1 |
pcg |
1.1 |
/* |
2 |
|
|
connection.C -- manage a single connection |
3 |
|
|
|
4 |
|
|
This program is free software; you can redistribute it and/or modify |
5 |
|
|
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 |
7 |
|
|
(at your option) any later version. |
8 |
|
|
|
9 |
|
|
This program is distributed in the hope that it will be useful, |
10 |
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of |
11 |
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
12 |
|
|
GNU General Public License for more details. |
13 |
|
|
|
14 |
|
|
You should have received a copy of the GNU General Public License |
15 |
|
|
along with this program; if not, write to the Free Software |
16 |
|
|
Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
17 |
|
|
*/ |
18 |
|
|
|
19 |
|
|
#include "config.h" |
20 |
|
|
|
21 |
|
|
extern "C" { |
22 |
|
|
# include "lzf/lzf.h" |
23 |
|
|
} |
24 |
|
|
|
25 |
|
|
#include <list> |
26 |
|
|
|
27 |
pcg |
1.2 |
#include <openssl/rand.h> |
28 |
|
|
#include <openssl/evp.h> |
29 |
|
|
#include <openssl/rsa.h> |
30 |
|
|
#include <openssl/err.h> |
31 |
|
|
|
32 |
pcg |
1.1 |
#include "gettext.h" |
33 |
|
|
|
34 |
|
|
#include "conf.h" |
35 |
|
|
#include "slog.h" |
36 |
|
|
#include "device.h" |
37 |
pcg |
1.2 |
#include "vpn.h" |
38 |
pcg |
1.1 |
#include "connection.h" |
39 |
|
|
|
40 |
pcg |
1.19 |
#include <sys/socket.h> |
41 |
|
|
#ifdef HAVE_NETINET_IN_H |
42 |
|
|
# include <netinet/in.h> |
43 |
|
|
#endif |
44 |
|
|
#include <arpa/inet.h> |
45 |
|
|
#include <net/if.h> |
46 |
|
|
#ifdef HAVE_NETINET_IN_SYSTM_H |
47 |
|
|
# include <netinet/in_systm.h> |
48 |
|
|
#endif |
49 |
|
|
#ifdef HAVE_NETINET_IP_H |
50 |
|
|
# include <netinet/ip.h> |
51 |
|
|
#endif |
52 |
|
|
|
53 |
|
|
#ifndef IPTOS_TOS_MASK |
54 |
|
|
# define IPTOS_TOS_MASK (IPTOS_LOWDELAY | IPTOS_THROUGHPUT | IPTOS_RELIABILITY | IPTOS_MINCOST) |
55 |
|
|
#endif |
56 |
|
|
|
57 |
pcg |
1.1 |
#if !HAVE_RAND_PSEUDO_BYTES |
58 |
|
|
# define RAND_pseudo_bytes RAND_bytes |
59 |
|
|
#endif |
60 |
|
|
|
61 |
|
|
#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
62 |
|
|
|
63 |
|
|
struct crypto_ctx |
64 |
|
|
{ |
65 |
|
|
EVP_CIPHER_CTX cctx; |
66 |
|
|
HMAC_CTX hctx; |
67 |
|
|
|
68 |
|
|
crypto_ctx (const rsachallenge &challenge, int enc); |
69 |
|
|
~crypto_ctx (); |
70 |
|
|
}; |
71 |
|
|
|
72 |
|
|
crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
73 |
|
|
{ |
74 |
|
|
EVP_CIPHER_CTX_init (&cctx); |
75 |
|
|
EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
76 |
|
|
HMAC_CTX_init (&hctx); |
77 |
|
|
HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
78 |
|
|
} |
79 |
|
|
|
80 |
|
|
crypto_ctx::~crypto_ctx () |
81 |
|
|
{ |
82 |
|
|
EVP_CIPHER_CTX_cleanup (&cctx); |
83 |
|
|
HMAC_CTX_cleanup (&hctx); |
84 |
|
|
} |
85 |
|
|
|
86 |
|
|
static void |
87 |
|
|
rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
88 |
|
|
{ |
89 |
|
|
EVP_MD_CTX ctx; |
90 |
|
|
|
91 |
|
|
EVP_MD_CTX_init (&ctx); |
92 |
|
|
EVP_DigestInit (&ctx, RSA_HASH); |
93 |
|
|
EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
94 |
|
|
EVP_DigestUpdate(&ctx, &id, sizeof id); |
95 |
|
|
EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
96 |
|
|
EVP_MD_CTX_cleanup (&ctx); |
97 |
|
|
} |
98 |
|
|
|
99 |
|
|
struct rsa_entry { |
100 |
|
|
tstamp expire; |
101 |
|
|
rsaid id; |
102 |
|
|
rsachallenge chg; |
103 |
|
|
}; |
104 |
|
|
|
105 |
|
|
struct rsa_cache : list<rsa_entry> |
106 |
|
|
{ |
107 |
pcg |
1.4 |
void cleaner_cb (time_watcher &w); time_watcher cleaner; |
108 |
pcg |
1.1 |
|
109 |
|
|
bool find (const rsaid &id, rsachallenge &chg) |
110 |
|
|
{ |
111 |
|
|
for (iterator i = begin (); i != end (); ++i) |
112 |
|
|
{ |
113 |
|
|
if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) |
114 |
|
|
{ |
115 |
|
|
memcpy (&chg, &i->chg, sizeof chg); |
116 |
|
|
|
117 |
|
|
erase (i); |
118 |
|
|
return true; |
119 |
|
|
} |
120 |
|
|
} |
121 |
|
|
|
122 |
|
|
if (cleaner.at < NOW) |
123 |
|
|
cleaner.start (NOW + RSA_TTL); |
124 |
|
|
|
125 |
|
|
return false; |
126 |
|
|
} |
127 |
|
|
|
128 |
|
|
void gen (rsaid &id, rsachallenge &chg) |
129 |
|
|
{ |
130 |
|
|
rsa_entry e; |
131 |
|
|
|
132 |
|
|
RAND_bytes ((unsigned char *)&id, sizeof id); |
133 |
|
|
RAND_bytes ((unsigned char *)&chg, sizeof chg); |
134 |
|
|
|
135 |
|
|
e.expire = NOW + RSA_TTL; |
136 |
|
|
e.id = id; |
137 |
|
|
memcpy (&e.chg, &chg, sizeof chg); |
138 |
|
|
|
139 |
|
|
push_back (e); |
140 |
|
|
|
141 |
|
|
if (cleaner.at < NOW) |
142 |
|
|
cleaner.start (NOW + RSA_TTL); |
143 |
|
|
} |
144 |
|
|
|
145 |
|
|
rsa_cache () |
146 |
|
|
: cleaner (this, &rsa_cache::cleaner_cb) |
147 |
|
|
{ } |
148 |
|
|
|
149 |
|
|
} rsa_cache; |
150 |
|
|
|
151 |
pcg |
1.4 |
void rsa_cache::cleaner_cb (time_watcher &w) |
152 |
pcg |
1.1 |
{ |
153 |
|
|
if (empty ()) |
154 |
pcg |
1.4 |
w.at = TSTAMP_CANCEL; |
155 |
pcg |
1.1 |
else |
156 |
|
|
{ |
157 |
pcg |
1.4 |
w.at = NOW + RSA_TTL; |
158 |
pcg |
1.1 |
|
159 |
|
|
for (iterator i = begin (); i != end (); ) |
160 |
|
|
