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> |
… | |
… | |
35 | #include "slog.h" |
36 | #include "slog.h" |
36 | #include "device.h" |
37 | #include "device.h" |
37 | #include "vpn.h" |
38 | #include "vpn.h" |
38 | #include "connection.h" |
39 | #include "connection.h" |
39 | |
40 | |
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41 | #include "netcompat.h" |
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42 | |
40 | #if !HAVE_RAND_PSEUDO_BYTES |
43 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | # define RAND_pseudo_bytes RAND_bytes |
44 | # define RAND_pseudo_bytes RAND_bytes |
42 | #endif |
45 | #endif |
43 | |
46 | |
44 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
47 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | |
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 | |
46 | struct crypto_ctx |
55 | struct crypto_ctx |
47 | { |
56 | { |
48 | EVP_CIPHER_CTX cctx; |
57 | EVP_CIPHER_CTX cctx; |
49 | HMAC_CTX hctx; |
58 | HMAC_CTX hctx; |
50 | |
59 | |
… | |
… | |
53 | }; |
62 | }; |
54 | |
63 | |
55 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
64 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
56 | { |
65 | { |
57 | EVP_CIPHER_CTX_init (&cctx); |
66 | EVP_CIPHER_CTX_init (&cctx); |
58 | 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)); |
59 | HMAC_CTX_init (&hctx); |
68 | HMAC_CTX_init (&hctx); |
60 | 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); |
61 | } |
70 | } |
62 | |
71 | |
63 | crypto_ctx::~crypto_ctx () |
72 | crypto_ctx::~crypto_ctx () |
64 | { |
73 | { |
65 | EVP_CIPHER_CTX_cleanup (&cctx); |
74 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
66 | HMAC_CTX_cleanup (&hctx); |
75 | HMAC_CTX_cleanup (&hctx); |
67 | } |
76 | } |
68 | |
77 | |
69 | static void |
78 | static void |
70 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
79 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
71 | { |
80 | { |
72 | EVP_MD_CTX ctx; |
81 | EVP_MD_CTX ctx; |
73 | |
82 | |
74 | EVP_MD_CTX_init (&ctx); |
83 | EVP_MD_CTX_init (&ctx); |
75 | EVP_DigestInit (&ctx, RSA_HASH); |
84 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
76 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
85 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
77 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
86 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
78 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
87 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
79 | EVP_MD_CTX_cleanup (&ctx); |
88 | EVP_MD_CTX_cleanup (&ctx); |
80 | } |
89 | } |
81 | |
90 | |
82 | struct rsa_entry { |
91 | struct rsa_entry { |
83 | tstamp expire; |
92 | tstamp expire; |
… | |
… | |
131 | |
140 | |
132 | } rsa_cache; |
141 | } rsa_cache; |
133 | |
142 | |
134 | void rsa_cache::cleaner_cb (time_watcher &w) |
143 | void rsa_cache::cleaner_cb (time_watcher &w) |
135 | { |
144 | { |
136 | if (empty ()) |
145 | if (!empty ()) |
137 | w.at = TSTAMP_CANCEL; |
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138 | else |
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139 | { |
146 | { |
140 | w.at = NOW + RSA_TTL; |
147 | w.start (NOW + RSA_TTL); |
141 | |
148 | |
142 | for (iterator i = begin (); i != end (); ) |
149 | for (iterator i = begin (); i != end (); ) |
143 | if (i->expire <= NOW) |
150 | if (i->expire <= NOW) |
144 | i = erase (i); |
151 | i = erase (i); |
145 | else |
152 | else |
… | |
… | |
147 | } |
154 | } |
148 | } |
155 | } |
149 | |
156 | |
150 | ////////////////////////////////////////////////////////////////////////////// |
157 | ////////////////////////////////////////////////////////////////////////////// |
151 | |
158 | |
152 | void pkt_queue::put (tap_packet *p) |
159 | void pkt_queue::put (net_packet *p) |
153 | { |
160 | { |
154 | if (queue[i]) |
161 | if (queue[i]) |
155 | { |
162 | { |
156 | delete queue[i]; |
163 | delete queue[i]; |
157 | j = (j + 1) % QUEUEDEPTH; |
164 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
160 | queue[i] = p; |
167 | queue[i] = p; |
161 | |
168 | |
162 | i = (i + 1) % QUEUEDEPTH; |
169 | i = (i + 1) % QUEUEDEPTH; |
163 | } |
170 | } |
164 | |
171 | |
165 | tap_packet *pkt_queue::get () |
172 | net_packet *pkt_queue::get () |
166 | { |
173 | { |
167 | tap_packet *p = queue[j]; |
174 | net_packet *p = queue[j]; |
168 | |
175 | |
169 | if (p) |
176 | if (p) |
170 | { |
177 | { |
171 | queue[j] = 0; |
178 | queue[j] = 0; |
172 | j = (j + 1) % QUEUEDEPTH; |
179 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
197 | // 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. |
198 | // this implementation ("splay list" ;) is inefficient, |
205 | // this implementation ("splay list" ;) is inefficient, |
199 | // but low on resources. |
206 | // but low on resources. |
200 | struct net_rate_limiter : list<net_rateinfo> |
207 | struct net_rate_limiter : list<net_rateinfo> |
201 | { |
208 | { |
202 | static const double ALPHA = 1. - 1. / 180.; // allow bursts |
209 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
203 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
210 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
204 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
