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Comparing gvpe/src/connection.C (file contents):
Revision 1.47 by pcg, Mon Mar 7 01:31:26 2005 UTC vs.
Revision 1.116 by root, Mon Apr 1 03:10:26 2019 UTC

1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013,2016 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <cassert>
25
26	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
27		37
		38	#include <openssl/opensslv.h>
28	#include <openssl/rand.h>	39	#include <openssl/rand.h>
29	#include <openssl/evp.h>	40	#include <openssl/evp.h>
30	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
31	#include <openssl/err.h>	42	#include <openssl/err.h>
32		43
33	#include "gettext.h"
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
48		55
		56	#define LZF_STATE_ARG 1
49	#define ULTRA_FAST 1	57	#define ULTRA_FAST 1
50	#define HLOG 15	58	#define HLOG 15
51	#include "lzf/lzf.h"	59	#define INIT_HTAB 0
52	#include "lzf/lzf_c.c"	60	#include "lzf/lzf_c.c"
53	#include "lzf/lzf_d.c"	61	#include "lzf/lzf_d.c"
54		62
		63	//////////////////////////////////////////////////////////////////////////////
		64
		65	static std::queue< std::pair<run_script_cb *, const char *> > rs_queue;
		66	static ev::child rs_child_ev;
		67
		68	namespace
		69	{
		70	void // c++ requires external linkage here, apparently :(
		71	rs_child_cb (ev::child &w, int revents)
		72	{
		73	w.stop ();
		74
		75	if (rs_queue.empty ())
		76	return;
		77
		78	pid_t pid = run_script (*rs_queue.front ().first, false);
		79	if (pid)
		80	{
		81	w.set (pid);
		82	w.start ();
		83	}
		84	else
		85	slog (L_WARN, rs_queue.front ().second);
		86
		87	delete rs_queue.front ().first;
		88	rs_queue.pop ();
		89	}
		90	};
		91
		92	// despite the fancy name, this is quite a hack
		93	static void
		94	run_script_queued (run_script_cb *cb, const char *warnmsg)
		95	{
		96	rs_queue.push (std::make_pair (cb, warnmsg));
		97
		98	if (!rs_child_ev.is_active ())
		99	{
		100	rs_child_ev.set<rs_child_cb> ();
		101	rs_child_ev ();
		102	}
		103	}
		104
		105	//////////////////////////////////////////////////////////////////////////////
		106
55	struct crypto_ctx	107	struct crypto_ctx
56	{	108	{
57	EVP_CIPHER_CTX cctx;	109	cipher cctx;
58	HMAC_CTX hctx;	110	hmac hctx;
59		111
60	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);
61	~crypto_ctx ();	113	~crypto_ctx ();
62	};	114	};
63		115
64	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)
65	{	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
66	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (cctx);
67	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	146	require (EVP_CipherInit_ex (cctx, CIPHER (), 0, cipher_key, 0, enc));
68	HMAC_CTX_init (&hctx);	147	}
69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
70	}	148	}
71		149
72	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
73	{	151	{
74	require (EVP_CIPHER_CTX_cleanup (&cctx));	152	require (EVP_CIPHER_CTX_cleanup (cctx));
75	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;
76	}	180	}
77		181
78	static void	182	static void
79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
80	{	184	{
81	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
82		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
83	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
84	require (EVP_DigestInit (&ctx, RSA_HASH));	188	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
85	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
86	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
87	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
88	EVP_MD_CTX_cleanup (&ctx);
89	}	189	}
90		190
91	struct rsa_entry {	191	void
92	tstamp expire;	192	connection::generate_auth_data ()
93	rsaid id;
94	rsachallenge chg;
95	};
96
97	struct rsa_cache : list<rsa_entry>
98	{	193	{
99	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	if (auth_expire < ev_now ())
100
101	bool find (const rsaid &id, rsachallenge &chg)
102	{
103	for (iterator i = begin (); i != end (); ++i)
104	{
105	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
106	{
107	memcpy (&chg, &i->chg, sizeof chg);
108
109	erase (i);
110	return true;
111	}
112	}
113
114	if (cleaner.at < NOW)
115	cleaner.start (NOW + RSA_TTL);
116
117	return false;
118	}
119
120	void gen (rsaid &id, rsachallenge &chg)
121	{
122	rsa_entry e;
123
124	RAND_bytes ((unsigned char *)&id, sizeof id);
125	RAND_bytes ((unsigned char *)&chg, sizeof chg);
126
127	e.expire = NOW + RSA_TTL;
128	e.id = id;
129	memcpy (&e.chg, &chg, sizeof chg);
130
131	push_back (e);
132
133	if (cleaner.at < NOW)
134	cleaner.start (NOW + RSA_TTL);
135	}
136
137	rsa_cache ()
138	: cleaner (this, &rsa_cache::cleaner_cb)
139	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
140		199
141	} rsa_cache;	200	// eventual response data
142		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
143	void rsa_cache::cleaner_cb (time_watcher &w)
144	{
145	if (!empty ())
146	{	202	}
147	w.start (NOW + RSA_TTL);
148		203
149	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
150	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
151	i = erase (i);
152	else
153	++i;
154	}
155	}	206	}
156		207
157	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
158		209
159	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)
160	{	212	{
161	if (queue[i])	213	queue = new pkt [max_queue];
162	{
163	delete queue[i];
164	j = (j + 1) % QUEUEDEPTH;
165	}
166		214
167	queue[i] = p;
168
169	i = (i + 1) % QUEUEDEPTH;
170	}
171
172	net_packet *pkt_queue::get ()
173	{
174	net_packet *p = queue[j];
175
176	if (p)
177	{
178	queue[j] = 0;
179	j = (j + 1) % QUEUEDEPTH;
180	}
181
182	return p;
183	}
184
185	pkt_queue::pkt_queue ()
186	{
187	memset (queue, 0, sizeof (queue));
188	i = 0;	215	i = 0;
189	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
190	}	219	}
191		220
192	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
193	{	222	{
