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) 2003-2008,2010,2011 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. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 | |
33 | |
24 | #include <list> |
34 | #include <list> |
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35 | #include <queue> |
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36 | #include <utility> |
25 | |
37 | |
26 | #include <openssl/rand.h> |
38 | #include <openssl/rand.h> |
27 | #include <openssl/evp.h> |
39 | #include <openssl/evp.h> |
28 | #include <openssl/rsa.h> |
40 | #include <openssl/rsa.h> |
29 | #include <openssl/err.h> |
41 | #include <openssl/err.h> |
… | |
… | |
38 | |
50 | |
39 | #if !HAVE_RAND_PSEUDO_BYTES |
51 | #if !HAVE_RAND_PSEUDO_BYTES |
40 | # define RAND_pseudo_bytes RAND_bytes |
52 | # define RAND_pseudo_bytes RAND_bytes |
41 | #endif |
53 | #endif |
42 | |
54 | |
43 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
55 | #define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol) |
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56 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated) |
44 | |
57 | |
45 | #define ULTRA_FAST 1 |
58 | #define ULTRA_FAST 1 |
46 | #define HLOG 15 |
59 | #define HLOG 15 |
47 | #include "lzf/lzf.h" |
60 | #include "lzf/lzf.h" |
48 | #include "lzf/lzf_c.c" |
61 | #include "lzf/lzf_c.c" |
49 | #include "lzf/lzf_d.c" |
62 | #include "lzf/lzf_d.c" |
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63 | |
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64 | ////////////////////////////////////////////////////////////////////////////// |
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65 | |
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66 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
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67 | static ev::child rs_child_ev; |
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68 | |
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69 | namespace |
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70 | { |
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71 | void // c++ requires external linkage here, apparently :( |
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72 | rs_child_cb (ev::child &w, int revents) |
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73 | { |
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74 | w.stop (); |
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75 | |
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76 | if (rs_queue.empty ()) |
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77 | return; |
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78 | |
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79 | pid_t pid = run_script (*rs_queue.front ().first, false); |
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80 | if (pid) |
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81 | { |
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82 | w.set (pid); |
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83 | w.start (); |
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84 | } |
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85 | else |
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86 | slog (L_WARN, rs_queue.front ().second); |
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87 | |
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88 | delete rs_queue.front ().first; |
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89 | rs_queue.pop (); |
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90 | } |
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91 | }; |
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92 | |
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93 | // despite the fancy name, this is quite a hack |
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94 | static void |
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95 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
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96 | { |
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97 | rs_queue.push (std::make_pair (cb, warnmsg)); |
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98 | |
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99 | if (!rs_child_ev.is_active ()) |
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100 | { |
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101 | rs_child_ev.set<rs_child_cb> (); |
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102 | rs_child_ev (); |
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103 | } |
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104 | } |
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105 | |
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106 | ////////////////////////////////////////////////////////////////////////////// |
50 | |
107 | |
51 | struct crypto_ctx |
108 | struct crypto_ctx |
52 | { |
109 | { |
53 | EVP_CIPHER_CTX cctx; |
110 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
111 | HMAC_CTX hctx; |
… | |
… | |
91 | rsachallenge chg; |
148 | rsachallenge chg; |
92 | }; |
149 | }; |
93 | |
150 | |
94 | struct rsa_cache : list<rsa_entry> |
151 | struct rsa_cache : list<rsa_entry> |
95 | { |
152 | { |
96 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
153 | inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
97 | |
154 | |
98 | bool find (const rsaid &id, rsachallenge &chg) |
155 | bool find (const rsaid &id, rsachallenge &chg) |
99 | { |
156 | { |
100 | for (iterator i = begin (); i != end (); ++i) |
157 | for (iterator i = begin (); i != end (); ++i) |
101 | { |
158 | { |
… | |
… | |
130 | if (!cleaner.is_active ()) |
187 | if (!cleaner.is_active ()) |
131 | cleaner.again (); |
188 | cleaner.again (); |
132 | } |
189 | } |
133 | |
190 | |
134 | rsa_cache () |
191 | rsa_cache () |
135 | : cleaner (this, &rsa_cache::cleaner_cb) |
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136 | { |
192 | { |
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193 | cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this); |
137 | cleaner.set (RSA_TTL, RSA_TTL); |
194 | cleaner.set (RSA_TTL, RSA_TTL); |
138 | } |
195 | } |
139 | |
196 | |
140 | } rsa_cache; |
197 | } rsa_cache; |
141 | |
198 | |
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199 | void |
142 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
200 | rsa_cache::cleaner_cb (ev::timer &w, int revents) |
143 | { |
201 | { |
144 | if (empty ()) |
202 | if (empty ()) |
145 | w.stop (); |
203 | w.stop (); |
146 | else |
204 | else |
147 | { |
205 | { |
… | |
… | |
153 | } |
211 | } |
154 | } |
212 | } |
155 | |
213 | |
156 | ////////////////////////////////////////////////////////////////////////////// |