211 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
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212 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
205 | |
213 | |
206 | bool can (const sockinfo &si) { return can((u32)si.host); } |
214 | bool can (const sockinfo &si) { return can((u32)si.host); } |
207 | bool can (u32 host); |
215 | bool can (u32 host); |
208 | }; |
216 | }; |
209 | |
217 | |
210 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
218 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
211 | |
219 | |
… | |
… | |
214 | iterator i; |
222 | iterator i; |
215 | |
223 | |
216 | for (i = begin (); i != end (); ) |
224 | for (i = begin (); i != end (); ) |
217 | if (i->host == host) |
225 | if (i->host == host) |
218 | break; |
226 | break; |
219 | else if (i->last < NOW - EXPIRE) |
227 | else if (i->last < NOW - NRL_EXPIRE) |
220 | i = erase (i); |
228 | i = erase (i); |
221 | else |
229 | else |
222 | i++; |
230 | i++; |
223 | |
231 | |
224 | if (i == end ()) |
232 | if (i == end ()) |
225 | { |
233 | { |
226 | net_rateinfo ri; |
234 | net_rateinfo ri; |
227 | |
235 | |
228 | ri.host = host; |
236 | ri.host = host; |
229 | ri.pcnt = 1.; |
237 | ri.pcnt = 1.; |
230 | ri.diff = CUTOFF * (1. / (1. - ALPHA)); |
238 | ri.diff = NRL_MAXDIF; |
231 | ri.last = NOW; |
239 | ri.last = NOW; |
232 | |
240 | |
233 | push_front (ri); |
241 | push_front (ri); |
234 | |
242 | |
235 | return true; |
243 | return true; |
… | |
… | |
237 | else |
245 | else |
238 | { |
246 | { |
239 | net_rateinfo ri (*i); |
247 | net_rateinfo ri (*i); |
240 | erase (i); |
248 | erase (i); |
241 | |
249 | |
242 | ri.pcnt = ri.pcnt * ALPHA; |
250 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
243 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
251 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
244 | |
252 | |
245 | ri.last = NOW; |
253 | ri.last = NOW; |
246 | |
254 | |
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|
255 | double dif = ri.diff / ri.pcnt; |
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256 | |
247 | bool send = ri.diff / ri.pcnt > CUTOFF; |
257 | bool send = dif > NRL_CUTOFF; |
248 | |
258 | |
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259 | if (dif > NRL_MAXDIF) |
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260 | { |
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261 | ri.pcnt = 1.; |
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262 | ri.diff = NRL_MAXDIF; |
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263 | } |
249 | if (send) |
264 | else if (send) |
250 | ri.pcnt++; |
265 | ri.pcnt++; |
251 | |
266 | |
252 | push_front (ri); |
267 | push_front (ri); |
253 | |
268 | |
254 | return send; |
269 | return send; |
… | |
… | |
299 | } |
314 | } |
300 | |
315 | |
301 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
316 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
302 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
317 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
303 | |
318 | |
304 | struct vpndata_packet:vpn_packet |
319 | struct vpndata_packet : vpn_packet |
305 | { |
320 | { |
306 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
321 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
307 | |
322 | |
308 | 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); |
309 | tap_packet *unpack (connection *conn, u32 &seqno); |
324 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
322 | int outl = 0, outl2; |
337 | int outl = 0, outl2; |
323 | ptype type = PT_DATA_UNCOMPRESSED; |
338 | ptype type = PT_DATA_UNCOMPRESSED; |
324 | |
339 | |
325 | #if ENABLE_COMPRESSION |
340 | #if ENABLE_COMPRESSION |
326 | u8 cdata[MAX_MTU]; |
341 | u8 cdata[MAX_MTU]; |
327 | u32 cl; |
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328 | |
342 | |
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343 | if (conn->features & ENABLE_COMPRESSION) |
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344 | { |
329 | 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 | |
330 | if (cl) |
347 | if (cl) |
331 | { |
348 | { |
332 | type = PT_DATA_COMPRESSED; |
349 | type = PT_DATA_COMPRESSED; |
333 | d = cdata; |
350 | d = cdata; |
334 | l = cl + 2; |
351 | l = cl + 2; |
335 | |
352 | |
336 | d[0] = cl >> 8; |
353 | d[0] = cl >> 8; |
337 | d[1] = cl; |
354 | d[1] = cl; |
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|
355 | } |
338 | } |
356 | } |
339 | #endif |
357 | #endif |
340 | |
358 | |
341 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
359 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
342 | |
360 | |
343 | struct { |
361 | struct { |
344 | #if RAND_SIZE |
362 | #if RAND_SIZE |
345 | u8 rnd[RAND_SIZE]; |
363 | u8 rnd[RAND_SIZE]; |
346 | #endif |
364 | #endif |
… | |
… | |
350 | datahdr.seqno = ntohl (seqno); |
368 | datahdr.seqno = ntohl (seqno); |
351 | #if RAND_SIZE |
369 | #if RAND_SIZE |
352 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
370 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
353 | #endif |
371 | #endif |
354 | |
372 | |
355 | EVP_EncryptUpdate (cctx, |
373 | require (EVP_EncryptUpdate (cctx, |
356 | (unsigned char *) data + outl, &outl2, |
