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

Comparing gvpe/src/connection.C (file contents):
Revision 1.26 by pcg, Sat Jan 17 14:08:57 2004 UTC vs.
Revision 1.97 by root, Tue Dec 4 13:23:17 2012 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) 2003-2008,2010,2011 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	namespace
		70	{
		71	void // c++ requires external linkage here, apparently :(
		72	rs_child_cb (ev::child &w, int revents)
		73	{
		74	w.stop ();
		75
		76	if (rs_queue.empty ())
		77	return;
		78
		79	pid_t pid = run_script (*rs_queue.front ().first, false);
		80	if (pid)
		81	{
		82	w.set (pid);
		83	w.start ();
		84	}
		85	else
		86	slog (L_WARN, rs_queue.front ().second);
		87
		88	delete rs_queue.front ().first;
		89	rs_queue.pop ();
		90	}
		91	};
		92
		93	// despite the fancy name, this is quite a hack
		94	static void
		95	run_script_queued (run_script_cb cb, const char warnmsg)
		96	{
		97	rs_queue.push (std::make_pair (cb, warnmsg));
		98
		99	if (!rs_child_ev.is_active ())
		100	{
		101	rs_child_ev.set<rs_child_cb> ();
		102	rs_child_ev ();
		103	}
		104	}
		105
		106	//////////////////////////////////////////////////////////////////////////////
50		107
51	struct crypto_ctx	108	struct crypto_ctx
52	{	109	{
53	EVP_CIPHER_CTX cctx;	110	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	111	HMAC_CTX hctx;
…		…
58	};	115	};
59		116
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	117	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
61	{	118	{
62	EVP_CIPHER_CTX_init (&cctx);	119	EVP_CIPHER_CTX_init (&cctx);
63	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	120	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
64	HMAC_CTX_init (&hctx);	121	HMAC_CTX_init (&hctx);
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	122	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	123	}
67		124
68	crypto_ctx::~crypto_ctx ()	125	crypto_ctx::~crypto_ctx ()
69	{	126	{
70	EVP_CIPHER_CTX_cleanup (&cctx);	127	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	128	HMAC_CTX_cleanup (&hctx);
72	}	129	}
73		130
74	static void	131	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	132	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
76	{	133	{
77	EVP_MD_CTX ctx;	134	EVP_MD_CTX ctx;
78		135
79	EVP_MD_CTX_init (&ctx);	136	EVP_MD_CTX_init (&ctx);
80	EVP_DigestInit (&ctx, RSA_HASH);	137	require (EVP_DigestInit (&ctx, RSA_HASH));
81	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	138	require (EVP_DigestUpdate (&ctx, &chg, sizeof chg));
82	EVP_DigestUpdate(&ctx, &id, sizeof id);	139	require (EVP_DigestUpdate (&ctx, &id, sizeof id));
83	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	140	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);	141	EVP_MD_CTX_cleanup (&ctx);
85	}	142	}
86		143
87	struct rsa_entry {	144	struct rsa_entry
		145	{
88	tstamp expire;	146	tstamp expire;
89	rsaid id;	147	rsaid id;
90	rsachallenge chg;	148	rsachallenge chg;
91	};	149	};
92		150
93	struct rsa_cache : list<rsa_entry>	151	struct rsa_cache : list<rsa_entry>
94	{	152	{
95	void cleaner_cb (time_watcher &w); time_watcher cleaner;	153	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
96		154
97	bool find (const rsaid &id, rsachallenge &chg)	155	bool find (const rsaid &id, rsachallenge &chg)
98	{	156	{
99	for (iterator i = begin (); i != end (); ++i)	157	for (iterator i = begin (); i != end (); ++i)
100	{	158	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	159	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
102	{	160	{
103	memcpy (&chg, &i->chg, sizeof chg);	161	memcpy (&chg, &i->chg, sizeof chg);
104		162
105	erase (i);	163	erase (i);
106	return true;	164	return true;
107	}	165	}
108	}	166	}
109		167
110	if (cleaner.at < NOW)	168	if (!cleaner.is_active ())
111	cleaner.start (NOW + RSA_TTL);	169	cleaner.again ();
112		170
113	return false;	171	return false;
114	}	172	}
115		173
116	void gen (rsaid &id, rsachallenge &chg)	174	void gen (rsaid &id, rsachallenge &chg)
117	{	175	{
118	rsa_entry e;	176	rsa_entry e;
119		177
120	RAND_bytes ((unsigned char *)&id, sizeof id);	178	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);	179	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122		180
123	e.expire = NOW + RSA_TTL;	181	e.expire = ev_now () + RSA_TTL;
124	e.id = id;	182	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);	183	memcpy (&e.chg, &chg, sizeof chg);
126		184
127	push_back (e);	185	push_back (e);
128		186
129	if (cleaner.at < NOW)	187	if (!cleaner.is_active ())
130	cleaner.start (NOW + RSA_TTL);	188	cleaner.again ();
131	}	189	}
132		190
133	rsa_cache ()	191	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)	192	{
135	{ }	193	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
		194	cleaner.set (RSA_TTL, RSA_TTL);
		195	}
136		196
137	} rsa_cache;	197	} rsa_cache;
138		198
139	void rsa_cache::cleaner_cb (time_watcher &w)	199	void
		200	rsa_cache::cleaner_cb (ev::timer &w, int revents)
140	{	201	{
141	if (!empty ())	202	if (empty ())
		203	w.stop ();
		204	else
142	{	205	{
143	w.start (NOW + RSA_TTL);
144
145	for (iterator i = begin (); i != end (); )	206	for (iterator i = begin (); i != end (); )
146	if (i->expire <= NOW)	207	if (i->expire <= ev_now ())
147	i = erase (i);	208	i = erase (i);
148	else	209	else
149	++i;	210	++i;
150	}	211	}
151	}	212	}
152		213
153	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
154		215
155	void pkt_queue::put (net_packet *p)	216	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		217	: max_ttl (max_ttl), max_queue (max_queue)
156	{	218	{
157	if (queue[i])	219	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		220
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;	221	i = 0;
185	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	225	}
187		226
188	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
189	{	228	{
190	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
191	delete queue[i];	232	delete [] queue;
192	}	233	}
193		234
		235	void
		236	pkt_queue::expire_cb (ev::timer &w, int revents)
		237	{
		238	ev_tstamp expire = ev_now () - max_ttl;
		239
		240	for (;;)
		241	{
		242	if (empty ())
		243	break;
		244
		245	double diff = queue[j].tstamp - expire;
		246
		247	if (diff >= 0.)
