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 | |
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39 | #include "netcompat.h" |
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40 | |
40 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | # define RAND_pseudo_bytes RAND_bytes |
42 | # define RAND_pseudo_bytes RAND_bytes |
42 | #endif |
43 | #endif |
43 | |
44 | |
44 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | |
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 | |
46 | struct crypto_ctx |
53 | struct crypto_ctx |
47 | { |
54 | { |
48 | EVP_CIPHER_CTX cctx; |
55 | EVP_CIPHER_CTX cctx; |
49 | HMAC_CTX hctx; |
56 | HMAC_CTX hctx; |
50 | |
57 | |
… | |
… | |
53 | }; |
60 | }; |
54 | |
61 | |
55 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
62 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
56 | { |
63 | { |
57 | EVP_CIPHER_CTX_init (&cctx); |
64 | EVP_CIPHER_CTX_init (&cctx); |
58 | 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)); |
59 | HMAC_CTX_init (&hctx); |
66 | HMAC_CTX_init (&hctx); |
60 | 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); |
61 | } |
68 | } |
62 | |
69 | |
63 | crypto_ctx::~crypto_ctx () |
70 | crypto_ctx::~crypto_ctx () |
64 | { |
71 | { |
65 | EVP_CIPHER_CTX_cleanup (&cctx); |
72 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
66 | HMAC_CTX_cleanup (&hctx); |
73 | HMAC_CTX_cleanup (&hctx); |
67 | } |
74 | } |
68 | |
75 | |
69 | static void |
76 | static void |
70 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
77 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
71 | { |
78 | { |
72 | EVP_MD_CTX ctx; |
79 | EVP_MD_CTX ctx; |
73 | |
80 | |
74 | EVP_MD_CTX_init (&ctx); |
81 | EVP_MD_CTX_init (&ctx); |
75 | EVP_DigestInit (&ctx, RSA_HASH); |
82 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
76 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
83 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
77 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
84 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
78 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
85 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
79 | EVP_MD_CTX_cleanup (&ctx); |
86 | EVP_MD_CTX_cleanup (&ctx); |
80 | } |
87 | } |
81 | |
88 | |
82 | struct rsa_entry { |
89 | struct rsa_entry { |
83 | tstamp expire; |
90 | tstamp expire; |
… | |
… | |
85 | rsachallenge chg; |
92 | rsachallenge chg; |
86 | }; |
93 | }; |
87 | |
94 | |
88 | struct rsa_cache : list<rsa_entry> |
95 | struct rsa_cache : list<rsa_entry> |
89 | { |
96 | { |
90 | void cleaner_cb (tstamp &ts); time_watcher cleaner; |
97 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
91 | |
98 | |
92 | bool find (const rsaid &id, rsachallenge &chg) |
99 | bool find (const rsaid &id, rsachallenge &chg) |
93 | { |
100 | { |
94 | for (iterator i = begin (); i != end (); ++i) |
101 | for (iterator i = begin (); i != end (); ++i) |
95 | { |
102 | { |
… | |
… | |
129 | : cleaner (this, &rsa_cache::cleaner_cb) |
136 | : cleaner (this, &rsa_cache::cleaner_cb) |
130 | { } |
137 | { } |
131 | |
138 | |
132 | } rsa_cache; |
139 | } rsa_cache; |
133 | |
140 | |
134 | void rsa_cache::cleaner_cb (tstamp &ts) |
141 | void rsa_cache::cleaner_cb (time_watcher &w) |
135 | { |
142 | { |
136 | if (empty ()) |
143 | if (!empty ()) |
137 | ts = TSTAMP_CANCEL; |
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138 | else |
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139 | { |
144 | { |
140 | ts = NOW + RSA_TTL; |
145 | w.start (NOW + RSA_TTL); |
141 | |
146 | |
142 | for (iterator i = begin (); i != end (); ) |
147 | for (iterator i = begin (); i != end (); ) |
143 | if (i->expire <= NOW) |
148 | if (i->expire <= NOW) |
144 | i = erase (i); |
149 | i = erase (i); |
145 | else |
150 | else |
… | |
… | |
147 | } |
152 | } |
148 | } |
153 | } |
149 | |
154 | |
150 | ////////////////////////////////////////////////////////////////////////////// |
155 | ////////////////////////////////////////////////////////////////////////////// |
151 | |
156 | |
152 | void pkt_queue::put (tap_packet *p) |
157 | void pkt_queue::put (net_packet *p) |
153 | { |
158 | { |
154 | if (queue[i]) |
159 | if (queue[i]) |
155 | { |
160 | { |
156 | delete queue[i]; |
161 | delete queue[i]; |
157 | j = (j + 1) % QUEUEDEPTH; |
162 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
160 | queue[i] = p; |
165 | queue[i] = p; |
161 | |
166 | |
162 | i = (i + 1) % QUEUEDEPTH; |
167 | i = (i + 1) % QUEUEDEPTH; |
163 | } |
168 | } |
164 | |
169 | |
165 | tap_packet *pkt_queue::get () |
170 | net_packet *pkt_queue::get () |
166 | { |
171 | { |
167 | tap_packet *p = queue[j]; |
172 | net_packet *p = queue[j]; |
168 | |
173 | |
169 | if (p) |
174 | if (p) |
170 | { |
175 | { |
171 | queue[j] = 0; |
176 | queue[j] = 0; |
172 | j = (j + 1) % QUEUEDEPTH; |
177 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
197 | // 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. |
198 | // this implementation ("splay list" ;) is inefficient, |
203 | // this implementation ("splay list" ;) is inefficient, |
199 | // but low on resources. |
204 | // but low on resources. |
200 | struct net_rate_limiter : list<net_rateinfo> |
