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

Comparing gvpe/src/connection.C (file contents):
Revision 1.25 by pcg, Sat Jan 17 01:18:36 2004 UTC vs.
Revision 1.88 by root, Thu Dec 2 07:15:14 2010 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	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
6	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
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	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
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	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
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	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.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	extern "C" {
23	# include "lzf/lzf.h"
24	}
25
26	#include <cassert>
27
28	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
29		37
30	#include <openssl/rand.h>	38	#include <openssl/rand.h>
31	#include <openssl/evp.h>	39	#include <openssl/evp.h>
32	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
33	#include <openssl/err.h>	41	#include <openssl/err.h>
34
35	#include "gettext.h"
36		42
37	#include "conf.h"	43	#include "conf.h"
38	#include "slog.h"	44	#include "slog.h"
39	#include "device.h"	45	#include "device.h"
40	#include "vpn.h"	46	#include "vpn.h"
44		50
45	#if !HAVE_RAND_PSEUDO_BYTES	51	#if !HAVE_RAND_PSEUDO_BYTES
46	# define RAND_pseudo_bytes RAND_bytes	52	# define RAND_pseudo_bytes RAND_bytes
47	#endif	53	#endif
48		54
49	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	55	#define MAGIC_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol)
		56	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated)
		57
		58	#define ULTRA_FAST 1
		59	#define HLOG 15
		60	#include "lzf/lzf.h"
		61	#include "lzf/lzf_c.c"
		62	#include "lzf/lzf_d.c"
		63
		64	//////////////////////////////////////////////////////////////////////////////
		65
		66	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		67	static ev::child rs_child_ev;
		68
		69	void // c++ requires external linkage here, apparently :(
		70	rs_child_cb (ev::child &w, int revents)
		71	{
		72	w.stop ();
		73
		74	if (rs_queue.empty ())
		75	return;
		76
		77	pid_t pid = run_script (*rs_queue.front ().first, false);
		78	if (pid)
		79	{
		80	w.set (pid);
		81	w.start ();
		82	}
		83	else
		84	slog (L_WARN, rs_queue.front ().second);
		85
		86	delete rs_queue.front ().first;
		87	rs_queue.pop ();
		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	//////////////////////////////////////////////////////////////////////////////
50		104
51	struct crypto_ctx	105	struct crypto_ctx
52	{	106	{
53	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	108	HMAC_CTX hctx;
…		…
58	};	112	};
59		113
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
61	{	115	{
62	EVP_CIPHER_CTX_init (&cctx);	116	EVP_CIPHER_CTX_init (&cctx);
63	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	117	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
64	HMAC_CTX_init (&hctx);	118	HMAC_CTX_init (&hctx);
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	119	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	120	}
67		121
68	crypto_ctx::~crypto_ctx ()	122	crypto_ctx::~crypto_ctx ()
69	{	123	{
70	EVP_CIPHER_CTX_cleanup (&cctx);	124	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	125	HMAC_CTX_cleanup (&hctx);
72	}	126	}
73		127
74	static void	128	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	129	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
76	{	130	{
77	EVP_MD_CTX ctx;	131	EVP_MD_CTX ctx;
78		132
79	EVP_MD_CTX_init (&ctx);	133	EVP_MD_CTX_init (&ctx);
80	EVP_DigestInit (&ctx, RSA_HASH);	134	require (EVP_DigestInit (&ctx, RSA_HASH));
81	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	135	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	EVP_DigestUpdate(&ctx, &id, sizeof id);	136	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	137	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);	138	EVP_MD_CTX_cleanup (&ctx);
85	}	139	}
86		140
87	struct rsa_entry {	141	struct rsa_entry
		142	{
88	tstamp expire;	143	tstamp expire;
89	rsaid id;	144	rsaid id;
90	rsachallenge chg;	145	rsachallenge chg;
91	};	146	};
92		147
93	struct rsa_cache : list<rsa_entry>	148	struct rsa_cache : list<rsa_entry>
94	{	149	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	150	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
96		151
97	bool find (const rsaid &id, rsachallenge &chg)	152	bool find (const rsaid &id, rsachallenge &chg)
98	{	153	{
99	for (iterator i = begin (); i != end (); ++i)	154	for (iterator i = begin (); i != end (); ++i)
100	{	155	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	156	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
102	{	157	{
103	memcpy (&chg, &i->chg, sizeof chg);	158	memcpy (&chg, &i->chg, sizeof chg);
104		159
105	erase (i);	160	erase (i);
106	return true;	161	return true;
107	}	162	}
108	}	163	}
109		164
110	if (cleaner.at < NOW)	165	if (!cleaner.is_active ())
111	cleaner.start (NOW + RSA_TTL);	166	cleaner.again ();
112		167
113	return false;	168	return false;
114	}	169	}
115		170
116	void gen (rsaid &id, rsachallenge &chg)	171	void gen (rsaid &id, rsachallenge &chg)
117	{	172	{
118	rsa_entry e;	173	rsa_entry e;
119		174
120	RAND_bytes ((unsigned char *)&id, sizeof id);	175	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);	176	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122		177
123	e.expire = NOW + RSA_TTL;	178	e.expire = ev_now () + RSA_TTL;
124	e.id = id;	179	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);	180	memcpy (&e.chg, &chg, sizeof chg);
126		181
127	push_back (e);	182	push_back (e);
128		183
129	if (cleaner.at < NOW)	184	if (!cleaner.is_active ())
130	cleaner.start (NOW + RSA_TTL);	185	cleaner.again ();
131	}	186	}
132		187
133	rsa_cache ()	188	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)	189	{
135	{ }	190	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
