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) 2003-2008,2010,2011,2013 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 | |
|
|
20 | Additional permission under GNU GPL version 3 section 7 |
|
|
21 | |
|
|
22 | If you modify this Program, or any covered work, by linking or |
|
|
23 | combining it with the OpenSSL project's OpenSSL library (or a modified |
|
|
24 | version of that library), containing parts covered by the terms of the |
|
|
25 | OpenSSL or SSLeay licenses, the licensors of this Program grant you |
|
|
26 | additional permission to convey the resulting work. Corresponding |
|
|
27 | Source for a non-source form of such a combination shall include the |
|
|
28 | source code for the parts of OpenSSL used as well as that of the |
|
|
29 | covered work. |
20 | */ |
30 | */ |
21 | |
31 | |
22 | #include "config.h" |
32 | #include "config.h" |
23 | |
33 | |
24 | #include <list> |
34 | #include <list> |
|
|
35 | #include <queue> |
|
|
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> |
… | |
… | |
31 | #include "conf.h" |
43 | #include "conf.h" |
32 | #include "slog.h" |
44 | #include "slog.h" |
33 | #include "device.h" |
45 | #include "device.h" |
34 | #include "vpn.h" |
46 | #include "vpn.h" |
35 | #include "connection.h" |
47 | #include "connection.h" |
|
|
48 | #include "hkdf.h" |
36 | |
49 | |
37 | #include "netcompat.h" |
50 | #include "netcompat.h" |
38 | |
51 | |
39 | #if !HAVE_RAND_PSEUDO_BYTES |
|
|
40 | # define RAND_pseudo_bytes RAND_bytes |
|
|
41 | #endif |
|
|
42 | |
|
|
43 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
52 | #define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic |
44 | |
53 | |
45 | #define ULTRA_FAST 1 |
54 | #define ULTRA_FAST 1 |
46 | #define HLOG 15 |
55 | #define HLOG 15 |
47 | #include "lzf/lzf.h" |
56 | #include "lzf/lzf.h" |
48 | #include "lzf/lzf_c.c" |
57 | #include "lzf/lzf_c.c" |
49 | #include "lzf/lzf_d.c" |
58 | #include "lzf/lzf_d.c" |
50 | |
59 | |
|
|
60 | ////////////////////////////////////////////////////////////////////////////// |
|
|
61 | |
|
|
62 | static std::queue< std::pair<run_script_cb *, const char *> > rs_queue; |
|
|
63 | static ev::child rs_child_ev; |
|
|
64 | |
|
|
65 | namespace |
|
|
66 | { |
|
|
67 | void // c++ requires external linkage here, apparently :( |
|
|
68 | rs_child_cb (ev::child &w, int revents) |
|
|
69 | { |
|
|
70 | w.stop (); |
|
|
71 | |
|
|
72 | if (rs_queue.empty ()) |
|
|
73 | return; |
|
|
74 | |
|
|
75 | pid_t pid = run_script (*rs_queue.front ().first, false); |
|
|
76 | if (pid) |
|
|
77 | { |
|
|
78 | w.set (pid); |
|
|
79 | w.start (); |
|
|
80 | } |
|
|
81 | else |
|
|
82 | slog (L_WARN, rs_queue.front ().second); |
|
|
83 | |
|
|
84 | delete rs_queue.front ().first; |
|
|
85 | rs_queue.pop (); |
|
|
86 | } |
|
|
87 | }; |
|
|
88 | |
|
|
89 | // despite the fancy name, this is quite a hack |
|
|
90 | static void |
|
|
91 | run_script_queued (run_script_cb *cb, const char *warnmsg) |
|
|
92 | { |
|
|
93 | rs_queue.push (std::make_pair (cb, warnmsg)); |
|
|
94 | |
|
|
95 | if (!rs_child_ev.is_active ()) |
|
|
96 | { |
|
|
97 | rs_child_ev.set<rs_child_cb> (); |
|
|
98 | rs_child_ev (); |
|
|
99 | } |
|
|
100 | } |
|
|
101 | |
|
|
102 | ////////////////////////////////////////////////////////////////////////////// |
|
|
103 | |
51 | struct crypto_ctx |
104 | struct crypto_ctx |
52 | { |
105 | { |
53 | EVP_CIPHER_CTX cctx; |
106 | EVP_CIPHER_CTX cctx; |
54 | HMAC_CTX hctx; |
107 | HMAC_CTX hctx; |
55 | |
108 | |
56 | crypto_ctx (const rsachallenge &challenge, int enc); |
109 | crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc); |
57 | ~crypto_ctx (); |
110 | ~crypto_ctx (); |
58 | }; |
111 | }; |
59 | |
112 | |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
113 | crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc) |
61 | { |
114 | { |
|
|
115 | ecdh_key s; |
|
|
116 | |
|
|
117 | curve25519_combine (a, b, s); |
|
|
118 | |
|
|
119 | { |
|
|
120 | u8 mac_key[MAC_KEYSIZE]; |
|
|
121 | static const unsigned char mac_info[] = "gvpe mac key"; |
|
|
122 | |
|
|
123 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
|
|
124 | kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm)); |
|
|
125 | kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key)); |
|
|
126 | kdf.extract (s, sizeof (s)); |
|
|
127 | kdf.extract_done (HKDF_PRF_HASH ()); |
|
|
128 | kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info)); |
|
|
129 | |
|
|
130 | HMAC_CTX_init (&hctx); |
|
|
131 | require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0)); |
|
|
132 | } |
|
|
133 | |
|
|
134 | { |
|
|
135 | u8 cipher_key[CIPHER_KEYSIZE]; |
|
|
136 | static const unsigned char cipher_info[] = "gvpe cipher key"; |
|
|
137 | |
|
|
138 | hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ()); |
|
|
139 | kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm)); |
|
|
140 | kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key)); |
|
|
141 | kdf.extract (s, sizeof (s)); |
|
|
142 | kdf.extract_done (HKDF_PRF_HASH ()); |
|
|
143 | kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info)); |
|
|
144 | |
62 | EVP_CIPHER_CTX_init (&cctx); |
145 | EVP_CIPHER_CTX_init (&cctx); |
63 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
146 | require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc)); |
64 | HMAC_CTX_init (&hctx); |
147 | } |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
|
|
66 | } |
148 | } |
67 | |
149 | |
68 | crypto_ctx::~crypto_ctx () |
150 | crypto_ctx::~crypto_ctx () |
69 | { |
151 | { |
70 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
152 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
71 | HMAC_CTX_cleanup (&hctx); |
153 | HMAC_CTX_cleanup (&hctx); |
72 | } |
154 | } |
73 | |
155 | |
|
|
156 | static inline void |
|
|
157 | auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr) |
|
|
158 | { |
|
|
159 | if (RSA_public_encrypt (sizeof (auth.rsa), |
|
|
160 | (unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa, |
|
|
161 | key, RSA_PKCS1_OAEP_PADDING) < 0) |
|
|
162 | fatal ("RSA_public_encrypt error"); |
|
|
163 | } |
|
|
164 | |
|
|
165 | static inline bool |
|
|
166 | auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth) |
|
|
167 | { |
|
|
168 | u8 rsa_decrypt[RSA_KEYLEN]; |
|
|
169 | |
|
|
170 | if (RSA_private_decrypt (sizeof (encr.rsa), |
|
|
171 | (const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt, |
|
|
172 | key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa)) |
|
|
173 | return 0; |
|
|
174 | |
|
|
175 | memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa)); |
|
|
176 | |
|
|
177 | return 1; |
|
|
178 | } |
|
|
179 | |
74 | static void |
180 | static void |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
181 | auth_hash (const auth_data &auth, auth_mac &mac) |
76 | { |
182 | { |
77 | EVP_MD_CTX ctx; |
183 | HMAC_CTX ctx; |
78 | |
184 | |
79 | EVP_MD_CTX_init (&ctx); |
185 | HMAC_CTX_init (&ctx); |
80 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
186 | require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0)); |
81 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
187 | require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth)); |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
|
|
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
188 | require (HMAC_Final (&ctx, (unsigned char *)&mac, 0)); |
84 | EVP_MD_CTX_cleanup (&ctx); |
189 | HMAC_CTX_cleanup (&ctx); |
85 | } |
190 | } |
86 | |
191 | |
87 | struct rsa_entry { |
192 | void |
88 | tstamp expire; |
193 | connection::generate_auth_data () |
89 | rsaid id; |
|
|
90 | rsachallenge chg; |
|
|
91 | }; |
|
|
92 | |
|
|
93 | struct rsa_cache : list<rsa_entry> |
|
|
94 | { |
194 | { |
95 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
195 | if (auth_expire < ev_now ()) |
96 | |
|
|
97 | bool find (const rsaid &id, rsachallenge &chg) |
|
|
98 | { |
|
|
99 | for (iterator i = begin (); i != end (); ++i) |
|
|
100 | { |
196 | { |
101 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
