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

Comparing gvpe/src/connection.C (file contents):
Revision 1.14 by pcg, Fri Aug 8 09:29:22 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 (net_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	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;	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. / 180.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // 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
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		301
207	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	303	bool can (u32 host);
209	};	304	};
210		305
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		307
		308	bool
213	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
214	{	310	{
215	iterator i;	311	iterator i;
216		312
217	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
218	if (i->host == host)	314	if (i->host == host)
219	break;	315	break;
220	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	317	i = erase (i);
222	else	318	else
223	i++;	319	i++;
224		320
225	if (i == end ())	321	if (i == end ())
226	{	322	{
227	net_rateinfo ri;	323	net_rateinfo ri;
228		324
229	ri.host = host;	325	ri.host = host;
230	ri.pcnt = 1.;	326	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	327	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	328	ri.last = ev_now ();
233		329
234	push_front (ri);	330	push_front (ri);
235		331
236	return true;	332	return true;
237	}	333	}
238	else	334	else
239	{	335	{
240	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
241	erase (i);	337	erase (i);
242		338
243	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		341
246	ri.last = NOW;	342	ri.last = ev_now ();
247		343
248	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
249		345
250	bool send = dif > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
251		347
252	if (dif > MAXDIF)	348	if (dif > NRL_MAXDIF)
253	{	349	{
254	ri.pcnt = 1.;	350	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	351	ri.diff = NRL_MAXDIF;
256	}	352	}
257	else if (send)	353	else if (send)
258	ri.pcnt++;	354	ri.pcnt++;
259		355
260	push_front (ri);	356	push_front (ri);
263	}	359	}
264	}	360	}
265		361
266	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
267		363
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
269
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
271	{	366	{
272	unsigned int xlen;
273
274	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
275		368
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
278	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
280	}	372	}
281		373
282	void	374	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	376	{
285	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
286		378	hmac_gen (ctx, hmac_digest);
287	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
288	}	380	}
289		381
290	bool	382	bool
291	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
292	{	384	{
293	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
294		386	hmac_gen (ctx, hmac_digest);
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	388	}
297		389
		390	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	392	{
300	type = type_;	393	type = type_;
301		394
302	int src = THISNODE->id;	395	int src = THISNODE->id;
303		396
…		…
307	}	400	}
308		401
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		404
312	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
313	{	414	{
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;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	416	}
		417	};
325		418
326	void	419	void
327	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)
328	{	421	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	423	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
332		425
333	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
335	u32 cl;
336		428
		429	if (conn->features & FEATURE_COMPRESSION)
		430	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		432
338	if (cl)	433	if (cl)
339	{	434	{
340	type = PT_DATA_COMPRESSED;	435	type = PT_DATA_COMPRESSED;
341	d = cdata;	436	d = cdata;
342	l = cl + 2;	437	l = cl + 2;
343		438
344	d[0] = cl >> 8;	439	d[0] = cl >> 8;
345	d[1] = cl;	440	d[1] = cl;
		441	}
346	}	442	}
347	#endif	443	#endif
348		444
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		446
351	struct {	447	struct {
352	#if RAND_SIZE	448	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
354	#endif	450	#endif
355	u32 seqno;	451	u32 seqno;
356	} datahdr;	452	} datahdr;
357		453
358	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	455	#if RAND_SIZE
360	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);
361	#endif	459	#endif
362		460
363	EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	463	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	464	outl += outl2;
367		465
368	EVP_EncryptUpdate (cctx,	466	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	467	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	468	(unsigned char *) d, l));
371	outl += outl2;	469	outl += outl2;
372		470
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	471	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	472	outl += outl2;
375		473
376	len = outl + data_hdr_size ();	474	len = outl + data_hdr_size ();
377		475
378	set_hdr (type, dst);	476	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	485	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
389	u8 *d;	487	u8 *d;
390	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
391		489
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		491
394	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
396		494
397	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	496	d = cdata;
399	else	497	else
400	#endif	498	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
402		500
403	/* 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
404	EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	509	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	510	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	511	outl += outl2;
408		512
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	513	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	514	outl += outl2;
411		515
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	516	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		517
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	543	}
440	};	544	};
441		545
442	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
443	{	547	{
444	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
450		552
451	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 ()
452	{	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
453	return 0x80	568	return f;
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	569	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	570	};
460		571
		572	void
461	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
462	{	574	{
463	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	578	flags = 0;
467	flags = curflags ();	579	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	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 ()));
473		586
474	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	588	set_hdr (type, dst);
476	}	589	}
477		590
