[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 1.104 by root, Fri Jul 19 18:18:27 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
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb cb, const char warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		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	HMAC_CTX_cleanup (&hctx);
67	}	153	}
68		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
73		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	189	}
81		190
82	struct rsa_entry {	191	void
83	tstamp expire;	192	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	193	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		199
132	} rsa_cache;	200	// eventual response data
133		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	202	}
140	w.at = NOW + RSA_TTL;
141		203
142	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
143	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	206	}
149		207
150	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
151		209
152	void pkt_queue::put (net_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
153	{	212	{
154	if (queue[i])	213	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		214
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	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;	215	i = 0;
182	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	219	}
184		220
185	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
186	{	222	{
187	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
188	delete queue[i];	226	delete [] queue;
189	}	227	}
190		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
191	struct net_rateinfo {	285	struct net_rateinfo
		286	{
192	u32 host;	287	u32 host;
193	double pcnt, diff;	288	double pcnt, diff;
194	tstamp last;	289	tstamp last;
195	};	290	};
196		291
197	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	294	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
201	{	296	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		301
207	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	303	bool can (u32 host);
209	};	304	};
210		305
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		307
		308	bool
213	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
214	{	310	{
215	iterator i;	311	iterator i;
216		312
217	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
218	if (i->host == host)	314	if (i->host == host)
219	break;	315	break;
220	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	317	i = erase (i);
222	else	318	else
223	i++;	319	i++;
224		320
225	if (i == end ())	321	if (i == end ())
226	{	322	{
227	net_rateinfo ri;	323	net_rateinfo ri;
228		324
229	ri.host = host;	325	ri.host = host;
230	ri.pcnt = 1.;	326	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	327	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	328	ri.last = ev_now ();
233		329
234	push_front (ri);	330	push_front (ri);
235		331
236	return true;	332	return true;
237	}	333	}
238	else	334	else
239	{	335	{
240	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
241	erase (i);	337	erase (i);
242		338
243	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		341
246	ri.last = NOW;	342	ri.last = ev_now ();
247		343
248	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
249		345
250	bool send = dif > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
251		347
252	if (dif > MAXDIF)	348	if (dif > NRL_MAXDIF)
253	{	349	{
254	ri.pcnt = 1.;	350	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	351	ri.diff = NRL_MAXDIF;
256	}	352	}
257	else if (send)	353	else if (send)
258	ri.pcnt++;	354	ri.pcnt++;
259		355
260	push_front (ri);	356	push_front (ri);
263	}	359	}
264	}	360	}
265		361
266	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
267		363
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
269
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
271	{	366	{
272	unsigned int xlen;
273
274	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
275		368
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
278	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
280	}	372	}
281		373
282	void	374	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	376	{
285	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		378	hmac_gen (ctx, hmac_digest);
287	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
288	}	380	}
289		381
290	bool	382	bool
291	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
292	{	384	{
293	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
294		386	hmac_gen (ctx, hmac_digest);
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	388	}
297		389
		390	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	392	{
300	type = type_;	393	type = type_;
301		394
302	int src = THISNODE->id;	395	int src = THISNODE->id;
303		396
…		…
307	}	400	}
308		401
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		404
312	struct vpndata_packet:vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		410	tap_packet unpack (connection conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
313	{	414	{
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;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	416	}
		417	};
325		418
326	void	419	void
327	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
328	{	421	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	423	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
332		425
333	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
335	u32 cl;
336		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
338	if (cl)	433	if (cl)
339	{	434	{
340	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
341	d = cdata;	436	d = cdata;
342	l = cl + 2;	437	l = cl + 2;
343		438
344	d[0] = cl >> 8;	439	d[0] = cl >> 8;
345	d[1] = cl;	440	d[1] = cl;
		441	}
346	}	442	}
347	#endif	443	#endif
348		444
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		446
351	struct {	447	struct {
352	#if RAND_SIZE	448	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
354	#endif	450	#endif
355	u32 seqno;	451	u32 seqno;
356	} datahdr;	452	} datahdr;
357		453
358	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	455	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
361	#endif	459	#endif
362		460
363	EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	463	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	464	outl += outl2;
367		465
368	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	468	(unsigned char *) d, l));
371	outl += outl2;	469	outl += outl2;
372		470
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	471	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	472	outl += outl2;
375		473
376	len = outl + data_hdr_size ();	474	len = outl + data_hdr_size ();