		248	{
		249	w.start (diff > 0.5 ? diff : 0.5);
		250	break;
		251	}
		252
		253	delete get ();
		254	}
		255	}
		256
		257	void
		258	pkt_queue::put (net_packet *p)
		259	{
		260	ev_tstamp now = ev_now ();
		261
		262	// start expiry timer
		263	if (empty ())
		264	expire.start (max_ttl);
		265
		266	int ni = i + 1 == max_queue ? 0 : i + 1;
		267
		268	if (ni == j)
		269	delete get ();
		270
		271	queue[i].pkt = p;
		272	queue[i].tstamp = now;
		273
		274	i = ni;
		275	}
		276
		277	net_packet *
		278	pkt_queue::get ()
		279	{
		280	if (empty ())
		281	return 0;
		282
		283	net_packet *p = queue[j].pkt;
		284	queue[j].pkt = 0;
		285
		286	j = j + 1 == max_queue ? 0 : j + 1;
		287
		288	return p;
		289	}
		290
194	struct net_rateinfo {	291	struct net_rateinfo
		292	{
195	u32 host;	293	u32 host;
196	double pcnt, diff;	294	double pcnt, diff;
197	tstamp last;	295	tstamp last;
198	};	296	};
199		297
200	// only do action once every x seconds per host whole allowing bursts.	298	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	299	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	300	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	301	struct net_rate_limiter : list<net_rateinfo>
204	{	302	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	303	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	304	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	305	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	306	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		307
210	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	309	bool can (u32 host);
212	};	310	};
213		311
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		313
		314	bool
216	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
217	{	316	{
218	iterator i;	317	iterator i;
219		318
220	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
221	if (i->host == host)	320	if (i->host == host)
222	break;	321	break;
223	else if (i->last < NOW - EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	323	i = erase (i);
225	else	324	else
226	i++;	325	i++;
227		326
228	if (i == end ())	327	if (i == end ())
229	{	328	{
230	net_rateinfo ri;	329	net_rateinfo ri;
231		330
232	ri.host = host;	331	ri.host = host;
233	ri.pcnt = 1.;	332	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	333	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	334	ri.last = ev_now ();
236		335
237	push_front (ri);	336	push_front (ri);
238		337
239	return true;	338	return true;
240	}	339	}
241	else	340	else
242	{	341	{
243	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
244	erase (i);	343	erase (i);
245		344
246	ri.pcnt = ri.pcnt * ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		347
249	ri.last = NOW;	348	ri.last = ev_now ();
250		349
251	double dif = ri.diff / ri.pcnt;	350	double dif = ri.diff / ri.pcnt;
252		351
253	bool send = dif > CUTOFF;	352	bool send = dif > NRL_CUTOFF;
254		353
255	if (dif > MAXDIF)	354	if (dif > NRL_MAXDIF)
256	{	355	{
257	ri.pcnt = 1.;	356	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	357	ri.diff = NRL_MAXDIF;
259	}	358	}
260	else if (send)	359	else if (send)
261	ri.pcnt++;	360	ri.pcnt++;
262		361
263	push_front (ri);	362	push_front (ri);
…		…
268		367
269	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
270		369
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
272		371
		372	void
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
274	{	374	{
275	unsigned int xlen;	375	unsigned int xlen;
276		376
277	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
278		378
…		…
296	hmac_gen (ctx);	396	hmac_gen (ctx);
297		397
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
299	}	399	}
300		400
		401	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	403	{
303	type = type_;	404	type = type_;
304		405
305	int src = THISNODE->id;	406	int src = THISNODE->id;
306		407
…		…
310	}	411	}
311		412
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		415
315	struct vpndata_packet:vpn_packet	416	struct vpndata_packet : vpn_packet
		417	{
		418	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		419
		420	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		421	tap_packet unpack (connection conn, u32 &seqno);
		422
		423	private:
		424	const u32 data_hdr_size () const
316	{	425	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318
319	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
320	tap_packet unpack (connection conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	427	}
		428	};
328		429
329	void	430	void
330	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	431	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
331	{	432	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
333	int outl = 0, outl2;	434	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
335		436
336	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
338	u32 cl;
339		439
		440	if (conn->features & FEATURE_COMPRESSION)
		441	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		443
341	if (cl)	444	if (cl)
342	{	445	{
343	type = PT_DATA_COMPRESSED;	446	type = PT_DATA_COMPRESSED;
344	d = cdata;	447	d = cdata;
345	l = cl + 2;	448	l = cl + 2;
346		449
347	d[0] = cl >> 8;	450	d[0] = cl >> 8;
348	d[1] = cl;	451	d[1] = cl;
		452	}
349	}	453	}
350	#endif	454	#endif
351		455
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	456	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
353		457
354	struct {	458	struct {
355	#if RAND_SIZE	459	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];	460	u8 rnd[RAND_SIZE];
357	#endif	461	#endif
…		…
361	datahdr.seqno = ntohl (seqno);	465	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE	466	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	467	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
364	#endif	468	#endif
365		469
366	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
