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

Comparing gvpe/src/connection.C (file contents):
Revision 1.25 by pcg, Sat Jan 17 01:18:36 2004 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) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013,2016 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	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
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	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
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	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
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	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.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	extern "C" {
23	# include "lzf/lzf.h"
24	}
25
26	#include <cassert>
27
28	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
29		37
		38	#include <openssl/opensslv.h>
30	#include <openssl/rand.h>	39	#include <openssl/rand.h>
31	#include <openssl/evp.h>	40	#include <openssl/evp.h>
32	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
33	#include <openssl/err.h>	42	#include <openssl/err.h>
34		43
35	#include "gettext.h"
36
37	#include "conf.h"	44	#include "conf.h"
38	#include "slog.h"	45	#include "slog.h"
		46	#include "crypto.h"
39	#include "device.h"	47	#include "device.h"
40	#include "vpn.h"	48	#include "vpn.h"
41	#include "connection.h"	49	#include "connection.h"
		50	#include "hkdf.h"
42		51
43	#include "netcompat.h"	52	#include "netcompat.h"
44		53
45	#if !HAVE_RAND_PSEUDO_BYTES
46	# define RAND_pseudo_bytes RAND_bytes
47	#endif
48
49	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	54	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		55
		56	#define LZF_STATE_ARG 1
		57	#define ULTRA_FAST 1
		58	#define HLOG 15
		59	#define INIT_HTAB 0
		60	#include "lzf/lzf_c.c"
		61	#include "lzf/lzf_d.c"
		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	//////////////////////////////////////////////////////////////////////////////
50		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	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	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	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
81	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
82	EVP_DigestUpdate(&ctx, &id, sizeof id);
83	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 (time_watcher &w); time_watcher 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	{
101	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
102	{
103	memcpy (&chg, &i->chg, sizeof chg);
104
105	erase (i);
106	return true;
107	}
108	}
109
110	if (cleaner.at < NOW)
111	cleaner.start (NOW + RSA_TTL);
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 = NOW + RSA_TTL;
124	e.id = id;
125	memcpy (&e.chg, &chg, sizeof chg);
126
127	push_back (e);
128
129	if (cleaner.at < NOW)
130	cleaner.start (NOW + RSA_TTL);
131	}
132
133	rsa_cache ()
134	: cleaner (this, &rsa_cache::cleaner_cb)
135	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
136		199
137	} rsa_cache;	200	// eventual response data
138		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
139	void rsa_cache::cleaner_cb (time_watcher &w)
140	{
141	if (!empty ())
142	{	202	}
143	w.start (NOW + RSA_TTL);
144		203
145	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
146	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
147	i = erase (i);
148	else
149	++i;
150	}
151	}	206	}
152		207
153	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
154		209
155	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)
156	{	212	{
157	if (queue[i])	213	queue = new pkt [max_queue];
158	{
159	delete queue[i];
160	j = (j + 1) % QUEUEDEPTH;
161	}
162		214
163	queue[i] = p;
164
165	i = (i + 1) % QUEUEDEPTH;
166	}
167
168	net_packet *pkt_queue::get ()
169	{
170	net_packet *p = queue[j];
171
172	if (p)
173	{
174	queue[j] = 0;
175	j = (j + 1) % QUEUEDEPTH;
176	}
177
178	return p;
179	}
180
181	pkt_queue::pkt_queue ()
182	{
183	memset (queue, 0, sizeof (queue));
184	i = 0;	215	i = 0;
185	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
186	}	219	}
187		220
188	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
189	{	222	{
190	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
191	delete queue[i];	226	delete [] queue;
192	}	227	}
193		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
194	struct net_rateinfo {	285	struct net_rateinfo
		286	{
195	u32 host;	287	u32 host;
196	double pcnt, diff;	288	double pcnt, diff;
197	tstamp last;	289	tstamp last;
198	};	290	};
199		291
200	// only do action once every x seconds per host whole allowing bursts.	292	// only do action once every x seconds per host whole allowing bursts.
201	// this implementation ("splay list" ;) is inefficient,	293	// this implementation ("splay list" ;) is inefficient,
202	// but low on resources.	294	// but low on resources.
