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Comparing gvpe/src/connection.C (file contents):
Revision 1.46 by pcg, Sat Mar 5 19:13:15 2005 UTC vs.
Revision 1.110 by root, Thu Jan 9 08:15:05 2014 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. 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.
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>
32		43
33	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
34		50
35	#include "conf.h"	51	#include "conf.h"
36	#include "slog.h"	52	#include "slog.h"
37	#include "device.h"	53	#include "device.h"
38	#include "vpn.h"	54	#include "vpn.h"
39	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
40		57
41	#include "netcompat.h"	58	#include "netcompat.h"
42		59
43	#if !HAVE_RAND_PSEUDO_BYTES
44	# define RAND_pseudo_bytes RAND_bytes
45	#endif
46
47	#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
48		62
49	#define ULTRA_FAST 1	63	#define ULTRA_FAST 1
50	#define HLOG 15	64	#define HLOG 15
51	#include "lzf/lzf.h"	65	#include "lzf/lzf.h"
52	#include "lzf/lzf_c.c"	66	#include "lzf/lzf_c.c"
53	#include "lzf/lzf_d.c"	67	#include "lzf/lzf_d.c"
54		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
55	struct crypto_ctx	113	struct crypto_ctx
56	{	114	{
57	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
58	HMAC_CTX hctx;	116	HMAC_CTX hctx;
59		117
60	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);
61	~crypto_ctx ();	119	~crypto_ctx ();
62	};	120	};
63		121
64	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)
65	{	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
66	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
67	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));
68	HMAC_CTX_init (&hctx);	154	}
69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
70	}	155	}
71		156
72	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
73	{	158	{
74	require (EVP_CIPHER_CTX_cleanup (&cctx));	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
75	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
76	}	161	}
77		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
78	static void	190	static void
79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
80	{	192	{
81	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
82		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
83	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
84	require (EVP_DigestInit (&ctx, RSA_HASH));	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
85	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
86	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
87	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
88	EVP_MD_CTX_cleanup (&ctx);
89	}	197	}
90		198
91	struct rsa_entry {	199	void
92	tstamp expire;	200	connection::generate_auth_data ()
93	rsaid id;
94	rsachallenge chg;
95	};
96
97	struct rsa_cache : list<rsa_entry>
98	{	201	{
99	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
100
101	bool find (const rsaid &id, rsachallenge &chg)
102	{
103	for (iterator i = begin (); i != end (); ++i)
104	{
105	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
106	{
107	memcpy (&chg, &i->chg, sizeof chg);
108
109	erase (i);
110	return true;
111	}
112	}
113
114	if (cleaner.at < NOW)
115	cleaner.start (NOW + RSA_TTL);
116
117	return false;
118	}
119
120	void gen (rsaid &id, rsachallenge &chg)
121	{
122	rsa_entry e;
123
124	RAND_bytes ((unsigned char *)&id, sizeof id);
125	RAND_bytes ((unsigned char *)&chg, sizeof chg);
126
127	e.expire = NOW + RSA_TTL;
128	e.id = id;
129	memcpy (&e.chg, &chg, sizeof chg);
130
131	push_back (e);
132
133	if (cleaner.at < NOW)
134	cleaner.start (NOW + RSA_TTL);
135	}
136
137	rsa_cache ()
138	: cleaner (this, &rsa_cache::cleaner_cb)
139	{ }	203	{
		204	// request data
		205	rand_fill (snd_auth.rsa);
		206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
140		207
141	} rsa_cache;	208	// eventual response data
142		209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
143	void rsa_cache::cleaner_cb (time_watcher &w)
144	{
145	if (!empty ())
146	{	210	}
147	w.start (NOW + RSA_TTL);
148		211
149	for (iterator i = begin (); i != end (); )	212	// every use prolongs the expiry
150	if (i->expire <= NOW)	213	auth_expire = ev_now () + AUTH_TTL;
151	i = erase (i);
152	else
153	++i;
154	}
155	}	214	}
156		215
157	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
158		217
159	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)
160	{	220	{
161	if (queue[i])	221	queue = new pkt [max_queue];
162	{
163	delete queue[i];
164	j = (j + 1) % QUEUEDEPTH;
165	}
166		222
167	queue[i] = p;
168
169	i = (i + 1) % QUEUEDEPTH;
170	}
171
172	net_packet *pkt_queue::get ()
173	{
174	net_packet *p = queue[j];
175
176	if (p)
177	{
178	queue[j] = 0;
179	j = (j + 1) % QUEUEDEPTH;
180	}
181
182	return p;
183	}
184
185	pkt_queue::pkt_queue ()
186	{
187	memset (queue, 0, sizeof (queue));
188	i = 0;	223	i = 0;
189	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190	}	227	}
191		228
192	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
193	{	230	{
194	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
195	delete queue[i];	234	delete [] queue;
196	}	235	}
197		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
198	struct net_rateinfo {	293	struct net_rateinfo
		294	{
199	u32 host;	295	u32 host;
