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 | |
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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 | |
23 | |
22 | extern "C" { |
24 | #include <cassert> |
23 | # include "lzf/lzf.h" |
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|
24 | } |
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|
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> |
30 | #include <openssl/rsa.h> |
30 | #include <openssl/rsa.h> |
31 | #include <openssl/err.h> |
31 | #include <openssl/err.h> |
32 | |
|
|
33 | #include "gettext.h" |
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|
34 | |
32 | |
35 | #include "conf.h" |
33 | #include "conf.h" |
36 | #include "slog.h" |
34 | #include "slog.h" |
37 | #include "device.h" |
35 | #include "device.h" |
38 | #include "vpn.h" |
36 | #include "vpn.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 |
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|
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; |
|
|
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 = 0; |
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 | |
… | |
… | |
484 | slog (L_WARN, _("major version mismatch (remote %d <=> local %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 (remote %d <=> local %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 (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
500 | 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)) |
501 | else if (challengelen != sizeof (rsachallenge)) |
492 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
502 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
503 | 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)); |
504 | 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))) |
505 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
… | |
… | |
504 | |
514 | |
505 | struct auth_req_packet : config_packet |
515 | struct auth_req_packet : config_packet |
506 | { |
516 | { |
507 | char magic[8]; |
517 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
518 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
519 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
520 | u8 pad2, pad3; |
511 | rsaid id; |
521 | rsaid id; |
512 | rsaencrdata encr; |
522 | rsaencrdata encr; |
513 | |
523 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
524 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
575 | { |
585 | { |
576 | if (ictx && octx) |
586 | if (ictx && octx) |
577 | { |
587 | { |
578 | connectmode = conf->connectmode; |
588 | connectmode = conf->connectmode; |
579 | |
589 | |
|
|
590 | // make sure rekeying timeouts are slightly asymmetric |
580 | rekey.start (NOW + ::conf.rekey); |
591 | rekey.start (NOW + ::conf.rekey |
|
|
592 | + (conf->id > THISNODE->id ? 10 : 0)); |
581 | keepalive.start (NOW + ::conf.keepalive); |
593 | keepalive.start (NOW + ::conf.keepalive); |
582 | |
594 | |
583 | // send queued packets |
595 | // send queued packets |
584 | if (ictx && octx) |
596 | if (ictx && octx) |
585 | { |
597 | { |
… | |
… | |
598 | } |
610 | } |
599 | else |
611 | else |
600 | { |
612 | { |
601 | retry_cnt = 0; |
613 | retry_cnt = 0; |
602 | establish_connection.start (NOW + 5); |
614 | establish_connection.start (NOW + 5); |
603 | keepalive.reset (); |
615 | keepalive.stop (); |
604 | rekey.reset (); |
616 | rekey.stop (); |
605 | } |
617 | } |
606 | } |
618 | } |
607 | |
619 | |
608 | void |
620 | void |
609 | connection::reset_si () |
621 | connection::reset_si () |
… | |
… | |
611 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
623 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
612 | |
624 | |
613 | // mask out protocols we cannot establish |
625 | // mask out protocols we cannot establish |
614 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
626 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
615 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
627 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
628 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
616 | |
629 | |
617 | si.set (conf, protocol); |
630 | si.set (conf, protocol); |
618 | } |
631 | } |
619 | |
632 | |
620 | // ensure sockinfo is valid, forward if necessary |
633 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
625 | { |
638 | { |
626 | connection *r = vpn->find_router (); |
639 | connection *r = vpn->find_router (); |
627 | |
640 | |
628 | if (r) |
641 | if (r) |
629 | { |
642 | { |
630 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
643 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
631 | conf->nodename, r->conf->nodename); |
644 | conf->nodename, r->conf->nodename, (const char *)r->si); |
632 | return r->si; |
645 | return r->si; |
633 | } |
646 | } |
634 | else |
647 | else |
635 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
648 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
636 | conf->nodename); |
649 | conf->nodename); |
… | |
… | |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
688 | connection::send_auth_request (const sockinfo &si, bool initiate) |
676 | { |
689 | { |
677 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
690 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
678 | |
691 | |
679 | rsachallenge chg; |
692 | rsachallenge chg; |
680 | |
|
|
681 | rsa_cache.gen (pkt->id, chg); |
693 | rsa_cache.gen (pkt->id, chg); |
682 | |
694 | 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 | |
695 | |
688 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
696 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
689 | |
697 | |
690 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
698 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
691 | |
699 | |
… | |
… | |
725 | } |
733 | } |
726 | |
734 | |
727 | void |
735 | void |
728 | connection::establish_connection_cb (time_watcher &w) |
736 | connection::establish_connection_cb (time_watcher &w) |
729 | { |
737 | { |
730 | if (ictx || conf == THISNODE |
738 | if (!ictx |
|
|
739 | && conf != THISNODE |
731 | || connectmode == conf_node::C_NEVER |
740 | && connectmode != conf_node::C_NEVER |
732 | || connectmode == conf_node::C_DISABLED) |
741 | && connectmode != conf_node::C_DISABLED |
733 | w.at = TSTAMP_CANCEL; |
742 | && NOW > w.at) |
734 | else if (w.at <= NOW) |
|
|
735 | { |
743 | { |
736 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
744 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
737 | |
745 | |
738 | if (retry_int < 3600 * 8) |
746 | double retry_int = double (retry_cnt & 3 |
739 | retry_cnt++; |
747 | ? (retry_cnt & 3) + 1 |
740 | |
748 | : 1 << (retry_cnt >> 2)); |
741 | w.at = NOW + retry_int; |
|
|
742 | |
749 | |
743 | reset_si (); |
750 | reset_si (); |
|
|
751 | |
|
|
752 | bool slow = si.prot & PROT_SLOW; |
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); |
747 | else |
756 | else |
748 | { |
757 | { |
749 | const sockinfo &dsi = forward_si (si); |
758 | const sockinfo &dsi = forward_si (si); |
|
|
759 | |
|
|
760 | slow = slow || (dsi.prot & PROT_SLOW); |
750 | |
761 | |
751 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
762 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
752 | { |
763 | { |
753 | if (retry_cnt < 4) |
764 | if (retry_cnt < 4) |
754 | send_auth_request (dsi, true); |
765 | send_auth_request (dsi, true); |
755 | else |
766 | else |
756 | send_ping (dsi, 0); |
767 | send_ping (dsi, 0); |
757 | } |
768 | } |
758 | } |
769 | } |
|
|
770 | |
|
|
771 | retry_int *= slow ? 8. : 0.7; |
|
|
772 | |
|
|
773 | if (retry_int < conf->max_retry) |
|
|
774 | retry_cnt++; |
|
|
775 | else |
|
|
776 | retry_int = conf->max_retry; |
|
|
777 | |
|
|
778 | w.start (NOW + retry_int); |
759 | } |
779 | } |
760 | } |
780 | } |
761 | |
781 | |
762 | void |
782 | void |
763 | connection::reset_connection () |
783 | connection::reset_connection () |
… | |
… | |
771 | run_script (run_script_cb (this, &connection::script_node_down), false); |
791 | run_script (run_script_cb (this, &connection::script_node_down), false); |
772 | } |
792 | } |
773 | |
793 | |
774 | delete ictx; ictx = 0; |
794 | delete ictx; ictx = 0; |
775 | delete octx; octx = 0; |
795 | delete octx; octx = 0; |
|
|
796 | #if ENABLE_DNS |
|
|
797 | dnsv4_reset_connection (); |
|
|
798 | #endif |
776 | |
799 | |
777 | si.host= 0; |
800 | si.host = 0; |
778 | |
801 | |
779 | last_activity = 0; |
802 | last_activity = 0; |
780 | retry_cnt = 0; |
803 | retry_cnt = 0; |
781 | |
804 | |
782 | rekey.reset (); |
805 | rekey.stop (); |
783 | keepalive.reset (); |
806 | keepalive.stop (); |
784 | establish_connection.reset (); |
807 | establish_connection.stop (); |
785 | } |
808 | } |
786 | |
809 | |
787 | void |
810 | void |
788 | connection::shutdown () |
811 | connection::shutdown () |
789 | { |
812 | { |
… | |
… | |
794 | } |
817 | } |
795 | |
818 | |
796 | void |
819 | void |
797 | connection::rekey_cb (time_watcher &w) |
820 | connection::rekey_cb (time_watcher &w) |
798 | { |
821 | { |
799 | w.at = TSTAMP_CANCEL; |
|
|
800 | |
|
|
801 | reset_connection (); |
822 | reset_connection (); |
802 | establish_connection (); |
823 | establish_connection (); |
803 | } |
824 | } |
804 | |
825 | |
805 | void |
826 | void |
… | |
… | |
839 | { |
860 | { |
840 | if (ictx && octx) |
861 | if (ictx && octx) |
841 | send_vpn_packet (pkt, si, tos); |
862 | send_vpn_packet (pkt, si, tos); |
842 | else |
863 | else |
843 | { |
864 | { |
844 | vpn_queue.put (new vpn_packet (*pkt)); |
865 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
845 | |
866 | |
846 | establish_connection (); |
867 | establish_connection (); |
847 | } |
868 | } |
848 | } |
869 | } |
849 | |
870 | |
… | |
… | |
908 | if (p->initiate) |
929 | if (p->initiate) |
909 | send_auth_request (rsi, false); |
930 | send_auth_request (rsi, false); |
910 | |
931 | |
911 | rsachallenge k; |
932 | rsachallenge k; |
912 | |
933 | |
913 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
934 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
914 | (unsigned char *)&p->encr, (unsigned char *)&k, |
|
|
915 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
916 | { |
935 | { |
917 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
936 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
918 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
937 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
919 | break; |
938 | break; |
920 | } |
939 | } |
… | |
… | |
924 | |
943 | |
925 | octx = new crypto_ctx (k, 1); |
944 | octx = new crypto_ctx (k, 1); |
926 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
945 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
927 | |
946 | |
928 | conf->protocols = p->protocols; |
947 | conf->protocols = p->protocols; |
|
|
948 | features = p->features & config_packet::get_features (); |
929 | |
949 | |
930 | send_auth_response (rsi, p->id, k); |
950 | send_auth_response (rsi, p->id, k); |
931 | |
951 | |
932 | connection_established (); |
952 | connection_established (); |
933 | |
953 | |
… | |
… | |
969 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
989 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
970 | |
990 | |
971 | if (!p->hmac_chk (cctx)) |
991 | if (!p->hmac_chk (cctx)) |
972 | { |
992 | { |
973 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
993 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
974 | "could be an attack, or just corruption or an synchronization error"), |
994 | "could be an attack, or just corruption or a synchronization error"), |
975 | conf->nodename, (const char *)rsi); |
995 | conf->nodename, (const char *)rsi); |
976 | break; |
996 | break; |
977 | } |
997 | } |
978 | else |
998 | else |
979 | { |
999 | { |
… | |
… | |
1028 | { |
1048 | { |
1029 | vpndata_packet *p = (vpndata_packet *)pkt; |
1049 | vpndata_packet *p = (vpndata_packet *)pkt; |
1030 | |
1050 | |
1031 | if (!p->hmac_chk (ictx)) |
1051 | if (!p->hmac_chk (ictx)) |
1032 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1052 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1033 | "could be an attack, or just corruption or an synchronization error"), |
1053 | "could be an attack, or just corruption or a synchronization error"), |
1034 | conf->nodename, (const char *)rsi); |
1054 | conf->nodename, (const char *)rsi); |
1035 | else |
1055 | else |
1036 | { |
1056 | { |
1037 | u32 seqno; |
1057 | u32 seqno; |
1038 | tap_packet *d = p->unpack (this, seqno); |
1058 | tap_packet *d = p->unpack (this, seqno); |
… | |
… | |
1047 | si = rsi; |
1067 | si = rsi; |
1048 | |
1068 | |
1049 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1069 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1050 | conf->nodename, (const char *)si, (const char *)rsi); |
1070 | conf->nodename, (const char *)si, (const char *)rsi); |
1051 | } |
1071 | } |
1052 | |
|
|
1053 | delete d; |
|
|
1054 | |
|
|
1055 | break; |
|
|
1056 | } |
1072 | } |
|
|
1073 | |
|
|
1074 | delete d; |
|
|
1075 | break; |
1057 | } |
1076 | } |
1058 | } |
1077 | } |
1059 | |
1078 | |
1060 | send_reset (rsi); |
1079 | send_reset (rsi); |
1061 | break; |
1080 | break; |
… | |
… | |
1086 | break; |
1105 | break; |
1087 | |
1106 | |
1088 | case vpn_packet::PT_CONNECT_INFO: |
1107 | case vpn_packet::PT_CONNECT_INFO: |
1089 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1108 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1090 | { |
1109 | { |
1091 | connect_info_packet *p = (connect_info_packet *) pkt; |
1110 | connect_info_packet *p = (connect_info_packet *)pkt; |
1092 | |
1111 | |
1093 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1112 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1094 | |
1113 | { |
1095 | connection *c = vpn->conns[p->id - 1]; |
1114 | connection *c = vpn->conns[p->id - 1]; |
1096 | |
1115 | |
1097 | c->conf->protocols = p->protocols; |
1116 | c->conf->protocols = p->protocols; |
1098 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1117 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1099 | p->si.upgrade_protocol (protocol, c->conf); |
1118 | p->si.upgrade_protocol (protocol, c->conf); |
1100 | |
1119 | |
1101 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1120 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1102 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1121 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1103 | |
1122 | |
1104 | const sockinfo &dsi = forward_si (p->si); |
1123 | const sockinfo &dsi = forward_si (p->si); |
1105 | |
1124 | |
1106 | if (dsi.valid ()) |
1125 | if (dsi.valid ()) |
1107 | c->send_auth_request (dsi, true); |
1126 | c->send_auth_request (dsi, true); |
|
|
1127 | } |
1108 | } |
1128 | } |
1109 | |
1129 | |
1110 | break; |
1130 | break; |
1111 | |
1131 | |
1112 | default: |
1132 | default: |
… | |
… | |
1121 | { |
1141 | { |
1122 | reset_connection (); |
1142 | reset_connection (); |
1123 | establish_connection (); |
1143 | establish_connection (); |
1124 | } |
1144 | } |
1125 | else if (NOW < last_activity + ::conf.keepalive) |
1145 | else if (NOW < last_activity + ::conf.keepalive) |
1126 | w.at = last_activity + ::conf.keepalive; |
1146 | w.start (last_activity + ::conf.keepalive); |
1127 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1147 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1128 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1148 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1129 | { |
1149 | { |
1130 | send_ping (si); |
1150 | send_ping (si); |
1131 | w.at = NOW + 5; |
1151 | w.start (NOW + 5); |
1132 | } |
1152 | } |
1133 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1153 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1134 | // hold ondemand connections implicitly a few seconds longer |
1154 | // hold ondemand connections implicitly a few seconds longer |
1135 | // should delete octx, though, or something like that ;) |
1155 | // should delete octx, though, or something like that ;) |
1136 | w.at = last_activity + ::conf.keepalive + 10; |
1156 | w.start (last_activity + ::conf.keepalive + 10); |
1137 | else |
1157 | else |
1138 | reset_connection (); |
1158 | reset_connection (); |
1139 | } |
1159 | } |
1140 | |
1160 | |
1141 | void connection::send_connect_request (int id) |
1161 | void connection::send_connect_request (int id) |
… | |
… | |
1176 | putenv ("STATE=down"); |
1196 | putenv ("STATE=down"); |
1177 | |
1197 | |
1178 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1198 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1179 | } |
1199 | } |
1180 | |
1200 | |
1181 | connection::connection(struct vpn *vpn_) |
1201 | connection::connection (struct vpn *vpn, conf_node *conf) |
1182 | : vpn(vpn_) |
1202 | : vpn(vpn), conf(conf) |
1183 | , rekey (this, &connection::rekey_cb) |
1203 | , rekey (this, &connection::rekey_cb) |
1184 | , keepalive (this, &connection::keepalive_cb) |
1204 | , keepalive (this, &connection::keepalive_cb) |
1185 | , establish_connection (this, &connection::establish_connection_cb) |
1205 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1206 | #if ENABLE_DNS |
|
|
1207 | , dns (0) |
|
|
1208 | #endif |
1186 | { |
1209 | { |
1187 | octx = ictx = 0; |
1210 | octx = ictx = 0; |
1188 | retry_cnt = 0; |
1211 | retry_cnt = 0; |
1189 | |
1212 | |
|
|
1213 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1214 | conf->protocols = PROT_UDPv4; |
|
|
1215 | |
1190 | connectmode = conf_node::C_ALWAYS; // initial setting |
1216 | connectmode = conf_node::C_ALWAYS; // initial setting |
1191 | reset_connection (); |
1217 | reset_connection (); |
1192 | } |
1218 | } |
1193 | |
1219 | |
1194 | connection::~connection () |
1220 | connection::~connection () |