if (i->expire <= NOW) |
161 |
|
|
i = erase (i); |
162 |
|
|
else |
163 |
|
|
++i; |
164 |
|
|
} |
165 |
|
|
} |
166 |
|
|
|
167 |
|
|
////////////////////////////////////////////////////////////////////////////// |
168 |
|
|
|
169 |
pcg |
1.12 |
void pkt_queue::put (net_packet *p) |
170 |
pcg |
1.1 |
{ |
171 |
|
|
if (queue[i]) |
172 |
|
|
{ |
173 |
|
|
delete queue[i]; |
174 |
|
|
j = (j + 1) % QUEUEDEPTH; |
175 |
|
|
} |
176 |
|
|
|
177 |
|
|
queue[i] = p; |
178 |
|
|
|
179 |
|
|
i = (i + 1) % QUEUEDEPTH; |
180 |
|
|
} |
181 |
|
|
|
182 |
pcg |
1.12 |
net_packet *pkt_queue::get () |
183 |
pcg |
1.1 |
{ |
184 |
pcg |
1.12 |
net_packet *p = queue[j]; |
185 |
pcg |
1.1 |
|
186 |
|
|
if (p) |
187 |
|
|
{ |
188 |
|
|
queue[j] = 0; |
189 |
|
|
j = (j + 1) % QUEUEDEPTH; |
190 |
|
|
} |
191 |
|
|
|
192 |
|
|
return p; |
193 |
|
|
} |
194 |
|
|
|
195 |
|
|
pkt_queue::pkt_queue () |
196 |
|
|
{ |
197 |
|
|
memset (queue, 0, sizeof (queue)); |
198 |
|
|
i = 0; |
199 |
|
|
j = 0; |
200 |
|
|
} |
201 |
|
|
|
202 |
|
|
pkt_queue::~pkt_queue () |
203 |
|
|
{ |
204 |
|
|
for (i = QUEUEDEPTH; --i > 0; ) |
205 |
|
|
delete queue[i]; |
206 |
|
|
} |
207 |
|
|
|
208 |
|
|
struct net_rateinfo { |
209 |
|
|
u32 host; |
210 |
|
|
double pcnt, diff; |
211 |
|
|
tstamp last; |
212 |
|
|
}; |
213 |
|
|
|
214 |
|
|
// only do action once every x seconds per host whole allowing bursts. |
215 |
|
|
// this implementation ("splay list" ;) is inefficient, |
216 |
|
|
// but low on resources. |
217 |
|
|
struct net_rate_limiter : list<net_rateinfo> |
218 |
|
|
{ |
219 |
pcg |
1.16 |
static const double ALPHA = 1. - 1. / 600.; // allow bursts |
220 |
pcg |
1.9 |
static const double CUTOFF = 10.; // one event every CUTOFF seconds |
221 |
|
|
static const double EXPIRE = CUTOFF * 30.; // expire entries after this time |
222 |
pcg |
1.10 |
static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value |
223 |
pcg |
1.1 |
|
224 |
pcg |
1.16 |
bool can (const sockinfo &si) { return can((u32)si.host); } |
225 |
pcg |
1.1 |
bool can (u32 host); |
226 |
|
|
}; |
227 |
|
|
|
228 |
|
|
net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
229 |
|
|
|
230 |
|
|
bool net_rate_limiter::can (u32 host) |
231 |
|
|
{ |
232 |
|
|
iterator i; |
233 |
|
|
|
234 |
|
|
for (i = begin (); i != end (); ) |
235 |
|
|
if (i->host == host) |
236 |
|
|
break; |
237 |
|
|
else if (i->last < NOW - EXPIRE) |
238 |
|
|
i = erase (i); |
239 |
|
|
else |
240 |
|
|
i++; |
241 |
|
|
|
242 |
|
|
if (i == end ()) |
243 |
|
|
{ |
244 |
|
|
net_rateinfo ri; |
245 |
|
|
|
246 |
|
|
ri.host = host; |
247 |
|
|
ri.pcnt = 1.; |
248 |
pcg |
1.10 |
ri.diff = MAXDIF; |
249 |
pcg |
1.1 |
ri.last = NOW; |
250 |
|
|
|
251 |
|
|
push_front (ri); |
252 |
|
|
|
253 |
|
|
return true; |
254 |
|
|
} |
255 |
|
|
else |
256 |
|
|
{ |
257 |
|
|
net_rateinfo ri (*i); |
258 |
|
|
erase (i); |
259 |
|
|
|
260 |
|
|
ri.pcnt = ri.pcnt * ALPHA; |
261 |
|
|
ri.diff = ri.diff * ALPHA + (NOW - ri.last); |
262 |
|
|
|
263 |
|
|
ri.last = NOW; |
264 |
|
|
|
265 |
pcg |
1.10 |
double dif = ri.diff / ri.pcnt; |
266 |
pcg |
1.1 |
|
267 |
pcg |
1.10 |
bool send = dif > CUTOFF; |
268 |
|
|
|
269 |
|
|
if (dif > MAXDIF) |
270 |
|
|
{ |
271 |
|
|
ri.pcnt = 1.; |
272 |
|
|
ri.diff = MAXDIF; |
273 |
|
|
} |
274 |
|
|
else if (send) |
275 |
pcg |
1.1 |
ri.pcnt++; |
276 |
|
|
|
277 |
|
|
push_front (ri); |
278 |
|
|
|
279 |
|
|
return send; |
280 |
|
|
} |
281 |
|
|
} |
282 |
|
|
|
283 |
|
|
///////////////////////////////////////////////////////////////////////////// |
284 |
|
|
|
285 |
|
|
unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE]; |
286 |
|
|
|
287 |
|
|
void hmac_packet::hmac_gen (crypto_ctx *ctx) |
288 |
|
|
{ |
289 |
|
|
unsigned int xlen; |
290 |
|
|
|
291 |
|
|
HMAC_CTX *hctx = &ctx->hctx; |
292 |
|
|
|
293 |
|
|
HMAC_Init_ex (hctx, 0, 0, 0, 0); |
294 |
|
|
HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
295 |
|
|
len - sizeof (hmac_packet)); |
296 |
|
|
HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
297 |
|
|
} |
298 |
|
|
|
299 |
|
|
void |
300 |
|
|
hmac_packet::hmac_set (crypto_ctx *ctx) |
301 |
|
|
{ |
302 |
|
|
hmac_gen (ctx); |
303 |
|
|
|
304 |
|
|
memcpy (hmac, hmac_digest, HMACLENGTH); |
305 |
|
|
} |
306 |
|
|
|
307 |
|
|
bool |
308 |
|
|
hmac_packet::hmac_chk (crypto_ctx *ctx) |
309 |
|
|
{ |
310 |
|
|
hmac_gen (ctx); |
311 |
|
|
|
312 |
|
|
return !memcmp (hmac, hmac_digest, HMACLENGTH); |
313 |
|
|
} |
314 |
|
|
|
315 |
pcg |
1.6 |
void vpn_packet::set_hdr (ptype type_, unsigned int dst) |
316 |
pcg |
1.1 |
{ |
317 |
pcg |
1.6 |
type = type_; |
318 |
pcg |
1.1 |
|
319 |
|
|
int src = THISNODE->id; |
320 |
|
|
|
321 |
|
|
src1 = src; |
322 |
|
|
srcdst = ((src >> 8) << 4) | (dst >> 8); |
323 |
|
|
dst1 = dst; |
324 |
|
|
} |
325 |
|
|
|
326 |
|
|
#define MAXVPNDATA (MAX_MTU - 6 - 6) |
327 |
|
|
#define DATAHDR (sizeof (u32) + RAND_SIZE) |
328 |
|
|
|
329 |
|
|
struct vpndata_packet:vpn_packet |
330 |
|
|
{ |
331 |
|
|
u8 data[MAXVPNDATA + DATAHDR]; // seqno |
332 |
|
|
|
333 |
|
|
