| 1 |
GVPE NEWS |
| 2 |
|
| 3 |
TODO: bridge mode, finally? |
| 4 |
TODO: gcm mode? |
| 5 |
TODO: replace ripemd160 as the only authentication hash. |
| 6 |
TODO: increase rsa size. |
| 7 |
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 |
TODO: protocol magic fixen(!!!) |
| 23 |
TODO: "global" |
| 24 |
TODO: verify |
| 25 |
TODO: make sense of overhead calculation |
| 26 |
TODO: if-up &c should not be scripts? |
| 27 |
- INCOMPATIBLE CHANGE: core protocol version 1.0. |
| 28 |
- INCOMPATIBLE CHANGE: node sextions are now introduced |
| 29 |
with "node nodename", not "node = nodename". |
| 30 |
- 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 |
- router reconnects could cause excessive rekeying on other connections. |
| 39 |
- gvpectrl no longer generates all missing public keys, but |
| 40 |
only missing private keys. private keys are also put |
| 41 |
into the configured location. |
| 42 |
- the pid-file now accepts %s as nodename as elsewhere. |
| 43 |
- no longer use RAND_bytes to generate session keys - you NEED |
| 44 |
a real source of entropy now (e.g. egd or /dev/random - see the |
| 45 |
openssl documentation). |
| 46 |
- multiple node statements for the same node are now supported |
| 47 |
and will be merged. |
| 48 |
- a new directive "global" switches back to the global section |
| 49 |
of the config file. |
| 50 |
- 12 random prefix bytes are now properly supported, leading to |
| 51 |
a fully random IV. |
| 52 |
- use aes with a random key in counter-mode to generate IVs, |
| 53 |
for speed reasons (generating 12 random bytes with openssl can |
| 54 |
take longer than encrypting and mac'ing a 1.5kb packet, and IVs |
| 55 |
do not need to be cryptographically strong random numbers |
| 56 |
(and in fact, shouldn't be)). |
| 57 |
- if-up scripts can now be specified with absolute paths. |
| 58 |
- new global option: serial, to detect configuration mismatches. |
| 59 |
- use HKDF as authentication proof, not HMAC or a plain hash |
| 60 |
(hint by Ilmari Karonen). |
| 61 |
- during rekeying or conenction establishments, hmac authentication |
| 62 |
errors could occur and reset the connection. Transient hmac |
| 63 |
authentication errors are now being ignored for 3 seconds. |
| 64 |
- log the reason for a conneciton loss. |
| 65 |
|
| 66 |
2.25 Sat Jul 13 06:42:33 CEST 2013 |
| 67 |
- INCOMPATIBLE CHANGE: no longer enable udp protocol if no other |
| 68 |
protocols are enabled - this is necessary when you have nodes with |
| 69 |
completely unknown protocols, to force mediated connection requests. |
| 70 |
- INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2. |
| 71 |
- core protocol version 0.1, compatible with older releases. |
| 72 |
- switch to using RSA_generate_key_ex, which is the badly documented |
| 73 |
and needlessly more complicated replacement for the RSA_generate_key |
| 74 |
function which is now deprecated. |
| 75 |
- support additional hmac hashes: sha256 and sha512, usually truncated. |
| 76 |
- change public exponent for rsa keys from 65535 to 65537, for |
| 77 |
efficiency reasons - only affects new keys. |
| 78 |
- nodes would sometimes declare transport endpoints valid despite |
| 79 |
the protocol not being configured locally. |
| 80 |
- new global configuration options: chroot, chuser, chuid, chgid, |
| 81 |
to chroot to a specified or anonymous new root, and change user id. |
| 82 |
- new global configuration options seed_device and seed_interval, |
| 83 |
to configure another device than /dev/urandom for random seeds, |
| 84 |
and to configure a regular interval to reseed the rng. |
| 85 |
- prefer inet_aton over gethostbyname, as the latter is not guaranteed |
| 86 |
to "resolve" literal ip addresses. |
| 87 |
- configure didn't detect openssl 1.0 because SHA1_version became private |
| 88 |
(patch by TANIGUCHI Takaki). |
| 89 |
- fix a bug where nodes would tell the other side that it supports |
| 90 |
the same protocols as that other side, instead of its own. |
| 91 |
- add zlib when found, as openssl depends on it in newer versions. |
