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Comparing gvpe/src/connection.C (file contents):
Revision 1.60 by pcg, Sat Nov 10 05:14:22 2007 UTC vs.
Revision 1.116 by root, Mon Apr 1 03:10:26 2019 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) 2003-2008,2010,2011,2013,2016 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 <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
30		43
31	#include "conf.h"	44	#include "conf.h"
32	#include "slog.h"	45	#include "slog.h"
		46	#include "crypto.h"
33	#include "device.h"	47	#include "device.h"
34	#include "vpn.h"	48	#include "vpn.h"
35	#include "connection.h"	49	#include "connection.h"
		50	#include "hkdf.h"
36		51
37	#include "netcompat.h"	52	#include "netcompat.h"
38		53
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	54	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
44		55
		56	#define LZF_STATE_ARG 1
45	#define ULTRA_FAST 1	57	#define ULTRA_FAST 1
46	#define HLOG 15	58	#define HLOG 15
47	#include "lzf/lzf.h"	59	#define INIT_HTAB 0
48	#include "lzf/lzf_c.c"	60	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	61	#include "lzf/lzf_d.c"
50		62
		63	//////////////////////////////////////////////////////////////////////////////
		64
		65	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		66	static ev::child rs_child_ev;
		67
		68	namespace
		69	{
		70	void // c++ requires external linkage here, apparently :(
		71	rs_child_cb (ev::child &w, int revents)
		72	{
		73	w.stop ();
		74
		75	if (rs_queue.empty ())
		76	return;
		77
		78	pid_t pid = run_script (*rs_queue.front ().first, false);
		79	if (pid)
		80	{
		81	w.set (pid);
		82	w.start ();
		83	}
		84	else
		85	slog (L_WARN, rs_queue.front ().second);
		86
		87	delete rs_queue.front ().first;
		88	rs_queue.pop ();
		89	}
		90	};
		91
		92	// despite the fancy name, this is quite a hack
		93	static void
		94	run_script_queued (run_script_cb *cb, const char *warnmsg)
		95	{
		96	rs_queue.push (std::make_pair (cb, warnmsg));
		97
		98	if (!rs_child_ev.is_active ())
		99	{
		100	rs_child_ev.set<rs_child_cb> ();
		101	rs_child_ev ();
		102	}
		103	}
		104
		105	//////////////////////////////////////////////////////////////////////////////
		106
51	struct crypto_ctx	107	struct crypto_ctx
52	{	108	{
53	EVP_CIPHER_CTX cctx;	109	cipher cctx;
54	HMAC_CTX hctx;	110	hmac hctx;
55		111
56	crypto_ctx (const rsachallenge &challenge, int enc);	112	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
57	~crypto_ctx ();	113	~crypto_ctx ();
58	};	114	};
59		115
60	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	116	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
61	{	117	{
		118	ecdh_key s;
		119
		120	curve25519_combine (a, b, s);
		121
		122	{
		123	u8 mac_key[MAC_KEYSIZE];
		124	static const unsigned char mac_info[] = "gvpe mac key";
		125
		126	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		127	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		128	kdf.extract (s, sizeof (s));
		129	kdf.extract_done (HKDF_PRF_HASH ());
		130	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		131
		132	hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ());
		133	}
		134
		135	{
		136	u8 cipher_key[CIPHER_KEYSIZE];
		137	static const unsigned char cipher_info[] = "gvpe cipher key";
		138
		139	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
62	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	146	require (EVP_CipherInit_ex (cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	147	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	148	}
67		149
68	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
69	{	151	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	152	require (EVP_CIPHER_CTX_cleanup (cctx));
71	HMAC_CTX_cleanup (&hctx);	153	}
		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char *)&auth.rsa, (unsigned char *)&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char *)&encr.rsa, (unsigned char *)rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
72	}	180	}
73		181
74	static void	182	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
76	{	184	{
77	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
78		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	188	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	189	}
86		190
87	struct rsa_entry {	191	void
88	tstamp expire;	192	connection::generate_auth_data ()
89	rsaid id;
90	rsachallenge chg;
91	};
92
93	struct rsa_cache : list<rsa_entry>
94	{	193	{
95	void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;	194	if (auth_expire < ev_now ())
96
97	bool find (const rsaid &id, rsachallenge &chg)
98	{
99	for (iterator i = begin (); i != end (); ++i)
100	{	195	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev::ev_now ())	196	// request data
102	{	197	rand_fill (snd_auth.rsa);
103	memcpy (&chg, &i->chg, sizeof chg);	198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
104		199
105	erase (i);	200	// eventual response data
106	return true;	201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
107	}
108	}	202	}
109		203
110	if (!cleaner.is_active ())	204	// every use prolongs the expiry
111	cleaner.again ();
112
113	return false;
114	}
115
116	void gen (rsaid &id, rsachallenge &chg)
117	{
118	rsa_entry e;
119
120	RAND_bytes ((unsigned char *)&id, sizeof id);
121	RAND_bytes ((unsigned char *)&chg, sizeof chg);
122
123	e.expire = ev::ev_now () + RSA_TTL;	205	auth_expire = ev_now () + AUTH_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (!cleaner.is_active ())
130	cleaner.again ();
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{
136	cleaner.set (RSA_TTL, RSA_TTL);
137	}
138
139	} rsa_cache;
140
141	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
142	{
143	if (empty ())
144	w.stop ();
145	else
146	{
147	for (iterator i = begin (); i != end (); )
148	if (i->expire <= ev::ev_now ())
149	i = erase (i);
150	else
151	++i;
152	}
153	}	206	}
154		207
155	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
156		209
157	void pkt_queue::put (net_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
158	{	212	{
159	if (queue[i])	213	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		214
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;	215	i = 0;
187	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	219	}
189		220
190	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
191	{	222	{
192	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
193	delete queue[i];	226	delete [] queue;
194	}	227	}
195		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
196	struct net_rateinfo {	285	struct net_rateinfo
		286	{
197	u32 host;	287	u32 host;
198	double pcnt, diff;	288	double pcnt, diff;
199	tstamp last;	289	tstamp last;
200	};	290	};
201		291
…		…
211		301
212	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	303	bool can (u32 host);
214	};	304	};
215		305
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		307
		308	bool
218	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
219	{	310	{