void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
334 |
|
|
tap_packet *unpack (connection *conn, u32 &seqno); |
335 |
|
|
private: |
336 |
|
|
|
337 |
|
|
const u32 data_hdr_size () const |
338 |
|
|
{ |
339 |
|
|
return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
340 |
|
|
} |
341 |
|
|
}; |
342 |
|
|
|
343 |
|
|
void |
344 |
|
|
vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
345 |
|
|
{ |
346 |
|
|
EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
347 |
|
|
int outl = 0, outl2; |
348 |
|
|
ptype type = PT_DATA_UNCOMPRESSED; |
349 |
|
|
|
350 |
|
|
#if ENABLE_COMPRESSION |
351 |
|
|
u8 cdata[MAX_MTU]; |
352 |
|
|
u32 cl; |
353 |
|
|
|
354 |
|
|
cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
355 |
|
|
if (cl) |
356 |
|
|
{ |
357 |
|
|
type = PT_DATA_COMPRESSED; |
358 |
|
|
d = cdata; |
359 |
|
|
l = cl + 2; |
360 |
|
|
|
361 |
|
|
d[0] = cl >> 8; |
362 |
|
|
d[1] = cl; |
363 |
|
|
} |
364 |
|
|
#endif |
365 |
|
|
|
366 |
|
|
EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
367 |
|
|
|
368 |
|
|
struct { |
369 |
|
|
#if RAND_SIZE |
370 |
|
|
u8 rnd[RAND_SIZE]; |
371 |
|
|
#endif |
372 |
|
|
u32 seqno; |
373 |
|
|
} datahdr; |
374 |
|
|
|
375 |
|
|
datahdr.seqno = ntohl (seqno); |
376 |
|
|
#if RAND_SIZE |
377 |
|
|
RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
378 |
|
|
#endif |
379 |
|
|
|
380 |
|
|
EVP_EncryptUpdate (cctx, |
381 |
|
|
(unsigned char *) data + outl, &outl2, |
382 |
|
|
(unsigned char *) &datahdr, DATAHDR); |
383 |
|
|
outl += outl2; |
384 |
|
|
|
385 |
|
|
EVP_EncryptUpdate (cctx, |
386 |
|
|
(unsigned char *) data + outl, &outl2, |
387 |
|
|
(unsigned char *) d, l); |
388 |
|
|
outl += outl2; |
389 |
|
|
|
390 |
|
|
EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
391 |
|
|
outl += outl2; |
392 |
|
|
|
393 |
|
|
len = outl + data_hdr_size (); |
394 |
|
|
|
395 |
|
|
set_hdr (type, dst); |
396 |
|
|
|
397 |
|
|
hmac_set (conn->octx); |
398 |
|
|
} |
399 |
|
|
|
400 |
|
|
tap_packet * |
401 |
|
|
vpndata_packet::unpack (connection *conn, u32 &seqno) |
402 |
|
|
{ |
403 |
|
|
EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
404 |
|
|
int outl = 0, outl2; |
405 |
|
|
tap_packet *p = new tap_packet; |
406 |
|
|
u8 *d; |
407 |
|
|
u32 l = len - data_hdr_size (); |
408 |
|
|
|
409 |
|
|
EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
410 |
|
|
|
411 |
|
|
#if ENABLE_COMPRESSION |
412 |
|
|
u8 cdata[MAX_MTU]; |
413 |
|
|
|
414 |
|
|
if (type == PT_DATA_COMPRESSED) |
415 |
|
|
d = cdata; |
416 |
|
|
else |
417 |
|
|
#endif |
418 |
|
|
d = &(*p)[6 + 6 - DATAHDR]; |
419 |
|
|
|
420 |
|
|
/* this overwrites part of the src mac, but we fix that later */ |
421 |
|
|
EVP_DecryptUpdate (cctx, |
422 |
|
|
d, &outl2, |
423 |
|
|
(unsigned char *)&data, len - data_hdr_size ()); |
424 |
|
|
outl += outl2; |
425 |
|
|
|
426 |
|
|
EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
427 |
|
|
outl += outl2; |
428 |
|
|
|
429 |
|
|
seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
430 |
|
|
|
431 |
|
|
id2mac (dst () ? dst() : THISNODE->id, p->dst); |
432 |
|
|
id2mac (src (), p->src); |
433 |
|
|
|
434 |
|
|
#if ENABLE_COMPRESSION |
435 |
|
|
if (type == PT_DATA_COMPRESSED) |
436 |
|
|
{ |
437 |
|
|
u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
438 |
|
|
|
439 |
|
|
p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0, |
440 |
|
|
&(*p)[6 + 6], MAX_MTU) |
441 |
|
|
+ 6 + 6; |
442 |
|
|
} |
443 |
|
|
else |
444 |
|
|
p->len = outl + (6 + 6 - DATAHDR); |
445 |
|
|
#endif |
446 |
|
|
|
447 |
|
|
return p; |
448 |
|
|
} |
449 |
|
|
|
450 |
|
|
struct ping_packet : vpn_packet |
451 |
|
|
{ |
452 |
|
|
void setup (int dst, ptype type) |
453 |
|
|
{ |
454 |
|
|
set_hdr (type, dst); |
455 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
456 |
|
|
} |
457 |
|
|
}; |
458 |
|
|
|
459 |
|
|
struct config_packet : vpn_packet |
460 |
|
|
{ |
461 |
|
|
// actually, hmaclen cannot be checked because the hmac |
462 |
|
|
// field comes before this data, so peers with other |
463 |
|
|
// hmacs simply will not work. |
464 |
|
|
u8 prot_major, prot_minor, randsize, hmaclen; |
465 |
|
|
u8 flags, challengelen, pad2, pad3; |
466 |
|
|
u32 cipher_nid, digest_nid, hmac_nid; |
467 |
|
|
|
468 |
|
|
const u8 curflags () const |
469 |
|
|
{ |
470 |
|
|
return 0x80 |
471 |
|
|
| (ENABLE_COMPRESSION ? 0x01 : 0x00); |
472 |
|
|
} |
473 |
|
|
|
474 |
|
|
void setup (ptype type, int dst); |
475 |
|
|
bool chk_config () const; |
476 |
|
|
}; |
477 |
|
|
|
478 |
|
|
void config_packet::setup (ptype type, int dst) |
479 |
|
|
{ |
480 |
|
|
prot_major = PROTOCOL_MAJOR; |
481 |
|
|
prot_minor = PROTOCOL_MINOR; |
482 |
|
|
randsize = RAND_SIZE; |
483 |
|
|
hmaclen = HMACLENGTH; |
484 |
|
|
flags = curflags (); |
485 |
|
|
challengelen = sizeof (rsachallenge); |
486 |
|
|
|
487 |
|
|
cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
488 |
|
|
digest_nid = htonl (EVP_MD_type (RSA_HASH)); |
489 |
|
|
hmac_nid = htonl (EVP_MD_type (DIGEST)); |
490 |
|
|
|
491 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
