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> |
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25 | |
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26 | #include <openssl/rand.h> |
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27 | #include <openssl/evp.h> |
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28 | #include <openssl/rsa.h> |
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29 | #include <openssl/err.h> |
26 | |
30 | |
27 | #include "gettext.h" |
31 | #include "gettext.h" |
28 | |
32 | |
29 | #include "conf.h" |
33 | #include "conf.h" |
30 | #include "slog.h" |
34 | #include "slog.h" |
31 | #include "device.h" |
35 | #include "device.h" |
32 | #include "protocol.h" |
36 | #include "vpn.h" |
33 | #include "connection.h" |
37 | #include "connection.h" |
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38 | |
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39 | #include "netcompat.h" |
34 | |
40 | |
35 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | #if !HAVE_RAND_PSEUDO_BYTES |
36 | # define RAND_pseudo_bytes RAND_bytes |
42 | # define RAND_pseudo_bytes RAND_bytes |
37 | #endif |
43 | #endif |
38 | |
44 | |
39 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
40 | |
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 | |
41 | struct crypto_ctx |
53 | struct crypto_ctx |
42 | { |
54 | { |
43 | EVP_CIPHER_CTX cctx; |
55 | EVP_CIPHER_CTX cctx; |
44 | HMAC_CTX hctx; |
56 | HMAC_CTX hctx; |
45 | |
57 | |
… | |
… | |
48 | }; |
60 | }; |
49 | |
61 | |
50 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
62 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
51 | { |
63 | { |
52 | EVP_CIPHER_CTX_init (&cctx); |
64 | EVP_CIPHER_CTX_init (&cctx); |
53 | 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)); |
54 | HMAC_CTX_init (&hctx); |
66 | HMAC_CTX_init (&hctx); |
55 | 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); |
56 | } |
68 | } |
57 | |
69 | |
58 | crypto_ctx::~crypto_ctx () |
70 | crypto_ctx::~crypto_ctx () |
59 | { |
71 | { |
60 | EVP_CIPHER_CTX_cleanup (&cctx); |
72 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
61 | HMAC_CTX_cleanup (&hctx); |
73 | HMAC_CTX_cleanup (&hctx); |
62 | } |
74 | } |
63 | |
75 | |
64 | static void |
76 | static void |
65 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
77 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
66 | { |
78 | { |
67 | EVP_MD_CTX ctx; |
79 | EVP_MD_CTX ctx; |
68 | |
80 | |
69 | EVP_MD_CTX_init (&ctx); |
81 | EVP_MD_CTX_init (&ctx); |
70 | EVP_DigestInit (&ctx, RSA_HASH); |
82 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
71 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
83 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
72 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
84 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
73 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
85 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
74 | EVP_MD_CTX_cleanup (&ctx); |
86 | EVP_MD_CTX_cleanup (&ctx); |
75 | } |
87 | } |
76 | |
88 | |
77 | struct rsa_entry { |
89 | struct rsa_entry { |
78 | tstamp expire; |
90 | tstamp expire; |
… | |
… | |
80 | rsachallenge chg; |
92 | rsachallenge chg; |
81 | }; |
93 | }; |
82 | |
94 | |
83 | struct rsa_cache : list<rsa_entry> |
95 | struct rsa_cache : list<rsa_entry> |
84 | { |
96 | { |
85 | void cleaner_cb (tstamp &ts); time_watcher cleaner; |
97 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
86 | |
98 | |
87 | bool find (const rsaid &id, rsachallenge &chg) |
99 | bool find (const rsaid &id, rsachallenge &chg) |
88 | { |
100 | { |
89 | for (iterator i = begin (); i != end (); ++i) |
101 | for (iterator i = begin (); i != end (); ++i) |
90 | { |
102 | { |
… | |
… | |
124 | : cleaner (this, &rsa_cache::cleaner_cb) |
136 | : cleaner (this, &rsa_cache::cleaner_cb) |
125 | { } |
137 | { } |
126 | |
138 | |
127 | } rsa_cache; |
139 | } rsa_cache; |
128 | |
140 | |
129 | void rsa_cache::cleaner_cb (tstamp &ts) |
141 | void rsa_cache::cleaner_cb (time_watcher &w) |
130 | { |
142 | { |
131 | if (empty ()) |
143 | if (!empty ()) |
132 | ts = TSTAMP_CANCEL; |
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133 | else |
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134 | { |
144 | { |
135 | ts = NOW + RSA_TTL; |
145 | w.start (NOW + RSA_TTL); |
136 | |
146 | |
137 | for (iterator i = begin (); i != end (); ) |
147 | for (iterator i = begin (); i != end (); ) |
138 | if (i->expire <= NOW) |
148 | if (i->expire <= NOW) |
139 | i = erase (i); |
149 | i = erase (i); |
140 | else |
150 | else |
… | |
… | |
142 | } |
152 | } |
143 | } |
153 | } |
144 | |
154 | |
145 | ////////////////////////////////////////////////////////////////////////////// |
155 | ////////////////////////////////////////////////////////////////////////////// |
146 | |
156 | |
147 | void pkt_queue::put (tap_packet *p) |
157 | void pkt_queue::put (net_packet *p) |
148 | { |
158 | { |
149 | if (queue[i]) |
159 | if (queue[i]) |
150 | { |
160 | { |
151 | delete queue[i]; |
161 | delete queue[i]; |
152 | j = (j + 1) % QUEUEDEPTH; |
162 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
155 | queue[i] = p; |
165 | queue[i] = p; |
156 | |
166 | |
157 | i = (i + 1) % QUEUEDEPTH; |
167 | i = (i + 1) % QUEUEDEPTH; |
158 | } |
168 | } |
159 | |
169 | |
160 | tap_packet *pkt_queue::get () |
170 | net_packet *pkt_queue::get () |
161 | { |
171 | { |
162 | tap_packet *p = queue[j]; |
172 | net_packet *p = queue[j]; |
163 | |
173 | |
164 | if (p) |
174 | if (p) |
165 | { |
175 | { |
166 | queue[j] = 0; |
176 | queue[j] = 0; |
167 | j = (j + 1) % QUEUEDEPTH; |
