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

Comparing gvpe/src/connection.C (file contents):
Revision 1.7 by pcg, Sat Apr 5 17:54:22 2003 UTC vs.
Revision 1.104 by root, Fri Jul 19 18:18:27 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, const ecdh_key &b, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
73		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
74	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
75	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response 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	}	189	}
81		190
82	struct rsa_entry {	191	void
83	tstamp expire;	192	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	193	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	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	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
131		199
132	} rsa_cache;	200	// eventual response data
133		201	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	{	202	}
140	w.at = NOW + RSA_TTL;
141		203
142	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
143	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	206	}
149		207
150	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
151		209
152	void pkt_queue::put (tap_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
153	{	212	{
154	if (queue[i])	213	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		214
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	tap_packet *pkt_queue::get ()
166	{
167	tap_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	215	i = 0;
182	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	219	}
184		220
185	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
186	{	222	{
187	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
188	delete queue[i];	226	delete [] queue;
189	}	227	}
190		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
191	struct net_rateinfo {	285	struct net_rateinfo
		286	{
192	u32 host;	287	u32 host;
193	double pcnt, diff;	288	double pcnt, diff;
194	tstamp last;	289	tstamp last;
195	};	290	};
196		291
197	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	294	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
201	{	296	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
		300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
205		301
206	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	303	bool can (u32 host);
208	};	304	};
209		305
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		307
		308	bool
212	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
213	{	310	{
214	iterator i;	311	iterator i;
215		312
216	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
217	if (i->host == host)	314	if (i->host == host)
218	break;	315	break;
219	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
220	i = erase (i);	317	i = erase (i);
221	else	318	else
222	i++;	319	i++;
223		320
224	if (i == end ())	321	if (i == end ())
225	{	322	{
226	net_rateinfo ri;	323	net_rateinfo ri;
227		324
228	ri.host = host;	325	ri.host = host;
229	ri.pcnt = 1.;	326	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	327	ri.diff = NRL_MAXDIF;
231	ri.last = NOW;	328	ri.last = ev_now ();
232		329
233	push_front (ri);	330	push_front (ri);
234		331
235	return true;	332	return true;
236	}	333	}
237	else	334	else
238	{	335	{
239	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
240	erase (i);	337	erase (i);
241		338
242	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
244		341
245	ri.last = NOW;	342	ri.last = ev_now ();
246		343
		344	double dif = ri.diff / ri.pcnt;
		345
247	bool send = ri.diff / ri.pcnt > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
248		347
		348	if (dif > NRL_MAXDIF)
		349	{
		350	ri.pcnt = 1.;
		351	ri.diff = NRL_MAXDIF;
		352	}
249	if (send)	353	else if (send)
250	ri.pcnt++;	354	ri.pcnt++;
251		355
252	push_front (ri);	356	push_front (ri);
253		357
254	return send;	358	return send;
255	}	359	}
256	}	360	}
257		361
258	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
259		363
260	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
261
262	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
263	{	366	{
264	unsigned int xlen;
265
266	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
267		368
268	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
269	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
270	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
271	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
272	}	372	}
273		373
274	void	374	void
275	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
276	{	376	{
277	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
278		378	hmac_gen (ctx, hmac_digest);
279	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
280	}	380	}
281		381
282	bool	382	bool
283	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (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	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	388	}
289		389
		390	void
290	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	392	{
292	type = type_;	393	type = type_;
293		394
294	int src = THISNODE->id;	395	int src = THISNODE->id;
295		396
299	}	400	}
300		401
301	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
302	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
303		404
304	struct vpndata_packet:vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		410	tap_packet unpack (connection conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
305	{	414	{
306	u8 data[MAXVPNDATA + DATAHDR]; // seqno
307
