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Comparing gvpe/src/connection.C (file contents):
Revision 1.6 by pcg, Sat Apr 5 02:32:40 2003 UTC vs.
Revision 1.63 by pcg, Sun Dec 2 00:45:41 2007 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
3 4
5 This file is part of GVPE.
6
4 This program is free software; you can redistribute it and/or modify 7 GVPE is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by 8 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 9 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 10 (at your option) any later version.
8 11
9 This program is distributed in the hope that it will be useful, 12 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details. 15 GNU General Public License for more details.
13 16
14 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
16 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17*/ 20*/
18 21
19#include "config.h" 22#include "config.h"
20
21extern "C" {
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>
29#include <openssl/rsa.h> 28#include <openssl/rsa.h>
30#include <openssl/err.h> 29#include <openssl/err.h>
31
32#include "gettext.h"
33 30
34#include "conf.h" 31#include "conf.h"
35#include "slog.h" 32#include "slog.h"
36#include "device.h" 33#include "device.h"
37#include "vpn.h" 34#include "vpn.h"
38#include "connection.h" 35#include "connection.h"
39 36
37#include "netcompat.h"
38
40#if !HAVE_RAND_PSEUDO_BYTES 39#if !HAVE_RAND_PSEUDO_BYTES
41# define RAND_pseudo_bytes RAND_bytes 40# define RAND_pseudo_bytes RAND_bytes
42#endif 41#endif
43 42
44#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 43#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
45 44
45#define ULTRA_FAST 1
46#define HLOG 15
47#include "lzf/lzf.h"
48#include "lzf/lzf_c.c"
49#include "lzf/lzf_d.c"
50
46struct crypto_ctx 51struct crypto_ctx
47{ 52{
48 EVP_CIPHER_CTX cctx; 53 EVP_CIPHER_CTX cctx;
49 HMAC_CTX hctx; 54 HMAC_CTX hctx;
50 55
… …
53}; 58};
54 59
55crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) 60crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
56{ 61{
57 EVP_CIPHER_CTX_init (&cctx); 62 EVP_CIPHER_CTX_init (&cctx);
58 EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); 63 require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
59 HMAC_CTX_init (&hctx); 64 HMAC_CTX_init (&hctx);
60 HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); 65 HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61} 66}
62 67
63crypto_ctx::~crypto_ctx () 68crypto_ctx::~crypto_ctx ()
64{ 69{
65 EVP_CIPHER_CTX_cleanup (&cctx); 70 require (EVP_CIPHER_CTX_cleanup (&cctx));
66 HMAC_CTX_cleanup (&hctx); 71 HMAC_CTX_cleanup (&hctx);
67} 72}
68 73
69static void 74static void
70rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) 75rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
71{ 76{
72 EVP_MD_CTX ctx; 77 EVP_MD_CTX ctx;
73 78
74 EVP_MD_CTX_init (&ctx); 79 EVP_MD_CTX_init (&ctx);
75 EVP_DigestInit (&ctx, RSA_HASH); 80 require (EVP_DigestInit (&ctx, RSA_HASH));
76 EVP_DigestUpdate(&ctx, &chg, sizeof chg); 81 require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
77 EVP_DigestUpdate(&ctx, &id, sizeof id); 82 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
78 EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); 83 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
79 EVP_MD_CTX_cleanup (&ctx); 84 EVP_MD_CTX_cleanup (&ctx);
80} 85}
81 86
82struct rsa_entry { 87struct rsa_entry
88{
83 tstamp expire; 89 tstamp expire;
84 rsaid id; 90 rsaid id;
85 rsachallenge chg; 91 rsachallenge chg;
86}; 92};
87 93
88struct rsa_cache : list<rsa_entry> 94struct rsa_cache : list<rsa_entry>
89{ 95{
90 void cleaner_cb (time_watcher &w); time_watcher cleaner; 96 void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
91 97
92 bool find (const rsaid &id, rsachallenge &chg) 98 bool find (const rsaid &id, rsachallenge &chg)
93 { 99 {
94 for (iterator i = begin (); i != end (); ++i) 100 for (iterator i = begin (); i != end (); ++i)
95 { 101 {
96 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 102 if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
97 { 103 {
98 memcpy (&chg, &i->chg, sizeof chg); 104 memcpy (&chg, &i->chg, sizeof chg);
99 105
100 erase (i); 106 erase (i);
101 return true; 107 return true;
102 } 108 }
103 } 109 }
104 110
105 if (cleaner.at < NOW) 111 if (!cleaner.is_active ())
106 cleaner.start (NOW + RSA_TTL); 112 cleaner.again ();
107 113
108 return false; 114 return false;
109 } 115 }
110 116
111 void gen (rsaid &id, rsachallenge &chg) 117 void gen (rsaid &id, rsachallenge &chg)
112 { 118 {
113 rsa_entry e; 119 rsa_entry e;
114 120
115 RAND_bytes ((unsigned char *)&id, sizeof id); 121 RAND_bytes ((unsigned char *)&id, sizeof id);
