along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol.c,v 1.28.4.1 2000/06/23 19:27:03 guus Exp $
+ $Id: protocol.c,v 1.28.4.31 2000/09/14 21:51:21 zarq Exp $
*/
#include "config.h"
#include <utils.h>
#include <xalloc.h>
+#include <netinet/in.h>
+
+#include <openssl/sha.h>
+
#include "conf.h"
#include "encr.h"
#include "net.h"
#include "system.h"
-char buffer[MAXBUFSIZE+1];
-int buflen;
+/* Generic outgoing request routine - takes care of logging and error detection as well */
-/* Outgoing request routines */
-
-int send_ack(conn_list_t *cl)
+int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...)
{
+ va_list args;
+ char *buffer = NULL;
+ int len;
+
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send ACK to %s"), cl->hostname);
+ if(debug_lvl >= DEBUG_PROTOCOL)
+ syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", ACK);
+ va_start(args, request);
+ len = vasprintf(&buffer, format, args);
+ va_end(args);
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(len < 0 || !buffer)
{
- syslog(LOG_ERR, _("send failed: %d:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Error during vasprintf(): %m"));
return -1;
}
- syslog(LOG_NOTICE, _("Connection with %s activated."), cl->hostname);
-cp
- return 0;
-}
-
-int send_termreq(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send TERMREQ to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
+ if(debug_lvl >= DEBUG_META)
+ syslog(LOG_DEBUG, _("Sending meta data to %s (%s): %s"),
+ cl->name, cl->hostname, buffer);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", TERMREQ, myself->vpn_ip);
+ if(cl->status.encryptin)
+ {
+ /* FIXME: Do encryption */
+ }
- if(write(cl->meta_socket, buffer, buflen) < 0)
+ if((write(cl->meta_socket, buffer, len)) < 0)
{
- if(debug_lvl > 1)
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Sending meta data failed: %m"));
return -1;
}
-cp
- return 0;
+cp
}
-int send_timeout(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send TIMEOUT to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
+/* Connection protocol:
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", PINGTIMEOUT, myself->vpn_ip);
+ Client Server
+ send_id(u)
+ send_challenge(R)
+ send_chal_reply(BH)
+ send_id(B)
+ send_challenge(BR)
+ send_chal_reply(BH)
+ send_ack(B)
+ send_ack(B)
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
+ (u) Unencrypted,
+ (R) RSA,
+ (H) SHA1,
+ (B) Blowfish.
+
+ Part of the challenge is directly used to set the blowfish key and the initial vector.
+ (Twee vliegen in één klap!)
+*/
+
+int send_id(conn_list_t *cl)
+{
cp
- return 0;
+ return send_request(cl, "%d %s %d %s", ID,
+ myself->name, myself->protocol_version, opt2str(myself->options));
}
-int send_del_host(conn_list_t *cl, conn_list_t *new_host)
+int id_h(conn_list_t *cl)
{
+ conn_list_t *old;
+ char *options;
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending delete host " IP_ADDR_S " to " IP_ADDR_S),
- IP_ADDR_V(new_host->vpn_ip), IP_ADDR_V(cl->vpn_ip));
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", DEL_HOST, new_host->vpn_ip);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(sscanf(cl->buffer, "%*d %as %d %as", &cl->name, &cl->protocol_version, &options) != 3)
+ {
+ syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
+ return -1;
+ }
+
+ /* Check if version matches */
+
+ if(cl->protocol_version != myself->protocol_version)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
+ cl->name, cl->hostname, cl->protocol_version);
return -1;
}
-cp
- return 0;
-}
-int send_ping(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("pinging " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PING);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ /* Check if option string is valid */
+
+ if((cl->options = str2opt(options)) == -1)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Peer %s uses invalid option string"), cl->hostname);
return -1;
}
-cp
- return 0;
-}
-
-int send_pong(conn_list_t *cl)
-{
-cp
- buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PONG);
-
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+
+ /* Check if identity is a valid name */
+
+ if(!check_id(cl->name))
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
return -1;
}
-cp
- return 0;
-}
-
-int send_add_host(conn_list_t *cl, conn_list_t *new_host)
-{
- ip_t real_ip;
- int flags;
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending add host to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
-
- real_ip = new_host->real_ip;
- flags = new_host->flags;
+
+ /* Load information about peer */
- /* If we need to propagate information about a new host that wants us to export
- * it's indirectdata flag, we set the INDIRECTDATA flag and unset the EXPORT...