205 | struct net_rate_limiter : list<net_rateinfo> |
201 | { |
206 | { |
202 | static const double ALPHA = 1. - 1. / 90.; // allow bursts |
207 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
203 | static const double CUTOFF = 20.; // one event every CUTOFF seconds |
208 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
204 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
209 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
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|
210 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
205 | |
211 | |
206 | bool can (const sockinfo &si) { return can((u32)si.host); } |
212 | bool can (const sockinfo &si) { return can((u32)si.host); } |
207 | bool can (u32 host); |
213 | bool can (u32 host); |
208 | }; |
214 | }; |
209 | |
215 | |
210 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
216 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
211 | |
217 | |
… | |
… | |
214 | iterator i; |
220 | iterator i; |
215 | |
221 | |
216 | for (i = begin (); i != end (); ) |
222 | for (i = begin (); i != end (); ) |
217 | if (i->host == host) |
223 | if (i->host == host) |
218 | break; |
224 | break; |
219 | else if (i->last < NOW - EXPIRE) |
225 | else if (i->last < NOW - NRL_EXPIRE) |
220 | i = erase (i); |
226 | i = erase (i); |
221 | else |
227 | else |
222 | i++; |
228 | i++; |
223 | |
229 | |
224 | if (i == end ()) |
230 | if (i == end ()) |
225 | { |
231 | { |
226 | net_rateinfo ri; |
232 | net_rateinfo ri; |
227 | |
233 | |
228 | ri.host = host; |
234 | ri.host = host; |
229 | ri.pcnt = 1.; |
235 | ri.pcnt = 1.; |
230 | ri.diff = CUTOFF * (1. / (1. - ALPHA)); |
236 | ri.diff = NRL_MAXDIF; |
231 | ri.last = NOW; |
237 | ri.last = NOW; |
232 | |
238 | |
233 | push_front (ri); |
239 | push_front (ri); |
234 | |
240 | |
235 | return true; |
241 | return true; |
… | |
… | |
237 | else |
243 | else |
238 | { |
244 | { |
239 | net_rateinfo ri (*i); |
245 | net_rateinfo ri (*i); |
240 | erase (i); |
246 | erase (i); |
241 | |
247 | |
242 | ri.pcnt = ri.pcnt * ALPHA; |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
243 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
249 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
244 | |
250 | |
245 | ri.last = NOW; |
251 | ri.last = NOW; |
246 | |
252 | |
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|
253 | double dif = ri.diff / ri.pcnt; |
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254 | |
247 | bool send = ri.diff / ri.pcnt > CUTOFF; |
255 | bool send = dif > NRL_CUTOFF; |
248 | |
256 | |
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257 | if (dif > NRL_MAXDIF) |
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258 | { |
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259 | ri.pcnt = 1.; |
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260 | ri.diff = NRL_MAXDIF; |
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|
261 | } |
249 | if (send) |
262 | else if (send) |
250 | ri.pcnt++; |
263 | ri.pcnt++; |
251 | |
264 | |
252 | push_front (ri); |
265 | push_front (ri); |
253 | |
266 | |
254 | return send; |
267 | return send; |
… | |
… | |
285 | hmac_gen (ctx); |
298 | hmac_gen (ctx); |
286 | |
299 | |
287 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
300 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
288 | } |
301 | } |
289 | |
302 | |
290 | void vpn_packet::set_hdr (ptype type, unsigned int dst) |
303 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
291 | { |
304 | { |
292 | this->type = type; |
305 | type = type_; |
293 | |
306 | |
294 | int src = THISNODE->id; |
307 | int src = THISNODE->id; |
295 | |
308 | |
296 | src1 = src; |
309 | src1 = src; |
297 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
310 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
… | |
… | |
299 | } |
312 | } |
300 | |
313 | |
301 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
302 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
303 | |
316 | |
304 | struct vpndata_packet:vpn_packet |
317 | struct vpndata_packet : vpn_packet |
305 | { |
318 | { |
306 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
307 | |
320 | |
308 | 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); |
309 | tap_packet *unpack (connection *conn, u32 &seqno); |
322 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
322 | int outl = 0, outl2; |
335 | int outl = 0, outl2; |
323 | ptype type = PT_DATA_UNCOMPRESSED; |
336 | ptype type = PT_DATA_UNCOMPRESSED; |
324 | |
337 | |
325 | #if ENABLE_COMPRESSION |
338 | #if ENABLE_COMPRESSION |
326 | u8 cdata[MAX_MTU]; |
339 | u8 cdata[MAX_MTU]; |
327 | u32 cl; |
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|
328 | |
340 | |
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|
341 | if (conn->features & ENABLE_COMPRESSION) |
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|
342 | { |
329 | 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 | |
330 | if (cl) |
345 | if (cl) |
331 | { |
346 | { |
332 | type = PT_DATA_COMPRESSED; |
347 | type = PT_DATA_COMPRESSED; |
333 | d = cdata; |
348 | d = cdata; |
334 | l = cl + 2; |
349 | l = cl + 2; |
335 | |
350 | |
336 | d[0] = cl >> 8; |
351 | d[0] = cl >> 8; |
337 | d[1] = cl; |
352 | d[1] = cl; |
