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

Comparing gvpe/src/connection.C (file contents):
Revision 1.19 by pcg, Tue Oct 14 03:22:09 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	#include <sys/socket.h>	50	#include "netcompat.h"
41	#ifdef HAVE_NETINET_IN_H
42	# include <netinet/in.h>
43	#endif
44	#include <arpa/inet.h>
45	#include <net/if.h>
46	#ifdef HAVE_NETINET_IN_SYSTM_H
47	# include <netinet/in_systm.h>
48	#endif
49	#ifdef HAVE_NETINET_IP_H
50	# include <netinet/ip.h>
51	#endif
52		51
53	#ifndef IPTOS_TOS_MASK
54	# define IPTOS_TOS_MASK (IPTOS_LOWDELAY \| IPTOS_THROUGHPUT \| IPTOS_RELIABILITY \| IPTOS_MINCOST)
55	#endif
56
57	#if !HAVE_RAND_PSEUDO_BYTES
58	# define RAND_pseudo_bytes RAND_bytes
59	#endif
60
61	#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	//////////////////////////////////////////////////////////////////////////////
62		104
63	struct crypto_ctx	105	struct crypto_ctx
64	{	106	{
65	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
66	HMAC_CTX hctx;	108	HMAC_CTX hctx;
67		109
68	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);
69	~crypto_ctx ();	111	~crypto_ctx ();
70	};	112	};
71		113
72	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)
73	{	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
74	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
75	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
76	HMAC_CTX_init (&hctx);	146	}
77	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
78	}	147	}
79		148
80	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
81	{	150	{
82	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
83	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
84	}	153	}
85		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
86	static void	182	static void
87	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
88	{	184	{
89	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
90		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
91	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
92	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info
93	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
94	EVP_DigestUpdate(&ctx, &id, sizeof id);
95	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
96	EVP_MD_CTX_cleanup (&ctx);
97	}	189	}
98		190
99	struct rsa_entry {	191	void
100	tstamp expire;	192	connection::generate_auth_data ()
101	rsaid id;
102	rsachallenge chg;
103	};
104
105	struct rsa_cache : list<rsa_entry>
106	{	193	{
107	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
108
109	bool find (const rsaid &id, rsachallenge &chg)
110	{
111	for (iterator i = begin (); i != end (); ++i)
112	{
113	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
114	{
115	memcpy (&chg, &i->chg, sizeof chg);
116
117	erase (i);
118	return true;
119	}
120	}
121
122	if (cleaner.at < NOW)
123	cleaner.start (NOW + RSA_TTL);
124
125	return false;
126	}
127
128	void gen (rsaid &id, rsachallenge &chg)
129	{
130	rsa_entry e;
131
132	RAND_bytes ((unsigned char *)&id, sizeof id);
133	RAND_bytes ((unsigned char *)&chg, sizeof chg);
134
135	e.expire = NOW + RSA_TTL;
136	e.id = id;
137	memcpy (&e.chg, &chg, sizeof chg);
138
139	push_back (e);
140
141	if (cleaner.at < NOW)
142	cleaner.start (NOW + RSA_TTL);
143	}
144
145	rsa_cache ()
146	: cleaner (this, &rsa_cache::cleaner_cb)
147	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
148		199
149	} rsa_cache;	200	// eventual response data
150		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
151	void rsa_cache::cleaner_cb (time_watcher &w)
152	{
153	if (empty ())
154	w.at = TSTAMP_CANCEL;
155	else
156	{	202	}
157	w.at = NOW + RSA_TTL;
158		203
159	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
160	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
161	i = erase (i);
162	else
163	++i;
164	}
165	}	206	}
166		207
167	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
168		209
169	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)
170	{	212	{
171	if (queue[i])	213	queue = new pkt [max_queue];
172	{
173	delete queue[i];
174	j = (j + 1) % QUEUEDEPTH;
175	}
176		214
177	queue[i] = p;
178
179	i = (i + 1) % QUEUEDEPTH;
180	}
181
182	net_packet *pkt_queue::get ()
183	{
184	net_packet *p = queue[j];
185
186	if (p)
187	{
188	queue[j] = 0;
189	j = (j + 1) % QUEUEDEPTH;
190	}
191
192	return p;
193	}
194
195	pkt_queue::pkt_queue ()
196	{
197	memset (queue, 0, sizeof (queue));
198	i = 0;	215	i = 0;
199	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
200	}	219	}
201		220
202	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
203	{	222	{
204	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
205	delete queue[i];	226	delete [] queue;
206	}	227	}
207		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
208	struct net_rateinfo {	285	struct net_rateinfo
		286	{
209	u32 host;	287	u32 host;
210	double pcnt, diff;	288	double pcnt, diff;
211	tstamp last;	289	tstamp last;
212	};	290	};
213		291
214	// 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.