197 | // request data |
102 | { |
198 | RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa); |
103 | memcpy (&chg, &i->chg, sizeof chg); |
199 | curve25519_generate (snd_ecdh_a, snd_auth.ecdh); |
|
|
200 | auth_hash (snd_auth, snd_auth_mac); |
104 | |
201 | |
105 | erase (i); |
202 | // eventual response data |
106 | return true; |
203 | curve25519_generate (rcv_ecdh_a, rcv_ecdh_b); |
107 | } |
|
|
108 | } |
204 | } |
109 | |
205 | |
110 | if (cleaner.at < NOW) |
206 | // every use prolongs the expiry |
111 | cleaner.start (NOW + RSA_TTL); |
207 | auth_expire = ev_now () + AUTH_TTL; |
112 | |
|
|
113 | return false; |
|
|
114 | } |
|
|
115 | |
|
|
116 | void gen (rsaid &id, rsachallenge &chg) |
|
|
117 | { |
|
|
118 | rsa_entry e; |
|
|
119 | |
|
|
120 | RAND_bytes ((unsigned char *)&id, sizeof id); |
|
|
121 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
|
|
122 | |
|
|
123 | e.expire = NOW + RSA_TTL; |
|
|
124 | e.id = id; |
|
|
125 | memcpy (&e.chg, &chg, sizeof chg); |
|
|
126 | |
|
|
127 | push_back (e); |
|
|
128 | |
|
|
129 | if (cleaner.at < NOW) |
|
|
130 | cleaner.start (NOW + RSA_TTL); |
|
|
131 | } |
|
|
132 | |
|
|
133 | rsa_cache () |
|
|
134 | : cleaner (this, &rsa_cache::cleaner_cb) |
|
|
135 | { } |
|
|
136 | |
|
|
137 | } rsa_cache; |
|
|
138 | |
|
|
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
|
|
140 | { |
|
|
141 | if (!empty ()) |
|
|
142 | { |
|
|
143 | w.start (NOW + RSA_TTL); |
|
|
144 | |
|
|
145 | for (iterator i = begin (); i != end (); ) |
|
|
146 | if (i->expire <= NOW) |
|
|
147 | i = erase (i); |
|
|
148 | else |
|
|
149 | ++i; |
|
|
150 | } |
|
|
151 | } |
208 | } |
152 | |
209 | |
153 | ////////////////////////////////////////////////////////////////////////////// |
210 | ////////////////////////////////////////////////////////////////////////////// |
154 | |
211 | |
155 | void pkt_queue::put (net_packet *p) |
212 | pkt_queue::pkt_queue (double max_ttl, int max_queue) |
|
|
213 | : max_ttl (max_ttl), max_queue (max_queue) |
156 | { |
214 | { |
157 | if (queue[i]) |
215 | queue = new pkt [max_queue]; |
158 | { |
|
|
159 | delete queue[i]; |
|
|
160 | j = (j + 1) % QUEUEDEPTH; |
|
|
161 | } |
|
|
162 | |
216 | |
163 | queue[i] = p; |
|
|
164 | |
|
|
165 | i = (i + 1) % QUEUEDEPTH; |
|
|
166 | } |
|
|
167 | |
|
|
168 | net_packet *pkt_queue::get () |
|
|
169 | { |
|
|
170 | net_packet *p = queue[j]; |
|
|
171 | |
|
|
172 | if (p) |
|
|
173 | { |
|
|
174 | queue[j] = 0; |
|
|
175 | j = (j + 1) % QUEUEDEPTH; |
|
|
176 | } |
|
|
177 | |
|
|
178 | return p; |
|
|
179 | } |
|
|
180 | |
|
|
181 | pkt_queue::pkt_queue () |
|
|
182 | { |
|
|
183 | memset (queue, 0, sizeof (queue)); |
|
|
184 | i = 0; |
217 | i = 0; |
185 | j = 0; |
218 | j = 0; |
|
|
219 | |
|
|
220 | expire.set<pkt_queue, &pkt_queue::expire_cb> (this); |
186 | } |
221 | } |
187 | |
222 | |
188 | pkt_queue::~pkt_queue () |
223 | pkt_queue::~pkt_queue () |
189 | { |
224 | { |
190 | for (i = QUEUEDEPTH; --i > 0; ) |
225 | while (net_packet *p = get ()) |
|
|
226 | delete p; |
|
|
227 | |
191 | delete queue[i]; |
228 | delete [] queue; |
192 | } |
229 | } |
193 | |
230 | |
|
|
231 | void |
|
|
232 | pkt_queue::expire_cb (ev::timer &w, int revents) |
|
|
233 | { |
|
|
234 | ev_tstamp expire = ev_now () - max_ttl; |
|
|
235 | |
|
|
236 | for (;;) |
|
|
237 | { |
|
|
238 | if (empty ()) |
|
|
239 | break; |
|
|
240 | |
|
|
241 | double diff = queue[j].tstamp - expire; |
|
|
242 | |
|
|
243 | if (diff >= 0.) |
|
|
244 | { |
|
|
245 | w.start (diff > 0.5 ? diff : 0.5); |
|
|
246 | break; |
|
|
247 | } |
|
|
248 | |
|
|
249 | delete get (); |
|
|
250 | } |
|
|
251 | } |
|
|
252 | |
|
|
253 | void |
|
|
254 | pkt_queue::put (net_packet *p) |
|
|
255 | { |
|
|
256 | ev_tstamp now = ev_now (); |
|
|
257 | |
|
|
258 | // start expiry timer |
|
|
259 | if (empty ()) |
|
|
260 | expire.start (max_ttl); |
|
|
261 | |
|
|
262 | int ni = i + 1 == max_queue ? 0 : i + 1; |
|
|
263 | |
|
|
264 | if (ni == j) |
|
|
265 | delete get (); |
|
|
266 | |
|
|
267 | queue[i].pkt = p; |
|
|
268 | queue[i].tstamp = now; |
|
|
269 | |
|
|
270 | i = ni; |
|
|
271 | } |
|
|
272 | |
|
|
273 | net_packet * |
|
|
274 | pkt_queue::get () |
|
|
275 | { |
|
|
276 | if (empty ()) |
|
|
277 | return 0; |
|
|
278 | |
|
|
279 | net_packet *p = queue[j].pkt; |
|
|
280 | queue[j].pkt = 0; |
|
|
281 | |
|
|
282 | j = j + 1 == max_queue ? 0 : j + 1; |
|
|
283 | |
|
|
284 | return p; |
|
|
285 | } |
|
|
286 | |
194 | struct net_rateinfo { |
287 | struct net_rateinfo |
|
|
288 | { |
195 | u32 host; |
289 | u32 host; |
196 | double pcnt, diff; |
290 | double pcnt, diff; |
197 | tstamp last; |
291 | tstamp last; |
198 | }; |
292 | }; |
199 | |
293 | |
… | |
… | |
209 | |
303 | |
210 | bool can (const sockinfo &si) { return can((u32)si.host); } |
304 | bool can (const sockinfo &si) { return can((u32)si.host); } |
211 | bool can (u32 host); |
305 | bool can (u32 host); |
212 | }; |
306 | }; |
213 | |
307 | |
214 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
308 | static net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
215 | |
309 | |
|
|
310 | bool |
216 | bool net_rate_limiter::can (u32 host) |
311 | net_rate_limiter::can (u32 host) |
217 | { |
312 | { |
218 | iterator i; |
313 | iterator i; |
219 | |
314 | |
220 | for (i = begin (); i != end (); ) |
315 | for (i = begin (); i != end (); ) |
221 | if (i->host == host) |
316 | if (i->host == host) |
222 | break; |
317 | break; |
223 | else if (i->last < NOW - NRL_EXPIRE) |
318 | else if (i->last < ev_now () - NRL_EXPIRE) |
224 | i = erase (i); |
319 | i = erase (i); |
225 | else |
320 | else |
226 | i++; |
321 | i++; |
227 | |
322 | |
228 | if (i == end ()) |
323 | if (i == end ()) |
… | |
… | |
230 | net_rateinfo ri; |
325 | net_rateinfo ri; |
231 | |
326 | |
232 | ri.host = host; |
327 | ri.host = host; |
233 | ri.pcnt = 1.; |
328 | ri.pcnt = 1.; |
234 | ri.diff = NRL_MAXDIF; |
329 | ri.diff = NRL_MAXDIF; |
235 | ri.last = NOW; |
330 | ri.last = ev_now (); |
236 | |
331 | |
237 | push_front (ri); |
332 | push_front (ri); |
238 | |
333 | |
239 | return true; |
334 | return true; |
240 | } |
335 | } |
… | |
… | |
242 | { |
337 | { |
243 | net_rateinfo ri (*i); |
338 | net_rateinfo ri (*i); |
244 | erase (i); |
339 | erase (i); |
245 | |
340 | |
246 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
341 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
247 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
342 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
248 | |
343 | |
249 | ri.last = NOW; |
344 | ri.last = ev_now (); |
250 | |
345 | |
251 | double dif = ri.diff / ri.pcnt; |
346 | double dif = ri.diff / ri.pcnt; |
252 | |
347 | |
253 | bool send = dif > NRL_CUTOFF; |
348 | bool send = dif > NRL_CUTOFF; |
254 | |
349 | |
… | |
… | |
268 | |
363 | |
269 | ///////////////////////////////////////////////////////////////////////////// |
364 | ///////////////////////////////////////////////////////////////////////////// |
270 | |
365 | |
271 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
366 | unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
272 | |
367 | |
|
|
368 | void |
273 | void hmac_packet::hmac_gen (crypto_ctx *ctx) |
369 | hmac_packet::hmac_gen (crypto_ctx *ctx) |
274 | { |
370 | { |
275 | unsigned int xlen; |
371 | unsigned int xlen; |
276 | |
372 | |
277 | HMAC_CTX *hctx = &ctx->hctx; |
373 | HMAC_CTX *hctx = &ctx->hctx; |
278 | |
374 | |
279 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
375 | require (HMAC_Init_ex (hctx, 0, 0, 0, 0)); |
280 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
376 | require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
281 | len - sizeof (hmac_packet)); |
377 | len - sizeof (hmac_packet))); |
282 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
378 | require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen)); |
283 | } |
379 | } |
284 | |
380 | |
285 | void |
381 | void |
286 | hmac_packet::hmac_set (crypto_ctx *ctx) |
