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

Comparing gvpe/src/connection.C (file contents):
Revision 1.9 by pcg, Sun Apr 6 04:31:51 2003 UTC vs.
Revision 1.87 by pcg, Fri Nov 12 18:39:33 2010 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_OLD "vped\xbd\xc6\xdb\x82" // 8 bytes of magic (still used in the protocol)
		56	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic (understood but not generated)
		57
		58	#define ULTRA_FAST 1
		59	#define HLOG 15
		60	#include "lzf/lzf.h"
		61	#include "lzf/lzf_c.c"
		62	#include "lzf/lzf_d.c"
		63
		64	//////////////////////////////////////////////////////////////////////////////
		65
		66	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		67	static ev::child rs_child_ev;
		68
		69	void // c++ requires external linkage here, apparently :(
		70	rs_child_cb (ev::child &w, int revents)
		71	{
		72	w.stop ();
		73
		74	if (rs_queue.empty ())
		75	return;
		76
		77	pid_t pid = run_script (*rs_queue.front ().first, false);
		78	if (pid)
		79	{
		80	w.set (pid);
		81	w.start ();
		82	}
		83	else
		84	slog (L_WARN, rs_queue.front ().second);
		85
		86	delete rs_queue.front ().first;
		87	rs_queue.pop ();
		88	}
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb cb, const char warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
56	{	115	{
57	EVP_CIPHER_CTX_init (&cctx);	116	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	117	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
59	HMAC_CTX_init (&hctx);	118	HMAC_CTX_init (&hctx);
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	119	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	120	}
62		121
63	crypto_ctx::~crypto_ctx ()	122	crypto_ctx::~crypto_ctx ()
64	{	123	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	124	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	125	HMAC_CTX_cleanup (&hctx);
67	}	126	}
68		127
69	static void	128	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	129	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
71	{	130	{
72	EVP_MD_CTX ctx;	131	EVP_MD_CTX ctx;
73		132
74	EVP_MD_CTX_init (&ctx);	133	EVP_MD_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	134	require (EVP_DigestInit (&ctx, RSA_HASH));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	135	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	136	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	137	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
79	EVP_MD_CTX_cleanup (&ctx);	138	EVP_MD_CTX_cleanup (&ctx);
80	}	139	}
81		140
82	struct rsa_entry {	141	struct rsa_entry
		142	{
83	tstamp expire;	143	tstamp expire;
84	rsaid id;	144	rsaid id;
85	rsachallenge chg;	145	rsachallenge chg;
86	};	146	};
87		147
88	struct rsa_cache : list<rsa_entry>	148	struct rsa_cache : list<rsa_entry>
89	{	149	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	150	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
91		151
92	bool find (const rsaid &id, rsachallenge &chg)	152	bool find (const rsaid &id, rsachallenge &chg)
93	{	153	{
94	for (iterator i = begin (); i != end (); ++i)	154	for (iterator i = begin (); i != end (); ++i)
95	{	155	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	156	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
97	{	157	{
98	memcpy (&chg, &i->chg, sizeof chg);	158	memcpy (&chg, &i->chg, sizeof chg);
99		159
100	erase (i);	160	erase (i);
101	return true;	161	return true;
102	}	162	}
103	}	163	}
104		164
105	if (cleaner.at < NOW)	165	if (!cleaner.is_active ())
106	cleaner.start (NOW + RSA_TTL);	166	cleaner.again ();
107		167
108	return false;	168	return false;
109	}	169	}
110		170
111	void gen (rsaid &id, rsachallenge &chg)	171	void gen (rsaid &id, rsachallenge &chg)
112	{	172	{
113	rsa_entry e;	173	rsa_entry e;
114		174
115	RAND_bytes ((unsigned char *)&id, sizeof id);	175	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);	176	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117		177
118	e.expire = NOW + RSA_TTL;	178	e.expire = ev_now () + RSA_TTL;
119	e.id = id;	179	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);	180	memcpy (&e.chg, &chg, sizeof chg);
121		181
122	push_back (e);	182	push_back (e);
123		183
124	if (cleaner.at < NOW)	184	if (!cleaner.is_active ())
125	cleaner.start (NOW + RSA_TTL);	185	cleaner.again ();
126	}	186	}
127		187
128	rsa_cache ()	188	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)	189	{
130	{ }	190	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
		191	cleaner.set (RSA_TTL, RSA_TTL);
		192	}
131		193
132	} rsa_cache;	194	} rsa_cache;
133		195
134	void rsa_cache::cleaner_cb (time_watcher &w)	196	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
135	{	197	{
136	if (empty ())	198	if (empty ())
137	w.at = TSTAMP_CANCEL;	199	w.stop ();
138	else	200	else
139	{	201	{
140	w.at = NOW + RSA_TTL;
141
142	for (iterator i = begin (); i != end (); )	202	for (iterator i = begin (); i != end (); )
143	if (i->expire <= NOW)	203	if (i->expire <= ev_now ())
144	i = erase (i);	204	i = erase (i);
145	else	205	else
146	++i;	206	++i;
147	}	207	}
148	}	208	}
149		209
150	//////////////////////////////////////////////////////////////////////////////	210	//////////////////////////////////////////////////////////////////////////////
151		211
152	void pkt_queue::put (tap_packet *p)	212	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		213	: max_ttl (max_ttl), max_queue (max_queue)
153	{	214	{
154	if (queue[i])	215	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		216
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;	217	i = 0;
182	j = 0;	218	j = 0;
		219
		220	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	221	}
184		222
185	pkt_queue::~pkt_queue ()	223	pkt_queue::~pkt_queue ()
186	{	224	{
187	for (i = QUEUEDEPTH; --i > 0; )	225	while (net_packet *p = get ())
		226	delete p;
		227
188	delete queue[i];	228	delete [] queue;
189	}	229	}
190		230
		231	void pkt_queue::expire_cb (ev::timer &w, int revents)
		232	{
		233	ev_tstamp expire = ev_now () - max_ttl;
		234
		235	for (;;)
		236	{
		237	if (empty ())
		238	break;
		239
		240	double diff = queue[j].tstamp - expire;
		241
		242	if (diff >= 0.)