374 | (unsigned char *) data + outl, &outl2, |
357 | (unsigned char *) &datahdr, DATAHDR); |
375 | (unsigned char *) &datahdr, DATAHDR)); |
358 | outl += outl2; |
376 | outl += outl2; |
359 | |
377 | |
360 | EVP_EncryptUpdate (cctx, |
378 | require (EVP_EncryptUpdate (cctx, |
361 | (unsigned char *) data + outl, &outl2, |
379 | (unsigned char *) data + outl, &outl2, |
362 | (unsigned char *) d, l); |
380 | (unsigned char *) d, l)); |
363 | outl += outl2; |
381 | outl += outl2; |
364 | |
382 | |
365 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
383 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
366 | outl += outl2; |
384 | outl += outl2; |
367 | |
385 | |
368 | len = outl + data_hdr_size (); |
386 | len = outl + data_hdr_size (); |
369 | |
387 | |
370 | set_hdr (type, dst); |
388 | set_hdr (type, dst); |
… | |
… | |
379 | int outl = 0, outl2; |
397 | int outl = 0, outl2; |
380 | tap_packet *p = new tap_packet; |
398 | tap_packet *p = new tap_packet; |
381 | u8 *d; |
399 | u8 *d; |
382 | u32 l = len - data_hdr_size (); |
400 | u32 l = len - data_hdr_size (); |
383 | |
401 | |
384 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
402 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
385 | |
403 | |
386 | #if ENABLE_COMPRESSION |
404 | #if ENABLE_COMPRESSION |
387 | u8 cdata[MAX_MTU]; |
405 | u8 cdata[MAX_MTU]; |
388 | |
406 | |
389 | if (type == PT_DATA_COMPRESSED) |
407 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
391 | else |
409 | else |
392 | #endif |
410 | #endif |
393 | d = &(*p)[6 + 6 - DATAHDR]; |
411 | d = &(*p)[6 + 6 - DATAHDR]; |
394 | |
412 | |
395 | /* 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 */ |
396 | EVP_DecryptUpdate (cctx, |
414 | require (EVP_DecryptUpdate (cctx, |
397 | d, &outl2, |
415 | d, &outl2, |
398 | (unsigned char *)&data, len - data_hdr_size ()); |
416 | (unsigned char *)&data, len - data_hdr_size ())); |
399 | outl += outl2; |
417 | outl += outl2; |
400 | |
418 | |
401 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
419 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
402 | outl += outl2; |
420 | outl += outl2; |
403 | |
421 | |
404 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
422 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
405 | |
423 | |
406 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
424 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
435 | { |
453 | { |
436 | // actually, hmaclen cannot be checked because the hmac |
454 | // actually, hmaclen cannot be checked because the hmac |
437 | // field comes before this data, so peers with other |
455 | // field comes before this data, so peers with other |
438 | // hmacs simply will not work. |
456 | // hmacs simply will not work. |
439 | u8 prot_major, prot_minor, randsize, hmaclen; |
457 | u8 prot_major, prot_minor, randsize, hmaclen; |
440 | u8 flags, challengelen, pad2, pad3; |
458 | u8 flags, challengelen, features, pad3; |
441 | u32 cipher_nid, digest_nid, hmac_nid; |
459 | u32 cipher_nid, digest_nid, hmac_nid; |
442 | |
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443 | const u8 curflags () const |
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|
444 | { |
|
|
445 | return 0x80 |
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|
446 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
447 | } |
|
|
448 | |
460 | |
449 | void setup (ptype type, int dst); |
461 | void setup (ptype type, int dst); |
450 | bool chk_config () const; |
462 | bool chk_config () const; |
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463 | |
|
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464 | static u8 get_features () |
|
|
465 | { |
|
|
466 | u8 f = 0; |
|
|
467 | #if ENABLE_COMPRESSION |
|
|
468 | f |= FEATURE_COMPRESSION; |
|
|
469 | #endif |
|
|
470 | #if ENABLE_ROHC |
|
|
471 | f |= FEATURE_ROHC; |
|
|
472 | #endif |
|
|
473 | return f; |
|
|
474 | } |
451 | }; |
475 | }; |
452 | |
476 | |
453 | void config_packet::setup (ptype type, int dst) |
477 | void config_packet::setup (ptype type, int dst) |
454 | { |
478 | { |
455 | prot_major = PROTOCOL_MAJOR; |
479 | prot_major = PROTOCOL_MAJOR; |
456 | prot_minor = PROTOCOL_MINOR; |
480 | prot_minor = PROTOCOL_MINOR; |
457 | randsize = RAND_SIZE; |
481 | randsize = RAND_SIZE; |
458 | hmaclen = HMACLENGTH; |
482 | hmaclen = HMACLENGTH; |
459 | flags = curflags (); |
483 | flags = 0; |
460 | challengelen = sizeof (rsachallenge); |
484 | challengelen = sizeof (rsachallenge); |
|
|
485 | features = get_features (); |
461 | |
486 | |
462 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
487 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
463 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
488 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
464 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
489 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
465 | |
490 | |
… | |
… | |
467 | set_hdr (type, dst); |
492 | set_hdr (type, dst); |
468 | } |
493 | } |
469 | |
494 | |
470 | bool config_packet::chk_config () const |
495 | bool config_packet::chk_config () const |
471 | { |
496 | { |
472 | return prot_major == PROTOCOL_MAJOR |
