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Comparing gvpe/src/connection.C (file contents):
Revision 1.34 by pcg, Mon May 10 18:57:07 2004 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) 2003-2004 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	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
30		43
31	#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
32		50
33	#include "conf.h"	51	#include "conf.h"
34	#include "slog.h"	52	#include "slog.h"
35	#include "device.h"	53	#include "device.h"
36	#include "vpn.h"	54	#include "vpn.h"
37	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
38		57
39	#include "netcompat.h"	58	#include "netcompat.h"
40		59
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
46		61
47	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
48	#define HLOG 15	63	#define HLOG 15
49	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
52		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	//////////////////////////////////////////////////////////////////////////////
		111
53	struct crypto_ctx	112	struct crypto_ctx
54	{	113	{
55	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	115	HMAC_CTX hctx;
57		116
58	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);
59	~crypto_ctx ();	118	~crypto_ctx ();
60	};	119	};
61		120
62	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)
63	{	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
64	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	153	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	154	}
69		155
70	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
71	{	157	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
74	}	160	}
75		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
76	static void	189	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	191	{
79	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	196	}
88		197
89	struct rsa_entry {	198	void
90	tstamp expire;	199	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	200	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		206
139	} rsa_cache;	207	// eventual response data
140		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	209	}
145	w.start (NOW + RSA_TTL);
146		210
147	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
148	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	213	}
154		214
155	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
156		216
157	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)
158	{	219	{
159	if (queue[i])	220	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		221
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	222	i = 0;
187	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	226	}
189		227
190	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
191	{	229	{
192	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
193	delete queue[i];	233	delete [] queue;
194	}	234	}
195		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
196	struct net_rateinfo {	292	struct net_rateinfo
		293	{
197	u32 host;	294	u32 host;
198	double pcnt, diff;	295	double pcnt, diff;
199	tstamp last;	296	tstamp last;
200	};	297	};
201		298
202	// 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.
203	// this implementation ("splay list" ;) is inefficient,	300	// this implementation ("splay list" ;) is inefficient,
204	// but low on resources.	301	// but low on resources.
205	struct net_rate_limiter : list<net_rateinfo>	302	struct net_rate_limiter : list<net_rateinfo>
206	{	303	{
207	# define NRL_ALPHA 1. - 1. / 600. // allow bursts	304	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
208	# define NRL_CUTOFF 10. // one event every CUTOFF seconds	305	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
209	# define NRL_EXPIRE NRL_CUTOFF * 30. // expire entries after this time	306	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
210	# define NRL_MAXDIF NRL_CUTOFF * (1. / (1. - NRL_ALPHA)) // maximum diff /count value	307	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
211		308
212	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	310	bool can (u32 host);
214	};	311	};
215		312
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		314
		315	bool
218	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
219	{	317	{
220	iterator i;	318	iterator i;
221		319
222	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
223	if (i->host == host)	321	if (i->host == host)
224	break;	322	break;
225	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	324	i = erase (i);
227	else	325	else
228	i++;	326	i++;
229		327
230	if (i == end ())	328	if (i == end ())
…		…
232	net_rateinfo ri;	330	net_rateinfo ri;
233		331
234	ri.host = host;	332	ri.host = host;
235	ri.pcnt = 1.;	333	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	335	ri.last = ev_now ();
238		336
239	push_front (ri);	337	push_front (ri);
240		338
241	return true;	339	return true;
242	}	340	}
…		…
244	{	342	{
245	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
246	erase (i);	344	erase (i);
247		345
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		348
251	ri.last = NOW;	349	ri.last = ev_now ();
252		350
253	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
254		352
255	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
256		354
…		…
268	}	366	}
269	}	367	}
270		368
271	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
272		370
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	373	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
280		375
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	379	}
286		380
287	void	381	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	383	{
290	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		385	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	387	}
294		388
295	bool	389	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	391	{
298	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		393	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	395	}
302		396
		397	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	399	{
305	type = type_;	400	type = type_;
306		401
307	int src = THISNODE->id;	402	int src = THISNODE->id;
308		403
…		…
313		408
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		411
317	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
318	{	421	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	423	}
		424	};
330		425
331	void	426	void
332	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)
333	{	428	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
337		432
