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Comparing gvpe/src/connection.C (file contents):
Revision 1.46 by pcg, Sat Mar 5 19:13:15 2005 UTC vs.
Revision 1.111 by root, Thu Jan 16 07:53:44 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 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. 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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <cassert>
25
26	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
27		37
		38	#include <openssl/opensslv.h>
28	#include <openssl/rand.h>	39	#include <openssl/rand.h>
29	#include <openssl/evp.h>	40	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
31	#include <openssl/err.h>	42	#include <openssl/err.h>
32		43
33	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
34		50
35	#include "conf.h"	51	#include "conf.h"
36	#include "slog.h"	52	#include "slog.h"
37	#include "device.h"	53	#include "device.h"
38	#include "vpn.h"	54	#include "vpn.h"
39	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
40		57
41	#include "netcompat.h"	58	#include "netcompat.h"
42		59
43	#if !HAVE_RAND_PSEUDO_BYTES
44	# define RAND_pseudo_bytes RAND_bytes
45	#endif
46
47	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
48		61
49	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
50	#define HLOG 15	63	#define HLOG 15
51	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
52	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
53	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
54		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
55	struct crypto_ctx	112	struct crypto_ctx
56	{	113	{
57	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
58	HMAC_CTX hctx;	115	HMAC_CTX hctx;
59		116
60	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);
61	~crypto_ctx ();	118	~crypto_ctx ();
62	};	119	};
63		120
64	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)
65	{	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
66	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
67	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));
68	HMAC_CTX_init (&hctx);	153	}
69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
70	}	154	}
71		155
72	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
73	{	157	{
74	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
75	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
76	}	160	}
77		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
78	static void	189	static void
79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
80	{	191	{
81	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
82		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
83	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
84	require (EVP_DigestInit (&ctx, RSA_HASH));	195	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
85	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
86	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
87	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
88	EVP_MD_CTX_cleanup (&ctx);
89	}	196	}
90		197
91	struct rsa_entry {	198	void
92	tstamp expire;	199	connection::generate_auth_data ()
93	rsaid id;
94	rsachallenge chg;
95	};
96
97	struct rsa_cache : list<rsa_entry>
98	{	200	{
99	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	if (auth_expire < ev_now ())
100
101	bool find (const rsaid &id, rsachallenge &chg)
102	{
103	for (iterator i = begin (); i != end (); ++i)
104	{
105	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
106	{
107	memcpy (&chg, &i->chg, sizeof chg);
108
109	erase (i);
110	return true;
111	}
112	}
113
114	if (cleaner.at < NOW)
115	cleaner.start (NOW + RSA_TTL);
116
117	return false;
118	}
119
120	void gen (rsaid &id, rsachallenge &chg)
121	{
122	rsa_entry e;
123
124	RAND_bytes ((unsigned char *)&id, sizeof id);
125	RAND_bytes ((unsigned char *)&chg, sizeof chg);
126
127	e.expire = NOW + RSA_TTL;
128	e.id = id;
129	memcpy (&e.chg, &chg, sizeof chg);
130
131	push_back (e);
132
133	if (cleaner.at < NOW)
134	cleaner.start (NOW + RSA_TTL);
135	}
136
137	rsa_cache ()
138	: cleaner (this, &rsa_cache::cleaner_cb)
139	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
140		206
141	} rsa_cache;	207	// eventual response data
142		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
143	void rsa_cache::cleaner_cb (time_watcher &w)
144	{
145	if (!empty ())
146	{	209	}
147	w.start (NOW + RSA_TTL);
148		210
149	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
150	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
151	i = erase (i);
152	else
153	++i;
154	}
155	}	213	}
156		214
157	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
158		216
159	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)
160	{	219	{
161	if (queue[i])	220	queue = new pkt [max_queue];
162	{
163	delete queue[i];
164	j = (j + 1) % QUEUEDEPTH;
165	}
166		221
167	queue[i] = p;
168
169	i = (i + 1) % QUEUEDEPTH;
170	}
171
172	net_packet *pkt_queue::get ()
173	{
174	net_packet *p = queue[j];
175
176	if (p)
177	{
178	queue[j] = 0;
179	j = (j + 1) % QUEUEDEPTH;
180	}
181
182	return p;
183	}
184
185	pkt_queue::pkt_queue ()
186	{
187	memset (queue, 0, sizeof (queue));
188	i = 0;	222	i = 0;
189	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190	}	226	}
191		227
192	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
193	{	229	{
194	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
195	delete queue[i];	233	delete [] queue;
196	}	234	}
197		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
198	struct net_rateinfo {	292	struct net_rateinfo
