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Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.58 by pcg, Sat Jul 9 02:35:42 2005 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 23
21extern "C" {
22# include "lzf/lzf.h"
23}
24
25#include <list> 24#include <list>
26 25
27#include "gettext.h" 26#include <openssl/rand.h>
27#include <openssl/evp.h>
28#include <openssl/rsa.h>
29#include <openssl/err.h>
28 30
29#include "conf.h" 31#include "conf.h"
30#include "slog.h" 32#include "slog.h"
31#include "device.h" 33#include "device.h"
32#include "protocol.h" 34#include "vpn.h"
33#include "connection.h" 35#include "connection.h"
36
37#include "netcompat.h"
34 38
35#if !HAVE_RAND_PSEUDO_BYTES 39#if !HAVE_RAND_PSEUDO_BYTES
36# define RAND_pseudo_bytes RAND_bytes 40# define RAND_pseudo_bytes RAND_bytes
37#endif 41#endif
38 42
39#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 43#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
40 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
41struct crypto_ctx 51struct crypto_ctx
42{ 52{
43 EVP_CIPHER_CTX cctx; 53 EVP_CIPHER_CTX cctx;
44 HMAC_CTX hctx; 54 HMAC_CTX hctx;
45 55
… …
48}; 58};
49 59
50crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) 60crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
51{ 61{
52 EVP_CIPHER_CTX_init (&cctx); 62 EVP_CIPHER_CTX_init (&cctx);
53 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));
54 HMAC_CTX_init (&hctx); 64 HMAC_CTX_init (&hctx);
55 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);
56} 66}
57 67
58crypto_ctx::~crypto_ctx () 68crypto_ctx::~crypto_ctx ()
59{ 69{
60 EVP_CIPHER_CTX_cleanup (&cctx); 70 require (EVP_CIPHER_CTX_cleanup (&cctx));
61 HMAC_CTX_cleanup (&hctx); 71 HMAC_CTX_cleanup (&hctx);
62} 72}
63 73
64static void 74static void
65rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) 75rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
66{ 76{
67 EVP_MD_CTX ctx; 77 EVP_MD_CTX ctx;
68 78
69 EVP_MD_CTX_init (&ctx); 79 EVP_MD_CTX_init (&ctx);
70 EVP_DigestInit (&ctx, RSA_HASH); 80 require (EVP_DigestInit (&ctx, RSA_HASH));
71 EVP_DigestUpdate(&ctx, &chg, sizeof chg); 81 require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
72 EVP_DigestUpdate(&ctx, &id, sizeof id); 82 require (EVP_DigestUpdate(&ctx, &id, sizeof id));
73 EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); 83 require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
74 EVP_MD_CTX_cleanup (&ctx); 84 EVP_MD_CTX_cleanup (&ctx);
75} 85}
76 86
77struct rsa_entry { 87struct rsa_entry {
78 tstamp expire; 88 tstamp expire;
… …
80 rsachallenge chg; 90 rsachallenge chg;
81}; 91};
82 92
83struct rsa_cache : list<rsa_entry> 93struct rsa_cache : list<rsa_entry>
84{ 94{
85 void cleaner_cb (tstamp &ts); time_watcher cleaner; 95 void cleaner_cb (time_watcher &w); time_watcher cleaner;
86 96
87 bool find (const rsaid &id, rsachallenge &chg) 97 bool find (const rsaid &id, rsachallenge &chg)
88 { 98 {
89 for (iterator i = begin (); i != end (); ++i) 99 for (iterator i = begin (); i != end (); ++i)
90 { 100 {
91 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 101 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
92 { 102 {
93 memcpy (&chg, &i->chg, sizeof chg); 103 memcpy (&chg, &i->chg, sizeof chg);
94 104
95 erase (i); 105 erase (i);
96 return true; 106 return true;
97 } 107 }
98 } 108 }
99 109
100 if (cleaner.at < NOW) 110 if (cleaner.at < NOW)
101 cleaner.start (NOW + RSA_TTL); 111 cleaner.start (NOW + RSA_TTL);
102 112
103 return false; 113 return false;
104 } 114 }
105 115
106 void gen (rsaid &id, rsachallenge &chg) 116 void gen (rsaid &id, rsachallenge &chg)
107 { 117 {
108 rsa_entry e; 118 rsa_entry e;
109 119
110 RAND_bytes ((unsigned char *)&id, sizeof id); 120 RAND_bytes ((unsigned char *)&id, sizeof id);
111 RAND_bytes ((unsigned char *)&chg, sizeof chg); 121 RAND_bytes ((unsigned char *)&chg, sizeof chg);
112 122
113 e.expire = NOW + RSA_TTL; 123 e.expire = NOW + RSA_TTL;
114 e.id = id; 124 e.id = id;
115 memcpy (&e.chg, &chg, sizeof chg); 125 memcpy (&e.chg, &chg, sizeof chg);
116 126
117 push_back (e); 127 push_back (e);
118 128
119 if (cleaner.at < NOW) 129 if (cleaner.at < NOW)
120 cleaner.start (NOW + RSA_TTL); 130 cleaner.start (NOW + RSA_TTL);
121 } 131 }
122 132
123 rsa_cache () 133 rsa_cache ()
124 : cleaner (this, &rsa_cache::cleaner_cb) 134 : cleaner (this, &rsa_cache::cleaner_cb)
125 { } 135 { }
126 136
127} rsa_cache; 137} rsa_cache;
128 138
129void rsa_cache::cleaner_cb (tstamp &ts) 139void rsa_cache::cleaner_cb (time_watcher &w)
130{ 140{
131 if (empty ()) 141 if (!empty ())
132 ts = TSTAMP_CANCEL;
133 else
134 { 142 {
135 ts = NOW + RSA_TTL; 143 w.start (NOW + RSA_TTL);
136 144
137 for (iterator i = begin (); i != end (); ) 145 for (iterator i = begin (); i != end (); )
138 if (i->expire <= NOW) 146 if (i->expire <= NOW)
139 i = erase (i); 147 i = erase (i);
140 else 148 else
… …
142 } 150 }
143} 151}
144 152
145////////////////////////////////////////////////////////////////////////////// 153//////////////////////////////////////////////////////////////////////////////
146 154
147void pkt_queue::put (tap_packet *p) 155void pkt_queue::put (net_packet *p)
148{ 156{
149 if (queue[i]) 157 if (queue[i])
150 { 158 {
151 delete queue[i]; 159 delete queue[i];
152 j = (j + 1) % QUEUEDEPTH; 160 j = (j + 1) % QUEUEDEPTH;
… …
155 queue[i] = p; 163 queue[i] = p;
156 164
157 i = (i + 1) % QUEUEDEPTH; 165 i = (i + 1) % QUEUEDEPTH;
158} 166}
159 167
160tap_packet *pkt_queue::get () 168net_packet *pkt_queue::get ()
161{ 169{
162 tap_packet *p = queue[j]; 170 net_packet *p = queue[j];
163 171
164 if (p) 172 if (p)
165 { 173 {
166 queue[j] = 0; 174 queue[j] = 0;
167 j = (j + 1) % QUEUEDEPTH; 175 j = (j + 1) % QUEUEDEPTH;
… …
192// only do action once every x seconds per host whole allowing bursts. 200// only do action once every x seconds per host whole allowing bursts.
