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Revision: 1.118
Committed: Fri Jul 19 21:01:16 2013 UTC (10 years, 9 months ago) by root
Branch: MAIN
Changes since 1.117: +2 -0 lines
Log Message:
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File Contents

# User Rev Content
1 pcg 1.83 GVPE NEWS
2 pcg 1.57
3 root 1.106 TODO: bridge mode, finally?
4 root 1.112 TODO: gcm mode?
5     TODO: replace ripemd160 as the only authentication hash.
6     TODO: increase rsa size.
7 root 1.114 TODO: replace transport bits by transport endpoint structs?
8     TODO: ecdh to avoid session replay attacks
9     TODO: http://incog-izick.blogspot.de/2011/08/using-openssl-aes-gcm.html
10     TODO: http://stackoverflow.com/questions/12153009/openssl-c-example-of-aes-gcm-using-evp-interfaces
11    
12     proposed: 3 types, req, resreq, res
13    
14     req (hmac1) rsa(seqno1 hmac1 aes1 seqno2 hmac2 aes2 auth) ecdh1
15     res (hmac1) hash(rsa-contents) ecdh2
16    
17     req hmac0(*) rsa(seqno hmac0 hmac aes auth) hkdf-salt ecdh1
18     res hmac0(rsa-contents ecdh2)
19     hmac_key = hkdf(hkdf-salt, hmac | ecdh)
20     aes_key = hkdf(hkdf-salt, aes | ecdh)
21    
22 root 1.116 TODO: protocol magic fixen(!!!)
23     TODO: "global"
24     TODO: verify
25     TODO: make sense of overhead calculation
26 root 1.117 TODO: if-up &c should not be scripts?
27 root 1.114 - INCOMPATIBLE CHANGE: core protocol version 1.0.
28 root 1.116 - INCOMPATIBLE CHANGE: node sextions are now introduced
29     with "node nodename", not "node = nodename".
30 root 1.114 - while individual packets couldn't be replayed, a whole session
31     could be replayed - this has been fixed by an extra key exchange.
32     - in addition to rsa key exchange and authentication, the handshake now
33     adds a diffie-hellman key exchange (using curve25119) for perfect
34     forward secrecy. mac and cipher keys are derived using HKDF.
35     - rsa key sizes are now configurable and larger (default is 3072).
36     correspondingly, the minimum mtu is no longer 296 but 576.
37     - fixed a potential (unverified) buffer overrun on rsa decryption.
38     - gvpectrl no longer generates all missing public keys, but
39     only missing private keys. private keys are also put
40     into the configured location.
41     - the pid-file now accepts %s as nodename as elsewhere.
42 root 1.115 - no longer use RAND_bytes to generate session keys - you NEED
43     a real source of entropy now (e.g. egd or /dev/random - see the
44     openssl documentation).
45 root 1.116 - multiple node statements for the same node are now supported
46     and will be merged.
47     - a new directive "global" switches back to the global section
48     of the config file.
49     - 12 random prefix bytes are now properly supported, leading to
50     a fully random IV.
51     - use aes with a random key in counter-mode to generate IVs,
52     for speed reasons (generating 12 random bytes with openssl can
53     take longer than encrypting and mac'ing a 1.5kb packet, and IVs
54     do not need to be cryptographically strong random numbers
55     (and in fact, shouldn't be)).
56     - if-up scripts can now be specified with absolute paths.
57 root 1.117 - new global option: serial, to detect configuration mismatches.
58 root 1.118 - use HKDF as authentication proof, not HMAC or a plain hash
59     (hint by Ilmari Karonen).
60 root 1.116
61 root 1.114 2.25 Sat Jul 13 06:42:33 CEST 2013
62 root 1.97 - INCOMPATIBLE CHANGE: no longer enable udp protocol if no other
63     protocols are enabled - this is necessary when you have nodes with
64     completely unknown protocols, to force mediated connection requests.
65 root 1.99 - INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2.
66 root 1.112 - core protocol version 0.1, compatible with older releases.
67 root 1.110 - switch to using RSA_generate_key_ex, which is the badly documented
68 root 1.108 and needlessly more complicated replacement for the RSA_generate_key
69     function which is now deprecated.
70 root 1.112 - support additional hmac hashes: sha256 and sha512, usually truncated.
71 root 1.108 - change public exponent for rsa keys from 65535 to 65537, for
72 root 1.110 efficiency reasons - only affects new keys.
73 root 1.105 - nodes would sometimes declare transport endpoints valid despite
74     the protocol not being configured locally.
