[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 1.100 by root, Wed Jul 17 05:34:17 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
		54	#define ULTRA_FAST 1
		55	#define HLOG 15
		56	#include "lzf/lzf.h"
		57	#include "lzf/lzf_c.c"
		58	#include "lzf/lzf_d.c"
		59
		60	//////////////////////////////////////////////////////////////////////////////
		61
		62	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		63	static ev::child rs_child_ev;
		64
		65	namespace
		66	{
		67	void // c++ requires external linkage here, apparently :(
		68	rs_child_cb (ev::child &w, int revents)
		69	{
		70	w.stop ();
		71
		72	if (rs_queue.empty ())
		73	return;
		74
		75	pid_t pid = run_script (*rs_queue.front ().first, false);
		76	if (pid)
		77	{
		78	w.set (pid);
		79	w.start ();
		80	}
		81	else
		82	slog (L_WARN, rs_queue.front ().second);
		83
		84	delete rs_queue.front ().first;
		85	rs_queue.pop ();
		86	}
		87	};
		88
		89	// despite the fancy name, this is quite a hack
		90	static void
		91	run_script_queued (run_script_cb cb, const char warnmsg)
		92	{
		93	rs_queue.push (std::make_pair (cb, warnmsg));
		94
		95	if (!rs_child_ev.is_active ())
		96	{
		97	rs_child_ev.set<rs_child_cb> ();
		98	rs_child_ev ();
		99	}
		100	}
		101
		102	//////////////////////////////////////////////////////////////////////////////
62		103
63	struct crypto_ctx	104	struct crypto_ctx
64	{	105	{
65	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
66	HMAC_CTX hctx;	107	HMAC_CTX hctx;
67		108
68	crypto_ctx (const rsachallenge &challenge, int enc);	109	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
69	~crypto_ctx ();	110	~crypto_ctx ();
70	};	111	};
71		112
72	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	113	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
73	{	114	{
		115	ecdh_key s;
		116
		117	curve25519_combine (a, b, s);
		118
		119	{
		120	u8 mac_key[MAC_KEYSIZE];
		121	static const unsigned char mac_info[] = "gvpe mac key";
		122
		123	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		124	kdf.extract (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		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 (auth2.rsa.ikm, sizeof (auth2.rsa.ikm));
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
74	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (&cctx);
75	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
76	HMAC_CTX_init (&hctx);	147	}
77	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
78	}	148	}
79		149
80	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
81	{	151	{
82	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (&cctx));
83	HMAC_CTX_cleanup (&hctx);	153	HMAC_CTX_cleanup (&hctx);
84	}	154	}
85		155
		156	static inline void
		157	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		158	{
		159	if (RSA_public_encrypt (sizeof (auth.rsa),
		160	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		161	key, RSA_PKCS1_OAEP_PADDING) < 0)
		162	fatal ("RSA_public_encrypt error");
		163
		164	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		165	}
		166
		167	static inline bool
		168	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		169	{
		170	u8 rsa_decrypt[RSA_KEYLEN];
		171
		172	if (RSA_private_decrypt (sizeof (encr.rsa),
		173	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		174	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		175	return 0;
		176
		177	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		178	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		179
		180	return 1;
		181	}
		182
86	static void	183	static void
87	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	184	auth_hash (const auth_data &auth, auth_mac &mac)
88	{	185	{
89	EVP_MD_CTX ctx;	186	HMAC_CTX ctx;
90		187
91	EVP_MD_CTX_init (&ctx);	188	HMAC_CTX_init (&ctx);
92	EVP_DigestInit (&ctx, RSA_HASH);	189	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
93	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	190	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
94	EVP_DigestUpdate(&ctx, &id, sizeof id);	191	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
95	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
96	EVP_MD_CTX_cleanup (&ctx);	192	HMAC_CTX_cleanup (&ctx);
97	}	193	}
98		194
99	struct rsa_entry {	195	void
100	tstamp expire;	196	connection::generate_auth_data ()
101	rsaid id;
102	rsachallenge chg;
103	};
104
105	struct rsa_cache : list<rsa_entry>
106	{	197	{
107	void cleaner_cb (time_watcher &w); time_watcher cleaner;	198	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	{ }	199	{
		200	// request data
		201	RAND_bytes ((unsigned char *)&snd_auth.rsa, sizeof snd_auth.rsa);
		202	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		203	auth_hash (snd_auth, snd_auth_mac);
148		204
149	} rsa_cache;	205	// eventual response data
150		206	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	{	207	}
157	w.at = NOW + RSA_TTL;
158		208
159	for (iterator i = begin (); i != end (); )	209	// every use prolongs the expiry
160	if (i->expire <= NOW)	210	auth_expire = ev_now () + AUTH_TTL;
161	i = erase (i);
162	else
163	++i;
164	}
165	}	211	}
166		212
167	//////////////////////////////////////////////////////////////////////////////	213	//////////////////////////////////////////////////////////////////////////////
168		214
169	void pkt_queue::put (net_packet *p)	215	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		216	: max_ttl (max_ttl), max_queue (max_queue)
170	{	217	{
171	if (queue[i])	218	queue = new pkt [max_queue];
172	{
173	delete queue[i];
174	j = (j + 1) % QUEUEDEPTH;
175	}
176		219
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;	220	i = 0;
199	j = 0;	221	j = 0;
		222
		223	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
200	}	224	}
201		225
202	pkt_queue::~pkt_queue ()	226	pkt_queue::~pkt_queue ()
203	{	227	{
204	for (i = QUEUEDEPTH; --i > 0; )	228	while (net_packet *p = get ())
		229	delete p;
		230
205	delete queue[i];	231	delete [] queue;
206	}	232	}
207		233
		234	void
		235	pkt_queue::expire_cb (ev::timer &w, int revents)
		236	{
		237	ev_tstamp expire = ev_now () - max_ttl;
		238
		239	for (;;)
		240	{
		241	if (empty ())
		242	break;
		243
		244	double diff = queue[j].tstamp - expire;
		245
		246	if (diff >= 0.)
