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/* |
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protocol.C -- handle the protocol, encryption, handshaking etc. |
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|
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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|
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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|
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include "config.h" |
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|
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#include <cstdlib> |
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#include <cstring> |
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#include <cstdio> |
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|
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/poll.h> |
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#include <sys/wait.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#include <errno.h> |
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#include <time.h> |
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#include <unistd.h> |
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|
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#include <openssl/rand.h> |
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#include <openssl/hmac.h> |
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#include <openssl/evp.h> |
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#include <openssl/rsa.h> |
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#include <openssl/err.h> |
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|
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extern "C" { |
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# include "lzf/lzf.h" |
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} |
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|
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#include "gettext.h" |
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#include "pidfile.h" |
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|
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#include "conf.h" |
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#include "slog.h" |
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#include "device.h" |
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#include "protocol.h" |
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|
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#if !HAVE_RAND_PSEUDO_BYTES |
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# define RAND_pseudo_bytes RAND_bytes |
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#endif |
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|
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static time_t next_timecheck; |
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|
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#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
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|
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static const rsachallenge & |
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challenge_bytes () |
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{ |
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static rsachallenge challenge; |
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static time_t challenge_ttl; // time this challenge needs to be recreated |
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|
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if (now > challenge_ttl) |
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{ |
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RAND_bytes ((unsigned char *)&challenge, sizeof (challenge)); |
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challenge_ttl = now + CHALLENGE_TTL; |
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} |
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|
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return challenge; |
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} |
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|
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// run a script. yes, it's a template function. yes, c++ |
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// is not a functional language. yes, this suxx. |
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template<class owner> |
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static void |
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run_script (owner *obj, const char *(owner::*setup)(), bool wait) |
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{ |
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int pid; |
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|
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if ((pid = fork ()) == 0) |
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{ |
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char *filename; |
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asprintf (&filename, "%s/%s", confbase, (obj->*setup) ()); |
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execl (filename, filename, (char *) 0); |
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exit (255); |
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} |
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else if (pid > 0) |
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{ |
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if (wait) |
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{ |
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waitpid (pid, 0, 0); |
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/* TODO: check status */ |
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} |
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} |
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} |
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|
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// xor the socket address into the challenge to ensure different challenges |
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// per host. we could rely on the OAEP padding, but this doesn't hurt. |
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void |
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xor_sa (rsachallenge &k, SOCKADDR *sa) |
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{ |
