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Comparing gvpe/src/connection.C (file contents):
Revision 1.30 by pcg, Thu Jan 29 19:22:05 2004 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	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
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	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
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	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
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	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.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
30		43
31	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (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
202	// only do action once every x seconds per host whole allowing bursts.	299	// only do action once every x seconds per host whole allowing bursts.
203	// this implementation ("splay list" ;) is inefficient,	300	// this implementation ("splay list" ;) is inefficient,
204	// but low on resources.	301	// but low on resources.
205	struct net_rate_limiter : list<net_rateinfo>	302	struct net_rate_limiter : list<net_rateinfo>
206	{	303	{
207	static const double ALPHA = 1. - 1. / 600.; // allow bursts	304	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
208	static const double CUTOFF = 10.; // one event every CUTOFF seconds	305	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
209	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	306	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
210	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	307	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
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 - 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 ())
231	{	329	{
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 = 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	}
243	else	341	else
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 * ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * 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 > CUTOFF;	353	bool send = dif > NRL_CUTOFF;
256		354
257	if (dif > MAXDIF)	355	if (dif > NRL_MAXDIF)
258	{	356	{
259	ri.pcnt = 1.;	357	ri.pcnt = 1.;
260	ri.diff = MAXDIF;	358	ri.diff = NRL_MAXDIF;
261	}	359	}
262	else if (send)	360	else if (send)
263	ri.pcnt++;	361	ri.pcnt++;
264		362
265	push_front (ri);	363	push_front (ri);
…		…
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;
335	int outl = 0, outl2;	430	int outl = 0, outl2;
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	u32 cl;
341		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
342	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
343	if (cl)	440	if (cl)
344	{	441	{
345	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
346	d = cdata;	443	d = cdata;
347	l = cl + 2;	444	l = cl + 2;
348		445
349	d[0] = cl >> 8;	446	d[0] = cl >> 8;
350	d[1] = cl;	447	d[1] = cl;
		448	}
351	}	449	}
352	#endif	450	#endif
353		451
354	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
355		453
356	struct {	454	struct {
357	#if RAND_SIZE	455	#if RAND_SIZE
358	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
359	#endif	457	#endif
360	u32 seqno;	458	u32 seqno;
361	} datahdr;	459	} datahdr;
362		460
363	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
364	#if RAND_SIZE	462	#if RAND_SIZE
365	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);
366	#endif	466	#endif
367		467
368	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
392	int outl = 0, outl2;	492	int outl = 0, outl2;
393	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
394	u8 *d;	494	u8 *d;
395	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
396		496
397	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
398		498
399	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
400	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
401		501
402	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
403	d = cdata;	503	d = cdata;
404	else	504	else
405	#endif	505	#endif
406	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
407		507
408	/* 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
409	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
410	d, &outl2,	516	d, &outl2,
411	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
412	outl += outl2;	518	outl += outl2;
413		519
…		…
444	}	550	}
445	};	551	};
446		552
447	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
448	{	554	{
449	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
450	// field comes before this data, so peers with other
451	// hmacs simply will not work.
