… | |
… | |
56 | #include "hkdf.h" |
56 | #include "hkdf.h" |
57 | |
57 | |
58 | #include "netcompat.h" |
58 | #include "netcompat.h" |
59 | |
59 | |
60 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic |
60 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic |
61 | #define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D |
|
|
62 | |
61 | |
63 | #define ULTRA_FAST 1 |
62 | #define ULTRA_FAST 1 |
64 | #define HLOG 15 |
63 | #define HLOG 15 |
65 | #include "lzf/lzf.h" |
64 | #include "lzf/lzf.h" |
66 | #include "lzf/lzf_c.c" |
65 | #include "lzf/lzf_c.c" |
… | |
… | |
390 | bool |
389 | bool |
391 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
390 | hmac_packet::hmac_chk (crypto_ctx *ctx) |
392 | { |
391 | { |
393 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
392 | unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
394 | hmac_gen (ctx, hmac_digest); |
393 | hmac_gen (ctx, hmac_digest); |
395 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
394 | return slow_memeq (hmac, hmac_digest, HMACLENGTH); |
396 | } |
395 | } |
397 | |
396 | |
398 | void |
397 | void |
399 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
398 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
400 | { |
399 | { |
… | |
… | |
701 | si = rsi; |
700 | si = rsi; |
702 | protocol = rsi.prot; |
701 | protocol = rsi.prot; |
703 | |
702 | |
704 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
703 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
705 | conf->nodename, (const char *)rsi, |
704 | conf->nodename, (const char *)rsi, |
706 | is_direct ? "direct" : "forwarded", |
705 | vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded", |
707 | PROTOCOL_MAJOR, prot_minor); |
706 | PROTOCOL_MAJOR, prot_minor); |
708 | |
707 | |
709 | if (::conf.script_node_up) |
708 | if (::conf.script_node_up) |
710 | { |
709 | { |
711 | run_script_cb *cb = new run_script_cb; |
710 | run_script_cb *cb = new run_script_cb; |
… | |
… | |
723 | |
722 | |
724 | // make sure rekeying timeouts are slightly asymmetric |
723 | // make sure rekeying timeouts are slightly asymmetric |
725 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
724 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
726 | rekey.start (rekey_interval, rekey_interval); |
725 | rekey.start (rekey_interval, rekey_interval); |
727 | |
726 | |
|
|
727 | hmac_error = 0.; |
|
|
728 | |
728 | keepalive.start (::conf.keepalive); |
729 | keepalive.start (::conf.keepalive); |
729 | |
730 | |
730 | // send queued packets |
731 | // send queued packets |
731 | if (ictx && octx) |
|
|
732 | { |
|
|
733 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
732 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
734 | { |
733 | { |
735 | if (p->len) send_data_packet (p); |
734 | if (p->len) send_data_packet (p); |
736 | delete p; |
735 | delete p; |
737 | } |
736 | } |
738 | |
737 | |
739 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
738 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
740 | { |
739 | { |
741 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
740 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
742 | delete p; |
741 | delete p; |
743 | } |
|
|
744 | } |
742 | } |
745 | |
743 | |
746 | vpn->connection_established (this); |
744 | vpn->connection_established (this); |
747 | } |
745 | } |
748 | |
746 | |
… | |
… | |
756 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
754 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
757 | protocol = 0; |
755 | protocol = 0; |
758 | } |
756 | } |
759 | |
757 | |
760 | si.set (conf, protocol); |
758 | si.set (conf, protocol); |
761 | |
|
|
762 | is_direct = si.valid (); |
|
|
763 | } |
759 | } |
764 | |
760 | |
765 | // ensure sockinfo is valid, forward if necessary |
761 | // ensure sockinfo is valid, forward if necessary |
766 | const sockinfo & |
762 | const sockinfo & |
767 | connection::forward_si (const sockinfo &si) const |
763 | connection::forward_si (const sockinfo &si) const |
… | |
… | |
786 | |
782 | |
787 | void |
783 | void |
788 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