215	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
216	// but low on resources.	294	// but low on resources.
217	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
218	{	296	{
219	static const double ALPHA = 1. - 1. / 600.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
220	static const double CUTOFF = 10.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
221	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
222	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
223		301
224	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
225	bool can (u32 host);	303	bool can (u32 host);
226	};	304	};
227		305
228	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
229		307
		308	bool
230	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
231	{	310	{
232	iterator i;	311	iterator i;
233		312
234	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
235	if (i->host == host)	314	if (i->host == host)
236	break;	315	break;
237	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
238	i = erase (i);	317	i = erase (i);
239	else	318	else
240	i++;	319	i++;
241		320
242	if (i == end ())	321	if (i == end ())
243	{	322	{
244	net_rateinfo ri;	323	net_rateinfo ri;
245		324
246	ri.host = host;	325	ri.host = host;
247	ri.pcnt = 1.;	326	ri.pcnt = 1.;
248	ri.diff = MAXDIF;	327	ri.diff = NRL_MAXDIF;
249	ri.last = NOW;	328	ri.last = ev_now ();
250		329
251	push_front (ri);	330	push_front (ri);
252		331
253	return true;	332	return true;
254	}	333	}
255	else	334	else
256	{	335	{
257	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
258	erase (i);	337	erase (i);
259		338
260	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
261	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
262		341
263	ri.last = NOW;	342	ri.last = ev_now ();
264		343
265	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
266		345
267	bool send = dif > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
268		347
269	if (dif > MAXDIF)	348	if (dif > NRL_MAXDIF)
270	{	349	{
271	ri.pcnt = 1.;	350	ri.pcnt = 1.;
272	ri.diff = MAXDIF;	351	ri.diff = NRL_MAXDIF;
273	}	352	}
274	else if (send)	353	else if (send)
275	ri.pcnt++;	354	ri.pcnt++;
276		355
277	push_front (ri);	356	push_front (ri);
280	}	359	}
281	}	360	}
282		361
283	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
284		363
285	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
286
287	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
288	{	366	{
289	unsigned int xlen;
290
291	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
292		368
293	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
294	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
295	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
296	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
297	}	372	}
298		373
299	void	374	void
300	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
301	{	376	{
302	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
303		378	hmac_gen (ctx, hmac_digest);
304	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
305	}	380	}
306		381
307	bool	382	bool
308	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
309	{	384	{
310	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
311		386	hmac_gen (ctx, hmac_digest);
312	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
313	}	388	}
314		389
		390	void
315	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
316	{	392	{
317	type = type_;	393	type = type_;
318		394
319	int src = THISNODE->id;	395	int src = THISNODE->id;
320		396
…		…
324	}	400	}
325		401
326	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
327	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
328		404
329	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
330	{	414	{
331	u8 data[MAXVPNDATA + DATAHDR]; // seqno
332
333	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
334	tap_packet unpack (connection conn, u32 &seqno);
335	private:
336
337	const u32 data_hdr_size () const
338	{
339	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
340	}
341	};	416	}
		417	};
342		418
343	void	419	void
344	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)
345	{	421	{
346	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
347	int outl = 0, outl2;	423	int outl = 0, outl2;
348	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
349		425
350	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
351	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
352	u32 cl;
353		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
354	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
355	if (cl)	433	if (cl)
356	{	434	{
357	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
358	d = cdata;	436	d = cdata;
359	l = cl + 2;	437	l = cl + 2;
360		438
361	d[0] = cl >> 8;	439	d[0] = cl >> 8;
362	d[1] = cl;	440	d[1] = cl;
		441	}
363	}	442	}
364	#endif	443	#endif
365		444
366	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
367		446
368	struct {	447	struct {
369	#if RAND_SIZE	448	#if RAND_SIZE
370	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
371	#endif	450	#endif
372	u32 seqno;	451	u32 seqno;
373	} datahdr;	452	} datahdr;
374		453
375	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
376	#if RAND_SIZE	455	#if RAND_SIZE
377	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);
378	#endif	459	#endif
379		460
380	EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
381	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
382	(unsigned char *) &datahdr, DATAHDR);	463	(unsigned char *) &datahdr, DATAHDR));
383	outl += outl2;	464	outl += outl2;
384		465
385	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
386	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
387	(unsigned char *) d, l);	468	(unsigned char *) d, l));
388	outl += outl2;	469	outl += outl2;
389		470
390	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	471	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
391	outl += outl2;	472	outl += outl2;
392		473
