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

Comparing gvpe/src/connection.C (file contents):
Revision 1.24 by pcg, Wed Oct 22 01:05:23 2003 UTC vs.
Revision 1.58 by pcg, Sat Jul 9 02:35:42 2005 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
6	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
7	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
8	(at your option) any later version.	10	(at your option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13	GNU General Public License for more details.	15	GNU General Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
16	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18	*/	20	*/
19		21
20	#include "config.h"	22	#include "config.h"
21
22	extern "C" {
23	# include "lzf/lzf.h"
24	}
25		23
26	#include <list>	24	#include <list>
27		25
28	#include <openssl/rand.h>	26	#include <openssl/rand.h>
29	#include <openssl/evp.h>	27	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	28	#include <openssl/rsa.h>
31	#include <openssl/err.h>	29	#include <openssl/err.h>
32
33	#include "gettext.h"
34		30
35	#include "conf.h"	31	#include "conf.h"
36	#include "slog.h"	32	#include "slog.h"
37	#include "device.h"	33	#include "device.h"
38	#include "vpn.h"	34	#include "vpn.h"
44	# define RAND_pseudo_bytes RAND_bytes	40	# define RAND_pseudo_bytes RAND_bytes
45	#endif	41	#endif
46		42
47	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
48		44
		45	#define ULTRA_FAST 1
		46	#define HLOG 15
		47	#include "lzf/lzf.h"
		48	#include "lzf/lzf_c.c"
		49	#include "lzf/lzf_d.c"
		50
49	struct crypto_ctx	51	struct crypto_ctx
50	{	52	{
51	EVP_CIPHER_CTX cctx;	53	EVP_CIPHER_CTX cctx;
52	HMAC_CTX hctx;	54	HMAC_CTX hctx;
53		55
…		…
56	};	58	};
57		59
58	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
59	{	61	{
60	EVP_CIPHER_CTX_init (&cctx);	62	EVP_CIPHER_CTX_init (&cctx);
61	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
62	HMAC_CTX_init (&hctx);	64	HMAC_CTX_init (&hctx);
63	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
64	}	66	}
65		67
66	crypto_ctx::~crypto_ctx ()	68	crypto_ctx::~crypto_ctx ()
67	{	69	{
68	EVP_CIPHER_CTX_cleanup (&cctx);	70	require (EVP_CIPHER_CTX_cleanup (&cctx));
69	HMAC_CTX_cleanup (&hctx);	71	HMAC_CTX_cleanup (&hctx);
70	}	72	}
71		73
72	static void	74	static void
73	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
74	{	76	{
75	EVP_MD_CTX ctx;	77	EVP_MD_CTX ctx;
76		78
77	EVP_MD_CTX_init (&ctx);	79	EVP_MD_CTX_init (&ctx);
78	EVP_DigestInit (&ctx, RSA_HASH);	80	require (EVP_DigestInit (&ctx, RSA_HASH));
79	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
80	EVP_DigestUpdate(&ctx, &id, sizeof id);	82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
81	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
82	EVP_MD_CTX_cleanup (&ctx);	84	EVP_MD_CTX_cleanup (&ctx);
83	}	85	}
84		86
85	struct rsa_entry {	87	struct rsa_entry {
86	tstamp expire;	88	tstamp expire;
…		…
91	struct rsa_cache : list<rsa_entry>	93	struct rsa_cache : list<rsa_entry>
92	{	94	{
93	void cleaner_cb (time_watcher &w); time_watcher cleaner;	95	void cleaner_cb (time_watcher &w); time_watcher cleaner;
94		96
95	bool find (const rsaid &id, rsachallenge &chg)	97	bool find (const rsaid &id, rsachallenge &chg)
96	{	98	{
97	for (iterator i = begin (); i != end (); ++i)	99	for (iterator i = begin (); i != end (); ++i)
98	{	100	{
99	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
100	{	102	{
101	memcpy (&chg, &i->chg, sizeof chg);	103	memcpy (&chg, &i->chg, sizeof chg);
102		104
103	erase (i);	105	erase (i);
104	return true;	106	return true;
105	}	107	}
106	}	108	}
107		109
108	if (cleaner.at < NOW)	110	if (cleaner.at < NOW)
109	cleaner.start (NOW + RSA_TTL);	111	cleaner.start (NOW + RSA_TTL);
110		112
111	return false;	113	return false;
112	}	114	}
113		115
114	void gen (rsaid &id, rsachallenge &chg)	116	void gen (rsaid &id, rsachallenge &chg)
115	{	117	{
116	rsa_entry e;	118	rsa_entry e;
117		119
118	RAND_bytes ((unsigned char *)&id, sizeof id);	120	RAND_bytes ((unsigned char *)&id, sizeof id);