214 | ////////////////////////////////////////////////////////////////////////////// |
157 | |
215 | |
158 | void pkt_queue::put (net_packet *p) |
216 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
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217 | : max_ttl (max_ttl), max_queue (max_queue) |
159 | { |
218 | { |
160 | if (queue[i]) |
219 | queue = new pkt [max_queue]; |
161 | { |
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162 | delete queue[i]; |
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163 | j = (j + 1) % QUEUEDEPTH; |
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164 | } |
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165 | |
220 | |
166 | queue[i] = p; |
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167 | |
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168 | i = (i + 1) % QUEUEDEPTH; |
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169 | } |
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170 | |
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171 | net_packet *pkt_queue::get () |
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172 | { |
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173 | net_packet *p = queue[j]; |
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174 | |
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175 | if (p) |
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176 | { |
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177 | queue[j] = 0; |
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178 | j = (j + 1) % QUEUEDEPTH; |
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179 | } |
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180 | |
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181 | return p; |
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182 | } |
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183 | |
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184 | pkt_queue::pkt_queue () |
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185 | { |
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186 | memset (queue, 0, sizeof (queue)); |
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187 | i = 0; |
221 | i = 0; |
188 | j = 0; |
222 | j = 0; |
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223 | |
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224 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
189 | } |
225 | } |
190 | |
226 | |
191 | pkt_queue::~pkt_queue () |
227 | pkt_queue::~pkt_queue () |
192 | { |
228 | { |
193 | for (i = QUEUEDEPTH; --i > 0; ) |
229 | while (net_packet *p = get ()) |
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230 | delete p; |
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231 | |
194 | delete queue[i]; |
232 | delete [] queue; |
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233 | } |
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234 | |
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235 | void |
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236 | pkt_queue::expire_cb (ev::timer &w, int revents) |
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237 | { |
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238 | ev_tstamp expire = ev_now () - max_ttl; |
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239 | |
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240 | for (;;) |
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241 | { |
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242 | if (empty ()) |
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243 | break; |
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244 | |
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245 | double diff = queue[j].tstamp - expire; |
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246 | |
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247 | if (diff >= 0.) |
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248 | { |
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249 | w.start (diff > 0.5 ? diff : 0.5); |
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250 | break; |
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251 | } |
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252 | |
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253 | delete get (); |
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254 | } |
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255 | } |
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256 | |
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257 | void |
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258 | pkt_queue::put (net_packet *p) |
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259 | { |
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260 | ev_tstamp now = ev_now (); |
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261 | |
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262 | // start expiry timer |
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263 | if (empty ()) |
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264 | expire.start (max_ttl); |
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265 | |
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266 | int ni = i + 1 == max_queue ? 0 : i + 1; |
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267 | |
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268 | if (ni == j) |
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269 | delete get (); |
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270 | |
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271 | queue[i].pkt = p; |
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272 | queue[i].tstamp = now; |
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273 | |
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274 | i = ni; |
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275 | } |
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276 | |
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277 | net_packet * |
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278 | pkt_queue::get () |
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279 | { |
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280 | if (empty ()) |
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281 | return 0; |
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282 | |
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283 | net_packet *p = queue[j].pkt; |
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284 | queue[j].pkt = 0; |
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285 | |
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286 | j = j + 1 == max_queue ? 0 : j + 1; |
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287 | |
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288 | return p; |
