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

Comparing gvpe/src/connection.C (file contents):
Revision 1.19 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.40 by pcg, Tue Mar 1 06:27:20 2005 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com>
3		4
4	This program is free software; you can redistribute it and/or modify	5	This program is free software; you can redistribute it and/or modify
5	it under the terms of the GNU General Public License as published by	6	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	7	the Free Software Foundation; either version 2 of the License, or
7	(at your option) any later version.	8	(at your option) any later version.
16	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA	17	Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17	*/	18	*/
18		19
19	#include "config.h"	20	#include "config.h"
20		21
21	extern "C" {	22	#include <cassert>
22	# include "lzf/lzf.h"
23	}
24		23
25	#include <list>	24	#include <list>
26		25
27	#include <openssl/rand.h>	26	#include <openssl/rand.h>
28	#include <openssl/evp.h>	27	#include <openssl/evp.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"
38	#include "connection.h"	37	#include "connection.h"
39		38
40	#include <sys/socket.h>	39	#include "netcompat.h"
41	#ifdef HAVE_NETINET_IN_H
42	# include <netinet/in.h>
43	#endif
44	#include <arpa/inet.h>
45	#include <net/if.h>
46	#ifdef HAVE_NETINET_IN_SYSTM_H
47	# include <netinet/in_systm.h>
48	#endif
49	#ifdef HAVE_NETINET_IP_H
50	# include <netinet/ip.h>
51	#endif
52
53	#ifndef IPTOS_TOS_MASK
54	# define IPTOS_TOS_MASK (IPTOS_LOWDELAY \| IPTOS_THROUGHPUT \| IPTOS_RELIABILITY \| IPTOS_MINCOST)
55	#endif
56		40
57	#if !HAVE_RAND_PSEUDO_BYTES	41	#if !HAVE_RAND_PSEUDO_BYTES
58	# define RAND_pseudo_bytes RAND_bytes	42	# define RAND_pseudo_bytes RAND_bytes
59	#endif	43	#endif
60		44
61	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	45	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
		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"
62		52
63	struct crypto_ctx	53	struct crypto_ctx
64	{	54	{
65	EVP_CIPHER_CTX cctx;	55	EVP_CIPHER_CTX cctx;
66	HMAC_CTX hctx;	56	HMAC_CTX hctx;
…		…
70	};	60	};
71		61
72	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)	62	crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc)
73	{	63	{
74	EVP_CIPHER_CTX_init (&cctx);	64	EVP_CIPHER_CTX_init (&cctx);
75	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));
76	HMAC_CTX_init (&hctx);	66	HMAC_CTX_init (&hctx);
77	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);
78	}	68	}
79		69
80	crypto_ctx::~crypto_ctx ()	70	crypto_ctx::~crypto_ctx ()
81	{	71	{
82	EVP_CIPHER_CTX_cleanup (&cctx);	72	require (EVP_CIPHER_CTX_cleanup (&cctx));
83	HMAC_CTX_cleanup (&hctx);	73	HMAC_CTX_cleanup (&hctx);
84	}	74	}
85		75
86	static void	76	static void
87	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)	77	rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h)
88	{	78	{
89	EVP_MD_CTX ctx;	79	EVP_MD_CTX ctx;
90		80
91	EVP_MD_CTX_init (&ctx);	81	EVP_MD_CTX_init (&ctx);
92	EVP_DigestInit (&ctx, RSA_HASH);	82	require (EVP_DigestInit (&ctx, RSA_HASH));
93	EVP_DigestUpdate(&ctx, &chg, sizeof chg);	83	require (EVP_DigestUpdate(&ctx, &chg, sizeof chg));
94	EVP_DigestUpdate(&ctx, &id, sizeof id);	84	require (EVP_DigestUpdate(&ctx, &id, sizeof id));
95	EVP_DigestFinal (&ctx, (unsigned char *)&h, 0);	85	require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0));
96	EVP_MD_CTX_cleanup (&ctx);	86	EVP_MD_CTX_cleanup (&ctx);
97	}	87	}
98		88
99	struct rsa_entry {	89	struct rsa_entry {
100	tstamp expire;	90	tstamp expire;
…		…
148		138
149	} rsa_cache;	139	} rsa_cache;
150		140
151	void rsa_cache::cleaner_cb (time_watcher &w)	141	void rsa_cache::cleaner_cb (time_watcher &w)
152	{	142	{
153	if (empty ())	143	if (!empty ())
154	w.at = TSTAMP_CANCEL;
155	else
156	{	144	{
157	w.at = NOW + RSA_TTL;	145	w.start (NOW + RSA_TTL);
158		146
159	for (iterator i = begin (); i != end (); )	147	for (iterator i = begin (); i != end (); )
160	if (i->expire <= NOW)	148	if (i->expire <= NOW)
161	i = erase (i);	149	i = erase (i);
162	else	150	else
…		…
214	// 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.
