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

Comparing gvpe/src/connection.C (file contents):
Revision 1.40 by pcg, Tue Mar 1 06:27:20 2005 UTC vs.
Revision 1.108 by root, Fri Oct 11 04:07:24 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013 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	#include <cassert>
23
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
		38	#include <openssl/opensslv.h>
26	#include <openssl/rand.h>	39	#include <openssl/rand.h>
27	#include <openssl/evp.h>	40	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	41	#include <openssl/rsa.h>
29	#include <openssl/err.h>	42	#include <openssl/err.h>
30		43
31	#include "gettext.h"	44	// openssl 0.9.8 compatibility
		45	#if OPENSSL_VERSION_NUMBER < 0x10100000
		46	#define require101(exp) exp
		47	#else
		48	#define require101(exp) equire (exp)
		49	#endif
32		50
33	#include "conf.h"	51	#include "conf.h"
34	#include "slog.h"	52	#include "slog.h"
35	#include "device.h"	53	#include "device.h"
36	#include "vpn.h"	54	#include "vpn.h"
37	#include "connection.h"	55	#include "connection.h"
		56	#include "hkdf.h"
38		57
39	#include "netcompat.h"	58	#include "netcompat.h"
40		59
41	#if !HAVE_RAND_PSEUDO_BYTES
42	# define RAND_pseudo_bytes RAND_bytes
43	#endif
44
45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	60	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		61	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
46		62
47	#define ULTRA_FAST 1	63	#define ULTRA_FAST 1
48	#define HLOG 15	64	#define HLOG 15
49	#include "lzf/lzf.h"	65	#include "lzf/lzf.h"
50	#include "lzf/lzf_c.c"	66	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	67	#include "lzf/lzf_d.c"
52		68
		69	//////////////////////////////////////////////////////////////////////////////
		70
		71	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		72	static ev::child rs_child_ev;
		73
		74	namespace
		75	{
		76	void // c++ requires external linkage here, apparently :(
		77	rs_child_cb (ev::child &w, int revents)
		78	{
		79	w.stop ();
		80
		81	if (rs_queue.empty ())
		82	return;
		83
		84	pid_t pid = run_script (*rs_queue.front ().first, false);
		85	if (pid)
		86	{
		87	w.set (pid);
		88	w.start ();
		89	}
		90	else
		91	slog (L_WARN, rs_queue.front ().second);
		92
		93	delete rs_queue.front ().first;
		94	rs_queue.pop ();
		95	}
		96	};
		97
		98	// despite the fancy name, this is quite a hack
		99	static void
		100	run_script_queued (run_script_cb cb, const char warnmsg)
		101	{
		102	rs_queue.push (std::make_pair (cb, warnmsg));
		103
		104	if (!rs_child_ev.is_active ())
		105	{
		106	rs_child_ev.set<rs_child_cb> ();
		107	rs_child_ev ();
		108	}
		109	}
		110
		111	//////////////////////////////////////////////////////////////////////////////
		112
53	struct crypto_ctx	113	struct crypto_ctx
54	{	114	{
55	EVP_CIPHER_CTX cctx;	115	EVP_CIPHER_CTX cctx;
56	HMAC_CTX hctx;	116	HMAC_CTX hctx;
57		117
58	crypto_ctx (const rsachallenge &challenge, int enc);	118	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	119	~crypto_ctx ();
60	};	120	};
61		121
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	122	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	123	{
		124	ecdh_key s;
		125
		126	curve25519_combine (a, b, s);
		127
		128	{
		129	u8 mac_key[MAC_KEYSIZE];
		130	static const unsigned char mac_info[] = "gvpe mac key";
		131
		132	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		133	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		134	kdf.extract (s, sizeof (s));
		135	kdf.extract_done (HKDF_PRF_HASH ());
		136	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		137
		138	HMAC_CTX_init (&hctx);
		139	require101 (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		140	}
		141
		142	{
		143	u8 cipher_key[CIPHER_KEYSIZE];
		144	static const unsigned char cipher_info[] = "gvpe cipher key";
		145
		146	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		147	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		148	kdf.extract (s, sizeof (s));
		149	kdf.extract_done (HKDF_PRF_HASH ());
		150	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		151
64	EVP_CIPHER_CTX_init (&cctx);	152	EVP_CIPHER_CTX_init (&cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	153	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	154	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	155	}
69		156
70	crypto_ctx::~crypto_ctx ()	157	crypto_ctx::~crypto_ctx ()
71	{	158	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	159	require (EVP_CIPHER_CTX_cleanup (&cctx));
73	HMAC_CTX_cleanup (&hctx);	160	HMAC_CTX_cleanup (&hctx);
74	}	161	}
75		162
		163	static inline void
		164	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		165	{
		166	if (RSA_public_encrypt (sizeof (auth.rsa),
		167	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		168	key, RSA_PKCS1_OAEP_PADDING) < 0)
		169	fatal ("RSA_public_encrypt error");
		170
		171	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		172	}
		173
		174	static inline bool
		175	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		176	{
		177	u8 rsa_decrypt[RSA_KEYLEN];
		178
		179	if (RSA_private_decrypt (sizeof (encr.rsa),
		180	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		181	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		182	return 0;
		183
		184	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		185	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		186
		187	return 1;
		188	}
		189
76	static void	190	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	191	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	192	{
79	EVP_MD_CTX ctx;	193	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		194	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	195	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	196	kdf.expand (mac, sizeof mac, auth.ecdh, sizeof (auth.ecdh)); // use challenge ecdh b as info
83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
86	EVP_MD_CTX_cleanup (&ctx);
87	}	197	}
88		198
89	struct rsa_entry {	199	void
90	tstamp expire;	200	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	201	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	202	if (auth_expire < ev_now ())
98
99	bool find (const rsaid &id, rsachallenge &chg)
100	{
101	for (iterator i = begin (); i != end (); ++i)
102	{
103	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
104	{
105	memcpy (&chg, &i->chg, sizeof chg);
106
107	erase (i);
108	return true;
109	}
110	}
111
112	if (cleaner.at < NOW)
113	cleaner.start (NOW + RSA_TTL);
114
115	return false;
116	}
117
118	void gen (rsaid &id, rsachallenge &chg)
119	{
120	rsa_entry e;
121
122	RAND_bytes ((unsigned char *)&id, sizeof id);
123	RAND_bytes ((unsigned char *)&chg, sizeof chg);
124
125	e.expire = NOW + RSA_TTL;
126	e.id = id;
127	memcpy (&e.chg, &chg, sizeof chg);
128
129	push_back (e);
130
131	if (cleaner.at < NOW)
132	cleaner.start (NOW + RSA_TTL);
133	}
134
135	rsa_cache ()
136	: cleaner (this, &rsa_cache::cleaner_cb)
137	{ }	203	{
		204	// request data
		205	rand_fill (snd_auth.rsa);
		206	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		207
139	} rsa_cache;	208	// eventual response data
140		209	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	210	}
145	w.start (NOW + RSA_TTL);
146		211
147	for (iterator i = begin (); i != end (); )	212	// every use prolongs the expiry
148	if (i->expire <= NOW)	213	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	214	}
154		215
155	//////////////////////////////////////////////////////////////////////////////	216	//////////////////////////////////////////////////////////////////////////////
156		217
157	void pkt_queue::put (net_packet *p)	218	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		219	: max_ttl (max_ttl), max_queue (max_queue)
