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Comparing gvpe/src/connection.C (file contents):
Revision 1.4 by pcg, Wed Apr 2 21:02:25 2003 UTC vs.
Revision 1.112 by root, Fri Sep 12 10:40:43 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) require (exp)
		49	#endif
33		50
34	#include "conf.h"	51	#include "conf.h"
35	#include "slog.h"	52	#include "slog.h"
36	#include "device.h"	53	#include "device.h"
37	#include "vpn.h"	54	#include "vpn.h"
38	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
39		57
40	#if !HAVE_RAND_PSEUDO_BYTES	58	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		59
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61
		62	#define ULTRA_FAST 1
		63	#define HLOG 15
		64	#include "lzf/lzf.h"
		65	#include "lzf/lzf_c.c"
		66	#include "lzf/lzf_d.c"
		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb *cb, const char *warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
45		111
46	struct crypto_ctx	112	struct crypto_ctx
47	{	113	{
48	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	115	HMAC_CTX hctx;
50		116
51	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	118	~crypto_ctx ();
53	};	119	};
54		120
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
57	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	153	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	154	}
62		155
63	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
64	{	157	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
67	}	160	}
68		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
69	static void	189	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	191	{
72	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	196	}
81		197
82	struct rsa_entry {	198	void
83	tstamp expire;	199	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	200	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		206
132	} rsa_cache;	207	// eventual response data
133		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	209	}
140	w.at = NOW + RSA_TTL;
141		210
142	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
143	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	213	}
149		214
150	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
151		216
152	void pkt_queue::put (tap_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	tap_packet *pkt_queue::get ()
166	{
167	tap_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. / 90.; // allow bursts	304	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // 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
		307	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		308
206	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	310	bool can (u32 host);
208	};	311	};
209		312
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		314
		315	bool
212	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
213	{	317	{
214	iterator i;	318	iterator i;
215		319
216	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
217	if (i->host == host)	321	if (i->host == host)
218	break;	322	break;
219	else if (i->last < NOW - EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	324	i = erase (i);
221	else	325	else
222	i++;	326	i++;
223		327
224	if (i == end ())	328	if (i == end ())
225	{	329	{
226	net_rateinfo ri;	330	net_rateinfo ri;
227		331
228	ri.host = host;	332	ri.host = host;
229	ri.pcnt = 1.;	333	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	334	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	335	ri.last = ev_now ();
232		336
233	push_front (ri);	337	push_front (ri);
234		338
235	return true;	339	return true;
236	}	340	}
237	else	341	else
238	{	342	{
239	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
240	erase (i);	344	erase (i);
241		345
242	ri.pcnt = ri.pcnt * ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		348
245	ri.last = NOW;	349	ri.last = ev_now ();
246		350
		351	double dif = ri.diff / ri.pcnt;
		352
247	bool send = ri.diff / ri.pcnt > CUTOFF;	353	bool send = dif > NRL_CUTOFF;
248		354
		355	if (dif > NRL_MAXDIF)
		356	{
		357	ri.pcnt = 1.;
		358	ri.diff = NRL_MAXDIF;
		359	}
249	if (send)	360	else if (send)
250	ri.pcnt++;	361	ri.pcnt++;
251		362
252	push_front (ri);	363	push_front (ri);
253		364
254	return send;	365	return send;
255	}	366	}
256	}	367	}
257		368
258	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
259		370
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
261
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
263	{	373	{
264	unsigned int xlen;
265
266	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
267		375
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
270	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
272	}	379	}
273		380
274	void	381	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	383	{
277	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
278		385	hmac_gen (ctx, hmac_digest);
279	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
280	}	387	}
281		388
282	bool	389	bool
283	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
284	{	391	{
285	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		393	hmac_gen (ctx, hmac_digest);
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
288	}	395	}
289		396
		397	void
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	399	{
292	this->type = type;	400	type = type_;
293		401
294	int src = THISNODE->id;	402	int src = THISNODE->id;
295		403
296	src1 = src;	404	src1 = src;
297	srcdst = ((src >> 8) << 4) | (dst >> 8);	405	srcdst = ((src >> 8) << 4) | (dst >> 8);
…		…
299	}	407	}
300		408
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		411
304	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
305	{	421	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307
308	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
309	tap_packet *unpack (connection *conn, u32 &seqno);
310	private:
311
312	const u32 data_hdr_size () const
313	{
314	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	423	}
		424	};
317		425
318	void	426	void
319	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)
320	{	428	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	430	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
324		432
325	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
327	u32 cl;
328		435
		436	if (conn->features & FEATURE_COMPRESSION)
		437	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		439
330	if (cl)	440	if (cl)
331	{	441	{
