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

Comparing gvpe/src/connection.C (file contents):
Revision 1.67 by pcg, Thu Aug 7 16:34:21 2008 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) 2003-2005 Marc Lehmann <gvpe@schmorp.de>	3	Copyright (C) 2003-2008,2010,2011,2013 Marc Lehmann <gvpe@schmorp.de>
4		4
5	This file is part of GVPE.	5	This file is part of GVPE.
6		6
7	GVPE is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify it
8	it under the terms of the GNU General Public License as published by	8	under the terms of the GNU General Public License as published by the
9	the Free Software Foundation; either version 2 of the License, or	9	Free Software Foundation; either version 3 of the License, or (at your
10	(at your option) any later version.	10	option) any later version.
11		11
12	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful, but
13	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	WITHOUT ANY WARRANTY; without even the implied warranty of
14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General
15	GNU General Public License for more details.	15	Public License for more details.
16		16
17	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License along
18	along with gvpe; if not, write to the Free Software	18	with this program; if not, see <http://www.gnu.org/licenses/>.
19	Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA	19
		20	Additional permission under GNU GPL version 3 section 7
		21
		22	If you modify this Program, or any covered work, by linking or
		23	combining it with the OpenSSL project's OpenSSL library (or a modified
		24	version of that library), containing parts covered by the terms of the
		25	OpenSSL or SSLeay licenses, the licensors of this Program grant you
		26	additional permission to convey the resulting work. Corresponding
		27	Source for a non-source form of such a combination shall include the
		28	source code for the parts of OpenSSL used as well as that of the
		29	covered work.
20	*/	30	*/
21		31
22	#include "config.h"	32	#include "config.h"
23		33
24	#include <list>	34	#include <list>
		35	#include <queue>
		36	#include <utility>
25		37
26	#include <openssl/rand.h>	38	#include <openssl/rand.h>
27	#include <openssl/evp.h>	39	#include <openssl/evp.h>
28	#include <openssl/rsa.h>	40	#include <openssl/rsa.h>
29	#include <openssl/err.h>	41	#include <openssl/err.h>
31	#include "conf.h"	43	#include "conf.h"
32	#include "slog.h"	44	#include "slog.h"
33	#include "device.h"	45	#include "device.h"
34	#include "vpn.h"	46	#include "vpn.h"
35	#include "connection.h"	47	#include "connection.h"
		48	#include "hkdf.h"
36		49
37	#include "netcompat.h"	50	#include "netcompat.h"
38		51
39	#if !HAVE_RAND_PSEUDO_BYTES
40	# define RAND_pseudo_bytes RAND_bytes
41	#endif
42
43	#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
44		54
45	#define ULTRA_FAST 1	55	#define ULTRA_FAST 1
46	#define HLOG 15	56	#define HLOG 15
47	#include "lzf/lzf.h"	57	#include "lzf/lzf.h"
48	#include "lzf/lzf_c.c"	58	#include "lzf/lzf_c.c"
49	#include "lzf/lzf_d.c"	59	#include "lzf/lzf_d.c"
50		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	//////////////////////////////////////////////////////////////////////////////
		104
51	struct crypto_ctx	105	struct crypto_ctx
52	{	106	{
53	EVP_CIPHER_CTX cctx;	107	EVP_CIPHER_CTX cctx;
54	HMAC_CTX hctx;	108	HMAC_CTX hctx;
55		109
56	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);
57	~crypto_ctx ();	111	~crypto_ctx ();
58	};	112	};
59		113
60	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)
61	{	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
62	EVP_CIPHER_CTX_init (&cctx);	144	EVP_CIPHER_CTX_init (&cctx);
63	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));	145	require (EVP_CipherInit_ex (&cctx, CIPHER (), 0, cipher_key, 0, enc));
64	HMAC_CTX_init (&hctx);	146	}
65	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
66	}	147	}
67		148
68	crypto_ctx::~crypto_ctx ()	149	crypto_ctx::~crypto_ctx ()
69	{	150	{
70	require (EVP_CIPHER_CTX_cleanup (&cctx));	151	require (EVP_CIPHER_CTX_cleanup (&cctx));
71	HMAC_CTX_cleanup (&hctx);	152	HMAC_CTX_cleanup (&hctx);
72	}	153	}
73		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
74	static void	182	static void
75	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	183	auth_hash (const auth_data &auth, auth_mac &mac)
76	{	184	{
77	EVP_MD_CTX ctx;	185	HMAC_CTX ctx;
78		186
79	EVP_MD_CTX_init (&ctx);	187	HMAC_CTX_init (&ctx);
80	require (EVP_DigestInit (&ctx, RSA_HASH));	188	require (HMAC_Init_ex (&ctx, auth.rsa.auth_key, sizeof (auth.rsa.auth_key), AUTH_DIGEST (), 0));
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));	189	require (HMAC_Update (&ctx, (const unsigned char *)&auth, sizeof auth));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));	190	require (HMAC_Final (&ctx, (unsigned char *)&mac, 0));
84	EVP_MD_CTX_cleanup (&ctx);	191	HMAC_CTX_cleanup (&ctx);
85	}	192	}
86		193
87	struct rsa_entry	194	void
		195	connection::generate_auth_data ()
88	{	196	{
89	tstamp expire;	197	if (auth_expire < ev_now ())
90	rsaid id;
91	rsachallenge chg;
92	};
93
94	struct rsa_cache : list<rsa_entry>
95	{
96	inline void cleaner_cb (ev::timer &w, int revents); ev::timer cleaner;
97
98	bool find (const rsaid &id, rsachallenge &chg)
99	{
100	for (iterator i = begin (); i != end (); ++i)
101	{	198	{
102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	199	// request data
103	{	200	rand_fill (snd_auth.rsa);
104	memcpy (&chg, &i->chg, sizeof chg);	201	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
		202	auth_hash (snd_auth, snd_auth_mac);
105		203
106	erase (i);	204	// eventual response data