393	len = outl + data_hdr_size ();	474	len = outl + data_hdr_size ();
394		475
395	set_hdr (type, dst);	476	set_hdr (type, dst);
…		…
404	int outl = 0, outl2;	485	int outl = 0, outl2;
405	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
406	u8 *d;	487	u8 *d;
407	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
408		489
409	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
410		491
411	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
412	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
413		494
414	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
415	d = cdata;	496	d = cdata;
416	else	497	else
417	#endif	498	#endif
418	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
419		500
420	/* 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
421	EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
422	d, &outl2,	509	d, &outl2,
423	(unsigned char *)&data, len - data_hdr_size ());	510	(unsigned char *)&data, len - data_hdr_size ()));
424	outl += outl2;	511	outl += outl2;
425		512
426	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
427	outl += outl2;	514	outl += outl2;
428		515
429	seqno = ntohl ((u32 )(d + RAND_SIZE));	516	seqno = ntohl ((u32 )(d + RAND_SIZE));
430		517
431	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
456	}	543	}
457	};	544	};
458		545
459	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
460	{	547	{
461	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
462	// field comes before this data, so peers with other
463	// hmacs simply will not work.
464	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
465	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
466	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
467		552
468	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 ()
469	{	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
470	return 0x80	568	return f;
471	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
472	}	569	}
473
474	void setup (ptype type, int dst);
475	bool chk_config () const;
476	};	570	};
477		571
		572	void
478	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
479	{	574	{
480	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
481	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
482	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
483	hmaclen = HMACLENGTH;	578	flags = 0;
484	flags = curflags ();	579	features = get_features ();
485	challengelen = sizeof (rsachallenge);
486		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	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 ()));
490		586
491	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	588	set_hdr (type, dst);
493	}	589	}
494		590
495	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
496	{	593	{
497	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
498	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);
499	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
500	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
501	else if (hmaclen != HMACLENGTH)	599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
502	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
503	else if (flags != curflags ())
504	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	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)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
510	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	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 ()));
513	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)
514	return true;	617	return true;
		618	}
515		619
516	return false;	620	return false;
517	}	621	}
518		622
519	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
520	{	624	{
521	char magic[8];	625	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will get patches on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	628	u8 pad2, pad3;
525	rsaid id;	629	auth_encr encr;
526	rsaencrdata encr;
527		630
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	632	{
530	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	635	initiate = !!initiate_;
533	protocols = protocols_;	636	protocols = protocols_;
534		637
535	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
536	}	639	}
537	};	640	};
538		641
539	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	643	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	644	auth_response response;
545		645
546	auth_res_packet (int dst)	646	auth_res_packet (int dst)
547	{	647	{
548	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
549		649
550	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
551	}	651	}
552	};	652	};
553		653
…		…
583	};	683	};
584		684
585	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
586		686
587	void	687	void
588	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
589	{	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
590	if (ictx && octx)	723	if (ictx && octx)
591	{	724	{
592	connectmode = conf->connectmode;	725	while (tap_packet p = (tap_packet )data_queue.get ())
593
594	rekey.start (NOW + ::conf.rekey);
595	keepalive.start (NOW + ::conf.keepalive);
596
597	// send queued packets
598	if (ictx && octx)
599	{	726	{
600	while (tap_packet p = (tap_packet )data_queue.get ())
601	{
602	send_data_packet (p);	727	if (p->len) send_data_packet (p);
603	delete p;	728	delete p;
604	}
605
606	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
607	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;
610	}
611	}	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	}
612	}	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 ());
613	else	746	else
614	{	747	{
615	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
616	establish_connection.start (NOW + 5);	749	protocol = 0;
617	keepalive.reset ();
618	rekey.reset ();
619	}	750	}
620	}
621
622	void
623	connection::reset_si ()
624	{
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);
626
627	// mask out protocols we cannot establish
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
