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Fwknop Port Knocking Utility

Fwknop Port Knocking Utility
Posted Sep 10, 2009
Authored by Michael Rash | Site cipherdyne.org

fwknop implements an authorization scheme that requires only a single encrypted packet to communicate various pieces of information, including desired access through a Netfilter policy and/or specific commands to execute on the target system. The main application of this program is to protect services such as SSH with an additional layer of security in order to make the exploitation of vulnerabilities much more difficult. The authorization server works by passively monitoring authorization packets via libpcap.

Changes: The FKO module that is part of the libfko library was fully integrated for all SPA routines: encryption/decryption, digest calculation, replay attack detection, etc. The ability to recover from interface error conditions was added, such as when fwknopd sniffs a ppp interface (say, associated with a VPN) that goes away and then is recreated. The fwknop client was updated to include the SPA destination before DNS resolution when sending an SPA packet over an HTTP request.
tags | tool, scanner, vulnerability
systems | unix
SHA-256 | b4fcde370773c710927230c0d84100a4aaa2060eb497cf896a97d752b2856e87
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