1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
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3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "config.h" |
20 | |
23 | |
21 | extern "C" { |
24 | #include <cassert> |
22 | # include "lzf/lzf.h" |
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23 | } |
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24 | |
25 | |
25 | #include <list> |
26 | #include <list> |
26 | |
27 | |
27 | #include <openssl/rand.h> |
28 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
29 | #include <openssl/evp.h> |
… | |
… | |
43 | # define RAND_pseudo_bytes RAND_bytes |
44 | # define RAND_pseudo_bytes RAND_bytes |
44 | #endif |
45 | #endif |
45 | |
46 | |
46 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
47 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
47 | |
48 | |
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49 | #define ULTRA_FAST 1 |
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50 | #define HLOG 15 |
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51 | #include "lzf/lzf.h" |
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52 | #include "lzf/lzf_c.c" |
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53 | #include "lzf/lzf_d.c" |
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54 | |
48 | struct crypto_ctx |
55 | struct crypto_ctx |
49 | { |
56 | { |
50 | EVP_CIPHER_CTX cctx; |
57 | EVP_CIPHER_CTX cctx; |
51 | HMAC_CTX hctx; |
58 | HMAC_CTX hctx; |
52 | |
59 | |
… | |
… | |
55 | }; |
62 | }; |
56 | |
63 | |
57 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
64 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
58 | { |
65 | { |
59 | EVP_CIPHER_CTX_init (&cctx); |
66 | EVP_CIPHER_CTX_init (&cctx); |
60 | 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)); |
61 | HMAC_CTX_init (&hctx); |
68 | HMAC_CTX_init (&hctx); |
62 | 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); |
63 | } |
70 | } |
64 | |
71 | |
65 | crypto_ctx::~crypto_ctx () |
72 | crypto_ctx::~crypto_ctx () |
66 | { |
73 | { |
67 | EVP_CIPHER_CTX_cleanup (&cctx); |
74 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
68 | HMAC_CTX_cleanup (&hctx); |
75 | HMAC_CTX_cleanup (&hctx); |
69 | } |
76 | } |
70 | |
77 | |
71 | static void |
78 | static void |
72 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
79 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
73 | { |
80 | { |
74 | EVP_MD_CTX ctx; |
81 | EVP_MD_CTX ctx; |
75 | |
82 | |
76 | EVP_MD_CTX_init (&ctx); |
83 | EVP_MD_CTX_init (&ctx); |
77 | EVP_DigestInit (&ctx, RSA_HASH); |
84 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
78 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
85 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
79 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
86 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
80 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
87 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
81 | EVP_MD_CTX_cleanup (&ctx); |
88 | EVP_MD_CTX_cleanup (&ctx); |
82 | } |
89 | } |
83 | |
90 | |
84 | struct rsa_entry { |
91 | struct rsa_entry { |
85 | tstamp expire; |
92 | tstamp expire; |
… | |
… | |
133 | |
140 | |
134 | } rsa_cache; |
141 | } rsa_cache; |
135 | |
142 | |
136 | void rsa_cache::cleaner_cb (time_watcher &w) |
143 | void rsa_cache::cleaner_cb (time_watcher &w) |
137 | { |
144 | { |
138 | if (empty ()) |
145 | if (!empty ()) |
139 | w.at = TSTAMP_CANCEL; |
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140 | else |
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141 | { |
146 | { |
142 | w.at = NOW + RSA_TTL; |
147 | w.start (NOW + RSA_TTL); |
143 | |
148 | |
144 | for (iterator i = begin (); i != end (); ) |
149 | for (iterator i = begin (); i != end (); ) |
145 | if (i->expire <= NOW) |
150 | if (i->expire <= NOW) |
146 | i = erase (i); |
151 | i = erase (i); |
147 | else |
152 | else |
… | |
… | |
199 | // 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. |