		247	{
		248	w.start (diff > 0.5 ? diff : 0.5);
		249	break;
		250	}
		251
		252	delete get ();
		253	}
		254	}
		255
		256	void
		257	pkt_queue::put (net_packet *p)
		258	{
		259	ev_tstamp now = ev_now ();
		260
		261	// start expiry timer
		262	if (empty ())
		263	expire.start (max_ttl);
		264
		265	int ni = i + 1 == max_queue ? 0 : i + 1;
		266
		267	if (ni == j)
		268	delete get ();
		269
		270	queue[i].pkt = p;
		271	queue[i].tstamp = now;
		272
		273	i = ni;
		274	}
		275
		276	net_packet *
		277	pkt_queue::get ()
		278	{
		279	if (empty ())
		280	return 0;
		281
		282	net_packet *p = queue[j].pkt;
		283	queue[j].pkt = 0;
		284
		285	j = j + 1 == max_queue ? 0 : j + 1;
		286
		287	return p;
		288	}
		289
208	struct net_rateinfo {	290	struct net_rateinfo
		291	{
209	u32 host;	292	u32 host;
210	double pcnt, diff;	293	double pcnt, diff;
211	tstamp last;	294	tstamp last;
212	};	295	};
213		296
214	// only do action once every x seconds per host whole allowing bursts.	297	// only do action once every x seconds per host whole allowing bursts.
215	// this implementation ("splay list" ;) is inefficient,	298	// this implementation ("splay list" ;) is inefficient,
216	// but low on resources.	299	// but low on resources.
217	struct net_rate_limiter : list<net_rateinfo>	300	struct net_rate_limiter : list<net_rateinfo>
218	{	301	{
219	static const double ALPHA = 1. - 1. / 600.; // allow bursts	302	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
220	static const double CUTOFF = 10.; // one event every CUTOFF seconds	303	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
221	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	304	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
222	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	305	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
223		306
224	bool can (const sockinfo &si) { return can((u32)si.host); }	307	bool can (const sockinfo &si) { return can((u32)si.host); }
225	bool can (u32 host);	308	bool can (u32 host);
226	};	309	};
227		310
228	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	311	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
229		312
		313	bool
230	bool net_rate_limiter::can (u32 host)	314	net_rate_limiter::can (u32 host)
231	{	315	{
232	iterator i;	316	iterator i;
233		317
234	for (i = begin (); i != end (); )	318	for (i = begin (); i != end (); )
235	if (i->host == host)	319	if (i->host == host)
236	break;	320	break;
237	else if (i->last < NOW - EXPIRE)	321	else if (i->last < ev_now () - NRL_EXPIRE)
238	i = erase (i);	322	i = erase (i);
239	else	323	else
240	i++;	324	i++;
241		325
242	if (i == end ())	326	if (i == end ())
243	{	327	{
244	net_rateinfo ri;	328	net_rateinfo ri;
245		329
246	ri.host = host;	330	ri.host = host;
247	ri.pcnt = 1.;	331	ri.pcnt = 1.;
248	ri.diff = MAXDIF;	332	ri.diff = NRL_MAXDIF;
249	ri.last = NOW;	333	ri.last = ev_now ();
250		334
251	push_front (ri);	335	push_front (ri);
252		336
253	return true;	337	return true;
254	}	338	}
255	else	339	else
256	{	340	{
257	net_rateinfo ri (*i);	341	net_rateinfo ri (*i);
258	erase (i);	342	erase (i);
259		343
260	ri.pcnt = ri.pcnt * ALPHA;	344	ri.pcnt = ri.pcnt * NRL_ALPHA;
261	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	345	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
262		346
263	ri.last = NOW;	347	ri.last = ev_now ();
264		348
265	double dif = ri.diff / ri.pcnt;	349	double dif = ri.diff / ri.pcnt;
266		350
267	bool send = dif > CUTOFF;	351	bool send = dif > NRL_CUTOFF;
268		352
269	if (dif > MAXDIF)	353	if (dif > NRL_MAXDIF)
270	{	354	{
271	ri.pcnt = 1.;	355	ri.pcnt = 1.;
272	ri.diff = MAXDIF;	356	ri.diff = NRL_MAXDIF;
273	}	357	}
274	else if (send)	358	else if (send)
275	ri.pcnt++;	359	ri.pcnt++;
276		360
277	push_front (ri);	361	push_front (ri);
282		366
283	/////////////////////////////////////////////////////////////////////////////	367	/////////////////////////////////////////////////////////////////////////////
284		368
285	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	369	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
286		370
		371	void
287	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx *ctx)
288	{	373	{
289	unsigned int xlen;	374	unsigned int xlen;
290		375
291	HMAC_CTX *hctx = &ctx->hctx;	376	HMAC_CTX *hctx = &ctx->hctx;
292		377
293	HMAC_Init_ex (hctx, 0, 0, 0, 0);	378	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
294	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	379	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
295	len - sizeof (hmac_packet));	380	len - sizeof (hmac_packet)));
296	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	381	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
297	}	382	}
298		383
299	void	384	void
300	hmac_packet::hmac_set (crypto_ctx *ctx)	385	hmac_packet::hmac_set (crypto_ctx *ctx)
301	{	386	{
…		…
310	hmac_gen (ctx);	395	hmac_gen (ctx);
311		396
