1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
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3 | Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de> |
3 | |
4 | |
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5 | This file is part of GVPE. |
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6 | |
4 | This program is free software; you can redistribute it and/or modify |
7 | GVPE is free software; you can redistribute it and/or modify |
5 | it under the terms of the GNU General Public License as published by |
8 | it under the terms of the GNU General Public License as published by |
6 | the Free Software Foundation; either version 2 of the License, or |
9 | the Free Software Foundation; either version 2 of the License, or |
7 | (at your option) any later version. |
10 | (at your option) any later version. |
8 | |
11 | |
9 | This program is distributed in the hope that it will be useful, |
12 | This program is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 | GNU General Public License for more details. |
15 | GNU General Public License for more details. |
13 | |
16 | |
14 | You should have received a copy of the GNU General Public License |
17 | You should have received a copy of the GNU General Public License |
15 | along with this program; if not, write to the Free Software |
18 | along with gvpe; if not, write to the Free Software |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
19 | Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
17 | */ |
20 | */ |
18 | |
21 | |
19 | #include "config.h" |
22 | #include "config.h" |
20 | |
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21 | extern "C" { |
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22 | # include "lzf/lzf.h" |
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23 | } |
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24 | |
23 | |
25 | #include <list> |
24 | #include <list> |
26 | |
25 | |
27 | #include <openssl/rand.h> |
26 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
27 | #include <openssl/evp.h> |
29 | #include <openssl/rsa.h> |
28 | #include <openssl/rsa.h> |
30 | #include <openssl/err.h> |
29 | #include <openssl/err.h> |
31 | |
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32 | #include "gettext.h" |
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33 | |
30 | |
34 | #include "conf.h" |
31 | #include "conf.h" |
35 | #include "slog.h" |
32 | #include "slog.h" |
36 | #include "device.h" |
33 | #include "device.h" |
37 | #include "vpn.h" |
34 | #include "vpn.h" |
38 | #include "connection.h" |
35 | #include "connection.h" |
39 | |
36 | |
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37 | #include "netcompat.h" |
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38 | |
40 | #if !HAVE_RAND_PSEUDO_BYTES |
39 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | # define RAND_pseudo_bytes RAND_bytes |
40 | # define RAND_pseudo_bytes RAND_bytes |
42 | #endif |
41 | #endif |
43 | |
42 | |
44 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
43 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
45 | |
44 | |
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45 | #define ULTRA_FAST 1 |
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46 | #define HLOG 15 |
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47 | #include "lzf/lzf.h" |
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48 | #include "lzf/lzf_c.c" |
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49 | #include "lzf/lzf_d.c" |
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50 | |
46 | struct crypto_ctx |
51 | struct crypto_ctx |
47 | { |
52 | { |
48 | EVP_CIPHER_CTX cctx; |
53 | EVP_CIPHER_CTX cctx; |
49 | HMAC_CTX hctx; |
54 | HMAC_CTX hctx; |
50 | |
55 | |
… | |
… | |
53 | }; |
58 | }; |
54 | |
59 | |
55 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
56 | { |
61 | { |
57 | EVP_CIPHER_CTX_init (&cctx); |
62 | EVP_CIPHER_CTX_init (&cctx); |
58 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
63 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
59 | HMAC_CTX_init (&hctx); |
64 | HMAC_CTX_init (&hctx); |
60 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
61 | } |
66 | } |
62 | |
67 | |
63 | crypto_ctx::~crypto_ctx () |
68 | crypto_ctx::~crypto_ctx () |
64 | { |
69 | { |
65 | EVP_CIPHER_CTX_cleanup (&cctx); |
70 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
66 | HMAC_CTX_cleanup (&hctx); |
71 | HMAC_CTX_cleanup (&hctx); |
67 | } |
72 | } |
68 | |
73 | |
69 | static void |
74 | static void |
70 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
71 | { |
76 | { |
72 | EVP_MD_CTX ctx; |
77 | EVP_MD_CTX ctx; |
73 | |
78 | |
74 | EVP_MD_CTX_init (&ctx); |
79 | EVP_MD_CTX_init (&ctx); |
75 | EVP_DigestInit (&ctx, RSA_HASH); |
80 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
76 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
81 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
77 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
78 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
79 | EVP_MD_CTX_cleanup (&ctx); |
84 | EVP_MD_CTX_cleanup (&ctx); |
80 | } |
85 | } |
81 | |
86 | |
82 | struct rsa_entry { |
87 | struct rsa_entry |
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88 | { |
83 | tstamp expire; |
89 | tstamp expire; |
84 | rsaid id; |
90 | rsaid id; |
85 | rsachallenge chg; |
91 | rsachallenge chg; |
86 | }; |
92 | }; |
87 | |
93 | |
88 | struct rsa_cache : list<rsa_entry> |
94 | struct rsa_cache : list<rsa_entry> |
89 | { |
95 | { |
90 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
96 | void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner; |
91 | |
97 | |
92 | bool find (const rsaid &id, rsachallenge &chg) |
98 | bool find (const rsaid &id, rsachallenge &chg) |
93 | { |
99 | { |
94 | for (iterator i = begin (); i != end (); ++i) |
100 | for (iterator i = begin (); i != end (); ++i) |
95 | { |
101 | { |
96 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
102 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ()) |
97 | { |
103 | { |
98 | memcpy (&chg, &i->chg, sizeof chg); |
104 | memcpy (&chg, &i->chg, sizeof chg); |
99 | |
105 | |
100 | erase (i); |
106 | erase (i); |
101 | return true; |
107 | return true; |
102 | } |
108 | } |
103 | } |
109 | } |