- * flag, and set it's real_ip to our vpn_ip, so that net.c send_packet() will
- * work correctly.
- */
-
- if(flags & EXPORTINDIRECTDATA)
+ if(!read_id(cl))
{
- flags &= ~EXPORTINDIRECTDATA;
- flags |= INDIRECTDATA;
- real_ip = myself->vpn_ip;
+ syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name);
+ return -1;
}
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx/%lx:%x %d\n", ADD_HOST, new_host->real_ip, new_host->vpn_ip, new_host->vpn_mask, new_host->port, flags);
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ /* First check if the host we connected to is already in our
+ connection list. If so, we are probably making a loop, which
+ is not desirable.
+ */
+
+ if(cl->status.outgoing)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
+ if((old = lookup_id(cl->name)))
+ {
+ if(debug_lvl > DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), cl->name, cl->hostname);
+ cl->status.outgoing = 0;
+ old->status.outgoing = 1;
+ terminate_connection(cl);
+ return 0;
+ }
}
+
+ /* Send a challenge to verify the identity */
+
+ cl->allow_request = CHAL_REPLY;
cp
- return 0;
+ return send_challenge(cl);
}
-int send_key_changed(conn_list_t *cl, conn_list_t *src)
+int send_challenge(conn_list_t *cl)
{
+ char *buffer;
+ int keylength;
+ int x;
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending KEY_CHANGED to " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
+ if(cl->chal_answer)
+ free(cl->chal_answer);
+
+ /* Allocate buffers for the challenge and the hash */
+
+ cl->chal_answer = xmalloc(SHA_DIGEST_LENGTH);
+ keylength = BN_num_bytes(cl->rsakey->length);
+ buffer = xmalloc(keylength*2);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", KEY_CHANGED, src->vpn_ip);
+ /* Copy random data and the public key to the buffer */
+
+ RAND_bytes(buffer, keylength);
+ BN_bn2bin(cl->rsakey->length, buffer+keylength);
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ /* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */
+
+ if(!cl->status.encryptin)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
+ set_metakey(cl, buffer, keylength);
}
+
+ /* Calculate the hash from that */
+
+ SHA1(buffer, keylength*2, cl->chal_answer);
+
+ /* Convert the random data to a hexadecimal formatted string */
+
+ bin2hex(buffer,buffer,keylength);
+ buffer[keylength*2] = '\0';
+
+ /* Send the challenge */
+
+ cl->allow_request = CHAL_REPLY;
+ x = send_request(cl, "%d %s", CHALLENGE, buffer);
+ free(buffer);
+ cl->status.encryptout = 1;
cp
- return 0;
+ return x;
}
-void send_key_changed_all(void)
+int challenge_h(conn_list_t *cl)
{
- conn_list_t *p;
+ char *challenge;
+ int x;
+
cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p->status.meta && p->status.active)
- send_key_changed(p, myself);
+ if(sscanf(cl->buffer, "%*d %as", &cl->name, &challenge) != 1)
+ {
+ syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
+
+ /* Rest is done by send_chal_reply() */
+
+ x = send_chal_reply(cl, challenge);
+ free(challenge);
cp
+ return x;
}
-int send_basic_info(conn_list_t *cl)
+int send_chal_reply(conn_list_t *cl, char *challenge)
{
+ char *buffer;
+ int keylength;
+ char *hash;
+ int x;
+
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send BASIC_INFO to " IP_ADDR_S),
- IP_ADDR_V(cl->real_ip));
+ keylength = BN_num_bytes(myself->rsakey->length);
- 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);
+ /* Check if the length of the challenge is all right */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ if(strlen(challenge) != keylength*2)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname);
return -1;
}
-cp
- return 0;
-}
-int send_passphrase(conn_list_t *cl)
-{
- passphrase_t tmp;
-cp
- encrypt_passphrase(&tmp);
+ /* Allocate buffers for the challenge and the hash */
+
+ buffer = xmalloc(keylength*2);
+ hash = xmalloc(SHA_DIGEST_LENGTH*2+1);
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send PASSPHRASE %s to " IP_ADDR_S),
- tmp.phrase, IP_ADDR_V(cl->vpn_ip));
+ /* Copy the incoming random data and our public key to the buffer */
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PASSPHRASE, tmp.phrase);
+ hex2bin(challenge, buffer, keylength);
+ BN_bn2bin(myself->rsakey->length, buffer+keylength);