200 | // this implementation ("splay list" ;) is inefficient, |
205 | // this implementation ("splay list" ;) is inefficient, |
201 | // but low on resources. |
206 | // but low on resources. |
202 | struct net_rate_limiter : list<net_rateinfo> |
207 | struct net_rate_limiter : list<net_rateinfo> |
203 | { |
208 | { |
204 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
209 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
205 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
210 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
206 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
211 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
207 | 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 |
208 | |
213 | |
209 | bool can (const sockinfo &si) { return can((u32)si.host); } |
214 | bool can (const sockinfo &si) { return can((u32)si.host); } |
210 | bool can (u32 host); |
215 | bool can (u32 host); |
211 | }; |
216 | }; |
212 | |
217 | |
… | |
… | |
217 | iterator i; |
222 | iterator i; |
218 | |
223 | |
219 | for (i = begin (); i != end (); ) |
224 | for (i = begin (); i != end (); ) |
220 | if (i->host == host) |
225 | if (i->host == host) |
221 | break; |
226 | break; |
222 | else if (i->last < NOW - EXPIRE) |
227 | else if (i->last < NOW - NRL_EXPIRE) |
223 | i = erase (i); |
228 | i = erase (i); |
224 | else |
229 | else |
225 | i++; |
230 | i++; |
226 | |
231 | |
227 | if (i == end ()) |
232 | if (i == end ()) |
228 | { |
233 | { |
229 | net_rateinfo ri; |
234 | net_rateinfo ri; |
230 | |
235 | |
231 | ri.host = host; |
236 | ri.host = host; |
232 | ri.pcnt = 1.; |
237 | ri.pcnt = 1.; |
233 | ri.diff = MAXDIF; |
238 | ri.diff = NRL_MAXDIF; |
234 | ri.last = NOW; |
239 | ri.last = NOW; |
235 | |
240 | |
236 | push_front (ri); |
241 | push_front (ri); |
237 | |
242 | |
238 | return true; |
243 | return true; |
… | |
… | |
240 | else |
245 | else |
241 | { |
246 | { |
242 | net_rateinfo ri (*i); |
247 | net_rateinfo ri (*i); |
243 | erase (i); |
248 | erase (i); |
244 | |
249 | |
245 | ri.pcnt = ri.pcnt * ALPHA; |
250 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
246 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
251 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
247 | |
252 | |
248 | ri.last = NOW; |
253 | ri.last = NOW; |
249 | |
254 | |
250 | double dif = ri.diff / ri.pcnt; |
255 | double dif = ri.diff / ri.pcnt; |
251 | |
256 | |
252 | bool send = dif > CUTOFF; |
257 | bool send = dif > NRL_CUTOFF; |
253 | |
258 | |
254 | if (dif > MAXDIF) |
259 | if (dif > NRL_MAXDIF) |
255 | { |
260 | { |
256 | ri.pcnt = 1.; |
261 | ri.pcnt = 1.; |
257 | ri.diff = MAXDIF; |
262 | ri.diff = NRL_MAXDIF; |
258 | } |
263 | } |
259 | else if (send) |
264 | else if (send) |
260 | ri.pcnt++; |
265 | ri.pcnt++; |
261 | |
266 | |
262 | push_front (ri); |
267 | push_front (ri); |
… | |
… | |
309 | } |
314 | } |
310 | |
315 | |
311 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
316 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
312 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
317 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
313 | |
318 | |
314 | struct vpndata_packet:vpn_packet |
319 | struct vpndata_packet : vpn_packet |
315 | { |
320 | { |
316 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
321 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
317 | |
322 | |
318 | 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); |
319 | tap_packet *unpack (connection *conn, u32 &seqno); |
324 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
332 | int outl = 0, outl2; |
337 | int outl = 0, outl2; |
333 | ptype type = PT_DATA_UNCOMPRESSED; |
338 | ptype type = PT_DATA_UNCOMPRESSED; |
334 | |
339 | |
335 | #if ENABLE_COMPRESSION |
340 | #if ENABLE_COMPRESSION |
336 | u8 cdata[MAX_MTU]; |
341 | u8 cdata[MAX_MTU]; |
337 | u32 cl; |
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338 | |
342 | |
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343 | if (conn->features & ENABLE_COMPRESSION) |
