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Comparing gvpe/src/connection.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.116 by root, Mon Apr 1 03:10:26 2019 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013,2016 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"
33
34	#include "conf.h"	44	#include "conf.h"
35	#include "slog.h"	45	#include "slog.h"
		46	#include "crypto.h"
36	#include "device.h"	47	#include "device.h"
37	#include "vpn.h"	48	#include "vpn.h"
38	#include "connection.h"	49	#include "connection.h"
		50	#include "hkdf.h"
39		51
40	#if !HAVE_RAND_PSEUDO_BYTES	52	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		53
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	54	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		55
		56	#define LZF_STATE_ARG 1
		57	#define ULTRA_FAST 1
		58	#define HLOG 15
		59	#define INIT_HTAB 0
		60	#include "lzf/lzf_c.c"
		61	#include "lzf/lzf_d.c"
		62
		63	//////////////////////////////////////////////////////////////////////////////
		64
		65	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		66	static ev::child rs_child_ev;
		67
		68	namespace
		69	{
		70	void // c++ requires external linkage here, apparently :(
		71	rs_child_cb (ev::child &w, int revents)
		72	{
		73	w.stop ();
		74
		75	if (rs_queue.empty ())
		76	return;
		77
		78	pid_t pid = run_script (*rs_queue.front ().first, false);
		79	if (pid)
		80	{
		81	w.set (pid);
		82	w.start ();
		83	}
		84	else
		85	slog (L_WARN, rs_queue.front ().second);
		86
		87	delete rs_queue.front ().first;
		88	rs_queue.pop ();
		89	}
		90	};
		91
		92	// despite the fancy name, this is quite a hack
		93	static void
		94	run_script_queued (run_script_cb *cb, const char *warnmsg)
		95	{
		96	rs_queue.push (std::make_pair (cb, warnmsg));
		97
		98	if (!rs_child_ev.is_active ())
		99	{
		100	rs_child_ev.set<rs_child_cb> ();
		101	rs_child_ev ();
		102	}
		103	}
		104
		105	//////////////////////////////////////////////////////////////////////////////
45		106
46	struct crypto_ctx	107	struct crypto_ctx
47	{	108	{
48	EVP_CIPHER_CTX cctx;	109	cipher cctx;
49	HMAC_CTX hctx;	110	hmac hctx;
50		111
51	crypto_ctx (const rsachallenge &challenge, int enc);	112	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	113	~crypto_ctx ();
53	};	114	};
54		115
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	116	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	117	{
		118	ecdh_key s;
		119
		120	curve25519_combine (a, b, s);
		121
		122	{
		123	u8 mac_key[MAC_KEYSIZE];
		124	static const unsigned char mac_info[] = "gvpe mac key";
		125
		126	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		127	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		128	kdf.extract (s, sizeof (s));
		129	kdf.extract_done (HKDF_PRF_HASH ());
		130	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		131
		132	hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ());
		133	}
		134
		135	{
		136	u8 cipher_key[CIPHER_KEYSIZE];
		137	static const unsigned char cipher_info[] = "gvpe cipher key";
		138
		139	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
57	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	147	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	148	}
62		149
63	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
64	{	151	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (cctx));
66	HMAC_CTX_cleanup (&hctx);	153	}
		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
67	}	180	}
68		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	189	}
81		190
82	struct rsa_entry {	191	void
83	tstamp expire;	192	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	193	{
90	void cleaner_cb (tstamp &ts); time_watcher cleaner;	194	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		199
132	} rsa_cache;	200	// eventual response data
133		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (tstamp &ts)
135	{
136	if (empty ())
137	ts = TSTAMP_CANCEL;
138	else
139	{	202	}
140	ts = NOW + RSA_TTL;
141		203
142	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
143	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	206	}
149		207
150	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
151		209
152	void pkt_queue::put (tap_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
153	{	212	{
154	if (queue[i])	213	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		214
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	215	i = 0;
182	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	219	}
184		220
185	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
186	{	222	{
187	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
188	delete queue[i];	226	delete [] queue;
189	}	227	}
190		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
191	struct net_rateinfo {	285	struct net_rateinfo
		286	{
192	u32 host;	287	u32 host;
193	double pcnt, diff;	288	double pcnt, diff;
194	tstamp last;	289	tstamp last;
195	};	290	};
196		291
197	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	294	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
201	{	296	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		301
206	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	303	bool can (u32 host);
208	};	304	};
209		305
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		307
		308	bool
212	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
213	{	310	{
214	iterator i;	311	iterator i;
215		312
216	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
217	if (i->host == host)	314	if (i->host == host)
218	break;	315	break;
219	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	317	i = erase (i);
221	else	318	else
222	i++;	319	i++;
223		320
224	if (i == end ())	321	if (i == end ())
225	{	322	{
226	net_rateinfo ri;	323	net_rateinfo ri;
227		324
228	ri.host = host;	325	ri.host = host;
229	ri.pcnt = 1.;	326	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	327	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	328	ri.last = ev_now ();
232		329
233	push_front (ri);	330	push_front (ri);
234		331
235	return true;	332	return true;
236	}	333	}
237	else	334	else
238	{	335	{
239	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
240	erase (i);	337	erase (i);
241		338
242	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		341
245	ri.last = NOW;	342	ri.last = ev_now ();
