1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003 Marc Lehmann <pcg@goof.com> |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
|
|
5 | This file is part of GVPE. |
|
|
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 | |
23 | |
22 | extern "C" { |
24 | #include <cassert> |
23 | # include "lzf/lzf.h" |
|
|
24 | } |
|
|
25 | |
25 | |
26 | #include <list> |
26 | #include <list> |
27 | |
27 | |
28 | #include <openssl/rand.h> |
28 | #include <openssl/rand.h> |
29 | #include <openssl/evp.h> |
29 | #include <openssl/evp.h> |
… | |
… | |
44 | # define RAND_pseudo_bytes RAND_bytes |
44 | # define RAND_pseudo_bytes RAND_bytes |
45 | #endif |
45 | #endif |
46 | |
46 | |
47 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
47 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
48 | |
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" |
|
|
54 | |
49 | struct crypto_ctx |
55 | struct crypto_ctx |
50 | { |
56 | { |
51 | EVP_CIPHER_CTX cctx; |
57 | EVP_CIPHER_CTX cctx; |
52 | HMAC_CTX hctx; |
58 | HMAC_CTX hctx; |
53 | |
59 | |
… | |
… | |
56 | }; |
62 | }; |
57 | |
63 | |
58 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
64 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
59 | { |
65 | { |
60 | EVP_CIPHER_CTX_init (&cctx); |
66 | EVP_CIPHER_CTX_init (&cctx); |
61 | 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)); |
62 | HMAC_CTX_init (&hctx); |
68 | HMAC_CTX_init (&hctx); |
63 | 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); |
64 | } |
70 | } |
65 | |
71 | |
66 | crypto_ctx::~crypto_ctx () |
72 | crypto_ctx::~crypto_ctx () |
67 | { |
73 | { |
68 | EVP_CIPHER_CTX_cleanup (&cctx); |
74 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
69 | HMAC_CTX_cleanup (&hctx); |
75 | HMAC_CTX_cleanup (&hctx); |
70 | } |
76 | } |
71 | |
77 | |
72 | static void |
78 | static void |
73 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
79 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
74 | { |
80 | { |
75 | EVP_MD_CTX ctx; |
81 | EVP_MD_CTX ctx; |
76 | |
82 | |
77 | EVP_MD_CTX_init (&ctx); |
83 | EVP_MD_CTX_init (&ctx); |
78 | EVP_DigestInit (&ctx, RSA_HASH); |
84 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
79 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
85 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
80 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
86 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
81 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
87 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
82 | EVP_MD_CTX_cleanup (&ctx); |
88 | EVP_MD_CTX_cleanup (&ctx); |
83 | } |
89 | } |
84 | |
90 | |
85 | struct rsa_entry { |
91 | struct rsa_entry { |
86 | tstamp expire; |
92 | tstamp expire; |
… | |
… | |
134 | |
140 | |
135 | } rsa_cache; |
141 | } rsa_cache; |
136 | |
142 | |
137 | void rsa_cache::cleaner_cb (time_watcher &w) |
143 | void rsa_cache::cleaner_cb (time_watcher &w) |
138 | { |
144 | { |
139 | if (empty ()) |
145 | if (!empty ()) |
140 | w.at = TSTAMP_CANCEL; |
|
|
141 | else |
|
|
142 | { |
146 | { |
143 | w.at = NOW + RSA_TTL; |
147 | w.start (NOW + RSA_TTL); |
144 | |
148 | |
145 | for (iterator i = begin (); i != end (); ) |
149 | for (iterator i = begin (); i != end (); ) |
146 | if (i->expire <= NOW) |
150 | if (i->expire <= NOW) |
147 | i = erase (i); |
151 | i = erase (i); |
148 | else |
152 | else |
… | |
… | |
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 = ENABLE_COMPRESSION ? 0x81 : 0x80; |
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 | |
… | |
… | |
479 | } |
493 | } |
480 | |
494 | |
481 | bool config_packet::chk_config () const |
495 | bool config_packet::chk_config () const |
482 | { |
496 | { |
483 | if (prot_major != PROTOCOL_MAJOR) |
497 | if (prot_major != PROTOCOL_MAJOR) |
484 | slog (L_WARN, _("major version mismatch (%d <=> %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 (%d <=> %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 (%d <=> %d)"), hmaclen, HMACLENGTH); |
502 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
503 | #if 0 // this implementation should handle all flag settings |
489 | else if (flags != curflags ()) |
504 | else if (flags != curflags ()) |
