1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
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3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "config.h" |
20 | |
23 | |
21 | extern "C" { |
24 | #include <cassert> |
22 | # include "lzf/lzf.h" |
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23 | } |
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24 | |
25 | |
25 | #include <list> |
26 | #include <list> |
26 | |
27 | |
27 | #include <openssl/rand.h> |
28 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
29 | #include <openssl/evp.h> |
29 | #include <openssl/rsa.h> |
30 | #include <openssl/rsa.h> |
30 | #include <openssl/err.h> |
31 | #include <openssl/err.h> |
31 | |
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32 | #include "gettext.h" |
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33 | |
32 | |
34 | #include "conf.h" |
33 | #include "conf.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; |
… | |
… | |
88 | struct rsa_cache : list<rsa_entry> |
95 | struct rsa_cache : list<rsa_entry> |
89 | { |
96 | { |
90 | void cleaner_cb (time_watcher &w); 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 | { |
96 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
103 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
97 | { |
104 | { |
98 | memcpy (&chg, &i->chg, sizeof chg); |
105 | memcpy (&chg, &i->chg, sizeof chg); |
99 | |
106 | |
100 | erase (i); |
107 | erase (i); |
101 | return true; |
108 | return true; |
102 | } |
109 | } |
103 | } |
110 | } |
104 | |
111 | |
105 | if (cleaner.at < NOW) |
112 | if (cleaner.at < NOW) |
106 | cleaner.start (NOW + RSA_TTL); |
113 | cleaner.start (NOW + RSA_TTL); |
107 | |
114 | |
108 | return false; |
115 | return false; |
109 | } |
116 | } |
110 | |
117 | |
111 | void gen (rsaid &id, rsachallenge &chg) |
118 | void gen (rsaid &id, rsachallenge &chg) |
112 | { |
119 | { |
113 | rsa_entry e; |
120 | rsa_entry e; |
114 | |
121 | |
115 | RAND_bytes ((unsigned char *)&id, sizeof id); |
122 | RAND_bytes ((unsigned char *)&id, sizeof id); |
116 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
123 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
117 | |
124 | |
118 | e.expire = NOW + RSA_TTL; |
125 | e.expire = NOW + RSA_TTL; |
119 | e.id = id; |
126 | e.id = id; |
120 | memcpy (&e.chg, &chg, sizeof chg); |
127 | memcpy (&e.chg, &chg, sizeof chg); |
121 | |
128 | |
122 | push_back (e); |
129 | push_back (e); |
123 | |
130 | |
124 | if (cleaner.at < NOW) |
131 | if (cleaner.at < NOW) |
125 | cleaner.start (NOW + RSA_TTL); |
132 | cleaner.start (NOW + RSA_TTL); |
126 | } |
133 | } |
127 | |
134 | |
128 | rsa_cache () |
135 | rsa_cache () |
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 (time_watcher &w) |
141 | void rsa_cache::cleaner_cb (time_watcher &w) |
135 | { |
142 | { |
136 | if (empty ()) |
143 | if (!empty ()) |
137 | w.at = TSTAMP_CANCEL; |
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138 | else |
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139 | { |
144 | { |
140 | w.at = 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 |
… | |
… | |
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. / 180.; // allow bursts |
207 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
203 | static const double CUTOFF = 10.; // 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 |
205 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
210 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
206 | |
211 | |
207 | bool can (const sockinfo &si) { return can((u32)si.host); } |
212 | bool can (const sockinfo &si) { return can((u32)si.host); } |
208 | bool can (u32 host); |
213 | bool can (u32 host); |
209 | }; |
214 | }; |
210 | |
215 | |
211 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
216 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
212 | |
217 | |
… | |
… | |
215 | iterator i; |
220 | iterator i; |
216 | |
221 | |
217 | for (i = begin (); i != end (); ) |
222 | for (i = begin (); i != end (); ) |
218 | if (i->host == host) |
223 | if (i->host == host) |
219 | break; |
224 | break; |
220 | else if (i->last < NOW - EXPIRE) |
225 | else if (i->last < NOW - NRL_EXPIRE) |
221 | i = erase (i); |
226 | i = erase (i); |
222 | else |
227 | else |
223 | i++; |
228 | i++; |
224 | |
229 | |
225 | if (i == end ()) |
230 | if (i == end ()) |
226 | { |
231 | { |
227 | net_rateinfo ri; |
232 | net_rateinfo ri; |
228 | |
233 | |
229 | ri.host = host; |
234 | ri.host = host; |
230 | ri.pcnt = 1.; |
235 | ri.pcnt = 1.; |
231 | ri.diff = MAXDIF; |
236 | ri.diff = NRL_MAXDIF; |
232 | ri.last = NOW; |
237 | ri.last = NOW; |
233 | |
238 | |
234 | push_front (ri); |
239 | push_front (ri); |
235 | |
240 | |
236 | return true; |
241 | return true; |
… | |
… | |
238 | else |
