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Comparing gvpe/src/connection.C (file contents):
Revision 1.57 by pcg, Thu Jul 7 14:41:51 2005 UTC vs.
Revision 1.113 by root, Thu Jan 29 00:21:39 2015 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	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
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	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
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	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
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
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>
		43
		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
30		50
31	#include "conf.h"	51	#include "conf.h"
32	#include "slog.h"	52	#include "slog.h"
33	#include "device.h"	53	#include "device.h"
34	#include "vpn.h"	54	#include "vpn.h"
35	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
36		57
37	#include "netcompat.h"	58	#include "netcompat.h"
38		59
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
44		61
45	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
46	#define HLOG 15	63	#define HLOG 15
47	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
50		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
51	struct crypto_ctx	112	struct crypto_ctx
52	{	113	{
53	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	115	HMAC_CTX hctx;
55		116
56	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	118	~crypto_ctx ();
58	};	119	};
59		120
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
62	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
63	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));
64	HMAC_CTX_init (&hctx);	153	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	154	}
67		155
68	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
69	{	157	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
72	}	160	}
73		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
74	static void	189	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	191	{
77	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	196	}
86		197
87	struct rsa_entry {	198	void
88	tstamp expire;	199	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	200	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	202	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	203	// request data
102	{	204	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		206
105	erase (i);	207	// eventual response data
106	return true;	208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	209	}
109		210
110	if (cleaner.at < NOW)	211	// every use prolongs the expiry
111	cleaner.start (NOW + RSA_TTL);	212	auth_expire = ev_now () + AUTH_TTL;
112
113	return false;
114	}
115
116	void gen (rsaid &id, rsachallenge &chg)
117	{
118	rsa_entry e;
119
120	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122
123	e.expire = NOW + RSA_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (cleaner.at < NOW)
130	cleaner.start (NOW + RSA_TTL);
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{ }
136
137	} rsa_cache;
138
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{
143	w.start (NOW + RSA_TTL);
144
145	for (iterator i = begin (); i != end (); )
146	if (i->expire <= NOW)
147	i = erase (i);
148	else
149	++i;
150	}
151	}	213	}
152		214
153	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
154		216
155	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
156	{	219	{
157	if (queue[i])	220	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		221
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	222	i = 0;
185	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	226	}
187		227
188	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
189	{	229	{
190	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
191	delete queue[i];	233	delete [] queue;
192	}	234	}
193		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
		290	}
		291
194	struct net_rateinfo {	292	struct net_rateinfo
		293	{
195	u32 host;	294	u32 host;
196	double pcnt, diff;	295	double pcnt, diff;
197	tstamp last;	296	tstamp last;
198	};	297	};
199		298
…		…
209		308
210	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	310	bool can (u32 host);
212	};	311	};
213		312
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		314
		315	bool
216	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
217	{	317	{
218	iterator i;	318	iterator i;
219		319
220	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
221	if (i->host == host)	321	if (i->host == host)
222	break;	322	break;
223	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	324	i = erase (i);
225	else	325	else
226	i++;	326	i++;
227		327
228	if (i == end ())	328	if (i == end ())
…		…
230	net_rateinfo ri;	330	net_rateinfo ri;
231		331
232	ri.host = host;	332	ri.host = host;
233	ri.pcnt = 1.;	333	ri.pcnt = 1.;
234	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	335	ri.last = ev_now ();
236		336
237	push_front (ri);	337	push_front (ri);
238		338
239	return true;	339	return true;
240	}	340	}
…		…
242	{	342	{
243	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
244	erase (i);	344	erase (i);
245		345
246	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		348
249	ri.last = NOW;	349	ri.last = ev_now ();
250		350
251	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
252		352
253	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
254		354
…		…
266	}	366	}
267	}	367	}
268		368
269	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
270		370
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
274	{	373	{
275	unsigned int xlen;
276
277	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
278		375
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
281	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	379	}
284		380
285	void	381	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	383	{
288	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		385	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	387	}
292		388
293	bool	389	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	391	{
296	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		393	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
299	}	395	}
300		396
		397	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	399	{
303	type = type_;	400	type = type_;
304		401
305	int src = THISNODE->id;	402	int src = THISNODE->id;
306		403
…		…
308	srcdst = ((src >> 8) << 4) | (dst >> 8);	405	srcdst = ((src >> 8) << 4) | (dst >> 8);
309	dst1 = dst;	406	dst1 = dst;
310	}	407	}
311		408
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		410
315	struct vpndata_packet : vpn_packet	411	struct vpndata_packet : vpn_packet
		412	{
		413	u32 ctr; // seqno
		414	u8 data[MAXVPNDATA];
		415
		416	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		417	tap_packet *unpack (connection *conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
316	{	421	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno	422	// the distance from beginning of packet to data member
318		423	return data - at (0);
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	424	}
		425	};
		426
		427	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		428	static unsigned char *
		429	expand_iv (u32 ctr)
		430	{
		431	static u32 iv[IV_SIZE (CIPHER) / 4];
		432
		433	require (sizeof (iv) == 4 * 4);
		434	require (IV_SIZE (CIPHER) % 4 == 0);
		435
		436	iv[0] =
		437	iv[1] =
		438	iv[2] = ctr;
		439
		440	// I would reuse ctr here to to avoid potential endianness issues,
		441	// but it seems openssl wraps around. While this would be still ok,
		442	// and I don't even know if its true, let's play safe and initialise
		443	// to 0.
