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 | |
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21 | extern "C" { |
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22 | # include "lzf/lzf.h" |
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23 | } |
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24 | |
23 | |
25 | #include <list> |
24 | #include <list> |
26 | |
25 | |
27 | #include <openssl/rand.h> |
26 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
27 | #include <openssl/evp.h> |
29 | #include <openssl/rsa.h> |
28 | #include <openssl/rsa.h> |
30 | #include <openssl/err.h> |
29 | #include <openssl/err.h> |
31 | |
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32 | #include "gettext.h" |
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33 | |
30 | |
34 | #include "conf.h" |
31 | #include "conf.h" |
35 | #include "slog.h" |
32 | #include "slog.h" |
36 | #include "device.h" |
33 | #include "device.h" |
37 | #include "vpn.h" |
34 | #include "vpn.h" |
38 | #include "connection.h" |
35 | #include "connection.h" |
39 | |
36 | |
40 | #include <sys/socket.h> |
37 | #include "netcompat.h" |
41 | #ifdef HAVE_NETINET_IN_H |
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42 | # include <netinet/in.h> |
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43 | #endif |
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44 | #include <arpa/inet.h> |
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45 | #include <net/if.h> |
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46 | #ifdef HAVE_NETINET_IN_SYSTM_H |
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47 | # include <netinet/in_systm.h> |
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48 | #endif |
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49 | #ifdef HAVE_NETINET_IP_H |
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50 | # include <netinet/ip.h> |
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51 | #endif |
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52 | |
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53 | #ifndef IPTOS_TOS_MASK |
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54 | # define IPTOS_TOS_MASK (IPTOS_LOWDELAY | IPTOS_THROUGHPUT | IPTOS_RELIABILITY | IPTOS_MINCOST) |
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55 | #endif |
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56 | |
38 | |
57 | #if !HAVE_RAND_PSEUDO_BYTES |
39 | #if !HAVE_RAND_PSEUDO_BYTES |
58 | # define RAND_pseudo_bytes RAND_bytes |
40 | # define RAND_pseudo_bytes RAND_bytes |
59 | #endif |
41 | #endif |
60 | |
42 | |
61 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
43 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
62 | |
44 | |
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45 | #define ULTRA_FAST 1 |
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46 | #define HLOG 15 |
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47 | #include "lzf/lzf.h" |
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48 | #include "lzf/lzf_c.c" |
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49 | #include "lzf/lzf_d.c" |
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50 | |
63 | struct crypto_ctx |
51 | struct crypto_ctx |
64 | { |
52 | { |
65 | EVP_CIPHER_CTX cctx; |
53 | EVP_CIPHER_CTX cctx; |
66 | HMAC_CTX hctx; |
54 | HMAC_CTX hctx; |
67 | |
55 | |
… | |
… | |
70 | }; |
58 | }; |
71 | |
59 | |
72 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
73 | { |
61 | { |
74 | EVP_CIPHER_CTX_init (&cctx); |
62 | EVP_CIPHER_CTX_init (&cctx); |
75 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
63 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
76 | HMAC_CTX_init (&hctx); |
64 | HMAC_CTX_init (&hctx); |
77 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
78 | } |
66 | } |
79 | |
67 | |
80 | crypto_ctx::~crypto_ctx () |
68 | crypto_ctx::~crypto_ctx () |
81 | { |
69 | { |
82 | EVP_CIPHER_CTX_cleanup (&cctx); |
70 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
83 | HMAC_CTX_cleanup (&hctx); |
71 | HMAC_CTX_cleanup (&hctx); |
84 | } |
72 | } |
85 | |
73 | |
86 | static void |
74 | static void |
87 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
88 | { |
76 | { |
89 | EVP_MD_CTX ctx; |
77 | EVP_MD_CTX ctx; |
90 | |
78 | |
91 | EVP_MD_CTX_init (&ctx); |
79 | EVP_MD_CTX_init (&ctx); |
92 | EVP_DigestInit (&ctx, RSA_HASH); |
80 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
93 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
81 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
94 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
95 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
96 | EVP_MD_CTX_cleanup (&ctx); |
84 | EVP_MD_CTX_cleanup (&ctx); |
97 | } |
85 | } |
98 | |
86 | |
99 | struct rsa_entry { |
87 | struct rsa_entry { |
100 | tstamp expire; |
88 | tstamp expire; |
… | |
… | |
102 | rsachallenge chg; |
90 | rsachallenge chg; |
103 | }; |
91 | }; |
104 | |
92 | |
105 | struct rsa_cache : list<rsa_entry> |
93 | struct rsa_cache : list<rsa_entry> |
106 | { |
94 | { |
107 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
95 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
108 | |
96 | |
109 | bool find (const rsaid &id, rsachallenge &chg) |
97 | bool find (const rsaid &id, rsachallenge &chg) |
110 | { |
98 | { |
111 | for (iterator i = begin (); i != end (); ++i) |
99 | for (iterator i = begin (); i != end (); ++i) |
112 | { |
100 | { |
113 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
101 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
114 | { |
102 | { |
115 | memcpy (&chg, &i->chg, sizeof chg); |
103 | memcpy (&chg, &i->chg, sizeof chg); |
116 | |
104 | |
117 | erase (i); |
105 | erase (i); |
118 | return true; |
106 | return true; |
119 | } |
107 | } |
120 | } |
108 | } |
121 | |
109 | |
122 | if (cleaner.at < NOW) |
110 | if (!cleaner.is_active ()) |
123 | cleaner.start (NOW + RSA_TTL); |
111 | cleaner.again (); |
124 | |
112 | |
125 | return false; |
113 | return false; |