382 | hmac_packet::hmac_set (crypto_ctx *ctx) |
287 | { |
383 | { |
… | |
… | |
296 | hmac_gen (ctx); |
392 | hmac_gen (ctx); |
297 | |
393 | |
298 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
394 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
299 | } |
395 | } |
300 | |
396 | |
|
|
397 | void |
301 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
398 | vpn_packet::set_hdr (ptype type_, unsigned int dst) |
302 | { |
399 | { |
303 | type = type_; |
400 | type = type_; |
304 | |
401 | |
305 | int src = THISNODE->id; |
402 | int src = THISNODE->id; |
306 | |
403 | |
… | |
… | |
311 | |
408 | |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
409 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
410 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
314 | |
411 | |
315 | struct vpndata_packet : vpn_packet |
412 | struct vpndata_packet : vpn_packet |
|
|
413 | { |
|
|
414 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
415 | |
|
|
416 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
417 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
418 | |
|
|
419 | private: |
|
|
420 | const u32 data_hdr_size () const |
316 | { |
421 | { |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
|
|
318 | |
|
|
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
|
|
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
|
|
321 | private: |
|
|
322 | |
|
|
323 | const u32 data_hdr_size () const |
|
|
324 | { |
|
|
325 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
422 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
326 | } |
|
|
327 | }; |
423 | } |
|
|
424 | }; |
328 | |
425 | |
329 | void |
426 | void |
330 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
427 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
331 | { |
428 | { |
332 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
429 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
… | |
… | |
334 | ptype type = PT_DATA_UNCOMPRESSED; |
431 | ptype type = PT_DATA_UNCOMPRESSED; |
335 | |
432 | |
336 | #if ENABLE_COMPRESSION |
433 | #if ENABLE_COMPRESSION |
337 | u8 cdata[MAX_MTU]; |
434 | u8 cdata[MAX_MTU]; |
338 | |
435 | |
339 | if (conn->features & ENABLE_COMPRESSION) |
436 | if (conn->features & FEATURE_COMPRESSION) |
340 | { |
437 | { |
341 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
438 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
342 | |
439 | |
343 | if (cl) |
440 | if (cl) |
344 | { |
441 | { |
… | |
… | |
350 | d[1] = cl; |
447 | d[1] = cl; |
351 | } |
448 | } |
352 | } |
449 | } |
353 | #endif |
450 | #endif |
354 | |
451 | |
355 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
452 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1)); |
356 | |
453 | |
357 | struct { |
454 | struct { |
358 | #if RAND_SIZE |
455 | #if RAND_SIZE |
359 | u8 rnd[RAND_SIZE]; |
456 | u8 rnd[RAND_SIZE]; |
360 | #endif |
457 | #endif |
361 | u32 seqno; |
458 | u32 seqno; |
362 | } datahdr; |
459 | } datahdr; |
363 | |
460 | |
364 | datahdr.seqno = ntohl (seqno); |
461 | datahdr.seqno = ntohl (seqno); |
365 | #if RAND_SIZE |
462 | #if RAND_SIZE |
366 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
463 | RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
367 | #endif |
464 | #endif |
368 | |
465 | |
369 | require (EVP_EncryptUpdate (cctx, |
466 | require (EVP_EncryptUpdate (cctx, |
370 | (unsigned char *) data + outl, &outl2, |
467 | (unsigned char *) data + outl, &outl2, |
371 | (unsigned char *) &datahdr, DATAHDR)); |
468 | (unsigned char *) &datahdr, DATAHDR)); |
… | |
… | |
393 | int outl = 0, outl2; |
490 | int outl = 0, outl2; |
394 | tap_packet *p = new tap_packet; |
491 | tap_packet *p = new tap_packet; |
395 | u8 *d; |
492 | u8 *d; |
396 | u32 l = len - data_hdr_size (); |
493 | u32 l = len - data_hdr_size (); |
397 | |
494 | |
398 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
495 | require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0)); |
399 | |
496 | |
400 | #if ENABLE_COMPRESSION |
497 | #if ENABLE_COMPRESSION |
401 | u8 cdata[MAX_MTU]; |
498 | u8 cdata[MAX_MTU]; |
402 | |
499 | |
403 | if (type == PT_DATA_COMPRESSED) |
500 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
445 | } |
542 | } |
446 | }; |
543 | }; |
447 | |
544 | |
448 | struct config_packet : vpn_packet |
545 | struct config_packet : vpn_packet |
449 | { |
546 | { |
450 | // actually, hmaclen cannot be checked because the hmac |
|
|
451 | // field comes before this data, so peers with other |
|
|
452 | // hmacs simply will not work. |
|
|
453 | u8 prot_major, prot_minor, randsize, hmaclen; |
547 | u8 prot_major, prot_minor, randsize; |
454 | u8 flags, challengelen, features, pad3; |
548 | u8 flags, features, pad6, pad7, pad8; |
455 | u32 cipher_nid, digest_nid, hmac_nid; |
549 | u32 cipher_nid, mac_nid, auth_nid; |
456 | |
550 | |
457 | void setup (ptype type, int dst); |
551 | void setup (ptype type, int dst); |
458 | bool chk_config () const; |
552 | bool chk_config () const; |
459 | |
553 | |
460 | static u8 get_features () |
554 | static u8 get_features () |
… | |
… | |
464 | f |= FEATURE_COMPRESSION; |
558 | f |= FEATURE_COMPRESSION; |
465 | #endif |
559 | #endif |
466 | #if ENABLE_ROHC |
560 | #if ENABLE_ROHC |
467 | f |= FEATURE_ROHC; |
561 | f |= FEATURE_ROHC; |
468 | #endif |
562 | #endif |
|
|
563 | #if ENABLE_BRIDGING |
|
|
564 | f |= FEATURE_BRIDGING; |
|
|
565 | #endif |
469 | return f; |
566 | return f; |
470 | } |
567 | } |
471 | }; |
568 | }; |
472 | |
569 | |
|
|
570 | void |
473 | void config_packet::setup (ptype type, int dst) |
571 | config_packet::setup (ptype type, int dst) |
474 | { |
572 | { |
475 | prot_major = PROTOCOL_MAJOR; |
573 | prot_major = PROTOCOL_MAJOR; |
476 | prot_minor = PROTOCOL_MINOR; |
574 | prot_minor = PROTOCOL_MINOR; |
477 | randsize = RAND_SIZE; |
575 | randsize = RAND_SIZE; |
478 | hmaclen = HMACLENGTH; |
|
|
479 | flags = 0; |
576 | flags = 0; |
480 | challengelen = sizeof (rsachallenge); |
|
|
481 | features = get_features (); |
577 | features = get_features (); |
482 | |
578 | |
483 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
579 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ())); |
484 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
|
|
485 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
580 | mac_nid = htonl (EVP_MD_type (MAC_DIGEST ())); |
|
|
581 | auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ())); |
486 | |
582 | |
487 | len = sizeof (*this) - sizeof (net_packet); |
583 | len = sizeof (*this) - sizeof (net_packet); |
488 | set_hdr (type, dst); |
584 | set_hdr (type, dst); |
489 | } |
585 | } |
490 | |
586 | |
|
|
587 | bool |
491 | bool config_packet::chk_config () const |
588 | config_packet::chk_config () const |
492 | { |
589 | { |
493 | if (prot_major != PROTOCOL_MAJOR) |
590 | if (prot_major != PROTOCOL_MAJOR) |
494 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
591 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
495 | else if (randsize != RAND_SIZE) |
592 | else if (randsize != RAND_SIZE) |
496 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
593 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
497 | else if (hmaclen != HMACLENGTH) |
|
|
498 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
499 | else if (challengelen != sizeof (rsachallenge)) |
|
|
500 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
|
|
501 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
594 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ()))) |
502 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
595 | slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ())); |
503 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
|
|
504 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
|
|
505 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
596 | else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ()))) |
506 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
597 | slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ())); |
|
|
