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

Comparing gvpe/src/connection.C (file contents):
Revision 1.8 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.79 by pcg, Fri Aug 15 17:45:12 2008 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
5	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
39		48
		49	#include "netcompat.h"
		50
40	#if !HAVE_RAND_PSEUDO_BYTES	51	#if !HAVE_RAND_PSEUDO_BYTES
41	# define RAND_pseudo_bytes RAND_bytes	52	# define RAND_pseudo_bytes RAND_bytes
42	#endif	53	#endif
43		54
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	55	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
45		56
		57	#define ULTRA_FAST 1
		58	#define HLOG 15
		59	#include "lzf/lzf.h"
		60	#include "lzf/lzf_c.c"
		61	#include "lzf/lzf_d.c"
		62
		63	//////////////////////////////////////////////////////////////////////////////
		64
		65	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		66	static ev::child rs_child_ev;
		67
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88
		89	// despite the fancy name, this is quite a hack
		90	static void
		91	run_script_queued (run_script_cb cb, const char warnmsg)
		92	{
		93	rs_queue.push (std::make_pair (cb, warnmsg));
		94
		95	if (!rs_child_ev.is_active ())
		96	{
		97	rs_child_ev.set<rs_child_cb> ();
		98	rs_child_ev ();
		99	}
		100	}
		101
		102	//////////////////////////////////////////////////////////////////////////////
		103
46	struct crypto_ctx	104	struct crypto_ctx
47	{	105	{
48	EVP_CIPHER_CTX cctx;	106	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	107	HMAC_CTX hctx;
50		108
53	};	111	};
54		112
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	113	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
56	{	114	{
57	EVP_CIPHER_CTX_init (&cctx);	115	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	116	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
59	HMAC_CTX_init (&hctx);	117	HMAC_CTX_init (&hctx);
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	118	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	119	}
62		120
63	crypto_ctx::~crypto_ctx ()	121	crypto_ctx::~crypto_ctx ()
64	{	122	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	123	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	124	HMAC_CTX_cleanup (&hctx);
67	}	125	}
68		126
69	static void	127	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	128	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
71	{	129	{
72	EVP_MD_CTX ctx;	130	EVP_MD_CTX ctx;
73		131
74	EVP_MD_CTX_init (&ctx);	132	EVP_MD_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	133	require (EVP_DigestInit (&ctx, RSA_HASH));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	134	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	135	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	136	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
79	EVP_MD_CTX_cleanup (&ctx);	137	EVP_MD_CTX_cleanup (&ctx);
80	}	138	}
81		139
82	struct rsa_entry {	140	struct rsa_entry
		141	{
83	tstamp expire;	142	tstamp expire;
84	rsaid id;	143	rsaid id;
85	rsachallenge chg;	144	rsachallenge chg;
86	};	145	};
87		146
88	struct rsa_cache : list<rsa_entry>	147	struct rsa_cache : list<rsa_entry>
89	{	148	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	149	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
91		150
92	bool find (const rsaid &id, rsachallenge &chg)	151	bool find (const rsaid &id, rsachallenge &chg)
93	{	152	{
94	for (iterator i = begin (); i != end (); ++i)	153	for (iterator i = begin (); i != end (); ++i)
95	{	154	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	155	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
97	{	156	{
98	memcpy (&chg, &i->chg, sizeof chg);	157	memcpy (&chg, &i->chg, sizeof chg);
99		158
100	erase (i);	159	erase (i);
101	return true;	160	return true;
102	}	161	}
103	}	162	}
104		163
105	if (cleaner.at < NOW)	164	if (!cleaner.is_active ())
106	cleaner.start (NOW + RSA_TTL);	165	cleaner.again ();
107		166
108	return false;	167	return false;
109	}	168	}
110		169
111	void gen (rsaid &id, rsachallenge &chg)	170	void gen (rsaid &id, rsachallenge &chg)
112	{	171	{
113	rsa_entry e;	172	rsa_entry e;
114		173
115	RAND_bytes ((unsigned char *)&id, sizeof id);	174	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);	175	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117		176
118	e.expire = NOW + RSA_TTL;	177	e.expire = ev_now () + RSA_TTL;
119	e.id = id;	178	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);	179	memcpy (&e.chg, &chg, sizeof chg);
121		180
122	push_back (e);	181	push_back (e);
123		182
124	if (cleaner.at < NOW)	183	if (!cleaner.is_active ())
125	cleaner.start (NOW + RSA_TTL);	184	cleaner.again ();
126	}	185	}
127		186
128	rsa_cache ()	187	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)	188	{
130	{ }	189	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
		190	cleaner.set (RSA_TTL, RSA_TTL);
		191	}
131		192
132	} rsa_cache;	193	} rsa_cache;
133		194
134	void rsa_cache::cleaner_cb (time_watcher &w)	195	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
135	{	196	{
136	if (empty ())	197	if (empty ())
137	w.at = TSTAMP_CANCEL;	198	w.stop ();
138	else	199	else
139	{	200	{
140	w.at = NOW + RSA_TTL;
141
142	for (iterator i = begin (); i != end (); )	201	for (iterator i = begin (); i != end (); )
143	if (i->expire <= NOW)	202	if (i->expire <= ev_now ())
144	i = erase (i);	203	i = erase (i);
145	else	204	else
146	++i;	205	++i;
147	}	206	}
148	}	207	}
149		208
150	//////////////////////////////////////////////////////////////////////////////	209	//////////////////////////////////////////////////////////////////////////////
151		210
152	void pkt_queue::put (tap_packet *p)	211	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		212	: max_ttl (max_ttl), max_queue (max_queue)
153	{	213	{
154	if (queue[i])	214	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		215
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	216	i = 0;
182	j = 0;	217	j = 0;
		218
		219	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	220	}
