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

Comparing gvpe/src/connection.C (file contents):
Revision 1.21 by pcg, Thu Oct 16 02:28:36 2003 UTC vs.
Revision 1.50 by pcg, Fri Mar 18 01:53:05 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>
29	#include <openssl/rsa.h>	30	#include <openssl/rsa.h>
30	#include <openssl/err.h>	31	#include <openssl/err.h>
31
32	#include "gettext.h"
33		32
34	#include "conf.h"	33	#include "conf.h"
35	#include "slog.h"	34	#include "slog.h"
36	#include "device.h"	35	#include "device.h"
37	#include "vpn.h"	36	#include "vpn.h"
43	# define RAND_pseudo_bytes RAND_bytes	42	# define RAND_pseudo_bytes RAND_bytes
44	#endif	43	#endif
45		44
46	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
47		46
		47	#define ULTRA_FAST 1
		48	#define HLOG 15
		49	#include "lzf/lzf.h"
		50	#include "lzf/lzf_c.c"
		51	#include "lzf/lzf_d.c"
		52
48	struct crypto_ctx	53	struct crypto_ctx
49	{	54	{
50	EVP_CIPHER_CTX cctx;	55	EVP_CIPHER_CTX cctx;
51	HMAC_CTX hctx;	56	HMAC_CTX hctx;
52		57
…		…
55	};	60	};
56		61
57	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
58	{	63	{
59	EVP_CIPHER_CTX_init (&cctx);	64	EVP_CIPHER_CTX_init (&cctx);
60	EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc);	65	require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc));
61	HMAC_CTX_init (&hctx);	66	HMAC_CTX_init (&hctx);
62	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);	67	HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0);
63	}	68	}
64		69
65	crypto_ctx::~crypto_ctx ()	70	crypto_ctx::~crypto_ctx ()
66	{	71	{
67	EVP_CIPHER_CTX_cleanup (&cctx);	72	require (EVP_CIPHER_CTX_cleanup (&cctx));
68	HMAC_CTX_cleanup (&hctx);	73	HMAC_CTX_cleanup (&hctx);
69	}	74	}
70		75
71	static void	76	static void
72	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
73	{	78	{
74	EVP_MD_CTX ctx;	79	EVP_MD_CTX ctx;
75		80
76	EVP_MD_CTX_init (&ctx);	81	EVP_MD_CTX_init (&ctx);
77	EVP_DigestInit (&ctx, RSA_HASH);	82	require (EVP_DigestInit (&ctx, RSA_HASH));
78	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
79	EVP_DigestUpdate(&ctx, &id, sizeof id);	84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
80	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
81	EVP_MD_CTX_cleanup (&ctx);	86	EVP_MD_CTX_cleanup (&ctx);
82	}	87	}
83		88
84	struct rsa_entry {	89	struct rsa_entry {
85	tstamp expire;	90	tstamp expire;
…		…
133		138
134	} rsa_cache;	139	} rsa_cache;
135		140
136	void rsa_cache::cleaner_cb (time_watcher &w)	141	void rsa_cache::cleaner_cb (time_watcher &w)
137	{	142	{
138	if (empty ())	143	if (!empty ())
139	w.at = TSTAMP_CANCEL;
140	else
141	{	144	{
142	w.at = NOW + RSA_TTL;	145	w.start (NOW + RSA_TTL);
143		146
144	for (iterator i = begin (); i != end (); )	147	for (iterator i = begin (); i != end (); )
145	if (i->expire <= NOW)	148	if (i->expire <= NOW)
146	i = erase (i);	149	i = erase (i);
147	else	150	else
…		…
199	// only do action once every x seconds per host whole allowing bursts.	202	// only do action once every x seconds per host whole allowing bursts.
200	// this implementation ("splay list" ;) is inefficient,	203	// this implementation ("splay list" ;) is inefficient,
201	// but low on resources.	204	// but low on resources.
