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Comparing gvpe/src/connection.C (file contents):
Revision 1.57 by pcg, Thu Jul 7 14:41:51 2005 UTC vs.
Revision 1.115 by root, Thu Jun 30 16:31:00 2016 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) 2003-2008,2010,2011,2013,2016 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
30		43
31	#include "conf.h"	44	#include "conf.h"
32	#include "slog.h"	45	#include "slog.h"
		46	#include "crypto.h"
33	#include "device.h"	47	#include "device.h"
34	#include "vpn.h"	48	#include "vpn.h"
35	#include "connection.h"	49	#include "connection.h"
		50	#include "hkdf.h"
36		51
37	#include "netcompat.h"	52	#include "netcompat.h"
38		53
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	54	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
44		55
45	#define ULTRA_FAST 1	56	#define ULTRA_FAST 1
46	#define HLOG 15	57	#define HLOG 15
47	#include "lzf/lzf.h"	58	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	59	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	60	#include "lzf/lzf_d.c"
50		61
		62	//////////////////////////////////////////////////////////////////////////////
		63
		64	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		65	static ev::child rs_child_ev;
		66
		67	namespace
		68	{
		69	void // c++ requires external linkage here, apparently :(
		70	rs_child_cb (ev::child &w, int revents)
		71	{
		72	w.stop ();
		73
		74	if (rs_queue.empty ())
		75	return;
		76
		77	pid_t pid = run_script (*rs_queue.front ().first, false);
		78	if (pid)
		79	{
		80	w.set (pid);
		81	w.start ();
		82	}
		83	else
		84	slog (L_WARN, rs_queue.front ().second);
		85
		86	delete rs_queue.front ().first;
		87	rs_queue.pop ();
		88	}
		89	};
		90
		91	// despite the fancy name, this is quite a hack
		92	static void
		93	run_script_queued (run_script_cb *cb, const char *warnmsg)
		94	{
		95	rs_queue.push (std::make_pair (cb, warnmsg));
		96
		97	if (!rs_child_ev.is_active ())
		98	{
		99	rs_child_ev.set<rs_child_cb> ();
		100	rs_child_ev ();
		101	}
		102	}
		103
		104	//////////////////////////////////////////////////////////////////////////////
		105
51	struct crypto_ctx	106	struct crypto_ctx
52	{	107	{
53	EVP_CIPHER_CTX cctx;	108	cipher cctx;
54	HMAC_CTX hctx;	109	hmac hctx;
55		110
56	crypto_ctx (const rsachallenge &challenge, int enc);	111	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	112	~crypto_ctx ();
58	};	113	};
59		114
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	115	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	116	{
		117	ecdh_key s;
		118
		119	curve25519_combine (a, b, s);
		120
		121	{
		122	u8 mac_key[MAC_KEYSIZE];
		123	static const unsigned char mac_info[] = "gvpe mac key";
		124
		125	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		126	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		127	kdf.extract (s, sizeof (s));
		128	kdf.extract_done (HKDF_PRF_HASH ());
		129	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		130
		131	hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ());
		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
62	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	145	require (EVP_CipherInit_ex (cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	146	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	147	}
67		148
68	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
69	{	150	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	151	require (EVP_CIPHER_CTX_cleanup (cctx));
71	HMAC_CTX_cleanup (&hctx);	152	}
		153
		154	static inline void
		155	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		156	{
		157	if (RSA_public_encrypt (sizeof (auth.rsa),
		158	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		159	key, RSA_PKCS1_OAEP_PADDING) < 0)
		160	fatal ("RSA_public_encrypt error");
		161
		162	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		163	}
		164
		165	static inline bool
		166	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		167	{
		168	u8 rsa_decrypt[RSA_KEYLEN];
		169
		170	if (RSA_private_decrypt (sizeof (encr.rsa),
		171	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		172	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		173	return 0;
		174
		175	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		176	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		177
		178	return 1;
72	}	179	}
73		180
74	static void	181	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	182	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	183	{
77	EVP_MD_CTX ctx;	184	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		185	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	186	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	187	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	188	}
86		189
87	struct rsa_entry {	190	void
88	tstamp expire;	191	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	192	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	193	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	194	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	195	// request data
102	{	196	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	197	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		198
105	erase (i);	199	// eventual response data
106	return true;	200	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	201	}
109		202
110	if (cleaner.at < NOW)	203	// every use prolongs the expiry
111	cleaner.start (NOW + RSA_TTL);	204	auth_expire = ev_now () + AUTH_TTL;
112
113	return false;
114	}
115
116	void gen (rsaid &id, rsachallenge &chg)
117	{
118	rsa_entry e;
119
120	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122
123	e.expire = NOW + RSA_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (cleaner.at < NOW)
130	cleaner.start (NOW + RSA_TTL);
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{ }
136
137	} rsa_cache;
138
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{
143	w.start (NOW + RSA_TTL);
144
145	for (iterator i = begin (); i != end (); )
146	if (i->expire <= NOW)
147	i = erase (i);
148	else
149	++i;
150	}
151	}	205	}
152		206
153	//////////////////////////////////////////////////////////////////////////////	207	//////////////////////////////////////////////////////////////////////////////
154		208
155	void pkt_queue::put (net_packet *p)	209	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		210	: max_ttl (max_ttl), max_queue (max_queue)
156	{	211	{
157	if (queue[i])	212	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		213
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	214	i = 0;
185	j = 0;	215	j = 0;
		216
		217	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	218	}
187		219
188	pkt_queue::~pkt_queue ()	220	pkt_queue::~pkt_queue ()
189	{	221	{
190	for (i = QUEUEDEPTH; --i > 0; )	222	while (net_packet *p = get ())
		223	delete p;
		224
191	delete queue[i];	225	delete [] queue;
192	}	226	}
193		227
		228	void
		229	pkt_queue::expire_cb (ev::timer &w, int revents)
		230	{
		231	ev_tstamp expire = ev_now () - max_ttl;
		232
		233	for (;;)
		234	{
		235	if (empty ())
		236	break;
		237
		238	double diff = queue[j].tstamp - expire;
		239
		240	if (diff >= 0.)