246		343
		344	double dif = ri.diff / ri.pcnt;
		345
247	bool send = ri.diff / ri.pcnt > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
248		347
		348	if (dif > NRL_MAXDIF)
		349	{
		350	ri.pcnt = 1.;
		351	ri.diff = NRL_MAXDIF;
		352	}
249	if (send)	353	else if (send)
250	ri.pcnt++;	354	ri.pcnt++;
251		355
252	push_front (ri);	356	push_front (ri);
253		357
254	return send;	358	return send;
255	}	359	}
256	}	360	}
257		361
258	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
259		363
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
261
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
263	{	366	{
264	unsigned int xlen;	367	ctx->hctx.init ();
265		368	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
266	HMAC_CTX *hctx = &ctx->hctx;	369	ctx->hctx.digest (hmac_digest);
267
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
270	len - sizeof (hmac_packet));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
272	}	370	}
273		371
274	void	372	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	373	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	374	{
277	hmac_gen (ctx);	375	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
278		376	hmac_gen (ctx, hmac_digest);
279	memcpy (hmac, hmac_digest, HMACLENGTH);	377	memcpy (hmac, hmac_digest, HMACLENGTH);
280	}	378	}
281		379
282	bool	380	bool
283	hmac_packet::hmac_chk (crypto_ctx *ctx)	381	hmac_packet::hmac_chk (crypto_ctx *ctx)
284	{	382	{
285	hmac_gen (ctx);	383	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		384	hmac_gen (ctx, hmac_digest);
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	385	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
288	}	386	}
289		387
		388	void
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	389	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	390	{
292	this->type = type;	391	type = type_;
293		392
294	int src = THISNODE->id;	393	int src = THISNODE->id;
295		394
296	src1 = src;	395	src1 = src;
297	srcdst = ((src >> 8) << 4) | (dst >> 8);	396	srcdst = ((src >> 8) << 4) | (dst >> 8);
298	dst1 = dst;	397	dst1 = dst;
299	}	398	}
300		399
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	400	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		401
304	struct vpndata_packet:vpn_packet	402	struct vpndata_packet : vpn_packet
		403	{
		404	u32 ctr; // seqno
		405	u8 data[MAXVPNDATA];
		406
		407	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		408	tap_packet *unpack (connection *conn, u32 &seqno);
		409
		410	private:
		411	const u32 data_hdr_size () const
305	{	412	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno	413	// the distance from beginning of packet to data member
307		414	return data - at (0);
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;
315	}
316	};	415	}
		416	};
		417
		418	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		419	static unsigned char *
		420	expand_iv (u32 ctr)
		421	{
		422	static u32 iv[IV_SIZE (CIPHER) / 4];
		423
		424	require (sizeof (iv) == 4 * 4);
		425	require (IV_SIZE (CIPHER) % 4 == 0);
		426
		427	iv[0] =
		428	iv[1] =
		429	iv[2] = ctr;
		430
		431	// I would reuse ctr here to to avoid potential endianness issues,
		432	// but it seems openssl wraps around. While this would be still ok,
		433	// and I don't even know if its true, let's play safe and initialise
		434	// to 0.
		435	iv[3] = 0;
		436
		437	return (unsigned char *)iv;
		438	}
317		439
318	void	440	void
319	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	441	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
320	{	442	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	443	EVP_CIPHER_CTX *cctx = conn->octx->cctx;
322	int outl = 0, outl2;	444	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	445	ptype type = PT_DATA_UNCOMPRESSED;
324		446
325	#if ENABLE_COMPRESSION	447	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	448	u8 cdata[MAX_MTU];
327	u32 cl;
328		449
		450	if (conn->features & FEATURE_COMPRESSION)
		451	{
		452	static LZF_STATE lzf_state;
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	453	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7, lzf_state);
		454
330	if (cl)	455	if (cl)
331	{	456	{
332	type = PT_DATA_COMPRESSED;	457	type = PT_DATA_COMPRESSED;
333	d = cdata;	458	d = cdata;
334	l = cl + 2;	459	l = cl + 2;
335		460
336	d[0] = cl >> 8;	461	d[0] = cl >> 8;
337	d[1] = cl;	462	d[1] = cl;
		463	}
338	}	464	}
339	#endif	465	#endif
340		466
		467	ctr = htonl (seqno);
		468
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	469	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
342		470
343	struct {
344	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];
346	#endif
347	u32 seqno;
348	} datahdr;
349
350	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
353	#endif
354
355	EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	472	(unsigned char *)data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	473	(unsigned char *)d, l));
358	outl += outl2;	474	outl += outl2;
359		475
360	EVP_EncryptUpdate (cctx,	476	// it seems this is a nop for us, but we do it anyways
361	(unsigned char *) data + outl, &outl2,	477	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
362	(unsigned char *) d, l);
363	outl += outl2;	478	outl += outl2;
364		479
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);
366	outl += outl2;
367
368	len = outl + data_hdr_size ();	480	len = data_hdr_size () + outl;
369		481
370	set_hdr (type, dst);	482	set_hdr (type, dst);
371		483
372	hmac_set (conn->octx);	484	hmac_set (conn->octx);
373	}	485	}
374		486
375	tap_packet *	487	tap_packet *
376	vpndata_packet::unpack (connection *conn, u32 &seqno)	488	vpndata_packet::unpack (connection *conn, u32 &seqno)
377	{	489	{
378	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	490	EVP_CIPHER_CTX *cctx = conn->ictx->cctx;
379	int outl = 0, outl2;	491	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	492	tap_packet *p = new tap_packet;
381	u8 *d;	493	u8 *d;
382	u32 l = len - data_hdr_size ();
383		494
		495	seqno = ntohl (ctr);
		496
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	497	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
385		498
386	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
388		501
389	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	503	d = cdata;
