1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de> |
4 | |
4 | |
5 | This file is part of GVPE. |
5 | This file is part of GVPE. |
6 | |
6 | |
7 | GVPE is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify it |
8 | it under the terms of the GNU General Public License as published by |
8 | under the terms of the GNU General Public License as published by the |
9 | the Free Software Foundation; either version 2 of the License, or |
9 | Free Software Foundation; either version 3 of the License, or (at your |
10 | (at your option) any later version. |
10 | option) any later version. |
11 | |
11 | |
12 | 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, but |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General |
15 | GNU General Public License for more details. |
15 | Public License for more details. |
16 | |
16 | |
17 | 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 along |
18 | along with gvpe; if not, write to the Free Software |
18 | with this program; if not, see <http://www.gnu.org/licenses/>. |
19 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | |
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20 | Additional permission under GNU GPL version 3 section 7 |
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21 | |
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22 | If you modify this Program, or any covered work, by linking or |
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23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
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24 | version of that library), containing parts covered by the terms of the |
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25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
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26 | additional permission to convey the resulting work. Corresponding |
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27 | Source for a non-source form of such a combination shall include the |
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28 | source code for the parts of OpenSSL used as well as that of the |
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29 | covered work. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
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24 | #include <cassert> |
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25 | |
33 | |
26 | #include <list> |
34 | #include <list> |
27 | |
35 | |
28 | #include <openssl/rand.h> |
36 | #include <openssl/rand.h> |
29 | #include <openssl/evp.h> |
37 | #include <openssl/evp.h> |
30 | #include <openssl/rsa.h> |
38 | #include <openssl/rsa.h> |
31 | #include <openssl/err.h> |
39 | #include <openssl/err.h> |
32 | |
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33 | #include "gettext.h" |
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34 | |
40 | |
35 | #include "conf.h" |
41 | #include "conf.h" |
36 | #include "slog.h" |
42 | #include "slog.h" |
37 | #include "device.h" |
43 | #include "device.h" |
38 | #include "vpn.h" |
44 | #include "vpn.h" |
… | |
… | |
86 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
92 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
87 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
93 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
88 | EVP_MD_CTX_cleanup (&ctx); |
94 | EVP_MD_CTX_cleanup (&ctx); |
89 | } |
95 | } |
90 | |
96 | |
91 | struct rsa_entry { |
97 | struct rsa_entry |
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98 | { |
92 | tstamp expire; |
99 | tstamp expire; |
93 | rsaid id; |
100 | rsaid id; |
94 | rsachallenge chg; |
101 | rsachallenge chg; |
95 | }; |
102 | }; |
96 | |
103 | |
97 | struct rsa_cache : list<rsa_entry> |
104 | struct rsa_cache : list<rsa_entry> |
98 | { |
105 | { |
99 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
106 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
100 | |
107 | |
101 | bool find (const rsaid &id, rsachallenge &chg) |
108 | bool find (const rsaid &id, rsachallenge &chg) |
102 | { |
109 | { |
103 | for (iterator i = begin (); i != end (); ++i) |
110 | for (iterator i = begin (); i != end (); ++i) |
104 | { |
111 | { |
105 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
112 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
106 | { |
113 | { |
107 | memcpy (&chg, &i->chg, sizeof chg); |
114 | memcpy (&chg, &i->chg, sizeof chg); |
108 | |
115 | |
109 | erase (i); |
116 | erase (i); |
110 | return true; |
117 | return true; |
111 | } |
118 | } |
112 | } |
119 | } |
113 | |
120 | |
114 | if (cleaner.at < NOW) |
121 | if (!cleaner.is_active ()) |
115 | cleaner.start (NOW + RSA_TTL); |
122 | cleaner.again (); |
116 | |
123 | |
117 | return false; |
124 | return false; |
118 | } |
125 | } |
119 | |
126 | |
120 | void gen (rsaid &id, rsachallenge &chg) |
127 | void gen (rsaid &id, rsachallenge &chg) |
121 | { |
128 | { |
122 | rsa_entry e; |
129 | rsa_entry e; |
123 | |
130 | |
124 | RAND_bytes ((unsigned char *)&id, sizeof id); |
131 | RAND_bytes ((unsigned char *)&id, sizeof id); |
125 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
