[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 1.21 by pcg, Thu Oct 16 02:28:36 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"
		39
		40	#include "netcompat.h"
34		41
35	#if !HAVE_RAND_PSEUDO_BYTES	42	#if !HAVE_RAND_PSEUDO_BYTES
36	# define RAND_pseudo_bytes RAND_bytes	43	# define RAND_pseudo_bytes RAND_bytes
37	#endif	44	#endif
38		45
…		…
80	rsachallenge chg;	87	rsachallenge chg;
81	};	88	};
82		89
83	struct rsa_cache : list<rsa_entry>	90	struct rsa_cache : list<rsa_entry>
84	{	91	{
85	void cleaner_cb (tstamp &ts); time_watcher cleaner;	92	void cleaner_cb (time_watcher &w); time_watcher cleaner;
86		93
87	bool find (const rsaid &id, rsachallenge &chg)	94	bool find (const rsaid &id, rsachallenge &chg)
88	{	95	{
89	for (iterator i = begin (); i != end (); ++i)	96	for (iterator i = begin (); i != end (); ++i)
90	{	97	{
…		…
124	: cleaner (this, &rsa_cache::cleaner_cb)	131	: cleaner (this, &rsa_cache::cleaner_cb)
125	{ }	132	{ }
126		133
127	} rsa_cache;	134	} rsa_cache;
128		135
129	void rsa_cache::cleaner_cb (tstamp &ts)	136	void rsa_cache::cleaner_cb (time_watcher &w)
130	{	137	{
131	if (empty ())	138	if (empty ())
132	ts = TSTAMP_CANCEL;	139	w.at = TSTAMP_CANCEL;
133	else	140	else
134	{	141	{
135	ts = NOW + RSA_TTL;	142	w.at = NOW + RSA_TTL;
136		143
137	for (iterator i = begin (); i != end (); )	144	for (iterator i = begin (); i != end (); )
138	if (i->expire <= NOW)	145	if (i->expire <= NOW)
139	i = erase (i);	146	i = erase (i);
140	else	147	else
…		…
142	}	149	}
143	}	150	}
144		151
145	//////////////////////////////////////////////////////////////////////////////	152	//////////////////////////////////////////////////////////////////////////////
146		153
147	void pkt_queue::put (tap_packet *p)	154	void pkt_queue::put (net_packet *p)
148	{	155	{
149	if (queue[i])	156	if (queue[i])
150	{	157	{
151	delete queue[i];	158	delete queue[i];
152	j = (j + 1) % QUEUEDEPTH;	159	j = (j + 1) % QUEUEDEPTH;
…		…
155	queue[i] = p;	162	queue[i] = p;
156		163
157	i = (i + 1) % QUEUEDEPTH;	164	i = (i + 1) % QUEUEDEPTH;
158	}	165	}
159		166
160	tap_packet *pkt_queue::get ()	167	net_packet *pkt_queue::get ()
161	{	168	{
162	tap_packet *p = queue[j];	169	net_packet *p = queue[j];
163		170
164	if (p)	171	if (p)
165	{	172	{
166	queue[j] = 0;	173	queue[j] = 0;
167	j = (j + 1) % QUEUEDEPTH;	174	j = (j + 1) % QUEUEDEPTH;
…		…
192	// 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.
193	// this implementation ("splay list" ;) is inefficient,	200	// this implementation ("splay list" ;) is inefficient,
194	// but low on resources.	201	// but low on resources.