478	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	593	{
480	return prot_major == PROTOCOL_MAJOR	594	if (prot_major != PROTOCOL_MAJOR)
481	&& randsize == RAND_SIZE	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
482	&& hmaclen == HMACLENGTH	596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
483	&& flags == curflags ()	597	else if (randsize != RAND_SIZE)
484	&& 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);
485	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	600	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
486	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
487	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	602	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
488	}	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));
489		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
490	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
491	{	624	{
492	char magic[8];	625	char magic[8];
493	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
494	u8 protocols; // supported protocols (will get patches on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
495	u8 pad2, pad3;	628	u8 pad2, pad3;
496	rsaid id;	629	auth_encr encr;
497	rsaencrdata encr;
498		630
499	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
500	{	632	{
501	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
502	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
503	initiate = !!initiate_;	635	initiate = !!initiate_;
504	protocols = protocols_;	636	protocols = protocols_;
505		637
506	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
507	}	639	}
508	};	640	};
509		641
510	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
511	{	643	{
512	rsaid id;
513	u8 pad1, pad2, pad3;
514	u8 response_len; // encrypted length
515	rsaresponse response;	644	auth_response response;
516		645
517	auth_res_packet (int dst)	646	auth_res_packet (int dst)
518	{	647	{
519	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
520		649
521	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
522	}	651	}
523	};	652	};
524		653
…		…
554	};	683	};
555		684
556	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
557		686
558	void	687	void
559	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
560	{	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
561	if (ictx && octx)	723	if (ictx && octx)
562	{	724	{
563	connectmode = conf->connectmode;	725	while (tap_packet p = (tap_packet )data_queue.get ())
564
565	rekey.start (NOW + ::conf.rekey);
566	keepalive.start (NOW + ::conf.keepalive);
567
568	// send queued packets
569	if (ictx && octx)
570	{	726	{
571	while (tap_packet p = (tap_packet )data_queue.get ())
572	{
573	send_data_packet (p);	727	if (p->len) send_data_packet (p);
574	delete p;	728	delete p;
575	}
576
577	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
578	{
579	send_vpn_packet (p, si, IPTOS_RELIABILITY);
580	delete p;
581	}
582	}	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	}
583	}	736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
		742	connection::reset_si ()
		743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
584	else	746	else
585	{	747	{
586	retry_cnt = 0;	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
587	establish_connection.start (NOW + 5);	749	protocol = 0;
588	keepalive.reset ();
589	rekey.reset ();
590	}	750	}
591	}
592
593	void
594	connection::reset_si ()
595	{
596	protocol = best_protocol (THISNODE->protocols & conf->protocols);
597
598	// mask out protocols we cannot establish
599	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
600	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
601		751
602	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
603	}	755	}
604		756
605	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
606	const sockinfo &	758	const sockinfo &
607	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
608	{	760	{
609	if (!si.valid ())	761	if (!si.valid ())
610	{	762	{
611	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
612		764
613	if (r)	765	if (r)
614	{	766	{
615	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
616	conf->nodename, r->conf->nodename);	768	conf->nodename, r->conf->nodename);
617	return r->si;	769	return r->si;
618	}	770	}
619	else	771	else
620	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
621	conf->nodename);	773	conf->nodename);
622	}	774	}
623		775
624	return si;	776	return si;
625	}	777	}
…		…
635	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
636	{	788	{
637	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
638		790
639	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	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);
640	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
641		795
642	delete pkt;	796	delete pkt;
643	}	797	}
644		798
…		…
659	void	813	void
660	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
661	{	815	{
662	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
663		817
664	rsachallenge chg;	818	generate_auth_data ();
		819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
665		820
666	rsa_cache.gen (pkt->id, chg);
667
668	if (0 > RSA_public_encrypt (sizeof chg,
669	(unsigned char )&chg, (unsigned char )&pkt->encr,
670	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
671	fatal ("RSA_public_encrypt error");
672
673	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	821	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
674
675	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
676		823
677	delete pkt;	824	delete pkt;
678	}	825	}
679		826
680	void	827	void
681	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
682	{	829	{
683	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
684		831
685	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
686		834
687	rsa_hash (id, chg, pkt->response);
688
689	pkt->hmac_set (octx);
690
691	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	835	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
692
693	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
694		837
695	delete pkt;	838	delete pkt;
696	}	839	}
697		840
698	void	841	void
699	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
700	{	843	{
701	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
702	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
703		847
704	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
705		849
706	r->hmac_set (octx);	850	r->hmac_set (octx);
707	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
708		852
709	delete r;	853	delete r;
710	}	854	}
711		855
712	void	856	inline void
713	connection::establish_connection_cb (time_watcher &w)	857	connection::establish_connection_cb (ev::timer &w, int revents)
714	{	858	{
715	if (ictx \|\| conf == THISNODE	859	if (!(ictx && octx)
		860	&& conf != THISNODE
716	\|\| connectmode == conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
717	\|\| connectmode == conf_node::C_DISABLED)	862	&& connectmode != conf_node::C_DISABLED
718	w.at = TSTAMP_CANCEL;	863	&& !w.is_active ())
719	else if (w.at <= NOW)
720	{	864	{
721	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	865	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
722		866	// and stop trying. should probably be handled by a per-connection expire handler.
