ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/gvpe/src/connection.C
(Generate patch)

Comparing gvpe/src/connection.C (file contents):
Revision 1.101 by root, Wed Jul 17 16:40:57 2013 UTC vs.
Revision 1.112 by root, Fri Sep 12 10:40:43 2014 UTC

… …
33 33
34#include <list> 34#include <list>
35#include <queue> 35#include <queue>
36#include <utility> 36#include <utility>
37 37
38#include <openssl/opensslv.h>
38#include <openssl/rand.h> 39#include <openssl/rand.h>
39#include <openssl/evp.h> 40#include <openssl/evp.h>
40#include <openssl/rsa.h> 41#include <openssl/rsa.h>
41#include <openssl/err.h> 42#include <openssl/err.h>
43
44// openssl 0.9.8 compatibility
45#if OPENSSL_VERSION_NUMBER < 0x10100000
46 #define require101(exp) exp
47#else
48 #define require101(exp) require (exp)
49#endif
42 50
43#include "conf.h" 51#include "conf.h"
44#include "slog.h" 52#include "slog.h"
45#include "device.h" 53#include "device.h"
46#include "vpn.h" 54#include "vpn.h"
… …
48#include "hkdf.h" 56#include "hkdf.h"
49 57
50#include "netcompat.h" 58#include "netcompat.h"
51 59
52#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic 60#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
53#define MAGIC "PORN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
54 61
55#define ULTRA_FAST 1 62#define ULTRA_FAST 1
56#define HLOG 15 63#define HLOG 15
57#include "lzf/lzf.h" 64#include "lzf/lzf.h"
58#include "lzf/lzf_c.c" 65#include "lzf/lzf_c.c"
… …
120 { 127 {
121 u8 mac_key[MAC_KEYSIZE]; 128 u8 mac_key[MAC_KEYSIZE];
122 static const unsigned char mac_info[] = "gvpe mac key"; 129 static const unsigned char mac_info[] = "gvpe mac key";
123 130
124 hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); 131 hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
125 kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
126 kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key)); 132 kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
127 kdf.extract (s, sizeof (s)); 133 kdf.extract (s, sizeof (s));
128 kdf.extract_done (HKDF_PRF_HASH ()); 134 kdf.extract_done (HKDF_PRF_HASH ());
129 kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info)); 135 kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
130 136
131 HMAC_CTX_init (&hctx); 137 HMAC_CTX_init (&hctx);
132 require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0)); 138 require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
133 } 139 }
134 140
135 { 141 {
136 u8 cipher_key[CIPHER_KEYSIZE]; 142 u8 cipher_key[CIPHER_KEYSIZE];
137 static const unsigned char cipher_info[] = "gvpe cipher key"; 143 static const unsigned char cipher_info[] = "gvpe cipher key";
138 144
139 hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); 145 hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
140 kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
141 kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key)); 146 kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
142 kdf.extract (s, sizeof (s)); 147 kdf.extract (s, sizeof (s));
143 kdf.extract_done (HKDF_PRF_HASH ()); 148 kdf.extract_done (HKDF_PRF_HASH ());
144 kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info)); 149 kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
145 150
… …
180 185
181 return 1; 186 return 1;
182} 187}
183 188
184static void 189static void
185auth_hash (const auth_data &auth, auth_mac &mac) 190auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
186{ 191{
187 HMAC_CTX ctx; 192 hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
188 193 kdf.extract (&auth.rsa, sizeof (auth.rsa));
189 HMAC_CTX_init (&ctx); 194 kdf.extract_done ();
190 require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0)); 195 kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
191 require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
192 require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
193 HMAC_CTX_cleanup (&ctx);
194} 196}
195 197
196void 198void
197connection::generate_auth_data () 199connection::generate_auth_data ()
198{ 200{
199 if (auth_expire < ev_now ()) 201 if (auth_expire < ev_now ())
200 { 202 {
201 // request data 203 // request data
202 rand_fill (snd_auth.rsa); 204 rand_fill (snd_auth.rsa);
203 curve25519_generate (snd_ecdh_a, snd_auth.ecdh); 205 curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
204 auth_hash (snd_auth, snd_auth_mac);
205 206
206 // eventual response data 207 // eventual response data
207 curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); 208 curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
208 } 209 }
209 210
… …
365 } 366 }
366} 367}
367 368
368///////////////////////////////////////////////////////////////////////////// 369/////////////////////////////////////////////////////////////////////////////
369 370
370unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
371
372void 371void
373hmac_packet::hmac_gen (crypto_ctx *ctx) 372hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
374{ 373{
375 unsigned int xlen;
376
377 HMAC_CTX *hctx = &ctx->hctx; 374 HMAC_CTX *hctx = &ctx->hctx;
378 375
379 require (HMAC_Init_ex (hctx, 0, 0, 0, 0)); 376 require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