598 | else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ()))) |
|
|
599 | slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ())); |
507 | else |
600 | else |
508 | return true; |
601 | return true; |
509 | |
602 | |
510 | return false; |
603 | return false; |
511 | } |
604 | } |
512 | |
605 | |
513 | struct auth_req_packet : config_packet |
606 | struct auth_req_packet : config_packet // UNPROTECTED |
514 | { |
607 | { |
515 | char magic[8]; |
608 | char magic[8]; |
516 | u8 initiate; // false if this is just an automatic reply |
609 | u8 initiate; // false if this is just an automatic reply |
517 | u8 protocols; // supported protocols (will be patched on forward) |
610 | u8 protocols; // supported protocols (will be patched on forward) |
518 | u8 pad2, pad3; |
611 | u8 pad2, pad3; |
519 | rsaid id; |
612 | auth_encr encr; |
520 | rsaencrdata encr; |
|
|
521 | |
613 | |
522 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
614 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
523 | { |
615 | { |
524 | config_packet::setup (PT_AUTH_REQ, dst); |
616 | config_packet::setup (PT_AUTH_REQ, dst); |
525 | strncpy (magic, MAGIC, 8); |
617 | memcpy (magic, MAGIC, 8); |
526 | initiate = !!initiate_; |
618 | initiate = !!initiate_; |
527 | protocols = protocols_; |
619 | protocols = protocols_; |
528 | |
620 | |
529 | len = sizeof (*this) - sizeof (net_packet); |
621 | len = sizeof (*this) - sizeof (net_packet); |
530 | } |
622 | } |
531 | }; |
623 | }; |
532 | |
624 | |
533 | struct auth_res_packet : config_packet |
625 | struct auth_res_packet : config_packet // UNPROTECTED |
534 | { |
626 | { |
535 | rsaid id; |
|
|
536 | u8 pad1, pad2, pad3; |
|
|
537 | u8 response_len; // encrypted length |
|
|
538 | rsaresponse response; |
627 | auth_response response; |
539 | |
628 | |
540 | auth_res_packet (int dst) |
629 | auth_res_packet (int dst) |
541 | { |
630 | { |
542 | config_packet::setup (PT_AUTH_RES, dst); |
631 | config_packet::setup (PT_AUTH_RES, dst); |
543 | |
632 | |
… | |
… | |
577 | }; |
666 | }; |
578 | |
667 | |
579 | ///////////////////////////////////////////////////////////////////////////// |
668 | ///////////////////////////////////////////////////////////////////////////// |
580 | |
669 | |
581 | void |
670 | void |
582 | connection::connection_established () |
671 | connection::connection_established (const sockinfo &rsi) |
583 | { |
672 | { |
|
|
673 | if (!have_snd_auth || !have_rcv_auth) |
|
|
674 | return; |
|
|
675 | |
|
|
676 | si = rsi; |
|
|
677 | protocol = rsi.prot; |
|
|
678 | |
|
|
679 | slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."), |
|
|
680 | conf->nodename, (const char *)rsi, |
|
|
681 | is_direct ? "direct" : "forwarded", |
|
|
682 | PROTOCOL_MAJOR, prot_minor); |
|
|
683 | |
|
|
684 | if (::conf.script_node_up) |
|
|
685 | { |
|
|
686 | run_script_cb *cb = new run_script_cb; |
|
|
687 | cb->set<connection, &connection::script_node_up> (this); |
|
|
688 | run_script_queued (cb, _("node-up command execution failed, continuing.")); |
|
|
689 | } |
|
|
690 | |
|
|
691 | delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0); |
|
|
692 | iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff); |
|
|
693 | |
|
|
694 | delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1); |
|
|
695 | oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff; |
|
|
696 | |
584 | if (ictx && octx) |
697 | if (ictx && octx) |
585 | { |
698 | { |
586 | connectmode = conf->connectmode; |
|
|
587 | |
|
|
588 | // make sure rekeying timeouts are slightly asymmetric |
699 | // make sure rekeying timeouts are slightly asymmetric |
589 | rekey.start (NOW + ::conf.rekey |
700 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
590 | + (conf->id > THISNODE->id ? 10 : 0)); |
701 | rekey.start (rekey_interval, rekey_interval); |
|
|
702 | |
591 | keepalive.start (NOW + ::conf.keepalive); |
703 | keepalive.start (::conf.keepalive); |
592 | |
704 | |
593 | // send queued packets |
705 | // send queued packets |
594 | if (ictx && octx) |
706 | if (ictx && octx) |
595 | { |
707 | { |
596 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
708 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
597 | { |
709 | { |
598 | send_data_packet (p); |
710 | if (p->len) send_data_packet (p); |
599 | delete p; |
711 | delete p; |
600 | } |
712 | } |
601 | |
713 | |
602 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
714 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
603 | { |
715 | { |
604 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
716 | if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY); |
605 | delete p; |
717 | delete p; |
606 | } |
718 | } |
607 | } |
719 | } |
|
|
720 | |
|
|
721 | vpn->connection_established (this); |
608 | } |
722 | } |
|
|
723 | #if 0 |
609 | else |
724 | else |
610 | { |
725 | { |
611 | retry_cnt = 0; |
726 | retry_cnt = 0; |
612 | establish_connection.start (NOW + 5); |
727 | establish_connection.start (5); |
613 | keepalive.stop (); |
728 | keepalive.stop (); |
614 | rekey.stop (); |
729 | rekey.stop (); |
615 | } |
730 | } |
|
|
731 | #endif |
616 | } |
732 | } |
617 | |
733 | |
618 | void |
734 | void |
619 | connection::reset_si () |
735 | connection::reset_si () |
620 | { |
736 | { |
|
|
737 | if (vpn->can_direct (THISNODE, conf)) |
621 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
738 | protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ()); |
622 | |
739 | else |
623 | // mask out protocols we cannot establish |
740 | { |
624 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
741 | slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename); |
625 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
742 | protocol = 0; |
626 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
743 | } |
627 | |
744 | |
628 | si.set (conf, protocol); |
745 | si.set (conf, protocol); |
|
|
746 | |
|
|
747 | is_direct = si.valid (); |
629 | } |
748 | } |
630 | |
749 | |
631 | // ensure sockinfo is valid, forward if necessary |
750 | // ensure sockinfo is valid, forward if necessary |
632 | const sockinfo & |
751 | const sockinfo & |
633 | connection::forward_si (const sockinfo &si) const |
752 | connection::forward_si (const sockinfo &si) const |
634 | { |
753 | { |
635 | if (!si.valid ()) |
754 | if (!si.valid ()) |
636 | { |
755 | { |
637 | connection *r = vpn->find_router (); |
756 | connection *r = vpn->find_router_for (this); |
638 | |
757 | |
639 | if (r) |
758 | if (r) |
640 | { |
759 | { |
641 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
760 | slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."), |
642 | conf->nodename, r->conf->nodename, (const char *)r->si); |
761 | conf->nodename, r->conf->nodename); |
643 | return r->si; |
762 | return r->si; |
644 | } |
763 | } |
645 | else |
764 | else |
646 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
765 | slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."), |
647 | conf->nodename); |
766 | conf->nodename); |
648 | } |
767 | } |
649 | |
768 | |
650 | return si; |
769 | return si; |
651 | } |
770 | } |
… | |
… | |
661 | connection::send_ping (const sockinfo &si, u8 pong) |
780 | connection::send_ping (const sockinfo &si, u8 pong) |
662 | { |
781 | { |
663 | ping_packet *pkt = new ping_packet; |
782 | ping_packet *pkt = new ping_packet; |
664 | |
783 | |
665 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
784 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
785 | |
|
|
786 | slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si); |
666 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
787 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
667 | |
788 | |
668 | delete pkt; |
789 | delete pkt; |
669 | } |
790 | } |
670 | |
791 | |
… | |
… | |
685 | void |
806 | void |
686 | connection::send_auth_request (const sockinfo &si, bool initiate) |
807 | connection::send_auth_request (const sockinfo &si, bool initiate) |
687 | { |
808 | { |
688 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