184		221
185	pkt_queue::~pkt_queue ()	222	pkt_queue::~pkt_queue ()
186	{	223	{
187	for (i = QUEUEDEPTH; --i > 0; )	224	while (net_packet *p = get ())
		225	delete p;
		226
188	delete queue[i];	227	delete [] queue;
189	}	228	}
190		229
		230	void pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void pkt_queue::put (net_packet *p)
		252	{
		253	ev_tstamp now = ev_now ();
		254
		255	// start expiry timer
		256	if (empty ())
		257	expire.start (max_ttl);
		258
		259	int ni = i + 1 == max_queue ? 0 : i + 1;
		260
		261	if (ni == j)
		262	delete get ();
		263
		264	queue[i].pkt = p;
		265	queue[i].tstamp = now;
		266
		267	i = ni;
		268	}
		269
		270	net_packet *pkt_queue::get ()
		271	{
		272	if (empty ())
		273	return 0;
		274
		275	net_packet *p = queue[j].pkt;
		276	queue[j].pkt = 0;
		277
		278	j = j + 1 == max_queue ? 0 : j + 1;
		279
		280	return p;
		281	}
		282
191	struct net_rateinfo {	283	struct net_rateinfo
		284	{
192	u32 host;	285	u32 host;
193	double pcnt, diff;	286	double pcnt, diff;
194	tstamp last;	287	tstamp last;
195	};	288	};
196		289
197	// only do action once every x seconds per host whole allowing bursts.	290	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	291	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	292	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	293	struct net_rate_limiter : list<net_rateinfo>
201	{	294	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	295	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	296	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	297	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		298	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		299
206	bool can (const sockinfo &si) { return can((u32)si.host); }	300	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	301	bool can (u32 host);
208	};	302	};
209		303
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	304	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		305
…		…
214	iterator i;	308	iterator i;
215		309
216	for (i = begin (); i != end (); )	310	for (i = begin (); i != end (); )
217	if (i->host == host)	311	if (i->host == host)
218	break;	312	break;
219	else if (i->last < NOW - EXPIRE)	313	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	314	i = erase (i);
221	else	315	else
222	i++;	316	i++;
223		317
224	if (i == end ())	318	if (i == end ())
225	{	319	{
226	net_rateinfo ri;	320	net_rateinfo ri;
227		321
228	ri.host = host;	322	ri.host = host;
229	ri.pcnt = 1.;	323	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	324	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	325	ri.last = ev_now ();
232		326
233	push_front (ri);	327	push_front (ri);
234		328
235	return true;	329	return true;
236	}	330	}
237	else	331	else
238	{	332	{
239	net_rateinfo ri (*i);	333	net_rateinfo ri (*i);
240	erase (i);	334	erase (i);
241		335
242	ri.pcnt = ri.pcnt * ALPHA;	336	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	337	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		338
245	ri.last = NOW;	339	ri.last = ev_now ();
246		340
		341	double dif = ri.diff / ri.pcnt;
		342
247	bool send = ri.diff / ri.pcnt > CUTOFF;	343	bool send = dif > NRL_CUTOFF;
248		344
		345	if (dif > NRL_MAXDIF)
		346	{
		347	ri.pcnt = 1.;
		348	ri.diff = NRL_MAXDIF;
		349	}
249	if (send)	350	else if (send)
250	ri.pcnt++;	351	ri.pcnt++;
251		352
252	push_front (ri);	353	push_front (ri);
253		354
254	return send;	355	return send;
…		…
299	}	400	}
300		401
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		404
304	struct vpndata_packet:vpn_packet	405	struct vpndata_packet : vpn_packet
305	{	406	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno	407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307		408
308	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	409	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
309	tap_packet unpack (connection conn, u32 &seqno);	410	tap_packet unpack (connection conn, u32 &seqno);
…		…
322	int outl = 0, outl2;	423	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
324		425
325	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
327	u32 cl;
328		428
		429	if (conn->features & ENABLE_COMPRESSION)
		430	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
330	if (cl)	433	if (cl)
331	{	434	{
332	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
333	d = cdata;	436	d = cdata;
334	l = cl + 2;	437	l = cl + 2;
335		438
336	d[0] = cl >> 8;	439	d[0] = cl >> 8;
337	d[1] = cl;	440	d[1] = cl;
		441	}
338	}	442	}
339	#endif	443	#endif
340		444
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
342		446
343	struct {	447	struct {
344	#if RAND_SIZE	448	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
346	#endif	450	#endif
…		…
350	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	455	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
353	#endif	457	#endif
354		458
355	EVP_EncryptUpdate (cctx,	459	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	460	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	461	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	462	outl += outl2;
359		463
360	EVP_EncryptUpdate (cctx,	464	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	465	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	466	(unsigned char *) d, l));
363	outl += outl2;	467	outl += outl2;
364		468
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	469	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	470	outl += outl2;
367		471
368	len = outl + data_hdr_size ();	472	len = outl + data_hdr_size ();
369		473
370	set_hdr (type, dst);	474	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	483	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	484	tap_packet *p = new tap_packet;
381	u8 *d;	485	u8 *d;
382	u32 l = len - data_hdr_size ();	486	u32 l = len - data_hdr_size ();
383		487
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	488	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
385		489
386	#if ENABLE_COMPRESSION	490	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	491	u8 cdata[MAX_MTU];
