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

Comparing gvpe/src/connection.C (file contents):
Revision 1.14 by pcg, Fri Aug 8 09:29:22 2003 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
3		4
		5	This file is part of GVPE.
		6
4	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
5	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
6	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
7	(at your option) any later version.	10	option) any later version.
8		11
9	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
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
12	GNU General Public License for more details.	15	Public License for more details.
13		16
14	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
15	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
16	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.
17	*/	30	*/
18		31
19	#include "config.h"	32	#include "config.h"
20		33
21	extern "C" {
22	# include "lzf/lzf.h"
23	}
24
25	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
26		37
27	#include <openssl/rand.h>	38	#include <openssl/rand.h>
28	#include <openssl/evp.h>	39	#include <openssl/evp.h>
29	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
30	#include <openssl/err.h>	41	#include <openssl/err.h>
31
32	#include "gettext.h"
33		42
34	#include "conf.h"	43	#include "conf.h"
35	#include "slog.h"	44	#include "slog.h"
36	#include "device.h"	45	#include "device.h"
37	#include "vpn.h"	46	#include "vpn.h"
38	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
39		49
40	#if !HAVE_RAND_PSEUDO_BYTES	50	#include "netcompat.h"
41	# define RAND_pseudo_bytes RAND_bytes
42	#endif
43		51
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	52	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
		53	#define MAGIC "HUHN\xbd\xc6\xdb\x82" // 8 bytes of magic//D
		54
		55	#define ULTRA_FAST 1
		56	#define HLOG 15
		57	#include "lzf/lzf.h"
		58	#include "lzf/lzf_c.c"
		59	#include "lzf/lzf_d.c"
		60
		61	//////////////////////////////////////////////////////////////////////////////
		62
		63	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		64	static ev::child rs_child_ev;
		65
		66	namespace
		67	{
		68	void // c++ requires external linkage here, apparently :(
		69	rs_child_cb (ev::child &w, int revents)
		70	{
		71	w.stop ();
		72
		73	if (rs_queue.empty ())
		74	return;
		75
		76	pid_t pid = run_script (*rs_queue.front ().first, false);
		77	if (pid)
		78	{
		79	w.set (pid);
		80	w.start ();
		81	}
		82	else
		83	slog (L_WARN, rs_queue.front ().second);
		84
		85	delete rs_queue.front ().first;
		86	rs_queue.pop ();
		87	}
		88	};
		89
		90	// despite the fancy name, this is quite a hack
		91	static void
		92	run_script_queued (run_script_cb cb, const char warnmsg)
		93	{
		94	rs_queue.push (std::make_pair (cb, warnmsg));
		95
		96	if (!rs_child_ev.is_active ())
		97	{
		98	rs_child_ev.set<rs_child_cb> ();
		99	rs_child_ev ();
		100	}
		101	}
		102
		103	//////////////////////////////////////////////////////////////////////////////
45		104
46	struct crypto_ctx	105	struct crypto_ctx
47	{	106	{
48	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	108	HMAC_CTX hctx;
50		109
51	crypto_ctx (const rsachallenge &challenge, int enc);	110	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
52	~crypto_ctx ();	111	~crypto_ctx ();
53	};	112	};
54		113
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	114	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
56	{	115	{
		116	ecdh_key s;
		117
		118	curve25519_combine (a, b, s);
		119
		120	{
		121	u8 mac_key[MAC_KEYSIZE];
		122	static const unsigned char mac_info[] = "gvpe mac key";
		123
		124	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		125	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		126	kdf.extract (s, sizeof (s));
		127	kdf.extract_done (HKDF_PRF_HASH ());
		128	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		129
		130	HMAC_CTX_init (&hctx);
		131	require (HMAC_Init_ex (&hctx, mac_key, MAC_KEYSIZE, MAC_DIGEST (), 0));
		132	}
		133
		134	{
		135	u8 cipher_key[CIPHER_KEYSIZE];
		136	static const unsigned char cipher_info[] = "gvpe cipher key";
		137
		138	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		139	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		140	kdf.extract (s, sizeof (s));
		141	kdf.extract_done (HKDF_PRF_HASH ());
		142	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		143
57	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
59	HMAC_CTX_init (&hctx);	146	}
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	147	}
62		148
63	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
64	{	150	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
67	}	153	}
68		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;
		180	}
		181
69	static void	182	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, auth_mac &mac)
71	{	184	{
72	EVP_MD_CTX ctx;	185	HMAC_CTX ctx;
73		186
74	EVP_MD_CTX_init (&ctx);	187	HMAC_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	188	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	189	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	190	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);
79	EVP_MD_CTX_cleanup (&ctx);	191	HMAC_CTX_cleanup (&ctx);
80	}	192	}
81		193
82	struct rsa_entry {	194	void
83	tstamp expire;	195	connection::generate_auth_data ()
84	rsaid id;
85	rsachallenge chg;
86	};
87
88	struct rsa_cache : list<rsa_entry>
89	{	196	{
90	void cleaner_cb (time_watcher &w); time_watcher cleaner;	197	if (auth_expire < ev_now ())
91
92	bool find (const rsaid &id, rsachallenge &chg)
93	{
94	for (iterator i = begin (); i != end (); ++i)
95	{
96	if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
97	{
98	memcpy (&chg, &i->chg, sizeof chg);
99
100	erase (i);
101	return true;
102	}
103	}
104
105	if (cleaner.at < NOW)
106	cleaner.start (NOW + RSA_TTL);
107
108	return false;
109	}
110
111	void gen (rsaid &id, rsachallenge &chg)
112	{
113	rsa_entry e;
114
115	RAND_bytes ((unsigned char *)&id, sizeof id);
116	RAND_bytes ((unsigned char *)&chg, sizeof chg);
117
118	e.expire = NOW + RSA_TTL;
119	e.id = id;
120	memcpy (&e.chg, &chg, sizeof chg);
121
122	push_back (e);
123
124	if (cleaner.at < NOW)
125	cleaner.start (NOW + RSA_TTL);
126	}
127
128	rsa_cache ()
129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	198	{
		199	// request data
		200	rand_fill (snd_auth.rsa);
		201	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		202	auth_hash (snd_auth, snd_auth_mac);
131		203
132	} rsa_cache;	204	// eventual response data
133		205	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{
136	if (empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	206	}
140	w.at = NOW + RSA_TTL;
141		207
142	for (iterator i = begin (); i != end (); )	208	// every use prolongs the expiry
143	if (i->expire <= NOW)	209	auth_expire = ev_now () + AUTH_TTL;
144	i = erase (i);
145	else
146	++i;
147	}
