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Comparing gvpe/src/connection.C (file contents):
Revision 1.28 by pcg, Tue Jan 27 05:56:35 2004 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	extern "C" {
23	# include "lzf/lzf.h"
24	}
25
26	#include <cassert>
27
28	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
29		37
		38	#include <openssl/opensslv.h>
30	#include <openssl/rand.h>	39	#include <openssl/rand.h>
31	#include <openssl/evp.h>	40	#include <openssl/evp.h>
32	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
33	#include <openssl/err.h>	42	#include <openssl/err.h>
34		43
35	#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
36		50
37	#include "conf.h"	51	#include "conf.h"
38	#include "slog.h"	52	#include "slog.h"
39	#include "device.h"	53	#include "device.h"
40	#include "vpn.h"	54	#include "vpn.h"
41	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
42		57
43	#include "netcompat.h"	58	#include "netcompat.h"
44		59
45	#if !HAVE_RAND_PSEUDO_BYTES
46	# define RAND_pseudo_bytes RAND_bytes
47	#endif
48
49	#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	//////////////////////////////////////////////////////////////////////////////
50		111
51	struct crypto_ctx	112	struct crypto_ctx
52	{	113	{
53	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	115	HMAC_CTX hctx;
55		116
56	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);
57	~crypto_ctx ();	118	~crypto_ctx ();
58	};	119	};
59		120
60	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)
61	{	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
62	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
63	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	153	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	154	}
67		155
68	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
69	{	157	{
70	EVP_CIPHER_CTX_cleanup (&cctx);	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
72	}	160	}
73		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
74	static void	189	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	191	{
77	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
80	EVP_DigestInit (&ctx, RSA_HASH);	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
82	EVP_DigestUpdate(&ctx, &id, sizeof id);
83	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
84	EVP_MD_CTX_cleanup (&ctx);
85	}	196	}
86		197
87	struct rsa_entry {	198	void
88	tstamp expire;	199	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	200	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
102	{
103	memcpy (&chg, &i->chg, sizeof chg);
104
105	erase (i);
106	return true;
107	}
108	}
109
110	if (cleaner.at < NOW)
111	cleaner.start (NOW + RSA_TTL);
112
113	return false;
114	}
115
116	void gen (rsaid &id, rsachallenge &chg)
117	{
118	rsa_entry e;
119
120	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122
123	e.expire = NOW + RSA_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (cleaner.at < NOW)
130	cleaner.start (NOW + RSA_TTL);
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
136		206
137	} rsa_cache;	207	// eventual response data
138		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{	209	}
143	w.start (NOW + RSA_TTL);
144		210
145	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
146	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
147	i = erase (i);
148	else
149	++i;
150	}
151	}	213	}
152		214
153	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
154		216
155	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
156	{	219	{
157	if (queue[i])	220	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		221
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	222	i = 0;
185	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	226	}
187		227
188	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
189	{	229	{
190	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
191	delete queue[i];	233	delete [] queue;
192	}	234	}
193		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
		290	}
		291
194	struct net_rateinfo {	292	struct net_rateinfo
		293	{
195	u32 host;	294	u32 host;
196	double pcnt, diff;	295	double pcnt, diff;
197	tstamp last;	296	tstamp last;
198	};	297	};
199		298
200	// only do action once every x seconds per host whole allowing bursts.	299	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	300	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	301	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	302	struct net_rate_limiter : list<net_rateinfo>
204	{	303	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	304	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	305	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	306	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	307	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		308
210	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	310	bool can (u32 host);
212	};	311	};
213		312
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		314
		315	bool
216	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
217	{	317	{
218	iterator i;	318	iterator i;
219		319
220	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
221	if (i->host == host)	321	if (i->host == host)
222	break;	322	break;
223	else if (i->last < NOW - EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	324	i = erase (i);
225	else	325	else
226	i++;	326	i++;
227		327
228	if (i == end ())	328	if (i == end ())
229	{	329	{
230	net_rateinfo ri;	330	net_rateinfo ri;
231		331
232	ri.host = host;	332	ri.host = host;