193// this implementation ("splay list" ;) is inefficient, 201// this implementation ("splay list" ;) is inefficient,
194// but low on resources. 202// but low on resources.
195struct net_rate_limiter : list<net_rateinfo> 203struct net_rate_limiter : list<net_rateinfo>
196{ 204{
197 static const double ALPHA = 1. - 1. / 90.; // allow bursts 205# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
198 static const double CUTOFF = 20.; // one event every CUTOFF seconds 206# define NRL_CUTOFF 10. // one event every CUTOFF seconds
199 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time 207# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
200 209
201 bool can (const sockinfo &si) { return can((u32)si.host); } 210 bool can (const sockinfo &si) { return can((u32)si.host); }
202 bool can (u32 host); 211 bool can (u32 host);
203}; 212};
204 213
205net_rate_limiter auth_rate_limiter, reset_rate_limiter; 214net_rate_limiter auth_rate_limiter, reset_rate_limiter;
206 215
… …
209 iterator i; 218 iterator i;
210 219
211 for (i = begin (); i != end (); ) 220 for (i = begin (); i != end (); )
212 if (i->host == host) 221 if (i->host == host)
213 break; 222 break;
214 else if (i->last < NOW - EXPIRE) 223 else if (i->last < NOW - NRL_EXPIRE)
215 i = erase (i); 224 i = erase (i);
216 else 225 else
217 i++; 226 i++;
218 227
219 if (i == end ()) 228 if (i == end ())
220 { 229 {
221 net_rateinfo ri; 230 net_rateinfo ri;
222 231
223 ri.host = host; 232 ri.host = host;
224 ri.pcnt = 1.; 233 ri.pcnt = 1.;
225 ri.diff = CUTOFF * (1. / (1. - ALPHA)); 234 ri.diff = NRL_MAXDIF;
226 ri.last = NOW; 235 ri.last = NOW;
227 236
228 push_front (ri); 237 push_front (ri);
229 238
230 return true; 239 return true;
… …
232 else 241 else
233 { 242 {
234 net_rateinfo ri (*i); 243 net_rateinfo ri (*i);
235 erase (i); 244 erase (i);
236 245
237 ri.pcnt = ri.pcnt * ALPHA; 246 ri.pcnt = ri.pcnt * NRL_ALPHA;
238 ri.diff = ri.diff * ALPHA + (NOW - ri.last); 247 ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
239 248
240 ri.last = NOW; 249 ri.last = NOW;
241 250
251 double dif = ri.diff / ri.pcnt;
252
242 bool send = ri.diff / ri.pcnt > CUTOFF; 253 bool send = dif > NRL_CUTOFF;
243 254
255 if (dif > NRL_MAXDIF)
256 {
257 ri.pcnt = 1.;
258 ri.diff = NRL_MAXDIF;
259 }
244 if (send) 260 else if (send)
245 ri.pcnt++; 261 ri.pcnt++;
246 262
247 push_front (ri); 263 push_front (ri);
248 264
249 return send; 265 return send;
… …
280 hmac_gen (ctx); 296 hmac_gen (ctx);
281 297
282 return !memcmp (hmac, hmac_digest, HMACLENGTH); 298 return !memcmp (hmac, hmac_digest, HMACLENGTH);
283} 299}
284 300
285void vpn_packet::set_hdr (ptype type, unsigned int dst) 301void vpn_packet::set_hdr (ptype type_, unsigned int dst)
286{ 302{
287 this->type = type; 303 type = type_;
288 304
289 int src = THISNODE->id; 305 int src = THISNODE->id;
290 306
291 src1 = src; 307 src1 = src;
292 srcdst = ((src >> 8) << 4) | (dst >> 8); 308 srcdst = ((src >> 8) << 4) | (dst >> 8);
… …
294} 310}
295 311
296#define MAXVPNDATA (MAX_MTU - 6 - 6) 312#define MAXVPNDATA (MAX_MTU - 6 - 6)
297#define DATAHDR (sizeof (u32) + RAND_SIZE) 313#define DATAHDR (sizeof (u32) + RAND_SIZE)
298 314
299struct vpndata_packet:vpn_packet 315struct vpndata_packet : vpn_packet
300 { 316 {
301 u8 data[MAXVPNDATA + DATAHDR]; // seqno 317 u8 data[MAXVPNDATA + DATAHDR]; // seqno
302 318
303 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); 319 void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
304 tap_packet *unpack (connection *conn, u32 &seqno); 320 tap_packet *unpack (connection *conn, u32 &seqno);
… …
317 int outl = 0, outl2; 333 int outl = 0, outl2;
318 ptype type = PT_DATA_UNCOMPRESSED; 334 ptype type = PT_DATA_UNCOMPRESSED;