		241	{
		242	w.start (diff > 0.5 ? diff : 0.5);
		243	break;
		244	}
		245
		246	delete get ();
		247	}
		248	}
		249
		250	void
		251	pkt_queue::put (net_packet *p)
		252	{
		253	ev_tstamp now = ev_now ();
		254
		255	// start expiry timer
		256	if (empty ())
		257	expire.start (max_ttl);
		258
		259	int ni = i + 1 == max_queue ? 0 : i + 1;
		260
		261	if (ni == j)
		262	delete get ();
		263
		264	queue[i].pkt = p;
		265	queue[i].tstamp = now;
		266
		267	i = ni;
		268	}
		269
		270	net_packet *
		271	pkt_queue::get ()
		272	{
		273	if (empty ())
		274	return 0;
		275
		276	net_packet *p = queue[j].pkt;
		277	queue[j].pkt = 0;
		278
		279	j = j + 1 == max_queue ? 0 : j + 1;
		280
		281	return p;
		282	}
		283
194	struct net_rateinfo {	284	struct net_rateinfo
		285	{
195	u32 host;	286	u32 host;
196	double pcnt, diff;	287	double pcnt, diff;
197	tstamp last;	288	tstamp last;
198	};	289	};
199		290
…		…
209		300
210	bool can (const sockinfo &si) { return can((u32)si.host); }	301	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	302	bool can (u32 host);
212	};	303	};
213		304
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	305	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		306
		307	bool
216	bool net_rate_limiter::can (u32 host)	308	net_rate_limiter::can (u32 host)
217	{	309	{
218	iterator i;	310	iterator i;
219		311
220	for (i = begin (); i != end (); )	312	for (i = begin (); i != end (); )
221	if (i->host == host)	313	if (i->host == host)
222	break;	314	break;
223	else if (i->last < NOW - NRL_EXPIRE)	315	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	316	i = erase (i);
225	else	317	else
226	i++;	318	i++;
227		319
228	if (i == end ())	320	if (i == end ())
…		…
230	net_rateinfo ri;	322	net_rateinfo ri;
231		323
232	ri.host = host;	324	ri.host = host;
233	ri.pcnt = 1.;	325	ri.pcnt = 1.;
234	ri.diff = NRL_MAXDIF;	326	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	327	ri.last = ev_now ();
236		328
237	push_front (ri);	329	push_front (ri);
238		330
239	return true;	331	return true;
240	}	332	}
…		…
242	{	334	{
243	net_rateinfo ri (*i);	335	net_rateinfo ri (*i);
244	erase (i);	336	erase (i);
245		337
246	ri.pcnt = ri.pcnt * NRL_ALPHA;	338	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	339	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		340
249	ri.last = NOW;	341	ri.last = ev_now ();
250		342
251	double dif = ri.diff / ri.pcnt;	343	double dif = ri.diff / ri.pcnt;
252		344
253	bool send = dif > NRL_CUTOFF;	345	bool send = dif > NRL_CUTOFF;
254		346
…		…
266	}	358	}
267	}	359	}
268		360
269	/////////////////////////////////////////////////////////////////////////////	361	/////////////////////////////////////////////////////////////////////////////
270		362
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	363	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	364	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
274	{	365	{
275	unsigned int xlen;	366	ctx->hctx.init ();
276		367	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
277	HMAC_CTX *hctx = &ctx->hctx;	368	ctx->hctx.digest (hmac_digest);
278
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
281	len - sizeof (hmac_packet));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	369	}
284		370
285	void	371	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	372	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	373	{
288	hmac_gen (ctx);	374	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		375	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	376	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	377	}
292		378
293	bool	379	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	380	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	381	{
296	hmac_gen (ctx);	382	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		383	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	384	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
299	}	385	}
300		386
		387	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	388	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	389	{
303	type = type_;	390	type = type_;
304		391
305	int src = THISNODE->id;	392	int src = THISNODE->id;
306		393
…		…
308	srcdst = ((src >> 8) << 4) | (dst >> 8);	395	srcdst = ((src >> 8) << 4) | (dst >> 8);
309	dst1 = dst;	396	dst1 = dst;
310	}	397	}
311		398
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	399	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		400
315	struct vpndata_packet : vpn_packet	401	struct vpndata_packet : vpn_packet
		402	{
		403	u32 ctr; // seqno
		404	u8 data[MAXVPNDATA];
		405
		406	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		407	tap_packet *unpack (connection *conn, u32 &seqno);
		408
		409	private:
		410	const u32 data_hdr_size () const
316	{	411	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno	412	// the distance from beginning of packet to data member
318		413	return data - at (0);
319	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
320	tap_packet *unpack (connection *conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	414	}
		415	};
		416
		417	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		418	static unsigned char *
		419	expand_iv (u32 ctr)
		420	{
		421	static u32 iv[IV_SIZE (CIPHER) / 4];
		422
		423	require (sizeof (iv) == 4 * 4);
		424	require (IV_SIZE (CIPHER) % 4 == 0);
		425
		426	iv[0] =
		427	iv[1] =
		428	iv[2] = ctr;
		429
		430	// I would reuse ctr here to to avoid potential endianness issues,
		431	// but it seems openssl wraps around. While this would be still ok,
		432	// and I don't even know if its true, let's play safe and initialise
		433	// to 0.