784 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
789 | { |
785 | { |
790 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
786 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
791 | reset_connection (); |
787 | reset_connection ("packet send error"); |
792 | } |
788 | } |
793 | |
789 | |
794 | void |
790 | void |
795 | connection::send_ping (const sockinfo &si, u8 pong) |
791 | connection::send_ping (const sockinfo &si, u8 pong) |
796 | { |
792 | { |
… | |
… | |
872 | { |
868 | { |
873 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
869 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
874 | // and stop trying. should probably be handled by a per-connection expire handler. |
870 | // and stop trying. should probably be handled by a per-connection expire handler. |
875 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
871 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
876 | { |
872 | { |
877 | reset_connection (); |
873 | reset_connection ("no demand"); |
878 | return; |
874 | return; |
879 | } |
875 | } |
880 | |
876 | |
881 | last_establish_attempt = ev_now (); |
877 | last_establish_attempt = ev_now (); |
882 | |
878 | |
… | |
… | |
884 | ? (retry_cnt & 3) + 1 |
880 | ? (retry_cnt & 3) + 1 |
885 | : 1 << (retry_cnt >> 2)); |
881 | : 1 << (retry_cnt >> 2)); |
886 | |
882 | |
887 | reset_si (); |
883 | reset_si (); |
888 | |
884 | |
889 | bool slow = si.prot & PROT_SLOW; |
885 | bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power); |
890 | |
886 | |
891 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
887 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
892 | { |
888 | { |
893 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
889 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
894 | w.start (1); |
890 | w.start (1); |
… | |
… | |
904 | |
900 | |
905 | slow = slow || (dsi.prot & PROT_SLOW); |
901 | slow = slow || (dsi.prot & PROT_SLOW); |
906 | |
902 | |
907 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
903 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
908 | { |
904 | { |
909 | if (retry_cnt < 4) |
905 | // use ping after the first few retries |
|
|
906 | // TODO: on rekeys, the other node might not interpret ping correctly, |
|
|
907 | // TODO: as it will still have a valid connection |
|
|
908 | if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power)) |
910 | send_auth_request (dsi, true); |
909 | send_auth_request (dsi, true); |
911 | else |
910 | else |
912 | send_ping (dsi, 0); |
911 | send_ping (dsi, 0); |
913 | } |
912 | } |
914 | } |
913 | } |
915 | |
914 | |
916 | retry_int *= slow ? 8. : 0.9; |
915 | retry_int *= slow ? 4. : 0.9; |
917 | |
916 | |
918 | if (retry_int < conf->max_retry) |
917 | if (retry_int < conf->max_retry) |
919 | retry_cnt++; |
918 | retry_cnt++; |
920 | else |
919 | else |
921 | retry_int = conf->max_retry; |
920 | retry_int = conf->max_retry; |
… | |
… | |
923 | w.start (retry_int); |
922 | w.start (retry_int); |
924 | } |
923 | } |
925 | } |
924 | } |
926 | |
925 | |
927 | void |
926 | void |
928 | connection::reset_connection () |
927 | connection::reset_connection (const char *reason) |
929 | { |
928 | { |
930 | if (ictx && octx) |
929 | if (ictx && octx) |
931 | { |
930 | { |
932 | slog (L_INFO, _("%s(%s): connection lost"), |
931 | slog (L_INFO, _("%s(%s): connection lost (%s)"), |
933 | conf->nodename, (const char *)si); |
932 | conf->nodename, (const char *)si, reason); |
934 | |
933 | |
935 | if (::conf.script_node_down) |
934 | if (::conf.script_node_down) |
936 | { |
935 | { |
937 | run_script_cb *cb = new run_script_cb; |
936 | run_script_cb *cb = new run_script_cb; |
938 | cb->set<connection, &connection::script_node_down> (this); |
937 | cb->set<connection, &connection::script_node_down> (this); |
… | |
… | |
962 | connection::shutdown () |
961 | connection::shutdown () |
963 | { |
962 | { |
964 | if (ictx && octx) |
963 | if (ictx && octx) |
965 | send_reset (si); |
964 | send_reset (si); |
966 | |
965 | |
967 | reset_connection (); |
966 | reset_connection ("shutdown"); |
968 | } |
967 | } |
969 | |
968 | |
970 | // poor-man's rekeying |
