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

Comparing gvpe/src/connection.C (file contents):
Revision 1.12 by pcg, Sun Apr 13 16:53:36 2003 UTC vs.
Revision 1.109 by root, Fri Oct 11 07:56:07 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 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
		38	#include <openssl/opensslv.h>
27	#include <openssl/rand.h>	39	#include <openssl/rand.h>
28	#include <openssl/evp.h>	40	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
30	#include <openssl/err.h>	42	#include <openssl/err.h>
31		43
32	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
33		50
34	#include "conf.h"	51	#include "conf.h"
35	#include "slog.h"	52	#include "slog.h"
36	#include "device.h"	53	#include "device.h"
37	#include "vpn.h"	54	#include "vpn.h"
38	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
39		57
40	#if !HAVE_RAND_PSEUDO_BYTES	58	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		59
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		62
		63	#define ULTRA_FAST 1
		64	#define HLOG 15
		65	#include "lzf/lzf.h"
		66	#include "lzf/lzf_c.c"
		67	#include "lzf/lzf_d.c"
		68
		69	//////////////////////////////////////////////////////////////////////////////
		70
		71	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		72	static ev::child rs_child_ev;
		73
		74	namespace
		75	{
		76	void // c++ requires external linkage here, apparently :(
		77	rs_child_cb (ev::child &w, int revents)
		78	{
		79	w.stop ();
		80
		81	if (rs_queue.empty ())
		82	return;
		83
		84	pid_t pid = run_script (*rs_queue.front ().first, false);
		85	if (pid)
		86	{
		87	w.set (pid);
		88	w.start ();
		89	}
		90	else
		91	slog (L_WARN, rs_queue.front ().second);
		92
		93	delete rs_queue.front ().first;
		94	rs_queue.pop ();
		95	}
		96	};
		97
		98	// despite the fancy name, this is quite a hack
		99	static void
		100	run_script_queued (run_script_cb cb, const char warnmsg)
		101	{
		102	rs_queue.push (std::make_pair (cb, warnmsg));
		103
		104	if (!rs_child_ev.is_active ())
		105	{
		106	rs_child_ev.set<rs_child_cb> ();
		107	rs_child_ev ();
		108	}
		109	}
		110
		111	//////////////////////////////////////////////////////////////////////////////
45		112
46	struct crypto_ctx	113	struct crypto_ctx
47	{	114	{
48	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	116	HMAC_CTX hctx;
50		117
51	crypto_ctx (const rsachallenge &challenge, int enc);	118	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	119	~crypto_ctx ();
53	};	120	};
54		121
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	122	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	123	{
		124	ecdh_key s;
		125
		126	curve25519_combine (a, b, s);
		127
		128	{
		129	u8 mac_key[MAC_KEYSIZE];
		130	static const unsigned char mac_info[] = "gvpe mac key";
		131
		132	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		133	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		134	kdf.extract (s, sizeof (s));
		135	kdf.extract_done (HKDF_PRF_HASH ());
		136	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		137
		138	HMAC_CTX_init (&hctx);
		139	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		140	}
		141
		142	{
		143	u8 cipher_key[CIPHER_KEYSIZE];
		144	static const unsigned char cipher_info[] = "gvpe cipher key";
		145
		146	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		147	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		148	kdf.extract (s, sizeof (s));
		149	kdf.extract_done (HKDF_PRF_HASH ());
		150	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		151
57	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	154	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	155	}
62		156
63	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
64	{	158	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
67	}	161	}
68		162
		163	static inline void
		164	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		165	{
		166	if (RSA_public_encrypt (sizeof (auth.rsa),
		167	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		168	key, RSA_PKCS1_OAEP_PADDING) < 0)
		169	fatal ("RSA_public_encrypt error");
		170
		171	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		172	}
		173
		174	static inline bool
		175	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		176	{
		177	u8 rsa_decrypt[RSA_KEYLEN];
		178
		179	if (RSA_private_decrypt (sizeof (encr.rsa),
		180	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		181	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		182	return 0;
		183
		184	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		185	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		186
		187	return 1;
		188	}
		189
69	static void	190	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
71	{	192	{
72	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
73		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
77	EVP_DigestUpdate(&ctx, &id, sizeof id);
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);
80	}	197	}
81		198
82	struct rsa_entry {	199	void
83	tstamp expire;	200	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	201	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	203	{
		204	// request data
		205	rand_fill (snd_auth.rsa);
		206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		207
132	} rsa_cache;	208	// eventual response data
133		209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	210	}
140	w.at = NOW + RSA_TTL;
141		211
142	for (iterator i = begin (); i != end (); )	212	// every use prolongs the expiry
143	if (i->expire <= NOW)	213	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	214	}
149		215
150	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
151		217
152	void pkt_queue::put (net_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
153	{	220	{
154	if (queue[i])	221	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		222
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	net_packet *pkt_queue::get ()
166	{
167	net_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;	223	i = 0;
182	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	227	}
184		228
185	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
186	{	230	{
187	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
188	delete queue[i];	234	delete [] queue;
189	}	235	}
190		236
		237	void
		238	pkt_queue::expire_cb (ev::timer &w, int revents)
		239	{
		240	ev_tstamp expire = ev_now () - max_ttl;
		241
		242	for (;;)
		243	{
		244	if (empty ())
		245	break;
		246
		247	double diff = queue[j].tstamp - expire;
		248
		249	if (diff >= 0.)
