… | |
… | |
50 | |
50 | |
51 | #if !HAVE_RAND_PSEUDO_BYTES |
51 | #if !HAVE_RAND_PSEUDO_BYTES |
52 | # define RAND_pseudo_bytes RAND_bytes |
52 | # define RAND_pseudo_bytes RAND_bytes |
53 | #endif |
53 | #endif |
54 | |
54 | |
55 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
55 | #define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol) |
|
|
56 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated) |
56 | |
57 | |
57 | #define ULTRA_FAST 1 |
58 | #define ULTRA_FAST 1 |
58 | #define HLOG 15 |
59 | #define HLOG 15 |
59 | #include "lzf/lzf.h" |
60 | #include "lzf/lzf.h" |
60 | #include "lzf/lzf_c.c" |
61 | #include "lzf/lzf_c.c" |
… | |
… | |
613 | rsaencrdata encr; |
614 | rsaencrdata encr; |
614 | |
615 | |
615 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
616 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
616 | { |
617 | { |
617 | config_packet::setup (PT_AUTH_REQ, dst); |
618 | config_packet::setup (PT_AUTH_REQ, dst); |
618 | strncpy (magic, MAGIC, 8); |
619 | strncpy (magic, MAGIC_OLD, 8); |
619 | initiate = !!initiate_; |
620 | initiate = !!initiate_; |
620 | protocols = protocols_; |
621 | protocols = protocols_; |
621 | |
622 | |
622 | len = sizeof (*this) - sizeof (net_packet); |
623 | len = sizeof (*this) - sizeof (net_packet); |
623 | } |
624 | } |
… | |
… | |
672 | ///////////////////////////////////////////////////////////////////////////// |
673 | ///////////////////////////////////////////////////////////////////////////// |
673 | |
674 | |
674 | void |
675 | void |
675 | connection::connection_established () |
676 | connection::connection_established () |
676 | { |
677 | { |
677 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
678 | slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
678 | |
679 | |
679 | if (ictx && octx) |
680 | if (ictx && octx) |
680 | { |
681 | { |
681 | // make sure rekeying timeouts are slightly asymmetric |
682 | // make sure rekeying timeouts are slightly asymmetric |
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
683 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
… | |
… | |
696 | { |
697 | { |
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
698 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
698 | delete p; |
699 | delete p; |
699 | } |
700 | } |
700 | } |
701 | } |
|
|
702 | |
|
|
703 | vpn->connection_established (this); |
701 | } |
704 | } |
702 | else |
705 | else |
703 | { |
706 | { |
704 | retry_cnt = 0; |
707 | retry_cnt = 0; |
705 | establish_connection.start (5); |
708 | establish_connection.start (5); |
… | |
… | |
709 | } |
712 | } |
710 | |
713 | |
711 | void |
714 | void |
712 | connection::reset_si () |
715 | connection::reset_si () |
713 | { |
716 | { |
|
|
717 | if (vpn->can_direct (THISNODE, conf)) |
714 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
718 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
715 | |
719 | else |
716 | // mask out endpoints we can't connect to |
|
|
717 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
718 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
719 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
720 | |
|
|
721 | if (protocol |
|
|
722 | && (!conf->can_direct (THISNODE) |
|
|
723 | || !THISNODE->can_direct (conf))) |
|
|
724 | { |
720 | { |
725 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
721 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
726 | protocol = 0; |
722 | protocol = 0; |
727 | } |
723 | } |
728 | |
724 | |
729 | si.set (conf, protocol); |
725 | si.set (conf, protocol); |
|
|
726 | |
|
|
727 | is_direct = si.valid (); |
730 | } |
728 | } |
731 | |
729 | |
732 | // ensure sockinfo is valid, forward if necessary |
730 | // ensure sockinfo is valid, forward if necessary |
733 | const sockinfo & |
731 | const sockinfo & |
734 | connection::forward_si (const sockinfo &si) const |
732 | connection::forward_si (const sockinfo &si) const |
735 | { |
733 | { |
736 | if (!si.valid ()) |
734 | if (!si.valid ()) |
737 | { |
735 | { |
738 | connection *r = vpn->find_router (); |
736 | connection *r = vpn->find_router_for (this); |
739 | |
737 | |
740 | if (r) |
738 | if (r) |
741 | { |
739 | { |
742 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
740 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
743 | conf->nodename, r->conf->nodename, (const char *)r->si); |
741 | conf->nodename, r->conf->nodename); |
744 | return r->si; |
742 | return r->si; |
745 | } |
743 | } |
746 | else |
744 | else |
747 | slog (L_DEBUG, _("%s: node unreachable, no common protocol, no router"), |
