[ViewVC] Diff of: cvs/gvpe/src/connection.C

Comparing gvpe/src/connection.C (file contents):
Revision 1.15 by pcg, Fri Aug 8 10:58:28 2003 UTC vs.
Revision 1.107 by root, Fri Sep 20 11:57:03 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
		38	#include <openssl/opensslv.h>
27	#include <openssl/rand.h>	39	#include <openssl/rand.h>
28	#include <openssl/evp.h>	40	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
30	#include <openssl/err.h>	42	#include <openssl/err.h>
31		43
32	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
33		50
34	#include "conf.h"	51	#include "conf.h"
35	#include "slog.h"	52	#include "slog.h"
36	#include "device.h"	53	#include "device.h"
37	#include "vpn.h"	54	#include "vpn.h"
38	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
39		57
40	#if !HAVE_RAND_PSEUDO_BYTES	58	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		59
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		62
		63	#define ULTRA_FAST 1
		64	#define HLOG 15
		65	#include "lzf/lzf.h"
		66	#include "lzf/lzf_c.c"
		67	#include "lzf/lzf_d.c"
		68
		69	//////////////////////////////////////////////////////////////////////////////
		70
		71	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		72	static ev::child rs_child_ev;
		73
		74	namespace
		75	{
		76	void // c++ requires external linkage here, apparently :(
		77	rs_child_cb (ev::child &w, int revents)
		78	{
		79	w.stop ();
		80
		81	if (rs_queue.empty ())
		82	return;
		83
		84	pid_t pid = run_script (*rs_queue.front ().first, false);
		85	if (pid)
		86	{
		87	w.set (pid);
		88	w.start ();
		89	}
		90	else
		91	slog (L_WARN, rs_queue.front ().second);
		92
		93	delete rs_queue.front ().first;
		94	rs_queue.pop ();
		95	}
		96	};
		97
		98	// despite the fancy name, this is quite a hack
		99	static void
		100	run_script_queued (run_script_cb cb, const char warnmsg)
		101	{
		102	rs_queue.push (std::make_pair (cb, warnmsg));
		103
		104	if (!rs_child_ev.is_active ())
		105	{
		106	rs_child_ev.set<rs_child_cb> ();
		107	rs_child_ev ();
		108	}
		109	}
		110
		111	//////////////////////////////////////////////////////////////////////////////
45		112
46	struct crypto_ctx	113	struct crypto_ctx
47	{	114	{
48	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	116	HMAC_CTX hctx;
50		117
51	crypto_ctx (const rsachallenge &challenge, int enc);	118	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	119	~crypto_ctx ();
53	};	120	};
54		121
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	122	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	123	{
		124	ecdh_key s;
		125
		126	curve25519_combine (a, b, s);
		127
		128	{
		129	u8 mac_key[MAC_KEYSIZE];
		130	static const unsigned char mac_info[] = "gvpe mac key";
		131
		132	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		133	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		134	kdf.extract (s, sizeof (s));
		135	kdf.extract_done (HKDF_PRF_HASH ());
		136	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		137
		138	HMAC_CTX_init (&hctx);
		139	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		140	}
		141
		142	{
		143	u8 cipher_key[CIPHER_KEYSIZE];
		144	static const unsigned char cipher_info[] = "gvpe cipher key";
		145
		146	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		147	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		148	kdf.extract (s, sizeof (s));
		149	kdf.extract_done (HKDF_PRF_HASH ());
		150	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		151
57	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	154	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	155	}
62		156
63	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
64	{	158	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
67	}	161	}
68		162
		163	static inline void
		164	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		165	{
		166	if (RSA_public_encrypt (sizeof (auth.rsa),
		167	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		168	key, RSA_PKCS1_OAEP_PADDING) < 0)
		169	fatal ("RSA_public_encrypt error");
		170
		171	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		172	}
		173
		174	static inline bool
		175	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		176	{
		177	u8 rsa_decrypt[RSA_KEYLEN];
		178
		179	if (RSA_private_decrypt (sizeof (encr.rsa),
		180	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		181	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		182	return 0;
		183
		184	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		185	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		186
		187	return 1;
		188	}
		189
69	static void	190	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	192	{
72	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	197	}
81		198
82	struct rsa_entry {	199	void
83	tstamp expire;	200	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	201	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	203	{
		204	// request data
		205	rand_fill (snd_auth.rsa);
		206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		207
132	} rsa_cache;	208	// eventual response data
133		209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	210	}
140	w.at = NOW + RSA_TTL;
141		211
142	for (iterator i = begin (); i != end (); )	212	// every use prolongs the expiry
143	if (i->expire <= NOW)	213	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	214	}
149		215
150	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
151		217
152	void pkt_queue::put (net_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
153	{	220	{
154	if (queue[i])	221	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		222
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	net_packet *pkt_queue::get ()
166	{
167	net_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	223	i = 0;
182	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	227	}
184		228
185	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
186	{	230	{
187	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
188	delete queue[i];	234	delete [] queue;
189	}	235	}
190		236
		237	void
		238	pkt_queue::expire_cb (ev::timer &w, int revents)
		239	{
		240	ev_tstamp expire = ev_now () - max_ttl;
		241
		242	for (;;)
		243	{
		244	if (empty ())
		245	break;
		246
		247	double diff = queue[j].tstamp - expire;
		248
		249	if (diff >= 0.)