194	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
195	delete queue[i];	226	delete [] queue;
196	}	227	}
197		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
198	struct net_rateinfo {	285	struct net_rateinfo
		286	{
199	u32 host;	287	u32 host;
200	double pcnt, diff;	288	double pcnt, diff;
201	tstamp last;	289	tstamp last;
202	};	290	};
203		291
…		…
213		301
214	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
215	bool can (u32 host);	303	bool can (u32 host);
216	};	304	};
217		305
218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
219		307
		308	bool
220	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
221	{	310	{
222	iterator i;	311	iterator i;
223		312
224	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
225	if (i->host == host)	314	if (i->host == host)
226	break;	315	break;
227	else if (i->last < NOW - NRL_EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
228	i = erase (i);	317	i = erase (i);
229	else	318	else
230	i++;	319	i++;
231		320
232	if (i == end ())	321	if (i == end ())
…		…
234	net_rateinfo ri;	323	net_rateinfo ri;
235		324
236	ri.host = host;	325	ri.host = host;
237	ri.pcnt = 1.;	326	ri.pcnt = 1.;
238	ri.diff = NRL_MAXDIF;	327	ri.diff = NRL_MAXDIF;
239	ri.last = NOW;	328	ri.last = ev_now ();
240		329
241	push_front (ri);	330	push_front (ri);
242		331
243	return true;	332	return true;
244	}	333	}
…		…
246	{	335	{
247	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
248	erase (i);	337	erase (i);
249		338
250	ri.pcnt = ri.pcnt * NRL_ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
252		341
253	ri.last = NOW;	342	ri.last = ev_now ();
254		343
255	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
256		345
257	bool send = dif > NRL_CUTOFF;	346	bool send = dif > NRL_CUTOFF;
258		347
…		…
270	}	359	}
271	}	360	}
272		361
273	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
274		363
275	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
276
277	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx *ctx, u8 *hmac_digest)
278	{	366	{
279	unsigned int xlen;	367	ctx->hctx.init ();
280		368	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
281	HMAC_CTX *hctx = &ctx->hctx;	369	ctx->hctx.digest (hmac_digest);
282
283	HMAC_Init_ex (hctx, 0, 0, 0, 0);
284	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
285	len - sizeof (hmac_packet));
286	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
287	}	370	}
288		371
289	void	372	void
290	hmac_packet::hmac_set (crypto_ctx *ctx)	373	hmac_packet::hmac_set (crypto_ctx *ctx)
291	{	374	{
292	hmac_gen (ctx);	375	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
293		376	hmac_gen (ctx, hmac_digest);
294	memcpy (hmac, hmac_digest, HMACLENGTH);	377	memcpy (hmac, hmac_digest, HMACLENGTH);
295	}	378	}
296		379
297	bool	380	bool
298	hmac_packet::hmac_chk (crypto_ctx *ctx)	381	hmac_packet::hmac_chk (crypto_ctx *ctx)
299	{	382	{
300	hmac_gen (ctx);	383	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
301		384	hmac_gen (ctx, hmac_digest);
302	return !memcmp (hmac, hmac_digest, HMACLENGTH);	385	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
303	}	386	}
304		387
		388	void
305	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	389	vpn_packet::set_hdr (ptype type_, unsigned int dst)
306	{	390	{
307	type = type_;	391	type = type_;
308		392
309	int src = THISNODE->id;	393	int src = THISNODE->id;
310		394
…		…
312	srcdst = ((src >> 8) << 4) | (dst >> 8);	396	srcdst = ((src >> 8) << 4) | (dst >> 8);
313	dst1 = dst;	397	dst1 = dst;
314	}	398	}
315		399
316	#define MAXVPNDATA (MAX_MTU - 6 - 6)	400	#define MAXVPNDATA (MAX_MTU - 6 - 6)
317	#define DATAHDR (sizeof (u32) + RAND_SIZE)
318		401
319	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
320	{	412	{
321	u8 data[MAXVPNDATA + DATAHDR]; // seqno	413	// the distance from beginning of packet to data member
322		414	return data - at (0);
323	void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno);
324	tap_packet *unpack (connection *conn, u32 &seqno);
325	private:
326
327	const u32 data_hdr_size () const
328	{
329	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
330	}
331	};	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	}
332		439
333	void	440	void
334	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)
335	{	442	{
336	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	443	EVP_CIPHER_CTX *cctx = conn->octx->cctx;
337	int outl = 0, outl2;	444	int outl = 0, outl2;
338	ptype type = PT_DATA_UNCOMPRESSED;	445	ptype type = PT_DATA_UNCOMPRESSED;
339		446
340	#if ENABLE_COMPRESSION	447	#if ENABLE_COMPRESSION
341	u8 cdata[MAX_MTU];	448	u8 cdata[MAX_MTU];
342		449
343	if (conn->features & ENABLE_COMPRESSION)	450	if (conn->features & FEATURE_COMPRESSION)
344	{	451	{
		452	static LZF_STATE lzf_state;
345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	453	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7, lzf_state);
346		454
347	if (cl)	455	if (cl)
348	{	456	{
349	type = PT_DATA_COMPRESSED;	457	type = PT_DATA_COMPRESSED;
350	d = cdata;	458	d = cdata;
…		…
354	d[1] = cl;	462	d[1] = cl;
355	}	463	}
356	}	464	}
357	#endif	465	#endif
358		466
		467	ctr = htonl (seqno);
		468
359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	469	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
360
361	struct {
362	#if RAND_SIZE
363	u8 rnd[RAND_SIZE];
364	#endif
365	u32 seqno;
366	} datahdr;
367
368	datahdr.seqno = ntohl (seqno);
369	#if RAND_SIZE
370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
371	#endif
372		470
373	require (EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
374	(unsigned char *) data + outl, &outl2,	472	(unsigned char *)data + outl, &outl2,
375	(unsigned char *) &datahdr, DATAHDR));	473	(unsigned char *)d, l));
376	outl += outl2;	474	outl += outl2;
377		475
378	require (EVP_EncryptUpdate (cctx,	476	// it seems this is a nop for us, but we do it anyways
