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Comparing gvpe/src/connection.C (file contents):
Revision 1.7 by pcg, Sat Apr 5 17:54:22 2003 UTC vs.
Revision 1.109 by root, Fri Oct 11 07:56:07 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
		38	#include <openssl/opensslv.h>
27	#include <openssl/rand.h>	39	#include <openssl/rand.h>
28	#include <openssl/evp.h>	40	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
30	#include <openssl/err.h>	42	#include <openssl/err.h>
31		43
32	#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
33		50
34	#include "conf.h"	51	#include "conf.h"
35	#include "slog.h"	52	#include "slog.h"
36	#include "device.h"	53	#include "device.h"
37	#include "vpn.h"	54	#include "vpn.h"
38	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
39		57
40	#if !HAVE_RAND_PSEUDO_BYTES	58	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		59
44	#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
		62
		63	#define ULTRA_FAST 1
		64	#define HLOG 15
		65	#include "lzf/lzf.h"
		66	#include "lzf/lzf_c.c"
		67	#include "lzf/lzf_d.c"
		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	//////////////////////////////////////////////////////////////////////////////
45		112
46	struct crypto_ctx	113	struct crypto_ctx
47	{	114	{
48	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	116	HMAC_CTX hctx;
50		117
51	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);
52	~crypto_ctx ();	119	~crypto_ctx ();
53	};	120	};
54		121
55	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)
56	{	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
57	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	154	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	155	}
62		156
63	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
64	{	158	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
67	}	161	}
68		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
69	static void	190	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	192	{
72	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	197	}
81		198
82	struct rsa_entry {	199	void
83	tstamp expire;	200	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	201	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	203	{
		204	// request data
		205	rand_fill (snd_auth.rsa);
		206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		207
132	} rsa_cache;	208	// eventual response data
133		209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	210	}
140	w.at = NOW + RSA_TTL;
141		211
142	for (iterator i = begin (); i != end (); )	212	// every use prolongs the expiry
143	if (i->expire <= NOW)	213	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	214	}
149		215
150	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
151		217
152	void pkt_queue::put (tap_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
153	{	220	{
154	if (queue[i])	221	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		222
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	223	i = 0;
182	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	227	}
184		228
185	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
186	{	230	{
187	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
188	delete queue[i];	234	delete [] queue;
189	}	235	}
190		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
191	struct net_rateinfo {	293	struct net_rateinfo
		294	{
192	u32 host;	295	u32 host;
193	double pcnt, diff;	296	double pcnt, diff;
194	tstamp last;	297	tstamp last;
195	};	298	};
196		299
197	// 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.
198	// this implementation ("splay list" ;) is inefficient,	301	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	302	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	303	struct net_rate_limiter : list<net_rateinfo>
201	{	304	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	305	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	306	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	307	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		308	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		309
206	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	311	bool can (u32 host);
208	};	312	};
209		313
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		315
		316	bool
212	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
213	{	318	{
214	iterator i;	319	iterator i;
215		320
216	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
217	if (i->host == host)	322	if (i->host == host)
218	break;	323	break;
219	else if (i->last < NOW - EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	325	i = erase (i);
221	else	326	else
222	i++;	327	i++;
223		328
224	if (i == end ())	329	if (i == end ())
225	{	330	{
226	net_rateinfo ri;	331	net_rateinfo ri;
227		332
228	ri.host = host;	333	ri.host = host;
229	ri.pcnt = 1.;	334	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	335	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	336	ri.last = ev_now ();
232		337
233	push_front (ri);	338	push_front (ri);
234		339
235	return true;	340	return true;
236	}	341	}
237	else	342	else
238	{	343	{
239	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
240	erase (i);	345	erase (i);
241		346
242	ri.pcnt = ri.pcnt * ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		349
245	ri.last = NOW;	350	ri.last = ev_now ();
246		351
		352	double dif = ri.diff / ri.pcnt;
		353
247	bool send = ri.diff / ri.pcnt > CUTOFF;	354	bool send = dif > NRL_CUTOFF;
248		355
		356	if (dif > NRL_MAXDIF)
		357	{
		358	ri.pcnt = 1.;
		359	ri.diff = NRL_MAXDIF;