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ /* Calculate the hash from that */
+
+ SHA1(buffer, keylength*2, hash);
+
+ /* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */
+
+ if(!cl->status.encrypted)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
+ set_metakey(cl, buffer, keylength);
+ cl->status.encrypted = 1;
}
-cp
- return 0;
-}
-int send_public_key(conn_list_t *cl)
-{
-cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Send PUBLIC_KEY %s to " IP_ADDR_S),
- my_public_key_base36, IP_ADDR_V(cl->vpn_ip));
+ free(buffer);
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PUBLIC_KEY, my_public_key_base36);
+ /* Convert the hash to a hexadecimal formatted string */
- if((write(cl->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
+ bin2hex(hash,hash,SHA_DIGEST_LENGTH);
+ hash[SHA_DIGEST_LENGTH*2] = '\0';
+
+ /* Send the reply */
+
+ if(cl->status.outgoing)
+ cl->allow_request = ID;
+ else
+ cl->allow_request = ACK;
+
+ x = send_request(cl, "%d %s", CHAL_REPLY, hash);
+ free(hash);
cp
- return 0;
-}
+ return x;
+}
-int send_calculate(conn_list_t *cl, char *k)
+int chal_reply_h(conn_list_t *cl)
{
+ char *hash;
cp
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", CALCULATE, k);
+ if(sscanf(cl->buffer, "%*d %as", &cl->name, &hash) != 2)
+ {
+ syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
- if((write(cl->meta_socket, buffer, buflen)) < 0)
+ /* Check if the length of the hash is all right */
+
+ if(strlen(hash) != SHA_DIGEST_LENGTH*2)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
+ syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname);
return -1;
}
-cp
- return 0;
-}
-
-int send_key_request(ip_t to)
-{
- conn_list_t *fw;
-cp
- fw = lookup_conn(to);
- if(!fw)
+
+ /* Convert the hash to binary format */
+
+ hex2bin(hash, hash, SHA_DIGEST_LENGTH);
+
+ /* Verify the incoming hash with the calculated hash */
+
+ if(!memcmp(hash, cl->chal_answer, SHA_DIGEST_LENGTH))
{
- syslog(LOG_ERR, _("Attempting to send key request to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
+ syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending out request for public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
-
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx\n", REQ_KEY, to, myself->vpn_ip);
+ /* Identity has now been positively verified.
+ If we are accepting this new connection, then send our identity,
+ if we are making this connecting, acknowledge.
+ */
+
+ free(hash);
+ free(cl->chal_answer);
- if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0)
+cp
+ if(cl->status.outgoing)
{
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
+ cl->allow_request = ACK;
+ return send_ack(cl);
+ }
+ else
+ {
+ cl->allow_request = CHALLENGE;
+ return send_id(cl);
}
- fw->status.waitingforkey = 1;
-cp
- return 0;
}
-int send_key_answer(conn_list_t *cl, ip_t to)
+int send_ack(conn_list_t *cl)
{
- conn_list_t *fw;
cp
+ return send_request(cl, "%d", ACK);
+}
- fw = lookup_conn(to);
+int ack_h(conn_list_t *cl)
+{
+ conn_list_t *old;
- if(!fw)
+cp
+ /* 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_id(cl->name)))
{
- syslog(LOG_ERR, _("Attempting to send key answer to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
- return -1;
+ 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);
+ old->status.active = 0;
+ terminate_connection(old);
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Sending public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
+ /* Activate this connection */
+
+ cl->allow_request = ALL;
+ cl->status.active = 1;
- buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx %d %s\n", ANS_KEY, to, myself->vpn_ip, my_key_expiry, my_public_key_base36);
+ if(debug_lvl > DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
+
+ /* Exchange information about other tinc daemons */
+
+ notify_others(cl, NULL, send_add_host);
+ notify_one(cl);
+
+ upstreamindex = 0;
- if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0)
- {
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
cp
- return 0;
+ if(cl->status.outgoing)
+ return 0;
+ else
+ return send_ack(cl);
}
-/*
- notify all my direct connections of a new host
- that was added to the vpn, with the exception
- of the source of the announcement.
