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Comparing gvpe/src/connection.C (file contents):
Revision 1.34 by pcg, Mon May 10 18:57:07 2004 UTC vs.
Revision 1.110 by root, Thu Jan 9 08:15:05 2014 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
30		43
31	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
32		50
33	#include "conf.h"	51	#include "conf.h"
34	#include "slog.h"	52	#include "slog.h"
35	#include "device.h"	53	#include "device.h"
36	#include "vpn.h"	54	#include "vpn.h"
37	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
38		57
39	#include "netcompat.h"	58	#include "netcompat.h"
40		59
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
46		62
47	#define ULTRA_FAST 1	63	#define ULTRA_FAST 1
48	#define HLOG 15	64	#define HLOG 15
49	#include "lzf/lzf.h"	65	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	66	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	67	#include "lzf/lzf_d.c"
52		68
		69	//////////////////////////////////////////////////////////////////////////////
		70
		71	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		72	static ev::child rs_child_ev;
		73
		74	namespace
		75	{
		76	void // c++ requires external linkage here, apparently :(
		77	rs_child_cb (ev::child &w, int revents)
		78	{
		79	w.stop ();
		80
		81	if (rs_queue.empty ())
		82	return;
		83
		84	pid_t pid = run_script (*rs_queue.front ().first, false);
		85	if (pid)
		86	{
		87	w.set (pid);
		88	w.start ();
		89	}
		90	else
		91	slog (L_WARN, rs_queue.front ().second);
		92
		93	delete rs_queue.front ().first;
		94	rs_queue.pop ();
		95	}
		96	};
		97
		98	// despite the fancy name, this is quite a hack
		99	static void
		100	run_script_queued (run_script_cb *cb, const char *warnmsg)
		101	{
		102	rs_queue.push (std::make_pair (cb, warnmsg));
		103
		104	if (!rs_child_ev.is_active ())
		105	{
		106	rs_child_ev.set<rs_child_cb> ();
		107	rs_child_ev ();
		108	}
		109	}
		110
		111	//////////////////////////////////////////////////////////////////////////////
		112
53	struct crypto_ctx	113	struct crypto_ctx
54	{	114	{
55	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	116	HMAC_CTX hctx;
57		117
58	crypto_ctx (const rsachallenge &challenge, int enc);	118	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	119	~crypto_ctx ();
60	};	120	};
61		121
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	122	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	123	{
		124	ecdh_key s;
		125
		126	curve25519_combine (a, b, s);
		127
		128	{
		129	u8 mac_key[MAC_KEYSIZE];
		130	static const unsigned char mac_info[] = "gvpe mac key";
		131
		132	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		133	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		134	kdf.extract (s, sizeof (s));
		135	kdf.extract_done (HKDF_PRF_HASH ());
		136	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		137
		138	HMAC_CTX_init (&hctx);
		139	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		140	}
		141
		142	{
		143	u8 cipher_key[CIPHER_KEYSIZE];
		144	static const unsigned char cipher_info[] = "gvpe cipher key";
		145
		146	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		147	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		148	kdf.extract (s, sizeof (s));
		149	kdf.extract_done (HKDF_PRF_HASH ());
		150	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		151
64	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	154	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	155	}
69		156
70	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
71	{	158	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
74	}	161	}
75		162
		163	static inline void
		164	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		165	{
		166	if (RSA_public_encrypt (sizeof (auth.rsa),
		167	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		168	key, RSA_PKCS1_OAEP_PADDING) < 0)
		169	fatal ("RSA_public_encrypt error");
		170
		171	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		172	}
		173
		174	static inline bool
		175	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		176	{
		177	u8 rsa_decrypt[RSA_KEYLEN];
		178
		179	if (RSA_private_decrypt (sizeof (encr.rsa),
		180	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		181	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		182	return 0;
		183
		184	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		185	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		186
		187	return 1;
		188	}
		189
76	static void	190	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	192	{
79	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	197	}
88		198
89	struct rsa_entry {	199	void
90	tstamp expire;	200	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	201	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	203	{
		204	// request data
		205	rand_fill (snd_auth.rsa);
		206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		207
139	} rsa_cache;	208	// eventual response data
140		209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	210	}
145	w.start (NOW + RSA_TTL);
146		211
147	for (iterator i = begin (); i != end (); )	212	// every use prolongs the expiry
148	if (i->expire <= NOW)	213	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	214	}
154		215
155	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
156		217
157	void pkt_queue::put (net_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
158	{	220	{
159	if (queue[i])	221	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		222
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	223	i = 0;
187	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	227	}
189		228
190	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
191	{	230	{
192	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
193	delete queue[i];	234	delete [] queue;
194	}	235	}
195		236
		237	void
		238	pkt_queue::expire_cb (ev::timer &w, int revents)
		239	{
		240	ev_tstamp expire = ev_now () - max_ttl;
		241
		242	for (;;)
		243	{
		244	if (empty ())
		245	break;
		246
		247	double diff = queue[j].tstamp - expire;
		248
		249	if (diff >= 0.)
