[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 1.104 by root, Fri Jul 19 18:18:27 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, const ecdh_key &b, auth_mac &mac)
76	{	184	{
77	EVP_MD_CTX ctx;	185	hkdf kdf (&auth.ecdh, sizeof (auth.ecdh), AUTH_DIGEST ()); // use remote ecdh b as salt
78		186	kdf.extract (&auth.rsa, sizeof (auth.rsa));
79	EVP_MD_CTX_init (&ctx);	187	kdf.extract_done ();
80	require (EVP_DigestInit (&ctx, RSA_HASH));	188	kdf.expand (mac, sizeof mac, b, sizeof b); // use response ecdh b as info
81	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
82	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
83	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
84	EVP_MD_CTX_cleanup (&ctx);
85	}	189	}
86		190
87	struct rsa_entry	191	void
		192	connection::generate_auth_data ()
88	{	193	{
89	tstamp expire;	194	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	{	195	{
102	if (!memcmp (&id, &i->id, sizeof id) && i->expire > ev_now ())	196	// request data
103	{	197	rand_fill (snd_auth.rsa);
104	memcpy (&chg, &i->chg, sizeof chg);	198	curve25519_generate (snd_ecdh_a, snd_auth.ecdh);
105		199
106	erase (i);	200	// eventual response data
107	return true;	201	curve25519_generate (rcv_ecdh_a, rcv_ecdh_b);
108	}
109	}	202	}
110		203
111	if (!cleaner.is_active ())	204	// 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;	205	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	}	206	}
155		207
156	//////////////////////////////////////////////////////////////////////////////	208	//////////////////////////////////////////////////////////////////////////////
157		209
158	pkt_queue::pkt_queue (double max_ttl, int max_queue)	210	pkt_queue::pkt_queue (double max_ttl, int max_queue)
…		…
172	delete p;	224	delete p;
173		225
174	delete [] queue;	226	delete [] queue;
175	}	227	}
176		228
		229	void
177	void pkt_queue::expire_cb (ev::timer &w, int revents)	230	pkt_queue::expire_cb (ev::timer &w, int revents)
178	{	231	{
179	ev_tstamp expire = ev_now () - max_ttl;	232	ev_tstamp expire = ev_now () - max_ttl;
180		233
181	for (;;)	234	for (;;)
182	{	235	{
…		…
193		246
194	delete get ();	247	delete get ();
195	}	248	}
196	}	249	}
197		250
		251	void
198	void pkt_queue::put (net_packet *p)	252	pkt_queue::put (net_packet *p)
199	{	253	{
200	ev_tstamp now = ev_now ();	254	ev_tstamp now = ev_now ();
201		255
202	// start expiry timer	256	// start expiry timer
203	if (empty ())	257	if (empty ())
…		…
212	queue[i].tstamp = now;	266	queue[i].tstamp = now;
213		267
214	i = ni;	268	i = ni;
215	}	269	}
216		270
217	net_packet *pkt_queue::get ()	271	net_packet *
		272	pkt_queue::get ()
218	{	273	{
219	if (empty ())	274	if (empty ())
220	return 0;	275	return 0;
221		276
222	net_packet *p = queue[j].pkt;	277	net_packet *p = queue[j].pkt;
…		…
246		301
247	bool can (const sockinfo &si) { return can((u32)si.host); }	302	bool can (const sockinfo &si) { return can((u32)si.host); }
248	bool can (u32 host);	303	bool can (u32 host);
249	};	304	};
250		305
251	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	306	static net_rate_limiter auth_rate_limiter, reset_rate_limiter;
252		307
		308	bool
253	bool net_rate_limiter::can (u32 host)	309	net_rate_limiter::can (u32 host)
254	{	310	{
255	iterator i;	311	iterator i;
256		312
257	for (i = begin (); i != end (); )	313	for (i = begin (); i != end (); )
258	if (i->host == host)	314	if (i->host == host)
…		…
303	}	359	}
304	}	360	}
305		361
306	/////////////////////////////////////////////////////////////////////////////	362	/////////////////////////////////////////////////////////////////////////////
307		363
308	unsigned char hmac_packet::hmac_digest[EVP_MAX_MD_SIZE];	364	void
309
310	void hmac_packet::hmac_gen (crypto_ctx *ctx)	365	hmac_packet::hmac_gen (crypto_ctx ctx, u8 hmac_digest)
311	{	366	{
312	unsigned int xlen;
313
314	HMAC_CTX *hctx = &ctx->hctx;	367	HMAC_CTX *hctx = &ctx->hctx;
315		368
316	HMAC_Init_ex (hctx, 0, 0, 0, 0);	369	require (HMAC_Init_ex (hctx, 0, 0, 0, 0));
317	HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet),	370	require (HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), len - sizeof (hmac_packet)));
318	len - sizeof (hmac_packet));	371	require (HMAC_Final (hctx, hmac_digest, 0));
319	HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen);
320	}	372	}
321		373
322	void	374	void
323	hmac_packet::hmac_set (crypto_ctx *ctx)	375	hmac_packet::hmac_set (crypto_ctx *ctx)
324	{	376	{
325	hmac_gen (ctx);	377	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
326		378	hmac_gen (ctx, hmac_digest);
327	memcpy (hmac, hmac_digest, HMACLENGTH);	379	memcpy (hmac, hmac_digest, HMACLENGTH);
328	}	380	}
329		381
330	bool	382	bool
331	hmac_packet::hmac_chk (crypto_ctx *ctx)	383	hmac_packet::hmac_chk (crypto_ctx *ctx)
332	{	384	{
333	hmac_gen (ctx);	385	unsigned char hmac_digest[EVP_MAX_MD_SIZE];
334		386	hmac_gen (ctx, hmac_digest);
335	return !memcmp (hmac, hmac_digest, HMACLENGTH);	387	return !memcmp (hmac, hmac_digest, HMACLENGTH);
336	}	388	}
337		389
		390	void
338	void vpn_packet::set_hdr (ptype type_, unsigned int dst)	391	vpn_packet::set_hdr (ptype type_, unsigned int dst)
339	{	392	{
340	type = type_;	393	type = type_;
341		394
342	int src = THISNODE->id;	395	int src = THISNODE->id;
343		396
…		…
348		401
349	#define MAXVPNDATA (MAX_MTU - 6 - 6)	402	#define MAXVPNDATA (MAX_MTU - 6 - 6)
350	#define DATAHDR (sizeof (u32) + RAND_SIZE)	403	#define DATAHDR (sizeof (u32) + RAND_SIZE)
351		404