338	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
340		435
341	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
342	{	437	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		439
345	if (cl)	440	if (cl)
346	{	441	{
…		…
352	d[1] = cl;	447	d[1] = cl;
353	}	448	}
354	}	449	}
355	#endif	450	#endif
356		451
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		453
359	struct {	454	struct {
360	#if RAND_SIZE	455	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
362	#endif	457	#endif
363	u32 seqno;	458	u32 seqno;
364	} datahdr;	459	} datahdr;
365		460
366	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	462	#if RAND_SIZE
368	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);
369	#endif	466	#endif
370		467
371	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	492	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
397	u8 *d;	494	u8 *d;
398	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
399		496
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		498
402	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
404		501
405	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	503	d = cdata;
407	else	504	else
408	#endif	505	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
410		507
411	/* 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
412	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	516	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	518	outl += outl2;
416		519
…		…
447	}	550	}
448	};	551	};
449		552
450	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
451	{	554	{
452	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
458		559
459	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
460	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		562
462	static u8 get_features ()	563	static u8 get_features ()
463	{	564	{
464	u8 f = 0;	565	u8 f = 0;
465	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
466	f |= FEATURE_COMPRESSION;	567	f |= FEATURE_COMPRESSION;
467	#endif	568	#endif
468	#if ENABLE_ROHC	569	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	570	f |= FEATURE_ROHC;
470	#endif	571	#endif
		572	#if ENABLE_BRIDGING
		573	f |= FEATURE_BRIDGING;
		574	#endif
471	return f;	575	return f;
472	}	576	}
473	};	577	};
474		578
		579	void
475	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
476	{	581	{
477	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	585	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	586	features = get_features ();
484		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	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 ()));
488		593
489	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	595	set_hdr (type, dst);
491	}	596	}
492		597
493	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	600	{
495	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
496	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);
497	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
498	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)"),
499	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	#if 0 // this implementation should handle all flag settings
502	else if (flags != curflags ())
503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504	#endif
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	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)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	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 ()));
513	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)
514	return true;	624	return true;
		625	}
515		626
516	return false;	627	return false;
517	}	628	}
518		629
519	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
520	{	631	{
521	char magic[8];	632	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	635	u8 pad2, pad3;
525	rsaid id;	636	auth_encr encr;
526	rsaencrdata encr;
527		637
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	639	{
530	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	642	initiate = !!initiate_;
533	protocols = protocols_;	643	protocols = protocols_;
534		644
535	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
536	}	646	}
537	};	647	};
538		648
539	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	650	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	651	auth_response response;
545		652
546	auth_res_packet (int dst)	653	auth_res_packet (int dst)
547	{	654	{
548	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
549		656
550	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
551	}	658	}
552	};	659	};
553		660
…		…
583	};	690	};
584		691
585	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
586		693
587	void	694	void
588	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
589	{	696	{
590	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."));
591	{	713	}
592	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);
593		717
594	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
595	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
596		730
597	// send queued packets	731	// send queued packets
598	if (ictx && octx)
599	{
600	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
601	{	733	{
602	send_data_packet (p);	734	if (p->len) send_data_packet (p);
603	delete p;	735	delete p;
604	}	736	}
605		737
606	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
607	{	739	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;	741	delete p;
610	}
611	}
612	}	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 ());
613	else	752	else
614	{	753	{
615	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
616	establish_connection.start (NOW + 5);	755	protocol = 0;
617	keepalive.stop ();
618	rekey.stop ();
619	}	756	}
620	}
621
622	void
623	connection::reset_si ()
624	{
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);
626
627	// mask out protocols we cannot establish
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
630		757
631	si.set (conf, protocol);	758	si.set (conf, protocol);
632	}	759	}
633		760
634	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
635	const sockinfo &	762	const sockinfo &
636	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
637	{	764	{
638	if (!si.valid ())	765	if (!si.valid ())
639	{	766	{
640	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
641		768
642	if (r)	769	if (r)
643	{	770	{
644	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
645	conf->nodename, r->conf->nodename);	772	conf->nodename, r->conf->nodename);
646	return r->si;	773	return r->si;
647	}	774	}
648	else	775	else
