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Comparing gvpe/src/connection.C (file contents):
Revision 1.10 by pcg, Sun Apr 6 18:12:18 2003 UTC vs.
Revision 1.106 by root, Fri Jul 19 21:01:16 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb *cb, const char *warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
57	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	146	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	147	}
62		148
63	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
64	{	150	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
67	}	153	}
68		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	189	}
81		190
82	struct rsa_entry {	191	void
83	tstamp expire;	192	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	193	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		199
132	} rsa_cache;	200	// eventual response data
133		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	202	}
140	w.at = NOW + RSA_TTL;
141		203
142	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
143	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	206	}
149		207
150	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
151		209
152	void pkt_queue::put (tap_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
153	{	212	{
154	if (queue[i])	213	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		214
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	215	i = 0;
182	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	219	}
184		220
185	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
186	{	222	{
187	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
188	delete queue[i];	226	delete [] queue;
189	}	227	}
190		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
191	struct net_rateinfo {	285	struct net_rateinfo
		286	{
192	u32 host;	287	u32 host;
193	double pcnt, diff;	288	double pcnt, diff;
194	tstamp last;	289	tstamp last;
195	};	290	};
196		291
197	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	294	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
201	{	296	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		301
207	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	303	bool can (u32 host);
209	};	304	};
210		305
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		307
		308	bool
213	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
214	{	310	{
215	iterator i;	311	iterator i;
216		312
217	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
218	if (i->host == host)	314	if (i->host == host)
219	break;	315	break;
220	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	317	i = erase (i);
222	else	318	else
223	i++;	319	i++;
224		320
225	if (i == end ())	321	if (i == end ())
226	{	322	{
227	net_rateinfo ri;	323	net_rateinfo ri;
228		324
229	ri.host = host;	325	ri.host = host;
230	ri.pcnt = 1.;	326	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	327	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	328	ri.last = ev_now ();
233		329
234	push_front (ri);	330	push_front (ri);
235		331
236	return true;	332	return true;
237	}	333	}
238	else	334	else
239	{	335	{
240	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
241	erase (i);	337	erase (i);
242		338
243	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		341
246	ri.last = NOW;	342	ri.last = ev_now ();
247		343
248	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
249		345
250	bool send = dif > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
251		347
252	if (dif > MAXDIF)	348	if (dif > NRL_MAXDIF)
253	{	349	{
254	ri.pcnt = 1.;	350	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	351	ri.diff = NRL_MAXDIF;
256	}	352	}
257	else if (send)	353	else if (send)
258	ri.pcnt++;	354	ri.pcnt++;
259		355
260	push_front (ri);	356	push_front (ri);
…		…
263	}	359	}
264	}	360	}
265		361
266	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
267		363
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
269
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
271	{	366	{
272	unsigned int xlen;
273
274	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
275		368
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
278	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
280	}	372	}
281		373
282	void	374	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	376	{
285	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		378	hmac_gen (ctx, hmac_digest);
287	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
288	}	380	}
289		381
290	bool	382	bool
291	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
292	{	384	{
293	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
294		386	hmac_gen (ctx, hmac_digest);
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	388	}
297		389
		390	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	392	{
300	type = type_;	393	type = type_;
301		394
302	int src = THISNODE->id;	395	int src = THISNODE->id;
303		396
…		…
307	}	400	}
308		401
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		404
312	struct vpndata_packet:vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		410	tap_packet *unpack (connection *conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
313	{	414	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315
316	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