377		475
378	set_hdr (type, dst);	476	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	485	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
389	u8 *d;	487	u8 *d;
390	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
391		489
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		491
394	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
396		494
397	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	496	d = cdata;
399	else	497	else
400	#endif	498	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
402		500
403	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 )(&p->len + 1) == &(p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	509	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	510	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	511	outl += outl2;
408		512
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	514	outl += outl2;
411		515
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	516	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		517
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	543	}
440	};	544	};
441		545
442	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
443	{	547	{
444	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
450		552
451	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
452	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f \|= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f \|= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f \|= FEATURE_BRIDGING;
		567	#endif
453	return 0x80	568	return f;
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	569	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	570	};
460		571
		572	void
461	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
462	{	574	{
463	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	578	flags = 0;
467	flags = curflags ();	579	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
473		586
474	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	588	set_hdr (type, dst);
476	}	589	}
477		590
478	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	593	{
480	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
481	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
482	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
483	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
484	else if (hmaclen != HMACLENGTH)	599	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)))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
491	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
492	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	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)))	603	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));	604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
496	else	609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
497	return true;	617	return true;
		618	}
498		619
499	return false;	620	return false;
500	}	621	}
501		622
502	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
503	{	624	{
504	char magic[8];	625	char magic[8];
505	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
506	u8 protocols; // supported protocols (will get patches on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
507	u8 pad2, pad3;	628	u8 pad2, pad3;
508	rsaid id;	629	auth_encr encr;
509	rsaencrdata encr;
510		630
511	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
512	{	632	{
513	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
514	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
515	initiate = !!initiate_;	635	initiate = !!initiate_;
516	protocols = protocols_;	636	protocols = protocols_;
517		637
518	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
519	}	639	}
520	};	640	};
521		641
522	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
523	{	643	{
524	rsaid id;
525	u8 pad1, pad2, pad3;
526	u8 response_len; // encrypted length
527	rsaresponse response;	644	auth_response response;
528		645
529	auth_res_packet (int dst)	646	auth_res_packet (int dst)
530	{	647	{
531	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
532		649
533	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
534	}	651	}
535	};	652	};
536		653
…		…
566	};	683	};
567		684
568	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
569		686
570	void	687	void
571	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
572	{	689	{
		690	if (!have_snd_auth \|\| !have_rcv_auth)
		691	return;
		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
573	if (ictx && octx)	723	if (ictx && octx)
574	{	724	{
575	connectmode = conf->connectmode;	725	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	{	726	{
583	while (tap_packet p = (tap_packet )data_queue.get ())
584	{
585	send_data_packet (p);	727	if (p->len) send_data_packet (p);
586	delete p;	728	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	}	729	}
		730
		731	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
595	}	736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
		742	connection::reset_si ()
		743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
596	else	746	else
597	{	747	{
598	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
599	establish_connection.start (NOW + 5);	749	protocol = 0;
600	keepalive.reset ();
601	rekey.reset ();
602	}	750	}
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		751
614	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
615	}	755	}
616		756
617	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
618	const sockinfo &	758	const sockinfo &
619	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
620	{	760	{
621	if (!si.valid ())	761	if (!si.valid ())
622	{	762	{
623	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
624		764
625	if (r)	765	if (r)
626	{	766	{
627	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
628	conf->nodename, r->conf->nodename);	768	conf->nodename, r->conf->nodename);
629	return r->si;	769	return r->si;
630	}	770	}
631	else	771	else
632	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
633	conf->nodename);	773	conf->nodename);
634	}	774	}
635		775
636	return si;	776	return si;
637	}	777	}
…		…
647	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
648	{	788	{
649	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
650		790
651	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
652	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
653		795
654	delete pkt;	796	delete pkt;
655	}	797	}
656		798
…		…
671	void	813	void
672	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
673	{	815	{
674	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
675		817
676	rsachallenge chg;	818	generate_auth_data ();
		819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