-*/
-int notify_others(conn_list_t *new, conn_list_t *source,
- int (*function)(conn_list_t*, conn_list_t*))
+/* Address and subnet information exchange */
+
+int send_add_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p != source && p->status.meta && p->status.active)
- function(p, new);
cp
- return 0;
+/* return send_request(cl, "%d %s %d %s", ADD_SUBNET,
+ other->name, subnet->type, net2str(subnet)); */
+ return send_request(cl, "%d %s %s", ADD_SUBNET,
+ other->name, net2str(subnet));
}
-/*
- notify one connection of everything
- i have connected
-*/
-int notify_one(conn_list_t *new)
+int add_subnet_h(conn_list_t *cl)
+{
+}
+
+int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
{
- conn_list_t *p;
-cp
- for(p = conn_list; p != NULL; p = p->next)
- if(p != new && p->status.active)
- send_add_host(new, p);
cp
- return 0;
+ return send_request(cl, "%d %s %s", DEL_SUBNET, other->name, net2str(subnet));
}
-/*
- The incoming request handlers
-*/
+int del_subnet_h(conn_list_t *cl)
+{
+}
+
+/* New and closed connections notification */
+
+int send_add_host(conn_list_t *cl, conn_list_t *other)
+{
+cp
+ return send_request(cl, "%d %s %lx:%d %s", ADD_HOST, other->name, other->real_ip, other->port, opt2str(other->options));
+}
-int basic_info_h(conn_list_t *cl)
+int add_host_h(conn_list_t *cl)
{
+ char *options;
+ conn_list_t *old, *new;
cp
- if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx %d", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port, &cl->flags) != 5)
+ new = new_conn_list();
+
+ if(sscanf(cl->buffer, "%*d %as %lx:%d %as", &new->name, &new->real_ip, &new->port, &options) != 4)
{
- syslog(LOG_ERR, _("got bad BASIC_INFO request: %s"), cl->buffer);
+ syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), cl->name, cl->hostname);
return -1;
}
- if(cl->protocol_version != PROT_CURRENT)
+ /* Check if option string is valid */
+
+ if((new->options = str2opt(options)) == -1)
{
- syslog(LOG_ERR, _("Peer uses incompatible protocol version %d."),
- cl->protocol_version);
+ syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid option string"), cl->name, cl->hostname);
return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got BASIC_INFO(%hd," IP_ADDR_S "," IP_ADDR_S ")"), cl->port,
- IP_ADDR_V(cl->vpn_ip), IP_ADDR_V(cl->vpn_mask));
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Peer uses protocol version %d"),
- cl->protocol_version);
-
- if(cl->status.outgoing)
+ /* Check if identity is a valid name */
+
+ if(!check_id(new->name))
{
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_basic_info(cl);
+ syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
+ return -1;
}
- else
+
+ /* Check if somebody tries to add ourself */
+
+ if(!strcmp(new->name, myself->name))
{
- if(setup_vpn_connection(cl) < 0)
- return -1;
- send_passphrase(cl);
+ syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), cl->name, cl->hostname);
+ sighup = 1;
+ return 0;
}
-cp
- return 0;
-}
-int passphrase_h(conn_list_t *cl)
-{
-cp
- cl->pp = xmalloc(sizeof(*(cl->pp)));
+ /* Fill in more of the new conn_list structure */
- if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1)
+ new->hostname = hostlookup(htonl(new->real_ip));
+
+ /* Check if the new host already exists in the connnection list */
+
+ if((old = lookup_id(new->name)))
{
- syslog(LOG_ERR, _("got bad PASSPHRASE request: %s"), cl->buffer);
- return -1;
+ if((new->real_ip == old->real_ip) && (new->port == old->port))
+ {
+ if(debug_lvl > DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
+ old->name, old->hostname, new->name, new->hostname);
+ return 0;
+ }
+ else
+ {
+ if(debug_lvl > DEBUG_CONNECTIONS)
+ syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"),
+ old->name, old->hostname);
+ old->status.active = 0;
+ terminate_connection(old);
+ }
}
- cl->pp->len = strlen(cl->pp->phrase);
