1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
9 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
10 | (at your option) any later version. |
10 | option) any later version. |
11 | |
11 | |
12 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, but |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
15 | GNU General Public License for more details. |
15 | Public License for more details. |
16 | |
16 | |
17 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License along |
18 | along with gvpe; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | |
|
|
20 | Additional permission under GNU GPL version 3 section 7 |
|
|
21 | |
|
|
22 | If you modify this Program, or any covered work, by linking or |
|
|
23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
|
|
24 | version of that library), containing parts covered by the terms of the |
|
|
25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
|
|
26 | additional permission to convey the resulting work. Corresponding |
|
|
27 | Source for a non-source form of such a combination shall include the |
|
|
28 | source code for the parts of OpenSSL used as well as that of the |
|
|
29 | covered work. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #include <list> |
34 | #include <list> |
|
|
35 | #include <queue> |
|
|
36 | #include <utility> |
25 | |
37 | |
26 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
27 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
28 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
29 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
… | |
… | |
45 | #define ULTRA_FAST 1 |
57 | #define ULTRA_FAST 1 |
46 | #define HLOG 15 |
58 | #define HLOG 15 |
47 | #include "lzf/lzf.h" |
59 | #include "lzf/lzf.h" |
48 | #include "lzf/lzf_c.c" |
60 | #include "lzf/lzf_c.c" |
49 | #include "lzf/lzf_d.c" |
61 | #include "lzf/lzf_d.c" |
|
|
62 | |
|
|
63 | ////////////////////////////////////////////////////////////////////////////// |
|
|
64 | |
|
|
65 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
|
|
66 | static ev::child rs_child_ev; |
|
|
67 | |
|
|
68 | void // c++ requires external linkage here, apparently :( |
|
|
69 | rs_child_cb (ev::child &w, int revents) |
|
|
70 | { |
|
|
71 | w.stop (); |
|
|
72 | |
|
|
73 | if (rs_queue.empty ()) |
|
|
74 | return; |
|
|
75 | |
|
|
76 | pid_t pid = run_script (*rs_queue.front ().first, false); |
|
|
77 | if (pid) |
|
|
78 | { |
|
|
79 | w.set (pid); |
|
|
80 | w.start (); |
|
|
81 | } |
|
|
82 | else |
|
|
83 | slog (L_WARN, rs_queue.front ().second); |
|
|
84 | |
|
|
85 | delete rs_queue.front ().first; |
|
|
86 | rs_queue.pop (); |
|
|
87 | } |
|
|
88 | |
|
|
89 | // despite the fancy name, this is quite a hack |
|
|
90 | static void |
|
|
91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
|
|
92 | { |
|
|
93 | rs_queue.push (std::make_pair (cb, warnmsg)); |
|
|
94 | |
|
|
95 | if (!rs_child_ev.is_active ()) |
|
|
96 | { |
|
|
97 | rs_child_ev.set<rs_child_cb> (); |
|
|
98 | rs_child_ev (); |
|
|
99 | } |
|
|
100 | } |
|
|
101 | |
|
|
102 | ////////////////////////////////////////////////////////////////////////////// |
50 | |
103 | |
51 | struct crypto_ctx |
104 | struct crypto_ctx |
52 | { |
105 | { |
53 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
… | |
… | |
619 | ///////////////////////////////////////////////////////////////////////////// |
672 | ///////////////////////////////////////////////////////////////////////////// |
620 | |
673 | |
621 | void |
674 | void |
622 | connection::connection_established () |
675 | connection::connection_established () |
623 | { |
676 | { |
624 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
677 | slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
625 | |
678 | |
626 | if (ictx && octx) |
679 | if (ictx && octx) |
627 | { |
680 | { |
628 | // make sure rekeying timeouts are slightly asymmetric |
681 | // make sure rekeying timeouts are slightly asymmetric |
629 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
682 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
… | |
… | |
643 | { |
696 | { |
644 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
697 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
