1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
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|
5 | This file is part of GVPE. |
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6 | |
5 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
10 | (at your option) any later version. |
9 | |
11 | |
10 | 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, |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
13 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
14 | |
16 | |
15 | 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 |
16 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
20 | */ |
19 | |
21 | |
20 | #include "config.h" |
22 | #include "config.h" |
21 | |
|
|
22 | extern "C" { |
|
|
23 | # include "lzf/lzf.h" |
|
|
24 | } |
|
|
25 | |
23 | |
26 | #include <cassert> |
24 | #include <cassert> |
27 | |
25 | |
28 | #include <list> |
26 | #include <list> |
29 | |
27 | |
… | |
… | |
46 | # define RAND_pseudo_bytes RAND_bytes |
44 | # define RAND_pseudo_bytes RAND_bytes |
47 | #endif |
45 | #endif |
48 | |
46 | |
49 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
47 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
50 | |
48 | |
|
|
49 | #define ULTRA_FAST 1 |
|
|
50 | #define HLOG 15 |
|
|
51 | #include "lzf/lzf.h" |
|
|
52 | #include "lzf/lzf_c.c" |
|
|
53 | #include "lzf/lzf_d.c" |
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|
54 | |
51 | struct crypto_ctx |
55 | struct crypto_ctx |
52 | { |
56 | { |
53 | EVP_CIPHER_CTX cctx; |
57 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
58 | HMAC_CTX hctx; |
55 | |
59 | |
… | |
… | |
58 | }; |
62 | }; |
59 | |
63 | |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
64 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
61 | { |
65 | { |
62 | EVP_CIPHER_CTX_init (&cctx); |
66 | EVP_CIPHER_CTX_init (&cctx); |
63 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
67 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
64 | HMAC_CTX_init (&hctx); |
68 | HMAC_CTX_init (&hctx); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
69 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
66 | } |
70 | } |
67 | |
71 | |
68 | crypto_ctx::~crypto_ctx () |
72 | crypto_ctx::~crypto_ctx () |
69 | { |
73 | { |
70 | EVP_CIPHER_CTX_cleanup (&cctx); |
74 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
71 | HMAC_CTX_cleanup (&hctx); |
75 | HMAC_CTX_cleanup (&hctx); |
72 | } |
76 | } |
73 | |
77 | |
74 | static void |
78 | static void |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
79 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
76 | { |
80 | { |
77 | EVP_MD_CTX ctx; |
81 | EVP_MD_CTX ctx; |
78 | |
82 | |
79 | EVP_MD_CTX_init (&ctx); |
83 | EVP_MD_CTX_init (&ctx); |
80 | EVP_DigestInit (&ctx, RSA_HASH); |
84 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
81 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
85 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
82 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
86 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
83 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
87 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
84 | EVP_MD_CTX_cleanup (&ctx); |
88 | EVP_MD_CTX_cleanup (&ctx); |
85 | } |
89 | } |
86 | |
90 | |
87 | struct rsa_entry { |
91 | struct rsa_entry { |
88 | tstamp expire; |
92 | tstamp expire; |
… | |
… | |
200 | // 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. |
201 | // this implementation ("splay list" ;) is inefficient, |
205 | // this implementation ("splay list" ;) is inefficient, |
202 | // but low on resources. |
206 | // but low on resources. |
203 | struct net_rate_limiter : list<net_rateinfo> |
207 | struct net_rate_limiter : list<net_rateinfo> |
204 | { |
208 | { |
205 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
209 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
206 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
210 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
207 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
211 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
208 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
212 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
209 | |
213 | |