126 | } |
114 | } |
127 | |
115 | |
128 | void gen (rsaid &id, rsachallenge &chg) |
116 | void gen (rsaid &id, rsachallenge &chg) |
129 | { |
117 | { |
130 | rsa_entry e; |
118 | rsa_entry e; |
131 | |
119 | |
132 | RAND_bytes ((unsigned char *)&id, sizeof id); |
120 | RAND_bytes ((unsigned char *)&id, sizeof id); |
133 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
121 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
134 | |
122 | |
135 | e.expire = NOW + RSA_TTL; |
123 | e.expire = ev_now () + RSA_TTL; |
136 | e.id = id; |
124 | e.id = id; |
137 | memcpy (&e.chg, &chg, sizeof chg); |
125 | memcpy (&e.chg, &chg, sizeof chg); |
138 | |
126 | |
139 | push_back (e); |
127 | push_back (e); |
140 | |
128 | |
141 | if (cleaner.at < NOW) |
129 | if (!cleaner.is_active ()) |
142 | cleaner.start (NOW + RSA_TTL); |
130 | cleaner.again (); |
143 | } |
131 | } |
144 | |
132 | |
145 | rsa_cache () |
133 | rsa_cache () |
146 | : cleaner (this, &rsa_cache::cleaner_cb) |
134 | : cleaner (this, &rsa_cache::cleaner_cb) |
147 | { } |
135 | { |
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136 | cleaner.set (RSA_TTL, RSA_TTL); |
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137 | } |
148 | |
138 | |
149 | } rsa_cache; |
139 | } rsa_cache; |
150 | |
140 | |
151 | void rsa_cache::cleaner_cb (time_watcher &w) |
141 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
152 | { |
142 | { |
153 | if (empty ()) |
143 | if (empty ()) |
154 | w.at = TSTAMP_CANCEL; |
144 | w.stop (); |
155 | else |
145 | else |
156 | { |
146 | { |
157 | w.at = NOW + RSA_TTL; |
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158 | |
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159 | for (iterator i = begin (); i != end (); ) |
147 | for (iterator i = begin (); i != end (); ) |
160 | if (i->expire <= NOW) |
148 | if (i->expire <= ev_now ()) |
161 | i = erase (i); |
149 | i = erase (i); |
162 | else |
150 | else |
163 | ++i; |
151 | ++i; |
164 | } |
152 | } |
165 | } |
153 | } |
… | |
… | |
214 | // only do action once every x seconds per host whole allowing bursts. |
202 | // only do action once every x seconds per host whole allowing bursts. |
215 | // this implementation ("splay list" ;) is inefficient, |
203 | // this implementation ("splay list" ;) is inefficient, |
216 | // but low on resources. |
204 | // but low on resources. |
217 | struct net_rate_limiter : list<net_rateinfo> |
205 | struct net_rate_limiter : list<net_rateinfo> |
218 | { |
206 | { |
219 | static const double ALPHA = 1. - 1. / 600.; // allow bursts |
207 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
220 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
208 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
221 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
209 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
222 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
210 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
223 | |
211 | |
224 | bool can (const sockinfo &si) { return can((u32)si.host); } |
212 | bool can (const sockinfo &si) { return can((u32)si.host); } |
225 | bool can (u32 host); |
213 | bool can (u32 host); |
226 | }; |
214 | }; |
227 | |
215 | |
… | |
… | |
232 | iterator i; |
220 | iterator i; |
233 | |
221 | |
234 | for (i = begin (); i != end (); ) |
222 | for (i = begin (); i != end (); ) |
235 | if (i->host == host) |
223 | if (i->host == host) |
236 | break; |
224 | break; |
237 | else if (i->last < NOW - EXPIRE) |
225 | else if (i->last < ev_now () - NRL_EXPIRE) |
238 | i = erase (i); |
226 | i = erase (i); |
239 | else |
227 | else |
240 | i++; |
228 | i++; |
241 | |
229 | |
242 | if (i == end ()) |
230 | if (i == end ()) |
243 | { |
231 | { |
244 | net_rateinfo ri; |
232 | net_rateinfo ri; |
245 | |
233 | |
246 | ri.host = host; |
234 | ri.host = host; |
247 | ri.pcnt = 1.; |
235 | ri.pcnt = 1.; |
248 | ri.diff = MAXDIF; |
236 | ri.diff = NRL_MAXDIF; |
249 | ri.last = NOW; |
237 | ri.last = ev_now (); |
250 | |
238 | |
251 | push_front (ri); |
239 | push_front (ri); |
252 | |
240 | |
253 | return true; |
241 | return true; |
254 | } |
242 | } |
255 | else |
243 | else |
256 | { |
244 | { |
257 | net_rateinfo ri (*i); |
245 | net_rateinfo ri (*i); |
258 | erase (i); |
246 | erase (i); |
259 | |
247 | |
260 | ri.pcnt = ri.pcnt * ALPHA; |
248 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
261 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
249 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
262 | |
250 | |
263 | ri.last = NOW; |
251 | ri.last = ev_now (); |
264 | |
252 | |
265 | double dif = ri.diff / ri.pcnt; |
253 | double dif = ri.diff / ri.pcnt; |
266 | |
254 | |
267 | bool send = dif > CUTOFF; |
255 | bool send = dif > NRL_CUTOFF; |
268 | |
256 | |
269 | if (dif > MAXDIF) |
257 | if (dif > NRL_MAXDIF) |
270 | { |
258 | { |
271 | ri.pcnt = 1.; |
259 | ri.pcnt = 1.; |
272 | ri.diff = MAXDIF; |
260 | ri.diff = NRL_MAXDIF; |
273 | } |
261 | } |
274 | else if (send) |
262 | else if (send) |
275 | ri.pcnt++; |
263 | ri.pcnt++; |
276 | |
264 | |
277 | push_front (ri); |
265 | push_front (ri); |
… | |
… | |
324 | } |
312 | } |
325 | |
313 | |
326 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
314 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
327 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
315 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
328 | |
316 | |
329 | struct vpndata_packet:vpn_packet |
317 | struct vpndata_packet : vpn_packet |
330 | { |
318 | { |
331 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
319 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
332 | |
320 | |
333 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
321 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
334 | tap_packet *unpack (connection *conn, u32 &seqno); |
322 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
347 | int outl = 0, outl2; |
335 | int outl = 0, outl2; |
348 | ptype type = PT_DATA_UNCOMPRESSED; |
336 | ptype type = PT_DATA_UNCOMPRESSED; |
