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Comparing gvpe/src/connection.C (file contents):
Revision 1.9 by pcg, Sun Apr 6 04:31:51 2003 UTC vs.
Revision 1.114 by root, Thu Jun 30 11:43:38 2016 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 ULTRA_FAST 1
		57	#define HLOG 15
		58	#include "lzf/lzf.h"
		59	#include "lzf/lzf_c.c"
		60	#include "lzf/lzf_d.c"
		61
		62	//////////////////////////////////////////////////////////////////////////////
		63
		64	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		65	static ev::child rs_child_ev;
		66
		67	namespace
		68	{
		69	void // c++ requires external linkage here, apparently :(
		70	rs_child_cb (ev::child &w, int revents)
		71	{
		72	w.stop ();
		73
		74	if (rs_queue.empty ())
		75	return;
		76
		77	pid_t pid = run_script (*rs_queue.front ().first, false);
		78	if (pid)
		79	{
		80	w.set (pid);
		81	w.start ();
		82	}
		83	else
		84	slog (L_WARN, rs_queue.front ().second);
		85
		86	delete rs_queue.front ().first;
		87	rs_queue.pop ();
		88	}
		89	};
		90
		91	// despite the fancy name, this is quite a hack
		92	static void
		93	run_script_queued (run_script_cb *cb, const char *warnmsg)
		94	{
		95	rs_queue.push (std::make_pair (cb, warnmsg));
		96
		97	if (!rs_child_ev.is_active ())
		98	{
		99	rs_child_ev.set<rs_child_cb> ();
		100	rs_child_ev ();
		101	}
		102	}
		103
		104	//////////////////////////////////////////////////////////////////////////////
45		105
46	struct crypto_ctx	106	struct crypto_ctx
47	{	107	{
48	EVP_CIPHER_CTX cctx;	108	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	109	hmac hctx;
50		110
51	crypto_ctx (const rsachallenge &challenge, int enc);	111	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	112	~crypto_ctx ();
53	};	113	};
54		114
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	115	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	116	{
		117	ecdh_key s;
		118
		119	curve25519_combine (a, b, s);
		120
		121	{
		122	u8 mac_key[MAC_KEYSIZE];
		123	static const unsigned char mac_info[] = "gvpe mac key";
		124
		125	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		126	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		127	kdf.extract (s, sizeof (s));
		128	kdf.extract_done (HKDF_PRF_HASH ());
		129	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		130
		131	hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ());
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
57	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	146	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	147	}
62		148
63	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
64	{	150	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	152	}
		153
		154	static inline void
		155	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		156	{
		157	if (RSA_public_encrypt (sizeof (auth.rsa),
		158	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		159	key, RSA_PKCS1_OAEP_PADDING) < 0)
		160	fatal ("RSA_public_encrypt error");
		161
		162	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		163	}
		164
		165	static inline bool
		166	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		167	{
		168	u8 rsa_decrypt[RSA_KEYLEN];
		169
		170	if (RSA_private_decrypt (sizeof (encr.rsa),
		171	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		172	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		173	return 0;
		174
		175	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		176	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		177
		178	return 1;
67	}	179	}
68		180
69	static void	181	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	182	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	183	{
72	EVP_MD_CTX ctx;	184	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		185	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	186	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	187	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	}	188	}
81		189
82	struct rsa_entry {	190	void
83	tstamp expire;	191	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	192	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	193	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	{ }	194	{
		195	// request data
		196	rand_fill (snd_auth.rsa);
		197	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		198
132	} rsa_cache;	199	// eventual response data
133		200	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	{	201	}
140	w.at = NOW + RSA_TTL;
141		202
142	for (iterator i = begin (); i != end (); )	203	// every use prolongs the expiry
143	if (i->expire <= NOW)	204	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	205	}
149		206
150	//////////////////////////////////////////////////////////////////////////////	207	//////////////////////////////////////////////////////////////////////////////
151		208
152	void pkt_queue::put (tap_packet *p)	209	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		210	: max_ttl (max_ttl), max_queue (max_queue)
153	{	211	{
154	if (queue[i])	212	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		213
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;	214	i = 0;
182	j = 0;	215	j = 0;
		216
		217	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	218	}
184		219
185	pkt_queue::~pkt_queue ()	220	pkt_queue::~pkt_queue ()
186	{	221	{
187	for (i = QUEUEDEPTH; --i > 0; )	222	while (net_packet *p = get ())
		223	delete p;
		224
188	delete queue[i];	225	delete [] queue;
189	}	226	}
190		227
		228	void
		229	pkt_queue::expire_cb (ev::timer &w, int revents)
		230	{
		231	ev_tstamp expire = ev_now () - max_ttl;
		232
		233	for (;;)
		234	{
		235	if (empty ())
		236	break;
		237
		238	double diff = queue[j].tstamp - expire;
		239
		240	if (diff >= 0.)