		191	cleaner.set (RSA_TTL, RSA_TTL);
		192	}
136		193
137	} rsa_cache;	194	} rsa_cache;
138		195
139	void rsa_cache::cleaner_cb (time_watcher &w)	196	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
140	{	197	{
141	if (!empty ())	198	if (empty ())
		199	w.stop ();
		200	else
142	{	201	{
143	w.start (NOW + RSA_TTL);
144
145	for (iterator i = begin (); i != end (); )	202	for (iterator i = begin (); i != end (); )
146	if (i->expire <= NOW)	203	if (i->expire <= ev_now ())
147	i = erase (i);	204	i = erase (i);
148	else	205	else
149	++i;	206	++i;
150	}	207	}
151	}	208	}
152		209
153	//////////////////////////////////////////////////////////////////////////////	210	//////////////////////////////////////////////////////////////////////////////
154		211
155	void pkt_queue::put (net_packet *p)	212	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		213	: max_ttl (max_ttl), max_queue (max_queue)
156	{	214	{
157	if (queue[i])	215	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		216
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	217	i = 0;
185	j = 0;	218	j = 0;
		219
		220	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	221	}
187		222
188	pkt_queue::~pkt_queue ()	223	pkt_queue::~pkt_queue ()
189	{	224	{
190	for (i = QUEUEDEPTH; --i > 0; )	225	while (net_packet *p = get ())
		226	delete p;
		227
191	delete queue[i];	228	delete [] queue;
192	}	229	}
193		230
		231	void pkt_queue::expire_cb (ev::timer &w, int revents)
		232	{
		233	ev_tstamp expire = ev_now () - max_ttl;
		234
		235	for (;;)
		236	{
		237	if (empty ())
		238	break;
		239
		240	double diff = queue[j].tstamp - expire;
		241
		242	if (diff >= 0.)
		243	{
		244	w.start (diff > 0.5 ? diff : 0.5);
		245	break;
		246	}
		247
		248	delete get ();
		249	}
		250	}
		251
		252	void pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *pkt_queue::get ()
		272	{
		273	if (empty ())
		274	return 0;
		275
		276	net_packet *p = queue[j].pkt;
		277	queue[j].pkt = 0;
		278
		279	j = j + 1 == max_queue ? 0 : j + 1;
		280
		281	return p;
		282	}
		283
194	struct net_rateinfo {	284	struct net_rateinfo
		285	{
195	u32 host;	286	u32 host;
196	double pcnt, diff;	287	double pcnt, diff;
197	tstamp last;	288	tstamp last;
198	};	289	};
199		290
200	// only do action once every x seconds per host whole allowing bursts.	291	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	292	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	293	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	294	struct net_rate_limiter : list<net_rateinfo>
204	{	295	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	296	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	297	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	298	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	299	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		300
210	bool can (const sockinfo &si) { return can((u32)si.host); }	301	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	302	bool can (u32 host);
212	};	303	};
213		304
…		…
218	iterator i;	309	iterator i;
219		310
220	for (i = begin (); i != end (); )	311	for (i = begin (); i != end (); )
221	if (i->host == host)	312	if (i->host == host)
222	break;	313	break;
223	else if (i->last < NOW - EXPIRE)	314	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	315	i = erase (i);
225	else	316	else
226	i++;	317	i++;
227		318
228	if (i == end ())	319	if (i == end ())
229	{	320	{
230	net_rateinfo ri;	321	net_rateinfo ri;
231		322
232	ri.host = host;	323	ri.host = host;
233	ri.pcnt = 1.;	324	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	325	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	326	ri.last = ev_now ();
236		327
237	push_front (ri);	328	push_front (ri);
238		329
239	return true;	330	return true;
240	}	331	}
241	else	332	else
242	{	333	{
243	net_rateinfo ri (*i);	334	net_rateinfo ri (*i);
244	erase (i);	335	erase (i);
245		336
246	ri.pcnt = ri.pcnt * ALPHA;	337	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	338	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		339
249	ri.last = NOW;	340	ri.last = ev_now ();
250		341
251	double dif = ri.diff / ri.pcnt;	342	double dif = ri.diff / ri.pcnt;
252		343
253	bool send = dif > CUTOFF;	344	bool send = dif > NRL_CUTOFF;
254		345
255	if (dif > MAXDIF)	346	if (dif > NRL_MAXDIF)
256	{	347	{
257	ri.pcnt = 1.;	348	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	349	ri.diff = NRL_MAXDIF;
259	}	350	}
260	else if (send)	351	else if (send)
261	ri.pcnt++;	352	ri.pcnt++;
262		353
263	push_front (ri);	354	push_front (ri);
…		…
310	}	401	}
311		402
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	403	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	404	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		405
315	struct vpndata_packet:vpn_packet	406	struct vpndata_packet : vpn_packet
316	{	407	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno	408	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318		409
319	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	410	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
320	tap_packet unpack (connection conn, u32 &seqno);	411	tap_packet unpack (connection conn, u32 &seqno);
…		…
333	int outl = 0, outl2;	424	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	425	ptype type = PT_DATA_UNCOMPRESSED;
335		426
336	#if ENABLE_COMPRESSION	427	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	428	u8 cdata[MAX_MTU];
338	u32 cl;
339		429
		430	if (conn->features & FEATURE_COMPRESSION)
		431	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	432	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		433
341	if (cl)	434	if (cl)
342	{	435	{
343	type = PT_DATA_COMPRESSED;	436	type = PT_DATA_COMPRESSED;
344	d = cdata;	437	d = cdata;
345	l = cl + 2;	438	l = cl + 2;
346		439
347	d[0] = cl >> 8;	440	d[0] = cl >> 8;
348	d[1] = cl;	441	d[1] = cl;
		442	}
349	}	443	}
350	#endif	444	#endif
351		445
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	446	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