177 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
192 | // 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. |
193 | // this implementation ("splay list" ;) is inefficient, |
203 | // this implementation ("splay list" ;) is inefficient, |
194 | // but low on resources. |
204 | // but low on resources. |
195 | struct net_rate_limiter : list<net_rateinfo> |
205 | struct net_rate_limiter : list<net_rateinfo> |
196 | { |
206 | { |
197 | static const double ALPHA = 1. - 1. / 90.; // allow bursts |
207 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
198 | static const double CUTOFF = 20.; // one event every CUTOFF seconds |
208 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
199 | 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 |
200 | |
211 | |
201 | bool can (const sockinfo &si) { return can((u32)si.host); } |
212 | bool can (const sockinfo &si) { return can((u32)si.host); } |
202 | bool can (u32 host); |
213 | bool can (u32 host); |
203 | }; |
214 | }; |
204 | |
215 | |
205 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
216 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
206 | |
217 | |
… | |
… | |
209 | iterator i; |
220 | iterator i; |
210 | |
221 | |
211 | for (i = begin (); i != end (); ) |
222 | for (i = begin (); i != end (); ) |
212 | if (i->host == host) |
223 | if (i->host == host) |
213 | break; |
224 | break; |
214 | else if (i->last < NOW - EXPIRE) |
225 | else if (i->last < NOW - NRL_EXPIRE) |
215 | i = erase (i); |
226 | i = erase (i); |
216 | else |
227 | else |
217 | i++; |
228 | i++; |
218 | |
229 | |
219 | if (i == end ()) |
230 | if (i == end ()) |
220 | { |
231 | { |
221 | net_rateinfo ri; |
232 | net_rateinfo ri; |
222 | |
233 | |
223 | ri.host = host; |
234 | ri.host = host; |
224 | ri.pcnt = 1.; |
235 | ri.pcnt = 1.; |
225 | ri.diff = CUTOFF * (1. / (1. - ALPHA)); |
236 | ri.diff = NRL_MAXDIF; |
226 | ri.last = NOW; |
237 | ri.last = NOW; |
227 | |
238 | |
228 | push_front (ri); |
239 | push_front (ri); |
229 | |
240 | |
230 | return true; |
241 | return true; |
… | |
… | |
232 | else |
243 | else |
233 | { |
244 | { |
234 | net_rateinfo ri (*i); |
245 | net_rateinfo ri (*i); |
235 | erase (i); |
246 | erase (i); |
236 | |
247 | |
237 | ri.pcnt = ri.pcnt * ALPHA; |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
238 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
249 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
239 | |
250 | |
240 | ri.last = NOW; |
251 | ri.last = NOW; |
241 | |
252 | |
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253 | double dif = ri.diff / ri.pcnt; |
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254 | |
242 | bool send = ri.diff / ri.pcnt > CUTOFF; |
255 | bool send = dif > NRL_CUTOFF; |
243 | |
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 | } |
244 | if (send) |
262 | else if (send) |
245 | ri.pcnt++; |
263 | ri.pcnt++; |
246 | |
264 | |
247 | push_front (ri); |
265 | push_front (ri); |
248 | |
266 | |
249 | return send; |
267 | return send; |
… | |
… | |
280 | hmac_gen (ctx); |
298 | hmac_gen (ctx); |
281 | |
299 | |
282 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
300 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
283 | } |
301 | } |
284 | |
302 | |
285 | void vpn_packet::set_hdr (ptype type, unsigned int dst) |
303 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
286 | { |
304 | { |
287 | this->type = type; |
305 | type = type_; |
288 | |
306 | |
289 | int src = THISNODE->id; |
307 | int src = THISNODE->id; |
290 | |
308 | |
291 | src1 = src; |
309 | src1 = src; |
292 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
310 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
… | |
… | |
294 | } |
312 | } |
295 | |
313 | |
296 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
297 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
298 | |
316 | |
299 | struct vpndata_packet:vpn_packet |
317 | struct vpndata_packet : vpn_packet |
300 | { |
318 | { |
301 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
302 | |
320 | |
303 | 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); |
304 | tap_packet *unpack (connection *conn, u32 &seqno); |
322 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
317 | int outl = 0, outl2; |
335 | int outl = 0, outl2; |
318 | ptype type = PT_DATA_UNCOMPRESSED; |
336 | ptype type = PT_DATA_UNCOMPRESSED; |
319 | |
337 | |
320 | #if ENABLE_COMPRESSION |
338 | #if ENABLE_COMPRESSION |
321 | u8 cdata[MAX_MTU]; |
339 | u8 cdata[MAX_MTU]; |
322 | u32 cl; |
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323 | |
340 | |
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341 | if (conn->features & ENABLE_COMPRESSION) |
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342 | { |
324 | 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 | |
325 | if (cl) |
345 | if (cl) |
326 | { |
346 | { |
327 | type = PT_DATA_COMPRESSED; |
347 | type = PT_DATA_COMPRESSED; |
328 | d = cdata; |
348 | d = cdata; |
329 | l = cl + 2; |
349 | l = cl + 2; |
330 | |
350 | |
331 | d[0] = cl >> 8; |
351 | d[0] = cl >> 8; |
332 | d[1] = cl; |
352 | d[1] = cl; |
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353 | } |
333 | } |
354 | } |
334 | #endif |
355 | #endif |
335 | |
356 | |
336 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
357 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
337 | |
358 | |
338 | struct { |
359 | struct { |
339 | #if RAND_SIZE |
360 | #if RAND_SIZE |
340 | u8 rnd[RAND_SIZE]; |
361 | u8 rnd[RAND_SIZE]; |
341 | #endif |
362 | #endif |
… | |
… | |
345 | datahdr.seqno = ntohl (seqno); |
366 | datahdr.seqno = ntohl (seqno); |
