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

Comparing gvpe/src/connection.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.13 by pcg, Fri Aug 8 07:52:26 2003 UTC

…		…
85	rsachallenge chg;	85	rsachallenge chg;
86	};	86	};
87		87
88	struct rsa_cache : list<rsa_entry>	88	struct rsa_cache : list<rsa_entry>
89	{	89	{
90	void cleaner_cb (tstamp &ts); time_watcher cleaner;	90	void cleaner_cb (time_watcher &w); time_watcher cleaner;
91		91
92	bool find (const rsaid &id, rsachallenge &chg)	92	bool find (const rsaid &id, rsachallenge &chg)
93	{	93	{
94	for (iterator i = begin (); i != end (); ++i)	94	for (iterator i = begin (); i != end (); ++i)
95	{	95	{
…		…
129	: cleaner (this, &rsa_cache::cleaner_cb)	129	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	130	{ }
131		131
132	} rsa_cache;	132	} rsa_cache;
133		133
134	void rsa_cache::cleaner_cb (tstamp &ts)	134	void rsa_cache::cleaner_cb (time_watcher &w)
135	{	135	{
136	if (empty ())	136	if (empty ())
137	ts = TSTAMP_CANCEL;	137	w.at = TSTAMP_CANCEL;
138	else	138	else
139	{	139	{
140	ts = NOW + RSA_TTL;	140	w.at = NOW + RSA_TTL;
141		141
142	for (iterator i = begin (); i != end (); )	142	for (iterator i = begin (); i != end (); )
143	if (i->expire <= NOW)	143	if (i->expire <= NOW)
144	i = erase (i);	144	i = erase (i);
145	else	145	else
…		…
147	}	147	}
148	}	148	}
149		149
150	//////////////////////////////////////////////////////////////////////////////	150	//////////////////////////////////////////////////////////////////////////////
151		151
152	void pkt_queue::put (tap_packet *p)	152	void pkt_queue::put (net_packet *p)
153	{	153	{
154	if (queue[i])	154	if (queue[i])
155	{	155	{
156	delete queue[i];	156	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;	157	j = (j + 1) % QUEUEDEPTH;
…		…
160	queue[i] = p;	160	queue[i] = p;
161		161
162	i = (i + 1) % QUEUEDEPTH;	162	i = (i + 1) % QUEUEDEPTH;
163	}	163	}
164		164
165	tap_packet *pkt_queue::get ()	165	net_packet *pkt_queue::get ()
166	{	166	{
167	tap_packet *p = queue[j];	167	net_packet *p = queue[j];
168		168
169	if (p)	169	if (p)
170	{	170	{
171	queue[j] = 0;	171	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;	172	j = (j + 1) % QUEUEDEPTH;
…		…
197	// only do action once every x seconds per host whole allowing bursts.	197	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	198	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	199	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	200	struct net_rate_limiter : list<net_rateinfo>
201	{	201	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	202	static const double ALPHA = 1. - 1. / 180.; // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	203	static const double CUTOFF = 10.; // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
		205	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value
205		206
206	bool can (const sockinfo &si) { return can((u32)si.host); }	207	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	208	bool can (u32 host);
208	};	209	};
209		210
…		…
225	{	226	{
226	net_rateinfo ri;	227	net_rateinfo ri;
227		228
228	ri.host = host;	229	ri.host = host;
229	ri.pcnt = 1.;	230	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	231	ri.diff = MAXDIF;
231	ri.last = NOW;	232	ri.last = NOW;
232		233
233	push_front (ri);	234	push_front (ri);
234		235
235	return true;	236	return true;
…		…
242	ri.pcnt = ri.pcnt * ALPHA;	243	ri.pcnt = ri.pcnt * ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
244		245
245	ri.last = NOW;	246	ri.last = NOW;
246		247
		248	double dif = ri.diff / ri.pcnt;
		249
247	bool send = ri.diff / ri.pcnt > CUTOFF;	250	bool send = dif > CUTOFF;
248		251
		252	if (dif > MAXDIF)
		253	{
		254	ri.pcnt = 1.;
		255	ri.diff = MAXDIF;
		256	}
249	if (send)	257	else if (send)