319 335
320#if ENABLE_COMPRESSION 336#if ENABLE_COMPRESSION
321 u8 cdata[MAX_MTU]; 337 u8 cdata[MAX_MTU];
322 u32 cl;
323 338
339 if (conn->features & ENABLE_COMPRESSION)
340 {
324 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); 341 u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
342
325 if (cl) 343 if (cl)
326 { 344 {
327 type = PT_DATA_COMPRESSED; 345 type = PT_DATA_COMPRESSED;
328 d = cdata; 346 d = cdata;
329 l = cl + 2; 347 l = cl + 2;
330 348
331 d[0] = cl >> 8; 349 d[0] = cl >> 8;
332 d[1] = cl; 350 d[1] = cl;
351 }
333 } 352 }
334#endif 353#endif
335 354
336 EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); 355 require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
337 356
338 struct { 357 struct {
339#if RAND_SIZE 358#if RAND_SIZE
340 u8 rnd[RAND_SIZE]; 359 u8 rnd[RAND_SIZE];
341#endif 360#endif
… …
345 datahdr.seqno = ntohl (seqno); 364 datahdr.seqno = ntohl (seqno);
346#if RAND_SIZE 365#if RAND_SIZE
347 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); 366 RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
348#endif 367#endif
349 368
350 EVP_EncryptUpdate (cctx, 369 require (EVP_EncryptUpdate (cctx,
351 (unsigned char *) data + outl, &outl2, 370 (unsigned char *) data + outl, &outl2,
352 (unsigned char *) &datahdr, DATAHDR); 371 (unsigned char *) &datahdr, DATAHDR));
353 outl += outl2; 372 outl += outl2;
354 373
355 EVP_EncryptUpdate (cctx, 374 require (EVP_EncryptUpdate (cctx,
356 (unsigned char *) data + outl, &outl2, 375 (unsigned char *) data + outl, &outl2,
357 (unsigned char *) d, l); 376 (unsigned char *) d, l));
358 outl += outl2; 377 outl += outl2;
359 378
360 EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); 379 require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
361 outl += outl2; 380 outl += outl2;
362 381
363 len = outl + data_hdr_size (); 382 len = outl + data_hdr_size ();
364 383
365 set_hdr (type, dst); 384 set_hdr (type, dst);
… …
374 int outl = 0, outl2; 393 int outl = 0, outl2;
375 tap_packet *p = new tap_packet; 394 tap_packet *p = new tap_packet;
376 u8 *d; 395 u8 *d;
377 u32 l = len - data_hdr_size (); 396 u32 l = len - data_hdr_size ();
378 397
379 EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); 398 require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
380 399
381#if ENABLE_COMPRESSION 400#if ENABLE_COMPRESSION
382 u8 cdata[MAX_MTU]; 401 u8 cdata[MAX_MTU];
383 402
384 if (type == PT_DATA_COMPRESSED) 403 if (type == PT_DATA_COMPRESSED)
… …
386 else 405 else
387#endif 406#endif
388 d = &(*p)[6 + 6 - DATAHDR]; 407 d = &(*p)[6 + 6 - DATAHDR];
389 408
390 /* this overwrites part of the src mac, but we fix that later */ 409 /* this overwrites part of the src mac, but we fix that later */
391 EVP_DecryptUpdate (cctx, 410 require (EVP_DecryptUpdate (cctx,
392 d, &outl2, 411 d, &outl2,
393 (unsigned char *)&data, len - data_hdr_size ()); 412 (unsigned char *)&data, len - data_hdr_size ()));
394 outl += outl2; 413 outl += outl2;
395 414
396 EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); 415 require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
397 outl += outl2; 416 outl += outl2;
398 417
399 seqno = ntohl (*(u32 *)(d + RAND_SIZE)); 418 seqno = ntohl (*(u32 *)(d + RAND_SIZE));
400 419
401 id2mac (dst () ? dst() : THISNODE->id, p->dst); 420 id2mac (dst () ? dst() : THISNODE->id, p->dst);
… …
430{ 449{
431 // actually, hmaclen cannot be checked because the hmac 450 // actually, hmaclen cannot be checked because the hmac
432 // field comes before this data, so peers with other 451 // field comes before this data, so peers with other
433 // hmacs simply will not work. 452 // hmacs simply will not work.
