_awaited()
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# ---------------------------------------------------------------------------
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# Credential extraction unaffected
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_credential_still_extracted_alongside_fingerprint():
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repo = _make_repo()
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log_data = {
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"decky": "decky-03",
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"service": "ftp",
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"attacker_ip": "10.0.0.8",
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"event_type": "auth_attempt",
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"fields": {"username": "admin", "password": "1234"},
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_awaited_once()
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call_kwargs = repo.add_bounty.call_args[0][0]
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assert call_kwargs["bounty_type"] == "credential"
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@pytest.mark.asyncio
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async def test_http_credential_and_fingerprint_both_extracted():
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"""An HTTP login attempt can yield both a credential and a UA fingerprint."""
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repo = _make_repo()
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log_data = {
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"decky": "decky-03",
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"service": "http",
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"attacker_ip": "10.0.0.9",
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"event_type": "request",
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"fields": {
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"username": "root",
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"password": "toor",
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"headers": {"User-Agent": "curl/7.88.1"},
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},
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}
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await _extract_bounty(repo, log_data)
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assert repo.add_bounty.await_count == 2
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types = {c[0][0]["bounty_type"] for c in repo.add_bounty.call_args_list}
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assert types == {"credential", "fingerprint"}
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# ---------------------------------------------------------------------------
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# Edge cases
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_fields_not_dict_no_crash():
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repo = _make_repo()
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log_data = {
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"decky": "decky-04",
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"service": "http",
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"attacker_ip": "10.0.0.10",
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"event_type": "request",
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"fields": None,
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_not_awaited()
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@pytest.mark.asyncio
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async def test_fields_missing_entirely_no_crash():
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repo = _make_repo()
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log_data = {
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"decky": "decky-04",
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"service": "http",
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"attacker_ip": "10.0.0.11",
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"event_type": "request",
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}
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await _extract_bounty(repo, log_data)
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repo.add_bounty.assert_not_awaited()
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# ---------------------------------------------------------------------------
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# JA4/JA4S extraction (sniffer)
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_ja4_included_in_ja3_bounty():
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "sniffer",
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"attacker_ip": "10.0.0.20",
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"event_type": "tls_session",
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"fields": {
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"ja3": "abc123",
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"ja3s": "def456",
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"ja4": "t13d0203h2_aabbccddee00_112233445566",
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"ja4s": "t1302h2_ffeeddccbbaa",
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"tls_version": "TLS 1.3",
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"dst_port": "443",
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},
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}
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await _extract_bounty(repo, log_data)
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calls = repo.add_bounty.call_args_list
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ja3_calls = [c for c in calls if c[0][0]["payload"].get("fingerprint_type") == "ja3"]
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assert len(ja3_calls) == 1
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payload = ja3_calls[0][0][0]["payload"]
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assert payload["ja4"] == "t13d0203h2_aabbccddee00_112233445566"
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assert payload["ja4s"] == "t1302h2_ffeeddccbbaa"
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# ---------------------------------------------------------------------------
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# JA4L latency extraction
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_ja4l_bounty_extracted():
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "sniffer",
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"attacker_ip": "10.0.0.21",
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"event_type": "tls_session",
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"fields": {
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"ja4l_rtt_ms": "12.5",
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"ja4l_client_ttl": "64",
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},
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}
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await _extract_bounty(repo, log_data)
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calls = repo.add_bounty.call_args_list
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ja4l_calls = [c for c in calls if c[0][0]["payload"].get("fingerprint_type") == "ja4l"]
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assert len(ja4l_calls) == 1
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payload = ja4l_calls[0][0][0]["payload"]
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assert payload["rtt_ms"] == "12.5"
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assert payload["client_ttl"] == "64"
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@pytest.mark.asyncio
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async def test_ja4l_not_extracted_without_rtt():
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "sniffer",
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"attacker_ip": "10.0.0.22",
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"event_type": "tls_session",
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"fields": {
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"ja4l_client_ttl": "64",
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},
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}
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await _extract_bounty(repo, log_data)
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calls = repo.add_bounty.call_args_list
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ja4l_calls = [c for c in calls if c[0][0].get("payload", {}).get("fingerprint_type") == "ja4l"]
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assert len(ja4l_calls) == 0
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# ---------------------------------------------------------------------------
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# TLS session resumption extraction
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_tls_resumption_bounty_extracted():
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "sniffer",
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"attacker_ip": "10.0.0.23",
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"event_type": "tls_client_hello",
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"fields": {
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"resumption": "session_ticket,psk",
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},
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}
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await _extract_bounty(repo, log_data)
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calls = repo.add_bounty.call_args_list
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res_calls = [c for c in calls if c[0][0]["payload"].get("fingerprint_type") == "tls_resumption"]
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assert len(res_calls) == 1
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assert res_calls[0][0][0]["payload"]["mechanisms"] == "session_ticket,psk"
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@pytest.mark.asyncio
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async def test_no_resumption_no_bounty():
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "sniffer",
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"attacker_ip": "10.0.0.24",
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"event_type": "tls_client_hello",
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"fields": {
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"ja3": "abc123",
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},
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}
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await _extract_bounty(repo, log_data)
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calls = repo.add_bounty.call_args_list
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res_calls = [c for c in calls if c[0][0]["payload"].get("fingerprint_type") == "tls_resumption"]
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assert len(res_calls) == 0
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# ---------------------------------------------------------------------------
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# TLS certificate extraction
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_tls_certificate_bounty_extracted():
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "sniffer",
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"attacker_ip": "10.0.0.25",
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"event_type": "tls_certificate",
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"fields": {
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"subject_cn": "evil.c2.local",
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"issuer": "CN=Evil CA",
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"self_signed": "true",
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"not_before": "230101000000Z",
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"not_after": "260101000000Z",
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"sans": "evil.c2.local,*.evil.c2.local",
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"sni": "evil.c2.local",
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},
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}
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await _extract_bounty(repo, log_data)
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calls = repo.add_bounty.call_args_list
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cert_calls = [c for c in calls if c[0][0]["payload"].get("fingerprint_type") == "tls_certificate"]
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assert len(cert_calls) == 1
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payload = cert_calls[0][0][0]["payload"]
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assert payload["subject_cn"] == "evil.c2.local"
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assert payload["self_signed"] == "true"
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assert payload["issuer"] == "CN=Evil CA"
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@pytest.mark.asyncio
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async def test_tls_certificate_not_extracted_from_non_sniffer():
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "http",
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"attacker_ip": "10.0.0.26",
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"event_type": "tls_certificate",
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"fields": {
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"subject_cn": "not-from-sniffer.local",
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},
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}
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await _extract_bounty(repo, log_data)
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calls = repo.add_bounty.call_args_list
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cert_calls = [c for c in calls if c[0][0].get("payload", {}).get("fingerprint_type") == "tls_certificate"]
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assert len(cert_calls) == 0
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# ---------------------------------------------------------------------------
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# Multiple fingerprints from single sniffer log
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# ---------------------------------------------------------------------------
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@pytest.mark.asyncio
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async def test_sniffer_log_yields_multiple_fingerprint_types():
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"""A complete TLS session log with JA3 + JA4L + resumption yields 3 bounties."""
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repo = _make_repo()
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log_data = {
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"decky": "decky-05",
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"service": "sniffer",
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"attacker_ip": "10.0.0.30",
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"event_type": "tls_session",
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"fields": {
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"ja3": "abc123",
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"ja3s": "def456",
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"ja4": "t13d0203h2_aabb_ccdd",
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"ja4s": "t1302h2_eeff",
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"ja4l_rtt_ms": "5.2",
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"ja4l_client_ttl": "128",
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"resumption": "session_ticket",
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"tls_version": "TLS 1.3",
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"dst_port": "443",
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},
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}
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await _extract_bounty(repo, log_data)
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assert repo.add_bounty.await_count == 3
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types = {c[0][0]["payload"]["fingerprint_type"] for c in repo.add_bounty.call_args_list}
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assert types == {"ja3", "ja4l", "tls_resumption"}
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