380 require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), 377 require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
381 len - sizeof (hmac_packet)));
382 require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen)); 378 require101 (HMAC_Final (hctx, hmac_digest, 0));
383} 379}
384 380
385void 381void
386hmac_packet::hmac_set (crypto_ctx *ctx) 382hmac_packet::hmac_set (crypto_ctx *ctx)
387{ 383{
388 hmac_gen (ctx); 384 unsigned char hmac_digest[EVP_MAX_MD_SIZE];
389 385 hmac_gen (ctx, hmac_digest);
390 memcpy (hmac, hmac_digest, HMACLENGTH); 386 memcpy (hmac, hmac_digest, HMACLENGTH);
391} 387}
392 388
393bool 389bool
394hmac_packet::hmac_chk (crypto_ctx *ctx) 390hmac_packet::hmac_chk (crypto_ctx *ctx)
395{ 391{
396 hmac_gen (ctx); 392 unsigned char hmac_digest[EVP_MAX_MD_SIZE];
397 393 hmac_gen (ctx, hmac_digest);
398 return !memcmp (hmac, hmac_digest, HMACLENGTH); 394 return slow_memeq (hmac, hmac_digest, HMACLENGTH);
399} 395}
400 396
401void 397void
402vpn_packet::set_hdr (ptype type_, unsigned int dst) 398vpn_packet::set_hdr (ptype type_, unsigned int dst)
403{ 399{
… …
462 u32 seqno; 458 u32 seqno;
463 } datahdr; 459 } datahdr;
464 460
465 datahdr.seqno = ntohl (seqno); 461 datahdr.seqno = ntohl (seqno);
466#if RAND_SIZE 462#if RAND_SIZE
467 require (RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE) >= 0); 463 // NB: a constant (per session) random prefix
464 // is likely enough, but we don't take any chances.
465 conn->oiv.get (datahdr.rnd, RAND_SIZE);
468#endif 466#endif
469 467
470 require (EVP_EncryptUpdate (cctx, 468 require (EVP_EncryptUpdate (cctx,
471 (unsigned char *) data + outl, &outl2, 469 (unsigned char *) data + outl, &outl2,
472 (unsigned char *) &datahdr, DATAHDR)); 470 (unsigned char *) &datahdr, DATAHDR));
… …
552 } 550 }
553}; 551};
554 552
555struct config_packet : vpn_packet 553struct config_packet : vpn_packet
556{ 554{
555 u8 serial[SERIAL_SIZE];
557 u8 prot_major, prot_minor, randsize; 556 u8 prot_major, prot_minor, randsize;
558 u8 flags, features, pad6, pad7, pad8; 557 u8 flags, features, pad6, pad7, pad8;
559 u32 cipher_nid, mac_nid, auth_nid; 558 u32 cipher_nid, mac_nid, auth_nid;
560 559
561 void setup (ptype type, int dst); 560 void setup (ptype type, int dst);
562 bool chk_config () const; 561 bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
563 562
564 static u8 get_features () 563 static u8 get_features ()
565 { 564 {
566 u8 f = 0; 565 u8 f = 0;
567#if ENABLE_COMPRESSION 566#if ENABLE_COMPRESSION
… …
584 prot_minor = PROTOCOL_MINOR; 583 prot_minor = PROTOCOL_MINOR;
585 randsize = RAND_SIZE; 584 randsize = RAND_SIZE;
586 flags = 0; 585 flags = 0;
587 features = get_features (); 586 features = get_features ();
588 587
588 strncpy ((char *)serial, conf.serial, sizeof (serial));
589
589 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); 590 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
590 mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); 591 mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
591 auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); 592 auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
592 593
593 len = sizeof (*this) - sizeof (net_packet); 594 len = sizeof (*this) - sizeof (net_packet);
594 set_hdr (type, dst); 595 set_hdr (type, dst);
595} 596}
596 597
597bool 598bool
598config_packet::chk_config () const 599config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
599{ 600{
600 if (prot_major != PROTOCOL_MAJOR) 601 if (prot_major != PROTOCOL_MAJOR)
601 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 602 slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
603 conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
602 else if (randsize != RAND_SIZE) 604 else if (randsize != RAND_SIZE)
603 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 605 slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
606 conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
604 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ()))) 607 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
605 slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ())); 608 slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
609 conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
606 else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ()))) 610 else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
607 slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); 611 slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
612 conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
608 else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) 613 else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
609 slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); 614 slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
615 conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
610 else 616 else
617 {
618 int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
619
620 if (cmp > 0)
621 slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
622 conf->nodename, (const char *)rsi);
623 else if (cmp == 0)
611 return true; 624 return true;
625 }
612 626
613 return false; 627 return false;
614} 628}
615 629
616struct auth_req_packet : config_packet // UNPROTECTED 630struct auth_req_packet : config_packet // UNPROTECTED