388		492
389	if (type == PT_DATA_COMPRESSED)	493	if (type == PT_DATA_COMPRESSED)
…		…
391	else	495	else
392	#endif	496	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	497	d = &(*p)[6 + 6 - DATAHDR];
394		498
395	/* this overwrites part of the src mac, but we fix that later */	499	/* this overwrites part of the src mac, but we fix that later */
396	EVP_DecryptUpdate (cctx,	500	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	501	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	502	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	503	outl += outl2;
400		504
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	505	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	506	outl += outl2;
403		507
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	508	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		509
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	510	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
435	{	539	{
436	// actually, hmaclen cannot be checked because the hmac	540	// actually, hmaclen cannot be checked because the hmac
437	// field comes before this data, so peers with other	541	// field comes before this data, so peers with other
438	// hmacs simply will not work.	542	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	543	u8 prot_major, prot_minor, randsize, hmaclen;
440	u8 flags, challengelen, pad2, pad3;	544	u8 flags, challengelen, features, pad3;
441	u32 cipher_nid, digest_nid, hmac_nid;	545	u32 cipher_nid, digest_nid, hmac_nid;
442
443	const u8 curflags () const
444	{
445	return 0x80
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}
448		546
449	void setup (ptype type, int dst);	547	void setup (ptype type, int dst);
450	bool chk_config () const;	548	bool chk_config () const;
		549
		550	static u8 get_features ()
		551	{
		552	u8 f = 0;
		553	#if ENABLE_COMPRESSION
		554	f \|= FEATURE_COMPRESSION;
		555	#endif
		556	#if ENABLE_ROHC
		557	f \|= FEATURE_ROHC;
		558	#endif
		559	#if ENABLE_BRIDGING
		560	f \|= FEATURE_BRIDGING;
		561	#endif
		562	return f;
		563	}
451	};	564	};
452		565
453	void config_packet::setup (ptype type, int dst)	566	void config_packet::setup (ptype type, int dst)
454	{	567	{
455	prot_major = PROTOCOL_MAJOR;	568	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	569	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	570	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	571	hmaclen = HMACLENGTH;
459	flags = curflags ();	572	flags = 0;
460	challengelen = sizeof (rsachallenge);	573	challengelen = sizeof (rsachallenge);
		574	features = get_features ();
461		575
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	576	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));	577	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	578	hmac_nid = htonl (EVP_MD_type (DIGEST));
465		579
…		…
467	set_hdr (type, dst);	581	set_hdr (type, dst);
468	}	582	}
469		583
470	bool config_packet::chk_config () const	584	bool config_packet::chk_config () const
471	{	585	{
472	return prot_major == PROTOCOL_MAJOR	586	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	587	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	588	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	589	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
		590	else if (hmaclen != HMACLENGTH)
		591	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
476	&& challengelen == sizeof (rsachallenge)	592	else if (challengelen != sizeof (rsachallenge))
		593	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	594	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		595	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	596	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		597	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	598	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		599	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		600	else
		601	return true;
		602
		603	return false;
480	}	604	}
481		605
482	struct auth_req_packet : config_packet	606	struct auth_req_packet : config_packet
483	{	607	{
484	char magic[8];	608	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	609	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	610	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	611	u8 pad2, pad3;
488	rsaid id;	612	rsaid id;
489	rsaencrdata encr;	613	rsaencrdata encr;
490		614
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	615	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
546	};	670	};
547		671
548	/////////////////////////////////////////////////////////////////////////////	672	/////////////////////////////////////////////////////////////////////////////
549		673
550	void	674	void
		675	connection::connection_established ()
		676	{
		677	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		678
		679	if (ictx && octx)
		680	{
		681	// make sure rekeying timeouts are slightly asymmetric
		682	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		683	rekey.start (rekey_interval, rekey_interval);
		684	keepalive.start (::conf.keepalive);
		685
		686	// send queued packets
		687	if (ictx && octx)
		688	{
		689	while (tap_packet p = (tap_packet )data_queue.get ())
		690	{
		691	if (p->len) send_data_packet (p);
		692	delete p;
		693	}
		694
		695	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		696	{
		697	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		698	delete p;
		699	}
		700	}
		701
		702	vpn->connection_established (this);
		703	}
		704	else
		705	{
		706	retry_cnt = 0;
		707	establish_connection.start (5);
		708	keepalive.stop ();
		709	rekey.stop ();
		710	}
		711	}
		712
		713	void
551	connection::reset_si ()	714	connection::reset_si ()
552	{	715	{
		716	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	717	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		718	else
555	// mask out protocols we cannot establish	719	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	720	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	721	protocol = 0;
		722	}
558		723