317	tap_packet *unpack (connection *conn, u32 &seqno);
318	private:
319
320	const u32 data_hdr_size () const
321	{
322	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	416	}
		417	};
325		418
326	void	419	void
327	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
328	{	421	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	423	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
332		425
333	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
335	u32 cl;
336		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
338	if (cl)	433	if (cl)
339	{	434	{
340	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
341	d = cdata;	436	d = cdata;
342	l = cl + 2;	437	l = cl + 2;
343		438
344	d[0] = cl >> 8;	439	d[0] = cl >> 8;
345	d[1] = cl;	440	d[1] = cl;
		441	}
346	}	442	}
347	#endif	443	#endif
348		444
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		446
351	struct {	447	struct {
352	#if RAND_SIZE	448	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
354	#endif	450	#endif
355	u32 seqno;	451	u32 seqno;
356	} datahdr;	452	} datahdr;
357		453
358	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	455	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
361	#endif	459	#endif
362		460
363	EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	463	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	464	outl += outl2;
367		465
368	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	468	(unsigned char *) d, l));
371	outl += outl2;	469	outl += outl2;
372		470
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	471	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	472	outl += outl2;
375		473
376	len = outl + data_hdr_size ();	474	len = outl + data_hdr_size ();
377		475
378	set_hdr (type, dst);	476	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	485	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
389	u8 *d;	487	u8 *d;
390	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
391		489
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		491
394	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
396		494
397	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	496	d = cdata;
399	else	497	else
400	#endif	498	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
402		500
403	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	509	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	510	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	511	outl += outl2;
408		512
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	514	outl += outl2;
411		515
412	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	516	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
413		517
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	543	}
440	};	544	};
441		545
442	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
443	{	547	{
444	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
450		552
451	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
452	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f |= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f |= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
453	return 0x80	568	return f;
454	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	569	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	570	};
460		571
		572	void
461	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
462	{	574	{
463	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	578	flags = 0;
467	flags = curflags ();	579	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
473		586
474	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	588	set_hdr (type, dst);
476	}	589	}
477		590
478	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	593	{
480	return prot_major == PROTOCOL_MAJOR	594	if (prot_major != PROTOCOL_MAJOR)
481	&& randsize == RAND_SIZE	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
482	&& hmaclen == HMACLENGTH	596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
483	&& flags == curflags ()	597	else if (randsize != RAND_SIZE)
484	&& challengelen == sizeof (rsachallenge)	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
485	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
486	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
487	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
488	}	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
489		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
		617	return true;
		618	}
		619
		620	return false;
		621	}
		622
490	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
491	{	624	{
492	char magic[8];	625	char magic[8];
493	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
494	u8 protocols; // supported protocols (will get patches on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
495	u8 pad2, pad3;	628	u8 pad2, pad3;
496	rsaid id;	629	auth_encr encr;
497	rsaencrdata encr;
498		630
499	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
500	{	632	{
501	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
502	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
503	initiate = !!initiate_;	635	initiate = !!initiate_;
504	protocols = protocols_;	636	protocols = protocols_;
505		637
506	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
507	}	639	}
508	};	640	};
509		641