		243	{
		244	w.start (diff > 0.5 ? diff : 0.5);
		245	break;
		246	}
		247
		248	delete get ();
		249	}
		250	}
		251
		252	void pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *pkt_queue::get ()
		272	{
		273	if (empty ())
		274	return 0;
		275
		276	net_packet *p = queue[j].pkt;
		277	queue[j].pkt = 0;
		278
		279	j = j + 1 == max_queue ? 0 : j + 1;
		280
		281	return p;
		282	}
		283
191	struct net_rateinfo {	284	struct net_rateinfo
		285	{
192	u32 host;	286	u32 host;
193	double pcnt, diff;	287	double pcnt, diff;
194	tstamp last;	288	tstamp last;
195	};	289	};
196		290
197	// only do action once every x seconds per host whole allowing bursts.	291	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	292	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	293	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	294	struct net_rate_limiter : list<net_rateinfo>
201	{	295	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	296	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	297	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	298	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		299	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		300
206	bool can (const sockinfo &si) { return can((u32)si.host); }	301	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	302	bool can (u32 host);
208	};	303	};
209		304
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	305	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		306
…		…
214	iterator i;	309	iterator i;
215		310
216	for (i = begin (); i != end (); )	311	for (i = begin (); i != end (); )
217	if (i->host == host)	312	if (i->host == host)
218	break;	313	break;
219	else if (i->last < NOW - EXPIRE)	314	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	315	i = erase (i);
221	else	316	else
222	i++;	317	i++;
223		318
224	if (i == end ())	319	if (i == end ())
225	{	320	{
226	net_rateinfo ri;	321	net_rateinfo ri;
227		322
228	ri.host = host;	323	ri.host = host;
229	ri.pcnt = 1.;	324	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	325	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	326	ri.last = ev_now ();
232		327
233	push_front (ri);	328	push_front (ri);
234		329
235	return true;	330	return true;
236	}	331	}
237	else	332	else
238	{	333	{
239	net_rateinfo ri (*i);	334	net_rateinfo ri (*i);
240	erase (i);	335	erase (i);
241		336
242	ri.pcnt = ri.pcnt * ALPHA;	337	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	338	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		339
245	ri.last = NOW;	340	ri.last = ev_now ();
246		341
		342	double dif = ri.diff / ri.pcnt;
		343
247	bool send = ri.diff / ri.pcnt > CUTOFF;	344	bool send = dif > NRL_CUTOFF;
248		345
		346	if (dif > NRL_MAXDIF)
		347	{
		348	ri.pcnt = 1.;
		349	ri.diff = NRL_MAXDIF;
		350	}
249	if (send)	351	else if (send)
250	ri.pcnt++;	352	ri.pcnt++;
251		353
252	push_front (ri);	354	push_front (ri);
253		355
254	return send;	356	return send;
…		…
299	}	401	}
300		402
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	403	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	404	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		405
304	struct vpndata_packet:vpn_packet	406	struct vpndata_packet : vpn_packet
305	{	407	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno	408	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307		409
308	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	410	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
309	tap_packet unpack (connection conn, u32 &seqno);	411	tap_packet unpack (connection conn, u32 &seqno);
…		…
322	int outl = 0, outl2;	424	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	425	ptype type = PT_DATA_UNCOMPRESSED;
324		426
325	#if ENABLE_COMPRESSION	427	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	428	u8 cdata[MAX_MTU];
327	u32 cl;
328		429
		430	if (conn->features & FEATURE_COMPRESSION)
		431	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	432	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		433
330	if (cl)	434	if (cl)
331	{	435	{
332	type = PT_DATA_COMPRESSED;	436	type = PT_DATA_COMPRESSED;
333	d = cdata;	437	d = cdata;
334	l = cl + 2;	438	l = cl + 2;
335		439
336	d[0] = cl >> 8;	440	d[0] = cl >> 8;
337	d[1] = cl;	441	d[1] = cl;
		442	}
338	}	443	}
339	#endif	444	#endif
340		445
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	446	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
342		447
343	struct {	448	struct {
344	#if RAND_SIZE	449	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	450	u8 rnd[RAND_SIZE];
346	#endif	451	#endif
…		…
350	datahdr.seqno = ntohl (seqno);	455	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	456	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	457	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
353	#endif	458	#endif
354		459
355	EVP_EncryptUpdate (cctx,	460	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	461	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	462	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	463	outl += outl2;
359		464
360	EVP_EncryptUpdate (cctx,	465	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	466	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	467	(unsigned char *) d, l));
363	outl += outl2;	468	outl += outl2;
364		469
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	470	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	471	outl += outl2;
367		472
368	len = outl + data_hdr_size ();	473	len = outl + data_hdr_size ();
369		474
370	set_hdr (type, dst);	475	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	484	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	485	tap_packet *p = new tap_packet;
381	u8 *d;	486	u8 *d;
382	u32 l = len - data_hdr_size ();	487	u32 l = len - data_hdr_size ();
383		488
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	489	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
385		490
386	#if ENABLE_COMPRESSION	491	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	492	u8 cdata[MAX_MTU];
388		493
389	if (type == PT_DATA_COMPRESSED)	494	if (type == PT_DATA_COMPRESSED)
…		…
391	else	496	else
392	#endif	497	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	498	d = &(*p)[6 + 6 - DATAHDR];
394		499
395	/* this overwrites part of the src mac, but we fix that later */	500	/* this overwrites part of the src mac, but we fix that later */
396	EVP_DecryptUpdate (cctx,	501	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	502	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	503	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	504	outl += outl2;
400		505
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	506	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	507	outl += outl2;
403		508
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	509	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		510
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	511	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
435	{	540	{
436	// actually, hmaclen cannot be checked because the hmac	541	// actually, hmaclen cannot be checked because the hmac