… …
630 644
631 len = sizeof (*this) - sizeof (net_packet); 645 len = sizeof (*this) - sizeof (net_packet);
632 } 646 }
633}; 647};
634 648
635struct auth_res_packet : config_packet // UNPROTECTED 649struct auth_res_packet : vpn_packet // UNPROTECTED
636{ 650{
637 auth_response response; 651 auth_response response;
638 652
639 auth_res_packet (int dst) 653 auth_res_packet (int dst)
640 { 654 {
641 config_packet::setup (PT_AUTH_RES, dst); 655 set_hdr (PT_AUTH_RES, dst);
642 656
643 len = sizeof (*this) - sizeof (net_packet); 657 len = sizeof (*this) - sizeof (net_packet);
644 } 658 }
645}; 659};
646 660
… …
686 si = rsi; 700 si = rsi;
687 protocol = rsi.prot; 701 protocol = rsi.prot;
688 702
689 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), 703 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
690 conf->nodename, (const char *)rsi, 704 conf->nodename, (const char *)rsi,
691 is_direct ? "direct" : "forwarded", 705 vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
692 PROTOCOL_MAJOR, prot_minor); 706 PROTOCOL_MAJOR, prot_minor);
693 707
694 if (::conf.script_node_up) 708 if (::conf.script_node_up)
695 { 709 {
696 run_script_cb *cb = new run_script_cb; 710 run_script_cb *cb = new run_script_cb;
… …
702 iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); 716 iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
703 717
704 delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); 718 delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
705 oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; 719 oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
706 720
707 if (ictx && octx) 721 oiv.reset ();
708 { 722
709 // make sure rekeying timeouts are slightly asymmetric 723 // make sure rekeying timeouts are slightly asymmetric
710 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); 724 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
711 rekey.start (rekey_interval, rekey_interval); 725 rekey.start (rekey_interval, rekey_interval);
712 726
727 hmac_error = 0.;
728
713 keepalive.start (::conf.keepalive); 729 keepalive.start (::conf.keepalive);
714 730
715 // send queued packets 731 // send queued packets
716 if (ictx && octx)
717 {
718 while (tap_packet *p = (tap_packet *)data_queue.get ()) 732 while (tap_packet *p = (tap_packet *)data_queue.get ())
719 { 733 {
720 if (p->len) send_data_packet (p); 734 if (p->len) send_data_packet (p);
721 delete p; 735 delete p;
722 } 736 }
723 737
724 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) 738 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
725 { 739 {
726 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); 740 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
727 delete p; 741 delete p;
728 } 742 }
729 }
730 743
731 vpn->connection_established (this); 744 vpn->connection_established (this);
732 }
733#if 0
734 else
735 {
736 retry_cnt = 0;
737 establish_connection.start (5);
738 keepalive.stop ();
739 rekey.stop ();
740 }
741#endif
742} 745}
743 746
744void 747void
745connection::reset_si () 748connection::reset_si ()
746{ 749{
… …
751 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); 754 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
752 protocol = 0; 755 protocol = 0;
753 } 756 }
754 757
755 si.set (conf, protocol); 758 si.set (conf, protocol);
756
757 is_direct = si.valid ();
758} 759}
759 760
760// ensure sockinfo is valid, forward if necessary 761// ensure sockinfo is valid, forward if necessary
761const sockinfo & 762const sockinfo &
762connection::forward_si (const sockinfo &si) const 763connection::forward_si (const sockinfo &si) const
… …
781 782
782void 783void
783connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 784connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
784{ 785{
785 if (!vpn->send_vpn_packet (pkt, si, tos)) 786 if (!vpn->send_vpn_packet (pkt, si, tos))
786 reset_connection (); 787 reset_connection ("packet send error");
787} 788}
788 789
789void 790void
790connection::send_ping (const sockinfo &si, u8 pong) 791connection::send_ping (const sockinfo &si, u8 pong)
791{ 792{
… …
830void 831void
831connection::send_auth_response (const sockinfo &si) 832connection::send_auth_response (const sockinfo &si)
832{ 833{
833 auth_res_packet *pkt = new auth_res_packet (conf->id); 834 auth_res_packet *pkt = new auth_res_packet (conf->id);
834 835
835 auth_hash (rcv_auth, pkt->response.mac);
836 memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b)); 836 memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
837 auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
837 838
838 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); 839 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
839 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 840 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
840 841
841 delete pkt; 842 delete pkt;
… …
867 { 868 {
868 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection 869 // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
869 // and stop trying. should probably be handled by a per-connection expire handler. 870 // and stop trying. should probably be handled by a per-connection expire handler.