510	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
511	{	643	{
512	rsaid id;
513	u8 pad1, pad2, pad3;
514	u8 response_len; // encrypted length
515	rsaresponse response;	644	auth_response response;
516		645
517	auth_res_packet (int dst)	646	auth_res_packet (int dst)
518	{	647	{
519	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
520		649
521	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
522	}	651	}
523	};	652	};
524		653
…		…
554	};	683	};
555		684
556	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
557		686
558	void	687	void
559	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
560	{	689	{
		690	if (!have_snd_auth || !have_rcv_auth)
		691	return;
		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
561	if (ictx && octx)	723	if (ictx && octx)
562	{	724	{
563	connectmode = conf->connectmode;
564
565	rekey.start (NOW + ::conf.rekey);
566	keepalive.start (NOW + ::conf.keepalive);
567
568	// send queued packets
569	if (ictx && octx)
570	while (tap_packet *p = queue.get ())	725	while (tap_packet *p = (tap_packet *)data_queue.get ())
571	{	726	{
572	send_data_packet (p);	727	if (p->len) send_data_packet (p);
573	delete p;	728	delete p;
574	}	729	}
		730
		731	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
575	}	736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
		742	connection::reset_si ()
		743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
576	else	746	else
577	{	747	{
578	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
579	establish_connection.start (NOW + 5);	749	protocol = 0;
580	keepalive.reset ();
581	rekey.reset ();
582	}	750	}
583	}
584
585	void
586	connection::reset_si ()
587	{
588	protocol = best_protocol (THISNODE->protocols & conf->protocols);
589
590	// mask out protocols we cannot establish
591	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
592	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
593		751
594	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
595	}	755	}
596		756
597	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
598	const sockinfo &	758	const sockinfo &
599	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
600	{	760	{
601	if (!si.valid ())	761	if (!si.valid ())
602	{	762	{
603	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
604		764
605	if (r)	765	if (r)
606	{	766	{
607	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
608	conf->nodename, r->conf->nodename);	768	conf->nodename, r->conf->nodename);
609	return r->si;	769	return r->si;
610	}	770	}
611	else	771	else
612	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
613	conf->nodename);	773	conf->nodename);
614	}	774	}
615		775
616	return si;	776	return si;
617	}	777	}
…		…
627	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
628	{	788	{
629	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
630		790
631	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
632	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
633		795
634	delete pkt;	796	delete pkt;
635	}	797	}
636		798
…		…
651	void	813	void
652	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
653	{	815	{
654	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
655		817
656	rsachallenge chg;	818	generate_auth_data ();
		819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
657		820
658	rsa_cache.gen (pkt->id, chg);
659
660	if (0 > RSA_public_encrypt (sizeof chg,
661	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
662	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
663	fatal ("RSA_public_encrypt error");
664
665	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	821	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
666
667	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
668		823
669	delete pkt;	824	delete pkt;
670	}	825	}
671		826
672	void	827	void
673	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
674	{	829	{
675	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
676		831
677	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
678		834
679	rsa_hash (id, chg, pkt->response);
680
681	pkt->hmac_set (octx);
682
683	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
684
685	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
686		837
687	delete pkt;	838	delete pkt;
688	}	839	}
689		840
690	void	841	void
691	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
692	{	843	{
693	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
694	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
695		847
696	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
697		849
698	r->hmac_set (octx);	850	r->hmac_set (octx);
699	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
700		852
701	delete r;	853	delete r;
702	}	854	}
703		855
704	void	856	inline void
705	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
706	{	858	{
707	if (ictx || conf == THISNODE	859	if (!(ictx && octx)
		860	&& conf != THISNODE
708	|| connectmode == conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
709	|| connectmode == conf_node::C_DISABLED)	862	&& connectmode != conf_node::C_DISABLED
710	w.at = TSTAMP_CANCEL;	863	&& !w.is_active ())
711	else if (w.at <= NOW)
712	{	864	{
713	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
714		866	// and stop trying. should probably be handled by a per-connection expire handler.
