1 | /* |
1 | /* |
2 | connection.C -- manage a single connection |
2 | connection.C -- manage a single connection |
|
|
3 | Copyright (C) 2003-2004 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. |
… | |
… | |
20 | |
21 | |
21 | extern "C" { |
22 | extern "C" { |
22 | # include "lzf/lzf.h" |
23 | # include "lzf/lzf.h" |
23 | } |
24 | } |
24 | |
25 | |
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|
26 | #include <cassert> |
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27 | |
25 | #include <list> |
28 | #include <list> |
26 | |
29 | |
27 | #include <openssl/rand.h> |
30 | #include <openssl/rand.h> |
28 | #include <openssl/evp.h> |
31 | #include <openssl/evp.h> |
29 | #include <openssl/rsa.h> |
32 | #include <openssl/rsa.h> |
… | |
… | |
35 | #include "slog.h" |
38 | #include "slog.h" |
36 | #include "device.h" |
39 | #include "device.h" |
37 | #include "vpn.h" |
40 | #include "vpn.h" |
38 | #include "connection.h" |
41 | #include "connection.h" |
39 | |
42 | |
|
|
43 | #include "netcompat.h" |
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|
44 | |
40 | #if !HAVE_RAND_PSEUDO_BYTES |
45 | #if !HAVE_RAND_PSEUDO_BYTES |
41 | # define RAND_pseudo_bytes RAND_bytes |
46 | # define RAND_pseudo_bytes RAND_bytes |
42 | #endif |
47 | #endif |
43 | |
48 | |
44 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
49 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
… | |
… | |
53 | }; |
58 | }; |
54 | |
59 | |
55 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
60 | crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
56 | { |
61 | { |
57 | EVP_CIPHER_CTX_init (&cctx); |
62 | EVP_CIPHER_CTX_init (&cctx); |
58 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
63 | require (EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc)); |
59 | HMAC_CTX_init (&hctx); |
64 | HMAC_CTX_init (&hctx); |
60 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
65 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
61 | } |
66 | } |
62 | |
67 | |
63 | crypto_ctx::~crypto_ctx () |
68 | crypto_ctx::~crypto_ctx () |
64 | { |
69 | { |
65 | EVP_CIPHER_CTX_cleanup (&cctx); |
70 | require (EVP_CIPHER_CTX_cleanup (&cctx)); |
66 | HMAC_CTX_cleanup (&hctx); |
71 | HMAC_CTX_cleanup (&hctx); |
67 | } |
72 | } |
68 | |
73 | |
69 | static void |
74 | static void |
70 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
75 | rsa_hash (const rsaid &id, const rsachallenge &chg, rsaresponse &h) |
71 | { |
76 | { |
72 | EVP_MD_CTX ctx; |
77 | EVP_MD_CTX ctx; |
73 | |
78 | |
74 | EVP_MD_CTX_init (&ctx); |
79 | EVP_MD_CTX_init (&ctx); |
75 | EVP_DigestInit (&ctx, RSA_HASH); |
80 | require (EVP_DigestInit (&ctx, RSA_HASH)); |
76 | EVP_DigestUpdate(&ctx, &chg, sizeof chg); |
81 | require (EVP_DigestUpdate(&ctx, &chg, sizeof chg)); |
77 | EVP_DigestUpdate(&ctx, &id, sizeof id); |
82 | require (EVP_DigestUpdate(&ctx, &id, sizeof id)); |
78 | EVP_DigestFinal (&ctx, (unsigned char *)&h, 0); |
83 | require (EVP_DigestFinal (&ctx, (unsigned char *)&h, 0)); |
79 | EVP_MD_CTX_cleanup (&ctx); |
84 | EVP_MD_CTX_cleanup (&ctx); |
80 | } |
85 | } |
81 | |
86 | |
82 | struct rsa_entry { |
87 | struct rsa_entry { |
83 | tstamp expire; |
88 | tstamp expire; |
… | |
… | |
131 | |
136 | |
132 | } rsa_cache; |
137 | } rsa_cache; |
133 | |
138 | |
134 | void rsa_cache::cleaner_cb (time_watcher &w) |
139 | void rsa_cache::cleaner_cb (time_watcher &w) |
135 | { |
140 | { |
136 | if (empty ()) |
141 | if (!empty ()) |
137 | w.at = TSTAMP_CANCEL; |
|
|
138 | else |
|
|
139 | { |
142 | { |
140 | w.at = NOW + RSA_TTL; |
143 | w.start (NOW + RSA_TTL); |
141 | |
144 | |
142 | for (iterator i = begin (); i != end (); ) |
145 | for (iterator i = begin (); i != end (); ) |
143 | if (i->expire <= NOW) |
146 | if (i->expire <= NOW) |