353		447
354	struct {	448	struct {
355	#if RAND_SIZE	449	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];	450	u8 rnd[RAND_SIZE];
357	#endif	451	#endif
…		…
361	datahdr.seqno = ntohl (seqno);	455	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE	456	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	457	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
364	#endif	458	#endif
365		459
366	EVP_EncryptUpdate (cctx,	460	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	461	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	462	(unsigned char *) &datahdr, DATAHDR));
369	outl += outl2;	463	outl += outl2;
370		464
371	EVP_EncryptUpdate (cctx,	465	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	466	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) d, l);	467	(unsigned char *) d, l));
374	outl += outl2;	468	outl += outl2;
375		469
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	470	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377	outl += outl2;	471	outl += outl2;
378		472
379	len = outl + data_hdr_size ();	473	len = outl + data_hdr_size ();
380		474
381	set_hdr (type, dst);	475	set_hdr (type, dst);
…		…
390	int outl = 0, outl2;	484	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	485	tap_packet *p = new tap_packet;
392	u8 *d;	486	u8 *d;
393	u32 l = len - data_hdr_size ();	487	u32 l = len - data_hdr_size ();
394		488
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	489	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
396		490
397	#if ENABLE_COMPRESSION	491	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	492	u8 cdata[MAX_MTU];
399		493
400	if (type == PT_DATA_COMPRESSED)	494	if (type == PT_DATA_COMPRESSED)
…		…
402	else	496	else
403	#endif	497	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	498	d = &(*p)[6 + 6 - DATAHDR];
405		499
406	/* this overwrites part of the src mac, but we fix that later */	500	/* this overwrites part of the src mac, but we fix that later */
407	EVP_DecryptUpdate (cctx,	501	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	502	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	503	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	504	outl += outl2;
411		505
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	506	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	507	outl += outl2;
414		508
415	seqno = ntohl ((u32 )(d + RAND_SIZE));	509	seqno = ntohl ((u32 )(d + RAND_SIZE));
416		510
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	511	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
446	{	540	{
447	// actually, hmaclen cannot be checked because the hmac	541	// actually, hmaclen cannot be checked because the hmac
448	// field comes before this data, so peers with other	542	// field comes before this data, so peers with other
449	// hmacs simply will not work.	543	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	544	u8 prot_major, prot_minor, randsize, hmaclen;
451	u8 flags, challengelen, pad2, pad3;	545	u8 flags, challengelen, features, pad3;
452	u32 cipher_nid, digest_nid, hmac_nid;	546	u32 cipher_nid, digest_nid, hmac_nid;
453
454	const u8 curflags () const
455	{
456	return 0x80
457	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}
459		547
460	void setup (ptype type, int dst);	548	void setup (ptype type, int dst);
461	bool chk_config () const;	549	bool chk_config () const;
		550
		551	static u8 get_features ()
		552	{
		553	u8 f = 0;
		554	#if ENABLE_COMPRESSION
		555	f \|= FEATURE_COMPRESSION;
		556	#endif
		557	#if ENABLE_ROHC
		558	f \|= FEATURE_ROHC;
		559	#endif
		560	#if ENABLE_BRIDGING
		561	f \|= FEATURE_BRIDGING;
		562	#endif
		563	return f;
		564	}
462	};	565	};
463		566
464	void config_packet::setup (ptype type, int dst)	567	void config_packet::setup (ptype type, int dst)
465	{	568	{
466	prot_major = PROTOCOL_MAJOR;	569	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	570	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	571	randsize = RAND_SIZE;
469	hmaclen = HMACLENGTH;	572	hmaclen = HMACLENGTH;
470	flags = curflags ();	573	flags = 0;
471	challengelen = sizeof (rsachallenge);	574	challengelen = sizeof (rsachallenge);
		575	features = get_features ();
472		576
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	577	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));	578	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	hmac_nid = htonl (EVP_MD_type (DIGEST));	579	hmac_nid = htonl (EVP_MD_type (DIGEST));
476		580
…		…
484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	588	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
485	else if (randsize != RAND_SIZE)	589	else if (randsize != RAND_SIZE)
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	590	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487	else if (hmaclen != HMACLENGTH)	591	else if (hmaclen != HMACLENGTH)
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);	592	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))	593	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));	594	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	595	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	596	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	597	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
…		…
504		606
505	struct auth_req_packet : config_packet	607	struct auth_req_packet : config_packet
506	{	608	{
507	char magic[8];	609	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	610	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will get patches on forward)	611	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	612	u8 pad2, pad3;
511	rsaid id;	613	rsaid id;
512	rsaencrdata encr;	614	rsaencrdata encr;
513		615
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	616	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	617	{
516	config_packet::setup (PT_AUTH_REQ, dst);	618	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	619	strncpy (magic, MAGIC_OLD, 8);
