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

Comparing gvpe/src/connection.C (file contents):
Revision 1.30 by pcg, Thu Jan 29 19:22:05 2004 UTC vs.
Revision 1.93 by root, Tue Feb 15 13:31:23 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) 2003-2008,2010,2011 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	#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;
335	int outl = 0, outl2;	434	int outl = 0, outl2;
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	u32 cl;
341		439
		440	if (conn->features & FEATURE_COMPRESSION)
		441	{
342	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	442	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		443
343	if (cl)	444	if (cl)
344	{	445	{
345	type = PT_DATA_COMPRESSED;	446	type = PT_DATA_COMPRESSED;
346	d = cdata;	447	d = cdata;
347	l = cl + 2;	448	l = cl + 2;
348		449
349	d[0] = cl >> 8;	450	d[0] = cl >> 8;
350	d[1] = cl;	451	d[1] = cl;
		452	}
351	}	453	}
352	#endif	454	#endif
353		455
354	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	456	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
355		457
…		…
448	{	550	{
449	// actually, hmaclen cannot be checked because the hmac	551	// actually, hmaclen cannot be checked because the hmac
450	// field comes before this data, so peers with other	552	// field comes before this data, so peers with other
451	// hmacs simply will not work.	553	// hmacs simply will not work.
452	u8 prot_major, prot_minor, randsize, hmaclen;	554	u8 prot_major, prot_minor, randsize, hmaclen;
453	u8 flags, challengelen, pad2, pad3;	555	u8 flags, challengelen, features, pad3;
454	u32 cipher_nid, digest_nid, hmac_nid;	556	u32 cipher_nid, digest_nid, hmac_nid;
455
456	const u8 curflags () const
457	{
458	return 0x80
459	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
460	}
461		557
462	void setup (ptype type, int dst);	558	void setup (ptype type, int dst);
463	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	}
464	};	575	};
465		576
		577	void
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 = curflags ();	584	flags = 0;
473	challengelen = sizeof (rsachallenge);	585	challengelen = sizeof (rsachallenge);
		586	features = get_features ();
474		587
475	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	588	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
476	digest_nid = htonl (EVP_MD_type (RSA_HASH));	589	digest_nid = htonl (EVP_MD_type (RSA_HASH));
477	hmac_nid = htonl (EVP_MD_type (DIGEST));	590	hmac_nid = htonl (EVP_MD_type (DIGEST));
478		591
479	len = sizeof (*this) - sizeof (net_packet);	592	len = sizeof (*this) - sizeof (net_packet);
480	set_hdr (type, dst);	593	set_hdr (type, dst);
481	}	594	}
482		595
		596	bool
483	bool config_packet::chk_config () const	597	config_packet::chk_config () const
484	{	598	{
485	if (prot_major != PROTOCOL_MAJOR)	599	if (prot_major != PROTOCOL_MAJOR)
486	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);
487	else if (randsize != RAND_SIZE)	601	else if (randsize != RAND_SIZE)
488	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);
489	else if (hmaclen != HMACLENGTH)	603	else if (hmaclen != HMACLENGTH)
490	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);
491	else if (flags != curflags ())
492	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
493	else if (challengelen != sizeof (rsachallenge))	605	else if (challengelen != sizeof (rsachallenge))
494	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));
495	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	607	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
496	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));
497	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	609	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
…		…
514	rsaencrdata encr;	626	rsaencrdata encr;
515		627
516	auth_req_packet (int dst, bool initiate_, u8 protocols_)	628	auth_req_packet (int dst, bool initiate_, u8 protocols_)
517	{	629	{
518	config_packet::setup (PT_AUTH_REQ, dst);	630	config_packet::setup (PT_AUTH_REQ, dst);
519	strncpy (magic, MAGIC, 8);	631	strncpy (magic, MAGIC_OLD, 8);
