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

Comparing gvpe/src/connection.C (file contents):
Revision 1.16 by pcg, Mon Sep 1 15:52:03 2003 UTC vs.
Revision 1.101 by root, Wed Jul 17 16:40:57 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 "PORN\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 (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		126	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		127	kdf.extract (s, sizeof (s));
		128	kdf.extract_done (HKDF_PRF_HASH ());
		129	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		130
		131	HMAC_CTX_init (&hctx);
		132	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		133	}
		134
		135	{
		136	u8 cipher_key[CIPHER_KEYSIZE];
		137	static const unsigned char cipher_info[] = "gvpe cipher key";
		138
		139	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		140	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		141	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		142	kdf.extract (s, sizeof (s));
		143	kdf.extract_done (HKDF_PRF_HASH ());
		144	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		145
57	EVP_CIPHER_CTX_init (&cctx);	146	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	147	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	148	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	149	}
62		150
63	crypto_ctx::~crypto_ctx ()	151	crypto_ctx::~crypto_ctx ()
64	{	152	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	153	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	154	HMAC_CTX_cleanup (&hctx);
67	}	155	}
68		156
		157	static inline void
		158	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		159	{
		160	if (RSA_public_encrypt (sizeof (auth.rsa),
		161	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		162	key, RSA_PKCS1_OAEP_PADDING) < 0)
		163	fatal ("RSA_public_encrypt error");
		164
		165	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		166	}
		167
		168	static inline bool
		169	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		170	{
		171	u8 rsa_decrypt[RSA_KEYLEN];
		172
		173	if (RSA_private_decrypt (sizeof (encr.rsa),
		174	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		175	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		176	return 0;
		177
		178	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		179	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		180
		181	return 1;
		182	}
		183
69	static void	184	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	185	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	186	{
72	EVP_MD_CTX ctx;	187	HMAC_CTX ctx;
73		188
74	EVP_MD_CTX_init (&ctx);	189	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	190	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	191	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	192	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	193	HMAC_CTX_cleanup (&ctx);
80	}	194	}
81		195
82	struct rsa_entry {	196	void
83	tstamp expire;	197	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	198	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	199	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	{ }	200	{
		201	// request data
		202	rand_fill (snd_auth.rsa);
		203	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		204	auth_hash (snd_auth, snd_auth_mac);
131		205
132	} rsa_cache;	206	// eventual response data
133		207	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	{	208	}
140	w.at = NOW + RSA_TTL;
141		209
142	for (iterator i = begin (); i != end (); )	210	// every use prolongs the expiry
143	if (i->expire <= NOW)	211	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	212	}
149		213
150	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
151		215
152	void pkt_queue::put (net_packet *p)	216	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		217	: max_ttl (max_ttl), max_queue (max_queue)
153	{	218	{
154	if (queue[i])	219	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		220
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;	221	i = 0;
182	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	225	}
184		226
185	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
186	{	228	{
187	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
188	delete queue[i];	232	delete [] queue;
189	}	233	}
190		234
		235	void
		236	pkt_queue::expire_cb (ev::timer &w, int revents)
		237	{
		238	ev_tstamp expire = ev_now () - max_ttl;
		239
		240	for (;;)
		241	{
		242	if (empty ())
		243	break;
		244
		245	double diff = queue[j].tstamp - expire;
		246
		247	if (diff >= 0.)
		248	{
		249	w.start (diff > 0.5 ? diff : 0.5);
		250	break;
		251	}
		252
		253	delete get ();
		254	}
		255	}
		256
		257	void
		258	pkt_queue::put (net_packet *p)
		259	{
		260	ev_tstamp now = ev_now ();
		261
		262	// start expiry timer
		263	if (empty ())
		264	expire.start (max_ttl);
		265
		266	int ni = i + 1 == max_queue ? 0 : i + 1;
		267
		268	if (ni == j)
		269	delete get ();
		270
		271	queue[i].pkt = p;
		272	queue[i].tstamp = now;
		273
		274	i = ni;
		275	}
		276
		277	net_packet *
		278	pkt_queue::get ()
		279	{
		280	if (empty ())
		281	return 0;
		282
		283	net_packet *p = queue[j].pkt;
		284	queue[j].pkt = 0;
		285
		286	j = j + 1 == max_queue ? 0 : j + 1;
		287
		288	return p;
		289	}
		290
191	struct net_rateinfo {	291	struct net_rateinfo
		292	{
192	u32 host;	293	u32 host;
193	double pcnt, diff;	294	double pcnt, diff;
194	tstamp last;	295	tstamp last;
195	};	296	};
196		297
197	// only do action once every x seconds per host whole allowing bursts.	298	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	299	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	300	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	301	struct net_rate_limiter : list<net_rateinfo>
201	{	302	{
202	static const double ALPHA = 1. - 1. / 600.; // allow bursts	303	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	304	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	305	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	306	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		307
207	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	309	bool can (u32 host);
