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Comparing gvpe/src/connection.C (file contents):
Revision 1.16 by pcg, Mon Sep 1 15:52:03 2003 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 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) equire (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. / 600.; // 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
…		…
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)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		411
312	struct vpndata_packet:vpn_packet	412	struct vpndata_packet : vpn_packet
		413	{
		414	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
313	{	421	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315
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;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	423	}
		424	};
325		425
326	void	426	void
327	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	427	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
328	{	428	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	430	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
332		432
333	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
335	u32 cl;
336		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
338	if (cl)	440	if (cl)
339	{	441	{
340	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
341	d = cdata;	443	d = cdata;
342	l = cl + 2;	444	l = cl + 2;
343		445
344	d[0] = cl >> 8;	446	d[0] = cl >> 8;
345	d[1] = cl;	447	d[1] = cl;
		448	}
346	}	449	}
347	#endif	450	#endif
348		451
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		453
351	struct {	454	struct {
352	#if RAND_SIZE	455	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
354	#endif	457	#endif
355	u32 seqno;	458	u32 seqno;
356	} datahdr;	459	} datahdr;
357		460
358	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	462	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	463	// NB: a constant (per session) random prefix
		464	// is likely enough, but we don't take any chances.
		465	conn->oiv.get (datahdr.rnd, RAND_SIZE);
361	#endif	466	#endif
362		467
363	EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	470	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	471	outl += outl2;
367		472
368	EVP_EncryptUpdate (cctx,	473	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	474	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	475	(unsigned char *) d, l));
371	outl += outl2;	476	outl += outl2;
372		477
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	478	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	479	outl += outl2;
375		480
376	len = outl + data_hdr_size ();	481	len = outl + data_hdr_size ();
377		482
378	set_hdr (type, dst);	483	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	492	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
389	u8 *d;	494	u8 *d;
390	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
391		496
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		498
394	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
396		501
397	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	503	d = cdata;
399	else	504	else
400	#endif	505	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
402		507
403	/* this overwrites part of the src mac, but we fix that later */	508	// we play do evil games with the struct layout atm.
		509	// pending better solutions, we at least do some verification.
		510	// this is fine, as we left ISO territory long ago.
		511	require (DATAHDR <= 16);
		512	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		513
		514	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	516	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	517	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	518	outl += outl2;
408		519
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	520	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	521	outl += outl2;
411		522
412	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	523	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
413		524
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	525	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	550	}
440	};	551	};
441		552
442	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
443	{	554	{
444	// actually, hmaclen cannot be checked because the hmac	555	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;	556	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	557	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
450		559
451	const u8 curflags () const	560	void setup (ptype type, int dst);
		561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		562
		563	static u8 get_features ()
452	{	564	{
		565	u8 f = 0;
		566	#if ENABLE_COMPRESSION
		567	f |= FEATURE_COMPRESSION;
		568	#endif
		569	#if ENABLE_ROHC
		570	f |= FEATURE_ROHC;
		571	#endif
		572	#if ENABLE_BRIDGING
		573	f |= FEATURE_BRIDGING;
		574	#endif
453	return 0x80	575	return f;
454	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	576	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	577	};
460		578
		579	void
461	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
462	{	581	{
463	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	585	flags = 0;
467	flags = curflags ();	586	features = get_features ();
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	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
481	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
482	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
483	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
484	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
485	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
486	else if (flags != curflags ())
487	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
488	else if (challengelen != sizeof (rsachallenge))
489	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
490	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
491	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	608	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