195 | } |
289 | } |
196 | |
290 | |
197 | struct net_rateinfo |
291 | struct net_rateinfo |
198 | { |
292 | { |
199 | u32 host; |
293 | u32 host; |
… | |
… | |
213 | |
307 | |
214 | bool can (const sockinfo &si) { return can((u32)si.host); } |
308 | bool can (const sockinfo &si) { return can((u32)si.host); } |
215 | bool can (u32 host); |
309 | bool can (u32 host); |
216 | }; |
310 | }; |
217 | |
311 | |
218 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
312 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
219 | |
313 | |
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314 | bool |
220 | bool net_rate_limiter::can (u32 host) |
315 | net_rate_limiter::can (u32 host) |
221 | { |
316 | { |
222 | iterator i; |
317 | iterator i; |
223 | |
318 | |
224 | for (i = begin (); i != end (); ) |
319 | for (i = begin (); i != end (); ) |
225 | if (i->host == host) |
320 | if (i->host == host) |
… | |
… | |
272 | |
367 | |
273 | ///////////////////////////////////////////////////////////////////////////// |
368 | ///////////////////////////////////////////////////////////////////////////// |
274 | |
369 | |
275 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
370 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
276 | |
371 | |
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372 | void |
277 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
373 | hmac_packet::hmac_gen (crypto_ctx *ctx) |
278 | { |
374 | { |
279 | unsigned int xlen; |
375 | unsigned int xlen; |
280 | |
376 | |
281 | HMAC_CTX *hctx = &ctx->hctx; |
377 | HMAC_CTX *hctx = &ctx->hctx; |
282 | |
378 | |
… | |
… | |
300 | hmac_gen (ctx); |
396 | hmac_gen (ctx); |
301 | |
397 | |
302 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
398 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
303 | } |
399 | } |
304 | |
400 | |
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401 | void |
305 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
402 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
306 | { |
403 | { |
307 | type = type_; |
404 | type = type_; |
308 | |
405 | |
309 | int src = THISNODE->id; |
406 | int src = THISNODE->id; |
310 | |
407 | |
… | |
… | |
315 | |
412 | |
316 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
413 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
317 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
414 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
318 | |
415 | |
319 | struct vpndata_packet : vpn_packet |
416 | struct vpndata_packet : vpn_packet |
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417 | { |
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418 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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419 | |
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420 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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421 | tap_packet *unpack (connection *conn, u32 &seqno); |
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422 | |
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423 | private: |
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424 | const u32 data_hdr_size () const |
320 | { |
425 | { |
321 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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322 | |
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323 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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324 | tap_packet *unpack (connection *conn, u32 &seqno); |
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325 | private: |
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326 | |
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327 | const u32 data_hdr_size () const |
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328 | { |
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329 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
426 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
330 | } |
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331 | }; |
427 | } |
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428 | }; |
332 | |
429 | |
333 | void |
430 | void |
334 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
431 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
335 | { |
432 | { |
336 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
433 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
… | |
… | |
338 | ptype type = PT_DATA_UNCOMPRESSED; |
435 | ptype type = PT_DATA_UNCOMPRESSED; |
339 | |
436 | |
340 | #if ENABLE_COMPRESSION |
437 | #if ENABLE_COMPRESSION |
341 | u8 cdata[MAX_MTU]; |
438 | u8 cdata[MAX_MTU]; |
342 | |
439 | |
343 | if (conn->features & ENABLE_COMPRESSION) |
440 | if (conn->features & FEATURE_COMPRESSION) |
344 | { |
441 | { |
345 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
442 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
346 | |
443 | |
347 | if (cl) |
444 | if (cl) |
348 | { |
445 | { |
… | |
… | |
475 | #endif |
572 | #endif |
476 | return f; |
573 | return f; |
477 | } |
574 | } |
478 | }; |
575 | }; |
479 | |
576 | |
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577 | void |
480 | void config_packet::setup (ptype type, int dst) |
578 | config_packet::setup (ptype type, int dst) |
481 | { |
579 | { |
482 | prot_major = PROTOCOL_MAJOR; |
580 | prot_major = PROTOCOL_MAJOR; |
483 | prot_minor = PROTOCOL_MINOR; |
581 | prot_minor = PROTOCOL_MINOR; |
484 | randsize = RAND_SIZE; |
582 | randsize = RAND_SIZE; |
485 | hmaclen = HMACLENGTH; |
583 | hmaclen = HMACLENGTH; |
… | |
… | |
493 | |
591 | |
494 | len = sizeof (*this) - sizeof (net_packet); |
592 | len = sizeof (*this) - sizeof (net_packet); |
495 | set_hdr (type, dst); |
593 | set_hdr (type, dst); |
496 | } |
594 | } |
497 | |
595 | |
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596 | bool |
498 | bool config_packet::chk_config () const |
597 | config_packet::chk_config () const |
499 | { |
598 | { |
500 | if (prot_major != PROTOCOL_MAJOR) |
599 | if (prot_major != PROTOCOL_MAJOR) |
501 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
600 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
502 | else if (randsize != RAND_SIZE) |
601 | else if (randsize != RAND_SIZE) |
503 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
602 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
… | |
… | |
527 | rsaencrdata encr; |
626 | rsaencrdata encr; |
528 | |
627 | |
529 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
628 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
530 | { |
629 | { |
531 | config_packet::setup (PT_AUTH_REQ, dst); |
630 | config_packet::setup (PT_AUTH_REQ, dst); |
532 | strncpy (magic, MAGIC, 8); |
631 | strncpy (magic, MAGIC_OLD, 8); |
533 | initiate = !!initiate_; |