| 92 |
- work around append-bugs in uclibc by using an extra seek. |
| 93 |
- new "include" directive for the config file. |
| 94 |
- gvpectrl no longer evaluates any "on" directives. |
| 95 |
- icmp and rawip protocols weren't upgradable to each other. |
| 96 |
- major, but incremental, dns transport improvements: |
| 97 |
- do not simply abort in some error cases in the dns transport, |
| 98 |
but try to recover. |
| 99 |
- allow lowercase/uppercase aliases for base-n encodings that do |
| 100 |
not rely on case. |
| 101 |
- use base26 instead of base22 encoding for dns syn's, and |
| 102 |
base36 instead of base22 for headers (saves one byte/packet). |
| 103 |
- back off far quicker in dns tunnel when idling - increases |
| 104 |
latency on an idle link somewhat, but avoids hundreds of |
| 105 |
needless packets. |
| 106 |
- poll more aggressively when idling in dns (poll once per |
| 107 |
second as opposed to once per 5 seconds). |
| 108 |
- reduce dns send payload size to allow greater rate of ack |
| 109 |
messages (should help sack and ipv6). |
| 110 |
- allow for ip options in rawip/icmp transports, even though gvpe |
| 111 |
doesn't generate them. |
| 112 |
- upgrade to autoconf 2.69, automake 1.11. |
| 113 |
- upgrade to libev 4 API. |
| 114 |
- replace COPYING file by actual GPLv3 - files were relicensed to GPLv3 |
| 115 |
earlier but COPYING was forgotten. |
| 116 |
|
| 117 |
2.24 Sat Feb 12 05:15:48 CET 2011 |
| 118 |
- protocol version 0.1, compatible with older releases. |
| 119 |
- due to a bug, when packets were lost, a connection could go into a |
| 120 |
state where a ping/connection request from another node would be |
| 121 |
ignored, leading to connections not being re-established. |
| 122 |
- due to a bug, compression was almost always enabled. |
| 123 |
- enable-max-mtu was actually enable-mtu, contrary to documentation. |
| 124 |
- add nfmark support. |
| 125 |
- add node-change script support. |
| 126 |
- new DESTSI variable for node-xxx scripts. |
| 127 |
- updated codingstyle a bit, declared truly static stuff as static. |
| 128 |
- clarify compression docs. |
| 129 |
|
| 130 |
2.22 Sun Feb 1 17:25:28 CET 2009 |
| 131 |
- protocol version 0.1, compatible with older releases. |
| 132 |
- enabled icmp/tcp/http-proxy protocols by default. |
| 133 |
- updated copyright in program greetings. |
| 134 |
- fix some configure messages. |
| 135 |
- updated to libev 3.52. |
| 136 |
|
| 137 |
2.21 Wed Sep 3 06:56:27 CEST 2008 |
| 138 |
- protocol version 0.1, compatible with older releases. |
| 139 |
- add missing ev++.h include header to tarball, which everybody |
| 140 |
who tested it apparently had in their include path :(. Caught |
| 141 |
by Karl Kleinpaste and Marcus Kong. |
| 142 |
|
| 143 |
2.2 Mon Sep 1 06:28:09 CEST 2008 |
| 144 |
- protocol version 0.1, compatible with older releases. |
| 145 |
but upgrade is recommended to due changed ondemand behaviour. |
| 146 |
- new per-node options max-ttl and max-queue. |
| 147 |
- convert from iom.C to libev, a high-performance event loop |
| 148 |
(http://software.schmorp.de/pkg/libev). |
| 149 |
- tcp connections were leaking in some cases. |
| 150 |
- retry more aggressively (once/s) to establish a connection if |
| 151 |
new packets arrive for it. |
| 152 |
- save a lot of setsockopt calls when the tos doesn't change. |
| 153 |
- honor disabled even on initial connect attempt. |
| 154 |
- changed callback mechanism to be slightly less portable |
| 155 |
but more efficient mechanism (standards-compliant c++ compilers |
| 156 |
should work). |
| 157 |
- increased receive window positive size, to allow for massive |
| 158 |
packet loss due to occasional longer drop-outs. |
| 159 |
- send RST when a positive window size violation is detected, but |
| 160 |
not in other cases, to reconnect more quickly. |
| 161 |
- upgraded liblzf to version 3.4. |
| 162 |
- dropped -fno-exceptions due to ev++.h using it. |
| 163 |
- node-up/down scripts are now run in sequence. |
| 164 |