203	struct net_rate_limiter : list<net_rateinfo>	295	struct net_rate_limiter : list<net_rateinfo>
204	{	296	{
205	static const double ALPHA = 1. - 1. / 600.; // allow bursts	297	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
206	static const double CUTOFF = 10.; // one event every CUTOFF seconds	298	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	299	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	300	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
209		301
210	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
211	bool can (u32 host);	303	bool can (u32 host);
212	};	304	};
213		305
214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
215		307
		308	bool
216	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
217	{	310	{
218	iterator i;	311	iterator i;
219		312
220	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
221	if (i->host == host)	314	if (i->host == host)
222	break;	315	break;
223	else if (i->last < NOW - EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
224	i = erase (i);	317	i = erase (i);
225	else	318	else
226	i++;	319	i++;
227		320
228	if (i == end ())	321	if (i == end ())
229	{	322	{
230	net_rateinfo ri;	323	net_rateinfo ri;
231		324
232	ri.host = host;	325	ri.host = host;
233	ri.pcnt = 1.;	326	ri.pcnt = 1.;
234	ri.diff = MAXDIF;	327	ri.diff = NRL_MAXDIF;
235	ri.last = NOW;	328	ri.last = ev_now ();
236		329
237	push_front (ri);	330	push_front (ri);
238		331
239	return true;	332	return true;
240	}	333	}
241	else	334	else
242	{	335	{
243	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
244	erase (i);	337	erase (i);
245		338
246	ri.pcnt = ri.pcnt * ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
248		341
249	ri.last = NOW;	342	ri.last = ev_now ();
250		343
251	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
252		345
253	bool send = dif > CUTOFF;	346	bool send = dif > NRL_CUTOFF;
254		347
255	if (dif > MAXDIF)	348	if (dif > NRL_MAXDIF)
256	{	349	{
257	ri.pcnt = 1.;	350	ri.pcnt = 1.;
258	ri.diff = MAXDIF;	351	ri.diff = NRL_MAXDIF;
259	}	352	}
260	else if (send)	353	else if (send)
261	ri.pcnt++;	354	ri.pcnt++;
262		355
263	push_front (ri);	356	push_front (ri);
266	}	359	}
267	}	360	}
268		361
269	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
270		363
271	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
272
273	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
274	{	366	{
275	unsigned int xlen;	367	ctx->hctx.init ();
276		368	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
277	HMAC_CTX *hctx = &ctx->hctx;	369	ctx->hctx.digest (hmac_digest);
278
279	HMAC_Init_ex (hctx, 0, 0, 0, 0);
280	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
281	len - sizeof (hmac_packet));
282	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
283	}	370	}
284		371
285	void	372	void
286	hmac_packet::hmac_set (crypto_ctx *ctx)	373	hmac_packet::hmac_set (crypto_ctx *ctx)
287	{	374	{
288	hmac_gen (ctx);	375	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
289		376	hmac_gen (ctx, hmac_digest);
290	memcpy (hmac, hmac_digest, HMACLENGTH);	377	memcpy (hmac, hmac_digest, HMACLENGTH);
291	}	378	}
292		379
293	bool	380	bool
294	hmac_packet::hmac_chk (crypto_ctx *ctx)	381	hmac_packet::hmac_chk (crypto_ctx *ctx)
295	{	382	{
296	hmac_gen (ctx);	383	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
297		384	hmac_gen (ctx, hmac_digest);
298	return !memcmp (hmac, hmac_digest, HMACLENGTH);	385	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
299	}	386	}
300		387
		388	void
301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	389	vpn_packet::set_hdr (ptype type_, unsigned int dst)
302	{	390	{
303	type = type_;	391	type = type_;
304		392
305	int src = THISNODE->id;	393	int src = THISNODE->id;
306		394
…		…
308	srcdst = ((src >> 8) << 4) \| (dst >> 8);	396	srcdst = ((src >> 8) << 4) \| (dst >> 8);
309	dst1 = dst;	397	dst1 = dst;
310	}	398	}
311		399
312	#define MAXVPNDATA (MAX_MTU - 6 - 6)	400	#define MAXVPNDATA (MAX_MTU - 6 - 6)
313	#define DATAHDR (sizeof (u32) + RAND_SIZE)
314		401
315	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
316	{	412	{
317	u8 data[MAXVPNDATA + DATAHDR]; // seqno	413	// the distance from beginning of packet to data member
318		414	return data - at (0);
319	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
320	tap_packet unpack (connection conn, u32 &seqno);
321	private:
322
323	const u32 data_hdr_size () const
324	{
325	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
326	}
327	};	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	}
328		439
329	void	440	void
330	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)
331	{	442	{
332	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	443	EVP_CIPHER_CTX *cctx = conn->octx->cctx;
333	int outl = 0, outl2;	444	int outl = 0, outl2;
334	ptype type = PT_DATA_UNCOMPRESSED;	445	ptype type = PT_DATA_UNCOMPRESSED;
335		446
336	#if ENABLE_COMPRESSION	447	#if ENABLE_COMPRESSION
337	u8 cdata[MAX_MTU];	448	u8 cdata[MAX_MTU];
338	u32 cl;
339		449
		450	if (conn->features & FEATURE_COMPRESSION)
		451	{
		452	static LZF_STATE lzf_state;
340	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	453	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7, lzf_state);
		454
341	if (cl)	455	if (cl)
342	{	456	{
343	type = PT_DATA_COMPRESSED;	457	type = PT_DATA_COMPRESSED;
344	d = cdata;	458	d = cdata;
345	l = cl + 2;	459	l = cl + 2;
346		460
347	d[0] = cl >> 8;	461	d[0] = cl >> 8;
348	d[1] = cl;	462	d[1] = cl;
		463	}
349	}	464	}
350	#endif	465	#endif
351		466
		467	ctr = htonl (seqno);
		468
352	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	469	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
353		470
354	struct {
355	#if RAND_SIZE
356	u8 rnd[RAND_SIZE];
357	#endif
358	u32 seqno;
359	} datahdr;
360
361	datahdr.seqno = ntohl (seqno);
362	#if RAND_SIZE
363	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
364	#endif
365
366	EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
367	(unsigned char *) data + outl, &outl2,	472	(unsigned char *)data + outl, &outl2,
368	(unsigned char *) &datahdr, DATAHDR);	473	(unsigned char *)d, l));
369	outl += outl2;	474	outl += outl2;
370		475
371	EVP_EncryptUpdate (cctx,	476	// it seems this is a nop for us, but we do it anyways
372	(unsigned char *) data + outl, &outl2,	477	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
373	(unsigned char *) d, l);
374	outl += outl2;	478	outl += outl2;
375		479
376	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);
377	outl += outl2;
378