104 | |
110 | |
105 | if (cleaner.at < NOW) |
111 | if (!cleaner.is_active ()) |
106 | cleaner.start (NOW + RSA_TTL); |
112 | cleaner.again (); |
107 | |
113 | |
108 | return false; |
114 | return false; |
109 | } |
115 | } |
110 | |
116 | |
111 | void gen (rsaid &id, rsachallenge &chg) |
117 | void gen (rsaid &id, rsachallenge &chg) |
112 | { |
118 | { |
113 | rsa_entry e; |
119 | rsa_entry e; |
114 | |
120 | |
115 | RAND_bytes ((unsigned char *)&id, sizeof id); |
121 | RAND_bytes ((unsigned char *)&id, sizeof id); |
116 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
122 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
117 | |
123 | |
118 | e.expire = NOW + RSA_TTL; |
124 | e.expire = ev_now () + RSA_TTL; |
119 | e.id = id; |
125 | e.id = id; |
120 | memcpy (&e.chg, &chg, sizeof chg); |
126 | memcpy (&e.chg, &chg, sizeof chg); |
121 | |
127 | |
122 | push_back (e); |
128 | push_back (e); |
123 | |
129 | |
124 | if (cleaner.at < NOW) |
130 | if (!cleaner.is_active ()) |
125 | cleaner.start (NOW + RSA_TTL); |
131 | cleaner.again (); |
126 | } |
132 | } |
127 | |
133 | |
128 | rsa_cache () |
134 | rsa_cache () |
129 | : cleaner (this, &rsa_cache::cleaner_cb) |
135 | : cleaner (this, &rsa_cache::cleaner_cb) |
130 | { } |
136 | { |
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137 | cleaner.set (RSA_TTL, RSA_TTL); |
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138 | } |
131 | |
139 | |
132 | } rsa_cache; |
140 | } rsa_cache; |
133 | |
141 | |
134 | void rsa_cache::cleaner_cb (time_watcher &w) |
142 | void rsa_cache::cleaner_cb (ev::timer &w, int revents) |
135 | { |
143 | { |
136 | if (empty ()) |
144 | if (empty ()) |
137 | w.at = TSTAMP_CANCEL; |
145 | w.stop (); |
138 | else |
146 | else |
139 | { |
147 | { |
140 | w.at = NOW + RSA_TTL; |
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141 | |
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142 | for (iterator i = begin (); i != end (); ) |
148 | for (iterator i = begin (); i != end (); ) |
143 | if (i->expire <= NOW) |
149 | if (i->expire <= ev_now ()) |
144 | i = erase (i); |
150 | i = erase (i); |
145 | else |
151 | else |
146 | ++i; |
152 | ++i; |
147 | } |
153 | } |
148 | } |
154 | } |
149 | |
155 | |
150 | ////////////////////////////////////////////////////////////////////////////// |
156 | ////////////////////////////////////////////////////////////////////////////// |
151 | |
157 | |
152 | void pkt_queue::put (tap_packet *p) |
158 | void pkt_queue::put (net_packet *p) |
153 | { |
159 | { |
154 | if (queue[i]) |
160 | if (queue[i]) |
155 | { |
161 | { |
156 | delete queue[i]; |
162 | delete queue[i]; |
157 | j = (j + 1) % QUEUEDEPTH; |
163 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
160 | queue[i] = p; |
166 | queue[i] = p; |
161 | |
167 | |
162 | i = (i + 1) % QUEUEDEPTH; |
168 | i = (i + 1) % QUEUEDEPTH; |
163 | } |
169 | } |
164 | |
170 | |
165 | tap_packet *pkt_queue::get () |
171 | net_packet *pkt_queue::get () |
166 | { |
172 | { |
167 | tap_packet *p = queue[j]; |
173 | net_packet *p = queue[j]; |
168 | |
174 | |
169 | if (p) |
175 | if (p) |
170 | { |
176 | { |
171 | queue[j] = 0; |
177 | queue[j] = 0; |
172 | j = (j + 1) % QUEUEDEPTH; |
178 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
186 | { |
192 | { |
187 | for (i = QUEUEDEPTH; --i > 0; ) |
193 | for (i = QUEUEDEPTH; --i > 0; ) |
188 | delete queue[i]; |
194 | delete queue[i]; |
189 | } |
195 | } |
190 | |
196 | |
191 | struct net_rateinfo { |
197 | struct net_rateinfo |
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198 | { |
192 | u32 host; |
199 | u32 host; |
193 | double pcnt, diff; |
200 | double pcnt, diff; |
194 | tstamp last; |
201 | tstamp last; |
195 | }; |
202 | }; |
196 | |
203 | |
197 | // only do action once every x seconds per host whole allowing bursts. |
204 | // only do action once every x seconds per host whole allowing bursts. |
198 | // this implementation ("splay list" ;) is inefficient, |
205 | // this implementation ("splay list" ;) is inefficient, |
199 | // but low on resources. |
206 | // but low on resources. |
200 | struct net_rate_limiter : list<net_rateinfo> |
207 | struct net_rate_limiter : list<net_rateinfo> |
201 | { |
208 | { |
202 | static const double ALPHA = 1. - 1. / 180.; // allow bursts |
209 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
203 | static const double CUTOFF = 10.; // one event every CUTOFF seconds |
210 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
204 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
211 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
205 | static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
212 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
206 | |
213 | |
207 | bool can (const sockinfo &si) { return can((u32)si.host); } |
214 | bool can (const sockinfo &si) { return can((u32)si.host); } |
208 | bool can (u32 host); |
215 | bool can (u32 host); |
209 | }; |
216 | }; |
210 | |
217 | |
211 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
218 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
212 | |
219 | |
… | |
… | |
215 | iterator i; |
222 | iterator i; |
216 | |
223 | |
217 | for (i = begin (); i != end (); ) |
224 | for (i = begin (); i != end (); ) |
218 | if (i->host == host) |
225 | if (i->host == host) |
219 | break; |
226 | break; |
220 | else if (i->last < NOW - EXPIRE) |
227 | else if (i->last < ev_now () - NRL_EXPIRE) |
221 | i = erase (i); |
228 | i = erase (i); |
222 | else |
229 | else |
223 | i++; |
230 | i++; |
224 | |
231 | |
225 | if (i == end ()) |
232 | if (i == end ()) |
226 | { |
233 | { |
227 | net_rateinfo ri; |
234 | net_rateinfo ri; |
228 | |
235 | |
229 | ri.host = host; |
236 | ri.host = host; |
230 | ri.pcnt = 1.; |
237 | ri.pcnt = 1.; |
231 | ri.diff = MAXDIF; |
238 | ri.diff = NRL_MAXDIF; |
232 | ri.last = NOW; |
239 | ri.last = ev_now (); |
233 | |
240 | |
234 | push_front (ri); |
241 | push_front (ri); |
235 | |
242 | |
236 | return true; |
243 | return true; |
237 | } |
244 | } |
238 | else |
245 | else |
239 | { |
246 | { |
240 | net_rateinfo ri (*i); |
247 | net_rateinfo ri (*i); |
241 | erase (i); |
248 | erase (i); |
242 | |
249 | |
243 | ri.pcnt = ri.pcnt * ALPHA; |
250 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