		444	iv[3] = 0;
		445
		446	return (unsigned char *)iv;
		447	}
328		448
329	void	449	void
330	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	450	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
331	{	451	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	452	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
334	ptype type = PT_DATA_UNCOMPRESSED;	454	ptype type = PT_DATA_UNCOMPRESSED;
335		455
336	#if ENABLE_COMPRESSION	456	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	457	u8 cdata[MAX_MTU];
338		458
339	if (conn->features & ENABLE_COMPRESSION)	459	if (conn->features & FEATURE_COMPRESSION)
340	{	460	{
341	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	461	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
342		462
343	if (cl)	463	if (cl)
344	{	464	{
…		…
350	d[1] = cl;	470	d[1] = cl;
351	}	471	}
352	}	472	}
353	#endif	473	#endif
354		474
		475	ctr = htonl (seqno);
		476
355	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	477	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
356
357	struct {
358	#if RAND_SIZE
359	u8 rnd[RAND_SIZE];
360	#endif
361	u32 seqno;
362	} datahdr;
363
364	datahdr.seqno = ntohl (seqno);
365	#if RAND_SIZE
366	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
367	#endif
368		478
369	require (EVP_EncryptUpdate (cctx,	479	require (EVP_EncryptUpdate (cctx,
370	(unsigned char *) data + outl, &outl2,	480	(unsigned char *)data + outl, &outl2,
371	(unsigned char *) &datahdr, DATAHDR));	481	(unsigned char *)d, l));
372	outl += outl2;	482	outl += outl2;
373		483
374	require (EVP_EncryptUpdate (cctx,	484	// it seems this is a nop for us, but we do it anyways
375	(unsigned char *) data + outl, &outl2,	485	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
376	(unsigned char *) d, l));
377	outl += outl2;	486	outl += outl2;
378		487
379	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
380	outl += outl2;
381
382	len = outl + data_hdr_size ();	488	len = data_hdr_size () + outl;
383		489
384	set_hdr (type, dst);	490	set_hdr (type, dst);
385		491
386	hmac_set (conn->octx);	492	hmac_set (conn->octx);
387	}	493	}
…		…
391	{	497	{
392	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	498	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
393	int outl = 0, outl2;	499	int outl = 0, outl2;
394	tap_packet *p = new tap_packet;	500	tap_packet *p = new tap_packet;
395	u8 *d;	501	u8 *d;
396	u32 l = len - data_hdr_size ();
397		502
		503	seqno = ntohl (ctr);
		504
398	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	505	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
399		506
400	#if ENABLE_COMPRESSION	507	#if ENABLE_COMPRESSION
401	u8 cdata[MAX_MTU];	508	u8 cdata[MAX_MTU];
402		509
403	if (type == PT_DATA_COMPRESSED)	510	if (type == PT_DATA_COMPRESSED)
404	d = cdata;	511	d = cdata;
405	else	512	else
406	#endif	513	#endif
407	d = &(*p)[6 + 6 - DATAHDR];	514	d = &(*p)[6 + 6];
408		515
409	/* this overwrites part of the src mac, but we fix that later */	516	// this can overwrite the len/dst/src fields
410	require (EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
411	d, &outl2,	518	d, &outl2,
412	(unsigned char *)&data, len - data_hdr_size ()));	519	(unsigned char *)&data, len - data_hdr_size ()));
413	outl += outl2;	520	outl += outl2;
414		521
		522	// it seems this is a nop for us, but we do it anyways
415	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	523	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
416	outl += outl2;	524	outl += outl2;
417		525
418	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
419
420	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
421	id2mac (src (), p->src);	527	id2mac (src (), p->src);
422		528
423	#if ENABLE_COMPRESSION	529	#if ENABLE_COMPRESSION
424	if (type == PT_DATA_COMPRESSED)	530	if (type == PT_DATA_COMPRESSED)
425	{	531	{
426	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	532	u32 cl = (d[0] << 8) | d[1];
427		533
428	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	534	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
429	&(*p)[6 + 6], MAX_MTU)	535	&(*p)[6 + 6], MAX_MTU)
430	+ 6 + 6;	536	+ 6 + 6;
431	}	537	}
432	else	538	else
433	p->len = outl + (6 + 6 - DATAHDR);	539	p->len = outl + (6 + 6);
434	#endif	540	#endif
435		541
436	return p;	542	return p;
437	}	543	}
438		544
…		…
445	}	551	}
446	};	552	};
447		553
448	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
449	{	555	{
450	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
451	// field comes before this data, so peers with other
452	// hmacs simply will not work.
