X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=e9ee9665de3cdd39a600d40f2028c2ea89709a8e;hp=70122c1be7bfeb9e6d62bca7f76e942487be713f;hb=24a2c7e51a0b080c4bdb55f697b3f0458ebc3fb1;hpb=4faed1b8546563def6a426c563cec2a26d927eda diff --git a/src/protocol.c b/src/protocol.c index 70122c1b..e9ee9665 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 + 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 1.28.4.10 2000/06/27 12:58:04 guus Exp $ + $Id: protocol.c,v 1.28.4.106 2001/09/24 14:12:00 guus Exp $ */ #include "config.h" @@ -30,899 +30,1293 @@ #include #include #include +#include +#include #include #include +#include +#include + +#include + +#include +#include +#include + +#ifndef HAVE_RAND_PSEUDO_BYTES +#define RAND_pseudo_bytes RAND_bytes +#endif #include "conf.h" -#include "encr.h" #include "net.h" #include "netutl.h" #include "protocol.h" +#include "meta.h" +#include "connection.h" #include "system.h" -char buffer[MAXBUFSIZE+1]; -int buflen; +int mykeyused = 0; + +int check_id(char *id) +{ + int i; + + for (i = 0; i < strlen(id); i++) + if(!isalnum(id[i]) && id[i] != '_') + return -1; + + return 0; +} -/* Outgoing request routines */ +/* Generic request routines - takes care of logging and error + detection as well */ -int send_ack(conn_list_t *cl) +int send_request(connection_t *cl, const char *format, ...) { + va_list args; + char buffer[MAXBUFSIZE]; + int len, request; + cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ACK to " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + /* Use vsnprintf instead of vasprintf: faster, no memory + fragmentation, cleanup is automatic, and there is a limit on the + input buffer anyway */ - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", ACK); + va_start(args, format); + len = vsnprintf(buffer, MAXBUFSIZE, format, args); + request = va_arg(args, int); + va_end(args); - if((write(cl->meta_socket, buffer, buflen)) < 0) + if(len < 0 || len > MAXBUFSIZE-1) { - syslog(LOG_ERR, _("Send failed: %d:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname); return -1; } - if(debug_lvl > 0) - syslog(LOG_NOTICE, _("Connection with " IP_ADDR_S " (%s) activated"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + if(debug_lvl >= DEBUG_PROTOCOL) + { + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Sending %s to %s (%s): %s"), request_name[request], cl->name, cl->hostname, buffer); + else + syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname); + } + + buffer[len++] = '\n'; cp - return 0; + return send_meta(cl, buffer, len); } -int send_termreq(conn_list_t *cl) +int receive_request(connection_t *cl) { + int request; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending TERMREQ to " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", TERMREQ, myself->vpn_ip); + if(sscanf(cl->buffer, "%d", &request) == 1) + { + if((request < 0) || (request >= LAST) || (request_handlers[request] == NULL)) + { + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Unknown request from %s (%s): %s"), + cl->name, cl->hostname, cl->buffer); + else + syslog(LOG_ERR, _("Unknown request from %s (%s)"), + cl->name, cl->hostname); + + return -1; + } + else + { + if(debug_lvl >= DEBUG_PROTOCOL) + { + if(debug_lvl >= DEBUG_META) + syslog(LOG_DEBUG, _("Got %s from %s (%s): %s"), + request_name[request], cl->name, cl->hostname, cl->buffer); + else + syslog(LOG_DEBUG, _("Got %s from %s (%s)"), + request_name[request], cl->name, cl->hostname); + } + } + + if((cl->allow_request != ALL) && (cl->allow_request != request)) + { + syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), cl->name, cl->hostname); + return -1; + } - if(write(cl->meta_socket, buffer, buflen) < 0) + if(request_handlers[request](cl)) + /* Something went wrong. Probably scriptkiddies. Terminate. */ + { + syslog(LOG_ERR, _("Error while processing %s from %s (%s)"), + request_name[request], cl->name, cl->hostname); + return -1; + } + } + else { - if(debug_lvl > 1) - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Bogus data received from %s (%s)"), + cl->name, cl->hostname); return -1; } cp return 0; } -int send_timeout(conn_list_t *cl) +/* The authentication protocol is described in detail in doc/SECURITY2, + the rest will be described in doc/PROTOCOL. */ + +int send_id(connection_t *cl) +{ +cp + return send_request(cl, "%d %s %d %lx %hd", ID, myself->name, myself->protocol_version, myself->options, myself->port); +} + +int id_h(connection_t *cl) { + char name[MAX_STRING_SIZE]; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending TIMEOUT to " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + if(sscanf(cl->buffer, "%*d "MAX_STRING" %d %lx %hd", name, &cl->protocol_version, &cl->options, &cl->port) != 4) + { + syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname); + return -1; + } - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", PINGTIMEOUT, myself->vpn_ip); + /* Check if version matches */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + 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_del_host(conn_list_t *cl, conn_list_t *new_host) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending DEL_HOST for " IP_ADDR_S " to " IP_ADDR_S " (%s)"), - IP_ADDR_V(new_host->vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname); + /* Check if identity is a valid name */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname); + return -1; + } + + /* Copy string to cl */ + + if(cl->name) + free(cl->name); + + cl->name = xstrdup(name); - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", DEL_HOST, new_host->vpn_ip); + /* Load information about peer */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + if(read_host_config(cl)) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name); return -1; } + + /* Read in the public key, so that we can send a metakey */ + + if(read_rsa_public_key(cl)) + return -1; + + cl->allow_request = METAKEY; cp - return 0; + return send_metakey(cl); } -int send_ping(conn_list_t *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. + */ + + if((old = lookup_id(cl->name))) + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Removing old connection for %s at %s in favour of new connection at %s"), + old->name, old->hostname, cl->hostname); + if(old->status.outgoing) + { + cl->status.outgoing = 1; + old->status.outgoing = 0; + } + terminate_connection(old, 0); + return 0; + } + + /* Also check if no other tinc daemon uses the same IP and port for UDP traffic */ + + old = avl_search(active_tree, cl); + if(old) + { + syslog(LOG_ERR, _("%s is listening on %s:%hd, which is already in use by %s!"), + cl->name, cl->hostname, cl->port, old->name); + return -1; + } + + /* Activate this connection */ + + cl->allow_request = ALL; + cl->nexthop = cl; + cl->lastbutonehop = myself; + cl->cipher_pkttype = EVP_bf_cbc(); + cl->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len; + + active_add(cl); + + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname); + + if(cl->status.outgoing) + seconds_till_retry = 5; /* Reset retry timeout */ cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PING to " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + /* 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; + } - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PING); + /* Send him our subnets */ + + for(node = myself->subnet_tree->head; node; node = node->next) + { + subnet = (subnet_t *)node->data; + send_add_subnet(cl, subnet); + } - if((write(cl->meta_socket, buffer, buflen)) < 0) + /* And send him all the hosts and their subnets we know... */ + + for(node = active_tree->head; node; node = node->next) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; + p = (connection_t *)node->data; + + if(p != cl) + { + /* 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; } -int send_pong(conn_list_t *cl) +int send_challenge(connection_t *cl) { + char *buffer; + int len, x; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PONG to " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + /* CHECKME: what is most reasonable value for len? */ - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PONG); + len = RSA_size(cl->rsa_key); - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } + /* Allocate buffers for the challenge */ + + buffer = xmalloc(len*2+1); + + if(cl->hischallenge) + free(cl->hischallenge); + + cl->hischallenge = xmalloc(len); cp - return 0; + /* Copy random data to the buffer */ + + RAND_bytes(cl->hischallenge, len); + +cp + /* Convert to hex */ + + bin2hex(cl->hischallenge, buffer, len); + buffer[len*2] = '\0'; + +cp + /* Send the challenge */ + + x = send_request(cl, "%d %s", CHALLENGE, buffer); + free(buffer); +cp + return x; } -int send_add_host(conn_list_t *cl, conn_list_t *new_host) +int challenge_h(connection_t *cl) { - ip_t real_ip; - int flags; - char *hostname; + char buffer[MAX_STRING_SIZE]; + int len; cp - real_ip = new_host->real_ip; - hostname = new_host->hostname; - flags = new_host->flags; - - /* 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(sscanf(cl->buffer, "%*d "MAX_STRING, buffer) != 1) { - flags &= ~EXPORTINDIRECTDATA; - flags |= INDIRECTDATA; - real_ip = myself->vpn_ip; - hostname = myself->hostname; + syslog(LOG_ERR, _("Got bad CHALLENGE from %s (%s)"), cl->name, cl->hostname); + return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ADD_HOST for " IP_ADDR_S " (%s) to " IP_ADDR_S " (%s)"), - IP_ADDR_V(new_host->vpn_ip), hostname, IP_ADDR_V(cl->vpn_ip), cl->hostname); + len = RSA_size(myself->rsa_key); - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx/%lx:%x %d\n", ADD_HOST, real_ip, new_host->vpn_ip, new_host->vpn_mask, new_host->port, flags); + /* Check if the length of the challenge is all right */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + if(strlen(buffer) != len*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; } + + /* Allocate buffers for the challenge */ + + if(!cl->mychallenge) + cl->mychallenge = xmalloc(len); + + /* Convert the challenge from hexadecimal back to binary */ + + hex2bin(buffer,cl->mychallenge,len); + + cl->allow_request = CHAL_REPLY; + + /* Rest is