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Comparing gvpe/src/connection.C (file contents):
Revision 1.12 by pcg, Sun Apr 13 16:53:36 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) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	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.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
		38	#include <openssl/opensslv.h>
27	#include <openssl/rand.h>	39	#include <openssl/rand.h>
28	#include <openssl/evp.h>	40	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
30	#include <openssl/err.h>	42	#include <openssl/err.h>
31		43
32	#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
33		50
34	#include "conf.h"	51	#include "conf.h"
35	#include "slog.h"	52	#include "slog.h"
36	#include "device.h"	53	#include "device.h"
37	#include "vpn.h"	54	#include "vpn.h"
38	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
39		57
40	#if !HAVE_RAND_PSEUDO_BYTES	58	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		59
44	#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	//////////////////////////////////////////////////////////////////////////////
45		111
46	struct crypto_ctx	112	struct crypto_ctx
47	{	113	{
48	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	115	HMAC_CTX hctx;
50		116
51	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);
52	~crypto_ctx ();	118	~crypto_ctx ();
53	};	119	};
54		120
55	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)
56	{	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
57	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	153	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	154	}
62		155
63	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
64	{	157	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
67	}	160	}
68		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
69	static void	189	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	191	{
72	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	196	}
81		197
82	struct rsa_entry {	198	void
83	tstamp expire;	199	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	200	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		206
132	} rsa_cache;	207	// eventual response data
133		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	209	}
140	w.at = NOW + RSA_TTL;
141		210
142	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
143	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	213	}
149		214
150	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
151		216
152	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)
153	{	219	{
154	if (queue[i])	220	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		221
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	net_packet *pkt_queue::get ()
166	{
167	net_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	222	i = 0;
182	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	226	}
184		227
185	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
186	{	229	{
187	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
188	delete queue[i];	233	delete [] queue;
189	}	234	}
190		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
191	struct net_rateinfo {	292	struct net_rateinfo
		293	{
192	u32 host;	294	u32 host;
193	double pcnt, diff;	295	double pcnt, diff;
194	tstamp last;	296	tstamp last;
195	};	297	};
196		298
197	// 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.
198	// this implementation ("splay list" ;) is inefficient,	300	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	301	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	302	struct net_rate_limiter : list<net_rateinfo>
201	{	303	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	304	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	305	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	306	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	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
206		308
207	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	310	bool can (u32 host);
209	};	311	};
210		312
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		314
		315	bool
213	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
214	{	317	{
215	iterator i;	318	iterator i;
216		319
217	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
218	if (i->host == host)	321	if (i->host == host)
219	break;	322	break;
220	else if (i->last < NOW - EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	324	i = erase (i);
222	else	325	else
223	i++;	326	i++;
224		327
225	if (i == end ())	328	if (i == end ())
226	{	329	{
227	net_rateinfo ri;	330	net_rateinfo ri;
228		331
229	ri.host = host;	332	ri.host = host;
230	ri.pcnt = 1.;	333	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	334	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	335	ri.last = ev_now ();
233		336
234	push_front (ri);	337	push_front (ri);
235		338
236	return true;	339	return true;
237	}	340	}
238	else	341	else
239	{	342	{
240	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
241	erase (i);	344	erase (i);
242		345
243	ri.pcnt = ri.pcnt * ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		348
246	ri.last = NOW;	349	ri.last = ev_now ();
247		350
248	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
249		352
250	bool send = dif > CUTOFF;	353	bool send = dif > NRL_CUTOFF;
251		354
252	if (dif > MAXDIF)	355	if (dif > NRL_MAXDIF)
253	{	356	{
254	ri.pcnt = 1.;	357	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	358	ri.diff = NRL_MAXDIF;