119	RAND_bytes ((unsigned char *)&chg, sizeof chg);	121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
120		122
121	e.expire = NOW + RSA_TTL;	123	e.expire = NOW + RSA_TTL;
122	e.id = id;	124	e.id = id;
123	memcpy (&e.chg, &chg, sizeof chg);	125	memcpy (&e.chg, &chg, sizeof chg);
124		126
125	push_back (e);	127	push_back (e);
126		128
127	if (cleaner.at < NOW)	129	if (cleaner.at < NOW)
128	cleaner.start (NOW + RSA_TTL);	130	cleaner.start (NOW + RSA_TTL);
129	}	131	}
130		132
131	rsa_cache ()	133	rsa_cache ()
132	: cleaner (this, &rsa_cache::cleaner_cb)	134	: cleaner (this, &rsa_cache::cleaner_cb)
133	{ }	135	{ }
134		136
135	} rsa_cache;	137	} rsa_cache;
136		138
137	void rsa_cache::cleaner_cb (time_watcher &w)	139	void rsa_cache::cleaner_cb (time_watcher &w)
138	{	140	{
139	if (empty ())	141	if (!empty ())
140	w.at = TSTAMP_CANCEL;
141	else
142	{	142	{
143	w.at = NOW + RSA_TTL;	143	w.start (NOW + RSA_TTL);
144		144
145	for (iterator i = begin (); i != end (); )	145	for (iterator i = begin (); i != end (); )
146	if (i->expire <= NOW)	146	if (i->expire <= NOW)
147	i = erase (i);	147	i = erase (i);
148	else	148	else
…		…
200	// only do action once every x seconds per host whole allowing bursts.	200	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	201	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	202	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	203	struct net_rate_limiter : list<net_rateinfo>
204	{	204	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	205	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	206	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	207	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	208	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		209
210	bool can (const sockinfo &si) { return can((u32)si.host); }	210	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	211	bool can (u32 host);
212	};	212	};
213		213
…		…
218	iterator i;	218	iterator i;
219		219
220	for (i = begin (); i != end (); )	220	for (i = begin (); i != end (); )
221	if (i->host == host)	221	if (i->host == host)
222	break;	222	break;
223	else if (i->last < NOW - EXPIRE)	223	else if (i->last < NOW - NRL_EXPIRE)
224	i = erase (i);	224	i = erase (i);
225	else	225	else
226	i++;	226	i++;
227		227
228	if (i == end ())	228	if (i == end ())
229	{	229	{
230	net_rateinfo ri;	230	net_rateinfo ri;
231		231
232	ri.host = host;	232	ri.host = host;
233	ri.pcnt = 1.;	233	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	234	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	235	ri.last = NOW;
236		236
237	push_front (ri);	237	push_front (ri);
238		238
239	return true;	239	return true;
…		…
241	else	241	else
242	{	242	{
243	net_rateinfo ri (*i);	243	net_rateinfo ri (*i);
244	erase (i);	244	erase (i);
245		245
246	ri.pcnt = ri.pcnt * ALPHA;	246	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	247	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
248		248
249	ri.last = NOW;	249	ri.last = NOW;
250		250
251	double dif = ri.diff / ri.pcnt;	251	double dif = ri.diff / ri.pcnt;
252		252
253	bool send = dif > CUTOFF;	253	bool send = dif > NRL_CUTOFF;
254		254
255	if (dif > MAXDIF)	255	if (dif > NRL_MAXDIF)
256	{	256	{
257	ri.pcnt = 1.;	257	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	258	ri.diff = NRL_MAXDIF;
259	}	259	}
260	else if (send)	260	else if (send)
261	ri.pcnt++;	261	ri.pcnt++;
262		262
263	push_front (ri);	263	push_front (ri);
…		…
310	}	310	}
311		311
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	312	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)	313	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		314
315	struct vpndata_packet:vpn_packet	315	struct vpndata_packet : vpn_packet
316	{	316	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno	317	u8 data[MAXVPNDATA + DATAHDR]; // seqno
318		318
319	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	319	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
320	tap_packet unpack (connection conn, u32 &seqno);	320	tap_packet unpack (connection conn, u32 &seqno);
