X-Git-Url: https://tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=6cb8037940f7296a1be2c99a5dacda3929f19864;hp=7bd64cc91bd7f5f63ddad91706ecd84ceb81423f;hb=54b756f7dfb71c5622b7738fd449e126da959864;hpb=ac73c72488dd8b33464fac1f392e89df48f7a23b diff --git a/src/protocol.c b/src/protocol.c index 7bd64cc9..6cb80379 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 1.28.4.22 2000/08/08 08:48:50 guus Exp $ + $Id: protocol.c,v 1.28.4.116 2001/10/31 20:02:06 guus Exp $ */ #include "config.h" @@ -30,1059 +30,1524 @@ #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 "node.h" +#include "edge.h" +#include "graph.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 *c, const char *format, ...) { + va_list args; + char buffer[MAXBUFSIZE]; + int len, request; + cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ACK to %s (%s)"), - cl->vpn_hostname, cl->real_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], c->name, c->hostname); return -1; } + + if(debug_lvl >= DEBUG_PROTOCOL) + { + 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); + } + + buffer[len++] = '\n'; cp - return 0; + return send_meta(c, buffer, len); } -int send_termreq(conn_list_t *cl) +int receive_request(connection_t *c) { + int request; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending TERMREQ to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + if(sscanf(c->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"), + 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_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); + } + } - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", TERMREQ, myself->vpn_ip); + if((c->allow_request != ALL) && (c->allow_request != request)) + { + syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname); + return -1; + } - if(write(cl->meta_socket, buffer, buflen) < 0) + if(request_handlers[request](c)) + /* Something went wrong. Probably scriptkiddies. Terminate. */ + { + syslog(LOG_ERR, _("Error while processing %s from %s (%s)"), + request_name[request], c->name, c->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)"), + c->name, c->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 *c) { cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending TIMEOUT to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + return send_request(c, "%d %s %d", ID, myself->connection->name, myself->connection->protocol_version); +} + +int id_h(connection_t *c) +{ + char name[MAX_STRING_SIZE]; +int bla; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" %d", name, &c->protocol_version) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ID", c->name, c->hostname); + return -1; + } + + /* Check if identity is a valid name */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ID", c->name, c->hostname, "invalid name"); + return -1; + } + + /* If we set c->name in advance, make sure we are connected to the right host */ + + if(c->name) + { + if(strcmp(c->name, name)) + { + syslog(LOG_ERR, _("Peer %s is %s instead of %s"), c->hostname, name, c->name); + return -1; + } + } + else + c->name = xstrdup(name); + + /* Check if version matches */ + + if(c->protocol_version != myself->connection->protocol_version) + { + syslog(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"), + c->name, c->hostname, c->protocol_version); + return -1; + } + + if(bypass_security) + { + if(!c->config_tree) + init_configuration(&c->config_tree); + c->allow_request = ACK; + return send_ack(c); + } + + if(!c->config_tree) + { + init_configuration(&c->config_tree); - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", PINGTIMEOUT, myself->vpn_ip); + if((bla = read_connection_config(c))) + { + syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname, c->name); + return -1; + } + } - if((write(cl->meta_socket, buffer, buflen)) < 0) + if(read_rsa_public_key(c)) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); return -1; } + + c->allow_request = METAKEY; cp - return 0; + return send_metakey(c); } -int send_del_host(conn_list_t *cl, conn_list_t *new_host) +int send_metakey(connection_t *c) { + char *buffer; + int len, x; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending DEL_HOST for %s (%s) to %s (%s)"), - new_host->vpn_hostname, new_host->real_hostname, cl->vpn_hostname, cl->real_hostname); + len = RSA_size(c->rsa_key); + + /* Allocate buffers for the meta key */ + + buffer = xmalloc(len*2+1); - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", DEL_HOST, new_host->vpn_ip); + if(!c->outkey) + c->outkey = xmalloc(len); + + if(!c->outctx) + c->outctx = xmalloc(sizeof(*c->outctx)); +cp + /* Copy random data to the buffer */ + + RAND_bytes(c->outkey, len); + + /* 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. + */ + + c->outkey[0] &= 0x7F; + + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(c->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, c->outkey, buffer, c->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)"), c->name, c->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(c, "%d %s", METAKEY, buffer); + free(buffer); + + /* Further outgoing