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|
353 | } |
338 | } |
354 | } |
339 | #endif |
355 | #endif |
340 | |
356 | |
341 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
357 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
342 | |
358 | |
343 | struct { |
359 | struct { |
344 | #if RAND_SIZE |
360 | #if RAND_SIZE |
345 | u8 rnd[RAND_SIZE]; |
361 | u8 rnd[RAND_SIZE]; |
346 | #endif |
362 | #endif |
… | |
… | |
350 | datahdr.seqno = ntohl (seqno); |
366 | datahdr.seqno = ntohl (seqno); |
351 | #if RAND_SIZE |
367 | #if RAND_SIZE |
352 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
368 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
353 | #endif |
369 | #endif |
354 | |
370 | |
355 | EVP_EncryptUpdate (cctx, |
371 | require (EVP_EncryptUpdate (cctx, |
356 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) data + outl, &outl2, |
357 | (unsigned char *) &datahdr, DATAHDR); |
373 | (unsigned char *) &datahdr, DATAHDR)); |
358 | outl += outl2; |
374 | outl += outl2; |
359 | |
375 | |
360 | EVP_EncryptUpdate (cctx, |
376 | require (EVP_EncryptUpdate (cctx, |
361 | (unsigned char *) data + outl, &outl2, |
377 | (unsigned char *) data + outl, &outl2, |
362 | (unsigned char *) d, l); |
378 | (unsigned char *) d, l)); |
363 | outl += outl2; |
379 | outl += outl2; |
364 | |
380 | |
365 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
381 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
366 | outl += outl2; |
382 | outl += outl2; |
367 | |
383 | |
368 | len = outl + data_hdr_size (); |
384 | len = outl + data_hdr_size (); |
369 | |
385 | |
370 | set_hdr (type, dst); |
386 | set_hdr (type, dst); |
… | |
… | |
379 | int outl = 0, outl2; |
395 | int outl = 0, outl2; |
380 | tap_packet *p = new tap_packet; |
396 | tap_packet *p = new tap_packet; |
381 | u8 *d; |
397 | u8 *d; |
382 | u32 l = len - data_hdr_size (); |
398 | u32 l = len - data_hdr_size (); |
383 | |
399 | |
384 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
400 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
385 | |
401 | |
386 | #if ENABLE_COMPRESSION |
402 | #if ENABLE_COMPRESSION |
387 | u8 cdata[MAX_MTU]; |
403 | u8 cdata[MAX_MTU]; |
388 | |
404 | |
389 | if (type == PT_DATA_COMPRESSED) |
405 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
391 | else |
407 | else |
392 | #endif |
408 | #endif |
393 | d = &(*p)[6 + 6 - DATAHDR]; |
409 | d = &(*p)[6 + 6 - DATAHDR]; |
394 | |
410 | |
395 | /* 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 */ |
396 | EVP_DecryptUpdate (cctx, |
412 | require (EVP_DecryptUpdate (cctx, |
397 | d, &outl2, |
413 | d, &outl2, |
398 | (unsigned char *)&data, len - data_hdr_size ()); |
414 | (unsigned char *)&data, len - data_hdr_size ())); |
399 | outl += outl2; |
415 | outl += outl2; |
400 | |
416 | |
401 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
417 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
402 | outl += outl2; |
418 | outl += outl2; |
403 | |
419 | |
404 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
420 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
405 | |
421 | |
406 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
422 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
435 | { |
451 | { |
436 | // actually, hmaclen cannot be checked because the hmac |
452 | // actually, hmaclen cannot be checked because the hmac |
437 | // field comes before this data, so peers with other |
453 | // field comes before this data, so peers with other |
438 | // hmacs simply will not work. |
454 | // hmacs simply will not work. |
439 | u8 prot_major, prot_minor, randsize, hmaclen; |
455 | u8 prot_major, prot_minor, randsize, hmaclen; |
440 | u8 flags, challengelen, pad2, pad3; |
456 | u8 flags, challengelen, features, pad3; |
441 | u32 cipher_nid, digest_nid, hmac_nid; |
457 | u32 cipher_nid, digest_nid, hmac_nid; |
442 | |
|
|
443 | const u8 curflags () const |
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|
444 | { |
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|
445 | return 0x80 |
|
|
446 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
447 | } |
|
|
448 | |
458 | |
449 | void setup (ptype type, int dst); |
459 | void setup (ptype type, int dst); |
450 | bool chk_config () const; |
460 | bool chk_config () const; |
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|
461 | |
|
|
462 | static u8 get_features () |
|
|
463 | { |
|
|
464 | u8 f = 0; |
|
|
465 | #if ENABLE_COMPRESSION |
|
|
466 | f |= FEATURE_COMPRESSION; |
|
|
467 | #endif |
|
|
468 | #if ENABLE_ROHC |
|
|
469 | f |= FEATURE_ROHC; |
|
|
470 | #endif |
|
|
471 | return f; |
|
|
472 | } |
451 | }; |
473 | }; |
452 | |
474 | |
453 | void config_packet::setup (ptype type, int dst) |
475 | void config_packet::setup (ptype type, int dst) |
454 | { |
476 | { |
455 | prot_major = PROTOCOL_MAJOR; |
477 | prot_major = PROTOCOL_MAJOR; |
456 | prot_minor = PROTOCOL_MINOR; |
478 | prot_minor = PROTOCOL_MINOR; |
457 | randsize = RAND_SIZE; |
479 | randsize = RAND_SIZE; |
458 | hmaclen = HMACLENGTH; |
480 | hmaclen = HMACLENGTH; |
459 | flags = curflags (); |
481 | flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
460 | challengelen = sizeof (rsachallenge); |