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((u32 *) k)[(CHG_CIPHER_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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((u16 *) k)[(CHG_CIPHER_KEY + 4) / 2] ^= sa->sin_port; |
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((u32 *) k)[(CHG_HMAC_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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((u16 *) k)[(CHG_HMAC_KEY + 4) / 2] ^= sa->sin_port; |
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} |
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|
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struct crypto_ctx |
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{ |
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EVP_CIPHER_CTX cctx; |
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HMAC_CTX hctx; |
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|
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crypto_ctx (rsachallenge &challenge, int enc); |
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~crypto_ctx (); |
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}; |
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|
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crypto_ctx::crypto_ctx (rsachallenge &challenge, int enc) |
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{ |
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EVP_CIPHER_CTX_init (&cctx); |
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EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
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HMAC_CTX_init (&hctx); |
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HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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} |
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|
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crypto_ctx::~crypto_ctx () |
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{ |
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EVP_CIPHER_CTX_cleanup (&cctx); |
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HMAC_CTX_cleanup (&hctx); |
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} |
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|
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///////////////////////////////////////////////////////////////////////////// |
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|
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static void next_wakeup (time_t next) |
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{ |
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if (next_timecheck > next) |
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next_timecheck = next; |
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} |
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|
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static unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
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|
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struct hmac_packet:net_packet |
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{ |
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u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
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|
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void hmac_set (crypto_ctx * ctx); |
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bool hmac_chk (crypto_ctx * ctx); |
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|
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private: |
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void hmac_gen (crypto_ctx * ctx) |
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{ |
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unsigned int xlen; |
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HMAC_CTX *hctx = &ctx->hctx; |
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|
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HMAC_Init_ex (hctx, 0, 0, 0, 0); |
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HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
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len - sizeof (hmac_packet)); |
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HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
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} |
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}; |
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|
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void |
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hmac_packet::hmac_set (crypto_ctx * ctx) |
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{ |
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hmac_gen (ctx); |
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|
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memcpy (hmac, hmac_digest, HMACLENGTH); |
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} |
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|
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bool |
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hmac_packet::hmac_chk (crypto_ctx * ctx) |
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{ |
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hmac_gen (ctx); |
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|
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return !memcmp (hmac, hmac_digest, HMACLENGTH); |
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} |
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|
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struct vpn_packet : hmac_packet |
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{ |
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enum ptype |
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{ |
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PT_RESET = 0, |
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PT_DATA_UNCOMPRESSED, |
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PT_DATA_COMPRESSED, |
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PT_PING, PT_PONG, // wasting namespace space? ;) |
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PT_AUTH, // authentification |
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PT_CONNECT_REQ, // want other host to contact me |
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PT_CONNECT_INFO, // request connection to some node |
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PT_REKEY, // rekeying (not yet implemented) |
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PT_MAX |
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}; |