75 root 1.106 - new global configuration options: chroot, chuser, chuid, chgid,
76     to chroot to a specified or anonymous new root, and change user id.
77 root 1.112 - new global configuration options seed_device and seed_interval,
78     to configure another device than /dev/urandom for random seeds,
79 root 1.116 and to configure a regular interval to reseed the rng.
80 root 1.107 - prefer inet_aton over gethostbyname, as the latter is not guaranteed
81     to "resolve" literal ip addresses.
82 root 1.102 - configure didn't detect openssl 1.0 because SHA1_version became private
83     (patch by TANIGUCHI Takaki).
84 root 1.97 - fix a bug where nodes would tell the other side that it supports
85     the same protocols as that other side, instead of its own.
86 root 1.98 - add zlib when found, as openssl depends on it in newer versions.
87     - work around append-bugs in uclibc by using an extra seek.
88 root 1.99 - new "include" directive for the config file.
89 root 1.100 - gvpectrl no longer evaluates any "on" directives.
90 root 1.102 - icmp and rawip protocols weren't upgradable to each other.
91 root 1.99 - major, but incremental, dns transport improvements:
92     - do not simply abort in some error cases in the dns transport,
93     but try to recover.
94 root 1.116 - allow lowercase/uppercase aliases for base-n encodings that do
95 root 1.99 not rely on case.
96     - use base26 instead of base22 encoding for dns syn's, and
97     base36 instead of base22 for headers (saves one byte/packet).
98     - back off far quicker in dns tunnel when idling - increases
99     latency on an idle link somewhat, but avoids hundreds of
100     needless packets.
101     - poll more aggressively when idling in dns (poll once per
102     second as opposed to once per 5 seconds).
103 root 1.104 - reduce dns send payload size to allow greater rate of ack
104     messages (should help sack and ipv6).
105 root 1.103 - allow for ip options in rawip/icmp transports, even though gvpe
106     doesn't generate them.
107 root 1.113 - upgrade to autoconf 2.69, automake 1.11.
108 root 1.101 - upgrade to libev 4 API.
109 root 1.113 - replace COPYING file by actual GPLv3 - files were relicensed to GPLv3
110     earlier but COPYING was forgotten.
111 root 1.97
112     2.24 Sat Feb 12 05:15:48 CET 2011
113     - protocol version 0.1, compatible with older releases.
114 root 1.95 - due to a bug, when packets were lost, a connection could go into a
115 root 1.94 state where a ping/connection request from another node would be
116 root 1.96 ignored, leading to connections not being re-established.
117 pcg 1.93 - due to a bug, compression was almost always enabled.
118 pcg 1.92 - enable-max-mtu was actually enable-mtu, contrary to documentation.
119 pcg 1.90 - add nfmark support.
120 pcg 1.91 - add node-change script support.
121     - new DESTSI variable for node-xxx scripts.
122 root 1.95 - updated codingstyle a bit, declared truly static stuff as static.
123 root 1.96 - clarify compression docs.
124 pcg 1.90
125 pcg 1.89 2.22 Sun Feb 1 17:25:28 CET 2009
126 root 1.97 - protocol version 0.1, compatible with older releases.
127 pcg 1.86 - enabled icmp/tcp/http-proxy protocols by default.
128 pcg 1.85 - updated copyright in program greetings.
129 pcg 1.86 - fix some configure messages.
130 pcg 1.87 - updated to libev 3.52.
131 pcg 1.85
132 pcg 1.84 2.21 Wed Sep 3 06:56:27 CEST 2008
133 root 1.97 - protocol version 0.1, compatible with older releases.
134 pcg 1.84 - add missing ev++.h include header to tarball, which everybody
135     who tested it apparently had in their include path :(. Caught
136 pcg 1.85 by Karl Kleinpaste and Marcus Kong.
137 pcg 1.84
138 pcg 1.83 2.2 Mon Sep 1 06:28:09 CEST 2008
139 root 1.97 - protocol version 0.1, compatible with older releases.
140 pcg 1.78 but upgrade is recommended to due changed ondemand behaviour.
141     - new per-node options max-ttl and max-queue.
142 pcg 1.72 - convert from iom.C to libev, a high-performance event loop
143 pcg 1.71 (http://software.schmorp.de/pkg/libev).
144 pcg 1.73 - tcp connections were leaking in some cases.
145 pcg 1.78 - retry more aggressively (once/s) to establish a connection if
146     new packets arrive for it.
147 pcg 1.75 - save a lot of setsockopt calls when the tos doesn't change.
148 pcg 1.78 - honor disabled even on initial connect attempt.