379	(unsigned char *) data + outl, &outl2,	477	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
380	(unsigned char *) d, l));
381	outl += outl2;	478	outl += outl2;
382		479
383	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
384	outl += outl2;
385
386	len = outl + data_hdr_size ();	480	len = data_hdr_size () + outl;
387		481
388	set_hdr (type, dst);	482	set_hdr (type, dst);
389		483
390	hmac_set (conn->octx);	484	hmac_set (conn->octx);
391	}	485	}
392		486
393	tap_packet *	487	tap_packet *
394	vpndata_packet::unpack (connection *conn, u32 &seqno)	488	vpndata_packet::unpack (connection *conn, u32 &seqno)
395	{	489	{
396	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	490	EVP_CIPHER_CTX *cctx = conn->ictx->cctx;
397	int outl = 0, outl2;	491	int outl = 0, outl2;
398	tap_packet *p = new tap_packet;	492	tap_packet *p = new tap_packet;
399	u8 *d;	493	u8 *d;
400	u32 l = len - data_hdr_size ();
401		494
		495	seqno = ntohl (ctr);
		496
402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
403		498
404	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
405	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
406		501
407	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
408	d = cdata;	503	d = cdata;
409	else	504	else
410	#endif	505	#endif
411	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6];
412		507
413	/* this overwrites part of the src mac, but we fix that later */	508	// this can overwrite the len/dst/src fields
414	require (EVP_DecryptUpdate (cctx,	509	require (EVP_DecryptUpdate (cctx,
415	d, &outl2,	510	d, &outl2,
416	(unsigned char *)&data, len - data_hdr_size ()));	511	(unsigned char *)&data, len - data_hdr_size ()));
417	outl += outl2;	512	outl += outl2;
418		513
		514	// it seems this is a nop for us, but we do it anyways
419	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
420	outl += outl2;	516	outl += outl2;
421		517
422	seqno = ntohl (*(u32 *)(d + RAND_SIZE));
423
424	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
425	id2mac (src (), p->src);	519	id2mac (src (), p->src);
426		520
427	#if ENABLE_COMPRESSION	521	#if ENABLE_COMPRESSION
428	if (type == PT_DATA_COMPRESSED)	522	if (type == PT_DATA_COMPRESSED)
429	{	523	{
430	u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1];	524	u32 cl = (d[0] << 8) | d[1];
431		525
432	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,
433	&(*p)[6 + 6], MAX_MTU)	527	&(*p)[6 + 6], MAX_MTU)
434	+ 6 + 6;	528	+ 6 + 6;
435	}	529	}
436	else	530	else
437	p->len = outl + (6 + 6 - DATAHDR);	531	p->len = outl + (6 + 6);
438	#endif	532	#endif
439		533
440	return p;	534	return p;
441	}	535	}
442		536
…		…
449	}	543	}
450	};	544	};
451		545
452	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
453	{	547	{
454	// actually, hmaclen cannot be checked because the hmac	548	u8 serial[SERIAL_SIZE];
455	// field comes before this data, so peers with other
456	// hmacs simply will not work.
457	u8 prot_major, prot_minor, randsize, hmaclen;	549	u8 prot_major, prot_minor, randsize;
458	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
459	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
460		552
461	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
462	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
463		555
464	static u8 get_features ()	556	static u8 get_features ()
465	{	557	{
466	u8 f = 0;	558	u8 f = 0;
467	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
468	f |= FEATURE_COMPRESSION;	560	f |= FEATURE_COMPRESSION;
469	#endif	561	#endif
470	#if ENABLE_ROHC	562	#if ENABLE_ROHC
471	f |= FEATURE_ROHC;	563	f |= FEATURE_ROHC;
472	#endif	564	#endif
		565	#if ENABLE_BRIDGING
		566	f |= FEATURE_BRIDGING;
		567	#endif
473	return f;	568	return f;
474	}	569	}
475	};	570	};
476		571
		572	void
477	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
478	{	574	{
479	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
480	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
481	randsize = RAND_SIZE;	577	flags = 0;
482	hmaclen = HMACLENGTH;
483	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
484	challengelen = sizeof (rsachallenge);
485	features = get_features ();	578	features = get_features ();
486		579
		580	strncpy ((char *)serial, conf.serial, sizeof (serial));
		581
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	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 ()));
490		585
491	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
492	set_hdr (type, dst);	587	set_hdr (type, dst);
493	}	588	}
494		589
495	bool config_packet::chk_config () const	590	bool
		591	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
496	{	592	{
497	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
498	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)"),
499	else if (randsize != RAND_SIZE)	595	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
500	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
501	else if (hmaclen != HMACLENGTH)
502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503	#if 0 // this implementation should handle all flag settings
504	else if (flags != curflags ())
505	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
506	#endif
507	else if (challengelen != sizeof (rsachallenge))
508	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
509	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	596	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
510	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	597	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
511	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	598	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
512	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
513	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	599	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
514	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	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 ()));
