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Comparing gvpe/src/connection.C (file contents):
Revision 1.18 by pcg, Sat Oct 4 13:20:07 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 (net_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	net_packet *pkt_queue::get ()
166	{
167	net_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. / 600.; // allow bursts	305	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // 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
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	308	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		309
207	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	311	bool can (u32 host);
209	};	312	};
210		313
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		315
		316	bool
213	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
214	{	318	{
215	iterator i;	319	iterator i;
216		320
217	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
218	if (i->host == host)	322	if (i->host == host)
219	break;	323	break;
220	else if (i->last < NOW - EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	325	i = erase (i);
222	else	326	else
223	i++;	327	i++;
224		328
225	if (i == end ())	329	if (i == end ())
226	{	330	{
227	net_rateinfo ri;	331	net_rateinfo ri;
228		332
229	ri.host = host;	333	ri.host = host;
230	ri.pcnt = 1.;	334	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	335	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	336	ri.last = ev_now ();
233		337
234	push_front (ri);	338	push_front (ri);
235		339
236	return true;	340	return true;
237	}	341	}
238	else	342	else
239	{	343	{
240	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
241	erase (i);	345	erase (i);
242		346
243	ri.pcnt = ri.pcnt * ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		349
246	ri.last = NOW;	350	ri.last = ev_now ();
247		351
248	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
249		353
250	bool send = dif > CUTOFF;	354	bool send = dif > NRL_CUTOFF;
251		355
252	if (dif > MAXDIF)	356	if (dif > NRL_MAXDIF)
253	{	357	{
254	ri.pcnt = 1.;	358	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	359	ri.diff = NRL_MAXDIF;
256	}	360	}
257	else if (send)	361	else if (send)
258	ri.pcnt++;	362	ri.pcnt++;
259		363
260	push_front (ri);	364	push_front (ri);
…		…
263	}	367	}
264	}	368	}
265		369
266	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
267		371
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
269
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
271	{	374	{
272	unsigned int xlen;
273
274	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
275		376
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
278	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
280	}	380	}
281		381
282	void	382	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	384	{
285	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		386	hmac_gen (ctx, hmac_digest);
287	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
288	}	388	}
289		389
290	bool	390	bool
291	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
292	{	392	{
293	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
294		394	hmac_gen (ctx, hmac_digest);
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	396	}
297		397
		398	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	400	{
300	type = type_;	401	type = type_;
301		402
302	int src = THISNODE->id;	403	int src = THISNODE->id;
303		404
…		…
307	}	408	}
308		409
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		412
312	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
313	{	422	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315
316	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
317	tap_packet *unpack (connection *conn, u32 &seqno);
318	private:
319
320	const u32 data_hdr_size () const
321	{
322	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	424	}
		425	};
325		426
326	void	427	void
327	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)
328	{	429	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	431	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
332		433
333	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
335	u32 cl;
336		436
		437	if (conn->features & FEATURE_COMPRESSION)
		438	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		440
338	if (cl)	441	if (cl)
339	{	442	{
340	type = PT_DATA_COMPRESSED;	443	type = PT_DATA_COMPRESSED;
341	d = cdata;	444	d = cdata;
342	l = cl + 2;	445	l = cl + 2;
343		446
344	d[0] = cl >> 8;	447	d[0] = cl >> 8;
345	d[1] = cl;	448	d[1] = cl;
		449	}
346	}	450	}
347	#endif	451	#endif
348		452
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		454
351	struct {	455	struct {
352	#if RAND_SIZE	456	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
354	#endif	458	#endif
355	u32 seqno;	459	u32 seqno;
356	} datahdr;	460	} datahdr;
357		461
358	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	463	#if RAND_SIZE
360	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);
361	#endif	467	#endif
362		468
363	EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	472	outl += outl2;
367		473
368	EVP_EncryptUpdate (cctx,	474	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	475	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	476	(unsigned char *) d, l));
371	outl += outl2;	477	outl += outl2;
372		478
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	479	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	480	outl += outl2;
375		481
376	len = outl + data_hdr_size ();	482	len = outl + data_hdr_size ();
377		483
378	set_hdr (type, dst);	484	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	493	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
389	u8 *d;	495	u8 *d;
390	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
391		497
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		499
394	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
396		502
397	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	504	d = cdata;
399	else	505	else