630		751
631	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
632	}	755	}
633		756
634	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
635	const sockinfo &	758	const sockinfo &
636	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
637	{	760	{
638	if (!si.valid ())	761	if (!si.valid ())
639	{	762	{
640	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
641		764
642	if (r)	765	if (r)
643	{	766	{
644	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
645	conf->nodename, r->conf->nodename);	768	conf->nodename, r->conf->nodename);
646	return r->si;	769	return r->si;
647	}	770	}
648	else	771	else
649	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
650	conf->nodename);	773	conf->nodename);
651	}	774	}
652		775
653	return si;	776	return si;
654	}	777	}
…		…
664	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
665	{	788	{
666	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
667		790
668	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);
669	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
670		795
671	delete pkt;	796	delete pkt;
672	}	797	}
673		798
…		…
688	void	813	void
689	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
690	{	815	{
691	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);
692		817
693	rsachallenge chg;	818	generate_auth_data ();
		819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
694		820
695	rsa_cache.gen (pkt->id, chg);
696
697	if (0 > RSA_public_encrypt (sizeof chg,
698	(unsigned char )&chg, (unsigned char )&pkt->encr,
699	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
700	fatal ("RSA_public_encrypt error");
701
702	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);
703
704	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
705		823
706	delete pkt;	824	delete pkt;
707	}	825	}
708		826
709	void	827	void
710	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
711	{	829	{
712	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
713		831
714	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);
715		834
716	rsa_hash (id, chg, pkt->response);
717
718	pkt->hmac_set (octx);
719
720	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);
721
722	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
723		837
724	delete pkt;	838	delete pkt;
725	}	839	}
726		840
727	void	841	void
728	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
729	{	843	{
730	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
731	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
732		847
733	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);
734		849
735	r->hmac_set (octx);	850	r->hmac_set (octx);
736	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
737		852
738	delete r;	853	delete r;
739	}	854	}
740		855
741	void	856	inline void
742	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
743	{	858	{
744	if (ictx \|\| conf == THISNODE	859	if (!(ictx && octx)
		860	&& conf != THISNODE
745	\|\| connectmode == conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
746	\|\| connectmode == conf_node::C_DISABLED)	862	&& connectmode != conf_node::C_DISABLED
747	w.at = TSTAMP_CANCEL;	863	&& !w.is_active ())
748	else if (w.at <= NOW)
749	{	864	{
750	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
751		866	// and stop trying. should probably be handled by a per-connection expire handler.
752	if (retry_int < 3600 * 8)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
753	retry_cnt++;	870	return;
		871	}
754		872
755	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));
756		878
757	reset_si ();	879	reset_si ();
758		880
759	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);
760	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
761	else	889	else
762	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
763	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow \|\| (dsi.prot & PROT_SLOW);
764		898
765	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
766	{	900	{
767	if (retry_cnt < 4)	901	if (retry_cnt < 4)
768	send_auth_request (dsi, true);	902	send_auth_request (dsi, true);
769	else	903	else
770	send_ping (dsi, 0);	904	send_ping (dsi, 0);
771	}	905	}
772	}	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);
773	}	916	}
774	}	917	}
775		918
776	void	919	void
777	connection::reset_connection ()	920	connection::reset_connection ()
…		…
780	{	923	{
781	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
782	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
783		926
784	if (::conf.script_node_down)	927	if (::conf.script_node_down)
785	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	}
786	}	933	}
787		934
788	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
789	delete octx; octx = 0;	936	delete octx; octx = 0;
790		937
791	si.host= 0;	938	si.host = 0;
792		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
793	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
794	retry_cnt = 0;	946	retry_cnt = 0;
795		947
796	rekey.reset ();	948	rekey.stop ();
797	keepalive.reset ();	949	keepalive.stop ();
798	establish_connection.reset ();	950	establish_connection.stop ();
799	}	951	}
800		952
801	void	953	void
802	connection::shutdown ()	954	connection::shutdown ()
803	{	955	{
…		…
805	send_reset (si);	957	send_reset (si);
806		958
807	reset_connection ();	959	reset_connection ();
808	}	960	}
809		961
810	void	962	// poor-man's rekeying
811	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
812	{	965	{
813	w.at = TSTAMP_CANCEL;
814
815	reset_connection ();	966	reset_connection ();
816	establish_connection ();	967	establish_connection ();
817	}	968	}
818		969
819	void	970	void
820	connection::send_data_packet (tap_packet *pkt, bool broadcast)	971	connection::send_data_packet (tap_packet *pkt)
821	{	972	{
822	vpndata_packet *p = new vpndata_packet;	973	vpndata_packet *p = new vpndata_packet;
823	int tos = 0;	974	int tos = 0;
824		975
825	// 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.