215	// this implementation ("splay list" ;) is inefficient,	203	// this implementation ("splay list" ;) is inefficient,
216	// but low on resources.	204	// but low on resources.
217	struct net_rate_limiter : list<net_rateinfo>	205	struct net_rate_limiter : list<net_rateinfo>
218	{	206	{
219	static const double ALPHA = 1. - 1. / 600.; // allow bursts	207	# define NRL_ALPHA (1. - 1. / 600.) // allow bursts
220	static const double CUTOFF = 10.; // one event every CUTOFF seconds	208	# define NRL_CUTOFF 10. // one event every CUTOFF seconds
221	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	209	# define NRL_EXPIRE (NRL_CUTOFF * 30.) // expire entries after this time
222	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
223		211
224	bool can (const sockinfo &si) { return can((u32)si.host); }	212	bool can (const sockinfo &si) { return can((u32)si.host); }
225	bool can (u32 host);	213	bool can (u32 host);
226	};	214	};
227		215
…		…
232	iterator i;	220	iterator i;
233		221
234	for (i = begin (); i != end (); )	222	for (i = begin (); i != end (); )
235	if (i->host == host)	223	if (i->host == host)
236	break;	224	break;
237	else if (i->last < NOW - EXPIRE)	225	else if (i->last < NOW - NRL_EXPIRE)
238	i = erase (i);	226	i = erase (i);
239	else	227	else
240	i++;	228	i++;
241		229
242	if (i == end ())	230	if (i == end ())
243	{	231	{
244	net_rateinfo ri;	232	net_rateinfo ri;
245		233
246	ri.host = host;	234	ri.host = host;
247	ri.pcnt = 1.;	235	ri.pcnt = 1.;
248	ri.diff = MAXDIF;	236	ri.diff = NRL_MAXDIF;
249	ri.last = NOW;	237	ri.last = NOW;
250		238
251	push_front (ri);	239	push_front (ri);
252		240
253	return true;	241	return true;
…		…
255	else	243	else
256	{	244	{
257	net_rateinfo ri (*i);	245	net_rateinfo ri (*i);
258	erase (i);	246	erase (i);
259		247
260	ri.pcnt = ri.pcnt * ALPHA;	248	ri.pcnt = ri.pcnt * NRL_ALPHA;
261	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	249	ri.diff = ri.diff * NRL_ALPHA + (NOW - ri.last);
262		250
263	ri.last = NOW;	251	ri.last = NOW;
264		252
265	double dif = ri.diff / ri.pcnt;	253	double dif = ri.diff / ri.pcnt;
266		254
267	bool send = dif > CUTOFF;	255	bool send = dif > NRL_CUTOFF;
268		256
269	if (dif > MAXDIF)	257	if (dif > NRL_MAXDIF)
270	{	258	{
271	ri.pcnt = 1.;	259	ri.pcnt = 1.;
272	ri.diff = MAXDIF;	260	ri.diff = NRL_MAXDIF;
273	}	261	}
274	else if (send)	262	else if (send)
275	ri.pcnt++;	263	ri.pcnt++;
276		264
277	push_front (ri);	265	push_front (ri);
…		…
324	}	312	}
325		313
326	#define MAXVPNDATA (MAX_MTU - 6 - 6)	314	#define MAXVPNDATA (MAX_MTU - 6 - 6)
327	#define DATAHDR (sizeof (u32) + RAND_SIZE)	315	#define DATAHDR (sizeof (u32) + RAND_SIZE)
328		316
329	struct vpndata_packet:vpn_packet	317	struct vpndata_packet : vpn_packet
330	{	318	{
331	u8 data[MAXVPNDATA + DATAHDR]; // seqno	319	u8 data[MAXVPNDATA + DATAHDR]; // seqno
332		320
333	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);
334	tap_packet unpack (connection conn, u32 &seqno);	322	tap_packet unpack (connection conn, u32 &seqno);
…		…
347	int outl = 0, outl2;	335	int outl = 0, outl2;
348	ptype type = PT_DATA_UNCOMPRESSED;	336	ptype type = PT_DATA_UNCOMPRESSED;
349		337
350	#if ENABLE_COMPRESSION	338	#if ENABLE_COMPRESSION
351	u8 cdata[MAX_MTU];	339	u8 cdata[MAX_MTU];
352	u32 cl;
353		340
		341	if (conn->features & ENABLE_COMPRESSION)
		342	{
