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GVPE NEWS |
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TODO: bridge mode, finally? |
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TODO: gcm mode? |
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TODO: replace ripemd160 as the only authentication hash. |
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TODO: increase rsa size. |
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TODO: replace transport bits by transport endpoint structs? |
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TODO: ecdh to avoid session replay attacks |
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TODO: http://incog-izick.blogspot.de/2011/08/using-openssl-aes-gcm.html |
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TODO: http://stackoverflow.com/questions/12153009/openssl-c-example-of-aes-gcm-using-evp-interfaces |
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|
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proposed: 3 types, req, resreq, res |
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|
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req (hmac1) rsa(seqno1 hmac1 aes1 seqno2 hmac2 aes2 auth) ecdh1 |
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res (hmac1) hash(rsa-contents) ecdh2 |
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|
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req hmac0(*) rsa(seqno hmac0 hmac aes auth) hkdf-salt ecdh1 |
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res hmac0(rsa-contents ecdh2) |
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hmac_key = hkdf(hkdf-salt, hmac | ecdh) |
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aes_key = hkdf(hkdf-salt, aes | ecdh) |
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|
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TODO: protocol magic fixen(!!!) |
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TODO: "global" |
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TODO: verify |
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TODO: make sense of overhead calculation |
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TODO: if-up &c should not be scripts? |
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- INCOMPATIBLE CHANGE: core protocol version 1.0. |
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- INCOMPATIBLE CHANGE: node sextions are now introduced |
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with "node nodename", not "node = nodename". |
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- while individual packets couldn't be replayed, a whole session |
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could be replayed - this has been fixed by an extra key exchange. |
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- in addition to rsa key exchange and authentication, the handshake now |
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adds a diffie-hellman key exchange (using curve25119) for perfect |
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forward secrecy. mac and cipher keys are derived using HKDF. |
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- rsa key sizes are now configurable and larger (default is 3072). |
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correspondingly, the minimum mtu is no longer 296 but 576. |
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- fixed a potential (unverified) buffer overrun on rsa decryption. |
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- gvpectrl no longer generates all missing public keys, but |
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only missing private keys. private keys are also put |
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into the configured location. |
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- the pid-file now accepts %s as nodename as elsewhere. |
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- no longer use RAND_bytes to generate session keys - you NEED |
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a real source of entropy now (e.g. egd or /dev/random - see the |
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openssl documentation). |
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- multiple node statements for the same node are now supported |
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and will be merged. |
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- a new directive "global" switches back to the global section |
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of the config file. |
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- 12 random prefix bytes are now properly supported, leading to |
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a fully random IV. |
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- use aes with a random key in counter-mode to generate IVs, |
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for speed reasons (generating 12 random bytes with openssl can |
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take longer than encrypting and mac'ing a 1.5kb packet, and IVs |
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do not need to be cryptographically strong random numbers |
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(and in fact, shouldn't be)). |
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- if-up scripts can now be specified with absolute paths. |
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- new global option: serial, to detect configuration mismatches. |
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- use HKDF as authentication proof, not HMAC or a plain hash |
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(hint by Ilmari Karonen). |
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|
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2.25 Sat Jul 13 06:42:33 CEST 2013 |
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- INCOMPATIBLE CHANGE: no longer enable udp protocol if no other |
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protocols are enabled - this is necessary when you have nodes with |
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completely unknown protocols, to force mediated connection requests. |
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- INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2. |
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- core protocol version 0.1, compatible with older releases. |
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- switch to using RSA_generate_key_ex, which is the badly documented |
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and needlessly more complicated replacement for the RSA_generate_key |
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function which is now deprecated. |
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- support additional hmac hashes: sha256 and sha512, usually truncated. |
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- change public exponent for rsa keys from 65535 to 65537, for |
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efficiency reasons - only affects new keys. |
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- nodes would sometimes declare transport endpoints valid despite |
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the protocol not being configured locally. |
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- new global configuration options: chroot, chuser, chuid, chgid, |
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to chroot to a specified or anonymous new root, and change user id. |
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- new global configuration options seed_device and seed_interval, |
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to configure another device than /dev/urandom for random seeds, |
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and to configure a regular interval to reseed the rng. |
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- prefer inet_aton over gethostbyname, as the latter is not guaranteed |
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to "resolve" literal ip addresses. |
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- configure didn't detect openssl 1.0 because SHA1_version became private |
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(patch by TANIGUCHI Takaki). |
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- fix a bug where nodes would tell the other side that it supports |
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the same protocols as that other side, instead of its own. |
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- add zlib when found, as openssl depends on it in newer versions. |
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- work around append-bugs in uclibc by using an extra seek. |
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- new "include" directive for the config file. |
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- gvpectrl no longer evaluates any "on" directives. |
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- icmp and rawip protocols weren't upgradable to each other. |
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- major, but incremental, dns transport improvements: |
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- do not simply abort in some error cases in the dns transport, |
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but try to recover. |
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- allow lowercase/uppercase aliases for base-n encodings that do |
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not rely on case. |
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- use base26 instead of base22 encoding for dns syn's, and |
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base36 instead of base22 for headers (saves one byte/packet). |
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- back off far quicker in dns tunnel when idling - increases |
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latency on an idle link somewhat, but avoids hundreds of |
