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Comparing gvpe/src/connection.C (file contents):
Revision 1.56 by pcg, Fri Jun 3 05:07:31 2005 UTC vs.
Revision 1.109 by root, Fri Oct 11 07:56:07 2013 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	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
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	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
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	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
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <cassert>
25
26	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
27		37
		38	#include <openssl/opensslv.h>
28	#include <openssl/rand.h>	39	#include <openssl/rand.h>
29	#include <openssl/evp.h>	40	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
31	#include <openssl/err.h>	42	#include <openssl/err.h>
		43
		44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
32		50
33	#include "conf.h"	51	#include "conf.h"
34	#include "slog.h"	52	#include "slog.h"
35	#include "device.h"	53	#include "device.h"
36	#include "vpn.h"	54	#include "vpn.h"
37	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
38		57
39	#include "netcompat.h"	58	#include "netcompat.h"
40		59
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
46		62
47	#define ULTRA_FAST 1	63	#define ULTRA_FAST 1
48	#define HLOG 15	64	#define HLOG 15
49	#include "lzf/lzf.h"	65	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	66	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	67	#include "lzf/lzf_d.c"
52		68
		69	//////////////////////////////////////////////////////////////////////////////
		70
		71	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		72	static ev::child rs_child_ev;
		73
		74	namespace
		75	{
		76	void // c++ requires external linkage here, apparently :(
		77	rs_child_cb (ev::child &w, int revents)
		78	{
		79	w.stop ();
		80
		81	if (rs_queue.empty ())
		82	return;
		83
		84	pid_t pid = run_script (*rs_queue.front ().first, false);
		85	if (pid)
		86	{
		87	w.set (pid);
		88	w.start ();
		89	}
		90	else
		91	slog (L_WARN, rs_queue.front ().second);
		92
		93	delete rs_queue.front ().first;
		94	rs_queue.pop ();
		95	}
		96	};
		97
		98	// despite the fancy name, this is quite a hack
		99	static void
		100	run_script_queued (run_script_cb *cb, const char *warnmsg)
		101	{
		102	rs_queue.push (std::make_pair (cb, warnmsg));
		103
		104	if (!rs_child_ev.is_active ())
		105	{
		106	rs_child_ev.set<rs_child_cb> ();
		107	rs_child_ev ();
		108	}
		109	}
		110
		111	//////////////////////////////////////////////////////////////////////////////
		112
53	struct crypto_ctx	113	struct crypto_ctx
54	{	114	{
55	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	116	HMAC_CTX hctx;
57		117
58	crypto_ctx (const rsachallenge &challenge, int enc);	118	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	119	~crypto_ctx ();
60	};	120	};
61		121
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	122	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	123	{
		124	ecdh_key s;
		125
		126	curve25519_combine (a, b, s);
		127
		128	{
		129	u8 mac_key[MAC_KEYSIZE];
		130	static const unsigned char mac_info[] = "gvpe mac key";
		131
		132	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		133	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		134	kdf.extract (s, sizeof (s));
		135	kdf.extract_done (HKDF_PRF_HASH ());
		136	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		137
		138	HMAC_CTX_init (&hctx);
		139	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		140	}
		141
		142	{
		143	u8 cipher_key[CIPHER_KEYSIZE];
		144	static const unsigned char cipher_info[] = "gvpe cipher key";
		145
		146	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		147	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		148	kdf.extract (s, sizeof (s));
		149	kdf.extract_done (HKDF_PRF_HASH ());
		150	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		151
64	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	154	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	155	}
69		156
70	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
71	{	158	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
74	}	161	}
75		162
		163	static inline void
		164	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		165	{
		166	if (RSA_public_encrypt (sizeof (auth.rsa),
		167	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		168	key, RSA_PKCS1_OAEP_PADDING) < 0)
		169	fatal ("RSA_public_encrypt error");
		170
		171	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		172	}
		173
		174	static inline bool
		175	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		176	{
		177	u8 rsa_decrypt[RSA_KEYLEN];
		178
		179	if (RSA_private_decrypt (sizeof (encr.rsa),
		180	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		181	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		182	return 0;
		183
		184	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		185	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		186
		187	return 1;
		188	}
		189
76	static void	190	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	192	{
79	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	197	}
88		198
89	struct rsa_entry {	199	void
90	tstamp expire;	200	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	201	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{	203	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)	204	// request data
104	{	205	rand_fill (snd_auth.rsa);
105	memcpy (&chg, &i->chg, sizeof chg);	206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
106		207
107	erase (i);	208	// eventual response data
108	return true;	209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
109	}
110	}	210	}
111		211
112	if (cleaner.at < NOW)	212	// every use prolongs the expiry
113	cleaner.start (NOW + RSA_TTL);	213	auth_expire = ev_now () + AUTH_TTL;
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }
138
139	} rsa_cache;
140
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{
145	w.start (NOW + RSA_TTL);
146
147	for (iterator i = begin (); i != end (); )
148	if (i->expire <= NOW)
149	i = erase (i);
150	else
151	++i;
152	}
153	}	214	}
154		215
155	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
156		217
157	void pkt_queue::put (net_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
158	{	220	{
159	if (queue[i])	221	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		222
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	223	i = 0;
187	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	227	}
189		228
190	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
191	{	230	{
192	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
193	delete queue[i];	234	delete [] queue;
194	}	235	}
195		236
		237	void
		238	pkt_queue::expire_cb (ev::timer &w, int revents)
		239	{
		240	ev_tstamp expire = ev_now () - max_ttl;
		241
		242	for (;;)
		243	{
		244	if (empty ())
		245	break;
		246
		247	double diff = queue[j].tstamp - expire;
		248
		249	if (diff >= 0.)