354	cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);	343	u32 cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7);
		344
355	if (cl)	345	if (cl)
356	{	346	{
357	type = PT_DATA_COMPRESSED;	347	type = PT_DATA_COMPRESSED;
358	d = cdata;	348	d = cdata;
359	l = cl + 2;	349	l = cl + 2;
360		350
361	d[0] = cl >> 8;	351	d[0] = cl >> 8;
362	d[1] = cl;	352	d[1] = cl;
		353	}
363	}	354	}
364	#endif	355	#endif
365		356
366	EVP_EncryptInit_ex (cctx, 0, 0, 0, 0);	357	require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0));
367		358
368	struct {	359	struct {
369	#if RAND_SIZE	360	#if RAND_SIZE
370	u8 rnd[RAND_SIZE];	361	u8 rnd[RAND_SIZE];
371	#endif	362	#endif
…		…
375	datahdr.seqno = ntohl (seqno);	366	datahdr.seqno = ntohl (seqno);
376	#if RAND_SIZE	367	#if RAND_SIZE
377	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);	368	RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE);
378	#endif	369	#endif
379		370
380	EVP_EncryptUpdate (cctx,	371	require (EVP_EncryptUpdate (cctx,
381	(unsigned char *) data + outl, &outl2,	372	(unsigned char *) data + outl, &outl2,
382	(unsigned char *) &datahdr, DATAHDR);	373	(unsigned char *) &datahdr, DATAHDR));
383	outl += outl2;	374	outl += outl2;
384		375
385	EVP_EncryptUpdate (cctx,	376	require (EVP_EncryptUpdate (cctx,
386	(unsigned char *) data + outl, &outl2,	377	(unsigned char *) data + outl, &outl2,
387	(unsigned char *) d, l);	378	(unsigned char *) d, l));
388	outl += outl2;	379	outl += outl2;
389		380
390	EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2);	381	require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2));
391	outl += outl2;	382	outl += outl2;
392		383
393	len = outl + data_hdr_size ();	384	len = outl + data_hdr_size ();
394		385
395	set_hdr (type, dst);	386	set_hdr (type, dst);
…		…
404	int outl = 0, outl2;	395	int outl = 0, outl2;
405	tap_packet *p = new tap_packet;	396	tap_packet *p = new tap_packet;
406	u8 *d;	397	u8 *d;
407	u32 l = len - data_hdr_size ();	398	u32 l = len - data_hdr_size ();
408		399
409	EVP_DecryptInit_ex (cctx, 0, 0, 0, 0);	400	require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0));
410		401
411	#if ENABLE_COMPRESSION	402	#if ENABLE_COMPRESSION
412	u8 cdata[MAX_MTU];	403	u8 cdata[MAX_MTU];
413		404
414	if (type == PT_DATA_COMPRESSED)	405	if (type == PT_DATA_COMPRESSED)
…		…
416	else	407	else
417	#endif	408	#endif
418	d = &(*p)[6 + 6 - DATAHDR];	409	d = &(*p)[6 + 6 - DATAHDR];
419		410
420	/* 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 */
421	EVP_DecryptUpdate (cctx,	412	require (EVP_DecryptUpdate (cctx,
422	d, &outl2,	413	d, &outl2,
423	(unsigned char *)&data, len - data_hdr_size ());	414	(unsigned char *)&data, len - data_hdr_size ()));
424	outl += outl2;	415	outl += outl2;
425		416
426	EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2);	417	require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2));
427	outl += outl2;	418	outl += outl2;
428		419
429	seqno = ntohl ((u32 )(d + RAND_SIZE));	420	seqno = ntohl ((u32 )(d + RAND_SIZE));
430		421
431	id2mac (dst () ? dst() : THISNODE->id, p->dst);	422	id2mac (dst () ? dst() : THISNODE->id, p->dst);
…		…
460	{	451	{
461	// actually, hmaclen cannot be checked because the hmac	452	// actually, hmaclen cannot be checked because the hmac
462	// field comes before this data, so peers with other	453	// field comes before this data, so peers with other
463	// hmacs simply will not work.	454	// hmacs simply will not work.