		360	}
249	if (send)	361	else if (send)
250	ri.pcnt++;	362	ri.pcnt++;
251		363
252	push_front (ri);	364	push_front (ri);
253		365
254	return send;	366	return send;
255	}	367	}
256	}	368	}
257		369
258	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
259		371
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
261
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
263	{	374	{
264	unsigned int xlen;
265
266	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
267		376
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
270	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
272	}	380	}
273		381
274	void	382	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	384	{
277	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
278		386	hmac_gen (ctx, hmac_digest);
279	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
280	}	388	}
281		389
282	bool	390	bool
283	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
284	{	392	{
285	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		394	hmac_gen (ctx, hmac_digest);
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	396	}
289		397
		398	void
290	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	400	{
292	type = type_;	401	type = type_;
293		402
294	int src = THISNODE->id;	403	int src = THISNODE->id;
295		404
…		…
299	}	408	}
300		409
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		412
304	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
305	{	422	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307
308	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
309	tap_packet *unpack (connection *conn, u32 &seqno);
310	private:
311
312	const u32 data_hdr_size () const
313	{
314	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	424	}
		425	};
317		426
318	void	427	void
319	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)
320	{	429	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	431	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
324		433
325	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
327	u32 cl;
328		436
		437	if (conn->features & FEATURE_COMPRESSION)
		438	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		440
330	if (cl)	441	if (cl)
331	{	442	{
332	type = PT_DATA_COMPRESSED;	443	type = PT_DATA_COMPRESSED;
333	d = cdata;	444	d = cdata;
334	l = cl + 2;	445	l = cl + 2;
335		446
336	d[0] = cl >> 8;	447	d[0] = cl >> 8;
337	d[1] = cl;	448	d[1] = cl;
		449	}
338	}	450	}
339	#endif	451	#endif
340		452
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		454
343	struct {	455	struct {
344	#if RAND_SIZE	456	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
346	#endif	458	#endif
347	u32 seqno;	459	u32 seqno;
348	} datahdr;	460	} datahdr;
349		461
350	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	463	#if RAND_SIZE
352	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);
353	#endif	467	#endif
354		468
355	EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	472	outl += outl2;
359		473
360	EVP_EncryptUpdate (cctx,	474	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	475	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	476	(unsigned char *) d, l));
363	outl += outl2;	477	outl += outl2;
364		478
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	479	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	480	outl += outl2;
367		481
368	len = outl + data_hdr_size ();	482	len = outl + data_hdr_size ();
369		483
370	set_hdr (type, dst);	484	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	493	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
381	u8 *d;	495	u8 *d;
382	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
383		497
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		499
386	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
388		502
389	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	504	d = cdata;
391	else	505	else
392	#endif	506	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
394		508
395	/* 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
396	EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	517	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	518	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	519	outl += outl2;
400		520
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	521	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	522	outl += outl2;
403		523
404	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	524	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
405		525
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	551	}
432	};	552	};
433		553
434	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
435	{	555	{
436	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
437	// field comes before this data, so peers with other
438	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
442		560
443	const u8 curflags () const	561	void setup (ptype type, int dst);
		562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		563
		564	static u8 get_features ()
444	{	565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f |= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f |= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
445	return 0x80	576	return f;
446	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}	577	}
448
449	void setup (ptype type, int dst);
450	bool chk_config () const;
451	};	578	};
452		579
		580	void
453	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
454	{	582	{
455	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	586	flags = 0;
