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

Comparing gvpe/src/connection.C (file contents):
Revision 1.22 by pcg, Thu Oct 16 02:41:21 2003 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 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 <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"
34
35	#include "conf.h"	44	#include "conf.h"
36	#include "slog.h"	45	#include "slog.h"
		46	#include "crypto.h"
37	#include "device.h"	47	#include "device.h"
38	#include "vpn.h"	48	#include "vpn.h"
39	#include "connection.h"	49	#include "connection.h"
		50	#include "hkdf.h"
40		51
41	#include "netcompat.h"	52	#include "netcompat.h"
42		53
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	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	//////////////////////////////////////////////////////////////////////////////
48		106
49	struct crypto_ctx	107	struct crypto_ctx
50	{	108	{
51	EVP_CIPHER_CTX cctx;	109	cipher cctx;
52	HMAC_CTX hctx;	110	hmac hctx;
53		111
54	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);
55	~crypto_ctx ();	113	~crypto_ctx ();
56	};	114	};
57		115
58	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)
59	{	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
60	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (cctx);
61	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	146	require (EVP_CipherInit_ex (cctx, CIPHER (), 0, cipher_key, 0, enc));
62	HMAC_CTX_init (&hctx);	147	}
63	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
64	}	148	}
65		149
66	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
67	{	151	{
68	EVP_CIPHER_CTX_cleanup (&cctx);	152	require (EVP_CIPHER_CTX_cleanup (cctx));
69	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;
70	}	180	}
71		181
72	static void	182	static void
73	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
74	{	184	{
75	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
76		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
77	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
78	EVP_DigestInit (&ctx, RSA_HASH);	188	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
79	EVP_DigestUpdate(&ctx, &chg, sizeof chg);
80	EVP_DigestUpdate(&ctx, &id, sizeof id);
81	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
82	EVP_MD_CTX_cleanup (&ctx);
83	}	189	}
84		190
85	struct rsa_entry {	191	void
86	tstamp expire;	192	connection::generate_auth_data ()
87	rsaid id;
88	rsachallenge chg;
89	};
90
91	struct rsa_cache : list<rsa_entry>
92	{	193	{
93	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
94
95	bool find (const rsaid &id, rsachallenge &chg)
96	{
97	for (iterator i = begin (); i != end (); ++i)
98	{
99	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
100	{
101	memcpy (&chg, &i->chg, sizeof chg);
102
103	erase (i);
104	return true;
105	}
106	}
107
108	if (cleaner.at < NOW)
109	cleaner.start (NOW + RSA_TTL);
110
111	return false;
112	}
113
114	void gen (rsaid &id, rsachallenge &chg)
115	{
116	rsa_entry e;
117
118	RAND_bytes ((unsigned char *)&id, sizeof id);
119	RAND_bytes ((unsigned char *)&chg, sizeof chg);
120
121	e.expire = NOW + RSA_TTL;
122	e.id = id;
123	memcpy (&e.chg, &chg, sizeof chg);
124
125	push_back (e);
126
127	if (cleaner.at < NOW)
128	cleaner.start (NOW + RSA_TTL);
129	}
130
131	rsa_cache ()
132	: cleaner (this, &rsa_cache::cleaner_cb)
133	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
134		199
135	} rsa_cache;	200	// eventual response data
136		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
137	void rsa_cache::cleaner_cb (time_watcher &w)
138	{
139	if (empty ())
140	w.at = TSTAMP_CANCEL;
141	else
142	{	202	}
143	w.at = 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 (%d <=> %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 (%d <=> %d)"), randsize, RAND_SIZE);
487	else if (hmaclen != HMACLENGTH)
488	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
489	else if (flags != curflags ())
490	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
491	else if (challengelen != sizeof (rsachallenge))
492	slog (L_WARN, _("challenge length mismatch (%d <=> %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 (%x <=> %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 (%x <=> %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 (%x <=> %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.reset ();
604	rekey.reset ();
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 ();
		810	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
680		811
681	rsa_cache.gen (pkt->id, chg);
682
683	if (0 > RSA_public_encrypt (sizeof chg,
