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Comparing gvpe/src/connection.C (file contents):
Revision 1.20 by pcg, Tue Oct 14 15:48:15 2003 UTC vs.
Revision 1.41 by pcg, Wed Mar 2 05:49:31 2005 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
3 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>
… …
43# define RAND_pseudo_bytes RAND_bytes 42# define RAND_pseudo_bytes RAND_bytes
44#endif 43#endif
45 44
46#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 45#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
47 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
48struct crypto_ctx 53struct crypto_ctx
49{ 54{
50 EVP_CIPHER_CTX cctx; 55 EVP_CIPHER_CTX cctx;
51 HMAC_CTX hctx; 56 HMAC_CTX hctx;
52 57
… …
55}; 60};
56 61
57crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) 62crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
58{ 63{
59 EVP_CIPHER_CTX_init (&cctx); 64 EVP_CIPHER_CTX_init (&cctx);
60 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));
61 HMAC_CTX_init (&hctx); 66 HMAC_CTX_init (&hctx);
62 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);
63} 68}
64 69
65crypto_ctx::~crypto_ctx () 70crypto_ctx::~crypto_ctx ()
66{ 71{
67 EVP_CIPHER_CTX_cleanup (&cctx); 72 require (EVP_CIPHER_CTX_cleanup (&cctx));
68 HMAC_CTX_cleanup (&hctx); 73 HMAC_CTX_cleanup (&hctx);
69} 74}
70 75
71static void 76static void
72rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) 77rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
73{ 78{
74 EVP_MD_CTX ctx; 79 EVP_MD_CTX ctx;
75 80
76 EVP_MD_CTX_init (&ctx); 81 EVP_MD_CTX_init (&ctx);
77 EVP_DigestInit (&ctx, RSA_HASH); 82 require (EVP_DigestInit (&ctx, RSA_HASH));
78 EVP_DigestUpdate(&ctx, &chg, sizeof chg); 83 require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
79 EVP_DigestUpdate(&ctx, &id, sizeof id); 84 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
80 EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); 85 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
81 EVP_MD_CTX_cleanup (&ctx); 86 EVP_MD_CTX_cleanup (&ctx);
82} 87}
83 88
84struct rsa_entry { 89struct rsa_entry {
85 tstamp expire; 90 tstamp expire;
… …
133 138
134} rsa_cache; 139} rsa_cache;
135 140
136void rsa_cache::cleaner_cb (time_watcher &w) 141void rsa_cache::cleaner_cb (time_watcher &w)
137{ 142{
138 if (empty ()) 143 if (!empty ())
139 w.at = TSTAMP_CANCEL;
140 else
141 { 144 {
142 w.at = NOW + RSA_TTL; 145 w.start (NOW + RSA_TTL);
143 146
144 for (iterator i = begin (); i != end (); ) 147 for (iterator i = begin (); i != end (); )
145 if (i->expire <= NOW) 148 if (i->expire <= NOW)
146 i = erase (i); 149 i = erase (i);
147 else 150 else
… …
199// only do action once every x seconds per host whole allowing bursts. 202// only do action once every x seconds per host whole allowing bursts.
200// this implementation ("splay list" ;) is inefficient, 203// this implementation ("splay list" ;) is inefficient,
201// but low on resources. 204// but low on resources.
