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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 1.31 by pcg, Sun Feb 8 07:24:25 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.
… …
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 17 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17*/ 18*/
18 19
19#include "config.h" 20#include "config.h"
20 21
21extern "C" { 22#include <cassert>
22# include "lzf/lzf.h"
23}
24 23
25#include <list> 24#include <list>
26 25
27#include <openssl/rand.h> 26#include <openssl/rand.h>
28#include <openssl/evp.h> 27#include <openssl/evp.h>
… …
35#include "slog.h" 34#include "slog.h"
36#include "device.h" 35#include "device.h"
37#include "vpn.h" 36#include "vpn.h"
38#include "connection.h" 37#include "connection.h"
39 38
39#include "netcompat.h"
40
40#if !HAVE_RAND_PSEUDO_BYTES 41#if !HAVE_RAND_PSEUDO_BYTES
41# define RAND_pseudo_bytes RAND_bytes 42# define RAND_pseudo_bytes RAND_bytes
42#endif 43#endif
43 44
44#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 45#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
45 46
47#define ULTRA_FAST 1
48#define HLOG 15
49#include "lzf/lzf.h"
50#include "lzf/lzf_c.c"
51#include "lzf/lzf_d.c"
52
46struct crypto_ctx 53struct crypto_ctx
47{ 54{
48 EVP_CIPHER_CTX cctx; 55 EVP_CIPHER_CTX cctx;
49 HMAC_CTX hctx; 56 HMAC_CTX hctx;
50 57
… …
53}; 60};
54 61
55crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) 62crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
56{ 63{
57 EVP_CIPHER_CTX_init (&cctx); 64 EVP_CIPHER_CTX_init (&cctx);
58 EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); 65 require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
59 HMAC_CTX_init (&hctx); 66 HMAC_CTX_init (&hctx);
60 HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); 67 HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61} 68}
62 69
63crypto_ctx::~crypto_ctx () 70crypto_ctx::~crypto_ctx ()
64{ 71{
65 EVP_CIPHER_CTX_cleanup (&cctx); 72 require (EVP_CIPHER_CTX_cleanup (&cctx));
66 HMAC_CTX_cleanup (&hctx); 73 HMAC_CTX_cleanup (&hctx);
67} 74}
68 75
69static void 76static void
70rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) 77rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
71{ 78{
72 EVP_MD_CTX ctx; 79 EVP_MD_CTX ctx;
73 80
74 EVP_MD_CTX_init (&ctx); 81 EVP_MD_CTX_init (&ctx);
75 EVP_DigestInit (&ctx, RSA_HASH); 82 require (EVP_DigestInit (&ctx, RSA_HASH));
76 EVP_DigestUpdate(&ctx, &chg, sizeof chg); 83 require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
77 EVP_DigestUpdate(&ctx, &id, sizeof id); 84 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
78 EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); 85 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
79 EVP_MD_CTX_cleanup (&ctx); 86 EVP_MD_CTX_cleanup (&ctx);
80} 87}
81 88
82struct rsa_entry { 89struct rsa_entry {
83 tstamp expire; 90 tstamp expire;
… …
131 138
132} rsa_cache; 139} rsa_cache;
133 140
134void rsa_cache::cleaner_cb (time_watcher &w) 141void rsa_cache::cleaner_cb (time_watcher &w)
135{ 142{
136 if (empty ()) 143 if (!empty ())
137 w.at = TSTAMP_CANCEL;
138 else
139 { 144 {
140 w.at = NOW + RSA_TTL; 145 w.start (NOW + RSA_TTL);
141 146
142 for (iterator i = begin (); i != end (); ) 147 for (iterator i = begin (); i != end (); )
143 if (i->expire <= NOW) 148 if (i->expire <= NOW)
144 i = erase (i); 149 i = erase (i);
145 else 150 else
… …
307} 312}
308 313
309#define MAXVPNDATA (MAX_MTU - 6 - 6) 314#define MAXVPNDATA (MAX_MTU - 6 - 6)
310#define DATAHDR (sizeof (u32) + RAND_SIZE) 315#define DATAHDR (sizeof (u32) + RAND_SIZE)
311 316
312struct vpndata_packet:vpn_packet 317struct vpndata_packet : vpn_packet
313 { 318 {
314 u8 data[MAXVPNDATA + DATAHDR]; // seqno 319 u8 data[MAXVPNDATA + DATAHDR]; // seqno
315 320
316 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); 321 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