459	flags = curflags ();	587	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	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 ()));
465		594
466	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	596	set_hdr (type, dst);
468	}	597	}
469		598
470	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
471	{	601	{
472	return prot_major == PROTOCOL_MAJOR	602	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
474	&& hmaclen == HMACLENGTH	604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
475	&& flags == curflags ()	605	else if (randsize != RAND_SIZE)
476	&& challengelen == sizeof (rsachallenge)	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
480	}	611	else if (mac_nid != htonl (EVP_MD_type (MAC_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 ()));
		617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
481		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)
		625	return true;
		626	}
		627
		628	return false;
		629	}
		630
482	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
483	{	632	{
484	char magic[8];	633	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	636	u8 pad2, pad3;
488	rsaid id;	637	auth_encr encr;
489	rsaencrdata encr;
490		638
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	640	{
493	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	643	initiate = !!initiate_;
496	protocols = protocols_;	644	protocols = protocols_;
497		645
498	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
499	}	647	}
500	};	648	};
501		649
502	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
503	{	651	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	652	auth_response response;
508		653
509	auth_res_packet (int dst)	654	auth_res_packet (int dst)
510	{	655	{
511	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
512		657
513	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
514	}	659	}
515	};	660	};
516		661
…		…
546	};	691	};
547		692
548	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
549		694
550	void	695	void
		696	connection::connection_established (const sockinfo &rsi)
		697	{
		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."));
		714	}
		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);
		718
		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
		730	keepalive.start (::conf.keepalive);
		731
		732	// send queued packets
		733	while (tap_packet *p = (tap_packet *)data_queue.get ())
		734	{
		735	if (p->len) send_data_packet (p);
		736	delete p;
		737	}
		738
		739	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		740	{
		741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		742	delete p;
		743	}
		744
		745	vpn->connection_established (this);
		746	}
		747
		748	void
551	connection::reset_dstaddr ()	749	connection::reset_si ()
552	{	750	{
		751	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	752	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		753	else
555	// mask out protocols we cannot establish	754	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	756	protocol = 0;
		757	}
558		758
559	si.set (conf, protocol);	759	si.set (conf, protocol);
560	}	760	}
561		761
562	void	762	// ensure sockinfo is valid, forward if necessary
563	connection::send_ping (const sockinfo &si, u8 pong)	763	const sockinfo &
564	{
565	ping_packet *pkt = new ping_packet;
566
567	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
568	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
569
570	delete pkt;
571	}
572
573	void
574	connection::send_reset (const sockinfo &si)	764	connection::forward_si (const sockinfo &si) const
575	{	765	{
576	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	766	if (!si.valid ())
577	{
578	config_packet *pkt = new config_packet;
579
580	pkt->setup (vpn_packet::PT_RESET, conf->id);
581	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);
582
583	delete pkt;
584	}	767	{
585	}	768	connection *r = vpn->find_router_for (this);
586		769
587	void	770	if (r)
588	connection::send_auth_request (const sockinfo &si, bool initiate)
589	{
590	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
591
592	rsachallenge chg;
593
594	rsa_cache.gen (pkt->id, chg);
595
596	if (0 > RSA_public_encrypt (sizeof chg,
597	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
598	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
599	fatal ("RSA_public_encrypt error");
600
601	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
602
603	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
604
605	delete pkt;
606	}
607
608	void
609	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
610	{
611	auth_res_packet *pkt = new auth_res_packet (conf->id);
612
613	pkt->id = id;
614
615	rsa_hash (id, chg, pkt->response);
616
617	pkt->hmac_set (octx);
618
619	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
620
621	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
622
623	delete pkt;
624	}
625
626	void
627	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
628	{
629	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
630	conf->id, rid, (const char *)rsi);
631
632	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
633
634	r->hmac_set (octx);
635	vpn->send_vpn_packet (r, si);
636
637	delete r;
638	}
639
640	void
641	connection::establish_connection_cb (time_watcher &w)
642	{
643	if (ictx || conf == THISNODE
644	|| connectmode == conf_node::C_NEVER
645	|| connectmode == conf_node::C_DISABLED)
646	w.at = TSTAMP_CANCEL;
647	else if (w.at <= NOW)
648	{
649	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
650
651	if (retry_int < 3600 * 8)
652	retry_cnt++;
653
654	w.at = NOW + retry_int;