437	// field comes before this data, so peers with other	542	// field comes before this data, so peers with other
438	// hmacs simply will not work.	543	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	544	u8 prot_major, prot_minor, randsize, hmaclen;
440	u8 flags, challengelen, pad2, pad3;	545	u8 flags, challengelen, features, pad3;
441	u32 cipher_nid, digest_nid, hmac_nid;	546	u32 cipher_nid, digest_nid, hmac_nid;
442
443	const u8 curflags () const
444	{
445	return 0x80
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}
448		547
449	void setup (ptype type, int dst);	548	void setup (ptype type, int dst);
450	bool chk_config () const;	549	bool chk_config () const;
		550
		551	static u8 get_features ()
		552	{
		553	u8 f = 0;
		554	#if ENABLE_COMPRESSION
		555	f \|= FEATURE_COMPRESSION;
		556	#endif
		557	#if ENABLE_ROHC
		558	f \|= FEATURE_ROHC;
		559	#endif
		560	#if ENABLE_BRIDGING
		561	f \|= FEATURE_BRIDGING;
		562	#endif
		563	return f;
		564	}
451	};	565	};
452		566
453	void config_packet::setup (ptype type, int dst)	567	void config_packet::setup (ptype type, int dst)
454	{	568	{
455	prot_major = PROTOCOL_MAJOR;	569	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	570	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	571	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	572	hmaclen = HMACLENGTH;
459	flags = curflags ();	573	flags = 0;
460	challengelen = sizeof (rsachallenge);	574	challengelen = sizeof (rsachallenge);
		575	features = get_features ();
461		576
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	577	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));	578	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	579	hmac_nid = htonl (EVP_MD_type (DIGEST));
465		580
…		…
467	set_hdr (type, dst);	582	set_hdr (type, dst);
468	}	583	}
469		584
470	bool config_packet::chk_config () const	585	bool config_packet::chk_config () const
471	{	586	{
472	return prot_major == PROTOCOL_MAJOR	587	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	588	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	589	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	590	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
		591	else if (hmaclen != HMACLENGTH)
		592	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
476	&& challengelen == sizeof (rsachallenge)	593	else if (challengelen != sizeof (rsachallenge))
		594	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	595	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		596	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))	597	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		598	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));	599	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		600	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		601	else
		602	return true;
		603
		604	return false;
480	}	605	}
481		606
482	struct auth_req_packet : config_packet	607	struct auth_req_packet : config_packet
483	{	608	{
484	char magic[8];	609	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	610	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	611	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	612	u8 pad2, pad3;
488	rsaid id;	613	rsaid id;
489	rsaencrdata encr;	614	rsaencrdata encr;
490		615
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	616	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	617	{
493	config_packet::setup (PT_AUTH_REQ, dst);	618	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	619	strncpy (magic, MAGIC_OLD, 8);
495	initiate = !!initiate_;	620	initiate = !!initiate_;
496	protocols = protocols_;	621	protocols = protocols_;
497		622
498	len = sizeof (*this) - sizeof (net_packet);	623	len = sizeof (*this) - sizeof (net_packet);
499	}	624	}
…		…
546	};	671	};
547		672
548	/////////////////////////////////////////////////////////////////////////////	673	/////////////////////////////////////////////////////////////////////////////
549		674
550	void	675	void
		676	connection::connection_established ()
		677	{
		678	slog (L_NOISE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		679
		680	if (ictx && octx)
		681	{
		682	// make sure rekeying timeouts are slightly asymmetric
		683	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		684	rekey.start (rekey_interval, rekey_interval);
		685	keepalive.start (::conf.keepalive);
		686
		687	// send queued packets
		688	if (ictx && octx)
		689	{
		690	while (tap_packet p = (tap_packet )data_queue.get ())
		691	{
		692	if (p->len) send_data_packet (p);
		693	delete p;
		694	}
		695
		696	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		697	{
		698	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		699	delete p;
		700	}
		701	}
		702
		703	vpn->connection_established (this);
		704	}
		705	else
		706	{
		707	retry_cnt = 0;
		708	establish_connection.start (5);
		709	keepalive.stop ();
		710	rekey.stop ();
		711	}
		712	}
		713
		714	void
551	connection::reset_si ()	715	connection::reset_si ()
552	{	716	{
		717	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	718	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		719	else
555	// mask out protocols we cannot establish	720	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	721	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	722	protocol = 0;
		723	}
558		724
559	si.set (conf, protocol);	725	si.set (conf, protocol);
		726
		727	is_direct = si.valid ();
560	}	728	}
561		729
562	// ensure sockinfo is valid, forward if necessary	730	// ensure sockinfo is valid, forward if necessary
563	const sockinfo &	731	const sockinfo &
564	connection::forward_si (const sockinfo &si) const	732	connection::forward_si (const sockinfo &si) const
565	{	733	{
566	if (!si.valid ())	734	if (!si.valid ())
567	{	735	{
568	connection *r = vpn->find_router ();	736	connection *r = vpn->find_router_for (this);
569		737
570	if (r)	738	if (r)
571	{	739	{
572	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	740	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
573	conf->nodename, r->conf->nodename);	741	conf->nodename, r->conf->nodename);
574	return r->si;	742	return r->si;
575	}	743	}
576	else	744	else
577	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	745	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
578	conf->nodename);	746	conf->nodename);
579	}	747	}
580		748
581	return si;	749	return si;
582	}	750	}
583		751
584	void	752	void
		753	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		754	{
		755	if (!vpn->send_vpn_packet (pkt, si, tos))
		756	reset_connection ();
		757	}
		758
		759	void
585	connection::send_ping (const sockinfo &si, u8 pong)	760	connection::send_ping (const sockinfo &si, u8 pong)
586	{	761	{
587	ping_packet *pkt = new ping_packet;	762	ping_packet *pkt = new ping_packet;
588		763
589	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	764	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		765
		766	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		767
