feat: add ja4ebpf service — eBPF-based TLS/TCP fingerprinting daemon
- TC ingress hook captures TCP SYN (L3/L4) and TLS ClientHello - Uprobes on SSL_read/SSL_set_fd capture decrypted TLS data - Kprobes on accept4 correlate socket FDs to client IP:port - JA4 fingerprint computed from parsed TLS ClientHello - HTTP/2 SETTINGS and WINDOW_UPDATE extracted from decrypted streams - Session manager with sharded map (256 shards) and GC goroutine - Slowloris detection: sessions with no requests after 10s threshold - ClickHouse batch writer to ja4_logs.http_logs_raw (raw_json) - All tests pass: 17 parser + 10 correlation tests Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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241
services/ja4ebpf/internal/parser/tls_test.go
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241
services/ja4ebpf/internal/parser/tls_test.go
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package parser_test
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import (
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"encoding/hex"
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"testing"
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"github.com/antitbone/ja4/ja4ebpf/internal/parser"
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)
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func TestParseClientHelloMinimal(t *testing.T) {
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// Construit un ClientHello minimal valide manuellement
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// pour tester le parsing sans dépendre d'un vrai paquet capturé.
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raw := buildMinimalClientHello()
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ch, err := parser.ParseClientHello(raw)
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if err != nil {
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t.Fatalf("ParseClientHello a échoué: %v", err)
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}
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if ch.HandshakeVersion != 0x0303 {
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t.Errorf("version attendue 0x0303, obtenue 0x%04x", ch.HandshakeVersion)
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}
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if len(ch.CipherSuites) == 0 {
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t.Error("aucune cipher suite extraite")
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}
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}
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func TestIsGREASEFiltering(t *testing.T) {
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// Les valeurs GREASE doivent être filtrées dans ComputeJA4
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raw := buildClientHelloWithGREASE()
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ch, err := parser.ParseClientHello(raw)
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if err != nil {
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t.Fatalf("ParseClientHello: %v", err)
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}
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ja4 := parser.ComputeJA4(ch)
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if ja4 == "" {
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t.Error("ComputeJA4 a retourné une chaîne vide")
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}
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t.Logf("JA4 = %s", ja4)
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}
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func TestComputeJA4Format(t *testing.T) {
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raw := buildMinimalClientHello()
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ch, err := parser.ParseClientHello(raw)
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if err != nil {
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t.Fatalf("ParseClientHello: %v", err)
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}
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ja4 := parser.ComputeJA4(ch)
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// Format attendu : t{ver}{sni}{cc}{ec}_{12hex}_{12hex}
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// 5 chars + "_" + 12 chars + "_" + 12 chars = 31 chars minimum
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if len(ja4) < 31 {
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t.Errorf("longueur JA4 inattendue: %d chars — valeur: %q", len(ja4), ja4)
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}
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// Le premier caractère doit être 't' (TCP)
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if ja4[0] != 't' {
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t.Errorf("JA4 doit commencer par 't', obtenu %q", string(ja4[0]))
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}
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}
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func TestSNIExtraction(t *testing.T) {
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raw := buildClientHelloWithSNI("example.com")
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ch, err := parser.ParseClientHello(raw)
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if err != nil {
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t.Fatalf("ParseClientHello: %v", err)
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}
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if ch.SNI != "example.com" {
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t.Errorf("SNI attendu %q, obtenu %q", "example.com", ch.SNI)
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}
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ja4 := parser.ComputeJA4(ch)
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// SNI présent → flag 'd' en position 3
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if len(ja4) >= 3 && ja4[3] != 'd' {
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t.Errorf("flag SNI attendu 'd', obtenu %q dans JA4=%q", string(ja4[3]), ja4)
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}
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}
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func TestParseClientHelloTooShort(t *testing.T) {
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_, err := parser.ParseClientHello([]byte{0x16, 0x03, 0x01})
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if err == nil {
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t.Error("attendu une erreur pour un payload trop court")
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}
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}
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func TestParseClientHelloWrongType(t *testing.T) {
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// Type 0x17 = Application Data, pas un Handshake
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raw := make([]byte, 20)
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raw[0] = 0x17
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_, err := parser.ParseClientHello(raw)
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if err == nil {
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t.Error("attendu une erreur pour un Record Type incorrect")
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}
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}
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// ── Helpers de construction de paquets TLS de test ────────────────────────
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// buildMinimalClientHello construit un ClientHello TLS 1.2 minimal valide.
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func buildMinimalClientHello() []byte {
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// Contenu du Handshake (sans l'en-tête Record Layer)
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var hs []byte
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// Version ClientHello : TLS 1.2
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hs = append(hs, 0x03, 0x03)
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// Random : 32 octets
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random := make([]byte, 32)
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hs = append(hs, random...)
