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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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10
idps/rules/TCP/Scan/tcpconnectscan.py
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@ -17,7 +17,11 @@ def rule(packet, tcp_packets, db):
rule.time_window = db.get_key("tcpconnectscan_time", 180)
rule.seuil = db.get_key("tcpconnectscan_count", 5)
if tcp_packets.count_packet_of_type(["S", "SA", "A", "RA"], rule.time_window, True) + tcp_packets.count_packet_of_type(["S", "RA"], rule.time_window, True) >= rule.seuil:
# Comptage du nombre de scan tcp connect acceptés et refusés
tcpconnectdeny_count = tcp_packets.count_packet_of_type(["S", "RA"], rule.time_window, True)
tcpconnectaccept_count = tcp_packets.count_packet_of_type(["S", "SA", "A", "RA"], rule.time_window, True)
if (tcpconnectaccept_count + tcpconnectdeny_count >= rule.seuil):
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")
print(f"Alerte, seuils dépassés, risque de TCPConnectScan")
rule.cooldown = time.time()
@ -25,5 +29,5 @@ def rule(packet, tcp_packets, db):
# Variables statiques
rule.cooldown = 0
rule.time_window = 180
rule.seuil = 5
rule.time_window = 0
rule.seuil = 0