| 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 | |
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|
41 | #include "netcompat.h" |
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|
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 |
| … | |
… | |
| 476 | } |
479 | } |
| 477 | |
480 | |
| 478 | bool config_packet::chk_config () const |
481 | bool 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 | } |
| … | |
… | |
| 672 | connection::send_auth_request (const sockinfo &si, bool initiate) |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
| 673 | { |
676 | { |
| 674 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
677 | auth_req_packet *pkt = new auth_req_packet (conf->id, initiate, THISNODE->protocols); |
| 675 | |
678 | |
| 676 | rsachallenge chg; |
679 | rsachallenge chg; |
| 677 | |
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|
| 678 | rsa_cache.gen (pkt->id, chg); |
680 | rsa_cache.gen (pkt->id, chg); |
| 679 | |
681 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
| 680 | if (0 > RSA_public_encrypt (sizeof chg, |
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| 681 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
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| 682 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 683 | fatal ("RSA_public_encrypt error"); |
|
|
| 684 | |
682 | |
| 685 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
683 | slog (L_TRACE, ">>%d PT_AUTH_REQ [%s]", conf->id, (const char *)si); |
| 686 | |
684 | |
| 687 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
685 | send_vpn_packet (pkt, si, IPTOS_RELIABILITY | IPTOS_LOWDELAY); // rsa is very very costly |
| 688 | |
686 | |
| … | |
… | |
| 798 | reset_connection (); |
796 | reset_connection (); |
| 799 | establish_connection (); |
797 | establish_connection (); |
| 800 | } |
798 | } |
| 801 | |
799 | |
| 802 | void |
800 | void |
| 803 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
801 | connection::send_data_packet (tap_packet *pkt) |
| 804 | { |
802 | { |
| 805 | vpndata_packet *p = new vpndata_packet; |
803 | vpndata_packet *p = new vpndata_packet; |
| 806 | int tos = 0; |
804 | int tos = 0; |
| 807 | |
805 | |
| 808 | // I am not hilarious about peeking into packets, but so be it. |
806 | // I am not hilarious about peeking into packets, but so be it. |
| 809 | if (conf->inherit_tos |
807 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
| 810 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
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|
| 811 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
| 812 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
808 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
| 813 | |
809 | |
| 814 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
810 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
| 815 | send_vpn_packet (p, si, tos); |
811 | send_vpn_packet (p, si, tos); |
| 816 | |
812 | |
| 817 | delete p; |
813 | delete p; |
| 818 | |
814 | |
| 819 | if (oseqno > MAX_SEQNO) |
815 | if (oseqno > MAX_SEQNO) |
| 820 | rekey (); |
816 | rekey (); |
| 821 | } |
817 | } |
| 822 | |
818 | |
| 823 | void |
819 | void |
| 824 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
820 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
| 825 | { |
821 | { |
| 826 | if (ictx && octx) |
822 | if (ictx && octx) |
| 827 | send_data_packet (pkt, broadcast); |
823 | send_data_packet (pkt); |
| 828 | else |
824 | else |
| 829 | { |
825 | { |
| 830 | if (!broadcast)//DDDD |
826 | if (!broadcast)//DDDD |
| 831 | data_queue.put (new tap_packet (*pkt)); |
827 | data_queue.put (new tap_packet (*pkt)); |
| 832 | |
828 | |
| … | |
… | |
| 907 | if (p->initiate) |
903 | if (p->initiate) |
| 908 | send_auth_request (rsi, false); |
904 | send_auth_request (rsi, false); |
| 909 | |
905 | |
| 910 | rsachallenge k; |
906 | rsachallenge k; |
| 911 | |
907 | |
| 912 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
908 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
| 913 | (unsigned char *)&p->encr, (unsigned char *)&k, |
909 | { |
| 914 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 915 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
910 | 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)); |
911 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
912 | break; |
|
|
913 | } |
| 917 | else |
914 | else |
| 918 | { |
915 | { |
| 919 | delete octx; |
916 | delete octx; |
| 920 | |
917 | |
| 921 | octx = new crypto_ctx (k, 1); |
918 | octx = new crypto_ctx (k, 1); |
| … | |
… | |
| 1035 | |
1032 | |
| 1036 | if (iseqno.recv_ok (seqno)) |
1033 | if (iseqno.recv_ok (seqno)) |
| 1037 | { |
1034 | { |
| 1038 | vpn->tap->send (d); |
1035 | vpn->tap->send (d); |
| 1039 | |
1036 | |
| 1040 | if (p->dst () == 0) // re-broadcast |
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| 1041 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
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| 1042 | { |
|
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| 1043 | connection *c = *i; |
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| 1044 | |
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| 1045 | if (c->conf != THISNODE && c->conf != conf) |
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| 1046 | c->inject_data_packet (d); |
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| 1047 | } |
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| 1048 | |
|
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| 1049 | if (si != rsi) |
1037 | if (si != rsi) |
| 1050 | { |
1038 | { |
| 1051 | // fast re-sync on connection changes, useful especially for tcp/ip |
1039 | // fast re-sync on connection changes, useful especially for tcp/ip |
| 1052 | si = rsi; |
1040 | si = rsi; |
| 1053 | |
1041 | |
