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

Comparing gvpe/src/connection.C (file contents):
Revision 1.15 by pcg, Fri Aug 8 10:58:28 2003 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 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
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb cb, const char warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
57	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	146	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	147	}
62		148
63	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
64	{	150	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
67	}	153	}
68		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
		180	}
		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	HMAC_CTX ctx;
73		186
74	EVP_MD_CTX_init (&ctx);	187	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	188	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	189	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	190	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	191	HMAC_CTX_cleanup (&ctx);
80	}	192	}
81		193
82	struct rsa_entry {	194	void
83	tstamp expire;	195	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	196	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	197	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	{ }	198	{
		199	// request data
		200	rand_fill (snd_auth.rsa);
		201	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		202	auth_hash (snd_auth, snd_auth_mac);
131		203
132	} rsa_cache;	204	// eventual response data
133		205	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	{	206	}
140	w.at = NOW + RSA_TTL;
141		207
142	for (iterator i = begin (); i != end (); )	208	// every use prolongs the expiry
143	if (i->expire <= NOW)	209	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	210	}
149		211
150	//////////////////////////////////////////////////////////////////////////////	212	//////////////////////////////////////////////////////////////////////////////
151		213
152	void pkt_queue::put (net_packet *p)	214	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		215	: max_ttl (max_ttl), max_queue (max_queue)
153	{	216	{
154	if (queue[i])	217	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		218
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;	219	i = 0;
182	j = 0;	220	j = 0;
		221
		222	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	223	}
184		224
185	pkt_queue::~pkt_queue ()	225	pkt_queue::~pkt_queue ()
186	{	226	{
187	for (i = QUEUEDEPTH; --i > 0; )	227	while (net_packet *p = get ())
		228	delete p;
		229
188	delete queue[i];	230	delete [] queue;
189	}	231	}
190		232
		233	void
		234	pkt_queue::expire_cb (ev::timer &w, int revents)
		235	{
		236	ev_tstamp expire = ev_now () - max_ttl;
		237
		238	for (;;)
		239	{
		240	if (empty ())
		241	break;
		242
		243	double diff = queue[j].tstamp - expire;
		244
		245	if (diff >= 0.)
		246	{
		247	w.start (diff > 0.5 ? diff : 0.5);
		248	break;
		249	}
		250
		251	delete get ();
		252	}
		253	}
		254
		255	void
		256	pkt_queue::put (net_packet *p)
		257	{
		258	ev_tstamp now = ev_now ();
		259
		260	// start expiry timer
		261	if (empty ())
		262	expire.start (max_ttl);
		263
		264	int ni = i + 1 == max_queue ? 0 : i + 1;
		265
		266	if (ni == j)
		267	delete get ();
		268
		269	queue[i].pkt = p;
		270	queue[i].tstamp = now;
		271
		272	i = ni;
		273	}
		274
		275	net_packet *
		276	pkt_queue::get ()
		277	{
		278	if (empty ())
		279	return 0;
		280
		281	net_packet *p = queue[j].pkt;
		282	queue[j].pkt = 0;
		283
		284	j = j + 1 == max_queue ? 0 : j + 1;
		285
		286	return p;
		287	}
		288
191	struct net_rateinfo {	289	struct net_rateinfo
		290	{
192	u32 host;	291	u32 host;
193	double pcnt, diff;	292	double pcnt, diff;
194	tstamp last;	293	tstamp last;
195	};	294	};
196		295
197	// only do action once every x seconds per host whole allowing bursts.	296	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	297	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	298	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	299	struct net_rate_limiter : list<net_rateinfo>
201	{	300	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	301	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	302	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	303	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	304	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		305
207	bool can (const sockinfo &si) { return can((u32)si.host); }	306	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	307	bool can (u32 host);
209	};	308	};
210		309
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	310	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		311
		312	bool
213	bool net_rate_limiter::can (u32 host)	313	net_rate_limiter::can (u32 host)
214	{	314	{
215	iterator i;	315	iterator i;
216		316
217	for (i = begin (); i != end (); )	317	for (i = begin (); i != end (); )
218	if (i->host == host)	318	if (i->host == host)
219	break;	319	break;
220	else if (i->last < NOW - EXPIRE)	320	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	321	i = erase (i);
222	else	322	else
223	i++;	323	i++;
224		324
225	if (i == end ())	325	if (i == end ())
226	{	326	{
227	net_rateinfo ri;	327	net_rateinfo ri;
228		328
229	ri.host = host;	329	ri.host = host;
230	ri.pcnt = 1.;	330	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	331	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	332	ri.last = ev_now ();
233		333
234	push_front (ri);	334	push_front (ri);
235		335
236	return true;	336	return true;
237	}	337	}
238	else	338	else
239	{	339	{
240	net_rateinfo ri (*i);	340	net_rateinfo ri (*i);
241	erase (i);	341	erase (i);
242		342
243	ri.pcnt = ri.pcnt * ALPHA;	343	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	344	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		345
246	ri.last = NOW;	346	ri.last = ev_now ();
247		347
248	double dif = ri.diff / ri.pcnt;	348	double dif = ri.diff / ri.pcnt;
249		349
250	bool send = dif > CUTOFF;	350	bool send = dif > NRL_CUTOFF;
251		351
252	if (dif > MAXDIF)	352	if (dif > NRL_MAXDIF)
253	{	353	{