		250	{
		251	w.start (diff > 0.5 ? diff : 0.5);
		252	break;
		253	}
		254
		255	delete get ();
		256	}
		257	}
		258
		259	void
		260	pkt_queue::put (net_packet *p)
		261	{
		262	ev_tstamp now = ev_now ();
		263
		264	// start expiry timer
		265	if (empty ())
		266	expire.start (max_ttl);
		267
		268	int ni = i + 1 == max_queue ? 0 : i + 1;
		269
		270	if (ni == j)
		271	delete get ();
		272
		273	queue[i].pkt = p;
		274	queue[i].tstamp = now;
		275
		276	i = ni;
		277	}
		278
		279	net_packet *
		280	pkt_queue::get ()
		281	{
		282	if (empty ())
		283	return 0;
		284
		285	net_packet *p = queue[j].pkt;
		286	queue[j].pkt = 0;
		287
		288	j = j + 1 == max_queue ? 0 : j + 1;
		289
		290	return p;
		291	}
		292
196	struct net_rateinfo {	293	struct net_rateinfo
		294	{
197	u32 host;	295	u32 host;
198	double pcnt, diff;	296	double pcnt, diff;
199	tstamp last;	297	tstamp last;
200	};	298	};
201		299
202	// only do action once every x seconds per host whole allowing bursts.	300	// only do action once every x seconds per host whole allowing bursts.
203	// this implementation ("splay list" ;) is inefficient,	301	// this implementation ("splay list" ;) is inefficient,
204	// but low on resources.	302	// but low on resources.
205	struct net_rate_limiter : list<net_rateinfo>	303	struct net_rate_limiter : list<net_rateinfo>
206	{	304	{
207	# define NRL_ALPHA 1. - 1. / 600. // allow bursts	305	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
208	# define NRL_CUTOFF 10. // one event every CUTOFF seconds	306	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
209	# define NRL_EXPIRE NRL_CUTOFF * 30. // expire entries after this time	307	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
210	# define NRL_MAXDIF NRL_CUTOFF * (1. / (1. - NRL_ALPHA)) // maximum diff /count value	308	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
211		309
212	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	311	bool can (u32 host);
214	};	312	};
215		313
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		315
		316	bool
218	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
219	{	318	{
220	iterator i;	319	iterator i;
221		320
222	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
223	if (i->host == host)	322	if (i->host == host)
224	break;	323	break;
225	else if (i->last < NOW - NRL_EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	325	i = erase (i);
227	else	326	else
228	i++;	327	i++;
229		328
230	if (i == end ())	329	if (i == end ())
…		…
232	net_rateinfo ri;	331	net_rateinfo ri;
233		332
234	ri.host = host;	333	ri.host = host;
235	ri.pcnt = 1.;	334	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	335	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	336	ri.last = ev_now ();
238		337
239	push_front (ri);	338	push_front (ri);
240		339
241	return true;	340	return true;
242	}	341	}
…		…
244	{	343	{
245	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
246	erase (i);	345	erase (i);
247		346
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		349
251	ri.last = NOW;	350	ri.last = ev_now ();
252		351
253	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
254		353
255	bool send = dif > NRL_CUTOFF;	354	bool send = dif > NRL_CUTOFF;
256		355
…		…
268	}	367	}
269	}	368	}
270		369
271	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
272		371
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	374	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
280		376
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	380	}
286		381
287	void	382	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	384	{
290	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		386	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	388	}
294		389
295	bool	390	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	392	{
298	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		394	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	396	}
302		397
		398	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	400	{
305	type = type_;	401	type = type_;
306		402
307	int src = THISNODE->id;	403	int src = THISNODE->id;
308		404
…		…
313		409
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		412
317	struct vpndata_packet : vpn_packet	413	struct vpndata_packet : vpn_packet
		414	{
		415	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		416
		417	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		418	tap_packet *unpack (connection *conn, u32 &seqno);
		419
		420	private:
		421	const u32 data_hdr_size () const
318	{	422	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	424	}
		425	};
330		426
331	void	427	void
332	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	428	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
333	{	429	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
337		433
338	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
340		436
341	if (conn->features & ENABLE_COMPRESSION)	437	if (conn->features & FEATURE_COMPRESSION)
342	{	438	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		440
345	if (cl)	441	if (cl)
346	{	442	{
…		…
352	d[1] = cl;	448	d[1] = cl;
353	}	449	}
354	}	450	}
355	#endif	451	#endif
356		452
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		454
359	struct {	455	struct {
360	#if RAND_SIZE	456	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
362	#endif	458	#endif
363	u32 seqno;	459	u32 seqno;
364	} datahdr;	460	} datahdr;
365		461
366	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	463	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	464	// NB: a constant (per session) random prefix
		465	// is likely enough, but we don't take any chances.
		466	conn->oiv.get (datahdr.rnd, RAND_SIZE);
369	#endif	467	#endif
370		468
371	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	493	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
397	u8 *d;	495	u8 *d;
398	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
399		497
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		499
402	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
404		502
405	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	504	d = cdata;
407	else	505	else
408	#endif	506	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
410		508
411	/* this overwrites part of the src mac, but we fix that later */	509	// we play do evil games with the struct layout atm.