590	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	768	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
591		769
592	delete pkt;	770	delete pkt;
593	}	771	}
594		772
595	void	773	void
…		…
598	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	776	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
599	{	777	{
600	config_packet *pkt = new config_packet;	778	config_packet *pkt = new config_packet;
601		779
602	pkt->setup (vpn_packet::PT_RESET, conf->id);	780	pkt->setup (vpn_packet::PT_RESET, conf->id);
603	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);	781	send_vpn_packet (pkt, si, IPTOS_MINCOST);
604		782
605	delete pkt;	783	delete pkt;
606	}	784	}
607	}	785	}
608		786
…		…
610	connection::send_auth_request (const sockinfo &si, bool initiate)	788	connection::send_auth_request (const sockinfo &si, bool initiate)
611	{	789	{
612	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	790	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
613		791
614	rsachallenge chg;	792	rsachallenge chg;
615
616	rsa_cache.gen (pkt->id, chg);	793	rsa_cache.gen (pkt->id, chg);
		794	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
617		795
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);	796	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
624		797
625	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	798	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
626		799
627	delete pkt;	800	delete pkt;
628	}	801	}
629		802
630	void	803	void
…		…
636		809
637	rsa_hash (id, chg, pkt->response);	810	rsa_hash (id, chg, pkt->response);
638		811
639	pkt->hmac_set (octx);	812	pkt->hmac_set (octx);
640		813
641	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	814	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
642		815
643	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	816	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
644		817
645	delete pkt;	818	delete pkt;
646	}	819	}
647		820
648	void	821	void
649	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	822	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
650	{	823	{
651	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	824	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s)", conf->nodename,
652	conf->id, rid, (const char *)rsi);	825	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi);
653		826
654	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	827	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
655		828
656	r->hmac_set (octx);	829	r->hmac_set (octx);
657	vpn->send_vpn_packet (r, si);	830	send_vpn_packet (r, si);
658		831
659	delete r;	832	delete r;
660	}	833	}
661		834
662	void	835	inline void
663	connection::establish_connection_cb (time_watcher &w)	836	connection::establish_connection_cb (ev::timer &w, int revents)
664	{	837	{
665	if (ictx \|\| conf == THISNODE	838	if (!ictx
		839	&& conf != THISNODE
666	\|\| connectmode == conf_node::C_NEVER	840	&& connectmode != conf_node::C_NEVER
667	\|\| connectmode == conf_node::C_DISABLED)	841	&& connectmode != conf_node::C_DISABLED
668	w.at = TSTAMP_CANCEL;	842	&& !w.is_active ())
669	else if (w.at <= NOW)
670	{	843	{
671	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	844	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
672		845	// and stop trying. should probably be handled by a per-connection expire handler.
673	if (retry_int < 3600 * 8)	846	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		847	{
		848	reset_connection ();
674	retry_cnt++;	849	return;
		850	}
675		851
676	w.at = NOW + retry_int;	852	last_establish_attempt = ev_now ();
		853
		854	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		855	? (retry_cnt & 3) + 1
		856	: 1 << (retry_cnt >> 2));
677		857
678	reset_si ();	858	reset_si ();
679		859
680	if (si.prot && !si.host)	860	bool slow = si.prot & PROT_SLOW;
		861
		862	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		863	{
		864	/TODO/ /* start the timer so we don't recurse endlessly */
		865	w.start (1);
681	vpn->connect_request (conf->id);	866	vpn->send_connect_request (this);
		867	}
682	else	868	else
683	{	869	{
		870	if (si.valid ())
		871	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		872	conf->nodename, (const char *)si);
		873
684	const sockinfo &dsi = forward_si (si);	874	const sockinfo &dsi = forward_si (si);
		875
		876	slow = slow \|\| (dsi.prot & PROT_SLOW);
685		877
686	if (dsi.valid () && auth_rate_limiter.can (dsi))	878	if (dsi.valid () && auth_rate_limiter.can (dsi))
687	{	879	{
688	if (retry_cnt < 4)	880	if (retry_cnt < 4)
689	send_auth_request (dsi, true);	881	send_auth_request (dsi, true);
690	else	882	else
691	send_ping (dsi, 0);	883	send_ping (dsi, 0);
692	}	884	}
693	}	885	}
		886
		887	retry_int *= slow ? 8. : 0.9;
		888
		889	if (retry_int < conf->max_retry)
		890	retry_cnt++;
		891	else
		892	retry_int = conf->max_retry;
		893
		894	w.start (retry_int);
694	}	895	}
695	}	896	}
696		897
697	void	898	void
698	connection::reset_connection ()	899	connection::reset_connection ()
…		…
701	{	902	{
702	slog (L_INFO, _("%s(%s): connection lost"),	903	slog (L_INFO, _("%s(%s): connection lost"),
703	conf->nodename, (const char *)si);	904	conf->nodename, (const char *)si);
704		905
705	if (::conf.script_node_down)	906	if (::conf.script_node_down)
706	run_script (run_script_cb (this, &connection::script_node_down), false);	907	{
		908	run_script_cb *cb = new run_script_cb;
		909	cb->set<connection, &connection::script_node_down> (this);
		910	run_script_queued (cb, _("node-down command execution failed, continuing."));
		911	}
707	}	912	}
708		913
709	delete ictx; ictx = 0;	914	delete ictx; ictx = 0;
710	delete octx; octx = 0;	915	delete octx; octx = 0;
		916	#if ENABLE_DNS
		917	dnsv4_reset_connection ();
		918	#endif
711		919
712	si.host= 0;	920	si.host = 0;
713		921
714	last_activity = 0;	922	last_activity = 0.;
		923	//last_si_change = 0.;
715	retry_cnt = 0;	924	retry_cnt = 0;
716		925
717	rekey.reset ();	926	rekey.stop ();
718	keepalive.reset ();	927	keepalive.stop ();
719	establish_connection.reset ();	928	establish_connection.stop ();
720	}	929	}
721		930
722	void	931	void
723	connection::shutdown ()	932	connection::shutdown ()
724	{	933	{
…		…
726	send_reset (si);	935	send_reset (si);
727		936
728	reset_connection ();	937	reset_connection ();
729	}	938	}
730		939
731	void	940	// poor-man's rekeying
732	connection::rekey_cb (time_watcher &w)	941	inline void
		942	connection::rekey_cb (ev::timer &w, int revents)
733	{	943	{
734	w.at = TSTAMP_CANCEL;
735
736	reset_connection ();	944	reset_connection ();
737	establish_connection ();	945	establish_connection ();
738	}	946	}
739		947
740	void	948	void
741	connection::send_data_packet (tap_packet *pkt, bool broadcast)	949	connection::send_data_packet (tap_packet *pkt)
742	{	950	{
743	vpndata_packet *p = new vpndata_packet;	951	vpndata_packet *p = new vpndata_packet;
744	int tos = 0;	952	int tos = 0;
745		953
746	if (conf->inherit_tos	954	// I am not hilarious about peeking into packets, but so be it.