		434	iv[3] = 0;
		435
		436	return (unsigned char *)iv;
		437	}
328		438
329	void	439	void
330	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	440	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
331	{	441	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	442	EVP_CIPHER_CTX *cctx = conn->octx->cctx;
333	int outl = 0, outl2;	443	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	444	ptype type = PT_DATA_UNCOMPRESSED;
335		445
336	#if ENABLE_COMPRESSION	446	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	447	u8 cdata[MAX_MTU];
338		448
339	if (conn->features & ENABLE_COMPRESSION)	449	if (conn->features & FEATURE_COMPRESSION)
340	{	450	{
341	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	451	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
342		452
343	if (cl)	453	if (cl)
344	{	454	{
…		…
350	d[1] = cl;	460	d[1] = cl;
351	}	461	}
352	}	462	}
353	#endif	463	#endif
354		464
		465	ctr = htonl (seqno);
		466
355	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	467	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
356
357	struct {
358	#if RAND_SIZE
359	u8 rnd[RAND_SIZE];
360	#endif
361	u32 seqno;
362	} datahdr;
363
364	datahdr.seqno = ntohl (seqno);
365	#if RAND_SIZE
366	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
367	#endif
368		468
369	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
370	(unsigned char *) data + outl, &outl2,	470	(unsigned char *)data + outl, &outl2,
371	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *)d, l));
372	outl += outl2;	472	outl += outl2;
373		473
374	require (EVP_EncryptUpdate (cctx,	474	// it seems this is a nop for us, but we do it anyways
375	(unsigned char *) data + outl, &outl2,	475	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
376	(unsigned char *) d, l));
377	outl += outl2;	476	outl += outl2;
378		477
379	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
380	outl += outl2;
381
382	len = outl + data_hdr_size ();	478	len = data_hdr_size () + outl;
383		479
384	set_hdr (type, dst);	480	set_hdr (type, dst);
385		481
386	hmac_set (conn->octx);	482	hmac_set (conn->octx);
387	}	483	}
388		484
389	tap_packet *	485	tap_packet *
390	vpndata_packet::unpack (connection *conn, u32 &seqno)	486	vpndata_packet::unpack (connection *conn, u32 &seqno)
391	{	487	{
392	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	488	EVP_CIPHER_CTX *cctx = conn->ictx->cctx;
393	int outl = 0, outl2;	489	int outl = 0, outl2;
394	tap_packet *p = new tap_packet;	490	tap_packet *p = new tap_packet;
395	u8 *d;	491	u8 *d;
396	u32 l = len - data_hdr_size ();
397		492
		493	seqno = ntohl (ctr);
		494
398	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	495	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
399		496
400	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
401	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
402		499
403	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
404	d = cdata;	501	d = cdata;
405	else	502	else
406	#endif	503	#endif
407	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6];
408		505
409	/* this overwrites part of the src mac, but we fix that later */	506	// this can overwrite the len/dst/src fields
410	require (EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
411	d, &outl2,	508	d, &outl2,
412	(unsigned char *)&data, len - data_hdr_size ()));	509	(unsigned char *)&data, len - data_hdr_size ()));
413	outl += outl2;	510	outl += outl2;
414		511
		512	// it seems this is a nop for us, but we do it anyways
415	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
416	outl += outl2;	514	outl += outl2;
417		515
418	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
419
420	id2mac (dst () ? dst() : THISNODE->id, p->dst);	516	id2mac (dst () ? dst() : THISNODE->id, p->dst);
421	id2mac (src (), p->src);	517	id2mac (src (), p->src);
422		518
423	#if ENABLE_COMPRESSION	519	#if ENABLE_COMPRESSION
424	if (type == PT_DATA_COMPRESSED)	520	if (type == PT_DATA_COMPRESSED)
425	{	521	{
426	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	522	u32 cl = (d[0] << 8) | d[1];
427		523
428	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	524	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
429	&(*p)[6 + 6], MAX_MTU)	525	&(*p)[6 + 6], MAX_MTU)
430	+ 6 + 6;	526	+ 6 + 6;
431	}	527	}
432	else	528	else
433	p->len = outl + (6 + 6 - DATAHDR);	529	p->len = outl + (6 + 6);
434	#endif	530	#endif
435		531
436	return p;	532	return p;
437	}	533	}
438		534
…		…
445	}	541	}
446	};	542	};
447		543
448	struct config_packet : vpn_packet	544	struct config_packet : vpn_packet
449	{	545	{
450	// actually, hmaclen cannot be checked because the hmac	546	u8 serial[SERIAL_SIZE];
451	// field comes before this data, so peers with other
452	// hmacs simply will not work.
453	u8 prot_major, prot_minor, randsize, hmaclen;	547	u8 prot_major, prot_minor, randsize;
454	u8 flags, challengelen, features, pad3;	548	u8 flags, features, pad6, pad7, pad8;
455	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
456		550
457	void setup (ptype type, int dst);	551	void setup (ptype type, int dst);
458	bool chk_config () const;	552	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
459		553
460	static u8 get_features ()	554	static u8 get_features ()
461	{	555	{
462	u8 f = 0;	556	u8 f = 0;
463	#if ENABLE_COMPRESSION	557	#if ENABLE_COMPRESSION
464	f |= FEATURE_COMPRESSION;	558	f |= FEATURE_COMPRESSION;
465	#endif	559	#endif
466	#if ENABLE_ROHC	560	#if ENABLE_ROHC
467	f |= FEATURE_ROHC;	561	f |= FEATURE_ROHC;
468	#endif	562	#endif
		563	#if ENABLE_BRIDGING
		564	f |= FEATURE_BRIDGING;
		565	#endif
469	return f;	566	return f;
470	}	567	}
471	};	568	};
472		569
		570	void
473	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
474	{	572	{
475	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
476	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
477	randsize = RAND_SIZE;
478	hmaclen = HMACLENGTH;
479	flags = 0;	575	flags = 0;
480	challengelen = sizeof (rsachallenge);
481	features = get_features ();	576	features = get_features ();
482		577
		578	strncpy ((char *)serial, conf.serial, sizeof (serial));
		579
483	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	580	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
484	digest_nid = htonl (EVP_MD_type (RSA_HASH));
485	hmac_nid = htonl (EVP_MD_type (DIGEST));	581	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		582	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
486		583
487	len = sizeof (*this) - sizeof (net_packet);	584	len = sizeof (*this) - sizeof (net_packet);
488	set_hdr (type, dst);	585	set_hdr (type, dst);
489	}	586	}
490		587
491	bool config_packet::chk_config () const	588	bool
		589	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
492	{	590	{
493	if (prot_major != PROTOCOL_MAJOR)	591	if (prot_major != PROTOCOL_MAJOR)
494	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	592	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
495	else if (randsize != RAND_SIZE)	593	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
496	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
497	else if (hmaclen != HMACLENGTH)
498	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
499	else if (challengelen != sizeof (rsachallenge))
500	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
501	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
502	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	595	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
503	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	596	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
504	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
505	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	597	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
506	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	598	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		599	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		600	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		601	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		602	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
507	else	603	else
		604	{
		605	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		606
		607	if (cmp > 0)
		608	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		609	conf->nodename, (const char *)rsi);
		610	else if (cmp == 0)
508	return true;	611	return true;
		612	}
509		613
510	return false;	614	return false;
511	}	615	}
512		616
513	struct auth_req_packet : config_packet	617	struct auth_req_packet : config_packet // UNPROTECTED
514	{	618	{
515	char magic[8];	619	char magic[8];
516	u8 initiate; // false if this is just an automatic reply	620	u8 initiate; // false if this is just an automatic reply
517	u8 protocols; // supported protocols (will be patched on forward)	621	u8 protocols; // supported protocols (will be patched on forward)
518	u8 pad2, pad3;	622	u8 pad2, pad3;
519	rsaid id;	623	auth_encr encr;
520	rsaencrdata encr;
521		624