144 | i = erase (i); |
147 | i = erase (i); |
145 | else |
148 | else |
… | |
… | |
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. |
200 | struct net_rate_limiter : list<net_rateinfo> |
203 | struct 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 | |
211 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
214 | net_rate_limiter auth_rate_limiter, reset_rate_limiter; |
212 | |
215 | |
… | |
… | |
307 | } |
310 | } |
308 | |
311 | |
309 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
312 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
310 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
313 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
311 | |
314 | |
312 | struct vpndata_packet:vpn_packet |
315 | struct vpndata_packet : vpn_packet |
313 | { |
316 | { |
314 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
317 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
315 | |
318 | |
316 | 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); |
317 | tap_packet *unpack (connection *conn, u32 &seqno); |
320 | tap_packet *unpack (connection *conn, u32 &seqno); |
… | |
… | |
344 | d[0] = cl >> 8; |
347 | d[0] = cl >> 8; |
345 | d[1] = cl; |
348 | d[1] = cl; |
346 | } |
349 | } |
347 | #endif |
350 | #endif |
348 | |
351 | |
349 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
352 | require (EVP_EncryptInit_ex (cctx, 0, 0, 0, 0)); |
350 | |
353 | |
351 | struct { |
354 | struct { |
352 | #if RAND_SIZE |
355 | #if RAND_SIZE |
353 | u8 rnd[RAND_SIZE]; |
356 | u8 rnd[RAND_SIZE]; |
354 | #endif |
357 | #endif |
… | |
… | |
358 | datahdr.seqno = ntohl (seqno); |
361 | datahdr.seqno = ntohl (seqno); |
359 | #if RAND_SIZE |
362 | #if RAND_SIZE |
360 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
363 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
361 | #endif |
364 | #endif |
362 | |
365 | |
363 | EVP_EncryptUpdate (cctx, |
366 | require (EVP_EncryptUpdate (cctx, |
364 | (unsigned char *) data + outl, &outl2, |
367 | (unsigned char *) data + outl, &outl2, |
365 | (unsigned char *) &datahdr, DATAHDR); |
368 | (unsigned char *) &datahdr, DATAHDR)); |
366 | outl += outl2; |
369 | outl += outl2; |
367 | |
370 | |
368 | EVP_EncryptUpdate (cctx, |
371 | require (EVP_EncryptUpdate (cctx, |
369 | (unsigned char *) data + outl, &outl2, |
372 | (unsigned char *) data + outl, &outl2, |
370 | (unsigned char *) d, l); |
373 | (unsigned char *) d, l)); |
371 | outl += outl2; |
374 | outl += outl2; |
372 | |
375 | |
373 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
376 | require (EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2)); |
374 | outl += outl2; |
377 | outl += outl2; |
375 | |
378 | |
376 | len = outl + data_hdr_size (); |
379 | len = outl + data_hdr_size (); |
377 | |
380 | |
378 | set_hdr (type, dst); |
381 | set_hdr (type, dst); |
… | |
… | |
387 | int outl = 0, outl2; |
390 | int outl = 0, outl2; |
388 | tap_packet *p = new tap_packet; |
391 | tap_packet *p = new tap_packet; |
389 | u8 *d; |
392 | u8 *d; |
390 | u32 l = len - data_hdr_size (); |
393 | u32 l = len - data_hdr_size (); |
391 | |
394 | |
392 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
395 | require (EVP_DecryptInit_ex (cctx, 0, 0, 0, 0)); |
393 | |
396 | |
394 | #if ENABLE_COMPRESSION |
397 | #if ENABLE_COMPRESSION |
395 | u8 cdata[MAX_MTU]; |
398 | u8 cdata[MAX_MTU]; |
396 | |
399 | |
397 | if (type == PT_DATA_COMPRESSED) |
400 | if (type == PT_DATA_COMPRESSED) |
… | |
… | |
399 | else |
402 | else |
400 | #endif |
403 | #endif |
401 | d = &(*p)[6 + 6 - DATAHDR]; |
404 | d = &(*p)[6 + 6 - DATAHDR]; |
402 | |
405 | |
403 | /* this overwrites part of the src mac, but we fix that later */ |
406 | /* this overwrites part of the src mac, but we fix that later */ |