116 RAND_bytes ((unsigned char *)&chg, sizeof chg); 122 RAND_bytes ((unsigned char *)&chg, sizeof chg);
117 123
118 e.expire = NOW + RSA_TTL; 124 e.expire = ev_now () + RSA_TTL;
119 e.id = id; 125 e.id = id;
120 memcpy (&e.chg, &chg, sizeof chg); 126 memcpy (&e.chg, &chg, sizeof chg);
121 127
122 push_back (e); 128 push_back (e);
123 129
124 if (cleaner.at < NOW) 130 if (!cleaner.is_active ())
125 cleaner.start (NOW + RSA_TTL); 131 cleaner.again ();
126 } 132 }
127 133
128 rsa_cache () 134 rsa_cache ()
129 : cleaner (this, &rsa_cache::cleaner_cb) 135 : cleaner (this, &rsa_cache::cleaner_cb)
130 { } 136 {
137 cleaner.set (RSA_TTL, RSA_TTL);
138 }
131 139
132} rsa_cache; 140} rsa_cache;
133 141
134void rsa_cache::cleaner_cb (time_watcher &w) 142void rsa_cache::cleaner_cb (ev::timer &w, int revents)
135{ 143{
136 if (empty ()) 144 if (empty ())
137 w.at = TSTAMP_CANCEL; 145 w.stop ();
138 else 146 else
139 { 147 {
140 w.at = NOW + RSA_TTL;
141
142 for (iterator i = begin (); i != end (); ) 148 for (iterator i = begin (); i != end (); )
143 if (i->expire <= NOW) 149 if (i->expire <= ev_now ())
144 i = erase (i); 150 i = erase (i);
145 else 151 else
146 ++i; 152 ++i;
147 } 153 }
148} 154}
149 155
150////////////////////////////////////////////////////////////////////////////// 156//////////////////////////////////////////////////////////////////////////////
151 157
152void pkt_queue::put (tap_packet *p) 158void pkt_queue::put (net_packet *p)
153{ 159{
154 if (queue[i]) 160 if (queue[i])
155 { 161 {
156 delete queue[i]; 162 delete queue[i];
157 j = (j + 1) % QUEUEDEPTH; 163 j = (j + 1) % QUEUEDEPTH;
… …
160 queue[i] = p; 166 queue[i] = p;
161 167
162 i = (i + 1) % QUEUEDEPTH; 168 i = (i + 1) % QUEUEDEPTH;
163} 169}
164 170
165tap_packet *pkt_queue::get () 171net_packet *pkt_queue::get ()
166{ 172{
167 tap_packet *p = queue[j]; 173 net_packet *p = queue[j];
168 174
169 if (p) 175 if (p)
170 { 176 {
171 queue[j] = 0; 177 queue[j] = 0;
172 j = (j + 1) % QUEUEDEPTH; 178 j = (j + 1) % QUEUEDEPTH;
… …
186{ 192{
187 for (i = QUEUEDEPTH; --i > 0; ) 193 for (i = QUEUEDEPTH; --i > 0; )
188 delete queue[i]; 194 delete queue[i];
189} 195}
190 196
191struct net_rateinfo { 197struct net_rateinfo
198{
192 u32 host; 199 u32 host;
193 double pcnt, diff; 200 double pcnt, diff;
194 tstamp last; 201 tstamp last;
195}; 202};
196 203
197// only do action once every x seconds per host whole allowing bursts. 204// only do action once every x seconds per host whole allowing bursts.
198// this implementation ("splay list" ;) is inefficient, 205// this implementation ("splay list" ;) is inefficient,
199// but low on resources. 206// but low on resources.
200struct net_rate_limiter : list<net_rateinfo> 207struct net_rate_limiter : list<net_rateinfo>
201{ 208{
202 static const double ALPHA = 1. - 1. / 90.; // allow bursts 209# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203 static const double CUTOFF = 20.; // one event every CUTOFF seconds 210# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time 211# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
212# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205 213
206 bool can (const sockinfo &si) { return can((u32)si.host); } 214 bool can (const sockinfo &si) { return can((u32)si.host); }
207 bool can (u32 host); 215 bool can (u32 host);
208}; 216};
209 217
210net_rate_limiter auth_rate_limiter, reset_rate_limiter; 218net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211 219
… …
214 iterator i; 222 iterator i;
215 223
216 for (i = begin (); i != end (); ) 224 for (i = begin (); i != end (); )
217 if (i->host == host) 225 if (i->host == host)
218 break; 226 break;
219 else if (i->last < NOW - EXPIRE) 227 else if (i->last < ev_now () - NRL_EXPIRE)
220 i = erase (i); 228 i = erase (i);
221 else 229 else
222 i++; 230 i++;
223 231
224 if (i == end ()) 232 if (i == end ())
225 { 233 {
226 net_rateinfo ri; 234 net_rateinfo ri;
227 235
228 ri.host = host; 236 ri.host = host;
229 ri.pcnt = 1.; 237 ri.pcnt = 1.;
230 ri.diff = CUTOFF * (1. / (1. - ALPHA)); 238 ri.diff = NRL_MAXDIF;
231 ri.last = NOW; 239 ri.last = ev_now ();
232 240
233 push_front (ri); 241 push_front (ri);
234 242
235 return true; 243 return true;
236 } 244 }
237 else 245 else
238 { 246 {
239 net_rateinfo ri (*i); 247 net_rateinfo ri (*i);
240 erase (i); 248 erase (i);
241 249
242 ri.pcnt = ri.pcnt * ALPHA; 250 ri.pcnt = ri.pcnt * NRL_ALPHA;
243 ri.diff = ri.diff * ALPHA + (NOW - ri.last); 251 ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244 252
245 ri.last = NOW; 253 ri.last = ev_now ();
246 254
255 double dif = ri.diff / ri.pcnt;
256