317 tap_packet *unpack (connection *conn, u32 &seqno); 322 tap_packet *unpack (connection *conn, u32 &seqno);
… …
330 int outl = 0, outl2; 335 int outl = 0, outl2;
331 ptype type = PT_DATA_UNCOMPRESSED; 336 ptype type = PT_DATA_UNCOMPRESSED;
332 337
333#if ENABLE_COMPRESSION 338#if ENABLE_COMPRESSION
334 u8 cdata[MAX_MTU]; 339 u8 cdata[MAX_MTU];
335 u32 cl;
336 340
341 if (conn->features & ENABLE_COMPRESSION)
342 {
337 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 343 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344
338 if (cl) 345 if (cl)
339 { 346 {
340 type = PT_DATA_COMPRESSED; 347 type = PT_DATA_COMPRESSED;
341 d = cdata; 348 d = cdata;
342 l = cl + 2; 349 l = cl + 2;
343 350
344 d[0] = cl >> 8; 351 d[0] = cl >> 8;
345 d[1] = cl; 352 d[1] = cl;
353 }
346 } 354 }
347#endif 355#endif
348 356
349 EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); 357 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
350 358
351 struct { 359 struct {
352#if RAND_SIZE 360#if RAND_SIZE
353 u8 rnd[RAND_SIZE]; 361 u8 rnd[RAND_SIZE];
354#endif 362#endif
… …
358 datahdr.seqno = ntohl (seqno); 366 datahdr.seqno = ntohl (seqno);
359#if RAND_SIZE 367#if RAND_SIZE
360 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); 368 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
361#endif 369#endif
362 370
363 EVP_EncryptUpdate (cctx, 371 require (EVP_EncryptUpdate (cctx,
364 (unsigned char *) data + outl, &outl2, 372 (unsigned char *) data + outl, &outl2,
365 (unsigned char *) &datahdr, DATAHDR); 373 (unsigned char *) &datahdr, DATAHDR));
366 outl += outl2; 374 outl += outl2;
367 375
368 EVP_EncryptUpdate (cctx, 376 require (EVP_EncryptUpdate (cctx,
369 (unsigned char *) data + outl, &outl2, 377 (unsigned char *) data + outl, &outl2,
370 (unsigned char *) d, l); 378 (unsigned char *) d, l));
371 outl += outl2; 379 outl += outl2;
372 380
373 EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); 381 require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374 outl += outl2; 382 outl += outl2;
375 383
376 len = outl + data_hdr_size (); 384 len = outl + data_hdr_size ();
377 385
378 set_hdr (type, dst); 386 set_hdr (type, dst);
… …
387 int outl = 0, outl2; 395 int outl = 0, outl2;
388 tap_packet *p = new tap_packet; 396 tap_packet *p = new tap_packet;
389 u8 *d; 397 u8 *d;
390 u32 l = len - data_hdr_size (); 398 u32 l = len - data_hdr_size ();
391 399
392 EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); 400 require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
393 401
394#if ENABLE_COMPRESSION 402#if ENABLE_COMPRESSION
395 u8 cdata[MAX_MTU]; 403 u8 cdata[MAX_MTU];
396 404
397 if (type == PT_DATA_COMPRESSED) 405 if (type == PT_DATA_COMPRESSED)
… …
399 else 407 else
400#endif 408#endif
401 d = &(*p)[6 + 6 - DATAHDR]; 409 d = &(*p)[6 + 6 - DATAHDR];
402 410
403 /* this overwrites part of the src mac, but we fix that later */ 411 /* this overwrites part of the src mac, but we fix that later */
404 EVP_DecryptUpdate (cctx, 412 require (EVP_DecryptUpdate (cctx,
405 d, &outl2, 413 d, &outl2,
406 (unsigned char *)&data, len - data_hdr_size ()); 414 (unsigned char *)&data, len - data_hdr_size ()));
407 outl += outl2; 415 outl += outl2;
408 416
409 EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); 417 require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410 outl += outl2; 418 outl += outl2;
411 419
412 seqno = ntohl (*(u32 *)(d + RAND_SIZE)); 420 seqno = ntohl (*(u32 *)(d + RAND_SIZE));
413 421
414 id2mac (dst () ? dst() : THISNODE->id, p->dst); 422 id2mac (dst () ? dst() : THISNODE->id, p->dst);
… …
443{ 451{
444 // actually, hmaclen cannot be checked because the hmac 452 // actually, hmaclen cannot be checked because the hmac
445 // field comes before this data, so peers with other 453 // field comes before this data, so peers with other
446 // hmacs simply will not work. 454 // hmacs simply will not work.
