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Comparing gvpe/src/connection.C (file contents):
Revision 1.70 by pcg, Thu Aug 7 19:07:02 2008 UTC vs.
Revision 1.99 by root, Wed Jul 17 04:36:03 2013 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> 3 Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4 4
5 This file is part of GVPE. 5 This file is part of GVPE.
6 6
7 GVPE is free software; you can redistribute it and/or modify it 7 GVPE is free software; you can redistribute it and/or modify it
8 under the terms of the GNU General Public License as published by the 8 under the terms of the GNU General Public License as published by the
… …
43#include "conf.h" 43#include "conf.h"
44#include "slog.h" 44#include "slog.h"
45#include "device.h" 45#include "device.h"
46#include "vpn.h" 46#include "vpn.h"
47#include "connection.h" 47#include "connection.h"
48#include "hkdf.h"
48 49
49#include "netcompat.h" 50#include "netcompat.h"
50 51
51#if !HAVE_RAND_PSEUDO_BYTES
52# define RAND_pseudo_bytes RAND_bytes
53#endif
54
55#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 52#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
56 53
57#define ULTRA_FAST 1 54#define ULTRA_FAST 1
58#define HLOG 15 55#define HLOG 15
59#include "lzf/lzf.h" 56#include "lzf/lzf.h"
60#include "lzf/lzf_c.c" 57#include "lzf/lzf_c.c"
… …
63////////////////////////////////////////////////////////////////////////////// 60//////////////////////////////////////////////////////////////////////////////
64 61
65static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; 62static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
66static ev::child rs_child_ev; 63static ev::child rs_child_ev;
67 64
65namespace
66{
68void // c++ requires external linkage here, apparently :( 67 void // c++ requires external linkage here, apparently :(
69rs_child_cb (ev::child &w, int revents) 68 rs_child_cb (ev::child &w, int revents)
70{ 69 {
71 w.stop (); 70 w.stop ();
72 71
73 if (rs_queue.empty ()) 72 if (rs_queue.empty ())
74 return; 73 return;
75 74
76 pid_t pid = run_script (*rs_queue.front ().first, false); 75 pid_t pid = run_script (*rs_queue.front ().first, false);
77 if (pid) 76 if (pid)
78 { 77 {
79 w.set (pid); 78 w.set (pid);
80 w.start (); 79 w.start ();
81 } 80 }
82 else 81 else
83 slog (L_WARN, rs_queue.front ().second); 82 slog (L_WARN, rs_queue.front ().second);
84 83
85 delete rs_queue.front ().first; 84 delete rs_queue.front ().first;
86 rs_queue.pop (); 85 rs_queue.pop ();
87} 86 }
87};
88 88
89// despite the fancy name, this is quite a hack 89// despite the fancy name, this is quite a hack
90static void 90static void
91run_script_queued (run_script_cb *cb, const char *warnmsg) 91run_script_queued (run_script_cb *cb, const char *warnmsg)
92{ 92{
… …
104struct crypto_ctx 104struct crypto_ctx
105{ 105{
106 EVP_CIPHER_CTX cctx; 106 EVP_CIPHER_CTX cctx;
107 HMAC_CTX hctx; 107 HMAC_CTX hctx;
108 108
109 crypto_ctx (const rsachallenge &challenge, int enc); 109 crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
110 ~crypto_ctx (); 110 ~crypto_ctx ();
111}; 111};
112 112
113crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) 113crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
114{ 114{
115 ecdh_key s;
116
117 curve25519_combine (a, b, s);
118
119 {
120 u8 mac_key[MAC_KEYSIZE];
121 static const unsigned char mac_info[] = "gvpe mac key";
122
123 hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
124 kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
125 kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
126 kdf.extract (s, sizeof (s));
127 kdf.extract_done (HKDF_PRF_HASH ());
128 kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
129
130 HMAC_CTX_init (&hctx);
131 require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
132 }
133
134 {
135 u8 cipher_key[CIPHER_KEYSIZE];
136 static const unsigned char cipher_info[] = "gvpe cipher key";
137
138 hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
139 kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
140 kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
141 kdf.extract (s, sizeof (s));
142 kdf.extract_done (HKDF_PRF_HASH ());
143 kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
144
115 EVP_CIPHER_CTX_init (&cctx); 145 EVP_CIPHER_CTX_init (&cctx);
116 require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); 146 require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
117 HMAC_CTX_init (&hctx); 147 }
118 HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
119} 148}
120 149
121crypto_ctx::~crypto_ctx () 150crypto_ctx::~crypto_ctx ()
122{ 151{
123 require (EVP_CIPHER_CTX_cleanup (&cctx)); 152 require (EVP_CIPHER_CTX_cleanup (&cctx));
124 HMAC_CTX_cleanup (&hctx); 153 HMAC_CTX_cleanup (&hctx);
125} 154}
126 155
156static inline void
157auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
158{
159 if (RSA_public_encrypt (sizeof (auth.rsa),
160 (unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
161 key, RSA_PKCS1_OAEP_PADDING) < 0)
162 fatal ("RSA_public_encrypt error");
163}
164
165static inline bool
166auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
167{
168 u8 rsa_decrypt[RSA_KEYLEN];
169
170 if (RSA_private_decrypt (sizeof (encr.rsa),
171 (const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
172 key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
173 return 0;
174
175 memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
176
177 return 1;
178}
179
127static void 180static void
128rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) 181auth_hash (const auth_data &auth, auth_mac &mac)
129{ 182{
130 EVP_MD_CTX ctx; 183 HMAC_CTX ctx;
131 184
132 EVP_MD_CTX_init (&ctx); 185 HMAC_CTX_init (&ctx);
133 require (EVP_DigestInit (&ctx, RSA_HASH)); 186 require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
134 require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); 187 require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
135 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