107	return true;	205	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
108	}
109	}	206	}
110		207
111	if (!cleaner.is_active ())	208	// every use prolongs the expiry
112	cleaner.again ();
113
114	return false;
115	}
116
117	void gen (rsaid &id, rsachallenge &chg)
118	{
119	rsa_entry e;
120
121	RAND_bytes ((unsigned char *)&id, sizeof id);
122	RAND_bytes ((unsigned char *)&chg, sizeof chg);
123
124	e.expire = ev_now () + RSA_TTL;	209	auth_expire = ev_now () + AUTH_TTL;
125	e.id = id;
126	memcpy (&e.chg, &chg, sizeof chg);
127
128	push_back (e);
129
130	if (!cleaner.is_active ())
131	cleaner.again ();
132	}
133
134	rsa_cache ()
135	{
136	cleaner.set<rsa_cache, &rsa_cache::cleaner_cb> (this);
137	cleaner.set (RSA_TTL, RSA_TTL);
138	}
139
140	} rsa_cache;
141
142	void rsa_cache::cleaner_cb (ev::timer &w, int revents)
143	{
144	if (empty ())
145	w.stop ();
146	else
147	{
148	for (iterator i = begin (); i != end (); )
149	if (i->expire <= ev_now ())
150	i = erase (i);
151	else
152	++i;
153	}
154	}	210	}
155		211
156	//////////////////////////////////////////////////////////////////////////////	212	//////////////////////////////////////////////////////////////////////////////
157		213
158	pkt_queue::pkt_queue (double max_ttl, int max_queue)	214	pkt_queue::pkt_queue (double max_ttl, int max_queue)
…		…
172	delete p;	228	delete p;
173		229
174	delete [] queue;	230	delete [] queue;
175	}	231	}
176		232
		233	void
177	void pkt_queue::expire_cb (ev::timer &w, int revents)	234	pkt_queue::expire_cb (ev::timer &w, int revents)
178	{	235	{
179	ev_tstamp expire = ev_now () - max_ttl;	236	ev_tstamp expire = ev_now () - max_ttl;
180		237
181	for (;;)	238	for (;;)
182	{	239	{
…		…
193		250
194	delete get ();	251	delete get ();
195	}	252	}
196	}	253	}
197		254
		255	void
198	void pkt_queue::put (net_packet *p)	256	pkt_queue::put (net_packet *p)
199	{	257	{
200	ev_tstamp now = ev_now ();	258	ev_tstamp now = ev_now ();
201		259
202	// start expiry timer	260	// start expiry timer
203	if (empty ())	261	if (empty ())
…		…
212	queue[i].tstamp = now;	270	queue[i].tstamp = now;
213		271
214	i = ni;	272	i = ni;
215	}	273	}
216		274
217	net_packet *pkt_queue::get ()	275	net_packet *
		276	pkt_queue::get ()
218	{	277	{
219	if (empty ())	278	if (empty ())
220	return 0;	279	return 0;
221		280
222	net_packet *p = queue[j].pkt;	281	net_packet *p = queue[j].pkt;
…		…
246		305
247	bool can (const sockinfo &si) { return can((u32)si.host); }	306	bool can (const sockinfo &si) { return can((u32)si.host); }
248	bool can (u32 host);	307	bool can (u32 host);
249	};	308	};
250		309
251	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	310	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
252		311
		312	bool
253	bool net_rate_limiter::can (u32 host)	313	net_rate_limiter::can (u32 host)
254	{	314	{
255	iterator i;	315	iterator i;
256		316
257	for (i = begin (); i != end (); )	317	for (i = begin (); i != end (); )
258	if (i->host == host)	318	if (i->host == host)
…		…
305		365
306	/////////////////////////////////////////////////////////////////////////////	366	/////////////////////////////////////////////////////////////////////////////
307		367
308	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	368	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];
309		369
		370	void
310	void hmac_packet::hmac_gen (crypto_ctx *ctx)	371	hmac_packet::hmac_gen (crypto_ctx *ctx)
311	{	372	{
312	unsigned int xlen;	373	unsigned int xlen;
313		374
314	HMAC_CTX *hctx = &ctx->hctx;	375	HMAC_CTX *hctx = &ctx->hctx;
315		376
316	HMAC_Init_ex (hctx, 0, 0, 0, 0);	377	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
317	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	378	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),
318	len - sizeof (hmac_packet));	379	len - sizeof (hmac_packet)));
319	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);	380	require (HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen));
320	}	381	}
321		382
322	void	383	void
323	hmac_packet::hmac_set (crypto_ctx *ctx)	384	hmac_packet::hmac_set (crypto_ctx *ctx)
324	{	385	{
…		…
333	hmac_gen (ctx);	394	hmac_gen (ctx);
334		395
335	return !memcmp (hmac, hmac_digest, HMACLENGTH);	396	return !memcmp (hmac, hmac_digest, HMACLENGTH);
336	}	397	}
337		398
		399	void
338	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	400	vpn_packet::set_hdr (ptype type_, unsigned int dst)
339	{	401	{
340	type = type_;	402	type = type_;
341		403
342	int src = THISNODE->id;	404	int src = THISNODE->id;
343		405
…		…
348		410
349	#define MAXVPNDATA (MAX_MTU - 6 - 6)	411	#define MAXVPNDATA (MAX_MTU - 6 - 6)
350	#define DATAHDR (sizeof (u32) + RAND_SIZE)	412	#define DATAHDR (sizeof (u32) + RAND_SIZE)
351		413
352	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
353	{	423	{
354	u8 data[MAXVPNDATA + DATAHDR]; // seqno
355
356	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
357	tap_packet unpack (connection conn, u32 &seqno);
358	private:
359
360	const u32 data_hdr_size () const
361	{
362	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;	424	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
363	}
364	};	425	}
		426	};
365		427
366	void	428	void
367	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)
368	{	430	{
369	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	431	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
371	ptype type = PT_DATA_UNCOMPRESSED;	433	ptype type = PT_DATA_UNCOMPRESSED;
372		434
373	#if ENABLE_COMPRESSION	435	#if ENABLE_COMPRESSION
374	u8 cdata[MAX_MTU];	436	u8 cdata[MAX_MTU];
375		437
376	if (conn->features & ENABLE_COMPRESSION)	438	if (conn->features & FEATURE_COMPRESSION)
377	{	439	{
