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 | Copyright (C) 2003-2004 Marc Lehmann <pcg@goof.com> |
4 | |
4 | |
5 | 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 |
6 | 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 |
7 | the Free Software Foundation; either version 2 of the License, or |
7 | the Free Software Foundation; either version 2 of the License, or |
8 | (at your option) any later version. |
8 | (at your option) any later version. |
… | |
… | |
21 | |
21 | |
22 | extern "C" { |
22 | extern "C" { |
23 | # include "lzf/lzf.h" |
23 | # include "lzf/lzf.h" |
24 | } |
24 | } |
25 | |
25 | |
|
|
26 | #include <cassert> |
|
|
27 | |
26 | #include <list> |
28 | #include <list> |
27 | |
29 | |
28 | #include <openssl/rand.h> |
30 | #include <openssl/rand.h> |
29 | #include <openssl/evp.h> |
31 | #include <openssl/evp.h> |
30 | #include <openssl/rsa.h> |
32 | #include <openssl/rsa.h> |
… | |
… | |
134 | |
136 | |
135 | } rsa_cache; |
137 | } rsa_cache; |
136 | |
138 | |
137 | void rsa_cache::cleaner_cb (time_watcher &w) |
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
138 | { |
140 | { |
139 | if (empty ()) |
141 | if (!empty ()) |
140 | w.at = TSTAMP_CANCEL; |
|
|
141 | else |
|
|
142 | { |
142 | { |
143 | w.at = NOW + RSA_TTL; |
143 | w.start (NOW + RSA_TTL); |
144 | |
144 | |
145 | for (iterator i = begin (); i != end (); ) |
145 | for (iterator i = begin (); i != end (); ) |
146 | if (i->expire <= NOW) |
146 | if (i->expire <= NOW) |
147 | i = erase (i); |
147 | i = erase (i); |
148 | else |
148 | else |
… | |
… | |
310 | } |
310 | } |
311 | |
311 | |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
314 | |
314 | |
315 | struct vpndata_packet:vpn_packet |
315 | struct vpndata_packet : vpn_packet |
316 | { |
316 | { |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
318 | |
318 | |
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
319 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
479 | } |
479 | } |
480 | |
480 | |
481 | bool config_packet::chk_config () const |
481 | bool config_packet::chk_config () const |
482 | { |
482 | { |
483 | if (prot_major != PROTOCOL_MAJOR) |
483 | if (prot_major != PROTOCOL_MAJOR) |
484 | 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); |
485 | else if (randsize != RAND_SIZE) |
485 | else if (randsize != RAND_SIZE) |
486 | 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); |
487 | else if (hmaclen != HMACLENGTH) |
487 | else if (hmaclen != HMACLENGTH) |
488 | slog (L_WARN, _("hmac length mismatch (%d <=> %d)"), hmaclen, HMACLENGTH); |
488 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
489 | else if (flags != curflags ()) |
489 | else if (flags != curflags ()) |
490 | slog (L_WARN, _("flag mismatch (%x <=> %x)"), flags, curflags ()); |
490 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
491 | else if (challengelen != sizeof (rsachallenge)) |
491 | else if (challengelen != sizeof (rsachallenge)) |
492 | 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)); |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
494 | 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)); |
495 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
495 | else if (digest_nid != htonl (EVP_MD_type (RSA_HASH))) |
496 | 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)); |
497 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
497 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
498 | 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)); |
499 | else |
499 | else |
500 | return true; |
500 | return true; |
501 | |
501 | |
502 | return false; |
502 | return false; |
503 | } |
503 | } |
504 | |
504 | |
505 | struct auth_req_packet : config_packet |
505 | struct auth_req_packet : config_packet |
506 | { |
506 | { |
507 | char magic[8]; |
507 | char magic[8]; |
508 | u8 initiate; // false if this is just an automatic reply |
508 | u8 initiate; // false if this is just an automatic reply |
509 | u8 protocols; // supported protocols (will get patches on forward) |