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344 | { |
339 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
345 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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346 | |
340 | if (cl) |
347 | if (cl) |
341 | { |
348 | { |
342 | type = PT_DATA_COMPRESSED; |
349 | type = PT_DATA_COMPRESSED; |
343 | d = cdata; |
350 | d = cdata; |
344 | l = cl + 2; |
351 | l = cl + 2; |
345 | |
352 | |
346 | d[0] = cl >> 8; |
353 | d[0] = cl >> 8; |
347 | d[1] = cl; |
354 | d[1] = cl; |
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355 | } |
348 | } |
356 | } |
349 | #endif |
357 | #endif |
350 | |
358 | |
351 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
359 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
352 | |
360 | |
353 | struct { |
361 | struct { |
354 | #if RAND_SIZE |
362 | #if RAND_SIZE |
355 | u8 rnd[RAND_SIZE]; |
363 | u8 rnd[RAND_SIZE]; |
356 | #endif |
364 | #endif |
… | |
… | |
360 | datahdr.seqno = ntohl (seqno); |
368 | datahdr.seqno = ntohl (seqno); |
361 | #if RAND_SIZE |
369 | #if RAND_SIZE |
362 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
370 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
363 | #endif |
371 | #endif |
364 | |
372 | |
365 | EVP_EncryptUpdate (cctx, |
373 | require (EVP_EncryptUpdate (cctx, |
366 | (unsigned char *) data + outl, &outl2, |
374 | (unsigned char *) data + outl, &outl2, |
367 | (unsigned char *) &datahdr, DATAHDR); |
375 | (unsigned char *) &datahdr, DATAHDR)); |
368 | outl += outl2; |
376 | outl += outl2; |
369 | |
377 | |
370 | EVP_EncryptUpdate (cctx, |
378 | require (EVP_EncryptUpdate (cctx, |
371 | (unsigned char *) data + outl, &outl2, |
379 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) d, l); |
380 | (unsigned char *) d, l)); |
373 | outl += outl2; |
381 | outl += outl2; |
374 | |
382 | |
375 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
383 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
376 | outl += outl2; |
384 | outl += outl2; |
377 | |
385 | |
378 | len = outl + data_hdr_size (); |
386 | len = outl + data_hdr_size (); |
379 | |
387 | |
380 | set_hdr (type, dst); |
388 | set_hdr (type, dst); |
… | |
… | |
389 | int outl = 0, outl2; |
397 | int outl = 0, outl2; |
390 | tap_packet *p = new tap_packet; |
398 | tap_packet *p = new tap_packet; |
391 | u8 *d; |
399 | u8 *d; |
392 | u32 l = len - data_hdr_size (); |
400 | u32 l = len - data_hdr_size (); |
393 | |
401 | |
394 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
402 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
395 | |
403 | |
396 | #if ENABLE_COMPRESSION |
404 | #if ENABLE_COMPRESSION |
397 | u8 cdata[MAX_MTU]; |
405 | u8 cdata[MAX_MTU]; |
398 | |
406 | |
399 | if (type == PT_DATA_COMPRESSED) |
407 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
401 | else |
409 | else |
402 | #endif |
410 | #endif |
403 | d = &(*p)[6 + 6 - DATAHDR]; |
411 | d = &(*p)[6 + 6 - DATAHDR]; |
404 | |
412 | |
405 | /* 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 */ |
406 | EVP_DecryptUpdate (cctx, |
414 | require (EVP_DecryptUpdate (cctx, |
407 | d, &outl2, |
415 | d, &outl2, |
408 | (unsigned char *)&data, len - data_hdr_size ()); |
416 | (unsigned char *)&data, len - data_hdr_size ())); |
409 | outl += outl2; |
417 | outl += outl2; |
410 | |
418 | |
411 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
419 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
412 | outl += outl2; |
420 | outl += outl2; |
413 | |
421 | |
414 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
422 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
415 | |
423 | |
416 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
424 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
445 | { |
453 | { |
446 | // actually, hmaclen cannot be checked because the hmac |
454 | // actually, hmaclen cannot be checked because the hmac |
447 | // field comes before this data, so peers with other |