210 | bool can (const sockinfo &si) { return can((u32)si.host); } |
214 | bool can (const sockinfo &si) { return can((u32)si.host); } |
211 | bool can (u32 host); |
215 | bool can (u32 host); |
212 | }; |
216 | }; |
213 | |
217 | |
… | |
… | |
218 | iterator i; |
222 | iterator i; |
219 | |
223 | |
220 | for (i = begin (); i != end (); ) |
224 | for (i = begin (); i != end (); ) |
221 | if (i->host == host) |
225 | if (i->host == host) |
222 | break; |
226 | break; |
223 | else if (i->last < NOW - EXPIRE) |
227 | else if (i->last < NOW - NRL_EXPIRE) |
224 | i = erase (i); |
228 | i = erase (i); |
225 | else |
229 | else |
226 | i++; |
230 | i++; |
227 | |
231 | |
228 | if (i == end ()) |
232 | if (i == end ()) |
229 | { |
233 | { |
230 | net_rateinfo ri; |
234 | net_rateinfo ri; |
231 | |
235 | |
232 | ri.host = host; |
236 | ri.host = host; |
233 | ri.pcnt = 1.; |
237 | ri.pcnt = 1.; |
234 | ri.diff = MAXDIF; |
238 | ri.diff = NRL_MAXDIF; |
235 | ri.last = NOW; |
239 | ri.last = NOW; |
236 | |
240 | |
237 | push_front (ri); |
241 | push_front (ri); |
238 | |
242 | |
239 | return true; |
243 | return true; |
… | |
… | |
241 | else |
245 | else |
242 | { |
246 | { |
243 | net_rateinfo ri (*i); |
247 | net_rateinfo ri (*i); |
244 | erase (i); |
248 | erase (i); |
245 | |
249 | |
246 | ri.pcnt = ri.pcnt * ALPHA; |
250 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
247 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
251 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
248 | |
252 | |
249 | ri.last = NOW; |
253 | ri.last = NOW; |
250 | |
254 | |
251 | double dif = ri.diff / ri.pcnt; |
255 | double dif = ri.diff / ri.pcnt; |
252 | |
256 | |
253 | bool send = dif > CUTOFF; |
257 | bool send = dif > NRL_CUTOFF; |
254 | |
258 | |
255 | if (dif > MAXDIF) |
259 | if (dif > NRL_MAXDIF) |
256 | { |
260 | { |
257 | ri.pcnt = 1.; |
261 | ri.pcnt = 1.; |
258 | ri.diff = MAXDIF; |
262 | ri.diff = NRL_MAXDIF; |
259 | } |
263 | } |
260 | else if (send) |
264 | else if (send) |
261 | ri.pcnt++; |
265 | ri.pcnt++; |
262 | |
266 | |
263 | push_front (ri); |
267 | push_front (ri); |
… | |
… | |
310 | } |
314 | } |
311 | |
315 | |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
316 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
317 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
314 | |
318 | |
315 | struct vpndata_packet:vpn_packet |
319 | struct vpndata_packet : vpn_packet |
316 | { |
320 | { |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
321 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
318 | |
322 | |
319 | 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); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
324 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
333 | int outl = 0, outl2; |
337 | int outl = 0, outl2; |
334 | ptype type = PT_DATA_UNCOMPRESSED; |
338 | ptype type = PT_DATA_UNCOMPRESSED; |
335 | |
339 | |
336 | #if ENABLE_COMPRESSION |
340 | #if ENABLE_COMPRESSION |
337 | u8 cdata[MAX_MTU]; |
341 | u8 cdata[MAX_MTU]; |
338 | u32 cl; |
|
|
339 | |
342 | |
|
|
343 | if (conn->features & ENABLE_COMPRESSION) |
|
|
344 | { |
340 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
345 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
346 | |
341 | if (cl) |
347 | if (cl) |
342 | { |
348 | { |
343 | type = PT_DATA_COMPRESSED; |
349 | type = PT_DATA_COMPRESSED; |
344 | d = cdata; |
350 | d = cdata; |
345 | l = cl + 2; |
351 | l = cl + 2; |
346 | |
352 | |
347 | d[0] = cl >> 8; |
353 | d[0] = cl >> 8; |
348 | d[1] = cl; |
354 | d[1] = cl; |
|
|
355 | } |
349 | } |
356 | } |
350 | #endif |
357 | #endif |
351 | |
358 | |
352 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
359 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
353 | |
360 | |
354 | struct { |
361 | struct { |
355 | #if RAND_SIZE |
362 | #if RAND_SIZE |
356 | u8 rnd[RAND_SIZE]; |
363 | u8 rnd[RAND_SIZE]; |
357 | #endif |
364 | #endif |
… | |
… | |
361 | datahdr.seqno = ntohl (seqno); |
368 | datahdr.seqno = ntohl (seqno); |
362 | #if RAND_SIZE |
369 | #if RAND_SIZE |
363 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
370 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
364 | #endif |
371 | #endif |
365 | |
372 | |
366 | EVP_EncryptUpdate (cctx, |