464	u8 prot_major, prot_minor, randsize, hmaclen;	455	u8 prot_major, prot_minor, randsize, hmaclen;
465	u8 flags, challengelen, pad2, pad3;	456	u8 flags, challengelen, features, pad3;
466	u32 cipher_nid, digest_nid, hmac_nid;	457	u32 cipher_nid, digest_nid, hmac_nid;
467
468	const u8 curflags () const
469	{
470	return 0x80
471	\| (ENABLE_COMPRESSION ? 0x01 : 0x00);
472	}
473		458
474	void setup (ptype type, int dst);	459	void setup (ptype type, int dst);
475	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	}
476	};	473	};
477		474
478	void config_packet::setup (ptype type, int dst)	475	void config_packet::setup (ptype type, int dst)
479	{	476	{
480	prot_major = PROTOCOL_MAJOR;	477	prot_major = PROTOCOL_MAJOR;
481	prot_minor = PROTOCOL_MINOR;	478	prot_minor = PROTOCOL_MINOR;
482	randsize = RAND_SIZE;	479	randsize = RAND_SIZE;
483	hmaclen = HMACLENGTH;	480	hmaclen = HMACLENGTH;
484	flags = curflags ();	481	flags = ENABLE_COMPRESSION ? 0x81 : 0x80;
485	challengelen = sizeof (rsachallenge);	482	challengelen = sizeof (rsachallenge);
		483	features = get_features ();
486		484
487	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));	485	cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
488	digest_nid = htonl (EVP_MD_type (RSA_HASH));	486	digest_nid = htonl (EVP_MD_type (RSA_HASH));
489	hmac_nid = htonl (EVP_MD_type (DIGEST));	487	hmac_nid = htonl (EVP_MD_type (DIGEST));
490		488
…		…
493	}	491	}
494		492
495	bool config_packet::chk_config () const	493	bool config_packet::chk_config () const
496	{	494	{
497	if (prot_major != PROTOCOL_MAJOR)	495	if (prot_major != PROTOCOL_MAJOR)
498	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);
499	else if (randsize != RAND_SIZE)	497	else if (randsize != RAND_SIZE)
500	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);
501	else if (hmaclen != HMACLENGTH)	499	else if (hmaclen != HMACLENGTH)
502	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);	500	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
		501	#if 0 // this implementation should handle all flag settings
503	else if (flags != curflags ())	502	else if (flags != curflags ())
504	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());	503	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
		504	#endif
505	else if (challengelen != sizeof (rsachallenge))	505	else if (challengelen != sizeof (rsachallenge))
506	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));	506	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))	507	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
508	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));	508	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))	509	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
510	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));	510	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))	511	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
512	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));	512	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
513	else	513	else
514	return true;	514	return true;
515		515
516	return false;	516	return false;
517	}	517	}
518		518
519	struct auth_req_packet : config_packet	519	struct auth_req_packet : config_packet
520	{	520	{
521	char magic[8];	521	char magic[8];
522	u8 initiate; // false if this is just an automatic reply	522	u8 initiate; // false if this is just an automatic reply
523	u8 protocols; // supported protocols (will get patches on forward)	523	u8 protocols; // supported protocols (will be patched on forward)
524	u8 pad2, pad3;	524	u8 pad2, pad3;
525	rsaid id;	525	rsaid id;
526	rsaencrdata encr;	526	rsaencrdata encr;
527		527
528	auth_req_packet (int dst, bool initiate_, u8 protocols_)	528	auth_req_packet (int dst, bool initiate_, u8 protocols_)
…		…
589	{	589	{
590	if (ictx && octx)	590	if (ictx && octx)
591	{	591	{