256	}	359	}
257	else if (send)	360	else if (send)
258	ri.pcnt++;	361	ri.pcnt++;
259		362
260	push_front (ri);	363	push_front (ri);
…		…
263	}	366	}
264	}	367	}
265		368
266	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
267		370
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
269
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
271	{	373	{
272	unsigned int xlen;
273
274	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
275		375
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
278	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
280	}	379	}
281		380
282	void	381	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	383	{
285	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		385	hmac_gen (ctx, hmac_digest);
287	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
288	}	387	}
289		388
290	bool	389	bool
291	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
292	{	391	{
293	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
294		393	hmac_gen (ctx, hmac_digest);
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
296	}	395	}
297		396
		397	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	399	{
300	type = type_;	400	type = type_;
301		401
302	int src = THISNODE->id;	402	int src = THISNODE->id;
303		403
…		…
305	srcdst = ((src >> 8) << 4) | (dst >> 8);	405	srcdst = ((src >> 8) << 4) | (dst >> 8);
306	dst1 = dst;	406	dst1 = dst;
307	}	407	}
308		408
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		410
312	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
313	{	421	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno	422	// the distance from beginning of packet to data member
315		423	return data - at (0);
316	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
317	tap_packet *unpack (connection *conn, u32 &seqno);
318	private:
319
320	const u32 data_hdr_size () const
321	{
322	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	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	}
325		448
326	void	449	void
327	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)
328	{	451	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	452	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	453	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	454	ptype type = PT_DATA_UNCOMPRESSED;
332		455
333	#if ENABLE_COMPRESSION	456	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	457	u8 cdata[MAX_MTU];
335	u32 cl;
336		458
		459	if (conn->features & FEATURE_COMPRESSION)
		460	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	461	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		462
338	if (cl)	463	if (cl)
339	{	464	{
340	type = PT_DATA_COMPRESSED;	465	type = PT_DATA_COMPRESSED;
341	d = cdata;	466	d = cdata;
342	l = cl + 2;	467	l = cl + 2;
343		468
344	d[0] = cl >> 8;	469	d[0] = cl >> 8;
345	d[1] = cl;	470	d[1] = cl;
		471	}
346	}	472	}
347	#endif	473	#endif
348		474
		475	ctr = htonl (seqno);
		476
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	477	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
350		478
351	struct {
352	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];
354	#endif
355	u32 seqno;
356	} datahdr;
357
358	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
361	#endif
362
363	EVP_EncryptUpdate (cctx,	479	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	480	(unsigned char *)data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	481	(unsigned char *)d, l));
366	outl += outl2;	482	outl += outl2;
367		483
368	EVP_EncryptUpdate (cctx,	484	// it seems this is a nop for us, but we do it anyways
369	(unsigned char *) data + outl, &outl2,	485	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
370	(unsigned char *) d, l);
371	outl += outl2;	486	outl += outl2;
372		487
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);
374	outl += outl2;
375
376	len = outl + data_hdr_size ();	488	len = data_hdr_size () + outl;
377		489
378	set_hdr (type, dst);	490	set_hdr (type, dst);
379		491
380	hmac_set (conn->octx);	492	hmac_set (conn->octx);
381	}	493	}
…		…
385	{	497	{
386	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	498	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
387	int outl = 0, outl2;	499	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	500	tap_packet *p = new tap_packet;
389	u8 *d;	501	u8 *d;
390	u32 l = len - data_hdr_size ();
391		502
		503	seqno = ntohl (ctr);
		504
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	505	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
393		506
394	#if ENABLE_COMPRESSION	507	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	508	u8 cdata[MAX_MTU];
396		509
397	if (type == PT_DATA_COMPRESSED)	510	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	511	d = cdata;
399	else	512	else
400	#endif	513	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	514	d = &(*p)[6 + 6];
402		515
403	/* this overwrites part of the src mac, but we fix that later */	516	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	518	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	520	outl += outl2;
408		521
		522	// it seems this is a nop for us, but we do it anyways
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	523	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	524	outl += outl2;
411		525
412	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
413
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
415	id2mac (src (), p->src);	527	id2mac (src (), p->src);
416		528