369	outl += outl2;	473	outl += outl2;
370		474
371	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) d, l);	477	(unsigned char *) d, l));
374	outl += outl2;	478	outl += outl2;
375		479
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377	outl += outl2;	481	outl += outl2;
378		482
379	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
380		484
381	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
390	int outl = 0, outl2;	494	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
392	u8 *d;	496	u8 *d;
393	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
394		498
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
396		500
397	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
399		503
400	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
…		…
402	else	506	else
403	#endif	507	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6 - DATAHDR];
405		509
406	/* this overwrites part of the src mac, but we fix that later */	510	/* this overwrites part of the src mac, but we fix that later */
407	EVP_DecryptUpdate (cctx,	511	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	512	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	513	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	514	outl += outl2;
411		515
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	516	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	517	outl += outl2;
414		518
415	seqno = ntohl ((u32 )(d + RAND_SIZE));	519	seqno = ntohl ((u32 )(d + RAND_SIZE));
416		520
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	521	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
446	{	550	{
447	// actually, hmaclen cannot be checked because the hmac	551	// actually, hmaclen cannot be checked because the hmac
448	// field comes before this data, so peers with other	552	// field comes before this data, so peers with other
449	// hmacs simply will not work.	553	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	554	u8 prot_major, prot_minor, randsize, hmaclen;
451	u8 flags, challengelen, pad2, pad3;	555	u8 flags, challengelen, features, pad3;
452	u32 cipher_nid, digest_nid, hmac_nid;	556	u32 cipher_nid, digest_nid, hmac_nid;
453
454	const u8 curflags () const
455	{
456	return 0x80
457	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}
459		557
460	void setup (ptype type, int dst);	558	void setup (ptype type, int dst);
461	bool chk_config () const;	559	bool chk_config () const;
		560
		561	static u8 get_features ()
		562	{
		563	u8 f = 0;
		564	#if ENABLE_COMPRESSION
		565	f \|= FEATURE_COMPRESSION;
		566	#endif
		567	#if ENABLE_ROHC
		568	f \|= FEATURE_ROHC;
		569	#endif
		570	#if ENABLE_BRIDGING
		571	f \|= FEATURE_BRIDGING;
		572	#endif
		573	return f;
		574	}
462	};	575	};
463		576
		577	void
464	void config_packet::setup (ptype type, int dst)	578	config_packet::setup (ptype type, int dst)
465	{	579	{
466	prot_major = PROTOCOL_MAJOR;	580	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	581	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	582	randsize = RAND_SIZE;
469	hmaclen = HMACLENGTH;	583	hmaclen = HMACLENGTH;
470	flags = curflags ();	584	flags = 0;
471	challengelen = sizeof (rsachallenge);	585	challengelen = sizeof (rsachallenge);
		586	features = get_features ();
472		587
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	588	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));	589	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	hmac_nid = htonl (EVP_MD_type (DIGEST));
476		591
477	len = sizeof (*this) - sizeof (net_packet);	592	len = sizeof (*this) - sizeof (net_packet);
478	set_hdr (type, dst);	593	set_hdr (type, dst);
479	}	594	}
480		595
		596	bool
481	bool config_packet::chk_config () const	597	config_packet::chk_config () const
482	{	598	{
483	if (prot_major != PROTOCOL_MAJOR)	599	if (prot_major != PROTOCOL_MAJOR)
484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	600	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
485	else if (randsize != RAND_SIZE)	601	else if (randsize != RAND_SIZE)
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	602	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487	else if (hmaclen != HMACLENGTH)	603	else if (hmaclen != HMACLENGTH)
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);	604	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))	605	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));	606	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	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));	608	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)))	609	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
…		…
504		618
505	struct auth_req_packet : config_packet	619	struct auth_req_packet : config_packet
506	{	620	{
507	char magic[8];	621	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	622	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will get patches on forward)	623	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	624	u8 pad2, pad3;
511	rsaid id;	625	rsaid id;
512	rsaencrdata encr;	626	rsaencrdata encr;
513		627
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	628	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	629	{
516	config_packet::setup (PT_AUTH_REQ, dst);	630	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	631	strncpy (magic, MAGIC_OLD, 8);
518	initiate = !!initiate_;	632	initiate = !!initiate_;
519	protocols = protocols_;	633	protocols = protocols_;
520		634
521	len = sizeof (*this) - sizeof (net_packet);	635	len = sizeof (*this) - sizeof (net_packet);
522	}	636	}
…		…
571	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
572		686
573	void	687	void
574	connection::connection_established ()	688	connection::connection_established ()
575	{	689	{
		690	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		691
576	if (ictx && octx)	692	if (ictx && octx)