482 | challengelen = sizeof (rsachallenge); |
|
|
483 | features = get_features (); |
461 | |
484 | |
462 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
485 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
463 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
486 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
464 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
487 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
465 | |
488 | |
… | |
… | |
467 | set_hdr (type, dst); |
490 | set_hdr (type, dst); |
468 | } |
491 | } |
469 | |
492 | |
470 | bool config_packet::chk_config () const |
493 | bool config_packet::chk_config () const |
471 | { |
494 | { |
472 | return prot_major == PROTOCOL_MAJOR |
495 | if (prot_major != PROTOCOL_MAJOR) |
473 | && randsize == RAND_SIZE |
496 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
474 | && hmaclen == HMACLENGTH |
497 | else if (randsize != RAND_SIZE) |
475 | && flags == curflags () |
498 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
|
|
499 | else if (hmaclen != HMACLENGTH) |
|
|
500 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
501 | #if 0 // this implementation should handle all flag settings |
|
|
502 | else if (flags != curflags ()) |
|
|
503 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
|
|
504 | #endif |
476 | && challengelen == sizeof (rsachallenge) |
505 | else if (challengelen != sizeof (rsachallenge)) |
|
|
506 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
477 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
507 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
|
|
508 | 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)) |
509 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
|
|
510 | 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)); |
511 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
|
|
512 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
|
|
513 | else |
|
|
514 | return true; |
|
|
515 | |
|
|
516 | return false; |
480 | } |
517 | } |
481 | |
518 | |
482 | struct auth_req_packet : config_packet |
519 | struct auth_req_packet : config_packet |
483 | { |
520 | { |
484 | char magic[8]; |
521 | char magic[8]; |
485 | u8 initiate; // false if this is just an automatic reply |
522 | u8 initiate; // false if this is just an automatic reply |
486 | u8 protocols; // supported protocols (will get patches on forward) |
523 | u8 protocols; // supported protocols (will be patched on forward) |
487 | u8 pad2, pad3; |
524 | u8 pad2, pad3; |
488 | rsaid id; |
525 | rsaid id; |
489 | rsaencrdata encr; |
526 | rsaencrdata encr; |
490 | |
527 | |
491 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
528 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
546 | }; |
583 | }; |
547 | |
584 | |
548 | ///////////////////////////////////////////////////////////////////////////// |
585 | ///////////////////////////////////////////////////////////////////////////// |
549 | |
586 | |
550 | void |
587 | void |
|
|
588 | connection::connection_established () |
|
|
589 | { |
|
|
590 | if (ictx && octx) |
|
|
591 | { |
|
|
592 | connectmode = conf->connectmode; |
|
|
593 | |
|
|
594 | // make sure rekeying timeouts are slightly asymmetric |
|
|
595 | rekey.start (NOW + ::conf.rekey |
|
|
596 | + (conf->id > THISNODE->id ? 10 : 0)); |
|
|
597 | keepalive.start (NOW + ::conf.keepalive); |
|
|
598 | |
|
|
599 | // send queued packets |
|
|
600 | if (ictx && octx) |
|
|
601 | { |
|
|
602 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
|
|
603 | { |
|
|
604 | send_data_packet (p); |
|
|
605 | delete p; |
|
|
606 | } |
|
|
607 | |
|
|
608 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
609 | { |
|
|
610 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
611 | delete p; |
|
|
612 | } |
|
|
613 | } |
|
|
614 | } |
|
|
615 | else |
|
|
616 | { |
|
|
617 | retry_cnt = 0; |
|
|
618 | establish_connection.start (NOW + 5); |
|
|
619 | keepalive.stop (); |
|
|
620 | rekey.stop (); |
|
|
621 | } |
|
|
622 | } |
|
|
623 | |
|
|
624 | void |
551 | connection::reset_dstaddr () |
625 | connection::reset_si () |
552 | { |
626 | { |
553 | si.set (conf); |
|
|
554 | } |
|
|
555 | |
|
|
556 | void |
|
|
557 | connection::send_ping (const sockinfo &si, u8 pong) |
|
|
558 | { |
|
|
559 | ping_packet *pkt = new ping_packet; |
|
|
560 | |
|
|
561 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
562 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
|
|
563 | |
|
|
564 | delete pkt; |
|
|
565 | } |
|
|
566 | |
|
|
567 | void |
|
|
568 | connection::send_reset (const sockinfo &si) |
|
|
569 | { |
|
|
570 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
|
|
571 | { |
|
|
572 | config_packet *pkt = new config_packet; |
|
|
573 | |
|
|
574 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
|
|
575 | send_vpn_packet (pkt, si, IPTOS_MINCOST); |
|
|
576 | |
|
|
577 | delete pkt; |
|
|
578 | } |
|
|
579 | } |
|
|
580 | |
|
|
581 | void |
|
|
582 | connection::send_auth_request (const sockinfo &si, bool initiate) |
|
|
583 | { |
|
|
584 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
|
|
585 | |
|
|
586 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
627 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