247 bool send = ri.diff / ri.pcnt > CUTOFF; 257 bool send = dif > NRL_CUTOFF;
248 258
259 if (dif > NRL_MAXDIF)
260 {
261 ri.pcnt = 1.;
262 ri.diff = NRL_MAXDIF;
263 }
249 if (send) 264 else if (send)
250 ri.pcnt++; 265 ri.pcnt++;
251 266
252 push_front (ri); 267 push_front (ri);
253 268
254 return send; 269 return send;
… …
299} 314}
300 315
301#define MAXVPNDATA (MAX_MTU - 6 - 6) 316#define MAXVPNDATA (MAX_MTU - 6 - 6)
302#define DATAHDR (sizeof (u32) + RAND_SIZE) 317#define DATAHDR (sizeof (u32) + RAND_SIZE)
303 318
304struct vpndata_packet:vpn_packet 319struct vpndata_packet : vpn_packet
305 { 320 {
306 u8 data[MAXVPNDATA + DATAHDR]; // seqno 321 u8 data[MAXVPNDATA + DATAHDR]; // seqno
307 322
308 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); 323 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
309 tap_packet *unpack (connection *conn, u32 &seqno); 324 tap_packet *unpack (connection *conn, u32 &seqno);
… …
322 int outl = 0, outl2; 337 int outl = 0, outl2;
323 ptype type = PT_DATA_UNCOMPRESSED; 338 ptype type = PT_DATA_UNCOMPRESSED;
324 339
325#if ENABLE_COMPRESSION 340#if ENABLE_COMPRESSION
326 u8 cdata[MAX_MTU]; 341 u8 cdata[MAX_MTU];
327 u32 cl;
328 342
343 if (conn->features & ENABLE_COMPRESSION)
344 {
329 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 345 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346
330 if (cl) 347 if (cl)
331 { 348 {
332 type = PT_DATA_COMPRESSED; 349 type = PT_DATA_COMPRESSED;
333 d = cdata; 350 d = cdata;
334 l = cl + 2; 351 l = cl + 2;
335 352
336 d[0] = cl >> 8; 353 d[0] = cl >> 8;
337 d[1] = cl; 354 d[1] = cl;
355 }
338 } 356 }
339#endif 357#endif
340 358
341 EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); 359 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
342 360
343 struct { 361 struct {
344#if RAND_SIZE 362#if RAND_SIZE
345 u8 rnd[RAND_SIZE]; 363 u8 rnd[RAND_SIZE];
346#endif 364#endif
… …
350 datahdr.seqno = ntohl (seqno); 368 datahdr.seqno = ntohl (seqno);
351#if RAND_SIZE 369#if RAND_SIZE
352 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); 370 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
353#endif 371#endif
354 372
355 EVP_EncryptUpdate (cctx, 373 require (EVP_EncryptUpdate (cctx,
356 (unsigned char *) data + outl, &outl2, 374 (unsigned char *) data + outl, &outl2,
357 (unsigned char *) &datahdr, DATAHDR); 375 (unsigned char *) &datahdr, DATAHDR));
358 outl += outl2; 376 outl += outl2;
359 377
360 EVP_EncryptUpdate (cctx, 378 require (EVP_EncryptUpdate (cctx,
361 (unsigned char *) data + outl, &outl2, 379 (unsigned char *) data + outl, &outl2,
362 (unsigned char *) d, l); 380 (unsigned char *) d, l));
363 outl += outl2; 381 outl += outl2;
364 382
365 EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); 383 require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366 outl += outl2; 384 outl += outl2;
367 385
368 len = outl + data_hdr_size (); 386 len = outl + data_hdr_size ();
369 387
370 set_hdr (type, dst); 388 set_hdr (type, dst);
… …
379 int outl = 0, outl2; 397 int outl = 0, outl2;
380 tap_packet *p = new tap_packet; 398 tap_packet *p = new tap_packet;
381 u8 *d; 399 u8 *d;
382 u32 l = len - data_hdr_size (); 400 u32 l = len - data_hdr_size ();
383 401
384 EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); 402 require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
385 403
386#if ENABLE_COMPRESSION 404#if ENABLE_COMPRESSION
387 u8 cdata[MAX_MTU]; 405 u8 cdata[MAX_MTU];
388 406
389 if (type == PT_DATA_COMPRESSED) 407 if (type == PT_DATA_COMPRESSED)
… …
391 else 409 else
392#endif 410#endif
393 d = &(*p)[6 + 6 - DATAHDR]; 411 d = &(*p)[6 + 6 - DATAHDR];
394 412
395 /* this overwrites part of the src mac, but we fix that later */ 413 /* this overwrites part of the src mac, but we fix that later */
396 EVP_DecryptUpdate (cctx, 414 require (EVP_DecryptUpdate (cctx,
397 d, &outl2, 415 d, &outl2,
398 (unsigned char *)&data, len - data_hdr_size ()); 416 (unsigned char *)&data, len - data_hdr_size ()));
399 outl += outl2; 417 outl += outl2;
400 418
401 EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); 419 require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402 outl += outl2; 420 outl += outl2;
403 421
404 seqno = ntohl (*(u32 *)(d + RAND_SIZE)); 422 seqno = ntohl (*(u32 *)(d + RAND_SIZE));
405 423
406 id2mac (dst () ? dst() : THISNODE->id, p->dst); 424 id2mac (dst () ? dst() : THISNODE->id, p->dst);
… …
435{ 453{
436 // actually, hmaclen cannot be checked because the hmac 454 // actually, hmaclen cannot be checked because the hmac
437 // field comes before this data, so peers with other 455 // field comes before this data, so peers with other
438 // hmacs simply will not work. 456 // hmacs simply will not work.