136 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); 188 require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
137 EVP_MD_CTX_cleanup (&ctx); 189 HMAC_CTX_cleanup (&ctx);
138} 190}
139 191
140struct rsa_entry 192void
193connection::generate_auth_data ()
141{ 194{
142 tstamp expire; 195 if (auth_expire < ev_now ())
143 rsaid id;
144 rsachallenge chg;
145};
146
147struct rsa_cache : list<rsa_entry>
148{
149 inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
150
151 bool find (const rsaid &id, rsachallenge &chg)
152 {
153 for (iterator i = begin (); i != end (); ++i)
154 { 196 {
155 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) 197 // request data
156 { 198 RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
157 memcpy (&chg, &i->chg, sizeof chg); 199 curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
200 auth_hash (snd_auth, snd_auth_mac);
158 201
159 erase (i); 202 // eventual response data
160 return true; 203 curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
161 }
162 } 204 }
163 205
164 if (!cleaner.is_active ()) 206 // every use prolongs the expiry
165 cleaner.again ();
166
167 return false;
168 }
169
170 void gen (rsaid &id, rsachallenge &chg)
171 {
172 rsa_entry e;
173
174 RAND_bytes ((unsigned char *)&id, sizeof id);
175 RAND_bytes ((unsigned char *)&chg, sizeof chg);
176
177 e.expire = ev_now () + RSA_TTL; 207 auth_expire = ev_now () + AUTH_TTL;
178 e.id = id;
179 memcpy (&e.chg, &chg, sizeof chg);
180
181 push_back (e);
182
183 if (!cleaner.is_active ())
184 cleaner.again ();
185 }
186
187 rsa_cache ()
188 {
189 cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
190 cleaner.set (RSA_TTL, RSA_TTL);
191 }
192
193} rsa_cache;
194
195void rsa_cache::cleaner_cb (ev::timer &w, int revents)
196{
197 if (empty ())
198 w.stop ();
199 else
200 {
201 for (iterator i = begin (); i != end (); )
202 if (i->expire <= ev_now ())
203 i = erase (i);
204 else
205 ++i;
206 }
207} 208}
208 209
209////////////////////////////////////////////////////////////////////////////// 210//////////////////////////////////////////////////////////////////////////////
210 211
211pkt_queue::pkt_queue (double max_ttl, int max_queue) 212pkt_queue::pkt_queue (double max_ttl, int max_queue)
… …
225 delete p; 226 delete p;
226 227
227 delete [] queue; 228 delete [] queue;
228} 229}
229 230
231void
230void pkt_queue::expire_cb (ev::timer &w, int revents) 232pkt_queue::expire_cb (ev::timer &w, int revents)
231{ 233{
232 ev_tstamp expire = ev_now () - max_ttl; 234 ev_tstamp expire = ev_now () - max_ttl;
233 235
234 for (;;) 236 for (;;)
235 { 237 {
… …
246 248
247 delete get (); 249 delete get ();
248 } 250 }
249} 251}
250 252
253void
251void pkt_queue::put (net_packet *p) 254pkt_queue::put (net_packet *p)
252{ 255{
253 ev_tstamp now = ev_now (); 256 ev_tstamp now = ev_now ();
254 257
255 // start expiry timer 258 // start expiry timer
256 if (empty ()) 259 if (empty ())
… …
265 queue[i].tstamp = now; 268 queue[i].tstamp = now;
266 269
267 i = ni; 270 i = ni;
268} 271}
269 272
270net_packet *pkt_queue::get () 273net_packet *
274pkt_queue::get ()
271{ 275{
272 if (empty ()) 276 if (empty ())
273 return 0; 277 return 0;
274 278
275 net_packet *p = queue[j].pkt; 279 net_packet *p = queue[j].pkt;
… …
299 303
300 bool can (const sockinfo &si) { return can((u32)si.host); } 304 bool can (const sockinfo &si) { return can((u32)si.host); }
301 bool can (u32 host); 305 bool can (u32 host);
302}; 306};
303 307
304net_rate_limiter auth_rate_limiter, reset_rate_limiter; 308static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
305 309
310bool
306bool net_rate_limiter::can (u32 host) 311net_rate_limiter::can (u32 host)
307{ 312{
308 iterator i; 313 iterator i;
309 314
310 for (i = begin (); i != end (); ) 315 for (i = begin (); i != end (); )
311 if (i->host == host) 316 if (i->host == host)
… …
358 363
359///////////////////////////////////////////////////////////////////////////// 364/////////////////////////////////////////////////////////////////////////////
360 365
361unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; 366unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
362 367
368void
363void hmac_packet::hmac_gen (crypto_ctx *ctx) 369hmac_packet::hmac_gen (crypto_ctx *ctx)
364{ 370{
365 unsigned int xlen; 371 unsigned int xlen;
366 372
367 HMAC_CTX *hctx = &ctx->hctx; 373 HMAC_CTX *hctx = &ctx->hctx;
368 374
369 HMAC_Init_ex (hctx, 0, 0, 0, 0); 375 require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
370 HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), 376 require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
371 len - sizeof (hmac_packet)); 377 len - sizeof (hmac_packet)));
372 HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); 378 require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
373} 379}
374 380
375void 381void
376hmac_packet::hmac_set (crypto_ctx *ctx) 382hmac_packet::hmac_set (crypto_ctx *ctx)
377{ 383{
… …
386 hmac_gen (ctx); 392 hmac_gen (ctx);
387 393
388 return !memcmp (hmac, hmac_digest, HMACLENGTH); 394 return !memcmp (hmac, hmac_digest, HMACLENGTH);
389} 395}
390 396
397void
391void vpn_packet::set_hdr (ptype type_, unsigned int dst) 398vpn_packet::set_hdr (ptype type_, unsigned int dst)
392{ 399{
393 type = type_; 400 type = type_;
394 401
395 int src = THISNODE->id; 402 int src = THISNODE->id;
396 403
… …
401 408
402#define MAXVPNDATA (MAX_MTU - 6 - 6) 409#define MAXVPNDATA (MAX_MTU - 6 - 6)
403#define DATAHDR (sizeof (u32) + RAND_SIZE) 410#define DATAHDR (sizeof (u32) + RAND_SIZE)
404 411
405struct vpndata_packet : vpn_packet 412struct vpndata_packet : vpn_packet
413{
414 u8 data[MAXVPNDATA + DATAHDR]; // seqno
415
416 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
417 tap_packet *unpack (connection *conn, u32 &seqno);
418
419private:
420 const u32 data_hdr_size () const
406 { 421 {
407 u8 data[MAXVPNDATA + DATAHDR]; // seqno
408
409 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
410 tap_packet *unpack (connection *conn, u32 &seqno);