587 | |
628 | |
588 | // mask out protocols we cannot establish |
629 | // mask out protocols we cannot establish |
589 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
630 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
590 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
631 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
591 | |
632 | |
592 | if (protocol) |
633 | si.set (conf, protocol); |
|
|
634 | } |
|
|
635 | |
|
|
636 | // ensure sockinfo is valid, forward if necessary |
|
|
637 | const sockinfo & |
|
|
638 | connection::forward_si (const sockinfo &si) const |
|
|
639 | { |
|
|
640 | if (!si.valid ()) |
|
|
641 | { |
|
|
642 | connection *r = vpn->find_router (); |
|
|
643 | |
|
|
644 | if (r) |
|
|
645 | { |
|
|
646 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
|
|
647 | conf->nodename, r->conf->nodename); |
|
|
648 | return r->si; |
|
|
649 | } |
|
|
650 | else |
|
|
651 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
|
|
652 | conf->nodename); |
593 | { |
653 | } |
594 | rsachallenge chg; |
|
|
595 | |
654 | |
596 | rsa_cache.gen (pkt->id, chg); |
655 | return si; |
|
|
656 | } |
597 | |
657 | |
598 | if (0 > RSA_public_encrypt (sizeof chg, |
658 | void |
599 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
659 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
600 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
660 | { |
601 | fatal ("RSA_public_encrypt error"); |
661 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
|
|
662 | reset_connection (); |
|
|
663 | } |
602 | |
664 | |
603 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
665 | void |
|
|
666 | connection::send_ping (const sockinfo &si, u8 pong) |
|
|
667 | { |
|
|
668 | ping_packet *pkt = new ping_packet; |
604 | |
669 | |
605 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
670 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
671 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
|
|
672 | |
|
|
673 | delete pkt; |
|
|
674 | } |
|
|
675 | |
|
|
676 | void |
|
|
677 | connection::send_reset (const sockinfo &si) |
|
|
678 | { |
|
|
679 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
|
|
680 | { |
|
|
681 | config_packet *pkt = new config_packet; |
|
|
682 | |
|
|
683 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
|
|
684 | send_vpn_packet (pkt, si, IPTOS_MINCOST); |
606 | |
685 | |
607 | delete pkt; |
686 | delete pkt; |
608 | } |
687 | } |
609 | else |
688 | } |
610 | ; // silently fail |
689 | |
|
|
690 | void |
|
|
691 | connection::send_auth_request (const sockinfo &si, bool initiate) |
|
|
692 | { |
|
|
693 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
|
|
694 | |
|
|
695 | rsachallenge chg; |
|
|
696 | rsa_cache.gen (pkt->id, chg); |
|
|
697 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
|
|
698 | |
|
|
699 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
|
|
700 | |
|
|
701 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
|
|
702 | |
|
|
703 | delete pkt; |
611 | } |
704 | } |
612 | |
705 | |
613 | void |
706 | void |
614 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
707 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
615 | { |
708 | { |
… | |
… | |
641 | |
734 | |
642 | delete r; |
735 | delete r; |
643 | } |
736 | } |
644 | |
737 | |
645 | void |
738 | void |
646 | connection::establish_connection_cb (tstamp &ts) |
739 | connection::establish_connection_cb (time_watcher &w) |
647 | { |
740 | { |
648 | if (ictx || conf == THISNODE |
741 | if (!ictx |
|
|
742 | && conf != THISNODE |
649 | || connectmode == conf_node::C_NEVER |
743 | && connectmode != conf_node::C_NEVER |
650 | || connectmode == conf_node::C_DISABLED) |
744 | && connectmode != conf_node::C_DISABLED |
651 | ts = TSTAMP_CANCEL; |
745 | && NOW > w.at) |
652 | else if (ts <= NOW) |
|
|
653 | { |
746 | { |
654 | 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; |
655 | |
748 | |
656 | if (retry_int < 3600 * 8) |
749 | if (retry_int < 3600 * 8) |
657 | retry_cnt++; |
750 | retry_cnt++; |
658 | |
751 | |
659 | ts = NOW + retry_int; |
752 | w.start (NOW + retry_int); |
660 | |
753 | |
661 | if (conf->hostname) |
754 | reset_si (); |
|
|
755 | |
|
|
756 | if (si.prot && !si.host) |
|
|
757 | vpn->send_connect_request (conf->id); |
|
|
758 | else |
662 | { |
759 | { |
663 | reset_dstaddr (); |
760 | const sockinfo &dsi = forward_si (si); |
|
|
761 | |
664 | if (si.host && auth_rate_limiter.can (si)) |
762 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
665 | { |
763 | { |
666 | if (retry_cnt < 4) |
764 | if (retry_cnt < 4) |
667 | send_auth_request (si, true); |
765 | send_auth_request (dsi, true); |
668 | else |
766 | else |
669 | send_ping (si, 0); |
767 | send_ping (dsi, 0); |
670 | } |
768 | } |
671 | } |
769 | } |
672 | else |
|
|
673 | vpn->connect_request (conf->id); |
|
|
674 | } |
770 | } |
675 | } |
771 | } |
676 | |
772 | |
677 | void |
773 | void |
678 | connection::reset_connection () |
774 | connection::reset_connection () |
… | |
… | |
692 | si.host= 0; |
788 | si.host= 0; |
693 | |
789 | |
694 | last_activity = 0; |
790 | last_activity = 0; |
695 | retry_cnt = 0; |
791 | retry_cnt = 0; |
696 | |
792 | |
697 | rekey.reset (); |
