| 1 | GVPE NEWS |
1 | GVPE NEWS |
| 2 | |
2 | |
| 3 | TODO: bridge mode, finally? |
3 | 3.1 |
| 4 | TODO: gcm mode? |
4 | - port to openssl 1.1 BUT SEE WARNING IN configure.ac. Do not use! |
| 5 | TODO: replace ripemd160 as the only authentication hash. |
5 | - tinc cruft tremoval: remove getopt.[ch], it's less portable to |
| 6 | TODO: increase rsa size. |
6 | have it then to not have it. |
| 7 | TODO: replace transport bits by transport endpoint structs? |
7 | - tinc cruft removal: use pkg-config to detect libressl/openssl. |
| 8 | TODO: ecdh to avoid session replay attacks |
8 | - minor cleanups. |
| 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 | |
9 | |
| 12 | proposed: 3 types, req, resreq, res |
10 | 3.0 Thu Nov 10 15:39:58 CET 2016 |
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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: very much larger intiial seed |
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| 23 | TODO: don't use RAND_pseudo_bytes :/ |
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| 24 | - INCOMPATIBLE CHANGE: core protocol version 1.0. |
11 | - INCOMPATIBLE CHANGE: core protocol version 1.0. |
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12 | - INCOMPATIBLE CHANGE: node sections are now introduced |
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13 | with "node nodename", not "node = nodename". |
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14 | - INCOMPATIBLE CHANGE: gvpectrl -g will now generate a single |
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15 | keypair, while -G will try to generate all keypairs as before. |
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16 | - openssl 1.0.2 is the latest supported openssl release, |
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17 | openssl 1.1.0 is not supported at the moment as the work to |
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18 | make it compatible to both versions is just too much. a switch |
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19 | to openssl 1.1 or another library will be done in a future release. |
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20 | - update examples to not generate keys centrally, but locally on each |
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21 | node. |
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22 | - add workaround for temporary/rare ENOBUFS condition. |
| 25 | - while individual packets couldn't be replayed, a whole session |
23 | - while individual packets couldn't be replayed, a whole session |
| 26 | could be replayed - this has been fixed by an extra key exchange. |
24 | could be replayed - this has been fixed by an extra key exchange. |
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25 | - fix a delete vs. delete [] mismatch in the central logging function. |
| 27 | - in addition to rsa key exchange and authentication, the handshake now |
26 | - in addition to rsa key exchange and authentication, the handshake now |
| 28 | adds a diffie-hellman key exchange (using curve25119) for perfect |
27 | adds a diffie-hellman key exchange (using curve25119) for perfect |
| 29 | forward secrecy. mac and cipher keys are derived using HKDF. |
28 | forward secrecy. mac and cipher keys are derived using HKDF. |
| 30 | - rsa key sizes are now configurable and larger (default is 3072). |
29 | - rsa key sizes are now configurable and larger (default is 3072). |
| 31 | correspondingly, the minimum mtu is no longer 296 but 576. |
30 | correspondingly, the minimum mtu is no longer 296 but 576. |
| 32 | - fixed a potential (unverified) buffer overrun on rsa decryption. |
31 | - fixed a potential (unverified) buffer overrun on rsa decryption. |
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32 | - new per-node low-power setting that tries to reduce cpu/network usage. |
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33 | - router reconnects could cause excessive rekeying on other connections. |
| 33 | - gvpectrl no longer generates all missing public keys, but |
34 | - gvpectrl no longer generates all missing public keys, but |
| 34 | only missing private keys. private keys are also put |
35 | only missing private keys. private keys are also put |
| 35 | into the configured location. |
36 | into the configured location. |
| 36 | - the pid-file now accepts %s as nodename as elsewhere. |
37 | - the pid-file now accepts %s as nodename as elsewhere. |
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38 | - switch to counter mode (only aes supported at the moment in |
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39 | openssl). this gets rid of the need to generate a random iv, |
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40 | is likely more secure (and, as a side effect, gets rid of |
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41 | slow randomness generation. counter mode is often faster |
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42 | then cbc mode as well, and packets are smaller). |
| 37 | - no longer use RAND_bytes to generate session keys - you NEED |
43 | - no longer use RAND_bytes to generate session keys - you NEED |
| 38 | a real source of entropy now (e.g. egd or /dev/random - see the |
44 | a real source of entropy now (e.g. egd or /dev/random - see the |
| 39 | openssl documentation). |
45 | openssl documentation). |
| 40 | |
46 | - multiple node statements for the same node are now supported |
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47 | and will be merged. |
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48 | - a new directive "global" switches back to the global section |