		250	{
		251	w.start (diff > 0.5 ? diff : 0.5);
		252	break;
		253	}
		254
		255	delete get ();
		256	}
		257	}
		258
		259	void
		260	pkt_queue::put (net_packet *p)
		261	{
		262	ev_tstamp now = ev_now ();
		263
		264	// start expiry timer
		265	if (empty ())
		266	expire.start (max_ttl);
		267
		268	int ni = i + 1 == max_queue ? 0 : i + 1;
		269
		270	if (ni == j)
		271	delete get ();
		272
		273	queue[i].pkt = p;
		274	queue[i].tstamp = now;
		275
		276	i = ni;
		277	}
		278
		279	net_packet *
		280	pkt_queue::get ()
		281	{
		282	if (empty ())
		283	return 0;
		284
		285	net_packet *p = queue[j].pkt;
		286	queue[j].pkt = 0;
		287
		288	j = j + 1 == max_queue ? 0 : j + 1;
		289
		290	return p;
		291	}
		292
196	struct net_rateinfo {	293	struct net_rateinfo
		294	{
197	u32 host;	295	u32 host;
198	double pcnt, diff;	296	double pcnt, diff;
199	tstamp last;	297	tstamp last;
200	};	298	};
201		299
…		…
211		309
212	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	311	bool can (u32 host);
214	};	312	};
215		313
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		315
		316	bool
218	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
219	{	318	{
220	iterator i;	319	iterator i;
221		320
222	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
223	if (i->host == host)	322	if (i->host == host)
224	break;	323	break;
225	else if (i->last < NOW - NRL_EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	325	i = erase (i);
227	else	326	else
228	i++;	327	i++;
229		328
230	if (i == end ())	329	if (i == end ())
…		…
232	net_rateinfo ri;	331	net_rateinfo ri;
233		332
234	ri.host = host;	333	ri.host = host;
235	ri.pcnt = 1.;	334	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	335	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	336	ri.last = ev_now ();
238		337
239	push_front (ri);	338	push_front (ri);
240		339
241	return true;	340	return true;
242	}	341	}
…		…
244	{	343	{
245	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
246	erase (i);	345	erase (i);
247		346
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		349
251	ri.last = NOW;	350	ri.last = ev_now ();
252		351
253	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
254		353
255	bool send = dif > NRL_CUTOFF;	354	bool send = dif > NRL_CUTOFF;
256		355
…		…
268	}	367	}
269	}	368	}
270		369
271	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
272		371
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	374	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
280		376
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	380	}
286		381
287	void	382	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	384	{
290	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		386	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	388	}
294		389
295	bool	390	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	392	{
298	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		394	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	396	}
302		397
		398	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	400	{
305	type = type_;	401	type = type_;
306		402
307	int src = THISNODE->id;	403	int src = THISNODE->id;
308		404
…		…
313		409
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		412
317	struct vpndata_packet : vpn_packet	413	struct vpndata_packet : vpn_packet
		414	{
		415	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		416
		417	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		418	tap_packet *unpack (connection *conn, u32 &seqno);
		419
		420	private:
		421	const u32 data_hdr_size () const
318	{	422	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
322	tap_packet *unpack (connection *conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	424	}
		425	};
330		426
331	void	427	void
332	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	428	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
333	{	429	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
337		433
338	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
340		436
341	if (conn->features & ENABLE_COMPRESSION)	437	if (conn->features & FEATURE_COMPRESSION)
342	{	438	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		440
345	if (cl)	441	if (cl)
346	{	442	{
…		…
352	d[1] = cl;	448	d[1] = cl;
353	}	449	}
354	}	450	}
355	#endif	451	#endif
356		452
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		454
359	struct {	455	struct {
360	#if RAND_SIZE	456	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
362	#endif	458	#endif
363	u32 seqno;	459	u32 seqno;
364	} datahdr;	460	} datahdr;
365		461
366	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	463	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	464	// NB: a constant (per session) random prefix
		465	// is likely enough, but we don't take any chances.
		466	conn->oiv.get (datahdr.rnd, RAND_SIZE);
369	#endif	467	#endif
370		468
371	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	493	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
397	u8 *d;	495	u8 *d;
398	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
399		497
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		499
402	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
404		502
405	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	504	d = cdata;
407	else	505	else
408	#endif	506	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
410		508
411	/* this overwrites part of the src mac, but we fix that later */	509	// we play do evil games with the struct layout atm.
		510	// pending better solutions, we at least do some verification.
		511	// this is fine, as we left ISO territory long ago.