254	ri.pcnt = 1.;	354	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	355	ri.diff = NRL_MAXDIF;
256	}	356	}
257	else if (send)	357	else if (send)
258	ri.pcnt++;	358	ri.pcnt++;
259		359
260	push_front (ri);	360	push_front (ri);
265		365
266	/////////////////////////////////////////////////////////////////////////////	366	/////////////////////////////////////////////////////////////////////////////
267		367
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	368	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
269		369
		370	void
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	371	hmac_packet::hmac_gen (crypto_ctx *ctx)
271	{	372	{
272	unsigned int xlen;	373	unsigned int xlen;
273		374
274	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
275		376
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
278	len - sizeof (hmac_packet));	379	len - sizeof (hmac_packet)));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	380	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
280	}	381	}
281		382
282	void	383	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	384	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	385	{
…		…
293	hmac_gen (ctx);	394	hmac_gen (ctx);
294		395
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	396	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	397	}
297		398
		399	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	400	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	401	{
300	type = type_;	402	type = type_;
301		403
302	int src = THISNODE->id;	404	int src = THISNODE->id;
303		405
…		…
307	}	409	}
308		410
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	411	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	412	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		413
312	struct vpndata_packet:vpn_packet	414	struct vpndata_packet : vpn_packet
		415	{
		416	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		417
		418	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		419	tap_packet unpack (connection conn, u32 &seqno);
		420
		421	private:
		422	const u32 data_hdr_size () const
313	{	423	{
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;	424	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	425	}
		426	};
325		427
326	void	428	void
327	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	429	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
328	{	430	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	431	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	432	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	433	ptype type = PT_DATA_UNCOMPRESSED;
332		434
333	#if ENABLE_COMPRESSION	435	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	436	u8 cdata[MAX_MTU];
335	u32 cl;
336		437
		438	if (conn->features & FEATURE_COMPRESSION)
		439	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	440	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		441
338	if (cl)	442	if (cl)
339	{	443	{
340	type = PT_DATA_COMPRESSED;	444	type = PT_DATA_COMPRESSED;
341	d = cdata;	445	d = cdata;
342	l = cl + 2;	446	l = cl + 2;
343		447
344	d[0] = cl >> 8;	448	d[0] = cl >> 8;
345	d[1] = cl;	449	d[1] = cl;
		450	}
346	}	451	}
347	#endif	452	#endif
348		453
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	454	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		455
351	struct {	456	struct {
352	#if RAND_SIZE	457	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	458	u8 rnd[RAND_SIZE];
354	#endif	459	#endif
355	u32 seqno;	460	u32 seqno;
356	} datahdr;	461	} datahdr;
357		462
358	datahdr.seqno = ntohl (seqno);	463	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	464	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	465	// NB: a constant (per session) random prefix
		466	// is likely enough, but we don't take any chances.
		467	conn->oiv.get (datahdr.rnd, RAND_SIZE);
361	#endif	468	#endif
362		469
363	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	473	outl += outl2;
367		474
368	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	477	(unsigned char *) d, l));
371	outl += outl2;	478	outl += outl2;
372		479
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	481	outl += outl2;
375		482
376	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
377		484
378	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	494	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
389	u8 *d;	496	u8 *d;
390	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
391		498
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		500
394	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
396		503
397	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	505	d = cdata;
399	else	506	else
400	#endif	507	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
402		509
403	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 )(&p->len + 1) == &(p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	518	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	520	outl += outl2;
408		521
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	523	outl += outl2;
411		524
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	525	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		526
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	552	}
440	};	553	};
441		554
442	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
443	{	556	{
444	// actually, hmaclen cannot be checked because the hmac	557	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;	558	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	559	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	560	u32 cipher_nid, mac_nid, auth_nid;
450		561
451	const u8 curflags () const	562	void setup (ptype type, int dst);
		563	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		564
		565	static u8 get_features ()
452	{	566	{
		567	u8 f = 0;
		568	#if ENABLE_COMPRESSION
		569	f \|= FEATURE_COMPRESSION;
		570	#endif
		571	#if ENABLE_ROHC
		572	f \|= FEATURE_ROHC;
		573	#endif
		574	#if ENABLE_BRIDGING
		575	f \|= FEATURE_BRIDGING;
		576	#endif
453	return 0x80	577	return f;
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	578	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	579	};
460		580
		581	void