200	double pcnt, diff;	296	double pcnt, diff;
201	tstamp last;	297	tstamp last;
202	};	298	};
203		299
…		…
213		309
214	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	311	bool can (u32 host);
216	};	312	};
217		313
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		315
		316	bool
220	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
221	{	318	{
222	iterator i;	319	iterator i;
223		320
224	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
225	if (i->host == host)	322	if (i->host == host)
226	break;	323	break;
227	else if (i->last < NOW - NRL_EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
228	i = erase (i);	325	i = erase (i);
229	else	326	else
230	i++;	327	i++;
231		328
232	if (i == end ())	329	if (i == end ())
…		…
234	net_rateinfo ri;	331	net_rateinfo ri;
235		332
236	ri.host = host;	333	ri.host = host;
237	ri.pcnt = 1.;	334	ri.pcnt = 1.;
238	ri.diff = NRL_MAXDIF;	335	ri.diff = NRL_MAXDIF;
239	ri.last = NOW;	336	ri.last = ev_now ();
240		337
241	push_front (ri);	338	push_front (ri);
242		339
243	return true;	340	return true;
244	}	341	}
…		…
246	{	343	{
247	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
248	erase (i);	345	erase (i);
249		346
250	ri.pcnt = ri.pcnt * NRL_ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252		349
253	ri.last = NOW;	350	ri.last = ev_now ();
254		351
255	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
256		353
257	bool send = dif > NRL_CUTOFF;	354	bool send = dif > NRL_CUTOFF;
258		355
…		…
270	}	367	}
271	}	368	}
272		369
273	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
274		371
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	374	{
279	unsigned int xlen;
280
281	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
282		376
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
285	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	380	}
288		381
289	void	382	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	384	{
292	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		386	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	388	}
296		389
297	bool	390	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	392	{
300	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		394	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	396	}
304		397
		398	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	400	{
307	type = type_;	401	type = type_;
308		402
309	int src = THISNODE->id;	403	int src = THISNODE->id;
310		404
…		…
315		409
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		412
319	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
320	{	422	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno
322
323	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324	tap_packet *unpack (connection *conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	424	}
		425	};
332		426
333	void	427	void
334	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)
335	{	429	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
339		433
340	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
342		436
343	if (conn->features & ENABLE_COMPRESSION)	437	if (conn->features & FEATURE_COMPRESSION)
344	{	438	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		440
347	if (cl)	441	if (cl)
348	{	442	{
…		…
354	d[1] = cl;	448	d[1] = cl;
355	}	449	}
356	}	450	}
357	#endif	451	#endif
358		452
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
360		454
361	struct {	455	struct {
362	#if RAND_SIZE	456	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
364	#endif	458	#endif
365	u32 seqno;	459	u32 seqno;
366	} datahdr;	460	} datahdr;
367		461
368	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE	463	#if RAND_SIZE
370	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);
371	#endif	467	#endif
372		468
373	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *) &datahdr, DATAHDR));
…		…
397	int outl = 0, outl2;	493	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
399	u8 *d;	495	u8 *d;
400	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
401		497
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
403		499
404	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
406		502
407	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	504	d = cdata;
409	else	505	else
410	#endif	506	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
412		508
413	/* 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
414	require (EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	517	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	518	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	519	outl += outl2;
418		520
…		…
449	}	551	}
450	};	552	};
451		553
452	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
453	{	555	{
454	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
460		560
461	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
462	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		563
464	static u8 get_features ()	564	static u8 get_features ()
465	{	565	{
466	u8 f = 0;	566	u8 f = 0;
467	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
468	f |= FEATURE_COMPRESSION;	568	f |= FEATURE_COMPRESSION;
469	#endif	569	#endif
470	#if ENABLE_ROHC	570	#if ENABLE_ROHC
471	f |= FEATURE_ROHC;	571	f |= FEATURE_ROHC;
472	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f |= FEATURE_BRIDGING;
		575	#endif
473	return f;	576	return f;