434 u8 prot_major, prot_minor, randsize, hmaclen; 453 u8 prot_major, prot_minor, randsize, hmaclen;
435 u8 flags, challengelen, pad2, pad3; 454 u8 flags, challengelen, features, pad3;
436 u32 cipher_nid, digest_nid, hmac_nid; 455 u32 cipher_nid, digest_nid, hmac_nid;
437
438 const u8 curflags () const
439 {
440 return 0x80
441 | (ENABLE_COMPRESSION ? 0x01 : 0x00);
442 }
443 456
444 void setup (ptype type, int dst); 457 void setup (ptype type, int dst);
445 bool chk_config () const; 458 bool chk_config () const;
459
460 static u8 get_features ()
461 {
462 u8 f = 0;
463#if ENABLE_COMPRESSION
464 f |= FEATURE_COMPRESSION;
465#endif
466#if ENABLE_ROHC
467 f |= FEATURE_ROHC;
468#endif
469 return f;
470 }
446}; 471};
447 472
448void config_packet::setup (ptype type, int dst) 473void config_packet::setup (ptype type, int dst)
449{ 474{
450 prot_major = PROTOCOL_MAJOR; 475 prot_major = PROTOCOL_MAJOR;
451 prot_minor = PROTOCOL_MINOR; 476 prot_minor = PROTOCOL_MINOR;
452 randsize = RAND_SIZE; 477 randsize = RAND_SIZE;
453 hmaclen = HMACLENGTH; 478 hmaclen = HMACLENGTH;
454 flags = curflags (); 479 flags = 0;
455 challengelen = sizeof (rsachallenge); 480 challengelen = sizeof (rsachallenge);
481 features = get_features ();
456 482
457 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 483 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
458 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 484 digest_nid = htonl (EVP_MD_type (RSA_HASH));
459 hmac_nid = htonl (EVP_MD_type (DIGEST)); 485 hmac_nid = htonl (EVP_MD_type (DIGEST));
460 486
… …
462 set_hdr (type, dst); 488 set_hdr (type, dst);
463} 489}
464 490
465bool config_packet::chk_config () const 491bool config_packet::chk_config () const
466{ 492{
467 return prot_major == PROTOCOL_MAJOR 493 if (prot_major != PROTOCOL_MAJOR)
468 && randsize == RAND_SIZE 494 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
469 && hmaclen == HMACLENGTH 495 else if (randsize != RAND_SIZE)
470 && flags == curflags () 496 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
497 else if (hmaclen != HMACLENGTH)
498 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
471 && challengelen == sizeof (rsachallenge) 499 else if (challengelen != sizeof (rsachallenge))
500 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
472 && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) 501 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
502 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
473 && digest_nid == htonl (EVP_MD_type (RSA_HASH)) 503 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
504 slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
474 && hmac_nid == htonl (EVP_MD_type (DIGEST)); 505 else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
506 slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
507 else
508 return true;
509
510 return false;
475} 511}
476 512
477struct auth_req_packet : config_packet 513struct auth_req_packet : config_packet
478{ 514{
479 char magic[8]; 515 char magic[8];
480 u8 initiate; // false if this is just an automatic reply 516 u8 initiate; // false if this is just an automatic reply
481 u8 protocols; // supported protocols (will get patches on forward) 517 u8 protocols; // supported protocols (will be patched on forward)
482 u8 pad2, pad3; 518 u8 pad2, pad3;
483 rsaid id; 519 rsaid id;
484 rsaencrdata encr; 520 rsaencrdata encr;
485 521
486 auth_req_packet (int dst, bool initiate_, u8 protocols_) 522 auth_req_packet (int dst, bool initiate_, u8 protocols_)
… …
541}; 577};
542 578
543///////////////////////////////////////////////////////////////////////////// 579/////////////////////////////////////////////////////////////////////////////
544 580
545void 581void
582connection::connection_established ()
583{
584 if (ictx && octx)
585 {
586 connectmode = conf->connectmode;
587
588 // make sure rekeying timeouts are slightly asymmetric
589 rekey.start (NOW + ::conf.rekey
590 + (conf->id > THISNODE->id ? 10 : 0));
591 keepalive.start (NOW + ::conf.keepalive);
592
593 // send queued packets
594 if (ictx && octx)
595 {
596 while (tap_packet *p = (tap_packet *)data_queue.get ())
597 {
598 send_data_packet (p);
599 delete p;
600 }
601
602 while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
603 {
604 send_vpn_packet (p, si, IPTOS_RELIABILITY);
605 delete p;
606 }
607 }
608 }
609 else
610 {
611 retry_cnt = 0;
612 establish_connection.start (NOW + 5);
613 keepalive.stop ();
614 rekey.stop ();
615 }
616}
617
618void
546connection::reset_dstaddr () 619connection::reset_si ()
547{ 620{
621 protocol = best_protocol (THISNODE->protocols & conf->protocols);
622
623 // mask out protocols we cannot establish
624 if (!conf->udp_port) protocol &= ~PROT_UDPv4;
625 if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
626 if (!conf->dns_port) protocol &= ~PROT_DNSv4;
627
548 si.set (conf); 628 si.set (conf, protocol);
629}
630
631// ensure sockinfo is valid, forward if necessary
632const sockinfo &
633connection::forward_si (const sockinfo &si) const
634{
635 if (!si.valid ())
636 {
637 connection *r = vpn->find_router ();
638
639 if (r)
640 {
641 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
642 conf->nodename, r->conf->nodename, (const char *)r->si);
643 return r->si;
644 }
645 else
646 slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
647 conf->nodename);
648 }
649
650 return si;
651}
652
653void
654connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
655{
656 if (!vpn->send_vpn_packet (pkt, si, tos))
657 reset_connection ();
549} 658}
550 659
551void 660void
552connection::send_ping (const sockinfo &si, u8 pong) 661connection::send_ping (const sockinfo &si, u8 pong)
553{ 662{
… …
576void 685void
577connection::send_auth_request (const sockinfo &si, bool initiate) 686connection::send_auth_request (const sockinfo &si, bool initiate)
578{ 687{
579 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); 688 auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580 689
581 protocol = best_protocol (THISNODE->protocols & conf->protocols);
582
583 rsachallenge chg; 690 rsachallenge chg;
584
585 rsa_cache.gen (pkt->id, chg); 691 rsa_cache.gen (pkt->id, chg);
586 692 rsa_encrypt (conf->rsa_key, chg, pkt->encr);
587 if (0 > RSA_public_encrypt (sizeof chg,
588 (unsigned char *)&chg, (unsigned char *)&pkt->encr,
589 conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590 fatal ("RSA_public_encrypt error");
591 693
592 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); 694 slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
593 695
696 send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
697
698 delete pkt;
699}
700
701void
702connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
703{
704 auth_res_packet *pkt = new auth_res_packet (conf->id);
705
706 pkt->id = id;
707
708 rsa_hash (id, chg, pkt->response);
709
710 pkt->hmac_set (octx);
711
712 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
713
594 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly 714 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
595 715
596 delete pkt; 716 delete pkt;
597} 717}
598 718
599void 719void
600connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
601{
602 auth_res_packet *pkt = new auth_res_packet (conf->id);
603
604 pkt->id = id;
605
606 rsa_hash (id, chg, pkt->response);
607
608 pkt->hmac_set (octx);
609
610 slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
611
612 send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
613
614 delete pkt;
615}
616
617void
618connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) 720connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
619{ 721{
620 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", 722 slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",
621 conf->id, rid, (const char *)rsi); 723 conf->id, rid, (const char *)rsi);
622 724
623 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); 725 connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
624 726
625 r->hmac_set (octx); 727 r->hmac_set (octx);
… …
627 729
628 delete r; 730 delete r;
629} 731}
630 732
631void 733void
632connection::establish_connection_cb (tstamp &ts) 734connection::establish_connection_cb (time_watcher &w)
633{ 735{
634 if (ictx || conf == THISNODE 736 if (!ictx
737 && conf != THISNODE
635 || connectmode == conf_node::C_NEVER 738 && connectmode != conf_node::C_NEVER
636 || connectmode == conf_node::C_DISABLED) 739 && connectmode != conf_node::C_DISABLED
637 ts = TSTAMP_CANCEL; 740 && NOW > w.at)
638 else if (ts <= NOW)
639 { 741 {
640 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 742 w.at = TSTAMP_MAX; // first disable this watcher in case of recursion
641 743
642 if (retry_int < 3600 * 8) 744 double retry_int = double (retry_cnt & 3
745 ? (retry_cnt & 3) + 1
746 : 1 << (retry_cnt >> 2));
747
748 reset_si ();
749
750 bool slow = si.prot & PROT_SLOW;
751
752 if (si.prot && !si.host)
753 vpn->send_connect_request (conf->id);
754 else
755 {
756 const sockinfo &dsi = forward_si (si);
757
758 slow = slow || (dsi.prot & PROT_SLOW);
759
760 if (dsi.valid () && auth_rate_limiter.can (dsi))
761 {
762 if (retry_cnt < 4)
763 send_auth_request (dsi, true);
764 else
765 send_ping (dsi, 0);
766 }
767 }
768
769 retry_int *= slow ? 8. : 0.7;
770
771 if (retry_int < conf->max_retry)
643 retry_cnt++; 772 retry_cnt++;
644
645 ts = NOW + retry_int;
646
647 if (conf->hostname)
648 {
649 reset_dstaddr ();
650 if (si.host && auth_rate_limiter.can (si))
651 {
652 if (retry_cnt < 4)
653 send_auth_request (si, true);
654 else
655 send_ping (si, 0);
656 }
657 }
658 else 773 else
659 vpn->connect_request (conf->id); 774 retry_int = conf->max_retry;
775
776 w.start (NOW + retry_int);
660 } 777 }
661} 778}
662 779
663void 780void
664connection::reset_connection () 781connection::reset_connection ()
… …
667 { 784 {
668 slog (L_INFO, _("%s(%s): connection lost"), 785 slog (L_INFO, _("%s(%s): connection lost"),
669 conf->nodename, (const char *)si); 786 conf->nodename, (const char *)si);
670 787
671 if (::conf.script_node_down) 788 if (::conf.script_node_down)
672 run_script (run_script_cb (this, &connection::script_node_down), false); 789 if (!run_script (run_script_cb (this, &connection::script_node_down), false))
790 slog (L_WARN, _("node-down command execution failed, continuing."));
673 } 791 }
674 792
675 delete ictx; ictx = 0; 793 delete ictx; ictx = 0;
676 delete octx; octx = 0; 794 delete octx; octx = 0;
795#if ENABLE_DNS
796 dnsv4_reset_connection ();
797#endif
677 798
678 si.host= 0; 799 si.host = 0;
679 800
680 last_activity = 0; 801 last_activity = 0;
681 retry_cnt = 0; 802 retry_cnt = 0;
682 803
683 rekey.reset (); 804 rekey.stop ();
684 keepalive.reset (); 805 keepalive.stop ();
685 establish_connection.reset (); 806 establish_connection.stop ();
686} 807}
687 808
688void 809void
689connection::shutdown () 810connection::shutdown ()
690{ 811{
… …
693 814
694 reset_connection (); 815 reset_connection ();
695} 816}
696 817
697void 818void
698connection::rekey_cb (tstamp &ts) 819connection::rekey_cb (time_watcher &w)
699{ 820{
700 ts = TSTAMP_CANCEL;
701
702 reset_connection (); 821 reset_connection ();
703 establish_connection (); 822 establish_connection ();
704} 823}
705 824
706void 825void
707connection::send_data_packet (tap_packet *pkt, bool broadcast) 826connection::send_data_packet (tap_packet *pkt)
708{ 827{
709 vpndata_packet *p = new vpndata_packet; 828 vpndata_packet *p = new vpndata_packet;
710 int tos = 0; 829 int tos = 0;
711 830
712 if (conf->inherit_tos 831 // I am not hilarious about peeking into packets, but so be it.
713 && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP 832 if (conf->inherit_tos && pkt->is_ipv4 ())
714 && ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715 tos = (*pkt)[15] & IPTOS_TOS_MASK; 833 tos = (*pkt)[15] & IPTOS_TOS_MASK;
716 834
717 p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs 835 p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
718 send_vpn_packet (p, si, tos); 836 send_vpn_packet (p, si, tos);
719 837
720 delete p; 838 delete p;
721 839
722 if (oseqno > MAX_SEQNO) 840 if (oseqno > MAX_SEQNO)
723 rekey (); 841 rekey ();
724} 842}
725 843
726void 844void
727connection::inject_data_packet (tap_packet *pkt, bool broadcast) 845connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)
728{ 846{
729 if (ictx && octx) 847 if (ictx && octx)
730 send_data_packet (pkt, broadcast); 848 send_data_packet (pkt);
731 else 849 else
732 { 850 {
733 if (!broadcast)//DDDD 851 if (!broadcast)
734 queue.put (new tap_packet (*pkt)); 852 data_queue.put (new tap_packet (*pkt));
853
854 establish_connection ();
855 }
856}
857
858void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
859{
860 if (ictx && octx)
861 send_vpn_packet (pkt, si, tos);
862 else
863 {
864 vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
735 865
736 establish_connection (); 866 establish_connection ();
737 } 867 }
738} 868}
739 869
… …
745 slog (L_NOISE, "<<%d received packet type %d from %d to %d", 875 slog (L_NOISE, "<<%d received packet type %d from %d to %d",
746 conf->id, pkt->typ (), pkt->src (), pkt->dst ()); 876 conf->id, pkt->typ (), pkt->src (), pkt->dst ());
747 877
748 switch (pkt->typ ()) 878 switch (pkt->typ ())
749 { 879 {
750 case vpn_packet::PT_PING: 880 case vpn_packet::PT_PING:
751 // we send pings instead of auth packets after some retries, 881 // we send pings instead of auth packets after some retries,
752 // so reset the retry counter and establish a connection 882 // so reset the retry counter and establish a connection
753 // when we receive a ping. 883 // when we receive a ping.
754 if (!ictx) 884 if (!ictx)
885 {
886 if (auth_rate_limiter.can (rsi))
887 send_auth_request (rsi, true);
888 }
889 else
890 send_ping (rsi, 1); // pong
891
892 break;
893
894 case vpn_packet::PT_PONG:
895 break;
896
897 case vpn_packet::PT_RESET:
755 { 898 {
756 if (auth_rate_limiter.can (rsi)) 899 reset_connection ();
757 send_auth_request (rsi, true); 900
901 config_packet *p = (config_packet *) pkt;
902
903 if (!p->chk_config ())
904 {
905 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
906 conf->nodename, (const char *)rsi);
907 connectmode = conf_node::C_DISABLED;
908 }
909 else if (connectmode == conf_node::C_ALWAYS)
910 establish_connection ();
758 } 911 }
759 else
760 send_ping (rsi, 1); // pong
761
762 break; 912 break;
763 913
764 case vpn_packet::PT_PONG:
765 break;
766
767 case vpn_packet::PT_RESET: 914 case vpn_packet::PT_AUTH_REQ:
768 { 915 if (auth_rate_limiter.can (rsi))
769 reset_connection ();
770
771 config_packet *p = (config_packet *) pkt;
772
773 if (!p->chk_config ())
774 { 916 {
917 auth_req_packet *p = (auth_req_packet *) pkt;
918
919 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
920
921 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
922 {
923 if (p->prot_minor != PROTOCOL_MINOR)
924 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
925 conf->nodename, (const char *)rsi,
926 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
927
928 if (p->initiate)
929 send_auth_request (rsi, false);
930
931 rsachallenge k;
932
933 if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
934 {
935 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
936 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
937 break;
938 }
939 else
940 {
941 delete octx;
942
943 octx = new crypto_ctx (k, 1);
944 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
945
946 conf->protocols = p->protocols;
947 features = p->features & config_packet::get_features ();
948
949 send_auth_response (rsi, p->id, k);
950
951 connection_established ();
952
953 break;
954 }
955 }
956 else
775 slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), 957 slog (L_WARN, _("%s(%s): protocol mismatch"),
776 conf->nodename, (const char *)rsi); 958 conf->nodename, (const char *)rsi);
777 connectmode = conf_node::C_DISABLED; 959
960 send_reset (rsi);
778 } 961 }
779 else if (connectmode == conf_node::C_ALWAYS) 962
780 establish_connection ();
781 }
782 break; 963 break;
783 964
784 case vpn_packet::PT_AUTH_REQ: 965 case vpn_packet::PT_AUTH_RES:
785 if (auth_rate_limiter.can (rsi))
786 { 966 {
787 auth_req_packet *p = (auth_req_packet *) pkt; 967 auth_res_packet *p = (auth_res_packet *) pkt;
788 968
789 slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); 969 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
790 970
791 if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) 971 if (p->chk_config ())
792 { 972 {
793 if (p->prot_minor != PROTOCOL_MINOR) 973 if (p->prot_minor != PROTOCOL_MINOR)
794 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), 974 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
795 conf->nodename, (const char *)rsi, 975 conf->nodename, (const char *)rsi,
796 PROTOCOL_MINOR, conf->nodename, p->prot_minor); 976 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797 977
798 if (p->initiate)
799 send_auth_request (rsi, false);
800
801 rsachallenge k; 978 rsachallenge chg;
802 979
803 if (0 > RSA_private_decrypt (sizeof (p->encr), 980 if (!rsa_cache.find (p->id, chg))
804 (unsigned char *)&p->encr, (unsigned char *)&k, 981 {
805 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) 982 slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
806 slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807 conf->nodename, (const char *)rsi); 983 conf->nodename, (const char *)rsi);
984 break;
985 }
808 else 986 else
809 { 987 {
810 retry_cnt = 0; 988 crypto_ctx *cctx = new crypto_ctx (chg, 0);
811 establish_connection.set (NOW + 8); //? ;) 989
812 keepalive.reset (); 990 if (!p->hmac_chk (cctx))
991 {
992 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
993 "could be an attack, or just corruption or a synchronization error"),
994 conf->nodename, (const char *)rsi);
995 break;
996 }
813 rekey.reset (); 997 else
998 {
999 rsaresponse h;
814 1000
1001 rsa_hash (p->id, chg, h);
1002
1003 if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1004 {
1005 prot_minor = p->prot_minor;
1006
1007 delete ictx; ictx = cctx;
1008
1009 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1010
1011 si = rsi;
1012 protocol = rsi.prot;
1013
1014 connection_established ();
1015
1016 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1017 conf->nodename, (const char *)rsi,
1018 p->prot_major, p->prot_minor);
1019
1020 if (::conf.script_node_up)
1021 if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1022 slog (L_WARN, _("node-up command execution failed, continuing."));
1023
1024 break;
1025 }
1026 else
1027 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1028 conf->nodename, (const char *)rsi);
1029 }
1030
815 delete ictx; 1031 delete cctx;
816 ictx = 0;
817
818 delete octx;
819
820 octx = new crypto_ctx (k, 1);
821 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
822
823 conf->protocols = p->protocols;
824 send_auth_response (rsi, p->id, k);
825
826 break;
827 } 1032 }
828 } 1033 }
829
830 send_reset (rsi);
831 } 1034 }
832 1035
1036 send_reset (rsi);
833 break; 1037 break;
834 1038
835 case vpn_packet::PT_AUTH_RES: 1039 case vpn_packet::PT_DATA_COMPRESSED:
836 { 1040#if !ENABLE_COMPRESSION
837 auth_res_packet *p = (auth_res_packet *) pkt; 1041 send_reset (rsi);
1042 break;
1043#endif
838 1044
839 slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); 1045 case vpn_packet::PT_DATA_UNCOMPRESSED:
840 1046
841 if (p->chk_config ()) 1047 if (ictx && octx)
842 { 1048 {
843 if (p->prot_minor != PROTOCOL_MINOR) 1049 vpndata_packet *p = (vpndata_packet *)pkt;
844 slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
845 conf->nodename, (const char *)rsi,
846 PROTOCOL_MINOR, conf->nodename, p->prot_minor);
847 1050
848 rsachallenge chg; 1051 if (!p->hmac_chk (ictx))
849 1052 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850 if (!rsa_cache.find (p->id, chg)) 1053 "could be an attack, or just corruption or a synchronization error"),
851 slog (L_ERR, _("%s(%s): unrequested auth response"),
852 conf->nodename, (const char *)rsi); 1054 conf->nodename, (const char *)rsi);
853 else 1055 else
854 { 1056 {
855 crypto_ctx *cctx = new crypto_ctx (chg, 0);
856
857 if (!p->hmac_chk (cctx))
858 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
859 "could be an attack, or just corruption or an synchronization error"),
860 conf->nodename, (const char *)rsi);
861 else 1057 u32 seqno;
1058 tap_packet *d = p->unpack (this, seqno);
1059
1060 if (iseqno.recv_ok (seqno))
862 { 1061 {
863 rsaresponse h; 1062 vpn->tap->send (d);
864 1063
865 rsa_hash (p->id, chg, h); 1064 if (si != rsi)
866
867 if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
868 { 1065 {
869 prot_minor = p->prot_minor; 1066 // fast re-sync on source address changes, useful especially for tcp/ip
870
871 delete ictx; ictx = cctx;
872
873 iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
874
875 si = rsi; 1067 si = rsi;
876 1068
877 rekey.set (NOW + ::conf.rekey); 1069 slog (L_INFO, _("%s(%s): socket address changed to %s"),
878 keepalive.set (NOW + ::conf.keepalive);
879
880 // send queued packets
881 while (tap_packet *p = queue.get ())
882 {
883 send_data_packet (p);
884 delete p;
885 }
886
887 connectmode = conf->connectmode;
888
889 slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
890 conf->nodename, (const char *)rsi, 1070 conf->nodename, (const char *)si, (const char *)rsi);
891 strprotocol (protocol),
892 p->prot_major, p->prot_minor);
893
894 if (::conf.script_node_up)
895 run_script (run_script_cb (this, &connection::script_node_up), false);
896
897 break;
898 } 1071 }
899 else
900 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
901 conf->nodename, (const char *)rsi);
902 } 1072 }
903 1073
904 delete cctx; 1074 delete d;
1075 break;
905 } 1076 }
906 } 1077 }
907 }
908 1078
909 send_reset (rsi); 1079 send_reset (rsi);
910 break; 1080 break;
911 1081
912 case vpn_packet::PT_DATA_COMPRESSED:
913#if !ENABLE_COMPRESSION
914 send_reset (rsi);
915 break;
916#endif
917
918 case vpn_packet::PT_DATA_UNCOMPRESSED:
919
920 if (ictx && octx)
921 {
922 vpndata_packet *p = (vpndata_packet *)pkt;
923
924 if (rsi == si)
925 {
926 if (!p->hmac_chk (ictx))
927 slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
928 "could be an attack, or just corruption or an synchronization error"),
929 conf->nodename, (const char *)rsi);
930 else
931 {
932 u32 seqno;
933 tap_packet *d = p->unpack (this, seqno);
934
935 if (iseqno.recv_ok (seqno))
936 {
937 vpn->tap->send (d);
938
939 if (p->dst () == 0) // re-broadcast
940 for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
941 {
942 connection *c = *i;
943
944 if (c->conf != THISNODE && c->conf != conf)
945 c->inject_data_packet (d);
946 }
947
948 delete d;
949
950 break;
951 }
952 }
953 }
954 else
955 slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
956 }
957
958 send_reset (rsi);
959 break;
960
961 case vpn_packet::PT_CONNECT_REQ: 1082 case vpn_packet::PT_CONNECT_REQ:
962 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1083 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963 { 1084 {
964 connect_req_packet *p = (connect_req_packet *) pkt; 1085 connect_req_packet *p = (connect_req_packet *) pkt;
965 1086
966 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1087 if (p->id > 0 && p->id <= vpn->conns.size ())
967 conf->protocols = p->protocols; 1088 {
968 connection *c = vpn->conns[p->id - 1]; 1089 connection *c = vpn->conns[p->id - 1];
1090 conf->protocols = p->protocols;
969 1091
970 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", 1092 slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",
971 conf->id, p->id, c->ictx && c->octx); 1093 conf->id, p->id, c->ictx && c->octx);
972 1094
973 if (c->ictx && c->octx) 1095 if (c->ictx && c->octx)
974 { 1096 {
975 // send connect_info packets to both sides, in case one is 1097 // send connect_info packets to both sides, in case one is
976 // behind a nat firewall (or both ;) 1098 // behind a nat firewall (or both ;)
977 c->send_connect_info (conf->id, si, conf->protocols); 1099 c->send_connect_info (conf->id, si, conf->protocols);
978 send_connect_info (c->conf->id, c->si, c->conf->protocols); 1100 send_connect_info (c->conf->id, c->si, c->conf->protocols);
1101 }
1102 else
1103 c->establish_connection ();
979 } 1104 }
1105 else
1106 slog (L_WARN,
1107 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1108 p->id);
980 } 1109 }
981 1110
982 break; 1111 break;
983 1112
984 case vpn_packet::PT_CONNECT_INFO: 1113 case vpn_packet::PT_CONNECT_INFO:
985 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) 1114 if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986 { 1115 {
987 connect_info_packet *p = (connect_info_packet *) pkt; 1116 connect_info_packet *p = (connect_info_packet *)pkt;
988 1117
989 assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything 1118 if (p->id > 0 && p->id <= vpn->conns.size ())
990 conf->protocols = p->protocols; 1119 {
991 connection *c = vpn->conns[p->id - 1]; 1120 connection *c = vpn->conns[p->id - 1];
992 1121
1122 c->conf->protocols = p->protocols;
1123 protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1124 p->si.upgrade_protocol (protocol, c->conf);
1125
993 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", 1126 slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
994 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); 1127 conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
995 1128
1129 const sockinfo &dsi = forward_si (p->si);
1130
1131 if (dsi.valid ())
996 c->send_auth_request (p->si, true); 1132 c->send_auth_request (dsi, true);
1133 }
1134 else
1135 slog (L_WARN,
1136 _("received authenticated connection request from unknown node #%d, config file mismatch?"),
1137 p->id);
997 } 1138 }
998 1139
999 break; 1140 break;
1000 1141
1001 default: 1142 default:
1002 send_reset (rsi); 1143 send_reset (rsi);
1003 break; 1144 break;
1004
1005 } 1145 }
1006} 1146}
1007 1147
1008void connection::keepalive_cb (tstamp &ts) 1148void connection::keepalive_cb (time_watcher &w)
1009{ 1149{
1010 if (NOW >= last_activity + ::conf.keepalive + 30) 1150 if (NOW >= last_activity + ::conf.keepalive + 30)
1011 { 1151 {
1012 reset_connection (); 1152 reset_connection ();
1013 establish_connection (); 1153 establish_connection ();
1014 } 1154 }
1015 else if (NOW < last_activity + ::conf.keepalive) 1155 else if (NOW < last_activity + ::conf.keepalive)
1016 ts = last_activity + ::conf.keepalive; 1156 w.start (last_activity + ::conf.keepalive);
1017 else if (conf->connectmode != conf_node::C_ONDEMAND 1157 else if (conf->connectmode != conf_node::C_ONDEMAND
1018 || THISNODE->connectmode != conf_node::C_ONDEMAND) 1158 || THISNODE->connectmode != conf_node::C_ONDEMAND)
1019 { 1159 {
1020 send_ping (si); 1160 send_ping (si);
1021 ts = NOW + 5; 1161 w.start (NOW + 5);
1022 } 1162 }
1163 else if (NOW < last_activity + ::conf.keepalive + 10)
1164 // hold ondemand connections implicitly a few seconds longer
1165 // should delete octx, though, or something like that ;)
1166 w.start (last_activity + ::conf.keepalive + 10);
1023 else 1167 else
1024 reset_connection (); 1168 reset_connection ();
1025} 1169}
1026 1170
1027void connection::connect_request (int id) 1171void connection::send_connect_request (int id)
1028{ 1172{
1029 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); 1173 connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1030 1174
1031 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); 1175 slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1032 p->hmac_set (octx); 1176 p->hmac_set (octx);
1033 send_vpn_packet (p, si); 1177 send_vpn_packet (p, si);
1034 1178
1035 delete p; 1179 delete p;
1036} 1180}
1037 1181
1182void connection::script_init_env (const char *ext)
1183{
1184 char *env;
1185 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1186 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1187 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1188 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1189 conf->id & 0xff); putenv (env);
1190}
1191
1038void connection::script_node () 1192void connection::script_init_connect_env ()
1039{ 1193{
1040 vpn->script_if_up (0); 1194 vpn->script_init_env ();
1041 1195
1042 char *env; 1196 char *env;
1043 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1197 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1044 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1198 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1199 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1200 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047} 1201}
1048 1202
1049const char *connection::script_node_up (int) 1203const char *connection::script_node_up ()
1050{ 1204{
1051 script_node (); 1205 script_init_connect_env ();
1052 1206
1053 putenv ("STATE=up"); 1207 putenv ("STATE=up");
1054 1208
1209 char *filename;
1210 asprintf (&filename,
1211 "%s/%s",
1212 confbase,
1055 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1213 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1056}
1057 1214
1215 return filename;
1216}
1217
1058const char *connection::script_node_down (int) 1218const char *connection::script_node_down ()
1059{ 1219{
1060 script_node (); 1220 script_init_connect_env ();
1061 1221
1062 putenv ("STATE=down"); 1222 putenv ("STATE=down");
1063 1223
1064 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1224 char *filename;
1065} 1225 asprintf (&filename,
1226 "%s/%s",
1227 confbase,
1228 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1066 1229
1067// send a vpn packet out to other hosts 1230 return filename;
1068void
1069connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1070{
1071 if (protocol & PROT_IPv4)
1072 vpn->send_ipv4_packet (pkt, si, tos);
1073 else
1074 vpn->send_udpv4_packet (pkt, si, tos);
1075} 1231}
1076 1232
1077connection::connection(struct vpn *vpn_) 1233connection::connection (struct vpn *vpn, conf_node *conf)
1078: vpn(vpn_) 1234: vpn(vpn), conf(conf)
1079, rekey (this, &connection::rekey_cb) 1235, rekey (this, &connection::rekey_cb)
1080, keepalive (this, &connection::keepalive_cb) 1236, keepalive (this, &connection::keepalive_cb)
1081, establish_connection (this, &connection::establish_connection_cb) 1237, establish_connection (this, &connection::establish_connection_cb)
1238#if ENABLE_DNS
1239, dns (0)
1240#endif
1082{ 1241{
1083 octx = ictx = 0; 1242 octx = ictx = 0;
1084 retry_cnt = 0; 1243 retry_cnt = 0;
1085 1244
1245 if (!conf->protocols) // make sure some protocol is enabled
1246 conf->protocols = PROT_UDPv4;
1247
1086 connectmode = conf_node::C_ALWAYS; // initial setting 1248 connectmode = conf_node::C_ALWAYS; // initial setting
1087 reset_connection (); 1249 reset_connection ();
1088} 1250}
1089 1251
1090connection::~connection () 1252connection::~connection ()

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