492 |
|
|
set_hdr (type, dst); |
493 |
|
|
} |
494 |
|
|
|
495 |
|
|
bool config_packet::chk_config () const |
496 |
|
|
{ |
497 |
pcg |
1.15 |
if (prot_major != PROTOCOL_MAJOR) |
498 |
|
|
slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); |
499 |
|
|
else if (randsize != RAND_SIZE) |
500 |
|
|
slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); |
501 |
|
|
else if (hmaclen != HMACLENGTH) |
502 |
|
|
slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
503 |
|
|
else if (flags != curflags ()) |
504 |
|
|
slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
505 |
|
|
else if (challengelen != sizeof (rsachallenge)) |
506 |
|
|
slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); |
507 |
|
|
else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
508 |
|
|
slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
509 |
|
|
else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
510 |
|
|
slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
511 |
|
|
else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
512 |
|
|
slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
513 |
|
|
else |
514 |
|
|
return true; |
515 |
|
|
|
516 |
|
|
return false; |
517 |
pcg |
1.1 |
} |
518 |
|
|
|
519 |
|
|
struct auth_req_packet : config_packet |
520 |
|
|
{ |
521 |
|
|
char magic[8]; |
522 |
|
|
u8 initiate; // false if this is just an automatic reply |
523 |
|
|
u8 protocols; // supported protocols (will get patches on forward) |
524 |
|
|
u8 pad2, pad3; |
525 |
|
|
rsaid id; |
526 |
|
|
rsaencrdata encr; |
527 |
|
|
|
528 |
|
|
auth_req_packet (int dst, bool initiate_, u8 protocols_) |
529 |
|
|
{ |
530 |
|
|
config_packet::setup (PT_AUTH_REQ, dst); |
531 |
|
|
strncpy (magic, MAGIC, 8); |
532 |
|
|
initiate = !!initiate_; |
533 |
|
|
protocols = protocols_; |
534 |
|
|
|
535 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
536 |
|
|
} |
537 |
|
|
}; |
538 |
|
|
|
539 |
|
|
struct auth_res_packet : config_packet |
540 |
|
|
{ |
541 |
|
|
rsaid id; |
542 |
|
|
u8 pad1, pad2, pad3; |
543 |
|
|
u8 response_len; // encrypted length |
544 |
|
|
rsaresponse response; |
545 |
|
|
|
546 |
|
|
auth_res_packet (int dst) |
547 |
|
|
{ |
548 |
|
|
config_packet::setup (PT_AUTH_RES, dst); |
549 |
|
|
|
550 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
551 |
|
|
} |
552 |
|
|
}; |
553 |
|
|
|
554 |
|
|
struct connect_req_packet : vpn_packet |
555 |
|
|
{ |
556 |
|
|
u8 id, protocols; |
557 |
|
|
u8 pad1, pad2; |
558 |
|
|
|
559 |
|
|
connect_req_packet (int dst, int id_, u8 protocols_) |
560 |
|
|
: id(id_) |
561 |
|
|
, protocols(protocols_) |
562 |
|
|
{ |
563 |
|
|
set_hdr (PT_CONNECT_REQ, dst); |
564 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
565 |
|
|
} |
566 |
|
|
}; |
567 |
|
|
|
568 |
|
|
struct connect_info_packet : vpn_packet |
569 |
|
|
{ |
570 |
|
|
u8 id, protocols; |
571 |
|
|
u8 pad1, pad2; |
572 |
|
|
sockinfo si; |
573 |
|
|
|
574 |
|
|
connect_info_packet (int dst, int id_, const sockinfo &si_, u8 protocols_) |
575 |
|
|
: id(id_) |
576 |
|
|
, protocols(protocols_) |
577 |
|
|
, si(si_) |
578 |
|
|
{ |
579 |
|
|
set_hdr (PT_CONNECT_INFO, dst); |
580 |
|
|
|
581 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
582 |
|
|
} |
583 |
|
|
}; |
584 |
|
|
|
585 |
|
|
///////////////////////////////////////////////////////////////////////////// |
586 |
|
|
|
587 |
|
|
void |
588 |
pcg |
1.10 |
connection::connection_established () |
589 |
|
|
{ |
590 |
|
|
if (ictx && octx) |
591 |
|
|
{ |
592 |
|
|
connectmode = conf->connectmode; |
593 |
|
|
|
594 |
|
|
rekey.start (NOW + ::conf.rekey); |
595 |
|
|
keepalive.start (NOW + ::conf.keepalive); |
596 |
|
|
|
597 |
|
|
// send queued packets |
598 |
|
|
if (ictx && octx) |
599 |
pcg |
1.12 |
{ |
600 |
|
|
while (tap_packet *p = (tap_packet *)data_queue.get ()) |
601 |
|
|
{ |
602 |
|
|
send_data_packet (p); |
603 |
|
|
delete p; |
604 |
|
|
} |
605 |
|
|
|
606 |
|
|
while (vpn_packet *p = (vpn_packet *)vpn_queue.get ()) |
607 |
|
|
{ |
608 |
|
|
send_vpn_packet (p, si, IPTOS_RELIABILITY); |
609 |
|
|
delete p; |
610 |
|
|
} |
611 |
|
|
} |
612 |
pcg |
1.10 |
} |
613 |
|
|
else |
614 |
|
|
{ |
615 |
|
|
retry_cnt = 0; |
616 |
|
|
establish_connection.start (NOW + 5); |
617 |
|
|
keepalive.reset (); |
618 |
|
|
rekey.reset (); |
619 |
|
|
} |
620 |
|
|
} |
621 |
|
|
|
622 |
|
|
void |
623 |
pcg |
1.8 |
connection::reset_si () |
624 |
pcg |
1.1 |
{ |
625 |
pcg |
1.6 |
protocol = best_protocol (THISNODE->protocols & conf->protocols); |
626 |
|
|
|
627 |
|
|
// mask out protocols we cannot establish |
628 |
|
|
if (!conf->udp_port) protocol &= ~PROT_UDPv4; |
629 |
|
|
if (!conf->tcp_port) protocol &= ~PROT_TCPv4; |
630 |
|
|
|
631 |
|
|
si.set (conf, protocol); |
632 |
pcg |
1.1 |
} |
633 |
|
|
|
634 |
pcg |
1.8 |
// ensure sockinfo is valid, forward if necessary |
635 |
|
|
const sockinfo & |
636 |
|
|
connection::forward_si (const sockinfo &si) const |
637 |
|
|
{ |
638 |
|
|
if (!si.valid ()) |
639 |
|
|
{ |
640 |
|
|