520	initiate = !!initiate_;	632	initiate = !!initiate_;
521	protocols = protocols_;	633	protocols = protocols_;
522		634
523	len = sizeof (*this) - sizeof (net_packet);	635	len = sizeof (*this) - sizeof (net_packet);
524	}	636	}
…		…
573	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
574		686
575	void	687	void
576	connection::connection_established ()	688	connection::connection_established ()
577	{	689	{
		690	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		691
578	if (ictx && octx)	692	if (ictx && octx)
579	{	693	{
580	connectmode = conf->connectmode;	694	// make sure rekeying timeouts are slightly asymmetric
581		695	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
582	rekey.start (NOW + ::conf.rekey);	696	rekey.start (rekey_interval, rekey_interval);
583	keepalive.start (NOW + ::conf.keepalive);	697	keepalive.start (::conf.keepalive);
584		698
585	// send queued packets	699	// send queued packets
586	if (ictx && octx)	700	if (ictx && octx)
587	{	701	{
588	while (tap_packet p = (tap_packet )data_queue.get ())	702	while (tap_packet p = (tap_packet )data_queue.get ())
589	{	703	{
590	send_data_packet (p);	704	if (p->len) send_data_packet (p);
591	delete p;	705	delete p;
592	}	706	}
593		707
594	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	708	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
595	{	709	{
596	send_vpn_packet (p, si, IPTOS_RELIABILITY);	710	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
597	delete p;	711	delete p;
598	}	712	}
599	}	713	}
		714
		715	vpn->connection_established (this);
600	}	716	}
601	else	717	else
602	{	718	{
603	retry_cnt = 0;	719	retry_cnt = 0;
604	establish_connection.start (NOW + 5);	720	establish_connection.start (5);
605	keepalive.stop ();	721	keepalive.stop ();
606	rekey.stop ();	722	rekey.stop ();
607	}	723	}
608	}	724	}
609		725
610	void	726	void
611	connection::reset_si ()	727	connection::reset_si ()
612	{	728	{
		729	if (vpn->can_direct (THISNODE, conf))
613	protocol = best_protocol (THISNODE->protocols & conf->protocols);	730	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
614		731	else
615	// mask out protocols we cannot establish	732	{
616	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	733	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
617	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	734	protocol = 0;
		735	}
618		736
619	si.set (conf, protocol);	737	si.set (conf, protocol);
		738
		739	is_direct = si.valid ();
620	}	740	}
621		741
622	// ensure sockinfo is valid, forward if necessary	742	// ensure sockinfo is valid, forward if necessary
623	const sockinfo &	743	const sockinfo &
624	connection::forward_si (const sockinfo &si) const	744	connection::forward_si (const sockinfo &si) const
625	{	745	{
626	if (!si.valid ())	746	if (!si.valid ())
627	{	747	{
628	connection *r = vpn->find_router ();	748	connection *r = vpn->find_router_for (this);
629		749
630	if (r)	750	if (r)
631	{	751	{
632	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	752	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
633	conf->nodename, r->conf->nodename);	753	conf->nodename, r->conf->nodename);
634	return r->si;	754	return r->si;
635	}	755	}
636	else	756	else
637	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	757	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
638	conf->nodename);	758	conf->nodename);
639	}	759	}
640		760
641	return si;	761	return si;
642	}	762	}
…		…
652	connection::send_ping (const sockinfo &si, u8 pong)	772	connection::send_ping (const sockinfo &si, u8 pong)
653	{	773	{
654	ping_packet *pkt = new ping_packet;	774	ping_packet *pkt = new ping_packet;
655		775
656	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
657	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	780	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
658		781
659	delete pkt;	782	delete pkt;
660	}	783	}
661		784
…		…
680		803
681	rsachallenge chg;	804	rsachallenge chg;
682	rsa_cache.gen (pkt->id, chg);	805	rsa_cache.gen (pkt->id, chg);