455 | // field comes before this data, so peers with other |
448 | // hmacs simply will not work. |
456 | // hmacs simply will not work. |
449 | u8 prot_major, prot_minor, randsize, hmaclen; |
457 | u8 prot_major, prot_minor, randsize, hmaclen; |
450 | u8 flags, challengelen, pad2, pad3; |
458 | u8 flags, challengelen, features, pad3; |
451 | u32 cipher_nid, digest_nid, hmac_nid; |
459 | u32 cipher_nid, digest_nid, hmac_nid; |
452 | |
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453 | const u8 curflags () const |
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454 | { |
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455 | return 0x80 |
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456 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
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457 | } |
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458 | |
460 | |
459 | void setup (ptype type, int dst); |
461 | void setup (ptype type, int dst); |
460 | bool chk_config () const; |
462 | bool chk_config () const; |
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463 | |
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464 | static u8 get_features () |
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465 | { |
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466 | u8 f = 0; |
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467 | #if ENABLE_COMPRESSION |
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468 | f |= FEATURE_COMPRESSION; |
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469 | #endif |
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470 | #if ENABLE_ROHC |
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471 | f |= FEATURE_ROHC; |
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472 | #endif |
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473 | return f; |
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474 | } |
461 | }; |
475 | }; |
462 | |
476 | |
463 | void config_packet::setup (ptype type, int dst) |
477 | void config_packet::setup (ptype type, int dst) |
464 | { |
478 | { |
465 | prot_major = PROTOCOL_MAJOR; |
479 | prot_major = PROTOCOL_MAJOR; |
466 | prot_minor = PROTOCOL_MINOR; |
480 | prot_minor = PROTOCOL_MINOR; |
467 | randsize = RAND_SIZE; |
481 | randsize = RAND_SIZE; |
468 | hmaclen = HMACLENGTH; |
482 | hmaclen = HMACLENGTH; |
469 | flags = curflags (); |
483 | flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
470 | challengelen = sizeof (rsachallenge); |
484 | challengelen = sizeof (rsachallenge); |
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485 | features = get_features (); |
471 | |
486 | |
472 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
487 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
473 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
488 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
474 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
489 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
475 | |
490 | |
… | |
… | |
478 | } |
493 | } |
479 | |
494 | |
480 | bool config_packet::chk_config () const |
495 | bool config_packet::chk_config () const |
481 | { |
496 | { |
482 | if (prot_major != PROTOCOL_MAJOR) |
497 | if (prot_major != PROTOCOL_MAJOR) |
483 | 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); |
484 | else if (randsize != RAND_SIZE) |
499 | else if (randsize != RAND_SIZE) |
485 | 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); |
486 | else if (hmaclen != HMACLENGTH) |
501 | else if (hmaclen != HMACLENGTH) |
487 | slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
502 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
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|
503 | #if 0 // this implementation should handle all flag settings |
488 | else if (flags != curflags ()) |
504 | else if (flags != curflags ()) |
489 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
505 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