		512	require (DATAHDR <= 16);
		513	require ((u8 *)(&p->len + 1) == &(*p)[0]);
		514
		515	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	517	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	518	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	519	outl += outl2;
416		520
…		…
447	}	551	}
448	};	552	};
449		553
450	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
451	{	555	{
452	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
458		560
459	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
460	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		563
462	static u8 get_features ()	564	static u8 get_features ()
463	{	565	{
464	u8 f = 0;	566	u8 f = 0;
465	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
466	f |= FEATURE_COMPRESSION;	568	f |= FEATURE_COMPRESSION;
467	#endif	569	#endif
468	#if ENABLE_ROHC	570	#if ENABLE_ROHC
469	f |= FEATURE_ROHC;	571	f |= FEATURE_ROHC;
470	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
471	return f;	576	return f;
472	}	577	}
473	};	578	};
474		579
		580	void
475	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
476	{	582	{
477	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;
481	flags = 0;	586	flags = 0;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	587	features = get_features ();
484		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	592	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		593	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		594
489	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	596	set_hdr (type, dst);
491	}	597	}
492		598
493	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	601	{
495	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
499	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	else if (challengelen != sizeof (rsachallenge))
502	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
503	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
504	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
505	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
506	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
507	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
508	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	612	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		613	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		614	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		615	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		616	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
509	else	617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		620
		621	if (cmp > 0)
		622	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		623	conf->nodename, (const char *)rsi);
		624	else if (cmp == 0)
510	return true;	625	return true;
		626	}
511		627
512	return false;	628	return false;
513	}	629	}
514		630
515	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
516	{	632	{
517	char magic[8];	633	char magic[8];
518	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
519	u8 protocols; // supported protocols (will be patched on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
520	u8 pad2, pad3;	636	u8 pad2, pad3;
521	rsaid id;	637	auth_encr encr;
522	rsaencrdata encr;
523		638
524	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
525	{	640	{
526	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
527	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
528	initiate = !!initiate_;	643	initiate = !!initiate_;
529	protocols = protocols_;	644	protocols = protocols_;
530		645
531	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
532	}	647	}
533	};	648	};
534		649
535	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
536	{	651	{
537	rsaid id;
538	u8 pad1, pad2, pad3;
539	u8 response_len; // encrypted length
540	rsaresponse response;	652	auth_response response;
541		653
542	auth_res_packet (int dst)	654	auth_res_packet (int dst)
543	{	655	{
544	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
545		657
546	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
547	}	659	}
548	};	660	};
549		661
…		…
579	};	691	};
580		692
581	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
582		694
583	void	695	void
584	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
585	{	697	{
586	if (ictx && octx)	698	if (!have_snd_auth || !have_rcv_auth)
		699	return;
		700
		701	si = rsi;
		702	protocol = rsi.prot;
		703
		704	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		705	conf->nodename, (const char *)rsi,
		706	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		707	PROTOCOL_MAJOR, prot_minor);
		708
		709	if (::conf.script_node_up)
		710	{
		711	run_script_cb *cb = new run_script_cb;
		712	cb->set<connection, &connection::script_node_up> (this);
		713	run_script_queued (cb, _("node-up command execution failed, continuing."));
587	{	714	}
588	connectmode = conf->connectmode;	715
		716	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		717	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
589		718
		719	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		720	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		721
		722	oiv.reset ();
		723
590	// make sure rekeying timeouts are slightly asymmetric	724	// make sure rekeying timeouts are slightly asymmetric
591	rekey.start (NOW + ::conf.rekey	725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
592	+ (conf->id > THISNODE->id ? 10 : 0));	726	rekey.start (rekey_interval, rekey_interval);
		727
		728	hmac_error = 0.;
		729
593	keepalive.start (NOW + ::conf.keepalive);	730	keepalive.start (::conf.keepalive);
594		731
595	// send queued packets	732	// send queued packets
596	if (ictx && octx)
597	{
598	while (tap_packet *p = (tap_packet *)data_queue.get ())	733	while (tap_packet *p = (tap_packet *)data_queue.get ())
599	{	734	{
600	send_data_packet (p);	735	if (p->len) send_data_packet (p);
601	delete p;	736	delete p;
602	}	737	}
603		738
604	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	739	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
605	{	740	{
606	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
607	delete p;	742	delete p;
608	}
609	}
610	}	743	}
		744
		745	vpn->connection_established (this);
		746	}
		747
		748	void
		749	connection::reset_si ()
		750	{
		751	if (vpn->can_direct (THISNODE, conf))