132 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
126 | |
133 | |
127 | e.expire = NOW + RSA_TTL; |
134 | e.expire = ev_now () + RSA_TTL; |
128 | e.id = id; |
135 | e.id = id; |
129 | memcpy (&e.chg, &chg, sizeof chg); |
136 | memcpy (&e.chg, &chg, sizeof chg); |
130 | |
137 | |
131 | push_back (e); |
138 | push_back (e); |
132 | |
139 | |
133 | if (cleaner.at < NOW) |
140 | if (!cleaner.is_active ()) |
134 | cleaner.start (NOW + RSA_TTL); |
141 | cleaner.again (); |
135 | } |
142 | } |
136 | |
143 | |
137 | rsa_cache () |
144 | rsa_cache () |
138 | : cleaner (this, &rsa_cache::cleaner_cb) |
145 | { |
139 | { } |
146 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
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147 | cleaner.set (RSA_TTL, RSA_TTL); |
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148 | } |
140 | |
149 | |
141 | } rsa_cache; |
150 | } rsa_cache; |
142 | |
151 | |
143 | void rsa_cache::cleaner_cb (time_watcher &w) |
152 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
144 | { |
153 | { |
145 | if (!empty ()) |
154 | if (empty ()) |
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155 | w.stop (); |
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156 | else |
146 | { |
157 | { |
147 | w.start (NOW + RSA_TTL); |
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148 | |
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149 | for (iterator i = begin (); i != end (); ) |
158 | for (iterator i = begin (); i != end (); ) |
150 | if (i->expire <= NOW) |
159 | if (i->expire <= ev_now ()) |
151 | i = erase (i); |
160 | i = erase (i); |
152 | else |
161 | else |
153 | ++i; |
162 | ++i; |
154 | } |
163 | } |
155 | } |
164 | } |
156 | |
165 | |
157 | ////////////////////////////////////////////////////////////////////////////// |
166 | ////////////////////////////////////////////////////////////////////////////// |
158 | |
167 | |
159 | void pkt_queue::put (net_packet *p) |
168 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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169 | : max_ttl (max_ttl), max_queue (max_queue) |
160 | { |
170 | { |
161 | if (queue[i]) |
171 | queue = new pkt [max_queue]; |
162 | { |
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163 | delete queue[i]; |
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164 | j = (j + 1) % QUEUEDEPTH; |
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165 | } |
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166 | |
172 | |
167 | queue[i] = p; |
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168 | |
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169 | i = (i + 1) % QUEUEDEPTH; |
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170 | } |
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171 | |
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172 | net_packet *pkt_queue::get () |
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173 | { |
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174 | net_packet *p = queue[j]; |
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175 | |
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176 | if (p) |
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177 | { |
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178 | queue[j] = 0; |
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179 | j = (j + 1) % QUEUEDEPTH; |
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180 | } |
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181 | |
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182 | return p; |
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183 | } |
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184 | |
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185 | pkt_queue::pkt_queue () |
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186 | { |
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187 | memset (queue, 0, sizeof (queue)); |
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188 | i = 0; |
173 | i = 0; |
189 | j = 0; |
174 | j = 0; |
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175 | |
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176 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
190 | } |
177 | } |
191 | |
178 | |
192 | pkt_queue::~pkt_queue () |
179 | pkt_queue::~pkt_queue () |
193 | { |
180 | { |
194 | for (i = QUEUEDEPTH; --i > 0; ) |
181 | while (net_packet *p = get ()) |
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182 | delete p; |
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183 | |
195 | delete queue[i]; |
184 | delete [] queue; |
196 | } |
185 | } |
197 | |
186 | |
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187 | void pkt_queue::expire_cb (ev::timer &w, int revents) |
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188 | { |
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189 | ev_tstamp expire = ev_now () - max_ttl; |
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190 | |
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191 | for (;;) |
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192 | { |
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193 | if (empty ()) |
