X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=9b30a8a6366199dce506e6aead9ab40eced3251f;hp=35b07882275865d3effaf9f54ac538f34ed3cfa0;hb=17bc5220c332fdd083fd47fc600010f85171adc7;hpb=5d0b3516d5e8a46ca2268bdb32657b72295501ec diff --git a/src/protocol.c b/src/protocol.c index 35b07882..9b30a8a6 100644 --- a/src/protocol.c +++ b/src/protocol.c @@ -1,7 +1,7 @@ /* - protocol.c -- handle the meta-protocol - Copyright (C) 1999,2000 Ivo Timmermans , - 2000 Guus Sliepen + protocol.c -- handle the meta-protocol, basic functions + Copyright (C) 1999-2001 Ivo Timmermans , + 2000,2001 Guus Sliepen This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -17,7 +17,7 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: protocol.c,v 1.28.4.33 2000/09/17 21:42:05 guus Exp $ + $Id: protocol.c,v 1.28.4.123 2002/02/27 22:37:54 guus Exp $ */ #include "config.h" @@ -27,22 +27,16 @@ #include #include #include -#include -#include #include +#include +#include #include -#include - -#include - -#include #include "conf.h" -#include "encr.h" -#include "net.h" -#include "netutl.h" #include "protocol.h" +#include "meta.h" +#include "connection.h" #include "system.h" @@ -51,969 +45,126 @@ int check_id(char *id) int i; for (i = 0; i < strlen(id); i++) - { - if(!isalpha(id[i]) && id[i] != '_') - { - return 0; - } - } - - return 1; + if(!isalnum(id[i]) && id[i] != '_') + return -1; + + return 0; } -/* Generic outgoing request routine - takes care of logging and error detection as well */ +/* Generic request routines - takes care of logging and error + detection as well */ -int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...) +int send_request(connection_t *c, const char *format, ...) { va_list args; - char buffer[MAXBUFSIZE+1]; - int len; + char buffer[MAXBUFSIZE]; + int len, request; cp - /* Use vsnprintf instead of vasprintf: faster, no memory fragmentation, cleanup is automatic, - and there is a limit on the input buffer anyway */ + /* Use vsnprintf instead of vasprintf: faster, no memory + fragmentation, cleanup is automatic, and there is a limit on the + input buffer anyway */ - va_start(args, request); - len = vsnprintf(buffer, MAXBUFSIZE+1, format, args); + va_start(args, format); + len = vsnprintf(buffer, MAXBUFSIZE, format, args); va_end(args); - if(len < 0 || len > MAXBUFSIZE) - { - syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname); - return -1; - } - - if(debug_lvl >= DEBUG_META) - syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], - cl->name, cl->hostname, buffer); - else if(debug_lvl >= DEBUG_PROTOCOL) - syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname); - - - if(cl->status.encryptin) - { - /* FIXME: Do encryption */ - } - - if((write(cl->meta_socket, buffer, len)) < 0) - { - syslog(LOG_ERR, _("Sending meta data failed: %m")); - return -1; - } -cp -} - -/* Connection protocol: - - Client Server - send_id(u) - send_challenge(R) - send_chal_reply(H) - send_id(u) - send_challenge(R) - send_chal_reply(H) - --------------------------------------- - Any negotations about the meta protocol - encryption go here(u). - --------------------------------------- - send_ack(u) - send_ack(u) - --------------------------------------- - Other requests(E)... - - (u) Unencrypted, - (R) RSA, - (H) SHA1, - (E) Encrypted with symmetric cipher. - - Part of the challenge is directly used to set the symmetric cipher key and the initial vector. - Since a man-in-the-middle cannot decrypt the RSA challenges, this means that he cannot get or - forge the key for the symmetric cipher. -*/ - -int send_id(conn_list_t *cl) -{ -cp - return send_request(cl, "%d %s %d %s", ID, - myself->name, myself->protocol_version, opt2str(myself->options)); -} - -int id_h(conn_list_t *cl) -{ - conn_list_t *old; - char *options; -cp - 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, _("Peer %s (%s) uses incompatible version %d"), - cl->name, cl->hostname, cl->protocol_version); - return -1; - } - - /* Check if option string is valid */ - - if((cl->options = str2opt(options)) == -1) - { - syslog(LOG_ERR, _("Peer %s uses invalid option string"), cl->hostname); - return -1; - } - - /* Check if identity is a valid name */ - - if(!check_id(cl->name)) - { - syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname); - return -1; - } - - /* Load information about peer */ - - if(!read_id(cl)) - { - syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name); - return -1; - } - - - /* 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) - { - 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 send_challenge(cl); -} - -int send_challenge(conn_list_t *cl) -{ - char *buffer; - int keylength; - int x; -cp - 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); - - /* Copy