209	};	310	};
210		311
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		313
		314	bool
213	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
214	{	316	{
215	iterator i;	317	iterator i;
216		318
217	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
218	if (i->host == host)	320	if (i->host == host)
219	break;	321	break;
220	else if (i->last < NOW - EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	323	i = erase (i);
222	else	324	else
223	i++;	325	i++;
224		326
225	if (i == end ())	327	if (i == end ())
226	{	328	{
227	net_rateinfo ri;	329	net_rateinfo ri;
228		330
229	ri.host = host;	331	ri.host = host;
230	ri.pcnt = 1.;	332	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	333	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	334	ri.last = ev_now ();
233		335
234	push_front (ri);	336	push_front (ri);
235		337
236	return true;	338	return true;
237	}	339	}
238	else	340	else
239	{	341	{
240	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
241	erase (i);	343	erase (i);
242		344
243	ri.pcnt = ri.pcnt * ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		347
246	ri.last = NOW;	348	ri.last = ev_now ();
247		349
248	double dif = ri.diff / ri.pcnt;	350	double dif = ri.diff / ri.pcnt;
249		351
250	bool send = dif > CUTOFF;	352	bool send = dif > NRL_CUTOFF;
251		353
252	if (dif > MAXDIF)	354	if (dif > NRL_MAXDIF)
253	{	355	{
254	ri.pcnt = 1.;	356	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	357	ri.diff = NRL_MAXDIF;
256	}	358	}
257	else if (send)	359	else if (send)
258	ri.pcnt++;	360	ri.pcnt++;
259		361
260	push_front (ri);	362	push_front (ri);
265		367
266	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
267		369
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
269		371
		372	void
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
271	{	374	{
272	unsigned int xlen;	375	unsigned int xlen;
273		376
274	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
275		378
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	379	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	380	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
278	len - sizeof (hmac_packet));	381	len - sizeof (hmac_packet)));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	382	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
280	}	383	}
281		384
282	void	385	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	386	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	387	{
…		…
293	hmac_gen (ctx);	396	hmac_gen (ctx);
294		397
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	399	}
297		400
		401	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	403	{
300	type = type_;	404	type = type_;
301		405
302	int src = THISNODE->id;	406	int src = THISNODE->id;
303		407
…		…
307	}	411	}
308		412
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		415
312	struct vpndata_packet:vpn_packet	416	struct vpndata_packet : vpn_packet
		417	{
		418	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		419
		420	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		421	tap_packet unpack (connection conn, u32 &seqno);
		422
		423	private:
		424	const u32 data_hdr_size () const
313	{	425	{
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;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	427	}
		428	};
325		429
326	void	430	void
327	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	431	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
328	{	432	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	434	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
332		436
333	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
335	u32 cl;
336		439
		440	if (conn->features & FEATURE_COMPRESSION)
		441	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		443
338	if (cl)	444	if (cl)
339	{	445	{
340	type = PT_DATA_COMPRESSED;	446	type = PT_DATA_COMPRESSED;
341	d = cdata;	447	d = cdata;
342	l = cl + 2;	448	l = cl + 2;
343		449
344	d[0] = cl >> 8;	450	d[0] = cl >> 8;
345	d[1] = cl;	451	d[1] = cl;
		452	}
346	}	453	}
347	#endif	454	#endif
348		455
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	456	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		457
351	struct {	458	struct {
352	#if RAND_SIZE	459	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	460	u8 rnd[RAND_SIZE];
354	#endif	461	#endif
355	u32 seqno;	462	u32 seqno;
356	} datahdr;	463	} datahdr;
357		464
358	datahdr.seqno = ntohl (seqno);	465	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	466	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	467	require (RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE) >= 0);
361	#endif	468	#endif
362		469
363	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	473	outl += outl2;
367		474
368	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	477	(unsigned char *) d, l));
371	outl += outl2;	478	outl += outl2;
372		479
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	481	outl += outl2;
375		482
376	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
377		484
378	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	494	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
389	u8 *d;	496	u8 *d;
390	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
391		498
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		500
394	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
396		503
397	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	505	d = cdata;
399	else	506	else
400	#endif	507	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
402		509
403	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 )(&p->len + 1) == &(p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	518	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	520	outl += outl2;
408		521
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	523	outl += outl2;
411		524
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	525	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		526
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	552	}
440	};	553	};
441		554
442	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