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194 | break; |
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195 | |
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196 | double diff = queue[j].tstamp - expire; |
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197 | |
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198 | if (diff >= 0.) |
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199 | { |
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200 | w.start (diff > 0.5 ? diff : 0.5); |
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201 | break; |
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202 | } |
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203 | |
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204 | delete get (); |
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205 | } |
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206 | } |
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207 | |
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208 | void pkt_queue::put (net_packet *p) |
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209 | { |
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210 | ev_tstamp now = ev_now (); |
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211 | |
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212 | // start expiry timer |
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213 | if (empty ()) |
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214 | expire.start (max_ttl); |
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215 | |
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216 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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217 | |
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218 | if (ni == j) |
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219 | delete get (); |
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220 | |
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221 | queue[i].pkt = p; |
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222 | queue[i].tstamp = now; |
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223 | |
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224 | i = ni; |
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225 | } |
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226 | |
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227 | net_packet *pkt_queue::get () |
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228 | { |
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229 | if (empty ()) |
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230 | return 0; |
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231 | |
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232 | net_packet *p = queue[j].pkt; |
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233 | queue[j].pkt = 0; |
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234 | |
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235 | j = j + 1 == max_queue ? 0 : j + 1; |
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236 | |
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237 | return p; |
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238 | } |
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239 | |
198 | struct net_rateinfo { |
240 | struct net_rateinfo |
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241 | { |
199 | u32 host; |
242 | u32 host; |
200 | double pcnt, diff; |
243 | double pcnt, diff; |
201 | tstamp last; |
244 | tstamp last; |
202 | }; |
245 | }; |
203 | |
246 | |
… | |
… | |
222 | iterator i; |
265 | iterator i; |
223 | |
266 | |
224 | for (i = begin (); i != end (); ) |
267 | for (i = begin (); i != end (); ) |
225 | if (i->host == host) |
268 | if (i->host == host) |
226 | break; |
269 | break; |
227 | else if (i->last < NOW - NRL_EXPIRE) |
270 | else if (i->last < ev_now () - NRL_EXPIRE) |
228 | i = erase (i); |
271 | i = erase (i); |
229 | else |
272 | else |
230 | i++; |
273 | i++; |
231 | |
274 | |
232 | if (i == end ()) |
275 | if (i == end ()) |
… | |
… | |
234 | net_rateinfo ri; |
277 | net_rateinfo ri; |
235 | |
278 | |
236 | ri.host = host; |
279 | ri.host = host; |
237 | ri.pcnt = 1.; |
280 | ri.pcnt = 1.; |
238 | ri.diff = NRL_MAXDIF; |
281 | ri.diff = NRL_MAXDIF; |
239 | ri.last = NOW; |
282 | ri.last = ev_now (); |
240 | |
283 | |
241 | push_front (ri); |
284 | push_front (ri); |
242 | |
285 | |
243 | return true; |
286 | return true; |
244 | } |
287 | } |
… | |
… | |
246 | { |
289 | { |
247 | net_rateinfo ri (*i); |
290 | net_rateinfo ri (*i); |
248 | erase (i); |
291 | erase (i); |
249 | |
292 | |
250 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
293 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
251 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
294 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
252 | |
295 | |
253 | ri.last = NOW; |
296 | ri.last = ev_now (); |
254 | |
297 | |
255 | double dif = ri.diff / ri.pcnt; |
298 | double dif = ri.diff / ri.pcnt; |
256 | |
299 | |