684	(unsigned char )&chg, (unsigned char )&pkt->encr,
685	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
686	fatal ("RSA_public_encrypt error");
687
688	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);
689
690	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
691		814
692	delete pkt;	815	delete pkt;
693	}	816	}
694		817
695	void	818	void
696	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	819	connection::send_auth_response (const sockinfo &si)
697	{	820	{
698	auth_res_packet *pkt = new auth_res_packet (conf->id);	821	auth_res_packet *pkt = new auth_res_packet (conf->id);
699		822
700	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);
701		825
702	rsa_hash (id, chg, pkt->response);
703
704	pkt->hmac_set (octx);
705
706	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);
707
708	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
709		828
710	delete pkt;	829	delete pkt;
711	}	830	}
712		831
713	void	832	void
714	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	833	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
715	{	834	{
716	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	835	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
717	conf->id, rid, (const char *)rsi);	836	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		837	conf->protocols);
718		838
719	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);
720		840
721	r->hmac_set (octx);	841	r->hmac_set (octx);
722	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
723		843
724	delete r;	844	delete r;
725	}	845	}
726		846
727	void	847	inline void
728	connection::establish_connection_cb (time_watcher &w)	848	connection::establish_connection_cb (ev::timer &w, int revents)
729	{	849	{
730	if (ictx \|\| conf == THISNODE	850	if (!(ictx && octx)
		851	&& conf != THISNODE
731	\|\| connectmode == conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
732	\|\| connectmode == conf_node::C_DISABLED)	853	&& connectmode != conf_node::C_DISABLED
733	w.at = TSTAMP_CANCEL;	854	&& !w.is_active ())
734	else if (w.at <= NOW)
735	{	855	{
736	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
737		857	// and stop trying. should probably be handled by a per-connection expire handler.
738	if (retry_int < 3600 * 8)	858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ("no demand");
739	retry_cnt++;	861	return;
		862	}
740		863
741	w.at = 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));
742		869
743	reset_si ();	870	reset_si ();
744		871
745	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);
746	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
		879	}
747	else	880	else
748	{	881	{
		882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
		885
749	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
		887
		888	slow = slow \|\| (dsi.prot & PROT_SLOW);
750		889
751	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
752	{	891	{
753	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))
754	send_auth_request (dsi, true);	896	send_auth_request (dsi, true);
755	else	897	else
756	send_ping (dsi, 0);	898	send_ping (dsi, 0);
757	}	899	}
758	}	900	}
759	}
760	}
761		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
762	void	913	void
763	connection::reset_connection ()	914	connection::reset_connection (const char *reason)
764	{	915	{
765	if (ictx && octx)	916	if (ictx && octx)
766	{	917	{
767	slog (L_INFO, _("%s(%s): connection lost"),	918	slog (L_INFO, _("%s(%s): connection lost (%s)"),
768	conf->nodename, (const char *)si);	919	conf->nodename, (const char *)si, reason);
769		920
770	if (::conf.script_node_down)	921	if (::conf.script_node_down)
771	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	}
772	}	927	}
773		928
774	delete ictx; ictx = 0;	929	delete ictx; ictx = 0;
775	delete octx; octx = 0;	930	delete octx; octx = 0;
776		931
777	si.host= 0;	932	si.host = 0;
778		933
		934	have_snd_auth = false;
		935	have_rcv_auth = false;
		936	auth_expire = 0.;
		937
779	last_activity = 0;	938	last_activity = 0.;
		939	//last_si_change = 0.;
780	retry_cnt = 0;	940	retry_cnt = 0;
781		941
782	rekey.reset ();	942	rekey.stop ();
783	keepalive.reset ();	943	keepalive.stop ();
784	establish_connection.reset ();	944	establish_connection.stop ();
785	}	945	}
786		946
787	void	947	void
788	connection::shutdown ()	948	connection::shutdown ()
789	{	949	{
790	if (ictx && octx)	950	if (ictx && octx)
791	send_reset (si);	951	send_reset (si);
792		952
793	reset_connection ();	953	reset_connection ("shutdown");
794	}	954	}
795		955
796	void	956	// poor-man's rekeying
