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) 2003-2004 Marc Lehmann <pcg@goof.com> |
4 | |
4 | |
5 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
6 | it under the terms of the GNU General Public License as published by |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
18 | */ |
18 | */ |
19 | |
19 | |
20 | #include "config.h" |
20 | #include "config.h" |
21 | |
21 | |
22 | extern "C" { |
22 | #include <cassert> |
23 | # include "lzf/lzf.h" |
|
|
24 | } |
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25 | |
23 | |
26 | #include <list> |
24 | #include <list> |
27 | |
25 | |
28 | #include <openssl/rand.h> |
26 | #include <openssl/rand.h> |
29 | #include <openssl/evp.h> |
27 | #include <openssl/evp.h> |
… | |
… | |
44 | # define RAND_pseudo_bytes RAND_bytes |
42 | # define RAND_pseudo_bytes RAND_bytes |
45 | #endif |
43 | #endif |
46 | |
44 | |
47 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
48 | |
46 | |
|
|
47 | #define ULTRA_FAST 1 |
|
|
48 | #define HLOG 15 |
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|
49 | #include "lzf/lzf.h" |
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|
50 | #include "lzf/lzf_c.c" |
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|
51 | #include "lzf/lzf_d.c" |
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|
52 | |
49 | struct crypto_ctx |
53 | struct crypto_ctx |
50 | { |
54 | { |
51 | EVP_CIPHER_CTX cctx; |
55 | EVP_CIPHER_CTX cctx; |
52 | HMAC_CTX hctx; |
56 | HMAC_CTX hctx; |
53 | |
57 | |
… | |
… | |
56 | }; |
60 | }; |
57 | |
61 | |
58 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
62 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
59 | { |
63 | { |
60 | EVP_CIPHER_CTX_init (&cctx); |
64 | EVP_CIPHER_CTX_init (&cctx); |
61 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
65 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
62 | HMAC_CTX_init (&hctx); |
66 | HMAC_CTX_init (&hctx); |
63 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
67 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
64 | } |
68 | } |
65 | |
69 | |
66 | crypto_ctx::~crypto_ctx () |
70 | crypto_ctx::~crypto_ctx () |
67 | { |
71 | { |
68 | EVP_CIPHER_CTX_cleanup (&cctx); |
72 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
69 | HMAC_CTX_cleanup (&hctx); |
73 | HMAC_CTX_cleanup (&hctx); |
70 | } |
74 | } |
71 | |
75 | |
72 | static void |
76 | static void |
73 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
77 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
74 | { |
78 | { |
75 | EVP_MD_CTX ctx; |
79 | EVP_MD_CTX ctx; |
76 | |
80 | |
77 | EVP_MD_CTX_init (&ctx); |
81 | EVP_MD_CTX_init (&ctx); |
78 | EVP_DigestInit (&ctx, RSA_HASH); |
82 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
79 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
83 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
80 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
84 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
81 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
85 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
82 | EVP_MD_CTX_cleanup (&ctx); |
86 | EVP_MD_CTX_cleanup (&ctx); |
83 | } |
87 | } |
84 | |
88 | |
85 | struct rsa_entry { |
89 | struct rsa_entry { |
86 | tstamp expire; |
90 | tstamp expire; |
… | |
… | |
134 | |
138 | |
135 | } rsa_cache; |
139 | } rsa_cache; |
136 | |
140 | |
137 | void rsa_cache::cleaner_cb (time_watcher &w) |
141 | void rsa_cache::cleaner_cb (time_watcher &w) |
138 | { |
142 | { |
139 | if (empty ()) |
143 | if (!empty ()) |
140 | w.at = TSTAMP_CANCEL; |
|
|
141 | else |
|
|
142 | { |
144 | { |
143 | w.at = NOW + RSA_TTL; |
145 | w.start (NOW + RSA_TTL); |
144 | |
146 | |
145 | for (iterator i = begin (); i != end (); ) |
147 | for (iterator i = begin (); i != end (); ) |
146 | if (i->expire <= NOW) |
148 | if (i->expire <= NOW) |
147 | i = erase (i); |
149 | i = erase (i); |
148 | else |
150 | else |
… | |
… | |
200 | // only do action once every x seconds per host whole allowing bursts. |
202 | // only do action once every x seconds per host whole allowing bursts. |
201 | // this implementation ("splay list" ;) is inefficient, |
203 | // this implementation ("splay list" ;) is inefficient, |
