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 { |
83 | tstamp expire; |
88 | tstamp expire; |
… | |
… | |
88 | struct rsa_cache : list<rsa_entry> |
93 | struct rsa_cache : list<rsa_entry> |
89 | { |
94 | { |
90 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
95 | void cleaner_cb (time_watcher &w); time_watcher cleaner; |
91 | |
96 | |
92 | bool find (const rsaid &id, rsachallenge &chg) |
97 | bool find (const rsaid &id, rsachallenge &chg) |
93 | { |
98 | { |
94 | for (iterator i = begin (); i != end (); ++i) |
99 | for (iterator i = begin (); i != end (); ++i) |
95 | { |
100 | { |
96 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
101 | if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
97 | { |
102 | { |
98 | memcpy (&chg, &i->chg, sizeof chg); |
103 | memcpy (&chg, &i->chg, sizeof chg); |
99 | |
104 | |
100 | erase (i); |
105 | erase (i); |
101 | return true; |
106 | return true; |
102 | } |
107 | } |
103 | } |
108 | } |
104 | |
109 | |
105 | if (cleaner.at < NOW) |
110 | if (cleaner.at < NOW) |
106 | cleaner.start (NOW + RSA_TTL); |
111 | cleaner.start (NOW + RSA_TTL); |
107 | |
112 | |
108 | return false; |
113 | return false; |
109 | } |
114 | } |
110 | |
115 | |
111 | void gen (rsaid &id, rsachallenge &chg) |
116 | void gen (rsaid &id, rsachallenge &chg) |
112 | { |
117 | { |
113 | rsa_entry e; |
118 | rsa_entry e; |
114 | |
119 | |
115 | RAND_bytes ((unsigned char *)&id, sizeof id); |
120 | RAND_bytes ((unsigned char *)&id, sizeof id); |
116 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
121 | RAND_bytes ((unsigned char *)&chg, sizeof chg); |
117 | |
122 | |
118 | e.expire = NOW + RSA_TTL; |
123 | e.expire = NOW + RSA_TTL; |
119 | e.id = id; |
124 | e.id = id; |
120 | memcpy (&e.chg, &chg, sizeof chg); |
125 | memcpy (&e.chg, &chg, sizeof chg); |
121 | |
126 | |
122 | push_back (e); |
127 | push_back (e); |
123 | |
128 | |
124 | if (cleaner.at < NOW) |
129 | if (cleaner.at < NOW) |
125 | cleaner.start (NOW + RSA_TTL); |
130 | cleaner.start (NOW + RSA_TTL); |
126 | } |
131 | } |
127 | |
132 | |
128 | rsa_cache () |
133 | rsa_cache () |
129 | : cleaner (this, &rsa_cache::cleaner_cb) |
134 | : cleaner (this, &rsa_cache::cleaner_cb) |
130 | { } |
135 | { } |
131 | |
136 | |
132 | } rsa_cache; |
137 | } rsa_cache; |
133 | |
138 | |
134 | void rsa_cache::cleaner_cb (time_watcher &w) |
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
135 | { |
140 | { |
136 | if (empty ()) |
141 | if (!empty ()) |
137 | w.at = TSTAMP_CANCEL; |
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138 | else |
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139 | { |
142 | { |
140 | w.at = NOW + RSA_TTL; |
143 | w.start (NOW + RSA_TTL); |
141 | |
144 | |
142 | for (iterator i = begin (); i != end (); ) |
145 | for (iterator i = begin (); i != end (); ) |
143 | if (i->expire <= NOW) |
146 | if (i->expire <= NOW) |
144 | i = erase (i); |
147 | i = erase (i); |
145 | else |
148 | else |
… | |
… | |
147 | } |
150 | } |
148 | } |
151 | } |
149 | |
152 | |
150 | ////////////////////////////////////////////////////////////////////////////// |
153 | ////////////////////////////////////////////////////////////////////////////// |
151 | |
154 | |
152 | void pkt_queue::put (tap_packet *p) |
155 | void pkt_queue::put (net_packet *p) |
153 | { |
156 | { |
154 | if (queue[i]) |
157 | if (queue[i]) |
155 | { |
158 | { |
156 | delete queue[i]; |
159 | delete queue[i]; |
157 | j = (j + 1) % QUEUEDEPTH; |
160 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
160 | queue[i] = p; |
163 | queue[i] = p; |
161 | |
164 | |
162 | i = (i + 1) % QUEUEDEPTH; |
165 | i = (i + 1) % QUEUEDEPTH; |
163 | } |
166 | } |
164 | |
167 | |
165 | tap_packet *pkt_queue::get () |
168 | net_packet *pkt_queue::get () |
166 | { |
169 | { |
167 | tap_packet *p = queue[j]; |
170 | net_packet *p = queue[j]; |
168 | |
171 | |
169 | if (p) |
172 | if (p) |
170 | { |
173 | { |
171 | queue[j] = 0; |
174 | queue[j] = 0; |
172 | j = (j + 1) % QUEUEDEPTH; |
175 | j = (j + 1) % QUEUEDEPTH; |
… | |
… | |
197 | // only do action once every x seconds per host whole allowing bursts. |
200 | // only do action once every x seconds per host whole allowing bursts. |
198 | // this implementation ("splay list" ;) is inefficient, |
201 | // this implementation ("splay list" ;) is inefficient, |
199 | // but low on resources. |
202 | // but low on resources. |
200 | struct net_rate_limiter : list<net_rateinfo> |
203 | struct net_rate_limiter : list<net_rateinfo> |
201 | { |
204 | { |
202 | static const double ALPHA = 1. - 1. / 90.; // allow bursts |
205 | # define NRL_ALPHA (1. - 1. / 600.) // allow bursts |
203 | static const double CUTOFF = 20.; // one event every CUTOFF seconds |
206 | # define NRL_CUTOFF 10. // one event every CUTOFF seconds |
204 | static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
207 | # define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time |
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208 | # define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value |
205 | |
209 | |
206 | bool can (const sockinfo &si) { return can((u32)si.host); } |
210 | bool can (const sockinfo &si) { return can((u32)si.host); } |
207 | bool can (u32 host); |
211 | bool can (u32 host); |
208 | }; |
212 | }; |
209 | |
213 | |
210 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
214 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
211 | |
215 | |
… | |
… | |
214 | iterator i; |
218 | iterator i; |
215 | |
219 | |
216 | for (i = begin (); i != end (); ) |
220 | for (i = begin (); i != end (); ) |
217 | if (i->host == host) |
221 | if (i->host == host) |
218 | break; |
222 | break; |
219 | else if (i->last < NOW - EXPIRE) |
223 | else if (i->last < NOW - NRL_EXPIRE) |
220 | i = erase (i); |
224 | i = erase (i); |
221 | else |
225 | else |