		293	{
199	u32 host;	294	u32 host;
200	double pcnt, diff;	295	double pcnt, diff;
201	tstamp last;	296	tstamp last;
202	};	297	};
203		298
…		…
213		308
214	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	310	bool can (u32 host);
216	};	311	};
217		312
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		314
		315	bool
220	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
221	{	317	{
222	iterator i;	318	iterator i;
223		319
224	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
225	if (i->host == host)	321	if (i->host == host)
226	break;	322	break;
227	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
228	i = erase (i);	324	i = erase (i);
229	else	325	else
230	i++;	326	i++;
231		327
232	if (i == end ())	328	if (i == end ())
…		…
234	net_rateinfo ri;	330	net_rateinfo ri;
235		331
236	ri.host = host;	332	ri.host = host;
237	ri.pcnt = 1.;	333	ri.pcnt = 1.;
238	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
239	ri.last = NOW;	335	ri.last = ev_now ();
240		336
241	push_front (ri);	337	push_front (ri);
242		338
243	return true;	339	return true;
244	}	340	}
…		…
246	{	342	{
247	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
248	erase (i);	344	erase (i);
249		345
250	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252		348
253	ri.last = NOW;	349	ri.last = ev_now ();
254		350
255	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
256		352
257	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
258		354
…		…
270	}	366	}
271	}	367	}
272		368
273	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
274		370
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	373	{
279	unsigned int xlen;
280
281	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
282		375
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
285	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	379	}
288		380
289	void	381	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	383	{
292	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		385	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	387	}
296		388
297	bool	389	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	391	{
300	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		393	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	395	}
304		396
		397	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	399	{
307	type = type_;	400	type = type_;
308		401
309	int src = THISNODE->id;	402	int src = THISNODE->id;
310		403
…		…
315		408
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)	410	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		411
319	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
320	{	421	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno
322
323	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324	tap_packet *unpack (connection *conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	422	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	423	}
		424	};
332		425
333	void	426	void
334	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)
335	{	428	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	429	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	431	ptype type = PT_DATA_UNCOMPRESSED;
339		432
340	#if ENABLE_COMPRESSION	433	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	434	u8 cdata[MAX_MTU];
342		435
343	if (conn->features & ENABLE_COMPRESSION)	436	if (conn->features & FEATURE_COMPRESSION)
344	{	437	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	438	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		439
347	if (cl)	440	if (cl)
348	{	441	{
…		…
354	d[1] = cl;	447	d[1] = cl;
355	}	448	}
356	}	449	}
357	#endif	450	#endif
358		451
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	452	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
360		453
361	struct {	454	struct {
362	#if RAND_SIZE	455	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];	456	u8 rnd[RAND_SIZE];
364	#endif	457	#endif
365	u32 seqno;	458	u32 seqno;
366	} datahdr;	459	} datahdr;
367		460
368	datahdr.seqno = ntohl (seqno);	461	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE	462	#if RAND_SIZE
370	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);
371	#endif	466	#endif
372		467
373	require (EVP_EncryptUpdate (cctx,	468	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	469	(unsigned char *) data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	470	(unsigned char *) &datahdr, DATAHDR));
…		…
397	int outl = 0, outl2;	492	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	493	tap_packet *p = new tap_packet;
399	u8 *d;	494	u8 *d;
400	u32 l = len - data_hdr_size ();	495	u32 l = len - data_hdr_size ();
401		496
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
403		498
404	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
406		501
407	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	503	d = cdata;
409	else	504	else
410	#endif	505	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6] - DATAHDR;
412		507
413	/* 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
414	require (EVP_DecryptUpdate (cctx,	515	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	516	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	517	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	518	outl += outl2;
418		519
…		…
449	}	550	}
450	};	551	};
451		552
452	struct config_packet : vpn_packet	553	struct config_packet : vpn_packet
453	{	554	{