645 | delete p; |
698 | delete p; |
646 | } |
699 | } |
647 | } |
700 | } |
|
|
701 | |
|
|
702 | vpn->connection_established (this); |
648 | } |
703 | } |
649 | else |
704 | else |
650 | { |
705 | { |
651 | retry_cnt = 0; |
706 | retry_cnt = 0; |
652 | establish_connection.start (5); |
707 | establish_connection.start (5); |
… | |
… | |
656 | } |
711 | } |
657 | |
712 | |
658 | void |
713 | void |
659 | connection::reset_si () |
714 | connection::reset_si () |
660 | { |
715 | { |
|
|
716 | if (vpn->can_direct (THISNODE, conf)) |
661 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
717 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
662 | |
718 | else |
663 | // mask out protocols we cannot establish |
|
|
664 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
665 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
666 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
667 | |
|
|
668 | if (protocol |
|
|
669 | && (!conf->can_direct (THISNODE) |
|
|
670 | || !THISNODE->can_direct (conf))) |
|
|
671 | { |
719 | { |
672 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
720 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
673 | protocol = 0; |
721 | protocol = 0; |
674 | } |
722 | } |
675 | |
723 | |
676 | si.set (conf, protocol); |
724 | si.set (conf, protocol); |
|
|
725 | |
|
|
726 | is_direct = si.valid (); |
677 | } |
727 | } |
678 | |
728 | |
679 | // ensure sockinfo is valid, forward if necessary |
729 | // ensure sockinfo is valid, forward if necessary |
680 | const sockinfo & |
730 | const sockinfo & |
681 | connection::forward_si (const sockinfo &si) const |
731 | connection::forward_si (const sockinfo &si) const |
682 | { |
732 | { |
683 | if (!si.valid ()) |
733 | if (!si.valid ()) |
684 | { |
734 | { |
685 | connection *r = vpn->find_router (); |
735 | connection *r = vpn->find_router_for (this); |
686 | |
736 | |
687 | if (r) |
737 | if (r) |
688 | { |
738 | { |
689 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
739 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
690 | conf->nodename, r->conf->nodename, (const char *)r->si); |
740 | conf->nodename, r->conf->nodename); |
691 | return r->si; |
741 | return r->si; |
692 | } |
742 | } |
693 | else |
743 | else |
694 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
744 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
695 | conf->nodename); |
745 | conf->nodename); |
696 | } |
746 | } |
697 | |
747 | |
698 | return si; |
748 | return si; |
699 | } |
749 | } |
… | |
… | |
709 | connection::send_ping (const sockinfo &si, u8 pong) |
759 | connection::send_ping (const sockinfo &si, u8 pong) |
710 | { |
760 | { |
711 | ping_packet *pkt = new ping_packet; |
761 | ping_packet *pkt = new ping_packet; |
712 | |
762 | |
713 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
763 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
764 | |
|
|
765 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
|
|
766 | |
714 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
767 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
715 | |
768 | |
716 | delete pkt; |
769 | delete pkt; |
717 | } |
770 | } |
718 | |
771 | |
… | |
… | |
737 | |
790 | |
738 | rsachallenge chg; |
791 | rsachallenge chg; |
739 | rsa_cache.gen (pkt->id, chg); |
792 | rsa_cache.gen (pkt->id, chg); |
740 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
793 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
741 | |
794 | |
742 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
795 | slog (L_TRACE, "%s >> PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
743 | |
796 | |
744 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
797 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
745 | |
798 | |
746 | delete pkt; |
799 | delete pkt; |
747 | } |
800 | } |
… | |
… | |
755 | |
808 | |
756 | rsa_hash (id, chg, pkt->response); |
809 | rsa_hash (id, chg, pkt->response); |
757 | |
810 | |
758 | pkt->hmac_set (octx); |
811 | pkt->hmac_set (octx); |
759 | |
812 | |
760 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
813 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
761 | |
814 | |
762 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