404 | EVP_DecryptUpdate (cctx, |
407 | require (EVP_DecryptUpdate (cctx, |
405 | d, &outl2, |
408 | d, &outl2, |
406 | (unsigned char *)&data, len - data_hdr_size ()); |
409 | (unsigned char *)&data, len - data_hdr_size ())); |
407 | outl += outl2; |
410 | outl += outl2; |
408 | |
411 | |
409 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
412 | require (EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2)); |
410 | outl += outl2; |
413 | outl += outl2; |
411 | |
414 | |
412 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
415 | seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
413 | |
416 | |
414 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
417 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
… | |
… | |
475 | set_hdr (type, dst); |
478 | set_hdr (type, dst); |
476 | } |
479 | } |
477 | |
480 | |
478 | bool config_packet::chk_config () const |
481 | bool config_packet::chk_config () const |
479 | { |
482 | { |
480 | return prot_major == PROTOCOL_MAJOR |
483 | if (prot_major != PROTOCOL_MAJOR) |
481 | && randsize == RAND_SIZE |
484 | slog (L_WARN, _("major version mismatch (remote %d <=> local %d)"), prot_major, PROTOCOL_MAJOR); |
482 | && hmaclen == HMACLENGTH |
485 | else if (randsize != RAND_SIZE) |
483 | && flags == curflags () |
486 | slog (L_WARN, _("rand size mismatch (remote %d <=> local %d)"), randsize, RAND_SIZE); |
|
|
487 | else if (hmaclen != HMACLENGTH) |
|
|
488 | slog (L_WARN, _("hmac length mismatch (remote %d <=> local %d)"), hmaclen, HMACLENGTH); |
|
|
489 | else if (flags != curflags ()) |
|
|
490 | slog (L_WARN, _("flag mismatch (remote %x <=> local %x)"), flags, curflags ()); |
484 | && challengelen == sizeof (rsachallenge) |
491 | else if (challengelen != sizeof (rsachallenge)) |
|
|
492 | slog (L_WARN, _("challenge length mismatch (remote %d <=> local %d)"), challengelen, sizeof (rsachallenge)); |
485 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
493 | else if (cipher_nid != htonl (EVP_CIPHER_nid (CIPHER))) |
|
|
494 | slog (L_WARN, _("cipher mismatch (remote %x <=> local %x)"), ntohl (cipher_nid), EVP_CIPHER_nid (CIPHER)); |
486 | && 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 (remote %x <=> local %x)"), ntohl (digest_nid), EVP_MD_type (RSA_HASH)); |
487 | && hmac_nid == htonl (EVP_MD_type (DIGEST)); |
497 | else if (hmac_nid != htonl (EVP_MD_type (DIGEST))) |
|
|
498 | slog (L_WARN, _("hmac mismatch (remote %x <=> local %x)"), ntohl (hmac_nid), EVP_MD_type (DIGEST)); |
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|
499 | else |
|
|
500 | return true; |
|
|
501 | |
|
|
502 | return false; |
488 | } |
503 | } |
489 | |
504 | |
490 | struct auth_req_packet : config_packet |
505 | struct auth_req_packet : config_packet |
491 | { |
506 | { |
492 | char magic[8]; |
507 | char magic[8]; |
493 | u8 initiate; // false if this is just an automatic reply |
508 | u8 initiate; // false if this is just an automatic reply |
494 | u8 protocols; // supported protocols (will get patches on forward) |
509 | u8 protocols; // supported protocols (will be patched on forward) |
495 | u8 pad2, pad3; |
510 | u8 pad2, pad3; |
496 | rsaid id; |
511 | rsaid id; |
497 | rsaencrdata encr; |
512 | rsaencrdata encr; |
498 | |
513 | |
499 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
514 | auth_req_packet (int dst, bool initiate_, u8 protocols_) |
… | |
… | |
583 | } |
598 | } |
584 | else |
599 | else |
585 | { |
600 | { |
586 | retry_cnt = 0; |
601 | retry_cnt = 0; |
587 | establish_connection.start (NOW + 5); |
602 | establish_connection.start (NOW + 5); |
588 | keepalive.reset (); |
603 | keepalive.stop (); |
589 | rekey.reset (); |
604 | rekey.stop (); |
590 | } |
605 | } |
591 | } |
606 | } |
592 | |