243 | else |
239 | { |
244 | { |
240 | net_rateinfo ri (*i); |
245 | net_rateinfo ri (*i); |
241 | erase (i); |
246 | erase (i); |
242 | |
247 | |
243 | ri.pcnt = ri.pcnt * ALPHA; |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
244 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
249 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
245 | |
250 | |
246 | ri.last = NOW; |
251 | ri.last = NOW; |
247 | |
252 | |
248 | double dif = ri.diff / ri.pcnt; |
253 | double dif = ri.diff / ri.pcnt; |
249 | |
254 | |
250 | bool send = dif > CUTOFF; |
255 | bool send = dif > NRL_CUTOFF; |
251 | |
256 | |
252 | if (dif > MAXDIF) |
257 | if (dif > NRL_MAXDIF) |
253 | { |
258 | { |
254 | ri.pcnt = 1.; |
259 | ri.pcnt = 1.; |
255 | ri.diff = MAXDIF; |
260 | ri.diff = NRL_MAXDIF; |
256 | } |
261 | } |
257 | else if (send) |
262 | else if (send) |
258 | ri.pcnt++; |
263 | ri.pcnt++; |
259 | |
264 | |
260 | push_front (ri); |
265 | push_front (ri); |
… | |
… | |
307 | } |
312 | } |
308 | |
313 | |
309 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
310 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
311 | |
316 | |
312 | struct vpndata_packet:vpn_packet |
317 | struct vpndata_packet : vpn_packet |
313 | { |
318 | { |
314 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
315 | |
320 | |
316 | 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); |
317 | tap_packet *unpack (connection *conn, u32 &seqno); |
322 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
330 | int outl = 0, outl2; |
335 | int outl = 0, outl2; |
331 | ptype type = PT_DATA_UNCOMPRESSED; |
336 | ptype type = PT_DATA_UNCOMPRESSED; |
332 | |
337 | |
333 | #if ENABLE_COMPRESSION |
338 | #if ENABLE_COMPRESSION |
334 | u8 cdata[MAX_MTU]; |
339 | u8 cdata[MAX_MTU]; |
335 | u32 cl; |
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336 | |
340 | |
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341 | if (conn->features & ENABLE_COMPRESSION) |
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342 | { |
337 | 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 | |
338 | if (cl) |
345 | if (cl) |
339 | { |
346 | { |
340 | type = PT_DATA_COMPRESSED; |
347 | type = PT_DATA_COMPRESSED; |
341 | d = cdata; |
348 | d = cdata; |
342 | l = cl + 2; |
349 | l = cl + 2; |
343 | |
350 | |
344 | d[0] = cl >> 8; |
351 | d[0] = cl >> 8; |
345 | d[1] = cl; |
352 | d[1] = cl; |
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353 | } |
346 | } |
354 | } |
347 | #endif |
355 | #endif |
348 | |
356 | |
349 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
357 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
350 | |
358 | |
351 | struct { |
359 | struct { |
352 | #if RAND_SIZE |
360 | #if RAND_SIZE |
353 | u8 rnd[RAND_SIZE]; |
361 | u8 rnd[RAND_SIZE]; |
354 | #endif |
362 | #endif |
… | |
… | |
358 | datahdr.seqno = ntohl (seqno); |
366 | datahdr.seqno = ntohl (seqno); |
359 | #if RAND_SIZE |
367 | #if RAND_SIZE |
360 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
368 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
361 | #endif |
369 | #endif |
362 | |
370 | |
363 | EVP_EncryptUpdate (cctx, |
371 | require (EVP_EncryptUpdate (cctx, |
364 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) data + outl, &outl2, |
365 | (unsigned char *) &datahdr, DATAHDR); |
373 | (unsigned char *) &datahdr, DATAHDR)); |
366 | outl += outl2; |
374 | outl += outl2; |
367 | |
375 | |
368 | EVP_EncryptUpdate (cctx, |
376 | require (EVP_EncryptUpdate (cctx, |
369 | (unsigned char *) data + outl, &outl2, |
377 | (unsigned char *) data + outl, &outl2, |
370 | (unsigned char *) d, l); |
378 | (unsigned char *) d, l)); |
371 | outl += outl2; |
379 | outl += outl2; |
372 | |
380 | |
373 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
381 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
374 | outl += outl2; |
382 | outl += outl2; |
375 | |
383 | |
376 | len = outl + data_hdr_size (); |
384 | len = outl + data_hdr_size (); |
377 | |
385 | |
378 | set_hdr (type, dst); |
386 | set_hdr (type, dst); |
… | |
… | |
387 | int outl = 0, outl2; |
395 | int outl = 0, outl2; |
388 | tap_packet *p = new tap_packet; |
396 | tap_packet *p = new tap_packet; |
389 | u8 *d; |
397 | u8 *d; |
390 | u32 l = len - data_hdr_size (); |
398 | u32 l = len - data_hdr_size (); |
391 | |
399 | |
392 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
400 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
393 | |
401 | |
394 | #if ENABLE_COMPRESSION |
402 | #if ENABLE_COMPRESSION |
395 | u8 cdata[MAX_MTU]; |
403 | u8 cdata[MAX_MTU]; |
396 | |
404 | |
397 | if (type == PT_DATA_COMPRESSED) |
405 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
399 | else |
407 | else |
400 | #endif |
408 | #endif |
401 | d = &(*p)[6 + 6 - DATAHDR]; |