677		820
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);	821	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	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
688		823
689	delete pkt;	824	delete pkt;
690	}	825	}
691		826
692	void	827	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
694	{	829	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		831
697	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
698		834
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);	835	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	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
706		837
707	delete pkt;	838	delete pkt;
708	}	839	}
709		840
710	void	841	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	843	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
715		847
716	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717		849
718	r->hmac_set (octx);	850	r->hmac_set (octx);
719	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
720		852
721	delete r;	853	delete r;
722	}	854	}
723		855
724	void	856	inline void
725	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	858	{
727	if (ictx \|\| conf == THISNODE	859	if (!(ictx && octx)
		860	&& conf != THISNODE
728	\|\| connectmode == conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
729	\|\| connectmode == conf_node::C_DISABLED)	862	&& connectmode != conf_node::C_DISABLED
730	w.at = TSTAMP_CANCEL;	863	&& !w.is_active ())
731	else if (w.at <= NOW)
732	{	864	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		866	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
736	retry_cnt++;	870	return;
		871	}
737		872
738	w.at = NOW + retry_int;	873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		876	? (retry_cnt & 3) + 1
		877	: 1 << (retry_cnt >> 2));
739		878
740	reset_si ();	879	reset_si ();
741		880
742	if (si.prot && !si.host)	881	bool slow = si.prot & PROT_SLOW;
		882
		883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/TODO/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
743	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
744	else	889	else
745	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
746	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow \|\| (dsi.prot & PROT_SLOW);
747		898
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	900	{
750	if (retry_cnt < 4)	901	if (retry_cnt < 4)
751	send_auth_request (dsi, true);	902	send_auth_request (dsi, true);
752	else	903	else
753	send_ping (dsi, 0);	904	send_ping (dsi, 0);
754	}	905	}
755	}	906	}
		907
		908	retry_int *= slow ? 8. : 0.9;
		909
		910	if (retry_int < conf->max_retry)
		911	retry_cnt++;
		912	else
		913	retry_int = conf->max_retry;
		914
		915	w.start (retry_int);
756	}	916	}
757	}	917	}
758		918
759	void	919	void
760	connection::reset_connection ()	920	connection::reset_connection ()
…		…
763	{	923	{
764	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
765	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
766		926
767	if (::conf.script_node_down)	927	if (::conf.script_node_down)
768	run_script (run_script_cb (this, &connection::script_node_down), false);	928	{
		929	run_script_cb *cb = new run_script_cb;
		930	cb->set<connection, &connection::script_node_down> (this);
		931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
769	}	933	}
770		934
771	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
772	delete octx; octx = 0;	936	delete octx; octx = 0;
773		937
774	si.host= 0;	938	si.host = 0;
775		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
776	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
777	retry_cnt = 0;	946	retry_cnt = 0;
778		947
779	rekey.reset ();	948	rekey.stop ();
780	keepalive.reset ();	949	keepalive.stop ();
781	establish_connection.reset ();	950	establish_connection.stop ();
782	}	951	}
783		952
784	void	953	void
785	connection::shutdown ()	954	connection::shutdown ()
786	{	955	{
…		…
788	send_reset (si);	957	send_reset (si);
789		958
790	reset_connection ();	959	reset_connection ();
791	}	960	}
792		961
793	void	962	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
795	{	965	{
796	w.at = TSTAMP_CANCEL;
797
798	reset_connection ();	966	reset_connection ();
799	establish_connection ();	967	establish_connection ();
800	}	968	}
801		969
802	void	970	void
803	connection::send_data_packet (tap_packet *pkt, bool broadcast)	971	connection::send_data_packet (tap_packet *pkt)
804	{	972	{
805	vpndata_packet *p = new vpndata_packet;	973	vpndata_packet *p = new vpndata_packet;
806	int tos = 0;	974	int tos = 0;
807		975
808	// I am not hilarious about peeking into packets, but so be it.	976	// I am not hilarious about peeking into packets, but so be it.
809	if (conf->inherit_tos	977	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;	978	tos = (*pkt)[15] & IPTOS_TOS_MASK;
813		979
814	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	980	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815	send_vpn_packet (p, si, tos);	981	send_vpn_packet (p, si, tos);
816		982
817	delete p;	983	delete p;
818		984
819	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
820	rekey ();	986	rekey ();
821	}	987	}
822		988
823	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
824	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1000	connection::inject_data_packet (tap_packet *pkt)
825	{	1001	{
826	if (ictx && octx)	1002	if (ictx && octx)
827	send_data_packet (pkt, broadcast);	1003	send_data_packet (pkt);
828	else	1004	else
829	{	1005	{
830	if (!broadcast)//DDDD
831	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
832		1007	post_inject_queue ();
833	establish_connection ();
834	}	1008	}
835	}	1009	}
836		1010
		1011	void
837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
838	{	1013	{
839	if (ictx && octx)	1014	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
841	else	1016	else
842	{	1017	{
843	vpn_queue.put (new vpn_packet (*pkt));	1018	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
844		1019	post_inject_queue ();
845	establish_connection ();
846	}	1020	}
847	}	1021	}
848		1022
849	void	1023	void
850	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
851	{	1025	{
852	last_activity = NOW;	1026	last_activity = ev_now ();
853		1027
854	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1030
		1031	if (connectmode == conf_node::C_DISABLED)
		1032	return;
856		1033
857	switch (pkt->typ ())	1034	switch (pkt->typ ())
858	{	1035	{
859	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
860	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
861	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
862	// when we receive a ping.	1041	// when we receive a ping.