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|
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u8 type; |
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u8 srcdst, src1, dst1; |
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|
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void set_hdr (ptype type, unsigned int dst); |
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|
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unsigned int src () |
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{ |
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return src1 | ((srcdst >> 4) << 8); |
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} |
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unsigned int dst () |
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{ |
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return dst1 | ((srcdst & 0xf) << 8); |
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} |
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ptype typ () |
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{ |
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return (ptype) type; |
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} |
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}; |
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|
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void vpn_packet::set_hdr (ptype type, unsigned int dst) |
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{ |
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this->type = type; |
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|
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int src = THISNODE->id; |
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|
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src1 = src; |
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srcdst = ((src >> 8) << 4) | (dst >> 8); |
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dst1 = dst; |
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} |
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|
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#define MAXVPNDATA (MAX_MTU - 6 - 6) |
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#define DATAHDR (sizeof (u32) + RAND_SIZE) |
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|
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struct vpndata_packet:vpn_packet |
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{ |
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u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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|
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void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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tap_packet *unpack (connection *conn, u32 &seqno); |
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private: |
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|
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const u32 data_hdr_size () const |
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{ |
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return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
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} |
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}; |
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|
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void |
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vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
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{ |
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EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
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int outl = 0, outl2; |
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ptype type = PT_DATA_UNCOMPRESSED; |
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|
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#if ENABLE_COMPRESSION |
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u8 cdata[MAX_MTU]; |
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u32 cl; |
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|
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cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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if (cl) |
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{ |
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//printf ("compressed packet, %d => %d\n", l, cl);//D |
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type = PT_DATA_COMPRESSED; |
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d = cdata; |
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l = cl + 2; |
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|
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d[0] = cl >> 8; |
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d[1] = cl; |
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} |
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#endif |
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|
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EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
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|
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#if RAND_SIZE |
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struct { |
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u8 rnd[RAND_SIZE]; |
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u32 seqno; |
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} datahdr; |
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|
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datahdr.seqno = seqno; |
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RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
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|
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EVP_EncryptUpdate (cctx, |
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(unsigned char *) data + outl, &outl2, |
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(unsigned char *) &datahdr, DATAHDR); |
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outl += outl2; |
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#else |
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EVP_EncryptUpdate (cctx, |
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(unsigned char *) data + outl, &outl2, |
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(unsigned char *) &seqno, DATAHDR); |
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outl += outl2; |
