1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
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3 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
3 | |
4 | |
4 | This program is free software; you can redistribute it and/or modify |
5 | This program is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
6 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 | */ |
18 | */ |
18 | |
19 | |
19 | #include "config.h" |
20 | #include "config.h" |
20 | |
21 | |
21 | extern "C" { |
22 | #include <cassert> |
22 | # include "lzf/lzf.h" |
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23 | } |
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24 | |
23 | |
25 | #include <list> |
24 | #include <list> |
26 | |
25 | |
27 | #include <openssl/rand.h> |
26 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
27 | #include <openssl/evp.h> |
… | |
… | |
35 | #include "slog.h" |
34 | #include "slog.h" |
36 | #include "device.h" |
35 | #include "device.h" |
37 | #include "vpn.h" |
36 | #include "vpn.h" |
38 | #include "connection.h" |
37 | #include "connection.h" |
39 | |
38 | |
40 | #include <sys/socket.h> |
39 | #include "netcompat.h" |
41 | #ifdef HAVE_NETINET_IN_H |
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42 | # include <netinet/in.h> |
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43 | #endif |
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44 | #include <arpa/inet.h> |
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45 | #include <net/if.h> |
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46 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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47 | # include <netinet/in_systm.h> |
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48 | #endif |
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49 | #ifdef HAVE_NETINET_IP_H |
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50 | # include <netinet/ip.h> |
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51 | #endif |
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52 | |
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53 | #ifndef IPTOS_TOS_MASK |
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54 | # define IPTOS_TOS_MASK (IPTOS_LOWDELAY | IPTOS_THROUGHPUT | IPTOS_RELIABILITY | IPTOS_MINCOST) |
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55 | #endif |
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56 | |
40 | |
57 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | #if !HAVE_RAND_PSEUDO_BYTES |
58 | # define RAND_pseudo_bytes RAND_bytes |
42 | # define RAND_pseudo_bytes RAND_bytes |
59 | #endif |
43 | #endif |
60 | |
44 | |
61 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
62 | |
46 | |
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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 | |
63 | struct crypto_ctx |
53 | struct crypto_ctx |
64 | { |
54 | { |
65 | EVP_CIPHER_CTX cctx; |
55 | EVP_CIPHER_CTX cctx; |
66 | HMAC_CTX hctx; |
56 | HMAC_CTX hctx; |
67 | |
57 | |
… | |
… | |
70 | }; |
60 | }; |
71 | |
61 | |
72 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
62 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
73 | { |
63 | { |
74 | EVP_CIPHER_CTX_init (&cctx); |
64 | EVP_CIPHER_CTX_init (&cctx); |
75 | 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)); |
76 | HMAC_CTX_init (&hctx); |
66 | HMAC_CTX_init (&hctx); |
77 | 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); |
78 | } |
68 | } |
79 | |
69 | |
80 | crypto_ctx::~crypto_ctx () |
70 | crypto_ctx::~crypto_ctx () |
81 | { |
71 | { |
82 | EVP_CIPHER_CTX_cleanup (&cctx); |
72 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
83 | HMAC_CTX_cleanup (&hctx); |
73 | HMAC_CTX_cleanup (&hctx); |
84 | } |
74 | } |
85 | |
75 | |
86 | static void |
76 | static void |
87 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
77 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
88 | { |
78 | { |
89 | EVP_MD_CTX ctx; |
79 | EVP_MD_CTX ctx; |
90 | |
80 | |
91 | EVP_MD_CTX_init (&ctx); |
81 | EVP_MD_CTX_init (&ctx); |
92 | EVP_DigestInit (&ctx, RSA_HASH); |
82 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
93 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
83 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
94 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
84 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
95 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
85 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
