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

Comparing gvpe/src/connection.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.67 by pcg, Thu Aug 7 16:34:21 2008 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2005 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
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your 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,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but 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
12	GNU General Public License for more details.	15	GNU General 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
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	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
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24		23
25	#include <list>	24	#include <list>
26		25
27	#include <openssl/rand.h>	26	#include <openssl/rand.h>
28	#include <openssl/evp.h>	27	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	28	#include <openssl/rsa.h>
30	#include <openssl/err.h>	29	#include <openssl/err.h>
31
32	#include "gettext.h"
33		30
34	#include "conf.h"	31	#include "conf.h"
35	#include "slog.h"	32	#include "slog.h"
36	#include "device.h"	33	#include "device.h"
37	#include "vpn.h"	34	#include "vpn.h"
38	#include "connection.h"	35	#include "connection.h"
39		36
		37	#include "netcompat.h"
		38
40	#if !HAVE_RAND_PSEUDO_BYTES	39	#if !HAVE_RAND_PSEUDO_BYTES
41	# define RAND_pseudo_bytes RAND_bytes	40	# define RAND_pseudo_bytes RAND_bytes
42	#endif	41	#endif
43		42
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
45		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
46	struct crypto_ctx	51	struct crypto_ctx
47	{	52	{
48	EVP_CIPHER_CTX cctx;	53	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	54	HMAC_CTX hctx;
50		55
53	};	58	};
54		59
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
56	{	61	{
57	EVP_CIPHER_CTX_init (&cctx);	62	EVP_CIPHER_CTX_init (&cctx);
58	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));
59	HMAC_CTX_init (&hctx);	64	HMAC_CTX_init (&hctx);
60	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);
61	}	66	}
62		67
63	crypto_ctx::~crypto_ctx ()	68	crypto_ctx::~crypto_ctx ()
64	{	69	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	70	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	71	HMAC_CTX_cleanup (&hctx);
67	}	72	}
68		73
69	static void	74	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
71	{	76	{
72	EVP_MD_CTX ctx;	77	EVP_MD_CTX ctx;
73		78
74	EVP_MD_CTX_init (&ctx);	79	EVP_MD_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	80	require (EVP_DigestInit (&ctx, RSA_HASH));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
79	EVP_MD_CTX_cleanup (&ctx);	84	EVP_MD_CTX_cleanup (&ctx);
80	}	85	}
81		86
82	struct rsa_entry {	87	struct rsa_entry
		88	{
83	tstamp expire;	89	tstamp expire;
84	rsaid id;	90	rsaid id;
85	rsachallenge chg;	91	rsachallenge chg;
86	};	92	};
87		93
88	struct rsa_cache : list<rsa_entry>	94	struct rsa_cache : list<rsa_entry>
89	{	95	{
90	void cleaner_cb (tstamp &ts); time_watcher cleaner;	96	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
91		97
92	bool find (const rsaid &id, rsachallenge &chg)	98	bool find (const rsaid &id, rsachallenge &chg)
93	{	99	{
94	for (iterator i = begin (); i != end (); ++i)	100	for (iterator i = begin (); i != end (); ++i)
95	{	101	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())
97	{	103	{
98	memcpy (&chg, &i->chg, sizeof chg);	104	memcpy (&chg, &i->chg, sizeof chg);
99		105
100	erase (i);	106	erase (i);
101	return true;	107	return true;
102	}	108	}
103	}	109	}
104		110
105	if (cleaner.at < NOW)	111	if (!cleaner.is_active ())
106	cleaner.start (NOW + RSA_TTL);	112	cleaner.again ();
107		113
108	return false;	114	return false;
109	}	115	}
110		116
111	void gen (rsaid &id, rsachallenge &chg)	117	void gen (rsaid &id, rsachallenge &chg)
112	{	118	{
113	rsa_entry e;	119	rsa_entry e;
114		120
115	RAND_bytes ((unsigned char *)&id, sizeof id);	121	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);	122	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117		123
118	e.expire = NOW + RSA_TTL;	124	e.expire = ev_now () + RSA_TTL;
119	e.id = id;	125	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);	126	memcpy (&e.chg, &chg, sizeof chg);
121		127
122	push_back (e);	128	push_back (e);
123		129
124	if (cleaner.at < NOW)	130	if (!cleaner.is_active ())
125	cleaner.start (NOW + RSA_TTL);	131	cleaner.again ();
126	}	132	}
127		133
128	rsa_cache ()	134	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)	135	{
130	{ }	136	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
		137	cleaner.set (RSA_TTL, RSA_TTL);
		138	}
131		139
132	} rsa_cache;	140	} rsa_cache;
133		141
134	void rsa_cache::cleaner_cb (tstamp &ts)	142	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
135	{	143	{
136	if (empty ())	144	if (empty ())
137	ts = TSTAMP_CANCEL;	145	w.stop ();
138	else	146	else
139	{	147	{
140	ts = NOW + RSA_TTL;
141
142	for (iterator i = begin (); i != end (); )	148	for (iterator i = begin (); i != end (); )
143	if (i->expire <= NOW)	149	if (i->expire <= ev_now ())
144	i = erase (i);	150	i = erase (i);
145	else	151	else
146	++i;	152	++i;
147	}	153	}
148	}	154	}
149		155
150	//////////////////////////////////////////////////////////////////////////////	156	//////////////////////////////////////////////////////////////////////////////
151		157
152	void pkt_queue::put (tap_packet *p)	158	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		159	: max_ttl (max_ttl), max_queue (max_queue)
153	{	160	{
154	if (queue[i])	161	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		162
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;	163	i = 0;
182	j = 0;	164	j = 0;
		165
		166	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	167	}
184		168
185	pkt_queue::~pkt_queue ()	169	pkt_queue::~pkt_queue ()
186	{	170	{
187	for (i = QUEUEDEPTH; --i > 0; )	171	while (net_packet *p = get ())
		172	delete p;
		173
188	delete queue[i];	174	delete [] queue;
189	}	175	}
190		176
		177	void pkt_queue::expire_cb (ev::timer &w, int revents)
		178	{
		179	ev_tstamp expire = ev_now () - max_ttl;
		180
		181	for (;;)
		182	{
		183	if (empty ())
		184	break;
		185
		186	double diff = queue[j].tstamp - expire;
		187
		188	if (diff >= 0.)