		752	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
611	else	753	else
612	{	754	{
613	retry_cnt = 0;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
614	establish_connection.start (NOW + 5);	756	protocol = 0;
615	keepalive.stop ();
616	rekey.stop ();
617	}	757	}
618	}
619
620	void
621	connection::reset_si ()
622	{
623	protocol = best_protocol (THISNODE->protocols & conf->protocols);
624
625	// mask out protocols we cannot establish
626	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
627	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
628	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
629		758
630	si.set (conf, protocol);	759	si.set (conf, protocol);
631	}	760	}
632		761
633	// ensure sockinfo is valid, forward if necessary	762	// ensure sockinfo is valid, forward if necessary
634	const sockinfo &	763	const sockinfo &
635	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
636	{	765	{
637	if (!si.valid ())	766	if (!si.valid ())
638	{	767	{
639	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
640		769
641	if (r)	770	if (r)
642	{	771	{
643	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
644	conf->nodename, r->conf->nodename, (const char *)r->si);	773	conf->nodename, r->conf->nodename);
645	return r->si;	774	return r->si;
646	}	775	}
647	else	776	else
648	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
649	conf->nodename);	778	conf->nodename);
650	}	779	}
651		780
652	return si;	781	return si;
653	}	782	}
654		783
655	void	784	void
656	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	785	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
657	{	786	{
658	if (!vpn->send_vpn_packet (pkt, si, tos))	787	if (!vpn->send_vpn_packet (pkt, si, tos))
659	reset_connection ();	788	reset_connection ("packet send error");
660	}	789	}
661		790
662	void	791	void
663	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
664	{	793	{
665	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
666		795
667	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	796	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		797
		798	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
668	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
669		800
670	delete pkt;	801	delete pkt;
671	}	802	}
672		803
…		…
687	void	818	void
688	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
689	{	820	{
690	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	821	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
691		822
692	rsachallenge chg;	823	generate_auth_data ();
693	rsa_cache.gen (pkt->id, chg);
694	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
695		825
696	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
697
698	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
699		828
700	delete pkt;	829	delete pkt;
701	}	830	}
702		831
703	void	832	void
704	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
705	{	834	{
706	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
707		836
708	pkt->id = id;	837	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		838	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
709		839
710	rsa_hash (id, chg, pkt->response);
711
712	pkt->hmac_set (octx);
713
714	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	840	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
715
716	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	841	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
717		842
718	delete pkt;	843	delete pkt;
719	}	844	}
720		845
721	void	846	void
722	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
723	{	848	{
724	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
725	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
726		852
727	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	853	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
728		854
729	r->hmac_set (octx);	855	r->hmac_set (octx);
730	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
731		857
732	delete r;	858	delete r;
733	}	859	}
734		860
735	void	861	inline void
736	connection::establish_connection_cb (time_watcher &w)	862	connection::establish_connection_cb (ev::timer &w, int revents)
737	{	863	{
738	if (!ictx	864	if (!(ictx && octx)
739	&& conf != THISNODE	865	&& conf != THISNODE
740	&& connectmode != conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
741	&& connectmode != conf_node::C_DISABLED	867	&& connectmode != conf_node::C_DISABLED
742	&& NOW > w.at)	868	&& !w.is_active ())
743	{	869	{
744	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		871	// and stop trying. should probably be handled by a per-connection expire handler.
		872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
		875	return;
		876	}
745		877
746	double retry_int = double (retry_cnt & 3	878	last_establish_attempt = ev_now ();
		879
		880	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
747	? (retry_cnt & 3) + 1	881	? (retry_cnt & 3) + 1
748	: 1 << (retry_cnt >> 2));	882	: 1 << (retry_cnt >> 2));
749		883
750	reset_si ();	884	reset_si ();
751		885
752	bool slow = si.prot & PROT_SLOW;	886	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
753		887
754	if (si.prot && !si.host)	888	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		889	{
		890	/*TODO*/ /* start the timer so we don't recurse endlessly */
		891	w.start (1);
755	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
		893	}
756	else	894	else
757	{	895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
758	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
759		901
760	slow = slow || (dsi.prot & PROT_SLOW);	902	slow = slow || (dsi.prot & PROT_SLOW);
761		903
762	if (dsi.valid () && auth_rate_limiter.can (dsi))	904	if (dsi.valid () && auth_rate_limiter.can (dsi))
763	{	905	{
764	if (retry_cnt < 4)	906	// use ping after the first few retries
		907	// TODO: on rekeys, the other node might not interpret ping correctly,
		908	// TODO: as it will still have a valid connection
		909	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
765	send_auth_request (dsi, true);	910	send_auth_request (dsi, true);
766	else	911	else
767	send_ping (dsi, 0);	912	send_ping (dsi, 0);
768	}	913	}
769	}	914	}
770		915
771	retry_int *= slow ? 8. : 0.7;	916	retry_int *= slow ? 4. : 0.9;
772		917
773	if (retry_int < conf->max_retry)	918	if (retry_int < conf->max_retry)
774	retry_cnt++;	919	retry_cnt++;
