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Comparing gvpe/src/connection.C (file contents):
Revision 1.50 by pcg, Fri Mar 18 01:53:05 2005 UTC vs.
Revision 1.112 by root, Fri Sep 12 10:40:43 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <cassert>
25
26	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
27		37
		38	#include <openssl/opensslv.h>
28	#include <openssl/rand.h>	39	#include <openssl/rand.h>
29	#include <openssl/evp.h>	40	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
31	#include <openssl/err.h>	42	#include <openssl/err.h>
		43
		44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) require (exp)
		49	#endif
32		50
33	#include "conf.h"	51	#include "conf.h"
34	#include "slog.h"	52	#include "slog.h"
35	#include "device.h"	53	#include "device.h"
36	#include "vpn.h"	54	#include "vpn.h"
37	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
38		57
39	#include "netcompat.h"	58	#include "netcompat.h"
40		59
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
46		61
47	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
48	#define HLOG 15	63	#define HLOG 15
49	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
52		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb *cb, const char *warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
		111
53	struct crypto_ctx	112	struct crypto_ctx
54	{	113	{
55	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	115	HMAC_CTX hctx;
57		116
58	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	118	~crypto_ctx ();
60	};	119	};
61		120
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
64	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	153	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	154	}
69		155
70	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
71	{	157	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
74	}	160	}
75		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
76	static void	189	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	191	{
79	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	196	}
88		197
89	struct rsa_entry {	198	void
90	tstamp expire;	199	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	200	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		206
139	} rsa_cache;	207	// eventual response data
140		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	209	}
145	w.start (NOW + RSA_TTL);
146		210
147	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
148	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	213	}
154		214
155	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
156		216
157	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
158	{	219	{
159	if (queue[i])	220	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		221
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	222	i = 0;
187	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	226	}
189		227
190	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
191	{	229	{
192	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
193	delete queue[i];	233	delete [] queue;
194	}	234	}
195		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
		290	}
		291
196	struct net_rateinfo {	292	struct net_rateinfo
		293	{
197	u32 host;	294	u32 host;
198	double pcnt, diff;	295	double pcnt, diff;
199	tstamp last;	296	tstamp last;
200	};	297	};
201		298
…		…
211		308
212	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	310	bool can (u32 host);
214	};	311	};
215		312
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		314
		315	bool
218	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
219	{	317	{
220	iterator i;	318	iterator i;
221		319
222	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
223	if (i->host == host)	321	if (i->host == host)
224	break;	322	break;
225	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	324	i = erase (i);
227	else	325	else
228	i++;	326	i++;
229		327
230	if (i == end ())	328	if (i == end ())
…		…
232	net_rateinfo ri;	330	net_rateinfo ri;
233		331
234	ri.host = host;	332	ri.host = host;
235	ri.pcnt = 1.;	333	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	335	ri.last = ev_now ();
238		336
239	push_front (ri);	337	push_front (ri);
240		338
241	return true;	339	return true;
242	}	340	}
…		…
244	{	342	{
245	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
246	erase (i);	344	erase (i);
247		345
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		348
251	ri.last = NOW;	349	ri.last = ev_now ();
252		350
253	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
254		352
255	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
256		354
…		…
268	}	366	}
269	}	367	}
270		368
271	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
272		370
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	373	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
280		375
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	379	}
286		380
287	void	381	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	383	{
290	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		385	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	387	}
294		388
295	bool	389	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	391	{
298	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		393	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	395	}
302		396
		397	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	399	{
305	type = type_;	400	type = type_;
306		401
307	int src = THISNODE->id;	402	int src = THISNODE->id;
308		403
…		…
313		408
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		411
317	struct vpndata_packet : vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
318	{	421	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	423	}
		424	};
330		425
331	void	426	void
332	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
333	{	428	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
337		432
338	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
340		435
341	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
342	{	437	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		439
345	if (cl)	440	if (cl)
346	{	441	{
…		…
352	d[1] = cl;	447	d[1] = cl;
353	}	448	}
354	}	449	}
355	#endif	450	#endif
356		451
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		453
359	struct {	454	struct {
360	#if RAND_SIZE	455	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
362	#endif	457	#endif
363	u32 seqno;	458	u32 seqno;
364	} datahdr;	459	} datahdr;
365		460
366	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	462	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	// NB: a constant (per session) random prefix
		464	// is likely enough, but we don't take any chances.