461	void config_packet::setup (ptype type, int dst)	582	config_packet::setup (ptype type, int dst)
462	{	583	{
463	prot_major = PROTOCOL_MAJOR;	584	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	585	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	586	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	587	flags = 0;
467	flags = curflags ();	588	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		589
		590	strncpy ((char *)serial, conf.serial, sizeof (serial));
		591
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	592	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	593	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		594	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
473		595
474	len = sizeof (*this) - sizeof (net_packet);	596	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	597	set_hdr (type, dst);
476	}	598	}
477		599
478	bool config_packet::chk_config () const	600	bool
		601	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	602	{
480	if (prot_major != PROTOCOL_MAJOR)	603	if (prot_major != PROTOCOL_MAJOR)
481	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	604	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		605	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
482	else if (randsize != RAND_SIZE)	606	else if (randsize != RAND_SIZE)
483	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	607	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
484	else if (hmaclen != HMACLENGTH)	608	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
485	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
486	else if (flags != curflags ())
487	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
488	else if (challengelen != sizeof (rsachallenge))
489	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
490	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	609	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
491	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	610	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
492	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	611	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
493	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
494	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	612	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
495	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	613	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		614	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		615	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		616	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		617	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
496	else	618	else
		619	{
		620	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		621
		622	if (cmp > 0)
		623	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		624	conf->nodename, (const char *)rsi);
		625	else if (cmp == 0)
497	return true;	626	return true;
		627	}
498		628
499	return false;	629	return false;
500	}	630	}
501		631
502	struct auth_req_packet : config_packet	632	struct auth_req_packet : config_packet // UNPROTECTED
503	{	633	{
504	char magic[8];	634	char magic[8];
505	u8 initiate; // false if this is just an automatic reply	635	u8 initiate; // false if this is just an automatic reply
506	u8 protocols; // supported protocols (will get patches on forward)	636	u8 protocols; // supported protocols (will be patched on forward)
507	u8 pad2, pad3;	637	u8 pad2, pad3;
508	rsaid id;	638	auth_encr encr;
509	rsaencrdata encr;
510		639
511	auth_req_packet (int dst, bool initiate_, u8 protocols_)	640	auth_req_packet (int dst, bool initiate_, u8 protocols_)
512	{	641	{
513	config_packet::setup (PT_AUTH_REQ, dst);	642	config_packet::setup (PT_AUTH_REQ, dst);
514	strncpy (magic, MAGIC, 8);	643	memcpy (magic, MAGIC, 8);
515	initiate = !!initiate_;	644	initiate = !!initiate_;
516	protocols = protocols_;	645	protocols = protocols_;
517		646
518	len = sizeof (*this) - sizeof (net_packet);	647	len = sizeof (*this) - sizeof (net_packet);
519	}	648	}
520	};	649	};
521		650
522	struct auth_res_packet : config_packet	651	struct auth_res_packet : vpn_packet // UNPROTECTED
523	{	652	{
524	rsaid id;
525	u8 pad1, pad2, pad3;
526	u8 response_len; // encrypted length
527	rsaresponse response;	653	auth_response response;
528		654
529	auth_res_packet (int dst)	655	auth_res_packet (int dst)
530	{	656	{
531	config_packet::setup (PT_AUTH_RES, dst);	657	set_hdr (PT_AUTH_RES, dst);
532		658
533	len = sizeof (*this) - sizeof (net_packet);	659	len = sizeof (*this) - sizeof (net_packet);
534	}	660	}
535	};	661	};
536		662
…		…
566	};	692	};
567		693
568	/////////////////////////////////////////////////////////////////////////////	694	/////////////////////////////////////////////////////////////////////////////
569		695
570	void	696	void
571	connection::connection_established ()	697	connection::connection_established (const sockinfo &rsi)
572	{	698	{
		699	if (!have_snd_auth \|\| !have_rcv_auth)
		700	return;
		701
		702	si = rsi;
		703	protocol = rsi.prot;
		704
		705	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		706	conf->nodename, (const char *)rsi,
		707	is_direct ? "direct" : "forwarded",
		708	PROTOCOL_MAJOR, prot_minor);
		709
		710	if (::conf.script_node_up)
		711	{
		712	run_script_cb *cb = new run_script_cb;
		713	cb->set<connection, &connection::script_node_up> (this);
		714	run_script_queued (cb, _("node-up command execution failed, continuing."));
		715	}
		716
		717	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		718	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		719
		720	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		721	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		722
		723	oiv.reset ();
		724
		725	// make sure rekeying timeouts are slightly asymmetric
		726	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		727	rekey.start (rekey_interval, rekey_interval);
		728
		729	keepalive.start (::conf.keepalive);
		730
		731	// send queued packets
573	if (ictx && octx)	732	if (ictx && octx)
574	{	733	{
575	connectmode = conf->connectmode;	734	while (tap_packet p = (tap_packet )data_queue.get ())
