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

Comparing gvpe/src/connection.C (file contents):
Revision 1.31 by pcg, Sun Feb 8 07:24:25 2004 UTC vs.
Revision 1.92 by root, Thu Feb 10 03:59:51 2011 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	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
26	#include <openssl/rand.h>	38	#include <openssl/rand.h>
27	#include <openssl/evp.h>	39	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
29	#include <openssl/err.h>	41	#include <openssl/err.h>
30
31	#include "gettext.h"
32		42
33	#include "conf.h"	43	#include "conf.h"
34	#include "slog.h"	44	#include "slog.h"
35	#include "device.h"	45	#include "device.h"
36	#include "vpn.h"	46	#include "vpn.h"
40		50
41	#if !HAVE_RAND_PSEUDO_BYTES	51	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes	52	# define RAND_pseudo_bytes RAND_bytes
43	#endif	53	#endif
44		54
45	#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)
46		57
47	#define ULTRA_FAST 1	58	#define ULTRA_FAST 1
48	#define HLOG 15	59	#define HLOG 15
49	#include "lzf/lzf.h"	60	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	61	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.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	//////////////////////////////////////////////////////////////////////////////
52		107
53	struct crypto_ctx	108	struct crypto_ctx
54	{	109	{
55	EVP_CIPHER_CTX cctx;	110	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	111	HMAC_CTX hctx;
…		…
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));	139	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	140	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);	141	EVP_MD_CTX_cleanup (&ctx);
87	}	142	}
88		143
89	struct rsa_entry {	144	struct rsa_entry
		145	{
90	tstamp expire;	146	tstamp expire;
91	rsaid id;	147	rsaid id;
92	rsachallenge chg;	148	rsachallenge chg;
93	};	149	};
94		150
95	struct rsa_cache : list<rsa_entry>	151	struct rsa_cache : list<rsa_entry>
96	{	152	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	153	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
98		154
99	bool find (const rsaid &id, rsachallenge &chg)	155	bool find (const rsaid &id, rsachallenge &chg)
100	{	156	{
101	for (iterator i = begin (); i != end (); ++i)	157	for (iterator i = begin (); i != end (); ++i)
102	{	158	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	159	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
104	{	160	{
105	memcpy (&chg, &i->chg, sizeof chg);	161	memcpy (&chg, &i->chg, sizeof chg);
106		162
107	erase (i);	163	erase (i);
108	return true;	164	return true;
109	}	165	}
110	}	166	}
111		167
112	if (cleaner.at < NOW)	168	if (!cleaner.is_active ())
113	cleaner.start (NOW + RSA_TTL);	169	cleaner.again ();
114		170
115	return false;	171	return false;
116	}	172	}
117		173
118	void gen (rsaid &id, rsachallenge &chg)	174	void gen (rsaid &id, rsachallenge &chg)
119	{	175	{
120	rsa_entry e;	176	rsa_entry e;
121		177
122	RAND_bytes ((unsigned char *)&id, sizeof id);	178	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);	179	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124		180
125	e.expire = NOW + RSA_TTL;	181	e.expire = ev_now () + RSA_TTL;
126	e.id = id;	182	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);	183	memcpy (&e.chg, &chg, sizeof chg);
128		184
129	push_back (e);	185	push_back (e);
130		186
131	if (cleaner.at < NOW)	187	if (!cleaner.is_active ())
132	cleaner.start (NOW + RSA_TTL);	188	cleaner.again ();
133	}	189	}
134		190
135	rsa_cache ()	191	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)	192	{
137	{ }	193	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
		194	cleaner.set (RSA_TTL, RSA_TTL);
		195	}
138		196
139	} rsa_cache;	197	} rsa_cache;
140		198
141	void rsa_cache::cleaner_cb (time_watcher &w)	199	void
		200	rsa_cache::cleaner_cb (ev::timer &w, int revents)
142	{	201	{
143	if (!empty ())	202	if (empty ())
		203	w.stop ();
		204	else
144	{	205	{
145	w.start (NOW + RSA_TTL);
146
147	for (iterator i = begin (); i != end (); )	206	for (iterator i = begin (); i != end (); )
148	if (i->expire <= NOW)	207	if (i->expire <= ev_now ())
149	i = erase (i);	208	i = erase (i);
150	else	209	else
151	++i;	210	++i;
152	}	211	}
153	}	212	}
154		213
155	//////////////////////////////////////////////////////////////////////////////	214	//////////////////////////////////////////////////////////////////////////////
156		215
157	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)
158	{	218	{
159	if (queue[i])	219	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		220
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	221	i = 0;
187	j = 0;	222	j = 0;
		223
		224	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	225	}
189		226
190	pkt_queue::~pkt_queue ()	227	pkt_queue::~pkt_queue ()
191	{	228	{
192	for (i = QUEUEDEPTH; --i > 0; )	229	while (net_packet *p = get ())
		230	delete p;
		231
193	delete queue[i];	232	delete [] queue;
194	}	233	}
195		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
196	struct net_rateinfo {	291	struct net_rateinfo
		292	{
197	u32 host;	293	u32 host;
198	double pcnt, diff;	294	double pcnt, diff;
199	tstamp last;	295	tstamp last;
200	};	296	};
201		297
202	// 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.
