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

Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.23 by pcg, Wed Oct 22 00:42:53 2003 UTC

…		…
1	/*	1	/*
2	connection.C -- manage a single connection	2	connection.C -- manage a single connection
		3	Copyright (C) 2003 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.
22	# include "lzf/lzf.h"	23	# include "lzf/lzf.h"
23	}	24	}
24		25
25	#include <list>	26	#include <list>
26		27
		28	#include <openssl/rand.h>
		29	#include <openssl/evp.h>
		30	#include <openssl/rsa.h>
		31	#include <openssl/err.h>
		32
27	#include "gettext.h"	33	#include "gettext.h"
28		34
29	#include "conf.h"	35	#include "conf.h"
30	#include "slog.h"	36	#include "slog.h"
31	#include "device.h"	37	#include "device.h"
32	#include "protocol.h"	38	#include "vpn.h"
33	#include "connection.h"	39	#include "connection.h"
		40
		41	#include "netcompat.h"
34		42
35	#if !HAVE_RAND_PSEUDO_BYTES	43	#if !HAVE_RAND_PSEUDO_BYTES
36	# define RAND_pseudo_bytes RAND_bytes	44	# define RAND_pseudo_bytes RAND_bytes
37	#endif	45	#endif
38		46
…		…
80	rsachallenge chg;	88	rsachallenge chg;
81	};	89	};
82		90
83	struct rsa_cache : list<rsa_entry>	91	struct rsa_cache : list<rsa_entry>
84	{	92	{
85	void cleaner_cb (tstamp &ts); time_watcher cleaner;	93	void cleaner_cb (time_watcher &w); time_watcher cleaner;
86		94
87	bool find (const rsaid &id, rsachallenge &chg)	95	bool find (const rsaid &id, rsachallenge &chg)
88	{	96	{
89	for (iterator i = begin (); i != end (); ++i)	97	for (iterator i = begin (); i != end (); ++i)
90	{	98	{
…		…
124	: cleaner (this, &rsa_cache::cleaner_cb)	132	: cleaner (this, &rsa_cache::cleaner_cb)
125	{ }	133	{ }
126		134
127	} rsa_cache;	135	} rsa_cache;
128		136
129	void rsa_cache::cleaner_cb (tstamp &ts)	137	void rsa_cache::cleaner_cb (time_watcher &w)
130	{	138	{
131	if (empty ())	139	if (empty ())
132	ts = TSTAMP_CANCEL;	140	w.at = TSTAMP_CANCEL;
133	else	141	else
134	{	142	{
135	ts = NOW + RSA_TTL;	143	w.at = NOW + RSA_TTL;
136		144
137	for (iterator i = begin (); i != end (); )	145	for (iterator i = begin (); i != end (); )
138	if (i->expire <= NOW)	146	if (i->expire <= NOW)
139	i = erase (i);	147	i = erase (i);
140	else	148	else
…		…
142	}	150	}
143	}	151	}
144		152
145	//////////////////////////////////////////////////////////////////////////////	153	//////////////////////////////////////////////////////////////////////////////
146		154
147	void pkt_queue::put (tap_packet *p)	155	void pkt_queue::put (net_packet *p)
148	{	156	{
149	if (queue[i])	157	if (queue[i])
150	{	158	{
151	delete queue[i];	159	delete queue[i];
152	j = (j + 1) % QUEUEDEPTH;	160	j = (j + 1) % QUEUEDEPTH;
…		…
155	queue[i] = p;	163	queue[i] = p;
156		164
157	i = (i + 1) % QUEUEDEPTH;	165	i = (i + 1) % QUEUEDEPTH;
158	}	166	}
159		167
160	tap_packet *pkt_queue::get ()	168	net_packet *pkt_queue::get ()
161	{	169	{
162	tap_packet *p = queue[j];	170	net_packet *p = queue[j];
163		171
164	if (p)	172	if (p)
165	{	173	{
166	queue[j] = 0;	174	queue[j] = 0;
167	j = (j + 1) % QUEUEDEPTH;	175	j = (j + 1) % QUEUEDEPTH;
…		…
192	// only do action once every x seconds per host whole allowing bursts.	200	// only do action once every x seconds per host whole allowing bursts.
