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Comparing gvpe/src/connection.C (file contents):
Revision 1.24 by pcg, Wed Oct 22 01:05:23 2003 UTC vs.
Revision 1.113 by root, Thu Jan 29 00:21:39 2015 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003 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	extern "C" {
23	# include "lzf/lzf.h"
24	}
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>
32		43
33	#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) require (exp)
		49	#endif
34		50
35	#include "conf.h"	51	#include "conf.h"
36	#include "slog.h"	52	#include "slog.h"
37	#include "device.h"	53	#include "device.h"
38	#include "vpn.h"	54	#include "vpn.h"
39	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
40		57
41	#include "netcompat.h"	58	#include "netcompat.h"
42		59
43	#if !HAVE_RAND_PSEUDO_BYTES
44	# define RAND_pseudo_bytes RAND_bytes
45	#endif
46
47	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61
		62	#define ULTRA_FAST 1
		63	#define HLOG 15
		64	#include "lzf/lzf.h"
		65	#include "lzf/lzf_c.c"
		66	#include "lzf/lzf_d.c"
		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	//////////////////////////////////////////////////////////////////////////////
48		111
49	struct crypto_ctx	112	struct crypto_ctx
50	{	113	{
51	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
52	HMAC_CTX hctx;	115	HMAC_CTX hctx;
53		116
54	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);
55	~crypto_ctx ();	118	~crypto_ctx ();
56	};	119	};
57		120
58	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)
59	{	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
60	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
61	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
62	HMAC_CTX_init (&hctx);	153	}
63	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
64	}	154	}
65		155
66	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
67	{	157	{
68	EVP_CIPHER_CTX_cleanup (&cctx);	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
69	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
70	}	160	}
71		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
72	static void	189	static void
73	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
74	{	191	{
75	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
76		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
77	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
78	EVP_DigestInit (&ctx, RSA_HASH);	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
79	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
80	EVP_DigestUpdate(&ctx, &id, sizeof id);
81	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
82	EVP_MD_CTX_cleanup (&ctx);
83	}	196	}
84		197
85	struct rsa_entry {	198	void
86	tstamp expire;	199	connection::generate_auth_data ()
87	rsaid id;
88	rsachallenge chg;
89	};
90
91	struct rsa_cache : list<rsa_entry>
92	{	200	{
93	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
94
95	bool find (const rsaid &id, rsachallenge &chg)
96	{
97	for (iterator i = begin (); i != end (); ++i)
98	{
99	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
100	{
101	memcpy (&chg, &i->chg, sizeof chg);
102
103	erase (i);
104	return true;
105	}
106	}
107
108	if (cleaner.at < NOW)
109	cleaner.start (NOW + RSA_TTL);
110
111	return false;
112	}
113
114	void gen (rsaid &id, rsachallenge &chg)
115	{
116	rsa_entry e;
117
118	RAND_bytes ((unsigned char *)&id, sizeof id);
119	RAND_bytes ((unsigned char *)&chg, sizeof chg);
120
121	e.expire = NOW + RSA_TTL;
122	e.id = id;
123	memcpy (&e.chg, &chg, sizeof chg);
124
125	push_back (e);
126
127	if (cleaner.at < NOW)
128	cleaner.start (NOW + RSA_TTL);
129	}
130
131	rsa_cache ()
132	: cleaner (this, &rsa_cache::cleaner_cb)
133	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
134		206
135	} rsa_cache;	207	// eventual response data
136		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
137	void rsa_cache::cleaner_cb (time_watcher &w)
138	{
139	if (empty ())
140	w.at = TSTAMP_CANCEL;
141	else
142	{	209	}
143	w.at = NOW + RSA_TTL;
144		210
145	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
146	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
147	i = erase (i);
148	else
149	++i;
150	}
151	}	213	}
152		214
153	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
154		216
155	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)
156	{	219	{
157	if (queue[i])	220	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		221
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	222	i = 0;
185	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	226	}
187		227
188	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
189	{	229	{
190	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
191	delete queue[i];	233	delete [] queue;
192	}	234	}
193		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
194	struct net_rateinfo {	292	struct net_rateinfo
		293	{
195	u32 host;	294	u32 host;
196	double pcnt, diff;	295	double pcnt, diff;
197	tstamp last;	296	tstamp last;
198	};	297	};
199		298
200	// 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.