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#endif |
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|
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EVP_EncryptUpdate (cctx, |
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(unsigned char *) data + outl, &outl2, |
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(unsigned char *) d, l); |
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outl += outl2; |
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|
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EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
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outl += outl2; |
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|
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len = outl + data_hdr_size (); |
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|
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set_hdr (type, dst); |
300 |
|
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hmac_set (conn->octx); |
302 |
} |
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|
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tap_packet * |
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vpndata_packet::unpack (connection *conn, u32 &seqno) |
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{ |
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EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
308 |
int outl = 0, outl2; |
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tap_packet *p = new tap_packet; |
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u8 *d; |
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u32 l = len - data_hdr_size (); |
312 |
|
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EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
314 |
|
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#if ENABLE_COMPRESSION |
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u8 cdata[MAX_MTU]; |
317 |
|
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if (type == PT_DATA_COMPRESSED) |
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d = cdata; |
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else |
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#endif |
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d = &(*p)[6 + 6 - DATAHDR]; |
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|
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/* this overwrites part of the src mac, but we fix that later */ |
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EVP_DecryptUpdate (cctx, |
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d, &outl2, |
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(unsigned char *)&data, len - data_hdr_size ()); |
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outl += outl2; |
329 |
|
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EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
331 |
outl += outl2; |
332 |
|
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seqno = *(u32 *)(d + RAND_SIZE); |
334 |
|
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id2mac (dst () ? dst() : THISNODE->id, p->dst); |
336 |
id2mac (src (), p->src); |
337 |
|
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#if ENABLE_COMPRESSION |
339 |
if (type == PT_DATA_COMPRESSED) |
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{ |
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u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
342 |
p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6; |
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//printf ("decompressxed %d(%d) => %d\n", cl, len - data_hdr_size (), p->len);//D |
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} |
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else |
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p->len = outl + (6 + 6 - DATAHDR); |
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#endif |
348 |
|
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return p; |
350 |
} |
351 |
|
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struct ping_packet : vpn_packet |
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{ |
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void setup (int dst, ptype type) |
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{ |
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set_hdr (type, dst); |
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len = sizeof (*this) - sizeof (net_packet); |
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} |
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}; |
360 |
|
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struct config_packet : vpn_packet |
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{ |
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// actually, hmaclen cannot be checked because the hmac |
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// field comes before this data, so peers with other |
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// hmacs simply will not work. |
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u8 prot_major, prot_minor, randsize, hmaclen; |
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u8 flags, challengelen, pad2, pad3; |
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u32 cipher_nid; |
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u32 digest_nid; |
370 |
|
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const u8 curflags () const |
372 |
{ |
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return 0x80 |
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| (ENABLE_COMPRESSION ? 0x01 : 0x00) |
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| (ENABLE_TRUST ? 0x02 : 0x00); |
376 |
} |
377 |
|
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void setup (ptype type, int dst) |
379 |
{ |
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prot_major = PROTOCOL_MAJOR; |
381 |
prot_minor = PROTOCOL_MINOR; |
382 |
randsize = RAND_SIZE; |
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hmaclen = HMACLENGTH; |
384 |
flags = curflags (); |
385 |
challengelen = sizeof (rsachallenge); |
386 |
|
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cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
388 |
digest_nid = htonl (EVP_MD_type (DIGEST)); |
389 |
|
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len = sizeof (*this) - sizeof (net_packet); |
391 |
set_hdr (type, dst); |
392 |
} |
393 |
|
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bool chk_config () |
395 |
{ |
396 |
return prot_major == PROTOCOL_MAJOR |