559	si.set (conf, protocol);	724	si.set (conf, protocol);
		725
		726	is_direct = si.valid ();
560	}	727	}
561		728
562	// ensure sockinfo is valid, forward if necessary	729	// ensure sockinfo is valid, forward if necessary
563	const sockinfo &	730	const sockinfo &
564	connection::forward_si (const sockinfo &si) const	731	connection::forward_si (const sockinfo &si) const
565	{	732	{
566	if (!si.valid ())	733	if (!si.valid ())
567	{	734	{
568	connection *r = vpn->find_router ();	735	connection *r = vpn->find_router_for (this);
569		736
570	if (r)	737	if (r)
571	{	738	{
572	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	739	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
573	conf->nodename, r->conf->nodename);	740	conf->nodename, r->conf->nodename);
574	return r->si;	741	return r->si;
575	}	742	}
576	else	743	else
577	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	744	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
578	conf->nodename);	745	conf->nodename);
579	}	746	}
580		747
581	return si;	748	return si;
582	}	749	}
583		750
584	void	751	void
		752	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		753	{
		754	if (!vpn->send_vpn_packet (pkt, si, tos))
		755	reset_connection ();
		756	}
		757
		758	void
585	connection::send_ping (const sockinfo &si, u8 pong)	759	connection::send_ping (const sockinfo &si, u8 pong)
586	{	760	{
587	ping_packet *pkt = new ping_packet;	761	ping_packet *pkt = new ping_packet;
588		762
589	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	763	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		764
		765	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		766
590	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	767	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
591		768
592	delete pkt;	769	delete pkt;
593	}	770	}
594		771
595	void	772	void
…		…
598	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	775	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
599	{	776	{
600	config_packet *pkt = new config_packet;	777	config_packet *pkt = new config_packet;
601		778
602	pkt->setup (vpn_packet::PT_RESET, conf->id);	779	pkt->setup (vpn_packet::PT_RESET, conf->id);
603	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);	780	send_vpn_packet (pkt, si, IPTOS_MINCOST);
604		781
605	delete pkt;	782	delete pkt;
606	}	783	}
607	}	784	}
608		785
…		…
610	connection::send_auth_request (const sockinfo &si, bool initiate)	787	connection::send_auth_request (const sockinfo &si, bool initiate)
611	{	788	{
612	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	789	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
613		790
614	rsachallenge chg;	791	rsachallenge chg;
615
616	rsa_cache.gen (pkt->id, chg);	792	rsa_cache.gen (pkt->id, chg);
		793	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
617		794
618	if (0 > RSA_public_encrypt (sizeof chg,
619	(unsigned char )&chg, (unsigned char )&pkt->encr,
620	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
621	fatal ("RSA_public_encrypt error");
622
623	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	795	slog (L_TRACE, "%s >> PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
624		796
625	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	797	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
626
627		798
628	delete pkt;	799	delete pkt;
629	}	800	}
630		801
631	void	802	void
…		…
637		808
638	rsa_hash (id, chg, pkt->response);	809	rsa_hash (id, chg, pkt->response);
639		810
640	pkt->hmac_set (octx);	811	pkt->hmac_set (octx);
641		812
642	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	813	slog (L_TRACE, "%s >> PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
643		814
644	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	815	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
645		816
646	delete pkt;	817	delete pkt;
647	}	818	}
648		819
649	void	820	void
650	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	821	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
651	{	822	{
652	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	823	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s)", conf->nodename,
653	conf->id, rid, (const char *)rsi);	824	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
654		825
655	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	826	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
656		827
657	r->hmac_set (octx);	828	r->hmac_set (octx);
658	vpn->send_vpn_packet (r, si);	829	send_vpn_packet (r, si);
659		830
660	delete r;	831	delete r;
661	}	832	}
662		833
663	void	834	inline void
664	connection::establish_connection_cb (time_watcher &w)	835	connection::establish_connection_cb (ev::timer &w, int revents)
665	{	836	{
666	if (ictx \|\| conf == THISNODE	837	if (!ictx
		838	&& conf != THISNODE
667	\|\| connectmode == conf_node::C_NEVER	839	&& connectmode != conf_node::C_NEVER
668	\|\| connectmode == conf_node::C_DISABLED)	840	&& connectmode != conf_node::C_DISABLED
669	w.at = TSTAMP_CANCEL;	841	&& !w.is_active ())
670	else if (w.at <= NOW)
671	{	842	{
672	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	843	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
673		844	// and stop trying. should probably be handled by a per-connection expire handler.
674	if (retry_int < 3600 * 8)	845	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		846	{
		847	reset_connection ();
675	retry_cnt++;	848	return;
		849	}
676		850
677	w.at = NOW + retry_int;	851	last_establish_attempt = ev_now ();
		852
		853	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		854	? (retry_cnt & 3) + 1
		855	: 1 << (retry_cnt >> 2));
678		856
679	reset_si ();	857	reset_si ();
680		858
681	if (si.prot && !si.host)	859	bool slow = si.prot & PROT_SLOW;
		860
		861	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		862	{
		863	/TODO/ /* start the timer so we don't recurse endlessly */
		864	w.start (1);
682	vpn->connect_request (conf->id);	865	vpn->send_connect_request (this);
		866	}
683	else	867	else
684	{	868	{
		869	if (si.valid ())