		250	{
		251	w.start (diff > 0.5 ? diff : 0.5);
		252	break;
		253	}
		254
		255	delete get ();
		256	}
		257	}
		258
		259	void
		260	pkt_queue::put (net_packet *p)
		261	{
		262	ev_tstamp now = ev_now ();
		263
		264	// start expiry timer
		265	if (empty ())
		266	expire.start (max_ttl);
		267
		268	int ni = i + 1 == max_queue ? 0 : i + 1;
		269
		270	if (ni == j)
		271	delete get ();
		272
		273	queue[i].pkt = p;
		274	queue[i].tstamp = now;
		275
		276	i = ni;
		277	}
		278
		279	net_packet *
		280	pkt_queue::get ()
		281	{
		282	if (empty ())
		283	return 0;
		284
		285	net_packet *p = queue[j].pkt;
		286	queue[j].pkt = 0;
		287
		288	j = j + 1 == max_queue ? 0 : j + 1;
		289
		290	return p;
		291	}
		292
191	struct net_rateinfo {	293	struct net_rateinfo
		294	{
192	u32 host;	295	u32 host;
193	double pcnt, diff;	296	double pcnt, diff;
194	tstamp last;	297	tstamp last;
195	};	298	};
196		299
197	// only do action once every x seconds per host whole allowing bursts.	300	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	301	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	302	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	303	struct net_rate_limiter : list<net_rateinfo>
201	{	304	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	305	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	306	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	307	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	308	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		309
207	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	311	bool can (u32 host);
209	};	312	};
210		313
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		315
		316	bool
213	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
214	{	318	{
215	iterator i;	319	iterator i;
216		320
217	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
218	if (i->host == host)	322	if (i->host == host)
219	break;	323	break;
220	else if (i->last < NOW - EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	325	i = erase (i);
222	else	326	else
223	i++;	327	i++;
224		328
225	if (i == end ())	329	if (i == end ())
226	{	330	{
227	net_rateinfo ri;	331	net_rateinfo ri;
228		332
229	ri.host = host;	333	ri.host = host;
230	ri.pcnt = 1.;	334	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	335	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	336	ri.last = ev_now ();
233		337
234	push_front (ri);	338	push_front (ri);
235		339
236	return true;	340	return true;
237	}	341	}
238	else	342	else
239	{	343	{
240	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
241	erase (i);	345	erase (i);
242		346
243	ri.pcnt = ri.pcnt * ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		349
246	ri.last = NOW;	350	ri.last = ev_now ();
247		351
248	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
249		353
250	bool send = dif > CUTOFF;	354	bool send = dif > NRL_CUTOFF;
251		355
252	if (dif > MAXDIF)	356	if (dif > NRL_MAXDIF)
253	{	357	{
254	ri.pcnt = 1.;	358	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	359	ri.diff = NRL_MAXDIF;
256	}	360	}
257	else if (send)	361	else if (send)
258	ri.pcnt++;	362	ri.pcnt++;
259		363
260	push_front (ri);	364	push_front (ri);
263	}	367	}
264	}	368	}
265		369
266	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
267		371
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
269
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
271	{	374	{
272	unsigned int xlen;
273
274	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
275		376
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
278	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
280	}	380	}
281		381
282	void	382	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	384	{
285	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		386	hmac_gen (ctx, hmac_digest);
287	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
288	}	388	}
289		389
290	bool	390	bool
291	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
292	{	392	{
293	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
294		394	hmac_gen (ctx, hmac_digest);
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	396	}
297		397
		398	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	400	{
300	type = type_;	401	type = type_;
301		402
302	int src = THISNODE->id;	403	int src = THISNODE->id;
303		404
…		…
307	}	408	}
308		409
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		412
312	struct vpndata_packet:vpn_packet	413	struct vpndata_packet : vpn_packet
		414	{
		415	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		416
		417	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		418	tap_packet unpack (connection conn, u32 &seqno);
		419
		420	private:
		421	const u32 data_hdr_size () const
313	{	422	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315
316	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
317	tap_packet unpack (connection conn, u32 &seqno);
318	private:
319
320	const u32 data_hdr_size () const
321	{
322	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	424	}
		425	};
325		426
326	void	427	void
327	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	428	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
328	{	429	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	431	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
332		433
333	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
335	u32 cl;
336		436
		437	if (conn->features & FEATURE_COMPRESSION)
		438	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		440
338	if (cl)	441	if (cl)
339	{	442	{
340	type = PT_DATA_COMPRESSED;	443	type = PT_DATA_COMPRESSED;
341	d = cdata;	444	d = cdata;
342	l = cl + 2;	445	l = cl + 2;
343		446
344	d[0] = cl >> 8;	447	d[0] = cl >> 8;
345	d[1] = cl;	448	d[1] = cl;
		449	}
346	}	450	}
347	#endif	451	#endif
348		452
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		454
351	struct {	455	struct {
352	#if RAND_SIZE	456	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
354	#endif	458	#endif
355	u32 seqno;	459	u32 seqno;
356	} datahdr;	460	} datahdr;
357		461
358	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	463	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	464	// NB: a constant (per session) random prefix
		465	// is likely enough, but we don't take any chances.
		466	conn->oiv.get (datahdr.rnd, RAND_SIZE);
361	#endif	467	#endif
362		468
363	EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	471	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	472	outl += outl2;
367		473
368	EVP_EncryptUpdate (cctx,	474	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	475	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	476	(unsigned char *) d, l));
371	outl += outl2;	477	outl += outl2;
372		478
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	479	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	480	outl += outl2;
375		481
376	len = outl + data_hdr_size ();	482	len = outl + data_hdr_size ();
377		483
378	set_hdr (type, dst);	484	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	493	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
389	u8 *d;	495	u8 *d;
390	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
391		497
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		499
394	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
396		502
397	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	504	d = cdata;
399	else	505	else
400	#endif	506	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
402		508
403	/* this overwrites part of the src mac, but we fix that later */	509	// we play do evil games with the struct layout atm.