96 | EVP_MD_CTX_cleanup (&ctx); |
86 | EVP_MD_CTX_cleanup (&ctx); |
97 | } |
87 | } |
98 | |
88 | |
99 | struct rsa_entry { |
89 | struct rsa_entry { |
100 | tstamp expire; |
90 | tstamp expire; |
… | |
… | |
148 | |
138 | |
149 | } rsa_cache; |
139 | } rsa_cache; |
150 | |
140 | |
151 | void rsa_cache::cleaner_cb (time_watcher &w) |
141 | void rsa_cache::cleaner_cb (time_watcher &w) |
152 | { |
142 | { |
153 | if (empty ()) |
143 | if (!empty ()) |
154 | w.at = TSTAMP_CANCEL; |
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155 | else |
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156 | { |
144 | { |
157 | w.at = NOW + RSA_TTL; |
145 | w.start (NOW + RSA_TTL); |
158 | |
146 | |
159 | for (iterator i = begin (); i != end (); ) |
147 | for (iterator i = begin (); i != end (); ) |
160 | if (i->expire <= NOW) |
148 | if (i->expire <= NOW) |
161 | i = erase (i); |
149 | i = erase (i); |
162 | else |
150 | else |
… | |
… | |
214 | // 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. |
215 | // this implementation ("splay list" ;) is inefficient, |
203 | // this implementation ("splay list" ;) is inefficient, |
216 | // but low on resources. |
204 | // but low on resources. |
217 | struct net_rate_limiter : list<net_rateinfo> |
205 | struct net_rate_limiter : list<net_rateinfo> |
218 | { |
206 | { |
219 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
207 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
220 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
208 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
221 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
209 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
222 | 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 |
223 | |
211 | |
224 | bool can (const sockinfo &si) { return can((u32)si.host); } |
212 | bool can (const sockinfo &si) { return can((u32)si.host); } |
225 | bool can (u32 host); |
213 | bool can (u32 host); |
226 | }; |
214 | }; |
227 | |
215 | |
… | |
… | |
232 | iterator i; |
220 | iterator i; |
233 | |
221 | |
234 | for (i = begin (); i != end (); ) |
222 | for (i = begin (); i != end (); ) |
235 | if (i->host == host) |
223 | if (i->host == host) |
236 | break; |
224 | break; |
237 | else if (i->last < NOW - EXPIRE) |
225 | else if (i->last < NOW - NRL_EXPIRE) |
238 | i = erase (i); |
226 | i = erase (i); |
239 | else |
227 | else |
240 | i++; |
228 | i++; |
241 | |
229 | |
242 | if (i == end ()) |
230 | if (i == end ()) |
243 | { |
231 | { |
244 | net_rateinfo ri; |
232 | net_rateinfo ri; |
245 | |
233 | |
246 | ri.host = host; |
234 | ri.host = host; |
247 | ri.pcnt = 1.; |
235 | ri.pcnt = 1.; |
248 | ri.diff = MAXDIF; |
236 | ri.diff = NRL_MAXDIF; |
249 | ri.last = NOW; |
237 | ri.last = NOW; |
250 | |
238 | |
251 | push_front (ri); |
239 | push_front (ri); |
252 | |
240 | |
253 | return true; |
241 | return true; |
… | |
… | |
255 | else |
243 | else |
256 | { |
244 | { |
257 | net_rateinfo ri (*i); |
245 | net_rateinfo ri (*i); |
258 | erase (i); |
246 | erase (i); |
259 | |
247 | |
260 | ri.pcnt = ri.pcnt * ALPHA; |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
261 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
249 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
262 | |
250 | |
263 | ri.last = NOW; |
251 | ri.last = NOW; |
264 | |
252 | |
265 | double dif = ri.diff / ri.pcnt; |
253 | double dif = ri.diff / ri.pcnt; |
266 | |
254 | |
267 | bool send = dif > CUTOFF; |
255 | bool send = dif > NRL_CUTOFF; |
268 | |
256 | |
269 | if (dif > MAXDIF) |
257 | if (dif > NRL_MAXDIF) |
270 | { |
258 | { |
271 | ri.pcnt = 1.; |
259 | ri.pcnt = 1.; |
272 | ri.diff = MAXDIF; |
260 | ri.diff = NRL_MAXDIF; |
273 | } |
261 | } |
274 | else if (send) |
262 | else if (send) |
275 | ri.pcnt++; |
263 | ri.pcnt++; |
276 | |
264 | |
277 | push_front (ri); |
265 | push_front (ri); |
… | |
… | |
324 | } |
312 | } |
325 | |
313 | |
326 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
327 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
328 | |
316 | |
329 | struct vpndata_packet:vpn_packet |
317 | struct vpndata_packet : vpn_packet |
330 | { |
318 | { |
331 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
332 | |
320 | |
333 | 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); |
334 | tap_packet *unpack (connection *conn, u32 &seqno); |
322 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
347 | int outl = 0, outl2; |
335 | int outl = 0, outl2; |
348 | ptype type = PT_DATA_UNCOMPRESSED; |