826	if (conf->inherit_tos	977	if (conf->inherit_tos && pkt->is_ipv4 ())
827	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
828	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
829	tos = (*pkt)[15] & IPTOS_TOS_MASK;	978	tos = (*pkt)[15] & IPTOS_TOS_MASK;
830		979
831	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
832	send_vpn_packet (p, si, tos);	981	send_vpn_packet (p, si, tos);
833		982
834	delete p;	983	delete p;
835		984
836	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
837	rekey ();	986	rekey ();
838	}	987	}
839		988
840	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
841	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1000	connection::inject_data_packet (tap_packet *pkt)
842	{	1001	{
843	if (ictx && octx)	1002	if (ictx && octx)
844	send_data_packet (pkt, broadcast);	1003	send_data_packet (pkt);
845	else	1004	else
846	{	1005	{
847	if (!broadcast)//DDDD
848	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
849		1007	post_inject_queue ();
850	establish_connection ();
851	}	1008	}
852	}	1009	}
853		1010
		1011	void
854	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
855	{	1013	{
856	if (ictx && octx)	1014	if (ictx && octx)
857	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
858	else	1016	else
859	{	1017	{
860	vpn_queue.put (new vpn_packet (*pkt));	1018	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
861		1019	post_inject_queue ();
862	establish_connection ();
863	}	1020	}
864	}	1021	}
865		1022
866	void	1023	void
867	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
868	{	1025	{
869	last_activity = NOW;	1026	last_activity = ev_now ();
870		1027
871	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.",
872	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;
873		1033
874	switch (pkt->typ ())	1034	switch (pkt->typ ())
875	{	1035	{
876	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
877	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
878	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
879	// when we receive a ping.	1041	// when we receive a ping.
880	if (!ictx)	1042	if (!ictx)
881	{	1043	{
882	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
883	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
884	}	1046	}
885	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.
886	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
887		1051
888	break;	1052	break;
889		1053
890	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 ();
891	break;	1060	break;
892		1061
893	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
894	{	1063	{
895	reset_connection ();	1064	reset_connection ();
896		1065
897	config_packet p = (config_packet ) pkt;	1066	config_packet p = (config_packet ) pkt;
898		1067
899	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
900	{
901	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
902	conf->nodename, (const char *)rsi);
903	connectmode = conf_node::C_DISABLED;
904	}
905	else if (connectmode == conf_node::C_ALWAYS)
906	establish_connection ();	1069	establish_connection ();
907	}	1070	}
908	break;	1071	break;
909		1072
910	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
911	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
912	{	1075	{
913	auth_req_packet p = (auth_req_packet ) pkt;	1076	auth_req_packet p = (auth_req_packet )pkt;
914		1077
915	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);
916		1081
917	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))
918	{	1088	{
919	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
920	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."),
921	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
922	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
923		1093
924	if (p->initiate)	1094	if (p->initiate)
925	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
926		1096
927	rsachallenge k;	1097	auth_data auth;
928		1098
929	if (0 > RSA_private_decrypt (sizeof (p->encr),	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
930	(unsigned char )&p->encr, (unsigned char )&k,	1100	{
931	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
932	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
933	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1103	}
934	else	1104	else
935	{	1105	{
936	delete octx;	1106	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
937		1107
938	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
939	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
940		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
941	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
		1116	features = p->features & config_packet::get_features ();
942		1117
943	send_auth_response (rsi, p->id, k);
944
945	connection_established ();	1118	connection_established (rsi);
946
947	break;	1119	}
948	}	1120	}
		1121
		1122	break;
949	}	1123	}
950	else
951	slog (L_WARN, _("%s(%s): protocol mismatch"),
952	conf->nodename, (const char *)rsi);
953		1124
954	send_reset (rsi);	1125	send_reset (rsi);
955	}	1126	}
956		1127
957	break;	1128	break;
958		1129
959	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
960	{	1131	{
961	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
962		1133
963	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
964		1135
965	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))
966	{	1140	{
967	if (p->prot_minor != PROTOCOL_MINOR)
968	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
969	conf->nodename, (const char *)rsi,
970	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
971
972	rsachallenge chg;
973
974	if (!rsa_cache.find (p->id, chg))
975	{
976	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
977	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
978	break;
979	}
980	else
981	{
982	crypto_ctx *cctx = new crypto_ctx (chg, 0);
983
984	if (!p->hmac_chk (cctx))
985	{
986	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
987	"could be an attack, or just corruption or an synchronization error"),
988	conf->nodename, (const char *)rsi);
989	break;
990	}
991	else
992	{
993	rsaresponse h;
994
995	rsa_hash (p->id, chg, h);
996
997	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
998	{
999	prot_minor = p->prot_minor;
1000
1001	delete ictx; ictx = cctx;
1002
1003	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1004
1005	si = rsi;
1006	protocol = rsi.prot;
1007
1008	connection_established ();
1009
1010	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1011	conf->nodename, (const char *)rsi,
1012	p->prot_major, p->prot_minor);
1013
1014	if (::conf.script_node_up)
1015	run_script (run_script_cb (this, &connection::script_node_up), false);
1016
1017	break;
1018	}
1019	else
1020	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1021	conf->nodename, (const char *)rsi);
1022	}
1023
1024	delete cctx;
1025	}
1026	}	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;
1027	}	1153	}
1028		1154
1029	send_reset (rsi);	1155	send_reset (rsi);
1030	break;	1156	break;
1031		1157
…		…
1041	{	1167	{
1042	vpndata_packet p = (vpndata_packet )pkt;	1168	vpndata_packet p = (vpndata_packet )pkt;
1043		1169
1044	if (!p->hmac_chk (ictx))	1170	if (!p->hmac_chk (ictx))
1045	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"
1046	"could be an attack, or just corruption or an synchronization error"),	1172	"could be an attack, or just corruption or a synchronization error."),
1047	conf->nodename, (const char *)rsi);	1173	conf->nodename, (const char *)rsi);
1048	else	1174	else
1049	{	1175	{
1050	u32 seqno;	1176	u32 seqno;
1051	tap_packet *d = p->unpack (this, seqno);	1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
1052		1179
1053	if (iseqno.recv_ok (seqno))	1180	if (seqclass == 0) // ok
1054	{	1181	{
1055	vpn->tap->send (d);	1182	vpn->tap->send (d);
1056		1183
1057	if (p->dst () == 0) // re-broadcast
1058	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1059	{
1060	connection c = i;
1061
1062	if (c->conf != THISNODE && c->conf != conf)
1063	c->inject_data_packet (d);
1064	}
1065
1066	if (si != rsi)	1184	if (si != rsi)
1067	{	1185	{
1068	// 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.)
1069	si = rsi;	1188	// {
1070
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1072	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);
1073	}	1205	}
1074
1075	delete d;
1076
1077	break;
1078	}	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;
1079	}	1222	}
1080	}	1223	}
1081		1224
1082	send_reset (rsi);	1225	send_reset (rsi);
1083	break;	1226	break;
1084		1227
1085	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
1086	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1087	{	1230	{
1088	connect_req_packet p = (connect_req_packet ) pkt;	1231	connect_req_packet p = (connect_req_packet )pkt;
1089		1232
1090	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 ())
1091	connection *c = vpn->conns[p->id - 1];
1092	conf->protocols = p->protocols;
1093
1094	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1095	conf->id, p->id, c->ictx && c->octx);
1096
1097	if (c->ictx && c->octx)
1098	{	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	{
1099	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
1100	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
1101	c->send_connect_info (conf->id, si, conf->protocols);	1247	c->send_connect_info (conf->id, si, conf->protocols);
1102	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 ();
1103	}	1252	}
1104	else	1253	else
1105	c->establish_connection ();	1254	slog (L_WARN,
		1255	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1256	p->id);
1106	}	1257	}
1107		1258
1108	break;	1259	break;
1109		1260
1110	case vpn_packet::PT_CONNECT_INFO:	1261	case vpn_packet::PT_CONNECT_INFO:
1111	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1262	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1112	{	1263	{
1113	connect_info_packet p = (connect_info_packet ) pkt;	1264	connect_info_packet p = (connect_info_packet )pkt;
1114		1265
1115	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 ())
1116		1267	{
1117	connection *c = vpn->conns[p->id - 1];	1268	connection *c = vpn->conns[p->id - 1];