607 | |
593 | void |
608 | void |
594 | connection::reset_si () |
609 | connection::reset_si () |
… | |
… | |
660 | connection::send_auth_request (const sockinfo &si, bool initiate) |
675 | connection::send_auth_request (const sockinfo &si, bool initiate) |
661 | { |
676 | { |
662 | 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); |
663 | |
678 | |
664 | rsachallenge chg; |
679 | rsachallenge chg; |
665 | |
|
|
666 | rsa_cache.gen (pkt->id, chg); |
680 | rsa_cache.gen (pkt->id, chg); |
667 | |
681 | rsa_encrypt (conf->rsa_key, chg, pkt->encr); |
668 | if (0 > RSA_public_encrypt (sizeof chg, |
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|
669 | (unsigned char *)&chg, (unsigned char *)&pkt->encr, |
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|
670 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
671 | fatal ("RSA_public_encrypt error"); |
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|
672 | |
682 | |
673 | 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); |
674 | |
684 | |
675 | 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 |
676 | |
686 | |
… | |
… | |
710 | } |
720 | } |
711 | |
721 | |
712 | void |
722 | void |
713 | connection::establish_connection_cb (time_watcher &w) |
723 | connection::establish_connection_cb (time_watcher &w) |
714 | { |
724 | { |
715 | if (ictx || conf == THISNODE |
725 | if (!ictx |
|
|
726 | && conf != THISNODE |
716 | || connectmode == conf_node::C_NEVER |
727 | && connectmode != conf_node::C_NEVER |
717 | || connectmode == conf_node::C_DISABLED) |
728 | && connectmode != conf_node::C_DISABLED |
718 | w.at = TSTAMP_CANCEL; |
729 | && NOW > w.at) |
719 | else if (w.at <= NOW) |
|
|
720 | { |
730 | { |
721 | 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; |
722 | |
732 | |
723 | if (retry_int < 3600 * 8) |
733 | if (retry_int < 3600 * 8) |
724 | retry_cnt++; |
734 | retry_cnt++; |
725 | |
735 | |
726 | w.at = NOW + retry_int; |
736 | w.start (NOW + retry_int); |
727 | |
737 | |
728 | reset_si (); |
738 | reset_si (); |
729 | |
739 | |
730 | if (si.prot && !si.host) |
740 | if (si.prot && !si.host) |
731 | vpn->send_connect_request (conf->id); |
741 | vpn->send_connect_request (conf->id); |
… | |
… | |
762 | si.host= 0; |
772 | si.host= 0; |
763 | |
773 | |
764 | last_activity = 0; |
774 | last_activity = 0; |
765 | retry_cnt = 0; |
775 | retry_cnt = 0; |
766 | |
776 | |
767 | rekey.reset (); |
777 | rekey.stop (); |
768 | keepalive.reset (); |
778 | keepalive.stop (); |
769 | establish_connection.reset (); |
779 | establish_connection.stop (); |
770 | } |
780 | } |
771 | |
781 | |
772 | void |
782 | void |
773 | connection::shutdown () |
783 | connection::shutdown () |
774 | { |
784 | { |
… | |
… | |
779 | } |
789 | } |
780 | |
790 | |
781 | void |
791 | void |
782 | connection::rekey_cb (time_watcher &w) |
792 | connection::rekey_cb (time_watcher &w) |
783 | { |
793 | { |
784 | w.at = TSTAMP_CANCEL; |
|
|
785 | |
|
|
786 | reset_connection (); |
794 | reset_connection (); |
787 | establish_connection (); |
795 | establish_connection (); |
788 | } |
796 | } |
789 | |
797 | |
790 | void |
798 | void |
791 | connection::send_data_packet (tap_packet *pkt, bool broadcast) |
799 | connection::send_data_packet (tap_packet *pkt) |
792 | { |
800 | { |
793 | vpndata_packet *p = new vpndata_packet; |
801 | vpndata_packet *p = new vpndata_packet; |
794 | int tos = 0; |
802 | int tos = 0; |
795 | |
803 | |
796 | // I am not hilarious about peeking into packets, but so be it. |
804 | // I am not hilarious about peeking into packets, but so be it. |
797 | if (conf->inherit_tos |
805 | if (conf->inherit_tos && pkt->is_ipv4 ()) |
798 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
|
|