577	{	693	{
578	connectmode = conf->connectmode;	694	// make sure rekeying timeouts are slightly asymmetric
		695	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		696	rekey.start (rekey_interval, rekey_interval);
579		697
580	rekey.start (NOW + ::conf.rekey);
581	keepalive.start (NOW + ::conf.keepalive);	698	keepalive.start (::conf.keepalive);
582		699
583	// send queued packets	700	// send queued packets
584	if (ictx && octx)	701	if (ictx && octx)
585	{	702	{
586	while (tap_packet p = (tap_packet )data_queue.get ())	703	while (tap_packet p = (tap_packet )data_queue.get ())
587	{	704	{
588	send_data_packet (p);	705	if (p->len) send_data_packet (p);
589	delete p;	706	delete p;
590	}	707	}
591		708
592	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	709	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
593	{	710	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);	711	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;	712	delete p;
596	}	713	}
597	}	714	}
		715
		716	vpn->connection_established (this);
598	}	717	}
599	else	718	else
600	{	719	{
601	retry_cnt = 0;	720	retry_cnt = 0;
602	establish_connection.start (NOW + 5);	721	establish_connection.start (5);
603	keepalive.stop ();	722	keepalive.stop ();
604	rekey.stop ();	723	rekey.stop ();
605	}	724	}
606	}	725	}
607		726
608	void	727	void
609	connection::reset_si ()	728	connection::reset_si ()
610	{	729	{
		730	if (vpn->can_direct (THISNODE, conf))
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);	731	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
612		732	else
613	// mask out protocols we cannot establish	733	{
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	734	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	735	protocol = 0;
		736	}
616		737
617	si.set (conf, protocol);	738	si.set (conf, protocol);
		739
		740	is_direct = si.valid ();
618	}	741	}
619		742
620	// ensure sockinfo is valid, forward if necessary	743	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	744	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	745	connection::forward_si (const sockinfo &si) const
623	{	746	{
624	if (!si.valid ())	747	if (!si.valid ())
625	{	748	{
626	connection *r = vpn->find_router ();	749	connection *r = vpn->find_router_for (this);
627		750
628	if (r)	751	if (r)
629	{	752	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	753	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	754	conf->nodename, r->conf->nodename);
632	return r->si;	755	return r->si;
633	}	756	}
634	else	757	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	758	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	759	conf->nodename);
637	}	760	}
638		761
639	return si;	762	return si;
640	}	763	}
…		…
650	connection::send_ping (const sockinfo &si, u8 pong)	773	connection::send_ping (const sockinfo &si, u8 pong)
651	{	774	{
652	ping_packet *pkt = new ping_packet;	775	ping_packet *pkt = new ping_packet;
653		776
654	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	777	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		778
		779	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		780
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	781	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		782
657	delete pkt;	783	delete pkt;
658	}	784	}
659		785
…		…
678		804
679	rsachallenge chg;	805	rsachallenge chg;
680	rsa_cache.gen (pkt->id, chg);	806	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	807	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
682		808
683	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	809	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
684		810
685	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	811	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
686		812
687	delete pkt;	813	delete pkt;
688	}	814	}
…		…
696		822
697	rsa_hash (id, chg, pkt->response);	823	rsa_hash (id, chg, pkt->response);
698		824
699	pkt->hmac_set (octx);	825	pkt->hmac_set (octx);
700		826
701	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	827	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
702		828
703	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	829	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
704		830
705	delete pkt;	831	delete pkt;
706	}	832	}
707		833
708	void	834	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	835	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	836	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	837	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	838	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		839	conf->protocols);
713		840
714	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	841	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715		842
716	r->hmac_set (octx);	843	r->hmac_set (octx);
717	send_vpn_packet (r, si);	844	send_vpn_packet (r, si);
718		845
719	delete r;	846	delete r;
720	}	847	}
721		848
722	void	849	inline void
723	connection::establish_connection_cb (time_watcher &w)	850	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	851	{
725	if (!ictx	852	if (!(ictx && octx)
726	&& conf != THISNODE	853	&& conf != THISNODE
727	&& connectmode != conf_node::C_NEVER	854	&& connectmode != conf_node::C_NEVER
728	&& connectmode != conf_node::C_DISABLED	855	&& connectmode != conf_node::C_DISABLED
729	&& NOW > w.at)	856	&& !w.is_active ())
730	{	857	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	858	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732		859	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	860	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		861	{
		862	reset_connection ();
734	retry_cnt++;	863	return;
		864	}
735		865
736	w.start (NOW + retry_int);	866	last_establish_attempt = ev_now ();
		867
		868	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		869	? (retry_cnt & 3) + 1