202	struct net_rate_limiter : list<net_rateinfo>	205	struct net_rate_limiter : list<net_rateinfo>
203	{	206	{
204	static const double ALPHA = 1. - 1. / 600.; // allow bursts	207	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
205	static const double CUTOFF = 10.; // one event every CUTOFF seconds	208	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
206	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	209	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
207	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value	210	# define NRL_MAXDIF (NRL_CUTOFF * (1. / (1. - NRL_ALPHA))) // maximum diff /count value
208		211
209	bool can (const sockinfo &si) { return can((u32)si.host); }	212	bool can (const sockinfo &si) { return can((u32)si.host); }
210	bool can (u32 host);	213	bool can (u32 host);
211	};	214	};
212		215
…		…
217	iterator i;	220	iterator i;
218		221
219	for (i = begin (); i != end (); )	222	for (i = begin (); i != end (); )
220	if (i->host == host)	223	if (i->host == host)
221	break;	224	break;
222	else if (i->last < NOW - EXPIRE)	225	else if (i->last < NOW - NRL_EXPIRE)
223	i = erase (i);	226	i = erase (i);
224	else	227	else
225	i++;	228	i++;
226		229
227	if (i == end ())	230	if (i == end ())
228	{	231	{
229	net_rateinfo ri;	232	net_rateinfo ri;
230		233
231	ri.host = host;	234	ri.host = host;
232	ri.pcnt = 1.;	235	ri.pcnt = 1.;
233	ri.diff = MAXDIF;	236	ri.diff = NRL_MAXDIF;
234	ri.last = NOW;	237	ri.last = NOW;
235		238
236	push_front (ri);	239	push_front (ri);
237		240
238	return true;	241	return true;
…		…
240	else	243	else
241	{	244	{
242	net_rateinfo ri (*i);	245	net_rateinfo ri (*i);
243	erase (i);	246	erase (i);
244		247
245	ri.pcnt = ri.pcnt * ALPHA;	248	ri.pcnt = ri.pcnt * NRL_ALPHA;
246	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
247		250
248	ri.last = NOW;	251	ri.last = NOW;
249		252
250	double dif = ri.diff / ri.pcnt;	253	double dif = ri.diff / ri.pcnt;
251		254
252	bool send = dif > CUTOFF;	255	bool send = dif > NRL_CUTOFF;
253		256
254	if (dif > MAXDIF)	257	if (dif > NRL_MAXDIF)
255	{	258	{
256	ri.pcnt = 1.;	259	ri.pcnt = 1.;
257	ri.diff = MAXDIF;	260	ri.diff = NRL_MAXDIF;
258	}	261	}
259	else if (send)	262	else if (send)
260	ri.pcnt++;	263	ri.pcnt++;
261		264
262	push_front (ri);	265	push_front (ri);
…		…
309	}	312	}
310		313
311	#define MAXVPNDATA (MAX_MTU - 6 - 6)	314	#define MAXVPNDATA (MAX_MTU - 6 - 6)
312	#define DATAHDR (sizeof (u32) + RAND_SIZE)	315	#define DATAHDR (sizeof (u32) + RAND_SIZE)
313		316
314	struct vpndata_packet:vpn_packet	317	struct vpndata_packet : vpn_packet
315	{	318	{
316	u8 data[MAXVPNDATA + DATAHDR]; // seqno	319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
317		320
318	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);	321	void setup (connection conn, int dst, u8 d, u32 len, u32 seqno);
319	tap_packet unpack (connection conn, u32 &seqno);	322	tap_packet unpack (connection conn, u32 &seqno);
…		…
332	int outl = 0, outl2;	335	int outl = 0, outl2;
333	ptype type = PT_DATA_UNCOMPRESSED;	336	ptype type = PT_DATA_UNCOMPRESSED;
334		337
335	#if ENABLE_COMPRESSION	338	#if ENABLE_COMPRESSION
336	u8 cdata[MAX_MTU];	339	u8 cdata[MAX_MTU];
337	u32 cl;
338		340
		341	if (conn->features & ENABLE_COMPRESSION)
		342	{
