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Source: cipherdyne.org - Posted by David Isecke
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fwknop is a flexible port knocking implementation that is based around iptables. Both shared knock sequences and encrypted knock sequences are supported. In addition, fwknop makes use of passive OS fingerprinting signatures derived from p0f to ensure the OS that initiates a knock sequence conforms to a specific type. This makes it possible to allow, say, only Linux systems to connect to your SSH daemon. Both the knock sequences and OS fingerprinting are completely implemented around iptables log messages, and so a separate packet capture library is not required. . . .
fwknop stands for "Firewall Knock Operator" and is an upcoming piece of software that will be released at the DEFCON 12 conference in July, 2004 in Las Vegas.fwknop implements network access controls (via iptables) based on a flexible port knocking mini-language, but with a twist; it combines port knocking and passive operating system fingerprinting to make it possible to do things like only allow, say, Linux-2.4/2.6 systems to connect to your SSH daemon. fwknop supports shared, multi-protocol port knock sequences along with both relative and absolute timeouts, and coded port knock sequences encrypted with the Rijndael block cipher.
Read this full article at cipherdyne.org
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