		241	{
		242	w.start (diff > 0.5 ? diff : 0.5);
		243	break;
		244	}
		245
		246	delete get ();
		247	}
		248	}
		249
		250	void
		251	pkt_queue::put (net_packet *p)
		252	{
		253	ev_tstamp now = ev_now ();
		254
		255	// start expiry timer
		256	if (empty ())
		257	expire.start (max_ttl);
		258
		259	int ni = i + 1 == max_queue ? 0 : i + 1;
		260
		261	if (ni == j)
		262	delete get ();
		263
		264	queue[i].pkt = p;
		265	queue[i].tstamp = now;
		266
		267	i = ni;
		268	}
		269
		270	net_packet *
		271	pkt_queue::get ()
		272	{
		273	if (empty ())
		274	return 0;
		275
		276	net_packet *p = queue[j].pkt;
		277	queue[j].pkt = 0;
		278
		279	j = j + 1 == max_queue ? 0 : j + 1;
		280
		281	return p;
		282	}
		283
191	struct net_rateinfo {	284	struct net_rateinfo
		285	{
192	u32 host;	286	u32 host;
193	double pcnt, diff;	287	double pcnt, diff;
194	tstamp last;	288	tstamp last;
195	};	289	};
196		290
197	// only do action once every x seconds per host whole allowing bursts.	291	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	292	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	293	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	294	struct net_rate_limiter : list<net_rateinfo>
201	{	295	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	296	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	297	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	298	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		299	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		300
206	bool can (const sockinfo &si) { return can((u32)si.host); }	301	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	302	bool can (u32 host);
208	};	303	};
209		304
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	305	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		306
		307	bool
212	bool net_rate_limiter::can (u32 host)	308	net_rate_limiter::can (u32 host)
213	{	309	{
214	iterator i;	310	iterator i;
215		311
216	for (i = begin (); i != end (); )	312	for (i = begin (); i != end (); )
217	if (i->host == host)	313	if (i->host == host)
218	break;	314	break;
219	else if (i->last < NOW - EXPIRE)	315	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	316	i = erase (i);
221	else	317	else
222	i++;	318	i++;
223		319
224	if (i == end ())	320	if (i == end ())
225	{	321	{
226	net_rateinfo ri;	322	net_rateinfo ri;
227		323
228	ri.host = host;	324	ri.host = host;
229	ri.pcnt = 1.;	325	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	326	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	327	ri.last = ev_now ();
232		328
233	push_front (ri);	329	push_front (ri);
234		330
235	return true;	331	return true;
236	}	332	}
237	else	333	else
238	{	334	{
239	net_rateinfo ri (*i);	335	net_rateinfo ri (*i);
240	erase (i);	336	erase (i);
241		337
242	ri.pcnt = ri.pcnt * ALPHA;	338	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	339	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		340
245	ri.last = NOW;	341	ri.last = ev_now ();
246		342
		343	double dif = ri.diff / ri.pcnt;
		344
247	bool send = ri.diff / ri.pcnt > CUTOFF;	345	bool send = dif > NRL_CUTOFF;
248		346
		347	if (dif > NRL_MAXDIF)
		348	{
		349	ri.pcnt = 1.;
		350	ri.diff = NRL_MAXDIF;
		351	}
249	if (send)	352	else if (send)
250	ri.pcnt++;	353	ri.pcnt++;
251		354
252	push_front (ri);	355	push_front (ri);
253		356
254	return send;	357	return send;
255	}	358	}
256	}	359	}
257		360
258	/////////////////////////////////////////////////////////////////////////////	361	/////////////////////////////////////////////////////////////////////////////
259		362
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	363	void
261
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	364	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
263	{	365	{
264	unsigned int xlen;	366	ctx->hctx.init ();
265		367	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
266	HMAC_CTX *hctx = &ctx->hctx;	368	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	}	369	}
273		370
274	void	371	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	372	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	373	{
277	hmac_gen (ctx);	374	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
278		375	hmac_gen (ctx, hmac_digest);
279	memcpy (hmac, hmac_digest, HMACLENGTH);	376	memcpy (hmac, hmac_digest, HMACLENGTH);
280	}	377	}
281		378
282	bool	379	bool
283	hmac_packet::hmac_chk (crypto_ctx *ctx)	380	hmac_packet::hmac_chk (crypto_ctx *ctx)
284	{	381	{
285	hmac_gen (ctx);	382	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		383	hmac_gen (ctx, hmac_digest);
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	384	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
288	}	385	}
289		386
		387	void
290	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	388	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	389	{
292	type = type_;	390	type = type_;
293		391
294	int src = THISNODE->id;	392	int src = THISNODE->id;
295		393
…		…
297	srcdst = ((src >> 8) << 4) | (dst >> 8);	395	srcdst = ((src >> 8) << 4) | (dst >> 8);
298	dst1 = dst;	396	dst1 = dst;
299	}	397	}
300		398
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	399	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		400
304	struct vpndata_packet:vpn_packet	401	struct vpndata_packet : vpn_packet
		402	{
		403	u32 ctr; // seqno
		404	u8 data[MAXVPNDATA];
		405
		406	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		407	tap_packet *unpack (connection *conn, u32 &seqno);
		408
		409	private:
		410	const u32 data_hdr_size () const
305	{	411	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno	412	// the distance from beginning of packet to data member
307		413	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	};	414	}
		415	};
		416
		417	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		418	static unsigned char *
		419	expand_iv (u32 ctr)
		420	{
		421	static u32 iv[IV_SIZE (CIPHER) / 4];
		422
		423	require (sizeof (iv) == 4 * 4);
		424	require (IV_SIZE (CIPHER) % 4 == 0);
		425
		426	iv[0] =
		427	iv[1] =
		428	iv[2] = ctr;
		429
		430	// I would reuse ctr here to to avoid potential endianness issues,
		431	// but it seems openssl wraps around. While this would be still ok,
		432	// and I don't even know if its true, let's play safe and initialise
		433	// to 0.
