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Jonathan Bennett
- Major contributor.
- Contributed OpenWRT support - see the extras/openwrt/ directory.
- Suggested the addition of the --key-gen option to fwknopd.
- Contributed the console-qr.sh script (in extras/console-qr/) to create
QR codes from fwknopd access.conf keys.
- Wrote a new fwknop client for Android called "Fwknop2" - see:
https://f-droid.org/repository/browse/?fdid=org.cipherdyne.fwknop2
- Developed the access.conf %include and %include_folder directives.
- Developed a cross-platform UI for the fwknop client. This UI runs on
Linux, Windows, and Mac OS X.
Sebastien Jeanquier
- Assisted with getting fwknop included in BackTrack Linux - the choice
distro for pentration testers.
Ozmart
- Suggested the idea for setting an access stanza expiration time.
- Suggested the abiliy to have certain incoming connections automatically
NAT'd through to specific internal systems. The result was the FORCE_NAT
mode.
- Assisted with getting fwknop running under the Pentoo Linux distro.
Max Kastanas
- Contributed both an Android and an iPhone fwknop client port - see the
top level android/ and iphone/ directories.
Ted Wynnychenko
- Helped test fwknop PF support on OpenBSD.
Andy Rowland
- Reported a bug where the same encryption key used for two stanzas in the
access.conf file would result in access requests that matched the second
stanza to always be treated as a replay attack. This has been fixed for
the fwknop-2.0.1 release.
C Anthony Risinger
- Caught a bug where the default PCAP_LOOP_SLEEP value was 1/100th of a
second instead of the intended default of 1/10th of a second.
Franck Joncourt
- fwknop Debian package maintainer.
- Contributed a new Debian init script.
- Contributed a patch to have the perl FKO module link against libfko in
the local directory (if it exists) so that it doesn't have to have libfko
completely installed in /usr/lib/. This allows the test suite to run FKO
tests without installing libfko.
- Contributed a patch to remove unnecessary chmod() call when creating
client rc file and server replay cache file. The permissions are now set
appropriately via open(), and at the same time this patch fixes a
potential race condition since the previous code used fopen() followed by
chmod().
- Contributed a patch to allow the fwknop client to be stopped with Ctrl-C
before sending an SPA packet on the wire.
- Contributed a patch to ensure that duplicate iptables rules are not
created even for different SPA packets that arrive at the same time and
request the same access.
- Added support for resolving hostnames in various NAT modes (fixes issue
#43 in github).
- Bug fix in the client for resolving hostnames in '-P icmp' mode (fixes
issue #64).
- Added support for saving fwknop client command line arguments via a new
option --save-rc-stanza.
- Added log module support for the client.
- Added the ability to read a passphrase from STDIN and also from a file
descriptor via --fd (closes #74).
- Added libfko unit tests via the CUnit framework.
Jonathan Schulz
- Submitted patches to change HTTP connection type to 'close' for -R mode
in the client and fix a bug for recv() calls against returned HTTP data.
Aldan Beaubien
- Reported an issue with the Morpheus client sending SPA packets with NULL
IP addresses, and code was added to fwknopd to better validate incoming
SPA data as a result of this report.
Geoff Carstairs
- Suggested a way to redirect valid connection requests to a specific
internal service via NAT, configurable by each stanza in access.conf.
This allows for better access control for multple users requiring access
to multiple internal systems, in a manner that is transparent to the
user. The result was the FORCE_NAT mode.
Hank Leininger
- Contributed a patch to greatly extend libfko error code descriptions at
various places in order to give much better information on what certain
error conditions mean. Closes #98.
- Suggested the ability to read a passphrase from STDIN and via a new --fd
command line argument (github #74) to allow things like:
$ gpg -d passphrasefile.pgp | fwknop -R -n myserver
- For iptables firewalls, suggested a check for the 'comment' match to
ensure the local environment will properly support fwknopd operations.
The result is the new ENABLE_IPT_COMMENT_CHECK functionality.
Fernando Arnaboldi (IOActive)
- Found important buffer overflow conditions for authenticated SPA clients
in the fwknopd server (pre-2.0.3). These findings enabled fixes to be
developed along with a new fuzzing capability in the test suite.
- Found a condition in which an overly long IP from malicious authenticated
clients is not properly validated by the fwknopd server (pre-2.0.3).
- Found a local buffer overflow in --last processing with a maliciously
constructed ~/.fwknop.run file. This has been fixed with proper
validation of .fwknop.run arguments.
- Found several conditions in which the server did not properly throw out
maliciously constructed variables in the access.conf file. This has been
fixed along with new fuzzing tests in the test suite.
Vlad Glagolev
- Submitted a patch to fix ndbm/gdbm usage when --disable-file-cache is
used for the autoconf configure script. This functionality was broken in
be4193d734850fe60f14a26b547525ea0b9ce1e9 through improper handling of
#define macros from --disable-file-cache.
- Submitted a patch to fix command exec mode under SPA message type
validity test. Support for command exec mode was also added to the test
suite.
- Submitted an OpenBSD port for fwknop-2.0.3, and this has been checked in
under extras/openbsd/.