220	iterator i;	311	iterator i;
221		312
222	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
223	if (i->host == host)	314	if (i->host == host)
224	break;	315	break;
225	else if (i->last < ev::ev_now () - NRL_EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	317	i = erase (i);
227	else	318	else
228	i++;	319	i++;
229		320
230	if (i == end ())	321	if (i == end ())
…		…
232	net_rateinfo ri;	323	net_rateinfo ri;
233		324
234	ri.host = host;	325	ri.host = host;
235	ri.pcnt = 1.;	326	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	327	ri.diff = NRL_MAXDIF;
237	ri.last = ev::ev_now ();	328	ri.last = ev_now ();
238		329
239	push_front (ri);	330	push_front (ri);
240		331
241	return true;	332	return true;
242	}	333	}
…		…
244	{	335	{
245	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
246	erase (i);	337	erase (i);
247		338
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (ev::ev_now () - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		341
251	ri.last = ev::ev_now ();	342	ri.last = ev_now ();
252		343
253	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
254		345
255	bool send = dif > NRL_CUTOFF;	346	bool send = dif > NRL_CUTOFF;
256		347
…		…
268	}	359	}
269	}	360	}
270		361
271	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
272		363
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
276	{	366	{
277	unsigned int xlen;	367	ctx->hctx.init ();
278		368	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
279	HMAC_CTX *hctx = &ctx->hctx;	369	ctx->hctx.digest (hmac_digest);
280
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
283	len - sizeof (hmac_packet));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	370	}
286		371
287	void	372	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	373	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	374	{
290	hmac_gen (ctx);	375	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		376	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	377	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	378	}
294		379
295	bool	380	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	381	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	382	{
298	hmac_gen (ctx);	383	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		384	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	385	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	386	}
302		387
		388	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	389	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	390	{
305	type = type_;	391	type = type_;
306		392
307	int src = THISNODE->id;	393	int src = THISNODE->id;
308		394
…		…
310	srcdst = ((src >> 8) << 4) | (dst >> 8);	396	srcdst = ((src >> 8) << 4) | (dst >> 8);
311	dst1 = dst;	397	dst1 = dst;
312	}	398	}
313		399
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	400	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		401
317	struct vpndata_packet : vpn_packet	402	struct vpndata_packet : vpn_packet
		403	{
		404	u32 ctr; // seqno
		405	u8 data[MAXVPNDATA];
		406
		407	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
		408	tap_packet *unpack (connection *conn, u32 &seqno);
		409
		410	private:
		411	const u32 data_hdr_size () const
318	{	412	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno	413	// the distance from beginning of packet to data member
320		414	return data - at (0);
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;
328	}
329	};	415	}
		416	};
		417
		418	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		419	static unsigned char *
		420	expand_iv (u32 ctr)
		421	{
		422	static u32 iv[IV_SIZE (CIPHER) / 4];
		423
		424	require (sizeof (iv) == 4 * 4);
		425	require (IV_SIZE (CIPHER) % 4 == 0);
		426
		427	iv[0] =
		428	iv[1] =
		429	iv[2] = ctr;
		430
		431	// I would reuse ctr here to to avoid potential endianness issues,
		432	// but it seems openssl wraps around. While this would be still ok,
		433	// and I don't even know if its true, let's play safe and initialise
		434	// to 0.
		435	iv[3] = 0;
		436
		437	return (unsigned char *)iv;
		438	}
330		439
331	void	440	void
332	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)	441	vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno)
333	{	442	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	443	EVP_CIPHER_CTX *cctx = conn->octx->cctx;
335	int outl = 0, outl2;	444	int outl = 0, outl2;
336	ptype type = PT_DATA_UNCOMPRESSED;	445	ptype type = PT_DATA_UNCOMPRESSED;
337		446
338	#if ENABLE_COMPRESSION	447	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	448	u8 cdata[MAX_MTU];
340		449
341	if (conn->features & ENABLE_COMPRESSION)	450	if (conn->features & FEATURE_COMPRESSION)
342	{	451	{
		452	static LZF_STATE lzf_state;
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	453	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7, lzf_state);
344		454
345	if (cl)	455	if (cl)
346	{	456	{
347	type = PT_DATA_COMPRESSED;	457	type = PT_DATA_COMPRESSED;
348	d = cdata;	458	d = cdata;
…		…
352	d[1] = cl;	462	d[1] = cl;
353	}	463	}
354	}	464	}
355	#endif	465	#endif
356		466
		467	ctr = htonl (seqno);
		468
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	469	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
358
359	struct {
360	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];
362	#endif
363	u32 seqno;
364	} datahdr;
365
366	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
369	#endif
370		470
371	require (EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	472	(unsigned char *)data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	473	(unsigned char *)d, l));
374	outl += outl2;	474	outl += outl2;
375		475
376	require (EVP_EncryptUpdate (cctx,	476	// it seems this is a nop for us, but we do it anyways
377	(unsigned char *) data + outl, &outl2,	477	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
378	(unsigned char *) d, l));
379	outl += outl2;	478	outl += outl2;
380		479
381	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
382	outl += outl2;
383
384	len = outl + data_hdr_size ();	480	len = data_hdr_size () + outl;
385		481
386	set_hdr (type, dst);	482	set_hdr (type, dst);
387		483
388	hmac_set (conn->octx);	484	hmac_set (conn->octx);
389	}	485	}
390		486
391	tap_packet *	487	tap_packet *
392	vpndata_packet::unpack (connection *conn, u32 &seqno)	488	vpndata_packet::unpack (connection *conn, u32 &seqno)
393	{	489	{
394	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	490	EVP_CIPHER_CTX *cctx = conn->ictx->cctx;
395	int outl = 0, outl2;	491	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	492	tap_packet *p = new tap_packet;
397	u8 *d;	493	u8 *d;
398	u32 l = len - data_hdr_size ();
399		494
		495	seqno = ntohl (ctr);
		496
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
401		498
402	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
404		501
405	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	503	d = cdata;
407	else	504	else
408	#endif	505	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6];
410		507