203	// this implementation ("splay list" ;) is inefficient,	299	// this implementation ("splay list" ;) is inefficient,
204	// but low on resources.	300	// but low on resources.
205	struct net_rate_limiter : list<net_rateinfo>	301	struct net_rate_limiter : list<net_rateinfo>
206	{	302	{
207	static const double ALPHA = 1. - 1. / 600.; // allow bursts	303	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
208	static const double CUTOFF = 10.; // one event every CUTOFF seconds	304	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
209	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	305	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
210	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
211		307
212	bool can (const sockinfo &si) { return can((u32)si.host); }	308	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	309	bool can (u32 host);
214	};	310	};
215		311
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	312	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		313
		314	bool
218	bool net_rate_limiter::can (u32 host)	315	net_rate_limiter::can (u32 host)
219	{	316	{
220	iterator i;	317	iterator i;
221		318
222	for (i = begin (); i != end (); )	319	for (i = begin (); i != end (); )
223	if (i->host == host)	320	if (i->host == host)
224	break;	321	break;
225	else if (i->last < NOW - EXPIRE)	322	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	323	i = erase (i);
227	else	324	else
228	i++;	325	i++;
229		326
230	if (i == end ())	327	if (i == end ())
231	{	328	{
232	net_rateinfo ri;	329	net_rateinfo ri;
233		330
234	ri.host = host;	331	ri.host = host;
235	ri.pcnt = 1.;	332	ri.pcnt = 1.;
236	ri.diff = MAXDIF;	333	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	334	ri.last = ev_now ();
238		335
239	push_front (ri);	336	push_front (ri);
240		337
241	return true;	338	return true;
242	}	339	}
243	else	340	else
244	{	341	{
245	net_rateinfo ri (*i);	342	net_rateinfo ri (*i);
246	erase (i);	343	erase (i);
247		344
248	ri.pcnt = ri.pcnt * ALPHA;	345	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	346	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		347
251	ri.last = NOW;	348	ri.last = ev_now ();
252		349
253	double dif = ri.diff / ri.pcnt;	350	double dif = ri.diff / ri.pcnt;
254		351
255	bool send = dif > CUTOFF;	352	bool send = dif > NRL_CUTOFF;
256		353
257	if (dif > MAXDIF)	354	if (dif > NRL_MAXDIF)
258	{	355	{
259	ri.pcnt = 1.;	356	ri.pcnt = 1.;
260	ri.diff = MAXDIF;	357	ri.diff = NRL_MAXDIF;
261	}	358	}
262	else if (send)	359	else if (send)
263	ri.pcnt++;	360	ri.pcnt++;
264		361
265	push_front (ri);	362	push_front (ri);
…		…
270		367
271	/////////////////////////////////////////////////////////////////////////////	368	/////////////////////////////////////////////////////////////////////////////
272		369
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	370	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
274		371
		372	void
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx)
276	{	374	{
277	unsigned int xlen;	375	unsigned int xlen;
278		376
279	HMAC_CTX *hctx = &ctx->hctx;	377	HMAC_CTX *hctx = &ctx->hctx;
280		378
…		…
298	hmac_gen (ctx);	396	hmac_gen (ctx);
299		397
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	398	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	399	}
302		400
		401	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	402	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	403	{
305	type = type_;	404	type = type_;
306		405
307	int src = THISNODE->id;	406	int src = THISNODE->id;
308		407
…		…
313		412
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	413	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	414	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		415
317	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
318	{	425	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
322	tap_packet unpack (connection conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	426	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	427	}
		428	};
330		429
331	void	430	void
332	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)
333	{	432	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	433	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	435	ptype type = PT_DATA_UNCOMPRESSED;
337		436
338	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
340		439
341	if (conn->features & ENABLE_COMPRESSION)	440	if (conn->features & FEATURE_COMPRESSION)
342	{	441	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		443
345	if (cl)	444	if (cl)
346	{	445	{
…		…
456	u8 flags, challengelen, features, pad3;	555	u8 flags, challengelen, features, pad3;
457	u32 cipher_nid, digest_nid, hmac_nid;	556	u32 cipher_nid, digest_nid, hmac_nid;
458		557
459	void setup (ptype type, int dst);	558	void setup (ptype type, int dst);
460	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	}
461	};	575	};
462		576
463	#define FEATURES ((ENABLE_COMPRESSION ? FEATURE_COMPRESSION : 0) \	577	void
464	\| (ENABLE_ROHC ? FEATURE_ROHC : 0))
465
466	void config_packet::setup (ptype type, int dst)	578	config_packet::setup (ptype type, int dst)
467	{	579	{
468	prot_major = PROTOCOL_MAJOR;	580	prot_major = PROTOCOL_MAJOR;
469	prot_minor = PROTOCOL_MINOR;	581	prot_minor = PROTOCOL_MINOR;
470	randsize = RAND_SIZE;	582	randsize = RAND_SIZE;
471	hmaclen = HMACLENGTH;	583	hmaclen = HMACLENGTH;