352	struct vpndata_packet : vpn_packet	405	struct vpndata_packet : vpn_packet
		406	{
		407	u8 data[MAXVPNDATA + DATAHDR]; // seqno
		408
		409	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
		410	tap_packet unpack (connection conn, u32 &seqno);
		411
		412	private:
		413	const u32 data_hdr_size () const
353	{	414	{
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;	415	return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR;
363	}
364	};	416	}
		417	};
365		418
366	void	419	void
367	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)	420	vpndata_packet::setup (connection conn, int dst, u8 d, u32 l, u32 seqno)
368	{	421	{
369	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;	422	EVP_CIPHER_CTX *cctx = &conn->octx->cctx;
…		…
371	ptype type = PT_DATA_UNCOMPRESSED;	424	ptype type = PT_DATA_UNCOMPRESSED;
372		425
373	#if ENABLE_COMPRESSION	426	#if ENABLE_COMPRESSION
374	u8 cdata[MAX_MTU];	427	u8 cdata[MAX_MTU];
375		428
376	if (conn->features & ENABLE_COMPRESSION)	429	if (conn->features & FEATURE_COMPRESSION)
377	{	430	{
378	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	431	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
379		432
380	if (cl)	433	if (cl)
381	{	434	{
…		…
387	d[1] = cl;	440	d[1] = cl;
388	}	441	}
389	}	442	}
390	#endif	443	#endif
391		444
392	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));	445	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 1));
393		446
394	struct {	447	struct {
395	#if RAND_SIZE	448	#if RAND_SIZE
396	u8 rnd[RAND_SIZE];	449	u8 rnd[RAND_SIZE];
397	#endif	450	#endif
398	u32 seqno;	451	u32 seqno;
399	} datahdr;	452	} datahdr;
400		453
401	datahdr.seqno = ntohl (seqno);	454	datahdr.seqno = ntohl (seqno);
402	#if RAND_SIZE	455	#if RAND_SIZE
403	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	456	// NB: a constant (per session) random prefix
		457	// is likely enough, but we don't take any chances.
		458	conn->oiv.get (datahdr.rnd, RAND_SIZE);
404	#endif	459	#endif
405		460
406	require (EVP_EncryptUpdate (cctx,	461	require (EVP_EncryptUpdate (cctx,
407	(unsigned char *) data + outl, &outl2,	462	(unsigned char *) data + outl, &outl2,
408	(unsigned char *) &datahdr, DATAHDR));	463	(unsigned char *) &datahdr, DATAHDR));
…		…
430	int outl = 0, outl2;	485	int outl = 0, outl2;
431	tap_packet *p = new tap_packet;	486	tap_packet *p = new tap_packet;
432	u8 *d;	487	u8 *d;
433	u32 l = len - data_hdr_size ();	488	u32 l = len - data_hdr_size ();
434		489
435	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));	490	require (EVP_CipherInit_ex (cctx, 0, 0, 0, 0, 0));
436		491
437	#if ENABLE_COMPRESSION	492	#if ENABLE_COMPRESSION
438	u8 cdata[MAX_MTU];	493	u8 cdata[MAX_MTU];
439		494
440	if (type == PT_DATA_COMPRESSED)	495	if (type == PT_DATA_COMPRESSED)
441	d = cdata;	496	d = cdata;
442	else	497	else
443	#endif	498	#endif
444	d = &(*p)[6 + 6 - DATAHDR];	499	d = &(*p)[6 + 6] - DATAHDR;
445		500
446	/* this overwrites part of the src mac, but we fix that later */	501	// we play do evil games with the struct layout atm.
		502	// pending better solutions, we at least do some verification.
		503	// this is fine, as we left ISO territory long ago.
		504	require (DATAHDR <= 16);
		505	require ((u8 )(&p->len + 1) == &(p)[0]);
		506
		507	// this can overwrite the len/dst/src fields
447	require (EVP_DecryptUpdate (cctx,	508	require (EVP_DecryptUpdate (cctx,
448	d, &outl2,	509	d, &outl2,
449	(unsigned char *)&data, len - data_hdr_size ()));	510	(unsigned char *)&data, len - data_hdr_size ()));
450	outl += outl2;	511	outl += outl2;
451		512
…		…
482	}	543	}
483	};	544	};
484		545
485	struct config_packet : vpn_packet	546	struct config_packet : vpn_packet
486	{	547	{
487	// actually, hmaclen cannot be checked because the hmac	548	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;	549	u8 prot_major, prot_minor, randsize;
491	u8 flags, challengelen, features, pad3;	550	u8 flags, features, pad6, pad7, pad8;
492	u32 cipher_nid, digest_nid, hmac_nid;	551	u32 cipher_nid, mac_nid, auth_nid;
493		552
494	void setup (ptype type, int dst);	553	void setup (ptype type, int dst);
495	bool chk_config () const;	554	bool chk_config (const conf_node *conf, const sockinfo &rsi) const;
496		555
497	static u8 get_features ()	556	static u8 get_features ()
498	{	557	{
499	u8 f = 0;	558	u8 f = 0;
500	#if ENABLE_COMPRESSION	559	#if ENABLE_COMPRESSION
…		…
508	#endif	567	#endif
509	return f;	568	return f;
510	}	569	}
511	};	570	};
512		571
		572	void
513	void config_packet::setup (ptype type, int dst)	573	config_packet::setup (ptype type, int dst)
514	{	574	{
515	prot_major = PROTOCOL_MAJOR;	575	prot_major = PROTOCOL_MAJOR;
516	prot_minor = PROTOCOL_MINOR;	576	prot_minor = PROTOCOL_MINOR;
517	randsize = RAND_SIZE;	577	randsize = RAND_SIZE;
518	hmaclen = HMACLENGTH;
519	flags = 0;	578	flags = 0;
520	challengelen = sizeof (rsachallenge);
521	features = get_features ();	579	features = get_features ();
522		580
		581	strncpy ((char *)serial, conf.serial, sizeof (serial));
		582
523	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	583	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER ()));
524	digest_nid = htonl (EVP_MD_type (RSA_HASH));
525	hmac_nid = htonl (EVP_MD_type (DIGEST));	584	mac_nid = htonl (EVP_MD_type (MAC_DIGEST ()));
		585	auth_nid = htonl (EVP_MD_type (AUTH_DIGEST ()));
526		586
527	len = sizeof (*this) - sizeof (net_packet);	587	len = sizeof (*this) - sizeof (net_packet);
528	set_hdr (type, dst);	588	set_hdr (type, dst);
529	}	589	}
530		590