809 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
689 | |
810 | |
690 | rsachallenge chg; |
811 | generate_auth_data (); |
691 | rsa_cache.gen (pkt->id, chg); |
|
|
692 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
812 | auth_encrypt (conf->rsa_key, snd_auth, pkt->encr); |
693 | |
813 | |
694 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
814 | slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si); |
695 | |
|
|
696 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
815 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
697 | |
816 | |
698 | delete pkt; |
817 | delete pkt; |
699 | } |
818 | } |
700 | |
819 | |
701 | void |
820 | void |
702 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
821 | connection::send_auth_response (const sockinfo &si) |
703 | { |
822 | { |
704 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
823 | auth_res_packet *pkt = new auth_res_packet (conf->id); |
705 | |
824 | |
706 | pkt->id = id; |
825 | auth_hash (rcv_auth, pkt->response.mac); |
|
|
826 | memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b)); |
707 | |
827 | |
708 | rsa_hash (id, chg, pkt->response); |
|
|
709 | |
|
|
710 | pkt->hmac_set (octx); |
|
|
711 | |
|
|
712 | slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
828 | slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si); |
713 | |
|
|
714 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
829 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
715 | |
830 | |
716 | delete pkt; |
831 | delete pkt; |
717 | } |
832 | } |
718 | |
833 | |
719 | void |
834 | void |
720 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
835 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
721 | { |
836 | { |
722 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
837 | slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename, |
723 | conf->id, rid, (const char *)rsi); |
838 | vpn->conns[rid - 1]->conf->nodename, (const char *)rsi, |
|
|
839 | conf->protocols); |
724 | |
840 | |
725 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
841 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
726 | |
842 | |
727 | r->hmac_set (octx); |
843 | r->hmac_set (octx); |
728 | send_vpn_packet (r, si); |
844 | send_vpn_packet (r, si); |
729 | |
845 | |
730 | delete r; |
846 | delete r; |
731 | } |
847 | } |
732 | |
848 | |
733 | void |
849 | inline void |
734 | connection::establish_connection_cb (time_watcher &w) |
850 | connection::establish_connection_cb (ev::timer &w, int revents) |
735 | { |
851 | { |
736 | if (!ictx |
852 | if (!(ictx && octx) |
737 | && conf != THISNODE |
853 | && conf != THISNODE |
738 | && connectmode != conf_node::C_NEVER |
854 | && connectmode != conf_node::C_NEVER |
739 | && connectmode != conf_node::C_DISABLED |
855 | && connectmode != conf_node::C_DISABLED |
740 | && NOW > w.at) |
856 | && !w.is_active ()) |
741 | { |
857 | { |
742 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
858 | // a bit hacky, if ondemand, and packets are no longer queued, then reset the connection |
|
|
859 | // and stop trying. should probably be handled by a per-connection expire handler. |
|
|
860 | if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ()) |
|
|
861 | { |
|
|
862 | reset_connection (); |
|
|
863 | return; |
|
|
864 | } |
743 | |
865 | |
744 | double retry_int = double (retry_cnt & 3 |
866 | last_establish_attempt = ev_now (); |
|
|
867 | |
|
|
868 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
745 | ? (retry_cnt & 3) + 1 |
869 | ? (retry_cnt & 3) + 1 |
746 | : 1 << (retry_cnt >> 2)); |
870 | : 1 << (retry_cnt >> 2)); |
747 | |
871 | |
748 | reset_si (); |
872 | reset_si (); |
749 | |
873 | |
750 | bool slow = si.prot & PROT_SLOW; |
874 | bool slow = si.prot & PROT_SLOW; |
751 | |
875 | |
752 | if (si.prot && !si.host) |
876 | if (si.prot && !si.host && vpn->can_direct (THISNODE, conf)) |
|
|
877 | { |
|
|
878 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
879 | w.start (1); |
753 | vpn->send_connect_request (conf->id); |
880 | vpn->send_connect_request (this); |
|
|
881 | } |
754 | else |
882 | else |
755 | { |
883 | { |
|
|
884 | if (si.valid ()) |
|
|
885 | slog (L_DEBUG, _("%s: sending direct connection request to %s."), |
|
|
886 | conf->nodename, (const char *)si); |
|
|
887 | |
756 | const sockinfo &dsi = forward_si (si); |
888 | const sockinfo &dsi = forward_si (si); |
757 | |
889 | |
758 | slow = slow || (dsi.prot & PROT_SLOW); |
890 | slow = slow || (dsi.prot & PROT_SLOW); |
759 | |
891 | |
760 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
892 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
… | |
… | |
764 | else |
896 | else |
765 | send_ping (dsi, 0); |
897 | send_ping (dsi, 0); |
766 | } |
898 | } |
767 | } |
899 | } |
768 | |
900 | |
769 | retry_int *= slow ? 8. : 0.7; |
901 | retry_int *= slow ? 8. : 0.9; |
770 | |
902 | |
771 | if (retry_int < conf->max_retry) |
903 | if (retry_int < conf->max_retry) |
772 | retry_cnt++; |
904 | retry_cnt++; |
773 | else |
905 | else |
774 | retry_int = conf->max_retry; |
906 | retry_int = conf->max_retry; |
775 | |
907 | |
776 | w.start (NOW + retry_int); |
908 | w.start (retry_int); |
777 | } |
909 | } |
778 | } |
910 | } |
779 | |
911 | |
780 | void |
912 | void |
781 | connection::reset_connection () |
913 | connection::reset_connection () |
… | |
… | |
784 | { |
916 | { |
785 | slog (L_INFO, _("%s(%s): connection lost"), |
917 | slog (L_INFO, _("%s(%s): connection lost"), |
786 | conf->nodename, (const char *)si); |
918 | conf->nodename, (const char *)si); |
787 | |
919 | |
788 | if (::conf.script_node_down) |
920 | if (::conf.script_node_down) |
789 | if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
921 | { |
|
|
922 | run_script_cb *cb = new run_script_cb; |
|
|
923 | cb->set<connection, &connection::script_node_down> (this); |
790 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
924 | run_script_queued (cb, _("node-down command execution failed, continuing.")); |
|
|
925 | } |
791 | } |
926 | } |
792 | |
927 | |
793 | delete ictx; ictx = 0; |
928 | delete ictx; ictx = 0; |
794 | delete octx; octx = 0; |
929 | delete octx; octx = 0; |
795 | #if ENABLE_DNS |
|
|
796 | dnsv4_reset_connection (); |
|
|
797 | #endif |
|
|
798 | |
930 | |
799 | si.host = 0; |
931 | si.host = 0; |
800 | |
932 | |
|
|
933 | have_snd_auth = false; |
|
|
934 | have_rcv_auth = false; |
|
|
935 | auth_expire = 0.; |
|
|
936 | |
801 | last_activity = 0; |
937 | last_activity = 0.; |
|
|
938 | //last_si_change = 0.; |
802 | retry_cnt = 0; |
939 | retry_cnt = 0; |
803 | |
940 | |
804 | rekey.stop (); |
941 | rekey.stop (); |
805 | keepalive.stop (); |
942 | keepalive.stop (); |
806 | establish_connection.stop (); |
943 | establish_connection.stop (); |
… | |
… | |
813 | send_reset (si); |
950 | send_reset (si); |
814 | |
951 | |
815 | reset_connection (); |
952 | reset_connection (); |
816 | } |
953 | } |
817 | |
954 | |
818 | void |
955 | // poor-man's rekeying |
819 | connection::rekey_cb (time_watcher &w) |
956 | inline void |
|
|
957 | connection::rekey_cb (ev::timer &w, int revents) |
820 | { |
958 | { |
821 | reset_connection (); |
959 | reset_connection (); |
822 | establish_connection (); |
960 | establish_connection (); |
823 | } |
961 | } |
824 | |
962 | |
… | |
… | |
840 | if (oseqno > MAX_SEQNO) |
978 | if (oseqno > MAX_SEQNO) |
841 | rekey (); |
979 | rekey (); |
842 | } |
980 | } |
843 | |
981 | |
844 | void |
982 | void |
|
|
983 | connection::post_inject_queue () |
|
|
984 | { |
|
|
985 | // force a connection every now and when when packets are sent (max 1/s) |
|
|
986 | if (ev_now () - last_establish_attempt >= 0.95) // arbitrary |
|
|
987 | establish_connection.stop (); |
|
|
988 | |
|
|
989 | establish_connection (); |
|
|
990 | } |
|
|
991 | |
|
|
992 | void |
845 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
993 | connection::inject_data_packet (tap_packet *pkt) |
846 | { |
994 | { |
847 | if (ictx && octx) |
995 | if (ictx && octx) |
848 | send_data_packet (pkt); |
996 | send_data_packet (pkt); |