474	}	577	}
475	};	578	};
476		579
		580	void
477	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
478	{	582	{
479	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
480	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
481	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
482	hmaclen = HMACLENGTH;	586	flags = 0;
483	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
484	challengelen = sizeof (rsachallenge);
485	features = get_features ();	587	features = get_features ();
486		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	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 ()));
490		594
491	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	596	set_hdr (type, dst);
493	}	597	}
494		598
495	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
496	{	601	{
497	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
498	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);
499	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
500	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)"),
501	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503	#if 0 // this implementation should handle all flag settings
504	else if (flags != curflags ())
505	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
506	#endif
507	else if (challengelen != sizeof (rsachallenge))
508	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
509	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
510	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)"),
511	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
512	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
513	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
514	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 ()));
515	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)
516	return true;	625	return true;
		626	}
517		627
518	return false;	628	return false;
519	}	629	}
520		630
521	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
522	{	632	{
523	char magic[8];	633	char magic[8];
524	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
525	u8 protocols; // supported protocols (will be patched on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
526	u8 pad2, pad3;	636	u8 pad2, pad3;
527	rsaid id;	637	auth_encr encr;
528	rsaencrdata encr;
529		638
530	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
531	{	640	{
532	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
533	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
534	initiate = !!initiate_;	643	initiate = !!initiate_;
535	protocols = protocols_;	644	protocols = protocols_;
536		645
537	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
538	}	647	}
539	};	648	};
540		649
541	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
542	{	651	{
543	rsaid id;
544	u8 pad1, pad2, pad3;
545	u8 response_len; // encrypted length
546	rsaresponse response;	652	auth_response response;
547		653
548	auth_res_packet (int dst)	654	auth_res_packet (int dst)
549	{	655	{
550	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
551		657
552	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
553	}	659	}
554	};	660	};
555		661
…		…
585	};	691	};
586		692
587	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
588		694
589	void	695	void
590	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
591	{	697	{
592	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."));
593	{	714	}
594	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);
595		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
596	// make sure rekeying timeouts are slightly asymmetric	724	// make sure rekeying timeouts are slightly asymmetric
597	rekey.start (NOW + ::conf.rekey	725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
598	+ (conf->id > THISNODE->id ? 10 : 0));	726	rekey.start (rekey_interval, rekey_interval);
		727
		728	hmac_error = 0.;
		729
599	keepalive.start (NOW + ::conf.keepalive);	730	keepalive.start (::conf.keepalive);
600		731
601	// send queued packets	732	// send queued packets
602	if (ictx && octx)
603	{
604	while (tap_packet *p = (tap_packet *)data_queue.get ())	733	while (tap_packet *p = (tap_packet *)data_queue.get ())
605	{	734	{
606	send_data_packet (p);	735	if (p->len) send_data_packet (p);
607	delete p;	736	delete p;
608	}	737	}
609		738
610	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	739	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
611	{	740	{
612	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
613	delete p;	742	delete p;
614	}
615	}
616	}	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 ());
617	else	753	else
618	{	754	{
619	retry_cnt = 0;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
620	establish_connection.start (NOW + 5);	756	protocol = 0;
621	keepalive.stop ();
622	rekey.stop ();
623	}	757	}
624	}
625
626	void
627	connection::reset_si ()
628	{
629	protocol = best_protocol (THISNODE->protocols & conf->protocols);
630
631	// mask out protocols we cannot establish
632	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
633	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
634	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
635		758
636	si.set (conf, protocol);	759	si.set (conf, protocol);
637	}	760	}
638		761
639	// ensure sockinfo is valid, forward if necessary	762	// ensure sockinfo is valid, forward if necessary