649	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
650	conf->nodename);	777	conf->nodename);
651	}	778	}
652		779
653	return si;	780	return si;
654	}	781	}
655		782
656	void	783	void
657	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)
658	{	785	{
659	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
660	reset_connection ();	787	reset_connection ("packet send error");
661	}	788	}
662		789
663	void	790	void
664	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
665	{	792	{
666	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
667		794
668	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);
669	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
670		799
671	delete pkt;	800	delete pkt;
672	}	801	}
673		802
…		…
688	void	817	void
689	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
690	{	819	{
691	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);
692		821
693	rsachallenge chg;	822	generate_auth_data ();
694	rsa_cache.gen (pkt->id, chg);
695	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
696		824
697	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);
698
699	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
700		827
701	delete pkt;	828	delete pkt;
702	}	829	}
703		830
704	void	831	void
705	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
706	{	833	{
707	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
708		835
709	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);
710		838
711	rsa_hash (id, chg, pkt->response);
712
713	pkt->hmac_set (octx);
714
715	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);
716
717	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
718		841
719	delete pkt;	842	delete pkt;
720	}	843	}
721		844
722	void	845	void
723	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
724	{	847	{
725	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
726	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
727		851
728	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);
729		853
730	r->hmac_set (octx);	854	r->hmac_set (octx);
731	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
732		856
733	delete r;	857	delete r;
734	}	858	}
735		859
736	void	860	inline void
737	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
738	{	862	{
739	if (!ictx	863	if (!(ictx && octx)
740	&& conf != THISNODE	864	&& conf != THISNODE
741	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
742	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
743	&& NOW > w.at)	867	&& !w.is_active ())
744	{	868	{
745	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
746		870	// and stop trying. should probably be handled by a per-connection expire handler.
747	if (retry_int < 3600 * 8)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
748	retry_cnt++;	874	return;
		875	}
749		876
750	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));
751		882
752	reset_si ();	883	reset_si ();
753		884
754	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);
755	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
756	else	893	else
757	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
758	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow || (dsi.prot & PROT_SLOW);
759		902
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
761	{	904	{
762	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))
763	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
764	else	910	else
765	send_ping (dsi, 0);	911	send_ping (dsi, 0);
766	}	912	}
767	}	913	}
768	}
769	}
770		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
771	void	926	void
772	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
773	{	928	{
774	if (ictx && octx)	929	if (ictx && octx)
775	{	930	{
776	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
777	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
778		933
779	if (::conf.script_node_down)	934	if (::conf.script_node_down)
780	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	}
781	}	940	}
782		941
783	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
784	delete octx; octx = 0;	943	delete octx; octx = 0;
785		944
786	si.host= 0;	945	si.host = 0;
787		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
788	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
789	retry_cnt = 0;	953	retry_cnt = 0;
790		954
791	rekey.stop ();	955	rekey.stop ();
792	keepalive.stop ();	956	keepalive.stop ();
793	establish_connection.stop ();	957	establish_connection.stop ();
…		…
797	connection::shutdown ()	961	connection::shutdown ()
798	{	962	{
799	if (ictx && octx)	963	if (ictx && octx)
800	send_reset (si);	964	send_reset (si);
801		965
802	reset_connection ();	966	reset_connection ("shutdown");
803	}	967	}
804		968
805	void	969	// poor-man's rekeying
806	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
807	{	972	{
808	reset_connection ();	973	reset_connection ("rekeying");
809	establish_connection ();	974	establish_connection ();
810	}	975	}
811		976
812	void	977	void
813	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
827	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
828	rekey ();	993	rekey ();
829	}	994	}
830		995
831	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
832	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
833	{	1008	{
834	if (ictx && octx)	1009	if (ictx && octx)
835	send_data_packet (pkt);	1010	send_data_packet (pkt);
836	else	1011	else
837	{	1012	{
838	if (!broadcast)//DDDD
839	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
840		1014	post_inject_queue ();
841	establish_connection ();
842	}	1015	}
843	}	1016	}
844		1017
		1018	void
845	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
846	{	1020	{
847	if (ictx && octx)	1021	if (ictx && octx)
848	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
849	else	1023	else
850	{	1024	{
851	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
852		1026	post_inject_queue ();
853	establish_connection ();
854	}	1027	}
855	}	1028	}
856		1029
857	void	1030	void
858	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
859	{	1032	{
860	last_activity = NOW;	1033	last_activity = ev_now ();
861		1034
862	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.",
863	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;
864		1040
865	switch (pkt->typ ())	1041	switch (pkt->typ ())
866	{	1042	{
867	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
868	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
869	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
870	// when we receive a ping.	1048	// when we receive a ping.