775	else	920	else
776	retry_int = conf->max_retry;	921	retry_int = conf->max_retry;
777		922
778	w.start (NOW + retry_int);	923	w.start (retry_int);
779	}	924	}
780	}	925	}
781		926
782	void	927	void
783	connection::reset_connection ()	928	connection::reset_connection (const char *reason)
784	{	929	{
785	if (ictx && octx)	930	if (ictx && octx)
786	{	931	{
787	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost (%s)"),
788	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si, reason);
789		934
790	if (::conf.script_node_down)	935	if (::conf.script_node_down)
791	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	936	{
		937	run_script_cb *cb = new run_script_cb;
		938	cb->set<connection, &connection::script_node_down> (this);
792	slog (L_WARN, _("node-down command execution failed, continuing."));	939	run_script_queued (cb, _("node-down command execution failed, continuing."));
		940	}
793	}	941	}
794		942
795	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
796	delete octx; octx = 0;	944	delete octx; octx = 0;
797	#if ENABLE_DNS
798	dnsv4_reset_connection ();
799	#endif
800		945
801	si.host = 0;	946	si.host = 0;
802		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
803	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
804	retry_cnt = 0;	954	retry_cnt = 0;
805		955
806	rekey.stop ();	956	rekey.stop ();
807	keepalive.stop ();	957	keepalive.stop ();
808	establish_connection.stop ();	958	establish_connection.stop ();
…		…
812	connection::shutdown ()	962	connection::shutdown ()
813	{	963	{
814	if (ictx && octx)	964	if (ictx && octx)
815	send_reset (si);	965	send_reset (si);
816		966
817	reset_connection ();	967	reset_connection ("shutdown");
818	}	968	}
819		969
820	void	970	// poor-man's rekeying
821	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
822	{	973	{
823	reset_connection ();	974	reset_connection ("rekeying");
824	establish_connection ();	975	establish_connection ();
825	}	976	}
826		977
827	void	978	void
828	connection::send_data_packet (tap_packet *pkt)	979	connection::send_data_packet (tap_packet *pkt)
…		…
842	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
843	rekey ();	994	rekey ();
844	}	995	}
845		996
846	void	997	void
		998	connection::post_inject_queue ()
		999	{
		1000	// force a connection every now and when when packets are sent (max 1/s)
		1001	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		1002	establish_connection.stop ();
		1003
		1004	establish_connection ();
		1005	}
		1006
		1007	void
847	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1008	connection::inject_data_packet (tap_packet *pkt)
848	{	1009	{
849	if (ictx && octx)	1010	if (ictx && octx)
850	send_data_packet (pkt);	1011	send_data_packet (pkt);
851	else	1012	else
852	{	1013	{
853	if (!broadcast)
854	data_queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
855		1015	post_inject_queue ();
856	establish_connection ();
857	}	1016	}
858	}	1017	}
859		1018
		1019	void
860	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
861	{	1021	{
862	if (ictx && octx)	1022	if (ictx && octx)
863	send_vpn_packet (pkt, si, tos);	1023	send_vpn_packet (pkt, si, tos);
864	else	1024	else
865	{	1025	{
866	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1026	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
867		1027	post_inject_queue ();
868	establish_connection ();
869	}	1028	}
870	}	1029	}
871		1030
872	void	1031	void
873	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
874	{	1033	{
875	last_activity = NOW;	1034	last_activity = ev_now ();
876		1035
877	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1036	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
878	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1037	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1038
		1039	if (connectmode == conf_node::C_DISABLED)
		1040	return;
879		1041
880	switch (pkt->typ ())	1042	switch (pkt->typ ())
881	{	1043	{
882	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
883	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
884	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
885	// when we receive a ping.	1049	// when we receive a ping.
886	if (!ictx)	1050	if (!ictx)
887	{	1051	{
888	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
889	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
890	}	1054	}
891	else	1055	else
		1056	// we would love to change the socket address here, but ping's aren't
		1057	// authenticated, so we best ignore it.
892	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
893		1059
894	break;	1060	break;
895		1061
896	case vpn_packet::PT_PONG:	1062	case vpn_packet::PT_PONG:
		1063	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1064
		1065	// a PONG might mean that the other side doesn't really know
		1066	// about our desire for communication.
		1067	establish_connection ();
897	break;	1068	break;
898		1069
899	case vpn_packet::PT_RESET:	1070	case vpn_packet::PT_RESET:
		1071	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1072
		1073	if (ictx && octx)
900	{	1074	{
901	reset_connection ();	1075	reset_connection ("remote reset");
902		1076
903	config_packet *p = (config_packet *) pkt;	1077	config_packet *p = (config_packet *) pkt;
904		1078
905	if (!p->chk_config ())	1079	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
906	{
907	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
908	conf->nodename, (const char *)rsi);
909	connectmode = conf_node::C_DISABLED;
910	}
911	else if (connectmode == conf_node::C_ALWAYS)
912	establish_connection ();	1080	establish_connection ();
913	}	1081	}
		1082
914	break;	1083	break;
915		1084
916	case vpn_packet::PT_AUTH_REQ:	1085	case vpn_packet::PT_AUTH_REQ:
917	if (auth_rate_limiter.can (rsi))	1086	if (auth_rate_limiter.can (rsi))
918	{	1087	{
919	auth_req_packet *p = (auth_req_packet *) pkt;	1088	auth_req_packet *p = (auth_req_packet *)pkt;
920		1089
921	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1090	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1091	conf->nodename, p->initiate ? "initiate" : "reply",
		1092	p->protocols, p->features);
922		1093
923	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1094	if (memcmp (p->magic, MAGIC, 8))
		1095	{
		1096	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1097	conf->nodename, (const char *)rsi);
