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feat: adding cooldown to alerts + more precise pattern matching for TCP

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Oxbian
2024-11-19 16:42:08 -05:00
parent 48e9554d38
commit 3e75cb8927
3 changed files with 77 additions and 40 deletions
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21
idps/rules/TCP/Scan/synscan.py
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@ -1,4 +1,6 @@
from datetime import datetime
import time
def rule(packet, tcp_packets, db):
"""Règle SYNScan:
@ -6,10 +8,21 @@ def rule(packet, tcp_packets, db):
Si le port est ouvert alors le serveur répondra: Syn ACK, puis le client Reset la connexion
Sinon le port est fermé et le serveur répondera: Reset ACK
"""
if (rule.cooldown + rule.time_window > time.time()):
return
time_window = db.get_key("synscan_time", 180)
seuil = db.get_key("synscan_count", 5)
# Vérification si nécessaire de récupérer les variables depuis la config
if (rule.seuil == 0 and rule.time_window == 0):
rule.time_window = db.get_key("synscan_time", 180)
rule.seuil = db.get_key("synscan_count", 5)
if (tcp_packets.count_packet_of_type("RA", time_window) + tcp_packets.count_packet_of_type("SA", time_window)) + tcp_packets.count_packet_of_type("R", time_window) >= seuil:
db.send_alert(datetime.now(), 5, None, "Syn scan", packet['IP'].src, packet['IP'].dst, proto="TCP", reason="Détection de nombreux patterns de Syn->SynACK->Reset ACK et Syn->Reset ACK", act="Alerte")
if tcp_packets.count_packet_of_type(["S", "RA"], rule.time_window, True) + tcp_packets.count_packet_of_type(["S", "SA", "RA"], rule.time_window, True) >= rule.seuil:
db.send_alert(datetime.now(), 5, None, "Syn scan", packet['IP'].src, packet['IP'].dst, proto="TCP", reason="Détection de nombreux patterns de Syn->SynACK->Reset ACK et Syn->Reset ACK", act="Alerte")
print(f"Alerte, seuil dépassés, risque de SynScan")
rule.cooldown = time.time()
# Variables statiques
rule.cooldown = 0
rule.time_window = 0
rule.seuil = 0