…		…
333	int outl = 0, outl2;	333	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	334	ptype type = PT_DATA_UNCOMPRESSED;
335		335
336	#if ENABLE_COMPRESSION	336	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	337	u8 cdata[MAX_MTU];
338	u32 cl;
339		338
		339	if (conn->features & ENABLE_COMPRESSION)
		340	{
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	341	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		342
341	if (cl)	343	if (cl)
342	{	344	{
343	type = PT_DATA_COMPRESSED;	345	type = PT_DATA_COMPRESSED;
344	d = cdata;	346	d = cdata;
345	l = cl + 2;	347	l = cl + 2;
346		348
347	d[0] = cl >> 8;	349	d[0] = cl >> 8;
348	d[1] = cl;	350	d[1] = cl;
		351	}
349	}	352	}
350	#endif	353	#endif
351		354
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	355	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
353		356
354	struct {	357	struct {
355	#if RAND_SIZE	358	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];	359	u8 rnd[RAND_SIZE];
357	#endif	360	#endif
…		…
361	datahdr.seqno = ntohl (seqno);	364	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE	365	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	366	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
364	#endif	367	#endif
365		368
366	EVP_EncryptUpdate (cctx,	369	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	370	(unsigned char *) data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	371	(unsigned char *) &datahdr, DATAHDR));
369	outl += outl2;	372	outl += outl2;
370		373
371	EVP_EncryptUpdate (cctx,	374	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	375	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) d, l);	376	(unsigned char *) d, l));
374	outl += outl2;	377	outl += outl2;
375		378
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	379	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
377	outl += outl2;	380	outl += outl2;
378		381
379	len = outl + data_hdr_size ();	382	len = outl + data_hdr_size ();
380		383
381	set_hdr (type, dst);	384	set_hdr (type, dst);
…		…
390	int outl = 0, outl2;	393	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	394	tap_packet *p = new tap_packet;
392	u8 *d;	395	u8 *d;
393	u32 l = len - data_hdr_size ();	396	u32 l = len - data_hdr_size ();
394		397
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	398	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
396		399
397	#if ENABLE_COMPRESSION	400	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	401	u8 cdata[MAX_MTU];
399		402
400	if (type == PT_DATA_COMPRESSED)	403	if (type == PT_DATA_COMPRESSED)
…		…
402	else	405	else
403	#endif	406	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	407	d = &(*p)[6 + 6 - DATAHDR];
405		408
406	/* this overwrites part of the src mac, but we fix that later */	409	/* this overwrites part of the src mac, but we fix that later */
407	EVP_DecryptUpdate (cctx,	410	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	411	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	412	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	413	outl += outl2;
411		414
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	415	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	416	outl += outl2;
414		417
415	seqno = ntohl ((u32 )(d + RAND_SIZE));	418	seqno = ntohl ((u32 )(d + RAND_SIZE));
416		419
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	420	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
446	{	449	{
447	// actually, hmaclen cannot be checked because the hmac	450	// actually, hmaclen cannot be checked because the hmac
448	// field comes before this data, so peers with other	451	// field comes before this data, so peers with other
449	// hmacs simply will not work.	452	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	453	u8 prot_major, prot_minor, randsize, hmaclen;
451	u8 flags, challengelen, pad2, pad3;	454	u8 flags, challengelen, features, pad3;
452	u32 cipher_nid, digest_nid, hmac_nid;	455	u32 cipher_nid, digest_nid, hmac_nid;
453
454	const u8 curflags () const