815 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
763 | |
816 | |
764 | delete pkt; |
817 | delete pkt; |
765 | } |
818 | } |
766 | |
819 | |
767 | void |
820 | void |
768 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
821 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
769 | { |
822 | { |
770 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
823 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename, |
771 | conf->id, rid, (const char *)rsi); |
824 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi); |
772 | |
825 | |
773 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
826 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
774 | |
827 | |
775 | r->hmac_set (octx); |
828 | r->hmac_set (octx); |
776 | send_vpn_packet (r, si); |
829 | send_vpn_packet (r, si); |
… | |
… | |
793 | { |
846 | { |
794 | reset_connection (); |
847 | reset_connection (); |
795 | return; |
848 | return; |
796 | } |
849 | } |
797 | |
850 | |
|
|
851 | last_establish_attempt = ev_now (); |
|
|
852 | |
798 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
853 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
799 | ? (retry_cnt & 3) + 1 |
854 | ? (retry_cnt & 3) + 1 |
800 | : 1 << (retry_cnt >> 2)); |
855 | : 1 << (retry_cnt >> 2)); |
801 | |
856 | |
802 | reset_si (); |
857 | reset_si (); |
803 | |
858 | |
804 | bool slow = si.prot & PROT_SLOW; |
859 | bool slow = si.prot & PROT_SLOW; |
805 | |
860 | |
806 | if (si.prot && !si.host) |
861 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
807 | { |
862 | { |
808 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
809 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
863 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
810 | w.start (1); |
864 | w.start (1); |
811 | vpn->send_connect_request (conf->id); |
865 | vpn->send_connect_request (this); |
812 | } |
866 | } |
813 | else |
867 | else |
814 | { |
868 | { |
815 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
869 | if (si.valid ()) |
|
|
870 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
871 | conf->nodename, (const char *)si); |
816 | |
872 | |
817 | const sockinfo &dsi = forward_si (si); |
873 | const sockinfo &dsi = forward_si (si); |
818 | |
874 | |
819 | slow = slow || (dsi.prot & PROT_SLOW); |
875 | slow = slow || (dsi.prot & PROT_SLOW); |
820 | |
876 | |
… | |
… | |
825 | else |
881 | else |
826 | send_ping (dsi, 0); |
882 | send_ping (dsi, 0); |
827 | } |
883 | } |
828 | } |
884 | } |
829 | |
885 | |
830 | retry_int *= slow ? 8. : 0.7; |
886 | retry_int *= slow ? 8. : 0.9; |
831 | |
887 | |
832 | if (retry_int < conf->max_retry) |
888 | if (retry_int < conf->max_retry) |
833 | retry_cnt++; |
889 | retry_cnt++; |
834 | else |
890 | else |
835 | retry_int = conf->max_retry; |
891 | retry_int = conf->max_retry; |
… | |
… | |
846 | slog (L_INFO, _("%s(%s): connection lost"), |
902 | slog (L_INFO, _("%s(%s): connection lost"), |
847 | conf->nodename, (const char *)si); |
903 | conf->nodename, (const char *)si); |
848 | |
904 | |
849 | if (::conf.script_node_down) |
905 | if (::conf.script_node_down) |
850 | { |
906 | { |
851 | run_script_cb cb; |
907 | run_script_cb *cb = new run_script_cb; |
852 | cb.set<connection, &connection::script_node_down> (this); |
908 | cb->set<connection, &connection::script_node_down> (this); |
853 | if (!run_script (cb, false)) |
|
|
854 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
909 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
855 | } |
910 | } |
856 | } |
911 | } |
857 | |
912 | |
858 | delete ictx; ictx = 0; |
913 | delete ictx; ictx = 0; |
859 | delete octx; octx = 0; |
914 | delete octx; octx = 0; |
… | |
… | |
861 | dnsv4_reset_connection (); |
916 | dnsv4_reset_connection (); |
862 | #endif |
917 | #endif |
863 | |
918 | |
864 | si.host = 0; |
919 | si.host = 0; |
865 | |
920 | |
866 | last_activity = 0; |
921 | last_activity = 0.; |
|
|
922 | //last_si_change = 0.; |
867 | retry_cnt = 0; |
923 | retry_cnt = 0; |
868 | |
924 | |
869 | rekey.stop (); |
925 | rekey.stop (); |
870 | keepalive.stop (); |
926 | keepalive.stop (); |
871 | establish_connection.stop (); |
927 | establish_connection.stop (); |