492	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
493	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
494	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
495	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	611	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		613	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		614	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		615	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
496	else	616	else
		617	{
		618	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		619
		620	if (cmp > 0)
		621	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		622	conf->nodename, (const char *)rsi);
		623	else if (cmp == 0)
497	return true;	624	return true;
		625	}
498		626
499	return false;	627	return false;
500	}	628	}
501		629
502	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
503	{	631	{
504	char magic[8];	632	char magic[8];
505	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
506	u8 protocols; // supported protocols (will get patches on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
507	u8 pad2, pad3;	635	u8 pad2, pad3;
508	rsaid id;	636	auth_encr encr;
509	rsaencrdata encr;
510		637
511	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
512	{	639	{
513	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
514	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
515	initiate = !!initiate_;	642	initiate = !!initiate_;
516	protocols = protocols_;	643	protocols = protocols_;
517		644
518	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
519	}	646	}
520	};	647	};
521		648
522	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
523	{	650	{
524	rsaid id;
525	u8 pad1, pad2, pad3;
526	u8 response_len; // encrypted length
527	rsaresponse response;	651	auth_response response;
528		652
529	auth_res_packet (int dst)	653	auth_res_packet (int dst)
530	{	654	{
531	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
532		656
533	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
534	}	658	}
535	};	659	};
536		660
…		…
566	};	690	};
567		691
568	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
569		693
570	void	694	void
571	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
572	{	696	{
573	if (ictx && octx)	697	if (!have_snd_auth || !have_rcv_auth)
		698	return;
		699
		700	si = rsi;
		701	protocol = rsi.prot;
		702
		703	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		704	conf->nodename, (const char *)rsi,
		705	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		706	PROTOCOL_MAJOR, prot_minor);
		707
		708	if (::conf.script_node_up)
		709	{
		710	run_script_cb *cb = new run_script_cb;
		711	cb->set<connection, &connection::script_node_up> (this);
		712	run_script_queued (cb, _("node-up command execution failed, continuing."));
574	{	713	}
575	connectmode = conf->connectmode;	714
		715	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		716	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
576		717
577	rekey.start (NOW + ::conf.rekey);	718	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		719	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		720
		721	oiv.reset ();
		722
		723	// make sure rekeying timeouts are slightly asymmetric
		724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
578	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
579		730
580	// send queued packets	731	// send queued packets
581	if (ictx && octx)
582	{
583	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
584	{	733	{
585	send_data_packet (p);	734	if (p->len) send_data_packet (p);
586	delete p;	735	delete p;
587	}	736	}
588		737
589	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
590	{	739	{
591	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
592	delete p;	741	delete p;
593	}
594	}
595	}	742	}
		743
		744	vpn->connection_established (this);
		745	}
		746
		747	void
		748	connection::reset_si ()
		749	{
		750	if (vpn->can_direct (THISNODE, conf))
		751	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
596	else	752	else
597	{	753	{
598	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
599	establish_connection.start (NOW + 5);	755	protocol = 0;
600	keepalive.reset ();
601	rekey.reset ();
602	}	756	}
603	}
604
605	void
606	connection::reset_si ()
607	{
608	protocol = best_protocol (THISNODE->protocols & conf->protocols);
609
610	// mask out protocols we cannot establish
611	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
612	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
613		757
614	si.set (conf, protocol);	758	si.set (conf, protocol);
615	}	759	}
616		760
617	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
618	const sockinfo &	762	const sockinfo &
619	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
620	{	764	{
621	if (!si.valid ())	765	if (!si.valid ())
622	{	766	{
623	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
624		768
625	if (r)	769	if (r)
626	{	770	{
627	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
628	conf->nodename, r->conf->nodename);	772	conf->nodename, r->conf->nodename);
629	return r->si;	773	return r->si;
630	}	774	}
631	else	775	else
632	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
633	conf->nodename);	777	conf->nodename);
634	}	778	}
635		779
636	return si;	780	return si;
637	}	781	}
638		782
639	void	783	void
640	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	784	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
641	{	785	{
642	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
643	reset_connection ();	787	reset_connection ("packet send error");
644	}	788	}
645		789
646	void	790	void
647	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
648	{	792	{
649	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
650		794
651	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	795	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		796
		797	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
652	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
653		799
654	delete pkt;	800	delete pkt;
655	}	801	}
656		802
…		…
671	void	817	void