		250	{
		251	w.start (diff > 0.5 ? diff : 0.5);
		252	break;
		253	}
		254
		255	delete get ();
		256	}
		257	}
		258
		259	void
		260	pkt_queue::put (net_packet *p)
		261	{
		262	ev_tstamp now = ev_now ();
		263
		264	// start expiry timer
		265	if (empty ())
		266	expire.start (max_ttl);
		267
		268	int ni = i + 1 == max_queue ? 0 : i + 1;
		269
		270	if (ni == j)
		271	delete get ();
		272
		273	queue[i].pkt = p;
		274	queue[i].tstamp = now;
		275
		276	i = ni;
		277	}
		278
		279	net_packet *
		280	pkt_queue::get ()
		281	{
		282	if (empty ())
		283	return 0;
		284
		285	net_packet *p = queue[j].pkt;
		286	queue[j].pkt = 0;
		287
		288	j = j + 1 == max_queue ? 0 : j + 1;
		289
		290	return p;
		291	}
		292
191	struct net_rateinfo {	293	struct net_rateinfo
		294	{
192	u32 host;	295	u32 host;
193	double pcnt, diff;	296	double pcnt, diff;
194	tstamp last;	297	tstamp last;
195	};	298	};
196		299
197	// only do action once every x seconds per host whole allowing bursts.	300	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	301	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	302	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	303	struct net_rate_limiter : list<net_rateinfo>
201	{	304	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	305	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	306	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	307	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	308	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		309
207	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	311	bool can (u32 host);
209	};	312	};
210		313
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		315
		316	bool
213	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
214	{	318	{
215	iterator i;	319	iterator i;
216		320
217	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
218	if (i->host == host)	322	if (i->host == host)
219	break;	323	break;
220	else if (i->last < NOW - EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	325	i = erase (i);
222	else	326	else
223	i++;	327	i++;
224		328
225	if (i == end ())	329	if (i == end ())
226	{	330	{
227	net_rateinfo ri;	331	net_rateinfo ri;
228		332
229	ri.host = host;	333	ri.host = host;
230	ri.pcnt = 1.;	334	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	335	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	336	ri.last = ev_now ();
233		337
234	push_front (ri);	338	push_front (ri);
235		339
236	return true;	340	return true;
237	}	341	}
238	else	342	else
239	{	343	{
240	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
241	erase (i);	345	erase (i);
242		346
243	ri.pcnt = ri.pcnt * ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		349
246	ri.last = NOW;	350	ri.last = ev_now ();
247		351
248	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
249		353
250	bool send = dif > CUTOFF;	354	bool send = dif > NRL_CUTOFF;
251		355
252	if (dif > MAXDIF)	356	if (dif > NRL_MAXDIF)
253	{	357	{
254	ri.pcnt = 1.;	358	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	359	ri.diff = NRL_MAXDIF;
256	}	360	}
257	else if (send)	361	else if (send)
258	ri.pcnt++;	362	ri.pcnt++;
259		363
260	push_front (ri);	364	push_front (ri);
263	}	367	}
264	}	368	}
265		369
266	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
267		371
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
269
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
271	{	374	{
272	unsigned int xlen;
273
274	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
275		376
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
278	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
280	}	380	}
281		381
282	void	382	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	384	{
285	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		386	hmac_gen (ctx, hmac_digest);
287	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
288	}	388	}
289		389
290	bool	390	bool
291	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
292	{	392	{
293	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
294		394	hmac_gen (ctx, hmac_digest);
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	396	}
297		397
		398	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	400	{
300	type = type_;	401	type = type_;
301		402
302	int src = THISNODE->id;	403	int src = THISNODE->id;
303		404
…		…
307	}	408	}
308		409
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		412
312	struct vpndata_packet:vpn_packet	413	struct vpndata_packet : vpn_packet
		414	{
		415	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		416
		417	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		418	tap_packet unpack (connection conn, u32 &seqno);
		419
		420	private:
		421	const u32 data_hdr_size () const
313	{	422	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315
316	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
317	tap_packet unpack (connection conn, u32 &seqno);
318	private:
319
320	const u32 data_hdr_size () const
321	{
322	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	424	}
		425	};
325		426
326	void	427	void
327	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	428	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
328	{	429	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	431	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
332		433
333	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
335	u32 cl;
336		436
		437	if (conn->features & FEATURE_COMPRESSION)
		438	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		440
338	if (cl)	441	if (cl)
339	{	442	{
340	type = PT_DATA_COMPRESSED;	443	type = PT_DATA_COMPRESSED;
341	d = cdata;	444	d = cdata;
342	l = cl + 2;	445	l = cl + 2;
343		446
344	d[0] = cl >> 8;	447	d[0] = cl >> 8;
345	d[1] = cl;	448	d[1] = cl;
		449	}
346	}	450	}
347	#endif	451	#endif
348		452
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		454
351	struct {	455	struct {
352	#if RAND_SIZE	456	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
354	#endif	458	#endif
355	u32 seqno;	459	u32 seqno;
356	} datahdr;	460	} datahdr;
357		461
358	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	463	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	464	// NB: a constant (per session) random prefix
		465	// is likely enough, but we don't take any chances.