793 | rekey.stop (); |
698 | keepalive.reset (); |
794 | keepalive.stop (); |
699 | establish_connection.reset (); |
795 | establish_connection.stop (); |
700 | } |
796 | } |
701 | |
797 | |
702 | void |
798 | void |
703 | connection::shutdown () |
799 | connection::shutdown () |
704 | { |
800 | { |
… | |
… | |
707 | |
803 | |
708 | reset_connection (); |
804 | reset_connection (); |
709 | } |
805 | } |
710 | |
806 | |
711 | void |
807 | void |
712 | connection::rekey_cb (tstamp &ts) |
808 | connection::rekey_cb (time_watcher &w) |
713 | { |
809 | { |
714 | ts = TSTAMP_CANCEL; |
|
|
715 | |
|
|
716 | reset_connection (); |
810 | reset_connection (); |
717 | establish_connection (); |
811 | establish_connection (); |
718 | } |
812 | } |
719 | |
813 | |
720 | void |
814 | void |
721 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
815 | connection::send_data_packet (tap_packet *pkt) |
722 | { |
816 | { |
723 | vpndata_packet *p = new vpndata_packet; |
817 | vpndata_packet *p = new vpndata_packet; |
724 | int tos = 0; |
818 | int tos = 0; |
725 | |
819 | |
726 | if (conf->inherit_tos |
820 | // I am not hilarious about peeking into packets, but so be it. |
727 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
821 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
728 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
729 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
822 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
730 | |
823 | |
731 | 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 |
732 | send_vpn_packet (p, si, tos); |
825 | send_vpn_packet (p, si, tos); |
733 | |
826 | |
734 | delete p; |
827 | delete p; |
735 | |
828 | |
736 | if (oseqno > MAX_SEQNO) |
829 | if (oseqno > MAX_SEQNO) |
737 | rekey (); |
830 | rekey (); |
738 | } |
831 | } |
739 | |
832 | |
740 | void |
833 | void |
741 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
834 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
742 | { |
835 | { |
743 | if (ictx && octx) |
836 | if (ictx && octx) |
744 | send_data_packet (pkt, broadcast); |
837 | send_data_packet (pkt); |
745 | else |
838 | else |
746 | { |
839 | { |
747 | if (!broadcast)//DDDD |
840 | if (!broadcast)//DDDD |
748 | queue.put (new tap_packet (*pkt)); |
841 | data_queue.put (new tap_packet (*pkt)); |
|
|
842 | |
|
|
843 | establish_connection (); |
|
|
844 | } |
|
|
845 | } |
|
|
846 | |
|
|
847 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
|
|
848 | { |
|
|
849 | if (ictx && octx) |
|
|
850 | send_vpn_packet (pkt, si, tos); |
|
|
851 | else |
|
|
852 | { |
|
|
853 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
749 | |
854 | |
750 | establish_connection (); |
855 | establish_connection (); |
751 | } |
856 | } |
752 | } |
857 | } |
753 | |
858 | |
… | |
… | |
812 | if (p->initiate) |
917 | if (p->initiate) |
813 | send_auth_request (rsi, false); |
918 | send_auth_request (rsi, false); |
814 | |
919 | |
815 | rsachallenge k; |
920 | rsachallenge k; |
816 | |
921 | |
817 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
922 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
818 | (unsigned char *)&p->encr, (unsigned char *)&k, |
923 | { |
819 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
820 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
924 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
821 | conf->nodename, (const char *)rsi); |
925 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
926 | break; |
|
|
927 | } |
822 | else |
928 | else |
823 | { |
929 | { |
824 | retry_cnt = 0; |
|
|
825 | establish_connection.set (NOW + 8); //? ;) |
|
|
826 | keepalive.reset (); |
|
|
827 | rekey.reset (); |
|
|
828 | |
|
|
829 | delete ictx; |
|
|
830 | ictx = 0; |
|
|
831 | |
|
|
832 | delete octx; |
930 | delete octx; |
833 | |
931 | |
834 | octx = new crypto_ctx (k, 1); |
932 | octx = new crypto_ctx (k, 1); |
835 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
933 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
836 | |
934 | |
|
|
935 | // compatibility code, remove when no longer required |
|
|
936 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
937 | |
837 | conf->protocols = p->protocols; |
938 | conf->protocols = p->protocols; |
|
|
939 | features = p->features & config_packet::get_features (); |
|
|
940 | |
838 | send_auth_response (rsi, p->id, k); |
941 | send_auth_response (rsi, p->id, k); |
|
|
942 | |
|
|
943 | connection_established (); |
839 | |
944 | |
840 | break; |
945 | break; |
841 | } |
946 | } |
842 | } |
947 | } |
|
|
948 | else |
|
|
949 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
|
|
950 | conf->nodename, (const char *)rsi); |
843 | |
951 | |
844 | send_reset (rsi); |
952 | send_reset (rsi); |
845 | } |
953 | } |
846 | |
954 | |
847 | break; |
955 | break; |
… | |
… | |
860 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
968 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
861 | |
969 | |
862 | rsachallenge chg; |
970 | rsachallenge chg; |
863 | |
971 | |
864 | if (!rsa_cache.find (p->id, chg)) |
972 | if (!rsa_cache.find (p->id, chg)) |
|
|
973 | { |
865 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
974 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