453	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
454	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
455	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
456		560
457	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
458	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
459		563
460	static u8 get_features ()	564	static u8 get_features ()
461	{	565	{
462	u8 f = 0;	566	u8 f = 0;
463	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
464	f |= FEATURE_COMPRESSION;	568	f |= FEATURE_COMPRESSION;
465	#endif	569	#endif
466	#if ENABLE_ROHC	570	#if ENABLE_ROHC
467	f |= FEATURE_ROHC;	571	f |= FEATURE_ROHC;
468	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
469	return f;	576	return f;
470	}	577	}
471	};	578	};
472		579
		580	void
473	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
474	{	582	{
475	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
476	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
477	randsize = RAND_SIZE;
478	hmaclen = HMACLENGTH;
479	flags = 0;	585	flags = 0;
480	challengelen = sizeof (rsachallenge);
481	features = get_features ();	586	features = get_features ();
482		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
483	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
484	digest_nid = htonl (EVP_MD_type (RSA_HASH));
485	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 ()));
486		593
487	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
488	set_hdr (type, dst);	595	set_hdr (type, dst);
489	}	596	}
490		597
491	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
492	{	600	{
493	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
494	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)"),
495	else if (randsize != RAND_SIZE)	603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
496	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
497	else if (hmaclen != HMACLENGTH)
498	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
499	else if (challengelen != sizeof (rsachallenge))
500	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
501	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
502	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	605	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
503	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	606	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
504	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
505	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	607	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
506	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	608	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		609	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		610	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		611	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
507	else	613	else
		614	{
		615	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		616
		617	if (cmp > 0)
		618	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		619	conf->nodename, (const char *)rsi);
		620	else if (cmp == 0)
508	return true;	621	return true;
		622	}
509		623
510	return false;	624	return false;
511	}	625	}
512		626
513	struct auth_req_packet : config_packet	627	struct auth_req_packet : config_packet // UNPROTECTED
514	{	628	{
515	char magic[8];	629	char magic[8];
516	u8 initiate; // false if this is just an automatic reply	630	u8 initiate; // false if this is just an automatic reply
517	u8 protocols; // supported protocols (will be patched on forward)	631	u8 protocols; // supported protocols (will be patched on forward)
518	u8 pad2, pad3;	632	u8 pad2, pad3;
519	rsaid id;	633	auth_encr encr;
520	rsaencrdata encr;
521		634
522	auth_req_packet (int dst, bool initiate_, u8 protocols_)	635	auth_req_packet (int dst, bool initiate_, u8 protocols_)
523	{	636	{
524	config_packet::setup (PT_AUTH_REQ, dst);	637	config_packet::setup (PT_AUTH_REQ, dst);
525	strncpy (magic, MAGIC, 8);	638	memcpy (magic, MAGIC, 8);
526	initiate = !!initiate_;	639	initiate = !!initiate_;
527	protocols = protocols_;	640	protocols = protocols_;
528		641
529	len = sizeof (*this) - sizeof (net_packet);	642	len = sizeof (*this) - sizeof (net_packet);
530	}	643	}
531	};	644	};
532		645
533	struct auth_res_packet : config_packet	646	struct auth_res_packet : vpn_packet // UNPROTECTED
534	{	647	{
535	rsaid id;
536	u8 pad1, pad2, pad3;
537	u8 response_len; // encrypted length
538	rsaresponse response;	648	auth_response response;
539		649
540	auth_res_packet (int dst)	650	auth_res_packet (int dst)
541	{	651	{
542	config_packet::setup (PT_AUTH_RES, dst);	652	set_hdr (PT_AUTH_RES, dst);
543		653
544	len = sizeof (*this) - sizeof (net_packet);	654	len = sizeof (*this) - sizeof (net_packet);
545	}	655	}
546	};	656	};
547		657
…		…
577	};	687	};
578		688
579	/////////////////////////////////////////////////////////////////////////////	689	/////////////////////////////////////////////////////////////////////////////
580		690
581	void	691	void
582	connection::connection_established ()	692	connection::connection_established (const sockinfo &rsi)
583	{	693	{
584	if (ictx && octx)	694	if (!have_snd_auth || !have_rcv_auth)
		695	return;
		696
		697	si = rsi;
		698	protocol = rsi.prot;
		699
		700	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		701	conf->nodename, (const char *)rsi,
		702	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		703	PROTOCOL_MAJOR, prot_minor);
		704
		705	if (::conf.script_node_up)
		706	{
		707	run_script_cb *cb = new run_script_cb;
		708	cb->set<connection, &connection::script_node_up> (this);
		709	run_script_queued (cb, _("node-up command execution failed, continuing."));
585	{	710	}
586	connectmode = conf->connectmode;	711
		712	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		713	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
587		714
		715	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		716	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		717
588	// make sure rekeying timeouts are slightly asymmetric	718	// make sure rekeying timeouts are slightly asymmetric
589	rekey.start (NOW + ::conf.rekey	719	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
590	+ (conf->id > THISNODE->id ? 10 : 0));	720	rekey.start (rekey_interval, rekey_interval);
		721
		722	hmac_error = 0.;
		723
591	keepalive.start (NOW + ::conf.keepalive);	724	keepalive.start (::conf.keepalive);
592		725
593	// send queued packets	726	// send queued packets
594	if (ictx && octx)
595	{
596	while (tap_packet *p = (tap_packet *)data_queue.get ())	727	while (tap_packet *p = (tap_packet *)data_queue.get ())
597	{	728	{
598	send_data_packet (p);	729	if (p->len) send_data_packet (p);