requests are encrypted with the key we just generated */ + + EVP_EncryptInit(c->outctx, EVP_bf_cfb(), + c->outkey + len - EVP_bf_cfb()->key_len, + c->outkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + + c->status.encryptout = 1; +cp + return x; } -/* Evil hack - TCP tunneling is bad */ -int send_tcppacket(conn_list_t *cl, void *data, int len) +int metakey_h(connection_t *c) { + char buffer[MAX_STRING_SIZE]; + int len; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PACKET to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + if(sscanf(c->buffer, "%*d "MAX_STRING, buffer) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name, c->hostname); + return -1; + } - buflen = snprintf(buffer, MAXBUFSIZE, "%d %d\n", PACKET, len); + len = RSA_size(myself->connection->rsa_key); - if((write(cl->meta_socket, buffer, buflen)) != buflen) + /* Check if the length of the meta key is all right */ + + if(strlen(buffer) != len*2) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength"); return -1; } - if((write(cl->meta_socket, data, len)) != len) + /* Allocate buffers for the meta key */ + + if(!c->inkey) + c->inkey = xmalloc(len); + + if(!c->inctx) + c->inctx = xmalloc(sizeof(*c->inctx)); + + /* Convert the challenge from hexadecimal back to binary */ + + hex2bin(buffer,buffer,len); + + /* Decrypt the meta key */ + + if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->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)"), c->name, c->hostname); return -1; } + + if(debug_lvl >= DEBUG_SCARY_THINGS) + { + bin2hex(c->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(c->inctx, EVP_bf_cfb(), + c->inkey + len - EVP_bf_cfb()->key_len, + c->inkey + len - EVP_bf_cfb()->key_len - EVP_bf_cfb()->iv_len); + c->status.decryptin = 1; + + c->allow_request = CHALLENGE; cp - return 0; + return send_challenge(c); } -int send_ping(conn_list_t *cl) +int send_challenge(connection_t *c) { + char *buffer; + int len, x; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PING to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + /* CHECKME: what is most reasonable value for len? */ - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PING); + len = RSA_size(c->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(c->hischallenge) + free(c->hischallenge); + + c->hischallenge = xmalloc(len); cp - return 0; + /* Copy random data to the buffer */ + + RAND_bytes(c->hischallenge, len); + +cp + /* Convert to hex */ + + bin2hex(c->hischallenge, buffer, len); + buffer[len*2] = '\0'; + +cp + /* Send the challenge */ + + x = send_request(c, "%d %s", CHALLENGE, buffer); + free(buffer); +cp + return x; } -int send_pong(conn_list_t *cl) +int challenge_h(connection_t *c) { + char buffer[MAX_STRING_SIZE]; + int len; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PONG to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + if(sscanf(c->buffer, "%*d "MAX_STRING, buffer) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name, c->hostname); + return -1; + } + + len = RSA_size(myself->connection->rsa_key); - buflen = snprintf(buffer, MAXBUFSIZE, "%d\n", PONG); + /* 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, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong challenge length"); return -1; } + + /* Allocate buffers for the challenge */ + + if(!c->mychallenge) + c->mychallenge = xmalloc(len); + + /* Convert the challenge from hexadecimal back to binary */ + + hex2bin(buffer,c->mychallenge,len); + + c->allow_request = CHAL_REPLY; + + /* Rest is done by send_chal_reply() */ cp - return 0; + return send_chal_reply(c); } -int send_add_host(conn_list_t *cl, conn_list_t *new_host) +int send_chal_reply(connection_t *c) { - ip_t real_ip; - int flags; - char *hostname; + char hash[SHA_DIGEST_LENGTH*2+1]; cp - real_ip = new_host->real_ip; - hostname = new_host->real_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) + /* Calculate the hash from the challenge we received */ + + SHA1(c->mychallenge, RSA_size(myself->connection->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 */ + +cp + return send_request(c, "%d %s", CHAL_REPLY, hash); +} + +int chal_reply_h(connection_t *c) +{ + char hishash[MAX_STRING_SIZE]; + char myhash[SHA_DIGEST_LENGTH]; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING, hishash) != 1) { - flags &= ~EXPORTINDIRECTDATA; - flags |= INDIRECTDATA; - real_ip = myself->vpn_ip; - hostname = myself->real_hostname; + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name, c->hostname); + return -1; + } + + /* Check if the length of the hash is all right */ + + if(strlen(hishash) != SHA_DIGEST_LENGTH*2) + { + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply length")); + return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ADD_HOST for %s (%s) to %s (%s)"), - new_host->vpn_hostname, hostname, cl->vpn_hostname, cl->real_hostname); + /* Convert the hash to binary format */ - 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); + hex2bin(hishash, hishash, SHA_DIGEST_LENGTH); - if((write(cl->meta_socket, buffer, buflen)) < 0) + /* Calculate the hash from the challenge