336 | ptype type = PT_DATA_UNCOMPRESSED; |
349 | |
337 | |
350 | #if ENABLE_COMPRESSION |
338 | #if ENABLE_COMPRESSION |
351 | u8 cdata[MAX_MTU]; |
339 | u8 cdata[MAX_MTU]; |
352 | u32 cl; |
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353 | |
340 | |
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341 | if (conn->features & ENABLE_COMPRESSION) |
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342 | { |
354 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
343 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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344 | |
355 | if (cl) |
345 | if (cl) |
356 | { |
346 | { |
357 | type = PT_DATA_COMPRESSED; |
347 | type = PT_DATA_COMPRESSED; |
358 | d = cdata; |
348 | d = cdata; |
359 | l = cl + 2; |
349 | l = cl + 2; |
360 | |
350 | |
361 | d[0] = cl >> 8; |
351 | d[0] = cl >> 8; |
362 | d[1] = cl; |
352 | d[1] = cl; |
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353 | } |
363 | } |
354 | } |
364 | #endif |
355 | #endif |
365 | |
356 | |
366 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
357 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
367 | |
358 | |
368 | struct { |
359 | struct { |
369 | #if RAND_SIZE |
360 | #if RAND_SIZE |
370 | u8 rnd[RAND_SIZE]; |
361 | u8 rnd[RAND_SIZE]; |
371 | #endif |
362 | #endif |
… | |
… | |
375 | datahdr.seqno = ntohl (seqno); |
366 | datahdr.seqno = ntohl (seqno); |
376 | #if RAND_SIZE |
367 | #if RAND_SIZE |
377 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
368 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
378 | #endif |
369 | #endif |
379 | |
370 | |
380 | EVP_EncryptUpdate (cctx, |
371 | require (EVP_EncryptUpdate (cctx, |
381 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) data + outl, &outl2, |
382 | (unsigned char *) &datahdr, DATAHDR); |
373 | (unsigned char *) &datahdr, DATAHDR)); |
383 | outl += outl2; |
374 | outl += outl2; |
384 | |
375 | |
385 | EVP_EncryptUpdate (cctx, |
376 | require (EVP_EncryptUpdate (cctx, |
386 | (unsigned char *) data + outl, &outl2, |
377 | (unsigned char *) data + outl, &outl2, |
387 | (unsigned char *) d, l); |
378 | (unsigned char *) d, l)); |
388 | outl += outl2; |
379 | outl += outl2; |
389 | |
380 | |
390 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
381 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
391 | outl += outl2; |
382 | outl += outl2; |
392 | |
383 | |
393 | len = outl + data_hdr_size (); |
384 | len = outl + data_hdr_size (); |
394 | |
385 | |
395 | set_hdr (type, dst); |
386 | set_hdr (type, dst); |
… | |
… | |
404 | int outl = 0, outl2; |
395 | int outl = 0, outl2; |
405 | tap_packet *p = new tap_packet; |
396 | tap_packet *p = new tap_packet; |
406 | u8 *d; |
397 | u8 *d; |
407 | u32 l = len - data_hdr_size (); |
398 | u32 l = len - data_hdr_size (); |
408 | |
399 | |
409 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
400 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
410 | |
401 | |
411 | #if ENABLE_COMPRESSION |
402 | #if ENABLE_COMPRESSION |
412 | u8 cdata[MAX_MTU]; |
403 | u8 cdata[MAX_MTU]; |
413 | |
404 | |
414 | if (type == PT_DATA_COMPRESSED) |
405 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
416 | else |
407 | else |
417 | #endif |
408 | #endif |
418 | d = &(*p)[6 + 6 - DATAHDR]; |
409 | d = &(*p)[6 + 6 - DATAHDR]; |
419 | |
410 | |
420 | /* 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 */ |
421 | EVP_DecryptUpdate (cctx, |
412 | require (EVP_DecryptUpdate (cctx, |
422 | d, &outl2, |
413 | d, &outl2, |
423 | (unsigned char *)&data, len - data_hdr_size ()); |
414 | (unsigned char *)&data, len - data_hdr_size ())); |
424 | outl += outl2; |
415 | outl += outl2; |
425 | |
416 | |
426 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
417 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
427 | outl += outl2; |
418 | outl += outl2; |
428 | |
419 | |
429 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
420 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
430 | |
421 | |
431 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
422 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
460 | { |
451 | { |
461 | // actually, hmaclen cannot be checked because the hmac |
452 | // actually, hmaclen cannot be checked because the hmac |
462 | // field comes before this data, so peers with other |
453 | // field comes before this data, so peers with other |
463 | // hmacs simply will not work. |
454 | // hmacs simply will not work. |
