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IPT_PKD Iptables Port Knocking Detection 1.10

Posted Jan 23, 2012

Authored by eric

ipt_pkd is an iptables extension implementing port knock detection with SPA (single packet authorization). This project provides 3 parts: the kernel module ipt_pkd, the iptables user space module libipt_pkd.so, and a user space client knock program. For the knock packet, it uses a UDP packet sent to a random port that contains a SHA-256 of a timestamp, small header, random bytes, and a shared key. ipt_pkd checks the time window of the packet and does the SHA-256 to verify the packet. The shared key is never sent.

Changes: This release has been updated for Linux 3.x, and tested with Linux 3.2 and iptables 1.4.12.2.

tags | tool, kernel, udp, firewall

systems | linux

SHA-256 | 55175736a0aab53c4fd0bf06c3f44e0984708faf5114baa47134e8aef4661b7f

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