308	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
309	tap_packet unpack (connection conn, u32 &seqno);
310	private:
311
312	const u32 data_hdr_size () const
313	{
314	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
315	}
316	};	416	}
		417	};
317		418
318	void	419	void
319	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
320	{	421	{
321	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
322	int outl = 0, outl2;	423	int outl = 0, outl2;
323	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
324		425
325	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
326	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
327	u32 cl;
328		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
329	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
330	if (cl)	433	if (cl)
331	{	434	{
332	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
333	d = cdata;	436	d = cdata;
334	l = cl + 2;	437	l = cl + 2;
335		438
336	d[0] = cl >> 8;	439	d[0] = cl >> 8;
337	d[1] = cl;	440	d[1] = cl;
		441	}
338	}	442	}
339	#endif	443	#endif
340		444
341	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
342		446
343	struct {	447	struct {
344	#if RAND_SIZE	448	#if RAND_SIZE
345	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
346	#endif	450	#endif
347	u32 seqno;	451	u32 seqno;
348	} datahdr;	452	} datahdr;
349		453
350	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
351	#if RAND_SIZE	455	#if RAND_SIZE
352	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
353	#endif	459	#endif
354		460
355	EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
356	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
357	(unsigned char *) &datahdr, DATAHDR);	463	(unsigned char *) &datahdr, DATAHDR));
358	outl += outl2;	464	outl += outl2;
359		465
360	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
361	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
362	(unsigned char *) d, l);	468	(unsigned char *) d, l));
363	outl += outl2;	469	outl += outl2;
364		470
365	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	471	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
366	outl += outl2;	472	outl += outl2;
367		473
368	len = outl + data_hdr_size ();	474	len = outl + data_hdr_size ();
369		475
370	set_hdr (type, dst);	476	set_hdr (type, dst);
…		…
379	int outl = 0, outl2;	485	int outl = 0, outl2;
380	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
381	u8 *d;	487	u8 *d;
382	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
383		489
384	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
385		491
386	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
387	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
388		494
389	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
390	d = cdata;	496	d = cdata;
391	else	497	else
392	#endif	498	#endif
393	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
394		500
395	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 )(&p->len + 1) == &(p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
396	EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
397	d, &outl2,	509	d, &outl2,
398	(unsigned char *)&data, len - data_hdr_size ());	510	(unsigned char *)&data, len - data_hdr_size ()));
399	outl += outl2;	511	outl += outl2;
400		512
401	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
402	outl += outl2;	514	outl += outl2;
403		515
404	seqno = ntohl ((u32 )(d + RAND_SIZE));	516	seqno = ntohl ((u32 )(d + RAND_SIZE));
405		517
406	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
431	}	543	}
432	};	544	};
433		545
434	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
435	{	547	{
436	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
437	// field comes before this data, so peers with other
438	// hmacs simply will not work.
439	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
440	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
441	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
442		552
443	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
444	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f \|= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f \|= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f \|= FEATURE_BRIDGING;
		567	#endif
445	return 0x80	568	return f;
446	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
447	}	569	}
448
449	void setup (ptype type, int dst);
450	bool chk_config () const;
451	};	570	};
452		571
		572	void
453	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
454	{	574	{
455	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
456	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
457	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
458	hmaclen = HMACLENGTH;	578	flags = 0;
459	flags = curflags ();	579	features = get_features ();
460	challengelen = sizeof (rsachallenge);
461		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
462	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
463	digest_nid = htonl (EVP_MD_type (RSA_HASH));
464	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
465		586
466	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
467	set_hdr (type, dst);	588	set_hdr (type, dst);
468	}	589	}
469		590
470	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
471	{	593	{
472	return prot_major == PROTOCOL_MAJOR	594	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
474	&& hmaclen == HMACLENGTH	596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
475	&& flags == curflags ()	597	else if (randsize != RAND_SIZE)