443	{	556	{
444	// actually, hmaclen cannot be checked because the hmac
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
450
451	const u8 curflags () const
452	{
453	return 0x80
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}
456		560
457	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
458	bool chk_config () const;	562	bool chk_config () const;
		563
		564	static u8 get_features ()
		565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f \|= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f \|= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f \|= FEATURE_BRIDGING;
		575	#endif
		576	return f;
		577	}
459	};	578	};
460		579
		580	void
461	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
462	{	582	{
463	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	586	flags = 0;
467	flags = curflags ();	587	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		588
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	589	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		591	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
473		592
474	len = sizeof (*this) - sizeof (net_packet);	593	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	594	set_hdr (type, dst);
476	}	595	}
477		596
		597	bool
478	bool config_packet::chk_config () const	598	config_packet::chk_config () const
479	{	599	{
480	if (prot_major != PROTOCOL_MAJOR)	600	if (prot_major != PROTOCOL_MAJOR)
481	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	601	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
482	else if (randsize != RAND_SIZE)	602	else if (randsize != RAND_SIZE)
483	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	603	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
484	else if (hmaclen != HMACLENGTH)
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)))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
491	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	605	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
492	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
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)))	606	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));	607	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		608	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		609	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
496	else	610	else
497	return true;	611	return true;
498		612
499	return false;	613	return false;
500	}	614	}
501		615
502	struct auth_req_packet : config_packet	616	struct auth_req_packet : config_packet // UNPROTECTED
503	{	617	{
504	char magic[8];	618	char magic[8];
505	u8 initiate; // false if this is just an automatic reply	619	u8 initiate; // false if this is just an automatic reply
506	u8 protocols; // supported protocols (will get patches on forward)	620	u8 protocols; // supported protocols (will be patched on forward)
507	u8 pad2, pad3;	621	u8 pad2, pad3;
508	rsaid id;	622	auth_encr encr;
509	rsaencrdata encr;
510		623
511	auth_req_packet (int dst, bool initiate_, u8 protocols_)	624	auth_req_packet (int dst, bool initiate_, u8 protocols_)
512	{	625	{
513	config_packet::setup (PT_AUTH_REQ, dst);	626	config_packet::setup (PT_AUTH_REQ, dst);
514	strncpy (magic, MAGIC, 8);	627	memcpy (magic, MAGIC, 8);
515	initiate = !!initiate_;	628	initiate = !!initiate_;
516	protocols = protocols_;	629	protocols = protocols_;
517		630
518	len = sizeof (*this) - sizeof (net_packet);	631	len = sizeof (*this) - sizeof (net_packet);
519	}	632	}
520	};	633	};
521		634
522	struct auth_res_packet : config_packet	635	struct auth_res_packet : config_packet // UNPROTECTED
523	{	636	{
524	rsaid id;
525	u8 pad1, pad2, pad3;
526	u8 response_len; // encrypted length
527	rsaresponse response;	637	auth_response response;
528		638
529	auth_res_packet (int dst)	639	auth_res_packet (int dst)
530	{	640	{
531	config_packet::setup (PT_AUTH_RES, dst);	641	config_packet::setup (PT_AUTH_RES, dst);
532		642
…		…
566	};	676	};
567		677
568	/////////////////////////////////////////////////////////////////////////////	678	/////////////////////////////////////////////////////////////////////////////
569		679
570	void	680	void
571	connection::connection_established ()	681	connection::connection_established (const sockinfo &rsi)
572	{	682	{
		683	if (!have_snd_auth \|\| !have_rcv_auth)
		684	return;
		685
		686	si = rsi;
		687	protocol = rsi.prot;
		688
		689	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		690	conf->nodename, (const char *)rsi,
		691	is_direct ? "direct" : "forwarded",
		692	PROTOCOL_MAJOR, prot_minor);
		693
		694	if (::conf.script_node_up)
		695	{
		696	run_script_cb *cb = new run_script_cb;
		697	cb->set<connection, &connection::script_node_up> (this);
		698	run_script_queued (cb, _("node-up command execution failed, continuing."));
		699	}
		700
		701	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		702	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		703
		704	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		705	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		706
573	if (ictx && octx)	707	if (ictx && octx)
574	{	708	{
575	connectmode = conf->connectmode;	709	// make sure rekeying timeouts are slightly asymmetric
		710	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		711	rekey.start (rekey_interval, rekey_interval);
576		712
577	rekey.start (NOW + ::conf.rekey);
578	keepalive.start (NOW + ::conf.keepalive);	713	keepalive.start (::conf.keepalive);
579		714
580	// send queued packets	715	// send queued packets
581	if (ictx && octx)	716	if (ictx && octx)
582	{	717	{
583	while (tap_packet p = (tap_packet )data_queue.get ())	718	while (tap_packet p = (tap_packet )data_queue.get ())
584	{	719	{
585	send_data_packet (p);	720	if (p->len) send_data_packet (p);
586	delete p;	721	delete p;
587	}	722	}
588		723
589	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	724	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
590	{	725	{
591	send_vpn_packet (p, si, IPTOS_RELIABILITY);	726	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
592	delete p;	727	delete p;
593	}	728	}