411	/* this overwrites part of the src mac, but we fix that later */	508	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	509	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	510	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	511	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	512	outl += outl2;
416		513
		514	// it seems this is a nop for us, but we do it anyways
417	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
418	outl += outl2;	516	outl += outl2;
419		517
420	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
421
422	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
423	id2mac (src (), p->src);	519	id2mac (src (), p->src);
424		520
425	#if ENABLE_COMPRESSION	521	#if ENABLE_COMPRESSION
426	if (type == PT_DATA_COMPRESSED)	522	if (type == PT_DATA_COMPRESSED)
427	{	523	{
428	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	524	u32 cl = (d[0] << 8) | d[1];
429		525
430	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	526	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
431	&(*p)[6 + 6], MAX_MTU)	527	&(*p)[6 + 6], MAX_MTU)
432	+ 6 + 6;	528	+ 6 + 6;
433	}	529	}
434	else	530	else
435	p->len = outl + (6 + 6 - DATAHDR);	531	p->len = outl + (6 + 6);
436	#endif	532	#endif
437		533
438	return p;	534	return p;
439	}	535	}
440		536
…		…
447	}	543	}
448	};	544	};
449		545
450	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
451	{	547	{
452	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
458		552
459	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
460	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		555
462	static u8 get_features ()	556	static u8 get_features ()
463	{	557	{
464	u8 f = 0;	558	u8 f = 0;
465	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
…		…
473	#endif	567	#endif
474	return f;	568	return f;
475	}	569	}
476	};	570	};
477		571
		572	void
478	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
479	{	574	{
480	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
481	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
482	randsize = RAND_SIZE;
483	hmaclen = HMACLENGTH;
484	flags = 0;	577	flags = 0;
485	challengelen = sizeof (rsachallenge);
486	features = get_features ();	578	features = get_features ();
487		579
		580	strncpy ((char *)serial, conf.serial, sizeof (serial));
		581
488	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
489	digest_nid = htonl (EVP_MD_type (RSA_HASH));
490	hmac_nid = htonl (EVP_MD_type (DIGEST));	583	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		584	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
491		585
492	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
493	set_hdr (type, dst);	587	set_hdr (type, dst);
494	}	588	}
495		589
496	bool config_packet::chk_config () const	590	bool
		591	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
497	{	592	{
498	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
499	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	594	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
500	else if (randsize != RAND_SIZE)	595	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
501	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
502	else if (hmaclen != HMACLENGTH)
503	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
504	else if (challengelen != sizeof (rsachallenge))
505	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
506	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	596	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
507	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	597	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
508	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	598	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
509	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
510	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	599	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
511	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	600	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		601	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		602	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		603	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		604	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
512	else	605	else
		606	{
		607	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		608
		609	if (cmp > 0)
		610	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		611	conf->nodename, (const char *)rsi);
		612	else if (cmp == 0)
513	return true;	613	return true;
		614	}
514		615
515	return false;	616	return false;
516	}	617	}
517		618
518	struct auth_req_packet : config_packet	619	struct auth_req_packet : config_packet // UNPROTECTED
519	{	620	{
520	char magic[8];	621	char magic[8];
521	u8 initiate; // false if this is just an automatic reply	622	u8 initiate; // false if this is just an automatic reply
522	u8 protocols; // supported protocols (will be patched on forward)	623	u8 protocols; // supported protocols (will be patched on forward)
523	u8 pad2, pad3;	624	u8 pad2, pad3;
524	rsaid id;	625	auth_encr encr;
525	rsaencrdata encr;
526		626
527	auth_req_packet (int dst, bool initiate_, u8 protocols_)	627	auth_req_packet (int dst, bool initiate_, u8 protocols_)
528	{	628	{
529	config_packet::setup (PT_AUTH_REQ, dst);	629	config_packet::setup (PT_AUTH_REQ, dst);
530	strncpy (magic, MAGIC, 8);	630	memcpy (magic, MAGIC, 8);
531	initiate = !!initiate_;	631	initiate = !!initiate_;
532	protocols = protocols_;	632	protocols = protocols_;
533		633
534	len = sizeof (*this) - sizeof (net_packet);	634	len = sizeof (*this) - sizeof (net_packet);
535	}	635	}
536	};	636	};
537		637
538	struct auth_res_packet : config_packet	638	struct auth_res_packet : vpn_packet // UNPROTECTED
539	{	639	{
540	rsaid id;
541	u8 pad1, pad2, pad3;
542	u8 response_len; // encrypted length
543	rsaresponse response;	640	auth_response response;
544		641
545	auth_res_packet (int dst)	642	auth_res_packet (int dst)
546	{	643	{
547	config_packet::setup (PT_AUTH_RES, dst);	644	set_hdr (PT_AUTH_RES, dst);
548		645
549	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
550	}	647	}
551	};	648	};
552		649
…		…
582	};	679	};
583		680
584	/////////////////////////////////////////////////////////////////////////////	681	/////////////////////////////////////////////////////////////////////////////
585		682
586	void	683	void
587	connection::connection_established ()	684	connection::connection_established (const sockinfo &rsi)
588	{	685	{
589	if (ictx && octx)	686	if (!have_snd_auth || !have_rcv_auth)
		687	return;
		688
		689	si = rsi;
		690	protocol = rsi.prot;
		691
		692	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		693	conf->nodename, (const char *)rsi,
		694	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		695	PROTOCOL_MAJOR, prot_minor);
		696
		697	if (::conf.script_node_up)
		698	{
		699	run_script_cb *cb = new run_script_cb;
		700	cb->set<connection, &connection::script_node_up> (this);
		701	run_script_queued (cb, _("node-up command execution failed, continuing."));