411private:
412
413 const u32 data_hdr_size () const
414 {
415 return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; 422 return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
416 }
417 }; 423 }
424};
418 425
419void 426void
420vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) 427vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
421{ 428{
422 EVP_CIPHER_CTX *cctx = &conn->octx->cctx; 429 EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
… …
424 ptype type = PT_DATA_UNCOMPRESSED; 431 ptype type = PT_DATA_UNCOMPRESSED;
425 432
426#if ENABLE_COMPRESSION 433#if ENABLE_COMPRESSION
427 u8 cdata[MAX_MTU]; 434 u8 cdata[MAX_MTU];
428 435
429 if (conn->features & ENABLE_COMPRESSION) 436 if (conn->features & FEATURE_COMPRESSION)
430 { 437 {
431 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 438 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
432 439
433 if (cl) 440 if (cl)
434 { 441 {
… …
440 d[1] = cl; 447 d[1] = cl;
441 } 448 }
442 } 449 }
443#endif 450#endif
444 451
445 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); 452 require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
446 453
447 struct { 454 struct {
448#if RAND_SIZE 455#if RAND_SIZE
449 u8 rnd[RAND_SIZE]; 456 u8 rnd[RAND_SIZE];
450#endif 457#endif
451 u32 seqno; 458 u32 seqno;
452 } datahdr; 459 } datahdr;
453 460
454 datahdr.seqno = ntohl (seqno); 461 datahdr.seqno = ntohl (seqno);
455#if RAND_SIZE 462#if RAND_SIZE
456 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); 463 RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
457#endif 464#endif
458 465
459 require (EVP_EncryptUpdate (cctx, 466 require (EVP_EncryptUpdate (cctx,
460 (unsigned char *) data + outl, &outl2, 467 (unsigned char *) data + outl, &outl2,
461 (unsigned char *) &datahdr, DATAHDR)); 468 (unsigned char *) &datahdr, DATAHDR));
… …
483 int outl = 0, outl2; 490 int outl = 0, outl2;
484 tap_packet *p = new tap_packet; 491 tap_packet *p = new tap_packet;
485 u8 *d; 492 u8 *d;
486 u32 l = len - data_hdr_size (); 493 u32 l = len - data_hdr_size ();
487 494
488 require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); 495 require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
489 496
490#if ENABLE_COMPRESSION 497#if ENABLE_COMPRESSION
491 u8 cdata[MAX_MTU]; 498 u8 cdata[MAX_MTU];
492 499
493 if (type == PT_DATA_COMPRESSED) 500 if (type == PT_DATA_COMPRESSED)
… …
535 } 542 }
536}; 543};
537 544
538struct config_packet : vpn_packet 545struct config_packet : vpn_packet
539{ 546{
540 // actually, hmaclen cannot be checked because the hmac
541 // field comes before this data, so peers with other
542 // hmacs simply will not work.
543 u8 prot_major, prot_minor, randsize, hmaclen; 547 u8 prot_major, prot_minor, randsize;
544 u8 flags, challengelen, features, pad3; 548 u8 flags, features, pad6, pad7, pad8;
545 u32 cipher_nid, digest_nid, hmac_nid; 549 u32 cipher_nid, mac_nid, auth_nid;
546 550
547 void setup (ptype type, int dst); 551 void setup (ptype type, int dst);
548 bool chk_config () const; 552 bool chk_config () const;
549 553
550 static u8 get_features () 554 static u8 get_features ()
… …
561#endif 565#endif
562 return f; 566 return f;
563 } 567 }
564}; 568};
565 569
570void
566void config_packet::setup (ptype type, int dst) 571config_packet::setup (ptype type, int dst)
567{ 572{
568 prot_major = PROTOCOL_MAJOR; 573 prot_major = PROTOCOL_MAJOR;
569 prot_minor = PROTOCOL_MINOR; 574 prot_minor = PROTOCOL_MINOR;
570 randsize = RAND_SIZE; 575 randsize = RAND_SIZE;
571 hmaclen = HMACLENGTH;
572 flags = 0; 576 flags = 0;
573 challengelen = sizeof (rsachallenge);
574 features = get_features (); 577 features = get_features ();
575 578
576 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 579 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
577 digest_nid = htonl (EVP_MD_type (RSA_HASH));
578 hmac_nid = htonl (EVP_MD_type (DIGEST)); 580 mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
581 auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
579 582
580 len = sizeof (*this) - sizeof (net_packet); 583 len = sizeof (*this) - sizeof (net_packet);
581 set_hdr (type, dst); 584 set_hdr (type, dst);
582} 585}
583 586
587bool
584bool config_packet::chk_config () const 588config_packet::chk_config () const
585{ 589{
586 if (prot_major != PROTOCOL_MAJOR) 590 if (prot_major != PROTOCOL_MAJOR)
587 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 591 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
588 else if (randsize != RAND_SIZE) 592 else if (randsize != RAND_SIZE)
589 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 593 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
590 else if (hmaclen != HMACLENGTH)
591 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
592 else if (challengelen != sizeof (rsachallenge))
593 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
594 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 594 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
595 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 595 slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
596 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
597 slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
598 else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) 596 else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
599 slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); 597 slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
598 else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
599 slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
600 else 600 else
601 return true; 601 return true;
602 602
603 return false; 603 return false;
604} 604}
605 605
606struct auth_req_packet : config_packet 606struct auth_req_packet : config_packet // UNPROTECTED
607{ 607{
608 char magic[8]; 608 char magic[8];
609 u8 initiate; // false if this is just an automatic reply 609 u8 initiate; // false if this is just an automatic reply