576
577	rekey.start (NOW + ::conf.rekey);
578	keepalive.start (NOW + ::conf.keepalive);
579
580	// send queued packets
581	if (ictx && octx)
582	{	735	{
583	while (tap_packet p = (tap_packet )data_queue.get ())
584	{
585	send_data_packet (p);	736	if (p->len) send_data_packet (p);
586	delete p;	737	delete p;
587	}
588
589	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
590	{
591	send_vpn_packet (p, si, IPTOS_RELIABILITY);
592	delete p;
593	}
594	}	738	}
		739
		740	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		741	{
		742	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		743	delete p;
		744	}
595	}	745	}
		746
		747	vpn->connection_established (this);
		748	}
		749
		750	void
		751	connection::reset_si ()
		752	{
		753	if (vpn->can_direct (THISNODE, conf))
		754	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
596	else	755	else
597	{	756	{
598	retry_cnt = 0;	757	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
599	establish_connection.start (NOW + 5);	758	protocol = 0;
600	keepalive.reset ();
601	rekey.reset ();
602	}	759	}
603	}
604
605	void
606	connection::reset_si ()
607	{
608	protocol = best_protocol (THISNODE->protocols & conf->protocols);
609
610	// mask out protocols we cannot establish
611	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
612	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
613		760
614	si.set (conf, protocol);	761	si.set (conf, protocol);
		762
		763	is_direct = si.valid ();
615	}	764	}
616		765
617	// ensure sockinfo is valid, forward if necessary	766	// ensure sockinfo is valid, forward if necessary
618	const sockinfo &	767	const sockinfo &
619	connection::forward_si (const sockinfo &si) const	768	connection::forward_si (const sockinfo &si) const
620	{	769	{
621	if (!si.valid ())	770	if (!si.valid ())
622	{	771	{
623	connection *r = vpn->find_router ();	772	connection *r = vpn->find_router_for (this);
624		773
625	if (r)	774	if (r)
626	{	775	{
627	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	776	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
628	conf->nodename, r->conf->nodename);	777	conf->nodename, r->conf->nodename);
629	return r->si;	778	return r->si;
630	}	779	}
631	else	780	else
632	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	781	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
633	conf->nodename);	782	conf->nodename);
634	}	783	}
635		784
636	return si;	785	return si;
637	}	786	}
…		…
647	connection::send_ping (const sockinfo &si, u8 pong)	796	connection::send_ping (const sockinfo &si, u8 pong)
648	{	797	{
649	ping_packet *pkt = new ping_packet;	798	ping_packet *pkt = new ping_packet;
650		799
651	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	800	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		801
		802	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
652	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	803	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
653		804
654	delete pkt;	805	delete pkt;
655	}	806	}
656		807
…		…
671	void	822	void
672	connection::send_auth_request (const sockinfo &si, bool initiate)	823	connection::send_auth_request (const sockinfo &si, bool initiate)
673	{	824	{
674	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	825	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
675		826
676	rsachallenge chg;	827	generate_auth_data ();
		828	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
677		829
678	rsa_cache.gen (pkt->id, chg);
679
680	if (0 > RSA_public_encrypt (sizeof chg,
681	(unsigned char )&chg, (unsigned char )&pkt->encr,
682	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
683	fatal ("RSA_public_encrypt error");
684
685	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	830	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
686
687	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	831	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
688		832
689	delete pkt;	833	delete pkt;
690	}	834	}
691		835
692	void	836	void
693	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	837	connection::send_auth_response (const sockinfo &si)
694	{	838	{
695	auth_res_packet *pkt = new auth_res_packet (conf->id);	839	auth_res_packet *pkt = new auth_res_packet (conf->id);
696		840
697	pkt->id = id;	841	auth_hash (rcv_auth, pkt->response.mac);
		842	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
698		843
699	rsa_hash (id, chg, pkt->response);
700
701	pkt->hmac_set (octx);
702
703	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	844	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
704
705	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	845	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
706		846
707	delete pkt;	847	delete pkt;
708	}	848	}
709		849
710	void	850	void
711	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	851	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
712	{	852	{
713	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	853	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
714	conf->id, rid, (const char *)rsi);	854	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		855	conf->protocols);
715		856
716	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	857	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
717		858
718	r->hmac_set (octx);	859	r->hmac_set (octx);
719	send_vpn_packet (r, si);	860	send_vpn_packet (r, si);
720		861
721	delete r;	862	delete r;
722	}	863	}
723		864
724	void	865	inline void
725	connection::establish_connection_cb (time_watcher &w)	866	connection::establish_connection_cb (ev::timer &w, int revents)
726	{	867	{
727	if (ictx \|\| conf == THISNODE	868	if (!(ictx && octx)
		869	&& conf != THISNODE
728	\|\| connectmode == conf_node::C_NEVER	870	&& connectmode != conf_node::C_NEVER
729	\|\| connectmode == conf_node::C_DISABLED)	871	&& connectmode != conf_node::C_DISABLED
730	w.at = TSTAMP_CANCEL;	872	&& !w.is_active ())
731	else if (w.at <= NOW)
732	{	873	{
733	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	874	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
734		875	// and stop trying. should probably be handled by a per-connection expire handler.