655
656	if (conf->hostname)
657	{	771	{
658	reset_dstaddr ();	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659		773	conf->nodename, r->conf->nodename);
660	if (si.valid () && auth_rate_limiter.can (si))	774	return r->si;
661	{
662	if (retry_cnt < 4)
663	send_auth_request (si, true);
664	else
665	send_ping (si, 0);
666	}
667	}	775	}
668	else	776	else
669	vpn->connect_request (conf->id);	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		778	conf->nodename);
		779	}
		780
		781	return si;
		782	}
		783
		784	void
		785	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		786	{
		787	if (!vpn->send_vpn_packet (pkt, si, tos))
		788	reset_connection ("packet send error");
		789	}
		790
		791	void
		792	connection::send_ping (const sockinfo &si, u8 pong)
		793	{
		794	ping_packet *pkt = new ping_packet;
		795
		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);
		799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		800
		801	delete pkt;
		802	}
		803
		804	void
		805	connection::send_reset (const sockinfo &si)
		806	{
		807	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
670	}	808	{
671	}	809	config_packet *pkt = new config_packet;
672		810
		811	pkt->setup (vpn_packet::PT_RESET, conf->id);
		812	send_vpn_packet (pkt, si, IPTOS_MINCOST);
		813
		814	delete pkt;
		815	}
		816	}
		817
673	void	818	void
		819	connection::send_auth_request (const sockinfo &si, bool initiate)
		820	{
		821	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		822
		823	generate_auth_data ();
		824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
		825
		826	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
		827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
		828
		829	delete pkt;
		830	}
		831
		832	void
		833	connection::send_auth_response (const sockinfo &si)
		834	{
		835	auth_res_packet *pkt = new auth_res_packet (conf->id);
		836
		837	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		838	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
		839
		840	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
		841	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		842
		843	delete pkt;
		844	}
		845
		846	void
		847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
		848	{
		849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
		850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
		852
		853	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
		854
		855	r->hmac_set (octx);
		856	send_vpn_packet (r, si);
		857
		858	delete r;
		859	}
		860
		861	inline void
		862	connection::establish_connection_cb (ev::timer &w, int revents)
		863	{
		864	if (!(ictx && octx)
		865	&& conf != THISNODE
		866	&& connectmode != conf_node::C_NEVER
		867	&& connectmode != conf_node::C_DISABLED
		868	&& !w.is_active ())
		869	{
		870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		871	// and stop trying. should probably be handled by a per-connection expire handler.
		872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
		875	return;
		876	}
		877
		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));
		883
		884	reset_si ();
		885
		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);
		892	vpn->send_connect_request (this);
		893	}
		894	else
		895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
		900	const sockinfo &dsi = forward_si (si);
		901
		902	slow = slow || (dsi.prot & PROT_SLOW);
		903
		904	if (dsi.valid () && auth_rate_limiter.can (dsi))
		905	{
		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))
		910	send_auth_request (dsi, true);
		911	else
		912	send_ping (dsi, 0);
		913	}
		914	}
		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
		927	void
674	connection::reset_connection ()	928	connection::reset_connection (const char *reason)
675	{	929	{
676	if (ictx && octx)	930	if (ictx && octx)
677	{	931	{
678	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost (%s)"),
679	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si, reason);
680		934
681	if (::conf.script_node_down)	935	if (::conf.script_node_down)
682	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	}
683	}	941	}
684		942
685	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
686	delete octx; octx = 0;	944	delete octx; octx = 0;
687		945
688	si.host= 0;	946	si.host = 0;
689		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
690	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
691	retry_cnt = 0;	954	retry_cnt = 0;
692		955
693	rekey.reset ();	956	rekey.stop ();
694	keepalive.reset ();	957	keepalive.stop ();
695	establish_connection.reset ();	958	establish_connection.stop ();
696	}	959	}
697		960
698	void	961	void
699	connection::shutdown ()	962	connection::shutdown ()
700	{	963	{
701	if (ictx && octx)	964	if (ictx && octx)
702	send_reset (si);	965	send_reset (si);
703		966
704	reset_connection ();	967	reset_connection ("shutdown");
705	}	968	}
706		969
707	void	970	// poor-man's rekeying
708	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
709	{	973	{
710	w.at = TSTAMP_CANCEL;
711
712	reset_connection ();	974	reset_connection ("rekeying");
713	establish_connection ();	975	establish_connection ();
714	}	976	}
715		977
716	void	978	void
717	connection::send_data_packet (tap_packet *pkt, bool broadcast)	979	connection::send_data_packet (tap_packet *pkt)
718	{	980	{
719	vpndata_packet *p = new vpndata_packet;	981	vpndata_packet *p = new vpndata_packet;
720	int tos = 0;	982	int tos = 0;
721		983
722	if (conf->inherit_tos	984	// I am not hilarious about peeking into packets, but so be it.
