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

Comparing gvpe/src/connection.C (file contents):
Revision 1.49 by pcg, Sat Mar 12 18:10:40 2005 UTC vs.
Revision 1.113 by root, Thu Jan 29 00:21:39 2015 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) require (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
48		61
49	#define ULTRA_FAST 1	62	#define ULTRA_FAST 1
50	#define HLOG 15	63	#define HLOG 15
51	#include "lzf/lzf.h"	64	#include "lzf/lzf.h"
52	#include "lzf/lzf_c.c"	65	#include "lzf/lzf_c.c"
53	#include "lzf/lzf_d.c"	66	#include "lzf/lzf_d.c"
54		67
		68	//////////////////////////////////////////////////////////////////////////////
		69
		70	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		71	static ev::child rs_child_ev;
		72
		73	namespace
		74	{
		75	void // c++ requires external linkage here, apparently :(
		76	rs_child_cb (ev::child &w, int revents)
		77	{
		78	w.stop ();
		79
		80	if (rs_queue.empty ())
		81	return;
		82
		83	pid_t pid = run_script (*rs_queue.front ().first, false);
		84	if (pid)
		85	{
		86	w.set (pid);
		87	w.start ();
		88	}
		89	else
		90	slog (L_WARN, rs_queue.front ().second);
		91
		92	delete rs_queue.front ().first;
		93	rs_queue.pop ();
		94	}
		95	};
		96
		97	// despite the fancy name, this is quite a hack
		98	static void
		99	run_script_queued (run_script_cb cb, const char warnmsg)
		100	{
		101	rs_queue.push (std::make_pair (cb, warnmsg));
		102
		103	if (!rs_child_ev.is_active ())
		104	{
		105	rs_child_ev.set<rs_child_cb> ();
		106	rs_child_ev ();
		107	}
		108	}
		109
		110	//////////////////////////////////////////////////////////////////////////////
		111
55	struct crypto_ctx	112	struct crypto_ctx
56	{	113	{
57	EVP_CIPHER_CTX cctx;	114	EVP_CIPHER_CTX cctx;
58	HMAC_CTX hctx;	115	HMAC_CTX hctx;
59		116
60	crypto_ctx (const rsachallenge &challenge, int enc);	117	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
61	~crypto_ctx ();	118	~crypto_ctx ();
62	};	119	};
63		120
64	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	121	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
65	{	122	{
		123	ecdh_key s;
		124
		125	curve25519_combine (a, b, s);
		126
		127	{
		128	u8 mac_key[MAC_KEYSIZE];
		129	static const unsigned char mac_info[] = "gvpe mac key";
		130
		131	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		132	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		133	kdf.extract (s, sizeof (s));
		134	kdf.extract_done (HKDF_PRF_HASH ());
		135	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		136
		137	HMAC_CTX_init (&hctx);
		138	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		139	}
		140
		141	{
		142	u8 cipher_key[CIPHER_KEYSIZE];
		143	static const unsigned char cipher_info[] = "gvpe cipher key";
		144
		145	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		146	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		147	kdf.extract (s, sizeof (s));
		148	kdf.extract_done (HKDF_PRF_HASH ());
		149	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		150
66	EVP_CIPHER_CTX_init (&cctx);	151	EVP_CIPHER_CTX_init (&cctx);
67	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	152	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
68	HMAC_CTX_init (&hctx);	153	}
69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
70	}	154	}
71		155
72	crypto_ctx::~crypto_ctx ()	156	crypto_ctx::~crypto_ctx ()
73	{	157	{
74	require (EVP_CIPHER_CTX_cleanup (&cctx));	158	require (EVP_CIPHER_CTX_cleanup (&cctx));
75	HMAC_CTX_cleanup (&hctx);	159	HMAC_CTX_cleanup (&hctx);
76	}	160	}
77		161
		162	static inline void
		163	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		164	{
		165	if (RSA_public_encrypt (sizeof (auth.rsa),
		166	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		167	key, RSA_PKCS1_OAEP_PADDING) < 0)
		168	fatal ("RSA_public_encrypt error");
		169
		170	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		171	}
		172
		173	static inline bool
		174	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		175	{
		176	u8 rsa_decrypt[RSA_KEYLEN];
		177
		178	if (RSA_private_decrypt (sizeof (encr.rsa),
		179	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		180	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		181	return 0;
		182
		183	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		184	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		185
		186	return 1;
		187	}
		188
78	static void	189	static void
79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	190	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
80	{	191	{
81	EVP_MD_CTX ctx;	192	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
82		193	kdf.extract (&auth.rsa, sizeof (auth.rsa));
83	EVP_MD_CTX_init (&ctx);	194	kdf.extract_done ();
84	require (EVP_DigestInit (&ctx, RSA_HASH));	195	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	}	196	}
90		197
91	struct rsa_entry {	198	void
92	tstamp expire;	199	connection::generate_auth_data ()
93	rsaid id;
94	rsachallenge chg;
95	};
96
97	struct rsa_cache : list<rsa_entry>
98	{	200	{
99	void cleaner_cb (time_watcher &w); time_watcher cleaner;	201	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	{ }	202	{
		203	// request data
		204	rand_fill (snd_auth.rsa);
		205	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
140		206
141	} rsa_cache;	207	// eventual response data
142		208	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
143	void rsa_cache::cleaner_cb (time_watcher &w)
144	{
145	if (!empty ())
146	{	209	}
147	w.start (NOW + RSA_TTL);
148		210
149	for (iterator i = begin (); i != end (); )	211	// every use prolongs the expiry
150	if (i->expire <= NOW)	212	auth_expire = ev_now () + AUTH_TTL;
151	i = erase (i);
152	else
153	++i;
154	}
155	}	213	}
156		214
157	//////////////////////////////////////////////////////////////////////////////	215	//////////////////////////////////////////////////////////////////////////////
158		216
159	void pkt_queue::put (net_packet *p)	217	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		218	: max_ttl (max_ttl), max_queue (max_queue)
160	{	219	{
161	if (queue[i])	220	queue = new pkt [max_queue];
162	{
163	delete queue[i];
164	j = (j + 1) % QUEUEDEPTH;
165	}
166		221
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;	222	i = 0;
189	j = 0;	223	j = 0;
		224
		225	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190	}	226	}
191		227
192	pkt_queue::~pkt_queue ()	228	pkt_queue::~pkt_queue ()
193	{	229	{
194	for (i = QUEUEDEPTH; --i > 0; )	230	while (net_packet *p = get ())
		231	delete p;
		232
195	delete queue[i];	233	delete [] queue;
196	}	234	}
197		235
		236	void
		237	pkt_queue::expire_cb (ev::timer &w, int revents)
		238	{
		239	ev_tstamp expire = ev_now () - max_ttl;
		240
		241	for (;;)
		242	{
		243	if (empty ())
		244	break;
		245
		246	double diff = queue[j].tstamp - expire;
		247
		248	if (diff >= 0.)
