1 fwknop-2.0.4 (09/20/2012):
2 - [server] (Vlad Glagolev) Submitted a patch to fix ndbm/gdbm usage when
3 --disable-file-cache is used for the autoconf configure script. This
4 functionality was broken in be4193d734850fe60f14a26b547525ea0b9ce1e9
5 through improper handling of #define macros from --disable-file-cache.
7 fwknop-2.0.3 (09/03/2012):
8 - [server] Fernando Arnaboldi from IOActive found several DoS/code
9 execution vulnerabilities for malicious fwknop clients that manage to
10 get past the authentication stage (so a such a client must be in
11 possession of a valid access.conf encryption key). These vulnerabilities
12 manifested themselves in the handling of malformed access requests, and
13 both the fwknopd server code along with libfko now perform stronger input
14 validation of access request data. These vulnerabilities affect
15 pre-2.0.3 fwknop releases.
16 - [server] Fernando Arnaboldi from IOActive found a condition in which
17 the server did not properly validate allow IP addresses from malicious
18 authenticated clients. This has been fixed with stronger allow IP
20 - [client+server] Fernando Arnaboldi from IOActive found that strict
21 filesystem permissions for various fwknop files are not verified. Added
22 warnings whenever permissions are not strict enough, and ensured that
23 files created by the fwknop client and server are only set to user
25 - [client] Fernando Arnaboldi from IOActive found a local buffer overflow
26 in --last processing with a maliciously constructed ~/.fwknop.run file.
27 This has been fixed with proper validation of .fwknop.run arguments.
28 - [server] Fernando Arnaboldi from IOActive found several conditions in
29 which the server did not properly throw out maliciously constructed
30 variables in the access.conf file. This has been fixed along with new
31 fuzzing tests in the test suite.
32 - [test suite] Added a new fuzzing capability to ensure proper server-side
33 input validation. Fuzzing data is constructed with modified fwknop
34 client code that is designed to emulate malicious behavior.
35 - Fixed RPM builds by including the $(DESTDIR) prefix for uninstall-local
36 and install-exec-hook stages in Makefile.am.
38 fwknop-2.0.2 (08/18/2012):
39 - [server] For GPG mode, added a new access.conf variable
40 "GPG_ALLOW_NO_PW" to make it possible to leverage a server-side GPG key
41 pair that has no associated password. This comes in handy when a system
42 requires the user to leverage gpg-agent / pinentry which can present a
43 problem in automated environments as required by the fwknopd server.
44 Now, it might seem like a problem to remove the passphrase from a GPG
45 key pair, but it's important to note that simply doing this is little
46 worse than storing the passphrase in the clear on disk anyway in the
47 access.conf file. Further, this link helps provide additional detail:
49 http://www.gnupg.org/faq/GnuPG-FAQ.html#how-can-i-use-gnupg-in-an-automated-environment
51 - [client] In IP resolution mode (-R) changed HTTP connection type to
52 'close' since there is no need for connection persistence, and indeed the
53 client expects to just get the IP and the connection to be closed.
54 Jonathan Schulz submitted a patch for this.
55 - [client] Bug fix to ensure that all data is read via recv() from a
56 remote webserver IP resolution mode (-R). Previously IP resolution
57 could fail if HTTP headers were transferred separately from the data
58 (for whatever reason). Jonathan Schulz submitted a patch for this.
59 - [client] Added backup check against a cipherdyne.com 'myip' cgi instance
60 in -R mode if the normal check against cipherdyne.org fails.
61 - [server] Bug fix to implement FLUSH_IPT_AT_INIT and FLUSH_IPT_AT_EXIT
62 functionality. These are enabled by default, and now iptables rules
63 added by fwknopd can be made persistent by setting these variables to
64 "N" in the fwknopd.conf file (this is not a recommended setting
66 [server] Added FLUSH_IPFW_AT_INIT and FLUSH_IPFW_AT_EXIT for ipfw
67 firewalls to emulate the corresponding functionality that is implemented
68 for iptables firewalls. This was suggested by Jonathan Schulz.
69 - [server] Replay attack bug fix to ensure that an attacker cannot force a
70 replay attack by intercepting an SPA packet and the replaying it with the
71 base64 version of "Salted__" (for Rijndael) or the "hQ" prefix (for
72 GnuPG). This is an important fix. The following comment was added into
75 /* Ignore any SPA packets that contain the Rijndael or GnuPG prefixes
76 * since an attacker might have tacked them on to a previously seen
77 * SPA packet in an attempt to get past the replay check. And, we're
78 * no worse off since a legitimate SPA packet that happens to include
79 * a prefix after the outer one is stripped off won't decrypt properly
80 * anyway because libfko would not add a new one.
83 - [server] Fixed a memory leak bug in the replay attack detection code.