… | |
… | |
878 | send_reset (si); |
934 | send_reset (si); |
879 | |
935 | |
880 | reset_connection (); |
936 | reset_connection (); |
881 | } |
937 | } |
882 | |
938 | |
|
|
939 | // poor-man's rekeying |
883 | inline void |
940 | inline void |
884 | connection::rekey_cb (ev::timer &w, int revents) |
941 | connection::rekey_cb (ev::timer &w, int revents) |
885 | { |
942 | { |
886 | reset_connection (); |
943 | reset_connection (); |
887 | establish_connection (); |
944 | establish_connection (); |
… | |
… | |
905 | if (oseqno > MAX_SEQNO) |
962 | if (oseqno > MAX_SEQNO) |
906 | rekey (); |
963 | rekey (); |
907 | } |
964 | } |
908 | |
965 | |
909 | void |
966 | void |
|
|
967 | connection::post_inject_queue () |
|
|
968 | { |
|
|
969 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
970 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
971 | establish_connection.stop (); |
|
|
972 | |
|
|
973 | establish_connection (); |
|
|
974 | } |
|
|
975 | |
|
|
976 | void |
910 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
977 | connection::inject_data_packet (tap_packet *pkt) |
911 | { |
978 | { |
912 | if (ictx && octx) |
979 | if (ictx && octx) |
913 | send_data_packet (pkt); |
980 | send_data_packet (pkt); |
914 | else |
981 | else |
915 | { |
982 | { |
916 | if (!broadcast) |
|
|
917 | data_queue.put (new tap_packet (*pkt)); |
983 | data_queue.put (new tap_packet (*pkt)); |
918 | |
984 | post_inject_queue (); |
919 | establish_connection (); |
|
|
920 | } |
985 | } |
921 | } |
986 | } |
922 | |
987 | |
923 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
988 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
924 | { |
989 | { |
925 | if (ictx && octx) |
990 | if (ictx && octx) |
926 | send_vpn_packet (pkt, si, tos); |
991 | send_vpn_packet (pkt, si, tos); |
927 | else |
992 | else |
928 | { |
993 | { |
929 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
994 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
930 | |
995 | post_inject_queue (); |
931 | establish_connection (); |
|
|
932 | } |
996 | } |
933 | } |
997 | } |
934 | |
998 | |
935 | void |
999 | void |
936 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1000 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
937 | { |
1001 | { |
938 | last_activity = ev_now (); |
1002 | last_activity = ev_now (); |
939 | |
1003 | |
940 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1004 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
941 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1005 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
942 | |
1006 | |
943 | if (connectmode == conf_node::C_DISABLED) |
1007 | if (connectmode == conf_node::C_DISABLED) |
944 | return; |
1008 | return; |
945 | |
1009 | |
946 | switch (pkt->typ ()) |
1010 | switch (pkt->typ ()) |
947 | { |
1011 | { |
948 | case vpn_packet::PT_PING: |
1012 | case vpn_packet::PT_PING: |
|
|
1013 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1014 | |
949 | // we send pings instead of auth packets after some retries, |
1015 | // we send pings instead of auth packets after some retries, |
950 | // so reset the retry counter and establish a connection |
1016 | // so reset the retry counter and establish a connection |
951 | // when we receive a ping. |
1017 | // when we receive a ping. |
952 | if (!ictx) |
1018 | if (!ictx) |
953 | { |
1019 | { |
954 | if (auth_rate_limiter.can (rsi)) |
1020 | if (auth_rate_limiter.can (rsi)) |
955 | send_auth_request (rsi, true); |
1021 | send_auth_request (rsi, true); |
956 | } |
1022 | } |
957 | else |
1023 | else |
|
|
1024 | // we would love to change thre socket address here, but ping's aren't |
|
|
1025 | // authenticated, so we best ignore it. |
958 | send_ping (rsi, 1); // pong |
1026 | send_ping (rsi, 1); // pong |
959 | |
1027 | |
960 | break; |
1028 | break; |
961 | |
1029 | |
962 | case vpn_packet::PT_PONG: |
1030 | case vpn_packet::PT_PONG: |
|
|
1031 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
963 | break; |
1032 | break; |
964 | |
1033 | |
965 | case vpn_packet::PT_RESET: |
1034 | case vpn_packet::PT_RESET: |
966 | { |
1035 | { |
967 | reset_connection (); |
1036 | reset_connection (); |