		249	{
		250	w.start (diff > 0.5 ? diff : 0.5);
		251	break;
		252	}
		253
		254	delete get ();
		255	}
		256	}
		257
		258	void
		259	pkt_queue::put (net_packet *p)
		260	{
		261	ev_tstamp now = ev_now ();
		262
		263	// start expiry timer
		264	if (empty ())
		265	expire.start (max_ttl);
		266
		267	int ni = i + 1 == max_queue ? 0 : i + 1;
		268
		269	if (ni == j)
		270	delete get ();
		271
		272	queue[i].pkt = p;
		273	queue[i].tstamp = now;
		274
		275	i = ni;
		276	}
		277
		278	net_packet *
		279	pkt_queue::get ()
		280	{
		281	if (empty ())
		282	return 0;
		283
		284	net_packet *p = queue[j].pkt;
		285	queue[j].pkt = 0;
		286
		287	j = j + 1 == max_queue ? 0 : j + 1;
		288
		289	return p;
		290	}
		291
198	struct net_rateinfo {	292	struct net_rateinfo
		293	{
199	u32 host;	294	u32 host;
200	double pcnt, diff;	295	double pcnt, diff;
201	tstamp last;	296	tstamp last;
202	};	297	};
203		298
213		308
214	bool can (const sockinfo &si) { return can((u32)si.host); }	309	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	310	bool can (u32 host);
216	};	311	};
217		312
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	313	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		314
		315	bool
220	bool net_rate_limiter::can (u32 host)	316	net_rate_limiter::can (u32 host)
221	{	317	{
222	iterator i;	318	iterator i;
223		319
224	for (i = begin (); i != end (); )	320	for (i = begin (); i != end (); )
225	if (i->host == host)	321	if (i->host == host)
226	break;	322	break;
227	else if (i->last < NOW - NRL_EXPIRE)	323	else if (i->last < ev_now () - NRL_EXPIRE)
228	i = erase (i);	324	i = erase (i);
229	else	325	else
230	i++;	326	i++;
231		327
232	if (i == end ())	328	if (i == end ())
…		…
234	net_rateinfo ri;	330	net_rateinfo ri;
235		331
236	ri.host = host;	332	ri.host = host;
237	ri.pcnt = 1.;	333	ri.pcnt = 1.;
238	ri.diff = NRL_MAXDIF;	334	ri.diff = NRL_MAXDIF;
239	ri.last = NOW;	335	ri.last = ev_now ();
240		336
241	push_front (ri);	337	push_front (ri);
242		338
243	return true;	339	return true;
244	}	340	}
…		…
246	{	342	{
247	net_rateinfo ri (*i);	343	net_rateinfo ri (*i);
248	erase (i);	344	erase (i);
249		345
250	ri.pcnt = ri.pcnt * NRL_ALPHA;	346	ri.pcnt = ri.pcnt * NRL_ALPHA;
251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	347	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252		348
253	ri.last = NOW;	349	ri.last = ev_now ();
254		350
255	double dif = ri.diff / ri.pcnt;	351	double dif = ri.diff / ri.pcnt;
256		352
257	bool send = dif > NRL_CUTOFF;	353	bool send = dif > NRL_CUTOFF;
258		354
…		…
270	}	366	}
271	}	367	}
272		368
273	/////////////////////////////////////////////////////////////////////////////	369	/////////////////////////////////////////////////////////////////////////////
274		370
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	371	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	372	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
278	{	373	{
279	unsigned int xlen;
280
281	HMAC_CTX *hctx = &ctx->hctx;	374	HMAC_CTX *hctx = &ctx->hctx;
282		375
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);	376	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	377	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
285	len - sizeof (hmac_packet));	378	require101 (HMAC_Final (hctx, hmac_digest, 0));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	379	}
288		380
289	void	381	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	382	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	383	{
292	hmac_gen (ctx);	384	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		385	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	386	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	387	}
296		388
297	bool	389	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	390	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	391	{
300	hmac_gen (ctx);	392	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		393	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	394	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	395	}
304		396
		397	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	398	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	399	{
307	type = type_;	400	type = type_;
308		401
309	int src = THISNODE->id;	402	int src = THISNODE->id;
310		403
…		…
312	srcdst = ((src >> 8) << 4) \| (dst >> 8);	405	srcdst = ((src >> 8) << 4) \| (dst >> 8);
313	dst1 = dst;	406	dst1 = dst;
314	}	407	}
315		408
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	409	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		410
319	struct vpndata_packet : vpn_packet	411	struct vpndata_packet : vpn_packet
		412	{
		413	u32 ctr; // seqno
		414	u8 data[MAXVPNDATA];
		415
		416	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		417	tap_packet unpack (connection conn, u32 &seqno);
		418
		419	private:
		420	const u32 data_hdr_size () const
320	{	421	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno	422	// the distance from beginning of packet to data member
322		423	return data - at (0);
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;
330	}
331	};	424	}
		425	};
		426
		427	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		428	static unsigned char *
		429	expand_iv (u32 ctr)
		430	{
		431	static u32 iv[IV_SIZE (CIPHER) / 4];
		432
		433	require (sizeof (iv) == 4 * 4);
		434	require (IV_SIZE (CIPHER) % 4 == 0);
		435
		436	iv[0] =
		437	iv[1] =
		438	iv[2] = ctr;
		439
		440	// I would reuse ctr here to to avoid potential endianness issues,
		441	// but it seems openssl wraps around. While this would be still ok,
		442	// and I don't even know if its true, let's play safe and initialise
		443	// to 0.