610 u8 protocols; // supported protocols (will be patched on forward) 610 u8 protocols; // supported protocols (will be patched on forward)
611 u8 pad2, pad3; 611 u8 pad2, pad3;
612 rsaid id; 612 auth_encr encr;
613 rsaencrdata encr;
614 613
615 auth_req_packet (int dst, bool initiate_, u8 protocols_) 614 auth_req_packet (int dst, bool initiate_, u8 protocols_)
616 { 615 {
617 config_packet::setup (PT_AUTH_REQ, dst); 616 config_packet::setup (PT_AUTH_REQ, dst);
618 strncpy (magic, MAGIC, 8); 617 memcpy (magic, MAGIC, 8);
619 initiate = !!initiate_; 618 initiate = !!initiate_;
620 protocols = protocols_; 619 protocols = protocols_;
621 620
622 len = sizeof (*this) - sizeof (net_packet); 621 len = sizeof (*this) - sizeof (net_packet);
623 } 622 }
624}; 623};
625 624
626struct auth_res_packet : config_packet 625struct auth_res_packet : config_packet // UNPROTECTED
627{ 626{
628 rsaid id;
629 u8 pad1, pad2, pad3;
630 u8 response_len; // encrypted length
631 rsaresponse response; 627 auth_response response;
632 628
633 auth_res_packet (int dst) 629 auth_res_packet (int dst)
634 { 630 {
635 config_packet::setup (PT_AUTH_RES, dst); 631 config_packet::setup (PT_AUTH_RES, dst);
636 632
… …
670}; 666};
671 667
672///////////////////////////////////////////////////////////////////////////// 668/////////////////////////////////////////////////////////////////////////////
673 669
674void 670void
675connection::connection_established () 671connection::connection_established (const sockinfo &rsi)
676{ 672{
677 slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); 673 if (!have_snd_auth || !have_rcv_auth)
674 return;
675
676 si = rsi;
677 protocol = rsi.prot;
678
679 slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
680 conf->nodename, (const char *)rsi,
681 is_direct ? "direct" : "forwarded",
682 PROTOCOL_MAJOR, prot_minor);
683
684 if (::conf.script_node_up)
685 {
686 run_script_cb *cb = new run_script_cb;
687 cb->set<connection, &connection::script_node_up> (this);
688 run_script_queued (cb, _("node-up command execution failed, continuing."));
689 }
690
691 delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
692 iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
693
694 delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
695 oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
678 696
679 if (ictx && octx) 697 if (ictx && octx)
680 { 698 {
681 // make sure rekeying timeouts are slightly asymmetric 699 // make sure rekeying timeouts are slightly asymmetric
682 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); 700 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
683 rekey.start (rekey_interval, rekey_interval); 701 rekey.start (rekey_interval, rekey_interval);
702
684 keepalive.start (::conf.keepalive); 703 keepalive.start (::conf.keepalive);
685 704
686 // send queued packets 705 // send queued packets
687 if (ictx && octx) 706 if (ictx && octx)
688 { 707 {
… …
696 { 715 {
697 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); 716 if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
698 delete p; 717 delete p;
699 } 718 }
700 } 719 }
720
721 vpn->connection_established (this);
701 } 722 }
723#if 0
702 else 724 else
703 { 725 {
704 retry_cnt = 0; 726 retry_cnt = 0;
705 establish_connection.start (5); 727 establish_connection.start (5);
706 keepalive.stop (); 728 keepalive.stop ();
707 rekey.stop (); 729 rekey.stop ();
708 } 730 }
731#endif
709} 732}
710 733
711void 734void
712connection::reset_si () 735connection::reset_si ()
713{ 736{
737 if (vpn->can_direct (THISNODE, conf))
714 protocol = best_protocol (THISNODE->protocols & conf->protocols); 738 protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
715 739 else
716 // mask out protocols we cannot establish
717 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
718 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
719 if (!conf->dns_port) protocol &= ~PROT_DNSv4;
720
721 if (protocol
722 && (!conf->can_direct (THISNODE)
723 || !THISNODE->can_direct (conf)))
724 { 740 {
725 slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); 741 slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
726 protocol = 0; 742 protocol = 0;
727 } 743 }
728 744
729 si.set (conf, protocol); 745 si.set (conf, protocol);
746
747 is_direct = si.valid ();
730} 748}
731 749
732// ensure sockinfo is valid, forward if necessary 750// ensure sockinfo is valid, forward if necessary
733const sockinfo & 751const sockinfo &
734connection::forward_si (const sockinfo &si) const 752connection::forward_si (const sockinfo &si) const
735{ 753{
736 if (!si.valid ()) 754 if (!si.valid ())
737 { 755 {
738 connection *r = vpn->find_router (); 756 connection *r = vpn->find_router_for (this);
739 757
740 if (r) 758 if (r)
741 { 759 {
742 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), 760 slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
743 conf->nodename, r->conf->nodename, (const char *)r->si); 761 conf->nodename, r->conf->nodename);
744 return r->si; 762 return r->si;
745 } 763 }
746 else 764 else
747 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 765 slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
748 conf->nodename); 766 conf->nodename);
749 } 767 }
750 768
751 return si; 769 return si;
752} 770}
… …
762connection::send_ping (const sockinfo &si, u8 pong) 780connection::send_ping (const sockinfo &si, u8 pong)
763{ 781{
764 ping_packet *pkt = new ping_packet; 782 ping_packet *pkt = new ping_packet;
765 783
766 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); 784 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
785
786 slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
767 send_vpn_packet (pkt, si, IPTOS_LOWDELAY); 787 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
768 788
769 delete pkt; 789 delete pkt;
770} 790}
771 791
… …
786void 806void
787connection::send_auth_request (const sockinfo &si, bool initiate) 807connection::send_auth_request (const sockinfo &si, bool initiate)
788{ 808{
789 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); 809 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