632 | initiate = !!initiate_; |
534 | protocols = protocols_; |
633 | protocols = protocols_; |
535 | |
634 | |
536 | len = sizeof (*this) - sizeof (net_packet); |
635 | len = sizeof (*this) - sizeof (net_packet); |
537 | } |
636 | } |
… | |
… | |
586 | ///////////////////////////////////////////////////////////////////////////// |
685 | ///////////////////////////////////////////////////////////////////////////// |
587 | |
686 | |
588 | void |
687 | void |
589 | connection::connection_established () |
688 | connection::connection_established () |
590 | { |
689 | { |
591 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
690 | slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
592 | |
691 | |
593 | if (ictx && octx) |
692 | if (ictx && octx) |
594 | { |
693 | { |
595 | connectmode = conf->connectmode; |
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596 | |
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597 | // make sure rekeying timeouts are slightly asymmetric |
694 | // make sure rekeying timeouts are slightly asymmetric |
598 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
695 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
599 | rekey.start (rekey_interval, rekey_interval); |
696 | rekey.start (rekey_interval, rekey_interval); |
600 | keepalive.start (::conf.keepalive); |
697 | keepalive.start (::conf.keepalive); |
601 | |
698 | |
602 | // send queued packets |
699 | // send queued packets |
603 | if (ictx && octx) |
700 | if (ictx && octx) |
604 | { |
701 | { |
605 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
702 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
606 | { |
703 | { |
607 | send_data_packet (p); |
704 | if (p->len) send_data_packet (p); |
608 | delete p; |
705 | delete p; |
609 | } |
706 | } |
610 | |
707 | |
611 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
708 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
612 | { |
709 | { |
613 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
710 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
614 | delete p; |
711 | delete p; |
615 | } |
712 | } |
616 | } |
713 | } |
|
|
714 | |
|
|
715 | vpn->connection_established (this); |
617 | } |
716 | } |
618 | else |
717 | else |
619 | { |
718 | { |
620 | retry_cnt = 0; |
719 | retry_cnt = 0; |
621 | establish_connection.start (5); |
720 | establish_connection.start (5); |
… | |
… | |
625 | } |
724 | } |
626 | |
725 | |
627 | void |
726 | void |
628 | connection::reset_si () |
727 | connection::reset_si () |
629 | { |
728 | { |
|
|
729 | if (vpn->can_direct (THISNODE, conf)) |
630 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
730 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
631 | |
731 | else |
632 | // mask out protocols we cannot establish |
|
|
633 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
|
|
634 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
635 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
|
|
636 | |
|
|
637 | if (protocol |
|
|
638 | && (!conf->can_direct (THISNODE) |
|
|
639 | || !THISNODE->can_direct (conf))) |
|
|
640 | { |
732 | { |
641 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
733 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
642 | protocol = 0; |
734 | protocol = 0; |
643 | } |
735 | } |
644 | |
736 | |
645 | si.set (conf, protocol); |
737 | si.set (conf, protocol); |
|
|
738 | |
|
|
739 | is_direct = si.valid (); |
646 | } |
740 | } |
647 | |
741 | |
648 | // ensure sockinfo is valid, forward if necessary |
742 | // ensure sockinfo is valid, forward if necessary |
649 | const sockinfo & |
743 | const sockinfo & |
650 | connection::forward_si (const sockinfo &si) const |
744 | connection::forward_si (const sockinfo &si) const |
651 | { |
745 | { |
652 | if (!si.valid ()) |
746 | if (!si.valid ()) |
653 | { |
747 | { |
654 | connection *r = vpn->find_router (); |
748 | connection *r = vpn->find_router_for (this); |
655 | |
749 | |
656 | if (r) |
750 | if (r) |
657 | { |
751 | { |
658 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
752 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
659 | conf->nodename, r->conf->nodename, (const char *)r->si); |
753 | conf->nodename, r->conf->nodename); |
660 | return r->si; |
754 | return r->si; |
661 | } |
755 | } |
662 | else |
756 | else |
663 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
757 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
664 | conf->nodename); |
758 | conf->nodename); |
665 | } |
759 | } |
666 | |
760 | |
667 | return si; |
761 | return si; |
668 | } |
762 | } |
… | |
… | |
678 | connection::send_ping (const sockinfo &si, u8 pong) |
772 | connection::send_ping (const sockinfo &si, u8 pong) |
679 | { |
773 | { |
680 | ping_packet *pkt = new ping_packet; |
774 | ping_packet *pkt = new ping_packet; |
681 | |
775 | |
682 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
776 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
777 | |
|
|
778 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
|
|
779 | |
683 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
780 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
684 | |
781 | |
685 | delete pkt; |
782 | delete pkt; |
686 | } |
783 | } |
687 | |
784 | |
… | |
… | |
706 | |
803 | |
707 | rsachallenge chg; |
804 | rsachallenge chg; |
708 | rsa_cache.gen (pkt->id, chg); |
805 | rsa_cache.gen (pkt->id, chg); |
709 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
806 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
710 | |
807 | |
711 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
808 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
712 | |
809 | |
713 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
810 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
714 | |
811 | |
715 | delete pkt; |
812 | delete pkt; |
716 | } |
813 | } |
… | |
… | |
724 | |
821 | |
725 | rsa_hash (id, chg, pkt->response); |
822 | rsa_hash (id, chg, pkt->response); |
726 | |
823 | |
727 | pkt->hmac_set (octx); |
824 | pkt->hmac_set (octx); |
728 | |
825 | |
729 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
826 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
730 | |
827 | |
731 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
828 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
732 | |
829 | |
733 | delete pkt; |
830 | delete pkt; |
734 | } |
831 | } |
735 | |
832 | |
736 | void |
833 | void |
737 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
834 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
738 | { |
835 | { |
739 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
836 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
740 | conf->id, rid, (const char *)rsi); |
837 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
838 | conf->protocols); |
741 | |
839 | |