672	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
673	{	819	{
674	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	820	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
675		821
676	rsachallenge chg;	822	generate_auth_data ();
		823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
677		824
678	rsa_cache.gen (pkt->id, chg);
679
680	if (0 > RSA_public_encrypt (sizeof chg,
681	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
682	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
683	fatal ("RSA_public_encrypt error");
684
685	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	825	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
686
687	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	826	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
688		827
689	delete pkt;	828	delete pkt;
690	}	829	}
691		830
692	void	831	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
694	{	833	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		835
697	pkt->id = id;	836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		837	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
698		838
699	rsa_hash (id, chg, pkt->response);
700
701	pkt->hmac_set (octx);
702
703	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	839	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
704
705	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	840	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
706		841
707	delete pkt;	842	delete pkt;
708	}	843	}
709		844
710	void	845	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	847	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
715		851
716	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	852	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717		853
718	r->hmac_set (octx);	854	r->hmac_set (octx);
719	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
720		856
721	delete r;	857	delete r;
722	}	858	}
723		859
724	void	860	inline void
725	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	862	{
727	if (ictx || conf == THISNODE	863	if (!(ictx && octx)
		864	&& conf != THISNODE
728	|| connectmode == conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
729	|| connectmode == conf_node::C_DISABLED)	866	&& connectmode != conf_node::C_DISABLED
730	w.at = TSTAMP_CANCEL;	867	&& !w.is_active ())
731	else if (w.at <= NOW)
732	{	868	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	869	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		870	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
736	retry_cnt++;	874	return;
		875	}
737		876
738	w.at = NOW + retry_int;	877	last_establish_attempt = ev_now ();
		878
		879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		880	? (retry_cnt & 3) + 1
		881	: 1 << (retry_cnt >> 2));
739		882
740	reset_si ();	883	reset_si ();
741		884
742	if (si.prot && !si.host)	885	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
		886
		887	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		888	{
		889	/*TODO*/ /* start the timer so we don't recurse endlessly */
		890	w.start (1);
743	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
744	else	893	else
745	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
746	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow || (dsi.prot & PROT_SLOW);
747		902
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	904	{
750	if (retry_cnt < 4)	905	// use ping after the first few retries
		906	// TODO: on rekeys, the other node might not interpret ping correctly,
		907	// TODO: as it will still have a valid connection
		908	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
751	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
752	else	910	else
753	send_ping (dsi, 0);	911	send_ping (dsi, 0);
754	}	912	}
755	}	913	}
756	}
757	}
758		914
		915	retry_int *= slow ? 4. : 0.9;
		916
		917	if (retry_int < conf->max_retry)
		918	retry_cnt++;
		919	else
		920	retry_int = conf->max_retry;
		921
		922	w.start (retry_int);
		923	}
		924	}
		925
759	void	926	void
760	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
761	{	928	{
762	if (ictx && octx)	929	if (ictx && octx)
763	{	930	{
764	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
765	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
766		933
767	if (::conf.script_node_down)	934	if (::conf.script_node_down)
768	run_script (run_script_cb (this, &connection::script_node_down), false);	935	{
		936	run_script_cb *cb = new run_script_cb;
		937	cb->set<connection, &connection::script_node_down> (this);
		938	run_script_queued (cb, _("node-down command execution failed, continuing."));
		939	}
769	}	940	}
770		941
771	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
772	delete octx; octx = 0;	943	delete octx; octx = 0;
773		944
774	si.host= 0;	945	si.host = 0;
775		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
776	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
777	retry_cnt = 0;	953	retry_cnt = 0;
778		954
779	rekey.reset ();	955	rekey.stop ();
780	keepalive.reset ();	956	keepalive.stop ();
781	establish_connection.reset ();	957	establish_connection.stop ();
782	}	958	}
783		959
784	void	960	void
785	connection::shutdown ()	961	connection::shutdown ()
786	{	962	{
787	if (ictx && octx)	963	if (ictx && octx)
788	send_reset (si);	964	send_reset (si);
789		965
790	reset_connection ();	966	reset_connection ("shutdown");
791	}	967	}
792		968
793	void	969	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
795	{	972	{
796	w.at = TSTAMP_CANCEL;
797
798	reset_connection ();	973	reset_connection ("rekeying");
799	establish_connection ();	974	establish_connection ();
800	}	975	}
801		976
802	void	977	void
803	connection::send_data_packet (tap_packet *pkt, bool broadcast)	978	connection::send_data_packet (tap_packet *pkt)
804	{	979	{
805	vpndata_packet *p = new vpndata_packet;	980	vpndata_packet *p = new vpndata_packet;
806	int tos = 0;	981	int tos = 0;
807		982
808	// I am not hilarious about peeking into packets, but so be it.	983	// I am not hilarious about peeking into packets, but so be it.