747	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	955	if (conf->inherit_tos && pkt->is_ipv4 ())
748	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
749	tos = (*pkt)[15] & IPTOS_TOS_MASK;	956	tos = (*pkt)[15] & IPTOS_TOS_MASK;
750		957
751	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	958	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
752	vpn->send_vpn_packet (p, si, tos);	959	send_vpn_packet (p, si, tos);
753		960
754	delete p;	961	delete p;
755		962
756	if (oseqno > MAX_SEQNO)	963	if (oseqno > MAX_SEQNO)
757	rekey ();	964	rekey ();
758	}	965	}
759		966
760	void	967	void
		968	connection::post_inject_queue ()
		969	{
		970	// force a connection every now and when when packets are sent (max 1/s)
		971	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		972	establish_connection.stop ();
		973
		974	establish_connection ();
		975	}
		976
		977	void
761	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	978	connection::inject_data_packet (tap_packet *pkt)
762	{	979	{
763	if (ictx && octx)	980	if (ictx && octx)
764	send_data_packet (pkt, broadcast);	981	send_data_packet (pkt);
765	else	982	else
766	{	983	{
767	if (!broadcast)//DDDD
768	queue.put (new tap_packet (*pkt));	984	data_queue.put (new tap_packet (*pkt));
769		985	post_inject_queue ();
770	establish_connection ();
771	}	986	}
772	}	987	}
773		988
774	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	989	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
775	{	990	{
776	if (ictx && octx)	991	if (ictx && octx)
777	vpn->send_vpn_packet (pkt, si, tos);	992	send_vpn_packet (pkt, si, tos);
778	else	993	else
779	establish_connection ();	994	{
		995	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		996	post_inject_queue ();
		997	}
780	}	998	}
781		999
782	void	1000	void
783	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1001	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
784	{	1002	{
785	last_activity = NOW;	1003	last_activity = ev_now ();
786		1004
787	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1005	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
788	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1006	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1007
		1008	if (connectmode == conf_node::C_DISABLED)
		1009	return;
789		1010
790	switch (pkt->typ ())	1011	switch (pkt->typ ())
791	{	1012	{
792	case vpn_packet::PT_PING:	1013	case vpn_packet::PT_PING:
		1014	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1015
793	// we send pings instead of auth packets after some retries,	1016	// we send pings instead of auth packets after some retries,
794	// so reset the retry counter and establish a connection	1017	// so reset the retry counter and establish a connection
795	// when we receive a ping.	1018	// when we receive a ping.
796	if (!ictx)	1019	if (!(ictx && octx))
797	{	1020	{
798	if (auth_rate_limiter.can (rsi))	1021	if (auth_rate_limiter.can (rsi))
799	send_auth_request (rsi, true);	1022	send_auth_request (rsi, true);
800	}	1023	}
801	else	1024	else
		1025	// we would love to change thre socket address here, but ping's aren't
		1026	// authenticated, so we best ignore it.