148	}	210	}
149		211
150	//////////////////////////////////////////////////////////////////////////////	212	//////////////////////////////////////////////////////////////////////////////
151		213
152	void pkt_queue::put (net_packet *p)	214	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		215	: max_ttl (max_ttl), max_queue (max_queue)
153	{	216	{
154	if (queue[i])	217	queue = new pkt [max_queue];
155	{
156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;
158	}
159		218
160	queue[i] = p;
161
162	i = (i + 1) % QUEUEDEPTH;
163	}
164
165	net_packet *pkt_queue::get ()
166	{
167	net_packet *p = queue[j];
168
169	if (p)
170	{
171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;
173	}
174
175	return p;
176	}
177
178	pkt_queue::pkt_queue ()
179	{
180	memset (queue, 0, sizeof (queue));
181	i = 0;	219	i = 0;
182	j = 0;	220	j = 0;
		221
		222	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
183	}	223	}
184		224
185	pkt_queue::~pkt_queue ()	225	pkt_queue::~pkt_queue ()
186	{	226	{
187	for (i = QUEUEDEPTH; --i > 0; )	227	while (net_packet *p = get ())
		228	delete p;
		229
188	delete queue[i];	230	delete [] queue;
189	}	231	}
190		232
		233	void
		234	pkt_queue::expire_cb (ev::timer &w, int revents)
		235	{
		236	ev_tstamp expire = ev_now () - max_ttl;
		237
		238	for (;;)
		239	{
		240	if (empty ())
		241	break;
		242
		243	double diff = queue[j].tstamp - expire;
		244
		245	if (diff >= 0.)
		246	{
		247	w.start (diff > 0.5 ? diff : 0.5);
		248	break;
		249	}
		250
		251	delete get ();
		252	}
		253	}
		254
		255	void
		256	pkt_queue::put (net_packet *p)
		257	{
		258	ev_tstamp now = ev_now ();
		259
		260	// start expiry timer
		261	if (empty ())
		262	expire.start (max_ttl);
		263
		264	int ni = i + 1 == max_queue ? 0 : i + 1;
		265
		266	if (ni == j)
		267	delete get ();
		268
		269	queue[i].pkt = p;
		270	queue[i].tstamp = now;
		271
		272	i = ni;
		273	}
		274
		275	net_packet *
		276	pkt_queue::get ()
		277	{
		278	if (empty ())
		279	return 0;
		280
		281	net_packet *p = queue[j].pkt;
		282	queue[j].pkt = 0;
		283
		284	j = j + 1 == max_queue ? 0 : j + 1;
		285
		286	return p;
		287	}
		288
191	struct net_rateinfo {	289	struct net_rateinfo
		290	{
192	u32 host;	291	u32 host;
193	double pcnt, diff;	292	double pcnt, diff;
194	tstamp last;	293	tstamp last;
195	};	294	};
196		295
197	// only do action once every x seconds per host whole allowing bursts.	296	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	297	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	298	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	299	struct net_rate_limiter : list<net_rateinfo>
201	{	300	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	301	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	302	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	303	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	304	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		305
207	bool can (const sockinfo &si) { return can((u32)si.host); }	306	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	307	bool can (u32 host);
209	};	308	};
210		309
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	310	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		311
		312	bool
213	bool net_rate_limiter::can (u32 host)	313	net_rate_limiter::can (u32 host)
214	{	314	{
215	iterator i;	315	iterator i;
216		316
217	for (i = begin (); i != end (); )	317	for (i = begin (); i != end (); )
218	if (i->host == host)	318	if (i->host == host)
219	break;	319	break;
220	else if (i->last < NOW - EXPIRE)	320	else if (i->last < ev_now () - NRL_EXPIRE)
221	i = erase (i);	321	i = erase (i);
222	else	322	else
223	i++;	323	i++;
224		324
225	if (i == end ())	325	if (i == end ())
226	{	326	{
227	net_rateinfo ri;	327	net_rateinfo ri;
228		328
229	ri.host = host;	329	ri.host = host;
230	ri.pcnt = 1.;	330	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	331	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	332	ri.last = ev_now ();
233		333
234	push_front (ri);	334	push_front (ri);
235		335
236	return true;	336	return true;
237	}	337	}
238	else	338	else
239	{	339	{
240	net_rateinfo ri (*i);	340	net_rateinfo ri (*i);
241	erase (i);	341	erase (i);
242		342
243	ri.pcnt = ri.pcnt * ALPHA;	343	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	344	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
245		345
246	ri.last = NOW;	346	ri.last = ev_now ();
247		347
248	double dif = ri.diff / ri.pcnt;	348	double dif = ri.diff / ri.pcnt;
249		349
250	bool send = dif > CUTOFF;	350	bool send = dif > NRL_CUTOFF;
251		351
252	if (dif > MAXDIF)	352	if (dif > NRL_MAXDIF)
253	{	353	{
254	ri.pcnt = 1.;	354	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	355	ri.diff = NRL_MAXDIF;
256	}	356	}
257	else if (send)	357	else if (send)
258	ri.pcnt++;	358	ri.pcnt++;
259		359
260	push_front (ri);	360	push_front (ri);
265		365
266	/////////////////////////////////////////////////////////////////////////////	366	/////////////////////////////////////////////////////////////////////////////
267		367
268	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	368	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
269		369
		370	void
270	void hmac_packet::hmac_gen (crypto_ctx *ctx)	371	hmac_packet::hmac_gen (crypto_ctx *ctx)
271	{	372	{
272	unsigned int xlen;	373	unsigned int xlen;
273		374
274	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
275		376
276	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
277	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
278	len - sizeof (hmac_packet));	379	len - sizeof (hmac_packet)));
279	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	380	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
280	}	381	}
281		382
282	void	383	void
283	hmac_packet::hmac_set (crypto_ctx *ctx)	384	hmac_packet::hmac_set (crypto_ctx *ctx)
284	{	385	{
…		…
293	hmac_gen (ctx);	394	hmac_gen (ctx);
294		395
295	return !memcmp (hmac, hmac_digest, HMACLENGTH);	396	return !memcmp (hmac, hmac_digest, HMACLENGTH);
296	}	397	}
297		398
		399	void
298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	400	vpn_packet::set_hdr (ptype type_, unsigned int dst)
299	{	401	{
300	type = type_;	402	type = type_;
301		403
302	int src = THISNODE->id;	404	int src = THISNODE->id;
303		405
…		…
307	}	409	}
308		410
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	411	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	412	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		413
312	struct vpndata_packet:vpn_packet	414	struct vpndata_packet : vpn_packet
		415	{
		416	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		417
		418	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		419	tap_packet unpack (connection conn, u32 &seqno);
		420
		421	private:
		422	const u32 data_hdr_size () const
313	{	423	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315
316	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
