ViewVC Help
View File | Revision Log | Show Annotations | Download File
/cvs/gvpe/src/connection.C
(Generate patch)

Comparing gvpe/src/connection.C (file contents):
Revision 1.45 by pcg, Fri Mar 4 09:36:45 2005 UTC vs.
Revision 1.55 by pcg, Tue Apr 26 00:55:56 2005 UTC

… …
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details. 15 GNU General Public License for more details.
16 16
17 You should have received a copy of the GNU General Public License 17 You should have received a copy of the GNU General Public License
18 along with gvpe; if not, write to the Free Software 18 along with gvpe; if not, write to the Free Software
19 Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 19 Foundation, Inc. 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20*/ 20*/
21 21
22#include "config.h" 22#include "config.h"
23 23
24#include <cassert> 24#include <cassert>
… …
27 27
28#include <openssl/rand.h> 28#include <openssl/rand.h>
29#include <openssl/evp.h> 29#include <openssl/evp.h>
30#include <openssl/rsa.h> 30#include <openssl/rsa.h>
31#include <openssl/err.h> 31#include <openssl/err.h>
32
33#include "gettext.h"
34 32
35#include "conf.h" 33#include "conf.h"
36#include "slog.h" 34#include "slog.h"
37#include "device.h" 35#include "device.h"
38#include "vpn.h" 36#include "vpn.h"
… …
97struct rsa_cache : list<rsa_entry> 95struct rsa_cache : list<rsa_entry>
98{ 96{
99 void cleaner_cb (time_watcher &w); time_watcher cleaner; 97 void cleaner_cb (time_watcher &w); time_watcher cleaner;
100 98
101 bool find (const rsaid &id, rsachallenge &chg) 99 bool find (const rsaid &id, rsachallenge &chg)
102 { 100 {
103 for (iterator i = begin (); i != end (); ++i) 101 for (iterator i = begin (); i != end (); ++i)
104 { 102 {
105 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW) 103 if (!memcmp (&id, &i->id, sizeof id) && i->expire > NOW)
106 { 104 {
107 memcpy (&chg, &i->chg, sizeof chg); 105 memcpy (&chg, &i->chg, sizeof chg);
108 106
109 erase (i); 107 erase (i);
110 return true; 108 return true;
111 } 109 }
112 } 110 }
113 111
114 if (cleaner.at < NOW) 112 if (cleaner.at < NOW)
115 cleaner.start (NOW + RSA_TTL); 113 cleaner.start (NOW + RSA_TTL);
116 114
117 return false; 115 return false;
118 } 116 }
119 117
120 void gen (rsaid &id, rsachallenge &chg) 118 void gen (rsaid &id, rsachallenge &chg)
121 { 119 {
122 rsa_entry e; 120 rsa_entry e;
123 121
124 RAND_bytes ((unsigned char *)&id, sizeof id); 122 RAND_bytes ((unsigned char *)&id, sizeof id);
125 RAND_bytes ((unsigned char *)&chg, sizeof chg); 123 RAND_bytes ((unsigned char *)&chg, sizeof chg);
126 124
127 e.expire = NOW + RSA_TTL; 125 e.expire = NOW + RSA_TTL;
128 e.id = id; 126 e.id = id;
129 memcpy (&e.chg, &chg, sizeof chg); 127 memcpy (&e.chg, &chg, sizeof chg);
130 128
131 push_back (e); 129 push_back (e);
132 130
133 if (cleaner.at < NOW) 131 if (cleaner.at < NOW)
134 cleaner.start (NOW + RSA_TTL); 132 cleaner.start (NOW + RSA_TTL);
135 } 133 }
136 134
137 rsa_cache () 135 rsa_cache ()
138 : cleaner (this, &rsa_cache::cleaner_cb) 136 : cleaner (this, &rsa_cache::cleaner_cb)
139 { } 137 { }
140 138
141} rsa_cache; 139} rsa_cache;
142 140
143void rsa_cache::cleaner_cb (time_watcher &w) 141void rsa_cache::cleaner_cb (time_watcher &w)
144{ 142{
… …
478{ 476{
479 prot_major = PROTOCOL_MAJOR; 477 prot_major = PROTOCOL_MAJOR;
480 prot_minor = PROTOCOL_MINOR; 478 prot_minor = PROTOCOL_MINOR;
481 randsize = RAND_SIZE; 479 randsize = RAND_SIZE;
482 hmaclen = HMACLENGTH; 480 hmaclen = HMACLENGTH;
483 flags = ENABLE_COMPRESSION ? 0x81 : 0x80; 481 flags = 0;
484 challengelen = sizeof (rsachallenge); 482 challengelen = sizeof (rsachallenge);
485 features = get_features (); 483 features = get_features ();
486 484
487 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); 485 cipher_nid = htonl (EVP_CIPHER_nid (CIPHER));
488 digest_nid = htonl (EVP_MD_type (RSA_HASH)); 486 digest_nid = htonl (EVP_MD_type (RSA_HASH));
… …
498 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); 496 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
499 else if (randsize != RAND_SIZE) 497 else if (randsize != RAND_SIZE)
500 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); 498 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
501 else if (hmaclen != HMACLENGTH) 499 else if (hmaclen != HMACLENGTH)
502 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); 500 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