518	initiate = !!initiate_;	620	initiate = !!initiate_;
519	protocols = protocols_;	621	protocols = protocols_;
520		622
521	len = sizeof (*this) - sizeof (net_packet);	623	len = sizeof (*this) - sizeof (net_packet);
522	}	624	}
…		…
571	/////////////////////////////////////////////////////////////////////////////	673	/////////////////////////////////////////////////////////////////////////////
572		674
573	void	675	void
574	connection::connection_established ()	676	connection::connection_established ()
575	{	677	{
		678	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		679
576	if (ictx && octx)	680	if (ictx && octx)
577	{	681	{
578	connectmode = conf->connectmode;	682	// make sure rekeying timeouts are slightly asymmetric
579		683	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
580	rekey.start (NOW + ::conf.rekey);	684	rekey.start (rekey_interval, rekey_interval);
581	keepalive.start (NOW + ::conf.keepalive);	685	keepalive.start (::conf.keepalive);
582		686
583	// send queued packets	687	// send queued packets
584	if (ictx && octx)	688	if (ictx && octx)
585	{	689	{
586	while (tap_packet p = (tap_packet )data_queue.get ())	690	while (tap_packet p = (tap_packet )data_queue.get ())
587	{	691	{
588	send_data_packet (p);	692	if (p->len) send_data_packet (p);
589	delete p;	693	delete p;
590	}	694	}
591		695
592	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	696	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
593	{	697	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);	698	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;	699	delete p;
596	}	700	}
597	}	701	}
		702
		703	vpn->connection_established (this);
598	}	704	}
599	else	705	else
600	{	706	{
601	retry_cnt = 0;	707	retry_cnt = 0;
602	establish_connection.start (NOW + 5);	708	establish_connection.start (5);
603	keepalive.stop ();	709	keepalive.stop ();
604	rekey.stop ();	710	rekey.stop ();
605	}	711	}
606	}	712	}
607		713
608	void	714	void
609	connection::reset_si ()	715	connection::reset_si ()
610	{	716	{
		717	if (vpn->can_direct (THISNODE, conf))
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);	718	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
612		719	else
613	// mask out protocols we cannot establish	720	{
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	721	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	722	protocol = 0;
		723	}
616		724
617	si.set (conf, protocol);	725	si.set (conf, protocol);
		726
		727	is_direct = si.valid ();
618	}	728	}
619		729
620	// ensure sockinfo is valid, forward if necessary	730	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	731	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	732	connection::forward_si (const sockinfo &si) const
623	{	733	{
624	if (!si.valid ())	734	if (!si.valid ())
625	{	735	{
626	connection *r = vpn->find_router ();	736	connection *r = vpn->find_router_for (this);
627		737
628	if (r)	738	if (r)
629	{	739	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	740	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	741	conf->nodename, r->conf->nodename);
632	return r->si;	742	return r->si;
633	}	743	}
634	else	744	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	745	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	746	conf->nodename);
637	}	747	}
638		748
639	return si;	749	return si;
640	}	750	}
…		…
650	connection::send_ping (const sockinfo &si, u8 pong)	760	connection::send_ping (const sockinfo &si, u8 pong)
651	{	761	{
652	ping_packet *pkt = new ping_packet;	762	ping_packet *pkt = new ping_packet;
653		763
654	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	764	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		765
		766	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		767
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	768	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		769
657	delete pkt;	770	delete pkt;
658	}	771	}
659		772
…		…
678		791
679	rsachallenge chg;	792	rsachallenge chg;
680	rsa_cache.gen (pkt->id, chg);	793	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	794	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
682		795
683	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	796	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
684		797
685	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	798	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
686		799
687	delete pkt;	800	delete pkt;
688	}	801	}
…		…
696		809
697	rsa_hash (id, chg, pkt->response);	810	rsa_hash (id, chg, pkt->response);
698		811
699	pkt->hmac_set (octx);	812	pkt->hmac_set (octx);
700		813
701	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	814	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
702		815
703	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	816	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704		817
705	delete pkt;	818	delete pkt;
706	}	819	}
707		820
708	void	821	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	822	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	823	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	824	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	825	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
713		826
714	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	827	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715		828
716	r->hmac_set (octx);	829	r->hmac_set (octx);
717	send_vpn_packet (r, si);	830	send_vpn_packet (r, si);
718		831
719	delete r;	832	delete r;
720	}	833	}
721		834
722	void	835	inline void
723	connection::establish_connection_cb (time_watcher &w)	836	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	837	{
725	if (!ictx	838	if (!ictx
726	&& conf != THISNODE	839	&& conf != THISNODE
727	&& connectmode != conf_node::C_NEVER	840	&& connectmode != conf_node::C_NEVER
728	&& connectmode != conf_node::C_DISABLED	841	&& connectmode != conf_node::C_DISABLED
729	&& w.at <= NOW)	842	&& !w.is_active ())
