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Comparing gvpe/src/connection.C (file contents):
Revision 1.5 by pcg, Wed Apr 2 21:43:44 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
… …
147 } 150 }
148} 151}
149 152
150////////////////////////////////////////////////////////////////////////////// 153//////////////////////////////////////////////////////////////////////////////
151 154
152void pkt_queue::put (tap_packet *p) 155void pkt_queue::put (net_packet *p)
153{ 156{
154 if (queue[i]) 157 if (queue[i])
155 { 158 {
156 delete queue[i]; 159 delete queue[i];
157 j = (j + 1) % QUEUEDEPTH; 160 j = (j + 1) % QUEUEDEPTH;
… …
160 queue[i] = p; 163 queue[i] = p;
161 164
162 i = (i + 1) % QUEUEDEPTH; 165 i = (i + 1) % QUEUEDEPTH;
163} 166}
164 167
165tap_packet *pkt_queue::get () 168net_packet *pkt_queue::get ()
166{ 169{
167 tap_packet *p = queue[j]; 170 net_packet *p = queue[j];
168 171
169 if (p) 172 if (p)
170 { 173 {
171 queue[j] = 0; 174 queue[j] = 0;
172 j = (j + 1) % QUEUEDEPTH; 175 j = (j + 1) % QUEUEDEPTH;
… …
197// only do action once every x seconds per host whole allowing bursts. 200// only do action once every x seconds per host whole allowing bursts.
198// this implementation ("splay list" ;) is inefficient, 201// this implementation ("splay list" ;) is inefficient,
199// but low on resources. 202// but low on resources.
200struct net_rate_limiter : list<net_rateinfo> 203struct net_rate_limiter : list<net_rateinfo>
201{ 204{
202 static const double ALPHA = 1. - 1. / 90.; // allow bursts 205 static const double ALPHA = 1. - 1. / 600.; // allow bursts
203 static const double CUTOFF = 20.; // one event every CUTOFF seconds 206 static const double CUTOFF = 10.; // one event every CUTOFF seconds
204 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time 207 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
208 static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value
205 209
206 bool can (const sockinfo &si) { return can((u32)si.host); } 210 bool can (const sockinfo &si) { return can((u32)si.host); }
207 bool can (u32 host); 211 bool can (u32 host);
208}; 212};
209 213
210net_rate_limiter auth_rate_limiter, reset_rate_limiter; 214net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211 215
… …
225 { 229 {
226 net_rateinfo ri; 230 net_rateinfo ri;
227 231
228 ri.host = host; 232 ri.host = host;
229 ri.pcnt = 1.; 233 ri.pcnt = 1.;
230 ri.diff = CUTOFF * (1. / (1. - ALPHA)); 234 ri.diff = MAXDIF;
231 ri.last = NOW; 235 ri.last = NOW;
232 236
233 push_front (ri); 237 push_front (ri);
234 238
235 return true; 239 return true;
… …
242 ri.pcnt = ri.pcnt * ALPHA; 246 ri.pcnt = ri.pcnt * ALPHA;
243 ri.diff = ri.diff * ALPHA + (NOW - ri.last); 247 ri.diff = ri.diff * ALPHA + (NOW - ri.last);
244 248
245 ri.last = NOW; 249 ri.last = NOW;
246 250
251 double dif = ri.diff / ri.pcnt;
252
247 bool send = ri.diff / ri.pcnt > CUTOFF; 253 bool send = dif > CUTOFF;
248 254
255 if (dif > MAXDIF)
256 {
257 ri.pcnt = 1.;
258 ri.diff = MAXDIF;
259 }
249 if (send) 260 else if (send)
250 ri.pcnt++; 261 ri.pcnt++;
251 262
252 push_front (ri); 263 push_front (ri);
253 264
254 return send; 265 return send;
… …
285 hmac_gen (ctx); 296 hmac_gen (ctx);
286 297
287 return !memcmp (hmac, hmac_digest, HMACLENGTH); 298 return !memcmp (hmac, hmac_digest, HMACLENGTH);
288} 299}
289 300
290void vpn_packet::set_hdr (ptype type, unsigned int dst) 301void vpn_packet::set_hdr (ptype type_, unsigned int dst)
291{ 302{
292 this->type = type; 303 type = type_;
293 304
294 int src = THISNODE->id; 305 int src = THISNODE->id;
295 306
296 src1 = src; 307 src1 = src;
297 srcdst = ((src >> 8) << 4) | (dst >> 8); 308 srcdst = ((src >> 8) << 4) | (dst >> 8);
… …
299} 310}
300 311
301#define MAXVPNDATA (MAX_MTU - 6 - 6) 312#define MAXVPNDATA (MAX_MTU - 6 - 6)
302#define DATAHDR (sizeof (u32) + RAND_SIZE) 313#define DATAHDR (sizeof (u32) + RAND_SIZE)
303 314
304struct vpndata_packet:vpn_packet 315struct vpndata_packet : vpn_packet
305 { 316 {
306 u8 data[MAXVPNDATA + DATAHDR]; // seqno 317 u8 data[MAXVPNDATA + DATAHDR]; // seqno
307 318
308 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);
309 tap_packet *unpack (connection *conn, u32 &seqno); 320 tap_packet *unpack (connection *conn, u32 &seqno);
… …
467 set_hdr (type, dst); 478 set_hdr (type, dst);
468} 479}
469 480
470bool config_packet::chk_config () const 481bool config_packet::chk_config () const
471{ 482{
472 return prot_major == PROTOCOL_MAJOR 483 if (prot_major != PROTOCOL_MAJOR)
473 && randsize == RAND_SIZE 484 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474 && hmaclen == HMACLENGTH 485 else if (randsize != RAND_SIZE)
475 && flags == curflags () 486 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487 else if (hmaclen != HMACLENGTH)
488 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489 else if (flags != curflags ())
490 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
476 && challengelen == sizeof (rsachallenge) 491 else if (challengelen != sizeof (rsachallenge))
492 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
477 && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) 493 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
494 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
478 && digest_nid == htonl (EVP_MD_type (RSA_HASH)) 495 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
496 slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
479 && hmac_nid == htonl (EVP_MD_type (DIGEST)); 497 else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
498 slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
499 else
500 return true;
501
502 return false;
480} 503}
481 504
482struct auth_req_packet : config_packet 505struct auth_req_packet : config_packet
483{ 506{
484 char magic[8]; 507 char magic[8];
485 u8 initiate; // false if this is just an automatic reply 508 u8 initiate; // false if this is just an automatic reply
486 u8 protocols; // supported protocols (will get patches on forward) 509 u8 protocols; // supported protocols (will be patched on forward)
487 u8 pad2, pad3; 510 u8 pad2, pad3;
488 rsaid id; 511 rsaid id;
489 rsaencrdata encr; 512 rsaencrdata encr;
490 513
491 auth_req_packet (int dst, bool initiate_, u8 protocols_) 514 auth_req_packet (int dst, bool initiate_, u8 protocols_)
… …
546}; 569};
547 570
548///////////////////////////////////////////////////////////////////////////// 571/////////////////////////////////////////////////////////////////////////////
549 572
550void 573void
574connection::connection_established ()
575{
576 if (ictx && octx)
577 {
578 connectmode = conf->connectmode;
579
580 rekey.start (NOW + ::conf.rekey);
581 keepalive.start (NOW + ::conf.keepalive);
582
583 // send queued packets
584 if (ictx && octx)
585 {
586 while (tap_packet *p = (tap_packet *)data_queue.get ())
587 {
588 send_data_packet (p);
589 delete p;
590 }
591
592 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
593 {
594 send_vpn_packet (p, si, IPTOS_RELIABILITY);
595 delete p;
596 }
597 }
598 }
599 else
600 {
601 retry_cnt = 0;
602 establish_connection.start (NOW + 5);
603 keepalive.stop ();
604 rekey.stop ();
605 }
606}
607
608void
551connection::reset_dstaddr () 609connection::reset_si ()
552{ 610{
553 si.set (conf);
554}
555
556void
557connection::send_ping (const sockinfo &si, u8 pong)
558{
559 ping_packet *pkt = new ping_packet;
560
561 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
562 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563
564 delete pkt;
565}
566
567void
568connection::send_reset (const sockinfo &si)
569{
570 if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
571 {
572 config_packet *pkt = new config_packet;
573
574 pkt->setup (vpn_packet::PT_RESET, conf->id);
575 send_vpn_packet (pkt, si, IPTOS_MINCOST);
576
577 delete pkt;
578 }
579}
580
581void
582connection::send_auth_request (const sockinfo &si, bool initiate)
583{
584 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
585
586 protocol = best_protocol (THISNODE->protocols & conf->protocols); 611 protocol = best_protocol (THISNODE->protocols & conf->protocols);
587 612
588 // mask out protocols we cannot establish 613 // mask out protocols we cannot establish
589 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 614 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 615 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591 616
592 if (protocol) 617 si.set (conf, protocol);
618}
619
620// ensure sockinfo is valid, forward if necessary
621const sockinfo &
622connection::forward_si (const sockinfo &si) const
623{
624 if (!si.valid ())
625 {
626 connection *r = vpn->find_router ();
627
628 if (r)
629 {
630 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),
631 conf->nodename, r->conf->nodename);
632 return r->si;
633 }
634 else
635 slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
636 conf->nodename);
593 { 637 }
594 rsachallenge chg;
595 638
596 rsa_cache.gen (pkt->id, chg); 639 return si;
640}
597 641
598 if (0 > RSA_public_encrypt (sizeof chg, 642void
599 (unsigned char *)&chg, (unsigned char *)&pkt->encr, 643connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
600 conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) 644{
601 fatal ("RSA_public_encrypt error"); 645 if (!vpn->send_vpn_packet (pkt, si, tos))
646 reset_connection ();
647}
602 648
603 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 649void
650connection::send_ping (const sockinfo &si, u8 pong)
651{
652 ping_packet *pkt = new ping_packet;
604 653
605 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 654 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
655 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656
657 delete pkt;
658}
659
660void
661connection::send_reset (const sockinfo &si)
662{
663 if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
664 {
665 config_packet *pkt = new config_packet;
666
667 pkt->setup (vpn_packet::PT_RESET, conf->id);
668 send_vpn_packet (pkt, si, IPTOS_MINCOST);
606 669
607 delete pkt; 670 delete pkt;
608 } 671 }
609 else 672}
610 ; // silently fail 673
674void
675connection::send_auth_request (const sockinfo &si, bool initiate)
676{
677 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
678
679 rsachallenge chg;
680 rsa_cache.gen (pkt->id, chg);
681 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
682
683 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
684
685 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
686
687 delete pkt;
611} 688}
612 689
613void 690void
614connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) 691connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
615{ 692{
… …
643} 720}
644 721
645void 722void
646connection::establish_connection_cb (time_watcher &w) 723connection::establish_connection_cb (time_watcher &w)
647{ 724{
648 if (ictx || conf == THISNODE 725 if (!ictx
726 && conf != THISNODE
649 || connectmode == conf_node::C_NEVER 727 && connectmode != conf_node::C_NEVER
650 || connectmode == conf_node::C_DISABLED) 728 && connectmode != conf_node::C_DISABLED
651 w.at = TSTAMP_CANCEL; 729 && NOW > w.at)
652 else if (w.at <= NOW)
653 { 730 {
654 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;
655 732
656 if (retry_int < 3600 * 8) 733 if (retry_int < 3600 * 8)
657 retry_cnt++; 734 retry_cnt++;
658 735
659 w.at = NOW + retry_int; 736 w.start (NOW + retry_int);
660 737
661 if (conf->hostname) 738 reset_si ();
739
740 if (si.prot && !si.host)
741 vpn->send_connect_request (conf->id);
742 else
662 { 743 {
663 reset_dstaddr (); 744 const sockinfo &dsi = forward_si (si);
745
664 if (si.host && auth_rate_limiter.can (si)) 746 if (dsi.valid () && auth_rate_limiter.can (dsi))
665 { 747 {
666 if (retry_cnt < 4) 748 if (retry_cnt < 4)
667 send_auth_request (si, true); 749 send_auth_request (dsi, true);
668 else 750 else
669 send_ping (si, 0); 751 send_ping (dsi, 0);
670 } 752 }
671 } 753 }
672 else
673 vpn->connect_request (conf->id);
674 } 754 }
675} 755}
676 756
677void 757void
678connection::reset_connection () 758connection::reset_connection ()
… …
692 si.host= 0; 772 si.host= 0;
693 773
694 last_activity = 0; 774 last_activity = 0;
695 retry_cnt = 0; 775 retry_cnt = 0;
696 776
697 rekey.reset (); 777 rekey.stop ();
698 keepalive.reset (); 778 keepalive.stop ();
699 establish_connection.reset (); 779 establish_connection.stop ();
700} 780}
701 781
702void 782void
703connection::shutdown () 783connection::shutdown ()
704{ 784{
… …
709} 789}
710 790
711void 791void
712connection::rekey_cb (time_watcher &w) 792connection::rekey_cb (time_watcher &w)
713{ 793{
714 w.at = TSTAMP_CANCEL;
715
716 reset_connection (); 794 reset_connection ();
717 establish_connection (); 795 establish_connection ();
718} 796}
719 797
720void 798void
721connection::send_data_packet (tap_packet *pkt, bool broadcast) 799connection::send_data_packet (tap_packet *pkt)
722{ 800{
723 vpndata_packet *p = new vpndata_packet; 801 vpndata_packet *p = new vpndata_packet;
724 int tos = 0; 802 int tos = 0;
725 803
726 if (conf->inherit_tos 804 // I am not hilarious about peeking into packets, but so be it.
727 && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP 805 if (conf->inherit_tos && pkt->is_ipv4 ())
728 && ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729 tos = (*pkt)[15] & IPTOS_TOS_MASK; 806 tos = (*pkt)[15] & IPTOS_TOS_MASK;
730 807
731 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
732 send_vpn_packet (p, si, tos); 809 send_vpn_packet (p, si, tos);
733 810
734 delete p; 811 delete p;
735 812
736 if (oseqno > MAX_SEQNO) 813 if (oseqno > MAX_SEQNO)
737 rekey (); 814 rekey ();
738} 815}
739 816
740void 817void
741connection::inject_data_packet (tap_packet *pkt, bool broadcast) 818connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)
742{ 819{
743 if (ictx && octx) 820 if (ictx && octx)
744 send_data_packet (pkt, broadcast); 821 send_data_packet (pkt);
745 else 822 else
746 { 823 {
747 if (!broadcast)//DDDD 824 if (!broadcast)//DDDD
748 queue.put (new tap_packet (*pkt)); 825 data_queue.put (new tap_packet (*pkt));
826
827 establish_connection ();
828 }
829}
830
831void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832{
833 if (ictx && octx)
834 send_vpn_packet (pkt, si, tos);
835 else
836 {
837 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
749 838
750 establish_connection (); 839 establish_connection ();
751 } 840 }
752} 841}
753 842
… …
812 if (p->initiate) 901 if (p->initiate)
813 send_auth_request (rsi, false); 902 send_auth_request (rsi, false);
814 903
815 rsachallenge k; 904 rsachallenge k;
816 905
817 if (0 > RSA_private_decrypt (sizeof (p->encr), 906 if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
818 (unsigned char *)&p->encr, (unsigned char *)&k, 907 {
819 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
820 slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), 908 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
821 conf->nodename, (const char *)rsi); 909 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
910 break;
911 }
822 else 912 else
823 { 913 {
824 retry_cnt = 0;
825 establish_connection.set (NOW + 8); //? ;)
826 keepalive.reset ();
827 rekey.reset ();
828
829 delete ictx;
830 ictx = 0;
831
832 delete octx; 914 delete octx;
833 915
834 octx = new crypto_ctx (k, 1); 916 octx = new crypto_ctx (k, 1);
835 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 917 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
836 918
837 conf->protocols = p->protocols; 919 conf->protocols = p->protocols;
920
838 send_auth_response (rsi, p->id, k); 921 send_auth_response (rsi, p->id, k);
922
923 connection_established ();
839 924
840 break; 925 break;
841 } 926 }
842 } 927 }
928 else
929 slog (L_WARN, _("%s(%s): protocol mismatch"),
930 conf->nodename, (const char *)rsi);
843 931
844 send_reset (rsi); 932 send_reset (rsi);
845 } 933 }
846 934
847 break; 935 break;
… …
860 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 948 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861 949
862 rsachallenge chg; 950 rsachallenge chg;
863 951
864 if (!rsa_cache.find (p->id, chg)) 952 if (!rsa_cache.find (p->id, chg))
953 {
865 slog (L_ERR, _("%s(%s): unrequested auth response"), 954 slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
866 conf->nodename, (const char *)rsi); 955 conf->nodename, (const char *)rsi);
956 break;
957 }
867 else 958 else
868 { 959 {
869 crypto_ctx *cctx = new crypto_ctx (chg, 0); 960 crypto_ctx *cctx = new crypto_ctx (chg, 0);
870 961
871 if (!p->hmac_chk (cctx)) 962 if (!p->hmac_chk (cctx))
963 {
872 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"
873 "could be an attack, or just corruption or an synchronization error"), 965 "could be an attack, or just corruption or a synchronization error"),
874 conf->nodename, (const char *)rsi); 966 conf->nodename, (const char *)rsi);
967 break;
968 }
875 else 969 else
876 { 970 {
877 rsaresponse h; 971 rsaresponse h;
878 972
879 rsa_hash (p->id, chg, h); 973 rsa_hash (p->id, chg, h);
… …
885 delete ictx; ictx = cctx; 979 delete ictx; ictx = cctx;
886 980
887 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid 981 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888 982
889 si = rsi; 983 si = rsi;
984 protocol = rsi.prot;
890 985
891 rekey.set (NOW + ::conf.rekey); 986 connection_established ();
892 keepalive.set (NOW + ::conf.keepalive);
893 987
894 // send queued packets
895 while (tap_packet *p = queue.get ())
896 {
897 send_data_packet (p);
898 delete p;
899 }
900
901 connectmode = conf->connectmode;
902
903 slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"), 988 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
904 conf->nodename, (const char *)rsi, 989 conf->nodename, (const char *)rsi,
905 strprotocol (protocol),
906 p->prot_major, p->prot_minor); 990 p->prot_major, p->prot_minor);
907 991
908 if (::conf.script_node_up) 992 if (::conf.script_node_up)
909 run_script (run_script_cb (this, &connection::script_node_up), false); 993 run_script (run_script_cb (this, &connection::script_node_up), false);
910 994
… …
933 1017
934 if (ictx && octx) 1018 if (ictx && octx)
935 { 1019 {
936 vpndata_packet *p = (vpndata_packet *)pkt; 1020 vpndata_packet *p = (vpndata_packet *)pkt;
937 1021
938 if (rsi == si) 1022 if (!p->hmac_chk (ictx))
1023 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1024 "could be an attack, or just corruption or a synchronization error"),
1025 conf->nodename, (const char *)rsi);
1026 else
939 { 1027 {
940 if (!p->hmac_chk (ictx))
941 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
942 "could be an attack, or just corruption or an synchronization error"),
943 conf->nodename, (const char *)rsi);
944 else 1028 u32 seqno;
1029 tap_packet *d = p->unpack (this, seqno);
1030
1031 if (iseqno.recv_ok (seqno))
945 { 1032 {
946 u32 seqno; 1033 vpn->tap->send (d);
947 tap_packet *d = p->unpack (this, seqno);
948 1034
949 if (iseqno.recv_ok (seqno)) 1035 if (si != rsi)
950 { 1036 {
951 vpn->tap->send (d); 1037 // fast re-sync on connection changes, useful especially for tcp/ip
952
953 if (p->dst () == 0) // re-broadcast
954 for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
955 {
956 connection *c = *i;
957
958 if (c->conf != THISNODE && c->conf != conf)
959 c->inject_data_packet (d);
960 }
961
962 delete d;
963
964 break; 1038 si = rsi;
1039
1040 slog (L_INFO, _("%s(%s): socket address changed to %s"),
1041 conf->nodename, (const char *)si, (const char *)rsi);
965 } 1042 }
1043
1044 delete d;
1045
1046 break;
966 } 1047 }
967 } 1048 }
968 else
969 slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
970 } 1049 }
971 1050
972 send_reset (rsi); 1051 send_reset (rsi);
973 break; 1052 break;
974 1053
… …
976 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1055 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977 { 1056 {
978 connect_req_packet *p = (connect_req_packet *) pkt; 1057 connect_req_packet *p = (connect_req_packet *) pkt;
979 1058
980 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1059 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
1060 connection *c = vpn->conns[p->id - 1];
981 conf->protocols = p->protocols; 1061 conf->protocols = p->protocols;
982 connection *c = vpn->conns[p->id - 1];
983 1062
984 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", 1063 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985 conf->id, p->id, c->ictx && c->octx); 1064 conf->id, p->id, c->ictx && c->octx);
986 1065
987 if (c->ictx && c->octx) 1066 if (c->ictx && c->octx)
… …
989 // send connect_info packets to both sides, in case one is 1068 // send connect_info packets to both sides, in case one is
990 // behind a nat firewall (or both ;) 1069 // behind a nat firewall (or both ;)
991 c->send_connect_info (conf->id, si, conf->protocols); 1070 c->send_connect_info (conf->id, si, conf->protocols);
992 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1071 send_connect_info (c->conf->id, c->si, c->conf->protocols);
993 } 1072 }
1073 else
1074 c->establish_connection ();
994 } 1075 }
995 1076
996 break; 1077 break;
997 1078
998 case vpn_packet::PT_CONNECT_INFO: 1079 case vpn_packet::PT_CONNECT_INFO:
999 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1080 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000 { 1081 {
1001 connect_info_packet *p = (connect_info_packet *) pkt; 1082 connect_info_packet *p = (connect_info_packet *) pkt;
1002 1083
1003 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1084 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
1004 conf->protocols = p->protocols; 1085
1005 connection *c = vpn->conns[p->id - 1]; 1086 connection *c = vpn->conns[p->id - 1];
1087
1088 c->conf->protocols = p->protocols;
1089 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1090 p->si.upgrade_protocol (protocol, c->conf);
1006 1091
1007 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1092 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1008 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1093 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1009 1094
1095 const sockinfo &dsi = forward_si (p->si);
1096
1097 if (dsi.valid ())
1010 c->send_auth_request (p->si, true); 1098 c->send_auth_request (dsi, true);
1011 } 1099 }
1012 1100
1013 break; 1101 break;
1014 1102
1015 default: 1103 default:
… …
1024 { 1112 {
1025 reset_connection (); 1113 reset_connection ();
1026 establish_connection (); 1114 establish_connection ();
1027 } 1115 }
1028 else if (NOW < last_activity + ::conf.keepalive) 1116 else if (NOW < last_activity + ::conf.keepalive)
1029 w.at = last_activity + ::conf.keepalive; 1117 w.start (last_activity + ::conf.keepalive);
1030 else if (conf->connectmode != conf_node::C_ONDEMAND 1118 else if (conf->connectmode != conf_node::C_ONDEMAND
1031 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1119 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1032 { 1120 {
1033 send_ping (si); 1121 send_ping (si);
1034 w.at = NOW + 5; 1122 w.start (NOW + 5);
1035 } 1123 }
1124 else if (NOW < last_activity + ::conf.keepalive + 10)
1125 // hold ondemand connections implicitly a few seconds longer
1126 // should delete octx, though, or something like that ;)
1127 w.start (last_activity + ::conf.keepalive + 10);
1036 else 1128 else
1037 reset_connection (); 1129 reset_connection ();
1038} 1130}
1039 1131
1040void connection::connect_request (int id) 1132void connection::send_connect_request (int id)
1041{ 1133{
1042 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1134 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1043 1135
1044 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1136 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1045 p->hmac_set (octx); 1137 p->hmac_set (octx);
… …
1075 putenv ("STATE=down"); 1167 putenv ("STATE=down");
1076 1168
1077 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1169 return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1078} 1170}
1079 1171
1080// send a vpn packet out to other hosts
1081void
1082connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1083{
1084 switch (protocol)
1085 {
1086 case PROT_IPv4:
1087 vpn->send_ipv4_packet (pkt, si, tos);
1088 break;
1089
1090 case PROT_UDPv4:
1091 vpn->send_udpv4_packet (pkt, si, tos);
1092 break;
1093
1094#if ENABLE_TCP
1095 case PROT_TCPv4:
1096 vpn->send_tcpv4_packet (pkt, si, tos);
1097 break;
1098#endif
1099 }
1100}
1101
1102connection::connection(struct vpn *vpn_) 1172connection::connection(struct vpn *vpn_)
1103: vpn(vpn_) 1173: vpn(vpn_)
1104, rekey (this, &connection::rekey_cb) 1174, rekey (this, &connection::rekey_cb)
1105, keepalive (this, &connection::keepalive_cb) 1175, keepalive (this, &connection::keepalive_cb)
1106, establish_connection (this, &connection::establish_connection_cb) 1176, establish_connection (this, &connection::establish_connection_cb)

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