590	{	702	}
591	connectmode = conf->connectmode;	703
		704	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		705	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
592		706
		707	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		708	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		709
593	// make sure rekeying timeouts are slightly asymmetric	710	// make sure rekeying timeouts are slightly asymmetric
594	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);	711	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
595	rekey.start (rekey_interval, rekey_interval);	712	rekey.start (rekey_interval, rekey_interval);
		713
		714	hmac_error = 0.;
		715
596	keepalive.start (::conf.keepalive);	716	keepalive.start (::conf.keepalive);
597		717
598	// send queued packets	718	// send queued packets
599	if (ictx && octx)
600	{
601	while (tap_packet *p = (tap_packet *)data_queue.get ())	719	while (tap_packet *p = (tap_packet *)data_queue.get ())
602	{	720	{
603	send_data_packet (p);	721	if (p->len) send_data_packet (p);
604	delete p;	722	delete p;
605	}	723	}
606		724
607	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	725	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
608	{	726	{
609	send_vpn_packet (p, si, IPTOS_RELIABILITY);	727	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
610	delete p;	728	delete p;
611	}
612	}
613	}	729	}
		730
		731	vpn->connection_established (this);
		732	}
		733
		734	void
		735	connection::reset_si ()
		736	{
		737	if (vpn->can_direct (THISNODE, conf))
		738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
614	else	739	else
615	{	740	{
616	retry_cnt = 0;
617	establish_connection.start (5);
618	keepalive.stop ();
619	rekey.stop ();
620	}
621	}
622
623	void
624	connection::reset_si ()
625	{
626	protocol = best_protocol (THISNODE->protocols & conf->protocols);
627
628	// mask out protocols we cannot establish
629	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
630	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
631	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
632
633	if (protocol
634	&& (!conf->can_direct (THISNODE)
635	|| !THISNODE->can_direct (conf)))
636	{
637	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
638	protocol = 0;	742	protocol = 0;
639	}	743	}
640		744
641	si.set (conf, protocol);	745	si.set (conf, protocol);
642	}	746	}
…		…
645	const sockinfo &	749	const sockinfo &
646	connection::forward_si (const sockinfo &si) const	750	connection::forward_si (const sockinfo &si) const
647	{	751	{
648	if (!si.valid ())	752	if (!si.valid ())
649	{	753	{
650	connection *r = vpn->find_router ();	754	connection *r = vpn->find_router_for (this);
651		755
652	if (r)	756	if (r)
653	{	757	{
654	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	758	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
655	conf->nodename, r->conf->nodename, (const char *)r->si);	759	conf->nodename, r->conf->nodename);
656	return r->si;	760	return r->si;
657	}	761	}
658	else	762	else
659	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	763	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
660	conf->nodename);	764	conf->nodename);
661	}	765	}
662		766
663	return si;	767	return si;
664	}	768	}
665		769
666	void	770	void
667	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	771	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
668	{	772	{
669	if (!vpn->send_vpn_packet (pkt, si, tos))	773	if (!vpn->send_vpn_packet (pkt, si, tos))
670	reset_connection ();	774	reset_connection ("packet send error");
671	}	775	}
672		776
673	void	777	void
674	connection::send_ping (const sockinfo &si, u8 pong)	778	connection::send_ping (const sockinfo &si, u8 pong)
675	{	779	{
676	ping_packet *pkt = new ping_packet;	780	ping_packet *pkt = new ping_packet;
677		781
678	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	782	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		783
		784	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
679	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	785	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
680		786
681	delete pkt;	787	delete pkt;
682	}	788	}
683		789
…		…
698	void	804	void
699	connection::send_auth_request (const sockinfo &si, bool initiate)	805	connection::send_auth_request (const sockinfo &si, bool initiate)
700	{	806	{
701	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	807	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
702		808
703	rsachallenge chg;	809	generate_auth_data ();
704	rsa_cache.gen (pkt->id, chg);
705	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	810	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
706		811
707	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	812	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
708
709	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly	813	send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly
710		814
711	delete pkt;	815	delete pkt;
712	}	816	}
713		817
714	void	818	void
715	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	819	connection::send_auth_response (const sockinfo &si)
716	{	820	{
717	auth_res_packet *pkt = new auth_res_packet (conf->id);	821	auth_res_packet *pkt = new auth_res_packet (conf->id);
718		822
719	pkt->id = id;	823	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		824	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
720		825
721	rsa_hash (id, chg, pkt->response);
722
723	pkt->hmac_set (octx);
724
725	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
726
727	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
728		828
729	delete pkt;	829	delete pkt;
730	}	830	}
731		831
732	void	832	void
733	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	833	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
734	{	834	{
735	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	835	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
736	conf->id, rid, (const char *)rsi);	836	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		837	conf->protocols);
737		838
738	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	839	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
739		840
740	r->hmac_set (octx);	841	r->hmac_set (octx);
741	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
742		843
743	delete r;	844	delete r;
744	}	845	}
745		846
746	void	847	inline void
747	connection::establish_connection_cb (ev::timer &w, int revents)	848	connection::establish_connection_cb (ev::timer &w, int revents)
748	{	849	{
749	if (!ictx	850	if (!(ictx && octx)
750	&& conf != THISNODE	851	&& conf != THISNODE
751	&& connectmode != conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
752	&& connectmode != conf_node::C_DISABLED	853	&& connectmode != conf_node::C_DISABLED
753	&& !w.is_active ())	854	&& !w.is_active ())
754	{	855	{
		856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		857	// and stop trying. should probably be handled by a per-connection expire handler.