		510	// pending better solutions, we at least do some verification.
		511	// this is fine, as we left ISO territory long ago.
		512	require (DATAHDR <= 16);
		513	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		514
		515	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	517	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	518	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	519	outl += outl2;
416		520
…		…
447	}	551	}
448	};	552	};
449		553
450	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
451	{	555	{
452	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
458		560
459	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
460	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		563
462	static u8 get_features ()	564	static u8 get_features ()
463	{	565	{
464	u8 f = 0;	566	u8 f = 0;
465	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
466	f |= FEATURE_COMPRESSION;	568	f |= FEATURE_COMPRESSION;
467	#endif	569	#endif
468	#if ENABLE_ROHC	570	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	571	f |= FEATURE_ROHC;
470	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
471	return f;	576	return f;
472	}	577	}
473	};	578	};
474		579
		580	void
475	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
476	{	582	{
477	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	586	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	587	features = get_features ();
484		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	592	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		593	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		594
489	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	596	set_hdr (type, dst);
491	}	597	}
492		598
493	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	601	{
495	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
499	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	#if 0 // this implementation should handle all flag settings
502	else if (flags != curflags ())
503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504	#endif
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	612	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		613	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		614	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		615	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		616	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		620
		621	if (cmp > 0)
		622	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		623	conf->nodename, (const char *)rsi);
		624	else if (cmp == 0)
514	return true;	625	return true;
		626	}
515		627
516	return false;	628	return false;
517	}	629	}
518		630
519	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
520	{	632	{
521	char magic[8];	633	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	636	u8 pad2, pad3;
525	rsaid id;	637	auth_encr encr;
526	rsaencrdata encr;
527		638
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	640	{
530	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	643	initiate = !!initiate_;
533	protocols = protocols_;	644	protocols = protocols_;
534		645
535	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
536	}	647	}
537	};	648	};
538		649
539	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	651	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	652	auth_response response;
545		653
546	auth_res_packet (int dst)	654	auth_res_packet (int dst)
547	{	655	{
548	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
549		657
550	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
551	}	659	}
552	};	660	};
553		661
…		…
583	};	691	};
584		692
585	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
586		694
587	void	695	void
588	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
589	{	697	{
590	if (ictx && octx)	698	if (!have_snd_auth || !have_rcv_auth)
		699	return;
		700
		701	si = rsi;
		702	protocol = rsi.prot;
		703
		704	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		705	conf->nodename, (const char *)rsi,
		706	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		707	PROTOCOL_MAJOR, prot_minor);
		708
		709	if (::conf.script_node_up)
		710	{
		711	run_script_cb *cb = new run_script_cb;
		712	cb->set<connection, &connection::script_node_up> (this);
		713	run_script_queued (cb, _("node-up command execution failed, continuing."));
591	{	714	}
592	connectmode = conf->connectmode;	715
		716	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		717	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
593		718
594	rekey.start (NOW + ::conf.rekey);	719	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		720	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		721
		722	oiv.reset ();
		723
		724	// make sure rekeying timeouts are slightly asymmetric
		725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		726	rekey.start (rekey_interval, rekey_interval);
		727
		728	hmac_error = 0.;
		729
595	keepalive.start (NOW + ::conf.keepalive);	730	keepalive.start (::conf.keepalive);
596		731
597	// send queued packets	732	// send queued packets
598	if (ictx && octx)
599	{
600	while (tap_packet *p = (tap_packet *)data_queue.get ())	733	while (tap_packet *p = (tap_packet *)data_queue.get ())
601	{	734	{
602	send_data_packet (p);	735	if (p->len) send_data_packet (p);
603	delete p;	736	delete p;
604	}	737	}
605		738
606	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	739	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
607	{	740	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;	742	delete p;
610	}
611	}
612	}	743	}
		744
		745	vpn->connection_established (this);
		746	}
		747
		748	void
		749	connection::reset_si ()
		750	{
		751	if (vpn->can_direct (THISNODE, conf))
		752	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
613	else	753	else
614	{	754	{
615	retry_cnt = 0;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
616	establish_connection.start (NOW + 5);	756	protocol = 0;
617	keepalive.stop ();
618	rekey.stop ();
619	}	757	}
620	}
621
622	void
623	connection::reset_si ()
624	{