		466	conn->oiv.get (datahdr.rnd, RAND_SIZE);
361	#endif	467	#endif
362		468
363	EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	472	outl += outl2;
367		473
368	EVP_EncryptUpdate (cctx,	474	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	475	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	476	(unsigned char *) d, l));
371	outl += outl2;	477	outl += outl2;
372		478
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	479	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	480	outl += outl2;
375		481
376	len = outl + data_hdr_size ();	482	len = outl + data_hdr_size ();
377		483
378	set_hdr (type, dst);	484	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	493	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
389	u8 *d;	495	u8 *d;
390	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
391		497
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		499
394	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
396		502
397	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	504	d = cdata;
399	else	505	else
400	#endif	506	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
402		508
403	/* this overwrites part of the src mac, but we fix that later */	509	// we play do evil games with the struct layout atm.
		510	// pending better solutions, we at least do some verification.
		511	// this is fine, as we left ISO territory long ago.
		512	require (DATAHDR <= 16);
		513	require ((u8 )(&p->len + 1) == &(p)[0]);
		514
		515	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	517	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	518	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	519	outl += outl2;
408		520
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	521	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	522	outl += outl2;
411		523
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	524	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		525
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	551	}
440	};	552	};
441		553
442	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
443	{	555	{
444	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
450		560
451	const u8 curflags () const	561	void setup (ptype type, int dst);
		562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		563
		564	static u8 get_features ()
452	{	565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f \|= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f \|= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f \|= FEATURE_BRIDGING;
		575	#endif
453	return 0x80	576	return f;
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	577	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	578	};
460		579
		580	void
461	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
462	{	582	{
463	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	586	flags = 0;
467	flags = curflags ();	587	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	592	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		593	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
473		594
474	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	596	set_hdr (type, dst);
476	}	597	}
477		598
478	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	601	{
480	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
481	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
482	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
483	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
484	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
485	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
486	else if (flags != curflags ())
487	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
488	else if (challengelen != sizeof (rsachallenge))
489	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
490	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
491	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
492	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
493	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
494	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
495	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	612	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		613	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		614	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		615	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		616	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
496	else	617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		620
		621	if (cmp > 0)
		622	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		623	conf->nodename, (const char *)rsi);
		624	else if (cmp == 0)
497	return true;	625	return true;
		626	}
498		627
499	return false;	628	return false;
500	}	629	}
501		630
502	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
503	{	632	{
504	char magic[8];	633	char magic[8];
505	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
506	u8 protocols; // supported protocols (will get patches on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
507	u8 pad2, pad3;	636	u8 pad2, pad3;
508	rsaid id;	637	auth_encr encr;
509	rsaencrdata encr;
510		638
511	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
512	{	640	{
513	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
514	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
515	initiate = !!initiate_;	643	initiate = !!initiate_;
516	protocols = protocols_;	644	protocols = protocols_;
517		645
518	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
519	}	647	}
520	};	648	};
521		649
522	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
523	{	651	{
524	rsaid id;
525	u8 pad1, pad2, pad3;
526	u8 response_len; // encrypted length
527	rsaresponse response;	652	auth_response response;
528		653
529	auth_res_packet (int dst)	654	auth_res_packet (int dst)
530	{	655	{
531	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
532		657
533	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
534	}	659	}
535	};	660	};
536		661
…		…
566	};	691	};
567		692
568	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
569		694
570	void	695	void
571	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
572	{	697	{
		698	if (!have_snd_auth \|\| !have_rcv_auth)
		699	return;
		700
		701	si = rsi;
		702	protocol = rsi.prot;
		703
		704	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		705	conf->nodename, (const char *)rsi,
		706	is_direct ? "direct" : "forwarded",
		707	PROTOCOL_MAJOR, prot_minor);
		708
		709	if (::conf.script_node_up)
		710	{
		711	run_script_cb *cb = new run_script_cb;
		712	cb->set<connection, &connection::script_node_up> (this);
		713	run_script_queued (cb, _("node-up command execution failed, continuing."));
		714	}
		715