222 | i++; |
226 | i++; |
223 | |
227 | |
224 | if (i == end ()) |
228 | if (i == end ()) |
225 | { |
229 | { |
226 | net_rateinfo ri; |
230 | net_rateinfo ri; |
227 | |
231 | |
228 | ri.host = host; |
232 | ri.host = host; |
229 | ri.pcnt = 1.; |
233 | ri.pcnt = 1.; |
230 | ri.diff = CUTOFF * (1. / (1. - ALPHA)); |
234 | ri.diff = NRL_MAXDIF; |
231 | ri.last = NOW; |
235 | ri.last = NOW; |
232 | |
236 | |
233 | push_front (ri); |
237 | push_front (ri); |
234 | |
238 | |
235 | return true; |
239 | return true; |
… | |
… | |
237 | else |
241 | else |
238 | { |
242 | { |
239 | net_rateinfo ri (*i); |
243 | net_rateinfo ri (*i); |
240 | erase (i); |
244 | erase (i); |
241 | |
245 | |
242 | ri.pcnt = ri.pcnt * ALPHA; |
246 | ri.pcnt = ri.pcnt * NRL_ALPHA; |
243 | ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
247 | ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last); |
244 | |
248 | |
245 | ri.last = NOW; |
249 | ri.last = NOW; |
246 | |
250 | |
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251 | double dif = ri.diff / ri.pcnt; |
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252 | |
247 | bool send = ri.diff / ri.pcnt > CUTOFF; |
253 | bool send = dif > NRL_CUTOFF; |
248 | |
254 | |
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255 | if (dif > NRL_MAXDIF) |
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256 | { |
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257 | ri.pcnt = 1.; |
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258 | ri.diff = NRL_MAXDIF; |
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259 | } |
249 | if (send) |
260 | else if (send) |
250 | ri.pcnt++; |
261 | ri.pcnt++; |
251 | |
262 | |
252 | push_front (ri); |
263 | push_front (ri); |
253 | |
264 | |
254 | return send; |
265 | return send; |
… | |
… | |
285 | hmac_gen (ctx); |
296 | hmac_gen (ctx); |
286 | |
297 | |
287 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
298 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
288 | } |
299 | } |
289 | |
300 | |
290 | void vpn_packet::set_hdr (ptype type, unsigned int dst) |
301 | void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
291 | { |
302 | { |
292 | this->type = type; |
303 | type = type_; |
293 | |
304 | |
294 | int src = THISNODE->id; |
305 | int src = THISNODE->id; |
295 | |
306 | |
296 | src1 = src; |
307 | src1 = src; |
297 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
308 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
… | |
… | |
299 | } |
310 | } |
300 | |
311 | |
301 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
302 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
303 | |
314 | |
304 | struct vpndata_packet:vpn_packet |
315 | struct vpndata_packet : vpn_packet |
305 | { |
316 | { |
306 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
307 | |
318 | |
308 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
309 | tap_packet *unpack (connection *conn, u32 &seqno); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
322 | int outl = 0, outl2; |
333 | int outl = 0, outl2; |
323 | ptype type = PT_DATA_UNCOMPRESSED; |
334 | ptype type = PT_DATA_UNCOMPRESSED; |
324 | |
335 | |
325 | #if ENABLE_COMPRESSION |
336 | #if ENABLE_COMPRESSION |
326 | u8 cdata[MAX_MTU]; |
337 | u8 cdata[MAX_MTU]; |
327 | u32 cl; |
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328 | |
338 | |
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339 | if (conn->features & ENABLE_COMPRESSION) |
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|
340 | { |
329 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
341 | u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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|
342 | |
330 | if (cl) |
343 | if (cl) |
331 | { |
344 | { |
332 | type = PT_DATA_COMPRESSED; |
345 | type = PT_DATA_COMPRESSED; |
333 | d = cdata; |
346 | d = cdata; |
334 | l = cl + 2; |
347 | l = cl + 2; |
335 | |
348 | |
336 | d[0] = cl >> 8; |
349 | d[0] = cl >> 8; |
337 | d[1] = cl; |
350 | d[1] = cl; |
|
|
351 | } |
338 | } |
352 | } |
339 | #endif |
353 | #endif |
340 | |
354 | |
341 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
355 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
342 | |
356 | |
343 | struct { |
357 | struct { |
344 | #if RAND_SIZE |
358 | #if RAND_SIZE |
345 | u8 rnd[RAND_SIZE]; |
359 | u8 rnd[RAND_SIZE]; |
346 | #endif |
360 | #endif |
… | |
… | |
350 | datahdr.seqno = ntohl (seqno); |
364 | datahdr.seqno = ntohl (seqno); |
351 | #if RAND_SIZE |
365 | #if RAND_SIZE |
352 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
366 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
353 | #endif |
367 | #endif |
354 | |
368 | |
355 | EVP_EncryptUpdate (cctx, |
369 | require (EVP_EncryptUpdate (cctx, |
356 | (unsigned char *) data + outl, &outl2, |
370 | (unsigned char *) data + outl, &outl2, |
357 | (unsigned char *) &datahdr, DATAHDR); |
371 | (unsigned char *) &datahdr, DATAHDR)); |
358 | outl += outl2; |
372 | outl += outl2; |
359 | |
373 | |
360 | EVP_EncryptUpdate (cctx, |
374 | require (EVP_EncryptUpdate (cctx, |
361 | (unsigned char *) data + outl, &outl2, |
375 | (unsigned char *) data + outl, &outl2, |
362 | (unsigned char *) d, l); |
376 | (unsigned char *) d, l)); |
363 | outl += outl2; |
377 | outl += outl2; |
364 | |
378 | |
365 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
379 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
366 | outl += outl2; |
380 | outl += outl2; |
367 | |
381 | |
368 | len = outl + data_hdr_size (); |
382 | len = outl + data_hdr_size (); |
369 | |
383 | |
370 | set_hdr (type, dst); |
384 | set_hdr (type, dst); |
… | |
… | |
379 | int outl = 0, outl2; |
393 | int outl = 0, outl2; |
380 | tap_packet *p = new tap_packet; |
394 | tap_packet *p = new tap_packet; |
381 | u8 *d; |
395 | u8 *d; |
382 | u32 l = len - data_hdr_size (); |