745 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
748 | conf->nodename); |
746 | conf->nodename); |
749 | } |
747 | } |
750 | |
748 | |
751 | return si; |
749 | return si; |
752 | } |
750 | } |
… | |
… | |
762 | connection::send_ping (const sockinfo &si, u8 pong) |
760 | connection::send_ping (const sockinfo &si, u8 pong) |
763 | { |
761 | { |
764 | ping_packet *pkt = new ping_packet; |
762 | ping_packet *pkt = new ping_packet; |
765 | |
763 | |
766 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
764 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
765 | |
|
|
766 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
|
|
767 | |
767 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
768 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
768 | |
769 | |
769 | delete pkt; |
770 | delete pkt; |
770 | } |
771 | } |
771 | |
772 | |
… | |
… | |
790 | |
791 | |
791 | rsachallenge chg; |
792 | rsachallenge chg; |
792 | rsa_cache.gen (pkt->id, chg); |
793 | rsa_cache.gen (pkt->id, chg); |
793 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
794 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
794 | |
795 | |
795 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
796 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
796 | |
797 | |
797 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
798 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
798 | |
799 | |
799 | delete pkt; |
800 | delete pkt; |
800 | } |
801 | } |
… | |
… | |
808 | |
809 | |
809 | rsa_hash (id, chg, pkt->response); |
810 | rsa_hash (id, chg, pkt->response); |
810 | |
811 | |
811 | pkt->hmac_set (octx); |
812 | pkt->hmac_set (octx); |
812 | |
813 | |
813 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
814 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
814 | |
815 | |
815 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
816 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
816 | |
817 | |
817 | delete pkt; |
818 | delete pkt; |
818 | } |
819 | } |
819 | |
820 | |
820 | void |
821 | void |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
822 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
822 | { |
823 | { |
823 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
824 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename, |
824 | conf->id, rid, (const char *)rsi); |
825 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi); |
825 | |
826 | |
826 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
827 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
827 | |
828 | |
828 | r->hmac_set (octx); |
829 | r->hmac_set (octx); |
829 | send_vpn_packet (r, si); |
830 | send_vpn_packet (r, si); |
… | |
… | |
856 | |
857 | |
857 | reset_si (); |
858 | reset_si (); |
858 | |
859 | |
859 | bool slow = si.prot & PROT_SLOW; |
860 | bool slow = si.prot & PROT_SLOW; |
860 | |
861 | |
861 | if (si.prot && !si.host) |
862 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
862 | { |
863 | { |
863 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
864 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
864 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
865 | w.start (1); |
865 | w.start (1); |
866 | vpn->send_connect_request (conf->id); |
866 | vpn->send_connect_request (this); |
867 | } |
867 | } |
868 | else |
868 | else |
869 | { |
869 | { |
870 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
870 | if (si.valid ()) |
|
|
871 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
872 | conf->nodename, (const char *)si); |
871 | |
873 | |
872 | const sockinfo &dsi = forward_si (si); |
874 | const sockinfo &dsi = forward_si (si); |
873 | |
875 | |
874 | slow = slow || (dsi.prot & PROT_SLOW); |
876 | slow = slow || (dsi.prot & PROT_SLOW); |
875 | |
877 | |
… | |
… | |
915 | dnsv4_reset_connection (); |
917 | dnsv4_reset_connection (); |
916 | #endif |
918 | #endif |
917 | |
919 | |
918 | si.host = 0; |
920 | si.host = 0; |
919 | |
921 | |
920 | last_activity = 0; |
922 | last_activity = 0.; |
|
|
923 | //last_si_change = 0.; |
921 | retry_cnt = 0; |
924 | retry_cnt = 0; |
922 | |
925 | |
923 | rekey.stop (); |
926 | rekey.stop (); |
924 | keepalive.stop (); |
927 | keepalive.stop (); |
925 | establish_connection.stop (); |
928 | establish_connection.stop (); |
… | |
… | |
932 | send_reset (si); |
935 | send_reset (si); |
933 | |
936 | |
934 | reset_connection (); |
937 | reset_connection (); |
935 | } |
938 | } |
936 | |
939 | |
|
|
940 | // poor-man's rekeying |