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);
626
627	// mask out protocols we cannot establish
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
630		758
631	si.set (conf, protocol);	759	si.set (conf, protocol);
632	}	760	}
633		761
634	// ensure sockinfo is valid, forward if necessary	762	// ensure sockinfo is valid, forward if necessary
635	const sockinfo &	763	const sockinfo &
636	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
637	{	765	{
638	if (!si.valid ())	766	if (!si.valid ())
639	{	767	{
640	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
641		769
642	if (r)	770	if (r)
643	{	771	{
644	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
645	conf->nodename, r->conf->nodename);	773	conf->nodename, r->conf->nodename);
646	return r->si;	774	return r->si;
647	}	775	}
648	else	776	else
649	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
650	conf->nodename);	778	conf->nodename);
651	}	779	}
652		780
653	return si;	781	return si;
654	}	782	}
655		783
656	void	784	void
657	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	785	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
658	{	786	{
659	if (!vpn->send_vpn_packet (pkt, si, tos))	787	if (!vpn->send_vpn_packet (pkt, si, tos))
660	reset_connection ();	788	reset_connection ("packet send error");
661	}	789	}
662		790
663	void	791	void
664	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
665	{	793	{
666	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
667		795
668	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	796	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		797
		798	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
669	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
670		800
671	delete pkt;	801	delete pkt;
672	}	802	}
673		803
…		…
688	void	818	void
689	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
690	{	820	{
691	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	821	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
692		822
693	rsachallenge chg;	823	generate_auth_data ();
694	rsa_cache.gen (pkt->id, chg);
695	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
696		825
697	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
698
699	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
700		828
701	delete pkt;	829	delete pkt;
702	}	830	}
703		831
704	void	832	void
705	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
706	{	834	{
707	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
708		836
709	pkt->id = id;	837	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		838	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
710		839
711	rsa_hash (id, chg, pkt->response);
712
713	pkt->hmac_set (octx);
714
715	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	840	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
716
717	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	841	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
718		842
719	delete pkt;	843	delete pkt;
720	}	844	}
721		845
722	void	846	void
723	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
724	{	848	{
725	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
726	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
727		852
728	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	853	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
729		854
730	r->hmac_set (octx);	855	r->hmac_set (octx);
731	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
732		857
733	delete r;	858	delete r;
734	}	859	}
735		860
736	void	861	inline void
737	connection::establish_connection_cb (time_watcher &w)	862	connection::establish_connection_cb (ev::timer &w, int revents)
738	{	863	{
739	if (!ictx	864	if (!(ictx && octx)
740	&& conf != THISNODE	865	&& conf != THISNODE
741	&& connectmode != conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
742	&& connectmode != conf_node::C_DISABLED	867	&& connectmode != conf_node::C_DISABLED
743	&& NOW > w.at)	868	&& !w.is_active ())
744	{	869	{
745	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
746		871	// and stop trying. should probably be handled by a per-connection expire handler.
747	if (retry_int < 3600 * 8)	872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
748	retry_cnt++;	875	return;
		876	}
749		877
750	w.start (NOW + retry_int);	878	last_establish_attempt = ev_now ();
		879
		880	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		881	? (retry_cnt & 3) + 1
		882	: 1 << (retry_cnt >> 2));
751		883
752	reset_si ();	884	reset_si ();
753		885
754	if (si.prot && !si.host)	886	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
		887
		888	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		889	{
		890	/*TODO*/ /* start the timer so we don't recurse endlessly */
		891	w.start (1);
755	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
		893	}
756	else	894	else
757	{	895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
758	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
		901
		902	slow = slow || (dsi.prot & PROT_SLOW);
759		903
760	if (dsi.valid () && auth_rate_limiter.can (dsi))	904	if (dsi.valid () && auth_rate_limiter.can (dsi))
761	{	905	{
762	if (retry_cnt < 4)	906	// use ping after the first few retries
		907	// TODO: on rekeys, the other node might not interpret ping correctly,
		908	// TODO: as it will still have a valid connection
		909	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
763	send_auth_request (dsi, true);	910	send_auth_request (dsi, true);
764	else	911	else
765	send_ping (dsi, 0);	912	send_ping (dsi, 0);
766	}	913	}
767	}	914	}
768	}
769	}
770		915
		916	retry_int *= slow ? 4. : 0.9;
		917
		918	if (retry_int < conf->max_retry)
		919	retry_cnt++;
		920	else
		921	retry_int = conf->max_retry;
		922
		923	w.start (retry_int);
		924	}
		925	}
		926
771	void	927	void
772	connection::reset_connection ()	928	connection::reset_connection (const char *reason)
773	{	929	{
774	if (ictx && octx)	930	if (ictx && octx)
775	{	931	{
776	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost (%s)"),