531	bool config_packet::chk_config () const	591	bool
		592	config_packet::chk_config (const conf_node *conf, const sockinfo &rsi) const
532	{	593	{
533	if (prot_major != PROTOCOL_MAJOR)	594	if (prot_major != PROTOCOL_MAJOR)
534	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);	595	slog (L_WARN, _("%s(%s): major version mismatch (remote %d <=> local %d)"),
		596	conf->nodename, (const char *)rsi, prot_major, PROTOCOL_MAJOR);
535	else if (randsize != RAND_SIZE)	597	else if (randsize != RAND_SIZE)
536	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);	598	slog (L_WARN, _("%s(%s): rand size mismatch (remote %d <=> local %d)"),
537	else if (hmaclen != HMACLENGTH)	599	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)))	600	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));	601	slog (L_WARN, _("%s(%s): cipher algo mismatch (remote %x <=> local %x)"),
543	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	602	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)))	603	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));	604	slog (L_WARN, _("%s(%s): mac algo mismatch (remote %x <=> local %x)"),
		605	conf->nodename, (const char *)rsi, ntohl (mac_nid), EVP_MD_type (MAC_DIGEST ()));
		606	else if (auth_nid != htonl (EVP_MD_type (AUTH_DIGEST ())))
		607	slog (L_WARN, _("%s(%s): auth algo mismatch (remote %x <=> local %x)"),
		608	conf->nodename, (const char *)rsi, ntohl (auth_nid), EVP_MD_type (AUTH_DIGEST ()));
547	else	609	else
		610	{
		611	int cmp = memcmp (serial, ::conf.serial, sizeof (serial));
		612
		613	if (cmp > 0)
		614	slog (L_WARN, _("%s(%s): remote serial newer than local serial - outdated config?"),
		615	conf->nodename, (const char *)rsi);
		616	else if (cmp == 0)
548	return true;	617	return true;
		618	}
549		619
550	return false;	620	return false;
551	}	621	}
552		622
553	struct auth_req_packet : config_packet	623	struct auth_req_packet : config_packet // UNPROTECTED
554	{	624	{
555	char magic[8];	625	char magic[8];
556	u8 initiate; // false if this is just an automatic reply	626	u8 initiate; // false if this is just an automatic reply
557	u8 protocols; // supported protocols (will be patched on forward)	627	u8 protocols; // supported protocols (will be patched on forward)
558	u8 pad2, pad3;	628	u8 pad2, pad3;
559	rsaid id;	629	auth_encr encr;
560	rsaencrdata encr;
561		630
562	auth_req_packet (int dst, bool initiate_, u8 protocols_)	631	auth_req_packet (int dst, bool initiate_, u8 protocols_)
563	{	632	{
564	config_packet::setup (PT_AUTH_REQ, dst);	633	config_packet::setup (PT_AUTH_REQ, dst);
565	strncpy (magic, MAGIC, 8);	634	memcpy (magic, MAGIC, 8);
566	initiate = !!initiate_;	635	initiate = !!initiate_;
567	protocols = protocols_;	636	protocols = protocols_;
568		637
569	len = sizeof (*this) - sizeof (net_packet);	638	len = sizeof (*this) - sizeof (net_packet);
570	}	639	}
571	};	640	};
572		641
573	struct auth_res_packet : config_packet	642	struct auth_res_packet : vpn_packet // UNPROTECTED
574	{	643	{
575	rsaid id;
576	u8 pad1, pad2, pad3;
577	u8 response_len; // encrypted length
578	rsaresponse response;	644	auth_response response;
579		645
580	auth_res_packet (int dst)	646	auth_res_packet (int dst)
581	{	647	{
582	config_packet::setup (PT_AUTH_RES, dst);	648	set_hdr (PT_AUTH_RES, dst);
583		649
584	len = sizeof (*this) - sizeof (net_packet);	650	len = sizeof (*this) - sizeof (net_packet);
585	}	651	}
586	};	652	};
587		653
…		…
617	};	683	};
618		684
619	/////////////////////////////////////////////////////////////////////////////	685	/////////////////////////////////////////////////////////////////////////////
620		686
621	void	687	void
622	connection::connection_established ()	688	connection::connection_established (const sockinfo &rsi)
623	{	689	{
624	slog (L_TRACE, _("%s: possible connection establish (ictx %d, octx %d)"), conf->nodename, !!ictx, !!octx);	690	if (!have_snd_auth \|\| !have_rcv_auth)
		691	return;
625		692
		693	si = rsi;
		694	protocol = rsi.prot;
		695
		696	slog (L_INFO, _("%s(%s): connection established (%s), protocol version %d.%d."),
		697	conf->nodename, (const char *)rsi,
		698	is_direct ? "direct" : "forwarded",
		699	PROTOCOL_MAJOR, prot_minor);
		700
		701	if (::conf.script_node_up)
		702	{
		703	run_script_cb *cb = new run_script_cb;
		704	cb->set<connection, &connection::script_node_up> (this);
		705	run_script_queued (cb, _("node-up command execution failed, continuing."));
		706	}
		707
		708	delete ictx; ictx = new crypto_ctx (rcv_auth, snd_auth, rcv_ecdh_a, rcv_auth.ecdh, 0);
		709	iseqno.reset (ntohl (rcv_auth.rsa.seqno) & 0x7fffffff);
		710
		711	delete octx; octx = new crypto_ctx (snd_auth, rcv_auth, snd_ecdh_a, snd_ecdh_b , 1);
		712	oseqno = ntohl (snd_auth.rsa.seqno) & 0x7fffffff;
		713
		714	oiv.reset ();
		715
		716	// make sure rekeying timeouts are slightly asymmetric
		717	ev::tstamp rekey_interval = ::conf.rekey + (conf->id > THISNODE->id ? 10 : 0);
		718	rekey.start (rekey_interval, rekey_interval);
		719
		720	keepalive.start (::conf.keepalive);
		721
		722	// send queued packets
626	if (ictx && octx)	723	if (ictx && octx)
627	{	724	{
628	// make sure rekeying timeouts are slightly asymmetric	725	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	{	726	{
636	while (tap_packet p = (tap_packet )data_queue.get ())
637	{
638	if (p->len) send_data_packet (p);	727	if (p->len) send_data_packet (p);
639	delete p;	728	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	}	729	}
		730