244 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
251 | ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last); |
245 | |
252 | |
246 | ri.last = NOW; |
253 | ri.last = ev_now (); |
247 | |
254 | |
248 | double dif = ri.diff / ri.pcnt; |
255 | double dif = ri.diff / ri.pcnt; |
249 | |
256 | |
250 | bool send = dif > CUTOFF; |
257 | bool send = dif > NRL_CUTOFF; |
251 | |
258 | |
252 | if (dif > MAXDIF) |
259 | if (dif > NRL_MAXDIF) |
253 | { |
260 | { |
254 | ri.pcnt = 1.; |
261 | ri.pcnt = 1.; |
255 | ri.diff = MAXDIF; |
262 | ri.diff = NRL_MAXDIF; |
256 | } |
263 | } |
257 | else if (send) |
264 | else if (send) |
258 | ri.pcnt++; |
265 | ri.pcnt++; |
259 | |
266 | |
260 | push_front (ri); |
267 | push_front (ri); |
… | |
… | |
307 | } |
314 | } |
308 | |
315 | |
309 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
316 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
310 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
317 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
311 | |
318 | |
312 | struct vpndata_packet:vpn_packet |
319 | struct vpndata_packet : vpn_packet |
313 | { |
320 | { |
314 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
321 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
315 | |
322 | |
316 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
323 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
317 | tap_packet *unpack (connection *conn, u32 &seqno); |
324 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
330 | int outl = 0, outl2; |
337 | int outl = 0, outl2; |
331 | ptype type = PT_DATA_UNCOMPRESSED; |
338 | ptype type = PT_DATA_UNCOMPRESSED; |
332 | |
339 | |
333 | #if ENABLE_COMPRESSION |
340 | #if ENABLE_COMPRESSION |
334 | u8 cdata[MAX_MTU]; |
341 | u8 cdata[MAX_MTU]; |
335 | u32 cl; |
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336 | |
342 | |
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343 | if (conn->features & ENABLE_COMPRESSION) |
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|
344 | { |
337 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
345 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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|
346 | |
338 | if (cl) |
347 | if (cl) |
339 | { |
348 | { |
340 | type = PT_DATA_COMPRESSED; |
349 | type = PT_DATA_COMPRESSED; |
341 | d = cdata; |
350 | d = cdata; |
342 | l = cl + 2; |
351 | l = cl + 2; |
343 | |
352 | |
344 | d[0] = cl >> 8; |
353 | d[0] = cl >> 8; |
345 | d[1] = cl; |
354 | d[1] = cl; |
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|
355 | } |
346 | } |
356 | } |
347 | #endif |
357 | #endif |
348 | |
358 | |
349 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
359 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
350 | |
360 | |
351 | struct { |
361 | struct { |
352 | #if RAND_SIZE |
362 | #if RAND_SIZE |
353 | u8 rnd[RAND_SIZE]; |
363 | u8 rnd[RAND_SIZE]; |
354 | #endif |
364 | #endif |
… | |
… | |
358 | datahdr.seqno = ntohl (seqno); |
368 | datahdr.seqno = ntohl (seqno); |
359 | #if RAND_SIZE |
369 | #if RAND_SIZE |
360 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
370 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
361 | #endif |
371 | #endif |
362 | |
372 | |
363 | EVP_EncryptUpdate (cctx, |
373 | require (EVP_EncryptUpdate (cctx, |
364 | (unsigned char *) data + outl, &outl2, |
374 | (unsigned char *) data + outl, &outl2, |
365 | (unsigned char *) &datahdr, DATAHDR); |
375 | (unsigned char *) &datahdr, DATAHDR)); |
366 | outl += outl2; |
376 | outl += outl2; |
367 | |
377 | |
368 | EVP_EncryptUpdate (cctx, |
378 | require (EVP_EncryptUpdate (cctx, |
369 | (unsigned char *) data + outl, &outl2, |
379 | (unsigned char *) data + outl, &outl2, |
370 | (unsigned char *) d, l); |
380 | (unsigned char *) d, l)); |
371 | outl += outl2; |
381 | outl += outl2; |
372 | |
382 | |
373 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
383 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
374 | outl += outl2; |
384 | outl += outl2; |
375 | |
385 | |
376 | len = outl + data_hdr_size (); |
386 | len = outl + data_hdr_size (); |
377 | |
387 | |
378 | set_hdr (type, dst); |
388 | set_hdr (type, dst); |
… | |
… | |
387 | int outl = 0, outl2; |
397 | int outl = 0, outl2; |
388 | tap_packet *p = new tap_packet; |
398 | tap_packet *p = new tap_packet; |
389 | u8 *d; |
399 | u8 *d; |
390 | u32 l = len - data_hdr_size (); |
400 | u32 l = len - data_hdr_size (); |
391 | |
401 | |
392 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
402 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
393 | |
403 | |
394 | #if ENABLE_COMPRESSION |
404 | #if ENABLE_COMPRESSION |
395 | u8 cdata[MAX_MTU]; |
405 | u8 cdata[MAX_MTU]; |
396 | |
406 | |
397 | if (type == PT_DATA_COMPRESSED) |
407 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
399 | else |
409 | else |
400 | #endif |
410 | #endif |
401 | d = &(*p)[6 + 6 - DATAHDR]; |
411 | d = &(*p)[6 + 6 - DATAHDR]; |
402 | |
412 | |
403 | /* this overwrites part of the src mac, but we fix that later */ |
413 | /* this overwrites part of the src mac, but we fix that later */ |
404 | EVP_DecryptUpdate (cctx, |
414 | require (EVP_DecryptUpdate (cctx, |
405 | d, &outl2, |
415 | d, &outl2, |
406 | (unsigned char *)&data, len - data_hdr_size ()); |
416 | (unsigned char *)&data, len - data_hdr_size ())); |
407 | outl += outl2; |
417 | outl += outl2; |
408 | |
418 | |
409 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
419 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
410 | outl += outl2; |
420 | outl += outl2; |
411 | |
421 | |
412 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
422 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
413 | |
423 | |
414 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
424 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
443 | { |
453 | { |
444 | // actually, hmaclen cannot be checked because the hmac |
454 | // actually, hmaclen cannot be checked because the hmac |
445 | // field comes before this data, so peers with other |
455 | // field comes before this data, so peers with other |
446 | // hmacs simply will not work. |
456 | // hmacs simply will not work. |
447 | u8 prot_major, prot_minor, randsize, hmaclen; |
457 | u8 prot_major, prot_minor, randsize, hmaclen; |
448 | u8 flags, challengelen, pad2, pad3; |
458 | u8 flags, challengelen, features, pad3; |
449 | u32 cipher_nid, digest_nid, hmac_nid; |
459 | u32 cipher_nid, digest_nid, hmac_nid; |
450 | |
|
|
451 | const u8 curflags () const |
|
|
452 | { |
|
|
453 | return 0x80 |
|
|
454 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
455 | } |
|
|
456 | |
460 | |
457 | void setup (ptype type, int dst); |
461 | void setup (ptype type, int dst); |
458 | bool chk_config () const; |
462 | bool chk_config () const; |
|
|
463 | |
|
|
464 | static u8 get_features () |
|
|
465 | { |
|
|
466 | u8 f = 0; |
|
|
467 | #if ENABLE_COMPRESSION |
|
|
468 | f |= FEATURE_COMPRESSION; |
|
|
469 | #endif |
|
|
470 | #if ENABLE_ROHC |
|
|
471 | f |= FEATURE_ROHC; |
|
|
472 | #endif |
|
|
473 | #if ENABLE_BRIDGING |
|
|
474 | f |= FEATURE_BRIDGING; |
|
|
475 | #endif |
|
|
476 | return f; |
|
|
477 | } |
459 | }; |
478 | }; |
460 | |
479 | |
461 | void config_packet::setup (ptype type, int dst) |
480 | void config_packet::setup (ptype type, int dst) |
462 | { |
481 | { |
463 | prot_major = PROTOCOL_MAJOR; |
482 | prot_major = PROTOCOL_MAJOR; |
464 | prot_minor = PROTOCOL_MINOR; |
483 | prot_minor = PROTOCOL_MINOR; |
465 | randsize = RAND_SIZE; |
484 | randsize = RAND_SIZE; |
466 | hmaclen = HMACLENGTH; |
485 | hmaclen = HMACLENGTH; |
467 | flags = curflags (); |
486 | flags = 0; |
468 | challengelen = sizeof (rsachallenge); |
487 | challengelen = sizeof (rsachallenge); |
|
|
488 | features = get_features (); |
469 | |
489 | |
470 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
490 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
471 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
491 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
472 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
492 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
473 | |
493 | |
… | |
… | |
475 | set_hdr (type, dst); |
495 | set_hdr (type, dst); |
476 | } |
496 | } |
477 | |
497 | |
478 | bool config_packet::chk_config () const |
498 | bool config_packet::chk_config () const |
479 | { |
499 | { |
480 | return prot_major == PROTOCOL_MAJOR |
500 | if (prot_major != PROTOCOL_MAJOR) |
481 | && randsize == RAND_SIZE |
501 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
482 | && hmaclen == HMACLENGTH |
502 | else if (randsize != RAND_SIZE) |
483 | && flags == curflags () |
503 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
|
|
504 | else if (hmaclen != HMACLENGTH) |
|
|
505 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
484 | && challengelen == sizeof (rsachallenge) |
506 | else if (challengelen != sizeof (rsachallenge)) |
|
|
507 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
485 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
508 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
|
|
509 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
486 | && digest_nid == htonl (EVP_MD_type (RSA_HASH)) |
510 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
|
|
511 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
487 | && hmac_nid == htonl (EVP_MD_type (DIGEST)); |
512 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
|
|
513 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
|
|
514 | else |
|
|
515 | return true; |
|
|
516 | |
|
|
517 | return false; |
488 | } |
518 | } |
489 | |
519 | |
490 | struct auth_req_packet : config_packet |
520 | struct auth_req_packet : config_packet |
491 | { |
521 | { |
492 | char magic[8]; |
522 | char magic[8]; |
493 | u8 initiate; // false if this is just an automatic reply |
523 | u8 initiate; // false if this is just an automatic reply |
494 | u8 protocols; // supported protocols (will get patches on forward) |
524 | u8 protocols; // supported protocols (will be patched on forward) |
495 | u8 pad2, pad3; |
525 | u8 pad2, pad3; |
496 | rsaid id; |
526 | rsaid id; |
497 | rsaencrdata encr; |
527 | rsaencrdata encr; |
498 | |
528 | |
499 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
529 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
556 | ///////////////////////////////////////////////////////////////////////////// |
586 | ///////////////////////////////////////////////////////////////////////////// |
557 | |
587 | |
558 | void |
588 | void |
559 | connection::connection_established () |
589 | connection::connection_established () |
560 | { |
590 | { |
|
|
591 | slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx); |
|
|
592 | |
561 | if (ictx && octx) |
593 | if (ictx && octx) |
562 | { |
594 | { |
563 | connectmode = conf->connectmode; |
595 | connectmode = conf->connectmode; |
564 | |
596 | |
565 | rekey.start (NOW + ::conf.rekey); |
597 | // make sure rekeying timeouts are slightly asymmetric |
|
|
598 | ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0); |
|
|
599 | rekey.start (rekey_interval, rekey_interval); |
566 | keepalive.start (NOW + ::conf.keepalive); |
600 | keepalive.start (::conf.keepalive); |
567 | |
601 | |
568 | // send queued packets |
602 | // send queued packets |
569 | if (ictx && octx) |
603 | if (ictx && octx) |
|
|
604 | { |
570 | while (tap_packet *p = queue.get ()) |
605 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
571 | { |
606 | { |
572 | send_data_packet (p); |
607 | send_data_packet (p); |
573 | delete p; |
608 | delete p; |
574 | } |
609 | } |
|
|
610 | |
|
|
611 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
612 | { |
|
|
613 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
614 | delete p; |
|
|
615 | } |
|
|
616 | } |
575 | } |
617 | } |
576 | else |
618 | else |
577 | { |
619 | { |
578 | retry_cnt = 0; |
620 | retry_cnt = 0; |
579 | establish_connection.start (NOW + 5); |
621 | establish_connection.start (5); |
580 | keepalive.reset (); |
622 | keepalive.stop (); |
581 | rekey.reset (); |
623 | rekey.stop (); |
582 | } |
624 | } |
583 | } |
625 | } |
584 | |
626 | |
585 | void |
627 | void |
586 | connection::reset_si () |
628 | connection::reset_si () |
… | |
… | |
588 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
630 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
589 | |
631 | |
590 | // mask out protocols we cannot establish |
632 | // mask out protocols we cannot establish |
591 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