472	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;	584	flags = 0;
473	challengelen = sizeof (rsachallenge);	585	challengelen = sizeof (rsachallenge);
474	features = FEATURES;	586	features = get_features ();
475		587
476	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	588	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
477	digest_nid = htonl (EVP_MD_type (RSA_HASH));	589	digest_nid = htonl (EVP_MD_type (RSA_HASH));
478	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	hmac_nid = htonl (EVP_MD_type (DIGEST));
479		591
480	len = sizeof (*this) - sizeof (net_packet);	592	len = sizeof (*this) - sizeof (net_packet);
481	set_hdr (type, dst);	593	set_hdr (type, dst);
482	}	594	}
483		595
		596	bool
484	bool config_packet::chk_config () const	597	config_packet::chk_config () const
485	{	598	{
486	if (prot_major != PROTOCOL_MAJOR)	599	if (prot_major != PROTOCOL_MAJOR)
487	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);
488	else if (randsize != RAND_SIZE)	601	else if (randsize != RAND_SIZE)
489	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);
490	else if (hmaclen != HMACLENGTH)	603	else if (hmaclen != HMACLENGTH)
491	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);
492	#if 0 // this implementation should handle all flag settings
493	else if (flags != curflags ())
494	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
495	#endif
496	else if (challengelen != sizeof (rsachallenge))	605	else if (challengelen != sizeof (rsachallenge))
497	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));
498	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
499	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));
500	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
…		…
517	rsaencrdata encr;	626	rsaencrdata encr;
518		627
519	auth_req_packet (int dst, bool initiate_, u8 protocols_)	628	auth_req_packet (int dst, bool initiate_, u8 protocols_)
520	{	629	{
521	config_packet::setup (PT_AUTH_REQ, dst);	630	config_packet::setup (PT_AUTH_REQ, dst);
522	strncpy (magic, MAGIC, 8);	631	strncpy (magic, MAGIC_OLD, 8);
523	initiate = !!initiate_;	632	initiate = !!initiate_;
524	protocols = protocols_;	633	protocols = protocols_;
525		634
526	len = sizeof (*this) - sizeof (net_packet);	635	len = sizeof (*this) - sizeof (net_packet);
527	}	636	}
…		…
576	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
577		686
578	void	687	void
579	connection::connection_established ()	688	connection::connection_established ()
580	{	689	{
		690	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		691
581	if (ictx && octx)	692	if (ictx && octx)
582	{	693	{
583	connectmode = conf->connectmode;	694	// make sure rekeying timeouts are slightly asymmetric
584		695	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
585	rekey.start (NOW + ::conf.rekey);	696	rekey.start (rekey_interval, rekey_interval);
586	keepalive.start (NOW + ::conf.keepalive);	697	keepalive.start (::conf.keepalive);
587		698
588	// send queued packets	699	// send queued packets
589	if (ictx && octx)	700	if (ictx && octx)
590	{	701	{
591	while (tap_packet p = (tap_packet )data_queue.get ())	702	while (tap_packet p = (tap_packet )data_queue.get ())
592	{	703	{
593	send_data_packet (p);	704	if (p->len) send_data_packet (p);
594	delete p;	705	delete p;
595	}	706	}
596		707
597	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	708	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
598	{	709	{
599	send_vpn_packet (p, si, IPTOS_RELIABILITY);	710	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
600	delete p;	711	delete p;
601	}	712	}
602	}	713	}
		714
		715	vpn->connection_established (this);
603	}	716	}
604	else	717	else
605	{	718	{
606	retry_cnt = 0;	719	retry_cnt = 0;
607	establish_connection.start (NOW + 5);	720	establish_connection.start (5);
608	keepalive.stop ();	721	keepalive.stop ();
609	rekey.stop ();	722	rekey.stop ();
610	}	723	}
611	}	724	}
612		725
613	void	726	void
614	connection::reset_si ()	727	connection::reset_si ()
615	{	728	{
		729	if (vpn->can_direct (THISNODE, conf))
616	protocol = best_protocol (THISNODE->protocols & conf->protocols);	730	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
617		731	else
618	// mask out protocols we cannot establish	732	{
619	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	733	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
620	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	734	protocol = 0;
		735	}
621		736
622	si.set (conf, protocol);	737	si.set (conf, protocol);
		738
		739	is_direct = si.valid ();
623	}	740	}
624		741
625	// ensure sockinfo is valid, forward if necessary	742	// ensure sockinfo is valid, forward if necessary
626	const sockinfo &	743	const sockinfo &
627	connection::forward_si (const sockinfo &si) const	744	connection::forward_si (const sockinfo &si) const
628	{	745	{
629	if (!si.valid ())	746	if (!si.valid ())
630	{	747	{
631	connection *r = vpn->find_router ();	748	connection *r = vpn->find_router_for (this);
632		749
633	if (r)	750	if (r)
634	{	751	{
635	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	752	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
636	conf->nodename, r->conf->nodename);	753	conf->nodename, r->conf->nodename);
637	return r->si;	754	return r->si;
638	}	755	}
639	else	756	else