		731	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		732	{
		733	if (p->len) send_vpn_packet (p, si, IPTOS_RELIABILITY);
		734	delete p;
		735	}
648	}	736	}
		737
		738	vpn->connection_established (this);
		739	}
		740
		741	void
		742	connection::reset_si ()
		743	{
		744	if (vpn->can_direct (THISNODE, conf))
		745	protocol = best_protocol (THISNODE->protocols & conf->connectable_protocols ());
649	else	746	else
650	{	747	{
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);	748	slog (L_TRACE, _("%s: direct connection denied by config."), conf->nodename);
673	protocol = 0;	749	protocol = 0;
674	}	750	}
675		751
676	si.set (conf, protocol);	752	si.set (conf, protocol);
		753
		754	is_direct = si.valid ();
677	}	755	}
678		756
679	// ensure sockinfo is valid, forward if necessary	757	// ensure sockinfo is valid, forward if necessary
680	const sockinfo &	758	const sockinfo &
681	connection::forward_si (const sockinfo &si) const	759	connection::forward_si (const sockinfo &si) const
682	{	760	{
683	if (!si.valid ())	761	if (!si.valid ())
684	{	762	{
685	connection *r = vpn->find_router ();	763	connection *r = vpn->find_router_for (this);
686		764
687	if (r)	765	if (r)
688	{	766	{
689	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),	767	slog (L_DEBUG, _("%s: no common protocol, trying to route through %s."),
690	conf->nodename, r->conf->nodename, (const char *)r->si);	768	conf->nodename, r->conf->nodename);
691	return r->si;	769	return r->si;
692	}	770	}
693	else	771	else
694	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	772	slog (L_DEBUG, _("%s: node unreachable, no common protocol or no router available."),
695	conf->nodename);	773	conf->nodename);
696	}	774	}
697		775
698	return si;	776	return si;
699	}	777	}
…		…
709	connection::send_ping (const sockinfo &si, u8 pong)	787	connection::send_ping (const sockinfo &si, u8 pong)
710	{	788	{
711	ping_packet *pkt = new ping_packet;	789	ping_packet *pkt = new ping_packet;
712		790
713	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);	791	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		792
		793	slog (L_TRACE, "%s << %s [%s]", conf->nodename, pong ? "PT_PONG" : "PT_PING", (const char *)si);
714	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);	794	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
715		795
716	delete pkt;	796	delete pkt;
717	}	797	}
718		798
…		…
733	void	813	void
734	connection::send_auth_request (const sockinfo &si, bool initiate)	814	connection::send_auth_request (const sockinfo &si, bool initiate)
735	{	815	{
736	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	816	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
737		817
738	rsachallenge chg;	818	generate_auth_data ();
739	rsa_cache.gen (pkt->id, chg);
740	rsa_encrypt (conf->rsa_key, chg, pkt->encr);	819	auth_encrypt (conf->rsa_key, snd_auth, pkt->encr);
741		820
742	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	821	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	822	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
745		823
746	delete pkt;	824	delete pkt;
747	}	825	}
748		826
749	void	827	void
750	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	828	connection::send_auth_response (const sockinfo &si)
751	{	829	{
752	auth_res_packet *pkt = new auth_res_packet (conf->id);	830	auth_res_packet *pkt = new auth_res_packet (conf->id);
753		831
754	pkt->id = id;	832	memcpy (pkt->response.ecdh, rcv_ecdh_b, sizeof rcv_ecdh_b);
		833	auth_hash (rcv_auth, rcv_ecdh_b, pkt->response.mac);
755		834
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);	835	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	836	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly
763		837
764	delete pkt;	838	delete pkt;
765	}	839	}
766		840
767	void	841	void
768	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)	842	connection::send_connect_info (int rid, const sockinfo &rsi, u8 rprotocols)
769	{	843	{
770	slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)",	844	slog (L_TRACE, "%s << PT_CONNECT_INFO(%s,%s,p%02x)", conf->nodename,
771	conf->id, rid, (const char *)rsi);	845	vpn->conns[rid - 1]->conf->nodename, (const char *)rsi,
		846	conf->protocols);
772		847
773	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);	848	connect_info_packet *r = new connect_info_packet (conf->id, rid, rsi, rprotocols);
774		849
775	r->hmac_set (octx);	850	r->hmac_set (octx);
776	send_vpn_packet (r, si);	851	send_vpn_packet (r, si);
…		…
779	}	854	}
780		855
781	inline void	856	inline void
782	connection::establish_connection_cb (ev::timer &w, int revents)	857	connection::establish_connection_cb (ev::timer &w, int revents)
783	{	858	{
784	if (!ictx	859	if (!(ictx && octx)
785	&& conf != THISNODE	860	&& conf != THISNODE
786	&& connectmode != conf_node::C_NEVER	861	&& connectmode != conf_node::C_NEVER
787	&& connectmode != conf_node::C_DISABLED	862	&& connectmode != conf_node::C_DISABLED
788	&& !w.is_active ())	863	&& !w.is_active ())
789	{	864	{
…		…
793	{	868	{
794	reset_connection ();	869	reset_connection ();
795	return;	870	return;
796	}	871	}
797		872
		873	last_establish_attempt = ev_now ();
		874
798	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3	875	ev::tstamp retry_int = ev::tstamp (retry_cnt & 3
799	? (retry_cnt & 3) + 1	876	? (retry_cnt & 3) + 1
800	: 1 << (retry_cnt >> 2));	877	: 1 << (retry_cnt >> 2));
801		878
802	reset_si ();	879	reset_si ();
803		880
804	bool slow = si.prot & PROT_SLOW;	881	bool slow = si.prot & PROT_SLOW;