497 | if (prot_major != PROTOCOL_MAJOR) |
473 | && randsize == RAND_SIZE |
498 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
474 | && hmaclen == HMACLENGTH |
499 | else if (randsize != RAND_SIZE) |
475 | && flags == curflags () |
500 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
|
|
501 | else if (hmaclen != HMACLENGTH) |
|
|
502 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
476 | && challengelen == sizeof (rsachallenge) |
503 | else if (challengelen != sizeof (rsachallenge)) |
|
|
504 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
477 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
505 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
|
|
506 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
478 | && digest_nid == htonl (EVP_MD_type (RSA_HASH)) |
507 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
|
|
508 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
479 | && hmac_nid == htonl (EVP_MD_type (DIGEST)); |
509 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
|
|
510 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
|
|
511 | else |
|
|
512 | return true; |
|
|
513 | |
|
|
514 | return false; |
480 | } |
515 | } |
481 | |
516 | |
482 | struct auth_req_packet : config_packet |
517 | struct auth_req_packet : config_packet |
483 | { |
518 | { |
484 | char magic[8]; |
519 | char magic[8]; |
485 | u8 initiate; // false if this is just an automatic reply |
520 | u8 initiate; // false if this is just an automatic reply |
486 | u8 protocols; // supported protocols (will get patches on forward) |
521 | u8 protocols; // supported protocols (will be patched on forward) |
487 | u8 pad2, pad3; |
522 | u8 pad2, pad3; |
488 | rsaid id; |
523 | rsaid id; |
489 | rsaencrdata encr; |
524 | rsaencrdata encr; |
490 | |
525 | |
491 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
526 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
546 | }; |
581 | }; |
547 | |
582 | |
548 | ///////////////////////////////////////////////////////////////////////////// |
583 | ///////////////////////////////////////////////////////////////////////////// |
549 | |
584 | |
550 | void |
585 | void |
|
|
586 | connection::connection_established () |
|
|
587 | { |
|
|
588 | if (ictx && octx) |
|
|
589 | { |
|
|
590 | connectmode = conf->connectmode; |
|
|
591 | |
|
|
592 | // make sure rekeying timeouts are slightly asymmetric |
|
|
593 | rekey.start (NOW + ::conf.rekey |
|
|
594 | + (conf->id > THISNODE->id ? 10 : 0)); |
|
|
595 | keepalive.start (NOW + ::conf.keepalive); |
|
|
596 | |
|
|
597 | // send queued packets |
|
|
598 | if (ictx && octx) |
|
|
599 | { |
|
|
600 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
|
|
601 | { |
|
|
602 | send_data_packet (p); |
|
|
603 | delete p; |
|
|
604 | } |
|
|
605 | |
|
|
606 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
607 | { |
|
|
608 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
609 | delete p; |
|
|
610 | } |
|
|
611 | } |
|
|
612 | } |
|
|
613 | else |
|
|
614 | { |
|
|
615 | retry_cnt = 0; |
|
|
616 | establish_connection.start (NOW + 5); |
|
|
617 | keepalive.stop (); |
|
|
618 | rekey.stop (); |
|
|
619 | } |
|
|
620 | } |
|
|
621 | |
|
|
622 | void |
551 | connection::reset_si () |
623 | connection::reset_si () |
552 | { |
624 | { |
553 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
625 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
554 | |
626 | |
555 | // mask out protocols we cannot establish |
627 | // mask out protocols we cannot establish |
556 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
628 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
557 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
629 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
630 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
558 | |
631 | |
559 | si.set (conf, protocol); |
632 | si.set (conf, protocol); |
560 | } |
633 | } |
561 | |
634 | |
562 | // ensure sockinfo is valid, forward if necessary |
635 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
567 | { |
640 | { |
568 | connection *r = vpn->find_router (); |
641 | connection *r = vpn->find_router (); |
569 | |
642 | |
570 | if (r) |
643 | if (r) |
571 | { |
644 | { |
572 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
645 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
573 | conf->nodename, r->conf->nodename); |
646 | conf->nodename, r->conf->nodename, (const char *)r->si); |
574 | return r->si; |
647 | return r->si; |
575 | } |
648 | } |
576 | else |
649 | else |
577 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
650 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
578 | conf->nodename); |
651 | conf->nodename); |
… | |
… | |
580 | |
653 | |
581 | return si; |
654 | return si; |
582 | } |
655 | } |
583 | |
656 | |
584 | void |
657 | void |
|
|
658 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
659 | { |
|
|
660 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
|
|
661 | reset_connection (); |
|
|
662 | } |
|
|
663 | |
|
|
664 | void |
585 | connection::send_ping (const sockinfo &si, u8 pong) |
665 | connection::send_ping (const sockinfo &si, u8 pong) |
586 | { |
666 | { |