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506 | #endif |
490 | else if (challengelen != sizeof (rsachallenge)) |
507 | else if (challengelen != sizeof (rsachallenge)) |
491 | 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)); |
492 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
509 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
493 | 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)); |
494 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
511 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
495 | 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)); |
496 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
513 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
497 | 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)); |
498 | else |
515 | else |
499 | return true; |
516 | return true; |
500 | |
517 | |
501 | return false; |
518 | return false; |
502 | } |
519 | } |
503 | |
520 | |
504 | struct auth_req_packet : config_packet |
521 | struct auth_req_packet : config_packet |
505 | { |
522 | { |
506 | char magic[8]; |
523 | char magic[8]; |
507 | u8 initiate; // false if this is just an automatic reply |
524 | u8 initiate; // false if this is just an automatic reply |
508 | u8 protocols; // supported protocols (will get patches on forward) |
525 | u8 protocols; // supported protocols (will be patched on forward) |
509 | u8 pad2, pad3; |
526 | u8 pad2, pad3; |
510 | rsaid id; |
527 | rsaid id; |
511 | rsaencrdata encr; |
528 | rsaencrdata encr; |
512 | |
529 | |
513 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
530 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
574 | { |
591 | { |
575 | if (ictx && octx) |
592 | if (ictx && octx) |
576 | { |
593 | { |
577 | connectmode = conf->connectmode; |
594 | connectmode = conf->connectmode; |
578 | |
595 | |
|
|
596 | // make sure rekeying timeouts are slightly asymmetric |
579 | rekey.start (NOW + ::conf.rekey); |
597 | rekey.start (NOW + ::conf.rekey |
|
|
598 | + (conf->id > THISNODE->id ? 10 : 0)); |
580 | keepalive.start (NOW + ::conf.keepalive); |
599 | keepalive.start (NOW + ::conf.keepalive); |
581 | |
600 | |
582 | // send queued packets |
601 | // send queued packets |
583 | if (ictx && octx) |
602 | if (ictx && octx) |
584 | { |
603 | { |
… | |
… | |
597 | } |
616 | } |
598 | else |
617 | else |
599 | { |
618 | { |
600 | retry_cnt = 0; |
619 | retry_cnt = 0; |
601 | establish_connection.start (NOW + 5); |
620 | establish_connection.start (NOW + 5); |
602 | keepalive.reset (); |
621 | keepalive.stop (); |
603 | rekey.reset (); |
622 | rekey.stop (); |
604 | } |
623 | } |
605 | } |
624 | } |
606 | |
625 | |
607 | void |
626 | void |
608 | connection::reset_si () |
627 | connection::reset_si () |
… | |
… | |
610 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
629 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
611 | |
630 | |
612 | // mask out protocols we cannot establish |
631 | // mask out protocols we cannot establish |
613 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
632 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
614 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
633 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
634 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
615 | |
635 | |
616 | si.set (conf, protocol); |
636 | si.set (conf, protocol); |
617 | } |
637 | } |
618 | |
638 | |
619 | // ensure sockinfo is valid, forward if necessary |
639 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
639 | } |
659 | } |
640 | |
660 | |
641 | void |
661 | void |
642 | 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) |
643 | { |
663 | { |
644 | 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) |
645 | reset_connection (); |
691 | reset_connection (); |
646 | } |
692 | } |
647 | |
693 | |
648 | void |
694 | void |
649 | connection::send_ping (const sockinfo &si, u8 pong) |
695 | connection::send_ping (const sockinfo &si, u8 pong) |
… | |
… | |
