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'FireWall KNock OPerator': a port knocker to Linux servers

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. This port installs the client side script that you run to gain access to a Linux box.

Version: 2.6.10 License: GPL-2+ GitHub
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10 build(s) found
Builder Build Number Start Time Elapsed Time Watcher Build Status
14.arm64 8921 2024-01-19 17:55:57 0:00:50 4227 build successful
14 13709 2023-11-25 1:17:50 0:05:09 2172 build successful
13.arm64 9555 2023-03-07 6:23:53 0:00:45 4049 build successful
13 10306 2023-01-01 20:35:24 0:02:03 1362 build successful
12 15051 2022-01-16 10:30:24 0:01:54 3544 build successful
12.arm64 27546 2021-11-24 13:55:11 0:00:49 1547 build successful
11 11863 2021-01-03 14:53:53 0:04:00 1584 build successful
11.arm64 7272 2021-01-03 13:41:36 0:01:18 1681 build successful
10.15 17196 2019-12-27 23:28:42 0:05:14 1729 build successful
10.9 95836 2019-08-25 21:55:46 0:03:28 27005 build successful