464 | u8 prot_major, prot_minor, randsize, hmaclen; |
455 | u8 prot_major, prot_minor, randsize, hmaclen; |
465 | u8 flags, challengelen, pad2, pad3; |
456 | u8 flags, challengelen, features, pad3; |
466 | u32 cipher_nid, digest_nid, hmac_nid; |
457 | u32 cipher_nid, digest_nid, hmac_nid; |
467 | |
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468 | const u8 curflags () const |
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469 | { |
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470 | return 0x80 |
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471 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
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472 | } |
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473 | |
458 | |
474 | void setup (ptype type, int dst); |
459 | void setup (ptype type, int dst); |
475 | bool chk_config () const; |
460 | bool chk_config () const; |
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461 | |
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462 | static u8 get_features () |
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463 | { |
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464 | u8 f = 0; |
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465 | #if ENABLE_COMPRESSION |
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466 | f |= FEATURE_COMPRESSION; |
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467 | #endif |
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468 | #if ENABLE_ROHC |
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469 | f |= FEATURE_ROHC; |
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470 | #endif |
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471 | return f; |
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472 | } |
476 | }; |
473 | }; |
477 | |
474 | |
478 | void config_packet::setup (ptype type, int dst) |
475 | void config_packet::setup (ptype type, int dst) |
479 | { |
476 | { |
480 | prot_major = PROTOCOL_MAJOR; |
477 | prot_major = PROTOCOL_MAJOR; |
481 | prot_minor = PROTOCOL_MINOR; |
478 | prot_minor = PROTOCOL_MINOR; |
482 | randsize = RAND_SIZE; |
479 | randsize = RAND_SIZE; |
483 | hmaclen = HMACLENGTH; |
480 | hmaclen = HMACLENGTH; |
484 | flags = curflags (); |
481 | flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
485 | challengelen = sizeof (rsachallenge); |
482 | challengelen = sizeof (rsachallenge); |
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483 | features = get_features (); |
486 | |
484 | |
487 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
485 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
488 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
486 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
489 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
487 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
490 | |
488 | |
… | |
… | |
493 | } |
491 | } |
494 | |
492 | |
495 | bool config_packet::chk_config () const |
493 | bool config_packet::chk_config () const |
496 | { |
494 | { |
497 | if (prot_major != PROTOCOL_MAJOR) |
495 | if (prot_major != PROTOCOL_MAJOR) |
498 | slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); |
496 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
499 | else if (randsize != RAND_SIZE) |
497 | else if (randsize != RAND_SIZE) |
500 | slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); |
498 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
501 | else if (hmaclen != HMACLENGTH) |
499 | else if (hmaclen != HMACLENGTH) |
502 | slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
500 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
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501 | #if 0 // this implementation should handle all flag settings |
503 | else if (flags != curflags ()) |
502 | else if (flags != curflags ()) |
504 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
503 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
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504 | #endif |
505 | else if (challengelen != sizeof (rsachallenge)) |
505 | else if (challengelen != sizeof (rsachallenge)) |
506 | slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); |
506 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
507 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
507 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
508 | slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
508 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