396 | u32 l = len - data_hdr_size (); |
383 | |
397 | |
384 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
398 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
385 | |
399 | |
386 | #if ENABLE_COMPRESSION |
400 | #if ENABLE_COMPRESSION |
387 | u8 cdata[MAX_MTU]; |
401 | u8 cdata[MAX_MTU]; |
388 | |
402 | |
389 | if (type == PT_DATA_COMPRESSED) |
403 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
391 | else |
405 | else |
392 | #endif |
406 | #endif |
393 | d = &(*p)[6 + 6 - DATAHDR]; |
407 | d = &(*p)[6 + 6 - DATAHDR]; |
394 | |
408 | |
395 | /* this overwrites part of the src mac, but we fix that later */ |
409 | /* this overwrites part of the src mac, but we fix that later */ |
396 | EVP_DecryptUpdate (cctx, |
410 | require (EVP_DecryptUpdate (cctx, |
397 | d, &outl2, |
411 | d, &outl2, |
398 | (unsigned char *)&data, len - data_hdr_size ()); |
412 | (unsigned char *)&data, len - data_hdr_size ())); |
399 | outl += outl2; |
413 | outl += outl2; |
400 | |
414 | |
401 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
415 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
402 | outl += outl2; |
416 | outl += outl2; |
403 | |
417 | |
404 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
418 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
405 | |
419 | |
406 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
420 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
435 | { |
449 | { |
436 | // actually, hmaclen cannot be checked because the hmac |
450 | // actually, hmaclen cannot be checked because the hmac |
437 | // field comes before this data, so peers with other |
451 | // field comes before this data, so peers with other |
438 | // hmacs simply will not work. |
452 | // hmacs simply will not work. |
439 | u8 prot_major, prot_minor, randsize, hmaclen; |
453 | u8 prot_major, prot_minor, randsize, hmaclen; |
440 | u8 flags, challengelen, pad2, pad3; |
454 | u8 flags, challengelen, features, pad3; |
441 | u32 cipher_nid, digest_nid, hmac_nid; |
455 | u32 cipher_nid, digest_nid, hmac_nid; |
442 | |
|
|
443 | const u8 curflags () const |
|
|
444 | { |
|
|
445 | return 0x80 |
|
|
446 | | (ENABLE_COMPRESSION ? 0x01 : 0x00); |
|
|
447 | } |
|
|
448 | |
456 | |
449 | void setup (ptype type, int dst); |
457 | void setup (ptype type, int dst); |
450 | bool chk_config () const; |
458 | bool chk_config () const; |
|
|
459 | |
|
|
460 | static u8 get_features () |
|
|
461 | { |
|
|
462 | u8 f = 0; |
|
|
463 | #if ENABLE_COMPRESSION |
|
|
464 | f |= FEATURE_COMPRESSION; |
|
|
465 | #endif |
|
|
466 | #if ENABLE_ROHC |
|
|
467 | f |= FEATURE_ROHC; |
|
|
468 | #endif |
|
|
469 | #if ENABLE_BRIDGING |
|
|
470 | f |= FEATURE_BRIDGING; |
|
|
471 | #endif |
|
|
472 | return f; |
|
|
473 | } |
451 | }; |
474 | }; |
452 | |
475 | |
453 | void config_packet::setup (ptype type, int dst) |
476 | void config_packet::setup (ptype type, int dst) |
454 | { |
477 | { |
455 | prot_major = PROTOCOL_MAJOR; |
478 | prot_major = PROTOCOL_MAJOR; |
456 | prot_minor = PROTOCOL_MINOR; |
479 | prot_minor = PROTOCOL_MINOR; |
457 | randsize = RAND_SIZE; |
480 | randsize = RAND_SIZE; |
458 | hmaclen = HMACLENGTH; |
481 | hmaclen = HMACLENGTH; |
459 | flags = curflags (); |
482 | flags = 0; |
460 | challengelen = sizeof (rsachallenge); |
483 | challengelen = sizeof (rsachallenge); |
|
|
484 | features = get_features (); |
461 | |
485 | |
462 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
486 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
463 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
487 | digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
464 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
488 | hmac_nid = htonl (EVP_MD_type (DIGEST)); |
465 | |
489 | |
… | |
… | |
467 | set_hdr (type, dst); |
491 | set_hdr (type, dst); |
468 | } |
492 | } |
469 | |
493 | |
470 | bool config_packet::chk_config () const |
494 | bool config_packet::chk_config () const |
471 | { |
495 | { |
472 | return prot_major == PROTOCOL_MAJOR |
496 | if (prot_major != PROTOCOL_MAJOR) |
473 | && randsize == RAND_SIZE |
497 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
474 | && hmaclen == HMACLENGTH |
498 | else if (randsize != RAND_SIZE) |
475 | && flags == curflags () |
499 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
|
|
500 | else if (hmaclen != HMACLENGTH) |
|
|
501 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
476 | && challengelen == sizeof (rsachallenge) |
502 | else if (challengelen != sizeof (rsachallenge)) |
|
|
503 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
477 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
504 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
|
|
505 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
478 | && digest_nid == htonl (EVP_MD_type (RSA_HASH)) |
506 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
|
|
507 | slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
479 | && hmac_nid == htonl (EVP_MD_type (DIGEST)); |
508 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
|
|
509 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
|
|
510 | else |
|
|
511 | return true; |
|
|
512 | |
|
|
513 | return false; |
480 | } |
514 | } |
481 | |
515 | |
482 | struct auth_req_packet : config_packet |
516 | struct auth_req_packet : config_packet |
483 | { |
517 | { |
484 | char magic[8]; |
518 | char magic[8]; |
485 | u8 initiate; // false if this is just an automatic reply |
519 | u8 initiate; // false if this is just an automatic reply |
486 | u8 protocols; // supported protocols (will get patches on forward) |
520 | u8 protocols; // supported protocols (will be patched on forward) |
487 | u8 pad2, pad3; |
521 | u8 pad2, pad3; |
488 | rsaid id; |
522 | rsaid id; |
489 | rsaencrdata encr; |
523 | rsaencrdata encr; |
490 | |
524 | |