257 | bool send = dif > NRL_CUTOFF; |
300 | bool send = dif > NRL_CUTOFF; |
258 | |
301 | |
… | |
… | |
468 | f |= FEATURE_COMPRESSION; |
511 | f |= FEATURE_COMPRESSION; |
469 | #endif |
512 | #endif |
470 | #if ENABLE_ROHC |
513 | #if ENABLE_ROHC |
471 | f |= FEATURE_ROHC; |
514 | f |= FEATURE_ROHC; |
472 | #endif |
515 | #endif |
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516 | #if ENABLE_BRIDGING |
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517 | f |= FEATURE_BRIDGING; |
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518 | #endif |
473 | return f; |
519 | return f; |
474 | } |
520 | } |
475 | }; |
521 | }; |
476 | |
522 | |
477 | void config_packet::setup (ptype type, int dst) |
523 | void config_packet::setup (ptype type, int dst) |
478 | { |
524 | { |
479 | prot_major = PROTOCOL_MAJOR; |
525 | prot_major = PROTOCOL_MAJOR; |
480 | prot_minor = PROTOCOL_MINOR; |
526 | prot_minor = PROTOCOL_MINOR; |
481 | randsize = RAND_SIZE; |
527 | randsize = RAND_SIZE; |
482 | hmaclen = HMACLENGTH; |
528 | hmaclen = HMACLENGTH; |
483 | flags = ENABLE_COMPRESSION ? 0x81 : 0x80; |
529 | flags = 0; |
484 | challengelen = sizeof (rsachallenge); |
530 | challengelen = sizeof (rsachallenge); |
485 | features = get_features (); |
531 | features = get_features (); |
486 | |
532 | |
487 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
533 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
488 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
534 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
… | |
… | |
498 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
544 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
499 | else if (randsize != RAND_SIZE) |
545 | else if (randsize != RAND_SIZE) |
500 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
546 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
501 | else if (hmaclen != HMACLENGTH) |
547 | else if (hmaclen != HMACLENGTH) |
502 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
548 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
503 | #if 0 // this implementation should handle all flag settings |
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504 | else if (flags != curflags ()) |
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505 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
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506 | #endif |
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507 | else if (challengelen != sizeof (rsachallenge)) |
549 | else if (challengelen != sizeof (rsachallenge)) |
508 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
550 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
509 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
551 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
510 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
552 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
511 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
553 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
… | |
… | |
587 | ///////////////////////////////////////////////////////////////////////////// |
629 | ///////////////////////////////////////////////////////////////////////////// |
588 | |
630 | |
589 | void |
631 | void |
590 | connection::connection_established () |
632 | connection::connection_established () |
591 | { |
633 | { |
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634 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
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635 | |
592 | if (ictx && octx) |
636 | if (ictx && octx) |
593 | { |
637 | { |
594 | connectmode = conf->connectmode; |
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595 | |
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596 | // make sure rekeying timeouts are slightly asymmetric |
638 | // make sure rekeying timeouts are slightly asymmetric |
597 | rekey.start (NOW + ::conf.rekey |
639 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
598 | + (conf->id > THISNODE->id ? 10 : 0)); |
640 | rekey.start (rekey_interval, rekey_interval); |
599 | keepalive.start (NOW + ::conf.keepalive); |
641 | keepalive.start (::conf.keepalive); |
600 | |
642 | |
601 | // send queued packets |
643 | // send queued packets |
602 | if (ictx && octx) |
644 | if (ictx && octx) |
603 | { |
645 | { |
604 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
646 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
605 | { |
647 | { |
606 | send_data_packet (p); |
648 | if (p->len) send_data_packet (p); |
607 | delete p; |
649 | delete p; |
608 | } |
650 | } |
609 | |
651 | |
610 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
652 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
611 | { |
653 | { |
612 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
654 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
613 | delete p; |
655 | delete p; |
614 | } |
656 | } |
615 | } |
657 | } |
616 | } |
658 | } |
617 | else |
659 | else |
618 | { |
660 | { |
619 | retry_cnt = 0; |
661 | retry_cnt = 0; |
620 | establish_connection.start (NOW + 5); |
662 | establish_connection.start (5); |