339	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		344
340	if (cl)	345	if (cl)
341	{	346	{
342	type = PT_DATA_COMPRESSED;	347	type = PT_DATA_COMPRESSED;
343	d = cdata;	348	d = cdata;
344	l = cl + 2;	349	l = cl + 2;
345		350
346	d[0] = cl >> 8;	351	d[0] = cl >> 8;
347	d[1] = cl;	352	d[1] = cl;
		353	}
348	}	354	}
349	#endif	355	#endif
350		356
351	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
352		358
353	struct {	359	struct {
354	#if RAND_SIZE	360	#if RAND_SIZE
355	u8 rnd[RAND_SIZE];	361	u8 rnd[RAND_SIZE];
356	#endif	362	#endif
…		…
360	datahdr.seqno = ntohl (seqno);	366	datahdr.seqno = ntohl (seqno);
361	#if RAND_SIZE	367	#if RAND_SIZE
362	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
363	#endif	369	#endif
364		370
365	EVP_EncryptUpdate (cctx,	371	require (EVP_EncryptUpdate (cctx,
366	(unsigned char *) data + outl, &outl2,	372	(unsigned char *) data + outl, &outl2,
367	(unsigned char *) &datahdr, DATAHDR);	373	(unsigned char *) &datahdr, DATAHDR));
368	outl += outl2;	374	outl += outl2;
369		375
370	EVP_EncryptUpdate (cctx,	376	require (EVP_EncryptUpdate (cctx,
371	(unsigned char *) data + outl, &outl2,	377	(unsigned char *) data + outl, &outl2,
372	(unsigned char *) d, l);	378	(unsigned char *) d, l));
373	outl += outl2;	379	outl += outl2;
374		380
375	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	381	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
376	outl += outl2;	382	outl += outl2;
377		383
378	len = outl + data_hdr_size ();	384	len = outl + data_hdr_size ();
379		385
380	set_hdr (type, dst);	386	set_hdr (type, dst);
…		…
389	int outl = 0, outl2;	395	int outl = 0, outl2;
390	tap_packet *p = new tap_packet;	396	tap_packet *p = new tap_packet;
391	u8 *d;	397	u8 *d;
392	u32 l = len - data_hdr_size ();	398	u32 l = len - data_hdr_size ();
393		399
394	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
395		401
396	#if ENABLE_COMPRESSION	402	#if ENABLE_COMPRESSION
397	u8 cdata[MAX_MTU];	403	u8 cdata[MAX_MTU];
398		404
399	if (type == PT_DATA_COMPRESSED)	405	if (type == PT_DATA_COMPRESSED)
…		…
401	else	407	else
402	#endif	408	#endif
403	d = &(*p)[6 + 6 - DATAHDR];	409	d = &(*p)[6 + 6 - DATAHDR];
404		410
405	/* this overwrites part of the src mac, but we fix that later */	411	/* this overwrites part of the src mac, but we fix that later */
406	EVP_DecryptUpdate (cctx,	412	require (EVP_DecryptUpdate (cctx,
407	d, &outl2,	413	d, &outl2,
408	(unsigned char *)&data, len - data_hdr_size ());	414	(unsigned char *)&data, len - data_hdr_size ()));
409	outl += outl2;	415	outl += outl2;
410		416
411	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	417	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
412	outl += outl2;	418	outl += outl2;
413		419
414	seqno = ntohl ((u32 )(d + RAND_SIZE));	420	seqno = ntohl ((u32 )(d + RAND_SIZE));
415		421
416	id2mac (dst () ? dst() : THISNODE->id, p->dst);	422	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
445	{	451	{
446	// actually, hmaclen cannot be checked because the hmac	452	// actually, hmaclen cannot be checked because the hmac
447	// field comes before this data, so peers with other	453	// field comes before this data, so peers with other
448	// hmacs simply will not work.	454	// hmacs simply will not work.