866 | conf->nodename, (const char *)rsi); |
975 | conf->nodename, (const char *)rsi); |
|
|
976 | break; |
|
|
977 | } |
867 | else |
978 | else |
868 | { |
979 | { |
869 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
980 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
870 | |
981 | |
871 | if (!p->hmac_chk (cctx)) |
982 | if (!p->hmac_chk (cctx)) |
|
|
983 | { |
872 | 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" |
873 | "could be an attack, or just corruption or an synchronization error"), |
985 | "could be an attack, or just corruption or a synchronization error"), |
874 | conf->nodename, (const char *)rsi); |
986 | conf->nodename, (const char *)rsi); |
|
|
987 | break; |
|
|
988 | } |
875 | else |
989 | else |
876 | { |
990 | { |
877 | rsaresponse h; |
991 | rsaresponse h; |
878 | |
992 | |
879 | rsa_hash (p->id, chg, h); |
993 | rsa_hash (p->id, chg, h); |
… | |
… | |
885 | delete ictx; ictx = cctx; |
999 | delete ictx; ictx = cctx; |
886 | |
1000 | |
887 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1001 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
888 | |
1002 | |
889 | si = rsi; |
1003 | si = rsi; |
|
|
1004 | protocol = rsi.prot; |
890 | |
1005 | |
891 | rekey.set (NOW + ::conf.rekey); |
1006 | connection_established (); |
892 | keepalive.set (NOW + ::conf.keepalive); |
|
|
893 | |
1007 | |
894 | // send queued packets |
|
|
895 | while (tap_packet *p = queue.get ()) |
|
|
896 | { |
|
|
897 | send_data_packet (p); |
|
|
898 | delete p; |
|
|
899 | } |
|
|
900 | |
|
|
901 | connectmode = conf->connectmode; |
|
|
902 | |
|
|
903 | slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"), |
1008 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
904 | conf->nodename, (const char *)rsi, |
1009 | conf->nodename, (const char *)rsi, |
905 | strprotocol (protocol), |
|
|
906 | p->prot_major, p->prot_minor); |
1010 | p->prot_major, p->prot_minor); |
907 | |
1011 | |
908 | if (::conf.script_node_up) |
1012 | if (::conf.script_node_up) |
909 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1013 | run_script (run_script_cb (this, &connection::script_node_up), false); |
910 | |
1014 | |
… | |
… | |
933 | |
1037 | |
934 | if (ictx && octx) |
1038 | if (ictx && octx) |
935 | { |
1039 | { |
936 | vpndata_packet *p = (vpndata_packet *)pkt; |
1040 | vpndata_packet *p = (vpndata_packet *)pkt; |
937 | |
1041 | |
938 | if (rsi == si) |
1042 | if (!p->hmac_chk (ictx)) |
|
|
1043 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
1044 | "could be an attack, or just corruption or a synchronization error"), |
|
|
1045 | conf->nodename, (const char *)rsi); |
|
|
1046 | else |
939 | { |
1047 | { |
940 | if (!p->hmac_chk (ictx)) |
|
|
941 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
942 | "could be an attack, or just corruption or an synchronization error"), |
|
|
943 | conf->nodename, (const char *)rsi); |
|
|
944 | else |
1048 | u32 seqno; |
|
|
1049 | tap_packet *d = p->unpack (this, seqno); |
|
|
1050 | |
|
|
1051 | if (iseqno.recv_ok (seqno)) |
945 | { |
1052 | { |
946 | u32 seqno; |
1053 | vpn->tap->send (d); |
947 | tap_packet *d = p->unpack (this, seqno); |
|
|
948 | |
1054 | |
949 | if (iseqno.recv_ok (seqno)) |
1055 | if (si != rsi) |
950 | { |
1056 | { |
951 | vpn->tap->send (d); |
1057 | // fast re-sync on connection changes, useful especially for tcp/ip |
952 | |
|
|
953 | if (p->dst () == 0) // re-broadcast |
|
|
954 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
955 | { |
|
|
956 | connection *c = *i; |
|
|
957 | |
|
|
958 | if (c->conf != THISNODE && c->conf != conf) |
|
|
959 | c->inject_data_packet (d); |
|
|
960 | } |
|
|
961 | |
|
|
962 | delete d; |
|
|
963 | |
|
|
964 | break; |
1058 | si = rsi; |
|
|
1059 | |
|
|
1060 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
|
|
1061 | conf->nodename, (const char *)si, (const char *)rsi); |
965 | } |
1062 | } |
966 | } |
1063 | } |
|
|
1064 | |
|
|
1065 | delete d; |
|
|
1066 | break; |
967 | } |
1067 | } |
968 | else |
|
|
969 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi); |
|
|
970 | } |
1068 | } |
971 | |
1069 | |
972 | send_reset (rsi); |
1070 | send_reset (rsi); |
973 | break; |
1071 | break; |
974 | |
1072 | |
… | |
… | |
976 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1074 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
977 | { |
1075 | { |
978 | connect_req_packet *p = (connect_req_packet *) pkt; |
1076 | connect_req_packet *p = (connect_req_packet *) pkt; |
979 | |
1077 | |
980 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1078 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
|
|
1079 | connection *c = vpn->conns[p->id - 1]; |
981 | conf->protocols = p->protocols; |
1080 | conf->protocols = p->protocols; |
982 | connection *c = vpn->conns[p->id - 1]; |
|
|
983 | |
1081 | |
984 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1082 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
985 | conf->id, p->id, c->ictx && c->octx); |
1083 | conf->id, p->id, c->ictx && c->octx); |
986 | |
1084 | |
987 | if (c->ictx && c->octx) |
1085 | if (c->ictx && c->octx) |
… | |
… | |
989 | // send connect_info packets to both sides, in case one is |
1087 | // send connect_info packets to both sides, in case one is |