863	if (!ictx)	1042	if (!ictx)
864	{	1043	{
865	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
866	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
867	}	1046	}
868	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
869	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
870		1051
871	break;	1052	break;
872		1053
873	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
874	break;	1060	break;
875		1061
876	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
877	{	1063	{
878	reset_connection ();	1064	reset_connection ();
879		1065
880	config_packet p = (config_packet ) pkt;	1066	config_packet p = (config_packet ) pkt;
881		1067
882	if (!p->chk_config ())	1068	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 ();	1069	establish_connection ();
890	}	1070	}
891	break;	1071	break;
892		1072
893	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
894	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
895	{	1075	{
896	auth_req_packet p = (auth_req_packet ) pkt;	1076	auth_req_packet p = (auth_req_packet )pkt;
897		1077
898	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
899		1081
900	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
901	{	1088	{
902	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
903	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
904	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
906		1093
907	if (p->initiate)	1094	if (p->initiate)
908	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
909		1096
910	rsachallenge k;	1097	auth_data auth;
911		1098
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
913	(unsigned char )&p->encr, (unsigned char )&k,	1100	{
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916	conf->nodename, (const char *)rsi);	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1103	}
917	else	1104	else
918	{	1105	{
919	delete octx;	1106	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
920		1107
921	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
923		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
924	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
		1116	features = p->features & config_packet::get_features ();
925		1117
926	send_auth_response (rsi, p->id, k);
927
928	connection_established ();	1118	connection_established (rsi);
929
930	break;	1119	}
931	}	1120	}
		1121
		1122	break;
932	}	1123	}
933	else
934	slog (L_WARN, _("%s(%s): protocol mismatch"),
935	conf->nodename, (const char *)rsi);
936		1124
937	send_reset (rsi);	1125	send_reset (rsi);
938	}	1126	}
939		1127
940	break;	1128	break;
941		1129
942	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
943	{	1131	{
944	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
945		1133
946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
947		1135
948	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
949	{	1140	{
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"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
960	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
961	break;
962	}
963	else
964	{
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);
966
967	if (!p->hmac_chk (cctx))
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 ();
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	}	1143	}
		1144	else if (!have_snd_auth)
		1145	{
		1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1147
		1148	have_snd_auth = true;
		1149	connection_established (rsi);
		1150	}
		1151
		1152	break;
1007	}	1153	}
1008		1154
1009	send_reset (rsi);	1155	send_reset (rsi);
1010	break;	1156	break;
1011		1157
…		…
1021	{	1167	{
1022	vpndata_packet p = (vpndata_packet )pkt;	1168	vpndata_packet p = (vpndata_packet )pkt;
1023		1169
1024	if (!p->hmac_chk (ictx))	1170	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1171	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1172	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1173	conf->nodename, (const char *)rsi);
1028	else	1174	else
1029	{	1175	{
1030	u32 seqno;	1176	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
1032		1179
1033	if (iseqno.recv_ok (seqno))	1180	if (seqclass == 0) // ok
1034	{	1181	{
1035	vpn->tap->send (d);	1182	vpn->tap->send (d);
1036		1183
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)	1184	if (si != rsi)
1047	{	1185	{
1048	// fast re-sync on connection changes, useful especially for tcp/ip	1186	// fast re-sync on source address changes, useful especially for tcp/ip
		1187	//if (last_si_change < ev_now () + 5.)
1049	si = rsi;	1188	// {
1050
1051	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1052	conf->nodename, (const char )si, (const char )rsi);	1190	conf->nodename, (const char )si, (const char )rsi);
		1191
		1192	si = rsi;
		1193
		1194	if (::conf.script_node_change)
		1195	{
		1196	run_script_cb *cb = new run_script_cb;
		1197	cb->set<connection, &connection::script_node_change> (this);
		1198	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1199	}
		1200
		1201	// }
		1202	//else
		1203	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1204	// conf->nodename, (const char )si, (const char )rsi);
1053	}	1205	}
1054
1055	delete d;
1056
1057	break;
1058	}	1206	}
		1207	else if (seqclass == 1) // far history
		1208	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1209	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1210	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1211	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 3) // reset
		1214	{
		1215	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1216	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1217	send_reset (rsi);
		1218	}
		1219
		1220	delete d;
		1221	break;
1059	}	1222	}
1060	}	1223	}
1061		1224
1062	send_reset (rsi);	1225	send_reset (rsi);
1063	break;	1226	break;
1064		1227
1065	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
1066	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1067	{	1230	{
1068	connect_req_packet p = (connect_req_packet ) pkt;	1231	connect_req_packet p = (connect_req_packet )pkt;
1069		1232
1070	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1233	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	{	1234	{
		1235	connection *c = vpn->conns[p->id - 1];
		1236	conf->protocols = p->protocols;
		1237
		1238	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1239	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1240	p->protocols,
		1241	c->ictx && c->octx);
		1242
		1243	if (c->ictx && c->octx)
		1244	{
1079	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
1080	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
1081	c->send_connect_info (conf->id, si, conf->protocols);	1247	c->send_connect_info (conf->id, si, conf->protocols);
1082	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1248	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1249	}
		1250	else
		1251	c->establish_connection ();
1083	}	1252	}
1084	else	1253	else
1085	c->establish_connection ();	1254	slog (L_WARN,
		1255	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1256	p->id);
1086	}	1257	}
1087		1258
1088	break;	1259	break;
1089		1260
1090	case vpn_packet::PT_CONNECT_INFO:	1261	case vpn_packet::PT_CONNECT_INFO:
1091	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1262	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1092	{	1263	{
1093	connect_info_packet p = (connect_info_packet ) pkt;	1264	connect_info_packet p = (connect_info_packet )pkt;
1094		1265
1095	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1266	if (p->id > 0 && p->id <= vpn->conns.size ())
1096		1267	{
1097	connection *c = vpn->conns[p->id - 1];	1268	connection *c = vpn->conns[p->id - 1];
1098		1269
1099	c->conf->protocols = p->protocols;	1270	c->conf->protocols = p->protocols;
1100	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1271	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1101	p->si.upgrade_protocol (protocol, c->conf);	1272	p->si.upgrade_protocol (protocol, c->conf);
1102		1273
1103	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1274	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);	1275	conf->nodename,
		1276	vpn->conns[p->id - 1]->conf->nodename,
		1277	(const char *)p->si,
		1278	p->protocols,
		1279	protocol,
		1280	p->si.supported_protocols (c->conf),
		1281	!c->ictx && !c->octx);
1105		1282
1106	const sockinfo &dsi = forward_si (p->si);	1283	const sockinfo &dsi = forward_si (p->si);
1107		1284
1108	if (dsi.valid ())	1285	if (dsi.valid ())
1109	c->send_auth_request (dsi, true);	1286	c->send_auth_request (dsi, true);
		1287	else
		1288	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si);
		1291	}
		1292	else
		1293	slog (L_WARN,
		1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1295	p->id);
1110	}	1296	}
1111		1297
1112	break;	1298	break;
1113		1299
1114	default:	1300	default:
1115	send_reset (rsi);	1301	send_reset (rsi);
1116	break;	1302	break;
1117	}	1303	}
1118	}	1304	}
1119		1305
1120	void connection::keepalive_cb (time_watcher &w)	1306	inline void
		1307	connection::keepalive_cb (ev::timer &w, int revents)
1121	{	1308	{
1122	if (NOW >= last_activity + ::conf.keepalive + 30)	1309	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1310
		1311	if (when >= 0)
		1312	w.start (when);
		1313	else if (when < -15)
1123	{	1314	{
1124	reset_connection ();	1315	reset_connection ();
1125	establish_connection ();	1316	establish_connection ();
1126	}	1317	}
1127	else if (NOW < last_activity + ::conf.keepalive)
1128	w.at = last_activity + ::conf.keepalive;
1129	else if (conf->connectmode != conf_node::C_ONDEMAND	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1130	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1131	{	1320	{
		1321	w.start (3);
1132	send_ping (si);	1322	send_ping (si);
1133	w.at = NOW + 5;
1134	}	1323	}
1135	else if (NOW < last_activity + ::conf.keepalive + 10)	1324	else if (when >= -10)
1136	// hold ondemand connections implicitly a few seconds longer	1325	// hold ondemand connections implicitly a few seconds longer
1137	// should delete octx, though, or something like that ;)	1326	// should delete octx, though, or something like that ;)
1138	w.at = last_activity + ::conf.keepalive + 10;	1327	w.start (when + 10);
1139	else	1328	else
1140	reset_connection ();	1329	reset_connection ();
1141	}	1330	}
1142		1331
		1332	void
1143	void connection::send_connect_request (int id)	1333	connection::send_connect_request (int id)
1144	{	1334	{
1145	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1335	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1146		1336
1147	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1337	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1338	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1339	THISNODE->protocols);
1148	p->hmac_set (octx);	1340	p->hmac_set (octx);
1149	send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1150		1342
1151	delete p;	1343	delete p;
1152	}	1344	}
1153		1345
1154	void connection::script_node ()	1346	void
		1347	connection::script_init_env (const char *ext)
1155	{	1348	{
1156	vpn->script_if_up ();
1157
1158	char *env;	1349	char *env;
		1350	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1351	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1352	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1353	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1354	conf->id & 0xff); putenv (env);
		1355	}
		1356
		1357	void
		1358	connection::script_init_connect_env ()
		1359	{
		1360	vpn->script_init_env ();
		1361
		1362	char *env;
1159	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1363	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1364	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1160	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1161	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1162	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1163	}	1368	}
1164		1369
		1370	inline const char *
1165	const char *connection::script_node_up ()	1371	connection::script_node_up ()
1166	{	1372	{
1167	script_node ();	1373	script_init_connect_env ();
1168		1374
1169	putenv ("STATE=up");	1375	putenv ((char *)"STATE=up");
1170		1376
		1377	char *filename;
		1378	asprintf (&filename,
		1379	"%s/%s",
		1380	confbase,
1171	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1381	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1172	}
1173		1382
		1383	return filename;
		1384	}
		1385
		1386	inline const char *
		1387	connection::script_node_change ()
		1388	{
		1389	script_init_connect_env ();
		1390
		1391	putenv ((char *)"STATE=change");
		1392
		1393	char *filename;
		1394	asprintf (&filename,
		1395	"%s/%s",
		1396	confbase,
		1397	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1398
		1399	return filename;
		1400	}
		1401
		1402	inline const char *
1174	const char *connection::script_node_down ()	1403	connection::script_node_down ()
1175	{	1404	{
1176	script_node ();	1405	script_init_connect_env ();
1177		1406
1178	putenv ("STATE=down");	1407	putenv ((char *)"STATE=down");
1179		1408
1180	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1409	char *filename;
1181	}	1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1182		1414
		1415	return filename;
		1416	}
		1417
1183	connection::connection(struct vpn *vpn_)	1418	connection::connection (struct vpn vpn, conf_node conf)
1184	: vpn(vpn_)	1419	: vpn(vpn), conf(conf),
1185	, rekey (this, &connection::rekey_cb)	1420	#if ENABLE_DNS
1186	, keepalive (this, &connection::keepalive_cb)	1421	dns (0),
		1422	#endif
		1423	data_queue(conf->max_ttl, conf->max_queue + 1),
		1424	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1425	{
		1426	rekey .set<connection, &connection::rekey_cb > (this);
		1427	keepalive .set<connection, &connection::keepalive_cb > (this);
1187	, establish_connection (this, &connection::establish_connection_cb)	1428	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1188	{	1429
		1430	last_establish_attempt = 0.;
1189	octx = ictx = 0;	1431	octx = ictx = 0;
1190	retry_cnt = 0;
1191		1432
1192	connectmode = conf_node::C_ALWAYS; // initial setting	1433	connectmode = conf->connectmode;
		1434
		1435	// queue a dummy packet to force an initial connection attempt
		1436	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1437	vpn_queue.put (new net_packet);
		1438
1193	reset_connection ();	1439	reset_connection ();
1194	}	1440	}
1195		1441
1196	connection::~connection ()	1442	connection::~connection ()
1197	{	1443	{
1198	shutdown ();	1444	shutdown ();
1199	}	1445	}
1200		1446
		1447	void
1201	void connection_init ()	1448	connection_init ()
1202	{	1449	{
1203	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1204	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1205	}	1452	}
1206		1453

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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 1.104 by root, Fri Jul 19 18:18:27 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 1.104 by root, Fri Jul 19 18:18:27 2013 UTC