805		882
806	if (si.prot && !si.host)	883	if (si.prot && !si.host && vpn->can_direct (THISNODE, conf))
807	{	884	{
808	slog (L_TRACE, _("%s: connection request (indirect)"), conf->nodename);
809	/TODO/ /* start the timer so we don't recurse endlessly */	885	/TODO/ /* start the timer so we don't recurse endlessly */
810	w.start (1);	886	w.start (1);
811	vpn->send_connect_request (conf->id);	887	vpn->send_connect_request (this);
812	}	888	}
813	else	889	else
814	{	890	{
815	slog (L_TRACE, _("%s: connection request (direct)"), conf->nodename, !!ictx, !!octx);	891	if (si.valid ())
		892	slog (L_DEBUG, _("%s: sending direct connection request to %s."),
		893	conf->nodename, (const char *)si);
816		894
817	const sockinfo &dsi = forward_si (si);	895	const sockinfo &dsi = forward_si (si);
818		896
819	slow = slow \|\| (dsi.prot & PROT_SLOW);	897	slow = slow \|\| (dsi.prot & PROT_SLOW);
820		898
…		…
825	else	903	else
826	send_ping (dsi, 0);	904	send_ping (dsi, 0);
827	}	905	}
828	}	906	}
829		907
830	retry_int *= slow ? 8. : 0.7;	908	retry_int *= slow ? 8. : 0.9;
831		909
832	if (retry_int < conf->max_retry)	910	if (retry_int < conf->max_retry)
833	retry_cnt++;	911	retry_cnt++;
834	else	912	else
835	retry_int = conf->max_retry;	913	retry_int = conf->max_retry;
…		…
846	slog (L_INFO, _("%s(%s): connection lost"),	924	slog (L_INFO, _("%s(%s): connection lost"),
847	conf->nodename, (const char *)si);	925	conf->nodename, (const char *)si);
848		926
849	if (::conf.script_node_down)	927	if (::conf.script_node_down)
850	{	928	{
851	run_script_cb cb;	929	run_script_cb *cb = new run_script_cb;
852	cb.set<connection, &connection::script_node_down> (this);	930	cb->set<connection, &connection::script_node_down> (this);
853	if (!run_script (cb, false))
854	slog (L_WARN, _("node-down command execution failed, continuing."));	931	run_script_queued (cb, _("node-down command execution failed, continuing."));
855	}	932	}
856	}	933	}
857		934
858	delete ictx; ictx = 0;	935	delete ictx; ictx = 0;
859	delete octx; octx = 0;	936	delete octx; octx = 0;
860	#if ENABLE_DNS
861	dnsv4_reset_connection ();
862	#endif
863		937
864	si.host = 0;	938	si.host = 0;
865		939
		940	have_snd_auth = false;
		941	have_rcv_auth = false;
		942	auth_expire = 0.;
		943
866	last_activity = 0;	944	last_activity = 0.;
		945	//last_si_change = 0.;
867	retry_cnt = 0;	946	retry_cnt = 0;
868		947
869	rekey.stop ();	948	rekey.stop ();
870	keepalive.stop ();	949	keepalive.stop ();
871	establish_connection.stop ();	950	establish_connection.stop ();
…		…
878	send_reset (si);	957	send_reset (si);
879		958
880	reset_connection ();	959	reset_connection ();
881	}	960	}
882		961
		962	// poor-man's rekeying
883	inline void	963	inline void
884	connection::rekey_cb (ev::timer &w, int revents)	964	connection::rekey_cb (ev::timer &w, int revents)
885	{	965	{
886	reset_connection ();	966	reset_connection ();
887	establish_connection ();	967	establish_connection ();
…		…
905	if (oseqno > MAX_SEQNO)	985	if (oseqno > MAX_SEQNO)
906	rekey ();	986	rekey ();
907	}	987	}
908		988
909	void	989	void
		990	connection::post_inject_queue ()
		991	{
		992	// force a connection every now and when when packets are sent (max 1/s)
		993	if (ev_now () - last_establish_attempt >= 0.95) // arbitrary
		994	establish_connection.stop ();
		995
		996	establish_connection ();
		997	}
		998
		999	void
910	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)	1000	connection::inject_data_packet (tap_packet *pkt)
911	{	1001	{
912	if (ictx && octx)	1002	if (ictx && octx)
913	send_data_packet (pkt);	1003	send_data_packet (pkt);
914	else	1004	else
915	{	1005	{
916	if (!broadcast)
917	data_queue.put (new tap_packet (*pkt));	1006	data_queue.put (new tap_packet (*pkt));
918		1007	post_inject_queue ();
919	establish_connection ();
920	}	1008	}
921	}	1009	}
922		1010
		1011	void
923	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)	1012	connection::inject_vpn_packet (vpn_packet *pkt, int tos)
924	{	1013	{
925	if (ictx && octx)	1014	if (ictx && octx)
926	send_vpn_packet (pkt, si, tos);	1015	send_vpn_packet (pkt, si, tos);
927	else	1016	else
928	{	1017	{
929	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));	1018	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
930		1019	post_inject_queue ();
931	establish_connection ();
932	}	1020	}
933	}	1021	}
934		1022
935	void	1023	void
936	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)	1024	connection::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi)
937	{	1025	{
938	last_activity = ev_now ();	1026	last_activity = ev_now ();
939		1027
940	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	1028	slog (L_NOISE, "%s >> received packet type %d from %d to %d.",
941	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	1029	conf->nodename, pkt->typ (), pkt->src (), pkt->dst ());
942		1030
943	if (connectmode == conf_node::C_DISABLED)	1031	if (connectmode == conf_node::C_DISABLED)
944	return;	1032	return;
945		1033
946	switch (pkt->typ ())	1034	switch (pkt->typ ())
947	{	1035	{
948	case vpn_packet::PT_PING:	1036	case vpn_packet::PT_PING:
		1037	slog (L_TRACE, "%s >> PT_PING", conf->nodename);
		1038
949	// we send pings instead of auth packets after some retries,	1039	// we send pings instead of auth packets after some retries,
950	// so reset the retry counter and establish a connection	1040	// so reset the retry counter and establish a connection
951	// when we receive a ping.	1041	// when we receive a ping.