455	{
456	return 0x80
457	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}
459		456
460	void setup (ptype type, int dst);	457	void setup (ptype type, int dst);
461	bool chk_config () const;	458	bool chk_config () const;
		459
		460	static u8 get_features ()
		461	{
		462	u8 f = 0;
		463	#if ENABLE_COMPRESSION
		464	f \|= FEATURE_COMPRESSION;
		465	#endif
		466	#if ENABLE_ROHC
		467	f \|= FEATURE_ROHC;
		468	#endif
		469	return f;
		470	}
462	};	471	};
463		472
464	void config_packet::setup (ptype type, int dst)	473	void config_packet::setup (ptype type, int dst)
465	{	474	{
466	prot_major = PROTOCOL_MAJOR;	475	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	476	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	477	randsize = RAND_SIZE;
469	hmaclen = HMACLENGTH;	478	hmaclen = HMACLENGTH;
470	flags = curflags ();	479	flags = 0;
471	challengelen = sizeof (rsachallenge);	480	challengelen = sizeof (rsachallenge);
		481	features = get_features ();
472		482
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	483	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));	484	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	hmac_nid = htonl (EVP_MD_type (DIGEST));	485	hmac_nid = htonl (EVP_MD_type (DIGEST));
476		486
…		…
484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	494	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
485	else if (randsize != RAND_SIZE)	495	else if (randsize != RAND_SIZE)
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	496	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487	else if (hmaclen != HMACLENGTH)	497	else if (hmaclen != HMACLENGTH)
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);	498	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))	499	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));	500	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	501	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	502	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	503	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
…		…
504		512
505	struct auth_req_packet : config_packet	513	struct auth_req_packet : config_packet
506	{	514	{
507	char magic[8];	515	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	516	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will get patches on forward)	517	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	518	u8 pad2, pad3;
511	rsaid id;	519	rsaid id;
512	rsaencrdata encr;	520	rsaencrdata encr;
513		521
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	522	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
575	{	583	{
576	if (ictx && octx)	584	if (ictx && octx)
577	{	585	{
578	connectmode = conf->connectmode;	586	connectmode = conf->connectmode;
579		587
		588	// make sure rekeying timeouts are slightly asymmetric
580	rekey.start (NOW + ::conf.rekey);	589	rekey.start (NOW + ::conf.rekey
		590	+ (conf->id > THISNODE->id ? 10 : 0));
581	keepalive.start (NOW + ::conf.keepalive);	591	keepalive.start (NOW + ::conf.keepalive);
582		592
583	// send queued packets	593	// send queued packets
584	if (ictx && octx)	594	if (ictx && octx)
585	{	595	{
…		…
598	}	608	}
599	else	609	else
600	{	610	{
601	retry_cnt = 0;	611	retry_cnt = 0;
602	establish_connection.start (NOW + 5);	612	establish_connection.start (NOW + 5);
603	keepalive.reset ();	613	keepalive.stop ();
604	rekey.reset ();	614	rekey.stop ();
605	}	615	}
606	}	616	}
607		617
608	void	618	void
609	connection::reset_si ()	619	connection::reset_si ()
…		…
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);	621	protocol = best_protocol (THISNODE->protocols & conf->protocols);
612		622
613	// mask out protocols we cannot establish	623	// mask out protocols we cannot establish
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	624	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	625	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		626	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
616		627
617	si.set (conf, protocol);	628	si.set (conf, protocol);
618	}	629	}
