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feat: syn/tcpconnect flood / dos détection

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Oxbian
2024-11-20 21:38:37 -05:00
parent a1dcee53a1
commit d64f7283de
12 changed files with 147 additions and 18 deletions
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8
idps/rules/TCP/Scan/synscan.py
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@ -3,7 +3,7 @@ import time
def rule(packet, tcp_packets, db):
"""Règle SYNScan:
"""Règle SYN Scan:
Un SYNScan va envoyer des requêtes TCP avec le flag SYN
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 répondra: Reset ACK
@ -16,7 +16,11 @@ def rule(packet, tcp_packets, db):
rule.time_window = db.get_key("synscan_time", 180)
rule.seuil = db.get_key("synscan_count", 5)
if tcp_packets.count_packet_of_type(["S", "RA"], rule.time_window, True) + tcp_packets.count_packet_of_type(["S", "SA", "R"], rule.time_window, True) >= rule.seuil:
# Comptage du nombre de scan syn acceptés et refusés
syndeny_count = tcp_packets.count_packet_of_type(["S", "RA"], rule.time_window, True)
synaccept_count = tcp_packets.count_packet_of_type(["S", "SA", "R"], rule.time_window, True)
if (synaccept_count + syndeny_count >= 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 et Syn->Reset ACK", act="Alerte")
print(f"Alerte, seuil dépassés, risque de SynScan")
rule.cooldown = time.time()