723	if (retry_int < 3600 * 8)	867	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		868	{
		869	reset_connection ();
724	retry_cnt++;	870	return;
		871	}
725		872
726	w.at = NOW + retry_int;	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));
727		878
728	reset_si ();	879	reset_si ();
729		880
730	if (si.prot && !si.host)	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);
731	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
		888	}
732	else	889	else
733	{	890	{
		891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
		894
734	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
		896
		897	slow = slow \|\| (dsi.prot & PROT_SLOW);
735		898
736	if (dsi.valid () && auth_rate_limiter.can (dsi))	899	if (dsi.valid () && auth_rate_limiter.can (dsi))
737	{	900	{
738	if (retry_cnt < 4)	901	if (retry_cnt < 4)
739	send_auth_request (dsi, true);	902	send_auth_request (dsi, true);
740	else	903	else
741	send_ping (dsi, 0);	904	send_ping (dsi, 0);
742	}	905	}
743	}	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);
744	}	916	}
745	}	917	}
746		918
747	void	919	void
748	connection::reset_connection ()	920	connection::reset_connection ()
…		…
751	{	923	{
752	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
753	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
754		926
755	if (::conf.script_node_down)	927	if (::conf.script_node_down)
756	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	}
757	}	933	}
758		934
759	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
760	delete octx; octx = 0;	936	delete octx; octx = 0;
761		937
762	si.host= 0;	938	si.host = 0;
763		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
764	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
765	retry_cnt = 0;	946	retry_cnt = 0;
766		947
767	rekey.reset ();	948	rekey.stop ();
768	keepalive.reset ();	949	keepalive.stop ();
769	establish_connection.reset ();	950	establish_connection.stop ();
770	}	951	}
771		952
772	void	953	void
773	connection::shutdown ()	954	connection::shutdown ()
774	{	955	{
…		…
776	send_reset (si);	957	send_reset (si);
777		958
778	reset_connection ();	959	reset_connection ();
779	}	960	}
780		961
781	void	962	// poor-man's rekeying
782	connection::rekey_cb (time_watcher &w)	963	inline void
		964	connection::rekey_cb (ev::timer &w, int revents)
783	{	965	{
784	w.at = TSTAMP_CANCEL;
785
786	reset_connection ();	966	reset_connection ();
787	establish_connection ();	967	establish_connection ();
788	}	968	}
789		969
790	void	970	void
791	connection::send_data_packet (tap_packet *pkt, bool broadcast)	971	connection::send_data_packet (tap_packet *pkt)
792	{	972	{
793	vpndata_packet *p = new vpndata_packet;	973	vpndata_packet *p = new vpndata_packet;
794	int tos = 0;	974	int tos = 0;
795		975
796	// I am not hilarious about peeking into packets, but so be it.	976	// I am not hilarious about peeking into packets, but so be it.