449	u8 prot_major, prot_minor, randsize, hmaclen;	455	u8 prot_major, prot_minor, randsize, hmaclen;
450	u8 flags, challengelen, pad2, pad3;	456	u8 flags, challengelen, features, pad3;
451	u32 cipher_nid, digest_nid, hmac_nid;	457	u32 cipher_nid, digest_nid, hmac_nid;
452
453	const u8 curflags () const
454	{
455	return 0x80
456	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
457	}
458		458
459	void setup (ptype type, int dst);	459	void setup (ptype type, int dst);
460	bool chk_config () const;	460	bool chk_config () const;
		461
		462	static u8 get_features ()
		463	{
		464	u8 f = 0;
		465	#if ENABLE_COMPRESSION
		466	f \|= FEATURE_COMPRESSION;
		467	#endif
		468	#if ENABLE_ROHC
		469	f \|= FEATURE_ROHC;
		470	#endif
		471	return f;
		472	}
461	};	473	};
462		474
463	void config_packet::setup (ptype type, int dst)	475	void config_packet::setup (ptype type, int dst)
464	{	476	{
465	prot_major = PROTOCOL_MAJOR;	477	prot_major = PROTOCOL_MAJOR;
466	prot_minor = PROTOCOL_MINOR;	478	prot_minor = PROTOCOL_MINOR;
467	randsize = RAND_SIZE;	479	randsize = RAND_SIZE;
468	hmaclen = HMACLENGTH;	480	hmaclen = HMACLENGTH;
469	flags = curflags ();	481	flags = 0;
470	challengelen = sizeof (rsachallenge);	482	challengelen = sizeof (rsachallenge);
		483	features = get_features ();
471		484
472	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
473	digest_nid = htonl (EVP_MD_type (RSA_HASH));	486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
474	hmac_nid = htonl (EVP_MD_type (DIGEST));	487	hmac_nid = htonl (EVP_MD_type (DIGEST));
475		488
…		…
478	}	491	}
479		492
480	bool config_packet::chk_config () const	493	bool config_packet::chk_config () const
481	{	494	{
482	if (prot_major != PROTOCOL_MAJOR)	495	if (prot_major != PROTOCOL_MAJOR)
483	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);	496	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
484	else if (randsize != RAND_SIZE)	497	else if (randsize != RAND_SIZE)
485	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);	498	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
486	else if (hmaclen != HMACLENGTH)	499	else if (hmaclen != HMACLENGTH)
487	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);	500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
488	else if (flags != curflags ())
489	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
490	else if (challengelen != sizeof (rsachallenge))	501	else if (challengelen != sizeof (rsachallenge))
491	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));	502	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
492	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	503	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
493	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	504	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
494	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	505	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
495	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));	506	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
496	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	507	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
497	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	508	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
498	else	509	else
499	return true;	510	return true;
500		511
501	return false;	512	return false;
502	}	513	}
503		514
504	struct auth_req_packet : config_packet	515	struct auth_req_packet : config_packet
505	{	516	{
506	char magic[8];	517	char magic[8];
507	u8 initiate; // false if this is just an automatic reply	518	u8 initiate; // false if this is just an automatic reply
508	u8 protocols; // supported protocols (will get patches on forward)	519	u8 protocols; // supported protocols (will be patched on forward)
509	u8 pad2, pad3;	520	u8 pad2, pad3;
510	rsaid id;	521	rsaid id;
511	rsaencrdata encr;	522	rsaencrdata encr;
512		523
513	auth_req_packet (int dst, bool initiate_, u8 protocols_)	524	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
574	{	585	{
575	if (ictx && octx)	586	if (ictx && octx)
576	{	587	{
577	connectmode = conf->connectmode;	588	connectmode = conf->connectmode;
578		589
		590	// make sure rekeying timeouts are slightly asymmetric
579	rekey.start (NOW + ::conf.rekey);	591	rekey.start (NOW + ::conf.rekey
		592	+ (conf->id > THISNODE->id ? 10 : 0));
580	keepalive.start (NOW + ::conf.keepalive);	593	keepalive.start (NOW + ::conf.keepalive);