937 | inline void |
941 | inline void |
938 | connection::rekey_cb (ev::timer &w, int revents) |
942 | connection::rekey_cb (ev::timer &w, int revents) |
939 | { |
943 | { |
940 | reset_connection (); |
944 | reset_connection (); |
941 | establish_connection (); |
945 | establish_connection (); |
… | |
… | |
996 | void |
1000 | void |
997 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1001 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
998 | { |
1002 | { |
999 | last_activity = ev_now (); |
1003 | last_activity = ev_now (); |
1000 | |
1004 | |
1001 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1005 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
1002 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1006 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
1003 | |
1007 | |
1004 | if (connectmode == conf_node::C_DISABLED) |
1008 | if (connectmode == conf_node::C_DISABLED) |
1005 | return; |
1009 | return; |
1006 | |
1010 | |
1007 | switch (pkt->typ ()) |
1011 | switch (pkt->typ ()) |
1008 | { |
1012 | { |
1009 | case vpn_packet::PT_PING: |
1013 | case vpn_packet::PT_PING: |
|
|
1014 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1015 | |
1010 | // we send pings instead of auth packets after some retries, |
1016 | // we send pings instead of auth packets after some retries, |
1011 | // so reset the retry counter and establish a connection |
1017 | // so reset the retry counter and establish a connection |
1012 | // when we receive a ping. |
1018 | // when we receive a ping. |
1013 | if (!ictx) |
1019 | if (!ictx) |
1014 | { |
1020 | { |
1015 | if (auth_rate_limiter.can (rsi)) |
1021 | if (auth_rate_limiter.can (rsi)) |
1016 | send_auth_request (rsi, true); |
1022 | send_auth_request (rsi, true); |
1017 | } |
1023 | } |
1018 | else |
1024 | else |
|
|
1025 | // we would love to change thre socket address here, but ping's aren't |
|
|
1026 | // authenticated, so we best ignore it. |
1019 | send_ping (rsi, 1); // pong |
1027 | send_ping (rsi, 1); // pong |
1020 | |
1028 | |
1021 | break; |
1029 | break; |
1022 | |
1030 | |
1023 | case vpn_packet::PT_PONG: |
1031 | case vpn_packet::PT_PONG: |
|
|
1032 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
1024 | break; |
1033 | break; |
1025 | |
1034 | |
1026 | case vpn_packet::PT_RESET: |
1035 | case vpn_packet::PT_RESET: |
1027 | { |
1036 | { |
1028 | reset_connection (); |
1037 | reset_connection (); |
1029 | |
1038 | |
1030 | config_packet *p = (config_packet *) pkt; |
1039 | config_packet *p = (config_packet *) pkt; |
1031 | |
1040 | |
1032 | if (!p->chk_config ()) |
1041 | if (!p->chk_config ()) |
1033 | { |
1042 | { |
1034 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1043 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
1035 | conf->nodename, (const char *)rsi); |
1044 | conf->nodename, (const char *)rsi); |
1036 | connectmode = conf_node::C_DISABLED; |
1045 | connectmode = conf_node::C_DISABLED; |
1037 | } |
1046 | } |
1038 | else if (connectmode == conf_node::C_ALWAYS) |
1047 | else if (connectmode == conf_node::C_ALWAYS) |
1039 | establish_connection (); |
1048 | establish_connection (); |
… | |
… | |
1043 | case vpn_packet::PT_AUTH_REQ: |
1052 | case vpn_packet::PT_AUTH_REQ: |
1044 | if (auth_rate_limiter.can (rsi)) |
1053 | if (auth_rate_limiter.can (rsi)) |
1045 | { |
1054 | { |
1046 | auth_req_packet *p = (auth_req_packet *) pkt; |
1055 | auth_req_packet *p = (auth_req_packet *) pkt; |
1047 | |
1056 | |
1048 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1057 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply"); |
1049 | |
1058 | |
1050 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1059 | if (p->chk_config () |
|
|
1060 | && (!strncmp (p->magic, MAGIC_OLD, 8) || !strncmp (p->magic, MAGIC, 8))) |
1051 | { |
1061 | { |
1052 | if (p->prot_minor != PROTOCOL_MINOR) |
1062 | if (p->prot_minor != PROTOCOL_MINOR) |
1053 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1063 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1054 | conf->nodename, (const char *)rsi, |
1064 | conf->nodename, (const char *)rsi, |
1055 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1065 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
… | |
… | |
1081 | |
1091 | |
1082 | break; |
1092 | break; |
1083 | } |
1093 | } |
1084 | } |
1094 | } |
1085 | else |
1095 | else |
1086 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1096 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
1087 | conf->nodename, (const char *)rsi); |