797	connection::rekey_cb (time_watcher &w)	957	inline void
		958	connection::rekey_cb (ev::timer &w, int revents)
798	{	959	{
799	w.at = TSTAMP_CANCEL;
800
801	reset_connection ();	960	reset_connection ("rekeying");
802	establish_connection ();	961	establish_connection ();
803	}	962	}
804		963
805	void	964	void
806	connection::send_data_packet (tap_packet *pkt)	965	connection::send_data_packet (tap_packet *pkt)
…		…
820	if (oseqno > MAX_SEQNO)	979	if (oseqno > MAX_SEQNO)
821	rekey ();	980	rekey ();
822	}	981	}
823		982
824	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
825	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	994	connection::inject_data_packet (tap_packet *pkt)
826	{	995	{
827	if (ictx && octx)	996	if (ictx && octx)
828	send_data_packet (pkt);	997	send_data_packet (pkt);
829	else	998	else
830	{	999	{
831	if (!broadcast)//DDDD
832	data_queue.put (new tap_packet (*pkt));	1000	data_queue.put (new tap_packet (*pkt));
833		1001	post_inject_queue ();
834	establish_connection ();
835	}	1002	}
836	}	1003	}
837		1004
		1005	void
838	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1006	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
839	{	1007	{
840	if (ictx && octx)	1008	if (ictx && octx)
841	send_vpn_packet (pkt, si, tos);	1009	send_vpn_packet (pkt, si, tos);
842	else	1010	else
843	{	1011	{
844	vpn_queue.put (new vpn_packet (*pkt));	1012	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
845		1013	post_inject_queue ();
846	establish_connection ();
847	}	1014	}
848	}	1015	}
849		1016
850	void	1017	void
851	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1018	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
852	{	1019	{
853	last_activity = NOW;	1020	last_activity = ev_now ();
854		1021
855	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.",
856	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;
857		1027
858	switch (pkt->typ ())	1028	switch (pkt->typ ())
859	{	1029	{
860	case vpn_packet::PT_PING:	1030	case vpn_packet::PT_PING:
		1031	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1032
861	// we send pings instead of auth packets after some retries,	1033	// we send pings instead of auth packets after some retries,
862	// so reset the retry counter and establish a connection	1034	// so reset the retry counter and establish a connection
863	// when we receive a ping.	1035	// when we receive a ping.
864	if (!ictx)	1036	if (!ictx)
865	{	1037	{
866	if (auth_rate_limiter.can (rsi))	1038	if (auth_rate_limiter.can (rsi))
867	send_auth_request (rsi, true);	1039	send_auth_request (rsi, true);
868	}	1040	}
869	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.
870	send_ping (rsi, 1); // pong	1044	send_ping (rsi, 1); // pong
871		1045
872	break;	1046	break;
873		1047
874	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 ();
875	break;	1054	break;
876		1055
877	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)
878	{	1060	{
879	reset_connection ();	1061	reset_connection ("remote reset");
880		1062
881	config_packet p = (config_packet ) pkt;	1063	config_packet p = (config_packet ) pkt;
882		1064
883	if (!p->chk_config ())	1065	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
884	{
885	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
886	conf->nodename, (const char *)rsi);
887	connectmode = conf_node::C_DISABLED;
888	}
889	else if (connectmode == conf_node::C_ALWAYS)
890	establish_connection ();	1066	establish_connection ();
891	}	1067	}
		1068
892	break;	1069	break;
893		1070
894	case vpn_packet::PT_AUTH_REQ:	1071	case vpn_packet::PT_AUTH_REQ:
895	if (auth_rate_limiter.can (rsi))	1072	if (auth_rate_limiter.can (rsi))
896	{	1073	{
897	auth_req_packet p = (auth_req_packet ) pkt;	1074	auth_req_packet p = (auth_req_packet )pkt;
898		1075
899	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);
900		1079
901	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))
902	{	1086	{
903	if (p->prot_minor != PROTOCOL_MINOR)	1087	if (p->prot_minor != PROTOCOL_MINOR)
904	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."),
905	conf->nodename, (const char *)rsi,	1089	conf->nodename, (const char *)rsi,
906	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1090	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
907		1091
908	if (p->initiate)	1092	if (p->initiate)
		1093	{
909	send_auth_request (rsi, false);	1094	send_auth_request (rsi, false);
910		1095
911	rsachallenge k;	1096	if (ictx && octx)
		1097	reset_connection ("reconnect");
		1098	}
912		1099
913	if (0 > RSA_private_decrypt (sizeof (p->encr),	1100	auth_data auth;