201	// this implementation ("splay list" ;) is inefficient,	300	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	301	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	302	struct net_rate_limiter : list<net_rateinfo>
204	{	303	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	304	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	305	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	306	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	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
209		308
210	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	310	bool can (u32 host);
212	};	311	};
213		312
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		314
		315	bool
216	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
217	{	317	{
218	iterator i;	318	iterator i;
219		319
220	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
221	if (i->host == host)	321	if (i->host == host)
222	break;	322	break;
223	else if (i->last < NOW - EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	324	i = erase (i);
225	else	325	else
226	i++;	326	i++;
227		327
228	if (i == end ())	328	if (i == end ())
229	{	329	{
230	net_rateinfo ri;	330	net_rateinfo ri;
231		331
232	ri.host = host;	332	ri.host = host;
233	ri.pcnt = 1.;	333	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	334	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	335	ri.last = ev_now ();
236		336
237	push_front (ri);	337	push_front (ri);
238		338
239	return true;	339	return true;
240	}	340	}
241	else	341	else
242	{	342	{
243	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
244	erase (i);	344	erase (i);
245		345
246	ri.pcnt = ri.pcnt * ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		348
249	ri.last = NOW;	349	ri.last = ev_now ();
250		350
251	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
252		352
253	bool send = dif > CUTOFF;	353	bool send = dif > NRL_CUTOFF;
254		354
255	if (dif > MAXDIF)	355	if (dif > NRL_MAXDIF)
256	{	356	{
257	ri.pcnt = 1.;	357	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	358	ri.diff = NRL_MAXDIF;
259	}	359	}
260	else if (send)	360	else if (send)
261	ri.pcnt++;	361	ri.pcnt++;
262		362
263	push_front (ri);	363	push_front (ri);
…		…
266	}	366	}
267	}	367	}
268		368
269	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
270		370
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
274	{	373	{
275	unsigned int xlen;
276
277	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
278		375
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
281	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	379	}
284		380
285	void	381	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	383	{
288	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		385	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	387	}
292		388
293	bool	389	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	391	{
296	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		393	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
299	}	395	}
300		396
		397	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	399	{
303	type = type_;	400	type = type_;
304		401
305	int src = THISNODE->id;	402	int src = THISNODE->id;
306		403
…		…
308	srcdst = ((src >> 8) << 4) | (dst >> 8);	405	srcdst = ((src >> 8) << 4) | (dst >> 8);
309	dst1 = dst;	406	dst1 = dst;
310	}	407	}
311		408
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		410
315	struct vpndata_packet:vpn_packet	411	struct vpndata_packet : vpn_packet
		412	{
		413	u32 ctr; // seqno
		414	u8 data[MAXVPNDATA];
		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
316	{	421	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno	422	// the distance from beginning of packet to data member
318		423	return data - at (0);
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	424	}
		425	};
		426
		427	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		428	static unsigned char *
		429	expand_iv (u32 ctr)
		430	{
		431	static u32 iv[IV_SIZE (CIPHER) / 4];
		432
		433	require (sizeof (iv) == 4 * 4);
		434	require (IV_SIZE (CIPHER) % 4 == 0);
		435
		436	iv[0] =
		437	iv[1] =
		438	iv[2] = ctr;
		439
		440	// I would reuse ctr here to to avoid potential endianness issues,
		441	// but it seems openssl wraps around. While this would be still ok,
		442	// and I don't even know if its true, let's play safe and initialise
		443	// to 0.
		444	iv[3] = 0;
		445
		446	return (unsigned char *)iv;
		447	}
328		448
329	void	449	void
330	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	450	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
331	{	451	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	452	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
333	int outl = 0, outl2;	453	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	454	ptype type = PT_DATA_UNCOMPRESSED;
335		455
336	#if ENABLE_COMPRESSION	456	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	457	u8 cdata[MAX_MTU];
338	u32 cl;
339		458
		459	if (conn->features & FEATURE_COMPRESSION)
		460	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	461	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		462
341	if (cl)	463	if (cl)
342	{	464	{
343	type = PT_DATA_COMPRESSED;	465	type = PT_DATA_COMPRESSED;
344	d = cdata;	466	d = cdata;
345	l = cl + 2;	467	l = cl + 2;
346		468
347	d[0] = cl >> 8;	469	d[0] = cl >> 8;
348	d[1] = cl;	470	d[1] = cl;
		471	}
349	}	472	}
350	#endif	473	#endif
351		474
		475	ctr = htonl (seqno);
		476
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	477	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
353		478
354	struct {
355	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];
357	#endif
358	u32 seqno;
359	} datahdr;
360
361	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
364	#endif
365
366	EVP_EncryptUpdate (cctx,	479	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	480	(unsigned char *)data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	481	(unsigned char *)d, l));
369	outl += outl2;	482	outl += outl2;
370		483
371	EVP_EncryptUpdate (cctx,	484	// it seems this is a nop for us, but we do it anyways
372	(unsigned char *) data + outl, &outl2,	485	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
373	(unsigned char *) d, l);
374	outl += outl2;	486	outl += outl2;
375		487
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);
377	outl += outl2;
378
379	len = outl + data_hdr_size ();	488	len = data_hdr_size () + outl;
380		489
381	set_hdr (type, dst);	490	set_hdr (type, dst);
382		491
383	hmac_set (conn->octx);	492	hmac_set (conn->octx);
384	}	493	}
…		…
388	{	497	{
389	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	498	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
390	int outl = 0, outl2;	499	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	500	tap_packet *p = new tap_packet;