		1098	}
		1099	else if (p->chk_config (conf, rsi))
924	{	1100	{
925	if (p->prot_minor != PROTOCOL_MINOR)	1101	if (p->prot_minor != PROTOCOL_MINOR)
926	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1102	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
927	conf->nodename, (const char *)rsi,	1103	conf->nodename, (const char *)rsi,
928	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1104	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
929		1105
930	if (p->initiate)	1106	if (p->initiate)
		1107	{
931	send_auth_request (rsi, false);	1108	send_auth_request (rsi, false);
932		1109
933	rsachallenge k;	1110	if (ictx && octx)
		1111	reset_connection ("reconnect");
		1112	}
934		1113
		1114	auth_data auth;
		1115
935	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1116	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
936	{	1117	{
937	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1118	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
938	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1119	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
939	break;
940	}	1120	}
941	else	1121	else
942	{	1122	{
943	delete octx;	1123	bool chg = !have_rcv_auth || memcmp (&rcv_auth, &auth, sizeof auth);
944		1124
945	octx = new crypto_ctx (k, 1);	1125	rcv_auth = auth;
946	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1126	have_rcv_auth = true;
947		1127
		1128	send_auth_response (rsi);
		1129
		1130	if (chg)
		1131	{
948	conf->protocols = p->protocols;	1132	conf->protocols = p->protocols;
949	features = p->features & config_packet::get_features ();	1133	features = p->features & config_packet::get_features ();
950		1134
951	send_auth_response (rsi, p->id, k);
952
953	connection_established ();	1135	connection_established (rsi);
954
955	break;	1136	}
956	}	1137	}
		1138
		1139	break;
957	}	1140	}
958	else
959	slog (L_WARN, _("%s(%s): protocol mismatch"),
960	conf->nodename, (const char *)rsi);
961		1141
962	send_reset (rsi);	1142	send_reset (rsi);
963	}	1143	}
964		1144
965	break;	1145	break;
966		1146
967	case vpn_packet::PT_AUTH_RES:	1147	case vpn_packet::PT_AUTH_RES:
968	{	1148	{
969	auth_res_packet *p = (auth_res_packet *) pkt;	1149	auth_res_packet *p = (auth_res_packet *)pkt;
970		1150
971	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1151	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
972		1152
973	if (p->chk_config ())	1153	auth_mac local_mac;
		1154	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1155
		1156	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
974	{	1157	{
975	if (p->prot_minor != PROTOCOL_MINOR)
976	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
977	conf->nodename, (const char *)rsi,
978	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
979
980	rsachallenge chg;
981
982	if (!rsa_cache.find (p->id, chg))
983	{
984	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1158	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
985	conf->nodename, (const char *)rsi);	1159	conf->nodename, (const char *)rsi);
986	break;
987	}	1160	}
988	else	1161	else if (!have_snd_auth)
989	{	1162	{
990	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1163	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
991		1164
992	if (!p->hmac_chk (cctx))	1165	have_snd_auth = true;
993	{
994	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
995	"could be an attack, or just corruption or a synchronization error"),
996	conf->nodename, (const char *)rsi);
997	break;
998	}
999	else
1000	{
1001	rsaresponse h;
1002
1003	rsa_hash (p->id, chg, h);
1004
1005	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1006	{
1007	prot_minor = p->prot_minor;
1008
1009	delete ictx; ictx = cctx;
1010
1011	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1012
1013	si = rsi;
1014	protocol = rsi.prot;
1015
1016	connection_established ();	1166	connection_established (rsi);
1017
1018	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1019	conf->nodename, (const char *)rsi,
1020	p->prot_major, p->prot_minor);
1021
1022	if (::conf.script_node_up)
1023	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1024	slog (L_WARN, _("node-up command execution failed, continuing."));
1025
1026	break;
1027	}
1028	else
1029	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1030	conf->nodename, (const char *)rsi);
1031	}
1032
1033	delete cctx;
1034	}
1035	}	1167	}
1036	}	1168	}
1037
1038	send_reset (rsi);
1039	break;	1169	break;
1040		1170
1041	case vpn_packet::PT_DATA_COMPRESSED:	1171	case vpn_packet::PT_DATA_COMPRESSED:
1042	#if !ENABLE_COMPRESSION	1172	#if !ENABLE_COMPRESSION
1043	send_reset (rsi);	1173	send_reset (rsi);
…		…
1049	if (ictx && octx)	1179	if (ictx && octx)
1050	{	1180	{
1051	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
1052		1182
1053	if (!p->hmac_chk (ictx))	1183	if (!p->hmac_chk (ictx))
		1184	{
		1185	// rekeying often creates temporary hmac auth floods
		1186	// we assume they don't take longer than a few seconds normally,
		1187	// and suppress messages and resets during that time.
		1188	//TODO: should be done per source address
		1189	if (!hmac_error)
		1190	{
		1191	hmac_error = ev_now () + 3;
		1192	break;
		1193	}
		1194	else if (hmac_error >= ev_now ())
		1195	break; // silently suppress
		1196	else
		1197	{
1054	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1198	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1055	"could be an attack, or just corruption or a synchronization error"),	1199	"could be an attack, or just corruption or a synchronization error."),
1056	conf->nodename, (const char *)rsi);	1200	conf->nodename, (const char *)rsi);
		1201	// reset
		1202	}
		1203	}
1057	else	1204	else
1058	{	1205	{
1059	u32 seqno;	1206	u32 seqno;
1060	tap_packet *d = p->unpack (this, seqno);	1207	tap_packet *d = p->unpack (this, seqno);
		1208	int seqclass = iseqno.seqno_classify (seqno);
1061		1209
1062	if (iseqno.recv_ok (seqno))	1210	hmac_error = 0;
		1211
		1212	if (seqclass == 0) // ok
1063	{	1213	{
1064	vpn->tap->send (d);	1214	vpn->tap->send (d);
1065		1215
1066	if (si != rsi)	1216	if (si != rsi)
1067	{	1217	{
1068	// fast re-sync on source address changes, useful especially for tcp/ip	1218	// fast re-sync on source address changes, useful especially for tcp/ip
		1219	//if (last_si_change < ev_now () + 5.)