797	if (conf->inherit_tos	977	if (conf->inherit_tos && pkt->is_ipv4 ())
798	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
799	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
800	tos = (*pkt)[15] & IPTOS_TOS_MASK;	978	tos = (*pkt)[15] & IPTOS_TOS_MASK;
801		979
802	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
803	send_vpn_packet (p, si, tos);	981	send_vpn_packet (p, si, tos);
804		982
805	delete p;	983	delete p;
806		984
807	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
808	rekey ();	986	rekey ();
809	}	987	}
810		988
811	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
812	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1000	connection::inject_data_packet (tap_packet *pkt)
813	{	1001	{
814	if (ictx && octx)	1002	if (ictx && octx)
815	send_data_packet (pkt, broadcast);	1003	send_data_packet (pkt);
816	else	1004	else
817	{	1005	{
818	if (!broadcast)//DDDD
819	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
820		1007	post_inject_queue ();
821	establish_connection ();
822	}	1008	}
823	}	1009	}
824		1010
		1011	void
825	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
826	{	1013	{
827	if (ictx && octx)	1014	if (ictx && octx)
828	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
829	else	1016	else
830	{	1017	{
831	vpn_queue.put (new vpn_packet (*pkt));	1018	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
832		1019	post_inject_queue ();
833	establish_connection ();
834	}	1020	}
835	}	1021	}
836		1022
837	void	1023	void
838	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
839	{	1025	{
840	last_activity = NOW;	1026	last_activity = ev_now ();
841		1027
842	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.",
843	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;
844		1033
845	switch (pkt->typ ())	1034	switch (pkt->typ ())
846	{	1035	{
847	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
848	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
849	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
850	// when we receive a ping.	1041	// when we receive a ping.
851	if (!ictx)	1042	if (!ictx)
852	{	1043	{
853	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
854	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
855	}	1046	}
856	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.
857	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
858		1051
859	break;	1052	break;
860		1053
861	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 ();
862	break;	1060	break;
863		1061
864	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
865	{	1063	{
866	reset_connection ();	1064	reset_connection ();
867		1065
868	config_packet p = (config_packet ) pkt;	1066	config_packet p = (config_packet ) pkt;
869		1067
870	if (!p->chk_config ())	1068	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
871	{
872	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
873	conf->nodename, (const char *)rsi);
874	connectmode = conf_node::C_DISABLED;
875	}
876	else if (connectmode == conf_node::C_ALWAYS)
877	establish_connection ();	1069	establish_connection ();
878	}	1070	}
879	break;	1071	break;
880		1072
881	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
882	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
883	{	1075	{
884	auth_req_packet p = (auth_req_packet ) pkt;	1076	auth_req_packet p = (auth_req_packet )pkt;
885		1077
886	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);
887		1081
888	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))
889	{	1088	{
890	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
891	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."),
892	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
893	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
894		1093
895	if (p->initiate)	1094	if (p->initiate)
896	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
897		1096
898	rsachallenge k;	1097	auth_data auth;
899		1098
900	if (0 > RSA_private_decrypt (sizeof (p->encr),	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
901	(unsigned char )&p->encr, (unsigned char )&k,	1100	{
902	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
903	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?"),
904	conf->nodename, (const char *)rsi);	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1103	}
905	else	1104	else
906	{	1105	{
907	delete octx;	1106	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
908		1107
909	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
910	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
911		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
912	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
		1116	features = p->features & config_packet::get_features ();
913		1117
914	send_auth_response (rsi, p->id, k);
915
916	connection_established ();	1118	connection_established (rsi);
917
918	break;	1119	}
919	}	1120	}
		1121
		1122	break;
920	}	1123	}
921		1124
922	send_reset (rsi);	1125	send_reset (rsi);
923	}	1126	}
924		1127
925	break;	1128	break;
926		1129
927	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
928	{	1131	{
929	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
930		1133
931	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
932		1135
933	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))
934	{	1140	{
935	if (p->prot_minor != PROTOCOL_MINOR)
936	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
937	conf->nodename, (const char *)rsi,