195	struct net_rate_limiter : list<net_rateinfo>	202	struct net_rate_limiter : list<net_rateinfo>
196	{	203	{
197	static const double ALPHA = 1. - 1. / 90.; // allow bursts	204	static const double ALPHA = 1. - 1. / 600.; // allow bursts
198	static const double CUTOFF = 20.; // one event every CUTOFF seconds	205	static const double CUTOFF = 10.; // one event every CUTOFF seconds
199	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
200		208
201	bool can (const sockinfo &si) { return can((u32)si.host); }	209	bool can (const sockinfo &si) { return can((u32)si.host); }
202	bool can (u32 host);	210	bool can (u32 host);
203	};	211	};
204		212
205	net_rate_limiter auth_rate_limiter, reset_rate_limiter;	213	net_rate_limiter auth_rate_limiter, reset_rate_limiter;
206		214
…		…
220	{	228	{
221	net_rateinfo ri;	229	net_rateinfo ri;
222		230
223	ri.host = host;	231	ri.host = host;
224	ri.pcnt = 1.;	232	ri.pcnt = 1.;
225	ri.diff = CUTOFF * (1. / (1. - ALPHA));	233	ri.diff = MAXDIF;
226	ri.last = NOW;	234	ri.last = NOW;
227		235
228	push_front (ri);	236	push_front (ri);
229		237
230	return true;	238	return true;
…		…
237	ri.pcnt = ri.pcnt * ALPHA;	245	ri.pcnt = ri.pcnt * ALPHA;
238	ri.diff = ri.diff * ALPHA + (NOW - ri.last);	246	ri.diff = ri.diff * ALPHA + (NOW - ri.last);
239		247
240	ri.last = NOW;	248	ri.last = NOW;
241		249
		250	double dif = ri.diff / ri.pcnt;
		251
242	bool send = ri.diff / ri.pcnt > CUTOFF;	252	bool send = dif > CUTOFF;
243		253
		254	if (dif > MAXDIF)
		255	{
		256	ri.pcnt = 1.;
		257	ri.diff = MAXDIF;
		258	}
244	if (send)	259	else if (send)
245	ri.pcnt++;	260	ri.pcnt++;
246		261
247	push_front (ri);	262	push_front (ri);
248		263
249	return send;	264	return send;
…		…
280	hmac_gen (ctx);	295	hmac_gen (ctx);
281		296
282	return !memcmp (hmac, hmac_digest, HMACLENGTH);	297	return !memcmp (hmac, hmac_digest, HMACLENGTH);
283	}	298	}
284		299
285	void vpn_packet::set_hdr (ptype type, unsigned int dst)	300	void vpn_packet::set_hdr (ptype type_, unsigned int dst)
286	{	301	{
287	this->type = type;	302	type = type_;
288		303
289	int src = THISNODE->id;	304	int src = THISNODE->id;
290		305
291	src1 = src;	306	src1 = src;
292	srcdst = ((src >> 8) << 4) \| (dst >> 8);	307	srcdst = ((src >> 8) << 4) \| (dst >> 8);
…		…
462	set_hdr (type, dst);	477	set_hdr (type, dst);
463	}	478	}
464		479
465	bool config_packet::chk_config () const	480	bool config_packet::chk_config () const
466	{	481	{
467	return prot_major == PROTOCOL_MAJOR	482	if (prot_major != PROTOCOL_MAJOR)
468	&& randsize == RAND_SIZE	483	slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR);
469	&& hmaclen == HMACLENGTH	484	else if (randsize != RAND_SIZE)
470	&& 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 ());
471	&& challengelen == sizeof (rsachallenge)	490	else if (challengelen != sizeof (rsachallenge))
		491	slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge));
472	&& 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));
473	&& 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));
474	&& 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;
475	}	502	}
476		503
477	struct auth_req_packet : config_packet	504	struct auth_req_packet : config_packet
478	{	505	{
479	char magic[8];	506	char magic[8];
…		…
541	};	568	};
542		569
543	/////////////////////////////////////////////////////////////////////////////	570	/////////////////////////////////////////////////////////////////////////////
544		571
545	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
546	connection::reset_dstaddr ()	608	connection::reset_si ()
547	{	609	{
		610	protocol = best_protocol (THISNODE->protocols & conf->protocols);
		611
		612	// mask out protocols we cannot establish
		613	if (!conf->udp_port) protocol &= ~PROT_UDPv4;
		614	if (!conf->tcp_port) protocol &= ~PROT_TCPv4;