730	{	843	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	844	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732		845	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	846	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		847	{
		848	reset_connection ();
734	retry_cnt++;	849	return;
		850	}
735		851
736	w.start (NOW + retry_int);	852	last_establish_attempt = ev_now ();
		853
		854	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		855	? (retry_cnt & 3) + 1
		856	: 1 << (retry_cnt >> 2));
737		857
738	reset_si ();	858	reset_si ();
739		859
740	if (si.prot && !si.host)	860	bool slow = si.prot & PROT_SLOW;
		861
		862	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		863	{
		864	/TODO/ /* start the timer so we don't recurse endlessly */
		865	w.start (1);
741	vpn->send_connect_request (conf->id);	866	vpn->send_connect_request (this);
		867	}
742	else	868	else
743	{	869	{
		870	if (si.valid ())
		871	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		872	conf->nodename, (const char *)si);
		873
744	const sockinfo &dsi = forward_si (si);	874	const sockinfo &dsi = forward_si (si);
		875
		876	slow = slow \|\| (dsi.prot & PROT_SLOW);
745		877
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	878	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	879	{
748	if (retry_cnt < 4)	880	if (retry_cnt < 4)
749	send_auth_request (dsi, true);	881	send_auth_request (dsi, true);
750	else	882	else
751	send_ping (dsi, 0);	883	send_ping (dsi, 0);
752	}	884	}
753	}	885	}
		886
		887	retry_int *= slow ? 8. : 0.9;
		888
		889	if (retry_int < conf->max_retry)
		890	retry_cnt++;
		891	else
		892	retry_int = conf->max_retry;
		893
		894	w.start (retry_int);
754	}	895	}
755	}	896	}
756		897
757	void	898	void
758	connection::reset_connection ()	899	connection::reset_connection ()
…		…
761	{	902	{
762	slog (L_INFO, _("%s(%s): connection lost"),	903	slog (L_INFO, _("%s(%s): connection lost"),
763	conf->nodename, (const char *)si);	904	conf->nodename, (const char *)si);
764		905
765	if (::conf.script_node_down)	906	if (::conf.script_node_down)
766	run_script (run_script_cb (this, &connection::script_node_down), false);	907	{
		908	run_script_cb *cb = new run_script_cb;
		909	cb->set<connection, &connection::script_node_down> (this);
		910	run_script_queued (cb, _("node-down command execution failed, continuing."));
		911	}
767	}	912	}
768		913
769	delete ictx; ictx = 0;	914	delete ictx; ictx = 0;
770	delete octx; octx = 0;	915	delete octx; octx = 0;
		916	#if ENABLE_DNS
		917	dnsv4_reset_connection ();
		918	#endif
771		919
772	si.host= 0;	920	si.host = 0;
773		921
774	last_activity = 0;	922	last_activity = 0.;
		923	//last_si_change = 0.;
775	retry_cnt = 0;	924	retry_cnt = 0;
776		925
777	rekey.stop ();	926	rekey.stop ();
778	keepalive.stop ();	927	keepalive.stop ();
779	establish_connection.stop ();	928	establish_connection.stop ();
…		…
786	send_reset (si);	935	send_reset (si);
787		936
788	reset_connection ();	937	reset_connection ();
789	}	938	}
790		939
791	void	940	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	941	inline void
		942	connection::rekey_cb (ev::timer &w, int revents)
793	{	943	{
794	reset_connection ();	944	reset_connection ();
795	establish_connection ();	945	establish_connection ();
796	}	946	}
797		947
…		…
813	if (oseqno > MAX_SEQNO)	963	if (oseqno > MAX_SEQNO)
814	rekey ();	964	rekey ();
815	}	965	}
816		966
817	void	967	void
		968	connection::post_inject_queue ()
		969	{
		970	// force a connection every now and when when packets are sent (max 1/s)
		971	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		972	establish_connection.stop ();
		973
		974	establish_connection ();
		975	}
		976
		977	void
818	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	978	connection::inject_data_packet (tap_packet *pkt)
819	{	979	{
820	if (ictx && octx)	980	if (ictx && octx)
821	send_data_packet (pkt);	981	send_data_packet (pkt);
822	else	982	else
823	{	983	{
824	if (!broadcast)//DDDD
825	data_queue.put (new tap_packet (*pkt));	984	data_queue.put (new tap_packet (*pkt));
826		985	post_inject_queue ();
827	establish_connection ();
828	}	986	}
829	}	987	}
830		988
831	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	989	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832	{	990	{
833	if (ictx && octx)	991	if (ictx && octx)
834	send_vpn_packet (pkt, si, tos);	992	send_vpn_packet (pkt, si, tos);
835	else	993	else
836	{	994	{
837	vpn_queue.put (new vpn_packet (*pkt));	995	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
838		996	post_inject_queue ();
839	establish_connection ();
840	}	997	}
841	}	998	}
842		999
843	void	1000	void
844	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1001	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
845	{	1002	{
846	last_activity = NOW;	1003	last_activity = ev_now ();
847		1004
848	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1005	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
849	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1006	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1007
		1008	if (connectmode == conf_node::C_DISABLED)
		1009	return;
850		1010
851	switch (pkt->typ ())	1011	switch (pkt->typ ())
852	{	1012	{
853	case vpn_packet::PT_PING:	1013	case vpn_packet::PT_PING:
		1014	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1015
854	// we send pings instead of auth packets after some retries,	1016	// we send pings instead of auth packets after some retries,
855	// so reset the retry counter and establish a connection	1017	// so reset the retry counter and establish a connection
856	// when we receive a ping.	1018	// when we receive a ping.
857	if (!ictx)	1019	if (!(ictx && octx))
858	{	1020	{
859	if (auth_rate_limiter.can (rsi))	1021	if (auth_rate_limiter.can (rsi))
860	send_auth_request (rsi, true);	1022	send_auth_request (rsi, true);
861	}	1023	}
862	else	1024	else
		1025	// we would love to change thre socket address here, but ping's aren't
		1026	// authenticated, so we best ignore it.