1069	si = rsi;	1220	// {
1070
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1221	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1072	conf->nodename, (const char *)si, (const char *)rsi);	1222	conf->nodename, (const char *)si, (const char *)rsi);
		1223
		1224	si = rsi;
		1225
		1226	if (::conf.script_node_change)
		1227	{
		1228	run_script_cb *cb = new run_script_cb;
		1229	cb->set<connection, &connection::script_node_change> (this);
		1230	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1231	}
		1232
		1233	// }
		1234	//else
		1235	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1236	// conf->nodename, (const char *)si, (const char *)rsi);
1073	}	1237	}
		1238	}
		1239	else if (seqclass == 1) // far history
		1240	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1241	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1242	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1243	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1244	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1245	else if (seqclass == 3) // reset
		1246	{
		1247	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1248	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1249	send_reset (rsi);
1074	}	1250	}
1075		1251
1076	delete d;	1252	delete d;
1077	break;	1253	break;
1078	}	1254	}
…		…
1082	break;	1258	break;
1083		1259
1084	case vpn_packet::PT_CONNECT_REQ:	1260	case vpn_packet::PT_CONNECT_REQ:
1085	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1261	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1086	{	1262	{
1087	connect_req_packet *p = (connect_req_packet *) pkt;	1263	connect_req_packet *p = (connect_req_packet *)pkt;
1088		1264
1089	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1265	if (p->id > 0 && p->id <= vpn->conns.size ())
1090	connection *c = vpn->conns[p->id - 1];
1091	conf->protocols = p->protocols;
1092
1093	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1094	conf->id, p->id, c->ictx && c->octx);
1095
1096	if (c->ictx && c->octx)
1097	{	1266	{
		1267	connection *c = vpn->conns[p->id - 1];
		1268	conf->protocols = p->protocols;
		1269
		1270	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1271	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1272	p->protocols,
		1273	c->ictx && c->octx);
		1274
		1275	if (c->ictx && c->octx)
		1276	{
1098	// send connect_info packets to both sides, in case one is	1277	// send connect_info packets to both sides, in case one is
1099	// behind a nat firewall (or both ;)	1278	// behind a nat firewall (or both ;)
1100	c->send_connect_info (conf->id, si, conf->protocols);	1279	c->send_connect_info (conf->id, si, conf->protocols);
1101	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1280	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1281	}
		1282	else
		1283	c->establish_connection ();
1102	}	1284	}
1103	else	1285	else
1104	c->establish_connection ();	1286	slog (L_WARN,
		1287	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1288	p->id);
1105	}	1289	}
1106		1290
1107	break;	1291	break;
1108		1292
1109	case vpn_packet::PT_CONNECT_INFO:	1293	case vpn_packet::PT_CONNECT_INFO:
1110	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1294	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1111	{	1295	{
1112	connect_info_packet *p = (connect_info_packet *)pkt;	1296	connect_info_packet *p = (connect_info_packet *)pkt;
1113		1297
1114	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1298	if (p->id > 0 && p->id <= vpn->conns.size ())
1115	{	1299	{
1116	connection *c = vpn->conns[p->id - 1];	1300	connection *c = vpn->conns[p->id - 1];
1117		1301
1118	c->conf->protocols = p->protocols;	1302	c->conf->protocols = p->protocols;
1119	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1303	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1120	p->si.upgrade_protocol (protocol, c->conf);	1304	p->si.upgrade_protocol (protocol, c->conf);
1121		1305
1122	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1306	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1123	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1307	conf->nodename,
		1308	vpn->conns[p->id - 1]->conf->nodename,
		1309	(const char *)p->si,
		1310	p->protocols,
		1311	protocol,
		1312	p->si.supported_protocols (c->conf),
		1313	!c->ictx && !c->octx);
1124		1314
1125	const sockinfo &dsi = forward_si (p->si);	1315	const sockinfo &dsi = forward_si (p->si);
1126		1316
1127	if (dsi.valid ())	1317	if (dsi.valid ())
1128	c->send_auth_request (dsi, true);	1318	c->send_auth_request (dsi, true);
		1319	else
		1320	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1321	vpn->conns[p->id - 1]->conf->nodename,
		1322	(const char *)p->si);
1129	}	1323	}
		1324	else
		1325	slog (L_WARN,
		1326	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1327	p->id);
1130	}	1328	}
1131		1329
1132	break;	1330	break;
1133		1331
1134	default:	1332	default:
1135	send_reset (rsi);	1333	send_reset (rsi);
1136	break;	1334	break;
1137	}	1335	}
1138	}	1336	}
1139		1337
1140	void connection::keepalive_cb (time_watcher &w)	1338	inline void
		1339	connection::keepalive_cb (ev::timer &w, int revents)
1141	{	1340	{
1142	if (NOW >= last_activity + ::conf.keepalive + 30)	1341	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1342
		1343	if (when >= 0)
		1344	w.start (when);
		1345	else if (when < -15)
1143	{	1346	{
1144	reset_connection ();	1347	reset_connection ("keepalive overdue");
1145	establish_connection ();	1348	establish_connection ();
1146	}	1349	}
1147	else if (NOW < last_activity + ::conf.keepalive)
1148	w.start (last_activity + ::conf.keepalive);
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1350	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1351	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1352	{
		1353	w.start (3);
1152	send_ping (si);	1354	send_ping (si);
1153	w.start (NOW + 5);