599	delete p;	730	delete p;
600	}	731	}
601		732
602	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	733	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
603	{	734	{
604	send_vpn_packet (p, si, IPTOS_RELIABILITY);	735	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
605	delete p;	736	delete p;
606	}
607	}
608	}	737	}
		738
		739	vpn->connection_established (this);
		740	}
		741
		742	void
		743	connection::reset_si ()
		744	{
		745	if (vpn->can_direct (THISNODE, conf))
		746	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
609	else	747	else
610	{	748	{
611	retry_cnt = 0;	749	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
612	establish_connection.start (NOW + 5);	750	protocol = 0;
613	keepalive.stop ();
614	rekey.stop ();
615	}	751	}
616	}
617
618	void
619	connection::reset_si ()
620	{
621	protocol = best_protocol (THISNODE->protocols & conf->protocols);
622
623	// mask out protocols we cannot establish
624	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
625	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
626	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
627		752
628	si.set (conf, protocol);	753	si.set (conf, protocol);
629	}	754	}
630		755
631	// ensure sockinfo is valid, forward if necessary	756	// ensure sockinfo is valid, forward if necessary
632	const sockinfo &	757	const sockinfo &
633	connection::forward_si (const sockinfo &si) const	758	connection::forward_si (const sockinfo &si) const
634	{	759	{
635	if (!si.valid ())	760	if (!si.valid ())
636	{	761	{
637	connection *r = vpn->find_router ();	762	connection *r = vpn->find_router_for (this);
638		763
639	if (r)	764	if (r)
640	{	765	{
641	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	766	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
642	conf->nodename, r->conf->nodename, (const char *)r->si);	767	conf->nodename, r->conf->nodename);
643	return r->si;	768	return r->si;
644	}	769	}
645	else	770	else
646	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	771	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
647	conf->nodename);	772	conf->nodename);
648	}	773	}
649		774
650	return si;	775	return si;
651	}	776	}
652		777
653	void	778	void
654	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	779	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
655	{	780	{
656	if (!vpn->send_vpn_packet (pkt, si, tos))	781	if (!vpn->send_vpn_packet (pkt, si, tos))
657	reset_connection ();	782	reset_connection ("packet send error");
658	}	783	}
659		784
660	void	785	void
661	connection::send_ping (const sockinfo &si, u8 pong)	786	connection::send_ping (const sockinfo &si, u8 pong)
662	{	787	{
663	ping_packet *pkt = new ping_packet;	788	ping_packet *pkt = new ping_packet;
664		789
665	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	790	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		791
		792	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
666	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	793	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
667		794
668	delete pkt;	795	delete pkt;
669	}	796	}
670		797
…		…
685	void	812	void
686	connection::send_auth_request (const sockinfo &si, bool initiate)	813	connection::send_auth_request (const sockinfo &si, bool initiate)
687	{	814	{
688	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	815	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
689		816
690	rsachallenge chg;	817	generate_auth_data ();
691	rsa_cache.gen (pkt->id, chg);
692	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	818	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
693		819
694	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	820	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
695
696	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	821	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
697		822
698	delete pkt;	823	delete pkt;
699	}	824	}
700		825
701	void	826	void
702	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	827	connection::send_auth_response (const sockinfo &si)
703	{	828	{
704	auth_res_packet *pkt = new auth_res_packet (conf->id);	829	auth_res_packet *pkt = new auth_res_packet (conf->id);
705		830
706	pkt->id = id;	831	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		832	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
707		833
708	rsa_hash (id, chg, pkt->response);
709
710	pkt->hmac_set (octx);
711
712	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	834	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
713
714	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	835	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
715		836
716	delete pkt;	837	delete pkt;
717	}	838	}
718		839
719	void	840	void
720	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	841	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
721	{	842	{
722	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	843	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
723	conf->id, rid, (const char *)rsi);	844	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		845	conf->protocols);
724		846
725	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	847	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
726		848
727	r->hmac_set (octx);	849	r->hmac_set (octx);
728	send_vpn_packet (r, si);	850	send_vpn_packet (r, si);
729		851
730	delete r;	852	delete r;
731	}	853	}
732		854
733	void	855	inline void
734	connection::establish_connection_cb (time_watcher &w)	856	connection::establish_connection_cb (ev::timer &w, int revents)
735	{	857	{
736	if (!ictx	858	if (!(ictx && octx)
737	&& conf != THISNODE	859	&& conf != THISNODE
738	&& connectmode != conf_node::C_NEVER	860	&& connectmode != conf_node::C_NEVER
739	&& connectmode != conf_node::C_DISABLED	861	&& connectmode != conf_node::C_DISABLED
740	&& NOW > w.at)	862	&& !w.is_active ())
741	{	863	{
742	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	864	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		865	// and stop trying. should probably be handled by a per-connection expire handler.
		866	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		867	{
		868	reset_connection ("no demand");
		869	return;
		870	}
743		871
744	double retry_int = double (retry_cnt & 3	872	last_establish_attempt = ev_now ();
		873
		874	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
745	? (retry_cnt & 3) + 1	875	? (retry_cnt & 3) + 1
746	: 1 << (retry_cnt >> 2));	876	: 1 << (retry_cnt >> 2));
747		877
748	reset_si ();	878	reset_si ();
749		879
750	bool slow = si.prot & PROT_SLOW;	880	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
751		881