		465	conn->oiv.get (datahdr.rnd, RAND_SIZE);
369	#endif	466	#endif
370		467
371	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	492	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
397	u8 *d;	494	u8 *d;
398	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
399		496
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		498
402	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
404		501
405	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	503	d = cdata;
407	else	504	else
408	#endif	505	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
410		507
411	/* this overwrites part of the src mac, but we fix that later */	508	// we play do evil games with the struct layout atm.
		509	// pending better solutions, we at least do some verification.
		510	// this is fine, as we left ISO territory long ago.
		511	require (DATAHDR <= 16);
		512	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		513
		514	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	516	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	518	outl += outl2;
416		519
…		…
447	}	550	}
448	};	551	};
449		552
450	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
451	{	554	{
452	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
458		559
459	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
460	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		562
462	static u8 get_features ()	563	static u8 get_features ()
463	{	564	{
464	u8 f = 0;	565	u8 f = 0;
465	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
466	f |= FEATURE_COMPRESSION;	567	f |= FEATURE_COMPRESSION;
467	#endif	568	#endif
468	#if ENABLE_ROHC	569	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	570	f |= FEATURE_ROHC;
470	#endif	571	#endif
		572	#if ENABLE_BRIDGING
		573	f |= FEATURE_BRIDGING;
		574	#endif
471	return f;	575	return f;
472	}	576	}
473	};	577	};
474		578
		579	void
475	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
476	{	581	{
477	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;
481	flags = 0;	585	flags = 0;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	586	features = get_features ();
484		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		593
489	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	595	set_hdr (type, dst);
491	}	596	}
492		597
493	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	600	{
495	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
499	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	else if (challengelen != sizeof (rsachallenge))
502	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
503	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
504	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	608	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
505	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
506	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
507	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
508	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	611	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		613	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		614	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		615	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
509	else	616	else
		617	{
		618	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		619
		620	if (cmp > 0)
		621	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		622	conf->nodename, (const char *)rsi);
		623	else if (cmp == 0)
510	return true;	624	return true;
		625	}
511		626
512	return false;	627	return false;
513	}	628	}
514		629
515	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
516	{	631	{
517	char magic[8];	632	char magic[8];
518	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
519	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
520	u8 pad2, pad3;	635	u8 pad2, pad3;
521	rsaid id;	636	auth_encr encr;
522	rsaencrdata encr;
523		637
524	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
525	{	639	{
526	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
527	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
528	initiate = !!initiate_;	642	initiate = !!initiate_;
529	protocols = protocols_;	643	protocols = protocols_;
530		644
531	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
532	}	646	}
533	};	647	};
534		648
535	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
536	{	650	{
537	rsaid id;
538	u8 pad1, pad2, pad3;
539	u8 response_len; // encrypted length
540	rsaresponse response;	651	auth_response response;
541		652
542	auth_res_packet (int dst)	653	auth_res_packet (int dst)
543	{	654	{
544	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
545		656
546	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
547	}	658	}
548	};	659	};
549		660
…		…
579	};	690	};
580		691
581	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
582		693
583	void	694	void
584	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
585	{	696	{
586	if (ictx && octx)	697	if (!have_snd_auth || !have_rcv_auth)
		698	return;
		699
		700	si = rsi;
		701	protocol = rsi.prot;
		702
		703	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		704	conf->nodename, (const char *)rsi,
		705	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		706	PROTOCOL_MAJOR, prot_minor);
		707
		708	if (::conf.script_node_up)
		709	{
		710	run_script_cb *cb = new run_script_cb;
		711	cb->set<connection, &connection::script_node_up> (this);
		712	run_script_queued (cb, _("node-up command execution failed, continuing."));
587	{	713	}
588	connectmode = conf->connectmode;	714
		715	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		716	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
589		717
		718	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		719	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		720
		721	oiv.reset ();
		722
590	// make sure rekeying timeouts are slightly asymmetric	723	// make sure rekeying timeouts are slightly asymmetric
591	rekey.start (NOW + ::conf.rekey	724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
592	+ (conf->id > THISNODE->id ? 10 : 0));	725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
593	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
594		730
595	// send queued packets	731	// send queued packets
596	if (ictx && octx)
597	{
598	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
599	{	733	{
600	send_data_packet (p);	734	if (p->len) send_data_packet (p);
601	delete p;	735	delete p;
602	}	736	}
603		737
604	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
605	{	739	{
606	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
607	delete p;	741	delete p;
608	}
609	}
610	}	742	}
		743
		744	vpn->connection_established (this);
		745	}
		746
		747	void
		748	connection::reset_si ()
		749	{
		750	if (vpn->can_direct (THISNODE, conf))
		751	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
611	else	752	else
612	{	753	{
613	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
614	establish_connection.start (NOW + 5);	755	protocol = 0;
615	keepalive.stop ();
616	rekey.stop ();
617	}	756	}
618	}
619
620	void
621	connection::reset_si ()
622	{
623	protocol = best_protocol (THISNODE->protocols & conf->protocols);
624
625	// mask out protocols we cannot establish
626	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
627	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
628	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
629		757
630	si.set (conf, protocol);	758	si.set (conf, protocol);
631	}	759	}
632		760
633	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
634	const sockinfo &	762	const sockinfo &
635	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
636	{	764	{
637	if (!si.valid ())	765	if (!si.valid ())
638	{	766	{
639	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
640		768
641	if (r)	769	if (r)
642	{	770	{
643	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
644	conf->nodename, r->conf->nodename, (const char *)r->si);	772	conf->nodename, r->conf->nodename);
645	return r->si;	773	return r->si;
646	}	774	}
647	else	775	else
648	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
649	conf->nodename);	777	conf->nodename);
650	}	778	}
651		779
652	return si;	780	return si;
653	}	781	}
654		782
655	void	783	void
656	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	784	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
657	{	785	{
658	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
659	reset_connection ();	787	reset_connection ("packet send error");
660	}	788	}
661		789
662	void	790	void
663	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
664	{	792	{
665	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
666		794
667	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	795	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		796
		797	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
668	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
669		799
670	delete pkt;	800	delete pkt;
671	}	801	}
672		802
…		…
687	void	817	void
688	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
689	{	819	{
690	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	820	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
691		821
692	rsachallenge chg;	822	generate_auth_data ();
693	rsa_cache.gen (pkt->id, chg);
694	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
695		824
696	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	825	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
697
698	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	826	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
699		827
700	delete pkt;	828	delete pkt;
701	}	829	}
702		830
703	void	831	void
704	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
705	{	833	{
706	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
707		835
708	pkt->id = id;	836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		837	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
709		838
710	rsa_hash (id, chg, pkt->response);
711
712	pkt->hmac_set (octx);
713
714	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	839	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
715
716	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	840	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
717		841
718	delete pkt;	842	delete pkt;
719	}	843	}
720		844
721	void	845	void
722	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
723	{	847	{
724	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
725	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
726		851
727	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	852	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
728		853
729	r->hmac_set (octx);	854	r->hmac_set (octx);
730	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
731		856
732	delete r;	857	delete r;
733	}	858	}
734		859
735	void	860	inline void
736	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
737	{	862	{
738	if (!ictx	863	if (!(ictx && octx)
739	&& conf != THISNODE	864	&& conf != THISNODE
740	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
741	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
742	&& NOW > w.at)	867	&& !w.is_active ())
743	{	868	{
744	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		870	// and stop trying. should probably be handled by a per-connection expire handler.
		871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
		874	return;
		875	}
745		876
746	double retry_int = double (retry_cnt & 3	877	last_establish_attempt = ev_now ();
		878
		879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
747	? (retry_cnt & 3) + 1	880	? (retry_cnt & 3) + 1
748	: 1 << (retry_cnt >> 2));	881	: 1 << (retry_cnt >> 2));
749		882
750	reset_si ();	883	reset_si ();
751		884
752	bool slow = si.prot & PROT_SLOW;	885	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
753		886
754	if (si.prot && !si.host)	887	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		888	{
		889	/*TODO*/ /* start the timer so we don't recurse endlessly */
		890	w.start (1);
755	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
756	else	893	else
757	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
758	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
759		900
760	slow = slow || (dsi.prot & PROT_SLOW);	901	slow = slow || (dsi.prot & PROT_SLOW);
761		902
762	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
763	{	904	{
764	if (retry_cnt < 4)	905	// use ping after the first few retries
		906	// TODO: on rekeys, the other node might not interpret ping correctly,
		907	// TODO: as it will still have a valid connection
		908	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
765	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
766	else	910	else
767	send_ping (dsi, 0);	911	send_ping (dsi, 0);
768	}	912	}
769	}	913	}
770		914
771	retry_int *= slow ? 8. : 0.7;	915	retry_int *= slow ? 4. : 0.9;
772		916
773	if (retry_int < conf->max_retry)	917	if (retry_int < conf->max_retry)
774	retry_cnt++;	918	retry_cnt++;
775	else	919	else
776	retry_int = conf->max_retry;	920	retry_int = conf->max_retry;
777		921
778	w.start (NOW + retry_int);	922	w.start (retry_int);
779	}	923	}
780	}	924	}
781		925
782	void	926	void
783	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
784	{	928	{
785	if (ictx && octx)	929	if (ictx && octx)
786	{	930	{
787	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
788	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
789		933
790	if (::conf.script_node_down)	934	if (::conf.script_node_down)
791	run_script (run_script_cb (this, &connection::script_node_down), false);	935	{
		936	run_script_cb *cb = new run_script_cb;
		937	cb->set<connection, &connection::script_node_down> (this);
		938	run_script_queued (cb, _("node-down command execution failed, continuing."));
		939	}
792	}	940	}
793		941
794	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
795	delete octx; octx = 0;	943	delete octx; octx = 0;
796	#if ENABLE_DNS
797	dnsv4_reset_connection ();
798	#endif
799		944
800	si.host = 0;	945	si.host = 0;
801		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
802	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
803	retry_cnt = 0;	953	retry_cnt = 0;
804		954
805	rekey.stop ();	955	rekey.stop ();
806	keepalive.stop ();	956	keepalive.stop ();
807	establish_connection.stop ();	957	establish_connection.stop ();
…		…
811	connection::shutdown ()	961	connection::shutdown ()
812	{	962	{
813	if (ictx && octx)	963	if (ictx && octx)
814	send_reset (si);	964	send_reset (si);
815		965
816	reset_connection ();	966	reset_connection ("shutdown");
817	}	967	}
818		968
819	void	969	// poor-man's rekeying
820	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
821	{	972	{
822	reset_connection ();	973	reset_connection ("rekeying");
823	establish_connection ();	974	establish_connection ();
824	}	975	}
825		976
826	void	977	void
827	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
841	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
842	rekey ();	993	rekey ();
843	}	994	}
844		995
845	void	996	void
		997	connection::post_inject_queue ()
		998	{
		999	// force a connection every now and when when packets are sent (max 1/s)
		1000	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1001	establish_connection.stop ();
		1002
		1003	establish_connection ();
		1004	}
		1005
		1006	void
846	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
847	{	1008	{
848	if (ictx && octx)	1009	if (ictx && octx)
849	send_data_packet (pkt);	1010	send_data_packet (pkt);
850	else	1011	else
851	{	1012	{
852	if (!broadcast)//DDDD
853	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
854		1014	post_inject_queue ();
855	establish_connection ();
856	}	1015	}
857	}	1016	}
858		1017
		1018	void
859	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
860	{	1020	{
861	if (ictx && octx)	1021	if (ictx && octx)
862	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
863	else	1023	else
864	{	1024	{
865	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
866		1026	post_inject_queue ();
867	establish_connection ();
868	}	1027	}
869	}	1028	}
870		1029
871	void	1030	void
872	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
873	{	1032	{
874	last_activity = NOW;	1033	last_activity = ev_now ();
875		1034
876	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1035	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
877	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1036	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1037
		1038	if (connectmode == conf_node::C_DISABLED)
		1039	return;
878		1040
879	switch (pkt->typ ())	1041	switch (pkt->typ ())
880	{	1042	{
881	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
882	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
883	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
884	// when we receive a ping.	1048	// when we receive a ping.
885	if (!ictx)	1049	if (!ictx)
886	{	1050	{
887	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
888	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
889	}	1053	}
890	else	1054	else
		1055	// we would love to change the socket address here, but ping's aren't
		1056	// authenticated, so we best ignore it.