373 | require (EVP_EncryptUpdate (cctx, |
367 | (unsigned char *) data + outl, &outl2, |
374 | (unsigned char *) data + outl, &outl2, |
368 | (unsigned char *) &datahdr, DATAHDR); |
375 | (unsigned char *) &datahdr, DATAHDR)); |
369 | outl += outl2; |
376 | outl += outl2; |
370 | |
377 | |
371 | EVP_EncryptUpdate (cctx, |
378 | require (EVP_EncryptUpdate (cctx, |
372 | (unsigned char *) data + outl, &outl2, |
379 | (unsigned char *) data + outl, &outl2, |
373 | (unsigned char *) d, l); |
380 | (unsigned char *) d, l)); |
374 | outl += outl2; |
381 | outl += outl2; |
375 | |
382 | |
376 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
383 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
377 | outl += outl2; |
384 | outl += outl2; |
378 | |
385 | |
379 | len = outl + data_hdr_size (); |
386 | len = outl + data_hdr_size (); |
380 | |
387 | |
381 | set_hdr (type, dst); |
388 | set_hdr (type, dst); |
… | |
… | |
390 | int outl = 0, outl2; |
397 | int outl = 0, outl2; |
391 | tap_packet *p = new tap_packet; |
398 | tap_packet *p = new tap_packet; |
392 | u8 *d; |
399 | u8 *d; |
393 | u32 l = len - data_hdr_size (); |
400 | u32 l = len - data_hdr_size (); |
394 | |
401 | |
395 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
402 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
396 | |
403 | |
397 | #if ENABLE_COMPRESSION |
404 | #if ENABLE_COMPRESSION |
398 | u8 cdata[MAX_MTU]; |
405 | u8 cdata[MAX_MTU]; |
399 | |
406 | |
400 | if (type == PT_DATA_COMPRESSED) |
407 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
402 | else |
409 | else |
403 | #endif |
410 | #endif |
404 | d = &(*p)[6 + 6 - DATAHDR]; |
411 | d = &(*p)[6 + 6 - DATAHDR]; |
405 | |
412 | |
406 | /* 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 */ |
407 | EVP_DecryptUpdate (cctx, |
414 | require (EVP_DecryptUpdate (cctx, |
408 | d, &outl2, |
415 | d, &outl2, |
409 | (unsigned char *)&data, len - data_hdr_size ()); |
416 | (unsigned char *)&data, len - data_hdr_size ())); |
410 | outl += outl2; |
417 | outl += outl2; |
411 | |
418 | |
412 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
419 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
413 | outl += outl2; |
420 | outl += outl2; |
414 | |
421 | |
415 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
422 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
416 | |
423 | |
417 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
424 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
446 | { |
453 | { |
447 | // actually, hmaclen cannot be checked because the hmac |
454 | // actually, hmaclen cannot be checked because the hmac |
448 | // field comes before this data, so peers with other |
455 | // field comes before this data, so peers with other |
449 | // hmacs simply will not work. |
456 | // hmacs simply will not work. |
450 | u8 prot_major, prot_minor, randsize, hmaclen; |
457 | u8 prot_major, prot_minor, randsize, hmaclen; |
451 | u8 flags, challengelen, pad2, pad3; |
458 | u8 flags, challengelen, features, pad3; |
452 | u32 cipher_nid, digest_nid, hmac_nid; |
459 | u32 cipher_nid, digest_nid, hmac_nid; |
453 | |
|
|
454 | const u8 curflags () const |
|
|
455 | { |
|
|
456 | return 0x80 |
|
|
457 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
458 | } |
|
|
459 | |
460 | |
460 | void setup (ptype type, int dst); |
461 | void setup (ptype type, int dst); |
461 | 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 | return f; |
|
|
474 | } |
462 | }; |
475 | }; |
463 | |
476 | |
464 | void config_packet::setup (ptype type, int dst) |
477 | void config_packet::setup (ptype type, int dst) |
465 | { |
478 | { |
466 | prot_major = PROTOCOL_MAJOR; |
479 | prot_major = PROTOCOL_MAJOR; |
467 | prot_minor = PROTOCOL_MINOR; |
480 | prot_minor = PROTOCOL_MINOR; |
468 | randsize = RAND_SIZE; |
481 | randsize = RAND_SIZE; |
469 | hmaclen = HMACLENGTH; |
482 | hmaclen = HMACLENGTH; |
470 | flags = curflags (); |
483 | flags = 0; |
471 | challengelen = sizeof (rsachallenge); |
484 | challengelen = sizeof (rsachallenge); |
|
|
485 | features = get_features (); |
472 | |
486 | |
473 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
487 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
474 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