		870	: 1 << (retry_cnt >> 2));
737		871
738	reset_si ();	872	reset_si ();
739		873
740	if (si.prot && !si.host)	874	bool slow = si.prot & PROT_SLOW;
		875
		876	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		877	{
		878	/TODO/ /* start the timer so we don't recurse endlessly */
		879	w.start (1);
741	vpn->send_connect_request (conf->id);	880	vpn->send_connect_request (this);
		881	}
742	else	882	else
743	{	883	{
		884	if (si.valid ())
		885	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		886	conf->nodename, (const char *)si);
		887
744	const sockinfo &dsi = forward_si (si);	888	const sockinfo &dsi = forward_si (si);
		889
		890	slow = slow \|\| (dsi.prot & PROT_SLOW);
745		891
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	892	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	893	{
748	if (retry_cnt < 4)	894	if (retry_cnt < 4)
749	send_auth_request (dsi, true);	895	send_auth_request (dsi, true);
750	else	896	else
751	send_ping (dsi, 0);	897	send_ping (dsi, 0);
752	}	898	}
753	}	899	}
		900
		901	retry_int *= slow ? 8. : 0.9;
		902
		903	if (retry_int < conf->max_retry)
		904	retry_cnt++;
		905	else
		906	retry_int = conf->max_retry;
		907
		908	w.start (retry_int);
754	}	909	}
755	}	910	}
756		911
757	void	912	void
758	connection::reset_connection ()	913	connection::reset_connection ()
…		…
761	{	916	{
762	slog (L_INFO, _("%s(%s): connection lost"),	917	slog (L_INFO, _("%s(%s): connection lost"),
763	conf->nodename, (const char *)si);	918	conf->nodename, (const char *)si);
764		919
765	if (::conf.script_node_down)	920	if (::conf.script_node_down)
766	run_script (run_script_cb (this, &connection::script_node_down), false);	921	{
		922	run_script_cb *cb = new run_script_cb;
		923	cb->set<connection, &connection::script_node_down> (this);
		924	run_script_queued (cb, _("node-down command execution failed, continuing."));
		925	}
767	}	926	}
768		927
769	delete ictx; ictx = 0;	928	delete ictx; ictx = 0;
770	delete octx; octx = 0;	929	delete octx; octx = 0;
771		930
772	si.host= 0;	931	si.host = 0;
773		932
774	last_activity = 0;	933	last_activity = 0.;
		934	//last_si_change = 0.;
775	retry_cnt = 0;	935	retry_cnt = 0;
776		936
777	rekey.stop ();	937	rekey.stop ();
778	keepalive.stop ();	938	keepalive.stop ();
779	establish_connection.stop ();	939	establish_connection.stop ();
…		…
786	send_reset (si);	946	send_reset (si);
787		947
788	reset_connection ();	948	reset_connection ();
789	}	949	}
790		950
791	void	951	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	952	inline void
		953	connection::rekey_cb (ev::timer &w, int revents)
793	{	954	{
794	reset_connection ();	955	reset_connection ();
795	establish_connection ();	956	establish_connection ();
796	}	957	}
797		958
…		…
813	if (oseqno > MAX_SEQNO)	974	if (oseqno > MAX_SEQNO)
814	rekey ();	975	rekey ();
815	}	976	}
816		977
817	void	978	void
		979	connection::post_inject_queue ()
		980	{
		981	// force a connection every now and when when packets are sent (max 1/s)
		982	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		983	establish_connection.stop ();
		984
		985	establish_connection ();
		986	}
		987
		988	void
818	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	989	connection::inject_data_packet (tap_packet *pkt)
819	{	990	{
820	if (ictx && octx)	991	if (ictx && octx)
821	send_data_packet (pkt);	992	send_data_packet (pkt);
822	else	993	else
823	{	994	{
824	if (!broadcast)//DDDD
825	data_queue.put (new tap_packet (*pkt));	995	data_queue.put (new tap_packet (*pkt));
826		996	post_inject_queue ();
827	establish_connection ();
828	}	997	}
829	}	998	}
830		999
		1000	void
831	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1001	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832	{	1002	{
833	if (ictx && octx)	1003	if (ictx && octx)
834	send_vpn_packet (pkt, si, tos);	1004	send_vpn_packet (pkt, si, tos);
835	else	1005	else
836	{	1006	{
837	vpn_queue.put (new vpn_packet (*pkt));	1007	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
838		1008	post_inject_queue ();
839	establish_connection ();
840	}	1009	}
841	}	1010	}
842		1011
843	void	1012	void
844	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1013	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
845	{	1014	{
846	last_activity = NOW;	1015	last_activity = ev_now ();
847		1016
848	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1017	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
849	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1018	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1019
		1020	if (connectmode == conf_node::C_DISABLED)
		1021	return;
850		1022
851	switch (pkt->typ ())	1023	switch (pkt->typ ())
852	{	1024	{
853	case vpn_packet::PT_PING:	1025	case vpn_packet::PT_PING:
		1026	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1027
854	// we send pings instead of auth packets after some retries,	1028	// we send pings instead of auth packets after some retries,
855	// so reset the retry counter and establish a connection	1029	// so reset the retry counter and establish a connection
856	// when we receive a ping.	1030	// when we receive a ping.
857	if (!ictx)	1031	if (!ictx)
858	{	1032	{
859	if (auth_rate_limiter.can (rsi))	1033	if (auth_rate_limiter.can (rsi))
860	send_auth_request (rsi, true);	1034	send_auth_request (rsi, true);
861	}	1035	}
862	else	1036	else
		1037	// we would love to change the socket address here, but ping's aren't
		1038	// authenticated, so we best ignore it.
863	send_ping (rsi, 1); // pong	1039	send_ping (rsi, 1); // pong
864		1040
865	break;	1041	break;
866		1042
867	case vpn_packet::PT_PONG:	1043	case vpn_packet::PT_PONG:
		1044	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1045
		1046	// a PONG might mean that the other side doesn't really know
		1047	// about our desire for communication.