454	// actually, hmaclen cannot be checked because the hmac	555	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	556	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	557	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	558	u32 cipher_nid, mac_nid, auth_nid;
460		559
461	void setup (ptype type, int dst);	560	void setup (ptype type, int dst);
462	bool chk_config () const;	561	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		562
464	static u8 get_features ()	563	static u8 get_features ()
465	{	564	{
466	u8 f = 0;	565	u8 f = 0;
467	#if ENABLE_COMPRESSION	566	#if ENABLE_COMPRESSION
468	f |= FEATURE_COMPRESSION;	567	f |= FEATURE_COMPRESSION;
469	#endif	568	#endif
470	#if ENABLE_ROHC	569	#if ENABLE_ROHC
471	f |= FEATURE_ROHC;	570	f |= FEATURE_ROHC;
472	#endif	571	#endif
		572	#if ENABLE_BRIDGING
		573	f |= FEATURE_BRIDGING;
		574	#endif
473	return f;	575	return f;
474	}	576	}
475	};	577	};
476		578
		579	void
477	void config_packet::setup (ptype type, int dst)	580	config_packet::setup (ptype type, int dst)
478	{	581	{
479	prot_major = PROTOCOL_MAJOR;	582	prot_major = PROTOCOL_MAJOR;
480	prot_minor = PROTOCOL_MINOR;	583	prot_minor = PROTOCOL_MINOR;
481	randsize = RAND_SIZE;	584	randsize = RAND_SIZE;
482	hmaclen = HMACLENGTH;	585	flags = 0;
483	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
484	challengelen = sizeof (rsachallenge);
485	features = get_features ();	586	features = get_features ();
486		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	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 ()));
490		593
491	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	595	set_hdr (type, dst);
493	}	596	}
494		597
495	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
496	{	600	{
497	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
498	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);
499	else if (randsize != RAND_SIZE)	604	else if (randsize != RAND_SIZE)
500	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)"),
501	else if (hmaclen != HMACLENGTH)	606	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503	#if 0 // this implementation should handle all flag settings
504	else if (flags != curflags ())
505	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
506	#endif
507	else if (challengelen != sizeof (rsachallenge))
508	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
509	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
510	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)"),
511	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
512	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
513	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	610	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
514	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 ()));
515	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)
516	return true;	624	return true;
		625	}
517		626
518	return false;	627	return false;
519	}	628	}
520		629
521	struct auth_req_packet : config_packet	630	struct auth_req_packet : config_packet // UNPROTECTED
522	{	631	{
523	char magic[8];	632	char magic[8];
524	u8 initiate; // false if this is just an automatic reply	633	u8 initiate; // false if this is just an automatic reply
525	u8 protocols; // supported protocols (will be patched on forward)	634	u8 protocols; // supported protocols (will be patched on forward)
526	u8 pad2, pad3;	635	u8 pad2, pad3;
527	rsaid id;	636	auth_encr encr;
528	rsaencrdata encr;
529		637
530	auth_req_packet (int dst, bool initiate_, u8 protocols_)	638	auth_req_packet (int dst, bool initiate_, u8 protocols_)
531	{	639	{
532	config_packet::setup (PT_AUTH_REQ, dst);	640	config_packet::setup (PT_AUTH_REQ, dst);
533	strncpy (magic, MAGIC, 8);	641	memcpy (magic, MAGIC, 8);
534	initiate = !!initiate_;	642	initiate = !!initiate_;
535	protocols = protocols_;	643	protocols = protocols_;
536		644
537	len = sizeof (*this) - sizeof (net_packet);	645	len = sizeof (*this) - sizeof (net_packet);
538	}	646	}
539	};	647	};
540		648
541	struct auth_res_packet : config_packet	649	struct auth_res_packet : vpn_packet // UNPROTECTED
542	{	650	{
543	rsaid id;
544	u8 pad1, pad2, pad3;
545	u8 response_len; // encrypted length
546	rsaresponse response;	651	auth_response response;
547		652
548	auth_res_packet (int dst)	653	auth_res_packet (int dst)
549	{	654	{
550	config_packet::setup (PT_AUTH_RES, dst);	655	set_hdr (PT_AUTH_RES, dst);
551		656
552	len = sizeof (*this) - sizeof (net_packet);	657	len = sizeof (*this) - sizeof (net_packet);
553	}	658	}
554	};	659	};
555		660
…		…
585	};	690	};
586		691
587	/////////////////////////////////////////////////////////////////////////////	692	/////////////////////////////////////////////////////////////////////////////
588		693
589	void	694	void
590	connection::connection_established ()	695	connection::connection_established (const sockinfo &rsi)
591	{	696	{
592	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."));
593	{	713	}
594	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);
595		717
		718	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		719	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		720
		721	oiv.reset ();
		722
596	// make sure rekeying timeouts are slightly asymmetric	723	// make sure rekeying timeouts are slightly asymmetric
597	rekey.start (NOW + ::conf.rekey	724	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
598	+ (conf->id > THISNODE->id ? 10 : 0));	725	rekey.start (rekey_interval, rekey_interval);
		726
		727	hmac_error = 0.;
		728
599	keepalive.start (NOW + ::conf.keepalive);	729	keepalive.start (::conf.keepalive);
600		730