802	send_ping (rsi, 1); // pong	1027	send_ping (rsi, 1); // pong
803		1028
804	break;	1029	break;
805		1030
806	case vpn_packet::PT_PONG:	1031	case vpn_packet::PT_PONG:
		1032	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
807	break;	1033	break;
808		1034
809	case vpn_packet::PT_RESET:	1035	case vpn_packet::PT_RESET:
810	{	1036	{
811	reset_connection ();	1037	reset_connection ();
812		1038
813	config_packet p = (config_packet ) pkt;	1039	config_packet p = (config_packet ) pkt;
814		1040
815	if (!p->chk_config ())	1041	if (!p->chk_config ())
816	{	1042	{
817	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	1043	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node."),
818	conf->nodename, (const char *)rsi);	1044	conf->nodename, (const char *)rsi);
819	connectmode = conf_node::C_DISABLED;	1045	connectmode = conf_node::C_DISABLED;
820	}	1046	}
821	else if (connectmode == conf_node::C_ALWAYS)	1047	else if (connectmode == conf_node::C_ALWAYS)
822	establish_connection ();	1048	establish_connection ();
…		…
826	case vpn_packet::PT_AUTH_REQ:	1052	case vpn_packet::PT_AUTH_REQ:
827	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
828	{	1054	{
829	auth_req_packet p = (auth_req_packet ) pkt;	1055	auth_req_packet p = (auth_req_packet ) pkt;
830		1056
831	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1057	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s)", conf->nodename, p->initiate ? "initiate" : "reply");
832		1058
833	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1059	if (p->chk_config ()
		1060	&& (!strncmp (p->magic, MAGIC_OLD, 8) \|\| !strncmp (p->magic, MAGIC, 8)))
834	{	1061	{
835	if (p->prot_minor != PROTOCOL_MINOR)	1062	if (p->prot_minor != PROTOCOL_MINOR)
836	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1063	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
837	conf->nodename, (const char *)rsi,	1064	conf->nodename, (const char *)rsi,
838	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1065	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
…		…
840	if (p->initiate)	1067	if (p->initiate)
841	send_auth_request (rsi, false);	1068	send_auth_request (rsi, false);
842		1069
843	rsachallenge k;	1070	rsachallenge k;
844		1071
845	if (0 > RSA_private_decrypt (sizeof (p->encr),	1072	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
846	(unsigned char )&p->encr, (unsigned char )&k,	1073	{
847	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
848	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1074	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
849	conf->nodename, (const char *)rsi);	1075	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1076	break;
		1077	}
850	else	1078	else
851	{	1079	{
852	retry_cnt = 0;
853	establish_connection.start (NOW + 8); //? ;)
854	keepalive.reset ();
855	rekey.reset ();
856
857	delete ictx;
858	ictx = 0;
859
860	delete octx;	1080	delete octx;
861		1081
862	octx = new crypto_ctx (k, 1);	1082	octx = new crypto_ctx (k, 1);
863	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1083	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
864		1084
865	conf->protocols = p->protocols;	1085	conf->protocols = p->protocols;
		1086	features = p->features & config_packet::get_features ();
		1087
866	send_auth_response (rsi, p->id, k);	1088	send_auth_response (rsi, p->id, k);
		1089
		1090	connection_established ();
867		1091
868	break;	1092	break;
869	}	1093	}
870	}	1094	}
		1095	else
		1096	slog (L_WARN, _("%s(%s): protocol mismatch."),
		1097	conf->nodename, (const char *)rsi);
871		1098
872	send_reset (rsi);	1099	send_reset (rsi);
873	}	1100	}
874		1101
875	break;	1102	break;
876		1103
877	case vpn_packet::PT_AUTH_RES:	1104	case vpn_packet::PT_AUTH_RES:
878	{	1105	{
879	auth_res_packet p = (auth_res_packet ) pkt;	1106	auth_res_packet p = (auth_res_packet )pkt;
880		1107
881	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1108	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
882		1109
883	if (p->chk_config ())	1110	if (p->chk_config ())
884	{	1111	{
885	if (p->prot_minor != PROTOCOL_MINOR)	1112	if (p->prot_minor != PROTOCOL_MINOR)
886	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1113	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
…		…
888	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1115	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
889		1116
890	rsachallenge chg;	1117	rsachallenge chg;
891		1118
892	if (!rsa_cache.find (p->id, chg))	1119	if (!rsa_cache.find (p->id, chg))
		1120	{
893	slog (L_ERR, _("%s(%s): unrequested auth response"),	1121	slog (L_ERR, _("%s(%s): unrequested auth response, ignoring."),
894	conf->nodename, (const char *)rsi);	1122	conf->nodename, (const char *)rsi);
		1123	break;
		1124	}
895	else	1125	else
896	{	1126	{
897	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1127	crypto_ctx *cctx = new crypto_ctx (chg, 0);
898		1128
899	if (!p->hmac_chk (cctx))	1129	if (!p->hmac_chk (cctx))
		1130	{
900	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1131	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
901	"could be an attack, or just corruption or an synchronization error"),	1132	"could be an attack, or just corruption or a synchronization error."),
902	conf->nodename, (const char *)rsi);	1133	conf->nodename, (const char *)rsi);
		1134	break;
		1135	}
903	else	1136	else
904	{	1137	{
905	rsaresponse h;	1138	rsaresponse h;
906		1139
907	rsa_hash (p->id, chg, h);	1140	rsa_hash (p->id, chg, h);
…		…
915	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1148	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
916		1149
917	si = rsi;	1150	si = rsi;
918	protocol = rsi.prot;	1151	protocol = rsi.prot;
919		1152
920	rekey.start (NOW + ::conf.rekey);	1153	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
921	keepalive.start (NOW + ::conf.keepalive);	1154	conf->nodename, (const char *)rsi,
		1155	is_direct ? "direct" : "forwarded",
		1156	p->prot_major, p->prot_minor);
922		1157
923	// send queued packets	1158	connection_established ();
924	while (tap_packet *p = queue.get ())	1159
		1160	if (::conf.script_node_up)
925	{	1161	{
926	send_data_packet (p);	1162	run_script_cb *cb = new run_script_cb;
927	delete p;	1163	cb->set<connection, &connection::script_node_up> (this);
		1164	run_script_queued (cb, _("node-up command execution failed, continuing."));
928	}	1165	}
929
930	connectmode = conf->connectmode;
931
932	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
933	conf->nodename, (const char *)rsi,
934	p->prot_major, p->prot_minor);
935
936	if (::conf.script_node_up)
937	run_script (run_script_cb (this, &connection::script_node_up), false);
938		1166
939	break;	1167	break;
940	}	1168	}
941	else	1169	else
942	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1170	slog (L_ERR, _("%s(%s): sent and received challenge do not match."),
943	conf->nodename, (const char *)rsi);	1171	conf->nodename, (const char *)rsi);
944	}	1172	}
945		1173
946	delete cctx;	1174	delete cctx;
947	}	1175	}
…		…
961		1189
962	if (ictx && octx)	1190	if (ictx && octx)
963	{	1191	{
964	vpndata_packet p = (vpndata_packet )pkt;	1192	vpndata_packet p = (vpndata_packet )pkt;
965		1193
966	if (rsi == si)	1194	if (!p->hmac_chk (ictx))
		1195	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1196	"could be an attack, or just corruption or a synchronization error."),
		1197	conf->nodename, (const char *)rsi);
		1198	else
967	{	1199	{
968	if (!p->hmac_chk (ictx))
969	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
970	"could be an attack, or just corruption or an synchronization error"),
971	conf->nodename, (const char *)rsi);
972	else	1200	u32 seqno;
		1201	tap_packet *d = p->unpack (this, seqno);
		1202	int seqclass = iseqno.seqno_classify (seqno);
		1203
		1204	if (seqclass == 0) // ok
973	{	1205	{
974	u32 seqno;	1206	vpn->tap->send (d);
975	tap_packet *d = p->unpack (this, seqno);
976		1207
977	if (iseqno.recv_ok (seqno))	1208	if (si != rsi)
978	{	1209	{
979	vpn->tap->send (d);	1210	// fast re-sync on source address changes, useful especially for tcp/ip
		1211	//if (last_si_change < ev_now () + 5.)