149 pcg 1.76 - changed callback mechanism to be slightly less portable
150     but more efficient mechanism (standards-compliant c++ compilers
151     should work).
152 pcg 1.80 - increased receive window positive size, to allow for massive
153     packet loss due to occasional longer drop-outs.
154     - send RST when a positive window size violation is detected, but
155     not in other cases, to reconnect more quickly.
156 pcg 1.83 - upgraded liblzf to version 3.4.
157 pcg 1.77 - dropped -fno-exceptions due to ev++.h using it.
158 pcg 1.81 - node-up/down scripts are now run in sequence.
159     - new -q switch for gvpectrl, for when you run it often.
160 pcg 1.82 - work around the horribly inconsistent, ad-hoc, ever-changing
161     and broken texinfo syntax. YMMV. avoid texinfo.
162 pcg 1.83 - keepalive is more aggressive now, sensding ping's every 3 seconds
163     and killing the conenction after 15 seconds.
164 pcg 1.71 - bugfixes.
165    
166 pcg 1.70 2.01 Thu Mar 29 19:26:04 CEST 2007
167 pcg 1.69 - protocol version 0.1, compatible with older releases.
168 pcg 1.68 - bugfix of callback.h, might have cause callback return values to
169     be corrupted on architectures like sparc before.
170 pcg 1.69 - dns transport retries more aggressively.
171 pcg 1.70 - updated documentation, improved dns transport reliability
172     and throughput.
173     - added experimental support for sha256 and sha512 digests.
174 pcg 1.67
175 pcg 1.66 2.0 Mon Dec 5 13:59:26 CET 2005
176 pcg 1.56 - protocol version 0.1, compatible with older releases.
177 pcg 1.65 - implement allow-direct, deny-direct node config statements.
178 pcg 1.59 - implemented != for sockinfo. This fixes a bug where
179     gvpe sent packets to the old ip address of another host
180     even though it had received packets from it's new address.
181 pcg 1.61 This only causes problems if you forget to -HUP your gvpe after
182 pcg 1.59 your ip address changed, which is *required*.
183 pcg 1.64 - sets close-on-exec flag on tcp connections. This fixes a bug
184     where child processes kept tcp connections open and caused
185     connections to fail when only one side can connect.
186     - fixed a bug in receive sequence checking that made gvpe
187     accept out-of-window packets in most cases.
188 pcg 1.61 - tighter limit for the maximum sequence # to avoid overflow
189     conditions + allow more headroom for packet reordering.
190 pcg 1.66 - replace some asserts that trapped config mismatches by
191 pcg 1.62 more useful log messages.
192 pcg 1.63 - fix spurious extra newline in some log messages.
193 pcg 1.56
194 pcg 1.55 1.9 Tue Apr 19 06:21:50 CEST 2005
195 pcg 1.56 - protocol version 0.1, compatible with older releases.
196 pcg 1.49 - WARNING: this version checks the return value of if-up etc.
197     scripts and exits on failure.
198 pcg 1.50 - IMPORTANT: run if-up/node-up etc. scripts via /bin/sh.
199     - IMPORTANT: interface initialization (MAC, MTU) is now done
200     automatically in most configurations.
201 pcg 1.54 - options can now be specified on the gvpe command line, too.
202 pcg 1.49 - make some DNS transport values configurable and document them.
203     - improved OS specific information in gvpe.osdep(5).
204 pcg 1.51 - new tap device type "native/darwin", that supports the tap
205 pcg 1.45 driver available for darwin (thanks to matthew mead who tested
206 pcg 1.47 it out with me in a long session). tincd/darwin is still available.
207 pcg 1.51 - new device type "tincd/bsd", which is a newer version of the
208     *bsd-drivers taken from tinc.
209 pcg 1.46 - fixed a bug in relying on the order of global construction
210     when tcp transport was enabled. The fix makes it use no
211     cpu time unless it is in use, too.
212 pcg 1.52 - information about other nodes is now available to if-up etc. scripts.
213     - the value of the config variable if-up-data is passed to the if-up
214     etc. scripts.
215 pcg 1.49 - skip unparsable config lines with a warning instead of stopping
216     parsing and continuing with a certainly unusable config.
217 pcg 1.43
218 pcg 1.41 1.8 Fri Mar 18 00:58:55 CET 2005
219 pcg 1.56 - protocol version 0.1, compatible with older releases.
220 pcg 1.36 - enable-udp = yes is now default only when no other protocols
221     are enabled. otherwise it is disabled unless explicitly enabled.
222 pcg 1.40 - implemented dns tunneling (experimental now and in the future).
223 pcg 1.39 - remove support for pre-release version protocol.