522	auth_req_packet (int dst, bool initiate_, u8 protocols_)	625	auth_req_packet (int dst, bool initiate_, u8 protocols_)
523	{	626	{
524	config_packet::setup (PT_AUTH_REQ, dst);	627	config_packet::setup (PT_AUTH_REQ, dst);
525	strncpy (magic, MAGIC, 8);	628	memcpy (magic, MAGIC, 8);
526	initiate = !!initiate_;	629	initiate = !!initiate_;
527	protocols = protocols_;	630	protocols = protocols_;
528		631
529	len = sizeof (*this) - sizeof (net_packet);	632	len = sizeof (*this) - sizeof (net_packet);
530	}	633	}
531	};	634	};
532		635
533	struct auth_res_packet : config_packet	636	struct auth_res_packet : vpn_packet // UNPROTECTED
534	{	637	{
535	rsaid id;
536	u8 pad1, pad2, pad3;
537	u8 response_len; // encrypted length
538	rsaresponse response;	638	auth_response response;
539		639
540	auth_res_packet (int dst)	640	auth_res_packet (int dst)
541	{	641	{
542	config_packet::setup (PT_AUTH_RES, dst);	642	set_hdr (PT_AUTH_RES, dst);
543		643
544	len = sizeof (*this) - sizeof (net_packet);	644	len = sizeof (*this) - sizeof (net_packet);
545	}	645	}
546	};	646	};
547		647
…		…
577	};	677	};
578		678
579	/////////////////////////////////////////////////////////////////////////////	679	/////////////////////////////////////////////////////////////////////////////
580		680
581	void	681	void
582	connection::connection_established ()	682	connection::connection_established (const sockinfo &rsi)
583	{	683	{
584	if (ictx && octx)	684	if (!have_snd_auth || !have_rcv_auth)
		685	return;
		686
		687	si = rsi;
		688	protocol = rsi.prot;
		689
		690	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		691	conf->nodename, (const char *)rsi,
		692	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		693	PROTOCOL_MAJOR, prot_minor);
		694
		695	if (::conf.script_node_up)
		696	{
		697	run_script_cb *cb = new run_script_cb;
		698	cb->set<connection, &connection::script_node_up> (this);
		699	run_script_queued (cb, _("node-up command execution failed, continuing."));
585	{	700	}
586	connectmode = conf->connectmode;	701
		702	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		703	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
587		704
		705	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		706	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		707
588	// make sure rekeying timeouts are slightly asymmetric	708	// make sure rekeying timeouts are slightly asymmetric
589	rekey.start (NOW + ::conf.rekey	709	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
590	+ (conf->id > THISNODE->id ? 10 : 0));	710	rekey.start (rekey_interval, rekey_interval);
		711
		712	hmac_error = 0.;
		713
591	keepalive.start (NOW + ::conf.keepalive);	714	keepalive.start (::conf.keepalive);
592		715
593	// send queued packets	716	// send queued packets
594	if (ictx && octx)
595	{
596	while (tap_packet *p = (tap_packet *)data_queue.get ())	717	while (tap_packet *p = (tap_packet *)data_queue.get ())
597	{	718	{
598	send_data_packet (p);	719	if (p->len) send_data_packet (p);
599	delete p;	720	delete p;
600	}	721	}
601		722
602	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	723	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
603	{	724	{
604	send_vpn_packet (p, si, IPTOS_RELIABILITY);	725	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
605	delete p;	726	delete p;
606	}
607	}
608	}	727	}
		728
		729	vpn->connection_established (this);
		730	}
		731
		732	void
		733	connection::reset_si ()
		734	{
		735	if (vpn->can_direct (THISNODE, conf))
		736	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
609	else	737	else
610	{	738	{
611	retry_cnt = 0;	739	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
612	establish_connection.start (NOW + 5);	740	protocol = 0;
613	keepalive.stop ();
614	rekey.stop ();
615	}	741	}
616	}
617
618	void
619	connection::reset_si ()
620	{
621	protocol = best_protocol (THISNODE->protocols & conf->protocols);
622
623	// mask out protocols we cannot establish
624	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
625	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
626	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
627		742
628	si.set (conf, protocol);	743	si.set (conf, protocol);
629	}	744	}
630		745
631	// ensure sockinfo is valid, forward if necessary	746	// ensure sockinfo is valid, forward if necessary
632	const sockinfo &	747	const sockinfo &
633	connection::forward_si (const sockinfo &si) const	748	connection::forward_si (const sockinfo &si) const
634	{	749	{
635	if (!si.valid ())	750	if (!si.valid ())
636	{	751	{
637	connection *r = vpn->find_router ();	752	connection *r = vpn->find_router_for (this);
638		753
639	if (r)	754	if (r)
640	{	755	{
641	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	756	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
642	conf->nodename, r->conf->nodename, (const char *)r->si);	757	conf->nodename, r->conf->nodename);
643	return r->si;	758	return r->si;
644	}	759	}
645	else	760	else
646	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	761	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
647	conf->nodename);	762	conf->nodename);
648	}	763	}
649		764
650	return si;	765	return si;
651	}	766	}
652		767
653	void	768	void
654	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	769	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
655	{	770	{
656	if (!vpn->send_vpn_packet (pkt, si, tos))	771	if (!vpn->send_vpn_packet (pkt, si, tos))
657	reset_connection ();	772	reset_connection ("packet send error");
658	}	773	}
659		774
660	void	775	void
661	connection::send_ping (const sockinfo &si, u8 pong)	776	connection::send_ping (const sockinfo &si, u8 pong)
662	{	777	{
663	ping_packet *pkt = new ping_packet;	778	ping_packet *pkt = new ping_packet;
664		779
665	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	780	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		781
		782	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
666	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	783	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
667		784
668	delete pkt;	785	delete pkt;
669	}	786	}
670		787
…		…
685	void	802	void
686	connection::send_auth_request (const sockinfo &si, bool initiate)	803	connection::send_auth_request (const sockinfo &si, bool initiate)
687	{	804	{
688	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	805	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
689		806
690	rsachallenge chg;	807	generate_auth_data ();
691	rsa_cache.gen (pkt->id, chg);
692	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	808	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
693		809
694	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	810	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
695
696	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	811	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
697		812
698	delete pkt;	813	delete pkt;
699	}	814	}
700		815
701	void	816	void
702	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	817	connection::send_auth_response (const sockinfo &si)
703	{	818	{
704	auth_res_packet *pkt = new auth_res_packet (conf->id);	819	auth_res_packet *pkt = new auth_res_packet (conf->id);
705		820
706	pkt->id = id;	821	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		822	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
707		823
708	rsa_hash (id, chg, pkt->response);
709
710	pkt->hmac_set (octx);
711
712	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	824	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
713
714	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
715		826
716	delete pkt;	827	delete pkt;
717	}	828	}
718		829
719	void	830	void
720	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	831	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
721	{	832	{
722	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	833	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
723	conf->id, rid, (const char *)rsi);	834	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		835	conf->protocols);
724		836
725	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	837	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
726		838
727	r->hmac_set (octx);	839	r->hmac_set (octx);
728	send_vpn_packet (r, si);	840	send_vpn_packet (r, si);
729		841
730	delete r;	842	delete r;
731	}	843	}
732		844
733	void	845	inline void
734	connection::establish_connection_cb (time_watcher &w)	846	connection::establish_connection_cb (ev::timer &w, int revents)
735	{	847	{
736	if (!ictx	848	if (!(ictx && octx)
737	&& conf != THISNODE	849	&& conf != THISNODE
738	&& connectmode != conf_node::C_NEVER	850	&& connectmode != conf_node::C_NEVER
739	&& connectmode != conf_node::C_DISABLED	851	&& connectmode != conf_node::C_DISABLED
740	&& NOW > w.at)	852	&& !w.is_active ())
741	{	853	{
742	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	854	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		855	// and stop trying. should probably be handled by a per-connection expire handler.