914	(unsigned char )&p->encr, (unsigned char )&k,	1101
915	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	1102	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
		1103	{
916	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?"),
917	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));
		1106	}
918	else	1107	else
919	{	1108	{
920	delete octx;	1109	bool chg = !have_rcv_auth \|\| !slow_memeq (&rcv_auth, &auth, sizeof auth);
921		1110
922	octx = new crypto_ctx (k, 1);	1111	rcv_auth = auth;
923	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1112	have_rcv_auth = true;
924		1113
		1114	send_auth_response (rsi);
		1115
		1116	if (chg)
		1117	{
925	conf->protocols = p->protocols;	1118	conf->protocols = p->protocols;
		1119	features = p->features & config_packet::get_features ();
926		1120
927	send_auth_response (rsi, p->id, k);
928
929	connection_established ();	1121	connection_established (rsi);
930
931	break;	1122	}
932	}	1123	}
		1124
		1125	break;
933	}	1126	}
934	else
935	slog (L_WARN, _("%s(%s): protocol mismatch"),
936	conf->nodename, (const char *)rsi);
937		1127
938	send_reset (rsi);	1128	send_reset (rsi);
939	}	1129	}
940		1130
941	break;	1131	break;
942		1132
943	case vpn_packet::PT_AUTH_RES:	1133	case vpn_packet::PT_AUTH_RES:
944	{	1134	{
945	auth_res_packet p = (auth_res_packet ) pkt;	1135	auth_res_packet p = (auth_res_packet )pkt;
946		1136
947	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1137	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
948		1138
949	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))
950	{	1143	{
951	if (p->prot_minor != PROTOCOL_MINOR)
952	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
953	conf->nodename, (const char *)rsi,
954	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
955
956	rsachallenge chg;
957
958	if (!rsa_cache.find (p->id, chg))
959	{
960	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1144	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
961	conf->nodename, (const char *)rsi);	1145	conf->nodename, (const char *)rsi);
962	break;
963	}	1146	}
964	else	1147	else if (!have_snd_auth)
965	{	1148	{
966	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1149	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
967		1150
968	if (!p->hmac_chk (cctx))	1151	have_snd_auth = true;
969	{
970	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
971	"could be an attack, or just corruption or an synchronization error"),
972	conf->nodename, (const char *)rsi);
973	break;
974	}
975	else
976	{
977	rsaresponse h;
978
979	rsa_hash (p->id, chg, h);
980
981	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
982	{
983	prot_minor = p->prot_minor;
984
985	delete ictx; ictx = cctx;
986
987	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
988
989	si = rsi;
990	protocol = rsi.prot;
991
992	connection_established ();	1152	connection_established (rsi);
993
994	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
995	conf->nodename, (const char *)rsi,
996	p->prot_major, p->prot_minor);
997
998	if (::conf.script_node_up)
999	run_script (run_script_cb (this, &connection::script_node_up), false);
1000
1001	break;
1002	}
1003	else
1004	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1005	conf->nodename, (const char *)rsi);
1006	}
1007
1008	delete cctx;
1009	}
1010	}	1153	}
1011	}	1154	}
1012
1013	send_reset (rsi);
1014	break;	1155	break;
1015		1156
1016	case vpn_packet::PT_DATA_COMPRESSED:	1157	case vpn_packet::PT_DATA_COMPRESSED:
1017	#if !ENABLE_COMPRESSION	1158	#if !ENABLE_COMPRESSION
1018	send_reset (rsi);	1159	send_reset (rsi);
…		…
1024	if (ictx && octx)	1165	if (ictx && octx)
1025	{	1166	{
1026	vpndata_packet p = (vpndata_packet )pkt;	1167	vpndata_packet p = (vpndata_packet )pkt;
1027		1168
1028	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	{
1029	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"
1030	"could be an attack, or just corruption or an synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1031	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
		1187	// reset
		1188	}
		1189	}
1032	else	1190	else
1033	{	1191	{
1034	u32 seqno;	1192	u32 seqno;
1035	tap_packet *d = p->unpack (this, seqno);	1193	tap_packet *d = p->unpack (this, seqno);
		1194	int seqclass = iseqno.seqno_classify (seqno);
1036		1195
1037	if (iseqno.recv_ok (seqno))	1196	hmac_error = 0;
		1197
		1198	if (seqclass == 0) // ok
1038	{	1199	{
1039	vpn->tap->send (d);	1200	vpn->tap->send (d);
1040		1201
1041	if (si != rsi)	1202	if (si != rsi)
1042	{	1203	{
1043	// 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.)