224 pcg 1.41 - updated tincd drivers (rev 1433), added uml_socket driver, documented
225     tincd drivers a bit better.
226 pcg 1.40 - document icmp configuration values.
227     - document transport protocols in gvpe.protocol(7).
228     - remove unused ChangeLog file.
229 pcg 1.41 - created a mailinglist at gvpe@lists.schmorp.de.
230     - added an exemption to allow distribution of binaries linked against
231     OpenSSL, as suggested by Guus Sliepen (author of tinc). No
232     GNUTLS conversion in sight.
233 pcg 1.42 - some portability fixes with respect to --disable-nls.
234 pcg 1.36
235 pcg 1.35 1.7 Tue Feb 22 23:58:59 CET 2005
236 pcg 1.32 - protocol version 0.1, compatible with older releases.
237 pcg 1.26 - first gnu release.
238 pcg 1.27 - documented the special value 1 for router-priority.
239 pcg 1.26 - renamed vped => gvpe and vpectrl => gvpectrl, as well as
240     vped.conf => gvpe.conf.
241 pcg 1.29 - new per-node option "max-retry".
242 pcg 1.22 - asymmetric rekeying behaviour, so hosts don't rekey simultaneously.
243 pcg 1.24 - new configure option --enable-static-daemon.
244 pcg 1.23 - fix configure --help output.
245 pcg 1.26 - many documentation layout fixes.
246 pcg 1.28 - synced iom.[Ch] from rxvt-unicode.
247 pcg 1.34 - try to cope with some non-monotonic time changes.
248 pcg 1.30 - revert to locale.h - a usual, clocale is nonfunctioning on macosx.
249 pcg 1.32 - considerably improved pod2texi and the resulting texi doc.
250 pcg 1.22
251 pcg 1.21 1.6.1 Wed May 12 14:48:20 CEST 2004
252 pcg 1.32 - protocol version 0.1, compatible with older releases.
253 pcg 1.22 - fix -c switch that has been broken due to a last-minute fix
254     to option and config file parsing.
255 pcg 1.21
256 pcg 1.20 1.6 Mon May 10 20:55:10 CEST 2004
257 pcg 1.22 - protocol version 0.1, compatible with older releases.
258     - do not RESET on out-of-sequence packets (good for wireless).
259     - various non-security-related bugfixes.
260     - c++ify (at least make it compile with g++-3.4, which should make
261     it a little bit more standard c++).
262 pcg 1.19
263 pcg 1.18 1.5 Fri Jan 30 00:50:04 CET 2004
264 pcg 1.22 - protocol version 0.1, compatible with older releases.
265     - vped will refuse to start when hostkey and public key do not match.
266     - updated lzf code to version 1.2.
267     - better error reporting for "unusual" conditions, like failing
268     to allocate memory, that should not normally happen and
269     will otherwise result in spurious other error messages. Also
270     adds paranoid checks in case openssl's API changes in a bad way.
271     - fix a bug where queued vpn packets were cleared to zero. while
272     this doesn't affect security, it did cause warning messages and
273     unnecessary connectivity delays.
274 pcg 1.15
275 pcg 1.13 1.4 Sat Jan 17 15:49:21 CET 2004
276 pcg 1.22 - protocol version 0.1, compatible with older releases.
277     - better retry behaviour on key mismatch.
278     - use select-based io_manager instead of poll-based one.
279     - share io manager between rxvt-unicode and vpe.
280     - sooo many *BSD workarounds because no BSD I could find is even
281     remotely POSIX-compatible.
282 pcg 1.11
283 pcg 1.10 1.2 Fri Oct 17 03:44:44 CEST 2003
284 pcg 1.22 - protocol version 0.1.
285     - tincd kernel interface code imported, more supported platforms
286     (native/linux (2.4), tincd/linux (2.2 and 2.4), tincd/freebsd,
287     native/cygwin).
288     - added primitive ethernet emulation (ipv4 only), which allows
289     the following platforms that only have tun drivers to work:
290     /* none yet tested */
291     - portability workarounds, especially for unfriendly freebsd
292     - very minor bugfixes
293     - warnings when choosing insecure ciphers/hashes
294     - reduced default hmac length to 8.
295     - cvs now contains configure, Makefile.in and other generated files.
296     - added doc/complex-example to the distribution.
297    
298     1.0 distant past
299     - protocol version 0.1.
300     - tweaked various timeouts to help very slow (486) class
301     machines or nets with many hosts.
302     - tweaked rate-limiting to be more forgiving for hosts
303     connecting through routers (not a fix).
304 pcg 1.2