random data and the public key to the buffer */ - - RAND_bytes(buffer, keylength); - BN_bn2bin(cl->rsakey->length, buffer+keylength); - - /* If we don't have a blowfish key set yet, use the random data from the challenge to do so. */ - - if(!cl->status.encryptin) - { - 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 x; -} - -int challenge_h(conn_list_t *cl) -{ - char *challenge; - int x; - -cp - 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_chal_reply(conn_list_t *cl, char *challenge) -{ - char *buffer; - int keylength; - char *hash; - int x; - -cp - keylength = BN_num_bytes(myself->rsakey->length); - - /* Check if the length of the challenge is all right */ - - if(strlen(challenge) != keylength*2) - { - syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname); - return -1; - } - - /* Allocate buffers for the challenge and the hash */ - - buffer = xmalloc(keylength*2); - hash = xmalloc(SHA_DIGEST_LENGTH*2+1); - - /* Copy the incoming random data and our public key to the buffer */ - - hex2bin(challenge, buffer, keylength); - BN_bn2bin(myself->rsakey->length, buffer+keylength); - - /* 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) - { - set_metakey(cl, buffer, keylength); - cl->status.encrypted = 1; - } - - free(buffer); - - /* Convert the hash to a hexadecimal formatted string */ - - 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 x; -} - -int chal_reply_h(conn_list_t *cl) -{ - char *hash; -cp - 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; - } - - /* Check if the length of the hash is all right */ - - if(strlen(hash) != SHA_DIGEST_LENGTH*2) - { - syslog(LOG_ERR, _("Intruder: wrong challenge reply length from %s (%s)"), cl->name, cl->hostname); - return -1; - } - - /* 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, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname); - return -1; - } - - /* 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); - -cp - if(cl->status.outgoing) - { - cl->allow_request = ACK; - return send_ack(cl); - } - else - { - cl->allow_request = CHALLENGE; - return send_id(cl); - } -} - -int send_ack(conn_list_t *cl) -{ -cp - return send_request(cl, "%d", ACK); -} - -int ack_h(conn_list_t *cl) -{ - conn_list_t *old; - -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))) - { - 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); - } - - /* Activate this connection */ - - cl->allow_request = ALL; - cl->status.active = 1; - - 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; - -cp - if(cl->status.outgoing) - return 0; - else - return send_ack(cl); -} - -/* Address and subnet information exchange */ - -int send_add_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet) -{ -cp - return send_request(cl, "%d %s %s", ADD_SUBNET, - other->name, net2str(subnet)); -} - -int add_subnet_h(conn_list_t *cl) -{ - char *subnetstr; - char *name; - conn_list_t *owner; - subnet_t *subnet, *old; -cp - if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3) - { - 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; - } - - /* Check if subnet string is valid */ - - if((subnet = str2net(subnetstr)) == -1) - { - syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname); - return -1; - } - - /* Check if somebody tries to add a subnet of ourself */ - - if(!strcmp(name, myself->name)) + if(len < 0 || len > MAXBUFSIZE-1) { - syslog(LOG_ERR, _("Warning: got ADD_SUBNET from %s (%s) for ourself, restarting"), - cl->name, cl->hostname); - sighup = 1; - return 0; - } - - /* Check if the owner of the new subnet is in the connection list */ - - if(!(owner = lookup_id(name)) - { - syslog(LOG_NOTICE, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"), - name, cl->name, cl->hostname); - } - - -} - -int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet) -{ -cp - return send_request(cl, "%d %s %s", DEL_SUBNET, other->name, net2str(subnet)); -} - -int del_subnet_h(conn_list_t *cl) -{ - char *subnetstr; - char *name; - conn_list_t *owner; - subnet_t *subnet, *old; -cp - if(sscanf(cl->buffer, "%*d %as %as", &name, &subnetstr) != 3) - { - syslog(LOG_ERR, _("Got bad DEL_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 DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname); - return -1; - } - - /* Check if subnet string is valid */ - - if((subnet = str2net(subnetstr)) == -1) - { - syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname); + syslog(LOG_ERR, _("Output buffer overflow while sending request to %s (%s)"), request_name[request], c->name, c->hostname); return -1; } - /* Check if somebody tries to delete a subnet of ourself */ - - if(!strcmp(name, myself->name)) - { - syslog(LOG_ERR, _("Warning: got DEL_SUBNET from %s (%s) for ourself, restarting"), - cl->name, cl->hostname); - sighup = 1; - return 0; - } - - /* Check if the owner of the new subnet is in the connection list */ - - if(!