Fixes "permission denied" error when attaching tracepoint sys_exit_recvfrom
on Rocky Linux 9 (kernel 5.14+). The tracepoint exit has stricter permissions
than entry tracepoints.
Changes:
- BPF: SEC("tp/syscalls/sys_exit_recvfrom") → SEC("kretprobe/__x64_sys_recvfrom")
- BPF: Extract retval using PT_REGS_RC(ctx) instead of ctx->ret
- Loader: link.Tracepoint() → link.Kretprobe()
- Add nginxPidMap for filtering recvfrom calls by nginx PID
Validation:
- All HTTP fields captured without truncation (path up to 39 chars, query up to 244 chars)
- Custom headers (X-Request-ID, X-Custom-Header) fully captured
- Unit tests added and passing (TestKretprobeRecvfromAttachment, TestKretprobeVsTracepoint)
- ClickHouse validation complete: http_logs and http_logs_raw tables verified
Tested on:
- Rocky Linux 9 (kernel 5.14+)
- bpftool shows: kprobe name tp_sys_exit_recvfrom (kretprobe active)
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add initial implementation of nginx uprobes to capture complete HTTP
headers at application layer. This addresses the limitation of TC-based
capture which truncates headers spanning multiple packets.
Changes:
- Add uprobe_nginx.c with read() syscall interception
- Add nginx_read_args map for uretprobe correlation
- Add AttachUprobesNginx() method with retry support
- Config via uprobes.enabled in YAML or JA4EBPF_UPROBES_ENABLED env var
Current status:
- ✅ HTTPS (TLS) capture works perfectly - complete headers via SSL_read
- ❌ HTTP plain nginx uprobes don't fire - nginx uses recv() not read()
- ⚠️ HTTP plain TC capture truncates headers (fundamental limitation)
Note: The nginx uprobes approach has limitations:
1. nginx uses recv()/recvmsg() syscalls, not read()
2. PLT attachment to glibc recv() doesn't trigger properly
3. Consider kprobes on sys_recvfrom or packet reassembly for future
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add dst_ip and dst_port fields to tls_hello_event BPF struct and populate
them in tc_capture.c. Update Go TLS event handler with new byte offsets
(payload[2048]+src_ip(4)+dst_ip(4)+src_port(2)+dst_port(2)+payload_len(2)+
timestamp_ns(8) = 2070 bytes). Read dst_ip/dst_port from HTTP plain events
and use them to populate L3L4 when SYN was not captured, ensuring dst_ip
and dst_port are always available in ClickHouse for both TLS and HTTP sessions.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Fix two critical offset bugs introduced when ip_total_length was added to
tcp_syn_event: tcp_options_raw offset 21→23 and tcp_options_len offset 61→63,
plus minimum size check 70→72. Fix ssl_data_event direction field offset from
4118 (inside timestamp_ns) to 4126. Simplify attachSSLWrite to use generated
objects directly instead of dynamic spec loading. Regenerate BPF objects with
SSL_write uprobe programs included.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add uprobe_ssl_write_entry/uretprobe_ssl_write_exit to capture server HTTP
responses via SSL_write with direction=1. Implement full HPACK decoder
(RFC 7541 static table, multi-byte integers, literal representations) for
HTTP/2 header extraction. Add AcceptCache mapping {tgid,fd}→SessionKey
from accept4 events as authoritative source for SSL correlation when BPF
ssl_conn_map has src_ip=0. Add ip_total_length to tcp_syn_event BPF struct.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add run-e2e-test.sh with CLI parameters (--hits, --http-ratio, --dns, --tls,
--src-ips, --keep-analysis, --up) for configurable traffic generation. Traffic
runs from VM endpoints with multiple source IPs (alias IPs on eth0) to produce
distinct sessions for the ML pipeline. Fix curl TLS flags (--tlsv1.2 instead
of --tls-v1-2), skip redundant local verification in distributed mode, and
fix dashboard is_available() cache that never retried after ClickHouse recovery.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add .gitignore rules for generated CSV data, eBPF compiled objects,
and vmlinux.h header. Remove 19 tracked files (~175 MB) that can be
regenerated from scripts (generate_*.py), bpftool, or bpf2go.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
- Increase MAX_TLS_PAYLOAD from 512 to 2048 bytes to capture full
TLS ClientHellos (modern browsers/curl send 1000-1543 byte ClientHellos)
- Fix ParseClientHello to tolerate XDP-truncated payloads: clamp
recordLength and chLen to available data instead of returning error
- Fix cipher suites, compression, extensions truncation to use clamping
- Fix consumeSynEvents struct field offsets: dst_ip (4 bytes at offset 4)
was not accounted for, causing all L3/L4 metadata to be read from
wrong positions (TTL was actually dst_ip[0], windowSize was dst_port, etc.)
- Add parseTCPOptions() to extract MSS and Window Scale from raw TCP options
(C code sets defaults of mss=0, window_scale=0xFF, expects Go to parse)
- Fix consumeAcceptEvents: skip zero-IP events to avoid phantom sessions
- Fix consumeSSLEvents: filter zero-IP/port events when proc fallback fails
- Add missing consumeHTTPPlainEvents goroutine (was defined but never called)
- Fix race condition: SYN consumer sets Correlated=true if TLS already present
- Update tls_hello_event struct offsets in Go consumer (payload_len now at
offset 2054, was 518, due to payload array growing from 512 to 2048 bytes)
- Remove debug logging from consumers and GC
E2E verified: HTTP plain (port 80) and HTTPS (port 443) both produce
fully correlated sessions in ClickHouse with correct:
- ip_meta_ttl=64, ip_meta_df=true, ip_meta_id
- tcp_meta_window_size=64240, tcp_meta_window_scale=10, tcp_meta_mss=1460
- ja4=t13i3010_1d37bd780c83_95d2a80e6515
- tls_alpn=http/1.1
- method=GET, path=/, header_order_signature=Host;User-Agent;Accept
- correlated=1
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
- Use two separate //go:generate directives (Ja4Tc for tc_capture.c, Ja4Ssl
for uprobe_ssl.c) to avoid duplicate LICENSE symbol and multi-file clang issue
- Update loader.go to hold tcObjs/sslObjs separately with correct field names:
UprobeSslSetFd, UprobeSslReadEntry, UretprobeSslReadExit,
KprobeAccept4Entry, KretprobeAccept4Exit
- Add systemd-rpm-macros to all three RPM build stages (el8/el9/el10)
so that %{_unitdir} macro resolves correctly
- RPMs now build successfully for el8, el9, el10
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