619		630
620	// ensure sockinfo is valid, forward if necessary	631	// ensure sockinfo is valid, forward if necessary
…		…
625	{	636	{
626	connection *r = vpn->find_router ();	637	connection *r = vpn->find_router ();
627		638
628	if (r)	639	if (r)
629	{	640	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	641	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
631	conf->nodename, r->conf->nodename);	642	conf->nodename, r->conf->nodename, (const char *)r->si);
632	return r->si;	643	return r->si;
633	}	644	}
634	else	645	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	646	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
636	conf->nodename);	647	conf->nodename);
…		…
706	}	717	}
707		718
708	void	719	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	720	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	721	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	722	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",
712	conf->id, rid, (const char *)rsi);	723	conf->id, rid, (const char *)rsi);
713		724
714	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	725	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
715		726
716	r->hmac_set (octx);	727	r->hmac_set (octx);
…		…
720	}	731	}
721		732
722	void	733	void
723	connection::establish_connection_cb (time_watcher &w)	734	connection::establish_connection_cb (time_watcher &w)
724	{	735	{
725	if (ictx \|\| conf == THISNODE	736	if (!ictx
		737	&& conf != THISNODE
726	\|\| connectmode == conf_node::C_NEVER	738	&& connectmode != conf_node::C_NEVER
727	\|\| connectmode == conf_node::C_DISABLED)	739	&& connectmode != conf_node::C_DISABLED
728	w.at = TSTAMP_CANCEL;	740	&& NOW > w.at)
729	else if (w.at <= NOW)
730	{	741	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	742	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion
732		743
733	if (retry_int < 3600 * 8)	744	double retry_int = double (retry_cnt & 3
734	retry_cnt++;	745	? (retry_cnt & 3) + 1
735		746	: 1 << (retry_cnt >> 2));
736	w.at = NOW + retry_int;
737		747
738	reset_si ();	748	reset_si ();
		749
		750	bool slow = si.prot & PROT_SLOW;
739		751
740	if (si.prot && !si.host)	752	if (si.prot && !si.host)
741	vpn->send_connect_request (conf->id);	753	vpn->send_connect_request (conf->id);
742	else	754	else
743	{	755	{
744	const sockinfo &dsi = forward_si (si);	756	const sockinfo &dsi = forward_si (si);
		757
		758	slow = slow \|\| (dsi.prot & PROT_SLOW);
745		759
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	760	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	761	{
748	if (retry_cnt < 4)	762	if (retry_cnt < 4)
749	send_auth_request (dsi, true);	763	send_auth_request (dsi, true);
750	else	764	else
751	send_ping (dsi, 0);	765	send_ping (dsi, 0);
752	}	766	}
753	}	767	}
		768
		769	retry_int *= slow ? 8. : 0.7;
		770
		771	if (retry_int < conf->max_retry)
		772	retry_cnt++;
		773	else
		774	retry_int = conf->max_retry;
		775
		776	w.start (NOW + retry_int);
754	}	777	}
755	}	778	}
756		779
757	void	780	void
758	connection::reset_connection ()	781	connection::reset_connection ()
…		…
761	{	784	{
762	slog (L_INFO, _("%s(%s): connection lost"),	785	slog (L_INFO, _("%s(%s): connection lost"),
763	conf->nodename, (const char *)si);	786	conf->nodename, (const char *)si);
764		787
765	if (::conf.script_node_down)	788	if (::conf.script_node_down)
766	run_script (run_script_cb (this, &connection::script_node_down), false);	789	if (!run_script (run_script_cb (this, &connection::script_node_down), false))
		790	slog (L_WARN, _("node-down command execution failed, continuing."));
767	}	791	}
768		792
769	delete ictx; ictx = 0;	793	delete ictx; ictx = 0;
770	delete octx; octx = 0;	794	delete octx; octx = 0;
		795	#if ENABLE_DNS
		796	dnsv4_reset_connection ();
		797	#endif
771		798
772	si.host= 0;	799	si.host = 0;
773		800
774	last_activity = 0;	801	last_activity = 0;
775	retry_cnt = 0;	802	retry_cnt = 0;
776		803
777	rekey.reset ();	804	rekey.stop ();
778	keepalive.reset ();	805	keepalive.stop ();