332	type = PT_DATA_COMPRESSED;	442	type = PT_DATA_COMPRESSED;
333	d = cdata;	443	d = cdata;
334	l = cl + 2;	444	l = cl + 2;
335		445
336	d[0] = cl >> 8;	446	d[0] = cl >> 8;
337	d[1] = cl;	447	d[1] = cl;
		448	}
338	}	449	}
339	#endif	450	#endif
340		451
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		453
343	struct {	454	struct {
344	#if RAND_SIZE	455	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
346	#endif	457	#endif
347	u32 seqno;	458	u32 seqno;
348	} datahdr;	459	} datahdr;
349		460
350	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	462	#if RAND_SIZE
352	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);
353	#endif	466	#endif
354		467
355	EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	470	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	471	outl += outl2;
359		472
360	EVP_EncryptUpdate (cctx,	473	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	474	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	475	(unsigned char *) d, l));
363	outl += outl2;	476	outl += outl2;
364		477
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	478	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	479	outl += outl2;
367		480
368	len = outl + data_hdr_size ();	481	len = outl + data_hdr_size ();
369		482
370	set_hdr (type, dst);	483	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	492	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
381	u8 *d;	494	u8 *d;
382	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
383		496
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		498
386	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
388		501
389	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	503	d = cdata;
391	else	504	else
392	#endif	505	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
394		507
395	/* 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
396	EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	516	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	517	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	518	outl += outl2;
400		519
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	520	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	521	outl += outl2;
403		522
404	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	523	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
405		524
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	525	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	550	}
432	};	551	};
433		552
434	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
435	{	554	{
436	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
437	// field comes before this data, so peers with other
438	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	557	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
442		559
443	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 ()
444	{	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
445	return 0x80	575	return f;
446	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}	576	}
448
449	void setup (ptype type, int dst);
450	bool chk_config () const;
451	};	577	};
452		578
		579	void
453	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
454	{	581	{
455	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	585	flags = 0;
459	flags = curflags ();	586	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	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 ()));
465		593
466	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	595	set_hdr (type, dst);
468	}	596	}
469		597
470	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
471	{	600	{
472	return prot_major == PROTOCOL_MAJOR	601	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
474	&& hmaclen == HMACLENGTH	603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
475	&& flags == curflags ()	604	else if (randsize != RAND_SIZE)
476	&& challengelen == sizeof (rsachallenge)	605	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	608	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
480	}	610	else if (mac_nid != htonl (EVP_MD_type (MAC_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 ()));
		616	else
		617	{
		618	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
481		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)
		624	return true;
		625	}
		626
		627	return false;
		628	}
		629
482	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
483	{	631	{
484	char magic[8];	632	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	635	u8 pad2, pad3;
488	rsaid id;	636	auth_encr encr;
489	rsaencrdata encr;
490		637
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	639	{
493	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	642	initiate = !!initiate_;
496	protocols = protocols_;	643	protocols = protocols_;
497		644
498	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
499	}	646	}
500	};	647	};
501		648
502	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
503	{	650	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	651	auth_response response;
508		652
509	auth_res_packet (int dst)	653	auth_res_packet (int dst)
510	{	654	{
511	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
512		656
513	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
514	}	658	}
515	};	659	};
516		660
…		…
546	};	690	};
547		691
548	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
549		693
550	void	694	void
		695	connection::connection_established (const sockinfo &rsi)
		696	{
		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."));
		713	}
		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);
		717
		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
		729	keepalive.start (::conf.keepalive);
		730
		731	// send queued packets
		732	while (tap_packet *p = (tap_packet *)data_queue.get ())
		733	{
		734	if (p->len) send_data_packet (p);
		735	delete p;
		736	}
		737
		738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		739	{
		740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		741	delete p;
		742	}
		743
		744	vpn->connection_established (this);
		745	}
		746
		747	void
551	connection::reset_dstaddr ()	748	connection::reset_si ()
552	{	749	{
		750	if (vpn->can_direct (THISNODE, conf))
		751	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
		752	else
		753	{
		754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
		755	protocol = 0;
		756	}
		757
553	si.set (conf);	758	si.set (conf, protocol);
		759	}
		760