777	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si, reason);
778		934
779	if (::conf.script_node_down)	935	if (::conf.script_node_down)
780	run_script (run_script_cb (this, &connection::script_node_down), false);	936	{
		937	run_script_cb *cb = new run_script_cb;
		938	cb->set<connection, &connection::script_node_down> (this);
		939	run_script_queued (cb, _("node-down command execution failed, continuing."));
		940	}
781	}	941	}
782		942
783	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
784	delete octx; octx = 0;	944	delete octx; octx = 0;
785		945
786	si.host= 0;	946	si.host = 0;
787		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
788	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
789	retry_cnt = 0;	954	retry_cnt = 0;
790		955
791	rekey.stop ();	956	rekey.stop ();
792	keepalive.stop ();	957	keepalive.stop ();
793	establish_connection.stop ();	958	establish_connection.stop ();
…		…
797	connection::shutdown ()	962	connection::shutdown ()
798	{	963	{
799	if (ictx && octx)	964	if (ictx && octx)
800	send_reset (si);	965	send_reset (si);
801		966
802	reset_connection ();	967	reset_connection ("shutdown");
803	}	968	}
804		969
805	void	970	// poor-man's rekeying
806	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
807	{	973	{
808	reset_connection ();	974	reset_connection ("rekeying");
809	establish_connection ();	975	establish_connection ();
810	}	976	}
811		977
812	void	978	void
813	connection::send_data_packet (tap_packet *pkt)	979	connection::send_data_packet (tap_packet *pkt)
…		…
827	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
828	rekey ();	994	rekey ();
829	}	995	}
830		996
831	void	997	void
		998	connection::post_inject_queue ()
		999	{
		1000	// force a connection every now and when when packets are sent (max 1/s)
		1001	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1002	establish_connection.stop ();
		1003
		1004	establish_connection ();
		1005	}
		1006
		1007	void
832	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1008	connection::inject_data_packet (tap_packet *pkt)
833	{	1009	{
834	if (ictx && octx)	1010	if (ictx && octx)
835	send_data_packet (pkt);	1011	send_data_packet (pkt);
836	else	1012	else
837	{	1013	{
838	if (!broadcast)//DDDD
839	data_queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
840		1015	post_inject_queue ();
841	establish_connection ();
842	}	1016	}
843	}	1017	}
844		1018
		1019	void
845	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
846	{	1021	{
847	if (ictx && octx)	1022	if (ictx && octx)
848	send_vpn_packet (pkt, si, tos);	1023	send_vpn_packet (pkt, si, tos);
849	else	1024	else
850	{	1025	{
851	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1026	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
852		1027	post_inject_queue ();
853	establish_connection ();
854	}	1028	}
855	}	1029	}
856		1030
857	void	1031	void
858	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
859	{	1033	{
860	last_activity = NOW;	1034	last_activity = ev_now ();
861		1035
862	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1036	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
863	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1037	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1038
		1039	if (connectmode == conf_node::C_DISABLED)
		1040	return;
864		1041
865	switch (pkt->typ ())	1042	switch (pkt->typ ())
866	{	1043	{
867	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
868	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
869	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
870	// when we receive a ping.	1049	// when we receive a ping.
871	if (!ictx)	1050	if (!ictx)
872	{	1051	{
873	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
874	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
875	}	1054	}
876	else	1055	else
		1056	// we would love to change the socket address here, but ping's aren't
		1057	// authenticated, so we best ignore it.
877	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
878		1059
879	break;	1060	break;
880		1061
881	case vpn_packet::PT_PONG:	1062	case vpn_packet::PT_PONG:
		1063	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1064
		1065	// a PONG might mean that the other side doesn't really know
		1066	// about our desire for communication.
		1067	establish_connection ();
882	break;	1068	break;
883		1069
884	case vpn_packet::PT_RESET:	1070	case vpn_packet::PT_RESET:
		1071	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1072
		1073	if (ictx && octx)
885	{	1074	{
886	reset_connection ();	1075	reset_connection ("remote reset");
887		1076
888	config_packet *p = (config_packet *) pkt;	1077	config_packet *p = (config_packet *) pkt;
889		1078
890	if (!p->chk_config ())	1079	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
891	{
892	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
893	conf->nodename, (const char *)rsi);
894	connectmode = conf_node::C_DISABLED;
895	}
896	else if (connectmode == conf_node::C_ALWAYS)
897	establish_connection ();	1080	establish_connection ();
898	}	1081	}
		1082
899	break;	1083	break;
900		1084
901	case vpn_packet::PT_AUTH_REQ:	1085	case vpn_packet::PT_AUTH_REQ:
902	if (auth_rate_limiter.can (rsi))	1086	if (auth_rate_limiter.can (rsi))
903	{	1087	{
904	auth_req_packet *p = (auth_req_packet *) pkt;	1088	auth_req_packet *p = (auth_req_packet *)pkt;
905		1089
906	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1090	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1091	conf->nodename, p->initiate ? "initiate" : "reply",
		1092	p->protocols, p->features);
907		1093
908	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1094	if (memcmp (p->magic, MAGIC, 8))
		1095	{
		1096	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1097	conf->nodename, (const char *)rsi);
		1098	}
		1099	else if (p->chk_config (conf, rsi))
909	{	1100	{
910	if (p->prot_minor != PROTOCOL_MINOR)	1101	if (p->prot_minor != PROTOCOL_MINOR)
911	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1102	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