715	if (retry_int < 3600 * 8)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
716	retry_cnt++;	870	return;
		871	}
717		872
718	w.at = NOW + retry_int;	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		876	? (retry_cnt & 3) + 1
		877	: 1 << (retry_cnt >> 2));
719		878
720	reset_si ();	879	reset_si ();
721		880
722	if (si.prot && !si.host)	881	bool slow = si.prot & PROT_SLOW;
		882
		883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/*TODO*/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
723	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
724	else	889	else
725	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
726	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow || (dsi.prot & PROT_SLOW);
727		898
728	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
729	{	900	{
730	if (retry_cnt < 4)	901	if (retry_cnt < 4)
731	send_auth_request (dsi, true);	902	send_auth_request (dsi, true);
732	else	903	else
733	send_ping (dsi, 0);	904	send_ping (dsi, 0);
734	}	905	}
735	}	906	}
		907
		908	retry_int *= slow ? 8. : 0.9;
		909
		910	if (retry_int < conf->max_retry)
		911	retry_cnt++;
		912	else
		913	retry_int = conf->max_retry;
		914
		915	w.start (retry_int);
736	}	916	}
737	}	917	}
738		918
739	void	919	void
740	connection::reset_connection ()	920	connection::reset_connection ()
…		…
743	{	923	{
744	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
745	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
746		926
747	if (::conf.script_node_down)	927	if (::conf.script_node_down)
748	run_script (run_script_cb (this, &connection::script_node_down), false);	928	{
		929	run_script_cb *cb = new run_script_cb;
		930	cb->set<connection, &connection::script_node_down> (this);
		931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
749	}	933	}
750		934
751	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
752	delete octx; octx = 0;	936	delete octx; octx = 0;
753		937
754	si.host= 0;	938	si.host = 0;
755		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
756	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
757	retry_cnt = 0;	946	retry_cnt = 0;
758		947
759	rekey.reset ();	948	rekey.stop ();
760	keepalive.reset ();	949	keepalive.stop ();
761	establish_connection.reset ();	950	establish_connection.stop ();
762	}	951	}
763		952
764	void	953	void
765	connection::shutdown ()	954	connection::shutdown ()
766	{	955	{
…		…
768	send_reset (si);	957	send_reset (si);
769		958
770	reset_connection ();	959	reset_connection ();
771	}	960	}
772		961
773	void	962	// poor-man's rekeying
774	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
775	{	965	{
776	w.at = TSTAMP_CANCEL;
777
778	reset_connection ();	966	reset_connection ();
779	establish_connection ();	967	establish_connection ();
780	}	968	}
781		969
782	void	970	void
783	connection::send_data_packet (tap_packet *pkt, bool broadcast)	971	connection::send_data_packet (tap_packet *pkt)
784	{	972	{
785	vpndata_packet *p = new vpndata_packet;	973	vpndata_packet *p = new vpndata_packet;
786	int tos = 0;	974	int tos = 0;
787		975
788	if (conf->inherit_tos	976	// I am not hilarious about peeking into packets, but so be it.
789	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	977	if (conf->inherit_tos && pkt->is_ipv4 ())
790	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
791	tos = (*pkt)[15] & IPTOS_TOS_MASK;	978	tos = (*pkt)[15] & IPTOS_TOS_MASK;
792		979
793	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	980	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
794	send_vpn_packet (p, si, tos);	981	send_vpn_packet (p, si, tos);
795		982
796	delete p;	983	delete p;
797		984
798	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
799	rekey ();	986	rekey ();
800	}	987	}
801		988
802	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
803	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1000	connection::inject_data_packet (tap_packet *pkt)
804	{	1001	{
805	if (ictx && octx)	1002	if (ictx && octx)
806	send_data_packet (pkt, broadcast);	1003	send_data_packet (pkt);
807	else	1004	else
808	{	1005	{
809	if (!broadcast)//DDDD
810	queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
811		1007	post_inject_queue ();
812	establish_connection ();
813	}	1008	}
814	}	1009	}
815		1010
		1011	void
816	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
817	{	1013	{
818	if (ictx && octx)	1014	if (ictx && octx)
819	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
820	else	1016	else
821	establish_connection ();	1017	{
		1018	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1019	post_inject_queue ();
		1020	}
822	}	1021	}
823		1022
824	void	1023	void
825	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
826	{	1025	{
827	last_activity = NOW;	1026	last_activity = ev_now ();
828		1027
829	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
830	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1030
		1031	if (connectmode == conf_node::C_DISABLED)
		1032	return;
831		1033
832	switch (pkt->typ ())	1034	switch (pkt->typ ())
833	{	1035	{
834	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
835	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
836	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
837	// when we receive a ping.	1041	// when we receive a ping.