349 | |
337 | |
350 | #if ENABLE_COMPRESSION |
338 | #if ENABLE_COMPRESSION |
351 | u8 cdata[MAX_MTU]; |
339 | u8 cdata[MAX_MTU]; |
352 | u32 cl; |
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353 | |
340 | |
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341 | if (conn->features & ENABLE_COMPRESSION) |
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342 | { |
354 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
343 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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344 | |
355 | if (cl) |
345 | if (cl) |
356 | { |
346 | { |
357 | type = PT_DATA_COMPRESSED; |
347 | type = PT_DATA_COMPRESSED; |
358 | d = cdata; |
348 | d = cdata; |
359 | l = cl + 2; |
349 | l = cl + 2; |
360 | |
350 | |
361 | d[0] = cl >> 8; |
351 | d[0] = cl >> 8; |
362 | d[1] = cl; |
352 | d[1] = cl; |
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353 | } |
363 | } |
354 | } |
364 | #endif |
355 | #endif |
365 | |
356 | |
366 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
357 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
367 | |
358 | |
368 | struct { |
359 | struct { |
369 | #if RAND_SIZE |
360 | #if RAND_SIZE |
370 | u8 rnd[RAND_SIZE]; |
361 | u8 rnd[RAND_SIZE]; |
371 | #endif |
362 | #endif |
… | |
… | |
375 | datahdr.seqno = ntohl (seqno); |
366 | datahdr.seqno = ntohl (seqno); |
376 | #if RAND_SIZE |
367 | #if RAND_SIZE |
377 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
368 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
378 | #endif |
369 | #endif |
379 | |
370 | |
380 | EVP_EncryptUpdate (cctx, |
371 | require (EVP_EncryptUpdate (cctx, |
381 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) data + outl, &outl2, |
382 | (unsigned char *) &datahdr, DATAHDR); |
373 | (unsigned char *) &datahdr, DATAHDR)); |
383 | outl += outl2; |
374 | outl += outl2; |
384 | |
375 | |
385 | EVP_EncryptUpdate (cctx, |
376 | require (EVP_EncryptUpdate (cctx, |
386 | (unsigned char *) data + outl, &outl2, |
377 | (unsigned char *) data + outl, &outl2, |
387 | (unsigned char *) d, l); |
378 | (unsigned char *) d, l)); |
388 | outl += outl2; |
379 | outl += outl2; |
389 | |
380 | |
390 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
381 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
391 | outl += outl2; |
382 | outl += outl2; |
392 | |
383 | |
393 | len = outl + data_hdr_size (); |
384 | len = outl + data_hdr_size (); |
394 | |
385 | |
395 | set_hdr (type, dst); |
386 | set_hdr (type, dst); |
… | |
… | |
404 | int outl = 0, outl2; |
395 | int outl = 0, outl2; |
405 | tap_packet *p = new tap_packet; |
396 | tap_packet *p = new tap_packet; |
406 | u8 *d; |
397 | u8 *d; |
407 | u32 l = len - data_hdr_size (); |
398 | u32 l = len - data_hdr_size (); |
408 | |
399 | |
409 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
400 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
410 | |
401 | |
411 | #if ENABLE_COMPRESSION |
402 | #if ENABLE_COMPRESSION |
412 | u8 cdata[MAX_MTU]; |
403 | u8 cdata[MAX_MTU]; |
413 | |
404 | |
414 | if (type == PT_DATA_COMPRESSED) |
405 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
416 | else |
407 | else |
417 | #endif |
408 | #endif |
418 | d = &(*p)[6 + 6 - DATAHDR]; |
409 | d = &(*p)[6 + 6 - DATAHDR]; |
419 | |
410 | |
420 | /* this overwrites part of the src mac, but we fix that later */ |
411 | /* this overwrites part of the src mac, but we fix that later */ |
421 | EVP_DecryptUpdate (cctx, |
412 | require (EVP_DecryptUpdate (cctx, |
422 | d, &outl2, |
413 | d, &outl2, |
423 | (unsigned char *)&data, len - data_hdr_size ()); |
414 | (unsigned char *)&data, len - data_hdr_size ())); |
424 | outl += outl2; |
415 | outl += outl2; |
425 | |
416 | |
426 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
417 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
427 | outl += outl2; |
418 | outl += outl2; |
428 | |
419 | |
429 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
420 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
430 | |
421 | |
431 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
422 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
460 | { |
451 | { |
461 | // actually, hmaclen cannot be checked because the hmac |
452 | // actually, hmaclen cannot be checked because the hmac |
462 | // field comes before this data, so peers with other |
453 | // field comes before this data, so peers with other |
463 | // hmacs simply will not work. |
454 | // hmacs simply will not work. |
464 | u8 prot_major, prot_minor, randsize, hmaclen; |
455 | u8 prot_major, prot_minor, randsize, hmaclen; |
465 | u8 flags, challengelen, pad2, pad3; |
456 | u8 flags, challengelen, features, pad3; |
466 | u32 cipher_nid, digest_nid, hmac_nid; |
457 | u32 cipher_nid, digest_nid, hmac_nid; |
467 | |
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468 | const u8 curflags () const |
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469 | { |
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470 | return 0x80 |
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471 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
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472 | } |
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473 | |
458 | |
474 | void setup (ptype type, int dst); |
459 | void setup (ptype type, int dst); |
475 | bool chk_config () const; |
460 | bool chk_config () const; |
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461 | |
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462 | static u8 get_features () |
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463 | { |
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464 | u8 f = 0; |
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|
465 | #if ENABLE_COMPRESSION |
|
|
466 | f |= FEATURE_COMPRESSION; |
|
|
467 | #endif |
|
|
468 | #if ENABLE_ROHC |
|
|
469 | f |= FEATURE_ROHC; |
|
|
470 | #endif |
|
|
471 | #if ENABLE_BRIDGING |
|
|
472 | f |= FEATURE_BRIDGING; |
|
|
473 | #endif |
|
|
474 | return f; |