799 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
800 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
806 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
801 | |
807 | |
802 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
808 | p->setup (this, conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
803 | send_vpn_packet (p, si, tos); |
809 | send_vpn_packet (p, si, tos); |
804 | |
810 | |
805 | delete p; |
811 | delete p; |
806 | |
812 | |
807 | if (oseqno > MAX_SEQNO) |
813 | if (oseqno > MAX_SEQNO) |
808 | rekey (); |
814 | rekey (); |
809 | } |
815 | } |
810 | |
816 | |
811 | void |
817 | void |
812 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
818 | connection::inject_data_packet (tap_packet *pkt, bool broadcast/*TODO DDD*/) |
813 | { |
819 | { |
814 | if (ictx && octx) |
820 | if (ictx && octx) |
815 | send_data_packet (pkt, broadcast); |
821 | send_data_packet (pkt); |
816 | else |
822 | else |
817 | { |
823 | { |
818 | if (!broadcast)//DDDD |
824 | if (!broadcast)//DDDD |
819 | data_queue.put (new tap_packet (*pkt)); |
825 | data_queue.put (new tap_packet (*pkt)); |
820 | |
826 | |
… | |
… | |
826 | { |
832 | { |
827 | if (ictx && octx) |
833 | if (ictx && octx) |
828 | send_vpn_packet (pkt, si, tos); |
834 | send_vpn_packet (pkt, si, tos); |
829 | else |
835 | else |
830 | { |
836 | { |
831 | vpn_queue.put (new vpn_packet (*pkt)); |
837 | vpn_queue.put ((vpn_packet *)new data_packet (*(data_packet *)pkt)); |
832 | |
838 | |
833 | establish_connection (); |
839 | establish_connection (); |
834 | } |
840 | } |
835 | } |
841 | } |
836 | |
842 | |
… | |
… | |
895 | if (p->initiate) |
901 | if (p->initiate) |
896 | send_auth_request (rsi, false); |
902 | send_auth_request (rsi, false); |
897 | |
903 | |
898 | rsachallenge k; |
904 | rsachallenge k; |
899 | |
905 | |
900 | if (0 > RSA_private_decrypt (sizeof (p->encr), |
906 | if (!rsa_decrypt (::conf.rsa_key, p->encr, k)) |
901 | (unsigned char *)&p->encr, (unsigned char *)&k, |
907 | { |
902 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
903 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted"), |
908 | slog (L_ERR, _("%s(%s): challenge illegal or corrupted (%s). mismatched key or config file?"), |
904 | conf->nodename, (const char *)rsi); |
909 | conf->nodename, (const char *)rsi, ERR_error_string (ERR_get_error (), 0)); |
|
|
910 | break; |
|
|
911 | } |
905 | else |
912 | else |
906 | { |
913 | { |
907 | delete octx; |
914 | delete octx; |
908 | |
915 | |
909 | octx = new crypto_ctx (k, 1); |
916 | octx = new crypto_ctx (k, 1); |
… | |
… | |
916 | connection_established (); |
923 | connection_established (); |
917 | |
924 | |
918 | break; |
925 | break; |
919 | } |
926 | } |
920 | } |
927 | } |
|
|
928 | else |
|
|
929 | slog (L_WARN, _("%s(%s): protocol mismatch"), |
|
|
930 | conf->nodename, (const char *)rsi); |
921 | |
931 | |
922 | send_reset (rsi); |
932 | send_reset (rsi); |
923 | } |
933 | } |
924 | |
934 | |
925 | break; |
935 | break; |
… | |
… | |
939 | |
949 | |
940 | rsachallenge chg; |
950 | rsachallenge chg; |
941 | |
951 | |
942 | if (!rsa_cache.find (p->id, chg)) |
952 | if (!rsa_cache.find (p->id, chg)) |
943 | { |
953 | { |
944 | slog (L_ERR, _("%s(%s): unrequested auth response"), |
954 | slog (L_ERR, _("%s(%s): unrequested auth response ignored"), |
945 | conf->nodename, (const char *)rsi); |
955 | conf->nodename, (const char *)rsi); |
946 | break; |
956 | break; |
947 | } |
957 | } |
948 | else |
958 | else |
949 | { |
959 | { |
950 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
960 | crypto_ctx *cctx = new crypto_ctx (chg, 0); |
951 | |
961 | |
952 | if (!p->hmac_chk (cctx)) |
962 | if (!p->hmac_chk (cctx)) |
|
|
963 | { |
953 | 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" |