838	if (!ictx)	1042	if (!ictx)
839	{	1043	{
840	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
841	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
842	}	1046	}
843	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
844	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
845		1051
846	break;	1052	break;
847		1053
848	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
849	break;	1060	break;
850		1061
851	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
852	{	1063	{
853	reset_connection ();	1064	reset_connection ();
854		1065
855	config_packet *p = (config_packet *) pkt;	1066	config_packet *p = (config_packet *) pkt;
856		1067
857	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
858	{
859	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
860	conf->nodename, (const char *)rsi);
861	connectmode = conf_node::C_DISABLED;
862	}
863	else if (connectmode == conf_node::C_ALWAYS)
864	establish_connection ();	1069	establish_connection ();
865	}	1070	}
866	break;	1071	break;
867		1072
868	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
869	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
870	{	1075	{
871	auth_req_packet *p = (auth_req_packet *) pkt;	1076	auth_req_packet *p = (auth_req_packet *)pkt;
872		1077
873	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
874		1081
875	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
876	{	1088	{
877	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
878	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
879	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
880	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
881		1093
882	if (p->initiate)	1094	if (p->initiate)
883	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
884		1096
885	rsachallenge k;	1097	auth_data auth;
886		1098
887	if (0 > RSA_private_decrypt (sizeof (p->encr),	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
888	(unsigned char *)&p->encr, (unsigned char *)&k,	1100	{
889	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
890	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
891	conf->nodename, (const char *)rsi);	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1103	}
892	else	1104	else
893	{	1105	{
894	delete octx;	1106	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
895		1107
896	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
897	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
898		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
899	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
		1116	features = p->features & config_packet::get_features ();
900		1117
901	send_auth_response (rsi, p->id, k);
902
903	connection_established ();	1118	connection_established (rsi);
904
905	break;	1119	}
906	}	1120	}
		1121
		1122	break;
907	}	1123	}
908		1124
909	send_reset (rsi);	1125	send_reset (rsi);
910	}	1126	}
911		1127
912	break;	1128	break;
913		1129
914	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
915	{	1131	{
916	auth_res_packet *p = (auth_res_packet *) pkt;	1132	auth_res_packet *p = (auth_res_packet *)pkt;
917		1133
918	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
919		1135
920	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
921	{	1140	{
922	if (p->prot_minor != PROTOCOL_MINOR)
923	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
924	conf->nodename, (const char *)rsi,
925	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
926
927	rsachallenge chg;
928
929	if (!rsa_cache.find (p->id, chg))
930	slog (L_ERR, _("%s(%s): unrequested auth response"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
931	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
932	else
933	{
934	crypto_ctx *cctx = new crypto_ctx (chg, 0);
935
936	if (!p->hmac_chk (cctx))
937	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
938	"could be an attack, or just corruption or an synchronization error"),
939	conf->nodename, (const char *)rsi);
940	else
941	{
942	rsaresponse h;
943
944	rsa_hash (p->id, chg, h);
945
946	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
947	{
948	prot_minor = p->prot_minor;
949
950	delete ictx; ictx = cctx;
951
952	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
953
954	si = rsi;
955	protocol = rsi.prot;
956
957	connection_established ();
958
959	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
960	conf->nodename, (const char *)rsi,