202struct net_rate_limiter : list<net_rateinfo> 205struct net_rate_limiter : list<net_rateinfo>
203{ 206{
204 static const double ALPHA = 1. - 1. / 600.; // allow bursts 207# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
205 static const double CUTOFF = 10.; // one event every CUTOFF seconds 208# define NRL_CUTOFF 10. // one event every CUTOFF seconds
206 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time 209# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
207 static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value 210# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
208 211
209 bool can (const sockinfo &si) { return can((u32)si.host); } 212 bool can (const sockinfo &si) { return can((u32)si.host); }
210 bool can (u32 host); 213 bool can (u32 host);
211}; 214};
212 215
… …
217 iterator i; 220 iterator i;
218 221
219 for (i = begin (); i != end (); ) 222 for (i = begin (); i != end (); )
220 if (i->host == host) 223 if (i->host == host)
221 break; 224 break;
222 else if (i->last < NOW - EXPIRE) 225 else if (i->last < NOW - NRL_EXPIRE)
223 i = erase (i); 226 i = erase (i);
224 else 227 else
225 i++; 228 i++;
226 229
227 if (i == end ()) 230 if (i == end ())
228 { 231 {
229 net_rateinfo ri; 232 net_rateinfo ri;
230 233
231 ri.host = host; 234 ri.host = host;
232 ri.pcnt = 1.; 235 ri.pcnt = 1.;
233 ri.diff = MAXDIF; 236 ri.diff = NRL_MAXDIF;
234 ri.last = NOW; 237 ri.last = NOW;
235 238
236 push_front (ri); 239 push_front (ri);
237 240
238 return true; 241 return true;
… …
240 else 243 else
241 { 244 {
242 net_rateinfo ri (*i); 245 net_rateinfo ri (*i);
243 erase (i); 246 erase (i);
244 247
245 ri.pcnt = ri.pcnt * ALPHA; 248 ri.pcnt = ri.pcnt * NRL_ALPHA;
246 ri.diff = ri.diff * ALPHA + (NOW - ri.last); 249 ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
247 250
248 ri.last = NOW; 251 ri.last = NOW;
249 252
250 double dif = ri.diff / ri.pcnt; 253 double dif = ri.diff / ri.pcnt;
251 254
252 bool send = dif > CUTOFF; 255 bool send = dif > NRL_CUTOFF;
253 256
254 if (dif > MAXDIF) 257 if (dif > NRL_MAXDIF)
255 { 258 {
256 ri.pcnt = 1.; 259 ri.pcnt = 1.;
257 ri.diff = MAXDIF; 260 ri.diff = NRL_MAXDIF;
258 } 261 }
259 else if (send) 262 else if (send)
260 ri.pcnt++; 263 ri.pcnt++;
261 264
262 push_front (ri); 265 push_front (ri);
… …
309} 312}
310 313
311#define MAXVPNDATA (MAX_MTU - 6 - 6) 314#define MAXVPNDATA (MAX_MTU - 6 - 6)
312#define DATAHDR (sizeof (u32) + RAND_SIZE) 315#define DATAHDR (sizeof (u32) + RAND_SIZE)
313 316
314struct vpndata_packet:vpn_packet 317struct vpndata_packet : vpn_packet
315 { 318 {
316 u8 data[MAXVPNDATA + DATAHDR]; // seqno 319 u8 data[MAXVPNDATA + DATAHDR]; // seqno
317 320
318 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);
319 tap_packet *unpack (connection *conn, u32 &seqno); 322 tap_packet *unpack (connection *conn, u32 &seqno);
… …
332 int outl = 0, outl2; 335 int outl = 0, outl2;
333 ptype type = PT_DATA_UNCOMPRESSED; 336 ptype type = PT_DATA_UNCOMPRESSED;
334 337
335#if ENABLE_COMPRESSION 338#if ENABLE_COMPRESSION
336 u8 cdata[MAX_MTU]; 339 u8 cdata[MAX_MTU];
337 u32 cl;
338 340
341 if (conn->features & ENABLE_COMPRESSION)
342 {
339 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 343 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344
340 if (cl) 345 if (cl)
341 { 346 {
342 type = PT_DATA_COMPRESSED; 347 type = PT_DATA_COMPRESSED;
343 d = cdata; 348 d = cdata;
344 l = cl + 2; 349 l = cl + 2;
345 350
346 d[0] = cl >> 8; 351 d[0] = cl >> 8;
347 d[1] = cl; 352 d[1] = cl;
353 }
348 } 354 }
349#endif 355#endif
350 356
351 EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); 357 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
352 358
353 struct { 359 struct {
354#if RAND_SIZE 360#if RAND_SIZE
355 u8 rnd[RAND_SIZE]; 361 u8 rnd[RAND_SIZE];
356#endif 362#endif
… …
360 datahdr.seqno = ntohl (seqno); 366 datahdr.seqno = ntohl (seqno);
361#if RAND_SIZE 367#if RAND_SIZE
362 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); 368 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
363#endif 369#endif
364 370
365 EVP_EncryptUpdate (cctx, 371 require (EVP_EncryptUpdate (cctx,