346 | #if RAND_SIZE |
367 | #if RAND_SIZE |
347 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
368 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
348 | #endif |
369 | #endif |
349 | |
370 | |
350 | EVP_EncryptUpdate (cctx, |
371 | require (EVP_EncryptUpdate (cctx, |
351 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) data + outl, &outl2, |
352 | (unsigned char *) &datahdr, DATAHDR); |
373 | (unsigned char *) &datahdr, DATAHDR)); |
353 | outl += outl2; |
374 | outl += outl2; |
354 | |
375 | |
355 | EVP_EncryptUpdate (cctx, |
376 | require (EVP_EncryptUpdate (cctx, |
356 | (unsigned char *) data + outl, &outl2, |
377 | (unsigned char *) data + outl, &outl2, |
357 | (unsigned char *) d, l); |
378 | (unsigned char *) d, l)); |
358 | outl += outl2; |
379 | outl += outl2; |
359 | |
380 | |
360 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
381 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
361 | outl += outl2; |
382 | outl += outl2; |
362 | |
383 | |
363 | len = outl + data_hdr_size (); |
384 | len = outl + data_hdr_size (); |
364 | |
385 | |
365 | set_hdr (type, dst); |
386 | set_hdr (type, dst); |
… | |
… | |
374 | int outl = 0, outl2; |
395 | int outl = 0, outl2; |
375 | tap_packet *p = new tap_packet; |
396 | tap_packet *p = new tap_packet; |
376 | u8 *d; |
397 | u8 *d; |
377 | u32 l = len - data_hdr_size (); |
398 | u32 l = len - data_hdr_size (); |
378 | |
399 | |
379 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
400 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
380 | |
401 | |
381 | #if ENABLE_COMPRESSION |
402 | #if ENABLE_COMPRESSION |
382 | u8 cdata[MAX_MTU]; |
403 | u8 cdata[MAX_MTU]; |
383 | |
404 | |
384 | if (type == PT_DATA_COMPRESSED) |
405 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
386 | else |
407 | else |
387 | #endif |
408 | #endif |
388 | d = &(*p)[6 + 6 - DATAHDR]; |
409 | d = &(*p)[6 + 6 - DATAHDR]; |
389 | |
410 | |
390 | /* 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 */ |
391 | EVP_DecryptUpdate (cctx, |
412 | require (EVP_DecryptUpdate (cctx, |
392 | d, &outl2, |
413 | d, &outl2, |
393 | (unsigned char *)&data, len - data_hdr_size ()); |
414 | (unsigned char *)&data, len - data_hdr_size ())); |
394 | outl += outl2; |
415 | outl += outl2; |
395 | |
416 | |
396 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
417 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
397 | outl += outl2; |
418 | outl += outl2; |
398 | |
419 | |
399 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
420 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
400 | |
421 | |
401 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
422 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
430 | { |
451 | { |
431 | // actually, hmaclen cannot be checked because the hmac |
452 | // actually, hmaclen cannot be checked because the hmac |
432 | // field comes before this data, so peers with other |
453 | // field comes before this data, so peers with other |
433 | // hmacs simply will not work. |
454 | // hmacs simply will not work. |
434 | u8 prot_major, prot_minor, randsize, hmaclen; |
455 | u8 prot_major, prot_minor, randsize, hmaclen; |
435 | u8 flags, challengelen, pad2, pad3; |
456 | u8 flags, challengelen, features, pad3; |
436 | u32 cipher_nid, digest_nid, hmac_nid; |
457 | u32 cipher_nid, digest_nid, hmac_nid; |
437 | |
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438 | const u8 curflags () const |
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439 | { |
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440 | return 0x80 |
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441 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
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|
442 | } |
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|
443 | |
458 | |
444 | void setup (ptype type, int dst); |
459 | void setup (ptype type, int dst); |
445 | 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 |
|
|
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; |
|
|
472 | } |
446 | }; |
473 | }; |
447 | |
474 | |
448 | void config_packet::setup (ptype type, int dst) |
475 | void config_packet::setup (ptype type, int dst) |
449 | { |
476 | { |
450 | prot_major = PROTOCOL_MAJOR; |
477 | prot_major = PROTOCOL_MAJOR; |
451 | prot_minor = PROTOCOL_MINOR; |
478 | prot_minor = PROTOCOL_MINOR; |
452 | randsize = RAND_SIZE; |
479 | randsize = RAND_SIZE; |
453 | hmaclen = HMACLENGTH; |
480 | hmaclen = HMACLENGTH; |
454 | flags = curflags (); |
481 | flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
455 | challengelen = sizeof (rsachallenge); |
482 | challengelen = sizeof (rsachallenge); |
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|
483 | features = get_features (); |
456 | |
484 | |
457 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
485 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
458 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
486 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
459 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
487 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
460 | |
488 | |
… | |
… | |
462 | set_hdr (type, dst); |
490 | set_hdr (type, dst); |
463 | } |
491 | } |
464 | |
492 | |
465 | bool config_packet::chk_config () const |
493 | bool config_packet::chk_config () const |
466 | { |
494 | { |
467 | return prot_major == PROTOCOL_MAJOR |
495 | if (prot_major != PROTOCOL_MAJOR) |
468 | && randsize == RAND_SIZE |
496 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
469 | && hmaclen == HMACLENGTH |
497 | else if (randsize != RAND_SIZE) |