		716	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		717	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		718
		719	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		720	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		721
		722	oiv.reset ();
		723
		724	// make sure rekeying timeouts are slightly asymmetric
		725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		726	rekey.start (rekey_interval, rekey_interval);
		727
		728	keepalive.start (::conf.keepalive);
		729
		730	// send queued packets
573	if (ictx && octx)	731	if (ictx && octx)
574	{	732	{
575	connectmode = conf->connectmode;	733	while (tap_packet p = (tap_packet )data_queue.get ())
576
577	rekey.start (NOW + ::conf.rekey);
578	keepalive.start (NOW + ::conf.keepalive);
579
580	// send queued packets
581	if (ictx && octx)
582	{	734	{
583	while (tap_packet p = (tap_packet )data_queue.get ())
584	{
585	send_data_packet (p);	735	if (p->len) send_data_packet (p);
586	delete p;	736	delete p;
587	}
588
589	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
590	{
591	send_vpn_packet (p, si, IPTOS_RELIABILITY);
592	delete p;
593	}
594	}	737	}
		738
		739	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		740	{
		741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		742	delete p;
		743	}
595	}	744	}
		745
		746	vpn->connection_established (this);
		747	}
		748
		749	void
		750	connection::reset_si ()
		751	{
		752	if (vpn->can_direct (THISNODE, conf))
		753	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
596	else	754	else
597	{	755	{
598	retry_cnt = 0;	756	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
599	establish_connection.start (NOW + 5);	757	protocol = 0;
600	keepalive.reset ();
601	rekey.reset ();
602	}	758	}
603	}
604
605	void
606	connection::reset_si ()
607	{
608	protocol = best_protocol (THISNODE->protocols & conf->protocols);
609
610	// mask out protocols we cannot establish
611	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
612	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
613		759
614	si.set (conf, protocol);	760	si.set (conf, protocol);
		761
		762	is_direct = si.valid ();
615	}	763	}
616		764
617	// ensure sockinfo is valid, forward if necessary	765	// ensure sockinfo is valid, forward if necessary
618	const sockinfo &	766	const sockinfo &
619	connection::forward_si (const sockinfo &si) const	767	connection::forward_si (const sockinfo &si) const
620	{	768	{
621	if (!si.valid ())	769	if (!si.valid ())
622	{	770	{
623	connection *r = vpn->find_router ();	771	connection *r = vpn->find_router_for (this);
624		772
625	if (r)	773	if (r)
626	{	774	{
627	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	775	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
628	conf->nodename, r->conf->nodename);	776	conf->nodename, r->conf->nodename);
629	return r->si;	777	return r->si;
630	}	778	}
631	else	779	else
632	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	780	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
633	conf->nodename);	781	conf->nodename);
634	}	782	}
635		783
636	return si;	784	return si;
637	}	785	}
…		…
647	connection::send_ping (const sockinfo &si, u8 pong)	795	connection::send_ping (const sockinfo &si, u8 pong)
648	{	796	{
649	ping_packet *pkt = new ping_packet;	797	ping_packet *pkt = new ping_packet;
650		798
651	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	799	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		800
		801	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
652	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	802	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
653		803
654	delete pkt;	804	delete pkt;
655	}	805	}
656		806
…		…
671	void	821	void
672	connection::send_auth_request (const sockinfo &si, bool initiate)	822	connection::send_auth_request (const sockinfo &si, bool initiate)
673	{	823	{
674	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	824	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
675		825
676	rsachallenge chg;	826	generate_auth_data ();
		827	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
677		828
678	rsa_cache.gen (pkt->id, chg);
679
680	if (0 > RSA_public_encrypt (sizeof chg,
681	(unsigned char )&chg, (unsigned char )&pkt->encr,
682	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
683	fatal ("RSA_public_encrypt error");
684
685	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	829	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
686
687	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	830	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
688		831
689	delete pkt;	832	delete pkt;
690	}	833	}
691		834
692	void	835	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	836	connection::send_auth_response (const sockinfo &si)
694	{	837	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	838	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		839
697	pkt->id = id;	840	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		841	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
698		842
699	rsa_hash (id, chg, pkt->response);
700
701	pkt->hmac_set (octx);
702
703	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	843	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
704
705	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	844	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
706		845
707	delete pkt;	846	delete pkt;
708	}	847	}
709		848
710	void	849	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	850	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	851	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	852	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	853	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		854	conf->protocols);
715		855
716	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	856	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717		857
718	r->hmac_set (octx);	858	r->hmac_set (octx);
719	send_vpn_packet (r, si);	859	send_vpn_packet (r, si);
720		860
721	delete r;	861	delete r;
722	}	862	}
723		863
724	void	864	inline void
725	connection::establish_connection_cb (time_watcher &w)	865	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	866	{
727	if (ictx \|\| conf == THISNODE	867	if (!(ictx && octx)
		868	&& conf != THISNODE
728	\|\| connectmode == conf_node::C_NEVER	869	&& connectmode != conf_node::C_NEVER
729	\|\| connectmode == conf_node::C_DISABLED)	870	&& connectmode != conf_node::C_DISABLED
730	w.at = TSTAMP_CANCEL;	871	&& !w.is_active ())
731	else if (w.at <= NOW)
732	{	872	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	873	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		874	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	875	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		876	{