409 | d = &(*p)[6 + 6 - DATAHDR]; |
402 | |
410 | |
403 | /* 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 */ |
404 | EVP_DecryptUpdate (cctx, |
412 | require (EVP_DecryptUpdate (cctx, |
405 | d, &outl2, |
413 | d, &outl2, |
406 | (unsigned char *)&data, len - data_hdr_size ()); |
414 | (unsigned char *)&data, len - data_hdr_size ())); |
407 | outl += outl2; |
415 | outl += outl2; |
408 | |
416 | |
409 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
417 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
410 | outl += outl2; |
418 | outl += outl2; |
411 | |
419 | |
412 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
420 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
413 | |
421 | |
414 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
422 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
443 | { |
451 | { |
444 | // actually, hmaclen cannot be checked because the hmac |
452 | // actually, hmaclen cannot be checked because the hmac |
445 | // field comes before this data, so peers with other |
453 | // field comes before this data, so peers with other |
446 | // hmacs simply will not work. |
454 | // hmacs simply will not work. |
447 | u8 prot_major, prot_minor, randsize, hmaclen; |
455 | u8 prot_major, prot_minor, randsize, hmaclen; |
448 | u8 flags, challengelen, pad2, pad3; |
456 | u8 flags, challengelen, features, pad3; |
449 | u32 cipher_nid, digest_nid, hmac_nid; |
457 | u32 cipher_nid, digest_nid, hmac_nid; |
450 | |
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451 | const u8 curflags () const |
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452 | { |
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|
453 | return 0x80 |
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454 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
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455 | } |
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456 | |
458 | |
457 | void setup (ptype type, int dst); |
459 | void setup (ptype type, int dst); |
458 | bool chk_config () const; |
460 | bool chk_config () const; |
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461 | |
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462 | static u8 get_features () |
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463 | { |
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464 | u8 f = 0; |
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465 | #if ENABLE_COMPRESSION |
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466 | f |= FEATURE_COMPRESSION; |
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|
467 | #endif |
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468 | #if ENABLE_ROHC |
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|
469 | f |= FEATURE_ROHC; |
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|
470 | #endif |
|
|
471 | return f; |
|
|
472 | } |
459 | }; |
473 | }; |
460 | |
474 | |
461 | void config_packet::setup (ptype type, int dst) |
475 | void config_packet::setup (ptype type, int dst) |
462 | { |
476 | { |
463 | prot_major = PROTOCOL_MAJOR; |
477 | prot_major = PROTOCOL_MAJOR; |
464 | prot_minor = PROTOCOL_MINOR; |
478 | prot_minor = PROTOCOL_MINOR; |
465 | randsize = RAND_SIZE; |
479 | randsize = RAND_SIZE; |
466 | hmaclen = HMACLENGTH; |
480 | hmaclen = HMACLENGTH; |
467 | flags = curflags (); |
481 | flags = 0; |
468 | challengelen = sizeof (rsachallenge); |
482 | challengelen = sizeof (rsachallenge); |
|
|
483 | features = get_features (); |
469 | |
484 | |
470 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
485 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
471 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
486 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
472 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
487 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
473 | |
488 | |
… | |
… | |
476 | } |
491 | } |
477 | |
492 | |
478 | bool config_packet::chk_config () const |
493 | bool config_packet::chk_config () const |
479 | { |
494 | { |
480 | if (prot_major != PROTOCOL_MAJOR) |
495 | if (prot_major != PROTOCOL_MAJOR) |
481 | slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); |
496 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
482 | else if (randsize != RAND_SIZE) |
497 | else if (randsize != RAND_SIZE) |
483 | slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); |
498 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
484 | else if (hmaclen != HMACLENGTH) |
499 | else if (hmaclen != HMACLENGTH) |
485 | slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
500 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
486 | else if (flags != curflags ()) |
|
|
487 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
|
|