674 | connection::send_auth_request (const sockinfo &si, bool initiate) |
720 | connection::send_auth_request (const sockinfo &si, bool initiate) |
675 | { |
721 | { |
676 | 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); |
677 | |
723 | |
678 | rsachallenge chg; |
724 | rsachallenge chg; |
679 | |
|
|
680 | rsa_cache.gen (pkt->id, chg); |
725 | rsa_cache.gen (pkt->id, chg); |
681 | |
726 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
682 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
683 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
684 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
685 | fatal ("RSA_public_encrypt error"); |
|
|
686 | |
727 | |
687 | 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); |
688 | |
729 | |
689 | 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 |
690 | |
731 | |
… | |
… | |
724 | } |
765 | } |
725 | |
766 | |
726 | void |
767 | void |
727 | connection::establish_connection_cb (time_watcher &w) |
768 | connection::establish_connection_cb (time_watcher &w) |
728 | { |
769 | { |
729 | if (ictx || conf == THISNODE |
770 | if (!ictx |
|
|
771 | && conf != THISNODE |
730 | || connectmode == conf_node::C_NEVER |
772 | && connectmode != conf_node::C_NEVER |
731 | || connectmode == conf_node::C_DISABLED) |
773 | && connectmode != conf_node::C_DISABLED |
732 | w.at = TSTAMP_CANCEL; |
774 | && NOW > w.at) |
733 | else if (w.at <= NOW) |
|
|
734 | { |
775 | { |
735 | 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; |
736 | |
777 | |
737 | if (retry_int < 3600 * 8) |
778 | if (retry_int < conf->max_retry) |
738 | retry_cnt++; |
779 | retry_cnt++; |
|
|
780 | else |
|
|
781 | retry_int = conf->max_retry; |
739 | |
782 | |
740 | w.at = NOW + retry_int; |
783 | w.start (NOW + retry_int); |
741 | |
784 | |
742 | reset_si (); |
785 | reset_si (); |
743 | |
786 | |
744 | if (si.prot && !si.host) |
787 | if (si.prot && !si.host) |
745 | vpn->send_connect_request (conf->id); |
788 | vpn->send_connect_request (conf->id); |
… | |
… | |
770 | run_script (run_script_cb (this, &connection::script_node_down), false); |
813 | run_script (run_script_cb (this, &connection::script_node_down), false); |
771 | } |
814 | } |
772 | |
815 | |
773 | delete ictx; ictx = 0; |
816 | delete ictx; ictx = 0; |
774 | delete octx; octx = 0; |
817 | delete octx; octx = 0; |
|
|
818 | #if ENABLE_DNS |
|
|
819 | dnsv4_reset_connection (); |
|
|
820 | #endif |
775 | |
821 | |
776 | si.host= 0; |
822 | si.host = 0; |
777 | |
823 | |
778 | last_activity = 0; |
824 | last_activity = 0; |
779 | retry_cnt = 0; |
825 | retry_cnt = 0; |
780 | |
826 | |
781 | rekey.reset (); |
827 | rekey.stop (); |
782 | keepalive.reset (); |
828 | keepalive.stop (); |
783 | establish_connection.reset (); |
829 | establish_connection.stop (); |
784 | } |
830 | } |
785 | |
831 | |
786 | void |
832 | void |
787 | connection::shutdown () |
833 | connection::shutdown () |
788 | { |
834 | { |
… | |
… | |
793 | } |
839 | } |
794 | |
840 | |
795 | void |
841 | void |
796 | connection::rekey_cb (time_watcher &w) |
842 | connection::rekey_cb (time_watcher &w) |
797 | { |
843 | { |
798 | w.at = TSTAMP_CANCEL; |
|
|
799 | |
|
|
800 | reset_connection (); |
844 | reset_connection (); |
801 | establish_connection (); |
845 | establish_connection (); |
802 | } |
846 | } |
803 | |
847 | |
804 | void |
848 | void |
… | |
… | |
838 | { |
882 | { |
839 | if (ictx && octx) |
883 | if (ictx && octx) |
840 | send_vpn_packet (pkt, si, tos); |
884 | send_vpn_packet (pkt, si, tos); |
841 | else |
885 | else |
842 | { |
886 | { |
843 | vpn_queue.put (new vpn_packet (*pkt)); |
887 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
844 | |
888 | |
845 | establish_connection (); |
889 | establish_connection (); |
846 | } |
890 | } |
847 | } |
891 | } |
848 | |
892 | |
… | |
… | |
907 | if (p->initiate) |
951 | if (p->initiate) |
908 | send_auth_request (rsi, false); |
952 | send_auth_request (rsi, false); |
909 | |
953 | |
910 | rsachallenge k; |