476	&& challengelen == sizeof (rsachallenge)	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		599	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
480	}	603	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
481		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
		617	return true;
		618	}
		619
		620	return false;
		621	}
		622
482	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
483	{	624	{
484	char magic[8];	625	char magic[8];
485	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
486	u8 protocols; // supported protocols (will get patches on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
487	u8 pad2, pad3;	628	u8 pad2, pad3;
488	rsaid id;	629	auth_encr encr;
489	rsaencrdata encr;
490		630
491	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
492	{	632	{
493	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
494	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
495	initiate = !!initiate_;	635	initiate = !!initiate_;
496	protocols = protocols_;	636	protocols = protocols_;
497		637
498	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
499	}	639	}
500	};	640	};
501		641
502	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
503	{	643	{
504	rsaid id;
505	u8 pad1, pad2, pad3;
506	u8 response_len; // encrypted length
507	rsaresponse response;	644	auth_response response;
508		645
509	auth_res_packet (int dst)	646	auth_res_packet (int dst)
510	{	647	{
511	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
512		649
513	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
514	}	651	}
515	};	652	};
516		653
…		…
546	};	683	};
547		684
548	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
549		686
550	void	687	void
		688	connection::connection_established (const sockinfo &rsi)
		689	{
		690	if (!have_snd_auth \|\| !have_rcv_auth)
		691	return;
		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
		723	if (ictx && octx)
		724	{
		725	while (tap_packet p = (tap_packet )data_queue.get ())
		726	{
		727	if (p->len) send_data_packet (p);
		728	delete p;
		729	}
		730
		731	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
		736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
551	connection::reset_dstaddr ()	742	connection::reset_si ()
552	{	743	{
		744	if (vpn->can_direct (THISNODE, conf))
553	protocol = best_protocol (THISNODE->protocols & conf->protocols);	745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
554		746	else
555	// mask out protocols we cannot establish	747	{
556	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
557	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	749	protocol = 0;
		750	}
558		751
559	si.set (conf, protocol);	752	si.set (conf, protocol);
560	}
561		753
562	void	754	is_direct = si.valid ();
563	connection::send_ping (const sockinfo &si, u8 pong)
564	{
565	ping_packet *pkt = new ping_packet;
566
567	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
568	vpn->send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
569
570	delete pkt;
571	}	755	}
572		756
573	void	757	// ensure sockinfo is valid, forward if necessary
		758	const sockinfo &
574	connection::send_reset (const sockinfo &si)	759	connection::forward_si (const sockinfo &si) const
575	{	760	{
576	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)	761	if (!si.valid ())
577	{
578	config_packet *pkt = new config_packet;
579
580	pkt->setup (vpn_packet::PT_RESET, conf->id);
581	vpn->send_vpn_packet (pkt, si, IPTOS_MINCOST);
582
583	delete pkt;
584	}	762	{
585	}	763	connection *r = vpn->find_router_for (this);
586		764
587	void	765	if (r)
588	connection::send_auth_request (const sockinfo &si, bool initiate)
589	{
590	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
591
592	rsachallenge chg;
593
594	rsa_cache.gen (pkt->id, chg);
595
596	if (0 > RSA_public_encrypt (sizeof chg,
597	(unsigned char )&chg, (unsigned char )&pkt->encr,
598	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
599	fatal ("RSA_public_encrypt error");
600
601	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
602
603	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
604
605	delete pkt;
606	}
607
608	void
609	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
610	{
611	auth_res_packet *pkt = new auth_res_packet (conf->id);
612
613	pkt->id = id;
614
615	rsa_hash (id, chg, pkt->response);
616
617	pkt->hmac_set (octx);
618
619	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);
620
621	vpn->send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
622
623	delete pkt;
624	}
625
626	void
627	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
628	{
629	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",
630	conf->id, rid, (const char *)rsi);
631
632	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
633
634	r->hmac_set (octx);
635	vpn->send_vpn_packet (r, si);
636
637	delete r;
638	}
639
640	void
641	connection::establish_connection_cb (time_watcher &w)
642	{
643	if (ictx \|\| conf == THISNODE
644	\|\| connectmode == conf_node::C_NEVER
645	\|\| connectmode == conf_node::C_DISABLED)
646	w.at = TSTAMP_CANCEL;
647	else if (w.at <= NOW)
648	{
649	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
650
651	if (retry_int < 3600 * 8)
652	retry_cnt++;
653
654	w.at = NOW + retry_int;
655
656	if (conf->hostname)
657	{	766	{
658	reset_dstaddr ();	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
659		768	conf->nodename, r->conf->nodename);
660	if (si.valid () && auth_rate_limiter.can (si))	769	return r->si;
661	{
662	if (retry_cnt < 4)
663	send_auth_request (si, true);
664	else
665	send_ping (si, 0);
666	}
667	}	770	}
668	else	771	else