809	if (conf->inherit_tos	984	if (conf->inherit_tos && pkt->is_ipv4 ())
810	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
811	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
812	tos = (*pkt)[15] & IPTOS_TOS_MASK;	985	tos = (*pkt)[15] & IPTOS_TOS_MASK;
813		986
814	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	987	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815	send_vpn_packet (p, si, tos);	988	send_vpn_packet (p, si, tos);
816		989
817	delete p;	990	delete p;
818		991
819	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
820	rekey ();	993	rekey ();
821	}	994	}
822		995
823	void	996	void
		997	connection::post_inject_queue ()
		998	{
		999	// force a connection every now and when when packets are sent (max 1/s)
		1000	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1001	establish_connection.stop ();
		1002
		1003	establish_connection ();
		1004	}
		1005
		1006	void
824	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1007	connection::inject_data_packet (tap_packet *pkt)
825	{	1008	{
826	if (ictx && octx)	1009	if (ictx && octx)
827	send_data_packet (pkt, broadcast);	1010	send_data_packet (pkt);
828	else	1011	else
829	{	1012	{
830	if (!broadcast)//DDDD
831	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
832		1014	post_inject_queue ();
833	establish_connection ();
834	}	1015	}
835	}	1016	}
836		1017
		1018	void
837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
838	{	1020	{
839	if (ictx && octx)	1021	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
841	else	1023	else
842	{	1024	{
843	vpn_queue.put (new vpn_packet (*pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
844		1026	post_inject_queue ();
845	establish_connection ();
846	}	1027	}
847	}	1028	}
848		1029
849	void	1030	void
850	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
851	{	1032	{
852	last_activity = NOW;	1033	last_activity = ev_now ();
853		1034
854	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1035	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1036	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1037
		1038	if (connectmode == conf_node::C_DISABLED)
		1039	return;
856		1040
857	switch (pkt->typ ())	1041	switch (pkt->typ ())
858	{	1042	{
859	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
860	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
861	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
862	// when we receive a ping.	1048	// when we receive a ping.
863	if (!ictx)	1049	if (!ictx)
864	{	1050	{
865	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
866	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
867	}	1053	}
868	else	1054	else
		1055	// we would love to change the socket address here, but ping's aren't
		1056	// authenticated, so we best ignore it.
869	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
870		1058
871	break;	1059	break;
872		1060
873	case vpn_packet::PT_PONG:	1061	case vpn_packet::PT_PONG:
		1062	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1063
		1064	// a PONG might mean that the other side doesn't really know
		1065	// about our desire for communication.
		1066	establish_connection ();
874	break;	1067	break;
875		1068
876	case vpn_packet::PT_RESET:	1069	case vpn_packet::PT_RESET:
		1070	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1071
		1072	if (ictx && octx)
877	{	1073	{
878	reset_connection ();	1074	reset_connection ("remote reset");
879		1075
880	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
881		1077
882	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
883	{
884	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
885	conf->nodename, (const char *)rsi);
886	connectmode = conf_node::C_DISABLED;
887	}
888	else if (connectmode == conf_node::C_ALWAYS)
889	establish_connection ();	1079	establish_connection ();
890	}	1080	}
		1081
891	break;	1082	break;
892		1083
893	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
894	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
895	{	1086	{
896	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
897		1088
898	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1089	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1090	conf->nodename, p->initiate ? "initiate" : "reply",
		1091	p->protocols, p->features);
899		1092
900	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1093	if (memcmp (p->magic, MAGIC, 8))
		1094	{
		1095	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1096	conf->nodename, (const char *)rsi);
		1097	}
		1098	else if (p->chk_config (conf, rsi))
901	{	1099	{
902	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
903	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1101	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
904	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
906		1104
907	if (p->initiate)	1105	if (p->initiate)
		1106	{
908	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
909		1108
910	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
911		1112
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	1113	auth_data auth;
913	(unsigned char *)&p->encr, (unsigned char *)&k,	1114
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1116	{
915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1117	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916	conf->nodename, (const char *)rsi);	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1119	}
917	else	1120	else
918	{	1121	{
919	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
920		1123
921	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
922	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
923		1126
		1127	send_auth_response (rsi);
		1128
		1129	if (chg)
		1130	{
924	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
		1132	features = p->features & config_packet::get_features ();
925		1133
926	send_auth_response (rsi, p->id, k);
927
928	connection_established ();	1134	connection_established (rsi);
929
930	break;	1135	}
931	}	1136	}
		1137
		1138	break;
932	}	1139	}
933	else
934	slog (L_WARN, _("%s(%s): protocol mismatch"),
935	conf->nodename, (const char *)rsi);
936		1140
937	send_reset (rsi);	1141	send_reset (rsi);
938	}	1142	}
939		1143
940	break;	1144	break;
941		1145
942	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
943	{	1147	{
944	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
945		1149
946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
947		1151
948	if (p->chk_config ())	1152	auth_mac local_mac;
		1153	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1154
		1155	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
949	{	1156	{
950	if (p->prot_minor != PROTOCOL_MINOR)
951	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
952	conf->nodename, (const char *)rsi,
953	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
954
955	rsachallenge chg;
956
957	if (!rsa_cache.find (p->id, chg))
958	{
959	slog (L_ERR, _("%s(%s): unrequested auth response"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
960	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
961	break;
962	}	1159	}
963	else	1160	else if (!have_snd_auth)
964	{	1161	{
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
966		1163
967	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
968	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
969	"could be an attack, or just corruption or an synchronization error"),
970	conf->nodename, (const char *)rsi);
971	else
972	{
973	rsaresponse h;
974
975	rsa_hash (p->id, chg, h);
976
977	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
978	{
979	prot_minor = p->prot_minor;
980
981	delete ictx; ictx = cctx;
982
983	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984
985	si = rsi;
986	protocol = rsi.prot;
987
988	connection_established ();	1165	connection_established (rsi);
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}
1006	}	1166	}
1007	}	1167	}
1008
1009	send_reset (rsi);
1010	break;	1168	break;
1011		1169
1012	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1013	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1014	send_reset (rsi);	1172	send_reset (rsi);
…		…
1020	if (ictx && octx)	1178	if (ictx && octx)
1021	{	1179	{
1022	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1023		1181
1024	if (!p->hmac_chk (ictx))	1182	if (!p->hmac_chk (ictx))
		1183	{
		1184	// rekeying often creates temporary hmac auth floods
		1185	// we assume they don't take longer than a few seconds normally,
		1186	// and suppress messages and resets during that time.