		510	// pending better solutions, we at least do some verification.
		511	// this is fine, as we left ISO territory long ago.
		512	require (DATAHDR <= 16);
		513	require ((u8 )(&p->len + 1) == &(p)[0]);
		514
		515	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	517	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	518	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	519	outl += outl2;
408		520
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	521	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	522	outl += outl2;
411		523
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	524	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		525
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	551	}
440	};	552	};
441		553
442	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
443	{	555	{
444	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	558	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
450		560
451	const u8 curflags () const	561	void setup (ptype type, int dst);
		562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		563
		564	static u8 get_features ()
452	{	565	{
		566	u8 f = 0;
		567	#if ENABLE_COMPRESSION
		568	f \|= FEATURE_COMPRESSION;
		569	#endif
		570	#if ENABLE_ROHC
		571	f \|= FEATURE_ROHC;
		572	#endif
		573	#if ENABLE_BRIDGING
		574	f \|= FEATURE_BRIDGING;
		575	#endif
453	return 0x80	576	return f;
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	577	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	578	};
460		579
		580	void
461	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
462	{	582	{
463	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	586	flags = 0;
467	flags = curflags ();	587	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	592	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		593	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
473		594
474	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	596	set_hdr (type, dst);
476	}	597	}
477		598
478	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	601	{
480	return prot_major == PROTOCOL_MAJOR	602	if (prot_major != PROTOCOL_MAJOR)
481	&& randsize == RAND_SIZE	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
482	&& hmaclen == HMACLENGTH	604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
483	&& flags == curflags ()	605	else if (randsize != RAND_SIZE)
484	&& challengelen == sizeof (rsachallenge)	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
485	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
486	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
487	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
488	}	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		612	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		613	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		614	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		615	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		616	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
489		620
		621	if (cmp > 0)
		622	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		623	conf->nodename, (const char *)rsi);
		624	else if (cmp == 0)
		625	return true;
		626	}
		627
		628	return false;
		629	}
		630
490	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
491	{	632	{
492	char magic[8];	633	char magic[8];
493	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
494	u8 protocols; // supported protocols (will get patches on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
495	u8 pad2, pad3;	636	u8 pad2, pad3;
496	rsaid id;	637	auth_encr encr;
497	rsaencrdata encr;
498		638
499	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
500	{	640	{
501	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
502	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
503	initiate = !!initiate_;	643	initiate = !!initiate_;
504	protocols = protocols_;	644	protocols = protocols_;
505		645
506	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
507	}	647	}
508	};	648	};
509		649
510	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
511	{	651	{
512	rsaid id;
513	u8 pad1, pad2, pad3;
514	u8 response_len; // encrypted length
515	rsaresponse response;	652	auth_response response;
516		653
517	auth_res_packet (int dst)	654	auth_res_packet (int dst)
518	{	655	{
519	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
520		657
521	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
522	}	659	}
523	};	660	};
524		661
…		…
554	};	691	};
555		692
556	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
557		694
558	void	695	void
559	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
560	{	697	{
561	if (ictx && octx)	698	if (!have_snd_auth \|\| !have_rcv_auth)
		699	return;
		700
		701	si = rsi;
		702	protocol = rsi.prot;
		703
		704	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		705	conf->nodename, (const char *)rsi,
		706	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		707	PROTOCOL_MAJOR, prot_minor);
		708
		709	if (::conf.script_node_up)
		710	{
		711	run_script_cb *cb = new run_script_cb;
		712	cb->set<connection, &connection::script_node_up> (this);
		713	run_script_queued (cb, _("node-up command execution failed, continuing."));
562	{	714	}
563	connectmode = conf->connectmode;	715
		716	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		717	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
564		718
565	rekey.start (NOW + ::conf.rekey);	719	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		720	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		721
		722	oiv.reset ();
		723
		724	// make sure rekeying timeouts are slightly asymmetric
		725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		726	rekey.start (rekey_interval, rekey_interval);
		727
		728	hmac_error = 0.;
		729
566	keepalive.start (NOW + ::conf.keepalive);	730	keepalive.start (::conf.keepalive);
567		731
568	// send queued packets	732	// send queued packets
569	if (ictx && octx)
570	{
571	while (tap_packet p = (tap_packet )data_queue.get ())	733	while (tap_packet p = (tap_packet )data_queue.get ())
572	{	734	{
573	send_data_packet (p);	735	if (p->len) send_data_packet (p);
574	delete p;	736	delete p;
575	}	737	}
576		738
577	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	739	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
578	{	740	{
579	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
580	delete p;	742	delete p;
581	}
582	}
583	}	743	}
		744
		745	vpn->connection_established (this);
		746	}
		747
		748	void
		749	connection::reset_si ()
		750	{
		751	if (vpn->can_direct (THISNODE, conf))
		752	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
584	else	753	else
585	{	754	{
586	retry_cnt = 0;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
587	establish_connection.start (NOW + 5);	756	protocol = 0;
588	keepalive.reset ();
589	rekey.reset ();
590	}	757	}
591	}
592
593	void
594	connection::reset_si ()
595	{
596	protocol = best_protocol (THISNODE->protocols & conf->protocols);
597
598	// mask out protocols we cannot establish
599	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
600	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
601		758
602	si.set (conf, protocol);	759	si.set (conf, protocol);
603	}	760	}
604		761
605	// ensure sockinfo is valid, forward if necessary	762	// ensure sockinfo is valid, forward if necessary
606	const sockinfo &	763	const sockinfo &
607	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
608	{	765	{
609	if (!si.valid ())	766	if (!si.valid ())
610	{	767	{
611	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
612		769
613	if (r)	770	if (r)