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49 | of the config file. |
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50 | - if-up scripts can now be specified with absolute paths. |
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51 | - new global option: serial, to detect configuration mismatches. |
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52 | - use HKDF as authentication proof, not HMAC or a plain hash |
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53 | (hint by Ilmari Karonen). |
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54 | - during rekeying or connection establishments, hmac authentication |
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55 | errors could occur and reset the connection. Transient hmac |
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56 | authentication errors are now being ignored for 3 seconds. |
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57 | - log the reason for a conneciton loss. |
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58 | - use a (hopefully) constant time memcmp to compare internal secrets. |
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59 | - fix a (harmless) errornous out of bounds stack read that would trigger |
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60 | gcc's -fsanitize=address. |
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61 | - bump old packet window size from 512 to 65536. |
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62 | - update for big changes in openssl 1.1 API, wrap primitives |
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63 | to make further changes easier. |
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64 | - correctly check return values for openssl 1.0.0 and later. |
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65 | - check for both public and private key file when deciding whether |
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66 | to skip generating a key to avoid accidental overwrites. |
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67 | |
| 41 | 2.25 Sat Jul 13 06:42:33 CEST 2013 |
68 | 2.25 Sat Jul 13 06:42:33 CEST 2013 |
| 42 | - INCOMPATIBLE CHANGE: no longer enable udp protocol if no other |
69 | - INCOMPATIBLE CHANGE: no longer enable udp protocol if no other |
| 43 | protocols are enabled - this is necessary when you have nodes with |
70 | protocols are enabled - this is necessary when you have nodes with |
| 44 | completely unknown protocols, to force mediated connection requests. |
71 | completely unknown protocols, to force mediated connection requests. |
| 45 | - INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2. |
72 | - INCOMPATIBLE CHANGE: dns transport protocol bumped to version 2. |
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| 54 | the protocol not being configured locally. |
81 | the protocol not being configured locally. |
| 55 | - new global configuration options: chroot, chuser, chuid, chgid, |
82 | - new global configuration options: chroot, chuser, chuid, chgid, |
| 56 | to chroot to a specified or anonymous new root, and change user id. |
83 | to chroot to a specified or anonymous new root, and change user id. |
| 57 | - new global configuration options seed_device and seed_interval, |
84 | - new global configuration options seed_device and seed_interval, |
| 58 | to configure another device than /dev/urandom for random seeds, |
85 | to configure another device than /dev/urandom for random seeds, |
| 59 | and to configure a regular imterval to reseed the rng. |
86 | and to configure a regular interval to reseed the rng. |
| 60 | - prefer inet_aton over gethostbyname, as the latter is not guaranteed |
87 | - prefer inet_aton over gethostbyname, as the latter is not guaranteed |
| 61 | to "resolve" literal ip addresses. |
88 | to "resolve" literal ip addresses. |
| 62 | - configure didn't detect openssl 1.0 because SHA1_version became private |
89 | - configure didn't detect openssl 1.0 because SHA1_version became private |
| 63 | (patch by TANIGUCHI Takaki). |
90 | (patch by TANIGUCHI Takaki). |
| 64 | - fix a bug where nodes would tell the other side that it supports |
91 | - fix a bug where nodes would tell the other side that it supports |
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| 69 | - gvpectrl no longer evaluates any "on" directives. |
96 | - gvpectrl no longer evaluates any "on" directives. |
| 70 | - icmp and rawip protocols weren't upgradable to each other. |
97 | - icmp and rawip protocols weren't upgradable to each other. |
| 71 | - major, but incremental, dns transport improvements: |
98 | - major, but incremental, dns transport improvements: |
| 72 | - do not simply abort in some error cases in the dns transport, |
99 | - do not simply abort in some error cases in the dns transport, |
| 73 | but try to recover. |
100 | but try to recover. |
| 74 | - allow lowercase/uppercase alises for base-n encodings that do |
101 | - allow lowercase/uppercase aliases for base-n encodings that do |
| 75 | not rely on case. |
102 | not rely on case. |
| 76 | - use base26 instead of base22 encoding for dns syn's, and |
103 | - use base26 instead of base22 encoding for dns syn's, and |
| 77 | base36 instead of base22 for headers (saves one byte/packet). |
104 | base36 instead of base22 for headers (saves one byte/packet). |
| 78 | - back off far quicker in dns tunnel when idling - increases |
105 | - back off far quicker in dns tunnel when idling - increases |
| 79 | latency on an idle link somewhat, but avoids hundreds of |
106 | latency on an idle link somewhat, but avoids hundreds of |