|
|
475 | } |
476 | }; |
476 | }; |
477 | |
477 | |
478 | void config_packet::setup (ptype type, int dst) |
478 | void config_packet::setup (ptype type, int dst) |
479 | { |
479 | { |
480 | prot_major = PROTOCOL_MAJOR; |
480 | prot_major = PROTOCOL_MAJOR; |
481 | prot_minor = PROTOCOL_MINOR; |
481 | prot_minor = PROTOCOL_MINOR; |
482 | randsize = RAND_SIZE; |
482 | randsize = RAND_SIZE; |
483 | hmaclen = HMACLENGTH; |
483 | hmaclen = HMACLENGTH; |
484 | flags = curflags (); |
484 | flags = 0; |
485 | challengelen = sizeof (rsachallenge); |
485 | challengelen = sizeof (rsachallenge); |
|
|
486 | features = get_features (); |
486 | |
487 | |
487 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
488 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
488 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
489 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
489 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
490 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
490 | |
491 | |
… | |
… | |
493 | } |
494 | } |
494 | |
495 | |
495 | bool config_packet::chk_config () const |
496 | bool config_packet::chk_config () const |
496 | { |
497 | { |
497 | if (prot_major != PROTOCOL_MAJOR) |
498 | if (prot_major != PROTOCOL_MAJOR) |
498 | slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); |
499 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
499 | else if (randsize != RAND_SIZE) |
500 | else if (randsize != RAND_SIZE) |
500 | slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); |
501 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
501 | else if (hmaclen != HMACLENGTH) |
502 | else if (hmaclen != HMACLENGTH) |
502 | slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
503 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
503 | else if (flags != curflags ()) |
|
|
504 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
|
|
505 | else if (challengelen != sizeof (rsachallenge)) |
504 | else if (challengelen != sizeof (rsachallenge)) |
506 | slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); |
505 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
507 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
506 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
508 | slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
507 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
509 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
508 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
510 | slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
509 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
511 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
510 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
512 | slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
511 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
513 | else |
512 | else |
514 | return true; |
513 | return true; |
515 | |
514 | |
516 | return false; |
515 | return false; |
517 | } |
516 | } |
518 | |
517 | |
519 | struct auth_req_packet : config_packet |
518 | struct auth_req_packet : config_packet |
520 | { |
519 | { |
521 | char magic[8]; |
520 | char magic[8]; |
522 | u8 initiate; // false if this is just an automatic reply |
521 | u8 initiate; // false if this is just an automatic reply |
523 | u8 protocols; // supported protocols (will get patches on forward) |
522 | u8 protocols; // supported protocols (will be patched on forward) |
524 | u8 pad2, pad3; |
523 | u8 pad2, pad3; |
525 | rsaid id; |
524 | rsaid id; |
526 | rsaencrdata encr; |
525 | rsaencrdata encr; |
527 | |
526 | |
528 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
527 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
585 | ///////////////////////////////////////////////////////////////////////////// |
584 | ///////////////////////////////////////////////////////////////////////////// |
586 | |
585 | |
587 | void |
586 | void |
588 | connection::connection_established () |
587 | connection::connection_established () |
589 | { |
588 | { |
|
|
589 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
|
|
590 | |
590 | if (ictx && octx) |
591 | if (ictx && octx) |
591 | { |
592 | { |
592 | connectmode = conf->connectmode; |
593 | connectmode = conf->connectmode; |
593 | |
594 | |
594 | rekey.start (NOW + ::conf.rekey); |
595 | // make sure rekeying timeouts are slightly asymmetric |
|
|
596 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
|
|
597 | rekey.start (rekey_interval, rekey_interval); |
595 | keepalive.start (NOW + ::conf.keepalive); |
598 | keepalive.start (::conf.keepalive); |
596 | |
599 | |
597 | // send queued packets |
600 | // send queued packets |
598 | if (ictx && octx) |
601 | if (ictx && octx) |
599 | { |
602 | { |
600 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
603 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
… | |
… | |
611 | } |
614 | } |
612 | } |
615 | } |
613 | else |
616 | else |
614 | { |
617 | { |
615 | retry_cnt = 0; |
618 | retry_cnt = 0; |
616 | establish_connection.start (NOW + 5); |
619 | establish_connection.start (5); |
617 | keepalive.reset (); |
620 | keepalive.stop (); |
618 | rekey.reset (); |
621 | rekey.stop (); |
619 | } |
622 | } |
620 | } |
623 | } |
621 | |
624 | |
622 | void |
625 | void |
623 | connection::reset_si () |
626 | connection::reset_si () |
… | |
… | |
625 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
628 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
626 | |
629 | |
627 | // mask out protocols we cannot establish |
630 | // mask out protocols we cannot establish |
628 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
631 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
629 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
632 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
633 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
634 | |
|
|
635 | if (protocol |
|
|
636 | && (!conf->can_direct (THISNODE) |
|
|
637 | || !THISNODE->can_direct (conf))) |
|
|
638 | { |
|
|