790 810
791 rsachallenge chg; 811 generate_auth_data ();
792 rsa_cache.gen (pkt->id, chg);
793 rsa_encrypt (conf->rsa_key, chg, pkt->encr); 812 auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
794 813
795 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 814 slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
796
797 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly 815 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
798 816
799 delete pkt; 817 delete pkt;
800} 818}
801 819
802void 820void
803connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) 821connection::send_auth_response (const sockinfo &si)
804{ 822{
805 auth_res_packet *pkt = new auth_res_packet (conf->id); 823 auth_res_packet *pkt = new auth_res_packet (conf->id);
806 824
807 pkt->id = id; 825 auth_hash (rcv_auth, pkt->response.mac);
826 memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
808 827
809 rsa_hash (id, chg, pkt->response);
810
811 pkt->hmac_set (octx);
812
813 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); 828 slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
814
815 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 829 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
816 830
817 delete pkt; 831 delete pkt;
818} 832}
819 833
820void 834void
821connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 835connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
822{ 836{
823 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", 837 slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
824 conf->id, rid, (const char *)rsi); 838 vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
839 conf->protocols);
825 840
826 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 841 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
827 842
828 r->hmac_set (octx); 843 r->hmac_set (octx);
829 send_vpn_packet (r, si); 844 send_vpn_packet (r, si);
… …
832} 847}
833 848
834inline void 849inline void
835connection::establish_connection_cb (ev::timer &w, int revents) 850connection::establish_connection_cb (ev::timer &w, int revents)
836{ 851{
837 if (!ictx 852 if (!(ictx && octx)
838 && conf != THISNODE 853 && conf != THISNODE
839 && connectmode != conf_node::C_NEVER 854 && connectmode != conf_node::C_NEVER
840 && connectmode != conf_node::C_DISABLED 855 && connectmode != conf_node::C_DISABLED
841 && !w.is_active ()) 856 && !w.is_active ())
842 { 857 {
… …
856 871
857 reset_si (); 872 reset_si ();
858 873
859 bool slow = si.prot & PROT_SLOW; 874 bool slow = si.prot & PROT_SLOW;
860 875
861 if (si.prot && !si.host) 876 if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
862 { 877 {
863 slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
864 /*TODO*/ /* start the timer so we don't recurse endlessly */ 878 /*TODO*/ /* start the timer so we don't recurse endlessly */
865 w.start (1); 879 w.start (1);
866 vpn->send_connect_request (conf->id); 880 vpn->send_connect_request (this);
867 } 881 }
868 else 882 else
869 { 883 {
870 slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); 884 if (si.valid ())
885 slog (L_DEBUG, _("%s: sending direct connection request to %s."),
886 conf->nodename, (const char *)si);
871 887
872 const sockinfo &dsi = forward_si (si); 888 const sockinfo &dsi = forward_si (si);
873 889
874 slow = slow || (dsi.prot & PROT_SLOW); 890 slow = slow || (dsi.prot & PROT_SLOW);
875 891
… …
909 } 925 }
910 } 926 }
911 927
912 delete ictx; ictx = 0; 928 delete ictx; ictx = 0;
913 delete octx; octx = 0; 929 delete octx; octx = 0;
914#if ENABLE_DNS
915 dnsv4_reset_connection ();
916#endif
917 930
918 si.host = 0; 931 si.host = 0;
919 932
933 have_snd_auth = false;
934 have_rcv_auth = false;
935 auth_expire = 0.;
936
920 last_activity = 0; 937 last_activity = 0.;
938 //last_si_change = 0.;
921 retry_cnt = 0; 939 retry_cnt = 0;
922 940
923 rekey.stop (); 941 rekey.stop ();
924 keepalive.stop (); 942 keepalive.stop ();
925 establish_connection.stop (); 943 establish_connection.stop ();
… …
932 send_reset (si); 950 send_reset (si);
933 951
934 reset_connection (); 952 reset_connection ();
935} 953}
936 954
955// poor-man's rekeying
937inline void 956inline void
938connection::rekey_cb (ev::timer &w, int revents) 957connection::rekey_cb (ev::timer &w, int revents)
939{ 958{
940 reset_connection (); 959 reset_connection ();
941 establish_connection (); 960 establish_connection ();
… …
980 data_queue.put (new tap_packet (*pkt)); 999 data_queue.put (new tap_packet (*pkt));
981 post_inject_queue (); 1000 post_inject_queue ();
982 } 1001 }
983} 1002}
984 1003
1004void
985void connection::inject_vpn_packet (vpn_packet *pkt, int tos) 1005connection::inject_vpn_packet (vpn_packet *pkt, int tos)
986{ 1006{
987 if (ictx && octx) 1007 if (ictx && octx)
988 send_vpn_packet (pkt, si, tos); 1008 send_vpn_packet (pkt, si, tos);
989 else 1009 else
990 { 1010 {
… …
996void 1016void
997connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 1017connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
998{ 1018{
999 last_activity = ev_now (); 1019 last_activity = ev_now ();
1000 1020
1001 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 1021 slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
1002 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 1022 conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
1003 1023
1004 if (connectmode == conf_node::C_DISABLED) 1024 if (connectmode == conf_node::C_DISABLED)
1005 return; 1025 return;
1006 1026
1007 switch (pkt->typ ()) 1027 switch (pkt->typ ())
1008 { 1028 {
1009 case vpn_packet::PT_PING: 1029 case vpn_packet::PT_PING:
1030 slog (L_TRACE, "%s >> PT_PING", conf->nodename);
1031
1010 // we send pings instead of auth packets after some retries, 1032 // we send pings instead of auth packets after some retries,
1011 // so reset the retry counter and establish a connection 1033 // so reset the retry counter and establish a connection
1012 // when we receive a ping. 1034 // when we receive a ping.