378	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	440	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
379		441
380	if (cl)	442	if (cl)
381	{	443	{
…		…
387	d[1] = cl;	449	d[1] = cl;
388	}	450	}
389	}	451	}
390	#endif	452	#endif
391		453
392	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	454	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
393		455
394	struct {	456	struct {
395	#if RAND_SIZE	457	#if RAND_SIZE
396	u8 rnd[RAND_SIZE];	458	u8 rnd[RAND_SIZE];
397	#endif	459	#endif
398	u32 seqno;	460	u32 seqno;
399	} datahdr;	461	} datahdr;
400		462
401	datahdr.seqno = ntohl (seqno);	463	datahdr.seqno = ntohl (seqno);
402	#if RAND_SIZE	464	#if RAND_SIZE
403	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);
404	#endif	468	#endif
405		469
406	require (EVP_EncryptUpdate (cctx,	470	require (EVP_EncryptUpdate (cctx,
407	(unsigned char *) data + outl, &outl2,	471	(unsigned char *) data + outl, &outl2,
408	(unsigned char *) &datahdr, DATAHDR));	472	(unsigned char *) &datahdr, DATAHDR));
…		…
430	int outl = 0, outl2;	494	int outl = 0, outl2;
431	tap_packet *p = new tap_packet;	495	tap_packet *p = new tap_packet;
432	u8 *d;	496	u8 *d;
433	u32 l = len - data_hdr_size ();	497	u32 l = len - data_hdr_size ();
434		498
435	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	499	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
436		500
437	#if ENABLE_COMPRESSION	501	#if ENABLE_COMPRESSION
438	u8 cdata[MAX_MTU];	502	u8 cdata[MAX_MTU];
439		503
440	if (type == PT_DATA_COMPRESSED)	504	if (type == PT_DATA_COMPRESSED)
441	d = cdata;	505	d = cdata;
442	else	506	else
443	#endif	507	#endif
444	d = &(*p)[6 + 6 - DATAHDR];	508	d = &(*p)[6 + 6] - DATAHDR;
445		509
446	/* 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
447	require (EVP_DecryptUpdate (cctx,	517	require (EVP_DecryptUpdate (cctx,
448	d, &outl2,	518	d, &outl2,
449	(unsigned char *)&data, len - data_hdr_size ()));	519	(unsigned char *)&data, len - data_hdr_size ()));
450	outl += outl2;	520	outl += outl2;
451		521
…		…
482	}	552	}
483	};	553	};
484		554
485	struct config_packet : vpn_packet	555	struct config_packet : vpn_packet
486	{	556	{
487	// actually, hmaclen cannot be checked because the hmac	557	u8 serial[SERIAL_SIZE];
488	// field comes before this data, so peers with other
489	// hmacs simply will not work.
490	u8 prot_major, prot_minor, randsize, hmaclen;	558	u8 prot_major, prot_minor, randsize;
491	u8 flags, challengelen, features, pad3;	559	u8 flags, features, pad6, pad7, pad8;
492	u32 cipher_nid, digest_nid, hmac_nid;	560	u32 cipher_nid, mac_nid, auth_nid;
493		561
494	void setup (ptype type, int dst);	562	void setup (ptype type, int dst);
495	bool chk_config () const;	563	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
496		564
497	static u8 get_features ()	565	static u8 get_features ()
498	{	566	{
499	u8 f = 0;	567	u8 f = 0;
500	#if ENABLE_COMPRESSION	568	#if ENABLE_COMPRESSION
…		…
508	#endif	576	#endif
509	return f;	577	return f;
510	}	578	}
511	};	579	};
512		580
		581	void
513	void config_packet::setup (ptype type, int dst)	582	config_packet::setup (ptype type, int dst)
514	{	583	{
515	prot_major = PROTOCOL_MAJOR;	584	prot_major = PROTOCOL_MAJOR;
516	prot_minor = PROTOCOL_MINOR;	585	prot_minor = PROTOCOL_MINOR;
517	randsize = RAND_SIZE;	586	randsize = RAND_SIZE;
518	hmaclen = HMACLENGTH;
519	flags = 0;	587	flags = 0;
520	challengelen = sizeof (rsachallenge);
521	features = get_features ();	588	features = get_features ();
522		589
		590	strncpy ((char *)serial, conf.serial, sizeof (serial));
		591
523	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	592	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
524	digest_nid = htonl (EVP_MD_type (RSA_HASH));
525	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 ()));
526		595
527	len = sizeof (*this) - sizeof (net_packet);	596	len = sizeof (*this) - sizeof (net_packet);
528	set_hdr (type, dst);	597	set_hdr (type, dst);
529	}	598	}
530		599
531	bool config_packet::chk_config () const	600	bool
		601	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
532	{	602	{
533	if (prot_major != PROTOCOL_MAJOR)	603	if (prot_major != PROTOCOL_MAJOR)
534	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	604	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		605	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
535	else if (randsize != RAND_SIZE)	606	else if (randsize != RAND_SIZE)
536	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	607	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
537	else if (hmaclen != HMACLENGTH)	608	conf->nodename, (const char *)rsi, randsize, RAND_SIZE);
538	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
539	else if (challengelen != sizeof (rsachallenge))
540	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
541	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	609	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER ())))
542	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	610	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
543	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	611	conf->nodename, (const char *)rsi, ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER ()));
544	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
545	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	612	else if (mac_nid != htonl (EVP_MD_type (MAC_DIGEST ())))
546	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (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 ()));
547	else	618	else
		619	{
		620	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		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)
548	return true;	626	return true;
		627	}
549		628
550	return false;	629	return false;