742 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
840 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
743 | |
841 | |
744 | r->hmac_set (octx); |
842 | r->hmac_set (octx); |
745 | send_vpn_packet (r, si); |
843 | send_vpn_packet (r, si); |
746 | |
844 | |
747 | delete r; |
845 | delete r; |
748 | } |
846 | } |
749 | |
847 | |
750 | void |
848 | inline void |
751 | connection::establish_connection_cb (ev::timer &w, int revents) |
849 | connection::establish_connection_cb (ev::timer &w, int revents) |
752 | { |
850 | { |
753 | if (!ictx |
851 | if (!(ictx && octx) |
754 | && conf != THISNODE |
852 | && conf != THISNODE |
755 | && connectmode != conf_node::C_NEVER |
853 | && connectmode != conf_node::C_NEVER |
756 | && connectmode != conf_node::C_DISABLED |
854 | && connectmode != conf_node::C_DISABLED |
757 | && !w.is_active ()) |
855 | && !w.is_active ()) |
758 | { |
856 | { |
|
|
857 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
|
|
858 | // and stop trying. should probably be handled by a per-connection expire handler. |
|
|
859 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
860 | { |
|
|
861 | reset_connection (); |
|
|
862 | return; |
|
|
863 | } |
|
|
864 | |
|
|
865 | last_establish_attempt = ev_now (); |
|
|
866 | |
759 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
867 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
760 | ? (retry_cnt & 3) + 1 |
868 | ? (retry_cnt & 3) + 1 |
761 | : 1 << (retry_cnt >> 2)); |
869 | : 1 << (retry_cnt >> 2)); |
762 | |
870 | |
763 | reset_si (); |
871 | reset_si (); |
764 | |
872 | |
765 | bool slow = si.prot & PROT_SLOW; |
873 | bool slow = si.prot & PROT_SLOW; |
766 | |
874 | |
767 | if (si.prot && !si.host) |
875 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
768 | { |
876 | { |
769 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
770 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
877 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
771 | w.start (1); |
878 | w.start (1); |
772 | vpn->send_connect_request (conf->id); |
879 | vpn->send_connect_request (this); |
773 | } |
880 | } |
774 | else |
881 | else |
775 | { |
882 | { |
776 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
883 | if (si.valid ()) |
|
|
884 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
885 | conf->nodename, (const char *)si); |
777 | |
886 | |
778 | const sockinfo &dsi = forward_si (si); |
887 | const sockinfo &dsi = forward_si (si); |
779 | |
888 | |
780 | slow = slow || (dsi.prot & PROT_SLOW); |
889 | slow = slow || (dsi.prot & PROT_SLOW); |
781 | |
890 | |
… | |
… | |
786 | else |
895 | else |
787 | send_ping (dsi, 0); |
896 | send_ping (dsi, 0); |
788 | } |
897 | } |
789 | } |
898 | } |
790 | |
899 | |
791 | retry_int *= slow ? 8. : 0.7; |
900 | retry_int *= slow ? 8. : 0.9; |
792 | |
901 | |
793 | if (retry_int < conf->max_retry) |
902 | if (retry_int < conf->max_retry) |
794 | retry_cnt++; |
903 | retry_cnt++; |
795 | else |
904 | else |
796 | retry_int = conf->max_retry; |
905 | retry_int = conf->max_retry; |
… | |
… | |
806 | { |
915 | { |
807 | slog (L_INFO, _("%s(%s): connection lost"), |
916 | slog (L_INFO, _("%s(%s): connection lost"), |
808 | conf->nodename, (const char *)si); |
917 | conf->nodename, (const char *)si); |
809 | |
918 | |
810 | if (::conf.script_node_down) |
919 | if (::conf.script_node_down) |
811 | if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
920 | { |
|
|
921 | run_script_cb *cb = new run_script_cb; |
|
|
922 | cb->set<connection, &connection::script_node_down> (this); |
812 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
923 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
924 | } |
813 | } |
925 | } |
814 | |
926 | |
815 | delete ictx; ictx = 0; |
927 | delete ictx; ictx = 0; |
816 | delete octx; octx = 0; |
928 | delete octx; octx = 0; |
817 | #if ENABLE_DNS |
929 | #if ENABLE_DNS |
818 | dnsv4_reset_connection (); |
930 | dnsv4_reset_connection (); |
819 | #endif |
931 | #endif |
820 | |
932 | |
821 | si.host = 0; |
933 | si.host = 0; |
822 | |
934 | |
823 | last_activity = 0; |
935 | last_activity = 0.; |
|
|
936 | //last_si_change = 0.; |
824 | retry_cnt = 0; |
937 | retry_cnt = 0; |
825 | |
938 | |
826 | rekey.stop (); |
939 | rekey.stop (); |
827 | keepalive.stop (); |
940 | keepalive.stop (); |
828 | establish_connection.stop (); |
941 | establish_connection.stop (); |
… | |
… | |
835 | send_reset (si); |
948 | send_reset (si); |
836 | |
949 | |
837 | reset_connection (); |
950 | reset_connection (); |
838 | } |
951 | } |
839 | |
952 | |
840 | void |
953 | // poor-man's rekeying |
|
|
954 | inline void |
841 | connection::rekey_cb (ev::timer &w, int revents) |
955 | connection::rekey_cb (ev::timer &w, int revents) |
842 | { |
956 | { |
843 | reset_connection (); |
957 | reset_connection (); |
844 | establish_connection (); |
958 | establish_connection (); |
845 | } |
959 | } |
… | |
… | |
862 | if (oseqno > MAX_SEQNO) |
976 | if (oseqno > MAX_SEQNO) |
863 | rekey (); |
977 | rekey (); |
864 | } |
978 | } |
865 | |
979 | |
866 | void |
980 | void |
|
|
981 | connection::post_inject_queue () |
|
|
982 | { |
|
|
983 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
984 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
985 | establish_connection.stop (); |
|
|
986 | |
|
|
987 | establish_connection (); |
|
|
988 | } |
|
|
989 | |
|
|
990 | void |
867 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
991 | connection::inject_data_packet (tap_packet *pkt) |
868 | { |
992 | { |
869 | if (ictx && octx) |
993 | if (ictx && octx) |
870 | send_data_packet (pkt); |
994 | send_data_packet (pkt); |
871 | else |
995 | else |
872 | { |
996 | { |
873 | if (!broadcast) |
|
|
874 | data_queue.put (new tap_packet (*pkt)); |
997 | data_queue.put (new tap_packet (*pkt)); |
875 | |
998 | post_inject_queue (); |
876 | establish_connection (); |
|
|
877 | } |
999 | } |
878 | } |
1000 | } |
879 | |
1001 | |
|
|
1002 | void |
880 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1003 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
881 | { |
1004 | { |
882 | if (ictx && octx) |
1005 | if (ictx && octx) |
883 | send_vpn_packet (pkt, si, tos); |
1006 | send_vpn_packet (pkt, si, tos); |
884 | else |
1007 | else |
885 | { |
1008 | { |
886 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
1009 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
887 | |
1010 | post_inject_queue (); |
888 | establish_connection (); |
|
|
889 | } |
1011 | } |
890 | } |
1012 | } |
891 | |
1013 | |
892 | void |
1014 | void |
893 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1015 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
894 | { |
1016 | { |
895 | last_activity = ev_now (); |
1017 | last_activity = ev_now (); |
896 | |
1018 | |
897 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1019 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