633 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
592 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
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 | { |
|
|
641 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
|
|
642 | protocol = 0; |
|
|
643 | } |
593 | |
644 | |
594 | si.set (conf, protocol); |
645 | si.set (conf, protocol); |
595 | } |
646 | } |
596 | |
647 | |
597 | // ensure sockinfo is valid, forward if necessary |
648 | // ensure sockinfo is valid, forward if necessary |
… | |
… | |
602 | { |
653 | { |
603 | connection *r = vpn->find_router (); |
654 | connection *r = vpn->find_router (); |
604 | |
655 | |
605 | if (r) |
656 | if (r) |
606 | { |
657 | { |
607 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
658 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
608 | conf->nodename, r->conf->nodename); |
659 | conf->nodename, r->conf->nodename, (const char *)r->si); |
609 | return r->si; |
660 | return r->si; |
610 | } |
661 | } |
611 | else |
662 | else |
612 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
663 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
613 | conf->nodename); |
664 | conf->nodename); |
… | |
… | |
652 | connection::send_auth_request (const sockinfo &si, bool initiate) |
703 | connection::send_auth_request (const sockinfo &si, bool initiate) |
653 | { |
704 | { |
654 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
705 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
655 | |
706 | |
656 | rsachallenge chg; |
707 | rsachallenge chg; |
657 | |
|
|
658 | rsa_cache.gen (pkt->id, chg); |
708 | rsa_cache.gen (pkt->id, chg); |
659 | |
709 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
660 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
661 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
662 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
663 | fatal ("RSA_public_encrypt error"); |
|
|
664 | |
710 | |
665 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
711 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
666 | |
712 | |
667 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
713 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
668 | |
714 | |
… | |
… | |
688 | } |
734 | } |
689 | |
735 | |
690 | void |
736 | void |
691 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
737 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
692 | { |
738 | { |
693 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
739 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
694 | conf->id, rid, (const char *)rsi); |
740 | conf->id, rid, (const char *)rsi); |
695 | |
741 | |
696 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
742 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
697 | |
743 | |
698 | r->hmac_set (octx); |
744 | r->hmac_set (octx); |
… | |
… | |
700 | |
746 | |
701 | delete r; |
747 | delete r; |
702 | } |
748 | } |
703 | |
749 | |
704 | void |
750 | void |
705 | connection::establish_connection_cb (time_watcher &w) |
751 | connection::establish_connection_cb (ev::timer &w, int revents) |
706 | { |
752 | { |
707 | if (ictx || conf == THISNODE |
753 | if (!ictx |
|
|
754 | && conf != THISNODE |
708 | || connectmode == conf_node::C_NEVER |
755 | && connectmode != conf_node::C_NEVER |
709 | || connectmode == conf_node::C_DISABLED) |
756 | && connectmode != conf_node::C_DISABLED |
710 | w.at = TSTAMP_CANCEL; |
757 | && !w.is_active ()) |
711 | else if (w.at <= NOW) |
|
|
712 | { |
758 | { |
713 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
759 | ev::tstamp retry_int = ev::tstamp (retry_cnt & 3 |
714 | |
760 | ? (retry_cnt & 3) + 1 |
715 | if (retry_int < 3600 * 8) |
761 | : 1 << (retry_cnt >> 2)); |
716 | retry_cnt++; |
|
|
717 | |
|
|
718 | w.at = NOW + retry_int; |
|
|
719 | |
762 | |
720 | reset_si (); |
763 | reset_si (); |
721 | |
764 | |
|
|
765 | bool slow = si.prot & PROT_SLOW; |
|
|
766 | |
722 | if (si.prot && !si.host) |
767 | if (si.prot && !si.host) |
|
|
768 | { |
|
|
769 | slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename); |
|
|
770 | /*TODO*/ /* start the timer so we don't recurse endlessly */ |
|
|
771 | w.start (1); |
723 | vpn->send_connect_request (conf->id); |
772 | vpn->send_connect_request (conf->id); |
|
|
773 | } |
724 | else |
774 | else |
725 | { |
775 | { |
|
|
776 | slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx); |
|
|
777 | |
726 | const sockinfo &dsi = forward_si (si); |
778 | const sockinfo &dsi = forward_si (si); |
|
|
779 | |
|
|
780 | slow = slow || (dsi.prot & PROT_SLOW); |
727 | |
781 | |
728 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
782 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
729 | { |
783 | { |
730 | if (retry_cnt < 4) |
784 | if (retry_cnt < 4) |
731 | send_auth_request (dsi, true); |
785 | send_auth_request (dsi, true); |
732 | else |
786 | else |
733 | send_ping (dsi, 0); |
787 | send_ping (dsi, 0); |
734 | } |
788 | } |
735 | } |
789 | } |
|
|
790 | |
|
|
791 | retry_int *= slow ? 8. : 0.7; |
|
|
792 | |
|
|
793 | if (retry_int < conf->max_retry) |
|
|
794 | retry_cnt++; |
|
|
795 | else |
|
|
796 | retry_int = conf->max_retry; |
|
|
797 | |
|
|
798 | w.start (retry_int); |
736 | } |
799 | } |
737 | } |
800 | } |
738 | |
801 | |
739 | void |
802 | void |
740 | connection::reset_connection () |
803 | connection::reset_connection () |
… | |
… | |
743 | { |
806 | { |
744 | slog (L_INFO, _("%s(%s): connection lost"), |
807 | slog (L_INFO, _("%s(%s): connection lost"), |
745 | conf->nodename, (const char *)si); |
808 | conf->nodename, (const char *)si); |
746 | |
809 | |
747 | if (::conf.script_node_down) |
810 | if (::conf.script_node_down) |
748 | run_script (run_script_cb (this, &connection::script_node_down), false); |
811 | if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
|
|
812 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
749 | } |
813 | } |
750 | |
814 | |
751 | delete ictx; ictx = 0; |
815 | delete ictx; ictx = 0; |
752 | delete octx; octx = 0; |
816 | delete octx; octx = 0; |
|
|
817 | #if ENABLE_DNS |
|
|
818 | dnsv4_reset_connection (); |
|
|
819 | #endif |
753 | |
820 | |
754 | si.host= 0; |
821 | si.host = 0; |
755 | |
822 | |
756 | last_activity = 0; |
823 | last_activity = 0; |
757 | retry_cnt = 0; |
824 | retry_cnt = 0; |
758 | |