417	#if ENABLE_COMPRESSION	529	#if ENABLE_COMPRESSION
418	if (type == PT_DATA_COMPRESSED)	530	if (type == PT_DATA_COMPRESSED)
419	{	531	{
420	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	532	u32 cl = (d[0] << 8) | d[1];
421		533
422	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,
423	&(*p)[6 + 6], MAX_MTU)	535	&(*p)[6 + 6], MAX_MTU)
424	+ 6 + 6;	536	+ 6 + 6;
425	}	537	}
426	else	538	else
427	p->len = outl + (6 + 6 - DATAHDR);	539	p->len = outl + (6 + 6);
428	#endif	540	#endif
429		541
430	return p;	542	return p;
431	}	543	}
432		544
…		…
439	}	551	}
440	};	552	};
441		553
442	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
443	{	555	{
444	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
450		560
451	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 ()
452	{	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
453	return 0x80	576	return f;
454	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	577	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	578	};
460		579
		580	void
461	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
462	{	582	{
463	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	585	flags = 0;
466	hmaclen = HMACLENGTH;	586	features = get_features ();
467	flags = curflags ();
468	challengelen = sizeof (rsachallenge);
469		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	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 ()));
473		593
474	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	595	set_hdr (type, dst);
476	}	596	}
477		597
478	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	600	{
480	return prot_major == PROTOCOL_MAJOR	601	if (prot_major != PROTOCOL_MAJOR)
481	&& randsize == RAND_SIZE	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
482	&& hmaclen == HMACLENGTH	603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
483	&& flags == curflags ()
484	&& challengelen == sizeof (rsachallenge)
485	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
486	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	605	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
487	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	606	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
488	}	607	else if (mac_nid != htonl (EVP_MD_type (MAC_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 ()));
		613	else
		614	{
		615	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
489		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)
		621	return true;
		622	}
		623
		624	return false;
		625	}
		626
490	struct auth_req_packet : config_packet	627	struct auth_req_packet : config_packet // UNPROTECTED
491	{	628	{
492	char magic[8];	629	char magic[8];
493	u8 initiate; // false if this is just an automatic reply	630	u8 initiate; // false if this is just an automatic reply
494	u8 protocols; // supported protocols (will get patches on forward)	631	u8 protocols; // supported protocols (will be patched on forward)
495	u8 pad2, pad3;	632	u8 pad2, pad3;
496	rsaid id;	633	auth_encr encr;
497	rsaencrdata encr;
498		634
499	auth_req_packet (int dst, bool initiate_, u8 protocols_)	635	auth_req_packet (int dst, bool initiate_, u8 protocols_)
500	{	636	{
501	config_packet::setup (PT_AUTH_REQ, dst);	637	config_packet::setup (PT_AUTH_REQ, dst);
502	strncpy (magic, MAGIC, 8);	638	memcpy (magic, MAGIC, 8);
503	initiate = !!initiate_;	639	initiate = !!initiate_;
504	protocols = protocols_;	640	protocols = protocols_;
505		641
506	len = sizeof (*this) - sizeof (net_packet);	642	len = sizeof (*this) - sizeof (net_packet);
507	}	643	}
508	};	644	};
509		645
510	struct auth_res_packet : config_packet	646	struct auth_res_packet : vpn_packet // UNPROTECTED
511	{	647	{
512	rsaid id;
513	u8 pad1, pad2, pad3;
514	u8 response_len; // encrypted length
515	rsaresponse response;	648	auth_response response;
516		649
517	auth_res_packet (int dst)	650	auth_res_packet (int dst)
518	{	651	{
519	config_packet::setup (PT_AUTH_RES, dst);	652	set_hdr (PT_AUTH_RES, dst);
520		653
521	len = sizeof (*this) - sizeof (net_packet);	654	len = sizeof (*this) - sizeof (net_packet);
522	}	655	}
523	};	656	};
524		657
…		…
554	};	687	};
555		688
556	/////////////////////////////////////////////////////////////////////////////	689	/////////////////////////////////////////////////////////////////////////////
557		690
558	void	691	void
559	connection::connection_established ()	692	connection::connection_established (const sockinfo &rsi)
560	{	693	{
561	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."));
562	{	710	}
563	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);
564		714
565	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
566	keepalive.start (NOW + ::conf.keepalive);	724	keepalive.start (::conf.keepalive);
567		725
568	// send queued packets	726	// send queued packets
569	if (ictx && octx)
570	{
571	while (tap_packet *p = (tap_packet *)data_queue.get ())	727	while (tap_packet *p = (tap_packet *)data_queue.get ())
572	{	728	{
573	send_data_packet (p);	729	if (p->len) send_data_packet (p);
574	delete p;	730	delete p;
575	}	731	}
576		732
577	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	733	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
578	{	734	{
579	send_vpn_packet (p, si, IPTOS_RELIABILITY);	735	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
580	delete p;	736	delete p;
581	}
582	}
583	}	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 ());
584	else	747	else
585	{	748	{