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&& randsize == RAND_SIZE |
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&& hmaclen == HMACLENGTH |
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&& flags == curflags () |
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&& challengelen == sizeof (rsachallenge) |
401 |
&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
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&& digest_nid == htonl (EVP_MD_type (DIGEST)); |
403 |
} |
404 |
}; |
405 |
|
406 |
struct auth_packet : config_packet |
407 |
{ |
408 |
char magic[8]; |
409 |
u8 subtype; |
410 |
u8 pad1, pad2; |
411 |
rsaencrdata challenge; |
412 |
|
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auth_packet (int dst, auth_subtype stype) |
414 |
{ |
415 |
config_packet::setup (PT_AUTH, dst); |
416 |
subtype = stype; |
417 |
len = sizeof (*this) - sizeof (net_packet); |
418 |
strncpy (magic, MAGIC, 8); |
419 |
} |
420 |
}; |
421 |
|
422 |
struct connect_req_packet : vpn_packet |
423 |
{ |
424 |
u8 id; |
425 |
u8 pad1, pad2, pad3; |
426 |
|
427 |
connect_req_packet (int dst, int id) |
428 |
{ |
429 |
this->id = id; |
430 |
set_hdr (PT_CONNECT_REQ, dst); |
431 |
len = sizeof (*this) - sizeof (net_packet); |
432 |
} |
433 |
}; |
434 |
|
435 |
struct connect_info_packet : vpn_packet |
436 |
{ |
437 |
u8 id; |
438 |
u8 pad1, pad2, pad3; |
439 |
sockinfo si; |
440 |
|
441 |
connect_info_packet (int dst, int id, sockinfo &si) |
442 |
{ |
443 |
this->id = id; |
444 |
this->si = si; |
445 |
set_hdr (PT_CONNECT_INFO, dst); |
446 |
len = sizeof (*this) - sizeof (net_packet); |
447 |
} |
448 |
}; |
449 |
|
450 |
///////////////////////////////////////////////////////////////////////////// |
451 |
|
452 |
void |
453 |
fill_sa (SOCKADDR *sa, conf_node *conf) |
454 |
{ |
455 |
sa->sin_family = AF_INET; |
456 |
sa->sin_port = htons (conf->port); |
457 |
sa->sin_addr.s_addr = 0; |
458 |
|
459 |
if (conf->hostname) |
460 |
{ |
461 |
struct hostent *he = gethostbyname (conf->hostname); |
462 |
|
463 |
if (he |
464 |
&& he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0]) |
465 |
{ |
466 |
//sa->sin_family = he->h_addrtype; |
467 |
memcpy (&sa->sin_addr, he->h_addr_list[0], 4); |
468 |
} |
469 |
else |
470 |
slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname); |
471 |
} |
472 |
} |
473 |
|
474 |
void |
475 |
connection::reset_dstaddr () |
476 |
{ |
477 |
fill_sa (&sa, conf); |
478 |
} |
479 |
|
480 |
void |
481 |
connection::send_ping (SOCKADDR *dsa, u8 pong) |
482 |
{ |
483 |
ping_packet *pkt = new ping_packet; |
484 |
|
485 |
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
486 |
vpn->send_vpn_packet (pkt, dsa); |
487 |
|
488 |
delete pkt; |
489 |
} |
490 |
|
491 |
void |
492 |
connection::send_reset (SOCKADDR *dsa) |
493 |
{ |
494 |
static net_rate_limiter limiter(1); |
495 |
|
496 |
if (limiter.can (dsa)) |
497 |
{ |
498 |
config_packet *pkt = new config_packet; |
499 |
|
500 |
pkt->setup (vpn_packet::PT_RESET, conf->id); |
501 |
vpn->send_vpn_packet (pkt, dsa); |
502 |
|
503 |
delete pkt; |
504 |
} |
505 |
} |
506 |
|
507 |
static rsachallenge * |
508 |
gen_challenge (SOCKADDR *sa) |
509 |
{ |
510 |
static rsachallenge k; |
511 |
|
512 |
memcpy (&k, &challenge_bytes (), sizeof (k)); |
513 |
RAND_bytes ((unsigned char *)&k[CHG_SEQNO], sizeof (u32)); |
514 |
xor_sa (k, sa); |
515 |
|
516 |
return &k; |
517 |
} |
518 |
|
519 |
void |
520 |
connection::send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k) |
521 |
{ |
522 |
static net_rate_limiter limiter(2); |
523 |
|
524 |
if (subtype != AUTH_INIT || limiter.can (sa)) |
525 |
{ |
526 |
auth_packet *pkt = new auth_packet (conf->id, subtype); |
527 |
|
528 |
//printf ("send auth_packet subtype %d\n", subtype);//D |
529 |
|
530 |
if (!k) |
531 |
k = gen_challenge (sa); |
532 |
|
533 |
#if ENABLE_TRUST |
534 |
if (0 > RSA_public_encrypt (sizeof (*k), |
535 |
(unsigned char *)k, (unsigned char *)&pkt->challenge, |
536 |
conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
537 |
fatal ("RSA_public_encrypt error"); |
538 |
#else |
539 |
# error untrusted mode not yet implemented: programemr does not know how to |
540 |
rsaencrdata enc; |
541 |
|
542 |
if (0 > RSA_private_encrypt (sizeof (*k), |
543 |
(unsigned char *)k, (unsigned char *)&enc, |
544 |
::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
545 |
fatal ("RSA_private_encrypt error"); |
546 |
|
547 |
if (0 > RSA_public_encrypt (sizeof (enc), |
548 |
(unsigned char *)enc, (unsigned char *)&pkt->challenge, |
549 |
conf->rsa_key, RSA_NO_PADDING)) |
550 |
fatal ("RSA_public_encrypt error"); |
551 |
#endif |
552 |
|
553 |
slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa)); |
554 |
|
555 |
vpn->send_vpn_packet (pkt, sa); |
556 |
|
557 |
delete pkt; |
558 |
} |
559 |
} |
560 |
|
561 |
void |
562 |
connection::establish_connection () |
563 |
{ |
564 |
if (!ictx && conf != THISNODE && conf->connectmode != conf_node::C_NEVER) |
565 |
{ |
566 |
if (now >= next_retry) |
567 |
{ |
568 |
int retry_int = retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2); |
569 |
|
570 |
if (retry_cnt < (17 << 2) | 3) |
571 |
retry_cnt++; |
572 |
|
573 |
if (conf->connectmode == conf_node::C_ONDEMAND |
574 |
&& retry_int > ::conf.keepalive) |
575 |
retry_int = ::conf.keepalive; |
576 |
|
577 |
next_retry = now + retry_int; |
578 |
next_wakeup (next_retry); |
579 |
|
580 |
if (conf->hostname) |
581 |
{ |
582 |
reset_dstaddr (); |
583 |
if (sa.sin_addr.s_addr) |
584 |
if (retry_cnt < 4) |
585 |
send_auth (AUTH_INIT, &sa); |
586 |
else |
587 |
send_ping (&sa, 0); |
588 |
} |
589 |
else |
590 |
vpn->connect_request (conf->id); |
591 |
} |
592 |
} |
593 |
} |
594 |
|
595 |
void |
596 |
connection::reset_connection () |
597 |
{ |
598 |
if (ictx && octx) |
599 |
{ |
600 |
slog (L_INFO, _("connection to %d (%s) lost"), conf->id, conf->nodename); |
601 |
|
602 |
if (::conf.script_node_down) |
603 |
run_script (this, &connection::script_node_down, false); |
604 |
} |
605 |
|
606 |
delete ictx; |
607 |
ictx = 0; |
608 |
|
609 |
delete octx; |
610 |
octx = 0; |
611 |
|
612 |
sa.sin_port = 0; |
613 |
sa.sin_addr.s_addr = 0; |
614 |
|
615 |
next_retry = 0; |
616 |
next_rekey = 0; |
617 |
last_activity = 0; |
618 |
} |
619 |
|
620 |
void |
621 |
connection::shutdown () |
622 |
{ |
623 |
if (ictx && octx) |
624 |
send_reset (&sa); |
625 |
|
626 |
reset_connection (); |
627 |
} |
628 |
|
629 |
void |
630 |
connection::rekey () |
631 |
{ |
632 |
reset_connection (); |
633 |
establish_connection (); |
634 |
} |
635 |
|
636 |
void |
637 |
connection::send_data_packet (tap_packet * pkt, bool broadcast) |
638 |
{ |
639 |
vpndata_packet *p = new vpndata_packet; |