825 | |
759 | rekey.reset (); |
826 | rekey.stop (); |
760 | keepalive.reset (); |
827 | keepalive.stop (); |
761 | establish_connection.reset (); |
828 | establish_connection.stop (); |
762 | } |
829 | } |
763 | |
830 | |
764 | void |
831 | void |
765 | connection::shutdown () |
832 | connection::shutdown () |
766 | { |
833 | { |
… | |
… | |
769 | |
836 | |
770 | reset_connection (); |
837 | reset_connection (); |
771 | } |
838 | } |
772 | |
839 | |
773 | void |
840 | void |
774 | connection::rekey_cb (time_watcher &w) |
841 | connection::rekey_cb (ev::timer &w, int revents) |
775 | { |
842 | { |
776 | w.at = TSTAMP_CANCEL; |
|
|
777 | |
|
|
778 | reset_connection (); |
843 | reset_connection (); |
779 | establish_connection (); |
844 | establish_connection (); |
780 | } |
845 | } |
781 | |
846 | |
782 | void |
847 | void |
783 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
848 | connection::send_data_packet (tap_packet *pkt) |
784 | { |
849 | { |
785 | vpndata_packet *p = new vpndata_packet; |
850 | vpndata_packet *p = new vpndata_packet; |
786 | int tos = 0; |
851 | int tos = 0; |
787 | |
852 | |
788 | if (conf->inherit_tos |
853 | // I am not hilarious about peeking into packets, but so be it. |
789 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
854 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
790 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
791 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
855 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
792 | |
856 | |
793 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
857 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
794 | send_vpn_packet (p, si, tos); |
858 | send_vpn_packet (p, si, tos); |
795 | |
859 | |
796 | delete p; |
860 | delete p; |
797 | |
861 | |
798 | if (oseqno > MAX_SEQNO) |
862 | if (oseqno > MAX_SEQNO) |
799 | rekey (); |
863 | rekey (); |
800 | } |
864 | } |
801 | |
865 | |
802 | void |
866 | void |
803 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
867 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
804 | { |
868 | { |
805 | if (ictx && octx) |
869 | if (ictx && octx) |
806 | send_data_packet (pkt, broadcast); |
870 | send_data_packet (pkt); |
807 | else |
871 | else |
808 | { |
872 | { |
809 | if (!broadcast)//DDDD |
873 | if (!broadcast) |
810 | queue.put (new tap_packet (*pkt)); |
874 | data_queue.put (new tap_packet (*pkt)); |
811 | |
875 | |
812 | establish_connection (); |
876 | establish_connection (); |
813 | } |
877 | } |
814 | } |
878 | } |
815 | |
879 | |
816 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
880 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
817 | { |
881 | { |
818 | if (ictx && octx) |
882 | if (ictx && octx) |
819 | send_vpn_packet (pkt, si, tos); |
883 | send_vpn_packet (pkt, si, tos); |
820 | else |
884 | else |
|
|
885 | { |
|
|
886 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
|
|
887 | |
821 | establish_connection (); |
888 | establish_connection (); |
|
|
889 | } |
822 | } |
890 | } |
823 | |
891 | |
824 | void |
892 | void |
825 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
893 | connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
826 | { |
894 | { |
827 | last_activity = NOW; |
895 | last_activity = ev_now (); |
828 | |
896 | |
829 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
897 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
830 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
898 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
899 | |
|
|
900 | if (connectmode == conf_node::C_DISABLED) |
|
|
901 | return; |
831 | |
902 | |
832 | switch (pkt->typ ()) |
903 | switch (pkt->typ ()) |
833 | { |
904 | { |
834 | case vpn_packet::PT_PING: |
905 | case vpn_packet::PT_PING: |
835 | // we send pings instead of auth packets after some retries, |
906 | // we send pings instead of auth packets after some retries, |
… | |
… | |
882 | if (p->initiate) |
953 | if (p->initiate) |
883 | send_auth_request (rsi, false); |
954 | send_auth_request (rsi, false); |
884 | |
955 | |
885 | rsachallenge k; |
956 | rsachallenge k; |
886 | |
957 | |
887 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
958 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
888 | (unsigned char *)&p->encr, (unsigned char *)&k, |
959 | { |
889 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
890 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
960 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
891 | conf->nodename, (const char *)rsi); |
961 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
962 | break; |
|
|
963 | } |
892 | else |
964 | else |
893 | { |
965 | { |
894 | delete octx; |
966 | delete octx; |
895 | |
967 | |
896 | octx = new crypto_ctx (k, 1); |
968 | octx = new crypto_ctx (k, 1); |
897 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
969 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
898 | |
970 | |
899 | conf->protocols = p->protocols; |
971 | conf->protocols = p->protocols; |
|
|
972 | features = p->features & config_packet::get_features (); |
900 | |
973 | |
901 | send_auth_response (rsi, p->id, k); |
974 | send_auth_response (rsi, p->id, k); |
902 | |
975 | |
903 | connection_established (); |
976 | connection_established (); |
904 | |
977 | |
905 | break; |
978 | break; |
906 | } |
979 | } |
907 | } |
980 | } |
|
|
981 | else |
|
|
982 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
|
|
983 | conf->nodename, (const char *)rsi); |
908 | |
984 | |
909 | send_reset (rsi); |
985 | send_reset (rsi); |
910 | } |
986 | } |
911 | |
987 | |
912 | break; |
988 | break; |
… | |
… | |
925 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
1001 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
926 | |
1002 | |
927 | rsachallenge chg; |
1003 | rsachallenge chg; |
928 | |
1004 | |
929 | if (!rsa_cache.find (p->id, chg)) |
1005 | if (!rsa_cache.find (p->id, chg)) |
|
|
1006 | { |
930 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
1007 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
931 | conf->nodename, (const char *)rsi); |
1008 | conf->nodename, (const char *)rsi); |
|
|
1009 | break; |
|
|
1010 | } |
932 | else |
1011 | else |
933 | { |
1012 | { |
934 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