640	const sockinfo &	763	const sockinfo &
641	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
642	{	765	{
643	if (!si.valid ())	766	if (!si.valid ())
644	{	767	{
645	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
646		769
647	if (r)	770	if (r)
648	{	771	{
649	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."),
650	conf->nodename, r->conf->nodename, (const char *)r->si);	773	conf->nodename, r->conf->nodename);
651	return r->si;	774	return r->si;
652	}	775	}
653	else	776	else
654	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
655	conf->nodename);	778	conf->nodename);
656	}	779	}
657		780
658	return si;	781	return si;
659	}	782	}
660		783
661	void	784	void
662	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)
663	{	786	{
664	if (!vpn->send_vpn_packet (pkt, si, tos))	787	if (!vpn->send_vpn_packet (pkt, si, tos))
665	reset_connection ();	788	reset_connection ("packet send error");
666	}	789	}
667		790
668	void	791	void
669	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
670	{	793	{
671	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
672		795
673	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);
674	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
675		800
676	delete pkt;	801	delete pkt;
677	}	802	}
678		803
…		…
693	void	818	void
694	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
695	{	820	{
696	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);
697		822
698	rsachallenge chg;	823	generate_auth_data ();
699	rsa_cache.gen (pkt->id, chg);
700	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
701		825
702	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);
703
704	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
705		828
706	delete pkt;	829	delete pkt;
707	}	830	}
708		831
709	void	832	void
710	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
711	{	834	{
712	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
713		836
714	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);
715		839
716	rsa_hash (id, chg, pkt->response);
717
718	pkt->hmac_set (octx);
719
720	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);
721
722	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
723		842
724	delete pkt;	843	delete pkt;
725	}	844	}
726		845
727	void	846	void
728	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
729	{	848	{
730	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
731	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
732		852
733	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);
734		854
735	r->hmac_set (octx);	855	r->hmac_set (octx);
736	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
737		857
738	delete r;	858	delete r;
739	}	859	}
740		860
741	void	861	inline void
742	connection::establish_connection_cb (time_watcher &w)	862	connection::establish_connection_cb (ev::timer &w, int revents)
743	{	863	{
744	if (!ictx	864	if (!(ictx && octx)
745	&& conf != THISNODE	865	&& conf != THISNODE
746	&& connectmode != conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
747	&& connectmode != conf_node::C_DISABLED	867	&& connectmode != conf_node::C_DISABLED
748	&& NOW > w.at)	868	&& !w.is_active ())
749	{	869	{
750	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
751		871	// and stop trying. should probably be handled by a per-connection expire handler.
752	if (retry_int < conf->max_retry)	872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
753	retry_cnt++;	875	return;
754	else	876	}
755	retry_int = conf->max_retry;
756		877
757	w.start (NOW + retry_int);	878	last_establish_attempt = ev_now ();
		879
		880	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		881	? (retry_cnt & 3) + 1
		882	: 1 << (retry_cnt >> 2));
758		883
759	reset_si ();	884	reset_si ();
760		885
761	if (si.prot && !si.host)	886	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
		887
		888	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		889	{
		890	/*TODO*/ /* start the timer so we don't recurse endlessly */
		891	w.start (1);
762	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
		893	}
763	else	894	else
764	{	895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
765	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
		901
		902	slow = slow || (dsi.prot & PROT_SLOW);
766		903
767	if (dsi.valid () && auth_rate_limiter.can (dsi))	904	if (dsi.valid () && auth_rate_limiter.can (dsi))
768	{	905	{
769	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))
770	send_auth_request (dsi, true);	910	send_auth_request (dsi, true);
771	else	911	else
772	send_ping (dsi, 0);	912	send_ping (dsi, 0);
773	}	913	}
774	}	914	}
775	}
776	}
777		915
		916	retry_int *= slow ? 4. : 0.9;
		917
		918	if (retry_int < conf->max_retry)
		919	retry_cnt++;
		920	else
		921	retry_int = conf->max_retry;
		922
		923	w.start (retry_int);
		924	}
		925	}
		926
778	void	927	void
779	connection::reset_connection ()	928	connection::reset_connection (const char *reason)
780	{	929	{
781	if (ictx && octx)	930	if (ictx && octx)
782	{	931	{
783	slog (L_INFO, _("%s(%s): connection lost"),	932	slog (L_INFO, _("%s(%s): connection lost (%s)"),
784	conf->nodename, (const char *)si);	933	conf->nodename, (const char *)si, reason);
785		934
786	if (::conf.script_node_down)	935	if (::conf.script_node_down)