735	if (retry_int < 3600 * 8)	876	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		877	{
		878	reset_connection ();
736	retry_cnt++;	879	return;
		880	}
737		881
738	w.at = NOW + retry_int;	882	last_establish_attempt = ev_now ();
		883
		884	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		885	? (retry_cnt & 3) + 1
		886	: 1 << (retry_cnt >> 2));
739		887
740	reset_si ();	888	reset_si ();
741		889
742	if (si.prot && !si.host)	890	bool slow = si.prot & PROT_SLOW;
		891
		892	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		893	{
		894	/TODO/ /* start the timer so we don't recurse endlessly */
		895	w.start (1);
743	vpn->send_connect_request (conf->id);	896	vpn->send_connect_request (this);
		897	}
744	else	898	else
745	{	899	{
		900	if (si.valid ())
		901	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		902	conf->nodename, (const char *)si);
		903
746	const sockinfo &dsi = forward_si (si);	904	const sockinfo &dsi = forward_si (si);
		905
		906	slow = slow \|\| (dsi.prot & PROT_SLOW);
747		907
748	if (dsi.valid () && auth_rate_limiter.can (dsi))	908	if (dsi.valid () && auth_rate_limiter.can (dsi))
749	{	909	{
750	if (retry_cnt < 4)	910	if (retry_cnt < 4)
751	send_auth_request (dsi, true);	911	send_auth_request (dsi, true);
752	else	912	else
753	send_ping (dsi, 0);	913	send_ping (dsi, 0);
754	}	914	}
755	}	915	}
		916
		917	retry_int *= slow ? 8. : 0.9;
		918
		919	if (retry_int < conf->max_retry)
		920	retry_cnt++;
		921	else
		922	retry_int = conf->max_retry;
		923
		924	w.start (retry_int);
756	}	925	}
757	}	926	}
758		927
759	void	928	void
760	connection::reset_connection ()	929	connection::reset_connection ()
…		…
763	{	932	{
764	slog (L_INFO, _("%s(%s): connection lost"),	933	slog (L_INFO, _("%s(%s): connection lost"),
765	conf->nodename, (const char *)si);	934	conf->nodename, (const char *)si);
766		935
767	if (::conf.script_node_down)	936	if (::conf.script_node_down)
768	run_script (run_script_cb (this, &connection::script_node_down), false);	937	{
		938	run_script_cb *cb = new run_script_cb;
		939	cb->set<connection, &connection::script_node_down> (this);
		940	run_script_queued (cb, _("node-down command execution failed, continuing."));
		941	}
769	}	942	}
770		943
771	delete ictx; ictx = 0;	944	delete ictx; ictx = 0;
772	delete octx; octx = 0;	945	delete octx; octx = 0;
773		946
774	si.host= 0;	947	si.host = 0;
775		948
		949	have_snd_auth = false;
		950	have_rcv_auth = false;
		951	auth_expire = 0.;
		952
776	last_activity = 0;	953	last_activity = 0.;
		954	//last_si_change = 0.;
777	retry_cnt = 0;	955	retry_cnt = 0;
778		956
779	rekey.reset ();	957	rekey.stop ();
780	keepalive.reset ();	958	keepalive.stop ();
781	establish_connection.reset ();	959	establish_connection.stop ();
782	}	960	}
783		961
784	void	962	void
785	connection::shutdown ()	963	connection::shutdown ()
786	{	964	{
…		…
788	send_reset (si);	966	send_reset (si);
789		967
790	reset_connection ();	968	reset_connection ();
791	}	969	}
792		970
793	void	971	// poor-man's rekeying
794	connection::rekey_cb (time_watcher &w)	972	inline void
		973	connection::rekey_cb (ev::timer &w, int revents)
795	{	974	{
796	w.at = TSTAMP_CANCEL;
797
798	reset_connection ();	975	reset_connection ();
799	establish_connection ();	976	establish_connection ();
800	}	977	}
801		978
802	void	979	void
803	connection::send_data_packet (tap_packet *pkt, bool broadcast)	980	connection::send_data_packet (tap_packet *pkt)
804	{	981	{
805	vpndata_packet *p = new vpndata_packet;	982	vpndata_packet *p = new vpndata_packet;
806	int tos = 0;	983	int tos = 0;
807		984
808	// I am not hilarious about peeking into packets, but so be it.	985	// I am not hilarious about peeking into packets, but so be it.
809	if (conf->inherit_tos	986	if (conf->inherit_tos && pkt->is_ipv4 ())
810	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
811	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
812	tos = (*pkt)[15] & IPTOS_TOS_MASK;	987	tos = (*pkt)[15] & IPTOS_TOS_MASK;
813		988
814	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	989	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815	send_vpn_packet (p, si, tos);	990	send_vpn_packet (p, si, tos);
816		991
817	delete p;	992	delete p;
818		993
819	if (oseqno > MAX_SEQNO)	994	if (oseqno > MAX_SEQNO)
820	rekey ();	995	rekey ();
821	}	996	}
822		997
823	void	998	void
		999	connection::post_inject_queue ()
		1000	{
		1001	// force a connection every now and when when packets are sent (max 1/s)
		1002	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		1003	establish_connection.stop ();
		1004
		1005	establish_connection ();
		1006	}
		1007
		1008	void
824	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1009	connection::inject_data_packet (tap_packet *pkt)
825	{	1010	{
826	if (ictx && octx)	1011	if (ictx && octx)
827	send_data_packet (pkt, broadcast);	1012	send_data_packet (pkt);
828	else	1013	else
829	{	1014	{
830	if (!broadcast)//DDDD
831	data_queue.put (new tap_packet (*pkt));	1015	data_queue.put (new tap_packet (*pkt));
832		1016	post_inject_queue ();
833	establish_connection ();
834	}	1017	}
835	}	1018	}
836		1019
		1020	void
837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1021	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
838	{	1022	{
839	if (ictx && octx)	1023	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	1024	send_vpn_packet (pkt, si, tos);
841	else	1025	else
842	{	1026	{
843	vpn_queue.put (new vpn_packet (*pkt));	1027	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
844		1028	post_inject_queue ();
845	establish_connection ();
846	}	1029	}
847	}	1030	}
848		1031
849	void	1032	void
850	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1033	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
851	{	1034	{
852	last_activity = NOW;	1035	last_activity = ev_now ();
853		1036
854	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1037	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1038	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1039
		1040	if (connectmode == conf_node::C_DISABLED)
		1041	return;
856		1042
857	switch (pkt->typ ())	1043	switch (pkt->typ ())
858	{	1044	{
859	case vpn_packet::PT_PING:	1045	case vpn_packet::PT_PING:
		1046	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1047
860	// we send pings instead of auth packets after some retries,	1048	// we send pings instead of auth packets after some retries,
861	// so reset the retry counter and establish a connection	1049	// so reset the retry counter and establish a connection
862	// when we receive a ping.	1050	// when we receive a ping.