488 | else if (challengelen != sizeof (rsachallenge)) |
501 | else if (challengelen != sizeof (rsachallenge)) |
489 | slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); |
502 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
490 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
503 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
491 | slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
504 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
492 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
505 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
493 | slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
506 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
494 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
507 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
495 | slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
508 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
496 | else |
509 | else |
497 | return true; |
510 | return true; |
498 | |
511 | |
499 | return false; |
512 | return false; |
500 | } |
513 | } |
501 | |
514 | |
502 | struct auth_req_packet : config_packet |
515 | struct auth_req_packet : config_packet |
503 | { |
516 | { |
504 | char magic[8]; |
517 | char magic[8]; |
505 | u8 initiate; // false if this is just an automatic reply |
518 | u8 initiate; // false if this is just an automatic reply |
506 | u8 protocols; // supported protocols (will get patches on forward) |
519 | u8 protocols; // supported protocols (will be patched on forward) |
507 | u8 pad2, pad3; |
520 | u8 pad2, pad3; |
508 | rsaid id; |
521 | rsaid id; |
509 | rsaencrdata encr; |
522 | rsaencrdata encr; |
510 | |
523 | |
511 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
524 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
572 | { |
585 | { |
573 | if (ictx && octx) |
586 | if (ictx && octx) |
574 | { |
587 | { |
575 | connectmode = conf->connectmode; |
588 | connectmode = conf->connectmode; |
576 | |
589 | |
|
|
590 | // make sure rekeying timeouts are slightly asymmetric |
577 | rekey.start (NOW + ::conf.rekey); |
591 | rekey.start (NOW + ::conf.rekey |
|
|
592 | + (conf->id > THISNODE->id ? 10 : 0)); |
578 | keepalive.start (NOW + ::conf.keepalive); |
593 | keepalive.start (NOW + ::conf.keepalive); |
579 | |
594 | |
580 | // send queued packets |
595 | // send queued packets |
581 | if (ictx && octx) |
596 | if (ictx && octx) |
582 | { |
597 | { |
… | |
… | |
595 | } |
610 | } |
596 | else |
611 | else |
597 | { |
612 | { |
598 | retry_cnt = 0; |
613 | retry_cnt = 0; |
599 | establish_connection.start (NOW + 5); |
614 | establish_connection.start (NOW + 5); |
600 | keepalive.reset (); |
615 | keepalive.stop (); |
601 | rekey.reset (); |
616 | rekey.stop (); |
602 | } |
617 | } |
603 | } |
618 | } |
604 | |
619 | |
605 | void |
620 | void |
606 | connection::reset_si () |
621 | connection::reset_si () |
… | |
… | |
608 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
623 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
609 | |
624 | |
610 | // mask out protocols we cannot establish |
625 | // mask out protocols we cannot establish |
611 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
626 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
612 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
627 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
628 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
613 | |
629 | |
614 | si.set (conf, protocol); |
630 | si.set (conf, protocol); |
615 | } |
631 | } |
616 | |
632 | |
617 | // ensure sockinfo is valid, forward if necessary |
633 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
622 | { |
638 | { |
623 | connection *r = vpn->find_router (); |
639 | connection *r = vpn->find_router (); |
624 | |
640 | |
625 | if (r) |
641 | if (r) |
626 | { |
642 | { |
627 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
643 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
628 | conf->nodename, r->conf->nodename); |
644 | conf->nodename, r->conf->nodename, (const char *)r->si); |
629 | return r->si; |
645 | return r->si; |
630 | } |
646 | } |
631 | else |
647 | else |
632 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
648 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
633 | conf->nodename); |
649 | conf->nodename); |
… | |
… | |
672 | connection::send_auth_request (const sockinfo &si, bool initiate) |
688 | connection::send_auth_request (const sockinfo &si, bool initiate) |
673 | { |
689 | { |
674 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
690 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
675 | |
691 | |
676 | rsachallenge chg; |
692 | rsachallenge chg; |
677 | |
|
|
678 | rsa_cache.gen (pkt->id, chg); |
693 | rsa_cache.gen (pkt->id, chg); |