614	{	771	{
615	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
616	conf->nodename, r->conf->nodename);	773	conf->nodename, r->conf->nodename);
617	return r->si;	774	return r->si;
618	}	775	}
619	else	776	else
620	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
621	conf->nodename);	778	conf->nodename);
622	}	779	}
623		780
624	return si;	781	return si;
625	}	782	}
626		783
627	void	784	void
628	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	785	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
629	{	786	{
630	if (!vpn->send_vpn_packet (pkt, si, tos))	787	if (!vpn->send_vpn_packet (pkt, si, tos))
631	reset_connection ();	788	reset_connection ("packet send error");
632	}	789	}
633		790
634	void	791	void
635	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
636	{	793	{
637	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
638		795
639	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	796	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		797
		798	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
640	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
641		800
642	delete pkt;	801	delete pkt;
643	}	802	}
644		803
…		…
659	void	818	void
660	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
661	{	820	{
662	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	821	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
663		822
664	rsachallenge chg;	823	generate_auth_data ();
		824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
665		825
666	rsa_cache.gen (pkt->id, chg);
667
668	if (0 > RSA_public_encrypt (sizeof chg,
669	(unsigned char )&chg, (unsigned char )&pkt->encr,
670	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
671	fatal ("RSA_public_encrypt error");
672
673	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
674
675	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
676		828
677	delete pkt;	829	delete pkt;
678	}	830	}
679		831
680	void	832	void
681	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
682	{	834	{
683	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
684		836
685	pkt->id = id;	837	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		838	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
686		839
687	rsa_hash (id, chg, pkt->response);
688
689	pkt->hmac_set (octx);
690
691	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	840	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
692
693	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	841	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
694		842
695	delete pkt;	843	delete pkt;
696	}	844	}
697		845
698	void	846	void
699	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
700	{	848	{
701	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
702	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
703		852
704	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	853	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
705		854
706	r->hmac_set (octx);	855	r->hmac_set (octx);
707	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
708		857
709	delete r;	858	delete r;
710	}	859	}
711		860
712	void	861	inline void
713	connection::establish_connection_cb (time_watcher &w)	862	connection::establish_connection_cb (ev::timer &w, int revents)
714	{	863	{
715	if (ictx \|\| conf == THISNODE	864	if (!(ictx && octx)
		865	&& conf != THISNODE
716	\|\| connectmode == conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
717	\|\| connectmode == conf_node::C_DISABLED)	867	&& connectmode != conf_node::C_DISABLED
718	w.at = TSTAMP_CANCEL;	868	&& !w.is_active ())
719	else if (w.at <= NOW)
720	{	869	{
721	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
722		871	// and stop trying. should probably be handled by a per-connection expire handler.
723	if (retry_int < 3600 * 8)	872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
724	retry_cnt++;	875	return;
		876	}
725		877
726	w.at = NOW + retry_int;	878	last_establish_attempt = ev_now ();
		879
		880	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		881	? (retry_cnt & 3) + 1
		882	: 1 << (retry_cnt >> 2));
727		883
728	reset_si ();	884	reset_si ();
729		885
730	if (si.prot && !si.host)	886	bool slow = (si.prot & PROT_SLOW) \|\| (conf->low_power \|\| THISNODE->low_power);
		887
		888	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		889	{
		890	/TODO/ /* start the timer so we don't recurse endlessly */
		891	w.start (1);
731	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
		893	}
732	else	894	else
733	{	895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
734	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
		901
		902	slow = slow \|\| (dsi.prot & PROT_SLOW);
735		903
736	if (dsi.valid () && auth_rate_limiter.can (dsi))	904	if (dsi.valid () && auth_rate_limiter.can (dsi))
737	{	905	{
738	if (retry_cnt < 4)	906	// use ping after the first few retries
		907	// TODO: on rekeys, the other node might not interpret ping correctly,
		908	// TODO: as it will still have a valid connection
		909	if (retry_cnt < 4 && (!conf->low_power \|\| THISNODE->low_power))
739	send_auth_request (dsi, true);	910	send_auth_request (dsi, true);
740	else	911	else
741	send_ping (dsi, 0);	912	send_ping (dsi, 0);
742	}	913	}
743	}	914	}
744	}
745	}
746		915
		916	retry_int *= slow ? 4. : 0.9;
		917
		918	if (retry_int < conf->max_retry)
		919	retry_cnt++;
		920	else
		921	retry_int = conf->max_retry;
		922
		923	w.start (retry_int);
		924	}
		925	}
		926
747	void	927	void
748	connection::reset_connection ()	928	connection::reset_connection (const char *reason)
749	{	929	{
750	if (ictx && octx)	930	if (ictx && octx)
751	{	931	{
752	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost (%s)"),
753	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si, reason);
754		934
755	if (::conf.script_node_down)	935	if (::conf.script_node_down)
756	run_script (run_script_cb (this, &connection::script_node_down), false);	936	{
		937	run_script_cb *cb = new run_script_cb;
		938	cb->set<connection, &connection::script_node_down> (this);
		939	run_script_queued (cb, _("node-down command execution failed, continuing."));
		940	}
757	}	941	}
758		942
759	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
760	delete octx; octx = 0;	944	delete octx; octx = 0;
761		945
762	si.host= 0;	946	si.host = 0;
763		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
764	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
765	retry_cnt = 0;	954	retry_cnt = 0;
766		955
767	rekey.reset ();	956	rekey.stop ();
768	keepalive.reset ();	957	keepalive.stop ();
769	establish_connection.reset ();	958	establish_connection.stop ();
770	}	959	}
771		960
772	void	961	void
773	connection::shutdown ()	962	connection::shutdown ()
774	{	963	{
775	if (ictx && octx)	964	if (ictx && octx)
776	send_reset (si);	965	send_reset (si);
777		966
778	reset_connection ();	967	reset_connection ("shutdown");
779	}	968	}
780		969
781	void	970	// poor-man's rekeying
782	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
783	{	973	{
784	w.at = TSTAMP_CANCEL;
785
786	reset_connection ();	974	reset_connection ("rekeying");
787	establish_connection ();	975	establish_connection ();
788	}	976	}
789		977
790	void	978	void
791	connection::send_data_packet (tap_packet *pkt, bool broadcast)	979	connection::send_data_packet (tap_packet *pkt)
792	{	980	{
793	vpndata_packet *p = new vpndata_packet;	981	vpndata_packet *p = new vpndata_packet;
794	int tos = 0;	982	int tos = 0;
795		983
796	// I am not hilarious about peeking into packets, but so be it.	984	// I am not hilarious about peeking into packets, but so be it.