1013 if (!ictx) 1035 if (!ictx)
1014 { 1036 {
1015 if (auth_rate_limiter.can (rsi)) 1037 if (auth_rate_limiter.can (rsi))
1016 send_auth_request (rsi, true); 1038 send_auth_request (rsi, true);
1017 } 1039 }
1018 else 1040 else
1041 // we would love to change the socket address here, but ping's aren't
1042 // authenticated, so we best ignore it.
1019 send_ping (rsi, 1); // pong 1043 send_ping (rsi, 1); // pong
1020 1044
1021 break; 1045 break;
1022 1046
1023 case vpn_packet::PT_PONG: 1047 case vpn_packet::PT_PONG:
1048 slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
1049
1050 // a PONG might mean that the other side doesn't really know
1051 // about our desire for communication.
1052 establish_connection ();
1024 break; 1053 break;
1025 1054
1026 case vpn_packet::PT_RESET: 1055 case vpn_packet::PT_RESET:
1027 { 1056 {
1028 reset_connection (); 1057 reset_connection ();
1029 1058
1030 config_packet *p = (config_packet *) pkt; 1059 config_packet *p = (config_packet *) pkt;
1031 1060
1032 if (!p->chk_config ()) 1061 if (!p->chk_config ())
1033 { 1062 {
1034 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), 1063 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
1035 conf->nodename, (const char *)rsi); 1064 conf->nodename, (const char *)rsi);
1036 connectmode = conf_node::C_DISABLED; 1065 connectmode = conf_node::C_DISABLED;
1037 } 1066 }
1038 else if (connectmode == conf_node::C_ALWAYS) 1067 else if (connectmode == conf_node::C_ALWAYS)
1039 establish_connection (); 1068 establish_connection ();
… …
1041 break; 1070 break;
1042 1071
1043 case vpn_packet::PT_AUTH_REQ: 1072 case vpn_packet::PT_AUTH_REQ:
1044 if (auth_rate_limiter.can (rsi)) 1073 if (auth_rate_limiter.can (rsi))
1045 { 1074 {
1046 auth_req_packet *p = (auth_req_packet *) pkt; 1075 auth_req_packet *p = (auth_req_packet *)pkt;
1047 1076
1048 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); 1077 slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
1078 conf->nodename, p->initiate ? "initiate" : "reply",
1079 p->protocols, p->features);
1049 1080
1050 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 1081 if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
1051 { 1082 {
1052 if (p->prot_minor != PROTOCOL_MINOR) 1083 if (p->prot_minor != PROTOCOL_MINOR)
1053 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 1084 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1054 conf->nodename, (const char *)rsi, 1085 conf->nodename, (const char *)rsi,
1055 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 1086 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1056 1087
1057 if (p->initiate) 1088 if (p->initiate)
1058 send_auth_request (rsi, false); 1089 send_auth_request (rsi, false);
1059 1090
1060 rsachallenge k; 1091 auth_data auth;
1061 1092
1062 if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) 1093 if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
1063 { 1094 {
1064 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), 1095 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
1065 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); 1096 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
1066 break;
1067 } 1097 }
1068 else 1098 else
1069 { 1099 {
1070 delete octx; 1100 bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
1071 1101
1072 octx = new crypto_ctx (k, 1); 1102 rcv_auth = auth;
1073 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 1103 have_rcv_auth = true;
1074 1104
1105 send_auth_response (rsi);
1106
1107 if (chg)
1108 {
1075 conf->protocols = p->protocols; 1109 conf->protocols = p->protocols;
1076 features = p->features & config_packet::get_features (); 1110 features = p->features & config_packet::get_features ();
1077 1111
1078 send_auth_response (rsi, p->id, k);
1079
1080 connection_established (); 1112 connection_established (rsi);
1081
1082 break; 1113 }
1083 } 1114 }
1115
1116 break;
1084 } 1117 }
1085 else 1118 else
1086 slog (L_WARN, _("%s(%s): protocol mismatch"), 1119 slog (L_WARN, _("%s(%s): protocol mismatch."),
1087 conf->nodename, (const char *)rsi); 1120 conf->nodename, (const char *)rsi);
1088 1121
1089 send_reset (rsi); 1122 send_reset (rsi);
1090 } 1123 }
1091 1124
1092 break; 1125 break;
1093 1126
1094 case vpn_packet::PT_AUTH_RES: 1127 case vpn_packet::PT_AUTH_RES:
1095 { 1128 {
1096 auth_res_packet *p = (auth_res_packet *) pkt; 1129 auth_res_packet *p = (auth_res_packet *)pkt;
1097 1130
1098 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1131 slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
1099 1132
1100 if (p->chk_config ()) 1133 if (p->chk_config ())
1101 { 1134 {
1102 if (p->prot_minor != PROTOCOL_MINOR) 1135 if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
1103 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1104 conf->nodename, (const char *)rsi,
1105 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1106
1107 rsachallenge chg;
1108
1109 if (!rsa_cache.find (p->id, chg))
1110 { 1136 {
1111 slog (L_ERR, _("%s(%s): unrequested auth response ignored"), 1137 slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1112 conf->nodename, (const char *)rsi); 1138 conf->nodename, (const char *)rsi);
1113 break;
1114 } 1139 }
1115 else 1140 else if (!have_snd_auth)
1116 { 1141 {
1117 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1142 if (p->prot_minor != PROTOCOL_MINOR)
1118 1143 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1119 if (!p->hmac_chk (cctx))
1120 {
1121 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1122 "could be an attack, or just corruption or a synchronization error"),
1123 conf->nodename, (const char *)rsi); 1144 conf->nodename, (const char *)rsi,
1124 break; 1145 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1125 }
1126 else
1127 {
1128 rsaresponse h;
1129 1146
1130 rsa_hash (p->id, chg, h);
1131
1132 if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1133 {
1134 prot_minor = p->prot_minor; 1147 prot_minor = p->prot_minor;
1148 memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
1135 1149
1136 delete ictx; ictx = cctx; 1150 have_snd_auth = true;
1137
1138 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1139