		772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
		773	conf->nodename);
		774	}
		775
		776	return si;
		777	}
		778
		779	void
		780	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		781	{
		782	if (!vpn->send_vpn_packet (pkt, si, tos))
		783	reset_connection ();
		784	}
		785
		786	void
		787	connection::send_ping (const sockinfo &si, u8 pong)
		788	{
		789	ping_packet *pkt = new ping_packet;
		790
		791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
		794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		795
		796	delete pkt;
		797	}
		798
		799	void
		800	connection::send_reset (const sockinfo &si)
		801	{
		802	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		803	{
		804	config_packet *pkt = new config_packet;
		805
		806	pkt->setup (vpn_packet::PT_RESET, conf->id);
		807	send_vpn_packet (pkt, si, IPTOS_MINCOST);
		808
		809	delete pkt;
		810	}
		811	}
		812
		813	void
		814	connection::send_auth_request (const sockinfo &si, bool initiate)
		815	{
		816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		817
		818	generate_auth_data ();
		819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
		820
		821	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
		822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
		823
		824	delete pkt;
		825	}
		826
		827	void
		828	connection::send_auth_response (const sockinfo &si)
		829	{
		830	auth_res_packet *pkt = new auth_res_packet (conf->id);
		831
		832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
		834
		835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
		836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
		837
		838	delete pkt;
		839	}
		840
		841	void
		842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
		843	{
		844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
		845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
		847
		848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
		849
		850	r->hmac_set (octx);
		851	send_vpn_packet (r, si);
		852
		853	delete r;
		854	}
		855
		856	inline void
		857	connection::establish_connection_cb (ev::timer &w, int revents)
		858	{
		859	if (!(ictx && octx)
		860	&& conf != THISNODE
		861	&& connectmode != conf_node::C_NEVER
		862	&& connectmode != conf_node::C_DISABLED
		863	&& !w.is_active ())
		864	{
		865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		866	// and stop trying. should probably be handled by a per-connection expire handler.
		867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
		870	return;
		871	}
		872
		873	last_establish_attempt = ev_now ();
		874
		875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		876	? (retry_cnt & 3) + 1
		877	: 1 << (retry_cnt >> 2));
		878
		879	reset_si ();
		880
		881	bool slow = si.prot & PROT_SLOW;
		882
		883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		884	{
		885	/TODO/ /* start the timer so we don't recurse endlessly */
		886	w.start (1);
669	vpn->connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
		889	else
		890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
		895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow \|\| (dsi.prot & PROT_SLOW);
		898
		899	if (dsi.valid () && auth_rate_limiter.can (dsi))
		900	{
		901	if (retry_cnt < 4)
		902	send_auth_request (dsi, true);
		903	else
		904	send_ping (dsi, 0);
		905	}
		906	}
		907
		908	retry_int *= slow ? 8. : 0.9;
		909
		910	if (retry_int < conf->max_retry)
		911	retry_cnt++;
		912	else
		913	retry_int = conf->max_retry;
		914
		915	w.start (retry_int);
670	}	916	}
671	}	917	}
672		918
673	void	919	void
674	connection::reset_connection ()	920	connection::reset_connection ()
…		…
677	{	923	{
678	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
679	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
680		926
681	if (::conf.script_node_down)	927	if (::conf.script_node_down)
682	run_script (run_script_cb (this, &connection::script_node_down), false);	928	{
		929	run_script_cb *cb = new run_script_cb;
		930	cb->set<connection, &connection::script_node_down> (this);
		931	run_script_queued (cb, _("node-down command execution failed, continuing."));
		932	}
683	}	933	}
684		934
685	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
686	delete octx; octx = 0;	936	delete octx; octx = 0;
687		937
688	si.host= 0;	938	si.host = 0;
689		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
690	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
691	retry_cnt = 0;	946	retry_cnt = 0;
692		947
693	rekey.reset ();	948	rekey.stop ();
694	keepalive.reset ();	949	keepalive.stop ();
695	establish_connection.reset ();	950	establish_connection.stop ();
696	}	951	}
697		952
698	void	953	void
699	connection::shutdown ()	954	connection::shutdown ()
700	{	955	{
…		…
702	send_reset (si);	957	send_reset (si);
703		958
704	reset_connection ();	959	reset_connection ();
705	}	960	}
706		961
707	void	962	// poor-man's rekeying
708	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
709	{	965	{
710	w.at = TSTAMP_CANCEL;
711
712	reset_connection ();	966	reset_connection ();
713	establish_connection ();	967	establish_connection ();
714	}	968	}
715		969
716	void	970	void
717	connection::send_data_packet (tap_packet *pkt, bool broadcast)	971	connection::send_data_packet (tap_packet *pkt)
718	{	972	{
719	vpndata_packet *p = new vpndata_packet;	973	vpndata_packet *p = new vpndata_packet;
720	int tos = 0;	974	int tos = 0;
721		975
722	if (conf->inherit_tos	976	// I am not hilarious about peeking into packets, but so be it.