		615
548	si.set (conf);	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);
		636	}
		637
		638	return si;
		639	}
		640
		641	void
		642	connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
		643	{
		644	if (!vpn->send_vpn_packet (pkt, si, tos))
		645	reset_connection ();
549	}	646	}
550		647
551	void	648	void
552	connection::send_ping (const sockinfo &si, u8 pong)	649	connection::send_ping (const sockinfo &si, u8 pong)
553	{	650	{
…		…
575		672
576	void	673	void
577	connection::send_auth_request (const sockinfo &si, bool initiate)	674	connection::send_auth_request (const sockinfo &si, bool initiate)
578	{	675	{
579	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);	676	auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols);
580
581	protocol = best_protocol (THISNODE->protocols & conf->protocols);
582		677
583	rsachallenge chg;	678	rsachallenge chg;
584		679
585	rsa_cache.gen (pkt->id, chg);	680	rsa_cache.gen (pkt->id, chg);
586		681
…		…
589	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))	684	conf->rsa_key, RSA_PKCS1_OAEP_PADDING))
590	fatal ("RSA_public_encrypt error");	685	fatal ("RSA_public_encrypt error");
591		686
592	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);	687	slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si);
593		688
594	send_vpn_packet (pkt, si, IPTOS_RELIABILITY); // rsa is very very costly	689	send_vpn_packet (pkt, si, IPTOS_RELIABILITY \| IPTOS_LOWDELAY); // rsa is very very costly
595		690
596	delete pkt;	691	delete pkt;
597	}	692	}
598		693
599	void	694	void
…		…
627		722
628	delete r;	723	delete r;
629	}	724	}
630		725
631	void	726	void
632	connection::establish_connection_cb (tstamp &ts)	727	connection::establish_connection_cb (time_watcher &w)
633	{	728	{
634	if (ictx \|\| conf == THISNODE	729	if (ictx \|\| conf == THISNODE
635	\|\| connectmode == conf_node::C_NEVER	730	\|\| connectmode == conf_node::C_NEVER
636	\|\| connectmode == conf_node::C_DISABLED)	731	\|\| connectmode == conf_node::C_DISABLED)
637	ts = TSTAMP_CANCEL;	732	w.at = TSTAMP_CANCEL;
638	else if (ts <= NOW)	733	else if (w.at <= NOW)
639	{	734	{
640	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;
641		736
642	if (retry_int < 3600 * 8)	737	if (retry_int < 3600 * 8)
643	retry_cnt++;	738	retry_cnt++;
644		739
645	ts = NOW + retry_int;	740	w.at = NOW + retry_int;
646		741
647	if (conf->hostname)	742	reset_si ();
		743
		744	if (si.prot && !si.host)
		745	vpn->send_connect_request (conf->id);
		746	else
648	{	747	{
649	reset_dstaddr ();	748	const sockinfo &dsi = forward_si (si);
		749
650	if (si.host && auth_rate_limiter.can (si))	750	if (dsi.valid () && auth_rate_limiter.can (dsi))
651	{	751	{
652	if (retry_cnt < 4)	752	if (retry_cnt < 4)
653	send_auth_request (si, true);	753	send_auth_request (dsi, true);
654	else	754	else
655	send_ping (si, 0);	755	send_ping (dsi, 0);
656	}	756	}
657	}	757	}
658	else
659	vpn->connect_request (conf->id);
660	}	758	}
661	}	759	}
662		760
663	void	761	void
664	connection::reset_connection ()	762	connection::reset_connection ()
…		…
693		791
694	reset_connection ();	792	reset_connection ();
695	}	793	}
696		794
697	void	795	void
698	connection::rekey_cb (tstamp &ts)	796	connection::rekey_cb (time_watcher &w)
699	{	797	{
700	ts = TSTAMP_CANCEL;	798	w.at = TSTAMP_CANCEL;
701		799
702	reset_connection ();	800	reset_connection ();
703	establish_connection ();	801	establish_connection ();
704	}	802	}
705		803
706	void	804	void
707	connection::send_data_packet (tap_packet *pkt, bool broadcast)	805	connection::send_data_packet (tap_packet *pkt)
708	{	806	{
709	vpndata_packet *p = new vpndata_packet;	807	vpndata_packet *p = new vpndata_packet;
710	int tos = 0;	808	int tos = 0;
711		809
712	if (conf->inherit_tos	810	// I am not hilarious about peeking into packets, but so be it.