		434	iv[3] = 0;
		435
		436	return (unsigned char *)iv;
		437	}
317		438
318	void	439	void
319	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	440	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
320	{	441	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	442	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	443	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	444	ptype type = PT_DATA_UNCOMPRESSED;
324		445
325	#if ENABLE_COMPRESSION	446	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	447	u8 cdata[MAX_MTU];
327	u32 cl;
328		448
		449	if (conn->features & FEATURE_COMPRESSION)
		450	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	451	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		452
330	if (cl)	453	if (cl)
331	{	454	{
332	type = PT_DATA_COMPRESSED;	455	type = PT_DATA_COMPRESSED;
333	d = cdata;	456	d = cdata;
334	l = cl + 2;	457	l = cl + 2;
335		458
336	d[0] = cl >> 8;	459	d[0] = cl >> 8;
337	d[1] = cl;	460	d[1] = cl;
		461	}
338	}	462	}
339	#endif	463	#endif
340		464
		465	ctr = htonl (seqno);
		466
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	467	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
342		468
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,	469	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	470	(unsigned char *)data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *)d, l));
358	outl += outl2;	472	outl += outl2;
359		473
360	EVP_EncryptUpdate (cctx,	474	// it seems this is a nop for us, but we do it anyways
361	(unsigned char *) data + outl, &outl2,	475	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
362	(unsigned char *) d, l);
363	outl += outl2;	476	outl += outl2;
364		477
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);
366	outl += outl2;
367
368	len = outl + data_hdr_size ();	478	len = data_hdr_size () + outl;
369		479
370	set_hdr (type, dst);	480	set_hdr (type, dst);
371		481
372	hmac_set (conn->octx);	482	hmac_set (conn->octx);
373	}	483	}
…		…
377	{	487	{
378	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	488	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
379	int outl = 0, outl2;	489	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	490	tap_packet *p = new tap_packet;
381	u8 *d;	491	u8 *d;
382	u32 l = len - data_hdr_size ();
383		492
		493	seqno = ntohl (ctr);
		494
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	495	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
385		496
386	#if ENABLE_COMPRESSION	497	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	498	u8 cdata[MAX_MTU];
388		499
389	if (type == PT_DATA_COMPRESSED)	500	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	501	d = cdata;
391	else	502	else
392	#endif	503	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	504	d = &(*p)[6 + 6];
394		505
395	/* this overwrites part of the src mac, but we fix that later */	506	// this can overwrite the len/dst/src fields
396	EVP_DecryptUpdate (cctx,	507	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	508	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	509	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	510	outl += outl2;
400		511
		512	// it seems this is a nop for us, but we do it anyways
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	514	outl += outl2;
403		515
404	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
405
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	516	id2mac (dst () ? dst() : THISNODE->id, p->dst);
407	id2mac (src (), p->src);	517	id2mac (src (), p->src);
408		518
409	#if ENABLE_COMPRESSION	519	#if ENABLE_COMPRESSION
410	if (type == PT_DATA_COMPRESSED)	520	if (type == PT_DATA_COMPRESSED)
411	{	521	{
412	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	522	u32 cl = (d[0] << 8) | d[1];
413		523
414	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	524	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
415	&(*p)[6 + 6], MAX_MTU)	525	&(*p)[6 + 6], MAX_MTU)
416	+ 6 + 6;	526	+ 6 + 6;
417	}	527	}
418	else	528	else
419	p->len = outl + (6 + 6 - DATAHDR);	529	p->len = outl + (6 + 6);
420	#endif	530	#endif
421		531
422	return p;	532	return p;
423	}	533	}
424		534
…		…
431	}	541	}
432	};	542	};
433		543
434	struct config_packet : vpn_packet	544	struct config_packet : vpn_packet
435	{	545	{
436	// actually, hmaclen cannot be checked because the hmac	546	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;	547	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	548	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	549	u32 cipher_nid, mac_nid, auth_nid;
442		550
443	const u8 curflags () const	551	void setup (ptype type, int dst);
		552	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		553
		554	static u8 get_features ()
444	{	555	{
		556	u8 f = 0;
		557	#if ENABLE_COMPRESSION
		558	f |= FEATURE_COMPRESSION;
		559	#endif
		560	#if ENABLE_ROHC
		561	f |= FEATURE_ROHC;
		562	#endif
		563	#if ENABLE_BRIDGING
		564	f |= FEATURE_BRIDGING;
		565	#endif
445	return 0x80	566	return f;
446	| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}	567	}
448
449	void setup (ptype type, int dst);
450	bool chk_config () const;
451	};	568	};
452		569
		570	void
453	void config_packet::setup (ptype type, int dst)	571	config_packet::setup (ptype type, int dst)
454	{	572	{
455	prot_major = PROTOCOL_MAJOR;	573	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	574	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	575	flags = 0;
458	hmaclen = HMACLENGTH;	576	features = get_features ();
459	flags = curflags ();
460	challengelen = sizeof (rsachallenge);
461		577
		578	strncpy ((char *)serial, conf.serial, sizeof (serial));
		579
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	580	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	581	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		582	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		583
466	len = sizeof (*this) - sizeof (net_packet);	584	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	585	set_hdr (type, dst);
468	}	586	}
469		587
470	bool config_packet::chk_config () const	588	bool
		589	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
471	{	590	{
472	return prot_major == PROTOCOL_MAJOR	591	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	592	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
474	&& hmaclen == HMACLENGTH	593	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
475	&& flags == curflags ()
476	&& challengelen == sizeof (rsachallenge)
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	595	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	596	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
480	}	597	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		598	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		599	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		600	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		601	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		602	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		603	else
		604	{
		605	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
481		606
		607	if (cmp > 0)
		608	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		609	conf->nodename, (const char *)rsi);
		610	else if (cmp == 0)
		611	return true;
		612	}
		613
		614	return false;
		615	}
		616
482	struct auth_req_packet : config_packet	617	struct auth_req_packet : config_packet // UNPROTECTED
483	{	618	{
484	char magic[8];	619	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	620	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	621	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	622	u8 pad2, pad3;
488	rsaid id;	623	auth_encr encr;
489	rsaencrdata encr;
490		624
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	625	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	626	{
493	config_packet::setup (PT_AUTH_REQ, dst);	627	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	628	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	629	initiate = !!initiate_;
496	protocols = protocols_;	630	protocols = protocols_;
497		631
498	len = sizeof (*this) - sizeof (net_packet);	632	len = sizeof (*this) - sizeof (net_packet);