317	tap_packet unpack (connection conn, u32 &seqno);
318	private:
319
320	const u32 data_hdr_size () const
321	{
322	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	424	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
323	}
324	};	425	}
		426	};
325		427
326	void	428	void
327	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	429	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
328	{	430	{
329	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	431	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
330	int outl = 0, outl2;	432	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	433	ptype type = PT_DATA_UNCOMPRESSED;
332		434
333	#if ENABLE_COMPRESSION	435	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	436	u8 cdata[MAX_MTU];
335	u32 cl;
336		437
		438	if (conn->features & FEATURE_COMPRESSION)
		439	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	440	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		441
338	if (cl)	442	if (cl)
339	{	443	{
340	type = PT_DATA_COMPRESSED;	444	type = PT_DATA_COMPRESSED;
341	d = cdata;	445	d = cdata;
342	l = cl + 2;	446	l = cl + 2;
343		447
344	d[0] = cl >> 8;	448	d[0] = cl >> 8;
345	d[1] = cl;	449	d[1] = cl;
		450	}
346	}	451	}
347	#endif	452	#endif
348		453
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	454	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
350		455
351	struct {	456	struct {
352	#if RAND_SIZE	457	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	458	u8 rnd[RAND_SIZE];
354	#endif	459	#endif
355	u32 seqno;	460	u32 seqno;
356	} datahdr;	461	} datahdr;
357		462
358	datahdr.seqno = ntohl (seqno);	463	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	464	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	465	// NB: a constant (per session) random prefix
		466	// is likely enough, but we don't take any chances.
		467	conn->oiv.get (datahdr.rnd, RAND_SIZE);
361	#endif	468	#endif
362		469
363	EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	472	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	473	outl += outl2;
367		474
368	EVP_EncryptUpdate (cctx,	475	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	476	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	477	(unsigned char *) d, l));
371	outl += outl2;	478	outl += outl2;
372		479
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	480	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	481	outl += outl2;
375		482
376	len = outl + data_hdr_size ();	483	len = outl + data_hdr_size ();
377		484
378	set_hdr (type, dst);	485	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	494	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
389	u8 *d;	496	u8 *d;
390	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
391		498
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
393		500
394	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
396		503
397	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
398	d = cdata;	505	d = cdata;
399	else	506	else
400	#endif	507	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
402		509
403	/* this overwrites part of the src mac, but we fix that later */	510	// we play do evil games with the struct layout atm.
		511	// pending better solutions, we at least do some verification.
		512	// this is fine, as we left ISO territory long ago.
		513	require (DATAHDR <= 16);
		514	require ((u8 )(&p->len + 1) == &(p)[0]);
		515
		516	// this can overwrite the len/dst/src fields
404	EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	518	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	519	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	520	outl += outl2;
408		521
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	522	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	523	outl += outl2;
411		524
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	525	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		526
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	527	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
439	}	552	}
440	};	553	};
441		554
442	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
443	{	556	{
444	// actually, hmaclen cannot be checked because the hmac	557	u8 serial[SERIAL_SIZE];
445	// field comes before this data, so peers with other
446	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	558	u8 prot_major, prot_minor, randsize;
448	u8 flags, challengelen, pad2, pad3;	559	u8 flags, features, pad6, pad7, pad8;
449	u32 cipher_nid, digest_nid, hmac_nid;	560	u32 cipher_nid, mac_nid, auth_nid;
450		561
451	const u8 curflags () const	562	void setup (ptype type, int dst);
		563	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
		564
		565	static u8 get_features ()
452	{	566	{
		567	u8 f = 0;
		568	#if ENABLE_COMPRESSION
		569	f \|= FEATURE_COMPRESSION;
		570	#endif
		571	#if ENABLE_ROHC
		572	f \|= FEATURE_ROHC;
		573	#endif
		574	#if ENABLE_BRIDGING
		575	f \|= FEATURE_BRIDGING;
		576	#endif
453	return 0x80	577	return f;
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}	578	}
456
457	void setup (ptype type, int dst);
458	bool chk_config () const;
459	};	579	};
460		580
		581	void
461	void config_packet::setup (ptype type, int dst)	582	config_packet::setup (ptype type, int dst)
462	{	583	{
463	prot_major = PROTOCOL_MAJOR;	584	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	585	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	586	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	587	flags = 0;
467	flags = curflags ();	588	features = get_features ();
468	challengelen = sizeof (rsachallenge);
469		589
		590	strncpy ((char *)serial, conf.serial, sizeof (serial));
		591
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	592	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	593	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		594	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
473		595
474	len = sizeof (*this) - sizeof (net_packet);	596	len = sizeof (*this) - sizeof (net_packet);
475	set_hdr (type, dst);	597	set_hdr (type, dst);
476	}	598	}
477		599
478	bool config_packet::chk_config () const	600	bool
		601	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
479	{	602	{
480	return prot_major == PROTOCOL_MAJOR	603	if (prot_major != PROTOCOL_MAJOR)
481	&& randsize == RAND_SIZE	604	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
482	&& hmaclen == HMACLENGTH	605	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
483	&& flags == curflags ()	606	else if (randsize != RAND_SIZE)
484	&& challengelen == sizeof (rsachallenge)	607	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
		608	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
485	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	609	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
486	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	610	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