		870	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		871	conf->nodename, (const char *)si);
		872
685	const sockinfo &dsi = forward_si (si);	873	const sockinfo &dsi = forward_si (si);
		874
		875	slow = slow \|\| (dsi.prot & PROT_SLOW);
686		876
687	if (dsi.valid () && auth_rate_limiter.can (dsi))	877	if (dsi.valid () && auth_rate_limiter.can (dsi))
688	{	878	{
689	if (retry_cnt < 4)	879	if (retry_cnt < 4)
690	send_auth_request (dsi, true);	880	send_auth_request (dsi, true);
691	else	881	else
692	send_ping (dsi, 0);	882	send_ping (dsi, 0);
693	}	883	}
694	}	884	}
		885
		886	retry_int *= slow ? 8. : 0.9;
		887
		888	if (retry_int < conf->max_retry)
		889	retry_cnt++;
		890	else
		891	retry_int = conf->max_retry;
		892
		893	w.start (retry_int);
695	}	894	}
696	}	895	}
697		896
698	void	897	void
699	connection::reset_connection ()	898	connection::reset_connection ()
…		…
702	{	901	{
703	slog (L_INFO, _("%s(%s): connection lost"),	902	slog (L_INFO, _("%s(%s): connection lost"),
704	conf->nodename, (const char *)si);	903	conf->nodename, (const char *)si);
705		904
706	if (::conf.script_node_down)	905	if (::conf.script_node_down)
707	run_script (run_script_cb (this, &connection::script_node_down), false);	906	{
		907	run_script_cb *cb = new run_script_cb;
		908	cb->set<connection, &connection::script_node_down> (this);
		909	run_script_queued (cb, _("node-down command execution failed, continuing."));
		910	}
708	}	911	}
709		912
710	delete ictx; ictx = 0;	913	delete ictx; ictx = 0;
711	delete octx; octx = 0;	914	delete octx; octx = 0;
		915	#if ENABLE_DNS
		916	dnsv4_reset_connection ();
		917	#endif
712		918
713	si.host= 0;	919	si.host = 0;
714		920
715	last_activity = 0;	921	last_activity = 0.;
		922	//last_si_change = 0.;
716	retry_cnt = 0;	923	retry_cnt = 0;
717		924
718	rekey.reset ();	925	rekey.stop ();
719	keepalive.reset ();	926	keepalive.stop ();
720	establish_connection.reset ();	927	establish_connection.stop ();
721	}	928	}
722		929
723	void	930	void
724	connection::shutdown ()	931	connection::shutdown ()
725	{	932	{
…		…
727	send_reset (si);	934	send_reset (si);
728		935
729	reset_connection ();	936	reset_connection ();
730	}	937	}
731		938
732	void	939	// poor-man's rekeying
733	connection::rekey_cb (time_watcher &w)	940	inline void
		941	connection::rekey_cb (ev::timer &w, int revents)
734	{	942	{
735	w.at = TSTAMP_CANCEL;
736
737	reset_connection ();	943	reset_connection ();
738	establish_connection ();	944	establish_connection ();
739	}	945	}
740		946
741	void	947	void
742	connection::send_data_packet (tap_packet *pkt, bool broadcast)	948	connection::send_data_packet (tap_packet *pkt)
743	{	949	{
744	vpndata_packet *p = new vpndata_packet;	950	vpndata_packet *p = new vpndata_packet;
745	int tos = 0;	951	int tos = 0;
746		952
747	if (conf->inherit_tos	953	// I am not hilarious about peeking into packets, but so be it.
748	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	954	if (conf->inherit_tos && pkt->is_ipv4 ())
749	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
750	tos = (*pkt)[15] & IPTOS_TOS_MASK;	955	tos = (*pkt)[15] & IPTOS_TOS_MASK;
751		956
752	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	957	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
753	vpn->send_vpn_packet (p, si, tos);	958	send_vpn_packet (p, si, tos);
754		959
755	delete p;	960	delete p;
756		961
757	if (oseqno > MAX_SEQNO)	962	if (oseqno > MAX_SEQNO)
758	rekey ();	963	rekey ();
759	}	964	}
760		965
761	void	966	void
		967	connection::post_inject_queue ()
		968	{
		969	// force a connection every now and when when packets are sent (max 1/s)
		970	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		971	establish_connection.stop ();
		972
		973	establish_connection ();
		974	}
		975
		976	void
762	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	977	connection::inject_data_packet (tap_packet *pkt)
763	{	978	{
764	if (ictx && octx)	979	if (ictx && octx)
765	send_data_packet (pkt, broadcast);	980	send_data_packet (pkt);
766	else	981	else
767	{	982	{
768	if (!broadcast)//DDDD
769	queue.put (new tap_packet (*pkt));	983	data_queue.put (new tap_packet (*pkt));
770		984	post_inject_queue ();
771	establish_connection ();
772	}	985	}
773	}	986	}
774		987
775	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	988	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
776	{	989	{
777	if (ictx && octx)	990	if (ictx && octx)
778	vpn->send_vpn_packet (pkt, si, tos);	991	send_vpn_packet (pkt, si, tos);
779	else	992	else
780	establish_connection ();	993	{
		994	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		995	post_inject_queue ();
		996	}
781	}	997	}
782		998
783	void	999	void
784	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1000	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
785	{	1001	{
786	last_activity = NOW;	1002	last_activity = ev_now ();
787		1003
788	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1004	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
789	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1005	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1006
		1007	if (connectmode == conf_node::C_DISABLED)
		1008	return;
790		1009
791	switch (pkt->typ ())	1010	switch (pkt->typ ())
792	{	1011	{
793	case vpn_packet::PT_PING:	1012	case vpn_packet::PT_PING:
		1013	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1014
794	// we send pings instead of auth packets after some retries,	1015	// we send pings instead of auth packets after some retries,
795	// so reset the retry counter and establish a connection	1016	// so reset the retry counter and establish a connection
796	// when we receive a ping.	1017	// when we receive a ping.
797	if (!ictx)	1018	if (!ictx)
798	{	1019	{
799	if (auth_rate_limiter.can (rsi))	1020	if (auth_rate_limiter.can (rsi))
800	send_auth_request (rsi, true);	1021	send_auth_request (rsi, true);
801	}	1022	}
802	else	1023	else
		1024	// we would love to change thre socket address here, but ping's aren't
		1025	// authenticated, so we best ignore it.