499	}	633	}
500	};	634	};
501		635
502	struct auth_res_packet : config_packet	636	struct auth_res_packet : vpn_packet // UNPROTECTED
503	{	637	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	638	auth_response response;
508		639
509	auth_res_packet (int dst)	640	auth_res_packet (int dst)
510	{	641	{
511	config_packet::setup (PT_AUTH_RES, dst);	642	set_hdr (PT_AUTH_RES, dst);
512		643
513	len = sizeof (*this) - sizeof (net_packet);	644	len = sizeof (*this) - sizeof (net_packet);
514	}	645	}
515	};	646	};
516		647
…		…
546	};	677	};
547		678
548	/////////////////////////////////////////////////////////////////////////////	679	/////////////////////////////////////////////////////////////////////////////
549		680
550	void	681	void
		682	connection::connection_established (const sockinfo &rsi)
		683	{
		684	if (!have_snd_auth || !have_rcv_auth)
		685	return;
		686
		687	si = rsi;
		688	protocol = rsi.prot;
		689
		690	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		691	conf->nodename, (const char *)rsi,
		692	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		693	PROTOCOL_MAJOR, prot_minor);
		694
		695	if (::conf.script_node_up)
		696	{
		697	run_script_cb *cb = new run_script_cb;
		698	cb->set<connection, &connection::script_node_up> (this);
		699	run_script_queued (cb, _("node-up command execution failed, continuing."));
		700	}
		701
		702	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		703	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		704
		705	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		706	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		707
		708	// make sure rekeying timeouts are slightly asymmetric
		709	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		710	rekey.start (rekey_interval, rekey_interval);
		711
		712	hmac_error = 0.;
		713
		714	keepalive.start (::conf.keepalive);
		715
		716	// send queued packets
		717	while (tap_packet *p = (tap_packet *)data_queue.get ())
		718	{
		719	if (p->len) send_data_packet (p);
		720	delete p;
		721	}
		722
		723	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
		724	{
		725	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		726	delete p;
		727	}
		728
		729	vpn->connection_established (this);
		730	}
		731
		732	void
551	connection::reset_si ()	733	connection::reset_si ()
552	{	734	{
		735	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	736	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		737	else
555	// mask out protocols we cannot establish	738	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	739	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	740	protocol = 0;
		741	}
558		742
559	si.set (conf, protocol);	743	si.set (conf, protocol);
560	}	744	}
561		745
562	// ensure sockinfo is valid, forward if necessary	746	// ensure sockinfo is valid, forward if necessary
563	const sockinfo &	747	const sockinfo &
564	connection::forward_si (const sockinfo &si) const	748	connection::forward_si (const sockinfo &si) const
565	{	749	{
566	if (!si.valid ())	750	if (!si.valid ())
567	{	751	{
568	connection *r = vpn->find_router ();	752	connection *r = vpn->find_router_for (this);
569		753
570	if (r)	754	if (r)
571	{	755	{
572	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	756	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
573	conf->nodename, r->conf->nodename);	757	conf->nodename, r->conf->nodename);
574	return r->si;	758	return r->si;
575	}	759	}
576	else	760	else
577	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	761	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
578	conf->nodename);	762	conf->nodename);
579	}	763	}
580		764
581	return si;	765	return si;
582	}	766	}
583		767
584	void	768	void
		769	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		770	{
		771	if (!vpn->send_vpn_packet (pkt, si, tos))
		772	reset_connection ("packet send error");
		773	}
		774
		775	void
585	connection::send_ping (const sockinfo &si, u8 pong)	776	connection::send_ping (const sockinfo &si, u8 pong)
586	{	777	{
587	ping_packet *pkt = new ping_packet;	778	ping_packet *pkt = new ping_packet;
588		779
589	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	780	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		781
		782	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
590	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	783	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
591		784
592	delete pkt;	785	delete pkt;
593	}	786	}
594		787
595	void	788	void
…		…
598	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	791	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
599	{	792	{
600	config_packet *pkt = new config_packet;	793	config_packet *pkt = new config_packet;
601		794
602	pkt->setup (vpn_packet::PT_RESET, conf->id);	795	pkt->setup (vpn_packet::PT_RESET, conf->id);
603	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);	796	send_vpn_packet (pkt, si, IPTOS_MINCOST);
604		797
605	delete pkt;	798	delete pkt;
606	}	799	}
607	}	800	}
608		801
609	void	802	void
610	connection::send_auth_request (const sockinfo &si, bool initiate)	803	connection::send_auth_request (const sockinfo &si, bool initiate)
611	{	804	{
612	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	805	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
613		806
614	rsachallenge chg;	807	generate_auth_data ();
		808	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
615		809
616	rsa_cache.gen (pkt->id, chg);
617
618	if (0 > RSA_public_encrypt (sizeof chg,
619	(unsigned char *)&chg, (unsigned char *)&pkt->encr,
620	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
621	fatal ("RSA_public_encrypt error");
622
623	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	810	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
624
625	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	811	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
626		812
627	delete pkt;	813	delete pkt;
628	}	814	}
629		815
630	void	816	void
631	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	817	connection::send_auth_response (const sockinfo &si)
632	{	818	{
633	auth_res_packet *pkt = new auth_res_packet (conf->id);	819	auth_res_packet *pkt = new auth_res_packet (conf->id);
634		820
635	pkt->id = id;	821	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		822	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
636		823
637	rsa_hash (id, chg, pkt->response);
638
639	pkt->hmac_set (octx);
640
641	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	824	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
642
643	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
644		826
645	delete pkt;	827	delete pkt;
646	}	828	}
647		829
648	void	830	void
649	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	831	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
650	{	832	{
651	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	833	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
652	conf->id, rid, (const char *)rsi);	834	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		835	conf->protocols);
653		836
654	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	837	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
655		838
656	r->hmac_set (octx);	839	r->hmac_set (octx);
657	vpn->send_vpn_packet (r, si);	840	send_vpn_packet (r, si);
658		841
659	delete r;	842	delete r;
660	}	843	}
661		844
662	void	845	inline void
663	connection::establish_connection_cb (time_watcher &w)	846	connection::establish_connection_cb (ev::timer &w, int revents)
664	{	847	{
665	if (ictx || conf == THISNODE	848	if (!(ictx && octx)
		849	&& conf != THISNODE
666	|| connectmode == conf_node::C_NEVER	850	&& connectmode != conf_node::C_NEVER
667	|| connectmode == conf_node::C_DISABLED)	851	&& connectmode != conf_node::C_DISABLED
668	w.at = TSTAMP_CANCEL;	852	&& !w.is_active ())
669	else if (w.at <= NOW)
670	{	853	{
671	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	854	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
672		855	// and stop trying. should probably be handled by a per-connection expire handler.