done by send_chal_reply() */ cp - return 0; + return send_chal_reply(cl); } -int send_key_changed(conn_list_t *cl, conn_list_t *src) +int send_chal_reply(connection_t *cl) { + char hash[SHA_DIGEST_LENGTH*2+1]; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending KEY_CHANGED origin " IP_ADDR_S " to " IP_ADDR_S " (%s)"), - IP_ADDR_V(src->vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", KEY_CHANGED, src->vpn_ip); - - if((write(cl->meta_socket, buffer, buflen)) < 0) + if(!cl->mychallenge) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Trying to send CHAL_REPLY to %s (%s) without a valid CHALLENGE"), cl->name, cl->hostname); return -1; } -cp - return 0; -} + + /* Calculate the hash from the challenge we received */ + + SHA1(cl->mychallenge, RSA_size(myself->rsa_key), hash); + + /* Convert the hash to a hexadecimal formatted string */ + + bin2hex(hash,hash,SHA_DIGEST_LENGTH); + hash[SHA_DIGEST_LENGTH*2] = '\0'; + + /* Send the reply */ -void send_key_changed_all(void) -{ - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - if(p->status.meta && p->status.active) - send_key_changed(p, myself); cp + return send_request(cl, "%d %s", CHAL_REPLY, hash); } -int send_basic_info(conn_list_t *cl) +int chal_reply_h(connection_t *cl) { + char hishash[MAX_STRING_SIZE]; + char myhash[SHA_DIGEST_LENGTH]; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending BASIC_INFO to %s"), - cl->hostname); + if(sscanf(cl->buffer, "%*d "MAX_STRING, hishash) != 1) + { + 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(hishash) != 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(hishash, hishash, SHA_DIGEST_LENGTH); + + /* Calculate the hash from the challenge we sent */ - 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); + SHA1(cl->hischallenge, RSA_size(cl->rsa_key), myhash); - if((write(cl->meta_socket, buffer, buflen)) < 0) + /* Verify the incoming hash with the calculated hash */ + + if(memcmp(hishash, myhash, SHA_DIGEST_LENGTH)) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname); + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + 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 0; + return ack_h(cl); } -int send_passphrase(conn_list_t *cl) +int send_metakey(connection_t *cl) { - passphrase_t tmp; + 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 - encrypt_passphrase(&tmp); + /* Copy random data to the buffer */ - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PASSPHRASE to " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + RAND_bytes(cl->cipher_outkey, len); - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PASSPHRASE, tmp.phrase); + /* The message we send must be smaller than the modulus of the RSA key. + By definition, for a key of k bits, the following formula holds: + + 2^(k-1) <= modulus < 2^(k) + + Where ^ means "to the power of", not "xor". + This means that to be sure, we must choose our message < 2^(k-1). + This can be done by setting the most significant bit to zero. + */ + + cl->cipher_outkey[0] &= 0x7F; + + 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); + } - if((write(cl->meta_socket, buffer, buflen)) < 0) + /* Encrypt the random data + + We do not use one of the PKCS padding schemes here. + This is allowed, because we encrypt a totally random string + with a length equal to that of the modulus of the RSA key. + */ + + if(RSA_public_encrypt(len, cl->cipher_outkey, buffer, cl->rsa_key, RSA_NO_PADDING) != len) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), cl->name, cl->hostname); + free(buffer); return -1; } cp - return 0; + /* 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 + len - EVP_bf_cfb()->key_len, + cl->cipher_outkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + + cl->status.encryptout = 1; +cp + return x; } -int send_public_key(conn_list_t *cl) +int metakey_h(connection_t *cl) { + char buffer[MAX_STRING_SIZE]; + int len; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PUBLIC_KEY to " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + 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; + } - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PUBLIC_KEY, my_public_key_base36); + /* Allocate buffers for the meta key */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + 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, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + 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 + len - EVP_bf_cfb()->key_len, + cl->cipher_inkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + + cl->status.decryptin = 1; + + cl->allow_request = CHALLENGE; cp - return 0; + return send_challenge(cl); } -/* WDN doet deze functie? (GS) -int send_calculate(conn_list_t *cl, char *k) +/* Address and subnet information exchange */ + +int send_add_subnet(connection_t *cl, subnet_t *subnet) { + int x; + char *netstr; + char *owner; cp - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", CALCULATE, k); + owner = subnet->owner->name; - if((write(cl->meta_socket, buffer, buflen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } + x = send_request(cl, "%d %s %s", ADD_SUBNET, + owner, netstr = net2str(subnet)); + free(netstr); cp - return 0; + return x; } -*/ -int send_key_request(ip_t to) +int add_subnet_h(connection_t *cl) { - conn_list_t *fw; + char subnetstr[MAX_STRING_SIZE]; + char name[MAX_STRING_SIZE]; + connection_t *owner, *p; + subnet_t *subnet; + avl_node_t *node; cp - fw = lookup_conn(to); - if(!fw) + if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2) { - syslog(LOG_ERR, _("Attempting to send REQ_KEY to " IP_ADDR_S ", which does not exist?"), - IP_ADDR_V(to)); + syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s)"), cl->name, cl->hostname); return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending REQ_KEY to " IP_ADDR_S " (%s)"), - IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->hostname); - - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx\n", REQ_KEY, to, myself->vpn_ip); + /* Check if owner name is a valid */ - if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0) + if(check_id(name)) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname); return -1; } - fw->status.waitingforkey = 1; -cp - return 0; -} -int send_key_answer(conn_list_t *cl, ip_t to) -{ - conn_list_t *fw; -cp + /* Check if subnet string is valid */ - fw = lookup_conn(to); - - if(!fw) + if(!(subnet = str2net(subnetstr))) { - syslog(LOG_ERR, _("Attempting to send ANS_KEY to " IP_ADDR_S ", which does not exist?"), - IP_ADDR_V(to)); + syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname); return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ANS_KEY to " IP_ADDR_S " (%s)"), - IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->hostname); + /* Check if somebody tries to add a subnet of ourself */ + + if(!strcmp(name, myself->name)) + { + syslog(LOG_ERR, _("Warning: got ADD_SUBNET from %s (%s) for ourself, restarting"), + cl->name, cl->hostname); + sighup = 1; + return 0; + } - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx %d %s\n", ANS_KEY, to, myself->vpn_ip, my_key_expiry, my_public_key_base36); + /* Check if the owner of the new subnet is in the connection list */ - if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0) + if(!(owner = lookup_id(name))) { - syslog(LOG_ERR, _("send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"), + name, cl->name, cl->hostname); return -1; } -cp - return 0; -} -/* - 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); + /* If everything is correct, add the subnet to the list of the owner */ + + subnet_add(owner, subnet); + + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p->status.active && p!= cl) + send_add_subnet(p, subnet); + } cp return 0; } -/* - notify one connection of everything - i have connected -*/ -int notify_one(conn_list_t *new) +int send_del_subnet(connection_t *cl, subnet_t *subnet) { - conn_list_t *p; + int x; + char *netstr; + char *owner; cp - for(p = conn_list; p != NULL; p = p->next) - if(p != new && p->status.active) - send_add_host(new, p); + owner = subnet->owner->name; + + x = send_request(cl, "%d %s %s", DEL_SUBNET, owner, netstr = net2str(subnet)); + free(netstr); cp - return 0; + return x; } -/* - The incoming request handlers -*/ - -int basic_info_h(conn_list_t *cl) +int del_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(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got BASIC_INFO from %s"), cl->hostname); - - if(sscanf(cl->buffer, "%*d %d %lx/%lx:%hx %d", &cl->protocol_version, &cl->vpn_ip, &cl->vpn_mask, &cl->port, &cl->flags) != 5) + if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 3) { - syslog(LOG_ERR, _("Got bad BASIC_INFO from %s"), - cl->hostname); - if(cl->status.outgoing) - { - /* If we get here, it means that our uplink uses the wrong protocol. - If we don't do anything, we will reconnect every 5 seconds. Pretty dumb. - So we disable the outgoing flag, so that we won't reconnect anymore. - This still allows other tinc daemons to connect to us. - */ - syslog(LOG_ERR, _("Warning: disabling uplink!")); - cl->status.outgoing = 0; - } - return -1; - } + syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s)"), cl->name, cl->hostname); + return -1; + } + + /* Check if owner name is a valid */ - if(cl->protocol_version != PROT_CURRENT) + if(check_id(name)) { - syslog(LOG_ERR, _("Peer uses incompatible protocol version %d"), - cl->protocol_version); + syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname); return -1; } - if(cl->status.outgoing) + /* Check if subnet string is valid */ + + if(!(subnet = str2net(subnetstr))) { - if(setup_vpn_connection(cl) < 0) - return -1; - send_basic_info(cl); + syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname); + return -1; } - else + + free(subnetstr); + + /* Check if somebody tries to add a subnet of ourself */ + + if(!strcmp(name, myself->name)) { - if(setup_vpn_connection(cl) < 0) - return -1; - send_passphrase(cl); + syslog(LOG_ERR, _("Warning: got DEL_SUBNET 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))); + /* Check if the owner of the new subnet is in the connection list */ - if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1) + if(!