490 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
505 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
506 | #endif |
491 | else if (challengelen != sizeof (rsachallenge)) |
507 | else if (challengelen != sizeof (rsachallenge)) |
492 | slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); |
508 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
509 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
494 | slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
510 | 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))) |
511 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
496 | slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
512 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
497 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
513 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
498 | slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
514 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
499 | else |
515 | else |
500 | return true; |
516 | return true; |
501 | |
517 | |
502 | return false; |
518 | return false; |
503 | } |
519 | } |
504 | |
520 | |
505 | struct auth_req_packet : config_packet |
521 | struct auth_req_packet : config_packet |
506 | { |
522 | { |
507 | char magic[8]; |
523 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
524 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
525 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
526 | u8 pad2, pad3; |
511 | rsaid id; |
527 | rsaid id; |
512 | rsaencrdata encr; |
528 | rsaencrdata encr; |
513 | |
529 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
530 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
575 | { |
591 | { |
576 | if (ictx && octx) |
592 | if (ictx && octx) |
577 | { |
593 | { |
578 | connectmode = conf->connectmode; |
594 | connectmode = conf->connectmode; |
579 | |
595 | |
|
|
596 | // make sure rekeying timeouts are slightly asymmetric |
580 | rekey.start (NOW + ::conf.rekey); |
597 | rekey.start (NOW + ::conf.rekey |
|
|
598 | + (conf->id > THISNODE->id ? 10 : 0)); |
581 | keepalive.start (NOW + ::conf.keepalive); |
599 | keepalive.start (NOW + ::conf.keepalive); |
582 | |
600 | |
583 | // send queued packets |
601 | // send queued packets |
584 | if (ictx && octx) |
602 | if (ictx && octx) |
585 | { |
603 | { |
… | |
… | |
598 | } |
616 | } |
599 | else |
617 | else |
600 | { |
618 | { |
601 | retry_cnt = 0; |
619 | retry_cnt = 0; |
602 | establish_connection.start (NOW + 5); |
620 | establish_connection.start (NOW + 5); |
603 | keepalive.reset (); |
621 | keepalive.stop (); |
604 | rekey.reset (); |
622 | rekey.stop (); |
605 | } |
623 | } |
606 | } |
624 | } |
607 | |
625 | |
608 | void |
626 | void |
609 | connection::reset_si () |
627 | connection::reset_si () |
… | |
… | |
611 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
629 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
612 | |
630 | |
613 | // mask out protocols we cannot establish |
631 | // mask out protocols we cannot establish |
614 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
632 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
615 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
633 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
634 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
616 | |
635 | |
617 | si.set (conf, protocol); |
636 | si.set (conf, protocol); |
618 | } |
637 | } |
619 | |
638 | |
620 | // ensure sockinfo is valid, forward if necessary |
639 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
640 | } |
659 | } |
641 | |
660 | |
642 | void |
661 | void |
643 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
662 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
644 | { |
663 | { |
645 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
664 | bool ok; |
|
|
665 | |
|
|
666 | switch (si.prot) |
|
|
667 | { |
|
|
668 | case PROT_IPv4: |
|
|
669 | ok = vpn->send_ipv4_packet (pkt, si, tos); break; |
|
|
670 | case PROT_UDPv4: |
|
|
671 | ok = vpn->send_udpv4_packet (pkt, si, tos); break; |
|
|
672 | #if ENABLE_TCP |
|
|
673 | case PROT_TCPv4: |
|
|
674 | ok = vpn->send_tcpv4_packet (pkt, si, tos); break; |
|
|
675 | #endif |
|
|
676 | #if ENABLE_ICMP |