		1212	// {
		1213	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1214	conf->nodename, (const char )si, (const char )rsi);
980		1215
981	if (p->dst () == 0) // re-broadcast	1216	si = rsi;
982	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1217
		1218	if (::conf.script_node_change)
983	{	1219	{
984	connection c = i;	1220	run_script_cb *cb = new run_script_cb;
985		1221	cb->set<connection, &connection::script_node_change> (this);
986	if (c->conf != THISNODE && c->conf != conf)	1222	run_script_queued (cb, _("node-change command execution failed, continuing."));
987	c->inject_data_packet (d);
988	}	1223	}
989		1224
		1225	// }
990	delete d;	1226	//else
991		1227	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
992	break;	1228	// conf->nodename, (const char )si, (const char )rsi);
993	}	1229	}
994	}	1230	}
		1231	else if (seqclass == 1) // far history
		1232	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1233	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1234	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1235	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1236	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1237	else if (seqclass == 3) // reset
		1238	{
		1239	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1240	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1241	send_reset (rsi);
		1242	}
		1243
		1244	delete d;
		1245	break;
995	}	1246	}
996	else
997	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
998	}	1247	}
999		1248
1000	send_reset (rsi);	1249	send_reset (rsi);
1001	break;	1250	break;
1002		1251
1003	case vpn_packet::PT_CONNECT_REQ:	1252	case vpn_packet::PT_CONNECT_REQ:
1004	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1253	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1005	{	1254	{
1006	connect_req_packet p = (connect_req_packet ) pkt;	1255	connect_req_packet p = (connect_req_packet )pkt;
1007		1256
1008	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1257	if (p->id > 0 && p->id <= vpn->conns.size ())
1009	connection *c = vpn->conns[p->id - 1];
1010	conf->protocols = p->protocols;
1011
1012	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1013	conf->id, p->id, c->ictx && c->octx);
1014
1015	if (c->ictx && c->octx)
1016	{	1258	{
		1259	connection *c = vpn->conns[p->id - 1];
		1260	conf->protocols = p->protocols;
		1261
		1262	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s) [%d]",
		1263	conf->nodename, vpn->conns[p->id - 1]->conf->nodename, c->ictx && c->octx);
		1264
		1265	if (c->ictx && c->octx)
		1266	{
1017	// send connect_info packets to both sides, in case one is	1267	// send connect_info packets to both sides, in case one is
1018	// behind a nat firewall (or both ;)	1268	// behind a nat firewall (or both ;)
1019	c->send_connect_info (conf->id, si, conf->protocols);	1269	c->send_connect_info (conf->id, si, conf->protocols);
1020	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1270	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1271	}
		1272	else
		1273	c->establish_connection ();
1021	}	1274	}
		1275	else
		1276	slog (L_WARN,
		1277	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1278	p->id);
1022	}	1279	}
1023		1280
1024	break;	1281	break;
1025		1282
1026	case vpn_packet::PT_CONNECT_INFO:	1283	case vpn_packet::PT_CONNECT_INFO:
1027	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1284	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1028	{	1285	{
1029	connect_info_packet p = (connect_info_packet ) pkt;	1286	connect_info_packet p = (connect_info_packet )pkt;
1030		1287
1031	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1288	if (p->id > 0 && p->id <= vpn->conns.size ())
1032		1289	{
1033	connection *c = vpn->conns[p->id - 1];	1290	connection *c = vpn->conns[p->id - 1];
1034		1291
1035	c->conf->protocols = p->protocols;	1292	c->conf->protocols = p->protocols;
1036	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1293	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1037	p->si.upgrade_protocol (protocol, c->conf);	1294	p->si.upgrade_protocol (protocol, c->conf);
1038		1295
1039	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1296	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s) [%d]",
		1297	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
1040	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1298	(const char *)p->si, !c->ictx && !c->octx);
1041		1299
1042	const sockinfo &dsi = forward_si (p->si);	1300	const sockinfo &dsi = forward_si (p->si);
1043		1301
1044	if (dsi.valid ())	1302	if (dsi.valid ())
1045	c->send_auth_request (dsi, true);	1303	c->send_auth_request (dsi, true);
		1304	}
		1305	else
		1306	slog (L_WARN,
		1307	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1308	p->id);
1046	}	1309	}
1047		1310
1048	break;	1311	break;
1049		1312
1050	default:	1313	default:
1051	send_reset (rsi);	1314	send_reset (rsi);
1052	break;	1315	break;
1053	}	1316	}
1054	}	1317	}
1055		1318
1056	void connection::keepalive_cb (time_watcher &w)	1319	inline void
		1320	connection::keepalive_cb (ev::timer &w, int revents)
1057	{	1321	{
1058	if (NOW >= last_activity + ::conf.keepalive + 30)	1322	if (ev_now () >= last_activity + ::conf.keepalive + 15)
1059	{	1323	{
1060	reset_connection ();	1324	reset_connection ();
1061	establish_connection ();	1325	establish_connection ();
1062	}	1326	}
1063	else if (NOW < last_activity + ::conf.keepalive)	1327	else if (ev_now () < last_activity + ::conf.keepalive)
1064	w.at = last_activity + ::conf.keepalive;	1328	w.start (last_activity + ::conf.keepalive - ev::now ());