961	p->prot_major, p->prot_minor);
962
963	if (::conf.script_node_up)
964	run_script (run_script_cb (this, &connection::script_node_up), false);
965
966	break;
967	}
968	else
969	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
970	conf->nodename, (const char *)rsi);
971	}
972
973	delete cctx;
974	}	1143	}
		1144	else if (!have_snd_auth)
		1145	{
		1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1147
		1148	have_snd_auth = true;
		1149	connection_established (rsi);
975	}	1150	}
976	}	1151	}
977
978	send_reset (rsi);
979	break;	1152	break;
980		1153
981	case vpn_packet::PT_DATA_COMPRESSED:	1154	case vpn_packet::PT_DATA_COMPRESSED:
982	#if !ENABLE_COMPRESSION	1155	#if !ENABLE_COMPRESSION
983	send_reset (rsi);	1156	send_reset (rsi);
…		…
990	{	1163	{
991	vpndata_packet *p = (vpndata_packet *)pkt;	1164	vpndata_packet *p = (vpndata_packet *)pkt;
992		1165
993	if (!p->hmac_chk (ictx))	1166	if (!p->hmac_chk (ictx))
994	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1167	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
995	"could be an attack, or just corruption or an synchronization error"),	1168	"could be an attack, or just corruption or a synchronization error."),
996	conf->nodename, (const char *)rsi);	1169	conf->nodename, (const char *)rsi);
997	else	1170	else
998	{	1171	{
999	u32 seqno;	1172	u32 seqno;
1000	tap_packet *d = p->unpack (this, seqno);	1173	tap_packet *d = p->unpack (this, seqno);
		1174	int seqclass = iseqno.seqno_classify (seqno);
1001		1175
1002	if (iseqno.recv_ok (seqno))	1176	if (seqclass == 0) // ok
1003	{	1177	{
1004	vpn->tap->send (d);	1178	vpn->tap->send (d);
1005		1179
1006	if (p->dst () == 0) // re-broadcast
1007	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1008	{
1009	connection *c = *i;
1010
1011	if (c->conf != THISNODE && c->conf != conf)
1012	c->inject_data_packet (d);
1013	}
1014
1015	if (si != rsi)	1180	if (si != rsi)
1016	{	1181	{
1017	// fast re-sync on conneciton changes, useful especially for tcp/ip	1182	// fast re-sync on source address changes, useful especially for tcp/ip
		1183	//if (last_si_change < ev_now () + 5.)
1018	si = rsi;	1184	// {
1019
1020	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1185	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1021	conf->nodename, (const char *)si, (const char *)rsi);	1186	conf->nodename, (const char *)si, (const char *)rsi);
		1187
		1188	si = rsi;
		1189
		1190	if (::conf.script_node_change)
		1191	{
		1192	run_script_cb *cb = new run_script_cb;
		1193	cb->set<connection, &connection::script_node_change> (this);
		1194	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1195	}
		1196
		1197	// }
		1198	//else
		1199	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1200	// conf->nodename, (const char *)si, (const char *)rsi);
1022	}	1201	}
1023
1024	delete d;
1025
1026	break;
1027	}	1202	}
		1203	else if (seqclass == 1) // far history
		1204	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1205	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1206	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1207	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1208	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1209	else if (seqclass == 3) // reset
		1210	{
		1211	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1212	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1213	send_reset (rsi);
		1214	}
		1215
		1216	delete d;
		1217	break;
1028	}	1218	}
1029	}	1219	}
1030		1220
1031	send_reset (rsi);	1221	send_reset (rsi);
1032	break;	1222	break;
1033		1223
1034	case vpn_packet::PT_CONNECT_REQ:	1224	case vpn_packet::PT_CONNECT_REQ:
1035	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1225	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1036	{	1226	{
1037	connect_req_packet *p = (connect_req_packet *) pkt;	1227	connect_req_packet *p = (connect_req_packet *)pkt;
1038		1228
1039	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1229	if (p->id > 0 && p->id <= vpn->conns.size ())
1040	connection *c = vpn->conns[p->id - 1];
1041	conf->protocols = p->protocols;
1042
1043	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1044	conf->id, p->id, c->ictx && c->octx);
1045
1046	if (c->ictx && c->octx)
1047	{	1230	{
		1231	connection *c = vpn->conns[p->id - 1];
		1232	conf->protocols = p->protocols;
		1233