158	{	220	{
159	if (queue[i])	221	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		222
165	queue[i] = p;
166
167	i = (i + 1) % QUEUEDEPTH;
168	}
169
170	net_packet *pkt_queue::get ()
171	{
172	net_packet *p = queue[j];
173
174	if (p)
175	{
176	queue[j] = 0;
177	j = (j + 1) % QUEUEDEPTH;
178	}
179
180	return p;
181	}
182
183	pkt_queue::pkt_queue ()
184	{
185	memset (queue, 0, sizeof (queue));
186	i = 0;	223	i = 0;
187	j = 0;	224	j = 0;
		225
		226	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	227	}
189		228
190	pkt_queue::~pkt_queue ()	229	pkt_queue::~pkt_queue ()
191	{	230	{
192	for (i = QUEUEDEPTH; --i > 0; )	231	while (net_packet *p = get ())
		232	delete p;
		233
193	delete queue[i];	234	delete [] queue;
194	}	235	}
195		236
		237	void
		238	pkt_queue::expire_cb (ev::timer &w, int revents)
		239	{
		240	ev_tstamp expire = ev_now () - max_ttl;
		241
		242	for (;;)
		243	{
		244	if (empty ())
		245	break;
		246
		247	double diff = queue[j].tstamp - expire;
		248
		249	if (diff >= 0.)
		250	{
		251	w.start (diff > 0.5 ? diff : 0.5);
		252	break;
		253	}
		254
		255	delete get ();
		256	}
		257	}
		258
		259	void
		260	pkt_queue::put (net_packet *p)
		261	{
		262	ev_tstamp now = ev_now ();
		263
		264	// start expiry timer
		265	if (empty ())
		266	expire.start (max_ttl);
		267
		268	int ni = i + 1 == max_queue ? 0 : i + 1;
		269
		270	if (ni == j)
		271	delete get ();
		272
		273	queue[i].pkt = p;
		274	queue[i].tstamp = now;
		275
		276	i = ni;
		277	}
		278
		279	net_packet *
		280	pkt_queue::get ()
		281	{
		282	if (empty ())
		283	return 0;
		284
		285	net_packet *p = queue[j].pkt;
		286	queue[j].pkt = 0;
		287
		288	j = j + 1 == max_queue ? 0 : j + 1;
		289
		290	return p;
		291	}
		292
196	struct net_rateinfo {	293	struct net_rateinfo
		294	{
197	u32 host;	295	u32 host;
198	double pcnt, diff;	296	double pcnt, diff;
199	tstamp last;	297	tstamp last;
200	};	298	};
201		299
211		309
212	bool can (const sockinfo &si) { return can((u32)si.host); }	310	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	311	bool can (u32 host);
214	};	312	};
215		313
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	314	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		315
		316	bool
218	bool net_rate_limiter::can (u32 host)	317	net_rate_limiter::can (u32 host)
219	{	318	{
220	iterator i;	319	iterator i;
221		320
222	for (i = begin (); i != end (); )	321	for (i = begin (); i != end (); )
223	if (i->host == host)	322	if (i->host == host)
224	break;	323	break;
225	else if (i->last < NOW - NRL_EXPIRE)	324	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	325	i = erase (i);
227	else	326	else
228	i++;	327	i++;
229		328
230	if (i == end ())	329	if (i == end ())
…		…
232	net_rateinfo ri;	331	net_rateinfo ri;
233		332
234	ri.host = host;	333	ri.host = host;
235	ri.pcnt = 1.;	334	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	335	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	336	ri.last = ev_now ();
238		337
239	push_front (ri);	338	push_front (ri);
240		339
241	return true;	340	return true;
242	}	341	}
…		…
244	{	343	{
245	net_rateinfo ri (*i);	344	net_rateinfo ri (*i);
246	erase (i);	345	erase (i);
247		346
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	347	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	348	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		349
251	ri.last = NOW;	350	ri.last = ev_now ();
252		351
253	double dif = ri.diff / ri.pcnt;	352	double dif = ri.diff / ri.pcnt;
254		353
255	bool send = dif > NRL_CUTOFF;	354	bool send = dif > NRL_CUTOFF;
256		355
…		…
268	}	367	}
269	}	368	}
270		369
271	/////////////////////////////////////////////////////////////////////////////	370	/////////////////////////////////////////////////////////////////////////////
272		371
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	372	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	373	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
276	{	374	{
277	unsigned int xlen;
278
279	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
280		376
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require101 (HMAC_Init_ex (hctx, 0, 0, 0, 0));
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require101 (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
283	len - sizeof (hmac_packet));	379	require101 (HMAC_Final (hctx, hmac_digest, 0));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	380	}
286		381
287	void	382	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	383	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	384	{
290	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		386	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	387	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	388	}
294		389
295	bool	390	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	391	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	392	{
298	hmac_gen (ctx);	393	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		394	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	395	return !memcmp (hmac, hmac_digest, HMACLENGTH);
301	}	396	}
302		397
		398	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	399	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	400	{
305	type = type_;	401	type = type_;
306		402
307	int src = THISNODE->id;	403	int src = THISNODE->id;
308		404
…		…
313		409
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	410	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)	411	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		412
317	struct vpndata_packet : vpn_packet	413	struct vpndata_packet : vpn_packet
		414	{
		415	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		416
		417	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		418	tap_packet unpack (connection conn, u32 &seqno);
		419
		420	private:
		421	const u32 data_hdr_size () const
318	{	422	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
320
321	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
322	tap_packet unpack (connection conn, u32 &seqno);
323	private:
324
325	const u32 data_hdr_size () const
326	{
327	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	423	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
328	}
329	};	424	}
		425	};
330		426
331	void	427	void
332	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	428	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
333	{	429	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	430	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
336	ptype type = PT_DATA_UNCOMPRESSED;	432	ptype type = PT_DATA_UNCOMPRESSED;
337		433
338	#if ENABLE_COMPRESSION	434	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	435	u8 cdata[MAX_MTU];
340		436
341	if (conn->features & ENABLE_COMPRESSION)	437	if (conn->features & FEATURE_COMPRESSION)
342	{	438	{
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	439	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
344		440
345	if (cl)	441	if (cl)
346	{	442	{
…		…
352	d[1] = cl;	448	d[1] = cl;
353	}	449	}
354	}	450	}
355	#endif	451	#endif
356		452
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	453	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
358		454
359	struct {	455	struct {
360	#if RAND_SIZE	456	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];	457	u8 rnd[RAND_SIZE];
362	#endif	458	#endif
363	u32 seqno;	459	u32 seqno;
364	} datahdr;	460	} datahdr;
365		461
366	datahdr.seqno = ntohl (seqno);	462	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE	463	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	464	// NB: a constant (per session) random prefix
		465	// is likely enough, but we don't take any chances.