723	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	985	if (conf->inherit_tos && pkt->is_ipv4 ())
724	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
725	tos = (*pkt)[15] & IPTOS_TOS_MASK;	986	tos = (*pkt)[15] & IPTOS_TOS_MASK;
726		987
727	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	988	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
728	vpn->send_vpn_packet (p, si, tos);	989	send_vpn_packet (p, si, tos);
729		990
730	delete p;	991	delete p;
731		992
732	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
733	rekey ();	994	rekey ();
734	}	995	}
735		996
736	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
737	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1008	connection::inject_data_packet (tap_packet *pkt)
738	{	1009	{
739	if (ictx && octx)	1010	if (ictx && octx)
740	send_data_packet (pkt, broadcast);	1011	send_data_packet (pkt);
741	else	1012	else
742	{	1013	{
743	if (!broadcast)//DDDD
744	queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
		1015	post_inject_queue ();
		1016	}
		1017	}
745		1018
746	establish_connection ();	1019	void
		1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1021	{
		1022	if (ictx && octx)
		1023	send_vpn_packet (pkt, si, tos);
		1024	else
		1025	{
		1026	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1027	post_inject_queue ();
747	}	1028	}
748	}	1029	}
749		1030
750	void	1031	void
751	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
752	{	1033	{
753	last_activity = NOW;	1034	last_activity = ev_now ();
754		1035
755	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.",
756	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;
757		1041
758	switch (pkt->typ ())	1042	switch (pkt->typ ())
759	{	1043	{
760	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
761	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
762	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
763	// when we receive a ping.	1049	// when we receive a ping.
764	if (!ictx)	1050	if (!ictx)
765	{	1051	{
766	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
767	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
768	}	1054	}
769	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.
770	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
771		1059
772	break;	1060	break;
773		1061
774	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 ();
775	break;	1068	break;
776		1069
777	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)
778	{	1074	{
779	reset_connection ();	1075	reset_connection ("remote reset");
780		1076
781	config_packet *p = (config_packet *) pkt;	1077	config_packet *p = (config_packet *) pkt;
782		1078
783	if (!p->chk_config ())	1079	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
784	{
785	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
786	conf->nodename, (const char *)rsi);
787	connectmode = conf_node::C_DISABLED;
788	}
789	else if (connectmode == conf_node::C_ALWAYS)
790	establish_connection ();	1080	establish_connection ();
791	}	1081	}
		1082
792	break;	1083	break;
793		1084
794	case vpn_packet::PT_AUTH_REQ:	1085	case vpn_packet::PT_AUTH_REQ:
795	if (auth_rate_limiter.can (rsi))	1086	if (auth_rate_limiter.can (rsi))
796	{	1087	{
797	auth_req_packet *p = (auth_req_packet *) pkt;	1088	auth_req_packet *p = (auth_req_packet *)pkt;
798		1089
799	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);
800		1093
801	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))
802	{	1100	{
803	if (p->prot_minor != PROTOCOL_MINOR)	1101	if (p->prot_minor != PROTOCOL_MINOR)
804	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."),
805	conf->nodename, (const char *)rsi,	1103	conf->nodename, (const char *)rsi,
806	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1104	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
807		1105
808	if (p->initiate)	1106	if (p->initiate)
		1107	{
809	send_auth_request (rsi, false);	1108	send_auth_request (rsi, false);
810		1109
811	rsachallenge k;	1110	if (ictx && octx)
		1111	reset_connection ("reconnect");
		1112	}
812		1113
813	if (0 > RSA_private_decrypt (sizeof (p->encr),	1114	auth_data auth;
814	(unsigned char *)&p->encr, (unsigned char *)&k,	1115
815	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1116	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1117	{
816	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1118	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
817	conf->nodename, (const char *)rsi);	1119	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1120	}
818	else	1121	else
819	{	1122	{
820	retry_cnt = 0;	1123	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
821	establish_connection.start (NOW + 8); //? ;)
822	keepalive.reset ();
823	rekey.reset ();
824		1124
825	delete ictx;
826	ictx = 0;	1125	rcv_auth = auth;
		1126	have_rcv_auth = true;
827		1127
828	delete octx;	1128	send_auth_response (rsi);
829		1129