- new -q switch for gvpectrl, for when you run it often. |
| 165 |
- work around the horribly inconsistent, ad-hoc, ever-changing |
| 166 |
and broken texinfo syntax. YMMV. avoid texinfo. |
| 167 |
- keepalive is more aggressive now, sensding ping's every 3 seconds |
| 168 |
and killing the conenction after 15 seconds. |
| 169 |
- bugfixes. |
| 170 |
|
| 171 |
2.01 Thu Mar 29 19:26:04 CEST 2007 |
| 172 |
- protocol version 0.1, compatible with older releases. |
| 173 |
- bugfix of callback.h, might have cause callback return values to |
| 174 |
be corrupted on architectures like sparc before. |
| 175 |
- dns transport retries more aggressively. |
| 176 |
- updated documentation, improved dns transport reliability |
| 177 |
and throughput. |
| 178 |
- added experimental support for sha256 and sha512 digests. |
| 179 |
|
| 180 |
2.0 Mon Dec 5 13:59:26 CET 2005 |
| 181 |
- protocol version 0.1, compatible with older releases. |
| 182 |
- implement allow-direct, deny-direct node config statements. |
| 183 |
- implemented != for sockinfo. This fixes a bug where |
| 184 |
gvpe sent packets to the old ip address of another host |
| 185 |
even though it had received packets from it's new address. |
| 186 |
This only causes problems if you forget to -HUP your gvpe after |
| 187 |
your ip address changed, which is *required*. |
| 188 |
- sets close-on-exec flag on tcp connections. This fixes a bug |
| 189 |
where child processes kept tcp connections open and caused |
| 190 |
connections to fail when only one side can connect. |
| 191 |
- fixed a bug in receive sequence checking that made gvpe |
| 192 |
accept out-of-window packets in most cases. |
| 193 |
- tighter limit for the maximum sequence # to avoid overflow |
| 194 |
conditions + allow more headroom for packet reordering. |
| 195 |
- replace some asserts that trapped config mismatches by |
| 196 |
more useful log messages. |
| 197 |
- fix spurious extra newline in some log messages. |
| 198 |
|
| 199 |
1.9 Tue Apr 19 06:21:50 CEST 2005 |
| 200 |
- protocol version 0.1, compatible with older releases. |
| 201 |
- WARNING: this version checks the return value of if-up etc. |
| 202 |
scripts and exits on failure. |
| 203 |
- IMPORTANT: run if-up/node-up etc. scripts via /bin/sh. |
| 204 |
- IMPORTANT: interface initialization (MAC, MTU) is now done |
| 205 |
automatically in most configurations. |
| 206 |
- options can now be specified on the gvpe command line, too. |
| 207 |
- make some DNS transport values configurable and document them. |
| 208 |
- improved OS specific information in gvpe.osdep(5). |
| 209 |
- new tap device type "native/darwin", that supports the tap |
| 210 |
driver available for darwin (thanks to matthew mead who tested |
| 211 |
it out with me in a long session). tincd/darwin is still available. |
| 212 |
- new device type "tincd/bsd", which is a newer version of the |
| 213 |
*bsd-drivers taken from tinc. |
| 214 |
- fixed a bug in relying on the order of global construction |
| 215 |
when tcp transport was enabled. The fix makes it use no |
| 216 |
cpu time unless it is in use, too. |
| 217 |
- information about other nodes is now available to if-up etc. scripts. |
| 218 |
- the value of the config variable if-up-data is passed to the if-up |
| 219 |
etc. scripts. |
| 220 |
- skip unparsable config lines with a warning instead of stopping |
| 221 |
parsing and continuing with a certainly unusable config. |
| 222 |
|
| 223 |
1.8 Fri Mar 18 00:58:55 CET 2005 |
| 224 |
- protocol version 0.1, compatible with older releases. |
| 225 |
- enable-udp = yes is now default only when no other protocols |
| 226 |
are enabled. otherwise it is disabled unless explicitly enabled. |
| 227 |
- implemented dns tunneling (experimental now and in the future). |
| 228 |
- remove support for pre-release version protocol. |
| 229 |
- updated tincd drivers (rev 1433), added uml_socket driver, documented |
| 230 |
tincd drivers a bit better. |
| 231 |
- document icmp configuration values. |
| 232 |
- document transport protocols in gvpe.protocol(7). |