639 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
|
|
640 | protocol = 0; |
|
|
641 | } |
630 | |
642 | |
631 | si.set (conf, protocol); |
643 | si.set (conf, protocol); |
632 | } |
644 | } |
633 | |
645 | |
634 | // ensure sockinfo is valid, forward if necessary |
646 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
639 | { |
651 | { |
640 | connection *r = vpn->find_router (); |
652 | connection *r = vpn->find_router (); |
641 | |
653 | |
642 | if (r) |
654 | if (r) |
643 | { |
655 | { |
644 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
656 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
645 | conf->nodename, r->conf->nodename); |
657 | conf->nodename, r->conf->nodename, (const char *)r->si); |
646 | return r->si; |
658 | return r->si; |
647 | } |
659 | } |
648 | else |
660 | else |
649 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
661 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
650 | conf->nodename); |
662 | conf->nodename); |
… | |
… | |
689 | connection::send_auth_request (const sockinfo &si, bool initiate) |
701 | connection::send_auth_request (const sockinfo &si, bool initiate) |
690 | { |
702 | { |
691 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
703 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
692 | |
704 | |
693 | rsachallenge chg; |
705 | rsachallenge chg; |
694 | |
|
|
695 | rsa_cache.gen (pkt->id, chg); |
706 | rsa_cache.gen (pkt->id, chg); |
696 | |
707 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
697 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
698 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
699 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
700 | fatal ("RSA_public_encrypt error"); |
|
|
701 | |
708 | |
702 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
709 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
703 | |
710 | |
704 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
711 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
705 | |
712 | |
… | |
… | |
725 | } |
732 | } |
726 | |
733 | |
727 | void |
734 | void |
728 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
735 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
729 | { |
736 | { |
730 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
737 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
731 | conf->id, rid, (const char *)rsi); |
738 | conf->id, rid, (const char *)rsi); |
732 | |
739 | |
733 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
740 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
734 | |
741 | |
735 | r->hmac_set (octx); |
742 | r->hmac_set (octx); |
… | |
… | |
737 | |
744 | |
738 | delete r; |
745 | delete r; |
739 | } |
746 | } |
740 | |
747 | |
741 | void |
748 | void |
742 | connection::establish_connection_cb (time_watcher &w) |
749 | connection::establish_connection_cb (ev::timer &w, int revents) |
743 | { |
750 | { |
744 | if (ictx || conf == THISNODE |
751 | if (!ictx |
|
|
752 | && conf != THISNODE |
745 | || connectmode == conf_node::C_NEVER |
753 | && connectmode != conf_node::C_NEVER |
746 | || connectmode == conf_node::C_DISABLED) |
754 | && connectmode != conf_node::C_DISABLED |
747 | w.at = TSTAMP_CANCEL; |
755 | && !w.is_active ()) |
748 | else if (w.at <= NOW) |
|
|
749 | { |
756 | { |
750 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
757 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
751 | |
758 | ? (retry_cnt & 3) + 1 |
752 | if (retry_int < 3600 * 8) |
759 | : 1 << (retry_cnt >> 2)); |
753 | retry_cnt++; |
|
|
754 | |
|
|
755 | w.at = NOW + retry_int; |
|
|
756 | |
760 | |
757 | reset_si (); |
761 | reset_si (); |
758 | |
762 | |
|
|
763 | bool slow = si.prot & PROT_SLOW; |
|
|
764 | |
759 | if (si.prot && !si.host) |
765 | if (si.prot && !si.host) |
|
|
766 | { |
|
|
767 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
768 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
769 | w.start (1); |
760 | vpn->send_connect_request (conf->id); |
770 | vpn->send_connect_request (conf->id); |
|
|
771 | } |
761 | else |
772 | else |
762 | { |
773 | { |
|
|
774 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
|
|
775 | |
763 | const sockinfo &dsi = forward_si (si); |
776 | const sockinfo &dsi = forward_si (si); |
|
|
777 | |
|
|
778 | slow = slow || (dsi.prot & PROT_SLOW); |
764 | |
779 | |
765 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
780 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
766 | { |
781 | { |
767 | if (retry_cnt < 4) |
782 | if (retry_cnt < 4) |
768 | send_auth_request (dsi, true); |
783 | send_auth_request (dsi, true); |
769 | else |
784 | else |
770 | send_ping (dsi, 0); |
785 | send_ping (dsi, 0); |
771 | } |
786 | } |
772 | } |
787 | } |
|
|
788 | |
|
|
789 | retry_int *= slow ? 8. : 0.7; |
|
|
790 | |
|
|
791 | if (retry_int < conf->max_retry) |
|
|
792 | retry_cnt++; |
|
|
793 | else |
|
|
794 | retry_int = conf->max_retry; |
|
|
795 | |
|
|
796 | w.start (retry_int); |
773 | } |
797 | } |
774 | } |
798 | } |
775 | |
799 | |
776 | void |
800 | void |
777 | connection::reset_connection () |
801 | connection::reset_connection () |
… | |
… | |
780 | { |
804 | { |
781 | slog (L_INFO, _("%s(%s): connection lost"), |
805 | slog (L_INFO, _("%s(%s): connection lost"), |
782 | conf->nodename, (const char *)si); |
806 | conf->nodename, (const char *)si); |
783 | |
807 | |
784 | if (::conf.script_node_down) |
808 | if (::conf.script_node_down) |
785 | run_script (run_script_cb (this, &connection::script_node_down), false); |
809 | if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
|
|
810 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
786 | } |
811 | } |
787 | |
812 | |
788 | delete ictx; ictx = 0; |
813 | delete ictx; ictx = 0; |
789 | delete octx; octx = 0; |
814 | delete octx; octx = 0; |
|
|
815 | #if ENABLE_DNS |
|
|
816 | dnsv4_reset_connection (); |
|
|
817 | #endif |
790 | |
818 | |
791 | si.host= 0; |
819 | si.host = 0; |
792 | |
820 | |
793 | last_activity = 0; |
821 | last_activity = 0; |
794 | retry_cnt = 0; |