863	if (!ictx)	1051	if (!ictx)
864	{	1052	{
865	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
866	send_auth_request (rsi, true);	1054	send_auth_request (rsi, true);
867	}	1055	}
868	else	1056	else
		1057	// we would love to change the socket address here, but ping's aren't
		1058	// authenticated, so we best ignore it.
869	send_ping (rsi, 1); // pong	1059	send_ping (rsi, 1); // pong
870		1060
871	break;	1061	break;
872		1062
873	case vpn_packet::PT_PONG:	1063	case vpn_packet::PT_PONG:
		1064	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1065
		1066	// a PONG might mean that the other side doesn't really know
		1067	// about our desire for communication.
		1068	establish_connection ();
874	break;	1069	break;
875		1070
876	case vpn_packet::PT_RESET:	1071	case vpn_packet::PT_RESET:
877	{	1072	{
878	reset_connection ();	1073	reset_connection ();
879		1074
880	config_packet p = (config_packet ) pkt;	1075	config_packet p = (config_packet ) pkt;
881		1076
882	if (!p->chk_config ())	1077	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
883	{
884	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
885	conf->nodename, (const char *)rsi);
886	connectmode = conf_node::C_DISABLED;
887	}
888	else if (connectmode == conf_node::C_ALWAYS)
889	establish_connection ();	1078	establish_connection ();
890	}	1079	}
891	break;	1080	break;
892		1081
893	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
894	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
895	{	1084	{
896	auth_req_packet p = (auth_req_packet ) pkt;	1085	auth_req_packet p = (auth_req_packet )pkt;
897		1086
898	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1087	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1088	conf->nodename, p->initiate ? "initiate" : "reply",
		1089	p->protocols, p->features);
899		1090
900	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (memcmp (p->magic, MAGIC, 8))
		1092	{
		1093	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1094	conf->nodename, (const char *)rsi);
		1095	}
		1096	else if (p->chk_config (conf, rsi))
901	{	1097	{
902	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
903	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1099	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
904	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
906		1102
907	if (p->initiate)	1103	if (p->initiate)
908	send_auth_request (rsi, false);	1104	send_auth_request (rsi, false);
909		1105
910	rsachallenge k;	1106	auth_data auth;
911		1107
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	1108	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
913	(unsigned char )&p->encr, (unsigned char )&k,	1109	{
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1110	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916	conf->nodename, (const char *)rsi);	1111	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1112	}
917	else	1113	else
918	{	1114	{
919	delete octx;	1115	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
920		1116
921	octx = new crypto_ctx (k, 1);	1117	rcv_auth = auth;
922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1118	have_rcv_auth = true;
923		1119
		1120	send_auth_response (rsi);
		1121
		1122	if (chg)
		1123	{
924	conf->protocols = p->protocols;	1124	conf->protocols = p->protocols;
		1125	features = p->features & config_packet::get_features ();
925		1126
926	send_auth_response (rsi, p->id, k);
927
928	connection_established ();	1127	connection_established (rsi);
929
930	break;	1128	}
931	}	1129	}
		1130
		1131	break;
932	}	1132	}
933	else
934	slog (L_WARN, _("%s(%s): protocol mismatch"),
935	conf->nodename, (const char *)rsi);
936		1133
937	send_reset (rsi);	1134	send_reset (rsi);
938	}	1135	}
939		1136
940	break;	1137	break;
941		1138
942	case vpn_packet::PT_AUTH_RES:	1139	case vpn_packet::PT_AUTH_RES:
943	{	1140	{
944	auth_res_packet p = (auth_res_packet ) pkt;	1141	auth_res_packet p = (auth_res_packet )pkt;
945		1142
946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1143	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
947		1144
948	if (p->chk_config ())	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
949	{	1146	{
950	if (p->prot_minor != PROTOCOL_MINOR)
951	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
952	conf->nodename, (const char *)rsi,
953	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
954
955	rsachallenge chg;
956
957	if (!rsa_cache.find (p->id, chg))
958	{
959	slog (L_ERR, _("%s(%s): unrequested auth response"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
960	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
961	break;
962	}
963	else
964	{
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);
966
967	if (!p->hmac_chk (cctx))
968	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
969	"could be an attack, or just corruption or an synchronization error"),
970	conf->nodename, (const char *)rsi);
971	else
972	{
973	rsaresponse h;
974
975	rsa_hash (p->id, chg, h);
976
977	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
978	{
979	prot_minor = p->prot_minor;
980
981	delete ictx; ictx = cctx;
982
983	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
984
985	si = rsi;
986	protocol = rsi.prot;
987
988	connection_established ();
989
990	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
991	conf->nodename, (const char *)rsi,
992	p->prot_major, p->prot_minor);
993
994	if (::conf.script_node_up)
995	run_script (run_script_cb (this, &connection::script_node_up), false);
996
997	break;
998	}
999	else
1000	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1001	conf->nodename, (const char *)rsi);
1002	}
1003
1004	delete cctx;
1005	}
1006	}	1149	}
		1150	else if (!have_snd_auth)
		1151	{
		1152	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
