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

Comparing gvpe/src/connection.C (file contents):
Revision 1.14 by pcg, Fri Aug 8 09:29:22 2003 UTC vs.
Revision 1.47 by pcg, Mon Mar 7 01:31:26 2005 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		4
		5	This file is part of GVPE.
		6
4	This program is free software; you can redistribute it and/or modify	7	GVPE is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	8	it under the terms of the GNU General Public License as published by
6	the Free Software Foundation; either version 2 of the License, or	9	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	10	(at your option) any later version.
8		11
9	This program is distributed in the hope that it will be useful,	12	This program is distributed in the hope that it will be useful,
10	but WITHOUT ANY WARRANTY; without even the implied warranty of	13	but WITHOUT ANY WARRANTY; without even the implied warranty of
11	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the	14	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12	GNU General Public License for more details.	15	GNU General Public License for more details.
13		16
14	You should have received a copy of the GNU General Public License	17	You should have received a copy of the GNU General Public License
15	along with this program; if not, write to the Free Software	18	along with gvpe; if not, write to the Free Software
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	19	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	20	*/
18		21
19	#include "config.h"	22	#include "config.h"
20		23
21	extern "C" {	24	#include <cassert>
22	# include "lzf/lzf.h"
23	}
24		25
25	#include <list>	26	#include <list>
26		27
27	#include <openssl/rand.h>	28	#include <openssl/rand.h>
28	#include <openssl/evp.h>	29	#include <openssl/evp.h>
35	#include "slog.h"	36	#include "slog.h"
36	#include "device.h"	37	#include "device.h"
37	#include "vpn.h"	38	#include "vpn.h"
38	#include "connection.h"	39	#include "connection.h"
39		40
		41	#include "netcompat.h"
		42
40	#if !HAVE_RAND_PSEUDO_BYTES	43	#if !HAVE_RAND_PSEUDO_BYTES
41	# define RAND_pseudo_bytes RAND_bytes	44	# define RAND_pseudo_bytes RAND_bytes
42	#endif	45	#endif
43		46
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	47	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
45		48
		49	#define ULTRA_FAST 1
		50	#define HLOG 15
		51	#include "lzf/lzf.h"
		52	#include "lzf/lzf_c.c"
		53	#include "lzf/lzf_d.c"
		54
46	struct crypto_ctx	55	struct crypto_ctx
47	{	56	{
48	EVP_CIPHER_CTX cctx;	57	EVP_CIPHER_CTX cctx;
49	HMAC_CTX hctx;	58	HMAC_CTX hctx;
50		59
…		…
53	};	62	};
54		63
55	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	64	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
56	{	65	{
57	EVP_CIPHER_CTX_init (&cctx);	66	EVP_CIPHER_CTX_init (&cctx);
58	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	67	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
59	HMAC_CTX_init (&hctx);	68	HMAC_CTX_init (&hctx);
60	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	69	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
61	}	70	}
62		71
63	crypto_ctx::~crypto_ctx ()	72	crypto_ctx::~crypto_ctx ()
64	{	73	{
65	EVP_CIPHER_CTX_cleanup (&cctx);	74	require (EVP_CIPHER_CTX_cleanup (&cctx));
66	HMAC_CTX_cleanup (&hctx);	75	HMAC_CTX_cleanup (&hctx);
67	}	76	}
68		77
69	static void	78	static void
70	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	79	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
71	{	80	{
72	EVP_MD_CTX ctx;	81	EVP_MD_CTX ctx;
73		82
74	EVP_MD_CTX_init (&ctx);	83	EVP_MD_CTX_init (&ctx);
75	EVP_DigestInit (&ctx, RSA_HASH);	84	require (EVP_DigestInit (&ctx, RSA_HASH));
76	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	85	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
77	EVP_DigestUpdate(&ctx, &id, sizeof id);	86	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