366 (unsigned char *) data + outl, &outl2, 372 (unsigned char *) data + outl, &outl2,
367 (unsigned char *) &datahdr, DATAHDR); 373 (unsigned char *) &datahdr, DATAHDR));
368 outl += outl2; 374 outl += outl2;
369 375
370 EVP_EncryptUpdate (cctx, 376 require (EVP_EncryptUpdate (cctx,
371 (unsigned char *) data + outl, &outl2, 377 (unsigned char *) data + outl, &outl2,
372 (unsigned char *) d, l); 378 (unsigned char *) d, l));
373 outl += outl2; 379 outl += outl2;
374 380
375 EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); 381 require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
376 outl += outl2; 382 outl += outl2;
377 383
378 len = outl + data_hdr_size (); 384 len = outl + data_hdr_size ();
379 385
380 set_hdr (type, dst); 386 set_hdr (type, dst);
… …
389 int outl = 0, outl2; 395 int outl = 0, outl2;
390 tap_packet *p = new tap_packet; 396 tap_packet *p = new tap_packet;
391 u8 *d; 397 u8 *d;
392 u32 l = len - data_hdr_size (); 398 u32 l = len - data_hdr_size ();
393 399
394 EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); 400 require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
395 401
396#if ENABLE_COMPRESSION 402#if ENABLE_COMPRESSION
397 u8 cdata[MAX_MTU]; 403 u8 cdata[MAX_MTU];
398 404
399 if (type == PT_DATA_COMPRESSED) 405 if (type == PT_DATA_COMPRESSED)
… …
401 else 407 else
402#endif 408#endif
403 d = &(*p)[6 + 6 - DATAHDR]; 409 d = &(*p)[6 + 6 - DATAHDR];
404 410
405 /* 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 */
406 EVP_DecryptUpdate (cctx, 412 require (EVP_DecryptUpdate (cctx,
407 d, &outl2, 413 d, &outl2,
408 (unsigned char *)&data, len - data_hdr_size ()); 414 (unsigned char *)&data, len - data_hdr_size ()));
409 outl += outl2; 415 outl += outl2;
410 416
411 EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); 417 require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
412 outl += outl2; 418 outl += outl2;
413 419
414 seqno = ntohl (*(u32 *)(d + RAND_SIZE)); 420 seqno = ntohl (*(u32 *)(d + RAND_SIZE));
415 421
416 id2mac (dst () ? dst() : THISNODE->id, p->dst); 422 id2mac (dst () ? dst() : THISNODE->id, p->dst);
… …
445{ 451{
446 // actually, hmaclen cannot be checked because the hmac 452 // actually, hmaclen cannot be checked because the hmac
447 // field comes before this data, so peers with other 453 // field comes before this data, so peers with other
448 // hmacs simply will not work. 454 // hmacs simply will not work.
449 u8 prot_major, prot_minor, randsize, hmaclen; 455 u8 prot_major, prot_minor, randsize, hmaclen;
450 u8 flags, challengelen, pad2, pad3; 456 u8 flags, challengelen, features, pad3;
451 u32 cipher_nid, digest_nid, hmac_nid; 457 u32 cipher_nid, digest_nid, hmac_nid;
452
453 const u8 curflags () const
454 {
455 return 0x80
456 | (ENABLE_COMPRESSION ? 0x01 : 0x00);
457 }
458 458
459 void setup (ptype type, int dst); 459 void setup (ptype type, int dst);
460 bool chk_config () const; 460 bool chk_config () const;
461
462 static u8 get_features ()
463 {
464 u8 f = 0;
465#if ENABLE_COMPRESSION
466 f |= FEATURE_COMPRESSION;
467#endif
468#if ENABLE_ROHC
469 f |= FEATURE_ROHC;
470#endif
471 return f;
472 }
461}; 473};
462 474
463void config_packet::setup (ptype type, int dst) 475void config_packet::setup (ptype type, int dst)
464{ 476{
465 prot_major = PROTOCOL_MAJOR; 477 prot_major = PROTOCOL_MAJOR;
466 prot_minor = PROTOCOL_MINOR; 478 prot_minor = PROTOCOL_MINOR;
467 randsize = RAND_SIZE; 479 randsize = RAND_SIZE;
468 hmaclen = HMACLENGTH; 480 hmaclen = HMACLENGTH;
469 flags = curflags (); 481 flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
470 challengelen = sizeof (rsachallenge); 482 challengelen = sizeof (rsachallenge);
483 features = get_features ();
471 484
472 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 485 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
473 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 486 digest_nid = htonl (EVP_MD_type (RSA_HASH));
474 hmac_nid = htonl (EVP_MD_type (DIGEST)); 487 hmac_nid = htonl (EVP_MD_type (DIGEST));
475 488
… …
478} 491}
479 492
480bool config_packet::chk_config () const 493bool config_packet::chk_config () const
481{ 494{