1118		1269
1119	c->conf->protocols = p->protocols;	1270	c->conf->protocols = p->protocols;
1120	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));
1121	p->si.upgrade_protocol (protocol, c->conf);	1272	p->si.upgrade_protocol (protocol, c->conf);
1122		1273
1123	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]",
1124	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);
1125		1282
1126	const sockinfo &dsi = forward_si (p->si);	1283	const sockinfo &dsi = forward_si (p->si);
1127		1284
1128	if (dsi.valid ())	1285	if (dsi.valid ())
1129	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);
1130	}	1296	}
1131		1297
1132	break;	1298	break;
1133		1299
1134	default:	1300	default:
1135	send_reset (rsi);	1301	send_reset (rsi);
1136	break;	1302	break;
1137	}	1303	}
1138	}	1304	}
1139		1305
1140	void connection::keepalive_cb (time_watcher &w)	1306	inline void
		1307	connection::keepalive_cb (ev::timer &w, int revents)
1141	{	1308	{
1142	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)
1143	{	1314	{
1144	reset_connection ();	1315	reset_connection ();
1145	establish_connection ();	1316	establish_connection ();
1146	}	1317	}
1147	else if (NOW < last_activity + ::conf.keepalive)
1148	w.at = last_activity + ::conf.keepalive;
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1320	{
		1321	w.start (3);
1152	send_ping (si);	1322	send_ping (si);
1153	w.at = NOW + 5;
1154	}	1323	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1324	else if (when >= -10)
1156	// hold ondemand connections implicitly a few seconds longer	1325	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1326	// should delete octx, though, or something like that ;)
1158	w.at = last_activity + ::conf.keepalive + 10;	1327	w.start (when + 10);
1159	else	1328	else
1160	reset_connection ();	1329	reset_connection ();
1161	}	1330	}
1162		1331
		1332	void
1163	void connection::send_connect_request (int id)	1333	connection::send_connect_request (int id)
1164	{	1334	{
1165	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);
1166		1336
1167	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);
1168	p->hmac_set (octx);	1340	p->hmac_set (octx);
1169	send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1170		1342
1171	delete p;	1343	delete p;
1172	}	1344	}
1173		1345
1174	void connection::script_node ()	1346	void
		1347	connection::script_init_env (const char *ext)
1175	{	1348	{
1176	vpn->script_if_up ();
1177
1178	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;
1179	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);
1180	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1181	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1182	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1183	}	1368	}
1184		1369
		1370	inline const char *
1185	const char *connection::script_node_up ()	1371	connection::script_node_up ()
1186	{	1372	{
1187	script_node ();	1373	script_init_connect_env ();
1188		1374
1189	putenv ("STATE=up");	1375	putenv ((char *)"STATE=up");
1190		1376
		1377	char *filename;
		1378	asprintf (&filename,
		1379	"%s/%s",
		1380	confbase,
1191	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1381	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1192	}
1193		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 *
1194	const char *connection::script_node_down ()	1403	connection::script_node_down ()
1195	{	1404	{
1196	script_node ();	1405	script_init_connect_env ();
1197		1406
1198	putenv ("STATE=down");	1407	putenv ((char *)"STATE=down");
1199		1408
1200	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1409	char *filename;
1201	}	1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1202		1414
		1415	return filename;
		1416	}
		1417
1203	connection::connection(struct vpn *vpn_)	1418	connection::connection (struct vpn vpn, conf_node conf)
1204	: vpn(vpn_)	1419	: vpn(vpn), conf(conf),
1205	, rekey (this, &connection::rekey_cb)	1420	#if ENABLE_DNS
1206	, 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);
1207	, establish_connection (this, &connection::establish_connection_cb)	1428	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1208	{	1429
		1430	last_establish_attempt = 0.;
1209	octx = ictx = 0;	1431	octx = ictx = 0;
1210	retry_cnt = 0;
1211		1432
1212	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
1213	reset_connection ();	1439	reset_connection ();
1214	}	1440	}
1215		1441
1216	connection::~connection ()	1442	connection::~connection ()
1217	{	1443	{
1218	shutdown ();	1444	shutdown ();
1219	}	1445	}
1220		1446
		1447	void
1221	void connection_init ()	1448	connection_init ()
1222	{	1449	{
1223	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1224	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1225	}	1452	}
1226		1453

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Comparing gvpe/src/connection.C (file contents): Revision 1.19 by pcg, Tue Oct 14 03:22:09 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 1.19 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.104 by root, Fri Jul 19 18:18:27 2013 UTC