673	if (retry_int < 3600 * 8)	856	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		857	{
		858	reset_connection ("no demand");
674	retry_cnt++;	859	return;
		860	}
675		861
676	w.at = NOW + retry_int;	862	last_establish_attempt = ev_now ();
		863
		864	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		865	? (retry_cnt & 3) + 1
		866	: 1 << (retry_cnt >> 2));
677		867
678	reset_si ();	868	reset_si ();
679		869
680	if (si.prot && !si.host)	870	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
		871
		872	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		873	{
		874	/*TODO*/ /* start the timer so we don't recurse endlessly */
		875	w.start (1);
681	vpn->connect_request (conf->id);	876	vpn->send_connect_request (this);
		877	}
682	else	878	else
683	{	879	{
		880	if (si.valid ())
		881	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		882	conf->nodename, (const char *)si);
		883
684	const sockinfo &dsi = forward_si (si);	884	const sockinfo &dsi = forward_si (si);
		885
		886	slow = slow || (dsi.prot & PROT_SLOW);
685		887
686	if (dsi.valid () && auth_rate_limiter.can (dsi))	888	if (dsi.valid () && auth_rate_limiter.can (dsi))
687	{	889	{
688	if (retry_cnt < 4)	890	// use ping after the first few retries
		891	// TODO: on rekeys, the other node might not interpret ping correctly,
		892	// TODO: as it will still have a valid connection
		893	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
689	send_auth_request (dsi, true);	894	send_auth_request (dsi, true);
690	else	895	else
691	send_ping (dsi, 0);	896	send_ping (dsi, 0);
692	}	897	}
693	}	898	}
694	}
695	}
696		899
		900	retry_int *= slow ? 4. : 0.9;
		901
		902	if (retry_int < conf->max_retry)
		903	retry_cnt++;
		904	else
		905	retry_int = conf->max_retry;
		906
		907	w.start (retry_int);
		908	}
		909	}
		910
697	void	911	void
698	connection::reset_connection ()	912	connection::reset_connection (const char *reason)
699	{	913	{
700	if (ictx && octx)	914	if (ictx && octx)
701	{	915	{
702	slog (L_INFO, _("%s(%s): connection lost"),	916	slog (L_INFO, _("%s(%s): connection lost (%s)"),
703	conf->nodename, (const char *)si);	917	conf->nodename, (const char *)si, reason);
704		918
705	if (::conf.script_node_down)	919	if (::conf.script_node_down)
706	run_script (run_script_cb (this, &connection::script_node_down), false);	920	{
		921	run_script_cb *cb = new run_script_cb;
		922	cb->set<connection, &connection::script_node_down> (this);
		923	run_script_queued (cb, _("node-down command execution failed, continuing."));
		924	}
707	}	925	}
708		926
709	delete ictx; ictx = 0;	927	delete ictx; ictx = 0;
710	delete octx; octx = 0;	928	delete octx; octx = 0;
711		929
712	si.host= 0;	930	si.host = 0;
713		931
		932	have_snd_auth = false;
		933	have_rcv_auth = false;
		934	auth_expire = 0.;
		935
714	last_activity = 0;	936	last_activity = 0.;
		937	//last_si_change = 0.;
715	retry_cnt = 0;	938	retry_cnt = 0;
716		939
717	rekey.reset ();	940	rekey.stop ();
718	keepalive.reset ();	941	keepalive.stop ();
719	establish_connection.reset ();	942	establish_connection.stop ();
720	}	943	}
721		944
722	void	945	void
723	connection::shutdown ()	946	connection::shutdown ()
724	{	947	{
725	if (ictx && octx)	948	if (ictx && octx)
726	send_reset (si);	949	send_reset (si);
727		950
728	reset_connection ();	951	reset_connection ("shutdown");
729	}	952	}
730		953
731	void	954	// poor-man's rekeying
732	connection::rekey_cb (time_watcher &w)	955	inline void
		956	connection::rekey_cb (ev::timer &w, int revents)
733	{	957	{
734	w.at = TSTAMP_CANCEL;
735
736	reset_connection ();	958	reset_connection ("rekeying");
737	establish_connection ();	959	establish_connection ();
738	}	960	}
739		961
740	void	962	void
741	connection::send_data_packet (tap_packet *pkt, bool broadcast)	963	connection::send_data_packet (tap_packet *pkt)
742	{	964	{
743	vpndata_packet *p = new vpndata_packet;	965	vpndata_packet *p = new vpndata_packet;
744	int tos = 0;	966	int tos = 0;
745		967
746	if (conf->inherit_tos	968	// I am not hilarious about peeking into packets, but so be it.
747	&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP	969	if (conf->inherit_tos && pkt->is_ipv4 ())
748	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
749	tos = (*pkt)[15] & IPTOS_TOS_MASK;	970	tos = (*pkt)[15] & IPTOS_TOS_MASK;
750		971
751	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	972	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
752	vpn->send_vpn_packet (p, si, tos);	973	send_vpn_packet (p, si, tos);
753		974
754	delete p;	975	delete p;
755		976
756	if (oseqno > MAX_SEQNO)	977	if (oseqno > MAX_SEQNO)
757	rekey ();	978	rekey ();
758	}	979	}
759		980
760	void	981	void
		982	connection::post_inject_queue ()
		983	{
		984	// force a connection every now and when when packets are sent (max 1/s)
		985	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		986	establish_connection.stop ();
		987
		988	establish_connection ();
		989	}
		990
		991	void
761	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	992	connection::inject_data_packet (tap_packet *pkt)
762	{	993	{
763	if (ictx && octx)	994	if (ictx && octx)
764	send_data_packet (pkt, broadcast);	995	send_data_packet (pkt);
765	else	996	else
766	{	997	{
767	if (!broadcast)//DDDD
768	queue.put (new tap_packet (*pkt));	998	data_queue.put (new tap_packet (*pkt));
769		999	post_inject_queue ();
770	establish_connection ();
771	}	1000	}
772	}	1001	}
773		1002
		1003	void
774	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1004	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
775	{	1005	{
776	if (ictx && octx)	1006	if (ictx && octx)
777	vpn->send_vpn_packet (pkt, si, tos);	1007	send_vpn_packet (pkt, si, tos);
778	else	1008	else
779	establish_connection ();	1009	{
		1010	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
		1011	post_inject_queue ();
		1012	}
780	}	1013	}
781		1014
782	void	1015	void
783	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1016	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
784	{	1017	{
785	last_activity = NOW;	1018	last_activity = ev_now ();
786		1019
787	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1020	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
788	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1021	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1022
		1023	if (connectmode == conf_node::C_DISABLED)
		1024	return;
789		1025
790	switch (pkt->typ ())	1026	switch (pkt->typ ())
791	{	1027	{
792	case vpn_packet::PT_PING:	1028	case vpn_packet::PT_PING:
		1029	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1030
793	// we send pings instead of auth packets after some retries,	1031	// we send pings instead of auth packets after some retries,
794	// so reset the retry counter and establish a connection	1032	// so reset the retry counter and establish a connection
795	// when we receive a ping.	1033	// when we receive a ping.