551	}	630	}
552		631
553	struct auth_req_packet : config_packet	632	struct auth_req_packet : config_packet // UNPROTECTED
554	{	633	{
555	char magic[8];	634	char magic[8];
556	u8 initiate; // false if this is just an automatic reply	635	u8 initiate; // false if this is just an automatic reply
557	u8 protocols; // supported protocols (will be patched on forward)	636	u8 protocols; // supported protocols (will be patched on forward)
558	u8 pad2, pad3;	637	u8 pad2, pad3;
559	rsaid id;	638	auth_encr encr;
560	rsaencrdata encr;
561		639
562	auth_req_packet (int dst, bool initiate_, u8 protocols_)	640	auth_req_packet (int dst, bool initiate_, u8 protocols_)
563	{	641	{
564	config_packet::setup (PT_AUTH_REQ, dst);	642	config_packet::setup (PT_AUTH_REQ, dst);
565	strncpy (magic, MAGIC, 8);	643	memcpy (magic, MAGIC, 8);
566	initiate = !!initiate_;	644	initiate = !!initiate_;
567	protocols = protocols_;	645	protocols = protocols_;
568		646
569	len = sizeof (*this) - sizeof (net_packet);	647	len = sizeof (*this) - sizeof (net_packet);
570	}	648	}
571	};	649	};
572		650
573	struct auth_res_packet : config_packet	651	struct auth_res_packet : vpn_packet // UNPROTECTED
574	{	652	{
575	rsaid id;
576	u8 pad1, pad2, pad3;
577	u8 response_len; // encrypted length
578	rsaresponse response;	653	auth_response response;
579		654
580	auth_res_packet (int dst)	655	auth_res_packet (int dst)
581	{	656	{
582	config_packet::setup (PT_AUTH_RES, dst);	657	set_hdr (PT_AUTH_RES, dst);
583		658
584	len = sizeof (*this) - sizeof (net_packet);	659	len = sizeof (*this) - sizeof (net_packet);
585	}	660	}
586	};	661	};
587		662
…		…
617	};	692	};
618		693
619	/////////////////////////////////////////////////////////////////////////////	694	/////////////////////////////////////////////////////////////////////////////
620		695
621	void	696	void
622	connection::connection_established ()	697	connection::connection_established (const sockinfo &rsi)
623	{	698	{
624	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	699	if (!have_snd_auth \|\| !have_rcv_auth)
		700	return;
625		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
626	if (ictx && octx)	732	if (ictx && octx)
627	{	733	{
628	// make sure rekeying timeouts are slightly asymmetric	734	while (tap_packet p = (tap_packet )data_queue.get ())
629	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
630	rekey.start (rekey_interval, rekey_interval);
631	keepalive.start (::conf.keepalive);
632
633	// send queued packets
634	if (ictx && octx)
635	{	735	{
636	while (tap_packet p = (tap_packet )data_queue.get ())
637	{
638	if (p->len) send_data_packet (p);	736	if (p->len) send_data_packet (p);
639	delete p;	737	delete p;
640	}
641
642	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
643	{
644	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
645	delete p;
646	}
647	}	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	}
648	}	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 ());
649	else	755	else
650	{	756	{
651	retry_cnt = 0;
652	establish_connection.start (5);
653	keepalive.stop ();
654	rekey.stop ();
655	}
656	}
657
658	void
659	connection::reset_si ()
660	{
661	protocol = best_protocol (THISNODE->protocols & conf->protocols);
662
663	// mask out protocols we cannot establish
664	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
665	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
666	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
667
668	if (protocol
669	&& (!conf->can_direct (THISNODE)
670	\|\| !THISNODE->can_direct (conf)))
671	{
672	slog (L_DEBUG, _("%s: direct connection denied"), conf->nodename);	757	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
673	protocol = 0;	758	protocol = 0;
674	}	759	}
675		760
676	si.set (conf, protocol);	761	si.set (conf, protocol);
		762
		763	is_direct = si.valid ();
677	}	764	}
678		765
679	// ensure sockinfo is valid, forward if necessary	766	// ensure sockinfo is valid, forward if necessary
680	const sockinfo &	767	const sockinfo &
681	connection::forward_si (const sockinfo &si) const	768	connection::forward_si (const sockinfo &si) const
682	{	769	{
683	if (!si.valid ())	770	if (!si.valid ())
684	{	771	{
685	connection *r = vpn->find_router ();	772	connection *r = vpn->find_router_for (this);
686		773
687	if (r)	774	if (r)
688	{	775	{
689	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	776	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
690	conf->nodename, r->conf->nodename, (const char *)r->si);	777	conf->nodename, r->conf->nodename);
691	return r->si;	778	return r->si;
692	}	779	}
693	else	780	else
694	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	781	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
695	conf->nodename);	782	conf->nodename);
696	}	783	}
697		784
698	return si;	785	return si;
699	}	786	}
…		…
709	connection::send_ping (const sockinfo &si, u8 pong)	796	connection::send_ping (const sockinfo &si, u8 pong)
710	{	797	{
711	ping_packet *pkt = new ping_packet;	798	ping_packet *pkt = new ping_packet;
712		799
713	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);
714	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	803	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
715		804
716	delete pkt;	805	delete pkt;
717	}	806	}
718		807
…		…
733	void	822	void
734	connection::send_auth_request (const sockinfo &si, bool initiate)	823	connection::send_auth_request (const sockinfo &si, bool initiate)
735	{	824	{
736	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);
737		826
738	rsachallenge chg;	827	generate_auth_data ();
739	rsa_cache.gen (pkt->id, chg);
740	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	828	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