470 | && 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 |
471 | && challengelen == sizeof (rsachallenge) |
505 | else if (challengelen != sizeof (rsachallenge)) |
|
|
506 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
472 | && 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)); |
473 | && 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)); |
474 | && 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; |
475 | } |
517 | } |
476 | |
518 | |
477 | struct auth_req_packet : config_packet |
519 | struct auth_req_packet : config_packet |
478 | { |
520 | { |
479 | char magic[8]; |
521 | char magic[8]; |
480 | u8 initiate; // false if this is just an automatic reply |
522 | u8 initiate; // false if this is just an automatic reply |
481 | u8 protocols; // supported protocols (will get patches on forward) |
523 | u8 protocols; // supported protocols (will be patched on forward) |
482 | u8 pad2, pad3; |
524 | u8 pad2, pad3; |
483 | rsaid id; |
525 | rsaid id; |
484 | rsaencrdata encr; |
526 | rsaencrdata encr; |
485 | |
527 | |
486 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
528 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
541 | }; |
583 | }; |
542 | |
584 | |
543 | ///////////////////////////////////////////////////////////////////////////// |
585 | ///////////////////////////////////////////////////////////////////////////// |
544 | |
586 | |
545 | 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 |
546 | connection::reset_dstaddr () |
625 | connection::reset_si () |
547 | { |
626 | { |
|
|
627 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
|
|
628 | |
|
|
629 | // mask out protocols we cannot establish |
|
|
630 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
631 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
632 | |
548 | si.set (conf); |
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); |
|
|
653 | } |
|
|
654 | |
|
|
655 | return si; |
|
|
656 | } |
|
|
657 | |
|
|
658 | void |
|
|
659 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
660 | { |
|
|
661 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
|
|
662 | reset_connection (); |
549 | } |
663 | } |
550 | |
664 | |
551 | void |
665 | void |
552 | connection::send_ping (const sockinfo &si, u8 pong) |
666 | connection::send_ping (const sockinfo &si, u8 pong) |
553 | { |
667 | { |
… | |
… | |
576 | void |
690 | void |
577 | connection::send_auth_request (const sockinfo &si, bool initiate) |
691 | connection::send_auth_request (const sockinfo &si, bool initiate) |
578 | { |
692 | { |
579 | 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); |
580 | |
694 | |
581 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
|
|
582 | |
|
|
583 | rsachallenge chg; |
695 | rsachallenge chg; |
584 | |
|
|
585 | rsa_cache.gen (pkt->id, chg); |
696 | rsa_cache.gen (pkt->id, chg); |
586 | |
697 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
587 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
588 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
589 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
590 | fatal ("RSA_public_encrypt error"); |
|
|
591 | |
698 | |
592 | 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); |
593 | |
700 | |
594 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
701 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
595 | |
702 | |
596 | delete pkt; |
703 | delete pkt; |
597 | } |
704 | } |
598 | |
705 | |
599 | void |
706 | void |
… | |
… | |
627 | |
734 | |
628 | delete r; |
735 | delete r; |
629 | } |
736 | } |
630 | |
737 | |
631 | void |
738 | void |
632 | connection::establish_connection_cb (tstamp &ts) |
739 | connection::establish_connection_cb (time_watcher &w) |
633 | { |
740 | { |
634 | if (ictx || conf == THISNODE |
741 | if (!ictx |
|
|
742 | && conf != THISNODE |
635 | || connectmode == conf_node::C_NEVER |
743 | && connectmode != conf_node::C_NEVER |
636 | || connectmode == conf_node::C_DISABLED) |
744 | && connectmode != conf_node::C_DISABLED |
637 | ts = TSTAMP_CANCEL; |
745 | && NOW > w.at) |
638 | else if (ts <= NOW) |
|
|
639 | { |
746 | { |
640 | 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; |
641 | |
748 | |
642 | if (retry_int < 3600 * 8) |
749 | if (retry_int < conf->max_retry) |
643 | retry_cnt++; |
750 | retry_cnt++; |
|
|
751 | else |
|
|
752 | retry_int = conf->max_retry; |
644 | |
753 | |
645 | ts = NOW + retry_int; |
754 | w.start (NOW + retry_int); |
646 | |
755 | |
647 | if (conf->hostname) |
756 | reset_si (); |
|
|
757 | |
|
|
758 | if (si.prot && !si.host) |
|
|
759 | vpn->send_connect_request (conf->id); |
|
|
760 | else |
648 | { |
761 | { |
649 | reset_dstaddr (); |
762 | const sockinfo &dsi = forward_si (si); |
|
|
763 | |
650 | if (si.host && auth_rate_limiter.can (si)) |
764 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
651 | { |
765 | { |
652 | if (retry_cnt < 4) |
766 | if (retry_cnt < 4) |
653 | send_auth_request (si, true); |
767 | send_auth_request (dsi, true); |
654 | else |
768 | else |
655 | send_ping (si, 0); |
769 | send_ping (dsi, 0); |
656 | } |
770 | } |
657 | } |
771 | } |
658 | else |
|
|
659 | vpn->connect_request (conf->id); |
|
|
660 | } |
772 | } |
661 | } |
773 | } |
662 | |
774 | |
663 | void |
775 | void |
664 | connection::reset_connection () |
776 | connection::reset_connection () |
… | |
… | |
673 | } |
785 | } |
674 | |
786 | |
675 | delete ictx; ictx = 0; |
787 | delete ictx; ictx = 0; |
676 | delete octx; octx = 0; |
788 | delete octx; octx = 0; |
677 | |
789 | |
678 | si.host= 0; |
790 | si.host = 0; |
679 | |
791 | |
680 | last_activity = 0; |
792 | last_activity = 0; |