586	retry_cnt = 0;	749	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
587	establish_connection.start (NOW + 5);	750	protocol = 0;
588	keepalive.reset ();
589	rekey.reset ();
590	}	751	}
591	}
592
593	void
594	connection::reset_si ()
595	{
596	protocol = best_protocol (THISNODE->protocols & conf->protocols);
597
598	// mask out protocols we cannot establish
599	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
600	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
601		752
602	si.set (conf, protocol);	753	si.set (conf, protocol);
603	}	754	}
604		755
605	// ensure sockinfo is valid, forward if necessary	756	// ensure sockinfo is valid, forward if necessary
606	const sockinfo &	757	const sockinfo &
607	connection::forward_si (const sockinfo &si) const	758	connection::forward_si (const sockinfo &si) const
608	{	759	{
609	if (!si.valid ())	760	if (!si.valid ())
610	{	761	{
611	connection *r = vpn->find_router ();	762	connection *r = vpn->find_router_for (this);
612		763
613	if (r)	764	if (r)
614	{	765	{
615	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	766	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
616	conf->nodename, r->conf->nodename);	767	conf->nodename, r->conf->nodename);
617	return r->si;	768	return r->si;
618	}	769	}
619	else	770	else
620	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	771	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
621	conf->nodename);	772	conf->nodename);
622	}	773	}
623		774
624	return si;	775	return si;
625	}	776	}
626		777
627	void	778	void
628	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)
629	{	780	{
630	if (!vpn->send_vpn_packet (pkt, si, tos))	781	if (!vpn->send_vpn_packet (pkt, si, tos))
631	reset_connection ();	782	reset_connection ("packet send error");
632	}	783	}
633		784
634	void	785	void
635	connection::send_ping (const sockinfo &si, u8 pong)	786	connection::send_ping (const sockinfo &si, u8 pong)
636	{	787	{
637	ping_packet *pkt = new ping_packet;	788	ping_packet *pkt = new ping_packet;
638		789
639	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);
640	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	793	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
641		794
642	delete pkt;	795	delete pkt;
643	}	796	}
644		797
…		…
659	void	812	void
660	connection::send_auth_request (const sockinfo &si, bool initiate)	813	connection::send_auth_request (const sockinfo &si, bool initiate)
661	{	814	{
662	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);
663		816
664	rsachallenge chg;	817	generate_auth_data ();
		818	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
665		819
666	rsa_cache.gen (pkt->id, chg);
667
668	if (0 > RSA_public_encrypt (sizeof chg,
669	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
670	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
671	fatal ("RSA_public_encrypt error");
672
673	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);
674
675	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
676		822
677	delete pkt;	823	delete pkt;
678	}	824	}
679		825
680	void	826	void
681	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	827	connection::send_auth_response (const sockinfo &si)
682	{	828	{
683	auth_res_packet *pkt = new auth_res_packet (conf->id);	829	auth_res_packet *pkt = new auth_res_packet (conf->id);
684		830
685	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);
686		833
687	rsa_hash (id, chg, pkt->response);
688
689	pkt->hmac_set (octx);
690
691	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);
692
693	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
694		836
695	delete pkt;	837	delete pkt;
696	}	838	}
697		839
698	void	840	void
699	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	841	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
700	{	842	{
701	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	843	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
702	conf->id, rid, (const char *)rsi);	844	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		845	conf->protocols);
703		846
704	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);
705		848
706	r->hmac_set (octx);	849	r->hmac_set (octx);
707	send_vpn_packet (r, si);	850	send_vpn_packet (r, si);
708		851
709	delete r;	852	delete r;
710	}	853	}
711		854
712	void	855	inline void
713	connection::establish_connection_cb (time_watcher &w)	856	connection::establish_connection_cb (ev::timer &w, int revents)
714	{	857	{
715	if (ictx || conf == THISNODE	858	if (!(ictx && octx)
		859	&& conf != THISNODE
716	|| connectmode == conf_node::C_NEVER	860	&& connectmode != conf_node::C_NEVER
717	|| connectmode == conf_node::C_DISABLED)	861	&& connectmode != conf_node::C_DISABLED
718	w.at = TSTAMP_CANCEL;	862	&& !w.is_active ())
719	else if (w.at <= NOW)
720	{	863	{
721	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
722		865	// and stop trying. should probably be handled by a per-connection expire handler.
723	if (retry_int < 3600 * 8)	866	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		867	{
		868	reset_connection ("no demand");
724	retry_cnt++;	869	return;
		870	}
725		871
726	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));
727		877
728	reset_si ();	878	reset_si ();
729		879
730	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);
731	vpn->send_connect_request (conf->id);	886	vpn->send_connect_request (this);
		887	}
732	else	888	else
733	{	889	{
		890	if (si.valid ())