		444	iv[3] = 0;
		445
		446	return (unsigned char *)iv;
		447	}
332		448
333	void	449	void
334	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	450	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
335	{	451	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	452	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
338	ptype type = PT_DATA_UNCOMPRESSED;	454	ptype type = PT_DATA_UNCOMPRESSED;
339		455
340	#if ENABLE_COMPRESSION	456	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	457	u8 cdata[MAX_MTU];
342		458
343	if (conn->features & ENABLE_COMPRESSION)	459	if (conn->features & FEATURE_COMPRESSION)
344	{	460	{
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	461	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
346		462
347	if (cl)	463	if (cl)
348	{	464	{
…		…
354	d[1] = cl;	470	d[1] = cl;
355	}	471	}
356	}	472	}
357	#endif	473	#endif
358		474
		475	ctr = htonl (seqno);
		476
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	477	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
360
361	struct {
362	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];
364	#endif
365	u32 seqno;
366	} datahdr;
367
368	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
371	#endif
372		478
373	require (EVP_EncryptUpdate (cctx,	479	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	480	(unsigned char *)data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	481	(unsigned char *)d, l));
376	outl += outl2;	482	outl += outl2;
377		483
378	require (EVP_EncryptUpdate (cctx,	484	// it seems this is a nop for us, but we do it anyways
379	(unsigned char *) data + outl, &outl2,	485	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
380	(unsigned char *) d, l));
381	outl += outl2;	486	outl += outl2;
382		487
383	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
384	outl += outl2;
385
386	len = outl + data_hdr_size ();	488	len = data_hdr_size () + outl;
387		489
388	set_hdr (type, dst);	490	set_hdr (type, dst);
389		491
390	hmac_set (conn->octx);	492	hmac_set (conn->octx);
391	}	493	}
…		…
395	{	497	{
396	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	498	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;
397	int outl = 0, outl2;	499	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	500	tap_packet *p = new tap_packet;
399	u8 *d;	501	u8 *d;
400	u32 l = len - data_hdr_size ();
401		502
		503	seqno = ntohl (ctr);
		504
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	505	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
403		506
404	#if ENABLE_COMPRESSION	507	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	508	u8 cdata[MAX_MTU];
406		509
407	if (type == PT_DATA_COMPRESSED)	510	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	511	d = cdata;
409	else	512	else
410	#endif	513	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	514	d = &(*p)[6 + 6];
412		515
413	/* this overwrites part of the src mac, but we fix that later */	516	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	518	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	519	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	520	outl += outl2;
418		521
		522	// it seems this is a nop for us, but we do it anyways
419	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	523	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
420	outl += outl2;	524	outl += outl2;
421		525
422	seqno = ntohl ((u32 )(d + RAND_SIZE));
423
424	id2mac (dst () ? dst() : THISNODE->id, p->dst);	526	id2mac (dst () ? dst() : THISNODE->id, p->dst);
425	id2mac (src (), p->src);	527	id2mac (src (), p->src);
426		528
427	#if ENABLE_COMPRESSION	529	#if ENABLE_COMPRESSION
428	if (type == PT_DATA_COMPRESSED)	530	if (type == PT_DATA_COMPRESSED)
429	{	531	{
430	u32 cl = (d[DATAHDR] << 8) \| d[DATAHDR + 1];	532	u32 cl = (d[0] << 8) \| d[1];
431		533
432	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	534	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
433	&(*p)[6 + 6], MAX_MTU)	535	&(*p)[6 + 6], MAX_MTU)
434	+ 6 + 6;	536	+ 6 + 6;
435	}	537	}
436	else	538	else
437	p->len = outl + (6 + 6 - DATAHDR);	539	p->len = outl + (6 + 6);
438	#endif	540	#endif
439		541
440	return p;	542	return p;
441	}	543	}
442		544
…		…
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;
482	hmaclen = HMACLENGTH;
483	flags = 0;	585	flags = 0;
484	challengelen = sizeof (rsachallenge);
485	features = get_features ();	586	features = get_features ();
486		587
		588	strncpy ((char *)serial, conf.serial, sizeof (serial));
		589
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	590	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	hmac_nid = htonl (EVP_MD_type (DIGEST));	591	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		592	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
490		593
491	len = sizeof (*this) - sizeof (net_packet);	594	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	595	set_hdr (type, dst);
493	}	596	}
494		597
495	bool config_packet::chk_config () const	598	bool
		599	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
496	{	600	{
497	if (prot_major != PROTOCOL_MAJOR)	601	if (prot_major != PROTOCOL_MAJOR)
498	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	602	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
499	else if (randsize != RAND_SIZE)	603	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
500	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
501	else if (hmaclen != HMACLENGTH)
502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503	else if (challengelen != sizeof (rsachallenge))
504	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
505	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	604	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
506	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	605	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
507	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	606	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
508	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
509	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	607	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
510	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	608	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		609	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		610	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		611	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		612	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
511	else	613	else
		614	{
		615	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		616
		617	if (cmp > 0)
		618	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		619	conf->nodename, (const char *)rsi);
		620	else if (cmp == 0)
512	return true;	621	return true;
		622	}
513		623
514	return false;	624	return false;
515	}	625	}
516		626
517	struct auth_req_packet : config_packet	627	struct auth_req_packet : config_packet // UNPROTECTED
518	{	628	{
519	char magic[8];	629	char magic[8];
520	u8 initiate; // false if this is just an automatic reply	630	u8 initiate; // false if this is just an automatic reply
521	u8 protocols; // supported protocols (will be patched on forward)	631	u8 protocols; // supported protocols (will be patched on forward)
522	u8 pad2, pad3;	632	u8 pad2, pad3;
523	rsaid id;	633	auth_encr encr;
524	rsaencrdata encr;
525		634
526	auth_req_packet (int dst, bool initiate_, u8 protocols_)	635	auth_req_packet (int dst, bool initiate_, u8 protocols_)
527	{	636	{
528	config_packet::setup (PT_AUTH_REQ, dst);	637	config_packet::setup (PT_AUTH_REQ, dst);
529	strncpy (magic, MAGIC, 8);	638	memcpy (magic, MAGIC, 8);
530	initiate = !!initiate_;	639	initiate = !!initiate_;
531	protocols = protocols_;	640	protocols = protocols_;
532		641
533	len = sizeof (*this) - sizeof (net_packet);	642	len = sizeof (*this) - sizeof (net_packet);
534	}	643	}
535	};	644	};
536		645
537	struct auth_res_packet : config_packet	646	struct auth_res_packet : vpn_packet // UNPROTECTED
538	{	647	{
539	rsaid id;
540	u8 pad1, pad2, pad3;
541	u8 response_len; // encrypted length
542	rsaresponse response;	648	auth_response response;
543		649
544	auth_res_packet (int dst)	650	auth_res_packet (int dst)