482 if (prot_major != PROTOCOL_MAJOR) 495 if (prot_major != PROTOCOL_MAJOR)
483 slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); 496 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
484 else if (randsize != RAND_SIZE) 497 else if (randsize != RAND_SIZE)
485 slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); 498 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
486 else if (hmaclen != HMACLENGTH) 499 else if (hmaclen != HMACLENGTH)
487 slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); 500 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501#if 0 // this implementation should handle all flag settings
488 else if (flags != curflags ()) 502 else if (flags != curflags ())
489 slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); 503 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504#endif
490 else if (challengelen != sizeof (rsachallenge)) 505 else if (challengelen != sizeof (rsachallenge))
491 slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); 506 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
492 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 507 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
493 slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 508 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
494 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 509 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
495 slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); 510 slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
496 else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) 511 else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
497 slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); 512 slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
498 else 513 else
499 return true; 514 return true;
500 515
501 return false; 516 return false;
502} 517}
503 518
504struct auth_req_packet : config_packet 519struct auth_req_packet : config_packet
505{ 520{
506 char magic[8]; 521 char magic[8];
507 u8 initiate; // false if this is just an automatic reply 522 u8 initiate; // false if this is just an automatic reply
508 u8 protocols; // supported protocols (will get patches on forward) 523 u8 protocols; // supported protocols (will be patched on forward)
509 u8 pad2, pad3; 524 u8 pad2, pad3;
510 rsaid id; 525 rsaid id;
511 rsaencrdata encr; 526 rsaencrdata encr;
512 527
513 auth_req_packet (int dst, bool initiate_, u8 protocols_) 528 auth_req_packet (int dst, bool initiate_, u8 protocols_)
… …
574{ 589{
575 if (ictx && octx) 590 if (ictx && octx)
576 { 591 {
577 connectmode = conf->connectmode; 592 connectmode = conf->connectmode;
578 593
594 // make sure rekeying timeouts are slightly asymmetric
579 rekey.start (NOW + ::conf.rekey); 595 rekey.start (NOW + ::conf.rekey
596 + (conf->id > THISNODE->id ? 10 : 0));
580 keepalive.start (NOW + ::conf.keepalive); 597 keepalive.start (NOW + ::conf.keepalive);
581 598
582 // send queued packets 599 // send queued packets
583 if (ictx && octx) 600 if (ictx && octx)
584 { 601 {
… …
597 } 614 }
598 else 615 else
599 { 616 {
600 retry_cnt = 0; 617 retry_cnt = 0;
601 establish_connection.start (NOW + 5); 618 establish_connection.start (NOW + 5);
602 keepalive.reset (); 619 keepalive.stop ();
603 rekey.reset (); 620 rekey.stop ();
604 } 621 }
605} 622}
606 623
607void 624void
608connection::reset_si () 625connection::reset_si ()
… …
610 protocol = best_protocol (THISNODE->protocols & conf->protocols); 627 protocol = best_protocol (THISNODE->protocols & conf->protocols);
611 628
612 // mask out protocols we cannot establish 629 // mask out protocols we cannot establish
613 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 630 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
614 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 631 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
632 if (!conf->dns_port) protocol &= ~PROT_DNSv4;
615 633
616 si.set (conf, protocol); 634 si.set (conf, protocol);
617} 635}
618 636
619// ensure sockinfo is valid, forward if necessary 637// ensure sockinfo is valid, forward if necessary
… …
639} 657}
640 658