400	#endif	506	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
402		508
403	/* 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
404	EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	517	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	518	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	519	outl += outl2;
408		520
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	521	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	522	outl += outl2;
411		523
412	seqno = ntohl (*(u32 *)(d + RAND_SIZE));	524	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
413		525
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	551	}
440	};	552	};
441		553
442	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
443	{	555	{
444	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
450		560
451	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 ()
452	{	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
453	return 0x80	576	return f;
454	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	577	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	578	};
460		579
		580	void
461	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
462	{	582	{
463	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	586	flags = 0;
467	flags = curflags ();	587	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	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 ()));
473		594
474	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	596	set_hdr (type, dst);
476	}	597	}
477		598
478	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	601	{
480	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
481	slog (L_WARN, _("major version mismatch (%d <=> %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);
482	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
483	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
484	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
485	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
486	else if (flags != curflags ())
487	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
488	else if (challengelen != sizeof (rsachallenge))
489	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
490	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
491	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
492	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
493	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
494	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
495	slog (L_WARN, _("hmac mismatch (%x <=> %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 ()));
496	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)
497	return true;	625	return true;
		626	}
498		627
499	return false;	628	return false;
500	}	629	}
501		630
502	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
503	{	632	{
504	char magic[8];	633	char magic[8];
505	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
506	u8 protocols; // supported protocols (will get patches on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
507	u8 pad2, pad3;	636	u8 pad2, pad3;
508	rsaid id;	637	auth_encr encr;
509	rsaencrdata encr;
510		638
511	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
512	{	640	{
513	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
514	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
515	initiate = !!initiate_;	643	initiate = !!initiate_;
516	protocols = protocols_;	644	protocols = protocols_;
517		645
518	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
519	}	647	}
520	};	648	};
521		649
522	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
523	{	651	{
524	rsaid id;
525	u8 pad1, pad2, pad3;
526	u8 response_len; // encrypted length
527	rsaresponse response;	652	auth_response response;
528		653
529	auth_res_packet (int dst)	654	auth_res_packet (int dst)
530	{	655	{
531	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
532		657
533	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
534	}	659	}
535	};	660	};
536		661
…		…
566	};	691	};
567		692
568	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
569		694
570	void	695	void
571	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
572	{	697	{
573	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."));
574	{	714	}
575	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);
576		718
577	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
578	keepalive.start (NOW + ::conf.keepalive);	730	keepalive.start (::conf.keepalive);
579		731
580	// send queued packets	732	// send queued packets
581	if (ictx && octx)
582	{
583	while (tap_packet *p = (tap_packet *)data_queue.get ())	733	while (tap_packet *p = (tap_packet *)data_queue.get ())
584	{	734	{
585	send_data_packet (p);	735	if (p->len) send_data_packet (p);
586	delete p;	736	delete p;
587	}	737	}
588		738
589	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	739	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
590	{	740	{
591	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
592	delete p;	742	delete p;
593	}
594	}
595	}	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 ());
596	else	753	else
597	{	754	{
598	retry_cnt = 0;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
599	establish_connection.start (NOW + 5);	756	protocol = 0;
600	keepalive.reset ();
601	rekey.reset ();
602	}	757	}
603	}
604
605	void
606	connection::reset_si ()
607	{
608	protocol = best_protocol (THISNODE->protocols & conf->protocols);
609
610	// mask out protocols we cannot establish
611	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
612	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
613		758
614	si.set (conf, protocol);	759	si.set (conf, protocol);
615	}	760	}
616		761
617	// ensure sockinfo is valid, forward if necessary	762	// ensure sockinfo is valid, forward if necessary
618	const sockinfo &	763	const sockinfo &
619	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
620	{	765	{
621	if (!si.valid ())	766	if (!si.valid ())
622	{	767	{
623	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