391	else	504	else
392	#endif	505	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6];
394		507
395	/* this overwrites part of the src mac, but we fix that later */	508	// this can overwrite the len/dst/src fields
396	EVP_DecryptUpdate (cctx,	509	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	510	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	511	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	512	outl += outl2;
400		513
		514	// it seems this is a nop for us, but we do it anyways
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	516	outl += outl2;
403		517
404	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
405
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
407	id2mac (src (), p->src);	519	id2mac (src (), p->src);
408		520
409	#if ENABLE_COMPRESSION	521	#if ENABLE_COMPRESSION
410	if (type == PT_DATA_COMPRESSED)	522	if (type == PT_DATA_COMPRESSED)
411	{	523	{
412	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	524	u32 cl = (d[0] << 8) | d[1];
413		525
414	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	526	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
415	&(*p)[6 + 6], MAX_MTU)	527	&(*p)[6 + 6], MAX_MTU)
416	+ 6 + 6;	528	+ 6 + 6;
417	}	529	}
418	else	530	else
419	p->len = outl + (6 + 6 - DATAHDR);	531	p->len = outl + (6 + 6);
420	#endif	532	#endif
421		533
422	return p;	534	return p;
423	}	535	}
424		536
…		…
431	}	543	}
432	};	544	};
433		545
434	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
435	{	547	{
436	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
442		552
443	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
444	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f |= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f |= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
445	return 0x80	568	return f;
446	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}	569	}
448
449	void setup (ptype type, int dst);
450	bool chk_config () const;
451	};	570	};
452		571
		572	void
453	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
454	{	574	{
455	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	577	flags = 0;
458	hmaclen = HMACLENGTH;	578	features = get_features ();
459	flags = curflags ();
460	challengelen = sizeof (rsachallenge);
461		579
		580	strncpy ((char *)serial, conf.serial, sizeof (serial));
		581
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	583	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		584	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		585
466	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	587	set_hdr (type, dst);
468	}	588	}
469		589
470	bool config_packet::chk_config () const	590	bool
		591	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
471	{	592	{
472	return prot_major == PROTOCOL_MAJOR	593	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	594	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
474	&& hmaclen == HMACLENGTH	595	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
475	&& flags == curflags ()
476	&& challengelen == sizeof (rsachallenge)
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	596	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	597	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	598	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
480	}	599	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		600	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		601	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		602	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		603	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		604	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		605	else
		606	{
		607	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
481		608
		609	if (cmp > 0)
		610	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		611	conf->nodename, (const char *)rsi);
		612	else if (cmp == 0)
		613	return true;
		614	}
		615
		616	return false;
		617	}
		618
482	struct auth_req_packet : config_packet	619	struct auth_req_packet : config_packet // UNPROTECTED
483	{	620	{
484	char magic[8];	621	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	622	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	623	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	624	u8 pad2, pad3;
488	rsaid id;	625	auth_encr encr;
489	rsaencrdata encr;
490		626
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	627	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	628	{
493	config_packet::setup (PT_AUTH_REQ, dst);	629	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	630	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	631	initiate = !!initiate_;
496	protocols = protocols_;	632	protocols = protocols_;
497		633
498	len = sizeof (*this) - sizeof (net_packet);	634	len = sizeof (*this) - sizeof (net_packet);
499	}	635	}
500	};	636	};
501		637
502	struct auth_res_packet : config_packet	638	struct auth_res_packet : vpn_packet // UNPROTECTED
503	{	639	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	640	auth_response response;
508		641
509	auth_res_packet (int dst)	642	auth_res_packet (int dst)
510	{	643	{
511	config_packet::setup (PT_AUTH_RES, dst);	644	set_hdr (PT_AUTH_RES, dst);
512		645
513	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
514	}	647	}
515	};	648	};
516		649
…		…
546	};	679	};
547		680
548	/////////////////////////////////////////////////////////////////////////////	681	/////////////////////////////////////////////////////////////////////////////
549		682
550	void	683	void
		684	connection::connection_established (const sockinfo &rsi)
		685	{
		686	if (!have_snd_auth || !have_rcv_auth)
		687	return;
		688
		689	si = rsi;
		690	protocol = rsi.prot;
		691
		692	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		693	conf->nodename, (const char *)rsi,
		694	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		695	PROTOCOL_MAJOR, prot_minor);
		696
		697	if (::conf.script_node_up)
		698	{
		699	run_script_cb *cb = new run_script_cb;
		700	cb->set<connection, &connection::script_node_up> (this);
		701	run_script_queued (cb, _("node-up command execution failed, continuing."));
		702	}
		703
		704	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		705	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		706