594	}	729	}
		730
		731	vpn->connection_established (this);
595	}	732	}
		733	#if 0
596	else	734	else
597	{	735	{
598	retry_cnt = 0;	736	retry_cnt = 0;
599	establish_connection.start (NOW + 5);	737	establish_connection.start (5);
600	keepalive.reset ();	738	keepalive.stop ();
601	rekey.reset ();	739	rekey.stop ();
602	}	740	}
		741	#endif
603	}	742	}
604		743
605	void	744	void
606	connection::reset_si ()	745	connection::reset_si ()
607	{	746	{
		747	if (vpn->can_direct (THISNODE, conf))
608	protocol = best_protocol (THISNODE->protocols & conf->protocols);	748	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
609		749	else
610	// mask out protocols we cannot establish	750	{
611	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	751	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
612	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	752	protocol = 0;
		753	}
613		754
614	si.set (conf, protocol);	755	si.set (conf, protocol);
		756
		757	is_direct = si.valid ();
615	}	758	}
616		759
617	// ensure sockinfo is valid, forward if necessary	760	// ensure sockinfo is valid, forward if necessary
618	const sockinfo &	761	const sockinfo &
619	connection::forward_si (const sockinfo &si) const	762	connection::forward_si (const sockinfo &si) const
620	{	763	{
621	if (!si.valid ())	764	if (!si.valid ())
622	{	765	{
623	connection *r = vpn->find_router ();	766	connection *r = vpn->find_router_for (this);
624		767
625	if (r)	768	if (r)
626	{	769	{
627	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	770	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
628	conf->nodename, r->conf->nodename);	771	conf->nodename, r->conf->nodename);
629	return r->si;	772	return r->si;
630	}	773	}
631	else	774	else
632	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	775	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
633	conf->nodename);	776	conf->nodename);
634	}	777	}
635		778
636	return si;	779	return si;
637	}	780	}
…		…
647	connection::send_ping (const sockinfo &si, u8 pong)	790	connection::send_ping (const sockinfo &si, u8 pong)
648	{	791	{
649	ping_packet *pkt = new ping_packet;	792	ping_packet *pkt = new ping_packet;
650		793
651	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	794	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		795
		796	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
652	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	797	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
653		798
654	delete pkt;	799	delete pkt;
655	}	800	}
656		801
…		…
671	void	816	void
672	connection::send_auth_request (const sockinfo &si, bool initiate)	817	connection::send_auth_request (const sockinfo &si, bool initiate)
673	{	818	{
674	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	819	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
675		820
676	rsachallenge chg;	821	generate_auth_data ();
		822	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
677		823
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);	824	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	825	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
688		826
689	delete pkt;	827	delete pkt;
690	}	828	}
691		829
692	void	830	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	831	connection::send_auth_response (const sockinfo &si)
694	{	832	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	833	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		834
697	pkt->id = id;	835	auth_hash (rcv_auth, pkt->response.mac);
		836	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
698		837
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);	838	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	839	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
706		840
707	delete pkt;	841	delete pkt;
708	}	842	}
709		843
710	void	844	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	845	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	846	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	847	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	848	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		849	conf->protocols);
715		850
716	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	851	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717		852
718	r->hmac_set (octx);	853	r->hmac_set (octx);
719	send_vpn_packet (r, si);	854	send_vpn_packet (r, si);
720		855
721	delete r;	856	delete r;
722	}	857	}
723		858
724	void	859	inline void
725	connection::establish_connection_cb (time_watcher &w)	860	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	861	{
727	if (ictx \|\| conf == THISNODE	862	if (!(ictx && octx)
		863	&& conf != THISNODE
728	\|\| connectmode == conf_node::C_NEVER	864	&& connectmode != conf_node::C_NEVER
729	\|\| connectmode == conf_node::C_DISABLED)	865	&& connectmode != conf_node::C_DISABLED
730	w.at = TSTAMP_CANCEL;	866	&& !w.is_active ())
731	else if (w.at <= NOW)
732	{	867	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	868	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		869	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	870	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		871	{
		872	reset_connection ();
736	retry_cnt++;	873	return;
		874	}
737		875
738	w.at = NOW + retry_int;	876	last_establish_attempt = ev_now ();
		877
		878	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		879	? (retry_cnt & 3) + 1
		880	: 1 << (retry_cnt >> 2));
739		881
740	reset_si ();	882	reset_si ();
741		883
742	if (si.prot && !si.host)	884	bool slow = si.prot & PROT_SLOW;
		885
		886	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		887	{
		888	/TODO/ /* start the timer so we don't recurse endlessly */
		889	w.start (1);
743	vpn->send_connect_request (conf->id);	890	vpn->send_connect_request (this);
		891	}
744	else	892	else
745	{	893	{
		894	if (si.valid ())
		895	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		896	conf->nodename, (const char *)si);
		897
746	const sockinfo &dsi = forward_si (si);	898	const sockinfo &dsi = forward_si (si);
		899
		900	slow = slow \|\| (dsi.prot & PROT_SLOW);
747		901
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	902	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	903	{
750	if (retry_cnt < 4)	904	if (retry_cnt < 4)
751	send_auth_request (dsi, true);	905	send_auth_request (dsi, true);
752	else	906	else
753	send_ping (dsi, 0);	907	send_ping (dsi, 0);
754	}	908	}
755	}	909	}
		910
		911	retry_int *= slow ? 8. : 0.9;
		912
		913	if (retry_int < conf->max_retry)
		914	retry_cnt++;
		915	else
		916	retry_int = conf->max_retry;
		917
		918	w.start (retry_int);
756	}	919	}
757	}	920	}
758		921
759	void	922	void
760	connection::reset_connection ()	923	connection::reset_connection ()
…		…
763	{	926	{
764	slog (L_INFO, _("%s(%s): connection lost"),	927	slog (L_INFO, _("%s(%s): connection lost"),
765	conf->nodename, (const char *)si);	928	conf->nodename, (const char *)si);
766		929
767	if (::conf.script_node_down)	930	if (::conf.script_node_down)
768	run_script (run_script_cb (this, &connection::script_node_down), false);	931	{
		932	run_script_cb *cb = new run_script_cb;
		933	cb->set<connection, &connection::script_node_down> (this);
		934	run_script_queued (cb, _("node-down command execution failed, continuing."));
		935	}
769	}	936	}
770		937
771	delete ictx; ictx = 0;	938	delete ictx; ictx = 0;
772	delete octx; octx = 0;	939	delete octx; octx = 0;
773		940
774	si.host= 0;	941	si.host = 0;
775		942
		943	have_snd_auth = false;
		944	have_rcv_auth = false;
		945	auth_expire = 0.;
		946
776	last_activity = 0;	947	last_activity = 0.;
		948	//last_si_change = 0.;
777	retry_cnt = 0;	949	retry_cnt = 0;
778		950
779	rekey.reset ();	951	rekey.stop ();
780	keepalive.reset ();	952	keepalive.stop ();
781	establish_connection.reset ();	953	establish_connection.stop ();
782	}	954	}
783		955
784	void	956	void
785	connection::shutdown ()	957	connection::shutdown ()
786	{	958	{
…		…
788	send_reset (si);	960	send_reset (si);
789		961
790	reset_connection ();	962	reset_connection ();
791	}	963	}
792		964
793	void	965	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	966	inline void
		967	connection::rekey_cb (ev::timer &w, int revents)
795	{	968	{
796	w.at = TSTAMP_CANCEL;
797
798	reset_connection ();	969	reset_connection ();
799	establish_connection ();	970	establish_connection ();
800	}	971	}
801		972
802	void	973	void
803	connection::send_data_packet (tap_packet *pkt, bool broadcast)	974	connection::send_data_packet (tap_packet *pkt)
804	{	975	{
805	vpndata_packet *p = new vpndata_packet;	976	vpndata_packet *p = new vpndata_packet;
806	int tos = 0;	977	int tos = 0;
807		978
808	// I am not hilarious about peeking into packets, but so be it.	979	// I am not hilarious about peeking into packets, but so be it.
809	if (conf->inherit_tos	980	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;	981	tos = (*pkt)[15] & IPTOS_TOS_MASK;
813		982
814	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	983	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815	send_vpn_packet (p, si, tos);	984	send_vpn_packet (p, si, tos);
816		985
817	delete p;	986	delete p;
818		987
819	if (oseqno > MAX_SEQNO)	988	if (oseqno > MAX_SEQNO)
820	rekey ();	989	rekey ();
821	}	990	}
822		991
823	void	992	void
		993	connection::post_inject_queue ()
		994	{
		995	// force a connection every now and when when packets are sent (max 1/s)
		996	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		997	establish_connection.stop ();
		998
		999	establish_connection ();
		1000	}
		1001
		1002	void
824	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1003	connection::inject_data_packet (tap_packet *pkt)
825	{	1004	{
826	if (ictx && octx)	1005	if (ictx && octx)
827	send_data_packet (pkt, broadcast);	1006	send_data_packet (pkt);
828	else	1007	else
829	{	1008	{
830	if (!broadcast)//DDDD
831	data_queue.put (new tap_packet (*pkt));	1009	data_queue.put (new tap_packet (*pkt));
832		1010	post_inject_queue ();
833	establish_connection ();
834	}	1011	}
835	}	1012	}
836		1013
		1014	void
837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1015	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
838	{	1016	{
839	if (ictx && octx)	1017	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	1018	send_vpn_packet (pkt, si, tos);
841	else	1019	else
842	{	1020	{
843	vpn_queue.put (new vpn_packet (*pkt));	1021	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
844		1022	post_inject_queue ();
845	establish_connection ();
846	}	1023	}
847	}	1024	}
848		1025
849	void	1026	void
850	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1027	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
851	{	1028	{
852	last_activity = NOW;	1029	last_activity = ev_now ();
853		1030
854	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1031	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1032	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1033
		1034	if (connectmode == conf_node::C_DISABLED)
		1035	return;
856		1036
857	switch (pkt->typ ())	1037	switch (pkt->typ ())
858	{	1038	{
859	case vpn_packet::PT_PING:	1039	case vpn_packet::PT_PING:
		1040	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1041
860	// we send pings instead of auth packets after some retries,	1042	// we send pings instead of auth packets after some retries,
861	// so reset the retry counter and establish a connection	1043	// so reset the retry counter and establish a connection
862	// when we receive a ping.	1044	// when we receive a ping.
863	if (!ictx)	1045	if (!ictx)
864	{	1046	{
865	if (auth_rate_limiter.can (rsi))	1047	if (auth_rate_limiter.can (rsi))
866	send_auth_request (rsi, true);	1048	send_auth_request (rsi, true);
867	}	1049	}
868	else	1050	else
		1051	// we would love to change the socket address here, but ping's aren't
		1052	// authenticated, so we best ignore it.
869	send_ping (rsi, 1); // pong	1053	send_ping (rsi, 1); // pong
870		1054
871	break;	1055	break;
872		1056
873	case vpn_packet::PT_PONG:	1057	case vpn_packet::PT_PONG:
		1058	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1059
		1060	// a PONG might mean that the other side doesn't really know
		1061	// about our desire for communication.