78	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	87	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
79	EVP_MD_CTX_cleanup (&ctx);	88	EVP_MD_CTX_cleanup (&ctx);
80	}	89	}
81		90
82	struct rsa_entry {	91	struct rsa_entry {
83	tstamp expire;	92	tstamp expire;
…		…
131		140
132	} rsa_cache;	141	} rsa_cache;
133		142
134	void rsa_cache::cleaner_cb (time_watcher &w)	143	void rsa_cache::cleaner_cb (time_watcher &w)
135	{	144	{
136	if (empty ())	145	if (!empty ())
137	w.at = TSTAMP_CANCEL;
138	else
139	{	146	{
140	w.at = NOW + RSA_TTL;	147	w.start (NOW + RSA_TTL);
141		148
142	for (iterator i = begin (); i != end (); )	149	for (iterator i = begin (); i != end (); )
143	if (i->expire <= NOW)	150	if (i->expire <= NOW)
144	i = erase (i);	151	i = erase (i);
145	else	152	else
…		…
197	// only do action once every x seconds per host whole allowing bursts.	204	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	205	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	206	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	207	struct net_rate_limiter : list<net_rateinfo>
201	{	208	{
202	static const double ALPHA = 1. - 1. / 180.; // allow bursts	209	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
203	static const double CUTOFF = 10.; // one event every CUTOFF seconds	210	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	211	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	212	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
206		213
207	bool can (const sockinfo &si) { return can((u32)si.host); }	214	bool can (const sockinfo &si) { return can((u32)si.host); }
208	bool can (u32 host);	215	bool can (u32 host);
209	};	216	};
210		217
211	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	218	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212		219
…		…
215	iterator i;	222	iterator i;
216		223
217	for (i = begin (); i != end (); )	224	for (i = begin (); i != end (); )
218	if (i->host == host)	225	if (i->host == host)
219	break;	226	break;
220	else if (i->last < NOW - EXPIRE)	227	else if (i->last < NOW - NRL_EXPIRE)
221	i = erase (i);	228	i = erase (i);
222	else	229	else
223	i++;	230	i++;
224		231
225	if (i == end ())	232	if (i == end ())
226	{	233	{
227	net_rateinfo ri;	234	net_rateinfo ri;
228		235
229	ri.host = host;	236	ri.host = host;
230	ri.pcnt = 1.;	237	ri.pcnt = 1.;
231	ri.diff = MAXDIF;	238	ri.diff = NRL_MAXDIF;
232	ri.last = NOW;	239	ri.last = NOW;
233		240
234	push_front (ri);	241	push_front (ri);
235		242
236	return true;	243	return true;
…		…
238	else	245	else
239	{	246	{
240	net_rateinfo ri (*i);	247	net_rateinfo ri (*i);
241	erase (i);	248	erase (i);
242		249
243	ri.pcnt = ri.pcnt * ALPHA;	250	ri.pcnt = ri.pcnt * NRL_ALPHA;
244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	251	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
245		252
246	ri.last = NOW;	253	ri.last = NOW;
247		254
248	double dif = ri.diff / ri.pcnt;	255	double dif = ri.diff / ri.pcnt;
249		256
250	bool send = dif > CUTOFF;	257	bool send = dif > NRL_CUTOFF;
251		258
252	if (dif > MAXDIF)	259	if (dif > NRL_MAXDIF)
253	{	260	{
254	ri.pcnt = 1.;	261	ri.pcnt = 1.;
255	ri.diff = MAXDIF;	262	ri.diff = NRL_MAXDIF;
256	}	263	}
257	else if (send)	264	else if (send)
258	ri.pcnt++;	265	ri.pcnt++;
259		266
260	push_front (ri);	267	push_front (ri);
…		…
307	}	314	}
308		315
309	#define MAXVPNDATA (MAX_MTU - 6 - 6)	316	#define MAXVPNDATA (MAX_MTU - 6 - 6)
310	#define DATAHDR (sizeof (u32) + RAND_SIZE)	317	#define DATAHDR (sizeof (u32) + RAND_SIZE)
311		318
312	struct vpndata_packet:vpn_packet	319	struct vpndata_packet : vpn_packet
313	{	320	{
314	u8 data[MAXVPNDATA + DATAHDR]; // seqno	321	u8 data[MAXVPNDATA + DATAHDR]; // seqno
315		322
316	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	323	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