968 | |
1037 | |
969 | config_packet *p = (config_packet *) pkt; |
1038 | config_packet *p = (config_packet *) pkt; |
970 | |
1039 | |
971 | if (!p->chk_config ()) |
1040 | if (!p->chk_config ()) |
972 | { |
1041 | { |
973 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1042 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
974 | conf->nodename, (const char *)rsi); |
1043 | conf->nodename, (const char *)rsi); |
975 | connectmode = conf_node::C_DISABLED; |
1044 | connectmode = conf_node::C_DISABLED; |
976 | } |
1045 | } |
977 | else if (connectmode == conf_node::C_ALWAYS) |
1046 | else if (connectmode == conf_node::C_ALWAYS) |
978 | establish_connection (); |
1047 | establish_connection (); |
… | |
… | |
982 | case vpn_packet::PT_AUTH_REQ: |
1051 | case vpn_packet::PT_AUTH_REQ: |
983 | if (auth_rate_limiter.can (rsi)) |
1052 | if (auth_rate_limiter.can (rsi)) |
984 | { |
1053 | { |
985 | auth_req_packet *p = (auth_req_packet *) pkt; |
1054 | auth_req_packet *p = (auth_req_packet *) pkt; |
986 | |
1055 | |
987 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1056 | slog (L_TRACE, "%s << PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply"); |
988 | |
1057 | |
989 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1058 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
990 | { |
1059 | { |
991 | if (p->prot_minor != PROTOCOL_MINOR) |
1060 | if (p->prot_minor != PROTOCOL_MINOR) |
992 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1061 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
1020 | |
1089 | |
1021 | break; |
1090 | break; |
1022 | } |
1091 | } |
1023 | } |
1092 | } |
1024 | else |
1093 | else |
1025 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1094 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
1026 | conf->nodename, (const char *)rsi); |
1095 | conf->nodename, (const char *)rsi); |
1027 | |
1096 | |
1028 | send_reset (rsi); |
1097 | send_reset (rsi); |
1029 | } |
1098 | } |
1030 | |
1099 | |
1031 | break; |
1100 | break; |
1032 | |
1101 | |
1033 | case vpn_packet::PT_AUTH_RES: |
1102 | case vpn_packet::PT_AUTH_RES: |
1034 | { |
1103 | { |
1035 | auth_res_packet *p = (auth_res_packet *) pkt; |
1104 | auth_res_packet *p = (auth_res_packet *)pkt; |
1036 | |
1105 | |
1037 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1106 | slog (L_TRACE, "%s << PT_AUTH_RES", conf->nodename); |
1038 | |
1107 | |
1039 | if (p->chk_config ()) |
1108 | if (p->chk_config ()) |
1040 | { |
1109 | { |
1041 | if (p->prot_minor != PROTOCOL_MINOR) |
1110 | if (p->prot_minor != PROTOCOL_MINOR) |
1042 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1111 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
1045 | |
1114 | |
1046 | rsachallenge chg; |
1115 | rsachallenge chg; |
1047 | |
1116 | |
1048 | if (!rsa_cache.find (p->id, chg)) |
1117 | if (!rsa_cache.find (p->id, chg)) |
1049 | { |
1118 | { |
1050 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1119 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
1051 | conf->nodename, (const char *)rsi); |
1120 | conf->nodename, (const char *)rsi); |
1052 | break; |
1121 | break; |
1053 | } |
1122 | } |
1054 | else |
1123 | else |
1055 | { |
1124 | { |
1056 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1125 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1057 | |
1126 | |
1058 | if (!p->hmac_chk (cctx)) |
1127 | if (!p->hmac_chk (cctx)) |
1059 | { |
1128 | { |
1060 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1129 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1061 | "could be an attack, or just corruption or a synchronization error"), |
1130 | "could be an attack, or just corruption or a synchronization error."), |
1062 | conf->nodename, (const char *)rsi); |
1131 | conf->nodename, (const char *)rsi); |
1063 | break; |
1132 | break; |
1064 | } |
1133 | } |
1065 | else |
1134 | else |
1066 | { |
1135 | { |
… | |
… | |
1077 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1146 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1078 | |
1147 | |
1079 | si = rsi; |
1148 | si = rsi; |
1080 | protocol = rsi.prot; |
1149 | protocol = rsi.prot; |
1081 | |
1150 | |
|
|
1151 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