938	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
939
940	rsachallenge chg;
941
942	if (!rsa_cache.find (p->id, chg))
943	{
944	slog (L_ERR, _("%s(%s): unrequested auth response"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
945	conf->nodename, (const char *)rsi);	1142	conf->nodename, (const char *)rsi);
946	break;
947	}
948	else
949	{
950	crypto_ctx *cctx = new crypto_ctx (chg, 0);
951
952	if (!p->hmac_chk (cctx))
953	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
954	"could be an attack, or just corruption or an synchronization error"),
955	conf->nodename, (const char *)rsi);
956	else
957	{
958	rsaresponse h;
959
960	rsa_hash (p->id, chg, h);
961
962	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
963	{
964	prot_minor = p->prot_minor;
965
966	delete ictx; ictx = cctx;
967
968	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
969
970	si = rsi;
971	protocol = rsi.prot;
972
973	connection_established ();
974
975	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
976	conf->nodename, (const char *)rsi,
977	p->prot_major, p->prot_minor);
978
979	if (::conf.script_node_up)
980	run_script (run_script_cb (this, &connection::script_node_up), false);
981
982	break;
983	}
984	else
985	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
986	conf->nodename, (const char *)rsi);
987	}
988
989	delete cctx;
990	}
991	}	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;
992	}	1153	}
993		1154
994	send_reset (rsi);	1155	send_reset (rsi);
995	break;	1156	break;
996		1157
…		…
1006	{	1167	{
1007	vpndata_packet p = (vpndata_packet )pkt;	1168	vpndata_packet p = (vpndata_packet )pkt;
1008		1169
1009	if (!p->hmac_chk (ictx))	1170	if (!p->hmac_chk (ictx))
1010	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1171	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1011	"could be an attack, or just corruption or an synchronization error"),	1172	"could be an attack, or just corruption or a synchronization error."),
1012	conf->nodename, (const char *)rsi);	1173	conf->nodename, (const char *)rsi);
1013	else	1174	else
1014	{	1175	{
1015	u32 seqno;	1176	u32 seqno;
1016	tap_packet *d = p->unpack (this, seqno);	1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
1017		1179
1018	if (iseqno.recv_ok (seqno))	1180	if (seqclass == 0) // ok
1019	{	1181	{
1020	vpn->tap->send (d);	1182	vpn->tap->send (d);
1021		1183
1022	if (p->dst () == 0) // re-broadcast
1023	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1024	{
1025	connection c = i;
1026
1027	if (c->conf != THISNODE && c->conf != conf)
1028	c->inject_data_packet (d);
1029	}
1030
1031	if (si != rsi)	1184	if (si != rsi)
1032	{	1185	{
1033	// fast re-sync on connection changes, useful especially for tcp/ip	1186	// fast re-sync on source address changes, useful especially for tcp/ip
		1187	//if (last_si_change < ev_now () + 5.)
1034	si = rsi;	1188	// {
1035
1036	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1037	conf->nodename, (const char )si, (const char )rsi);	1190	conf->nodename, (const char )si, (const char )rsi);
		1191
		1192	si = rsi;
		1193
		1194	if (::conf.script_node_change)
		1195	{
		1196	run_script_cb *cb = new run_script_cb;
		1197	cb->set<connection, &connection::script_node_change> (this);
		1198	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1199	}
		1200
		1201	// }
		1202	//else
		1203	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1204	// conf->nodename, (const char )si, (const char )rsi);
1038	}	1205	}
1039
1040	delete d;
1041
1042	break;
1043	}	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;
1044	}	1222	}
1045	}	1223	}
1046		1224
1047	send_reset (rsi);	1225	send_reset (rsi);
1048	break;	1226	break;
1049		1227
1050	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
1051	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1052	{	1230	{
1053	connect_req_packet p = (connect_req_packet ) pkt;	1231	connect_req_packet p = (connect_req_packet )pkt;
1054		1232
1055	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 ())
1056	connection *c = vpn->conns[p->id - 1];
1057	conf->protocols = p->protocols;
1058
1059	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1060	conf->id, p->id, c->ictx && c->octx);
1061
1062	if (c->ictx && c->octx)
1063	{	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	{
1064	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
1065	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
1066	c->send_connect_info (conf->id, si, conf->protocols);	1247	c->send_connect_info (conf->id, si, conf->protocols);
1067	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 ();
1068	}	1252	}
1069	else	1253	else
1070	c->establish_connection ();	1254	slog (L_WARN,
		1255	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1256	p->id);
1071	}	1257	}
1072		1258
1073	break;	1259	break;
1074		1260
1075	case vpn_packet::PT_CONNECT_INFO:	1261	case vpn_packet::PT_CONNECT_INFO:
1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1262	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1077	{	1263	{
1078	connect_info_packet p = (connect_info_packet ) pkt;	1264	connect_info_packet p = (connect_info_packet )pkt;
1079		1265
1080	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 ())
1081		1267	{
1082	connection *c = vpn->conns[p->id - 1];	1268	connection *c = vpn->conns[p->id - 1];
1083		1269
1084	c->conf->protocols = p->protocols;	1270	c->conf->protocols = p->protocols;