317	tap_packet unpack (connection conn, u32 &seqno);	324	tap_packet unpack (connection conn, u32 &seqno);
…		…
330	int outl = 0, outl2;	337	int outl = 0, outl2;
331	ptype type = PT_DATA_UNCOMPRESSED;	338	ptype type = PT_DATA_UNCOMPRESSED;
332		339
333	#if ENABLE_COMPRESSION	340	#if ENABLE_COMPRESSION
334	u8 cdata[MAX_MTU];	341	u8 cdata[MAX_MTU];
335	u32 cl;
336		342
		343	if (conn->features & ENABLE_COMPRESSION)
		344	{
337	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	345	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		346
338	if (cl)	347	if (cl)
339	{	348	{
340	type = PT_DATA_COMPRESSED;	349	type = PT_DATA_COMPRESSED;
341	d = cdata;	350	d = cdata;
342	l = cl + 2;	351	l = cl + 2;
343		352
344	d[0] = cl >> 8;	353	d[0] = cl >> 8;
345	d[1] = cl;	354	d[1] = cl;
		355	}
346	}	356	}
347	#endif	357	#endif
348		358
349	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	359	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
350		360
351	struct {	361	struct {
352	#if RAND_SIZE	362	#if RAND_SIZE
353	u8 rnd[RAND_SIZE];	363	u8 rnd[RAND_SIZE];
354	#endif	364	#endif
…		…
358	datahdr.seqno = ntohl (seqno);	368	datahdr.seqno = ntohl (seqno);
359	#if RAND_SIZE	369	#if RAND_SIZE
360	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	370	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
361	#endif	371	#endif
362		372
363	EVP_EncryptUpdate (cctx,	373	require (EVP_EncryptUpdate (cctx,
364	(unsigned char *) data + outl, &outl2,	374	(unsigned char *) data + outl, &outl2,
365	(unsigned char *) &datahdr, DATAHDR);	375	(unsigned char *) &datahdr, DATAHDR));
366	outl += outl2;	376	outl += outl2;
367		377
368	EVP_EncryptUpdate (cctx,	378	require (EVP_EncryptUpdate (cctx,
369	(unsigned char *) data + outl, &outl2,	379	(unsigned char *) data + outl, &outl2,
370	(unsigned char *) d, l);	380	(unsigned char *) d, l));
371	outl += outl2;	381	outl += outl2;
372		382
373	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	383	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
374	outl += outl2;	384	outl += outl2;
375		385
376	len = outl + data_hdr_size ();	386	len = outl + data_hdr_size ();
377		387
378	set_hdr (type, dst);	388	set_hdr (type, dst);
…		…
387	int outl = 0, outl2;	397	int outl = 0, outl2;
388	tap_packet *p = new tap_packet;	398	tap_packet *p = new tap_packet;
389	u8 *d;	399	u8 *d;
390	u32 l = len - data_hdr_size ();	400	u32 l = len - data_hdr_size ();
391		401
392	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	402	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
393		403
394	#if ENABLE_COMPRESSION	404	#if ENABLE_COMPRESSION
395	u8 cdata[MAX_MTU];	405	u8 cdata[MAX_MTU];
396		406
397	if (type == PT_DATA_COMPRESSED)	407	if (type == PT_DATA_COMPRESSED)
…		…
399	else	409	else
400	#endif	410	#endif
401	d = &(*p)[6 + 6 - DATAHDR];	411	d = &(*p)[6 + 6 - DATAHDR];
402		412
403	/* this overwrites part of the src mac, but we fix that later */	413	/* this overwrites part of the src mac, but we fix that later */
404	EVP_DecryptUpdate (cctx,	414	require (EVP_DecryptUpdate (cctx,
405	d, &outl2,	415	d, &outl2,
406	(unsigned char *)&data, len - data_hdr_size ());	416	(unsigned char *)&data, len - data_hdr_size ()));
407	outl += outl2;	417	outl += outl2;
408		418
409	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	419	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
410	outl += outl2;	420	outl += outl2;
411		421
412	seqno = ntohl ((u32 )(d + RAND_SIZE));	422	seqno = ntohl ((u32 )(d + RAND_SIZE));
413		423
414	id2mac (dst () ? dst() : THISNODE->id, p->dst);	424	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
443	{	453	{
444	// actually, hmaclen cannot be checked because the hmac	454	// actually, hmaclen cannot be checked because the hmac
445	// field comes before this data, so peers with other	455	// field comes before this data, so peers with other
446	// hmacs simply will not work.	456	// hmacs simply will not work.
