[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 1.116 by root, Mon Apr 1 03:10:26 2019 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>	3	Copyright (C) 2003-2008,2010,2011,2013,2016 Marc Lehmann <gvpe@schmorp.de>
4		4
		5	This file is part of GVPE.
		6
5	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
6	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
7	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
8	(at your option) any later version.	10	option) any later version.
9		11
10	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
11	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
12	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
13	GNU General Public License for more details.	15	Public License for more details.
14		16
15	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
16	along with this program; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
18	*/	30	*/
19		31
20	#include "config.h"	32	#include "config.h"
21		33
22	#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"
32
33	#include "conf.h"	44	#include "conf.h"
34	#include "slog.h"	45	#include "slog.h"
		46	#include "crypto.h"
35	#include "device.h"	47	#include "device.h"
36	#include "vpn.h"	48	#include "vpn.h"
37	#include "connection.h"	49	#include "connection.h"
		50	#include "hkdf.h"
38		51
39	#include "netcompat.h"	52	#include "netcompat.h"
40		53
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	54	#define MAGIC "gvpe\xbd\xc6\xdb\x82" // 8 bytes of magic
46		55
		56	#define LZF_STATE_ARG 1
47	#define ULTRA_FAST 1	57	#define ULTRA_FAST 1
48	#define HLOG 15	58	#define HLOG 15
49	#include "lzf/lzf.h"	59	#define INIT_HTAB 0
50	#include "lzf/lzf_c.c"	60	#include "lzf/lzf_c.c"
51	#include "lzf/lzf_d.c"	61	#include "lzf/lzf_d.c"
52		62
		63	//////////////////////////////////////////////////////////////////////////////
		64
		65	static std::queue< std::pair<run_script_cb , const char > > rs_queue;
		66	static ev::child rs_child_ev;
		67
		68	namespace
		69	{
		70	void // c++ requires external linkage here, apparently :(
		71	rs_child_cb (ev::child &w, int revents)
		72	{
		73	w.stop ();
		74
		75	if (rs_queue.empty ())
		76	return;
		77
		78	pid_t pid = run_script (*rs_queue.front ().first, false);
		79	if (pid)
		80	{
		81	w.set (pid);
		82	w.start ();
		83	}
		84	else
		85	slog (L_WARN, rs_queue.front ().second);
		86
		87	delete rs_queue.front ().first;
		88	rs_queue.pop ();
		89	}
		90	};
		91
		92	// despite the fancy name, this is quite a hack
		93	static void
		94	run_script_queued (run_script_cb cb, const char warnmsg)
		95	{
		96	rs_queue.push (std::make_pair (cb, warnmsg));
		97
		98	if (!rs_child_ev.is_active ())
		99	{
		100	rs_child_ev.set<rs_child_cb> ();
		101	rs_child_ev ();
		102	}
		103	}
		104
		105	//////////////////////////////////////////////////////////////////////////////
		106
53	struct crypto_ctx	107	struct crypto_ctx
54	{	108	{
55	EVP_CIPHER_CTX cctx;	109	cipher cctx;
56	HMAC_CTX hctx;	110	hmac hctx;
57		111
58	crypto_ctx (const rsachallenge &challenge, int enc);	112	crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc);
59	~crypto_ctx ();	113	~crypto_ctx ();
60	};	114	};
61		115
62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	116	crypto_ctx::crypto_ctx (const auth_data &auth1, const auth_data &auth2, const ecdh_key &a, const ecdh_key &b, int enc)
63	{	117	{
		118	ecdh_key s;
		119
		120	curve25519_combine (a, b, s);
		121
		122	{
		123	u8 mac_key[MAC_KEYSIZE];
		124	static const unsigned char mac_info[] = "gvpe mac key";
		125
		126	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		127	kdf.extract (auth1.rsa.mac_key, sizeof (auth1.rsa.mac_key));
		128	kdf.extract (s, sizeof (s));
		129	kdf.extract_done (HKDF_PRF_HASH ());
		130	kdf.expand (mac_key, sizeof (mac_key), mac_info, sizeof (mac_info));
		131
		132	hctx.init (mac_key, MAC_KEYSIZE, MAC_DIGEST ());
		133	}
		134
		135	{
		136	u8 cipher_key[CIPHER_KEYSIZE];
		137	static const unsigned char cipher_info[] = "gvpe cipher key";
		138
		139	hkdf kdf (auth2.rsa.hkdf_salt, sizeof (auth2.rsa.hkdf_salt), HKDF_XTR_HASH ());
		140	kdf.extract (auth1.rsa.cipher_key, sizeof (auth1.rsa.cipher_key));
		141	kdf.extract (s, sizeof (s));
		142	kdf.extract_done (HKDF_PRF_HASH ());
		143	kdf.expand (cipher_key, sizeof (cipher_key), cipher_info, sizeof (cipher_info));
		144
64	EVP_CIPHER_CTX_init (&cctx);	145	EVP_CIPHER_CTX_init (cctx);
65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	146	require (EVP_CipherInit_ex (cctx, CIPHER (), 0, cipher_key, 0, enc));
66	HMAC_CTX_init (&hctx);	147	}
67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
68	}	148	}
69		149
70	crypto_ctx::~crypto_ctx ()	150	crypto_ctx::~crypto_ctx ()
71	{	151	{
72	require (EVP_CIPHER_CTX_cleanup (&cctx));	152	require (EVP_CIPHER_CTX_cleanup (cctx));
73	HMAC_CTX_cleanup (&hctx);	153	}
		154
		155	static inline void
		156	auth_encrypt (RSA *key, const auth_data &auth, auth_encr &encr)
		157	{
		158	if (RSA_public_encrypt (sizeof (auth.rsa),
		159	(unsigned char )&auth.rsa, (unsigned char )&encr.rsa,
		160	key, RSA_PKCS1_OAEP_PADDING) < 0)
		161	fatal ("RSA_public_encrypt error");
		162
		163	memcpy (&encr.ecdh, &auth.ecdh, sizeof (encr.ecdh));
		164	}
		165
		166	static inline bool
		167	auth_decrypt (RSA *key, const auth_encr &encr, auth_data &auth)
		168	{
		169	u8 rsa_decrypt[RSA_KEYLEN];
		170
		171	if (RSA_private_decrypt (sizeof (encr.rsa),
		172	(const unsigned char )&encr.rsa, (unsigned char )rsa_decrypt,
		173	key, RSA_PKCS1_OAEP_PADDING) != sizeof (auth.rsa))
		174	return 0;
		175
		176	memcpy (&auth.rsa, rsa_decrypt, sizeof (auth.rsa));
		177	memcpy (&auth.ecdh, &encr.ecdh, sizeof (auth.ecdh));
		178
		179	return 1;
74	}	180	}
75		181
76	static void	182	static void
77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, const ecdh_key &b, auth_mac &mac)
78	{	184	{
79	EVP_MD_CTX ctx;	185	hkdf kdf (b, sizeof b, AUTH_DIGEST ()); // use response ecdh b as salt
80		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
81	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
82	require (EVP_DigestInit (&ctx, RSA_HASH));	188	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	}	189	}
88		190
89	struct rsa_entry {	191	void
90	tstamp expire;	192	connection::generate_auth_data ()
91	rsaid id;
92	rsachallenge chg;
93	};
94
95	struct rsa_cache : list<rsa_entry>
96	{	193	{
97	void cleaner_cb (time_watcher &w); time_watcher cleaner;	194	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	{ }	195	{
		196	// request data
		197	rand_fill (snd_auth.rsa);
		198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
138		199
139	} rsa_cache;	200	// eventual response data
140		201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
141	void rsa_cache::cleaner_cb (time_watcher &w)