621 | keepalive.stop (); |
663 | keepalive.stop (); |
622 | rekey.stop (); |
664 | rekey.stop (); |
623 | } |
665 | } |
624 | } |
666 | } |
625 | |
667 | |
… | |
… | |
630 | |
672 | |
631 | // mask out protocols we cannot establish |
673 | // mask out protocols we cannot establish |
632 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
674 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
633 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
675 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
634 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
676 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
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677 | |
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678 | if (protocol |
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679 | && (!conf->can_direct (THISNODE) |
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680 | || !THISNODE->can_direct (conf))) |
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681 | { |
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682 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
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683 | protocol = 0; |
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684 | } |
635 | |
685 | |
636 | si.set (conf, protocol); |
686 | si.set (conf, protocol); |
637 | } |
687 | } |
638 | |
688 | |
639 | // ensure sockinfo is valid, forward if necessary |
689 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
725 | } |
775 | } |
726 | |
776 | |
727 | void |
777 | void |
728 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
778 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
729 | { |
779 | { |
730 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
780 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
731 | conf->id, rid, (const char *)rsi); |
781 | conf->id, rid, (const char *)rsi); |
732 | |
782 | |
733 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
783 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
734 | |
784 | |
735 | r->hmac_set (octx); |
785 | r->hmac_set (octx); |
736 | send_vpn_packet (r, si); |
786 | send_vpn_packet (r, si); |
737 | |
787 | |
738 | delete r; |
788 | delete r; |
739 | } |
789 | } |
740 | |
790 | |
741 | void |
791 | inline void |
742 | connection::establish_connection_cb (time_watcher &w) |
792 | connection::establish_connection_cb (ev::timer &w, int revents) |
743 | { |
793 | { |
744 | if (!ictx |
794 | if (!ictx |
745 | && conf != THISNODE |
795 | && conf != THISNODE |
746 | && connectmode != conf_node::C_NEVER |
796 | && connectmode != conf_node::C_NEVER |
747 | && connectmode != conf_node::C_DISABLED |
797 | && connectmode != conf_node::C_DISABLED |
748 | && NOW > w.at) |
798 | && !w.is_active ()) |
749 | { |
799 | { |
750 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
800 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
751 | |
801 | // and stop trying. should probably be handled by a per-connection expire handler. |
752 | if (retry_int < conf->max_retry) |
802 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
803 | { |
|
|
804 | reset_connection (); |
753 | retry_cnt++; |
805 | return; |
754 | else |
806 | } |
755 | retry_int = conf->max_retry; |
|
|
756 | |
807 | |
757 | w.start (NOW + retry_int); |
808 | last_establish_attempt = ev_now (); |
|
|
809 | |
|
|
810 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
|
|
811 | ? (retry_cnt & 3) + 1 |
|
|
812 | : 1 << (retry_cnt >> 2)); |
758 | |
813 | |
759 | reset_si (); |
814 | reset_si (); |
760 | |
815 | |
|
|
816 | bool slow = si.prot & PROT_SLOW; |
|
|
817 | |
761 | if (si.prot && !si.host) |
818 | if (si.prot && !si.host) |
|
|
819 | { |
|
|
820 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
821 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
822 | w.start (1); |
762 | vpn->send_connect_request (conf->id); |
823 | vpn->send_connect_request (conf->id); |
|
|
824 | } |
763 | else |
825 | else |
764 | { |
826 | { |
|
|
827 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
|
|
828 | |
765 | const sockinfo &dsi = forward_si (si); |
829 | const sockinfo &dsi = forward_si (si); |
|
|
830 | |
|
|
831 | slow = slow || (dsi.prot & PROT_SLOW); |
766 | |
832 | |
767 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
833 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
768 | { |
834 | { |
769 | if (retry_cnt < 4) |
835 | if (retry_cnt < 4) |
770 | send_auth_request (dsi, true); |
836 | send_auth_request (dsi, true); |
771 | else |
837 | else |
772 | send_ping (dsi, 0); |
838 | send_ping (dsi, 0); |
773 | } |
839 | } |
774 | } |
840 | } |
|
|
841 | |
|
|
842 | retry_int *= slow ? 8. : 0.9; |
|
|
843 | |
|
|
844 | if (retry_int < conf->max_retry) |
|
|
845 | retry_cnt++; |
|
|
846 | else |
|
|
847 | retry_int = conf->max_retry; |
|
|
848 | |
|
|
849 | w.start (retry_int); |
775 | } |
850 | } |
776 | } |
851 | } |
777 | |
852 | |
778 | void |
853 | void |
779 | connection::reset_connection () |
854 | connection::reset_connection () |
… | |
… | |
782 | { |
857 | { |
783 | slog (L_INFO, _("%s(%s): connection lost"), |
858 | slog (L_INFO, _("%s(%s): connection lost"), |