		1187	//TODO: should be done per source address
		1188	if (!hmac_error)
		1189	{
		1190	hmac_error = ev_now () + 3;
		1191	break;
		1192	}
		1193	else if (hmac_error >= ev_now ())
		1194	break; // silently suppress
		1195	else
		1196	{
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1197	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1028	else	1203	else
1029	{	1204	{
1030	u32 seqno;	1205	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1032		1208
1033	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1034	{	1212	{
1035	vpn->tap->send (d);	1213	vpn->tap->send (d);
1036		1214
1037	if (p->dst () == 0) // re-broadcast
1038	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1039	{
1040	connection *c = *i;
1041
1042	if (c->conf != THISNODE && c->conf != conf)
1043	c->inject_data_packet (d);
1044	}
1045
1046	if (si != rsi)	1215	if (si != rsi)
1047	{	1216	{
1048	// fast re-sync on connection changes, useful especially for tcp/ip	1217	// fast re-sync on source address changes, useful especially for tcp/ip
		1218	//if (last_si_change < ev_now () + 5.)
1049	si = rsi;	1219	// {
1050
1051	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1052	conf->nodename, (const char *)si, (const char *)rsi);	1221	conf->nodename, (const char *)si, (const char *)rsi);
		1222
		1223	si = rsi;
		1224
		1225	if (::conf.script_node_change)
		1226	{
		1227	run_script_cb *cb = new run_script_cb;
		1228	cb->set<connection, &connection::script_node_change> (this);
		1229	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1230	}
		1231
		1232	// }
		1233	//else
		1234	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1235	// conf->nodename, (const char *)si, (const char *)rsi);
1053	}	1236	}
1054
1055	delete d;
1056
1057	break;
1058	}	1237	}
		1238	else if (seqclass == 1) // far history
		1239	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1240	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1241	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1242	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1243	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1244	else if (seqclass == 3) // reset
		1245	{
		1246	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1247	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1248	send_reset (rsi);
		1249	}
		1250
		1251	delete d;
		1252	break;
1059	}	1253	}
1060	}	1254	}
1061		1255
1062	send_reset (rsi);	1256	send_reset (rsi);
1063	break;	1257	break;
1064		1258
1065	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1066	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1067	{	1261	{
1068	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1069		1263
1070	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1264	if (p->id > 0 && p->id <= vpn->conns.size ())
1071	connection *c = vpn->conns[p->id - 1];
1072	conf->protocols = p->protocols;
1073
1074	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1075	conf->id, p->id, c->ictx && c->octx);
1076
1077	if (c->ictx && c->octx)
1078	{	1265	{
		1266	connection *c = vpn->conns[p->id - 1];
		1267	conf->protocols = p->protocols;
		1268
		1269	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1270	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1271	p->protocols,
		1272	c->ictx && c->octx);
		1273
		1274	if (c->ictx && c->octx)
		1275	{
1079	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1080	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1081	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1082	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1279	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1280	}
		1281	else
		1282	c->establish_connection ();
1083	}	1283	}
1084	else	1284	else
1085	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1086	}	1288	}
1087		1289
1088	break;	1290	break;
1089		1291
1090	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1091	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1092	{	1294	{
1093	connect_info_packet *p = (connect_info_packet *) pkt;	1295	connect_info_packet *p = (connect_info_packet *)pkt;
1094		1296
1095	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1297	if (p->id > 0 && p->id <= vpn->conns.size ())
1096		1298	{
1097	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1098		1300
1099	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1100	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1302	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1101	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1102		1304
1103	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1305	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1104	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1306	conf->nodename,
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si,
		1309	p->protocols,
		1310	protocol,
		1311	p->si.supported_protocols (c->conf),
		1312	!c->ictx && !c->octx);
1105		1313
1106	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1107		1315
1108	if (dsi.valid ())	1316	if (dsi.valid ())
1109	c->send_auth_request (dsi, true);	1317	c->send_auth_request (dsi, true);
		1318	else
		1319	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si);
		1322	}
		1323	else
		1324	slog (L_WARN,
		1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1326	p->id);
1110	}	1327	}
1111		1328
1112	break;	1329	break;