connection *r = vpn->find_router (); |
641 |
|
|
|
642 |
|
|
if (r) |
643 |
|
|
{ |
644 |
|
|
slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), |
645 |
|
|
conf->nodename, r->conf->nodename); |
646 |
|
|
return r->si; |
647 |
|
|
} |
648 |
|
|
else |
649 |
|
|
slog (L_DEBUG, _("%s: node unreachable, no common protocol"), |
650 |
|
|
conf->nodename); |
651 |
|
|
} |
652 |
|
|
|
653 |
|
|
return si; |
654 |
|
|
} |
655 |
|
|
|
656 |
pcg |
1.1 |
void |
657 |
pcg |
1.10 |
connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
658 |
|
|
{ |
659 |
|
|
if (!vpn->send_vpn_packet (pkt, si, tos)) |
660 |
|
|
reset_connection (); |
661 |
|
|
} |
662 |
|
|
|
663 |
|
|
void |
664 |
pcg |
1.1 |
connection::send_ping (const sockinfo &si, u8 pong) |
665 |
|
|
{ |
666 |
|
|
ping_packet *pkt = new ping_packet; |
667 |
|
|
|
668 |
|
|
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
669 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_LOWDELAY); |
670 |
pcg |
1.1 |
|
671 |
|
|
delete pkt; |
672 |
|
|
} |
673 |
|
|
|
674 |
|
|
void |
675 |
|
|
connection::send_reset (const sockinfo &si) |
676 |
|
|
{ |
677 |
|
|
if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED) |
678 |
|
|
{ |
679 |
|
|
config_packet *pkt = new config_packet; |
680 |
|
|
|
681 |
|
|
pkt->setup (vpn_packet::PT_RESET, conf->id); |
682 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_MINCOST); |
683 |
pcg |
1.1 |
|
684 |
|
|
delete pkt; |
685 |
|
|
} |
686 |
|
|
} |
687 |
|
|
|
688 |
|
|
void |
689 |
|
|
connection::send_auth_request (const sockinfo &si, bool initiate) |
690 |
|
|
{ |
691 |
|
|
auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
692 |
|
|
|
693 |
pcg |
1.6 |
rsachallenge chg; |
694 |
pcg |
1.1 |
|
695 |
pcg |
1.6 |
rsa_cache.gen (pkt->id, chg); |
696 |
pcg |
1.2 |
|
697 |
pcg |
1.6 |
if (0 > RSA_public_encrypt (sizeof chg, |
698 |
|
|
(unsigned char *)&chg, (unsigned char *)&pkt->encr, |
699 |
|
|
conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
700 |
|
|
fatal ("RSA_public_encrypt error"); |
701 |
pcg |
1.1 |
|
702 |
pcg |
1.6 |
slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
703 |
pcg |
1.1 |
|
704 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
705 |
pcg |
1.1 |
|
706 |
pcg |
1.6 |
delete pkt; |
707 |
pcg |
1.1 |
} |
708 |
|
|
|
709 |
|
|
void |
710 |
|
|
connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg) |
711 |
|
|
{ |
712 |
|
|
auth_res_packet *pkt = new auth_res_packet (conf->id); |
713 |
|
|
|
714 |
|
|
pkt->id = id; |
715 |
|
|
|
716 |
|
|
rsa_hash (id, chg, pkt->response); |
717 |
|
|
|
718 |
|
|
pkt->hmac_set (octx); |
719 |
|
|
|
720 |
|
|
slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si); |
721 |
|
|
|
722 |
pcg |
1.10 |
send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly |
723 |
pcg |
1.1 |
|
724 |
|
|
delete pkt; |
725 |
|
|
} |
726 |
|
|
|
727 |
|
|
void |
728 |
|
|
connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols) |
729 |
|
|
{ |
730 |
|
|
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
731 |
|
|
conf->id, rid, (const char *)rsi); |
732 |
|
|
|
733 |
|
|
connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols); |
734 |
|
|
|
735 |
|
|
r->hmac_set (octx); |
736 |
pcg |
1.10 |
send_vpn_packet (r, si); |
737 |
pcg |
1.1 |
|
738 |
|
|
delete r; |
739 |
|
|
} |
740 |
|
|
|
741 |
|
|
void |
742 |
pcg |
1.4 |
connection::establish_connection_cb (time_watcher &w) |
743 |
pcg |
1.1 |
{ |
744 |
|
|
if (ictx || conf == THISNODE |
745 |
|
|
|| connectmode == conf_node::C_NEVER |
746 |
|
|
|| connectmode == conf_node::C_DISABLED) |
747 |
pcg |
1.4 |
w.at = TSTAMP_CANCEL; |
748 |
|
|
else if (w.at <= NOW) |
749 |
pcg |
1.1 |
{ |
750 |
|
|
double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
751 |
|
|
|
752 |
|
|
if (retry_int < 3600 * 8) |
753 |
|
|
retry_cnt++; |
754 |
|
|
|
755 |
pcg |
1.4 |
w.at = NOW + retry_int; |
756 |
pcg |
1.1 |
|
757 |
pcg |
1.8 |
reset_si (); |
758 |
|
|
|
759 |
|
|
if (si.prot && !si.host) |
760 |
pcg |
1.10 |
vpn->send_connect_request (conf->id); |
761 |
pcg |
1.8 |
else |
762 |
pcg |
1.1 |
{ |
763 |
pcg |
1.8 |
const sockinfo &dsi = forward_si (si); |
764 |
pcg |
1.6 |
|
765 |
pcg |
1.8 |
if (dsi.valid () && auth_rate_limiter.can (dsi)) |
766 |
|
|
{ |
767 |
|
|
if (retry_cnt < 4) |
768 |
|
|
send_auth_request (dsi, true); |
769 |
|
|
else |
770 |
|
|
send_ping (dsi, 0); |
771 |
|
|
} |
772 |
pcg |
1.1 |
} |
773 |
|
|
} |
774 |
|
|
} |
775 |
|
|
|
776 |
|
|
void |
777 |
|
|
connection::reset_connection () |
778 |
|
|
{ |
779 |
|
|
if (ictx && octx) |
780 |
|
|
{ |
781 |
|
|
slog (L_INFO, _("%s(%s): connection lost"), |
782 |
|
|
conf->nodename, (const char *)si); |
783 |
|
|
|
784 |
|
|
if (::conf.script_node_down) |
785 |
|
|
run_script (run_script_cb (this, &connection::script_node_down), false); |
786 |
|
|
} |
787 |
|
|
|
788 |
|
|
delete ictx; ictx = 0; |
789 |
|
|
delete octx; octx = 0; |
790 |
|
|
|
791 |
|
|
si.host= 0; |
792 |
|
|
|
793 |
|
|
last_activity = 0; |
794 |
|
|
retry_cnt = 0; |
795 |
|
|
|
796 |
|
|
rekey.reset (); |
797 |
|
|