		189	{
		190	w.start (diff > 0.5 ? diff : 0.5);
		191	break;
		192	}
		193
		194	delete get ();
		195	}
		196	}
		197
		198	void pkt_queue::put (net_packet *p)
		199	{
		200	ev_tstamp now = ev_now ();
		201
		202	// start expiry timer
		203	if (empty ())
		204	expire.start (max_ttl);
		205
		206	int ni = i + 1 == max_queue ? 0 : i + 1;
		207
		208	if (ni == j)
		209	delete get ();
		210
		211	queue[i].pkt = p;
		212	queue[i].tstamp = now;
		213
		214	i = ni;
		215	}
		216
		217	net_packet *pkt_queue::get ()
		218	{
		219	if (empty ())
		220	return 0;
		221
		222	net_packet *p = queue[j].pkt;
		223	queue[j].pkt = 0;
		224
		225	j = j + 1 == max_queue ? 0 : j + 1;
		226
		227	return p;
		228	}
		229
191	struct net_rateinfo {	230	struct net_rateinfo
		231	{
192	u32 host;	232	u32 host;
193	double pcnt, diff;	233	double pcnt, diff;
194	tstamp last;	234	tstamp last;
195	};	235	};
196		236
197	// only do action once every x seconds per host whole allowing bursts.	237	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	238	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	239	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	240	struct net_rate_limiter : list<net_rateinfo>
201	{	241	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	242	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	243	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	244	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		245	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		246
206	bool can (const sockinfo &si) { return can((u32)si.host); }	247	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	248	bool can (u32 host);
208	};	249	};
209		250
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	251	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		252
…		…
214	iterator i;	255	iterator i;
215		256
216	for (i = begin (); i != end (); )	257	for (i = begin (); i != end (); )
217	if (i->host == host)	258	if (i->host == host)
218	break;	259	break;
219	else if (i->last < NOW - EXPIRE)	260	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	261	i = erase (i);
221	else	262	else
222	i++;	263	i++;
223		264
224	if (i == end ())	265	if (i == end ())
225	{	266	{
226	net_rateinfo ri;	267	net_rateinfo ri;
227		268
228	ri.host = host;	269	ri.host = host;
229	ri.pcnt = 1.;	270	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	271	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	272	ri.last = ev_now ();
232		273
233	push_front (ri);	274	push_front (ri);
234		275
235	return true;	276	return true;
236	}	277	}
237	else	278	else
238	{	279	{
239	net_rateinfo ri (*i);	280	net_rateinfo ri (*i);
240	erase (i);	281	erase (i);
241		282
242	ri.pcnt = ri.pcnt * ALPHA;	283	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	284	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		285
245	ri.last = NOW;	286	ri.last = ev_now ();
246		287
		288	double dif = ri.diff / ri.pcnt;
		289
247	bool send = ri.diff / ri.pcnt > CUTOFF;	290	bool send = dif > NRL_CUTOFF;
248		291
		292	if (dif > NRL_MAXDIF)
		293	{
		294	ri.pcnt = 1.;
		295	ri.diff = NRL_MAXDIF;
		296	}
249	if (send)	297	else if (send)
250	ri.pcnt++;	298	ri.pcnt++;
251		299
252	push_front (ri);	300	push_front (ri);
253		301
254	return send;	302	return send;
…		…
285	hmac_gen (ctx);	333	hmac_gen (ctx);
286		334
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	335	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	336	}
289		337
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	338	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	339	{
292	this->type = type;	340	type = type_;
293		341
294	int src = THISNODE->id;	342	int src = THISNODE->id;
295		343
296	src1 = src;	344	src1 = src;
297	srcdst = ((src >> 8) << 4) \| (dst >> 8);	345	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
299	}	347	}
300		348
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	349	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	350	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		351
304	struct vpndata_packet:vpn_packet	352	struct vpndata_packet : vpn_packet
305	{	353	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno	354	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307		355
308	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	356	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
309	tap_packet unpack (connection conn, u32 &seqno);	357	tap_packet unpack (connection conn, u32 &seqno);
…		…
322	int outl = 0, outl2;	370	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	371	ptype type = PT_DATA_UNCOMPRESSED;
324		372
325	#if ENABLE_COMPRESSION	373	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	374	u8 cdata[MAX_MTU];
327	u32 cl;
328		375
		376	if (conn->features & ENABLE_COMPRESSION)
		377	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	378	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		379
330	if (cl)	380	if (cl)
331	{	381	{
332	type = PT_DATA_COMPRESSED;	382	type = PT_DATA_COMPRESSED;
333	d = cdata;	383	d = cdata;
334	l = cl + 2;	384	l = cl + 2;
335		385
336	d[0] = cl >> 8;	386	d[0] = cl >> 8;
337	d[1] = cl;	387	d[1] = cl;
		388	}
338	}	389	}
339	#endif	390	#endif
340		391
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	392	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
342		393
343	struct {	394	struct {
344	#if RAND_SIZE	395	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	396	u8 rnd[RAND_SIZE];
346	#endif	397	#endif
…		…
350	datahdr.seqno = ntohl (seqno);	401	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	402	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	403	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
353	#endif	404	#endif
354		405
355	EVP_EncryptUpdate (cctx,	406	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	407	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	408	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	409	outl += outl2;