741		829
742	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);
743
744	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
745		832
746	delete pkt;	833	delete pkt;
747	}	834	}
748		835
749	void	836	void
750	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	837	connection::send_auth_response (const sockinfo &si)
751	{	838	{
752	auth_res_packet *pkt = new auth_res_packet (conf->id);	839	auth_res_packet *pkt = new auth_res_packet (conf->id);
753		840
754	pkt->id = id;	841	auth_hash (rcv_auth, pkt->response.mac);
		842	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof (rcv_ecdh_b));
755		843
756	rsa_hash (id, chg, pkt->response);
757
758	pkt->hmac_set (octx);
759
760	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);
761
762	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
763		846
764	delete pkt;	847	delete pkt;
765	}	848	}
766		849
767	void	850	void
768	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	851	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
769	{	852	{
770	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	853	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
771	conf->id, rid, (const char *)rsi);	854	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		855	conf->protocols);
772		856
773	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);
774		858
775	r->hmac_set (octx);	859	r->hmac_set (octx);
776	send_vpn_packet (r, si);	860	send_vpn_packet (r, si);
…		…
779	}	863	}
780		864
781	inline void	865	inline void
782	connection::establish_connection_cb (ev::timer &w, int revents)	866	connection::establish_connection_cb (ev::timer &w, int revents)
783	{	867	{
784	if (!ictx	868	if (!(ictx && octx)
785	&& conf != THISNODE	869	&& conf != THISNODE
786	&& connectmode != conf_node::C_NEVER	870	&& connectmode != conf_node::C_NEVER
787	&& connectmode != conf_node::C_DISABLED	871	&& connectmode != conf_node::C_DISABLED
788	&& !w.is_active ())	872	&& !w.is_active ())
789	{	873	{
…		…
793	{	877	{
794	reset_connection ();	878	reset_connection ();
795	return;	879	return;
796	}	880	}
797		881
		882	last_establish_attempt = ev_now ();
		883
798	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	884	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
799	? (retry_cnt & 3) + 1	885	? (retry_cnt & 3) + 1
800	: 1 << (retry_cnt >> 2));	886	: 1 << (retry_cnt >> 2));
801		887
802	reset_si ();	888	reset_si ();
803		889
804	bool slow = si.prot & PROT_SLOW;	890	bool slow = si.prot & PROT_SLOW;
805		891
806	if (si.prot && !si.host)	892	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
807	{	893	{
808	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
809	/TODO/ /* start the timer so we don't recurse endlessly */	894	/TODO/ /* start the timer so we don't recurse endlessly */
810	w.start (1);	895	w.start (1);
811	vpn->send_connect_request (conf->id);	896	vpn->send_connect_request (this);
812	}	897	}
813	else	898	else
814	{	899	{
815	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	900	if (si.valid ())
		901	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		902	conf->nodename, (const char *)si);
816		903
817	const sockinfo &dsi = forward_si (si);	904	const sockinfo &dsi = forward_si (si);
818		905
819	slow = slow \|\| (dsi.prot & PROT_SLOW);	906	slow = slow \|\| (dsi.prot & PROT_SLOW);
820		907
…		…
825	else	912	else
826	send_ping (dsi, 0);	913	send_ping (dsi, 0);
827	}	914	}
828	}	915	}
829		916
830	retry_int *= slow ? 8. : 0.7;	917	retry_int *= slow ? 8. : 0.9;
831		918
832	if (retry_int < conf->max_retry)	919	if (retry_int < conf->max_retry)
833	retry_cnt++;	920	retry_cnt++;
834	else	921	else
835	retry_int = conf->max_retry;	922	retry_int = conf->max_retry;
…		…
846	slog (L_INFO, _("%s(%s): connection lost"),	933	slog (L_INFO, _("%s(%s): connection lost"),
847	conf->nodename, (const char *)si);	934	conf->nodename, (const char *)si);
848		935
849	if (::conf.script_node_down)	936	if (::conf.script_node_down)
850	{	937	{
851	run_script_cb cb;	938	run_script_cb *cb = new run_script_cb;
852	cb.set<connection, &connection::script_node_down> (this);	939	cb->set<connection, &connection::script_node_down> (this);
853	if (!run_script (cb, false))
854	slog (L_WARN, _("node-down command execution failed, continuing."));	940	run_script_queued (cb, _("node-down command execution failed, continuing."));
855	}	941	}
856	}	942	}
857		943
858	delete ictx; ictx = 0;	944	delete ictx; ictx = 0;
859	delete octx; octx = 0;	945	delete octx; octx = 0;
860	#if ENABLE_DNS
861	dnsv4_reset_connection ();
862	#endif
863		946
864	si.host = 0;	947	si.host = 0;
865		948
		949	have_snd_auth = false;
		950	have_rcv_auth = false;
		951	auth_expire = 0.;
		952
866	last_activity = 0;	953	last_activity = 0.;
		954	//last_si_change = 0.;
867	retry_cnt = 0;	955	retry_cnt = 0;
868		956
869	rekey.stop ();	957	rekey.stop ();
870	keepalive.stop ();	958	keepalive.stop ();
871	establish_connection.stop ();	959	establish_connection.stop ();
…		…
878	send_reset (si);	966	send_reset (si);
879		967
880	reset_connection ();	968	reset_connection ();
881	}	969	}
882		970
		971	// poor-man's rekeying
883	inline void	972	inline void
884	connection::rekey_cb (ev::timer &w, int revents)	973	connection::rekey_cb (ev::timer &w, int revents)
885	{	974	{
886	reset_connection ();	975	reset_connection ();
887	establish_connection ();	976	establish_connection ();
…		…
905	if (oseqno > MAX_SEQNO)	994	if (oseqno > MAX_SEQNO)
906	rekey ();	995	rekey ();
907	}	996	}
908		997
909	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
910	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	1009	connection::inject_data_packet (tap_packet *pkt)