849 | else |
997 | else |
850 | { |
998 | { |
851 | if (!broadcast) |
|
|
852 | data_queue.put (new tap_packet (*pkt)); |
999 | data_queue.put (new tap_packet (*pkt)); |
853 | |
1000 | post_inject_queue (); |
854 | establish_connection (); |
|
|
855 | } |
1001 | } |
856 | } |
1002 | } |
857 | |
1003 | |
|
|
1004 | void |
858 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
1005 | connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
859 | { |
1006 | { |
860 | if (ictx && octx) |
1007 | if (ictx && octx) |
861 | send_vpn_packet (pkt, si, tos); |
1008 | send_vpn_packet (pkt, si, tos); |
862 | else |
1009 | else |
863 | { |
1010 | { |
864 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
1011 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
865 | |
1012 | post_inject_queue (); |
866 | establish_connection (); |
|
|
867 | } |
1013 | } |
868 | } |
1014 | } |
869 | |
1015 | |
870 | void |
1016 | void |
871 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
1017 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
872 | { |
1018 | { |
873 | last_activity = NOW; |
1019 | last_activity = ev_now (); |
874 | |
1020 | |
875 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
1021 | slog (L_NOISE, "%s >> received packet type %d from %d to %d.", |
876 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
1022 | conf->nodename, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
1023 | |
|
|
1024 | if (connectmode == conf_node::C_DISABLED) |
|
|
1025 | return; |
877 | |
1026 | |
878 | switch (pkt->typ ()) |
1027 | switch (pkt->typ ()) |
879 | { |
1028 | { |
880 | case vpn_packet::PT_PING: |
1029 | case vpn_packet::PT_PING: |
|
|
1030 | slog (L_TRACE, "%s >> PT_PING", conf->nodename); |
|
|
1031 | |
881 | // we send pings instead of auth packets after some retries, |
1032 | // we send pings instead of auth packets after some retries, |
882 | // so reset the retry counter and establish a connection |
1033 | // so reset the retry counter and establish a connection |
883 | // when we receive a ping. |
1034 | // when we receive a ping. |
884 | if (!ictx) |
1035 | if (!ictx) |
885 | { |
1036 | { |
886 | if (auth_rate_limiter.can (rsi)) |
1037 | if (auth_rate_limiter.can (rsi)) |
887 | send_auth_request (rsi, true); |
1038 | send_auth_request (rsi, true); |
888 | } |
1039 | } |
889 | else |
1040 | else |
|
|
1041 | // we would love to change the socket address here, but ping's aren't |
|
|
1042 | // authenticated, so we best ignore it. |
890 | send_ping (rsi, 1); // pong |
1043 | send_ping (rsi, 1); // pong |
891 | |
1044 | |
892 | break; |
1045 | break; |
893 | |
1046 | |
894 | case vpn_packet::PT_PONG: |
1047 | case vpn_packet::PT_PONG: |
|
|
1048 | slog (L_TRACE, "%s >> PT_PONG", conf->nodename); |
|
|
1049 | |
|
|
1050 | // a PONG might mean that the other side doesn't really know |
|
|
1051 | // about our desire for communication. |
|
|
1052 | establish_connection (); |
895 | break; |
1053 | break; |
896 | |
1054 | |
897 | case vpn_packet::PT_RESET: |
1055 | case vpn_packet::PT_RESET: |
898 | { |
1056 | { |
899 | reset_connection (); |
1057 | reset_connection (); |
900 | |
1058 | |
901 | config_packet *p = (config_packet *) pkt; |
1059 | config_packet *p = (config_packet *) pkt; |
902 | |
1060 | |
903 | if (!p->chk_config ()) |
1061 | if (!p->chk_config ()) |
904 | { |
1062 | { |
905 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
1063 | slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."), |
906 | conf->nodename, (const char *)rsi); |
1064 | conf->nodename, (const char *)rsi); |
907 | connectmode = conf_node::C_DISABLED; |
1065 | connectmode = conf_node::C_DISABLED; |
908 | } |
1066 | } |
909 | else if (connectmode == conf_node::C_ALWAYS) |
1067 | else if (connectmode == conf_node::C_ALWAYS) |
910 | establish_connection (); |
1068 | establish_connection (); |
… | |
… | |
912 | break; |
1070 | break; |
913 | |
1071 | |
914 | case vpn_packet::PT_AUTH_REQ: |
1072 | case vpn_packet::PT_AUTH_REQ: |
915 | if (auth_rate_limiter.can (rsi)) |
1073 | if (auth_rate_limiter.can (rsi)) |
916 | { |
1074 | { |
917 | auth_req_packet *p = (auth_req_packet *) pkt; |
1075 | auth_req_packet *p = (auth_req_packet *)pkt; |
918 | |
1076 | |
919 | slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
1077 | slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)", |
|
|
1078 | conf->nodename, p->initiate ? "initiate" : "reply", |
|
|
1079 | p->protocols, p->features); |
920 | |
1080 | |
921 | if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
1081 | if (p->chk_config () && !memcmp (p->magic, MAGIC, 8)) |
922 | { |
1082 | { |
923 | if (p->prot_minor != PROTOCOL_MINOR) |
1083 | if (p->prot_minor != PROTOCOL_MINOR) |
924 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
1084 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
925 | conf->nodename, (const char *)rsi, |
1085 | conf->nodename, (const char *)rsi, |
926 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1086 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
927 | |
1087 | |
928 | if (p->initiate) |
1088 | if (p->initiate) |
929 | send_auth_request (rsi, false); |
1089 | send_auth_request (rsi, false); |
930 | |
1090 | |
931 | rsachallenge k; |
1091 | auth_data auth; |
932 | |
1092 | |
933 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
1093 | if (!auth_decrypt (::conf.rsa_key, p->encr, auth)) |
934 | { |
1094 | { |
935 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
1095 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
936 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
1096 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
937 | break; |
|
|
938 | } |
1097 | } |
939 | else |
1098 | else |
940 | { |
1099 | { |
941 | delete octx; |
1100 | bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth); |
942 | |
1101 | |
943 | octx = new crypto_ctx (k, 1); |
1102 | rcv_auth = auth; |
944 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
1103 | have_rcv_auth = true; |
945 | |
1104 | |
|
|
1105 | send_auth_response (rsi); |
|
|
1106 | |
|
|
1107 | if (chg) |
|
|
1108 | { |
946 | conf->protocols = p->protocols; |
1109 | conf->protocols = p->protocols; |
947 | features = p->features & config_packet::get_features (); |
1110 | features = p->features & config_packet::get_features (); |
948 | |
1111 | |
949 | send_auth_response (rsi, p->id, k); |
|
|
950 | |
|
|
951 | connection_established (); |
1112 | connection_established (rsi); |
952 | |
|
|
953 | break; |
1113 | } |
954 | } |
1114 | } |
|
|
1115 | |
|
|
1116 | break; |
955 | } |
1117 | } |
956 | else |
1118 | else |
957 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
1119 | slog (L_WARN, _("%s(%s): protocol mismatch."), |
958 | conf->nodename, (const char *)rsi); |
1120 | conf->nodename, (const char *)rsi); |
959 | |
1121 | |
960 | send_reset (rsi); |
1122 | send_reset (rsi); |
961 | } |
1123 | } |
962 | |
1124 | |
963 | break; |
1125 | break; |
964 | |
1126 | |
965 | case vpn_packet::PT_AUTH_RES: |
1127 | case vpn_packet::PT_AUTH_RES: |
966 | { |
1128 | { |
967 | auth_res_packet *p = (auth_res_packet *) pkt; |
1129 | auth_res_packet *p = (auth_res_packet *)pkt; |
968 | |
1130 | |
969 | slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
1131 | slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename); |
970 | |
1132 | |
971 | if (p->chk_config ()) |
1133 | if (p->chk_config ()) |
972 | { |
1134 | { |
973 | if (p->prot_minor != PROTOCOL_MINOR) |
1135 | if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac))) |
974 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
975 | conf->nodename, (const char *)rsi, |
|
|
976 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
977 | |
|
|
978 | rsachallenge chg; |
|
|
979 | |
|
|
980 | if (!rsa_cache.find (p->id, chg)) |
|
|
981 | { |
1136 | { |
982 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
1137 | slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."), |
983 | conf->nodename, (const char *)rsi); |
1138 | conf->nodename, (const char *)rsi); |
