1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
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3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
20 | |
21 | |
21 | extern "C" { |
22 | extern "C" { |
22 | # include "lzf/lzf.h" |
23 | # include "lzf/lzf.h" |
23 | } |
24 | } |
24 | |
25 | |
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26 | #include <cassert> |
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27 | |
25 | #include <list> |
28 | #include <list> |
26 | |
29 | |
27 | #include <openssl/rand.h> |
30 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
31 | #include <openssl/evp.h> |
29 | #include <openssl/rsa.h> |
32 | #include <openssl/rsa.h> |
… | |
… | |
35 | #include "slog.h" |
38 | #include "slog.h" |
36 | #include "device.h" |
39 | #include "device.h" |
37 | #include "vpn.h" |
40 | #include "vpn.h" |
38 | #include "connection.h" |
41 | #include "connection.h" |
39 | |
42 | |
40 | #include <sys/socket.h> |
43 | #include "netcompat.h" |
41 | #ifdef HAVE_NETINET_IN_H |
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42 | # include <netinet/in.h> |
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43 | #endif |
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44 | #include <arpa/inet.h> |
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45 | #include <net/if.h> |
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46 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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47 | # include <netinet/in_systm.h> |
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48 | #endif |
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49 | #ifdef HAVE_NETINET_IP_H |
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50 | # include <netinet/ip.h> |
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51 | #endif |
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52 | |
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53 | #ifndef IPTOS_TOS_MASK |
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54 | # define IPTOS_TOS_MASK (IPTOS_LOWDELAY | IPTOS_THROUGHPUT | IPTOS_RELIABILITY | IPTOS_MINCOST) |
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55 | #endif |
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56 | |
44 | |
57 | #if !HAVE_RAND_PSEUDO_BYTES |
45 | #if !HAVE_RAND_PSEUDO_BYTES |
58 | # define RAND_pseudo_bytes RAND_bytes |
46 | # define RAND_pseudo_bytes RAND_bytes |
59 | #endif |
47 | #endif |
60 | |
48 | |
… | |
… | |
148 | |
136 | |
149 | } rsa_cache; |
137 | } rsa_cache; |
150 | |
138 | |
151 | void rsa_cache::cleaner_cb (time_watcher &w) |
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
152 | { |
140 | { |
153 | if (empty ()) |
141 | if (!empty ()) |
154 | w.at = TSTAMP_CANCEL; |
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155 | else |
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156 | { |
142 | { |
157 | w.at = NOW + RSA_TTL; |
143 | w.start (NOW + RSA_TTL); |
158 | |
144 | |
159 | for (iterator i = begin (); i != end (); ) |
145 | for (iterator i = begin (); i != end (); ) |
160 | if (i->expire <= NOW) |
146 | if (i->expire <= NOW) |
161 | i = erase (i); |
147 | i = erase (i); |
162 | else |
148 | else |
… | |
… | |
493 | } |
479 | } |
494 | |
480 | |
495 | bool config_packet::chk_config () const |
481 | bool config_packet::chk_config () const |
496 | { |
482 | { |
497 | if (prot_major != PROTOCOL_MAJOR) |
483 | if (prot_major != PROTOCOL_MAJOR) |
498 | slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); |
484 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
499 | else if (randsize != RAND_SIZE) |
485 | else if (randsize != RAND_SIZE) |
500 | slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); |
486 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
501 | else if (hmaclen != HMACLENGTH) |
487 | else if (hmaclen != HMACLENGTH) |
502 | slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
488 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
503 | else if (flags != curflags ()) |
489 | else if (flags != curflags ()) |
504 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
490 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
505 | else if (challengelen != sizeof (rsachallenge)) |
491 | else if (challengelen != sizeof (rsachallenge)) |
506 | slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); |
492 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
507 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
508 | slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
494 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
509 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
495 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
510 | slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
496 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
511 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
497 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
512 | slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
498 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
513 | else |
499 | else |
514 | return true; |
500 | return true; |
515 | |
501 | |
516 | return false; |
502 | return false; |
517 | } |
503 | } |
… | |
… | |
612 | } |
598 | } |
613 | else |
599 | else |
614 | { |
600 | { |
615 | retry_cnt = 0; |
601 | retry_cnt = 0; |
616 | establish_connection.start (NOW + 5); |
602 | establish_connection.start (NOW + 5); |
617 | keepalive.reset (); |
603 | keepalive.stop (); |
618 | rekey.reset (); |
604 | rekey.stop (); |
619 | } |
605 | } |
620 | } |
606 | } |
621 | |
607 | |
622 | void |
608 | void |
623 | connection::reset_si () |
609 | connection::reset_si () |
… | |
… | |
689 | connection::send_auth_request (const sockinfo &si, bool initiate) |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
690 | { |
676 | { |
691 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
677 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
692 | |
678 | |
693 | rsachallenge chg; |
679 | rsachallenge chg; |
694 | |
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695 | rsa_cache.gen (pkt->id, chg); |
680 | rsa_cache.gen (pkt->id, chg); |
696 | |
681 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
697 | if (0 > RSA_public_encrypt (sizeof chg, |
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698 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
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699 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
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700 | fatal ("RSA_public_encrypt error"); |
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701 | |
682 | |
702 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
683 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
703 | |
684 | |
704 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
685 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
705 | |
686 | |
… | |
… | |
739 | } |
720 | } |
740 | |
721 | |
741 | void |
722 | void |
742 | connection::establish_connection_cb (time_watcher &w) |
723 | connection::establish_connection_cb (time_watcher &w) |
743 | { |
724 | { |
744 | if (ictx || conf == THISNODE |
725 | if (!ictx |
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726 | && conf != THISNODE |
745 | || connectmode == conf_node::C_NEVER |
727 | && connectmode != conf_node::C_NEVER |
746 | || connectmode == conf_node::C_DISABLED) |
728 | && connectmode != conf_node::C_DISABLED |
747 | w.at = TSTAMP_CANCEL; |
729 | && NOW > w.at) |
748 | else if (w.at <= NOW) |
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749 | { |
730 | { |
750 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
731 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
751 | |
732 | |
752 | if (retry_int < 3600 * 8) |
733 | if (retry_int < 3600 * 8) |
753 | retry_cnt++; |
734 | retry_cnt++; |
754 | |
735 | |
755 | w.at = NOW + retry_int; |
736 | w.start (NOW + retry_int); |
756 | |
737 | |
757 | reset_si (); |
738 | reset_si (); |
758 | |
739 | |
759 | if (si.prot && !si.host) |
740 | if (si.prot && !si.host) |
760 | vpn->send_connect_request (conf->id); |
741 | vpn->send_connect_request (conf->id); |
… | |
… | |
791 | si.host= 0; |
772 | si.host= 0; |
792 | |
773 | |
793 | last_activity = 0; |
774 | last_activity = 0; |
794 | retry_cnt = 0; |
775 | retry_cnt = 0; |
795 | |
776 | |
796 | rekey.reset (); |
777 | rekey.stop (); |
797 | keepalive.reset (); |
778 | keepalive.stop (); |
798 | establish_connection.reset (); |
779 | establish_connection.stop (); |
799 | } |
780 | } |
800 | |
781 | |
801 | void |
782 | void |
802 | connection::shutdown () |
783 | connection::shutdown () |
803 | { |
784 | { |
… | |
… | |
808 | } |
789 | } |
809 | |
790 | |
810 | void |
791 | void |
811 | connection::rekey_cb (time_watcher &w) |
792 | connection::rekey_cb (time_watcher &w) |
812 | { |
793 | { |
813 | w.at = TSTAMP_CANCEL; |
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814 | |
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815 | reset_connection (); |
794 | reset_connection (); |
816 | establish_connection (); |
795 | establish_connection (); |
817 | } |
796 | } |
818 | |
797 | |
819 | void |
798 | void |
820 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
799 | connection::send_data_packet (tap_packet *pkt) |
821 | { |
800 | { |
822 | vpndata_packet *p = new vpndata_packet; |
801 | vpndata_packet *p = new vpndata_packet; |
823 | int tos = 0; |
802 | int tos = 0; |
824 | |
803 | |
825 | // I am not hilarious about peeking into packets, but so be it. |
804 | // I am not hilarious about peeking into packets, but so be it. |
826 | if (conf->inherit_tos |
805 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
827 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
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828 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
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829 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
806 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
830 | |
807 | |
831 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
808 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
832 | send_vpn_packet (p, si, tos); |
809 | send_vpn_packet (p, si, tos); |
833 | |
810 | |
834 | delete p; |
811 | delete p; |
835 | |
812 | |
836 | if (oseqno > MAX_SEQNO) |
813 | if (oseqno > MAX_SEQNO) |
837 | rekey (); |
814 | rekey (); |
838 | } |
815 | } |
839 | |
816 | |
840 | void |
817 | void |
841 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
818 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
842 | { |
819 | { |
843 | if (ictx && octx) |
820 | if (ictx && octx) |
844 | send_data_packet (pkt, broadcast); |
821 | send_data_packet (pkt); |
845 | else |
822 | else |
846 | { |
823 | { |
847 | if (!broadcast)//DDDD |
824 | if (!broadcast)//DDDD |
848 | data_queue.put (new tap_packet (*pkt)); |
825 | data_queue.put (new tap_packet (*pkt)); |
849 | |
826 | |
… | |
… | |
924 | if (p->initiate) |
901 | if (p->initiate) |
925 | send_auth_request (rsi, false); |
902 | send_auth_request (rsi, false); |
926 | |
903 | |
927 | rsachallenge k; |
904 | rsachallenge k; |
928 | |
905 | |
929 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
906 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
930 | (unsigned char *)&p->encr, (unsigned char *)&k, |
907 | { |
931 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
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932 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
908 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
933 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
909 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
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910 | break; |
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911 | } |
934 | else |
912 | else |
935 | { |
913 | { |
936 | delete octx; |
914 | delete octx; |
937 | |
915 | |
938 | octx = new crypto_ctx (k, 1); |
916 | octx = new crypto_ctx (k, 1); |
… | |
… | |
1052 | |
1030 | |
1053 | if (iseqno.recv_ok (seqno)) |
1031 | if (iseqno.recv_ok (seqno)) |
1054 | { |
1032 | { |
1055 | vpn->tap->send (d); |
1033 | vpn->tap->send (d); |
1056 | |
1034 | |
1057 | if (p->dst () == 0) // re-broadcast |
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1058 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
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1059 | { |
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1060 | connection *c = *i; |
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1061 | |
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1062 | if (c->conf != THISNODE && c->conf != conf) |
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1063 | c->inject_data_packet (d); |
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1064 | } |
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1065 | |
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1066 | if (si != rsi) |
1035 | if (si != rsi) |
1067 | { |
1036 | { |
1068 | // fast re-sync on connection changes, useful especially for tcp/ip |
1037 | // fast re-sync on connection changes, useful especially for tcp/ip |
1069 | si = rsi; |
1038 | si = rsi; |
1070 | |
1039 | |
… | |
… | |
1143 | { |
1112 | { |
1144 | reset_connection (); |
1113 | reset_connection (); |
1145 | establish_connection (); |
1114 | establish_connection (); |
1146 | } |
1115 | } |
1147 | else if (NOW < last_activity + ::conf.keepalive) |
1116 | else if (NOW < last_activity + ::conf.keepalive) |
1148 | w.at = last_activity + ::conf.keepalive; |
1117 | w.start (last_activity + ::conf.keepalive); |
1149 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1118 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1150 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1119 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1151 | { |
1120 | { |
1152 | send_ping (si); |
1121 | send_ping (si); |
1153 | w.at = NOW + 5; |
1122 | w.start (NOW + 5); |
1154 | } |
1123 | } |
1155 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1124 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1156 | // hold ondemand connections implicitly a few seconds longer |
1125 | // hold ondemand connections implicitly a few seconds longer |
1157 | // should delete octx, though, or something like that ;) |
1126 | // should delete octx, though, or something like that ;) |
1158 | w.at = last_activity + ::conf.keepalive + 10; |
1127 | w.start (last_activity + ::conf.keepalive + 10); |
1159 | else |
1128 | else |
1160 | reset_connection (); |
1129 | reset_connection (); |
1161 | } |
1130 | } |
1162 | |
1131 | |
1163 | void connection::send_connect_request (int id) |
1132 | void connection::send_connect_request (int id) |