- New protocol. Will break everything else for now.
This commit is contained in:
Guus Sliepen
parent
7884d3ecaf
commit
28cc301595
1 changed files with 357 additions and 275 deletions
632
src/protocol.c
632
src/protocol.c
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@ -17,7 +17,7 @@
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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$Id: protocol.c,v 1.28.4.24 2000/08/08 17:07:48 guus Exp $
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$Id: protocol.c,v 1.28.4.25 2000/09/10 15:18:03 guus Exp $
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*/
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#include "config.h"
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@ -44,29 +44,359 @@
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#include "system.h"
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char buffer[MAXBUFSIZE+1];
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int buflen;
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/* Generic outgoing request routine - takes care of logging and error detection as well */
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/* Outgoing request routines */
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int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...)
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{
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va_list args;
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char *buffer = NULL;
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cp
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if(debug_lvl >= DEBUG_PROTOCOL)
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syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), requestname[request], cl->id, cl->hostname);
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va_start(args, format);
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len = vasprintf(&buffer, format, args);
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va_end(args);
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if(len < 0 || !buffer)
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{
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syslog(LOG_ERR, _("Error during vasprintf(): %m"));
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return -1;
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}
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if(debug_lvl >= DEBUG_META)
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syslog(LOG_DEBUG, _("Sending meta data to %s (%s): %s"), cl->id, cl->hostname, buffer);
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if(cl->status.encryptout)
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{
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/* FIXME: Do encryption */
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}
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if((write(cl->meta_socket, buffer, buflen)) < 0)
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{
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syslog(LOG_ERR, _("Sending meta data failed: %m"));
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return -1;
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}
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cp
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}
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/* Connection protocol:
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Client Server
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send_id(*)
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send_challenge
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send_chal_reply(*)
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send_id
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send_challenge
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send_chal_reply
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send_ack
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send_ack
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(*) Unencrypted.
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*/
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int send_id(conn_list_t *cl)
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{
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cp
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return send_request(cl, "%d %s %d-%d %s", ID, myself->id, myself->min_version, myself->max_version, opt2str(myself->options));
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}
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int id_h(conn_list_t *cl)
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{
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conn_list_t *old;
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char *options;
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cp
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if(sscanf(cl->buffer, "%*d %as %d-%d %as", &cl->id, &cl->min_version, &cl->max_version, &options) != 4)
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{
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syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
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return -1;
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}
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/* Check if version ranges overlap */
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if((cl->min_version > myself->max_version) || (cl->max_version < myself_min_version) || (cl->min_version > cl->max_version))
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{
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syslog(LOG_ERR, _("Peer %s uses incompatible version (%d-%d)"), cl->hostname, cl->min_version, cl->max_version);
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return -1;
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}
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/* Check if option string is valid */
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if(str2opt(options) == -1)
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{
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syslog(LOG_ERR, _("Peer %s uses invalid option string"), cl->hostname);
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return -1;
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}
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/* Check if identity is a valid name */
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if(!check_id(cl->id))
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{
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syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
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return -1;
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}
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/* Load information about peer */
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if(!read_id(cl))
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{
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syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->id);
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return -1;
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}
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/* First check if the host we connected to is already in our
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connection list. If so, we are probably making a loop, which
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is not desirable.
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*/
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if(cl->status.outgoing)
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{
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if((old=lookup_id(cl->id)))
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{
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if(debug_lvl > DEBUG_CONNECTIONS)
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syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), cl->id, cl->hostname);
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cl->status.outgoing = 0;
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old->status.outgoing = 1;
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terminate_connection(cl);
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return 0;
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}
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}
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/* Since we know the identity now, we can encrypt the meta channel */
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cl->status.encryptout = 1;
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/* Send a challenge to verify the identity */
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cl->allow_request = CHAL_REPLY;
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cp
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return send_challenge(cl);
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}
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int send_challenge(conn_list_t *cl)
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{
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char *buffer;
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int keylength;
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int x;
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cp
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if(cl->chal_hash)
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free(cl->chal_hash);
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/* Allocate buffers for the challenge and the hash */
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cl->chal_hash = xmalloc(SHA_DIGEST_LEN);
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keylength = BN_num_bytes(cl->metakey.n);
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buffer = xmalloc(keylength*2);
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/* Copy random data and the public key to the buffer */