803	send_ping (rsi, 1); // pong	1026	send_ping (rsi, 1); // pong
804		1027
805	break;	1028	break;
806		1029
807	case vpn_packet::PT_PONG:	1030	case vpn_packet::PT_PONG:
		1031	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
808	break;	1032	break;
809		1033
810	case vpn_packet::PT_RESET:	1034	case vpn_packet::PT_RESET:
811	{	1035	{
812	reset_connection ();	1036	reset_connection ();
813		1037
814	config_packet p = (config_packet ) pkt;	1038	config_packet p = (config_packet ) pkt;
815		1039
816	if (!p->chk_config ())	1040	if (!p->chk_config ())
817	{	1041	{
818	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1042	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
819	conf->nodename, (const char *)rsi);	1043	conf->nodename, (const char *)rsi);
820	connectmode = conf_node::C_DISABLED;	1044	connectmode = conf_node::C_DISABLED;
821	}	1045	}
822	else if (connectmode == conf_node::C_ALWAYS)	1046	else if (connectmode == conf_node::C_ALWAYS)
823	establish_connection ();	1047	establish_connection ();
…		…
827	case vpn_packet::PT_AUTH_REQ:	1051	case vpn_packet::PT_AUTH_REQ:
828	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
829	{	1053	{
830	auth_req_packet p = (auth_req_packet ) pkt;	1054	auth_req_packet p = (auth_req_packet ) pkt;
831		1055
832	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1056	slog (L_TRACE, "%s << PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
833		1057
834	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1058	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
835	{	1059	{
836	if (p->prot_minor != PROTOCOL_MINOR)	1060	if (p->prot_minor != PROTOCOL_MINOR)
837	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1061	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
841	if (p->initiate)	1065	if (p->initiate)
842	send_auth_request (rsi, false);	1066	send_auth_request (rsi, false);
843		1067
844	rsachallenge k;	1068	rsachallenge k;
845		1069
846	if (0 > RSA_private_decrypt (sizeof (p->encr),	1070	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
847	(unsigned char )&p->encr, (unsigned char )&k,	1071	{
848	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
849	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1072	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
850	conf->nodename, (const char *)rsi);	1073	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1074	break;
		1075	}
851	else	1076	else
852	{	1077	{
853	retry_cnt = 0;
854	establish_connection.start (NOW + 8); //? ;)
855	keepalive.reset ();
856	rekey.reset ();
857
858	delete ictx;
859	ictx = 0;
860
861	delete octx;	1078	delete octx;
862		1079
863	octx = new crypto_ctx (k, 1);	1080	octx = new crypto_ctx (k, 1);
864	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1081	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
865		1082
866	conf->protocols = p->protocols;	1083	conf->protocols = p->protocols;
		1084	features = p->features & config_packet::get_features ();
		1085
867	send_auth_response (rsi, p->id, k);	1086	send_auth_response (rsi, p->id, k);
		1087
		1088	connection_established ();
868		1089
869	break;	1090	break;
870	}	1091	}
871	}	1092	}
		1093	else
		1094	slog (L_WARN, _("%s(%s): protocol mismatch."),
		1095	conf->nodename, (const char *)rsi);
872		1096
873	send_reset (rsi);	1097	send_reset (rsi);
874	}	1098	}
875		1099
876	break;	1100	break;
877		1101
878	case vpn_packet::PT_AUTH_RES:	1102	case vpn_packet::PT_AUTH_RES:
879	{	1103	{
880	auth_res_packet p = (auth_res_packet ) pkt;	1104	auth_res_packet p = (auth_res_packet )pkt;
881		1105
882	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1106	slog (L_TRACE, "%s << PT_AUTH_RES", conf->nodename);
883		1107
884	if (p->chk_config ())	1108	if (p->chk_config ())
885	{	1109	{
886	if (p->prot_minor != PROTOCOL_MINOR)	1110	if (p->prot_minor != PROTOCOL_MINOR)
887	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1111	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
889	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1113	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
890		1114
891	rsachallenge chg;	1115	rsachallenge chg;
892		1116
893	if (!rsa_cache.find (p->id, chg))	1117	if (!rsa_cache.find (p->id, chg))
		1118	{
894	slog (L_ERR, _("%s(%s): unrequested auth response"),	1119	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
895	conf->nodename, (const char *)rsi);	1120	conf->nodename, (const char *)rsi);
		1121	break;
		1122	}
896	else	1123	else
897	{	1124	{
898	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1125	crypto_ctx *cctx = new crypto_ctx (chg, 0);
899		1126
900	if (!p->hmac_chk (cctx))	1127	if (!p->hmac_chk (cctx))
		1128	{
901	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1129	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
902	"could be an attack, or just corruption or an synchronization error"),	1130	"could be an attack, or just corruption or a synchronization error."),
903	conf->nodename, (const char *)rsi);	1131	conf->nodename, (const char *)rsi);
		1132	break;
		1133	}
904	else	1134	else
905	{	1135	{
906	rsaresponse h;	1136	rsaresponse h;
907		1137
908	rsa_hash (p->id, chg, h);	1138	rsa_hash (p->id, chg, h);
…		…
916	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1146	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
917		1147
918	si = rsi;	1148	si = rsi;
919	protocol = rsi.prot;	1149	protocol = rsi.prot;
920		1150
921	rekey.start (NOW + ::conf.rekey);	1151	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
922	keepalive.start (NOW + ::conf.keepalive);	1152	conf->nodename, (const char *)rsi,
		1153	is_direct ? "direct" : "routed",
		1154	p->prot_major, p->prot_minor);
923		1155
924	// send queued packets	1156	connection_established ();
925	while (tap_packet *p = queue.get ())	1157
		1158	if (::conf.script_node_up)
926	{	1159	{
927	send_data_packet (p);	1160	run_script_cb *cb = new run_script_cb;
928	delete p;	1161	cb->set<connection, &connection::script_node_up> (this);
		1162	run_script_queued (cb, _("node-up command execution failed, continuing."));
929	}	1163	}
930