581		594
582	// send queued packets	595	// send queued packets
583	if (ictx && octx)	596	if (ictx && octx)
584	{	597	{
…		…
597	}	610	}
598	else	611	else
599	{	612	{
600	retry_cnt = 0;	613	retry_cnt = 0;
601	establish_connection.start (NOW + 5);	614	establish_connection.start (NOW + 5);
602	keepalive.reset ();	615	keepalive.stop ();
603	rekey.reset ();	616	rekey.stop ();
604	}	617	}
605	}	618	}
606		619
607	void	620	void
608	connection::reset_si ()	621	connection::reset_si ()
…		…
610	protocol = best_protocol (THISNODE->protocols & conf->protocols);	623	protocol = best_protocol (THISNODE->protocols & conf->protocols);
611		624
612	// mask out protocols we cannot establish	625	// mask out protocols we cannot establish
613	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	626	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
614	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	627	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		628	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
615		629
616	si.set (conf, protocol);	630	si.set (conf, protocol);
617	}	631	}
618		632
619	// ensure sockinfo is valid, forward if necessary	633	// ensure sockinfo is valid, forward if necessary
…		…
624	{	638	{
625	connection *r = vpn->find_router ();	639	connection *r = vpn->find_router ();
626		640
627	if (r)	641	if (r)
628	{	642	{
629	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),	643	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
630	conf->nodename, r->conf->nodename);	644	conf->nodename, r->conf->nodename, (const char *)r->si);
631	return r->si;	645	return r->si;
632	}	646	}
633	else	647	else
634	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),	648	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
635	conf->nodename);	649	conf->nodename);
…		…
674	connection::send_auth_request (const sockinfo &si, bool initiate)	688	connection::send_auth_request (const sockinfo &si, bool initiate)
675	{	689	{
676	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	690	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
677		691
678	rsachallenge chg;	692	rsachallenge chg;
679
680	rsa_cache.gen (pkt->id, chg);	693	rsa_cache.gen (pkt->id, chg);
681		694	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
682	if (0 > RSA_public_encrypt (sizeof chg,
683	(unsigned char )&chg, (unsigned char )&pkt->encr,
684	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
685	fatal ("RSA_public_encrypt error");
686		695
687	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	696	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
688		697
689	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	698	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
690		699
…		…
724	}	733	}
725		734
726	void	735	void
727	connection::establish_connection_cb (time_watcher &w)	736	connection::establish_connection_cb (time_watcher &w)
728	{	737	{
729	if (ictx \|\| conf == THISNODE	738	if (!ictx
		739	&& conf != THISNODE
730	\|\| connectmode == conf_node::C_NEVER	740	&& connectmode != conf_node::C_NEVER
731	\|\| connectmode == conf_node::C_DISABLED)	741	&& connectmode != conf_node::C_DISABLED
732	w.at = TSTAMP_CANCEL;	742	&& NOW > w.at)
733	else if (w.at <= NOW)
734	{	743	{
735	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	744	w.at = TSTAMP_MAX; // first disable this watcher in case of recursion
736		745
737	if (retry_int < 3600 * 8)	746	double retry_int = double (retry_cnt & 3
738	retry_cnt++;	747	? (retry_cnt & 3) + 1
739		748	: 1 << (retry_cnt >> 2));
740	w.at = NOW + retry_int;
741		749
742	reset_si ();	750	reset_si ();
		751
		752	bool slow = si.prot & PROT_SLOW;
743		753
744	if (si.prot && !si.host)	754	if (si.prot && !si.host)
745	vpn->send_connect_request (conf->id);	755	vpn->send_connect_request (conf->id);
746	else	756	else
747	{	757	{
748	const sockinfo &dsi = forward_si (si);	758	const sockinfo &dsi = forward_si (si);
		759
		760	slow = slow \|\| (dsi.prot & PROT_SLOW);
749		761
750	if (dsi.valid () && auth_rate_limiter.can (dsi))	762	if (dsi.valid () && auth_rate_limiter.can (dsi))
751	{	763	{
752	if (retry_cnt < 4)	764	if (retry_cnt < 4)
753	send_auth_request (dsi, true);	765	send_auth_request (dsi, true);
754	else	766	else
755	send_ping (dsi, 0);	767	send_ping (dsi, 0);
756	}	768	}
757	}	769	}
		770
		771	retry_int *= slow ? 8. : 0.7;
		772
		773	if (retry_int < conf->max_retry)
		774	retry_cnt++;
		775	else
		776	retry_int = conf->max_retry;
		777