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RAND_bytes(buffer, keylength);
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BN_bn2bin(cl->metakey.n, buffer+keylength);
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/* Calculate the hash from that */
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SHA1(buffer, keylength*2, cl->chal_hash);
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/* Convert the random data to a hexadecimal formatted string */
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bin2hex(buffer,buffer,keylength);
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buffer[keylength*2] = '\0';
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/* Send the challenge */
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cl->allow_request = CHAL_REPLY;
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x = send_request(cl, "%d %s", CHALLENGE, buffer);
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free(buffer);
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cp
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return x;
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}
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int challenge_h(conn_list_t *cl)
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{
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char *challenge;
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cp
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if(sscanf(cl->buffer, "%*d %as", &cl->id, &challenge) != 1)
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{
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syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->id, cl->hostname);
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return -1;
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}
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/* Rest is done by send_chal_reply() */
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x = send_chal_reply(cl, challenge);
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free(challenge);
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cp
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return x;
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}
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int send_chal_reply(conn_list_t *cl, char *challenge)
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{
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char *buffer;
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int keylength;
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char *hash;
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int x;
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cp
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keylength = BN_num_bytes(myself->meyakey.n);
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/* Check if the length of the challenge is all right */
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if(strlen(challenge) != keylength*2)
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{
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syslog(LOG_ERROR, _("Intruder: wrong challenge length from %s (%s)"), cl->id, cl->hostname);
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return -1;
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}
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/* Allocate buffers for the challenge and the hash */
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buffer = xmalloc(keylength*2);
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hash = xmalloc(SHA_DIGEST_LEN*2+1);
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/* Copy the incoming random data and our public key to the buffer */
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hex2bin(challenge, buffer, keylength);
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BN_bn2bin(myself->metakey.n, buffer+keylength);
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/* Calculate the hash from that */
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SHA1(buffer, keylength*2, hash);
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free(buffer);
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/* Convert the hash to a hexadecimal formatted string */
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bin2hex(hash,hash,SHA_DIGEST_LEN);
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hash[SHA_DIGEST_LEN*2] = '\0';
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/* Send the reply */
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if(cl->status.outgoing)
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cl->allow_resuest = ID;
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else
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cl->allow_request = ACK;
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x = send_request(cl, "%d %s", CHAL_REPLY, hash);
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free(hash);
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cp
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return x;
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}
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int chal_reply_h(conn_list_t *cl)
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{
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char *hash;
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cp
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if(sscanf(cl->buffer, "%*d %as", &cl->id, &hash) != 2)
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{
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syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->id, cl->hostname);
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return -1;
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}
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/* Check if the length of the hash is all right */
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if(strlen(hash) != SHA_DIGEST_LEN*2)
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{
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syslog(LOG_ERROR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->id, cl->hostname);
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return -1;
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}
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/* Convert the hash to binary format */
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hex2bin(hash, hash, SHA_DIGEST_LEN);
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/* Verify the incoming hash with the calculated hash */
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if{!memcmp(hash, cl->chal_hash, SHA_DIGEST_LEN)}
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{
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syslog(LOG_ERROR, _("Intruder: wrong challenge reply from %s (%s)"), cl->id, cl->hostname);
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return -1;
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}
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/* Identity has now been positively verified.
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If we are accepting this new connection, then send our identity,
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if we are making this connecting, acknowledge.
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*/
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free(hash);
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free(cl->chal_hash);
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cp
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if(cl->status.outgoing)
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{
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cl->allow_request = ACK;
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return send_ack(cl);
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}
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else
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{
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cl->allow_request = CHALLENGE;
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return send_id(cl);
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}
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}
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int send_ack(conn_list_t *cl)
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{
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cp
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if(debug_lvl > 1)
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syslog(LOG_DEBUG, _("Sending ACK to %s (%s)"),
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cl->vpn_hostname, cl->real_hostname);
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buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", ACK);
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if((write(cl->meta_socket, buffer, buflen)) < 0)
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{
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syslog(LOG_ERR, _("Send failed: %d:%d: %m"), __FILE__, __LINE__);
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return -1;
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}
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cp
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return 0;
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return send_request(cl, "%d", ACK);
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}
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int ack_h(conn_list_t *cl)
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{
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cp
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/* Okay, before we active the connection, we check if there is another entry
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in the connection list with the same vpn_ip. If so, it presumably is an
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old connection that has timed out but we don't know it yet.
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*/
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while((old = lookup_conn(cl->vpn_ip)))
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{
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if(debug_lvl > 1)
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syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
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cl->vpn_hostname, old->real_hostname, cl->real_hostname);
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old->status.active = 0;
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terminate_connection(old);
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}
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/* Activate this connection */
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cl->allow_request = ALL;
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cl->status.active = 1;
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if(debug_lvl > DEBUG_CONNECTIONS)
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syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->id, cl->hostname);
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/* Exchange information about other tinc daemons */
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notify_others(cl, NULL, send_add_host);
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notify_one(cl);
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upstreamindex = 0;
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cp
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if(cl->status.outgoing)
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return 0;
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else
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return send_ack(cl);
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}
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/* Address and subnet information exchange */
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/* New and closed connections notification */
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/* Status and error notification routines */
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int send_status(conn_list_t *cl, int statusno, char *statusstring)
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{
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cp
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return send_request(cl, "%d %d %s", STATUS, statusno, statusstring);
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}
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int send_error(conn_list_t *cl, int errno, char *errstring)
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{
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cp
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return send_request(cl, "%d %d %s", ERROR, errno, errstring);
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}
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/* Old routines */
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int send_termreq(conn_list_t *cl)
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{
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cp
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@ -122,7 +452,6 @@ cp
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return 0;
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}
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/* Evil hack - TCP tunneling is bad */
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int send_tcppacket(conn_list_t *cl, void *data, int len)
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{
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cp
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@ -250,78 +579,6 @@ cp
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cp
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}
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int send_basic_info(conn_list_t *cl)
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{
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cp
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if(debug_lvl > 1)
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syslog(LOG_DEBUG, _("Sending BASIC_INFO to %s"),
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cl->real_hostname);
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buflen = snprintf(buffer, MAXBUFSIZE, "%d %d %lx/%lx:%x %d\n", BASIC_INFO, PROT_CURRENT, myself->vpn_ip, myself->vpn_mask, myself->port, myself->flags);
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if((write(cl->meta_socket, buffer, buflen)) < 0)
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{
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syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
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return -1;
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}
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cp
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return 0;
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}
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int send_passphrase(conn_list_t *cl)
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{
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passphrase_t tmp;
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cp
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encrypt_passphrase(&tmp);
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if(debug_lvl > 1)
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syslog(LOG_DEBUG, _("Sending PASSPHRASE to %s (%s)"),
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cl->vpn_hostname, cl->real_hostname);
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buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PASSPHRASE, tmp.phrase);
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if((write(cl->meta_socket, buffer, buflen)) < 0)
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{
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syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
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return -1;
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}
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cp
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return 0;
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}
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int send_public_key(conn_list_t *cl)
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{
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cp
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if(debug_lvl > 1)
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syslog(LOG_DEBUG, _("Sending PUBLIC_KEY to %s (%s)"),
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cl->vpn_hostname, cl->real_hostname);
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buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PUBLIC_KEY, my_public_key_base36);
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if((write(cl->meta_socket, buffer, buflen)) < 0)
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{
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syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
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return -1;
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}
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cp
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return 0;
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}
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/* WDN doet deze functie? (GS)
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int send_calculate(conn_list_t *cl, char *k)
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{
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cp
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buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", CALCULATE, k);
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if((write(cl->meta_socket, buffer, buflen)) < 0)
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{
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syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__);
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return -1;
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}
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cp
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return 0;
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}
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*/
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int send_key_request(ip_t to)
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{
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@ -416,164 +673,6 @@ cp
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The incoming request handlers
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*/
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int basic_info_h(conn_list_t *cl)
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{
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conn_list_t *old;
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cp
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if(debug_lvl > 1)
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syslog(LOG_DEBUG, _("Got BASIC_INFO from %s"), cl->real_hostname);
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if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx %d", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port, &cl->flags) != 5)
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{
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syslog(LOG_ERR, _("Got bad BASIC_INFO from %s"),
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cl->real_hostname);
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return -1;
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}
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cl->vpn_hostname = hostlookup(htonl(cl->vpn_ip));
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if(cl->protocol_version != PROT_CURRENT)
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{
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syslog(LOG_ERR, _("Peer uses incompatible protocol version %d"),
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cl->protocol_version);
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return -1;
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}
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|
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if(cl->status.outgoing)
|
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{
|
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/* First check if the host we connected to is already in our
|
||||
connection list. If so, we are probably making a loop, which
|
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is not desirable.
|
||||
*/
|
||||
|
||||
if((old=lookup_conn(cl->vpn_ip)))
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{
|
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if(debug_lvl>0)
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syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"),
|
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cl->vpn_hostname, cl->real_hostname);
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cl->status.outgoing = 0;
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old->status.outgoing = 1;
|
||||
terminate_connection(cl);
|
||||
return 0;
|
||||
}
|
||||
|
||||
if(setup_vpn_connection(cl) < 0)
|
||||
return -1;
|
||||
send_basic_info(cl);
|
||||
}
|
||||
else
|
||||
{
|
||||
|
||||
if(setup_vpn_connection(cl) < 0)
|
||||
return -1;
|
||||
send_passphrase(cl);
|
||||
}
|
||||
cp
|
||||
return 0;
|
||||
}
|
||||
|
||||
int passphrase_h(conn_list_t *cl)
|
||||
{
|
||||
cp
|
||||
cl->pp = xmalloc(sizeof(*(cl->pp)));
|
||||
|
||||
if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad PASSPHRASE from %s (%s)"),
|
||||
cl->vpn_hostname, cl->real_hostname);
|
||||
return -1;
|
||||
}
|
||||
cl->pp->len = strlen(cl->pp->phrase);
|
||||
|
||||
if(debug_lvl > 1)
|
||||
syslog(LOG_DEBUG, _("Got PASSPHRASE from %s (%s)"),
|
||||
cl->vpn_hostname, cl->real_hostname);
|
||||
|
||||
if(cl->status.outgoing)
|
||||
send_passphrase(cl);
|
||||
else
|
||||
send_public_key(cl);
|
||||
cp
|
||||
return 0;
|
||||
}
|
||||
|
||||
int public_key_h(conn_list_t *cl)
|
||||
{
|
||||
char *g_n;
|
||||
conn_list_t *old;
|
||||
cp
|
||||
if(sscanf(cl->buffer, "%*d %as", &g_n) != 1)
|
||||
{
|
||||
syslog(LOG_ERR, _("Got bad PUBLIC_KEY from %s (%s)"),
|
||||
cl->vpn_hostname, cl->real_hostname);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if(debug_lvl > 1)
|
||||
syslog(LOG_DEBUG, _("Got PUBLIC_KEY from %s (%s)"),
|
||||
cl->vpn_hostname, cl->real_hostname);
|
||||
|
||||
if(verify_passphrase(cl, g_n))
|
||||
{
|
||||
/* intruder! */
|
||||
syslog(LOG_ERR, _("Intruder from %s: passphrase for %s does not match!"),
|
||||
cl->real_hostname, cl->vpn_hostname);
|
||||
return -1;
|
||||
}
|
||||
|
||||
if(cl->status.outgoing)
|
||||
send_public_key(cl);
|
||||
else
|
||||
{
|
||||
send_ack(cl);
|
||||
|
||||
/* Okay, before we active the connection, we check if there is another entry
|
||||
in the connection list with the same vpn_ip. If so, it presumably is an
|
||||
old connection that has timed out but we don't know it yet.
|
||||
*/
|
||||
|
||||
while((old = lookup_conn(cl->vpn_ip)))
|
||||
{
|
||||
if(debug_lvl > 1)
|
||||
syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
|
||||
cl->vpn_hostname, old->real_hostname, cl->real_hostname);
|
||||
old->status.active = 0;
|
||||
terminate_connection(old);
|
||||
}
|
||||
|
||||
cl->status.active = 1;
|
||||
|
||||
if(debug_lvl > 0)
|
||||
syslog(LOG_NOTICE, _("Connection with %s (%s) activated"),
|
||||
cl->vpn_hostname, cl->real_hostname);
|
||||
|
||||
notify_others(cl, NULL, send_add_host);
|
||||
notify_one(cl);
|
||||
}
|
||||
cp
|
||||
return 0;
|
||||
}
|
||||
|
||||
int ack_h(conn_list_t *cl)
|
||||
{
|
||||
cp
|
||||
if(debug_lvl > 1)
|
||||
syslog(LOG_DEBUG, _("Got ACK from %s (%s)"),
|
||||
cl->vpn_hostname, cl->real_hostname);
|
||||
|
||||
cl->status.active = 1;
|
||||
|
||||
if(debug_lvl > 0)
|
||||
syslog(LOG_NOTICE, _("Connection with %s (%s) activated"),
|
||||
cl->vpn_hostname, cl->real_hostname);
|
||||
|
||||
notify_others(cl, NULL, send_add_host);
|
||||
notify_one(cl);
|
||||
|
||||
upstreamindex = 0;
|
||||
cp
|
||||
return 0;
|
||||
}
|
||||
|
||||
int termreq_h(conn_list_t *cl)
|
||||
{
|
||||
|
|
@ -1013,31 +1112,14 @@ cp
|
|||
return 0;
|
||||
}
|
||||
|
||||
int (*request_handlers[256])(conn_list_t*) = {
|
||||
0, ack_h, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
termreq_h, timeout_h, del_host_h, 0, 0, 0, 0, 0, 0, 0,
|
||||
ping_h, pong_h, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
add_host_h, basic_info_h, passphrase_h, public_key_h, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
tcppacket_h, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
req_key_h, ans_key_h, key_changed_h, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
||||
0, 0, 0, 0, 0, 0
|
||||
/* "Complete overhaul". */
|
||||
|
||||
int (*request_handlers[6])(conn_list_t*) = {
|
||||
id_h, challenge_h, chal_reply_h, ack_h,
|
||||
status_h, error_h,
|
||||
};
|
||||
|
||||
char (*request_name[6]) = {
|
||||
"ID", "CHALLENGE", "CHAL_REPLY", "ACK",
|
||||
"STATUS", "ERROR",
|
||||
};
|
||||
|
|
|
|||
Loading…
Reference in a new issue