379	len = outl + data_hdr_size ();	480	len = data_hdr_size () + outl;
380		481
381	set_hdr (type, dst);	482	set_hdr (type, dst);
382		483
383	hmac_set (conn->octx);	484	hmac_set (conn->octx);
384	}	485	}
385		486
386	tap_packet *	487	tap_packet *
387	vpndata_packet::unpack (connection *conn, u32 &seqno)	488	vpndata_packet::unpack (connection *conn, u32 &seqno)
388	{	489	{
389	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	490	EVP_CIPHER_CTX *cctx = conn->ictx->cctx;
390	int outl = 0, outl2;	491	int outl = 0, outl2;
391	tap_packet *p = new tap_packet;	492	tap_packet *p = new tap_packet;
392	u8 *d;	493	u8 *d;
393	u32 l = len - data_hdr_size ();
394		494
		495	seqno = ntohl (ctr);
		496
395	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	497	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
396		498
397	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
398	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
399		501
400	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
401	d = cdata;	503	d = cdata;
402	else	504	else
403	#endif	505	#endif
404	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6];
405		507
406	/* this overwrites part of the src mac, but we fix that later */	508	// this can overwrite the len/dst/src fields
407	EVP_DecryptUpdate (cctx,	509	require (EVP_DecryptUpdate (cctx,
408	d, &outl2,	510	d, &outl2,
409	(unsigned char *)&data, len - data_hdr_size ());	511	(unsigned char *)&data, len - data_hdr_size ()));
410	outl += outl2;	512	outl += outl2;
411		513
		514	// it seems this is a nop for us, but we do it anyways
412	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
413	outl += outl2;	516	outl += outl2;
414		517
415	seqno = ntohl ((u32 )(d + RAND_SIZE));
416
417	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
418	id2mac (src (), p->src);	519	id2mac (src (), p->src);
419		520
420	#if ENABLE_COMPRESSION	521	#if ENABLE_COMPRESSION
421	if (type == PT_DATA_COMPRESSED)	522	if (type == PT_DATA_COMPRESSED)
422	{	523	{
423	u32 cl = (d[DATAHDR] << 8) \| d[DATAHDR + 1];	524	u32 cl = (d[0] << 8) \| d[1];
424		525
425	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,
426	&(*p)[6 + 6], MAX_MTU)	527	&(*p)[6 + 6], MAX_MTU)
427	+ 6 + 6;	528	+ 6 + 6;
428	}	529	}
429	else	530	else
430	p->len = outl + (6 + 6 - DATAHDR);	531	p->len = outl + (6 + 6);
431	#endif	532	#endif
432		533
433	return p;	534	return p;
434	}	535	}
435		536
…		…
442	}	543	}
443	};	544	};
444		545
445	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
446	{	547	{
447	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
448	// field comes before this data, so peers with other
449	// hmacs simply will not work.
450	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
451	u8 flags, challengelen, pad2, pad3;	550	u8 flags, features, pad6, pad7, pad8;
452	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
453		552
454	const u8 curflags () const	553	void setup (ptype type, int dst);
		554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		555
		556	static u8 get_features ()
455	{	557	{
		558	u8 f = 0;
		559	#if ENABLE_COMPRESSION
		560	f \|= FEATURE_COMPRESSION;
		561	#endif
		562	#if ENABLE_ROHC
		563	f \|= FEATURE_ROHC;
		564	#endif
		565	#if ENABLE_BRIDGING
		566	f \|= FEATURE_BRIDGING;
		567	#endif
456	return 0x80	568	return f;
457	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
458	}	569	}
459
460	void setup (ptype type, int dst);
461	bool chk_config () const;
462	};	570	};
463		571
		572	void
464	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
465	{	574	{
466	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
467	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
468	randsize = RAND_SIZE;	577	flags = 0;
469	hmaclen = HMACLENGTH;	578	features = get_features ();
470	flags = curflags ();
471	challengelen = sizeof (rsachallenge);
472		579
		580	strncpy ((char *)serial, conf.serial, sizeof (serial));
		581
473	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
474	digest_nid = htonl (EVP_MD_type (RSA_HASH));
475	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 ()));
476		585
477	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
478	set_hdr (type, dst);	587	set_hdr (type, dst);
479	}	588	}
480		589
481	bool config_packet::chk_config () const	590	bool
		591	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
482	{	592	{
483	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
484	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)"),
485	else if (randsize != RAND_SIZE)	595	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
487	else if (hmaclen != HMACLENGTH)
488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	596	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
494	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)"),
495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	598	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
496	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
497	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	599	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
498	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 ()));
499	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)
500	return true;	613	return true;
		614	}
501		615
502	return false;	616	return false;
503	}	617	}
504		618
505	struct auth_req_packet : config_packet	619	struct auth_req_packet : config_packet // UNPROTECTED
506	{	620	{
507	char magic[8];	621	char magic[8];
508	u8 initiate; // false if this is just an automatic reply	622	u8 initiate; // false if this is just an automatic reply
509	u8 protocols; // supported protocols (will get patches on forward)	623	u8 protocols; // supported protocols (will be patched on forward)
510	u8 pad2, pad3;	624	u8 pad2, pad3;
511	rsaid id;	625	auth_encr encr;
512	rsaencrdata encr;
513		626
514	auth_req_packet (int dst, bool initiate_, u8 protocols_)	627	auth_req_packet (int dst, bool initiate_, u8 protocols_)
515	{	628	{
516	config_packet::setup (PT_AUTH_REQ, dst);	629	config_packet::setup (PT_AUTH_REQ, dst);
517	strncpy (magic, MAGIC, 8);	630	memcpy (magic, MAGIC, 8);
518	initiate = !!initiate_;	631	initiate = !!initiate_;
519	protocols = protocols_;	632	protocols = protocols_;
520		633
521	len = sizeof (*this) - sizeof (net_packet);	634	len = sizeof (*this) - sizeof (net_packet);
522	}	635	}
523	};	636	};
524		637
525	struct auth_res_packet : config_packet	638	struct auth_res_packet : vpn_packet // UNPROTECTED
526	{	639	{
527	rsaid id;
528	u8 pad1, pad2, pad3;
529	u8 response_len; // encrypted length
530	rsaresponse response;	640	auth_response response;
531		641
532	auth_res_packet (int dst)	642	auth_res_packet (int dst)
533	{	643	{
534	config_packet::setup (PT_AUTH_RES, dst);	644	set_hdr (PT_AUTH_RES, dst);
535		645
536	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
537	}	647	}
538	};	648	};
539		649
…		…
569	};	679	};
570		680
571	/////////////////////////////////////////////////////////////////////////////	681	/////////////////////////////////////////////////////////////////////////////
572		682
573	void	683	void
574	connection::connection_established ()	684	connection::connection_established (const sockinfo &rsi)
575	{	685	{
576	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."));
577	{	702	}
578	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);
579		706
580	rekey.start (NOW + ::conf.rekey);	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
		710	// make sure rekeying timeouts are slightly asymmetric
		711	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		712	rekey.start (rekey_interval, rekey_interval);
		713
		714	hmac_error = 0.;
		715
581	keepalive.start (NOW + ::conf.keepalive);	716	keepalive.start (::conf.keepalive);
582		717
583	// send queued packets	718	// send queued packets
584	if (ictx && octx)
585	{
586	while (tap_packet p = (tap_packet )data_queue.get ())	719	while (tap_packet p = (tap_packet )data_queue.get ())
587	{	720	{
588	send_data_packet (p);	721	if (p->len) send_data_packet (p);
589	delete p;	722	delete p;
590	}	723	}
591		724
592	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	725	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
593	{	726	{
594	send_vpn_packet (p, si, IPTOS_RELIABILITY);	727	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
595	delete p;	728	delete p;
596	}
597	}
598	}	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 ());
599	else	739	else
600	{	740	{
601	retry_cnt = 0;	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
602	establish_connection.start (NOW + 5);	742	protocol = 0;
603	keepalive.stop ();
604	rekey.stop ();
605	}	743	}
606	}
607
608	void
609	connection::reset_si ()
610	{
611	protocol = best_protocol (THISNODE->protocols & conf->protocols);
612
613	// mask out protocols we cannot establish
614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
616		744
617	si.set (conf, protocol);	745	si.set (conf, protocol);
618	}	746	}
619		747
620	// ensure sockinfo is valid, forward if necessary	748	// ensure sockinfo is valid, forward if necessary
621	const sockinfo &	749	const sockinfo &
622	connection::forward_si (const sockinfo &si) const	750	connection::forward_si (const sockinfo &si) const
623	{	751	{
624	if (!si.valid ())	752	if (!si.valid ())
625	{	753	{
626	connection *r = vpn->find_router ();	754	connection *r = vpn->find_router_for (this);
627		755
628	if (r)	756	if (r)
629	{	757	{
630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	758	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
631	conf->nodename, r->conf->nodename);	759	conf->nodename, r->conf->nodename);
632	return r->si;	760	return r->si;
633	}	761	}
634	else	762	else
635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	763	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
636	conf->nodename);	764	conf->nodename);
637	}	765	}
638		766
639	return si;	767	return si;
640	}	768	}
641		769
642	void	770	void
643	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)
644	{	772	{
645	if (!vpn->send_vpn_packet (pkt, si, tos))	773	if (!vpn->send_vpn_packet (pkt, si, tos))
646	reset_connection ();	774	reset_connection ("packet send error");
647	}	775	}
648		776
649	void	777	void
650	connection::send_ping (const sockinfo &si, u8 pong)	778	connection::send_ping (const sockinfo &si, u8 pong)
651	{	779	{
652	ping_packet *pkt = new ping_packet;	780	ping_packet *pkt = new ping_packet;
653		781
654	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);
655	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	785	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
656		786
657	delete pkt;	787	delete pkt;
658	}	788	}
659		789
…		…
674	void	804	void
675	connection::send_auth_request (const sockinfo &si, bool initiate)	805	connection::send_auth_request (const sockinfo &si, bool initiate)
676	{	806	{
677	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);
678		808
679	rsachallenge chg;	809	generate_auth_data ();
680	rsa_cache.gen (pkt->id, chg);
681	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	810	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
682		811
683	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);
684
685	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
686		814
687	delete pkt;	815	delete pkt;
688	}	816	}
689		817
690	void	818	void
691	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	819	connection::send_auth_response (const sockinfo &si)
692	{	820	{
693	auth_res_packet *pkt = new auth_res_packet (conf->id);	821	auth_res_packet *pkt = new auth_res_packet (conf->id);
694		822
695	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);
696		825
697	rsa_hash (id, chg, pkt->response);
698
699	pkt->hmac_set (octx);
700
701	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);
702
703	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
704		828
705	delete pkt;	829	delete pkt;
706	}	830	}
707		831
708	void	832	void
709	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	833	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
710	{	834	{
711	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	835	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
712	conf->id, rid, (const char *)rsi);	836	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		837	conf->protocols);
713		838
714	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);
715		840
716	r->hmac_set (octx);	841	r->hmac_set (octx);
717	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
718		843
719	delete r;	844	delete r;
720	}	845	}
721		846
722	void	847	inline void
723	connection::establish_connection_cb (time_watcher &w)	848	connection::establish_connection_cb (ev::timer &w, int revents)
724	{	849	{
725	if (!ictx	850	if (!(ictx && octx)
726	&& conf != THISNODE	851	&& conf != THISNODE
727	&& connectmode != conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
728	&& connectmode != conf_node::C_DISABLED	853	&& connectmode != conf_node::C_DISABLED
729	&& w.at <= NOW)	854	&& !w.is_active ())
730	{	855	{
731	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
732		857	// and stop trying. should probably be handled by a per-connection expire handler.