640	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	757	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
641	conf->nodename);	758	conf->nodename);
642	}	759	}
643		760
644	return si;	761	return si;
645	}	762	}
…		…
655	connection::send_ping (const sockinfo &si, u8 pong)	772	connection::send_ping (const sockinfo &si, u8 pong)
656	{	773	{
657	ping_packet *pkt = new ping_packet;	774	ping_packet *pkt = new ping_packet;
658		775
659	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	776	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		777
		778	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		779
660	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	780	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
661		781
662	delete pkt;	782	delete pkt;
663	}	783	}
664		784
…		…
683		803
684	rsachallenge chg;	804	rsachallenge chg;
685	rsa_cache.gen (pkt->id, chg);	805	rsa_cache.gen (pkt->id, chg);
686	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	806	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
687		807
688	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	808	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
689		809
690	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	810	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
691		811
692	delete pkt;	812	delete pkt;
693	}	813	}
…		…
701		821
702	rsa_hash (id, chg, pkt->response);	822	rsa_hash (id, chg, pkt->response);
703		823
704	pkt->hmac_set (octx);	824	pkt->hmac_set (octx);
705		825
706	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
707		827
708	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	828	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
709		829
710	delete pkt;	830	delete pkt;
711	}	831	}
712		832
713	void	833	void
714	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	834	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
715	{	835	{
716	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	836	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
717	conf->id, rid, (const char *)rsi);	837	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
718		838
719	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	839	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
720		840
721	r->hmac_set (octx);	841	r->hmac_set (octx);
722	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
723		843
724	delete r;	844	delete r;
725	}	845	}
726		846
727	void	847	inline void
728	connection::establish_connection_cb (time_watcher &w)	848	connection::establish_connection_cb (ev::timer &w, int revents)
729	{	849	{
730	if (!ictx	850	if (!(ictx && octx)
731	&& conf != THISNODE	851	&& conf != THISNODE
732	&& connectmode != conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
733	&& connectmode != conf_node::C_DISABLED	853	&& connectmode != conf_node::C_DISABLED
734	&& NOW > w.at)	854	&& !w.is_active ())
735	{	855	{
736	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
737		857	// and stop trying. should probably be handled by a per-connection expire handler.
738	if (retry_int < 3600 * 8)	858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ();
739	retry_cnt++;	861	return;
		862	}
740		863
741	w.start (NOW + retry_int);	864	last_establish_attempt = ev_now ();
		865
		866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		867	? (retry_cnt & 3) + 1
		868	: 1 << (retry_cnt >> 2));
742		869
743	reset_si ();	870	reset_si ();
744		871
745	if (si.prot && !si.host)	872	bool slow = si.prot & PROT_SLOW;
		873
		874	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		875	{
		876	/TODO/ /* start the timer so we don't recurse endlessly */
		877	w.start (1);
746	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
		879	}
747	else	880	else
748	{	881	{
		882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
		885
749	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
		887
		888	slow = slow \|\| (dsi.prot & PROT_SLOW);
750		889
751	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
752	{	891	{
753	if (retry_cnt < 4)	892	if (retry_cnt < 4)
754	send_auth_request (dsi, true);	893	send_auth_request (dsi, true);
755	else	894	else
756	send_ping (dsi, 0);	895	send_ping (dsi, 0);
757	}	896	}
758	}	897	}
		898
		899	retry_int *= slow ? 8. : 0.9;
		900
		901	if (retry_int < conf->max_retry)
		902	retry_cnt++;
		903	else
		904	retry_int = conf->max_retry;
		905
		906	w.start (retry_int);
759	}	907	}
760	}	908	}
761		909
762	void	910	void
763	connection::reset_connection ()	911	connection::reset_connection ()
…		…
766	{	914	{
767	slog (L_INFO, _("%s(%s): connection lost"),	915	slog (L_INFO, _("%s(%s): connection lost"),
768	conf->nodename, (const char *)si);	916	conf->nodename, (const char *)si);
769		917
770	if (::conf.script_node_down)	918	if (::conf.script_node_down)
771	run_script (run_script_cb (this, &connection::script_node_down), false);	919	{
		920	run_script_cb *cb = new run_script_cb;
		921	cb->set<connection, &connection::script_node_down> (this);
		922	run_script_queued (cb, _("node-down command execution failed, continuing."));
		923	}
772	}	924	}
773		925
774	delete ictx; ictx = 0;	926	delete ictx; ictx = 0;
775	delete octx; octx = 0;	927	delete octx; octx = 0;
		928	#if ENABLE_DNS
		929	dnsv4_reset_connection ();
		930	#endif
776		931
777	si.host= 0;	932	si.host = 0;
778		933
779	last_activity = 0;	934	last_activity = 0.;