392	u8 *d;	501	u8 *d;
393	u32 l = len - data_hdr_size ();
394		502
		503	seqno = ntohl (ctr);
		504
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	505	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
396		506
397	#if ENABLE_COMPRESSION	507	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	508	u8 cdata[MAX_MTU];
399		509
400	if (type == PT_DATA_COMPRESSED)	510	if (type == PT_DATA_COMPRESSED)
401	d = cdata;	511	d = cdata;
402	else	512	else
403	#endif	513	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	514	d = &(*p)[6 + 6];
405		515
406	/* this overwrites part of the src mac, but we fix that later */	516	// this can overwrite the len/dst/src fields
407	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	518	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	520	outl += outl2;
411		521
		522	// it seems this is a nop for us, but we do it anyways
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	523	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	524	outl += outl2;
414		525
415	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
416
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
418	id2mac (src (), p->src);	527	id2mac (src (), p->src);
419		528
420	#if ENABLE_COMPRESSION	529	#if ENABLE_COMPRESSION
421	if (type == PT_DATA_COMPRESSED)	530	if (type == PT_DATA_COMPRESSED)
422	{	531	{
423	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	532	u32 cl = (d[0] << 8) | d[1];
424		533
425	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	534	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
426	&(*p)[6 + 6], MAX_MTU)	535	&(*p)[6 + 6], MAX_MTU)
427	+ 6 + 6;	536	+ 6 + 6;
428	}	537	}
429	else	538	else
430	p->len = outl + (6 + 6 - DATAHDR);	539	p->len = outl + (6 + 6);
431	#endif	540	#endif
432		541
433	return p;	542	return p;
434	}	543	}
435		544
…		…
442	}	551	}
443	};	552	};
444		553
445	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
446	{	555	{
447	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
448	// field comes before this data, so peers with other
449	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
451	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
452	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
453		560
454	const u8 curflags () const	561	void setup (ptype type, int dst);
		562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		563
		564	static u8 get_features ()
455	{	565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f |= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f |= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
456	return 0x80	576	return f;
457	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}	577	}
459
460	void setup (ptype type, int dst);
461	bool chk_config () const;
462	};	578	};
463		579
		580	void
464	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
465	{	582	{
466	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	585	flags = 0;
469	hmaclen = HMACLENGTH;	586	features = get_features ();
470	flags = curflags ();
471	challengelen = sizeof (rsachallenge);
472		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	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 ()));
476		593
477	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
478	set_hdr (type, dst);	595	set_hdr (type, dst);
479	}	596	}
480		597
481	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
482	{	600	{
483	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
484	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)"),
485	else if (randsize != RAND_SIZE)	603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487	else if (hmaclen != HMACLENGTH)
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	605	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	606	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
496	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
497	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	607	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
498	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	608	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		609	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		610	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		611	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
499	else	613	else
		614	{
		615	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		616
		617	if (cmp > 0)
		618	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		619	conf->nodename, (const char *)rsi);
		620	else if (cmp == 0)
500	return true;	621	return true;
		622	}
501		623
502	return false;	624	return false;
503	}	625	}
504		626
505	struct auth_req_packet : config_packet	627	struct auth_req_packet : config_packet // UNPROTECTED
506	{	628	{
507	char magic[8];	629	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	630	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will get patches on forward)	631	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	632	u8 pad2, pad3;
511	rsaid id;	633	auth_encr encr;
512	rsaencrdata encr;
513		634
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	635	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	636	{
516	config_packet::setup (PT_AUTH_REQ, dst);	637	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	638	memcpy (magic, MAGIC, 8);
518	initiate = !!initiate_;	639	initiate = !!initiate_;
519	protocols = protocols_;	640	protocols = protocols_;
520		641
521	len = sizeof (*this) - sizeof (net_packet);	642	len = sizeof (*this) - sizeof (net_packet);
522	}	643	}
523	};	644	};
524		645
525	struct auth_res_packet : config_packet	646	struct auth_res_packet : vpn_packet // UNPROTECTED
526	{	647	{
527	rsaid id;
528	u8 pad1, pad2, pad3;
529	u8 response_len; // encrypted length
530	rsaresponse response;	648	auth_response response;
531		649
532	auth_res_packet (int dst)	650	auth_res_packet (int dst)
533	{	651	{
534	config_packet::setup (PT_AUTH_RES, dst);	652	set_hdr (PT_AUTH_RES, dst);
535		653
536	len = sizeof (*this) - sizeof (net_packet);	654	len = sizeof (*this) - sizeof (net_packet);
537	}	655	}
538	};	656	};
539		657
…		…
569	};	687	};
570		688
571	/////////////////////////////////////////////////////////////////////////////	689	/////////////////////////////////////////////////////////////////////////////
572		690
573	void	691	void
574	connection::connection_established ()	692	connection::connection_established (const sockinfo &rsi)
575	{	693	{
576	if (ictx && octx)	694	if (!have_snd_auth || !have_rcv_auth)
		695	return;
		696
		697	si = rsi;
		698	protocol = rsi.prot;
		699
		700	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		701	conf->nodename, (const char *)rsi,
		702	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		703	PROTOCOL_MAJOR, prot_minor);
		704
		705	if (::conf.script_node_up)
		706	{