752	if (si.prot && !si.host)	882	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		883	{
		884	/*TODO*/ /* start the timer so we don't recurse endlessly */
		885	w.start (1);
753	vpn->send_connect_request (conf->id);	886	vpn->send_connect_request (this);
		887	}
754	else	888	else
755	{	889	{
		890	if (si.valid ())
		891	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		892	conf->nodename, (const char *)si);
		893
756	const sockinfo &dsi = forward_si (si);	894	const sockinfo &dsi = forward_si (si);
757		895
758	slow = slow || (dsi.prot & PROT_SLOW);	896	slow = slow || (dsi.prot & PROT_SLOW);
759		897
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	898	if (dsi.valid () && auth_rate_limiter.can (dsi))
761	{	899	{
762	if (retry_cnt < 4)	900	// use ping after the first few retries
		901	// TODO: on rekeys, the other node might not interpret ping correctly,
		902	// TODO: as it will still have a valid connection
		903	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
763	send_auth_request (dsi, true);	904	send_auth_request (dsi, true);
764	else	905	else
765	send_ping (dsi, 0);	906	send_ping (dsi, 0);
766	}	907	}
767	}	908	}
768		909
769	retry_int *= slow ? 8. : 0.7;	910	retry_int *= slow ? 4. : 0.9;
770		911
771	if (retry_int < conf->max_retry)	912	if (retry_int < conf->max_retry)
772	retry_cnt++;	913	retry_cnt++;
773	else	914	else
774	retry_int = conf->max_retry;	915	retry_int = conf->max_retry;
775		916
776	w.start (NOW + retry_int);	917	w.start (retry_int);
777	}	918	}
778	}	919	}
779		920
780	void	921	void
781	connection::reset_connection ()	922	connection::reset_connection (const char *reason)
782	{	923	{
783	if (ictx && octx)	924	if (ictx && octx)
784	{	925	{
785	slog (L_INFO, _("%s(%s): connection lost"),	926	slog (L_INFO, _("%s(%s): connection lost (%s)"),
786	conf->nodename, (const char *)si);	927	conf->nodename, (const char *)si, reason);
787		928
788	if (::conf.script_node_down)	929	if (::conf.script_node_down)
789	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	930	{
		931	run_script_cb *cb = new run_script_cb;
		932	cb->set<connection, &connection::script_node_down> (this);
790	slog (L_WARN, _("node-down command execution failed, continuing."));	933	run_script_queued (cb, _("node-down command execution failed, continuing."));
		934	}
791	}	935	}
792		936
793	delete ictx; ictx = 0;	937	delete ictx; ictx = 0;
794	delete octx; octx = 0;	938	delete octx; octx = 0;
795	#if ENABLE_DNS
796	dnsv4_reset_connection ();
797	#endif
798		939
799	si.host = 0;	940	si.host = 0;
800		941
		942	have_snd_auth = false;
		943	have_rcv_auth = false;
		944	auth_expire = 0.;
		945
801	last_activity = 0;	946	last_activity = 0.;
		947	//last_si_change = 0.;
802	retry_cnt = 0;	948	retry_cnt = 0;
803		949
804	rekey.stop ();	950	rekey.stop ();
805	keepalive.stop ();	951	keepalive.stop ();
806	establish_connection.stop ();	952	establish_connection.stop ();
…		…
810	connection::shutdown ()	956	connection::shutdown ()
811	{	957	{
812	if (ictx && octx)	958	if (ictx && octx)
813	send_reset (si);	959	send_reset (si);
814		960
815	reset_connection ();	961	reset_connection ("shutdown");
816	}	962	}
817		963
818	void	964	// poor-man's rekeying
819	connection::rekey_cb (time_watcher &w)	965	inline void
		966	connection::rekey_cb (ev::timer &w, int revents)
820	{	967	{
821	reset_connection ();	968	reset_connection ("rekeying");
822	establish_connection ();	969	establish_connection ();
823	}	970	}
824		971
825	void	972	void
826	connection::send_data_packet (tap_packet *pkt)	973	connection::send_data_packet (tap_packet *pkt)
…		…
840	if (oseqno > MAX_SEQNO)	987	if (oseqno > MAX_SEQNO)
841	rekey ();	988	rekey ();
842	}	989	}
843		990
844	void	991	void
		992	connection::post_inject_queue ()
		993	{
		994	// force a connection every now and when when packets are sent (max 1/s)
		995	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		996	establish_connection.stop ();
		997
		998	establish_connection ();
		999	}
		1000
		1001	void
845	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1002	connection::inject_data_packet (tap_packet *pkt)
846	{	1003	{
847	if (ictx && octx)	1004	if (ictx && octx)
848	send_data_packet (pkt);	1005	send_data_packet (pkt);
849	else	1006	else
850	{	1007	{
851	if (!broadcast)
852	data_queue.put (new tap_packet (*pkt));	1008	data_queue.put (new tap_packet (*pkt));
853		1009	post_inject_queue ();
854	establish_connection ();
855	}	1010	}
856	}	1011	}
857		1012
		1013	void
858	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1014	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
859	{	1015	{
860	if (ictx && octx)	1016	if (ictx && octx)
861	send_vpn_packet (pkt, si, tos);	1017	send_vpn_packet (pkt, si, tos);
862	else	1018	else
863	{	1019	{
864	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1020	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
865		1021	post_inject_queue ();
866	establish_connection ();
867	}	1022	}
868	}	1023	}
869		1024
870	void	1025	void
871	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1026	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
872	{	1027	{
873	last_activity = NOW;	1028	last_activity = ev_now ();
874		1029
875	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1030	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
876	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1031	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1032
		1033	if (connectmode == conf_node::C_DISABLED)
		1034	return;
877		1035
878	switch (pkt->typ ())	1036	switch (pkt->typ ())
879	{	1037	{
880	case vpn_packet::PT_PING:	1038	case vpn_packet::PT_PING:
		1039	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1040
881	// we send pings instead of auth packets after some retries,	1041	// we send pings instead of auth packets after some retries,
882	// so reset the retry counter and establish a connection	1042	// so reset the retry counter and establish a connection
883	// when we receive a ping.	1043	// when we receive a ping.
884	if (!ictx)	1044	if (!ictx)
885	{	1045	{
886	if (auth_rate_limiter.can (rsi))	1046	if (auth_rate_limiter.can (rsi))
887	send_auth_request (rsi, true);	1047	send_auth_request (rsi, true);
888	}	1048	}
889	else	1049	else
		1050	// we would love to change the socket address here, but ping's aren't
		1051	// authenticated, so we best ignore it.
890	send_ping (rsi, 1); // pong	1052	send_ping (rsi, 1); // pong
891		1053
892	break;	1054	break;
893		1055
894	case vpn_packet::PT_PONG:	1056	case vpn_packet::PT_PONG:
		1057	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1058
		1059	// a PONG might mean that the other side doesn't really know
		1060	// about our desire for communication.