1152 | conf->nodename, (const char *)rsi, |
|
|
1153 | is_direct ? "direct" : "routed", |
|
|
1154 | p->prot_major, p->prot_minor); |
|
|
1155 | |
1082 | connection_established (); |
1156 | connection_established (); |
1083 | |
|
|
1084 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1085 | conf->nodename, (const char *)rsi, |
|
|
1086 | p->prot_major, p->prot_minor); |
|
|
1087 | |
1157 | |
1088 | if (::conf.script_node_up) |
1158 | if (::conf.script_node_up) |
1089 | { |
1159 | { |
1090 | run_script_cb cb; |
1160 | run_script_cb *cb = new run_script_cb; |
1091 | cb.set<connection, &connection::script_node_up> (this); |
1161 | cb->set<connection, &connection::script_node_up> (this); |
1092 | if (!run_script (cb, false)) |
|
|
1093 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
1162 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
1094 | } |
1163 | } |
1095 | |
1164 | |
1096 | break; |
1165 | break; |
1097 | } |
1166 | } |
1098 | else |
1167 | else |
1099 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1168 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
1100 | conf->nodename, (const char *)rsi); |
1169 | conf->nodename, (const char *)rsi); |
1101 | } |
1170 | } |
1102 | |
1171 | |
1103 | delete cctx; |
1172 | delete cctx; |
1104 | } |
1173 | } |
… | |
… | |
1120 | { |
1189 | { |
1121 | vpndata_packet *p = (vpndata_packet *)pkt; |
1190 | vpndata_packet *p = (vpndata_packet *)pkt; |
1122 | |
1191 | |
1123 | if (!p->hmac_chk (ictx)) |
1192 | if (!p->hmac_chk (ictx)) |
1124 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1193 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1125 | "could be an attack, or just corruption or a synchronization error"), |
1194 | "could be an attack, or just corruption or a synchronization error."), |
1126 | conf->nodename, (const char *)rsi); |
1195 | conf->nodename, (const char *)rsi); |
1127 | else |
1196 | else |
1128 | { |
1197 | { |
1129 | u32 seqno; |
1198 | u32 seqno; |
1130 | tap_packet *d = p->unpack (this, seqno); |
1199 | tap_packet *d = p->unpack (this, seqno); |
|
|
1200 | int seqclass = iseqno.seqno_classify (seqno); |
1131 | |
1201 | |
1132 | if (iseqno.recv_ok (seqno)) |
1202 | if (seqclass == 0) // ok |
1133 | { |
1203 | { |
1134 | vpn->tap->send (d); |
1204 | vpn->tap->send (d); |
1135 | |
1205 | |
1136 | if (si != rsi) |
1206 | if (si != rsi) |
1137 | { |
1207 | { |
1138 | // fast re-sync on source address changes, useful especially for tcp/ip |
1208 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1209 | //if (last_si_change < ev_now () + 5.) |
1139 | si = rsi; |
1210 | // { |
1140 | |
|
|
1141 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1211 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1142 | conf->nodename, (const char *)si, (const char *)rsi); |
1212 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1213 | |
|
|
1214 | si = rsi; |
|
|
1215 | // } |
|
|
1216 | //else |
|
|
1217 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1218 | // conf->nodename, (const char *)si, (const char *)rsi); |
1143 | } |
1219 | } |
|
|
1220 | } |
|
|
1221 | else if (seqclass == 1) // far history |
|
|
1222 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1223 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1224 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1225 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1226 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1227 | else if (seqclass == 3) // reset |
|
|
1228 | { |
|
|
1229 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1230 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1231 | send_reset (rsi); |
1144 | } |
1232 | } |
1145 | |
1233 | |
1146 | delete d; |
1234 | delete d; |
1147 | break; |
1235 | break; |
1148 | } |
1236 | } |
… | |
… | |
1159 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1247 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1160 | { |
1248 | { |
1161 | connection *c = vpn->conns[p->id - 1]; |
1249 | connection *c = vpn->conns[p->id - 1]; |
1162 | conf->protocols = p->protocols; |
1250 | conf->protocols = p->protocols; |
1163 | |
1251 | |
1164 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