954 | rsachallenge k; |
911 | |
955 | |
912 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
956 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
913 | (unsigned char *)&p->encr, (unsigned char *)&k, |
957 | { |
914 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
915 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
958 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
916 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
959 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
960 | break; |
|
|
961 | } |
917 | else |
962 | else |
918 | { |
963 | { |
919 | delete octx; |
964 | delete octx; |
920 | |
965 | |
921 | octx = new crypto_ctx (k, 1); |
966 | octx = new crypto_ctx (k, 1); |
922 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
967 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
923 | |
968 | |
|
|
969 | // compatibility code, remove when no longer required |
|
|
970 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
971 | |
924 | conf->protocols = p->protocols; |
972 | conf->protocols = p->protocols; |
|
|
973 | features = p->features & config_packet::get_features (); |
925 | |
974 | |
926 | send_auth_response (rsi, p->id, k); |
975 | send_auth_response (rsi, p->id, k); |
927 | |
976 | |
928 | connection_established (); |
977 | connection_established (); |
929 | |
978 | |
… | |
… | |
965 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1014 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
966 | |
1015 | |
967 | if (!p->hmac_chk (cctx)) |
1016 | if (!p->hmac_chk (cctx)) |
968 | { |
1017 | { |
969 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1018 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
970 | "could be an attack, or just corruption or an synchronization error"), |
1019 | "could be an attack, or just corruption or a synchronization error"), |
971 | conf->nodename, (const char *)rsi); |
1020 | conf->nodename, (const char *)rsi); |
972 | break; |
1021 | break; |
973 | } |
1022 | } |
974 | else |
1023 | else |
975 | { |
1024 | { |
… | |
… | |
1024 | { |
1073 | { |
1025 | vpndata_packet *p = (vpndata_packet *)pkt; |
1074 | vpndata_packet *p = (vpndata_packet *)pkt; |
1026 | |
1075 | |
1027 | if (!p->hmac_chk (ictx)) |
1076 | if (!p->hmac_chk (ictx)) |
1028 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1077 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1029 | "could be an attack, or just corruption or an synchronization error"), |
1078 | "could be an attack, or just corruption or a synchronization error"), |
1030 | conf->nodename, (const char *)rsi); |
1079 | conf->nodename, (const char *)rsi); |
1031 | else |
1080 | else |
1032 | { |
1081 | { |
1033 | u32 seqno; |
1082 | u32 seqno; |
1034 | tap_packet *d = p->unpack (this, seqno); |
1083 | tap_packet *d = p->unpack (this, seqno); |
… | |
… | |
1043 | si = rsi; |
1092 | si = rsi; |
1044 | |
1093 | |
1045 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1094 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1046 | conf->nodename, (const char *)si, (const char *)rsi); |
1095 | conf->nodename, (const char *)si, (const char *)rsi); |
1047 | } |
1096 | } |
1048 | |
|
|
1049 | delete d; |
|
|
1050 | |
|
|
1051 | break; |
|
|
1052 | } |
1097 | } |
|
|
1098 | |
|
|
1099 | delete d; |
|
|
1100 | break; |
1053 | } |
1101 | } |
1054 | } |
1102 | } |
1055 | |
1103 | |
1056 | send_reset (rsi); |
1104 | send_reset (rsi); |
1057 | break; |
1105 | break; |
… | |
… | |
1082 | break; |
1130 | break; |
1083 | |
1131 | |
1084 | case vpn_packet::PT_CONNECT_INFO: |
1132 | case vpn_packet::PT_CONNECT_INFO: |
1085 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1133 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1086 | { |
1134 | { |
1087 | connect_info_packet *p = (connect_info_packet *) pkt; |
1135 | connect_info_packet *p = (connect_info_packet *)pkt; |
1088 | |
1136 | |
1089 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1137 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1090 | |