681 | retry_cnt = 0; |
793 | retry_cnt = 0; |
682 | |
794 | |
683 | rekey.reset (); |
795 | rekey.stop (); |
684 | keepalive.reset (); |
796 | keepalive.stop (); |
685 | establish_connection.reset (); |
797 | establish_connection.stop (); |
686 | } |
798 | } |
687 | |
799 | |
688 | void |
800 | void |
689 | connection::shutdown () |
801 | connection::shutdown () |
690 | { |
802 | { |
… | |
… | |
693 | |
805 | |
694 | reset_connection (); |
806 | reset_connection (); |
695 | } |
807 | } |
696 | |
808 | |
697 | void |
809 | void |
698 | connection::rekey_cb (tstamp &ts) |
810 | connection::rekey_cb (time_watcher &w) |
699 | { |
811 | { |
700 | ts = TSTAMP_CANCEL; |
|
|
701 | |
|
|
702 | reset_connection (); |
812 | reset_connection (); |
703 | establish_connection (); |
813 | establish_connection (); |
704 | } |
814 | } |
705 | |
815 | |
706 | void |
816 | void |
707 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
817 | connection::send_data_packet (tap_packet *pkt) |
708 | { |
818 | { |
709 | vpndata_packet *p = new vpndata_packet; |
819 | vpndata_packet *p = new vpndata_packet; |
710 | int tos = 0; |
820 | int tos = 0; |
711 | |
821 | |
712 | if (conf->inherit_tos |
822 | // I am not hilarious about peeking into packets, but so be it. |
713 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
823 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
714 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
715 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
824 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
716 | |
825 | |
717 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
826 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
718 | send_vpn_packet (p, si, tos); |
827 | send_vpn_packet (p, si, tos); |
719 | |
828 | |
720 | delete p; |
829 | delete p; |
721 | |
830 | |
722 | if (oseqno > MAX_SEQNO) |
831 | if (oseqno > MAX_SEQNO) |
723 | rekey (); |
832 | rekey (); |
724 | } |
833 | } |
725 | |
834 | |
726 | void |
835 | void |
727 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
836 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
728 | { |
837 | { |
729 | if (ictx && octx) |
838 | if (ictx && octx) |
730 | send_data_packet (pkt, broadcast); |
839 | send_data_packet (pkt); |
731 | else |
840 | else |
732 | { |
841 | { |
733 | if (!broadcast)//DDDD |
842 | if (!broadcast)//DDDD |
734 | queue.put (new tap_packet (*pkt)); |
843 | data_queue.put (new tap_packet (*pkt)); |
|
|
844 | |
|
|
845 | establish_connection (); |
|
|
846 | } |
|
|
847 | } |
|
|
848 | |
|
|
849 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
|
|
850 | { |
|
|
851 | if (ictx && octx) |
|
|
852 | send_vpn_packet (pkt, si, tos); |
|
|
853 | else |
|
|
854 | { |
|
|
855 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
735 | |
856 | |
736 | establish_connection (); |
857 | establish_connection (); |
737 | } |
858 | } |
738 | } |
859 | } |
739 | |
860 | |
… | |
… | |
745 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
866 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
746 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
867 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
747 | |
868 | |
748 | switch (pkt->typ ()) |
869 | switch (pkt->typ ()) |
749 | { |
870 | { |
750 | case vpn_packet::PT_PING: |
871 | case vpn_packet::PT_PING: |
751 | // we send pings instead of auth packets after some retries, |
872 | // we send pings instead of auth packets after some retries, |
752 | // so reset the retry counter and establish a connection |
873 | // so reset the retry counter and establish a connection |
753 | // when we receive a ping. |
874 | // when we receive a ping. |
754 | if (!ictx) |
875 | if (!ictx) |
|
|
876 | { |
|
|
877 | if (auth_rate_limiter.can (rsi)) |
|
|
878 | send_auth_request (rsi, true); |
|
|
879 | } |
|
|
880 | else |
|
|
881 | send_ping (rsi, 1); // pong |
|
|
882 | |
|
|
883 | break; |
|
|
884 | |
|
|
885 | case vpn_packet::PT_PONG: |
|
|
886 | break; |
|
|
887 | |
|
|
888 | case vpn_packet::PT_RESET: |
755 | { |
889 | { |
756 | if (auth_rate_limiter.can (rsi)) |
890 | reset_connection (); |
757 | send_auth_request (rsi, true); |
891 | |
|
|
892 | config_packet *p = (config_packet *) pkt; |
|
|
893 | |
|
|
894 | if (!p->chk_config ()) |
|
|
895 | { |
|
|
896 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
|
|
897 | conf->nodename, (const char *)rsi); |
|
|
898 | connectmode = conf_node::C_DISABLED; |
|
|
899 | } |
|
|
900 | else if (connectmode == conf_node::C_ALWAYS) |
|
|
901 | establish_connection (); |
758 | } |
902 | } |
759 | else |
|
|
760 | send_ping (rsi, 1); // pong |
|
|
761 | |
|
|
762 | break; |
903 | break; |
763 | |
904 | |
764 | case vpn_packet::PT_PONG: |
|
|
765 | break; |
|
|
766 | |
|
|
767 | case vpn_packet::PT_RESET: |
905 | case vpn_packet::PT_AUTH_REQ: |
768 | { |
906 | if (auth_rate_limiter.can (rsi)) |
769 | reset_connection (); |
|
|
770 | |
|
|
771 | config_packet *p = (config_packet *) pkt; |
|
|
772 | |
|
|
773 | if (!p->chk_config ()) |
|
|
774 | { |
907 | { |
|
|
908 | auth_req_packet *p = (auth_req_packet *) pkt; |
|
|
909 | |
|
|
910 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
|
|
911 | |
|
|
912 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
|
|
913 | { |
|
|
914 | if (p->prot_minor != PROTOCOL_MINOR) |
|
|
915 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
916 | conf->nodename, (const char *)rsi, |
|
|
917 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
918 | |
|
|
919 | if (p->initiate) |
|
|
920 | send_auth_request (rsi, false); |
|
|
921 | |
|
|
922 | rsachallenge k; |
|
|
923 | |
|
|
924 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