312	return !memcmp (hmac, hmac_digest, HMACLENGTH);	397	return !memcmp (hmac, hmac_digest, HMACLENGTH);
313	}	398	}
314		399
		400	void
315	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	401	vpn_packet::set_hdr (ptype type_, unsigned int dst)
316	{	402	{
317	type = type_;	403	type = type_;
318		404
319	int src = THISNODE->id;	405	int src = THISNODE->id;
320		406
…		…
324	}	410	}
325		411
326	#define MAXVPNDATA (MAX_MTU - 6 - 6)	412	#define MAXVPNDATA (MAX_MTU - 6 - 6)
327	#define DATAHDR (sizeof (u32) + RAND_SIZE)	413	#define DATAHDR (sizeof (u32) + RAND_SIZE)
328		414
329	struct vpndata_packet:vpn_packet	415	struct vpndata_packet : vpn_packet
		416	{
		417	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		418
		419	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		420	tap_packet unpack (connection conn, u32 &seqno);
		421
		422	private:
		423	const u32 data_hdr_size () const
330	{	424	{
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;	425	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
340	}
341	};	426	}
		427	};
342		428
343	void	429	void
344	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	430	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
345	{	431	{
346	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	432	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
347	int outl = 0, outl2;	433	int outl = 0, outl2;
348	ptype type = PT_DATA_UNCOMPRESSED;	434	ptype type = PT_DATA_UNCOMPRESSED;
349		435
350	#if ENABLE_COMPRESSION	436	#if ENABLE_COMPRESSION
351	u8 cdata[MAX_MTU];	437	u8 cdata[MAX_MTU];
352	u32 cl;
353		438
		439	if (conn->features & FEATURE_COMPRESSION)
		440	{
354	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	441	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		442
355	if (cl)	443	if (cl)
356	{	444	{
357	type = PT_DATA_COMPRESSED;	445	type = PT_DATA_COMPRESSED;
358	d = cdata;	446	d = cdata;
359	l = cl + 2;	447	l = cl + 2;
360		448
361	d[0] = cl >> 8;	449	d[0] = cl >> 8;
362	d[1] = cl;	450	d[1] = cl;
		451	}
363	}	452	}
364	#endif	453	#endif
365		454
366	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	455	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
367		456
368	struct {	457	struct {
369	#if RAND_SIZE	458	#if RAND_SIZE
370	u8 rnd[RAND_SIZE];	459	u8 rnd[RAND_SIZE];
371	#endif	460	#endif
372	u32 seqno;	461	u32 seqno;
373	} datahdr;	462	} datahdr;
374		463
375	datahdr.seqno = ntohl (seqno);	464	datahdr.seqno = ntohl (seqno);
376	#if RAND_SIZE	465	#if RAND_SIZE
377	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	466	RAND_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
378	#endif	467	#endif
379		468
380	EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
381	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
382	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *) &datahdr, DATAHDR));
383	outl += outl2;	472	outl += outl2;
384		473
385	EVP_EncryptUpdate (cctx,	474	require (EVP_EncryptUpdate (cctx,
386	(unsigned char *) data + outl, &outl2,	475	(unsigned char *) data + outl, &outl2,
387	(unsigned char *) d, l);	476	(unsigned char *) d, l));
388	outl += outl2;	477	outl += outl2;
389		478
390	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	479	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
391	outl += outl2;	480	outl += outl2;
392		481
393	len = outl + data_hdr_size ();	482	len = outl + data_hdr_size ();
394		483
395	set_hdr (type, dst);	484	set_hdr (type, dst);
…		…
404	int outl = 0, outl2;	493	int outl = 0, outl2;
405	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
406	u8 *d;	495	u8 *d;
407	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
408		497
409	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
410		499
411	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
412	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
413		502
414	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
…		…
416	else	505	else
417	#endif	506	#endif
418	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6 - DATAHDR];
419		508
420	/* this overwrites part of the src mac, but we fix that later */	509	/* this overwrites part of the src mac, but we fix that later */
421	EVP_DecryptUpdate (cctx,	510	require (EVP_DecryptUpdate (cctx,
422	d, &outl2,	511	d, &outl2,
423	(unsigned char *)&data, len - data_hdr_size ());	512	(unsigned char *)&data, len - data_hdr_size ()));
424	outl += outl2;	513	outl += outl2;
425		514
426	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
427	outl += outl2;	516	outl += outl2;
428		517
429	seqno = ntohl ((u32 )(d + RAND_SIZE));	518	seqno = ntohl ((u32 )(d + RAND_SIZE));
430		519
431	id2mac (dst () ? dst() : THISNODE->id, p->dst);	520	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
456	}	545	}
457	};	546	};
458		547
459	struct config_packet : vpn_packet	548	struct config_packet : vpn_packet
460	{	549	{
461	// actually, hmaclen cannot be checked because the hmac
462	// field comes before this data, so peers with other
463	// hmacs simply will not work.