1065	else if (conf->connectmode != conf_node::C_ONDEMAND	1329	else if (conf->connectmode != conf_node::C_ONDEMAND
1066	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1330	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1067	{	1331	{
1068	send_ping (si);	1332	send_ping (si);
1069	w.at = NOW + 5;	1333	w.start (3);
1070	}	1334	}
		1335	else if (ev_now () < last_activity + ::conf.keepalive + 10)
		1336	// hold ondemand connections implicitly a few seconds longer
		1337	// should delete octx, though, or something like that ;)
		1338	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1071	else	1339	else
1072	reset_connection ();	1340	reset_connection ();
1073	}	1341	}
1074		1342
1075	void connection::connect_request (int id)	1343	void connection::send_connect_request (int id)
1076	{	1344	{
1077	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1345	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1078		1346
1079	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1347	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s)",
		1348	conf->nodename, vpn->conns[id - 1]->conf->nodename);
1080	p->hmac_set (octx);	1349	p->hmac_set (octx);
1081	vpn->send_vpn_packet (p, si);	1350	send_vpn_packet (p, si);
1082		1351
1083	delete p;	1352	delete p;
1084	}	1353	}
1085		1354
1086	void connection::script_node ()	1355	void connection::script_init_env (const char *ext)
1087	{	1356	{
1088	vpn->script_if_up ();
1089
1090	char *env;	1357	char *env;
		1358	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1359	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1360	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1361	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1362	conf->id & 0xff); putenv (env);
		1363	}
		1364
		1365	void connection::script_init_connect_env ()
		1366	{
		1367	vpn->script_init_env ();
		1368
		1369	char *env;
1091	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1370	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1371	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1092	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1372	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1093	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1373	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1094	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1374	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1095	}	1375	}
1096		1376
		1377	inline const char *
1097	const char *connection::script_node_up ()	1378	connection::script_node_up ()
1098	{	1379	{
1099	script_node ();	1380	script_init_connect_env ();
1100		1381
1101	putenv ("STATE=up");	1382	putenv ((char *)"STATE=up");
1102		1383
		1384	char *filename;
		1385	asprintf (&filename,
		1386	"%s/%s",
		1387	confbase,
1103	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1388	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1104	}
1105		1389
		1390	return filename;
		1391	}
		1392
		1393	inline const char *
		1394	connection::script_node_change ()
		1395	{
		1396	script_init_connect_env ();
		1397
		1398	putenv ((char *)"STATE=change");
		1399
		1400	char *filename;
		1401	asprintf (&filename,
		1402	"%s/%s",
		1403	confbase,
		1404	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1405
		1406	return filename;
		1407	}
		1408
		1409	inline const char *
1106	const char *connection::script_node_down ()	1410	connection::script_node_down ()
1107	{	1411	{
1108	script_node ();	1412	script_init_connect_env ();
1109		1413
1110	putenv ("STATE=down");	1414	putenv ((char *)"STATE=down");
1111		1415
1112	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1416	char *filename;
1113	}	1417	asprintf (&filename,
		1418	"%s/%s",
		1419	confbase,
		1420	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1114		1421
		1422	return filename;
		1423	}
		1424
1115	connection::connection(struct vpn *vpn_)	1425	connection::connection (struct vpn vpn, conf_node conf)
1116	: vpn(vpn_)	1426	: vpn(vpn), conf(conf),
1117	, rekey (this, &connection::rekey_cb)	1427	#if ENABLE_DNS
1118	, keepalive (this, &connection::keepalive_cb)	1428	dns (0),
		1429	#endif
		1430	data_queue(conf->max_ttl, conf->max_queue + 1),
		1431	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1432	{
		1433	rekey .set<connection, &connection::rekey_cb > (this);
		1434	keepalive .set<connection, &connection::keepalive_cb > (this);
1119	, establish_connection (this, &connection::establish_connection_cb)	1435	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1120	{	1436
		1437	last_establish_attempt = 0.;
1121	octx = ictx = 0;	1438	octx = ictx = 0;
1122	retry_cnt = 0;
1123		1439
1124	connectmode = conf_node::C_ALWAYS; // initial setting	1440	if (!conf->protocols) // make sure some protocol is enabled
		1441	conf->protocols = PROT_UDPv4;
		1442
		1443	connectmode = conf->connectmode;
		1444
		1445	// queue a dummy packet to force an initial connection attempt
		1446	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1447	vpn_queue.put (new net_packet);
		1448
1125	reset_connection ();	1449	reset_connection ();
1126	}	1450	}
1127		1451
1128	connection::~connection ()	1452	connection::~connection ()
1129	{	1453	{

Diff Legend

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

Comparing gvpe/src/connection.C (file contents): Revision 1.9 by pcg, Sun Apr 6 04:31:51 2003 UTC vs. Revision 1.87 by pcg, Fri Nov 12 18:39:33 2010 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.9 by pcg, Sun Apr 6 04:31:51 2003 UTC vs.
Revision 1.87 by pcg, Fri Nov 12 18:39:33 2010 UTC