640 |
|
641 |
p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
642 |
vpn->send_vpn_packet (p, &sa); |
643 |
|
644 |
delete p; |
645 |
|
646 |
if (oseqno > MAX_SEQNO) |
647 |
rekey (); |
648 |
} |
649 |
|
650 |
void |
651 |
connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
652 |
{ |
653 |
if (ictx && octx) |
654 |
send_data_packet (pkt, broadcast); |
655 |
else |
656 |
{ |
657 |
if (!broadcast)//DDDD |
658 |
queue.put (new tap_packet (*pkt)); |
659 |
|
660 |
establish_connection (); |
661 |
} |
662 |
} |
663 |
|
664 |
void |
665 |
connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa) |
666 |
{ |
667 |
last_activity = now; |
668 |
|
669 |
slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
670 |
conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
671 |
|
672 |
switch (pkt->typ ()) |
673 |
{ |
674 |
case vpn_packet::PT_PING: |
675 |
send_ping (ssa, 1); // pong |
676 |
break; |
677 |
|
678 |
case vpn_packet::PT_PONG: |
679 |
// we send pings instead of auth packets after some retries, |
680 |
// so reset the retry counter and establish a conenction |
681 |
// when we receive a pong. |
682 |
if (!ictx && !octx) |
683 |
{ |
684 |
retry_cnt = 0; |
685 |
next_retry = 0; |
686 |
establish_connection (); |
687 |
} |
688 |
|
689 |
break; |
690 |
|
691 |
case vpn_packet::PT_RESET: |
692 |
{ |
693 |
reset_connection (); |
694 |
|
695 |
config_packet *p = (config_packet *) pkt; |
696 |
if (p->chk_config ()) |
697 |
if (conf->connectmode == conf_node::C_ALWAYS) |
698 |
establish_connection (); |
699 |
|
700 |
//D slog the protocol mismatch? |
701 |
} |
702 |
break; |
703 |
|
704 |
case vpn_packet::PT_AUTH: |
705 |
{ |
706 |
auth_packet *p = (auth_packet *) pkt; |
707 |
|
708 |
slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype); |
709 |
|
710 |
if (p->chk_config () |
711 |
&& !strncmp (p->magic, MAGIC, 8)) |
712 |
{ |
713 |
if (p->prot_minor != PROTOCOL_MINOR) |
714 |
slog (L_INFO, _("protocol minor version mismatch: ours is %d, %s's is %d."), |
715 |
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
716 |
|
717 |
if (p->subtype == AUTH_INIT) |
718 |
send_auth (AUTH_INITREPLY, ssa); |
719 |
|
720 |
rsachallenge k; |
721 |
|
722 |
#if ENABLE_TRUST |
723 |
if (0 > RSA_private_decrypt (sizeof (rsaencrdata), |
724 |
(unsigned char *)&p->challenge, (unsigned char *)&k, |
725 |
::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
726 |
// continued below |
727 |
#else |
728 |
rsaencrdata j; |
729 |
|
730 |
if (0 > RSA_private_decrypt (sizeof (rsaencrdata), |
731 |
(unsigned char *)&p->challenge, (unsigned char *)&j, |
732 |
::conf.rsa_key, RSA_NO_PADDING)) |
733 |
fatal ("RSA_private_decrypt error"); |
734 |
|
735 |
if (0 > RSA_public_decrypt (sizeof (k), |
736 |
(unsigned char *)&j, (unsigned char *)&k, |
737 |
conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
738 |
// continued below |
739 |
#endif |
740 |
{ |
741 |
slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"), |
742 |
conf->nodename, (const char *)sockinfo (ssa)); |
743 |
break; |
744 |
} |
745 |
|
746 |
retry_cnt = 0; |
747 |
next_retry = now + 8; |
748 |
|
749 |
switch (p->subtype) |
750 |
{ |
751 |
case AUTH_INIT: |
752 |
case AUTH_INITREPLY: |
753 |
delete ictx; |
754 |
ictx = 0; |
755 |
|
756 |
delete octx; |
757 |
|
758 |
octx = new crypto_ctx (k, 1); |
759 |
oseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff; |
760 |
|
761 |
send_auth (AUTH_REPLY, ssa, &k); |
762 |
break; |
763 |
|
764 |
case AUTH_REPLY: |
765 |
|
766 |
if (!memcmp ((u8 *)gen_challenge (ssa) + sizeof (u32), (u8 *)&k + sizeof (u32), |
767 |
sizeof (rsachallenge) - sizeof (u32))) |
768 |
{ |
769 |
delete ictx; |
770 |
|
771 |
ictx = new crypto_ctx (k, 0); |
772 |
iseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff; // at least 2**31 sequence numbers are valid |
773 |
ismask = 0xffffffff; // initially, all lower sequence numbers are invalid |
774 |
|
775 |
sa = *ssa; |
776 |
|
777 |
next_rekey = now + ::conf.rekey; |
778 |
next_wakeup (next_rekey); |
779 |
|
780 |
// send queued packets |
781 |
while (tap_packet *p = queue.get ()) |
782 |
{ |
783 |
send_data_packet (p); |
784 |
delete p; |
785 |
} |
786 |
|
787 |
slog (L_INFO, _("connection to %d (%s %s) established"), |
788 |
conf->id, conf->nodename, (const char *)sockinfo (ssa)); |
789 |
|
790 |
if (::conf.script_node_up) |
791 |
run_script (this, &connection::script_node_up, false); |
792 |
} |
793 |
else |
794 |
slog (L_ERR, _("sent and received challenge do not match with (%s %s))"), |
795 |
conf->nodename, (const char *)sockinfo (ssa)); |
796 |
|
797 |
break; |
798 |
default: |
799 |
slog (L_ERR, _("authentification illegal subtype error (%s %s)"), |
800 |
conf->nodename, (const char *)sockinfo (ssa)); |
801 |
break; |
802 |
} |
803 |
} |
804 |
else |
805 |
send_reset (ssa); |
806 |
|
807 |
break; |
808 |
} |
809 |
|
810 |
case vpn_packet::PT_DATA_COMPRESSED: |
811 |
#if !ENABLE_COMPRESSION |
812 |
send_reset (ssa); |
813 |
break; |
814 |
#endif |
815 |
case vpn_packet::PT_DATA_UNCOMPRESSED: |
816 |
|
817 |
if (ictx && octx) |
818 |
{ |
819 |
vpndata_packet *p = (vpndata_packet *)pkt; |
820 |
|
821 |
if (*ssa == sa) |
822 |
{ |
823 |
if (!p->hmac_chk (ictx)) |
824 |
slog (L_ERR, _("hmac authentication error, received invalid packet\n" |
825 |
"could be an attack, or just corruption or an synchronization error")); |
826 |
else |
827 |
{ |
828 |
u32 seqno; |
829 |
tap_packet *d = p->unpack (this, seqno); |
830 |
|
831 |
if (seqno <= iseqno - 32) |
832 |
slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
833 |
"possible replay attack, or just massive packet reordering"), seqno, iseqno + 1);//D |
834 |
else if (seqno > iseqno + 32) |
835 |
slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
836 |
"possible replay attack, or just massive packet loss"), seqno, iseqno + 1);//D |
837 |
else |
838 |
{ |
839 |
if (seqno > iseqno) |
840 |
{ |
841 |
ismask <<= seqno - iseqno; |
842 |
iseqno = seqno; |
843 |
} |
844 |
|
845 |
u32 mask = 1 << (iseqno - seqno); |
846 |
|
847 |
//printf ("received seqno %08lx, iseqno %08lx, mask %08lx is %08lx\n", seqno, iseqno, mask, ismask); |
848 |
if (ismask & mask) |
849 |
slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
850 |
"possible replay attack, or just packet duplication"), seqno, iseqno + 1);//D |
851 |
else |
852 |
{ |
853 |
ismask |= mask; |
854 |
|
855 |
vpn->tap->send (d); |
856 |
|
857 |
if (p->dst () == 0) // re-broadcast |
858 |
for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
859 |
{ |
860 |
connection *c = *i; |
861 |
|
862 |
if (c->conf != THISNODE && c->conf != conf) |
863 |
c->inject_data_packet (d); |
864 |
} |
865 |
|
866 |