787	run_script (run_script_cb (this, &connection::script_node_down), false);	936	{
		937	run_script_cb *cb = new run_script_cb;
		938	cb->set<connection, &connection::script_node_down> (this);
		939	run_script_queued (cb, _("node-down command execution failed, continuing."));
		940	}
788	}	941	}
789		942
790	delete ictx; ictx = 0;	943	delete ictx; ictx = 0;
791	delete octx; octx = 0;	944	delete octx; octx = 0;
792	#if ENABLE_DNS
793	dnsv4_reset_connection ();
794	#endif
795		945
796	si.host = 0;	946	si.host = 0;
797		947
		948	have_snd_auth = false;
		949	have_rcv_auth = false;
		950	auth_expire = 0.;
		951
798	last_activity = 0;	952	last_activity = 0.;
		953	//last_si_change = 0.;
799	retry_cnt = 0;	954	retry_cnt = 0;
800		955
801	rekey.stop ();	956	rekey.stop ();
802	keepalive.stop ();	957	keepalive.stop ();
803	establish_connection.stop ();	958	establish_connection.stop ();
…		…
807	connection::shutdown ()	962	connection::shutdown ()
808	{	963	{
809	if (ictx && octx)	964	if (ictx && octx)
810	send_reset (si);	965	send_reset (si);
811		966
812	reset_connection ();	967	reset_connection ("shutdown");
813	}	968	}
814		969
815	void	970	// poor-man's rekeying
816	connection::rekey_cb (time_watcher &w)	971	inline void
		972	connection::rekey_cb (ev::timer &w, int revents)
817	{	973	{
818	reset_connection ();	974	reset_connection ("rekeying");
819	establish_connection ();	975	establish_connection ();
820	}	976	}
821		977
822	void	978	void
823	connection::send_data_packet (tap_packet *pkt)	979	connection::send_data_packet (tap_packet *pkt)
…		…
837	if (oseqno > MAX_SEQNO)	993	if (oseqno > MAX_SEQNO)
838	rekey ();	994	rekey ();
839	}	995	}
840		996
841	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
842	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	1008	connection::inject_data_packet (tap_packet *pkt)
843	{	1009	{
844	if (ictx && octx)	1010	if (ictx && octx)
845	send_data_packet (pkt);	1011	send_data_packet (pkt);
846	else	1012	else
847	{	1013	{
848	if (!broadcast)//DDDD
849	data_queue.put (new tap_packet (*pkt));	1014	data_queue.put (new tap_packet (*pkt));
850		1015	post_inject_queue ();
851	establish_connection ();
852	}	1016	}
853	}	1017	}
854		1018
		1019	void
855	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1020	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
856	{	1021	{
857	if (ictx && octx)	1022	if (ictx && octx)
858	send_vpn_packet (pkt, si, tos);	1023	send_vpn_packet (pkt, si, tos);
859	else	1024	else
860	{	1025	{
861	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1026	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
862		1027	post_inject_queue ();
863	establish_connection ();
864	}	1028	}
865	}	1029	}
866		1030
867	void	1031	void
868	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1032	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
869	{	1033	{
870	last_activity = NOW;	1034	last_activity = ev_now ();
871		1035
872	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.",
873	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;
874		1041
875	switch (pkt->typ ())	1042	switch (pkt->typ ())
876	{	1043	{
877	case vpn_packet::PT_PING:	1044	case vpn_packet::PT_PING:
		1045	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1046
878	// we send pings instead of auth packets after some retries,	1047	// we send pings instead of auth packets after some retries,
879	// so reset the retry counter and establish a connection	1048	// so reset the retry counter and establish a connection
880	// when we receive a ping.	1049	// when we receive a ping.
881	if (!ictx)	1050	if (!ictx)
882	{	1051	{
883	if (auth_rate_limiter.can (rsi))	1052	if (auth_rate_limiter.can (rsi))
884	send_auth_request (rsi, true);	1053	send_auth_request (rsi, true);
885	}	1054	}
886	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.
887	send_ping (rsi, 1); // pong	1058	send_ping (rsi, 1); // pong
888		1059
889	break;	1060	break;
890		1061
891	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 ();
892	break;	1068	break;
893		1069
894	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)
895	{	1074	{
896	reset_connection ();	1075	reset_connection ("remote reset");
897		1076
898	config_packet *p = (config_packet *) pkt;	1077	config_packet *p = (config_packet *) pkt;
899		1078
900	if (!p->chk_config ())	1079	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
901	{
902	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
903	conf->nodename, (const char *)rsi);
904	connectmode = conf_node::C_DISABLED;
905	}
906	else if (connectmode == conf_node::C_ALWAYS)
907	establish_connection ();	1080	establish_connection ();
908	}	1081	}
		1082
909	break;	1083	break;
910		1084
911	case vpn_packet::PT_AUTH_REQ:	1085	case vpn_packet::PT_AUTH_REQ:
912	if (auth_rate_limiter.can (rsi))	1086	if (auth_rate_limiter.can (rsi))
913	{	1087	{
914	auth_req_packet *p = (auth_req_packet *) pkt;	1088	auth_req_packet *p = (auth_req_packet *)pkt;
915		1089
916	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);
917		1093
918	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))
919	{	1100	{
920	if (p->prot_minor != PROTOCOL_MINOR)	1101	if (p->prot_minor != PROTOCOL_MINOR)
921	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."),
922	conf->nodename, (const char *)rsi,	1103	conf->nodename, (const char *)rsi,