1140 si = rsi;
1141 protocol = rsi.prot;
1142
1143 connection_established (); 1151 connection_established (rsi);
1144
1145 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1146 conf->nodename, (const char *)rsi,
1147 p->prot_major, p->prot_minor);
1148
1149 if (::conf.script_node_up)
1150 {
1151 run_script_cb *cb = new run_script_cb;
1152 cb->set<connection, &connection::script_node_up> (this);
1153 run_script_queued (cb, _("node-up command execution failed, continuing."));
1154 }
1155
1156 break;
1157 }
1158 else
1159 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1160 conf->nodename, (const char *)rsi);
1161 }
1162
1163 delete cctx;
1164 } 1152 }
1153
1154 break;
1165 } 1155 }
1166 } 1156 }
1167 1157
1168 send_reset (rsi); 1158 send_reset (rsi);
1169 break; 1159 break;
… …
1180 { 1170 {
1181 vpndata_packet *p = (vpndata_packet *)pkt; 1171 vpndata_packet *p = (vpndata_packet *)pkt;
1182 1172
1183 if (!p->hmac_chk (ictx)) 1173 if (!p->hmac_chk (ictx))
1184 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" 1174 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1185 "could be an attack, or just corruption or a synchronization error"), 1175 "could be an attack, or just corruption or a synchronization error."),
1186 conf->nodename, (const char *)rsi); 1176 conf->nodename, (const char *)rsi);
1187 else 1177 else
1188 { 1178 {
1189 u32 seqno; 1179 u32 seqno;
1190 tap_packet *d = p->unpack (this, seqno); 1180 tap_packet *d = p->unpack (this, seqno);
1181 int seqclass = iseqno.seqno_classify (seqno);
1191 1182
1192 if (iseqno.recv_ok (seqno)) 1183 if (seqclass == 0) // ok
1193 { 1184 {
1194 vpn->tap->send (d); 1185 vpn->tap->send (d);
1195 1186
1196 if (si != rsi) 1187 if (si != rsi)
1197 { 1188 {
1198 // fast re-sync on source address changes, useful especially for tcp/ip 1189 // fast re-sync on source address changes, useful especially for tcp/ip
1190 //if (last_si_change < ev_now () + 5.)
1199 si = rsi; 1191 // {
1200
1201 slog (L_INFO, _("%s(%s): socket address changed to %s"), 1192 slog (L_INFO, _("%s(%s): changing socket address to %s."),
1202 conf->nodename, (const char *)si, (const char *)rsi); 1193 conf->nodename, (const char *)si, (const char *)rsi);
1194
1195 si = rsi;
1196
1197 if (::conf.script_node_change)
1198 {
1199 run_script_cb *cb = new run_script_cb;
1200 cb->set<connection, &connection::script_node_change> (this);
1201 run_script_queued (cb, _("node-change command execution failed, continuing."));
1202 }
1203
1204 // }
1205 //else
1206 // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
1207 // conf->nodename, (const char *)si, (const char *)rsi);
1203 } 1208 }
1209 }
1210 else if (seqclass == 1) // far history
1211 slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
1212 "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
1213 else if (seqclass == 2) // in-window duplicate, happens often on wireless
1214 slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
1215 "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
1216 else if (seqclass == 3) // reset
1217 {
1218 slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
1219 "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
1220 send_reset (rsi);
1204 } 1221 }
1205 1222
1206 delete d; 1223 delete d;
1207 break; 1224 break;
1208 } 1225 }
… …
1212 break; 1229 break;
1213 1230
1214 case vpn_packet::PT_CONNECT_REQ: 1231 case vpn_packet::PT_CONNECT_REQ:
1215 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1232 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1216 { 1233 {
1217 connect_req_packet *p = (connect_req_packet *) pkt; 1234 connect_req_packet *p = (connect_req_packet *)pkt;
1218 1235
1219 if (p->id > 0 && p->id <= vpn->conns.size ()) 1236 if (p->id > 0 && p->id <= vpn->conns.size ())
1220 { 1237 {
1221 connection *c = vpn->conns[p->id - 1]; 1238 connection *c = vpn->conns[p->id - 1];
1222 conf->protocols = p->protocols; 1239 conf->protocols = p->protocols;
1223 1240
1224 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", 1241 slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
1242 conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1243 p->protocols,
1225 conf->id, p->id, c->ictx && c->octx); 1244 c->ictx && c->octx);
1226 1245
1227 if (c->ictx && c->octx) 1246 if (c->ictx && c->octx)
1228 { 1247 {
1229 // send connect_info packets to both sides, in case one is 1248 // send connect_info packets to both sides, in case one is
1230 // behind a nat firewall (or both ;) 1249 // behind a nat firewall (or both ;)
… …
1253 1272
1254 c->conf->protocols = p->protocols; 1273 c->conf->protocols = p->protocols;
1255 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); 1274 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1256 p->si.upgrade_protocol (protocol, c->conf); 1275 p->si.upgrade_protocol (protocol, c->conf);
1257 1276
1258 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1277 slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1259 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1278 conf->nodename,
1279 vpn->conns[p->id - 1]->conf->nodename,
1280 (const char *)p->si,
1281 p->protocols,
1282 protocol,
1283 p->si.supported_protocols (c->conf),
1284 !c->ictx && !c->octx);
1260 1285
1261 const sockinfo &dsi = forward_si (p->si); 1286 const sockinfo &dsi = forward_si (p->si);
1262 1287
1263 if (dsi.valid ()) 1288 if (dsi.valid ())
1264 c->send_auth_request (dsi, true); 1289 c->send_auth_request (dsi, true);
1290 else
1291 slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
1292 vpn->conns[p->id - 1]->conf->nodename,
1293 (const char *)p->si);
1265 } 1294 }
1266 else 1295 else
1267 slog (L_WARN, 1296 slog (L_WARN,
1268 _("received authenticated connection request from unknown node #%d, config file mismatch?"), 1297 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1269 p->id); 1298 p->id);
… …
1278} 1307}
1279 1308
1280inline void 1309inline void
1281connection::keepalive_cb (ev::timer &w, int revents) 1310connection::keepalive_cb (ev::timer &w, int revents)
1282{ 1311{
1283 if (ev_now () >= last_activity + ::conf.keepalive + 30) 1312 ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