		707	run_script_cb *cb = new run_script_cb;
		708	cb->set<connection, &connection::script_node_up> (this);
		709	run_script_queued (cb, _("node-up command execution failed, continuing."));
577	{	710	}
578	connectmode = conf->connectmode;	711
		712	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		713	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
579		714
580	rekey.start (NOW + ::conf.rekey);	715	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		716	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		717
		718	// make sure rekeying timeouts are slightly asymmetric
		719	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		720	rekey.start (rekey_interval, rekey_interval);
		721
		722	hmac_error = 0.;
		723
581	keepalive.start (NOW + ::conf.keepalive);	724	keepalive.start (::conf.keepalive);
582		725
583	// send queued packets	726	// send queued packets
584	if (ictx && octx)
585	{
586	while (tap_packet *p = (tap_packet *)data_queue.get ())	727	while (tap_packet *p = (tap_packet *)data_queue.get ())
587	{	728	{
588	send_data_packet (p);	729	if (p->len) send_data_packet (p);
589	delete p;	730	delete p;
590	}	731	}
591		732
592	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	733	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
593	{	734	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);	735	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;	736	delete p;
596	}
597	}
598	}	737	}
		738
		739	vpn->connection_established (this);
		740	}
		741
		742	void
		743	connection::reset_si ()
		744	{
		745	if (vpn->can_direct (THISNODE, conf))
		746	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
599	else	747	else
600	{	748	{
601	retry_cnt = 0;	749	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
602	establish_connection.start (NOW + 5);	750	protocol = 0;
603	keepalive.reset ();
604	rekey.reset ();
605	}	751	}
606	}
607
608	void
609	connection::reset_si ()
610	{
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);
612
613	// mask out protocols we cannot establish
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
616		752
617	si.set (conf, protocol);	753	si.set (conf, protocol);
618	}	754	}
619		755
620	// ensure sockinfo is valid, forward if necessary	756	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	757	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	758	connection::forward_si (const sockinfo &si) const
623	{	759	{
624	if (!si.valid ())	760	if (!si.valid ())
625	{	761	{
626	connection *r = vpn->find_router ();	762	connection *r = vpn->find_router_for (this);
627		763
628	if (r)	764	if (r)
629	{	765	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	766	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	767	conf->nodename, r->conf->nodename);
632	return r->si;	768	return r->si;
633	}	769	}
634	else	770	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	771	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	772	conf->nodename);
637	}	773	}
638		774
639	return si;	775	return si;
640	}	776	}
641		777
642	void	778	void
643	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	779	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
644	{	780	{
645	if (!vpn->send_vpn_packet (pkt, si, tos))	781	if (!vpn->send_vpn_packet (pkt, si, tos))
646	reset_connection ();	782	reset_connection ("packet send error");
647	}	783	}
648		784
649	void	785	void
650	connection::send_ping (const sockinfo &si, u8 pong)	786	connection::send_ping (const sockinfo &si, u8 pong)
651	{	787	{
652	ping_packet *pkt = new ping_packet;	788	ping_packet *pkt = new ping_packet;
653		789
654	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	790	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		791
		792	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	793	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		794
657	delete pkt;	795	delete pkt;
658	}	796	}
659		797
…		…
674	void	812	void
675	connection::send_auth_request (const sockinfo &si, bool initiate)	813	connection::send_auth_request (const sockinfo &si, bool initiate)
676	{	814	{
677	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	815	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
678		816
679	rsachallenge chg;	817	generate_auth_data ();
680	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	818	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
682		819
683	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	820	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
684
685	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	821	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
686		822
687	delete pkt;	823	delete pkt;
688	}	824	}
689		825
690	void	826	void
691	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	827	connection::send_auth_response (const sockinfo &si)
692	{	828	{
693	auth_res_packet *pkt = new auth_res_packet (conf->id);	829	auth_res_packet *pkt = new auth_res_packet (conf->id);
694		830
695	pkt->id = id;	831	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		832	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
696		833
697	rsa_hash (id, chg, pkt->response);
698
699	pkt->hmac_set (octx);
700
701	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	834	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
702
703	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	835	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704		836
705	delete pkt;	837	delete pkt;
706	}	838	}
707		839
708	void	840	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	841	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	842	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	843	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	844	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		845	conf->protocols);
713		846
714	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	847	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715		848
716	r->hmac_set (octx);	849	r->hmac_set (octx);
717	send_vpn_packet (r, si);	850	send_vpn_packet (r, si);
718		851
719	delete r;	852	delete r;
720	}	853	}
721		854
722	void	855	inline void
723	connection::establish_connection_cb (time_watcher &w)	856	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	857	{
725	if (ictx || conf == THISNODE	858	if (!(ictx && octx)
		859	&& conf != THISNODE
726	|| connectmode == conf_node::C_NEVER	860	&& connectmode != conf_node::C_NEVER
727	|| connectmode == conf_node::C_DISABLED)	861	&& connectmode != conf_node::C_DISABLED
728	w.at = TSTAMP_CANCEL;	862	&& !w.is_active ())
729	else if (w.at <= NOW)
730	{	863	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	864	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732		865	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	866	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		867	{
		868	reset_connection ("no demand");