		877	reset_connection ();
736	retry_cnt++;	878	return;
		879	}
737		880
738	w.at = NOW + retry_int;	881	last_establish_attempt = ev_now ();
		882
		883	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		884	? (retry_cnt & 3) + 1
		885	: 1 << (retry_cnt >> 2));
739		886
740	reset_si ();	887	reset_si ();
741		888
742	if (si.prot && !si.host)	889	bool slow = si.prot & PROT_SLOW;
		890
		891	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		892	{
		893	/TODO/ /* start the timer so we don't recurse endlessly */
		894	w.start (1);
743	vpn->send_connect_request (conf->id);	895	vpn->send_connect_request (this);
		896	}
744	else	897	else
745	{	898	{
		899	if (si.valid ())
		900	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		901	conf->nodename, (const char *)si);
		902
746	const sockinfo &dsi = forward_si (si);	903	const sockinfo &dsi = forward_si (si);
		904
		905	slow = slow \|\| (dsi.prot & PROT_SLOW);
747		906
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	907	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	908	{
750	if (retry_cnt < 4)	909	if (retry_cnt < 4)
751	send_auth_request (dsi, true);	910	send_auth_request (dsi, true);
752	else	911	else
753	send_ping (dsi, 0);	912	send_ping (dsi, 0);
754	}	913	}
755	}	914	}
		915
		916	retry_int *= slow ? 8. : 0.9;
		917
		918	if (retry_int < conf->max_retry)
		919	retry_cnt++;
		920	else
		921	retry_int = conf->max_retry;
		922
		923	w.start (retry_int);
756	}	924	}
757	}	925	}
758		926
759	void	927	void
760	connection::reset_connection ()	928	connection::reset_connection ()
…		…
763	{	931	{
764	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost"),
765	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si);
766		934
767	if (::conf.script_node_down)	935	if (::conf.script_node_down)
768	run_script (run_script_cb (this, &connection::script_node_down), false);	936	{
		937	run_script_cb *cb = new run_script_cb;
		938	cb->set<connection, &connection::script_node_down> (this);
		939	run_script_queued (cb, _("node-down command execution failed, continuing."));
		940	}
769	}	941	}
770		942
771	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
772	delete octx; octx = 0;	944	delete octx; octx = 0;
773		945
774	si.host= 0;	946	si.host = 0;
775		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
776	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
777	retry_cnt = 0;	954	retry_cnt = 0;
778		955
779	rekey.reset ();	956	rekey.stop ();
780	keepalive.reset ();	957	keepalive.stop ();
781	establish_connection.reset ();	958	establish_connection.stop ();
782	}	959	}
783		960
784	void	961	void
785	connection::shutdown ()	962	connection::shutdown ()
786	{	963	{
…		…
788	send_reset (si);	965	send_reset (si);
789		966
790	reset_connection ();	967	reset_connection ();
791	}	968	}
792		969
793	void	970	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
795	{	973	{
796	w.at = TSTAMP_CANCEL;
797
798	reset_connection ();	974	reset_connection ();
799	establish_connection ();	975	establish_connection ();
800	}	976	}
801		977
802	void	978	void
803	connection::send_data_packet (tap_packet *pkt, bool broadcast)	979	connection::send_data_packet (tap_packet *pkt)
804	{	980	{
805	vpndata_packet *p = new vpndata_packet;	981	vpndata_packet *p = new vpndata_packet;
806	int tos = 0;	982	int tos = 0;
807		983
808	// I am not hilarious about peeking into packets, but so be it.	984	// I am not hilarious about peeking into packets, but so be it.
809	if (conf->inherit_tos	985	if (conf->inherit_tos && pkt->is_ipv4 ())
810	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
811	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
812	tos = (*pkt)[15] & IPTOS_TOS_MASK;	986	tos = (*pkt)[15] & IPTOS_TOS_MASK;
813		987
814	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	988	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815	send_vpn_packet (p, si, tos);	989	send_vpn_packet (p, si, tos);
816		990
817	delete p;	991	delete p;
818		992
819	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
820	rekey ();	994	rekey ();
821	}	995	}
822		996
823	void	997	void
		998	connection::post_inject_queue ()
		999	{
		1000	// force a connection every now and when when packets are sent (max 1/s)
		1001	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		1002	establish_connection.stop ();
		1003
		1004	establish_connection ();
		1005	}
		1006
		1007	void
824	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1008	connection::inject_data_packet (tap_packet *pkt)
825	{	1009	{
826	if (ictx && octx)	1010	if (ictx && octx)
827	send_data_packet (pkt, broadcast);	1011	send_data_packet (pkt);
828	else	1012	else
829	{	1013	{
830	if (!broadcast)//DDDD
831	data_queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
832		1015	post_inject_queue ();
833	establish_connection ();
834	}	1016	}
835	}	1017	}
836		1018
		1019	void
837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
838	{	1021	{
839	if (ictx && octx)	1022	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	1023	send_vpn_packet (pkt, si, tos);
841	else	1024	else
842	{	1025	{
843	vpn_queue.put (new vpn_packet (*pkt));	1026	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
844		1027	post_inject_queue ();
845	establish_connection ();
846	}	1028	}
847	}	1029	}
848		1030
849	void	1031	void
850	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
851	{	1033	{
852	last_activity = NOW;	1034	last_activity = ev_now ();
853		1035
854	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1036	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1037	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1038
		1039	if (connectmode == conf_node::C_DISABLED)
		1040	return;
856		1041
857	switch (pkt->typ ())	1042	switch (pkt->typ ())
858	{	1043	{
859	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
860	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
861	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
862	// when we receive a ping.	1049	// when we receive a ping.
863	if (!ictx)	1050	if (!ictx)
864	{	1051	{
865	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
866	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
867	}	1054	}
868	else	1055	else
		1056	// we would love to change the socket address here, but ping's aren't
		1057	// authenticated, so we best ignore it.
869	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
870		1059
871	break;	1060	break;
872		1061
873	case vpn_packet::PT_PONG:	1062	case vpn_packet::PT_PONG:
		1063	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1064
		1065	// a PONG might mean that the other side doesn't really know
		1066	// about our desire for communication.