1313
1314 if (when >= 0)
1315 w.start (when);
1316 else if (when < -15)
1284 { 1317 {
1285 reset_connection (); 1318 reset_connection ();
1286 establish_connection (); 1319 establish_connection ();
1287 } 1320 }
1288 else if (ev_now () < last_activity + ::conf.keepalive)
1289 w.start (last_activity + ::conf.keepalive - ev::now ());
1290 else if (conf->connectmode != conf_node::C_ONDEMAND 1321 else if (conf->connectmode != conf_node::C_ONDEMAND
1291 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1322 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1292 { 1323 {
1324 w.start (3);
1293 send_ping (si); 1325 send_ping (si);
1294 w.start (5);
1295 } 1326 }
1296 else if (ev_now () < last_activity + ::conf.keepalive + 10) 1327 else if (when >= -10)
1297 // hold ondemand connections implicitly a few seconds longer 1328 // hold ondemand connections implicitly a few seconds longer
1298 // should delete octx, though, or something like that ;) 1329 // should delete octx, though, or something like that ;)
1299 w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); 1330 w.start (when + 10);
1300 else 1331 else
1301 reset_connection (); 1332 reset_connection ();
1302} 1333}
1303 1334
1335void
1304void connection::send_connect_request (int id) 1336connection::send_connect_request (int id)
1305{ 1337{
1306 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1338 connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1307 1339
1308 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1340 slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
1341 conf->nodename, vpn->conns[id - 1]->conf->nodename,
1342 THISNODE->protocols);
1309 p->hmac_set (octx); 1343 p->hmac_set (octx);
1310 send_vpn_packet (p, si); 1344 send_vpn_packet (p, si);
1311 1345
1312 delete p; 1346 delete p;
1313} 1347}
1314 1348
1349void
1315void connection::script_init_env (const char *ext) 1350connection::script_init_env (const char *ext)
1316{ 1351{
1317 char *env; 1352 char *env;
1318 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); 1353 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1319 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); 1354 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1320 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, 1355 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1321 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, 1356 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1322 conf->id & 0xff); putenv (env); 1357 conf->id & 0xff); putenv (env);
1323} 1358}
1324 1359
1360void
1325void connection::script_init_connect_env () 1361connection::script_init_connect_env ()
1326{ 1362{
1327 vpn->script_init_env (); 1363 vpn->script_init_env ();
1328 1364
1329 char *env; 1365 char *env;
1330 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1366 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1367 asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1331 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1368 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1332 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1369 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1333 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1370 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1334} 1371}
1335 1372
1336inline const char * 1373inline const char *
1337connection::script_node_up () 1374connection::script_node_up ()
1338{ 1375{
… …
1348 1385
1349 return filename; 1386 return filename;
1350} 1387}
1351 1388
1352inline const char * 1389inline const char *
1390connection::script_node_change ()
1391{
1392 script_init_connect_env ();
1393
1394 putenv ((char *)"STATE=change");
1395
1396 char *filename;
1397 asprintf (&filename,
1398 "%s/%s",
1399 confbase,
1400 ::conf.script_node_change ? ::conf.script_node_change : "node-change");
1401
1402 return filename;
1403}
1404
1405inline const char *
1353connection::script_node_down () 1406connection::script_node_down ()
1354{ 1407{
1355 script_init_connect_env (); 1408 script_init_connect_env ();
1356 1409
1357 putenv ((char *)"STATE=down"); 1410 putenv ((char *)"STATE=down");
… …
1368connection::connection (struct vpn *vpn, conf_node *conf) 1421connection::connection (struct vpn *vpn, conf_node *conf)
1369: vpn(vpn), conf(conf), 1422: vpn(vpn), conf(conf),
1370#if ENABLE_DNS 1423#if ENABLE_DNS
1371 dns (0), 1424 dns (0),
1372#endif 1425#endif
1373 data_queue(conf->max_ttl, conf->max_queue), 1426 data_queue(conf->max_ttl, conf->max_queue + 1),
1374 vpn_queue(conf->max_ttl, conf->max_queue) 1427 vpn_queue(conf->max_ttl, conf->max_queue + 1)
1375{ 1428{
1376 rekey .set<connection, &connection::rekey_cb > (this); 1429 rekey .set<connection, &connection::rekey_cb > (this);
1377 keepalive .set<connection, &connection::keepalive_cb > (this); 1430 keepalive .set<connection, &connection::keepalive_cb > (this);
1378 establish_connection.set<connection, &connection::establish_connection_cb> (this); 1431 establish_connection.set<connection, &connection::establish_connection_cb> (this);
1379 1432
1380 last_establish_attempt = 0.; 1433 last_establish_attempt = 0.;
1381 octx = ictx = 0; 1434 octx = ictx = 0;
1382 1435
1383 if (!conf->protocols) // make sure some protocol is enabled
1384 conf->protocols = PROT_UDPv4;
1385
1386 connectmode = conf->connectmode; 1436 connectmode = conf->connectmode;
1387 1437
1388 // queue a dummy packet to force an initial connection attempt 1438 // queue a dummy packet to force an initial connection attempt
1389 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) 1439 if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1390 vpn_queue.put (new net_packet); 1440 vpn_queue.put (new net_packet);
… …
1395connection::~connection () 1445connection::~connection ()
1396{ 1446{
1397 shutdown (); 1447 shutdown ();
1398} 1448}
1399 1449
1450void
1400void connection_init () 1451connection_init ()
1401{ 1452{
1402 auth_rate_limiter.clear (); 1453 auth_rate_limiter.clear ();
1403 reset_rate_limiter.clear (); 1454 reset_rate_limiter.clear ();
1404} 1455}
1405 1456

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