		1048	establish_connection ();
868	break;	1049	break;
869		1050
870	case vpn_packet::PT_RESET:	1051	case vpn_packet::PT_RESET:
871	{	1052	{
872	reset_connection ();	1053	reset_connection ();
873		1054
874	config_packet p = (config_packet ) pkt;	1055	config_packet p = (config_packet ) pkt;
875		1056
876	if (!p->chk_config ())	1057	if (!p->chk_config ())
877	{	1058	{
878	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1059	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
879	conf->nodename, (const char *)rsi);	1060	conf->nodename, (const char *)rsi);
880	connectmode = conf_node::C_DISABLED;	1061	connectmode = conf_node::C_DISABLED;
881	}	1062	}
882	else if (connectmode == conf_node::C_ALWAYS)	1063	else if (connectmode == conf_node::C_ALWAYS)
883	establish_connection ();	1064	establish_connection ();
…		…
885	break;	1066	break;
886		1067
887	case vpn_packet::PT_AUTH_REQ:	1068	case vpn_packet::PT_AUTH_REQ:
888	if (auth_rate_limiter.can (rsi))	1069	if (auth_rate_limiter.can (rsi))
889	{	1070	{
890	auth_req_packet p = (auth_req_packet ) pkt;	1071	auth_req_packet p = (auth_req_packet )pkt;
891		1072
892	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1073	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1074	conf->nodename, p->initiate ? "initiate" : "reply",
		1075	p->protocols, p->features);
893		1076
894	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1077	if (p->chk_config ()
		1078	&& (!memcmp (p->magic, MAGIC_OLD, 8) \|\| !memcmp (p->magic, MAGIC, 8)))
895	{	1079	{
896	if (p->prot_minor != PROTOCOL_MINOR)	1080	if (p->prot_minor != PROTOCOL_MINOR)
897	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1081	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
898	conf->nodename, (const char *)rsi,	1082	conf->nodename, (const char *)rsi,
899	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1083	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
915		1099
916	octx = new crypto_ctx (k, 1);	1100	octx = new crypto_ctx (k, 1);
917	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1101	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
918		1102
919	conf->protocols = p->protocols;	1103	conf->protocols = p->protocols;
		1104	features = p->features & config_packet::get_features ();
920		1105
921	send_auth_response (rsi, p->id, k);	1106	send_auth_response (rsi, p->id, k);
922		1107
923	connection_established ();	1108	connection_established ();
924		1109
925	break;	1110	break;
926	}	1111	}
927	}	1112	}
928	else	1113	else
929	slog (L_WARN, _("%s(%s): protocol mismatch"),	1114	slog (L_WARN, _("%s(%s): protocol mismatch."),
930	conf->nodename, (const char *)rsi);	1115	conf->nodename, (const char *)rsi);
931		1116
932	send_reset (rsi);	1117	send_reset (rsi);
933	}	1118	}
934		1119
935	break;	1120	break;
936		1121
937	case vpn_packet::PT_AUTH_RES:	1122	case vpn_packet::PT_AUTH_RES:
938	{	1123	{
939	auth_res_packet p = (auth_res_packet ) pkt;	1124	auth_res_packet p = (auth_res_packet )pkt;
940		1125
941	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1126	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
942		1127
943	if (p->chk_config ())	1128	if (p->chk_config ())
944	{	1129	{
945	if (p->prot_minor != PROTOCOL_MINOR)	1130	if (p->prot_minor != PROTOCOL_MINOR)
946	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1131	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
949		1134
950	rsachallenge chg;	1135	rsachallenge chg;
951		1136
952	if (!rsa_cache.find (p->id, chg))	1137	if (!rsa_cache.find (p->id, chg))
953	{	1138	{
954	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1139	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
955	conf->nodename, (const char *)rsi);	1140	conf->nodename, (const char *)rsi);
956	break;	1141	break;
957	}	1142	}
958	else	1143	else
959	{	1144	{
960	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1145	crypto_ctx *cctx = new crypto_ctx (chg, 0);
961		1146
962	if (!p->hmac_chk (cctx))	1147	if (!p->hmac_chk (cctx))
963	{	1148	{
964	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1149	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"),	1150	"could be an attack, or just corruption or a synchronization error."),
966	conf->nodename, (const char *)rsi);	1151	conf->nodename, (const char *)rsi);
967	break;	1152	break;
968	}	1153	}
969	else	1154	else
970	{	1155	{
…		…
981	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1166	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
982		1167
983	si = rsi;	1168	si = rsi;
984	protocol = rsi.prot;	1169	protocol = rsi.prot;
985		1170
		1171	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		1172	conf->nodename, (const char *)rsi,
		1173	is_direct ? "direct" : "forwarded",
		1174	p->prot_major, p->prot_minor);
		1175
986	connection_established ();	1176	connection_established ();
987		1177
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)	1178	if (::conf.script_node_up)
993	run_script (run_script_cb (this, &connection::script_node_up), false);	1179	{
		1180	run_script_cb *cb = new run_script_cb;
		1181	cb->set<connection, &connection::script_node_up> (this);
		1182	run_script_queued (cb, _("node-up command execution failed, continuing."));
		1183	}
994		1184
995	break;	1185	break;
996	}	1186	}
997	else	1187	else
998	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1188	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
999	conf->nodename, (const char *)rsi);	1189	conf->nodename, (const char *)rsi);
1000	}	1190	}
1001		1191
1002	delete cctx;	1192	delete cctx;
1003	}	1193	}
…		…
1019	{	1209	{
1020	vpndata_packet p = (vpndata_packet )pkt;	1210	vpndata_packet p = (vpndata_packet )pkt;
1021		1211
1022	if (!p->hmac_chk (ictx))	1212	if (!p->hmac_chk (ictx))
1023	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1213	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1024	"could be an attack, or just corruption or an synchronization error"),	1214	"could be an attack, or just corruption or a synchronization error."),
1025	conf->nodename, (const char *)rsi);	1215	conf->nodename, (const char *)rsi);
1026	else	1216	else
1027	{	1217	{
1028	u32 seqno;	1218	u32 seqno;
1029	tap_packet *d = p->unpack (this, seqno);	1219	tap_packet *d = p->unpack (this, seqno);
		1220	int seqclass = iseqno.seqno_classify (seqno);
1030		1221
1031	if (iseqno.recv_ok (seqno))	1222	if (seqclass == 0) // ok
1032	{	1223	{
1033	vpn->tap->send (d);	1224	vpn->tap->send (d);
1034		1225
1035	if (si != rsi)	1226	if (si != rsi)
1036	{	1227	{
1037	// fast re-sync on connection changes, useful especially for tcp/ip	1228	// fast re-sync on source address changes, useful especially for tcp/ip
		1229	//if (last_si_change < ev_now () + 5.)