		858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ("no demand");
		861	return;
		862	}
		863
		864	last_establish_attempt = ev_now ();
		865
755	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
756	? (retry_cnt & 3) + 1	867	? (retry_cnt & 3) + 1
757	: 1 << (retry_cnt >> 2));	868	: 1 << (retry_cnt >> 2));
758		869
759	reset_si ();	870	reset_si ();
760		871
761	bool slow = si.prot & PROT_SLOW;	872	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
762		873
763	if (si.prot && !si.host)	874	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
764	{	875	{
765	/*TODO*/ /* start the timer so we don't recurse endlessly */	876	/*TODO*/ /* start the timer so we don't recurse endlessly */
766	w.start (1);	877	w.start (1);
767	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
768	}	879	}
769	else	880	else
770	{	881	{
		882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
		885
771	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
772		887
773	slow = slow || (dsi.prot & PROT_SLOW);	888	slow = slow || (dsi.prot & PROT_SLOW);
774		889
775	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
776	{	891	{
777	if (retry_cnt < 4)	892	// use ping after the first few retries
		893	// TODO: on rekeys, the other node might not interpret ping correctly,
		894	// TODO: as it will still have a valid connection
		895	if (retry_cnt < 4 && (!conf->low_power || THISNODE->low_power))
778	send_auth_request (dsi, true);	896	send_auth_request (dsi, true);
779	else	897	else
780	send_ping (dsi, 0);	898	send_ping (dsi, 0);
781	}	899	}
782	}	900	}
783		901
784	retry_int *= slow ? 8. : 0.7;	902	retry_int *= slow ? 4. : 0.9;
785		903
786	if (retry_int < conf->max_retry)	904	if (retry_int < conf->max_retry)
787	retry_cnt++;	905	retry_cnt++;
788	else	906	else
789	retry_int = conf->max_retry;	907	retry_int = conf->max_retry;
…		…
791	w.start (retry_int);	909	w.start (retry_int);
792	}	910	}
793	}	911	}
794		912
795	void	913	void
796	connection::reset_connection ()	914	connection::reset_connection (const char *reason)
797	{	915	{
798	if (ictx && octx)	916	if (ictx && octx)
799	{	917	{
800	slog (L_INFO, _("%s(%s): connection lost"),	918	slog (L_INFO, _("%s(%s): connection lost (%s)"),
801	conf->nodename, (const char *)si);	919	conf->nodename, (const char *)si, reason);
802		920
803	if (::conf.script_node_down)	921	if (::conf.script_node_down)
804	if (!run_script (run_script_cb (this, &connection::script_node_down), false))	922	{
		923	run_script_cb *cb = new run_script_cb;
		924	cb->set<connection, &connection::script_node_down> (this);
805	slog (L_WARN, _("node-down command execution failed, continuing."));	925	run_script_queued (cb, _("node-down command execution failed, continuing."));
		926	}
806	}	927	}
807		928
808	delete ictx; ictx = 0;	929	delete ictx; ictx = 0;
809	delete octx; octx = 0;	930	delete octx; octx = 0;
810	#if ENABLE_DNS
811	dnsv4_reset_connection ();
812	#endif
813		931
814	si.host = 0;	932	si.host = 0;
815		933
		934	have_snd_auth = false;
		935	have_rcv_auth = false;
		936	auth_expire = 0.;
		937
816	last_activity = 0;	938	last_activity = 0.;
		939	//last_si_change = 0.;
817	retry_cnt = 0;	940	retry_cnt = 0;
818		941
819	rekey.stop ();	942	rekey.stop ();
820	keepalive.stop ();	943	keepalive.stop ();
821	establish_connection.stop ();	944	establish_connection.stop ();
…		…
825	connection::shutdown ()	948	connection::shutdown ()
826	{	949	{
827	if (ictx && octx)	950	if (ictx && octx)
828	send_reset (si);	951	send_reset (si);
829		952
830	reset_connection ();	953	reset_connection ("shutdown");
831	}	954	}
832		955
833	void	956	// poor-man's rekeying
		957	inline void
834	connection::rekey_cb (ev::timer &w, int revents)	958	connection::rekey_cb (ev::timer &w, int revents)
835	{	959	{
836	reset_connection ();	960	reset_connection ("rekeying");
837	establish_connection ();	961	establish_connection ();
838	}	962	}
839		963
840	void	964	void
841	connection::send_data_packet (tap_packet *pkt)	965	connection::send_data_packet (tap_packet *pkt)
…		…
855	if (oseqno > MAX_SEQNO)	979	if (oseqno > MAX_SEQNO)
856	rekey ();	980	rekey ();
857	}	981	}
858		982
859	void	983	void
		984	connection::post_inject_queue ()
		985	{
		986	// force a connection every now and when when packets are sent (max 1/s)
		987	if (ev_now () - last_establish_attempt >= (conf->low_power || THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		988	establish_connection.stop ();
		989
		990	establish_connection ();
		991	}
		992
		993	void
860	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	994	connection::inject_data_packet (tap_packet *pkt)
861	{	995	{
862	if (ictx && octx)	996	if (ictx && octx)
863	send_data_packet (pkt);	997	send_data_packet (pkt);
864	else	998	else
865	{	999	{
866	if (!broadcast)
867	data_queue.put (new tap_packet (*pkt));	1000	data_queue.put (new tap_packet (*pkt));
868		1001	post_inject_queue ();
869	establish_connection ();
870	}	1002	}
871	}	1003	}
872		1004
		1005	void
873	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1006	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
874	{	1007	{
875	if (ictx && octx)	1008	if (ictx && octx)
876	send_vpn_packet (pkt, si, tos);	1009	send_vpn_packet (pkt, si, tos);
877	else	1010	else
878	{	1011	{
879	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1012	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
880		1013	post_inject_queue ();
881	establish_connection ();
882	}	1014	}
883	}	1015	}
884		1016
885	void	1017	void
886	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1018	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
887	{	1019	{
888	last_activity = ev::ev_now ();	1020	last_activity = ev_now ();
889		1021
890	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1022	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
891	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1023	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1024
		1025	if (connectmode == conf_node::C_DISABLED)
		1026	return;
892		1027
893	switch (pkt->typ ())	1028	switch (pkt->typ ())
894	{	1029	{
895	case vpn_packet::PT_PING:	1030	case vpn_packet::PT_PING:
		1031	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1032
896	// we send pings instead of auth packets after some retries,	1033	// we send pings instead of auth packets after some retries,
897	// so reset the retry counter and establish a connection	1034	// so reset the retry counter and establish a connection
898	// when we receive a ping.	1035	// when we receive a ping.