(owner = lookup_id(name))) { - syslog(LOG_ERR, _("Got bad PASSPHRASE from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + syslog(LOG_ERR, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"), + name, cl->name, cl->hostname); return -1; } - cl->pp->len = strlen(cl->pp->phrase); - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PASSPHRASE from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - if(cl->status.outgoing) - send_passphrase(cl); - else - send_public_key(cl); + /* If everything is correct, delete the subnet from the list of the owner */ + + subnet_del(subnet); + + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p->status.active && p!= cl) + send_del_subnet(p, subnet); + } cp return 0; } -int public_key_h(conn_list_t *cl) +/* New and closed connections notification */ + +int send_add_host(connection_t *cl, connection_t *other) +{ +cp + return send_request(cl, "%d %s %lx:%d %lx %s", ADD_HOST, + other->name, other->address, other->port, other->options, other->lastbutonehop->name); +} + +int add_host_h(connection_t *cl) { - char *g_n; - conn_list_t *old; + connection_t *old, *new, *p; + char name[MAX_STRING_SIZE], lastbutone[MAX_STRING_SIZE]; + avl_node_t *node; cp - if(sscanf(cl->buffer, "%*d %as", &g_n) != 1) + new = new_connection(); + + if(sscanf(cl->buffer, "%*d "MAX_STRING" %lx:%hd %lx "MAX_STRING, name, &new->address, &new->port, &new->options, lastbutone) != 5) { - syslog(LOG_ERR, _("Got bad PUBLIC_KEY from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s)"), cl->name, cl->hostname); return -1; - } + } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PUBLIC_KEY from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + /* Check if identity is a valid name */ - if(verify_passphrase(cl, g_n)) + if(check_id(name)) { - /* intruder! */ - syslog(LOG_ERR, _("Intruder: passphrase does not match!")); + syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname); + free_connection(new); return -1; } - if(cl->status.outgoing) - send_public_key(cl); - else + if(check_id(lastbutone)) + { + syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid lastbutone name"), cl->name, cl->hostname); + free_connection(new); + return -1; + } + + /* Check if somebody tries to add ourself */ + + if(!strcmp(name, myself->name)) + { + syslog(LOG_ERR, _("Got ADD_HOST from %s (%s) for ourself!"), cl->name, cl->hostname); + free_connection(new); + return -1; + } + + /* Fill in more of the new connection structure */ + + new->hostname = hostlookup(htonl(new->address)); + + new->lastbutonehop = lookup_id(lastbutone); + + if(!new->lastbutonehop) { - send_ack(cl); + syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): unknown lastbutone"), cl->name, cl->hostname); + free_connection(new); + return -1; + } - /* 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. */ + /* Check if the new host already exists in the connnection list */ - while(old=lookup_conn(cl->vpn_ip)) - terminate_connection(old); + if((old = lookup_id(name))) + { + if((new->address == old->address) && (new->port == old->port) && (cl->nexthop == old->nexthop)) + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"), + old->name, old->hostname, cl->name, cl->hostname); + free_connection(new); + return 0; + } + else + { + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Removing old entry for %s (%s) from %s in favour of new connection from %s"), + old->name, old->hostname, old->nexthop->name, cl->nexthop->name); - cl->status.active = 1; - notify_others(cl, NULL, send_add_host); - notify_one(cl); + terminate_connection(old, 0); + } } + + /* Hook it up into the active tree */ + + new->name = xstrdup(name); + active_add(new); + + /* Tell the rest about the new host */ + + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p->status.active && p!=cl) + send_add_host(p, new); + } + + /* Fill in rest of connection structure */ + + new->nexthop = cl; + new->cipher_pkttype = EVP_bf_cbc(); + new->cipher_pktkeylength = cl->cipher_pkttype->key_len + cl->cipher_pkttype->iv_len; cp return 0; } -int ack_h(conn_list_t *cl) +int send_del_host(connection_t *cl, connection_t *other) { cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ACK from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - - cl->status.active = 1; - syslog(LOG_NOTICE, _("Connection with " IP_ADDR_S " (%s) activated"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); -cp - return 0; + return send_request(cl, "%d %s %lx:%d %lx %s", DEL_HOST, + other->name, other->address, other->port, other->options, other->lastbutonehop->name); } -int termreq_h(conn_list_t *cl) +int del_host_h(connection_t *cl) { + char name[MAX_STRING_SIZE], lastbutone[MAX_STRING_SIZE]; + ipv4_t address; + port_t port; + long int options; + connection_t *old, *p; + avl_node_t *node; cp - if(!cl->status.active) + if(sscanf(cl->buffer, "%*d "MAX_STRING" %lx:%hd %lx "MAX_STRING, name, &address, &port, &options, lastbutone) != 5) { - syslog(LOG_ERR, _("Got unauthorized TERMREQ from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"), + cl->name, cl->hostname); return -1; } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got TERMREQ from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + + /* Check if identity is a valid name */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname); + return -1; + } + + if(check_id(lastbutone)) + { + syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid lastbutone name"), cl->name, cl->hostname); + return -1; + } + + /* Check if somebody tries to delete ourself */ + + if(!strcmp(name, myself->name)) + { + syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) for ourself!"), + cl->name, cl->hostname); + return -1; + } + + /* Check if the deleted host already exists in the connnection list */ + + if(!(old = lookup_id(name))) + { + syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) for %s which is not in our connection list"), + cl->name, cl->hostname, name); + return -1; + } + + /* Check if the rest matches */ - cl->status.termreq = 1; + if(address!=old->address || port!=old->port || options!=old->options || cl!=old->nexthop || strcmp(lastbutone, old->lastbutonehop->name)) + { + syslog(LOG_WARNING, _("Got DEL_HOST from %s (%s) for %s which doesn't match"), cl->name, cl->hostname, old->name); + return 0; + } - if(cl->status.active) - notify_others(cl, NULL, send_del_host); + /* Ok, since EVERYTHING seems to check out all right, delete it */ - cl->status.active = 0; + terminate_connection(old, 0); - terminate_connection(cl); + /* Tell the rest about the deleted host */ + + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p->status.active && p!=cl) + send_del_host(p, old); + } cp return 0; } -int timeout_h(conn_list_t *cl) +/* Status and error notification routines */ + +int send_status(connection_t *cl, int statusno, char *statusstring) { cp - if(!cl->status.active) + if(!statusstring) + statusstring = status_text[statusno]; +cp + return send_request(cl, "%d %d %s", STATUS, statusno, statusstring); +} + +int status_h(connection_t *cl) +{ + int statusno; + char statusstring[MAX_STRING_SIZE]; +cp + if(sscanf(cl->buffer, "%*d %d "MAX_STRING, &statusno, statusstring) != 2) { - syslog(LOG_ERR, _("Got unauthorized TIMEOUT from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; + syslog(LOG_ERR, _("Got bad STATUS from %s (%s)"), + cl->name, cl->hostname); + return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got TIMEOUT from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + if(debug_lvl >= DEBUG_STATUS) + { + syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"), + cl->name, cl->hostname, status_text[statusno], statusstring); + } - cl->status.termreq = 1; - terminate_connection(cl); cp return 0; } -int del_host_h(conn_list_t *cl) +int send_error(connection_t *cl, int err, char *errstring) { - ip_t vpn_ip; - conn_list_t *fw; cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized DEL_HOST from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } + if(!errstring) + errstring = strerror(err); + return send_request(cl, "%d %d %s", ERROR, err, errstring); +} - if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1) +int error_h(connection_t *cl) +{ + int err; + char errorstring[MAX_STRING_SIZE]; +cp + if(sscanf(cl->buffer, "%*d %d "MAX_STRING, &err, errorstring) != 2) { - syslog(LOG_ERR, _("Got bad DEL_HOST from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + syslog(LOG_ERR, _("Got bad ERROR from %s (%s)"), + cl->name, cl->hostname); return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got DEL_HOST for " IP_ADDR_S " from " IP_ADDR_S " (%s)"), - IP_ADDR_V(vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname); + } - if(!(fw = lookup_conn(vpn_ip))) + if(debug_lvl >= DEBUG_ERROR) { - syslog(LOG_ERR, _("Got DEL_HOST for " IP_ADDR_S " from " IP_ADDR_S " (%s) which does not exist?"), - IP_ADDR_V(vpn_ip), IP_ADDR_V(cl->vpn_ip), cl->hostname); - return 0; + syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"), + cl->name, cl->hostname, strerror(err), errorstring); } - notify_others(fw, cl, send_del_host); + terminate_connection(cl, cl->status.meta); +cp + return 0; +} - fw->status.termreq = 1; - fw->status.active = 0; +int send_termreq(connection_t *cl) +{ +cp + return send_request(cl, "%d", TERMREQ); +} - terminate_connection(fw); +int termreq_h(connection_t *cl) +{ +cp + terminate_connection(cl, cl->status.meta); cp return 0; } -int ping_h(conn_list_t *cl) +int send_ping(connection_t *cl) { + char salt[SALTLEN*2+1]; cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized PING from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } + cl->status.pinged = 1; + cl->last_ping_time = time(NULL); + RAND_pseudo_bytes(salt, SALTLEN); + bin2hex(salt, salt, SALTLEN); + salt[SALTLEN*2] = '\0'; +cp + return send_request(cl, "%d %s", PING, salt); +} - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PING from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); +int ping_h(connection_t *cl) +{ +cp + return send_pong(cl); +} - cl->status.pinged = 0; - cl->status.got_pong = 1; +int send_pong(connection_t *cl) +{ + char salt[SALTLEN*2+1]; +cp + RAND_pseudo_bytes(salt, SALTLEN); + bin2hex(salt, salt, SALTLEN); + salt[SALTLEN*2] = '\0'; +cp + return send_request(cl, "%d %s", PONG, salt); +} - send_pong(cl); +int pong_h(connection_t *cl) +{ +cp + cl->status.pinged = 0; cp return 0; } -int pong_h(conn_list_t *cl) +/* Key exchange */ + +int send_key_changed(connection_t *from, connection_t *cl) { + connection_t *p; + avl_node_t *node; cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized PONG from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } + /* Only send this message if some other daemon requested our key previously. + This reduces unnecessary key_changed broadcasts. + */ - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PONG from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + if(from==myself && !mykeyused) + return 0; - cl->status.got_pong = 1; + for(node = connection_tree->head; node; node = node->next) + { + p = (connection_t *)node->data; + if(p != cl && p->status.active) + send_request(p, "%d %s", KEY_CHANGED, from->name); + } cp return 0; } -int add_host_h(conn_list_t *cl) +int key_changed_h(connection_t *cl) { - ip_t real_ip; - ip_t vpn_ip; - ip_t vpn_mask; - unsigned short port; - int flags; - conn_list_t *ncn, *fw; + char from_id[MAX_STRING_SIZE]; + connection_t *from; cp - if(!cl->status.active) + if(sscanf(cl->buffer, "%*d "MAX_STRING, from_id) != 1) { - syslog(LOG_ERR, _("Got unauthorized ADD_HOST from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"), + cl->name, cl->hostname); 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 from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } - /* - Suggestion of Hans Bayle - */ - if((fw = lookup_conn(vpn_ip))) + if(!(from = lookup_id(from_id))) { - if(fw->nexthop == cl) - notify_others(fw, cl, send_add_host); - else - syslog(LOG_DEBUG, _("Invalid ADD_HOST from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + 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); return -1; } - ncn = new_conn_list(); - ncn->real_ip = real_ip; - ncn->hostname = hostlookup(htonl(real_ip)); - ncn->vpn_ip = vpn_ip; - ncn->vpn_mask = vpn_mask; - ncn->port = port; - ncn->flags = flags; - ncn->nexthop = cl; - ncn->next = conn_list; - conn_list = ncn; - ncn->status.active = 1; - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ADD_HOST for " IP_ADDR_S " (%s) from " IP_ADDR_S " (%s)"), - IP_ADDR_V(ncn->vpn_ip), ncn->hostname, IP_ADDR_V(cl->vpn_ip), cl->hostname); + from->status.validkey = 0; + from->status.waitingforkey = 0; - notify_others(ncn, cl, send_add_host); + send_key_changed(from, cl); cp return 0; } -int req_key_h(conn_list_t *cl) +int send_req_key(connection_t *from, connection_t *to) { - ip_t to; - ip_t from; - conn_list_t *fw; cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized REQ_KEY from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } + return send_request(to->nexthop, "%d %s %s", REQ_KEY, + from->name, to->name); +} - if(sscanf(cl->buffer, "%*d %lx %lx", &to, &from) != 2) +int req_key_h(connection_t *cl) +{ + char from_id[MAX_STRING_SIZE]; + char to_id[MAX_STRING_SIZE]; + connection_t *from, *to; + char pktkey[129]; +cp + if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING, from_id, to_id) != 2) { - syslog(LOG_ERR, _("Got bad REQ_KEY from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"), + cl->name, cl->hostname); return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got REQ_KEY origin " IP_ADDR_S " destination " IP_ADDR_S " from " IP_ADDR_S " (%s)"), - IP_ADDR_V(from), IP_ADDR_V(to), IP_ADDR_V(cl->vpn_ip), cl->hostname); - - 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 REQ_KEY to " IP_ADDR_S ", which does not exist?"), - IP_ADDR_V(to)); + 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); return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Forwarding REQ_KEY to " IP_ADDR_S " (%s)"), - IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->hostname); - - cl->buffer[cl->reqlen-1] = '\n'; - - if(write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen) < 0) + /* Check if this key request is for us */ + + if(!strcmp(to_id, myself->name)) /* Yes, send our own key back */ { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; + bin2hex(myself->cipher_pktkey, pktkey, myself->cipher_pktkeylength); + pktkey[myself->cipher_pktkeylength*2] = '\0'; + send_ans_key(myself, from, pktkey); + mykeyused = 1; } + 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->name, cl->hostname, to_id); + return -1; + } + + if(to->status.validkey) /* Proxy keys */ + { + bin2hex(to->cipher_pktkey, pktkey, to->cipher_pktkeylength); + pktkey[to->cipher_pktkeylength*2] = '\0'; + send_ans_key(to, from, pktkey); + } + else + send_req_key(from, to); + } + cp return 0; } -void set_keys(conn_list_t *cl, int expiry, char *key) +int send_ans_key(connection_t *from, connection_t *to, char *pktkey) { - char *ek; cp - if(!cl->public_key) + return send_request(to->nexthop, "%d %s %s %s", ANS_KEY, + from->name, to->name, pktkey); +} + +int ans_key_h(connection_t *cl) +{ + char from_id[MAX_STRING_SIZE]; + char to_id[MAX_STRING_SIZE]; + char pktkey[MAX_STRING_SIZE]; + int keylength; + connection_t *from, *to; +cp + if(sscanf(cl->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING, from_id, to_id, pktkey) != 3) { - cl->public_key = xmalloc(sizeof(*cl->key)); - cl->public_key->key = NULL; + syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"), + cl->name, cl->hostname); + 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) + + if(!