797	if (conf->inherit_tos	985	if (conf->inherit_tos && pkt->is_ipv4 ())
798	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
799	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
800	tos = (*pkt)[15] & IPTOS_TOS_MASK;	986	tos = (*pkt)[15] & IPTOS_TOS_MASK;
801		987
802	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	988	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
803	send_vpn_packet (p, si, tos);	989	send_vpn_packet (p, si, tos);
804		990
805	delete p;	991	delete p;
806		992
807	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
808	rekey ();	994	rekey ();
809	}	995	}
810		996
811	void	997	void
		998	connection::post_inject_queue ()
		999	{
		1000	// force a connection every now and when when packets are sent (max 1/s)
		1001	if (ev_now () - last_establish_attempt >= (conf->low_power \|\| THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1002	establish_connection.stop ();
		1003
		1004	establish_connection ();
		1005	}
		1006
		1007	void
812	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1008	connection::inject_data_packet (tap_packet *pkt)
813	{	1009	{
814	if (ictx && octx)	1010	if (ictx && octx)
815	send_data_packet (pkt, broadcast);	1011	send_data_packet (pkt);
816	else	1012	else
817	{	1013	{
818	if (!broadcast)//DDDD
819	data_queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
820		1015	post_inject_queue ();
821	establish_connection ();
822	}	1016	}
823	}	1017	}
824		1018
		1019	void
825	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
826	{	1021	{
827	if (ictx && octx)	1022	if (ictx && octx)
828	send_vpn_packet (pkt, si, tos);	1023	send_vpn_packet (pkt, si, tos);
829	else	1024	else
830	{	1025	{
831	vpn_queue.put (new vpn_packet (*pkt));	1026	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
832		1027	post_inject_queue ();
833	establish_connection ();
834	}	1028	}
835	}	1029	}
836		1030
837	void	1031	void
838	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
839	{	1033	{
840	last_activity = NOW;	1034	last_activity = ev_now ();
841		1035
842	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1036	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
843	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1037	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1038
		1039	if (connectmode == conf_node::C_DISABLED)
		1040	return;
844		1041
845	switch (pkt->typ ())	1042	switch (pkt->typ ())
846	{	1043	{
847	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
848	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
849	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
850	// when we receive a ping.	1049	// when we receive a ping.
851	if (!ictx)	1050	if (!ictx)
852	{	1051	{
853	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
854	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
855	}	1054	}
856	else	1055	else
		1056	// we would love to change the socket address here, but ping's aren't
		1057	// authenticated, so we best ignore it.
857	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
858		1059
859	break;	1060	break;
860		1061
861	case vpn_packet::PT_PONG:	1062	case vpn_packet::PT_PONG:
		1063	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1064
		1065	// a PONG might mean that the other side doesn't really know
		1066	// about our desire for communication.