592	connectmode = conf->connectmode;	592	connectmode = conf->connectmode;
593		593
		594	// make sure rekeying timeouts are slightly asymmetric
594	rekey.start (NOW + ::conf.rekey);	595	rekey.start (NOW + ::conf.rekey
		596	+ (conf->id > THISNODE->id ? 10 : 0));
595	keepalive.start (NOW + ::conf.keepalive);	597	keepalive.start (NOW + ::conf.keepalive);
596		598
597	// send queued packets	599	// send queued packets
598	if (ictx && octx)	600	if (ictx && octx)
599	{	601	{
…		…
612	}	614	}
613	else	615	else
614	{	616	{
615	retry_cnt = 0;	617	retry_cnt = 0;
616	establish_connection.start (NOW + 5);	618	establish_connection.start (NOW + 5);
617	keepalive.reset ();	619	keepalive.stop ();
618	rekey.reset ();	620	rekey.stop ();
619	}	621	}
620	}	622	}
621		623
622	void	624	void
623	connection::reset_si ()	625	connection::reset_si ()
…		…
625	protocol = best_protocol (THISNODE->protocols & conf->protocols);	627	protocol = best_protocol (THISNODE->protocols & conf->protocols);
626		628
627	// mask out protocols we cannot establish	629	// mask out protocols we cannot establish
628	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	630	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
629	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	631	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		632	if (!conf->dns_port) protocol &= ~PROT_DNSv4;
630		633
631	si.set (conf, protocol);	634	si.set (conf, protocol);
632	}	635	}
633		636
634	// ensure sockinfo is valid, forward if necessary	637	// ensure sockinfo is valid, forward if necessary
…		…
654	}	657	}
655		658
656	void	659	void
657	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)	660	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
658	{	661	{
659	if (!vpn->send_vpn_packet (pkt, si, tos))	662	bool ok;
		663
		664	switch (si.prot)
		665	{
		666	case PROT_IPv4:
		667	ok = vpn->send_ipv4_packet (pkt, si, tos); break;
		668	case PROT_UDPv4:
		669	ok = vpn->send_udpv4_packet (pkt, si, tos); break;
		670	#if ENABLE_TCP
		671	case PROT_TCPv4:
		672	ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
		673	#endif
		674	#if ENABLE_ICMP
		675	case PROT_ICMPv4:
		676	ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
		677	#endif
		678	#if ENABLE_DNS
		679	case PROT_DNSv4:
		680	ok = send_dnsv4_packet (pkt, si, tos); break;
		681	#endif
		682
		683	default:
		684	slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
		685	ok = false;
		686	}
		687
		688	if (!ok)
660	reset_connection ();	689	reset_connection ();
661	}	690	}
662		691
663	void	692	void
664	connection::send_ping (const sockinfo &si, u8 pong)	693	connection::send_ping (const sockinfo &si, u8 pong)
…		…
689	connection::send_auth_request (const sockinfo &si, bool initiate)	718	connection::send_auth_request (const sockinfo &si, bool initiate)
690	{	719	{
691	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	720	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
692		721
693	rsachallenge chg;	722	rsachallenge chg;
694
695	rsa_cache.gen (pkt->id, chg);	723	rsa_cache.gen (pkt->id, chg);
696		724	rsa_encrypt (conf->rsa_key, chg, pkt->encr);
697	if (0 > RSA_public_encrypt (sizeof chg,
698	(unsigned char )&chg, (unsigned char )&pkt->encr,
699	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
700	fatal ("RSA_public_encrypt error");
701		725
702	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	726	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
703		727
704	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly	728	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
705		729
…		…
739	}	763	}
740		764
741	void	765	void
742	connection::establish_connection_cb (time_watcher &w)	766	connection::establish_connection_cb (time_watcher &w)
743	{	767	{
744	if (ictx \|\| conf == THISNODE	768	if (!ictx
		769	&& conf != THISNODE
745	\|\| connectmode == conf_node::C_NEVER	770	&& connectmode != conf_node::C_NEVER