515	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)
516	return true;	613	return true;
		614	}
517		615
518	return false;	616	return false;
519	}	617	}
520		618
521	struct auth_req_packet : config_packet	619	struct auth_req_packet : config_packet // UNPROTECTED
522	{	620	{
523	char magic[8];	621	char magic[8];
524	u8 initiate; // false if this is just an automatic reply	622	u8 initiate; // false if this is just an automatic reply
525	u8 protocols; // supported protocols (will be patched on forward)	623	u8 protocols; // supported protocols (will be patched on forward)
526	u8 pad2, pad3;	624	u8 pad2, pad3;
527	rsaid id;	625	auth_encr encr;
528	rsaencrdata encr;
529		626
530	auth_req_packet (int dst, bool initiate_, u8 protocols_)	627	auth_req_packet (int dst, bool initiate_, u8 protocols_)
531	{	628	{
532	config_packet::setup (PT_AUTH_REQ, dst);	629	config_packet::setup (PT_AUTH_REQ, dst);
533	strncpy (magic, MAGIC, 8);	630	memcpy (magic, MAGIC, 8);
534	initiate = !!initiate_;	631	initiate = !!initiate_;
535	protocols = protocols_;	632	protocols = protocols_;
536		633
537	len = sizeof (*this) - sizeof (net_packet);	634	len = sizeof (*this) - sizeof (net_packet);
538	}	635	}
539	};	636	};
540		637
541	struct auth_res_packet : config_packet	638	struct auth_res_packet : vpn_packet // UNPROTECTED
542	{	639	{
543	rsaid id;
544	u8 pad1, pad2, pad3;
545	u8 response_len; // encrypted length
546	rsaresponse response;	640	auth_response response;
547		641
548	auth_res_packet (int dst)	642	auth_res_packet (int dst)
549	{	643	{
550	config_packet::setup (PT_AUTH_RES, dst);	644	set_hdr (PT_AUTH_RES, dst);
551		645
552	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
553	}	647	}
554	};	648	};
555		649
…		…
585	};	679	};
586		680
587	/////////////////////////////////////////////////////////////////////////////	681	/////////////////////////////////////////////////////////////////////////////
588		682
589	void	683	void
590	connection::connection_established ()	684	connection::connection_established (const sockinfo &rsi)
591	{	685	{
592	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."));
593	{	702	}
594	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);
595		706
		707	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		708	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		709
596	// make sure rekeying timeouts are slightly asymmetric	710	// make sure rekeying timeouts are slightly asymmetric
597	rekey.start (NOW + ::conf.rekey	711	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
598	+ (conf->id > THISNODE->id ? 10 : 0));	712	rekey.start (rekey_interval, rekey_interval);
		713
		714	hmac_error = 0.;
		715
599	keepalive.start (NOW + ::conf.keepalive);	716	keepalive.start (::conf.keepalive);
600		717
601	// send queued packets	718	// send queued packets
602	if (ictx && octx)
603	{
604	while (tap_packet *p = (tap_packet *)data_queue.get ())	719	while (tap_packet *p = (tap_packet *)data_queue.get ())
605	{	720	{
606	send_data_packet (p);	721	if (p->len) send_data_packet (p);
607	delete p;	722	delete p;
608	}	723	}
609		724
610	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())	725	while (vpn_packet *p = (vpn_packet *)vpn_queue.get ())
611	{	726	{
612	send_vpn_packet (p, si, IPTOS_RELIABILITY);	727	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
613	delete p;	728	delete p;
614	}
615	}
616	}	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 ());
617	else	739	else
618	{	740	{
619	retry_cnt = 0;	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
620	establish_connection.start (NOW + 5);	742	protocol = 0;
621	keepalive.stop ();
622	rekey.stop ();
623	}	743	}
624	}
625
626	void
627	connection::reset_si ()
628	{
629	protocol = best_protocol (THISNODE->protocols & conf->protocols);
630
631	// mask out protocols we cannot establish
632	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
633	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
634	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
635		744
636	si.set (conf, protocol);	745	si.set (conf, protocol);
637	}	746	}
638		747
639	// ensure sockinfo is valid, forward if necessary	748	// ensure sockinfo is valid, forward if necessary
640	const sockinfo &	749	const sockinfo &
641	connection::forward_si (const sockinfo &si) const	750	connection::forward_si (const sockinfo &si) const
642	{	751	{
643	if (!si.valid ())	752	if (!si.valid ())
644	{	753	{
645	connection *r = vpn->find_router ();	754	connection *r = vpn->find_router_for (this);
646		755
647	if (r)	756	if (r)
648	{	757	{
649	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	758	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
650	conf->nodename, r->conf->nodename, (const char *)r->si);	759	conf->nodename, r->conf->nodename);
651	return r->si;	760	return r->si;
652	}	761	}
653	else	762	else
654	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	763	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
655	conf->nodename);	764	conf->nodename);
656	}	765	}
657		766
658	return si;	767	return si;
659	}	768	}
660		769
661	void	770	void
662	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)
663	{	772	{
664	if (!vpn->send_vpn_packet (pkt, si, tos))	773	if (!vpn->send_vpn_packet (pkt, si, tos))
665	reset_connection ();	774	reset_connection ("packet send error");
666	}	775	}
667		776
668	void	777	void
669	connection::send_ping (const sockinfo &si, u8 pong)	778	connection::send_ping (const sockinfo &si, u8 pong)
670	{	779	{
671	ping_packet *pkt = new ping_packet;	780	ping_packet *pkt = new ping_packet;
672		781
673	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);
674	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	785	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
675		786
676	delete pkt;	787	delete pkt;
677	}	788	}
678		789
…		…
693	void	804	void
694	connection::send_auth_request (const sockinfo &si, bool initiate)	805	connection::send_auth_request (const sockinfo &si, bool initiate)