(owner = lookup_id(name)) + if(debug_lvl >= DEBUG_PROTOCOL) { - syslog(LOG_NOTICE, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"), - name, cl->name, cl->hostname); + sscanf(buffer, "%d", &request); + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], c->name, c->hostname, buffer); + else + syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], c->name, c->hostname); } -} -/* New and closed connections notification */ - -int send_add_host(conn_list_t *cl, conn_list_t *other) -{ + buffer[len++] = '\n'; cp - return send_request(cl, "%d %s %lx:%d %s", ADD_HOST, other->name, other->real_ip, other->port, opt2str(other->options)); + return send_meta(c, buffer, len); } -int add_host_h(conn_list_t *cl) +int receive_request(connection_t *c) { - char *options; - conn_list_t *old, *new; + int request; cp - 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 ADD_HOST from %s (%s)"), cl->name, cl->hostname); - return -1; - } - - /* Check if option string is valid */ - - if((new->options = str2opt(options)) == -1) - { - syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid option string"), cl->name, cl->hostname); - return -1; - } - - /* Check if identity is a valid name */ - - if(!check_id(new->name)) - { - syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname); - return -1; - } - - /* Check if somebody tries to add ourself */ - - if(!strcmp(new->name, myself->name)) + if(sscanf(c->buffer, "%d", &request) == 1) { - syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), cl->name, cl->hostname); - sighup = 1; - return 0; - } - - /* Fill in more of the new conn_list structure */ - - new->hostname = hostlookup(htonl(new->real_ip)); - - /* Check if the new host already exists in the connnection list */ - - if((old = lookup_id(new->name))) - { - if((new->real_ip == old->real_ip) && (new->port == old->port)) + if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL)) { - 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; + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"), + c->name, c->hostname, c->buffer); + else + syslog(LOG_ERR, _("Unknown request from %s (%s)"), + c->name, c->hostname); + + return -1; } 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); - } - } - - /* 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 send_del_host(conn_list_t *cl, conn_list_t *other) -{ -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 %lx:%d", &id, &address, &port) != 3) - { - syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"), - cl->name, cl->hostname); - return -1; - } - - /* Check if somebody tries to delete ourself */ - - if(!strcmp(id, myself->name)) - { - syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"), - cl->name, cl->hostname); - sighup = 1; - return 0; - } - - /* Check if the new host already exists in the connnection list */ - - if((old = lookup_id(id))) - { - if((address == old->real_ip) && (port == old->port)) - { - notify_others(old, cl, send_del_host); - - old->status.termreq = 1; - old->status.active = 0; - - terminate_connection(old); -cp - return 0; - } - } - - 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; -} - -/* Status and error notification routines */ - -int send_status(conn_list_t *cl, int statusno, char *statusstring) -{ -cp - if(!statusstring) - statusstring = status_text[statusno]; -cp - return send_request(cl, "%d %d %s", STATUS, statusno, statusstring); -} - -int status_h(conn_list_t *cl) -{ - int statusno; - char *statusstring; -cp - if(sscanf(cl->buffer, "%*d %d %as", &statusno, &statusstring) != 2) - { - syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"), - cl->name, 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); - } - -cp - free(statusstring); - return 0; -} - -int send_error(conn_list_t *cl, int errno, char *errstring) -{ -cp - if(!errstring) - errstring = strerror(errno); - return send_request(cl, "%d %d %s", ERROR, errno, errstring); -} - -int error_h(conn_list_t *cl) -{ - int errno; - char *errorstring; -cp - if(sscanf(cl->buffer, "%*d %d %as", &errno, &errorstring) != 2) - { - syslog(LOG_ERR, _("Got bad error from %s (%s)"), - cl->name, cl->hostname); - return -1; - } - - if(debug_lvl > DEBUG_error) - { - syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"), - cl->name, cl->hostname, strerror(errno), errorstring); - } - - 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); -} - -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 - return send_pong(cl); -} - -int send_pong(conn_list_t *cl) -{ -cp - return send_request(cl, "%d", PONG); -} - -int pong_h(conn_list_t *cl) -{ -cp - cl->status.got_pong = 1; -cp - return 0; -} - -/* Key exchange */ - -int send_key_changed(conn_list_t *from, conn_list_t *cl) -{ - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - { - if(p!