1013 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
935 | |
1014 | |
936 | if (!p->hmac_chk (cctx)) |
1015 | if (!p->hmac_chk (cctx)) |
|
|
1016 | { |
937 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1017 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
938 | "could be an attack, or just corruption or an synchronization error"), |
1018 | "could be an attack, or just corruption or a synchronization error"), |
939 | conf->nodename, (const char *)rsi); |
1019 | conf->nodename, (const char *)rsi); |
|
|
1020 | break; |
|
|
1021 | } |
940 | else |
1022 | else |
941 | { |
1023 | { |
942 | rsaresponse h; |
1024 | rsaresponse h; |
943 | |
1025 | |
944 | rsa_hash (p->id, chg, h); |
1026 | rsa_hash (p->id, chg, h); |
… | |
… | |
959 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1041 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
960 | conf->nodename, (const char *)rsi, |
1042 | conf->nodename, (const char *)rsi, |
961 | p->prot_major, p->prot_minor); |
1043 | p->prot_major, p->prot_minor); |
962 | |
1044 | |
963 | if (::conf.script_node_up) |
1045 | if (::conf.script_node_up) |
964 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1046 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
|
|
1047 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
965 | |
1048 | |
966 | break; |
1049 | break; |
967 | } |
1050 | } |
968 | else |
1051 | else |
969 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1052 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
990 | { |
1073 | { |
991 | vpndata_packet *p = (vpndata_packet *)pkt; |
1074 | vpndata_packet *p = (vpndata_packet *)pkt; |
992 | |
1075 | |
993 | if (!p->hmac_chk (ictx)) |
1076 | if (!p->hmac_chk (ictx)) |
994 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1077 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
995 | "could be an attack, or just corruption or an synchronization error"), |
1078 | "could be an attack, or just corruption or a synchronization error"), |
996 | conf->nodename, (const char *)rsi); |
1079 | conf->nodename, (const char *)rsi); |
997 | else |
1080 | else |
998 | { |
1081 | { |
999 | u32 seqno; |
1082 | u32 seqno; |
1000 | tap_packet *d = p->unpack (this, seqno); |
1083 | tap_packet *d = p->unpack (this, seqno); |
1001 | |
1084 | |
1002 | if (iseqno.recv_ok (seqno)) |
1085 | if (iseqno.recv_ok (seqno)) |
1003 | { |
1086 | { |
1004 | vpn->tap->send (d); |
1087 | vpn->tap->send (d); |
1005 | |
1088 | |
1006 | if (p->dst () == 0) // re-broadcast |
|
|
1007 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
1008 | { |
|
|
1009 | connection *c = *i; |
|
|
1010 | |
|
|
1011 | if (c->conf != THISNODE && c->conf != conf) |
|
|
1012 | c->inject_data_packet (d); |
|
|
1013 | } |
|
|
1014 | |
|
|
1015 | if (si != rsi) |
1089 | if (si != rsi) |
1016 | { |
1090 | { |
1017 | // fast re-sync on conneciton changes, useful especially for tcp/ip |
1091 | // fast re-sync on source address changes, useful especially for tcp/ip |
1018 | si = rsi; |
1092 | si = rsi; |
1019 | |
1093 | |
1020 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1094 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1021 | conf->nodename, (const char *)si, (const char *)rsi); |
1095 | conf->nodename, (const char *)si, (const char *)rsi); |
1022 | } |
1096 | } |
1023 | |
|
|
1024 | delete d; |
|
|
1025 | |
|
|
1026 | break; |
|
|
1027 | } |
1097 | } |
|
|
1098 | |
|
|
1099 | delete d; |
|
|
1100 | break; |
1028 | } |
1101 | } |
1029 | } |
1102 | } |
1030 | |
1103 | |
1031 | send_reset (rsi); |
1104 | send_reset (rsi); |
1032 | break; |
1105 | break; |
… | |
… | |
1034 | case vpn_packet::PT_CONNECT_REQ: |
1107 | case vpn_packet::PT_CONNECT_REQ: |
1035 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1108 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1036 | { |
1109 | { |
1037 | connect_req_packet *p = (connect_req_packet *) pkt; |
1110 | connect_req_packet *p = (connect_req_packet *) pkt; |
1038 | |
1111 | |
1039 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1112 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1040 | connection *c = vpn->conns[p->id - 1]; |
|
|
1041 | conf->protocols = p->protocols; |
|
|
1042 | |
|
|
1043 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
1044 | conf->id, p->id, c->ictx && c->octx); |
|
|
1045 | |
|
|
1046 | if (c->ictx && c->octx) |
|
|
1047 | { |
1113 | { |
|
|
1114 | connection *c = vpn->conns[p->id - 1]; |
|
|
1115 | conf->protocols = p->protocols; |
|
|
1116 | |
|
|
1117 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
|
|
1118 | conf->id, p->id, c->ictx && c->octx); |
|
|
1119 | |
|
|
1120 | if (c->ictx && c->octx) |
|
|
1121 | { |
1048 | // send connect_info packets to both sides, in case one is |
1122 | // send connect_info packets to both sides, in case one is |
1049 | // behind a nat firewall (or both ;) |
1123 | // behind a nat firewall (or both ;) |
1050 | c->send_connect_info (conf->id, si, conf->protocols); |
1124 | c->send_connect_info (conf->id, si, conf->protocols); |
1051 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1125 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1126 | } |
|
|
1127 | else |
|
|
1128 | c->establish_connection (); |
1052 | } |
1129 | } |
1053 | else |
1130 | else |
1054 | c->establish_connection (); |
1131 | slog (L_WARN, |
|
|
1132 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1133 | p->id); |
1055 | } |
1134 | } |
1056 | |
1135 | |
1057 | break; |
1136 | break; |
1058 | |
1137 | |
1059 | case vpn_packet::PT_CONNECT_INFO: |
1138 | case vpn_packet::PT_CONNECT_INFO: |
1060 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1139 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1061 | { |
1140 | { |
1062 | connect_info_packet *p = (connect_info_packet *) pkt; |
1141 | connect_info_packet *p = (connect_info_packet *)pkt; |
1063 | |
1142 | |
1064 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1143 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1065 | |
1144 | { |
1066 | connection *c = vpn->conns[p->id - 1]; |
1145 | connection *c = vpn->conns[p->id - 1]; |
1067 | |
1146 | |
1068 | c->conf->protocols = p->protocols; |
1147 | c->conf->protocols = p->protocols; |
1069 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1148 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1070 | p->si.upgrade_protocol (protocol, c->conf); |