969 | // poor-man's rekeying |
971 | inline void |
970 | inline void |
972 | connection::rekey_cb (ev::timer &w, int revents) |
971 | connection::rekey_cb (ev::timer &w, int revents) |
973 | { |
972 | { |
974 | reset_connection (); |
973 | reset_connection ("rekeying"); |
975 | establish_connection (); |
974 | establish_connection (); |
976 | } |
975 | } |
977 | |
976 | |
978 | void |
977 | void |
979 | connection::send_data_packet (tap_packet *pkt) |
978 | connection::send_data_packet (tap_packet *pkt) |
… | |
… | |
996 | |
995 | |
997 | void |
996 | void |
998 | connection::post_inject_queue () |
997 | connection::post_inject_queue () |
999 | { |
998 | { |
1000 | // force a connection every now and when when packets are sent (max 1/s) |
999 | // force a connection every now and when when packets are sent (max 1/s) |
1001 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
1000 | if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary |
1002 | establish_connection.stop (); |
1001 | establish_connection.stop (); |
1003 | |
1002 | |
1004 | establish_connection (); |
1003 | establish_connection (); |
1005 | } |
1004 | } |
1006 | |
1005 | |
… | |
… | |
1066 | // about our desire for communication. |
1065 | // about our desire for communication. |
1067 | establish_connection (); |
1066 | establish_connection (); |
1068 | break; |
1067 | break; |
1069 | |
1068 | |
1070 | case vpn_packet::PT_RESET: |
1069 | case vpn_packet::PT_RESET: |
|
|
1070 | slog (L_TRACE, "%s >> PT_RESET", conf->nodename); |
|
|
1071 | |
|
|
1072 | if (ictx && octx) |
1071 | { |
1073 | { |
1072 | reset_connection (); |
1074 | reset_connection ("remote reset"); |
1073 | |
1075 | |
1074 | config_packet *p = (config_packet *) pkt; |
1076 | config_packet *p = (config_packet *) pkt; |
1075 | |
1077 | |
1076 | if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS) |
1078 | if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS) |
1077 | establish_connection (); |
1079 | establish_connection (); |
1078 | } |
1080 | } |
|
|
1081 | |
1079 | break; |
1082 | break; |
1080 | |
1083 | |
1081 | case vpn_packet::PT_AUTH_REQ: |
1084 | case vpn_packet::PT_AUTH_REQ: |
1082 | if (auth_rate_limiter.can (rsi)) |
1085 | if (auth_rate_limiter.can (rsi)) |
1083 | { |
1086 | { |
… | |
… | |
1098 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1101 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1099 | conf->nodename, (const char *)rsi, |
1102 | conf->nodename, (const char *)rsi, |
1100 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1103 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1101 | |
1104 | |
1102 | if (p->initiate) |
1105 | if (p->initiate) |
|
|
1106 | { |
1103 | send_auth_request (rsi, false); |
1107 | send_auth_request (rsi, false); |
|
|
1108 | |
|
|
1109 | if (ictx && octx) |
|
|
1110 | reset_connection ("reconnect"); |
|
|
1111 | } |
1104 | |
1112 | |
1105 | auth_data auth; |
1113 | auth_data auth; |
1106 | |
1114 | |
1107 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
1115 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
1108 | { |
1116 | { |
1109 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1117 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1110 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1118 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1111 | } |
1119 | } |
1112 | else |
1120 | else |
1113 | { |
1121 | { |
1114 | bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth); |
1122 | bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth); |
1115 | |
1123 | |
1116 | rcv_auth = auth; |
1124 | rcv_auth = auth; |
1117 | have_rcv_auth = true; |
1125 | have_rcv_auth = true; |
1118 | |
1126 | |
1119 | send_auth_response (rsi); |
1127 | send_auth_response (rsi); |
… | |
… | |
1142 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
1150 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
1143 | |
1151 | |
1144 | auth_mac local_mac; |
1152 | auth_mac local_mac; |
1145 | auth_hash (snd_auth, p->response.ecdh, local_mac); |
1153 | auth_hash (snd_auth, p->response.ecdh, local_mac); |
1146 | |
1154 | |
1147 | if (memcmp (&p->response.mac, local_mac, sizeof local_mac)) |