624		769
625	if (r)	770	if (r)
626	{	771	{
627	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
628	conf->nodename, r->conf->nodename);	773	conf->nodename, r->conf->nodename);
629	return r->si;	774	return r->si;
630	}	775	}
631	else	776	else
632	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
633	conf->nodename);	778	conf->nodename);
634	}	779	}
635		780
636	return si;	781	return si;
637	}	782	}
638		783
639	void	784	void
640	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)
641	{	786	{
642	if (!vpn->send_vpn_packet (pkt, si, tos))	787	if (!vpn->send_vpn_packet (pkt, si, tos))
643	reset_connection ();	788	reset_connection ("packet send error");
644	}	789	}
645		790
646	void	791	void
647	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
648	{	793	{
649	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
650		795
651	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);
652	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
653		800
654	delete pkt;	801	delete pkt;
655	}	802	}
656		803
…		…
671	void	818	void
672	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
673	{	820	{
674	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);
675		822
676	rsachallenge chg;	823	generate_auth_data ();
		824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
677		825
678	rsa_cache.gen (pkt->id, chg);
679
680	if (0 > RSA_public_encrypt (sizeof chg,
681	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
682	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
683	fatal ("RSA_public_encrypt error");
684
685	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);
686
687	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
688		828
689	delete pkt;	829	delete pkt;
690	}	830	}
691		831
692	void	832	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
694	{	834	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		836
697	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);
698		839
699	rsa_hash (id, chg, pkt->response);
700
701	pkt->hmac_set (octx);
702
703	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);
704
705	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
706		842
707	delete pkt;	843	delete pkt;
708	}	844	}
709		845
710	void	846	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	848	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
715		852
716	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);
717		854
718	r->hmac_set (octx);	855	r->hmac_set (octx);
719	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
720		857
721	delete r;	858	delete r;
722	}	859	}
723		860
724	void	861	inline void
725	connection::establish_connection_cb (time_watcher &w)	862	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	863	{
727	if (ictx || conf == THISNODE	864	if (!(ictx && octx)
		865	&& conf != THISNODE
728	|| connectmode == conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
729	|| connectmode == conf_node::C_DISABLED)	867	&& connectmode != conf_node::C_DISABLED
730	w.at = TSTAMP_CANCEL;	868	&& !w.is_active ())
731	else if (w.at <= NOW)
732	{	869	{
733	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
734		871	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
736	retry_cnt++;	875	return;
		876	}
737		877
738	w.at = 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));
739		883
740	reset_si ();	884	reset_si ();
741		885
742	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);
743	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
		893	}
744	else	894	else
745	{	895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
746	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
		901
		902	slow = slow || (dsi.prot & PROT_SLOW);
747		903
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	904	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	905	{
750	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))
751	send_auth_request (dsi, true);	910	send_auth_request (dsi, true);
752	else	911	else
753	send_ping (dsi, 0);	912	send_ping (dsi, 0);
754	}	913	}
755	}	914	}
756	}
757	}
758		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
759	void	927	void
760	connection::reset_connection ()	928	connection::reset_connection (const char *reason)
761	{	929	{
762	if (ictx && octx)	930	if (ictx && octx)
763	{	931	{
764	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost (%s)"),
765	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si, reason);
766		934
767	if (::conf.script_node_down)	935	if (::conf.script_node_down)
768	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	}
769	}	941	}
770		942
771	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
772	delete octx; octx = 0;	944	delete octx; octx = 0;
773		945
774	si.host= 0;	946	si.host = 0;
775		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
776	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
777	retry_cnt = 0;	954	retry_cnt = 0;
778		955
779	rekey.reset ();	956	rekey.stop ();
780	keepalive.reset ();	957	keepalive.stop ();
781	establish_connection.reset ();	958	establish_connection.stop ();
782	}	959	}
783		960
784	void	961	void
785	connection::shutdown ()	962	connection::shutdown ()
786	{	963	{
787	if (ictx && octx)	964	if (ictx && octx)
788	send_reset (si);	965	send_reset (si);
789		966
790	reset_connection ();	967	reset_connection ("shutdown");
791	}	968	}
792		969
793	void	970	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
795	{	973	{
796	w.at = TSTAMP_CANCEL;
797
798	reset_connection ();	974	reset_connection ("rekeying");
799	establish_connection ();	975	establish_connection ();
800	}	976	}
801		977
802	void	978	void
803	connection::send_data_packet (tap_packet *pkt, bool broadcast)	979	connection::send_data_packet (tap_packet *pkt)
804	{	980	{
805	vpndata_packet *p = new vpndata_packet;	981	vpndata_packet *p = new vpndata_packet;
806	int tos = 0;	982	int tos = 0;
807		983
808	// I am not hilarious about peeking into packets, but so be it.	984	// I am not hilarious about peeking into packets, but so be it.