679 | |
694 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
680 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
681 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
682 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
683 | fatal ("RSA_public_encrypt error"); |
|
|
684 | |
695 | |
685 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
696 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
686 | |
697 | |
687 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
698 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
688 | |
699 | |
… | |
… | |
722 | } |
733 | } |
723 | |
734 | |
724 | void |
735 | void |
725 | connection::establish_connection_cb (time_watcher &w) |
736 | connection::establish_connection_cb (time_watcher &w) |
726 | { |
737 | { |
727 | if (ictx || conf == THISNODE |
738 | if (!ictx |
|
|
739 | && conf != THISNODE |
728 | || connectmode == conf_node::C_NEVER |
740 | && connectmode != conf_node::C_NEVER |
729 | || connectmode == conf_node::C_DISABLED) |
741 | && connectmode != conf_node::C_DISABLED |
730 | w.at = TSTAMP_CANCEL; |
742 | && NOW > w.at) |
731 | else if (w.at <= NOW) |
|
|
732 | { |
743 | { |
733 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
744 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
734 | |
745 | |
735 | if (retry_int < 3600 * 8) |
746 | double retry_int = double (retry_cnt & 3 |
736 | retry_cnt++; |
747 | ? (retry_cnt & 3) + 1 |
737 | |
748 | : 1 << (retry_cnt >> 2)); |
738 | w.at = NOW + retry_int; |
|
|
739 | |
749 | |
740 | reset_si (); |
750 | reset_si (); |
|
|
751 | |
|
|
752 | bool slow = si.prot & PROT_SLOW; |
741 | |
753 | |
742 | if (si.prot && !si.host) |
754 | if (si.prot && !si.host) |
743 | vpn->send_connect_request (conf->id); |
755 | vpn->send_connect_request (conf->id); |
744 | else |
756 | else |
745 | { |
757 | { |
746 | const sockinfo &dsi = forward_si (si); |
758 | const sockinfo &dsi = forward_si (si); |
|
|
759 | |
|
|
760 | slow = slow || (dsi.prot & PROT_SLOW); |
747 | |
761 | |
748 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
762 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
749 | { |
763 | { |
750 | if (retry_cnt < 4) |
764 | if (retry_cnt < 4) |
751 | send_auth_request (dsi, true); |
765 | send_auth_request (dsi, true); |
752 | else |
766 | else |
753 | send_ping (dsi, 0); |
767 | send_ping (dsi, 0); |
754 | } |
768 | } |
755 | } |
769 | } |
|
|
770 | |
|
|
771 | retry_int *= slow ? 8. : 0.7; |
|
|
772 | |
|
|
773 | if (retry_int < conf->max_retry) |
|
|
774 | retry_cnt++; |
|
|
775 | else |
|
|
776 | retry_int = conf->max_retry; |
|
|
777 | |
|
|
778 | w.start (NOW + retry_int); |
756 | } |
779 | } |
757 | } |
780 | } |
758 | |
781 | |
759 | void |
782 | void |
760 | connection::reset_connection () |
783 | connection::reset_connection () |
… | |
… | |
763 | { |
786 | { |
764 | slog (L_INFO, _("%s(%s): connection lost"), |
787 | slog (L_INFO, _("%s(%s): connection lost"), |
765 | conf->nodename, (const char *)si); |
788 | conf->nodename, (const char *)si); |
766 | |
789 | |
767 | if (::conf.script_node_down) |
790 | if (::conf.script_node_down) |
768 | run_script (run_script_cb (this, &connection::script_node_down), false); |
791 | if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
|
|
792 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
769 | } |
793 | } |
770 | |
794 | |
771 | delete ictx; ictx = 0; |
795 | delete ictx; ictx = 0; |
772 | delete octx; octx = 0; |
796 | delete octx; octx = 0; |
|
|
797 | #if ENABLE_DNS |
|
|
798 | dnsv4_reset_connection (); |
|
|
799 | #endif |
773 | |
800 | |
774 | si.host= 0; |
801 | si.host = 0; |
775 | |
802 | |
776 | last_activity = 0; |
803 | last_activity = 0; |
777 | retry_cnt = 0; |
804 | retry_cnt = 0; |
778 | |
805 | |
779 | rekey.reset (); |
806 | rekey.stop (); |
780 | keepalive.reset (); |
807 | keepalive.stop (); |
781 | establish_connection.reset (); |
808 | establish_connection.stop (); |
782 | } |
809 | } |
783 | |
810 | |
784 | void |
811 | void |
785 | connection::shutdown () |
812 | connection::shutdown () |
786 | { |
813 | { |
… | |
… | |
791 | } |
818 | } |
792 | |
819 | |
793 | void |
820 | void |
794 | connection::rekey_cb (time_watcher &w) |
821 | connection::rekey_cb (time_watcher &w) |
795 | { |
822 | { |
796 | w.at = TSTAMP_CANCEL; |
|
|
797 | |
|
|
798 | reset_connection (); |
823 | reset_connection (); |
799 | establish_connection (); |
824 | establish_connection (); |
800 | } |
825 | } |
801 | |
826 | |
802 | void |
827 | void |
803 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
828 | connection::send_data_packet (tap_packet *pkt) |
804 | { |
829 | { |
805 | vpndata_packet *p = new vpndata_packet; |
830 | vpndata_packet *p = new vpndata_packet; |
806 | int tos = 0; |