683	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	806	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
684		807
685	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);
686		809
687	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
688		811
689	delete pkt;	812	delete pkt;
690	}	813	}
…		…
698		821
699	rsa_hash (id, chg, pkt->response);	822	rsa_hash (id, chg, pkt->response);
700		823
701	pkt->hmac_set (octx);	824	pkt->hmac_set (octx);
702		825
703	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);
704		827
705	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
706		829
707	delete pkt;	830	delete pkt;
708	}	831	}
709		832
710	void	833	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	834	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	835	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	836	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	837	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		838	conf->protocols);
715		839
716	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	840	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717		841
718	r->hmac_set (octx);	842	r->hmac_set (octx);
719	send_vpn_packet (r, si);	843	send_vpn_packet (r, si);
720		844
721	delete r;	845	delete r;
722	}	846	}
723		847
724	void	848	inline void
725	connection::establish_connection_cb (time_watcher &w)	849	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	850	{
727	if (!ictx	851	if (!(ictx && octx)
728	&& conf != THISNODE	852	&& conf != THISNODE
729	&& connectmode != conf_node::C_NEVER	853	&& connectmode != conf_node::C_NEVER
730	&& connectmode != conf_node::C_DISABLED	854	&& connectmode != conf_node::C_DISABLED
731	&& NOW > w.at)	855	&& !w.is_active ())
732	{	856	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	857	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		858	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	859	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		860	{
		861	reset_connection ();
736	retry_cnt++;	862	return;
		863	}
737		864
738	w.start (NOW + retry_int);	865	last_establish_attempt = ev_now ();
		866
		867	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		868	? (retry_cnt & 3) + 1
		869	: 1 << (retry_cnt >> 2));
739		870
740	reset_si ();	871	reset_si ();
741		872
742	if (si.prot && !si.host)	873	bool slow = si.prot & PROT_SLOW;
		874
		875	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		876	{
		877	/TODO/ /* start the timer so we don't recurse endlessly */
		878	w.start (1);
743	vpn->send_connect_request (conf->id);	879	vpn->send_connect_request (this);
		880	}
744	else	881	else
745	{	882	{
		883	if (si.valid ())
		884	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		885	conf->nodename, (const char *)si);
		886
746	const sockinfo &dsi = forward_si (si);	887	const sockinfo &dsi = forward_si (si);
		888
		889	slow = slow \|\| (dsi.prot & PROT_SLOW);
747		890
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	891	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	892	{
750	if (retry_cnt < 4)	893	if (retry_cnt < 4)
751	send_auth_request (dsi, true);	894	send_auth_request (dsi, true);
752	else	895	else
753	send_ping (dsi, 0);	896	send_ping (dsi, 0);
754	}	897	}
755	}	898	}
		899
		900	retry_int *= slow ? 8. : 0.9;
		901
		902	if (retry_int < conf->max_retry)
		903	retry_cnt++;
		904	else
		905	retry_int = conf->max_retry;
		906
		907	w.start (retry_int);
756	}	908	}
757	}	909	}
758		910
759	void	911	void
760	connection::reset_connection ()	912	connection::reset_connection ()
…		…
763	{	915	{
764	slog (L_INFO, _("%s(%s): connection lost"),	916	slog (L_INFO, _("%s(%s): connection lost"),
765	conf->nodename, (const char *)si);	917	conf->nodename, (const char *)si);
766		918
767	if (::conf.script_node_down)	919	if (::conf.script_node_down)
768	run_script (run_script_cb (this, &connection::script_node_down), false);	920	{
		921	run_script_cb *cb = new run_script_cb;
		922	cb->set<connection, &connection::script_node_down> (this);
		923	run_script_queued (cb, _("node-down command execution failed, continuing."));
