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Comparing gvpe/src/connection.C (file contents):
Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC vs.
Revision 1.57 by pcg, Thu Jul 7 14:41:51 2005 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> 3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE.
6
5 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by 8 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 2 of the License, or 9 the Free Software Foundation; either version 2 of the License, or
8 (at your option) any later version. 10 (at your option) any later version.
9 11
10 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,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details. 15 GNU General Public License for more details.
14 16
15 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
16 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18*/ 20*/
19 21
20#include "config.h" 22#include "config.h"
21
22#include <cassert>
23 23
24#include <list> 24#include <list>
25 25
26#include <openssl/rand.h> 26#include <openssl/rand.h>
27#include <openssl/evp.h> 27#include <openssl/evp.h>
28#include <openssl/rsa.h> 28#include <openssl/rsa.h>
29#include <openssl/err.h> 29#include <openssl/err.h>
30
31#include "gettext.h"
32 30
33#include "conf.h" 31#include "conf.h"
34#include "slog.h" 32#include "slog.h"
35#include "device.h" 33#include "device.h"
36#include "vpn.h" 34#include "vpn.h"
… …
95struct rsa_cache : list<rsa_entry> 93struct rsa_cache : list<rsa_entry>
96{ 94{
97 void cleaner_cb (time_watcher &w); time_watcher cleaner; 95 void cleaner_cb (time_watcher &w); time_watcher cleaner;
98 96
99 bool find (const rsaid &id, rsachallenge &chg) 97 bool find (const rsaid &id, rsachallenge &chg)
100 { 98 {
101 for (iterator i = begin (); i != end (); ++i) 99 for (iterator i = begin (); i != end (); ++i)
102 { 100 {
103 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 101 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104 { 102 {
105 memcpy (&chg, &i->chg, sizeof chg); 103 memcpy (&chg, &i->chg, sizeof chg);
106 104
107 erase (i); 105 erase (i);
108 return true; 106 return true;
109 } 107 }
110 } 108 }
111 109
112 if (cleaner.at < NOW) 110 if (cleaner.at < NOW)
113 cleaner.start (NOW + RSA_TTL); 111 cleaner.start (NOW + RSA_TTL);
114 112
115 return false; 113 return false;
116 } 114 }
117 115
118 void gen (rsaid &id, rsachallenge &chg) 116 void gen (rsaid &id, rsachallenge &chg)
119 { 117 {
120 rsa_entry e; 118 rsa_entry e;
121 119
122 RAND_bytes ((unsigned char *)&id, sizeof id); 120 RAND_bytes ((unsigned char *)&id, sizeof id);
123 RAND_bytes ((unsigned char *)&chg, sizeof chg); 121 RAND_bytes ((unsigned char *)&chg, sizeof chg);
124 122
125 e.expire = NOW + RSA_TTL; 123 e.expire = NOW + RSA_TTL;
126 e.id = id; 124 e.id = id;
127 memcpy (&e.chg, &chg, sizeof chg); 125 memcpy (&e.chg, &chg, sizeof chg);
128 126
129 push_back (e); 127 push_back (e);
130 128
131 if (cleaner.at < NOW) 129 if (cleaner.at < NOW)
132 cleaner.start (NOW + RSA_TTL); 130 cleaner.start (NOW + RSA_TTL);
133 } 131 }
134 132
135 rsa_cache () 133 rsa_cache ()
136 : cleaner (this, &rsa_cache::cleaner_cb) 134 : cleaner (this, &rsa_cache::cleaner_cb)
137 { } 135 { }
138 136
139} rsa_cache; 137} rsa_cache;
140 138
141void rsa_cache::cleaner_cb (time_watcher &w) 139void rsa_cache::cleaner_cb (time_watcher &w)
142{ 140{
… …
476{ 474{
477 prot_major = PROTOCOL_MAJOR; 475 prot_major = PROTOCOL_MAJOR;
478 prot_minor = PROTOCOL_MINOR; 476 prot_minor = PROTOCOL_MINOR;
479 randsize = RAND_SIZE; 477 randsize = RAND_SIZE;
480 hmaclen = HMACLENGTH; 478 hmaclen = HMACLENGTH;
481 flags = ENABLE_COMPRESSION ? 0x81 : 0x80; 479 flags = 0;
482 challengelen = sizeof (rsachallenge); 480 challengelen = sizeof (rsachallenge);
483 features = get_features (); 481 features = get_features ();
484 482
485 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 483 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
486 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 484 digest_nid = htonl (EVP_MD_type (RSA_HASH));
… …
496 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 494 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
497 else if (randsize != RAND_SIZE) 495 else if (randsize != RAND_SIZE)
498 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 496 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