831 | int tos = 0; |
807 | |
832 | |
808 | // I am not hilarious about peeking into packets, but so be it. |
833 | // I am not hilarious about peeking into packets, but so be it. |
809 | if (conf->inherit_tos |
834 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
810 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
|
|
811 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
812 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
835 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
813 | |
836 | |
814 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
837 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
815 | send_vpn_packet (p, si, tos); |
838 | send_vpn_packet (p, si, tos); |
816 | |
839 | |
817 | delete p; |
840 | delete p; |
818 | |
841 | |
819 | if (oseqno > MAX_SEQNO) |
842 | if (oseqno > MAX_SEQNO) |
820 | rekey (); |
843 | rekey (); |
821 | } |
844 | } |
822 | |
845 | |
823 | void |
846 | void |
824 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
847 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
825 | { |
848 | { |
826 | if (ictx && octx) |
849 | if (ictx && octx) |
827 | send_data_packet (pkt, broadcast); |
850 | send_data_packet (pkt); |
828 | else |
851 | else |
829 | { |
852 | { |
830 | if (!broadcast)//DDDD |
853 | if (!broadcast) |
831 | data_queue.put (new tap_packet (*pkt)); |
854 | data_queue.put (new tap_packet (*pkt)); |
832 | |
855 | |
833 | establish_connection (); |
856 | establish_connection (); |
834 | } |
857 | } |
835 | } |
858 | } |
… | |
… | |
838 | { |
861 | { |
839 | if (ictx && octx) |
862 | if (ictx && octx) |
840 | send_vpn_packet (pkt, si, tos); |
863 | send_vpn_packet (pkt, si, tos); |
841 | else |
864 | else |
842 | { |
865 | { |
843 | vpn_queue.put (new vpn_packet (*pkt)); |
866 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
844 | |
867 | |
845 | establish_connection (); |
868 | establish_connection (); |
846 | } |
869 | } |
847 | } |
870 | } |
848 | |
871 | |
… | |
… | |
907 | if (p->initiate) |
930 | if (p->initiate) |
908 | send_auth_request (rsi, false); |
931 | send_auth_request (rsi, false); |
909 | |
932 | |
910 | rsachallenge k; |
933 | rsachallenge k; |
911 | |
934 | |
912 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
935 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
913 | (unsigned char *)&p->encr, (unsigned char *)&k, |
936 | { |
914 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
915 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
937 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
916 | conf->nodename, (const char *)rsi); |
938 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
939 | break; |
|
|
940 | } |
917 | else |
941 | else |
918 | { |
942 | { |
919 | delete octx; |
943 | delete octx; |
920 | |
944 | |
921 | octx = new crypto_ctx (k, 1); |
945 | octx = new crypto_ctx (k, 1); |
922 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
946 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
923 | |
947 | |
924 | conf->protocols = p->protocols; |
948 | conf->protocols = p->protocols; |
|
|
949 | features = p->features & config_packet::get_features (); |
925 | |
950 | |
926 | send_auth_response (rsi, p->id, k); |
951 | send_auth_response (rsi, p->id, k); |
927 | |
952 | |
928 | connection_established (); |
953 | connection_established (); |
929 | |
954 | |
… | |
… | |
954 | |
979 | |
955 | rsachallenge chg; |
980 | rsachallenge chg; |
956 | |
981 | |
957 | if (!rsa_cache.find (p->id, chg)) |
982 | if (!rsa_cache.find (p->id, chg)) |
958 | { |
983 | { |
959 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
984 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
960 | conf->nodename, (const char *)rsi); |
985 | conf->nodename, (const char *)rsi); |
961 | break; |
986 | break; |
962 | } |
987 | } |
963 | else |
988 | else |
964 | { |
989 | { |
965 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
990 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
966 | |
991 | |
967 | if (!p->hmac_chk (cctx)) |
992 | if (!p->hmac_chk (cctx)) |
|
|
993 | { |
968 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
994 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
969 | "could be an attack, or just corruption or an synchronization error"), |
995 | "could be an attack, or just corruption or a synchronization error"), |
970 | conf->nodename, (const char *)rsi); |
996 | conf->nodename, (const char *)rsi); |
|
|
997 | break; |
|
|
998 | } |
971 | else |
999 | else |
972 | { |
1000 | { |
973 | rsaresponse h; |
1001 | rsaresponse h; |
974 | |
1002 | |
975 | rsa_hash (p->id, chg, h); |
1003 | rsa_hash (p->id, chg, h); |
… | |
… | |
990 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1018 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