923	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1104	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
924		1105
925	if (p->initiate)	1106	if (p->initiate)
		1107	{
926	send_auth_request (rsi, false);	1108	send_auth_request (rsi, false);
927		1109
928	rsachallenge k;	1110	if (ictx && octx)
		1111	reset_connection ("reconnect");
		1112	}
929		1113
		1114	auth_data auth;
		1115
930	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1116	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
931	{	1117	{
932	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?"),
933	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));
934	break;
935	}	1120	}
936	else	1121	else
937	{	1122	{
938	delete octx;	1123	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
939		1124
940	octx = new crypto_ctx (k, 1);	1125	rcv_auth = auth;
941	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1126	have_rcv_auth = true;
942		1127
943	// compatibility code, remove when no longer required	1128	send_auth_response (rsi);
944	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
945		1129
		1130	if (chg)
		1131	{
946	conf->protocols = p->protocols;	1132	conf->protocols = p->protocols;
947	features = p->features & config_packet::get_features ();	1133	features = p->features & config_packet::get_features ();
948		1134
949	send_auth_response (rsi, p->id, k);
950
951	connection_established ();	1135	connection_established (rsi);
952
953	break;	1136	}
954	}	1137	}
		1138
		1139	break;
955	}	1140	}
956	else
957	slog (L_WARN, _("%s(%s): protocol mismatch"),
958	conf->nodename, (const char *)rsi);
959		1141
960	send_reset (rsi);	1142	send_reset (rsi);
961	}	1143	}
962		1144
963	break;	1145	break;
964		1146
965	case vpn_packet::PT_AUTH_RES:	1147	case vpn_packet::PT_AUTH_RES:
966	{	1148	{
967	auth_res_packet *p = (auth_res_packet *) pkt;	1149	auth_res_packet *p = (auth_res_packet *)pkt;
968		1150
969	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1151	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
970		1152
971	if (p->chk_config ())	1153	auth_mac local_mac;
		1154	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1155
		1156	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
972	{	1157	{
973	if (p->prot_minor != PROTOCOL_MINOR)
974	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
975	conf->nodename, (const char *)rsi,
976	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
977
978	rsachallenge chg;
979
980	if (!rsa_cache.find (p->id, chg))
981	{
982	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1158	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
983	conf->nodename, (const char *)rsi);	1159	conf->nodename, (const char *)rsi);
984	break;
985	}	1160	}
986	else	1161	else if (!have_snd_auth)
987	{	1162	{
988	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1163	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
989		1164
990	if (!p->hmac_chk (cctx))	1165	have_snd_auth = true;
991	{
992	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
993	"could be an attack, or just corruption or a synchronization error"),
994	conf->nodename, (const char *)rsi);
995	break;
996	}
997	else
998	{
999	rsaresponse h;
1000
1001	rsa_hash (p->id, chg, h);
1002
1003	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1004	{
1005	prot_minor = p->prot_minor;
1006
1007	delete ictx; ictx = cctx;
1008
1009	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1010
1011	si = rsi;
1012	protocol = rsi.prot;
1013
1014	connection_established ();	1166	connection_established (rsi);
1015
1016	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1017	conf->nodename, (const char *)rsi,
1018	p->prot_major, p->prot_minor);
1019
1020	if (::conf.script_node_up)
1021	run_script (run_script_cb (this, &connection::script_node_up), false);
1022
1023	break;
1024	}
1025	else
1026	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1027	conf->nodename, (const char *)rsi);
1028	}
1029
1030	delete cctx;
1031	}
1032	}	1167	}
1033	}	1168	}
1034
1035	send_reset (rsi);
1036	break;	1169	break;
1037		1170
1038	case vpn_packet::PT_DATA_COMPRESSED:	1171	case vpn_packet::PT_DATA_COMPRESSED:
1039	#if !ENABLE_COMPRESSION	1172	#if !ENABLE_COMPRESSION
1040	send_reset (rsi);	1173	send_reset (rsi);
…		…
1046	if (ictx && octx)	1179	if (ictx && octx)
1047	{	1180	{
1048	vpndata_packet *p = (vpndata_packet *)pkt;	1181	vpndata_packet *p = (vpndata_packet *)pkt;
1049		1182
1050	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	{
1051	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"
1052	"could be an attack, or just corruption or a synchronization error"),	1199	"could be an attack, or just corruption or a synchronization error."),
1053	conf->nodename, (const char *)rsi);	1200	conf->nodename, (const char *)rsi);
		1201	// reset
		1202	}
		1203	}
1054	else	1204	else
1055	{	1205	{
1056	u32 seqno;	1206	u32 seqno;
1057	tap_packet *d = p->unpack (this, seqno);	1207	tap_packet *d = p->unpack (this, seqno);
		1208	int seqclass = iseqno.seqno_classify (seqno);
1058		1209
1059	if (iseqno.recv_ok (seqno))	1210	hmac_error = 0;
		1211
		1212	if (seqclass == 0) // ok
1060	{	1213	{
1061	vpn->tap->send (d);	1214	vpn->tap->send (d);
1062		1215
1063	if (si != rsi)	1216	if (si != rsi)
1064	{	1217	{
1065	// fast re-sync on connection 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.)