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got PASSPHRASE"));
- if(cl->status.outgoing)
- send_passphrase(cl);
- else
- send_public_key(cl);
+ /* Fill in rest of conn_list structure */
+
+ new->nexthop = cl;
+ new->status.active = 1;
+
+ /* Hook it up into the conn_list */
+
+ conn_list_add(conn_list, new);
+
+ /* Tell the rest about the new host */
+
+ notify_others(new, cl, send_add_host);
+
cp
return 0;
}
-int public_key_h(conn_list_t *cl)
+int send_del_host(conn_list_t *cl, conn_list_t *other)
{
- char *g_n;
+cp
+ return send_request(cl, "%d %s %lx:%d", DEL_HOST,
+ other->name, other->real_ip, other->port);
+}
+
+int del_host_h(conn_list_t *cl)
+{
+ char *id;
+ ip_t address;
+ port_t port;
conn_list_t *old;
+
cp
- if(sscanf(cl->buffer, "%*d %as", &g_n) != 1)
+ if(sscanf(cl->buffer, "%*d %as %lx:%d", &id, &address, &port) != 3)
{
- syslog(LOG_ERR, _("got bad PUBLIC_KEY request: %s"), cl->buffer);
- return -1;
+ syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got PUBLIC_KEY %s"), g_n);
-
- if(verify_passphrase(cl, g_n))
+ /* Check if somebody tries to delete ourself */
+
+ if(!strcmp(id, myself->name))
{
- /* intruder! */
- syslog(LOG_ERR, _("Intruder: passphrase does not match."));
- return -1;
+ syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"),
+ cl->name, cl->hostname);
+ sighup = 1;
+ return 0;
}
- if(debug_lvl > 2)
- syslog(LOG_INFO, _("Passphrase OK"));
+ /* Check if the new host already exists in the connnection list */
- if(cl->status.outgoing)
- send_public_key(cl);
- else
+ if((old = lookup_id(id)))
{
- send_ack(cl);
+ if((address == old->real_ip) && (port == old->port))
+ {
+ notify_others(old, cl, send_del_host);
- /* 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. Because our
- conn_list entry is not active, lookup_conn will skip ourself. */
+ old->status.termreq = 1;
+ old->status.active = 0;
- while(old=lookup_conn(cl->vpn_ip))
- terminate_connection(old);
+ terminate_connection(old);
+cp
+ return 0;
+ }
+ }
- cl->status.active = 1;
- notify_others(cl, NULL, send_add_host);
- notify_one(cl);
+ if(debug_lvl > DEBUG_CONNECTIONS)
+ {
+ syslog(LOG_NOTICE, _("Got DEL_HOST for %s from %s (%s) which is not in our connection list"),
+ id, cl->name, cl->hostname);
}
cp
return 0;
}
-int ack_h(conn_list_t *cl)
+/* Status and error notification routines */
+
+int send_status(conn_list_t *cl, int statusno, char *statusstring)
{
cp
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got ACK"));
-
- cl->status.active = 1;
- syslog(LOG_NOTICE, _("Connection with %s activated."), cl->hostname);
+ if(!statusstring)
+ statusstring = status_text[statusno];
cp
- return 0;
+ return send_request(cl, "%d %d %s", STATUS, statusno, statusstring);
}
-int termreq_h(conn_list_t *cl)
+int status_h(conn_list_t *cl)
{
+ int statusno;
+ char *statusstring;
cp
- syslog(LOG_NOTICE, _(IP_ADDR_S " wants to quit"), IP_ADDR_V(cl->vpn_ip));
- cl->status.termreq = 1;
- terminate_connection(cl);
+ if(sscanf(cl->buffer, "%*d %d %as", &statusno, &statusstring) != 2)
+ {
+ syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"), cl->id, cl->hostname);
+ return -1;
+ }
+
+ if(debug_lvl > DEBUG_STATUS)
+ {
+ syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"),
+ cl->name, cl->hostname, status_text[statusno], statusstring);
+ }
- notify_others(cl, NULL, send_del_host);
cp
+ free(statusstring);
return 0;
}
-int timeout_h(conn_list_t *cl)
+int send_error(conn_list_t *cl, int errno, char *errstring)
{
cp
- if(!cl->status.active) return -1;
- syslog(LOG_NOTICE, _(IP_ADDR_S " says it's gotten a timeout from us"), IP_ADDR_V(cl->vpn_ip));
- cl->status.termreq = 1;
- terminate_connection(cl);
-cp
- return 0;
+ if(!errstring)
+ errstring = error_text[errno];
+ return send_request(cl, "%d %d %s", ERROR, errno, errstring);
}
-int del_host_h(conn_list_t *cl)
+int error_h(conn_list_t *cl)
{
- ip_t vpn_ip;