912	conf->nodename, (const char *)rsi,	1103	conf->nodename, (const char *)rsi,
913	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1104	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
914		1105
915	if (p->initiate)	1106	if (p->initiate)
		1107	{
916	send_auth_request (rsi, false);	1108	send_auth_request (rsi, false);
917		1109
918	rsachallenge k;	1110	if (ictx && octx)
		1111	reset_connection ("reconnect");
		1112	}
919		1113
		1114	auth_data auth;
		1115
920	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1116	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
921	{	1117	{
922	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1118	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
923	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1119	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
924	break;
925	}	1120	}
926	else	1121	else
927	{	1122	{
928	delete octx;	1123	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
929		1124
930	octx = new crypto_ctx (k, 1);	1125	rcv_auth = auth;
931	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1126	have_rcv_auth = true;
932		1127
933	// compatibility code, remove when no longer required	1128	send_auth_response (rsi);
934	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
935		1129
		1130	if (chg)
		1131	{
936	conf->protocols = p->protocols;	1132	conf->protocols = p->protocols;
937	features = p->features & config_packet::get_features ();	1133	features = p->features & config_packet::get_features ();
938		1134
939	send_auth_response (rsi, p->id, k);
940
941	connection_established ();	1135	connection_established (rsi);
942
943	break;	1136	}
944	}	1137	}
		1138
		1139	break;
945	}	1140	}
946	else
947	slog (L_WARN, _("%s(%s): protocol mismatch"),
948	conf->nodename, (const char *)rsi);
949		1141
950	send_reset (rsi);	1142	send_reset (rsi);
951	}	1143	}
952		1144
953	break;	1145	break;
954		1146
955	case vpn_packet::PT_AUTH_RES:	1147	case vpn_packet::PT_AUTH_RES:
956	{	1148	{
957	auth_res_packet *p = (auth_res_packet *) pkt;	1149	auth_res_packet *p = (auth_res_packet *)pkt;
958		1150
959	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1151	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
960		1152
961	if (p->chk_config ())	1153	auth_mac local_mac;
		1154	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1155
		1156	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
962	{	1157	{
963	if (p->prot_minor != PROTOCOL_MINOR)
964	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
965	conf->nodename, (const char *)rsi,
966	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
967
968	rsachallenge chg;
969
970	if (!rsa_cache.find (p->id, chg))
971	{
972	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1158	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
973	conf->nodename, (const char *)rsi);	1159	conf->nodename, (const char *)rsi);
974	break;
975	}	1160	}
976	else	1161	else if (!have_snd_auth)
977	{	1162	{
978	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1163	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
979		1164
980	if (!p->hmac_chk (cctx))	1165	have_snd_auth = true;
981	{
982	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
983	"could be an attack, or just corruption or a synchronization error"),
984	conf->nodename, (const char *)rsi);
985	break;
986	}
987	else
988	{
989	rsaresponse h;
990
991	rsa_hash (p->id, chg, h);
992
993	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
994	{
995	prot_minor = p->prot_minor;
996
997	delete ictx; ictx = cctx;
998
999	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1000
1001	si = rsi;
1002	protocol = rsi.prot;
1003
1004	connection_established ();	1166	connection_established (rsi);
1005
1006	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1007	conf->nodename, (const char *)rsi,
1008	p->prot_major, p->prot_minor);
1009
1010	if (::conf.script_node_up)
1011	run_script (run_script_cb (this, &connection::script_node_up), false);
1012
1013	break;
1014	}
1015	else
1016	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1017	conf->nodename, (const char *)rsi);
1018	}
1019
1020	delete cctx;
1021	}
1022	}	1167	}
1023	}	1168	}
1024
1025	send_reset (rsi);
1026	break;	1169	break;
1027		1170
1028	case vpn_packet::PT_DATA_COMPRESSED:	1171	case vpn_packet::PT_DATA_COMPRESSED:
1029	#if !ENABLE_COMPRESSION	1172	#if !ENABLE_COMPRESSION
1030	send_reset (rsi);	1173	send_reset (rsi);
…		…
1036	if (ictx && octx)	1179	if (ictx && octx)
1037	{	1180	{
1038	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
1039		1182
1040	if (!p->hmac_chk (ictx))	1183	if (!p->hmac_chk (ictx))
		1184	{
		1185	// rekeying often creates temporary hmac auth floods
		1186	// we assume they don't take longer than a few seconds normally,
		1187	// and suppress messages and resets during that time.
		1188	//TODO: should be done per source address
		1189	if (!hmac_error)
		1190	{
		1191	hmac_error = ev_now () + 3;
		1192	break;
		1193	}
		1194	else if (hmac_error >= ev_now ())
		1195	break; // silently suppress
		1196	else
		1197	{
1041	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1198	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1042	"could be an attack, or just corruption or a synchronization error"),	1199	"could be an attack, or just corruption or a synchronization error."),
1043	conf->nodename, (const char *)rsi);	1200	conf->nodename, (const char *)rsi);
		1201	// reset
		1202	}
		1203	}
1044	else	1204	else
1045	{	1205	{
1046	u32 seqno;	1206	u32 seqno;
1047	tap_packet *d = p->unpack (this, seqno);	1207	tap_packet *d = p->unpack (this, seqno);
		1208	int seqclass = iseqno.seqno_classify (seqno);
1048		1209
1049	if (iseqno.recv_ok (seqno))	1210	hmac_error = 0;
		1211
		1212	if (seqclass == 0) // ok
1050	{	1213	{
1051	vpn->tap->send (d);	1214	vpn->tap->send (d);
1052		1215
1053	if (si != rsi)	1216	if (si != rsi)
1054	{	1217	{
1055	// fast re-sync on connection changes, useful especially for tcp/ip	1218	// fast re-sync on source address changes, useful especially for tcp/ip
		1219	//if (last_si_change < ev_now () + 5.)