911	{	1010	{
912	if (ictx && octx)	1011	if (ictx && octx)
913	send_data_packet (pkt);	1012	send_data_packet (pkt);
914	else	1013	else
915	{	1014	{
916	if (!broadcast)
917	data_queue.put (new tap_packet (*pkt));	1015	data_queue.put (new tap_packet (*pkt));
918		1016	post_inject_queue ();
919	establish_connection ();
920	}	1017	}
921	}	1018	}
922		1019
		1020	void
923	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1021	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
924	{	1022	{
925	if (ictx && octx)	1023	if (ictx && octx)
926	send_vpn_packet (pkt, si, tos);	1024	send_vpn_packet (pkt, si, tos);
927	else	1025	else
928	{	1026	{
929	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1027	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
930		1028	post_inject_queue ();
931	establish_connection ();
932	}	1029	}
933	}	1030	}
934		1031
935	void	1032	void
936	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1033	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
937	{	1034	{
938	last_activity = ev_now ();	1035	last_activity = ev_now ();
939		1036
940	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.",
941	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1038	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
942		1039
943	if (connectmode == conf_node::C_DISABLED)	1040	if (connectmode == conf_node::C_DISABLED)
944	return;	1041	return;
945		1042
946	switch (pkt->typ ())	1043	switch (pkt->typ ())
947	{	1044	{
948	case vpn_packet::PT_PING:	1045	case vpn_packet::PT_PING:
		1046	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1047
949	// we send pings instead of auth packets after some retries,	1048	// we send pings instead of auth packets after some retries,
950	// so reset the retry counter and establish a connection	1049	// so reset the retry counter and establish a connection
951	// when we receive a ping.	1050	// when we receive a ping.
952	if (!ictx)	1051	if (!ictx)
953	{	1052	{
954	if (auth_rate_limiter.can (rsi))	1053	if (auth_rate_limiter.can (rsi))
955	send_auth_request (rsi, true);	1054	send_auth_request (rsi, true);
956	}	1055	}
957	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.
958	send_ping (rsi, 1); // pong	1059	send_ping (rsi, 1); // pong
959		1060
960	break;	1061	break;
961		1062
962	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 ();
963	break;	1069	break;
964		1070
965	case vpn_packet::PT_RESET:	1071	case vpn_packet::PT_RESET:
966	{	1072	{
967	reset_connection ();	1073	reset_connection ();
968		1074
969	config_packet p = (config_packet ) pkt;	1075	config_packet p = (config_packet ) pkt;
970		1076
971	if (!p->chk_config ())	1077	if (p->chk_config (conf, rsi) && connectmode == conf_node::C_ALWAYS)
972	{
973	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
974	conf->nodename, (const char *)rsi);
975	connectmode = conf_node::C_DISABLED;
976	}
977	else if (connectmode == conf_node::C_ALWAYS)
978	establish_connection ();	1078	establish_connection ();
979	}	1079	}
980	break;	1080	break;
981		1081
982	case vpn_packet::PT_AUTH_REQ:	1082	case vpn_packet::PT_AUTH_REQ:
983	if (auth_rate_limiter.can (rsi))	1083	if (auth_rate_limiter.can (rsi))
984	{	1084	{
985	auth_req_packet p = (auth_req_packet ) pkt;	1085	auth_req_packet p = (auth_req_packet )pkt;
986		1086
987	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);
988		1090
989	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))
990	{	1097	{
991	if (p->prot_minor != PROTOCOL_MINOR)	1098	if (p->prot_minor != PROTOCOL_MINOR)
992	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."),
993	conf->nodename, (const char *)rsi,	1100	conf->nodename, (const char *)rsi,
994	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1101	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
995		1102
996	if (p->initiate)	1103	if (p->initiate)
997	send_auth_request (rsi, false);	1104	send_auth_request (rsi, false);
998		1105
999	rsachallenge k;	1106	auth_data auth;
1000		1107
1001	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1108	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
1002	{	1109	{
1003	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1110	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
1004	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	1111	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
1005	break;
1006	}	1112	}
1007	else	1113	else
1008	{	1114	{
1009	delete octx;	1115	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
1010		1116
1011	octx = new crypto_ctx (k, 1);	1117	rcv_auth = auth;
1012	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1118	have_rcv_auth = true;
1013		1119
		1120	send_auth_response (rsi);
		1121
		1122	if (chg)
		1123	{
1014	conf->protocols = p->protocols;	1124	conf->protocols = p->protocols;
1015	features = p->features & config_packet::get_features ();	1125	features = p->features & config_packet::get_features ();
1016		1126
1017	send_auth_response (rsi, p->id, k);
1018
1019	connection_established ();	1127	connection_established (rsi);
1020
1021	break;	1128	}
1022	}	1129	}
		1130
		1131	break;
1023	}	1132	}
1024	else
1025	slog (L_WARN, _("%s(%s): protocol mismatch"),
1026	conf->nodename, (const char *)rsi);
1027		1133
1028	send_reset (rsi);	1134	send_reset (rsi);
1029	}	1135	}
1030		1136
1031	break;	1137	break;
1032		1138
1033	case vpn_packet::PT_AUTH_RES:	1139	case vpn_packet::PT_AUTH_RES:
1034	{	1140	{
1035	auth_res_packet p = (auth_res_packet ) pkt;	1141	auth_res_packet p = (auth_res_packet )pkt;
1036		1142
1037	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1143	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
1038		1144
1039	if (p->chk_config ())	1145	if (memcmp (&p->response.mac, snd_auth_mac, sizeof (snd_auth_mac)))