871	if (!ictx)	1049	if (!ictx)
872	{	1050	{
873	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
874	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
875	}	1053	}
876	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.
877	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
878		1058
879	break;	1059	break;
880		1060
881	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 ();
882	break;	1067	break;
883		1068
884	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)
885	{	1073	{
886	reset_connection ();	1074	reset_connection ("remote reset");
887		1075
888	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
889		1077
890	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
891	{
892	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
893	conf->nodename, (const char *)rsi);
894	connectmode = conf_node::C_DISABLED;
895	}
896	else if (connectmode == conf_node::C_ALWAYS)
897	establish_connection ();	1079	establish_connection ();
898	}	1080	}
		1081
899	break;	1082	break;
900		1083
901	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
902	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
903	{	1086	{
904	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
905		1088
906	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);
907		1092
908	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))
909	{	1099	{
910	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
911	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."),
912	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
913	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
914		1104
915	if (p->initiate)	1105	if (p->initiate)
		1106	{
916	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
917		1108
918	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
919		1112
		1113	auth_data auth;
		1114
920	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
921	{	1116	{
922	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?"),
923	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));
924	break;
925	}	1119	}
926	else	1120	else
927	{	1121	{
928	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
929		1123
930	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
931	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
932		1126
933	// compatibility code, remove when no longer required	1127	send_auth_response (rsi);
934	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
935		1128
		1129	if (chg)
		1130	{
936	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
937	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
938		1133
939	send_auth_response (rsi, p->id, k);
940
941	connection_established ();	1134	connection_established (rsi);
942
943	break;	1135	}
944	}	1136	}
		1137
		1138	break;
945	}	1139	}
946	else
947	slog (L_WARN, _("%s(%s): protocol mismatch"),
948	conf->nodename, (const char *)rsi);
949		1140
950	send_reset (rsi);	1141	send_reset (rsi);
951	}	1142	}
952		1143
953	break;	1144	break;
954		1145
955	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
956	{	1147	{
957	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
958		1149
959	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
960		1151
961	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))
962	{	1156	{
963	if (p->prot_minor != PROTOCOL_MINOR)
964	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
965	conf->nodename, (const char *)rsi,
966	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
967
968	rsachallenge chg;
969
970	if (!rsa_cache.find (p->id, chg))
971	{
972	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
973	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
974	break;
975	}	1159	}
976	else	1160	else if (!have_snd_auth)
977	{	1161	{
978	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
979		1163
980	if (!p->hmac_chk (cctx))	1164	have_snd_auth = true;
981	{
982	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
983	"could be an attack, or just corruption or a synchronization error"),
984	conf->nodename, (const char *)rsi);
985	break;
986	}
987	else
988	{
989	rsaresponse h;
990
991	rsa_hash (p->id, chg, h);
992
993	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
994	{
995	prot_minor = p->prot_minor;
996
997	delete ictx; ictx = cctx;
998
999	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1000
1001	si = rsi;
1002	protocol = rsi.prot;
1003
1004	connection_established ();	1165	connection_established (rsi);
1005
1006	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1007	conf->nodename, (const char *)rsi,
1008	p->prot_major, p->prot_minor);
1009
1010	if (::conf.script_node_up)
1011	run_script (run_script_cb (this, &connection::script_node_up), false);
1012
1013	break;
1014	}
1015	else
1016	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1017	conf->nodename, (const char *)rsi);
1018	}
1019
1020	delete cctx;
1021	}
1022	}	1166	}
1023	}	1167	}
1024
1025	send_reset (rsi);
1026	break;	1168	break;
1027		1169
1028	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1029	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1030	send_reset (rsi);	1172	send_reset (rsi);
…		…
1036	if (ictx && octx)	1178	if (ictx && octx)
1037	{	1179	{
1038	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1039		1181
1040	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	{
1041	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"
1042	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1043	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1044	else	1203	else
1045	{	1204	{
1046	u32 seqno;	1205	u32 seqno;
1047	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1048		1208
1049	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1050	{	1212	{
1051	vpn->tap->send (d);	1213	vpn->tap->send (d);
1052		1214
1053	if (si != rsi)	1215	if (si != rsi)
1054	{	1216	{
1055	// 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.)