1056	si = rsi;	1220	// {
1057
1058	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1221	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1059	conf->nodename, (const char *)si, (const char *)rsi);	1222	conf->nodename, (const char *)si, (const char *)rsi);
		1223
		1224	si = rsi;
		1225
		1226	if (::conf.script_node_change)
		1227	{
		1228	run_script_cb *cb = new run_script_cb;
		1229	cb->set<connection, &connection::script_node_change> (this);
		1230	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1231	}
		1232
		1233	// }
		1234	//else
		1235	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1236	// conf->nodename, (const char *)si, (const char *)rsi);
1060	}	1237	}
		1238	}
		1239	else if (seqclass == 1) // far history
		1240	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1241	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1242	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1243	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1244	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1245	else if (seqclass == 3) // reset
		1246	{
		1247	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1248	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1249	send_reset (rsi);
1061	}	1250	}
1062		1251
1063	delete d;	1252	delete d;
1064	break;	1253	break;
1065	}	1254	}
…		…
1069	break;	1258	break;
1070		1259
1071	case vpn_packet::PT_CONNECT_REQ:	1260	case vpn_packet::PT_CONNECT_REQ:
1072	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1261	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1073	{	1262	{
1074	connect_req_packet *p = (connect_req_packet *) pkt;	1263	connect_req_packet *p = (connect_req_packet *)pkt;
1075		1264
1076	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1265	if (p->id > 0 && p->id <= vpn->conns.size ())
1077	connection *c = vpn->conns[p->id - 1];
1078	conf->protocols = p->protocols;
1079
1080	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1081	conf->id, p->id, c->ictx && c->octx);
1082
1083	if (c->ictx && c->octx)
1084	{	1266	{
		1267	connection *c = vpn->conns[p->id - 1];
		1268	conf->protocols = p->protocols;
		1269
		1270	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1271	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1272	p->protocols,
		1273	c->ictx && c->octx);
		1274
		1275	if (c->ictx && c->octx)
		1276	{
1085	// send connect_info packets to both sides, in case one is	1277	// send connect_info packets to both sides, in case one is
1086	// behind a nat firewall (or both ;)	1278	// behind a nat firewall (or both ;)
1087	c->send_connect_info (conf->id, si, conf->protocols);	1279	c->send_connect_info (conf->id, si, conf->protocols);
1088	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1280	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1281	}
		1282	else
		1283	c->establish_connection ();
1089	}	1284	}
1090	else	1285	else
1091	c->establish_connection ();	1286	slog (L_WARN,
		1287	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1288	p->id);
1092	}	1289	}
1093		1290
1094	break;	1291	break;
1095		1292
1096	case vpn_packet::PT_CONNECT_INFO:	1293	case vpn_packet::PT_CONNECT_INFO:
1097	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1294	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1098	{	1295	{
1099	connect_info_packet *p = (connect_info_packet *) pkt;	1296	connect_info_packet *p = (connect_info_packet *)pkt;
1100		1297
1101	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1298	if (p->id > 0 && p->id <= vpn->conns.size ())
1102		1299	{
1103	connection *c = vpn->conns[p->id - 1];	1300	connection *c = vpn->conns[p->id - 1];
1104		1301
1105	c->conf->protocols = p->protocols;	1302	c->conf->protocols = p->protocols;
1106	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1303	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1107	p->si.upgrade_protocol (protocol, c->conf);	1304	p->si.upgrade_protocol (protocol, c->conf);
1108		1305
1109	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1306	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1110	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1307	conf->nodename,
		1308	vpn->conns[p->id - 1]->conf->nodename,
		1309	(const char *)p->si,
		1310	p->protocols,
		1311	protocol,
		1312	p->si.supported_protocols (c->conf),
		1313	!c->ictx && !c->octx);
1111		1314
1112	const sockinfo &dsi = forward_si (p->si);	1315	const sockinfo &dsi = forward_si (p->si);
1113		1316
1114	if (dsi.valid ())	1317	if (dsi.valid ())
1115	c->send_auth_request (dsi, true);	1318	c->send_auth_request (dsi, true);
		1319	else
		1320	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1321	vpn->conns[p->id - 1]->conf->nodename,
		1322	(const char *)p->si);
		1323	}
		1324	else
		1325	slog (L_WARN,
		1326	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1327	p->id);
1116	}	1328	}
1117		1329
1118	break;	1330	break;
1119		1331
1120	default:	1332	default:
1121	send_reset (rsi);	1333	send_reset (rsi);
1122	break;	1334	break;
1123	}	1335	}
1124	}	1336	}
1125		1337
1126	void connection::keepalive_cb (time_watcher &w)	1338	inline void
		1339	connection::keepalive_cb (ev::timer &w, int revents)
1127	{	1340	{
1128	if (NOW >= last_activity + ::conf.keepalive + 30)	1341	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1342
		1343	if (when >= 0)
		1344	w.start (when);
		1345	else if (when < -15)
1129	{	1346	{
1130	reset_connection ();	1347	reset_connection ("keepalive overdue");
1131	establish_connection ();	1348	establish_connection ();
1132	}	1349	}
1133	else if (NOW < last_activity + ::conf.keepalive)
1134	w.start (last_activity + ::conf.keepalive);