142	{
143	if (!empty ())
144	{	202	}
145	w.start (NOW + RSA_TTL);
146		203
147	for (iterator i = begin (); i != end (); )	204	// every use prolongs the expiry
148	if (i->expire <= NOW)	205	auth_expire = ev_now () + AUTH_TTL;
149	i = erase (i);
150	else
151	++i;
152	}
153	}	206	}
154		207
155	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
156		209
157	void pkt_queue::put (net_packet *p)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
		211	: max_ttl (max_ttl), max_queue (max_queue)
158	{	212	{
159	if (queue[i])	213	queue = new pkt [max_queue];
160	{
161	delete queue[i];
162	j = (j + 1) % QUEUEDEPTH;
163	}
164		214
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;	215	i = 0;
187	j = 0;	216	j = 0;
		217
		218	expire.set<pkt_queue, &pkt_queue::expire_cb> (this);
188	}	219	}
189		220
190	pkt_queue::~pkt_queue ()	221	pkt_queue::~pkt_queue ()
191	{	222	{
192	for (i = QUEUEDEPTH; --i > 0; )	223	while (net_packet *p = get ())
		224	delete p;
		225
193	delete queue[i];	226	delete [] queue;
194	}	227	}
195		228
		229	void
		230	pkt_queue::expire_cb (ev::timer &w, int revents)
		231	{
		232	ev_tstamp expire = ev_now () - max_ttl;
		233
		234	for (;;)
		235	{
		236	if (empty ())
		237	break;
		238
		239	double diff = queue[j].tstamp - expire;
		240
		241	if (diff >= 0.)
		242	{
		243	w.start (diff > 0.5 ? diff : 0.5);
		244	break;
		245	}
		246
		247	delete get ();
		248	}
		249	}
		250
		251	void
		252	pkt_queue::put (net_packet *p)
		253	{
		254	ev_tstamp now = ev_now ();
		255
		256	// start expiry timer
		257	if (empty ())
		258	expire.start (max_ttl);
		259
		260	int ni = i + 1 == max_queue ? 0 : i + 1;
		261
		262	if (ni == j)
		263	delete get ();
		264
		265	queue[i].pkt = p;
		266	queue[i].tstamp = now;
		267
		268	i = ni;
		269	}
		270
		271	net_packet *
		272	pkt_queue::get ()
		273	{
		274	if (empty ())
		275	return 0;
		276
		277	net_packet *p = queue[j].pkt;
		278	queue[j].pkt = 0;
		279
		280	j = j + 1 == max_queue ? 0 : j + 1;
		281
		282	return p;
		283	}
		284
196	struct net_rateinfo {	285	struct net_rateinfo
		286	{
197	u32 host;	287	u32 host;
198	double pcnt, diff;	288	double pcnt, diff;
199	tstamp last;	289	tstamp last;
200	};	290	};
201		291
211		301
212	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
213	bool can (u32 host);	303	bool can (u32 host);
214	};	304	};
215		305
216	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
217		307
		308	bool
218	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
219	{	310	{
220	iterator i;	311	iterator i;
221		312
222	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
223	if (i->host == host)	314	if (i->host == host)
224	break;	315	break;
225	else if (i->last < NOW - NRL_EXPIRE)	316	else if (i->last < ev_now () - NRL_EXPIRE)
226	i = erase (i);	317	i = erase (i);
227	else	318	else
228	i++;	319	i++;
229		320
230	if (i == end ())	321	if (i == end ())
…		…
232	net_rateinfo ri;	323	net_rateinfo ri;
233		324
234	ri.host = host;	325	ri.host = host;
235	ri.pcnt = 1.;	326	ri.pcnt = 1.;
236	ri.diff = NRL_MAXDIF;	327	ri.diff = NRL_MAXDIF;
237	ri.last = NOW;	328	ri.last = ev_now ();
238		329
239	push_front (ri);	330	push_front (ri);
240		331
241	return true;	332	return true;
242	}	333	}
…		…
244	{	335	{
245	net_rateinfo ri (*i);	336	net_rateinfo ri (*i);
246	erase (i);	337	erase (i);
247		338
248	ri.pcnt = ri.pcnt * NRL_ALPHA;	339	ri.pcnt = ri.pcnt * NRL_ALPHA;
249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);	340	ri.diff = ri.diff * NRL_ALPHA + (ev_now () - ri.last);
250		341
251	ri.last = NOW;	342	ri.last = ev_now ();
252		343
253	double dif = ri.diff / ri.pcnt;	344	double dif = ri.diff / ri.pcnt;
254		345
255	bool send = dif > NRL_CUTOFF;	346	bool send = dif > NRL_CUTOFF;
256		347
…		…
268	}	359	}
269	}	360	}
270		361
271	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
272		363
273	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
274
275	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
276	{	366	{
277	unsigned int xlen;	367	ctx->hctx.init ();
278		368	ctx->hctx.add (((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet));
279	HMAC_CTX *hctx = &ctx->hctx;	369	ctx->hctx.digest (hmac_digest);
280
281	HMAC_Init_ex (hctx, 0, 0, 0, 0);
282	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
283	len - sizeof (hmac_packet));
284	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
285	}	370	}
286		371
287	void	372	void
288	hmac_packet::hmac_set (crypto_ctx *ctx)	373	hmac_packet::hmac_set (crypto_ctx *ctx)
289	{	374	{
290	hmac_gen (ctx);	375	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
291		376	hmac_gen (ctx, hmac_digest);
292	memcpy (hmac, hmac_digest, HMACLENGTH);	377	memcpy (hmac, hmac_digest, HMACLENGTH);
293	}	378	}
294		379
295	bool	380	bool
296	hmac_packet::hmac_chk (crypto_ctx *ctx)	381	hmac_packet::hmac_chk (crypto_ctx *ctx)
297	{	382	{
298	hmac_gen (ctx);	383	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
299		384	hmac_gen (ctx, hmac_digest);
300	return !memcmp (hmac, hmac_digest, HMACLENGTH);	385	return slow_memeq (hmac, hmac_digest, HMACLENGTH);
301	}	386	}
302		387
		388	void
303	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	389	vpn_packet::set_hdr (ptype type_, unsigned int dst)
304	{	390	{
305	type = type_;	391	type = type_;
306		392
307	int src = THISNODE->id;	393	int src = THISNODE->id;
308		394
…		…
310	srcdst = ((src >> 8) << 4) \| (dst >> 8);	396	srcdst = ((src >> 8) << 4) \| (dst >> 8);
311	dst1 = dst;	397	dst1 = dst;
312	}	398	}
313		399
314	#define MAXVPNDATA (MAX_MTU - 6 - 6)	400	#define MAXVPNDATA (MAX_MTU - 6 - 6)
315	#define DATAHDR (sizeof (u32) + RAND_SIZE)
316		401
317	struct vpndata_packet : vpn_packet	402	struct vpndata_packet : vpn_packet
		403	{
		404	u32 ctr; // seqno
		405	u8 data[MAXVPNDATA];
		406
		407	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		408	tap_packet unpack (connection conn, u32 &seqno);
		409
		410	private:
		411	const u32 data_hdr_size () const
318	{	412	{
319	u8 data[MAXVPNDATA + DATAHDR]; // seqno	413	// the distance from beginning of packet to data member
320		414	return data - at (0);
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;
328	}
329	};	415	}
		416	};
		417
		418	// expands packet counter (unlike seqno, in network byte order) to counter mode IV
		419	static unsigned char *
		420	expand_iv (u32 ctr)
		421	{
		422	static u32 iv[IV_SIZE (CIPHER) / 4];
		423
		424	require (sizeof (iv) == 4 * 4);
		425	require (IV_SIZE (CIPHER) % 4 == 0);
		426
		427	iv[0] =
		428	iv[1] =
		429	iv[2] = ctr;
		430
		431	// I would reuse ctr here to to avoid potential endianness issues,
		432	// but it seems openssl wraps around. While this would be still ok,
		433	// and I don't even know if its true, let's play safe and initialise
		434	// to 0.