509 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
509 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
510 | slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
510 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
511 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
511 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
512 | slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
512 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
513 | else |
513 | else |
514 | return true; |
514 | return true; |
515 | |
515 | |
516 | return false; |
516 | return false; |
517 | } |
517 | } |
518 | |
518 | |
519 | struct auth_req_packet : config_packet |
519 | struct auth_req_packet : config_packet |
520 | { |
520 | { |
521 | char magic[8]; |
521 | char magic[8]; |
522 | u8 initiate; // false if this is just an automatic reply |
522 | u8 initiate; // false if this is just an automatic reply |
523 | u8 protocols; // supported protocols (will get patches on forward) |
523 | u8 protocols; // supported protocols (will be patched on forward) |
524 | u8 pad2, pad3; |
524 | u8 pad2, pad3; |
525 | rsaid id; |
525 | rsaid id; |
526 | rsaencrdata encr; |
526 | rsaencrdata encr; |
527 | |
527 | |
528 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
528 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
589 | { |
589 | { |
590 | if (ictx && octx) |
590 | if (ictx && octx) |
591 | { |
591 | { |
592 | connectmode = conf->connectmode; |
592 | connectmode = conf->connectmode; |
593 | |
593 | |
|
|
594 | // make sure rekeying timeouts are slightly asymmetric |
594 | rekey.start (NOW + ::conf.rekey); |
595 | rekey.start (NOW + ::conf.rekey |
|
|
596 | + (conf->id > THISNODE->id ? 10 : 0)); |
595 | keepalive.start (NOW + ::conf.keepalive); |
597 | keepalive.start (NOW + ::conf.keepalive); |
596 | |
598 | |
597 | // send queued packets |
599 | // send queued packets |
598 | if (ictx && octx) |
600 | if (ictx && octx) |
599 | { |
601 | { |
… | |
… | |
612 | } |
614 | } |
613 | else |
615 | else |
614 | { |
616 | { |
615 | retry_cnt = 0; |
617 | retry_cnt = 0; |
616 | establish_connection.start (NOW + 5); |
618 | establish_connection.start (NOW + 5); |
617 | keepalive.reset (); |
619 | keepalive.stop (); |
618 | rekey.reset (); |
620 | rekey.stop (); |
619 | } |
621 | } |
620 | } |
622 | } |
621 | |
623 | |
622 | void |
624 | void |
623 | connection::reset_si () |
625 | connection::reset_si () |
… | |
… | |
689 | connection::send_auth_request (const sockinfo &si, bool initiate) |
691 | connection::send_auth_request (const sockinfo &si, bool initiate) |
690 | { |
692 | { |
691 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
693 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
692 | |
694 | |
693 | rsachallenge chg; |
695 | rsachallenge chg; |
694 | |
|
|
695 | rsa_cache.gen (pkt->id, chg); |
696 | rsa_cache.gen (pkt->id, chg); |
696 | |
697 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
697 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
698 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
699 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
700 | fatal ("RSA_public_encrypt error"); |
|
|
701 | |
698 | |
702 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
699 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
703 | |
700 | |
704 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
701 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
705 | |
702 | |
… | |
… | |
739 | } |
736 | } |
740 | |
737 | |
741 | void |
738 | void |
742 | connection::establish_connection_cb (time_watcher &w) |
739 | connection::establish_connection_cb (time_watcher &w) |
743 | { |
740 | { |
744 | if (ictx || conf == THISNODE |
741 | if (!ictx |
|
|
742 | && conf != THISNODE |
745 | || connectmode == conf_node::C_NEVER |
743 | && connectmode != conf_node::C_NEVER |
746 | || connectmode == conf_node::C_DISABLED) |
744 | && connectmode != conf_node::C_DISABLED |
747 | w.at = TSTAMP_CANCEL; |
745 | && NOW > w.at) |
748 | else if (w.at <= NOW) |
|
|
749 | { |
746 | { |
750 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
747 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
751 | |
748 | |
752 | if (retry_int < 3600 * 8) |
749 | if (retry_int < 3600 * 8) |
753 | retry_cnt++; |
750 | retry_cnt++; |
754 | |
751 | |
755 | w.at = NOW + retry_int; |
752 | w.start (NOW + retry_int); |
756 | |
753 | |
757 | reset_si (); |
754 | reset_si (); |
758 | |
755 | |
759 | if (si.prot && !si.host) |