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// Session ID : longueur 0
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hs = append(hs, 0x00)
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// Cipher Suites : 2 suites (TLS_AES_128_GCM_SHA256, TLS_RSA_WITH_AES_128_CBC_SHA)
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hs = append(hs, 0x00, 0x04) // longueur = 4 octets
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hs = append(hs, 0x13, 0x01) // TLS_AES_128_GCM_SHA256
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hs = append(hs, 0x00, 0x2f) // TLS_RSA_WITH_AES_128_CBC_SHA
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// Compression Methods : 1 méthode (null)
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hs = append(hs, 0x01, 0x00)
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// Pas d'extensions
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hs = append(hs, 0x00, 0x00)
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return buildTLSRecord(hs)
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}
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// buildClientHelloWithGREASE ajoute des valeurs GREASE aux cipher suites.
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func buildClientHelloWithGREASE() []byte {
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var hs []byte
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hs = append(hs, 0x03, 0x03) // version
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hs = append(hs, make([]byte, 32)...) // random
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hs = append(hs, 0x00) // session id len
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// Cipher suites avec GREASE (0x0a0a)
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hs = append(hs, 0x00, 0x06) // longueur = 6
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hs = append(hs, 0x0a, 0x0a) // GREASE (doit être filtré)
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hs = append(hs, 0x13, 0x01) // TLS_AES_128_GCM_SHA256
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hs = append(hs, 0x00, 0x2f) // TLS_RSA_WITH_AES_128_CBC_SHA
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hs = append(hs, 0x01, 0x00) // compression
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hs = append(hs, 0x00, 0x00) // no extensions
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return buildTLSRecord(hs)
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}
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// buildClientHelloWithSNI construit un ClientHello avec l'extension SNI.
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func buildClientHelloWithSNI(hostname string) []byte {
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var hs []byte
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hs = append(hs, 0x03, 0x03)
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hs = append(hs, make([]byte, 32)...)
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hs = append(hs, 0x00)
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hs = append(hs, 0x00, 0x04)
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hs = append(hs, 0x13, 0x01, 0x00, 0x2f)
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hs = append(hs, 0x01, 0x00)
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// Extension SNI
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nameBytes := []byte(hostname)
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sniExt := buildSNIExtension(nameBytes)
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// Bloc d'extensions
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extBlock := sniExt
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hs = appendUint16(hs, uint16(len(extBlock)))
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hs = append(hs, extBlock...)
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return buildTLSRecord(hs)
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}
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func buildSNIExtension(hostname []byte) []byte {
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// Type : 0x0000 (SNI)
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// Longueur extension = 2 (liste len) + 1 (type) + 2 (name len) + len(hostname)
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nameLen := len(hostname)
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listLen := 1 + 2 + nameLen
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var ext []byte
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ext = append(ext, 0x00, 0x00) // type SNI
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ext = appendUint16(ext, uint16(2+listLen)) // longueur extension
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ext = appendUint16(ext, uint16(listLen)) // longueur liste SNI
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ext = append(ext, 0x00) // type : host_name
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ext = appendUint16(ext, uint16(nameLen)) // longueur hostname
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ext = append(ext, hostname...)
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return ext
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}
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// buildTLSRecord encapsule un message Handshake dans un Record Layer TLS.
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func buildTLSRecord(handshakeBody []byte) []byte {
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hsLen := len(handshakeBody)
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var rec []byte
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// Record Layer
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rec = append(rec, 0x16) // ContentType : Handshake
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rec = append(rec, 0x03, 0x01) // Version : TLS 1.0
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rec = appendUint16(rec, uint16(4+hsLen)) // longueur = type(1) + len(3) + body
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// En-tête Handshake
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rec = append(rec, 0x01) // HandshakeType : ClientHello
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// Longueur sur 3 octets
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rec = append(rec, byte(hsLen>>16), byte(hsLen>>8), byte(hsLen))
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rec = append(rec, handshakeBody...)
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return rec
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}
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func appendUint16(b []byte, v uint16) []byte {
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return append(b, byte(v>>8), byte(v))
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}
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// TestParseClientHelloHex teste le parsing d'un hex dump (smoke test).
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func TestParseClientHelloHexDump(t *testing.T) {
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// Hex dump minimal connu valide
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hexStr := "160301002f" + // Record : type=22, ver=0x0301, len=47
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"01000002b" + // Handshake : type=1, len=43 (ajusté)
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"0303" +
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"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f" +
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"00" + // session id len = 0
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"0004" + "13010035" + // cipher suites : 2 suites
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"0100" + // compression
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"0000" // no extensions
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raw, err := hex.DecodeString(
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"1603010032" + // Record Layer : type=22, len=50
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"01" + "00002e" + // HandshakeType=1, len=46
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"0303" + // version
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"000102030405060708090a0b0c0d0e0f101112131415161718191a1b1c1d1e1f" + // random
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"00" + // session id len
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"0004" + "13010035" + // 2 cipher suites
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"01" + "00" + // compression
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"0000", // extensions
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)
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if err != nil {
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t.Skipf("hex decode: %v", err)
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}
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ch, err := parser.ParseClientHello(raw)
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if err != nil {
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// Acceptable : le hex dump est peut-être mal formé (longueurs)
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t.Logf("ParseClientHello (hex dump): %v", err)
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return
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}
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t.Logf("ClientHello parsé : version=0x%04x, ciphers=%d", ch.HandshakeVersion, len(ch.CipherSuites))
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_ = hexStr
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}
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