796	if (!ictx)	1034	if (!ictx)
797	{	1035	{
798	if (auth_rate_limiter.can (rsi))	1036	if (auth_rate_limiter.can (rsi))
799	send_auth_request (rsi, true);	1037	send_auth_request (rsi, true);
800	}	1038	}
801	else	1039	else
		1040	// we would love to change the socket address here, but ping's aren't
		1041	// authenticated, so we best ignore it.
802	send_ping (rsi, 1); // pong	1042	send_ping (rsi, 1); // pong
803		1043
804	break;	1044	break;
805		1045
806	case vpn_packet::PT_PONG:	1046	case vpn_packet::PT_PONG:
		1047	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1048
		1049	// a PONG might mean that the other side doesn't really know
		1050	// about our desire for communication.
		1051	establish_connection ();
807	break;	1052	break;
808		1053
809	case vpn_packet::PT_RESET:	1054	case vpn_packet::PT_RESET:
		1055	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1056
		1057	if (ictx && octx)
810	{	1058	{
811	reset_connection ();	1059	reset_connection ("remote reset");
812		1060
813	config_packet *p = (config_packet *) pkt;	1061	config_packet *p = (config_packet *) pkt;
814		1062
815	if (!p->chk_config ())	1063	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
816	{
817	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
818	conf->nodename, (const char *)rsi);
819	connectmode = conf_node::C_DISABLED;
820	}
821	else if (connectmode == conf_node::C_ALWAYS)
822	establish_connection ();	1064	establish_connection ();
823	}	1065	}
		1066
824	break;	1067	break;
825		1068
826	case vpn_packet::PT_AUTH_REQ:	1069	case vpn_packet::PT_AUTH_REQ:
827	if (auth_rate_limiter.can (rsi))	1070	if (auth_rate_limiter.can (rsi))
828	{	1071	{
829	auth_req_packet *p = (auth_req_packet *) pkt;	1072	auth_req_packet *p = (auth_req_packet *)pkt;
830		1073
831	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1074	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1075	conf->nodename, p->initiate ? "initiate" : "reply",
		1076	p->protocols, p->features);
832		1077
833	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1078	if (memcmp (p->magic, MAGIC, 8))
		1079	{
		1080	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1081	conf->nodename, (const char *)rsi);
		1082	}
		1083	else if (p->chk_config (conf, rsi))
834	{	1084	{
835	if (p->prot_minor != PROTOCOL_MINOR)	1085	if (p->prot_minor != PROTOCOL_MINOR)
836	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1086	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
837	conf->nodename, (const char *)rsi,	1087	conf->nodename, (const char *)rsi,
838	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1088	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
839		1089
840	if (p->initiate)	1090	if (p->initiate)
		1091	{
841	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
842		1093
843	rsachallenge k;	1094	if (ictx && octx)
		1095	reset_connection ("reconnect");
		1096	}
844		1097
845	if (0 > RSA_private_decrypt (sizeof (p->encr),	1098	auth_data auth;
846	(unsigned char *)&p->encr, (unsigned char *)&k,	1099
847	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1100	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1101	{
848	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1102	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
849	conf->nodename, (const char *)rsi);	1103	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1104	}
850	else	1105	else
851	{	1106	{
852	retry_cnt = 0;	1107	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
853	establish_connection.start (NOW + 8); //? ;)
854	keepalive.reset ();
855	rekey.reset ();
856		1108
857	delete ictx;
858	ictx = 0;	1109	rcv_auth = auth;
		1110	have_rcv_auth = true;
859		1111
860	delete octx;	1112	send_auth_response (rsi);
861		1113
862	octx = new crypto_ctx (k, 1);	1114	if (chg)
863	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1115	{
864
865	conf->protocols = p->protocols;	1116	conf->protocols = p->protocols;
866	send_auth_response (rsi, p->id, k);	1117	features = p->features & config_packet::get_features ();
867		1118
		1119	connection_established (rsi);
868	break;	1120	}
869	}	1121	}
		1122
		1123	break;
870	}	1124	}
871		1125
872	send_reset (rsi);	1126	send_reset (rsi);
873	}	1127	}
874		1128
875	break;	1129	break;
876		1130
877	case vpn_packet::PT_AUTH_RES:	1131	case vpn_packet::PT_AUTH_RES:
878	{	1132	{
879	auth_res_packet *p = (auth_res_packet *) pkt;	1133	auth_res_packet *p = (auth_res_packet *)pkt;
880		1134
881	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1135	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
882		1136
883	if (p->chk_config ())	1137	auth_mac local_mac;
		1138	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1139
		1140	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
884	{	1141	{
885	if (p->prot_minor != PROTOCOL_MINOR)
886	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
887	conf->nodename, (const char *)rsi,
888	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
889
890	rsachallenge chg;
891
892	if (!rsa_cache.find (p->id, chg))
893	slog (L_ERR, _("%s(%s): unrequested auth response"),	1142	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
894	conf->nodename, (const char *)rsi);	1143	conf->nodename, (const char *)rsi);
895	else
896	{
897	crypto_ctx *cctx = new crypto_ctx (chg, 0);
898
899	if (!p->hmac_chk (cctx))
900	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
901	"could be an attack, or just corruption or an synchronization error"),
902	conf->nodename, (const char *)rsi);
903	else
904	{
905	rsaresponse h;
906
907	rsa_hash (p->id, chg, h);
908
909	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
910	{
911	prot_minor = p->prot_minor;
912
913	delete ictx; ictx = cctx;
914
915	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
916
917	si = rsi;
918	protocol = rsi.prot;
919
920	rekey.start (NOW + ::conf.rekey);
921	keepalive.start (NOW + ::conf.keepalive);
922
923	// send queued packets
924	while (tap_packet *p = queue.get ())
925	{
926	send_data_packet (p);
927	delete p;
928	}
929
930	connectmode = conf->connectmode;
931
932	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
933	conf->nodename, (const char *)rsi,
934	p->prot_major, p->prot_minor);
935
936	if (::conf.script_node_up)
937	run_script (run_script_cb (this, &connection::script_node_up), false);
938
939	break;
940	}
941	else
942	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
943	conf->nodename, (const char *)rsi);
944	}
945
946	delete cctx;
947	}	1144	}
		1145	else if (!have_snd_auth)
		1146	{
		1147	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1148
		1149	have_snd_auth = true;
		1150	connection_established (rsi);
948	}	1151	}
949	}	1152	}
950
951	send_reset (rsi);
952	break;	1153	break;
953		1154
954	case vpn_packet::PT_DATA_COMPRESSED:	1155	case vpn_packet::PT_DATA_COMPRESSED:
955	#if !ENABLE_COMPRESSION	1156	#if !ENABLE_COMPRESSION
956	send_reset (rsi);	1157	send_reset (rsi);
…		…
961		1162
962	if (ictx && octx)	1163	if (ictx && octx)
963	{	1164	{
964	vpndata_packet *p = (vpndata_packet *)pkt;	1165	vpndata_packet *p = (vpndata_packet *)pkt;
965		1166
966	if (rsi == si)	1167	if (!p->hmac_chk (ictx))
967	{	1168	{
		1169	// rekeying often creates temporary hmac auth floods
		1170	// we assume they don't take longer than a few seconds normally,
		1171	// and suppress messages and resets during that time.
