| 1 | 2.0 |
1 | GVPE NEWS |
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2 | |
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3 | TODO: bridge mode, finally? |
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4 | TODO: gcm mode? |
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5 | TODO: replace ripemd160 as the only authentication hash. |
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6 | TODO: increase rsa size. |
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7 | TODO: replace transport bits by transport endpoint structs? |
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8 | TODO: ecdh to avoid session replay attacks |
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9 | TODO: http://incog-izick.blogspot.de/2011/08/using-openssl-aes-gcm.html |
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10 | TODO: http://stackoverflow.com/questions/12153009/openssl-c-example-of-aes-gcm-using-evp-interfaces |
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11 | |
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12 | proposed: 3 types, req, resreq, res |
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13 | |
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14 | req (hmac1) rsa(seqno1 hmac1 aes1 seqno2 hmac2 aes2 auth) ecdh1 |
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15 | res (hmac1) hash(rsa-contents) ecdh2 |
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16 | |
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17 | req hmac0(*) rsa(seqno hmac0 hmac aes auth) hkdf-salt ecdh1 |
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18 | res hmac0(rsa-contents ecdh2) |
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19 | hmac_key = hkdf(hkdf-salt, hmac | ecdh) |
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20 | aes_key = hkdf(hkdf-salt, aes | ecdh) |
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21 | |
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22 | TODO: protocol magic fixen(!!!) |
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23 | TODO: "global" |
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24 | TODO: verify |
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25 | TODO: make sense of overhead calculation |
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26 | TODO: if-up &c should not be scripts? |
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27 | TODO: low-power |
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28 | - INCOMPATIBLE CHANGE: core protocol version 1.0. |
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29 | - INCOMPATIBLE CHANGE: node sextions are now introduced |
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30 | with "node nodename", not "node = nodename". |
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31 | - while individual packets couldn't be replayed, a whole session |
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32 | could be replayed - this has been fixed by an extra key exchange. |
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33 | - in addition to rsa key exchange and authentication, the handshake now |
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34 | adds a diffie-hellman key exchange (using curve25119) for perfect |
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35 | forward secrecy. mac and cipher keys are derived using HKDF. |
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36 | - rsa key sizes are now configurable and larger (default is 3072). |
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37 | correspondingly, the minimum mtu is no longer 296 but 576. |
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38 | - fixed a potential (unverified) buffer overrun on rsa decryption. |
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39 | - new per-node low-power setting that tries to reduce cpu/network usage. |
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40 | - router reconnects could cause excessive rekeying on other connections. |
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41 | - gvpectrl no longer generates all missing public keys, but |
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42 | only missing private keys. private keys are also put |
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43 | into the configured location. |
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44 | - the pid-file now accepts %s as nodename as elsewhere. |
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45 | - no longer use RAND_bytes to generate session keys - you NEED |
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46 | a real source of entropy now (e.g. egd or /dev/random - see the |
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47 | openssl documentation). |
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48 | - multiple node statements for the same node are now supported |
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49 | and will be merged. |
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50 | - a new directive "global" switches back to the global section |
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51 | of the config file. |
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52 | - 12 random prefix bytes are now properly supported, leading to |
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53 | a fully random IV. |
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54 | - use aes with a random key in counter-mode to generate IVs, |
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55 | for speed reasons (generating 12 random bytes with openssl can |
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56 | take longer than encrypting and mac'ing a 1.5kb packet, and IVs |
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57 | do not need to be cryptographically strong random numbers |
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58 | (and in fact, shouldn't be)). |
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59 | - if-up scripts can now be specified with absolute paths. |
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60 | - new global option: serial, to detect configuration mismatches. |
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61 | - use HKDF as authentication proof, not HMAC or a plain hash |
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62 | (hint by Ilmari Karonen). |
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63 | - during rekeying or conenction establishments, hmac authentication |
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64 | errors could occur and reset the connection. Transient hmac |
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65 | authentication errors are now being ignored for 3 seconds. |
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66 | - log the reason for a conneciton loss. |
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67 | |
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68 | 2.25 Sat Jul 13 06:42:33 CEST 2013 |
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69 | - INCOMPATIBLE CHANGE: no longer enable udp protocol if no other |
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70 | protocols are enabled - this is necessary when you have nodes with |