		435	iv[3] = 0;
		436
		437	return (unsigned char *)iv;
		438	}
330		439
331	void	440	void
332	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	441	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
333	{	442	{
334	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	443	EVP_CIPHER_CTX *cctx = conn->octx->cctx;
335	int outl = 0, outl2;	444	int outl = 0, outl2;
336	ptype type = PT_DATA_UNCOMPRESSED;	445	ptype type = PT_DATA_UNCOMPRESSED;
337		446
338	#if ENABLE_COMPRESSION	447	#if ENABLE_COMPRESSION
339	u8 cdata[MAX_MTU];	448	u8 cdata[MAX_MTU];
340		449
341	if (conn->features & ENABLE_COMPRESSION)	450	if (conn->features & FEATURE_COMPRESSION)
342	{	451	{
		452	static LZF_STATE lzf_state;
343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	453	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7, lzf_state);
344		454
345	if (cl)	455	if (cl)
346	{	456	{
347	type = PT_DATA_COMPRESSED;	457	type = PT_DATA_COMPRESSED;
348	d = cdata;	458	d = cdata;
…		…
352	d[1] = cl;	462	d[1] = cl;
353	}	463	}
354	}	464	}
355	#endif	465	#endif
356		466
		467	ctr = htonl (seqno);
		468
357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	469	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
358
359	struct {
360	#if RAND_SIZE
361	u8 rnd[RAND_SIZE];
362	#endif
363	u32 seqno;
364	} datahdr;
365
366	datahdr.seqno = ntohl (seqno);
367	#if RAND_SIZE
368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
369	#endif
370		470
371	require (EVP_EncryptUpdate (cctx,	471	require (EVP_EncryptUpdate (cctx,
372	(unsigned char *) data + outl, &outl2,	472	(unsigned char *)data + outl, &outl2,
373	(unsigned char *) &datahdr, DATAHDR));	473	(unsigned char *)d, l));
374	outl += outl2;	474	outl += outl2;
375		475
376	require (EVP_EncryptUpdate (cctx,	476	// it seems this is a nop for us, but we do it anyways
377	(unsigned char *) data + outl, &outl2,	477	require (EVP_EncryptFinal_ex (cctx, (unsigned char *)data + outl, &outl2));
378	(unsigned char *) d, l));
379	outl += outl2;	478	outl += outl2;
380		479
381	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
382	outl += outl2;
383
384	len = outl + data_hdr_size ();	480	len = data_hdr_size () + outl;
385		481
386	set_hdr (type, dst);	482	set_hdr (type, dst);
387		483
388	hmac_set (conn->octx);	484	hmac_set (conn->octx);
389	}	485	}
390		486
391	tap_packet *	487	tap_packet *
392	vpndata_packet::unpack (connection *conn, u32 &seqno)	488	vpndata_packet::unpack (connection *conn, u32 &seqno)
393	{	489	{
394	EVP_CIPHER_CTX *cctx = &conn->ictx->cctx;	490	EVP_CIPHER_CTX *cctx = conn->ictx->cctx;
395	int outl = 0, outl2;	491	int outl = 0, outl2;
396	tap_packet *p = new tap_packet;	492	tap_packet *p = new tap_packet;
397	u8 *d;	493	u8 *d;
398	u32 l = len - data_hdr_size ();
399		494
		495	seqno = ntohl (ctr);
		496
400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	497	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, expand_iv (ctr)));
401		498
402	#if ENABLE_COMPRESSION	499	#if ENABLE_COMPRESSION
403	u8 cdata[MAX_MTU];	500	u8 cdata[MAX_MTU];
404		501
405	if (type == PT_DATA_COMPRESSED)	502	if (type == PT_DATA_COMPRESSED)
406	d = cdata;	503	d = cdata;
407	else	504	else
408	#endif	505	#endif
409	d = &(*p)[6 + 6 - DATAHDR];	506	d = &(*p)[6 + 6];
410		507
411	/* this overwrites part of the src mac, but we fix that later */	508	// this can overwrite the len/dst/src fields
412	require (EVP_DecryptUpdate (cctx,	509	require (EVP_DecryptUpdate (cctx,
413	d, &outl2,	510	d, &outl2,
414	(unsigned char *)&data, len - data_hdr_size ()));	511	(unsigned char *)&data, len - data_hdr_size ()));
415	outl += outl2;	512	outl += outl2;
416		513
		514	// it seems this is a nop for us, but we do it anyways
417	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));	515	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
418	outl += outl2;	516	outl += outl2;
419		517
420	seqno = ntohl ((u32 )(d + RAND_SIZE));
421
422	id2mac (dst () ? dst() : THISNODE->id, p->dst);	518	id2mac (dst () ? dst() : THISNODE->id, p->dst);
423	id2mac (src (), p->src);	519	id2mac (src (), p->src);
424		520
425	#if ENABLE_COMPRESSION	521	#if ENABLE_COMPRESSION
426	if (type == PT_DATA_COMPRESSED)	522	if (type == PT_DATA_COMPRESSED)
427	{	523	{
428	u32 cl = (d[DATAHDR] << 8) \| d[DATAHDR + 1];	524	u32 cl = (d[0] << 8) \| d[1];
429		525
430	p->len = lzf_decompress (d + DATAHDR + 2, cl < MAX_MTU ? cl : 0,	526	p->len = lzf_decompress (d + 2, cl < MAX_MTU - 2 ? cl : 0,
431	&(*p)[6 + 6], MAX_MTU)	527	&(*p)[6 + 6], MAX_MTU)
432	+ 6 + 6;	528	+ 6 + 6;
433	}	529	}
434	else	530	else
435	p->len = outl + (6 + 6 - DATAHDR);	531	p->len = outl + (6 + 6);
436	#endif	532	#endif
437		533
438	return p;	534	return p;
439	}	535	}
440		536
…		…
447	}	543	}
448	};	544	};
449		545
450	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
451	{	547	{
452	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
456	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
457	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
458		552
459	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
460	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
461		555
462	static u8 get_features ()	556	static u8 get_features ()
463	{	557	{
464	u8 f = 0;	558	u8 f = 0;
465	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
466	f \|= FEATURE_COMPRESSION;	560	f \|= FEATURE_COMPRESSION;
467	#endif	561	#endif
468	#if ENABLE_ROHC	562	#if ENABLE_ROHC
469	f \|= FEATURE_ROHC;	563	f \|= FEATURE_ROHC;
470	#endif	564	#endif
		565	#if ENABLE_BRIDGING
		566	f \|= FEATURE_BRIDGING;
		567	#endif
471	return f;	568	return f;
472	}	569	}
473	};	570	};
474		571
		572	void
475	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
476	{	574	{
477	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
478	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
479	randsize = RAND_SIZE;	577	flags = 0;
480	hmaclen = HMACLENGTH;
481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
482	challengelen = sizeof (rsachallenge);
483	features = get_features ();	578	features = get_features ();
484		579
		580	strncpy ((char *)serial, conf.serial, sizeof (serial));
		581
485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	582	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
487	hmac_nid = htonl (EVP_MD_type (DIGEST));	583	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		584	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
488		585
489	len = sizeof (*this) - sizeof (net_packet);	586	len = sizeof (*this) - sizeof (net_packet);
490	set_hdr (type, dst);	587	set_hdr (type, dst);
491	}	588	}
492		589
493	bool config_packet::chk_config () const	590	bool
		591	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
494	{	592	{
495	if (prot_major != PROTOCOL_MAJOR)	593	if (prot_major != PROTOCOL_MAJOR)
496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	594	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
497	else if (randsize != RAND_SIZE)	595	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
499	else if (hmaclen != HMACLENGTH)
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)))	596	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));	597	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	598	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)))	599	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));	600	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		601	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		602	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		603	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		604	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