891	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
892		1058
893	break;	1059	break;
894		1060
895	case vpn_packet::PT_PONG:	1061	case vpn_packet::PT_PONG:
		1062	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1063
		1064	// a PONG might mean that the other side doesn't really know
		1065	// about our desire for communication.
		1066	establish_connection ();
896	break;	1067	break;
897		1068
898	case vpn_packet::PT_RESET:	1069	case vpn_packet::PT_RESET:
		1070	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1071
		1072	if (ictx && octx)
899	{	1073	{
900	reset_connection ();	1074	reset_connection ("remote reset");
901		1075
902	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
903		1077
904	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
905	{
906	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
907	conf->nodename, (const char *)rsi);
908	connectmode = conf_node::C_DISABLED;
909	}
910	else if (connectmode == conf_node::C_ALWAYS)
911	establish_connection ();	1079	establish_connection ();
912	}	1080	}
		1081
913	break;	1082	break;
914		1083
915	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
916	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
917	{	1086	{
918	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
919		1088
920	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1089	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1090	conf->nodename, p->initiate ? "initiate" : "reply",
		1091	p->protocols, p->features);
921		1092
922	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1093	if (memcmp (p->magic, MAGIC, 8))
		1094	{
		1095	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1096	conf->nodename, (const char *)rsi);
		1097	}
		1098	else if (p->chk_config (conf, rsi))
923	{	1099	{
924	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
925	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1101	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
926	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
927	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
928		1104
929	if (p->initiate)	1105	if (p->initiate)
		1106	{
930	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
931		1108
932	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
933		1112
		1113	auth_data auth;
		1114
934	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
935	{	1116	{
936	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1117	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
937	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
938	break;
939	}	1119	}
940	else	1120	else
941	{	1121	{
942	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
943		1123
944	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
945	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
946		1126
		1127	send_auth_response (rsi);
		1128
		1129	if (chg)
		1130	{
947	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
948	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
949		1133
950	send_auth_response (rsi, p->id, k);
951
952	connection_established ();	1134	connection_established (rsi);
953
954	break;	1135	}
955	}	1136	}
		1137
		1138	break;
956	}	1139	}
957	else
958	slog (L_WARN, _("%s(%s): protocol mismatch"),
959	conf->nodename, (const char *)rsi);
960		1140
961	send_reset (rsi);	1141	send_reset (rsi);
962	}	1142	}
963		1143
964	break;	1144	break;
965		1145
966	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
967	{	1147	{
968	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
969		1149
970	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
971		1151
972	if (p->chk_config ())	1152	auth_mac local_mac;
		1153	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1154
		1155	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
973	{	1156	{
974	if (p->prot_minor != PROTOCOL_MINOR)
975	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
976	conf->nodename, (const char *)rsi,
977	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
978
979	rsachallenge chg;
980
981	if (!rsa_cache.find (p->id, chg))
982	{
983	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
984	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
985	break;
986	}	1159	}
987	else	1160	else if (!have_snd_auth)
988	{	1161	{
989	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
990		1163
991	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
992	{
993	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
994	"could be an attack, or just corruption or a synchronization error"),
995	conf->nodename, (const char *)rsi);
996	break;
997	}
998	else
999	{
1000	rsaresponse h;
1001
1002	rsa_hash (p->id, chg, h);
1003
1004	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1005	{
1006	prot_minor = p->prot_minor;
1007
1008	delete ictx; ictx = cctx;
1009
1010	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1011
1012	si = rsi;
1013	protocol = rsi.prot;
1014
1015	connection_established ();	1165	connection_established (rsi);
1016
1017	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1018	conf->nodename, (const char *)rsi,
1019	p->prot_major, p->prot_minor);
1020
1021	if (::conf.script_node_up)
1022	run_script (run_script_cb (this, &connection::script_node_up), false);
1023
1024	break;
1025	}
1026	else
1027	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1028	conf->nodename, (const char *)rsi);
1029	}
1030
1031	delete cctx;
1032	}
1033	}	1166	}
1034	}	1167	}
1035
1036	send_reset (rsi);
1037	break;	1168	break;
1038		1169
1039	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1040	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1041	send_reset (rsi);	1172	send_reset (rsi);
…		…
1047	if (ictx && octx)	1178	if (ictx && octx)
1048	{	1179	{
1049	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1050		1181
1051	if (!p->hmac_chk (ictx))	1182	if (!p->hmac_chk (ictx))
		1183	{
		1184	// rekeying often creates temporary hmac auth floods
		1185	// we assume they don't take longer than a few seconds normally,
		1186	// and suppress messages and resets during that time.