		1234	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1235	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1236	p->protocols,
		1237	c->ictx && c->octx);
		1238
		1239	if (c->ictx && c->octx)
		1240	{
1048	// send connect_info packets to both sides, in case one is	1241	// send connect_info packets to both sides, in case one is
1049	// behind a nat firewall (or both ;)	1242	// behind a nat firewall (or both ;)
1050	c->send_connect_info (conf->id, si, conf->protocols);	1243	c->send_connect_info (conf->id, si, conf->protocols);
1051	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1244	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1245	}
		1246	else
		1247	c->establish_connection ();
1052	}	1248	}
		1249	else
		1250	slog (L_WARN,
		1251	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1252	p->id);
1053	}	1253	}
1054		1254
1055	break;	1255	break;
1056		1256
1057	case vpn_packet::PT_CONNECT_INFO:	1257	case vpn_packet::PT_CONNECT_INFO:
1058	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1258	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1059	{	1259	{
1060	connect_info_packet *p = (connect_info_packet *) pkt;	1260	connect_info_packet *p = (connect_info_packet *)pkt;
1061		1261
1062	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1262	if (p->id > 0 && p->id <= vpn->conns.size ())
1063		1263	{
1064	connection *c = vpn->conns[p->id - 1];	1264	connection *c = vpn->conns[p->id - 1];
1065		1265
1066	c->conf->protocols = p->protocols;	1266	c->conf->protocols = p->protocols;
1067	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1267	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1068	p->si.upgrade_protocol (protocol, c->conf);	1268	p->si.upgrade_protocol (protocol, c->conf);
1069		1269
1070	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1270	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1071	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1271	conf->nodename,
		1272	vpn->conns[p->id - 1]->conf->nodename,
		1273	(const char *)p->si,
		1274	p->protocols,
		1275	protocol,
		1276	p->si.supported_protocols (c->conf),
		1277	!c->ictx && !c->octx);
1072		1278
1073	const sockinfo &dsi = forward_si (p->si);	1279	const sockinfo &dsi = forward_si (p->si);
1074		1280
1075	if (dsi.valid ())	1281	if (dsi.valid ())
1076	c->send_auth_request (dsi, true);	1282	c->send_auth_request (dsi, true);
		1283	else
		1284	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1285	vpn->conns[p->id - 1]->conf->nodename,
		1286	(const char *)p->si);
		1287	}
		1288	else
		1289	slog (L_WARN,
		1290	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1291	p->id);
1077	}	1292	}
1078		1293
1079	break;	1294	break;
1080		1295
1081	default:	1296	default:
1082	send_reset (rsi);	1297	send_reset (rsi);
1083	break;	1298	break;
1084	}	1299	}
1085	}	1300	}
1086		1301
1087	void connection::keepalive_cb (time_watcher &w)	1302	inline void
		1303	connection::keepalive_cb (ev::timer &w, int revents)
1088	{	1304	{
1089	if (NOW >= last_activity + ::conf.keepalive + 30)	1305	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1306
		1307	if (when >= 0)
		1308	w.start (when);
		1309	else if (when < -15)
1090	{	1310	{
1091	reset_connection ();	1311	reset_connection ();
1092	establish_connection ();	1312	establish_connection ();
1093	}	1313	}
1094	else if (NOW < last_activity + ::conf.keepalive)
1095	w.at = last_activity + ::conf.keepalive;
1096	else if (conf->connectmode != conf_node::C_ONDEMAND	1314	else if (conf->connectmode != conf_node::C_ONDEMAND
1097	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1315	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1098	{	1316	{
		1317	w.start (3);
1099	send_ping (si);	1318	send_ping (si);
1100	w.at = NOW + 5;
1101	}	1319	}
		1320	else if (when >= -10)
		1321	// hold ondemand connections implicitly a few seconds longer
		1322	// should delete octx, though, or something like that ;)
		1323	w.start (when + 10);
1102	else	1324	else
1103	reset_connection ();	1325	reset_connection ();
1104	}	1326	}
1105		1327
		1328	void
1106	void connection::send_connect_request (int id)	1329	connection::send_connect_request (int id)
1107	{	1330	{
1108	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1331	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1109		1332
1110	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1333	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1334	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1335	THISNODE->protocols);