keepalive.reset (); |
798 |
|
|
establish_connection.reset (); |
799 |
|
|
} |
800 |
|
|
|
801 |
|
|
void |
802 |
|
|
connection::shutdown () |
803 |
|
|
{ |
804 |
|
|
if (ictx && octx) |
805 |
|
|
send_reset (si); |
806 |
|
|
|
807 |
|
|
reset_connection (); |
808 |
|
|
} |
809 |
|
|
|
810 |
|
|
void |
811 |
pcg |
1.4 |
connection::rekey_cb (time_watcher &w) |
812 |
pcg |
1.1 |
{ |
813 |
pcg |
1.4 |
w.at = TSTAMP_CANCEL; |
814 |
pcg |
1.1 |
|
815 |
|
|
reset_connection (); |
816 |
|
|
establish_connection (); |
817 |
|
|
} |
818 |
|
|
|
819 |
|
|
void |
820 |
|
|
connection::send_data_packet (tap_packet *pkt, bool broadcast) |
821 |
|
|
{ |
822 |
|
|
vpndata_packet *p = new vpndata_packet; |
823 |
|
|
int tos = 0; |
824 |
|
|
|
825 |
pcg |
1.12 |
// I am not hilarious about peeking into packets, but so be it. |
826 |
pcg |
1.1 |
if (conf->inherit_tos |
827 |
|
|
&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
828 |
|
|
&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
829 |
|
|
tos = (*pkt)[15] & IPTOS_TOS_MASK; |
830 |
|
|
|
831 |
|
|
p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
832 |
pcg |
1.10 |
send_vpn_packet (p, si, tos); |
833 |
pcg |
1.1 |
|
834 |
|
|
delete p; |
835 |
|
|
|
836 |
|
|
if (oseqno > MAX_SEQNO) |
837 |
|
|
rekey (); |
838 |
|
|
} |
839 |
|
|
|
840 |
|
|
void |
841 |
|
|
connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
842 |
|
|
{ |
843 |
|
|
if (ictx && octx) |
844 |
|
|
send_data_packet (pkt, broadcast); |
845 |
|
|
else |
846 |
|
|
{ |
847 |
|
|
if (!broadcast)//DDDD |
848 |
pcg |
1.12 |
data_queue.put (new tap_packet (*pkt)); |
849 |
pcg |
1.1 |
|
850 |
|
|
establish_connection (); |
851 |
|
|
} |
852 |
|
|
} |
853 |
|
|
|
854 |
pcg |
1.8 |
void connection::inject_vpn_packet (vpn_packet *pkt, int tos) |
855 |
|
|
{ |
856 |
|
|
if (ictx && octx) |
857 |
pcg |
1.10 |
send_vpn_packet (pkt, si, tos); |
858 |
pcg |
1.8 |
else |
859 |
pcg |
1.12 |
{ |
860 |
|
|
vpn_queue.put (new vpn_packet (*pkt)); |
861 |
|
|
|
862 |
|
|
establish_connection (); |
863 |
|
|
} |
864 |
pcg |
1.8 |
} |
865 |
|
|
|
866 |
pcg |
1.1 |
void |
867 |
|
|
connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
868 |
|
|
{ |
869 |
|
|
last_activity = NOW; |
870 |
|
|
|
871 |
|
|
slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
872 |
|
|
conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
873 |
|
|
|
874 |
|
|
switch (pkt->typ ()) |
875 |
|
|
{ |
876 |
pcg |
1.3 |
case vpn_packet::PT_PING: |
877 |
|
|
// we send pings instead of auth packets after some retries, |
878 |
|
|
// so reset the retry counter and establish a connection |
879 |
|
|
// when we receive a ping. |
880 |
|
|
if (!ictx) |
881 |
|
|
{ |
882 |
|
|
if (auth_rate_limiter.can (rsi)) |
883 |
|
|
send_auth_request (rsi, true); |
884 |
|
|
} |
885 |
|
|
else |
886 |
|
|
send_ping (rsi, 1); // pong |
887 |
|
|
|
888 |
|
|
break; |
889 |
|
|
|
890 |
|
|
case vpn_packet::PT_PONG: |
891 |
|
|
break; |
892 |
|
|
|
893 |
|
|
case vpn_packet::PT_RESET: |
894 |
pcg |
1.1 |
{ |
895 |
pcg |
1.3 |
reset_connection (); |
896 |
|
|
|
897 |
|
|
config_packet *p = (config_packet *) pkt; |
898 |
|
|
|
899 |
|
|
if (!p->chk_config ()) |
900 |
|
|
{ |
901 |
|
|
slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"), |
902 |
|
|
conf->nodename, (const char *)rsi); |
903 |
|
|
connectmode = conf_node::C_DISABLED; |
904 |
|
|
} |
905 |
|
|
else if (connectmode == conf_node::C_ALWAYS) |
906 |
|
|
establish_connection (); |
907 |
pcg |
1.1 |
} |
908 |
pcg |
1.3 |
break; |
909 |
|
|
|
910 |
|
|
case vpn_packet::PT_AUTH_REQ: |
911 |
|
|
if (auth_rate_limiter.can (rsi)) |
912 |
|
|
{ |
913 |
|
|
auth_req_packet *p = (auth_req_packet *) pkt; |
914 |
|
|
|
915 |
|
|
slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate); |
916 |
pcg |
1.1 |
|
917 |
pcg |
1.3 |
if (p->chk_config () && !strncmp (p->magic, MAGIC, 8)) |
918 |
|
|
{ |
919 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
920 |
|
|
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
921 |
|
|
conf->nodename, (const char *)rsi, |
922 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
923 |
|
|
|
924 |
|
|
if (p->initiate) |
925 |
|
|
send_auth_request (rsi, false); |
926 |
|
|
|
927 |
|
|
rsachallenge k; |
928 |
|
|
|
929 |
|
|
if (0 > RSA_private_decrypt (sizeof (p->encr), |
930 |
|
|
(unsigned char *)&p->encr, (unsigned char *)&k, |
931 |
|
|
::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
932 |
pcg |
1.17 |
slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
933 |
|
|
conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
934 |
pcg |
1.3 |
else |
935 |
|
|
{ |
936 |
|
|
delete octx; |
937 |
pcg |
1.1 |
|
938 |
pcg |
1.3 |
octx = new crypto_ctx (k, 1); |
939 |
|
|
oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
940 |
pcg |
1.1 |
|
941 |
pcg |
1.3 |
conf->protocols = p->protocols; |
942 |
pcg |
1.10 |
|
943 |
pcg |
1.3 |
send_auth_response (rsi, p->id, k); |
944 |
|
|
|
945 |
pcg |
1.10 |
connection_established (); |
946 |
|
|
|
947 |
pcg |
1.3 |
break; |
948 |
|
|