447	u8 prot_major, prot_minor, randsize, hmaclen;	457	u8 prot_major, prot_minor, randsize, hmaclen;
448	u8 flags, challengelen, pad2, pad3;	458	u8 flags, challengelen, features, pad3;
449	u32 cipher_nid, digest_nid, hmac_nid;	459	u32 cipher_nid, digest_nid, hmac_nid;
450
451	const u8 curflags () const
452	{
453	return 0x80
454	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
455	}
456		460
457	void setup (ptype type, int dst);	461	void setup (ptype type, int dst);
458	bool chk_config () const;	462	bool chk_config () const;
		463
		464	static u8 get_features ()
		465	{
		466	u8 f = 0;
		467	#if ENABLE_COMPRESSION
		468	f \|= FEATURE_COMPRESSION;
		469	#endif
		470	#if ENABLE_ROHC
		471	f \|= FEATURE_ROHC;
		472	#endif
		473	return f;
		474	}
459	};	475	};
460		476
461	void config_packet::setup (ptype type, int dst)	477	void config_packet::setup (ptype type, int dst)
462	{	478	{
463	prot_major = PROTOCOL_MAJOR;	479	prot_major = PROTOCOL_MAJOR;
464	prot_minor = PROTOCOL_MINOR;	480	prot_minor = PROTOCOL_MINOR;
465	randsize = RAND_SIZE;	481	randsize = RAND_SIZE;
466	hmaclen = HMACLENGTH;	482	hmaclen = HMACLENGTH;
467	flags = curflags ();	483	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
468	challengelen = sizeof (rsachallenge);	484	challengelen = sizeof (rsachallenge);
		485	features = get_features ();
469		486
470	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
471	digest_nid = htonl (EVP_MD_type (RSA_HASH));	488	digest_nid = htonl (EVP_MD_type (RSA_HASH));
472	hmac_nid = htonl (EVP_MD_type (DIGEST));	489	hmac_nid = htonl (EVP_MD_type (DIGEST));
473		490
…		…
475	set_hdr (type, dst);	492	set_hdr (type, dst);
476	}	493	}
477		494
478	bool config_packet::chk_config () const	495	bool config_packet::chk_config () const
479	{	496	{
480	return prot_major == PROTOCOL_MAJOR	497	if (prot_major != PROTOCOL_MAJOR)
481	&& randsize == RAND_SIZE	498	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
482	&& hmaclen == HMACLENGTH	499	else if (randsize != RAND_SIZE)
483	&& flags == curflags ()	500	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
		501	else if (hmaclen != HMACLENGTH)
		502	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
		503	#if 0 // this implementation should handle all flag settings
		504	else if (flags != curflags ())
		505	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
		506	#endif
484	&& challengelen == sizeof (rsachallenge)	507	else if (challengelen != sizeof (rsachallenge))
		508	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
485	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	509	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		510	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
486	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	511	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		512	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
487	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	513	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		514	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		515	else
		516	return true;
		517
		518	return false;
488	}	519	}
489		520
490	struct auth_req_packet : config_packet	521	struct auth_req_packet : config_packet
491	{	522	{
492	char magic[8];	523	char magic[8];
493	u8 initiate; // false if this is just an automatic reply	524	u8 initiate; // false if this is just an automatic reply
494	u8 protocols; // supported protocols (will get patches on forward)	525	u8 protocols; // supported protocols (will be patched on forward)
495	u8 pad2, pad3;	526	u8 pad2, pad3;
496	rsaid id;	527	rsaid id;
497	rsaencrdata encr;	528	rsaencrdata encr;
498		529
499	auth_req_packet (int dst, bool initiate_, u8 protocols_)	530	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
560	{	591	{
561	if (ictx && octx)	592	if (ictx && octx)
562	{	593	{
563	connectmode = conf->connectmode;	594	connectmode = conf->connectmode;
564		595
		596	// make sure rekeying timeouts are slightly asymmetric
565	rekey.start (NOW + ::conf.rekey);	597	rekey.start (NOW + ::conf.rekey
		598	+ (conf->id > THISNODE->id ? 10 : 0));