503#if 0 // this implementation should handle all flag settings
504 else if (flags != curflags ())
505 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
506#endif
507 else if (challengelen != sizeof (rsachallenge)) 501 else if (challengelen != sizeof (rsachallenge))
508 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); 502 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
509 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 503 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
510 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 504 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
511 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 505 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
… …
644 { 638 {
645 connection *r = vpn->find_router (); 639 connection *r = vpn->find_router ();
646 640
647 if (r) 641 if (r)
648 { 642 {
649 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s"), 643 slog (L_DEBUG, _("%s: no common protocol, trying indirectly through %s (%s)"),
650 conf->nodename, r->conf->nodename); 644 conf->nodename, r->conf->nodename, (const char *)r->si);
651 return r->si; 645 return r->si;
652 } 646 }
653 else 647 else
654 slog (L_DEBUG, _("%s: node unreachable, no common protocol"), 648 slog (L_DEBUG, _("%s: node unreachable, no common protocol"),
655 conf->nodename); 649 conf->nodename);
… …
659} 653}
660 654
661void 655void
662connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos) 656connection::send_vpn_packet (vpn_packet *pkt, const sockinfo &si, int tos)
663{ 657{
664 bool ok; 658 if (!vpn->send_vpn_packet (pkt, si, tos))
665
666 switch (si.prot)
667 {
668 case PROT_IPv4:
669 ok = vpn->send_ipv4_packet (pkt, si, tos); break;
670 case PROT_UDPv4:
671 ok = vpn->send_udpv4_packet (pkt, si, tos); break;
672#if ENABLE_TCP
673 case PROT_TCPv4:
674 ok = vpn->send_tcpv4_packet (pkt, si, tos); break;
675#endif
676#if ENABLE_ICMP
677 case PROT_ICMPv4:
678 ok = vpn->send_icmpv4_packet (pkt, si, tos); break;
679#endif
680#if ENABLE_DNS
681 case PROT_DNSv4:
682 ok = send_dnsv4_packet (pkt, si, tos); break;
683#endif
684
685 default:
686 slog (L_CRIT, _("%s: FATAL: trying to send packet with unsupported protocol"), (const char *)si);
687 ok = false;
688 }
689
690 if (!ok)
691 reset_connection (); 659 reset_connection ();
692} 660}
693 661
694void 662void
695connection::send_ping (const sockinfo &si, u8 pong) 663connection::send_ping (const sockinfo &si, u8 pong)
… …
771 && conf != THISNODE 739 && conf != THISNODE
772 && connectmode != conf_node::C_NEVER 740 && connectmode != conf_node::C_NEVER
773 && connectmode != conf_node::C_DISABLED 741 && connectmode != conf_node::C_DISABLED
774 && NOW > w.at) 742 && NOW > w.at)
775 { 743 {
776 double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; 744 w.at = TSTAMP_MAX; // first disable this watcher in case of recursion
777 745
778 if (retry_int < conf->max_retry) 746 double retry_int = double (retry_cnt & 3
779 retry_cnt++; 747 ? (retry_cnt & 3) + 1
780 else 748 : 1 << (retry_cnt >> 2));
781 retry_int = conf->max_retry;
782
783 w.start (NOW + retry_int);
784 749
785 reset_si (); 750 reset_si ();
751
752 bool slow = si.prot & PROT_SLOW;
786 753
787 if (si.prot && !si.host) 754 if (si.prot && !si.host)
788 vpn->send_connect_request (conf->id); 755 vpn->send_connect_request (conf->id);
789 else 756 else
790 { 757 {
791 const sockinfo &dsi = forward_si (si); 758 const sockinfo &dsi = forward_si (si);
759
760 slow = slow || (dsi.prot & PROT_SLOW);
792 761
793 if (dsi.valid () && auth_rate_limiter.can (dsi)) 762 if (dsi.valid () && auth_rate_limiter.can (dsi))
794 { 763 {
795 if (retry_cnt < 4) 764 if (retry_cnt < 4)
796 send_auth_request (dsi, true); 765 send_auth_request (dsi, true);
797 else 766 else
798 send_ping (dsi, 0); 767 send_ping (dsi, 0);
799 } 768 }
800 } 769 }
770
771 retry_int *= slow ? 8. : 0.7;
772
773 if (retry_int < conf->max_retry)
774 retry_cnt++;
775 else
776 retry_int = conf->max_retry;
777
778 w.start (NOW + retry_int);
801 } 779 }
802} 780}
803 781
804void 782void
805connection::reset_connection () 783connection::reset_connection ()
… …
808 { 786 {
809 slog (L_INFO, _("%s(%s): connection lost"), 787 slog (L_INFO, _("%s(%s): connection lost"),
810 conf->nodename, (const char *)si); 788 conf->nodename, (const char *)si);
811 789
812 if (::conf.script_node_down) 790 if (::conf.script_node_down)