809	if (conf->inherit_tos	985	if (conf->inherit_tos && pkt->is_ipv4 ())
810	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
811	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
812	tos = (*pkt)[15] & IPTOS_TOS_MASK;	986	tos = (*pkt)[15] & IPTOS_TOS_MASK;
813		987
814	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
815	send_vpn_packet (p, si, tos);	989	send_vpn_packet (p, si, tos);
816		990
817	delete p;	991	delete p;
818		992
819	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
820	rekey ();	994	rekey ();
821	}	995	}
822		996
823	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
824	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1008	connection::inject_data_packet (tap_packet *pkt)
825	{	1009	{
826	if (ictx && octx)	1010	if (ictx && octx)
827	send_data_packet (pkt, broadcast);	1011	send_data_packet (pkt);
828	else	1012	else
829	{	1013	{
830	if (!broadcast)//DDDD
831	data_queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
832		1015	post_inject_queue ();
833	establish_connection ();
834	}	1016	}
835	}	1017	}
836		1018
		1019	void
837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
838	{	1021	{
839	if (ictx && octx)	1022	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	1023	send_vpn_packet (pkt, si, tos);
841	else	1024	else
842	{	1025	{
843	vpn_queue.put (new vpn_packet (*pkt));	1026	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
844		1027	post_inject_queue ();
845	establish_connection ();
846	}	1028	}
847	}	1029	}
848		1030
849	void	1031	void
850	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
851	{	1033	{
852	last_activity = NOW;	1034	last_activity = ev_now ();
853		1035
854	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.",
855	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;
856		1041
857	switch (pkt->typ ())	1042	switch (pkt->typ ())
858	{	1043	{
859	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
860	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
861	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
862	// when we receive a ping.	1049	// when we receive a ping.
863	if (!ictx)	1050	if (!ictx)
864	{	1051	{
865	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
866	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
867	}	1054	}
868	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.
869	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
870		1059
871	break;	1060	break;
872		1061
873	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 ();
874	break;	1068	break;
875		1069
876	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)
877	{	1074	{
878	reset_connection ();	1075	reset_connection ("remote reset");
879		1076
880	config_packet *p = (config_packet *) pkt;	1077	config_packet *p = (config_packet *) pkt;
881		1078
882	if (!p->chk_config ())	1079	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
883	{
884	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
885	conf->nodename, (const char *)rsi);
886	connectmode = conf_node::C_DISABLED;
887	}
888	else if (connectmode == conf_node::C_ALWAYS)
889	establish_connection ();	1080	establish_connection ();
890	}	1081	}
		1082
891	break;	1083	break;
892		1084
893	case vpn_packet::PT_AUTH_REQ:	1085	case vpn_packet::PT_AUTH_REQ:
894	if (auth_rate_limiter.can (rsi))	1086	if (auth_rate_limiter.can (rsi))
895	{	1087	{
896	auth_req_packet *p = (auth_req_packet *) pkt;	1088	auth_req_packet *p = (auth_req_packet *)pkt;
897		1089
898	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);
899		1093
900	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))
901	{	1100	{
902	if (p->prot_minor != PROTOCOL_MINOR)	1101	if (p->prot_minor != PROTOCOL_MINOR)
903	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."),
904	conf->nodename, (const char *)rsi,	1103	conf->nodename, (const char *)rsi,
905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1104	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
906		1105
907	if (p->initiate)	1106	if (p->initiate)
		1107	{
908	send_auth_request (rsi, false);	1108	send_auth_request (rsi, false);
909		1109
910	rsachallenge k;	1110	if (ictx && octx)
		1111	reset_connection ("reconnect");
		1112	}
911		1113
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	1114	auth_data auth;
913	(unsigned char *)&p->encr, (unsigned char *)&k,	1115
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1116	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1117	{
915	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?"),
916	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));