|
|
925 | { |
|
|
926 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
|
|
927 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
928 | break; |
|
|
929 | } |
|
|
930 | else |
|
|
931 | { |
|
|
932 | delete octx; |
|
|
933 | |
|
|
934 | octx = new crypto_ctx (k, 1); |
|
|
935 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
|
|
936 | |
|
|
937 | // compatibility code, remove when no longer required |
|
|
938 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
939 | |
|
|
940 | conf->protocols = p->protocols; |
|
|
941 | features = p->features & config_packet::get_features (); |
|
|
942 | |
|
|
943 | send_auth_response (rsi, p->id, k); |
|
|
944 | |
|
|
945 | connection_established (); |
|
|
946 | |
|
|
947 | break; |
|
|
948 | } |
|
|
949 | } |
|
|
950 | else |
775 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
951 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
776 | conf->nodename, (const char *)rsi); |
952 | conf->nodename, (const char *)rsi); |
777 | connectmode = conf_node::C_DISABLED; |
953 | |
|
|
954 | send_reset (rsi); |
778 | } |
955 | } |
779 | else if (connectmode == conf_node::C_ALWAYS) |
956 | |
780 | establish_connection (); |
|
|
781 | } |
|
|
782 | break; |
957 | break; |
783 | |
958 | |
784 | case vpn_packet::PT_AUTH_REQ: |
959 | case vpn_packet::PT_AUTH_RES: |
785 | if (auth_rate_limiter.can (rsi)) |
|
|
786 | { |
960 | { |
787 | auth_req_packet *p = (auth_req_packet *) pkt; |
961 | auth_res_packet *p = (auth_res_packet *) pkt; |
788 | |
962 | |
789 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
963 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
790 | |
964 | |
791 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
965 | if (p->chk_config ()) |
792 | { |
966 | { |
793 | if (p->prot_minor != PROTOCOL_MINOR) |
967 | if (p->prot_minor != PROTOCOL_MINOR) |
794 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
968 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
795 | conf->nodename, (const char *)rsi, |
969 | conf->nodename, (const char *)rsi, |
796 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
970 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
797 | |
971 | |
798 | if (p->initiate) |
|
|
799 | send_auth_request (rsi, false); |
|
|
800 | |
|
|
801 | rsachallenge k; |
972 | rsachallenge chg; |
802 | |
973 | |
803 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
974 | if (!rsa_cache.find (p->id, chg)) |
804 | (unsigned char *)&p->encr, (unsigned char *)&k, |
975 | { |
805 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
976 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
806 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
|
|
807 | conf->nodename, (const char *)rsi); |
977 | conf->nodename, (const char *)rsi); |
|
|
978 | break; |
|
|
979 | } |
808 | else |
980 | else |
809 | { |
981 | { |
810 | retry_cnt = 0; |
982 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
811 | establish_connection.set (NOW + 8); //? ;) |
983 | |
812 | keepalive.reset (); |
984 | if (!p->hmac_chk (cctx)) |
|
|
985 | { |
|
|
986 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
987 | "could be an attack, or just corruption or a synchronization error"), |
|
|
988 | conf->nodename, (const char *)rsi); |
|
|
989 | break; |
|
|
990 | } |
813 | rekey.reset (); |
991 | else |
|
|
992 | { |
|
|
993 | rsaresponse h; |
814 | |
994 | |
|
|
995 | rsa_hash (p->id, chg, h); |
|
|
996 | |
|
|
997 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
998 | { |
|
|
999 | prot_minor = p->prot_minor; |
|
|
1000 | |
|
|
1001 | delete ictx; ictx = cctx; |
|
|
1002 | |
|
|
1003 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
1004 | |
|
|
1005 | si = rsi; |
|
|
1006 | protocol = rsi.prot; |
|
|
1007 | |
|
|
1008 | connection_established (); |
|
|
1009 | |
|
|
1010 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1011 | conf->nodename, (const char *)rsi, |
|
|
1012 | p->prot_major, p->prot_minor); |
|
|
1013 | |
|
|
1014 | if (::conf.script_node_up) |
|
|
1015 | run_script (run_script_cb (this, &connection::script_node_up), false); |
|
|
1016 | |
|
|
1017 | break; |
|
|
1018 | } |
|
|
1019 | else |
|
|
1020 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
1021 | conf->nodename, (const char *)rsi); |
|
|
1022 | } |
|
|
1023 | |
815 | delete ictx; |
1024 | delete cctx; |
816 | ictx = 0; |
|
|
817 | |
|
|
818 | delete octx; |
|
|
819 | |
|
|
820 | octx = new crypto_ctx (k, 1); |
|
|
821 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
|
|
822 | |
|
|
823 | conf->protocols = p->protocols; |
|
|
824 | send_auth_response (rsi, p->id, k); |
|
|
825 | |
|
|
826 | break; |
|
|
827 | } |
1025 | } |
828 | } |
1026 | } |
829 | |
|
|
830 | send_reset (rsi); |
|
|
831 | } |
1027 | } |
832 | |
1028 | |
|
|
1029 | send_reset (rsi); |
833 | break; |
1030 | break; |
834 | |
1031 | |
835 | case vpn_packet::PT_AUTH_RES: |
1032 | case vpn_packet::PT_DATA_COMPRESSED: |
836 | { |
1033 | #if !ENABLE_COMPRESSION |
837 | auth_res_packet *p = (auth_res_packet *) pkt; |
1034 | send_reset (rsi); |
|
|
1035 | break; |
|
|
1036 | #endif |
838 | |
1037 | |
839 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1038 | case vpn_packet::PT_DATA_UNCOMPRESSED: |
840 | |
1039 | |
841 | if (p->chk_config ()) |
1040 | if (ictx && octx) |
842 | { |
1041 | { |
843 | if (p->prot_minor != PROTOCOL_MINOR) |
1042 | vpndata_packet *p = (vpndata_packet *)pkt; |
844 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
845 | conf->nodename, (const char *)rsi, |
|
|
846 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
847 | |
1043 | |
848 | rsachallenge chg; |