=cl && p->status.meta && p->status.active) - send_request(p, "%d %s", KEY_CHANGED, - from->name); - } -cp - return 0; -} - -int key_changed_h(conn_list_t *cl) -{ - char *from_id; - conn_list_t *from; -cp - if(sscanf(cl->buffer, "%*d %as", &from_id) != 1) - { - syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"), - cl->name, cl->hostname); - return -1; - } - - if(!(from = lookup_id(from_id))) - { - syslog(LOG_ERR, _("Got KEY_CHANGED from %s (%s) origin %s which does not exist in our connection list"), - cl->name, cl->hostname, from_id); - free(from_id); - return -1; - } - - free(from_id); - - from->status.validkey = 0; - from->status.waitingforkey = 0; - - 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->name, to->name); -} - -int req_key_h(conn_list_t *cl) -{ - char *from_id, *to_id; - conn_list_t *from, *to; -cp - if(sscanf(cl->buffer, "%*d %as %as", &from_id, &to_id) != 2) - { - syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"), - cl->name, 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->name, cl->hostname, from_id); - free(from_id); free(to_id); - return -1; - } - - /* Check if this key request is for us */ - - if(!strcmp(to_id, myself->name)) - { - send_ans_key(myself, from, myself->datakey->key); - } - else - { - if(!(to = lookup_id(to_id))) + if(debug_lvl >= DEBUG_PROTOCOL) + { + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"), + request_name[request], c->name, c->hostname, c->buffer); + else + syslog(LOG_DEBUG, _("Got %s from %s (%s)"), + request_name[request], c->name, c->hostname); + } + } + + if((c->allow_request != ALL) && (c->allow_request != request)) { - syslog(LOG_ERR, _("Got REQ_KEY from %s (%s) destination %s which does not exist in our connection list"), - cl->name, cl->hostname, to_id); - free(from_id); free(to_id); + syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname); return -1; } - send_req_key(from, to); - } - - free(from_id); free(to_id); -cp - return 0; -} - -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->name, to->name, datakey); -} - -int ans_key_h(conn_list_t *cl) -{ - char *from_id, *to_id, *datakey; - int keylength; - conn_list_t *from, *to; -cp - if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &datakey) != 3) - { - syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"), - cl->name, cl->hostname); - return -1; - } - - 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->name, cl->hostname, from_id); - free(from_id); free(to_id); free(datakey); - return -1; - } - - /* Check if this key request is for us */ - if(!strcmp(to_id, myself->name)) - { - /* It is for us, convert it to binary and set the key with it. */ - - keylength = strlen(datakey); - - if((keylength%2) || (keylength <= 0)) + if(request_handlers[request](c)) + /* Something went wrong. Probably scriptkiddies. Terminate. */ { - syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"), - cl->name, cl->hostname, from->name); - free(from_id); free(to_id); free(datakey); + syslog(LOG_ERR, _("Error while processing %s from %s (%s)"), + request_name[request], c->name, c->hostname); return -1; } - keylength /= 2; - hex2bin(datakey, datakey, keylength); - BF_set_key(cl->datakey, keylength, datakey); } else { - 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->name, cl->hostname, to_id); - free(from_id); free(to_id); free(datakey); - return -1; - } - send_ans_key(from, to, datakey); + syslog(LOG_ERR, _("Bogus data received from %s (%s)"), + c->name, c->hostname); + return -1; } - - free(from_id); free(to_id); free(datakey); -cp - return 0; -} - -/* Old routines */ - -/* - 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*)) -{ - 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; -} - -/* - Notify one connection of everything - I have connected -*/ - -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; } -/* "Complete overhaul". */ +/* Jumptable for the request handlers */ -int (*request_handlers[])(conn_list_t*) = { - id_h, challenge_h, chal_reply_h, ack_h, +int (*request_handlers[])(connection_t*) = { + id_h, metakey_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_node_h, del_node_h, add_subnet_h, del_subnet_h, + add_edge_h, del_edge_h, key_changed_h, req_key_h, ans_key_h, + tcppacket_h, }; +/* Request names */ + char (*request_name[]) = { - "ID", "CHALLENGE", "CHAL_REPLY", "ACK", + "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK", "STATUS", "ERROR", "TERMREQ", "PING", "PONG", - "ADD_HOST", "DEL_HOST", +// "ADD_NODE", "DEL_NODE", "ADD_SUBNET", "DEL_SUBNET", + "ADD_EDGE", "DEL_EDGE", "KEY_CHANGED", "REQ_KEY", "ANS_KEY", + "PACKET", };