		1061	establish_connection ();
895	break;	1062	break;
896		1063
897	case vpn_packet::PT_RESET:	1064	case vpn_packet::PT_RESET:
		1065	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1066
		1067	if (ictx && octx)
898	{	1068	{
899	reset_connection ();	1069	reset_connection ("remote reset");
900		1070
901	config_packet *p = (config_packet *) pkt;	1071	config_packet *p = (config_packet *) pkt;
902		1072
903	if (!p->chk_config ())	1073	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
904	{
905	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
906	conf->nodename, (const char *)rsi);
907	connectmode = conf_node::C_DISABLED;
908	}
909	else if (connectmode == conf_node::C_ALWAYS)
910	establish_connection ();	1074	establish_connection ();
911	}	1075	}
		1076
912	break;	1077	break;
913		1078
914	case vpn_packet::PT_AUTH_REQ:	1079	case vpn_packet::PT_AUTH_REQ:
915	if (auth_rate_limiter.can (rsi))	1080	if (auth_rate_limiter.can (rsi))
916	{	1081	{
917	auth_req_packet *p = (auth_req_packet *) pkt;	1082	auth_req_packet *p = (auth_req_packet *)pkt;
918		1083
919	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1084	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1085	conf->nodename, p->initiate ? "initiate" : "reply",
		1086	p->protocols, p->features);
920		1087
921	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1088	if (memcmp (p->magic, MAGIC, 8))
		1089	{
		1090	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1091	conf->nodename, (const char *)rsi);
		1092	}
		1093	else if (p->chk_config (conf, rsi))
922	{	1094	{
923	if (p->prot_minor != PROTOCOL_MINOR)	1095	if (p->prot_minor != PROTOCOL_MINOR)
924	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1096	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
925	conf->nodename, (const char *)rsi,	1097	conf->nodename, (const char *)rsi,
926	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1098	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
927		1099
928	if (p->initiate)	1100	if (p->initiate)
		1101	{
929	send_auth_request (rsi, false);	1102	send_auth_request (rsi, false);
930		1103
931	rsachallenge k;	1104	if (ictx && octx)
		1105	reset_connection ("reconnect");
		1106	}
932		1107
		1108	auth_data auth;
		1109
933	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1110	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
934	{	1111	{
935	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1112	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
936	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1113	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
937	break;
938	}	1114	}
939	else	1115	else
940	{	1116	{
941	delete octx;	1117	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
942		1118
943	octx = new crypto_ctx (k, 1);	1119	rcv_auth = auth;
944	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1120	have_rcv_auth = true;
945		1121
		1122	send_auth_response (rsi);
		1123
		1124	if (chg)
		1125	{
946	conf->protocols = p->protocols;	1126	conf->protocols = p->protocols;
947	features = p->features & config_packet::get_features ();	1127	features = p->features & config_packet::get_features ();
948		1128
949	send_auth_response (rsi, p->id, k);
950
951	connection_established ();	1129	connection_established (rsi);
952
953	break;	1130	}
954	}	1131	}
		1132
		1133	break;
955	}	1134	}
956	else
957	slog (L_WARN, _("%s(%s): protocol mismatch"),
958	conf->nodename, (const char *)rsi);
959		1135
960	send_reset (rsi);	1136	send_reset (rsi);
961	}	1137	}
962		1138
963	break;	1139	break;
964		1140
965	case vpn_packet::PT_AUTH_RES:	1141	case vpn_packet::PT_AUTH_RES:
966	{	1142	{
967	auth_res_packet *p = (auth_res_packet *) pkt;	1143	auth_res_packet *p = (auth_res_packet *)pkt;
968		1144
969	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1145	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
970		1146
971	if (p->chk_config ())	1147	auth_mac local_mac;
		1148	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1149
		1150	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
972	{	1151	{
973	if (p->prot_minor != PROTOCOL_MINOR)
974	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
975	conf->nodename, (const char *)rsi,
976	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
977
978	rsachallenge chg;
979
980	if (!rsa_cache.find (p->id, chg))
981	{
982	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1152	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
983	conf->nodename, (const char *)rsi);	1153	conf->nodename, (const char *)rsi);
984	break;
985	}	1154	}
986	else	1155	else if (!have_snd_auth)
987	{	1156	{
988	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1157	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
989		1158
990	if (!p->hmac_chk (cctx))	1159	have_snd_auth = true;
991	{
992	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
993	"could be an attack, or just corruption or a synchronization error"),
994	conf->nodename, (const char *)rsi);
995	break;
996	}
997	else
998	{
999	rsaresponse h;
1000
1001	rsa_hash (p->id, chg, h);
1002
1003	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1004	{
1005	prot_minor = p->prot_minor;
1006
1007	delete ictx; ictx = cctx;
1008
1009	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1010
1011	si = rsi;
1012	protocol = rsi.prot;
1013
1014	connection_established ();	1160	connection_established (rsi);
1015
1016	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1017	conf->nodename, (const char *)rsi,
1018	p->prot_major, p->prot_minor);
1019
1020	if (::conf.script_node_up)
1021	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1022	slog (L_WARN, _("node-up command execution failed, continuing."));
1023
1024	break;
1025	}
1026	else
1027	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1028	conf->nodename, (const char *)rsi);
1029	}
1030
1031	delete cctx;
1032	}
1033	}	1161	}
1034	}	1162	}
1035
1036	send_reset (rsi);
1037	break;	1163	break;
1038		1164
1039	case vpn_packet::PT_DATA_COMPRESSED:	1165	case vpn_packet::PT_DATA_COMPRESSED:
1040	#if !ENABLE_COMPRESSION	1166	#if !ENABLE_COMPRESSION
1041	send_reset (rsi);	1167	send_reset (rsi);
…		…
1047	if (ictx && octx)	1173	if (ictx && octx)
1048	{	1174	{
1049	vpndata_packet *p = (vpndata_packet *)pkt;	1175	vpndata_packet *p = (vpndata_packet *)pkt;
1050		1176
1051	if (!p->hmac_chk (ictx))	1177	if (!p->hmac_chk (ictx))
		1178	{
		1179	// rekeying often creates temporary hmac auth floods
		1180	// we assume they don't take longer than a few seconds normally,
		1181	// and suppress messages and resets during that time.