		1120	}
917	else	1121	else
918	{	1122	{
919	delete octx;	1123	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
920		1124
921	octx = new crypto_ctx (k, 1);	1125	rcv_auth = auth;
922	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1126	have_rcv_auth = true;
923		1127
		1128	send_auth_response (rsi);
		1129
		1130	if (chg)
		1131	{
924	conf->protocols = p->protocols;	1132	conf->protocols = p->protocols;
		1133	features = p->features & config_packet::get_features ();
925		1134
926	send_auth_response (rsi, p->id, k);
927
928	connection_established ();	1135	connection_established (rsi);
929
930	break;	1136	}
931	}	1137	}
		1138
		1139	break;
932	}	1140	}
933	else
934	slog (L_WARN, _("%s(%s): protocol mismatch"),
935	conf->nodename, (const char *)rsi);
936		1141
937	send_reset (rsi);	1142	send_reset (rsi);
938	}	1143	}
939		1144
940	break;	1145	break;
941		1146
942	case vpn_packet::PT_AUTH_RES:	1147	case vpn_packet::PT_AUTH_RES:
943	{	1148	{
944	auth_res_packet *p = (auth_res_packet *) pkt;	1149	auth_res_packet *p = (auth_res_packet *)pkt;
945		1150
946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1151	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
947		1152
948	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))
949	{	1157	{
950	if (p->prot_minor != PROTOCOL_MINOR)
951	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
952	conf->nodename, (const char *)rsi,
953	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
954
955	rsachallenge chg;
956
957	if (!rsa_cache.find (p->id, chg))
958	{
959	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1158	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
960	conf->nodename, (const char *)rsi);	1159	conf->nodename, (const char *)rsi);
961	break;
962	}	1160	}
963	else	1161	else if (!have_snd_auth)
964	{	1162	{
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1163	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
966		1164
967	if (!p->hmac_chk (cctx))	1165	have_snd_auth = true;
968	{
969	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
970	"could be an attack, or just corruption or an synchronization error"),
971	conf->nodename, (const char *)rsi);
972	break;
973	}
974	else
975	{
976	rsaresponse h;
977
978	rsa_hash (p->id, chg, h);
979
980	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
981	{
982	prot_minor = p->prot_minor;
983
984	delete ictx; ictx = cctx;
985
986	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
987
988	si = rsi;
989	protocol = rsi.prot;
990
991	connection_established ();	1166	connection_established (rsi);
992
993	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
994	conf->nodename, (const char *)rsi,
995	p->prot_major, p->prot_minor);
996
997	if (::conf.script_node_up)
998	run_script (run_script_cb (this, &connection::script_node_up), false);
999
1000	break;
1001	}
1002	else
1003	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1004	conf->nodename, (const char *)rsi);
1005	}
1006
1007	delete cctx;
1008	}
1009	}	1167	}
1010	}	1168	}
1011
1012	send_reset (rsi);
1013	break;	1169	break;
1014		1170
1015	case vpn_packet::PT_DATA_COMPRESSED:	1171	case vpn_packet::PT_DATA_COMPRESSED:
1016	#if !ENABLE_COMPRESSION	1172	#if !ENABLE_COMPRESSION
1017	send_reset (rsi);	1173	send_reset (rsi);
…		…
1023	if (ictx && octx)	1179	if (ictx && octx)
1024	{	1180	{
1025	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
1026		1182
1027	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	{
1028	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"
1029	"could be an attack, or just corruption or an synchronization error"),	1199	"could be an attack, or just corruption or a synchronization error."),
1030	conf->nodename, (const char *)rsi);	1200	conf->nodename, (const char *)rsi);
		1201	// reset
		1202	}
		1203	}
1031	else	1204	else
1032	{	1205	{
1033	u32 seqno;	1206	u32 seqno;
1034	tap_packet *d = p->unpack (this, seqno);	1207	tap_packet *d = p->unpack (this, seqno);
		1208	int seqclass = iseqno.seqno_classify (seqno);
1035		1209
1036	if (iseqno.recv_ok (seqno))	1210	hmac_error = 0;
		1211
		1212	if (seqclass == 0) // ok
1037	{	1213	{
1038	vpn->tap->send (d);	1214	vpn->tap->send (d);
1039		1215
1040	if (p->dst () == 0) // re-broadcast
1041	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1042	{
1043	connection *c = *i;
1044
1045	if (c->conf != THISNODE && c->conf != conf)
1046	c->inject_data_packet (d);
1047	}
1048
1049	if (si != rsi)	1216	if (si != rsi)
1050	{	1217	{
1051	// 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.)