359		410
360	EVP_EncryptUpdate (cctx,	411	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	412	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	413	(unsigned char *) d, l));
363	outl += outl2;	414	outl += outl2;
364		415
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	416	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	417	outl += outl2;
367		418
368	len = outl + data_hdr_size ();	419	len = outl + data_hdr_size ();
369		420
370	set_hdr (type, dst);	421	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	430	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	431	tap_packet *p = new tap_packet;
381	u8 *d;	432	u8 *d;
382	u32 l = len - data_hdr_size ();	433	u32 l = len - data_hdr_size ();
383		434
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	435	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
385		436
386	#if ENABLE_COMPRESSION	437	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	438	u8 cdata[MAX_MTU];
388		439
389	if (type == PT_DATA_COMPRESSED)	440	if (type == PT_DATA_COMPRESSED)
…		…
391	else	442	else
392	#endif	443	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	444	d = &(*p)[6 + 6 - DATAHDR];
394		445
395	/* this overwrites part of the src mac, but we fix that later */	446	/* this overwrites part of the src mac, but we fix that later */
396	EVP_DecryptUpdate (cctx,	447	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	448	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	449	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	450	outl += outl2;
400		451
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	452	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	453	outl += outl2;
403		454
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	455	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		456
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	457	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
435	{	486	{
436	// actually, hmaclen cannot be checked because the hmac	487	// actually, hmaclen cannot be checked because the hmac
437	// field comes before this data, so peers with other	488	// field comes before this data, so peers with other
438	// hmacs simply will not work.	489	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	490	u8 prot_major, prot_minor, randsize, hmaclen;
440	u8 flags, challengelen, pad2, pad3;	491	u8 flags, challengelen, features, pad3;
441	u32 cipher_nid, digest_nid, hmac_nid;	492	u32 cipher_nid, digest_nid, hmac_nid;
442
443	const u8 curflags () const
444	{
445	return 0x80
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}
448		493
449	void setup (ptype type, int dst);	494	void setup (ptype type, int dst);
450	bool chk_config () const;	495	bool chk_config () const;
		496
		497	static u8 get_features ()
		498	{
		499	u8 f = 0;
		500	#if ENABLE_COMPRESSION
		501	f \|= FEATURE_COMPRESSION;
		502	#endif
		503	#if ENABLE_ROHC
		504	f \|= FEATURE_ROHC;
		505	#endif
		506	#if ENABLE_BRIDGING
		507	f \|= FEATURE_BRIDGING;
		508	#endif
		509	return f;
		510	}
451	};	511	};
452		512
453	void config_packet::setup (ptype type, int dst)	513	void config_packet::setup (ptype type, int dst)
454	{	514	{
455	prot_major = PROTOCOL_MAJOR;	515	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	516	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	517	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	518	hmaclen = HMACLENGTH;
459	flags = curflags ();	519	flags = 0;
460	challengelen = sizeof (rsachallenge);	520	challengelen = sizeof (rsachallenge);
		521	features = get_features ();
461		522
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	523	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));	524	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	525	hmac_nid = htonl (EVP_MD_type (DIGEST));
465		526
…		…
467	set_hdr (type, dst);	528	set_hdr (type, dst);
468	}	529	}
469		530
470	bool config_packet::chk_config () const	531	bool config_packet::chk_config () const
471	{	532	{
472	return prot_major == PROTOCOL_MAJOR	533	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	534	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	535	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	536	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
		537	else if (hmaclen != HMACLENGTH)
		538	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
476	&& challengelen == sizeof (rsachallenge)	539	else if (challengelen != sizeof (rsachallenge))
		540	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	541	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		542	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))	543	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		544	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));	545	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		546	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		547	else
		548	return true;
		549
		550	return false;
480	}	551	}
481		552
482	struct auth_req_packet : config_packet	553	struct auth_req_packet : config_packet
483	{	554	{
484	char magic[8];	555	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	556	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	557	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	558	u8 pad2, pad3;
488	rsaid id;	559	rsaid id;
489	rsaencrdata encr;	560	rsaencrdata encr;
490		561
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	562	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
546	};	617	};
547		618
548	/////////////////////////////////////////////////////////////////////////////	619	/////////////////////////////////////////////////////////////////////////////
549		620
550	void	621	void
		622	connection::connection_established ()
		623	{
		624	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);
		625
		626	if (ictx && octx)
		627	{
		628	// make sure rekeying timeouts are slightly asymmetric