870 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) 871 if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
871 { 872 {
872 reset_connection (); 873 reset_connection ("no demand");
873 return; 874 return;
874 } 875 }
875 876
876 last_establish_attempt = ev_now (); 877 last_establish_attempt = ev_now ();
877 878
… …
879 ? (retry_cnt & 3) + 1 880 ? (retry_cnt & 3) + 1
880 : 1 << (retry_cnt >> 2)); 881 : 1 << (retry_cnt >> 2));
881 882
882 reset_si (); 883 reset_si ();
883 884
884 bool slow = si.prot & PROT_SLOW; 885 bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
885 886
886 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) 887 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
887 { 888 {
888 /*TODO*/ /* start the timer so we don't recurse endlessly */ 889 /*TODO*/ /* start the timer so we don't recurse endlessly */
889 w.start (1); 890 w.start (1);
… …
899 900
900 slow = slow || (dsi.prot & PROT_SLOW); 901 slow = slow || (dsi.prot & PROT_SLOW);
901 902
902 if (dsi.valid () && auth_rate_limiter.can (dsi)) 903 if (dsi.valid () && auth_rate_limiter.can (dsi))
903 { 904 {
904 if (retry_cnt < 4) 905 // use ping after the first few retries
906 // TODO: on rekeys, the other node might not interpret ping correctly,
907 // TODO: as it will still have a valid connection
908 if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
905 send_auth_request (dsi, true); 909 send_auth_request (dsi, true);
906 else 910 else
907 send_ping (dsi, 0); 911 send_ping (dsi, 0);
908 } 912 }
909 } 913 }
910 914
911 retry_int *= slow ? 8. : 0.9; 915 retry_int *= slow ? 4. : 0.9;
912 916
913 if (retry_int < conf->max_retry) 917 if (retry_int < conf->max_retry)
914 retry_cnt++; 918 retry_cnt++;
915 else 919 else
916 retry_int = conf->max_retry; 920 retry_int = conf->max_retry;
… …
918 w.start (retry_int); 922 w.start (retry_int);
919 } 923 }
920} 924}
921 925
922void 926void
923connection::reset_connection () 927connection::reset_connection (const char *reason)
924{ 928{
925 if (ictx && octx) 929 if (ictx && octx)
926 { 930 {
927 slog (L_INFO, _("%s(%s): connection lost"), 931 slog (L_INFO, _("%s(%s): connection lost (%s)"),
928 conf->nodename, (const char *)si); 932 conf->nodename, (const char *)si, reason);
929 933
930 if (::conf.script_node_down) 934 if (::conf.script_node_down)
931 { 935 {
932 run_script_cb *cb = new run_script_cb; 936 run_script_cb *cb = new run_script_cb;
933 cb->set<connection, &connection::script_node_down> (this); 937 cb->set<connection, &connection::script_node_down> (this);
… …
957connection::shutdown () 961connection::shutdown ()
958{ 962{
959 if (ictx && octx) 963 if (ictx && octx)
960 send_reset (si); 964 send_reset (si);
961 965
962 reset_connection (); 966 reset_connection ("shutdown");
963} 967}
964 968
965// poor-man's rekeying 969// poor-man's rekeying
966inline void 970inline void
967connection::rekey_cb (ev::timer &w, int revents) 971connection::rekey_cb (ev::timer &w, int revents)
968{ 972{
969 reset_connection (); 973 reset_connection ("rekeying");
970 establish_connection (); 974 establish_connection ();
971} 975}
972 976
973void 977void
974connection::send_data_packet (tap_packet *pkt) 978connection::send_data_packet (tap_packet *pkt)
… …
991 995
992void 996void
993connection::post_inject_queue () 997connection::post_inject_queue ()
994{ 998{
995 // force a connection every now and when when packets are sent (max 1/s) 999 // force a connection every now and when when packets are sent (max 1/s)
996 if (ev_now () - last_establish_attempt >= 0.95) // arbitrary 1000 if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
997 establish_connection.stop (); 1001 establish_connection.stop ();
998 1002
999 establish_connection (); 1003 establish_connection ();
1000} 1004}
1001 1005
… …
1061 // about our desire for communication. 1065 // about our desire for communication.