439 u8 prot_major, prot_minor, randsize, hmaclen; 457 u8 prot_major, prot_minor, randsize, hmaclen;
440 u8 flags, challengelen, pad2, pad3; 458 u8 flags, challengelen, features, pad3;
441 u32 cipher_nid, digest_nid, hmac_nid; 459 u32 cipher_nid, digest_nid, hmac_nid;
442
443 const u8 curflags () const
444 {
445 return 0x80
446 | (ENABLE_COMPRESSION ? 0x01 : 0x00);
447 }
448 460
449 void setup (ptype type, int dst); 461 void setup (ptype type, int dst);
450 bool chk_config () const; 462 bool chk_config () const;
463
464 static u8 get_features ()
465 {
466 u8 f = 0;
467#if ENABLE_COMPRESSION
468 f |= FEATURE_COMPRESSION;
469#endif
470#if ENABLE_ROHC
471 f |= FEATURE_ROHC;
472#endif
473#if ENABLE_BRIDGING
474 f |= FEATURE_BRIDGING;
475#endif
476 return f;
477 }
451}; 478};
452 479
453void config_packet::setup (ptype type, int dst) 480void config_packet::setup (ptype type, int dst)
454{ 481{
455 prot_major = PROTOCOL_MAJOR; 482 prot_major = PROTOCOL_MAJOR;
456 prot_minor = PROTOCOL_MINOR; 483 prot_minor = PROTOCOL_MINOR;
457 randsize = RAND_SIZE; 484 randsize = RAND_SIZE;
458 hmaclen = HMACLENGTH; 485 hmaclen = HMACLENGTH;
459 flags = curflags (); 486 flags = 0;
460 challengelen = sizeof (rsachallenge); 487 challengelen = sizeof (rsachallenge);
488 features = get_features ();
461 489
462 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 490 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
463 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 491 digest_nid = htonl (EVP_MD_type (RSA_HASH));
464 hmac_nid = htonl (EVP_MD_type (DIGEST)); 492 hmac_nid = htonl (EVP_MD_type (DIGEST));
465 493
… …
467 set_hdr (type, dst); 495 set_hdr (type, dst);
468} 496}
469 497
470bool config_packet::chk_config () const 498bool config_packet::chk_config () const
471{ 499{
472 return prot_major == PROTOCOL_MAJOR 500 if (prot_major != PROTOCOL_MAJOR)
473 && randsize == RAND_SIZE 501 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474 && hmaclen == HMACLENGTH 502 else if (randsize != RAND_SIZE)
475 && flags == curflags () 503 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
504 else if (hmaclen != HMACLENGTH)
505 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
476 && challengelen == sizeof (rsachallenge) 506 else if (challengelen != sizeof (rsachallenge))
507 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
477 && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) 508 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
509 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
478 && digest_nid == htonl (EVP_MD_type (RSA_HASH)) 510 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
511 slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
479 && hmac_nid == htonl (EVP_MD_type (DIGEST)); 512 else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
513 slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
514 else
515 return true;
516
517 return false;
480} 518}
481 519
482struct auth_req_packet : config_packet 520struct auth_req_packet : config_packet
483{ 521{
484 char magic[8]; 522 char magic[8];
485 u8 initiate; // false if this is just an automatic reply 523 u8 initiate; // false if this is just an automatic reply
486 u8 protocols; // supported protocols (will get patches on forward) 524 u8 protocols; // supported protocols (will be patched on forward)
487 u8 pad2, pad3; 525 u8 pad2, pad3;
488 rsaid id; 526 rsaid id;
489 rsaencrdata encr; 527 rsaencrdata encr;
490 528
491 auth_req_packet (int dst, bool initiate_, u8 protocols_) 529 auth_req_packet (int dst, bool initiate_, u8 protocols_)
… …
546}; 584};
547 585
548///////////////////////////////////////////////////////////////////////////// 586/////////////////////////////////////////////////////////////////////////////
549 587
550void 588void
589connection::connection_established ()
590{
591 slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
592
593 if (ictx && octx)
594 {
595 connectmode = conf->connectmode;
596
597 // make sure rekeying timeouts are slightly asymmetric
598 ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
599 rekey.start (rekey_interval, rekey_interval);
600 keepalive.start (::conf.keepalive);
601
602 // send queued packets
603 if (ictx && octx)
604 {
605 while (tap_packet *p = (tap_packet *)data_queue.get ())
606 {
607 send_data_packet (p);
608 delete p;
609 }
610
611 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
612 {
613 send_vpn_packet (p, si, IPTOS_RELIABILITY);
614 delete p;
615 }
616 }
617 }
618 else
619 {
620 retry_cnt = 0;
621 establish_connection.start (5);
622 keepalive.stop ();
623 rekey.stop ();
624 }
625}
626
627void
551connection::reset_dstaddr () 628connection::reset_si ()
552{ 629{
553 protocol = best_protocol (THISNODE->protocols & conf->protocols); 630 protocol = best_protocol (THISNODE->protocols & conf->protocols);
554 631
555 // mask out protocols we cannot establish 632 // mask out protocols we cannot establish
556 if (!conf->udp_port) protocol &= ~PROT_UDPv4; 633 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
557 if (!conf->tcp_port) protocol &= ~PROT_TCPv4; 634 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
635 if (!conf->dns_port) protocol &= ~PROT_DNSv4;
636
637 if (protocol
638 && (!conf->can_direct (THISNODE)
639 || !THISNODE->can_direct (conf)))
640 {
641 slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);
642 protocol = 0;
643 }
558 644
559 si.set (conf, protocol); 645 si.set (conf, protocol);
560} 646}
561 647
562void 648// ensure sockinfo is valid, forward if necessary
563connection::send_ping (const sockinfo &si, u8 pong) 649const sockinfo &
564{
565 ping_packet *pkt = new ping_packet;
566
567 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
568 vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
569
570 delete pkt;
571}
572