723	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	977	if (conf->inherit_tos && pkt->is_ipv4 ())
724	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
725	tos = (*pkt)[15] & IPTOS_TOS_MASK;	978	tos = (*pkt)[15] & IPTOS_TOS_MASK;
726		979
727	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	980	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
728	vpn->send_vpn_packet (p, si, tos);	981	send_vpn_packet (p, si, tos);
729		982
730	delete p;	983	delete p;
731		984
732	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
733	rekey ();	986	rekey ();
734	}	987	}
735		988
736	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
737	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1000	connection::inject_data_packet (tap_packet *pkt)
738	{	1001	{
739	if (ictx && octx)	1002	if (ictx && octx)
740	send_data_packet (pkt, broadcast);	1003	send_data_packet (pkt);
741	else	1004	else
742	{	1005	{
743	if (!broadcast)//DDDD
744	queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
		1007	post_inject_queue ();
		1008	}
		1009	}
745		1010
746	establish_connection ();	1011	void
		1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		1013	{
		1014	if (ictx && octx)
		1015	send_vpn_packet (pkt, si, tos);
		1016	else
		1017	{
		1018	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
		1019	post_inject_queue ();
747	}	1020	}
748	}	1021	}
749		1022
750	void	1023	void
751	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
752	{	1025	{
753	last_activity = NOW;	1026	last_activity = ev_now ();
754		1027
755	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
756	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1030
		1031	if (connectmode == conf_node::C_DISABLED)
		1032	return;
757		1033
758	switch (pkt->typ ())	1034	switch (pkt->typ ())
759	{	1035	{
760	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
761	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
762	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
763	// when we receive a ping.	1041	// when we receive a ping.
764	if (!ictx)	1042	if (!ictx)
765	{	1043	{
766	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
767	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
768	}	1046	}
769	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
770	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
771		1051
772	break;	1052	break;
773		1053
774	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
775	break;	1060	break;
776		1061
777	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
778	{	1063	{
779	reset_connection ();	1064	reset_connection ();
780		1065
781	config_packet p = (config_packet ) pkt;	1066	config_packet p = (config_packet ) pkt;
782		1067
783	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
784	{
785	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
786	conf->nodename, (const char *)rsi);
787	connectmode = conf_node::C_DISABLED;
788	}
789	else if (connectmode == conf_node::C_ALWAYS)
790	establish_connection ();	1069	establish_connection ();
791	}	1070	}
792	break;	1071	break;
793		1072
794	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
795	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
796	{	1075	{
797	auth_req_packet p = (auth_req_packet ) pkt;	1076	auth_req_packet p = (auth_req_packet )pkt;
798		1077
799	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
800		1081
801	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
802	{	1088	{
803	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
804	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
805	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
806	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
807		1093
808	if (p->initiate)	1094	if (p->initiate)
809	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
810		1096
811	rsachallenge k;	1097	auth_data auth;
812		1098
813	if (0 > RSA_private_decrypt (sizeof (p->encr),	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
814	(unsigned char )&p->encr, (unsigned char )&k,	1100	{
815	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
816	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1101	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
817	conf->nodename, (const char *)rsi);	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1103	}