822 | retry_cnt = 0; |
795 | |
823 | |
796 | rekey.reset (); |
824 | rekey.stop (); |
797 | keepalive.reset (); |
825 | keepalive.stop (); |
798 | establish_connection.reset (); |
826 | establish_connection.stop (); |
799 | } |
827 | } |
800 | |
828 | |
801 | void |
829 | void |
802 | connection::shutdown () |
830 | connection::shutdown () |
803 | { |
831 | { |
… | |
… | |
806 | |
834 | |
807 | reset_connection (); |
835 | reset_connection (); |
808 | } |
836 | } |
809 | |
837 | |
810 | void |
838 | void |
811 | connection::rekey_cb (time_watcher &w) |
839 | connection::rekey_cb (ev::timer &w, int revents) |
812 | { |
840 | { |
813 | w.at = TSTAMP_CANCEL; |
|
|
814 | |
|
|
815 | reset_connection (); |
841 | reset_connection (); |
816 | establish_connection (); |
842 | establish_connection (); |
817 | } |
843 | } |
818 | |
844 | |
819 | void |
845 | void |
820 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
846 | connection::send_data_packet (tap_packet *pkt) |
821 | { |
847 | { |
822 | vpndata_packet *p = new vpndata_packet; |
848 | vpndata_packet *p = new vpndata_packet; |
823 | int tos = 0; |
849 | int tos = 0; |
824 | |
850 | |
825 | // I am not hilarious about peeking into packets, but so be it. |
851 | // I am not hilarious about peeking into packets, but so be it. |
826 | if (conf->inherit_tos |
852 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
827 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
|
|
828 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
829 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
853 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
830 | |
854 | |
831 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
855 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
832 | send_vpn_packet (p, si, tos); |
856 | send_vpn_packet (p, si, tos); |
833 | |
857 | |
834 | delete p; |
858 | delete p; |
835 | |
859 | |
836 | if (oseqno > MAX_SEQNO) |
860 | if (oseqno > MAX_SEQNO) |
837 | rekey (); |
861 | rekey (); |
838 | } |
862 | } |
839 | |
863 | |
840 | void |
864 | void |
841 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
865 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
842 | { |
866 | { |
843 | if (ictx && octx) |
867 | if (ictx && octx) |
844 | send_data_packet (pkt, broadcast); |
868 | send_data_packet (pkt); |
845 | else |
869 | else |
846 | { |
870 | { |
847 | if (!broadcast)//DDDD |
871 | if (!broadcast) |
848 | data_queue.put (new tap_packet (*pkt)); |
872 | data_queue.put (new tap_packet (*pkt)); |
849 | |
873 | |
850 | establish_connection (); |
874 | establish_connection (); |
851 | } |
875 | } |
852 | } |
876 | } |
… | |
… | |
855 | { |
879 | { |
856 | if (ictx && octx) |
880 | if (ictx && octx) |
857 | send_vpn_packet (pkt, si, tos); |
881 | send_vpn_packet (pkt, si, tos); |
858 | else |
882 | else |
859 | { |
883 | { |
860 | vpn_queue.put (new vpn_packet (*pkt)); |
884 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
861 | |
885 | |
862 | establish_connection (); |
886 | establish_connection (); |
863 | } |
887 | } |
864 | } |
888 | } |
865 | |
889 | |
866 | void |
890 | void |
867 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
891 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
868 | { |
892 | { |
869 | last_activity = NOW; |
893 | last_activity = ev_now (); |
870 | |
894 | |
871 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
895 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
872 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
896 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
897 | |
|
|
898 | if (connectmode == conf_node::C_DISABLED) |
|
|
899 | return; |
873 | |
900 | |
874 | switch (pkt->typ ()) |
901 | switch (pkt->typ ()) |
875 | { |
902 | { |
876 | case vpn_packet::PT_PING: |
903 | case vpn_packet::PT_PING: |
877 | // we send pings instead of auth packets after some retries, |
904 | // we send pings instead of auth packets after some retries, |
… | |
… | |
924 | if (p->initiate) |
951 | if (p->initiate) |
925 | send_auth_request (rsi, false); |
952 | send_auth_request (rsi, false); |
926 | |
953 | |
927 | rsachallenge k; |
954 | rsachallenge k; |
928 | |
955 | |
929 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
956 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
930 | (unsigned char *)&p->encr, (unsigned char *)&k, |
957 | { |
931 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
932 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
958 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
933 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
959 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
960 | break; |
|
|
961 | } |
934 | else |
962 | else |
935 | { |
963 | { |
936 | delete octx; |
964 | delete octx; |
937 | |
965 | |
938 | octx = new crypto_ctx (k, 1); |
966 | octx = new crypto_ctx (k, 1); |
939 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
967 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
940 | |
968 | |
941 | conf->protocols = p->protocols; |
969 | conf->protocols = p->protocols; |
|
|
970 | features = p->features & config_packet::get_features (); |
942 | |
971 | |
943 | send_auth_response (rsi, p->id, k); |
972 | send_auth_response (rsi, p->id, k); |
944 | |
973 | |
945 | connection_established (); |
974 | connection_established (); |
946 | |
975 | |
… | |
… | |
982 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1011 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
983 | |
1012 | |
984 | if (!p->hmac_chk (cctx)) |
1013 | if (!p->hmac_chk (cctx)) |
985 | { |
1014 | { |
986 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1015 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
987 | "could be an attack, or just corruption or an synchronization error"), |
1016 | "could be an attack, or just corruption or a synchronization error"), |
988 | conf->nodename, (const char *)rsi); |
1017 | conf->nodename, (const char *)rsi); |
989 | break; |
1018 | break; |
990 | } |
1019 | } |
991 | else |
1020 | else |
992 | { |
1021 | { |