487	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	611	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
488	}	612	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
		613	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		614	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		615	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		616	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		617	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
		618	else
		619	{
		620	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
489		621
		622	if (cmp > 0)
		623	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		624	conf->nodename, (const char *)rsi);
		625	else if (cmp == 0)
		626	return true;
		627	}
		628
		629	return false;
		630	}
		631
490	struct auth_req_packet : config_packet	632	struct auth_req_packet : config_packet // UNPROTECTED
491	{	633	{
492	char magic[8];	634	char magic[8];
493	u8 initiate; // false if this is just an automatic reply	635	u8 initiate; // false if this is just an automatic reply
494	u8 protocols; // supported protocols (will get patches on forward)	636	u8 protocols; // supported protocols (will be patched on forward)
495	u8 pad2, pad3;	637	u8 pad2, pad3;
496	rsaid id;	638	auth_encr encr;
497	rsaencrdata encr;
498		639
499	auth_req_packet (int dst, bool initiate_, u8 protocols_)	640	auth_req_packet (int dst, bool initiate_, u8 protocols_)
500	{	641	{
501	config_packet::setup (PT_AUTH_REQ, dst);	642	config_packet::setup (PT_AUTH_REQ, dst);
502	strncpy (magic, MAGIC, 8);	643	memcpy (magic, MAGIC, 8);
503	initiate = !!initiate_;	644	initiate = !!initiate_;
504	protocols = protocols_;	645	protocols = protocols_;
505		646
506	len = sizeof (*this) - sizeof (net_packet);	647	len = sizeof (*this) - sizeof (net_packet);
507	}	648	}
508	};	649	};
509		650
510	struct auth_res_packet : config_packet	651	struct auth_res_packet : vpn_packet // UNPROTECTED
511	{	652	{
512	rsaid id;
513	u8 pad1, pad2, pad3;
514	u8 response_len; // encrypted length
515	rsaresponse response;	653	auth_response response;
516		654
517	auth_res_packet (int dst)	655	auth_res_packet (int dst)
518	{	656	{
519	config_packet::setup (PT_AUTH_RES, dst);	657	set_hdr (PT_AUTH_RES, dst);
520		658
521	len = sizeof (*this) - sizeof (net_packet);	659	len = sizeof (*this) - sizeof (net_packet);
522	}	660	}
523	};	661	};
524		662
…		…
554	};	692	};
555		693
556	/////////////////////////////////////////////////////////////////////////////	694	/////////////////////////////////////////////////////////////////////////////
557		695
558	void	696	void
559	connection::connection_established ()	697	connection::connection_established (const sockinfo &rsi)
560	{	698	{
		699	if (!have_snd_auth \|\| !have_rcv_auth)
		700	return;
		701
		702	si = rsi;
		703	protocol = rsi.prot;
		704
		705	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		706	conf->nodename, (const char *)rsi,
		707	is_direct ? "direct" : "forwarded",
		708	PROTOCOL_MAJOR, prot_minor);
		709
		710	if (::conf.script_node_up)
		711	{
		712	run_script_cb *cb = new run_script_cb;
		713	cb->set<connection, &connection::script_node_up> (this);
		714	run_script_queued (cb, _("node-up command execution failed, continuing."));
		715	}
		716
		717	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		718	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		719
		720	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		721	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		722
		723	oiv.reset ();
		724
		725	// make sure rekeying timeouts are slightly asymmetric
		726	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		727	rekey.start (rekey_interval, rekey_interval);
		728
		729	keepalive.start (::conf.keepalive);
		730
		731	// send queued packets
561	if (ictx && octx)	732	if (ictx && octx)
562	{	733	{
563	connectmode = conf->connectmode;	734	while (tap_packet p = (tap_packet )data_queue.get ())
564
565	rekey.start (NOW + ::conf.rekey);
566	keepalive.start (NOW + ::conf.keepalive);
567
568	// send queued packets
569	if (ictx && octx)
570	{	735	{
571	while (tap_packet p = (tap_packet )data_queue.get ())
572	{
573	send_data_packet (p);	736	if (p->len) send_data_packet (p);
574	delete p;	737	delete p;
575	}
576
577	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
578	{
579	send_vpn_packet (p, si, IPTOS_RELIABILITY);
580	delete p;
581	}
582	}	738	}
		739
		740	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		741	{
		742	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		743	delete p;
		744	}
583	}	745	}
		746
		747	vpn->connection_established (this);
		748	}
		749
		750	void
		751	connection::reset_si ()
		752	{
		753	if (vpn->can_direct (THISNODE, conf))
		754	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
584	else	755	else
585	{	756	{
586	retry_cnt = 0;	757	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
587	establish_connection.start (NOW + 5);	758	protocol = 0;
588	keepalive.reset ();
589	rekey.reset ();
590	}	759	}
591	}
592
593	void
594	connection::reset_si ()
595	{
596	protocol = best_protocol (THISNODE->protocols & conf->protocols);
597
598	// mask out protocols we cannot establish
599	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
600	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
601		760
602	si.set (conf, protocol);	761	si.set (conf, protocol);
		762
		763	is_direct = si.valid ();
603	}	764	}
604		765
605	// ensure sockinfo is valid, forward if necessary	766	// ensure sockinfo is valid, forward if necessary
606	const sockinfo &	767	const sockinfo &
607	connection::forward_si (const sockinfo &si) const	768	connection::forward_si (const sockinfo &si) const
608	{	769	{
609	if (!si.valid ())	770	if (!si.valid ())
610	{	771	{
611	connection *r = vpn->find_router ();	772	connection *r = vpn->find_router_for (this);
612		773
613	if (r)	774	if (r)
614	{	775	{
615	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	776	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
616	conf->nodename, r->conf->nodename);	777	conf->nodename, r->conf->nodename);
617	return r->si;	778	return r->si;
618	}	779	}
619	else	780	else
620	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	781	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
621	conf->nodename);	782	conf->nodename);
622	}	783	}
623		784
624	return si;	785	return si;
625	}	786	}
…		…
635	connection::send_ping (const sockinfo &si, u8 pong)	796	connection::send_ping (const sockinfo &si, u8 pong)
636	{	797	{
637	ping_packet *pkt = new ping_packet;	798	ping_packet *pkt = new ping_packet;
638		799
639	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	800	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		801
		802	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
640	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	803	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
641		804
642	delete pkt;	805	delete pkt;
643	}	806	}