818	else	1104	else
819	{	1105	{
820	retry_cnt = 0;	1106	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
821	establish_connection.start (NOW + 8); //? ;)
822	keepalive.reset ();
823	rekey.reset ();
824		1107
825	delete ictx;
826	ictx = 0;	1108	rcv_auth = auth;
		1109	have_rcv_auth = true;
827		1110
828	delete octx;	1111	send_auth_response (rsi);
829		1112
830	octx = new crypto_ctx (k, 1);	1113	if (chg)
831	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1114	{
832
833	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
834	send_auth_response (rsi, p->id, k);	1116	features = p->features & config_packet::get_features ();
835		1117
		1118	connection_established (rsi);
836	break;	1119	}
837	}	1120	}
		1121
		1122	break;
838	}	1123	}
839		1124
840	send_reset (rsi);	1125	send_reset (rsi);
841	}	1126	}
842		1127
843	break;	1128	break;
844		1129
845	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
846	{	1131	{
847	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
848		1133
849	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
850		1135
851	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
852	{	1140	{
853	if (p->prot_minor != PROTOCOL_MINOR)
854	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
855	conf->nodename, (const char *)rsi,
856	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
857
858	rsachallenge chg;
859
860	if (!rsa_cache.find (p->id, chg))
861	slog (L_ERR, _("%s(%s): unrequested auth response"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
862	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
863	else
864	{
865	crypto_ctx *cctx = new crypto_ctx (chg, 0);
866
867	if (!p->hmac_chk (cctx))
868	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
869	"could be an attack, or just corruption or an synchronization error"),
870	conf->nodename, (const char *)rsi);
871	else
872	{
873	rsaresponse h;
874
875	rsa_hash (p->id, chg, h);
876
877	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
878	{
879	prot_minor = p->prot_minor;
880
881	delete ictx; ictx = cctx;
882
883	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
884
885	si = rsi;
886	protocol = rsi.prot;
887
888	rekey.start (NOW + ::conf.rekey);
889	keepalive.start (NOW + ::conf.keepalive);
890
891	// send queued packets
892	while (tap_packet *p = queue.get ())
893	{
894	send_data_packet (p);
895	delete p;
896	}
897
898	connectmode = conf->connectmode;
899
900	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
901	conf->nodename, (const char *)rsi,
902	p->prot_major, p->prot_minor);
903
904	if (::conf.script_node_up)
905	run_script (run_script_cb (this, &connection::script_node_up), false);
906
907	break;
908	}
909	else
910	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
911	conf->nodename, (const char *)rsi);
912	}
913
914	delete cctx;
915	}
916	}	1143	}
		1144	else if (!have_snd_auth)
		1145	{
		1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1147
		1148	have_snd_auth = true;
		1149	connection_established (rsi);
		1150	}
		1151
		1152	break;
917	}	1153	}
918		1154
919	send_reset (rsi);	1155	send_reset (rsi);
920	break;	1156	break;
921		1157
…		…
929		1165
930	if (ictx && octx)	1166	if (ictx && octx)
931	{	1167	{
932	vpndata_packet p = (vpndata_packet )pkt;	1168	vpndata_packet p = (vpndata_packet )pkt;
933		1169
934	if (rsi == si)	1170	if (!p->hmac_chk (ictx))
		1171	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
		1172	"could be an attack, or just corruption or a synchronization error."),
		1173	conf->nodename, (const char *)rsi);
		1174	else
935	{	1175	{
936	if (!p->hmac_chk (ictx))
937	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
938	"could be an attack, or just corruption or an synchronization error"),
939	conf->nodename, (const char *)rsi);
940	else	1176	u32 seqno;
		1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
		1179
		1180	if (seqclass == 0) // ok
941	{	1181	{
942	u32 seqno;	1182	vpn->tap->send (d);
943	tap_packet *d = p->unpack (this, seqno);
944		1183
945	if (iseqno.recv_ok (seqno))	1184	if (si != rsi)
946	{	1185	{
947	vpn->tap->send (d);	1186	// fast re-sync on source address changes, useful especially for tcp/ip
		1187	//if (last_si_change < ev_now () + 5.)