1062 establish_connection (); 1066 establish_connection ();
1063 break; 1067 break;
1064 1068
1065 case vpn_packet::PT_RESET: 1069 case vpn_packet::PT_RESET:
1070 slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
1071
1072 if (ictx && octx)
1066 { 1073 {
1067 reset_connection (); 1074 reset_connection ("remote reset");
1068 1075
1069 config_packet *p = (config_packet *) pkt; 1076 config_packet *p = (config_packet *) pkt;
1070 1077
1071 if (!p->chk_config ()) 1078 if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
1072 {
1073 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
1074 conf->nodename, (const char *)rsi);
1075 connectmode = conf_node::C_DISABLED;
1076 }
1077 else if (connectmode == conf_node::C_ALWAYS)
1078 establish_connection (); 1079 establish_connection ();
1079 } 1080 }
1081
1080 break; 1082 break;
1081 1083
1082 case vpn_packet::PT_AUTH_REQ: 1084 case vpn_packet::PT_AUTH_REQ:
1083 if (auth_rate_limiter.can (rsi)) 1085 if (auth_rate_limiter.can (rsi))
1084 { 1086 {
… …
1086 1088
1087 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", 1089 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
1088 conf->nodename, p->initiate ? "initiate" : "reply", 1090 conf->nodename, p->initiate ? "initiate" : "reply",
1089 p->protocols, p->features); 1091 p->protocols, p->features);
1090 1092
1091 if (p->chk_config () && !memcmp (p->magic, MAGIC, 8)) 1093 if (memcmp (p->magic, MAGIC, 8))
1094 {
1095 slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
1096 conf->nodename, (const char *)rsi);
1097 }
1098 else if (p->chk_config (conf, rsi))
1092 { 1099 {
1093 if (p->prot_minor != PROTOCOL_MINOR) 1100 if (p->prot_minor != PROTOCOL_MINOR)
1094 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1101 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1095 conf->nodename, (const char *)rsi, 1102 conf->nodename, (const char *)rsi,
1096 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 1103 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1097 1104
1098 if (p->initiate) 1105 if (p->initiate)
1106 {
1099 send_auth_request (rsi, false); 1107 send_auth_request (rsi, false);
1108
1109 if (ictx && octx)
1110 reset_connection ("reconnect");
1111 }
1100 1112
1101 auth_data auth; 1113 auth_data auth;
1102 1114
1103 if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) 1115 if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
1104 { 1116 {
1105 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), 1117 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
1106 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); 1118 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
1107 } 1119 }
1108 else 1120 else
1109 { 1121 {
1110 bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth); 1122 bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
1111 1123
1112 rcv_auth = auth; 1124 rcv_auth = auth;
1113 have_rcv_auth = true; 1125 have_rcv_auth = true;
1114 1126
1115 send_auth_response (rsi); 1127 send_auth_response (rsi);
… …
1123 } 1135 }
1124 } 1136 }
1125 1137
1126 break; 1138 break;
1127 } 1139 }
1128 else
1129 slog (L_WARN, _("%s(%s): protocol mismatch."),
1130 conf->nodename, (const char *)rsi);
1131 1140
1132 send_reset (rsi); 1141 send_reset (rsi);
1133 } 1142 }
1134 1143
1135 break; 1144 break;
… …
1138 { 1147 {
1139 auth_res_packet *p = (auth_res_packet *)pkt; 1148 auth_res_packet *p = (auth_res_packet *)pkt;
1140 1149
1141 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); 1150 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
1142 1151
1143 if (p->chk_config ()) 1152 auth_mac local_mac;
1153 auth_hash (snd_auth, p->response.ecdh, local_mac);
1154
1155 if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
1144 { 1156 {
1145 if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
1146 {
1147 slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), 1157 slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1148 conf->nodename, (const char *)rsi); 1158 conf->nodename, (const char *)rsi);
1149 } 1159 }
1150 else if (!have_snd_auth) 1160 else if (!have_snd_auth)