545	{	651	{
546	config_packet::setup (PT_AUTH_RES, dst);	652	set_hdr (PT_AUTH_RES, dst);
547		653
548	len = sizeof (*this) - sizeof (net_packet);	654	len = sizeof (*this) - sizeof (net_packet);
549	}	655	}
550	};	656	};
551		657
…		…
581	};	687	};
582		688
583	/////////////////////////////////////////////////////////////////////////////	689	/////////////////////////////////////////////////////////////////////////////
584		690
585	void	691	void
586	connection::connection_established ()	692	connection::connection_established (const sockinfo &rsi)
587	{	693	{
588	if (ictx && octx)	694	if (!have_snd_auth \|\| !have_rcv_auth)
		695	return;
		696
		697	si = rsi;
		698	protocol = rsi.prot;
		699
		700	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		701	conf->nodename, (const char *)rsi,
		702	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		703	PROTOCOL_MAJOR, prot_minor);
		704
		705	if (::conf.script_node_up)
		706	{
		707	run_script_cb *cb = new run_script_cb;
		708	cb->set<connection, &connection::script_node_up> (this);
		709	run_script_queued (cb, _("node-up command execution failed, continuing."));
589	{	710	}
590	connectmode = conf->connectmode;	711
		712	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		713	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
591		714
		715	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		716	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		717
592	// make sure rekeying timeouts are slightly asymmetric	718	// make sure rekeying timeouts are slightly asymmetric
593	rekey.start (NOW + ::conf.rekey	719	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
594	+ (conf->id > THISNODE->id ? 10 : 0));	720	rekey.start (rekey_interval, rekey_interval);
		721
		722	hmac_error = 0.;
		723
595	keepalive.start (NOW + ::conf.keepalive);	724	keepalive.start (::conf.keepalive);
596		725
597	// send queued packets	726	// send queued packets
598	if (ictx && octx)
599	{
600	while (tap_packet p = (tap_packet )data_queue.get ())	727	while (tap_packet p = (tap_packet )data_queue.get ())
601	{	728	{
602	send_data_packet (p);	729	if (p->len) send_data_packet (p);
603	delete p;	730	delete p;
604	}	731	}
605		732
606	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	733	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
607	{	734	{
608	send_vpn_packet (p, si, IPTOS_RELIABILITY);	735	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
609	delete p;	736	delete p;
610	}
611	}
612	}	737	}
		738
		739	vpn->connection_established (this);
		740	}
		741
		742	void
		743	connection::reset_si ()
		744	{
		745	if (vpn->can_direct (THISNODE, conf))
		746	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
613	else	747	else
614	{	748	{
615	retry_cnt = 0;	749	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
616	establish_connection.start (NOW + 5);	750	protocol = 0;
617	keepalive.stop ();
618	rekey.stop ();
619	}	751	}
620	}
621
622	void
623	connection::reset_si ()
624	{
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);
626
627	// mask out protocols we cannot establish
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
630	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
631		752
632	si.set (conf, protocol);	753	si.set (conf, protocol);
633	}	754	}
634		755
635	// ensure sockinfo is valid, forward if necessary	756	// ensure sockinfo is valid, forward if necessary
636	const sockinfo &	757	const sockinfo &
637	connection::forward_si (const sockinfo &si) const	758	connection::forward_si (const sockinfo &si) const
638	{	759	{
639	if (!si.valid ())	760	if (!si.valid ())
640	{	761	{
641	connection *r = vpn->find_router ();	762	connection *r = vpn->find_router_for (this);
642		763
643	if (r)	764	if (r)
644	{	765	{
645	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	766	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
646	conf->nodename, r->conf->nodename, (const char *)r->si);	767	conf->nodename, r->conf->nodename);
647	return r->si;	768	return r->si;
648	}	769	}
649	else	770	else
650	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	771	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
651	conf->nodename);	772	conf->nodename);
652	}	773	}
653		774
654	return si;	775	return si;
655	}	776	}
656		777
657	void	778	void
658	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	779	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
659	{	780	{
660	if (!vpn->send_vpn_packet (pkt, si, tos))	781	if (!vpn->send_vpn_packet (pkt, si, tos))
661	reset_connection ();	782	reset_connection ("packet send error");
662	}	783	}
663		784
664	void	785	void
665	connection::send_ping (const sockinfo &si, u8 pong)	786	connection::send_ping (const sockinfo &si, u8 pong)
666	{	787	{
667	ping_packet *pkt = new ping_packet;	788	ping_packet *pkt = new ping_packet;
668		789
669	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	790	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		791
		792	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
670	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	793	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
671		794
672	delete pkt;	795	delete pkt;
673	}	796	}
674		797
…		…
689	void	812	void
690	connection::send_auth_request (const sockinfo &si, bool initiate)	813	connection::send_auth_request (const sockinfo &si, bool initiate)
691	{	814	{
692	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	815	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
693		816
694	rsachallenge chg;	817	generate_auth_data ();
695	rsa_cache.gen (pkt->id, chg);
696	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	818	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
697		819
698	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	820	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
699
700	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	821	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
701		822
702	delete pkt;	823	delete pkt;
703	}	824	}
704		825
705	void	826	void
706	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	827	connection::send_auth_response (const sockinfo &si)
707	{	828	{
708	auth_res_packet *pkt = new auth_res_packet (conf->id);	829	auth_res_packet *pkt = new auth_res_packet (conf->id);
709		830
710	pkt->id = id;	831	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		832	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
711		833
712	rsa_hash (id, chg, pkt->response);
713
714	pkt->hmac_set (octx);
715
716	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	834	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
717
718	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	835	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
719		836
720	delete pkt;	837	delete pkt;
721	}	838	}
722		839
723	void	840	void
724	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	841	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
725	{	842	{
726	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	843	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
727	conf->id, rid, (const char *)rsi);	844	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		845	conf->protocols);
728		846
729	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	847	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
730		848
731	r->hmac_set (octx);	849	r->hmac_set (octx);
732	send_vpn_packet (r, si);	850	send_vpn_packet (r, si);
733		851
734	delete r;	852	delete r;
735	}	853	}
736		854
737	void	855	inline void
738	connection::establish_connection_cb (time_watcher &w)	856	connection::establish_connection_cb (ev::timer &w, int revents)
739	{	857	{
740	if (!ictx	858	if (!(ictx && octx)
741	&& conf != THISNODE	859	&& conf != THISNODE
742	&& connectmode != conf_node::C_NEVER	860	&& connectmode != conf_node::C_NEVER
743	&& connectmode != conf_node::C_DISABLED	861	&& connectmode != conf_node::C_DISABLED
744	&& NOW > w.at)	862	&& !w.is_active ())
745	{	863	{
746	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	864	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		865	// and stop trying. should probably be handled by a per-connection expire handler.