898 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1020 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
899 | |
1021 | |
900 | if (connectmode == conf_node::C_DISABLED) |
1022 | if (connectmode == conf_node::C_DISABLED) |
901 | return; |
1023 | return; |
902 | |
1024 | |
903 | switch (pkt->typ ()) |
1025 | switch (pkt->typ ()) |
904 | { |
1026 | { |
905 | case vpn_packet::PT_PING: |
1027 | case vpn_packet::PT_PING: |
|
|
1028 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1029 | |
906 | // we send pings instead of auth packets after some retries, |
1030 | // we send pings instead of auth packets after some retries, |
907 | // so reset the retry counter and establish a connection |
1031 | // so reset the retry counter and establish a connection |
908 | // when we receive a ping. |
1032 | // when we receive a ping. |
909 | if (!ictx) |
1033 | if (!ictx) |
910 | { |
1034 | { |
911 | if (auth_rate_limiter.can (rsi)) |
1035 | if (auth_rate_limiter.can (rsi)) |
912 | send_auth_request (rsi, true); |
1036 | send_auth_request (rsi, true); |
913 | } |
1037 | } |
914 | else |
1038 | else |
|
|
1039 | // we would love to change the socket address here, but ping's aren't |
|
|
1040 | // authenticated, so we best ignore it. |
915 | send_ping (rsi, 1); // pong |
1041 | send_ping (rsi, 1); // pong |
916 | |
1042 | |
917 | break; |
1043 | break; |
918 | |
1044 | |
919 | case vpn_packet::PT_PONG: |
1045 | case vpn_packet::PT_PONG: |
|
|
1046 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1047 | |
|
|
1048 | // a PONG might mean that the other side doesn't really know |
|
|
1049 | // about our desire for communication. |
|
|
1050 | establish_connection (); |
920 | break; |
1051 | break; |
921 | |
1052 | |
922 | case vpn_packet::PT_RESET: |
1053 | case vpn_packet::PT_RESET: |
923 | { |
1054 | { |
924 | reset_connection (); |
1055 | reset_connection (); |
925 | |
1056 | |
926 | config_packet *p = (config_packet *) pkt; |
1057 | config_packet *p = (config_packet *) pkt; |
927 | |
1058 | |
928 | if (!p->chk_config ()) |
1059 | if (!p->chk_config ()) |
929 | { |
1060 | { |
930 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1061 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
931 | conf->nodename, (const char *)rsi); |
1062 | conf->nodename, (const char *)rsi); |
932 | connectmode = conf_node::C_DISABLED; |
1063 | connectmode = conf_node::C_DISABLED; |
933 | } |
1064 | } |
934 | else if (connectmode == conf_node::C_ALWAYS) |
1065 | else if (connectmode == conf_node::C_ALWAYS) |
935 | establish_connection (); |
1066 | establish_connection (); |
… | |
… | |
937 | break; |
1068 | break; |
938 | |
1069 | |
939 | case vpn_packet::PT_AUTH_REQ: |
1070 | case vpn_packet::PT_AUTH_REQ: |
940 | if (auth_rate_limiter.can (rsi)) |
1071 | if (auth_rate_limiter.can (rsi)) |
941 | { |
1072 | { |
942 | auth_req_packet *p = (auth_req_packet *) pkt; |
1073 | auth_req_packet *p = (auth_req_packet *)pkt; |
943 | |
1074 | |
944 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1075 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1076 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1077 | p->protocols, p->features); |
945 | |
1078 | |
946 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1079 | if (p->chk_config () |
|
|
1080 | && (!memcmp (p->magic, MAGIC_OLD, 8) || !memcmp (p->magic, MAGIC, 8))) |
947 | { |
1081 | { |
948 | if (p->prot_minor != PROTOCOL_MINOR) |
1082 | if (p->prot_minor != PROTOCOL_MINOR) |
949 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1083 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
950 | conf->nodename, (const char *)rsi, |
1084 | conf->nodename, (const char *)rsi, |
951 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1085 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
… | |
… | |
977 | |
1111 | |
978 | break; |
1112 | break; |
979 | } |
1113 | } |
980 | } |
1114 | } |
981 | else |
1115 | else |
982 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1116 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
983 | conf->nodename, (const char *)rsi); |
1117 | conf->nodename, (const char *)rsi); |
984 | |
1118 | |
985 | send_reset (rsi); |
1119 | send_reset (rsi); |
986 | } |
1120 | } |
987 | |
1121 | |
988 | break; |
1122 | break; |
989 | |
1123 | |
990 | case vpn_packet::PT_AUTH_RES: |
1124 | case vpn_packet::PT_AUTH_RES: |
991 | { |
1125 | { |
992 | auth_res_packet *p = (auth_res_packet *) pkt; |
1126 | auth_res_packet *p = (auth_res_packet *)pkt; |
993 | |
1127 | |
994 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1128 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
995 | |
1129 | |
996 | if (p->chk_config ()) |
1130 | if (p->chk_config ()) |
997 | { |
1131 | { |
998 | if (p->prot_minor != PROTOCOL_MINOR) |
1132 | if (p->prot_minor != PROTOCOL_MINOR) |
999 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1133 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
… | |
… | |
1002 | |
1136 | |
1003 | rsachallenge chg; |
1137 | rsachallenge chg; |
1004 | |
1138 | |
1005 | if (!rsa_cache.find (p->id, chg)) |
1139 | if (!rsa_cache.find (p->id, chg)) |
1006 | { |
1140 | { |
1007 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1141 | slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."), |
1008 | conf->nodename, (const char *)rsi); |
1142 | conf->nodename, (const char *)rsi); |
1009 | break; |
1143 | break; |
1010 | } |
1144 | } |
1011 | else |
1145 | else |
1012 | { |
1146 | { |
1013 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1147 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1014 | |
1148 | |
1015 | if (!p->hmac_chk (cctx)) |
1149 | if (!p->hmac_chk (cctx)) |
1016 | { |
1150 | { |
1017 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1151 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1018 | "could be an attack, or just corruption or a synchronization error"), |
1152 | "could be an attack, or just corruption or a synchronization error."), |
1019 | conf->nodename, (const char *)rsi); |
1153 | conf->nodename, (const char *)rsi); |
1020 | break; |
1154 | break; |
1021 | } |
1155 | } |
1022 | else |
1156 | else |
1023 | { |
1157 | { |
… | |
… | |
1034 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1168 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1035 | |
1169 | |
1036 | si = rsi; |
1170 | si = rsi; |
1037 | protocol = rsi.prot; |
1171 | protocol = rsi.prot; |
1038 | |
1172 | |
|
|
1173 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
1174 | conf->nodename, (const char *)rsi, |
|
|
1175 | is_direct ? "direct" : "forwarded", |
|
|
1176 | p->prot_major, p->prot_minor); |
|
|
1177 | |
1039 | connection_established (); |
1178 | connection_established (); |
1040 | |
1179 | |
1041 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1042 | conf->nodename, (const char *)rsi, |