813 run_script (run_script_cb (this, &connection::script_node_down), false); 791 if (!run_script (run_script_cb (this, &connection::script_node_down), false))
792 slog (L_WARN, _("node-down command execution failed, continuing."));
814 } 793 }
815 794
816 delete ictx; ictx = 0; 795 delete ictx; ictx = 0;
817 delete octx; octx = 0; 796 delete octx; octx = 0;
818#if ENABLE_DNS 797#if ENABLE_DNS
… …
964 delete octx; 943 delete octx;
965 944
966 octx = new crypto_ctx (k, 1); 945 octx = new crypto_ctx (k, 1);
967 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; 946 oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff;
968 947
969 // compatibility code, remove when no longer required
970 if (p->flags & 1) p->features |= FEATURE_COMPRESSION;
971
972 conf->protocols = p->protocols; 948 conf->protocols = p->protocols;
973 features = p->features & config_packet::get_features (); 949 features = p->features & config_packet::get_features ();
974 950
975 send_auth_response (rsi, p->id, k); 951 send_auth_response (rsi, p->id, k);
976 952
… …
1042 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"), 1018 slog (L_INFO, _("%s(%s): connection established, protocol version %d.%d"),
1043 conf->nodename, (const char *)rsi, 1019 conf->nodename, (const char *)rsi,
1044 p->prot_major, p->prot_minor); 1020 p->prot_major, p->prot_minor);
1045 1021
1046 if (::conf.script_node_up) 1022 if (::conf.script_node_up)
1047 run_script (run_script_cb (this, &connection::script_node_up), false); 1023 if (!run_script (run_script_cb (this, &connection::script_node_up), false))
1024 slog (L_WARN, _("node-up command execution failed, continuing."));
1048 1025
1049 break; 1026 break;
1050 } 1027 }
1051 else 1028 else
1052 slog (L_ERR, _("%s(%s): sent and received challenge do not match"), 1029 slog (L_ERR, _("%s(%s): sent and received challenge do not match"),
… …
1192 send_vpn_packet (p, si); 1169 send_vpn_packet (p, si);
1193 1170
1194 delete p; 1171 delete p;
1195} 1172}
1196 1173
1174void connection::script_init_env (const char *ext)
1175{
1176 char *env;
1177 asprintf (&env, "IFUPDATA%s=%s", ext, conf->if_up_data); putenv (env);
1178 asprintf (&env, "NODENAME%s=%s", ext, conf->nodename); putenv (env);
1179 asprintf (&env, "MAC%s=%02x:%02x:%02x:%02x:%02x:%02x", ext,
1180 0xfe, 0xfd, 0x80, 0x00, conf->id >> 8,
1181 conf->id & 0xff); putenv (env);
1182}
1183
1197void connection::script_node () 1184void connection::script_init_connect_env ()
1198{ 1185{
1199 vpn->script_if_up (); 1186 vpn->script_init_env ();
1200 1187
1201 char *env; 1188 char *env;
1202 asprintf (&env, "DESTID=%d", conf->id); putenv (env); 1189 asprintf (&env, "DESTID=%d", conf->id); putenv (env);
1203 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env); 1190 asprintf (&env, "DESTNODE=%s", conf->nodename); putenv (env);
1204 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env); 1191 asprintf (&env, "DESTIP=%s", si.ntoa ()); putenv (env);
1205 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env); 1192 asprintf (&env, "DESTPORT=%d", ntohs (si.port)); putenv (env);
1206} 1193}
1207 1194
1208const char *connection::script_node_up () 1195const char *connection::script_node_up ()
1209{ 1196{
1210 script_node (); 1197 script_init_connect_env ();
1211 1198
1212 putenv ("STATE=up"); 1199 putenv ("STATE=up");
1213 1200
1201 char *filename;
1202 asprintf (&filename,
1203 "%s/%s",
1204 confbase,
1214 return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; 1205 ::conf.script_node_up ? ::conf.script_node_up : "node-up");
1206
1207 return filename;
1215} 1208}
1216 1209
1217const char *connection::script_node_down () 1210const char *connection::script_node_down ()
1218{ 1211{
1219 script_node (); 1212 script_init_connect_env ();
1220 1213
1221 putenv ("STATE=down"); 1214 putenv ("STATE=down");
1222 1215
1223 return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; 1216 char *filename;
1217 asprintf (&filename,
1218 "%s/%s",
1219 confbase,
1220 ::conf.script_node_down ? ::conf.script_node_down : "node-down");
1221
1222 return filename;
1224} 1223}
1225 1224
1226connection::connection (struct vpn *vpn, conf_node *conf) 1225connection::connection (struct vpn *vpn, conf_node *conf)
1227: vpn(vpn), conf(conf) 1226: vpn(vpn), conf(conf)
1228, rekey (this, &connection::rekey_cb) 1227, rekey (this, &connection::rekey_cb)

Diff Legend

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