447 u8 prot_major, prot_minor, randsize, hmaclen; 455 u8 prot_major, prot_minor, randsize, hmaclen;
448 u8 flags, challengelen, pad2, pad3; 456 u8 flags, challengelen, features, pad3;
449 u32 cipher_nid, digest_nid, hmac_nid; 457 u32 cipher_nid, digest_nid, hmac_nid;
450
451 const u8 curflags () const
452 {
453 return 0x80
454 | (ENABLE_COMPRESSION ? 0x01 : 0x00);
455 }
456 458
457 void setup (ptype type, int dst); 459 void setup (ptype type, int dst);
458 bool chk_config () const; 460 bool chk_config () const;
459}; 461};
462
463#define FEATURES ((ENABLE_COMPRESSION ? FEATURE_COMPRESSION : 0) \
464 | (ENABLE_ROHC ? FEATURE_ROHC : 0))
460 465
461void config_packet::setup (ptype type, int dst) 466void config_packet::setup (ptype type, int dst)
462{ 467{
463 prot_major = PROTOCOL_MAJOR; 468 prot_major = PROTOCOL_MAJOR;
464 prot_minor = PROTOCOL_MINOR; 469 prot_minor = PROTOCOL_MINOR;
465 randsize = RAND_SIZE; 470 randsize = RAND_SIZE;
466 hmaclen = HMACLENGTH; 471 hmaclen = HMACLENGTH;
467 flags = curflags (); 472 flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
468 challengelen = sizeof (rsachallenge); 473 challengelen = sizeof (rsachallenge);
474 features = FEATURES;
469 475
470 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 476 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
471 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 477 digest_nid = htonl (EVP_MD_type (RSA_HASH));
472 hmac_nid = htonl (EVP_MD_type (DIGEST)); 478 hmac_nid = htonl (EVP_MD_type (DIGEST));
473 479
… …
476} 482}
477 483
478bool config_packet::chk_config () const 484bool config_packet::chk_config () const
479{ 485{
480 if (prot_major != PROTOCOL_MAJOR) 486 if (prot_major != PROTOCOL_MAJOR)
481 slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); 487 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
482 else if (randsize != RAND_SIZE) 488 else if (randsize != RAND_SIZE)
483 slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); 489 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
484 else if (hmaclen != HMACLENGTH) 490 else if (hmaclen != HMACLENGTH)
485 slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); 491 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
492#if 0 // this implementation should handle all flag settings
486 else if (flags != curflags ()) 493 else if (flags != curflags ())
487 slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); 494 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
495#endif
488 else if (challengelen != sizeof (rsachallenge)) 496 else if (challengelen != sizeof (rsachallenge))
489 slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); 497 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
490 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 498 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
491 slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 499 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))) 500 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)); 501 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))) 502 else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
495 slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); 503 slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
496 else 504 else
497 return true; 505 return true;
498 506
499 return false; 507 return false;
500} 508}
501 509
502struct auth_req_packet : config_packet 510struct auth_req_packet : config_packet
503{ 511{
504 char magic[8]; 512 char magic[8];
505 u8 initiate; // false if this is just an automatic reply 513 u8 initiate; // false if this is just an automatic reply
506 u8 protocols; // supported protocols (will get patches on forward) 514 u8 protocols; // supported protocols (will be patched on forward)
507 u8 pad2, pad3; 515 u8 pad2, pad3;
508 rsaid id; 516 rsaid id;
509 rsaencrdata encr; 517 rsaencrdata encr;
510 518
511 auth_req_packet (int dst, bool initiate_, u8 protocols_) 519 auth_req_packet (int dst, bool initiate_, u8 protocols_)
… …
595 } 603 }
596 else 604 else
597 { 605 {
598 retry_cnt = 0; 606 retry_cnt = 0;
599 establish_connection.start (NOW + 5); 607 establish_connection.start (NOW + 5);
600 keepalive.reset (); 608 keepalive.stop ();
601 rekey.reset (); 609 rekey.stop ();
602 } 610 }
603} 611}
604 612
605void 613void
606connection::reset_si () 614connection::reset_si ()
… …