984 | break; |
|
|
985 | } |
1139 | } |
986 | else |
1140 | else if (!have_snd_auth) |
987 | { |
1141 | { |
988 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1142 | if (p->prot_minor != PROTOCOL_MINOR) |
989 | |
1143 | slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
990 | if (!p->hmac_chk (cctx)) |
|
|
991 | { |
|
|
992 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
|
|
993 | "could be an attack, or just corruption or a synchronization error"), |
|
|
994 | conf->nodename, (const char *)rsi); |
1144 | conf->nodename, (const char *)rsi, |
995 | break; |
1145 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
996 | } |
|
|
997 | else |
|
|
998 | { |
|
|
999 | rsaresponse h; |
|
|
1000 | |
1146 | |
1001 | rsa_hash (p->id, chg, h); |
|
|
1002 | |
|
|
1003 | if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
|
|
1004 | { |
|
|
1005 | prot_minor = p->prot_minor; |
1147 | prot_minor = p->prot_minor; |
|
|
1148 | memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b)); |
1006 | |
1149 | |
1007 | delete ictx; ictx = cctx; |
1150 | have_snd_auth = true; |
1008 | |
|
|
1009 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
|
|
1010 | |
|
|
1011 | si = rsi; |
|
|
1012 | protocol = rsi.prot; |
|
|
1013 | |
|
|
1014 | connection_established (); |
1151 | connection_established (rsi); |
1015 | |
|
|
1016 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
|
|
1017 | conf->nodename, (const char *)rsi, |
|
|
1018 | p->prot_major, p->prot_minor); |
|
|
1019 | |
|
|
1020 | if (::conf.script_node_up) |
|
|
1021 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
|
|
1022 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
|
|
1023 | |
|
|
1024 | break; |
|
|
1025 | } |
|
|
1026 | else |
|
|
1027 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
|
|
1028 | conf->nodename, (const char *)rsi); |
|
|
1029 | } |
|
|
1030 | |
|
|
1031 | delete cctx; |
|
|
1032 | } |
1152 | } |
|
|
1153 | |
|
|
1154 | break; |
1033 | } |
1155 | } |
1034 | } |
1156 | } |
1035 | |
1157 | |
1036 | send_reset (rsi); |
1158 | send_reset (rsi); |
1037 | break; |
1159 | break; |
… | |
… | |
1048 | { |
1170 | { |
1049 | vpndata_packet *p = (vpndata_packet *)pkt; |
1171 | vpndata_packet *p = (vpndata_packet *)pkt; |
1050 | |
1172 | |
1051 | if (!p->hmac_chk (ictx)) |
1173 | if (!p->hmac_chk (ictx)) |
1052 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1174 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1053 | "could be an attack, or just corruption or a synchronization error"), |
1175 | "could be an attack, or just corruption or a synchronization error."), |
1054 | conf->nodename, (const char *)rsi); |
1176 | conf->nodename, (const char *)rsi); |
1055 | else |
1177 | else |
1056 | { |
1178 | { |
1057 | u32 seqno; |
1179 | u32 seqno; |
1058 | tap_packet *d = p->unpack (this, seqno); |
1180 | tap_packet *d = p->unpack (this, seqno); |
|
|
1181 | int seqclass = iseqno.seqno_classify (seqno); |
1059 | |
1182 | |
1060 | if (iseqno.recv_ok (seqno)) |
1183 | if (seqclass == 0) // ok |
1061 | { |
1184 | { |
1062 | vpn->tap->send (d); |
1185 | vpn->tap->send (d); |
1063 | |
1186 | |
1064 | if (si != rsi) |
1187 | if (si != rsi) |
1065 | { |
1188 | { |
1066 | // fast re-sync on source address changes, useful especially for tcp/ip |
1189 | // fast re-sync on source address changes, useful especially for tcp/ip |
|
|
1190 | //if (last_si_change < ev_now () + 5.) |
1067 | si = rsi; |
1191 | // { |
1068 | |
|
|
1069 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1192 | slog (L_INFO, _("%s(%s): changing socket address to %s."), |
1070 | conf->nodename, (const char *)si, (const char *)rsi); |
1193 | conf->nodename, (const char *)si, (const char *)rsi); |
|
|
1194 | |
|
|
1195 | si = rsi; |
|
|
1196 | |
|
|
1197 | if (::conf.script_node_change) |
|
|
1198 | { |
|
|
1199 | run_script_cb *cb = new run_script_cb; |
|
|
1200 | cb->set<connection, &connection::script_node_change> (this); |
|
|
1201 | run_script_queued (cb, _("node-change command execution failed, continuing.")); |
|
|
1202 | } |
|
|
1203 | |
|
|
1204 | // } |
|
|
1205 | //else |
|
|
1206 | // slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."), |
|
|
1207 | // conf->nodename, (const char *)si, (const char *)rsi); |
1071 | } |
1208 | } |
|
|
1209 | } |
|
|
1210 | else if (seqclass == 1) // far history |
|
|
1211 | slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). " |
|
|
1212 | "possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1); |
|
|
1213 | else if (seqclass == 2) // in-window duplicate, happens often on wireless |
|
|
1214 | slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). " |
|
|
1215 | "possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1); |
|
|
1216 | else if (seqclass == 3) // reset |
|
|
1217 | { |
|
|
1218 | slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). " |
|
|
1219 | "probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1); |
|
|
1220 | send_reset (rsi); |
1072 | } |
1221 | } |
1073 | |
1222 | |
1074 | delete d; |
1223 | delete d; |
1075 | break; |
1224 | break; |
1076 | } |
1225 | } |
… | |
… | |
1080 | break; |
1229 | break; |
1081 | |
1230 | |
1082 | case vpn_packet::PT_CONNECT_REQ: |
1231 | case vpn_packet::PT_CONNECT_REQ: |
1083 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1232 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1084 | { |
1233 | { |
1085 | connect_req_packet *p = (connect_req_packet *) pkt; |
1234 | connect_req_packet *p = (connect_req_packet *)pkt; |
1086 | |
1235 | |
1087 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1236 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1088 | { |
1237 | { |
1089 | connection *c = vpn->conns[p->id - 1]; |
1238 | connection *c = vpn->conns[p->id - 1]; |
1090 | conf->protocols = p->protocols; |
1239 | conf->protocols = p->protocols; |
1091 | |
1240 | |
1092 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1241 | slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]", |
|
|
1242 | conf->nodename, vpn->conns[p->id - 1]->conf->nodename, |
|
|
1243 | p->protocols, |
1093 | conf->id, p->id, c->ictx && c->octx); |
1244 | c->ictx && c->octx); |
1094 | |
1245 | |
1095 | if (c->ictx && c->octx) |
1246 | if (c->ictx && c->octx) |
1096 | { |
1247 | { |
1097 | // send connect_info packets to both sides, in case one is |
1248 | // send connect_info packets to both sides, in case one is |
1098 | // behind a nat firewall (or both ;) |
1249 | // behind a nat firewall (or both ;) |
… | |
… | |
1121 | |
1272 | |
1122 | c->conf->protocols = p->protocols; |
1273 | c->conf->protocols = p->protocols; |
1123 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1274 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1124 | p->si.upgrade_protocol (protocol, c->conf); |
1275 | p->si.upgrade_protocol (protocol, c->conf); |
1125 | |
1276 | |
1126 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1277 | slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]", |
1127 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1278 | conf->nodename, |
|
|
1279 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1280 | (const char *)p->si, |
|
|
1281 | p->protocols, |
|
|
1282 | protocol, |
|
|
1283 | p->si.supported_protocols (c->conf), |
|
|
1284 | !c->ictx && !c->octx); |
1128 | |
1285 | |
1129 | const sockinfo &dsi = forward_si (p->si); |
1286 | const sockinfo &dsi = forward_si (p->si); |
1130 | |
1287 | |
1131 | if (dsi.valid ()) |
1288 | if (dsi.valid ()) |
1132 | c->send_auth_request (dsi, true); |
1289 | c->send_auth_request (dsi, true); |
|
|
1290 | else |
|
|
1291 | slog (L_INFO, "connect info for %s received (%s), but still unable to contact.", |
|
|
1292 | vpn->conns[p->id - 1]->conf->nodename, |
|
|
1293 | (const char *)p->si); |
1133 | } |
1294 | } |
1134 | else |
1295 | else |
1135 | slog (L_WARN, |
1296 | slog (L_WARN, |
1136 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1297 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
1137 | p->id); |
1298 | p->id); |
… | |
… | |