641void 659void
642connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 660connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
643{ 661{
644 if (!vpn->send_vpn_packet (pkt, si, tos)) 662 bool ok;
663
664 switch (si.prot)
665 {
666 case PROT_IPv4:
667 ok = vpn->send_ipv4_packet (pkt, si, tos); break;
668 case PROT_UDPv4:
669 ok = vpn->send_udpv4_packet (pkt, si, tos); break;
670#if ENABLE_TCP
671 case PROT_TCPv4:
672 ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
673#endif
674#if ENABLE_ICMP
675 case PROT_ICMPv4:
676 ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
677#endif
678#if ENABLE_DNS
679 case PROT_DNSv4:
680 ok = send_dnsv4_packet (pkt, si, tos); break;
681#endif
682
683 default:
684 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
685 ok = false;
686 }
687
688 if (!ok)
645 reset_connection (); 689 reset_connection ();
646} 690}
647 691
648void 692void
649connection::send_ping (const sockinfo &si, u8 pong) 693connection::send_ping (const sockinfo &si, u8 pong)
… …
674connection::send_auth_request (const sockinfo &si, bool initiate) 718connection::send_auth_request (const sockinfo &si, bool initiate)
675{ 719{
676 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); 720 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
677 721
678 rsachallenge chg; 722 rsachallenge chg;
679
680 rsa_cache.gen (pkt->id, chg); 723 rsa_cache.gen (pkt->id, chg);
681 724 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
682 if (0 > RSA_public_encrypt (sizeof chg,
683 (unsigned char *)&chg, (unsigned char *)&pkt->encr,
684 conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
685 fatal ("RSA_public_encrypt error");
686 725
687 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 726 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
688 727
689 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 728 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
690 729
… …
724} 763}
725 764
726void 765void
727connection::establish_connection_cb (time_watcher &w) 766connection::establish_connection_cb (time_watcher &w)
728{ 767{
729 if (ictx || conf == THISNODE 768 if (!ictx
769 && conf != THISNODE
730 || connectmode == conf_node::C_NEVER 770 && connectmode != conf_node::C_NEVER
731 || connectmode == conf_node::C_DISABLED) 771 && connectmode != conf_node::C_DISABLED
732 w.at = TSTAMP_CANCEL; 772 && NOW > w.at)
733 else if (w.at <= NOW)
734 { 773 {
735 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 774 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
736 775
737 if (retry_int < 3600 * 8) 776 if (retry_int < conf->max_retry)
738 retry_cnt++; 777 retry_cnt++;
778 else
779 retry_int = conf->max_retry;
739 780
740 w.at = NOW + retry_int; 781 w.start (NOW + retry_int);
741 782
742 reset_si (); 783 reset_si ();
743 784
744 if (si.prot && !si.host) 785 if (si.prot && !si.host)
745 vpn->send_connect_request (conf->id); 786 vpn->send_connect_request (conf->id);
… …
771 } 812 }
772 813
773 delete ictx; ictx = 0; 814 delete ictx; ictx = 0;
774 delete octx; octx = 0; 815 delete octx; octx = 0;
775 816
776 si.host= 0; 817 si.host = 0;
777 818
778 last_activity = 0; 819 last_activity = 0;
779 retry_cnt = 0; 820 retry_cnt = 0;
780 821
781 rekey.reset (); 822 rekey.stop ();
782 keepalive.reset (); 823 keepalive.stop ();
783 establish_connection.reset (); 824 establish_connection.stop ();
784} 825}
785 826
786void 827void
787connection::shutdown () 828connection::shutdown ()
788{ 829{
… …
793} 834}
794 835
795void 836void
796connection::rekey_cb (time_watcher &w) 837connection::rekey_cb (time_watcher &w)
797{ 838{
798 w.at = TSTAMP_CANCEL;
799
800 reset_connection (); 839 reset_connection ();
801 establish_connection (); 840 establish_connection ();
802} 841}
803 842
804void 843void
805connection::send_data_packet (tap_packet *pkt, bool broadcast) 844connection::send_data_packet (tap_packet *pkt)
806{ 845{
807 vpndata_packet *p = new vpndata_packet; 846 vpndata_packet *p = new vpndata_packet;
808 int tos = 0; 847 int tos = 0;
809 848
810 // I am not hilarious about peeking into packets, but so be it. 849 // I am not hilarious about peeking into packets, but so be it.