713	&& (pkt)[12] == 0x08 && (pkt)[13] == 0x00 // IP	811	if (conf->inherit_tos && pkt->is_ipv4 ())
714	&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4
715	tos = (*pkt)[15] & IPTOS_TOS_MASK;	812	tos = (*pkt)[15] & IPTOS_TOS_MASK;
716		813
717	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
718	send_vpn_packet (p, si, tos);	815	send_vpn_packet (p, si, tos);
719		816
720	delete p;	817	delete p;
721		818
722	if (oseqno > MAX_SEQNO)	819	if (oseqno > MAX_SEQNO)
723	rekey ();	820	rekey ();
724	}	821	}
725		822
726	void	823	void
727	connection::inject_data_packet (tap_packet *pkt, bool broadcast)	824	connection::inject_data_packet (tap_packet pkt, bool broadcast/TODO DDD*/)
728	{	825	{
729	if (ictx && octx)	826	if (ictx && octx)
730	send_data_packet (pkt, broadcast);	827	send_data_packet (pkt);
731	else	828	else
732	{	829	{
733	if (!broadcast)//DDDD	830	if (!broadcast)//DDDD
734	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));
735		844
736	establish_connection ();	845	establish_connection ();
737	}	846	}
738	}	847	}
739		848
…		…
745	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",
746	conf->id, pkt->typ (), pkt->src (), pkt->dst ());	855	conf->id, pkt->typ (), pkt->src (), pkt->dst ());
747		856
748	switch (pkt->typ ())	857	switch (pkt->typ ())
749	{	858	{
750	case vpn_packet::PT_PING:	859	case vpn_packet::PT_PING:
751	// we send pings instead of auth packets after some retries,	860	// we send pings instead of auth packets after some retries,
752	// so reset the retry counter and establish a connection	861	// so reset the retry counter and establish a connection
753	// when we receive a ping.	862	// when we receive a ping.
754	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:
755	{	877	{
756	if (auth_rate_limiter.can (rsi))	878	reset_connection ();
757	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 ();
758	}	890	}
759	else
760	send_ping (rsi, 1); // pong
761
762	break;	891	break;
763		892
764	case vpn_packet::PT_PONG:
765	break;
766
767	case vpn_packet::PT_RESET:	893	case vpn_packet::PT_AUTH_REQ:
768	{	894	if (auth_rate_limiter.can (rsi))
769	reset_connection ();
770
771	config_packet p = (config_packet ) pkt;
772
773	if (!p->chk_config ())
774	{	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
775	slog (L_WARN, _("%s(%s): protocol mismatch, disabling node"),	934	slog (L_WARN, _("%s(%s): protocol mismatch"),
776	conf->nodename, (const char *)rsi);	935	conf->nodename, (const char *)rsi);
777	connectmode = conf_node::C_DISABLED;	936
		937	send_reset (rsi);
778	}	938	}
779	else if (connectmode == conf_node::C_ALWAYS)	939
780	establish_connection ();
781	}
782	break;	940	break;
783		941
784	case vpn_packet::PT_AUTH_REQ:	942	case vpn_packet::PT_AUTH_RES:
785	if (auth_rate_limiter.can (rsi))
786	{	943	{
787	auth_req_packet p = (auth_req_packet ) pkt;	944	auth_res_packet p = (auth_res_packet ) pkt;
788		945
789	slog (L_TRACE, "<<%d PT_AUTH_REQ(%d)", conf->id, p->initiate);	946	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);
790		947
791	if (p->chk_config () && !strncmp (p->magic, MAGIC, 8))	948	if (p->chk_config ())
792	{	949	{
793	if (p->prot_minor != PROTOCOL_MINOR)	950	if (p->prot_minor != PROTOCOL_MINOR)
794	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."),
795	conf->nodename, (const char *)rsi,	952	conf->nodename, (const char *)rsi,
796	PROTOCOL_MINOR, conf->nodename, p->prot_minor);	953	PROTOCOL_MINOR, conf->nodename, p->prot_minor);
797		954
798	if (p->initiate)
799	send_auth_request (rsi, false);
800
801	rsachallenge k;	955	rsachallenge chg;
802		956
803	if (0 > RSA_private_decrypt (sizeof (p->encr),	957	if (!rsa_cache.find (p->id, chg))
804	(unsigned char )&p->encr, (unsigned char )&k,	958	{
805	::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))	959	slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
806	slog (L_ERR, _("%s(%s): challenge illegal or corrupted"),
807	conf->nodename, (const char *)rsi);	960	conf->nodename, (const char *)rsi);
		961	break;
		962	}
808	else	963	else
809	{	964	{
810	retry_cnt = 0;	965	crypto_ctx *cctx = new crypto_ctx (chg, 0);