		707	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		708	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		709
		710	// make sure rekeying timeouts are slightly asymmetric
		711	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		712	rekey.start (rekey_interval, rekey_interval);
		713
		714	hmac_error = 0.;
		715
		716	keepalive.start (::conf.keepalive);
		717
		718	// send queued packets
		719	while (tap_packet *p = (tap_packet *)data_queue.get ())
		720	{
		721	if (p->len) send_data_packet (p);
		722	delete p;
		723	}
		724
		725	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		726	{
		727	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		728	delete p;
		729	}
		730
		731	vpn->connection_established (this);
		732	}
		733
		734	void
551	connection::reset_dstaddr ()	735	connection::reset_si ()
552	{	736	{
		737	if (vpn->can_direct (THISNODE, conf))
		738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
		739	else
		740	{
		741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
		742	protocol = 0;
		743	}
		744
553	si.set (conf);	745	si.set (conf, protocol);
		746	}
		747
		748	// ensure sockinfo is valid, forward if necessary
		749	const sockinfo &
		750	connection::forward_si (const sockinfo &si) const
		751	{
		752	if (!si.valid ())
		753	{
		754	connection *r = vpn->find_router_for (this);
		755
		756	if (r)
		757	{
		758	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
		759	conf->nodename, r->conf->nodename);
		760	return r->si;
		761	}
		762	else
		763	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		764	conf->nodename);
		765	}
		766
		767	return si;
		768	}
		769
		770	void
		771	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		772	{
		773	if (!vpn->send_vpn_packet (pkt, si, tos))
		774	reset_connection ("packet send error");
554	}	775	}
555		776
556	void	777	void
557	connection::send_ping (const sockinfo &si, u8 pong)	778	connection::send_ping (const sockinfo &si, u8 pong)
558	{	779	{
559	ping_packet *pkt = new ping_packet;	780	ping_packet *pkt = new ping_packet;
560		781
561	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	782	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		783
		784	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
562	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	785	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563		786
564	delete pkt;	787	delete pkt;
565	}	788	}
566		789
…		…
581	void	804	void
582	connection::send_auth_request (const sockinfo &si, bool initiate)	805	connection::send_auth_request (const sockinfo &si, bool initiate)
583	{	806	{
584	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	807	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
585		808
586	protocol = best_protocol (THISNODE->protocols & conf->protocols);	809	generate_auth_data ();
		810	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
587		811
588	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591
592	if (protocol)
593	{
594	rsachallenge chg;
595
596	rsa_cache.gen (pkt->id, chg);
597
598	if (0 > RSA_public_encrypt (sizeof chg,
599	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
601	fatal ("RSA_public_encrypt error");
602
603	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	812	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
604
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	813	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
606		814
607	delete pkt;	815	delete pkt;
608	}
609	else
610	; // silently fail
611	}	816	}
612		817
613	void	818	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	819	connection::send_auth_response (const sockinfo &si)
615	{	820	{
616	auth_res_packet *pkt = new auth_res_packet (conf->id);	821	auth_res_packet *pkt = new auth_res_packet (conf->id);
617		822
618	pkt->id = id;	823	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		824	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
619		825
620	rsa_hash (id, chg, pkt->response);
621
622	pkt->hmac_set (octx);
623
624	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
625
626	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
627		828
628	delete pkt;	829	delete pkt;
629	}	830	}
630		831
631	void	832	void
632	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	833	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
633	{	834	{
634	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	835	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
635	conf->id, rid, (const char *)rsi);	836	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		837	conf->protocols);
636		838
637	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	839	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
638		840
639	r->hmac_set (octx);	841	r->hmac_set (octx);
640	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
641		843
642	delete r;	844	delete r;
643	}	845	}
644		846
645	void	847	inline void
646	connection::establish_connection_cb (tstamp &ts)	848	connection::establish_connection_cb (ev::timer &w, int revents)
647	{	849	{
648	if (ictx || conf == THISNODE	850	if (!(ictx && octx)
		851	&& conf != THISNODE
649	|| connectmode == conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
650	|| connectmode == conf_node::C_DISABLED)	853	&& connectmode != conf_node::C_DISABLED
651	ts = TSTAMP_CANCEL;	854	&& !w.is_active ())
652	else if (ts <= NOW)
653	{	855	{
654	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
655		857	// and stop trying. should probably be handled by a per-connection expire handler.
656	if (retry_int < 3600 * 8)	858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
657	retry_cnt++;
658
659	ts = NOW + retry_int;
660
661	if (conf->hostname)
662	{	859	{
663	reset_dstaddr ();	860	reset_connection ("no demand");
664	if (si.host && auth_rate_limiter.can (si))	861	return;
665	{
666	if (retry_cnt < 4)
667	send_auth_request (si, true);
668	else
669	send_ping (si, 0);
670	}	862	}
		863
		864	last_establish_attempt = ev_now ();
		865
		866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		867	? (retry_cnt & 3) + 1
		868	: 1 << (retry_cnt >> 2));
		869
		870	reset_si ();
		871
		872	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
		873
		874	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		875	{
		876	/*TODO*/ /* start the timer so we don't recurse endlessly */
		877	w.start (1);