899	if (!ictx)	1036	if (!ictx)
900	{	1037	{
901	if (auth_rate_limiter.can (rsi))	1038	if (auth_rate_limiter.can (rsi))
902	send_auth_request (rsi, true);	1039	send_auth_request (rsi, true);
903	}	1040	}
904	else	1041	else
		1042	// we would love to change the socket address here, but ping's aren't
		1043	// authenticated, so we best ignore it.
905	send_ping (rsi, 1); // pong	1044	send_ping (rsi, 1); // pong
906		1045
907	break;	1046	break;
908		1047
909	case vpn_packet::PT_PONG:	1048	case vpn_packet::PT_PONG:
		1049	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1050
		1051	// a PONG might mean that the other side doesn't really know
		1052	// about our desire for communication.
		1053	establish_connection ();
910	break;	1054	break;
911		1055
912	case vpn_packet::PT_RESET:	1056	case vpn_packet::PT_RESET:
		1057	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1058
		1059	if (ictx && octx)
913	{	1060	{
914	reset_connection ();	1061	reset_connection ("remote reset");
915		1062
916	config_packet *p = (config_packet *) pkt;	1063	config_packet *p = (config_packet *) pkt;
917		1064
918	if (!p->chk_config ())	1065	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
919	{
920	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
921	conf->nodename, (const char *)rsi);
922	connectmode = conf_node::C_DISABLED;
923	}
924	else if (connectmode == conf_node::C_ALWAYS)
925	establish_connection ();	1066	establish_connection ();
926	}	1067	}
		1068
927	break;	1069	break;
928		1070
929	case vpn_packet::PT_AUTH_REQ:	1071	case vpn_packet::PT_AUTH_REQ:
930	if (auth_rate_limiter.can (rsi))	1072	if (auth_rate_limiter.can (rsi))
931	{	1073	{
932	auth_req_packet *p = (auth_req_packet *) pkt;	1074	auth_req_packet *p = (auth_req_packet *)pkt;
933		1075
934	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1076	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1077	conf->nodename, p->initiate ? "initiate" : "reply",
		1078	p->protocols, p->features);
935		1079
936	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1080	if (memcmp (p->magic, MAGIC, 8))
		1081	{
		1082	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1083	conf->nodename, (const char *)rsi);
		1084	}
		1085	else if (p->chk_config (conf, rsi))
937	{	1086	{
938	if (p->prot_minor != PROTOCOL_MINOR)	1087	if (p->prot_minor != PROTOCOL_MINOR)
939	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1088	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
940	conf->nodename, (const char *)rsi,	1089	conf->nodename, (const char *)rsi,
941	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1090	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
942		1091
943	if (p->initiate)	1092	if (p->initiate)
		1093	{
944	send_auth_request (rsi, false);	1094	send_auth_request (rsi, false);
945		1095
946	rsachallenge k;	1096	if (ictx && octx)
		1097	reset_connection ("reconnect");
		1098	}
947		1099
		1100	auth_data auth;
		1101
948	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1102	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
949	{	1103	{
950	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1104	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
951	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1105	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
952	break;
953	}	1106	}
954	else	1107	else
955	{	1108	{
956	delete octx;	1109	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
957		1110
958	octx = new crypto_ctx (k, 1);	1111	rcv_auth = auth;
959	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1112	have_rcv_auth = true;
960		1113
		1114	send_auth_response (rsi);
		1115
		1116	if (chg)
		1117	{
961	conf->protocols = p->protocols;	1118	conf->protocols = p->protocols;
962	features = p->features & config_packet::get_features ();	1119	features = p->features & config_packet::get_features ();
963		1120
964	send_auth_response (rsi, p->id, k);
965
966	connection_established ();	1121	connection_established (rsi);
967
968	break;	1122	}
969	}	1123	}
		1124
		1125	break;
970	}	1126	}
971	else
972	slog (L_WARN, _("%s(%s): protocol mismatch"),
973	conf->nodename, (const char *)rsi);
974		1127
975	send_reset (rsi);	1128	send_reset (rsi);
976	}	1129	}
977		1130
978	break;	1131	break;
979		1132
980	case vpn_packet::PT_AUTH_RES:	1133	case vpn_packet::PT_AUTH_RES:
981	{	1134	{
982	auth_res_packet *p = (auth_res_packet *) pkt;	1135	auth_res_packet *p = (auth_res_packet *)pkt;
983		1136
984	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1137	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
985		1138
986	if (p->chk_config ())	1139	auth_mac local_mac;
		1140	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1141
		1142	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
987	{	1143	{
988	if (p->prot_minor != PROTOCOL_MINOR)
989	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
990	conf->nodename, (const char *)rsi,
991	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
992
993	rsachallenge chg;
994
995	if (!rsa_cache.find (p->id, chg))
996	{
997	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1144	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
998	conf->nodename, (const char *)rsi);	1145	conf->nodename, (const char *)rsi);
999	break;
1000	}	1146	}
1001	else	1147	else if (!have_snd_auth)
1002	{	1148	{
1003	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1149	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1004		1150
1005	if (!p->hmac_chk (cctx))	1151	have_snd_auth = true;
1006	{
1007	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1008	"could be an attack, or just corruption or a synchronization error"),
1009	conf->nodename, (const char *)rsi);
1010	break;
1011	}
1012	else
1013	{
1014	rsaresponse h;
1015
1016	rsa_hash (p->id, chg, h);
1017
1018	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1019	{
1020	prot_minor = p->prot_minor;
1021
1022	delete ictx; ictx = cctx;
1023
1024	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1025
1026	si = rsi;
1027	protocol = rsi.prot;
1028
1029	connection_established ();	1152	connection_established (rsi);
1030
1031	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1032	conf->nodename, (const char *)rsi,
1033	p->prot_major, p->prot_minor);
1034
1035	if (::conf.script_node_up)
1036	if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1037	slog (L_WARN, _("node-up command execution failed, continuing."));
1038
1039	break;
1040	}
1041	else
1042	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1043	conf->nodename, (const char *)rsi);
1044	}
1045
1046	delete cctx;
1047	}
1048	}	1153	}
1049	}	1154	}
1050
1051	send_reset (rsi);
1052	break;	1155	break;
1053		1156
1054	case vpn_packet::PT_DATA_COMPRESSED:	1157	case vpn_packet::PT_DATA_COMPRESSED:
1055	#if !ENABLE_COMPRESSION	1158	#if !ENABLE_COMPRESSION
1056	send_reset (rsi);	1159	send_reset (rsi);
…		…
1062	if (ictx && octx)	1165	if (ictx && octx)
1063	{	1166	{
1064	vpndata_packet *p = (vpndata_packet *)pkt;	1167	vpndata_packet *p = (vpndata_packet *)pkt;
1065		1168
1066	if (!p->hmac_chk (ictx))	1169	if (!p->hmac_chk (ictx))
		1170	{
		1171	// rekeying often creates temporary hmac auth floods
		1172	// we assume they don't take longer than a few seconds normally,
		1173	// and suppress messages and resets during that time.