		1188	// {
		1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
		1190	conf->nodename, (const char )si, (const char )rsi);
948		1191
949	if (p->dst () == 0) // re-broadcast	1192	si = rsi;
950	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)	1193
		1194	if (::conf.script_node_change)
951	{	1195	{
952	connection c = i;	1196	run_script_cb *cb = new run_script_cb;
953		1197	cb->set<connection, &connection::script_node_change> (this);
954	if (c->conf != THISNODE && c->conf != conf)	1198	run_script_queued (cb, _("node-change command execution failed, continuing."));
955	c->inject_data_packet (d);
956	}	1199	}
957		1200
		1201	// }
958	delete d;	1202	//else
959		1203	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
960	break;	1204	// conf->nodename, (const char )si, (const char )rsi);
961	}	1205	}
962	}	1206	}
		1207	else if (seqclass == 1) // far history
		1208	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1209	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1210	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1211	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 3) // reset
		1214	{
		1215	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1216	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1217	send_reset (rsi);
		1218	}
		1219
		1220	delete d;
		1221	break;
963	}	1222	}
964	else
965	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
966	}	1223	}
967		1224
968	send_reset (rsi);	1225	send_reset (rsi);
969	break;	1226	break;
970		1227
971	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
972	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
973	{	1230	{
974	connect_req_packet p = (connect_req_packet ) pkt;	1231	connect_req_packet p = (connect_req_packet )pkt;
975		1232
976	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1233	if (p->id > 0 && p->id <= vpn->conns.size ())
977	connection *c = vpn->conns[p->id - 1];
978	conf->protocols = p->protocols;
979
980	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
981	conf->id, p->id, c->ictx && c->octx);
982
983	if (c->ictx && c->octx)
984	{	1234	{
		1235	connection *c = vpn->conns[p->id - 1];
		1236	conf->protocols = p->protocols;
		1237
		1238	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1239	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1240	p->protocols,
		1241	c->ictx && c->octx);
		1242
		1243	if (c->ictx && c->octx)
		1244	{
985	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
986	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
987	c->send_connect_info (conf->id, si, conf->protocols);	1247	c->send_connect_info (conf->id, si, conf->protocols);
988	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1248	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1249	}
		1250	else
		1251	c->establish_connection ();
989	}	1252	}
		1253	else
		1254	slog (L_WARN,
		1255	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1256	p->id);
990	}	1257	}
991		1258
992	break;	1259	break;
993		1260
994	case vpn_packet::PT_CONNECT_INFO:	1261	case vpn_packet::PT_CONNECT_INFO:
995	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1262	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
996	{	1263	{
997	connect_info_packet p = (connect_info_packet ) pkt;	1264	connect_info_packet p = (connect_info_packet )pkt;
998		1265
999	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1266	if (p->id > 0 && p->id <= vpn->conns.size ())
1000		1267	{
1001	connection *c = vpn->conns[p->id - 1];	1268	connection *c = vpn->conns[p->id - 1];
1002		1269
1003	c->conf->protocols = p->protocols;	1270	c->conf->protocols = p->protocols;
1004	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1271	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1005	p->si.upgrade_protocol (protocol, c->conf);	1272	p->si.upgrade_protocol (protocol, c->conf);
1006		1273
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1274	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1275	conf->nodename,
1009	//slog (L_ERR, "%d PROTOCL(C%x,T%x,0S%x,S%x,P%x,SP%x)",	1276	vpn->conns[p->id - 1]->conf->nodename,
1010	// p->id, c->conf->protocols, THISNODE->protocols, p->si.supported_protocols(0), p->si.supported_protocols (c->conf),	1277	(const char *)p->si,
1011	// protocol, p->si.prot);	1278	p->protocols,
		1279	protocol,
		1280	p->si.supported_protocols (c->conf),
		1281	!c->ictx && !c->octx);
1012		1282
		1283	const sockinfo &dsi = forward_si (p->si);
		1284
		1285	if (dsi.valid ())
1013	c->send_auth_request (p->si, true);	1286	c->send_auth_request (dsi, true);
		1287	else
		1288	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si);
		1291	}
		1292	else
		1293	slog (L_WARN,
		1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1295	p->id);
1014	}	1296	}
1015		1297
1016	break;	1298	break;
1017		1299
1018	default:	1300	default:
1019	send_reset (rsi);	1301	send_reset (rsi);
1020	break;	1302	break;
1021	}	1303	}
1022	}	1304	}
1023		1305
1024	void connection::keepalive_cb (time_watcher &w)	1306	inline void
		1307	connection::keepalive_cb (ev::timer &w, int revents)
1025	{	1308	{
1026	if (NOW >= last_activity + ::conf.keepalive + 30)	1309	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1310
		1311	if (when >= 0)
		1312	w.start (when);
		1313	else if (when < -15)
1027	{	1314	{
1028	reset_connection ();	1315	reset_connection ();
1029	establish_connection ();	1316	establish_connection ();
1030	}	1317	}
1031	else if (NOW < last_activity + ::conf.keepalive)