499 else if (hmaclen != HMACLENGTH) 497 else if (hmaclen != HMACLENGTH)
500 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); 498 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501#if 0 // this implementation should handle all flag settings
502 else if (flags != curflags ())
503 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504#endif
505 else if (challengelen != sizeof (rsachallenge)) 499 else if (challengelen != sizeof (rsachallenge))
506 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); 500 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 501 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
508 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 502 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))) 503 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
… …
642 { 636 {
643 connection *r = vpn->find_router (); 637 connection *r = vpn->find_router ();
644 638
645 if (r) 639 if (r)
646 { 640 {
647 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 641 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
648 conf->nodename, r->conf->nodename); 642 conf->nodename, r->conf->nodename, (const char *)r->si);
649 return r->si; 643 return r->si;
650 } 644 }
651 else 645 else
652 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 646 slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
653 conf->nodename); 647 conf->nodename);
… …
657} 651}
658 652
659void 653void
660connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 654connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
661{ 655{
662 bool ok; 656 if (!vpn->send_vpn_packet (pkt, si, tos))
663
664 switch (si.prot)
665 {
666 case PROT_IPv4:
667 ok = vpn->send_ipv4_packet (pkt, si, tos); break;
668 case PROT_UDPv4:
669 ok = vpn->send_udpv4_packet (pkt, si, tos); break;
670#if ENABLE_TCP
671 case PROT_TCPv4:
672 ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
673#endif
674#if ENABLE_ICMP
675 case PROT_ICMPv4:
676 ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
677#endif
678#if ENABLE_DNS
679 case PROT_DNSv4:
680 ok = send_dnsv4_packet (pkt, si, tos); break;
681#endif
682
683 default:
684 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
685 ok = false;
686 }
687
688 if (!ok)
689 reset_connection (); 657 reset_connection ();
690} 658}
691 659
692void 660void
693connection::send_ping (const sockinfo &si, u8 pong) 661connection::send_ping (const sockinfo &si, u8 pong)
… …
769 && conf != THISNODE 737 && conf != THISNODE
770 && connectmode != conf_node::C_NEVER 738 && connectmode != conf_node::C_NEVER
771 && connectmode != conf_node::C_DISABLED 739 && connectmode != conf_node::C_DISABLED
772 && NOW > w.at) 740 && NOW > w.at)
773 { 741 {
774 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 742 w.at = TSTAMP_MAX; // first disable this watcher in case of recursion
775 743
776 if (retry_int < conf->max_retry) 744 double retry_int = double (retry_cnt & 3
777 retry_cnt++; 745 ? (retry_cnt & 3) + 1
778 else 746 : 1 << (retry_cnt >> 2));
779 retry_int = conf->max_retry;
780
781 w.start (NOW + retry_int);
782 747
783 reset_si (); 748 reset_si ();
749
750 bool slow = si.prot & PROT_SLOW;
784 751
785 if (si.prot && !si.host) 752 if (si.prot && !si.host)
786 vpn->send_connect_request (conf->id); 753 vpn->send_connect_request (conf->id);
787 else 754 else
788 { 755 {
789 const sockinfo &dsi = forward_si (si); 756 const sockinfo &dsi = forward_si (si);
757
758 slow = slow || (dsi.prot & PROT_SLOW);
790 759
791 if (dsi.valid () && auth_rate_limiter.can (dsi)) 760 if (dsi.valid () && auth_rate_limiter.can (dsi))
792 { 761 {
793 if (retry_cnt < 4) 762 if (retry_cnt < 4)
794 send_auth_request (dsi, true); 763 send_auth_request (dsi, true);
795 else 764 else
796 send_ping (dsi, 0); 765 send_ping (dsi, 0);
797 } 766 }
798 } 767 }
768
769 retry_int *= slow ? 8. : 0.7;
770
771 if (retry_int < conf->max_retry)
772 retry_cnt++;
773 else
774 retry_int = conf->max_retry;
775
776 w.start (NOW + retry_int);
799 } 777 }
800} 778}
801 779
802void 780void
803connection::reset_connection () 781connection::reset_connection ()
… …
806 { 784 {
807 slog (L_INFO, _("%s(%s): connection lost"), 785 slog (L_INFO, _("%s(%s): connection lost"),
808 conf->nodename, (const char *)si); 786 conf->nodename, (const char *)si);