		878	vpn->send_connect_request (this);
671	}	879	}
672	else	880	else
673	vpn->connect_request (conf->id);	881	{
674	}	882	if (si.valid ())
675	}	883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
676		885
		886	const sockinfo &dsi = forward_si (si);
		887
		888	slow = slow || (dsi.prot & PROT_SLOW);
		889
		890	if (dsi.valid () && auth_rate_limiter.can (dsi))
		891	{
		892	// use ping after the first few retries
		893	// TODO: on rekeys, the other node might not interpret ping correctly,
		894	// TODO: as it will still have a valid connection
		895	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
		896	send_auth_request (dsi, true);
		897	else
		898	send_ping (dsi, 0);
		899	}
		900	}
		901
		902	retry_int *= slow ? 4. : 0.9;
		903
		904	if (retry_int < conf->max_retry)
		905	retry_cnt++;
		906	else
		907	retry_int = conf->max_retry;
		908
		909	w.start (retry_int);
		910	}
		911	}
		912
677	void	913	void
678	connection::reset_connection ()	914	connection::reset_connection (const char *reason)
679	{	915	{
680	if (ictx && octx)	916	if (ictx && octx)
681	{	917	{
682	slog (L_INFO, _("%s(%s): connection lost"),	918	slog (L_INFO, _("%s(%s): connection lost (%s)"),
683	conf->nodename, (const char *)si);	919	conf->nodename, (const char *)si, reason);
684		920
685	if (::conf.script_node_down)	921	if (::conf.script_node_down)
686	run_script (run_script_cb (this, &connection::script_node_down), false);	922	{
		923	run_script_cb *cb = new run_script_cb;
		924	cb->set<connection, &connection::script_node_down> (this);
		925	run_script_queued (cb, _("node-down command execution failed, continuing."));
		926	}
687	}	927	}
688		928
689	delete ictx; ictx = 0;	929	delete ictx; ictx = 0;
690	delete octx; octx = 0;	930	delete octx; octx = 0;
691		931
692	si.host= 0;	932	si.host = 0;
693		933
		934	have_snd_auth = false;
		935	have_rcv_auth = false;
		936	auth_expire = 0.;
		937
694	last_activity = 0;	938	last_activity = 0.;
		939	//last_si_change = 0.;
695	retry_cnt = 0;	940	retry_cnt = 0;
696		941
697	rekey.reset ();	942	rekey.stop ();
698	keepalive.reset ();	943	keepalive.stop ();
699	establish_connection.reset ();	944	establish_connection.stop ();
700	}	945	}
701		946
702	void	947	void
703	connection::shutdown ()	948	connection::shutdown ()
704	{	949	{
705	if (ictx && octx)	950	if (ictx && octx)
706	send_reset (si);	951	send_reset (si);
707		952
708	reset_connection ();	953	reset_connection ("shutdown");
709	}	954	}
710		955
711	void	956	// poor-man's rekeying
712	connection::rekey_cb (tstamp &ts)	957	inline void
		958	connection::rekey_cb (ev::timer &w, int revents)
713	{	959	{
714	ts = TSTAMP_CANCEL;
715
716	reset_connection ();	960	reset_connection ("rekeying");
717	establish_connection ();	961	establish_connection ();
718	}	962	}
719		963
720	void	964	void
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	965	connection::send_data_packet (tap_packet *pkt)
722	{	966	{
723	vpndata_packet *p = new vpndata_packet;	967	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	968	int tos = 0;
725		969
726	if (conf->inherit_tos	970	// I am not hilarious about peeking into packets, but so be it.
727	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	971	if (conf->inherit_tos && pkt->is_ipv4 ())
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	972	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		973
731	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	974	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
732	send_vpn_packet (p, si, tos);	975	send_vpn_packet (p, si, tos);
733		976
734	delete p;	977	delete p;
735		978
736	if (oseqno > MAX_SEQNO)	979	if (oseqno > MAX_SEQNO)
737	rekey ();	980	rekey ();
738	}	981	}
739		982
740	void	983	void
		984	connection::post_inject_queue ()
		985	{
		986	// force a connection every now and when when packets are sent (max 1/s)
		987	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		988	establish_connection.stop ();
		989
		990	establish_connection ();
		991	}
		992
		993	void
741	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	994	connection::inject_data_packet (tap_packet *pkt)
742	{	995	{
743	if (ictx && octx)	996	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	997	send_data_packet (pkt);
745	else	998	else
746	{	999	{
747	if (!broadcast)//DDDD
748	queue.put (new tap_packet (*pkt));	1000	data_queue.put (new tap_packet (*pkt));
		1001	post_inject_queue ();
		1002	}
		1003	}
749		1004
750	establish_connection ();	1005	void
		1006	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1007	{
		1008	if (ictx && octx)
		1009	send_vpn_packet (pkt, si, tos);
		1010	else
		1011	{
		1012	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1013	post_inject_queue ();
751	}	1014	}
752	}	1015	}
753		1016
754	void	1017	void
755	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1018	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
756	{	1019	{
757	last_activity = NOW;	1020	last_activity = ev_now ();
758		1021
759	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1022	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
760	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1023	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1024
		1025	if (connectmode == conf_node::C_DISABLED)
		1026	return;
761		1027
762	switch (pkt->typ ())	1028	switch (pkt->typ ())
763	{	1029	{
764	case vpn_packet::PT_PING:	1030	case vpn_packet::PT_PING:
		1031	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1032
765	// we send pings instead of auth packets after some retries,	1033	// we send pings instead of auth packets after some retries,
766	// so reset the retry counter and establish a connection	1034	// so reset the retry counter and establish a connection
767	// when we receive a ping.	1035	// when we receive a ping.
768	if (!ictx)	1036	if (!ictx)
		1037	{
		1038	if (auth_rate_limiter.can (rsi))
		1039	send_auth_request (rsi, true);
		1040	}
		1041	else
		1042	// we would love to change the socket address here, but ping's aren't
		1043	// authenticated, so we best ignore it.
		1044	send_ping (rsi, 1); // pong
		1045
		1046	break;
		1047
		1048	case vpn_packet::PT_PONG:
		1049	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1050
		1051	// a PONG might mean that the other side doesn't really know
		1052	// about our desire for communication.