202 | // but low on resources. |
204 | // but low on resources. |
203 | struct net_rate_limiter : list<net_rateinfo> |
205 | struct net_rate_limiter : list<net_rateinfo> |
204 | { |
206 | { |
205 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
207 | # define NRL_ALPHA 1. - 1. / 600. // allow bursts |
206 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
208 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
207 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
209 | # define NRL_EXPIRE NRL_CUTOFF * 30. // expire entries after this time |
208 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
210 | # define NRL_MAXDIF NRL_CUTOFF * (1. / (1. - NRL_ALPHA)) // maximum diff /count value |
209 | |
211 | |
210 | bool can (const sockinfo &si) { return can((u32)si.host); } |
212 | bool can (const sockinfo &si) { return can((u32)si.host); } |
211 | bool can (u32 host); |
213 | bool can (u32 host); |
212 | }; |
214 | }; |
213 | |
215 | |
… | |
… | |
218 | iterator i; |
220 | iterator i; |
219 | |
221 | |
220 | for (i = begin (); i != end (); ) |
222 | for (i = begin (); i != end (); ) |
221 | if (i->host == host) |
223 | if (i->host == host) |
222 | break; |
224 | break; |
223 | else if (i->last < NOW - EXPIRE) |
225 | else if (i->last < NOW - NRL_EXPIRE) |
224 | i = erase (i); |
226 | i = erase (i); |
225 | else |
227 | else |
226 | i++; |
228 | i++; |
227 | |
229 | |
228 | if (i == end ()) |
230 | if (i == end ()) |
229 | { |
231 | { |
230 | net_rateinfo ri; |
232 | net_rateinfo ri; |
231 | |
233 | |
232 | ri.host = host; |
234 | ri.host = host; |
233 | ri.pcnt = 1.; |
235 | ri.pcnt = 1.; |
234 | ri.diff = MAXDIF; |
236 | ri.diff = NRL_MAXDIF; |
235 | ri.last = NOW; |
237 | ri.last = NOW; |
236 | |
238 | |
237 | push_front (ri); |
239 | push_front (ri); |
238 | |
240 | |
239 | return true; |
241 | return true; |
… | |
… | |
241 | else |
243 | else |
242 | { |
244 | { |
243 | net_rateinfo ri (*i); |
245 | net_rateinfo ri (*i); |
244 | erase (i); |
246 | erase (i); |
245 | |
247 | |
246 | ri.pcnt = ri.pcnt * ALPHA; |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
247 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
249 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
248 | |
250 | |
249 | ri.last = NOW; |
251 | ri.last = NOW; |
250 | |
252 | |
251 | double dif = ri.diff / ri.pcnt; |
253 | double dif = ri.diff / ri.pcnt; |
252 | |
254 | |
253 | bool send = dif > CUTOFF; |
255 | bool send = dif > NRL_CUTOFF; |
254 | |
256 | |
255 | if (dif > MAXDIF) |
257 | if (dif > NRL_MAXDIF) |
256 | { |
258 | { |
257 | ri.pcnt = 1.; |
259 | ri.pcnt = 1.; |
258 | ri.diff = MAXDIF; |
260 | ri.diff = NRL_MAXDIF; |
259 | } |
261 | } |
260 | else if (send) |
262 | else if (send) |
261 | ri.pcnt++; |
263 | ri.pcnt++; |
262 | |
264 | |
263 | push_front (ri); |
265 | push_front (ri); |
… | |
… | |
310 | } |
312 | } |
311 | |
313 | |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
314 | |
316 | |
315 | struct vpndata_packet:vpn_packet |
317 | struct vpndata_packet : vpn_packet |
316 | { |
318 | { |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
318 | |
320 | |
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
321 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
322 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
333 | int outl = 0, outl2; |
335 | int outl = 0, outl2; |
334 | ptype type = PT_DATA_UNCOMPRESSED; |
336 | ptype type = PT_DATA_UNCOMPRESSED; |
335 | |
337 | |
336 | #if ENABLE_COMPRESSION |
338 | #if ENABLE_COMPRESSION |
337 | u8 cdata[MAX_MTU]; |
339 | u8 cdata[MAX_MTU]; |
338 | u32 cl; |
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|
339 | |
340 | |
|
|
341 | if (conn->features & ENABLE_COMPRESSION) |
|
|
342 | { |
340 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
343 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
|
|
344 | |
341 | if (cl) |
345 | if (cl) |
342 | { |
346 | { |
343 | type = PT_DATA_COMPRESSED; |
347 | type = PT_DATA_COMPRESSED; |
344 | d = cdata; |
348 | d = cdata; |
345 | l = cl + 2; |
349 | l = cl + 2; |
346 | |
350 | |
347 | d[0] = cl >> 8; |
351 | d[0] = cl >> 8; |
348 | d[1] = cl; |
352 | d[1] = cl; |
|
|
353 | } |
349 | } |
354 | } |