601	// send queued packets	731	// send queued packets
602	if (ictx && octx)
603	{
604	while (tap_packet *p = (tap_packet *)data_queue.get ())	732	while (tap_packet *p = (tap_packet *)data_queue.get ())
605	{	733	{
606	send_data_packet (p);	734	if (p->len) send_data_packet (p);
607	delete p;	735	delete p;
608	}	736	}
609		737
610	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	738	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
611	{	739	{
612	send_vpn_packet (p, si, IPTOS_RELIABILITY);	740	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
613	delete p;	741	delete p;
614	}
615	}
616	}	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 ());
617	else	752	else
618	{	753	{
619	retry_cnt = 0;	754	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
620	establish_connection.start (NOW + 5);	755	protocol = 0;
621	keepalive.stop ();
622	rekey.stop ();
623	}	756	}
624	}
625
626	void
627	connection::reset_si ()
628	{
629	protocol = best_protocol (THISNODE->protocols & conf->protocols);
630
631	// mask out protocols we cannot establish
632	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
633	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
634	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
635		757
636	si.set (conf, protocol);	758	si.set (conf, protocol);
637	}	759	}
638		760
639	// ensure sockinfo is valid, forward if necessary	761	// ensure sockinfo is valid, forward if necessary
640	const sockinfo &	762	const sockinfo &
641	connection::forward_si (const sockinfo &si) const	763	connection::forward_si (const sockinfo &si) const
642	{	764	{
643	if (!si.valid ())	765	if (!si.valid ())
644	{	766	{
645	connection *r = vpn->find_router ();	767	connection *r = vpn->find_router_for (this);
646		768
647	if (r)	769	if (r)
648	{	770	{
649	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	771	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
650	conf->nodename, r->conf->nodename, (const char *)r->si);	772	conf->nodename, r->conf->nodename);
651	return r->si;	773	return r->si;
652	}	774	}
653	else	775	else
654	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	776	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
655	conf->nodename);	777	conf->nodename);
656	}	778	}
657		779
658	return si;	780	return si;
659	}	781	}
660		782
661	void	783	void
662	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)
663	{	785	{
664	if (!vpn->send_vpn_packet (pkt, si, tos))	786	if (!vpn->send_vpn_packet (pkt, si, tos))
665	reset_connection ();	787	reset_connection ("packet send error");
666	}	788	}
667		789
668	void	790	void
669	connection::send_ping (const sockinfo &si, u8 pong)	791	connection::send_ping (const sockinfo &si, u8 pong)
670	{	792	{
671	ping_packet *pkt = new ping_packet;	793	ping_packet *pkt = new ping_packet;
672		794
673	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);
674	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	798	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
675		799
676	delete pkt;	800	delete pkt;
677	}	801	}
678		802
…		…
693	void	817	void
694	connection::send_auth_request (const sockinfo &si, bool initiate)	818	connection::send_auth_request (const sockinfo &si, bool initiate)
695	{	819	{
696	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);
697		821
698	rsachallenge chg;	822	generate_auth_data ();
699	rsa_cache.gen (pkt->id, chg);
700	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	823	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
701		824
702	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);
703
704	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
705		827
706	delete pkt;	828	delete pkt;
707	}	829	}
708		830
709	void	831	void
710	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	832	connection::send_auth_response (const sockinfo &si)
711	{	833	{
712	auth_res_packet *pkt = new auth_res_packet (conf->id);	834	auth_res_packet *pkt = new auth_res_packet (conf->id);
713		835
714	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);
715		838
716	rsa_hash (id, chg, pkt->response);
717
718	pkt->hmac_set (octx);
719
720	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);
721
722	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
723		841
724	delete pkt;	842	delete pkt;
725	}	843	}
726		844
727	void	845	void
728	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	846	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
729	{	847	{
730	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	848	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
731	conf->id, rid, (const char *)rsi);	849	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		850	conf->protocols);
732		851
733	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);
734		853
735	r->hmac_set (octx);	854	r->hmac_set (octx);
736	send_vpn_packet (r, si);	855	send_vpn_packet (r, si);
737		856
738	delete r;	857	delete r;
739	}	858	}
740		859
741	void	860	inline void
742	connection::establish_connection_cb (time_watcher &w)	861	connection::establish_connection_cb (ev::timer &w, int revents)
743	{	862	{
744	if (!ictx	863	if (!(ictx && octx)
745	&& conf != THISNODE	864	&& conf != THISNODE
746	&& connectmode != conf_node::C_NEVER	865	&& connectmode != conf_node::C_NEVER
747	&& connectmode != conf_node::C_DISABLED	866	&& connectmode != conf_node::C_DISABLED
748	&& NOW > w.at)	867	&& !w.is_active ())
749	{	868	{
750	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
751		870	// and stop trying. should probably be handled by a per-connection expire handler.
752	if (retry_int < conf->max_retry)	871	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		872	{
		873	reset_connection ("no demand");
753	retry_cnt++;	874	return;
754	else	875	}
755	retry_int = conf->max_retry;
756		876
757	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));
758		882
759	reset_si ();	883	reset_si ();
760		884
761	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);
762	vpn->send_connect_request (conf->id);	891	vpn->send_connect_request (this);
		892	}
763	else	893	else
764	{	894	{
		895	if (si.valid ())
		896	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		897	conf->nodename, (const char *)si);
		898
765	const sockinfo &dsi = forward_si (si);	899	const sockinfo &dsi = forward_si (si);
		900
		901	slow = slow || (dsi.prot & PROT_SLOW);
766		902
767	if (dsi.valid () && auth_rate_limiter.can (dsi))	903	if (dsi.valid () && auth_rate_limiter.can (dsi))
768	{	904	{
769	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))
770	send_auth_request (dsi, true);	909	send_auth_request (dsi, true);
771	else	910	else
772	send_ping (dsi, 0);	911	send_ping (dsi, 0);
773	}	912	}
774	}	913	}
775	}
776	}
777		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
778	void	926	void
779	connection::reset_connection ()	927	connection::reset_connection (const char *reason)
780	{	928	{
781	if (ictx && octx)	929	if (ictx && octx)
782	{	930	{
783	slog (L_INFO, _("%s(%s): connection lost"),	931	slog (L_INFO, _("%s(%s): connection lost (%s)"),
784	conf->nodename, (const char *)si);	932	conf->nodename, (const char *)si, reason);
785		933
786	if (::conf.script_node_down)	934	if (::conf.script_node_down)
787	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	}
788	}	940	}
789		941
790	delete ictx; ictx = 0;	942	delete ictx; ictx = 0;
791	delete octx; octx = 0;	943	delete octx; octx = 0;
792	#if ENABLE_DNS
793	dnsv4_reset_connection ();
794	#endif
795		944
796	si.host = 0;	945	si.host = 0;
797		946
		947	have_snd_auth = false;
		948	have_rcv_auth = false;
		949	auth_expire = 0.;
		950
798	last_activity = 0;	951	last_activity = 0.;
		952	//last_si_change = 0.;
799	retry_cnt = 0;	953	retry_cnt = 0;
800		954
801	rekey.stop ();	955	rekey.stop ();
802	keepalive.stop ();	956	keepalive.stop ();
803	establish_connection.stop ();	957	establish_connection.stop ();
…		…
807	connection::shutdown ()	961	connection::shutdown ()
808	{	962	{
809	if (ictx && octx)	963	if (ictx && octx)
810	send_reset (si);	964	send_reset (si);
811		965
812	reset_connection ();	966	reset_connection ("shutdown");
813	}	967	}
814		968
815	void	969	// poor-man's rekeying
816	connection::rekey_cb (time_watcher &w)	970	inline void
		971	connection::rekey_cb (ev::timer &w, int revents)
817	{	972	{
818	reset_connection ();	973	reset_connection ("rekeying");
819	establish_connection ();	974	establish_connection ();
820	}	975	}
821		976
822	void	977	void
823	connection::send_data_packet (tap_packet *pkt)	978	connection::send_data_packet (tap_packet *pkt)
…		…
837	if (oseqno > MAX_SEQNO)	992	if (oseqno > MAX_SEQNO)
838	rekey ();	993	rekey ();
839	}	994	}
840		995
841	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
842	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1007	connection::inject_data_packet (tap_packet *pkt)
843	{	1008	{
844	if (ictx && octx)	1009	if (ictx && octx)
845	send_data_packet (pkt);	1010	send_data_packet (pkt);
846	else	1011	else
847	{	1012	{
848	if (!broadcast)//DDDD
849	data_queue.put (new tap_packet (*pkt));	1013	data_queue.put (new tap_packet (*pkt));
850		1014	post_inject_queue ();
851	establish_connection ();
852	}	1015	}
853	}	1016	}
854		1017
		1018	void
855	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1019	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
856	{	1020	{
857	if (ictx && octx)	1021	if (ictx && octx)
858	send_vpn_packet (pkt, si, tos);	1022	send_vpn_packet (pkt, si, tos);
859	else	1023	else
860	{	1024	{
861	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1025	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
862		1026	post_inject_queue ();
863	establish_connection ();
864	}	1027	}
865	}	1028	}
866		1029
867	void	1030	void
868	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1031	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
869	{	1032	{
870	last_activity = NOW;	1033	last_activity = ev_now ();
871		1034
872	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.",
873	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;
874		1040
875	switch (pkt->typ ())	1041	switch (pkt->typ ())
876	{	1042	{
877	case vpn_packet::PT_PING:	1043	case vpn_packet::PT_PING:
		1044	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1045
878	// we send pings instead of auth packets after some retries,	1046	// we send pings instead of auth packets after some retries,
879	// so reset the retry counter and establish a connection	1047	// so reset the retry counter and establish a connection
880	// when we receive a ping.	1048	// when we receive a ping.
881	if (!ictx)	1049	if (!ictx)
882	{	1050	{
883	if (auth_rate_limiter.can (rsi))	1051	if (auth_rate_limiter.can (rsi))
884	send_auth_request (rsi, true);	1052	send_auth_request (rsi, true);
885	}	1053	}
886	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.
887	send_ping (rsi, 1); // pong	1057	send_ping (rsi, 1); // pong
888		1058
889	break;	1059	break;
890		1060
891	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 ();
892	break;	1067	break;
893		1068
894	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)
895	{	1073	{
896	reset_connection ();	1074	reset_connection ("remote reset");
897		1075
898	config_packet *p = (config_packet *) pkt;	1076	config_packet *p = (config_packet *) pkt;
899		1077
900	if (!p->chk_config ())	1078	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
901	{
902	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
903	conf->nodename, (const char *)rsi);
904	connectmode = conf_node::C_DISABLED;
905	}
906	else if (connectmode == conf_node::C_ALWAYS)
907	establish_connection ();	1079	establish_connection ();
908	}	1080	}
		1081
909	break;	1082	break;
910		1083
911	case vpn_packet::PT_AUTH_REQ:	1084	case vpn_packet::PT_AUTH_REQ:
912	if (auth_rate_limiter.can (rsi))	1085	if (auth_rate_limiter.can (rsi))
913	{	1086	{
914	auth_req_packet *p = (auth_req_packet *) pkt;	1087	auth_req_packet *p = (auth_req_packet *)pkt;
915		1088
916	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);
917		1092
918	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))
919	{	1099	{
920	if (p->prot_minor != PROTOCOL_MINOR)	1100	if (p->prot_minor != PROTOCOL_MINOR)
921	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."),
922	conf->nodename, (const char *)rsi,	1102	conf->nodename, (const char *)rsi,
923	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1103	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
924		1104
925	if (p->initiate)	1105	if (p->initiate)
		1106	{
926	send_auth_request (rsi, false);	1107	send_auth_request (rsi, false);
927		1108
928	rsachallenge k;	1109	if (ictx && octx)
		1110	reset_connection ("reconnect");
		1111	}
929		1112
		1113	auth_data auth;
		1114
930	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1115	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
931	{	1116	{
932	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?"),
933	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));
934	break;
935	}	1119	}
936	else	1120	else
937	{	1121	{
938	delete octx;	1122	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
939		1123
940	octx = new crypto_ctx (k, 1);	1124	rcv_auth = auth;
941	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1125	have_rcv_auth = true;
942		1126
943	// compatibility code, remove when no longer required	1127	send_auth_response (rsi);
944	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
945		1128
		1129	if (chg)
		1130	{
946	conf->protocols = p->protocols;	1131	conf->protocols = p->protocols;
947	features = p->features & config_packet::get_features ();	1132	features = p->features & config_packet::get_features ();
948		1133
949	send_auth_response (rsi, p->id, k);
950
951	connection_established ();	1134	connection_established (rsi);
952
953	break;	1135	}
954	}	1136	}
		1137
		1138	break;
955	}	1139	}
956	else
957	slog (L_WARN, _("%s(%s): protocol mismatch"),
958	conf->nodename, (const char *)rsi);
959		1140
960	send_reset (rsi);	1141	send_reset (rsi);
961	}	1142	}
962		1143
963	break;	1144	break;
964		1145
965	case vpn_packet::PT_AUTH_RES:	1146	case vpn_packet::PT_AUTH_RES:
966	{	1147	{
967	auth_res_packet *p = (auth_res_packet *) pkt;	1148	auth_res_packet *p = (auth_res_packet *)pkt;
968		1149
969	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1150	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
970		1151
971	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))
972	{	1156	{
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"),	1157	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
983	conf->nodename, (const char *)rsi);	1158	conf->nodename, (const char *)rsi);
984	break;
985	}	1159	}
986	else	1160	else if (!have_snd_auth)
987	{	1161	{
988	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1162	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
989		1163
990	if (!p->hmac_chk (cctx))	1164	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 ();	1165	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	run_script (run_script_cb (this, &connection::script_node_up), false);
1022
1023	break;
1024	}
1025	else
1026	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1027	conf->nodename, (const char *)rsi);
1028	}
1029
1030	delete cctx;
1031	}
1032	}	1166	}
1033	}	1167	}
1034
1035	send_reset (rsi);
1036	break;	1168	break;
1037		1169
1038	case vpn_packet::PT_DATA_COMPRESSED:	1170	case vpn_packet::PT_DATA_COMPRESSED:
1039	#if !ENABLE_COMPRESSION	1171	#if !ENABLE_COMPRESSION
1040	send_reset (rsi);	1172	send_reset (rsi);
…		…
1046	if (ictx && octx)	1178	if (ictx && octx)
1047	{	1179	{
1048	vpndata_packet *p = (vpndata_packet *)pkt;	1180	vpndata_packet *p = (vpndata_packet *)pkt;
1049		1181
1050	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	{
1051	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"
1052	"could be an attack, or just corruption or a synchronization error"),	1198	"could be an attack, or just corruption or a synchronization error."),
1053	conf->nodename, (const char *)rsi);	1199	conf->nodename, (const char *)rsi);
		1200	// reset
		1201	}
		1202	}
1054	else	1203	else
1055	{	1204	{
1056	u32 seqno;	1205	u32 seqno;
1057	tap_packet *d = p->unpack (this, seqno);	1206	tap_packet *d = p->unpack (this, seqno);
		1207	int seqclass = iseqno.seqno_classify (seqno);
1058		1208
1059	if (iseqno.recv_ok (seqno))	1209	hmac_error = 0;
		1210
		1211	if (seqclass == 0) // ok
1060	{	1212	{
1061	vpn->tap->send (d);	1213	vpn->tap->send (d);
1062		1214
1063	if (si != rsi)	1215	if (si != rsi)
1064	{	1216	{
1065	// 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.)
1066	si = rsi;	1219	// {
1067
1068	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1220	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1069	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);
1070	}	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);
1071	}	1249	}
1072		1250
1073	delete d;	1251	delete d;
1074	break;	1252	break;
1075	}	1253	}
…		…
1079	break;	1257	break;
1080		1258
1081	case vpn_packet::PT_CONNECT_REQ:	1259	case vpn_packet::PT_CONNECT_REQ:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1260	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1261	{
1084	connect_req_packet *p = (connect_req_packet *) pkt;	1262	connect_req_packet *p = (connect_req_packet *)pkt;
1085		1263
1086	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 ())
1087	connection *c = vpn->conns[p->id - 1];
1088	conf->protocols = p->protocols;
1089
1090	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1091	conf->id, p->id, c->ictx && c->octx);
1092
1093	if (c->ictx && c->octx)
1094	{	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	{
1095	// send connect_info packets to both sides, in case one is	1276	// send connect_info packets to both sides, in case one is
1096	// behind a nat firewall (or both ;)	1277	// behind a nat firewall (or both ;)
1097	c->send_connect_info (conf->id, si, conf->protocols);	1278	c->send_connect_info (conf->id, si, conf->protocols);
1098	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 ();
1099	}	1283	}
1100	else	1284	else
1101	c->establish_connection ();	1285	slog (L_WARN,
		1286	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1287	p->id);
1102	}	1288	}
1103		1289
1104	break;	1290	break;
1105		1291
1106	case vpn_packet::PT_CONNECT_INFO:	1292	case vpn_packet::PT_CONNECT_INFO:
1107	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1293	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1108	{	1294	{
1109	connect_info_packet *p = (connect_info_packet *)pkt;	1295	connect_info_packet *p = (connect_info_packet *)pkt;
1110		1296
1111	if (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 ())
1112	{	1298	{
1113	connection *c = vpn->conns[p->id - 1];	1299	connection *c = vpn->conns[p->id - 1];
1114		1300
1115	c->conf->protocols = p->protocols;	1301	c->conf->protocols = p->protocols;
1116	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));
1117	p->si.upgrade_protocol (protocol, c->conf);	1303	p->si.upgrade_protocol (protocol, c->conf);
1118		1304
1119	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]",
1120	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);
1121		1313
1122	const sockinfo &dsi = forward_si (p->si);	1314	const sockinfo &dsi = forward_si (p->si);
1123		1315
1124	if (dsi.valid ())	1316	if (dsi.valid ())
1125	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);
1126	}	1322	}
		1323	else
		1324	slog (L_WARN,
		1325	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1326	p->id);
1127	}	1327	}
1128		1328
1129	break;	1329	break;
1130		1330
1131	default:	1331	default:
1132	send_reset (rsi);	1332	send_reset (rsi);
1133	break;	1333	break;
1134	}	1334	}
1135	}	1335	}
1136		1336
1137	void connection::keepalive_cb (time_watcher &w)	1337	inline void
		1338	connection::keepalive_cb (ev::timer &w, int revents)
1138	{	1339	{
1139	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)
1140	{	1345	{
1141	reset_connection ();	1346	reset_connection ("keepalive overdue");
1142	establish_connection ();	1347	establish_connection ();
1143	}	1348	}
1144	else if (NOW < last_activity + ::conf.keepalive)
1145	w.start (last_activity + ::conf.keepalive);
1146	else if (conf->connectmode != conf_node::C_ONDEMAND	1349	else if (conf->connectmode != conf_node::C_ONDEMAND
1147	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1350	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1148	{	1351	{
		1352	w.start (3);
1149	send_ping (si);	1353	send_ping (si);
1150	w.start (NOW + 5);
1151	}	1354	}
1152	else if (NOW < last_activity + ::conf.keepalive + 10)	1355	else if (when >= -10)
1153	// hold ondemand connections implicitly a few seconds longer	1356	// hold ondemand connections implicitly a few seconds longer
1154	// should delete octx, though, or something like that ;)	1357	// should delete octx, though, or something like that ;)
1155	w.start (last_activity + ::conf.keepalive + 10);	1358	w.start (when + 10);
1156	else	1359	else
1157	reset_connection ();	1360	reset_connection ("keepalive timeout");
1158	}	1361	}
1159		1362
		1363	void
1160	void connection::send_connect_request (int id)	1364	connection::send_connect_request (int id)
1161	{	1365	{
1162	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);
1163		1367
1164	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);
1165	p->hmac_set (octx);	1371	p->hmac_set (octx);
1166	send_vpn_packet (p, si);	1372	send_vpn_packet (p, si);
1167		1373
1168	delete p;	1374	delete p;
1169	}	1375	}
1170		1376
1171	void connection::script_node ()	1377	void
		1378	connection::script_init_env (const char *ext)
1172	{	1379	{
1173	vpn->script_if_up ();
1174
1175	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;
1176	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);
1177	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1396	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1178	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1397	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1179	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1398	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1180	}	1399	}
1181		1400
		1401	inline const char *
1182	const char *connection::script_node_up ()	1402	connection::script_node_up ()
1183	{	1403	{
1184	script_node ();	1404	script_init_connect_env ();
1185		1405
1186	putenv ("STATE=up");	1406	putenv ((char *)"STATE=up");
1187		1407
		1408	char *filename;
		1409	asprintf (&filename,
		1410	"%s/%s",
		1411	confbase,
1188	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1412	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1189	}
1190		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 *
1191	const char *connection::script_node_down ()	1434	connection::script_node_down ()
1192	{	1435	{
1193	script_node ();	1436	script_init_connect_env ();
1194		1437
1195	putenv ("STATE=down");	1438	putenv ((char *)"STATE=down");
1196		1439
1197	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1440	char *filename;
		1441	asprintf (&filename,
		1442	"%s/%s",
		1443	confbase,
		1444	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1445
		1446	return filename;
1198	}	1447	}
1199		1448
1200	connection::connection (struct vpn *vpn, conf_node *conf)	1449	connection::connection (struct vpn *vpn, conf_node *conf)
1201	: vpn(vpn), conf(conf)	1450	: vpn(vpn), conf(conf),
1202	, rekey (this, &connection::rekey_cb)
1203	, keepalive (this, &connection::keepalive_cb)
1204	, establish_connection (this, &connection::establish_connection_cb)
1205	#if ENABLE_DNS	1451	#if ENABLE_DNS
1206	, dns (0)	1452	dns (0),
1207	#endif	1453	#endif
		1454	data_queue(conf->max_ttl, conf->max_queue + 1),
		1455	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1208	{	1456	{
		1457	rekey .set<connection, &connection::rekey_cb > (this);
		1458	keepalive .set<connection, &connection::keepalive_cb > (this);
		1459	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1460
		1461	last_establish_attempt = 0.;
1209	octx = ictx = 0;	1462	octx = ictx = 0;
1210	retry_cnt = 0;
1211		1463
1212	if (!conf->protocols) // make sure some protocol is enabled	1464	connectmode = conf->connectmode;
1213	conf->protocols = PROT_UDPv4;
1214		1465
1215	connectmode = conf_node::C_ALWAYS; // initial setting	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
1216	reset_connection ();	1470	reset_connection ("startup");
1217	}	1471	}
1218		1472
1219	connection::~connection ()	1473	connection::~connection ()
1220	{	1474	{
1221	shutdown ();	1475	shutdown ();
1222	}	1476	}
1223		1477
		1478	void
1224	void connection_init ()	1479	connection_init ()
1225	{	1480	{
1226	auth_rate_limiter.clear ();	1481	auth_rate_limiter.clear ();
1227	reset_rate_limiter.clear ();	1482	reset_rate_limiter.clear ();
1228	}	1483	}
1229		1484

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