1097 | conf->nodename, (const char *)rsi); |
1088 | |
1098 | |
1089 | send_reset (rsi); |
1099 | send_reset (rsi); |
1090 | } |
1100 | } |
1091 | |
1101 | |
1092 | break; |
1102 | break; |
1093 | |
1103 | |
1094 | case vpn_packet::PT_AUTH_RES: |
1104 | case vpn_packet::PT_AUTH_RES: |
1095 | { |
1105 | { |
1096 | auth_res_packet *p = (auth_res_packet *) pkt; |
1106 | auth_res_packet *p = (auth_res_packet *)pkt; |
1097 | |
1107 | |
1098 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1108 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
1099 | |
1109 | |
1100 | if (p->chk_config ()) |
1110 | if (p->chk_config ()) |
1101 | { |
1111 | { |
1102 | if (p->prot_minor != PROTOCOL_MINOR) |
1112 | if (p->prot_minor != PROTOCOL_MINOR) |
1103 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1113 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
1106 | |
1116 | |
1107 | rsachallenge chg; |
1117 | rsachallenge chg; |
1108 | |
1118 | |
1109 | if (!rsa_cache.find (p->id, chg)) |
1119 | if (!rsa_cache.find (p->id, chg)) |
1110 | { |
1120 | { |
1111 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1121 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
1112 | conf->nodename, (const char *)rsi); |
1122 | conf->nodename, (const char *)rsi); |
1113 | break; |
1123 | break; |
1114 | } |
1124 | } |
1115 | else |
1125 | else |
1116 | { |
1126 | { |
1117 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1127 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1118 | |
1128 | |
1119 | if (!p->hmac_chk (cctx)) |
1129 | if (!p->hmac_chk (cctx)) |
1120 | { |
1130 | { |
1121 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1131 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1122 | "could be an attack, or just corruption or a synchronization error"), |
1132 | "could be an attack, or just corruption or a synchronization error."), |
1123 | conf->nodename, (const char *)rsi); |
1133 | conf->nodename, (const char *)rsi); |
1124 | break; |
1134 | break; |
1125 | } |
1135 | } |
1126 | else |
1136 | else |
1127 | { |
1137 | { |
… | |
… | |
1138 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1148 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1139 | |
1149 | |
1140 | si = rsi; |
1150 | si = rsi; |
1141 | protocol = rsi.prot; |
1151 | protocol = rsi.prot; |
1142 | |
1152 | |
|
|
1153 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
1154 | conf->nodename, (const char *)rsi, |
|
|
1155 | is_direct ? "direct" : "forwarded", |
|
|
1156 | p->prot_major, p->prot_minor); |
|
|
1157 | |
1143 | connection_established (); |
1158 | connection_established (); |
1144 | |
|
|
1145 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1146 | conf->nodename, (const char *)rsi, |
|
|
1147 | p->prot_major, p->prot_minor); |
|
|
1148 | |
1159 | |
1149 | if (::conf.script_node_up) |
1160 | if (::conf.script_node_up) |
1150 | { |
1161 | { |
1151 | run_script_cb *cb = new run_script_cb; |
1162 | run_script_cb *cb = new run_script_cb; |
1152 | cb->set<connection, &connection::script_node_up> (this); |
1163 | cb->set<connection, &connection::script_node_up> (this); |
… | |
… | |
1154 | } |
1165 | } |
1155 | |
1166 | |
1156 | break; |
1167 | break; |
1157 | } |
1168 | } |
1158 | else |
1169 | else |
1159 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1170 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
1160 | conf->nodename, (const char *)rsi); |
1171 | conf->nodename, (const char *)rsi); |
1161 | } |
1172 | } |
1162 | |
1173 | |
1163 | delete cctx; |
1174 | delete cctx; |
1164 | } |
1175 | } |
… | |
… | |
1180 | { |
1191 | { |
1181 | vpndata_packet *p = (vpndata_packet *)pkt; |
1192 | vpndata_packet *p = (vpndata_packet *)pkt; |
1182 | |
1193 | |
1183 | if (!p->hmac_chk (ictx)) |
1194 | if (!p->hmac_chk (ictx)) |
1184 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1195 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1185 | "could be an attack, or just corruption or a synchronization error"), |
1196 | "could be an attack, or just corruption or a synchronization error."), |
1186 | conf->nodename, (const char *)rsi); |
1197 | conf->nodename, (const char *)rsi); |
1187 | else |
1198 | else |
1188 | { |
1199 | { |
1189 | u32 seqno; |
1200 | u32 seqno; |
1190 | tap_packet *d = p->unpack (this, seqno); |
1201 | tap_packet *d = p->unpack (this, seqno); |
|
|
1202 | int seqclass = iseqno.seqno_classify (seqno); |
1191 | |
1203 | |
1192 | if (iseqno.recv_ok (seqno)) |
1204 | if (seqclass == 0) // ok |
1193 | { |
1205 | { |
1194 | vpn->tap->send (d); |