809 787
810 if (::conf.script_node_down) 788 if (::conf.script_node_down)
811 run_script (run_script_cb (this, &connection::script_node_down), false); 789 if (!run_script (run_script_cb (this, &connection::script_node_down), false))
790 slog (L_WARN, _("node-down command execution failed, continuing."));
812 } 791 }
813 792
814 delete ictx; ictx = 0; 793 delete ictx; ictx = 0;
815 delete octx; octx = 0; 794 delete octx; octx = 0;
795#if ENABLE_DNS
796 dnsv4_reset_connection ();
797#endif
816 798
817 si.host = 0; 799 si.host = 0;
818 800
819 last_activity = 0; 801 last_activity = 0;
820 retry_cnt = 0; 802 retry_cnt = 0;
… …
864{ 846{
865 if (ictx && octx) 847 if (ictx && octx)
866 send_data_packet (pkt); 848 send_data_packet (pkt);
867 else 849 else
868 { 850 {
869 if (!broadcast)//DDDD 851 if (!broadcast)
870 data_queue.put (new tap_packet (*pkt)); 852 data_queue.put (new tap_packet (*pkt));
871 853
872 establish_connection (); 854 establish_connection ();
873 } 855 }
874} 856}
… …
959 delete octx; 941 delete octx;
960 942
961 octx = new crypto_ctx (k, 1); 943 octx = new crypto_ctx (k, 1);
962 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 944 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
963 945
964 // compatibility code, remove when no longer required
965 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
966
967 conf->protocols = p->protocols; 946 conf->protocols = p->protocols;
968 features = p->features & config_packet::get_features (); 947 features = p->features & config_packet::get_features ();
969 948
970 send_auth_response (rsi, p->id, k); 949 send_auth_response (rsi, p->id, k);
971 950
… …
1037 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), 1016 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1038 conf->nodename, (const char *)rsi, 1017 conf->nodename, (const char *)rsi,
1039 p->prot_major, p->prot_minor); 1018 p->prot_major, p->prot_minor);
1040 1019
1041 if (::conf.script_node_up) 1020 if (::conf.script_node_up)
1042 run_script (run_script_cb (this, &connection::script_node_up), false); 1021 if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1022 slog (L_WARN, _("node-up command execution failed, continuing."));
1043 1023
1044 break; 1024 break;
1045 } 1025 }
1046 else 1026 else
1047 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1027 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
… …
1081 { 1061 {
1082 vpn->tap->send (d); 1062 vpn->tap->send (d);
1083 1063
1084 if (si != rsi) 1064 if (si != rsi)
1085 { 1065 {
1086 // fast re-sync on connection changes, useful especially for tcp/ip 1066 // fast re-sync on source address changes, useful especially for tcp/ip
1087 si = rsi; 1067 si = rsi;
1088 1068
1089 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1069 slog (L_INFO, _("%s(%s): socket address changed to %s"),
1090 conf->nodename, (const char *)si, (const char *)rsi); 1070 conf->nodename, (const char *)si, (const char *)rsi);
1091 } 1071 }
… …
1102 case vpn_packet::PT_CONNECT_REQ: 1082 case vpn_packet::PT_CONNECT_REQ:
1103 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1083 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1104 { 1084 {
1105 connect_req_packet *p = (connect_req_packet *) pkt; 1085 connect_req_packet *p = (connect_req_packet *) pkt;
1106 1086
1107 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1087 if (p->id > 0 && p->id <= vpn->conns.size ())
1108 connection *c = vpn->conns[p->id - 1];
1109 conf->protocols = p->protocols;
1110
1111 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1112 conf->id, p->id, c->ictx && c->octx);
1113
1114 if (c->ictx && c->octx)
1115 { 1088 {
1089 connection *c = vpn->conns[p->id - 1];
1090 conf->protocols = p->protocols;
1091
1092 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1093 conf->id, p->id, c->ictx && c->octx);
1094
1095 if (c->ictx && c->octx)
1096 {
1116 // send connect_info packets to both sides, in case one is 1097 // send connect_info packets to both sides, in case one is
1117 // behind a nat firewall (or both ;) 1098 // behind a nat firewall (or both ;)
1118 c->send_connect_info (conf->id, si, conf->protocols); 1099 c->send_connect_info (conf->id, si, conf->protocols);
1119 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1100 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1101 }