		1174	//TODO: should be done per source address
		1175	if (!hmac_error)
		1176	{
		1177	hmac_error = ev_now () + 3;
		1178	break;
		1179	}
		1180	else if (hmac_error >= ev_now ())
		1181	break; // silently suppress
		1182	else
		1183	{
1067	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1068	"could be an attack, or just corruption or a synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1069	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
		1187	// reset
		1188	}
		1189	}
1070	else	1190	else
1071	{	1191	{
1072	u32 seqno;	1192	u32 seqno;
1073	tap_packet *d = p->unpack (this, seqno);	1193	tap_packet *d = p->unpack (this, seqno);
		1194	int seqclass = iseqno.seqno_classify (seqno);
1074		1195
1075	if (iseqno.recv_ok (seqno))	1196	hmac_error = 0;
		1197
		1198	if (seqclass == 0) // ok
1076	{	1199	{
1077	vpn->tap->send (d);	1200	vpn->tap->send (d);
1078		1201
1079	if (si != rsi)	1202	if (si != rsi)
1080	{	1203	{
1081	// fast re-sync on source address changes, useful especially for tcp/ip	1204	// fast re-sync on source address changes, useful especially for tcp/ip
		1205	//if (last_si_change < ev_now () + 5.)
1082	si = rsi;	1206	// {
1083
1084	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1207	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1085	conf->nodename, (const char *)si, (const char *)rsi);	1208	conf->nodename, (const char *)si, (const char *)rsi);
		1209
		1210	si = rsi;
		1211
		1212	if (::conf.script_node_change)
		1213	{
		1214	run_script_cb *cb = new run_script_cb;
		1215	cb->set<connection, &connection::script_node_change> (this);
		1216	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1217	}
		1218
		1219	// }
		1220	//else
		1221	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1222	// conf->nodename, (const char *)si, (const char *)rsi);
1086	}	1223	}
		1224	}
		1225	else if (seqclass == 1) // far history
		1226	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1227	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1228	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1229	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1230	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1231	else if (seqclass == 3) // reset
		1232	{
		1233	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1234	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1235	send_reset (rsi);
1087	}	1236	}
1088		1237
1089	delete d;	1238	delete d;
1090	break;	1239	break;
1091	}	1240	}
…		…
1095	break;	1244	break;
1096		1245
1097	case vpn_packet::PT_CONNECT_REQ:	1246	case vpn_packet::PT_CONNECT_REQ:
1098	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1247	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1099	{	1248	{
1100	connect_req_packet *p = (connect_req_packet *) pkt;	1249	connect_req_packet *p = (connect_req_packet *)pkt;
1101		1250
1102	if (p->id > 0 && p->id <= vpn->conns.size ())	1251	if (p->id > 0 && p->id <= vpn->conns.size ())
1103	{	1252	{
1104	connection *c = vpn->conns[p->id - 1];	1253	connection *c = vpn->conns[p->id - 1];
1105	conf->protocols = p->protocols;	1254	conf->protocols = p->protocols;
1106		1255
1107	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1256	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1257	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1258	p->protocols,
1108	conf->id, p->id, c->ictx && c->octx);	1259	c->ictx && c->octx);
1109		1260
1110	if (c->ictx && c->octx)	1261	if (c->ictx && c->octx)
1111	{	1262	{
1112	// send connect_info packets to both sides, in case one is	1263	// send connect_info packets to both sides, in case one is
1113	// behind a nat firewall (or both ;)	1264	// behind a nat firewall (or both ;)
…		…
1136		1287
1137	c->conf->protocols = p->protocols;	1288	c->conf->protocols = p->protocols;
1138	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1289	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1139	p->si.upgrade_protocol (protocol, c->conf);	1290	p->si.upgrade_protocol (protocol, c->conf);
1140		1291
1141	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1292	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1142	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1293	conf->nodename,
		1294	vpn->conns[p->id - 1]->conf->nodename,
		1295	(const char *)p->si,
		1296	p->protocols,
		1297	protocol,
		1298	p->si.supported_protocols (c->conf),
		1299	!c->ictx && !c->octx);
1143		1300
1144	const sockinfo &dsi = forward_si (p->si);	1301	const sockinfo &dsi = forward_si (p->si);
1145		1302
1146	if (dsi.valid ())	1303	if (dsi.valid ())
1147	c->send_auth_request (dsi, true);	1304	c->send_auth_request (dsi, true);
		1305	else
		1306	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si);
1148	}	1309	}
1149	else	1310	else
1150	slog (L_WARN,	1311	slog (L_WARN,
1151	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1312	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1152	p->id);	1313	p->id);
…		…
1158	send_reset (rsi);	1319	send_reset (rsi);
1159	break;	1320	break;
1160	}	1321	}
1161	}	1322	}
1162		1323
		1324	inline void
1163	void connection::keepalive_cb (ev::timer &w, int revents)	1325	connection::keepalive_cb (ev::timer &w, int revents)
1164	{	1326	{
1165	if (ev::ev_now () >= last_activity + ::conf.keepalive + 30)	1327	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1328
		1329	if (when >= 0)
		1330	w.start (when);
		1331	else if (when < -15)
1166	{	1332	{
1167	reset_connection ();	1333	reset_connection ("keepalive overdue");
1168	establish_connection ();	1334	establish_connection ();
1169	}	1335	}
1170	else if (ev::ev_now () < last_activity + ::conf.keepalive)
1171	w.start (last_activity + ::conf.keepalive - ev::now ());
1172	else if (conf->connectmode != conf_node::C_ONDEMAND	1336	else if (conf->connectmode != conf_node::C_ONDEMAND