} |
949 |
|
|
} |
950 |
pcg |
1.15 |
else |
951 |
|
|
slog (L_WARN, _("%s(%s): protocol mismatch"), |
952 |
|
|
conf->nodename, (const char *)rsi); |
953 |
pcg |
1.3 |
|
954 |
|
|
send_reset (rsi); |
955 |
pcg |
1.1 |
} |
956 |
|
|
|
957 |
pcg |
1.3 |
break; |
958 |
|
|
|
959 |
|
|
case vpn_packet::PT_AUTH_RES: |
960 |
pcg |
1.1 |
{ |
961 |
pcg |
1.3 |
auth_res_packet *p = (auth_res_packet *) pkt; |
962 |
pcg |
1.1 |
|
963 |
pcg |
1.3 |
slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id); |
964 |
pcg |
1.1 |
|
965 |
pcg |
1.3 |
if (p->chk_config ()) |
966 |
pcg |
1.1 |
{ |
967 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
968 |
|
|
slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."), |
969 |
|
|
conf->nodename, (const char *)rsi, |
970 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
971 |
|
|
|
972 |
pcg |
1.3 |
rsachallenge chg; |
973 |
pcg |
1.1 |
|
974 |
pcg |
1.3 |
if (!rsa_cache.find (p->id, chg)) |
975 |
pcg |
1.13 |
{ |
976 |
pcg |
1.18 |
slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
977 |
pcg |
1.13 |
conf->nodename, (const char *)rsi); |
978 |
|
|
break; |
979 |
|
|
} |
980 |
pcg |
1.1 |
else |
981 |
|
|
{ |
982 |
pcg |
1.3 |
crypto_ctx *cctx = new crypto_ctx (chg, 0); |
983 |
|
|
|
984 |
|
|
if (!p->hmac_chk (cctx)) |
985 |
pcg |
1.18 |
{ |
986 |
|
|
slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
987 |
|
|
"could be an attack, or just corruption or an synchronization error"), |
988 |
|
|
conf->nodename, (const char *)rsi); |
989 |
|
|
break; |
990 |
|
|
} |
991 |
pcg |
1.3 |
else |
992 |
|
|
{ |
993 |
|
|
rsaresponse h; |
994 |
|
|
|
995 |
|
|
rsa_hash (p->id, chg, h); |
996 |
|
|
|
997 |
|
|
if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h)) |
998 |
|
|
{ |
999 |
|
|
prot_minor = p->prot_minor; |
1000 |
|
|
|
1001 |
|
|
delete ictx; ictx = cctx; |
1002 |
|
|
|
1003 |
|
|
iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
1004 |
|
|
|
1005 |
|
|
si = rsi; |
1006 |
pcg |
1.7 |
protocol = rsi.prot; |
1007 |
pcg |
1.3 |
|
1008 |
pcg |
1.10 |
connection_established (); |
1009 |
pcg |
1.1 |
|
1010 |
pcg |
1.7 |
slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), |
1011 |
pcg |
1.3 |
conf->nodename, (const char *)rsi, |
1012 |
|
|
p->prot_major, p->prot_minor); |
1013 |
pcg |
1.1 |
|
1014 |
pcg |
1.3 |
if (::conf.script_node_up) |
1015 |
|
|
run_script (run_script_cb (this, &connection::script_node_up), false); |
1016 |
pcg |
1.1 |
|
1017 |
pcg |
1.3 |
break; |
1018 |
|
|
} |
1019 |
|
|
else |
1020 |
|
|
slog (L_ERR, _("%s(%s): sent and received challenge do not match"), |
1021 |
|
|
conf->nodename, (const char *)rsi); |
1022 |
|
|
} |
1023 |
pcg |
1.1 |
|
1024 |
pcg |
1.3 |
delete cctx; |
1025 |
pcg |
1.1 |
} |
1026 |
|
|
} |
1027 |
|
|
} |
1028 |
|
|
|
1029 |
pcg |
1.3 |
send_reset (rsi); |
1030 |
|
|
break; |
1031 |
pcg |
1.1 |
|
1032 |
pcg |
1.3 |
case vpn_packet::PT_DATA_COMPRESSED: |
1033 |
|
|
#if !ENABLE_COMPRESSION |
1034 |
|
|
send_reset (rsi); |
1035 |
|
|
break; |
1036 |
|
|
#endif |
1037 |
pcg |
1.1 |
|
1038 |
pcg |
1.3 |
case vpn_packet::PT_DATA_UNCOMPRESSED: |
1039 |
pcg |
1.1 |
|
1040 |
pcg |
1.3 |
if (ictx && octx) |
1041 |
pcg |
1.1 |
{ |
1042 |
pcg |
1.3 |
vpndata_packet *p = (vpndata_packet *)pkt; |
1043 |
pcg |
1.1 |
|
1044 |
pcg |
1.10 |
if (!p->hmac_chk (ictx)) |
1045 |
|
|
slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1046 |
|
|
"could be an attack, or just corruption or an synchronization error"), |
1047 |
|
|
conf->nodename, (const char *)rsi); |
1048 |
|
|
else |
1049 |
pcg |
1.1 |
{ |
1050 |
pcg |
1.10 |
u32 seqno; |
1051 |
|
|
tap_packet *d = p->unpack (this, seqno); |
1052 |
|
|
|
1053 |
|
|
if (iseqno.recv_ok (seqno)) |
1054 |
pcg |
1.1 |
{ |
1055 |
pcg |
1.10 |
vpn->tap->send (d); |
1056 |
|
|
|
1057 |
|
|
if (p->dst () == 0) // re-broadcast |
1058 |
|
|
for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
1059 |
|
|
{ |
1060 |
|
|
connection *c = *i; |
1061 |
|
|
|
1062 |
|
|
if (c->conf != THISNODE && c->conf != conf) |
1063 |
|
|
c->inject_data_packet (d); |
1064 |
|
|
} |
1065 |
pcg |
1.1 |
|
1066 |
pcg |
1.10 |
if (si != rsi) |
1067 |
pcg |
1.1 |
{ |
1068 |
pcg |
1.14 |
// fast re-sync on connection changes, useful especially for tcp/ip |
1069 |
pcg |
1.10 |
si = rsi; |
1070 |
pcg |
1.1 |
|
1071 |
pcg |
1.10 |
slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1072 |
|
|
conf->nodename, (const char *)si, (const char *)rsi); |
1073 |
|
|
} |
1074 |
pcg |
1.3 |
|
1075 |
pcg |
1.10 |
delete d; |
1076 |
pcg |
1.1 |
|
1077 |
pcg |
1.10 |
break; |
1078 |
pcg |
1.1 |
} |
1079 |
|
|
} |
1080 |
|
|
} |
1081 |
|
|
|
1082 |
pcg |
1.3 |
send_reset (rsi); |
1083 |
|
|
break; |
1084 |
pcg |
1.1 |
|
1085 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_REQ: |
1086 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1087 |
|
|
{ |
1088 |
|
|
connect_req_packet *p = (connect_req_packet *) pkt; |
1089 |
pcg |
1.1 |
|
1090 |
pcg |
1.3 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1091 |
pcg |
1.7 |
connection *c = vpn->conns[p->id - 1]; |