we sent */ + + SHA1(c->hischallenge, RSA_size(c->rsa_key), myhash); + + /* 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, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply")); + 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. + Send an acknowledgement with the rest of the information needed. + */ + + c->allow_request = ACK; cp - return 0; + return send_ack(c); } -int send_key_changed(conn_list_t *cl, conn_list_t *src) +int send_ack(connection_t *c) { + /* ACK message contains rest of the information the other end needs + to create node_t and edge_t structures. */ + + struct timeval now; + + /* Estimate weight */ + + gettimeofday(&now, NULL); + c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000; cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending KEY_CHANGED origin %s to %s (%s)"), - src->vpn_hostname, cl->vpn_hostname, cl->real_hostname); + return send_request(c, "%d %hd %d", ACK, myself->port, c->estimated_weight); +} + +int ack_h(connection_t *c) +{ + port_t port; + int weight; + node_t *n; + subnet_t *s; + edge_t *e; + connection_t *other; + avl_node_t *node, *node2; +cp + if(sscanf(c->buffer, "%*d %hd %d", &port, &weight) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name, c->hostname); + return -1; + } + + /* Check if we already have a node_t for him */ - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx\n", KEY_CHANGED, src->vpn_ip); + n = lookup_node(c->name); + + if(!n) + { + n = new_node(); + n->name = xstrdup(c->name); + n->address = c->address; + n->hostname = xstrdup(c->hostname); + n->port = port; + + /* FIXME: Also check if no other tinc daemon uses the same IP and port for UDP traffic */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + node_add(n); + } + else { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; + if(n->connection) + { + /* Oh dear, we already have a connection to this node. */ + syslog(LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"), n->name, n->hostname); + terminate_connection(n->connection, 0); + } + + /* FIXME: check if information in existing node matches that of the other end of this connection */ + } + + n->connection = c; + c->node = n; + + /* Check some options + + if((cfg = get_config_val(c->config, config_indirectdata))) + { + if(cfg->data.val == stupid_true) + c->options |= OPTION_INDIRECT; + } + + if((cfg = get_config_val(c->config, config_tcponly))) + { + if(cfg->data.val == stupid_true) + c->options |= OPTION_TCPONLY; + } + + if((myself->options | c->options) & OPTION_INDIRECT) + c->via = myself; + else + c->via = c; + + */ + + /* Create an edge_t for this connection */ + + c->edge = new_edge(); + + c->edge->from = myself; + c->edge->to = n; + c->edge->weight = (weight + c->estimated_weight) / 2; + c->edge->connection = c; + + edge_add(c->edge); + + /* Activate this connection */ + + c->allow_request = ALL; + c->status.active = 1; + c->node->cipher = EVP_bf_cbc(); + c->node->keylength = c->node->cipher->key_len + c->node->cipher->iv_len; + + if(debug_lvl >= DEBUG_CONNECTIONS) + syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), c->name, c->hostname); + +cp + /* Send him our subnets */ + + for(node = myself->subnet_tree->head; node; node = node->next) + { + s = (subnet_t *)node->data; + send_add_subnet(c, s); + } + + /* And send him all known nodes and their subnets */ + + for(node = node_tree->head; node; node = node->next) + { + n = (node_t *)node->data; + + if(n == c->node || n == myself) + continue; + + send_add_node(c, n); + + for(node2 = c->node->subnet_tree->head; node2; node2 = node2->next) + { + s = (subnet_t *)node2->data; + send_add_subnet(c, s); + } + } + + /* Send all known edges */ + + for(node = edge_tree->head; node; node = node->next) + { + e = (edge_t *)node->data; + + if(e == c->edge) + continue; + + send_add_edge(c, e); } + + /* Notify others of this connection */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + + if(other == c) + continue; + + send_add_node(other, c->node); + send_add_edge(other, c->edge); + } + + /* Run MST and SSSP algorithms */ + + mst_kruskal(); + sssp_bfs(0); cp return 0; } -void send_key_changed_all(void) + + +/* Address and subnet information exchange */ + +int send_add_subnet(connection_t *c, subnet_t *subnet) { - conn_list_t *p; + int x; + char *netstr; cp - for(p = conn_list; p != NULL; p = p->next) - if(p->status.meta && p->status.active) - send_key_changed(p, myself); + x = send_request(c, "%d %s %s", ADD_SUBNET, + subnet->owner->name, netstr = net2str(subnet)); + free(netstr); cp + return x; } -int send_basic_info(conn_list_t *cl) +int add_subnet_h(connection_t *c) { -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending BASIC_INFO to %s"), - cl->real_hostname); + char subnetstr[MAX_STRING_SIZE]; + char name[MAX_STRING_SIZE]; + node_t *owner; + connection_t *other; + subnet_t *s; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_SUBNET", c->name, c->hostname); + return -1; + } + + /* Check if owner name is a valid */ + + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid name")); + return -1; + } - 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 subnet string is valid */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + if(!