491 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
525 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
546 | }; |
580 | }; |
547 | |
581 | |
548 | ///////////////////////////////////////////////////////////////////////////// |
582 | ///////////////////////////////////////////////////////////////////////////// |
549 | |
583 | |
550 | void |
584 | void |
|
|
585 | connection::connection_established () |
|
|
586 | { |
|
|
587 | if (ictx && octx) |
|
|
588 | { |
|
|
589 | connectmode = conf->connectmode; |
|
|
590 | |
|
|
591 | // make sure rekeying timeouts are slightly asymmetric |
|
|
592 | rekey.start (NOW + ::conf.rekey |
|
|
593 | + (conf->id > THISNODE->id ? 10 : 0)); |
|
|
594 | keepalive.start (NOW + ::conf.keepalive); |
|
|
595 | |
|
|
596 | // send queued packets |
|
|
597 | if (ictx && octx) |
|
|
598 | { |
|
|
599 | while (tap_packet *p = (tap_packet *)data_queue.get ()) |
|
|
600 | { |
|
|
601 | send_data_packet (p); |
|
|
602 | delete p; |
|
|
603 | } |
|
|
604 | |
|
|
605 | while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
|
|
606 | { |
|
|
607 | send_vpn_packet (p, si, IPTOS_RELIABILITY); |
|
|
608 | delete p; |
|
|
609 | } |
|
|
610 | } |
|
|
611 | } |
|
|
612 | else |
|
|
613 | { |
|
|
614 | retry_cnt = 0; |
|
|
615 | establish_connection.start (NOW + 5); |
|
|
616 | keepalive.stop (); |
|
|
617 | rekey.stop (); |
|
|
618 | } |
|
|
619 | } |
|
|
620 | |
|
|
621 | void |
551 | connection::reset_dstaddr () |
622 | connection::reset_si () |
552 | { |
623 | { |
553 | si.set (conf); |
|
|
554 | } |
|
|
555 | |
|
|
556 | void |
|
|
557 | connection::send_ping (const sockinfo &si, u8 pong) |
|
|
558 | { |
|
|
559 | ping_packet *pkt = new ping_packet; |
|
|
560 | |
|
|
561 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
562 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
|
|
563 | |
|
|
564 | delete pkt; |
|
|
565 | } |
|
|
566 | |
|
|
567 | void |
|
|
568 | connection::send_reset (const sockinfo &si) |
|
|
569 | { |
|
|
570 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
|
|
571 | { |
|
|
572 | config_packet *pkt = new config_packet; |
|
|
573 | |
|
|
574 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
|
|
575 | send_vpn_packet (pkt, si, IPTOS_MINCOST); |
|
|
576 | |
|
|
577 | delete pkt; |
|
|
578 | } |
|
|
579 | } |
|
|
580 | |
|
|
581 | void |
|
|
582 | connection::send_auth_request (const sockinfo &si, bool initiate) |
|
|
583 | { |
|
|
584 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
|
|
585 | |
|
|
586 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
624 | protocol = best_protocol (THISNODE->protocols & conf->protocols); |
587 | |
625 | |
588 | // mask out protocols we cannot establish |
626 | // mask out protocols we cannot establish |
589 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
627 | if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
590 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
628 | if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
|
|
629 | if (!conf->dns_port) protocol &= ~PROT_DNSv4; |
591 | |
630 | |
592 | if (protocol) |
631 | if (protocol |
|
|
632 | && (!conf->can_direct (THISNODE) |
|
|
633 | || !THISNODE->can_direct (conf))) |
|
|
634 | { |
|
|
635 | slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename); |
|
|
636 | protocol = 0; |
593 | { |
637 | } |
594 | rsachallenge chg; |
|
|
595 | |
638 | |
596 | rsa_cache.gen (pkt->id, chg); |
639 | si.set (conf, protocol); |
|
|
640 | } |
597 | |
641 | |
598 | if (0 > RSA_public_encrypt (sizeof chg, |
642 | // ensure sockinfo is valid, forward if necessary |
599 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
643 | const sockinfo & |
600 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
644 | connection::forward_si (const sockinfo &si) const |
601 | fatal ("RSA_public_encrypt error"); |
645 | { |
|
|
646 | if (!si.valid ()) |
|
|
647 | { |
|
|
648 | connection *r = vpn->find_router (); |
602 | |
649 | |
603 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
650 | if (r) |
|
|
651 | { |
|
|
652 | slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"), |
|
|
653 | conf->nodename, r->conf->nodename, (const char *)r->si); |
|
|
654 | return r->si; |
|
|
655 | } |
|
|
656 | else |
|
|
657 | slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
|
|
658 | conf->nodename); |
|
|
659 | } |
604 | |
660 | |
605 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
661 | return si; |
|
|
662 | } |
|
|
663 | |
|
|
664 | void |
|
|
665 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
666 | { |
|
|
667 | if (!vpn->send_vpn_packet (pkt, si, tos)) |
|
|
668 | reset_connection (); |
|
|
669 | } |
|
|
670 | |
|
|
671 | void |
|
|
672 | connection::send_ping (const sockinfo &si, u8 pong) |
|
|
673 | { |
|
|
674 | ping_packet *pkt = new ping_packet; |
|
|
675 | |
|
|
676 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
677 | send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
|
|
678 | |
|
|
679 | delete pkt; |
|
|
680 | } |
|
|
681 | |
|
|
682 | void |
|
|
683 | connection::send_reset (const sockinfo &si) |
|
|
684 | { |
|
|
685 | if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
|
|
686 | { |
|
|
687 | config_packet *pkt = new config_packet; |
|
|
688 | |
|
|
689 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
|
|
690 | send_vpn_packet (pkt, si, IPTOS_MINCOST); |
606 | |
691 | |
607 | delete pkt; |
692 | delete pkt; |
608 | } |
693 | } |
609 | else |
694 | } |
610 | ; // silently fail |
695 | |
|
|
696 | void |
|
|
697 | connection::send_auth_request (const sockinfo &si, bool initiate) |
|
|
698 | { |
|
|
699 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
|
|
700 | |
|
|
701 | rsachallenge chg; |
|
|
702 | rsa_cache.gen (pkt->id, chg); |
|
|
703 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
|
|
704 | |
|
|