513	else	605	else
		606	{
		607	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		608
		609	if (cmp > 0)
		610	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		611	conf->nodename, (const char *)rsi);
		612	else if (cmp == 0)
514	return true;	613	return true;
		614	}
515		615
516	return false;	616	return false;
517	}	617	}
518		618
519	struct auth_req_packet : config_packet	619	struct auth_req_packet : config_packet // UNPROTECTED
520	{	620	{
521	char magic[8];	621	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	622	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will be patched on forward)	623	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	624	u8 pad2, pad3;
525	rsaid id;	625	auth_encr encr;
526	rsaencrdata encr;
527		626
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	627	auth_req_packet (int dst, bool initiate_, u8 protocols_)
529	{	628	{
530	config_packet::setup (PT_AUTH_REQ, dst);	629	config_packet::setup (PT_AUTH_REQ, dst);
531	strncpy (magic, MAGIC, 8);	630	memcpy (magic, MAGIC, 8);
532	initiate = !!initiate_;	631	initiate = !!initiate_;
533	protocols = protocols_;	632	protocols = protocols_;
534		633
535	len = sizeof (*this) - sizeof (net_packet);	634	len = sizeof (*this) - sizeof (net_packet);
536	}	635	}
537	};	636	};
538		637
539	struct auth_res_packet : config_packet	638	struct auth_res_packet : vpn_packet // UNPROTECTED
540	{	639	{
541	rsaid id;
542	u8 pad1, pad2, pad3;
543	u8 response_len; // encrypted length
544	rsaresponse response;	640	auth_response response;
545		641
546	auth_res_packet (int dst)	642	auth_res_packet (int dst)
547	{	643	{
548	config_packet::setup (PT_AUTH_RES, dst);	644	set_hdr (PT_AUTH_RES, dst);
549		645
550	len = sizeof (*this) - sizeof (net_packet);	646	len = sizeof (*this) - sizeof (net_packet);
551	}	647	}
552	};	648	};
553		649
…		…
583	};	679	};
584		680
585	/////////////////////////////////////////////////////////////////////////////	681	/////////////////////////////////////////////////////////////////////////////
586		682
587	void	683	void
588	connection::connection_established ()	684	connection::connection_established (const sockinfo &rsi)
589	{	685	{
590	if (ictx && octx)	686	if (!have_snd_auth \|\| !have_rcv_auth)
		687	return;
		688
		689	si = rsi;
		690	protocol = rsi.prot;
		691
		692	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		693	conf->nodename, (const char *)rsi,
		694	vpn->can_direct (THISNODE, conf) ? "direct" : "forwarded",
		695	PROTOCOL_MAJOR, prot_minor);
		696
		697	if (::conf.script_node_up)
		698	{
		699	run_script_cb *cb = new run_script_cb;
		700	cb->set<connection, &connection::script_node_up> (this);
		701	run_script_queued (cb, _("node-up command execution failed, continuing."));
591	{	702	}
592	connectmode = conf->connectmode;	703
		704	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		705	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
593		706
		707	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		708	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		709
594	// make sure rekeying timeouts are slightly asymmetric	710	// make sure rekeying timeouts are slightly asymmetric
595	rekey.start (NOW + ::conf.rekey	711	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
596	+ (conf->id > THISNODE->id ? 10 : 0));	712	rekey.start (rekey_interval, rekey_interval);
		713
		714	hmac_error = 0.;
		715
597	keepalive.start (NOW + ::conf.keepalive);	716	keepalive.start (::conf.keepalive);
598		717
599	// send queued packets	718	// send queued packets
600	if (ictx && octx)
601	{
602	while (tap_packet p = (tap_packet )data_queue.get ())	719	while (tap_packet p = (tap_packet )data_queue.get ())
603	{	720	{
604	send_data_packet (p);	721	if (p->len) send_data_packet (p);
605	delete p;	722	delete p;
606	}	723	}
607		724
608	while (vpn_packet p = (vpn_packet )vpn_queue.get ())	725	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
609	{	726	{
610	send_vpn_packet (p, si, IPTOS_RELIABILITY);	727	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
611	delete p;	728	delete p;
612	}
613	}
614	}	729	}
		730
		731	vpn->connection_established (this);
		732	}
		733
		734	void
		735	connection::reset_si ()
		736	{
		737	if (vpn->can_direct (THISNODE, conf))
		738	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
615	else	739	else
616	{	740	{
617	retry_cnt = 0;	741	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
618	establish_connection.start (NOW + 5);	742	protocol = 0;
619	keepalive.stop ();
620	rekey.stop ();
621	}	743	}
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		744
634	si.set (conf, protocol);	745	si.set (conf, protocol);
635	}	746	}
636		747
637	// ensure sockinfo is valid, forward if necessary	748	// ensure sockinfo is valid, forward if necessary
638	const sockinfo &	749	const sockinfo &
639	connection::forward_si (const sockinfo &si) const	750	connection::forward_si (const sockinfo &si) const
640	{	751	{
641	if (!si.valid ())	752	if (!si.valid ())
642	{	753	{
643	connection *r = vpn->find_router ();	754	connection *r = vpn->find_router_for (this);
644		755
645	if (r)	756	if (r)
646	{	757	{
647	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	758	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
648	conf->nodename, r->conf->nodename);	759	conf->nodename, r->conf->nodename);
649	return r->si;	760	return r->si;
650	}	761	}
651	else	762	else
652	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	763	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
653	conf->nodename);	764	conf->nodename);
654	}	765	}
655		766
656	return si;	767	return si;
657	}	768	}
658		769
659	void	770	void
660	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	771	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
661	{	772	{
662	bool ok;	773	if (!vpn->send_vpn_packet (pkt, si, tos))
663		774	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	}	775	}
691		776
692	void	777	void
693	connection::send_ping (const sockinfo &si, u8 pong)	778	connection::send_ping (const sockinfo &si, u8 pong)
694	{	779	{
695	ping_packet *pkt = new ping_packet;	780	ping_packet *pkt = new ping_packet;
696		781
697	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	782	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		783
		784	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
698	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	785	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
699		786
700	delete pkt;	787	delete pkt;
701	}	788	}
702		789
…		…
717	void	804	void
718	connection::send_auth_request (const sockinfo &si, bool initiate)	805	connection::send_auth_request (const sockinfo &si, bool initiate)
719	{	806	{
720	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	807	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
721		808
722	rsachallenge chg;	809	generate_auth_data ();
723	rsa_cache.gen (pkt->id, chg);
724	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	810	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
725		811