		1182	//TODO: should be done per source address
		1183	if (!hmac_error)
		1184	{
		1185	hmac_error = ev_now () + 3;
		1186	break;
		1187	}
		1188	else if (hmac_error >= ev_now ())
		1189	break; // silently suppress
		1190	else
		1191	{
1052	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1192	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1053	"could be an attack, or just corruption or a synchronization error"),	1193	"could be an attack, or just corruption or a synchronization error."),
1054	conf->nodename, (const char *)rsi);	1194	conf->nodename, (const char *)rsi);
		1195	// reset
		1196	}
		1197	}
1055	else	1198	else
1056	{	1199	{
1057	u32 seqno;	1200	u32 seqno;
1058	tap_packet *d = p->unpack (this, seqno);	1201	tap_packet *d = p->unpack (this, seqno);
		1202	int seqclass = iseqno.seqno_classify (seqno);
1059		1203
1060	if (iseqno.recv_ok (seqno))	1204	hmac_error = 0;
		1205
		1206	if (seqclass == 0) // ok
1061	{	1207	{
1062	vpn->tap->send (d);	1208	vpn->tap->send (d);
1063		1209
1064	if (si != rsi)	1210	if (si != rsi)
1065	{	1211	{
1066	// fast re-sync on source address changes, useful especially for tcp/ip	1212	// fast re-sync on source address changes, useful especially for tcp/ip
		1213	//if (last_si_change < ev_now () + 5.)
1067	si = rsi;	1214	// {
1068
1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1215	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1070	conf->nodename, (const char *)si, (const char *)rsi);	1216	conf->nodename, (const char *)si, (const char *)rsi);
		1217
		1218	si = rsi;
		1219
		1220	if (::conf.script_node_change)
		1221	{
		1222	run_script_cb *cb = new run_script_cb;
		1223	cb->set<connection, &connection::script_node_change> (this);
		1224	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1225	}
		1226
		1227	// }
		1228	//else
		1229	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1230	// conf->nodename, (const char *)si, (const char *)rsi);
1071	}	1231	}
		1232	}
		1233	else if (seqclass == 1) // far history
		1234	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1235	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1236	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1237	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1238	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1239	else if (seqclass == 3) // reset
		1240	{
		1241	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1242	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1243	send_reset (rsi);
1072	}	1244	}
1073		1245
1074	delete d;	1246	delete d;
1075	break;	1247	break;
1076	}	1248	}
…		…
1080	break;	1252	break;
1081		1253
1082	case vpn_packet::PT_CONNECT_REQ:	1254	case vpn_packet::PT_CONNECT_REQ:
1083	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1255	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1084	{	1256	{
1085	connect_req_packet *p = (connect_req_packet *) pkt;	1257	connect_req_packet *p = (connect_req_packet *)pkt;
1086		1258
1087	if (p->id > 0 && p->id <= vpn->conns.size ())	1259	if (p->id > 0 && p->id <= vpn->conns.size ())
1088	{	1260	{
1089	connection *c = vpn->conns[p->id - 1];	1261	connection *c = vpn->conns[p->id - 1];
1090	conf->protocols = p->protocols;	1262	conf->protocols = p->protocols;
1091		1263
1092	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1264	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1265	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1266	p->protocols,
1093	conf->id, p->id, c->ictx && c->octx);	1267	c->ictx && c->octx);
1094		1268
1095	if (c->ictx && c->octx)	1269	if (c->ictx && c->octx)
1096	{	1270	{
1097	// send connect_info packets to both sides, in case one is	1271	// send connect_info packets to both sides, in case one is
1098	// behind a nat firewall (or both ;)	1272	// behind a nat firewall (or both ;)
…		…
1121		1295
1122	c->conf->protocols = p->protocols;	1296	c->conf->protocols = p->protocols;
1123	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1297	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1124	p->si.upgrade_protocol (protocol, c->conf);	1298	p->si.upgrade_protocol (protocol, c->conf);
1125		1299
1126	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1300	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1127	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1301	conf->nodename,
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si,
		1304	p->protocols,
		1305	protocol,
		1306	p->si.supported_protocols (c->conf),
		1307	!c->ictx && !c->octx);
1128		1308
1129	const sockinfo &dsi = forward_si (p->si);	1309	const sockinfo &dsi = forward_si (p->si);
1130		1310
1131	if (dsi.valid ())	1311	if (dsi.valid ())
1132	c->send_auth_request (dsi, true);	1312	c->send_auth_request (dsi, true);
		1313	else
		1314	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1315	vpn->conns[p->id - 1]->conf->nodename,
		1316	(const char *)p->si);
1133	}	1317	}
1134	else	1318	else
1135	slog (L_WARN,	1319	slog (L_WARN,
1136	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1320	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1137	p->id);	1321	p->id);
…		…
1143	send_reset (rsi);	1327	send_reset (rsi);
1144	break;	1328	break;
1145	}	1329	}
1146	}	1330	}
1147		1331
1148	void connection::keepalive_cb (time_watcher &w)	1332	inline void
		1333	connection::keepalive_cb (ev::timer &w, int revents)
1149	{	1334	{
1150	if (NOW >= last_activity + ::conf.keepalive + 30)	1335	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1336
		1337	if (when >= 0)
		1338	w.start (when);
		1339	else if (when < -15)
1151	{	1340	{
1152	reset_connection ();	1341	reset_connection ("keepalive overdue");
1153	establish_connection ();	1342	establish_connection ();
1154	}	1343	}
1155	else if (NOW < last_activity + ::conf.keepalive)
1156	w.start (last_activity + ::conf.keepalive);
1157	else if (conf->connectmode != conf_node::C_ONDEMAND	1344	else if (conf->connectmode != conf_node::C_ONDEMAND