756 | if (si.prot && !si.host) |
760 | vpn->send_connect_request (conf->id); |
757 | vpn->send_connect_request (conf->id); |
… | |
… | |
791 | si.host= 0; |
788 | si.host= 0; |
792 | |
789 | |
793 | last_activity = 0; |
790 | last_activity = 0; |
794 | retry_cnt = 0; |
791 | retry_cnt = 0; |
795 | |
792 | |
796 | rekey.reset (); |
793 | rekey.stop (); |
797 | keepalive.reset (); |
794 | keepalive.stop (); |
798 | establish_connection.reset (); |
795 | establish_connection.stop (); |
799 | } |
796 | } |
800 | |
797 | |
801 | void |
798 | void |
802 | connection::shutdown () |
799 | connection::shutdown () |
803 | { |
800 | { |
… | |
… | |
808 | } |
805 | } |
809 | |
806 | |
810 | void |
807 | void |
811 | connection::rekey_cb (time_watcher &w) |
808 | connection::rekey_cb (time_watcher &w) |
812 | { |
809 | { |
813 | w.at = TSTAMP_CANCEL; |
|
|
814 | |
|
|
815 | reset_connection (); |
810 | reset_connection (); |
816 | establish_connection (); |
811 | establish_connection (); |
817 | } |
812 | } |
818 | |
813 | |
819 | void |
814 | void |
820 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
815 | connection::send_data_packet (tap_packet *pkt) |
821 | { |
816 | { |
822 | vpndata_packet *p = new vpndata_packet; |
817 | vpndata_packet *p = new vpndata_packet; |
823 | int tos = 0; |
818 | int tos = 0; |
824 | |
819 | |
825 | // I am not hilarious about peeking into packets, but so be it. |
820 | // I am not hilarious about peeking into packets, but so be it. |
826 | if (conf->inherit_tos |
821 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
827 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
|
|
828 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
829 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
822 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
830 | |
823 | |
831 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
824 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
832 | send_vpn_packet (p, si, tos); |
825 | send_vpn_packet (p, si, tos); |
833 | |
826 | |
834 | delete p; |
827 | delete p; |
835 | |
828 | |
836 | if (oseqno > MAX_SEQNO) |
829 | if (oseqno > MAX_SEQNO) |
837 | rekey (); |
830 | rekey (); |
838 | } |
831 | } |
839 | |
832 | |
840 | void |
833 | void |
841 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
834 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
842 | { |
835 | { |
843 | if (ictx && octx) |
836 | if (ictx && octx) |
844 | send_data_packet (pkt, broadcast); |
837 | send_data_packet (pkt); |
845 | else |
838 | else |
846 | { |
839 | { |
847 | if (!broadcast)//DDDD |
840 | if (!broadcast)//DDDD |
848 | data_queue.put (new tap_packet (*pkt)); |
841 | data_queue.put (new tap_packet (*pkt)); |
849 | |
842 | |
… | |
… | |
855 | { |
848 | { |
856 | if (ictx && octx) |
849 | if (ictx && octx) |
857 | send_vpn_packet (pkt, si, tos); |
850 | send_vpn_packet (pkt, si, tos); |
858 | else |
851 | else |
859 | { |
852 | { |
860 | vpn_queue.put (new vpn_packet (*pkt)); |
853 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
861 | |
854 | |
862 | establish_connection (); |
855 | establish_connection (); |
863 | } |
856 | } |
864 | } |
857 | } |
865 | |
858 | |
… | |
… | |
924 | if (p->initiate) |
917 | if (p->initiate) |
925 | send_auth_request (rsi, false); |
918 | send_auth_request (rsi, false); |
926 | |
919 | |
927 | rsachallenge k; |
920 | rsachallenge k; |
928 | |
921 | |
929 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
922 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
930 | (unsigned char *)&p->encr, (unsigned char *)&k, |
923 | { |
931 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
932 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
924 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
933 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
925 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
926 | break; |
|
|
927 | } |
934 | else |
928 | else |
935 | { |
929 | { |
936 | delete octx; |
930 | delete octx; |
937 | |
931 | |
938 | octx = new crypto_ctx (k, 1); |
932 | octx = new crypto_ctx (k, 1); |
939 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
933 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
940 | |
934 | |
|
|
935 | // compatibility code, remove when no longer required |
|
|
936 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
937 | |
941 | conf->protocols = p->protocols; |
938 | conf->protocols = p->protocols; |
|
|
939 | features = p->features & config_packet::get_features (); |
942 | |