811	establish_connection.set (NOW + 8); //? ;)	966
812	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	}
813	rekey.reset ();	974	else
		975	{
		976	rsaresponse h;
814		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
815	delete ictx;	1007	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	}	1008	}
828	}	1009	}
829
830	send_reset (rsi);
831	}	1010	}
832		1011
		1012	send_reset (rsi);
833	break;	1013	break;
834		1014
835	case vpn_packet::PT_AUTH_RES:	1015	case vpn_packet::PT_DATA_COMPRESSED:
836	{	1016	#if !ENABLE_COMPRESSION
837	auth_res_packet p = (auth_res_packet ) pkt;	1017	send_reset (rsi);
		1018	break;
		1019	#endif
838		1020
839	slog (L_TRACE, "<<%d PT_AUTH_RES", conf->id);	1021	case vpn_packet::PT_DATA_UNCOMPRESSED:
840		1022
841	if (p->chk_config ())	1023	if (ictx && octx)
842	{	1024	{
843	if (p->prot_minor != PROTOCOL_MINOR)	1025	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		1026
848	rsachallenge chg;	1027	if (!p->hmac_chk (ictx))
849		1028	slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n"
850	if (!rsa_cache.find (p->id, chg))	1029	"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);	1030	conf->nodename, (const char *)rsi);
853	else	1031	else
854	{	1032	{
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	1033	u32 seqno;
		1034	tap_packet *d = p->unpack (this, seqno);
		1035
		1036	if (iseqno.recv_ok (seqno))
862	{	1037	{
863	rsaresponse h;	1038	vpn->tap->send (d);
864		1039
865	rsa_hash (p->id, chg, h);	1040	if (si != rsi)
866
867	if (!memcmp ((u8 )&h, (u8 )p->response, sizeof h))
868	{	1041	{
869	prot_minor = p->prot_minor;	1042	// fast re-sync on connection changes, useful especially for tcp/ip
870
871	delete ictx; ictx = cctx;
872
873	iseqno.reset (ntohl ((u32 )&chg[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid
874
875	si = rsi;	1043	si = rsi;
876		1044
877	rekey.set (NOW + ::conf.rekey);	1045	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,	1046	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	}	1047	}
		1048
899	else	1049	delete d;
900	slog (L_ERR, _("%s(%s): sent and received challenge do not match"),	1050
901	conf->nodename, (const char *)rsi);	1051	break;
902	}	1052	}
903
904	delete cctx;
905	}	1053	}
906	}	1054	}
907	}
908		1055
909	send_reset (rsi);	1056	send_reset (rsi);
910	break;	1057	break;
911		1058
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:	1059	case vpn_packet::PT_CONNECT_REQ:
962	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1060	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
963	{	1061	{
964	connect_req_packet p = (connect_req_packet ) pkt;	1062	connect_req_packet p = (connect_req_packet ) pkt;
965		1063
966	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
967	conf->protocols = p->protocols;
968	connection *c = vpn->conns[p->id - 1];	1065	connection *c = vpn->conns[p->id - 1];
		1066	conf->protocols = p->protocols;
969		1067
970	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",	1068	slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n",
971	conf->id, p->id, c->ictx && c->octx);	1069	conf->id, p->id, c->ictx && c->octx);
972		1070
973	if (c->ictx && c->octx)	1071	if (c->ictx && c->octx)
974	{	1072	{
975	// send connect_info packets to both sides, in case one is	1073	// send connect_info packets to both sides, in case one is
976	// behind a nat firewall (or both ;)	1074	// behind a nat firewall (or both ;)
977	c->send_connect_info (conf->id, si, conf->protocols);	1075	c->send_connect_info (conf->id, si, conf->protocols);
978	send_connect_info (c->conf->id, c->si, c->conf->protocols);	1076	send_connect_info (c->conf->id, c->si, c->conf->protocols);
979	}	1077	}
		1078	else
		1079	c->establish_connection ();
980	}	1080	}
981		1081
982	break;	1082	break;
983		1083
984	case vpn_packet::PT_CONNECT_INFO:	1084	case vpn_packet::PT_CONNECT_INFO:
985	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))	1085	if (ictx && octx && rsi == si && pkt->hmac_chk (ictx))
986	{	1086	{
987	connect_info_packet p = (connect_info_packet ) pkt;	1087	connect_info_packet p = (connect_info_packet ) pkt;
988		1088
989	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
990	conf->protocols = p->protocols;	1090
991	connection *c = vpn->conns[p->id - 1];	1091	connection *c = vpn->conns[p->id - 1];
992		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
993	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",	1097	slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)",
994	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);
995		1099
		1100	const sockinfo &dsi = forward_si (p->si);
		1101
		1102	if (dsi.valid ())
996	c->send_auth_request (p->si, true);	1103	c->send_auth_request (dsi, true);
997	}	1104	}
998		1105
999	break;	1106	break;
1000		1107
1001	default:	1108	default:
1002	send_reset (rsi);	1109	send_reset (rsi);
1003	break;	1110	break;
1004
1005	}	1111	}
1006	}	1112	}
1007		1113
1008	void connection::keepalive_cb (tstamp &ts)	1114	void connection::keepalive_cb (time_watcher &w)
1009	{	1115	{
1010	if (NOW >= last_activity + ::conf.keepalive + 30)	1116	if (NOW >= last_activity + ::conf.keepalive + 30)
1011	{	1117	{
1012	reset_connection ();	1118	reset_connection ();
1013	establish_connection ();	1119	establish_connection ();
1014	}	1120	}
1015	else if (NOW < last_activity + ::conf.keepalive)	1121	else if (NOW < last_activity + ::conf.keepalive)
1016	ts = last_activity + ::conf.keepalive;	1122	w.at = last_activity + ::conf.keepalive;
1017	else if (conf->connectmode != conf_node::C_ONDEMAND	1123	else if (conf->connectmode != conf_node::C_ONDEMAND
1018	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)	1124	\|\| THISNODE->connectmode != conf_node::C_ONDEMAND)
1019	{	1125	{
1020	send_ping (si);	1126	send_ping (si);
1021	ts = NOW + 5;	1127	w.at = NOW + 5;
1022	}	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;
1023	else	1133	else
1024	reset_connection ();	1134	reset_connection ();
1025	}	1135	}
1026		1136
1027	void connection::connect_request (int id)	1137	void connection::send_connect_request (int id)
1028	{	1138	{
1029	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);
1030		1140
1031	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);	1141	slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", conf->id, id);
1032	p->hmac_set (octx);	1142	p->hmac_set (octx);
…		…
1035	delete p;	1145	delete p;
1036	}	1146	}
1037		1147
1038	void connection::script_node ()	1148	void connection::script_node ()
1039	{	1149	{
1040	vpn->script_if_up (0);	1150	vpn->script_if_up ();
1041		1151
1042	char *env;	1152	char *env;
1043	asprintf (&env, "DESTID=%d", conf->id); putenv (env);	1153	asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1044	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);	1154	asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1045	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);	1155	asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1046	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);	1156	asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1047	}	1157	}
1048		1158
1049	const char *connection::script_node_up (int)	1159	const char *connection::script_node_up ()
1050	{	1160	{
1051	script_node ();	1161	script_node ();
1052		1162
1053	putenv ("STATE=up");	1163	putenv ("STATE=up");
1054		1164
1055	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";	1165	return ::conf.script_node_up ? ::conf.script_node_up : "node-up";
1056	}	1166	}
1057		1167
1058	const char *connection::script_node_down (int)	1168	const char *connection::script_node_down ()
1059	{	1169	{
1060	script_node ();	1170	script_node ();
1061		1171
1062	putenv ("STATE=down");	1172	putenv ("STATE=down");
1063		1173
1064	return ::conf.script_node_up ? ::conf.script_node_down : "node-down";	1174	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	}	1175	}
1076		1176
1077	connection::connection(struct vpn *vpn_)	1177	connection::connection(struct vpn *vpn_)
1078	: vpn(vpn_)	1178	: vpn(vpn_)
1079	, rekey (this, &connection::rekey_cb)	1179	, 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 1.21 by pcg, Thu Oct 16 02:28:36 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 1.21 by pcg, Thu Oct 16 02:28:36 2003 UTC