695	{	806	{
696	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);
697		808
698	rsachallenge chg;	809	generate_auth_data ();
699	rsa_cache.gen (pkt->id, chg);
700	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	810	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
701		811
702	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);
703
704	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
705		814
706	delete pkt;	815	delete pkt;
707	}	816	}
708		817
709	void	818	void
710	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	819	connection::send_auth_response (const sockinfo &si)
711	{	820	{
712	auth_res_packet *pkt = new auth_res_packet (conf->id);	821	auth_res_packet *pkt = new auth_res_packet (conf->id);
713		822
714	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);
715		825
716	rsa_hash (id, chg, pkt->response);
717
718	pkt->hmac_set (octx);
719
720	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
721
722	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
723		828
724	delete pkt;	829	delete pkt;
725	}	830	}
726		831
727	void	832	void
728	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	833	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
729	{	834	{
730	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	835	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
731	conf->id, rid, (const char *)rsi);	836	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		837	conf->protocols);
732		838
733	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);
734		840
735	r->hmac_set (octx);	841	r->hmac_set (octx);
736	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
737		843
738	delete r;	844	delete r;
739	}	845	}
740		846
741	void	847	inline void
742	connection::establish_connection_cb (time_watcher &w)	848	connection::establish_connection_cb (ev::timer &w, int revents)
743	{	849	{
744	if (!ictx	850	if (!(ictx && octx)
745	&& conf != THISNODE	851	&& conf != THISNODE
746	&& connectmode != conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
747	&& connectmode != conf_node::C_DISABLED	853	&& connectmode != conf_node::C_DISABLED
748	&& NOW > w.at)	854	&& !w.is_active ())
749	{	855	{
750	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion	856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
		857	// and stop trying. should probably be handled by a per-connection expire handler.
		858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ("no demand");
		861	return;
		862	}
751		863
752	double retry_int = double (retry_cnt & 3	864	last_establish_attempt = ev_now ();
		865
		866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
753	? (retry_cnt & 3) + 1	867	? (retry_cnt & 3) + 1
754	: 1 << (retry_cnt >> 2));	868	: 1 << (retry_cnt >> 2));
755		869
756	reset_si ();	870	reset_si ();
757		871
758	bool slow = si.prot & PROT_SLOW;	872	bool slow = (si.prot & PROT_SLOW) || (conf->low_power || THISNODE->low_power);
759		873
760	if (si.prot && !si.host)	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);
761	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
		879	}
762	else	880	else
763	{	881	{
		882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
		885
764	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
765		887
766	slow = slow || (dsi.prot & PROT_SLOW);	888	slow = slow || (dsi.prot & PROT_SLOW);
767		889
768	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
769	{	891	{
770	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))
771	send_auth_request (dsi, true);	896	send_auth_request (dsi, true);
772	else	897	else
773	send_ping (dsi, 0);	898	send_ping (dsi, 0);
774	}	899	}
775	}	900	}
776		901
777	retry_int *= slow ? 3. : 0.7;	902	retry_int *= slow ? 4. : 0.9;
778		903
779	if (retry_int < conf->max_retry)	904	if (retry_int < conf->max_retry)
780	retry_cnt++;	905	retry_cnt++;
781	else	906	else
782	retry_int = conf->max_retry;	907	retry_int = conf->max_retry;
783		908
784	w.start (NOW + retry_int);	909	w.start (retry_int);
785	}	910	}
786	}	911	}
787		912
788	void	913	void
789	connection::reset_connection ()	914	connection::reset_connection (const char *reason)
790	{	915	{
791	if (ictx && octx)	916	if (ictx && octx)
792	{	917	{
793	slog (L_INFO, _("%s(%s): connection lost"),	918	slog (L_INFO, _("%s(%s): connection lost (%s)"),
794	conf->nodename, (const char *)si);	919	conf->nodename, (const char *)si, reason);
795		920
796	if (::conf.script_node_down)	921	if (::conf.script_node_down)
797	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	}
798	}	927	}
799		928
800	delete ictx; ictx = 0;	929	delete ictx; ictx = 0;
801	delete octx; octx = 0;	930	delete octx; octx = 0;
802	#if ENABLE_DNS
803	dnsv4_reset_connection ();
804	#endif
805		931
806	si.host = 0;	932	si.host = 0;
807		933
		934	have_snd_auth = false;
		935	have_rcv_auth = false;
		936	auth_expire = 0.;
		937
808	last_activity = 0;	938	last_activity = 0.;
		939	//last_si_change = 0.;
809	retry_cnt = 0;	940	retry_cnt = 0;
810		941
811	rekey.stop ();	942	rekey.stop ();
812	keepalive.stop ();	943	keepalive.stop ();
813	establish_connection.stop ();	944	establish_connection.stop ();
…		…
817	connection::shutdown ()	948	connection::shutdown ()
818	{	949	{
819	if (ictx && octx)	950	if (ictx && octx)
820	send_reset (si);	951	send_reset (si);
821		952
822	reset_connection ();	953	reset_connection ("shutdown");
823	}	954	}
824		955
825	void	956	// poor-man's rekeying
826	connection::rekey_cb (time_watcher &w)	957	inline void
		958	connection::rekey_cb (ev::timer &w, int revents)
827	{	959	{
828	reset_connection ();	960	reset_connection ("rekeying");
829	establish_connection ();	961	establish_connection ();
830	}	962	}
831		963
832	void	964	void
833	connection::send_data_packet (tap_packet *pkt)	965	connection::send_data_packet (tap_packet *pkt)
…		…
847	if (oseqno > MAX_SEQNO)	979	if (oseqno > MAX_SEQNO)
848	rekey ();	980	rekey ();