863	send_ping (rsi, 1); // pong	1027	send_ping (rsi, 1); // pong
864		1028
865	break;	1029	break;
866		1030
867	case vpn_packet::PT_PONG:	1031	case vpn_packet::PT_PONG:
		1032	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
868	break;	1033	break;
869		1034
870	case vpn_packet::PT_RESET:	1035	case vpn_packet::PT_RESET:
871	{	1036	{
872	reset_connection ();	1037	reset_connection ();
873		1038
874	config_packet p = (config_packet ) pkt;	1039	config_packet p = (config_packet ) pkt;
875		1040
876	if (!p->chk_config ())	1041	if (!p->chk_config ())
877	{	1042	{
878	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1043	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
879	conf->nodename, (const char *)rsi);	1044	conf->nodename, (const char *)rsi);
880	connectmode = conf_node::C_DISABLED;	1045	connectmode = conf_node::C_DISABLED;
881	}	1046	}
882	else if (connectmode == conf_node::C_ALWAYS)	1047	else if (connectmode == conf_node::C_ALWAYS)
883	establish_connection ();	1048	establish_connection ();
…		…
887	case vpn_packet::PT_AUTH_REQ:	1052	case vpn_packet::PT_AUTH_REQ:
888	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
889	{	1054	{
890	auth_req_packet p = (auth_req_packet ) pkt;	1055	auth_req_packet p = (auth_req_packet ) pkt;
891		1056
892	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1057	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
893		1058
894	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1059	if (p->chk_config ()
		1060	&& (!strncmp (p->magic, MAGIC_OLD, 8) \|\| !strncmp (p->magic, MAGIC, 8)))
895	{	1061	{
896	if (p->prot_minor != PROTOCOL_MINOR)	1062	if (p->prot_minor != PROTOCOL_MINOR)
897	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1063	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
898	conf->nodename, (const char *)rsi,	1064	conf->nodename, (const char *)rsi,
899	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1065	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
915		1081
916	octx = new crypto_ctx (k, 1);	1082	octx = new crypto_ctx (k, 1);
917	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1083	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
918		1084
919	conf->protocols = p->protocols;	1085	conf->protocols = p->protocols;
		1086	features = p->features & config_packet::get_features ();
920		1087
921	send_auth_response (rsi, p->id, k);	1088	send_auth_response (rsi, p->id, k);
922		1089
923	connection_established ();	1090	connection_established ();
924		1091
925	break;	1092	break;
926	}	1093	}
927	}	1094	}
928	else	1095	else
929	slog (L_WARN, _("%s(%s): protocol mismatch"),	1096	slog (L_WARN, _("%s(%s): protocol mismatch."),
930	conf->nodename, (const char *)rsi);	1097	conf->nodename, (const char *)rsi);
931		1098
932	send_reset (rsi);	1099	send_reset (rsi);
933	}	1100	}
934		1101
935	break;	1102	break;
936		1103
937	case vpn_packet::PT_AUTH_RES:	1104	case vpn_packet::PT_AUTH_RES:
938	{	1105	{
939	auth_res_packet p = (auth_res_packet ) pkt;	1106	auth_res_packet p = (auth_res_packet )pkt;
940		1107
941	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1108	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
942		1109
943	if (p->chk_config ())	1110	if (p->chk_config ())
944	{	1111	{
945	if (p->prot_minor != PROTOCOL_MINOR)	1112	if (p->prot_minor != PROTOCOL_MINOR)
946	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1113	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
949		1116
950	rsachallenge chg;	1117	rsachallenge chg;
951		1118
952	if (!rsa_cache.find (p->id, chg))	1119	if (!rsa_cache.find (p->id, chg))
953	{	1120	{
954	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1121	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
955	conf->nodename, (const char *)rsi);	1122	conf->nodename, (const char *)rsi);
956	break;	1123	break;
957	}	1124	}
958	else	1125	else
959	{	1126	{
960	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1127	crypto_ctx *cctx = new crypto_ctx (chg, 0);
961		1128
962	if (!p->hmac_chk (cctx))	1129	if (!p->hmac_chk (cctx))
963	{	1130	{
964	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1131	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
965	"could be an attack, or just corruption or an synchronization error"),	1132	"could be an attack, or just corruption or a synchronization error."),
966	conf->nodename, (const char *)rsi);	1133	conf->nodename, (const char *)rsi);
967	break;	1134	break;
968	}	1135	}
969	else	1136	else
970	{	1137	{
…		…
981	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1148	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
982		1149
983	si = rsi;	1150	si = rsi;
984	protocol = rsi.prot;	1151	protocol = rsi.prot;
985		1152
		1153	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		1154	conf->nodename, (const char *)rsi,
		1155	is_direct ? "direct" : "forwarded",
		1156	p->prot_major, p->prot_minor);
		1157
986	connection_established ();	1158	connection_established ();
987		1159
988	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
989	conf->nodename, (const char *)rsi,
990	p->prot_major, p->prot_minor);
991
992	if (::conf.script_node_up)	1160	if (::conf.script_node_up)
993	run_script (run_script_cb (this, &connection::script_node_up), false);	1161	{
		1162	run_script_cb *cb = new run_script_cb;
		1163	cb->set<connection, &connection::script_node_up> (this);
		1164	run_script_queued (cb, _("node-up command execution failed, continuing."));
		1165	}
994		1166
995	break;	1167	break;
996	}	1168	}
997	else	1169	else
998	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1170	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
999	conf->nodename, (const char *)rsi);	1171	conf->nodename, (const char *)rsi);
1000	}	1172	}
1001		1173
1002	delete cctx;	1174	delete cctx;
1003	}	1175	}
…		…
1019	{	1191	{
1020	vpndata_packet p = (vpndata_packet )pkt;	1192	vpndata_packet p = (vpndata_packet )pkt;
1021		1193
1022	if (!p->hmac_chk (ictx))	1194	if (!p->hmac_chk (ictx))
1023	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1195	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1024	"could be an attack, or just corruption or an synchronization error"),	1196	"could be an attack, or just corruption or a synchronization error."),
1025	conf->nodename, (const char *)rsi);	1197	conf->nodename, (const char *)rsi);
1026	else	1198	else
1027	{	1199	{
1028	u32 seqno;	1200	u32 seqno;
1029	tap_packet *d = p->unpack (this, seqno);	1201	tap_packet *d = p->unpack (this, seqno);
		1202	int seqclass = iseqno.seqno_classify (seqno);
1030		1203
1031	if (iseqno.recv_ok (seqno))	1204	if (seqclass == 0) // ok
1032	{	1205	{
1033	vpn->tap->send (d);	1206	vpn->tap->send (d);
1034		1207
1035	if (si != rsi)	1208	if (si != rsi)
1036	{	1209	{
1037	// fast re-sync on connection changes, useful especially for tcp/ip	1210	// fast re-sync on source address changes, useful especially for tcp/ip
		1211	//if (last_si_change < ev_now () + 5.)