84 The leak was found with the test suite in --enable-valgrind mode, and
85 here is the valgrind trace that exposed it:
87 44 bytes in 1 blocks are definitely lost in loss record 2 of 2
88 at 0x482BE68: malloc (in
89 /usr/lib/valgrind/vgpreload_memcheck-x86-linux.so)
90 by 0x490EA50: strdup (strdup.c:43)
91 by 0x10CD69: incoming_spa (incoming_spa.c:162)
92 by 0x10E000: process_packet (process_packet.c:200)
93 by 0x4862E63: ??? (in /usr/lib/i386-linux-gnu/libpcap.so.1.1.1)
94 by 0x4865667: pcap_dispatch (in /usr/lib/i386-linux-gnu/libpcap.so.1.1.1)
95 by 0x10DABF: pcap_capture (pcap_capture.c:226)
96 by 0x10A798: main (fwknopd.c:299)
98 - [test suite] Added GPG tests for keyrings that have no associated
100 - [server] Implemented a new check to ensure that the iptables 'comment'
101 match exists to ensure the proper environment for fwknopd operations.
102 This check is controlled by the new ENABLE_IPT_COMMENT_CHECK variable,
103 and was suggested by Hank Leininger.
104 - [server] 'make install' fix to ensure restrictive permissions on the
105 /etc/fwknop/ directory and /etc/fwknop/* files. Also updated the 'make
106 install' step to not overwrite any existing config files in /etc/fwknop/
107 and instead install new copies from the source tree at
108 /etc/fwknop/fwknopd.conf.inst and /etc/fwknop/access.conf.inst
110 fwknop-2.0.1 (07/23/2012):
111 - [server] Bug fix where the same encryption key used for two stanzas in
112 the access.conf file would result in access requests that matched the
113 second stanza to always be treated as a replay attack. This has been
114 fixed for the fwknop-2.0.1 release, and was reported by Andy Rowland. Now
115 the fwknopd server computes the SHA256 digest of raw incoming payload
116 data before decryption, and compares this against all previous hashes.
117 Previous to this commit, fwknopd would add a new hash to the replay
118 digest list right after the first access.conf stanza match, so when SPA
119 packet data matched the second access.conf stanza a matching replay
120 digest would already be there.
121 - [server] Updated PCAP_LOOP_SLEEP default to 1/10th of a second (in
122 microseconds). This was supposed to be the default anyway, but C
123 Anthony Risinger reported a bug where fwknopd was consuming more
124 resources than necessary, and the cause was PCAP_LOOP_SLEEP set by
125 default to 1/100th of a second - this has been fixed.
126 - [libfko] Added SPA message validation calls to fko decoding routines to
127 help ensure that SPA messages conform to expected values.
128 - Bug fix for PF firewalls: updated the PF anchor check to not rely on
129 listing the PF policy - fwknopd now uses 'pfctl -s Anchor' instead.
130 - [test suite] Added parsing of valgrind output to produce a listing of
131 functions that have been flagged - this assists in the development
132 process to ensure that fwknop is not leaking memory.
133 - [test suite] Bug fix on Mac OS X systems to account for libfko.dylib path
134 instead of libfko.so. This fixes the existence check for libfko.
135 - [test suite] Added tests for --nat-local mode.
136 - [client] Fixed several minor memory leaks caught by valgrind.
137 - [libfko] Minor gcc warning fix: fko_decode.c:43:17: warning: variable
138 'edata_size' set but not used [-Wunused-but-set-variable].
139 - Updated fwknopd init script for Debian systems (contributed by Franck
142 fwknop-2.0 (01/02/2012):
143 - This is the first production release that has been completely re-written
144 in C. This brings Single Packet Authorization functionality to all sorts
145 of machines from embedded devices to large systems. iptables, ipfw, and
146 pf firewalls are supported by the fwknopd daemon, and the fwknop client
147 is known to work on most major *NIX environments, the iPhone and Android
148 operating systems, and Cygwin under Windows.
149 - Added FORCE_NAT mode to the access.conf file so that for any valid SPA
150 packet, force the requested connection to be NAT'd through to the
151 specified (usually internal) IP and port value. This is useful if there
152 are multiple internal systems running a service such as SSHD, and you
153 want to give transparent access to only one internal system for each
154 stanza in the access.conf file. This way, multiple external users can
155 each directly access only one internal system per SPA key.
156 - Added two new access.conf variables are added "ACCESS_EXPIRE" and
157 "ACCESS_EXPIRE_EPOCH" to allow access stanzas to be expired without
158 having to modify the access.conf file and restart fwknopd.
159 - Added a new feature to allow an access stanza that matches the SPA source
160 address to not automatically short circuit other stanzas if there is an
161 error (such as when there are multiple encryption keys involved and an
162 incoming SPA packet is meant for, say, the second stanza and the first
163 therefore doesn't allow proper decryption).
164 - Bug fix to exclude SPA packets with timestamps in the future that are too
165 great (old packets were properly excluded already).
166 - Bug fix to honor the fwknop client --time-offset-plus and
167 --time-offset-minus options
168 - Added DNAT mode tests, minor memory leak fix in NAT mode, added fwknopd
169 check for ENABLE_IPT_FORWARDING variable before attempting NAT access.
170 - [test suite] Added --diff mode to compare results from one execution to