733	if (retry_int < 3600 * 8)	858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ("no demand");
734	retry_cnt++;	861	return;
		862	}
735		863
736	w.start (NOW + retry_int);	864	last_establish_attempt = ev_now ();
		865
		866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		867	? (retry_cnt & 3) + 1
		868	: 1 << (retry_cnt >> 2));
737		869
738	reset_si ();	870	reset_si ();
739		871
740	if (si.prot && !si.host)	872	bool slow = (si.prot & PROT_SLOW) \|\| (conf->low_power \|\| THISNODE->low_power);
		873
		874	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		875	{
		876	/TODO/ /* start the timer so we don't recurse endlessly */
		877	w.start (1);
741	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
		879	}
742	else	880	else
743	{	881	{
		882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
		885
744	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
		887
		888	slow = slow \|\| (dsi.prot & PROT_SLOW);
745		889
746	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
747	{	891	{
748	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))
749	send_auth_request (dsi, true);	896	send_auth_request (dsi, true);
750	else	897	else
751	send_ping (dsi, 0);	898	send_ping (dsi, 0);
752	}	899	}
753	}	900	}
754	}
755	}
756		901
		902	retry_int *= slow ? 4. : 0.9;
		903
		904	if (retry_int < conf->max_retry)
		905	retry_cnt++;
		906	else
		907	retry_int = conf->max_retry;
		908
		909	w.start (retry_int);
		910	}
		911	}
		912
757	void	913	void
758	connection::reset_connection ()	914	connection::reset_connection (const char *reason)
759	{	915	{
760	if (ictx && octx)	916	if (ictx && octx)
761	{	917	{
762	slog (L_INFO, _("%s(%s): connection lost"),	918	slog (L_INFO, _("%s(%s): connection lost (%s)"),
763	conf->nodename, (const char *)si);	919	conf->nodename, (const char *)si, reason);
764		920
765	if (::conf.script_node_down)	921	if (::conf.script_node_down)
766	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);
		925	run_script_queued (cb, _("node-down command execution failed, continuing."));
		926	}
767	}	927	}
768		928
769	delete ictx; ictx = 0;	929	delete ictx; ictx = 0;
770	delete octx; octx = 0;	930	delete octx; octx = 0;
771		931
772	si.host= 0;	932	si.host = 0;
773		933
		934	have_snd_auth = false;
		935	have_rcv_auth = false;
		936	auth_expire = 0.;
		937
774	last_activity = 0;	938	last_activity = 0.;
		939	//last_si_change = 0.;
775	retry_cnt = 0;	940	retry_cnt = 0;
776		941
777	rekey.stop ();	942	rekey.stop ();
778	keepalive.stop ();	943	keepalive.stop ();
779	establish_connection.stop ();	944	establish_connection.stop ();
…		…
783	connection::shutdown ()	948	connection::shutdown ()
784	{	949	{
785	if (ictx && octx)	950	if (ictx && octx)
786	send_reset (si);	951	send_reset (si);
787		952
788	reset_connection ();	953	reset_connection ("shutdown");
789	}	954	}
790		955
791	void	956	// poor-man's rekeying
792	connection::rekey_cb (time_watcher &w)	957	inline void
		958	connection::rekey_cb (ev::timer &w, int revents)
793	{	959	{
794	reset_connection ();	960	reset_connection ("rekeying");
795	establish_connection ();	961	establish_connection ();
796	}	962	}
797		963
798	void	964	void
799	connection::send_data_packet (tap_packet *pkt)	965	connection::send_data_packet (tap_packet *pkt)
…		…
813	if (oseqno > MAX_SEQNO)	979	if (oseqno > MAX_SEQNO)
814	rekey ();	980	rekey ();
815	}	981	}
816		982
817	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
818	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	994	connection::inject_data_packet (tap_packet *pkt)
819	{	995	{
820	if (ictx && octx)	996	if (ictx && octx)
821	send_data_packet (pkt);	997	send_data_packet (pkt);
822	else	998	else
823	{	999	{
824	if (!broadcast)//DDDD
825	data_queue.put (new tap_packet (*pkt));	1000	data_queue.put (new tap_packet (*pkt));
826		1001	post_inject_queue ();
827	establish_connection ();
828	}	1002	}
829	}	1003	}
830		1004
		1005	void
831	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1006	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
832	{	1007	{
833	if (ictx && octx)	1008	if (ictx && octx)
834	send_vpn_packet (pkt, si, tos);	1009	send_vpn_packet (pkt, si, tos);
835	else	1010	else
836	{	1011	{
837	vpn_queue.put (new vpn_packet (*pkt));	1012	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
838		1013	post_inject_queue ();
839	establish_connection ();
840	}	1014	}
841	}	1015	}
842		1016
843	void	1017	void
844	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1018	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
845	{	1019	{
846	last_activity = NOW;	1020	last_activity = ev_now ();
847		1021
848	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.",
849	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;
850		1027
851	switch (pkt->typ ())	1028	switch (pkt->typ ())
852	{	1029	{
853	case vpn_packet::PT_PING:	1030	case vpn_packet::PT_PING:
		1031	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1032
854	// we send pings instead of auth packets after some retries,	1033	// we send pings instead of auth packets after some retries,
855	// so reset the retry counter and establish a connection	1034	// so reset the retry counter and establish a connection
856	// when we receive a ping.	1035	// when we receive a ping.
857	if (!ictx)	1036	if (!ictx)
858	{	1037	{
859	if (auth_rate_limiter.can (rsi))	1038	if (auth_rate_limiter.can (rsi))
860	send_auth_request (rsi, true);	1039	send_auth_request (rsi, true);
861	}	1040	}
862	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.
863	send_ping (rsi, 1); // pong	1044	send_ping (rsi, 1); // pong
864		1045
865	break;	1046	break;
866		1047
867	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 ();
868	break;	1054	break;
869		1055
870	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)
871	{	1060	{
872	reset_connection ();	1061	reset_connection ("remote reset");
873		1062
874	config_packet p = (config_packet ) pkt;	1063	config_packet p = (config_packet ) pkt;
875		1064
876	if (!p->chk_config ())	1065	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
877	{
878	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
879	conf->nodename, (const char *)rsi);
880	connectmode = conf_node::C_DISABLED;
881	}
882	else if (connectmode == conf_node::C_ALWAYS)
883	establish_connection ();	1066	establish_connection ();
884	}	1067	}
		1068
885	break;	1069	break;
886		1070
887	case vpn_packet::PT_AUTH_REQ:	1071	case vpn_packet::PT_AUTH_REQ:
888	if (auth_rate_limiter.can (rsi))	1072	if (auth_rate_limiter.can (rsi))
889	{	1073	{
890	auth_req_packet p = (auth_req_packet ) pkt;	1074	auth_req_packet p = (auth_req_packet )pkt;
891		1075
892	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);
893		1079
894	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))
895	{	1086	{
896	if (p->prot_minor != PROTOCOL_MINOR)	1087	if (p->prot_minor != PROTOCOL_MINOR)
897	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."),
898	conf->nodename, (const char *)rsi,	1089	conf->nodename, (const char *)rsi,
899	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1090	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
900		1091
901	if (p->initiate)	1092	if (p->initiate)
		1093	{
902	send_auth_request (rsi, false);	1094	send_auth_request (rsi, false);
903		1095
904	rsachallenge k;	1096	if (ictx && octx)
		1097	reset_connection ("reconnect");
		1098	}
905		1099
		1100	auth_data auth;
		1101
906	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1102	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
907	{	1103	{
908	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?"),
909	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));
910	break;
911	}	1106	}
912	else	1107	else
913	{	1108	{
914	delete octx;	1109	bool chg = !have_rcv_auth \|\| !slow_memeq (&rcv_auth, &auth, sizeof auth);
915		1110
916	octx = new crypto_ctx (k, 1);	1111	rcv_auth = auth;
917	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1112	have_rcv_auth = true;
918		1113
		1114	send_auth_response (rsi);
		1115
		1116	if (chg)
		1117	{
919	conf->protocols = p->protocols;	1118	conf->protocols = p->protocols;
		1119	features = p->features & config_packet::get_features ();
920		1120
921	send_auth_response (rsi, p->id, k);
922
923	connection_established ();	1121	connection_established (rsi);
924
925	break;	1122	}
926	}	1123	}
		1124
		1125	break;
927	}	1126	}
928	else
929	slog (L_WARN, _("%s(%s): protocol mismatch"),
930	conf->nodename, (const char *)rsi);
931		1127
932	send_reset (rsi);	1128	send_reset (rsi);
933	}	1129	}
934		1130
935	break;	1131	break;
936		1132
937	case vpn_packet::PT_AUTH_RES:	1133	case vpn_packet::PT_AUTH_RES:
938	{	1134	{
939	auth_res_packet p = (auth_res_packet ) pkt;	1135	auth_res_packet p = (auth_res_packet )pkt;
940		1136
941	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1137	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
942		1138
943	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))
944	{	1143	{
945	if (p->prot_minor != PROTOCOL_MINOR)
946	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
947	conf->nodename, (const char *)rsi,
948	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
949
950	rsachallenge chg;
951
952	if (!rsa_cache.find (p->id, chg))
953	{
954	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1144	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
955	conf->nodename, (const char *)rsi);	1145	conf->nodename, (const char *)rsi);
956	break;
957	}	1146	}
958	else	1147	else if (!have_snd_auth)
959	{	1148	{
960	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1149	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
961		1150
962	if (!p->hmac_chk (cctx))	1151	have_snd_auth = true;
963	{
964	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
965	"could be an attack, or just corruption or an synchronization error"),
966	conf->nodename, (const char *)rsi);
967	break;
968	}
969	else
970	{
971	rsaresponse h;
972
973	rsa_hash (p->id, chg, h);
974
975	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
976	{
977	prot_minor = p->prot_minor;
978
979	delete ictx; ictx = cctx;
980
981	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
982
983	si = rsi;
984	protocol = rsi.prot;
985
986	connection_established ();	1152	connection_established (rsi);
987
988	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
989	conf->nodename, (const char *)rsi,
990	p->prot_major, p->prot_minor);
991
992	if (::conf.script_node_up)
993	run_script (run_script_cb (this, &connection::script_node_up), false);
994
995	break;
996	}
997	else
998	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
999	conf->nodename, (const char *)rsi);
1000	}
1001
1002	delete cctx;
1003	}
1004	}	1153	}
1005	}	1154	}
1006
1007	send_reset (rsi);
1008	break;	1155	break;
1009		1156
1010	case vpn_packet::PT_DATA_COMPRESSED:	1157	case vpn_packet::PT_DATA_COMPRESSED:
1011	#if !ENABLE_COMPRESSION	1158	#if !ENABLE_COMPRESSION
1012	send_reset (rsi);	1159	send_reset (rsi);
…		…
1018	if (ictx && octx)	1165	if (ictx && octx)
1019	{	1166	{
1020	vpndata_packet p = (vpndata_packet )pkt;	1167	vpndata_packet p = (vpndata_packet )pkt;
1021		1168
1022	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	{
1023	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"
1024	"could be an attack, or just corruption or an synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1025	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
		1187	// reset
		1188	}
		1189	}
1026	else	1190	else
1027	{	1191	{
1028	u32 seqno;	1192	u32 seqno;
1029	tap_packet *d = p->unpack (this, seqno);	1193	tap_packet *d = p->unpack (this, seqno);
		1194	int seqclass = iseqno.seqno_classify (seqno);
1030		1195
1031	if (iseqno.recv_ok (seqno))	1196	hmac_error = 0;
		1197
		1198	if (seqclass == 0) // ok
1032	{	1199	{
1033	vpn->tap->send (d);	1200	vpn->tap->send (d);
1034		1201
1035	if (si != rsi)	1202	if (si != rsi)
1036	{	1203	{
1037	// fast re-sync on connection 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.)
1038	si = rsi;	1206	// {
1039
1040	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1207	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1041	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);
1042	}	1223	}
1043
1044	delete d;
1045
1046	break;
1047	}	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);
		1236	}
		1237
		1238	delete d;
		1239	break;
1048	}	1240	}
1049	}	1241	}
1050		1242
1051	send_reset (rsi);	1243	send_reset (rsi);
1052	break;	1244	break;
1053		1245
1054	case vpn_packet::PT_CONNECT_REQ:	1246	case vpn_packet::PT_CONNECT_REQ:
1055	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1247	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1056	{	1248	{
1057	connect_req_packet p = (connect_req_packet ) pkt;	1249	connect_req_packet p = (connect_req_packet )pkt;
1058		1250
1059	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1251	if (p->id > 0 && p->id <= vpn->conns.size ())
1060	connection *c = vpn->conns[p->id - 1];
1061	conf->protocols = p->protocols;
1062
1063	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1064	conf->id, p->id, c->ictx && c->octx);
1065
1066	if (c->ictx && c->octx)
1067	{	1252	{
		1253	connection *c = vpn->conns[p->id - 1];
		1254	conf->protocols = p->protocols;
		1255
		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,
		1259	c->ictx && c->octx);
		1260
		1261	if (c->ictx && c->octx)
		1262	{
1068	// send connect_info packets to both sides, in case one is	1263	// send connect_info packets to both sides, in case one is
1069	// behind a nat firewall (or both ;)	1264	// behind a nat firewall (or both ;)
1070	c->send_connect_info (conf->id, si, conf->protocols);	1265	c->send_connect_info (conf->id, si, conf->protocols);
1071	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1266	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1267	}
		1268	else
		1269	c->establish_connection ();
1072	}	1270	}
1073	else	1271	else
1074	c->establish_connection ();	1272	slog (L_WARN,
		1273	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1274	p->id);
1075	}	1275	}
1076		1276
1077	break;	1277	break;
1078		1278
1079	case vpn_packet::PT_CONNECT_INFO:	1279	case vpn_packet::PT_CONNECT_INFO:
1080	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1280	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1081	{	1281	{
1082	connect_info_packet p = (connect_info_packet ) pkt;	1282	connect_info_packet p = (connect_info_packet )pkt;
1083		1283
1084	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1284	if (p->id > 0 && p->id <= vpn->conns.size ())
1085		1285	{
1086	connection *c = vpn->conns[p->id - 1];	1286	connection *c = vpn->conns[p->id - 1];
1087		1287
1088	c->conf->protocols = p->protocols;	1288	c->conf->protocols = p->protocols;
1089	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));
1090	p->si.upgrade_protocol (protocol, c->conf);	1290	p->si.upgrade_protocol (protocol, c->conf);
1091		1291
1092	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]",
1093	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);
1094		1300
1095	const sockinfo &dsi = forward_si (p->si);	1301	const sockinfo &dsi = forward_si (p->si);
1096		1302
1097	if (dsi.valid ())	1303	if (dsi.valid ())
1098	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);
		1309	}
		1310	else
		1311	slog (L_WARN,
		1312	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1313	p->id);
1099	}	1314	}
1100		1315
1101	break;	1316	break;
1102		1317
1103	default:	1318	default:
1104	send_reset (rsi);	1319	send_reset (rsi);
1105	break;	1320	break;
1106	}	1321	}
1107	}	1322	}
1108		1323
1109	void connection::keepalive_cb (time_watcher &w)	1324	inline void
		1325	connection::keepalive_cb (ev::timer &w, int revents)
1110	{	1326	{
1111	if (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)
1112	{	1332	{
1113	reset_connection ();	1333	reset_connection ("keepalive overdue");
1114	establish_connection ();	1334	establish_connection ();
1115	}	1335	}
1116	else if (NOW < last_activity + ::conf.keepalive)
1117	w.start (last_activity + ::conf.keepalive);
1118	else if (conf->connectmode != conf_node::C_ONDEMAND	1336	else if (conf->connectmode != conf_node::C_ONDEMAND
1119	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1337	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1120	{	1338	{
		1339	w.start (3);
1121	send_ping (si);	1340	send_ping (si);
1122	w.start (NOW + 5);
1123	}	1341	}
1124	else if (NOW < last_activity + ::conf.keepalive + 10)	1342	else if (when >= -10)
1125	// hold ondemand connections implicitly a few seconds longer	1343	// hold ondemand connections implicitly a few seconds longer
1126	// should delete octx, though, or something like that ;)	1344	// should delete octx, though, or something like that ;)
1127	w.start (last_activity + ::conf.keepalive + 10);	1345	w.start (when + 10);
1128	else	1346	else
1129	reset_connection ();	1347	reset_connection ("keepalive timeout");
1130	}	1348	}
1131		1349
		1350	void
1132	void connection::send_connect_request (int id)	1351	connection::send_connect_request (int id)
1133	{	1352	{
1134	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);
1135		1354
1136	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);
1137	p->hmac_set (octx);	1358	p->hmac_set (octx);
1138	send_vpn_packet (p, si);	1359	send_vpn_packet (p, si);
1139		1360
1140	delete p;	1361	delete p;
1141	}	1362	}
1142		1363
1143	void connection::script_node ()	1364	void
		1365	connection::script_init_env (const char *ext)
1144	{	1366	{
1145	vpn->script_if_up ();
1146
1147	char *env;	1367	char *env;
		1368	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1369	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1370	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1371	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1372	conf->id & 0xff); putenv (env);
		1373	}
		1374
		1375	void
		1376	connection::script_init_connect_env ()
		1377	{
		1378	vpn->script_init_env ();
		1379
		1380	char *env;
1148	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);
1149	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1383	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1150	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1384	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1151	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1385	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1152	}	1386	}
1153		1387
		1388	inline const char *
1154	const char *connection::script_node_up ()	1389	connection::script_node_up ()
1155	{	1390	{
1156	script_node ();	1391	script_init_connect_env ();
1157		1392
1158	putenv ("STATE=up");	1393	putenv ((char *)"STATE=up");
1159		1394
		1395	char *filename;
		1396	asprintf (&filename,
		1397	"%s/%s",
		1398	confbase,
1160	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1399	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1161	}
1162		1400
		1401	return filename;
		1402	}
		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 *
1163	const char *connection::script_node_down ()	1421	connection::script_node_down ()
1164	{	1422	{
1165	script_node ();	1423	script_init_connect_env ();
1166		1424
1167	putenv ("STATE=down");	1425	putenv ((char *)"STATE=down");
1168		1426
1169	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1427	char *filename;
1170	}	1428	asprintf (&filename,
		1429	"%s/%s",
		1430	confbase,
		1431	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1171		1432
		1433	return filename;
		1434	}
		1435
1172	connection::connection(struct vpn *vpn_)	1436	connection::connection (struct vpn vpn, conf_node conf)
1173	: vpn(vpn_)	1437	: vpn(vpn), conf(conf),
1174	, rekey (this, &connection::rekey_cb)	1438	#if ENABLE_DNS
1175	, keepalive (this, &connection::keepalive_cb)	1439	dns (0),
		1440	#endif
		1441	data_queue(conf->max_ttl, conf->max_queue + 1),
		1442	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1443	{
		1444	rekey .set<connection, &connection::rekey_cb > (this);
		1445	keepalive .set<connection, &connection::keepalive_cb > (this);
1176	, establish_connection (this, &connection::establish_connection_cb)	1446	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1177	{	1447
		1448	last_establish_attempt = 0.;
1178	octx = ictx = 0;	1449	octx = ictx = 0;
1179	retry_cnt = 0;
1180		1450
1181	connectmode = conf_node::C_ALWAYS; // initial setting	1451	connectmode = conf->connectmode;
		1452
		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
1182	reset_connection ();	1457	reset_connection ("startup");
1183	}	1458	}
1184		1459
1185	connection::~connection ()	1460	connection::~connection ()
1186	{	1461	{
1187	shutdown ();	1462	shutdown ();
1188	}	1463	}
1189		1464
		1465	void
1190	void connection_init ()	1466	connection_init ()
1191	{	1467	{
1192	auth_rate_limiter.clear ();	1468	auth_rate_limiter.clear ();
1193	reset_rate_limiter.clear ();	1469	reset_rate_limiter.clear ();
1194	}	1470	}
1195		1471

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Comparing gvpe/src/connection.C (file contents): Revision 1.25 by pcg, Sat Jan 17 01:18:36 2004 UTC vs. Revision 1.116 by root, Mon Apr 1 03:10:26 2019 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.25 by pcg, Sat Jan 17 01:18:36 2004 UTC vs.
Revision 1.116 by root, Mon Apr 1 03:10:26 2019 UTC