		778	w.start (NOW + retry_int);
758	}	779	}
759	}	780	}
760		781
761	void	782	void
762	connection::reset_connection ()	783	connection::reset_connection ()
…		…
770	run_script (run_script_cb (this, &connection::script_node_down), false);	791	run_script (run_script_cb (this, &connection::script_node_down), false);
771	}	792	}
772		793
773	delete ictx; ictx = 0;	794	delete ictx; ictx = 0;
774	delete octx; octx = 0;	795	delete octx; octx = 0;
		796	#if ENABLE_DNS
		797	dnsv4_reset_connection ();
		798	#endif
775		799
776	si.host= 0;	800	si.host = 0;
777		801
778	last_activity = 0;	802	last_activity = 0;
779	retry_cnt = 0;	803	retry_cnt = 0;
780		804
781	rekey.reset ();	805	rekey.stop ();
782	keepalive.reset ();	806	keepalive.stop ();
783	establish_connection.reset ();	807	establish_connection.stop ();
784	}	808	}
785		809
786	void	810	void
787	connection::shutdown ()	811	connection::shutdown ()
788	{	812	{
…		…
793	}	817	}
794		818
795	void	819	void
796	connection::rekey_cb (time_watcher &w)	820	connection::rekey_cb (time_watcher &w)
797	{	821	{
798	w.at = TSTAMP_CANCEL;
799
800	reset_connection ();	822	reset_connection ();
801	establish_connection ();	823	establish_connection ();
802	}	824	}
803		825
804	void	826	void
…		…
838	{	860	{
839	if (ictx && octx)	861	if (ictx && octx)
840	send_vpn_packet (pkt, si, tos);	862	send_vpn_packet (pkt, si, tos);
841	else	863	else
842	{	864	{
843	vpn_queue.put (new vpn_packet (*pkt));	865	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
844		866
845	establish_connection ();	867	establish_connection ();
846	}	868	}
847	}	869	}
848		870
…		…
907	if (p->initiate)	929	if (p->initiate)
908	send_auth_request (rsi, false);	930	send_auth_request (rsi, false);
909		931
910	rsachallenge k;	932	rsachallenge k;
911		933
912	if (0 > RSA_private_decrypt (sizeof (p->encr),	934	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
913	(unsigned char )&p->encr, (unsigned char )&k,	935	{
914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	936	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	937	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		938	break;
		939	}
917	else	940	else
918	{	941	{
919	delete octx;	942	delete octx;
920		943
921	octx = new crypto_ctx (k, 1);	944	octx = new crypto_ctx (k, 1);
922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	945	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
923		946
924	conf->protocols = p->protocols;	947	conf->protocols = p->protocols;
		948	features = p->features & config_packet::get_features ();
925		949
926	send_auth_response (rsi, p->id, k);	950	send_auth_response (rsi, p->id, k);
927		951
928	connection_established ();	952	connection_established ();
929		953
…		…
965	crypto_ctx *cctx = new crypto_ctx (chg, 0);	989	crypto_ctx *cctx = new crypto_ctx (chg, 0);
966		990
967	if (!p->hmac_chk (cctx))	991	if (!p->hmac_chk (cctx))
968	{	992	{
969	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	993	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
970	"could be an attack, or just corruption or an synchronization error"),	994	"could be an attack, or just corruption or a synchronization error"),
971	conf->nodename, (const char *)rsi);	995	conf->nodename, (const char *)rsi);
972	break;	996	break;
973	}	997	}
974	else	998	else
975	{	999	{
…		…
1024	{	1048	{
1025	vpndata_packet p = (vpndata_packet )pkt;	1049	vpndata_packet p = (vpndata_packet )pkt;
1026		1050
1027	if (!p->hmac_chk (ictx))	1051	if (!p->hmac_chk (ictx))
1028	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1052	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1029	"could be an attack, or just corruption or an synchronization error"),	1053	"could be an attack, or just corruption or a synchronization error"),
1030	conf->nodename, (const char *)rsi);	1054	conf->nodename, (const char *)rsi);
1031	else	1055	else
1032	{	1056	{
1033	u32 seqno;	1057	u32 seqno;
1034	tap_packet *d = p->unpack (this, seqno);	1058	tap_packet *d = p->unpack (this, seqno);
…		…
1043	si = rsi;	1067	si = rsi;
1044		1068
1045	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1069	slog (L_INFO, _("%s(%s): socket address changed to %s"),
1046	conf->nodename, (const char )si, (const char )rsi);	1070	conf->nodename, (const char )si, (const char )rsi);
1047	}	1071	}
1048
1049	delete d;
1050
1051	break;
1052	}	1072	}
		1073
		1074	delete d;
		1075	break;
1053	}	1076	}
1054	}	1077	}
1055		1078
1056	send_reset (rsi);	1079	send_reset (rsi);