		891	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		892	conf->nodename, (const char *)si);
		893
734	const sockinfo &dsi = forward_si (si);	894	const sockinfo &dsi = forward_si (si);
		895
		896	slow = slow || (dsi.prot & PROT_SLOW);
735		897
736	if (dsi.valid () && auth_rate_limiter.can (dsi))	898	if (dsi.valid () && auth_rate_limiter.can (dsi))
737	{	899	{
738	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))
739	send_auth_request (dsi, true);	904	send_auth_request (dsi, true);
740	else	905	else
741	send_ping (dsi, 0);	906	send_ping (dsi, 0);
742	}	907	}
743	}	908	}
744	}
745	}
746		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
747	void	921	void
748	connection::reset_connection ()	922	connection::reset_connection (const char *reason)
749	{	923	{
750	if (ictx && octx)	924	if (ictx && octx)
751	{	925	{
752	slog (L_INFO, _("%s(%s): connection lost"),	926	slog (L_INFO, _("%s(%s): connection lost (%s)"),
753	conf->nodename, (const char *)si);	927	conf->nodename, (const char *)si, reason);
754		928
755	if (::conf.script_node_down)	929	if (::conf.script_node_down)
756	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	}
757	}	935	}
758		936
759	delete ictx; ictx = 0;	937	delete ictx; ictx = 0;
760	delete octx; octx = 0;	938	delete octx; octx = 0;
761		939
762	si.host= 0;	940	si.host = 0;
763		941
		942	have_snd_auth = false;
		943	have_rcv_auth = false;
		944	auth_expire = 0.;
		945
764	last_activity = 0;	946	last_activity = 0.;
		947	//last_si_change = 0.;
765	retry_cnt = 0;	948	retry_cnt = 0;
766		949
767	rekey.reset ();	950	rekey.stop ();
768	keepalive.reset ();	951	keepalive.stop ();
769	establish_connection.reset ();	952	establish_connection.stop ();
770	}	953	}
771		954
772	void	955	void
773	connection::shutdown ()	956	connection::shutdown ()
774	{	957	{
775	if (ictx && octx)	958	if (ictx && octx)
776	send_reset (si);	959	send_reset (si);
777		960
778	reset_connection ();	961	reset_connection ("shutdown");
779	}	962	}
780		963
781	void	964	// poor-man's rekeying
782	connection::rekey_cb (time_watcher &w)	965	inline void
		966	connection::rekey_cb (ev::timer &w, int revents)
783	{	967	{
784	w.at = TSTAMP_CANCEL;
785
786	reset_connection ();	968	reset_connection ("rekeying");
787	establish_connection ();	969	establish_connection ();
788	}	970	}
789		971
790	void	972	void
791	connection::send_data_packet (tap_packet *pkt, bool broadcast)	973	connection::send_data_packet (tap_packet *pkt)
792	{	974	{
793	vpndata_packet *p = new vpndata_packet;	975	vpndata_packet *p = new vpndata_packet;
794	int tos = 0;	976	int tos = 0;
795		977
796	// I am not hilarious about peeking into packets, but so be it.	978	// I am not hilarious about peeking into packets, but so be it.
797	if (conf->inherit_tos	979	if (conf->inherit_tos && pkt->is_ipv4 ())
798	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
799	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
800	tos = (*pkt)[15] & IPTOS_TOS_MASK;	980	tos = (*pkt)[15] & IPTOS_TOS_MASK;
801		981
802	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	982	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
803	send_vpn_packet (p, si, tos);	983	send_vpn_packet (p, si, tos);
804		984
805	delete p;	985	delete p;
806		986
807	if (oseqno > MAX_SEQNO)	987	if (oseqno > MAX_SEQNO)
808	rekey ();	988	rekey ();
809	}	989	}
810		990
811	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
812	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1002	connection::inject_data_packet (tap_packet *pkt)
813	{	1003	{
814	if (ictx && octx)	1004	if (ictx && octx)
815	send_data_packet (pkt, broadcast);	1005	send_data_packet (pkt);
816	else	1006	else
817	{	1007	{
818	if (!broadcast)//DDDD
819	data_queue.put (new tap_packet (*pkt));	1008	data_queue.put (new tap_packet (*pkt));
820		1009	post_inject_queue ();
821	establish_connection ();
822	}	1010	}
823	}	1011	}
824		1012
		1013	void
825	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1014	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
826	{	1015	{
827	if (ictx && octx)	1016	if (ictx && octx)
828	send_vpn_packet (pkt, si, tos);	1017	send_vpn_packet (pkt, si, tos);
829	else	1018	else
830	{	1019	{
831	vpn_queue.put (new vpn_packet (*pkt));	1020	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
832		1021	post_inject_queue ();
833	establish_connection ();
834	}	1022	}
835	}	1023	}
836		1024
837	void	1025	void
838	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1026	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
839	{	1027	{
840	last_activity = NOW;	1028	last_activity = ev_now ();
841		1029
842	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.",
843	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;
844		1035
845	switch (pkt->typ ())	1036	switch (pkt->typ ())
846	{	1037	{
847	case vpn_packet::PT_PING:	1038	case vpn_packet::PT_PING:
		1039	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1040
848	// we send pings instead of auth packets after some retries,	1041	// we send pings instead of auth packets after some retries,
849	// so reset the retry counter and establish a connection	1042	// so reset the retry counter and establish a connection
850	// when we receive a ping.	1043	// when we receive a ping.
851	if (!ictx)	1044	if (!ictx)
852	{	1045	{
853	if (auth_rate_limiter.can (rsi))	1046	if (auth_rate_limiter.can (rsi))
854	send_auth_request (rsi, true);	1047	send_auth_request (rsi, true);
855	}	1048	}
856	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.