734	retry_cnt++;	869	return;
		870	}
735		871
736	w.at = NOW + retry_int;	872	last_establish_attempt = ev_now ();
		873
		874	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		875	? (retry_cnt & 3) + 1
		876	: 1 << (retry_cnt >> 2));
737		877
738	reset_si ();	878	reset_si ();
739		879
740	if (si.prot && !si.host)	880	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
		881
		882	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		883	{
		884	/*TODO*/ /* start the timer so we don't recurse endlessly */
		885	w.start (1);
741	vpn->send_connect_request (conf->id);	886	vpn->send_connect_request (this);
		887	}
742	else	888	else
743	{	889	{
		890	if (si.valid ())
		891	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		892	conf->nodename, (const char *)si);
		893
744	const sockinfo &dsi = forward_si (si);	894	const sockinfo &dsi = forward_si (si);
		895
		896	slow = slow || (dsi.prot & PROT_SLOW);
745		897
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	898	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	899	{
748	if (retry_cnt < 4)	900	// use ping after the first few retries
		901	// TODO: on rekeys, the other node might not interpret ping correctly,
		902	// TODO: as it will still have a valid connection
		903	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
749	send_auth_request (dsi, true);	904	send_auth_request (dsi, true);
750	else	905	else
751	send_ping (dsi, 0);	906	send_ping (dsi, 0);
752	}	907	}
753	}	908	}
754	}
755	}
756		909
		910	retry_int *= slow ? 4. : 0.9;
		911
		912	if (retry_int < conf->max_retry)
		913	retry_cnt++;
		914	else
		915	retry_int = conf->max_retry;
		916
		917	w.start (retry_int);
		918	}
		919	}
		920
757	void	921	void
758	connection::reset_connection ()	922	connection::reset_connection (const char *reason)
759	{	923	{
760	if (ictx && octx)	924	if (ictx && octx)
761	{	925	{
762	slog (L_INFO, _("%s(%s): connection lost"),	926	slog (L_INFO, _("%s(%s): connection lost (%s)"),
763	conf->nodename, (const char *)si);	927	conf->nodename, (const char *)si, reason);
764		928
765	if (::conf.script_node_down)	929	if (::conf.script_node_down)
766	run_script (run_script_cb (this, &connection::script_node_down), false);	930	{
		931	run_script_cb *cb = new run_script_cb;
		932	cb->set<connection, &connection::script_node_down> (this);
		933	run_script_queued (cb, _("node-down command execution failed, continuing."));
		934	}
767	}	935	}
768		936
769	delete ictx; ictx = 0;	937	delete ictx; ictx = 0;
770	delete octx; octx = 0;	938	delete octx; octx = 0;
771		939
772	si.host= 0;	940	si.host = 0;
773		941
		942	have_snd_auth = false;
		943	have_rcv_auth = false;
		944	auth_expire = 0.;
		945
774	last_activity = 0;	946	last_activity = 0.;
		947	//last_si_change = 0.;
775	retry_cnt = 0;	948	retry_cnt = 0;
776		949
777	rekey.reset ();	950	rekey.stop ();
778	keepalive.reset ();	951	keepalive.stop ();
779	establish_connection.reset ();	952	establish_connection.stop ();
780	}	953	}
781		954
782	void	955	void
783	connection::shutdown ()	956	connection::shutdown ()
784	{	957	{
785	if (ictx && octx)	958	if (ictx && octx)
786	send_reset (si);	959	send_reset (si);
787		960
788	reset_connection ();	961	reset_connection ("shutdown");
789	}	962	}
790		963
791	void	964	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	965	inline void
		966	connection::rekey_cb (ev::timer &w, int revents)
793	{	967	{
794	w.at = TSTAMP_CANCEL;
795
796	reset_connection ();	968	reset_connection ("rekeying");
797	establish_connection ();	969	establish_connection ();
798	}	970	}
799		971
800	void	972	void
801	connection::send_data_packet (tap_packet *pkt)	973	connection::send_data_packet (tap_packet *pkt)
…		…
815	if (oseqno > MAX_SEQNO)	987	if (oseqno > MAX_SEQNO)
816	rekey ();	988	rekey ();
817	}	989	}
818		990
819	void	991	void
		992	connection::post_inject_queue ()
		993	{
		994	// force a connection every now and when when packets are sent (max 1/s)
		995	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		996	establish_connection.stop ();
		997
		998	establish_connection ();
		999	}
		1000
		1001	void
820	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1002	connection::inject_data_packet (tap_packet *pkt)
821	{	1003	{
822	if (ictx && octx)	1004	if (ictx && octx)
823	send_data_packet (pkt);	1005	send_data_packet (pkt);
824	else	1006	else
825	{	1007	{
826	if (!broadcast)//DDDD
827	data_queue.put (new tap_packet (*pkt));	1008	data_queue.put (new tap_packet (*pkt));
828		1009	post_inject_queue ();
829	establish_connection ();
830	}	1010	}
831	}	1011	}
832		1012
		1013	void
833	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1014	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
834	{	1015	{
835	if (ictx && octx)	1016	if (ictx && octx)
836	send_vpn_packet (pkt, si, tos);	1017	send_vpn_packet (pkt, si, tos);
837	else	1018	else
838	{	1019	{
839	vpn_queue.put (new vpn_packet (*pkt));	1020	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
840		1021	post_inject_queue ();
841	establish_connection ();
842	}	1022	}
843	}	1023	}
844		1024
845	void	1025	void
846	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1026	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
847	{	1027	{
848	last_activity = NOW;	1028	last_activity = ev_now ();
849		1029
850	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1030	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
851	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1031	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1032
		1033	if (connectmode == conf_node::C_DISABLED)
		1034	return;
852		1035
853	switch (pkt->typ ())	1036	switch (pkt->typ ())
854	{	1037	{
855	case vpn_packet::PT_PING:	1038	case vpn_packet::PT_PING:
		1039	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1040
856	// we send pings instead of auth packets after some retries,	1041	// we send pings instead of auth packets after some retries,
857	// so reset the retry counter and establish a connection	1042	// so reset the retry counter and establish a connection
858	// when we receive a ping.	1043	// when we receive a ping.
859	if (!ictx)	1044	if (!ictx)
860	{	1045	{
861	if (auth_rate_limiter.can (rsi))	1046	if (auth_rate_limiter.can (rsi))
862	send_auth_request (rsi, true);	1047	send_auth_request (rsi, true);
863	}	1048	}
864	else	1049	else
		1050	// we would love to change the socket address here, but ping's aren't
		1051	// authenticated, so we best ignore it.
865	send_ping (rsi, 1); // pong	1052	send_ping (rsi, 1); // pong
866		1053
867	break;	1054	break;
868		1055
869	case vpn_packet::PT_PONG:	1056	case vpn_packet::PT_PONG:
		1057	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1058
		1059	// a PONG might mean that the other side doesn't really know
		1060	// about our desire for communication.