1066	si = rsi;	1220	// {
1067
1068	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1221	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1069	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);
1070	}	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);
1071	}	1250	}
1072		1251
1073	delete d;	1252	delete d;
1074	break;	1253	break;
1075	}	1254	}
…		…
1079	break;	1258	break;
1080		1259
1081	case vpn_packet::PT_CONNECT_REQ:	1260	case vpn_packet::PT_CONNECT_REQ:
1082	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1261	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1083	{	1262	{
1084	connect_req_packet *p = (connect_req_packet *) pkt;	1263	connect_req_packet *p = (connect_req_packet *)pkt;
1085		1264
1086	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 ())
1087	connection *c = vpn->conns[p->id - 1];
1088	conf->protocols = p->protocols;
1089
1090	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1091	conf->id, p->id, c->ictx && c->octx);
1092
1093	if (c->ictx && c->octx)
1094	{	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	{
1095	// send connect_info packets to both sides, in case one is	1277	// send connect_info packets to both sides, in case one is
1096	// behind a nat firewall (or both ;)	1278	// behind a nat firewall (or both ;)
1097	c->send_connect_info (conf->id, si, conf->protocols);	1279	c->send_connect_info (conf->id, si, conf->protocols);
1098	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 ();
1099	}	1284	}
1100	else	1285	else
1101	c->establish_connection ();	1286	slog (L_WARN,
		1287	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1288	p->id);
1102	}	1289	}
1103		1290
1104	break;	1291	break;
1105		1292
1106	case vpn_packet::PT_CONNECT_INFO:	1293	case vpn_packet::PT_CONNECT_INFO:
1107	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1294	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1108	{	1295	{
1109	connect_info_packet *p = (connect_info_packet *)pkt;	1296	connect_info_packet *p = (connect_info_packet *)pkt;
1110		1297
1111	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 ())
1112	{	1299	{
1113	connection *c = vpn->conns[p->id - 1];	1300	connection *c = vpn->conns[p->id - 1];
1114		1301
1115	c->conf->protocols = p->protocols;	1302	c->conf->protocols = p->protocols;
1116	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));
1117	p->si.upgrade_protocol (protocol, c->conf);	1304	p->si.upgrade_protocol (protocol, c->conf);
1118		1305
1119	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]",
1120	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);
1121		1314
1122	const sockinfo &dsi = forward_si (p->si);	1315	const sockinfo &dsi = forward_si (p->si);
1123		1316
1124	if (dsi.valid ())	1317	if (dsi.valid ())
1125	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);
1126	}	1323	}
		1324	else
		1325	slog (L_WARN,
		1326	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1327	p->id);
1127	}	1328	}
1128		1329
1129	break;	1330	break;
1130		1331
1131	default:	1332	default:
1132	send_reset (rsi);	1333	send_reset (rsi);
1133	break;	1334	break;
1134	}	1335	}
1135	}	1336	}
1136		1337
1137	void connection::keepalive_cb (time_watcher &w)	1338	inline void
		1339	connection::keepalive_cb (ev::timer &w, int revents)
1138	{	1340	{
1139	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)
1140	{	1346	{
1141	reset_connection ();	1347	reset_connection ("keepalive overdue");
1142	establish_connection ();	1348	establish_connection ();
1143	}	1349	}
1144	else if (NOW < last_activity + ::conf.keepalive)
1145	w.start (last_activity + ::conf.keepalive);
1146	else if (conf->connectmode != conf_node::C_ONDEMAND	1350	else if (conf->connectmode != conf_node::C_ONDEMAND
1147	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1351	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1148	{	1352	{
		1353	w.start (3);
1149	send_ping (si);	1354	send_ping (si);
1150	w.start (NOW + 5);
1151	}	1355	}
1152	else if (NOW < last_activity + ::conf.keepalive + 10)	1356	else if (when >= -10)
1153	// hold ondemand connections implicitly a few seconds longer	1357	// hold ondemand connections implicitly a few seconds longer
1154	// should delete octx, though, or something like that ;)	1358	// should delete octx, though, or something like that ;)
1155	w.start (last_activity + ::conf.keepalive + 10);	1359	w.start (when + 10);
1156	else	1360	else