193	// this implementation ("splay list" ;) is inefficient,	201	// this implementation ("splay list" ;) is inefficient,
194	// but low on resources.	202	// but low on resources.
195	struct net_rate_limiter : list<net_rateinfo>	203	struct net_rate_limiter : list<net_rateinfo>
196	{	204	{
197	static const double ALPHA = 1. - 1. / 90.; // allow bursts	205	static const double ALPHA = 1. - 1. / 600.; // allow bursts
198	static const double CUTOFF = 20.; // one event every CUTOFF seconds	206	static const double CUTOFF = 10.; // one event every CUTOFF seconds
199	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	207	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
		208	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value
200		209
201	bool can (const sockinfo &si) { return can((u32)si.host); }	210	bool can (const sockinfo &si) { return can((u32)si.host); }
202	bool can (u32 host);	211	bool can (u32 host);
203	};	212	};
204		213
205	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	214	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
206		215
…		…
220	{	229	{
221	net_rateinfo ri;	230	net_rateinfo ri;
222		231
223	ri.host = host;	232	ri.host = host;
224	ri.pcnt = 1.;	233	ri.pcnt = 1.;
225	ri.diff = CUTOFF * (1. / (1. - ALPHA));	234	ri.diff = MAXDIF;
226	ri.last = NOW;	235	ri.last = NOW;
227		236
228	push_front (ri);	237	push_front (ri);
229		238
230	return true;	239	return true;
…		…
237	ri.pcnt = ri.pcnt * ALPHA;	246	ri.pcnt = ri.pcnt * ALPHA;
238	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	247	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
239		248
240	ri.last = NOW;	249	ri.last = NOW;
241		250
		251	double dif = ri.diff / ri.pcnt;
		252
242	bool send = ri.diff / ri.pcnt > CUTOFF;	253	bool send = dif > CUTOFF;
243		254
		255	if (dif > MAXDIF)
		256	{
		257	ri.pcnt = 1.;
		258	ri.diff = MAXDIF;
		259	}
244	if (send)	260	else if (send)
245	ri.pcnt++;	261	ri.pcnt++;
246		262
247	push_front (ri);	263	push_front (ri);
248		264
249	return send;	265	return send;
…		…
280	hmac_gen (ctx);	296	hmac_gen (ctx);
281		297
282	return !memcmp (hmac, hmac_digest, HMACLENGTH);	298	return !memcmp (hmac, hmac_digest, HMACLENGTH);
283	}	299	}
284		300
285	void vpn_packet::set_hdr (ptype type, unsigned int dst)	301	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
286	{	302	{
287	this->type = type;	303	type = type_;
288		304
289	int src = THISNODE->id;	305	int src = THISNODE->id;
290		306
291	src1 = src;	307	src1 = src;
292	srcdst = ((src >> 8) << 4) \| (dst >> 8);	308	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
462	set_hdr (type, dst);	478	set_hdr (type, dst);
463	}	479	}
464		480
465	bool config_packet::chk_config () const	481	bool config_packet::chk_config () const
466	{	482	{
467	return prot_major == PROTOCOL_MAJOR	483	if (prot_major != PROTOCOL_MAJOR)
468	&& randsize == RAND_SIZE	484	slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
469	&& hmaclen == HMACLENGTH	485	else if (randsize != RAND_SIZE)
470	&& flags == curflags ()	486	slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
		487	else if (hmaclen != HMACLENGTH)
		488	slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
		489	else if (flags != curflags ())
		490	slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
471	&& challengelen == sizeof (rsachallenge)	491	else if (challengelen != sizeof (rsachallenge))
		492	slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
472	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	493	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		494	slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
473	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	495	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		496	slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
474	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	497	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		498	slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		499	else