		935	//last_si_change = 0.;
780	retry_cnt = 0;	936	retry_cnt = 0;
781		937
782	rekey.stop ();	938	rekey.stop ();
783	keepalive.stop ();	939	keepalive.stop ();
784	establish_connection.stop ();	940	establish_connection.stop ();
…		…
791	send_reset (si);	947	send_reset (si);
792		948
793	reset_connection ();	949	reset_connection ();
794	}	950	}
795		951
796	void	952	// poor-man's rekeying
797	connection::rekey_cb (time_watcher &w)	953	inline void
		954	connection::rekey_cb (ev::timer &w, int revents)
798	{	955	{
799	reset_connection ();	956	reset_connection ();
800	establish_connection ();	957	establish_connection ();
801	}	958	}
802		959
…		…
818	if (oseqno > MAX_SEQNO)	975	if (oseqno > MAX_SEQNO)
819	rekey ();	976	rekey ();
820	}	977	}
821		978
822	void	979	void
		980	connection::post_inject_queue ()
		981	{
		982	// force a connection every now and when when packets are sent (max 1/s)
		983	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		984	establish_connection.stop ();
		985
		986	establish_connection ();
		987	}
		988
		989	void
823	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	990	connection::inject_data_packet (tap_packet *pkt)
824	{	991	{
825	if (ictx && octx)	992	if (ictx && octx)
826	send_data_packet (pkt);	993	send_data_packet (pkt);
827	else	994	else
828	{	995	{
829	if (!broadcast)//DDDD
830	data_queue.put (new tap_packet (*pkt));	996	data_queue.put (new tap_packet (*pkt));
831		997	post_inject_queue ();
832	establish_connection ();
833	}	998	}
834	}	999	}
835		1000
		1001	void
836	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1002	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
837	{	1003	{
838	if (ictx && octx)	1004	if (ictx && octx)
839	send_vpn_packet (pkt, si, tos);	1005	send_vpn_packet (pkt, si, tos);
840	else	1006	else
841	{	1007	{
842	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1008	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
843		1009	post_inject_queue ();
844	establish_connection ();
845	}	1010	}
846	}	1011	}
847		1012
848	void	1013	void
849	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1014	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
850	{	1015	{
851	last_activity = NOW;	1016	last_activity = ev_now ();
852		1017
853	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1018	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
854	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1019	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1020
		1021	if (connectmode == conf_node::C_DISABLED)
		1022	return;
855		1023
856	switch (pkt->typ ())	1024	switch (pkt->typ ())
857	{	1025	{
858	case vpn_packet::PT_PING:	1026	case vpn_packet::PT_PING:
		1027	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1028
859	// we send pings instead of auth packets after some retries,	1029	// we send pings instead of auth packets after some retries,
860	// so reset the retry counter and establish a connection	1030	// so reset the retry counter and establish a connection
861	// when we receive a ping.	1031	// when we receive a ping.
862	if (!ictx)	1032	if (!ictx)
863	{	1033	{
864	if (auth_rate_limiter.can (rsi))	1034	if (auth_rate_limiter.can (rsi))
865	send_auth_request (rsi, true);	1035	send_auth_request (rsi, true);
866	}	1036	}
867	else	1037	else
		1038	// we would love to change the socket address here, but ping's aren't
		1039	// authenticated, so we best ignore it.
868	send_ping (rsi, 1); // pong	1040	send_ping (rsi, 1); // pong
869		1041
870	break;	1042	break;
871		1043
872	case vpn_packet::PT_PONG:	1044	case vpn_packet::PT_PONG:
		1045	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1046
		1047	// a PONG might mean that the other side doesn't really know
		1048	// about our desire for communication.
		1049	establish_connection ();
873	break;	1050	break;
874		1051
875	case vpn_packet::PT_RESET:	1052	case vpn_packet::PT_RESET:
876	{	1053	{
877	reset_connection ();	1054	reset_connection ();
878		1055
879	config_packet p = (config_packet ) pkt;	1056	config_packet p = (config_packet ) pkt;
880		1057
881	if (!p->chk_config ())	1058	if (!p->chk_config ())
882	{	1059	{
883	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1060	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
884	conf->nodename, (const char *)rsi);	1061	conf->nodename, (const char *)rsi);
885	connectmode = conf_node::C_DISABLED;	1062	connectmode = conf_node::C_DISABLED;
886	}	1063	}
887	else if (connectmode == conf_node::C_ALWAYS)	1064	else if (connectmode == conf_node::C_ALWAYS)
888	establish_connection ();	1065	establish_connection ();
…		…
892	case vpn_packet::PT_AUTH_REQ:	1069	case vpn_packet::PT_AUTH_REQ:
893	if (auth_rate_limiter.can (rsi))	1070	if (auth_rate_limiter.can (rsi))
894	{	1071	{
895	auth_req_packet p = (auth_req_packet ) pkt;	1072	auth_req_packet p = (auth_req_packet ) pkt;
896		1073
897	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1074	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
898		1075
899	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1076	if (p->chk_config ()
		1077	&& (!strncmp (p->magic, MAGIC_OLD, 8) \|\| !strncmp (p->magic, MAGIC, 8)))
900	{	1078	{
901	if (p->prot_minor != PROTOCOL_MINOR)	1079	if (p->prot_minor != PROTOCOL_MINOR)
902	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1080	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