1157	reset_connection ();	1361	reset_connection ("keepalive timeout");
1158	}	1362	}
1159		1363
		1364	void
1160	void connection::send_connect_request (int id)	1365	connection::send_connect_request (int id)
1161	{	1366	{
1162	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);
1163		1368
1164	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);
1165	p->hmac_set (octx);	1372	p->hmac_set (octx);
1166	send_vpn_packet (p, si);	1373	send_vpn_packet (p, si);
1167		1374
1168	delete p;	1375	delete p;
1169	}	1376	}
1170		1377
1171	void connection::script_node ()	1378	void
		1379	connection::script_init_env (const char *ext)
1172	{	1380	{
1173	vpn->script_if_up ();
1174
1175	char *env;	1381	char *env;
		1382	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1383	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1384	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1385	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1386	conf->id & 0xff); putenv (env);
		1387	}
		1388
		1389	void
		1390	connection::script_init_connect_env ()
		1391	{
		1392	vpn->script_init_env ();
		1393
		1394	char *env;
1176	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);
1177	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1397	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1178	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1398	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1179	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1399	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1180	}	1400	}
1181		1401
		1402	inline const char *
1182	const char *connection::script_node_up ()	1403	connection::script_node_up ()
1183	{	1404	{
1184	script_node ();	1405	script_init_connect_env ();
1185		1406
1186	putenv ("STATE=up");	1407	putenv ((char *)"STATE=up");
1187		1408
		1409	char *filename;
		1410	asprintf (&filename,
		1411	"%s/%s",
		1412	confbase,
1188	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1413	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1189	}
1190		1414
		1415	return filename;
		1416	}
		1417
		1418	inline const char *
		1419	connection::script_node_change ()
		1420	{
		1421	script_init_connect_env ();
		1422
		1423	putenv ((char *)"STATE=change");
		1424
		1425	char *filename;
		1426	asprintf (&filename,
		1427	"%s/%s",
		1428	confbase,
		1429	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1430
		1431	return filename;
		1432	}
		1433
		1434	inline const char *
1191	const char *connection::script_node_down ()	1435	connection::script_node_down ()
1192	{	1436	{
1193	script_node ();	1437	script_init_connect_env ();
1194		1438
1195	putenv ("STATE=down");	1439	putenv ((char *)"STATE=down");
1196		1440
1197	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1441	char *filename;
		1442	asprintf (&filename,
		1443	"%s/%s",
		1444	confbase,
		1445	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1446
		1447	return filename;
1198	}	1448	}
1199		1449
1200	connection::connection (struct vpn *vpn, conf_node *conf)	1450	connection::connection (struct vpn *vpn, conf_node *conf)
1201	: vpn(vpn), conf(conf)	1451	: vpn(vpn), conf(conf),
1202	, rekey (this, &connection::rekey_cb)
1203	, keepalive (this, &connection::keepalive_cb)
1204	, establish_connection (this, &connection::establish_connection_cb)
1205	#if ENABLE_DNS	1452	#if ENABLE_DNS
1206	, dns (0)	1453	dns (0),
1207	#endif	1454	#endif
		1455	data_queue(conf->max_ttl, conf->max_queue + 1),
		1456	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1208	{	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.;
1209	octx = ictx = 0;	1463	octx = ictx = 0;
1210	retry_cnt = 0;
1211		1464
1212	if (!conf->protocols) // make sure some protocol is enabled	1465	connectmode = conf->connectmode;
1213	conf->protocols = PROT_UDPv4;
1214		1466
1215	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
1216	reset_connection ();	1471	reset_connection ("startup");
1217	}	1472	}
1218		1473
1219	connection::~connection ()	1474	connection::~connection ()
1220	{	1475	{
1221	shutdown ();	1476	shutdown ();
1222	}	1477	}
1223		1478
		1479	void
1224	void connection_init ()	1480	connection_init ()
1225	{	1481	{
1226	auth_rate_limiter.clear ();	1482	auth_rate_limiter.clear ();
1227	reset_rate_limiter.clear ();	1483	reset_rate_limiter.clear ();
1228	}	1484	}
1229		1485

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