1032	w.at = last_activity + ::conf.keepalive;
1033	else if (conf->connectmode != conf_node::C_ONDEMAND	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1034	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1035	{	1320	{
		1321	w.start (3);
1036	send_ping (si);	1322	send_ping (si);
1037	w.at = NOW + 5;
1038	}	1323	}
		1324	else if (when >= -10)
		1325	// hold ondemand connections implicitly a few seconds longer
		1326	// should delete octx, though, or something like that ;)
		1327	w.start (when + 10);
1039	else	1328	else
1040	reset_connection ();	1329	reset_connection ();
1041	}	1330	}
1042		1331
		1332	void
1043	void connection::connect_request (int id)	1333	connection::send_connect_request (int id)
1044	{	1334	{
1045	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1335	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1046		1336
1047	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1337	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1338	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1339	THISNODE->protocols);
1048	p->hmac_set (octx);	1340	p->hmac_set (octx);
1049	vpn->send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1050		1342
1051	delete p;	1343	delete p;
1052	}	1344	}
1053		1345
1054	void connection::script_node ()	1346	void
		1347	connection::script_init_env (const char *ext)
1055	{	1348	{
1056	vpn->script_if_up ();
1057
1058	char *env;	1349	char *env;
		1350	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1351	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1352	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1353	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1354	conf->id & 0xff); putenv (env);
		1355	}
		1356
		1357	void
		1358	connection::script_init_connect_env ()
		1359	{
		1360	vpn->script_init_env ();
		1361
		1362	char *env;
1059	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1363	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1364	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1060	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1061	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1062	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1063	}	1368	}
1064		1369
		1370	inline const char *
1065	const char *connection::script_node_up ()	1371	connection::script_node_up ()
1066	{	1372	{
1067	script_node ();	1373	script_init_connect_env ();
1068		1374
1069	putenv ("STATE=up");	1375	putenv ((char *)"STATE=up");
1070		1376
		1377	char *filename;
		1378	asprintf (&filename,
		1379	"%s/%s",
		1380	confbase,
1071	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1381	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1072	}
1073		1382
		1383	return filename;
		1384	}
		1385
		1386	inline const char *
		1387	connection::script_node_change ()
		1388	{
		1389	script_init_connect_env ();
		1390
		1391	putenv ((char *)"STATE=change");
		1392
		1393	char *filename;
		1394	asprintf (&filename,
		1395	"%s/%s",
		1396	confbase,
		1397	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1398
		1399	return filename;
		1400	}
		1401
		1402	inline const char *
1074	const char *connection::script_node_down ()	1403	connection::script_node_down ()
1075	{	1404	{
1076	script_node ();	1405	script_init_connect_env ();
1077		1406
1078	putenv ("STATE=down");	1407	putenv ((char *)"STATE=down");
1079		1408
1080	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1409	char *filename;
1081	}	1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1082		1414
		1415	return filename;
		1416	}
		1417
1083	connection::connection(struct vpn *vpn_)	1418	connection::connection (struct vpn vpn, conf_node conf)
1084	: vpn(vpn_)	1419	: vpn(vpn), conf(conf),
1085	, rekey (this, &connection::rekey_cb)	1420	#if ENABLE_DNS
1086	, keepalive (this, &connection::keepalive_cb)	1421	dns (0),
		1422	#endif
		1423	data_queue(conf->max_ttl, conf->max_queue + 1),
		1424	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1425	{
		1426	rekey .set<connection, &connection::rekey_cb > (this);
		1427	keepalive .set<connection, &connection::keepalive_cb > (this);
1087	, establish_connection (this, &connection::establish_connection_cb)	1428	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1088	{	1429
		1430	last_establish_attempt = 0.;
1089	octx = ictx = 0;	1431	octx = ictx = 0;
1090	retry_cnt = 0;
1091		1432
1092	connectmode = conf_node::C_ALWAYS; // initial setting	1433	connectmode = conf->connectmode;
		1434
		1435	// queue a dummy packet to force an initial connection attempt
		1436	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1437	vpn_queue.put (new net_packet);
		1438
1093	reset_connection ();	1439	reset_connection ();
1094	}	1440	}
1095		1441
1096	connection::~connection ()	1442	connection::~connection ()
1097	{	1443	{
1098	shutdown ();	1444	shutdown ();
1099	}	1445	}
1100		1446
		1447	void
1101	void connection_init ()	1448	connection_init ()
1102	{	1449	{
1103	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1104	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1105	}	1452	}
1106		1453

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Comparing gvpe/src/connection.C (file contents): Revision 1.7 by pcg, Sat Apr 5 17:54:22 2003 UTC vs. Revision 1.104 by root, Fri Jul 19 18:18:27 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.7 by pcg, Sat Apr 5 17:54:22 2003 UTC vs.
Revision 1.104 by root, Fri Jul 19 18:18:27 2013 UTC