452	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
453	u8 flags, challengelen, pad2, pad3;	557	u8 flags, features, pad6, pad7, pad8;
454	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
455		559
456	const u8 curflags () const	560	void setup (ptype type, int dst);
		561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		562
		563	static u8 get_features ()
457	{	564	{
		565	u8 f = 0;
		566	#if ENABLE_COMPRESSION
		567	f |= FEATURE_COMPRESSION;
		568	#endif
		569	#if ENABLE_ROHC
		570	f |= FEATURE_ROHC;
		571	#endif
		572	#if ENABLE_BRIDGING
		573	f |= FEATURE_BRIDGING;
		574	#endif
458	return 0x80	575	return f;
459	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
460	}	576	}
461
462	void setup (ptype type, int dst);
463	bool chk_config () const;
464	};	577	};
465		578
		579	void
466	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
467	{	581	{
468	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
469	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
470	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
471	hmaclen = HMACLENGTH;	585	flags = 0;
472	flags = curflags ();	586	features = get_features ();
473	challengelen = sizeof (rsachallenge);
474		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
475	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
476	digest_nid = htonl (EVP_MD_type (RSA_HASH));
477	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 ()));
478		593
479	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
480	set_hdr (type, dst);	595	set_hdr (type, dst);
481	}	596	}
482		597
483	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
484	{	600	{
485	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
486	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);
487	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
488	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)"),
489	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
490	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
491	else if (flags != curflags ())
492	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
493	else if (challengelen != sizeof (rsachallenge))
494	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
495	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
496	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)"),
497	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
498	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
499	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
500	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 ()));
501	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)
502	return true;	624	return true;
		625	}
503		626
504	return false;	627	return false;
505	}	628	}
506		629
507	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
508	{	631	{
509	char magic[8];	632	char magic[8];
510	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
511	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
512	u8 pad2, pad3;	635	u8 pad2, pad3;
513	rsaid id;	636	auth_encr encr;
514	rsaencrdata encr;
515		637
516	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
517	{	639	{
518	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
519	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
520	initiate = !!initiate_;	642	initiate = !!initiate_;
521	protocols = protocols_;	643	protocols = protocols_;
522		644
523	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
524	}	646	}
525	};	647	};
526		648
527	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
528	{	650	{
529	rsaid id;
530	u8 pad1, pad2, pad3;
531	u8 response_len; // encrypted length
532	rsaresponse response;	651	auth_response response;
533		652
534	auth_res_packet (int dst)	653	auth_res_packet (int dst)
535	{	654	{
536	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
537		656
538	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
539	}	658	}
540	};	659	};
541		660
…		…
571	};	690	};
572		691
573	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
574		693
575	void	694	void
576	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
577	{	696	{
578	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."));
579	{	713	}
580	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);
581		717
582	rekey.start (NOW + ::conf.rekey);	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
		723	// make sure rekeying timeouts are slightly asymmetric
		724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
583	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
584		730
585	// send queued packets	731	// send queued packets
586	if (ictx && octx)
587	{
588	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
589	{	733	{
590	send_data_packet (p);	734	if (p->len) send_data_packet (p);
591	delete p;	735	delete p;
592	}	736	}
593		737
594	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
595	{	739	{
596	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
597	delete p;	741	delete p;
598	}
599	}
600	}	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 ());
601	else	752	else
602	{	753	{
603	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
604	establish_connection.start (NOW + 5);	755	protocol = 0;
605	keepalive.stop ();
606	rekey.stop ();
607	}	756	}
608	}
609
610	void
611	connection::reset_si ()
612	{
613	protocol = best_protocol (THISNODE->protocols & conf->protocols);
614
615	// mask out protocols we cannot establish
616	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
617	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
618		757
619	si.set (conf, protocol);	758	si.set (conf, protocol);
620	}	759	}
621		760
622	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
623	const sockinfo &	762	const sockinfo &
624	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
625	{	764	{
626	if (!si.valid ())	765	if (!si.valid ())
627	{	766	{
628	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
629		768
630	if (r)	769	if (r)
631	{	770	{
632	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
633	conf->nodename, r->conf->nodename);	772	conf->nodename, r->conf->nodename);
634	return r->si;	773	return r->si;
635	}	774	}
636	else	775	else
637	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
638	conf->nodename);	777	conf->nodename);
639	}	778	}
640		779
641	return si;	780	return si;
642	}	781	}
643		782
644	void	783	void
645	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)
646	{	785	{