672connection::send_auth_request (const sockinfo &si, bool initiate) 680connection::send_auth_request (const sockinfo &si, bool initiate)
673{ 681{
674 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); 682 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
675 683
676 rsachallenge chg; 684 rsachallenge chg;
677
678 rsa_cache.gen (pkt->id, chg); 685 rsa_cache.gen (pkt->id, chg);
679 686 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");
684 687
685 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 688 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
686 689
687 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 690 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
688 691
… …
722} 725}
723 726
724void 727void
725connection::establish_connection_cb (time_watcher &w) 728connection::establish_connection_cb (time_watcher &w)
726{ 729{
727 if (ictx || conf == THISNODE 730 if (!ictx
731 && conf != THISNODE
728 || connectmode == conf_node::C_NEVER 732 && connectmode != conf_node::C_NEVER
729 || connectmode == conf_node::C_DISABLED) 733 && connectmode != conf_node::C_DISABLED
730 w.at = TSTAMP_CANCEL; 734 && NOW > w.at)
731 else if (w.at <= NOW)
732 { 735 {
733 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 736 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
734 737
735 if (retry_int < 3600 * 8) 738 if (retry_int < 3600 * 8)
736 retry_cnt++; 739 retry_cnt++;
737 740
738 w.at = NOW + retry_int; 741 w.start (NOW + retry_int);
739 742
740 reset_si (); 743 reset_si ();
741 744
742 if (si.prot && !si.host) 745 if (si.prot && !si.host)
743 vpn->send_connect_request (conf->id); 746 vpn->send_connect_request (conf->id);
… …
774 si.host= 0; 777 si.host= 0;
775 778
776 last_activity = 0; 779 last_activity = 0;
777 retry_cnt = 0; 780 retry_cnt = 0;
778 781
779 rekey.reset (); 782 rekey.stop ();
780 keepalive.reset (); 783 keepalive.stop ();
781 establish_connection.reset (); 784 establish_connection.stop ();
782} 785}
783 786
784void 787void
785connection::shutdown () 788connection::shutdown ()
786{ 789{
… …
791} 794}
792 795
793void 796void
794connection::rekey_cb (time_watcher &w) 797connection::rekey_cb (time_watcher &w)
795{ 798{
796 w.at = TSTAMP_CANCEL;
797
798 reset_connection (); 799 reset_connection ();
799 establish_connection (); 800 establish_connection ();
800} 801}
801 802
802void 803void
803connection::send_data_packet (tap_packet *pkt, bool broadcast) 804connection::send_data_packet (tap_packet *pkt)
804{ 805{
805 vpndata_packet *p = new vpndata_packet; 806 vpndata_packet *p = new vpndata_packet;
806 int tos = 0; 807 int tos = 0;
807 808
808 // I am not hilarious about peeking into packets, but so be it. 809 // I am not hilarious about peeking into packets, but so be it.
809 if (conf->inherit_tos 810 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; 811 tos = (*pkt)[15] & IPTOS_TOS_MASK;
813 812
814 p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs 813 p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815 send_vpn_packet (p, si, tos); 814 send_vpn_packet (p, si, tos);
816 815
817 delete p; 816 delete p;
818 817
819 if (oseqno > MAX_SEQNO) 818 if (oseqno > MAX_SEQNO)
820 rekey (); 819 rekey ();
821} 820}
822 821
823void 822void
824connection::inject_data_packet (tap_packet *pkt, bool broadcast) 823connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)
825{ 824{
826 if (ictx && octx) 825 if (ictx && octx)
827 send_data_packet (pkt, broadcast); 826 send_data_packet (pkt);
828 else 827 else
829 { 828 {
830 if (!broadcast)//DDDD 829 if (!broadcast)//DDDD
831 data_queue.put (new tap_packet (*pkt)); 830 data_queue.put (new tap_packet (*pkt));
832 831
… …
838{ 837{
839 if (ictx && octx) 838 if (ictx && octx)
840 send_vpn_packet (pkt, si, tos); 839 send_vpn_packet (pkt, si, tos);
841 else 840 else
842 { 841 {
843 vpn_queue.put (new vpn_packet (*pkt)); 842 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
844 843
845 establish_connection (); 844 establish_connection ();
846 } 845 }
847} 846}
848 847
… …
907 if (p->initiate) 906 if (p->initiate)
908 send_auth_request (rsi, false); 907 send_auth_request (rsi, false);
909 908
910 rsachallenge k; 909 rsachallenge k;
911 910
912 if (0 > RSA_private_decrypt (sizeof (p->encr), 911 if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
913 (unsigned char *)&p->encr, (unsigned char *)&k, 912 {