delete d; |
867 |
|
868 |
break; |
869 |
} |
870 |
} |
871 |
} |
872 |
} |
873 |
else |
874 |
slog (L_ERR, _("received data packet from unknown source %s"), (const char *)sockinfo (ssa));//D |
875 |
} |
876 |
|
877 |
send_reset (ssa); |
878 |
break; |
879 |
|
880 |
case vpn_packet::PT_CONNECT_REQ: |
881 |
if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
882 |
{ |
883 |
connect_req_packet *p = (connect_req_packet *) pkt; |
884 |
|
885 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
886 |
|
887 |
connection *c = vpn->conns[p->id - 1]; |
888 |
|
889 |
slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
890 |
conf->id, p->id, c->ictx && c->octx); |
891 |
|
892 |
if (c->ictx && c->octx) |
893 |
{ |
894 |
// send connect_info packets to both sides, in case one is |
895 |
// behind a nat firewall (or both ;) |
896 |
{ |
897 |
sockinfo si(sa); |
898 |
|
899 |
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
900 |
c->conf->id, conf->id, (const char *)si); |
901 |
|
902 |
connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si); |
903 |
|
904 |
r->hmac_set (c->octx); |
905 |
vpn->send_vpn_packet (r, &c->sa); |
906 |
|
907 |
delete r; |
908 |
} |
909 |
|
910 |
{ |
911 |
sockinfo si(c->sa); |
912 |
|
913 |
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
914 |
conf->id, c->conf->id, (const char *)si); |
915 |
|
916 |
connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, si); |
917 |
|
918 |
r->hmac_set (octx); |
919 |
vpn->send_vpn_packet (r, &sa); |
920 |
|
921 |
delete r; |
922 |
} |
923 |
} |
924 |
} |
925 |
|
926 |
break; |
927 |
|
928 |
case vpn_packet::PT_CONNECT_INFO: |
929 |
if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
930 |
{ |
931 |
connect_info_packet *p = (connect_info_packet *) pkt; |
932 |
|
933 |
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
934 |
|
935 |
connection *c = vpn->conns[p->id - 1]; |
936 |
|
937 |
slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
938 |
conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
939 |
|
940 |
c->send_auth (AUTH_INIT, p->si.sa ()); |
941 |
} |
942 |
break; |
943 |
|
944 |
default: |
945 |
send_reset (ssa); |
946 |
break; |
947 |
} |
948 |
} |
949 |
|
950 |
void connection::timer () |
951 |
{ |
952 |
if (conf != THISNODE) |
953 |
{ |
954 |
if (now >= next_retry && conf->connectmode == conf_node::C_ALWAYS) |
955 |
establish_connection (); |
956 |
|
957 |
if (ictx && octx) |
958 |
{ |
959 |
if (now >= next_rekey) |
960 |
rekey (); |
961 |
else if (now >= last_activity + ::conf.keepalive + 30) |
962 |
{ |
963 |
reset_connection (); |
964 |
establish_connection (); |
965 |
} |
966 |
else if (now >= last_activity + ::conf.keepalive) |
967 |
if (conf->connectmode != conf_node::C_ONDEMAND |
968 |
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
969 |
send_ping (&sa); |
970 |
else |
971 |
reset_connection (); |
972 |
|
973 |
} |
974 |
} |
975 |
} |
976 |
|
977 |
void connection::connect_request (int id) |
978 |
{ |
979 |
connect_req_packet *p = new connect_req_packet (conf->id, id); |
980 |
|
981 |
slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id); |
982 |
p->hmac_set (octx); |
983 |
vpn->send_vpn_packet (p, &sa); |
984 |
|
985 |
delete p; |
986 |
} |
987 |
|
988 |
void connection::script_node () |
989 |
{ |
990 |
vpn->script_if_up (); |
991 |
|
992 |
char *env; |
993 |
asprintf (&env, "DESTID=%d", conf->id); |
994 |
putenv (env); |
995 |
asprintf (&env, "DESTNODE=%s", conf->nodename); |
996 |
putenv (env); |
997 |
asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr)); |
998 |
putenv (env); |
999 |
asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port)); |
1000 |
putenv (env); |
1001 |
} |
1002 |
|
1003 |
const char *connection::script_node_up () |
1004 |
{ |
1005 |
script_node (); |
1006 |
|
1007 |
putenv ("STATE=up"); |
1008 |
|
1009 |
return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1010 |
} |
1011 |
|
1012 |
const char *connection::script_node_down () |
1013 |
{ |
1014 |
script_node (); |
1015 |
|
1016 |
putenv ("STATE=down"); |
1017 |
|
1018 |
return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1019 |
} |
1020 |
|
1021 |
///////////////////////////////////////////////////////////////////////////// |
1022 |
|
1023 |
vpn::vpn (void) |
1024 |
{} |
1025 |
|
1026 |
const char *vpn::script_if_up () |
1027 |
{ |
1028 |
// the tunnel device mtu should be the physical mtu - overhead |
1029 |
// the tricky part is rounding to the cipher key blocksize |
1030 |
int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD; |
1031 |
mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
1032 |
mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
1033 |
mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
1034 |
|
1035 |
char *env; |
1036 |
asprintf (&env, "CONFBASE=%s", confbase); |
1037 |
putenv (env); |
1038 |
asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
1039 |
putenv (env); |
1040 |
asprintf (&env, "NODEID=%d", THISNODE->id); |
1041 |
putenv (env); |
1042 |
asprintf (&env, "IFNAME=%s", tap->interface ()); |
1043 |
putenv (env); |
1044 |
asprintf (&env, "MTU=%d", mtu); |
1045 |
putenv (env); |
1046 |
asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
1047 |
0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
1048 |
THISNODE->id & 0xff); |
1049 |
putenv (env); |
1050 |
|
1051 |
return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
1052 |
} |
1053 |
|
1054 |
int |
1055 |
vpn::setup (void) |
1056 |
{ |
1057 |
struct sockaddr_in sa; |
1058 |
|
1059 |
socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1060 |
if (socket_fd < 0) |
1061 |
return -1; |
1062 |
|
1063 |
fill_sa (&sa, THISNODE); |
1064 |
|
1065 |
if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa))) |
1066 |
{ |
1067 |
slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
1068 |
exit (1); |
1069 |
} |
1070 |
|
1071 |
#ifdef IP_MTU_DISCOVER |
1072 |
// this I really consider a linux bug. I am neither connected |
1073 |
// nor do I fragment myself. Linux still sets DF and doesn't |
1074 |
// fragment for me sometimes. |
1075 |
{ |
1076 |
int oval = IP_PMTUDISC_DONT; |
1077 |
setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
1078 |
} |
1079 |
#endif |
1080 |
{ |
1081 |
int oval = 1; |
1082 |
setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
1083 |
} |
1084 |
|
1085 |
tap = new tap_device (); |
1086 |
if (!tap) //D this, of course, never catches |
1087 |
{ |
1088 |
slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
1089 |
exit (1); |
1090 |
} |
1091 |
|
1092 |
run_script (this, &vpn::script_if_up, true); |
1093 |
|
1094 |
return 0; |
1095 |
} |
1096 |
|
1097 |
void |
1098 |
vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa) |