		1187	//TODO: should be done per source address
		1188	if (!hmac_error)
		1189	{
		1190	hmac_error = ev_now () + 3;
		1191	break;
		1192	}
		1193	else if (hmac_error >= ev_now ())
		1194	break; // silently suppress
		1195	else
		1196	{
1052	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1197	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1053	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1054	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1055	else	1203	else
1056	{	1204	{
1057	u32 seqno;	1205	u32 seqno;
1058	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1059		1208
1060	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1061	{	1212	{
1062	vpn->tap->send (d);	1213	vpn->tap->send (d);
1063		1214
1064	if (si != rsi)	1215	if (si != rsi)
1065	{	1216	{
1066	// fast re-sync on connection changes, useful especially for tcp/ip	1217	// fast re-sync on source address changes, useful especially for tcp/ip
		1218	//if (last_si_change < ev_now () + 5.)
1067	si = rsi;	1219	// {
1068
1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1070	conf->nodename, (const char *)si, (const char *)rsi);	1221	conf->nodename, (const char *)si, (const char *)rsi);
		1222
		1223	si = rsi;
		1224
		1225	if (::conf.script_node_change)
		1226	{
		1227	run_script_cb *cb = new run_script_cb;
		1228	cb->set<connection, &connection::script_node_change> (this);
		1229	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1230	}
		1231
		1232	// }
		1233	//else
		1234	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1235	// conf->nodename, (const char *)si, (const char *)rsi);
1071	}	1236	}
		1237	}
		1238	else if (seqclass == 1) // far history
		1239	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1240	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1241	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1242	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1243	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1244	else if (seqclass == 3) // reset
		1245	{
		1246	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1247	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1248	send_reset (rsi);
1072	}	1249	}
1073		1250
1074	delete d;	1251	delete d;
1075	break;	1252	break;
1076	}	1253	}
…		…
1080	break;	1257	break;
1081		1258
1082	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1083	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1084	{	1261	{
1085	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1086		1263
1087	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1264	if (p->id > 0 && p->id <= vpn->conns.size ())
1088	connection *c = vpn->conns[p->id - 1];
1089	conf->protocols = p->protocols;
1090
1091	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1092	conf->id, p->id, c->ictx && c->octx);
1093
1094	if (c->ictx && c->octx)
1095	{	1265	{
		1266	connection *c = vpn->conns[p->id - 1];
		1267	conf->protocols = p->protocols;
		1268
		1269	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1270	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1271	p->protocols,
		1272	c->ictx && c->octx);
		1273
		1274	if (c->ictx && c->octx)
		1275	{
1096	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1097	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1098	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1099	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1279	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1280	}
		1281	else
		1282	c->establish_connection ();
1100	}	1283	}
1101	else	1284	else
1102	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1103	}	1288	}
1104		1289
1105	break;	1290	break;
1106		1291
1107	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1108	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1109	{	1294	{
1110	connect_info_packet *p = (connect_info_packet *)pkt;	1295	connect_info_packet *p = (connect_info_packet *)pkt;
1111		1296
1112	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1297	if (p->id > 0 && p->id <= vpn->conns.size ())
1113	{	1298	{
1114	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1115		1300
1116	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1117	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1302	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1118	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1119		1304
1120	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1305	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1121	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1306	conf->nodename,
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si,
		1309	p->protocols,
		1310	protocol,
		1311	p->si.supported_protocols (c->conf),
		1312	!c->ictx && !c->octx);
1122		1313
1123	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1124		1315
1125	if (dsi.valid ())	1316	if (dsi.valid ())
1126	c->send_auth_request (dsi, true);	1317	c->send_auth_request (dsi, true);
		1318	else
		1319	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si);
1127	}	1322	}
		1323	else
		1324	slog (L_WARN,
		1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1326	p->id);
1128	}	1327	}
1129		1328
1130	break;	1329	break;
1131		1330
1132	default:	1331	default:
1133	send_reset (rsi);	1332	send_reset (rsi);
1134	break;	1333	break;
1135	}	1334	}
1136	}	1335	}
1137		1336