233	ri.pcnt = 1.;	333	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	334	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	335	ri.last = ev_now ();
236		336
237	push_front (ri);	337	push_front (ri);
238		338
239	return true;	339	return true;
240	}	340	}
241	else	341	else
242	{	342	{
243	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
244	erase (i);	344	erase (i);
245		345
246	ri.pcnt = ri.pcnt * ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		348
249	ri.last = NOW;	349	ri.last = ev_now ();
250		350
251	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
252		352
253	bool send = dif > CUTOFF;	353	bool send = dif > NRL_CUTOFF;
254		354
255	if (dif > MAXDIF)	355	if (dif > NRL_MAXDIF)
256	{	356	{
257	ri.pcnt = 1.;	357	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	358	ri.diff = NRL_MAXDIF;
259	}	359	}
260	else if (send)	360	else if (send)
261	ri.pcnt++;	361	ri.pcnt++;
262		362
263	push_front (ri);	363	push_front (ri);
…		…
266	}	366	}
267	}	367	}
268		368
269	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
270		370
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
274	{	373	{
275	unsigned int xlen;
276
277	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
278		375
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
281	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	379	}
284		380
285	void	381	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	383	{
288	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		385	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	387	}
292		388
293	bool	389	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	391	{
296	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		393	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
299	}	395	}
300		396
		397	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	399	{
303	type = type_;	400	type = type_;
304		401
305	int src = THISNODE->id;	402	int src = THISNODE->id;
306		403
…		…
311		408
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		411
315	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
316	{	421	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	423	}
		424	};
328		425
329	void	426	void
330	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)
331	{	428	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
333	int outl = 0, outl2;	430	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
335		432
336	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
338	u32 cl;
339		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
341	if (cl)	440	if (cl)
342	{	441	{
343	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
344	d = cdata;	443	d = cdata;
345	l = cl + 2;	444	l = cl + 2;
346		445
347	d[0] = cl >> 8;	446	d[0] = cl >> 8;
348	d[1] = cl;	447	d[1] = cl;
		448	}
349	}	449	}
350	#endif	450	#endif
351		451
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
353		453
354	struct {	454	struct {
355	#if RAND_SIZE	455	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
357	#endif	457	#endif
358	u32 seqno;	458	u32 seqno;
359	} datahdr;	459	} datahdr;
360		460
361	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE	462	#if RAND_SIZE
363	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);
364	#endif	466	#endif
365		467
366	EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	470	(unsigned char *) &datahdr, DATAHDR));
369	outl += outl2;	471	outl += outl2;
370		472
371	EVP_EncryptUpdate (cctx,	473	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	474	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) d, l);	475	(unsigned char *) d, l));
374	outl += outl2;	476	outl += outl2;
375		477
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	478	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377	outl += outl2;	479	outl += outl2;
378		480
379	len = outl + data_hdr_size ();	481	len = outl + data_hdr_size ();
380		482
381	set_hdr (type, dst);	483	set_hdr (type, dst);
…		…
390	int outl = 0, outl2;	492	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
392	u8 *d;	494	u8 *d;
393	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
394		496
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
396		498
397	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
399		501
400	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
401	d = cdata;	503	d = cdata;
402	else	504	else
403	#endif	505	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
405		507
406	/* 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
407	EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	516	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	517	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	518	outl += outl2;
411		519
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	520	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	521	outl += outl2;
414		522
415	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	523	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
416		524
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	525	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
442	}	550	}
443	};	551	};
444		552
445	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
446	{	554	{
447	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
448	// field comes before this data, so peers with other
449	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
451	u8 flags, challengelen, pad2, pad3;	557	u8 flags, features, pad6, pad7, pad8;
452	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
453		559
454	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 ()
455	{	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
456	return 0x80	575	return f;
457	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}	576	}
459
460	void setup (ptype type, int dst);
461	bool chk_config () const;
462	};	577	};
463		578
		579	void
464	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
465	{	581	{
466	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
469	hmaclen = HMACLENGTH;	585	flags = 0;
470	flags = curflags ();	586	features = get_features ();
471	challengelen = sizeof (rsachallenge);
472		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
476		593
477	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
478	set_hdr (type, dst);	595	set_hdr (type, dst);
479	}	596	}
480		597
481	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
482	{	600	{
483	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
485	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
487	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	608	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
496	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
497	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
498	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	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 ()));
499	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)
500	return true;	624	return true;
		625	}
501		626
502	return false;	627	return false;
503	}	628	}
504		629
505	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
506	{	631	{
507	char magic[8];	632	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	635	u8 pad2, pad3;
511	rsaid id;	636	auth_encr encr;
512	rsaencrdata encr;
513		637
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	639	{
516	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
518	initiate = !!initiate_;	642	initiate = !!initiate_;
519	protocols = protocols_;	643	protocols = protocols_;
520		644
521	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
522	}	646	}
523	};	647	};
524		648
525	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
526	{	650	{
527	rsaid id;
528	u8 pad1, pad2, pad3;
529	u8 response_len; // encrypted length
530	rsaresponse response;	651	auth_response response;
531		652
532	auth_res_packet (int dst)	653	auth_res_packet (int dst)
533	{	654	{
534	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
535		656
536	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
537	}	658	}
538	};	659	};
539		660
…		…
569	};	690	};
570		691
571	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
572		693
573	void	694	void
574	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
575	{	696	{
576	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."));
577	{	713	}
578	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);
579		717
580	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
581	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
582		730
583	// send queued packets	731	// send queued packets
584	if (ictx && octx)
585	{
586	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
587	{	733	{
588	send_data_packet (p);	734	if (p->len) send_data_packet (p);
589	delete p;	735	delete p;
590	}	736	}
591		737
592	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
593	{	739	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;	741	delete p;
596	}
597	}
598	}	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 ());
599	else	752	else
600	{	753	{
601	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
602	establish_connection.start (NOW + 5);	755	protocol = 0;
603	keepalive.stop ();
604	rekey.stop ();
605	}	756	}
606	}
607
608	void
609	connection::reset_si ()
610	{
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);
612
613	// mask out protocols we cannot establish
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
616		757
617	si.set (conf, protocol);	758	si.set (conf, protocol);
618	}	759	}
619		760
620	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	762	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
623	{	764	{
624	if (!si.valid ())	765	if (!si.valid ())
625	{	766	{
626	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
627		768
628	if (r)	769	if (r)
629	{	770	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	772	conf->nodename, r->conf->nodename);
632	return r->si;	773	return r->si;
633	}	774	}
634	else	775	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	777	conf->nodename);
637	}	778	}
638		779
639	return si;	780	return si;
640	}	781	}
641		782
642	void	783	void
643	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)
644	{	785	{
645	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
646	reset_connection ();	787	reset_connection ("packet send error");
647	}	788	}
648		789
649	void	790	void
650	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
651	{	792	{
652	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
653		794
654	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);
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		799
657	delete pkt;	800	delete pkt;
658	}	801	}
659		802
…		…
674	void	817	void
675	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
676	{	819	{
677	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);
678		821
679	rsachallenge chg;	822	generate_auth_data ();
680	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
682		824
683	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);
684
685	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
686		827
687	delete pkt;	828	delete pkt;
688	}	829	}
689		830
690	void	831	void
691	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
692	{	833	{
693	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
694		835
695	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);
696		838
697	rsa_hash (id, chg, pkt->response);
698
699	pkt->hmac_set (octx);
700
701	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	839	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
702
703	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	840	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704		841
705	delete pkt;	842	delete pkt;
706	}	843	}
707		844
708	void	845	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	847	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
713		851
714	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);
715		853
716	r->hmac_set (octx);	854	r->hmac_set (octx);
717	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
718		856
719	delete r;	857	delete r;
720	}	858	}
721		859
722	void	860	inline void
723	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	862	{
725	if (!ictx	863	if (!(ictx && octx)
726	&& conf != THISNODE	864	&& conf != THISNODE
727	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
728	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
729	&& NOW > w.at)	867	&& !w.is_active ())
730	{	868	{
731	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
732		870	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
734	retry_cnt++;	874	return;
		875	}
735		876
736	w.start (NOW + retry_int);	877	last_establish_attempt = ev_now ();
		878
		879	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		880	? (retry_cnt & 3) + 1
		881	: 1 << (retry_cnt >> 2));
737		882
738	reset_si ();	883	reset_si ();
739		884
740	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);
741	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
742	else	893	else
743	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
744	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow || (dsi.prot & PROT_SLOW);
745		902
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	904	{
748	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))
749	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
750	else	910	else
751	send_ping (dsi, 0);	911	send_ping (dsi, 0);
752	}	912	}
753	}	913	}
754	}
755	}
756		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
757	void	926	void
758	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
759	{	928	{
760	if (ictx && octx)	929	if (ictx && octx)
761	{	930	{
762	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
763	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
764		933
765	if (::conf.script_node_down)	934	if (::conf.script_node_down)
766	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	}
767	}	940	}
768		941
769	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
770	delete octx; octx = 0;	943	delete octx; octx = 0;
771		944
772	si.host= 0;	945	si.host = 0;
773		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
774	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
775	retry_cnt = 0;	953	retry_cnt = 0;
776		954
777	rekey.stop ();	955	rekey.stop ();
778	keepalive.stop ();	956	keepalive.stop ();
779	establish_connection.stop ();	957	establish_connection.stop ();
…		…
783	connection::shutdown ()	961	connection::shutdown ()
784	{	962	{
785	if (ictx && octx)	963	if (ictx && octx)
786	send_reset (si);	964	send_reset (si);
787		965
788	reset_connection ();	966	reset_connection ("shutdown");
789	}	967	}
790		968
791	void	969	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
793	{	972	{
794	reset_connection ();	973	reset_connection ("rekeying");
795	establish_connection ();	974	establish_connection ();
796	}	975	}
797		976
798	void	977	void
799	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
813	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
814	rekey ();	993	rekey ();
815	}	994	}
816		995
817	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
818	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
819	{	1008	{
820	if (ictx && octx)	1009	if (ictx && octx)
821	send_data_packet (pkt);	1010	send_data_packet (pkt);
822	else	1011	else
823	{	1012	{
824	if (!broadcast)//DDDD
825	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
826		1014	post_inject_queue ();
827	establish_connection ();
828	}	1015	}
829	}	1016	}
830		1017
		1018	void
831	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832	{	1020	{
833	if (ictx && octx)	1021	if (ictx && octx)
834	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
835	else	1023	else
836	{	1024	{
837	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
838		1026	post_inject_queue ();
839	establish_connection ();
840	}	1027	}
841	}	1028	}
842		1029
843	void	1030	void
844	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
845	{	1032	{
846	last_activity = NOW;	1033	last_activity = ev_now ();
847		1034
848	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.",
849	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;
850		1040
851	switch (pkt->typ ())	1041	switch (pkt->typ ())
852	{	1042	{
853	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
854	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
855	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
856	// when we receive a ping.	1048	// when we receive a ping.
857	if (!ictx)	1049	if (!ictx)
858	{	1050	{
859	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
860	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
861	}	1053	}
862	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.
863	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
864		1058
865	break;	1059	break;
866		1060
867	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 ();
868	break;	1067	break;
869		1068
870	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)
871	{	1073	{
872	reset_connection ();	1074	reset_connection ("remote reset");
873		1075
874	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
875		1077
876	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
877	{
878	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
879	conf->nodename, (const char *)rsi);
880	connectmode = conf_node::C_DISABLED;
881	}
882	else if (connectmode == conf_node::C_ALWAYS)
883	establish_connection ();	1079	establish_connection ();
884	}	1080	}
		1081
885	break;	1082	break;
886		1083
887	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
888	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
889	{	1086	{
890	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
891		1088
892	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);
893		1092
894	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))
895	{	1099	{
896	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
897	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."),
898	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
899	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
900		1104
901	if (p->initiate)	1105	if (p->initiate)
		1106	{
902	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
903		1108
904	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
905		1112
		1113	auth_data auth;
		1114
906	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
907	{	1116	{
908	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1117	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
909	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
910	break;
911	}	1119	}
912	else	1120	else
913	{	1121	{
914	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
915		1123
916	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
917	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
918		1126
		1127	send_auth_response (rsi);
		1128
		1129	if (chg)
		1130	{
919	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
		1132	features = p->features & config_packet::get_features ();
920		1133
921	send_auth_response (rsi, p->id, k);
922
923	connection_established ();	1134	connection_established (rsi);
924
925	break;	1135	}
926	}	1136	}
		1137
		1138	break;
927	}	1139	}
928	else
929	slog (L_WARN, _("%s(%s): protocol mismatch"),
930	conf->nodename, (const char *)rsi);
931		1140
932	send_reset (rsi);	1141	send_reset (rsi);
933	}	1142	}
934		1143
935	break;	1144	break;
936		1145
937	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
938	{	1147	{
939	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
940		1149
941	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
942		1151
943	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))
944	{	1156	{
945	if (p->prot_minor != PROTOCOL_MINOR)
946	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
947	conf->nodename, (const char *)rsi,
948	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
949
950	rsachallenge chg;
951
952	if (!rsa_cache.find (p->id, chg))
953	{
954	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
955	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
956	break;
957	}	1159	}
958	else	1160	else if (!have_snd_auth)
959	{	1161	{
960	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
961		1163
962	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
963	{
964	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
965	"could be an attack, or just corruption or a synchronization error"),
966	conf->nodename, (const char *)rsi);
967	break;
968	}
969	else
970	{
971	rsaresponse h;
972
973	rsa_hash (p->id, chg, h);
974
975	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
976	{
977	prot_minor = p->prot_minor;
978
979	delete ictx; ictx = cctx;
980
981	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
982
983	si = rsi;
984	protocol = rsi.prot;
985
986	connection_established ();	1165	connection_established (rsi);
987
988	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
989	conf->nodename, (const char *)rsi,
990	p->prot_major, p->prot_minor);
991
992	if (::conf.script_node_up)
993	run_script (run_script_cb (this, &connection::script_node_up), false);
994
995	break;
996	}
997	else
998	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
999	conf->nodename, (const char *)rsi);
1000	}
1001
1002	delete cctx;
1003	}
1004	}	1166	}
1005	}	1167	}
1006
1007	send_reset (rsi);
1008	break;	1168	break;
1009		1169
1010	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1011	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1012	send_reset (rsi);	1172	send_reset (rsi);
…		…
1018	if (ictx && octx)	1178	if (ictx && octx)
1019	{	1179	{
1020	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1021		1181
1022	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	{
1023	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"
1024	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1025	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1026	else	1203	else
1027	{	1204	{
1028	u32 seqno;	1205	u32 seqno;
1029	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1030		1208
1031	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1032	{	1212	{
1033	vpn->tap->send (d);	1213	vpn->tap->send (d);
1034		1214
1035	if (si != rsi)	1215	if (si != rsi)
1036	{	1216	{
1037	// 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.)
1038	si = rsi;	1219	// {
1039
1040	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1041	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);
1042	}	1236	}
1043
1044	delete d;
1045
1046	break;
1047	}	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;
1048	}	1253	}
1049	}	1254	}
1050		1255
1051	send_reset (rsi);	1256	send_reset (rsi);
1052	break;	1257	break;
1053		1258
1054	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1055	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1056	{	1261	{
1057	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1058		1263
1059	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 ())
1060	connection *c = vpn->conns[p->id - 1];
1061	conf->protocols = p->protocols;
1062
1063	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1064	conf->id, p->id, c->ictx && c->octx);
1065
1066	if (c->ictx && c->octx)
1067	{	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	{
1068	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1069	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1070	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1071	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 ();
1072	}	1283	}
1073	else	1284	else
1074	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1075	}	1288	}
1076		1289
1077	break;	1290	break;
1078		1291
1079	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1080	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1081	{	1294	{
1082	connect_info_packet *p = (connect_info_packet *) pkt;	1295	connect_info_packet *p = (connect_info_packet *)pkt;
1083		1296
1084	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 ())
1085		1298	{
1086	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1087		1300
1088	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1089	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));
1090	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1091		1304
1092	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]",
1093	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);
1094		1313
1095	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1096		1315
1097	if (dsi.valid ())	1316	if (dsi.valid ())
1098	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);
1099	}	1327	}
1100		1328
1101	break;	1329	break;
1102		1330
1103	default:	1331	default:
1104	send_reset (rsi);	1332	send_reset (rsi);
1105	break;	1333	break;
1106	}	1334	}
1107	}	1335	}
1108		1336
1109	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1110	{	1339	{
1111	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)
1112	{	1345	{
1113	reset_connection ();	1346	reset_connection ("keepalive overdue");
1114	establish_connection ();	1347	establish_connection ();
1115	}	1348	}
1116	else if (NOW < last_activity + ::conf.keepalive)
1117	w.start (last_activity + ::conf.keepalive);
1118	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1119	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1120	{	1351	{
		1352	w.start (3);
1121	send_ping (si);	1353	send_ping (si);
1122	w.start (NOW + 5);
1123	}	1354	}
1124	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1125	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1126	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1127	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1128	else	1359	else
1129	reset_connection ();	1360	reset_connection ("keepalive timeout");
1130	}	1361	}
1131		1362
		1363	void
1132	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1133	{	1365	{
1134	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);
1135		1367
1136	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);
1137	p->hmac_set (octx);	1371	p->hmac_set (octx);
1138	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1139		1373
1140	delete p;	1374	delete p;
1141	}	1375	}
1142		1376
1143	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1144	{	1379	{
1145	vpn->script_if_up ();
1146
1147	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;
1148	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);
1149	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1150	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1151	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1152	}	1399	}
1153		1400
		1401	inline const char *
1154	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1155	{	1403	{
1156	script_node ();	1404	script_init_connect_env ();
1157		1405
1158	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1159		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1160	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1161	}
1162		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 *
1163	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1164	{	1435	{
1165	script_node ();	1436	script_init_connect_env ();
1166		1437
1167	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1168		1439
1169	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
1170	}	1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1171		1445
		1446	return filename;
		1447	}
		1448
1172	connection::connection(struct vpn *vpn_)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1173	: vpn(vpn_)	1450	: vpn(vpn), conf(conf),
1174	, rekey (this, &connection::rekey_cb)	1451	#if ENABLE_DNS
1175	, 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);
1176	, establish_connection (this, &connection::establish_connection_cb)	1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1177	{	1460
		1461	last_establish_attempt = 0.;
1178	octx = ictx = 0;	1462	octx = ictx = 0;
1179	retry_cnt = 0;
1180		1463
1181	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
1182	reset_connection ();	1470	reset_connection ("startup");
1183	}	1471	}
1184		1472
1185	connection::~connection ()	1473	connection::~connection ()
1186	{	1474	{
1187	shutdown ();	1475	shutdown ();
1188	}	1476	}
1189		1477
		1478	void
1190	void connection_init ()	1479	connection_init ()
1191	{	1480	{
1192	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1193	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1194	}	1483	}
1195		1484

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