Package: wnpp Severity: wishlist Description (from URL): fwknop stands for the "FireWall KNock OPerator", and implements an authorization scheme called Single Packet Authorization (SPA) that is based around Netfilter and libpcap. SPA requires only a single encrypted packet in order to communicate various pieces of information including desired access through a Netfilter policy and/or complete commands to execute on the target system. By using Netfilter to maintain a "default drop" stance, the main application of this program is to protect services such as OpenSSH with an additional layer of security in order to make the exploitation of vulnerabilities (both 0-day and unpatched code) much more difficult. The authorization server passively monitors authorization packets via libcap and hence there is no "server" to which to connect in the traditional sense. Access to a protected service is only granted after a valid encrypted and non-replayed packet is monitored.
Advantages over Port Knocking: + SPA can utilize asymmetric ciphers for encryption + SPA packets are non-replayable + SPA cannot be broken by trivial sequence busting attacks + SPA only sends a single packet over the network + SPA is much faster + SPA is compatible with 2048-bit Elgamal GnuPG keys Tools provided within the Package: + fwknop (8), fwknop client + fwknopd (8), fwknopd Single Packet Authorization (SPA) server + knopmd (8), legacy daemon to acquire Netfilter log messages for deprecated port knocking mode. + knopwatchd (8), process monitoring daemon for fwknop daemons. Copyright: GPL URL: http://www.cipherdyne.org/fwknop/ -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]