|
|
1043 | p->prot_major, p->prot_minor); |
|
|
1044 | |
|
|
1045 | if (::conf.script_node_up) |
1180 | if (::conf.script_node_up) |
1046 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
1181 | { |
|
|
1182 | run_script_cb *cb = new run_script_cb; |
|
|
1183 | cb->set<connection, &connection::script_node_up> (this); |
1047 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
1184 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
1185 | } |
1048 | |
1186 | |
1049 | break; |
1187 | break; |
1050 | } |
1188 | } |
1051 | else |
1189 | else |
1052 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1190 | slog (L_ERR, _("%s(%s): sent and received challenge do not match."), |
1053 | conf->nodename, (const char *)rsi); |
1191 | conf->nodename, (const char *)rsi); |
1054 | } |
1192 | } |
1055 | |
1193 | |
1056 | delete cctx; |
1194 | delete cctx; |
1057 | } |
1195 | } |
… | |
… | |
1073 | { |
1211 | { |
1074 | vpndata_packet *p = (vpndata_packet *)pkt; |
1212 | vpndata_packet *p = (vpndata_packet *)pkt; |
1075 | |
1213 | |
1076 | if (!p->hmac_chk (ictx)) |
1214 | if (!p->hmac_chk (ictx)) |
1077 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1215 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1078 | "could be an attack, or just corruption or a synchronization error"), |
1216 | "could be an attack, or just corruption or a synchronization error."), |
1079 | conf->nodename, (const char *)rsi); |
1217 | conf->nodename, (const char *)rsi); |
1080 | else |
1218 | else |
1081 | { |
1219 | { |
1082 | u32 seqno; |
1220 | u32 seqno; |
1083 | tap_packet *d = p->unpack (this, seqno); |
1221 | tap_packet *d = p->unpack (this, seqno); |
|
|
1222 | int seqclass = iseqno.seqno_classify (seqno); |
1084 | |
1223 | |
1085 | if (iseqno.recv_ok (seqno)) |
1224 | if (seqclass == 0) // ok |
1086 | { |
1225 | { |
1087 | vpn->tap->send (d); |
1226 | vpn->tap->send (d); |
1088 | |
1227 | |
1089 | if (si != rsi) |
1228 | if (si != rsi) |
1090 | { |
1229 | { |
1091 | // fast re-sync on source address changes, useful especially for tcp/ip |
1230 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1231 | //if (last_si_change < ev_now () + 5.) |
1092 | si = rsi; |
1232 | // { |
1093 | |
|
|
1094 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1233 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1095 | conf->nodename, (const char *)si, (const char *)rsi); |
1234 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1235 | |
|
|
1236 | si = rsi; |
|
|
1237 | |
|
|
1238 | if (::conf.script_node_change) |
|
|
1239 | { |
|
|
1240 | run_script_cb *cb = new run_script_cb; |
|
|
1241 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1242 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1243 | } |
|
|
1244 | |
|
|
1245 | // } |
|
|
1246 | //else |
|
|
1247 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1248 | // conf->nodename, (const char *)si, (const char *)rsi); |
1096 | } |
1249 | } |
|
|
1250 | } |
|
|
1251 | else if (seqclass == 1) // far history |
|
|
1252 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1253 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1254 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1255 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1256 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1257 | else if (seqclass == 3) // reset |
|
|
1258 | { |
|
|
1259 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1260 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1261 | send_reset (rsi); |
1097 | } |
1262 | } |
1098 | |
1263 | |
1099 | delete d; |
1264 | delete d; |
1100 | break; |
1265 | break; |
1101 | } |
1266 | } |
… | |
… | |
1105 | break; |
1270 | break; |
1106 | |
1271 | |
1107 | case vpn_packet::PT_CONNECT_REQ: |
1272 | case vpn_packet::PT_CONNECT_REQ: |
1108 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1273 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1109 | { |
1274 | { |
1110 | connect_req_packet *p = (connect_req_packet *) pkt; |
1275 | connect_req_packet *p = (connect_req_packet *)pkt; |
1111 | |
1276 | |
1112 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1277 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1113 | { |
1278 | { |
1114 | connection *c = vpn->conns[p->id - 1]; |
1279 | connection *c = vpn->conns[p->id - 1]; |
1115 | conf->protocols = p->protocols; |
1280 | conf->protocols = p->protocols; |
1116 | |
1281 | |
1117 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
1282 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1283 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1284 | p->protocols, |
1118 | conf->id, p->id, c->ictx && c->octx); |
1285 | c->ictx && c->octx); |
1119 | |
1286 | |
1120 | if (c->ictx && c->octx) |
1287 | if (c->ictx && c->octx) |
1121 | { |
1288 | { |
1122 | // send connect_info packets to both sides, in case one is |
1289 | // send connect_info packets to both sides, in case one is |
1123 | // behind a nat firewall (or both ;) |
1290 | // behind a nat firewall (or both ;) |
… | |
… | |
1146 | |
1313 | |
1147 | c->conf->protocols = p->protocols; |
1314 | c->conf->protocols = p->protocols; |
1148 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1315 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1149 | p->si.upgrade_protocol (protocol, c->conf); |
1316 | p->si.upgrade_protocol (protocol, c->conf); |
1150 | |
1317 | |
1151 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1318 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,p%02x) [%d]", |
1152 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1319 | conf->nodename, |
|
|
1320 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1321 | (const char *)p->si, |
|
|
1322 | p->protocols, |
|
|
1323 | !c->ictx && !c->octx); |
1153 | |
1324 | |
1154 | const sockinfo &dsi = forward_si (p->si); |
1325 | const sockinfo &dsi = forward_si (p->si); |
1155 | |
1326 | |
1156 | if (dsi.valid ()) |
1327 | if (dsi.valid ()) |
1157 | c->send_auth_request (dsi, true); |
1328 | c->send_auth_request (dsi, true); |
… | |
… | |
1168 | send_reset (rsi); |
1339 | send_reset (rsi); |
1169 | break; |
1340 | break; |
1170 | } |
1341 | } |
1171 | } |
1342 | } |
1172 | |
1343 | |
|
|
1344 | inline void |
1173 | void connection::keepalive_cb (ev::timer &w, int revents) |
1345 | connection::keepalive_cb (ev::timer &w, int revents) |
1174 | { |
1346 | { |
1175 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1347 | if (ev_now () >= last_activity + ::conf.keepalive + 15) |
1176 | { |
1348 | { |
1177 | reset_connection (); |
1349 | reset_connection (); |
1178 | establish_connection (); |
1350 | establish_connection (); |
1179 | } |
1351 | } |
1180 | else if (ev_now () < last_activity + ::conf.keepalive) |
1352 | else if (ev_now () < last_activity + ::conf.keepalive) |