|
|
677 | case PROT_ICMPv4: |
|
|
678 | ok = vpn->send_icmpv4_packet (pkt, si, tos); break; |
|
|
679 | #endif |
|
|
680 | #if ENABLE_DNS |
|
|
681 | case PROT_DNSv4: |
|
|
682 | ok = send_dnsv4_packet (pkt, si, tos); break; |
|
|
683 | #endif |
|
|
684 | |
|
|
685 | default: |
|
|
686 | slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si); |
|
|
687 | ok = false; |
|
|
688 | } |
|
|
689 | |
|
|
690 | if (!ok) |
646 | reset_connection (); |
691 | reset_connection (); |
647 | } |
692 | } |
648 | |
693 | |
649 | void |
694 | void |
650 | connection::send_ping (const sockinfo &si, u8 pong) |
695 | connection::send_ping (const sockinfo &si, u8 pong) |
… | |
… | |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
720 | connection::send_auth_request (const sockinfo &si, bool initiate) |
676 | { |
721 | { |
677 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
722 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
678 | |
723 | |
679 | rsachallenge chg; |
724 | rsachallenge chg; |
680 | |
|
|
681 | rsa_cache.gen (pkt->id, chg); |
725 | rsa_cache.gen (pkt->id, chg); |
682 | |
726 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
683 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
684 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
685 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
686 | fatal ("RSA_public_encrypt error"); |
|
|
687 | |
727 | |
688 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
728 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
689 | |
729 | |
690 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
730 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
691 | |
731 | |
… | |
… | |
725 | } |
765 | } |
726 | |
766 | |
727 | void |
767 | void |
728 | connection::establish_connection_cb (time_watcher &w) |
768 | connection::establish_connection_cb (time_watcher &w) |
729 | { |
769 | { |
730 | if (ictx || conf == THISNODE |
770 | if (!ictx |
|
|
771 | && conf != THISNODE |
731 | || connectmode == conf_node::C_NEVER |
772 | && connectmode != conf_node::C_NEVER |
732 | || connectmode == conf_node::C_DISABLED) |
773 | && connectmode != conf_node::C_DISABLED |
733 | w.at = TSTAMP_CANCEL; |
774 | && NOW > w.at) |
734 | else if (w.at <= NOW) |
|
|
735 | { |
775 | { |
736 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
776 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
737 | |
777 | |
738 | if (retry_int < 3600 * 8) |
778 | if (retry_int < conf->max_retry) |
739 | retry_cnt++; |
779 | retry_cnt++; |
|
|
780 | else |
|
|
781 | retry_int = conf->max_retry; |
740 | |
782 | |
741 | w.at = NOW + retry_int; |
783 | w.start (NOW + retry_int); |
742 | |
784 | |
743 | reset_si (); |
785 | reset_si (); |
744 | |
786 | |
745 | if (si.prot && !si.host) |
787 | if (si.prot && !si.host) |
746 | vpn->send_connect_request (conf->id); |
788 | vpn->send_connect_request (conf->id); |
… | |
… | |
772 | } |
814 | } |
773 | |
815 | |
774 | delete ictx; ictx = 0; |
816 | delete ictx; ictx = 0; |
775 | delete octx; octx = 0; |
817 | delete octx; octx = 0; |
776 | |
818 | |
777 | si.host= 0; |
819 | si.host = 0; |
778 | |
820 | |
779 | last_activity = 0; |
821 | last_activity = 0; |
780 | retry_cnt = 0; |
822 | retry_cnt = 0; |
781 | |
823 | |
782 | rekey.reset (); |
824 | rekey.stop (); |
783 | keepalive.reset (); |
825 | keepalive.stop (); |
784 | establish_connection.reset (); |
826 | establish_connection.stop (); |
785 | } |
827 | } |
786 | |
828 | |
787 | void |
829 | void |
788 | connection::shutdown () |
830 | connection::shutdown () |
789 | { |
831 | { |
… | |
… | |
794 | } |
836 | } |
795 | |
837 | |
796 | void |
838 | void |
797 | connection::rekey_cb (time_watcher &w) |
839 | connection::rekey_cb (time_watcher &w) |
798 | { |
840 | { |
799 | w.at = TSTAMP_CANCEL; |
|
|
800 | |
|
|
801 | reset_connection (); |
841 | reset_connection (); |
802 | establish_connection (); |
842 | establish_connection (); |
803 | } |
843 | } |
804 | |
844 | |
805 | void |
845 | void |
… | |
… | |
839 | { |
879 | { |
840 | if (ictx && octx) |
880 | if (ictx && octx) |
841 | send_vpn_packet (pkt, si, tos); |
881 | send_vpn_packet (pkt, si, tos); |
842 | else |
882 | else |
843 | { |
883 | { |