952	if (!ictx)	1042	if (!ictx)
953	{	1043	{
954	if (auth_rate_limiter.can (rsi))	1044	if (auth_rate_limiter.can (rsi))
955	send_auth_request (rsi, true);	1045	send_auth_request (rsi, true);
956	}	1046	}
957	else	1047	else
		1048	// we would love to change the socket address here, but ping's aren't
		1049	// authenticated, so we best ignore it.
958	send_ping (rsi, 1); // pong	1050	send_ping (rsi, 1); // pong
959		1051
960	break;	1052	break;
961		1053
962	case vpn_packet::PT_PONG:	1054	case vpn_packet::PT_PONG:
		1055	slog (L_TRACE, "%s >> PT_PONG", conf->nodename);
		1056
		1057	// a PONG might mean that the other side doesn't really know
		1058	// about our desire for communication.
		1059	establish_connection ();
963	break;	1060	break;
964		1061
965	case vpn_packet::PT_RESET:	1062	case vpn_packet::PT_RESET:
966	{	1063	{
967	reset_connection ();	1064	reset_connection ();
968		1065
969	config_packet p = (config_packet ) pkt;	1066	config_packet p = (config_packet ) pkt;
970		1067
971	if (!p->chk_config ())	1068	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 ();	1069	establish_connection ();
979	}	1070	}
980	break;	1071	break;
981		1072
982	case vpn_packet::PT_AUTH_REQ:	1073	case vpn_packet::PT_AUTH_REQ:
983	if (auth_rate_limiter.can (rsi))	1074	if (auth_rate_limiter.can (rsi))
984	{	1075	{
985	auth_req_packet p = (auth_req_packet ) pkt;	1076	auth_req_packet p = (auth_req_packet )pkt;
986		1077
987	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	1078	slog (L_TRACE, "%s >> PT_AUTH_REQ(%s,p%02x,f%02x)",
		1079	conf->nodename, p->initiate ? "initiate" : "reply",
		1080	p->protocols, p->features);
988		1081
989	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	1082	if (memcmp (p->magic, MAGIC, 8))
		1083	{
		1084	slog (L_WARN, _("%s(%s): protocol magic mismatch - stray packet?"),
		1085	conf->nodename, (const char *)rsi);
		1086	}
		1087	else if (p->chk_config (conf, rsi))
990	{	1088	{
991	if (p->prot_minor != PROTOCOL_MINOR)	1089	if (p->prot_minor != PROTOCOL_MINOR)
992	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	1090	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
993	conf->nodename, (const char *)rsi,	1091	conf->nodename, (const char *)rsi,
994	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	1092	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
995		1093
996	if (p->initiate)	1094	if (p->initiate)
997	send_auth_request (rsi, false);	1095	send_auth_request (rsi, false);
998		1096
999	rsachallenge k;	1097	auth_data auth;
1000		1098
1001	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))	1099	if (!auth_decrypt (::conf.rsa_key, p->encr, auth))
1002	{	1100	{
1003	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	1101	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));	1102	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
1005	break;
1006	}	1103	}
1007	else	1104	else
1008	{	1105	{
1009	delete octx;	1106	bool chg = !have_rcv_auth \|\| memcmp (&rcv_auth, &auth, sizeof auth);
1010		1107
1011	octx = new crypto_ctx (k, 1);	1108	rcv_auth = auth;
1012	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	1109	have_rcv_auth = true;
1013		1110
		1111	send_auth_response (rsi);
		1112
		1113	if (chg)
		1114	{
1014	conf->protocols = p->protocols;	1115	conf->protocols = p->protocols;
1015	features = p->features & config_packet::get_features ();	1116	features = p->features & config_packet::get_features ();
1016		1117
1017	send_auth_response (rsi, p->id, k);
1018
1019	connection_established ();	1118	connection_established (rsi);
1020
1021	break;	1119	}
1022	}	1120	}
		1121
		1122	break;
1023	}	1123	}
1024	else
1025	slog (L_WARN, _("%s(%s): protocol mismatch"),
1026	conf->nodename, (const char *)rsi);
1027		1124
1028	send_reset (rsi);	1125	send_reset (rsi);
1029	}	1126	}
1030		1127
1031	break;	1128	break;
1032		1129
1033	case vpn_packet::PT_AUTH_RES:	1130	case vpn_packet::PT_AUTH_RES:
1034	{	1131	{
1035	auth_res_packet p = (auth_res_packet ) pkt;	1132	auth_res_packet p = (auth_res_packet )pkt;
1036		1133
1037	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1134	slog (L_TRACE, "%s >> PT_AUTH_RES", conf->nodename);
1038		1135
1039	if (p->chk_config ())	1136	auth_mac local_mac;
		1137	auth_hash (snd_auth, p->response.ecdh, local_mac);
		1138
		1139	if (memcmp (&p->response.mac, local_mac, sizeof local_mac))
1040	{	1140	{
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"),	1141	slog (L_ERR, _("%s(%s): unrequested or outdated auth response, ignoring."),
1051	conf->nodename, (const char *)rsi);	1142	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	}	1143	}
		1144	else if (!have_snd_auth)
		1145	{
		1146	memcpy (snd_ecdh_b, p->response.ecdh, sizeof snd_ecdh_b);
		1147
		1148	have_snd_auth = true;
		1149	connection_established (rsi);
		1150	}
		1151
		1152	break;
1106	}	1153	}
1107		1154
1108	send_reset (rsi);	1155	send_reset (rsi);
1109	break;	1156	break;
1110		1157
…		…
1120	{	1167	{
1121	vpndata_packet p = (vpndata_packet )pkt;	1168	vpndata_packet p = (vpndata_packet )pkt;
1122		1169
1123	if (!p->hmac_chk (ictx))	1170	if (!p->hmac_chk (ictx))
1124	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1171	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1125	"could be an attack, or just corruption or a synchronization error"),	1172	"could be an attack, or just corruption or a synchronization error."),
1126	conf->nodename, (const char *)rsi);	1173	conf->nodename, (const char *)rsi);
1127	else	1174	else
1128	{	1175	{
1129	u32 seqno;	1176	u32 seqno;
1130	tap_packet *d = p->unpack (this, seqno);	1177	tap_packet *d = p->unpack (this, seqno);
		1178	int seqclass = iseqno.seqno_classify (seqno);
1131		1179
1132	if (iseqno.recv_ok (seqno))	1180	if (seqclass == 0) // ok
1133	{	1181	{
1134	vpn->tap->send (d);	1182	vpn->tap->send (d);
1135		1183
1136	if (si != rsi)	1184	if (si != rsi)
1137	{	1185	{
1138	// fast re-sync on source address changes, useful especially for tcp/ip	1186	// fast re-sync on source address changes, useful especially for tcp/ip
		1187	//if (last_si_change < ev_now () + 5.)
1139	si = rsi;	1188	// {
1140
1141	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1189	slog (L_INFO, _("%s(%s): changing socket address to %s."),
1142	conf->nodename, (const char )si, (const char )rsi);	1190	conf->nodename, (const char )si, (const char )rsi);
		1191
		1192	si = rsi;
		1193
		1194	if (::conf.script_node_change)
		1195	{
		1196	run_script_cb *cb = new run_script_cb;
		1197	cb->set<connection, &connection::script_node_change> (this);
		1198	run_script_queued (cb, _("node-change command execution failed, continuing."));
		1199	}
		1200
		1201	// }
		1202	//else
		1203	// slog (L_INFO, _("%s(%s): accepted packet from %s, not (yet) redirecting traffic."),
		1204	// conf->nodename, (const char )si, (const char )rsi);
1143	}	1205	}
		1206	}
		1207	else if (seqclass == 1) // far history
		1208	slog (L_ERR, _("received very old packet (received %08lx, expected %08lx). "
		1209	"possible replay attack, or just packet duplication/delay, ignoring."), seqno, iseqno.seq + 1);
		1210	else if (seqclass == 2) // in-window duplicate, happens often on wireless
		1211	slog (L_DEBUG, _("received recent duplicated packet (received %08lx, expected %08lx). "
		1212	"possible replay attack, or just packet duplication, ignoring."), seqno, iseqno.seq + 1);
		1213	else if (seqclass == 3) // reset
		1214	{
		1215	slog (L_ERR, _("received out-of-sync (far future) packet (received %08lx, expected %08lx). "
		1216	"probably just massive packet loss, sending reset."), seqno, iseqno.seq + 1);
		1217	send_reset (rsi);
1144	}	1218	}
1145		1219
1146	delete d;	1220	delete d;
1147	break;	1221	break;
1148	}	1222	}
…		…
1152	break;	1226	break;
1153		1227
1154	case vpn_packet::PT_CONNECT_REQ:	1228	case vpn_packet::PT_CONNECT_REQ:
1155	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1229	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1156	{	1230	{
1157	connect_req_packet p = (connect_req_packet ) pkt;	1231	connect_req_packet p = (connect_req_packet )pkt;
1158		1232
1159	if (p->id > 0 && p->id <= vpn->conns.size ())	1233	if (p->id > 0 && p->id <= vpn->conns.size ())
1160	{	1234	{
1161	connection *c = vpn->conns[p->id - 1];	1235	connection *c = vpn->conns[p->id - 1];
1162	conf->protocols = p->protocols;	1236	conf->protocols = p->protocols;
1163		1237
1164	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]",	1238	slog (L_TRACE, "%s >> PT_CONNECT_REQ(%s,p%02x) [%d]",
		1239	conf->nodename, vpn->conns[p->id - 1]->conf->nodename,
		1240	p->protocols,
1165	conf->id, p->id, c->ictx && c->octx);	1241	c->ictx && c->octx);
1166		1242
1167	if (c->ictx && c->octx)	1243	if (c->ictx && c->octx)
1168	{	1244	{
1169	// send connect_info packets to both sides, in case one is	1245	// send connect_info packets to both sides, in case one is
1170	// behind a nat firewall (or both ;)	1246	// behind a nat firewall (or both ;)
…		…
1193		1269
1194	c->conf->protocols = p->protocols;	1270	c->conf->protocols = p->protocols;
1195	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1271	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1196	p->si.upgrade_protocol (protocol, c->conf);	1272	p->si.upgrade_protocol (protocol, c->conf);
1197		1273
1198	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1274	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);	1275	conf->nodename,
		1276	vpn->conns[p->id - 1]->conf->nodename,
		1277	(const char *)p->si,
		1278	p->protocols,
		1279	protocol,
		1280	p->si.supported_protocols (c->conf),
		1281	!c->ictx && !c->octx);
1200		1282
1201	const sockinfo &dsi = forward_si (p->si);	1283	const sockinfo &dsi = forward_si (p->si);
1202		1284
1203	if (dsi.valid ())	1285	if (dsi.valid ())
1204	c->send_auth_request (dsi, true);	1286	c->send_auth_request (dsi, true);
		1287	else
		1288	slog (L_INFO, "connect info for %s received (%s), but still unable to contact.",
		1289	vpn->conns[p->id - 1]->conf->nodename,
		1290	(const char *)p->si);
1205	}	1291	}
1206	else	1292	else
1207	slog (L_WARN,	1293	slog (L_WARN,
1208	_("received authenticated connection request from unknown node #%d, config file mismatch?"),	1294	_("received authenticated connection request from unknown node #%d, config file mismatch?"),
1209	p->id);	1295	p->id);
…		…
1218	}	1304	}
1219		1305
1220	inline void	1306	inline void
1221	connection::keepalive_cb (ev::timer &w, int revents)	1307	connection::keepalive_cb (ev::timer &w, int revents)
1222	{	1308	{
1223	if (ev_now () >= last_activity + ::conf.keepalive + 30)	1309	ev_tstamp when = last_activity + ::conf.keepalive - ev::now ();
		1310
		1311	if (when >= 0)
		1312	w.start (when);
		1313	else if (when < -15)
1224	{	1314	{
1225	reset_connection ();	1315	reset_connection ();
1226	establish_connection ();	1316	establish_connection ();
1227	}	1317	}
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	1318	else if (conf->connectmode != conf_node::C_ONDEMAND
1231	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1319	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1232	{	1320	{
		1321	w.start (3);
1233	send_ping (si);	1322	send_ping (si);
1234	w.start (5);
1235	}	1323	}
1236	else if (ev_now () < last_activity + ::conf.keepalive + 10)	1324	else if (when >= -10)
1237	// hold ondemand connections implicitly a few seconds longer	1325	// hold ondemand connections implicitly a few seconds longer
1238	// should delete octx, though, or something like that ;)	1326	// should delete octx, though, or something like that ;)
1239	w.start (last_activity + ::conf.keepalive + 10 - ev::now ());	1327	w.start (when + 10);
1240	else	1328	else
1241	reset_connection ();	1329	reset_connection ();
1242	}	1330	}
1243		1331
		1332	void
1244	void connection::send_connect_request (int id)	1333	connection::send_connect_request (int id)
1245	{	1334	{
1246	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1335	connect_req_packet *p = new connect_req_packet (conf->id, id, THISNODE->protocols);
1247		1336
1248	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1337	slog (L_TRACE, "%s << PT_CONNECT_REQ(%s,p%02x)",
		1338	conf->nodename, vpn->conns[id - 1]->conf->nodename,
		1339	THISNODE->protocols);
1249	p->hmac_set (octx);	1340	p->hmac_set (octx);
1250	send_vpn_packet (p, si);	1341	send_vpn_packet (p, si);
1251		1342
1252	delete p;	1343	delete p;
1253	}	1344	}
1254		1345
		1346	void
1255	void connection::script_init_env (const char *ext)	1347	connection::script_init_env (const char *ext)
1256	{	1348	{
1257	char *env;	1349	char *env;
1258	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);	1350	asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1259	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);	1351	asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1260	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,	1352	asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1261	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,	1353	0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1262	conf->id & 0xff); putenv (env);	1354	conf->id & 0xff); putenv (env);
1263	}	1355	}
1264		1356
		1357	void
1265	void connection::script_init_connect_env ()	1358	connection::script_init_connect_env ()
1266	{	1359	{
1267	vpn->script_init_env ();	1360	vpn->script_init_env ();
1268		1361
1269	char *env;	1362	char *env;
1270	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1363	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
		1364	asprintf (&env, "DESTSI=%s", (const char *)si); putenv (env);
1271	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1365	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1272	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1366	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1273	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1367	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1274	}	1368	}
1275		1369
1276	inline const char *	1370	inline const char *
1277	connection::script_node_up ()	1371	connection::script_node_up ()
1278	{	1372	{
…		…
1288		1382
1289	return filename;	1383	return filename;
1290	}	1384	}
1291		1385
1292	inline const char *	1386	inline const char *
		1387	connection::script_node_change ()
		1388	{
		1389	script_init_connect_env ();
		1390
		1391	putenv ((char *)"STATE=change");
		1392
		1393	char *filename;
		1394	asprintf (&filename,
		1395	"%s/%s",
		1396	confbase,
		1397	::conf.script_node_change ? ::conf.script_node_change : "node-change");
		1398
		1399	return filename;
		1400	}
		1401
		1402	inline const char *
1293	connection::script_node_down ()	1403	connection::script_node_down ()
1294	{	1404	{
1295	script_init_connect_env ();	1405	script_init_connect_env ();
1296		1406
1297	putenv ((char *)"STATE=down");	1407	putenv ((char *)"STATE=down");
…		…
1308	connection::connection (struct vpn vpn, conf_node conf)	1418	connection::connection (struct vpn vpn, conf_node conf)
1309	: vpn(vpn), conf(conf),	1419	: vpn(vpn), conf(conf),
1310	#if ENABLE_DNS	1420	#if ENABLE_DNS
1311	dns (0),	1421	dns (0),
1312	#endif	1422	#endif
1313	data_queue(conf->max_ttl, conf->max_queue),	1423	data_queue(conf->max_ttl, conf->max_queue + 1),
1314	vpn_queue(conf->max_ttl, conf->max_queue)	1424	vpn_queue(conf->max_ttl, conf->max_queue + 1)
1315	{	1425	{
1316	rekey .set<connection, &connection::rekey_cb > (this);	1426	rekey .set<connection, &connection::rekey_cb > (this);
1317	keepalive .set<connection, &connection::keepalive_cb > (this);	1427	keepalive .set<connection, &connection::keepalive_cb > (this);
1318	establish_connection.set<connection, &connection::establish_connection_cb> (this);	1428	establish_connection.set<connection, &connection::establish_connection_cb> (this);
1319		1429
		1430	last_establish_attempt = 0.;
1320	octx = ictx = 0;	1431	octx = ictx = 0;
1321	retry_cnt = 0;
1322
1323	if (!conf->protocols) // make sure some protocol is enabled
1324	conf->protocols = PROT_UDPv4;
1325		1432
1326	connectmode = conf->connectmode;	1433	connectmode = conf->connectmode;
1327		1434
1328	// queue a dummy packet to force an initial connection attempt	1435	// queue a dummy packet to force an initial connection attempt
1329	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)	1436	if (connectmode != conf_node::C_ALWAYS && connectmode != conf_node::C_DISABLED)
1330	{	1437	vpn_queue.put (new net_packet);
1331	net_packet *p = new net_packet;
1332	p->len = 0;
1333	vpn_queue.put (p);
1334	}
1335		1438
1336	reset_connection ();	1439	reset_connection ();
1337	}	1440	}
1338		1441
1339	connection::~connection ()	1442	connection::~connection ()
1340	{	1443	{
1341	shutdown ();	1444	shutdown ();
1342	}	1445	}
1343		1446
		1447	void
1344	void connection_init ()	1448	connection_init ()
1345	{	1449	{
1346	auth_rate_limiter.clear ();	1450	auth_rate_limiter.clear ();
1347	reset_rate_limiter.clear ();	1451	reset_rate_limiter.clear ();
1348	}	1452	}
1349		1453

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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 1.104 by root, Fri Jul 19 18:18:27 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 1.104 by root, Fri Jul 19 18:18:27 2013 UTC