903	conf->nodename, (const char *)rsi,	1081	conf->nodename, (const char *)rsi,
904	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1082	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
919	delete octx;	1097	delete octx;
920		1098
921	octx = new crypto_ctx (k, 1);	1099	octx = new crypto_ctx (k, 1);
922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1100	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
923		1101
924	// compatibility code, remove when no longer required
925	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
926
927	conf->protocols = p->protocols;	1102	conf->protocols = p->protocols;
928	features = p->features & FEATURES;	1103	features = p->features & config_packet::get_features ();
929		1104
930	send_auth_response (rsi, p->id, k);	1105	send_auth_response (rsi, p->id, k);
931		1106
932	connection_established ();	1107	connection_established ();
933		1108
934	break;	1109	break;
935	}	1110	}
936	}	1111	}
937	else	1112	else
938	slog (L_WARN, _("%s(%s): protocol mismatch"),	1113	slog (L_WARN, _("%s(%s): protocol mismatch."),
939	conf->nodename, (const char *)rsi);	1114	conf->nodename, (const char *)rsi);
940		1115
941	send_reset (rsi);	1116	send_reset (rsi);
942	}	1117	}
943		1118
944	break;	1119	break;
945		1120
946	case vpn_packet::PT_AUTH_RES:	1121	case vpn_packet::PT_AUTH_RES:
947	{	1122	{
948	auth_res_packet p = (auth_res_packet ) pkt;	1123	auth_res_packet p = (auth_res_packet )pkt;
949		1124
950	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1125	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
951		1126
952	if (p->chk_config ())	1127	if (p->chk_config ())
953	{	1128	{
954	if (p->prot_minor != PROTOCOL_MINOR)	1129	if (p->prot_minor != PROTOCOL_MINOR)
955	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1130	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
958		1133
959	rsachallenge chg;	1134	rsachallenge chg;
960		1135
961	if (!rsa_cache.find (p->id, chg))	1136	if (!rsa_cache.find (p->id, chg))
962	{	1137	{
963	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1138	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
964	conf->nodename, (const char *)rsi);	1139	conf->nodename, (const char *)rsi);
965	break;	1140	break;
966	}	1141	}
967	else	1142	else
968	{	1143	{
969	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1144	crypto_ctx *cctx = new crypto_ctx (chg, 0);
970		1145
971	if (!p->hmac_chk (cctx))	1146	if (!p->hmac_chk (cctx))
972	{	1147	{
973	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1148	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
974	"could be an attack, or just corruption or a synchronization error"),	1149	"could be an attack, or just corruption or a synchronization error."),
975	conf->nodename, (const char *)rsi);	1150	conf->nodename, (const char *)rsi);
976	break;	1151	break;
977	}	1152	}
978	else	1153	else
979	{	1154	{
…		…
990	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1165	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
991		1166
992	si = rsi;	1167	si = rsi;
993	protocol = rsi.prot;	1168	protocol = rsi.prot;
994		1169
		1170	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		1171	conf->nodename, (const char *)rsi,
		1172	is_direct ? "direct" : "forwarded",
		1173	p->prot_major, p->prot_minor);
		1174
995	connection_established ();	1175	connection_established ();
996		1176
997	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
998	conf->nodename, (const char *)rsi,
999	p->prot_major, p->prot_minor);
1000
1001	if (::conf.script_node_up)	1177	if (::conf.script_node_up)
1002	run_script (run_script_cb (this, &connection::script_node_up), false);	1178	{
		1179	run_script_cb *cb = new run_script_cb;
		1180	cb->set<connection, &connection::script_node_up> (this);
		1181	run_script_queued (cb, _("node-up command execution failed, continuing."));
		1182	}
1003		1183
1004	break;	1184	break;
1005	}	1185	}
1006	else	1186	else
1007	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1187	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1008	conf->nodename, (const char *)rsi);	1188	conf->nodename, (const char *)rsi);
1009	}	1189	}
1010		1190
1011	delete cctx;	1191	delete cctx;
1012	}	1192	}
…		…
1028	{	1208	{
1029	vpndata_packet p = (vpndata_packet )pkt;	1209	vpndata_packet p = (vpndata_packet )pkt;
1030		1210
1031	if (!p->hmac_chk (ictx))	1211	if (!p->hmac_chk (ictx))
1032	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1212	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1033	"could be an attack, or just corruption or a synchronization error"),	1213	"could be an attack, or just corruption or a synchronization error."),
1034	conf->nodename, (const char *)rsi);	1214	conf->nodename, (const char *)rsi);
1035	else	1215	else
1036	{	1216	{
1037	u32 seqno;	1217	u32 seqno;
1038	tap_packet *d = p->unpack (this, seqno);	1218	tap_packet *d = p->unpack (this, seqno);
		1219	int seqclass = iseqno.seqno_classify (seqno);
1039		1220
1040	if (iseqno.recv_ok (seqno))	1221	if (seqclass == 0) // ok
1041	{	1222	{
1042	vpn->tap->send (d);	1223	vpn->tap->send (d);
1043		1224
1044	if (si != rsi)	1225	if (si != rsi)
1045	{	1226	{
1046	// fast re-sync on connection changes, useful especially for tcp/ip	1227	// fast re-sync on source address changes, useful especially for tcp/ip
		1228	//if (last_si_change < ev_now () + 5.)