464	u8 prot_major, prot_minor, randsize, hmaclen;	550	u8 prot_major, prot_minor, randsize;
465	u8 flags, challengelen, pad2, pad3;	551	u8 flags, features, pad6, pad7, pad8;
466	u32 cipher_nid, digest_nid, hmac_nid;	552	u32 cipher_nid, mac_nid, auth_nid;
467
468	const u8 curflags () const
469	{
470	return 0x80
471	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
472	}
473		553
474	void setup (ptype type, int dst);	554	void setup (ptype type, int dst);
475	bool chk_config () const;	555	bool chk_config () const;
		556
		557	static u8 get_features ()
		558	{
		559	u8 f = 0;
		560	#if ENABLE_COMPRESSION
		561	f \|= FEATURE_COMPRESSION;
		562	#endif
		563	#if ENABLE_ROHC
		564	f \|= FEATURE_ROHC;
		565	#endif
		566	#if ENABLE_BRIDGING
		567	f \|= FEATURE_BRIDGING;
		568	#endif
		569	return f;
		570	}
476	};	571	};
477		572
		573	void
478	void config_packet::setup (ptype type, int dst)	574	config_packet::setup (ptype type, int dst)
479	{	575	{
480	prot_major = PROTOCOL_MAJOR;	576	prot_major = PROTOCOL_MAJOR;
481	prot_minor = PROTOCOL_MINOR;	577	prot_minor = PROTOCOL_MINOR;
482	randsize = RAND_SIZE;	578	randsize = RAND_SIZE;
483	hmaclen = HMACLENGTH;	579	flags = 0;
484	flags = curflags ();	580	features = get_features ();
485	challengelen = sizeof (rsachallenge);
486		581
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	hmac_nid = htonl (EVP_MD_type (DIGEST));	583	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		584	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
490		585
491	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	587	set_hdr (type, dst);
493	}	588	}
494		589
		590	bool
495	bool config_packet::chk_config () const	591	config_packet::chk_config () const
496	{	592	{
497	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
498	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	594	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
499	else if (randsize != RAND_SIZE)	595	else if (randsize != RAND_SIZE)
500	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	596	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
501	else if (hmaclen != HMACLENGTH)
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)))	597	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	598	slog (L_WARN, _("cipher algo mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
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)))	599	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));	600	slog (L_WARN, _("mac algo mismatch (remote %x <=> local %x)"), ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		601	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		602	slog (L_WARN, _("auth algo mismatch (remote %x <=> local %x)"), ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	603	else
514	return true;	604	return true;
515		605
516	return false;	606	return false;
517	}	607	}
518		608
519	struct auth_req_packet : config_packet	609	struct auth_req_packet : config_packet // UNPROTECTED
520	{	610	{
521	char magic[8];	611	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	612	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will get patches on forward)	613	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	614	u8 pad2, pad3;
525	rsaid id;	615	auth_encr encr;
526	rsaencrdata encr;
527		616
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	617	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	618	{
530	config_packet::setup (PT_AUTH_REQ, dst);	619	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	620	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	621	initiate = !!initiate_;
533	protocols = protocols_;	622	protocols = protocols_;
534		623
535	len = sizeof (*this) - sizeof (net_packet);	624	len = sizeof (*this) - sizeof (net_packet);
536	}	625	}
537	};	626	};
538		627
539	struct auth_res_packet : config_packet	628	struct auth_res_packet : config_packet // UNPROTECTED
540	{	629	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	630	auth_response response;
545		631
546	auth_res_packet (int dst)	632	auth_res_packet (int dst)
547	{	633	{
548	config_packet::setup (PT_AUTH_RES, dst);	634	config_packet::setup (PT_AUTH_RES, dst);
549		635
…		…
583	};	669	};
584		670
585	/////////////////////////////////////////////////////////////////////////////	671	/////////////////////////////////////////////////////////////////////////////
586		672
587	void	673	void
588	connection::connection_established ()	674	connection::connection_established (const sockinfo &rsi)
589	{	675	{
		676	if (!have_snd_auth \|\| !have_rcv_auth)
		677	return;
		678
		679	si = rsi;
		680	protocol = rsi.prot;
		681
		682	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		683	conf->nodename, (const char *)rsi,
		684	is_direct ? "direct" : "forwarded",
		685	PROTOCOL_MAJOR, prot_minor);
		686
		687	if (::conf.script_node_up)
		688	{
		689	run_script_cb *cb = new run_script_cb;
		690	cb->set<connection, &connection::script_node_up> (this);
		691	run_script_queued (cb, _("node-up command execution failed, continuing."));
		692	}
		693
		694	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		695	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		696
		697	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		698	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		699
590	if (ictx && octx)	700	if (ictx && octx)
591	{	701	{
592	connectmode = conf->connectmode;	702	// make sure rekeying timeouts are slightly asymmetric
		703	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		704	rekey.start (rekey_interval, rekey_interval);
593		705
594	rekey.start (NOW + ::conf.rekey);
595	keepalive.start (NOW + ::conf.keepalive);	706	keepalive.start (::conf.keepalive);
596		707
597	// send queued packets	708	// send queued packets
598	if (ictx && octx)	709	if (ictx && octx)
599	{	710	{
600	while (tap_packet p = (tap_packet )data_queue.get ())	711	while (tap_packet p = (tap_packet )data_queue.get ())
601	{	712	{
602	send_data_packet (p);	713	if (p->len) send_data_packet (p);
603	delete p;	714	delete p;
604	}	715	}
605		716
606	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	717	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
607	{	718	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);	719	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;	720	delete p;
610	}	721	}
611	}	722	}
		723
		724	vpn->connection_established (this);
612	}	725	}
		726	#if 0
613	else	727	else
614	{	728	{
615	retry_cnt = 0;	729	retry_cnt = 0;
616	establish_connection.start (NOW + 5);	730	establish_connection.start (5);
617	keepalive.reset ();	731	keepalive.stop ();
618	rekey.reset ();	732	rekey.stop ();
619	}	733	}
		734	#endif
620	}	735	}
621		736
622	void	737	void
623	connection::reset_si ()	738	connection::reset_si ()
624	{	739	{
		740	if (vpn->can_direct (THISNODE, conf))
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);	741	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
626		742	else
627	// mask out protocols we cannot establish	743	{
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	744	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	745	protocol = 0;
		746	}
630		747
631	si.set (conf, protocol);	748	si.set (conf, protocol);
		749
		750	is_direct = si.valid ();
632	}	751	}
633		752
634	// ensure sockinfo is valid, forward if necessary	753	// ensure sockinfo is valid, forward if necessary
635	const sockinfo &	754	const sockinfo &
636	connection::forward_si (const sockinfo &si) const	755	connection::forward_si (const sockinfo &si) const
637	{	756	{
638	if (!si.valid ())	757	if (!si.valid ())
639	{	758	{
640	connection *r = vpn->find_router ();	759	connection *r = vpn->find_router_for (this);
641		760
642	if (r)	761	if (r)
643	{	762	{
644	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	763	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
645	conf->nodename, r->conf->nodename);	764	conf->nodename, r->conf->nodename);
646	return r->si;	765	return r->si;
647	}	766	}
648	else	767	else
649	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	768	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
650	conf->nodename);	769	conf->nodename);
651	}	770	}
652		771
653	return si;	772	return si;
654	}	773	}
…		…
664	connection::send_ping (const sockinfo &si, u8 pong)	783	connection::send_ping (const sockinfo &si, u8 pong)
665	{	784	{
666	ping_packet *pkt = new ping_packet;	785	ping_packet *pkt = new ping_packet;
667		786
668	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	787	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		788
		789	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
669	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	790	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
670		791
671	delete pkt;	792	delete pkt;
672	}	793	}
673		794
…		…
688	void	809	void
689	connection::send_auth_request (const sockinfo &si, bool initiate)	810	connection::send_auth_request (const sockinfo &si, bool initiate)
690	{	811	{
691	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	812	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
692		813
693	rsachallenge chg;	814	generate_auth_data ();
		815	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
694		816
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);	817	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	818	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
705		819
706	delete pkt;	820	delete pkt;
707	}	821	}
708		822
709	void	823	void
710	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	824	connection::send_auth_response (const sockinfo &si)
711	{	825	{
712	auth_res_packet *pkt = new auth_res_packet (conf->id);	826	auth_res_packet *pkt = new auth_res_packet (conf->id);
713		827
714	pkt->id = id;	828	auth_hash (rcv_auth, pkt->response.mac);
		829	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
715		830
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);	831	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	832	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
723		833
724	delete pkt;	834	delete pkt;
725	}	835	}
726		836
727	void	837	void
728	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	838	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
729	{	839	{
730	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	840	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
731	conf->id, rid, (const char *)rsi);	841	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		842	conf->protocols);
732		843
733	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	844	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
734		845
735	r->hmac_set (octx);	846	r->hmac_set (octx);
736	send_vpn_packet (r, si);	847	send_vpn_packet (r, si);
737		848
738	delete r;	849	delete r;
739	}	850	}
740		851
741	void	852	inline void
742	connection::establish_connection_cb (time_watcher &w)	853	connection::establish_connection_cb (ev::timer &w, int revents)
743	{	854	{
744	if (ictx \|\| conf == THISNODE	855	if (!(ictx && octx)
		856	&& conf != THISNODE
745	\|\| connectmode == conf_node::C_NEVER	857	&& connectmode != conf_node::C_NEVER
746	\|\| connectmode == conf_node::C_DISABLED)	858	&& connectmode != conf_node::C_DISABLED
747	w.at = TSTAMP_CANCEL;	859	&& !w.is_active ())
748	else if (w.at <= NOW)
749	{	860	{
750	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	861	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
751		862	// and stop trying. should probably be handled by a per-connection expire handler.
752	if (retry_int < 3600 * 8)	863	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		864	{
		865	reset_connection ();
753	retry_cnt++;	866	return;
		867	}
754		868
755	w.at = NOW + retry_int;	869	last_establish_attempt = ev_now ();
		870
		871	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		872	? (retry_cnt & 3) + 1
		873	: 1 << (retry_cnt >> 2));
756		874
757	reset_si ();	875	reset_si ();
758		876
759	if (si.prot && !si.host)	877	bool slow = si.prot & PROT_SLOW;
		878
		879	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		880	{
		881	/TODO/ /* start the timer so we don't recurse endlessly */
		882	w.start (1);
760	vpn->send_connect_request (conf->id);	883	vpn->send_connect_request (this);
		884	}
761	else	885	else
762	{	886	{
		887	if (si.valid ())
		888	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		889	conf->nodename, (const char *)si);
		890
763	const sockinfo &dsi = forward_si (si);	891	const sockinfo &dsi = forward_si (si);
		892
		893	slow = slow \|\| (dsi.prot & PROT_SLOW);
764		894
765	if (dsi.valid () && auth_rate_limiter.can (dsi))	895	if (dsi.valid () && auth_rate_limiter.can (dsi))
766	{	896	{
767	if (retry_cnt < 4)	897	if (retry_cnt < 4)
768	send_auth_request (dsi, true);	898	send_auth_request (dsi, true);
769	else	899	else
770	send_ping (dsi, 0);	900	send_ping (dsi, 0);
771	}	901	}
772	}	902	}
		903
		904	retry_int *= slow ? 8. : 0.9;
		905
		906	if (retry_int < conf->max_retry)
		907	retry_cnt++;
		908	else
		909	retry_int = conf->max_retry;
		910
		911	w.start (retry_int);
773	}	912	}
774	}	913	}
775		914
776	void	915	void
777	connection::reset_connection ()	916	connection::reset_connection ()
…		…
780	{	919	{
781	slog (L_INFO, _("%s(%s): connection lost"),	920	slog (L_INFO, _("%s(%s): connection lost"),
782	conf->nodename, (const char *)si);	921	conf->nodename, (const char *)si);
783		922
784	if (::conf.script_node_down)	923	if (::conf.script_node_down)
785	run_script (run_script_cb (this, &connection::script_node_down), false);	924	{
		925	run_script_cb *cb = new run_script_cb;
		926	cb->set<connection, &connection::script_node_down> (this);
		927	run_script_queued (cb, _("node-down command execution failed, continuing."));
		928	}
786	}	929	}
787		930
788	delete ictx; ictx = 0;	931	delete ictx; ictx = 0;
789	delete octx; octx = 0;	932	delete octx; octx = 0;
790		933
791	si.host= 0;	934	si.host = 0;
792		935
		936	have_snd_auth = false;
		937	have_rcv_auth = false;
		938	auth_expire = 0.;
		939
793	last_activity = 0;	940	last_activity = 0.;
		941	//last_si_change = 0.;
794	retry_cnt = 0;	942	retry_cnt = 0;
795		943
796	rekey.reset ();	944	rekey.stop ();
797	keepalive.reset ();	945	keepalive.stop ();
798	establish_connection.reset ();	946	establish_connection.stop ();
799	}	947	}
800		948
801	void	949	void
802	connection::shutdown ()	950	connection::shutdown ()
803	{	951	{
…		…
805	send_reset (si);	953	send_reset (si);
806		954
807	reset_connection ();	955	reset_connection ();
808	}	956	}
809		957
810	void	958	// poor-man's rekeying
811	connection::rekey_cb (time_watcher &w)	959	inline void
		960	connection::rekey_cb (ev::timer &w, int revents)
812	{	961	{
813	w.at = TSTAMP_CANCEL;
814
815	reset_connection ();	962	reset_connection ();
816	establish_connection ();	963	establish_connection ();
817	}	964	}
818		965
819	void	966	void
820	connection::send_data_packet (tap_packet *pkt, bool broadcast)	967	connection::send_data_packet (tap_packet *pkt)
821	{	968	{
822	vpndata_packet *p = new vpndata_packet;	969	vpndata_packet *p = new vpndata_packet;
823	int tos = 0;	970	int tos = 0;
824		971
825	// I am not hilarious about peeking into packets, but so be it.	972	// I am not hilarious about peeking into packets, but so be it.
826	if (conf->inherit_tos	973	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;	974	tos = (*pkt)[15] & IPTOS_TOS_MASK;
830		975
831	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	976	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
832	send_vpn_packet (p, si, tos);	977	send_vpn_packet (p, si, tos);
833		978
834	delete p;	979	delete p;
835		980
836	if (oseqno > MAX_SEQNO)	981	if (oseqno > MAX_SEQNO)
837	rekey ();	982	rekey ();
838	}	983	}
839		984
840	void	985	void
		986	connection::post_inject_queue ()
		987	{
		988	// force a connection every now and when when packets are sent (max 1/s)
		989	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		990	establish_connection.stop ();
		991
		992	establish_connection ();
		993	}
		994
		995	void
841	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	996	connection::inject_data_packet (tap_packet *pkt)
842	{	997	{
843	if (ictx && octx)	998	if (ictx && octx)
844	send_data_packet (pkt, broadcast);	999	send_data_packet (pkt);
845	else	1000	else
846	{	1001	{
847	if (!broadcast)//DDDD
848	data_queue.put (new tap_packet (*pkt));	1002	data_queue.put (new tap_packet (*pkt));
849		1003	post_inject_queue ();
850	establish_connection ();
851	}	1004	}
852	}	1005	}
853		1006
		1007	void
854	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1008	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
855	{	1009	{
856	if (ictx && octx)	1010	if (ictx && octx)
857	send_vpn_packet (pkt, si, tos);	1011	send_vpn_packet (pkt, si, tos);
858	else	1012	else
859	{	1013	{
860	vpn_queue.put (new vpn_packet (*pkt));	1014	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
861		1015	post_inject_queue ();
862	establish_connection ();
863	}	1016	}
864	}	1017	}
865		1018
866	void	1019	void
867	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1020	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
868	{	1021	{
869	last_activity = NOW;	1022	last_activity = ev_now ();
870		1023
871	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1024	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
872	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1025	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1026
		1027	if (connectmode == conf_node::C_DISABLED)
		1028	return;
873		1029
874	switch (pkt->typ ())	1030	switch (pkt->typ ())
875	{	1031	{
876	case vpn_packet::PT_PING:	1032	case vpn_packet::PT_PING:
		1033	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1034
877	// we send pings instead of auth packets after some retries,	1035	// we send pings instead of auth packets after some retries,
878	// so reset the retry counter and establish a connection	1036	// so reset the retry counter and establish a connection
879	// when we receive a ping.	1037	// when we receive a ping.
880	if (!ictx)	1038	if (!ictx)
881	{	1039	{
882	if (auth_rate_limiter.can (rsi))	1040	if (auth_rate_limiter.can (rsi))
883	send_auth_request (rsi, true);	1041	send_auth_request (rsi, true);
884	}	1042	}
885	else	1043	else
		1044	// we would love to change the socket address here, but ping's aren't
		1045	// authenticated, so we best ignore it.
886	send_ping (rsi, 1); // pong	1046	send_ping (rsi, 1); // pong
887		1047
888	break;	1048	break;
889		1049
890	case vpn_packet::PT_PONG:	1050	case vpn_packet::PT_PONG:
		1051	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1052
		1053	// a PONG might mean that the other side doesn't really know
		1054	// about our desire for communication.