		629	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		630	rekey.start (rekey_interval, rekey_interval);
		631	keepalive.start (::conf.keepalive);
		632
		633	// send queued packets
		634	if (ictx && octx)
		635	{
		636	while (tap_packet p = (tap_packet )data_queue.get ())
		637	{
		638	if (p->len) send_data_packet (p);
		639	delete p;
		640	}
		641
		642	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		643	{
		644	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		645	delete p;
		646	}
		647	}
		648	}
		649	else
		650	{
		651	retry_cnt = 0;
		652	establish_connection.start (5);
		653	keepalive.stop ();
		654	rekey.stop ();
		655	}
		656	}
		657
		658	void
551	connection::reset_dstaddr ()	659	connection::reset_si ()
552	{	660	{
553	si.set (conf);
554	}
555
556	void
557	connection::send_ping (const sockinfo &si, u8 pong)
558	{
559	ping_packet *pkt = new ping_packet;
560
561	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
562	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563
564	delete pkt;
565	}
566
567	void
568	connection::send_reset (const sockinfo &si)
569	{
570	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
571	{
572	config_packet *pkt = new config_packet;
573
574	pkt->setup (vpn_packet::PT_RESET, conf->id);
575	send_vpn_packet (pkt, si, IPTOS_MINCOST);
576
577	delete pkt;
578	}
579	}
580
581	void
582	connection::send_auth_request (const sockinfo &si, bool initiate)
583	{
584	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
585
586	protocol = best_protocol (THISNODE->protocols & conf->protocols);	661	protocol = best_protocol (THISNODE->protocols & conf->protocols);
587		662
588	// mask out protocols we cannot establish	663	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	664	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	665	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		666	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
591		667
592	if (protocol)	668	if (protocol
		669	&& (!conf->can_direct (THISNODE)
		670	\|\| !THISNODE->can_direct (conf)))
		671	{
		672	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);
		673	protocol = 0;
593	{	674	}
594	rsachallenge chg;
595		675
596	rsa_cache.gen (pkt->id, chg);	676	si.set (conf, protocol);
		677	}
597		678
598	if (0 > RSA_public_encrypt (sizeof chg,	679	// ensure sockinfo is valid, forward if necessary
599	(unsigned char )&chg, (unsigned char )&pkt->encr,	680	const sockinfo &
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	681	connection::forward_si (const sockinfo &si) const
601	fatal ("RSA_public_encrypt error");	682	{
		683	if (!si.valid ())
		684	{
		685	connection *r = vpn->find_router ();
602		686
603	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	687	if (r)
		688	{
		689	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
		690	conf->nodename, r->conf->nodename, (const char *)r->si);
		691	return r->si;
		692	}
		693	else
		694	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
		695	conf->nodename);
		696	}
604		697
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	698	return si;
		699	}
		700
		701	void
		702	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		703	{
		704	if (!vpn->send_vpn_packet (pkt, si, tos))
		705	reset_connection ();
		706	}
		707
		708	void
		709	connection::send_ping (const sockinfo &si, u8 pong)
		710	{
		711	ping_packet *pkt = new ping_packet;
		712
		713	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		714	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		715
		716	delete pkt;
		717	}
		718
		719	void
		720	connection::send_reset (const sockinfo &si)
		721	{
		722	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		723	{
		724	config_packet *pkt = new config_packet;
		725
		726	pkt->setup (vpn_packet::PT_RESET, conf->id);
		727	send_vpn_packet (pkt, si, IPTOS_MINCOST);
606		728
607	delete pkt;	729	delete pkt;
608	}	730	}
609	else	731	}
610	; // silently fail	732
		733	void
		734	connection::send_auth_request (const sockinfo &si, bool initiate)
		735	{
		736	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		737
		738	rsachallenge chg;
		739	rsa_cache.gen (pkt->id, chg);
		740	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
		741
		742	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
		743
		744	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
		745
		746	delete pkt;
611	}	747	}
612		748
613	void	749	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	750	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
615	{	751	{
…		…
629	}	765	}
630		766
631	void	767	void
632	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	768	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
633	{	769	{
634	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	770	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",
635	conf->id, rid, (const char *)rsi);	771	conf->id, rid, (const char *)rsi);
636		772
637	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	773	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
638		774
639	r->hmac_set (octx);	775	r->hmac_set (octx);
640	send_vpn_packet (r, si);	776	send_vpn_packet (r, si);
641		777
642	delete r;	778	delete r;
643	}	779	}
644		780
645	void	781	inline void
646	connection::establish_connection_cb (tstamp &ts)	782	connection::establish_connection_cb (ev::timer &w, int revents)
647	{	783	{
648	if (ictx \|\| conf == THISNODE	784	if (!ictx
		785	&& conf != THISNODE
649	\|\| connectmode == conf_node::C_NEVER	786	&& connectmode != conf_node::C_NEVER
650	\|\| connectmode == conf_node::C_DISABLED)	787	&& connectmode != conf_node::C_DISABLED
651	ts = TSTAMP_CANCEL;	788	&& !w.is_active ())
652	else if (ts <= NOW)
653	{	789	{
654	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	790	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
655		791	// and stop trying. should probably be handled by a per-connection expire handler.