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needless packets. |
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- poll more aggressively when idling in dns (poll once per |
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second as opposed to once per 5 seconds). |
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- reduce dns send payload size to allow greater rate of ack |
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messages (should help sack and ipv6). |
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- allow for ip options in rawip/icmp transports, even though gvpe |
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doesn't generate them. |
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- upgrade to autoconf 2.69, automake 1.11. |
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- upgrade to libev 4 API. |
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- replace COPYING file by actual GPLv3 - files were relicensed to GPLv3 |
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earlier but COPYING was forgotten. |
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|
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2.24 Sat Feb 12 05:15:48 CET 2011 |
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- protocol version 0.1, compatible with older releases. |
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- due to a bug, when packets were lost, a connection could go into a |
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state where a ping/connection request from another node would be |
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ignored, leading to connections not being re-established. |
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- due to a bug, compression was almost always enabled. |
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- enable-max-mtu was actually enable-mtu, contrary to documentation. |
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- add nfmark support. |
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- add node-change script support. |
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- new DESTSI variable for node-xxx scripts. |
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- updated codingstyle a bit, declared truly static stuff as static. |
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- clarify compression docs. |
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|
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2.22 Sun Feb 1 17:25:28 CET 2009 |
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- protocol version 0.1, compatible with older releases. |
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- enabled icmp/tcp/http-proxy protocols by default. |
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- updated copyright in program greetings. |
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- fix some configure messages. |
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- updated to libev 3.52. |
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|
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2.21 Wed Sep 3 06:56:27 CEST 2008 |
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- protocol version 0.1, compatible with older releases. |
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- add missing ev++.h include header to tarball, which everybody |
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who tested it apparently had in their include path :(. Caught |
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by Karl Kleinpaste and Marcus Kong. |
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|
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2.2 Mon Sep 1 06:28:09 CEST 2008 |
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- protocol version 0.1, compatible with older releases. |
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but upgrade is recommended to due changed ondemand behaviour. |
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- new per-node options max-ttl and max-queue. |
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- convert from iom.C to libev, a high-performance event loop |
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(http://software.schmorp.de/pkg/libev). |
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- tcp connections were leaking in some cases. |
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- retry more aggressively (once/s) to establish a connection if |
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new packets arrive for it. |
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- save a lot of setsockopt calls when the tos doesn't change. |
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- honor disabled even on initial connect attempt. |
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- changed callback mechanism to be slightly less portable |
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but more efficient mechanism (standards-compliant c++ compilers |
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should work). |
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- increased receive window positive size, to allow for massive |
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packet loss due to occasional longer drop-outs. |
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- send RST when a positive window size violation is detected, but |
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not in other cases, to reconnect more quickly. |
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- upgraded liblzf to version 3.4. |
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- dropped -fno-exceptions due to ev++.h using it. |
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- node-up/down scripts are now run in sequence. |
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- new -q switch for gvpectrl, for when you run it often. |
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- work around the horribly inconsistent, ad-hoc, ever-changing |
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and broken texinfo syntax. YMMV. avoid texinfo. |
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- keepalive is more aggressive now, sensding ping's every 3 seconds |
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and killing the conenction after 15 seconds. |
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- bugfixes. |
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|
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2.01 Thu Mar 29 19:26:04 CEST 2007 |
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- protocol version 0.1, compatible with older releases. |
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- bugfix of callback.h, might have cause callback return values to |
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be corrupted on architectures like sparc before. |
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- dns transport retries more aggressively. |
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- updated documentation, improved dns transport reliability |
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and throughput. |
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- added experimental support for sha256 and sha512 digests. |
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|
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2.0 Mon Dec 5 13:59:26 CET 2005 |
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- protocol version 0.1, compatible with older releases. |
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- implement allow-direct, deny-direct node config statements. |
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- implemented != for sockinfo. This fixes a bug where |
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gvpe sent packets to the old ip address of another host |
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even though it had received packets from it's new address. |
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This only causes problems if you forget to -HUP your gvpe after |
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your ip address changed, which is *required*. |
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- sets close-on-exec flag on tcp connections. This fixes a bug |
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where child processes kept tcp connections open and caused |
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connections to fail when only one side can connect. |
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- fixed a bug in receive sequence checking that made gvpe |
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accept out-of-window packets in most cases. |
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- tighter limit for the maximum sequence # to avoid overflow |
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conditions + allow more headroom for packet reordering. |
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- replace some asserts that trapped config mismatches by |
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more useful log messages. |
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- fix spurious extra newline in some log messages. |
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|
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1.9 Tue Apr 19 06:21:50 CEST 2005 |
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- protocol version 0.1, compatible with older releases. |
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- WARNING: this version checks the return value of if-up etc. |
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scripts and exits on failure. |
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- IMPORTANT: run if-up/node-up etc. scripts via /bin/sh. |
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- IMPORTANT: interface initialization (MAC, MTU) is now done |
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automatically in most configurations. |
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- options can now be specified on the gvpe command line, too. |