1044	si = rsi;	1206	// {
1045
1046	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1207	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1047	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);
1048	}	1223	}
1049
1050	delete d;
1051
1052	break;
1053	}	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;
1054	}	1240	}
1055	}	1241	}
1056		1242
1057	send_reset (rsi);	1243	send_reset (rsi);
1058	break;	1244	break;
1059		1245
1060	case vpn_packet::PT_CONNECT_REQ:	1246	case vpn_packet::PT_CONNECT_REQ:
1061	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1247	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1062	{	1248	{
1063	connect_req_packet p = (connect_req_packet ) pkt;	1249	connect_req_packet p = (connect_req_packet )pkt;
1064		1250
1065	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 ())
1066	connection *c = vpn->conns[p->id - 1];
1067	conf->protocols = p->protocols;
1068
1069	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1070	conf->id, p->id, c->ictx && c->octx);
1071
1072	if (c->ictx && c->octx)
1073	{	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	{
1074	// send connect_info packets to both sides, in case one is	1263	// send connect_info packets to both sides, in case one is
1075	// behind a nat firewall (or both ;)	1264	// behind a nat firewall (or both ;)
1076	c->send_connect_info (conf->id, si, conf->protocols);	1265	c->send_connect_info (conf->id, si, conf->protocols);
1077	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 ();
1078	}	1270	}
1079	else	1271	else
1080	c->establish_connection ();	1272	slog (L_WARN,
		1273	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1274	p->id);
1081	}	1275	}
1082		1276
1083	break;	1277	break;
1084		1278
1085	case vpn_packet::PT_CONNECT_INFO:	1279	case vpn_packet::PT_CONNECT_INFO:
1086	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1280	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1087	{	1281	{
1088	connect_info_packet p = (connect_info_packet ) pkt;	1282	connect_info_packet p = (connect_info_packet )pkt;
1089		1283
1090	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 ())
1091		1285	{
1092	connection *c = vpn->conns[p->id - 1];	1286	connection *c = vpn->conns[p->id - 1];
1093		1287
1094	c->conf->protocols = p->protocols;	1288	c->conf->protocols = p->protocols;
1095	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));
1096	p->si.upgrade_protocol (protocol, c->conf);	1290	p->si.upgrade_protocol (protocol, c->conf);
1097		1291
1098	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]",
1099	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);
1100		1300
1101	const sockinfo &dsi = forward_si (p->si);	1301	const sockinfo &dsi = forward_si (p->si);
1102		1302
1103	if (dsi.valid ())	1303	if (dsi.valid ())
1104	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);
1105	}	1314	}
1106		1315
1107	break;	1316	break;
1108		1317
1109	default:	1318	default:
1110	send_reset (rsi);	1319	send_reset (rsi);
1111	break;	1320	break;
1112	}	1321	}
1113	}	1322	}
1114		1323
1115	void connection::keepalive_cb (time_watcher &w)	1324	inline void
		1325	connection::keepalive_cb (ev::timer &w, int revents)
1116	{	1326	{
1117	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)
1118	{	1332	{
1119	reset_connection ();	1333	reset_connection ("keepalive overdue");
1120	establish_connection ();	1334	establish_connection ();
1121	}	1335	}
1122	else if (NOW < last_activity + ::conf.keepalive)
1123	w.at = last_activity + ::conf.keepalive;
1124	else if (conf->connectmode != conf_node::C_ONDEMAND	1336	else if (conf->connectmode != conf_node::C_ONDEMAND
1125	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1337	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1126	{	1338	{
		1339	w.start (3);
1127	send_ping (si);	1340	send_ping (si);
1128	w.at = NOW + 5;
1129	}	1341	}
1130	else if (NOW < last_activity + ::conf.keepalive + 10)	1342	else if (when >= -10)