- Added client timeouts for open/close command cycles for fwknop-2.6.8.
Sean Greven
- Created a port of fwknop for FreeBSD:
http://portsmon.freebsd.org/portoverview.py?category=security&portname=fwknop
Michael T. Dean
- Reported the Rijndael key truncation issue for user-supplied keys
(passphrases) greater than 16 bytes long.
George Herlin
- Proposed a verification approach to test suite operations, and the result
was implemented in a61939c005e2b09d6800e2171f607c9d1948f022. This makes
test suite operate equivalently regardless of whether valgrind is used or
whether fwknop is being tested on an embedded system with very limited
resources.
Ruhsam Bernhard
- Reported an issue where the message size test would result in long
command mode SPA packets not decrypting properly because only GPG decrypt
attempts were made. This issue was fixed in
7e784df3870373f055a2f0f8d818829501bcb1c0.
Shawn Wilson
- Added better SPA source IP logging for various fwknopd logging messages.
This helps to make it more clear why certain SPA packets are rejected
from some systems.
Dan Lauber
- Suggested a check for fwknopd to ensure that the jump rule on systems
running iptables is not duplicated if it already exists.
Ryman
- Reported a timing attack bug in the HMAC comparison operation (#85) and
suggested a fix derived from yaSSL:
http://www.mail-archive.com/debian-bugs-rc@lists.debian.org/msg320402.html
Blair Zajac
- MacPorts fwknop package maintainer for Mac OS X systems.
- Contributed patches to handle endian issues on PPC systems.
- Reported an issue where strndup() is not available on some PPC systems
and the fix is to use the local lib/fko_util.c implementation similarly
to Windows builds.
- Suggested throwing an error in '-M legacy' mode to warn users about the
inability of older fwknopd daemons to handle Rijndael keys > 16 bytes.
Any release after and including 2.5 does not have this limitation.
Radostan Riedel
- Contributed an AppArmor policy that is known to work on Debian and Ubuntu
systems. The policy file is available in extras/apparmor.
Les Aker
- Reported an issue with Arch Linux that resulted in fwknopd hanging for a
pcap_dispatch() packet count of zero when using libpcap-1.5.1. This
issue was tracked on github as issue #110, and the default packet count
is now set at 100 as a result.
Marek Wrzosek
- Suggested doc update to fwknop man pages to accurately describe the usage
of digits instead of bytes for SPA random data. About 53 bits of entropy
are actually used, although this is in addition to the 64-bit random salt
in for key derivation used by PBKDF1 in Rjindael CBC mode.
- Various excellent feedback on crypto design, including the need to remove
the GPG_IGNORE_SIG_VERIFY_ERROR mode.
Gerry Reno
- Updated the Android client to be compatible with Android-4.4.
- Provided guidance on Android client issues along with testing candidate
patches to update various things - this work is being tracked in the
android4.4_support branch.
- Implemented support for firewalld in the fwknopd daemon running on RHEL 7
and CentOS 7 systems. This is a major addition to handle yet another
firewall architecture.
Tim Heckman
- Homebrew fwknop package maintainer for Mac OS X systems.
- Suggested that fwknop support nftables when it is integrated into the
mainline Linux kernel.
Barry Allard
- Reported bug in PF support on FreeBSD systems where ALTQ is not available
would cause new PF rules to not be added (github issue #121).
- Suggested the abiliy to specify the HTTP User-Agent when wget is used to
resolve the external IP via SSL (github issue #134).
Bill Stubbs
- Submitted a patch to fix a bug where fwknopd could not handle Ethernet
frames that include the Frame Check Sequence (FCS) header. This header is
four bytes long, and is placed at the end of each Ethernet frame.
Normally the FCS header is not visible to libpcap, but some card/driver
combinations result in it being included. Bill noticed this on the
following platform:
BeagleBone Black rev C running 3.8.13-bone50 #1 SMP Tue May 13
13:24:52 UTC 2014 armv7l GNU/Linux
Grant Pannell
- Submitted a patch to add a new access.conf variable "DESTINATION" in
order to define the destination address for which an SPA packet will be
accepted. The string "ANY" is also accepted if a valid SPA packet should
be honored to any destination IP. Similarly to the "SOURCE" variable,
networks should be specified in CIDR notation (e.g. "192.168.10.0/24"),
and individual IP addresses can be specified as well. Also, multiple IP's
and/or networks can be defined as a comma separated list (e.g.
"192.168.10.0/24,10.1.1.123").
Alexander Kozhevnikov
- Reported a bug when fwknop is compiled with --enable-udp-server where
the server was including pcap.h
Dan Brooks
- Contributed a patch for the Android client app to add the definition of
custom server udp port. This is similar to the --server-port argument
offered by the main fwknop client.
Github user 'sgh7':
- Contributed a patch to have fwknopd exit if the interface it is sniffing
on goes down. If this happens, it is expected that the native process
monitoring feature in things like systemd or upstart will restart
fwknopd.
Jérémie Courrèges-Anglas and Ingo Feinerer
- Contributed a patch to fix endian detection on OpenBSD systems based on
information contained here:
https://www.opengroup.org/austin/docs/austin_514.txt
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