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Comparing gvpe/src/connection.C (file contents):
Revision 1.15 by pcg, Fri Aug 8 10:58:28 2003 UTC vs.
Revision 1.23 by pcg, Wed Oct 22 00:42:53 2003 UTC

1/* 1/*
2 connection.C -- manage a single connection 2 connection.C -- manage a single connection
3 Copyright (C) 2003 Marc Lehmann <pcg@goof.com>
3 4
4 This program is free software; you can redistribute it and/or modify 5 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by 6 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or 7 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version. 8 (at your option) any later version.
… …
35#include "slog.h" 36#include "slog.h"
36#include "device.h" 37#include "device.h"
37#include "vpn.h" 38#include "vpn.h"
38#include "connection.h" 39#include "connection.h"
39 40
41#include "netcompat.h"
42
40#if !HAVE_RAND_PSEUDO_BYTES 43#if !HAVE_RAND_PSEUDO_BYTES
41# define RAND_pseudo_bytes RAND_bytes 44# define RAND_pseudo_bytes RAND_bytes
42#endif 45#endif
43 46
44#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic 47#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic
… …
197// only do action once every x seconds per host whole allowing bursts. 200// only do action once every x seconds per host whole allowing bursts.
198// this implementation ("splay list" ;) is inefficient, 201// this implementation ("splay list" ;) is inefficient,
199// but low on resources. 202// but low on resources.
200struct net_rate_limiter : list<net_rateinfo> 203struct net_rate_limiter : list<net_rateinfo>
201{ 204{
202 static const double ALPHA = 1. - 1. / 180.; // allow bursts 205 static const double ALPHA = 1. - 1. / 600.; // allow bursts
203 static const double CUTOFF = 10.; // one event every CUTOFF seconds 206 static const double CUTOFF = 10.; // one event every CUTOFF seconds
204 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time 207 static const double EXPIRE = CUTOFF * 30.; // expire entries after this time
205 static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value 208 static const double MAXDIF = CUTOFF * (1. / (1. - ALPHA)); // maximum diff /count value
206 209
207 bool can (const sockinfo &si) { return can((u32)si.host); } 210 bool can (const sockinfo &si) { return can((u32)si.host); }
208 bool can (u32 host); 211 bool can (u32 host);
209}; 212};
210 213
211net_rate_limiter auth_rate_limiter, reset_rate_limiter; 214net_rate_limiter auth_rate_limiter, reset_rate_limiter;
212 215
… …
476} 479}
477 480
478bool config_packet::chk_config () const 481bool config_packet::chk_config () const
479{ 482{
480 if (prot_major != PROTOCOL_MAJOR) 483 if (prot_major != PROTOCOL_MAJOR)
481 slog (L_WARN, _("major version mismatch (%d <=> %d)"), prot_major, PROTOCOL_MAJOR); 484 slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR);
482 else if (randsize != RAND_SIZE) 485 else if (randsize != RAND_SIZE)
483 slog (L_WARN, _("rand size mismatch (%d <=> %d)"), randsize, RAND_SIZE); 486 slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE);
484 else if (hmaclen != HMACLENGTH) 487 else if (hmaclen != HMACLENGTH)
485 slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); 488 slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH);
486 else if (flags != curflags ()) 489 else if (flags != curflags ())
487 slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); 490 slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ());
488 else if (challengelen != sizeof (rsachallenge)) 491 else if (challengelen != sizeof (rsachallenge))
489 slog (L_WARN, _("challenge length mismatch (%d <=> %d)"), challengelen, sizeof (rsachallenge)); 492 slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge));
490 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) 493 else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER)))
491 slog (L_WARN, _("cipher mismatch (%x <=> %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); 494 slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER));
492 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) 495 else if (digest_nid != htonl (EVP_MD_type (RSA_HASH)))
493 slog (L_WARN, _("digest mismatch (%x <=> %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); 496 slog (L_WARN, _("digest mismatch (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH));
494 else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) 497 else if (hmac_nid != htonl (EVP_MD_type (DIGEST)))
495 slog (L_WARN, _("hmac mismatch (%x <=> %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); 498 slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST));
496 else 499 else
497 return true; 500 return true;
498 501
499 return false; 502 return false;
500} 503}
… …
798 reset_connection (); 801 reset_connection ();
799 establish_connection (); 802 establish_connection ();
800} 803}
801 804
802void 805void
803connection::send_data_packet (tap_packet *pkt, bool broadcast) 806connection::send_data_packet (tap_packet *pkt)
804{ 807{
805 vpndata_packet *p = new vpndata_packet; 808 vpndata_packet *p = new vpndata_packet;
806 int tos = 0; 809 int tos = 0;
807 810
808 // I am not hilarious about peeking into packets, but so be it. 811 // I am not hilarious about peeking into packets, but so be it.