573void
574connection::send_reset (const sockinfo &si) 650connection::forward_si (const sockinfo &si) const
575{ 651{
576 if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) 652 if (!si.valid ())
577 {
578 config_packet *pkt = new config_packet;
579
580 pkt->setup (vpn_packet::PT_RESET, conf->id);
581 vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);
582
583 delete pkt;
584 } 653 {
585} 654 connection *r = vpn->find_router ();
586 655
587void 656 if (r)
588connection::send_auth_request (const sockinfo &si, bool initiate)
589{
590 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
591
592 rsachallenge chg;
593
594 rsa_cache.gen (pkt->id, chg);
595
596 if (0 > RSA_public_encrypt (sizeof chg,
597 (unsigned char *)&chg, (unsigned char *)&pkt->encr,
598 conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
599 fatal ("RSA_public_encrypt error");
600
601 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
602
603 vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
604
605 delete pkt;
606}
607
608void
609connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
610{
611 auth_res_packet *pkt = new auth_res_packet (conf->id);
612
613 pkt->id = id;
614
615 rsa_hash (id, chg, pkt->response);
616
617 pkt->hmac_set (octx);
618
619 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
620
621 vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
622
623 delete pkt;
624}
625
626void
627connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
628{
629 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
630 conf->id, rid, (const char *)rsi);
631
632 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
633
634 r->hmac_set (octx);
635 vpn->send_vpn_packet (r, si);
636
637 delete r;
638}
639
640void
641connection::establish_connection_cb (time_watcher &w)
642{
643 if (ictx || conf == THISNODE
644 || connectmode == conf_node::C_NEVER
645 || connectmode == conf_node::C_DISABLED)
646 w.at = TSTAMP_CANCEL;
647 else if (w.at <= NOW)
648 {
649 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
650
651 if (retry_int < 3600 * 8)
652 retry_cnt++;
653
654 w.at = NOW + retry_int;
655
656 if (conf->hostname)
657 { 657 {
658 reset_dstaddr (); 658 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
659 659 conf->nodename, r->conf->nodename, (const char *)r->si);
660 if (si.valid () && auth_rate_limiter.can (si)) 660 return r->si;
661 {
662 if (retry_cnt < 4)
663 send_auth_request (si, true);
664 else
665 send_ping (si, 0);
666 }
667 } 661 }
668 else 662 else
663 slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
664 conf->nodename);
665 }
666
667 return si;
668}
669
670void
671connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
672{
673 if (!vpn->send_vpn_packet (pkt, si, tos))
674 reset_connection ();
675}
676
677void
678connection::send_ping (const sockinfo &si, u8 pong)
679{
680 ping_packet *pkt = new ping_packet;
681
682 pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
683 send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
684
685 delete pkt;
686}
687
688void
689connection::send_reset (const sockinfo &si)
690{
691 if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
692 {
693 config_packet *pkt = new config_packet;
694
695 pkt->setup (vpn_packet::PT_RESET, conf->id);
696 send_vpn_packet (pkt, si, IPTOS_MINCOST);
697
698 delete pkt;
699 }
700}
701
702void
703connection::send_auth_request (const sockinfo &si, bool initiate)
704{
705 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
706
707 rsachallenge chg;
708 rsa_cache.gen (pkt->id, chg);
709 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
710
711 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
712
713 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
714
715 delete pkt;
716}
717
718void
719connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
720{
721 auth_res_packet *pkt = new auth_res_packet (conf->id);
722
723 pkt->id = id;
724
725 rsa_hash (id, chg, pkt->response);
726
727 pkt->hmac_set (octx);
728
729 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
730
731 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
732
733 delete pkt;
734}
735
736void
737connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
738{
739 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",
740 conf->id, rid, (const char *)rsi);
741
742 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
743
744 r->hmac_set (octx);
745 send_vpn_packet (r, si);
746
747 delete r;
748}
749
750void
751connection::establish_connection_cb (ev::timer &w, int revents)
752{
753 if (!ictx
754 && conf != THISNODE
755 && connectmode != conf_node::C_NEVER
756 && connectmode != conf_node::C_DISABLED
757 && !w.is_active ())
758 {
759 ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
760 ? (retry_cnt & 3) + 1
761 : 1 << (retry_cnt >> 2));
762
763 reset_si ();
764
765 bool slow = si.prot & PROT_SLOW;
766
767 if (si.prot && !si.host)
768 {
769 slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
770 /*TODO*/ /* start the timer so we don't recurse endlessly */
771 w.start (1);
669 vpn->connect_request (conf->id); 772 vpn->send_connect_request (conf->id);
773 }
774 else
775 {
776 slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);
777
778 const sockinfo &dsi = forward_si (si);
779
780 slow = slow || (dsi.prot & PROT_SLOW);
781
782 if (dsi.valid () && auth_rate_limiter.can (dsi))
783 {
784 if (retry_cnt < 4)
785 send_auth_request (dsi, true);
786 else
787 send_ping (dsi, 0);
788 }
789 }
790
791 retry_int *= slow ? 8. : 0.7;
792
793 if (retry_int < conf->max_retry)
794 retry_cnt++;
795 else
796 retry_int = conf->max_retry;
797
798 w.start (retry_int);
670 } 799 }
671} 800}
672 801
673void 802void
674connection::reset_connection () 803connection::reset_connection ()
… …
677 { 806 {