- conn_list_t *fw;
+ int errno;
+ char *errorstring;
cp
- if(!cl->status.active) return -1;
-
- if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1)
+ if(sscanf(cl->buffer, "%*d %d %as", &errno, &errorstring) != 2)
{
- syslog(LOG_ERR, _("got bad DEL_HOST request: %s"), cl->buffer);
+ syslog(LOG_ERR, _("Got bad error from %s (%s)"),
+ cl->name, cl->hostname);
return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got DEL_HOST for " IP_ADDR_S),
- IP_ADDR_V(vpn_ip));
+ }
- if(!(fw = lookup_conn(vpn_ip)))
+ if(debug_lvl > DEBUG_error)
{
- syslog(LOG_ERR, _("Somebody wanted to delete " IP_ADDR_S " which does not exist?"),
- IP_ADDR_V(vpn_ip));
- return 0;
+ syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"),
+ cl->name, cl->hostname, error_text[errno], errorstring);
}
- notify_others(cl, fw, send_del_host);
+ free(errorstring);
+ cl->status.termreq = 1;
+ terminate_connection(cl);
+cp
+ return 0;
+}
+
+int send_termreq(conn_list_t *cl)
+{
+cp
+ return send_request(cl, "%d", TERMREQ);
+}
- fw->status.termreq = 1;
- terminate_connection(fw);
+int termreq_h(conn_list_t *cl)
+{
+cp
+ cl->status.termreq = 1;
+ terminate_connection(cl);
cp
return 0;
}
+/* Keepalive routines - FIXME: needs a closer look */
+
+int send_ping(conn_list_t *cl)
+{
+ cl->status.pinged = 1;
+cp
+ return send_request(cl, "%d", PING);
+}
+
int ping_h(conn_list_t *cl)
{
cp
- if(!cl->status.active) return -1;
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("responding to ping from " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
- cl->status.pinged = 0;
- cl->status.got_pong = 1;
+ return send_pong(cl);
+}
- send_pong(cl);
+int send_pong(conn_list_t *cl)
+{
cp
- return 0;
+ return send_request(cl, "%d", PONG);
}
int pong_h(conn_list_t *cl)
{
cp
- if(!cl->status.active) return -1;
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("ok, got pong from " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
cl->status.got_pong = 1;
cp
return 0;
}
-int add_host_h(conn_list_t *cl)
+/* Key exchange */
+
+int send_key_changed(conn_list_t *from, conn_list_t *cl)
{
- ip_t real_ip;
- ip_t vpn_ip;
- ip_t vpn_mask;
- unsigned short port;
- int flags;
- conn_list_t *ncn, *fw;
+ conn_list_t *p;
cp
- if(!cl->status.active)
- return -1;
- if(sscanf(cl->buffer, "%*d %lx %lx/%lx:%hx %d", &real_ip, &vpn_ip, &vpn_mask, &port, &flags) != 5)
- {
- syslog(LOG_ERR, _("got bad ADD_HOST request: %s"), cl->buffer);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Add host request from " IP_ADDR_S), IP_ADDR_V(cl->vpn_ip));
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("got ADD_HOST(" IP_ADDR_S "," IP_ADDR_S ",%hd)"),
- IP_ADDR_V(vpn_ip), IP_ADDR_V(vpn_mask), port);
-
- /*
- Suggestion of Hans Bayle
- */
- if((fw = lookup_conn(vpn_ip)))
+ for(p = conn_list; p != NULL; p = p->next)
{
- if(fw->nexthop == cl)
- notify_others(fw, cl, send_add_host);
- else
- if(debug_lvl > 1)
- syslog(LOG_DEBUG, _("Invalid add_host request from " IP_ADDR_S),
- IP_ADDR_V(cl->vpn_ip));
- return 0;
+ if(p!=cl && p->status.meta && p->status.active)
+ send_request(p, "%d %s", KEY_CHANGED,
+ from->name);
}
-
- ncn = new_conn_list();
- ncn->real_ip = real_ip;
- ncn->vpn_ip = vpn_ip;
- ncn->vpn_mask = vpn_mask;
- ncn->port = port;
- ncn->flags = flags;
- ncn->hostname = hostlookup(real_ip);
- ncn->nexthop = cl;
- ncn->next = conn_list;
- conn_list = ncn;
- ncn->status.active = 1;
- notify_others(ncn, cl, send_add_host);
cp
return 0;
}
-int req_key_h(conn_list_t *cl)
+int key_changed_h(conn_list_t *cl)
{
- ip_t to;
- ip_t from;
- conn_list_t *fw;
+ char *from_id;
+ conn_list_t *from;
cp
- if(!cl->status.active) return -1;
- if(sscanf(cl->buffer, "%*d %lx %lx", &to, &from) != 2)
+ if(sscanf(cl->buffer, "%*d %as", &from_id) != 1)
{
- syslog(LOG_ERR, _("got bad request: %s"), cl->buffer);
- return -1;
+ syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"),