779	establish_connection.reset ();	806	establish_connection.stop ();
780	}	807	}
781		808
782	void	809	void
783	connection::shutdown ()	810	connection::shutdown ()
784	{	811	{
…		…
789	}	816	}
790		817
791	void	818	void
792	connection::rekey_cb (time_watcher &w)	819	connection::rekey_cb (time_watcher &w)
793	{	820	{
794	w.at = TSTAMP_CANCEL;
795
796	reset_connection ();	821	reset_connection ();
797	establish_connection ();	822	establish_connection ();
798	}	823	}
799		824
800	void	825	void
…		…
821	{	846	{
822	if (ictx && octx)	847	if (ictx && octx)
823	send_data_packet (pkt);	848	send_data_packet (pkt);
824	else	849	else
825	{	850	{
826	if (!broadcast)//DDDD	851	if (!broadcast)
827	data_queue.put (new tap_packet (*pkt));	852	data_queue.put (new tap_packet (*pkt));
828		853
829	establish_connection ();	854	establish_connection ();
830	}	855	}
831	}	856	}
…		…
834	{	859	{
835	if (ictx && octx)	860	if (ictx && octx)
836	send_vpn_packet (pkt, si, tos);	861	send_vpn_packet (pkt, si, tos);
837	else	862	else
838	{	863	{
839	vpn_queue.put (new vpn_packet (*pkt));	864	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
840		865
841	establish_connection ();	866	establish_connection ();
842	}	867	}
843	}	868	}
844		869
…		…
917		942
918	octx = new crypto_ctx (k, 1);	943	octx = new crypto_ctx (k, 1);
919	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	944	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
920		945
921	conf->protocols = p->protocols;	946	conf->protocols = p->protocols;
		947	features = p->features & config_packet::get_features ();
922		948
923	send_auth_response (rsi, p->id, k);	949	send_auth_response (rsi, p->id, k);
924		950
925	connection_established ();	951	connection_established ();
926		952
…		…
962	crypto_ctx *cctx = new crypto_ctx (chg, 0);	988	crypto_ctx *cctx = new crypto_ctx (chg, 0);
963		989
964	if (!p->hmac_chk (cctx))	990	if (!p->hmac_chk (cctx))
965	{	991	{
966	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	992	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
967	"could be an attack, or just corruption or an synchronization error"),	993	"could be an attack, or just corruption or a synchronization error"),
968	conf->nodename, (const char *)rsi);	994	conf->nodename, (const char *)rsi);
969	break;	995	break;
970	}	996	}
971	else	997	else
972	{	998	{
…		…
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),	1016	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,	1017	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);	1018	p->prot_major, p->prot_minor);
993		1019
994	if (::conf.script_node_up)	1020	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);	1021	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
		1022	slog (L_WARN, _("node-up command execution failed, continuing."));
996		1023
997	break;	1024	break;
998	}	1025	}
999	else	1026	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1027	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
…		…
1021	{	1048	{
1022	vpndata_packet p = (vpndata_packet )pkt;	1049	vpndata_packet p = (vpndata_packet )pkt;
1023		1050
1024	if (!p->hmac_chk (ictx))	1051	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1052	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1053	"could be an attack, or just corruption or a synchronization error"),
1027	conf->nodename, (const char *)rsi);	1054	conf->nodename, (const char *)rsi);
1028	else	1055	else
1029	{	1056	{
1030	u32 seqno;	1057	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1058	tap_packet *d = p->unpack (this, seqno);
…		…
1034	{	1061	{
1035	vpn->tap->send (d);	1062	vpn->tap->send (d);
1036		1063
1037	if (si != rsi)	1064	if (si != rsi)
1038	{	1065	{
1039	// fast re-sync on connection changes, useful especially for tcp/ip	1066	// fast re-sync on source address changes, useful especially for tcp/ip
1040	si = rsi;	1067	si = rsi;
1041		1068
1042	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),
1043	conf->nodename, (const char )si, (const char )rsi);	1070	conf->nodename, (const char )si, (const char )rsi);
1044	}	1071	}
1045