		856	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		857	{
		858	reset_connection ("no demand");
		859	return;
		860	}
743		861
744	double retry_int = double (retry_cnt & 3	862	last_establish_attempt = ev_now ();
		863
		864	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
745	? (retry_cnt & 3) + 1	865	? (retry_cnt & 3) + 1
746	: 1 << (retry_cnt >> 2));	866	: 1 << (retry_cnt >> 2));
747		867
748	reset_si ();	868	reset_si ();
749		869
750	bool slow = si.prot & PROT_SLOW;	870	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
751		871
752	if (si.prot && !si.host)	872	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		873	{
		874	/*TODO*/ /* start the timer so we don't recurse endlessly */
		875	w.start (1);
753	vpn->send_connect_request (conf->id);	876	vpn->send_connect_request (this);
		877	}
754	else	878	else
755	{	879	{
		880	if (si.valid ())
		881	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		882	conf->nodename, (const char *)si);
		883
756	const sockinfo &dsi = forward_si (si);	884	const sockinfo &dsi = forward_si (si);
757		885
758	slow = slow || (dsi.prot & PROT_SLOW);	886	slow = slow || (dsi.prot & PROT_SLOW);
759		887
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	888	if (dsi.valid () && auth_rate_limiter.can (dsi))
761	{	889	{
762	if (retry_cnt < 4)	890	// use ping after the first few retries
		891	// TODO: on rekeys, the other node might not interpret ping correctly,
		892	// TODO: as it will still have a valid connection
		893	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
763	send_auth_request (dsi, true);	894	send_auth_request (dsi, true);
764	else	895	else
765	send_ping (dsi, 0);	896	send_ping (dsi, 0);
766	}	897	}
767	}	898	}
768		899
769	retry_int *= slow ? 8. : 0.7;	900	retry_int *= slow ? 4. : 0.9;
770		901
771	if (retry_int < conf->max_retry)	902	if (retry_int < conf->max_retry)
772	retry_cnt++;	903	retry_cnt++;
773	else	904	else
774	retry_int = conf->max_retry;	905	retry_int = conf->max_retry;
775		906
776	w.start (NOW + retry_int);	907	w.start (retry_int);
777	}	908	}
778	}	909	}
779		910
780	void	911	void
781	connection::reset_connection ()	912	connection::reset_connection (const char *reason)
782	{	913	{
783	if (ictx && octx)	914	if (ictx && octx)
784	{	915	{
785	slog (L_INFO, _("%s(%s): connection lost"),	916	slog (L_INFO, _("%s(%s): connection lost (%s)"),
786	conf->nodename, (const char *)si);	917	conf->nodename, (const char *)si, reason);
787		918
788	if (::conf.script_node_down)	919	if (::conf.script_node_down)
789	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	920	{
		921	run_script_cb *cb = new run_script_cb;
		922	cb->set<connection, &connection::script_node_down> (this);
790	slog (L_WARN, _("node-down command execution failed, continuing."));	923	run_script_queued (cb, _("node-down command execution failed, continuing."));
		924	}
791	}	925	}
792		926
793	delete ictx; ictx = 0;	927	delete ictx; ictx = 0;
794	delete octx; octx = 0;	928	delete octx; octx = 0;
795	#if ENABLE_DNS
796	dnsv4_reset_connection ();
797	#endif
798		929
799	si.host = 0;	930	si.host = 0;
800		931
		932	have_snd_auth = false;
		933	have_rcv_auth = false;
		934	auth_expire = 0.;
		935
801	last_activity = 0;	936	last_activity = 0.;
		937	//last_si_change = 0.;
802	retry_cnt = 0;	938	retry_cnt = 0;
803		939
804	rekey.stop ();	940	rekey.stop ();
805	keepalive.stop ();	941	keepalive.stop ();
806	establish_connection.stop ();	942	establish_connection.stop ();
…		…
810	connection::shutdown ()	946	connection::shutdown ()
811	{	947	{
812	if (ictx && octx)	948	if (ictx && octx)
813	send_reset (si);	949	send_reset (si);
814		950
815	reset_connection ();	951	reset_connection ("shutdown");
816	}	952	}
817		953
818	void	954	// poor-man's rekeying
819	connection::rekey_cb (time_watcher &w)	955	inline void
		956	connection::rekey_cb (ev::timer &w, int revents)
820	{	957	{
821	reset_connection ();	958	reset_connection ("rekeying");
822	establish_connection ();	959	establish_connection ();
823	}	960	}
824		961
825	void	962	void
826	connection::send_data_packet (tap_packet *pkt)	963	connection::send_data_packet (tap_packet *pkt)
…		…
840	if (oseqno > MAX_SEQNO)	977	if (oseqno > MAX_SEQNO)
841	rekey ();	978	rekey ();
842	}	979	}
843		980
844	void	981	void
		982	connection::post_inject_queue ()
		983	{
		984	// force a connection every now and when when packets are sent (max 1/s)
		985	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		986	establish_connection.stop ();
		987
		988	establish_connection ();
		989	}
		990
		991	void
845	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	992	connection::inject_data_packet (tap_packet *pkt)
846	{	993	{
847	if (ictx && octx)	994	if (ictx && octx)
848	send_data_packet (pkt);	995	send_data_packet (pkt);
849	else	996	else
850	{	997	{
851	if (!broadcast)
852	data_queue.put (new tap_packet (*pkt));	998	data_queue.put (new tap_packet (*pkt));
853		999	post_inject_queue ();
854	establish_connection ();
855	}	1000	}
856	}	1001	}
857		1002
		1003	void
858	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1004	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
859	{	1005	{
860	if (ictx && octx)	1006	if (ictx && octx)
861	send_vpn_packet (pkt, si, tos);	1007	send_vpn_packet (pkt, si, tos);
862	else	1008	else
863	{	1009	{
864	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1010	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
865		1011	post_inject_queue ();
866	establish_connection ();
867	}	1012	}
868	}	1013	}
869		1014
870	void	1015	void
871	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1016	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
872	{	1017	{
873	last_activity = NOW;	1018	last_activity = ev_now ();
874		1019
875	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1020	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
876	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1021	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1022
		1023	if (connectmode == conf_node::C_DISABLED)
		1024	return;
877		1025
878	switch (pkt->typ ())	1026	switch (pkt->typ ())
879	{	1027	{
880	case vpn_packet::PT_PING:	1028	case vpn_packet::PT_PING:
		1029	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1030
881	// we send pings instead of auth packets after some retries,	1031	// we send pings instead of auth packets after some retries,
882	// so reset the retry counter and establish a connection	1032	// so reset the retry counter and establish a connection
883	// when we receive a ping.	1033	// when we receive a ping.