1044 | if (!p->hmac_chk (ictx)) |
849 | |
1045 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
850 | if (!rsa_cache.find (p->id, chg)) |
1046 | "could be an attack, or just corruption or a synchronization error"), |
851 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
|
|
852 | conf->nodename, (const char *)rsi); |
1047 | conf->nodename, (const char *)rsi); |
853 | else |
1048 | else |
854 | { |
1049 | { |
855 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
|
|
856 | |
|
|
857 | if (!p->hmac_chk (cctx)) |
|
|
858 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
859 | "could be an attack, or just corruption or an synchronization error"), |
|
|
860 | conf->nodename, (const char *)rsi); |
|
|
861 | else |
1050 | u32 seqno; |
|
|
1051 | tap_packet *d = p->unpack (this, seqno); |
|
|
1052 | |
|
|
1053 | if (iseqno.recv_ok (seqno)) |
862 | { |
1054 | { |
863 | rsaresponse h; |
1055 | vpn->tap->send (d); |
864 | |
1056 | |
865 | rsa_hash (p->id, chg, h); |
1057 | if (si != rsi) |
866 | |
|
|
867 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
868 | { |
1058 | { |
869 | prot_minor = p->prot_minor; |
1059 | // fast re-sync on connection changes, useful especially for tcp/ip |
870 | |
|
|
871 | delete ictx; ictx = cctx; |
|
|
872 | |
|
|
873 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
874 | |
|
|
875 | si = rsi; |
1060 | si = rsi; |
876 | |
1061 | |
877 | rekey.set (NOW + ::conf.rekey); |
1062 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
878 | keepalive.set (NOW + ::conf.keepalive); |
|
|
879 | |
|
|
880 | // send queued packets |
|
|
881 | while (tap_packet *p = queue.get ()) |
|
|
882 | { |
|
|
883 | send_data_packet (p); |
|
|
884 | delete p; |
|
|
885 | } |
|
|
886 | |
|
|
887 | connectmode = conf->connectmode; |
|
|
888 | |
|
|
889 | slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"), |
|
|
890 | conf->nodename, (const char *)rsi, |
1063 | conf->nodename, (const char *)si, (const char *)rsi); |
891 | strprotocol (protocol), |
|
|
892 | p->prot_major, p->prot_minor); |
|
|
893 | |
|
|
894 | if (::conf.script_node_up) |
|
|
895 | run_script (run_script_cb (this, &connection::script_node_up), false); |
|
|
896 | |
|
|
897 | break; |
|
|
898 | } |
1064 | } |
899 | else |
|
|
900 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
901 | conf->nodename, (const char *)rsi); |
|
|
902 | } |
1065 | } |
903 | |
1066 | |
904 | delete cctx; |
1067 | delete d; |
|
|
1068 | break; |
905 | } |
1069 | } |
906 | } |
1070 | } |
907 | } |
|
|
908 | |
1071 | |
909 | send_reset (rsi); |
1072 | send_reset (rsi); |
910 | break; |
1073 | break; |
911 | |
1074 | |
912 | case vpn_packet::PT_DATA_COMPRESSED: |
|
|
913 | #if !ENABLE_COMPRESSION |
|
|
914 | send_reset (rsi); |
|
|
915 | break; |
|
|
916 | #endif |
|
|
917 | |
|
|
918 | case vpn_packet::PT_DATA_UNCOMPRESSED: |
|
|
919 | |
|
|
920 | if (ictx && octx) |
|
|
921 | { |
|
|
922 | vpndata_packet *p = (vpndata_packet *)pkt; |
|
|
923 | |
|
|
924 | if (rsi == si) |
|
|
925 | { |
|
|
926 | if (!p->hmac_chk (ictx)) |
|
|
927 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
928 | "could be an attack, or just corruption or an synchronization error"), |
|
|
929 | conf->nodename, (const char *)rsi); |
|
|
930 | else |
|
|
931 | { |
|
|
932 | u32 seqno; |
|
|
933 | tap_packet *d = p->unpack (this, seqno); |
|
|
934 | |
|
|
935 | if (iseqno.recv_ok (seqno)) |
|
|
936 | { |
|
|
937 | vpn->tap->send (d); |
|
|
938 | |
|
|
939 | if (p->dst () == 0) // re-broadcast |
|
|
940 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
941 | { |
|
|
942 | connection *c = *i; |
|
|
943 | |
|
|
944 | if (c->conf != THISNODE && c->conf != conf) |
|
|
945 | c->inject_data_packet (d); |
|
|
946 | } |
|
|
947 | |
|
|
948 | delete d; |
|
|
949 | |
|
|
950 | break; |
|
|
951 | } |
|
|
952 | } |
|
|
953 | } |
|
|
954 | else |
|
|
955 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi); |
|
|
956 | } |
|
|
957 | |
|
|
958 | send_reset (rsi); |
|
|
959 | break; |
|
|
960 | |
|
|
961 | case vpn_packet::PT_CONNECT_REQ: |
1075 | case vpn_packet::PT_CONNECT_REQ: |
962 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1076 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
963 | { |
1077 | { |
964 | connect_req_packet *p = (connect_req_packet *) pkt; |
1078 | connect_req_packet *p = (connect_req_packet *) pkt; |
965 | |
1079 | |
966 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1080 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
967 | conf->protocols = p->protocols; |
|
|
968 | connection *c = vpn->conns[p->id - 1]; |
1081 | connection *c = vpn->conns[p->id - 1]; |
|
|
1082 | conf->protocols = p->protocols; |
969 | |
1083 | |
970 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1084 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
971 | conf->id, p->id, c->ictx && c->octx); |
1085 | conf->id, p->id, c->ictx && c->octx); |
972 | |
1086 | |
973 | if (c->ictx && c->octx) |
1087 | if (c->ictx && c->octx) |
974 | { |
1088 | { |
975 | // send connect_info packets to both sides, in case one is |
1089 | // send connect_info packets to both sides, in case one is |
976 | // behind a nat firewall (or both ;) |
1090 | // behind a nat firewall (or both ;) |
977 | c->send_connect_info (conf->id, si, conf->protocols); |
1091 | c->send_connect_info (conf->id, si, conf->protocols); |
978 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1092 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
979 | } |
1093 | } |
|
|
1094 | else |
|
|
1095 | c->establish_connection (); |
980 | } |
1096 | } |
981 | |
1097 | |
982 | break; |
1098 | break; |
983 | |
1099 | |