1046	delete d;
1047
1048	break;
1049	}	1072	}
		1073
		1074	delete d;
		1075	break;
1050	}	1076	}
1051	}	1077	}
1052		1078
1053	send_reset (rsi);	1079	send_reset (rsi);
1054	break;	1080	break;
…		…
1056	case vpn_packet::PT_CONNECT_REQ:	1082	case vpn_packet::PT_CONNECT_REQ:
1057	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1083	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1058	{	1084	{
1059	connect_req_packet p = (connect_req_packet ) pkt;	1085	connect_req_packet p = (connect_req_packet ) pkt;
1060		1086
1061	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1087	if (p->id > 0 && p->id <= vpn->conns.size ())
1062	connection *c = vpn->conns[p->id - 1];
1063	conf->protocols = p->protocols;
1064
1065	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1066	conf->id, p->id, c->ictx && c->octx);
1067
1068	if (c->ictx && c->octx)
1069	{	1088	{
		1089	connection *c = vpn->conns[p->id - 1];
		1090	conf->protocols = p->protocols;
		1091
		1092	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",
		1093	conf->id, p->id, c->ictx && c->octx);
		1094
		1095	if (c->ictx && c->octx)
		1096	{
1070	// send connect_info packets to both sides, in case one is	1097	// send connect_info packets to both sides, in case one is
1071	// behind a nat firewall (or both ;)	1098	// behind a nat firewall (or both ;)
1072	c->send_connect_info (conf->id, si, conf->protocols);	1099	c->send_connect_info (conf->id, si, conf->protocols);
1073	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1100	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1101	}
		1102	else
		1103	c->establish_connection ();
1074	}	1104	}
1075	else	1105	else
1076	c->establish_connection ();	1106	slog (L_WARN,
		1107	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1108	p->id);
1077	}	1109	}
1078		1110
1079	break;	1111	break;
1080		1112
1081	case vpn_packet::PT_CONNECT_INFO:	1113	case vpn_packet::PT_CONNECT_INFO:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1114	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1115	{
1084	connect_info_packet p = (connect_info_packet ) pkt;	1116	connect_info_packet p = (connect_info_packet )pkt;
1085		1117
1086	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1118	if (p->id > 0 && p->id <= vpn->conns.size ())
1087		1119	{
1088	connection *c = vpn->conns[p->id - 1];	1120	connection *c = vpn->conns[p->id - 1];
1089		1121
1090	c->conf->protocols = p->protocols;	1122	c->conf->protocols = p->protocols;
1091	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1123	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1092	p->si.upgrade_protocol (protocol, c->conf);	1124	p->si.upgrade_protocol (protocol, c->conf);
1093		1125
1094	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1126	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1095	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1127	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1096		1128
1097	const sockinfo &dsi = forward_si (p->si);	1129	const sockinfo &dsi = forward_si (p->si);
1098		1130
1099	if (dsi.valid ())	1131	if (dsi.valid ())
1100	c->send_auth_request (dsi, true);	1132	c->send_auth_request (dsi, true);
		1133	}
		1134	else
		1135	slog (L_WARN,
		1136	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1137	p->id);
1101	}	1138	}
1102		1139
1103	break;	1140	break;
1104		1141
1105	default:	1142	default:
…		…
1114	{	1151	{
1115	reset_connection ();	1152	reset_connection ();
1116	establish_connection ();	1153	establish_connection ();
1117	}	1154	}
1118	else if (NOW < last_activity + ::conf.keepalive)	1155	else if (NOW < last_activity + ::conf.keepalive)
1119	w.at = last_activity + ::conf.keepalive;	1156	w.start (last_activity + ::conf.keepalive);
1120	else if (conf->connectmode != conf_node::C_ONDEMAND	1157	else if (conf->connectmode != conf_node::C_ONDEMAND
1121	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1158	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1122	{	1159	{
1123	send_ping (si);	1160	send_ping (si);
1124	w.at = NOW + 5;	1161	w.start (NOW + 5);