		1067	establish_connection ();
862	break;	1068	break;
863		1069
864	case vpn_packet::PT_RESET:	1070	case vpn_packet::PT_RESET:
		1071	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1072
		1073	if (ictx && octx)
865	{	1074	{
866	reset_connection ();	1075	reset_connection ("remote reset");
867		1076
868	config_packet p = (config_packet ) pkt;	1077	config_packet p = (config_packet ) pkt;
869		1078
870	if (!p->chk_config ())	1079	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
871	{
872	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
873	conf->nodename, (const char *)rsi);
874	connectmode = conf_node::C_DISABLED;
875	}
876	else if (connectmode == conf_node::C_ALWAYS)
877	establish_connection ();	1080	establish_connection ();
878	}	1081	}
		1082
879	break;	1083	break;
880		1084
881	case vpn_packet::PT_AUTH_REQ:	1085	case vpn_packet::PT_AUTH_REQ:
882	if (auth_rate_limiter.can (rsi))	1086	if (auth_rate_limiter.can (rsi))
883	{	1087	{
884	auth_req_packet p = (auth_req_packet ) pkt;	1088	auth_req_packet p = (auth_req_packet )pkt;
885		1089
886	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1090	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1091	conf->nodename, p->initiate ? "initiate" : "reply",
		1092	p->protocols, p->features);
887		1093
888	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1094	if (memcmp (p->magic, MAGIC, 8))
		1095	{
		1096	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1097	conf->nodename, (const char *)rsi);
		1098	}
		1099	else if (p->chk_config (conf, rsi))
889	{	1100	{
890	if (p->prot_minor != PROTOCOL_MINOR)	1101	if (p->prot_minor != PROTOCOL_MINOR)
891	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1102	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
892	conf->nodename, (const char *)rsi,	1103	conf->nodename, (const char *)rsi,
893	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1104	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
894		1105
895	if (p->initiate)	1106	if (p->initiate)
		1107	{
896	send_auth_request (rsi, false);	1108	send_auth_request (rsi, false);
897		1109
898	rsachallenge k;	1110	if (ictx && octx)
		1111	reset_connection ("reconnect");
		1112	}
899		1113
900	if (0 > RSA_private_decrypt (sizeof (p->encr),	1114	auth_data auth;
901	(unsigned char )&p->encr, (unsigned char )&k,	1115
902	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1116	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1117	{
903	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1118	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
904	conf->nodename, (const char *)rsi);	1119	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1120	}
905	else	1121	else
906	{	1122	{
907	delete octx;	1123	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
908		1124
909	octx = new crypto_ctx (k, 1);	1125	rcv_auth = auth;
910	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1126	have_rcv_auth = true;
911		1127
		1128	send_auth_response (rsi);
		1129
		1130	if (chg)
		1131	{
912	conf->protocols = p->protocols;	1132	conf->protocols = p->protocols;
		1133	features = p->features & config_packet::get_features ();
913		1134
914	send_auth_response (rsi, p->id, k);
915
916	connection_established ();	1135	connection_established (rsi);
917
918	break;	1136	}
919	}	1137	}
		1138
		1139	break;
920	}	1140	}
921		1141
922	send_reset (rsi);	1142	send_reset (rsi);
923	}	1143	}
924		1144
925	break;	1145	break;
926		1146
927	case vpn_packet::PT_AUTH_RES:	1147	case vpn_packet::PT_AUTH_RES:
928	{	1148	{
929	auth_res_packet p = (auth_res_packet ) pkt;	1149	auth_res_packet p = (auth_res_packet )pkt;
930		1150
931	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1151	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
932		1152
933	if (p->chk_config ())	1153	auth_mac local_mac;
		1154	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1155
		1156	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
934	{	1157	{
935	if (p->prot_minor != PROTOCOL_MINOR)
936	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
937	conf->nodename, (const char *)rsi,
938	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
939
940	rsachallenge chg;
941
942	if (!rsa_cache.find (p->id, chg))
943	slog (L_ERR, _("%s(%s): unrequested auth response"),	1158	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
944	conf->nodename, (const char *)rsi);	1159	conf->nodename, (const char *)rsi);
945	else
946	{
947	crypto_ctx *cctx = new crypto_ctx (chg, 0);
948
949	if (!p->hmac_chk (cctx))
950	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
951	"could be an attack, or just corruption or an synchronization error"),
952	conf->nodename, (const char *)rsi);
953	else
954	{
955	rsaresponse h;
956
957	rsa_hash (p->id, chg, h);
958
959	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
960	{
961	prot_minor = p->prot_minor;
962
963	delete ictx; ictx = cctx;
964
965	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
966
967	si = rsi;
968	protocol = rsi.prot;
969
970	connection_established ();
971
972	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
973	conf->nodename, (const char *)rsi,
974	p->prot_major, p->prot_minor);
975
976	if (::conf.script_node_up)
977	run_script (run_script_cb (this, &connection::script_node_up), false);
978
979	break;
980	}
981	else
982	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
983	conf->nodename, (const char *)rsi);
984	}
985
986	delete cctx;
987	}	1160	}
		1161	else if (!have_snd_auth)
		1162	{
		1163	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1164
		1165	have_snd_auth = true;
		1166	connection_established (rsi);
988	}	1167	}
989	}	1168	}
990
991	send_reset (rsi);
992	break;	1169	break;
993		1170
994	case vpn_packet::PT_DATA_COMPRESSED:	1171	case vpn_packet::PT_DATA_COMPRESSED:
995	#if !ENABLE_COMPRESSION	1172	#if !ENABLE_COMPRESSION
996	send_reset (rsi);	1173	send_reset (rsi);
…		…
1002	if (ictx && octx)	1179	if (ictx && octx)
1003	{	1180	{
1004	vpndata_packet p = (vpndata_packet )pkt;	1181	vpndata_packet p = (vpndata_packet )pkt;
1005		1182
1006	if (!p->hmac_chk (ictx))	1183	if (!p->hmac_chk (ictx))
		1184	{
		1185	// rekeying often creates temporary hmac auth floods
		1186	// we assume they don't take longer than a few seconds normally,
		1187	// and suppress messages and resets during that time.
		1188	//TODO: should be done per source address
		1189	if (!hmac_error)
		1190	{
		1191	hmac_error = ev_now () + 3;
		1192	break;
		1193	}
		1194	else if (hmac_error >= ev_now ())
		1195	break; // silently suppress
		1196	else
		1197	{
1007	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1198	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1008	"could be an attack, or just corruption or an synchronization error"),	1199	"could be an attack, or just corruption or a synchronization error."),
1009	conf->nodename, (const char *)rsi);	1200	conf->nodename, (const char *)rsi);
		1201	// reset
		1202	}
		1203	}
1010	else	1204	else
1011	{	1205	{
1012	u32 seqno;	1206	u32 seqno;
1013	tap_packet *d = p->unpack (this, seqno);	1207	tap_packet *d = p->unpack (this, seqno);
		1208	int seqclass = iseqno.seqno_classify (seqno);
1014		1209
1015	if (iseqno.recv_ok (seqno))	1210	hmac_error = 0;
		1211
		1212	if (seqclass == 0) // ok
1016	{	1213	{
1017	vpn->tap->send (d);	1214	vpn->tap->send (d);
1018		1215
1019	if (p->dst () == 0) // re-broadcast
1020	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1021	{
1022	connection c = i;
1023
1024	if (c->conf != THISNODE && c->conf != conf)
1025	c->inject_data_packet (d);
1026	}
1027
1028	if (si != rsi)	1216	if (si != rsi)
1029	{	1217	{
1030	// fast re-sync on conneciton changes, useful especially for tcp/ip	1218	// fast re-sync on source address changes, useful especially for tcp/ip
		1219	//if (last_si_change < ev_now () + 5.)