		1153
		1154	have_snd_auth = true;
		1155	connection_established (rsi);
		1156	}
		1157
		1158	break;
1007	}	1159	}
1008		1160
1009	send_reset (rsi);	1161	send_reset (rsi);
1010	break;	1162	break;
1011		1163
…		…
1021	{	1173	{
1022	vpndata_packet p = (vpndata_packet )pkt;	1174	vpndata_packet p = (vpndata_packet )pkt;
1023		1175
1024	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1025	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1177	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1026	"could be an attack, or just corruption or an synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1027	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1028	else	1180	else
1029	{	1181	{
1030	u32 seqno;	1182	u32 seqno;
1031	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1032		1185
1033	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1034	{	1187	{
1035	vpn->tap->send (d);	1188	vpn->tap->send (d);
1036		1189
1037	if (p->dst () == 0) // re-broadcast
1038	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1039	{
1040	connection c = i;
1041
1042	if (c->conf != THISNODE && c->conf != conf)
1043	c->inject_data_packet (d);
1044	}
1045
1046	if (si != rsi)	1190	if (si != rsi)
1047	{	1191	{
1048	// fast re-sync on connection changes, useful especially for tcp/ip	1192	// fast re-sync on source address changes, useful especially for tcp/ip
		1193	//if (last_si_change < ev_now () + 5.)
1049	si = rsi;	1194	// {
1050
1051	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1052	conf->nodename, (const char )si, (const char )rsi);	1196	conf->nodename, (const char )si, (const char )rsi);
		1197
		1198	si = rsi;
		1199
		1200	if (::conf.script_node_change)
		1201	{
		1202	run_script_cb *cb = new run_script_cb;
		1203	cb->set<connection, &connection::script_node_change> (this);
		1204	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1205	}
		1206
		1207	// }
		1208	//else
		1209	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1210	// conf->nodename, (const char )si, (const char )rsi);
1053	}	1211	}
1054
1055	delete d;
1056
1057	break;
1058	}	1212	}
		1213	else if (seqclass == 1) // far history
		1214	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1217	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1218	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1219	else if (seqclass == 3) // reset
		1220	{
		1221	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1222	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1223	send_reset (rsi);
		1224	}
		1225
		1226	delete d;
		1227	break;
1059	}	1228	}
1060	}	1229	}
1061		1230
1062	send_reset (rsi);	1231	send_reset (rsi);
1063	break;	1232	break;
1064		1233
1065	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1066	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1067	{	1236	{
1068	connect_req_packet p = (connect_req_packet ) pkt;	1237	connect_req_packet p = (connect_req_packet )pkt;
1069		1238
1070	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1239	if (p->id > 0 && p->id <= vpn->conns.size ())
1071	connection *c = vpn->conns[p->id - 1];
1072	conf->protocols = p->protocols;
1073
1074	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1075	conf->id, p->id, c->ictx && c->octx);
1076
1077	if (c->ictx && c->octx)
1078	{	1240	{
		1241	connection *c = vpn->conns[p->id - 1];
		1242	conf->protocols = p->protocols;
		1243
		1244	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1245	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1246	p->protocols,
		1247	c->ictx && c->octx);
		1248
		1249	if (c->ictx && c->octx)
		1250	{
1079	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1080	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
1081	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
1082	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1254	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1255	}
		1256	else
		1257	c->establish_connection ();
1083	}	1258	}
1084	else	1259	else
1085	c->establish_connection ();	1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
1086	}	1263	}
1087		1264
1088	break;	1265	break;
1089		1266
1090	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
1091	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1092	{	1269	{
1093	connect_info_packet p = (connect_info_packet ) pkt;	1270	connect_info_packet p = (connect_info_packet )pkt;
1094		1271
1095	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1272	if (p->id > 0 && p->id <= vpn->conns.size ())
1096		1273	{
1097	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1098		1275
1099	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1100	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1277	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1101	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1102		1279
1103	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1280	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1104	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1281	conf->nodename,
		1282	vpn->conns[p->id - 1]->conf->nodename,
		1283	(const char *)p->si,
		1284	p->protocols,
		1285	protocol,
		1286	p->si.supported_protocols (c->conf),
		1287	!c->ictx && !c->octx);
1105		1288
1106	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1107		1290
1108	if (dsi.valid ())	1291	if (dsi.valid ())
1109	c->send_auth_request (dsi, true);	1292	c->send_auth_request (dsi, true);
		1293	else
		1294	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1295	vpn->conns[p->id - 1]->conf->nodename,
		1296	(const char *)p->si);
		1297	}
		1298	else
		1299	slog (L_WARN,
		1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1301	p->id);
1110	}	1302	}
1111		1303
1112	break;	1304	break;
1113		1305
1114	default:	1306	default:
1115	send_reset (rsi);	1307	send_reset (rsi);
1116	break;	1308	break;
1117	}	1309	}
1118	}	1310	}
1119		1311
1120	void connection::keepalive_cb (time_watcher &w)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1121	{	1314	{
1122	if (NOW >= last_activity + ::conf.keepalive + 30)	1315	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1316
		1317	if (when >= 0)
		1318	w.start (when);
		1319	else if (when < -15)
1123	{	1320	{
1124	reset_connection ();	1321	reset_connection ();
1125	establish_connection ();	1322	establish_connection ();
1126	}	1323	}
1127	else if (NOW < last_activity + ::conf.keepalive)
1128	w.at = last_activity + ::conf.keepalive;
1129	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1130	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1131	{	1326	{
		1327	w.start (3);
1132	send_ping (si);	1328	send_ping (si);
1133	w.at = NOW + 5;
1134	}	1329	}
1135	else if (NOW < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1136	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1137	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1138	w.at = last_activity + ::conf.keepalive + 10;	1333	w.start (when + 10);
1139	else	1334	else
1140	reset_connection ();	1335	reset_connection ();
1141	}	1336	}
1142		1337
		1338	void
1143	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1144	{	1340	{
1145	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1341	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1146		1342
1147	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1343	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1344	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1345	THISNODE->protocols);
1148	p->hmac_set (octx);	1346	p->hmac_set (octx);
1149	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1150		1348
1151	delete p;	1349	delete p;
1152	}	1350	}
1153		1351
1154	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1155	{	1354	{
1156	vpn->script_if_up ();
1157
1158	char *env;	1355	char *env;
		1356	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1357	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1358	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1359	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1360	conf->id & 0xff); putenv (env);
		1361	}
		1362
		1363	void
		1364	connection::script_init_connect_env ()
		1365	{
		1366	vpn->script_init_env ();
		1367
		1368	char *env;
1159	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1369	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1370	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1160	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1161	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1162	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1163	}	1374	}
1164		1375
		1376	inline const char *
1165	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1166	{	1378	{
1167	script_node ();	1379	script_init_connect_env ();
1168		1380
1169	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1170		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1171	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1172	}
1173		1388
		1389	return filename;
		1390	}
		1391
		1392	inline const char *
		1393	connection::script_node_change ()
		1394	{
		1395	script_init_connect_env ();
		1396
		1397	putenv ((char *)"STATE=change");
		1398
		1399	char *filename;
		1400	asprintf (&filename,
		1401	"%s/%s",
		1402	confbase,
		1403	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1404
		1405	return filename;
		1406	}
		1407
		1408	inline const char *
1174	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1175	{	1410	{
1176	script_node ();	1411	script_init_connect_env ();
1177		1412
1178	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1179		1414
1180	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
1181	}	1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1182		1420
		1421	return filename;
		1422	}
		1423
1183	connection::connection(struct vpn *vpn_)	1424	connection::connection (struct vpn vpn, conf_node conf)
1184	: vpn(vpn_)	1425	: vpn(vpn), conf(conf),
1185	, rekey (this, &connection::rekey_cb)	1426	#if ENABLE_DNS
1186	, keepalive (this, &connection::keepalive_cb)	1427	dns (0),
		1428	#endif
		1429	data_queue(conf->max_ttl, conf->max_queue + 1),
		1430	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1431	{
		1432	rekey .set<connection, &connection::rekey_cb > (this);
		1433	keepalive .set<connection, &connection::keepalive_cb > (this);
1187	, establish_connection (this, &connection::establish_connection_cb)	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1188	{	1435
		1436	last_establish_attempt = 0.;
1189	octx = ictx = 0;	1437	octx = ictx = 0;
1190	retry_cnt = 0;
1191		1438
1192	connectmode = conf_node::C_ALWAYS; // initial setting	1439	connectmode = conf->connectmode;
		1440
		1441	// queue a dummy packet to force an initial connection attempt
		1442	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1443	vpn_queue.put (new net_packet);
		1444
1193	reset_connection ();	1445	reset_connection ();
1194	}	1446	}
1195		1447
1196	connection::~connection ()	1448	connection::~connection ()
1197	{	1449	{
1198	shutdown ();	1450	shutdown ();
1199	}	1451	}
1200		1452
		1453	void
1201	void connection_init ()	1454	connection_init ()
1202	{	1455	{
1203	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1204	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1205	}	1458	}
1206		1459

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Comparing gvpe/src/connection.C (file contents): Revision 1.15 by pcg, Fri Aug 8 10:58:28 2003 UTC vs. Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.15 by pcg, Fri Aug 8 10:58:28 2003 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC