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Comparing gvpe/src/connection.C (file contents):
Revision 1.17 by pcg, Mon Sep 1 21:23:35 2003 UTC vs.
Revision 1.28 by pcg, Tue Jan 27 05:56:35 2004 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 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
21extern "C" { 22extern "C" {
22# include "lzf/lzf.h" 23# include "lzf/lzf.h"
23} 24}
24 25
26#include <cassert>
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>
… …
34#include "conf.h" 37#include "conf.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"
42
43#include "netcompat.h"
39 44
40#if !HAVE_RAND_PSEUDO_BYTES 45#if !HAVE_RAND_PSEUDO_BYTES
41# define RAND_pseudo_bytes RAND_bytes 46# define RAND_pseudo_bytes RAND_bytes
42#endif 47#endif
43 48
… …
131 136
132} rsa_cache; 137} rsa_cache;
133 138
134void rsa_cache::cleaner_cb (time_watcher &w) 139void rsa_cache::cleaner_cb (time_watcher &w)
135{ 140{
136 if (empty ()) 141 if (!empty ())
137 w.at = TSTAMP_CANCEL;
138 else
139 { 142 {
140 w.at = NOW + RSA_TTL; 143 w.start (NOW + RSA_TTL);
141 144
142 for (iterator i = begin (); i != end (); ) 145 for (iterator i = begin (); i != end (); )
143 if (i->expire <= NOW) 146 if (i->expire <= NOW)
144 i = erase (i); 147 i = erase (i);
145 else 148 else
… …
307} 310}
308 311
309#define MAXVPNDATA (MAX_MTU - 6 - 6) 312#define MAXVPNDATA (MAX_MTU - 6 - 6)
310#define DATAHDR (sizeof (u32) + RAND_SIZE) 313#define DATAHDR (sizeof (u32) + RAND_SIZE)
311 314
312struct vpndata_packet:vpn_packet 315struct vpndata_packet : vpn_packet
313 { 316 {
314 u8 data[MAXVPNDATA + DATAHDR]; // seqno 317 u8 data[MAXVPNDATA + DATAHDR]; // seqno
315 318
316 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); 319 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
317 tap_packet *unpack (connection *conn, u32 &seqno); 320 tap_packet *unpack (connection *conn, u32 &seqno);
… …
476} 479}
477 480
478bool config_packet::chk_config () const 481bool config_packet::chk_config () const
479{ 482{
480 if (prot_major != PROTOCOL_MAJOR) 483 if (prot_major != PROTOCOL_MAJOR)
481 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);
482 else if (randsize != RAND_SIZE) 485 else if (randsize != RAND_SIZE)
483 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);
484 else if (hmaclen != HMACLENGTH) 487 else if (hmaclen != HMACLENGTH)
485 slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); 488 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
486 else if (flags != curflags ()) 489 else if (flags != curflags ())
487 slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); 490 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
488 else if (challengelen != sizeof (rsachallenge)) 491 else if (challengelen != sizeof (rsachallenge))
489 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));
490 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 493 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
491 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));
492 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 495 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
493 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));
494 else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) 497 else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
495 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));
496 else 499 else
497 return true; 500 return true;
498 501
499 return false; 502 return false;
500} 503}
501 504
502struct auth_req_packet : config_packet 505struct auth_req_packet : config_packet
503{ 506{
504 char magic[8]; 507 char magic[8];
505 u8 initiate; // false if this is just an automatic reply 508 u8 initiate; // false if this is just an automatic reply
506 u8 protocols; // supported protocols (will get patches on forward) 509 u8 protocols; // supported protocols (will be patched on forward)
507 u8 pad2, pad3; 510 u8 pad2, pad3;
508 rsaid id; 511 rsaid id;
509 rsaencrdata encr; 512 rsaencrdata encr;
510 513
511 auth_req_packet (int dst, bool initiate_, u8 protocols_) 514 auth_req_packet (int dst, bool initiate_, u8 protocols_)
… …
595 } 598 }
596 else 599 else
597 { 600 {
598 retry_cnt = 0; 601 retry_cnt = 0;
599 establish_connection.start (NOW + 5); 602 establish_connection.start (NOW + 5);
600 keepalive.reset (); 603 keepalive.stop ();
601 rekey.reset (); 604 rekey.stop ();
602 } 605 }
603} 606}
604 607
605void 608void
606connection::reset_si () 609connection::reset_si ()
… …
672connection::send_auth_request (const sockinfo &si, bool initiate) 675connection::send_auth_request (const sockinfo &si, bool initiate)
673{ 676{
674 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);
675 678
676 rsachallenge chg; 679 rsachallenge chg;
677
678 rsa_cache.gen (pkt->id, chg); 680 rsa_cache.gen (pkt->id, chg);
679 681 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
680 if (0 > RSA_public_encrypt (sizeof chg,
681 (unsigned char *)&chg, (unsigned char *)&pkt->encr,
682 conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
683 fatal ("RSA_public_encrypt error");
684 682
685 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);
686 684
687 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
688 686
… …
722} 720}
723 721
724void 722void
725connection::establish_connection_cb (time_watcher &w) 723connection::establish_connection_cb (time_watcher &w)
726{ 724{
727 if (ictx || conf == THISNODE 725 if (!ictx
726 && conf != THISNODE
728 || connectmode == conf_node::C_NEVER 727 && connectmode != conf_node::C_NEVER
729 || connectmode == conf_node::C_DISABLED) 728 && connectmode != conf_node::C_DISABLED
730 w.at = TSTAMP_CANCEL; 729 && NOW > w.at)
731 else if (w.at <= NOW)
732 { 730 {
733 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;
734 732
735 if (retry_int < 3600 * 8) 733 if (retry_int < 3600 * 8)
736 retry_cnt++; 734 retry_cnt++;
737 735
738 w.at = NOW + retry_int; 736 w.start (NOW + retry_int);
739 737
740 reset_si (); 738 reset_si ();
741 739
742 if (si.prot && !si.host) 740 if (si.prot && !si.host)
743 vpn->send_connect_request (conf->id); 741 vpn->send_connect_request (conf->id);
… …
774 si.host= 0; 772 si.host= 0;
775 773
776 last_activity = 0; 774 last_activity = 0;
777 retry_cnt = 0; 775 retry_cnt = 0;
778 776
779 rekey.reset (); 777 rekey.stop ();
780 keepalive.reset (); 778 keepalive.stop ();
781 establish_connection.reset (); 779 establish_connection.stop ();
782} 780}
783 781
784void 782void
785connection::shutdown () 783connection::shutdown ()
786{ 784{
… …
791} 789}
792 790
793void 791void
794connection::rekey_cb (time_watcher &w) 792connection::rekey_cb (time_watcher &w)
795{ 793{
796 w.at = TSTAMP_CANCEL;
797
798 reset_connection (); 794 reset_connection ();
799 establish_connection (); 795 establish_connection ();
800} 796}
801 797
802void 798void
803connection::send_data_packet (tap_packet *pkt, bool broadcast) 799connection::send_data_packet (tap_packet *pkt)
804{ 800{
805 vpndata_packet *p = new vpndata_packet; 801 vpndata_packet *p = new vpndata_packet;
806 int tos = 0; 802 int tos = 0;
807 803
808 // 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.
809 if (conf->inherit_tos 805 if (conf->inherit_tos && pkt->is_ipv4 ())
810 && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
811 && ((*pkt)[14] & 0xf0) == 0x40) // IPv4
812 tos = (*pkt)[15] & IPTOS_TOS_MASK; 806 tos = (*pkt)[15] & IPTOS_TOS_MASK;
813 807
814 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
815 send_vpn_packet (p, si, tos); 809 send_vpn_packet (p, si, tos);
816 810
817 delete p; 811 delete p;
818 812
819 if (oseqno > MAX_SEQNO) 813 if (oseqno > MAX_SEQNO)
820 rekey (); 814 rekey ();
821} 815}
822 816
823void 817void
824connection::inject_data_packet (tap_packet *pkt, bool broadcast) 818connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)
825{ 819{
826 if (ictx && octx) 820 if (ictx && octx)
827 send_data_packet (pkt, broadcast); 821 send_data_packet (pkt);
828 else 822 else
829 { 823 {
830 if (!broadcast)//DDDD 824 if (!broadcast)//DDDD
831 data_queue.put (new tap_packet (*pkt)); 825 data_queue.put (new tap_packet (*pkt));
832 826
… …
838{ 832{
839 if (ictx && octx) 833 if (ictx && octx)
840 send_vpn_packet (pkt, si, tos); 834 send_vpn_packet (pkt, si, tos);
841 else 835 else
842 { 836 {
843 vpn_queue.put (new vpn_packet (*pkt)); 837 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
844 838
845 establish_connection (); 839 establish_connection ();
846 } 840 }
847} 841}
848 842
… …
907 if (p->initiate) 901 if (p->initiate)
908 send_auth_request (rsi, false); 902 send_auth_request (rsi, false);
909 903
910 rsachallenge k; 904 rsachallenge k;
911 905
912 if (0 > RSA_private_decrypt (sizeof (p->encr), 906 if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
913 (unsigned char *)&p->encr, (unsigned char *)&k, 907 {
914 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915 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?"),
916 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));
910 break;
911 }
917 else 912 else
918 { 913 {
919 delete octx; 914 delete octx;
920 915
921 octx = new crypto_ctx (k, 1); 916 octx = new crypto_ctx (k, 1);
… …
954 949
955 rsachallenge chg; 950 rsachallenge chg;
956 951
957 if (!rsa_cache.find (p->id, chg)) 952 if (!rsa_cache.find (p->id, chg))
958 { 953 {
959 slog (L_ERR, _("%s(%s): unrequested auth response"), 954 slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
960 conf->nodename, (const char *)rsi); 955 conf->nodename, (const char *)rsi);
961 break; 956 break;
962 } 957 }
963 else 958 else
964 { 959 {
965 crypto_ctx *cctx = new crypto_ctx (chg, 0); 960 crypto_ctx *cctx = new crypto_ctx (chg, 0);
966 961
967 if (!p->hmac_chk (cctx)) 962 if (!p->hmac_chk (cctx))
963 {
968 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 964 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
969 "could be an attack, or just corruption or an synchronization error"), 965 "could be an attack, or just corruption or a synchronization error"),
970 conf->nodename, (const char *)rsi); 966 conf->nodename, (const char *)rsi);
967 break;
968 }
971 else 969 else
972 { 970 {
973 rsaresponse h; 971 rsaresponse h;
974 972
975 rsa_hash (p->id, chg, h); 973 rsa_hash (p->id, chg, h);
… …
1021 { 1019 {
1022 vpndata_packet *p = (vpndata_packet *)pkt; 1020 vpndata_packet *p = (vpndata_packet *)pkt;
1023 1021
1024 if (!p->hmac_chk (ictx)) 1022 if (!p->hmac_chk (ictx))
1025 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1023 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026 "could be an attack, or just corruption or an synchronization error"), 1024 "could be an attack, or just corruption or a synchronization error"),
1027 conf->nodename, (const char *)rsi); 1025 conf->nodename, (const char *)rsi);
1028 else 1026 else
1029 { 1027 {
1030 u32 seqno; 1028 u32 seqno;
1031 tap_packet *d = p->unpack (this, seqno); 1029 tap_packet *d = p->unpack (this, seqno);
1032 1030
1033 if (iseqno.recv_ok (seqno)) 1031 if (iseqno.recv_ok (seqno))
1034 { 1032 {
1035 vpn->tap->send (d); 1033 vpn->tap->send (d);
1036
1037 if (p->dst () == 0) // re-broadcast
1038 for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1039 {
1040 connection *c = *i;
1041
1042 if (c->conf != THISNODE && c->conf != conf)
1043 c->inject_data_packet (d);
1044 }
1045 1034
1046 if (si != rsi) 1035 if (si != rsi)
1047 { 1036 {
1048 // fast re-sync on connection changes, useful especially for tcp/ip 1037 // fast re-sync on connection changes, useful especially for tcp/ip
1049 si = rsi; 1038 si = rsi;
… …
1123 { 1112 {
1124 reset_connection (); 1113 reset_connection ();
1125 establish_connection (); 1114 establish_connection ();
1126 } 1115 }
1127 else if (NOW < last_activity + ::conf.keepalive) 1116 else if (NOW < last_activity + ::conf.keepalive)
1128 w.at = last_activity + ::conf.keepalive; 1117 w.start (last_activity + ::conf.keepalive);
1129 else if (conf->connectmode != conf_node::C_ONDEMAND 1118 else if (conf->connectmode != conf_node::C_ONDEMAND
1130 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1119 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1131 { 1120 {
1132 send_ping (si); 1121 send_ping (si);
1133 w.at = NOW + 5; 1122 w.start (NOW + 5);
1134 } 1123 }
1135 else if (NOW < last_activity + ::conf.keepalive + 10) 1124 else if (NOW < last_activity + ::conf.keepalive + 10)
1136 // hold ondemand connections implicitly a few seconds longer 1125 // hold ondemand connections implicitly a few seconds longer
1137 // should delete octx, though, or something like that ;) 1126 // should delete octx, though, or something like that ;)
1138 w.at = last_activity + ::conf.keepalive + 10; 1127 w.start (last_activity + ::conf.keepalive + 10);
1139 else 1128 else
1140 reset_connection (); 1129 reset_connection ();
1141} 1130}
1142 1131
1143void connection::send_connect_request (int id) 1132void connection::send_connect_request (int id)

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