587 | ping_packet *pkt = new ping_packet; |
667 | ping_packet *pkt = new ping_packet; |
588 | |
668 | |
589 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
669 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
590 | vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
670 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
591 | |
671 | |
592 | delete pkt; |
672 | delete pkt; |
593 | } |
673 | } |
594 | |
674 | |
595 | void |
675 | void |
… | |
… | |
598 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
678 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
599 | { |
679 | { |
600 | config_packet *pkt = new config_packet; |
680 | config_packet *pkt = new config_packet; |
601 | |
681 | |
602 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
682 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
603 | vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST); |
683 | send_vpn_packet (pkt, si, IPTOS_MINCOST); |
604 | |
684 | |
605 | delete pkt; |
685 | delete pkt; |
606 | } |
686 | } |
607 | } |
687 | } |
608 | |
688 | |
… | |
… | |
610 | connection::send_auth_request (const sockinfo &si, bool initiate) |
690 | connection::send_auth_request (const sockinfo &si, bool initiate) |
611 | { |
691 | { |
612 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
692 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
613 | |
693 | |
614 | rsachallenge chg; |
694 | rsachallenge chg; |
615 | |
|
|
616 | rsa_cache.gen (pkt->id, chg); |
695 | rsa_cache.gen (pkt->id, chg); |
617 | |
696 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
618 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
619 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
620 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
621 | fatal ("RSA_public_encrypt error"); |
|
|
622 | |
697 | |
623 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
698 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
624 | |
699 | |
625 | vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
700 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
626 | |
701 | |
627 | delete pkt; |
702 | delete pkt; |
628 | } |
703 | } |
629 | |
704 | |
630 | void |
705 | void |
… | |
… | |
638 | |
713 | |
639 | pkt->hmac_set (octx); |
714 | pkt->hmac_set (octx); |
640 | |
715 | |
641 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
716 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
642 | |
717 | |
643 | vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
718 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
644 | |
719 | |
645 | delete pkt; |
720 | delete pkt; |
646 | } |
721 | } |
647 | |
722 | |
648 | void |
723 | void |
… | |
… | |
652 | conf->id, rid, (const char *)rsi); |
727 | conf->id, rid, (const char *)rsi); |
653 | |
728 | |
654 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
729 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
655 | |
730 | |
656 | r->hmac_set (octx); |
731 | r->hmac_set (octx); |
657 | vpn->send_vpn_packet (r, si); |
732 | send_vpn_packet (r, si); |
658 | |
733 | |
659 | delete r; |
734 | delete r; |
660 | } |
735 | } |
661 | |
736 | |
662 | void |
737 | void |
663 | connection::establish_connection_cb (time_watcher &w) |
738 | connection::establish_connection_cb (time_watcher &w) |
664 | { |
739 | { |
665 | if (ictx || conf == THISNODE |
740 | if (!ictx |
|
|
741 | && conf != THISNODE |
666 | || connectmode == conf_node::C_NEVER |
742 | && connectmode != conf_node::C_NEVER |
667 | || connectmode == conf_node::C_DISABLED) |
743 | && connectmode != conf_node::C_DISABLED |
668 | w.at = TSTAMP_CANCEL; |
744 | && NOW > w.at) |
669 | else if (w.at <= NOW) |
|
|
670 | { |
745 | { |
671 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
746 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
672 | |
747 | |
673 | if (retry_int < 3600 * 8) |
748 | double retry_int = double (retry_cnt & 3 |
674 | retry_cnt++; |
749 | ? (retry_cnt & 3) + 1 |
675 | |
750 | : 1 << (retry_cnt >> 2)); |
676 | w.at = NOW + retry_int; |
|
|
677 | |
751 | |
678 | reset_si (); |
752 | reset_si (); |
679 | |
753 | |
|
|
754 | bool slow = si.prot & PROT_SLOW; |
|
|
755 | |
680 | if (si.prot && !si.host) |
756 | if (si.prot && !si.host) |
681 | vpn->connect_request (conf->id); |
757 | vpn->send_connect_request (conf->id); |
682 | else |
758 | else |
683 | { |
759 | { |
684 | const sockinfo &dsi = forward_si (si); |
760 | const sockinfo &dsi = forward_si (si); |
|
|
761 | |
|
|
762 | slow = slow || (dsi.prot & PROT_SLOW); |
685 | |
763 | |
686 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
764 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
687 | { |
765 | { |
688 | if (retry_cnt < 4) |
766 | if (retry_cnt < 4) |
689 | send_auth_request (dsi, true); |
767 | send_auth_request (dsi, true); |
690 | else |
768 | else |
691 | send_ping (dsi, 0); |
769 | send_ping (dsi, 0); |
692 | } |
770 | } |
693 | } |
771 | } |
|
|
772 | |
|
|
773 | retry_int *= slow ? 8. : 0.7; |
|
|
774 | |
|
|
775 | if (retry_int < conf->max_retry) |
|
|
776 | retry_cnt++; |
|
|
777 | else |
|
|
778 | retry_int = conf->max_retry; |
|
|
779 | |
|
|
780 | w.start (NOW + retry_int); |
694 | } |
781 | } |
695 | } |
782 | } |
696 | |
783 | |