1155 | if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac)) |
1148 | { |
1156 | { |
1149 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
1157 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
1150 | conf->nodename, (const char *)rsi); |
1158 | conf->nodename, (const char *)rsi); |
1151 | } |
1159 | } |
1152 | else if (!have_snd_auth) |
1160 | else if (!have_snd_auth) |
… | |
… | |
1170 | if (ictx && octx) |
1178 | if (ictx && octx) |
1171 | { |
1179 | { |
1172 | vpndata_packet *p = (vpndata_packet *)pkt; |
1180 | vpndata_packet *p = (vpndata_packet *)pkt; |
1173 | |
1181 | |
1174 | if (!p->hmac_chk (ictx)) |
1182 | if (!p->hmac_chk (ictx)) |
|
|
1183 | { |
|
|
1184 | // rekeying often creates temporary hmac auth floods |
|
|
1185 | // we assume they don't take longer than a few seconds normally, |
|
|
1186 | // and suppress messages and resets during that time. |
|
|
1187 | //TODO: should be done per source address |
|
|
1188 | if (!hmac_error) |
|
|
1189 | { |
|
|
1190 | hmac_error = ev_now () + 3; |
|
|
1191 | break; |
|
|
1192 | } |
|
|
1193 | else if (hmac_error >= ev_now ()) |
|
|
1194 | break; // silently suppress |
|
|
1195 | else |
|
|
1196 | { |
1175 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1197 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1176 | "could be an attack, or just corruption or a synchronization error."), |
1198 | "could be an attack, or just corruption or a synchronization error."), |
1177 | conf->nodename, (const char *)rsi); |
1199 | conf->nodename, (const char *)rsi); |
|
|
1200 | // reset |
|
|
1201 | } |
|
|
1202 | } |
1178 | else |
1203 | else |
1179 | { |
1204 | { |
1180 | u32 seqno; |
1205 | u32 seqno; |
1181 | tap_packet *d = p->unpack (this, seqno); |
1206 | tap_packet *d = p->unpack (this, seqno); |
1182 | int seqclass = iseqno.seqno_classify (seqno); |
1207 | int seqclass = iseqno.seqno_classify (seqno); |
|
|
1208 | |
|
|
1209 | hmac_error = 0; |
1183 | |
1210 | |
1184 | if (seqclass == 0) // ok |
1211 | if (seqclass == 0) // ok |
1185 | { |
1212 | { |
1186 | vpn->tap->send (d); |
1213 | vpn->tap->send (d); |
1187 | |
1214 | |
… | |
… | |
1314 | |
1341 | |
1315 | if (when >= 0) |
1342 | if (when >= 0) |
1316 | w.start (when); |
1343 | w.start (when); |
1317 | else if (when < -15) |
1344 | else if (when < -15) |
1318 | { |
1345 | { |
1319 | reset_connection (); |
1346 | reset_connection ("keepalive overdue"); |
1320 | establish_connection (); |
1347 | establish_connection (); |
1321 | } |
1348 | } |
1322 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1349 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1323 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1350 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1324 | { |
1351 | { |
… | |
… | |
1328 | else if (when >= -10) |
1355 | else if (when >= -10) |
1329 | // hold ondemand connections implicitly a few seconds longer |
1356 | // hold ondemand connections implicitly a few seconds longer |
1330 | // should delete octx, though, or something like that ;) |
1357 | // should delete octx, though, or something like that ;) |
1331 | w.start (when + 10); |
1358 | w.start (when + 10); |
1332 | else |
1359 | else |
1333 | reset_connection (); |
1360 | reset_connection ("keepalive timeout"); |
1334 | } |
1361 | } |
1335 | |
1362 | |
1336 | void |
1363 | void |
1337 | connection::send_connect_request (int id) |
1364 | connection::send_connect_request (int id) |
1338 | { |
1365 | { |
… | |
… | |
1438 | |
1465 | |
1439 | // queue a dummy packet to force an initial connection attempt |
1466 | // queue a dummy packet to force an initial connection attempt |
1440 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1467 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1441 | vpn_queue.put (new net_packet); |
1468 | vpn_queue.put (new net_packet); |
1442 | |
1469 | |
1443 | reset_connection (); |
1470 | reset_connection ("startup"); |
1444 | } |
1471 | } |
1445 | |
1472 | |
1446 | connection::~connection () |
1473 | connection::~connection () |
1447 | { |
1474 | { |
1448 | shutdown (); |
1475 | shutdown (); |