566	keepalive.start (NOW + ::conf.keepalive);	599	keepalive.start (NOW + ::conf.keepalive);
567		600
568	// send queued packets	601	// send queued packets
569	if (ictx && octx)	602	if (ictx && octx)
570	{	603	{
…		…
583	}	616	}
584	else	617	else
585	{	618	{
586	retry_cnt = 0;	619	retry_cnt = 0;
587	establish_connection.start (NOW + 5);	620	establish_connection.start (NOW + 5);
588	keepalive.reset ();	621	keepalive.stop ();
589	rekey.reset ();	622	rekey.stop ();
590	}	623	}
591	}	624	}
592		625
593	void	626	void
594	connection::reset_si ()	627	connection::reset_si ()
…		…
596	protocol = best_protocol (THISNODE->protocols & conf->protocols);	629	protocol = best_protocol (THISNODE->protocols & conf->protocols);
597		630
598	// mask out protocols we cannot establish	631	// mask out protocols we cannot establish
599	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	632	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
600	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	633	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		634	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
601		635
602	si.set (conf, protocol);	636	si.set (conf, protocol);
603	}	637	}
604		638
605	// ensure sockinfo is valid, forward if necessary	639	// ensure sockinfo is valid, forward if necessary
…		…
610	{	644	{
611	connection *r = vpn->find_router ();	645	connection *r = vpn->find_router ();
612		646
613	if (r)	647	if (r)
614	{	648	{
615	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	649	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
616	conf->nodename, r->conf->nodename);	650	conf->nodename, r->conf->nodename, (const char *)r->si);
617	return r->si;	651	return r->si;
618	}	652	}
619	else	653	else
620	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	654	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
621	conf->nodename);	655	conf->nodename);
…		…
660	connection::send_auth_request (const sockinfo &si, bool initiate)	694	connection::send_auth_request (const sockinfo &si, bool initiate)
661	{	695	{
662	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	696	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
663		697
664	rsachallenge chg;	698	rsachallenge chg;
665
666	rsa_cache.gen (pkt->id, chg);	699	rsa_cache.gen (pkt->id, chg);
667		700	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
668	if (0 > RSA_public_encrypt (sizeof chg,
669	(unsigned char )&chg, (unsigned char )&pkt->encr,
670	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
671	fatal ("RSA_public_encrypt error");
672		701
673	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	702	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
674		703
675	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	704	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
676		705
…		…
710	}	739	}
711		740
712	void	741	void
713	connection::establish_connection_cb (time_watcher &w)	742	connection::establish_connection_cb (time_watcher &w)
714	{	743	{
715	if (ictx \|\| conf == THISNODE	744	if (!ictx
		745	&& conf != THISNODE
716	\|\| connectmode == conf_node::C_NEVER	746	&& connectmode != conf_node::C_NEVER
717	\|\| connectmode == conf_node::C_DISABLED)	747	&& connectmode != conf_node::C_DISABLED
718	w.at = TSTAMP_CANCEL;	748	&& NOW > w.at)
719	else if (w.at <= NOW)
720	{	749	{
721	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	750	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion
722		751
723	if (retry_int < 3600 * 8)	752	double retry_int = double (retry_cnt & 3
724	retry_cnt++;	753	? (retry_cnt & 3) + 1
725		754	: 1 << (retry_cnt >> 2));
726	w.at = NOW + retry_int;
727		755
728	reset_si ();	756	reset_si ();
		757
		758	bool slow = si.prot & PROT_SLOW;
729		759
730	if (si.prot && !si.host)	760	if (si.prot && !si.host)
731	vpn->send_connect_request (conf->id);	761	vpn->send_connect_request (conf->id);
732	else	762	else
733	{	763	{
734	const sockinfo &dsi = forward_si (si);	764	const sockinfo &dsi = forward_si (si);
		765
		766	slow = slow \|\| (dsi.prot & PROT_SLOW);
735		767
736	if (dsi.valid () && auth_rate_limiter.can (dsi))	768	if (dsi.valid () && auth_rate_limiter.can (dsi))