697 | void |
784 | void |
698 | connection::reset_connection () |
785 | connection::reset_connection () |
… | |
… | |
706 | run_script (run_script_cb (this, &connection::script_node_down), false); |
793 | run_script (run_script_cb (this, &connection::script_node_down), false); |
707 | } |
794 | } |
708 | |
795 | |
709 | delete ictx; ictx = 0; |
796 | delete ictx; ictx = 0; |
710 | delete octx; octx = 0; |
797 | delete octx; octx = 0; |
|
|
798 | #if ENABLE_DNS |
|
|
799 | dnsv4_reset_connection (); |
|
|
800 | #endif |
711 | |
801 | |
712 | si.host= 0; |
802 | si.host = 0; |
713 | |
803 | |
714 | last_activity = 0; |
804 | last_activity = 0; |
715 | retry_cnt = 0; |
805 | retry_cnt = 0; |
716 | |
806 | |
717 | rekey.reset (); |
807 | rekey.stop (); |
718 | keepalive.reset (); |
808 | keepalive.stop (); |
719 | establish_connection.reset (); |
809 | establish_connection.stop (); |
720 | } |
810 | } |
721 | |
811 | |
722 | void |
812 | void |
723 | connection::shutdown () |
813 | connection::shutdown () |
724 | { |
814 | { |
… | |
… | |
729 | } |
819 | } |
730 | |
820 | |
731 | void |
821 | void |
732 | connection::rekey_cb (time_watcher &w) |
822 | connection::rekey_cb (time_watcher &w) |
733 | { |
823 | { |
734 | w.at = TSTAMP_CANCEL; |
|
|
735 | |
|
|
736 | reset_connection (); |
824 | reset_connection (); |
737 | establish_connection (); |
825 | establish_connection (); |
738 | } |
826 | } |
739 | |
827 | |
740 | void |
828 | void |
741 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
829 | connection::send_data_packet (tap_packet *pkt) |
742 | { |
830 | { |
743 | vpndata_packet *p = new vpndata_packet; |
831 | vpndata_packet *p = new vpndata_packet; |
744 | int tos = 0; |
832 | int tos = 0; |
745 | |
833 | |
746 | if (conf->inherit_tos |
834 | // I am not hilarious about peeking into packets, but so be it. |
747 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
835 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
748 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
749 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
836 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
750 | |
837 | |
751 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
838 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
752 | vpn->send_vpn_packet (p, si, tos); |
839 | send_vpn_packet (p, si, tos); |
753 | |
840 | |
754 | delete p; |
841 | delete p; |
755 | |
842 | |
756 | if (oseqno > MAX_SEQNO) |
843 | if (oseqno > MAX_SEQNO) |
757 | rekey (); |
844 | rekey (); |
758 | } |
845 | } |
759 | |
846 | |
760 | void |
847 | void |
761 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
848 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
762 | { |
849 | { |
763 | if (ictx && octx) |
850 | if (ictx && octx) |
764 | send_data_packet (pkt, broadcast); |
851 | send_data_packet (pkt); |
765 | else |
852 | else |
766 | { |
853 | { |
767 | if (!broadcast)//DDDD |
854 | if (!broadcast)//DDDD |
768 | queue.put (new tap_packet (*pkt)); |
855 | data_queue.put (new tap_packet (*pkt)); |
769 | |
856 | |
770 | establish_connection (); |
857 | establish_connection (); |
771 | } |
858 | } |
772 | } |
859 | } |
773 | |
860 | |
774 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
861 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
775 | { |
862 | { |
776 | if (ictx && octx) |
863 | if (ictx && octx) |
777 | vpn->send_vpn_packet (pkt, si, tos); |
864 | send_vpn_packet (pkt, si, tos); |
778 | else |
865 | else |
|
|
866 | { |
|
|
867 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
|
|
868 | |
779 | establish_connection (); |
869 | establish_connection (); |
|
|
870 | } |
780 | } |
871 | } |
781 | |
872 | |
782 | void |
873 | void |
783 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
874 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
784 | { |
875 | { |
… | |
… | |
840 | if (p->initiate) |
931 | if (p->initiate) |
841 | send_auth_request (rsi, false); |
932 | send_auth_request (rsi, false); |
842 | |
933 | |
843 | rsachallenge k; |
934 | rsachallenge k; |
844 | |
935 | |
845 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
936 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
846 | (unsigned char *)&p->encr, (unsigned char *)&k, |
937 | { |
847 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
848 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
938 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
849 | conf->nodename, (const char *)rsi); |
939 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
940 | break; |
|
|
941 | } |
850 | else |
942 | else |
851 | { |
943 | { |
852 | retry_cnt = 0; |
|
|
853 | establish_connection.start (NOW + 8); //? ;) |
|
|
854 | keepalive.reset (); |
|
|
855 | rekey.reset (); |
|
|
856 | |
|
|
857 | delete ictx; |
|
|
858 | ictx = 0; |
|
|
859 | |
|
|
860 | delete octx; |
944 | delete octx; |
861 | |
945 | |
862 | octx = new crypto_ctx (k, 1); |
946 | octx = new crypto_ctx (k, 1); |
863 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
947 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
864 | |
948 | |
865 | conf->protocols = p->protocols; |
949 | conf->protocols = p->protocols; |
|
|
950 | features = p->features & config_packet::get_features (); |
|
|
951 | |
866 | send_auth_response (rsi, p->id, k); |
952 | send_auth_response (rsi, p->id, k); |
|
|
953 | |
|
|
954 | connection_established (); |
867 | |
955 | |
868 | break; |
956 | break; |
869 | } |
957 | } |
870 | } |
958 | } |
|
|
959 | else |
|
|
960 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
|
|
961 | conf->nodename, (const char *)rsi); |
871 | |
962 | |
872 | send_reset (rsi); |
963 | send_reset (rsi); |
873 | } |
964 | } |
874 | |
965 | |
875 | break; |
966 | break; |
… | |
… | |
888 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
979 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
889 | |
980 | |
890 | rsachallenge chg; |
981 | rsachallenge chg; |
891 | |
982 | |
892 | if (!rsa_cache.find (p->id, chg)) |
983 | if (!rsa_cache.find (p->id, chg)) |
|
|
984 | { |
893 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
985 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
894 | conf->nodename, (const char *)rsi); |
986 | conf->nodename, (const char *)rsi); |
|
|
987 | break; |
|
|
988 | } |
895 | else |
989 | else |
896 | { |
990 | { |
897 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
991 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
898 | |
992 | |
899 | if (!p->hmac_chk (cctx)) |
993 | if (!p->hmac_chk (cctx)) |
|
|
994 | { |
900 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
995 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
901 | "could be an attack, or just corruption or an synchronization error"), |
996 | "could be an attack, or just corruption or a synchronization error"), |
902 | conf->nodename, (const char *)rsi); |
997 | conf->nodename, (const char *)rsi); |
|
|
998 | break; |
|
|
999 | } |
903 | else |
1000 | else |
904 | { |
1001 | { |
905 | rsaresponse h; |
1002 | rsaresponse h; |
906 | |
1003 | |
907 | rsa_hash (p->id, chg, h); |
1004 | rsa_hash (p->id, chg, h); |
… | |
… | |
915 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1012 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
916 | |
1013 | |
917 | si = rsi; |
1014 | si = rsi; |
918 | protocol = rsi.prot; |
1015 | protocol = rsi.prot; |
919 | |
1016 | |
920 | rekey.start (NOW + ::conf.rekey); |
1017 | connection_established (); |
921 | keepalive.start (NOW + ::conf.keepalive); |
|
|
922 | |
|
|
923 | // send queued packets |
|
|
924 | while (tap_packet *p = queue.get ()) |
|
|
925 | { |
|
|
926 | send_data_packet (p); |
|
|
927 | delete p; |
|
|
928 | } |
|
|
929 | |
|
|
930 | connectmode = conf->connectmode; |
|
|
931 | |
1018 | |
932 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1019 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
933 | conf->nodename, (const char *)rsi, |
1020 | conf->nodename, (const char *)rsi, |
934 | p->prot_major, p->prot_minor); |
1021 | p->prot_major, p->prot_minor); |
935 | |
1022 | |
… | |
… | |
961 | |
1048 | |
962 | if (ictx && octx) |
1049 | if (ictx && octx) |
963 | { |
1050 | { |
964 | vpndata_packet *p = (vpndata_packet *)pkt; |
1051 | vpndata_packet *p = (vpndata_packet *)pkt; |
965 | |
1052 | |
966 | if (rsi == si) |
1053 | if (!p->hmac_chk (ictx)) |
|
|
1054 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
1055 | "could be an attack, or just corruption or a synchronization error"), |
|
|
1056 | conf->nodename, (const char *)rsi); |
|
|
1057 | else |
967 | { |
1058 | { |
968 | if (!p->hmac_chk (ictx)) |
|
|
969 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
970 | "could be an attack, or just corruption or an synchronization error"), |
|
|
971 | conf->nodename, (const char *)rsi); |
|
|
972 | else |
1059 | u32 seqno; |
|
|
1060 | tap_packet *d = p->unpack (this, seqno); |
|
|
1061 | |
|
|
1062 | if (iseqno.recv_ok (seqno)) |
973 | { |
1063 | { |
974 | u32 seqno; |
1064 | vpn->tap->send (d); |
975 | tap_packet *d = p->unpack (this, seqno); |
|
|
976 | |
1065 | |
977 | if (iseqno.recv_ok (seqno)) |
1066 | if (si != rsi) |
978 | { |
1067 | { |
979 | vpn->tap->send (d); |
1068 | // fast re-sync on connection changes, useful especially for tcp/ip |
980 | |
|
|
981 | if (p->dst () == 0) // re-broadcast |
|
|
982 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
983 | { |
|
|
984 | connection *c = *i; |
|
|
985 | |
|
|
986 | if (c->conf != THISNODE && c->conf != conf) |
|
|
987 | c->inject_data_packet (d); |
|
|
988 | } |
|
|
989 | |
|
|
990 | delete d; |
|
|
991 | |
|
|
992 | break; |
1069 | si = rsi; |
|
|
1070 | |
|
|
1071 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
|
|
1072 | conf->nodename, (const char *)si, (const char *)rsi); |
993 | } |
1073 | } |
994 | } |
1074 | } |
|
|
1075 | |
|
|
1076 | delete d; |
|
|
1077 | break; |
995 | } |
1078 | } |
996 | else |
|
|
997 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi); |
|
|
998 | } |
1079 | } |
999 | |
1080 | |
1000 | send_reset (rsi); |
1081 | send_reset (rsi); |
1001 | break; |
1082 | break; |
1002 | |
1083 | |
… | |
… | |
1017 | // send connect_info packets to both sides, in case one is |
1098 | // send connect_info packets to both sides, in case one is |
1018 | // behind a nat firewall (or both ;) |
1099 | // behind a nat firewall (or both ;) |
1019 | c->send_connect_info (conf->id, si, conf->protocols); |