1085	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));
1086	p->si.upgrade_protocol (protocol, c->conf);	1272	p->si.upgrade_protocol (protocol, c->conf);
1087		1273
1088	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]",
1089	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1275	conf->nodename,
		1276	vpn->conns[p->id - 1]->conf->nodename,
		1277	(const char *)p->si,
		1278	p->protocols,
		1279	protocol,
		1280	p->si.supported_protocols (c->conf),
		1281	!c->ictx && !c->octx);
1090		1282
1091	const sockinfo &dsi = forward_si (p->si);	1283	const sockinfo &dsi = forward_si (p->si);
1092		1284
1093	if (dsi.valid ())	1285	if (dsi.valid ())
1094	c->send_auth_request (dsi, 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);
1095	}	1296	}
1096		1297
1097	break;	1298	break;
1098		1299
1099	default:	1300	default:
1100	send_reset (rsi);	1301	send_reset (rsi);
1101	break;	1302	break;
1102	}	1303	}
1103	}	1304	}
1104		1305
1105	void connection::keepalive_cb (time_watcher &w)	1306	inline void
		1307	connection::keepalive_cb (ev::timer &w, int revents)
1106	{	1308	{
1107	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)
1108	{	1314	{
1109	reset_connection ();	1315	reset_connection ();
1110	establish_connection ();	1316	establish_connection ();
1111	}	1317	}
1112	else if (NOW < last_activity + ::conf.keepalive)
1113	w.at = last_activity + ::conf.keepalive;
1114	else if (conf->connectmode != conf_node::C_ONDEMAND	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1115	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1116	{	1320	{
		1321	w.start (3);
1117	send_ping (si);	1322	send_ping (si);
1118	w.at = NOW + 5;
1119	}	1323	}
1120	else if (NOW < last_activity + ::conf.keepalive + 10)	1324	else if (when >= -10)
1121	// hold ondemand connections implicitly a few seconds longer	1325	// hold ondemand connections implicitly a few seconds longer
1122	// should delete octx, though, or something like that ;)	1326	// should delete octx, though, or something like that ;)
1123	w.at = last_activity + ::conf.keepalive + 10;	1327	w.start (when + 10);
1124	else	1328	else
1125	reset_connection ();	1329	reset_connection ();
1126	}	1330	}
1127		1331
		1332	void
1128	void connection::send_connect_request (int id)	1333	connection::send_connect_request (int id)
1129	{	1334	{
1130	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);
1131		1336
1132	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);
1133	p->hmac_set (octx);	1340	p->hmac_set (octx);
1134	send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1135		1342
1136	delete p;	1343	delete p;
1137	}	1344	}
1138		1345
1139	void connection::script_node ()	1346	void
		1347	connection::script_init_env (const char *ext)
1140	{	1348	{
1141	vpn->script_if_up ();
1142
1143	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;
1144	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);
1145	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1146	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1147	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1148	}	1368	}
1149		1369
		1370	inline const char *
1150	const char *connection::script_node_up ()	1371	connection::script_node_up ()
1151	{	1372	{
1152	script_node ();	1373	script_init_connect_env ();
1153		1374
1154	putenv ("STATE=up");	1375	putenv ((char *)"STATE=up");
1155		1376
		1377	char *filename;
		1378	asprintf (&filename,
		1379	"%s/%s",
		1380	confbase,
1156	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1381	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1157	}
1158		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 *
1159	const char *connection::script_node_down ()	1403	connection::script_node_down ()
1160	{	1404	{
1161	script_node ();	1405	script_init_connect_env ();
1162		1406
1163	putenv ("STATE=down");	1407	putenv ((char *)"STATE=down");
1164		1408
1165	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1409	char *filename;
1166	}	1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
		1413	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1167		1414
		1415	return filename;
		1416	}
		1417
1168	connection::connection(struct vpn *vpn_)	1418	connection::connection (struct vpn vpn, conf_node conf)
1169	: vpn(vpn_)	1419	: vpn(vpn), conf(conf),
1170	, rekey (this, &connection::rekey_cb)	1420	#if ENABLE_DNS
1171	, 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);
1172	, establish_connection (this, &connection::establish_connection_cb)	1428	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1173	{	1429
		1430	last_establish_attempt = 0.;
1174	octx = ictx = 0;	1431	octx = ictx = 0;
1175	retry_cnt = 0;
1176		1432
1177	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
1178	reset_connection ();	1439	reset_connection ();
1179	}	1440	}
1180		1441
1181	connection::~connection ()	1442	connection::~connection ()
1182	{	1443	{
1183	shutdown ();	1444	shutdown ();
1184	}	1445	}
1185		1446
		1447	void
1186	void connection_init ()	1448	connection_init ()
1187	{	1449	{
1188	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1189	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1190	}	1452	}
1191		1453

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Comparing gvpe/src/connection.C (file contents): Revision 1.14 by pcg, Fri Aug 8 09:29:22 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 1.14 by pcg, Fri Aug 8 09:29:22 2003 UTC vs.
Revision 1.104 by root, Fri Jul 19 18:18:27 2013 UTC