784 | conf->nodename, (const char *)si); |
859 | conf->nodename, (const char *)si); |
785 | |
860 | |
786 | if (::conf.script_node_down) |
861 | if (::conf.script_node_down) |
787 | run_script (run_script_cb (this, &connection::script_node_down), false); |
862 | { |
|
|
863 | run_script_cb cb; |
|
|
864 | cb.set<connection, &connection::script_node_down> (this); |
|
|
865 | if (!run_script (cb, false)) |
|
|
866 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
|
|
867 | } |
788 | } |
868 | } |
789 | |
869 | |
790 | delete ictx; ictx = 0; |
870 | delete ictx; ictx = 0; |
791 | delete octx; octx = 0; |
871 | delete octx; octx = 0; |
792 | #if ENABLE_DNS |
872 | #if ENABLE_DNS |
… | |
… | |
810 | send_reset (si); |
890 | send_reset (si); |
811 | |
891 | |
812 | reset_connection (); |
892 | reset_connection (); |
813 | } |
893 | } |
814 | |
894 | |
815 | void |
895 | inline void |
816 | connection::rekey_cb (time_watcher &w) |
896 | connection::rekey_cb (ev::timer &w, int revents) |
817 | { |
897 | { |
818 | reset_connection (); |
898 | reset_connection (); |
819 | establish_connection (); |
899 | establish_connection (); |
820 | } |
900 | } |
821 | |
901 | |
… | |
… | |
837 | if (oseqno > MAX_SEQNO) |
917 | if (oseqno > MAX_SEQNO) |
838 | rekey (); |
918 | rekey (); |
839 | } |
919 | } |
840 | |
920 | |
841 | void |
921 | void |
|
|
922 | connection::post_inject_queue () |
|
|
923 | { |
|
|
924 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
925 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
926 | establish_connection.stop (); |
|
|
927 | |
|
|
928 | establish_connection (); |
|
|
929 | } |
|
|
930 | |
|
|
931 | void |
842 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
932 | connection::inject_data_packet (tap_packet *pkt) |
843 | { |
933 | { |
844 | if (ictx && octx) |
934 | if (ictx && octx) |
845 | send_data_packet (pkt); |
935 | send_data_packet (pkt); |
846 | else |
936 | else |
847 | { |
937 | { |
848 | if (!broadcast)//DDDD |
|
|
849 | data_queue.put (new tap_packet (*pkt)); |
938 | data_queue.put (new tap_packet (*pkt)); |
850 | |
939 | post_inject_queue (); |
851 | establish_connection (); |
|
|
852 | } |
940 | } |
853 | } |
941 | } |
854 | |
942 | |
855 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
943 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
856 | { |
944 | { |
857 | if (ictx && octx) |
945 | if (ictx && octx) |
858 | send_vpn_packet (pkt, si, tos); |
946 | send_vpn_packet (pkt, si, tos); |
859 | else |
947 | else |
860 | { |
948 | { |
861 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
949 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
862 | |
950 | post_inject_queue (); |
863 | establish_connection (); |
|
|
864 | } |
951 | } |
865 | } |
952 | } |
866 | |
953 | |
867 | void |
954 | void |
868 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
955 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
869 | { |
956 | { |
870 | last_activity = NOW; |
957 | last_activity = ev_now (); |
871 | |
958 | |
872 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
959 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
873 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
960 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
961 | |
|
|
962 | if (connectmode == conf_node::C_DISABLED) |
|
|
963 | return; |
874 | |
964 | |
875 | switch (pkt->typ ()) |
965 | switch (pkt->typ ()) |
876 | { |
966 | { |
877 | case vpn_packet::PT_PING: |
967 | case vpn_packet::PT_PING: |
878 | // we send pings instead of auth packets after some retries, |
968 | // we send pings instead of auth packets after some retries, |
… | |
… | |
938 | delete octx; |
1028 | delete octx; |
939 | |
1029 | |
940 | octx = new crypto_ctx (k, 1); |
1030 | octx = new crypto_ctx (k, 1); |
941 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1031 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
942 | |
1032 | |
943 | // compatibility code, remove when no longer required |
|
|
944 | if (p->flags & 1) p->features |= FEATURE_COMPRESSION; |
|
|
945 | |
|
|
946 | conf->protocols = p->protocols; |
1033 | conf->protocols = p->protocols; |
947 | features = p->features & config_packet::get_features (); |
1034 | features = p->features & config_packet::get_features (); |
948 | |
1035 | |
949 | send_auth_response (rsi, p->id, k); |
1036 | send_auth_response (rsi, p->id, k); |
950 | |
1037 | |
… | |
… | |
1016 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1103 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1017 | conf->nodename, (const char *)rsi, |
1104 | conf->nodename, (const char *)rsi, |
1018 | p->prot_major, p->prot_minor); |
1105 | p->prot_major, p->prot_minor); |
1019 | |
1106 | |
1020 | if (::conf.script_node_up) |
1107 | if (::conf.script_node_up) |
1021 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1108 | { |
|
|
1109 | run_script_cb cb; |
|
|
1110 | cb.set<connection, &connection::script_node_up> (this); |
|
|
1111 | if (!run_script (cb, false)) |
|
|
1112 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
|
|
1113 | } |
1022 | |
1114 | |
1023 | break; |
1115 | break; |
1024 | } |
1116 | } |