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- make some DNS transport values configurable and document them. |
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- improved OS specific information in gvpe.osdep(5). |
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- new tap device type "native/darwin", that supports the tap |
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driver available for darwin (thanks to matthew mead who tested |
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it out with me in a long session). tincd/darwin is still available. |
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- new device type "tincd/bsd", which is a newer version of the |
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*bsd-drivers taken from tinc. |
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- fixed a bug in relying on the order of global construction |
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when tcp transport was enabled. The fix makes it use no |
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cpu time unless it is in use, too. |
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- information about other nodes is now available to if-up etc. scripts. |
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- the value of the config variable if-up-data is passed to the if-up |
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etc. scripts. |
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- skip unparsable config lines with a warning instead of stopping |
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parsing and continuing with a certainly unusable config. |
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|
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1.8 Fri Mar 18 00:58:55 CET 2005 |
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- protocol version 0.1, compatible with older releases. |
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- enable-udp = yes is now default only when no other protocols |
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are enabled. otherwise it is disabled unless explicitly enabled. |
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- implemented dns tunneling (experimental now and in the future). |
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- remove support for pre-release version protocol. |
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- updated tincd drivers (rev 1433), added uml_socket driver, documented |
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tincd drivers a bit better. |
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- document icmp configuration values. |
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- document transport protocols in gvpe.protocol(7). |
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- remove unused ChangeLog file. |
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- created a mailinglist at gvpe@lists.schmorp.de. |
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- added an exemption to allow distribution of binaries linked against |
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OpenSSL, as suggested by Guus Sliepen (author of tinc). No |
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GNUTLS conversion in sight. |
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- some portability fixes with respect to --disable-nls. |
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|
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1.7 Tue Feb 22 23:58:59 CET 2005 |
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- protocol version 0.1, compatible with older releases. |
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- first gnu release. |
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- documented the special value 1 for router-priority. |
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- renamed vped => gvpe and vpectrl => gvpectrl, as well as |
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vped.conf => gvpe.conf. |
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- new per-node option "max-retry". |
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- asymmetric rekeying behaviour, so hosts don't rekey simultaneously. |
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- new configure option --enable-static-daemon. |
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- fix configure --help output. |
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- many documentation layout fixes. |
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- synced iom.[Ch] from rxvt-unicode. |
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- try to cope with some non-monotonic time changes. |
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- revert to locale.h - a usual, clocale is nonfunctioning on macosx. |
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- considerably improved pod2texi and the resulting texi doc. |
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|
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1.6.1 Wed May 12 14:48:20 CEST 2004 |
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- protocol version 0.1, compatible with older releases. |
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- fix -c switch that has been broken due to a last-minute fix |
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to option and config file parsing. |
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|
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1.6 Mon May 10 20:55:10 CEST 2004 |
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- protocol version 0.1, compatible with older releases. |
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- do not RESET on out-of-sequence packets (good for wireless). |
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- various non-security-related bugfixes. |
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- c++ify (at least make it compile with g++-3.4, which should make |
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it a little bit more standard c++). |
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|
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1.5 Fri Jan 30 00:50:04 CET 2004 |
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- protocol version 0.1, compatible with older releases. |
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- vped will refuse to start when hostkey and public key do not match. |
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- updated lzf code to version 1.2. |
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- better error reporting for "unusual" conditions, like failing |
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to allocate memory, that should not normally happen and |
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will otherwise result in spurious other error messages. Also |
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adds paranoid checks in case openssl's API changes in a bad way. |
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- fix a bug where queued vpn packets were cleared to zero. while |
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this doesn't affect security, it did cause warning messages and |
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unnecessary connectivity delays. |
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|
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1.4 Sat Jan 17 15:49:21 CET 2004 |
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- protocol version 0.1, compatible with older releases. |
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- better retry behaviour on key mismatch. |
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- use select-based io_manager instead of poll-based one. |
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- share io manager between rxvt-unicode and vpe. |
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- sooo many *BSD workarounds because no BSD I could find is even |
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remotely POSIX-compatible. |
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|
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1.2 Fri Oct 17 03:44:44 CEST 2003 |
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- protocol version 0.1. |
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- tincd kernel interface code imported, more supported platforms |
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(native/linux (2.4), tincd/linux (2.2 and 2.4), tincd/freebsd, |
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native/cygwin). |
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- added primitive ethernet emulation (ipv4 only), which allows |
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the following platforms that only have tun drivers to work: |
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/* none yet tested */ |
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- portability workarounds, especially for unfriendly freebsd |
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- very minor bugfixes |
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- warnings when choosing insecure ciphers/hashes |
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- reduced default hmac length to 8. |
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- cvs now contains configure, Makefile.in and other generated files. |
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- added doc/complex-example to the distribution. |
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|
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1.0 distant past |
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- protocol version 0.1. |
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- tweaked various timeouts to help very slow (486) class |
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machines or nets with many hosts. |
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- tweaked rate-limiting to be more forgiving for hosts |
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connecting through routers (not a fix). |
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|