737	{	769	{
738	if (retry_cnt < 4)	770	if (retry_cnt < 4)
739	send_auth_request (dsi, true);	771	send_auth_request (dsi, true);
740	else	772	else
741	send_ping (dsi, 0);	773	send_ping (dsi, 0);
742	}	774	}
743	}	775	}
		776
		777	retry_int *= slow ? 3. : 0.7;
		778
		779	if (retry_int < conf->max_retry)
		780	retry_cnt++;
		781	else
		782	retry_int = conf->max_retry;
		783
		784	w.start (NOW + retry_int);
744	}	785	}
745	}	786	}
746		787
747	void	788	void
748	connection::reset_connection ()	789	connection::reset_connection ()
…		…
756	run_script (run_script_cb (this, &connection::script_node_down), false);	797	run_script (run_script_cb (this, &connection::script_node_down), false);
757	}	798	}
758		799
759	delete ictx; ictx = 0;	800	delete ictx; ictx = 0;
760	delete octx; octx = 0;	801	delete octx; octx = 0;
		802	#if ENABLE_DNS
		803	dnsv4_reset_connection ();
		804	#endif
761		805
762	si.host= 0;	806	si.host = 0;
763		807
764	last_activity = 0;	808	last_activity = 0;
765	retry_cnt = 0;	809	retry_cnt = 0;
766		810
767	rekey.reset ();	811	rekey.stop ();
768	keepalive.reset ();	812	keepalive.stop ();
769	establish_connection.reset ();	813	establish_connection.stop ();
770	}	814	}
771		815
772	void	816	void
773	connection::shutdown ()	817	connection::shutdown ()
774	{	818	{
…		…
779	}	823	}
780		824
781	void	825	void
782	connection::rekey_cb (time_watcher &w)	826	connection::rekey_cb (time_watcher &w)
783	{	827	{
784	w.at = TSTAMP_CANCEL;
785
786	reset_connection ();	828	reset_connection ();
787	establish_connection ();	829	establish_connection ();
788	}	830	}
789		831
790	void	832	void
791	connection::send_data_packet (tap_packet *pkt, bool broadcast)	833	connection::send_data_packet (tap_packet *pkt)
792	{	834	{
793	vpndata_packet *p = new vpndata_packet;	835	vpndata_packet *p = new vpndata_packet;
794	int tos = 0;	836	int tos = 0;
795		837
796	// I am not hilarious about peeking into packets, but so be it.	838	// I am not hilarious about peeking into packets, but so be it.
797	if (conf->inherit_tos	839	if (conf->inherit_tos && pkt->is_ipv4 ())
798	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
799	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
800	tos = (*pkt)[15] & IPTOS_TOS_MASK;	840	tos = (*pkt)[15] & IPTOS_TOS_MASK;
801		841
802	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	842	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
803	send_vpn_packet (p, si, tos);	843	send_vpn_packet (p, si, tos);
804		844
805	delete p;	845	delete p;
806		846
807	if (oseqno > MAX_SEQNO)	847	if (oseqno > MAX_SEQNO)
808	rekey ();	848	rekey ();
809	}	849	}
810		850
811	void	851	void
812	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	852	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
813	{	853	{
814	if (ictx && octx)	854	if (ictx && octx)
815	send_data_packet (pkt, broadcast);	855	send_data_packet (pkt);
816	else	856	else
817	{	857	{
818	if (!broadcast)//DDDD	858	if (!broadcast)//DDDD
819	data_queue.put (new tap_packet (*pkt));	859	data_queue.put (new tap_packet (*pkt));
820		860
…		…
826	{	866	{
827	if (ictx && octx)	867	if (ictx && octx)
828	send_vpn_packet (pkt, si, tos);	868	send_vpn_packet (pkt, si, tos);
829	else	869	else
830	{	870	{
831	vpn_queue.put (new vpn_packet (*pkt));	871	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
832		872
833	establish_connection ();	873	establish_connection ();
834	}	874	}
835	}	875	}
836		876
…		…
895	if (p->initiate)	935	if (p->initiate)
896	send_auth_request (rsi, false);	936	send_auth_request (rsi, false);
897		937
898	rsachallenge k;	938	rsachallenge k;
899		939
900	if (0 > RSA_private_decrypt (sizeof (p->encr),	940	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
901	(unsigned char )&p->encr, (unsigned char )&k,	941	{
902	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
903	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),	942	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
904	conf->nodename, (const char *)rsi);	943	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		944	break;
		945	}
905	else	946	else
906	{	947	{