1151 { 1161 {
1152 if (p->prot_minor != PROTOCOL_MINOR)
1153 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1154 conf->nodename, (const char *)rsi,
1155 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1156
1157 prot_minor = p->prot_minor;
1158 memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b)); 1162 memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1159 1163
1160 have_snd_auth = true; 1164 have_snd_auth = true;
1161 connection_established (rsi); 1165 connection_established (rsi);
1162 }
1163
1164 break;
1165 } 1166 }
1166 } 1167 }
1167
1168 send_reset (rsi);
1169 break; 1168 break;
1170 1169
1171 case vpn_packet::PT_DATA_COMPRESSED: 1170 case vpn_packet::PT_DATA_COMPRESSED:
1172#if !ENABLE_COMPRESSION 1171#if !ENABLE_COMPRESSION
1173 send_reset (rsi); 1172 send_reset (rsi);
… …
1179 if (ictx && octx) 1178 if (ictx && octx)
1180 { 1179 {
1181 vpndata_packet *p = (vpndata_packet *)pkt; 1180 vpndata_packet *p = (vpndata_packet *)pkt;
1182 1181
1183 if (!p->hmac_chk (ictx)) 1182 if (!p->hmac_chk (ictx))
1183 {
1184 // rekeying often creates temporary hmac auth floods
1185 // we assume they don't take longer than a few seconds normally,
1186 // and suppress messages and resets during that time.
1187 //TODO: should be done per source address
1188 if (!hmac_error)
1189 {
1190 hmac_error = ev_now () + 3;
1191 break;
1192 }
1193 else if (hmac_error >= ev_now ())
1194 break; // silently suppress
1195 else
1196 {
1184 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1197 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1185 "could be an attack, or just corruption or a synchronization error."), 1198 "could be an attack, or just corruption or a synchronization error."),
1186 conf->nodename, (const char *)rsi); 1199 conf->nodename, (const char *)rsi);
1200 // reset
1201 }
1202 }
1187 else 1203 else
1188 { 1204 {
1189 u32 seqno; 1205 u32 seqno;
1190 tap_packet *d = p->unpack (this, seqno); 1206 tap_packet *d = p->unpack (this, seqno);
1191 int seqclass = iseqno.seqno_classify (seqno); 1207 int seqclass = iseqno.seqno_classify (seqno);
1208
1209 hmac_error = 0;
1192 1210
1193 if (seqclass == 0) // ok 1211 if (seqclass == 0) // ok
1194 { 1212 {
1195 vpn->tap->send (d); 1213 vpn->tap->send (d);
1196 1214
… …
1323 1341
1324 if (when >= 0) 1342 if (when >= 0)
1325 w.start (when); 1343 w.start (when);
1326 else if (when < -15) 1344 else if (when < -15)
1327 { 1345 {
1328 reset_connection (); 1346 reset_connection ("keepalive overdue");
1329 establish_connection (); 1347 establish_connection ();
1330 } 1348 }
1331 else if (conf->connectmode != conf_node::C_ONDEMAND 1349 else if (conf->connectmode != conf_node::C_ONDEMAND
1332 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1350 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1333 { 1351 {
… …
1337 else if (when >= -10) 1355 else if (when >= -10)
1338 // hold ondemand connections implicitly a few seconds longer 1356 // hold ondemand connections implicitly a few seconds longer
1339 // should delete octx, though, or something like that ;) 1357 // should delete octx, though, or something like that ;)
1340 w.start (when + 10); 1358 w.start (when + 10);
1341 else 1359 else
1342 reset_connection (); 1360 reset_connection ("keepalive timeout");
1343} 1361}
1344 1362
1345void 1363void
1346connection::send_connect_request (int id) 1364connection::send_connect_request (int id)
1347{ 1365{
… …
1447 1465
1448 // queue a dummy packet to force an initial connection attempt 1466 // queue a dummy packet to force an initial connection attempt
1449 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) 1467 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1450 vpn_queue.put (new net_packet); 1468 vpn_queue.put (new net_packet);
1451 1469
1452 reset_connection (); 1470 reset_connection ("startup");
1453} 1471}
1454 1472
1455connection::~connection () 1473connection::~connection ()
1456{ 1474{
1457 shutdown (); 1475 shutdown ();

Diff Legend

– Removed lines
+ Added lines
< Changed lines
> Changed lines