		466	conn->oiv.get (datahdr.rnd, RAND_SIZE);
369	#endif	467	#endif
370		468
371	require (EVP_EncryptUpdate (cctx,	469	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	470	(unsigned char *) data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	471	(unsigned char *) &datahdr, DATAHDR));
…		…
395	int outl = 0, outl2;	493	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	494	tap_packet *p = new tap_packet;
397	u8 *d;	495	u8 *d;
398	u32 l = len - data_hdr_size ();	496	u32 l = len - data_hdr_size ();
399		497
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	498	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
401		499
402	#if ENABLE_COMPRESSION	500	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	501	u8 cdata[MAX_MTU];
404		502
405	if (type == PT_DATA_COMPRESSED)	503	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	504	d = cdata;
407	else	505	else
408	#endif	506	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	507	d = &(*p)[6 + 6] - DATAHDR;
410		508
411	/* this overwrites part of the src mac, but we fix that later */	509	// we play do evil games with the struct layout atm.
		510	// pending better solutions, we at least do some verification.
		511	// this is fine, as we left ISO territory long ago.
		512	require (DATAHDR <= 16);
		513	require ((u8 )(&p->len + 1) == &(p)[0]);
		514
		515	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	516	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	517	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	518	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	519	outl += outl2;
416		520
…		…
447	}	551	}
448	};	552	};
449		553
450	struct config_packet : vpn_packet	554	struct config_packet : vpn_packet
451	{	555	{
452	// actually, hmaclen cannot be checked because the hmac	556	u8 serial[SERIAL_SIZE];
453	// field comes before this data, so peers with other
454	// hmacs simply will not work.
455	u8 prot_major, prot_minor, randsize, hmaclen;	557	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	558	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	559	u32 cipher_nid, mac_nid, auth_nid;
458		560
459	void setup (ptype type, int dst);	561	void setup (ptype type, int dst);
460	bool chk_config () const;	562	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		563
462	static u8 get_features ()	564	static u8 get_features ()
463	{	565	{
464	u8 f = 0;	566	u8 f = 0;
465	#if ENABLE_COMPRESSION	567	#if ENABLE_COMPRESSION
466	f \|= FEATURE_COMPRESSION;	568	f \|= FEATURE_COMPRESSION;
467	#endif	569	#endif
468	#if ENABLE_ROHC	570	#if ENABLE_ROHC
469	f \|= FEATURE_ROHC;	571	f \|= FEATURE_ROHC;
470	#endif	572	#endif
		573	#if ENABLE_BRIDGING
		574	f \|= FEATURE_BRIDGING;
		575	#endif
471	return f;	576	return f;
472	}	577	}
473	};	578	};
474		579
		580	void
475	void config_packet::setup (ptype type, int dst)	581	config_packet::setup (ptype type, int dst)
476	{	582	{
477	prot_major = PROTOCOL_MAJOR;	583	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	584	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	585	randsize = RAND_SIZE;
480	hmaclen = HMACLENGTH;	586	flags = 0;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	587	features = get_features ();
484		588
		589	strncpy ((char *)serial, conf.serial, sizeof (serial));
		590
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	591	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	592	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		593	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		594
489	len = sizeof (*this) - sizeof (net_packet);	595	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	596	set_hdr (type, dst);
491	}	597	}
492		598
493	bool config_packet::chk_config () const	599	bool
		600	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	601	{
495	if (prot_major != PROTOCOL_MAJOR)	602	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	603	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		604	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
497	else if (randsize != RAND_SIZE)	605	else if (randsize != RAND_SIZE)
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	606	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
499	else if (hmaclen != HMACLENGTH)	607	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
501	#if 0 // this implementation should handle all flag settings
502	else if (flags != curflags ())
503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
504	#endif
505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	608	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
508	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	609	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	610	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	611	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
512	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	612	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		613	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		614	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		615	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		616	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	617	else
		618	{
		619	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		620
		621	if (cmp > 0)
		622	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		623	conf->nodename, (const char *)rsi);
		624	else if (cmp == 0)
514	return true;	625	return true;
		626	}
515		627
516	return false;	628	return false;
517	}	629	}
518		630
519	struct auth_req_packet : config_packet	631	struct auth_req_packet : config_packet // UNPROTECTED
520	{	632	{
521	char magic[8];	633	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	634	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	635	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	636	u8 pad2, pad3;
525	rsaid id;	637	auth_encr encr;
526	rsaencrdata encr;
527		638
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	639	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	640	{
530	config_packet::setup (PT_AUTH_REQ, dst);	641	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	642	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	643	initiate = !!initiate_;
533	protocols = protocols_;	644	protocols = protocols_;
534		645
535	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
536	}	647	}
537	};	648	};
538		649
539	struct auth_res_packet : config_packet	650	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	651	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	652	auth_response response;
545		653
546	auth_res_packet (int dst)	654	auth_res_packet (int dst)
547	{	655	{
548	config_packet::setup (PT_AUTH_RES, dst);	656	set_hdr (PT_AUTH_RES, dst);
549		657
550	len = sizeof (*this) - sizeof (net_packet);	658	len = sizeof (*this) - sizeof (net_packet);
551	}	659	}
552	};	660	};
553		661
…		…
583	};	691	};
584		692
585	/////////////////////////////////////////////////////////////////////////////	693	/////////////////////////////////////////////////////////////////////////////
586		694
587	void	695	void
588	connection::connection_established ()	696	connection::connection_established (const sockinfo &rsi)
589	{	697	{
590	if (ictx && octx)	698	if (!have_snd_auth \|\| !have_rcv_auth)
		699	return;
		700
		701	si = rsi;
		702	protocol = rsi.prot;
		703
		704	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		705	conf->nodename, (const char *)rsi,
		706	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		707	PROTOCOL_MAJOR, prot_minor);
		708
		709	if (::conf.script_node_up)
		710	{
		711	run_script_cb *cb = new run_script_cb;
		712	cb->set<connection, &connection::script_node_up> (this);