509 | u8 protocols; // supported protocols (will be patched on forward) |
510 | u8 pad2, pad3; |
510 | u8 pad2, pad3; |
511 | rsaid id; |
511 | rsaid id; |
512 | rsaencrdata encr; |
512 | rsaencrdata encr; |
513 | |
513 | |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
598 | } |
598 | } |
599 | else |
599 | else |
600 | { |
600 | { |
601 | retry_cnt = 0; |
601 | retry_cnt = 0; |
602 | establish_connection.start (NOW + 5); |
602 | establish_connection.start (NOW + 5); |
603 | keepalive.reset (); |
603 | keepalive.stop (); |
604 | rekey.reset (); |
604 | rekey.stop (); |
605 | } |
605 | } |
606 | } |
606 | } |
607 | |
607 | |
608 | void |
608 | void |
609 | connection::reset_si () |
609 | connection::reset_si () |
… | |
… | |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
676 | { |
676 | { |
677 | 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); |
678 | |
678 | |
679 | rsachallenge chg; |
679 | rsachallenge chg; |
680 | |
|
|
681 | rsa_cache.gen (pkt->id, chg); |
680 | rsa_cache.gen (pkt->id, chg); |
682 | |
681 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
683 | if (0 > RSA_public_encrypt (sizeof chg, |
|
|
684 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
|
|
685 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
686 | fatal ("RSA_public_encrypt error"); |
|
|
687 | |
682 | |
688 | 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); |
689 | |
684 | |
690 | 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 |
691 | |
686 | |
… | |
… | |
725 | } |
720 | } |
726 | |
721 | |
727 | void |
722 | void |
728 | connection::establish_connection_cb (time_watcher &w) |
723 | connection::establish_connection_cb (time_watcher &w) |
729 | { |
724 | { |
730 | if (ictx || conf == THISNODE |
725 | if (!ictx |
|
|
726 | && conf != THISNODE |
731 | || connectmode == conf_node::C_NEVER |
727 | && connectmode != conf_node::C_NEVER |
732 | || connectmode == conf_node::C_DISABLED) |
728 | && connectmode != conf_node::C_DISABLED |
733 | w.at = TSTAMP_CANCEL; |
729 | && NOW > w.at) |
734 | else if (w.at <= NOW) |
|
|
735 | { |
730 | { |
736 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
731 | double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.6; |
737 | |
732 | |
738 | if (retry_int < 3600 * 8) |
733 | if (retry_int < 3600 * 8) |
739 | retry_cnt++; |
734 | retry_cnt++; |
740 | |
735 | |
741 | w.at = NOW + retry_int; |
736 | w.start (NOW + retry_int); |
742 | |
737 | |
743 | reset_si (); |
738 | reset_si (); |
744 | |
739 | |
745 | if (si.prot && !si.host) |
740 | if (si.prot && !si.host) |
746 | vpn->send_connect_request (conf->id); |
741 | vpn->send_connect_request (conf->id); |
… | |
… | |
777 | si.host= 0; |
772 | si.host= 0; |
778 | |
773 | |
779 | last_activity = 0; |
774 | last_activity = 0; |
780 | retry_cnt = 0; |
775 | retry_cnt = 0; |
781 | |
776 | |
782 | rekey.reset (); |
777 | rekey.stop (); |
783 | keepalive.reset (); |
778 | keepalive.stop (); |
784 | establish_connection.reset (); |
779 | establish_connection.stop (); |
785 | } |
780 | } |
786 | |
781 | |
787 | void |
782 | void |
788 | connection::shutdown () |
783 | connection::shutdown () |
789 | { |
784 | { |
… | |
… | |
794 | } |
789 | } |
795 | |
790 | |
796 | void |
791 | void |
797 | connection::rekey_cb (time_watcher &w) |
792 | connection::rekey_cb (time_watcher &w) |
798 | { |
793 | { |
799 | w.at = TSTAMP_CANCEL; |
|
|
800 | |
|
|
801 | reset_connection (); |
794 | reset_connection (); |
802 | establish_connection (); |
795 | establish_connection (); |
803 | } |
796 | } |
804 | |
797 | |
805 | void |
798 | void |
… | |
… | |
839 | { |
832 | { |
840 | if (ictx && octx) |
833 | if (ictx && octx) |
841 | send_vpn_packet (pkt, si, tos); |
834 | send_vpn_packet (pkt, si, tos); |
842 | else |
835 | else |
843 | { |
836 | { |
844 | vpn_queue.put (new vpn_packet (*pkt)); |
837 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
845 | |
838 | |
846 | establish_connection (); |
839 | establish_connection (); |
847 | } |