849	}	981	}
850		982
851	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
852	connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)	994	connection::inject_data_packet (tap_packet *pkt)
853	{	995	{
854	if (ictx && octx)	996	if (ictx && octx)
855	send_data_packet (pkt);	997	send_data_packet (pkt);
856	else	998	else
857	{	999	{
858	if (!broadcast)//DDDD
859	data_queue.put (new tap_packet (*pkt));	1000	data_queue.put (new tap_packet (*pkt));
860		1001	post_inject_queue ();
861	establish_connection ();
862	}	1002	}
863	}	1003	}
864		1004
		1005	void
865	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1006	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
866	{	1007	{
867	if (ictx && octx)	1008	if (ictx && octx)
868	send_vpn_packet (pkt, si, tos);	1009	send_vpn_packet (pkt, si, tos);
869	else	1010	else
870	{	1011	{
871	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));	1012	vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt));
872		1013	post_inject_queue ();
873	establish_connection ();
874	}	1014	}
875	}	1015	}
876		1016
877	void	1017	void
878	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1018	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
879	{	1019	{
880	last_activity = NOW;	1020	last_activity = ev_now ();
881		1021
882	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.",
883	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;
884		1027
885	switch (pkt->typ ())	1028	switch (pkt->typ ())
886	{	1029	{
887	case vpn_packet::PT_PING:	1030	case vpn_packet::PT_PING:
		1031	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1032
888	// we send pings instead of auth packets after some retries,	1033	// we send pings instead of auth packets after some retries,
889	// so reset the retry counter and establish a connection	1034	// so reset the retry counter and establish a connection
890	// when we receive a ping.	1035	// when we receive a ping.
891	if (!ictx)	1036	if (!ictx)
892	{	1037	{
893	if (auth_rate_limiter.can (rsi))	1038	if (auth_rate_limiter.can (rsi))
894	send_auth_request (rsi, true);	1039	send_auth_request (rsi, true);
895	}	1040	}
896	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.
897	send_ping (rsi, 1); // pong	1044	send_ping (rsi, 1); // pong
898		1045
899	break;	1046	break;
900		1047
901	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 ();
902	break;	1054	break;
903		1055
904	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)
905	{	1060	{
906	reset_connection ();	1061	reset_connection ("remote reset");
907		1062
908	config_packet *p = (config_packet *) pkt;	1063	config_packet *p = (config_packet *) pkt;
909		1064
910	if (!p->chk_config ())	1065	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
911	{
912	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
913	conf->nodename, (const char *)rsi);
914	connectmode = conf_node::C_DISABLED;
915	}
916	else if (connectmode == conf_node::C_ALWAYS)
917	establish_connection ();	1066	establish_connection ();
918	}	1067	}
		1068
919	break;	1069	break;
920		1070
921	case vpn_packet::PT_AUTH_REQ:	1071	case vpn_packet::PT_AUTH_REQ:
922	if (auth_rate_limiter.can (rsi))	1072	if (auth_rate_limiter.can (rsi))
923	{	1073	{
924	auth_req_packet *p = (auth_req_packet *) pkt;	1074	auth_req_packet *p = (auth_req_packet *)pkt;
925		1075
926	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);
927		1079
928	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))
929	{	1086	{
930	if (p->prot_minor != PROTOCOL_MINOR)	1087	if (p->prot_minor != PROTOCOL_MINOR)
931	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."),
932	conf->nodename, (const char *)rsi,	1089	conf->nodename, (const char *)rsi,
933	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1090	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
934		1091
935	if (p->initiate)	1092	if (p->initiate)
		1093	{
936	send_auth_request (rsi, false);	1094	send_auth_request (rsi, false);
937		1095
938	rsachallenge k;	1096	if (ictx && octx)
		1097	reset_connection ("reconnect");
		1098	}
939		1099
		1100	auth_data auth;
		1101
940	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1102	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
941	{	1103	{
942	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?"),
943	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));
944	break;
945	}	1106	}
946	else	1107	else
947	{	1108	{
948	delete octx;	1109	bool chg = !have_rcv_auth || !slow_memeq (&rcv_auth, &auth, sizeof auth);
949		1110
950	octx = new crypto_ctx (k, 1);	1111	rcv_auth = auth;
951	oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;	1112	have_rcv_auth = true;
952		1113
953	// compatibility code, remove when no longer required	1114	send_auth_response (rsi);
954	if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
955		1115
		1116	if (chg)
		1117	{
956	conf->protocols = p->protocols;	1118	conf->protocols = p->protocols;
957	features = p->features & config_packet::get_features ();	1119	features = p->features & config_packet::get_features ();
958		1120
959	send_auth_response (rsi, p->id, k);
960
961	connection_established ();	1121	connection_established (rsi);
962
963	break;	1122	}
964	}	1123	}
		1124
		1125	break;
965	}	1126	}
966	else
967	slog (L_WARN, _("%s(%s): protocol mismatch"),
968	conf->nodename, (const char *)rsi);
969		1127
970	send_reset (rsi);	1128	send_reset (rsi);
971	}	1129	}
972		1130
973	break;	1131	break;
974		1132
975	case vpn_packet::PT_AUTH_RES:	1133	case vpn_packet::PT_AUTH_RES:
976	{	1134	{
977	auth_res_packet *p = (auth_res_packet *) pkt;	1135	auth_res_packet *p = (auth_res_packet *)pkt;
978		1136
979	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1137	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
980		1138
981	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))
982	{	1143	{
983	if (p->prot_minor != PROTOCOL_MINOR)
984	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