		1061	establish_connection ();
870	break;	1062	break;
871		1063
872	case vpn_packet::PT_RESET:	1064	case vpn_packet::PT_RESET:
		1065	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1066
		1067	if (ictx && octx)
873	{	1068	{
874	reset_connection ();	1069	reset_connection ("remote reset");
875		1070
876	config_packet *p = (config_packet *) pkt;	1071	config_packet *p = (config_packet *) pkt;
877		1072
878	if (!p->chk_config ())	1073	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 ();	1074	establish_connection ();
886	}	1075	}
		1076
887	break;	1077	break;
888		1078
889	case vpn_packet::PT_AUTH_REQ:	1079	case vpn_packet::PT_AUTH_REQ:
890	if (auth_rate_limiter.can (rsi))	1080	if (auth_rate_limiter.can (rsi))
891	{	1081	{
892	auth_req_packet *p = (auth_req_packet *) pkt;	1082	auth_req_packet *p = (auth_req_packet *)pkt;
893		1083
894	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1084	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1085	conf->nodename, p->initiate ? "initiate" : "reply",
		1086	p->protocols, p->features);
895		1087
896	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1088	if (memcmp (p->magic, MAGIC, 8))
		1089	{
		1090	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1091	conf->nodename, (const char *)rsi);
		1092	}
		1093	else if (p->chk_config (conf, rsi))
897	{	1094	{
898	if (p->prot_minor != PROTOCOL_MINOR)	1095	if (p->prot_minor != PROTOCOL_MINOR)
899	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1096	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
900	conf->nodename, (const char *)rsi,	1097	conf->nodename, (const char *)rsi,
901	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1098	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
902		1099
903	if (p->initiate)	1100	if (p->initiate)
		1101	{
904	send_auth_request (rsi, false);	1102	send_auth_request (rsi, false);
905		1103
906	rsachallenge k;	1104	if (ictx && octx)
		1105	reset_connection ("reconnect");
		1106	}
907		1107
		1108	auth_data auth;
		1109
908	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1110	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
909	{	1111	{
910	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1112	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));	1113	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
912	break;
913	}	1114	}
914	else	1115	else
915	{	1116	{
916	delete octx;	1117	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
917		1118
918	octx = new crypto_ctx (k, 1);	1119	rcv_auth = auth;
919	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1120	have_rcv_auth = true;
920		1121
		1122	send_auth_response (rsi);
		1123
		1124	if (chg)
		1125	{
921	conf->protocols = p->protocols;	1126	conf->protocols = p->protocols;
		1127	features = p->features & config_packet::get_features ();
922		1128
923	send_auth_response (rsi, p->id, k);
924
925	connection_established ();	1129	connection_established (rsi);
926
927	break;	1130	}
928	}	1131	}
		1132
		1133	break;
929	}	1134	}
930	else
931	slog (L_WARN, _("%s(%s): protocol mismatch"),
932	conf->nodename, (const char *)rsi);
933		1135
934	send_reset (rsi);	1136	send_reset (rsi);
935	}	1137	}
936		1138
937	break;	1139	break;
938		1140
939	case vpn_packet::PT_AUTH_RES:	1141	case vpn_packet::PT_AUTH_RES:
940	{	1142	{
941	auth_res_packet *p = (auth_res_packet *) pkt;	1143	auth_res_packet *p = (auth_res_packet *)pkt;
942		1144
943	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1145	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
944		1146
945	if (p->chk_config ())	1147	auth_mac local_mac;
		1148	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1149
		1150	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
946	{	1151	{
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"),	1152	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
957	conf->nodename, (const char *)rsi);	1153	conf->nodename, (const char *)rsi);
958	break;
959	}	1154	}
960	else	1155	else if (!have_snd_auth)
961	{	1156	{
962	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1157	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
963		1158
964	if (!p->hmac_chk (cctx))	1159	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 an 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 ();	1160	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	}	1161	}
1007	}	1162	}
1008
1009	send_reset (rsi);
1010	break;	1163	break;
1011		1164
1012	case vpn_packet::PT_DATA_COMPRESSED:	1165	case vpn_packet::PT_DATA_COMPRESSED:
1013	#if !ENABLE_COMPRESSION	1166	#if !ENABLE_COMPRESSION
1014	send_reset (rsi);	1167	send_reset (rsi);
…		…
1020	if (ictx && octx)	1173	if (ictx && octx)
1021	{	1174	{
1022	vpndata_packet *p = (vpndata_packet *)pkt;	1175	vpndata_packet *p = (vpndata_packet *)pkt;
1023		1176
1024	if (!p->hmac_chk (ictx))	1177	if (!p->hmac_chk (ictx))
		1178	{
		1179	// rekeying often creates temporary hmac auth floods
		1180	// we assume they don't take longer than a few seconds normally,
		1181	// and suppress messages and resets during that time.