		1053	establish_connection ();
		1054	break;
		1055
		1056	case vpn_packet::PT_RESET:
		1057	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1058
		1059	if (ictx && octx)
		1060	{
		1061	reset_connection ("remote reset");
		1062
		1063	config_packet *p = (config_packet *) pkt;
		1064
		1065	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
		1066	establish_connection ();
		1067	}
		1068
		1069	break;
		1070
		1071	case vpn_packet::PT_AUTH_REQ:
		1072	if (auth_rate_limiter.can (rsi))
		1073	{
		1074	auth_req_packet *p = (auth_req_packet *)pkt;
		1075
		1076	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1077	conf->nodename, p->initiate ? "initiate" : "reply",
		1078	p->protocols, p->features);
		1079
		1080	if (memcmp (p->magic, MAGIC, 8))
		1081	{
		1082	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1083	conf->nodename, (const char *)rsi);
		1084	}
		1085	else if (p->chk_config (conf, rsi))
		1086	{
		1087	if (p->prot_minor != PROTOCOL_MINOR)
		1088	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		1089	conf->nodename, (const char *)rsi,
		1090	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		1091
		1092	if (p->initiate)
		1093	{
		1094	send_auth_request (rsi, false);
		1095
		1096	if (ictx && octx)
		1097	reset_connection ("reconnect");
		1098	}
		1099
		1100	auth_data auth;
		1101
		1102	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1103	{
		1104	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		1105	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1106	}
		1107	else
		1108	{
		1109	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
		1110
		1111	rcv_auth = auth;
		1112	have_rcv_auth = true;
		1113
		1114	send_auth_response (rsi);
		1115
		1116	if (chg)
		1117	{
		1118	conf->protocols = p->protocols;
		1119	features = p->features & config_packet::get_features ();
		1120
		1121	connection_established (rsi);
		1122	}
		1123	}
		1124
		1125	break;
		1126	}
		1127
		1128	send_reset (rsi);
		1129	}
		1130
		1131	break;
		1132
		1133	case vpn_packet::PT_AUTH_RES:
769	{	1134	{
770	if (auth_rate_limiter.can (rsi))	1135	auth_res_packet *p = (auth_res_packet *)pkt;
771	send_auth_request (rsi, true);	1136
		1137	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
		1138
		1139	auth_mac local_mac;
		1140	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1141
		1142	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
		1143	{
		1144	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
		1145	conf->nodename, (const char *)rsi);
		1146	}
		1147	else if (!have_snd_auth)
		1148	{
		1149	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1150
		1151	have_snd_auth = true;
		1152	connection_established (rsi);
		1153	}
772	}	1154	}
773	else
774	send_ping (rsi, 1); // pong
775
776	break;	1155	break;
777		1156
778	case vpn_packet::PT_PONG:	1157	case vpn_packet::PT_DATA_COMPRESSED:
		1158	#if !ENABLE_COMPRESSION
		1159	send_reset (rsi);
779	break;	1160	break;
		1161	#endif
780		1162
781	case vpn_packet::PT_RESET:	1163	case vpn_packet::PT_DATA_UNCOMPRESSED:
782	{
783	reset_connection ();
784		1164
785	config_packet *p = (config_packet *) pkt;	1165	if (ictx && octx)
786
787	if (!p->chk_config ())
788	{	1166	{
789	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
790	conf->nodename, (const char *)rsi);
791	connectmode = conf_node::C_DISABLED;
792	}
793	else if (connectmode == conf_node::C_ALWAYS)
794	establish_connection ();
795	}
796	break;
797
798	case vpn_packet::PT_AUTH_REQ:
799	if (auth_rate_limiter.can (rsi))
800	{
801	auth_req_packet *p = (auth_req_packet *) pkt;	1167	vpndata_packet *p = (vpndata_packet *)pkt;
802		1168
803	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1169	if (!p->hmac_chk (ictx))
804
805	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
806	{	1170	{
807	if (p->prot_minor != PROTOCOL_MINOR)	1171	// rekeying often creates temporary hmac auth floods
808	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1172	// we assume they don't take longer than a few seconds normally,
809	conf->nodename, (const char *)rsi,	1173	// and suppress messages and resets during that time.
810	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1174	//TODO: should be done per source address
811		1175	if (!hmac_error)
812	if (p->initiate)	1176	{
813	send_auth_request (rsi, false);	1177	hmac_error = ev_now () + 3;
814		1178	break;
815	rsachallenge k;	1179	}
816		1180	else if (hmac_error >= ev_now ())
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	1181	break; // silently suppress
818	(unsigned char *)&p->encr, (unsigned char *)&k,	1182	else
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1183	{
820	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1185	"could be an attack, or just corruption or a synchronization error."),
821	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
822	else
823	{
824	retry_cnt = 0;
825	establish_connection.set (NOW + 8); //? ;)
826	keepalive.reset ();
827	rekey.reset ();
828
829	delete ictx;
830	ictx = 0;
831
832	delete octx;
833
834	octx = new crypto_ctx (k, 1);
835	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
836
837	conf->protocols = p->protocols;
838	send_auth_response (rsi, p->id, k);
839
840	break;	1187	// reset
841	}	1188	}
842	}	1189	}
843
844	send_reset (rsi);
845	}
846
847	break;
848
849	case vpn_packet::PT_AUTH_RES:
850	{
851	auth_res_packet *p = (auth_res_packet *) pkt;
852
853	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
854
855	if (p->chk_config ())
856	{
857	if (p->prot_minor != PROTOCOL_MINOR)
858	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
859	conf->nodename, (const char *)rsi,
860	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861
862	rsachallenge chg;
863
864	if (!rsa_cache.find (p->id, chg))
865	slog (L_ERR, _("%s(%s): unrequested auth response"),
866	conf->nodename, (const char *)rsi);
867	else	1190	else
868	{	1191	{
869	crypto_ctx *cctx = new crypto_ctx (chg, 0);
870
871	if (!p->hmac_chk (cctx))
872	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
873	"could be an attack, or just corruption or an synchronization error"),
874	conf->nodename, (const char *)rsi);
875	else	1192	u32 seqno;
		1193	tap_packet *d = p->unpack (this, seqno);
		1194	int seqclass = iseqno.seqno_classify (seqno);
		1195
		1196	hmac_error = 0;
		1197
		1198	if (seqclass == 0) // ok
876	{	1199	{
877	rsaresponse h;	1200	vpn->tap->send (d);
878		1201
879	rsa_hash (p->id, chg, h);	1202	if (si != rsi)
880
881	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
882	{	1203	{
883	prot_minor = p->prot_minor;	1204	// fast re-sync on source address changes, useful especially for tcp/ip
884		1205	//if (last_si_change < ev_now () + 5.)
885	delete ictx; ictx = cctx;
886
887	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888
889	si = rsi;
890
891	rekey.set (NOW + ::conf.rekey);
892	keepalive.set (NOW + ::conf.keepalive);
893
894	// send queued packets
895	while (tap_packet *p = queue.get ())
896	{	1206	// {
897	send_data_packet (p);	1207	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1208	conf->nodename, (const char *)si, (const char *)rsi);
		1209
		1210	si = rsi;
		1211
		1212	if (::conf.script_node_change)
898	delete p;	1213	{
		1214	run_script_cb *cb = new run_script_cb;
		1215	cb->set<connection, &connection::script_node_change> (this);
		1216	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1217	}
		1218
899	}	1219	// }
900		1220	//else
901	connectmode = conf->connectmode;	1221	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
902
903	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
904	conf->nodename, (const char *)rsi,	1222	// conf->nodename, (const char *)si, (const char *)rsi);
905	strprotocol (protocol),
906	p->prot_major, p->prot_minor);
907
908	if (::conf.script_node_up)
909	run_script (run_script_cb (this, &connection::script_node_up), false);
910
911	break;
912	}	1223	}
913	else
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
915	conf->nodename, (const char *)rsi);
916	}	1224	}
		1225	else if (seqclass == 1) // far history
		1226	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1227	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1228	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1229	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1230	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1231	else if (seqclass == 3) // reset
		1232	{
		1233	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1234	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1235	send_reset (rsi);
		1236	}
917		1237
918	delete cctx;	1238	delete d;
		1239	break;
919	}	1240	}
920	}	1241	}
921	}
922		1242
923	send_reset (rsi);	1243	send_reset (rsi);
924	break;	1244	break;
925		1245
926	case vpn_packet::PT_DATA_COMPRESSED:
927	#if !ENABLE_COMPRESSION
928	send_reset (rsi);
929	break;
930	#endif
931
932	case vpn_packet::PT_DATA_UNCOMPRESSED:
933
934	if (ictx && octx)
935	{
936	vpndata_packet *p = (vpndata_packet *)pkt;
937
938	if (rsi == si)
939	{
940	if (!p->hmac_chk (ictx))
941	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
942	"could be an attack, or just corruption or an synchronization error"),
943	conf->nodename, (const char *)rsi);
944	else
945	{
946	u32 seqno;
947	tap_packet *d = p->unpack (this, seqno);
948
949	if (iseqno.recv_ok (seqno))
950	{
951	vpn->tap->send (d);
952
953	if (p->dst () == 0) // re-broadcast
954	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
955	{
956	connection *c = *i;
957
958	if (c->conf != THISNODE && c->conf != conf)
959	c->inject_data_packet (d);
960	}
961
962	delete d;
963
964	break;
965	}
966	}
967	}
968	else
969	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
970	}
971
972	send_reset (rsi);
973	break;
974
975	case vpn_packet::PT_CONNECT_REQ:	1246	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1247	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1248	{
978	connect_req_packet *p = (connect_req_packet *) pkt;	1249	connect_req_packet *p = (connect_req_packet *)pkt;
979		1250
980	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1251	if (p->id > 0 && p->id <= vpn->conns.size ())
981	conf->protocols = p->protocols;	1252	{
982	connection *c = vpn->conns[p->id - 1];	1253	connection *c = vpn->conns[p->id - 1];
		1254	conf->protocols = p->protocols;
983		1255
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1256	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1257	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1258	p->protocols,
985	conf->id, p->id, c->ictx && c->octx);	1259	c->ictx && c->octx);
986		1260
987	if (c->ictx && c->octx)	1261	if (c->ictx && c->octx)
988	{	1262	{
989	// send connect_info packets to both sides, in case one is	1263	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1264	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1265	c->send_connect_info (conf->id, si, conf->protocols);
992	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1266	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1267	}
		1268	else
		1269	c->establish_connection ();
993	}	1270	}
		1271	else
		1272	slog (L_WARN,
		1273	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1274	p->id);
994	}	1275	}
995		1276
996	break;	1277	break;
997		1278
998	case vpn_packet::PT_CONNECT_INFO:	1279	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1280	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1281	{
1001	connect_info_packet *p = (connect_info_packet *) pkt;	1282	connect_info_packet *p = (connect_info_packet *)pkt;
1002		1283
1003	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1284	if (p->id > 0 && p->id <= vpn->conns.size ())
1004	conf->protocols = p->protocols;	1285	{
1005	connection *c = vpn->conns[p->id - 1];	1286	connection *c = vpn->conns[p->id - 1];
1006		1287
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1288	c->conf->protocols = p->protocols;
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1289	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1290	p->si.upgrade_protocol (protocol, c->conf);
1009		1291
		1292	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
		1293	conf->nodename,
		1294	vpn->conns[p->id - 1]->conf->nodename,
		1295	(const char *)p->si,
		1296	p->protocols,
		1297	protocol,
		1298	p->si.supported_protocols (c->conf),
		1299	!c->ictx && !c->octx);
		1300
		1301	const sockinfo &dsi = forward_si (p->si);
		1302
		1303	if (dsi.valid ())
1010	c->send_auth_request (p->si, true);	1304	c->send_auth_request (dsi, true);
		1305	else
		1306	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si);
		1309	}
		1310	else
		1311	slog (L_WARN,
		1312	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1313	p->id);
1011	}	1314	}
1012		1315
1013	break;	1316	break;
1014		1317
1015	default:	1318	default:
1016	send_reset (rsi);	1319	send_reset (rsi);
1017	break;	1320	break;
1018
1019	}
1020	}
1021
1022	void connection::keepalive_cb (tstamp &ts)
1023	{
1024	if (NOW >= last_activity + ::conf.keepalive + 30)
1025	{	1321	}
1026	reset_connection ();	1322	}
		1323
		1324	inline void
		1325	connection::keepalive_cb (ev::timer &w, int revents)
		1326	{
		1327	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1328
		1329	if (when >= 0)
		1330	w.start (when);
		1331	else if (when < -15)
		1332	{
		1333	reset_connection ("keepalive overdue");
1027	establish_connection ();	1334	establish_connection ();
1028	}	1335	}
1029	else if (NOW < last_activity + ::conf.keepalive)
1030	ts = last_activity + ::conf.keepalive;
1031	else if (conf->connectmode != conf_node::C_ONDEMAND	1336	else if (conf->connectmode != conf_node::C_ONDEMAND
1032	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1337	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1033	{	1338	{
		1339	w.start (3);
1034	send_ping (si);	1340	send_ping (si);
1035	ts = NOW + 5;
1036	}	1341	}
		1342	else if (when >= -10)
		1343	// hold ondemand connections implicitly a few seconds longer
		1344	// should delete octx, though, or something like that ;)
		1345	w.start (when + 10);
1037	else	1346	else
1038	reset_connection ();	1347	reset_connection ("keepalive timeout");
1039	}	1348	}
1040		1349
		1350	void
1041	void connection::connect_request (int id)	1351	connection::send_connect_request (int id)
1042	{	1352	{
1043	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1353	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1044		1354
1045	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1355	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1356	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1357	THISNODE->protocols);
1046	p->hmac_set (octx);	1358	p->hmac_set (octx);
1047	send_vpn_packet (p, si);	1359	send_vpn_packet (p, si);
1048		1360
1049	delete p;	1361	delete p;
1050	}	1362	}
1051		1363
1052	void connection::script_node ()	1364	void
		1365	connection::script_init_env (const char *ext)
1053	{	1366	{
1054	vpn->script_if_up (0);
1055
1056	char *env;	1367	char *env;
		1368	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1369	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1370	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1371	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1372	conf->id & 0xff); putenv (env);
		1373	}
		1374
		1375	void
		1376	connection::script_init_connect_env ()
		1377	{
		1378	vpn->script_init_env ();
		1379
		1380	char *env;
1057	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1381	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1382	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1058	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1383	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1059	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1384	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1060	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1385	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1061	}	1386	}
1062		1387
		1388	inline const char *
1063	const char *connection::script_node_up (int)	1389	connection::script_node_up ()
1064	{	1390	{
1065	script_node ();	1391	script_init_connect_env ();
1066		1392
1067	putenv ("STATE=up");	1393	putenv ((char *)"STATE=up");
1068		1394
		1395	char *filename;
		1396	asprintf (&filename,
		1397	"%s/%s",
		1398	confbase,
1069	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1399	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1070	}
1071		1400
		1401	return filename;
		1402	}
		1403
		1404	inline const char *
		1405	connection::script_node_change ()
		1406	{
		1407	script_init_connect_env ();
		1408
		1409	putenv ((char *)"STATE=change");
		1410
		1411	char *filename;
		1412	asprintf (&filename,
		1413	"%s/%s",
		1414	confbase,
		1415	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1416
		1417	return filename;
		1418	}
		1419
		1420	inline const char *
1072	const char *connection::script_node_down (int)	1421	connection::script_node_down ()
1073	{	1422	{
1074	script_node ();	1423	script_init_connect_env ();
1075		1424
1076	putenv ("STATE=down");	1425	putenv ((char *)"STATE=down");
1077		1426
1078	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1427	char *filename;
1079	}	1428	asprintf (&filename,
		1429	"%s/%s",
		1430	confbase,
		1431	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1080		1432
1081	// send a vpn packet out to other hosts	1433	return filename;
1082	void
1083	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1084	{
1085	if (protocol & PROT_IPv4)
1086	vpn->send_ipv4_packet (pkt, si, tos);
1087	else
1088	vpn->send_udpv4_packet (pkt, si, tos);
1089	}	1434	}
1090		1435
1091	connection::connection(struct vpn *vpn_)	1436	connection::connection (struct vpn *vpn, conf_node *conf)
1092	: vpn(vpn_)	1437	: vpn(vpn), conf(conf),
1093	, rekey (this, &connection::rekey_cb)	1438	#if ENABLE_DNS
1094	, keepalive (this, &connection::keepalive_cb)	1439	dns (0),
		1440	#endif
		1441	data_queue(conf->max_ttl, conf->max_queue + 1),
		1442	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1443	{
		1444	rekey .set<connection, &connection::rekey_cb > (this);
		1445	keepalive .set<connection, &connection::keepalive_cb > (this);
1095	, establish_connection (this, &connection::establish_connection_cb)	1446	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1096	{	1447
		1448	last_establish_attempt = 0.;
1097	octx = ictx = 0;	1449	octx = ictx = 0;
1098	retry_cnt = 0;
1099		1450
1100	connectmode = conf_node::C_ALWAYS; // initial setting	1451	connectmode = conf->connectmode;
		1452
		1453	// queue a dummy packet to force an initial connection attempt
		1454	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1455	vpn_queue.put (new net_packet);
		1456
1101	reset_connection ();	1457	reset_connection ("startup");
1102	}	1458	}
1103		1459
1104	connection::~connection ()	1460	connection::~connection ()
1105	{	1461	{
1106	shutdown ();	1462	shutdown ();
1107	}	1463	}
1108		1464
		1465	void
1109	void connection_init ()	1466	connection_init ()
1110	{	1467	{
1111	auth_rate_limiter.clear ();	1468	auth_rate_limiter.clear ();
1112	reset_rate_limiter.clear ();	1469	reset_rate_limiter.clear ();
1113	}	1470	}
1114		1471

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