1052	si = rsi;	1220	// {
1053
1054	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1221	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1055	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);
1056	}	1237	}
1057
1058	delete d;
1059
1060	break;
1061	}	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;
1062	}	1254	}
1063	}	1255	}
1064		1256
1065	send_reset (rsi);	1257	send_reset (rsi);
1066	break;	1258	break;
1067		1259
1068	case vpn_packet::PT_CONNECT_REQ:	1260	case vpn_packet::PT_CONNECT_REQ:
1069	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1261	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1070	{	1262	{
1071	connect_req_packet *p = (connect_req_packet *) pkt;	1263	connect_req_packet *p = (connect_req_packet *)pkt;
1072		1264
1073	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 ())
1074	connection *c = vpn->conns[p->id - 1];
1075	conf->protocols = p->protocols;
1076
1077	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1078	conf->id, p->id, c->ictx && c->octx);
1079
1080	if (c->ictx && c->octx)
1081	{	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	{
1082	// send connect_info packets to both sides, in case one is	1277	// send connect_info packets to both sides, in case one is
1083	// behind a nat firewall (or both ;)	1278	// behind a nat firewall (or both ;)
1084	c->send_connect_info (conf->id, si, conf->protocols);	1279	c->send_connect_info (conf->id, si, conf->protocols);
1085	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 ();
1086	}	1284	}
1087	else	1285	else
1088	c->establish_connection ();	1286	slog (L_WARN,
		1287	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1288	p->id);
1089	}	1289	}
1090		1290
1091	break;	1291	break;
1092		1292
1093	case vpn_packet::PT_CONNECT_INFO:	1293	case vpn_packet::PT_CONNECT_INFO:
1094	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1294	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1095	{	1295	{
1096	connect_info_packet *p = (connect_info_packet *) pkt;	1296	connect_info_packet *p = (connect_info_packet *)pkt;
1097		1297
1098	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 ())
1099		1299	{
1100	connection *c = vpn->conns[p->id - 1];	1300	connection *c = vpn->conns[p->id - 1];
1101		1301
1102	c->conf->protocols = p->protocols;	1302	c->conf->protocols = p->protocols;
1103	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));
1104	p->si.upgrade_protocol (protocol, c->conf);	1304	p->si.upgrade_protocol (protocol, c->conf);
1105		1305
1106	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]",
1107	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);
1108		1314
1109	const sockinfo &dsi = forward_si (p->si);	1315	const sockinfo &dsi = forward_si (p->si);
1110		1316
1111	if (dsi.valid ())	1317	if (dsi.valid ())
1112	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);
1113	}	1328	}
1114		1329
1115	break;	1330	break;
1116		1331
1117	default:	1332	default:
1118	send_reset (rsi);	1333	send_reset (rsi);
1119	break;	1334	break;
1120	}	1335	}
1121	}	1336	}
1122		1337
1123	void connection::keepalive_cb (time_watcher &w)	1338	inline void
		1339	connection::keepalive_cb (ev::timer &w, int revents)
1124	{	1340	{
1125	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)
1126	{	1346	{
1127	reset_connection ();	1347	reset_connection ("keepalive overdue");
1128	establish_connection ();	1348	establish_connection ();
1129	}	1349	}
1130	else if (NOW < last_activity + ::conf.keepalive)
1131	w.at = last_activity + ::conf.keepalive;
1132	else if (conf->connectmode != conf_node::C_ONDEMAND	1350	else if (conf->connectmode != conf_node::C_ONDEMAND
1133	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1351	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1134	{	1352	{
		1353	w.start (3);