656	if (retry_int < 3600 * 8)	792	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
657	retry_cnt++;
658
659	ts = NOW + retry_int;
660
661	if (conf->hostname)
662	{	793	{
663	reset_dstaddr ();	794	reset_connection ();
664	if (si.host && auth_rate_limiter.can (si))	795	return;
665	{
666	if (retry_cnt < 4)
667	send_auth_request (si, true);
668	else
669	send_ping (si, 0);
670	}	796	}
		797
		798	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		799	? (retry_cnt & 3) + 1
		800	: 1 << (retry_cnt >> 2));
		801
		802	reset_si ();
		803
		804	bool slow = si.prot & PROT_SLOW;
		805
		806	if (si.prot && !si.host)
		807	{
		808	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
		809	/TODO/ /* start the timer so we don't recurse endlessly */
		810	w.start (1);
		811	vpn->send_connect_request (conf->id);
671	}	812	}
672	else	813	else
673	vpn->connect_request (conf->id);	814	{
		815	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);
		816
		817	const sockinfo &dsi = forward_si (si);
		818
		819	slow = slow \|\| (dsi.prot & PROT_SLOW);
		820
		821	if (dsi.valid () && auth_rate_limiter.can (dsi))
		822	{
		823	if (retry_cnt < 4)
		824	send_auth_request (dsi, true);
		825	else
		826	send_ping (dsi, 0);
		827	}
		828	}
		829
		830	retry_int *= slow ? 8. : 0.7;
		831
		832	if (retry_int < conf->max_retry)
		833	retry_cnt++;
		834	else
		835	retry_int = conf->max_retry;
		836
		837	w.start (retry_int);
674	}	838	}
675	}	839	}
676		840
677	void	841	void
678	connection::reset_connection ()	842	connection::reset_connection ()
…		…
681	{	845	{
682	slog (L_INFO, _("%s(%s): connection lost"),	846	slog (L_INFO, _("%s(%s): connection lost"),
683	conf->nodename, (const char *)si);	847	conf->nodename, (const char *)si);
684		848
685	if (::conf.script_node_down)	849	if (::conf.script_node_down)
686	run_script (run_script_cb (this, &connection::script_node_down), false);	850	{
		851	run_script_cb cb;
		852	cb.set<connection, &connection::script_node_down> (this);
		853	if (!run_script (cb, false))
		854	slog (L_WARN, _("node-down command execution failed, continuing."));
		855	}
687	}	856	}
688		857
689	delete ictx; ictx = 0;	858	delete ictx; ictx = 0;
690	delete octx; octx = 0;	859	delete octx; octx = 0;
		860	#if ENABLE_DNS
		861	dnsv4_reset_connection ();
		862	#endif
691		863
692	si.host= 0;	864	si.host = 0;
693		865
694	last_activity = 0;	866	last_activity = 0;
695	retry_cnt = 0;	867	retry_cnt = 0;
696		868
697	rekey.reset ();	869	rekey.stop ();
698	keepalive.reset ();	870	keepalive.stop ();
699	establish_connection.reset ();	871	establish_connection.stop ();
700	}	872	}
701		873
702	void	874	void
703	connection::shutdown ()	875	connection::shutdown ()
704	{	876	{
…		…
706	send_reset (si);	878	send_reset (si);
707		879
708	reset_connection ();	880	reset_connection ();
709	}	881	}
710		882
711	void	883	inline void
712	connection::rekey_cb (tstamp &ts)	884	connection::rekey_cb (ev::timer &w, int revents)
713	{	885	{
714	ts = TSTAMP_CANCEL;
715
716	reset_connection ();	886	reset_connection ();
717	establish_connection ();	887	establish_connection ();
718	}	888	}
719		889
720	void	890	void
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	891	connection::send_data_packet (tap_packet *pkt)
722	{	892	{
723	vpndata_packet *p = new vpndata_packet;	893	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	894	int tos = 0;
725		895
726	if (conf->inherit_tos	896	// I am not hilarious about peeking into packets, but so be it.
727	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	897	if (conf->inherit_tos && pkt->is_ipv4 ())
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	898	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		899
731	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	900	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
732	send_vpn_packet (p, si, tos);	901	send_vpn_packet (p, si, tos);
733		902
734	delete p;	903	delete p;
735		904
736	if (oseqno > MAX_SEQNO)	905	if (oseqno > MAX_SEQNO)
737	rekey ();	906	rekey ();
738	}	907	}
739		908
740	void	909	void
741	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	910	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
742	{	911	{
743	if (ictx && octx)	912	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	913	send_data_packet (pkt);
745	else	914	else
746	{	915	{
747	if (!broadcast)//DDDD	916	if (!broadcast)
748	queue.put (new tap_packet (*pkt));	917	data_queue.put (new tap_packet (*pkt));
749		918
750	establish_connection ();	919	establish_connection ();
751	}	920	}
752	}	921	}
753		922
		923	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		924	{
		925	if (ictx && octx)
		926	send_vpn_packet (pkt, si, tos);
		927	else
		928	{
		929	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		930
		931	establish_connection ();
		932	}
		933	}
		934
754	void	935	void
755	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	936	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
756	{	937	{
757	last_activity = NOW;	938	last_activity = ev_now ();
758		939
759	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	940	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
760	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	941	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
		942
		943	if (connectmode == conf_node::C_DISABLED)
		944	return;
761		945
762	switch (pkt->typ ())	946	switch (pkt->typ ())
763	{	947	{
764	case vpn_packet::PT_PING:	948	case vpn_packet::PT_PING:
765	// we send pings instead of auth packets after some retries,	949	// we send pings instead of auth packets after some retries,
…		…
812	if (p->initiate)	996	if (p->initiate)
813	send_auth_request (rsi, false);	997	send_auth_request (rsi, false);
814		998
815	rsachallenge k;	999	rsachallenge k;
816		1000
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	1001	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
818	(unsigned char )&p->encr, (unsigned char )&k,	1002	{
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
820	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1003	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
821	conf->nodename, (const char *)rsi);	1004	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1005	break;
		1006	}
822	else	1007	else
823	{	1008	{
824	retry_cnt = 0;
825	establish_connection.set (NOW + 8); //? ;)
826	keepalive.reset ();
827	rekey.reset ();
828
829	delete ictx;
830	ictx = 0;
831
832	delete octx;	1009	delete octx;
833		1010
834	octx = new crypto_ctx (k, 1);	1011	octx = new crypto_ctx (k, 1);
835	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1012	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
836		1013
837	conf->protocols = p->protocols;	1014	conf->protocols = p->protocols;
		1015	features = p->features & config_packet::get_features ();
		1016
838	send_auth_response (rsi, p->id, k);	1017	send_auth_response (rsi, p->id, k);
		1018
		1019	connection_established ();
839		1020
840	break;	1021	break;
841	}	1022	}
842	}	1023	}
		1024	else
		1025	slog (L_WARN, _("%s(%s): protocol mismatch"),
		1026	conf->nodename, (const char *)rsi);
843		1027
844	send_reset (rsi);	1028	send_reset (rsi);
845	}	1029	}
846		1030
847	break;	1031	break;
…		…
860	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1044	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861		1045
862	rsachallenge chg;	1046	rsachallenge chg;
863		1047
864	if (!rsa_cache.find (p->id, chg))	1048	if (!rsa_cache.find (p->id, chg))
		1049	{
865	slog (L_ERR, _("%s(%s): unrequested auth response"),	1050	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
866	conf->nodename, (const char *)rsi);	1051	conf->nodename, (const char *)rsi);
		1052	break;
		1053	}
867	else	1054	else
868	{	1055	{
869	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1056	crypto_ctx *cctx = new crypto_ctx (chg, 0);
870		1057
871	if (!p->hmac_chk (cctx))	1058	if (!p->hmac_chk (cctx))
		1059	{
872	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1060	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
873	"could be an attack, or just corruption or an synchronization error"),	1061	"could be an attack, or just corruption or a synchronization error"),
874	conf->nodename, (const char *)rsi);	1062	conf->nodename, (const char *)rsi);
		1063	break;
		1064	}
875	else	1065	else
876	{	1066	{
877	rsaresponse h;	1067	rsaresponse h;
878		1068
879	rsa_hash (p->id, chg, h);	1069	rsa_hash (p->id, chg, h);
…		…
885	delete ictx; ictx = cctx;	1075	delete ictx; ictx = cctx;
886		1076
887	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid	1077	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888		1078
889	si = rsi;	1079	si = rsi;
		1080	protocol = rsi.prot;
890		1081
891	rekey.set (NOW + ::conf.rekey);	1082	connection_established ();
892	keepalive.set (NOW + ::conf.keepalive);
893		1083
894	// send queued packets	1084	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
895	while (tap_packet *p = queue.get ())	1085	conf->nodename, (const char *)rsi,
		1086	p->prot_major, p->prot_minor);
		1087
		1088	if (::conf.script_node_up)
896	{	1089	{
897	send_data_packet (p);	1090	run_script_cb cb;