1100 | c->send_connect_info (conf->id, si, conf->protocols); |
1020 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1101 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1021 | } |
1102 | } |
|
|
1103 | else |
|
|
1104 | c->establish_connection (); |
1022 | } |
1105 | } |
1023 | |
1106 | |
1024 | break; |
1107 | break; |
1025 | |
1108 | |
1026 | case vpn_packet::PT_CONNECT_INFO: |
1109 | case vpn_packet::PT_CONNECT_INFO: |
1027 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1110 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1028 | { |
1111 | { |
1029 | connect_info_packet *p = (connect_info_packet *) pkt; |
1112 | connect_info_packet *p = (connect_info_packet *)pkt; |
1030 | |
1113 | |
1031 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1114 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1032 | |
1115 | { |
1033 | connection *c = vpn->conns[p->id - 1]; |
1116 | connection *c = vpn->conns[p->id - 1]; |
1034 | |
1117 | |
1035 | c->conf->protocols = p->protocols; |
1118 | c->conf->protocols = p->protocols; |
1036 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1119 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1037 | p->si.upgrade_protocol (protocol, c->conf); |
1120 | p->si.upgrade_protocol (protocol, c->conf); |
1038 | |
1121 | |
1039 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1122 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1040 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1123 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1041 | |
1124 | |
1042 | const sockinfo &dsi = forward_si (p->si); |
1125 | const sockinfo &dsi = forward_si (p->si); |
1043 | |
1126 | |
1044 | if (dsi.valid ()) |
1127 | if (dsi.valid ()) |
1045 | c->send_auth_request (dsi, true); |
1128 | c->send_auth_request (dsi, true); |
|
|
1129 | } |
1046 | } |
1130 | } |
1047 | |
1131 | |
1048 | break; |
1132 | break; |
1049 | |
1133 | |
1050 | default: |
1134 | default: |
… | |
… | |
1059 | { |
1143 | { |
1060 | reset_connection (); |
1144 | reset_connection (); |
1061 | establish_connection (); |
1145 | establish_connection (); |
1062 | } |
1146 | } |
1063 | else if (NOW < last_activity + ::conf.keepalive) |
1147 | else if (NOW < last_activity + ::conf.keepalive) |
1064 | w.at = last_activity + ::conf.keepalive; |
1148 | w.start (last_activity + ::conf.keepalive); |
1065 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1149 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1066 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1150 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1067 | { |
1151 | { |
1068 | send_ping (si); |
1152 | send_ping (si); |
1069 | w.at = NOW + 5; |
1153 | w.start (NOW + 5); |
1070 | } |
1154 | } |
|
|
1155 | else if (NOW < last_activity + ::conf.keepalive + 10) |
|
|
1156 | // hold ondemand connections implicitly a few seconds longer |
|
|
1157 | // should delete octx, though, or something like that ;) |
|
|
1158 | w.start (last_activity + ::conf.keepalive + 10); |
1071 | else |
1159 | else |
1072 | reset_connection (); |
1160 | reset_connection (); |
1073 | } |
1161 | } |
1074 | |
1162 | |
1075 | void connection::connect_request (int id) |
1163 | void connection::send_connect_request (int id) |
1076 | { |
1164 | { |
1077 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1165 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1078 | |
1166 | |
1079 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1167 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1080 | p->hmac_set (octx); |
1168 | p->hmac_set (octx); |
1081 | vpn->send_vpn_packet (p, si); |
1169 | send_vpn_packet (p, si); |
1082 | |
1170 | |
1083 | delete p; |
1171 | delete p; |
1084 | } |
1172 | } |
1085 | |
1173 | |
1086 | void connection::script_node () |
1174 | void connection::script_node () |
… | |
… | |
1110 | putenv ("STATE=down"); |
1198 | putenv ("STATE=down"); |
1111 | |
1199 | |
1112 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1200 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1113 | } |
1201 | } |
1114 | |
1202 | |
1115 | connection::connection(struct vpn *vpn_) |
1203 | connection::connection (struct vpn *vpn, conf_node *conf) |
1116 | : vpn(vpn_) |
1204 | : vpn(vpn), conf(conf) |
1117 | , rekey (this, &connection::rekey_cb) |
1205 | , rekey (this, &connection::rekey_cb) |
1118 | , keepalive (this, &connection::keepalive_cb) |
1206 | , keepalive (this, &connection::keepalive_cb) |
1119 | , establish_connection (this, &connection::establish_connection_cb) |
1207 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1208 | #if ENABLE_DNS |
|
|
1209 | , dns (0) |
|
|
1210 | #endif |
1120 | { |
1211 | { |
1121 | octx = ictx = 0; |
1212 | octx = ictx = 0; |
1122 | retry_cnt = 0; |
1213 | retry_cnt = 0; |
1123 | |
1214 | |
|
|
1215 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1216 | conf->protocols = PROT_UDPv4; |
|
|
1217 | |
1124 | connectmode = conf_node::C_ALWAYS; // initial setting |
1218 | connectmode = conf_node::C_ALWAYS; // initial setting |
1125 | reset_connection (); |
1219 | reset_connection (); |
1126 | } |
1220 | } |
1127 | |
1221 | |
1128 | connection::~connection () |
1222 | connection::~connection () |