990 | // behind a nat firewall (or both ;) |
1088 | // behind a nat firewall (or both ;) |
991 | c->send_connect_info (conf->id, si, conf->protocols); |
1089 | c->send_connect_info (conf->id, si, conf->protocols); |
992 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1090 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
993 | } |
1091 | } |
|
|
1092 | else |
|
|
1093 | c->establish_connection (); |
994 | } |
1094 | } |
995 | |
1095 | |
996 | break; |
1096 | break; |
997 | |
1097 | |
998 | case vpn_packet::PT_CONNECT_INFO: |
1098 | case vpn_packet::PT_CONNECT_INFO: |
999 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1099 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1000 | { |
1100 | { |
1001 | connect_info_packet *p = (connect_info_packet *) pkt; |
1101 | connect_info_packet *p = (connect_info_packet *) pkt; |
1002 | |
1102 | |
1003 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1103 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1004 | conf->protocols = p->protocols; |
1104 | |
1005 | connection *c = vpn->conns[p->id - 1]; |
1105 | connection *c = vpn->conns[p->id - 1]; |
|
|
1106 | |
|
|
1107 | c->conf->protocols = p->protocols; |
|
|
1108 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
|
|
1109 | p->si.upgrade_protocol (protocol, c->conf); |
1006 | |
1110 | |
1007 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1111 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1008 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1112 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1009 | |
1113 | |
|
|
1114 | const sockinfo &dsi = forward_si (p->si); |
|
|
1115 | |
|
|
1116 | if (dsi.valid ()) |
1010 | c->send_auth_request (p->si, true); |
1117 | c->send_auth_request (dsi, true); |
1011 | } |
1118 | } |
1012 | |
1119 | |
1013 | break; |
1120 | break; |
1014 | |
1121 | |
1015 | default: |
1122 | default: |
1016 | send_reset (rsi); |
1123 | send_reset (rsi); |
1017 | break; |
1124 | break; |
1018 | } |
1125 | } |
1019 | } |
1126 | } |
1020 | |
1127 | |
1021 | void connection::keepalive_cb (tstamp &ts) |
1128 | void connection::keepalive_cb (time_watcher &w) |
1022 | { |
1129 | { |
1023 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1130 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1024 | { |
1131 | { |
1025 | reset_connection (); |
1132 | reset_connection (); |
1026 | establish_connection (); |
1133 | establish_connection (); |
1027 | } |
1134 | } |
1028 | else if (NOW < last_activity + ::conf.keepalive) |
1135 | else if (NOW < last_activity + ::conf.keepalive) |
1029 | ts = last_activity + ::conf.keepalive; |
1136 | w.start (last_activity + ::conf.keepalive); |
1030 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1137 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1031 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1138 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1032 | { |
1139 | { |
1033 | send_ping (si); |
1140 | send_ping (si); |
1034 | ts = NOW + 5; |
1141 | w.start (NOW + 5); |
1035 | } |
1142 | } |
|
|
1143 | else if (NOW < last_activity + ::conf.keepalive + 10) |
|
|
1144 | // hold ondemand connections implicitly a few seconds longer |
|
|
1145 | // should delete octx, though, or something like that ;) |
|
|
1146 | w.start (last_activity + ::conf.keepalive + 10); |
1036 | else |
1147 | else |
1037 | reset_connection (); |
1148 | reset_connection (); |
1038 | } |
1149 | } |
1039 | |
1150 | |
1040 | void connection::connect_request (int id) |
1151 | void connection::send_connect_request (int id) |
1041 | { |
1152 | { |
1042 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1153 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1043 | |
1154 | |
1044 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1155 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1045 | p->hmac_set (octx); |
1156 | p->hmac_set (octx); |
… | |
… | |
1075 | putenv ("STATE=down"); |
1186 | putenv ("STATE=down"); |
1076 | |
1187 | |
1077 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1188 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1078 | } |
1189 | } |
1079 | |
1190 | |
1080 | // send a vpn packet out to other hosts |
|
|
1081 | void |
|
|
1082 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
1083 | { |
|
|
1084 | switch (protocol) |
|
|
1085 | { |
|
|
1086 | case PROT_IPv4: |
|
|
1087 | vpn->send_ipv4_packet (pkt, si, tos); |
|
|
1088 | break; |
|
|
1089 | |
|
|
1090 | case PROT_UDPv4: |
|
|
1091 | vpn->send_udpv4_packet (pkt, si, tos); |
|
|
1092 | break; |
|
|
1093 | |
|
|
1094 | case PROT_TCPv4: |
|
|
1095 | vpn->send_tcpv4_packet (pkt, si, tos); |
|
|
1096 | break; |
|
|
1097 | } |
|
|
1098 | } |
|
|
1099 | |
|
|
1100 | connection::connection(struct vpn *vpn_) |
1191 | connection::connection(struct vpn *vpn_) |
1101 | : vpn(vpn_) |
1192 | : vpn(vpn_) |
1102 | , rekey (this, &connection::rekey_cb) |
1193 | , rekey (this, &connection::rekey_cb) |
1103 | , keepalive (this, &connection::keepalive_cb) |
1194 | , keepalive (this, &connection::keepalive_cb) |
1104 | , establish_connection (this, &connection::establish_connection_cb) |
1195 | , establish_connection (this, &connection::establish_connection_cb) |