1038	si = rsi;	1212	// {
1039
1040	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1213	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1041	conf->nodename, (const char )si, (const char )rsi);	1214	conf->nodename, (const char )si, (const char )rsi);
		1215
		1216	si = rsi;
		1217
		1218	if (::conf.script_node_change)
		1219	{
		1220	run_script_cb *cb = new run_script_cb;
		1221	cb->set<connection, &connection::script_node_change> (this);
		1222	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1223	}
		1224
		1225	// }
		1226	//else
		1227	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1228	// conf->nodename, (const char )si, (const char )rsi);
1042	}	1229	}
1043
1044	delete d;
1045
1046	break;
1047	}	1230	}
		1231	else if (seqclass == 1) // far history
		1232	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1233	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1234	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1235	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1236	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1237	else if (seqclass == 3) // reset
		1238	{
		1239	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1240	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1241	send_reset (rsi);
		1242	}
		1243
		1244	delete d;
		1245	break;
1048	}	1246	}
1049	}	1247	}
1050		1248
1051	send_reset (rsi);	1249	send_reset (rsi);
1052	break;	1250	break;
1053		1251
1054	case vpn_packet::PT_CONNECT_REQ:	1252	case vpn_packet::PT_CONNECT_REQ:
1055	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1253	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1056	{	1254	{
1057	connect_req_packet p = (connect_req_packet ) pkt;	1255	connect_req_packet p = (connect_req_packet )pkt;
1058		1256
1059	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1257	if (p->id > 0 && p->id <= vpn->conns.size ())
1060	connection *c = vpn->conns[p->id - 1];
1061	conf->protocols = p->protocols;
1062
1063	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1064	conf->id, p->id, c->ictx && c->octx);
1065
1066	if (c->ictx && c->octx)
1067	{	1258	{
		1259	connection *c = vpn->conns[p->id - 1];
		1260	conf->protocols = p->protocols;
		1261
		1262	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
		1263	conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
		1264
		1265	if (c->ictx && c->octx)
		1266	{
1068	// send connect_info packets to both sides, in case one is	1267	// send connect_info packets to both sides, in case one is
1069	// behind a nat firewall (or both ;)	1268	// behind a nat firewall (or both ;)
1070	c->send_connect_info (conf->id, si, conf->protocols);	1269	c->send_connect_info (conf->id, si, conf->protocols);
1071	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1270	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1271	}
		1272	else
		1273	c->establish_connection ();
1072	}	1274	}
1073	else	1275	else
1074	c->establish_connection ();	1276	slog (L_WARN,
		1277	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1278	p->id);
1075	}	1279	}
1076		1280
1077	break;	1281	break;
1078		1282
1079	case vpn_packet::PT_CONNECT_INFO:	1283	case vpn_packet::PT_CONNECT_INFO:
1080	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1284	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1081	{	1285	{
1082	connect_info_packet p = (connect_info_packet ) pkt;	1286	connect_info_packet p = (connect_info_packet )pkt;
1083		1287
1084	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1288	if (p->id > 0 && p->id <= vpn->conns.size ())
1085		1289	{
1086	connection *c = vpn->conns[p->id - 1];	1290	connection *c = vpn->conns[p->id - 1];
1087		1291
1088	c->conf->protocols = p->protocols;	1292	c->conf->protocols = p->protocols;
1089	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1293	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1090	p->si.upgrade_protocol (protocol, c->conf);	1294	p->si.upgrade_protocol (protocol, c->conf);
1091		1295
1092	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1296	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
		1297	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1093	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1298	(const char *)p->si, !c->ictx && !c->octx);
1094		1299
1095	const sockinfo &dsi = forward_si (p->si);	1300	const sockinfo &dsi = forward_si (p->si);
1096		1301
1097	if (dsi.valid ())	1302	if (dsi.valid ())
1098	c->send_auth_request (dsi, true);	1303	c->send_auth_request (dsi, true);
		1304	}
		1305	else
		1306	slog (L_WARN,
		1307	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1308	p->id);
1099	}	1309	}
1100		1310
1101	break;	1311	break;
1102		1312
1103	default:	1313	default:
1104	send_reset (rsi);	1314	send_reset (rsi);
1105	break;	1315	break;
1106	}	1316	}
1107	}	1317	}
1108		1318
1109	void connection::keepalive_cb (time_watcher &w)	1319	inline void
		1320	connection::keepalive_cb (ev::timer &w, int revents)
1110	{	1321	{
1111	if (NOW >= last_activity + ::conf.keepalive + 30)	1322	if (ev_now () >= last_activity + ::conf.keepalive + 15)
1112	{	1323	{
1113	reset_connection ();	1324	reset_connection ();
1114	establish_connection ();	1325	establish_connection ();
1115	}	1326	}
1116	else if (NOW < last_activity + ::conf.keepalive)	1327	else if (ev_now () < last_activity + ::conf.keepalive)
1117	w.start (last_activity + ::conf.keepalive);	1328	w.start (last_activity + ::conf.keepalive - ev::now ());
1118	else if (conf->connectmode != conf_node::C_ONDEMAND	1329	else if (conf->connectmode != conf_node::C_ONDEMAND