		1062	establish_connection ();
874	break;	1063	break;
875		1064
876	case vpn_packet::PT_RESET:	1065	case vpn_packet::PT_RESET:
877	{	1066	{
878	reset_connection ();	1067	reset_connection ();
879		1068
880	config_packet p = (config_packet ) pkt;	1069	config_packet p = (config_packet ) pkt;
881		1070
882	if (!p->chk_config ())	1071	if (!p->chk_config ())
883	{	1072	{
884	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1073	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
885	conf->nodename, (const char *)rsi);	1074	conf->nodename, (const char *)rsi);
886	connectmode = conf_node::C_DISABLED;	1075	connectmode = conf_node::C_DISABLED;
887	}	1076	}
888	else if (connectmode == conf_node::C_ALWAYS)	1077	else if (connectmode == conf_node::C_ALWAYS)
889	establish_connection ();	1078	establish_connection ();
…		…
891	break;	1080	break;
892		1081
893	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
894	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
895	{	1084	{
896	auth_req_packet p = (auth_req_packet ) pkt;	1085	auth_req_packet p = (auth_req_packet )pkt;
897		1086
898	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1087	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1088	conf->nodename, p->initiate ? "initiate" : "reply",
		1089	p->protocols, p->features);
899		1090
900	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
901	{	1092	{
902	if (p->prot_minor != PROTOCOL_MINOR)	1093	if (p->prot_minor != PROTOCOL_MINOR)
903	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1094	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
904	conf->nodename, (const char *)rsi,	1095	conf->nodename, (const char *)rsi,
905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1096	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
906		1097
907	if (p->initiate)	1098	if (p->initiate)
908	send_auth_request (rsi, false);	1099	send_auth_request (rsi, false);
909		1100
910	rsachallenge k;	1101	auth_data auth;
911		1102
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	1103	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
913	(unsigned char )&p->encr, (unsigned char )&k,	1104	{
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1105	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916	conf->nodename, (const char *)rsi);	1106	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1107	}
917	else	1108	else
918	{	1109	{
919	delete octx;	1110	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
920		1111
921	octx = new crypto_ctx (k, 1);	1112	rcv_auth = auth;
922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1113	have_rcv_auth = true;
923		1114
		1115	send_auth_response (rsi);
		1116
		1117	if (chg)
		1118	{
924	conf->protocols = p->protocols;	1119	conf->protocols = p->protocols;
		1120	features = p->features & config_packet::get_features ();
925		1121
926	send_auth_response (rsi, p->id, k);
927
928	connection_established ();	1122	connection_established (rsi);
929
930	break;	1123	}
931	}	1124	}
		1125
		1126	break;
932	}	1127	}
933	else	1128	else
934	slog (L_WARN, _("%s(%s): protocol mismatch"),	1129	slog (L_WARN, _("%s(%s): protocol mismatch."),
935	conf->nodename, (const char *)rsi);	1130	conf->nodename, (const char *)rsi);
936		1131
937	send_reset (rsi);	1132	send_reset (rsi);
938	}	1133	}
939		1134
940	break;	1135	break;
941		1136
942	case vpn_packet::PT_AUTH_RES:	1137	case vpn_packet::PT_AUTH_RES:
943	{	1138	{
944	auth_res_packet p = (auth_res_packet ) pkt;	1139	auth_res_packet p = (auth_res_packet )pkt;
945		1140
946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1141	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
947		1142
948	if (p->chk_config ())	1143	if (p->chk_config ())
949	{	1144	{
950	if (p->prot_minor != PROTOCOL_MINOR)	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
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	{	1146	{
959	slog (L_ERR, _("%s(%s): unrequested auth response"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
960	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
961	break;
962	}	1149	}
963	else	1150	else if (!have_snd_auth)
964	{	1151	{
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1152	if (p->prot_minor != PROTOCOL_MINOR)
966		1153	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
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);	1154	conf->nodename, (const char *)rsi,
971	else	1155	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
972	{
973	rsaresponse h;
974		1156
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;	1157	prot_minor = p->prot_minor;
		1158	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
980		1159
981	delete ictx; ictx = cctx;	1160	have_snd_auth = true;
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 ();	1161	connection_established (rsi);
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}	1162	}
		1163
		1164	break;
1006	}	1165	}
1007	}	1166	}
1008		1167
1009	send_reset (rsi);	1168	send_reset (rsi);
1010	break;	1169	break;
…		…
1021	{	1180	{
1022	vpndata_packet p = (vpndata_packet )pkt;	1181	vpndata_packet p = (vpndata_packet )pkt;
1023		1182
1024	if (!p->hmac_chk (ictx))	1183	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
1028	else	1187	else
1029	{	1188	{
1030	u32 seqno;	1189	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1190	tap_packet *d = p->unpack (this, seqno);
		1191	int seqclass = iseqno.seqno_classify (seqno);
1032		1192
1033	if (iseqno.recv_ok (seqno))	1193	if (seqclass == 0) // ok
1034	{	1194	{
1035	vpn->tap->send (d);	1195	vpn->tap->send (d);
1036		1196
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)	1197	if (si != rsi)
1047	{	1198	{
1048	// fast re-sync on connection changes, useful especially for tcp/ip	1199	// fast re-sync on source address changes, useful especially for tcp/ip
		1200	//if (last_si_change < ev_now () + 5.)
1049	si = rsi;	1201	// {
1050
1051	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1202	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1052	conf->nodename, (const char )si, (const char )rsi);	1203	conf->nodename, (const char )si, (const char )rsi);
		1204
		1205	si = rsi;
		1206
		1207	if (::conf.script_node_change)
		1208	{
		1209	run_script_cb *cb = new run_script_cb;
		1210	cb->set<connection, &connection::script_node_change> (this);
		1211	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1212	}
		1213
		1214	// }
		1215	//else
		1216	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1217	// conf->nodename, (const char )si, (const char )rsi);
1053	}	1218	}
1054
1055	delete d;
1056
1057	break;
1058	}	1219	}
		1220	else if (seqclass == 1) // far history
		1221	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1222	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1223	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1224	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1225	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1226	else if (seqclass == 3) // reset
		1227	{
		1228	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1229	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1230	send_reset (rsi);
		1231	}
		1232
		1233	delete d;
		1234	break;
1059	}	1235	}
1060	}	1236	}
1061		1237
1062	send_reset (rsi);	1238	send_reset (rsi);
1063	break;	1239	break;
1064		1240
1065	case vpn_packet::PT_CONNECT_REQ:	1241	case vpn_packet::PT_CONNECT_REQ:
1066	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1242	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1067	{	1243	{
1068	connect_req_packet p = (connect_req_packet ) pkt;	1244	connect_req_packet p = (connect_req_packet )pkt;
1069		1245
1070	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1246	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	{	1247	{
		1248	connection *c = vpn->conns[p->id - 1];
		1249	conf->protocols = p->protocols;
		1250
		1251	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1252	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1253	p->protocols,
		1254	c->ictx && c->octx);
		1255
		1256	if (c->ictx && c->octx)
		1257	{
1079	// send connect_info packets to both sides, in case one is	1258	// send connect_info packets to both sides, in case one is
1080	// behind a nat firewall (or both ;)	1259	// behind a nat firewall (or both ;)
1081	c->send_connect_info (conf->id, si, conf->protocols);	1260	c->send_connect_info (conf->id, si, conf->protocols);
1082	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1261	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1262	}
		1263	else
		1264	c->establish_connection ();
1083	}	1265	}
1084	else	1266	else
1085	c->establish_connection ();	1267	slog (L_WARN,
		1268	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1269	p->id);
1086	}	1270	}
1087		1271
1088	break;	1272	break;
1089		1273
1090	case vpn_packet::PT_CONNECT_INFO:	1274	case vpn_packet::PT_CONNECT_INFO:
1091	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1275	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1092	{	1276	{
1093	connect_info_packet p = (connect_info_packet ) pkt;	1277	connect_info_packet p = (connect_info_packet )pkt;
1094		1278
1095	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1279	if (p->id > 0 && p->id <= vpn->conns.size ())
1096		1280	{
1097	connection *c = vpn->conns[p->id - 1];	1281	connection *c = vpn->conns[p->id - 1];
1098		1282
1099	c->conf->protocols = p->protocols;	1283	c->conf->protocols = p->protocols;
1100	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1284	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1101	p->si.upgrade_protocol (protocol, c->conf);	1285	p->si.upgrade_protocol (protocol, c->conf);
1102		1286
1103	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1287	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);	1288	conf->nodename,
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si,
		1291	p->protocols,
		1292	protocol,
		1293	p->si.supported_protocols (c->conf),
		1294	!c->ictx && !c->octx);
1105		1295
1106	const sockinfo &dsi = forward_si (p->si);	1296	const sockinfo &dsi = forward_si (p->si);
1107		1297
1108	if (dsi.valid ())	1298	if (dsi.valid ())
1109	c->send_auth_request (dsi, true);	1299	c->send_auth_request (dsi, true);
		1300	else
		1301	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si);
		1304	}
		1305	else
		1306	slog (L_WARN,
		1307	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1308	p->id);
1110	}	1309	}
1111		1310
1112	break;	1311	break;
1113		1312
1114	default:	1313	default:
1115	send_reset (rsi);	1314	send_reset (rsi);
1116	break;	1315	break;
1117	}	1316	}
1118	}	1317	}
1119		1318
1120	void connection::keepalive_cb (time_watcher &w)	1319	inline void
		1320	connection::keepalive_cb (ev::timer &w, int revents)
1121	{	1321	{
1122	if (NOW >= last_activity + ::conf.keepalive + 30)	1322	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1323
		1324	if (when >= 0)
		1325	w.start (when);
		1326	else if (when < -15)
1123	{	1327	{
1124	reset_connection ();	1328	reset_connection ();
1125	establish_connection ();	1329	establish_connection ();
1126	}	1330	}
1127	else if (NOW < last_activity + ::conf.keepalive)
1128	w.at = last_activity + ::conf.keepalive;
1129	else if (conf->connectmode != conf_node::C_ONDEMAND	1331	else if (conf->connectmode != conf_node::C_ONDEMAND
1130	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1332	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1131	{	1333	{
		1334	w.start (3);
1132	send_ping (si);	1335	send_ping (si);
1133	w.at = NOW + 5;
1134	}	1336	}
1135	else if (NOW < last_activity + ::conf.keepalive + 10)	1337	else if (when >= -10)
1136	// hold ondemand connections implicitly a few seconds longer	1338	// hold ondemand connections implicitly a few seconds longer
1137	// should delete octx, though, or something like that ;)	1339	// should delete octx, though, or something like that ;)
1138	w.at = last_activity + ::conf.keepalive + 10;	1340	w.start (when + 10);
1139	else	1341	else
1140	reset_connection ();	1342	reset_connection ();
1141	}	1343	}
1142		1344
		1345	void
1143	void connection::send_connect_request (int id)	1346	connection::send_connect_request (int id)
1144	{	1347	{
1145	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1348	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1146		1349
1147	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1350	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1351	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1352	THISNODE->protocols);
1148	p->hmac_set (octx);	1353	p->hmac_set (octx);
1149	send_vpn_packet (p, si);	1354	send_vpn_packet (p, si);
1150		1355
1151	delete p;	1356	delete p;
1152	}	1357	}
1153		1358
1154	void connection::script_node ()	1359	void
		1360	connection::script_init_env (const char *ext)
1155	{	1361	{
1156	vpn->script_if_up ();
1157
1158	char *env;	1362	char *env;
		1363	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1364	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1365	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1366	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1367	conf->id & 0xff); putenv (env);
		1368	}
		1369
		1370	void
		1371	connection::script_init_connect_env ()
		1372	{
		1373	vpn->script_init_env ();
		1374
		1375	char *env;
1159	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1376	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1377	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1160	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1378	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1161	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1379	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1162	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1380	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1163	}	1381	}
1164		1382
		1383	inline const char *
1165	const char *connection::script_node_up ()	1384	connection::script_node_up ()
1166	{	1385	{
1167	script_node ();	1386	script_init_connect_env ();
1168		1387
1169	putenv ("STATE=up");	1388	putenv ((char *)"STATE=up");
1170		1389
		1390	char *filename;
		1391	asprintf (&filename,
		1392	"%s/%s",
		1393	confbase,
1171	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1394	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1172	}
1173		1395
		1396	return filename;
		1397	}
		1398
		1399	inline const char *
		1400	connection::script_node_change ()
		1401	{
		1402	script_init_connect_env ();
		1403
		1404	putenv ((char *)"STATE=change");
		1405
		1406	char *filename;
		1407	asprintf (&filename,
		1408	"%s/%s",
		1409	confbase,
		1410	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1411
		1412	return filename;
		1413	}
		1414
		1415	inline const char *
1174	const char *connection::script_node_down ()	1416	connection::script_node_down ()
1175	{	1417	{
1176	script_node ();	1418	script_init_connect_env ();
1177		1419
1178	putenv ("STATE=down");	1420	putenv ((char *)"STATE=down");
1179		1421
1180	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1422	char *filename;
1181	}	1423	asprintf (&filename,
		1424	"%s/%s",
		1425	confbase,
		1426	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1182		1427
		1428	return filename;
		1429	}
		1430
1183	connection::connection(struct vpn *vpn_)	1431	connection::connection (struct vpn vpn, conf_node conf)
1184	: vpn(vpn_)	1432	: vpn(vpn), conf(conf),
1185	, rekey (this, &connection::rekey_cb)	1433	#if ENABLE_DNS
1186	, keepalive (this, &connection::keepalive_cb)	1434	dns (0),
		1435	#endif
		1436	data_queue(conf->max_ttl, conf->max_queue + 1),
		1437	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1438	{
		1439	rekey .set<connection, &connection::rekey_cb > (this);
		1440	keepalive .set<connection, &connection::keepalive_cb > (this);
1187	, establish_connection (this, &connection::establish_connection_cb)	1441	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1188	{	1442
		1443	last_establish_attempt = 0.;
1189	octx = ictx = 0;	1444	octx = ictx = 0;
1190	retry_cnt = 0;
1191		1445
1192	connectmode = conf_node::C_ALWAYS; // initial setting	1446	connectmode = conf->connectmode;
		1447
		1448	// queue a dummy packet to force an initial connection attempt
		1449	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1450	vpn_queue.put (new net_packet);
		1451
1193	reset_connection ();	1452	reset_connection ();
1194	}	1453	}
1195		1454
1196	connection::~connection ()	1455	connection::~connection ()
1197	{	1456	{
1198	shutdown ();	1457	shutdown ();
1199	}	1458	}
1200		1459
		1460	void
1201	void connection_init ()	1461	connection_init ()
1202	{	1462	{
1203	auth_rate_limiter.clear ();	1463	auth_rate_limiter.clear ();
1204	reset_rate_limiter.clear ();	1464	reset_rate_limiter.clear ();
1205	}	1465	}
1206		1466

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Comparing gvpe/src/connection.C (file contents): Revision 1.16 by pcg, Mon Sep 1 15:52:03 2003 UTC vs. Revision 1.101 by root, Wed Jul 17 16:40:57 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.16 by pcg, Mon Sep 1 15:52:03 2003 UTC vs.
Revision 1.101 by root, Wed Jul 17 16:40:57 2013 UTC