991 | conf->nodename, (const char *)rsi, |
1019 | conf->nodename, (const char *)rsi, |
992 | p->prot_major, p->prot_minor); |
1020 | p->prot_major, p->prot_minor); |
993 | |
1021 | |
994 | if (::conf.script_node_up) |
1022 | if (::conf.script_node_up) |
995 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1023 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
|
|
1024 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
996 | |
1025 | |
997 | break; |
1026 | break; |
998 | } |
1027 | } |
999 | else |
1028 | else |
1000 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1029 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
1021 | { |
1050 | { |
1022 | vpndata_packet *p = (vpndata_packet *)pkt; |
1051 | vpndata_packet *p = (vpndata_packet *)pkt; |
1023 | |
1052 | |
1024 | if (!p->hmac_chk (ictx)) |
1053 | if (!p->hmac_chk (ictx)) |
1025 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1054 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1026 | "could be an attack, or just corruption or an synchronization error"), |
1055 | "could be an attack, or just corruption or a synchronization error"), |
1027 | conf->nodename, (const char *)rsi); |
1056 | conf->nodename, (const char *)rsi); |
1028 | else |
1057 | else |
1029 | { |
1058 | { |
1030 | u32 seqno; |
1059 | u32 seqno; |
1031 | tap_packet *d = p->unpack (this, seqno); |
1060 | tap_packet *d = p->unpack (this, seqno); |
1032 | |
1061 | |
1033 | if (iseqno.recv_ok (seqno)) |
1062 | if (iseqno.recv_ok (seqno)) |
1034 | { |
1063 | { |
1035 | vpn->tap->send (d); |
1064 | vpn->tap->send (d); |
1036 | |
1065 | |
1037 | if (p->dst () == 0) // re-broadcast |
|
|
1038 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
1039 | { |
|
|
1040 | connection *c = *i; |
|
|
1041 | |
|
|
1042 | if (c->conf != THISNODE && c->conf != conf) |
|
|
1043 | c->inject_data_packet (d); |
|
|
1044 | } |
|
|
1045 | |
|
|
1046 | if (si != rsi) |
1066 | if (si != rsi) |
1047 | { |
1067 | { |
1048 | // fast re-sync on connection changes, useful especially for tcp/ip |
1068 | // fast re-sync on source address changes, useful especially for tcp/ip |
1049 | si = rsi; |
1069 | si = rsi; |
1050 | |
1070 | |
1051 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1071 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1052 | conf->nodename, (const char *)si, (const char *)rsi); |
1072 | conf->nodename, (const char *)si, (const char *)rsi); |
1053 | } |
1073 | } |
1054 | |
|
|
1055 | delete d; |
|
|
1056 | |
|
|
1057 | break; |
|
|
1058 | } |
1074 | } |
|
|
1075 | |
|
|
1076 | delete d; |
|
|
1077 | break; |
1059 | } |
1078 | } |
1060 | } |
1079 | } |
1061 | |
1080 | |
1062 | send_reset (rsi); |
1081 | send_reset (rsi); |
1063 | break; |
1082 | break; |
… | |
… | |
1088 | break; |
1107 | break; |
1089 | |
1108 | |
1090 | case vpn_packet::PT_CONNECT_INFO: |
1109 | case vpn_packet::PT_CONNECT_INFO: |
1091 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1110 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1092 | { |
1111 | { |
1093 | connect_info_packet *p = (connect_info_packet *) pkt; |
1112 | connect_info_packet *p = (connect_info_packet *)pkt; |
1094 | |
1113 | |
1095 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1114 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1096 | |
1115 | { |
1097 | connection *c = vpn->conns[p->id - 1]; |
1116 | connection *c = vpn->conns[p->id - 1]; |
1098 | |
1117 | |
1099 | c->conf->protocols = p->protocols; |
1118 | c->conf->protocols = p->protocols; |
1100 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1119 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1101 | p->si.upgrade_protocol (protocol, c->conf); |
1120 | p->si.upgrade_protocol (protocol, c->conf); |
1102 | |
1121 | |
1103 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1122 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1104 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1123 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1105 | |
1124 | |
1106 | const sockinfo &dsi = forward_si (p->si); |
1125 | const sockinfo &dsi = forward_si (p->si); |
1107 | |
1126 | |
1108 | if (dsi.valid ()) |
1127 | if (dsi.valid ()) |
1109 | c->send_auth_request (dsi, true); |
1128 | c->send_auth_request (dsi, true); |
|
|
1129 | } |
1110 | } |
1130 | } |
1111 | |
1131 | |
1112 | break; |
1132 | break; |
1113 | |
1133 | |
1114 | default: |
1134 | default: |
… | |
… | |
1123 | { |
1143 | { |
1124 | reset_connection (); |
1144 | reset_connection (); |
1125 | establish_connection (); |
1145 | establish_connection (); |
1126 | } |
1146 | } |
1127 | else if (NOW < last_activity + ::conf.keepalive) |
1147 | else if (NOW < last_activity + ::conf.keepalive) |
1128 | w.at = last_activity + ::conf.keepalive; |
1148 | w.start (last_activity + ::conf.keepalive); |