(from = lookup_id(from_id))) { - cl->key = xmalloc(sizeof(*cl->key)); - cl->key->key = NULL; + 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); + return -1; } - if(cl->key->key) - free(cl->key->key); + /* Check correctness of packet key */ - cl->key->length = strlen(ek); - cl->key->expiry = expiry; - cl->key->key = xmalloc(cl->key->length + 1); - strcpy(cl->key->key, ek); -cp -} + keylength = strlen(pktkey); -int ans_key_h(conn_list_t *cl) -{ - ip_t to; - ip_t from; - int expiry; - char *key; - conn_list_t *fw, *gk; -cp - if(!cl->status.active) + if(keylength != from->cipher_pktkeylength*2) { - syslog(LOG_ERR, _("Got unauthorized ANS_KEY from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); + syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key length"), + cl->name, cl->hostname, from->name); return -1; } - if(sscanf(cl->buffer, "%*d %lx %lx %d %as", &to, &from, &expiry, &key) != 4) - { - syslog(LOG_ERR, _("Got bad ANS_KEY from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ANS_KEY origin " IP_ADDR_S " destination " IP_ADDR_S " from " IP_ADDR_S " (%s)"), - IP_ADDR_V(from), IP_ADDR_V(to), IP_ADDR_V(cl->vpn_ip), cl->hostname); + /* Forward it if necessary */ - if(to == myself->vpn_ip) - { /* hey! that key's for ME! :) */ - gk = lookup_conn(from); - - if(!gk) + if(strcmp(to_id, myself->name)) + { + if(!(to = lookup_id(to_id))) { - syslog(LOG_ERR, _("Receiving ANS_KEY from " IP_ADDR_S ", which does not exist?"), - IP_ADDR_V(from)); + 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); return -1; } - - set_keys(gk, expiry, key); - gk->status.validkey = 1; - gk->status.waitingforkey = 0; - flush_queues(gk); - return 0; + send_ans_key(from, to, pktkey); } - fw = lookup_conn(to); - - if(!fw) - { - syslog(LOG_ERR, _("Attempting to forward ANS_KEY to " IP_ADDR_S ", which does not exist?"), - IP_ADDR_V(to)); - return -1; - } + /* Update our copy of the origin's packet key */ - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Forwarding ANS_KEY to " IP_ADDR_S " (%s)"), - IP_ADDR_V(fw->nexthop->vpn_ip), fw->nexthop->hostname); + if(from->cipher_pktkey) + free(from->cipher_pktkey); - cl->buffer[cl->reqlen-1] = '\n'; + from->cipher_pktkey = xstrdup(pktkey); + keylength /= 2; + hex2bin(from->cipher_pktkey, from->cipher_pktkey, keylength); + from->cipher_pktkey[keylength] = '\0'; - if((write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen)) < 0) - { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; - } + from->status.validkey = 1; + from->status.waitingforkey = 0; + + flush_queue(from); cp return 0; } -int key_changed_h(conn_list_t *cl) +int send_tcppacket(connection_t *cl, vpn_packet_t *packet) { - ip_t from; - conn_list_t *ik; -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized KEY_CHANGED from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } - - if(sscanf(cl->buffer, "%*d %lx", &from) != 1) - { - syslog(LOG_ERR, _("Got bad KEY_CHANGED from " IP_ADDR_S " (%s)"), - IP_ADDR_V(cl->vpn_ip), cl->hostname); - return -1; - } + int x; +cp + /* Evil hack. */ - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got KEY_CHANGED origin " IP_ADDR_S " from " IP_ADDR_S " (%s)"), - IP_ADDR_V(from), IP_ADDR_V(cl->vpn_ip), cl->hostname); + x = send_request(cl->nexthop, "%d %hd", PACKET, packet->len); - ik = lookup_conn(from); + if(x) + return x; +cp + return send_meta(cl, packet->data, packet->len); +} - if(!ik) +int tcppacket_h(connection_t *cl) +{ + short int len; +cp + if(sscanf(cl->buffer, "%*d %hd", &len) != 1) { - syslog(LOG_ERR, _("Got KEY_CHANGED from " IP_ADDR_S ", which does not exist?"), - IP_ADDR_V(from)); + syslog(LOG_ERR, _("Got bad PACKET from %s (%s)"), cl->name, cl->hostname); return -1; } - ik->status.validkey = 0; - ik->status.waitingforkey = 0; + /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */ - notify_others(ik, cl, send_key_changed); + cl->tcplen = len; 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 +/* Jumptable for the request handlers */ + +int (*request_handlers[])(connection_t*) = { + id_h, metakey_h, challenge_h, chal_reply_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, + tcppacket_h, +}; + +/* Request names */ + +char (*request_name[]) = { + "ID", "METAKEY", "CHALLENGE", "CHAL_REPLY", + "STATUS", "ERROR", "TERMREQ", + "PING", "PONG", + "ADD_HOST", "DEL_HOST", + "ADD_SUBNET", "DEL_SUBNET", + "KEY_CHANGED", "REQ_KEY", "ANS_KEY", + "PACKET", +}; + +/* Status strings */ + +char (*status_text[]) = { + "Warning", +}; + +/* Error strings */ + +char (*error_text[]) = { + "Error", };