… | |
… | |
1010 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1039 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1011 | conf->nodename, (const char *)rsi, |
1040 | conf->nodename, (const char *)rsi, |
1012 | p->prot_major, p->prot_minor); |
1041 | p->prot_major, p->prot_minor); |
1013 | |
1042 | |
1014 | if (::conf.script_node_up) |
1043 | if (::conf.script_node_up) |
1015 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1044 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
|
|
1045 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
1016 | |
1046 | |
1017 | break; |
1047 | break; |
1018 | } |
1048 | } |
1019 | else |
1049 | else |
1020 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1050 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
1041 | { |
1071 | { |
1042 | vpndata_packet *p = (vpndata_packet *)pkt; |
1072 | vpndata_packet *p = (vpndata_packet *)pkt; |
1043 | |
1073 | |
1044 | if (!p->hmac_chk (ictx)) |
1074 | if (!p->hmac_chk (ictx)) |
1045 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1075 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1046 | "could be an attack, or just corruption or an synchronization error"), |
1076 | "could be an attack, or just corruption or a synchronization error"), |
1047 | conf->nodename, (const char *)rsi); |
1077 | conf->nodename, (const char *)rsi); |
1048 | else |
1078 | else |
1049 | { |
1079 | { |
1050 | u32 seqno; |
1080 | u32 seqno; |
1051 | tap_packet *d = p->unpack (this, seqno); |
1081 | tap_packet *d = p->unpack (this, seqno); |
1052 | |
1082 | |
1053 | if (iseqno.recv_ok (seqno)) |
1083 | if (iseqno.recv_ok (seqno)) |
1054 | { |
1084 | { |
1055 | vpn->tap->send (d); |
1085 | vpn->tap->send (d); |
1056 | |
1086 | |
1057 | if (p->dst () == 0) // re-broadcast |
|
|
1058 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
1059 | { |
|
|
1060 | connection *c = *i; |
|
|
1061 | |
|
|
1062 | if (c->conf != THISNODE && c->conf != conf) |
|
|
1063 | c->inject_data_packet (d); |
|
|
1064 | } |
|
|
1065 | |
|
|
1066 | if (si != rsi) |
1087 | if (si != rsi) |
1067 | { |
1088 | { |
1068 | // fast re-sync on connection changes, useful especially for tcp/ip |
1089 | // fast re-sync on source address changes, useful especially for tcp/ip |
1069 | si = rsi; |
1090 | si = rsi; |
1070 | |
1091 | |
1071 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1092 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1072 | conf->nodename, (const char *)si, (const char *)rsi); |
1093 | conf->nodename, (const char *)si, (const char *)rsi); |
1073 | } |
1094 | } |
1074 | |
|
|
1075 | delete d; |
|
|
1076 | |
|
|
1077 | break; |
|
|
1078 | } |
1095 | } |
|
|
1096 | |
|
|
1097 | delete d; |
|
|
1098 | break; |
1079 | } |
1099 | } |
1080 | } |
1100 | } |
1081 | |
1101 | |
1082 | send_reset (rsi); |
1102 | send_reset (rsi); |
1083 | break; |
1103 | break; |
… | |
… | |
1085 | case vpn_packet::PT_CONNECT_REQ: |
1105 | case vpn_packet::PT_CONNECT_REQ: |
1086 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1106 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1087 | { |
1107 | { |
1088 | connect_req_packet *p = (connect_req_packet *) pkt; |
1108 | connect_req_packet *p = (connect_req_packet *) pkt; |
1089 | |
1109 | |
1090 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1110 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1091 | connection *c = vpn->conns[p->id - 1]; |
|
|
1092 | conf->protocols = p->protocols; |
|
|
1093 | |
|
|
1094 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1095 | conf->id, p->id, c->ictx && c->octx); |
|
|
1096 | |
|
|
1097 | if (c->ictx && c->octx) |
|
|
1098 | { |
1111 | { |
|
|
1112 | connection *c = vpn->conns[p->id - 1]; |
|
|
1113 | conf->protocols = p->protocols; |
|
|
1114 | |
|
|
1115 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
|
|
1116 | conf->id, p->id, c->ictx && c->octx); |
|
|
1117 | |
|
|
1118 | if (c->ictx && c->octx) |
|
|
1119 | { |
1099 | // send connect_info packets to both sides, in case one is |
1120 | // send connect_info packets to both sides, in case one is |
1100 | // behind a nat firewall (or both ;) |
1121 | // behind a nat firewall (or both ;) |
1101 | c->send_connect_info (conf->id, si, conf->protocols); |
1122 | c->send_connect_info (conf->id, si, conf->protocols); |
1102 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1123 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1124 | } |
|
|
1125 | else |
|
|
1126 | c->establish_connection (); |
1103 | } |
1127 | } |
1104 | else |
1128 | else |
1105 | c->establish_connection (); |
1129 | slog (L_WARN, |
|
|
1130 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1131 | p->id); |
1106 | } |
1132 | } |
1107 | |
1133 | |
1108 | break; |
1134 | break; |
1109 | |
1135 | |
1110 | case vpn_packet::PT_CONNECT_INFO: |
1136 | case vpn_packet::PT_CONNECT_INFO: |
1111 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1137 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1112 | { |
1138 | { |
1113 | connect_info_packet *p = (connect_info_packet *) pkt; |
1139 | connect_info_packet *p = (connect_info_packet *)pkt; |
1114 | |
1140 | |
1115 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1141 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1116 | |
1142 | { |
1117 | connection *c = vpn->conns[p->id - 1]; |
1143 | connection *c = vpn->conns[p->id - 1]; |
1118 | |
1144 | |
1119 | c->conf->protocols = p->protocols; |
1145 | c->conf->protocols = p->protocols; |
1120 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1146 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1121 | p->si.upgrade_protocol (protocol, c->conf); |
1147 | p->si.upgrade_protocol (protocol, c->conf); |
1122 | |
1148 | |
1123 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1149 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1124 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1150 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1125 | |
1151 | |
1126 | const sockinfo &dsi = forward_si (p->si); |