898	delete p;	1091	cb.set<connection, &connection::script_node_up> (this);
		1092	if (!run_script (cb, false))
		1093	slog (L_WARN, _("node-up command execution failed, continuing."));
899	}	1094	}
900
901	connectmode = conf->connectmode;
902
903	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
904	conf->nodename, (const char *)rsi,
905	strprotocol (protocol),
906	p->prot_major, p->prot_minor);
907
908	if (::conf.script_node_up)
909	run_script (run_script_cb (this, &connection::script_node_up), false);
910		1095
911	break;	1096	break;
912	}	1097	}
913	else	1098	else
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1099	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
…		…
933		1118
934	if (ictx && octx)	1119	if (ictx && octx)
935	{	1120	{
936	vpndata_packet p = (vpndata_packet )pkt;	1121	vpndata_packet p = (vpndata_packet )pkt;
937		1122
938	if (rsi == si)	1123	if (!p->hmac_chk (ictx))
		1124	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1125	"could be an attack, or just corruption or a synchronization error"),
		1126	conf->nodename, (const char *)rsi);
		1127	else
939	{	1128	{
940	if (!p->hmac_chk (ictx))
941	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
942	"could be an attack, or just corruption or an synchronization error"),
943	conf->nodename, (const char *)rsi);
944	else	1129	u32 seqno;
		1130	tap_packet *d = p->unpack (this, seqno);
		1131
		1132	if (iseqno.recv_ok (seqno))
945	{	1133	{
946	u32 seqno;	1134	vpn->tap->send (d);
947	tap_packet *d = p->unpack (this, seqno);
948		1135
949	if (iseqno.recv_ok (seqno))	1136	if (si != rsi)
950	{	1137	{
951	vpn->tap->send (d);	1138	// fast re-sync on source address changes, useful especially for tcp/ip
952
953	if (p->dst () == 0) // re-broadcast
954	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
955	{
956	connection c = i;
957
958	if (c->conf != THISNODE && c->conf != conf)
959	c->inject_data_packet (d);
960	}
961
962	delete d;
963
964	break;	1139	si = rsi;
		1140
		1141	slog (L_INFO, _("%s(%s): socket address changed to %s"),
		1142	conf->nodename, (const char )si, (const char )rsi);
965	}	1143	}
966	}	1144	}
		1145
		1146	delete d;
		1147	break;
967	}	1148	}
968	else
969	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
970	}	1149	}
971		1150
972	send_reset (rsi);	1151	send_reset (rsi);
973	break;	1152	break;
974		1153
975	case vpn_packet::PT_CONNECT_REQ:	1154	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1155	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1156	{
978	connect_req_packet p = (connect_req_packet ) pkt;	1157	connect_req_packet p = (connect_req_packet ) pkt;
979		1158
980	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1159	if (p->id > 0 && p->id <= vpn->conns.size ())
981	conf->protocols = p->protocols;
982	connection *c = vpn->conns[p->id - 1];
983
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985	conf->id, p->id, c->ictx && c->octx);
986
987	if (c->ictx && c->octx)
988	{	1160	{
		1161	connection *c = vpn->conns[p->id - 1];
		1162	conf->protocols = p->protocols;
		1163
		1164	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",
		1165	conf->id, p->id, c->ictx && c->octx);
		1166
		1167	if (c->ictx && c->octx)
		1168	{
989	// send connect_info packets to both sides, in case one is	1169	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1170	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1171	c->send_connect_info (conf->id, si, conf->protocols);
992	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1172	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1173	}
		1174	else
		1175	c->establish_connection ();
993	}	1176	}
		1177	else
		1178	slog (L_WARN,
		1179	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1180	p->id);
994	}	1181	}
995		1182
996	break;	1183	break;
997		1184
998	case vpn_packet::PT_CONNECT_INFO:	1185	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1186	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1187	{
1001	connect_info_packet p = (connect_info_packet ) pkt;	1188	connect_info_packet p = (connect_info_packet )pkt;
1002		1189
1003	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1190	if (p->id > 0 && p->id <= vpn->conns.size ())
1004	conf->protocols = p->protocols;	1191	{
1005	connection *c = vpn->conns[p->id - 1];	1192	connection *c = vpn->conns[p->id - 1];
1006		1193
		1194	c->conf->protocols = p->protocols;
		1195	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1196	p->si.upgrade_protocol (protocol, c->conf);
		1197
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1198	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1199	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1009		1200
		1201	const sockinfo &dsi = forward_si (p->si);
		1202
		1203	if (dsi.valid ())
1010	c->send_auth_request (p->si, true);	1204	c->send_auth_request (dsi, true);
		1205	}
		1206	else
		1207	slog (L_WARN,
		1208	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1209	p->id);
1011	}	1210	}
1012		1211
1013	break;	1212	break;
1014		1213
1015	default:	1214	default:
1016	send_reset (rsi);	1215	send_reset (rsi);
1017	break;	1216	break;
1018	}	1217	}
1019	}	1218	}
1020		1219
1021	void connection::keepalive_cb (tstamp &ts)	1220	inline void
		1221	connection::keepalive_cb (ev::timer &w, int revents)
1022	{	1222	{
1023	if (NOW >= last_activity + ::conf.keepalive + 30)	1223	if (ev_now () >= last_activity + ::conf.keepalive + 30)
1024	{	1224	{
1025	reset_connection ();	1225	reset_connection ();
1026	establish_connection ();	1226	establish_connection ();
1027	}	1227	}
1028	else if (NOW < last_activity + ::conf.keepalive)	1228	else if (ev_now () < last_activity + ::conf.keepalive)