726	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	812	slog (L_TRACE, "%s << PT_AUTH_REQ [%s]", conf->nodename, (const char *)si);
727
728	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	813	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
729		814
730	delete pkt;	815	delete pkt;
731	}	816	}
732		817
733	void	818	void
734	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	819	connection::send_auth_response (const sockinfo &si)
735	{	820	{
736	auth_res_packet *pkt = new auth_res_packet (conf->id);	821	auth_res_packet *pkt = new auth_res_packet (conf->id);
737		822
738	pkt->id = id;	823	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		824	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
739		825
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);	826	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	827	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
747		828
748	delete pkt;	829	delete pkt;
749	}	830	}
750		831
751	void	832	void
752	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	833	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
753	{	834	{
754	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n",	835	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
755	conf->id, rid, (const char *)rsi);	836	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		837	conf->protocols);
756		838
757	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	839	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
758		840
759	r->hmac_set (octx);	841	r->hmac_set (octx);
760	send_vpn_packet (r, si);	842	send_vpn_packet (r, si);
761		843
762	delete r;	844	delete r;
763	}	845	}
764		846
765	void	847	inline void
766	connection::establish_connection_cb (time_watcher &w)	848	connection::establish_connection_cb (ev::timer &w, int revents)
767	{	849	{
768	if (!ictx	850	if (!(ictx && octx)
769	&& conf != THISNODE	851	&& conf != THISNODE
770	&& connectmode != conf_node::C_NEVER	852	&& connectmode != conf_node::C_NEVER
771	&& connectmode != conf_node::C_DISABLED	853	&& connectmode != conf_node::C_DISABLED
772	&& NOW > w.at)	854	&& !w.is_active ())
773	{	855	{
774	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	856	// a bit hacky, if ondemand, and packets are no longer queued, then reset the connection
775		857	// and stop trying. should probably be handled by a per-connection expire handler.
776	if (retry_int < conf->max_retry)	858	if (connectmode == conf_node::C_ONDEMAND && vpn_queue.empty () && data_queue.empty ())
		859	{
		860	reset_connection ("no demand");
777	retry_cnt++;	861	return;
778	else	862	}
779	retry_int = conf->max_retry;
780		863
781	w.start (NOW + retry_int);	864	last_establish_attempt = ev_now ();
		865
		866	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
		867	? (retry_cnt & 3) + 1
		868	: 1 << (retry_cnt >> 2));
782		869
783	reset_si ();	870	reset_si ();
784		871
785	if (si.prot && !si.host)	872	bool slow = (si.prot & PROT_SLOW) \|\| (conf->low_power \|\| THISNODE->low_power);
		873
		874	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
		875	{
		876	/TODO/ /* start the timer so we don't recurse endlessly */
		877	w.start (1);
786	vpn->send_connect_request (conf->id);	878	vpn->send_connect_request (this);
		879	}
787	else	880	else
788	{	881	{
		882	if (si.valid ())
		883	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		884	conf->nodename, (const char *)si);
		885
789	const sockinfo &dsi = forward_si (si);	886	const sockinfo &dsi = forward_si (si);
		887
		888	slow = slow \|\| (dsi.prot & PROT_SLOW);
790		889
791	if (dsi.valid () && auth_rate_limiter.can (dsi))	890	if (dsi.valid () && auth_rate_limiter.can (dsi))
792	{	891	{
793	if (retry_cnt < 4)	892	// use ping after the first few retries
		893	// TODO: on rekeys, the other node might not interpret ping correctly,
		894	// TODO: as it will still have a valid connection
		895	if (retry_cnt < 4 && (!conf->low_power \|\| THISNODE->low_power))
794	send_auth_request (dsi, true);	896	send_auth_request (dsi, true);
795	else	897	else
796	send_ping (dsi, 0);	898	send_ping (dsi, 0);
797	}	899	}
798	}	900	}
799	}
800	}
801		901
		902	retry_int *= slow ? 4. : 0.9;
		903
		904	if (retry_int < conf->max_retry)
		905	retry_cnt++;
		906	else
		907	retry_int = conf->max_retry;
		908
		909	w.start (retry_int);
		910	}
		911	}
		912
802	void	913	void
803	connection::reset_connection ()	914	connection::reset_connection (const char *reason)
804	{	915	{
805	if (ictx && octx)	916	if (ictx && octx)
806	{	917	{
807	slog (L_INFO, _("%s(%s): connection lost"),	918	slog (L_INFO, _("%s(%s): connection lost (%s)"),
808	conf->nodename, (const char *)si);	919	conf->nodename, (const char *)si, reason);
809		920
810	if (::conf.script_node_down)	921	if (::conf.script_node_down)
811	run_script (run_script_cb (this, &connection::script_node_down), false);	922	{
		923	run_script_cb *cb = new run_script_cb;
		924	cb->set<connection, &connection::script_node_down> (this);
		925	run_script_queued (cb, _("node-down command execution failed, continuing."));
		926	}
812	}	927	}
813		928
814	delete ictx; ictx = 0;	929	delete ictx; ictx = 0;
815	delete octx; octx = 0;	930	delete octx; octx = 0;
816		931
817	si.host = 0;	932	si.host = 0;
818		933
		934	have_snd_auth = false;
		935	have_rcv_auth = false;
		936	auth_expire = 0.;
		937
819	last_activity = 0;	938	last_activity = 0.;
		939	//last_si_change = 0.;
820	retry_cnt = 0;	940	retry_cnt = 0;
821		941
822	rekey.stop ();	942	rekey.stop ();
823	keepalive.stop ();	943	keepalive.stop ();
824	establish_connection.stop ();	944	establish_connection.stop ();
…		…
828	connection::shutdown ()	948	connection::shutdown ()
829	{	949	{
830	if (ictx && octx)	950	if (ictx && octx)
831	send_reset (si);	951	send_reset (si);
832		952
833	reset_connection ();	953	reset_connection ("shutdown");
834	}	954	}
835		955
836	void	956	// poor-man's rekeying
837	connection::rekey_cb (time_watcher &w)	957	inline void
		958	connection::rekey_cb (ev::timer &w, int revents)
838	{	959	{
839	reset_connection ();	960	reset_connection ("rekeying");
840	establish_connection ();	961	establish_connection ();
841	}	962	}
842		963
843	void	964	void
844	connection::send_data_packet (tap_packet *pkt)	965	connection::send_data_packet (tap_packet *pkt)
…		…
858	if (oseqno > MAX_SEQNO)	979	if (oseqno > MAX_SEQNO)
859	rekey ();	980	rekey ();
860	}	981	}
861		982
862	void	983	void
		984	connection::post_inject_queue ()
		985	{
		986	// force a connection every now and when when packets are sent (max 1/s)
		987	if (ev_now () - last_establish_attempt >= (conf->low_power \|\| THISNODE->low_power ? 2.95 : 0.95)) // arbitrary
		988	establish_connection.stop ();
		989
		990	establish_connection ();
		991	}
		992
		993	void
863	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	994	connection::inject_data_packet (tap_packet *pkt)
864	{	995	{
865	if (ictx && octx)	996	if (ictx && octx)
866	send_data_packet (pkt);	997	send_data_packet (pkt);
867	else	998	else
868	{	999	{
869	if (!broadcast)//DDDD
870	data_queue.put (new tap_packet (*pkt));	1000	data_queue.put (new tap_packet (*pkt));
871		1001	post_inject_queue ();
872	establish_connection ();
873	}	1002	}
874	}	1003	}
875		1004
		1005	void
876	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1006	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
877	{	1007	{