		1182	//TODO: should be done per source address
		1183	if (!hmac_error)
		1184	{
		1185	hmac_error = ev_now () + 3;
		1186	break;
		1187	}
		1188	else if (hmac_error >= ev_now ())
		1189	break; // silently suppress
		1190	else
		1191	{
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1192	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1193	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1194	conf->nodename, (const char *)rsi);
		1195	// reset
		1196	}
		1197	}
1028	else	1198	else
1029	{	1199	{
1030	u32 seqno;	1200	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1201	tap_packet *d = p->unpack (this, seqno);
		1202	int seqclass = iseqno.seqno_classify (seqno);
1032		1203
1033	if (iseqno.recv_ok (seqno))	1204	hmac_error = 0;
		1205
		1206	if (seqclass == 0) // ok
1034	{	1207	{
1035	vpn->tap->send (d);	1208	vpn->tap->send (d);
1036		1209
1037	if (si != rsi)	1210	if (si != rsi)
1038	{	1211	{
1039	// fast re-sync on connection changes, useful especially for tcp/ip	1212	// fast re-sync on source address changes, useful especially for tcp/ip
		1213	//if (last_si_change < ev_now () + 5.)
1040	si = rsi;	1214	// {
1041
1042	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1215	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1043	conf->nodename, (const char *)si, (const char *)rsi);	1216	conf->nodename, (const char *)si, (const char *)rsi);
		1217
		1218	si = rsi;
		1219
		1220	if (::conf.script_node_change)
		1221	{
		1222	run_script_cb *cb = new run_script_cb;
		1223	cb->set<connection, &connection::script_node_change> (this);
		1224	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1225	}
		1226
		1227	// }
		1228	//else
		1229	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1230	// conf->nodename, (const char *)si, (const char *)rsi);
1044	}	1231	}
1045
1046	delete d;
1047
1048	break;
1049	}	1232	}
		1233	else if (seqclass == 1) // far history
		1234	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1235	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1236	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1237	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1238	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1239	else if (seqclass == 3) // reset
		1240	{
		1241	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1242	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1243	send_reset (rsi);
		1244	}
		1245
		1246	delete d;
		1247	break;
1050	}	1248	}
1051	}	1249	}
1052		1250
1053	send_reset (rsi);	1251	send_reset (rsi);
1054	break;	1252	break;
1055		1253
1056	case vpn_packet::PT_CONNECT_REQ:	1254	case vpn_packet::PT_CONNECT_REQ:
1057	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1255	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1058	{	1256	{
1059	connect_req_packet *p = (connect_req_packet *) pkt;	1257	connect_req_packet *p = (connect_req_packet *)pkt;
1060		1258
1061	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1259	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	{	1260	{
		1261	connection *c = vpn->conns[p->id - 1];
		1262	conf->protocols = p->protocols;
		1263
		1264	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1265	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1266	p->protocols,
		1267	c->ictx && c->octx);
		1268
		1269	if (c->ictx && c->octx)
		1270	{
1070	// send connect_info packets to both sides, in case one is	1271	// send connect_info packets to both sides, in case one is
1071	// behind a nat firewall (or both ;)	1272	// behind a nat firewall (or both ;)
1072	c->send_connect_info (conf->id, si, conf->protocols);	1273	c->send_connect_info (conf->id, si, conf->protocols);
1073	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1274	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1275	}
		1276	else
		1277	c->establish_connection ();
1074	}	1278	}
1075	else	1279	else
1076	c->establish_connection ();	1280	slog (L_WARN,
		1281	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1282	p->id);
1077	}	1283	}
1078		1284
1079	break;	1285	break;
1080		1286
1081	case vpn_packet::PT_CONNECT_INFO:	1287	case vpn_packet::PT_CONNECT_INFO:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1288	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1289	{
1084	connect_info_packet *p = (connect_info_packet *) pkt;	1290	connect_info_packet *p = (connect_info_packet *)pkt;
1085		1291
1086	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1292	if (p->id > 0 && p->id <= vpn->conns.size ())
1087		1293	{
1088	connection *c = vpn->conns[p->id - 1];	1294	connection *c = vpn->conns[p->id - 1];
1089		1295
1090	c->conf->protocols = p->protocols;	1296	c->conf->protocols = p->protocols;
1091	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1297	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1092	p->si.upgrade_protocol (protocol, c->conf);	1298	p->si.upgrade_protocol (protocol, c->conf);
1093		1299
1094	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1300	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);	1301	conf->nodename,
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si,
		1304	p->protocols,
		1305	protocol,
		1306	p->si.supported_protocols (c->conf),
		1307	!c->ictx && !c->octx);
1096		1308
1097	const sockinfo &dsi = forward_si (p->si);	1309	const sockinfo &dsi = forward_si (p->si);
1098		1310
1099	if (dsi.valid ())	1311	if (dsi.valid ())
1100	c->send_auth_request (dsi, true);	1312	c->send_auth_request (dsi, true);
		1313	else
		1314	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1315	vpn->conns[p->id - 1]->conf->nodename,
		1316	(const char *)p->si);
		1317	}
		1318	else
		1319	slog (L_WARN,
		1320	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1321	p->id);
1101	}	1322	}
1102		1323
1103	break;	1324	break;
1104		1325
1105	default:	1326	default:
1106	send_reset (rsi);	1327	send_reset (rsi);
1107	break;	1328	break;
1108	}	1329	}
1109	}	1330	}
1110		1331
1111	void connection::keepalive_cb (time_watcher &w)	1332	inline void
		1333	connection::keepalive_cb (ev::timer &w, int revents)
1112	{	1334	{