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71 | completely unknown protocols, to force mediated connection requests. |
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72 | - INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2. |
| 2 | - protocol version 0.1, compatible with older releases. |
73 | - core protocol version 0.1, compatible with older releases. |
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74 | - switch to using RSA_generate_key_ex, which is the badly documented |
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75 | and needlessly more complicated replacement for the RSA_generate_key |
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76 | function which is now deprecated. |
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77 | - support additional hmac hashes: sha256 and sha512, usually truncated. |
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78 | - change public exponent for rsa keys from 65535 to 65537, for |
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79 | efficiency reasons - only affects new keys. |
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80 | - nodes would sometimes declare transport endpoints valid despite |
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81 | the protocol not being configured locally. |
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82 | - new global configuration options: chroot, chuser, chuid, chgid, |
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83 | to chroot to a specified or anonymous new root, and change user id. |
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84 | - new global configuration options seed_device and seed_interval, |
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85 | to configure another device than /dev/urandom for random seeds, |
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86 | and to configure a regular interval to reseed the rng. |
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87 | - prefer inet_aton over gethostbyname, as the latter is not guaranteed |
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88 | to "resolve" literal ip addresses. |
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89 | - configure didn't detect openssl 1.0 because SHA1_version became private |
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90 | (patch by TANIGUCHI Takaki). |
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91 | - fix a bug where nodes would tell the other side that it supports |
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92 | the same protocols as that other side, instead of its own. |
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93 | - add zlib when found, as openssl depends on it in newer versions. |
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94 | - work around append-bugs in uclibc by using an extra seek. |
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95 | - new "include" directive for the config file. |
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96 | - gvpectrl no longer evaluates any "on" directives. |
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97 | - icmp and rawip protocols weren't upgradable to each other. |
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98 | - major, but incremental, dns transport improvements: |
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99 | - do not simply abort in some error cases in the dns transport, |
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100 | but try to recover. |
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101 | - allow lowercase/uppercase aliases for base-n encodings that do |
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102 | not rely on case. |
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103 | - use base26 instead of base22 encoding for dns syn's, and |
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104 | base36 instead of base22 for headers (saves one byte/packet). |
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105 | - back off far quicker in dns tunnel when idling - increases |
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106 | latency on an idle link somewhat, but avoids hundreds of |
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107 | needless packets. |
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108 | - poll more aggressively when idling in dns (poll once per |
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109 | second as opposed to once per 5 seconds). |
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110 | - reduce dns send payload size to allow greater rate of ack |
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111 | messages (should help sack and ipv6). |
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112 | - allow for ip options in rawip/icmp transports, even though gvpe |
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113 | doesn't generate them. |
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114 | - upgrade to autoconf 2.69, automake 1.11. |
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115 | - upgrade to libev 4 API. |
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116 | - replace COPYING file by actual GPLv3 - files were relicensed to GPLv3 |
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117 | earlier but COPYING was forgotten. |
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118 | |
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119 | 2.24 Sat Feb 12 05:15:48 CET 2011 |
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120 | - protocol version 0.1, compatible with older releases. |
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121 | - due to a bug, when packets were lost, a connection could go into a |
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122 | state where a ping/connection request from another node would be |
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123 | ignored, leading to connections not being re-established. |
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124 | - due to a bug, compression was almost always enabled. |
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125 | - enable-max-mtu was actually enable-mtu, contrary to documentation. |
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126 | - add nfmark support. |
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127 | - add node-change script support. |
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128 | - new DESTSI variable for node-xxx scripts. |
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129 | - updated codingstyle a bit, declared truly static stuff as static. |
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130 | - clarify compression docs. |
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131 | |
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132 | 2.22 Sun Feb 1 17:25:28 CET 2009 |
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133 | - protocol version 0.1, compatible with older releases. |
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134 | - enabled icmp/tcp/http-proxy protocols by default. |
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135 | - updated copyright in program greetings. |
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136 | - fix some configure messages. |