1125	}	1162	}
1126	else if (NOW < last_activity + ::conf.keepalive + 10)	1163	else if (NOW < last_activity + ::conf.keepalive + 10)
1127	// hold ondemand connections implicitly a few seconds longer	1164	// hold ondemand connections implicitly a few seconds longer
1128	// should delete octx, though, or something like that ;)	1165	// should delete octx, though, or something like that ;)
1129	w.at = last_activity + ::conf.keepalive + 10;	1166	w.start (last_activity + ::conf.keepalive + 10);
1130	else	1167	else
1131	reset_connection ();	1168	reset_connection ();
1132	}	1169	}
1133		1170
1134	void connection::send_connect_request (int id)	1171	void connection::send_connect_request (int id)
…		…
1140	send_vpn_packet (p, si);	1177	send_vpn_packet (p, si);
1141		1178
1142	delete p;	1179	delete p;
1143	}	1180	}
1144		1181
		1182	void connection::script_init_env (const char *ext)
		1183	{
		1184	char *env;
		1185	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1186	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1187	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1188	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1189	conf->id & 0xff); putenv (env);
		1190	}
		1191
1145	void connection::script_node ()	1192	void connection::script_init_connect_env ()
1146	{	1193	{
1147	vpn->script_if_up ();	1194	vpn->script_init_env ();
1148		1195
1149	char *env;	1196	char *env;
1150	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1151	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1152	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1153	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1154	}	1201	}
1155		1202
1156	const char *connection::script_node_up ()	1203	const char *connection::script_node_up ()
1157	{	1204	{
1158	script_node ();	1205	script_init_connect_env ();
1159		1206
1160	putenv ("STATE=up");	1207	putenv ("STATE=up");
1161		1208
		1209	char *filename;
		1210	asprintf (&filename,
		1211	"%s/%s",
		1212	confbase,
1162	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1213	::conf.script_node_up ? ::conf.script_node_up : "node-up");
		1214
		1215	return filename;
1163	}	1216	}
1164		1217
1165	const char *connection::script_node_down ()	1218	const char *connection::script_node_down ()
1166	{	1219	{
1167	script_node ();	1220	script_init_connect_env ();
1168		1221
1169	putenv ("STATE=down");	1222	putenv ("STATE=down");
1170		1223
1171	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1224	char *filename;
1172	}	1225	asprintf (&filename,
		1226	"%s/%s",
		1227	confbase,
		1228	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1173		1229
		1230	return filename;
		1231	}
		1232
1174	connection::connection(struct vpn *vpn_)	1233	connection::connection (struct vpn vpn, conf_node conf)
1175	: vpn(vpn_)	1234	: vpn(vpn), conf(conf)
1176	, rekey (this, &connection::rekey_cb)	1235	, rekey (this, &connection::rekey_cb)
1177	, keepalive (this, &connection::keepalive_cb)	1236	, keepalive (this, &connection::keepalive_cb)
1178	, establish_connection (this, &connection::establish_connection_cb)	1237	, establish_connection (this, &connection::establish_connection_cb)
		1238	#if ENABLE_DNS
		1239	, dns (0)
		1240	#endif
1179	{	1241	{
1180	octx = ictx = 0;	1242	octx = ictx = 0;
1181	retry_cnt = 0;	1243	retry_cnt = 0;
1182		1244
		1245	if (!conf->protocols) // make sure some protocol is enabled
		1246	conf->protocols = PROT_UDPv4;
		1247
1183	connectmode = conf_node::C_ALWAYS; // initial setting	1248	connectmode = conf_node::C_ALWAYS; // initial setting
1184	reset_connection ();	1249	reset_connection ();
1185	}	1250	}
1186		1251
1187	connection::~connection ()	1252	connection::~connection ()

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Comparing gvpe/src/connection.C (file contents): Revision 1.24 by pcg, Wed Oct 22 01:05:23 2003 UTC vs. Revision 1.58 by pcg, Sat Jul 9 02:35:42 2005 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.24 by pcg, Wed Oct 22 01:05:23 2003 UTC vs.
Revision 1.58 by pcg, Sat Jul 9 02:35:42 2005 UTC