1129 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1149 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1130 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1150 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1131 | { |
1151 | { |
1132 | send_ping (si); |
1152 | send_ping (si); |
1133 | w.at = NOW + 5; |
1153 | w.start (NOW + 5); |
1134 | } |
1154 | } |
1135 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1155 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1136 | // hold ondemand connections implicitly a few seconds longer |
1156 | // hold ondemand connections implicitly a few seconds longer |
1137 | // should delete octx, though, or something like that ;) |
1157 | // should delete octx, though, or something like that ;) |
1138 | w.at = last_activity + ::conf.keepalive + 10; |
1158 | w.start (last_activity + ::conf.keepalive + 10); |
1139 | else |
1159 | else |
1140 | reset_connection (); |
1160 | reset_connection (); |
1141 | } |
1161 | } |
1142 | |
1162 | |
1143 | void connection::send_connect_request (int id) |
1163 | void connection::send_connect_request (int id) |
… | |
… | |
1149 | send_vpn_packet (p, si); |
1169 | send_vpn_packet (p, si); |
1150 | |
1170 | |
1151 | delete p; |
1171 | delete p; |
1152 | } |
1172 | } |
1153 | |
1173 | |
|
|
1174 | void connection::script_init_env (const char *ext) |
|
|
1175 | { |
|
|
1176 | char *env; |
|
|
1177 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1178 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1179 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1180 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1181 | conf->id & 0xff); putenv (env); |
|
|
1182 | } |
|
|
1183 | |
1154 | void connection::script_node () |
1184 | void connection::script_init_connect_env () |
1155 | { |
1185 | { |
1156 | vpn->script_if_up (); |
1186 | vpn->script_init_env (); |
1157 | |
1187 | |
1158 | char *env; |
1188 | char *env; |
1159 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1189 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1160 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1190 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1161 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1191 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1162 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1192 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1163 | } |
1193 | } |
1164 | |
1194 | |
1165 | const char *connection::script_node_up () |
1195 | const char *connection::script_node_up () |
1166 | { |
1196 | { |
1167 | script_node (); |
1197 | script_init_connect_env (); |
1168 | |
1198 | |
1169 | putenv ("STATE=up"); |
1199 | putenv ("STATE=up"); |
1170 | |
1200 | |
|
|
1201 | char *filename; |
|
|
1202 | asprintf (&filename, |
|
|
1203 | "%s/%s", |
|
|
1204 | confbase, |
1171 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1205 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
|
|
1206 | |
|
|
1207 | return filename; |
1172 | } |
1208 | } |
1173 | |
1209 | |
1174 | const char *connection::script_node_down () |
1210 | const char *connection::script_node_down () |
1175 | { |
1211 | { |
1176 | script_node (); |
1212 | script_init_connect_env (); |
1177 | |
1213 | |
1178 | putenv ("STATE=down"); |
1214 | putenv ("STATE=down"); |
1179 | |
1215 | |
1180 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1216 | char *filename; |
1181 | } |
1217 | asprintf (&filename, |
|
|
1218 | "%s/%s", |
|
|
1219 | confbase, |
|
|
1220 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1182 | |
1221 | |
|
|
1222 | return filename; |
|
|
1223 | } |
|
|
1224 | |
1183 | connection::connection(struct vpn *vpn_) |
1225 | connection::connection (struct vpn *vpn, conf_node *conf) |
1184 | : vpn(vpn_) |
1226 | : vpn(vpn), conf(conf) |
1185 | , rekey (this, &connection::rekey_cb) |
1227 | , rekey (this, &connection::rekey_cb) |
1186 | , keepalive (this, &connection::keepalive_cb) |
1228 | , keepalive (this, &connection::keepalive_cb) |
1187 | , establish_connection (this, &connection::establish_connection_cb) |
1229 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1230 | #if ENABLE_DNS |
|
|
1231 | , dns (0) |
|
|
1232 | #endif |
1188 | { |
1233 | { |
1189 | octx = ictx = 0; |
1234 | octx = ictx = 0; |
1190 | retry_cnt = 0; |
1235 | retry_cnt = 0; |
1191 | |
1236 | |
|
|
1237 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1238 | conf->protocols = PROT_UDPv4; |
|
|
1239 | |
1192 | connectmode = conf_node::C_ALWAYS; // initial setting |
1240 | connectmode = conf_node::C_ALWAYS; // initial setting |
1193 | reset_connection (); |
1241 | reset_connection (); |
1194 | } |
1242 | } |
1195 | |
1243 | |
1196 | connection::~connection () |
1244 | connection::~connection () |