1138	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1139	{	1339	{
1140	if (NOW >= last_activity + ::conf.keepalive + 30)	1340	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1341
		1342	if (when >= 0)
		1343	w.start (when);
		1344	else if (when < -15)
1141	{	1345	{
1142	reset_connection ();	1346	reset_connection ("keepalive overdue");
1143	establish_connection ();	1347	establish_connection ();
1144	}	1348	}
1145	else if (NOW < last_activity + ::conf.keepalive)
1146	w.start (last_activity + ::conf.keepalive);
1147	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1148	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1149	{	1351	{
		1352	w.start (3);
1150	send_ping (si);	1353	send_ping (si);
1151	w.start (NOW + 5);
1152	}	1354	}
1153	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1154	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1155	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1156	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1157	else	1359	else
1158	reset_connection ();	1360	reset_connection ("keepalive timeout");
1159	}	1361	}
1160		1362
		1363	void
1161	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1162	{	1365	{
1163	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1366	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1164		1367
1165	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1368	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1369	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1370	THISNODE->protocols);
1166	p->hmac_set (octx);	1371	p->hmac_set (octx);
1167	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1168		1373
1169	delete p;	1374	delete p;
1170	}	1375	}
1171		1376
1172	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1173	{	1379	{
1174	vpn->script_if_up ();
1175
1176	char *env;	1380	char *env;
		1381	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1382	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1383	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1384	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1385	conf->id & 0xff); putenv (env);
		1386	}
		1387
		1388	void
		1389	connection::script_init_connect_env ()
		1390	{
		1391	vpn->script_init_env ();
		1392
		1393	char *env;
1177	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1394	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1395	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1178	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1179	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1180	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1181	}	1399	}
1182		1400
		1401	inline const char *
1183	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1184	{	1403	{
1185	script_node ();	1404	script_init_connect_env ();
1186		1405
1187	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1188		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1189	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1190	}
1191		1413
		1414	return filename;
		1415	}
		1416
		1417	inline const char *
		1418	connection::script_node_change ()
		1419	{
		1420	script_init_connect_env ();
		1421
		1422	putenv ((char *)"STATE=change");
		1423
		1424	char *filename;
		1425	asprintf (&filename,
		1426	"%s/%s",
		1427	confbase,
		1428	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1429
		1430	return filename;
		1431	}
		1432
		1433	inline const char *
1192	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1193	{	1435	{
1194	script_node ();	1436	script_init_connect_env ();
1195		1437
1196	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1197		1439
1198	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
		1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1445
		1446	return filename;
1199	}	1447	}
1200		1448
1201	connection::connection (struct vpn *vpn, conf_node *conf)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1202	: vpn(vpn), conf(conf)	1450	: vpn(vpn), conf(conf),
1203	, rekey (this, &connection::rekey_cb)
1204	, keepalive (this, &connection::keepalive_cb)
1205	, establish_connection (this, &connection::establish_connection_cb)
1206	#if ENABLE_DNS	1451	#if ENABLE_DNS
1207	, dns (0)	1452	dns (0),
1208	#endif	1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1209	{	1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
		1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1460
		1461	last_establish_attempt = 0.;
1210	octx = ictx = 0;	1462	octx = ictx = 0;
1211	retry_cnt = 0;
1212		1463
1213	if (!conf->protocols) // make sure some protocol is enabled	1464	connectmode = conf->connectmode;
1214	conf->protocols = PROT_UDPv4;
1215		1465
1216	connectmode = conf_node::C_ALWAYS; // initial setting	1466	// queue a dummy packet to force an initial connection attempt
		1467	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1468	vpn_queue.put (new net_packet);
		1469
1217	reset_connection ();	1470	reset_connection ("startup");
1218	}	1471	}
1219		1472
1220	connection::~connection ()	1473	connection::~connection ()
1221	{	1474	{
1222	shutdown ();	1475	shutdown ();
1223	}	1476	}
1224		1477
		1478	void
1225	void connection_init ()	1479	connection_init ()
1226	{	1480	{
1227	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1228	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1229	}	1483	}
1230		1484

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