884	if (!ictx)	1034	if (!ictx)
885	{	1035	{
886	if (auth_rate_limiter.can (rsi))	1036	if (auth_rate_limiter.can (rsi))
887	send_auth_request (rsi, true);	1037	send_auth_request (rsi, true);
888	}	1038	}
889	else	1039	else
		1040	// we would love to change the socket address here, but ping's aren't
		1041	// authenticated, so we best ignore it.
890	send_ping (rsi, 1); // pong	1042	send_ping (rsi, 1); // pong
891		1043
892	break;	1044	break;
893		1045
894	case vpn_packet::PT_PONG:	1046	case vpn_packet::PT_PONG:
		1047	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1048
		1049	// a PONG might mean that the other side doesn't really know
		1050	// about our desire for communication.
		1051	establish_connection ();
895	break;	1052	break;
896		1053
897	case vpn_packet::PT_RESET:	1054	case vpn_packet::PT_RESET:
		1055	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1056
		1057	if (ictx && octx)
898	{	1058	{
899	reset_connection ();	1059	reset_connection ("remote reset");
900		1060
901	config_packet *p = (config_packet *) pkt;	1061	config_packet *p = (config_packet *) pkt;
902		1062
903	if (!p->chk_config ())	1063	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
904	{
905	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
906	conf->nodename, (const char *)rsi);
907	connectmode = conf_node::C_DISABLED;
908	}
909	else if (connectmode == conf_node::C_ALWAYS)
910	establish_connection ();	1064	establish_connection ();
911	}	1065	}
		1066
912	break;	1067	break;
913		1068
914	case vpn_packet::PT_AUTH_REQ:	1069	case vpn_packet::PT_AUTH_REQ:
915	if (auth_rate_limiter.can (rsi))	1070	if (auth_rate_limiter.can (rsi))
916	{	1071	{
917	auth_req_packet *p = (auth_req_packet *) pkt;	1072	auth_req_packet *p = (auth_req_packet *)pkt;
918		1073
919	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1074	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1075	conf->nodename, p->initiate ? "initiate" : "reply",
		1076	p->protocols, p->features);
920		1077
921	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1078	if (memcmp (p->magic, MAGIC, 8))
		1079	{
		1080	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1081	conf->nodename, (const char *)rsi);
		1082	}
		1083	else if (p->chk_config (conf, rsi))
922	{	1084	{
923	if (p->prot_minor != PROTOCOL_MINOR)	1085	if (p->prot_minor != PROTOCOL_MINOR)
924	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1086	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
925	conf->nodename, (const char *)rsi,	1087	conf->nodename, (const char *)rsi,
926	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1088	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
927		1089
928	if (p->initiate)	1090	if (p->initiate)
		1091	{
929	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
930		1093
931	rsachallenge k;	1094	if (ictx && octx)
		1095	reset_connection ("reconnect");
		1096	}
932		1097
		1098	auth_data auth;
		1099
933	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1100	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
934	{	1101	{
935	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1102	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
936	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1103	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
937	break;
938	}	1104	}
939	else	1105	else
940	{	1106	{
941	delete octx;	1107	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
942		1108
943	octx = new crypto_ctx (k, 1);	1109	rcv_auth = auth;
944	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1110	have_rcv_auth = true;
945		1111
		1112	send_auth_response (rsi);
		1113
		1114	if (chg)
		1115	{
946	conf->protocols = p->protocols;	1116	conf->protocols = p->protocols;
947	features = p->features & config_packet::get_features ();	1117	features = p->features & config_packet::get_features ();
948		1118
949	send_auth_response (rsi, p->id, k);
950
951	connection_established ();	1119	connection_established (rsi);
952
953	break;	1120	}
954	}	1121	}
		1122
		1123	break;
955	}	1124	}
956	else
957	slog (L_WARN, _("%s(%s): protocol mismatch"),
958	conf->nodename, (const char *)rsi);
959		1125
960	send_reset (rsi);	1126	send_reset (rsi);
961	}	1127	}
962		1128
963	break;	1129	break;
964		1130
965	case vpn_packet::PT_AUTH_RES:	1131	case vpn_packet::PT_AUTH_RES:
966	{	1132	{
967	auth_res_packet *p = (auth_res_packet *) pkt;	1133	auth_res_packet *p = (auth_res_packet *)pkt;
968		1134
969	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1135	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
970		1136
971	if (p->chk_config ())	1137	auth_mac local_mac;
		1138	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1139
		1140	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
972	{	1141	{
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"),	1142	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
983	conf->nodename, (const char *)rsi);	1143	conf->nodename, (const char *)rsi);
984	break;
985	}	1144	}
986	else	1145	else if (!have_snd_auth)
987	{	1146	{
988	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1147	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
989		1148
990	if (!p->hmac_chk (cctx))	1149	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 ();	1150	connection_established (rsi);
1015
1016	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1017	conf->nodename, (const char *)rsi,
1018	p->prot_major, p->prot_minor);
1019
1020	if (::conf.script_node_up)
1021	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1022	slog (L_WARN, _("node-up command execution failed, continuing."));
1023
1024	break;
1025	}
1026	else
1027	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1028	conf->nodename, (const char *)rsi);
1029	}
1030
1031	delete cctx;
1032	}
1033	}	1151	}
1034	}	1152	}
1035
1036	send_reset (rsi);
1037	break;	1153	break;
1038		1154
1039	case vpn_packet::PT_DATA_COMPRESSED:	1155	case vpn_packet::PT_DATA_COMPRESSED:
1040	#if !ENABLE_COMPRESSION	1156	#if !ENABLE_COMPRESSION
1041	send_reset (rsi);	1157	send_reset (rsi);
…		…
1047	if (ictx && octx)	1163	if (ictx && octx)
1048	{	1164	{
1049	vpndata_packet *p = (vpndata_packet *)pkt;	1165	vpndata_packet *p = (vpndata_packet *)pkt;
1050		1166
1051	if (!p->hmac_chk (ictx))	1167	if (!p->hmac_chk (ictx))
		1168	{
		1169	// rekeying often creates temporary hmac auth floods
		1170	// we assume they don't take longer than a few seconds normally,
		1171	// and suppress messages and resets during that time.
