[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 1.21 by pcg, Thu Oct 16 02:28:36 2003 UTC

…		…
35	#include "slog.h"	35	#include "slog.h"
36	#include "device.h"	36	#include "device.h"
37	#include "vpn.h"	37	#include "vpn.h"
38	#include "connection.h"	38	#include "connection.h"
39		39
		40	#include "netcompat.h"
		41
40	#if !HAVE_RAND_PSEUDO_BYTES	42	#if !HAVE_RAND_PSEUDO_BYTES
41	# define RAND_pseudo_bytes RAND_bytes	43	# define RAND_pseudo_bytes RAND_bytes
42	#endif	44	#endif
43		45
44	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic	46	#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
…		…
85	rsachallenge chg;	87	rsachallenge chg;
86	};	88	};
87		89
88	struct rsa_cache : list<rsa_entry>	90	struct rsa_cache : list<rsa_entry>
89	{	91	{
90	void cleaner_cb (tstamp &ts); time_watcher cleaner;	92	void cleaner_cb (time_watcher &w); time_watcher cleaner;
91		93
92	bool find (const rsaid &id, rsachallenge &chg)	94	bool find (const rsaid &id, rsachallenge &chg)
93	{	95	{
94	for (iterator i = begin (); i != end (); ++i)	96	for (iterator i = begin (); i != end (); ++i)
95	{	97	{
…		…
129	: cleaner (this, &rsa_cache::cleaner_cb)	131	: cleaner (this, &rsa_cache::cleaner_cb)
130	{ }	132	{ }
131		133
132	} rsa_cache;	134	} rsa_cache;
133		135
134	void rsa_cache::cleaner_cb (tstamp &ts)	136	void rsa_cache::cleaner_cb (time_watcher &w)
135	{	137	{
136	if (empty ())	138	if (empty ())
137	ts = TSTAMP_CANCEL;	139	w.at = TSTAMP_CANCEL;
138	else	140	else
139	{	141	{
140	ts = NOW + RSA_TTL;	142	w.at = NOW + RSA_TTL;
141		143
142	for (iterator i = begin (); i != end (); )	144	for (iterator i = begin (); i != end (); )
143	if (i->expire <= NOW)	145	if (i->expire <= NOW)
144	i = erase (i);	146	i = erase (i);
145	else	147	else
…		…
147	}	149	}
148	}	150	}
149		151
150	//////////////////////////////////////////////////////////////////////////////	152	//////////////////////////////////////////////////////////////////////////////
151		153
152	void pkt_queue::put (tap_packet *p)	154	void pkt_queue::put (net_packet *p)
153	{	155	{
154	if (queue[i])	156	if (queue[i])
155	{	157	{
156	delete queue[i];	158	delete queue[i];
157	j = (j + 1) % QUEUEDEPTH;	159	j = (j + 1) % QUEUEDEPTH;
…		…
160	queue[i] = p;	162	queue[i] = p;
161		163
162	i = (i + 1) % QUEUEDEPTH;	164	i = (i + 1) % QUEUEDEPTH;
163	}	165	}
164		166
165	tap_packet *pkt_queue::get ()	167	net_packet *pkt_queue::get ()
166	{	168	{
167	tap_packet *p = queue[j];	169	net_packet *p = queue[j];
168		170
169	if (p)	171	if (p)
170	{	172	{
171	queue[j] = 0;	173	queue[j] = 0;
172	j = (j + 1) % QUEUEDEPTH;	174	j = (j + 1) % QUEUEDEPTH;
…		…
197	// only do action once every x seconds per host whole allowing bursts.	199	// only do action once every x seconds per host whole allowing bursts.
198	// this implementation ("splay list" ;) is inefficient,	200	// this implementation ("splay list" ;) is inefficient,
199	// but low on resources.	201	// but low on resources.
200	struct net_rate_limiter : list<net_rateinfo>	202	struct net_rate_limiter : list<net_rateinfo>
201	{	203	{
202	static const double ALPHA = 1. - 1. / 90.; // allow bursts	204	static const double ALPHA = 1. - 1. / 600.; // allow bursts
203	static const double CUTOFF = 20.; // one event every CUTOFF seconds	205	static const double CUTOFF = 10.; // one event every CUTOFF seconds
204	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time	206	static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
		207	static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value
205		208
206	bool can (const sockinfo &si) { return can((u32)si.host); }	209	bool can (const sockinfo &si) { return can((u32)si.host); }
207	bool can (u32 host);	210	bool can (u32 host);
208	};	211	};
209		212
210	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	213	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
211		214
…		…
225	{	228	{
226	net_rateinfo ri;	229	net_rateinfo ri;
227		230
228	ri.host = host;	231	ri.host = host;
229	ri.pcnt = 1.;	232	ri.pcnt = 1.;
230	ri.diff = CUTOFF * (1. / (1. - ALPHA));	233	ri.diff = MAXDIF;
231	ri.last = NOW;	234	ri.last = NOW;
232		235
233	push_front (ri);	236	push_front (ri);
234		237
235	return true;	238	return true;
…		…
242	ri.pcnt = ri.pcnt * ALPHA;	245	ri.pcnt = ri.pcnt * ALPHA;
243	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	246	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
244		247
245	ri.last = NOW;	248	ri.last = NOW;
246		249
		250	double dif = ri.diff / ri.pcnt;
		251
247	bool send = ri.diff / ri.pcnt > CUTOFF;	252	bool send = dif > CUTOFF;
248		253
		254	if (dif > MAXDIF)
		255	{
		256	ri.pcnt = 1.;
		257	ri.diff = MAXDIF;
		258	}
249	if (send)	259	else if (send)
250	ri.pcnt++;	260	ri.pcnt++;
251		261
252	push_front (ri);	262	push_front (ri);
253		263
254	return send;	264	return send;
…		…
285	hmac_gen (ctx);	295	hmac_gen (ctx);
286		296
287	return !memcmp (hmac, hmac_digest, HMACLENGTH);	297	return !memcmp (hmac, hmac_digest, HMACLENGTH);
288	}	298	}
289		299
290	void vpn_packet::set_hdr (ptype type, unsigned int dst)	300	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
291	{	301	{
292	this->type = type;	302	type = type_;
293		303
294	int src = THISNODE->id;	304	int src = THISNODE->id;
295		305
296	src1 = src;	306	src1 = src;
297	srcdst = ((src >> 8) << 4) \| (dst >> 8);	307	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
467	set_hdr (type, dst);	477	set_hdr (type, dst);
468	}	478	}
469		479
470	bool config_packet::chk_config () const	480	bool config_packet::chk_config () const
471	{	481	{
472	return prot_major == PROTOCOL_MAJOR	482	if (prot_major != PROTOCOL_MAJOR)
473	&& randsize == RAND_SIZE	483	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);
474	&& hmaclen == HMACLENGTH	484	else if (randsize != RAND_SIZE)
475	&& flags == curflags ()	485	slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE);
		486	else if (hmaclen != HMACLENGTH)
		487	slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH);
		488	else if (flags != curflags ())
		489	slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ());
476	&& challengelen == sizeof (rsachallenge)	490	else if (challengelen != sizeof (rsachallenge))
		491	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
477	&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER))	492	else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
		493	slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
478	&& digest_nid == htonl (EVP_MD_type (RSA_HASH))	494	else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
		495	slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
479	&& hmac_nid == htonl (EVP_MD_type (DIGEST));	496	else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
		497	slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
		498	else
		499	return true;
		500
		501	return false;
480	}	502	}
481		503
482	struct auth_req_packet : config_packet	504	struct auth_req_packet : config_packet
483	{	505	{
484	char magic[8];	506	char magic[8];
…		…
546	};	568	};
547		569
548	/////////////////////////////////////////////////////////////////////////////	570	/////////////////////////////////////////////////////////////////////////////
549		571
550	void	572	void
		573	connection::connection_established ()
		574	{
		575	if (ictx && octx)
		576	{
		577	connectmode = conf->connectmode;
		578
		579	rekey.start (NOW + ::conf.rekey);
		580	keepalive.start (NOW + ::conf.keepalive);
		581
		582	// send queued packets
		583	if (ictx && octx)
		584	{
		585	while (tap_packet p = (tap_packet )data_queue.get ())
		586	{
		587	send_data_packet (p);
		588	delete p;
		589	}
		590
		591	while (vpn_packet p = (vpn_packet )vpn_queue.get ())
		592	{
		593	send_vpn_packet (p, si, IPTOS_RELIABILITY);
		594	delete p;
		595	}
		596	}
		597	}
		598	else
		599	{
		600	retry_cnt = 0;
		601	establish_connection.start (NOW + 5);
		602	keepalive.reset ();
		603	rekey.reset ();
		604	}
		605	}
		606
		607	void
551	connection::reset_dstaddr ()	608	connection::reset_si ()
552	{	609	{
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);	610	protocol = best_protocol (THISNODE->protocols & conf->protocols);
587		611
588	// mask out protocols we cannot establish	612	// mask out protocols we cannot establish
589	if (!conf->udp_port) protocol &= ~PROT_UDPv4;	613	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
590	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;	614	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
591		615
592	if (protocol)	616	si.set (conf, protocol);
		617	}
		618
		619	// ensure sockinfo is valid, forward if necessary
		620	const sockinfo &
		621	connection::forward_si (const sockinfo &si) const
		622	{
		623	if (!si.valid ())
		624	{
		625	connection *r = vpn->find_router ();
		626
		627	if (r)
		628	{
		629	slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"),
		630	conf->nodename, r->conf->nodename);
		631	return r->si;
		632	}
		633	else
		634	slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
		635	conf->nodename);
593	{	636	}
594	rsachallenge chg;
595		637
596	rsa_cache.gen (pkt->id, chg);	638	return si;
		639	}
597		640
598	if (0 > RSA_public_encrypt (sizeof chg,	641	void
599	(unsigned char )&chg, (unsigned char )&pkt->encr,	642	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
600	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	643	{
601	fatal ("RSA_public_encrypt error");	644	if (!vpn->send_vpn_packet (pkt, si, tos))
		645	reset_connection ();
		646	}
602		647
603	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	648	void
		649	connection::send_ping (const sockinfo &si, u8 pong)
		650	{
		651	ping_packet *pkt = new ping_packet;
604		652
605	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	653	pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING);
		654	send_vpn_packet (pkt, si, IPTOS_LOWDELAY);
		655
		656	delete pkt;
		657	}
		658
		659	void
		660	connection::send_reset (const sockinfo &si)
		661	{
		662	if (reset_rate_limiter.can (si) && connectmode != conf_node::C_DISABLED)
		663	{
		664	config_packet *pkt = new config_packet;
		665
		666	pkt->setup (vpn_packet::PT_RESET, conf->id);
		667	send_vpn_packet (pkt, si, IPTOS_MINCOST);
606		668
607	delete pkt;	669	delete pkt;
608	}	670	}
609	else	671	}
610	; // silently fail	672
		673	void
		674	connection::send_auth_request (const sockinfo &si, bool initiate)
		675	{
		676	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
		677
		678	rsachallenge chg;
		679
		680	rsa_cache.gen (pkt->id, chg);
		681
		682	if (0 > RSA_public_encrypt (sizeof chg,
		683	(unsigned char )&chg, (unsigned char )&pkt->encr,
		684	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
		685	fatal ("RSA_public_encrypt error");
		686
		687	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
		688
		689	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
		690
		691	delete pkt;
611	}	692	}
612		693
613	void	694	void
614	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)	695	connection::send_auth_response (const sockinfo &si, const rsaid &id, const rsachallenge &chg)
615	{	696	{
…		…
641		722
642	delete r;	723	delete r;
643	}	724	}
644		725
645	void	726	void
646	connection::establish_connection_cb (tstamp &ts)	727	connection::establish_connection_cb (time_watcher &w)
647	{	728	{
648	if (ictx \|\| conf == THISNODE	729	if (ictx \|\| conf == THISNODE
649	\|\| connectmode == conf_node::C_NEVER	730	\|\| connectmode == conf_node::C_NEVER
650	\|\| connectmode == conf_node::C_DISABLED)	731	\|\| connectmode == conf_node::C_DISABLED)
651	ts = TSTAMP_CANCEL;	732	w.at = TSTAMP_CANCEL;
652	else if (ts <= NOW)	733	else if (w.at <= NOW)
653	{	734	{
654	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;	735	double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6;
655		736
656	if (retry_int < 3600 * 8)	737	if (retry_int < 3600 * 8)
657	retry_cnt++;	738	retry_cnt++;
658		739
659	ts = NOW + retry_int;	740	w.at = NOW + retry_int;
660		741
661	if (conf->hostname)	742	reset_si ();
		743
		744	if (si.prot && !si.host)
		745	vpn->send_connect_request (conf->id);
		746	else
662	{	747	{
663	reset_dstaddr ();	748	const sockinfo &dsi = forward_si (si);
		749
664	if (si.host && auth_rate_limiter.can (si))	750	if (dsi.valid () && auth_rate_limiter.can (dsi))
665	{	751	{
666	if (retry_cnt < 4)	752	if (retry_cnt < 4)
667	send_auth_request (si, true);	753	send_auth_request (dsi, true);
668	else	754	else
669	send_ping (si, 0);	755	send_ping (dsi, 0);
670	}	756	}
671	}	757	}
672	else
673	vpn->connect_request (conf->id);
674	}	758	}
675	}	759	}
676		760
677	void	761	void
678	connection::reset_connection ()	762	connection::reset_connection ()
…		…
707		791
708	reset_connection ();	792	reset_connection ();
709	}	793	}
710		794
711	void	795	void
712	connection::rekey_cb (tstamp &ts)	796	connection::rekey_cb (time_watcher &w)
713	{	797	{
714	ts = TSTAMP_CANCEL;	798	w.at = TSTAMP_CANCEL;
715		799
716	reset_connection ();	800	reset_connection ();
717	establish_connection ();	801	establish_connection ();
718	}	802	}
719		803
720	void	804	void
721	connection::send_data_packet (tap_packet *pkt, bool broadcast)	805	connection::send_data_packet (tap_packet *pkt)
722	{	806	{
723	vpndata_packet *p = new vpndata_packet;	807	vpndata_packet *p = new vpndata_packet;
724	int tos = 0;	808	int tos = 0;
725		809
726	if (conf->inherit_tos	810	// I am not hilarious about peeking into packets, but so be it.
727	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	811	if (conf->inherit_tos && pkt->is_ipv4 ())
728	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
729	tos = (*pkt)[15] & IPTOS_TOS_MASK;	812	tos = (*pkt)[15] & IPTOS_TOS_MASK;
730		813
731	p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs	814	p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
732	send_vpn_packet (p, si, tos);	815	send_vpn_packet (p, si, tos);
733		816
734	delete p;	817	delete p;
735		818
736	if (oseqno > MAX_SEQNO)	819	if (oseqno > MAX_SEQNO)
737	rekey ();	820	rekey ();
738	}	821	}
739		822
740	void	823	void
741	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	824	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
742	{	825	{
743	if (ictx && octx)	826	if (ictx && octx)
744	send_data_packet (pkt, broadcast);	827	send_data_packet (pkt);
745	else	828	else
746	{	829	{
747	if (!broadcast)//DDDD	830	if (!broadcast)//DDDD
748	queue.put (new tap_packet (*pkt));	831	data_queue.put (new tap_packet (*pkt));
		832
		833	establish_connection ();
		834	}
		835	}
		836
		837	void connection::inject_vpn_packet (vpn_packet *pkt, int tos)
		838	{
		839	if (ictx && octx)
		840	send_vpn_packet (pkt, si, tos);
		841	else
		842	{
		843	vpn_queue.put (new vpn_packet (*pkt));
749		844
750	establish_connection ();	845	establish_connection ();
751	}	846	}
752	}	847	}
753		848
…		…
759	slog (L_NOISE, "<<%d received packet type %d from %d to %d",	854	slog (L_NOISE, "<<%d received packet type %d from %d to %d",
760	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
761		856
762	switch (pkt->typ ())	857	switch (pkt->typ ())
763	{	858	{
764	case vpn_packet::PT_PING:	859	case vpn_packet::PT_PING:
765	// we send pings instead of auth packets after some retries,	860	// we send pings instead of auth packets after some retries,
766	// so reset the retry counter and establish a connection	861	// so reset the retry counter and establish a connection
767	// when we receive a ping.	862	// when we receive a ping.
768	if (!ictx)	863	if (!ictx)
		864	{
		865	if (auth_rate_limiter.can (rsi))
		866	send_auth_request (rsi, true);
		867	}
		868	else
		869	send_ping (rsi, 1); // pong
		870
		871	break;
		872
		873	case vpn_packet::PT_PONG:
		874	break;
		875
		876	case vpn_packet::PT_RESET:
769	{	877	{
770	if (auth_rate_limiter.can (rsi))	878	reset_connection ();
771	send_auth_request (rsi, true);	879
		880	config_packet p = (config_packet ) pkt;
		881
		882	if (!p->chk_config ())
		883	{
		884	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),
		885	conf->nodename, (const char *)rsi);
		886	connectmode = conf_node::C_DISABLED;
		887	}
		888	else if (connectmode == conf_node::C_ALWAYS)
		889	establish_connection ();
772	}	890	}
773	else
774	send_ping (rsi, 1); // pong
775
776	break;	891	break;
777		892
778	case vpn_packet::PT_PONG:
779	break;
780
781	case vpn_packet::PT_RESET:	893	case vpn_packet::PT_AUTH_REQ:
782	{	894	if (auth_rate_limiter.can (rsi))
783	reset_connection ();
784
785	config_packet p = (config_packet ) pkt;
786
787	if (!p->chk_config ())
788	{	895	{
		896	auth_req_packet p = (auth_req_packet ) pkt;
		897
		898	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);
		899
		900	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))
		901	{
		902	if (p->prot_minor != PROTOCOL_MINOR)
		903	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
		904	conf->nodename, (const char *)rsi,
		905	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
		906
		907	if (p->initiate)
		908	send_auth_request (rsi, false);
		909
		910	rsachallenge k;
		911
		912	if (0 > RSA_private_decrypt (sizeof (p->encr),
		913	(unsigned char )&p->encr, (unsigned char )&k,
		914	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
		915	slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
		916	conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
		917	else
		918	{
		919	delete octx;
		920
		921	octx = new crypto_ctx (k, 1);
		922	oseqno = ntohl ((u32 )&k[CHG_SEQNO]) & 0x7fffffff;
		923
		924	conf->protocols = p->protocols;
		925
		926	send_auth_response (rsi, p->id, k);
		927
		928	connection_established ();
		929
		930	break;
		931	}
		932	}
		933	else
789	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	934	slog (L_WARN, _("%s(%s): protocol mismatch"),
790	conf->nodename, (const char *)rsi);	935	conf->nodename, (const char *)rsi);
791	connectmode = conf_node::C_DISABLED;	936
		937	send_reset (rsi);
792	}	938	}
793	else if (connectmode == conf_node::C_ALWAYS)	939
794	establish_connection ();
795	}
796	break;	940	break;
797		941
798	case vpn_packet::PT_AUTH_REQ:	942	case vpn_packet::PT_AUTH_RES:
799	if (auth_rate_limiter.can (rsi))
800	{	943	{
801	auth_req_packet p = (auth_req_packet ) pkt;	944	auth_res_packet p = (auth_res_packet ) pkt;
802		945
803	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
804		947
805	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	948	if (p->chk_config ())
806	{	949	{
807	if (p->prot_minor != PROTOCOL_MINOR)	950	if (p->prot_minor != PROTOCOL_MINOR)
808	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),	951	slog (L_INFO, _("%s(%s): protocol minor version mismatch: ours is %d, %s's is %d."),
809	conf->nodename, (const char *)rsi,	952	conf->nodename, (const char *)rsi,
810	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	953	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
811		954
812	if (p->initiate)
813	send_auth_request (rsi, false);
814
815	rsachallenge k;	955	rsachallenge chg;
816		956
817	if (0 > RSA_private_decrypt (sizeof (p->encr),	957	if (!rsa_cache.find (p->id, chg))
818	(unsigned char )&p->encr, (unsigned char )&k,	958	{
819	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	959	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
820	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
821	conf->nodename, (const char *)rsi);	960	conf->nodename, (const char *)rsi);
		961	break;
		962	}
822	else	963	else
823	{	964	{
824	retry_cnt = 0;	965	crypto_ctx *cctx = new crypto_ctx (chg, 0);
825	establish_connection.set (NOW + 8); //? ;)	966
826	keepalive.reset ();	967	if (!p->hmac_chk (cctx))
		968	{
		969	slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
		970	"could be an attack, or just corruption or an synchronization error"),
		971	conf->nodename, (const char *)rsi);
		972	break;
		973	}
827	rekey.reset ();	974	else
		975	{
		976	rsaresponse h;
828		977
		978	rsa_hash (p->id, chg, h);
		979
		980	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
		981	{
		982	prot_minor = p->prot_minor;
		983
		984	delete ictx; ictx = cctx;
		985
		986	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
		987
		988	si = rsi;
		989	protocol = rsi.prot;
		990
		991	connection_established ();
		992
		993	slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
		994	conf->nodename, (const char *)rsi,
		995	p->prot_major, p->prot_minor);
		996
		997	if (::conf.script_node_up)
		998	run_script (run_script_cb (this, &connection::script_node_up), false);
		999
		1000	break;
		1001	}
		1002	else
		1003	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
		1004	conf->nodename, (const char *)rsi);
		1005	}
		1006
829	delete ictx;	1007	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	}	1008	}
842	}	1009	}
843
844	send_reset (rsi);
845	}	1010	}
846		1011
		1012	send_reset (rsi);
847	break;	1013	break;
848		1014
849	case vpn_packet::PT_AUTH_RES:	1015	case vpn_packet::PT_DATA_COMPRESSED:
850	{	1016	#if !ENABLE_COMPRESSION
851	auth_res_packet p = (auth_res_packet ) pkt;	1017	send_reset (rsi);
		1018	break;
		1019	#endif
852		1020
853	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1021	case vpn_packet::PT_DATA_UNCOMPRESSED:
854		1022
855	if (p->chk_config ())	1023	if (ictx && octx)
856	{	1024	{
857	if (p->prot_minor != PROTOCOL_MINOR)	1025	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		1026
862	rsachallenge chg;	1027	if (!p->hmac_chk (ictx))
863		1028	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
864	if (!rsa_cache.find (p->id, chg))	1029	"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);	1030	conf->nodename, (const char *)rsi);
867	else	1031	else
868	{	1032	{
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	1033	u32 seqno;
		1034	tap_packet *d = p->unpack (this, seqno);
		1035
		1036	if (iseqno.recv_ok (seqno))
876	{	1037	{
877	rsaresponse h;	1038	vpn->tap->send (d);
878		1039
879	rsa_hash (p->id, chg, h);	1040	if (si != rsi)
880
881	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
882	{	1041	{
883	prot_minor = p->prot_minor;	1042	// fast re-sync on connection 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;	1043	si = rsi;
890		1044
891	rekey.set (NOW + ::conf.rekey);	1045	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,	1046	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	}	1047	}
		1048
913	else	1049	delete d;
914	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1050
915	conf->nodename, (const char *)rsi);	1051	break;
916	}	1052	}
917
918	delete cctx;
919	}	1053	}
920	}	1054	}
921	}
922		1055
923	send_reset (rsi);	1056	send_reset (rsi);
924	break;	1057	break;
925		1058
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:	1059	case vpn_packet::PT_CONNECT_REQ:
976	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1060	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
977	{	1061	{
978	connect_req_packet p = (connect_req_packet ) pkt;	1062	connect_req_packet p = (connect_req_packet ) pkt;
979		1063
980	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1064	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];	1065	connection *c = vpn->conns[p->id - 1];
		1066	conf->protocols = p->protocols;
983		1067
984	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1068	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
985	conf->id, p->id, c->ictx && c->octx);	1069	conf->id, p->id, c->ictx && c->octx);
986		1070
987	if (c->ictx && c->octx)	1071	if (c->ictx && c->octx)
988	{	1072	{
989	// send connect_info packets to both sides, in case one is	1073	// send connect_info packets to both sides, in case one is
990	// behind a nat firewall (or both ;)	1074	// behind a nat firewall (or both ;)
991	c->send_connect_info (conf->id, si, conf->protocols);	1075	c->send_connect_info (conf->id, si, conf->protocols);
992	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1076	send_connect_info (c->conf->id, c->si, c->conf->protocols);
993	}	1077	}
		1078	else
		1079	c->establish_connection ();
994	}	1080	}
995		1081
996	break;	1082	break;
997		1083
998	case vpn_packet::PT_CONNECT_INFO:	1084	case vpn_packet::PT_CONNECT_INFO:
999	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1085	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
1000	{	1086	{
1001	connect_info_packet p = (connect_info_packet ) pkt;	1087	connect_info_packet p = (connect_info_packet ) pkt;
1002		1088
1003	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything	1089	assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything
1004	conf->protocols = p->protocols;	1090
1005	connection *c = vpn->conns[p->id - 1];	1091	connection *c = vpn->conns[p->id - 1];
1006		1092
		1093	c->conf->protocols = p->protocols;
		1094	protocol = best_protocol (c->conf->protocols & THISNODE->protocols & p->si.supported_protocols (c->conf));
		1095	p->si.upgrade_protocol (protocol, c->conf);
		1096
1007	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1097	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
1008	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);	1098	conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx);
1009		1099
		1100	const sockinfo &dsi = forward_si (p->si);
		1101
		1102	if (dsi.valid ())
1010	c->send_auth_request (p->si, true);	1103	c->send_auth_request (dsi, true);
1011	}	1104	}
1012		1105
1013	break;	1106	break;
1014		1107
1015	default:	1108	default:
1016	send_reset (rsi);	1109	send_reset (rsi);
1017	break;	1110	break;
1018
1019	}	1111	}
1020	}	1112	}
1021		1113
1022	void connection::keepalive_cb (tstamp &ts)	1114	void connection::keepalive_cb (time_watcher &w)
1023	{	1115	{
1024	if (NOW >= last_activity + ::conf.keepalive + 30)	1116	if (NOW >= last_activity + ::conf.keepalive + 30)
1025	{	1117	{
1026	reset_connection ();	1118	reset_connection ();
1027	establish_connection ();	1119	establish_connection ();
1028	}	1120	}
1029	else if (NOW < last_activity + ::conf.keepalive)	1121	else if (NOW < last_activity + ::conf.keepalive)
1030	ts = last_activity + ::conf.keepalive;	1122	w.at = last_activity + ::conf.keepalive;
1031	else if (conf->connectmode != conf_node::C_ONDEMAND	1123	else if (conf->connectmode != conf_node::C_ONDEMAND
1032	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1124	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1033	{	1125	{
1034	send_ping (si);	1126	send_ping (si);
1035	ts = NOW + 5;	1127	w.at = NOW + 5;
1036	}	1128	}
		1129	else if (NOW < last_activity + ::conf.keepalive + 10)
		1130	// hold ondemand connections implicitly a few seconds longer
		1131	// should delete octx, though, or something like that ;)
		1132	w.at = last_activity + ::conf.keepalive + 10;
1037	else	1133	else
1038	reset_connection ();	1134	reset_connection ();
1039	}	1135	}
1040		1136
1041	void connection::connect_request (int id)	1137	void connection::send_connect_request (int id)
1042	{	1138	{
1043	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);	1139	connect_req_packet *p = new connect_req_packet (conf->id, id, conf->protocols);
1044		1140
1045	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1141	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1046	p->hmac_set (octx);	1142	p->hmac_set (octx);
…		…
1049	delete p;	1145	delete p;
1050	}	1146	}
1051		1147
1052	void connection::script_node ()	1148	void connection::script_node ()
1053	{	1149	{
1054	vpn->script_if_up (0);	1150	vpn->script_if_up ();
1055		1151
1056	char *env;	1152	char *env;
1057	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1153	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1058	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1154	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1059	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1155	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1060	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1156	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1061	}	1157	}
1062		1158
1063	const char *connection::script_node_up (int)	1159	const char *connection::script_node_up ()
1064	{	1160	{
1065	script_node ();	1161	script_node ();
1066		1162
1067	putenv ("STATE=up");	1163	putenv ("STATE=up");
1068		1164
1069	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1165	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1070	}	1166	}
1071		1167
1072	const char *connection::script_node_down (int)	1168	const char *connection::script_node_down ()
1073	{	1169	{
1074	script_node ();	1170	script_node ();
1075		1171
1076	putenv ("STATE=down");	1172	putenv ("STATE=down");
1077		1173
1078	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1174	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	}	1175	}
1090		1176
1091	connection::connection(struct vpn *vpn_)	1177	connection::connection(struct vpn *vpn_)
1092	: vpn(vpn_)	1178	: vpn(vpn_)
1093	, rekey (this, &connection::rekey_cb)	1179	, rekey (this, &connection::rekey_cb)

Diff Legend

-–
+Removed lines
-+
+Added lines
-<
+Changed lines
->
+Changed lines

Comparing gvpe/src/connection.C (file contents): Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs. Revision 1.21 by pcg, Thu Oct 16 02:28:36 2003 UTC

Diff Legend

Comparing gvpe/src/connection.C (file contents):
Revision 1.2 by pcg, Wed Apr 2 03:25:17 2003 UTC vs.
Revision 1.21 by pcg, Thu Oct 16 02:28:36 2003 UTC