1113		1330
1114	default:	1331	default:
1115	send_reset (rsi);	1332	send_reset (rsi);
1116	break;	1333	break;
1117	}	1334	}
1118	}	1335	}
1119		1336
1120	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1121	{	1339	{
1122	if (NOW >= last_activity + ::conf.keepalive + 30)	1340	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1341
		1342	if (when >= 0)
		1343	w.start (when);
		1344	else if (when < -15)
1123	{	1345	{
1124	reset_connection ();	1346	reset_connection ("keepalive overdue");
1125	establish_connection ();	1347	establish_connection ();
1126	}	1348	}
1127	else if (NOW < last_activity + ::conf.keepalive)
1128	w.at = last_activity + ::conf.keepalive;
1129	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1130	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1131	{	1351	{
		1352	w.start (3);
1132	send_ping (si);	1353	send_ping (si);
1133	w.at = NOW + 5;
1134	}	1354	}
1135	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1136	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1137	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1138	w.at = last_activity + ::conf.keepalive + 10;	1358	w.start (when + 10);
1139	else	1359	else
1140	reset_connection ();	1360	reset_connection ("keepalive timeout");
1141	}	1361	}
1142		1362
		1363	void
1143	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1144	{	1365	{
1145	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1366	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1146		1367
1147	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1368	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1369	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1370	THISNODE->protocols);
1148	p->hmac_set (octx);	1371	p->hmac_set (octx);
1149	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1150		1373
1151	delete p;	1374	delete p;
1152	}	1375	}
1153		1376
1154	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1155	{	1379	{
1156	vpn->script_if_up ();
1157
1158	char *env;	1380	char *env;
		1381	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1382	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1383	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1384	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1385	conf->id & 0xff); putenv (env);
		1386	}
		1387
		1388	void
		1389	connection::script_init_connect_env ()
		1390	{
		1391	vpn->script_init_env ();
		1392
		1393	char *env;
1159	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1394	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1395	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1160	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1161	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1162	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1163	}	1399	}
1164		1400
		1401	inline const char *
1165	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1166	{	1403	{
1167	script_node ();	1404	script_init_connect_env ();
1168		1405
1169	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1170		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1171	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1172	}
1173		1413
		1414	return filename;
		1415	}
		1416
		1417	inline const char *
		1418	connection::script_node_change ()
		1419	{
		1420	script_init_connect_env ();
		1421
		1422	putenv ((char *)"STATE=change");
		1423
		1424	char *filename;
		1425	asprintf (&filename,
		1426	"%s/%s",
		1427	confbase,
		1428	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1429
		1430	return filename;
		1431	}
		1432
		1433	inline const char *
1174	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1175	{	1435	{
1176	script_node ();	1436	script_init_connect_env ();
1177		1437
1178	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1179		1439
1180	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
1181	}	1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1182		1445
		1446	return filename;
		1447	}
		1448
1183	connection::connection(struct vpn *vpn_)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1184	: vpn(vpn_)	1450	: vpn(vpn), conf(conf),
1185	, rekey (this, &connection::rekey_cb)	1451	#if ENABLE_DNS
1186	, keepalive (this, &connection::keepalive_cb)	1452	dns (0),
		1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
1187	, establish_connection (this, &connection::establish_connection_cb)	1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1188	{	1460
		1461	last_establish_attempt = 0.;
1189	octx = ictx = 0;	1462	octx = ictx = 0;
1190	retry_cnt = 0;
1191		1463
1192	connectmode = conf_node::C_ALWAYS; // initial setting	1464	connectmode = conf->connectmode;
		1465
		1466	// queue a dummy packet to force an initial connection attempt
		1467	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1468	vpn_queue.put (new net_packet);
		1469
1193	reset_connection ();	1470	reset_connection ("startup");
1194	}	1471	}
1195		1472
1196	connection::~connection ()	1473	connection::~connection ()
1197	{	1474	{
1198	shutdown ();	1475	shutdown ();
1199	}	1476	}
1200		1477
		1478	void
1201	void connection_init ()	1479	connection_init ()
1202	{	1480	{
1203	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1204	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1205	}	1483	}
1206		1484

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