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