1149 | p->si.upgrade_protocol (protocol, c->conf); |
1071 | |
1150 | |
1072 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1151 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1073 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1152 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1074 | |
1153 | |
1075 | const sockinfo &dsi = forward_si (p->si); |
1154 | const sockinfo &dsi = forward_si (p->si); |
1076 | |
1155 | |
1077 | if (dsi.valid ()) |
1156 | if (dsi.valid ()) |
1078 | c->send_auth_request (dsi, true); |
1157 | c->send_auth_request (dsi, true); |
|
|
1158 | } |
|
|
1159 | else |
|
|
1160 | slog (L_WARN, |
|
|
1161 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1162 | p->id); |
1079 | } |
1163 | } |
1080 | |
1164 | |
1081 | break; |
1165 | break; |
1082 | |
1166 | |
1083 | default: |
1167 | default: |
1084 | send_reset (rsi); |
1168 | send_reset (rsi); |
1085 | break; |
1169 | break; |
1086 | } |
1170 | } |
1087 | } |
1171 | } |
1088 | |
1172 | |
1089 | void connection::keepalive_cb (time_watcher &w) |
1173 | void connection::keepalive_cb (ev::timer &w, int revents) |
1090 | { |
1174 | { |
1091 | if (NOW >= last_activity + ::conf.keepalive + 30) |
1175 | if (ev_now () >= last_activity + ::conf.keepalive + 30) |
1092 | { |
1176 | { |
1093 | reset_connection (); |
1177 | reset_connection (); |
1094 | establish_connection (); |
1178 | establish_connection (); |
1095 | } |
1179 | } |
1096 | else if (NOW < last_activity + ::conf.keepalive) |
1180 | else if (ev_now () < last_activity + ::conf.keepalive) |
1097 | w.at = last_activity + ::conf.keepalive; |
1181 | w.start (last_activity + ::conf.keepalive - ev::now ()); |
1098 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1182 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1099 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1183 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1100 | { |
1184 | { |
1101 | send_ping (si); |
1185 | send_ping (si); |
1102 | w.at = NOW + 5; |
1186 | w.start (5); |
1103 | } |
1187 | } |
|
|
1188 | else if (ev_now () < last_activity + ::conf.keepalive + 10) |
|
|
1189 | // hold ondemand connections implicitly a few seconds longer |
|
|
1190 | // should delete octx, though, or something like that ;) |
|
|
1191 | w.start (last_activity + ::conf.keepalive + 10 - ev::now ()); |
1104 | else |
1192 | else |
1105 | reset_connection (); |
1193 | reset_connection (); |
1106 | } |
1194 | } |
1107 | |
1195 | |
1108 | void connection::send_connect_request (int id) |
1196 | void connection::send_connect_request (int id) |
… | |
… | |
1114 | send_vpn_packet (p, si); |
1202 | send_vpn_packet (p, si); |
1115 | |
1203 | |
1116 | delete p; |
1204 | delete p; |
1117 | } |
1205 | } |
1118 | |
1206 | |
|
|
1207 | void connection::script_init_env (const char *ext) |
|
|
1208 | { |
|
|
1209 | char *env; |
|
|
1210 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1211 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1212 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1213 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1214 | conf->id & 0xff); putenv (env); |
|
|
1215 | } |
|
|
1216 | |
1119 | void connection::script_node () |
1217 | void connection::script_init_connect_env () |
1120 | { |
1218 | { |
1121 | vpn->script_if_up (); |
1219 | vpn->script_init_env (); |
1122 | |
1220 | |
1123 | char *env; |
1221 | char *env; |
1124 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1222 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1125 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1223 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1126 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1224 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1127 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1225 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1128 | } |
1226 | } |
1129 | |
1227 | |
1130 | const char *connection::script_node_up () |
1228 | const char *connection::script_node_up () |
1131 | { |
1229 | { |
1132 | script_node (); |
1230 | script_init_connect_env (); |
1133 | |
1231 | |
1134 | putenv ("STATE=up"); |
1232 | putenv ((char *)"STATE=up"); |
1135 | |
1233 | |
|
|
1234 | char *filename; |
|
|
1235 | asprintf (&filename, |
|
|
1236 | "%s/%s", |
|
|
1237 | confbase, |
1136 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1238 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
|
|
1239 | |
|
|
1240 | return filename; |
1137 | } |
1241 | } |
1138 | |
1242 | |
1139 | const char *connection::script_node_down () |
1243 | const char *connection::script_node_down () |
1140 | { |
1244 | { |
1141 | script_node (); |
1245 | script_init_connect_env (); |
1142 | |
1246 | |
1143 | putenv ("STATE=down"); |
1247 | putenv ((char *)"STATE=down"); |
1144 | |
1248 | |
1145 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1249 | char *filename; |
1146 | } |
1250 | asprintf (&filename, |
|
|
1251 | "%s/%s", |
|
|
1252 | confbase, |
|
|
1253 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1147 | |
1254 | |
|
|
1255 | return filename; |
|
|
1256 | } |
|
|
1257 | |
1148 | connection::connection(struct vpn *vpn_) |
1258 | connection::connection (struct vpn *vpn, conf_node *conf) |
1149 | : vpn(vpn_) |
1259 | : vpn(vpn), conf(conf) |
1150 | , rekey (this, &connection::rekey_cb) |
1260 | , rekey (this, &connection::rekey_cb) |
1151 | , keepalive (this, &connection::keepalive_cb) |
1261 | , keepalive (this, &connection::keepalive_cb) |
1152 | , establish_connection (this, &connection::establish_connection_cb) |
1262 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1263 | #if ENABLE_DNS |
|
|
1264 | , dns (0) |
|
|
1265 | #endif |
1153 | { |
1266 | { |
1154 | octx = ictx = 0; |
1267 | octx = ictx = 0; |
1155 | retry_cnt = 0; |
1268 | retry_cnt = 0; |
1156 | |
1269 | |
|
|
1270 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1271 | conf->protocols = PROT_UDPv4; |
|
|
1272 | |
1157 | connectmode = conf_node::C_ALWAYS; // initial setting |
1273 | connectmode = conf_node::C_ALWAYS; // initial setting |
1158 | reset_connection (); |
1274 | reset_connection (); |
1159 | } |
1275 | } |
1160 | |
1276 | |
1161 | connection::~connection () |
1277 | connection::~connection () |