985	conf->nodename, (const char *)rsi,
986	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
987
988	rsachallenge chg;
989
990	if (!rsa_cache.find (p->id, chg))
991	{
992	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1144	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
993	conf->nodename, (const char *)rsi);	1145	conf->nodename, (const char *)rsi);
994	break;
995	}	1146	}
996	else	1147	else if (!have_snd_auth)
997	{	1148	{
998	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1149	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
999		1150
1000	if (!p->hmac_chk (cctx))	1151	have_snd_auth = true;
1001	{
1002	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1003	"could be an attack, or just corruption or a synchronization error"),
1004	conf->nodename, (const char *)rsi);
1005	break;
1006	}
1007	else
1008	{
1009	rsaresponse h;
1010
1011	rsa_hash (p->id, chg, h);
1012
1013	if (!memcmp ((u8 *)&h, (u8 *)p->response, sizeof h))
1014	{
1015	prot_minor = p->prot_minor;
1016
1017	delete ictx; ictx = cctx;
1018
1019	iseqno.reset (ntohl (*(u32 *)&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1020
1021	si = rsi;
1022	protocol = rsi.prot;
1023
1024	connection_established ();	1152	connection_established (rsi);
1025
1026	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1027	conf->nodename, (const char *)rsi,
1028	p->prot_major, p->prot_minor);
1029
1030	if (::conf.script_node_up)
1031	run_script (run_script_cb (this, &connection::script_node_up), false);
1032
1033	break;
1034	}
1035	else
1036	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1037	conf->nodename, (const char *)rsi);
1038	}
1039
1040	delete cctx;
1041	}
1042	}	1153	}
1043	}	1154	}
1044
1045	send_reset (rsi);
1046	break;	1155	break;
1047		1156
1048	case vpn_packet::PT_DATA_COMPRESSED:	1157	case vpn_packet::PT_DATA_COMPRESSED:
1049	#if !ENABLE_COMPRESSION	1158	#if !ENABLE_COMPRESSION
1050	send_reset (rsi);	1159	send_reset (rsi);
…		…
1056	if (ictx && octx)	1165	if (ictx && octx)
1057	{	1166	{
1058	vpndata_packet *p = (vpndata_packet *)pkt;	1167	vpndata_packet *p = (vpndata_packet *)pkt;
1059		1168
1060	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	{
1061	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"
1062	"could be an attack, or just corruption or a synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1063	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
		1187	// reset
		1188	}
		1189	}
1064	else	1190	else
1065	{	1191	{
1066	u32 seqno;	1192	u32 seqno;
1067	tap_packet *d = p->unpack (this, seqno);	1193	tap_packet *d = p->unpack (this, seqno);
		1194	int seqclass = iseqno.seqno_classify (seqno);
1068		1195
1069	if (iseqno.recv_ok (seqno))	1196	hmac_error = 0;
		1197
		1198	if (seqclass == 0) // ok
1070	{	1199	{
1071	vpn->tap->send (d);	1200	vpn->tap->send (d);
1072		1201
1073	if (si != rsi)	1202	if (si != rsi)
1074	{	1203	{
1075	// 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.)
1076	si = rsi;	1206	// {
1077
1078	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1207	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1079	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);
1080	}	1223	}
		1224	}
		1225	else if (seqclass == 1) // far history
		1226	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1227	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1228	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1229	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1230	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1231	else if (seqclass == 3) // reset
		1232	{
		1233	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1234	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1235	send_reset (rsi);
1081	}	1236	}
1082		1237
1083	delete d;	1238	delete d;
1084	break;	1239	break;
1085	}	1240	}
…		…
1089	break;	1244	break;
1090		1245
1091	case vpn_packet::PT_CONNECT_REQ:	1246	case vpn_packet::PT_CONNECT_REQ:
1092	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1247	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1093	{	1248	{
1094	connect_req_packet *p = (connect_req_packet *) pkt;	1249	connect_req_packet *p = (connect_req_packet *)pkt;
1095		1250
1096	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 ())
1097	connection *c = vpn->conns[p->id - 1];
1098	conf->protocols = p->protocols;
1099
1100	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1101	conf->id, p->id, c->ictx && c->octx);
1102
1103	if (c->ictx && c->octx)
1104	{	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	{
1105	// send connect_info packets to both sides, in case one is	1263	// send connect_info packets to both sides, in case one is
1106	// behind a nat firewall (or both ;)	1264	// behind a nat firewall (or both ;)
1107	c->send_connect_info (conf->id, si, conf->protocols);	1265	c->send_connect_info (conf->id, si, conf->protocols);
1108	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 ();
1109	}	1270	}
1110	else	1271	else
1111	c->establish_connection ();	1272	slog (L_WARN,
		1273	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1274	p->id);
1112	}	1275	}
1113		1276
1114	break;	1277	break;
1115		1278
1116	case vpn_packet::PT_CONNECT_INFO:	1279	case vpn_packet::PT_CONNECT_INFO:
1117	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1280	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1118	{	1281	{
1119	connect_info_packet *p = (connect_info_packet *)pkt;	1282	connect_info_packet *p = (connect_info_packet *)pkt;
1120		1283
1121	if (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 ())
1122	{	1285	{
1123	connection *c = vpn->conns[p->id - 1];	1286	connection *c = vpn->conns[p->id - 1];
1124		1287
1125	c->conf->protocols = p->protocols;	1288	c->conf->protocols = p->protocols;
1126	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));
1127	p->si.upgrade_protocol (protocol, c->conf);	1290	p->si.upgrade_protocol (protocol, c->conf);