1025 | else |
1117 | else |
1026 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1118 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
1060 | { |
1152 | { |
1061 | vpn->tap->send (d); |
1153 | vpn->tap->send (d); |
1062 | |
1154 | |
1063 | if (si != rsi) |
1155 | if (si != rsi) |
1064 | { |
1156 | { |
1065 | // fast re-sync on connection changes, useful especially for tcp/ip |
1157 | // fast re-sync on source address changes, useful especially for tcp/ip |
1066 | si = rsi; |
1158 | si = rsi; |
1067 | |
1159 | |
1068 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1160 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1069 | conf->nodename, (const char *)si, (const char *)rsi); |
1161 | conf->nodename, (const char *)si, (const char *)rsi); |
1070 | } |
1162 | } |
… | |
… | |
1081 | case vpn_packet::PT_CONNECT_REQ: |
1173 | case vpn_packet::PT_CONNECT_REQ: |
1082 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1174 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1083 | { |
1175 | { |
1084 | connect_req_packet *p = (connect_req_packet *) pkt; |
1176 | connect_req_packet *p = (connect_req_packet *) pkt; |
1085 | |
1177 | |
1086 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1178 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1087 | connection *c = vpn->conns[p->id - 1]; |
|
|
1088 | conf->protocols = p->protocols; |
|
|
1089 | |
|
|
1090 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1091 | conf->id, p->id, c->ictx && c->octx); |
|
|
1092 | |
|
|
1093 | if (c->ictx && c->octx) |
|
|
1094 | { |
1179 | { |
|
|
1180 | connection *c = vpn->conns[p->id - 1]; |
|
|
1181 | conf->protocols = p->protocols; |
|
|
1182 | |
|
|
1183 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
|
|
1184 | conf->id, p->id, c->ictx && c->octx); |
|
|
1185 | |
|
|
1186 | if (c->ictx && c->octx) |
|
|
1187 | { |
1095 | // send connect_info packets to both sides, in case one is |
1188 | // send connect_info packets to both sides, in case one is |
1096 | // behind a nat firewall (or both ;) |
1189 | // behind a nat firewall (or both ;) |
1097 | c->send_connect_info (conf->id, si, conf->protocols); |
1190 | c->send_connect_info (conf->id, si, conf->protocols); |
1098 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1191 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1192 | } |
|
|
1193 | else |
|
|
1194 | c->establish_connection (); |
1099 | } |
1195 | } |
1100 | else |
1196 | else |
1101 | c->establish_connection (); |
1197 | slog (L_WARN, |
|
|
1198 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1199 | p->id); |
1102 | } |
1200 | } |
1103 | |
1201 | |
1104 | break; |
1202 | break; |
1105 | |
1203 | |
1106 | case vpn_packet::PT_CONNECT_INFO: |
1204 | case vpn_packet::PT_CONNECT_INFO: |
1107 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1205 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1108 | { |
1206 | { |
1109 | connect_info_packet *p = (connect_info_packet *)pkt; |
1207 | connect_info_packet *p = (connect_info_packet *)pkt; |
1110 | |
1208 | |
1111 | if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything |
1209 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1112 | { |
1210 | { |
1113 | connection *c = vpn->conns[p->id - 1]; |
1211 | connection *c = vpn->conns[p->id - 1]; |
1114 | |
1212 | |
1115 | c->conf->protocols = p->protocols; |
1213 | c->conf->protocols = p->protocols; |
1116 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1214 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
… | |
… | |
1122 | const sockinfo &dsi = forward_si (p->si); |
1220 | const sockinfo &dsi = forward_si (p->si); |
1123 | |
1221 | |
1124 | if (dsi.valid ()) |
1222 | if (dsi.valid ()) |
1125 | c->send_auth_request (dsi, true); |
1223 | c->send_auth_request (dsi, true); |
1126 | } |
1224 | } |
|
|
1225 | else |
|
|
1226 | slog (L_WARN, |
|
|
1227 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1228 | p->id); |
1127 | } |
1229 | } |
1128 | |
1230 | |
1129 | break; |
1231 | break; |
1130 | |
1232 | |
1131 | default: |
1233 | default: |
1132 | send_reset (rsi); |
1234 | send_reset (rsi); |
1133 | break; |
1235 | break; |
1134 | } |
1236 | } |
1135 | } |
1237 | } |
1136 | |
1238 | |
1137 | void connection::keepalive_cb (time_watcher &w) |
1239 | inline void |
|
|
1240 | connection::keepalive_cb (ev::timer &w, int revents) |
1138 | { |
1241 | { |
1139 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1242 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1140 | { |
1243 | { |
1141 | reset_connection (); |
1244 | reset_connection (); |
1142 | establish_connection (); |
1245 | establish_connection (); |
1143 | } |
1246 | } |
1144 | else if (NOW < last_activity + ::conf.keepalive) |
1247 | else if (ev_now () < last_activity + ::conf.keepalive) |
1145 | w.start (last_activity + ::conf.keepalive); |
1248 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1146 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1249 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1147 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1250 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1148 | { |
1251 | { |
1149 | send_ping (si); |
1252 | send_ping (si); |
1150 | w.start (NOW + 5); |
1253 | w.start (5); |
1151 | } |
1254 | } |
1152 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1255 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1153 | // hold ondemand connections implicitly a few seconds longer |
1256 | // hold ondemand connections implicitly a few seconds longer |
1154 | // should delete octx, though, or something like that ;) |
1257 | // should delete octx, though, or something like that ;) |
1155 | w.start (last_activity + ::conf.keepalive + 10); |
1258 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1156 | else |
1259 | else |
1157 | reset_connection (); |
1260 | reset_connection (); |
1158 | } |
1261 | } |
1159 | |
1262 | |
1160 | void connection::send_connect_request (int id) |
1263 | void connection::send_connect_request (int id) |
… | |
… | |
1166 | send_vpn_packet (p, si); |
1269 | send_vpn_packet (p, si); |
1167 | |
1270 | |
1168 | delete p; |
1271 | delete p; |
1169 | } |
1272 | } |
1170 | |
1273 | |
|
|
1274 | void connection::script_init_env (const char *ext) |
|
|
1275 | { |
|
|
1276 | char *env; |
|
|
1277 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1278 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1279 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1280 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1281 | conf->id & 0xff); putenv (env); |
|
|
1282 | } |
|
|
1283 | |
1171 | void connection::script_node () |
1284 | void connection::script_init_connect_env () |
1172 | { |
1285 | { |
1173 | vpn->script_if_up (); |
1286 | vpn->script_init_env (); |
1174 | |
1287 | |
1175 | char *env; |
1288 | char *env; |
1176 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1289 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1177 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1290 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1178 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1291 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1179 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1292 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1180 | } |
1293 | } |
1181 | |
1294 | |
|
|
1295 | inline const char * |
1182 | const char *connection::script_node_up () |
1296 | connection::script_node_up () |
1183 | { |
1297 | { |
1184 | script_node (); |
1298 | script_init_connect_env (); |
1185 | |
1299 | |
1186 | putenv ("STATE=up"); |
1300 | putenv ((char *)"STATE=up"); |
1187 | |
1301 | |
|
|
1302 | char *filename; |
|
|
1303 | asprintf (&filename, |
|
|
1304 | "%s/%s", |
|
|
1305 | confbase, |
1188 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1306 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1189 | } |
|
|
1190 | |
1307 | |
|
|
1308 | return filename; |
|
|
1309 | } |
|
|
1310 | |
|
|
1311 | inline const char * |
1191 | const char *connection::script_node_down () |
1312 | connection::script_node_down () |
1192 | { |
1313 | { |
1193 | script_node (); |
1314 | script_init_connect_env (); |
1194 | |
1315 | |
1195 | putenv ("STATE=down"); |
1316 | putenv ((char *)"STATE=down"); |
1196 | |
1317 | |
1197 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1318 | char *filename; |
|
|
1319 | asprintf (&filename, |
|
|
1320 | "%s/%s", |
|
|
1321 | confbase, |
|
|
1322 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
|
|
1323 | |
|
|
1324 | return filename; |
1198 | } |
1325 | } |
1199 | |
1326 | |
1200 | connection::connection (struct vpn *vpn, conf_node *conf) |
1327 | connection::connection (struct vpn *vpn, conf_node *conf) |
1201 | : vpn(vpn), conf(conf) |
1328 | : vpn(vpn), conf(conf), |
1202 | , rekey (this, &connection::rekey_cb) |
|
|
1203 | , keepalive (this, &connection::keepalive_cb) |
|
|
1204 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1205 | #if ENABLE_DNS |
1329 | #if ENABLE_DNS |
1206 | , dns (0) |
1330 | dns (0), |
1207 | #endif |
1331 | #endif |
|
|
1332 | data_queue(conf->max_ttl, conf->max_queue), |
|
|
1333 | vpn_queue(conf->max_ttl, conf->max_queue) |
1208 | { |
1334 | { |
|
|
1335 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1336 | keepalive .set<connection, &connection::keepalive_cb > (this); |
|
|
1337 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
|
|
1338 | |
|
|
1339 | last_establish_attempt = 0.; |
1209 | octx = ictx = 0; |
1340 | octx = ictx = 0; |
1210 | retry_cnt = 0; |
|
|
1211 | |
1341 | |
1212 | if (!conf->protocols) // make sure some protocol is enabled |
1342 | if (!conf->protocols) // make sure some protocol is enabled |
1213 | conf->protocols = PROT_UDPv4; |
1343 | conf->protocols = PROT_UDPv4; |
1214 | |
1344 | |
1215 | connectmode = conf_node::C_ALWAYS; // initial setting |
1345 | connectmode = conf->connectmode; |
|
|
1346 | |
|
|
1347 | // queue a dummy packet to force an initial connection attempt |
|
|
1348 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1349 | vpn_queue.put (new net_packet); |
|
|
1350 | |
1216 | reset_connection (); |
1351 | reset_connection (); |
1217 | } |
1352 | } |
1218 | |
1353 | |
1219 | connection::~connection () |
1354 | connection::~connection () |
1220 | { |
1355 | { |