644		807
…		…
659	void	822	void
660	connection::send_auth_request (const sockinfo &si, bool initiate)	823	connection::send_auth_request (const sockinfo &si, bool initiate)
661	{	824	{
662	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	825	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
663		826
664	rsachallenge chg;	827	generate_auth_data ();
		828	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
665		829
666	rsa_cache.gen (pkt->id, chg);
667
668	if (0 > RSA_public_encrypt (sizeof chg,
669	(unsigned char )&chg, (unsigned char )&pkt->encr,
670	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
671	fatal ("RSA_public_encrypt error");
672
673	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	830	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
674
675	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	831	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
676		832
677	delete pkt;	833	delete pkt;
678	}	834	}
679		835
680	void	836	void
681	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	837	connection::send_auth_response (const sockinfo &si)
682	{	838	{
683	auth_res_packet *pkt = new auth_res_packet (conf->id);	839	auth_res_packet *pkt = new auth_res_packet (conf->id);
684		840
685	pkt->id = id;	841	auth_hash (rcv_auth, pkt->response.mac);
		842	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
686		843
687	rsa_hash (id, chg, pkt->response);
688
689	pkt->hmac_set (octx);
690
691	slog (L_TRACE, ">>%d PT_AUTH_RES [%s]", conf->id, (const char *)si);	844	slog (L_TRACE, "%s << PT_AUTH_RES [%s]", conf->nodename, (const char *)si);
692
693	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	845	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
694		846
695	delete pkt;	847	delete pkt;
696	}	848	}
697		849
698	void	850	void
699	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	851	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
700	{	852	{
701	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	853	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
702	conf->id, rid, (const char *)rsi);	854	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		855	conf->protocols);
703		856
704	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	857	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
705		858
706	r->hmac_set (octx);	859	r->hmac_set (octx);
707	send_vpn_packet (r, si);	860	send_vpn_packet (r, si);
708		861
709	delete r;	862	delete r;
710	}	863	}
711		864
712	void	865	inline void
713	connection::establish_connection_cb (time_watcher &w)	866	connection::establish_connection_cb (ev::timer &w, int revents)
714	{	867	{
715	if (ictx \|\| conf == THISNODE	868	if (!(ictx && octx)
		869	&& conf != THISNODE
716	\|\| connectmode == conf_node::C_NEVER	870	&& connectmode != conf_node::C_NEVER
717	\|\| connectmode == conf_node::C_DISABLED)	871	&& connectmode != conf_node::C_DISABLED
718	w.at = TSTAMP_CANCEL;	872	&& !w.is_active ())
719	else if (w.at <= NOW)
720	{	873	{
721	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	874	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
722		875	// and stop trying. should probably be handled by a per-connection expire handler.
723	if (retry_int < 3600 * 8)	876	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		877	{
		878	reset_connection ();
724	retry_cnt++;	879	return;
		880	}
725		881
726	w.at = NOW + retry_int;	882	last_establish_attempt = ev_now ();
		883
		884	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		885	? (retry_cnt & 3) + 1
		886	: 1 << (retry_cnt >> 2));
727		887
728	reset_si ();	888	reset_si ();
729		889
730	if (si.prot && !si.host)	890	bool slow = si.prot & PROT_SLOW;
		891
		892	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		893	{
		894	/TODO/ /* start the timer so we don't recurse endlessly */
		895	w.start (1);
731	vpn->send_connect_request (conf->id);	896	vpn->send_connect_request (this);
		897	}
732	else	898	else
733	{	899	{
		900	if (si.valid ())
		901	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		902	conf->nodename, (const char *)si);
		903
734	const sockinfo &dsi = forward_si (si);	904	const sockinfo &dsi = forward_si (si);
		905
		906	slow = slow \|\| (dsi.prot & PROT_SLOW);
735		907
736	if (dsi.valid () && auth_rate_limiter.can (dsi))	908	if (dsi.valid () && auth_rate_limiter.can (dsi))
737	{	909	{
738	if (retry_cnt < 4)	910	if (retry_cnt < 4)
739	send_auth_request (dsi, true);	911	send_auth_request (dsi, true);
740	else	912	else
741	send_ping (dsi, 0);	913	send_ping (dsi, 0);
742	}	914	}
743	}	915	}
		916
		917	retry_int *= slow ? 8. : 0.9;
		918
		919	if (retry_int < conf->max_retry)
		920	retry_cnt++;
		921	else
		922	retry_int = conf->max_retry;
		923
		924	w.start (retry_int);
744	}	925	}
745	}	926	}
746		927
747	void	928	void
748	connection::reset_connection ()	929	connection::reset_connection ()
…		…
751	{	932	{
752	slog (L_INFO, _("%s(%s): connection lost"),	933	slog (L_INFO, _("%s(%s): connection lost"),
753	conf->nodename, (const char *)si);	934	conf->nodename, (const char *)si);
754		935
755	if (::conf.script_node_down)	936	if (::conf.script_node_down)
756	run_script (run_script_cb (this, &connection::script_node_down), false);	937	{
		938	run_script_cb *cb = new run_script_cb;
		939	cb->set<connection, &connection::script_node_down> (this);
		940	run_script_queued (cb, _("node-down command execution failed, continuing."));
		941	}
757	}	942	}
758		943
759	delete ictx; ictx = 0;	944	delete ictx; ictx = 0;
760	delete octx; octx = 0;	945	delete octx; octx = 0;
761		946
762	si.host= 0;	947	si.host = 0;
763		948
		949	have_snd_auth = false;
		950	have_rcv_auth = false;
		951	auth_expire = 0.;
		952
764	last_activity = 0;	953	last_activity = 0.;
		954	//last_si_change = 0.;
765	retry_cnt = 0;	955	retry_cnt = 0;
766		956
767	rekey.reset ();	957	rekey.stop ();
768	keepalive.reset ();	958	keepalive.stop ();
769	establish_connection.reset ();	959	establish_connection.stop ();
770	}	960	}
771		961
772	void	962	void
773	connection::shutdown ()	963	connection::shutdown ()
774	{	964	{
…		…
776	send_reset (si);	966	send_reset (si);
777		967
778	reset_connection ();	968	reset_connection ();
779	}	969	}
780		970
781	void	971	// poor-man's rekeying
782	connection::rekey_cb (time_watcher &w)	972	inline void
		973	connection::rekey_cb (ev::timer &w, int revents)
783	{	974	{
784	w.at = TSTAMP_CANCEL;
785
786	reset_connection ();	975	reset_connection ();
787	establish_connection ();	976	establish_connection ();
788	}	977	}
789		978
790	void	979	void
791	connection::send_data_packet (tap_packet *pkt, bool broadcast)	980	connection::send_data_packet (tap_packet *pkt)
792	{	981	{
793	vpndata_packet *p = new vpndata_packet;	982	vpndata_packet *p = new vpndata_packet;
794	int tos = 0;	983	int tos = 0;
795		984
796	// I am not hilarious about peeking into packets, but so be it.	985	// I am not hilarious about peeking into packets, but so be it.