		713	run_script_queued (cb, _("node-up command execution failed, continuing."));
591	{	714	}
592	connectmode = conf->connectmode;	715
		716	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		717	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
593		718
		719	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		720	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		721
		722	oiv.reset ();
		723
594	// make sure rekeying timeouts are slightly asymmetric	724	// make sure rekeying timeouts are slightly asymmetric
595	rekey.start (NOW + ::conf.rekey	725	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
596	+ (conf->id > THISNODE->id ? 10 : 0));	726	rekey.start (rekey_interval, rekey_interval);
		727
		728	hmac_error = 0.;
		729
597	keepalive.start (NOW + ::conf.keepalive);	730	keepalive.start (::conf.keepalive);
598		731
599	// send queued packets	732	// send queued packets
600	if (ictx && octx)
601	{
602	while (tap_packet p = (tap_packet )data_queue.get ())	733	while (tap_packet p = (tap_packet )data_queue.get ())
603	{	734	{
604	send_data_packet (p);	735	if (p->len) send_data_packet (p);
605	delete p;	736	delete p;
606	}	737	}
607		738
608	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	739	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
609	{	740	{
610	send_vpn_packet (p, si, IPTOS_RELIABILITY);	741	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
611	delete p;	742	delete p;
612	}
613	}
614	}	743	}
		744
		745	vpn->connection_established (this);
		746	}
		747
		748	void
		749	connection::reset_si ()
		750	{
		751	if (vpn->can_direct (THISNODE, conf))
		752	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
615	else	753	else
616	{	754	{
617	retry_cnt = 0;	755	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
618	establish_connection.start (NOW + 5);	756	protocol = 0;
619	keepalive.stop ();
620	rekey.stop ();
621	}	757	}
622	}
623
624	void
625	connection::reset_si ()
626	{
627	protocol = best_protocol (THISNODE->protocols & conf->protocols);
628
629	// mask out protocols we cannot establish
630	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
631	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
632	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
633		758
634	si.set (conf, protocol);	759	si.set (conf, protocol);
635	}	760	}
636		761
637	// ensure sockinfo is valid, forward if necessary	762	// ensure sockinfo is valid, forward if necessary
638	const sockinfo &	763	const sockinfo &
639	connection::forward_si (const sockinfo &si) const	764	connection::forward_si (const sockinfo &si) const
640	{	765	{
641	if (!si.valid ())	766	if (!si.valid ())
642	{	767	{
643	connection *r = vpn->find_router ();	768	connection *r = vpn->find_router_for (this);
644		769
645	if (r)	770	if (r)
646	{	771	{
647	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	772	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
648	conf->nodename, r->conf->nodename);	773	conf->nodename, r->conf->nodename);
649	return r->si;	774	return r->si;
650	}	775	}
651	else	776	else
652	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	777	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
653	conf->nodename);	778	conf->nodename);
654	}	779	}
655		780
656	return si;	781	return si;
657	}	782	}
658		783
659	void	784	void
660	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	785	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
661	{	786	{
662	bool ok;	787	if (!vpn->send_vpn_packet (pkt, si, tos))
663		788	reset_connection ("packet send error");
664	switch (si.prot)
665	{
666	case PROT_IPv4:
667	ok = vpn->send_ipv4_packet (pkt, si, tos); break;
668	case PROT_UDPv4:
669	ok = vpn->send_udpv4_packet (pkt, si, tos); break;
670	#if ENABLE_TCP
671	case PROT_TCPv4:
672	ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
673	#endif
674	#if ENABLE_ICMP
675	case PROT_ICMPv4:
676	ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
677	#endif
678	#if ENABLE_DNS
679	case PROT_DNSv4:
680	ok = send_dnsv4_packet (pkt, si, tos); break;
681	#endif
682
683	default:
684	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
685	ok = false;
686	}
687
688	if (!ok)
689	reset_connection ();
690	}	789	}
691		790
692	void	791	void
693	connection::send_ping (const sockinfo &si, u8 pong)	792	connection::send_ping (const sockinfo &si, u8 pong)
694	{	793	{
695	ping_packet *pkt = new ping_packet;	794	ping_packet *pkt = new ping_packet;
696		795
697	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	796	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		797
		798	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
698	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	799	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
699		800
700	delete pkt;	801	delete pkt;
701	}	802	}
702		803
…		…
717	void	818	void
718	connection::send_auth_request (const sockinfo &si, bool initiate)	819	connection::send_auth_request (const sockinfo &si, bool initiate)
719	{	820	{
720	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	821	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
721		822
722	rsachallenge chg;	823	generate_auth_data ();
723	rsa_cache.gen (pkt->id, chg);
724	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	824	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
725		825
726	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	826	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
727
728	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
729		828
730	delete pkt;	829	delete pkt;
731	}	830	}
732		831
733	void	832	void
734	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	833	connection::send_auth_response (const sockinfo &si)
735	{	834	{
736	auth_res_packet *pkt = new auth_res_packet (conf->id);	835	auth_res_packet *pkt = new auth_res_packet (conf->id);
737		836
738	pkt->id = id;	837	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		838	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
739		839
740	rsa_hash (id, chg, pkt->response);
741
742	pkt->hmac_set (octx);
743
744	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	840	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
745
746	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	841	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
747		842
748	delete pkt;	843	delete pkt;
749	}	844	}
750		845
751	void	846	void
752	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	847	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
753	{	848	{
754	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	849	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
755	conf->id, rid, (const char *)rsi);	850	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		851	conf->protocols);
756		852
757	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	853	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
758		854
759	r->hmac_set (octx);	855	r->hmac_set (octx);
760	send_vpn_packet (r, si);	856	send_vpn_packet (r, si);
761		857
762	delete r;	858	delete r;
763	}	859	}
764		860
765	void	861	inline void
766	connection::establish_connection_cb (time_watcher &w)	862	connection::establish_connection_cb (ev::timer &w, int revents)
767	{	863	{
768	if (!ictx	864	if (!(ictx && octx)
769	&& conf != THISNODE	865	&& conf != THISNODE
770	&& connectmode != conf_node::C_NEVER	866	&& connectmode != conf_node::C_NEVER
771	&& connectmode != conf_node::C_DISABLED	867	&& connectmode != conf_node::C_DISABLED
772	&& NOW > w.at)	868	&& !w.is_active ())
773	{	869	{
774	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	870	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
775		871	// and stop trying. should probably be handled by a per-connection expire handler.
776	if (retry_int < conf->max_retry)	872	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		873	{
		874	reset_connection ("no demand");
777	retry_cnt++;	875	return;
778	else	876	}
779	retry_int = conf->max_retry;
780		877
781	w.start (NOW + retry_int);	878	last_establish_attempt = ev_now ();
		879
		880	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		881	? (retry_cnt & 3) + 1
		882	: 1 << (retry_cnt >> 2));
782		883
783	reset_si ();	884	reset_si ();
784		885
785	if (si.prot && !si.host)	886	bool slow = si.prot & PROT_SLOW;
		887
		888	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		889	{
		890	/TODO/ /* start the timer so we don't recurse endlessly */
		891	w.start (1);
786	vpn->send_connect_request (conf->id);	892	vpn->send_connect_request (this);
		893	}
787	else	894	else
788	{	895	{
		896	if (si.valid ())
		897	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		898	conf->nodename, (const char *)si);
		899
789	const sockinfo &dsi = forward_si (si);	900	const sockinfo &dsi = forward_si (si);
		901
		902	slow = slow \|\| (dsi.prot & PROT_SLOW);
790		903
791	if (dsi.valid () && auth_rate_limiter.can (dsi))	904	if (dsi.valid () && auth_rate_limiter.can (dsi))
792	{	905	{
793	if (retry_cnt < 4)	906	if (retry_cnt < 4)
794	send_auth_request (dsi, true);	907	send_auth_request (dsi, true);
795	else	908	else
796	send_ping (dsi, 0);	909	send_ping (dsi, 0);
797	}	910	}
798	}	911	}
799	}
800	}
801		912
		913	retry_int *= slow ? 8. : 0.9;
		914
		915	if (retry_int < conf->max_retry)
		916	retry_cnt++;
		917	else
		918	retry_int = conf->max_retry;
		919
		920	w.start (retry_int);
		921	}
		922	}
		923
802	void	924	void
803	connection::reset_connection ()	925	connection::reset_connection (const char *reason)
804	{	926	{
805	if (ictx && octx)	927	if (ictx && octx)
806	{	928	{
807	slog (L_INFO, _("%s(%s): connection lost"),	929	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	930	conf->nodename, (const char *)si, reason);
809		931
810	if (::conf.script_node_down)	932	if (::conf.script_node_down)
811	run_script (run_script_cb (this, &connection::script_node_down), false);	933	{
		934	run_script_cb *cb = new run_script_cb;
		935	cb->set<connection, &connection::script_node_down> (this);
		936	run_script_queued (cb, _("node-down command execution failed, continuing."));
		937	}
812	}	938	}
813		939
814	delete ictx; ictx = 0;	940	delete ictx; ictx = 0;
815	delete octx; octx = 0;	941	delete octx; octx = 0;
816		942
817	si.host = 0;	943	si.host = 0;
818		944
		945	have_snd_auth = false;
		946	have_rcv_auth = false;
		947	auth_expire = 0.;
		948
819	last_activity = 0;	949	last_activity = 0.;
		950	//last_si_change = 0.;
820	retry_cnt = 0;	951	retry_cnt = 0;
821		952
822	rekey.stop ();	953	rekey.stop ();
823	keepalive.stop ();	954	keepalive.stop ();
824	establish_connection.stop ();	955	establish_connection.stop ();
…		…
828	connection::shutdown ()	959	connection::shutdown ()
829	{	960	{
830	if (ictx && octx)	961	if (ictx && octx)
831	send_reset (si);	962	send_reset (si);
832		963
833	reset_connection ();	964	reset_connection ("shutdown");
834	}	965	}
835		966
836	void	967	// poor-man's rekeying
837	connection::rekey_cb (time_watcher &w)	968	inline void
		969	connection::rekey_cb (ev::timer &w, int revents)
838	{	970	{
839	reset_connection ();	971	reset_connection ("rekeying");
840	establish_connection ();	972	establish_connection ();
841	}	973	}
842		974
843	void	975	void
844	connection::send_data_packet (tap_packet *pkt)	976	connection::send_data_packet (tap_packet *pkt)
…		…
858	if (oseqno > MAX_SEQNO)	990	if (oseqno > MAX_SEQNO)
859	rekey ();	991	rekey ();
860	}	992	}
861		993
862	void	994	void
		995	connection::post_inject_queue ()
		996	{
		997	// force a connection every now and when when packets are sent (max 1/s)
		998	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		999	establish_connection.stop ();
		1000
		1001	establish_connection ();
		1002	}
		1003
		1004	void
863	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	1005	connection::inject_data_packet (tap_packet *pkt)
864	{	1006	{
865	if (ictx && octx)	1007	if (ictx && octx)
866	send_data_packet (pkt);	1008	send_data_packet (pkt);
867	else	1009	else
868	{	1010	{
869	if (!broadcast)//DDDD
870	data_queue.put (new tap_packet (*pkt));	1011	data_queue.put (new tap_packet (*pkt));
871		1012	post_inject_queue ();
872	establish_connection ();
873	}	1013	}
874	}	1014	}
875		1015
		1016	void
876	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1017	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
877	{	1018	{
878	if (ictx && octx)	1019	if (ictx && octx)
879	send_vpn_packet (pkt, si, tos);	1020	send_vpn_packet (pkt, si, tos);
880	else	1021	else
881	{	1022	{
882	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1023	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
883		1024	post_inject_queue ();
884	establish_connection ();
885	}	1025	}
886	}	1026	}
887		1027
888	void	1028	void
889	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1029	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
890	{	1030	{
891	last_activity = NOW;	1031	last_activity = ev_now ();
892		1032
893	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1033	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
894	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1034	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1035
		1036	if (connectmode == conf_node::C_DISABLED)
		1037	return;
895		1038
896	switch (pkt->typ ())	1039	switch (pkt->typ ())
897	{	1040	{
898	case vpn_packet::PT_PING:	1041	case vpn_packet::PT_PING:
		1042	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1043
899	// we send pings instead of auth packets after some retries,	1044	// we send pings instead of auth packets after some retries,
900	// so reset the retry counter and establish a connection	1045	// so reset the retry counter and establish a connection
901	// when we receive a ping.	1046	// when we receive a ping.
902	if (!ictx)	1047	if (!ictx)
903	{	1048	{
904	if (auth_rate_limiter.can (rsi))	1049	if (auth_rate_limiter.can (rsi))
905	send_auth_request (rsi, true);	1050	send_auth_request (rsi, true);
906	}	1051	}
907	else	1052	else
		1053	// we would love to change the socket address here, but ping's aren't
		1054	// authenticated, so we best ignore it.
908	send_ping (rsi, 1); // pong	1055	send_ping (rsi, 1); // pong
909		1056
910	break;	1057	break;
911		1058
912	case vpn_packet::PT_PONG:	1059	case vpn_packet::PT_PONG:
		1060	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1061
		1062	// a PONG might mean that the other side doesn't really know
		1063	// about our desire for communication.
		1064	establish_connection ();
913	break;	1065	break;
914		1066
915	case vpn_packet::PT_RESET:	1067	case vpn_packet::PT_RESET:
		1068	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1069
		1070	if (ictx && octx)
916	{	1071	{
917	reset_connection ();	1072	reset_connection ("remote reset");
918		1073
919	config_packet p = (config_packet ) pkt;	1074	config_packet p = (config_packet ) pkt;
920		1075
921	if (!p->chk_config ())	1076	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
922	{
923	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
924	conf->nodename, (const char *)rsi);
925	connectmode = conf_node::C_DISABLED;
926	}
927	else if (connectmode == conf_node::C_ALWAYS)
928	establish_connection ();	1077	establish_connection ();
929	}	1078	}
		1079
930	break;	1080	break;
931		1081
932	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
933	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
934	{	1084	{
935	auth_req_packet p = (auth_req_packet ) pkt;	1085	auth_req_packet p = (auth_req_packet )pkt;
936		1086
937	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1087	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1088	conf->nodename, p->initiate ? "initiate" : "reply",
		1089	p->protocols, p->features);
938		1090
939	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1091	if (memcmp (p->magic, MAGIC, 8))
		1092	{
		1093	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1094	conf->nodename, (const char *)rsi);
		1095	}
		1096	else if (p->chk_config (conf, rsi))
940	{	1097	{
941	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
942	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1099	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
943	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
944	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
945		1102
946	if (p->initiate)	1103	if (p->initiate)
		1104	{
947	send_auth_request (rsi, false);	1105	send_auth_request (rsi, false);
948		1106
949	rsachallenge k;	1107	if (ictx && octx)
		1108	reset_connection ("reconnect");
		1109	}
950		1110
		1111	auth_data auth;
		1112
951	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1113	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
952	{	1114	{
953	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1115	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
954	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1116	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
955	break;
956	}	1117	}
957	else	1118	else
958	{	1119	{
959	delete octx;	1120	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
960		1121
961	octx = new crypto_ctx (k, 1);	1122	rcv_auth = auth;
962	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1123	have_rcv_auth = true;
963		1124
964	// compatibility code, remove when no longer required	1125	send_auth_response (rsi);
965	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
966		1126
		1127	if (chg)
		1128	{
967	conf->protocols = p->protocols;	1129	conf->protocols = p->protocols;
968	features = p->features & config_packet::get_features ();	1130	features = p->features & config_packet::get_features ();
969		1131
970	send_auth_response (rsi, p->id, k);
971
972	connection_established ();	1132	connection_established (rsi);
973
974	break;	1133	}
975	}	1134	}
		1135
		1136	break;
976	}	1137	}
977	else
978	slog (L_WARN, _("%s(%s): protocol mismatch"),
979	conf->nodename, (const char *)rsi);
980		1138
981	send_reset (rsi);	1139	send_reset (rsi);
982	}	1140	}
983		1141
984	break;	1142	break;
985		1143
986	case vpn_packet::PT_AUTH_RES:	1144	case vpn_packet::PT_AUTH_RES:
987	{	1145	{
988	auth_res_packet p = (auth_res_packet ) pkt;	1146	auth_res_packet p = (auth_res_packet )pkt;
989		1147
990	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1148	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
991		1149
992	if (p->chk_config ())	1150	auth_mac local_mac;
		1151	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1152
		1153	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
993	{	1154	{
994	if (p->prot_minor != PROTOCOL_MINOR)
995	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
996	conf->nodename, (const char *)rsi,
997	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
998
999	rsachallenge chg;
1000
1001	if (!rsa_cache.find (p->id, chg))
1002	{
1003	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1155	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1004	conf->nodename, (const char *)rsi);	1156	conf->nodename, (const char *)rsi);
1005	break;
1006	}	1157	}
1007	else	1158	else if (!have_snd_auth)
1008	{	1159	{
1009	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1160	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1010		1161
1011	if (!p->hmac_chk (cctx))	1162	have_snd_auth = true;
1012	{
1013	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1014	"could be an attack, or just corruption or a synchronization error"),
1015	conf->nodename, (const char *)rsi);
1016	break;
1017	}
1018	else
1019	{
1020	rsaresponse h;
1021
1022	rsa_hash (p->id, chg, h);
1023
1024	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
1025	{
1026	prot_minor = p->prot_minor;
1027
1028	delete ictx; ictx = cctx;
1029
1030	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1031
1032	si = rsi;
1033	protocol = rsi.prot;
1034
1035	connection_established ();	1163	connection_established (rsi);
1036
1037	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1038	conf->nodename, (const char *)rsi,
1039	p->prot_major, p->prot_minor);
1040
1041	if (::conf.script_node_up)
1042	run_script (run_script_cb (this, &connection::script_node_up), false);
1043
1044	break;
1045	}
1046	else
1047	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1048	conf->nodename, (const char *)rsi);
1049	}
1050
1051	delete cctx;
1052	}
1053	}	1164	}
1054	}	1165	}
1055
1056	send_reset (rsi);
1057	break;	1166	break;
1058		1167
1059	case vpn_packet::PT_DATA_COMPRESSED:	1168	case vpn_packet::PT_DATA_COMPRESSED:
1060	#if !ENABLE_COMPRESSION	1169	#if !ENABLE_COMPRESSION
1061	send_reset (rsi);	1170	send_reset (rsi);
…		…
1067	if (ictx && octx)	1176	if (ictx && octx)
1068	{	1177	{
1069	vpndata_packet p = (vpndata_packet )pkt;	1178	vpndata_packet p = (vpndata_packet )pkt;
1070		1179
1071	if (!p->hmac_chk (ictx))	1180	if (!p->hmac_chk (ictx))
		1181	{
		1182	// rekeying often creates temporary hmac auth floods
		1183	// we assume they don't take longer than a few seconds normally,
		1184	// and suppress messages and resets during that time.
		1185	//TODO: should be done per source address
		1186	if (!hmac_error)
		1187	{
		1188	hmac_error = ev_now () + 3;
		1189	break;
		1190	}
		1191	else if (hmac_error >= ev_now ())
		1192	break; // silently suppress
		1193	else
		1194	{
1072	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1195	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1073	"could be an attack, or just corruption or a synchronization error"),	1196	"could be an attack, or just corruption or a synchronization error."),
1074	conf->nodename, (const char *)rsi);	1197	conf->nodename, (const char *)rsi);
		1198	// reset
		1199	}
		1200	}
1075	else	1201	else
1076	{	1202	{
1077	u32 seqno;	1203	u32 seqno;
1078	tap_packet *d = p->unpack (this, seqno);	1204	tap_packet *d = p->unpack (this, seqno);
		1205	int seqclass = iseqno.seqno_classify (seqno);
1079		1206
1080	if (iseqno.recv_ok (seqno))	1207	hmac_error = 0;
		1208
		1209	if (seqclass == 0) // ok
1081	{	1210	{
1082	vpn->tap->send (d);	1211	vpn->tap->send (d);
1083		1212
1084	if (si != rsi)	1213	if (si != rsi)
1085	{	1214	{
1086	// fast re-sync on connection changes, useful especially for tcp/ip	1215	// fast re-sync on source address changes, useful especially for tcp/ip
		1216	//if (last_si_change < ev_now () + 5.)
1087	si = rsi;	1217	// {
1088
1089	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1218	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1090	conf->nodename, (const char )si, (const char )rsi);	1219	conf->nodename, (const char )si, (const char )rsi);
		1220
		1221	si = rsi;
		1222
		1223	if (::conf.script_node_change)
		1224	{
		1225	run_script_cb *cb = new run_script_cb;
		1226	cb->set<connection, &connection::script_node_change> (this);
		1227	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1228	}
		1229
		1230	// }
		1231	//else
		1232	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1233	// conf->nodename, (const char )si, (const char )rsi);
1091	}	1234	}
		1235	}
		1236	else if (seqclass == 1) // far history
		1237	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1238	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1239	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1240	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1241	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1242	else if (seqclass == 3) // reset
		1243	{
		1244	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1245	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1246	send_reset (rsi);
1092	}	1247	}
1093		1248
1094	delete d;	1249	delete d;
1095	break;	1250	break;
1096	}	1251	}
…		…
1100	break;	1255	break;
1101		1256
1102	case vpn_packet::PT_CONNECT_REQ:	1257	case vpn_packet::PT_CONNECT_REQ:
1103	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1258	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1104	{	1259	{
1105	connect_req_packet p = (connect_req_packet ) pkt;	1260	connect_req_packet p = (connect_req_packet )pkt;
1106		1261
1107	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1262	if (p->id > 0 && p->id <= vpn->conns.size ())
1108	connection *c = vpn->conns[p->id - 1];
1109	conf->protocols = p->protocols;
1110
1111	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1112	conf->id, p->id, c->ictx && c->octx);
1113
1114	if (c->ictx && c->octx)
1115	{	1263	{
		1264	connection *c = vpn->conns[p->id - 1];
		1265	conf->protocols = p->protocols;
		1266
		1267	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1268	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1269	p->protocols,
		1270	c->ictx && c->octx);
		1271
		1272	if (c->ictx && c->octx)
		1273	{
1116	// send connect_info packets to both sides, in case one is	1274	// send connect_info packets to both sides, in case one is
1117	// behind a nat firewall (or both ;)	1275	// behind a nat firewall (or both ;)
1118	c->send_connect_info (conf->id, si, conf->protocols);	1276	c->send_connect_info (conf->id, si, conf->protocols);
1119	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1277	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1278	}
		1279	else
		1280	c->establish_connection ();
1120	}	1281	}
1121	else	1282	else
1122	c->establish_connection ();	1283	slog (L_WARN,
		1284	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1285	p->id);
1123	}	1286	}
1124		1287
1125	break;	1288	break;
1126		1289
1127	case vpn_packet::PT_CONNECT_INFO:	1290	case vpn_packet::PT_CONNECT_INFO:
1128	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1291	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1129	{	1292	{
1130	connect_info_packet p = (connect_info_packet )pkt;	1293	connect_info_packet p = (connect_info_packet )pkt;
1131		1294
1132	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1295	if (p->id > 0 && p->id <= vpn->conns.size ())
1133	{	1296	{
1134	connection *c = vpn->conns[p->id - 1];	1297	connection *c = vpn->conns[p->id - 1];
1135		1298
1136	c->conf->protocols = p->protocols;	1299	c->conf->protocols = p->protocols;
1137	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1300	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1138	p->si.upgrade_protocol (protocol, c->conf);	1301	p->si.upgrade_protocol (protocol, c->conf);
1139		1302
1140	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1303	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1141	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1304	conf->nodename,
		1305	vpn->conns[p->id - 1]->conf->nodename,
		1306	(const char *)p->si,
		1307	p->protocols,
		1308	protocol,
		1309	p->si.supported_protocols (c->conf),
		1310	!c->ictx && !c->octx);
1142		1311
1143	const sockinfo &dsi = forward_si (p->si);	1312	const sockinfo &dsi = forward_si (p->si);
1144		1313
1145	if (dsi.valid ())	1314	if (dsi.valid ())
1146	c->send_auth_request (dsi, true);	1315	c->send_auth_request (dsi, true);
		1316	else
		1317	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1318	vpn->conns[p->id - 1]->conf->nodename,
		1319	(const char *)p->si);
1147	}	1320	}
		1321	else
		1322	slog (L_WARN,
		1323	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1324	p->id);
1148	}	1325	}
1149		1326
1150	break;	1327	break;
1151		1328
1152	default:	1329	default:
1153	send_reset (rsi);	1330	send_reset (rsi);
1154	break;	1331	break;
1155	}	1332	}
1156	}	1333	}
1157		1334
1158	void connection::keepalive_cb (time_watcher &w)	1335	inline void
		1336	connection::keepalive_cb (ev::timer &w, int revents)
1159	{	1337	{
1160	if (NOW >= last_activity + ::conf.keepalive + 30)	1338	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1339
		1340	if (when >= 0)
		1341	w.start (when);
		1342	else if (when < -15)
1161	{	1343	{
1162	reset_connection ();	1344	reset_connection ("keepalive overdue");
1163	establish_connection ();	1345	establish_connection ();
1164	}	1346	}
1165	else if (NOW < last_activity + ::conf.keepalive)
1166	w.start (last_activity + ::conf.keepalive);
1167	else if (conf->connectmode != conf_node::C_ONDEMAND	1347	else if (conf->connectmode != conf_node::C_ONDEMAND
1168	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1348	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1169	{	1349	{
		1350	w.start (3);
1170	send_ping (si);	1351	send_ping (si);
1171	w.start (NOW + 5);
1172	}	1352	}
1173	else if (NOW < last_activity + ::conf.keepalive + 10)	1353	else if (when >= -10)
1174	// hold ondemand connections implicitly a few seconds longer	1354	// hold ondemand connections implicitly a few seconds longer
1175	// should delete octx, though, or something like that ;)	1355	// should delete octx, though, or something like that ;)
1176	w.start (last_activity + ::conf.keepalive + 10);	1356	w.start (when + 10);
1177	else	1357	else
1178	reset_connection ();	1358	reset_connection ("keepalive timeout");
1179	}	1359	}
1180		1360
		1361	void
1181	void connection::send_connect_request (int id)	1362	connection::send_connect_request (int id)
1182	{	1363	{
1183	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1364	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1184		1365
1185	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1366	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1367	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1368	THISNODE->protocols);
1186	p->hmac_set (octx);	1369	p->hmac_set (octx);
1187	send_vpn_packet (p, si);	1370	send_vpn_packet (p, si);
1188		1371
1189	delete p;	1372	delete p;
1190	}	1373	}
1191		1374
1192	void connection::script_node ()	1375	void
		1376	connection::script_init_env (const char *ext)
1193	{	1377	{
1194	vpn->script_if_up ();
1195
1196	char *env;	1378	char *env;
		1379	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1380	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1381	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1382	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1383	conf->id & 0xff); putenv (env);
		1384	}
		1385
		1386	void
		1387	connection::script_init_connect_env ()
		1388	{
		1389	vpn->script_init_env ();
		1390
		1391	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1392	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1393	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1394	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1395	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1396	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1397	}
1202		1398
		1399	inline const char *
1203	const char *connection::script_node_up ()	1400	connection::script_node_up ()
1204	{	1401	{
1205	script_node ();	1402	script_init_connect_env ();
1206		1403
1207	putenv ("STATE=up");	1404	putenv ((char *)"STATE=up");
1208		1405
		1406	char *filename;
		1407	asprintf (&filename,
		1408	"%s/%s",
		1409	confbase,
1209	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1410	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1210	}
1211		1411
		1412	return filename;
		1413	}
		1414
		1415	inline const char *
		1416	connection::script_node_change ()
		1417	{
		1418	script_init_connect_env ();
		1419
		1420	putenv ((char *)"STATE=change");
		1421
		1422	char *filename;
		1423	asprintf (&filename,
		1424	"%s/%s",
		1425	confbase,
		1426	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1427
		1428	return filename;
		1429	}
		1430
		1431	inline const char *
1212	const char *connection::script_node_down ()	1432	connection::script_node_down ()
1213	{	1433	{
1214	script_node ();	1434	script_init_connect_env ();
1215		1435
1216	putenv ("STATE=down");	1436	putenv ((char *)"STATE=down");
1217		1437
1218	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1438	char *filename;
		1439	asprintf (&filename,
		1440	"%s/%s",
		1441	confbase,
		1442	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1443
		1444	return filename;
1219	}	1445	}
1220		1446
1221	connection::connection (struct vpn vpn, conf_node conf)	1447	connection::connection (struct vpn vpn, conf_node conf)
1222	: vpn(vpn), conf(conf)	1448	: vpn(vpn), conf(conf),
1223	, rekey (this, &connection::rekey_cb)
1224	, keepalive (this, &connection::keepalive_cb)
1225	, establish_connection (this, &connection::establish_connection_cb)
1226	#if ENABLE_DNS	1449	#if ENABLE_DNS
1227	, dnsv4_tw (this, &connection::dnsv4_cb)	1450	dns (0),
1228	#endif	1451	#endif
		1452	data_queue(conf->max_ttl, conf->max_queue + 1),
		1453	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1229	{	1454	{
		1455	rekey .set<connection, &connection::rekey_cb > (this);
		1456	keepalive .set<connection, &connection::keepalive_cb > (this);
		1457	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1458
		1459	last_establish_attempt = 0.;
1230	octx = ictx = 0;	1460	octx = ictx = 0;
1231	retry_cnt = 0;
1232		1461
1233	if (!conf->protocols) // make sure some protocol is enabled	1462	connectmode = conf->connectmode;
1234	conf->protocols = PROT_UDPv4;
1235		1463
1236	connectmode = conf_node::C_ALWAYS; // initial setting	1464	// queue a dummy packet to force an initial connection attempt
		1465	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1466	vpn_queue.put (new net_packet);
		1467
1237	reset_connection ();	1468	reset_connection ("startup");
1238	}	1469	}
1239		1470
1240	connection::~connection ()	1471	connection::~connection ()
1241	{	1472	{
1242	shutdown ();	1473	shutdown ();
1243	}	1474	}
1244		1475
		1476	void
1245	void connection_init ()	1477	connection_init ()
1246	{	1478	{
1247	auth_rate_limiter.clear ();	1479	auth_rate_limiter.clear ();
1248	reset_rate_limiter.clear ();	1480	reset_rate_limiter.clear ();
1249	}	1481	}
1250		1482

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Comparing gvpe/src/connection.C (file contents): Revision 1.40 by pcg, Tue Mar 1 06:27:20 2005 UTC vs. Revision 1.108 by root, Fri Oct 11 04:07:24 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.40 by pcg, Tue Mar 1 06:27:20 2005 UTC vs.
Revision 1.108 by root, Fri Oct 11 04:07:24 2013 UTC