1181 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1353 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1182 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1354 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1183 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1355 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1184 | { |
1356 | { |
1185 | send_ping (si); |
1357 | send_ping (si); |
1186 | w.start (5); |
1358 | w.start (3); |
1187 | } |
1359 | } |
1188 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1360 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
1189 | // hold ondemand connections implicitly a few seconds longer |
1361 | // hold ondemand connections implicitly a few seconds longer |
1190 | // should delete octx, though, or something like that ;) |
1362 | // should delete octx, though, or something like that ;) |
1191 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1363 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1192 | else |
1364 | else |
1193 | reset_connection (); |
1365 | reset_connection (); |
1194 | } |
1366 | } |
1195 | |
1367 | |
|
|
1368 | void |
1196 | void connection::send_connect_request (int id) |
1369 | connection::send_connect_request (int id) |
1197 | { |
1370 | { |
1198 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1371 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1199 | |
1372 | |
1200 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1373 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1374 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1375 | THISNODE->protocols); |
1201 | p->hmac_set (octx); |
1376 | p->hmac_set (octx); |
1202 | send_vpn_packet (p, si); |
1377 | send_vpn_packet (p, si); |
1203 | |
1378 | |
1204 | delete p; |
1379 | delete p; |
1205 | } |
1380 | } |
1206 | |
1381 | |
|
|
1382 | void |
1207 | void connection::script_init_env (const char *ext) |
1383 | connection::script_init_env (const char *ext) |
1208 | { |
1384 | { |
1209 | char *env; |
1385 | char *env; |
1210 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1386 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1211 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1387 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1212 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1388 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1213 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1389 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1214 | conf->id & 0xff); putenv (env); |
1390 | conf->id & 0xff); putenv (env); |
1215 | } |
1391 | } |
1216 | |
1392 | |
|
|
1393 | void |
1217 | void connection::script_init_connect_env () |
1394 | connection::script_init_connect_env () |
1218 | { |
1395 | { |
1219 | vpn->script_init_env (); |
1396 | vpn->script_init_env (); |
1220 | |
1397 | |
1221 | char *env; |
1398 | char *env; |
1222 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1399 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1400 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1223 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1401 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1224 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1402 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1225 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1403 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1226 | } |
1404 | } |
1227 | |
1405 | |
|
|
1406 | inline const char * |
1228 | const char *connection::script_node_up () |
1407 | connection::script_node_up () |
1229 | { |
1408 | { |
1230 | script_init_connect_env (); |
1409 | script_init_connect_env (); |
1231 | |
1410 | |
1232 | putenv ((char *)"STATE=up"); |
1411 | putenv ((char *)"STATE=up"); |
1233 | |
1412 | |
… | |
… | |
1238 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1417 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1239 | |
1418 | |
1240 | return filename; |
1419 | return filename; |
1241 | } |
1420 | } |
1242 | |
1421 | |
|
|
1422 | inline const char * |
|
|
1423 | connection::script_node_change () |
|
|
1424 | { |
|
|
1425 | script_init_connect_env (); |
|
|
1426 | |
|
|
1427 | putenv ((char *)"STATE=change"); |
|
|
1428 | |
|
|
1429 | char *filename; |
|
|
1430 | asprintf (&filename, |
|
|
1431 | "%s/%s", |
|
|
1432 | confbase, |
|
|
1433 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
|
|
1434 | |
|
|
1435 | return filename; |
|
|
1436 | } |
|
|
1437 | |
|
|
1438 | inline const char * |
1243 | const char *connection::script_node_down () |
1439 | connection::script_node_down () |
1244 | { |
1440 | { |
1245 | script_init_connect_env (); |
1441 | script_init_connect_env (); |
1246 | |
1442 | |
1247 | putenv ((char *)"STATE=down"); |
1443 | putenv ((char *)"STATE=down"); |
1248 | |
1444 | |
… | |
… | |
1254 | |
1450 | |
1255 | return filename; |
1451 | return filename; |
1256 | } |
1452 | } |
1257 | |
1453 | |
1258 | connection::connection (struct vpn *vpn, conf_node *conf) |
1454 | connection::connection (struct vpn *vpn, conf_node *conf) |
1259 | : vpn(vpn), conf(conf) |
1455 | : vpn(vpn), conf(conf), |
1260 | , rekey (this, &connection::rekey_cb) |
|
|
1261 | , keepalive (this, &connection::keepalive_cb) |
|
|
1262 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1263 | #if ENABLE_DNS |
1456 | #if ENABLE_DNS |
1264 | , dns (0) |
1457 | dns (0), |
1265 | #endif |
1458 | #endif |
|
|
1459 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1460 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1266 | { |
1461 | { |
|
|
1462 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1463 | keepalive .set<connection, &connection::keepalive_cb > (this); |
|
|
1464 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
|
|
1465 | |
|
|
1466 | last_establish_attempt = 0.; |
1267 | octx = ictx = 0; |
1467 | octx = ictx = 0; |
1268 | retry_cnt = 0; |
|
|
1269 | |
1468 | |
1270 | if (!conf->protocols) // make sure some protocol is enabled |
1469 | connectmode = conf->connectmode; |
1271 | conf->protocols = PROT_UDPv4; |
|
|
1272 | |
1470 | |
1273 | connectmode = conf_node::C_ALWAYS; // initial setting |
1471 | // queue a dummy packet to force an initial connection attempt |
|
|
1472 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1473 | vpn_queue.put (new net_packet); |
|
|
1474 | |
1274 | reset_connection (); |
1475 | reset_connection (); |
1275 | } |
1476 | } |
1276 | |
1477 | |
1277 | connection::~connection () |
1478 | connection::~connection () |
1278 | { |
1479 | { |
1279 | shutdown (); |
1480 | shutdown (); |
1280 | } |
1481 | } |
1281 | |
1482 | |
|
|
1483 | void |
1282 | void connection_init () |
1484 | connection_init () |
1283 | { |
1485 | { |
1284 | auth_rate_limiter.clear (); |
1486 | auth_rate_limiter.clear (); |
1285 | reset_rate_limiter.clear (); |
1487 | reset_rate_limiter.clear (); |
1286 | } |
1488 | } |
1287 | |
1489 | |