1252 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s) [%d]", |
1165 | conf->id, p->id, c->ictx && c->octx); |
1253 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx); |
1166 | |
1254 | |
1167 | if (c->ictx && c->octx) |
1255 | if (c->ictx && c->octx) |
1168 | { |
1256 | { |
1169 | // send connect_info packets to both sides, in case one is |
1257 | // send connect_info packets to both sides, in case one is |
1170 | // behind a nat firewall (or both ;) |
1258 | // behind a nat firewall (or both ;) |
… | |
… | |
1193 | |
1281 | |
1194 | c->conf->protocols = p->protocols; |
1282 | c->conf->protocols = p->protocols; |
1195 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1283 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1196 | p->si.upgrade_protocol (protocol, c->conf); |
1284 | p->si.upgrade_protocol (protocol, c->conf); |
1197 | |
1285 | |
1198 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1286 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s) [%d]", |
|
|
1287 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
1199 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1288 | (const char *)p->si, !c->ictx && !c->octx); |
1200 | |
1289 | |
1201 | const sockinfo &dsi = forward_si (p->si); |
1290 | const sockinfo &dsi = forward_si (p->si); |
1202 | |
1291 | |
1203 | if (dsi.valid ()) |
1292 | if (dsi.valid ()) |
1204 | c->send_auth_request (dsi, true); |
1293 | c->send_auth_request (dsi, true); |
… | |
… | |
1243 | |
1332 | |
1244 | void connection::send_connect_request (int id) |
1333 | void connection::send_connect_request (int id) |
1245 | { |
1334 | { |
1246 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1335 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1247 | |
1336 | |
1248 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1337 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s)", |
|
|
1338 | conf->nodename, vpn->conns[id - 1]->conf->nodename); |
1249 | p->hmac_set (octx); |
1339 | p->hmac_set (octx); |
1250 | send_vpn_packet (p, si); |
1340 | send_vpn_packet (p, si); |
1251 | |
1341 | |
1252 | delete p; |
1342 | delete p; |
1253 | } |
1343 | } |
… | |
… | |
1308 | connection::connection (struct vpn *vpn, conf_node *conf) |
1398 | connection::connection (struct vpn *vpn, conf_node *conf) |
1309 | : vpn(vpn), conf(conf), |
1399 | : vpn(vpn), conf(conf), |
1310 | #if ENABLE_DNS |
1400 | #if ENABLE_DNS |
1311 | dns (0), |
1401 | dns (0), |
1312 | #endif |
1402 | #endif |
1313 | data_queue(conf->max_ttl, conf->max_queue), |
1403 | data_queue(conf->max_ttl, conf->max_queue + 1), |
1314 | vpn_queue(conf->max_ttl, conf->max_queue) |
1404 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1315 | { |
1405 | { |
1316 | rekey .set<connection, &connection::rekey_cb > (this); |
1406 | rekey .set<connection, &connection::rekey_cb > (this); |
1317 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1407 | keepalive .set<connection, &connection::keepalive_cb > (this); |
1318 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1408 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
1319 | |
1409 | |
|
|
1410 | last_establish_attempt = 0.; |
1320 | octx = ictx = 0; |
1411 | octx = ictx = 0; |
1321 | retry_cnt = 0; |
|
|
1322 | |
1412 | |
1323 | if (!conf->protocols) // make sure some protocol is enabled |
1413 | if (!conf->protocols) // make sure some protocol is enabled |
1324 | conf->protocols = PROT_UDPv4; |
1414 | conf->protocols = PROT_UDPv4; |
1325 | |
1415 | |
1326 | connectmode = conf->connectmode; |
1416 | connectmode = conf->connectmode; |
1327 | |
1417 | |
1328 | // queue a dummy packet to force an initial connection attempt |
1418 | // queue a dummy packet to force an initial connection attempt |
1329 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1419 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
1330 | { |
1420 | vpn_queue.put (new net_packet); |
1331 | net_packet *p = new net_packet; |
|
|
1332 | p->len = 0; |
|
|
1333 | vpn_queue.put (p); |
|
|
1334 | } |
|
|
1335 | |
1421 | |
1336 | reset_connection (); |
1422 | reset_connection (); |
1337 | } |
1423 | } |
1338 | |
1424 | |
1339 | connection::~connection () |
1425 | connection::~connection () |