954 | "could be an attack, or just corruption or an synchronization error"), |
965 | "could be an attack, or just corruption or a synchronization error"), |
955 | conf->nodename, (const char *)rsi); |
966 | conf->nodename, (const char *)rsi); |
|
|
967 | break; |
|
|
968 | } |
956 | else |
969 | else |
957 | { |
970 | { |
958 | rsaresponse h; |
971 | rsaresponse h; |
959 | |
972 | |
960 | rsa_hash (p->id, chg, h); |
973 | rsa_hash (p->id, chg, h); |
… | |
… | |
1006 | { |
1019 | { |
1007 | vpndata_packet *p = (vpndata_packet *)pkt; |
1020 | vpndata_packet *p = (vpndata_packet *)pkt; |
1008 | |
1021 | |
1009 | if (!p->hmac_chk (ictx)) |
1022 | if (!p->hmac_chk (ictx)) |
1010 | 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" |
1011 | "could be an attack, or just corruption or an synchronization error"), |
1024 | "could be an attack, or just corruption or a synchronization error"), |
1012 | conf->nodename, (const char *)rsi); |
1025 | conf->nodename, (const char *)rsi); |
1013 | else |
1026 | else |
1014 | { |
1027 | { |
1015 | u32 seqno; |
1028 | u32 seqno; |
1016 | tap_packet *d = p->unpack (this, seqno); |
1029 | tap_packet *d = p->unpack (this, seqno); |
1017 | |
1030 | |
1018 | if (iseqno.recv_ok (seqno)) |
1031 | if (iseqno.recv_ok (seqno)) |
1019 | { |
1032 | { |
1020 | vpn->tap->send (d); |
1033 | vpn->tap->send (d); |
1021 | |
1034 | |
1022 | if (p->dst () == 0) // re-broadcast |
|
|
1023 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
1024 | { |
|
|
1025 | connection *c = *i; |
|
|
1026 | |
|
|
1027 | if (c->conf != THISNODE && c->conf != conf) |
|
|
1028 | c->inject_data_packet (d); |
|
|
1029 | } |
|
|
1030 | |
|
|
1031 | if (si != rsi) |
1035 | if (si != rsi) |
1032 | { |
1036 | { |
1033 | // fast re-sync on conneciton changes, useful especially for tcp/ip |
1037 | // fast re-sync on connection changes, useful especially for tcp/ip |
1034 | si = rsi; |
1038 | si = rsi; |
1035 | |
1039 | |
1036 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1040 | slog (L_INFO, _("%s(%s): socket address changed to %s"), |
1037 | conf->nodename, (const char *)si, (const char *)rsi); |
1041 | conf->nodename, (const char *)si, (const char *)rsi); |
1038 | } |
1042 | } |
… | |
… | |
1108 | { |
1112 | { |
1109 | reset_connection (); |
1113 | reset_connection (); |
1110 | establish_connection (); |
1114 | establish_connection (); |
1111 | } |
1115 | } |
1112 | else if (NOW < last_activity + ::conf.keepalive) |
1116 | else if (NOW < last_activity + ::conf.keepalive) |
1113 | w.at = last_activity + ::conf.keepalive; |
1117 | w.start (last_activity + ::conf.keepalive); |
1114 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1118 | else if (conf->connectmode != conf_node::C_ONDEMAND |
1115 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1119 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
1116 | { |
1120 | { |
1117 | send_ping (si); |
1121 | send_ping (si); |
1118 | w.at = NOW + 5; |
1122 | w.start (NOW + 5); |
1119 | } |
1123 | } |
1120 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1124 | else if (NOW < last_activity + ::conf.keepalive + 10) |
1121 | // hold ondemand connections implicitly a few seconds longer |
1125 | // hold ondemand connections implicitly a few seconds longer |
1122 | // should delete octx, though, or something like that ;) |
1126 | // should delete octx, though, or something like that ;) |
1123 | w.at = last_activity + ::conf.keepalive + 10; |
1127 | w.start (last_activity + ::conf.keepalive + 10); |
1124 | else |
1128 | else |
1125 | reset_connection (); |
1129 | reset_connection (); |
1126 | } |
1130 | } |
1127 | |
1131 | |
1128 | void connection::send_connect_request (int id) |
1132 | void connection::send_connect_request (int id) |