1152 | const sockinfo &dsi = forward_si (p->si); |
1127 | |
1153 | |
1128 | if (dsi.valid ()) |
1154 | if (dsi.valid ()) |
1129 | c->send_auth_request (dsi, true); |
1155 | c->send_auth_request (dsi, true); |
|
|
1156 | } |
|
|
1157 | else |
|
|
1158 | slog (L_WARN, |
|
|
1159 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1160 | p->id); |
1130 | } |
1161 | } |
1131 | |
1162 | |
1132 | break; |
1163 | break; |
1133 | |
1164 | |
1134 | default: |
1165 | default: |
1135 | send_reset (rsi); |
1166 | send_reset (rsi); |
1136 | break; |
1167 | break; |
1137 | } |
1168 | } |
1138 | } |
1169 | } |
1139 | |
1170 | |
1140 | void connection::keepalive_cb (time_watcher &w) |
1171 | void connection::keepalive_cb (ev::timer &w, int revents) |
1141 | { |
1172 | { |
1142 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1173 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1143 | { |
1174 | { |
1144 | reset_connection (); |
1175 | reset_connection (); |
1145 | establish_connection (); |
1176 | establish_connection (); |
1146 | } |
1177 | } |
1147 | else if (NOW < last_activity + ::conf.keepalive) |
1178 | else if (ev_now () < last_activity + ::conf.keepalive) |
1148 | w.at = last_activity + ::conf.keepalive; |
1179 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1149 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1180 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1150 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1181 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1151 | { |
1182 | { |
1152 | send_ping (si); |
1183 | send_ping (si); |
1153 | w.at = NOW + 5; |
1184 | w.start (5); |
1154 | } |
1185 | } |
1155 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1186 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1156 | // hold ondemand connections implicitly a few seconds longer |
1187 | // hold ondemand connections implicitly a few seconds longer |
1157 | // should delete octx, though, or something like that ;) |
1188 | // should delete octx, though, or something like that ;) |
1158 | w.at = last_activity + ::conf.keepalive + 10; |
1189 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1159 | else |
1190 | else |
1160 | reset_connection (); |
1191 | reset_connection (); |
1161 | } |
1192 | } |
1162 | |
1193 | |
1163 | void connection::send_connect_request (int id) |
1194 | void connection::send_connect_request (int id) |
… | |
… | |
1169 | send_vpn_packet (p, si); |
1200 | send_vpn_packet (p, si); |
1170 | |
1201 | |
1171 | delete p; |
1202 | delete p; |
1172 | } |
1203 | } |
1173 | |
1204 | |
|
|
1205 | void connection::script_init_env (const char *ext) |
|
|
1206 | { |
|
|
1207 | char *env; |
|
|
1208 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1209 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1210 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1211 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1212 | conf->id & 0xff); putenv (env); |
|
|
1213 | } |
|
|
1214 | |
1174 | void connection::script_node () |
1215 | void connection::script_init_connect_env () |
1175 | { |
1216 | { |
1176 | vpn->script_if_up (); |
1217 | vpn->script_init_env (); |
1177 | |
1218 | |
1178 | char *env; |
1219 | char *env; |
1179 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1220 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1180 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1221 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1181 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1222 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1182 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1223 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1183 | } |
1224 | } |
1184 | |
1225 | |
1185 | const char *connection::script_node_up () |
1226 | const char *connection::script_node_up () |
1186 | { |
1227 | { |
1187 | script_node (); |
1228 | script_init_connect_env (); |
1188 | |
1229 | |
1189 | putenv ("STATE=up"); |
1230 | putenv ((char *)"STATE=up"); |
1190 | |
1231 | |
|
|
1232 | char *filename; |
|
|
1233 | asprintf (&filename, |
|
|
1234 | "%s/%s", |
|
|
1235 | confbase, |
1191 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1236 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
|
|
1237 | |
|
|
1238 | return filename; |
1192 | } |
1239 | } |
1193 | |
1240 | |
1194 | const char *connection::script_node_down () |
1241 | const char *connection::script_node_down () |
1195 | { |
1242 | { |
1196 | script_node (); |
1243 | script_init_connect_env (); |
1197 | |
1244 | |
1198 | putenv ("STATE=down"); |
1245 | putenv ((char *)"STATE=down"); |
1199 | |
1246 | |
1200 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1247 | char *filename; |
1201 | } |
1248 | asprintf (&filename, |
|
|
1249 | "%s/%s", |
|
|
1250 | confbase, |
|
|
1251 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1202 | |
1252 | |
|
|
1253 | return filename; |
|
|
1254 | } |
|
|
1255 | |
1203 | connection::connection(struct vpn *vpn_) |
1256 | connection::connection (struct vpn *vpn, conf_node *conf) |
1204 | : vpn(vpn_) |
1257 | : vpn(vpn), conf(conf) |
1205 | , rekey (this, &connection::rekey_cb) |
1258 | , rekey (this, &connection::rekey_cb) |
1206 | , keepalive (this, &connection::keepalive_cb) |
1259 | , keepalive (this, &connection::keepalive_cb) |
1207 | , establish_connection (this, &connection::establish_connection_cb) |
1260 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1261 | #if ENABLE_DNS |
|
|
1262 | , dns (0) |
|
|
1263 | #endif |
1208 | { |
1264 | { |
1209 | octx = ictx = 0; |
1265 | octx = ictx = 0; |
1210 | retry_cnt = 0; |
1266 | retry_cnt = 0; |
1211 | |
1267 | |
|
|
1268 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1269 | conf->protocols = PROT_UDPv4; |
|
|
1270 | |
1212 | connectmode = conf_node::C_ALWAYS; // initial setting |
1271 | connectmode = conf_node::C_ALWAYS; // initial setting |
1213 | reset_connection (); |
1272 | reset_connection (); |
1214 | } |
1273 | } |
1215 | |
1274 | |
1216 | connection::~connection () |
1275 | connection::~connection () |