844 | vpn_queue.put (new vpn_packet (*pkt)); |
884 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
845 | |
885 | |
846 | establish_connection (); |
886 | establish_connection (); |
847 | } |
887 | } |
848 | } |
888 | } |
849 | |
889 | |
… | |
… | |
908 | if (p->initiate) |
948 | if (p->initiate) |
909 | send_auth_request (rsi, false); |
949 | send_auth_request (rsi, false); |
910 | |
950 | |
911 | rsachallenge k; |
951 | rsachallenge k; |
912 | |
952 | |
913 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
953 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
914 | (unsigned char *)&p->encr, (unsigned char *)&k, |
954 | { |
915 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
916 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
955 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
917 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
956 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
957 | break; |
|
|
958 | } |
918 | else |
959 | else |
919 | { |
960 | { |
920 | delete octx; |
961 | delete octx; |
921 | |
962 | |
922 | octx = new crypto_ctx (k, 1); |
963 | octx = new crypto_ctx (k, 1); |
923 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
964 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
924 | |
965 | |
|
|
966 | // compatibility code, remove when no longer required |
|
|
967 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
968 | |
925 | conf->protocols = p->protocols; |
969 | conf->protocols = p->protocols; |
|
|
970 | features = p->features & config_packet::get_features (); |
926 | |
971 | |
927 | send_auth_response (rsi, p->id, k); |
972 | send_auth_response (rsi, p->id, k); |
928 | |
973 | |
929 | connection_established (); |
974 | connection_established (); |
930 | |
975 | |
… | |
… | |
966 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1011 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
967 | |
1012 | |
968 | if (!p->hmac_chk (cctx)) |
1013 | if (!p->hmac_chk (cctx)) |
969 | { |
1014 | { |
970 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1015 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
971 | "could be an attack, or just corruption or an synchronization error"), |
1016 | "could be an attack, or just corruption or a synchronization error"), |
972 | conf->nodename, (const char *)rsi); |
1017 | conf->nodename, (const char *)rsi); |
973 | break; |
1018 | break; |
974 | } |
1019 | } |
975 | else |
1020 | else |
976 | { |
1021 | { |
… | |
… | |
1025 | { |
1070 | { |
1026 | vpndata_packet *p = (vpndata_packet *)pkt; |
1071 | vpndata_packet *p = (vpndata_packet *)pkt; |
1027 | |
1072 | |
1028 | if (!p->hmac_chk (ictx)) |
1073 | if (!p->hmac_chk (ictx)) |
1029 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1074 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1030 | "could be an attack, or just corruption or an synchronization error"), |
1075 | "could be an attack, or just corruption or a synchronization error"), |
1031 | conf->nodename, (const char *)rsi); |
1076 | conf->nodename, (const char *)rsi); |
1032 | else |
1077 | else |
1033 | { |
1078 | { |
1034 | u32 seqno; |
1079 | u32 seqno; |
1035 | tap_packet *d = p->unpack (this, seqno); |
1080 | tap_packet *d = p->unpack (this, seqno); |
… | |
… | |
1044 | si = rsi; |
1089 | si = rsi; |
1045 | |
1090 | |
1046 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1091 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1047 | conf->nodename, (const char *)si, (const char *)rsi); |
1092 | conf->nodename, (const char *)si, (const char *)rsi); |
1048 | } |
1093 | } |
1049 | |
|
|
1050 | delete d; |
|
|
1051 | |
|
|
1052 | break; |
|
|
1053 | } |
1094 | } |
|
|
1095 | |
|
|
1096 | delete d; |
|
|
1097 | break; |
1054 | } |
1098 | } |
1055 | } |
1099 | } |
1056 | |
1100 | |
1057 | send_reset (rsi); |
1101 | send_reset (rsi); |
1058 | break; |
1102 | break; |
… | |
… | |
1083 | break; |
1127 | break; |
1084 | |
1128 | |
1085 | case vpn_packet::PT_CONNECT_INFO: |
1129 | case vpn_packet::PT_CONNECT_INFO: |
1086 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1130 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1087 | { |
1131 | { |
1088 | connect_info_packet *p = (connect_info_packet *) pkt; |