		1067	establish_connection ();
874	break;	1068	break;
875		1069
876	case vpn_packet::PT_RESET:	1070	case vpn_packet::PT_RESET:
877	{	1071	{
878	reset_connection ();	1072	reset_connection ();
879		1073
880	config_packet p = (config_packet ) pkt;	1074	config_packet p = (config_packet ) pkt;
881		1075
882	if (!p->chk_config ())	1076	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
883	{
884	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
885	conf->nodename, (const char *)rsi);
886	connectmode = conf_node::C_DISABLED;
887	}
888	else if (connectmode == conf_node::C_ALWAYS)
889	establish_connection ();	1077	establish_connection ();
890	}	1078	}
891	break;	1079	break;
892		1080
893	case vpn_packet::PT_AUTH_REQ:	1081	case vpn_packet::PT_AUTH_REQ:
894	if (auth_rate_limiter.can (rsi))	1082	if (auth_rate_limiter.can (rsi))
895	{	1083	{
896	auth_req_packet p = (auth_req_packet ) pkt;	1084	auth_req_packet p = (auth_req_packet )pkt;
897		1085
898	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1086	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1087	conf->nodename, p->initiate ? "initiate" : "reply",
		1088	p->protocols, p->features);
899		1089
900	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1090	if (memcmp (p->magic, MAGIC, 8))
		1091	{
		1092	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1093	conf->nodename, (const char *)rsi);
		1094	}
		1095	else if (p->chk_config (conf, rsi))
901	{	1096	{
902	if (p->prot_minor != PROTOCOL_MINOR)	1097	if (p->prot_minor != PROTOCOL_MINOR)
903	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1098	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
904	conf->nodename, (const char *)rsi,	1099	conf->nodename, (const char *)rsi,
905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1100	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
906		1101
907	if (p->initiate)	1102	if (p->initiate)
908	send_auth_request (rsi, false);	1103	send_auth_request (rsi, false);
909		1104
910	rsachallenge k;	1105	auth_data auth;
911		1106
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	1107	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
913	(unsigned char )&p->encr, (unsigned char )&k,	1108	{
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1109	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916	conf->nodename, (const char *)rsi);	1110	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1111	}
917	else	1112	else
918	{	1113	{
919	delete octx;	1114	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
920		1115
921	octx = new crypto_ctx (k, 1);	1116	rcv_auth = auth;
922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1117	have_rcv_auth = true;
923		1118
		1119	send_auth_response (rsi);
		1120
		1121	if (chg)
		1122	{
924	conf->protocols = p->protocols;	1123	conf->protocols = p->protocols;
		1124	features = p->features & config_packet::get_features ();
925		1125
926	send_auth_response (rsi, p->id, k);
927
928	connection_established ();	1126	connection_established (rsi);
929
930	break;	1127	}
931	}	1128	}
		1129
		1130	break;
932	}	1131	}
933	else
934	slog (L_WARN, _("%s(%s): protocol mismatch"),
935	conf->nodename, (const char *)rsi);
936		1132
937	send_reset (rsi);	1133	send_reset (rsi);
938	}	1134	}
939		1135
940	break;	1136	break;
941		1137
942	case vpn_packet::PT_AUTH_RES:	1138	case vpn_packet::PT_AUTH_RES:
943	{	1139	{
944	auth_res_packet p = (auth_res_packet ) pkt;	1140	auth_res_packet p = (auth_res_packet )pkt;
945		1141
946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1142	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
947		1143
948	if (p->chk_config ())	1144	auth_mac local_mac;
		1145	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1146
		1147	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
949	{	1148	{
950	if (p->prot_minor != PROTOCOL_MINOR)
951	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
952	conf->nodename, (const char *)rsi,
953	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
954
955	rsachallenge chg;
956
957	if (!rsa_cache.find (p->id, chg))
958	{
959	slog (L_ERR, _("%s(%s): unrequested auth response"),	1149	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
960	conf->nodename, (const char *)rsi);	1150	conf->nodename, (const char *)rsi);
961	break;
962	}	1151	}
963	else	1152	else if (!have_snd_auth)
964	{	1153	{
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1154	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
966		1155
967	if (!p->hmac_chk (cctx))	1156	have_snd_auth = true;
968	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
969	"could be an attack, or just corruption or an synchronization error"),
970	conf->nodename, (const char *)rsi);
971	else
972	{
973	rsaresponse h;
974
975	rsa_hash (p->id, chg, h);
976
977	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
978	{
979	prot_minor = p->prot_minor;
980
981	delete ictx; ictx = cctx;
982
983	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984
985	si = rsi;
986	protocol = rsi.prot;
987
988	connection_established ();	1157	connection_established (rsi);
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}
1006	}	1158	}
1007	}	1159	}
1008
1009	send_reset (rsi);
1010	break;	1160	break;
1011		1161
1012	case vpn_packet::PT_DATA_COMPRESSED:	1162	case vpn_packet::PT_DATA_COMPRESSED:
1013	#if !ENABLE_COMPRESSION	1163	#if !ENABLE_COMPRESSION
1014	send_reset (rsi);	1164	send_reset (rsi);
…		…
1021	{	1171	{
1022	vpndata_packet p = (vpndata_packet )pkt;	1172	vpndata_packet p = (vpndata_packet )pkt;
1023		1173
1024	if (!p->hmac_chk (ictx))	1174	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1175	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1176	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1177	conf->nodename, (const char *)rsi);
1028	else	1178	else
1029	{	1179	{
1030	u32 seqno;	1180	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1181	tap_packet *d = p->unpack (this, seqno);
		1182	int seqclass = iseqno.seqno_classify (seqno);
1032		1183
1033	if (iseqno.recv_ok (seqno))	1184	if (seqclass == 0) // ok
1034	{	1185	{
1035	vpn->tap->send (d);	1186	vpn->tap->send (d);
1036		1187
1037	if (p->dst () == 0) // re-broadcast
1038	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1039	{
1040	connection c = i;
1041
1042	if (c->conf != THISNODE && c->conf != conf)
1043	c->inject_data_packet (d);
1044	}
1045
1046	if (si != rsi)	1188	if (si != rsi)
1047	{	1189	{
1048	// fast re-sync on connection changes, useful especially for tcp/ip	1190	// fast re-sync on source address changes, useful especially for tcp/ip
		1191	//if (last_si_change < ev_now () + 5.)