857	send_ping (rsi, 1); // pong	1052	send_ping (rsi, 1); // pong
858		1053
859	break;	1054	break;
860		1055
861	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 ();
862	break;	1062	break;
863		1063
864	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)
865	{	1068	{
866	reset_connection ();	1069	reset_connection ("remote reset");
867		1070
868	config_packet *p = (config_packet *) pkt;	1071	config_packet *p = (config_packet *) pkt;
869		1072
870	if (!p->chk_config ())	1073	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
871	{
872	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
873	conf->nodename, (const char *)rsi);
874	connectmode = conf_node::C_DISABLED;
875	}
876	else if (connectmode == conf_node::C_ALWAYS)
877	establish_connection ();	1074	establish_connection ();
878	}	1075	}
		1076
879	break;	1077	break;
880		1078
881	case vpn_packet::PT_AUTH_REQ:	1079	case vpn_packet::PT_AUTH_REQ:
882	if (auth_rate_limiter.can (rsi))	1080	if (auth_rate_limiter.can (rsi))
883	{	1081	{
884	auth_req_packet *p = (auth_req_packet *) pkt;	1082	auth_req_packet *p = (auth_req_packet *)pkt;
885		1083
886	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);
887		1087
888	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))
889	{	1094	{
890	if (p->prot_minor != PROTOCOL_MINOR)	1095	if (p->prot_minor != PROTOCOL_MINOR)
891	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."),
892	conf->nodename, (const char *)rsi,	1097	conf->nodename, (const char *)rsi,
893	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1098	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
894		1099
895	if (p->initiate)	1100	if (p->initiate)
		1101	{
896	send_auth_request (rsi, false);	1102	send_auth_request (rsi, false);
897		1103
898	rsachallenge k;	1104	if (ictx && octx)
		1105	reset_connection ("reconnect");
		1106	}
899		1107
900	if (0 > RSA_private_decrypt (sizeof (p->encr),	1108	auth_data auth;
901	(unsigned char *)&p->encr, (unsigned char *)&k,	1109
902	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1110	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1111	{
903	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1112	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
904	conf->nodename, (const char *)rsi);	1113	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1114	}
905	else	1115	else
906	{	1116	{
907	delete octx;	1117	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
908		1118
909	octx = new crypto_ctx (k, 1);	1119	rcv_auth = auth;
910	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1120	have_rcv_auth = true;
911		1121
		1122	send_auth_response (rsi);
		1123
		1124	if (chg)
		1125	{
912	conf->protocols = p->protocols;	1126	conf->protocols = p->protocols;
		1127	features = p->features & config_packet::get_features ();
913		1128
914	send_auth_response (rsi, p->id, k);
915
916	connection_established ();	1129	connection_established (rsi);
917
918	break;	1130	}
919	}	1131	}
		1132
		1133	break;
920	}	1134	}
921		1135
922	send_reset (rsi);	1136	send_reset (rsi);
923	}	1137	}
924		1138
925	break;	1139	break;
926		1140
927	case vpn_packet::PT_AUTH_RES:	1141	case vpn_packet::PT_AUTH_RES:
928	{	1142	{
929	auth_res_packet *p = (auth_res_packet *) pkt;	1143	auth_res_packet *p = (auth_res_packet *)pkt;
930		1144
931	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1145	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
932		1146
933	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))
934	{	1151	{
935	if (p->prot_minor != PROTOCOL_MINOR)
936	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
937	conf->nodename, (const char *)rsi,
938	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
939
940	rsachallenge chg;
941
942	if (!rsa_cache.find (p->id, chg))
943	slog (L_ERR, _("%s(%s): unrequested auth response"),	1152	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
944	conf->nodename, (const char *)rsi);	1153	conf->nodename, (const char *)rsi);
945	else
946	{
947	crypto_ctx *cctx = new crypto_ctx (chg, 0);
948
949	if (!p->hmac_chk (cctx))
950	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
951	"could be an attack, or just corruption or an synchronization error"),
952	conf->nodename, (const char *)rsi);
953	else
954	{
955	rsaresponse h;
956
957	rsa_hash (p->id, chg, h);
958
959	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
960	{
961	prot_minor = p->prot_minor;
962
963	delete ictx; ictx = cctx;
964
965	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
966
967	si = rsi;
968	protocol = rsi.prot;
969
970	connection_established ();
971
972	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
973	conf->nodename, (const char *)rsi,
974	p->prot_major, p->prot_minor);
975
976	if (::conf.script_node_up)
977	run_script (run_script_cb (this, &connection::script_node_up), false);