907	delete octx;	948	delete octx;
908		949
909	octx = new crypto_ctx (k, 1);	950	octx = new crypto_ctx (k, 1);
910	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	951	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
911		952
		953	// compatibility code, remove when no longer required
		954	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
		955
912	conf->protocols = p->protocols;	956	conf->protocols = p->protocols;
		957	features = p->features & config_packet::get_features ();
913		958
914	send_auth_response (rsi, p->id, k);	959	send_auth_response (rsi, p->id, k);
915		960
916	connection_established ();	961	connection_established ();
917		962
918	break;	963	break;
919	}	964	}
920	}	965	}
		966	else
		967	slog (L_WARN, _("%s(%s): protocol mismatch"),
		968	conf->nodename, (const char *)rsi);
921		969
922	send_reset (rsi);	970	send_reset (rsi);
923	}	971	}
924		972
925	break;	973	break;
…		…
939		987
940	rsachallenge chg;	988	rsachallenge chg;
941		989
942	if (!rsa_cache.find (p->id, chg))	990	if (!rsa_cache.find (p->id, chg))
943	{	991	{
944	slog (L_ERR, _("%s(%s): unrequested auth response"),	992	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
945	conf->nodename, (const char *)rsi);	993	conf->nodename, (const char *)rsi);
946	break;	994	break;
947	}	995	}
948	else	996	else
949	{	997	{
950	crypto_ctx *cctx = new crypto_ctx (chg, 0);	998	crypto_ctx *cctx = new crypto_ctx (chg, 0);
951		999
952	if (!p->hmac_chk (cctx))	1000	if (!p->hmac_chk (cctx))
		1001	{
953	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1002	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
954	"could be an attack, or just corruption or an synchronization error"),	1003	"could be an attack, or just corruption or a synchronization error"),
955	conf->nodename, (const char *)rsi);	1004	conf->nodename, (const char *)rsi);
		1005	break;
		1006	}
956	else	1007	else
957	{	1008	{
958	rsaresponse h;	1009	rsaresponse h;
959		1010
960	rsa_hash (p->id, chg, h);	1011	rsa_hash (p->id, chg, h);
…		…
1006	{	1057	{
1007	vpndata_packet p = (vpndata_packet )pkt;	1058	vpndata_packet p = (vpndata_packet )pkt;
1008		1059
1009	if (!p->hmac_chk (ictx))	1060	if (!p->hmac_chk (ictx))
1010	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1061	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1011	"could be an attack, or just corruption or an synchronization error"),	1062	"could be an attack, or just corruption or a synchronization error"),
1012	conf->nodename, (const char *)rsi);	1063	conf->nodename, (const char *)rsi);
1013	else	1064	else
1014	{	1065	{
1015	u32 seqno;	1066	u32 seqno;
1016	tap_packet *d = p->unpack (this, seqno);	1067	tap_packet *d = p->unpack (this, seqno);
1017		1068
1018	if (iseqno.recv_ok (seqno))	1069	if (iseqno.recv_ok (seqno))
1019	{	1070	{
1020	vpn->tap->send (d);	1071	vpn->tap->send (d);
1021		1072
1022	if (p->dst () == 0) // re-broadcast
1023	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1024	{
1025	connection c = i;
1026
1027	if (c->conf != THISNODE && c->conf != conf)
1028	c->inject_data_packet (d);
1029	}
1030
1031	if (si != rsi)	1073	if (si != rsi)
1032	{	1074	{
1033	// fast re-sync on connection changes, useful especially for tcp/ip	1075	// fast re-sync on connection changes, useful especially for tcp/ip
1034	si = rsi;	1076	si = rsi;
1035		1077
1036	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1078	slog (L_INFO, _("%s(%s): socket address changed to %s"),
1037	conf->nodename, (const char )si, (const char )rsi);	1079	conf->nodename, (const char )si, (const char )rsi);
1038	}	1080	}
1039
1040	delete d;
1041
1042	break;
1043	}	1081	}
		1082
		1083	delete d;
		1084	break;
1044	}	1085	}
1045	}	1086	}
1046		1087
1047	send_reset (rsi);	1088	send_reset (rsi);
1048	break;	1089	break;
…		…
1073	break;	1114	break;
1074		1115
1075	case vpn_packet::PT_CONNECT_INFO:	1116	case vpn_packet::PT_CONNECT_INFO:
1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1117	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1077	{	1118	{
1078	connect_info_packet p = (connect_info_packet ) pkt;	1119	connect_info_packet p = (connect_info_packet )pkt;