878	if (ictx && octx)	1008	if (ictx && octx)
879	send_vpn_packet (pkt, si, tos);	1009	send_vpn_packet (pkt, si, tos);
880	else	1010	else
881	{	1011	{
882	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1012	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
883		1013	post_inject_queue ();
884	establish_connection ();
885	}	1014	}
886	}	1015	}
887		1016
888	void	1017	void
889	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1018	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
890	{	1019	{
891	last_activity = NOW;	1020	last_activity = ev_now ();
892		1021
893	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1022	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
894	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1023	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
		1024
		1025	if (connectmode == conf_node::C_DISABLED)
		1026	return;
895		1027
896	switch (pkt->typ ())	1028	switch (pkt->typ ())
897	{	1029	{
898	case vpn_packet::PT_PING:	1030	case vpn_packet::PT_PING:
		1031	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1032
899	// we send pings instead of auth packets after some retries,	1033	// we send pings instead of auth packets after some retries,
900	// so reset the retry counter and establish a connection	1034	// so reset the retry counter and establish a connection
901	// when we receive a ping.	1035	// when we receive a ping.
902	if (!ictx)	1036	if (!ictx)
903	{	1037	{
904	if (auth_rate_limiter.can (rsi))	1038	if (auth_rate_limiter.can (rsi))
905	send_auth_request (rsi, true);	1039	send_auth_request (rsi, true);
906	}	1040	}
907	else	1041	else
		1042	// we would love to change the socket address here, but ping's aren't
		1043	// authenticated, so we best ignore it.
908	send_ping (rsi, 1); // pong	1044	send_ping (rsi, 1); // pong
909		1045
910	break;	1046	break;
911		1047
912	case vpn_packet::PT_PONG:	1048	case vpn_packet::PT_PONG:
		1049	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1050
		1051	// a PONG might mean that the other side doesn't really know
		1052	// about our desire for communication.
		1053	establish_connection ();
913	break;	1054	break;
914		1055
915	case vpn_packet::PT_RESET:	1056	case vpn_packet::PT_RESET:
		1057	slog (L_TRACE, "%s >> PT_RESET", conf->nodename);
		1058
		1059	if (ictx && octx)
916	{	1060	{
917	reset_connection ();	1061	reset_connection ("remote reset");
918		1062
919	config_packet p = (config_packet ) pkt;	1063	config_packet p = (config_packet ) pkt;
920		1064
921	if (!p->chk_config ())	1065	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 ();	1066	establish_connection ();
929	}	1067	}
		1068
930	break;	1069	break;
931		1070
932	case vpn_packet::PT_AUTH_REQ:	1071	case vpn_packet::PT_AUTH_REQ:
933	if (auth_rate_limiter.can (rsi))	1072	if (auth_rate_limiter.can (rsi))
934	{	1073	{
935	auth_req_packet p = (auth_req_packet ) pkt;	1074	auth_req_packet p = (auth_req_packet )pkt;
936		1075
937	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1076	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1077	conf->nodename, p->initiate ? "initiate" : "reply",
		1078	p->protocols, p->features);
938		1079
939	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1080	if (memcmp (p->magic, MAGIC, 8))
		1081	{
		1082	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1083	conf->nodename, (const char *)rsi);
		1084	}
		1085	else if (p->chk_config (conf, rsi))
940	{	1086	{
941	if (p->prot_minor != PROTOCOL_MINOR)	1087	if (p->prot_minor != PROTOCOL_MINOR)
942	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1088	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
943	conf->nodename, (const char *)rsi,	1089	conf->nodename, (const char *)rsi,
944	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1090	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
945		1091
946	if (p->initiate)	1092	if (p->initiate)
		1093	{
947	send_auth_request (rsi, false);	1094	send_auth_request (rsi, false);
948		1095
949	rsachallenge k;	1096	if (ictx && octx)
		1097	reset_connection ("reconnect");
		1098	}
950		1099
		1100	auth_data auth;
		1101
951	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1102	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
952	{	1103	{
953	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1104	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
954	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1105	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
955	break;
956	}	1106	}
957	else	1107	else
958	{	1108	{
959	delete octx;	1109	bool chg = !have_rcv_auth \|\| !slow_memeq (&rcv_auth, &auth, sizeof auth);
960		1110
961	octx = new crypto_ctx (k, 1);	1111	rcv_auth = auth;
962	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1112	have_rcv_auth = true;
963		1113
964	// compatibility code, remove when no longer required	1114	send_auth_response (rsi);
965	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
966		1115
		1116	if (chg)
		1117	{
967	conf->protocols = p->protocols;	1118	conf->protocols = p->protocols;
968	features = p->features & config_packet::get_features ();	1119	features = p->features & config_packet::get_features ();
969		1120
970	send_auth_response (rsi, p->id, k);
971
972	connection_established ();	1121	connection_established (rsi);
973
974	break;	1122	}
975	}	1123	}
		1124
		1125	break;
976	}	1126	}
977	else
978	slog (L_WARN, _("%s(%s): protocol mismatch"),
979	conf->nodename, (const char *)rsi);
980		1127
981	send_reset (rsi);	1128	send_reset (rsi);
982	}	1129	}
983		1130
984	break;	1131	break;
985		1132
986	case vpn_packet::PT_AUTH_RES:	1133	case vpn_packet::PT_AUTH_RES:
987	{	1134	{
988	auth_res_packet p = (auth_res_packet ) pkt;	1135	auth_res_packet p = (auth_res_packet )pkt;
989		1136
990	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1137	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
991		1138
992	if (p->chk_config ())	1139	auth_mac local_mac;
		1140	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1141
		1142	if (!slow_memeq (&p->response.mac, local_mac, sizeof local_mac))
993	{	1143	{
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"),	1144	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1004	conf->nodename, (const char *)rsi);	1145	conf->nodename, (const char *)rsi);
1005	break;
1006	}	1146	}
1007	else	1147	else if (!have_snd_auth)
1008	{	1148	{
1009	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1149	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
1010		1150
1011	if (!p->hmac_chk (cctx))	1151	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 ();	1152	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	}	1153	}
1054	}	1154	}
1055
1056	send_reset (rsi);
1057	break;	1155	break;
1058		1156
1059	case vpn_packet::PT_DATA_COMPRESSED:	1157	case vpn_packet::PT_DATA_COMPRESSED:
1060	#if !ENABLE_COMPRESSION	1158	#if !ENABLE_COMPRESSION
1061	send_reset (rsi);	1159	send_reset (rsi);
…		…
1067	if (ictx && octx)	1165	if (ictx && octx)
1068	{	1166	{
1069	vpndata_packet p = (vpndata_packet )pkt;	1167	vpndata_packet p = (vpndata_packet )pkt;
1070		1168
1071	if (!p->hmac_chk (ictx))	1169	if (!p->hmac_chk (ictx))
		1170	{
		1171	// rekeying often creates temporary hmac auth floods
		1172	// we assume they don't take longer than a few seconds normally,
		1173	// and suppress messages and resets during that time.