1102 else
1103 c->establish_connection ();
1120 } 1104 }
1121 else 1105 else
1122 c->establish_connection (); 1106 slog (L_WARN,
1107 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1108 p->id);
1123 } 1109 }
1124 1110
1125 break; 1111 break;
1126 1112
1127 case vpn_packet::PT_CONNECT_INFO: 1113 case vpn_packet::PT_CONNECT_INFO:
1128 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1114 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1129 { 1115 {
1130 connect_info_packet *p = (connect_info_packet *)pkt; 1116 connect_info_packet *p = (connect_info_packet *)pkt;
1131 1117
1132 if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything 1118 if (p->id > 0 && p->id <= vpn->conns.size ())
1133 { 1119 {
1134 connection *c = vpn->conns[p->id - 1]; 1120 connection *c = vpn->conns[p->id - 1];
1135 1121
1136 c->conf->protocols = p->protocols; 1122 c->conf->protocols = p->protocols;
1137 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1123 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
… …
1143 const sockinfo &dsi = forward_si (p->si); 1129 const sockinfo &dsi = forward_si (p->si);
1144 1130
1145 if (dsi.valid ()) 1131 if (dsi.valid ())
1146 c->send_auth_request (dsi, true); 1132 c->send_auth_request (dsi, true);
1147 } 1133 }
1134 else
1135 slog (L_WARN,
1136 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1137 p->id);
1148 } 1138 }
1149 1139
1150 break; 1140 break;
1151 1141
1152 default: 1142 default:
… …
1187 send_vpn_packet (p, si); 1177 send_vpn_packet (p, si);
1188 1178
1189 delete p; 1179 delete p;
1190} 1180}
1191 1181
1182void connection::script_init_env (const char *ext)
1183{
1184 char *env;
1185 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1186 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1187 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1188 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1189 conf->id & 0xff); putenv (env);
1190}
1191
1192void connection::script_node () 1192void connection::script_init_connect_env ()
1193{ 1193{
1194 vpn->script_if_up (); 1194 vpn->script_init_env ();
1195 1195
1196 char *env; 1196 char *env;
1197 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1197 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1198 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1198 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1199 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1200 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201} 1201}
1202 1202
1203const char *connection::script_node_up () 1203const char *connection::script_node_up ()
1204{ 1204{
1205 script_node (); 1205 script_init_connect_env ();
1206 1206
1207 putenv ("STATE=up"); 1207 putenv ("STATE=up");
1208 1208
1209 char *filename;
1210 asprintf (&filename,
1211 "%s/%s",
1212 confbase,
1209 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1213 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1214
1215 return filename;
1210} 1216}
1211 1217
1212const char *connection::script_node_down () 1218const char *connection::script_node_down ()
1213{ 1219{
1214 script_node (); 1220 script_init_connect_env ();
1215 1221
1216 putenv ("STATE=down"); 1222 putenv ("STATE=down");
1217 1223
1218 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1224 char *filename;
1225 asprintf (&filename,
1226 "%s/%s",
1227 confbase,
1228 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1229
1230 return filename;
1219} 1231}
1220 1232
1221connection::connection (struct vpn *vpn, conf_node *conf) 1233connection::connection (struct vpn *vpn, conf_node *conf)
1222: vpn(vpn), conf(conf) 1234: vpn(vpn), conf(conf)
1223, rekey (this, &connection::rekey_cb) 1235, rekey (this, &connection::rekey_cb)
1224, keepalive (this, &connection::keepalive_cb) 1236, keepalive (this, &connection::keepalive_cb)
1225, establish_connection (this, &connection::establish_connection_cb) 1237, establish_connection (this, &connection::establish_connection_cb)
1226#if ENABLE_DNS 1238#if ENABLE_DNS
1227, dnsv4_tw (this, &connection::dnsv4_cb) 1239, dns (0)
1228, dns_rcvdq (0), dns_snddq (0)
1229, dns_rcvseq (0), dns_sndseq (0)
1230#endif 1240#endif
1231{ 1241{
1232 octx = ictx = 0; 1242 octx = ictx = 0;
1233 retry_cnt = 0; 1243 retry_cnt = 0;
1234 1244

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