931	connectmode = conf->connectmode;
932
933	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
934	conf->nodename, (const char *)rsi,
935	p->prot_major, p->prot_minor);
936
937	if (::conf.script_node_up)
938	run_script (run_script_cb (this, &connection::script_node_up), false);
939		1164
940	break;	1165	break;
941	}	1166	}
942	else	1167	else
943	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1168	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
944	conf->nodename, (const char *)rsi);	1169	conf->nodename, (const char *)rsi);
945	}	1170	}
946		1171
947	delete cctx;	1172	delete cctx;
948	}	1173	}
…		…
962		1187
963	if (ictx && octx)	1188	if (ictx && octx)
964	{	1189	{
965	vpndata_packet p = (vpndata_packet )pkt;	1190	vpndata_packet p = (vpndata_packet )pkt;
966		1191
967	if (rsi == si)	1192	if (!p->hmac_chk (ictx))
		1193	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1194	"could be an attack, or just corruption or a synchronization error."),
		1195	conf->nodename, (const char *)rsi);
		1196	else
968	{	1197	{
969	if (!p->hmac_chk (ictx))
970	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
971	"could be an attack, or just corruption or an synchronization error"),
972	conf->nodename, (const char *)rsi);
973	else	1198	u32 seqno;
		1199	tap_packet *d = p->unpack (this, seqno);
		1200	int seqclass = iseqno.seqno_classify (seqno);
		1201
		1202	if (seqclass == 0) // ok
974	{	1203	{
975	u32 seqno;	1204	vpn->tap->send (d);
976	tap_packet *d = p->unpack (this, seqno);
977		1205
978	if (iseqno.recv_ok (seqno))	1206	if (si != rsi)
979	{	1207	{
980	vpn->tap->send (d);	1208	// fast re-sync on source address changes, useful especially for tcp/ip
981		1209	//if (last_si_change < ev_now () + 5.)
982	if (p->dst () == 0) // re-broadcast
983	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
984	{	1210	// {
		1211	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1212	conf->nodename, (const char )si, (const char )rsi);
		1213
985	connection c = i;	1214	si = rsi;
986
987	if (c->conf != THISNODE && c->conf != conf)
988	c->inject_data_packet (d);
989	}	1215	// }
990
991	delete d;	1216	//else
992		1217	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
993	break;	1218	// conf->nodename, (const char )si, (const char )rsi);
994	}	1219	}
995	}	1220	}
		1221	else if (seqclass == 1) // far history
		1222	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1223	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1224	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1225	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1226	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1227	else if (seqclass == 3) // reset
		1228	{
		1229	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1230	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1231	send_reset (rsi);
		1232	}
		1233
		1234	delete d;
		1235	break;
996	}	1236	}
997	else
998	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
999	}	1237	}
1000		1238
1001	send_reset (rsi);	1239	send_reset (rsi);
1002	break;	1240	break;
1003		1241
1004	case vpn_packet::PT_CONNECT_REQ:	1242	case vpn_packet::PT_CONNECT_REQ:
1005	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1243	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1006	{	1244	{
1007	connect_req_packet p = (connect_req_packet ) pkt;	1245	connect_req_packet p = (connect_req_packet ) pkt;
1008		1246
1009	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1247	if (p->id > 0 && p->id <= vpn->conns.size ())
1010	connection *c = vpn->conns[p->id - 1];
1011	conf->protocols = p->protocols;
1012
1013	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1014	conf->id, p->id, c->ictx && c->octx);
1015
1016	if (c->ictx && c->octx)
1017	{	1248	{
		1249	connection *c = vpn->conns[p->id - 1];
		1250	conf->protocols = p->protocols;
		1251
		1252	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s) [%d]",
		1253	conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
		1254
		1255	if (c->ictx && c->octx)
		1256	{
1018	// send connect_info packets to both sides, in case one is	1257	// send connect_info packets to both sides, in case one is
1019	// behind a nat firewall (or both ;)	1258	// behind a nat firewall (or both ;)
1020	c->send_connect_info (conf->id, si, conf->protocols);	1259	c->send_connect_info (conf->id, si, conf->protocols);
1021	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1260	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1261	}
		1262	else
		1263	c->establish_connection ();
1022	}	1264	}
		1265	else
		1266	slog (L_WARN,
		1267	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1268	p->id);
1023	}	1269	}
1024		1270
1025	break;	1271	break;
1026		1272
1027	case vpn_packet::PT_CONNECT_INFO:	1273	case vpn_packet::PT_CONNECT_INFO:
1028	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1274	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1029	{	1275	{
1030	connect_info_packet p = (connect_info_packet ) pkt;	1276	connect_info_packet p = (connect_info_packet )pkt;
1031		1277
1032	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1278	if (p->id > 0 && p->id <= vpn->conns.size ())
1033		1279	{
1034	connection *c = vpn->conns[p->id - 1];	1280	connection *c = vpn->conns[p->id - 1];
1035		1281
1036	c->conf->protocols = p->protocols;	1282	c->conf->protocols = p->protocols;
1037	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1283	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1038	p->si.upgrade_protocol (protocol, c->conf);	1284	p->si.upgrade_protocol (protocol, c->conf);
1039		1285
1040	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1286	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s) [%d]",
		1287	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1041	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1288	(const char *)p->si, !c->ictx && !c->octx);
1042		1289
1043	const sockinfo &dsi = forward_si (p->si);	1290	const sockinfo &dsi = forward_si (p->si);
1044		1291
1045	if (dsi.valid ())	1292	if (dsi.valid ())
1046	c->send_auth_request (dsi, true);	1293	c->send_auth_request (dsi, true);