1206 | vpn->tap->send (d); |
1195 | |
1207 | |
1196 | if (si != rsi) |
1208 | if (si != rsi) |
1197 | { |
1209 | { |
1198 | // fast re-sync on source address changes, useful especially for tcp/ip |
1210 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1211 | //if (last_si_change < ev_now () + 5.) |
1199 | si = rsi; |
1212 | // { |
1200 | |
|
|
1201 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1213 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1202 | conf->nodename, (const char *)si, (const char *)rsi); |
1214 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1215 | |
|
|
1216 | si = rsi; |
|
|
1217 | |
|
|
1218 | if (::conf.script_node_change) |
|
|
1219 | { |
|
|
1220 | run_script_cb *cb = new run_script_cb; |
|
|
1221 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1222 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1223 | } |
|
|
1224 | |
|
|
1225 | // } |
|
|
1226 | //else |
|
|
1227 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1228 | // conf->nodename, (const char *)si, (const char *)rsi); |
1203 | } |
1229 | } |
|
|
1230 | } |
|
|
1231 | else if (seqclass == 1) // far history |
|
|
1232 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1233 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1234 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1235 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1236 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1237 | else if (seqclass == 3) // reset |
|
|
1238 | { |
|
|
1239 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1240 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1241 | send_reset (rsi); |
1204 | } |
1242 | } |
1205 | |
1243 | |
1206 | delete d; |
1244 | delete d; |
1207 | break; |
1245 | break; |
1208 | } |
1246 | } |
… | |
… | |
1212 | break; |
1250 | break; |
1213 | |
1251 | |
1214 | case vpn_packet::PT_CONNECT_REQ: |
1252 | case vpn_packet::PT_CONNECT_REQ: |
1215 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1253 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1216 | { |
1254 | { |
1217 | connect_req_packet *p = (connect_req_packet *) pkt; |
1255 | connect_req_packet *p = (connect_req_packet *)pkt; |
1218 | |
1256 | |
1219 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1257 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1220 | { |
1258 | { |
1221 | connection *c = vpn->conns[p->id - 1]; |
1259 | connection *c = vpn->conns[p->id - 1]; |
1222 | conf->protocols = p->protocols; |
1260 | conf->protocols = p->protocols; |
1223 | |
1261 | |
1224 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
1262 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]", |
1225 | conf->id, p->id, c->ictx && c->octx); |
1263 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx); |
1226 | |
1264 | |
1227 | if (c->ictx && c->octx) |
1265 | if (c->ictx && c->octx) |
1228 | { |
1266 | { |
1229 | // send connect_info packets to both sides, in case one is |
1267 | // send connect_info packets to both sides, in case one is |
1230 | // behind a nat firewall (or both ;) |
1268 | // behind a nat firewall (or both ;) |
… | |
… | |
1253 | |
1291 | |
1254 | c->conf->protocols = p->protocols; |
1292 | c->conf->protocols = p->protocols; |
1255 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1293 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1256 | p->si.upgrade_protocol (protocol, c->conf); |
1294 | p->si.upgrade_protocol (protocol, c->conf); |
1257 | |
1295 | |
1258 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1296 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]", |
|
|
1297 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
1259 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1298 | (const char *)p->si, !c->ictx && !c->octx); |
1260 | |
1299 | |
1261 | const sockinfo &dsi = forward_si (p->si); |
1300 | const sockinfo &dsi = forward_si (p->si); |
1262 | |
1301 | |
1263 | if (dsi.valid ()) |
1302 | if (dsi.valid ()) |
1264 | c->send_auth_request (dsi, true); |
1303 | c->send_auth_request (dsi, true); |
… | |
… | |
1278 | } |
1317 | } |
1279 | |
1318 | |
1280 | inline void |
1319 | inline void |
1281 | connection::keepalive_cb (ev::timer &w, int revents) |
1320 | connection::keepalive_cb (ev::timer &w, int revents) |
1282 | { |
1321 | { |
1283 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1322 | if (ev_now () >= last_activity + ::conf.keepalive + 15) |
1284 | { |
1323 | { |
1285 | reset_connection (); |
1324 | reset_connection (); |
1286 | establish_connection (); |
1325 | establish_connection (); |