1049	si = rsi;	1192	// {
1050
1051	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1193	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1052	conf->nodename, (const char )si, (const char )rsi);	1194	conf->nodename, (const char )si, (const char )rsi);
		1195
		1196	si = rsi;
		1197
		1198	if (::conf.script_node_change)
		1199	{
		1200	run_script_cb *cb = new run_script_cb;
		1201	cb->set<connection, &connection::script_node_change> (this);
		1202	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1203	}
		1204
		1205	// }
		1206	//else
		1207	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1208	// conf->nodename, (const char )si, (const char )rsi);
1053	}	1209	}
1054
1055	delete d;
1056
1057	break;
1058	}	1210	}
		1211	else if (seqclass == 1) // far history
		1212	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1213	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1214	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1215	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1216	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1217	else if (seqclass == 3) // reset
		1218	{
		1219	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1220	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1221	send_reset (rsi);
		1222	}
		1223
		1224	delete d;
		1225	break;
1059	}	1226	}
1060	}	1227	}
1061		1228
1062	send_reset (rsi);	1229	send_reset (rsi);
1063	break;	1230	break;
1064		1231
1065	case vpn_packet::PT_CONNECT_REQ:	1232	case vpn_packet::PT_CONNECT_REQ:
1066	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1233	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1067	{	1234	{
1068	connect_req_packet p = (connect_req_packet ) pkt;	1235	connect_req_packet p = (connect_req_packet )pkt;
1069		1236
1070	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1237	if (p->id > 0 && p->id <= vpn->conns.size ())
1071	connection *c = vpn->conns[p->id - 1];
1072	conf->protocols = p->protocols;
1073
1074	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1075	conf->id, p->id, c->ictx && c->octx);
1076
1077	if (c->ictx && c->octx)
1078	{	1238	{
		1239	connection *c = vpn->conns[p->id - 1];
		1240	conf->protocols = p->protocols;
		1241
		1242	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1243	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1244	p->protocols,
		1245	c->ictx && c->octx);
		1246
		1247	if (c->ictx && c->octx)
		1248	{
1079	// send connect_info packets to both sides, in case one is	1249	// send connect_info packets to both sides, in case one is
1080	// behind a nat firewall (or both ;)	1250	// behind a nat firewall (or both ;)
1081	c->send_connect_info (conf->id, si, conf->protocols);	1251	c->send_connect_info (conf->id, si, conf->protocols);
1082	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1252	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1253	}
		1254	else
		1255	c->establish_connection ();
1083	}	1256	}
1084	else	1257	else
1085	c->establish_connection ();	1258	slog (L_WARN,
		1259	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1260	p->id);
1086	}	1261	}
1087		1262
1088	break;	1263	break;
1089		1264
1090	case vpn_packet::PT_CONNECT_INFO:	1265	case vpn_packet::PT_CONNECT_INFO:
1091	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1266	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1092	{	1267	{
1093	connect_info_packet p = (connect_info_packet ) pkt;	1268	connect_info_packet p = (connect_info_packet )pkt;
1094		1269
1095	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1270	if (p->id > 0 && p->id <= vpn->conns.size ())
1096		1271	{
1097	connection *c = vpn->conns[p->id - 1];	1272	connection *c = vpn->conns[p->id - 1];
1098		1273
1099	c->conf->protocols = p->protocols;	1274	c->conf->protocols = p->protocols;
1100	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1275	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1101	p->si.upgrade_protocol (protocol, c->conf);	1276	p->si.upgrade_protocol (protocol, c->conf);
1102		1277
1103	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1278	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1104	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1279	conf->nodename,
		1280	vpn->conns[p->id - 1]->conf->nodename,
		1281	(const char *)p->si,
		1282	p->protocols,
		1283	protocol,
		1284	p->si.supported_protocols (c->conf),
		1285	!c->ictx && !c->octx);
1105		1286
1106	const sockinfo &dsi = forward_si (p->si);	1287	const sockinfo &dsi = forward_si (p->si);
1107		1288
1108	if (dsi.valid ())	1289	if (dsi.valid ())
1109	c->send_auth_request (dsi, true);	1290	c->send_auth_request (dsi, true);
		1291	else
		1292	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1293	vpn->conns[p->id - 1]->conf->nodename,
		1294	(const char *)p->si);
		1295	}
		1296	else
		1297	slog (L_WARN,
		1298	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1299	p->id);
1110	}	1300	}
1111		1301
1112	break;	1302	break;
1113		1303
1114	default:	1304	default:
1115	send_reset (rsi);	1305	send_reset (rsi);
1116	break;	1306	break;
1117	}	1307	}
1118	}	1308	}
1119		1309
1120	void connection::keepalive_cb (time_watcher &w)	1310	inline void
		1311	connection::keepalive_cb (ev::timer &w, int revents)
1121	{	1312	{
1122	if (NOW >= last_activity + ::conf.keepalive + 30)	1313	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1314
		1315	if (when >= 0)
		1316	w.start (when);
		1317	else if (when < -15)
1123	{	1318	{
1124	reset_connection ();	1319	reset_connection ();
1125	establish_connection ();	1320	establish_connection ();
1126	}	1321	}
1127	else if (NOW < last_activity + ::conf.keepalive)
1128	w.at = last_activity + ::conf.keepalive;
1129	else if (conf->connectmode != conf_node::C_ONDEMAND	1322	else if (conf->connectmode != conf_node::C_ONDEMAND