1047	si = rsi;	1229	// {
1048
1049	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1230	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1050	conf->nodename, (const char )si, (const char )rsi);	1231	conf->nodename, (const char )si, (const char )rsi);
		1232
		1233	si = rsi;
		1234
		1235	if (::conf.script_node_change)
		1236	{
		1237	run_script_cb *cb = new run_script_cb;
		1238	cb->set<connection, &connection::script_node_change> (this);
		1239	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1240	}
		1241
		1242	// }
		1243	//else
		1244	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1245	// conf->nodename, (const char )si, (const char )rsi);
1051	}	1246	}
1052
1053	delete d;
1054
1055	break;
1056	}	1247	}
		1248	else if (seqclass == 1) // far history
		1249	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1250	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1251	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1252	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1253	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1254	else if (seqclass == 3) // reset
		1255	{
		1256	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1257	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1258	send_reset (rsi);
		1259	}
		1260
		1261	delete d;
		1262	break;
1057	}	1263	}
1058	}	1264	}
1059		1265
1060	send_reset (rsi);	1266	send_reset (rsi);
1061	break;	1267	break;
1062		1268
1063	case vpn_packet::PT_CONNECT_REQ:	1269	case vpn_packet::PT_CONNECT_REQ:
1064	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1270	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1065	{	1271	{
1066	connect_req_packet p = (connect_req_packet ) pkt;	1272	connect_req_packet p = (connect_req_packet )pkt;
1067		1273
1068	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1274	if (p->id > 0 && p->id <= vpn->conns.size ())
1069	connection *c = vpn->conns[p->id - 1];
1070	conf->protocols = p->protocols;
1071
1072	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1073	conf->id, p->id, c->ictx && c->octx);
1074
1075	if (c->ictx && c->octx)
1076	{	1275	{
		1276	connection *c = vpn->conns[p->id - 1];
		1277	conf->protocols = p->protocols;
		1278
		1279	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
		1280	conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
		1281
		1282	if (c->ictx && c->octx)
		1283	{
1077	// send connect_info packets to both sides, in case one is	1284	// send connect_info packets to both sides, in case one is
1078	// behind a nat firewall (or both ;)	1285	// behind a nat firewall (or both ;)
1079	c->send_connect_info (conf->id, si, conf->protocols);	1286	c->send_connect_info (conf->id, si, conf->protocols);
1080	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1287	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1288	}
		1289	else
		1290	c->establish_connection ();
1081	}	1291	}
1082	else	1292	else
1083	c->establish_connection ();	1293	slog (L_WARN,
		1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1295	p->id);
1084	}	1296	}
1085		1297
1086	break;	1298	break;
1087		1299
1088	case vpn_packet::PT_CONNECT_INFO:	1300	case vpn_packet::PT_CONNECT_INFO:
1089	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1301	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1090	{	1302	{
1091	connect_info_packet p = (connect_info_packet ) pkt;	1303	connect_info_packet p = (connect_info_packet )pkt;
1092		1304
1093	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1305	if (p->id > 0 && p->id <= vpn->conns.size ())
1094		1306	{
1095	connection *c = vpn->conns[p->id - 1];	1307	connection *c = vpn->conns[p->id - 1];
1096		1308
1097	c->conf->protocols = p->protocols;	1309	c->conf->protocols = p->protocols;
1098	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1310	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1099	p->si.upgrade_protocol (protocol, c->conf);	1311	p->si.upgrade_protocol (protocol, c->conf);
1100		1312
1101	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1313	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
		1314	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1102	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1315	(const char *)p->si, !c->ictx && !c->octx);
1103		1316
1104	const sockinfo &dsi = forward_si (p->si);	1317	const sockinfo &dsi = forward_si (p->si);
1105		1318
1106	if (dsi.valid ())	1319	if (dsi.valid ())
1107	c->send_auth_request (dsi, true);	1320	c->send_auth_request (dsi, true);
		1321	}
		1322	else
		1323	slog (L_WARN,
		1324	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1325	p->id);
1108	}	1326	}
1109		1327
1110	break;	1328	break;
1111		1329
1112	default:	1330	default:
1113	send_reset (rsi);	1331	send_reset (rsi);
1114	break;	1332	break;
1115	}	1333	}
1116	}	1334	}
1117		1335
1118	void connection::keepalive_cb (time_watcher &w)	1336	inline void
		1337	connection::keepalive_cb (ev::timer &w, int revents)
1119	{	1338	{
1120	if (NOW >= last_activity + ::conf.keepalive + 30)	1339	if (ev_now () >= last_activity + ::conf.keepalive + 15)
1121	{	1340	{
1122	reset_connection ();	1341	reset_connection ();
1123	establish_connection ();	1342	establish_connection ();
1124	}	1343	}
1125	else if (NOW < last_activity + ::conf.keepalive)	1344	else if (ev_now () < last_activity + ::conf.keepalive)
1126	w.start (last_activity + ::conf.keepalive);	1345	w.start (last_activity + ::conf.keepalive - ev::now ());
1127	else if (conf->connectmode != conf_node::C_ONDEMAND	1346	else if (conf->connectmode != conf_node::C_ONDEMAND
1128	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1347	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1129	{	1348	{
1130	send_ping (si);	1349	send_ping (si);
1131	w.start (NOW + 5);	1350	w.start (3);
1132	}	1351	}
1133	else if (NOW < last_activity + ::conf.keepalive + 10)	1352	else if (ev_now () < last_activity + ::conf.keepalive + 10)
1134	// hold ondemand connections implicitly a few seconds longer	1353	// hold ondemand connections implicitly a few seconds longer
1135	// should delete octx, though, or something like that ;)	1354	// should delete octx, though, or something like that ;)
1136	w.start (last_activity + ::conf.keepalive + 10);	1355	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1137	else	1356	else
1138	reset_connection ();	1357	reset_connection ();
1139	}	1358	}
1140		1359
		1360	void
1141	void connection::send_connect_request (int id)	1361	connection::send_connect_request (int id)
1142	{	1362	{
1143	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1363	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1144		1364
1145	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1365	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
		1366	conf->nodename, vpn->conns[id - 1]->conf->nodename);
1146	p->hmac_set (octx);	1367	p->hmac_set (octx);
1147	send_vpn_packet (p, si);	1368	send_vpn_packet (p, si);
1148		1369
1149	delete p;	1370	delete p;
1150	}	1371	}
1151		1372
1152	void connection::script_node ()	1373	void
		1374	connection::script_init_env (const char *ext)
1153	{	1375	{
1154	vpn->script_if_up ();
1155
1156	char *env;	1376	char *env;
		1377	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1378	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1379	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1380	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1381	conf->id & 0xff); putenv (env);
		1382	}
		1383
		1384	void
		1385	connection::script_init_connect_env ()
		1386	{
		1387	vpn->script_init_env ();
		1388
		1389	char *env;
1157	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1390	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1391	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1158	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1392	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1159	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1393	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1160	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1394	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1161	}	1395	}
1162		1396
		1397	inline const char *
1163	const char *connection::script_node_up ()	1398	connection::script_node_up ()
1164	{	1399	{
1165	script_node ();	1400	script_init_connect_env ();
1166		1401
1167	putenv ("STATE=up");	1402	putenv ((char *)"STATE=up");
1168		1403
		1404	char *filename;
		1405	asprintf (&filename,
		1406	"%s/%s",
		1407	confbase,
1169	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1408	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1170	}
1171		1409
		1410	return filename;
		1411	}
		1412
		1413	inline const char *
		1414	connection::script_node_change ()
		1415	{
		1416	script_init_connect_env ();
		1417
		1418	putenv ((char *)"STATE=change");
		1419
		1420	char *filename;
		1421	asprintf (&filename,
		1422	"%s/%s",
		1423	confbase,
		1424	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1425
		1426	return filename;
		1427	}
		1428
		1429	inline const char *
1172	const char *connection::script_node_down ()	1430	connection::script_node_down ()
1173	{	1431	{
1174	script_node ();	1432	script_init_connect_env ();
1175		1433
1176	putenv ("STATE=down");	1434	putenv ((char *)"STATE=down");
1177		1435
1178	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1436	char *filename;
1179	}	1437	asprintf (&filename,
		1438	"%s/%s",
		1439	confbase,
		1440	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1180		1441
		1442	return filename;
		1443	}
		1444
1181	connection::connection(struct vpn *vpn_)	1445	connection::connection (struct vpn vpn, conf_node conf)
1182	: vpn(vpn_)	1446	: vpn(vpn), conf(conf),
1183	, rekey (this, &connection::rekey_cb)	1447	#if ENABLE_DNS
1184	, keepalive (this, &connection::keepalive_cb)	1448	dns (0),
		1449	#endif
		1450	data_queue(conf->max_ttl, conf->max_queue + 1),
		1451	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1452	{
		1453	rekey .set<connection, &connection::rekey_cb > (this);
		1454	keepalive .set<connection, &connection::keepalive_cb > (this);
1185	, establish_connection (this, &connection::establish_connection_cb)	1455	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1186	{	1456
		1457	last_establish_attempt = 0.;
1187	octx = ictx = 0;	1458	octx = ictx = 0;
1188	retry_cnt = 0;
1189		1459
1190	connectmode = conf_node::C_ALWAYS; // initial setting	1460	if (!conf->protocols) // make sure some protocol is enabled
		1461	conf->protocols = PROT_UDPv4;
		1462
		1463	connectmode = conf->connectmode;
		1464
		1465	// queue a dummy packet to force an initial connection attempt
		1466	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1467	vpn_queue.put (new net_packet);
		1468
1191	reset_connection ();	1469	reset_connection ();
1192	}	1470	}
1193		1471
1194	connection::~connection ()	1472	connection::~connection ()
1195	{	1473	{
1196	shutdown ();	1474	shutdown ();
1197	}	1475	}
1198		1476
		1477	void
1199	void connection_init ()	1478	connection_init ()
1200	{	1479	{
1201	auth_rate_limiter.clear ();	1480	auth_rate_limiter.clear ();
1202	reset_rate_limiter.clear ();	1481	reset_rate_limiter.clear ();
1203	}	1482	}
1204		1483

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Comparing gvpe/src/connection.C (file contents): Revision 1.31 by pcg, Sun Feb 8 07:24:25 2004 UTC vs. Revision 1.92 by root, Thu Feb 10 03:59:51 2011 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.31 by pcg, Sun Feb 8 07:24:25 2004 UTC vs.
Revision 1.92 by root, Thu Feb 10 03:59:51 2011 UTC