		761	// ensure sockinfo is valid, forward if necessary
		762	const sockinfo &
		763	connection::forward_si (const sockinfo &si) const
		764	{
		765	if (!si.valid ())
		766	{
		767	connection *r = vpn->find_router_for (this);
		768
		769	if (r)
		770	{
		771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
		772	conf->nodename, r->conf->nodename);
		773	return r->si;
		774	}
		775	else
		776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		777	conf->nodename);
		778	}
		779
		780	return si;
		781	}
		782
		783	void
		784	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		785	{
		786	if (!vpn->send_vpn_packet (pkt, si, tos))
		787	reset_connection ("packet send error");
554	}	788	}
555		789
556	void	790	void
557	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
558	{	792	{
559	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
560		794
561	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);
562	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563		799
564	delete pkt;	800	delete pkt;
565	}	801	}
566		802
…		…
581	void	817	void
582	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
583	{	819	{
584	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);
585		821
586	protocol = best_protocol (THISNODE->protocols & conf->protocols);	822	generate_auth_data ();
		823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
587		824
588	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591
592	if (protocol)
593	{
594	rsachallenge chg;
595
596	rsa_cache.gen (pkt->id, chg);
597
598	if (0 > RSA_public_encrypt (sizeof chg,
599	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
601	fatal ("RSA_public_encrypt error");
602
603	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);
604
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	826	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
606		827
607	delete pkt;	828	delete pkt;
608	}
609	else
610	; // silently fail
611	}	829	}
612		830
613	void	831	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
615	{	833	{
616	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
617		835
618	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);
619		838
620	rsa_hash (id, chg, pkt->response);
621
622	pkt->hmac_set (octx);
623
624	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);
625
626	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
627		841
628	delete pkt;	842	delete pkt;
629	}	843	}
630		844
631	void	845	void
632	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
633	{	847	{
634	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
635	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
636		851
637	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);
638		853
639	r->hmac_set (octx);	854	r->hmac_set (octx);
640	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
641		856
642	delete r;	857	delete r;
643	}	858	}
644		859
645	void	860	inline void
646	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
647	{	862	{
648	if (ictx || conf == THISNODE	863	if (!(ictx && octx)
		864	&& conf != THISNODE
649	|| connectmode == conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
650	|| connectmode == conf_node::C_DISABLED)	866	&& connectmode != conf_node::C_DISABLED
651	w.at = TSTAMP_CANCEL;	867	&& !w.is_active ())
652	else if (w.at <= NOW)
653	{	868	{
654	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
655		870	// and stop trying. should probably be handled by a per-connection expire handler.
656	if (retry_int < 3600 * 8)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
657	retry_cnt++;
658
659	w.at = NOW + retry_int;
660
661	if (conf->hostname)
662	{	872	{
663	reset_dstaddr ();	873	reset_connection ("no demand");
664	if (si.host && auth_rate_limiter.can (si))	874	return;
665	{
666	if (retry_cnt < 4)
667	send_auth_request (si, true);
668	else
669	send_ping (si, 0);
670	}	875	}
		876
		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));
		882
		883	reset_si ();
		884
		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);
		891	vpn->send_connect_request (this);
671	}	892	}
672	else	893	else
673	vpn->connect_request (conf->id);	894	{
674	}	895	if (si.valid ())
675	}	896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
676		898
		899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow || (dsi.prot & PROT_SLOW);
		902
		903	if (dsi.valid () && auth_rate_limiter.can (dsi))
		904	{
		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))
		909	send_auth_request (dsi, true);
		910	else
		911	send_ping (dsi, 0);
		912	}
		913	}
		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
677	void	926	void
678	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
679	{	928	{
680	if (ictx && octx)	929	if (ictx && octx)
681	{	930	{
682	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
683	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
684		933
685	if (::conf.script_node_down)	934	if (::conf.script_node_down)
686	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	}
687	}	940	}
688		941
689	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
690	delete octx; octx = 0;	943	delete octx; octx = 0;
691		944
692	si.host= 0;	945	si.host = 0;
693		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
694	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
695	retry_cnt = 0;	953	retry_cnt = 0;
696		954
697	rekey.reset ();	955	rekey.stop ();
698	keepalive.reset ();	956	keepalive.stop ();
699	establish_connection.reset ();	957	establish_connection.stop ();
700	}	958	}
701		959
702	void	960	void
703	connection::shutdown ()	961	connection::shutdown ()
704	{	962	{
705	if (ictx && octx)	963	if (ictx && octx)
706	send_reset (si);	964	send_reset (si);
707		965
708	reset_connection ();	966	reset_connection ("shutdown");
709	}	967	}
710		968
711	void	969	// poor-man's rekeying
712	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
713	{	972	{
714	w.at = TSTAMP_CANCEL;
715
716	reset_connection ();	973	reset_connection ("rekeying");
717	establish_connection ();	974	establish_connection ();
718	}	975	}
719		976
720	void	977	void
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	978	connection::send_data_packet (tap_packet *pkt)
722	{	979	{
723	vpndata_packet *p = new vpndata_packet;	980	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	981	int tos = 0;
725		982
726	if (conf->inherit_tos	983	// I am not hilarious about peeking into packets, but so be it.