+ cl->name, cl->hostname);
+ return -1;
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got REQ_KEY from " IP_ADDR_S " for " IP_ADDR_S),
- IP_ADDR_V(from), IP_ADDR_V(to));
-
- if((to & myself->vpn_mask) == (myself->vpn_ip & myself->vpn_mask))
- { /* hey! they want something from ME! :) */
- send_key_answer(cl, from);
- return 0;
- }
-
- fw = lookup_conn(to);
-
- if(!fw)
+ if(!(from = lookup_id(from_id)))
{
- syslog(LOG_ERR, _("Attempting to forward key request to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
+ syslog(LOG_ERR, _("Got KEY_CHANGED from %s (%s) origin %s which does not exist in our connection list"), cl->id, cl->hostname, from_id);
+ free(from_id);
return -1;
}
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("Forwarding request for public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
-
- cl->buffer[cl->reqlen-1] = '\n';
+ free(from_id);
+
+ from->status.validkey = 0;
+ from->status.waitingforkey = 0;
- if(write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen) < 0)
- {
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
+ send_key_changed(from, cl);
cp
return 0;
}
+
+int send_req_key(conn_list_t *from, conn_list_t *to)
+{
+cp
+ return send_request(to->nexthop, "%d %s %s", REQ_KEY, from->id, to->id);
+}
-void set_keys(conn_list_t *cl, int expiry, char *key)
+int req_key_h(conn_list_t *cl)
{
- char *ek;
+ char *from_id, *to_id;
+ conn_list_t *from, *to;
cp
- if(!cl->public_key)
+ if(sscanf(cl->buffer, "%*d %as %as", &from_id, &to_id) != 2)
{
- cl->public_key = xmalloc(sizeof(*cl->key));
- cl->public_key->key = NULL;
+ syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"), cl->id, cl->hostname);
+ return -1;
+ }
+
+ if(!(from = lookup_id(from_id)))
+ {
+ syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) origin %s which does not exist in our connection list"), cl->id, cl->hostname, from_id);
+ free(from_id); free(to_id);
+ return -1;
}
-
- if(cl->public_key->key)
- free(cl->public_key->key);
- cl->public_key->length = strlen(key);
- cl->public_key->expiry = expiry;
- cl->public_key->key = xmalloc(cl->public_key->length + 1);
- strcpy(cl->public_key->key, key);
- ek = make_shared_key(key);
-
- if(!cl->key)
+ /* Check if this key request is for us */
+
+ if(!strcmp(id, myself->strcmp))
{
- cl->key = xmalloc(sizeof(*cl->key));
- cl->key->key = NULL;
+ send_ans_key(myself, from, myself->datakey);
+ }
+ else
+ {
+ if(!(to = lookup_id(to_id)))
+ {
+ syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) destination %s which does not exist in our connection list"), cl->id, cl->hostname, to_id);
+ free(from_id); free(to_id);
+ return -1;
+ }
+ send_req_key(from, to);
}
- if(cl->key->key)
- free(cl->key->key);
+ free(from_id); free(to_id);
+cp
+ return 0;
+}
- cl->key->length = strlen(ek);
- cl->key->expiry = expiry;
- cl->key->key = xmalloc(cl->key->length + 1);
- strcpy(cl->key->key, ek);
+int send_ans_key(conn_list_t *from, conn_list_t *to, char *datakey)
+{
cp
+ return send_request(to->nexthop, "%d %s %s %s", ANS_KEY, from->id, to->id, datakey);
}
int ans_key_h(conn_list_t *cl)
{
- ip_t to;
- ip_t from;
- int expiry;
- char *key;
- conn_list_t *fw, *gk;
+ char *from_id, *to_id, *datakey;
+ int keylength;
+ conn_list_t *from, *to;
cp
- if(!cl->status.active) return -1;
- if(sscanf(cl->buffer, "%*d %lx %lx %d %as", &to, &from, &expiry, &key) != 4)
+ if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &datakey) != 3)
{
- syslog(LOG_ERR, _("got bad ANS_KEY request: %s"), cl->buffer);
+ syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"), cl->id, cl->hostname);
return -1;
}
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("got ANS_KEY from " IP_ADDR_S " for " IP_ADDR_S),
- IP_ADDR_V(from), IP_ADDR_V(to));
+ if(!(from = lookup_id(from_id)))
+ {
+ syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) origin %s which does not exist in our connection list"), cl->id, cl->hostname, from_id);