830	octx = new crypto_ctx (k, 1);	1130	if (chg)
831	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1131	{
832
833	conf->protocols = p->protocols;	1132	conf->protocols = p->protocols;
834	send_auth_response (rsi, p->id, k);	1133	features = p->features & config_packet::get_features ();
835		1134
		1135	connection_established (rsi);
836	break;	1136	}
837	}	1137	}
		1138
		1139	break;
838	}	1140	}
839		1141
840	send_reset (rsi);	1142	send_reset (rsi);
841	}	1143	}
842		1144
843	break;	1145	break;
844		1146
845	case vpn_packet::PT_AUTH_RES:	1147	case vpn_packet::PT_AUTH_RES:
846	{	1148	{
847	auth_res_packet *p = (auth_res_packet *) pkt;	1149	auth_res_packet *p = (auth_res_packet *)pkt;
848		1150
849	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1151	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
850		1152
851	if (p->chk_config ())	1153	auth_mac local_mac;
		1154	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1155
		1156	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
852	{	1157	{
853	if (p->prot_minor != PROTOCOL_MINOR)
854	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
855	conf->nodename, (const char *)rsi,
856	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
857
858	rsachallenge chg;
859
860	if (!rsa_cache.find (p->id, chg))
861	slog (L_ERR, _("%s(%s): unrequested auth response"),	1158	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
862	conf->nodename, (const char *)rsi);	1159	conf->nodename, (const char *)rsi);
863	else
864	{
865	crypto_ctx *cctx = new crypto_ctx (chg, 0);
866
867	if (!p->hmac_chk (cctx))
868	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
869	"could be an attack, or just corruption or an synchronization error"),
870	conf->nodename, (const char *)rsi);
871	else
872	{
873	rsaresponse h;
874
875	rsa_hash (p->id, chg, h);
876
877	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
878	{
879	prot_minor = p->prot_minor;
880
881	delete ictx; ictx = cctx;
882
883	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
884
885	si = rsi;
886	protocol = rsi.prot;
887
888	rekey.start (NOW + ::conf.rekey);
889	keepalive.start (NOW + ::conf.keepalive);
890
891	// send queued packets
892	while (tap_packet *p = queue.get ())
893	{
894	send_data_packet (p);
895	delete p;
896	}
897
898	connectmode = conf->connectmode;
899
900	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
901	conf->nodename, (const char *)rsi,
902	p->prot_major, p->prot_minor);
903
904	if (::conf.script_node_up)
905	run_script (run_script_cb (this, &connection::script_node_up), false);
906
907	break;
908	}
909	else
910	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
911	conf->nodename, (const char *)rsi);
912	}
913
914	delete cctx;
915	}	1160	}
		1161	else if (!have_snd_auth)
		1162	{
		1163	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1164
		1165	have_snd_auth = true;
		1166	connection_established (rsi);
916	}	1167	}
917	}	1168	}
918
919	send_reset (rsi);
920	break;	1169	break;
921		1170
922	case vpn_packet::PT_DATA_COMPRESSED:	1171	case vpn_packet::PT_DATA_COMPRESSED:
923	#if !ENABLE_COMPRESSION	1172	#if !ENABLE_COMPRESSION
924	send_reset (rsi);	1173	send_reset (rsi);
…		…
929		1178
930	if (ictx && octx)	1179	if (ictx && octx)
931	{	1180	{
932	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
933		1182
934	if (rsi == si)	1183	if (!p->hmac_chk (ictx))
935	{	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
936	if (!p->hmac_chk (ictx))	1189	if (!hmac_error)
937	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1190	{
938	"could be an attack, or just corruption or an synchronization error"),	1191	hmac_error = ev_now () + 3;
939	conf->nodename, (const char *)rsi);	1192	break;
		1193	}
		1194	else if (hmac_error >= ev_now ())
		1195	break; // silently suppress
940	else	1196	else
941	{	1197	{
942	u32 seqno;	1198	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
943	tap_packet *d = p->unpack (this, seqno);	1199	"could be an attack, or just corruption or a synchronization error."),
944		1200	conf->nodename, (const char *)rsi);
945	if (iseqno.recv_ok (seqno))
946	{	1201	// reset
947	vpn->tap->send (d);
948
949	if (p->dst () == 0) // re-broadcast
950	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
951	{
952	connection *c = *i;
953
954	if (c->conf != THISNODE && c->conf != conf)
955	c->inject_data_packet (d);
956	}
957
958	delete d;
959
960	break;
961	}
962	}	1202	}
963	}	1203	}
964	else	1204	else
965	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);	1205	{
		1206	u32 seqno;
		1207	tap_packet *d = p->unpack (this, seqno);
		1208	int seqclass = iseqno.seqno_classify (seqno);
		1209
		1210	hmac_error = 0;
		1211
		1212	if (seqclass == 0) // ok
		1213	{
		1214	vpn->tap->send (d);
		1215
		1216	if (si != rsi)
		1217	{
		1218	// fast re-sync on source address changes, useful especially for tcp/ip
		1219	//if (last_si_change < ev_now () + 5.)