1029	ts = last_activity + ::conf.keepalive;	1229	w.start (last_activity + ::conf.keepalive - ev::now ());
1030	else if (conf->connectmode != conf_node::C_ONDEMAND	1230	else if (conf->connectmode != conf_node::C_ONDEMAND
1031	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1231	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1032	{	1232	{
1033	send_ping (si);	1233	send_ping (si);
1034	ts = NOW + 5;	1234	w.start (5);
1035	}	1235	}
		1236	else if (ev_now () < last_activity + ::conf.keepalive + 10)
		1237	// hold ondemand connections implicitly a few seconds longer
		1238	// should delete octx, though, or something like that ;)
		1239	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());
1036	else	1240	else
1037	reset_connection ();	1241	reset_connection ();
1038	}	1242	}
1039		1243
1040	void connection::connect_request (int id)	1244	void connection::send_connect_request (int id)
1041	{	1245	{
1042	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1246	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1043		1247
1044	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1248	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1045	p->hmac_set (octx);	1249	p->hmac_set (octx);
1046	send_vpn_packet (p, si);	1250	send_vpn_packet (p, si);
1047		1251
1048	delete p;	1252	delete p;
1049	}	1253	}
1050		1254
		1255	void connection::script_init_env (const char *ext)
		1256	{
		1257	char *env;
		1258	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1259	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1260	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1261	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1262	conf->id & 0xff); putenv (env);
		1263	}
		1264
1051	void connection::script_node ()	1265	void connection::script_init_connect_env ()
1052	{	1266	{
1053	vpn->script_if_up ();	1267	vpn->script_init_env ();
1054		1268
1055	char *env;	1269	char *env;
1056	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1270	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1057	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1271	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1058	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1272	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1059	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1273	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1060	}	1274	}
1061		1275
		1276	inline const char *
1062	const char *connection::script_node_up ()	1277	connection::script_node_up ()
1063	{	1278	{
1064	script_node ();	1279	script_init_connect_env ();
1065		1280
1066	putenv ("STATE=up");	1281	putenv ((char *)"STATE=up");
1067		1282
		1283	char *filename;
		1284	asprintf (&filename,
		1285	"%s/%s",
		1286	confbase,
1068	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1287	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1069	}
1070		1288
		1289	return filename;
		1290	}
		1291
		1292	inline const char *
1071	const char *connection::script_node_down ()	1293	connection::script_node_down ()
1072	{	1294	{
1073	script_node ();	1295	script_init_connect_env ();
1074		1296
1075	putenv ("STATE=down");	1297	putenv ((char *)"STATE=down");
1076		1298
1077	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1299	char *filename;
1078	}	1300	asprintf (&filename,
		1301	"%s/%s",
		1302	confbase,
		1303	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1079		1304
1080	// send a vpn packet out to other hosts	1305	return filename;
1081	void
1082	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1083	{
1084	switch (protocol)
1085	{
1086	case PROT_IPv4:
1087	vpn->send_ipv4_packet (pkt, si, tos);
1088	break;
1089
1090	case PROT_UDPv4:
1091	vpn->send_udpv4_packet (pkt, si, tos);
1092	break;
1093
1094	case PROT_TCPv4:
1095	vpn->send_tcpv4_packet (pkt, si, tos);
1096	break;
1097	}
1098	}	1306	}
1099		1307
1100	connection::connection(struct vpn *vpn_)	1308	connection::connection (struct vpn vpn, conf_node conf)
1101	: vpn(vpn_)	1309	: vpn(vpn), conf(conf),
1102	, rekey (this, &connection::rekey_cb)	1310	#if ENABLE_DNS
1103	, keepalive (this, &connection::keepalive_cb)	1311	dns (0),
		1312	#endif
		1313	data_queue(conf->max_ttl, conf->max_queue),
		1314	vpn_queue(conf->max_ttl, conf->max_queue)
		1315	{
		1316	rekey .set<connection, &connection::rekey_cb > (this);
		1317	keepalive .set<connection, &connection::keepalive_cb > (this);
1104	, establish_connection (this, &connection::establish_connection_cb)	1318	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1105	{	1319
1106	octx = ictx = 0;	1320	octx = ictx = 0;
1107	retry_cnt = 0;	1321	retry_cnt = 0;
1108		1322
1109	connectmode = conf_node::C_ALWAYS; // initial setting	1323	if (!conf->protocols) // make sure some protocol is enabled
		1324	conf->protocols = PROT_UDPv4;
		1325
		1326	connectmode = conf->connectmode;
		1327
		1328	// queue a dummy packet to force an initial connection attempt
		1329	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1330	{
		1331	net_packet *p = new net_packet;
		1332	p->len = 0;
		1333	vpn_queue.put (p);
		1334	}
		1335
1110	reset_connection ();	1336	reset_connection ();
1111	}	1337	}
1112		1338
1113	connection::~connection ()	1339	connection::~connection ()
1114	{	1340	{

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Comparing gvpe/src/connection.C (file contents): Revision 1.3 by pcg, Wed Apr 2 05:15:00 2003 UTC vs. Revision 1.67 by pcg, Thu Aug 7 16:34:21 2008 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.3 by pcg, Wed Apr 2 05:15:00 2003 UTC vs.
Revision 1.67 by pcg, Thu Aug 7 16:34:21 2008 UTC