		1055	establish_connection ();
891	break;	1056	break;
892		1057
893	case vpn_packet::PT_RESET:	1058	case vpn_packet::PT_RESET:
894	{	1059	{
895	reset_connection ();	1060	reset_connection ();
896		1061
897	config_packet p = (config_packet ) pkt;	1062	config_packet p = (config_packet ) pkt;
898		1063
899	if (!p->chk_config ())	1064	if (!p->chk_config ())
900	{	1065	{
901	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1066	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
902	conf->nodename, (const char *)rsi);	1067	conf->nodename, (const char *)rsi);
903	connectmode = conf_node::C_DISABLED;	1068	connectmode = conf_node::C_DISABLED;
904	}	1069	}
905	else if (connectmode == conf_node::C_ALWAYS)	1070	else if (connectmode == conf_node::C_ALWAYS)
906	establish_connection ();	1071	establish_connection ();
…		…
908	break;	1073	break;
909		1074
910	case vpn_packet::PT_AUTH_REQ:	1075	case vpn_packet::PT_AUTH_REQ:
911	if (auth_rate_limiter.can (rsi))	1076	if (auth_rate_limiter.can (rsi))
912	{	1077	{
913	auth_req_packet p = (auth_req_packet ) pkt;	1078	auth_req_packet p = (auth_req_packet )pkt;
914		1079
915	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1080	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1081	conf->nodename, p->initiate ? "initiate" : "reply",
		1082	p->protocols, p->features);
916		1083
917	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1084	if (p->chk_config () && !memcmp (p->magic, MAGIC, 8))
918	{	1085	{
919	if (p->prot_minor != PROTOCOL_MINOR)	1086	if (p->prot_minor != PROTOCOL_MINOR)
920	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1087	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
921	conf->nodename, (const char *)rsi,	1088	conf->nodename, (const char *)rsi,
922	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1089	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
923		1090
924	if (p->initiate)	1091	if (p->initiate)
925	send_auth_request (rsi, false);	1092	send_auth_request (rsi, false);
926		1093
927	rsachallenge k;	1094	auth_data auth;
928		1095
929	if (0 > RSA_private_decrypt (sizeof (p->encr),	1096	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
930	(unsigned char )&p->encr, (unsigned char )&k,	1097	{
931	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
932	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1098	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));	1099	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1100	}
934	else	1101	else
935	{	1102	{
936	delete octx;	1103	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
937		1104
938	octx = new crypto_ctx (k, 1);	1105	rcv_auth = auth;
939	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1106	have_rcv_auth = true;
940		1107
		1108	send_auth_response (rsi);
		1109
		1110	if (chg)
		1111	{
941	conf->protocols = p->protocols;	1112	conf->protocols = p->protocols;
		1113	features = p->features & config_packet::get_features ();
942		1114
943	send_auth_response (rsi, p->id, k);
944
945	connection_established ();	1115	connection_established (rsi);
946
947	break;	1116	}
948	}	1117	}
		1118
		1119	break;
949	}	1120	}
950	else	1121	else
951	slog (L_WARN, _("%s(%s): protocol mismatch"),	1122	slog (L_WARN, _("%s(%s): protocol mismatch."),
952	conf->nodename, (const char *)rsi);	1123	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	if (p->chk_config ())
966	{	1137	{
967	if (p->prot_minor != PROTOCOL_MINOR)	1138	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
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	{	1139	{
976	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1140	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
977	conf->nodename, (const char *)rsi);	1141	conf->nodename, (const char *)rsi);
978	break;
979	}	1142	}
980	else	1143	else if (!have_snd_auth)
981	{	1144	{
982	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1145	if (p->prot_minor != PROTOCOL_MINOR)
983		1146	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
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);	1147	conf->nodename, (const char *)rsi,
989	break;	1148	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
990	}
991	else
992	{
993	rsaresponse h;
994		1149
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;	1150	prot_minor = p->prot_minor;
		1151	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
1000		1152
1001	delete ictx; ictx = cctx;	1153	have_snd_auth = true;
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 ();	1154	connection_established (rsi);
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	}	1155	}
		1156
		1157	break;
1026	}	1158	}
1027	}	1159	}
1028		1160
1029	send_reset (rsi);	1161	send_reset (rsi);
1030	break;	1162	break;
…		…
1041	{	1173	{
1042	vpndata_packet p = (vpndata_packet )pkt;	1174	vpndata_packet p = (vpndata_packet )pkt;
1043		1175
1044	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1045	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1177	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1046	"could be an attack, or just corruption or an synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1047	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1048	else	1180	else
1049	{	1181	{
1050	u32 seqno;	1182	u32 seqno;
1051	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1052		1185
1053	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1054	{	1187	{
1055	vpn->tap->send (d);	1188	vpn->tap->send (d);
1056		1189
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)	1190	if (si != rsi)
1067	{	1191	{
1068	// fast re-sync on connection changes, useful especially for tcp/ip	1192	// fast re-sync on source address changes, useful especially for tcp/ip
		1193	//if (last_si_change < ev_now () + 5.)
1069	si = rsi;	1194	// {
1070
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1072	conf->nodename, (const char )si, (const char )rsi);	1196	conf->nodename, (const char )si, (const char )rsi);
		1197
		1198	si = rsi;
		1199
		1200	if (::conf.script_node_change)
		1201	{
		1202	run_script_cb *cb = new run_script_cb;
		1203	cb->set<connection, &connection::script_node_change> (this);
		1204	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1205	}
		1206
		1207	// }
		1208	//else
		1209	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1210	// conf->nodename, (const char )si, (const char )rsi);
1073	}	1211	}
1074
1075	delete d;
1076
1077	break;
1078	}	1212	}
		1213	else if (seqclass == 1) // far history
		1214	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1217	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1218	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1219	else if (seqclass == 3) // reset
		1220	{
		1221	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1222	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1223	send_reset (rsi);
		1224	}
		1225
		1226	delete d;
		1227	break;
1079	}	1228	}
1080	}	1229	}
1081		1230
1082	send_reset (rsi);	1231	send_reset (rsi);
1083	break;	1232	break;
1084		1233
1085	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1086	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1087	{	1236	{
1088	connect_req_packet p = (connect_req_packet ) pkt;	1237	connect_req_packet p = (connect_req_packet )pkt;
1089		1238
1090	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1239	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	{	1240	{
		1241	connection *c = vpn->conns[p->id - 1];
		1242	conf->protocols = p->protocols;
		1243
		1244	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1245	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1246	p->protocols,
		1247	c->ictx && c->octx);
		1248
		1249	if (c->ictx && c->octx)