		1220	// {
		1221	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		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);
		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);
		1250	}
		1251
		1252	delete d;
		1253	break;
		1254	}
966	}	1255	}
967		1256
968	send_reset (rsi);	1257	send_reset (rsi);
969	break;	1258	break;
970		1259
971	case vpn_packet::PT_CONNECT_REQ:	1260	case vpn_packet::PT_CONNECT_REQ:
972	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1261	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
973	{	1262	{
974	connect_req_packet *p = (connect_req_packet *) pkt;	1263	connect_req_packet *p = (connect_req_packet *)pkt;
975		1264
976	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 ())
977	connection *c = vpn->conns[p->id - 1];
978	conf->protocols = p->protocols;
979
980	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
981	conf->id, p->id, c->ictx && c->octx);
982
983	if (c->ictx && c->octx)
984	{	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	{
985	// send connect_info packets to both sides, in case one is	1277	// send connect_info packets to both sides, in case one is
986	// behind a nat firewall (or both ;)	1278	// behind a nat firewall (or both ;)
987	c->send_connect_info (conf->id, si, conf->protocols);	1279	c->send_connect_info (conf->id, si, conf->protocols);
988	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 ();
989	}	1284	}
		1285	else
		1286	slog (L_WARN,
		1287	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1288	p->id);
990	}	1289	}
991		1290
992	break;	1291	break;
993		1292
994	case vpn_packet::PT_CONNECT_INFO:	1293	case vpn_packet::PT_CONNECT_INFO:
995	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1294	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
996	{	1295	{
997	connect_info_packet *p = (connect_info_packet *) pkt;	1296	connect_info_packet *p = (connect_info_packet *)pkt;
998		1297
999	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 ())
1000		1299	{
1001	connection *c = vpn->conns[p->id - 1];	1300	connection *c = vpn->conns[p->id - 1];
1002		1301
1003	c->conf->protocols = p->protocols;	1302	c->conf->protocols = p->protocols;
1004	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));
1005	p->si.upgrade_protocol (protocol, c->conf);	1304	p->si.upgrade_protocol (protocol, c->conf);
1006		1305
1007	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]",
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1307	conf->nodename,
1009	//slog (L_ERR, "%d PROTOCL(C%x,T%x,0S%x,S%x,P%x,SP%x)",	1308	vpn->conns[p->id - 1]->conf->nodename,
1010	// p->id, c->conf->protocols, THISNODE->protocols, p->si.supported_protocols(0), p->si.supported_protocols (c->conf),	1309	(const char *)p->si,
1011	// protocol, p->si.prot);	1310	p->protocols,
		1311	protocol,
		1312	p->si.supported_protocols (c->conf),
		1313	!c->ictx && !c->octx);
1012		1314
		1315	const sockinfo &dsi = forward_si (p->si);
		1316
		1317	if (dsi.valid ())
1013	c->send_auth_request (p->si, 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);
1014	}	1328	}
1015		1329
1016	break;	1330	break;
1017		1331
1018	default:	1332	default:
1019	send_reset (rsi);	1333	send_reset (rsi);
1020	break;	1334	break;
1021	}	1335	}
1022	}	1336	}
1023		1337
1024	void connection::keepalive_cb (time_watcher &w)	1338	inline void
		1339	connection::keepalive_cb (ev::timer &w, int revents)
1025	{	1340	{
1026	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)
1027	{	1346	{
1028	reset_connection ();	1347	reset_connection ("keepalive overdue");
1029	establish_connection ();	1348	establish_connection ();
1030	}	1349	}
1031	else if (NOW < last_activity + ::conf.keepalive)
1032	w.at = last_activity + ::conf.keepalive;
1033	else if (conf->connectmode != conf_node::C_ONDEMAND	1350	else if (conf->connectmode != conf_node::C_ONDEMAND