811 if (conf->inherit_tos 850 if (conf->inherit_tos && pkt->is_ipv4 ())
812 && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
813 && ((*pkt)[14] & 0xf0) == 0x40) // IPv4
814 tos = (*pkt)[15] & IPTOS_TOS_MASK; 851 tos = (*pkt)[15] & IPTOS_TOS_MASK;
815 852
816 p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs 853 p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
817 send_vpn_packet (p, si, tos); 854 send_vpn_packet (p, si, tos);
818 855
819 delete p; 856 delete p;
820 857
821 if (oseqno > MAX_SEQNO) 858 if (oseqno > MAX_SEQNO)
822 rekey (); 859 rekey ();
823} 860}
824 861
825void 862void
826connection::inject_data_packet (tap_packet *pkt, bool broadcast) 863connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)
827{ 864{
828 if (ictx && octx) 865 if (ictx && octx)
829 send_data_packet (pkt, broadcast); 866 send_data_packet (pkt);
830 else 867 else
831 { 868 {
832 if (!broadcast)//DDDD 869 if (!broadcast)//DDDD
833 data_queue.put (new tap_packet (*pkt)); 870 data_queue.put (new tap_packet (*pkt));
834 871
… …
840{ 877{
841 if (ictx && octx) 878 if (ictx && octx)
842 send_vpn_packet (pkt, si, tos); 879 send_vpn_packet (pkt, si, tos);
843 else 880 else
844 { 881 {
845 vpn_queue.put (new vpn_packet (*pkt)); 882 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
846 883
847 establish_connection (); 884 establish_connection ();
848 } 885 }
849} 886}
850 887
… …
909 if (p->initiate) 946 if (p->initiate)
910 send_auth_request (rsi, false); 947 send_auth_request (rsi, false);
911 948
912 rsachallenge k; 949 rsachallenge k;
913 950
914 if (0 > RSA_private_decrypt (sizeof (p->encr), 951 if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
915 (unsigned char *)&p->encr, (unsigned char *)&k, 952 {
916 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
917 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), 953 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
918 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); 954 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
955 break;
956 }
919 else 957 else
920 { 958 {
921 delete octx; 959 delete octx;
922 960
923 octx = new crypto_ctx (k, 1); 961 octx = new crypto_ctx (k, 1);
924 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 962 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
925 963
964 // compatibility code, remove when no longer required
965 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
966
926 conf->protocols = p->protocols; 967 conf->protocols = p->protocols;
968 features = p->features & config_packet::get_features ();
927 969
928 send_auth_response (rsi, p->id, k); 970 send_auth_response (rsi, p->id, k);
929 971
930 connection_established (); 972 connection_established ();
931 973
… …
967 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1009 crypto_ctx *cctx = new crypto_ctx (chg, 0);
968 1010
969 if (!p->hmac_chk (cctx)) 1011 if (!p->hmac_chk (cctx))
970 { 1012 {
971 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 1013 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
972 "could be an attack, or just corruption or an synchronization error"), 1014 "could be an attack, or just corruption or a synchronization error"),
973 conf->nodename, (const char *)rsi); 1015 conf->nodename, (const char *)rsi);
974 break; 1016 break;
975 } 1017 }
976 else 1018 else
977 { 1019 {
… …
1026 { 1068 {
1027 vpndata_packet *p = (vpndata_packet *)pkt; 1069 vpndata_packet *p = (vpndata_packet *)pkt;
1028 1070
1029 if (!p->hmac_chk (ictx)) 1071 if (!p->hmac_chk (ictx))
1030 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1072 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1031 "could be an attack, or just corruption or an synchronization error"), 1073 "could be an attack, or just corruption or a synchronization error"),
1032 conf->nodename, (const char *)rsi); 1074 conf->nodename, (const char *)rsi);
1033 else 1075 else
1034 { 1076 {
1035 u32 seqno; 1077 u32 seqno;
1036 tap_packet *d = p->unpack (this, seqno); 1078 tap_packet *d = p->unpack (this, seqno);
1037 1079
1038 if (iseqno.recv_ok (seqno)) 1080 if (iseqno.recv_ok (seqno))
1039 { 1081 {
1040 vpn->tap->send (d); 1082 vpn->tap->send (d);
1041 1083
1042 if (p->dst () == 0) // re-broadcast
1043 for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1044 {
1045 connection *c = *i;
1046
1047 if (c->conf != THISNODE && c->conf != conf)
1048 c->inject_data_packet (d);
1049 }
1050
1051 if (si != rsi) 1084 if (si != rsi)
1052 { 1085 {
1053 // fast re-sync on connection changes, useful especially for tcp/ip 1086 // fast re-sync on connection changes, useful especially for tcp/ip
1054 si = rsi; 1087 si = rsi;