		1250	{
1099	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1100	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
1101	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
1102	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1254	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1255	}
		1256	else
		1257	c->establish_connection ();
1103	}	1258	}
1104	else	1259	else
1105	c->establish_connection ();	1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
1106	}	1263	}
1107		1264
1108	break;	1265	break;
1109		1266
1110	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
1111	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1112	{	1269	{
1113	connect_info_packet p = (connect_info_packet ) pkt;	1270	connect_info_packet p = (connect_info_packet )pkt;
1114		1271
1115	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1272	if (p->id > 0 && p->id <= vpn->conns.size ())
1116		1273	{
1117	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1118		1275
1119	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1120	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1277	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1121	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1122		1279
1123	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1280	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);	1281	conf->nodename,
		1282	vpn->conns[p->id - 1]->conf->nodename,
		1283	(const char *)p->si,
		1284	p->protocols,
		1285	protocol,
		1286	p->si.supported_protocols (c->conf),
		1287	!c->ictx && !c->octx);
1125		1288
1126	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1127		1290
1128	if (dsi.valid ())	1291	if (dsi.valid ())
1129	c->send_auth_request (dsi, true);	1292	c->send_auth_request (dsi, true);
		1293	else
		1294	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1295	vpn->conns[p->id - 1]->conf->nodename,
		1296	(const char *)p->si);
		1297	}
		1298	else
		1299	slog (L_WARN,
		1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1301	p->id);
1130	}	1302	}
1131		1303
1132	break;	1304	break;
1133		1305
1134	default:	1306	default:
1135	send_reset (rsi);	1307	send_reset (rsi);
1136	break;	1308	break;
1137	}	1309	}
1138	}	1310	}
1139		1311
1140	void connection::keepalive_cb (time_watcher &w)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1141	{	1314	{
1142	if (NOW >= last_activity + ::conf.keepalive + 30)	1315	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1316
		1317	if (when >= 0)
		1318	w.start (when);
		1319	else if (when < -15)
1143	{	1320	{
1144	reset_connection ();	1321	reset_connection ();
1145	establish_connection ();	1322	establish_connection ();
1146	}	1323	}
1147	else if (NOW < last_activity + ::conf.keepalive)
1148	w.at = last_activity + ::conf.keepalive;
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1326	{
		1327	w.start (3);
1152	send_ping (si);	1328	send_ping (si);
1153	w.at = NOW + 5;
1154	}	1329	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1156	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1158	w.at = last_activity + ::conf.keepalive + 10;	1333	w.start (when + 10);
1159	else	1334	else
1160	reset_connection ();	1335	reset_connection ();
1161	}	1336	}
1162		1337
		1338	void
1163	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1164	{	1340	{
1165	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1341	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1166		1342
1167	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1343	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1344	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1345	THISNODE->protocols);
1168	p->hmac_set (octx);	1346	p->hmac_set (octx);
1169	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1170		1348
1171	delete p;	1349	delete p;
1172	}	1350	}
1173		1351
1174	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1175	{	1354	{
1176	vpn->script_if_up ();
1177
1178	char *env;	1355	char *env;
		1356	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1357	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1358	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1359	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1360	conf->id & 0xff); putenv (env);
		1361	}
		1362
		1363	void
		1364	connection::script_init_connect_env ()
		1365	{
		1366	vpn->script_init_env ();
		1367
		1368	char *env;
1179	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1369	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1370	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1180	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1181	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1182	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1183	}	1374	}
1184		1375
		1376	inline const char *
1185	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1186	{	1378	{
1187	script_node ();	1379	script_init_connect_env ();
1188		1380
1189	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1190		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1191	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1192	}
1193		1388
		1389	return filename;
		1390	}
		1391
		1392	inline const char *
		1393	connection::script_node_change ()
		1394	{
		1395	script_init_connect_env ();
		1396
		1397	putenv ((char *)"STATE=change");
		1398
		1399	char *filename;
		1400	asprintf (&filename,
		1401	"%s/%s",
		1402	confbase,
		1403	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1404
		1405	return filename;
		1406	}
		1407
		1408	inline const char *
1194	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1195	{	1410	{
1196	script_node ();	1411	script_init_connect_env ();
1197		1412
1198	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1199		1414
1200	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
1201	}	1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1202		1420
		1421	return filename;
		1422	}
		1423
1203	connection::connection(struct vpn *vpn_)	1424	connection::connection (struct vpn vpn, conf_node conf)
1204	: vpn(vpn_)	1425	: vpn(vpn), conf(conf),
1205	, rekey (this, &connection::rekey_cb)	1426	#if ENABLE_DNS
1206	, keepalive (this, &connection::keepalive_cb)	1427	dns (0),
		1428	#endif
		1429	data_queue(conf->max_ttl, conf->max_queue + 1),
		1430	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1431	{
		1432	rekey .set<connection, &connection::rekey_cb > (this);
		1433	keepalive .set<connection, &connection::keepalive_cb > (this);
1207	, establish_connection (this, &connection::establish_connection_cb)	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1208	{	1435
		1436	last_establish_attempt = 0.;
1209	octx = ictx = 0;	1437	octx = ictx = 0;
1210	retry_cnt = 0;
1211		1438
1212	connectmode = conf_node::C_ALWAYS; // initial setting	1439	connectmode = conf->connectmode;
		1440
		1441	// queue a dummy packet to force an initial connection attempt
		1442	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1443	vpn_queue.put (new net_packet);
		1444
1213	reset_connection ();	1445	reset_connection ();
1214	}	1446	}
1215		1447
1216	connection::~connection ()	1448	connection::~connection ()
1217	{	1449	{
1218	shutdown ();	1450	shutdown ();
1219	}	1451	}
1220		1452
		1453	void
1221	void connection_init ()	1454	connection_init ()
1222	{	1455	{
1223	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1224	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1225	}	1458	}
1226		1459

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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 1.100 by root, Wed Jul 17 05:34:17 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 1.100 by root, Wed Jul 17 05:34:17 2013 UTC