678 slog (L_INFO, _("%s(%s): connection lost"), 807 slog (L_INFO, _("%s(%s): connection lost"),
679 conf->nodename, (const char *)si); 808 conf->nodename, (const char *)si);
680 809
681 if (::conf.script_node_down) 810 if (::conf.script_node_down)
682 run_script (run_script_cb (this, &connection::script_node_down), false); 811 if (!run_script (run_script_cb (this, &connection::script_node_down), false))
812 slog (L_WARN, _("node-down command execution failed, continuing."));
683 } 813 }
684 814
685 delete ictx; ictx = 0; 815 delete ictx; ictx = 0;
686 delete octx; octx = 0; 816 delete octx; octx = 0;
817#if ENABLE_DNS
818 dnsv4_reset_connection ();
819#endif
687 820
688 si.host= 0; 821 si.host = 0;
689 822
690 last_activity = 0; 823 last_activity = 0;
691 retry_cnt = 0; 824 retry_cnt = 0;
692 825
693 rekey.reset (); 826 rekey.stop ();
694 keepalive.reset (); 827 keepalive.stop ();
695 establish_connection.reset (); 828 establish_connection.stop ();
696} 829}
697 830
698void 831void
699connection::shutdown () 832connection::shutdown ()
700{ 833{
… …
703 836
704 reset_connection (); 837 reset_connection ();
705} 838}
706 839
707void 840void
708connection::rekey_cb (time_watcher &w) 841connection::rekey_cb (ev::timer &w, int revents)
709{ 842{
710 w.at = TSTAMP_CANCEL;
711
712 reset_connection (); 843 reset_connection ();
713 establish_connection (); 844 establish_connection ();
714} 845}
715 846
716void 847void
717connection::send_data_packet (tap_packet *pkt, bool broadcast) 848connection::send_data_packet (tap_packet *pkt)
718{ 849{
719 vpndata_packet *p = new vpndata_packet; 850 vpndata_packet *p = new vpndata_packet;
720 int tos = 0; 851 int tos = 0;
721 852
722 if (conf->inherit_tos 853 // I am not hilarious about peeking into packets, but so be it.
723 && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP 854 if (conf->inherit_tos && pkt->is_ipv4 ())
724 && ((*pkt)[14] & 0xf0) == 0x40) // IPv4
725 tos = (*pkt)[15] & IPTOS_TOS_MASK; 855 tos = (*pkt)[15] & IPTOS_TOS_MASK;
726 856
727 p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs 857 p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
728 vpn->send_vpn_packet (p, si, tos); 858 send_vpn_packet (p, si, tos);
729 859
730 delete p; 860 delete p;
731 861
732 if (oseqno > MAX_SEQNO) 862 if (oseqno > MAX_SEQNO)
733 rekey (); 863 rekey ();
734} 864}
735 865
736void 866void
737connection::inject_data_packet (tap_packet *pkt, bool broadcast) 867connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)
738{ 868{
739 if (ictx && octx) 869 if (ictx && octx)
740 send_data_packet (pkt, broadcast); 870 send_data_packet (pkt);
741 else 871 else
742 { 872 {
743 if (!broadcast)//DDDD 873 if (!broadcast)
744 queue.put (new tap_packet (*pkt)); 874 data_queue.put (new tap_packet (*pkt));
745 875
746 establish_connection (); 876 establish_connection ();
747 } 877 }
748} 878}
749 879
880void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
881{
882 if (ictx && octx)
883 send_vpn_packet (pkt, si, tos);
884 else
885 {
886 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
887
888 establish_connection ();
889 }
890}
891
750void 892void
751connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) 893connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
752{ 894{
753 last_activity = NOW; 895 last_activity = ev_now ();
754 896
755 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 897 slog (L_NOISE, "<<%d received packet type %d from %d to %d",
756 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 898 conf->id, pkt->typ (), pkt->src (), pkt->dst ());
899
900 if (connectmode == conf_node::C_DISABLED)
901 return;
757 902
758 switch (pkt->typ ()) 903 switch (pkt->typ ())
759 { 904 {
760 case vpn_packet::PT_PING: 905 case vpn_packet::PT_PING:
761 // we send pings instead of auth packets after some retries, 906 // we send pings instead of auth packets after some retries,
… …
808 if (p->initiate) 953 if (p->initiate)
809 send_auth_request (rsi, false); 954 send_auth_request (rsi, false);
810 955
811 rsachallenge k; 956 rsachallenge k;
812 957
813 if (0 > RSA_private_decrypt (sizeof (p->encr), 958 if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
814 (unsigned char *)&p->encr, (unsigned char *)&k, 959 {
815 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
816 slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), 960 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
817 conf->nodename, (const char *)rsi); 961 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
962 break;
963 }
818 else 964 else
819 { 965 {
820 retry_cnt = 0;
821 establish_connection.start (NOW + 8); //? ;)
822 keepalive.reset ();
823 rekey.reset ();
824
825 delete ictx;
826 ictx = 0;
827
828 delete octx; 966 delete octx;
829 967
830 octx = new crypto_ctx (k, 1); 968 octx = new crypto_ctx (k, 1);
831 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 969 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
832 970
833 conf->protocols = p->protocols; 971 conf->protocols = p->protocols;
972 features = p->features & config_packet::get_features ();
973
834 send_auth_response (rsi, p->id, k); 974 send_auth_response (rsi, p->id, k);
975
976 connection_established ();
835 977
836 break; 978 break;
837 } 979 }
838 } 980 }
981 else
982 slog (L_WARN, _("%s(%s): protocol mismatch"),
983 conf->nodename, (const char *)rsi);
839 984
840 send_reset (rsi); 985 send_reset (rsi);
841 } 986 }
842 987
843 break; 988 break;
… …
856 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 1001 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
857 1002
858 rsachallenge chg; 1003 rsachallenge chg;
859 1004
860 if (!rsa_cache.find (p->id, chg)) 1005 if (!rsa_cache.find (p->id, chg))
1006 {
861 slog (L_ERR, _("%s(%s): unrequested auth response"), 1007 slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