1040	{	1146	{
1041	if (p->prot_minor != PROTOCOL_MINOR)
1042	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
1043	conf->nodename, (const char *)rsi,
1044	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
1045
1046	rsachallenge chg;
1047
1048	if (!rsa_cache.find (p->id, chg))
1049	{
1050	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),	1147	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1051	conf->nodename, (const char *)rsi);	1148	conf->nodename, (const char *)rsi);
1052	break;
1053	}
1054	else
1055	{
1056	crypto_ctx *cctx = new crypto_ctx (chg, 0);
1057
1058	if (!p->hmac_chk (cctx))
1059	{
1060	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
1061	"could be an attack, or just corruption or a synchronization error"),
1062	conf->nodename, (const char *)rsi);
1063	break;
1064	}
1065	else
1066	{
1067	rsaresponse h;
1068
1069	rsa_hash (p->id, chg, h);
1070
1071	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
1072	{
1073	prot_minor = p->prot_minor;
1074
1075	delete ictx; ictx = cctx;
1076
1077	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
1078
1079	si = rsi;
1080	protocol = rsi.prot;
1081
1082	connection_established ();
1083
1084	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1085	conf->nodename, (const char *)rsi,
1086	p->prot_major, p->prot_minor);
1087
1088	if (::conf.script_node_up)
1089	{
1090	run_script_cb cb;
1091	cb.set<connection, &connection::script_node_up> (this);
1092	if (!run_script (cb, false))
1093	slog (L_WARN, _("node-up command execution failed, continuing."));
1094	}
1095
1096	break;
1097	}
1098	else
1099	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
1100	conf->nodename, (const char *)rsi);
1101	}
1102
1103	delete cctx;
1104	}
1105	}	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;
1106	}	1159	}
1107		1160
1108	send_reset (rsi);	1161	send_reset (rsi);
1109	break;	1162	break;
1110		1163
…		…
1120	{	1173	{
1121	vpndata_packet p = (vpndata_packet )pkt;	1174	vpndata_packet p = (vpndata_packet )pkt;
1122		1175
1123	if (!p->hmac_chk (ictx))	1176	if (!p->hmac_chk (ictx))
1124	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"
1125	"could be an attack, or just corruption or a synchronization error"),	1178	"could be an attack, or just corruption or a synchronization error."),
1126	conf->nodename, (const char *)rsi);	1179	conf->nodename, (const char *)rsi);
1127	else	1180	else
1128	{	1181	{
1129	u32 seqno;	1182	u32 seqno;
1130	tap_packet *d = p->unpack (this, seqno);	1183	tap_packet *d = p->unpack (this, seqno);
		1184	int seqclass = iseqno.seqno_classify (seqno);
1131		1185
1132	if (iseqno.recv_ok (seqno))	1186	if (seqclass == 0) // ok
1133	{	1187	{
1134	vpn->tap->send (d);	1188	vpn->tap->send (d);
1135		1189
1136	if (si != rsi)	1190	if (si != rsi)
1137	{	1191	{
1138	// fast re-sync on source address 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.)
1139	si = rsi;	1194	// {
1140
1141	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1195	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1142	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);
1143	}	1211	}
		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);
1144	}	1224	}
1145		1225
1146	delete d;	1226	delete d;
1147	break;	1227	break;
1148	}	1228	}
…		…
1152	break;	1232	break;
1153		1233
1154	case vpn_packet::PT_CONNECT_REQ:	1234	case vpn_packet::PT_CONNECT_REQ:
1155	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1235	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1156	{	1236	{
1157	connect_req_packet p = (connect_req_packet ) pkt;	1237	connect_req_packet p = (connect_req_packet )pkt;
1158		1238
1159	if (p->id > 0 && p->id <= vpn->conns.size ())	1239	if (p->id > 0 && p->id <= vpn->conns.size ())
1160	{	1240	{
1161	connection *c = vpn->conns[p->id - 1];	1241	connection *c = vpn->conns[p->id - 1];
1162	conf->protocols = p->protocols;	1242	conf->protocols = p->protocols;
1163		1243
1164	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	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,
1165	conf->id, p->id, c->ictx && c->octx);	1247	c->ictx && c->octx);
1166		1248
1167	if (c->ictx && c->octx)	1249	if (c->ictx && c->octx)
1168	{	1250	{
1169	// send connect_info packets to both sides, in case one is	1251	// send connect_info packets to both sides, in case one is
1170	// behind a nat firewall (or both ;)	1252	// behind a nat firewall (or both ;)
…		…
1193		1275
1194	c->conf->protocols = p->protocols;	1276	c->conf->protocols = p->protocols;
1195	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));
1196	p->si.upgrade_protocol (protocol, c->conf);	1278	p->si.upgrade_protocol (protocol, c->conf);
1197		1279
1198	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]",
1199	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);
1200		1288
1201	const sockinfo &dsi = forward_si (p->si);	1289	const sockinfo &dsi = forward_si (p->si);
1202		1290
1203	if (dsi.valid ())	1291	if (dsi.valid ())
1204	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);
1205	}	1297	}
1206	else	1298	else
1207	slog (L_WARN,	1299	slog (L_WARN,
1208	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1300	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1209	p->id);	1301	p->id);
…		…
1218	}	1310	}
1219		1311
1220	inline void	1312	inline void
1221	connection::keepalive_cb (ev::timer &w, int revents)	1313	connection::keepalive_cb (ev::timer &w, int revents)
1222	{	1314	{
1223	if (ev_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)
1224	{	1320	{
1225	reset_connection ();	1321	reset_connection ();
1226	establish_connection ();	1322	establish_connection ();
1227	}	1323	}