1119	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1330	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1120	{	1331	{
1121	send_ping (si);	1332	send_ping (si);
1122	w.start (NOW + 5);	1333	w.start (3);
1123	}	1334	}
1124	else if (NOW < last_activity + ::conf.keepalive + 10)	1335	else if (ev_now () < last_activity + ::conf.keepalive + 10)
1125	// hold ondemand connections implicitly a few seconds longer	1336	// hold ondemand connections implicitly a few seconds longer
1126	// should delete octx, though, or something like that ;)	1337	// should delete octx, though, or something like that ;)
1127	w.start (last_activity + ::conf.keepalive + 10);	1338	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1128	else	1339	else
1129	reset_connection ();	1340	reset_connection ();
1130	}	1341	}
1131		1342
1132	void connection::send_connect_request (int id)	1343	void connection::send_connect_request (int id)
1133	{	1344	{
1134	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1345	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1135		1346
1136	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1347	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
		1348	conf->nodename, vpn->conns[id - 1]->conf->nodename);
1137	p->hmac_set (octx);	1349	p->hmac_set (octx);
1138	send_vpn_packet (p, si);	1350	send_vpn_packet (p, si);
1139		1351
1140	delete p;	1352	delete p;
1141	}	1353	}
1142		1354
1143	void connection::script_node ()	1355	void connection::script_init_env (const char *ext)
1144	{	1356	{
1145	vpn->script_if_up ();
1146
1147	char *env;	1357	char *env;
		1358	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1359	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1360	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1361	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1362	conf->id & 0xff); putenv (env);
		1363	}
		1364
		1365	void connection::script_init_connect_env ()
		1366	{
		1367	vpn->script_init_env ();
		1368
		1369	char *env;
1148	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1370	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1371	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1149	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1372	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1150	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1373	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1151	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1374	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1152	}	1375	}
1153		1376
		1377	inline const char *
1154	const char *connection::script_node_up ()	1378	connection::script_node_up ()
1155	{	1379	{
1156	script_node ();	1380	script_init_connect_env ();
1157		1381
1158	putenv ("STATE=up");	1382	putenv ((char *)"STATE=up");
1159		1383
		1384	char *filename;
		1385	asprintf (&filename,
		1386	"%s/%s",
		1387	confbase,
1160	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1388	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1161	}
1162		1389
		1390	return filename;
		1391	}
		1392
		1393	inline const char *
		1394	connection::script_node_change ()
		1395	{
		1396	script_init_connect_env ();
		1397
		1398	putenv ((char *)"STATE=change");
		1399
		1400	char *filename;
		1401	asprintf (&filename,
		1402	"%s/%s",
		1403	confbase,
		1404	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1405
		1406	return filename;
		1407	}
		1408
		1409	inline const char *
1163	const char *connection::script_node_down ()	1410	connection::script_node_down ()
1164	{	1411	{
1165	script_node ();	1412	script_init_connect_env ();
1166		1413
1167	putenv ("STATE=down");	1414	putenv ((char *)"STATE=down");
1168		1415
1169	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1416	char *filename;
1170	}	1417	asprintf (&filename,
		1418	"%s/%s",
		1419	confbase,
		1420	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1171		1421
		1422	return filename;
		1423	}
		1424
1172	connection::connection(struct vpn *vpn_)	1425	connection::connection (struct vpn vpn, conf_node conf)
1173	: vpn(vpn_)	1426	: vpn(vpn), conf(conf),
1174	, rekey (this, &connection::rekey_cb)	1427	#if ENABLE_DNS
1175	, keepalive (this, &connection::keepalive_cb)	1428	dns (0),
		1429	#endif
		1430	data_queue(conf->max_ttl, conf->max_queue + 1),
		1431	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1432	{
		1433	rekey .set<connection, &connection::rekey_cb > (this);
		1434	keepalive .set<connection, &connection::keepalive_cb > (this);
1176	, establish_connection (this, &connection::establish_connection_cb)	1435	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1177	{	1436
		1437	last_establish_attempt = 0.;
1178	octx = ictx = 0;	1438	octx = ictx = 0;
1179	retry_cnt = 0;
1180		1439
1181	connectmode = conf_node::C_ALWAYS; // initial setting	1440	if (!conf->protocols) // make sure some protocol is enabled
		1441	conf->protocols = PROT_UDPv4;
		1442
		1443	connectmode = conf->connectmode;
		1444
		1445	// queue a dummy packet to force an initial connection attempt
		1446	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1447	vpn_queue.put (new net_packet);
		1448
1182	reset_connection ();	1449	reset_connection ();
1183	}	1450	}
1184		1451
1185	connection::~connection ()	1452	connection::~connection ()
1186	{	1453	{

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/connection.C (file contents): Revision 1.25 by pcg, Sat Jan 17 01:18:36 2004 UTC vs. Revision 1.88 by root, Thu Dec 2 07:15:14 2010 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.25 by pcg, Sat Jan 17 01:18:36 2004 UTC vs.
Revision 1.88 by root, Thu Dec 2 07:15:14 2010 UTC