705 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
|
|
706 | |
|
|
707 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
|
|
708 | |
|
|
709 | delete pkt; |
611 | } |
710 | } |
612 | |
711 | |
613 | void |
712 | void |
614 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
713 | connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
615 | { |
714 | { |
… | |
… | |
629 | } |
728 | } |
630 | |
729 | |
631 | void |
730 | void |
632 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
731 | connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
633 | { |
732 | { |
634 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
733 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)", |
635 | conf->id, rid, (const char *)rsi); |
734 | conf->id, rid, (const char *)rsi); |
636 | |
735 | |
637 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
736 | connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
638 | |
737 | |
639 | r->hmac_set (octx); |
738 | r->hmac_set (octx); |
… | |
… | |
643 | } |
742 | } |
644 | |
743 | |
645 | void |
744 | void |
646 | connection::establish_connection_cb (time_watcher &w) |
745 | connection::establish_connection_cb (time_watcher &w) |
647 | { |
746 | { |
648 | if (ictx || conf == THISNODE |
747 | if (!ictx |
|
|
748 | && conf != THISNODE |
649 | || connectmode == conf_node::C_NEVER |
749 | && connectmode != conf_node::C_NEVER |
650 | || connectmode == conf_node::C_DISABLED) |
750 | && connectmode != conf_node::C_DISABLED |
651 | w.at = TSTAMP_CANCEL; |
751 | && NOW > w.at) |
652 | else if (w.at <= NOW) |
|
|
653 | { |
752 | { |
654 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
753 | w.at = TSTAMP_MAX; // first disable this watcher in case of recursion |
655 | |
754 | |
656 | if (retry_int < 3600 * 8) |
755 | double retry_int = double (retry_cnt & 3 |
|
|
756 | ? (retry_cnt & 3) + 1 |
|
|
757 | : 1 << (retry_cnt >> 2)); |
|
|
758 | |
|
|
759 | reset_si (); |
|
|
760 | |
|
|
761 | bool slow = si.prot & PROT_SLOW; |
|
|
762 | |
|
|
763 | if (si.prot && !si.host) |
|
|
764 | vpn->send_connect_request (conf->id); |
|
|
765 | else |
|
|
766 | { |
|
|
767 | const sockinfo &dsi = forward_si (si); |
|
|
768 | |
|
|
769 | slow = slow || (dsi.prot & PROT_SLOW); |
|
|
770 | |
|
|
771 | if (dsi.valid () && auth_rate_limiter.can (dsi)) |
|
|
772 | { |
|
|
773 | if (retry_cnt < 4) |
|
|
774 | send_auth_request (dsi, true); |
|
|
775 | else |
|
|
776 | send_ping (dsi, 0); |
|
|
777 | } |
|
|
778 | } |
|
|
779 | |
|
|
780 | retry_int *= slow ? 8. : 0.7; |
|
|
781 | |
|
|
782 | if (retry_int < conf->max_retry) |
657 | retry_cnt++; |
783 | retry_cnt++; |
658 | |
|
|
659 | w.at = NOW + retry_int; |
|
|
660 | |
|
|
661 | if (conf->hostname) |
|
|
662 | { |
|
|
663 | reset_dstaddr (); |
|
|
664 | if (si.host && auth_rate_limiter.can (si)) |
|
|
665 | { |
|
|
666 | if (retry_cnt < 4) |
|
|
667 | send_auth_request (si, true); |
|
|
668 | else |
|
|
669 | send_ping (si, 0); |
|
|
670 | } |
|
|
671 | } |
|
|
672 | else |
784 | else |
673 | vpn->connect_request (conf->id); |
785 | retry_int = conf->max_retry; |
|
|
786 | |
|
|
787 | w.start (NOW + retry_int); |
674 | } |
788 | } |
675 | } |
789 | } |
676 | |
790 | |
677 | void |
791 | void |
678 | connection::reset_connection () |
792 | connection::reset_connection () |
… | |
… | |
681 | { |
795 | { |
682 | slog (L_INFO, _("%s(%s): connection lost"), |
796 | slog (L_INFO, _("%s(%s): connection lost"), |
683 | conf->nodename, (const char *)si); |
797 | conf->nodename, (const char *)si); |
684 | |
798 | |
685 | if (::conf.script_node_down) |
799 | if (::conf.script_node_down) |
686 | run_script (run_script_cb (this, &connection::script_node_down), false); |
800 | if (!run_script (run_script_cb (this, &connection::script_node_down), false)) |
|
|
801 | slog (L_WARN, _("node-down command execution failed, continuing.")); |
687 | } |
802 | } |
688 | |
803 | |
689 | delete ictx; ictx = 0; |
804 | delete ictx; ictx = 0; |
690 | delete octx; octx = 0; |
805 | delete octx; octx = 0; |
|
|
806 | #if ENABLE_DNS |
|
|
807 | dnsv4_reset_connection (); |
|
|
808 | #endif |
691 | |
809 | |
692 | si.host= 0; |
810 | si.host = 0; |
693 | |
811 | |
694 | last_activity = 0; |
812 | last_activity = 0; |
695 | retry_cnt = 0; |
813 | retry_cnt = 0; |
696 | |
814 | |
697 | rekey.reset (); |
815 | rekey.stop (); |
698 | keepalive.reset (); |
816 | keepalive.stop (); |
699 | establish_connection.reset (); |
817 | establish_connection.stop (); |
700 | } |
818 | } |
701 | |
819 | |
702 | void |
820 | void |
703 | connection::shutdown () |
821 | connection::shutdown () |
704 | { |
822 | { |
… | |
… | |
709 | } |
827 | } |
710 | |
828 | |
711 | void |
829 | void |
712 | connection::rekey_cb (time_watcher &w) |
830 | connection::rekey_cb (time_watcher &w) |
713 | { |
831 | { |
714 | w.at = TSTAMP_CANCEL; |
|
|
715 | |
|
|
716 | reset_connection (); |
832 | reset_connection (); |
717 | establish_connection (); |
833 | establish_connection (); |
718 | } |
834 | } |
719 | |
835 | |
720 | void |
836 | void |
721 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
837 | connection::send_data_packet (tap_packet *pkt) |
722 | { |
838 | { |
723 | vpndata_packet *p = new vpndata_packet; |
839 | vpndata_packet *p = new vpndata_packet; |
724 | int tos = 0; |
840 | int tos = 0; |
725 | |
841 | |
726 | if (conf->inherit_tos |
842 | // I am not hilarious about peeking into packets, but so be it. |
727 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
843 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
728 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
729 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
844 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
730 | |
845 | |
731 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
846 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
732 | send_vpn_packet (p, si, tos); |
847 | send_vpn_packet (p, si, tos); |
733 | |
848 | |
734 | delete p; |
849 | delete p; |
735 | |
850 | |
736 | if (oseqno > MAX_SEQNO) |
851 | if (oseqno > MAX_SEQNO) |
737 | rekey (); |
852 | rekey (); |
738 | } |
853 | } |
739 | |
854 | |
740 | void |
855 | void |
741 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
856 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
742 | { |
857 | { |
743 | if (ictx && octx) |
858 | if (ictx && octx) |
744 | send_data_packet (pkt, broadcast); |
859 | send_data_packet (pkt); |
745 | else |
860 | else |
746 | { |
861 | { |
747 | if (!broadcast)//DDDD |
862 | if (!broadcast) |
748 | queue.put (new tap_packet (*pkt)); |
863 | data_queue.put (new tap_packet (*pkt)); |
|
|
864 | |
|
|
865 | establish_connection (); |
|
|
866 | } |
|
|
867 | } |
|
|
868 | |
|
|
869 | void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
|
|
870 | { |
|
|
871 | if (ictx && octx) |
|
|
872 | send_vpn_packet (pkt, si, tos); |
|
|
873 | else |
|
|
874 | { |
|
|
875 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
749 | |
876 | |
750 | establish_connection (); |
877 | establish_connection (); |
751 | } |
878 | } |
752 | } |
879 | } |
753 | |
880 | |
… | |
… | |
812 | if (p->initiate) |
939 | if (p->initiate) |
813 | send_auth_request (rsi, false); |
940 | send_auth_request (rsi, false); |
814 | |
941 | |
815 | rsachallenge k; |
942 | rsachallenge k; |
816 | |
943 | |
817 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
944 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
818 | (unsigned char *)&p->encr, (unsigned char *)&k, |
945 | { |
819 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
820 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
946 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
821 | conf->nodename, (const char *)rsi); |
947 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
948 | break; |
|
|
949 | } |
822 | else |
950 | else |
823 | { |
951 | { |
824 | retry_cnt = 0; |
|
|
825 | establish_connection.set (NOW + 8); //? ;) |
|
|
826 | keepalive.reset (); |
|
|
827 | rekey.reset (); |
|
|
828 | |
|
|
829 | delete ictx; |
|
|
830 | ictx = 0; |
|
|
831 | |
|
|
832 | delete octx; |
952 | delete octx; |
833 | |
953 | |
834 | octx = new crypto_ctx (k, 1); |
954 | octx = new crypto_ctx (k, 1); |
835 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
955 | oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
836 | |
956 | |
837 | conf->protocols = p->protocols; |
957 | conf->protocols = p->protocols; |
|
|
958 | features = p->features & config_packet::get_features (); |
|
|
959 | |
838 | send_auth_response (rsi, p->id, k); |
960 | send_auth_response (rsi, p->id, k); |
|
|
961 | |
|
|
962 | connection_established (); |
839 | |
963 | |
840 | break; |
964 | break; |
841 | } |
965 | } |
842 | } |
966 | } |
|
|
967 | else |
|
|
968 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
|
|
969 | conf->nodename, (const char *)rsi); |
843 | |
970 | |
844 | send_reset (rsi); |
971 | send_reset (rsi); |
845 | } |
972 | } |
846 | |
973 | |
847 | break; |
974 | break; |
… | |
… | |
860 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
987 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
861 | |
988 | |
862 | rsachallenge chg; |
989 | rsachallenge chg; |
863 | |
990 | |
864 | if (!rsa_cache.find (p->id, chg)) |
991 | if (!rsa_cache.find (p->id, chg)) |
|
|
992 | { |
865 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
993 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
866 | conf->nodename, (const char *)rsi); |
994 | conf->nodename, (const char *)rsi); |
|
|
995 | break; |
|
|
996 | } |
867 | else |
997 | else |
868 | { |
998 | { |
869 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
999 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
870 | |
1000 | |
871 | if (!p->hmac_chk (cctx)) |
1001 | if (!p->hmac_chk (cctx)) |
|
|
1002 | { |
872 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
1003 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
873 | "could be an attack, or just corruption or an synchronization error"), |
1004 | "could be an attack, or just corruption or a synchronization error"), |
874 | conf->nodename, (const char *)rsi); |
1005 | conf->nodename, (const char *)rsi); |
|
|
1006 | break; |
|
|
1007 | } |
875 | else |
1008 | else |
876 | { |
1009 | { |
877 | rsaresponse h; |
1010 | rsaresponse h; |
878 | |
1011 | |
879 | rsa_hash (p->id, chg, h); |
1012 | rsa_hash (p->id, chg, h); |
… | |
… | |
885 | delete ictx; ictx = cctx; |
1018 | delete ictx; ictx = cctx; |
886 | |
1019 | |
887 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1020 | iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
888 | |
1021 | |
889 | si = rsi; |
1022 | si = rsi; |
|
|
1023 | protocol = rsi.prot; |
890 | |
1024 | |
891 | rekey.set (NOW + ::conf.rekey); |
1025 | connection_established (); |
892 | keepalive.set (NOW + ::conf.keepalive); |
|
|
893 | |
1026 | |
894 | // send queued packets |
|
|
895 | while (tap_packet *p = queue.get ()) |
|
|
896 | { |
|
|
897 | send_data_packet (p); |
|
|
898 | delete p; |
|
|
899 | } |
|
|
900 | |
|
|
901 | connectmode = conf->connectmode; |
|
|
902 | |
|
|
903 | slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"), |
1027 | slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
904 | conf->nodename, (const char *)rsi, |
1028 | conf->nodename, (const char *)rsi, |
905 | strprotocol (protocol), |
|
|
906 | p->prot_major, p->prot_minor); |
1029 | p->prot_major, p->prot_minor); |
907 | |
1030 | |
908 | if (::conf.script_node_up) |
1031 | if (::conf.script_node_up) |
909 | run_script (run_script_cb (this, &connection::script_node_up), false); |
1032 | if (!run_script (run_script_cb (this, &connection::script_node_up), false)) |
|
|