797	if (conf->inherit_tos	986	if (conf->inherit_tos && pkt->is_ipv4 ())
798	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
799	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
800	tos = (*pkt)[15] & IPTOS_TOS_MASK;	987	tos = (*pkt)[15] & IPTOS_TOS_MASK;
801		988
802	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	989	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
803	send_vpn_packet (p, si, tos);	990	send_vpn_packet (p, si, tos);
804		991
805	delete p;	992	delete p;
806		993
807	if (oseqno > MAX_SEQNO)	994	if (oseqno > MAX_SEQNO)
808	rekey ();	995	rekey ();
809	}	996	}
810		997
811	void	998	void
		999	connection::post_inject_queue ()
		1000	{
		1001	// force a connection every now and when when packets are sent (max 1/s)
		1002	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		1003	establish_connection.stop ();
		1004
		1005	establish_connection ();
		1006	}
		1007
		1008	void
812	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	1009	connection::inject_data_packet (tap_packet *pkt)
813	{	1010	{
814	if (ictx && octx)	1011	if (ictx && octx)
815	send_data_packet (pkt, broadcast);	1012	send_data_packet (pkt);
816	else	1013	else
817	{	1014	{
818	if (!broadcast)//DDDD
819	data_queue.put (new tap_packet (*pkt));	1015	data_queue.put (new tap_packet (*pkt));
820		1016	post_inject_queue ();
821	establish_connection ();
822	}	1017	}
823	}	1018	}
824		1019
		1020	void
825	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1021	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
826	{	1022	{
827	if (ictx && octx)	1023	if (ictx && octx)
828	send_vpn_packet (pkt, si, tos);	1024	send_vpn_packet (pkt, si, tos);
829	else	1025	else
830	{	1026	{
831	vpn_queue.put (new vpn_packet (*pkt));	1027	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
832		1028	post_inject_queue ();
833	establish_connection ();
834	}	1029	}
835	}	1030	}
836		1031
837	void	1032	void
838	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1033	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
839	{	1034	{
840	last_activity = NOW;	1035	last_activity = ev_now ();
841		1036
842	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1037	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
843	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1038	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1039
		1040	if (connectmode == conf_node::C_DISABLED)
		1041	return;
844		1042
845	switch (pkt->typ ())	1043	switch (pkt->typ ())
846	{	1044	{
847	case vpn_packet::PT_PING:	1045	case vpn_packet::PT_PING:
		1046	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1047
848	// we send pings instead of auth packets after some retries,	1048	// we send pings instead of auth packets after some retries,
849	// so reset the retry counter and establish a connection	1049	// so reset the retry counter and establish a connection
850	// when we receive a ping.	1050	// when we receive a ping.
851	if (!ictx)	1051	if (!ictx)
852	{	1052	{
853	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
854	send_auth_request (rsi, true);	1054	send_auth_request (rsi, true);
855	}	1055	}
856	else	1056	else
		1057	// we would love to change the socket address here, but ping's aren't
		1058	// authenticated, so we best ignore it.
857	send_ping (rsi, 1); // pong	1059	send_ping (rsi, 1); // pong
858		1060
859	break;	1061	break;
860		1062
861	case vpn_packet::PT_PONG:	1063	case vpn_packet::PT_PONG:
		1064	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1065
		1066	// a PONG might mean that the other side doesn't really know
		1067	// about our desire for communication.
		1068	establish_connection ();
862	break;	1069	break;
863		1070
864	case vpn_packet::PT_RESET:	1071	case vpn_packet::PT_RESET:
865	{	1072	{
866	reset_connection ();	1073	reset_connection ();
867		1074
868	config_packet p = (config_packet ) pkt;	1075	config_packet p = (config_packet ) pkt;
869		1076
870	if (!p->chk_config ())	1077	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
871	{
872	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
873	conf->nodename, (const char *)rsi);
874	connectmode = conf_node::C_DISABLED;
875	}
876	else if (connectmode == conf_node::C_ALWAYS)
877	establish_connection ();	1078	establish_connection ();
878	}	1079	}
879	break;	1080	break;
880		1081
881	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
882	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
883	{	1084	{
884	auth_req_packet p = (auth_req_packet ) pkt;	1085	auth_req_packet p = (auth_req_packet )pkt;
885		1086
886	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);
887		1090
888	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))
889	{	1097	{
890	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
891	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."),
892	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
893	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
894		1102
895	if (p->initiate)	1103	if (p->initiate)
896	send_auth_request (rsi, false);	1104	send_auth_request (rsi, false);
897		1105
898	rsachallenge k;	1106	auth_data auth;
899		1107
900	if (0 > RSA_private_decrypt (sizeof (p->encr),	1108	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
901	(unsigned char )&p->encr, (unsigned char )&k,	1109	{
902	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
903	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	1110	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
904	conf->nodename, (const char *)rsi);	1111	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		1112	}
905	else	1113	else
906	{	1114	{
907	delete octx;	1115	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
908		1116
909	octx = new crypto_ctx (k, 1);	1117	rcv_auth = auth;
910	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1118	have_rcv_auth = true;
911		1119
		1120	send_auth_response (rsi);
		1121
		1122	if (chg)
		1123	{
912	conf->protocols = p->protocols;	1124	conf->protocols = p->protocols;
		1125	features = p->features & config_packet::get_features ();
913		1126
914	send_auth_response (rsi, p->id, k);
915
916	connection_established ();	1127	connection_established (rsi);
917
918	break;	1128	}
919	}	1129	}
		1130
		1131	break;
920	}	1132	}
921		1133
922	send_reset (rsi);	1134	send_reset (rsi);
923	}	1135	}
924		1136
925	break;	1137	break;
926		1138
927	case vpn_packet::PT_AUTH_RES:	1139	case vpn_packet::PT_AUTH_RES:
928	{	1140	{
929	auth_res_packet p = (auth_res_packet ) pkt;	1141	auth_res_packet p = (auth_res_packet )pkt;
930		1142
931	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1143	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
932		1144
933	if (p->chk_config ())	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
934	{	1146	{
935	if (p->prot_minor != PROTOCOL_MINOR)
936	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
