[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 1.13 by pcg, Fri Aug 8 07:52:26 2003 UTC

…		…
22	# include "lzf/lzf.h"	22	# include "lzf/lzf.h"
23	}	23	}
24		24
25	#include <list>	25	#include <list>
26		26
		27	#include <openssl/rand.h>
		28	#include <openssl/evp.h>
		29	#include <openssl/rsa.h>
		30	#include <openssl/err.h>
		31
27	#include "gettext.h"	32	#include "gettext.h"
28		33
29	#include "conf.h"	34	#include "conf.h"
30	#include "slog.h"	35	#include "slog.h"
31	#include "device.h"	36	#include "device.h"
32	#include "protocol.h"	37	#include "vpn.h"
33	#include "connection.h"	38	#include "connection.h"
34		39
35	#if !HAVE_RAND_PSEUDO_BYTES	40	#if !HAVE_RAND_PSEUDO_BYTES
36	# define RAND_pseudo_bytes RAND_bytes	41	# define RAND_pseudo_bytes RAND_bytes
37	#endif	42	#endif
…		…
80	rsachallenge chg;	85	rsachallenge chg;
81	};	86	};
82		87
83	struct rsa_cache : list<rsa_entry>	88	struct rsa_cache : list<rsa_entry>
84	{	89	{
85	void cleaner_cb (tstamp &ts); time_watcher cleaner;	90	void cleaner_cb (time_watcher &w); time_watcher cleaner;
86		91
87	bool find (const rsaid &id, rsachallenge &chg)	92	bool find (const rsaid &id, rsachallenge &chg)
88	{	93	{
89	for (iterator i = begin (); i != end (); ++i)	94	for (iterator i = begin (); i != end (); ++i)
90	{	95	{
…		…
124	: cleaner (this, &rsa_cache::cleaner_cb)	129	: cleaner (this, &rsa_cache::cleaner_cb)
125	{ }	130	{ }
126		131
127	} rsa_cache;	132	} rsa_cache;
128		133
129	void rsa_cache::cleaner_cb (tstamp &ts)	134	void rsa_cache::cleaner_cb (time_watcher &w)
130	{	135	{
131	if (empty ())	136	if (empty ())
132	ts = TSTAMP_CANCEL;	137	w.at = TSTAMP_CANCEL;
133	else	138	else
134	{	139	{
135	ts = NOW + RSA_TTL;	140	w.at = NOW + RSA_TTL;
136		141
137	for (iterator i = begin (); i != end (); )	142	for (iterator i = begin (); i != end (); )
138	if (i->expire <= NOW)	143	if (i->expire <= NOW)
139	i = erase (i);	144	i = erase (i);
140	else	145	else
…		…
142	}	147	}
143	}	148	}
144		149
145	//////////////////////////////////////////////////////////////////////////////	150	//////////////////////////////////////////////////////////////////////////////
146		151
147	void pkt_queue::put (tap_packet *p)	152	void pkt_queue::put (net_packet *p)
148	{	153	{
149	if (queue[i])	154	if (queue[i])
150	{	155	{
151	delete queue[i];	156	delete queue[i];
152	j = (j + 1) % QUEUEDEPTH;	157	j = (j + 1) % QUEUEDEPTH;
…		…
155	queue[i] = p;	160	queue[i] = p;
156		161
157	i = (i + 1) % QUEUEDEPTH;	162	i = (i + 1) % QUEUEDEPTH;
158	}	163	}
159		164
160	tap_packet *pkt_queue::get ()	165	net_packet *pkt_queue::get ()
161	{	166	{
162	tap_packet *p = queue[j];	167	net_packet *p = queue[j];
163		168
164	if (p)	169	if (p)
165	{	170	{
166	queue[j] = 0;	171	queue[j] = 0;
167	j = (j + 1) % QUEUEDEPTH;	172	j = (j + 1) % QUEUEDEPTH;
…		…
192	// 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.
193	// this implementation ("splay list" ;) is inefficient,	198	// this implementation ("splay list" ;) is inefficient,
194	// but low on resources.	199	// but low on resources.
195	struct net_rate_limiter : list<net_rateinfo>	200	struct net_rate_limiter : list<net_rateinfo>
196	{	201	{
197	static const double ALPHA = 1. - 1. / 90.; // allow bursts	202	static const double ALPHA = 1. - 1. / 180.; // allow bursts
198	static const double CUTOFF = 20.; // one event every CUTOFF seconds	203	static const double CUTOFF = 10.; // one event every CUTOFF seconds
199	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
200		206
201	bool can (const sockinfo &si) { return can((u32)si.host); }	207	bool can (const sockinfo &si) { return can((u32)si.host); }
202	bool can (u32 host);	208	bool can (u32 host);
203	};	209	};
204		210
…		…
220	{	226	{
221	net_rateinfo ri;	227	net_rateinfo ri;
222		228
223	ri.host = host;	229	ri.host = host;
224	ri.pcnt = 1.;	230	ri.pcnt = 1.;
225	ri.diff = CUTOFF * (1. / (1. - ALPHA));	231	ri.diff = MAXDIF;
226	ri.last = NOW;	232	ri.last = NOW;
227		233
228	push_front (ri);	234	push_front (ri);
229		235
230	return true;	236	return true;
…		…
237	ri.pcnt = ri.pcnt * ALPHA;	243	ri.pcnt = ri.pcnt * ALPHA;
238	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	244	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
239		245
240	ri.last = NOW;	246	ri.last = NOW;
241		247
		248	double dif = ri.diff / ri.pcnt;
		249
242	bool send = ri.diff / ri.pcnt > CUTOFF;	250	bool send = dif > CUTOFF;
243		251
		252	if (dif > MAXDIF)
		253	{
		254	ri.pcnt = 1.;
		255	ri.diff = MAXDIF;
		256	}
244	if (send)	257	else if (send)
245	ri.pcnt++;	258	ri.pcnt++;
246		259
247	push_front (ri);	260	push_front (ri);
248		261
249	return send;	262	return send;
…		…
280	hmac_gen (ctx);	293	hmac_gen (ctx);
281		294
282	return !memcmp (hmac, hmac_digest, HMACLENGTH);	295	return !memcmp (hmac, hmac_digest, HMACLENGTH);
283	}	296	}
284		297
285	void vpn_packet::set_hdr (ptype type, unsigned int dst)	298	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
286	{	299	{
287	this->type = type;	300	type = type_;
288		301
289	int src = THISNODE->id;	302	int src = THISNODE->id;
290		303
291	src1 = src;	304	src1 = src;
292	srcdst = ((src >> 8) << 4) \| (dst >> 8);	305	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
541	};	554	};
542		555
543	/////////////////////////////////////////////////////////////////////////////	556	/////////////////////////////////////////////////////////////////////////////
544		557
545	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
546	connection::reset_dstaddr ()	594	connection::reset_si ()
547	{	595	{
		596	protocol = best_protocol (THISNODE->protocols & conf->protocols);
		597
		598	// mask out protocols we cannot establish
		599	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
		600	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		601
548	si.set (conf);	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);
		622	}
		623
		624	return si;
		625	}
		626
		627	void
		628	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		629	{
		630	if (!vpn->send_vpn_packet (pkt, si, tos))
		631	reset_connection ();
549	}	632	}
550		633
551	void	634	void
552	connection::send_ping (const sockinfo &si, u8 pong)	635	connection::send_ping (const sockinfo &si, u8 pong)
553	{	636	{
…		…
575		658
576	void	659	void
577	connection::send_auth_request (const sockinfo &si, bool initiate)	660	connection::send_auth_request (const sockinfo &si, bool initiate)
578	{	661	{
579	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	662	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580
581	protocol = best_protocol (THISNODE->protocols & conf->protocols);
582		663
583	rsachallenge chg;	664	rsachallenge chg;
584		665
585	rsa_cache.gen (pkt->id, chg);	666	rsa_cache.gen (pkt->id, chg);
586		667
…		…
589	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	670	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590	fatal ("RSA_public_encrypt error");	671	fatal ("RSA_public_encrypt error");
591		672
592	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	673	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
593		674
594	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	675	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
595		676
596	delete pkt;	677	delete pkt;
597	}	678	}
598		679
599	void	680	void
…		…
627		708
628	delete r;	709	delete r;
629	}	710	}
630		711
631	void	712	void
632	connection::establish_connection_cb (tstamp &ts)	713	connection::establish_connection_cb (time_watcher &w)
633	{	714	{
634	if (ictx \|\| conf == THISNODE	715	if (ictx \|\| conf == THISNODE
635	\|\| connectmode == conf_node::C_NEVER	716	\|\| connectmode == conf_node::C_NEVER
636	\|\| connectmode == conf_node::C_DISABLED)	717	\|\| connectmode == conf_node::C_DISABLED)
637	ts = TSTAMP_CANCEL;	718	w.at = TSTAMP_CANCEL;
638	else if (ts <= NOW)	719	else if (w.at <= NOW)
639	{	720	{
640	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;
641		722
642	if (retry_int < 3600 * 8)	723	if (retry_int < 3600 * 8)
643	retry_cnt++;	724	retry_cnt++;
644		725
645	ts = NOW + retry_int;	726	w.at = NOW + retry_int;
646		727
647	if (conf->hostname)	728	reset_si ();
		729
		730	if (si.prot && !si.host)
		731	vpn->send_connect_request (conf->id);
		732	else
648	{	733	{
649	reset_dstaddr ();	734	const sockinfo &dsi = forward_si (si);
		735
650	if (si.host && auth_rate_limiter.can (si))	736	if (dsi.valid () && auth_rate_limiter.can (dsi))
651	{	737	{
652	if (retry_cnt < 4)	738	if (retry_cnt < 4)
653	send_auth_request (si, true);	739	send_auth_request (dsi, true);
654	else	740	else
655	send_ping (si, 0);	741	send_ping (dsi, 0);
656	}	742	}
657	}	743	}
658	else
659	vpn->connect_request (conf->id);
660	}	744	}
661	}	745	}
662		746
663	void	747	void
664	connection::reset_connection ()	748	connection::reset_connection ()
…		…
693		777
694	reset_connection ();	778	reset_connection ();
695	}	779	}
696		780
697	void	781	void
698	connection::rekey_cb (tstamp &ts)	782	connection::rekey_cb (time_watcher &w)
699	{	783	{
700	ts = TSTAMP_CANCEL;	784	w.at = TSTAMP_CANCEL;
701		785
702	reset_connection ();	786	reset_connection ();
703	establish_connection ();	787	establish_connection ();
704	}	788	}
705		789
…		…
707	connection::send_data_packet (tap_packet *pkt, bool broadcast)	791	connection::send_data_packet (tap_packet *pkt, bool broadcast)
708	{	792	{
709	vpndata_packet *p = new vpndata_packet;	793	vpndata_packet *p = new vpndata_packet;
710	int tos = 0;	794	int tos = 0;
711		795
		796	// I am not hilarious about peeking into packets, but so be it.
712	if (conf->inherit_tos	797	if (conf->inherit_tos
713	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	798	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP
714	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4	799	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715	tos = (*pkt)[15] & IPTOS_TOS_MASK;	800	tos = (*pkt)[15] & IPTOS_TOS_MASK;
716		801
…		…
729	if (ictx && octx)	814	if (ictx && octx)
730	send_data_packet (pkt, broadcast);	815	send_data_packet (pkt, broadcast);
731	else	816	else
732	{	817	{
733	if (!broadcast)//DDDD	818	if (!broadcast)//DDDD
734	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));
735		832
736	establish_connection ();	833	establish_connection ();
737	}	834	}
738	}	835	}
739		836
…		…
745	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",
746	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	843	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
747		844
748	switch (pkt->typ ())	845	switch (pkt->typ ())
749	{	846	{
750	case vpn_packet::PT_PING:	847	case vpn_packet::PT_PING:
751	// we send pings instead of auth packets after some retries,	848	// we send pings instead of auth packets after some retries,
752	// so reset the retry counter and establish a connection	849	// so reset the retry counter and establish a connection
753	// when we receive a ping.	850	// when we receive a ping.
754	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:
755	{	865	{
756	if (auth_rate_limiter.can (rsi))	866	reset_connection ();
757	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 ();
758	}	878	}
759	else
760	send_ping (rsi, 1); // pong
761
762	break;	879	break;
763		880
764	case vpn_packet::PT_PONG:
765	break;
766
767	case vpn_packet::PT_RESET:	881	case vpn_packet::PT_AUTH_REQ:
768	{	882	if (auth_rate_limiter.can (rsi))
769	reset_connection ();
770
771	config_packet p = (config_packet ) pkt;
772
773	if (!p->chk_config ())
774	{	883	{
775	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"),
776	conf->nodename, (const char *)rsi);	904	conf->nodename, (const char *)rsi);
777	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);
778	}	923	}
779	else if (connectmode == conf_node::C_ALWAYS)	924
780	establish_connection ();
781	}
782	break;	925	break;
783		926
784	case vpn_packet::PT_AUTH_REQ:	927	case vpn_packet::PT_AUTH_RES:
785	if (auth_rate_limiter.can (rsi))
786	{	928	{
787	auth_req_packet p = (auth_req_packet ) pkt;	929	auth_res_packet p = (auth_res_packet ) pkt;
788		930
789	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	931	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
790		932
791	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	933	if (p->chk_config ())
792	{	934	{
793	if (p->prot_minor != PROTOCOL_MINOR)	935	if (p->prot_minor != PROTOCOL_MINOR)
794	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."),
795	conf->nodename, (const char *)rsi,	937	conf->nodename, (const char *)rsi,
796	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	938	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797		939
798	if (p->initiate)
799	send_auth_request (rsi, false);
800
801	rsachallenge k;	940	rsachallenge chg;
802		941
803	if (0 > RSA_private_decrypt (sizeof (p->encr),	942	if (!rsa_cache.find (p->id, chg))
804	(unsigned char )&p->encr, (unsigned char )&k,	943	{
805	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	944	slog (L_ERR, _("%s(%s): unrequested auth response"),
806	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807	conf->nodename, (const char *)rsi);	945	conf->nodename, (const char *)rsi);
		946	break;
		947	}
808	else	948	else
809	{	949	{
810	retry_cnt = 0;	950	crypto_ctx *cctx = new crypto_ctx (chg, 0);
811	establish_connection.set (NOW + 8); //? ;)	951
812	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);
813	rekey.reset ();	956	else
		957	{
		958	rsaresponse h;
814		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
815	delete ictx;	989	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	}	990	}
828	}	991	}
829
830	send_reset (rsi);
831	}	992	}
832		993
		994	send_reset (rsi);
833	break;	995	break;
834		996
835	case vpn_packet::PT_AUTH_RES:	997	case vpn_packet::PT_DATA_COMPRESSED:
836	{	998	#if !ENABLE_COMPRESSION
837	auth_res_packet p = (auth_res_packet ) pkt;	999	send_reset (rsi);
		1000	break;
		1001	#endif
838		1002
839	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1003	case vpn_packet::PT_DATA_UNCOMPRESSED:
840		1004
841	if (p->chk_config ())	1005	if (ictx && octx)
842	{	1006	{
843	if (p->prot_minor != PROTOCOL_MINOR)	1007	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		1008
848	rsachallenge chg;	1009	if (!p->hmac_chk (ictx))
849		1010	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850	if (!rsa_cache.find (p->id, chg))	1011	"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);	1012	conf->nodename, (const char *)rsi);
853	else	1013	else
854	{	1014	{
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	1015	u32 seqno;
		1016	tap_packet *d = p->unpack (this, seqno);
		1017
		1018	if (iseqno.recv_ok (seqno))
862	{	1019	{
863	rsaresponse h;	1020	vpn->tap->send (d);
864		1021
865	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;
866		1026
867	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)
868	{	1032	{
869	prot_minor = p->prot_minor;	1033	// fast re-sync on conneciton 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;	1034	si = rsi;
876		1035
877	rekey.set (NOW + ::conf.rekey);	1036	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,	1037	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	}	1038	}
		1039
899	else	1040	delete d;
900	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1041
901	conf->nodename, (const char *)rsi);	1042	break;
902	}	1043	}
903
904	delete cctx;
905	}	1044	}
906	}	1045	}
907	}
908		1046
909	send_reset (rsi);	1047	send_reset (rsi);
910	break;	1048	break;
911		1049
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:	1050	case vpn_packet::PT_CONNECT_REQ:
962	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1051	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963	{	1052	{
964	connect_req_packet p = (connect_req_packet ) pkt;	1053	connect_req_packet p = (connect_req_packet ) pkt;
965		1054
966	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
967	conf->protocols = p->protocols;
968	connection *c = vpn->conns[p->id - 1];	1056	connection *c = vpn->conns[p->id - 1];
		1057	conf->protocols = p->protocols;
969		1058
970	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1059	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
971	conf->id, p->id, c->ictx && c->octx);	1060	conf->id, p->id, c->ictx && c->octx);
972		1061
973	if (c->ictx && c->octx)	1062	if (c->ictx && c->octx)
974	{	1063	{
975	// send connect_info packets to both sides, in case one is	1064	// send connect_info packets to both sides, in case one is
976	// behind a nat firewall (or both ;)	1065	// behind a nat firewall (or both ;)
977	c->send_connect_info (conf->id, si, conf->protocols);	1066	c->send_connect_info (conf->id, si, conf->protocols);
978	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1067	send_connect_info (c->conf->id, c->si, c->conf->protocols);
979	}	1068	}
		1069	else
		1070	c->establish_connection ();
980	}	1071	}
981		1072
982	break;	1073	break;
983		1074
984	case vpn_packet::PT_CONNECT_INFO:	1075	case vpn_packet::PT_CONNECT_INFO:
985	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1076	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986	{	1077	{
987	connect_info_packet p = (connect_info_packet ) pkt;	1078	connect_info_packet p = (connect_info_packet ) pkt;
988		1079
989	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
990	conf->protocols = p->protocols;	1081
991	connection *c = vpn->conns[p->id - 1];	1082	connection *c = vpn->conns[p->id - 1];
992		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
993	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1088	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
994	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);
995		1090
		1091	const sockinfo &dsi = forward_si (p->si);
		1092
		1093	if (dsi.valid ())
996	c->send_auth_request (p->si, true);	1094	c->send_auth_request (dsi, true);
997	}	1095	}
998		1096
999	break;	1097	break;
1000		1098
1001	default:	1099	default:
1002	send_reset (rsi);	1100	send_reset (rsi);
1003	break;	1101	break;
1004
1005	}	1102	}
1006	}	1103	}
1007		1104
1008	void connection::keepalive_cb (tstamp &ts)	1105	void connection::keepalive_cb (time_watcher &w)
1009	{	1106	{
1010	if (NOW >= last_activity + ::conf.keepalive + 30)	1107	if (NOW >= last_activity + ::conf.keepalive + 30)
1011	{	1108	{
1012	reset_connection ();	1109	reset_connection ();
1013	establish_connection ();	1110	establish_connection ();
1014	}	1111	}
1015	else if (NOW < last_activity + ::conf.keepalive)	1112	else if (NOW < last_activity + ::conf.keepalive)
1016	ts = last_activity + ::conf.keepalive;	1113	w.at = last_activity + ::conf.keepalive;
1017	else if (conf->connectmode != conf_node::C_ONDEMAND	1114	else if (conf->connectmode != conf_node::C_ONDEMAND
1018	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1115	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1019	{	1116	{
1020	send_ping (si);	1117	send_ping (si);
1021	ts = NOW + 5;	1118	w.at = NOW + 5;
1022	}	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;
1023	else	1124	else
1024	reset_connection ();	1125	reset_connection ();
1025	}	1126	}
1026		1127
1027	void connection::connect_request (int id)	1128	void connection::send_connect_request (int id)
1028	{	1129	{
1029	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);
1030		1131
1031	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1132	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1032	p->hmac_set (octx);	1133	p->hmac_set (octx);
…		…
1035	delete p;	1136	delete p;
1036	}	1137	}
1037		1138
1038	void connection::script_node ()	1139	void connection::script_node ()
1039	{	1140	{
1040	vpn->script_if_up (0);	1141	vpn->script_if_up ();
1041		1142
1042	char *env;	1143	char *env;
1043	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1144	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1044	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1145	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1146	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1147	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047	}	1148	}
1048		1149
1049	const char *connection::script_node_up (int)	1150	const char *connection::script_node_up ()
1050	{	1151	{
1051	script_node ();	1152	script_node ();
1052		1153
1053	putenv ("STATE=up");	1154	putenv ("STATE=up");
1054		1155
1055	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1156	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1056	}	1157	}
1057		1158
1058	const char *connection::script_node_down (int)	1159	const char *connection::script_node_down ()
1059	{	1160	{
1060	script_node ();	1161	script_node ();
1061		1162
1062	putenv ("STATE=down");	1163	putenv ("STATE=down");
1063		1164
1064	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1165	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	}	1166	}
1076		1167
1077	connection::connection(struct vpn *vpn_)	1168	connection::connection(struct vpn *vpn_)
1078	: vpn(vpn_)	1169	: vpn(vpn_)
1079	, rekey (this, &connection::rekey_cb)	1170	, 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 1.13 by pcg, Fri Aug 8 07:52:26 2003 UTC

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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 1.13 by pcg, Fri Aug 8 07:52:26 2003 UTC