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feat: protection system for the idps

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Oxbian
2024-11-23 12:15:10 -05:00
parent 4b84c4ebb1
commit c4df869596
16 changed files with 259 additions and 145 deletions
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20
idps/rules/TCP/Scan/finscan.py
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@ -2,27 +2,30 @@ from datetime import datetime
import time
def rule(packet, tcp_packets, db):
def rule(packet, objets):
"""Règle Fin Scan:
Un Fin Scan va envoyer des requêtes TCP avec le flag Fin
Si le port est ouvert alors le serveur répondra pas
Sinon le port est fermé et le serveur répondra: Reset ACK
"""
if (rule.cooldown + rule.time_window > time.time()):
return
# 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("finscan_time", 180)
rule.seuil = db.get_key("finscan_count", 5)
if (rule.seuil == 0 and rule.time_window == 0 and rule.ban_time == 0):
rule.time_window = objets["config"].get("finscan_time", 180)
rule.seuil = objets["config"].get("finscan_count", 5)
rule.ban_time = objets["config"].get("finscan_bantime", 300)
# Comptage du nombre de scan fin acceptés et refusés
findeny_count = tcp_packets.count_packet_of_type(["F", "RA"], rule.time_window, True)
finaccept_count = tcp_packets.count_packet_of_type(["F"], rule.time_window, True)
findeny_count = objets["tcp_packets"].count_packet_of_type(["F", "RA"], rule.time_window, True)
finaccept_count = objets["tcp_packets"].count_packet_of_type(["F"], rule.time_window, True)
if (findeny_count + finaccept_count >= rule.seuil):
db.send_alert(datetime.now(), 5, None, "Fin scan", packet['IP'].src, packet['IP'].dst, proto="TCP", reason="Détection de nombreux patterns de Fin->Reset Ack et Fin->rien", act="Alerte")
print(f"Alerte, seuil dépassés, risque de Fin Scan")
objets["database"].send_alert(datetime.now(), 5, None, "Fin scan", objets["pkt_origin"][0], objets["pkt_origin"][2], proto="TCP", reason="Détection de nombreux patterns de Fin->Reset Ack et Fin->rien", act="Alerte")
objets["iptables_manager"].add_rule("iptables -I FORWARD -s " + objets["pkt_origin"][0] + " -j DROP", rule.ban_time)
print("Alerte, seuil dépassés, risque de Fin Scan")
rule.cooldown = time.time()
@ -30,3 +33,4 @@ def rule(packet, tcp_packets, db):
rule.cooldown = 0
rule.time_window = 0
rule.seuil = 0
rule.ban_time = 0