1111	p->hmac_set (octx);	1336	p->hmac_set (octx);
1112	send_vpn_packet (p, si);	1337	send_vpn_packet (p, si);
1113		1338
1114	delete p;	1339	delete p;
1115	}	1340	}
1116		1341
1117	void connection::script_node ()	1342	void
		1343	connection::script_init_env (const char *ext)
1118	{	1344	{
1119	vpn->script_if_up ();
1120
1121	char *env;	1345	char *env;
		1346	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1347	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1348	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1349	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1350	conf->id & 0xff); putenv (env);
		1351	}
		1352
		1353	void
		1354	connection::script_init_connect_env ()
		1355	{
		1356	vpn->script_init_env ();
		1357
		1358	char *env;
1122	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1359	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1360	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1123	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1361	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1124	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1362	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1125	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1363	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1126	}	1364	}
1127		1365
		1366	inline const char *
1128	const char *connection::script_node_up ()	1367	connection::script_node_up ()
1129	{	1368	{
1130	script_node ();	1369	script_init_connect_env ();
1131		1370
1132	putenv ("STATE=up");	1371	putenv ((char *)"STATE=up");
1133		1372
		1373	char *filename;
		1374	asprintf (&filename,
		1375	"%s/%s",
		1376	confbase,
1134	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1377	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1135	}
1136		1378
		1379	return filename;
		1380	}
		1381
		1382	inline const char *
		1383	connection::script_node_change ()
		1384	{
		1385	script_init_connect_env ();
		1386
		1387	putenv ((char *)"STATE=change");
		1388
		1389	char *filename;
		1390	asprintf (&filename,
		1391	"%s/%s",
		1392	confbase,
		1393	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1394
		1395	return filename;
		1396	}
		1397
		1398	inline const char *
1137	const char *connection::script_node_down ()	1399	connection::script_node_down ()
1138	{	1400	{
1139	script_node ();	1401	script_init_connect_env ();
1140		1402
1141	putenv ("STATE=down");	1403	putenv ((char *)"STATE=down");
1142		1404
1143	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1405	char *filename;
1144	}	1406	asprintf (&filename,
		1407	"%s/%s",
		1408	confbase,
		1409	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1145		1410
		1411	return filename;
		1412	}
		1413
1146	connection::connection(struct vpn *vpn_)	1414	connection::connection (struct vpn *vpn, conf_node *conf)
1147	: vpn(vpn_)	1415	: vpn(vpn), conf(conf),
1148	, rekey (this, &connection::rekey_cb)	1416	#if ENABLE_DNS
1149	, keepalive (this, &connection::keepalive_cb)	1417	dns (0),
		1418	#endif
		1419	data_queue(conf->max_ttl, conf->max_queue + 1),
		1420	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1421	{
		1422	rekey .set<connection, &connection::rekey_cb > (this);
		1423	keepalive .set<connection, &connection::keepalive_cb > (this);
1150	, establish_connection (this, &connection::establish_connection_cb)	1424	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1151	{	1425
		1426	last_establish_attempt = 0.;
1152	octx = ictx = 0;	1427	octx = ictx = 0;
1153	retry_cnt = 0;
1154		1428
1155	connectmode = conf_node::C_ALWAYS; // initial setting	1429	connectmode = conf->connectmode;
		1430
		1431	// queue a dummy packet to force an initial connection attempt
		1432	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1433	vpn_queue.put (new net_packet);
		1434
1156	reset_connection ();	1435	reset_connection ();
1157	}	1436	}
1158		1437
1159	connection::~connection ()	1438	connection::~connection ()
1160	{	1439	{
1161	shutdown ();	1440	shutdown ();
1162	}	1441	}
1163		1442
		1443	void
1164	void connection_init ()	1444	connection_init ()
1165	{	1445	{
1166	auth_rate_limiter.clear ();	1446	auth_rate_limiter.clear ();
1167	reset_rate_limiter.clear ();	1447	reset_rate_limiter.clear ();
1168	}	1448	}
1169		1449

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