(s = str2net(subnetstr))) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_SUBNET", c->name, c->hostname, _("invalid subnet string")); return -1; } + + /* Check if the owner of the new subnet is in the connection list */ + + if(!(owner = lookup_node(name))) + { + syslog(LOG_ERR, _("Got ADD_SUBNET from %s (%s) for %s which is not in our connection list"), + name, c->name, c->hostname); + return -1; + } + + /* If everything is correct, add the subnet to the list of the owner */ + + subnet_add(owner, s); + + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_add_subnet(other, s); + } cp return 0; } -int send_passphrase(conn_list_t *cl) +int send_del_subnet(connection_t *c, subnet_t *s) { - passphrase_t tmp; + int x; + char *netstr; cp - encrypt_passphrase(&tmp); + x = send_request(c, "%d %s %s", DEL_SUBNET, s->owner->name, netstr = net2str(s)); + free(netstr); +cp + return x; +} + +int del_subnet_h(connection_t *c) +{ + char subnetstr[MAX_STRING_SIZE]; + char name[MAX_STRING_SIZE]; + node_t *owner; + connection_t *other; + subnet_t *s, *find; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, name, subnetstr) != 3) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_SUBNET", c->name, c->hostname); + return -1; + } + + /* Check if owner name is a valid */ - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PASSPHRASE to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + if(check_id(name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Check if subnet string is valid */ + + if(!(s = str2net(subnetstr))) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_SUBNET", c->name, c->hostname, _("invalid subnet string")); + return -1; + } + + /* Check if the owner of the new subnet is in the connection list */ + + if(!(owner = lookup_node(name))) + { + syslog(LOG_ERR, _("Got %s from %s (%s) for %s which is not in our connection list"), + "DEL_SUBNET", c->name, c->hostname, name); + return -1; + } - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PASSPHRASE, tmp.phrase); + /* If everything is correct, delete the subnet from the list of the owner */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + find = lookup_subnet(owner, s); + + if(!find) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got %s from %s (%s) for %s which does not appear in his subnet tree"), + "DEL_SUBNET", c->name, c->hostname, name); return -1; } + + subnet_del(owner, s); + + /* Tell the rest */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_subnet(other, s); + } cp return 0; } -int send_public_key(conn_list_t *cl) +/* New and closed connections notification */ + +int send_add_node(connection_t *c, node_t *n) { cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending PUBLIC_KEY to %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + return send_request(c, "%d %s %lx:%d", ADD_NODE, + n->name, n->address, n->port); +} - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", PUBLIC_KEY, my_public_key_base36); +int add_node_h(connection_t *c) +{ + connection_t *other; + node_t *n; + char name[MAX_STRING_SIZE]; + ipv4_t address; + port_t port; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" %lx:%hd", name, &address, &port) != 3) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_NODE", c->name, c->hostname); + return -1; + } + + /* Check if identity is a valid name */ - if((write(cl->meta_socket, buffer, buflen)) < 0) + if(check_id(name)) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_NODE", c->name, c->hostname, _("invalid name")); return -1; } + + /* Check if node already exists */ + + n = lookup_node(name); + + if(n) + { + /* Check if it matches */ + + if(n->address != address || n->port != port) + syslog(LOG_DEBUG, _("Got %s from %s (%s) for %s which does not match existing entry"), "ADD_NODE", c->name, c->hostname, n->name); + + return 0; + } + else + { + n = new_node(); + n->name = xstrdup(name); + n->address = address; + n->port = port; + node_add(n); + } + + /* Tell the rest about the new node */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other !=c) + send_add_node(other, n); + } + cp return 0; } -/* WDN doet deze functie? (GS) -int send_calculate(conn_list_t *cl, char *k) +int send_del_node(connection_t *c, node_t *n) { cp - buflen = snprintf(buffer, MAXBUFSIZE, "%d %s\n", CALCULATE, k); + return send_request(c, "%d %s %lx:%d", DEL_NODE, + n->name, n->address, n->port); +} - if((write(cl->meta_socket, buffer, buflen)) < 0) +int del_node_h(connection_t *c) +{ + node_t *n; + char name[MAX_STRING_SIZE]; + ipv4_t address; + port_t port; + connection_t *other; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" %lx:%hd", name, &address, &port) != 3) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_NODE", + c->name, c->hostname); return -1; } -cp - return 0; -} -*/ -int send_key_request(ip_t to) -{ - conn_list_t *fw; -cp - fw = lookup_conn(to); - if(!fw) + /* Check if identity is a valid name */ + + if(check_id(name)) { - syslog(LOG_ERR, _("Attempting