1038	si = rsi;	1230	// {
1039
1040	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1231	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1041	conf->nodename, (const char )si, (const char )rsi);	1232	conf->nodename, (const char )si, (const char )rsi);
		1233
		1234	si = rsi;
		1235
		1236	if (::conf.script_node_change)
		1237	{
		1238	run_script_cb *cb = new run_script_cb;
		1239	cb->set<connection, &connection::script_node_change> (this);
		1240	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1241	}
		1242
		1243	// }
		1244	//else
		1245	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1246	// conf->nodename, (const char )si, (const char )rsi);
1042	}	1247	}
1043
1044	delete d;
1045
1046	break;
1047	}	1248	}
		1249	else if (seqclass == 1) // far history
		1250	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1251	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1252	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1253	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1254	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1255	else if (seqclass == 3) // reset
		1256	{
		1257	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1258	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1259	send_reset (rsi);
		1260	}
		1261
		1262	delete d;
		1263	break;
1048	}	1264	}
1049	}	1265	}
1050		1266
1051	send_reset (rsi);	1267	send_reset (rsi);
1052	break;	1268	break;
1053		1269
1054	case vpn_packet::PT_CONNECT_REQ:	1270	case vpn_packet::PT_CONNECT_REQ:
1055	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1271	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1056	{	1272	{
1057	connect_req_packet p = (connect_req_packet ) pkt;	1273	connect_req_packet p = (connect_req_packet )pkt;
1058		1274
1059	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1275	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	{	1276	{
		1277	connection *c = vpn->conns[p->id - 1];
		1278	conf->protocols = p->protocols;
		1279
		1280	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1281	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1282	p->protocols,
		1283	c->ictx && c->octx);
		1284
		1285	if (c->ictx && c->octx)
		1286	{
1068	// send connect_info packets to both sides, in case one is	1287	// send connect_info packets to both sides, in case one is
1069	// behind a nat firewall (or both ;)	1288	// behind a nat firewall (or both ;)
1070	c->send_connect_info (conf->id, si, conf->protocols);	1289	c->send_connect_info (conf->id, si, conf->protocols);
1071	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1290	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1291	}
		1292	else
		1293	c->establish_connection ();
1072	}	1294	}
1073	else	1295	else
1074	c->establish_connection ();	1296	slog (L_WARN,
		1297	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1298	p->id);
1075	}	1299	}
1076		1300
1077	break;	1301	break;
1078		1302
1079	case vpn_packet::PT_CONNECT_INFO:	1303	case vpn_packet::PT_CONNECT_INFO:
1080	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1304	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1081	{	1305	{
1082	connect_info_packet p = (connect_info_packet ) pkt;	1306	connect_info_packet p = (connect_info_packet )pkt;
1083		1307
1084	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1308	if (p->id > 0 && p->id <= vpn->conns.size ())
1085		1309	{
1086	connection *c = vpn->conns[p->id - 1];	1310	connection *c = vpn->conns[p->id - 1];
1087		1311
1088	c->conf->protocols = p->protocols;	1312	c->conf->protocols = p->protocols;
1089	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1313	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1090	p->si.upgrade_protocol (protocol, c->conf);	1314	p->si.upgrade_protocol (protocol, c->conf);
1091		1315
1092	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1316	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1093	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1317	conf->nodename,
		1318	vpn->conns[p->id - 1]->conf->nodename,
		1319	(const char *)p->si,
		1320	p->protocols,
		1321	protocol,
		1322	p->si.supported_protocols (c->conf),
		1323	!c->ictx && !c->octx);
1094		1324
1095	const sockinfo &dsi = forward_si (p->si);	1325	const sockinfo &dsi = forward_si (p->si);
1096		1326
1097	if (dsi.valid ())	1327	if (dsi.valid ())
1098	c->send_auth_request (dsi, true);	1328	c->send_auth_request (dsi, true);
		1329	else
		1330	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1331	vpn->conns[p->id - 1]->conf->nodename,
		1332	(const char *)p->si);
		1333	}
		1334	else
		1335	slog (L_WARN,
		1336	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1337	p->id);
1099	}	1338	}
1100		1339
1101	break;	1340	break;
1102		1341
1103	default:	1342	default:
1104	send_reset (rsi);	1343	send_reset (rsi);
1105	break;	1344	break;
1106	}	1345	}
1107	}	1346	}
1108		1347
1109	void connection::keepalive_cb (time_watcher &w)	1348	inline void
		1349	connection::keepalive_cb (ev::timer &w, int revents)
1110	{	1350	{
1111	if (NOW >= last_activity + ::conf.keepalive + 30)	1351	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1352
		1353	if (when >= 0)
		1354	w.start (when);
		1355	else if (when < -15)
1112	{	1356	{
1113	reset_connection ();	1357	reset_connection ();
1114	establish_connection ();	1358	establish_connection ();
1115	}	1359	}
1116	else if (NOW < last_activity + ::conf.keepalive)
1117	w.start (last_activity + ::conf.keepalive);
1118	else if (conf->connectmode != conf_node::C_ONDEMAND	1360	else if (conf->connectmode != conf_node::C_ONDEMAND
1119	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1361	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1120	{	1362	{