		1172	//TODO: should be done per source address
		1173	if (!hmac_error)
		1174	{
		1175	hmac_error = ev_now () + 3;
		1176	break;
		1177	}
		1178	else if (hmac_error >= ev_now ())
		1179	break; // silently suppress
		1180	else
		1181	{
1052	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1182	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1053	"could be an attack, or just corruption or a synchronization error"),	1183	"could be an attack, or just corruption or a synchronization error."),
1054	conf->nodename, (const char *)rsi);	1184	conf->nodename, (const char *)rsi);
		1185	// reset
		1186	}
		1187	}
1055	else	1188	else
1056	{	1189	{
1057	u32 seqno;	1190	u32 seqno;
1058	tap_packet *d = p->unpack (this, seqno);	1191	tap_packet *d = p->unpack (this, seqno);
		1192	int seqclass = iseqno.seqno_classify (seqno);
1059		1193
1060	if (iseqno.recv_ok (seqno))	1194	hmac_error = 0;
		1195
		1196	if (seqclass == 0) // ok
1061	{	1197	{
1062	vpn->tap->send (d);	1198	vpn->tap->send (d);
1063		1199
1064	if (si != rsi)	1200	if (si != rsi)
1065	{	1201	{
1066	// fast re-sync on source address changes, useful especially for tcp/ip	1202	// fast re-sync on source address changes, useful especially for tcp/ip
		1203	//if (last_si_change < ev_now () + 5.)
1067	si = rsi;	1204	// {
1068
1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1205	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1070	conf->nodename, (const char *)si, (const char *)rsi);	1206	conf->nodename, (const char *)si, (const char *)rsi);
		1207
		1208	si = rsi;
		1209
		1210	if (::conf.script_node_change)
		1211	{
		1212	run_script_cb *cb = new run_script_cb;
		1213	cb->set<connection, &connection::script_node_change> (this);
		1214	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1215	}
		1216
		1217	// }
		1218	//else
		1219	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1220	// conf->nodename, (const char *)si, (const char *)rsi);
1071	}	1221	}
		1222	}
		1223	else if (seqclass == 1) // far history
		1224	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1225	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1226	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1227	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1228	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1229	else if (seqclass == 3) // reset
		1230	{
		1231	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1232	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1233	send_reset (rsi);
1072	}	1234	}
1073		1235
1074	delete d;	1236	delete d;
1075	break;	1237	break;
1076	}	1238	}
…		…
1080	break;	1242	break;
1081		1243
1082	case vpn_packet::PT_CONNECT_REQ:	1244	case vpn_packet::PT_CONNECT_REQ:
1083	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1245	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1084	{	1246	{
1085	connect_req_packet *p = (connect_req_packet *) pkt;	1247	connect_req_packet *p = (connect_req_packet *)pkt;
1086		1248
1087	if (p->id > 0 && p->id <= vpn->conns.size ())	1249	if (p->id > 0 && p->id <= vpn->conns.size ())
1088	{	1250	{
1089	connection *c = vpn->conns[p->id - 1];	1251	connection *c = vpn->conns[p->id - 1];
1090	conf->protocols = p->protocols;	1252	conf->protocols = p->protocols;
1091		1253
1092	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1254	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1255	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1256	p->protocols,
1093	conf->id, p->id, c->ictx && c->octx);	1257	c->ictx && c->octx);
1094		1258
1095	if (c->ictx && c->octx)	1259	if (c->ictx && c->octx)
1096	{	1260	{
1097	// send connect_info packets to both sides, in case one is	1261	// send connect_info packets to both sides, in case one is
1098	// behind a nat firewall (or both ;)	1262	// behind a nat firewall (or both ;)
…		…
1121		1285
1122	c->conf->protocols = p->protocols;	1286	c->conf->protocols = p->protocols;
1123	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1287	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1124	p->si.upgrade_protocol (protocol, c->conf);	1288	p->si.upgrade_protocol (protocol, c->conf);
1125		1289
1126	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1290	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1127	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1291	conf->nodename,
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si,
		1294	p->protocols,
		1295	protocol,
		1296	p->si.supported_protocols (c->conf),
		1297	!c->ictx && !c->octx);
1128		1298
1129	const sockinfo &dsi = forward_si (p->si);	1299	const sockinfo &dsi = forward_si (p->si);
1130		1300
1131	if (dsi.valid ())	1301	if (dsi.valid ())
1132	c->send_auth_request (dsi, true);	1302	c->send_auth_request (dsi, true);
		1303	else
		1304	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1305	vpn->conns[p->id - 1]->conf->nodename,
		1306	(const char *)p->si);
1133	}	1307	}
1134	else	1308	else
1135	slog (L_WARN,	1309	slog (L_WARN,
1136	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1310	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1137	p->id);	1311	p->id);
…		…
1143	send_reset (rsi);	1317	send_reset (rsi);
1144	break;	1318	break;
1145	}	1319	}
1146	}	1320	}
1147		1321
1148	void connection::keepalive_cb (time_watcher &w)	1322	inline void
		1323	connection::keepalive_cb (ev::timer &w, int revents)
1149	{	1324	{
1150	if (NOW >= last_activity + ::conf.keepalive + 30)	1325	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1326
		1327	if (when >= 0)
		1328	w.start (when);
		1329	else if (when < -15)
1151	{	1330	{
1152	reset_connection ();	1331	reset_connection ("keepalive overdue");
1153	establish_connection ();	1332	establish_connection ();
1154	}	1333	}
1155	else if (NOW < last_activity + ::conf.keepalive)
1156	w.start (last_activity + ::conf.keepalive);
1157	else if (conf->connectmode != conf_node::C_ONDEMAND	1334	else if (conf->connectmode != conf_node::C_ONDEMAND