746	\|\| connectmode == conf_node::C_DISABLED)	771	&& connectmode != conf_node::C_DISABLED
747	w.at = TSTAMP_CANCEL;	772	&& NOW > w.at)
748	else if (w.at <= NOW)
749	{	773	{
750	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	774	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
751		775
752	if (retry_int < 3600 * 8)	776	if (retry_int < conf->max_retry)
753	retry_cnt++;	777	retry_cnt++;
		778	else
		779	retry_int = conf->max_retry;
754		780
755	w.at = NOW + retry_int;	781	w.start (NOW + retry_int);
756		782
757	reset_si ();	783	reset_si ();
758		784
759	if (si.prot && !si.host)	785	if (si.prot && !si.host)
760	vpn->send_connect_request (conf->id);	786	vpn->send_connect_request (conf->id);
…		…
786	}	812	}
787		813
788	delete ictx; ictx = 0;	814	delete ictx; ictx = 0;
789	delete octx; octx = 0;	815	delete octx; octx = 0;
790		816
791	si.host= 0;	817	si.host = 0;
792		818
793	last_activity = 0;	819	last_activity = 0;
794	retry_cnt = 0;	820	retry_cnt = 0;
795		821
796	rekey.reset ();	822	rekey.stop ();
797	keepalive.reset ();	823	keepalive.stop ();
798	establish_connection.reset ();	824	establish_connection.stop ();
799	}	825	}
800		826
801	void	827	void
802	connection::shutdown ()	828	connection::shutdown ()
803	{	829	{
…		…
808	}	834	}
809		835
810	void	836	void
811	connection::rekey_cb (time_watcher &w)	837	connection::rekey_cb (time_watcher &w)
812	{	838	{
813	w.at = TSTAMP_CANCEL;
814
815	reset_connection ();	839	reset_connection ();
816	establish_connection ();	840	establish_connection ();
817	}	841	}
818		842
819	void	843	void
820	connection::send_data_packet (tap_packet *pkt, bool broadcast)	844	connection::send_data_packet (tap_packet *pkt)
821	{	845	{
822	vpndata_packet *p = new vpndata_packet;	846	vpndata_packet *p = new vpndata_packet;
823	int tos = 0;	847	int tos = 0;
824		848
825	// I am not hilarious about peeking into packets, but so be it.	849	// I am not hilarious about peeking into packets, but so be it.
826	if (conf->inherit_tos	850	if (conf->inherit_tos && pkt->is_ipv4 ())
827	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
828	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
829	tos = (*pkt)[15] & IPTOS_TOS_MASK;	851	tos = (*pkt)[15] & IPTOS_TOS_MASK;
830		852
831	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	853	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
832	send_vpn_packet (p, si, tos);	854	send_vpn_packet (p, si, tos);
833		855
834	delete p;	856	delete p;
835		857
836	if (oseqno > MAX_SEQNO)	858	if (oseqno > MAX_SEQNO)
837	rekey ();	859	rekey ();
838	}	860	}
839		861
840	void	862	void
841	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	863	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
842	{	864	{
843	if (ictx && octx)	865	if (ictx && octx)
844	send_data_packet (pkt, broadcast);	866	send_data_packet (pkt);
845	else	867	else
846	{	868	{
847	if (!broadcast)//DDDD	869	if (!broadcast)//DDDD
848	data_queue.put (new tap_packet (*pkt));	870	data_queue.put (new tap_packet (*pkt));
849		871
…		…
855	{	877	{
856	if (ictx && octx)	878	if (ictx && octx)
857	send_vpn_packet (pkt, si, tos);	879	send_vpn_packet (pkt, si, tos);
858	else	880	else
859	{	881	{
860	vpn_queue.put (new vpn_packet (*pkt));	882	vpn_queue.put ((vpn_packet )new data_packet ((data_packet *)pkt));
861		883
862	establish_connection ();	884	establish_connection ();
863	}	885	}
864	}	886	}
865		887
…		…
924	if (p->initiate)	946	if (p->initiate)
925	send_auth_request (rsi, false);	947	send_auth_request (rsi, false);
926		948
927	rsachallenge k;	949	rsachallenge k;
928		950
929	if (0 > RSA_private_decrypt (sizeof (p->encr),	951	if (!rsa_decrypt (::conf.rsa_key, p->encr, k))
930	(unsigned char )&p->encr, (unsigned char )&k,	952	{
931	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
932	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),	953	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
933	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));	954	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		955	break;
		956	}
934	else	957	else
935	{	958	{
936	delete octx;	959	delete octx;
937		960
938	octx = new crypto_ctx (k, 1);	961	octx = new crypto_ctx (k, 1);
939	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;	962	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
940		963
		964	// compatibility code, remove when no longer required
		965	if (p->flags & 1) p->features \|= FEATURE_COMPRESSION;
		966
941	conf->protocols = p->protocols;	967	conf->protocols = p->protocols;
		968	features = p->features & config_packet::get_features ();
942		969
943	send_auth_response (rsi, p->id, k);	970	send_auth_response (rsi, p->id, k);
944		971
945	connection_established ();	972	connection_established ();
946		973
…		…
982	crypto_ctx *cctx = new crypto_ctx (chg, 0);	1009	crypto_ctx *cctx = new crypto_ctx (chg, 0);
983		1010
984	if (!p->hmac_chk (cctx))	1011	if (!p->hmac_chk (cctx))
985	{	1012	{
986	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"	1013	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
987	"could be an attack, or just corruption or an synchronization error"),	1014	"could be an attack, or just corruption or a synchronization error"),
988	conf->nodename, (const char *)rsi);	1015	conf->nodename, (const char *)rsi);
989	break;	1016	break;
990	}	1017	}
991	else	1018	else
992	{	1019	{
…		…
1041	{	1068	{
1042	vpndata_packet p = (vpndata_packet )pkt;	1069	vpndata_packet p = (vpndata_packet )pkt;
1043		1070
1044	if (!p->hmac_chk (ictx))	1071	if (!p->hmac_chk (ictx))
1045	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"	1072	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
1046	"could be an attack, or just corruption or an synchronization error"),	1073	"could be an attack, or just corruption or a synchronization error"),
1047	conf->nodename, (const char *)rsi);	1074	conf->nodename, (const char *)rsi);
1048	else	1075	else
1049	{	1076	{
1050	u32 seqno;	1077	u32 seqno;
1051	tap_packet *d = p->unpack (this, seqno);	1078	tap_packet *d = p->unpack (this, seqno);
1052		1079
1053	if (iseqno.recv_ok (seqno))	1080	if (iseqno.recv_ok (seqno))
1054	{	1081	{
1055	vpn->tap->send (d);	1082	vpn->tap->send (d);
1056		1083
1057	if (p->dst () == 0) // re-broadcast
1058	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1059	{
1060	connection c = i;
1061
1062	if (c->conf != THISNODE && c->conf != conf)
1063	c->inject_data_packet (d);
1064	}
1065
1066	if (si != rsi)	1084	if (si != rsi)
1067	{	1085	{
1068	// fast re-sync on connection changes, useful especially for tcp/ip	1086	// fast re-sync on connection changes, useful especially for tcp/ip
1069	si = rsi;	1087	si = rsi;
1070		1088
1071	slog (L_INFO, _("%s(%s): socket address changed to %s"),	1089	slog (L_INFO, _("%s(%s): socket address changed to %s"),
1072	conf->nodename, (const char )si, (const char )rsi);	1090	conf->nodename, (const char )si, (const char )rsi);
1073	}	1091	}
1074
1075	delete d;
1076
1077	break;
1078	}	1092	}
		1093
		1094	delete d;
		1095	break;
1079	}	1096	}
1080	}	1097	}
1081		1098
1082	send_reset (rsi);	1099	send_reset (rsi);
1083	break;	1100	break;
…		…
1108	break;	1125	break;
1109		1126
1110	case vpn_packet::PT_CONNECT_INFO:	1127	case vpn_packet::PT_CONNECT_INFO:
1111	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1128	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1112	{	1129	{
1113	connect_info_packet p = (connect_info_packet ) pkt;	1130	connect_info_packet p = (connect_info_packet )pkt;
1114		1131
1115	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1132	if (p->id > 0 && p->id <= vpn->conns.size ()) // hmac-auth does not mean we accept anything
1116		1133	{
1117	connection *c = vpn->conns[p->id - 1];	1134	connection *c = vpn->conns[p->id - 1];