862 conf->nodename, (const char *)rsi); 1008 conf->nodename, (const char *)rsi);
1009 break;
1010 }
863 else 1011 else
864 { 1012 {
865 crypto_ctx *cctx = new crypto_ctx (chg, 0); 1013 crypto_ctx *cctx = new crypto_ctx (chg, 0);
866 1014
867 if (!p->hmac_chk (cctx)) 1015 if (!p->hmac_chk (cctx))
1016 {
868 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 1017 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
869 "could be an attack, or just corruption or an synchronization error"), 1018 "could be an attack, or just corruption or a synchronization error"),
870 conf->nodename, (const char *)rsi); 1019 conf->nodename, (const char *)rsi);
1020 break;
1021 }
871 else 1022 else
872 { 1023 {
873 rsaresponse h; 1024 rsaresponse h;
874 1025
875 rsa_hash (p->id, chg, h); 1026 rsa_hash (p->id, chg, h);
… …
881 delete ictx; ictx = cctx; 1032 delete ictx; ictx = cctx;
882 1033
883 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid 1034 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
884 1035
885 si = rsi; 1036 si = rsi;
1037 protocol = rsi.prot;
886 1038
887 rekey.start (NOW + ::conf.rekey); 1039 connection_established ();
888 keepalive.start (NOW + ::conf.keepalive);
889 1040
890 // send queued packets
891 while (tap_packet *p = queue.get ())
892 {
893 send_data_packet (p);
894 delete p;
895 }
896
897 connectmode = conf->connectmode;
898
899 slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"), 1041 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
900 conf->nodename, (const char *)rsi, 1042 conf->nodename, (const char *)rsi,
901 strprotocol (protocol),
902 p->prot_major, p->prot_minor); 1043 p->prot_major, p->prot_minor);
903 1044
904 if (::conf.script_node_up) 1045 if (::conf.script_node_up)
905 run_script (run_script_cb (this, &connection::script_node_up), false); 1046 if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1047 slog (L_WARN, _("node-up command execution failed, continuing."));
906 1048
907 break; 1049 break;
908 } 1050 }
909 else 1051 else
910 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1052 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
… …
929 1071
930 if (ictx && octx) 1072 if (ictx && octx)
931 { 1073 {
932 vpndata_packet *p = (vpndata_packet *)pkt; 1074 vpndata_packet *p = (vpndata_packet *)pkt;
933 1075
934 if (rsi == si) 1076 if (!p->hmac_chk (ictx))
1077 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1078 "could be an attack, or just corruption or a synchronization error"),
1079 conf->nodename, (const char *)rsi);
1080 else
935 { 1081 {
936 if (!p->hmac_chk (ictx))
937 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
938 "could be an attack, or just corruption or an synchronization error"),
939 conf->nodename, (const char *)rsi);
940 else 1082 u32 seqno;
1083 tap_packet *d = p->unpack (this, seqno);
1084
1085 if (iseqno.recv_ok (seqno))
941 { 1086 {
942 u32 seqno; 1087 vpn->tap->send (d);
943 tap_packet *d = p->unpack (this, seqno);
944 1088
945 if (iseqno.recv_ok (seqno)) 1089 if (si != rsi)
946 { 1090 {
947 vpn->tap->send (d); 1091 // fast re-sync on source address changes, useful especially for tcp/ip
948
949 if (p->dst () == 0) // re-broadcast
950 for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
951 {
952 connection *c = *i;
953
954 if (c->conf != THISNODE && c->conf != conf)
955 c->inject_data_packet (d);
956 }
957
958 delete d;
959
960 break; 1092 si = rsi;
1093
1094 slog (L_INFO, _("%s(%s): socket address changed to %s"),
1095 conf->nodename, (const char *)si, (const char *)rsi);
961 } 1096 }
962 } 1097 }
1098
1099 delete d;
1100 break;
963 } 1101 }
964 else
965 slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
966 } 1102 }
967 1103
968 send_reset (rsi); 1104 send_reset (rsi);
969 break; 1105 break;
970 1106
971 case vpn_packet::PT_CONNECT_REQ: 1107 case vpn_packet::PT_CONNECT_REQ:
972 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1108 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
973 { 1109 {
974 connect_req_packet *p = (connect_req_packet *) pkt; 1110 connect_req_packet *p = (connect_req_packet *) pkt;
975 1111
976 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1112 if (p->id > 0 && p->id <= vpn->conns.size ())
977 conf->protocols = p->protocols;
978 connection *c = vpn->conns[p->id - 1];
979
980 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
981 conf->id, p->id, c->ictx && c->octx);
982
983 if (c->ictx && c->octx)
984 { 1113 {
1114 connection *c = vpn->conns[p->id - 1];
1115 conf->protocols = p->protocols;
1116
1117 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",
1118 conf->id, p->id, c->ictx && c->octx);
1119
1120 if (c->ictx && c->octx)
1121 {
985 // send connect_info packets to both sides, in case one is 1122 // send connect_info packets to both sides, in case one is
986 // behind a nat firewall (or both ;) 1123 // behind a nat firewall (or both ;)
987 c->send_connect_info (conf->id, si, conf->protocols); 1124 c->send_connect_info (conf->id, si, conf->protocols);
988 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1125 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1126 }
1127 else
1128 c->establish_connection ();
989 } 1129 }
1130 else
1131 slog (L_WARN,
1132 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1133 p->id);
990 } 1134 }
991 1135
992 break; 1136 break;
993 1137
994 case vpn_packet::PT_CONNECT_INFO: 1138 case vpn_packet::PT_CONNECT_INFO:
995 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1139 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
996 { 1140 {
997 connect_info_packet *p = (connect_info_packet *) pkt; 1141 connect_info_packet *p = (connect_info_packet *)pkt;
998 1142
999 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1143 if (p->id > 0 && p->id <= vpn->conns.size ())
1000 conf->protocols = p->protocols; 1144 {