1130	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1323	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1131	{	1324	{
		1325	w.start (3);
1132	send_ping (si);	1326	send_ping (si);
1133	w.at = NOW + 5;
1134	}	1327	}
1135	else if (NOW < last_activity + ::conf.keepalive + 10)	1328	else if (when >= -10)
1136	// hold ondemand connections implicitly a few seconds longer	1329	// hold ondemand connections implicitly a few seconds longer
1137	// should delete octx, though, or something like that ;)	1330	// should delete octx, though, or something like that ;)
1138	w.at = last_activity + ::conf.keepalive + 10;	1331	w.start (when + 10);
1139	else	1332	else
1140	reset_connection ();	1333	reset_connection ();
1141	}	1334	}
1142		1335
		1336	void
1143	void connection::send_connect_request (int id)	1337	connection::send_connect_request (int id)
1144	{	1338	{
1145	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1339	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1146		1340
1147	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1341	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1342	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1343	THISNODE->protocols);
1148	p->hmac_set (octx);	1344	p->hmac_set (octx);
1149	send_vpn_packet (p, si);	1345	send_vpn_packet (p, si);
1150		1346
1151	delete p;	1347	delete p;
1152	}	1348	}
1153		1349
1154	void connection::script_node ()	1350	void
		1351	connection::script_init_env (const char *ext)
1155	{	1352	{
1156	vpn->script_if_up ();
1157
1158	char *env;	1353	char *env;
		1354	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1355	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1356	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1357	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1358	conf->id & 0xff); putenv (env);
		1359	}
		1360
		1361	void
		1362	connection::script_init_connect_env ()
		1363	{
		1364	vpn->script_init_env ();
		1365
		1366	char *env;
1159	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1367	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1368	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1160	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1369	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1161	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1370	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1162	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1371	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1163	}	1372	}
1164		1373
		1374	inline const char *
1165	const char *connection::script_node_up ()	1375	connection::script_node_up ()
1166	{	1376	{
1167	script_node ();	1377	script_init_connect_env ();
1168		1378
1169	putenv ("STATE=up");	1379	putenv ((char *)"STATE=up");
1170		1380
		1381	char *filename;
		1382	asprintf (&filename,
		1383	"%s/%s",
		1384	confbase,
1171	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1385	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1172	}
1173		1386
		1387	return filename;
		1388	}
		1389
		1390	inline const char *
		1391	connection::script_node_change ()
		1392	{
		1393	script_init_connect_env ();
		1394
		1395	putenv ((char *)"STATE=change");
		1396
		1397	char *filename;
		1398	asprintf (&filename,
		1399	"%s/%s",
		1400	confbase,
		1401	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1402
		1403	return filename;
		1404	}
		1405
		1406	inline const char *
1174	const char *connection::script_node_down ()	1407	connection::script_node_down ()
1175	{	1408	{
1176	script_node ();	1409	script_init_connect_env ();
1177		1410
1178	putenv ("STATE=down");	1411	putenv ((char *)"STATE=down");
1179		1412
1180	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1413	char *filename;
1181	}	1414	asprintf (&filename,
		1415	"%s/%s",
		1416	confbase,
		1417	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1182		1418
		1419	return filename;
		1420	}
		1421
1183	connection::connection(struct vpn *vpn_)	1422	connection::connection (struct vpn vpn, conf_node conf)
1184	: vpn(vpn_)	1423	: vpn(vpn), conf(conf),
1185	, rekey (this, &connection::rekey_cb)	1424	#if ENABLE_DNS
1186	, keepalive (this, &connection::keepalive_cb)	1425	dns (0),
		1426	#endif
		1427	data_queue(conf->max_ttl, conf->max_queue + 1),
		1428	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1429	{
		1430	rekey .set<connection, &connection::rekey_cb > (this);
		1431	keepalive .set<connection, &connection::keepalive_cb > (this);
1187	, establish_connection (this, &connection::establish_connection_cb)	1432	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1188	{	1433
		1434	last_establish_attempt = 0.;
1189	octx = ictx = 0;	1435	octx = ictx = 0;
1190	retry_cnt = 0;
1191		1436
1192	connectmode = conf_node::C_ALWAYS; // initial setting	1437	connectmode = conf->connectmode;
		1438
		1439	// queue a dummy packet to force an initial connection attempt
		1440	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1441	vpn_queue.put (new net_packet);
		1442
1193	reset_connection ();	1443	reset_connection ();
1194	}	1444	}
1195		1445
1196	connection::~connection ()	1446	connection::~connection ()
1197	{	1447	{
1198	shutdown ();	1448	shutdown ();
1199	}	1449	}
1200		1450
		1451	void
1201	void connection_init ()	1452	connection_init ()
1202	{	1453	{
1203	auth_rate_limiter.clear ();	1454	auth_rate_limiter.clear ();
1204	reset_rate_limiter.clear ();	1455	reset_rate_limiter.clear ();
1205	}	1456	}
1206		1457

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Comparing gvpe/src/connection.C (file contents): Revision 1.15 by pcg, Fri Aug 8 10:58:28 2003 UTC vs. Revision 1.107 by root, Fri Sep 20 11:57:03 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.15 by pcg, Fri Aug 8 10:58:28 2003 UTC vs.
Revision 1.107 by root, Fri Sep 20 11:57:03 2013 UTC