1135	send_ping (si);	1354	send_ping (si);
1136	w.at = NOW + 5;
1137	}	1355	}
1138	else if (NOW < last_activity + ::conf.keepalive + 10)	1356	else if (when >= -10)
1139	// hold ondemand connections implicitly a few seconds longer	1357	// hold ondemand connections implicitly a few seconds longer
1140	// should delete octx, though, or something like that ;)	1358	// should delete octx, though, or something like that ;)
1141	w.at = last_activity + ::conf.keepalive + 10;	1359	w.start (when + 10);
1142	else	1360	else
1143	reset_connection ();	1361	reset_connection ("keepalive timeout");
1144	}	1362	}
1145		1363
		1364	void
1146	void connection::send_connect_request (int id)	1365	connection::send_connect_request (int id)
1147	{	1366	{
1148	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);
1149		1368
1150	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);
1151	p->hmac_set (octx);	1372	p->hmac_set (octx);
1152	send_vpn_packet (p, si);	1373	send_vpn_packet (p, si);
1153		1374
1154	delete p;	1375	delete p;
1155	}	1376	}
1156		1377
1157	void connection::script_node ()	1378	void
		1379	connection::script_init_env (const char *ext)
1158	{	1380	{
1159	vpn->script_if_up ();
1160
1161	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;
1162	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);
1163	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1397	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1164	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1398	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1165	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1399	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1166	}	1400	}
1167		1401
		1402	inline const char *
1168	const char *connection::script_node_up ()	1403	connection::script_node_up ()
1169	{	1404	{
1170	script_node ();	1405	script_init_connect_env ();
1171		1406
1172	putenv ("STATE=up");	1407	putenv ((char *)"STATE=up");
1173		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
1174	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1413	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1175	}
1176		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 *
1177	const char *connection::script_node_down ()	1435	connection::script_node_down ()
1178	{	1436	{
1179	script_node ();	1437	script_init_connect_env ();
1180		1438
1181	putenv ("STATE=down");	1439	putenv ((char *)"STATE=down");
1182		1440
1183	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1441	char *filename;
1184	}	1442	asprintf (&filename,
		1443	"%s/%s",
		1444	confbase,
		1445	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1185		1446
		1447	return filename;
		1448	}
		1449
1186	connection::connection(struct vpn *vpn_)	1450	connection::connection (struct vpn *vpn, conf_node *conf)
1187	: vpn(vpn_)	1451	: vpn(vpn), conf(conf),
1188	, rekey (this, &connection::rekey_cb)	1452	#if ENABLE_DNS
1189	, 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);
1190	, establish_connection (this, &connection::establish_connection_cb)	1460	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1191	{	1461
		1462	last_establish_attempt = 0.;
1192	octx = ictx = 0;	1463	octx = ictx = 0;
1193	retry_cnt = 0;
1194		1464
1195	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
1196	reset_connection ();	1471	reset_connection ("startup");
1197	}	1472	}
1198		1473
1199	connection::~connection ()	1474	connection::~connection ()
1200	{	1475	{
1201	shutdown ();	1476	shutdown ();
1202	}	1477	}
1203		1478
		1479	void
1204	void connection_init ()	1480	connection_init ()
1205	{	1481	{
1206	auth_rate_limiter.clear ();	1482	auth_rate_limiter.clear ();
1207	reset_rate_limiter.clear ();	1483	reset_rate_limiter.clear ();
1208	}	1484	}
1209		1485

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