840 | } |
848 | } |
841 | } |
849 | |
842 | |
… | |
… | |
908 | if (p->initiate) |
901 | if (p->initiate) |
909 | send_auth_request (rsi, false); |
902 | send_auth_request (rsi, false); |
910 | |
903 | |
911 | rsachallenge k; |
904 | rsachallenge k; |
912 | |
905 | |
913 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
906 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
914 | (unsigned char *)&p->encr, (unsigned char *)&k, |
907 | { |
915 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
916 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
908 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
917 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
909 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
910 | break; |
|
|
911 | } |
918 | else |
912 | else |
919 | { |
913 | { |
920 | delete octx; |
914 | delete octx; |
921 | |
915 | |
922 | octx = new crypto_ctx (k, 1); |
916 | octx = new crypto_ctx (k, 1); |
… | |
… | |
966 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
960 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
967 | |
961 | |
968 | if (!p->hmac_chk (cctx)) |
962 | if (!p->hmac_chk (cctx)) |
969 | { |
963 | { |
970 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
964 | slog (L_ERR, _("%s(%s): hmac authentication error on auth response, received invalid packet\n" |
971 | "could be an attack, or just corruption or an synchronization error"), |
965 | "could be an attack, or just corruption or a synchronization error"), |
972 | conf->nodename, (const char *)rsi); |
966 | conf->nodename, (const char *)rsi); |
973 | break; |
967 | break; |
974 | } |
968 | } |
975 | else |
969 | else |
976 | { |
970 | { |
… | |
… | |
1025 | { |
1019 | { |
1026 | vpndata_packet *p = (vpndata_packet *)pkt; |
1020 | vpndata_packet *p = (vpndata_packet *)pkt; |
1027 | |
1021 | |
1028 | if (!p->hmac_chk (ictx)) |
1022 | if (!p->hmac_chk (ictx)) |
1029 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1023 | slog (L_ERR, _("%s(%s): hmac authentication error, received invalid packet\n" |
1030 | "could be an attack, or just corruption or an synchronization error"), |
1024 | "could be an attack, or just corruption or a synchronization error"), |
1031 | conf->nodename, (const char *)rsi); |
1025 | conf->nodename, (const char *)rsi); |
1032 | else |
1026 | else |
1033 | { |
1027 | { |
1034 | u32 seqno; |
1028 | u32 seqno; |
1035 | tap_packet *d = p->unpack (this, seqno); |
1029 | tap_packet *d = p->unpack (this, seqno); |
… | |
… | |
1118 | { |
1112 | { |
1119 | reset_connection (); |
1113 | reset_connection (); |
1120 | establish_connection (); |
1114 | establish_connection (); |
1121 | } |
1115 | } |
1122 | else if (NOW < last_activity + ::conf.keepalive) |
1116 | else if (NOW < last_activity + ::conf.keepalive) |
1123 | w.at = last_activity + ::conf.keepalive; |
1117 | w.start (last_activity + ::conf.keepalive); |
1124 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1118 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1125 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1119 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1126 | { |
1120 | { |
1127 | send_ping (si); |
1121 | send_ping (si); |
1128 | w.at = NOW + 5; |
1122 | w.start (NOW + 5); |
1129 | } |
1123 | } |
1130 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1124 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1131 | // hold ondemand connections implicitly a few seconds longer |
1125 | // hold ondemand connections implicitly a few seconds longer |
1132 | // should delete octx, though, or something like that ;) |
1126 | // should delete octx, though, or something like that ;) |
1133 | w.at = last_activity + ::conf.keepalive + 10; |
1127 | w.start (last_activity + ::conf.keepalive + 10); |
1134 | else |
1128 | else |
1135 | reset_connection (); |
1129 | reset_connection (); |
1136 | } |
1130 | } |
1137 | |
1131 | |
1138 | void connection::send_connect_request (int id) |
1132 | void connection::send_connect_request (int id) |