		500	return true;
		501
		502	return false;
475	}	503	}
476		504
477	struct auth_req_packet : config_packet	505	struct auth_req_packet : config_packet
478	{	506	{
479	char magic[8];	507	char magic[8];
…		…
541	};	569	};
542		570
543	/////////////////////////////////////////////////////////////////////////////	571	/////////////////////////////////////////////////////////////////////////////
544		572
545	void	573	void
		574	connection::connection_established ()
		575	{
		576	if (ictx && octx)
		577	{
		578	connectmode = conf->connectmode;
		579
		580	rekey.start (NOW + ::conf.rekey);
		581	keepalive.start (NOW + ::conf.keepalive);
		582
		583	// send queued packets
		584	if (ictx && octx)
		585	{
		586	while (tap_packet p = (tap_packet )data_queue.get ())
		587	{
		588	send_data_packet (p);
		589	delete p;
		590	}
		591
		592	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		593	{
		594	send_vpn_packet (p, si, IPTOS_RELIABILITY);
		595	delete p;
		596	}
		597	}
		598	}
		599	else
		600	{
		601	retry_cnt = 0;
		602	establish_connection.start (NOW + 5);
		603	keepalive.reset ();
		604	rekey.reset ();
		605	}
		606	}
		607
		608	void
546	connection::reset_dstaddr ()	609	connection::reset_si ()
547	{	610	{
		611	protocol = best_protocol (THISNODE->protocols & conf->protocols);
		612
		613	// mask out protocols we cannot establish
		614	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
		615	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		616
548	si.set (conf);	617	si.set (conf, protocol);
		618	}
		619
		620	// ensure sockinfo is valid, forward if necessary
		621	const sockinfo &
		622	connection::forward_si (const sockinfo &si) const
		623	{
		624	if (!si.valid ())
		625	{
		626	connection *r = vpn->find_router ();
		627
		628	if (r)
		629	{
		630	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),
		631	conf->nodename, r->conf->nodename);
		632	return r->si;
		633	}
		634	else
		635	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
		636	conf->nodename);
		637	}
		638
		639	return si;
		640	}
		641
		642	void
		643	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		644	{
		645	if (!vpn->send_vpn_packet (pkt, si, tos))
		646	reset_connection ();
549	}	647	}
550		648
551	void	649	void
552	connection::send_ping (const sockinfo &si, u8 pong)	650	connection::send_ping (const sockinfo &si, u8 pong)
553	{	651	{
…		…
575		673
576	void	674	void
577	connection::send_auth_request (const sockinfo &si, bool initiate)	675	connection::send_auth_request (const sockinfo &si, bool initiate)
578	{	676	{
579	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	677	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580
581	protocol = best_protocol (THISNODE->protocols & conf->protocols);
582		678
583	rsachallenge chg;	679	rsachallenge chg;
584		680
585	rsa_cache.gen (pkt->id, chg);	681	rsa_cache.gen (pkt->id, chg);
586		682
…		…
589	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	685	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590	fatal ("RSA_public_encrypt error");	686	fatal ("RSA_public_encrypt error");
591		687
592	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	688	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
593		689
594	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	690	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
595		691
596	delete pkt;	692	delete pkt;
597	}	693	}
598		694
599	void	695	void
…		…
627		723
628	delete r;	724	delete r;
629	}	725	}
630		726
631	void	727	void
632	connection::establish_connection_cb (tstamp &ts)	728	connection::establish_connection_cb (time_watcher &w)
633	{	729	{
634	if (ictx \|\| conf == THISNODE	730	if (ictx \|\| conf == THISNODE
635	\|\| connectmode == conf_node::C_NEVER	731	\|\| connectmode == conf_node::C_NEVER
636	\|\| connectmode == conf_node::C_DISABLED)	732	\|\| connectmode == conf_node::C_DISABLED)