1131	// hold ondemand connections implicitly a few seconds longer	1343	// hold ondemand connections implicitly a few seconds longer
1132	// should delete octx, though, or something like that ;)	1344	// should delete octx, though, or something like that ;)
1133	w.at = last_activity + ::conf.keepalive + 10;	1345	w.start (when + 10);
1134	else	1346	else
1135	reset_connection ();	1347	reset_connection ("keepalive timeout");
1136	}	1348	}
1137		1349
		1350	void
1138	void connection::send_connect_request (int id)	1351	connection::send_connect_request (int id)
1139	{	1352	{
1140	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);
1141		1354
1142	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);
1143	p->hmac_set (octx);	1358	p->hmac_set (octx);
1144	send_vpn_packet (p, si);	1359	send_vpn_packet (p, si);
1145		1360
1146	delete p;	1361	delete p;
1147	}	1362	}
1148		1363
1149	void connection::script_node ()	1364	void
		1365	connection::script_init_env (const char *ext)
1150	{	1366	{
1151	vpn->script_if_up ();
1152
1153	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;
1154	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);
1155	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1383	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1156	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1384	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1157	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1385	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1158	}	1386	}
1159		1387
		1388	inline const char *
1160	const char *connection::script_node_up ()	1389	connection::script_node_up ()
1161	{	1390	{
1162	script_node ();	1391	script_init_connect_env ();
1163		1392
1164	putenv ("STATE=up");	1393	putenv ((char *)"STATE=up");
1165		1394
		1395	char *filename;
		1396	asprintf (&filename,
		1397	"%s/%s",
		1398	confbase,
1166	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1399	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1167	}
1168		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 *
1169	const char *connection::script_node_down ()	1421	connection::script_node_down ()
1170	{	1422	{
1171	script_node ();	1423	script_init_connect_env ();
1172		1424
1173	putenv ("STATE=down");	1425	putenv ((char *)"STATE=down");
1174		1426
1175	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1427	char *filename;
1176	}	1428	asprintf (&filename,
		1429	"%s/%s",
		1430	confbase,
		1431	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1177		1432
		1433	return filename;
		1434	}
		1435
1178	connection::connection(struct vpn *vpn_)	1436	connection::connection (struct vpn vpn, conf_node conf)
1179	: vpn(vpn_)	1437	: vpn(vpn), conf(conf),
1180	, rekey (this, &connection::rekey_cb)	1438	#if ENABLE_DNS
1181	, 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);
1182	, establish_connection (this, &connection::establish_connection_cb)	1446	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1183	{	1447
		1448	last_establish_attempt = 0.;
1184	octx = ictx = 0;	1449	octx = ictx = 0;
1185	retry_cnt = 0;
1186		1450
1187	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
1188	reset_connection ();	1457	reset_connection ("startup");
1189	}	1458	}
1190		1459
1191	connection::~connection ()	1460	connection::~connection ()
1192	{	1461	{
1193	shutdown ();	1462	shutdown ();
1194	}	1463	}
1195		1464
		1465	void
1196	void connection_init ()	1466	connection_init ()
1197	{	1467	{
1198	auth_rate_limiter.clear ();	1468	auth_rate_limiter.clear ();
1199	reset_rate_limiter.clear ();	1469	reset_rate_limiter.clear ();
1200	}	1470	}
1201		1471

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Comparing gvpe/src/connection.C (file contents): Revision 1.22 by pcg, Thu Oct 16 02:41:21 2003 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 1.22 by pcg, Thu Oct 16 02:41:21 2003 UTC vs.
Revision 1.116 by root, Mon Apr 1 03:10:26 2019 UTC