		924	}
769	}	925	}
770		926
771	delete ictx; ictx = 0;	927	delete ictx; ictx = 0;
772	delete octx; octx = 0;	928	delete octx; octx = 0;
		929	#if ENABLE_DNS
		930	dnsv4_reset_connection ();
		931	#endif
773		932
774	si.host= 0;	933	si.host = 0;
775		934
776	last_activity = 0;	935	last_activity = 0.;
		936	//last_si_change = 0.;
777	retry_cnt = 0;	937	retry_cnt = 0;
778		938
779	rekey.stop ();	939	rekey.stop ();
780	keepalive.stop ();	940	keepalive.stop ();
781	establish_connection.stop ();	941	establish_connection.stop ();
…		…
788	send_reset (si);	948	send_reset (si);
789		949
790	reset_connection ();	950	reset_connection ();
791	}	951	}
792		952
793	void	953	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	954	inline void
		955	connection::rekey_cb (ev::timer &w, int revents)
795	{	956	{
796	reset_connection ();	957	reset_connection ();
797	establish_connection ();	958	establish_connection ();
798	}	959	}
799		960
…		…
815	if (oseqno > MAX_SEQNO)	976	if (oseqno > MAX_SEQNO)
816	rekey ();	977	rekey ();
817	}	978	}
818		979
819	void	980	void
		981	connection::post_inject_queue ()
		982	{
		983	// force a connection every now and when when packets are sent (max 1/s)
		984	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		985	establish_connection.stop ();
		986
		987	establish_connection ();
		988	}
		989
		990	void
820	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	991	connection::inject_data_packet (tap_packet *pkt)
821	{	992	{
822	if (ictx && octx)	993	if (ictx && octx)
823	send_data_packet (pkt);	994	send_data_packet (pkt);
824	else	995	else
825	{	996	{
826	if (!broadcast)//DDDD
827	data_queue.put (new tap_packet (*pkt));	997	data_queue.put (new tap_packet (*pkt));
828		998	post_inject_queue ();
829	establish_connection ();
830	}	999	}
831	}	1000	}
832		1001
		1002	void
833	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1003	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
834	{	1004	{
835	if (ictx && octx)	1005	if (ictx && octx)
836	send_vpn_packet (pkt, si, tos);	1006	send_vpn_packet (pkt, si, tos);
837	else	1007	else
838	{	1008	{
839	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1009	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
840		1010	post_inject_queue ();
841	establish_connection ();
842	}	1011	}
843	}	1012	}
844		1013
845	void	1014	void
846	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1015	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
847	{	1016	{
848	last_activity = NOW;	1017	last_activity = ev_now ();
849		1018
850	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1019	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
851	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1020	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1021
		1022	if (connectmode == conf_node::C_DISABLED)
		1023	return;
852		1024
853	switch (pkt->typ ())	1025	switch (pkt->typ ())
854	{	1026	{
855	case vpn_packet::PT_PING:	1027	case vpn_packet::PT_PING:
		1028	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1029
856	// we send pings instead of auth packets after some retries,	1030	// we send pings instead of auth packets after some retries,
857	// so reset the retry counter and establish a connection	1031	// so reset the retry counter and establish a connection
858	// when we receive a ping.	1032	// when we receive a ping.
859	if (!ictx)	1033	if (!ictx)
860	{	1034	{
861	if (auth_rate_limiter.can (rsi))	1035	if (auth_rate_limiter.can (rsi))
862	send_auth_request (rsi, true);	1036	send_auth_request (rsi, true);
863	}	1037	}
864	else	1038	else
		1039	// we would love to change the socket address here, but ping's aren't
		1040	// authenticated, so we best ignore it.
865	send_ping (rsi, 1); // pong	1041	send_ping (rsi, 1); // pong
866		1042
867	break;	1043	break;
868		1044
869	case vpn_packet::PT_PONG:	1045	case vpn_packet::PT_PONG:
		1046	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1047
		1048	// a PONG might mean that the other side doesn't really know
		1049	// about our desire for communication.