978
979	break;
980	}
981	else
982	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
983	conf->nodename, (const char *)rsi);
984	}
985
986	delete cctx;
987	}	1154	}
		1155	else if (!have_snd_auth)
		1156	{
		1157	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1158
		1159	have_snd_auth = true;
		1160	connection_established (rsi);
988	}	1161	}
989	}	1162	}
990
991	send_reset (rsi);
992	break;	1163	break;
993		1164
994	case vpn_packet::PT_DATA_COMPRESSED:	1165	case vpn_packet::PT_DATA_COMPRESSED:
995	#if !ENABLE_COMPRESSION	1166	#if !ENABLE_COMPRESSION
996	send_reset (rsi);	1167	send_reset (rsi);
…		…
1002	if (ictx && octx)	1173	if (ictx && octx)
1003	{	1174	{
1004	vpndata_packet *p = (vpndata_packet *)pkt;	1175	vpndata_packet *p = (vpndata_packet *)pkt;
1005		1176
1006	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	{
1007	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"
1008	"could be an attack, or just corruption or an synchronization error"),	1193	"could be an attack, or just corruption or a synchronization error."),
1009	conf->nodename, (const char *)rsi);	1194	conf->nodename, (const char *)rsi);
		1195	// reset
		1196	}
		1197	}
1010	else	1198	else
1011	{	1199	{
1012	u32 seqno;	1200	u32 seqno;
1013	tap_packet *d = p->unpack (this, seqno);	1201	tap_packet *d = p->unpack (this, seqno);
		1202	int seqclass = iseqno.seqno_classify (seqno);
1014		1203
1015	if (iseqno.recv_ok (seqno))	1204	hmac_error = 0;
		1205
		1206	if (seqclass == 0) // ok
1016	{	1207	{
1017	vpn->tap->send (d);	1208	vpn->tap->send (d);
1018		1209
1019	if (p->dst () == 0) // re-broadcast
1020	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1021	{
1022	connection *c = *i;
1023
1024	if (c->conf != THISNODE && c->conf != conf)
1025	c->inject_data_packet (d);
1026	}
1027
1028	if (si != rsi)	1210	if (si != rsi)
1029	{	1211	{
1030	// fast re-sync on conneciton 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.)
1031	si = rsi;	1214	// {
1032
1033	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1215	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1034	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);
1035	}	1231	}
1036
1037	delete d;
1038
1039	break;
1040	}	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;
1041	}	1248	}
1042	}	1249	}
1043		1250
1044	send_reset (rsi);	1251	send_reset (rsi);
1045	break;	1252	break;
1046		1253
1047	case vpn_packet::PT_CONNECT_REQ:	1254	case vpn_packet::PT_CONNECT_REQ:
1048	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1255	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1049	{	1256	{
1050	connect_req_packet *p = (connect_req_packet *) pkt;	1257	connect_req_packet *p = (connect_req_packet *)pkt;
1051		1258
1052	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 ())
1053	connection *c = vpn->conns[p->id - 1];
1054	conf->protocols = p->protocols;
1055
1056	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1057	conf->id, p->id, c->ictx && c->octx);
1058
1059	if (c->ictx && c->octx)
1060	{	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	{
1061	// send connect_info packets to both sides, in case one is	1271	// send connect_info packets to both sides, in case one is
1062	// behind a nat firewall (or both ;)	1272	// behind a nat firewall (or both ;)
1063	c->send_connect_info (conf->id, si, conf->protocols);	1273	c->send_connect_info (conf->id, si, conf->protocols);
1064	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 ();
1065	}	1278	}
1066	else	1279	else
1067	c->establish_connection ();	1280	slog (L_WARN,
		1281	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1282	p->id);
1068	}	1283	}
1069		1284
1070	break;	1285	break;
1071		1286
1072	case vpn_packet::PT_CONNECT_INFO:	1287	case vpn_packet::PT_CONNECT_INFO:
1073	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1288	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1074	{	1289	{
1075	connect_info_packet *p = (connect_info_packet *) pkt;	1290	connect_info_packet *p = (connect_info_packet *)pkt;
1076		1291
1077	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 ())
1078		1293	{
1079	connection *c = vpn->conns[p->id - 1];	1294	connection *c = vpn->conns[p->id - 1];
1080		1295
1081	c->conf->protocols = p->protocols;	1296	c->conf->protocols = p->protocols;
1082	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));
1083	p->si.upgrade_protocol (protocol, c->conf);	1298	p->si.upgrade_protocol (protocol, c->conf);
1084		1299
1085	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]",
1086	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);
1087		1308
1088	const sockinfo &dsi = forward_si (p->si);	1309	const sockinfo &dsi = forward_si (p->si);
1089		1310
1090	if (dsi.valid ())	1311	if (dsi.valid ())
1091	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);