1055 1088
1056 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1089 slog (L_INFO, _("%s(%s): socket address changed to %s"),
1057 conf->nodename, (const char *)si, (const char *)rsi); 1090 conf->nodename, (const char *)si, (const char *)rsi);
1058 } 1091 }
1059
1060 delete d;
1061
1062 break;
1063 } 1092 }
1093
1094 delete d;
1095 break;
1064 } 1096 }
1065 } 1097 }
1066 1098
1067 send_reset (rsi); 1099 send_reset (rsi);
1068 break; 1100 break;
… …
1093 break; 1125 break;
1094 1126
1095 case vpn_packet::PT_CONNECT_INFO: 1127 case vpn_packet::PT_CONNECT_INFO:
1096 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1128 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1097 { 1129 {
1098 connect_info_packet *p = (connect_info_packet *) pkt; 1130 connect_info_packet *p = (connect_info_packet *)pkt;
1099 1131
1100 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1132 if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything
1101 1133 {
1102 connection *c = vpn->conns[p->id - 1]; 1134 connection *c = vpn->conns[p->id - 1];
1103 1135
1104 c->conf->protocols = p->protocols; 1136 c->conf->protocols = p->protocols;
1105 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1137 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1106 p->si.upgrade_protocol (protocol, c->conf); 1138 p->si.upgrade_protocol (protocol, c->conf);
1107 1139
1108 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1140 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1109 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1141 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1110 1142
1111 const sockinfo &dsi = forward_si (p->si); 1143 const sockinfo &dsi = forward_si (p->si);
1112 1144
1113 if (dsi.valid ()) 1145 if (dsi.valid ())
1114 c->send_auth_request (dsi, true); 1146 c->send_auth_request (dsi, true);
1147 }
1115 } 1148 }
1116 1149
1117 break; 1150 break;
1118 1151
1119 default: 1152 default:
… …
1128 { 1161 {
1129 reset_connection (); 1162 reset_connection ();
1130 establish_connection (); 1163 establish_connection ();
1131 } 1164 }
1132 else if (NOW < last_activity + ::conf.keepalive) 1165 else if (NOW < last_activity + ::conf.keepalive)
1133 w.at = last_activity + ::conf.keepalive; 1166 w.start (last_activity + ::conf.keepalive);
1134 else if (conf->connectmode != conf_node::C_ONDEMAND 1167 else if (conf->connectmode != conf_node::C_ONDEMAND
1135 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1168 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1136 { 1169 {
1137 send_ping (si); 1170 send_ping (si);
1138 w.at = NOW + 5; 1171 w.start (NOW + 5);
1139 } 1172 }
1140 else if (NOW < last_activity + ::conf.keepalive + 10) 1173 else if (NOW < last_activity + ::conf.keepalive + 10)
1141 // hold ondemand connections implicitly a few seconds longer 1174 // hold ondemand connections implicitly a few seconds longer
1142 // should delete octx, though, or something like that ;) 1175 // should delete octx, though, or something like that ;)
1143 w.at = last_activity + ::conf.keepalive + 10; 1176 w.start (last_activity + ::conf.keepalive + 10);
1144 else 1177 else
1145 reset_connection (); 1178 reset_connection ();
1146} 1179}
1147 1180
1148void connection::send_connect_request (int id) 1181void connection::send_connect_request (int id)
… …
1183 putenv ("STATE=down"); 1216 putenv ("STATE=down");
1184 1217
1185 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1218 return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1186} 1219}
1187 1220
1188connection::connection(struct vpn *vpn_) 1221connection::connection (struct vpn *vpn, conf_node *conf)
1189: vpn(vpn_) 1222: vpn(vpn), conf(conf)
1190, rekey (this, &connection::rekey_cb) 1223, rekey (this, &connection::rekey_cb)
1191, keepalive (this, &connection::keepalive_cb) 1224, keepalive (this, &connection::keepalive_cb)
1192, establish_connection (this, &connection::establish_connection_cb) 1225, establish_connection (this, &connection::establish_connection_cb)
1226#if ENABLE_DNS
1227, dnsv4_tw (this, &connection::dnsv4_cb)
1228, dns_rcvdq (0), dns_snddq (0)
1229, dns_rcvseq (0), dns_sndseq (0)
1230#endif
1193{ 1231{
1194 octx = ictx = 0; 1232 octx = ictx = 0;
1195 retry_cnt = 0; 1233 retry_cnt = 0;
1196 1234
1235 if (!conf->protocols) // make sure some protocol is enabled
1236 conf->protocols = PROT_UDPv4;
1237
1197 connectmode = conf_node::C_ALWAYS; // initial setting 1238 connectmode = conf_node::C_ALWAYS; // initial setting
1198 reset_connection (); 1239 reset_connection ();
1199} 1240}
1200 1241
1201connection::~connection () 1242connection::~connection ()

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