1113	if (NOW >= last_activity + ::conf.keepalive + 30)	1335	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1336
		1337	if (when >= 0)
		1338	w.start (when);
		1339	else if (when < -15)
1114	{	1340	{
1115	reset_connection ();	1341	reset_connection ("keepalive overdue");
1116	establish_connection ();	1342	establish_connection ();
1117	}	1343	}
1118	else if (NOW < last_activity + ::conf.keepalive)
1119	w.at = last_activity + ::conf.keepalive;
1120	else if (conf->connectmode != conf_node::C_ONDEMAND	1344	else if (conf->connectmode != conf_node::C_ONDEMAND
1121	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1345	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1122	{	1346	{
		1347	w.start (3);
1123	send_ping (si);	1348	send_ping (si);
1124	w.at = NOW + 5;
1125	}	1349	}
1126	else if (NOW < last_activity + ::conf.keepalive + 10)	1350	else if (when >= -10)
1127	// hold ondemand connections implicitly a few seconds longer	1351	// hold ondemand connections implicitly a few seconds longer
1128	// should delete octx, though, or something like that ;)	1352	// should delete octx, though, or something like that ;)
1129	w.at = last_activity + ::conf.keepalive + 10;	1353	w.start (when + 10);
1130	else	1354	else
1131	reset_connection ();	1355	reset_connection ("keepalive timeout");
1132	}	1356	}
1133		1357
		1358	void
1134	void connection::send_connect_request (int id)	1359	connection::send_connect_request (int id)
1135	{	1360	{
1136	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1361	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1137		1362
1138	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1363	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1364	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1365	THISNODE->protocols);
1139	p->hmac_set (octx);	1366	p->hmac_set (octx);
1140	send_vpn_packet (p, si);	1367	send_vpn_packet (p, si);
1141		1368
1142	delete p;	1369	delete p;
1143	}	1370	}
1144		1371
1145	void connection::script_node ()	1372	void
		1373	connection::script_init_env (const char *ext)
1146	{	1374	{
1147	vpn->script_if_up ();
1148
1149	char *env;	1375	char *env;
		1376	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1377	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1378	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1379	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1380	conf->id & 0xff); putenv (env);
		1381	}
		1382
		1383	void
		1384	connection::script_init_connect_env ()
		1385	{
		1386	vpn->script_init_env ();
		1387
		1388	char *env;
1150	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1389	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1390	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1151	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1391	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1152	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1392	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1153	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1393	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1154	}	1394	}
1155		1395
		1396	inline const char *
1156	const char *connection::script_node_up ()	1397	connection::script_node_up ()
1157	{	1398	{
1158	script_node ();	1399	script_init_connect_env ();
1159		1400
1160	putenv ("STATE=up");	1401	putenv ((char *)"STATE=up");
1161		1402
		1403	char *filename;
		1404	asprintf (&filename,
		1405	"%s/%s",
		1406	confbase,
1162	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1407	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1163	}
1164		1408
		1409	return filename;
		1410	}
		1411
		1412	inline const char *
		1413	connection::script_node_change ()
		1414	{
		1415	script_init_connect_env ();
		1416
		1417	putenv ((char *)"STATE=change");
		1418
		1419	char *filename;
		1420	asprintf (&filename,
		1421	"%s/%s",
		1422	confbase,
		1423	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1424
		1425	return filename;
		1426	}
		1427
		1428	inline const char *
1165	const char *connection::script_node_down ()	1429	connection::script_node_down ()
1166	{	1430	{
1167	script_node ();	1431	script_init_connect_env ();
1168		1432
1169	putenv ("STATE=down");	1433	putenv ((char *)"STATE=down");
1170		1434
1171	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1435	char *filename;
1172	}	1436	asprintf (&filename,
		1437	"%s/%s",
		1438	confbase,
		1439	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1173		1440
		1441	return filename;
		1442	}
		1443
1174	connection::connection(struct vpn *vpn_)	1444	connection::connection (struct vpn *vpn, conf_node *conf)
1175	: vpn(vpn_)	1445	: vpn(vpn), conf(conf),
1176	, rekey (this, &connection::rekey_cb)	1446	#if ENABLE_DNS
1177	, keepalive (this, &connection::keepalive_cb)	1447	dns (0),
		1448	#endif
		1449	data_queue(conf->max_ttl, conf->max_queue + 1),
		1450	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1451	{
		1452	rekey .set<connection, &connection::rekey_cb > (this);
		1453	keepalive .set<connection, &connection::keepalive_cb > (this);
1178	, establish_connection (this, &connection::establish_connection_cb)	1454	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1179	{	1455
		1456	last_establish_attempt = 0.;
1180	octx = ictx = 0;	1457	octx = ictx = 0;
1181	retry_cnt = 0;
1182		1458
1183	connectmode = conf_node::C_ALWAYS; // initial setting	1459	connectmode = conf->connectmode;
		1460
		1461	// queue a dummy packet to force an initial connection attempt
		1462	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1463	vpn_queue.put (new net_packet);
		1464
1184	reset_connection ();	1465	reset_connection ("startup");
1185	}	1466	}
1186		1467
1187	connection::~connection ()	1468	connection::~connection ()
1188	{	1469	{
1189	shutdown ();	1470	shutdown ();
1190	}	1471	}
1191		1472
		1473	void
1192	void connection_init ()	1474	connection_init ()
1193	{	1475	{
1194	auth_rate_limiter.clear ();	1476	auth_rate_limiter.clear ();
1195	reset_rate_limiter.clear ();	1477	reset_rate_limiter.clear ();
1196	}	1478	}
1197		1479

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