984 | case vpn_packet::PT_CONNECT_INFO: |
1100 | case vpn_packet::PT_CONNECT_INFO: |
985 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1101 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
986 | { |
1102 | { |
987 | connect_info_packet *p = (connect_info_packet *) pkt; |
1103 | connect_info_packet *p = (connect_info_packet *) pkt; |
988 | |
1104 | |
989 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1105 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
990 | conf->protocols = p->protocols; |
1106 | |
991 | connection *c = vpn->conns[p->id - 1]; |
1107 | connection *c = vpn->conns[p->id - 1]; |
992 | |
1108 | |
|
|
1109 | c->conf->protocols = p->protocols; |
|
|
1110 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
|
|
1111 | p->si.upgrade_protocol (protocol, c->conf); |
|
|
1112 | |
993 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1113 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
994 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1114 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
995 | |
1115 | |
|
|
1116 | const sockinfo &dsi = forward_si (p->si); |
|
|
1117 | |
|
|
1118 | if (dsi.valid ()) |
996 | c->send_auth_request (p->si, true); |
1119 | c->send_auth_request (dsi, true); |
997 | } |
1120 | } |
998 | |
1121 | |
999 | break; |
1122 | break; |
1000 | |
1123 | |
1001 | default: |
1124 | default: |
1002 | send_reset (rsi); |
1125 | send_reset (rsi); |
1003 | break; |
1126 | break; |
1004 | |
|
|
1005 | } |
1127 | } |
1006 | } |
1128 | } |
1007 | |
1129 | |
1008 | void connection::keepalive_cb (tstamp &ts) |
1130 | void connection::keepalive_cb (time_watcher &w) |
1009 | { |
1131 | { |
1010 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1132 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1011 | { |
1133 | { |
1012 | reset_connection (); |
1134 | reset_connection (); |
1013 | establish_connection (); |
1135 | establish_connection (); |
1014 | } |
1136 | } |
1015 | else if (NOW < last_activity + ::conf.keepalive) |
1137 | else if (NOW < last_activity + ::conf.keepalive) |
1016 | ts = last_activity + ::conf.keepalive; |
1138 | w.start (last_activity + ::conf.keepalive); |
1017 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1139 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1018 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1140 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1019 | { |
1141 | { |
1020 | send_ping (si); |
1142 | send_ping (si); |
1021 | ts = NOW + 5; |
1143 | w.start (NOW + 5); |
1022 | } |
1144 | } |
|
|
1145 | else if (NOW < last_activity + ::conf.keepalive + 10) |
|
|
1146 | // hold ondemand connections implicitly a few seconds longer |
|
|
1147 | // should delete octx, though, or something like that ;) |
|
|
1148 | w.start (last_activity + ::conf.keepalive + 10); |
1023 | else |
1149 | else |
1024 | reset_connection (); |
1150 | reset_connection (); |
1025 | } |
1151 | } |
1026 | |
1152 | |
1027 | void connection::connect_request (int id) |
1153 | void connection::send_connect_request (int id) |
1028 | { |
1154 | { |
1029 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1155 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1030 | |
1156 | |
1031 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1157 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1032 | p->hmac_set (octx); |
1158 | p->hmac_set (octx); |
… | |
… | |
1035 | delete p; |
1161 | delete p; |
1036 | } |
1162 | } |
1037 | |
1163 | |
1038 | void connection::script_node () |
1164 | void connection::script_node () |
1039 | { |
1165 | { |
1040 | vpn->script_if_up (0); |
1166 | vpn->script_if_up (); |
1041 | |
1167 | |
1042 | char *env; |
1168 | char *env; |
1043 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1169 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1044 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1170 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1045 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1171 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1046 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1172 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1047 | } |
1173 | } |
1048 | |
1174 | |
1049 | const char *connection::script_node_up (int) |
1175 | const char *connection::script_node_up () |
1050 | { |
1176 | { |
1051 | script_node (); |
1177 | script_node (); |
1052 | |
1178 | |
1053 | putenv ("STATE=up"); |
1179 | putenv ("STATE=up"); |
1054 | |
1180 | |
1055 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1181 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1056 | } |
1182 | } |
1057 | |
1183 | |
1058 | const char *connection::script_node_down (int) |
1184 | const char *connection::script_node_down () |
1059 | { |
1185 | { |
1060 | script_node (); |
1186 | script_node (); |
1061 | |
1187 | |
1062 | putenv ("STATE=down"); |
1188 | putenv ("STATE=down"); |
1063 | |
1189 | |
1064 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1190 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1065 | } |
|
|
1066 | |
|
|
1067 | // send a vpn packet out to other hosts |
|
|
1068 | void |
|
|
1069 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
1070 | { |
|
|
1071 | if (protocol & PROT_IPv4) |
|
|
1072 | vpn->send_ipv4_packet (pkt, si, tos); |
|
|
1073 | else |
|
|
1074 | vpn->send_udpv4_packet (pkt, si, tos); |
|
|
1075 | } |
1191 | } |
1076 | |
1192 | |
1077 | connection::connection(struct vpn *vpn_) |
1193 | connection::connection(struct vpn *vpn_) |
1078 | : vpn(vpn_) |
1194 | : vpn(vpn_) |
1079 | , rekey (this, &connection::rekey_cb) |
1195 | , rekey (this, &connection::rekey_cb) |