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