727	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	984	if (conf->inherit_tos && pkt->is_ipv4 ())
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	985	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		986
731	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
732	send_vpn_packet (p, si, tos);	988	send_vpn_packet (p, si, tos);
733		989
734	delete p;	990	delete p;
735		991
736	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
737	rekey ();	993	rekey ();
738	}	994	}
739		995
740	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
741	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1007	connection::inject_data_packet (tap_packet *pkt)
742	{	1008	{
743	if (ictx && octx)	1009	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	1010	send_data_packet (pkt);
745	else	1011	else
746	{	1012	{
747	if (!broadcast)//DDDD
748	queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
		1014	post_inject_queue ();
		1015	}
		1016	}
749		1017
750	establish_connection ();	1018	void
		1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1020	{
		1021	if (ictx && octx)
		1022	send_vpn_packet (pkt, si, tos);
		1023	else
		1024	{
		1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1026	post_inject_queue ();
751	}	1027	}
752	}	1028	}
753		1029
754	void	1030	void
755	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
756	{	1032	{
757	last_activity = NOW;	1033	last_activity = ev_now ();
758		1034
759	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.",
760	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;
761		1040
762	switch (pkt->typ ())	1041	switch (pkt->typ ())
763	{	1042	{
764	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
765	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
766	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
767	// when we receive a ping.	1048	// when we receive a ping.
768	if (!ictx)	1049	if (!ictx)
769	{	1050	{
770	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
771	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
772	}	1053	}
773	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.
774	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
775		1058
776	break;	1059	break;
777		1060
778	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 ();
779	break;	1067	break;
780		1068
781	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)
782	{	1073	{
783	reset_connection ();	1074	reset_connection ("remote reset");
784		1075
785	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
786		1077
787	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
788	{
789	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
790	conf->nodename, (const char *)rsi);
791	connectmode = conf_node::C_DISABLED;
792	}
793	else if (connectmode == conf_node::C_ALWAYS)
794	establish_connection ();	1079	establish_connection ();
795	}	1080	}
		1081
796	break;	1082	break;
797		1083
798	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
799	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
800	{	1086	{
801	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
802		1088
803	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);
804		1092
805	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))
806	{	1099	{
807	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
808	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."),
809	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
810	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
811		1104
812	if (p->initiate)	1105	if (p->initiate)
		1106	{
813	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
814		1108
815	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
816		1112
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	1113	auth_data auth;
818	(unsigned char *)&p->encr, (unsigned char *)&k,	1114
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1116	{
820	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?"),
821	conf->nodename, (const char *)rsi);	1118	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1119	}
822	else	1120	else
823	{	1121	{
824	retry_cnt = 0;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
825	establish_connection.set (NOW + 8); //? ;)
826	keepalive.reset ();
827	rekey.reset ();
828		1123
829	delete ictx;
830	ictx = 0;	1124	rcv_auth = auth;
		1125	have_rcv_auth = true;
831		1126
832	delete octx;	1127	send_auth_response (rsi);
833		1128
834	octx = new crypto_ctx (k, 1);	1129	if (chg)
835	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1130	{
836
837	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
838	send_auth_response (rsi, p->id, k);	1132	features = p->features & config_packet::get_features ();
839		1133
		1134	connection_established (rsi);
840	break;	1135	}
841	}	1136	}
		1137
		1138	break;
842	}	1139	}
843		1140
844	send_reset (rsi);	1141	send_reset (rsi);
845	}	1142	}
846		1143
847	break;	1144	break;
848		1145
849	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
850	{	1147	{
851	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
852		1149
853	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
854		1151
855	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))
856	{	1156	{
857	if (p->prot_minor != PROTOCOL_MINOR)
858	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
859	conf->nodename, (const char *)rsi,
860	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861
862	rsachallenge chg;
863
864	if (!rsa_cache.find (p->id, chg))
865	slog (L_ERR, _("%s(%s): unrequested auth response"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
866	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
867	else
868	{
869	crypto_ctx *cctx = new crypto_ctx (chg, 0);
870
871	if (!p->hmac_chk (cctx))
872	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
873	"could be an attack, or just corruption or an synchronization error"),
874	conf->nodename, (const char *)rsi);
875	else
876	{
877	rsaresponse h;
878
879	rsa_hash (p->id, chg, h);
880
881	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
882	{
883	prot_minor = p->prot_minor;
884
885	delete ictx; ictx = cctx;
886
887	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888
889	si = rsi;
890
891	rekey.set (NOW + ::conf.rekey);
892	keepalive.set (NOW + ::conf.keepalive);
893
894	// send queued packets
895	while (tap_packet *p = queue.get ())
896	{
897	send_data_packet (p);
898	delete p;
899	}
900
901	connectmode = conf->connectmode;
902
903	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
904	conf->nodename, (const char *)rsi,
905	strprotocol (protocol),
906	p->prot_major, p->prot_minor);
907
908	if (::conf.script_node_up)
909	run_script (run_script_cb (this, &connection::script_node_up), false);
910
911	break;
912	}
913	else
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
915	conf->nodename, (const char *)rsi);
916	}
917
918	delete cctx;
919	}	1159	}
		1160	else if (!have_snd_auth)
		1161	{
		1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1163
		1164	have_snd_auth = true;
		1165	connection_established (rsi);
920	}	1166	}
921	}	1167	}
922
923	send_reset (rsi);
924	break;	1168	break;
925		1169
926	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
927	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
928	send_reset (rsi);	1172	send_reset (rsi);
…		…
933		1177
934	if (ictx && octx)	1178	if (ictx && octx)
935	{	1179	{
936	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
937		1181
938	if (rsi == si)	1182	if (!p->hmac_chk (ictx))
939	{	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
940	if (!p->hmac_chk (ictx))	1188	if (!hmac_error)
941	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1189	{
942	"could be an attack, or just corruption or an synchronization error"),	1190	hmac_error = ev_now () + 3;
943	conf->nodename, (const char *)rsi);	1191	break;
		1192	}
		1193	else if (hmac_error >= ev_now ())
		1194	break; // silently suppress
944	else	1195	else
945	{	1196	{
946	u32 seqno;	1197	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
947	tap_packet *d = p->unpack (this, seqno);	1198	"could be an attack, or just corruption or a synchronization error."),
948		1199	conf->nodename, (const char *)rsi);
949	if (iseqno.recv_ok (seqno))
950	{	1200	// reset
951	vpn->tap->send (d);
952
953	if (p->dst () == 0) // re-broadcast
954	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
955	{
956	connection *c = *i;
957
958	if (c->conf != THISNODE && c->conf != conf)
959	c->inject_data_packet (d);
960	}
961
962	delete d;
963
964	break;
965	}
966	}	1201	}
967	}	1202	}
968	else	1203	else
969	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);	1204	{
		1205	u32 seqno;
		1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
		1208
		1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
		1212	{
		1213	vpn->tap->send (d);
		1214
		1215	if (si != rsi)
		1216	{
		1217	// fast re-sync on source address changes, useful especially for tcp/ip
		1218	//if (last_si_change < ev_now () + 5.)
		1219	// {
		1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		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);
		1236	}
		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;
		1253	}
970	}	1254	}
971		1255
972	send_reset (rsi);	1256	send_reset (rsi);
973	break;	1257	break;
974		1258
975	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1261	{
978	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
979		1263
980	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 ())
981	conf->protocols = p->protocols;
982	connection *c = vpn->conns[p->id - 1];
983
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985	conf->id, p->id, c->ictx && c->octx);
986
987	if (c->ictx && c->octx)
988	{	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	{
989	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
992	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 ();
993	}	1283	}
		1284	else
		1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
994	}	1288	}
995		1289
996	break;	1290	break;
997		1291
998	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1294	{
1001	connect_info_packet *p = (connect_info_packet *) pkt;	1295	connect_info_packet *p = (connect_info_packet *)pkt;
1002		1296
1003	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 ())
1004	conf->protocols = p->protocols;	1298	{
1005	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1006		1300
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1301	c->conf->protocols = p->protocols;
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1302	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1303	p->si.upgrade_protocol (protocol, c->conf);
1009		1304
		1305	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		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);
		1313
		1314	const sockinfo &dsi = forward_si (p->si);
		1315
		1316	if (dsi.valid ())
1010	c->send_auth_request (p->si, 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);
1011	}	1327	}
1012		1328
1013	break;	1329	break;
1014		1330
1015	default:	1331	default:
1016	send_reset (rsi);	1332	send_reset (rsi);
1017	break;	1333	break;
1018	}	1334	}
1019	}	1335	}
1020		1336
1021	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1022	{	1339	{
1023	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)
1024	{	1345	{
1025	reset_connection ();	1346	reset_connection ("keepalive overdue");
1026	establish_connection ();	1347	establish_connection ();
1027	}	1348	}
1028	else if (NOW < last_activity + ::conf.keepalive)
1029	w.at = last_activity + ::conf.keepalive;
1030	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1031	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1032	{	1351	{
		1352	w.start (3);
1033	send_ping (si);	1353	send_ping (si);
1034	w.at = NOW + 5;
1035	}	1354	}
		1355	else if (when >= -10)
		1356	// hold ondemand connections implicitly a few seconds longer
		1357	// should delete octx, though, or something like that ;)
		1358	w.start (when + 10);
1036	else	1359	else
1037	reset_connection ();	1360	reset_connection ("keepalive timeout");
1038	}	1361	}
1039		1362
		1363	void
1040	void connection::connect_request (int id)	1364	connection::send_connect_request (int id)
1041	{	1365	{
1042	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);
1043		1367
1044	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);
1045	p->hmac_set (octx);	1371	p->hmac_set (octx);
1046	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1047		1373
1048	delete p;	1374	delete p;
1049	}	1375	}
1050		1376
1051	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1052	{	1379	{
1053	vpn->script_if_up ();
1054
1055	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;
1056	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);
1057	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1058	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1059	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1060	}	1399	}
1061		1400
		1401	inline const char *
1062	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1063	{	1403	{
1064	script_node ();	1404	script_init_connect_env ();
1065		1405
1066	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1067		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1068	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1069	}
1070		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 *
1071	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1072	{	1435	{
1073	script_node ();	1436	script_init_connect_env ();
1074		1437
1075	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1076		1439
1077	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
1078	}	1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1079		1445
1080	// send a vpn packet out to other hosts	1446	return filename;
1081	void
1082	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1083	{
1084	switch (protocol)
1085	{
1086	case PROT_IPv4:
1087	vpn->send_ipv4_packet (pkt, si, tos);
1088	break;
1089
1090	case PROT_UDPv4:
1091	vpn->send_udpv4_packet (pkt, si, tos);
1092	break;
1093
1094	case PROT_TCPv4:
1095	vpn->send_tcpv4_packet (pkt, si, tos);
1096	break;
1097	}
1098	}	1447	}
1099		1448
1100	connection::connection(struct vpn *vpn_)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1101	: vpn(vpn_)	1450	: vpn(vpn), conf(conf),
1102	, rekey (this, &connection::rekey_cb)	1451	#if ENABLE_DNS
1103	, 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);
1104	, establish_connection (this, &connection::establish_connection_cb)	1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1105	{	1460
		1461	last_establish_attempt = 0.;
1106	octx = ictx = 0;	1462	octx = ictx = 0;
1107	retry_cnt = 0;
1108		1463
1109	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
1110	reset_connection ();	1470	reset_connection ("startup");
1111	}	1471	}
1112		1472
1113	connection::~connection ()	1473	connection::~connection ()
1114	{	1474	{
1115	shutdown ();	1475	shutdown ();
1116	}	1476	}
1117		1477
		1478	void
1118	void connection_init ()	1479	connection_init ()
1119	{	1480	{
1120	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1121	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1122	}	1483	}
1123		1484

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