		1363	w.start (3);
1121	send_ping (si);	1364	send_ping (si);
1122	w.start (NOW + 5);
1123	}	1365	}
1124	else if (NOW < last_activity + ::conf.keepalive + 10)	1366	else if (when >= -10)
1125	// hold ondemand connections implicitly a few seconds longer	1367	// hold ondemand connections implicitly a few seconds longer
1126	// should delete octx, though, or something like that ;)	1368	// should delete octx, though, or something like that ;)
1127	w.start (last_activity + ::conf.keepalive + 10);	1369	w.start (when + 10);
1128	else	1370	else
1129	reset_connection ();	1371	reset_connection ();
1130	}	1372	}
1131		1373
		1374	void
1132	void connection::send_connect_request (int id)	1375	connection::send_connect_request (int id)
1133	{	1376	{
1134	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1377	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1135		1378
1136	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1379	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1380	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1381	THISNODE->protocols);
1137	p->hmac_set (octx);	1382	p->hmac_set (octx);
1138	send_vpn_packet (p, si);	1383	send_vpn_packet (p, si);
1139		1384
1140	delete p;	1385	delete p;
1141	}	1386	}
1142		1387
1143	void connection::script_node ()	1388	void
		1389	connection::script_init_env (const char *ext)
1144	{	1390	{
1145	vpn->script_if_up ();
1146
1147	char *env;	1391	char *env;
		1392	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1393	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1394	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1395	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1396	conf->id & 0xff); putenv (env);
		1397	}
		1398
		1399	void
		1400	connection::script_init_connect_env ()
		1401	{
		1402	vpn->script_init_env ();
		1403
		1404	char *env;
1148	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1405	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1406	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1149	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1407	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1150	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1408	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1151	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1409	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1152	}	1410	}
1153		1411
		1412	inline const char *
1154	const char *connection::script_node_up ()	1413	connection::script_node_up ()
1155	{	1414	{
1156	script_node ();	1415	script_init_connect_env ();
1157		1416
1158	putenv ("STATE=up");	1417	putenv ((char *)"STATE=up");
1159		1418
		1419	char *filename;
		1420	asprintf (&filename,
		1421	"%s/%s",
		1422	confbase,
1160	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1423	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1161	}
1162		1424
		1425	return filename;
		1426	}
		1427
		1428	inline const char *
		1429	connection::script_node_change ()
		1430	{
		1431	script_init_connect_env ();
		1432
		1433	putenv ((char *)"STATE=change");
		1434
		1435	char *filename;
		1436	asprintf (&filename,
		1437	"%s/%s",
		1438	confbase,
		1439	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1440
		1441	return filename;
		1442	}
		1443
		1444	inline const char *
1163	const char *connection::script_node_down ()	1445	connection::script_node_down ()
1164	{	1446	{
1165	script_node ();	1447	script_init_connect_env ();
1166		1448
1167	putenv ("STATE=down");	1449	putenv ((char *)"STATE=down");
1168		1450
1169	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1451	char *filename;
1170	}	1452	asprintf (&filename,
		1453	"%s/%s",
		1454	confbase,
		1455	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1171		1456
		1457	return filename;
		1458	}
		1459
1172	connection::connection(struct vpn *vpn_)	1460	connection::connection (struct vpn vpn, conf_node conf)
1173	: vpn(vpn_)	1461	: vpn(vpn), conf(conf),
1174	, rekey (this, &connection::rekey_cb)	1462	#if ENABLE_DNS
1175	, keepalive (this, &connection::keepalive_cb)	1463	dns (0),
		1464	#endif
		1465	data_queue(conf->max_ttl, conf->max_queue + 1),
		1466	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1467	{
		1468	rekey .set<connection, &connection::rekey_cb > (this);
		1469	keepalive .set<connection, &connection::keepalive_cb > (this);
1176	, establish_connection (this, &connection::establish_connection_cb)	1470	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1177	{	1471
		1472	last_establish_attempt = 0.;
1178	octx = ictx = 0;	1473	octx = ictx = 0;
1179	retry_cnt = 0;
1180		1474
1181	connectmode = conf_node::C_ALWAYS; // initial setting	1475	connectmode = conf->connectmode;
		1476
		1477	// queue a dummy packet to force an initial connection attempt
		1478	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1479	vpn_queue.put (new net_packet);
		1480
1182	reset_connection ();	1481	reset_connection ();
1183	}	1482	}
1184		1483
1185	connection::~connection ()	1484	connection::~connection ()
1186	{	1485	{
1187	shutdown ();	1486	shutdown ();
1188	}	1487	}
1189		1488
		1489	void
1190	void connection_init ()	1490	connection_init ()
1191	{	1491	{
1192	auth_rate_limiter.clear ();	1492	auth_rate_limiter.clear ();
1193	reset_rate_limiter.clear ();	1493	reset_rate_limiter.clear ();
1194	}	1494	}
1195		1495

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Comparing gvpe/src/connection.C (file contents): Revision 1.26 by pcg, Sat Jan 17 14:08:57 2004 UTC vs. Revision 1.97 by root, Tue Dec 4 13:23:17 2012 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.26 by pcg, Sat Jan 17 14:08:57 2004 UTC vs.
Revision 1.97 by root, Tue Dec 4 13:23:17 2012 UTC