488 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
475 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
489 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
476 | |
490 | |
… | |
… | |
484 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
498 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
485 | else if (randsize != RAND_SIZE) |
499 | else if (randsize != RAND_SIZE) |
486 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
500 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
487 | else if (hmaclen != HMACLENGTH) |
501 | else if (hmaclen != HMACLENGTH) |
488 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
502 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
489 | else if (flags != curflags ()) |
|
|
490 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
491 | else if (challengelen != sizeof (rsachallenge)) |
503 | else if (challengelen != sizeof (rsachallenge)) |
492 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
504 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
505 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
494 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
506 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
495 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
507 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
… | |
… | |
504 | |
516 | |
505 | struct auth_req_packet : config_packet |
517 | struct auth_req_packet : config_packet |
506 | { |
518 | { |
507 | char magic[8]; |
519 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
520 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
521 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
522 | u8 pad2, pad3; |
511 | rsaid id; |
523 | rsaid id; |
512 | rsaencrdata encr; |
524 | rsaencrdata encr; |
513 | |
525 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
526 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
575 | { |
587 | { |
576 | if (ictx && octx) |
588 | if (ictx && octx) |
577 | { |
589 | { |
578 | connectmode = conf->connectmode; |
590 | connectmode = conf->connectmode; |
579 | |
591 | |
|
|
592 | // make sure rekeying timeouts are slightly asymmetric |
580 | rekey.start (NOW + ::conf.rekey); |
593 | rekey.start (NOW + ::conf.rekey |
|
|
594 | + (conf->id > THISNODE->id ? 10 : 0)); |
581 | keepalive.start (NOW + ::conf.keepalive); |
595 | keepalive.start (NOW + ::conf.keepalive); |
582 | |
596 | |
583 | // send queued packets |
597 | // send queued packets |
584 | if (ictx && octx) |
598 | if (ictx && octx) |
585 | { |
599 | { |
… | |
… | |
611 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
625 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
612 | |
626 | |
613 | // mask out protocols we cannot establish |
627 | // mask out protocols we cannot establish |
614 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
628 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
615 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
629 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
630 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
616 | |
631 | |
617 | si.set (conf, protocol); |
632 | si.set (conf, protocol); |
618 | } |
633 | } |
619 | |
634 | |
620 | // ensure sockinfo is valid, forward if necessary |
635 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
625 | { |
640 | { |
626 | connection *r = vpn->find_router (); |
641 | connection *r = vpn->find_router (); |
627 | |
642 | |
628 | if (r) |
643 | if (r) |
629 | { |
644 | { |
630 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
645 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
631 | conf->nodename, r->conf->nodename); |
646 | conf->nodename, r->conf->nodename, (const char *)r->si); |
632 | return r->si; |
647 | return r->si; |
633 | } |
648 | } |
634 | else |
649 | else |
635 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
650 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
636 | conf->nodename); |
651 | conf->nodename); |
… | |
… | |
726 | && conf != THISNODE |
741 | && conf != THISNODE |
727 | && connectmode != conf_node::C_NEVER |
742 | && connectmode != conf_node::C_NEVER |
728 | && connectmode != conf_node::C_DISABLED |
743 | && connectmode != conf_node::C_DISABLED |
729 | && NOW > w.at) |
744 | && NOW > w.at) |
730 | { |
745 | { |
731 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
746 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
732 | |
747 | |
733 | if (retry_int < 3600 * 8) |
748 | double retry_int = double (retry_cnt & 3 |
734 | retry_cnt++; |
749 | ? (retry_cnt & 3) + 1 |
735 | |
750 | : 1 << (retry_cnt >> 2)); |
736 | w.start (NOW + retry_int); |
|
|
737 | |
751 | |
738 | reset_si (); |
752 | reset_si (); |
|
|
753 | |
|
|
754 | bool slow = si.prot & PROT_SLOW; |
739 | |
755 | |
740 | if (si.prot && !si.host) |
756 | if (si.prot && !si.host) |
741 | vpn->send_connect_request (conf->id); |
757 | vpn->send_connect_request (conf->id); |
742 | else |
758 | else |
743 | { |
759 | { |
744 | const sockinfo &dsi = forward_si (si); |
760 | const sockinfo &dsi = forward_si (si); |
|
|
761 | |
|
|
762 | slow = slow || (dsi.prot & PROT_SLOW); |
745 | |
763 | |
746 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
764 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
747 | { |
765 | { |
748 | if (retry_cnt < 4) |
766 | if (retry_cnt < 4) |
749 | send_auth_request (dsi, true); |
767 | send_auth_request (dsi, true); |
750 | else |
768 | else |
751 | send_ping (dsi, 0); |
769 | send_ping (dsi, 0); |
752 | } |
770 | } |
753 | } |
771 | } |
|
|
772 | |
|
|
773 | retry_int *= slow ? 8. : 0.7; |
|
|
774 | |
|
|
775 | if (retry_int < conf->max_retry) |
|
|
776 | retry_cnt++; |
|
|
777 | else |
|
|
778 | retry_int = conf->max_retry; |
|
|
779 | |
|
|
780 | w.start (NOW + retry_int); |
754 | } |
781 | } |
755 | } |
782 | } |
756 | |
783 | |
757 | void |
784 | void |
758 | connection::reset_connection () |
785 | connection::reset_connection () |
… | |
… | |
766 | run_script (run_script_cb (this, &connection::script_node_down), false); |
793 | run_script (run_script_cb (this, &connection::script_node_down), false); |
767 | } |
794 | } |
768 | |
795 | |
769 | delete ictx; ictx = 0; |
796 | delete ictx; ictx = 0; |
770 | delete octx; octx = 0; |
797 | delete octx; octx = 0; |
|
|
798 | #if ENABLE_DNS |
|
|
799 | dnsv4_reset_connection (); |
|
|
800 | #endif |
771 | |
801 | |
772 | si.host= 0; |
802 | si.host = 0; |
773 | |
803 | |
774 | last_activity = 0; |
804 | last_activity = 0; |
775 | retry_cnt = 0; |
805 | retry_cnt = 0; |
776 | |
806 | |
777 | rekey.stop (); |
807 | rekey.stop (); |
… | |
… | |
832 | { |
862 | { |
833 | if (ictx && octx) |
863 | if (ictx && octx) |
834 | send_vpn_packet (pkt, si, tos); |
864 | send_vpn_packet (pkt, si, tos); |
835 | else |
865 | else |
836 | { |
866 | { |
837 | vpn_queue.put (new vpn_packet (*pkt)); |
867 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
838 | |
868 | |
839 | establish_connection (); |
869 | establish_connection (); |
840 | } |
870 | } |
841 | } |
871 | } |
842 | |
872 | |
… | |
… | |
915 | |
945 | |
916 | octx = new crypto_ctx (k, 1); |
946 | octx = new crypto_ctx (k, 1); |
917 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
947 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
918 | |
948 | |
919 | conf->protocols = p->protocols; |
949 | conf->protocols = p->protocols; |
|
|
950 | features = p->features & config_packet::get_features (); |
920 | |
951 | |
921 | send_auth_response (rsi, p->id, k); |
952 | send_auth_response (rsi, p->id, k); |
922 | |
953 | |
923 | connection_established (); |
954 | connection_established (); |
924 | |
955 | |
… | |
… | |
960 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
991 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
961 | |
992 | |
962 | if (!p->hmac_chk (cctx)) |
993 | if (!p->hmac_chk (cctx)) |
963 | { |
994 | { |
964 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
995 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
965 | "could be an attack, or just corruption or an synchronization error"), |
996 | "could be an attack, or just corruption or a synchronization error"), |
966 | conf->nodename, (const char *)rsi); |
997 | conf->nodename, (const char *)rsi); |
967 | break; |
998 | break; |
968 | } |
999 | } |
969 | else |
1000 | else |
970 | { |
1001 | { |
… | |
… | |
1019 | { |
1050 | { |
1020 | vpndata_packet *p = (vpndata_packet *)pkt; |
1051 | vpndata_packet *p = (vpndata_packet *)pkt; |
1021 | |
1052 | |
1022 | if (!p->hmac_chk (ictx)) |