+ free(from_id); free(to_id); free(datakey);
+ return -1;
+ }
- if(to == myself->vpn_ip)
- { /* hey! that key's for ME! :) */
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Yeah! key arrived. Now do something with it."));
- gk = lookup_conn(from);
+ /* Check if this key request is for us */
- if(!gk)
+ if(!strcmp(id, myself->strcmp))
+ {
+ /* It is for us, convert it to binary and set the key with it. */
+
+ keylength = strlen(datakey);
+
+ if((keylength%2) || (keylength <= 0))
{
- syslog(LOG_ERR, _("Receiving key from " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(from));
+ syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"), cl->id, cl->hostname, from->id);
+ free(from_id); free(to_id); free(datakey);
return -1;
}
-
- set_keys(gk, expiry, key);
- gk->status.validkey = 1;
- gk->status.waitingforkey = 0;
- flush_queues(gk);
- return 0;
+ keylength /= 2;
+ hex2bin(datakey, datakey, keylength);
+ BF_set_key(cl->datakey, keylength, datakey);
}
-
- fw = lookup_conn(to);
-
- if(!fw)
+ else
{
- syslog(LOG_ERR, _("Attempting to forward key to " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(to));
- return -1;
+ if(!(to = lookup_id(to_id)))
+ {
+ syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) destination %s which does not exist in our connection list"), cl->id, cl->hostname, to_id);
+ free(from_id); free(to_id); free(datakey);
+ return -1;
+ }
+ send_ans_key(from, to, datakey);
}
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("Forwarding public key to " IP_ADDR_S),
- IP_ADDR_V(fw->nexthop->vpn_ip));
-
- cl->buffer[cl->reqlen-1] = '\n';
-
- if((write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen)) < 0)
- {
- syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__);
- return -1;
- }
+ free(from_id); free(to_id); free(datakey);
cp
return 0;
}
-int key_changed_h(conn_list_t *cl)
-{
- ip_t from;
- conn_list_t *ik;
-cp
- if(!cl->status.active) return -1;
- if(sscanf(cl->buffer, "%*d %lx", &from) != 1)
- {
- syslog(LOG_ERR, _("got bad ANS_KEY request: %s"), cl->buffer);
- return -1;
- }
-
- if(debug_lvl > 2)
- syslog(LOG_DEBUG, _("got KEY_CHANGED from " IP_ADDR_S),
- IP_ADDR_V(from));
+/* Old routines */
- ik = lookup_conn(from);
-
- if(!ik)
- {
- syslog(LOG_ERR, _("Got changed key from " IP_ADDR_S ", which does not exist?"),
- IP_ADDR_V(from));
- return -1;
- }
+/*
+ Notify all my direct connections of a new host
+ that was added to the vpn, with the exception
+ of the source of the announcement.
+*/
- ik->status.validkey = 0;
- ik->status.waitingforkey = 0;
+int notify_others(conn_list_t *new, conn_list_t *source,
+ int (*function)(conn_list_t*, conn_list_t*))
+{
+ conn_list_t *p;
+cp
+ for(p = conn_list; p != NULL; p = p->next)
+ if(p != new && p != source && p->status.meta && p->status.active)
+ function(p, new);
+cp
+ return 0;
+}
- if(debug_lvl > 3)
- syslog(LOG_DEBUG, _("Forwarding key invalidation request"));
+/*
+ Notify one connection of everything
+ I have connected
+*/
- notify_others(cl, ik, send_key_changed);
+int notify_one(conn_list_t *new)
+{
+ conn_list_t *p;
+cp
+ for(p = conn_list; p != NULL; p = p->next)
+ if(p != new && p->status.active)
+ send_add_host(new, p);
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,
- 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,
- 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[])(conn_list_t*) = {
+ id_h, challenge_h, chal_reply_h, ack_h,
+ status_h, error_h, termreq_h,
+ ping_h, pong_h,
+ add_host_h, del_host_h,
+ add_subnet_h, del_subnet_h,
+ key_changed_h, req_key_h, ans_key_h,
+};
+
+char (*request_name[]) = {
+ "ID", "CHALLENGE", "CHAL_REPLY", "ACK",
+ "STATUS", "ERROR", "TERMREQ",
+ "PING", "PONG",
+ "ADD_HOST", "DEL_HOST",
+ "ADD_SUBNET", "DEL_SUBNET",
+ "KEY_CHANGED", "REQ_KEY", "ANS_KEY",
};
projects / tinc / blobdiff