to send REQ_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_NODE", c->name, c->hostname, _("invalid name")); return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending REQ_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); + /* Check if somebody tries to delete ourself */ - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx\n", REQ_KEY, to, myself->vpn_ip); - - if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0) + if(!strcmp(name, myself->name)) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got %s from %s (%s) for ourself!"), "DEL_NODE", + c->name, c->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 the deleted host exists */ - fw = lookup_conn(to); + n = lookup_node(name); + + if(!n) + { + syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which does not exist"), "DEL_NODE", c->name, c->hostname, n->name); + return 0; + } - if(!fw) + /* Check if the rest matches */ + + if(address != n->address || port != n->port) { - syslog(LOG_ERR, _("Attempting to send ANS_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); - return -1; + syslog(LOG_WARNING, _("Got %s from %s (%s) for %s which does not match existing entry"), "DEL_NODE", c->name, c->hostname, n->name); } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Sending ANS_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); + /* Tell the rest about the deleted node */ - buflen = snprintf(buffer, MAXBUFSIZE, "%d %lx %lx %d %s\n", ANS_KEY, to, myself->vpn_ip, my_key_expiry, my_public_key_base36); - - if((write(fw->nexthop->meta_socket, buffer, buflen)) < 0) + for(node = connection_tree->head; node; node = node->next) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_node(other, n); } + + /* Delete the node */ + + node_del(n); + + mst_kruskal(); + sssp_bfs(0); 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*)) +/* Edges */ + +int send_add_edge(connection_t *c, edge_t *e) { - 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(c, "%d %s %s %lx %d", ADD_NODE, + e->from->name, e->to->name, e->options, e->weight); } -/* - notify one connection of everything - i have connected -*/ -int notify_one(conn_list_t *new) +int add_edge_h(connection_t *c) { - 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; -} + connection_t *other; + edge_t *e; + node_t *from, *to; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + long int options; + int weight; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" %lx %d", from_name, to_name, &options, &weight) != 4) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ADD_EDGE", c->name, c->hostname); + return -1; + } -/* - The incoming request handlers -*/ + /* Check if names are valid */ -int basic_info_h(conn_list_t *cl) -{ - conn_list_t *old; -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got BASIC_INFO from %s"), cl->real_hostname); + if(check_id(from_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } - 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(check_id(to_name)) { - syslog(LOG_ERR, _("Got bad BASIC_INFO from %s"), - cl->real_hostname); - return -1; + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Lookup nodes */ + + from = lookup_node(from_name); + + if(!from) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("unknown node")); + return -1; } - - cl->vpn_hostname = hostlookup(htonl(cl->vpn_ip)); - if(cl->protocol_version != PROT_CURRENT) + to = lookup_node(to_name); + + if(!to) { - syslog(LOG_ERR, _("Peer uses incompatible protocol version %d"), - cl->protocol_version); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("unknown node")); return -1; } - if(cl->status.outgoing) + /* Check if edge already exists */ + + e = lookup_edge(from, to); + + if(e) { - /* 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((old=lookup_conn(cl->vpn_ip))) + if(e->weight != weight || e->options != options) { - if(debug_lvl>0) - syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), - cl->vpn_hostname, cl->real_hostname); - cl->status.outgoing = 0; - old->status.outgoing = 1; - terminate_connection(cl); - return 0; + syslog(LOG_ERR, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + return -1; } - - if(setup_vpn_connection(cl) < 0) - return -1; - send_basic_info(cl); + + return 0; } else { - - if(setup_vpn_connection(cl) < 0) - return -1; - send_passphrase(cl); + e = new_edge(); + e->from = from; + e->to = to; + e->options = options; + e->weight = weight; + edge_add(e); } -cp - return 0; -} -int passphrase_h(conn_list_t *cl) -{ -cp - cl->pp = xmalloc(sizeof(*(cl->pp))); + /* Tell the rest about the new edge */ - if(sscanf(cl->buffer, "%*d %as", &(cl->pp->phrase)) != 1) + for(node = connection_tree->head; node; node = node->next) { - syslog(LOG_ERR, _("Got bad PASSPHRASE from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_add_edge(other, e); } - cl->pp->len = strlen(cl->pp->phrase); - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PASSPHRASE from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - if(cl->status.outgoing) - send_passphrase(cl); - else - send_public_key(cl); + /* Run MST before or after we tell the rest? */ + + mst_kruskal(); + sssp_bfs(0); cp return 0; } -int public_key_h(conn_list_t *cl) +int send_del_edge(connection_t *c, edge_t *e) { - char *g_n; - conn_list_t *old; cp - if(sscanf(cl->buffer, "%*d %as", &g_n) != 1) + return send_request(c, "%d %s %s %lx %d", DEL_EDGE, + e->from->name, e->to->name, e->options, e->weight); +} + +int del_edge_h(connection_t *c) +{ + edge_t *e; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + node_t *from, *to; + long int options; + int weight; + connection_t *other; + avl_node_t *node; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" %lx %d", from_name, to_name, &options, &weight) != 4) { - syslog(LOG_ERR, _("Got bad PUBLIC_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_EDGE", + c->name, c->hostname); + return -1; + } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PUBLIC_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + /* Check if names are valid */ - if(verify_passphrase(cl, g_n)) + if(check_id(from_name)) { - /* intruder! */ - syslog(LOG_ERR, _("Intruder from %s: passphrase for %s does not match!"), - cl->real_hostname, cl->vpn_hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); return -1; } - if(cl->status.outgoing) - send_public_key(cl); - else + if(check_id(to_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } + + /* Lookup nodes */ + + from = lookup_node(from_name); + + if(!from) { - send_ack(cl); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown node")); + 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. - */ + to = lookup_node(to_name); + + if(!to) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown node")); + return -1; + } - while((old = lookup_conn(cl->vpn_ip))) + /* Check if edge exists */ + + e = lookup_edge(from, to); + + if(e) + { + if(e->weight != weight || e->options != options) { - if(debug_lvl > 1) - syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"), - cl->vpn_hostname, old->real_hostname, cl->real_hostname); - old->status.active = 0; - terminate_connection(old); + syslog(LOG_ERR, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + return -1; } - - cl->status.active = 1; + } + else + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown edge")); + return -1; + } - if(debug_lvl > 0) - syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), - cl->vpn_hostname, cl->real_hostname); + /* Tell the rest about the deleted edge */ - notify_others(cl, NULL, send_add_host); - notify_one(cl); + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_del_edge(other, e); } -cp - return 0; -} -int ack_h(conn_list_t *cl) -{ -cp - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ACK from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + /* Delete the edge */ - cl->status.active = 1; + edge_del(e); - if(debug_lvl > 0) - syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), - cl->vpn_hostname, cl->real_hostname); + /* Run MST before or after we tell the rest? */ - notify_others(cl, NULL, send_add_host); - notify_one(cl); - - upstreamindex = 0; + mst_kruskal(); + sssp_bfs(1); cp return 0; } -int termreq_h(conn_list_t *cl) + +/* Status and error notification routines */ + +int send_status(connection_t *c, int statusno, char *statusstring) { cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized TERMREQ from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got TERMREQ from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - - cl->status.termreq = 1; - - terminate_connection(cl); + if(!statusstring) + statusstring = status_text[statusno]; cp - return 0; + return send_request(c, "%d %d %s", STATUS, statusno, statusstring); } -int timeout_h(conn_list_t *cl) +int status_h(connection_t *c) { + int statusno; + char statusstring[MAX_STRING_SIZE]; cp - if(!cl->status.active) + if(sscanf(c->buffer, "%*d %d "MAX_STRING, &statusno, statusstring) != 2) { - syslog(LOG_ERR, _("Got unauthorized TIMEOUT from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "STATUS", + c->name, c->hostname); + return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got TIMEOUT from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + if(debug_lvl >= DEBUG_STATUS) + { + syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"), + c->name, c->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 *c, 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 %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } + if(!errstring) + errstring = strerror(err); + return send_request(c, "%d %d %s", ERROR, err, errstring); +} - if(sscanf(cl->buffer, "%*d %lx", &vpn_ip) != 1) +int error_h(connection_t *c) +{ + int err; + char errorstring[MAX_STRING_SIZE]; +cp + if(sscanf(c->buffer, "%*d %d "MAX_STRING, &err, errorstring) != 2) { - syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ERROR", + c->name, c->hostname); return -1; - } - - if(!(fw = lookup_conn(vpn_ip))) - { - syslog(LOG_ERR, _("Got DEL_HOST for %d.%d.%d.%d from %s (%s) which does not exist?"), - IP_ADDR_V(vpn_ip), cl->vpn_hostname, cl->real_hostname); - return 0; } - /* Connections lists are really messed up if this happens */ - if(vpn_ip == myself->vpn_ip) + if(debug_lvl >= DEBUG_ERROR) { - syslog(LOG_ERR, _("Warning: got DEL_HOST from %s (%s) for ourself, restarting"), - cl->vpn_hostname, cl->real_hostname); - sighup = 1; - return 0; + syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"), + c->name, c->hostname, strerror(err), errorstring); } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got DEL_HOST for %s (%s) from %s (%s)"), - fw->vpn_hostname, fw->real_hostname, cl->vpn_hostname, cl->real_hostname); - - notify_others(fw, cl, send_del_host); - - fw->status.termreq = 1; - fw->status.active = 0; - - terminate_connection(fw); + terminate_connection(c, c->status.active); cp return 0; } -int tcppacket_h(conn_list_t *cl) +int send_termreq(connection_t *c) { - real_packet_t rp; - int len, count = 0, result; - conn_list_t *f; cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized PACKET from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(sscanf(cl->buffer, "%*d %d", &len) != 1) - { - syslog(LOG_ERR, _("Got bad PACKET from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - if(len>1600) - { - syslog(LOG_ERR, _("Got too big PACKET from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - - /* Evil kludge comming up */ - while(len) - { - syslog(LOG_DEBUG, _("Direct read count=%d len=%d rp=%p socket=%d"), count, len, ((char *)&rp)+count, cl->meta_socket); - result=read(cl->meta_socket,((char *)&rp)+count,len); - if(result<0) - { - syslog(LOG_ERR, _("Error while receiving PACKET data from %s (%s): %m"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - count+=result; - len-=result; - } - - if(debug_lvl > 3) - syslog(LOG_DEBUG, _("Got PACKET length %d from %s (%s)"), len, - cl->vpn_hostname, cl->real_hostname); - - total_socket_in += len; - - rp.data.len = ntohs(rp.data.len); - rp.len = ntohs(rp.len); - rp.from = ntohl(rp.from); - - if(rp.len >= 0) - { - f = lookup_conn(rp.from); - if(!f) - { - syslog(LOG_ERR, _("Got packet from %s (%s) with unknown origin %d.%d.%d.%d?"), - cl->vpn_hostname, cl->real_hostname, IP_ADDR_V(rp.from)); - return -1; - } - - if(f->status.validkey) - xrecv(f, &rp); - else - { - add_queue(&(f->rq), &rp, rp.len); - if(!cl->status.waitingforkey) - send_key_request(rp.from); - } + return send_request(c, "%d", TERMREQ); +} - if(my_key_expiry <= time(NULL)) - regenerate_keys(); - } +int termreq_h(connection_t *c) +{ +cp + terminate_connection(c, c->status.active); cp return 0; } - -int ping_h(conn_list_t *cl) +int send_ping(connection_t *c) { + char salt[SALTLEN*2+1]; cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized PING from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } + c->status.pinged = 1; + c->last_ping_time = time(NULL); + RAND_pseudo_bytes(salt, SALTLEN); + bin2hex(salt, salt, SALTLEN); + salt[SALTLEN*2] = '\0'; +cp + return send_request(c, "%d %s", PING, salt); +} - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got PING from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); +int ping_h(connection_t *c) +{ +cp + return send_pong(c); +} - cl->status.pinged = 0; - cl->status.got_pong = 1; +int send_pong(connection_t *c) +{ + char salt[SALTLEN*2+1]; +cp + RAND_pseudo_bytes(salt, SALTLEN); + bin2hex(salt, salt, SALTLEN); + salt[SALTLEN*2] = '\0'; +cp + return send_request(c, "%d %s", PONG, salt); +} - send_pong(cl); +int pong_h(connection_t *c) +{ +cp + c->status.pinged = 0; cp return 0; } -int pong_h(conn_list_t *cl) +/* Key exchange */ + +int send_key_changed(connection_t *c, node_t *n) { + connection_t *other; + avl_node_t *node; cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized PONG from %s (%s)"), - cl->vpn_hostname, cl->real_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 %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + if(n == myself && !mykeyused) + return 0; - cl->status.got_pong = 1; + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other != c && other->status.active) + send_request(other, "%d %s", KEY_CHANGED, n->name); + } cp return 0; } -int add_host_h(conn_list_t *cl) +int key_changed_h(connection_t *c) { - ip_t real_ip; - ip_t vpn_ip; - ip_t vpn_mask; - unsigned short port; - int flags; - conn_list_t *ncn, *old; + char name[MAX_STRING_SIZE]; + node_t *n; cp - if(!cl->status.active) + if(sscanf(c->buffer, "%*d "MAX_STRING, name) != 1) { - syslog(LOG_ERR, _("Got unauthorized ADD_HOST from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED", + c->name, c->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 %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } - if((old = lookup_conn(vpn_ip))) - { - if((real_ip==old->real_ip) && (vpn_mask==old->vpn_mask) && (port==old->port)) - { - if(debug_lvl>1) - syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"), - old->vpn_hostname, old->real_hostname, cl->vpn_hostname, cl->real_hostname); - goto skip_add_host; /* One goto a day keeps the deeply nested if constructions away. */ - } - else - { - if(debug_lvl>1) - syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"), - old->vpn_hostname, old->real_hostname); - old->status.active = 