1057	break;	1080	break;
…		…
1082	break;	1105	break;
1083		1106
1084	case vpn_packet::PT_CONNECT_INFO:	1107	case vpn_packet::PT_CONNECT_INFO:
1085	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1108	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1086	{	1109	{
1087	connect_info_packet p = (connect_info_packet ) pkt;	1110	connect_info_packet p = (connect_info_packet )pkt;
1088		1111
1089	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1112	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything
1090		1113	{
1091	connection *c = vpn->conns[p->id - 1];	1114	connection *c = vpn->conns[p->id - 1];
1092		1115
1093	c->conf->protocols = p->protocols;	1116	c->conf->protocols = p->protocols;
1094	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1117	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1095	p->si.upgrade_protocol (protocol, c->conf);	1118	p->si.upgrade_protocol (protocol, c->conf);
1096		1119
1097	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1120	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1098	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1121	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1099		1122
1100	const sockinfo &dsi = forward_si (p->si);	1123	const sockinfo &dsi = forward_si (p->si);
1101		1124
1102	if (dsi.valid ())	1125	if (dsi.valid ())
1103	c->send_auth_request (dsi, true);	1126	c->send_auth_request (dsi, true);
		1127	}
1104	}	1128	}
1105		1129
1106	break;	1130	break;
1107		1131
1108	default:	1132	default:
…		…
1117	{	1141	{
1118	reset_connection ();	1142	reset_connection ();
1119	establish_connection ();	1143	establish_connection ();
1120	}	1144	}
1121	else if (NOW < last_activity + ::conf.keepalive)	1145	else if (NOW < last_activity + ::conf.keepalive)
1122	w.at = last_activity + ::conf.keepalive;	1146	w.start (last_activity + ::conf.keepalive);
1123	else if (conf->connectmode != conf_node::C_ONDEMAND	1147	else if (conf->connectmode != conf_node::C_ONDEMAND
1124	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1148	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1125	{	1149	{
1126	send_ping (si);	1150	send_ping (si);
1127	w.at = NOW + 5;	1151	w.start (NOW + 5);
1128	}	1152	}
1129	else if (NOW < last_activity + ::conf.keepalive + 10)	1153	else if (NOW < last_activity + ::conf.keepalive + 10)
1130	// hold ondemand connections implicitly a few seconds longer	1154	// hold ondemand connections implicitly a few seconds longer
1131	// should delete octx, though, or something like that ;)	1155	// should delete octx, though, or something like that ;)
1132	w.at = last_activity + ::conf.keepalive + 10;	1156	w.start (last_activity + ::conf.keepalive + 10);
1133	else	1157	else
1134	reset_connection ();	1158	reset_connection ();
1135	}	1159	}
1136		1160
1137	void connection::send_connect_request (int id)	1161	void connection::send_connect_request (int id)
…		…
1172	putenv ("STATE=down");	1196	putenv ("STATE=down");
1173		1197
1174	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1198	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1175	}	1199	}
1176		1200
1177	connection::connection(struct vpn *vpn_)	1201	connection::connection (struct vpn vpn, conf_node conf)
1178	: vpn(vpn_)	1202	: vpn(vpn), conf(conf)
1179	, rekey (this, &connection::rekey_cb)	1203	, rekey (this, &connection::rekey_cb)
1180	, keepalive (this, &connection::keepalive_cb)	1204	, keepalive (this, &connection::keepalive_cb)
1181	, establish_connection (this, &connection::establish_connection_cb)	1205	, establish_connection (this, &connection::establish_connection_cb)
		1206	#if ENABLE_DNS
		1207	, dns (0)
		1208	#endif
1182	{	1209	{
1183	octx = ictx = 0;	1210	octx = ictx = 0;
1184	retry_cnt = 0;	1211	retry_cnt = 0;
1185		1212
		1213	if (!conf->protocols) // make sure some protocol is enabled
		1214	conf->protocols = PROT_UDPv4;
		1215
1186	connectmode = conf_node::C_ALWAYS; // initial setting	1216	connectmode = conf_node::C_ALWAYS; // initial setting
1187	reset_connection ();	1217	reset_connection ();
1188	}	1218	}
1189		1219
1190	connection::~connection ()	1220	connection::~connection ()

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Comparing gvpe/src/connection.C (file contents): Revision 1.21 by pcg, Thu Oct 16 02:28:36 2003 UTC vs. Revision 1.50 by pcg, Fri Mar 18 01:53:05 2005 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.21 by pcg, Thu Oct 16 02:28:36 2003 UTC vs.
Revision 1.50 by pcg, Fri Mar 18 01:53:05 2005 UTC