1158	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1335	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1159	{	1336	{
		1337	w.start (3);
1160	send_ping (si);	1338	send_ping (si);
1161	w.start (NOW + 5);
1162	}	1339	}
1163	else if (NOW < last_activity + ::conf.keepalive + 10)	1340	else if (when >= -10)
1164	// hold ondemand connections implicitly a few seconds longer	1341	// hold ondemand connections implicitly a few seconds longer
1165	// should delete octx, though, or something like that ;)	1342	// should delete octx, though, or something like that ;)
1166	w.start (last_activity + ::conf.keepalive + 10);	1343	w.start (when + 10);
1167	else	1344	else
1168	reset_connection ();	1345	reset_connection ("keepalive timeout");
1169	}	1346	}
1170		1347
		1348	void
1171	void connection::send_connect_request (int id)	1349	connection::send_connect_request (int id)
1172	{	1350	{
1173	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1351	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1174		1352
1175	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1353	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1354	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1355	THISNODE->protocols);
1176	p->hmac_set (octx);	1356	p->hmac_set (octx);
1177	send_vpn_packet (p, si);	1357	send_vpn_packet (p, si);
1178		1358
1179	delete p;	1359	delete p;
1180	}	1360	}
1181		1361
		1362	void
1182	void connection::script_init_env (const char *ext)	1363	connection::script_init_env (const char *ext)
1183	{	1364	{
1184	char *env;	1365	char *env;
1185	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1366	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1186	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1367	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1187	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1368	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1188	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1369	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1189	conf->id & 0xff); putenv (env);	1370	conf->id & 0xff); putenv (env);
1190	}	1371	}
1191		1372
		1373	void
1192	void connection::script_init_connect_env ()	1374	connection::script_init_connect_env ()
1193	{	1375	{
1194	vpn->script_init_env ();	1376	vpn->script_init_env ();
1195		1377
1196	char *env;	1378	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1379	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1380	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1381	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1382	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1383	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1384	}
1202		1385
		1386	inline const char *
1203	const char *connection::script_node_up ()	1387	connection::script_node_up ()
1204	{	1388	{
1205	script_init_connect_env ();	1389	script_init_connect_env ();
1206		1390
1207	putenv ("STATE=up");	1391	putenv ((char *)"STATE=up");
1208		1392
1209	char *filename;	1393	char *filename;
1210	asprintf (&filename,	1394	asprintf (&filename,
1211	"%s/%s",	1395	"%s/%s",
1212	confbase,	1396	confbase,
1213	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1397	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1214		1398
1215	return filename;	1399	return filename;
1216	}	1400	}
1217		1401
1218	const char *connection::script_node_down ()	1402	inline const char *
		1403	connection::script_node_change ()
1219	{	1404	{
1220	script_init_connect_env ();	1405	script_init_connect_env ();
1221		1406
		1407	putenv ((char *)"STATE=change");
		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1414
		1415	return filename;
		1416	}
		1417
		1418	inline const char *
		1419	connection::script_node_down ()
		1420	{
		1421	script_init_connect_env ();
		1422
1222	putenv ("STATE=down");	1423	putenv ((char *)"STATE=down");
1223		1424
1224	char *filename;	1425	char *filename;
1225	asprintf (&filename,	1426	asprintf (&filename,
1226	"%s/%s",	1427	"%s/%s",
1227	confbase,	1428	confbase,
…		…
1229		1430
1230	return filename;	1431	return filename;
1231	}	1432	}
1232		1433
1233	connection::connection (struct vpn *vpn, conf_node *conf)	1434	connection::connection (struct vpn *vpn, conf_node *conf)
1234	: vpn(vpn), conf(conf)	1435	: vpn(vpn), conf(conf),
1235	, rekey (this, &connection::rekey_cb)
1236	, keepalive (this, &connection::keepalive_cb)
1237	, establish_connection (this, &connection::establish_connection_cb)
1238	#if ENABLE_DNS	1436	#if ENABLE_DNS
1239	, dns (0)	1437	dns (0),
1240	#endif	1438	#endif
		1439	data_queue(conf->max_ttl, conf->max_queue + 1),
		1440	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1241	{	1441	{
		1442	rekey .set<connection, &connection::rekey_cb > (this);
		1443	keepalive .set<connection, &connection::keepalive_cb > (this);
		1444	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1445
		1446	last_establish_attempt = 0.;
1242	octx = ictx = 0;	1447	octx = ictx = 0;
1243	retry_cnt = 0;
1244		1448
1245	if (!conf->protocols) // make sure some protocol is enabled	1449	connectmode = conf->connectmode;
1246	conf->protocols = PROT_UDPv4;
1247		1450
1248	connectmode = conf_node::C_ALWAYS; // initial setting	1451	// queue a dummy packet to force an initial connection attempt
		1452	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1453	vpn_queue.put (new net_packet);
		1454
1249	reset_connection ();	1455	reset_connection ("startup");
1250	}	1456	}
1251		1457
1252	connection::~connection ()	1458	connection::~connection ()
1253	{	1459	{
1254	shutdown ();	1460	shutdown ();
1255	}	1461	}
1256		1462
		1463	void
1257	void connection_init ()	1464	connection_init ()
1258	{	1465	{
1259	auth_rate_limiter.clear ();	1466	auth_rate_limiter.clear ();
1260	reset_rate_limiter.clear ();	1467	reset_rate_limiter.clear ();
1261	}	1468	}
1262		1469

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