1001 connection *c = vpn->conns[p->id - 1]; 1145 connection *c = vpn->conns[p->id - 1];
1002 1146
1147 c->conf->protocols = p->protocols;
1148 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1149 p->si.upgrade_protocol (protocol, c->conf);
1150
1003 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1151 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1004 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1152 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1005 1153
1154 const sockinfo &dsi = forward_si (p->si);
1155
1156 if (dsi.valid ())
1006 c->send_auth_request (p->si, true); 1157 c->send_auth_request (dsi, true);
1158 }
1159 else
1160 slog (L_WARN,
1161 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1162 p->id);
1007 } 1163 }
1008 1164
1009 break; 1165 break;
1010 1166
1011 default: 1167 default:
1012 send_reset (rsi); 1168 send_reset (rsi);
1013 break; 1169 break;
1014 } 1170 }
1015} 1171}
1016 1172
1017void connection::keepalive_cb (time_watcher &w) 1173void connection::keepalive_cb (ev::timer &w, int revents)
1018{ 1174{
1019 if (NOW >= last_activity + ::conf.keepalive + 30) 1175 if (ev_now () >= last_activity + ::conf.keepalive + 30)
1020 { 1176 {
1021 reset_connection (); 1177 reset_connection ();
1022 establish_connection (); 1178 establish_connection ();
1023 } 1179 }
1024 else if (NOW < last_activity + ::conf.keepalive) 1180 else if (ev_now () < last_activity + ::conf.keepalive)
1025 w.at = last_activity + ::conf.keepalive; 1181 w.start (last_activity + ::conf.keepalive - ev::now ());
1026 else if (conf->connectmode != conf_node::C_ONDEMAND 1182 else if (conf->connectmode != conf_node::C_ONDEMAND
1027 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1183 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1028 { 1184 {
1029 send_ping (si); 1185 send_ping (si);
1030 w.at = NOW + 5; 1186 w.start (5);
1031 } 1187 }
1188 else if (ev_now () < last_activity + ::conf.keepalive + 10)
1189 // hold ondemand connections implicitly a few seconds longer
1190 // should delete octx, though, or something like that ;)
1191 w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1032 else 1192 else
1033 reset_connection (); 1193 reset_connection ();
1034} 1194}
1035 1195
1036void connection::connect_request (int id) 1196void connection::send_connect_request (int id)
1037{ 1197{
1038 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1198 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1039 1199
1040 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1200 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1041 p->hmac_set (octx); 1201 p->hmac_set (octx);
1042 vpn->send_vpn_packet (p, si); 1202 send_vpn_packet (p, si);
1043 1203
1044 delete p; 1204 delete p;
1045} 1205}
1046 1206
1207void connection::script_init_env (const char *ext)
1208{
1209 char *env;
1210 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1211 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1212 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1213 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1214 conf->id & 0xff); putenv (env);
1215}
1216
1047void connection::script_node () 1217void connection::script_init_connect_env ()
1048{ 1218{
1049 vpn->script_if_up (); 1219 vpn->script_init_env ();
1050 1220
1051 char *env; 1221 char *env;
1052 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1222 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1053 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1223 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1054 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1224 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1055 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1225 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1056} 1226}
1057 1227
1058const char *connection::script_node_up () 1228const char *connection::script_node_up ()
1059{ 1229{
1060 script_node (); 1230 script_init_connect_env ();
1061 1231
1062 putenv ("STATE=up"); 1232 putenv ((char *)"STATE=up");
1063 1233
1234 char *filename;
1235 asprintf (&filename,
1236 "%s/%s",
1237 confbase,
1064 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1238 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1239
1240 return filename;
1065} 1241}
1066 1242
1067const char *connection::script_node_down () 1243const char *connection::script_node_down ()
1068{ 1244{
1069 script_node (); 1245 script_init_connect_env ();
1070 1246
1071 putenv ("STATE=down"); 1247 putenv ((char *)"STATE=down");
1072 1248
1073 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1249 char *filename;
1074} 1250 asprintf (&filename,
1251 "%s/%s",
1252 confbase,
1253 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1075 1254
1255 return filename;
1256}
1257
1076connection::connection(struct vpn *vpn_) 1258connection::connection (struct vpn *vpn, conf_node *conf)
1077: vpn(vpn_) 1259: vpn(vpn), conf(conf)
1078, rekey (this, &connection::rekey_cb) 1260, rekey (this, &connection::rekey_cb)
1079, keepalive (this, &connection::keepalive_cb) 1261, keepalive (this, &connection::keepalive_cb)
1080, establish_connection (this, &connection::establish_connection_cb) 1262, establish_connection (this, &connection::establish_connection_cb)
1263#if ENABLE_DNS
1264, dns (0)
1265#endif
1081{ 1266{
1082 octx = ictx = 0; 1267 octx = ictx = 0;
1083 retry_cnt = 0; 1268 retry_cnt = 0;
1084 1269
1270 if (!conf->protocols) // make sure some protocol is enabled
1271 conf->protocols = PROT_UDPv4;
1272
1085 connectmode = conf_node::C_ALWAYS; // initial setting 1273 connectmode = conf_node::C_ALWAYS; // initial setting
1086 reset_connection (); 1274 reset_connection ();
1087} 1275}
1088 1276
1089connection::~connection () 1277connection::~connection ()

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