1053 | if (!p->hmac_chk (ictx)) |
1023 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1054 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1024 | "could be an attack, or just corruption or an synchronization error"), |
1055 | "could be an attack, or just corruption or a synchronization error"), |
1025 | conf->nodename, (const char *)rsi); |
1056 | conf->nodename, (const char *)rsi); |
1026 | else |
1057 | else |
1027 | { |
1058 | { |
1028 | u32 seqno; |
1059 | u32 seqno; |
1029 | tap_packet *d = p->unpack (this, seqno); |
1060 | tap_packet *d = p->unpack (this, seqno); |
… | |
… | |
1038 | si = rsi; |
1069 | si = rsi; |
1039 | |
1070 | |
1040 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1071 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1041 | conf->nodename, (const char *)si, (const char *)rsi); |
1072 | conf->nodename, (const char *)si, (const char *)rsi); |
1042 | } |
1073 | } |
1043 | |
|
|
1044 | delete d; |
|
|
1045 | |
|
|
1046 | break; |
|
|
1047 | } |
1074 | } |
|
|
1075 | |
|
|
1076 | delete d; |
|
|
1077 | break; |
1048 | } |
1078 | } |
1049 | } |
1079 | } |
1050 | |
1080 | |
1051 | send_reset (rsi); |
1081 | send_reset (rsi); |
1052 | break; |
1082 | break; |
… | |
… | |
1077 | break; |
1107 | break; |
1078 | |
1108 | |
1079 | case vpn_packet::PT_CONNECT_INFO: |
1109 | case vpn_packet::PT_CONNECT_INFO: |
1080 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1110 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1081 | { |
1111 | { |
1082 | connect_info_packet *p = (connect_info_packet *) pkt; |
1112 | connect_info_packet *p = (connect_info_packet *)pkt; |
1083 | |
1113 | |
1084 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1114 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1085 | |
1115 | { |
1086 | connection *c = vpn->conns[p->id - 1]; |
1116 | connection *c = vpn->conns[p->id - 1]; |
1087 | |
1117 | |
1088 | c->conf->protocols = p->protocols; |
1118 | c->conf->protocols = p->protocols; |
1089 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1119 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1090 | p->si.upgrade_protocol (protocol, c->conf); |
1120 | p->si.upgrade_protocol (protocol, c->conf); |
1091 | |
1121 | |
1092 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1122 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1093 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1123 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1094 | |
1124 | |
1095 | const sockinfo &dsi = forward_si (p->si); |
1125 | const sockinfo &dsi = forward_si (p->si); |
1096 | |
1126 | |
1097 | if (dsi.valid ()) |
1127 | if (dsi.valid ()) |
1098 | c->send_auth_request (dsi, true); |
1128 | c->send_auth_request (dsi, true); |
|
|
1129 | } |
1099 | } |
1130 | } |
1100 | |
1131 | |
1101 | break; |
1132 | break; |
1102 | |
1133 | |
1103 | default: |
1134 | default: |
… | |
… | |
1167 | putenv ("STATE=down"); |
1198 | putenv ("STATE=down"); |
1168 | |
1199 | |
1169 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1200 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1170 | } |
1201 | } |
1171 | |
1202 | |
1172 | connection::connection(struct vpn *vpn_) |
1203 | connection::connection (struct vpn *vpn, conf_node *conf) |
1173 | : vpn(vpn_) |
1204 | : vpn(vpn), conf(conf) |
1174 | , rekey (this, &connection::rekey_cb) |
1205 | , rekey (this, &connection::rekey_cb) |
1175 | , keepalive (this, &connection::keepalive_cb) |
1206 | , keepalive (this, &connection::keepalive_cb) |
1176 | , establish_connection (this, &connection::establish_connection_cb) |
1207 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1208 | #if ENABLE_DNS |
|
|
1209 | , dns (0) |
|
|
1210 | #endif |
1177 | { |
1211 | { |
1178 | octx = ictx = 0; |
1212 | octx = ictx = 0; |
1179 | retry_cnt = 0; |
1213 | retry_cnt = 0; |
1180 | |
1214 | |
|
|
1215 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1216 | conf->protocols = PROT_UDPv4; |
|
|
1217 | |
1181 | connectmode = conf_node::C_ALWAYS; // initial setting |
1218 | connectmode = conf_node::C_ALWAYS; // initial setting |
1182 | reset_connection (); |
1219 | reset_connection (); |
1183 | } |
1220 | } |
1184 | |
1221 | |
1185 | connection::~connection () |
1222 | connection::~connection () |