647	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
648	reset_connection ();	787	reset_connection ("packet send error");
649	}	788	}
650		789
651	void	790	void
652	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
653	{	792	{
654	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
655		794
656	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);
657	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
658		799
659	delete pkt;	800	delete pkt;
660	}	801	}
661		802
…		…
676	void	817	void
677	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
678	{	819	{
679	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);
680		821
681	rsachallenge chg;	822	generate_auth_data ();
682	rsa_cache.gen (pkt->id, chg);
683	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
684		824
685	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);
686
687	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
688		827
689	delete pkt;	828	delete pkt;
690	}	829	}
691		830
692	void	831	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
694	{	833	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		835
697	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);
698		838
699	rsa_hash (id, chg, pkt->response);
700
701	pkt->hmac_set (octx);
702
703	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);
704
705	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
706		841
707	delete pkt;	842	delete pkt;
708	}	843	}
709		844
710	void	845	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	847	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
715		851
716	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);
717		853
718	r->hmac_set (octx);	854	r->hmac_set (octx);
719	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
720		856
721	delete r;	857	delete r;
722	}	858	}
723		859
724	void	860	inline void
725	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	862	{
727	if (!ictx	863	if (!(ictx && octx)
728	&& conf != THISNODE	864	&& conf != THISNODE
729	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
730	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
731	&& NOW > w.at)	867	&& !w.is_active ())
732	{	868	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		870	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
736	retry_cnt++;	874	return;
		875	}
737		876
738	w.start (NOW + retry_int);	877	last_establish_attempt = ev_now ();
		878
		879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		880	? (retry_cnt & 3) + 1
		881	: 1 << (retry_cnt >> 2));
739		882
740	reset_si ();	883	reset_si ();
741		884
742	if (si.prot && !si.host)	885	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
		886
		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);
743	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
744	else	893	else
745	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
746	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow || (dsi.prot & PROT_SLOW);
747		902
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	904	{
750	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))
751	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
752	else	910	else
753	send_ping (dsi, 0);	911	send_ping (dsi, 0);
754	}	912	}
755	}	913	}
756	}
757	}
758		914
		915	retry_int *= slow ? 4. : 0.9;
		916
		917	if (retry_int < conf->max_retry)
		918	retry_cnt++;
		919	else
		920	retry_int = conf->max_retry;
		921
		922	w.start (retry_int);
		923	}
		924	}
		925
759	void	926	void
760	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
761	{	928	{
762	if (ictx && octx)	929	if (ictx && octx)
763	{	930	{
764	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
765	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
766		933
767	if (::conf.script_node_down)	934	if (::conf.script_node_down)
768	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	}
769	}	940	}
770		941
771	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
772	delete octx; octx = 0;	943	delete octx; octx = 0;
773		944
774	si.host= 0;	945	si.host = 0;
775		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
776	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
777	retry_cnt = 0;	953	retry_cnt = 0;
778		954
779	rekey.stop ();	955	rekey.stop ();
780	keepalive.stop ();	956	keepalive.stop ();
781	establish_connection.stop ();	957	establish_connection.stop ();
…		…
785	connection::shutdown ()	961	connection::shutdown ()
786	{	962	{
787	if (ictx && octx)	963	if (ictx && octx)
788	send_reset (si);	964	send_reset (si);
789		965
790	reset_connection ();	966	reset_connection ("shutdown");
791	}	967	}
792		968
793	void	969	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
795	{	972	{
796	reset_connection ();	973	reset_connection ("rekeying");
797	establish_connection ();	974	establish_connection ();
798	}	975	}
799		976
800	void	977	void
801	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
815	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
816	rekey ();	993	rekey ();
817	}	994	}
818		995
819	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
820	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
821	{	1008	{
822	if (ictx && octx)	1009	if (ictx && octx)
823	send_data_packet (pkt);	1010	send_data_packet (pkt);
824	else	1011	else
825	{	1012	{
826	if (!broadcast)//DDDD
827	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
828		1014	post_inject_queue ();
829	establish_connection ();
830	}	1015	}
831	}	1016	}
832		1017
		1018	void
833	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
834	{	1020	{
835	if (ictx && octx)	1021	if (ictx && octx)
836	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
837	else	1023	else
838	{	1024	{
839	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
840		1026	post_inject_queue ();
841	establish_connection ();
842	}	1027	}
843	}	1028	}
844		1029
845	void	1030	void
846	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
847	{	1032	{
848	last_activity = NOW;	1033	last_activity = ev_now ();
849		1034
850	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.",
851	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;
852		1040
853	switch (pkt->typ ())	1041	switch (pkt->typ ())
854	{	1042	{
855	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
856	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
857	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
858	// when we receive a ping.	1048	// when we receive a ping.