1228	else if (ev_now () < last_activity + ::conf.keepalive)
1229	w.start (last_activity + ::conf.keepalive - ev::now ());
1230	else if (conf->connectmode != conf_node::C_ONDEMAND	1324	else if (conf->connectmode != conf_node::C_ONDEMAND
1231	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1325	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1232	{	1326	{
		1327	w.start (3);
1233	send_ping (si);	1328	send_ping (si);
1234	w.start (5);
1235	}	1329	}
1236	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1330	else if (when >= -10)
1237	// hold ondemand connections implicitly a few seconds longer	1331	// hold ondemand connections implicitly a few seconds longer
1238	// should delete octx, though, or something like that ;)	1332	// should delete octx, though, or something like that ;)
1239	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1333	w.start (when + 10);
1240	else	1334	else
1241	reset_connection ();	1335	reset_connection ();
1242	}	1336	}
1243		1337
		1338	void
1244	void connection::send_connect_request (int id)	1339	connection::send_connect_request (int id)
1245	{	1340	{
1246	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);
1247		1342
1248	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);
1249	p->hmac_set (octx);	1346	p->hmac_set (octx);
1250	send_vpn_packet (p, si);	1347	send_vpn_packet (p, si);
1251		1348
1252	delete p;	1349	delete p;
1253	}	1350	}
1254		1351
		1352	void
1255	void connection::script_init_env (const char *ext)	1353	connection::script_init_env (const char *ext)
1256	{	1354	{
1257	char *env;	1355	char *env;
1258	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1356	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1259	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1357	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1260	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1358	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1261	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1359	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1262	conf->id & 0xff); putenv (env);	1360	conf->id & 0xff); putenv (env);
1263	}	1361	}
1264		1362
		1363	void
1265	void connection::script_init_connect_env ()	1364	connection::script_init_connect_env ()
1266	{	1365	{
1267	vpn->script_init_env ();	1366	vpn->script_init_env ();
1268		1367
1269	char *env;	1368	char *env;
1270	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);
1271	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1371	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1272	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1372	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1273	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1373	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1274	}	1374	}
1275		1375
1276	inline const char *	1376	inline const char *
1277	connection::script_node_up ()	1377	connection::script_node_up ()
1278	{	1378	{
…		…
1288		1388
1289	return filename;	1389	return filename;
1290	}	1390	}
1291		1391
1292	inline const char *	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 *
1293	connection::script_node_down ()	1409	connection::script_node_down ()
1294	{	1410	{
1295	script_init_connect_env ();	1411	script_init_connect_env ();
1296		1412
1297	putenv ((char *)"STATE=down");	1413	putenv ((char *)"STATE=down");
…		…
1308	connection::connection (struct vpn vpn, conf_node conf)	1424	connection::connection (struct vpn vpn, conf_node conf)
1309	: vpn(vpn), conf(conf),	1425	: vpn(vpn), conf(conf),
1310	#if ENABLE_DNS	1426	#if ENABLE_DNS
1311	dns (0),	1427	dns (0),
1312	#endif	1428	#endif
1313	data_queue(conf->max_ttl, conf->max_queue),	1429	data_queue(conf->max_ttl, conf->max_queue + 1),
1314	vpn_queue(conf->max_ttl, conf->max_queue)	1430	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1315	{	1431	{
1316	rekey .set<connection, &connection::rekey_cb > (this);	1432	rekey .set<connection, &connection::rekey_cb > (this);
1317	keepalive .set<connection, &connection::keepalive_cb > (this);	1433	keepalive .set<connection, &connection::keepalive_cb > (this);
1318	establish_connection.set<connection, &connection::establish_connection_cb> (this);	1434	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1319		1435
		1436	last_establish_attempt = 0.;
1320	octx = ictx = 0;	1437	octx = ictx = 0;
1321	retry_cnt = 0;
1322
1323	if (!conf->protocols) // make sure some protocol is enabled
1324	conf->protocols = PROT_UDPv4;
1325		1438
1326	connectmode = conf->connectmode;	1439	connectmode = conf->connectmode;
1327		1440
1328	// queue a dummy packet to force an initial connection attempt	1441	// queue a dummy packet to force an initial connection attempt
1329	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)	1442	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1330	{	1443	vpn_queue.put (new net_packet);
1331	net_packet *p = new net_packet;
1332	p->len = 0;
1333	vpn_queue.put (p);
1334	}
1335		1444
1336	reset_connection ();	1445	reset_connection ();
1337	}	1446	}
1338		1447
1339	connection::~connection ()	1448	connection::~connection ()
1340	{	1449	{
1341	shutdown ();	1450	shutdown ();
1342	}	1451	}
1343		1452
		1453	void
1344	void connection_init ()	1454	connection_init ()
1345	{	1455	{
1346	auth_rate_limiter.clear ();	1456	auth_rate_limiter.clear ();
1347	reset_rate_limiter.clear ();	1457	reset_rate_limiter.clear ();
1348	}	1458	}
1349		1459

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Comparing gvpe/src/connection.C (file contents): Revision 1.67 by pcg, Thu Aug 7 16:34:21 2008 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 1.67 by pcg, Thu Aug 7 16:34:21 2008 UTC vs.
Revision 1.103 by root, Thu Jul 18 17:35:10 2013 UTC