809 if (conf->inherit_tos 812 if (conf->inherit_tos && pkt->is_ipv4 ())
810 && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP
811 && ((*pkt)[14] & 0xf0) == 0x40) // IPv4
812 tos = (*pkt)[15] & IPTOS_TOS_MASK; 813 tos = (*pkt)[15] & IPTOS_TOS_MASK;
813 814
814 p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs 815 p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs
815 send_vpn_packet (p, si, tos); 816 send_vpn_packet (p, si, tos);
816 817
817 delete p; 818 delete p;
818 819
819 if (oseqno > MAX_SEQNO) 820 if (oseqno > MAX_SEQNO)
820 rekey (); 821 rekey ();
821} 822}
822 823
823void 824void
824connection::inject_data_packet (tap_packet *pkt, bool broadcast) 825connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/)
825{ 826{
826 if (ictx && octx) 827 if (ictx && octx)
827 send_data_packet (pkt, broadcast); 828 send_data_packet (pkt);
828 else 829 else
829 { 830 {
830 if (!broadcast)//DDDD 831 if (!broadcast)//DDDD
831 data_queue.put (new tap_packet (*pkt)); 832 data_queue.put (new tap_packet (*pkt));
832 833
… …
910 rsachallenge k; 911 rsachallenge k;
911 912
912 if (0 > RSA_private_decrypt (sizeof (p->encr), 913 if (0 > RSA_private_decrypt (sizeof (p->encr),
913 (unsigned char *)&p->encr, (unsigned char *)&k, 914 (unsigned char *)&p->encr, (unsigned char *)&k,
914 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) 915 ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING))
916 {
915 slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), 917 slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"),
916 conf->nodename, (const char *)rsi); 918 conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0));
919 break;
920 }
917 else 921 else
918 { 922 {
919 delete octx; 923 delete octx;
920 924
921 octx = new crypto_ctx (k, 1); 925 octx = new crypto_ctx (k, 1);
… …
954 958
955 rsachallenge chg; 959 rsachallenge chg;
956 960
957 if (!rsa_cache.find (p->id, chg)) 961 if (!rsa_cache.find (p->id, chg))
958 { 962 {
959 slog (L_ERR, _("%s(%s): unrequested auth response"), 963 slog (L_ERR, _("%s(%s): unrequested auth response ignored"),
960 conf->nodename, (const char *)rsi); 964 conf->nodename, (const char *)rsi);
961 break; 965 break;
962 } 966 }
963 else 967 else
964 { 968 {
965 crypto_ctx *cctx = new crypto_ctx (chg, 0); 969 crypto_ctx *cctx = new crypto_ctx (chg, 0);
966 970
967 if (!p->hmac_chk (cctx)) 971 if (!p->hmac_chk (cctx))
972 {
968 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" 973 slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n"
969 "could be an attack, or just corruption or an synchronization error"), 974 "could be an attack, or just corruption or an synchronization error"),
970 conf->nodename, (const char *)rsi); 975 conf->nodename, (const char *)rsi);
976 break;
977 }
971 else 978 else
972 { 979 {
973 rsaresponse h; 980 rsaresponse h;
974 981
975 rsa_hash (p->id, chg, h); 982 rsa_hash (p->id, chg, h);
… …
1031 tap_packet *d = p->unpack (this, seqno); 1038 tap_packet *d = p->unpack (this, seqno);
1032 1039
1033 if (iseqno.recv_ok (seqno)) 1040 if (iseqno.recv_ok (seqno))
1034 { 1041 {
1035 vpn->tap->send (d); 1042 vpn->tap->send (d);
1036
1037 if (p->dst () == 0) // re-broadcast
1038 for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i)
1039 {
1040 connection *c = *i;
1041
1042 if (c->conf != THISNODE && c->conf != conf)
1043 c->inject_data_packet (d);
1044 }
1045 1043
1046 if (si != rsi) 1044 if (si != rsi)
1047 { 1045 {
1048 // fast re-sync on connection changes, useful especially for tcp/ip 1046 // fast re-sync on connection changes, useful especially for tcp/ip
1049 si = rsi; 1047 si = rsi;

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