		1294	}
		1295	else
		1296	slog (L_WARN,
		1297	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1298	p->id);
1047	}	1299	}
1048		1300
1049	break;	1301	break;
1050		1302
1051	default:	1303	default:
1052	send_reset (rsi);	1304	send_reset (rsi);
1053	break;	1305	break;
1054	}	1306	}
1055	}	1307	}
1056		1308
1057	void connection::keepalive_cb (time_watcher &w)	1309	inline void
		1310	connection::keepalive_cb (ev::timer &w, int revents)
1058	{	1311	{
1059	if (NOW >= last_activity + ::conf.keepalive + 30)	1312	if (ev_now () >= last_activity + ::conf.keepalive + 30)
1060	{	1313	{
1061	reset_connection ();	1314	reset_connection ();
1062	establish_connection ();	1315	establish_connection ();
1063	}	1316	}
1064	else if (NOW < last_activity + ::conf.keepalive)	1317	else if (ev_now () < last_activity + ::conf.keepalive)
1065	w.at = last_activity + ::conf.keepalive;	1318	w.start (last_activity + ::conf.keepalive - ev::now ());
1066	else if (conf->connectmode != conf_node::C_ONDEMAND	1319	else if (conf->connectmode != conf_node::C_ONDEMAND
1067	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1320	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1068	{	1321	{
1069	send_ping (si);	1322	send_ping (si);
1070	w.at = NOW + 5;	1323	w.start (5);
1071	}	1324	}
		1325	else if (ev_now () < last_activity + ::conf.keepalive + 10)
		1326	// hold ondemand connections implicitly a few seconds longer
		1327	// should delete octx, though, or something like that ;)
		1328	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1072	else	1329	else
1073	reset_connection ();	1330	reset_connection ();
1074	}	1331	}
1075		1332
1076	void connection::connect_request (int id)	1333	void connection::send_connect_request (int id)
1077	{	1334	{
1078	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1335	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1079		1336
1080	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1337	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s)",
		1338	conf->nodename, vpn->conns[id - 1]->conf->nodename);
1081	p->hmac_set (octx);	1339	p->hmac_set (octx);
1082	vpn->send_vpn_packet (p, si);	1340	send_vpn_packet (p, si);
1083		1341
1084	delete p;	1342	delete p;
1085	}	1343	}
1086		1344
		1345	void connection::script_init_env (const char *ext)
		1346	{
		1347	char *env;
		1348	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1349	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1350	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1351	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1352	conf->id & 0xff); putenv (env);
		1353	}
		1354
1087	void connection::script_node ()	1355	void connection::script_init_connect_env ()
1088	{	1356	{
1089	vpn->script_if_up ();	1357	vpn->script_init_env ();
1090		1358
1091	char *env;	1359	char *env;
1092	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1360	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1093	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1361	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1094	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1362	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1095	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1363	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1096	}	1364	}
1097		1365
		1366	inline const char *
1098	const char *connection::script_node_up ()	1367	connection::script_node_up ()
1099	{	1368	{
1100	script_node ();	1369	script_init_connect_env ();
1101		1370
1102	putenv ("STATE=up");	1371	putenv ((char *)"STATE=up");
1103		1372
		1373	char *filename;
		1374	asprintf (&filename,
		1375	"%s/%s",
		1376	confbase,
1104	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1377	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1105	}
1106		1378
		1379	return filename;
		1380	}
		1381
		1382	inline const char *
1107	const char *connection::script_node_down ()	1383	connection::script_node_down ()
1108	{	1384	{
1109	script_node ();	1385	script_init_connect_env ();
1110		1386
1111	putenv ("STATE=down");	1387	putenv ((char *)"STATE=down");
1112		1388
1113	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1389	char *filename;
1114	}	1390	asprintf (&filename,
		1391	"%s/%s",
		1392	confbase,
		1393	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1115		1394
		1395	return filename;
		1396	}
		1397
1116	connection::connection(struct vpn *vpn_)	1398	connection::connection (struct vpn vpn, conf_node conf)
1117	: vpn(vpn_)	1399	: vpn(vpn), conf(conf),
1118	, rekey (this, &connection::rekey_cb)	1400	#if ENABLE_DNS
1119	, keepalive (this, &connection::keepalive_cb)	1401	dns (0),
		1402	#endif
		1403	data_queue(conf->max_ttl, conf->max_queue + 1),
		1404	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1405	{
		1406	rekey .set<connection, &connection::rekey_cb > (this);
		1407	keepalive .set<connection, &connection::keepalive_cb > (this);
1120	, establish_connection (this, &connection::establish_connection_cb)	1408	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1121	{	1409
		1410	last_establish_attempt = 0.;
1122	octx = ictx = 0;	1411	octx = ictx = 0;
1123	retry_cnt = 0;
1124		1412
1125	connectmode = conf_node::C_ALWAYS; // initial setting	1413	if (!conf->protocols) // make sure some protocol is enabled
		1414	conf->protocols = PROT_UDPv4;
		1415
		1416	connectmode = conf->connectmode;
		1417
		1418	// queue a dummy packet to force an initial connection attempt
		1419	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1420	vpn_queue.put (new net_packet);
		1421
1126	reset_connection ();	1422	reset_connection ();
1127	}	1423	}
1128		1424
1129	connection::~connection ()	1425	connection::~connection ()
1130	{	1426	{

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Comparing gvpe/src/connection.C (file contents): Revision 1.8 by pcg, Sun Apr 6 04:17:36 2003 UTC vs. Revision 1.79 by pcg, Fri Aug 15 17:45:12 2008 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.8 by pcg, Sun Apr 6 04:17:36 2003 UTC vs.
Revision 1.79 by pcg, Fri Aug 15 17:45:12 2008 UTC