1099 |
{ |
1100 |
sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa)); |
1101 |
} |
1102 |
|
1103 |
void |
1104 |
vpn::shutdown_all () |
1105 |
{ |
1106 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1107 |
(*c)->shutdown (); |
1108 |
} |
1109 |
|
1110 |
void |
1111 |
vpn::reconnect_all () |
1112 |
{ |
1113 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1114 |
delete *c; |
1115 |
|
1116 |
conns.clear (); |
1117 |
|
1118 |
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
1119 |
i != conf.nodes.end (); ++i) |
1120 |
{ |
1121 |
connection *conn = new connection (this); |
1122 |
|
1123 |
conn->conf = *i; |
1124 |
conns.push_back (conn); |
1125 |
|
1126 |
if (conn->conf->connectmode == conf_node::C_ALWAYS) |
1127 |
conn->establish_connection (); |
1128 |
} |
1129 |
} |
1130 |
|
1131 |
connection *vpn::find_router () |
1132 |
{ |
1133 |
u32 prio = 0; |
1134 |
connection *router = 0; |
1135 |
|
1136 |
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
1137 |
{ |
1138 |
connection *c = *i; |
1139 |
|
1140 |
if (c->conf->routerprio > prio |
1141 |
&& c->conf->connectmode == conf_node::C_ALWAYS |
1142 |
&& c->conf != THISNODE |
1143 |
&& c->ictx && c->octx) |
1144 |
{ |
1145 |
prio = c->conf->routerprio; |
1146 |
router = c; |
1147 |
} |
1148 |
} |
1149 |
|
1150 |
return router; |
1151 |
} |
1152 |
|
1153 |
void vpn::connect_request (int id) |
1154 |
{ |
1155 |
connection *c = find_router (); |
1156 |
|
1157 |
if (c) |
1158 |
c->connect_request (id); |
1159 |
//else // does not work, because all others must connect to the same router |
1160 |
// // no router found, aggressively connect to all routers |
1161 |
// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
1162 |
// if ((*i)->conf->routerprio) |
1163 |
// (*i)->establish_connection (); |
1164 |
} |
1165 |
|
1166 |
void |
1167 |
vpn::main_loop () |
1168 |
{ |
1169 |
struct pollfd pollfd[2]; |
1170 |
|
1171 |
pollfd[0].fd = tap->fd; |
1172 |
pollfd[0].events = POLLIN; |
1173 |
pollfd[1].fd = socket_fd; |
1174 |
pollfd[1].events = POLLIN; |
1175 |
|
1176 |
events = 0; |
1177 |
now = time (0); |
1178 |
next_timecheck = now + 1; |
1179 |
|
1180 |
reconnect_all (); |
1181 |
|
1182 |
for (;;) |
1183 |
{ |
1184 |
int npoll = poll (pollfd, 2, (next_timecheck - now) * 1000); |
1185 |
|
1186 |
now = time (0); |
1187 |
|
1188 |
if (npoll > 0) |
1189 |
{ |
1190 |
if (pollfd[1].revents) |
1191 |
{ |
1192 |
if (pollfd[1].revents & (POLLIN | POLLERR)) |
1193 |
{ |
1194 |
vpn_packet *pkt = new vpn_packet; |
1195 |
struct sockaddr_in sa; |
1196 |
socklen_t sa_len = sizeof (sa); |
1197 |
int len; |
1198 |
|
1199 |
len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
1200 |
|
1201 |
if (len > 0) |
1202 |
{ |
1203 |
pkt->len = len; |
1204 |
|
1205 |
unsigned int src = pkt->src (); |
1206 |
unsigned int dst = pkt->dst (); |
1207 |
|
1208 |
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
1209 |
(const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
1210 |
|
1211 |
if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) |
1212 |
slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"), |
1213 |
pkt->typ (), pkt->src (), pkt->dst ()); |
1214 |
else if (dst == 0 && !THISNODE->routerprio) |
1215 |
slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst); |
1216 |
else if (dst != 0 && dst != THISNODE->id) |
1217 |
slog (L_WARN, |
1218 |
_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
1219 |
dst, conns[dst - 1]->conf->nodename, |
1220 |
(const char *)sockinfo (sa), |
1221 |
THISNODE->id, THISNODE->nodename); |
1222 |
else if (src == 0 || src > conns.size ()) |
1223 |
slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa)); |
1224 |
else |
1225 |
conns[src - 1]->recv_vpn_packet (pkt, &sa); |
1226 |
} |
1227 |
else |
1228 |
{ |
1229 |
// probably ECONNRESET or somesuch |
1230 |
slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
1231 |
} |
1232 |
|
1233 |
delete pkt; |
1234 |
} |
1235 |
else if (pollfd[1].revents & POLLHUP) |
1236 |
{ |
1237 |
// this cannot ;) happen on udp sockets |
1238 |
slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating.")); |
1239 |
exit (1); |
1240 |
} |
1241 |
else |
1242 |
{ |
1243 |
slog (L_ERR, |
1244 |
_("FATAL: unknown revents %08x in socket, terminating\n"), |
1245 |
pollfd[1].revents); |
1246 |
exit (1); |
1247 |
} |
1248 |
} |
1249 |
|
1250 |
// I use else here to give vpn_packets absolute priority |
1251 |
else if (pollfd[0].revents) |
1252 |
{ |
1253 |
if (pollfd[0].revents & POLLIN) |
1254 |
{ |
1255 |
/* process data */ |
1256 |
tap_packet *pkt; |
1257 |
|
1258 |
pkt = tap->recv (); |
1259 |
|
1260 |
int dst = mac2id (pkt->dst); |
1261 |
int src = mac2id (pkt->src); |
1262 |
|
1263 |
if (src != THISNODE->id) |
1264 |
{ |
1265 |
slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
1266 |
exit (1); |
1267 |
} |
1268 |
|
1269 |
if (dst == THISNODE->id) |
1270 |
{ |
1271 |
slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
1272 |
exit (1); |
1273 |
} |
1274 |
|
1275 |
if (dst > conns.size ()) |
1276 |
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
1277 |
else |
1278 |
{ |
1279 |
if (dst) |
1280 |
{ |
1281 |
// unicast |
1282 |
if (dst != THISNODE->id) |
1283 |
conns[dst - 1]->inject_data_packet (pkt); |
1284 |
} |
1285 |
else |
1286 |
{ |
1287 |
// broadcast, first check router, then self, then english |
1288 |
connection *router = find_router (); |
1289 |
|
1290 |
if (router) |
1291 |
router->inject_data_packet (pkt, true); |
1292 |
else |
1293 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1294 |
if ((*c)->conf != THISNODE) |
1295 |
(*c)->inject_data_packet (pkt); |
1296 |
} |
1297 |
} |
1298 |
|
1299 |
delete pkt; |
1300 |
} |
1301 |
else if (pollfd[0].revents & (POLLHUP | POLLERR)) |
1302 |
{ |
1303 |
slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
1304 |
exit (1); |
1305 |
} |
1306 |
else |
1307 |
abort (); |
1308 |
} |
1309 |
} |
1310 |
|
1311 |
if (events) |
1312 |
{ |
1313 |
if (events & EVENT_SHUTDOWN) |
1314 |
{ |
1315 |
shutdown_all (); |
1316 |
|
1317 |
remove_pid (pidfilename); |
1318 |
|
1319 |
slog (L_INFO, _("vped terminating")); |
1320 |
|
1321 |
exit (0); |
1322 |
} |
1323 |
|
1324 |
if (events & EVENT_RECONNECT) |
1325 |
reconnect_all (); |
1326 |
|
1327 |
events = 0; |
1328 |
} |
1329 |
|
1330 |
// very very very dumb and crude and inefficient timer handling, or maybe not? |
1331 |
if (now >= next_timecheck) |
1332 |
{ |
1333 |
next_timecheck = now + TIMER_GRANULARITY; |
1334 |
|
1335 |
for (conns_vector::iterator c = conns.begin (); |
1336 |
c != conns.end (); ++c) |
1337 |
(*c)->timer (); |
1338 |
} |
1339 |
} |
1340 |
} |
1341 |
|
1342 |
vpn::~vpn () |
1343 |
{} |
1344 |
|