1092 |
pcg |
1.3 |
conf->protocols = p->protocols; |
1093 |
pcg |
1.1 |
|
1094 |
pcg |
1.3 |
slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1095 |
|
|
conf->id, p->id, c->ictx && c->octx); |
1096 |
pcg |
1.1 |
|
1097 |
pcg |
1.3 |
if (c->ictx && c->octx) |
1098 |
|
|
{ |
1099 |
|
|
// send connect_info packets to both sides, in case one is |
1100 |
|
|
// behind a nat firewall (or both ;) |
1101 |
|
|
c->send_connect_info (conf->id, si, conf->protocols); |
1102 |
|
|
send_connect_info (c->conf->id, c->si, c->conf->protocols); |
1103 |
|
|
} |
1104 |
pcg |
1.11 |
else |
1105 |
|
|
c->establish_connection (); |
1106 |
pcg |
1.3 |
} |
1107 |
pcg |
1.1 |
|
1108 |
pcg |
1.3 |
break; |
1109 |
pcg |
1.1 |
|
1110 |
pcg |
1.3 |
case vpn_packet::PT_CONNECT_INFO: |
1111 |
|
|
if (ictx && octx && rsi == si && pkt->hmac_chk (ictx)) |
1112 |
|
|
{ |
1113 |
|
|
connect_info_packet *p = (connect_info_packet *) pkt; |
1114 |
pcg |
1.1 |
|
1115 |
pcg |
1.3 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1116 |
pcg |
1.7 |
|
1117 |
pcg |
1.3 |
connection *c = vpn->conns[p->id - 1]; |
1118 |
pcg |
1.1 |
|
1119 |
pcg |
1.7 |
c->conf->protocols = p->protocols; |
1120 |
|
|
protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf)); |
1121 |
|
|
p->si.upgrade_protocol (protocol, c->conf); |
1122 |
|
|
|
1123 |
pcg |
1.3 |
slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1124 |
|
|
conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1125 |
pcg |
1.1 |
|
1126 |
pcg |
1.8 |
const sockinfo &dsi = forward_si (p->si); |
1127 |
|
|
|
1128 |
|
|
if (dsi.valid ()) |
1129 |
|
|
c->send_auth_request (dsi, true); |
1130 |
pcg |
1.3 |
} |
1131 |
pcg |
1.1 |
|
1132 |
pcg |
1.3 |
break; |
1133 |
pcg |
1.1 |
|
1134 |
pcg |
1.3 |
default: |
1135 |
|
|
send_reset (rsi); |
1136 |
|
|
break; |
1137 |
pcg |
1.1 |
} |
1138 |
|
|
} |
1139 |
|
|
|
1140 |
pcg |
1.4 |
void connection::keepalive_cb (time_watcher &w) |
1141 |
pcg |
1.1 |
{ |
1142 |
|
|
if (NOW >= last_activity + ::conf.keepalive + 30) |
1143 |
|
|
{ |
1144 |
|
|
reset_connection (); |
1145 |
|
|
establish_connection (); |
1146 |
|
|
} |
1147 |
|
|
else if (NOW < last_activity + ::conf.keepalive) |
1148 |
pcg |
1.4 |
w.at = last_activity + ::conf.keepalive; |
1149 |
pcg |
1.1 |
else if (conf->connectmode != conf_node::C_ONDEMAND |
1150 |
|
|
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
1151 |
|
|
{ |
1152 |
|
|
send_ping (si); |
1153 |
pcg |
1.4 |
w.at = NOW + 5; |
1154 |
pcg |
1.1 |
} |
1155 |
pcg |
1.12 |
else if (NOW < last_activity + ::conf.keepalive + 10) |
1156 |
|
|
// hold ondemand connections implicitly a few seconds longer |
1157 |
|
|
// should delete octx, though, or something like that ;) |
1158 |
|
|
w.at = last_activity + ::conf.keepalive + 10; |
1159 |
pcg |
1.1 |
else |
1160 |
|
|
reset_connection (); |
1161 |
|
|
} |
1162 |
|
|
|
1163 |
pcg |
1.10 |
void connection::send_connect_request (int id) |
1164 |
pcg |
1.1 |
{ |
1165 |
|
|
connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols); |
1166 |
|
|
|
1167 |
|
|
slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id); |
1168 |
|
|
p->hmac_set (octx); |
1169 |
pcg |
1.10 |
send_vpn_packet (p, si); |
1170 |
pcg |
1.1 |
|
1171 |
|
|
delete p; |
1172 |
|
|
} |
1173 |
|
|
|
1174 |
|
|
void connection::script_node () |
1175 |
|
|
{ |
1176 |
pcg |
1.3 |
vpn->script_if_up (); |
1177 |
pcg |
1.1 |
|
1178 |
|
|
char *env; |
1179 |
|
|
asprintf (&env, "DESTID=%d", conf->id); putenv (env); |
1180 |
|
|
asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); |
1181 |
|
|
asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); |
1182 |
|
|
asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); |
1183 |
|
|
} |
1184 |
|
|
|
1185 |
pcg |
1.3 |
const char *connection::script_node_up () |
1186 |
pcg |
1.1 |
{ |
1187 |
|
|
script_node (); |
1188 |
|
|
|
1189 |
|
|
putenv ("STATE=up"); |
1190 |
|
|
|
1191 |
|
|
return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1192 |
|
|
} |
1193 |
|
|
|
1194 |
pcg |
1.3 |
const char *connection::script_node_down () |
1195 |
pcg |
1.1 |
{ |
1196 |
|
|
script_node (); |
1197 |
|
|
|
1198 |
|
|
putenv ("STATE=down"); |
1199 |
|
|
|
1200 |
|
|
return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1201 |
|
|
} |
1202 |
|
|
|
1203 |
|
|
connection::connection(struct vpn *vpn_) |
1204 |
|
|
: vpn(vpn_) |
1205 |
|
|
, rekey (this, &connection::rekey_cb) |
1206 |
|
|
, keepalive (this, &connection::keepalive_cb) |
1207 |
|
|
, establish_connection (this, &connection::establish_connection_cb) |
1208 |
|
|
{ |
1209 |
|
|
octx = ictx = 0; |
1210 |
|
|
retry_cnt = 0; |
1211 |
|
|
|
1212 |
|
|
connectmode = conf_node::C_ALWAYS; // initial setting |
1213 |
|
|
reset_connection (); |
1214 |
|
|
} |
1215 |
|
|
|
1216 |
|
|
connection::~connection () |
1217 |
|
|
{ |
1218 |
|
|
shutdown (); |
1219 |
|
|
} |
1220 |
|
|
|
1221 |
|
|
void connection_init () |
1222 |
|
|
{ |
1223 |
|
|
auth_rate_limiter.clear (); |
1224 |
|
|
reset_rate_limiter.clear (); |
1225 |
|
|
} |
1226 |
|
|
|