1092	}	1322	}
1093		1323
1094	break;	1324	break;
1095		1325
1096	default:	1326	default:
1097	send_reset (rsi);	1327	send_reset (rsi);
1098	break;	1328	break;
1099	}	1329	}
1100	}	1330	}
1101		1331
1102	void connection::keepalive_cb (time_watcher &w)	1332	inline void
		1333	connection::keepalive_cb (ev::timer &w, int revents)
1103	{	1334	{
1104	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)
1105	{	1340	{
1106	reset_connection ();	1341	reset_connection ("keepalive overdue");
1107	establish_connection ();	1342	establish_connection ();
1108	}	1343	}
1109	else if (NOW < last_activity + ::conf.keepalive)
1110	w.at = last_activity + ::conf.keepalive;
1111	else if (conf->connectmode != conf_node::C_ONDEMAND	1344	else if (conf->connectmode != conf_node::C_ONDEMAND
1112	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1345	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1113	{	1346	{
		1347	w.start (3);
1114	send_ping (si);	1348	send_ping (si);
1115	w.at = NOW + 5;
1116	}	1349	}
1117	else if (NOW < last_activity + ::conf.keepalive + 10)	1350	else if (when >= -10)
1118	// hold ondemand connections implicitly a few seconds longer	1351	// hold ondemand connections implicitly a few seconds longer
1119	// should delete octx, though, or something like that ;)	1352	// should delete octx, though, or something like that ;)
1120	w.at = last_activity + ::conf.keepalive + 10;	1353	w.start (when + 10);
1121	else	1354	else
1122	reset_connection ();	1355	reset_connection ("keepalive timeout");
1123	}	1356	}
1124		1357
		1358	void
1125	void connection::send_connect_request (int id)	1359	connection::send_connect_request (int id)
1126	{	1360	{
1127	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);
1128		1362
1129	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);
1130	p->hmac_set (octx);	1366	p->hmac_set (octx);
1131	send_vpn_packet (p, si);	1367	send_vpn_packet (p, si);
1132		1368
1133	delete p;	1369	delete p;
1134	}	1370	}
1135		1371
1136	void connection::script_node ()	1372	void
		1373	connection::script_init_env (const char *ext)
1137	{	1374	{
1138	vpn->script_if_up ();
1139
1140	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;
1141	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);
1142	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1391	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1143	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1392	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1144	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1393	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1145	}	1394	}
1146		1395
		1396	inline const char *
1147	const char *connection::script_node_up ()	1397	connection::script_node_up ()
1148	{	1398	{
1149	script_node ();	1399	script_init_connect_env ();
1150		1400
1151	putenv ("STATE=up");	1401	putenv ((char *)"STATE=up");
1152		1402
		1403	char *filename;
		1404	asprintf (&filename,
		1405	"%s/%s",
		1406	confbase,
1153	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1407	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1154	}
1155		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 *
1156	const char *connection::script_node_down ()	1429	connection::script_node_down ()
1157	{	1430	{
1158	script_node ();	1431	script_init_connect_env ();
1159		1432
1160	putenv ("STATE=down");	1433	putenv ((char *)"STATE=down");
1161		1434
1162	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1435	char *filename;
1163	}	1436	asprintf (&filename,
		1437	"%s/%s",
		1438	confbase,
		1439	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1164		1440
		1441	return filename;
		1442	}
		1443
1165	connection::connection(struct vpn *vpn_)	1444	connection::connection (struct vpn *vpn, conf_node *conf)
1166	: vpn(vpn_)	1445	: vpn(vpn), conf(conf),
1167	, rekey (this, &connection::rekey_cb)	1446	#if ENABLE_DNS
1168	, 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);
1169	, establish_connection (this, &connection::establish_connection_cb)	1454	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1170	{	1455
		1456	last_establish_attempt = 0.;
1171	octx = ictx = 0;	1457	octx = ictx = 0;
1172	retry_cnt = 0;
1173		1458
1174	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
1175	reset_connection ();	1465	reset_connection ("startup");
1176	}	1466	}
1177		1467
1178	connection::~connection ()	1468	connection::~connection ()
1179	{	1469	{
1180	shutdown ();	1470	shutdown ();
1181	}	1471	}
1182		1472
		1473	void
1183	void connection_init ()	1474	connection_init ()
1184	{	1475	{
1185	auth_rate_limiter.clear ();	1476	auth_rate_limiter.clear ();
1186	reset_rate_limiter.clear ();	1477	reset_rate_limiter.clear ();
1187	}	1478	}
1188		1479

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