859	if (!ictx)	1049	if (!ictx)
860	{	1050	{
861	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
862	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
863	}	1053	}
864	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.
865	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
866		1058
867	break;	1059	break;
868		1060
869	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 ();
870	break;	1067	break;
871		1068
872	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)
873	{	1073	{
874	reset_connection ();	1074	reset_connection ("remote reset");
875		1075
876	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
877		1077
878	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
879	{
880	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
881	conf->nodename, (const char *)rsi);
882	connectmode = conf_node::C_DISABLED;
883	}
884	else if (connectmode == conf_node::C_ALWAYS)
885	establish_connection ();	1079	establish_connection ();
886	}	1080	}
		1081
887	break;	1082	break;
888		1083
889	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
890	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
891	{	1086	{
892	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
893		1088
894	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);
895		1092
896	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))
897	{	1099	{
898	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
899	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."),
900	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
901	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
902		1104
903	if (p->initiate)	1105	if (p->initiate)
		1106	{
904	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
905		1108
906	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
907		1112
		1113	auth_data auth;
		1114
908	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
909	{	1116	{
910	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?"),
911	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));
912	break;
913	}	1119	}
914	else	1120	else
915	{	1121	{
916	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
917		1123
918	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
919	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
920		1126
		1127	send_auth_response (rsi);
		1128
		1129	if (chg)
		1130	{
921	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
		1132	features = p->features & config_packet::get_features ();
922		1133
923	send_auth_response (rsi, p->id, k);
924
925	connection_established ();	1134	connection_established (rsi);
926
927	break;	1135	}
928	}	1136	}
		1137
		1138	break;
929	}	1139	}
930	else
931	slog (L_WARN, _("%s(%s): protocol mismatch"),
932	conf->nodename, (const char *)rsi);
933		1140
934	send_reset (rsi);	1141	send_reset (rsi);
935	}	1142	}
936		1143
937	break;	1144	break;
938		1145
939	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
940	{	1147	{
941	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
942		1149
943	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
944		1151
945	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))
946	{	1156	{
947	if (p->prot_minor != PROTOCOL_MINOR)
948	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
949	conf->nodename, (const char *)rsi,
950	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
951
952	rsachallenge chg;
953
954	if (!rsa_cache.find (p->id, chg))
955	{
956	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
957	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
958	break;
959	}	1159	}
960	else	1160	else if (!have_snd_auth)
961	{	1161	{
962	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
963		1163
964	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
965	{
966	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
967	"could be an attack, or just corruption or a synchronization error"),
968	conf->nodename, (const char *)rsi);
969	break;
970	}
971	else
972	{
973	rsaresponse h;
974
975	rsa_hash (p->id, chg, h);
976
977	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
978	{
979	prot_minor = p->prot_minor;
980
981	delete ictx; ictx = cctx;
982
983	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984
985	si = rsi;
986	protocol = rsi.prot;
987
988	connection_established ();	1165	connection_established (rsi);
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}
1006	}	1166	}
1007	}	1167	}
1008
1009	send_reset (rsi);
1010	break;	1168	break;
1011		1169
1012	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1013	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1014	send_reset (rsi);	1172	send_reset (rsi);
…		…
1020	if (ictx && octx)	1178	if (ictx && octx)
1021	{	1179	{
1022	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1023		1181
1024	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	{
1025	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"
1026	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1028	else	1203	else
1029	{	1204	{
1030	u32 seqno;	1205	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1032		1208
1033	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1034	{	1212	{
1035	vpn->tap->send (d);	1213	vpn->tap->send (d);
1036		1214
1037	if (si != rsi)	1215	if (si != rsi)
1038	{	1216	{
1039	// 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.)