1138 | { |
1091 | connection *c = vpn->conns[p->id - 1]; |
1139 | connection *c = vpn->conns[p->id - 1]; |
1092 | |
1140 | |
1093 | c->conf->protocols = p->protocols; |
1141 | c->conf->protocols = p->protocols; |
1094 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1142 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1095 | p->si.upgrade_protocol (protocol, c->conf); |
1143 | p->si.upgrade_protocol (protocol, c->conf); |
1096 | |
1144 | |
1097 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1145 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1098 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1146 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1099 | |
1147 | |
1100 | const sockinfo &dsi = forward_si (p->si); |
1148 | const sockinfo &dsi = forward_si (p->si); |
1101 | |
1149 | |
1102 | if (dsi.valid ()) |
1150 | if (dsi.valid ()) |
1103 | c->send_auth_request (dsi, true); |
1151 | c->send_auth_request (dsi, true); |
|
|
1152 | } |
1104 | } |
1153 | } |
1105 | |
1154 | |
1106 | break; |
1155 | break; |
1107 | |
1156 | |
1108 | default: |
1157 | default: |
… | |
… | |
1117 | { |
1166 | { |
1118 | reset_connection (); |
1167 | reset_connection (); |
1119 | establish_connection (); |
1168 | establish_connection (); |
1120 | } |
1169 | } |
1121 | else if (NOW < last_activity + ::conf.keepalive) |
1170 | else if (NOW < last_activity + ::conf.keepalive) |
1122 | w.at = last_activity + ::conf.keepalive; |
1171 | w.start (last_activity + ::conf.keepalive); |
1123 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1172 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1124 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1173 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1125 | { |
1174 | { |
1126 | send_ping (si); |
1175 | send_ping (si); |
1127 | w.at = NOW + 5; |
1176 | w.start (NOW + 5); |
1128 | } |
1177 | } |
1129 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1178 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1130 | // hold ondemand connections implicitly a few seconds longer |
1179 | // hold ondemand connections implicitly a few seconds longer |
1131 | // should delete octx, though, or something like that ;) |
1180 | // should delete octx, though, or something like that ;) |
1132 | w.at = last_activity + ::conf.keepalive + 10; |
1181 | w.start (last_activity + ::conf.keepalive + 10); |
1133 | else |
1182 | else |
1134 | reset_connection (); |
1183 | reset_connection (); |
1135 | } |
1184 | } |
1136 | |
1185 | |
1137 | void connection::send_connect_request (int id) |
1186 | void connection::send_connect_request (int id) |
… | |
… | |
1172 | putenv ("STATE=down"); |
1221 | putenv ("STATE=down"); |
1173 | |
1222 | |
1174 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1223 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1175 | } |
1224 | } |
1176 | |
1225 | |
1177 | connection::connection(struct vpn *vpn_) |
1226 | connection::connection (struct vpn *vpn, conf_node *conf) |
1178 | : vpn(vpn_) |
1227 | : vpn(vpn), conf(conf) |
1179 | , rekey (this, &connection::rekey_cb) |
1228 | , rekey (this, &connection::rekey_cb) |
1180 | , keepalive (this, &connection::keepalive_cb) |
1229 | , keepalive (this, &connection::keepalive_cb) |
1181 | , establish_connection (this, &connection::establish_connection_cb) |
1230 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1231 | #if ENABLE_DNS |
|
|
1232 | , dns (0) |
|
|
1233 | #endif |
1182 | { |
1234 | { |
1183 | octx = ictx = 0; |
1235 | octx = ictx = 0; |
1184 | retry_cnt = 0; |
1236 | retry_cnt = 0; |
1185 | |
1237 | |
|
|
1238 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1239 | conf->protocols = PROT_UDPv4; |
|
|
1240 | |
1186 | connectmode = conf_node::C_ALWAYS; // initial setting |
1241 | connectmode = conf_node::C_ALWAYS; // initial setting |
1187 | reset_connection (); |
1242 | reset_connection (); |
1188 | } |
1243 | } |
1189 | |
1244 | |
1190 | connection::~connection () |
1245 | connection::~connection () |