350 | #endif |
355 | #endif |
351 | |
356 | |
352 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
357 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
353 | |
358 | |
354 | struct { |
359 | struct { |
355 | #if RAND_SIZE |
360 | #if RAND_SIZE |
356 | u8 rnd[RAND_SIZE]; |
361 | u8 rnd[RAND_SIZE]; |
357 | #endif |
362 | #endif |
… | |
… | |
361 | datahdr.seqno = ntohl (seqno); |
366 | datahdr.seqno = ntohl (seqno); |
362 | #if RAND_SIZE |
367 | #if RAND_SIZE |
363 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
368 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
364 | #endif |
369 | #endif |
365 | |
370 | |
366 | EVP_EncryptUpdate (cctx, |
371 | require (EVP_EncryptUpdate (cctx, |
367 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) data + outl, &outl2, |
368 | (unsigned char *) &datahdr, DATAHDR); |
373 | (unsigned char *) &datahdr, DATAHDR)); |
369 | outl += outl2; |
374 | outl += outl2; |
370 | |
375 | |
371 | EVP_EncryptUpdate (cctx, |
376 | require (EVP_EncryptUpdate (cctx, |
372 | (unsigned char *) data + outl, &outl2, |
377 | (unsigned char *) data + outl, &outl2, |
373 | (unsigned char *) d, l); |
378 | (unsigned char *) d, l)); |
374 | outl += outl2; |
379 | outl += outl2; |
375 | |
380 | |
376 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
381 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
377 | outl += outl2; |
382 | outl += outl2; |
378 | |
383 | |
379 | len = outl + data_hdr_size (); |
384 | len = outl + data_hdr_size (); |
380 | |
385 | |
381 | set_hdr (type, dst); |
386 | set_hdr (type, dst); |
… | |
… | |
390 | int outl = 0, outl2; |
395 | int outl = 0, outl2; |
391 | tap_packet *p = new tap_packet; |
396 | tap_packet *p = new tap_packet; |
392 | u8 *d; |
397 | u8 *d; |
393 | u32 l = len - data_hdr_size (); |
398 | u32 l = len - data_hdr_size (); |
394 | |
399 | |
395 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
400 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
396 | |
401 | |
397 | #if ENABLE_COMPRESSION |
402 | #if ENABLE_COMPRESSION |
398 | u8 cdata[MAX_MTU]; |
403 | u8 cdata[MAX_MTU]; |
399 | |
404 | |
400 | if (type == PT_DATA_COMPRESSED) |
405 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
402 | else |
407 | else |
403 | #endif |
408 | #endif |
404 | d = &(*p)[6 + 6 - DATAHDR]; |
409 | d = &(*p)[6 + 6 - DATAHDR]; |
405 | |
410 | |
406 | /* this overwrites part of the src mac, but we fix that later */ |
411 | /* this overwrites part of the src mac, but we fix that later */ |
407 | EVP_DecryptUpdate (cctx, |
412 | require (EVP_DecryptUpdate (cctx, |
408 | d, &outl2, |
413 | d, &outl2, |
409 | (unsigned char *)&data, len - data_hdr_size ()); |
414 | (unsigned char *)&data, len - data_hdr_size ())); |
410 | outl += outl2; |
415 | outl += outl2; |
411 | |
416 | |
412 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
417 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
413 | outl += outl2; |
418 | outl += outl2; |
414 | |
419 | |
415 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
420 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
416 | |
421 | |
417 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
422 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
446 | { |
451 | { |
447 | // actually, hmaclen cannot be checked because the hmac |
452 | // actually, hmaclen cannot be checked because the hmac |
448 | // field comes before this data, so peers with other |
453 | // field comes before this data, so peers with other |
449 | // hmacs simply will not work. |
454 | // hmacs simply will not work. |
450 | u8 prot_major, prot_minor, randsize, hmaclen; |
455 | u8 prot_major, prot_minor, randsize, hmaclen; |
451 | u8 flags, challengelen, pad2, pad3; |
456 | u8 flags, challengelen, features, pad3; |
452 | u32 cipher_nid, digest_nid, hmac_nid; |
457 | u32 cipher_nid, digest_nid, hmac_nid; |
453 | |
|
|
454 | const u8 curflags () const |
|
|
455 | { |
|
|
456 | return 0x80 |
|
|
457 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
458 | } |
|
|
459 | |
458 | |
460 | void setup (ptype type, int dst); |
459 | void setup (ptype type, int dst); |
461 | bool chk_config () const; |
460 | bool chk_config () const; |