1128		1291
1129	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]",
1130	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);
1131		1300
1132	const sockinfo &dsi = forward_si (p->si);	1301	const sockinfo &dsi = forward_si (p->si);
1133		1302
1134	if (dsi.valid ())	1303	if (dsi.valid ())
1135	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);
1136	}	1309	}
		1310	else
		1311	slog (L_WARN,
		1312	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1313	p->id);
1137	}	1314	}
1138		1315
1139	break;	1316	break;
1140		1317
1141	default:	1318	default:
1142	send_reset (rsi);	1319	send_reset (rsi);
1143	break;	1320	break;
1144	}	1321	}
1145	}	1322	}
1146		1323
1147	void connection::keepalive_cb (time_watcher &w)	1324	inline void
		1325	connection::keepalive_cb (ev::timer &w, int revents)
1148	{	1326	{
1149	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)
1150	{	1332	{
1151	reset_connection ();	1333	reset_connection ("keepalive overdue");
1152	establish_connection ();	1334	establish_connection ();
1153	}	1335	}
1154	else if (NOW < last_activity + ::conf.keepalive)
1155	w.start (last_activity + ::conf.keepalive);
1156	else if (conf->connectmode != conf_node::C_ONDEMAND	1336	else if (conf->connectmode != conf_node::C_ONDEMAND
1157	|| THISNODE->connectmode != conf_node::C_ONDEMAND)	1337	|| THISNODE->connectmode != conf_node::C_ONDEMAND)
1158	{	1338	{
		1339	w.start (3);
1159	send_ping (si);	1340	send_ping (si);
1160	w.start (NOW + 5);
1161	}	1341	}
1162	else if (NOW < last_activity + ::conf.keepalive + 10)	1342	else if (when >= -10)
1163	// hold ondemand connections implicitly a few seconds longer	1343	// hold ondemand connections implicitly a few seconds longer
1164	// should delete octx, though, or something like that ;)	1344	// should delete octx, though, or something like that ;)
1165	w.start (last_activity + ::conf.keepalive + 10);	1345	w.start (when + 10);
1166	else	1346	else
1167	reset_connection ();	1347	reset_connection ("keepalive timeout");
1168	}	1348	}
1169		1349
		1350	void
1170	void connection::send_connect_request (int id)	1351	connection::send_connect_request (int id)
1171	{	1352	{
1172	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);
1173		1354
1174	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);
1175	p->hmac_set (octx);	1358	p->hmac_set (octx);
1176	send_vpn_packet (p, si);	1359	send_vpn_packet (p, si);
1177		1360
1178	delete p;	1361	delete p;
1179	}	1362	}
1180		1363
1181	void connection::script_node ()	1364	void
		1365	connection::script_init_env (const char *ext)
1182	{	1366	{
1183	vpn->script_if_up ();
1184
1185	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;
1186	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);
1187	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1383	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1188	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1384	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1189	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1385	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1190	}	1386	}
1191		1387
		1388	inline const char *
1192	const char *connection::script_node_up ()	1389	connection::script_node_up ()
1193	{	1390	{
1194	script_node ();	1391	script_init_connect_env ();
1195		1392
1196	putenv ("STATE=up");	1393	putenv ((char *)"STATE=up");
1197		1394
		1395	char *filename;
		1396	asprintf (&filename,
		1397	"%s/%s",
		1398	confbase,
1198	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1399	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1199	}
1200		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 *
1201	const char *connection::script_node_down ()	1421	connection::script_node_down ()
1202	{	1422	{
1203	script_node ();	1423	script_init_connect_env ();
1204		1424
1205	putenv ("STATE=down");	1425	putenv ((char *)"STATE=down");
1206		1426
1207	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1427	char *filename;
		1428	asprintf (&filename,
		1429	"%s/%s",
		1430	confbase,
		1431	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1432
		1433	return filename;
1208	}	1434	}
1209		1435
1210	connection::connection (struct vpn *vpn, conf_node *conf)	1436	connection::connection (struct vpn *vpn, conf_node *conf)
1211	: vpn(vpn), conf(conf)	1437	: vpn(vpn), conf(conf),
1212	, rekey (this, &connection::rekey_cb)
1213	, keepalive (this, &connection::keepalive_cb)
1214	, establish_connection (this, &connection::establish_connection_cb)
1215	#if ENABLE_DNS	1438	#if ENABLE_DNS
1216	, dns (0)	1439	dns (0),
1217	#endif	1440	#endif
		1441	data_queue(conf->max_ttl, conf->max_queue + 1),
		1442	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1218	{	1443	{
		1444	rekey .set<connection, &connection::rekey_cb > (this);
		1445	keepalive .set<connection, &connection::keepalive_cb > (this);
		1446	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1447
		1448	last_establish_attempt = 0.;
1219	octx = ictx = 0;	1449	octx = ictx = 0;
1220	retry_cnt = 0;
1221		1450
1222	if (!conf->protocols) // make sure some protocol is enabled	1451	connectmode = conf->connectmode;
1223	conf->protocols = PROT_UDPv4;
1224		1452
1225	connectmode = conf_node::C_ALWAYS; // initial setting	1453	// queue a dummy packet to force an initial connection attempt
		1454	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1455	vpn_queue.put (new net_packet);
		1456
1226	reset_connection ();	1457	reset_connection ("startup");
1227	}	1458	}
1228		1459
1229	connection::~connection ()	1460	connection::~connection ()
1230	{	1461	{
1231	shutdown ();	1462	shutdown ();
1232	}	1463	}
1233		1464
		1465	void
1234	void connection_init ()	1466	connection_init ()
1235	{	1467	{
1236	auth_rate_limiter.clear ();	1468	auth_rate_limiter.clear ();
1237	reset_rate_limiter.clear ();	1469	reset_rate_limiter.clear ();
1238	}	1470	}
1239		1471

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