1033 | slog (L_WARN, _("node-up command execution failed, continuing.")); |
910 | |
1034 | |
911 | break; |
1035 | break; |
912 | } |
1036 | } |
913 | else |
1037 | else |
914 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1038 | slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
… | |
… | |
933 | |
1057 | |
934 | if (ictx && octx) |
1058 | if (ictx && octx) |
935 | { |
1059 | { |
936 | vpndata_packet *p = (vpndata_packet *)pkt; |
1060 | vpndata_packet *p = (vpndata_packet *)pkt; |
937 | |
1061 | |
938 | if (rsi == si) |
1062 | if (!p->hmac_chk (ictx)) |
|
|
1063 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
1064 | "could be an attack, or just corruption or a synchronization error"), |
|
|
1065 | conf->nodename, (const char *)rsi); |
|
|
1066 | else |
939 | { |
1067 | { |
940 | if (!p->hmac_chk (ictx)) |
|
|
941 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
|
|
942 | "could be an attack, or just corruption or an synchronization error"), |
|
|
943 | conf->nodename, (const char *)rsi); |
|
|
944 | else |
1068 | u32 seqno; |
|
|
1069 | tap_packet *d = p->unpack (this, seqno); |
|
|
1070 | |
|
|
1071 | if (iseqno.recv_ok (seqno)) |
945 | { |
1072 | { |
946 | u32 seqno; |
1073 | vpn->tap->send (d); |
947 | tap_packet *d = p->unpack (this, seqno); |
|
|
948 | |
1074 | |
949 | if (iseqno.recv_ok (seqno)) |
1075 | if (si != rsi) |
950 | { |
1076 | { |
951 | vpn->tap->send (d); |
1077 | // fast re-sync on source address changes, useful especially for tcp/ip |
952 | |
|
|
953 | if (p->dst () == 0) // re-broadcast |
|
|
954 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
955 | { |
|
|
956 | connection *c = *i; |
|
|
957 | |
|
|
958 | if (c->conf != THISNODE && c->conf != conf) |
|
|
959 | c->inject_data_packet (d); |
|
|
960 | } |
|
|
961 | |
|
|
962 | delete d; |
|
|
963 | |
|
|
964 | break; |
1078 | si = rsi; |
|
|
1079 | |
|
|
1080 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
|
|
1081 | conf->nodename, (const char *)si, (const char *)rsi); |
965 | } |
1082 | } |
966 | } |
1083 | } |
|
|
1084 | |
|
|
1085 | delete d; |
|
|
1086 | break; |
967 | } |
1087 | } |
968 | else |
|
|
969 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi); |
|
|
970 | } |
1088 | } |
971 | |
1089 | |
972 | send_reset (rsi); |
1090 | send_reset (rsi); |
973 | break; |
1091 | break; |
974 | |
1092 | |
975 | case vpn_packet::PT_CONNECT_REQ: |
1093 | case vpn_packet::PT_CONNECT_REQ: |
976 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1094 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
977 | { |
1095 | { |
978 | connect_req_packet *p = (connect_req_packet *) pkt; |
1096 | connect_req_packet *p = (connect_req_packet *) pkt; |
979 | |
1097 | |
980 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1098 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
981 | conf->protocols = p->protocols; |
|
|
982 | connection *c = vpn->conns[p->id - 1]; |
|
|
983 | |
|
|
984 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
985 | conf->id, p->id, c->ictx && c->octx); |
|
|
986 | |
|
|
987 | if (c->ictx && c->octx) |
|
|
988 | { |
1099 | { |
|
|
1100 | connection *c = vpn->conns[p->id - 1]; |
|
|
1101 | conf->protocols = p->protocols; |
|
|
1102 | |
|
|
1103 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]", |
|
|
1104 | conf->id, p->id, c->ictx && c->octx); |
|
|
1105 | |
|
|
1106 | if (c->ictx && c->octx) |
|
|
1107 | { |
989 | // send connect_info packets to both sides, in case one is |
1108 | // send connect_info packets to both sides, in case one is |
990 | // behind a nat firewall (or both ;) |
1109 | // behind a nat firewall (or both ;) |
991 | c->send_connect_info (conf->id, si, conf->protocols); |
1110 | c->send_connect_info (conf->id, si, conf->protocols); |
992 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1111 | send_connect_info (c->conf->id, c->si, c->conf->protocols); |
|
|
1112 | } |
|
|
1113 | else |
|
|
1114 | c->establish_connection (); |
993 | } |
1115 | } |
|
|
1116 | else |
|
|
1117 | slog (L_WARN, |
|
|
1118 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1119 | p->id); |
994 | } |
1120 | } |
995 | |
1121 | |
996 | break; |
1122 | break; |
997 | |
1123 | |
998 | case vpn_packet::PT_CONNECT_INFO: |
1124 | case vpn_packet::PT_CONNECT_INFO: |
999 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1125 | if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1000 | { |
1126 | { |
1001 | connect_info_packet *p = (connect_info_packet *) pkt; |
1127 | connect_info_packet *p = (connect_info_packet *)pkt; |
1002 | |
1128 | |
1003 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1129 | if (p->id > 0 && p->id <= vpn->conns.size ()) |
1004 | conf->protocols = p->protocols; |
1130 | { |
1005 | connection *c = vpn->conns[p->id - 1]; |
1131 | connection *c = vpn->conns[p->id - 1]; |
1006 | |
1132 | |
|
|
1133 | c->conf->protocols = p->protocols; |
|
|
1134 | protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
|
|
1135 | p->si.upgrade_protocol (protocol, c->conf); |
|
|
1136 | |
1007 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1137 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1008 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1138 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1009 | |
1139 | |
|
|
1140 | const sockinfo &dsi = forward_si (p->si); |
|
|
1141 | |
|
|
1142 | if (dsi.valid ()) |
1010 | c->send_auth_request (p->si, true); |
1143 | c->send_auth_request (dsi, true); |
|
|
1144 | } |
|
|
1145 | else |
|
|
1146 | slog (L_WARN, |
|
|
1147 | _("received authenticated connection request from unknown node #%d, config file mismatch?"), |
|
|
1148 | p->id); |
1011 | } |
1149 | } |
1012 | |
1150 | |
1013 | break; |
1151 | break; |
1014 | |
1152 | |
1015 | default: |
1153 | default: |
… | |
… | |
1024 | { |
1162 | { |
1025 | reset_connection (); |
1163 | reset_connection (); |