1158	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1345	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1159	{	1346	{
		1347	w.start (3);
1160	send_ping (si);	1348	send_ping (si);
1161	w.start (NOW + 5);
1162	}	1349	}
1163	else if (NOW < last_activity + ::conf.keepalive + 10)	1350	else if (when >= -10)
1164	// hold ondemand connections implicitly a few seconds longer	1351	// hold ondemand connections implicitly a few seconds longer
1165	// should delete octx, though, or something like that ;)	1352	// should delete octx, though, or something like that ;)
1166	w.start (last_activity + ::conf.keepalive + 10);	1353	w.start (when + 10);
1167	else	1354	else
1168	reset_connection ();	1355	reset_connection ("keepalive timeout");
1169	}	1356	}
1170		1357
		1358	void
1171	void connection::send_connect_request (int id)	1359	connection::send_connect_request (int id)
1172	{	1360	{
1173	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1361	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1174		1362
1175	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1363	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1364	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1365	THISNODE->protocols);
1176	p->hmac_set (octx);	1366	p->hmac_set (octx);
1177	send_vpn_packet (p, si);	1367	send_vpn_packet (p, si);
1178		1368
1179	delete p;	1369	delete p;
1180	}	1370	}
1181		1371
		1372	void
1182	void connection::script_init_env (const char *ext)	1373	connection::script_init_env (const char *ext)
1183	{	1374	{
1184	char *env;	1375	char *env;
1185	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1376	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1186	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1377	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1187	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1378	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1188	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1379	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1189	conf->id & 0xff); putenv (env);	1380	conf->id & 0xff); putenv (env);
1190	}	1381	}
1191		1382
		1383	void
1192	void connection::script_init_connect_env ()	1384	connection::script_init_connect_env ()
1193	{	1385	{
1194	vpn->script_init_env ();	1386	vpn->script_init_env ();
1195		1387
1196	char *env;	1388	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1389	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1390	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1391	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1392	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1393	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1394	}
1202		1395
		1396	inline const char *
1203	const char *connection::script_node_up ()	1397	connection::script_node_up ()
1204	{	1398	{
1205	script_init_connect_env ();	1399	script_init_connect_env ();
1206		1400
1207	putenv ("STATE=up");	1401	putenv ((char *)"STATE=up");
1208		1402
1209	char *filename;	1403	char *filename;
1210	asprintf (&filename,	1404	asprintf (&filename,
1211	"%s/%s",	1405	"%s/%s",
1212	confbase,	1406	confbase,
1213	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1407	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1214		1408
1215	return filename;	1409	return filename;
1216	}	1410	}
1217		1411
1218	const char *connection::script_node_down ()	1412	inline const char *
		1413	connection::script_node_change ()
1219	{	1414	{
1220	script_init_connect_env ();	1415	script_init_connect_env ();
1221		1416
		1417	putenv ((char *)"STATE=change");
		1418
		1419	char *filename;
		1420	asprintf (&filename,
		1421	"%s/%s",
		1422	confbase,
		1423	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1424
		1425	return filename;
		1426	}
		1427
		1428	inline const char *
		1429	connection::script_node_down ()
		1430	{
		1431	script_init_connect_env ();
		1432
1222	putenv ("STATE=down");	1433	putenv ((char *)"STATE=down");
1223		1434
1224	char *filename;	1435	char *filename;
1225	asprintf (&filename,	1436	asprintf (&filename,
1226	"%s/%s",	1437	"%s/%s",
1227	confbase,	1438	confbase,
…		…
1229		1440
1230	return filename;	1441	return filename;
1231	}	1442	}
1232		1443
1233	connection::connection (struct vpn *vpn, conf_node *conf)	1444	connection::connection (struct vpn *vpn, conf_node *conf)
1234	: vpn(vpn), conf(conf)	1445	: vpn(vpn), conf(conf),
1235	, rekey (this, &connection::rekey_cb)
1236	, keepalive (this, &connection::keepalive_cb)
1237	, establish_connection (this, &connection::establish_connection_cb)
1238	#if ENABLE_DNS	1446	#if ENABLE_DNS
1239	, dns (0)	1447	dns (0),
1240	#endif	1448	#endif
		1449	data_queue(conf->max_ttl, conf->max_queue + 1),
		1450	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1241	{	1451	{
		1452	rekey .set<connection, &connection::rekey_cb > (this);
		1453	keepalive .set<connection, &connection::keepalive_cb > (this);
		1454	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1455
		1456	last_establish_attempt = 0.;
1242	octx = ictx = 0;	1457	octx = ictx = 0;
1243	retry_cnt = 0;
1244		1458
1245	if (!conf->protocols) // make sure some protocol is enabled	1459	connectmode = conf->connectmode;
1246	conf->protocols = PROT_UDPv4;
1247		1460
1248	connectmode = conf_node::C_ALWAYS; // initial setting	1461	// queue a dummy packet to force an initial connection attempt
		1462	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1463	vpn_queue.put (new net_packet);
		1464
1249	reset_connection ();	1465	reset_connection ("startup");
1250	}	1466	}
1251		1467
1252	connection::~connection ()	1468	connection::~connection ()
1253	{	1469	{
1254	shutdown ();	1470	shutdown ();
1255	}	1471	}
1256		1472
		1473	void
1257	void connection_init ()	1474	connection_init ()
1258	{	1475	{
1259	auth_rate_limiter.clear ();	1476	auth_rate_limiter.clear ();
1260	reset_rate_limiter.clear ();	1477	reset_rate_limiter.clear ();
1261	}	1478	}
1262		1479

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