		1174	//TODO: should be done per source address
		1175	if (!hmac_error)
		1176	{
		1177	hmac_error = ev_now () + 3;
		1178	break;
		1179	}
		1180	else if (hmac_error >= ev_now ())
		1181	break; // silently suppress
		1182	else
		1183	{
1072	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1184	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1073	"could be an attack, or just corruption or a synchronization error"),	1185	"could be an attack, or just corruption or a synchronization error."),
1074	conf->nodename, (const char *)rsi);	1186	conf->nodename, (const char *)rsi);
		1187	// reset
		1188	}
		1189	}
1075	else	1190	else
1076	{	1191	{
1077	u32 seqno;	1192	u32 seqno;
1078	tap_packet *d = p->unpack (this, seqno);	1193	tap_packet *d = p->unpack (this, seqno);
		1194	int seqclass = iseqno.seqno_classify (seqno);
1079		1195
1080	if (iseqno.recv_ok (seqno))	1196	hmac_error = 0;
		1197
		1198	if (seqclass == 0) // ok
1081	{	1199	{
1082	vpn->tap->send (d);	1200	vpn->tap->send (d);
1083		1201
1084	if (si != rsi)	1202	if (si != rsi)
1085	{	1203	{
1086	// fast re-sync on connection changes, useful especially for tcp/ip	1204	// fast re-sync on source address changes, useful especially for tcp/ip
		1205	//if (last_si_change < ev_now () + 5.)
1087	si = rsi;	1206	// {
1088
1089	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1207	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1090	conf->nodename, (const char )si, (const char )rsi);	1208	conf->nodename, (const char )si, (const char )rsi);
		1209
		1210	si = rsi;
		1211
		1212	if (::conf.script_node_change)
		1213	{
		1214	run_script_cb *cb = new run_script_cb;
		1215	cb->set<connection, &connection::script_node_change> (this);
		1216	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1217	}
		1218
		1219	// }
		1220	//else
		1221	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1222	// conf->nodename, (const char )si, (const char )rsi);
1091	}	1223	}
		1224	}
		1225	else if (seqclass == 1) // far history
		1226	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1227	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1228	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1229	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1230	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1231	else if (seqclass == 3) // reset
		1232	{
		1233	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1234	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1235	send_reset (rsi);
1092	}	1236	}
1093		1237
1094	delete d;	1238	delete d;
1095	break;	1239	break;
1096	}	1240	}
…		…
1100	break;	1244	break;
1101		1245
1102	case vpn_packet::PT_CONNECT_REQ:	1246	case vpn_packet::PT_CONNECT_REQ:
1103	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1247	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1104	{	1248	{
1105	connect_req_packet p = (connect_req_packet ) pkt;	1249	connect_req_packet p = (connect_req_packet )pkt;
1106		1250
1107	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1251	if (p->id > 0 && p->id <= vpn->conns.size ())
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	{	1252	{
		1253	connection *c = vpn->conns[p->id - 1];
		1254	conf->protocols = p->protocols;
		1255
		1256	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1257	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1258	p->protocols,
		1259	c->ictx && c->octx);
		1260
		1261	if (c->ictx && c->octx)
		1262	{
1116	// send connect_info packets to both sides, in case one is	1263	// send connect_info packets to both sides, in case one is
1117	// behind a nat firewall (or both ;)	1264	// behind a nat firewall (or both ;)
1118	c->send_connect_info (conf->id, si, conf->protocols);	1265	c->send_connect_info (conf->id, si, conf->protocols);
1119	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1266	send_connect_info (c->conf->id, c->si, c->conf->protocols);
		1267	}
		1268	else
		1269	c->establish_connection ();
1120	}	1270	}
1121	else	1271	else
1122	c->establish_connection ();	1272	slog (L_WARN,
		1273	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1274	p->id);
1123	}	1275	}
1124		1276
1125	break;	1277	break;
1126		1278
1127	case vpn_packet::PT_CONNECT_INFO:	1279	case vpn_packet::PT_CONNECT_INFO:
1128	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1280	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1129	{	1281	{
1130	connect_info_packet p = (connect_info_packet )pkt;	1282	connect_info_packet p = (connect_info_packet )pkt;
1131		1283
1132	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything	1284	if (p->id > 0 && p->id <= vpn->conns.size ())
1133	{	1285	{
1134	connection *c = vpn->conns[p->id - 1];	1286	connection *c = vpn->conns[p->id - 1];
1135		1287
1136	c->conf->protocols = p->protocols;	1288	c->conf->protocols = p->protocols;
1137	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1289	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1138	p->si.upgrade_protocol (protocol, c->conf);	1290	p->si.upgrade_protocol (protocol, c->conf);
1139		1291
1140	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1292	slog (L_TRACE, "%s >> PT_CONNECT_INFO(%s,%s,protocols=%02x,protocol=%02x,upgradable=%02x) [%d]",
1141	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1293	conf->nodename,
		1294	vpn->conns[p->id - 1]->conf->nodename,
		1295	(const char *)p->si,
		1296	p->protocols,
		1297	protocol,
		1298	p->si.supported_protocols (c->conf),
		1299	!c->ictx && !c->octx);
1142		1300
1143	const sockinfo &dsi = forward_si (p->si);	1301	const sockinfo &dsi = forward_si (p->si);
1144		1302
1145	if (dsi.valid ())	1303	if (dsi.valid ())
1146	c->send_auth_request (dsi, true);	1304	c->send_auth_request (dsi, true);
		1305	else
		1306	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1307	vpn->conns[p->id - 1]->conf->nodename,
		1308	(const char *)p->si);
1147	}	1309	}
		1310	else
		1311	slog (L_WARN,
		1312	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
		1313	p->id);
1148	}	1314	}
1149		1315
1150	break;	1316	break;
1151		1317
1152	default:	1318	default:
1153	send_reset (rsi);	1319	send_reset (rsi);
1154	break;	1320	break;
1155	}	1321	}
1156	}	1322	}
1157		1323
1158	void connection::keepalive_cb (time_watcher &w)	1324	inline void
		1325	connection::keepalive_cb (ev::timer &w, int revents)
1159	{	1326	{