1056	si = rsi;	1219	// {
1057
1058	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1059	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);
1060	}	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);
1061	}	1249	}
1062		1250
1063	delete d;	1251	delete d;
1064	break;	1252	break;
1065	}	1253	}
…		…
1069	break;	1257	break;
1070		1258
1071	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1072	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1073	{	1261	{
1074	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1075		1263
1076	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 ())
1077	connection *c = vpn->conns[p->id - 1];
1078	conf->protocols = p->protocols;
1079
1080	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1081	conf->id, p->id, c->ictx && c->octx);
1082
1083	if (c->ictx && c->octx)
1084	{	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	{
1085	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1086	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1087	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1088	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 ();
1089	}	1283	}
1090	else	1284	else
1091	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1092	}	1288	}
1093		1289
1094	break;	1290	break;
1095		1291
1096	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1097	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1098	{	1294	{
1099	connect_info_packet *p = (connect_info_packet *) pkt;	1295	connect_info_packet *p = (connect_info_packet *)pkt;
1100		1296
1101	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 ())
1102		1298	{
1103	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1104		1300
1105	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1106	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));
1107	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1108		1304
1109	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]",
1110	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);
1111		1313
1112	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1113		1315
1114	if (dsi.valid ())	1316	if (dsi.valid ())
1115	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);
1116	}	1327	}
1117		1328
1118	break;	1329	break;
1119		1330
1120	default:	1331	default:
1121	send_reset (rsi);	1332	send_reset (rsi);
1122	break;	1333	break;
1123	}	1334	}
1124	}	1335	}
1125		1336
1126	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1127	{	1339	{
1128	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)
1129	{	1345	{
1130	reset_connection ();	1346	reset_connection ("keepalive overdue");
1131	establish_connection ();	1347	establish_connection ();
1132	}	1348	}
1133	else if (NOW < last_activity + ::conf.keepalive)
1134	w.start (last_activity + ::conf.keepalive);
1135	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1136	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1137	{	1351	{
		1352	w.start (3);
1138	send_ping (si);	1353	send_ping (si);
1139	w.start (NOW + 5);
1140	}	1354	}
1141	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1142	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1143	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1144	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1145	else	1359	else
1146	reset_connection ();	1360	reset_connection ("keepalive timeout");
1147	}	1361	}
1148		1362
		1363	void
1149	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1150	{	1365	{
1151	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);
1152		1367
1153	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);
1154	p->hmac_set (octx);	1371	p->hmac_set (octx);
1155	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1156		1373
1157	delete p;	1374	delete p;
1158	}	1375	}
1159		1376
1160	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1161	{	1379	{
1162	vpn->script_if_up ();
1163
1164	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;
1165	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);
1166	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1167	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1168	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1169	}	1399	}
1170		1400
		1401	inline const char *
1171	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1172	{	1403	{
1173	script_node ();	1404	script_init_connect_env ();
1174		1405
1175	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1176		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1177	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1178	}
1179		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 *
1180	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1181	{	1435	{
1182	script_node ();	1436	script_init_connect_env ();
1183		1437
1184	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1185		1439
1186	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
1187	}	1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1188		1445
		1446	return filename;
		1447	}
		1448
1189	connection::connection(struct vpn *vpn_)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1190	: vpn(vpn_)	1450	: vpn(vpn), conf(conf),
1191	, rekey (this, &connection::rekey_cb)	1451	#if ENABLE_DNS
1192	, 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);
1193	, establish_connection (this, &connection::establish_connection_cb)	1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1194	{	1460
		1461	last_establish_attempt = 0.;
1195	octx = ictx = 0;	1462	octx = ictx = 0;
1196	retry_cnt = 0;
1197		1463
1198	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
1199	reset_connection ();	1470	reset_connection ("startup");
1200	}	1471	}
1201		1472
1202	connection::~connection ()	1473	connection::~connection ()
1203	{	1474	{
1204	shutdown ();	1475	shutdown ();
1205	}	1476	}
1206		1477
		1478	void
1207	void connection_init ()	1479	connection_init ()
1208	{	1480	{
1209	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1210	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1211	}	1483	}
1212		1484

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