637	ts = TSTAMP_CANCEL;	733	w.at = TSTAMP_CANCEL;
638	else if (ts <= NOW)	734	else if (w.at <= NOW)
639	{	735	{
640	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	736	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
641		737
642	if (retry_int < 3600 * 8)	738	if (retry_int < 3600 * 8)
643	retry_cnt++;	739	retry_cnt++;
644		740
645	ts = NOW + retry_int;	741	w.at = NOW + retry_int;
646		742
647	if (conf->hostname)	743	reset_si ();
		744
		745	if (si.prot && !si.host)
		746	vpn->send_connect_request (conf->id);
		747	else
648	{	748	{
649	reset_dstaddr ();	749	const sockinfo &dsi = forward_si (si);
		750
650	if (si.host && auth_rate_limiter.can (si))	751	if (dsi.valid () && auth_rate_limiter.can (dsi))
651	{	752	{
652	if (retry_cnt < 4)	753	if (retry_cnt < 4)
653	send_auth_request (si, true);	754	send_auth_request (dsi, true);
654	else	755	else
655	send_ping (si, 0);	756	send_ping (dsi, 0);
656	}	757	}
657	}	758	}
658	else
659	vpn->connect_request (conf->id);
660	}	759	}
661	}	760	}
662		761
663	void	762	void
664	connection::reset_connection ()	763	connection::reset_connection ()
…		…
693		792
694	reset_connection ();	793	reset_connection ();
695	}	794	}
696		795
697	void	796	void
698	connection::rekey_cb (tstamp &ts)	797	connection::rekey_cb (time_watcher &w)
699	{	798	{
700	ts = TSTAMP_CANCEL;	799	w.at = TSTAMP_CANCEL;
701		800
702	reset_connection ();	801	reset_connection ();
703	establish_connection ();	802	establish_connection ();
704	}	803	}
705		804
706	void	805	void
707	connection::send_data_packet (tap_packet *pkt, bool broadcast)	806	connection::send_data_packet (tap_packet *pkt)
708	{	807	{
709	vpndata_packet *p = new vpndata_packet;	808	vpndata_packet *p = new vpndata_packet;
710	int tos = 0;	809	int tos = 0;
711		810
712	if (conf->inherit_tos	811	// I am not hilarious about peeking into packets, but so be it.
713	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	812	if (conf->inherit_tos && pkt->is_ipv4 ())
714	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715	tos = (*pkt)[15] & IPTOS_TOS_MASK;	813	tos = (*pkt)[15] & IPTOS_TOS_MASK;
716		814
717	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	815	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
718	send_vpn_packet (p, si, tos);	816	send_vpn_packet (p, si, tos);
719		817
720	delete p;	818	delete p;
721		819
722	if (oseqno > MAX_SEQNO)	820	if (oseqno > MAX_SEQNO)
723	rekey ();	821	rekey ();
724	}	822	}
725		823
726	void	824	void
727	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	825	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
728	{	826	{
729	if (ictx && octx)	827	if (ictx && octx)
730	send_data_packet (pkt, broadcast);	828	send_data_packet (pkt);
731	else	829	else
732	{	830	{
733	if (!broadcast)//DDDD	831	if (!broadcast)//DDDD
734	queue.put (new tap_packet (*pkt));	832	data_queue.put (new tap_packet (*pkt));
		833
		834	establish_connection ();
		835	}
		836	}
		837
		838	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		839	{
		840	if (ictx && octx)
		841	send_vpn_packet (pkt, si, tos);
		842	else
		843	{
		844	vpn_queue.put (new vpn_packet (*pkt));
735		845
736	establish_connection ();	846	establish_connection ();
737	}	847	}
738	}	848	}
739		849
…		…
745	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	855	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
746	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	856	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
747		857
748	switch (pkt->typ ())	858	switch (pkt->typ ())
749	{	859	{
750	case vpn_packet::PT_PING:	860	case vpn_packet::PT_PING:
751	// we send pings instead of auth packets after some retries,	861	// we send pings instead of auth packets after some retries,
752	// so reset the retry counter and establish a connection	862	// so reset the retry counter and establish a connection
753	// when we receive a ping.	863	// when we receive a ping.
754	if (!ictx)	864	if (!ictx)
		865	{
		866	if (auth_rate_limiter.can (rsi))
		867	send_auth_request (rsi, true);
		868	}
		869	else
		870	send_ping (rsi, 1); // pong
		871
		872	break;
		873
		874	case vpn_packet::PT_PONG:
		875	break;
		876
		877	case vpn_packet::PT_RESET:
755	{	878	{
756	if (auth_rate_limiter.can (rsi))	879	reset_connection ();
757	send_auth_request (rsi, true);	880
		881	config_packet p = (config_packet ) pkt;
		882
		883	if (!p->chk_config ())
		884	{
		885	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		886	conf->nodename, (const char *)rsi);
		887	connectmode = conf_node::C_DISABLED;
		888	}
		889	else if (connectmode == conf_node::C_ALWAYS)
		890	establish_connection ();
758	}	891	}
759	else
760	send_ping (rsi, 1); // pong
761
762	break;	892	break;
763		893
764	case vpn_packet::PT_PONG:
765	break;
766
767	case vpn_packet::PT_RESET:	894	case vpn_packet::PT_AUTH_REQ:
768	{	895	if (auth_rate_limiter.can (rsi))
769	reset_connection ();
770
771	config_packet p = (config_packet ) pkt;
772
773	if (!p->chk_config ())
774	{	896	{
		897	auth_req_packet p = (auth_req_packet ) pkt;
		898
		899	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
		900
		901	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
		902	{
		903	if (p->prot_minor != PROTOCOL_MINOR)
		904	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		905	conf->nodename, (const char *)rsi,
		906	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		907
		908	if (p->initiate)
		909	send_auth_request (rsi, false);
		910
		911	rsachallenge k;
		912
		913	if (0 > RSA_private_decrypt (sizeof (p->encr),
		914	(unsigned char )&p->encr, (unsigned char )&k,
		915	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
		916	{
		917	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		918	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		919	break;
		920	}
		921	else
		922	{
		923	delete octx;
		924
		925	octx = new crypto_ctx (k, 1);
		926	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
		927
		928	conf->protocols = p->protocols;
		929
		930	send_auth_response (rsi, p->id, k);
		931
		932	connection_established ();
		933
		934	break;
		935	}
		936	}
		937	else
775	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	938	slog (L_WARN, _("%s(%s): protocol mismatch"),
776	conf->nodename, (const char *)rsi);	939	conf->nodename, (const char *)rsi);
777	connectmode = conf_node::C_DISABLED;	940
		941	send_reset (rsi);
778	}	942	}
779	else if (connectmode == conf_node::C_ALWAYS)	943
780	establish_connection ();
781	}
782	break;	944	break;
783		945
784	case vpn_packet::PT_AUTH_REQ:	946	case vpn_packet::PT_AUTH_RES:
785	if (auth_rate_limiter.can (rsi))
786	{	947	{
787	auth_req_packet p = (auth_req_packet ) pkt;	948	auth_res_packet p = (auth_res_packet ) pkt;
788		949
789	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	950	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
790		951
791	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	952	if (p->chk_config ())
792	{	953	{
793	if (p->prot_minor != PROTOCOL_MINOR)	954	if (p->prot_minor != PROTOCOL_MINOR)
794	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	955	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
795	conf->nodename, (const char *)rsi,	956	conf->nodename, (const char *)rsi,
796	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	957	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797		958
798	if (p->initiate)
799	send_auth_request (rsi, false);
800
801	rsachallenge k;	959	rsachallenge chg;
802		960
803	if (0 > RSA_private_decrypt (sizeof (p->encr),	961	if (!rsa_cache.find (p->id, chg))
804	(unsigned char )&p->encr, (unsigned char )&k,	962	{
805	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	963	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
806	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807	conf->nodename, (const char *)rsi);	964	conf->nodename, (const char *)rsi);
		965	break;
		966	}
808	else	967	else
809	{	968	{
810	retry_cnt = 0;	969	crypto_ctx *cctx = new crypto_ctx (chg, 0);
811	establish_connection.set (NOW + 8); //? ;)	970
812	keepalive.reset ();	971	if (!p->hmac_chk (cctx))
		972	{
		973	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
		974	"could be an attack, or just corruption or an synchronization error"),
		975	conf->nodename, (const char *)rsi);
		976	break;
		977	}
813	rekey.reset ();	978	else
		979	{
		980	rsaresponse h;
814		981
		982	rsa_hash (p->id, chg, h);
		983
		984	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
		985	{
		986	prot_minor = p->prot_minor;
		987
		988	delete ictx; ictx = cctx;
		989
		990	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
		991
		992	si = rsi;
		993	protocol = rsi.prot;
		994
		995	connection_established ();
		996
		997	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
		998	conf->nodename, (const char *)rsi,
		999	p->prot_major, p->prot_minor);
		1000
		1001	if (::conf.script_node_up)
		1002	run_script (run_script_cb (this, &connection::script_node_up), false);
		1003
		1004	break;
		1005	}
		1006	else
		1007	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
		1008	conf->nodename, (const char *)rsi);
		1009	}
		1010
815	delete ictx;	1011	delete cctx;
816	ictx = 0;
817
818	delete octx;
819
820	octx = new crypto_ctx (k, 1);
821	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
822
823	conf->protocols = p->protocols;
824	send_auth_response (rsi, p->id, k);
825
826	break;
827	}	1012	}
828	}	1013	}
829
830	send_reset (rsi);
831	}	1014	}
832		1015
		1016	send_reset (rsi);
833	break;	1017	break;
834		1018
835	case vpn_packet::PT_AUTH_RES:	1019	case vpn_packet::PT_DATA_COMPRESSED:
836	{	1020	#if !ENABLE_COMPRESSION
837	auth_res_packet p = (auth_res_packet ) pkt;	1021	send_reset (rsi);
		1022	break;
		1023	#endif
838		1024
839	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1025	case vpn_packet::PT_DATA_UNCOMPRESSED:
840		1026
841	if (p->chk_config ())	1027	if (ictx && octx)
842	{	1028	{
843	if (p->prot_minor != PROTOCOL_MINOR)	1029	vpndata_packet p = (vpndata_packet )pkt;
844	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
845	conf->nodename, (const char *)rsi,
846	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
847		1030
848	rsachallenge chg;	1031	if (!p->hmac_chk (ictx))
849		1032	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850	if (!rsa_cache.find (p->id, chg))	1033	"could be an attack, or just corruption or an synchronization error"),
851	slog (L_ERR, _("%s(%s): unrequested auth response"),
852	conf->nodename, (const char *)rsi);	1034	conf->nodename, (const char *)rsi);
853	else	1035	else
854	{	1036	{
855	crypto_ctx *cctx = new crypto_ctx (chg, 0);
856
857	if (!p->hmac_chk (cctx))
858	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
859	"could be an attack, or just corruption or an synchronization error"),
860	conf->nodename, (const char *)rsi);
861	else	1037	u32 seqno;
		1038	tap_packet *d = p->unpack (this, seqno);
		1039
		1040	if (iseqno.recv_ok (seqno))
862	{	1041	{
863	rsaresponse h;	1042	vpn->tap->send (d);
864		1043
865	rsa_hash (p->id, chg, h);	1044	if (si != rsi)
866
867	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
868	{	1045	{
869	prot_minor = p->prot_minor;	1046	// fast re-sync on connection changes, useful especially for tcp/ip
870
871	delete ictx; ictx = cctx;
872
873	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
874
875	si = rsi;	1047	si = rsi;
876		1048
877	rekey.set (NOW + ::conf.rekey);	1049	slog (L_INFO, _("%s(%s): socket address changed to %s"),
878	keepalive.set (NOW + ::conf.keepalive);
879
880	// send queued packets
881	while (tap_packet *p = queue.get ())
882	{
883	send_data_packet (p);
884	delete p;
885	}
886
887	connectmode = conf->connectmode;
888
889	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
890	conf->nodename, (const char *)rsi,	1050	conf->nodename, (const char )si, (const char )rsi);
891	strprotocol (protocol),
892	p->prot_major, p->prot_minor);
893
894	if (::conf.script_node_up)
895	run_script (run_script_cb (this, &connection::script_node_up), false);
896
897	break;
898	}	1051	}
		1052
899	else	1053	delete d;
900	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1054
901	conf->nodename, (const char *)rsi);	1055	break;
902	}	1056	}
903
904	delete cctx;
905	}	1057	}
906	}	1058	}
907	}
908		1059
909	send_reset (rsi);	1060	send_reset (rsi);
910	break;	1061	break;
911		1062
912	case vpn_packet::PT_DATA_COMPRESSED:
913	#if !ENABLE_COMPRESSION
914	send_reset (rsi);
915	break;
916	#endif
917
918	case vpn_packet::PT_DATA_UNCOMPRESSED:
919
920	if (ictx && octx)
921	{
922	vpndata_packet p = (vpndata_packet )pkt;
923
924	if (rsi == si)
925	{
926	if (!p->hmac_chk (ictx))
927	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
928	"could be an attack, or just corruption or an synchronization error"),
929	conf->nodename, (const char *)rsi);
930	else
931	{
932	u32 seqno;
933	tap_packet *d = p->unpack (this, seqno);
934
935	if (iseqno.recv_ok (seqno))
936	{
937	vpn->tap->send (d);
938
939	if (p->dst () == 0) // re-broadcast
940	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
941	{
942	connection c = i;
943
944	if (c->conf != THISNODE && c->conf != conf)
945	c->inject_data_packet (d);
946	}
947
948	delete d;
949
950	break;
951	}
952	}
953	}
954	else
955	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
956	}
957
958	send_reset (rsi);
959	break;
960
961	case vpn_packet::PT_CONNECT_REQ:	1063	case vpn_packet::PT_CONNECT_REQ:
962	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1064	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963	{	1065	{
964	connect_req_packet p = (connect_req_packet ) pkt;	1066	connect_req_packet p = (connect_req_packet ) pkt;
965		1067
966	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1068	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
967	conf->protocols = p->protocols;
968	connection *c = vpn->conns[p->id - 1];	1069	connection *c = vpn->conns[p->id - 1];
		1070	conf->protocols = p->protocols;
969		1071
970	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1072	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
971	conf->id, p->id, c->ictx && c->octx);	1073	conf->id, p->id, c->ictx && c->octx);
972		1074
973	if (c->ictx && c->octx)	1075	if (c->ictx && c->octx)
974	{	1076	{
975	// send connect_info packets to both sides, in case one is	1077	// send connect_info packets to both sides, in case one is
976	// behind a nat firewall (or both ;)	1078	// behind a nat firewall (or both ;)
977	c->send_connect_info (conf->id, si, conf->protocols);	1079	c->send_connect_info (conf->id, si, conf->protocols);
978	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1080	send_connect_info (c->conf->id, c->si, c->conf->protocols);
979	}	1081	}
		1082	else
		1083	c->establish_connection ();
980	}	1084	}
981		1085
982	break;	1086	break;
983		1087
984	case vpn_packet::PT_CONNECT_INFO:	1088	case vpn_packet::PT_CONNECT_INFO:
985	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1089	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986	{	1090	{
987	connect_info_packet p = (connect_info_packet ) pkt;	1091	connect_info_packet p = (connect_info_packet ) pkt;
988		1092
989	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1093	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
990	conf->protocols = p->protocols;	1094
991	connection *c = vpn->conns[p->id - 1];	1095	connection *c = vpn->conns[p->id - 1];
992		1096
		1097	c->conf->protocols = p->protocols;
		1098	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1099	p->si.upgrade_protocol (protocol, c->conf);
		1100
993	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1101	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
994	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1102	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
995		1103
		1104	const sockinfo &dsi = forward_si (p->si);
		1105
		1106	if (dsi.valid ())
996	c->send_auth_request (p->si, true);	1107	c->send_auth_request (dsi, true);
997	}	1108	}
998		1109
999	break;	1110	break;
1000		1111
1001	default:	1112	default:
1002	send_reset (rsi);	1113	send_reset (rsi);
1003	break;	1114	break;
1004
1005	}	1115	}
1006	}	1116	}
1007		1117
1008	void connection::keepalive_cb (tstamp &ts)	1118	void connection::keepalive_cb (time_watcher &w)
1009	{	1119	{
1010	if (NOW >= last_activity + ::conf.keepalive + 30)	1120	if (NOW >= last_activity + ::conf.keepalive + 30)
1011	{	1121	{
1012	reset_connection ();	1122	reset_connection ();
1013	establish_connection ();	1123	establish_connection ();
1014	}	1124	}
1015	else if (NOW < last_activity + ::conf.keepalive)	1125	else if (NOW < last_activity + ::conf.keepalive)
1016	ts = last_activity + ::conf.keepalive;	1126	w.at = last_activity + ::conf.keepalive;
1017	else if (conf->connectmode != conf_node::C_ONDEMAND	1127	else if (conf->connectmode != conf_node::C_ONDEMAND
1018	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1128	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1019	{	1129	{
1020	send_ping (si);	1130	send_ping (si);
1021	ts = NOW + 5;	1131	w.at = NOW + 5;
1022	}	1132	}
		1133	else if (NOW < last_activity + ::conf.keepalive + 10)
		1134	// hold ondemand connections implicitly a few seconds longer
		1135	// should delete octx, though, or something like that ;)
		1136	w.at = last_activity + ::conf.keepalive + 10;
1023	else	1137	else
1024	reset_connection ();	1138	reset_connection ();
1025	}	1139	}
1026		1140
1027	void connection::connect_request (int id)	1141	void connection::send_connect_request (int id)
1028	{	1142	{
1029	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1143	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1030		1144
1031	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1145	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1032	p->hmac_set (octx);	1146	p->hmac_set (octx);
…		…
1035	delete p;	1149	delete p;
1036	}	1150	}
1037		1151
1038	void connection::script_node ()	1152	void connection::script_node ()
1039	{	1153	{
1040	vpn->script_if_up (0);	1154	vpn->script_if_up ();
1041		1155
1042	char *env;	1156	char *env;
1043	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1157	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1044	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1158	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1159	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1160	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047	}	1161	}
1048		1162
1049	const char *connection::script_node_up (int)	1163	const char *connection::script_node_up ()
1050	{	1164	{
1051	script_node ();	1165	script_node ();
1052		1166
1053	putenv ("STATE=up");	1167	putenv ("STATE=up");
1054		1168
1055	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1169	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1056	}	1170	}
1057		1171
1058	const char *connection::script_node_down (int)	1172	const char *connection::script_node_down ()
1059	{	1173	{
1060	script_node ();	1174	script_node ();
1061		1175
1062	putenv ("STATE=down");	1176	putenv ("STATE=down");
1063		1177
1064	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1178	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1065	}
1066
1067	// send a vpn packet out to other hosts
1068	void
1069	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1070	{
1071	if (protocol & PROT_IPv4)
1072	vpn->send_ipv4_packet (pkt, si, tos);
1073	else
1074	vpn->send_udpv4_packet (pkt, si, tos);
1075	}	1179	}
1076		1180
1077	connection::connection(struct vpn *vpn_)	1181	connection::connection(struct vpn *vpn_)
1078	: vpn(vpn_)	1182	: vpn(vpn_)
1079	, rekey (this, &connection::rekey_cb)	1183	, rekey (this, &connection::rekey_cb)

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Comparing gvpe/src/connection.C (file contents): Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs. Revision 1.23 by pcg, Wed Oct 22 00:42:53 2003 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.1 by pcg, Wed Apr 2 03:06:22 2003 UTC vs.
Revision 1.23 by pcg, Wed Oct 22 00:42:53 2003 UTC