		866	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		867	{
		868	reset_connection ("no demand");
		869	return;
		870	}
747		871
748	double retry_int = double (retry_cnt & 3	872	last_establish_attempt = ev_now ();
		873
		874	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
749	? (retry_cnt & 3) + 1	875	? (retry_cnt & 3) + 1
750	: 1 << (retry_cnt >> 2));	876	: 1 << (retry_cnt >> 2));
751		877
752	reset_si ();	878	reset_si ();
753		879
754	bool slow = si.prot & PROT_SLOW;	880	bool slow = (si.prot & PROT_SLOW) \|\| (conf->low_power \|\| THISNODE->low_power);
755		881
756	if (si.prot && !si.host)	882	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		883	{
		884	/TODO/ /* start the timer so we don't recurse endlessly */
		885	w.start (1);
757	vpn->send_connect_request (conf->id);	886	vpn->send_connect_request (this);
		887	}
758	else	888	else
759	{	889	{
		890	if (si.valid ())
		891	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		892	conf->nodename, (const char *)si);
		893
760	const sockinfo &dsi = forward_si (si);	894	const sockinfo &dsi = forward_si (si);
761		895
762	slow = slow \|\| (dsi.prot & PROT_SLOW);	896	slow = slow \|\| (dsi.prot & PROT_SLOW);
763		897
764	if (dsi.valid () && auth_rate_limiter.can (dsi))	898	if (dsi.valid () && auth_rate_limiter.can (dsi))
765	{	899	{
766	if (retry_cnt < 4)	900	// use ping after the first few retries
		901	// TODO: on rekeys, the other node might not interpret ping correctly,
		902	// TODO: as it will still have a valid connection
		903	if (retry_cnt < 4 && (!conf->low_power \|\| THISNODE->low_power))
767	send_auth_request (dsi, true);	904	send_auth_request (dsi, true);
768	else	905	else
769	send_ping (dsi, 0);	906	send_ping (dsi, 0);
770	}	907	}
771	}	908	}
772		909
773	retry_int *= slow ? 8. : 0.7;	910	retry_int *= slow ? 4. : 0.9;
774		911
775	if (retry_int < conf->max_retry)	912	if (retry_int < conf->max_retry)
776	retry_cnt++;	913	retry_cnt++;
777	else	914	else
778	retry_int = conf->max_retry;	915	retry_int = conf->max_retry;
779		916
780	w.start (NOW + retry_int);	917	w.start (retry_int);
781	}	918	}
782	}	919	}
783		920
784	void	921	void
785	connection::reset_connection ()	922	connection::reset_connection (const char *reason)
786	{	923	{
787	if (ictx && octx)	924	if (ictx && octx)
788	{	925	{
789	slog (L_INFO, _("%s(%s): connection lost"),	926	slog (L_INFO, _("%s(%s): connection lost (%s)"),
790	conf->nodename, (const char *)si);	927	conf->nodename, (const char *)si, reason);
791		928
792	if (::conf.script_node_down)	929	if (::conf.script_node_down)
793	run_script (run_script_cb (this, &connection::script_node_down), false);	930	{
		931	run_script_cb *cb = new run_script_cb;
		932	cb->set<connection, &connection::script_node_down> (this);
		933	run_script_queued (cb, _("node-down command execution failed, continuing."));
		934	}
794	}	935	}
795		936
796	delete ictx; ictx = 0;	937	delete ictx; ictx = 0;
797	delete octx; octx = 0;	938	delete octx; octx = 0;
798	#if ENABLE_DNS
799	dnsv4_reset_connection ();
800	#endif
801		939
802	si.host = 0;	940	si.host = 0;
803		941
		942	have_snd_auth = false;
		943	have_rcv_auth = false;
		944	auth_expire = 0.;
		945
804	last_activity = 0;	946	last_activity = 0.;
		947	//last_si_change = 0.;
805	retry_cnt = 0;	948	retry_cnt = 0;
806		949
807	rekey.stop ();	950	rekey.stop ();
808	keepalive.stop ();	951	keepalive.stop ();
809	establish_connection.stop ();	952	establish_connection.stop ();
…		…
813	connection::shutdown ()	956	connection::shutdown ()
814	{	957	{
815	if (ictx && octx)	958	if (ictx && octx)
816	send_reset (si);	959	send_reset (si);
817		960
818	reset_connection ();	961	reset_connection ("shutdown");
819	}	962	}
820		963
821	void	964	// poor-man's rekeying
822	connection::rekey_cb (time_watcher &w)	965	inline void
		966	connection::rekey_cb (ev::timer &w, int revents)
823	{	967	{
824	reset_connection ();	968	reset_connection ("rekeying");
825	establish_connection ();	969	establish_connection ();
826	}	970	}
827		971
828	void	972	void
829	connection::send_data_packet (tap_packet *pkt)	973	connection::send_data_packet (tap_packet *pkt)
…		…
843	if (oseqno > MAX_SEQNO)	987	if (oseqno > MAX_SEQNO)
844	rekey ();	988	rekey ();
845	}	989	}
846		990
847	void	991	void
		992	connection::post_inject_queue ()
		993	{
		994	// force a connection every now and when when packets are sent (max 1/s)
		995	if (ev_now () - last_establish_attempt >= (conf->low_power \|\| THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		996	establish_connection.stop ();
		997
		998	establish_connection ();
		999	}
		1000
		1001	void
848	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	1002	connection::inject_data_packet (tap_packet *pkt)
849	{	1003	{
850	if (ictx && octx)	1004	if (ictx && octx)
851	send_data_packet (pkt);	1005	send_data_packet (pkt);
852	else	1006	else
853	{	1007	{
854	if (!broadcast)//DDDD
855	data_queue.put (new tap_packet (*pkt));	1008	data_queue.put (new tap_packet (*pkt));
856		1009	post_inject_queue ();
857	establish_connection ();
858	}	1010	}
859	}	1011	}
860		1012
		1013	void
861	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1014	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
862	{	1015	{
863	if (ictx && octx)	1016	if (ictx && octx)
864	send_vpn_packet (pkt, si, tos);	1017	send_vpn_packet (pkt, si, tos);
865	else	1018	else
866	{	1019	{
867	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1020	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
868		1021	post_inject_queue ();
869	establish_connection ();
870	}	1022	}
871	}	1023	}
872		1024
873	void	1025	void
874	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1026	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
875	{	1027	{
876	last_activity = NOW;	1028	last_activity = ev_now ();
877		1029
878	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1030	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
879	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1031	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1032
		1033	if (connectmode == conf_node::C_DISABLED)
		1034	return;
880		1035
881	switch (pkt->typ ())	1036	switch (pkt->typ ())
882	{	1037	{
883	case vpn_packet::PT_PING:	1038	case vpn_packet::PT_PING:
		1039	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1040
884	// we send pings instead of auth packets after some retries,	1041	// we send pings instead of auth packets after some retries,
885	// so reset the retry counter and establish a connection	1042	// so reset the retry counter and establish a connection
886	// when we receive a ping.	1043	// when we receive a ping.
887	if (!ictx)	1044	if (!ictx)
888	{	1045	{
889	if (auth_rate_limiter.can (rsi))	1046	if (auth_rate_limiter.can (rsi))
890	send_auth_request (rsi, true);	1047	send_auth_request (rsi, true);
891	}	1048	}
892	else	1049	else
		1050	// we would love to change the socket address here, but ping's aren't
		1051	// authenticated, so we best ignore it.
893	send_ping (rsi, 1); // pong	1052	send_ping (rsi, 1); // pong
894		1053
895	break;	1054	break;
896		1055
897	case vpn_packet::PT_PONG:	1056	case vpn_packet::PT_PONG:
		1057	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1058
		1059	// a PONG might mean that the other side doesn't really know
		1060	// about our desire for communication.
		1061	establish_connection ();
898	break;	1062	break;
899		1063
900	case vpn_packet::PT_RESET:	1064	case vpn_packet::PT_RESET:
		1065	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1066
		1067	if (ictx && octx)
901	{	1068	{
902	reset_connection ();	1069	reset_connection ("remote reset");
903		1070
904	config_packet p = (config_packet ) pkt;	1071	config_packet p = (config_packet ) pkt;
905		1072
906	if (!p->chk_config ())	1073	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
907	{
908	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
909	conf->nodename, (const char *)rsi);
910	connectmode = conf_node::C_DISABLED;
911	}
912	else if (connectmode == conf_node::C_ALWAYS)
913	establish_connection ();	1074	establish_connection ();
914	}	1075	}
		1076
915	break;	1077	break;
916		1078
917	case vpn_packet::PT_AUTH_REQ:	1079	case vpn_packet::PT_AUTH_REQ:
918	if (auth_rate_limiter.can (rsi))	1080	if (auth_rate_limiter.can (rsi))
919	{	1081	{
920	auth_req_packet p = (auth_req_packet ) pkt;	1082	auth_req_packet p = (auth_req_packet )pkt;
921		1083
922	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1084	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1085	conf->nodename, p->initiate ? "initiate" : "reply",
		1086	p->protocols, p->features);
923		1087
924	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1088	if (memcmp (p->magic, MAGIC, 8))
		1089	{
		1090	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1091	conf->nodename, (const char *)rsi);
		1092	}
		1093	else if (p->chk_config (conf, rsi))
925	{	1094	{
926	if (p->prot_minor != PROTOCOL_MINOR)	1095	if (p->prot_minor != PROTOCOL_MINOR)
927	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1096	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
928	conf->nodename, (const char *)rsi,	1097	conf->nodename, (const char *)rsi,
929	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1098	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
930		1099
931	if (p->initiate)	1100	if (p->initiate)
		1101	{
932	send_auth_request (rsi, false);	1102	send_auth_request (rsi, false);
933		1103
934	rsachallenge k;	1104	if (ictx && octx)
		1105	reset_connection ("reconnect");
		1106	}
935		1107
		1108	auth_data auth;
		1109
936	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1110	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
937	{	1111	{
938	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1112	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
939	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1113	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
940	break;
941	}	1114	}
942	else	1115	else
943	{	1116	{
944	delete octx;	1117	bool chg = !have_rcv_auth \|\| !slow_memeq (&rcv_auth, &auth, sizeof auth);
945		1118
946	octx = new crypto_ctx (k, 1);	1119	rcv_auth = auth;
947	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1120	have_rcv_auth = true;
948		1121
		1122	send_auth_response (rsi);
		1123
		1124	if (chg)
		1125	{
949	conf->protocols = p->protocols;	1126	conf->protocols = p->protocols;
950	features = p->features & config_packet::get_features ();	1127	features = p->features & config_packet::get_features ();
951		1128
952	send_auth_response (rsi, p->id, k);
953
954	connection_established ();	1129	connection_established (rsi);
955
956	break;	1130	}
957	}	1131	}
		1132
		1133	break;
958	}	1134	}
959	else
960	slog (L_WARN, _("%s(%s): protocol mismatch"),
961	conf->nodename, (const char *)rsi);
962		1135
963	send_reset (rsi);	1136	send_reset (rsi);
964	}	1137	}
965		1138
966	break;	1139	break;
967		1140
968	case vpn_packet::PT_AUTH_RES:	1141	case vpn_packet::PT_AUTH_RES:
969	{	1142	{
970	auth_res_packet p = (auth_res_packet ) pkt;	1143	auth_res_packet p = (auth_res_packet )pkt;
971		1144
972	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1145	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
973		1146
974	if (p->chk_config ())	1147	auth_mac local_mac;
		1148	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1149
		1150	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
975	{	1151	{
976	if (p->prot_minor != PROTOCOL_MINOR)
977	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
978	conf->nodename, (const char *)rsi,
979	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
980
981	rsachallenge chg;
982
983	if (!rsa_cache.find (p->id, chg))
984	{
985	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1152	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
986	conf->nodename, (const char *)rsi);	1153	conf->nodename, (const char *)rsi);
987	break;
988	}	1154	}
989	else	1155	else if (!have_snd_auth)
990	{	1156	{
991	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1157	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
992		1158
993	if (!p->hmac_chk (cctx))	1159	have_snd_auth = true;
994	{
995	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
996	"could be an attack, or just corruption or a synchronization error"),
997	conf->nodename, (const char *)rsi);
998	break;
999	}
1000	else
1001	{
1002	rsaresponse h;
1003
1004	rsa_hash (p->id, chg, h);
1005
1006	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
1007	{
1008	prot_minor = p->prot_minor;
1009
1010	delete ictx; ictx = cctx;
1011
1012	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1013
1014	si = rsi;
1015	protocol = rsi.prot;
1016
1017	connection_established ();	1160	connection_established (rsi);
1018
1019	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1020	conf->nodename, (const char *)rsi,
1021	p->prot_major, p->prot_minor);
1022
1023	if (::conf.script_node_up)
1024	run_script (run_script_cb (this, &connection::script_node_up), false);
1025
1026	break;
1027	}
1028	else
1029	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1030	conf->nodename, (const char *)rsi);
1031	}
1032
1033	delete cctx;
1034	}
1035	}	1161	}
1036	}	1162	}
1037
1038	send_reset (rsi);
1039	break;	1163	break;
1040		1164
1041	case vpn_packet::PT_DATA_COMPRESSED:	1165	case vpn_packet::PT_DATA_COMPRESSED:
1042	#if !ENABLE_COMPRESSION	1166	#if !ENABLE_COMPRESSION
1043	send_reset (rsi);	1167	send_reset (rsi);
…		…
1049	if (ictx && octx)	1173	if (ictx && octx)
1050	{	1174	{
1051	vpndata_packet p = (vpndata_packet )pkt;	1175	vpndata_packet p = (vpndata_packet )pkt;
1052		1176
1053	if (!p->hmac_chk (ictx))	1177	if (!p->hmac_chk (ictx))
		1178	{
		1179	// rekeying often creates temporary hmac auth floods
		1180	// we assume they don't take longer than a few seconds normally,
		1181	// and suppress messages and resets during that time.
		1182	//TODO: should be done per source address
		1183	if (!hmac_error)
		1184	{
		1185	hmac_error = ev_now () + 3;
		1186	break;
		1187	}
		1188	else if (hmac_error >= ev_now ())
		1189	break; // silently suppress
		1190	else
		1191	{
1054	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1192	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1055	"could be an attack, or just corruption or a synchronization error"),	1193	"could be an attack, or just corruption or a synchronization error."),
1056	conf->nodename, (const char *)rsi);	1194	conf->nodename, (const char *)rsi);
		1195	// reset
		1196	}
		1197	}
1057	else	1198	else
1058	{	1199	{
1059	u32 seqno;	1200	u32 seqno;
1060	tap_packet *d = p->unpack (this, seqno);	1201	tap_packet *d = p->unpack (this, seqno);
		1202	int seqclass = iseqno.seqno_classify (seqno);
1061		1203
1062	if (iseqno.recv_ok (seqno))	1204	hmac_error = 0;
		1205
		1206	if (seqclass == 0) // ok
1063	{	1207	{
1064	vpn->tap->send (d);	1208	vpn->tap->send (d);
1065		1209
1066	if (si != rsi)	1210	if (si != rsi)
1067	{	1211	{
1068	// fast re-sync on connection changes, useful especially for tcp/ip	1212	// fast re-sync on source address changes, useful especially for tcp/ip
		1213	//if (last_si_change < ev_now () + 5.)
1069	si = rsi;	1214	// {
1070
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1215	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1072	conf->nodename, (const char )si, (const char )rsi);	1216	conf->nodename, (const char )si, (const char )rsi);
		1217
		1218	si = rsi;
		1219
		1220	if (::conf.script_node_change)
		1221	{
		1222	run_script_cb *cb = new run_script_cb;
		1223	cb->set<connection, &connection::script_node_change> (this);
		1224	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1225	}
		1226
		1227	// }
		1228	//else
		1229	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1230	// conf->nodename, (const char )si, (const char )rsi);
1073	}	1231	}
		1232	}
		1233	else if (seqclass == 1) // far history
		1234	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1235	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1236	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1237	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1238	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1239	else if (seqclass == 3) // reset
		1240	{
		1241	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1242	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1243	send_reset (rsi);
1074	}	1244	}
1075		1245
1076	delete d;	1246	delete d;
1077	break;	1247	break;
1078	}	1248	}
…		…
1082	break;	1252	break;
1083		1253
1084	case vpn_packet::PT_CONNECT_REQ:	1254	case vpn_packet::PT_CONNECT_REQ:
1085	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1255	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1086	{	1256	{
1087	connect_req_packet p = (connect_req_packet ) pkt;	1257	connect_req_packet p = (connect_req_packet )pkt;
1088		1258
1089	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1259	if (p->id > 0 && p->id <= vpn->conns.size ())
1090	connection *c = vpn->conns[p->id - 1];
1091	conf->protocols = p->protocols;
1092
1093	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1094	conf->id, p->id, c->ictx && c->octx);
1095
1096	if (c->ictx && c->octx)
1097	{	1260	{
		1261	connection *c = vpn->conns[p->id - 1];
		1262	conf->protocols = p->protocols;
		1263
		1264	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1265	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1266	p->protocols,
		1267	c->ictx && c->octx);
		1268
		1269	if (c->ictx && c->octx)
		1270	{
1098	// send connect_info packets to both sides, in case one is	1271	// send connect_info packets to both sides, in case one is
1099	// behind a nat firewall (or both ;)	1272	// behind a nat firewall (or both ;)
1100	c->send_connect_info (conf->id, si, conf->protocols);	1273	c->send_connect_info (conf->id, si, conf->protocols);
1101	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1274	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1275	}
		1276	else
		1277	c->establish_connection ();
1102	}	1278	}
1103	else	1279	else
1104	c->establish_connection ();	1280	slog (L_WARN,
		1281	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1282	p->id);
1105	}	1283	}
1106		1284
1107	break;	1285	break;
1108		1286
1109	case vpn_packet::PT_CONNECT_INFO:	1287	case vpn_packet::PT_CONNECT_INFO:
1110	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1288	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1111	{	1289	{
1112	connect_info_packet p = (connect_info_packet )pkt;	1290	connect_info_packet p = (connect_info_packet )pkt;
1113		1291
1114	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1292	if (p->id > 0 && p->id <= vpn->conns.size ())
1115	{	1293	{
1116	connection *c = vpn->conns[p->id - 1];	1294	connection *c = vpn->conns[p->id - 1];
1117		1295
1118	c->conf->protocols = p->protocols;	1296	c->conf->protocols = p->protocols;
1119	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1297	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1120	p->si.upgrade_protocol (protocol, c->conf);	1298	p->si.upgrade_protocol (protocol, c->conf);
1121		1299
1122	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1300	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1123	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1301	conf->nodename,
		1302	vpn->conns[p->id - 1]->conf->nodename,
		1303	(const char *)p->si,
		1304	p->protocols,
		1305	protocol,
		1306	p->si.supported_protocols (c->conf),
		1307	!c->ictx && !c->octx);
1124		1308
1125	const sockinfo &dsi = forward_si (p->si);	1309	const sockinfo &dsi = forward_si (p->si);
1126		1310
1127	if (dsi.valid ())	1311	if (dsi.valid ())
1128	c->send_auth_request (dsi, true);	1312	c->send_auth_request (dsi, true);
		1313	else
		1314	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1315	vpn->conns[p->id - 1]->conf->nodename,
		1316	(const char *)p->si);
1129	}	1317	}
		1318	else
		1319	slog (L_WARN,
		1320	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1321	p->id);
1130	}	1322	}
1131		1323
1132	break;	1324	break;
1133		1325
1134	default:	1326	default:
1135	send_reset (rsi);	1327	send_reset (rsi);
1136	break;	1328	break;
1137	}	1329	}
1138	}	1330	}
1139		1331
1140	void connection::keepalive_cb (time_watcher &w)	1332	inline void
		1333	connection::keepalive_cb (ev::timer &w, int revents)
1141	{	1334	{
1142	if (NOW >= last_activity + ::conf.keepalive + 30)	1335	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1336
		1337	if (when >= 0)
		1338	w.start (when);
		1339	else if (when < -15)
1143	{	1340	{
1144	reset_connection ();	1341	reset_connection ("keepalive overdue");
1145	establish_connection ();	1342	establish_connection ();
1146	}	1343	}
1147	else if (NOW < last_activity + ::conf.keepalive)
1148	w.start (last_activity + ::conf.keepalive);
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1344	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1345	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1346	{
		1347	w.start (3);
1152	send_ping (si);	1348	send_ping (si);
1153	w.start (NOW + 5);
1154	}	1349	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1350	else if (when >= -10)
1156	// hold ondemand connections implicitly a few seconds longer	1351	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1352	// should delete octx, though, or something like that ;)
1158	w.start (last_activity + ::conf.keepalive + 10);	1353	w.start (when + 10);
1159	else	1354	else
1160	reset_connection ();	1355	reset_connection ("keepalive timeout");
1161	}	1356	}
1162		1357
		1358	void
1163	void connection::send_connect_request (int id)	1359	connection::send_connect_request (int id)
1164	{	1360	{
1165	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1361	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1166		1362
1167	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1363	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1364	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1365	THISNODE->protocols);
1168	p->hmac_set (octx);	1366	p->hmac_set (octx);
1169	send_vpn_packet (p, si);	1367	send_vpn_packet (p, si);
1170		1368
1171	delete p;	1369	delete p;
1172	}	1370	}
1173		1371
1174	void connection::script_node ()	1372	void
		1373	connection::script_init_env (const char *ext)
1175	{	1374	{
1176	vpn->script_if_up ();
1177
1178	char *env;	1375	char *env;
		1376	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1377	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1378	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1379	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1380	conf->id & 0xff); putenv (env);
		1381	}
		1382
		1383	void
		1384	connection::script_init_connect_env ()
		1385	{
		1386	vpn->script_init_env ();
		1387
		1388	char *env;
1179	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1389	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1390	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1180	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1391	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1181	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1392	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1182	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1393	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1183	}	1394	}
1184		1395
		1396	inline const char *
1185	const char *connection::script_node_up ()	1397	connection::script_node_up ()
1186	{	1398	{
1187	script_node ();	1399	script_init_connect_env ();
1188		1400
1189	putenv ("STATE=up");	1401	putenv ((char *)"STATE=up");
1190		1402
		1403	char *filename;
		1404	asprintf (&filename,
		1405	"%s/%s",
		1406	confbase,
1191	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1407	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1192	}
1193		1408
		1409	return filename;
		1410	}
		1411
		1412	inline const char *
		1413	connection::script_node_change ()
		1414	{
		1415	script_init_connect_env ();
		1416
		1417	putenv ((char *)"STATE=change");
		1418
		1419	char *filename;
		1420	asprintf (&filename,
		1421	"%s/%s",
		1422	confbase,
		1423	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1424
		1425	return filename;
		1426	}
		1427
		1428	inline const char *
1194	const char *connection::script_node_down ()	1429	connection::script_node_down ()
1195	{	1430	{
1196	script_node ();	1431	script_init_connect_env ();
1197		1432
1198	putenv ("STATE=down");	1433	putenv ((char *)"STATE=down");
1199		1434
1200	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1435	char *filename;
		1436	asprintf (&filename,
		1437	"%s/%s",
		1438	confbase,
		1439	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1440
		1441	return filename;
1201	}	1442	}
1202		1443
1203	connection::connection (struct vpn vpn, conf_node conf)	1444	connection::connection (struct vpn vpn, conf_node conf)
1204	: vpn(vpn), conf(conf)	1445	: vpn(vpn), conf(conf),
1205	, rekey (this, &connection::rekey_cb)
1206	, keepalive (this, &connection::keepalive_cb)
1207	, establish_connection (this, &connection::establish_connection_cb)
1208	#if ENABLE_DNS	1446	#if ENABLE_DNS
1209	, dns (0)	1447	dns (0),
1210	#endif	1448	#endif
		1449	data_queue(conf->max_ttl, conf->max_queue + 1),
		1450	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1211	{	1451	{
		1452	rekey .set<connection, &connection::rekey_cb > (this);
		1453	keepalive .set<connection, &connection::keepalive_cb > (this);
		1454	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1455
		1456	last_establish_attempt = 0.;
1212	octx = ictx = 0;	1457	octx = ictx = 0;
1213	retry_cnt = 0;
1214		1458
1215	if (!conf->protocols) // make sure some protocol is enabled	1459	connectmode = conf->connectmode;
1216	conf->protocols = PROT_UDPv4;
1217		1460
1218	connectmode = conf_node::C_ALWAYS; // initial setting	1461	// queue a dummy packet to force an initial connection attempt
		1462	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1463	vpn_queue.put (new net_packet);
		1464
1219	reset_connection ();	1465	reset_connection ("startup");
1220	}	1466	}
1221		1467
1222	connection::~connection ()	1468	connection::~connection ()
1223	{	1469	{
1224	shutdown ();	1470	shutdown ();
1225	}	1471	}
1226		1472
		1473	void
1227	void connection_init ()	1474	connection_init ()
1228	{	1475	{
1229	auth_rate_limiter.clear ();	1476	auth_rate_limiter.clear ();
1230	reset_rate_limiter.clear ();	1477	reset_rate_limiter.clear ();
1231	}	1478	}
1232		1479

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Comparing gvpe/src/connection.C (file contents): Revision 1.49 by pcg, Sat Mar 12 18:10:40 2005 UTC vs. Revision 1.113 by root, Thu Jan 29 00:21:39 2015 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.49 by pcg, Sat Mar 12 18:10:40 2005 UTC vs.
Revision 1.113 by root, Thu Jan 29 00:21:39 2015 UTC