1034	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1351	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1035	{	1352	{
		1353	w.start (3);
1036	send_ping (si);	1354	send_ping (si);
1037	w.at = NOW + 5;
1038	}	1355	}
		1356	else if (when >= -10)
		1357	// hold ondemand connections implicitly a few seconds longer
		1358	// should delete octx, though, or something like that ;)
		1359	w.start (when + 10);
1039	else	1360	else
1040	reset_connection ();	1361	reset_connection ("keepalive timeout");
1041	}	1362	}
1042		1363
		1364	void
1043	void connection::connect_request (int id)	1365	connection::send_connect_request (int id)
1044	{	1366	{
1045	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);
1046		1368
1047	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);
1048	p->hmac_set (octx);	1372	p->hmac_set (octx);
1049	vpn->send_vpn_packet (p, si);	1373	send_vpn_packet (p, si);
1050		1374
1051	delete p;	1375	delete p;
1052	}	1376	}
1053		1377
1054	void connection::script_node ()	1378	void
		1379	connection::script_init_env (const char *ext)
1055	{	1380	{
1056	vpn->script_if_up ();
1057
1058	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;
1059	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);
1060	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1397	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1061	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1398	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1062	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1399	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1063	}	1400	}
1064		1401
		1402	inline const char *
1065	const char *connection::script_node_up ()	1403	connection::script_node_up ()
1066	{	1404	{
1067	script_node ();	1405	script_init_connect_env ();
1068		1406
1069	putenv ("STATE=up");	1407	putenv ((char *)"STATE=up");
1070		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
1071	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1413	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1072	}
1073		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 *
1074	const char *connection::script_node_down ()	1435	connection::script_node_down ()
1075	{	1436	{
1076	script_node ();	1437	script_init_connect_env ();
1077		1438
1078	putenv ("STATE=down");	1439	putenv ((char *)"STATE=down");
1079		1440
1080	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1441	char *filename;
1081	}	1442	asprintf (&filename,
		1443	"%s/%s",
		1444	confbase,
		1445	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1082		1446
		1447	return filename;
		1448	}
		1449
1083	connection::connection(struct vpn *vpn_)	1450	connection::connection (struct vpn *vpn, conf_node *conf)
1084	: vpn(vpn_)	1451	: vpn(vpn), conf(conf),
1085	, rekey (this, &connection::rekey_cb)	1452	#if ENABLE_DNS
1086	, 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);
1087	, establish_connection (this, &connection::establish_connection_cb)	1460	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1088	{	1461
		1462	last_establish_attempt = 0.;
1089	octx = ictx = 0;	1463	octx = ictx = 0;
1090	retry_cnt = 0;
1091		1464
1092	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
1093	reset_connection ();	1471	reset_connection ("startup");
1094	}	1472	}
1095		1473
1096	connection::~connection ()	1474	connection::~connection ()
1097	{	1475	{
1098	shutdown ();	1476	shutdown ();
1099	}	1477	}
1100		1478
		1479	void
1101	void connection_init ()	1480	connection_init ()
1102	{	1481	{
1103	auth_rate_limiter.clear ();	1482	auth_rate_limiter.clear ();
1104	reset_rate_limiter.clear ();	1483	reset_rate_limiter.clear ();
1105	}	1484	}
1106		1485

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