1040	si = rsi;	1219	// {
1041
1042	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1043	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);
1044	}	1236	}
1045
1046	delete d;
1047
1048	break;
1049	}	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);
		1249	}
		1250
		1251	delete d;
		1252	break;
1050	}	1253	}
1051	}	1254	}
1052		1255
1053	send_reset (rsi);	1256	send_reset (rsi);
1054	break;	1257	break;
1055		1258
1056	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1057	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1058	{	1261	{
1059	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1060		1263
1061	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 ())
1062	connection *c = vpn->conns[p->id - 1];
1063	conf->protocols = p->protocols;
1064
1065	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1066	conf->id, p->id, c->ictx && c->octx);
1067
1068	if (c->ictx && c->octx)
1069	{	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	{
1070	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1071	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1072	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1073	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 ();
1074	}	1283	}
1075	else	1284	else
1076	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1077	}	1288	}
1078		1289
1079	break;	1290	break;
1080		1291
1081	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1294	{
1084	connect_info_packet *p = (connect_info_packet *) pkt;	1295	connect_info_packet *p = (connect_info_packet *)pkt;
1085		1296
1086	assert (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 ())
1087		1298	{
1088	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1089		1300
1090	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1091	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));
1092	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1093		1304
1094	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]",
1095	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);
1096		1313
1097	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1098		1315
1099	if (dsi.valid ())	1316	if (dsi.valid ())
1100	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);
		1322	}
		1323	else
		1324	slog (L_WARN,
		1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1326	p->id);
1101	}	1327	}
1102		1328
1103	break;	1329	break;
1104		1330
1105	default:	1331	default:
1106	send_reset (rsi);	1332	send_reset (rsi);
1107	break;	1333	break;
1108	}	1334	}
1109	}	1335	}
1110		1336
1111	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1112	{	1339	{
1113	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)
1114	{	1345	{
1115	reset_connection ();	1346	reset_connection ("keepalive overdue");
1116	establish_connection ();	1347	establish_connection ();
1117	}	1348	}
1118	else if (NOW < last_activity + ::conf.keepalive)
1119	w.start (last_activity + ::conf.keepalive);
1120	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1121	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1122	{	1351	{
		1352	w.start (3);
1123	send_ping (si);	1353	send_ping (si);
1124	w.start (NOW + 5);
1125	}	1354	}
1126	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1127	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1128	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1129	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1130	else	1359	else
1131	reset_connection ();	1360	reset_connection ("keepalive timeout");
1132	}	1361	}
1133		1362
		1363	void
1134	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1135	{	1365	{
1136	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);
1137		1367
1138	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);
1139	p->hmac_set (octx);	1371	p->hmac_set (octx);
1140	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1141		1373
1142	delete p;	1374	delete p;
1143	}	1375	}
1144		1376
1145	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1146	{	1379	{
1147	vpn->script_if_up ();
1148
1149	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;
1150	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);
1151	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1152	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1153	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1154	}	1399	}
1155		1400
		1401	inline const char *
1156	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1157	{	1403	{
1158	script_node ();	1404	script_init_connect_env ();
1159		1405
1160	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1161		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1162	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1163	}
1164		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 *
1165	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1166	{	1435	{
1167	script_node ();	1436	script_init_connect_env ();
1168		1437
1169	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1170		1439
1171	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
1172	}	1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1173		1445
		1446	return filename;
		1447	}
		1448
1174	connection::connection(struct vpn *vpn_)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1175	: vpn(vpn_)	1450	: vpn(vpn), conf(conf),
1176	, rekey (this, &connection::rekey_cb)	1451	#if ENABLE_DNS
1177	, keepalive (this, &connection::keepalive_cb)	1452	dns (0),
		1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
1178	, establish_connection (this, &connection::establish_connection_cb)	1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1179	{	1460
		1461	last_establish_attempt = 0.;
1180	octx = ictx = 0;	1462	octx = ictx = 0;
1181	retry_cnt = 0;
1182		1463
1183	connectmode = conf_node::C_ALWAYS; // initial setting	1464	connectmode = conf->connectmode;
		1465
		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
1184	reset_connection ();	1470	reset_connection ("startup");
1185	}	1471	}
1186		1472
1187	connection::~connection ()	1473	connection::~connection ()
1188	{	1474	{
1189	shutdown ();	1475	shutdown ();
1190	}	1476	}
1191		1477
		1478	void
1192	void connection_init ()	1479	connection_init ()
1193	{	1480	{
1194	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1195	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1196	}	1483	}
1197		1484

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