1173	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1337	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1174	{	1338	{
		1339	w.start (3);
1175	send_ping (si);	1340	send_ping (si);
1176	w.start (5);
1177	}	1341	}
1178	else if (ev::ev_now () < last_activity + ::conf.keepalive + 10)	1342	else if (when >= -10)
1179	// hold ondemand connections implicitly a few seconds longer	1343	// hold ondemand connections implicitly a few seconds longer
1180	// should delete octx, though, or something like that ;)	1344	// should delete octx, though, or something like that ;)
1181	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1345	w.start (when + 10);
1182	else	1346	else
1183	reset_connection ();	1347	reset_connection ("keepalive timeout");
1184	}	1348	}
1185		1349
		1350	void
1186	void connection::send_connect_request (int id)	1351	connection::send_connect_request (int id)
1187	{	1352	{
1188	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1353	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1189		1354
1190	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1355	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1356	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1357	THISNODE->protocols);
1191	p->hmac_set (octx);	1358	p->hmac_set (octx);
1192	send_vpn_packet (p, si);	1359	send_vpn_packet (p, si);
1193		1360
1194	delete p;	1361	delete p;
1195	}	1362	}
1196		1363
		1364	void
1197	void connection::script_init_env (const char *ext)	1365	connection::script_init_env (const char *ext)
1198	{	1366	{
1199	char *env;	1367	char *env;
1200	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1368	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1201	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1369	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1202	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1370	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1203	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1371	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1204	conf->id & 0xff); putenv (env);	1372	conf->id & 0xff); putenv (env);
1205	}	1373	}
1206		1374
		1375	void
1207	void connection::script_init_connect_env ()	1376	connection::script_init_connect_env ()
1208	{	1377	{
1209	vpn->script_init_env ();	1378	vpn->script_init_env ();
1210		1379
1211	char *env;	1380	char *env;
1212	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1381	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1382	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1213	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1383	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1214	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1384	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1215	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1385	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1216	}	1386	}
1217		1387
		1388	inline const char *
1218	const char *connection::script_node_up ()	1389	connection::script_node_up ()
1219	{	1390	{
1220	script_init_connect_env ();	1391	script_init_connect_env ();
1221		1392
1222	putenv ((char *)"STATE=up");	1393	putenv ((char *)"STATE=up");
1223		1394
…		…
1228	::conf.script_node_up ? ::conf.script_node_up : "node-up");	1399	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1229		1400
1230	return filename;	1401	return filename;
1231	}	1402	}
1232		1403
		1404	inline const char *
		1405	connection::script_node_change ()
		1406	{
		1407	script_init_connect_env ();
		1408
		1409	putenv ((char *)"STATE=change");
		1410
		1411	char *filename;
		1412	asprintf (&filename,
		1413	"%s/%s",
		1414	confbase,
		1415	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1416
		1417	return filename;
		1418	}
		1419
		1420	inline const char *
1233	const char *connection::script_node_down ()	1421	connection::script_node_down ()
1234	{	1422	{
1235	script_init_connect_env ();	1423	script_init_connect_env ();
1236		1424
1237	putenv ((char *)"STATE=down");	1425	putenv ((char *)"STATE=down");
1238		1426
…		…
1244		1432
1245	return filename;	1433	return filename;
1246	}	1434	}
1247		1435
1248	connection::connection (struct vpn *vpn, conf_node *conf)	1436	connection::connection (struct vpn *vpn, conf_node *conf)
1249	: vpn(vpn), conf(conf)	1437	: vpn(vpn), conf(conf),
1250	, rekey (this, &connection::rekey_cb)
1251	, keepalive (this, &connection::keepalive_cb)
1252	, establish_connection (this, &connection::establish_connection_cb)
1253	#if ENABLE_DNS	1438	#if ENABLE_DNS
1254	, dns (0)	1439	dns (0),
1255	#endif	1440	#endif
		1441	data_queue(conf->max_ttl, conf->max_queue + 1),
		1442	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1256	{	1443	{
		1444	rekey .set<connection, &connection::rekey_cb > (this);
		1445	keepalive .set<connection, &connection::keepalive_cb > (this);
		1446	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1447
		1448	last_establish_attempt = 0.;
1257	octx = ictx = 0;	1449	octx = ictx = 0;
1258	retry_cnt = 0;
1259		1450
1260	if (!conf->protocols) // make sure some protocol is enabled	1451	connectmode = conf->connectmode;
1261	conf->protocols = PROT_UDPv4;
1262		1452
1263	connectmode = conf_node::C_ALWAYS; // initial setting	1453	// queue a dummy packet to force an initial connection attempt
		1454	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1455	vpn_queue.put (new net_packet);
		1456
1264	reset_connection ();	1457	reset_connection ("startup");
1265	}	1458	}
1266		1459
1267	connection::~connection ()	1460	connection::~connection ()
1268	{	1461	{
1269	shutdown ();	1462	shutdown ();
1270	}	1463	}
1271		1464
		1465	void
1272	void connection_init ()	1466	connection_init ()
1273	{	1467	{
1274	auth_rate_limiter.clear ();	1468	auth_rate_limiter.clear ();
1275	reset_rate_limiter.clear ();	1469	reset_rate_limiter.clear ();
1276	}	1470	}
1277		1471

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