940 | |
943 | send_auth_response (rsi, p->id, k); |
941 | send_auth_response (rsi, p->id, k); |
944 | |
942 | |
945 | connection_established (); |
943 | connection_established (); |
946 | |
944 | |
… | |
… | |
982 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
980 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
983 | |
981 | |
984 | if (!p->hmac_chk (cctx)) |
982 | if (!p->hmac_chk (cctx)) |
985 | { |
983 | { |
986 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
984 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
987 | "could be an attack, or just corruption or an synchronization error"), |
985 | "could be an attack, or just corruption or a synchronization error"), |
988 | conf->nodename, (const char *)rsi); |
986 | conf->nodename, (const char *)rsi); |
989 | break; |
987 | break; |
990 | } |
988 | } |
991 | else |
989 | else |
992 | { |
990 | { |
… | |
… | |
1041 | { |
1039 | { |
1042 | vpndata_packet *p = (vpndata_packet *)pkt; |
1040 | vpndata_packet *p = (vpndata_packet *)pkt; |
1043 | |
1041 | |
1044 | if (!p->hmac_chk (ictx)) |
1042 | if (!p->hmac_chk (ictx)) |
1045 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1043 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1046 | "could be an attack, or just corruption or an synchronization error"), |
1044 | "could be an attack, or just corruption or a synchronization error"), |
1047 | conf->nodename, (const char *)rsi); |
1045 | conf->nodename, (const char *)rsi); |
1048 | else |
1046 | else |
1049 | { |
1047 | { |
1050 | u32 seqno; |
1048 | u32 seqno; |
1051 | tap_packet *d = p->unpack (this, seqno); |
1049 | tap_packet *d = p->unpack (this, seqno); |
1052 | |
1050 | |
1053 | if (iseqno.recv_ok (seqno)) |
1051 | if (iseqno.recv_ok (seqno)) |
1054 | { |
1052 | { |
1055 | vpn->tap->send (d); |
1053 | vpn->tap->send (d); |
1056 | |
1054 | |
1057 | if (p->dst () == 0) // re-broadcast |
|
|
1058 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
1059 | { |
|
|
1060 | connection *c = *i; |
|
|
1061 | |
|
|
1062 | if (c->conf != THISNODE && c->conf != conf) |
|
|
1063 | c->inject_data_packet (d); |
|
|
1064 | } |
|
|
1065 | |
|
|
1066 | if (si != rsi) |
1055 | if (si != rsi) |
1067 | { |
1056 | { |
1068 | // fast re-sync on connection changes, useful especially for tcp/ip |
1057 | // fast re-sync on connection changes, useful especially for tcp/ip |
1069 | si = rsi; |
1058 | si = rsi; |
1070 | |
1059 | |
1071 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1060 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1072 | conf->nodename, (const char *)si, (const char *)rsi); |
1061 | conf->nodename, (const char *)si, (const char *)rsi); |
1073 | } |
1062 | } |
1074 | |
|
|
1075 | delete d; |
|
|
1076 | |
|
|
1077 | break; |
|
|
1078 | } |
1063 | } |
|
|
1064 | |
|
|
1065 | delete d; |
|
|
1066 | break; |
1079 | } |
1067 | } |
1080 | } |
1068 | } |
1081 | |
1069 | |
1082 | send_reset (rsi); |
1070 | send_reset (rsi); |
1083 | break; |
1071 | break; |
… | |
… | |
1143 | { |
1131 | { |
1144 | reset_connection (); |
1132 | reset_connection (); |
1145 | establish_connection (); |
1133 | establish_connection (); |
1146 | } |
1134 | } |
1147 | else if (NOW < last_activity + ::conf.keepalive) |
1135 | else if (NOW < last_activity + ::conf.keepalive) |
1148 | w.at = last_activity + ::conf.keepalive; |
1136 | w.start (last_activity + ::conf.keepalive); |
1149 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1137 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1150 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1138 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1151 | { |
1139 | { |
1152 | send_ping (si); |
1140 | send_ping (si); |
1153 | w.at = NOW + 5; |
1141 | w.start (NOW + 5); |
1154 | } |
1142 | } |
1155 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1143 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1156 | // hold ondemand connections implicitly a few seconds longer |
1144 | // hold ondemand connections implicitly a few seconds longer |
1157 | // should delete octx, though, or something like that ;) |
1145 | // should delete octx, though, or something like that ;) |
1158 | w.at = last_activity + ::conf.keepalive + 10; |
1146 | w.start (last_activity + ::conf.keepalive + 10); |
1159 | else |
1147 | else |
1160 | reset_connection (); |
1148 | reset_connection (); |
1161 | } |
1149 | } |
1162 | |
1150 | |
1163 | void connection::send_connect_request (int id) |
1151 | void connection::send_connect_request (int id) |