1031	si = rsi;	1220	// {
1032
1033	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1221	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1034	conf->nodename, (const char )si, (const char )rsi);	1222	conf->nodename, (const char )si, (const char )rsi);
		1223
		1224	si = rsi;
		1225
		1226	if (::conf.script_node_change)
		1227	{
		1228	run_script_cb *cb = new run_script_cb;
		1229	cb->set<connection, &connection::script_node_change> (this);
		1230	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1231	}
		1232
		1233	// }
		1234	//else
		1235	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1236	// conf->nodename, (const char )si, (const char )rsi);
1035	}	1237	}
1036
1037	delete d;
1038
1039	break;
1040	}	1238	}
		1239	else if (seqclass == 1) // far history
		1240	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1241	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1242	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1243	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1244	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1245	else if (seqclass == 3) // reset
		1246	{
		1247	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1248	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1249	send_reset (rsi);
		1250	}
		1251
		1252	delete d;
		1253	break;
1041	}	1254	}
1042	}	1255	}
1043		1256
1044	send_reset (rsi);	1257	send_reset (rsi);
1045	break;	1258	break;
1046		1259
1047	case vpn_packet::PT_CONNECT_REQ:	1260	case vpn_packet::PT_CONNECT_REQ:
1048	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1261	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1049	{	1262	{
1050	connect_req_packet p = (connect_req_packet ) pkt;	1263	connect_req_packet p = (connect_req_packet )pkt;
1051		1264
1052	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1265	if (p->id > 0 && p->id <= vpn->conns.size ())
1053	connection *c = vpn->conns[p->id - 1];
1054	conf->protocols = p->protocols;
1055
1056	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1057	conf->id, p->id, c->ictx && c->octx);
1058
1059	if (c->ictx && c->octx)
1060	{	1266	{
		1267	connection *c = vpn->conns[p->id - 1];
		1268	conf->protocols = p->protocols;
		1269
		1270	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1271	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1272	p->protocols,
		1273	c->ictx && c->octx);
		1274
		1275	if (c->ictx && c->octx)
		1276	{
1061	// send connect_info packets to both sides, in case one is	1277	// send connect_info packets to both sides, in case one is
1062	// behind a nat firewall (or both ;)	1278	// behind a nat firewall (or both ;)
1063	c->send_connect_info (conf->id, si, conf->protocols);	1279	c->send_connect_info (conf->id, si, conf->protocols);
1064	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1280	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1281	}
		1282	else
		1283	c->establish_connection ();
1065	}	1284	}
1066	else	1285	else
1067	c->establish_connection ();	1286	slog (L_WARN,
		1287	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1288	p->id);
1068	}	1289	}
1069		1290
1070	break;	1291	break;
1071		1292
1072	case vpn_packet::PT_CONNECT_INFO:	1293	case vpn_packet::PT_CONNECT_INFO:
1073	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1294	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1074	{	1295	{
1075	connect_info_packet p = (connect_info_packet ) pkt;	1296	connect_info_packet p = (connect_info_packet )pkt;
1076		1297
1077	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1298	if (p->id > 0 && p->id <= vpn->conns.size ())
1078		1299	{
1079	connection *c = vpn->conns[p->id - 1];	1300	connection *c = vpn->conns[p->id - 1];
1080		1301
1081	c->conf->protocols = p->protocols;	1302	c->conf->protocols = p->protocols;
1082	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1303	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1083	p->si.upgrade_protocol (protocol, c->conf);	1304	p->si.upgrade_protocol (protocol, c->conf);
1084		1305
1085	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1306	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1086	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1307	conf->nodename,
		1308	vpn->conns[p->id - 1]->conf->nodename,
		1309	(const char *)p->si,
		1310	p->protocols,
		1311	protocol,
		1312	p->si.supported_protocols (c->conf),
		1313	!c->ictx && !c->octx);
1087		1314
1088	const sockinfo &dsi = forward_si (p->si);	1315	const sockinfo &dsi = forward_si (p->si);
1089		1316
1090	if (dsi.valid ())	1317	if (dsi.valid ())
1091	c->send_auth_request (dsi, true);	1318	c->send_auth_request (dsi, true);
		1319	else
		1320	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1321	vpn->conns[p->id - 1]->conf->nodename,
		1322	(const char *)p->si);
		1323	}
		1324	else
		1325	slog (L_WARN,
		1326	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1327	p->id);
1092	}	1328	}
1093		1329
1094	break;	1330	break;
1095		1331
1096	default:	1332	default:
1097	send_reset (rsi);	1333	send_reset (rsi);
1098	break;	1334	break;
1099	}	1335	}
1100	}	1336	}
1101		1337
1102	void connection::keepalive_cb (time_watcher &w)	1338	inline void
		1339	connection::keepalive_cb (ev::timer &w, int revents)
1103	{	1340	{
1104	if (NOW >= last_activity + ::conf.keepalive + 30)	1341	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1342
		1343	if (when >= 0)
		1344	w.start (when);
		1345	else if (when < -15)
1105	{	1346	{
1106	reset_connection ();	1347	reset_connection ("keepalive overdue");
1107	establish_connection ();	1348	establish_connection ();
1108	}	1349	}
1109	else if (NOW < last_activity + ::conf.keepalive)
1110	w.at = last_activity + ::conf.keepalive;
1111	else if (conf->connectmode != conf_node::C_ONDEMAND	1350	else if (conf->connectmode != conf_node::C_ONDEMAND