1154	}	1355	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1356	else if (when >= -10)
1156	// hold ondemand connections implicitly a few seconds longer	1357	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1358	// should delete octx, though, or something like that ;)
1158	w.start (last_activity + ::conf.keepalive + 10);	1359	w.start (when + 10);
1159	else	1360	else
1160	reset_connection ();	1361	reset_connection ("keepalive timeout");
1161	}	1362	}
1162		1363
		1364	void
1163	void connection::send_connect_request (int id)	1365	connection::send_connect_request (int id)
1164	{	1366	{
1165	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1367	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1166		1368
1167	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1369	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1370	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1371	THISNODE->protocols);
1168	p->hmac_set (octx);	1372	p->hmac_set (octx);
1169	send_vpn_packet (p, si);	1373	send_vpn_packet (p, si);
1170		1374
1171	delete p;	1375	delete p;
1172	}	1376	}
1173		1377
		1378	void
1174	void connection::script_init_env (const char *ext)	1379	connection::script_init_env (const char *ext)
1175	{	1380	{
1176	char *env;	1381	char *env;
1177	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1382	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1178	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1383	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1179	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1384	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1180	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1385	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1181	conf->id & 0xff); putenv (env);	1386	conf->id & 0xff); putenv (env);
1182	}	1387	}
1183		1388
		1389	void
1184	void connection::script_init_connect_env ()	1390	connection::script_init_connect_env ()
1185	{	1391	{
1186	vpn->script_init_env ();	1392	vpn->script_init_env ();
1187		1393
1188	char *env;	1394	char *env;
1189	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1395	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1396	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1190	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1397	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1191	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1398	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1192	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1399	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1193	}	1400	}
1194		1401
		1402	inline const char *
1195	const char *connection::script_node_up ()	1403	connection::script_node_up ()
1196	{	1404	{
1197	script_init_connect_env ();	1405	script_init_connect_env ();
1198		1406
1199	putenv ("STATE=up");	1407	putenv ((char *)"STATE=up");
1200		1408
1201	char *filename;	1409	char *filename;
1202	asprintf (&filename,	1410	asprintf (&filename,
1203	"%s/%s",	1411	"%s/%s",
1204	confbase,	1412	confbase,
1205	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1413	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1206		1414
1207	return filename;	1415	return filename;
1208	}	1416	}
1209		1417
1210	const char *connection::script_node_down ()	1418	inline const char *
		1419	connection::script_node_change ()
1211	{	1420	{
1212	script_init_connect_env ();	1421	script_init_connect_env ();
1213		1422
		1423	putenv ((char *)"STATE=change");
		1424
		1425	char *filename;
		1426	asprintf (&filename,
		1427	"%s/%s",
		1428	confbase,
		1429	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1430
		1431	return filename;
		1432	}
		1433
		1434	inline const char *
		1435	connection::script_node_down ()
		1436	{
		1437	script_init_connect_env ();
		1438
1214	putenv ("STATE=down");	1439	putenv ((char *)"STATE=down");
1215		1440
1216	char *filename;	1441	char *filename;
1217	asprintf (&filename,	1442	asprintf (&filename,
1218	"%s/%s",	1443	"%s/%s",
1219	confbase,	1444	confbase,
…		…
1221		1446
1222	return filename;	1447	return filename;
1223	}	1448	}
1224		1449
1225	connection::connection (struct vpn *vpn, conf_node *conf)	1450	connection::connection (struct vpn *vpn, conf_node *conf)
1226	: vpn(vpn), conf(conf)	1451	: vpn(vpn), conf(conf),
1227	, rekey (this, &connection::rekey_cb)
1228	, keepalive (this, &connection::keepalive_cb)
1229	, establish_connection (this, &connection::establish_connection_cb)
1230	#if ENABLE_DNS	1452	#if ENABLE_DNS
1231	, dns (0)	1453	dns (0),
1232	#endif	1454	#endif
		1455	data_queue(conf->max_ttl, conf->max_queue + 1),
		1456	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1233	{	1457	{
		1458	rekey .set<connection, &connection::rekey_cb > (this);
		1459	keepalive .set<connection, &connection::keepalive_cb > (this);
		1460	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1461
		1462	last_establish_attempt = 0.;
1234	octx = ictx = 0;	1463	octx = ictx = 0;
1235	retry_cnt = 0;
1236		1464
1237	if (!conf->protocols) // make sure some protocol is enabled	1465	connectmode = conf->connectmode;
1238	conf->protocols = PROT_UDPv4;
1239		1466
1240	connectmode = conf_node::C_ALWAYS; // initial setting	1467	// queue a dummy packet to force an initial connection attempt
		1468	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1469	vpn_queue.put (new net_packet);
		1470
1241	reset_connection ();	1471	reset_connection ("startup");
1242	}	1472	}
1243		1473
1244	connection::~connection ()	1474	connection::~connection ()
1245	{	1475	{
1246	shutdown ();	1476	shutdown ();
1247	}	1477	}
1248		1478
		1479	void
1249	void connection_init ()	1480	connection_init ()
1250	{	1481	{
1251	auth_rate_limiter.clear ();	1482	auth_rate_limiter.clear ();
1252	reset_rate_limiter.clear ();	1483	reset_rate_limiter.clear ();
1253	}	1484	}
1254		1485

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