1132 | connect_info_packet *p = (connect_info_packet *)pkt; |
1089 | |
1133 | |
1090 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1134 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1091 | |
1135 | { |
1092 | connection *c = vpn->conns[p->id - 1]; |
1136 | connection *c = vpn->conns[p->id - 1]; |
1093 | |
1137 | |
1094 | c->conf->protocols = p->protocols; |
1138 | c->conf->protocols = p->protocols; |
1095 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1139 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1096 | p->si.upgrade_protocol (protocol, c->conf); |
1140 | p->si.upgrade_protocol (protocol, c->conf); |
1097 | |
1141 | |
1098 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1142 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1099 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1143 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1100 | |
1144 | |
1101 | const sockinfo &dsi = forward_si (p->si); |
1145 | const sockinfo &dsi = forward_si (p->si); |
1102 | |
1146 | |
1103 | if (dsi.valid ()) |
1147 | if (dsi.valid ()) |
1104 | c->send_auth_request (dsi, true); |
1148 | c->send_auth_request (dsi, true); |
|
|
1149 | } |
1105 | } |
1150 | } |
1106 | |
1151 | |
1107 | break; |
1152 | break; |
1108 | |
1153 | |
1109 | default: |
1154 | default: |
… | |
… | |
1118 | { |
1163 | { |
1119 | reset_connection (); |
1164 | reset_connection (); |
1120 | establish_connection (); |
1165 | establish_connection (); |
1121 | } |
1166 | } |
1122 | else if (NOW < last_activity + ::conf.keepalive) |
1167 | else if (NOW < last_activity + ::conf.keepalive) |
1123 | w.at = last_activity + ::conf.keepalive; |
1168 | w.start (last_activity + ::conf.keepalive); |
1124 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1169 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1125 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1170 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1126 | { |
1171 | { |
1127 | send_ping (si); |
1172 | send_ping (si); |
1128 | w.at = NOW + 5; |
1173 | w.start (NOW + 5); |
1129 | } |
1174 | } |
1130 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1175 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1131 | // hold ondemand connections implicitly a few seconds longer |
1176 | // hold ondemand connections implicitly a few seconds longer |
1132 | // should delete octx, though, or something like that ;) |
1177 | // should delete octx, though, or something like that ;) |
1133 | w.at = last_activity + ::conf.keepalive + 10; |
1178 | w.start (last_activity + ::conf.keepalive + 10); |
1134 | else |
1179 | else |
1135 | reset_connection (); |
1180 | reset_connection (); |
1136 | } |
1181 | } |
1137 | |
1182 | |
1138 | void connection::send_connect_request (int id) |
1183 | void connection::send_connect_request (int id) |
… | |
… | |
1173 | putenv ("STATE=down"); |
1218 | putenv ("STATE=down"); |
1174 | |
1219 | |
1175 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1220 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1176 | } |
1221 | } |
1177 | |
1222 | |
1178 | connection::connection(struct vpn *vpn_) |
1223 | connection::connection (struct vpn *vpn, conf_node *conf) |
1179 | : vpn(vpn_) |
1224 | : vpn(vpn), conf(conf) |
1180 | , rekey (this, &connection::rekey_cb) |
1225 | , rekey (this, &connection::rekey_cb) |
1181 | , keepalive (this, &connection::keepalive_cb) |
1226 | , keepalive (this, &connection::keepalive_cb) |
1182 | , establish_connection (this, &connection::establish_connection_cb) |
1227 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1228 | #if ENABLE_DNS |
|
|
1229 | , dns (0) |
|
|
1230 | #endif |
1183 | { |
1231 | { |
1184 | octx = ictx = 0; |
1232 | octx = ictx = 0; |
1185 | retry_cnt = 0; |
1233 | retry_cnt = 0; |
1186 | |
1234 | |
|
|
1235 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1236 | conf->protocols = PROT_UDPv4; |
|
|
1237 | |
1187 | connectmode = conf_node::C_ALWAYS; // initial setting |
1238 | connectmode = conf_node::C_ALWAYS; // initial setting |
1188 | reset_connection (); |
1239 | reset_connection (); |
1189 | } |
1240 | } |
1190 | |
1241 | |
1191 | connection::~connection () |
1242 | connection::~connection () |