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137 | - updated to libev 3.52. |
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138 | |
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139 | 2.21 Wed Sep 3 06:56:27 CEST 2008 |
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140 | - protocol version 0.1, compatible with older releases. |
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141 | - add missing ev++.h include header to tarball, which everybody |
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142 | who tested it apparently had in their include path :(. Caught |
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143 | by Karl Kleinpaste and Marcus Kong. |
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144 | |
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145 | 2.2 Mon Sep 1 06:28:09 CEST 2008 |
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146 | - protocol version 0.1, compatible with older releases. |
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147 | but upgrade is recommended to due changed ondemand behaviour. |
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148 | - new per-node options max-ttl and max-queue. |
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149 | - convert from iom.C to libev, a high-performance event loop |
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150 | (http://software.schmorp.de/pkg/libev). |
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151 | - tcp connections were leaking in some cases. |
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152 | - retry more aggressively (once/s) to establish a connection if |
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153 | new packets arrive for it. |
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154 | - save a lot of setsockopt calls when the tos doesn't change. |
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155 | - honor disabled even on initial connect attempt. |
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156 | - changed callback mechanism to be slightly less portable |
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157 | but more efficient mechanism (standards-compliant c++ compilers |
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158 | should work). |
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159 | - increased receive window positive size, to allow for massive |
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160 | packet loss due to occasional longer drop-outs. |
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161 | - send RST when a positive window size violation is detected, but |
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162 | not in other cases, to reconnect more quickly. |
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163 | - upgraded liblzf to version 3.4. |
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164 | - dropped -fno-exceptions due to ev++.h using it. |
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165 | - node-up/down scripts are now run in sequence. |
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166 | - new -q switch for gvpectrl, for when you run it often. |
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167 | - work around the horribly inconsistent, ad-hoc, ever-changing |
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168 | and broken texinfo syntax. YMMV. avoid texinfo. |
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169 | - keepalive is more aggressive now, sensding ping's every 3 seconds |
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170 | and killing the conenction after 15 seconds. |
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171 | - bugfixes. |
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172 | |
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173 | 2.01 Thu Mar 29 19:26:04 CEST 2007 |
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174 | - protocol version 0.1, compatible with older releases. |
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175 | - bugfix of callback.h, might have cause callback return values to |
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176 | be corrupted on architectures like sparc before. |
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177 | - dns transport retries more aggressively. |
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178 | - updated documentation, improved dns transport reliability |
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179 | and throughput. |
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180 | - added experimental support for sha256 and sha512 digests. |
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181 | |
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182 | 2.0 Mon Dec 5 13:59:26 CET 2005 |
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183 | - protocol version 0.1, compatible with older releases. |
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184 | - implement allow-direct, deny-direct node config statements. |
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185 | - implemented != for sockinfo. This fixes a bug where |
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186 | gvpe sent packets to the old ip address of another host |
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187 | even though it had received packets from it's new address. |
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188 | This only causes problems if you forget to -HUP your gvpe after |
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189 | your ip address changed, which is *required*. |
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190 | - sets close-on-exec flag on tcp connections. This fixes a bug |
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191 | where child processes kept tcp connections open and caused |
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192 | connections to fail when only one side can connect. |
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193 | - fixed a bug in receive sequence checking that made gvpe |
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194 | accept out-of-window packets in most cases. |
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195 | - tighter limit for the maximum sequence # to avoid overflow |
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196 | conditions + allow more headroom for packet reordering. |
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197 | - replace some asserts that trapped config mismatches by |
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198 | more useful log messages. |
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199 | - fix spurious extra newline in some log messages. |
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200 | |
| 4 | 1.9 Tue Apr 19 06:21:50 CEST 2005 |
201 | 1.9 Tue Apr 19 06:21:50 CEST 2005 |
| 5 | - protocol version 0.1, compatible with older releases. |
202 | - protocol version 0.1, compatible with older releases. |
| 6 | - WARNING: this version checks the return value of if-up etc. |
203 | - WARNING: this version checks the return value of if-up etc. |
| 7 | scripts and exits on failure. |
204 | scripts and exits on failure. |
