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| 2 | |
2 | |
| 3 | TODO: bridge mode, finally? |
3 | TODO: bridge mode, finally? |
| 4 | TODO: gcm mode? |
4 | TODO: gcm mode? |
| 5 | TODO: replace ripemd160 as the only authentication hash. |
5 | TODO: replace ripemd160 as the only authentication hash. |
| 6 | TODO: increase rsa size. |
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 | TODO: ipv6 |
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29 | - INCOMPATIBLE CHANGE: core protocol version 1.0. |
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30 | - INCOMPATIBLE CHANGE: node sextions are now introduced |
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31 | with "node nodename", not "node = nodename". |
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32 | - while individual packets couldn't be replayed, a whole session |
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33 | could be replayed - this has been fixed by an extra key exchange. |
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34 | - in addition to rsa key exchange and authentication, the handshake now |
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35 | adds a diffie-hellman key exchange (using curve25119) for perfect |
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36 | forward secrecy. mac and cipher keys are derived using HKDF. |
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37 | - rsa key sizes are now configurable and larger (default is 3072). |
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38 | correspondingly, the minimum mtu is no longer 296 but 576. |
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39 | - fixed a potential (unverified) buffer overrun on rsa decryption. |
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40 | - new per-node low-power setting that tries to reduce cpu/network usage. |
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41 | - router reconnects could cause excessive rekeying on other connections. |
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42 | - gvpectrl no longer generates all missing public keys, but |
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43 | only missing private keys. private keys are also put |
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44 | into the configured location. |
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45 | - the pid-file now accepts %s as nodename as elsewhere. |
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46 | - no longer use RAND_bytes to generate session keys - you NEED |
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47 | a real source of entropy now (e.g. egd or /dev/random - see the |
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48 | openssl documentation). |
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49 | - multiple node statements for the same node are now supported |
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50 | and will be merged. |
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51 | - a new directive "global" switches back to the global section |
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52 | of the config file. |
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53 | - 12 random prefix bytes are now properly supported, leading to |
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54 | a fully random IV. |
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55 | - use aes with a random key in counter-mode to generate IVs, |
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56 | for speed reasons (generating 12 random bytes with openssl can |
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57 | take longer than encrypting and mac'ing a 1.5kb packet, and IVs |
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58 | do not need to be cryptographically strong random numbers |
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59 | (and in fact, shouldn't be)). |
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60 | - if-up scripts can now be specified with absolute paths. |
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61 | - new global option: serial, to detect configuration mismatches. |
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62 | - use HKDF as authentication proof, not HMAC or a plain hash |
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63 | (hint by Ilmari Karonen). |
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64 | - during rekeying or conenction establishments, hmac authentication |
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65 | errors could occur and reset the connection. Transient hmac |
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66 | authentication errors are now being ignored for 3 seconds. |
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67 | - log the reason for a conneciton loss. |
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68 | - use a (hopefully) constant time memcmp to compare internal secrets. |
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69 | |
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70 | 2.25 Sat Jul 13 06:42:33 CEST 2013 |
| 8 | - INCOMPATIBLE CHANGE: no longer enable udp protocol if no other |
71 | - INCOMPATIBLE CHANGE: no longer enable udp protocol if no other |
| 9 | protocols are enabled - this is necessary when you have nodes with |
72 | protocols are enabled - this is necessary when you have nodes with |
| 10 | completely unknown protocols, to force mediated connection requests. |
73 | completely unknown protocols, to force mediated connection requests. |
| 11 | - INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2. |
74 | - INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2. |
| 12 | - core protocol version 0.1, compatible with older releases. |
75 | - core protocol version 0.1, compatible with older releases. |
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| 20 | the protocol not being configured locally. |
83 | the protocol not being configured locally. |
| 21 | - new global configuration options: chroot, chuser, chuid, chgid, |
84 | - new global configuration options: chroot, chuser, chuid, chgid, |
| 22 | to chroot to a specified or anonymous new root, and change user id. |
85 | to chroot to a specified or anonymous new root, and change user id. |
| 23 | - new global configuration options seed_device and seed_interval, |
86 | - new global configuration options seed_device and seed_interval, |
| 24 | to configure another device than /dev/urandom for random seeds, |
87 | to configure another device than /dev/urandom for random seeds, |
| 25 | and to configure a regular imterval to reseed the rng. |
88 | and to configure a regular interval to reseed the rng. |
| 26 | - prefer inet_aton over gethostbyname, as the latter is not guaranteed |
89 | - prefer inet_aton over gethostbyname, as the latter is not guaranteed |
| 27 | to "resolve" literal ip addresses. |
90 | to "resolve" literal ip addresses. |
| 28 | - configure didn't detect openssl 1.0 because SHA1_version became private |
91 | - configure didn't detect openssl 1.0 because SHA1_version became private |
| 29 | (patch by TANIGUCHI Takaki). |
92 | (patch by TANIGUCHI Takaki). |
| 30 | - fix a bug where nodes would tell the other side that it supports |
93 | - fix a bug where nodes would tell the other side that it supports |
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… | |
| 35 | - gvpectrl no longer evaluates any "on" directives. |
98 | - gvpectrl no longer evaluates any "on" directives. |
| 36 | - icmp and rawip protocols weren't upgradable to each other. |
99 | - icmp and rawip protocols weren't upgradable to each other. |
| 37 | - major, but incremental, dns transport improvements: |
100 | - major, but incremental, dns transport improvements: |
| 38 | - do not simply abort in some error cases in the dns transport, |
101 | - do not simply abort in some error cases in the dns transport, |
| 39 | but try to recover. |
102 | but try to recover. |
| 40 | - allow lowercase/uppercase alises for base-n encodings that do |
103 | - allow lowercase/uppercase aliases for base-n encodings that do |
| 41 | not rely on case. |
104 | not rely on case. |
| 42 | - use base26 instead of base22 encoding for dns syn's, and |
105 | - use base26 instead of base22 encoding for dns syn's, and |
| 43 | base36 instead of base22 for headers (saves one byte/packet). |
106 | base36 instead of base22 for headers (saves one byte/packet). |
| 44 | - back off far quicker in dns tunnel when idling - increases |
107 | - back off far quicker in dns tunnel when idling - increases |
| 45 | latency on an idle link somewhat, but avoids hundreds of |
108 | latency on an idle link somewhat, but avoids hundreds of |
