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34 lines
1.4 KiB
Python
34 lines
1.4 KiB
Python
from datetime import datetime
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import time
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def rule(packet, tcp_packets, db):
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"""Règle TCPConnect Scan:
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Un scan TCP connect va effectuer une connexion TCP en entier sur chaque port scanné.
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Si le port est ouvert le serveur acceptera la connexion SYN -> SYN ACK -> ACK -> Reset ACK
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Sinon le port est fermé et le serveur refusera la connexion SYN -> Reset ACK
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"""
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if (rule.cooldown + rule.time_window > time.time()):
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return
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# Vérification si nécessaire de récupérer les variables depuis la config
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if (rule.seuil == 0 and rule.time_window == 0):
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rule.time_window = db.get_key("tcpconnectscan_time", 180)
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rule.seuil = db.get_key("tcpconnectscan_count", 5)
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# Comptage du nombre de scan tcp connect acceptés et refusés
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tcpconnectdeny_count = tcp_packets.count_packet_of_type(["S", "RA"], rule.time_window, True)
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tcpconnectaccept_count = tcp_packets.count_packet_of_type(["S", "SA", "A", "RA"], rule.time_window, True)
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if (tcpconnectaccept_count + tcpconnectdeny_count >= rule.seuil):
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db.send_alert(datetime.now(), 5, None, "TCPConnect Scan", packet['IP'].src, packet['IP'].dst, proto="TCP", reason="Détection de nombreux patterns de Syn->SynACK->ACK->Reset ACK et Syn->Reset ACK", act="Alerte")
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print(f"Alerte, seuils dépassés, risque de TCPConnectScan")
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rule.cooldown = time.time()
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# Variables statiques
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rule.cooldown = 0
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rule.time_window = 0
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rule.seuil = 0
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