		1050	establish_connection ();
870	break;	1051	break;
871		1052
872	case vpn_packet::PT_RESET:	1053	case vpn_packet::PT_RESET:
873	{	1054	{
874	reset_connection ();	1055	reset_connection ();
875		1056
876	config_packet p = (config_packet ) pkt;	1057	config_packet p = (config_packet ) pkt;
877		1058
878	if (!p->chk_config ())	1059	if (!p->chk_config ())
879	{	1060	{
880	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1061	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
881	conf->nodename, (const char *)rsi);	1062	conf->nodename, (const char *)rsi);
882	connectmode = conf_node::C_DISABLED;	1063	connectmode = conf_node::C_DISABLED;
883	}	1064	}
884	else if (connectmode == conf_node::C_ALWAYS)	1065	else if (connectmode == conf_node::C_ALWAYS)
885	establish_connection ();	1066	establish_connection ();
…		…
887	break;	1068	break;
888		1069
889	case vpn_packet::PT_AUTH_REQ:	1070	case vpn_packet::PT_AUTH_REQ:
890	if (auth_rate_limiter.can (rsi))	1071	if (auth_rate_limiter.can (rsi))
891	{	1072	{
892	auth_req_packet p = (auth_req_packet ) pkt;	1073	auth_req_packet p = (auth_req_packet )pkt;
893		1074
894	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1075	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1076	conf->nodename, p->initiate ? "initiate" : "reply",
		1077	p->protocols, p->features);
895		1078
896	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1079	if (p->chk_config ()
		1080	&& (!memcmp (p->magic, MAGIC_OLD, 8) \|\| !memcmp (p->magic, MAGIC, 8)))
897	{	1081	{
898	if (p->prot_minor != PROTOCOL_MINOR)	1082	if (p->prot_minor != PROTOCOL_MINOR)
899	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1083	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
900	conf->nodename, (const char *)rsi,	1084	conf->nodename, (const char *)rsi,
901	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1085	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
917		1101
918	octx = new crypto_ctx (k, 1);	1102	octx = new crypto_ctx (k, 1);
919	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1103	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
920		1104
921	conf->protocols = p->protocols;	1105	conf->protocols = p->protocols;
		1106	features = p->features & config_packet::get_features ();
922		1107
923	send_auth_response (rsi, p->id, k);	1108	send_auth_response (rsi, p->id, k);
924		1109
925	connection_established ();	1110	connection_established ();
926		1111
927	break;	1112	break;
928	}	1113	}
929	}	1114	}
930	else	1115	else
931	slog (L_WARN, _("%s(%s): protocol mismatch"),	1116	slog (L_WARN, _("%s(%s): protocol mismatch."),
932	conf->nodename, (const char *)rsi);	1117	conf->nodename, (const char *)rsi);
933		1118
934	send_reset (rsi);	1119	send_reset (rsi);
935	}	1120	}
936		1121
937	break;	1122	break;
938		1123
939	case vpn_packet::PT_AUTH_RES:	1124	case vpn_packet::PT_AUTH_RES:
940	{	1125	{
941	auth_res_packet p = (auth_res_packet ) pkt;	1126	auth_res_packet p = (auth_res_packet )pkt;
942		1127
943	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1128	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
944		1129
945	if (p->chk_config ())	1130	if (p->chk_config ())
946	{	1131	{
947	if (p->prot_minor != PROTOCOL_MINOR)	1132	if (p->prot_minor != PROTOCOL_MINOR)
948	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1133	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
951		1136
952	rsachallenge chg;	1137	rsachallenge chg;
953		1138
954	if (!rsa_cache.find (p->id, chg))	1139	if (!rsa_cache.find (p->id, chg))
955	{	1140	{
956	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1141	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
957	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
958	break;	1143	break;
959	}	1144	}
960	else	1145	else
961	{	1146	{
962	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1147	crypto_ctx *cctx = new crypto_ctx (chg, 0);
963		1148
964	if (!p->hmac_chk (cctx))	1149	if (!p->hmac_chk (cctx))
965	{	1150	{
966	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1151	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
967	"could be an attack, or just corruption or a synchronization error"),	1152	"could be an attack, or just corruption or a synchronization error."),
968	conf->nodename, (const char *)rsi);	1153	conf->nodename, (const char *)rsi);
969	break;	1154	break;
970	}	1155	}
971	else	1156	else
972	{	1157	{
…		…
983	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1168	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984		1169
985	si = rsi;	1170	si = rsi;
986	protocol = rsi.prot;	1171	protocol = rsi.prot;
987		1172
		1173	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		1174	conf->nodename, (const char *)rsi,
		1175	is_direct ? "direct" : "forwarded",
		1176	p->prot_major, p->prot_minor);
		1177
988	connection_established ();	1178	connection_established ();
989		1179
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)	1180	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);	1181	{
		1182	run_script_cb *cb = new run_script_cb;
		1183	cb->set<connection, &connection::script_node_up> (this);
		1184	run_script_queued (cb, _("node-up command execution failed, continuing."));
		1185	}
996		1186
997	break;	1187	break;
998	}	1188	}
999	else	1189	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1190	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
1001	conf->nodename, (const char *)rsi);	1191	conf->nodename, (const char *)rsi);
1002	}	1192	}
1003		1193
1004	delete cctx;	1194	delete cctx;
1005	}	1195	}
…		…
1021	{	1211	{
1022	vpndata_packet p = (vpndata_packet )pkt;	1212	vpndata_packet p = (vpndata_packet )pkt;
1023		1213
1024	if (!p->hmac_chk (ictx))	1214	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1215	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or a synchronization error"),	1216	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1217	conf->nodename, (const char *)rsi);
1028	else	1218	else
1029	{	1219	{
1030	u32 seqno;	1220	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1221	tap_packet *d = p->unpack (this, seqno);
		1222	int seqclass = iseqno.seqno_classify (seqno);
1032		1223
1033	if (iseqno.recv_ok (seqno))	1224	if (seqclass == 0) // ok
1034	{	1225	{
1035	vpn->tap->send (d);	1226	vpn->tap->send (d);
1036		1227
1037	if (si != rsi)	1228	if (si != rsi)
1038	{	1229	{
1039	// fast re-sync on connection changes, useful especially for tcp/ip	1230	// fast re-sync on source address changes, useful especially for tcp/ip
		1231	//if (last_si_change < ev_now () + 5.)
1040	si = rsi;	1232	// {
1041
1042	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1233	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1043	conf->nodename, (const char )si, (const char )rsi);	1234	conf->nodename, (const char )si, (const char )rsi);
		1235
		1236	si = rsi;
		1237
		1238	if (::conf.script_node_change)
		1239	{
		1240	run_script_cb *cb = new run_script_cb;
		1241	cb->set<connection, &connection::script_node_change> (this);
		1242	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1243	}
		1244
		1245	// }
		1246	//else
		1247	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1248	// conf->nodename, (const char )si, (const char )rsi);
1044	}	1249	}
1045
1046	delete d;
1047
1048	break;
1049	}	1250	}
		1251	else if (seqclass == 1) // far history
		1252	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1253	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1254	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1255	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1256	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1257	else if (seqclass == 3) // reset
		1258	{
		1259	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1260	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1261	send_reset (rsi);
		1262	}
		1263
		1264	delete d;
		1265	break;
1050	}	1266	}
1051	}	1267	}
1052		1268
1053	send_reset (rsi);	1269	send_reset (rsi);
1054	break;	1270	break;
1055		1271
1056	case vpn_packet::PT_CONNECT_REQ:	1272	case vpn_packet::PT_CONNECT_REQ:
1057	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1273	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1058	{	1274	{
1059	connect_req_packet p = (connect_req_packet ) pkt;	1275	connect_req_packet p = (connect_req_packet )pkt;
1060		1276
1061	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1277	if (p->id > 0 && p->id <= vpn->conns.size ())
1062	connection *c = vpn->conns[p->id - 1];
1063	conf->protocols = p->protocols;
1064
1065	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1066	conf->id, p->id, c->ictx && c->octx);
1067
1068	if (c->ictx && c->octx)
1069	{	1278	{
		1279	connection *c = vpn->conns[p->id - 1];
		1280	conf->protocols = p->protocols;
		1281
		1282	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1283	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1284	p->protocols,
		1285	c->ictx && c->octx);
		1286
		1287	if (c->ictx && c->octx)
		1288	{
1070	// send connect_info packets to both sides, in case one is	1289	// send connect_info packets to both sides, in case one is
1071	// behind a nat firewall (or both ;)	1290	// behind a nat firewall (or both ;)
1072	c->send_connect_info (conf->id, si, conf->protocols);	1291	c->send_connect_info (conf->id, si, conf->protocols);
1073	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1292	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1293	}
		1294	else
		1295	c->establish_connection ();
1074	}	1296	}
1075	else	1297	else
1076	c->establish_connection ();	1298	slog (L_WARN,
		1299	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1300	p->id);
1077	}	1301	}
1078		1302
1079	break;	1303	break;
1080		1304
1081	case vpn_packet::PT_CONNECT_INFO:	1305	case vpn_packet::PT_CONNECT_INFO:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1306	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1307	{
1084	connect_info_packet p = (connect_info_packet ) pkt;	1308	connect_info_packet p = (connect_info_packet )pkt;
1085		1309
1086	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1310	if (p->id > 0 && p->id <= vpn->conns.size ())
1087		1311	{
1088	connection *c = vpn->conns[p->id - 1];	1312	connection *c = vpn->conns[p->id - 1];
1089		1313
1090	c->conf->protocols = p->protocols;	1314	c->conf->protocols = p->protocols;
1091	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1315	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1092	p->si.upgrade_protocol (protocol, c->conf);	1316	p->si.upgrade_protocol (protocol, c->conf);
1093		1317
1094	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1318	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,p%02x) [%d]",
1095	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1319	conf->nodename,
		1320	vpn->conns[p->id - 1]->conf->nodename,
		1321	(const char *)p->si,
		1322	p->protocols,
		1323	!c->ictx && !c->octx);
1096		1324
1097	const sockinfo &dsi = forward_si (p->si);	1325	const sockinfo &dsi = forward_si (p->si);
1098		1326
1099	if (dsi.valid ())	1327	if (dsi.valid ())
1100	c->send_auth_request (dsi, true);	1328	c->send_auth_request (dsi, true);
		1329	}
		1330	else
		1331	slog (L_WARN,
		1332	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1333	p->id);
1101	}	1334	}
1102		1335
1103	break;	1336	break;
1104		1337
1105	default:	1338	default:
1106	send_reset (rsi);	1339	send_reset (rsi);
1107	break;	1340	break;
1108	}	1341	}
1109	}	1342	}
1110		1343
1111	void connection::keepalive_cb (time_watcher &w)	1344	inline void
		1345	connection::keepalive_cb (ev::timer &w, int revents)
1112	{	1346	{
1113	if (NOW >= last_activity + ::conf.keepalive + 30)	1347	if (ev_now () >= last_activity + ::conf.keepalive + 15)
1114	{	1348	{
1115	reset_connection ();	1349	reset_connection ();
1116	establish_connection ();	1350	establish_connection ();
1117	}	1351	}
1118	else if (NOW < last_activity + ::conf.keepalive)	1352	else if (ev_now () < last_activity + ::conf.keepalive)
1119	w.start (last_activity + ::conf.keepalive);	1353	w.start (last_activity + ::conf.keepalive - ev::now ());
1120	else if (conf->connectmode != conf_node::C_ONDEMAND	1354	else if (conf->connectmode != conf_node::C_ONDEMAND
1121	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1355	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1122	{	1356	{
1123	send_ping (si);	1357	send_ping (si);
1124	w.start (NOW + 5);	1358	w.start (3);
1125	}	1359	}
1126	else if (NOW < last_activity + ::conf.keepalive + 10)	1360	else if (ev_now () < last_activity + ::conf.keepalive + 10)
1127	// hold ondemand connections implicitly a few seconds longer	1361	// hold ondemand connections implicitly a few seconds longer
1128	// should delete octx, though, or something like that ;)	1362	// should delete octx, though, or something like that ;)
1129	w.start (last_activity + ::conf.keepalive + 10);	1363	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1130	else	1364	else
1131	reset_connection ();	1365	reset_connection ();
1132	}	1366	}
1133		1367
		1368	void
1134	void connection::send_connect_request (int id)	1369	connection::send_connect_request (int id)
1135	{	1370	{
1136	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1371	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1137		1372
1138	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1373	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1374	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1375	THISNODE->protocols);
1139	p->hmac_set (octx);	1376	p->hmac_set (octx);
1140	send_vpn_packet (p, si);	1377	send_vpn_packet (p, si);
1141		1378
1142	delete p;	1379	delete p;
1143	}	1380	}
1144		1381
1145	void connection::script_node ()	1382	void
		1383	connection::script_init_env (const char *ext)
1146	{	1384	{
1147	vpn->script_if_up ();
1148
1149	char *env;	1385	char *env;
		1386	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1387	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1388	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1389	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1390	conf->id & 0xff); putenv (env);
		1391	}
		1392
		1393	void
		1394	connection::script_init_connect_env ()
		1395	{
		1396	vpn->script_init_env ();
		1397
		1398	char *env;
1150	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1399	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1400	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1151	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1401	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1152	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1402	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1153	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1403	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1154	}	1404	}
1155		1405
		1406	inline const char *
1156	const char *connection::script_node_up ()	1407	connection::script_node_up ()
1157	{	1408	{
1158	script_node ();	1409	script_init_connect_env ();
1159		1410
1160	putenv ("STATE=up");	1411	putenv ((char *)"STATE=up");
1161		1412
		1413	char *filename;
		1414	asprintf (&filename,
		1415	"%s/%s",
		1416	confbase,
1162	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1417	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1163	}
1164		1418
		1419	return filename;
		1420	}
		1421
		1422	inline const char *
		1423	connection::script_node_change ()
		1424	{
		1425	script_init_connect_env ();
		1426
		1427	putenv ((char *)"STATE=change");
		1428
		1429	char *filename;
		1430	asprintf (&filename,
		1431	"%s/%s",
		1432	confbase,
		1433	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1434
		1435	return filename;
		1436	}
		1437
		1438	inline const char *
1165	const char *connection::script_node_down ()	1439	connection::script_node_down ()
1166	{	1440	{
1167	script_node ();	1441	script_init_connect_env ();
1168		1442
1169	putenv ("STATE=down");	1443	putenv ((char *)"STATE=down");
1170		1444
1171	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1445	char *filename;
1172	}	1446	asprintf (&filename,
		1447	"%s/%s",
		1448	confbase,
		1449	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1173		1450
		1451	return filename;
		1452	}
		1453
1174	connection::connection(struct vpn *vpn_)	1454	connection::connection (struct vpn vpn, conf_node conf)
1175	: vpn(vpn_)	1455	: vpn(vpn), conf(conf),
1176	, rekey (this, &connection::rekey_cb)	1456	#if ENABLE_DNS
1177	, keepalive (this, &connection::keepalive_cb)	1457	dns (0),
		1458	#endif
		1459	data_queue(conf->max_ttl, conf->max_queue + 1),
		1460	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1461	{
		1462	rekey .set<connection, &connection::rekey_cb > (this);
		1463	keepalive .set<connection, &connection::keepalive_cb > (this);
1178	, establish_connection (this, &connection::establish_connection_cb)	1464	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1179	{	1465
		1466	last_establish_attempt = 0.;
1180	octx = ictx = 0;	1467	octx = ictx = 0;
1181	retry_cnt = 0;
1182		1468
1183	connectmode = conf_node::C_ALWAYS; // initial setting	1469	connectmode = conf->connectmode;
		1470
		1471	// queue a dummy packet to force an initial connection attempt
		1472	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1473	vpn_queue.put (new net_packet);
		1474
1184	reset_connection ();	1475	reset_connection ();
1185	}	1476	}
1186		1477
1187	connection::~connection ()	1478	connection::~connection ()
1188	{	1479	{
1189	shutdown ();	1480	shutdown ();
1190	}	1481	}
1191		1482
		1483	void
1192	void connection_init ()	1484	connection_init ()
1193	{	1485	{
1194	auth_rate_limiter.clear ();	1486	auth_rate_limiter.clear ();
1195	reset_rate_limiter.clear ();	1487	reset_rate_limiter.clear ();
1196	}	1488	}
1197		1489

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Comparing gvpe/src/connection.C (file contents): Revision 1.30 by pcg, Thu Jan 29 19:22:05 2004 UTC vs. Revision 1.93 by root, Tue Feb 15 13:31:23 2011 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.30 by pcg, Thu Jan 29 19:22:05 2004 UTC vs.
Revision 1.93 by root, Tue Feb 15 13:31:23 2011 UTC