1143 | send_reset (rsi); |
1304 | send_reset (rsi); |
1144 | break; |
1305 | break; |
1145 | } |
1306 | } |
1146 | } |
1307 | } |
1147 | |
1308 | |
1148 | void connection::keepalive_cb (time_watcher &w) |
1309 | inline void |
|
|
1310 | connection::keepalive_cb (ev::timer &w, int revents) |
1149 | { |
1311 | { |
1150 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1312 | ev_tstamp when = last_activity + ::conf.keepalive - ev::now (); |
|
|
1313 | |
|
|
1314 | if (when >= 0) |
|
|
1315 | w.start (when); |
|
|
1316 | else if (when < -15) |
1151 | { |
1317 | { |
1152 | reset_connection (); |
1318 | reset_connection (); |
1153 | establish_connection (); |
1319 | establish_connection (); |
1154 | } |
1320 | } |
1155 | else if (NOW < last_activity + ::conf.keepalive) |
|
|
1156 | w.start (last_activity + ::conf.keepalive); |
|
|
1157 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1321 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1158 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1322 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1159 | { |
1323 | { |
|
|
1324 | w.start (3); |
1160 | send_ping (si); |
1325 | send_ping (si); |
1161 | w.start (NOW + 5); |
|
|
1162 | } |
1326 | } |
1163 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1327 | else if (when >= -10) |
1164 | // hold ondemand connections implicitly a few seconds longer |
1328 | // hold ondemand connections implicitly a few seconds longer |
1165 | // should delete octx, though, or something like that ;) |
1329 | // should delete octx, though, or something like that ;) |
1166 | w.start (last_activity + ::conf.keepalive + 10); |
1330 | w.start (when + 10); |
1167 | else |
1331 | else |
1168 | reset_connection (); |
1332 | reset_connection (); |
1169 | } |
1333 | } |
1170 | |
1334 | |
|
|
1335 | void |
1171 | void connection::send_connect_request (int id) |
1336 | connection::send_connect_request (int id) |
1172 | { |
1337 | { |
1173 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1338 | connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols); |
1174 | |
1339 | |
1175 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1340 | slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)", |
|
|
1341 | conf->nodename, vpn->conns[id - 1]->conf->nodename, |
|
|
1342 | THISNODE->protocols); |
1176 | p->hmac_set (octx); |
1343 | p->hmac_set (octx); |
1177 | send_vpn_packet (p, si); |
1344 | send_vpn_packet (p, si); |
1178 | |
1345 | |
1179 | delete p; |
1346 | delete p; |
1180 | } |
1347 | } |
1181 | |
1348 | |
|
|
1349 | void |
1182 | void connection::script_init_env (const char *ext) |
1350 | connection::script_init_env (const char *ext) |
1183 | { |
1351 | { |
1184 | char *env; |
1352 | char *env; |
1185 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1353 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
1186 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1354 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
1187 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1355 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
1188 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1356 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
1189 | conf->id & 0xff); putenv (env); |
1357 | conf->id & 0xff); putenv (env); |
1190 | } |
1358 | } |
1191 | |
1359 | |
|
|
1360 | void |
1192 | void connection::script_init_connect_env () |
1361 | connection::script_init_connect_env () |
1193 | { |
1362 | { |
1194 | vpn->script_init_env (); |
1363 | vpn->script_init_env (); |
1195 | |
1364 | |
1196 | char *env; |
1365 | char *env; |
1197 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1366 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
|
|
1367 | asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env); |
1198 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1368 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1199 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1369 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1200 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1370 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1201 | } |
1371 | } |
1202 | |
1372 | |
|
|
1373 | inline const char * |
1203 | const char *connection::script_node_up () |
1374 | connection::script_node_up () |
1204 | { |
1375 | { |
1205 | script_init_connect_env (); |
1376 | script_init_connect_env (); |
1206 | |
1377 | |
1207 | putenv ("STATE=up"); |
1378 | putenv ((char *)"STATE=up"); |
1208 | |
1379 | |
1209 | char *filename; |
1380 | char *filename; |
1210 | asprintf (&filename, |
1381 | asprintf (&filename, |
1211 | "%s/%s", |
1382 | "%s/%s", |
1212 | confbase, |
1383 | confbase, |
1213 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1384 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
1214 | |
1385 | |
1215 | return filename; |
1386 | return filename; |
1216 | } |
1387 | } |
1217 | |
1388 | |
1218 | const char *connection::script_node_down () |
1389 | inline const char * |
|
|
1390 | connection::script_node_change () |
1219 | { |
1391 | { |
1220 | script_init_connect_env (); |
1392 | script_init_connect_env (); |
1221 | |
1393 | |
|
|
1394 | putenv ((char *)"STATE=change"); |
|
|
1395 | |
|
|
1396 | char *filename; |
|
|
1397 | asprintf (&filename, |
|
|
1398 | "%s/%s", |
|
|
1399 | confbase, |
|
|
1400 | ::conf.script_node_change ? ::conf.script_node_change : "node-change"); |
|
|
1401 | |
|
|
1402 | return filename; |
|
|
1403 | } |
|
|
1404 | |
|
|
1405 | inline const char * |
|
|
1406 | connection::script_node_down () |
|
|
1407 | { |
|
|
1408 | script_init_connect_env (); |
|
|
1409 | |
1222 | putenv ("STATE=down"); |
1410 | putenv ((char *)"STATE=down"); |
1223 | |
1411 | |
1224 | char *filename; |
1412 | char *filename; |
1225 | asprintf (&filename, |
1413 | asprintf (&filename, |
1226 | "%s/%s", |
1414 | "%s/%s", |
1227 | confbase, |
1415 | confbase, |
… | |
… | |
1229 | |
1417 | |
1230 | return filename; |
1418 | return filename; |
1231 | } |
1419 | } |
1232 | |
1420 | |
1233 | connection::connection (struct vpn *vpn, conf_node *conf) |
1421 | connection::connection (struct vpn *vpn, conf_node *conf) |
1234 | : vpn(vpn), conf(conf) |
1422 | : vpn(vpn), conf(conf), |
1235 | , rekey (this, &connection::rekey_cb) |
|
|
1236 | , keepalive (this, &connection::keepalive_cb) |
|
|
1237 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1238 | #if ENABLE_DNS |
1423 | #if ENABLE_DNS |
1239 | , dns (0) |
1424 | dns (0), |
1240 | #endif |
1425 | #endif |
|
|
1426 | data_queue(conf->max_ttl, conf->max_queue + 1), |
|
|
1427 | vpn_queue(conf->max_ttl, conf->max_queue + 1) |
1241 | { |
1428 | { |
|
|
1429 | rekey .set<connection, &connection::rekey_cb > (this); |
|
|
1430 | keepalive .set<connection, &connection::keepalive_cb > (this); |
|
|
1431 | establish_connection.set<connection, &connection::establish_connection_cb> (this); |
|
|
1432 | |
|
|
1433 | last_establish_attempt = 0.; |
1242 | octx = ictx = 0; |
1434 | octx = ictx = 0; |
1243 | retry_cnt = 0; |
|
|
1244 | |
1435 | |
1245 | if (!conf->protocols) // make sure some protocol is enabled |
1436 | connectmode = conf->connectmode; |
1246 | conf->protocols = PROT_UDPv4; |
|
|
1247 | |
1437 | |
1248 | connectmode = conf_node::C_ALWAYS; // initial setting |
1438 | // queue a dummy packet to force an initial connection attempt |
|
|
1439 | if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED) |
|
|
1440 | vpn_queue.put (new net_packet); |
|
|
1441 | |
1249 | reset_connection (); |
1442 | reset_connection (); |
1250 | } |
1443 | } |
1251 | |
1444 | |
1252 | connection::~connection () |
1445 | connection::~connection () |
1253 | { |
1446 | { |
1254 | shutdown (); |
1447 | shutdown (); |
1255 | } |
1448 | } |
1256 | |
1449 | |
|
|
1450 | void |
1257 | void connection_init () |
1451 | connection_init () |
1258 | { |
1452 | { |
1259 | auth_rate_limiter.clear (); |
1453 | auth_rate_limiter.clear (); |
1260 | reset_rate_limiter.clear (); |
1454 | reset_rate_limiter.clear (); |
1261 | } |
1455 | } |
1262 | |
1456 | |