1135	else if (conf->connectmode != conf_node::C_ONDEMAND	1350	else if (conf->connectmode != conf_node::C_ONDEMAND
1136	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1351	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1137	{	1352	{
		1353	w.start (3);
1138	send_ping (si);	1354	send_ping (si);
1139	w.start (NOW + 5);
1140	}	1355	}
1141	else if (NOW < last_activity + ::conf.keepalive + 10)	1356	else if (when >= -10)
1142	// hold ondemand connections implicitly a few seconds longer	1357	// hold ondemand connections implicitly a few seconds longer
1143	// should delete octx, though, or something like that ;)	1358	// should delete octx, though, or something like that ;)
1144	w.start (last_activity + ::conf.keepalive + 10);	1359	w.start (when + 10);
1145	else	1360	else
1146	reset_connection ();	1361	reset_connection ("keepalive timeout");
1147	}	1362	}
1148		1363
		1364	void
1149	void connection::send_connect_request (int id)	1365	connection::send_connect_request (int id)
1150	{	1366	{
1151	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1367	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1152		1368
1153	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1369	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1370	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1371	THISNODE->protocols);
1154	p->hmac_set (octx);	1372	p->hmac_set (octx);
1155	send_vpn_packet (p, si);	1373	send_vpn_packet (p, si);
1156		1374
1157	delete p;	1375	delete p;
1158	}	1376	}
1159		1377
1160	void connection::script_node ()	1378	void
		1379	connection::script_init_env (const char *ext)
1161	{	1380	{
1162	vpn->script_if_up ();
1163
1164	char *env;	1381	char *env;
		1382	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1383	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1384	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1385	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1386	conf->id & 0xff); putenv (env);
		1387	}
		1388
		1389	void
		1390	connection::script_init_connect_env ()
		1391	{
		1392	vpn->script_init_env ();
		1393
		1394	char *env;
1165	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1395	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1396	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1166	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1397	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1167	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1398	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1168	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1399	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1169	}	1400	}
1170		1401
		1402	inline const char *
1171	const char *connection::script_node_up ()	1403	connection::script_node_up ()
1172	{	1404	{
1173	script_node ();	1405	script_init_connect_env ();
1174		1406
1175	putenv ("STATE=up");	1407	putenv ((char *)"STATE=up");
1176		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
1177	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1413	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1178	}
1179		1414
		1415	return filename;
		1416	}
		1417
		1418	inline const char *
		1419	connection::script_node_change ()
		1420	{
		1421	script_init_connect_env ();
		1422
		1423	putenv ((char *)"STATE=change");
		1424
		1425	char *filename;
		1426	asprintf (&filename,
		1427	"%s/%s",
		1428	confbase,
		1429	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1430
		1431	return filename;
		1432	}
		1433
		1434	inline const char *
1180	const char *connection::script_node_down ()	1435	connection::script_node_down ()
1181	{	1436	{
1182	script_node ();	1437	script_init_connect_env ();
1183		1438
1184	putenv ("STATE=down");	1439	putenv ((char *)"STATE=down");
1185		1440
1186	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1441	char *filename;
1187	}	1442	asprintf (&filename,
		1443	"%s/%s",
		1444	confbase,
		1445	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1188		1446
		1447	return filename;
		1448	}
		1449
1189	connection::connection(struct vpn *vpn_)	1450	connection::connection (struct vpn *vpn, conf_node *conf)
1190	: vpn(vpn_)	1451	: vpn(vpn), conf(conf),
1191	, rekey (this, &connection::rekey_cb)	1452	#if ENABLE_DNS
1192	, keepalive (this, &connection::keepalive_cb)	1453	dns (0),
		1454	#endif
		1455	data_queue(conf->max_ttl, conf->max_queue + 1),
		1456	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1457	{
		1458	rekey .set<connection, &connection::rekey_cb > (this);
		1459	keepalive .set<connection, &connection::keepalive_cb > (this);
1193	, establish_connection (this, &connection::establish_connection_cb)	1460	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1194	{	1461
		1462	last_establish_attempt = 0.;
1195	octx = ictx = 0;	1463	octx = ictx = 0;
1196	retry_cnt = 0;
1197		1464
1198	connectmode = conf_node::C_ALWAYS; // initial setting	1465	connectmode = conf->connectmode;
		1466
		1467	// queue a dummy packet to force an initial connection attempt
		1468	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1469	vpn_queue.put (new net_packet);
		1470
1199	reset_connection ();	1471	reset_connection ("startup");
1200	}	1472	}
1201		1473
1202	connection::~connection ()	1474	connection::~connection ()
1203	{	1475	{
1204	shutdown ();	1476	shutdown ();
1205	}	1477	}
1206		1478
		1479	void
1207	void connection_init ()	1480	connection_init ()
1208	{	1481	{
1209	auth_rate_limiter.clear ();	1482	auth_rate_limiter.clear ();
1210	reset_rate_limiter.clear ();	1483	reset_rate_limiter.clear ();
1211	}	1484	}
1212		1485

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