1118		1135
1119	c->conf->protocols = p->protocols;	1136	c->conf->protocols = p->protocols;
1120	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));	1137	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
1121	p->si.upgrade_protocol (protocol, c->conf);	1138	p->si.upgrade_protocol (protocol, c->conf);
1122		1139
1123	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1140	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1124	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1141	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1125		1142
1126	const sockinfo &dsi = forward_si (p->si);	1143	const sockinfo &dsi = forward_si (p->si);
1127		1144
1128	if (dsi.valid ())	1145	if (dsi.valid ())
1129	c->send_auth_request (dsi, true);	1146	c->send_auth_request (dsi, true);
		1147	}
1130	}	1148	}
1131		1149
1132	break;	1150	break;
1133		1151
1134	default:	1152	default:
…		…
1143	{	1161	{
1144	reset_connection ();	1162	reset_connection ();
1145	establish_connection ();	1163	establish_connection ();
1146	}	1164	}
1147	else if (NOW < last_activity + ::conf.keepalive)	1165	else if (NOW < last_activity + ::conf.keepalive)
1148	w.at = last_activity + ::conf.keepalive;	1166	w.start (last_activity + ::conf.keepalive);
1149	else if (conf->connectmode != conf_node::C_ONDEMAND	1167	else if (conf->connectmode != conf_node::C_ONDEMAND
1150	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1168	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1151	{	1169	{
1152	send_ping (si);	1170	send_ping (si);
1153	w.at = NOW + 5;	1171	w.start (NOW + 5);
1154	}	1172	}
1155	else if (NOW < last_activity + ::conf.keepalive + 10)	1173	else if (NOW < last_activity + ::conf.keepalive + 10)
1156	// hold ondemand connections implicitly a few seconds longer	1174	// hold ondemand connections implicitly a few seconds longer
1157	// should delete octx, though, or something like that ;)	1175	// should delete octx, though, or something like that ;)
1158	w.at = last_activity + ::conf.keepalive + 10;	1176	w.start (last_activity + ::conf.keepalive + 10);
1159	else	1177	else
1160	reset_connection ();	1178	reset_connection ();
1161	}	1179	}
1162		1180
1163	void connection::send_connect_request (int id)	1181	void connection::send_connect_request (int id)
…		…
1198	putenv ("STATE=down");	1216	putenv ("STATE=down");
1199		1217
1200	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1218	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1201	}	1219	}
1202		1220
1203	connection::connection(struct vpn *vpn_)	1221	connection::connection (struct vpn vpn, conf_node conf)
1204	: vpn(vpn_)	1222	: vpn(vpn), conf(conf)
1205	, rekey (this, &connection::rekey_cb)	1223	, rekey (this, &connection::rekey_cb)
1206	, keepalive (this, &connection::keepalive_cb)	1224	, keepalive (this, &connection::keepalive_cb)
1207	, establish_connection (this, &connection::establish_connection_cb)	1225	, establish_connection (this, &connection::establish_connection_cb)
		1226	#if ENABLE_DNS
		1227	, dnsv4_tw (this, &connection::dnsv4_cb)
		1228	#endif
1208	{	1229	{
1209	octx = ictx = 0;	1230	octx = ictx = 0;
1210	retry_cnt = 0;	1231	retry_cnt = 0;
1211		1232
		1233	if (!conf->protocols) // make sure some protocol is enabled
		1234	conf->protocols = PROT_UDPv4;
		1235
1212	connectmode = conf_node::C_ALWAYS; // initial setting	1236	connectmode = conf_node::C_ALWAYS; // initial setting
1213	reset_connection ();	1237	reset_connection ();
1214	}	1238	}
1215		1239
1216	connection::~connection ()	1240	connection::~connection ()

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Comparing gvpe/src/connection.C (file contents): Revision 1.19 by pcg, Tue Oct 14 03:22:09 2003 UTC vs. Revision 1.40 by pcg, Tue Mar 1 06:27:20 2005 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.19 by pcg, Tue Oct 14 03:22:09 2003 UTC vs.
Revision 1.40 by pcg, Tue Mar 1 06:27:20 2005 UTC