1160	if (NOW >= last_activity + ::conf.keepalive + 30)	1327	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1328
		1329	if (when >= 0)
		1330	w.start (when);
		1331	else if (when < -15)
1161	{	1332	{
1162	reset_connection ();	1333	reset_connection ("keepalive overdue");
1163	establish_connection ();	1334	establish_connection ();
1164	}	1335	}
1165	else if (NOW < last_activity + ::conf.keepalive)
1166	w.start (last_activity + ::conf.keepalive);
1167	else if (conf->connectmode != conf_node::C_ONDEMAND	1336	else if (conf->connectmode != conf_node::C_ONDEMAND
1168	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1337	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1169	{	1338	{
		1339	w.start (3);
1170	send_ping (si);	1340	send_ping (si);
1171	w.start (NOW + 5);
1172	}	1341	}
1173	else if (NOW < last_activity + ::conf.keepalive + 10)	1342	else if (when >= -10)
1174	// hold ondemand connections implicitly a few seconds longer	1343	// hold ondemand connections implicitly a few seconds longer
1175	// should delete octx, though, or something like that ;)	1344	// should delete octx, though, or something like that ;)
1176	w.start (last_activity + ::conf.keepalive + 10);	1345	w.start (when + 10);
1177	else	1346	else
1178	reset_connection ();	1347	reset_connection ("keepalive timeout");
1179	}	1348	}
1180		1349
		1350	void
1181	void connection::send_connect_request (int id)	1351	connection::send_connect_request (int id)
1182	{	1352	{
1183	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1353	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1184		1354
1185	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1355	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1356	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1357	THISNODE->protocols);
1186	p->hmac_set (octx);	1358	p->hmac_set (octx);
1187	send_vpn_packet (p, si);	1359	send_vpn_packet (p, si);
1188		1360
1189	delete p;	1361	delete p;
1190	}	1362	}
1191		1363
1192	void connection::script_node ()	1364	void
		1365	connection::script_init_env (const char *ext)
1193	{	1366	{
1194	vpn->script_if_up ();
1195
1196	char *env;	1367	char *env;
		1368	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
		1369	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
		1370	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
		1371	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
		1372	conf->id & 0xff); putenv (env);
		1373	}
		1374
		1375	void
		1376	connection::script_init_connect_env ()
		1377	{
		1378	vpn->script_init_env ();
		1379
		1380	char *env;
1197	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1381	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1382	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1198	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1383	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1199	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1384	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1200	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1385	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1201	}	1386	}
1202		1387
		1388	inline const char *
1203	const char *connection::script_node_up ()	1389	connection::script_node_up ()
1204	{	1390	{
1205	script_node ();	1391	script_init_connect_env ();
1206		1392
1207	putenv ("STATE=up");	1393	putenv ((char *)"STATE=up");
1208		1394
		1395	char *filename;
		1396	asprintf (&filename,
		1397	"%s/%s",
		1398	confbase,
1209	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1399	::conf.script_node_up ? ::conf.script_node_up : "node-up");
1210	}
1211		1400
		1401	return filename;
		1402	}
		1403
		1404	inline const char *
		1405	connection::script_node_change ()
		1406	{
		1407	script_init_connect_env ();
		1408
		1409	putenv ((char *)"STATE=change");
		1410
		1411	char *filename;
		1412	asprintf (&filename,
		1413	"%s/%s",
		1414	confbase,
		1415	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1416
		1417	return filename;
		1418	}
		1419
		1420	inline const char *
1212	const char *connection::script_node_down ()	1421	connection::script_node_down ()
1213	{	1422	{
1214	script_node ();	1423	script_init_connect_env ();
1215		1424
1216	putenv ("STATE=down");	1425	putenv ((char *)"STATE=down");
1217		1426
1218	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1427	char *filename;
		1428	asprintf (&filename,
		1429	"%s/%s",
		1430	confbase,
		1431	::conf.script_node_down ? ::conf.script_node_down : "node-down");
		1432
		1433	return filename;
1219	}	1434	}
1220		1435
1221	connection::connection (struct vpn vpn, conf_node conf)	1436	connection::connection (struct vpn vpn, conf_node conf)
1222	: vpn(vpn), conf(conf)	1437	: 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	1438	#if ENABLE_DNS
1227	, dnsv4_tw (this, &connection::dnsv4_cb)	1439	dns (0),
1228	#endif	1440	#endif
		1441	data_queue(conf->max_ttl, conf->max_queue + 1),
		1442	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1229	{	1443	{
		1444	rekey .set<connection, &connection::rekey_cb > (this);
		1445	keepalive .set<connection, &connection::keepalive_cb > (this);
		1446	establish_connection.set<connection, &connection::establish_connection_cb> (this);
		1447
		1448	last_establish_attempt = 0.;
1230	octx = ictx = 0;	1449	octx = ictx = 0;
1231	retry_cnt = 0;
1232		1450
1233	if (!conf->protocols) // make sure some protocol is enabled	1451	connectmode = conf->connectmode;
1234	conf->protocols = PROT_UDPv4;
1235		1452
1236	connectmode = conf_node::C_ALWAYS; // initial setting	1453	// queue a dummy packet to force an initial connection attempt
		1454	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
		1455	vpn_queue.put (new net_packet);
		1456
1237	reset_connection ();	1457	reset_connection ("startup");
1238	}	1458	}
1239		1459
1240	connection::~connection ()	1460	connection::~connection ()
1241	{	1461	{
1242	shutdown ();	1462	shutdown ();
1243	}	1463	}
1244		1464
		1465	void
1245	void connection_init ()	1466	connection_init ()
1246	{	1467	{
1247	auth_rate_limiter.clear ();	1468	auth_rate_limiter.clear ();
1248	reset_rate_limiter.clear ();	1469	reset_rate_limiter.clear ();
1249	}	1470	}
1250		1471

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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 1.116 by root, Mon Apr 1 03:10:26 2019 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 1.116 by root, Mon Apr 1 03:10:26 2019 UTC