""" Unit tests for flock_tap.py — the passive Flock camera traffic monitor. These lock in the detection/accounting behavior, and in particular guard the three correctness bugs that were fixed: * FRP auth-payload detection must fire on data segments, not only on SYN. * on_tcp_connect must not inflate bytes_up (real byte counts come from ip.len). * connections to a known Flock cloud IP must be flagged even with no SNI/DNS. Pure-logic tests run everywhere; packet-level tests are skipped when scapy is not installed. """ import pytest import flock_tap from flock_tap import FlockTrafficTap HAVE_SCAPY = flock_tap.HAVE_SCAPY requires_scapy = pytest.mark.skipif(not HAVE_SCAPY, reason="scapy not installed") if HAVE_SCAPY: from scapy.all import IP, TCP, Raw def _rebuild(pkt): """Serialize and re-parse so IP.len and offsets are populated like a real capture.""" return IP(bytes(pkt)) @pytest.fixture def tap(): return FlockTrafficTap() # ── _categorize_sni ───────────────────────────────────────────────────────── @pytest.mark.parametrize("sni,expected", [ ("login.flocksafety.com", "auth"), ("prod-flock-cd-xxx.edge.tenants.auth0.com", "auth"), ("flock-hibiki-inbox.s3.us-east-1.amazonaws.com", "s3_upload"), ("api.flocksafety.com", "cloud_api"), ("websockets.flocksafety.com", "cloud_api"), ("example.com", None), ("google.com", None), ]) def test_categorize_sni(tap, sni, expected): assert tap._categorize_sni(sni) == expected # ── on_dns_query ──────────────────────────────────────────────────────────── def test_on_dns_query_flocksafety_counts_cloud_dns(tap): tap.on_dns_query("api.flocksafety.com", "10.0.0.5") assert tap.flow_stats["10.0.0.5"]["cloud_dns"] == 1 def test_on_dns_query_auth0_counts_cloud_dns(tap): # Regression: DNS detection used to match only "flocksafety", ignoring the # Flock auth0 tenant that the SNI path already recognized. tap.on_dns_query("prod-flock-cd-xxx.edge.tenants.auth0.com", "10.0.0.5") assert tap.flow_stats["10.0.0.5"]["cloud_dns"] == 1 def test_on_dns_query_learns_resolved_ips(tap): # Regression: resolved IPs for Flock domains are unioned into known_flock_ips # so later direct-to-IP connections (no SNI/DNS) can still be correlated. tap.on_dns_query("api.flocksafety.com", "10.0.0.5", resolved_ips=["203.0.113.9"]) assert "203.0.113.9" in tap.known_flock_ips def test_on_dns_query_ignores_non_flock(tap): tap.on_dns_query("example.com", "10.0.0.5", resolved_ips=["203.0.113.9"]) assert tap.flow_stats["10.0.0.5"]["cloud_dns"] == 0 assert "203.0.113.9" not in tap.known_flock_ips # ── on_tcp_connect ────────────────────────────────────────────────────────── def test_on_tcp_connect_does_not_inflate_bytes(tap): # Regression: on_tcp_connect used to add a fixed 64 bytes per packet on top # of real ip.len accounting, corrupting bandwidth stats. tap.on_tcp_connect("10.0.0.5", "8.8.8.8", 51000, 443) assert tap.flow_stats["10.0.0.5"]["bytes_up"] == 0 assert tap.flow_stats["10.0.0.5"]["connections"] == 1 def test_on_tcp_connect_frp_port_sets_tunnel(tap): tap.on_tcp_connect("10.0.0.5", "10.0.0.9", 51000, 7000) assert tap.flow_stats["10.0.0.5"]["frp_tunnel"] is True def test_on_tcp_connect_non_frp_port_no_tunnel(tap): tap.on_tcp_connect("10.0.0.5", "10.0.0.9", 51000, 8080) assert tap.flow_stats["10.0.0.5"]["frp_tunnel"] is False # ── on_tls_sni ────────────────────────────────────────────────────────────── def test_on_tls_sni_categories(tap): tap.on_tls_sni("login.flocksafety.com", "10.0.0.5", "1.1.1.1") tap.on_tls_sni("flock-hibiki-inbox.s3.us-east-1.amazonaws.com", "10.0.0.5", "1.1.1.1") tap.on_tls_sni("api.flocksafety.com", "10.0.0.5", "1.1.1.1") fs = tap.flow_stats["10.0.0.5"] assert fs["auth_tls"] == 1 assert fs["s3_uploads"] == 1 assert fs["cloud_api"] == 1 # ── classify_device ───────────────────────────────────────────────────────── def test_classify_device_cloud_dns(tap): tap.flow_stats["ip"]["cloud_dns"] = 1 assert tap.classify_device("ip") == "CLOUD_CONNECTED" def test_classify_device_frp(tap): tap.flow_stats["ip"]["frp_tunnel"] = True assert tap.classify_device("ip") == "CLOUD_CONNECTED" def test_classify_device_cloud_api_only(tap): # The cloud_api-only branch is what surfaces known-Flock-IP correlation. tap.flow_stats["ip"]["cloud_api"] = 1 assert tap.classify_device("ip") == "CLOUD_CONNECTED" def test_classify_device_local_station(tap): tap.flow_stats["ip"]["connections"] = 3 assert tap.classify_device("ip") == "LOCAL_STATION" def test_classify_device_offline(tap): assert tap.classify_device("ip") == "OFFLINE_OR_UNMONITORED" # ── classify_camera (fallback via device data) ────────────────────────────── def test_classify_camera_no_data(tap): assert tap.classify_camera("10.0.0.99") == "NO_DATA" def test_classify_camera_flock_sni_fallback(tap): tap.devices["ip"]["tls_snis"] = [{"sni": "login.flocksafety.com"}] assert tap.classify_camera("ip") == "CLOUD_CONNECTED" def test_classify_camera_local_fallback(tap): tap.devices["ip"]["connections"] = [{"dst": "10.0.0.9"}] assert tap.classify_camera("ip") == "LOCAL_STATION" # ── _parse_tcpdump_line ───────────────────────────────────────────────────── def test_parse_tcpdump_dns(tap): line = "13:37:00.000000 IP 10.0.0.5.54321 > 8.8.8.8.53: 12345+ A? api.flocksafety.com. (36)" parsed = tap._parse_tcpdump_line(line) assert parsed["type"] == "dns" assert parsed["src"] == "10.0.0.5" assert parsed["query"] == "api.flocksafety.com" def test_parse_tcpdump_syn(tap): line = "13:37:00.000000 IP 10.0.0.5.44444 > 10.0.0.9.7000: Flags [S], seq 1, win 64240, length 0" parsed = tap._parse_tcpdump_line(line) assert parsed["type"] == "syn" assert parsed["dport"] == 7000 def test_parse_tcpdump_other(tap): line = "13:37:00.000000 IP 10.0.0.5.44444 > 10.0.0.9.8080: Flags [P.], seq 1:10, length 9" parsed = tap._parse_tcpdump_line(line) assert parsed["type"] == "other" def test_parse_tcpdump_garbage(tap): assert tap._parse_tcpdump_line("not a tcpdump line") is None # ── packet-level regression guards (scapy) ────────────────────────────────── @requires_scapy def test_byte_accounting_matches_ip_len(tap): # bytes_up on the source device must equal the sum of real ip.len values, # with no per-packet inflation. pkts = [ _rebuild(IP(src="10.0.0.5", dst="8.8.8.8") / TCP(dport=443, flags="S")), _rebuild(IP(src="10.0.0.5", dst="8.8.8.8") / TCP(dport=443, flags="PA") / Raw(b"x" * 100)), ] expected = sum(int(p[IP].len) for p in pkts) for p in pkts: tap._handle_packet_scapy(p) assert tap.devices["10.0.0.5"]["bytes_up"] == expected @requires_scapy def test_frp_payload_detected_on_non_syn(tap): # Regression: the FRP auth-payload scan used to be nested in the SYN-only # branch, so it never fired (SYN packets carry no payload). A data segment # (PSH/ACK) carrying the auth JSON must now be detected. pkt = _rebuild( IP(src="10.0.0.5", dst="10.0.0.9") / TCP(sport=51000, dport=12345, flags="PA") / Raw(b'{"proxy_type":"tcp","auth":"token"}') ) tap._handle_packet_scapy(pkt) assert tap.flow_stats["10.0.0.5"]["frp_tunnel"] is True types = [t["type"] for t in tap.devices["10.0.0.5"]["frp_tunnels"]] assert "frp_auth_payload" in types @requires_scapy def test_frp_port_detected_on_syn(tap): pkt = _rebuild(IP(src="10.0.0.5", dst="10.0.0.9") / TCP(sport=51000, dport=7000, flags="S")) tap._handle_packet_scapy(pkt) assert tap.flow_stats["10.0.0.5"]["frp_tunnel"] is True types = [t["type"] for t in tap.devices["10.0.0.5"]["frp_tunnels"]] assert "frp_tunnel" in types @requires_scapy def test_known_flock_ip_correlation(tap): # A camera talking straight to a known Flock cloud IP (no SNI, no DNS of its # own) must still be counted as cloud_api. flock_ip = flock_tap.FLOCK_CLOUD_IPS[0] pkt = _rebuild(IP(src="10.0.0.5", dst=flock_ip) / TCP(sport=51000, dport=443, flags="S")) tap._handle_packet_scapy(pkt) assert tap.flow_stats["10.0.0.5"]["cloud_api"] >= 1 assert tap.classify_device("10.0.0.5") == "CLOUD_CONNECTED"