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|
461 | |
|
|
462 | static u8 get_features () |
|
|
463 | { |
|
|
464 | u8 f = 0; |
|
|
465 | #if ENABLE_COMPRESSION |
|
|
466 | f |= FEATURE_COMPRESSION; |
|
|
467 | #endif |
|
|
468 | #if ENABLE_ROHC |
|
|
469 | f |= FEATURE_ROHC; |
|
|
470 | #endif |
|
|
471 | return f; |
|
|
472 | } |
462 | }; |
473 | }; |
463 | |
474 | |
464 | void config_packet::setup (ptype type, int dst) |
475 | void config_packet::setup (ptype type, int dst) |
465 | { |
476 | { |
466 | prot_major = PROTOCOL_MAJOR; |
477 | prot_major = PROTOCOL_MAJOR; |
467 | prot_minor = PROTOCOL_MINOR; |
478 | prot_minor = PROTOCOL_MINOR; |
468 | randsize = RAND_SIZE; |
479 | randsize = RAND_SIZE; |
469 | hmaclen = HMACLENGTH; |
480 | hmaclen = HMACLENGTH; |
470 | flags = curflags (); |
481 | flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
471 | challengelen = sizeof (rsachallenge); |
482 | challengelen = sizeof (rsachallenge); |
|
|
483 | features = get_features (); |
472 | |
484 | |
473 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
485 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
474 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
486 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
475 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
487 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
476 | |
488 | |
… | |
… | |
479 | } |
491 | } |
480 | |
492 | |
481 | bool config_packet::chk_config () const |
493 | bool config_packet::chk_config () const |
482 | { |
494 | { |
483 | if (prot_major != PROTOCOL_MAJOR) |
495 | if (prot_major != PROTOCOL_MAJOR) |
484 | slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); |
496 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
485 | else if (randsize != RAND_SIZE) |
497 | else if (randsize != RAND_SIZE) |
486 | slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); |
498 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
487 | else if (hmaclen != HMACLENGTH) |
499 | else if (hmaclen != HMACLENGTH) |
488 | slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
500 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
501 | #if 0 // this implementation should handle all flag settings |
489 | else if (flags != curflags ()) |
502 | else if (flags != curflags ()) |
490 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
503 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
504 | #endif |
491 | else if (challengelen != sizeof (rsachallenge)) |
505 | else if (challengelen != sizeof (rsachallenge)) |
492 | slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); |
506 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
507 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
494 | slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
508 | 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))) |
509 | 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)); |
510 | 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))) |
511 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
498 | slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
512 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
499 | else |
513 | else |
500 | return true; |
514 | return true; |
501 | |
515 | |
502 | return false; |
516 | return false; |
503 | } |
517 | } |
504 | |
518 | |
505 | struct auth_req_packet : config_packet |
519 | struct auth_req_packet : config_packet |
506 | { |
520 | { |
507 | char magic[8]; |
521 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
522 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
523 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
524 | u8 pad2, pad3; |
511 | rsaid id; |
525 | rsaid id; |
512 | rsaencrdata encr; |
526 | rsaencrdata encr; |
513 | |
527 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
528 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
598 | } |
612 | } |
599 | else |
613 | else |
600 | { |
614 | { |
601 | retry_cnt = 0; |
615 | retry_cnt = 0; |
602 | establish_connection.start (NOW + 5); |
616 | establish_connection.start (NOW + 5); |
603 | keepalive.reset (); |
617 | keepalive.stop (); |
604 | rekey.reset (); |
618 | rekey.stop (); |
605 | } |
619 | } |
606 | } |
620 | } |
607 | |
621 | |
608 | void |
622 | void |
609 | connection::reset_si () |
623 | connection::reset_si () |
… | |
… | |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
689 | connection::send_auth_request (const sockinfo &si, bool initiate) |
676 | { |
690 | { |
677 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
691 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
678 | |
692 | |
679 | rsachallenge chg; |
693 | rsachallenge chg; |
680 | |
|
|
681 | rsa_cache.gen (pkt->id, chg); |
694 | rsa_cache.gen (pkt->id, chg); |
682 | |
695 | 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 | |
696 | |
688 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
697 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
689 | |
698 | |
690 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
699 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
691 | |
700 | |
… | |
… | |
725 | } |
734 | } |
726 | |
735 | |
727 | void |
736 | void |
728 | connection::establish_connection_cb (time_watcher &w) |
737 | connection::establish_connection_cb (time_watcher &w) |
729 | { |
738 | { |
730 | if (ictx || conf == THISNODE |
739 | if (!ictx |
|
|
740 | && conf != THISNODE |
731 | || connectmode == conf_node::C_NEVER |
741 | && connectmode != conf_node::C_NEVER |
732 | || connectmode == conf_node::C_DISABLED) |
742 | && connectmode != conf_node::C_DISABLED |
733 | w.at = TSTAMP_CANCEL; |
743 | && NOW > w.at) |
734 | else if (w.at <= NOW) |
|
|
735 | { |
744 | { |
736 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
745 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
737 | |
746 | |
738 | if (retry_int < 3600 * 8) |
747 | if (retry_int < 3600 * 8) |
739 | retry_cnt++; |
748 | retry_cnt++; |
740 | |
749 | |
741 | w.at = NOW + retry_int; |
750 | w.start (NOW + retry_int); |
742 | |
751 | |
743 | reset_si (); |
752 | reset_si (); |
744 | |
753 | |
745 | if (si.prot && !si.host) |
754 | if (si.prot && !si.host) |
746 | vpn->send_connect_request (conf->id); |
755 | vpn->send_connect_request (conf->id); |
… | |
… | |
777 | si.host= 0; |
786 | si.host= 0; |
778 | |
787 | |
779 | last_activity = 0; |
788 | last_activity = 0; |
780 | retry_cnt = 0; |
789 | retry_cnt = 0; |
781 | |
790 | |
782 | rekey.reset (); |
791 | rekey.stop (); |
783 | keepalive.reset (); |
792 | keepalive.stop (); |
784 | establish_connection.reset (); |
793 | establish_connection.stop (); |
785 | } |
794 | } |
786 | |
795 | |
787 | void |
796 | void |
788 | connection::shutdown () |
797 | connection::shutdown () |
789 | { |
798 | { |
… | |
… | |
794 | } |
803 | } |
795 | |
804 | |
796 | void |
805 | void |
797 | connection::rekey_cb (time_watcher &w) |
806 | connection::rekey_cb (time_watcher &w) |
798 | { |
807 | { |
799 | w.at = TSTAMP_CANCEL; |
|
|
800 | |
|
|
801 | reset_connection (); |
808 | reset_connection (); |
802 | establish_connection (); |
809 | establish_connection (); |
803 | } |
810 | } |
804 | |
811 | |
805 | void |
812 | void |
… | |
… | |
839 | { |
846 | { |
840 | if (ictx && octx) |
847 | if (ictx && octx) |
841 | send_vpn_packet (pkt, si, tos); |
848 | send_vpn_packet (pkt, si, tos); |
842 | else |
849 | else |
843 | { |
850 | { |
844 | vpn_queue.put (new vpn_packet (*pkt)); |
851 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
845 | |
852 | |
846 | establish_connection (); |
853 | establish_connection (); |
847 | } |
854 | } |
848 | } |
855 | } |
849 | |
856 | |
… | |
… | |
908 | if (p->initiate) |
915 | if (p->initiate) |
909 | send_auth_request (rsi, false); |
916 | send_auth_request (rsi, false); |
910 | |
917 | |
911 | rsachallenge k; |
918 | rsachallenge k; |
912 | |
919 | |
913 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
920 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
914 | (unsigned char *)&p->encr, (unsigned char *)&k, |
921 | { |
915 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
916 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
922 | 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)); |
923 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
924 | break; |
|
|
925 | } |
918 | else |
926 | else |
919 | { |
927 | { |
920 | delete octx; |
928 | delete octx; |
921 | |
929 | |
922 | octx = new crypto_ctx (k, 1); |
930 | octx = new crypto_ctx (k, 1); |
923 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
931 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
924 | |
932 | |
|
|
933 | // compatibility code, remove when no longer required |
|
|
934 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
935 | |
925 | conf->protocols = p->protocols; |
936 | conf->protocols = p->protocols; |
|
|
937 | features = p->features & config_packet::get_features (); |
926 | |
938 | |
927 | send_auth_response (rsi, p->id, k); |
939 | send_auth_response (rsi, p->id, k); |
928 | |
940 | |
929 | connection_established (); |
941 | connection_established (); |
930 | |
942 | |
… | |
… | |
966 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
978 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
967 | |
979 | |
968 | if (!p->hmac_chk (cctx)) |
980 | if (!p->hmac_chk (cctx)) |
969 | { |
981 | { |
970 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
982 | 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"), |
983 | "could be an attack, or just corruption or a synchronization error"), |
972 | conf->nodename, (const char *)rsi); |
984 | conf->nodename, (const char *)rsi); |
973 | break; |
985 | break; |
974 | } |
986 | } |
975 | else |
987 | else |
976 | { |
988 | { |
… | |
… | |
1025 | { |
1037 | { |
1026 | vpndata_packet *p = (vpndata_packet *)pkt; |
1038 | vpndata_packet *p = (vpndata_packet *)pkt; |
1027 | |
1039 | |
1028 | if (!p->hmac_chk (ictx)) |
1040 | if (!p->hmac_chk (ictx)) |
1029 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1041 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1030 | "could be an attack, or just corruption or an synchronization error"), |
1042 | "could be an attack, or just corruption or a synchronization error"), |
1031 | conf->nodename, (const char *)rsi); |
1043 | conf->nodename, (const char *)rsi); |
1032 | else |
1044 | else |
1033 | { |
1045 | { |
1034 | u32 seqno; |
1046 | u32 seqno; |
1035 | tap_packet *d = p->unpack (this, seqno); |
1047 | tap_packet *d = p->unpack (this, seqno); |
… | |
… | |
1044 | si = rsi; |
1056 | si = rsi; |
1045 | |
1057 | |
1046 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1058 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1047 | conf->nodename, (const char *)si, (const char *)rsi); |
1059 | conf->nodename, (const char *)si, (const char *)rsi); |
1048 | } |
1060 | } |
1049 | |
|
|
1050 | delete d; |
|
|
1051 | |
|
|
1052 | break; |
|
|
1053 | } |
1061 | } |
|
|
1062 | |
|
|
1063 | delete d; |
|
|
1064 | break; |
1054 | } |
1065 | } |
1055 | } |
1066 | } |
1056 | |
1067 | |
1057 | send_reset (rsi); |
1068 | send_reset (rsi); |
1058 | break; |
1069 | break; |
… | |
… | |
1118 | { |
1129 | { |
1119 | reset_connection (); |
1130 | reset_connection (); |
1120 | establish_connection (); |
1131 | establish_connection (); |
1121 | } |
1132 | } |
1122 | else if (NOW < last_activity + ::conf.keepalive) |
1133 | else if (NOW < last_activity + ::conf.keepalive) |
1123 | w.at = last_activity + ::conf.keepalive; |
1134 | w.start (last_activity + ::conf.keepalive); |
1124 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1135 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1125 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1136 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1126 | { |
1137 | { |
1127 | send_ping (si); |
1138 | send_ping (si); |
1128 | w.at = NOW + 5; |
1139 | w.start (NOW + 5); |
1129 | } |
1140 | } |
1130 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1141 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1131 | // hold ondemand connections implicitly a few seconds longer |
1142 | // hold ondemand connections implicitly a few seconds longer |
1132 | // should delete octx, though, or something like that ;) |
1143 | // should delete octx, though, or something like that ;) |
1133 | w.at = last_activity + ::conf.keepalive + 10; |
1144 | w.start (last_activity + ::conf.keepalive + 10); |
1134 | else |
1145 | else |
1135 | reset_connection (); |
1146 | reset_connection (); |
1136 | } |
1147 | } |
1137 | |
1148 | |
1138 | void connection::send_connect_request (int id) |
1149 | void connection::send_connect_request (int id) |