1079		1120
1080	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1121	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything
1081		1122	{
1082	connection *c = vpn->conns[p->id - 1];	1123	connection *c = vpn->conns[p->id - 1];
1083		1124
1084	c->conf->protocols = p->protocols;	1125	c->conf->protocols = p->protocols;
1085	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1126	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1086	p->si.upgrade_protocol (protocol, c->conf);	1127	p->si.upgrade_protocol (protocol, c->conf);
1087		1128
1088	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1129	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1089	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1130	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1090		1131
1091	const sockinfo &dsi = forward_si (p->si);	1132	const sockinfo &dsi = forward_si (p->si);
1092		1133
1093	if (dsi.valid ())	1134	if (dsi.valid ())
1094	c->send_auth_request (dsi, true);	1135	c->send_auth_request (dsi, true);
		1136	}
1095	}	1137	}
1096		1138
1097	break;	1139	break;
1098		1140
1099	default:	1141	default:
…		…
1108	{	1150	{
1109	reset_connection ();	1151	reset_connection ();
1110	establish_connection ();	1152	establish_connection ();
1111	}	1153	}
1112	else if (NOW < last_activity + ::conf.keepalive)	1154	else if (NOW < last_activity + ::conf.keepalive)
1113	w.at = last_activity + ::conf.keepalive;	1155	w.start (last_activity + ::conf.keepalive);
1114	else if (conf->connectmode != conf_node::C_ONDEMAND	1156	else if (conf->connectmode != conf_node::C_ONDEMAND
1115	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1157	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1116	{	1158	{
1117	send_ping (si);	1159	send_ping (si);
1118	w.at = NOW + 5;	1160	w.start (NOW + 5);
1119	}	1161	}
1120	else if (NOW < last_activity + ::conf.keepalive + 10)	1162	else if (NOW < last_activity + ::conf.keepalive + 10)
1121	// hold ondemand connections implicitly a few seconds longer	1163	// hold ondemand connections implicitly a few seconds longer
1122	// should delete octx, though, or something like that ;)	1164	// should delete octx, though, or something like that ;)
1123	w.at = last_activity + ::conf.keepalive + 10;	1165	w.start (last_activity + ::conf.keepalive + 10);
1124	else	1166	else
1125	reset_connection ();	1167	reset_connection ();
1126	}	1168	}
1127		1169
1128	void connection::send_connect_request (int id)	1170	void connection::send_connect_request (int id)
…		…
1163	putenv ("STATE=down");	1205	putenv ("STATE=down");
1164		1206
1165	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1207	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1166	}	1208	}
1167		1209
1168	connection::connection(struct vpn *vpn_)	1210	connection::connection (struct vpn vpn, conf_node conf)
1169	: vpn(vpn_)	1211	: vpn(vpn), conf(conf)
1170	, rekey (this, &connection::rekey_cb)	1212	, rekey (this, &connection::rekey_cb)
1171	, keepalive (this, &connection::keepalive_cb)	1213	, keepalive (this, &connection::keepalive_cb)
1172	, establish_connection (this, &connection::establish_connection_cb)	1214	, establish_connection (this, &connection::establish_connection_cb)
		1215	#if ENABLE_DNS
		1216	, dns (0)
		1217	#endif
1173	{	1218	{
1174	octx = ictx = 0;	1219	octx = ictx = 0;
1175	retry_cnt = 0;	1220	retry_cnt = 0;
1176		1221
		1222	if (!conf->protocols) // make sure some protocol is enabled
		1223	conf->protocols = PROT_UDPv4;
		1224
1177	connectmode = conf_node::C_ALWAYS; // initial setting	1225	connectmode = conf_node::C_ALWAYS; // initial setting
1178	reset_connection ();	1226	reset_connection ();
1179	}	1227	}
1180		1228
1181	connection::~connection ()	1229	connection::~connection ()

Diff Legend

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Comparing gvpe/src/connection.C (file contents): Revision 1.14 by pcg, Fri Aug 8 09:29:22 2003 UTC vs. Revision 1.47 by pcg, Mon Mar 7 01:31:26 2005 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.14 by pcg, Fri Aug 8 09:29:22 2003 UTC vs.
Revision 1.47 by pcg, Mon Mar 7 01:31:26 2005 UTC