937	conf->nodename, (const char *)rsi,
938	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
939
940	rsachallenge chg;
941
942	if (!rsa_cache.find (p->id, chg))
943	{
944	slog (L_ERR, _("%s(%s): unrequested auth response"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
945	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
946	break;
947	}
948	else
949	{
950	crypto_ctx *cctx = new crypto_ctx (chg, 0);
951
952	if (!p->hmac_chk (cctx))
953	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
954	"could be an attack, or just corruption or an synchronization error"),
955	conf->nodename, (const char *)rsi);
956	else
957	{
958	rsaresponse h;
959
960	rsa_hash (p->id, chg, h);
961
962	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
963	{
964	prot_minor = p->prot_minor;
965
966	delete ictx; ictx = cctx;
967
968	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
969
970	si = rsi;
971	protocol = rsi.prot;
972
973	connection_established ();
974
975	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
976	conf->nodename, (const char *)rsi,
977	p->prot_major, p->prot_minor);
978
979	if (::conf.script_node_up)
980	run_script (run_script_cb (this, &connection::script_node_up), false);
981
982	break;
983	}
984	else
985	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
986	conf->nodename, (const char *)rsi);
987	}
988
989	delete cctx;
990	}
991	}	1149	}
		1150	else if (!have_snd_auth)
		1151	{
		1152	memcpy (snd_ecdh_b, p->response.ecdh, sizeof (snd_ecdh_b));
		1153
		1154	have_snd_auth = true;
		1155	connection_established (rsi);
		1156	}
		1157
		1158	break;
992	}	1159	}
993		1160
994	send_reset (rsi);	1161	send_reset (rsi);
995	break;	1162	break;
996		1163
…		…
1006	{	1173	{
1007	vpndata_packet p = (vpndata_packet )pkt;	1174	vpndata_packet p = (vpndata_packet )pkt;
1008		1175
1009	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1010	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1177	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1011	"could be an attack, or just corruption or an synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1012	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1013	else	1180	else
1014	{	1181	{
1015	u32 seqno;	1182	u32 seqno;
1016	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1017		1185
1018	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1019	{	1187	{
1020	vpn->tap->send (d);	1188	vpn->tap->send (d);
1021		1189
1022	if (p->dst () == 0) // re-broadcast
1023	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1024	{
1025	connection c = i;
1026
1027	if (c->conf != THISNODE && c->conf != conf)
1028	c->inject_data_packet (d);
1029	}
1030
1031	if (si != rsi)	1190	if (si != rsi)
1032	{	1191	{
1033	// fast re-sync on connection changes, useful especially for tcp/ip	1192	// fast re-sync on source address changes, useful especially for tcp/ip
		1193	//if (last_si_change < ev_now () + 5.)
1034	si = rsi;	1194	// {
1035
1036	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1037	conf->nodename, (const char )si, (const char )rsi);	1196	conf->nodename, (const char )si, (const char )rsi);
		1197
		1198	si = rsi;
		1199
		1200	if (::conf.script_node_change)
		1201	{
		1202	run_script_cb *cb = new run_script_cb;
		1203	cb->set<connection, &connection::script_node_change> (this);
		1204	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1205	}
		1206
		1207	// }
		1208	//else
		1209	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1210	// conf->nodename, (const char )si, (const char )rsi);
1038	}	1211	}
1039
1040	delete d;
1041
1042	break;
1043	}	1212	}
		1213	else if (seqclass == 1) // far history
		1214	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1215	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1216	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1217	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1218	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1219	else if (seqclass == 3) // reset
		1220	{
		1221	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1222	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1223	send_reset (rsi);
		1224	}
		1225
		1226	delete d;
		1227	break;
1044	}	1228	}
1045	}	1229	}
1046		1230
1047	send_reset (rsi);	1231	send_reset (rsi);
1048	break;	1232	break;
1049		1233
1050	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1051	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1052	{	1236	{
1053	connect_req_packet p = (connect_req_packet ) pkt;	1237	connect_req_packet p = (connect_req_packet )pkt;
1054		1238
1055	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1239	if (p->id > 0 && p->id <= vpn->conns.size ())
1056	connection *c = vpn->conns[p->id - 1];
1057	conf->protocols = p->protocols;
1058
1059	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
1060	conf->id, p->id, c->ictx && c->octx);
1061
1062	if (c->ictx && c->octx)
1063	{	1240	{
		1241	connection *c = vpn->conns[p->id - 1];
		1242	conf->protocols = p->protocols;
		1243
		1244	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1245	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1246	p->protocols,
		1247	c->ictx && c->octx);
		1248
		1249	if (c->ictx && c->octx)
		1250	{
1064	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1065	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
1066	c->send_connect_info (conf->id, si, conf->protocols);	1253	c->send_connect_info (conf->id, si, conf->protocols);
1067	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1254	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1255	}
		1256	else
		1257	c->establish_connection ();
1068	}	1258	}
1069	else	1259	else
1070	c->establish_connection ();	1260	slog (L_WARN,
		1261	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1262	p->id);
1071	}	1263	}
1072		1264
1073	break;	1265	break;
1074		1266
1075	case vpn_packet::PT_CONNECT_INFO:	1267	case vpn_packet::PT_CONNECT_INFO:
1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1268	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1077	{	1269	{
1078	connect_info_packet p = (connect_info_packet ) pkt;	1270	connect_info_packet p = (connect_info_packet )pkt;
1079		1271
1080	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1272	if (p->id > 0 && p->id <= vpn->conns.size ())
1081		1273	{
1082	connection *c = vpn->conns[p->id - 1];	1274	connection *c = vpn->conns[p->id - 1];
1083		1275
1084	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1085	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1277	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1086	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1087		1279
1088	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1280	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1089	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1281	conf->nodename,