		1172	//TODO: should be done per source address
968	if (!p->hmac_chk (ictx))	1173	if (!hmac_error)
969	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1174	{
970	"could be an attack, or just corruption or an synchronization error"),	1175	hmac_error = ev_now () + 3;
971	conf->nodename, (const char *)rsi);	1176	break;
		1177	}
		1178	else if (hmac_error >= ev_now ())
		1179	break; // silently suppress
972	else	1180	else
973	{	1181	{
974	u32 seqno;	1182	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
975	tap_packet *d = p->unpack (this, seqno);	1183	"could be an attack, or just corruption or a synchronization error."),
976		1184	conf->nodename, (const char *)rsi);
977	if (iseqno.recv_ok (seqno))
978	{	1185	// reset
979	vpn->tap->send (d);
980
981	if (p->dst () == 0) // re-broadcast
982	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
983	{
984	connection *c = *i;
985
986	if (c->conf != THISNODE && c->conf != conf)
987	c->inject_data_packet (d);
988	}
989
990	delete d;
991
992	break;
993	}
994	}	1186	}
995	}	1187	}
996	else	1188	else
997	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);	1189	{
		1190	u32 seqno;
		1191	tap_packet *d = p->unpack (this, seqno);
		1192	int seqclass = iseqno.seqno_classify (seqno);
		1193
		1194	hmac_error = 0;
		1195
		1196	if (seqclass == 0) // ok
		1197	{
		1198	vpn->tap->send (d);
		1199
		1200	if (si != rsi)
		1201	{
		1202	// fast re-sync on source address changes, useful especially for tcp/ip
		1203	//if (last_si_change < ev_now () + 5.)
		1204	// {
		1205	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1206	conf->nodename, (const char *)si, (const char *)rsi);
		1207
		1208	si = rsi;
		1209
		1210	if (::conf.script_node_change)
		1211	{
		1212	run_script_cb *cb = new run_script_cb;
		1213	cb->set<connection, &connection::script_node_change> (this);
		1214	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1215	}
		1216
		1217	// }
		1218	//else
		1219	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1220	// conf->nodename, (const char *)si, (const char *)rsi);
		1221	}
		1222	}
		1223	else if (seqclass == 1) // far history
		1224	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1225	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1226	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1227	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1228	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1229	else if (seqclass == 3) // reset
		1230	{
		1231	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1232	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1233	send_reset (rsi);
		1234	}
		1235
		1236	delete d;
		1237	break;
		1238	}
998	}	1239	}
999		1240
1000	send_reset (rsi);	1241	send_reset (rsi);
1001	break;	1242	break;
1002		1243
1003	case vpn_packet::PT_CONNECT_REQ:	1244	case vpn_packet::PT_CONNECT_REQ:
1004	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1245	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1005	{	1246	{
1006	connect_req_packet *p = (connect_req_packet *) pkt;	1247	connect_req_packet *p = (connect_req_packet *)pkt;
1007		1248
1008	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1249	if (p->id > 0 && p->id <= vpn->conns.size ())
1009	connection *c = vpn->conns[p->id - 1];
1010	conf->protocols = p->protocols;
1011
1012	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1013	conf->id, p->id, c->ictx && c->octx);
1014
1015	if (c->ictx && c->octx)
1016	{	1250	{
		1251	connection *c = vpn->conns[p->id - 1];
		1252	conf->protocols = p->protocols;
		1253
		1254	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1255	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1256	p->protocols,
		1257	c->ictx && c->octx);
		1258
		1259	if (c->ictx && c->octx)
		1260	{
1017	// send connect_info packets to both sides, in case one is	1261	// send connect_info packets to both sides, in case one is
1018	// behind a nat firewall (or both ;)	1262	// behind a nat firewall (or both ;)
1019	c->send_connect_info (conf->id, si, conf->protocols);	1263	c->send_connect_info (conf->id, si, conf->protocols);
1020	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1264	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1265	}
		1266	else
		1267	c->establish_connection ();
1021	}	1268	}
		1269	else
		1270	slog (L_WARN,
		1271	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1272	p->id);
1022	}	1273	}
1023		1274
1024	break;	1275	break;
1025		1276
1026	case vpn_packet::PT_CONNECT_INFO:	1277	case vpn_packet::PT_CONNECT_INFO:
1027	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1278	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1028	{	1279	{
1029	connect_info_packet *p = (connect_info_packet *) pkt;	1280	connect_info_packet *p = (connect_info_packet *)pkt;
1030		1281
1031	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1282	if (p->id > 0 && p->id <= vpn->conns.size ())
1032		1283	{
1033	connection *c = vpn->conns[p->id - 1];	1284	connection *c = vpn->conns[p->id - 1];
1034		1285
1035	c->conf->protocols = p->protocols;	1286	c->conf->protocols = p->protocols;
1036	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1287	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1037	p->si.upgrade_protocol (protocol, c->conf);	1288	p->si.upgrade_protocol (protocol, c->conf);
1038		1289
1039	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1290	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1040	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1291	conf->nodename,
		1292	vpn->conns[p->id - 1]->conf->nodename,
		1293	(const char *)p->si,
		1294	p->protocols,
		1295	protocol,
		1296	p->si.supported_protocols (c->conf),
		1297	!c->ictx && !c->octx);
1041		1298
1042	const sockinfo &dsi = forward_si (p->si);	1299	const sockinfo &dsi = forward_si (p->si);
1043		1300
1044	if (dsi.valid ())	1301	if (dsi.valid ())
1045	c->send_auth_request (dsi, true);	1302	c->send_auth_request (dsi, true);
		1303	else
		1304	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1305	vpn->conns[p->id - 1]->conf->nodename,
		1306	(const char *)p->si);
		1307	}
		1308	else
		1309	slog (L_WARN,
		1310	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1311	p->id);
1046	}	1312	}
1047		1313
1048	break;	1314	break;
1049		1315
1050	default:	1316	default:
1051	send_reset (rsi);	1317	send_reset (rsi);
1052	break;	1318	break;
1053	}	1319	}
1054	}	1320	}
1055		1321
1056	void connection::keepalive_cb (time_watcher &w)	1322	inline void
		1323	connection::keepalive_cb (ev::timer &w, int revents)
1057	{	1324	{
1058	if (NOW >= last_activity + ::conf.keepalive + 30)	1325	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1326
		1327	if (when >= 0)
		1328	w.start (when);
		1329	else if (when < -15)
1059	{	1330	{
1060	reset_connection ();	1331	reset_connection ("keepalive overdue");
1061	establish_connection ();	1332	establish_connection ();
1062	}	1333	}
1063	else if (NOW < last_activity + ::conf.keepalive)
1064	w.at = last_activity + ::conf.keepalive;
1065	else if (conf->connectmode != conf_node::C_ONDEMAND	1334	else if (conf->connectmode != conf_node::C_ONDEMAND
1066	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1335	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1067	{	1336	{
		1337	w.start (3);
1068	send_ping (si);	1338	send_ping (si);
1069	w.at = NOW + 5;
1070	}	1339	}
		1340	else if (when >= -10)
		1341	// hold ondemand connections implicitly a few seconds longer
		1342	// should delete octx, though, or something like that ;)
		1343	w.start (when + 10);
1071	else	1344	else
1072	reset_connection ();	1345	reset_connection ("keepalive timeout");
1073	}	1346	}
1074		1347
		1348	void
1075	void connection::connect_request (int id)	1349	connection::send_connect_request (int id)
1076	{	1350	{
1077	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1351	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1078		1352
1079	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1353	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1354	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1355	THISNODE->protocols);
1080	p->hmac_set (octx);	1356	p->hmac_set (octx);
1081	vpn->send_vpn_packet (p, si);	1357	send_vpn_packet (p, si);
1082		1358
1083	delete p;	1359	delete p;
1084	}	1360	}
1085		1361
1086	void connection::script_node ()	1362	void
		1363	connection::script_init_env (const char *ext)
1087	{	1364	{
1088	vpn->script_if_up ();
1089
1090	char *env;	1365	char *env;
		1366	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1367	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1368	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1369	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1370	conf->id & 0xff); putenv (env);
		1371	}
		1372
		1373	void
		1374	connection::script_init_connect_env ()
		1375	{
		1376	vpn->script_init_env ();
		1377
		1378	char *env;
1091	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1379	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1380	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1092	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1381	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1093	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1382	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1094	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1383	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1095	}	1384	}
1096		1385
		1386	inline const char *
1097	const char *connection::script_node_up ()	1387	connection::script_node_up ()
1098	{	1388	{
1099	script_node ();	1389	script_init_connect_env ();
1100		1390
1101	putenv ("STATE=up");	1391	putenv ((char *)"STATE=up");
1102		1392
		1393	char *filename;
		1394	asprintf (&filename,
		1395	"%s/%s",
		1396	confbase,
1103	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1397	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1104	}
1105		1398
		1399	return filename;
		1400	}
		1401
		1402	inline const char *
		1403	connection::script_node_change ()
		1404	{
		1405	script_init_connect_env ();
		1406
		1407	putenv ((char *)"STATE=change");
		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1414
		1415	return filename;
		1416	}
		1417
		1418	inline const char *
1106	const char *connection::script_node_down ()	1419	connection::script_node_down ()
1107	{	1420	{
1108	script_node ();	1421	script_init_connect_env ();
1109		1422
1110	putenv ("STATE=down");	1423	putenv ((char *)"STATE=down");
1111		1424
1112	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1425	char *filename;
1113	}	1426	asprintf (&filename,
		1427	"%s/%s",
		1428	confbase,
		1429	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1114		1430
		1431	return filename;
		1432	}
		1433
1115	connection::connection(struct vpn *vpn_)	1434	connection::connection (struct vpn *vpn, conf_node *conf)
1116	: vpn(vpn_)	1435	: vpn(vpn), conf(conf),
1117	, rekey (this, &connection::rekey_cb)	1436	#if ENABLE_DNS
1118	, keepalive (this, &connection::keepalive_cb)	1437	dns (0),
		1438	#endif
		1439	data_queue(conf->max_ttl, conf->max_queue + 1),
		1440	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1441	{
		1442	rekey .set<connection, &connection::rekey_cb > (this);
		1443	keepalive .set<connection, &connection::keepalive_cb > (this);
1119	, establish_connection (this, &connection::establish_connection_cb)	1444	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1120	{	1445
		1446	last_establish_attempt = 0.;
1121	octx = ictx = 0;	1447	octx = ictx = 0;
1122	retry_cnt = 0;
1123		1448
1124	connectmode = conf_node::C_ALWAYS; // initial setting	1449	connectmode = conf->connectmode;
		1450
		1451	// queue a dummy packet to force an initial connection attempt
		1452	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1453	vpn_queue.put (new net_packet);
		1454
1125	reset_connection ();	1455	reset_connection ("startup");
1126	}	1456	}
1127		1457
1128	connection::~connection ()	1458	connection::~connection ()
1129	{	1459	{
1130	shutdown ();	1460	shutdown ();
1131	}	1461	}
1132		1462
		1463	void
1133	void connection_init ()	1464	connection_init ()
1134	{	1465	{
1135	auth_rate_limiter.clear ();	1466	auth_rate_limiter.clear ();
1136	reset_rate_limiter.clear ();	1467	reset_rate_limiter.clear ();
1137	}	1468	}
1138		1469

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