| 233 |
- remove unused ChangeLog file. |
| 234 |
- created a mailinglist at gvpe@lists.schmorp.de. |
| 235 |
- added an exemption to allow distribution of binaries linked against |
| 236 |
OpenSSL, as suggested by Guus Sliepen (author of tinc). No |
| 237 |
GNUTLS conversion in sight. |
| 238 |
- some portability fixes with respect to --disable-nls. |
| 239 |
|
| 240 |
1.7 Tue Feb 22 23:58:59 CET 2005 |
| 241 |
- protocol version 0.1, compatible with older releases. |
| 242 |
- first gnu release. |
| 243 |
- documented the special value 1 for router-priority. |
| 244 |
- renamed vped => gvpe and vpectrl => gvpectrl, as well as |
| 245 |
vped.conf => gvpe.conf. |
| 246 |
- new per-node option "max-retry". |
| 247 |
- asymmetric rekeying behaviour, so hosts don't rekey simultaneously. |
| 248 |
- new configure option --enable-static-daemon. |
| 249 |
- fix configure --help output. |
| 250 |
- many documentation layout fixes. |
| 251 |
- synced iom.[Ch] from rxvt-unicode. |
| 252 |
- try to cope with some non-monotonic time changes. |
| 253 |
- revert to locale.h - a usual, clocale is nonfunctioning on macosx. |
| 254 |
- considerably improved pod2texi and the resulting texi doc. |
| 255 |
|
| 256 |
1.6.1 Wed May 12 14:48:20 CEST 2004 |
| 257 |
- protocol version 0.1, compatible with older releases. |
| 258 |
- fix -c switch that has been broken due to a last-minute fix |
| 259 |
to option and config file parsing. |
| 260 |
|
| 261 |
1.6 Mon May 10 20:55:10 CEST 2004 |
| 262 |
- protocol version 0.1, compatible with older releases. |
| 263 |
- do not RESET on out-of-sequence packets (good for wireless). |
| 264 |
- various non-security-related bugfixes. |
| 265 |
- c++ify (at least make it compile with g++-3.4, which should make |
| 266 |
it a little bit more standard c++). |
| 267 |
|
| 268 |
1.5 Fri Jan 30 00:50:04 CET 2004 |
| 269 |
- protocol version 0.1, compatible with older releases. |
| 270 |
- vped will refuse to start when hostkey and public key do not match. |
| 271 |
- updated lzf code to version 1.2. |
| 272 |
- better error reporting for "unusual" conditions, like failing |
| 273 |
to allocate memory, that should not normally happen and |
| 274 |
will otherwise result in spurious other error messages. Also |
| 275 |
adds paranoid checks in case openssl's API changes in a bad way. |
| 276 |
- fix a bug where queued vpn packets were cleared to zero. while |
| 277 |
this doesn't affect security, it did cause warning messages and |
| 278 |
unnecessary connectivity delays. |
| 279 |
|
| 280 |
1.4 Sat Jan 17 15:49:21 CET 2004 |
| 281 |
- protocol version 0.1, compatible with older releases. |
| 282 |
- better retry behaviour on key mismatch. |
| 283 |
- use select-based io_manager instead of poll-based one. |
| 284 |
- share io manager between rxvt-unicode and vpe. |
| 285 |
- sooo many *BSD workarounds because no BSD I could find is even |
| 286 |
remotely POSIX-compatible. |
| 287 |
|
| 288 |
1.2 Fri Oct 17 03:44:44 CEST 2003 |
| 289 |
- protocol version 0.1. |
| 290 |
- tincd kernel interface code imported, more supported platforms |
| 291 |
(native/linux (2.4), tincd/linux (2.2 and 2.4), tincd/freebsd, |
| 292 |
native/cygwin). |
| 293 |
- added primitive ethernet emulation (ipv4 only), which allows |
| 294 |
the following platforms that only have tun drivers to work: |
| 295 |
/* none yet tested */ |
| 296 |
- portability workarounds, especially for unfriendly freebsd |
| 297 |
- very minor bugfixes |
| 298 |
- warnings when choosing insecure ciphers/hashes |
| 299 |
- reduced default hmac length to 8. |
| 300 |
- cvs now contains configure, Makefile.in and other generated files. |
| 301 |
- added doc/complex-example to the distribution. |
| 302 |
|
| 303 |
1.0 distant past |
| 304 |
- protocol version 0.1. |
| 305 |
- tweaked various timeouts to help very slow (486) class |
| 306 |
machines or nets with many hosts. |
| 307 |
- tweaked rate-limiting to be more forgiving for hosts |
| 308 |
connecting through routers (not a fix). |
| 309 |
|