		1282	vpn->conns[p->id - 1]->conf->nodename,
		1283	(const char *)p->si,
		1284	p->protocols,
		1285	protocol,
		1286	p->si.supported_protocols (c->conf),
		1287	!c->ictx && !c->octx);
1090		1288
1091	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1092		1290
1093	if (dsi.valid ())	1291	if (dsi.valid ())
1094	c->send_auth_request (dsi, true);	1292	c->send_auth_request (dsi, true);
		1293	else
		1294	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1295	vpn->conns[p->id - 1]->conf->nodename,
		1296	(const char *)p->si);
		1297	}
		1298	else
		1299	slog (L_WARN,
		1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1301	p->id);
1095	}	1302	}
1096		1303
1097	break;	1304	break;
1098		1305
1099	default:	1306	default:
1100	send_reset (rsi);	1307	send_reset (rsi);
1101	break;	1308	break;
1102	}	1309	}
1103	}	1310	}
1104		1311
1105	void connection::keepalive_cb (time_watcher &w)	1312	inline void
		1313	connection::keepalive_cb (ev::timer &w, int revents)
1106	{	1314	{
1107	if (NOW >= last_activity + ::conf.keepalive + 30)	1315	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1316
		1317	if (when >= 0)
		1318	w.start (when);
		1319	else if (when < -15)
1108	{	1320	{
1109	reset_connection ();	1321	reset_connection ();
1110	establish_connection ();	1322	establish_connection ();
1111	}	1323	}
1112	else if (NOW < last_activity + ::conf.keepalive)
1113	w.at = last_activity + ::conf.keepalive;
1114	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1115	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1116	{	1326	{
		1327	w.start (3);
1117	send_ping (si);	1328	send_ping (si);
1118	w.at = NOW + 5;
1119	}	1329	}
1120	else if (NOW < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1121	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1122	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1123	w.at = last_activity + ::conf.keepalive + 10;	1333	w.start (when + 10);
1124	else	1334	else
1125	reset_connection ();	1335	reset_connection ();
1126	}	1336	}
1127		1337
		1338	void
1128	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1129	{	1340	{
1130	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1341	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1131		1342
1132	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1343	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1344	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1345	THISNODE->protocols);
1133	p->hmac_set (octx);	1346	p->hmac_set (octx);
1134	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1135		1348
1136	delete p;	1349	delete p;
1137	}	1350	}
1138		1351
1139	void connection::script_node ()	1352	void
		1353	connection::script_init_env (const char *ext)
1140	{	1354	{
1141	vpn->script_if_up ();
1142
1143	char *env;	1355	char *env;
		1356	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1357	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1358	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1359	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1360	conf->id & 0xff); putenv (env);
		1361	}
		1362
		1363	void
		1364	connection::script_init_connect_env ()
		1365	{
		1366	vpn->script_init_env ();
		1367
		1368	char *env;
1144	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1369	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1370	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1145	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1146	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1147	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1148	}	1374	}
1149		1375
		1376	inline const char *
1150	const char *connection::script_node_up ()	1377	connection::script_node_up ()
1151	{	1378	{
1152	script_node ();	1379	script_init_connect_env ();
1153		1380
1154	putenv ("STATE=up");	1381	putenv ((char *)"STATE=up");
1155		1382
		1383	char *filename;
		1384	asprintf (&filename,
		1385	"%s/%s",
		1386	confbase,
1156	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1387	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1157	}
1158		1388
		1389	return filename;
		1390	}
		1391
		1392	inline const char *
		1393	connection::script_node_change ()
		1394	{
		1395	script_init_connect_env ();
		1396
		1397	putenv ((char *)"STATE=change");
		1398
		1399	char *filename;
		1400	asprintf (&filename,
		1401	"%s/%s",
		1402	confbase,
		1403	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1404
		1405	return filename;
		1406	}
		1407
		1408	inline const char *
1159	const char *connection::script_node_down ()	1409	connection::script_node_down ()
1160	{	1410	{
1161	script_node ();	1411	script_init_connect_env ();
1162		1412
1163	putenv ("STATE=down");	1413	putenv ((char *)"STATE=down");
1164		1414
1165	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1415	char *filename;
1166	}	1416	asprintf (&filename,
		1417	"%s/%s",
		1418	confbase,
		1419	::conf.script_node_down ? ::conf.script_node_down : "node-down");
1167		1420
		1421	return filename;
		1422	}
		1423
1168	connection::connection(struct vpn *vpn_)	1424	connection::connection (struct vpn vpn, conf_node conf)
1169	: vpn(vpn_)	1425	: vpn(vpn), conf(conf),
1170	, rekey (this, &connection::rekey_cb)	1426	#if ENABLE_DNS
1171	, keepalive (this, &connection::keepalive_cb)	1427	dns (0),
		1428	#endif
		1429	data_queue(conf->max_ttl, conf->max_queue + 1),
		1430	vpn_queue(conf->max_ttl, conf->max_queue + 1)
		1431	{
		1432	rekey .set<connection, &connection::rekey_cb > (this);
		1433	keepalive .set<connection, &connection::keepalive_cb > (this);
1172	, establish_connection (this, &connection::establish_connection_cb)	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1173	{	1435
		1436	last_establish_attempt = 0.;
1174	octx = ictx = 0;	1437	octx = ictx = 0;
1175	retry_cnt = 0;
1176		1438
1177	connectmode = conf_node::C_ALWAYS; // initial setting	1439	connectmode = conf->connectmode;
		1440
		1441	// queue a dummy packet to force an initial connection attempt
		1442	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1443	vpn_queue.put (new net_packet);
		1444
1178	reset_connection ();	1445	reset_connection ();
1179	}	1446	}
1180		1447
1181	connection::~connection ()	1448	connection::~connection ()
1182	{	1449	{
1183	shutdown ();	1450	shutdown ();
1184	}	1451	}
1185		1452
		1453	void
1186	void connection_init ()	1454	connection_init ()
1187	{	1455	{
1188	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1189	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1190	}	1458	}
1191		1459

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Comparing gvpe/src/connection.C (file contents): Revision 1.14 by pcg, Fri Aug 8 09:29:22 2003 UTC vs. Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.14 by pcg, Fri Aug 8 09:29:22 2003 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC