- {
- bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
- hishash[SHA_DIGEST_LENGTH*2] = '\0';
- syslog(LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
- }
- return -1;
- }
-
- /* Identity has now been positively verified.
- ack_h() handles the rest from now on.
- */
-cp
- return ack_h(cl);
-}
-
-int send_metakey(connection_t *cl)
-{
- char *buffer;
- int len, x;
-cp
- len = RSA_size(cl->rsa_key);
-
- /* Allocate buffers for the meta key */
-
- buffer = xmalloc(len*2+1);
-
- if(!cl->cipher_outkey)
- cl->cipher_outkey = xmalloc(len);
-
- if(!cl->cipher_outctx)
- cl->cipher_outctx = xmalloc(sizeof(*cl->cipher_outctx));
-cp
- /* Copy random data to the buffer */
-
- RAND_bytes(cl->cipher_outkey, len);
-
- cl->cipher_outkey[0] &= 0x7F; /* FIXME: Somehow if the first byte is more than 0xD0 or something like that, decryption fails... */
-
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- {
- bin2hex(cl->cipher_outkey, buffer, len);
- buffer[len*2] = '\0';
- syslog(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), buffer);
- }
-
- /* Encrypt the random data */
-
- if(RSA_public_encrypt(len, cl->cipher_outkey, buffer, cl->rsa_key, RSA_NO_PADDING) != len) /* NO_PADDING because the message size equals the RSA key size and it is totally random */
- {
- syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), cl->name, cl->hostname);
- free(buffer);
- return -1;
- }
-cp
- /* Convert the encrypted random data to a hexadecimal formatted string */
-
- bin2hex(buffer, buffer, len);
- buffer[len*2] = '\0';
-
- /* Send the meta key */
-
- x = send_request(cl, "%d %s", METAKEY, buffer);
- free(buffer);
-
- /* Further outgoing requests are encrypted with the key we just generated */
-
- EVP_EncryptInit(cl->cipher_outctx, EVP_bf_cfb(), cl->cipher_outkey, cl->cipher_outkey + EVP_bf_cfb()->key_len);
-
- cl->status.encryptout = 1;
-cp
- return x;
-}
-
-int metakey_h(connection_t *cl)
-{
- char buffer[MAX_STRING_SIZE];
- int len;
-cp
- if(sscanf(cl->buffer, "%*d "MAX_STRING, buffer) != 1)
- {
- syslog(LOG_ERR, _("Got bad METAKEY from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- len = RSA_size(myself->rsa_key);
-
- /* Check if the length of the meta key is all right */
-
- if(strlen(buffer) != len*2)
- {
- syslog(LOG_ERR, _("Intruder: wrong meta key length from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Allocate buffers for the meta key */
-
- if(!cl->cipher_inkey)
- cl->cipher_inkey = xmalloc(len);
-
- if(!cl->cipher_inctx)
- cl->cipher_inctx = xmalloc(sizeof(*cl->cipher_inctx));
-
- /* Convert the challenge from hexadecimal back to binary */
-
- hex2bin(buffer,buffer,len);
-
- /* Decrypt the meta key */
-
- if(RSA_private_decrypt(len, buffer, cl->cipher_inkey, myself->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */
- {
- syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- if(debug_lvl >= DEBUG_SCARY_THINGS)
- {
- bin2hex(cl->cipher_inkey, buffer, len);
- buffer[len*2] = '\0';
- syslog(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer);
- }
-
- /* All incoming requests will now be encrypted. */
-
- EVP_DecryptInit(cl->cipher_inctx, EVP_bf_cfb(), cl->cipher_inkey, cl->cipher_inkey + EVP_bf_cfb()->key_len);
-
- cl->status.decryptin = 1;
-
- cl->allow_request = CHALLENGE;
-cp
- return send_challenge(cl);
-}
-
-int ack_h(connection_t *cl)
-{
- config_t const *cfg;
- connection_t *old, *p;
- subnet_t *subnet;
- avl_node_t *node, *node2;
-cp
- /* Okay, before we active the connection, we check if there is another entry
- in the connection list with the same name. If so, it presumably is an
- old connection that has timed out but we don't know it yet.
- */
-
- while((old = lookup_id(cl->name)))
- {
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
- cl->name, old->hostname, cl->hostname);
-
- terminate_connection(old);
- }
-
- /* Activate this connection */
-
- cl->allow_request = ALL;
- cl->status.active = 1;
- cl->nexthop = cl;
- cl->cipher_pkttype = EVP_bf_cbc();
- cl->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len;
-
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
-
-cp
- /* Check some options */
-
- if((cfg = get_config_val(cl->config, config_indirectdata)))
- {
- if(cfg->data.val == stupid_true)
- cl->options |= OPTION_INDIRECT;
- }
-
- if((cfg = get_config_val(cl->config, config_tcponly)))
- {
- if(cfg->data.val == stupid_true)
- cl->options |= OPTION_TCPONLY;
- }
-
- /* Send him our subnets */
-
- for(node = myself->subnet_tree->head; node; node = node->next)
- {
- subnet = (subnet_t *)node->data;
- send_add_subnet(cl, subnet);
- }
- /* And send him all the hosts and their subnets we know... */
-
- for(node = connection_tree->head; node; node = node->next)
- {
- p = (connection_t *)node->data;
-
- if(p != cl && p->status.active)
- {
- /* Notify others of this connection */
-
- if(p->status.meta)
- send_add_host(p, cl);
-
- /* Notify new connection of everything we know */
-
- send_add_host(cl, p);
-
- for(node2 = p->subnet_tree->head; node2; node2 = node2->next)
- {
- subnet = (subnet_t *)node2->data;
- send_add_subnet(cl, subnet);
- }
- }
- }
-cp
- return 0;
-}
-
-/* Address and subnet information exchange */
-
-int send_add_subnet(connection_t *cl, subnet_t *subnet)
-{
- int x;
- char *netstr;
- char *owner;
-cp
- if(cl->options & OPTION_INDIRECT)
- owner = myself->name;
- else
- owner = subnet->owner->name;
-
- x = send_request(cl, "%d %s %s", ADD_SUBNET,
- owner, netstr = net2str(subnet));
- free(netstr);
-cp
- return x;
-}
-
-int add_subnet_h(connection_t *cl)
-{
- char subnetstr[MAX_STRING_SIZE];
- char name[MAX_STRING_SIZE];
- connection_t *owner, *p;
- subnet_t *subnet;
- avl_node_t *node;
-cp
- if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2)
- {
- syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s)"), cl->name, cl->hostname);
- return -1;
- }
-
- /* Check if owner name is a valid */
-
- if(check_id(name))
- {
- syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
- return -1;