914 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), 913 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)); 914 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
915 break;
916 }
917 else 917 else
918 { 918 {
919 delete octx; 919 delete octx;
920 920
921 octx = new crypto_ctx (k, 1); 921 octx = new crypto_ctx (k, 1);
922 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 922 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
923 923
924 // compatibility code, remove when no longer required
925 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
926
924 conf->protocols = p->protocols; 927 conf->protocols = p->protocols;
928 features = p->features & FEATURES;
925 929
926 send_auth_response (rsi, p->id, k); 930 send_auth_response (rsi, p->id, k);
927 931
928 connection_established (); 932 connection_established ();
929 933
… …
954 958
955 rsachallenge chg; 959 rsachallenge chg;
956 960
957 if (!rsa_cache.find (p->id, chg)) 961 if (!rsa_cache.find (p->id, chg))
958 { 962 {
959 slog (L_ERR, _("%s(%s): unrequested auth response"), 963 slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
960 conf->nodename, (const char *)rsi); 964 conf->nodename, (const char *)rsi);
961 break; 965 break;
962 } 966 }
963 else 967 else
964 { 968 {
965 crypto_ctx *cctx = new crypto_ctx (chg, 0); 969 crypto_ctx *cctx = new crypto_ctx (chg, 0);
966 970
967 if (!p->hmac_chk (cctx)) 971 if (!p->hmac_chk (cctx))
972 {
968 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 973 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"), 974 "could be an attack, or just corruption or a synchronization error"),
970 conf->nodename, (const char *)rsi); 975 conf->nodename, (const char *)rsi);
976 break;
977 }
971 else 978 else
972 { 979 {
973 rsaresponse h; 980 rsaresponse h;
974 981
975 rsa_hash (p->id, chg, h); 982 rsa_hash (p->id, chg, h);
… …
1021 { 1028 {
1022 vpndata_packet *p = (vpndata_packet *)pkt; 1029 vpndata_packet *p = (vpndata_packet *)pkt;
1023 1030
1024 if (!p->hmac_chk (ictx)) 1031 if (!p->hmac_chk (ictx))
1025 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1032 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026 "could be an attack, or just corruption or an synchronization error"), 1033 "could be an attack, or just corruption or a synchronization error"),
1027 conf->nodename, (const char *)rsi); 1034 conf->nodename, (const char *)rsi);
1028 else 1035 else
1029 { 1036 {
1030 u32 seqno; 1037 u32 seqno;
1031 tap_packet *d = p->unpack (this, seqno); 1038 tap_packet *d = p->unpack (this, seqno);
1032 1039
1033 if (iseqno.recv_ok (seqno)) 1040 if (iseqno.recv_ok (seqno))
1034 { 1041 {
1035 vpn->tap->send (d); 1042 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 1043
1046 if (si != rsi) 1044 if (si != rsi)
1047 { 1045 {
1048 // fast re-sync on connection changes, useful especially for tcp/ip 1046 // fast re-sync on connection changes, useful especially for tcp/ip
1049 si = rsi; 1047 si = rsi;
… …
1123 { 1121 {
1124 reset_connection (); 1122 reset_connection ();
1125 establish_connection (); 1123 establish_connection ();
1126 } 1124 }
1127 else if (NOW < last_activity + ::conf.keepalive) 1125 else if (NOW < last_activity + ::conf.keepalive)
1128 w.at = last_activity + ::conf.keepalive; 1126 w.start (last_activity + ::conf.keepalive);
1129 else if (conf->connectmode != conf_node::C_ONDEMAND 1127 else if (conf->connectmode != conf_node::C_ONDEMAND
1130 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1128 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1131 { 1129 {
1132 send_ping (si); 1130 send_ping (si);
1133 w.at = NOW + 5; 1131 w.start (NOW + 5);
1134 } 1132 }
1135 else if (NOW < last_activity + ::conf.keepalive + 10) 1133 else if (NOW < last_activity + ::conf.keepalive + 10)
1136 // hold ondemand connections implicitly a few seconds longer 1134 // hold ondemand connections implicitly a few seconds longer
1137 // should delete octx, though, or something like that ;) 1135 // should delete octx, though, or something like that ;)
1138 w.at = last_activity + ::conf.keepalive + 10; 1136 w.start (last_activity + ::conf.keepalive + 10);
1139 else 1137 else
1140 reset_connection (); 1138 reset_connection ();
1141} 1139}
1142 1140
1143void connection::send_connect_request (int id) 1141void connection::send_connect_request (int id)

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