250	ri.pcnt++;	258	ri.pcnt++;
251		259
252	push_front (ri);	260	push_front (ri);
253		261
254	return send;	262	return send;
…		…
285	hmac_gen (ctx);	293	hmac_gen (ctx);
286		294
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	295	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	296	}
289		297
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	299	{
292	this->type = type;	300	type = type_;
293		301
294	int src = THISNODE->id;	302	int src = THISNODE->id;
295		303
296	src1 = src;	304	src1 = src;
297	srcdst = ((src >> 8) << 4) \| (dst >> 8);	305	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
546	};	554	};
547		555
548	/////////////////////////////////////////////////////////////////////////////	556	/////////////////////////////////////////////////////////////////////////////
549		557
550	void	558	void
		559	connection::connection_established ()
		560	{
		561	if (ictx && octx)
		562	{
		563	connectmode = conf->connectmode;
		564
		565	rekey.start (NOW + ::conf.rekey);
		566	keepalive.start (NOW + ::conf.keepalive);
		567
		568	// send queued packets
		569	if (ictx && octx)
		570	{
		571	while (tap_packet p = (tap_packet )data_queue.get ())
		572	{
		573	send_data_packet (p);
		574	delete p;
		575	}
		576
		577	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		578	{
		579	send_vpn_packet (p, si, IPTOS_RELIABILITY);
		580	delete p;
		581	}
		582	}
		583	}
		584	else
		585	{
		586	retry_cnt = 0;
		587	establish_connection.start (NOW + 5);
		588	keepalive.reset ();
		589	rekey.reset ();
		590	}
		591	}
		592
		593	void
551	connection::reset_dstaddr ()	594	connection::reset_si ()
552	{	595	{
553	si.set (conf);
554	}
555
556	void
557	connection::send_ping (const sockinfo &si, u8 pong)
558	{
559	ping_packet *pkt = new ping_packet;
560
561	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
562	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
563
564	delete pkt;
565	}
566
567	void
568	connection::send_reset (const sockinfo &si)
569	{
570	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
571	{
572	config_packet *pkt = new config_packet;
573
574	pkt->setup (vpn_packet::PT_RESET, conf->id);
575	send_vpn_packet (pkt, si, IPTOS_MINCOST);
576
577	delete pkt;
578	}
579	}
580
581	void
582	connection::send_auth_request (const sockinfo &si, bool initiate)
583	{
584	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
585
586	protocol = best_protocol (THISNODE->protocols & conf->protocols);	596	protocol = best_protocol (THISNODE->protocols & conf->protocols);
587		597
588	// mask out protocols we cannot establish	598	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	599	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	600	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591		601
592	if (protocol)	602	si.set (conf, protocol);
		603	}
		604
		605	// ensure sockinfo is valid, forward if necessary
		606	const sockinfo &
		607	connection::forward_si (const sockinfo &si) const
		608	{
		609	if (!si.valid ())
		610	{
		611	connection *r = vpn->find_router ();
		612
		613	if (r)
		614	{
		615	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),
		616	conf->nodename, r->conf->nodename);
		617	return r->si;
		618	}
		619	else
		620	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
		621	conf->nodename);
593	{	622	}
594	rsachallenge chg;
595		623
596	rsa_cache.gen (pkt->id, chg);	624	return si;
		625	}
597		626
598	if (0 > RSA_public_encrypt (sizeof chg,	627	void
599	(unsigned char )&chg, (unsigned char )&pkt->encr,	628	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	629	{
601	fatal ("RSA_public_encrypt error");	630	if (!vpn->send_vpn_packet (pkt, si, tos))
		631	reset_connection ();
		632	}
602		633
603	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	634	void
		635	connection::send_ping (const sockinfo &si, u8 pong)
		636	{
		637	ping_packet *pkt = new ping_packet;
604		638
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	639	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		640	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		641
		642	delete pkt;
		643	}
		644
		645	void
		646	connection::send_reset (const sockinfo &si)
		647	{
		648	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		649	{
		650	config_packet *pkt = new config_packet;
		651
		652	pkt->setup (vpn_packet::PT_RESET, conf->id);
		653	send_vpn_packet (pkt, si, IPTOS_MINCOST);
606		654
607	delete pkt;	655	delete pkt;
608	}	656	}
609	else	657	}
610	; // silently fail	658
		659	void
		660	connection::send_auth_request (const sockinfo &si, bool initiate)
		661	{
		662	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		663
		664	rsachallenge chg;
		665
		666	rsa_cache.gen (pkt->id, chg);
		667
		668	if (0 > RSA_public_encrypt (sizeof chg,
		669	(unsigned char )&chg, (unsigned char )&pkt->encr,
		670	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
		671	fatal ("RSA_public_encrypt error");
		672
		673	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
		674
		675	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
		676
		677	delete pkt;
611	}	678	}
612		679
613	void	680	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	681	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
615	{	682	{
…		…
641		708
642	delete r;	709	delete r;
643	}	710	}
644		711
645	void	712	void
646	connection::establish_connection_cb (tstamp &ts)	713	connection::establish_connection_cb (time_watcher &w)
647	{	714	{
648	if (ictx \|\| conf == THISNODE	715	if (ictx \|\| conf == THISNODE
649	\|\| connectmode == conf_node::C_NEVER	716	\|\| connectmode == conf_node::C_NEVER
650	\|\| connectmode == conf_node::C_DISABLED)	717	\|\| connectmode == conf_node::C_DISABLED)
651	ts = TSTAMP_CANCEL;	718	w.at = TSTAMP_CANCEL;
652	else if (ts <= NOW)	719	else if (w.at <= NOW)
653	{	720	{
654	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	721	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
655		722
656	if (retry_int < 3600 * 8)	723	if (retry_int < 3600 * 8)
657	retry_cnt++;	724	retry_cnt++;
658		725
659	ts = NOW + retry_int;	726	w.at = NOW + retry_int;
660		727
661	if (conf->hostname)	728	reset_si ();
		729
		730	if (si.prot && !si.host)
		731	vpn->send_connect_request (conf->id);
		732	else
662	{	733	{
663	reset_dstaddr ();	734	const sockinfo &dsi = forward_si (si);
		735
664	if (si.host && auth_rate_limiter.can (si))	736	if (dsi.valid () && auth_rate_limiter.can (dsi))
665	{	737	{
666	if (retry_cnt < 4)	738	if (retry_cnt < 4)
667	send_auth_request (si, true);	739	send_auth_request (dsi, true);
668	else	740	else
669	send_ping (si, 0);	741	send_ping (dsi, 0);
670	}	742	}
671	}	743	}
672	else
673	vpn->connect_request (conf->id);
674	}	744	}
675	}	745	}
676		746
677	void	747	void
678	connection::reset_connection ()	748	connection::reset_connection ()
…		…
707		777
708	reset_connection ();	778	reset_connection ();
709	}	779	}
710		780
711	void	781	void
712	connection::rekey_cb (tstamp &ts)	782	connection::rekey_cb (time_watcher &w)
713	{	783	{
714	ts = TSTAMP_CANCEL;	784	w.at = TSTAMP_CANCEL;
715		785
716	reset_connection ();	786	reset_connection ();
717	establish_connection ();	787	establish_connection ();
718	}	788	}
719		789
…		…
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	791	connection::send_data_packet (tap_packet *pkt, bool broadcast)
722	{	792	{
723	vpndata_packet *p = new vpndata_packet;	793	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	794	int tos = 0;
725		795
		796	// I am not hilarious about peeking into packets, but so be it.
726	if (conf->inherit_tos	797	if (conf->inherit_tos
727	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	798	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4	799	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	800	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		801
…		…
743	if (ictx && octx)	814	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	815	send_data_packet (pkt, broadcast);
745	else	816	else
746	{	817	{
747	if (!broadcast)//DDDD	818	if (!broadcast)//DDDD
748	queue.put (new tap_packet (*pkt));	819	data_queue.put (new tap_packet (*pkt));
		820
		821	establish_connection ();
		822	}
		823	}
		824
		825	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		826	{
		827	if (ictx && octx)
		828	send_vpn_packet (pkt, si, tos);
		829	else
		830	{
		831	vpn_queue.put (new vpn_packet (*pkt));
749		832
750	establish_connection ();	833	establish_connection ();
751	}	834	}
752	}	835	}
753		836
…		…
759	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	842	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
760	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	843	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
761		844
762	switch (pkt->typ ())	845	switch (pkt->typ ())
763	{	846	{
764	case vpn_packet::PT_PING:	847	case vpn_packet::PT_PING:
765	// we send pings instead of auth packets after some retries,	848	// we send pings instead of auth packets after some retries,
766	// so reset the retry counter and establish a connection	849	// so reset the retry counter and establish a connection
767	// when we receive a ping.	850	// when we receive a ping.
768	if (!ictx)	851	if (!ictx)
		852	{
		853	if (auth_rate_limiter.can (rsi))
		854	send_auth_request (rsi, true);
		855	}
		856	else
		857	send_ping (rsi, 1); // pong
		858
		859	break;
		860
		861	case vpn_packet::PT_PONG:
		862	break;
		863
		864	case vpn_packet::PT_RESET:
769	{	865	{
770	if (auth_rate_limiter.can (rsi))	866	reset_connection ();
771	send_auth_request (rsi, true);	867
		868	config_packet p = (config_packet ) pkt;
		869
		870	if (!p->chk_config ())
		871	{
		872	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		873	conf->nodename, (const char *)rsi);
		874	connectmode = conf_node::C_DISABLED;
		875	}
		876	else if (connectmode == conf_node::C_ALWAYS)
		877	establish_connection ();
772	}	878	}
773	else
774	send_ping (rsi, 1); // pong
775
776	break;	879	break;
777		880
778	case vpn_packet::PT_PONG:
779	break;
780
781	case vpn_packet::PT_RESET:	881	case vpn_packet::PT_AUTH_REQ:
782	{	882	if (auth_rate_limiter.can (rsi))
783	reset_connection ();
784
785	config_packet p = (config_packet ) pkt;
786
787	if (!p->chk_config ())
788	{	883	{
789	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	884	auth_req_packet p = (auth_req_packet ) pkt;
		885
		886	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
		887
		888	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
		889	{
		890	if (p->prot_minor != PROTOCOL_MINOR)
		891	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		892	conf->nodename, (const char *)rsi,
		893	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		894
		895	if (p->initiate)
		896	send_auth_request (rsi, false);
		897
		898	rsachallenge k;
		899
		900	if (0 > RSA_private_decrypt (sizeof (p->encr),
		901	(unsigned char )&p->encr, (unsigned char )&k,
		902	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
		903	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
790	conf->nodename, (const char *)rsi);	904	conf->nodename, (const char *)rsi);
791	connectmode = conf_node::C_DISABLED;	905	else
		906	{
		907	delete octx;
		908
		909	octx = new crypto_ctx (k, 1);
		910	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
		911
		912	conf->protocols = p->protocols;
		913
		914	send_auth_response (rsi, p->id, k);
		915
		916	connection_established ();
		917
		918	break;
		919	}
		920	}
		921
		922	send_reset (rsi);
792	}	923	}
793	else if (connectmode == conf_node::C_ALWAYS)	924
794	establish_connection ();
795	}
796	break;	925	break;
797		926
798	case vpn_packet::PT_AUTH_REQ:	927	case vpn_packet::PT_AUTH_RES:
799	if (auth_rate_limiter.can (rsi))
800	{	928	{
801	auth_req_packet p = (auth_req_packet ) pkt;	929	auth_res_packet p = (auth_res_packet ) pkt;
802		930
803	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	931	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
804		932
805	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	933	if (p->chk_config ())
806	{	934	{
807	if (p->prot_minor != PROTOCOL_MINOR)	935	if (p->prot_minor != PROTOCOL_MINOR)
808	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	936	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
809	conf->nodename, (const char *)rsi,	937	conf->nodename, (const char *)rsi,
810	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	938	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
811		939
812	if (p->initiate)
813	send_auth_request (rsi, false);
814
815	rsachallenge k;	940	rsachallenge chg;
816		941
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	942	if (!rsa_cache.find (p->id, chg))
818	(unsigned char )&p->encr, (unsigned char )&k,	943	{
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	944	slog (L_ERR, _("%s(%s): unrequested auth response"),
820	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
821	conf->nodename, (const char *)rsi);	945	conf->nodename, (const char *)rsi);
		946	break;
		947	}
822	else	948	else
823	{	949	{
824	retry_cnt = 0;	950	crypto_ctx *cctx = new crypto_ctx (chg, 0);
825	establish_connection.set (NOW + 8); //? ;)	951
826	keepalive.reset ();	952	if (!p->hmac_chk (cctx))
		953	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
		954	"could be an attack, or just corruption or an synchronization error"),
		955	conf->nodename, (const char *)rsi);
827	rekey.reset ();	956	else
		957	{
		958	rsaresponse h;
828		959
		960	rsa_hash (p->id, chg, h);
		961
		962	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
		963	{
		964	prot_minor = p->prot_minor;
		965
		966	delete ictx; ictx = cctx;
		967
		968	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
		969
		970	si = rsi;
		971	protocol = rsi.prot;
		972
		973	connection_established ();
		974
		975	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
		976	conf->nodename, (const char *)rsi,
		977	p->prot_major, p->prot_minor);
		978
		979	if (::conf.script_node_up)
		980	run_script (run_script_cb (this, &connection::script_node_up), false);
		981
		982	break;
		983	}
		984	else
		985	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
		986	conf->nodename, (const char *)rsi);
		987	}
		988
829	delete ictx;	989	delete cctx;
830	ictx = 0;
831
832	delete octx;
833
834	octx = new crypto_ctx (k, 1);
835	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
836
837	conf->protocols = p->protocols;
838	send_auth_response (rsi, p->id, k);
839
840	break;
841	}	990	}
842	}	991	}
843
844	send_reset (rsi);
845	}	992	}
846		993
		994	send_reset (rsi);
847	break;	995	break;
848		996
849	case vpn_packet::PT_AUTH_RES:	997	case vpn_packet::PT_DATA_COMPRESSED:
850	{	998	#if !ENABLE_COMPRESSION
851	auth_res_packet p = (auth_res_packet ) pkt;	999	send_reset (rsi);
		1000	break;
		1001	#endif
852		1002
853	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1003	case vpn_packet::PT_DATA_UNCOMPRESSED:
854		1004
855	if (p->chk_config ())	1005	if (ictx && octx)
856	{	1006	{
857	if (p->prot_minor != PROTOCOL_MINOR)	1007	vpndata_packet p = (vpndata_packet )pkt;
858	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
859	conf->nodename, (const char *)rsi,
860	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
861		1008
862	rsachallenge chg;	1009	if (!p->hmac_chk (ictx))
863		1010	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
864	if (!rsa_cache.find (p->id, chg))	1011	"could be an attack, or just corruption or an synchronization error"),
865	slog (L_ERR, _("%s(%s): unrequested auth response"),
866	conf->nodename, (const char *)rsi);	1012	conf->nodename, (const char *)rsi);
867	else	1013	else
868	{	1014	{
869	crypto_ctx *cctx = new crypto_ctx (chg, 0);
870
871	if (!p->hmac_chk (cctx))
872	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
873	"could be an attack, or just corruption or an synchronization error"),
874	conf->nodename, (const char *)rsi);
875	else	1015	u32 seqno;
		1016	tap_packet *d = p->unpack (this, seqno);
		1017
		1018	if (iseqno.recv_ok (seqno))
876	{	1019	{
877	rsaresponse h;	1020	vpn->tap->send (d);
878		1021
879	rsa_hash (p->id, chg, h);	1022	if (p->dst () == 0) // re-broadcast
		1023	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
		1024	{
		1025	connection c = i;
880		1026
881	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))	1027	if (c->conf != THISNODE && c->conf != conf)
		1028	c->inject_data_packet (d);
		1029	}
		1030
		1031	if (si != rsi)
882	{	1032	{
883	prot_minor = p->prot_minor;	1033	// fast re-sync on conneciton changes, useful especially for tcp/ip
884
885	delete ictx; ictx = cctx;
886
887	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
888
889	si = rsi;	1034	si = rsi;
890		1035
891	rekey.set (NOW + ::conf.rekey);	1036	slog (L_INFO, _("%s(%s): socket address changed to %s"),
892	keepalive.set (NOW + ::conf.keepalive);
893
894	// send queued packets
895	while (tap_packet *p = queue.get ())
896	{
897	send_data_packet (p);
898	delete p;
899	}
900
901	connectmode = conf->connectmode;
902
903	slog (L_INFO, _("%s(%s): %s connection established, protocol version %d.%d"),
904	conf->nodename, (const char *)rsi,	1037	conf->nodename, (const char )si, (const char )rsi);
905	strprotocol (protocol),
906	p->prot_major, p->prot_minor);
907
908	if (::conf.script_node_up)
909	run_script (run_script_cb (this, &connection::script_node_up), false);
910
911	break;
912	}	1038	}
		1039
913	else	1040	delete d;
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1041
915	conf->nodename, (const char *)rsi);	1042	break;
916	}	1043	}
917
918	delete cctx;
919	}	1044	}
920	}	1045	}
921	}
922		1046
923	send_reset (rsi);	1047	send_reset (rsi);
924	break;	1048	break;
925		1049
926	case vpn_packet::PT_DATA_COMPRESSED:
927	#if !ENABLE_COMPRESSION
928	send_reset (rsi);
929	break;
930	#endif
931
932	case vpn_packet::PT_DATA_UNCOMPRESSED:
933
934	if (ictx && octx)
935	{
936	vpndata_packet p = (vpndata_packet )pkt;
937
938	if (rsi == si)
939	{
940	if (!p->hmac_chk (ictx))
941	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
942	"could be an attack, or just corruption or an synchronization error"),
943	conf->nodename, (const char *)rsi);
944	else
945	{
946	u32 seqno;
947	tap_packet *d = p->unpack (this, seqno);
948
949	if (iseqno.recv_ok (seqno))
950	{
951	vpn->tap->send (d);
952
953	if (p->dst () == 0) // re-broadcast
954	for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
955	{
956	connection c = i;
957
958	if (c->conf != THISNODE && c->conf != conf)
959	c->inject_data_packet (d);
960	}
961
962	delete d;
963
964	break;
965	}
966	}
967	}
968	else
969	slog (L_ERR, _("received data packet from unknown source %s"), (const char *)rsi);
970	}
971
972	send_reset (rsi);
973	break;
974
975	case vpn_packet::PT_CONNECT_REQ:	1050	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1051	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1052	{
978	connect_req_packet p = (connect_req_packet ) pkt;	1053	connect_req_packet p = (connect_req_packet ) pkt;
979		1054
980	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1055	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
981	conf->protocols = p->protocols;
982	connection *c = vpn->conns[p->id - 1];	1056	connection *c = vpn->conns[p->id - 1];
		1057	conf->protocols = p->protocols;
983		1058
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1059	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985	conf->id, p->id, c->ictx && c->octx);	1060	conf->id, p->id, c->ictx && c->octx);
986		1061
987	if (c->ictx && c->octx)	1062	if (c->ictx && c->octx)
988	{	1063	{
989	// send connect_info packets to both sides, in case one is	1064	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1065	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1066	c->send_connect_info (conf->id, si, conf->protocols);
992	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1067	send_connect_info (c->conf->id, c->si, c->conf->protocols);
993	}	1068	}
		1069	else
		1070	c->establish_connection ();
994	}	1071	}
995		1072
996	break;	1073	break;
997		1074
998	case vpn_packet::PT_CONNECT_INFO:	1075	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1077	{
1001	connect_info_packet p = (connect_info_packet ) pkt;	1078	connect_info_packet p = (connect_info_packet ) pkt;
1002		1079
1003	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1080	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
1004	conf->protocols = p->protocols;	1081
1005	connection *c = vpn->conns[p->id - 1];	1082	connection *c = vpn->conns[p->id - 1];
1006		1083
		1084	c->conf->protocols = p->protocols;
		1085	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1086	p->si.upgrade_protocol (protocol, c->conf);
		1087
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1088	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1089	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1009		1090
		1091	const sockinfo &dsi = forward_si (p->si);
		1092
		1093	if (dsi.valid ())
1010	c->send_auth_request (p->si, true);	1094	c->send_auth_request (dsi, true);
1011	}	1095	}
1012		1096
1013	break;	1097	break;
1014		1098
1015	default:	1099	default:
1016	send_reset (rsi);	1100	send_reset (rsi);
1017	break;	1101	break;
1018
1019	}	1102	}
1020	}	1103	}
1021		1104
1022	void connection::keepalive_cb (tstamp &ts)	1105	void connection::keepalive_cb (time_watcher &w)
1023	{	1106	{
1024	if (NOW >= last_activity + ::conf.keepalive + 30)	1107	if (NOW >= last_activity + ::conf.keepalive + 30)
1025	{	1108	{
1026	reset_connection ();	1109	reset_connection ();
1027	establish_connection ();	1110	establish_connection ();
1028	}	1111	}
1029	else if (NOW < last_activity + ::conf.keepalive)	1112	else if (NOW < last_activity + ::conf.keepalive)
1030	ts = last_activity + ::conf.keepalive;	1113	w.at = last_activity + ::conf.keepalive;
1031	else if (conf->connectmode != conf_node::C_ONDEMAND	1114	else if (conf->connectmode != conf_node::C_ONDEMAND
1032	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1115	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1033	{	1116	{
1034	send_ping (si);	1117	send_ping (si);
1035	ts = NOW + 5;	1118	w.at = NOW + 5;
1036	}	1119	}
		1120	else if (NOW < last_activity + ::conf.keepalive + 10)
		1121	// hold ondemand connections implicitly a few seconds longer
		1122	// should delete octx, though, or something like that ;)
		1123	w.at = last_activity + ::conf.keepalive + 10;
1037	else	1124	else
1038	reset_connection ();	1125	reset_connection ();
1039	}	1126	}
1040		1127
1041	void connection::connect_request (int id)	1128	void connection::send_connect_request (int id)
1042	{	1129	{
1043	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1130	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1044		1131
1045	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1132	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1046	p->hmac_set (octx);	1133	p->hmac_set (octx);
…		…
1049	delete p;	1136	delete p;
1050	}	1137	}
1051		1138
1052	void connection::script_node ()	1139	void connection::script_node ()
1053	{	1140	{
1054	vpn->script_if_up (0);	1141	vpn->script_if_up ();
1055		1142
1056	char *env;	1143	char *env;
1057	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1144	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1058	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1145	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1059	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1146	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1060	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1147	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1061	}	1148	}
1062		1149
1063	const char *connection::script_node_up (int)	1150	const char *connection::script_node_up ()
1064	{	1151	{
1065	script_node ();	1152	script_node ();
1066		1153
1067	putenv ("STATE=up");	1154	putenv ("STATE=up");
1068		1155
1069	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1156	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1070	}	1157	}
1071		1158
1072	const char *connection::script_node_down (int)	1159	const char *connection::script_node_down ()
1073	{	1160	{
1074	script_node ();	1161	script_node ();
1075		1162
1076	putenv ("STATE=down");	1163	putenv ("STATE=down");
1077		1164
1078	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1165	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";
1079	}
1080
1081	// send a vpn packet out to other hosts
1082	void
1083	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
1084	{
1085	if (protocol & PROT_IPv4)
1086	vpn->send_ipv4_packet (pkt, si, tos);
1087	else
1088	vpn->send_udpv4_packet (pkt, si, tos);
1089	}	1166	}
1090		1167
1091	connection::connection(struct vpn *vpn_)	1168	connection::connection(struct vpn *vpn_)
1092	: vpn(vpn_)	1169	: vpn(vpn_)
1093	, rekey (this, &connection::rekey_cb)	1170	, rekey (this, &connection::rekey_cb)

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Comparing gvpe/src/connection.C (file contents): Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.13 by pcg, Fri Aug 8 07:52:26 2003 UTC

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Comparing gvpe/src/connection.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.13 by pcg, Fri Aug 8 07:52:26 2003 UTC