1112	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1351	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1113	{	1352	{
		1353	w.start (3);
1114	send_ping (si);	1354	send_ping (si);
1115	w.at = NOW + 5;
1116	}	1355	}
1117	else if (NOW < last_activity + ::conf.keepalive + 10)	1356	else if (when >= -10)
1118	// hold ondemand connections implicitly a few seconds longer	1357	// hold ondemand connections implicitly a few seconds longer
1119	// should delete octx, though, or something like that ;)	1358	// should delete octx, though, or something like that ;)
1120	w.at = last_activity + ::conf.keepalive + 10;	1359	w.start (when + 10);
1121	else	1360	else
1122	reset_connection ();	1361	reset_connection ("keepalive timeout");
1123	}	1362	}
1124		1363
		1364	void
1125	void connection::send_connect_request (int id)	1365	connection::send_connect_request (int id)
1126	{	1366	{
1127	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1367	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1128		1368
1129	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1369	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1370	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1371	THISNODE->protocols);
1130	p->hmac_set (octx);	1372	p->hmac_set (octx);
1131	send_vpn_packet (p, si);	1373	send_vpn_packet (p, si);
1132		1374
1133	delete p;	1375	delete p;
1134	}	1376	}
1135		1377
1136	void connection::script_node ()	1378	void
		1379	connection::script_init_env (const char *ext)
1137	{	1380	{
1138	vpn->script_if_up ();
1139
1140	char *env;	1381	char *env;
		1382	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1383	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1384	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1385	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1386	conf->id & 0xff); putenv (env);
		1387	}
		1388
		1389	void
		1390	connection::script_init_connect_env ()
		1391	{
		1392	vpn->script_init_env ();
		1393
		1394	char *env;
1141	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1395	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1396	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1142	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1397	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1143	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1398	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1144	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1399	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1145	}	1400	}
1146		1401
		1402	inline const char *
1147	const char *connection::script_node_up ()	1403	connection::script_node_up ()
1148	{	1404	{
1149	script_node ();	1405	script_init_connect_env ();
1150		1406
1151	putenv ("STATE=up");	1407	putenv ((char *)"STATE=up");
1152		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
1153	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1413	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1154	}
1155		1414
		1415	return filename;
		1416	}
		1417
		1418	inline const char *
		1419	connection::script_node_change ()
		1420	{
		1421	script_init_connect_env ();
		1422
		1423	putenv ((char *)"STATE=change");
		1424
		1425	char *filename;
		1426	asprintf (&filename,
		1427	"%s/%s",
		1428	confbase,
		1429	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1430
		1431	return filename;
		1432	}
		1433
		1434	inline const char *
1156	const char *connection::script_node_down ()	1435	connection::script_node_down ()
1157	{	1436	{
1158	script_node ();	1437	script_init_connect_env ();
1159		1438
1160	putenv ("STATE=down");	1439	putenv ((char *)"STATE=down");
1161		1440
1162	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1441	char *filename;
1163	}	1442	asprintf (&filename,
		1443	"%s/%s",
		1444	confbase,
		1445	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1164		1446
		1447	return filename;
		1448	}
		1449
1165	connection::connection(struct vpn *vpn_)	1450	connection::connection (struct vpn vpn, conf_node conf)
1166	: vpn(vpn_)	1451	: vpn(vpn), conf(conf),
1167	, rekey (this, &connection::rekey_cb)	1452	#if ENABLE_DNS
1168	, keepalive (this, &connection::keepalive_cb)	1453	dns (0),
		1454	#endif
		1455	data_queue(conf->max_ttl, conf->max_queue + 1),
		1456	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1457	{
		1458	rekey .set<connection, &connection::rekey_cb > (this);
		1459	keepalive .set<connection, &connection::keepalive_cb > (this);
1169	, establish_connection (this, &connection::establish_connection_cb)	1460	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1170	{	1461
		1462	last_establish_attempt = 0.;
1171	octx = ictx = 0;	1463	octx = ictx = 0;
1172	retry_cnt = 0;
1173		1464
1174	connectmode = conf_node::C_ALWAYS; // initial setting	1465	connectmode = conf->connectmode;
		1466
		1467	// queue a dummy packet to force an initial connection attempt
		1468	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1469	vpn_queue.put (new net_packet);
		1470
1175	reset_connection ();	1471	reset_connection ("startup");
1176	}	1472	}
1177		1473
1178	connection::~connection ()	1474	connection::~connection ()
1179	{	1475	{
1180	shutdown ();	1476	shutdown ();
1181	}	1477	}
1182		1478
		1479	void
1183	void connection_init ()	1480	connection_init ()
1184	{	1481	{
1185	auth_rate_limiter.clear ();	1482	auth_rate_limiter.clear ();
1186	reset_rate_limiter.clear ();	1483	reset_rate_limiter.clear ();
1187	}	1484	}
1188		1485

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Comparing gvpe/src/connection.C (file contents): Revision 1.12 by pcg, Sun Apr 13 16:53:36 2003 UTC vs. Revision 1.109 by root, Fri Oct 11 07:56:07 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.12 by pcg, Sun Apr 13 16:53:36 2003 UTC vs.
Revision 1.109 by root, Fri Oct 11 07:56:07 2013 UTC