1287 | } |
1326 | } |
1288 | else if (ev_now () < last_activity + ::conf.keepalive) |
1327 | else if (ev_now () < last_activity + ::conf.keepalive) |
1289 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1328 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1290 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1329 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1291 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1330 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1292 | { |
1331 | { |
1293 | send_ping (si); |
1332 | send_ping (si); |
1294 | w.start (5); |
1333 | w.start (3); |
1295 | } |
1334 | } |
1296 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1335 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1297 | // hold ondemand connections implicitly a few seconds longer |
1336 | // hold ondemand connections implicitly a few seconds longer |
1298 | // should delete octx, though, or something like that ;) |
1337 | // should delete octx, though, or something like that ;) |
1299 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1338 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
… | |
… | |
1303 | |
1342 | |
1304 | void connection::send_connect_request (int id) |
1343 | void connection::send_connect_request (int id) |
1305 | { |
1344 | { |
1306 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1345 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1307 | |
1346 | |
1308 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1347 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)", |
|
|
1348 | conf->nodename, vpn->conns[id - 1]->conf->nodename); |
1309 | p->hmac_set (octx); |
1349 | p->hmac_set (octx); |
1310 | send_vpn_packet (p, si); |
1350 | send_vpn_packet (p, si); |
1311 | |
1351 | |
1312 | delete p; |
1352 | delete p; |
1313 | } |
1353 | } |
1314 | |
1354 | |
1315 | void connection::script_init_env (const char *ext) |
1355 | void connection::script_init_env (const char *ext) |
1316 | { |
1356 | { |
1317 | char *env; |
1357 | char *env; |
1318 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1358 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1319 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1359 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1320 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1360 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1321 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1361 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1322 | conf->id & 0xff); putenv (env); |
1362 | conf->id & 0xff); putenv (env); |
1323 | } |
1363 | } |
1324 | |
1364 | |
1325 | void connection::script_init_connect_env () |
1365 | void connection::script_init_connect_env () |
1326 | { |
1366 | { |
1327 | vpn->script_init_env (); |
1367 | vpn->script_init_env (); |
1328 | |
1368 | |
1329 | char *env; |
1369 | char *env; |
1330 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1370 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1371 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1331 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1372 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1332 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1373 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1333 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1374 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1334 | } |
1375 | } |
1335 | |
1376 | |
1336 | inline const char * |
1377 | inline const char * |
1337 | connection::script_node_up () |
1378 | connection::script_node_up () |
1338 | { |
1379 | { |
… | |
… | |
1343 | char *filename; |
1384 | char *filename; |
1344 | asprintf (&filename, |
1385 | asprintf (&filename, |
1345 | "%s/%s", |
1386 | "%s/%s", |
1346 | confbase, |
1387 | confbase, |
1347 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1388 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
|
|
1389 | |
|
|
1390 | return filename; |
|
|
1391 | } |
|
|
1392 | |
|
|
1393 | inline const char * |
|
|
1394 | connection::script_node_change () |
|
|
1395 | { |
|
|
1396 | script_init_connect_env (); |
|
|
1397 | |
|
|
1398 | putenv ((char *)"STATE=change"); |
|
|
1399 | |
|
|
1400 | char *filename; |
|
|
1401 | asprintf (&filename, |
|
|
1402 | "%s/%s", |
|
|
1403 | confbase, |
|
|
1404 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
1348 | |
1405 | |
1349 | return filename; |
1406 | return filename; |
1350 | } |
1407 | } |
1351 | |
1408 | |
1352 | inline const char * |
1409 | inline const char * |