1026 | establish_connection (); |
1164 | establish_connection (); |
1027 | } |
1165 | } |
1028 | else if (NOW < last_activity + ::conf.keepalive) |
1166 | else if (NOW < last_activity + ::conf.keepalive) |
1029 | w.at = last_activity + ::conf.keepalive; |
1167 | w.start (last_activity + ::conf.keepalive); |
1030 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1168 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1031 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1169 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1032 | { |
1170 | { |
1033 | send_ping (si); |
1171 | send_ping (si); |
1034 | w.at = NOW + 5; |
1172 | w.start (NOW + 5); |
1035 | } |
1173 | } |
|
|
1174 | else if (NOW < last_activity + ::conf.keepalive + 10) |
|
|
1175 | // hold ondemand connections implicitly a few seconds longer |
|
|
1176 | // should delete octx, though, or something like that ;) |
|
|
1177 | w.start (last_activity + ::conf.keepalive + 10); |
1036 | else |
1178 | else |
1037 | reset_connection (); |
1179 | reset_connection (); |
1038 | } |
1180 | } |
1039 | |
1181 | |
1040 | void connection::connect_request (int id) |
1182 | void connection::send_connect_request (int id) |
1041 | { |
1183 | { |
1042 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1184 | connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1043 | |
1185 | |
1044 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1186 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1045 | p->hmac_set (octx); |
1187 | p->hmac_set (octx); |
1046 | send_vpn_packet (p, si); |
1188 | send_vpn_packet (p, si); |
1047 | |
1189 | |
1048 | delete p; |
1190 | delete p; |
1049 | } |
1191 | } |
1050 | |
1192 | |
|
|
1193 | void connection::script_init_env (const char *ext) |
|
|
1194 | { |
|
|
1195 | char *env; |
|
|
1196 | asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env); |
|
|
1197 | asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env); |
|
|
1198 | asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext, |
|
|
1199 | 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8, |
|
|
1200 | conf->id & 0xff); putenv (env); |
|
|
1201 | } |
|
|
1202 | |
1051 | void connection::script_node () |
1203 | void connection::script_init_connect_env () |
1052 | { |
1204 | { |
1053 | vpn->script_if_up (); |
1205 | vpn->script_init_env (); |
1054 | |
1206 | |
1055 | char *env; |
1207 | char *env; |
1056 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1208 | asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1057 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1209 | asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1058 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1210 | asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1059 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1211 | asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1060 | } |
1212 | } |
1061 | |
1213 | |
1062 | const char *connection::script_node_up () |
1214 | const char *connection::script_node_up () |
1063 | { |
1215 | { |
1064 | script_node (); |
1216 | script_init_connect_env (); |
1065 | |
1217 | |
1066 | putenv ("STATE=up"); |
1218 | putenv ("STATE=up"); |
1067 | |
1219 | |
|
|
1220 | char *filename; |
|
|
1221 | asprintf (&filename, |
|
|
1222 | "%s/%s", |
|
|
1223 | confbase, |
1068 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1224 | ::conf.script_node_up ? ::conf.script_node_up : "node-up"); |
|
|
1225 | |
|
|
1226 | return filename; |
1069 | } |
1227 | } |
1070 | |
1228 | |
1071 | const char *connection::script_node_down () |
1229 | const char *connection::script_node_down () |
1072 | { |
1230 | { |
1073 | script_node (); |
1231 | script_init_connect_env (); |
1074 | |
1232 | |
1075 | putenv ("STATE=down"); |
1233 | putenv ("STATE=down"); |
1076 | |
1234 | |
1077 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1235 | char *filename; |
1078 | } |
1236 | asprintf (&filename, |
|
|
1237 | "%s/%s", |
|
|
1238 | confbase, |
|
|
1239 | ::conf.script_node_down ? ::conf.script_node_down : "node-down"); |
1079 | |
1240 | |
1080 | // send a vpn packet out to other hosts |
1241 | return filename; |
1081 | void |
|
|
1082 | connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
1083 | { |
|
|
1084 | switch (protocol) |
|
|
1085 | { |
|
|
1086 | case PROT_IPv4: |
|
|
1087 | vpn->send_ipv4_packet (pkt, si, tos); |
|
|
1088 | break; |
|
|
1089 | |
|
|
1090 | case PROT_UDPv4: |
|
|
1091 | vpn->send_udpv4_packet (pkt, si, tos); |
|
|
1092 | break; |
|
|
1093 | |
|
|
1094 | case PROT_TCPv4: |
|
|
1095 | vpn->send_tcpv4_packet (pkt, si, tos); |
|
|
1096 | break; |
|
|
1097 | } |
|
|
1098 | } |
1242 | } |
1099 | |
1243 | |
1100 | connection::connection(struct vpn *vpn_) |
1244 | connection::connection (struct vpn *vpn, conf_node *conf) |
1101 | : vpn(vpn_) |
1245 | : vpn(vpn), conf(conf) |
1102 | , rekey (this, &connection::rekey_cb) |
1246 | , rekey (this, &connection::rekey_cb) |
1103 | , keepalive (this, &connection::keepalive_cb) |
1247 | , keepalive (this, &connection::keepalive_cb) |
1104 | , establish_connection (this, &connection::establish_connection_cb) |
1248 | , establish_connection (this, &connection::establish_connection_cb) |
|
|
1249 | #if ENABLE_DNS |
|
|
1250 | , dns (0) |
|
|
1251 | #endif |
1105 | { |
1252 | { |
1106 | octx = ictx = 0; |
1253 | octx = ictx = 0; |
1107 | retry_cnt = 0; |
1254 | retry_cnt = 0; |
1108 | |
1255 | |
|
|
1256 | if (!conf->protocols) // make sure some protocol is enabled |
|
|
1257 | conf->protocols = PROT_UDPv4; |
|
|
1258 | |
1109 | connectmode = conf_node::C_ALWAYS; // initial setting |
1259 | connectmode = conf_node::C_ALWAYS; // initial setting |
1110 | reset_connection (); |
1260 | reset_connection (); |
1111 | } |
1261 | } |
1112 | |
1262 | |
1113 | connection::~connection () |
1263 | connection::~connection () |