0; - terminate_connection(old); - } - } - - /* Connections lists are really messed up if this happens */ - if(vpn_ip == myself->vpn_ip) + n = lookup_node(name); + + if(!n) { - syslog(LOG_ERR, _("Warning: got ADD_HOST from %s (%s) for ourself, restarting"), - cl->vpn_hostname, cl->real_hostname); - sighup = 1; - return 0; + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED", + c->name, c->hostname, name); + return -1; } - - ncn = new_conn_list(); - ncn->real_ip = real_ip; - ncn->real_hostname = hostlookup(htonl(real_ip)); - ncn->vpn_ip = vpn_ip; - ncn->vpn_mask = vpn_mask; - ncn->vpn_hostname = hostlookup(htonl(vpn_ip)); - 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 %s (%s) from %s (%s)"), - ncn->vpn_hostname, ncn->real_hostname, cl->vpn_hostname, cl->real_hostname); - - notify_others(ncn, cl, send_add_host); - -skip_add_host: + + n->status.validkey = 0; + n->status.waitingforkey = 0; + + send_key_changed(c, n); cp return 0; } -int req_key_h(conn_list_t *cl) +int send_req_key(connection_t *c, node_t *from, node_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 %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } + return send_request(c, "%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 *c) +{ + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + node_t *from, *to; + char key[MAX_STRING_SIZE]; +cp + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) { - syslog(LOG_ERR, _("Got bad REQ_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY", + c->name, c->hostname); return -1; - } - - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got REQ_KEY origin %d.%d.%d.%d destination %d.%d.%d.%d from %s (%s)"), - IP_ADDR_V(from), IP_ADDR_V(to), cl->vpn_hostname, cl->real_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) + from = lookup_node(from_name); + + if(!from) { - syslog(LOG_ERR, _("Attempting to forward REQ_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "REQ_KEY", + c->name, c->hostname, from_name); return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Forwarding REQ_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); - - cl->buffer[cl->reqlen-1] = '\n'; + to = lookup_node(to_name); - if(write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen) < 0) + if(!to) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); + syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "REQ_KEY", + c->name, c->hostname, to_name); return -1; } -cp - return 0; -} -void set_keys(conn_list_t *cl, int expiry, char *key) -{ - char *ek; -cp - if(!cl->public_key) + /* Check if this key request is for us */ + + if(to == myself) /* Yes, send our own key back */ { - cl->public_key = xmalloc(sizeof(*cl->key)); - cl->public_key->key = NULL; + bin2hex(myself->key, key, myself->keylength); + key[myself->keylength * 2] = '\0'; + send_ans_key(c, myself, from, key); + mykeyused = 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) + else { - cl->key = xmalloc(sizeof(*cl->key)); - cl->key->key = NULL; + if(to->status.validkey) /* Proxy keys */ + { + bin2hex(to->key, key, to->keylength); + key[to->keylength * 2] = '\0'; + send_ans_key(c, to, from, key); + } + else + send_req_key(to->nexthop->connection, from, to); } - if(cl->key->key) - free(cl->key->key); +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(connection_t *c, node_t *from, node_t *to, char *key) +{ cp + return send_request(c, "%d %s %s %s", ANS_KEY, + from->name, to->name, key); } -int ans_key_h(conn_list_t *cl) +int ans_key_h(connection_t *c) { - ip_t to; - ip_t from; - int expiry; - char *key; - conn_list_t *fw, *gk; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + char key[MAX_STRING_SIZE]; + int keylength; + node_t *from, *to; cp - if(!cl->status.active) + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING, from_name, to_name, key) != 3) { - syslog(LOG_ERR, _("Got unauthorized ANS_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", + c->name, c->hostname); + return -1; } - if(sscanf(cl->buffer, "%*d %lx %lx %d %as", &to, &from, &expiry, &key) != 4) + from = lookup_node(from_name); + + if(!from) { - syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist in our connection list"), "ANS_KEY", + c->name, c->hostname, from_name); + return -1; + } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got ANS_KEY origin %d.%d.%d.%d destination %d.%d.%d.%d from %s (%s)"), - IP_ADDR_V(from), IP_ADDR_V(to), cl->vpn_hostname, cl->real_hostname); + to = lookup_node(to_name); - if(to == myself->vpn_ip) - { /* hey! that key's for ME! :) */ - gk = lookup_conn(from); + if(!to) + { + syslog(LOG_ERR, _("Got %s from %s (%s) destination %s which does not exist in our connection list"), "ANS_KEY", + c->name, c->hostname, to_name); + return -1; + } - if(!gk) - { - syslog(LOG_ERR, _("Receiving ANS_KEY origin %d.%d.%d.%d from %s (%s), which does not exist?"), - IP_ADDR_V(from), cl->vpn_hostname, cl->real_hostname); - return -1; - } + /* Check correctness of packet key */ - set_keys(gk, expiry, key); - gk->status.validkey = 1; - gk->status.waitingforkey = 0; - flush_queues(gk); - return 0; - } + keylength = strlen(key); - fw = lookup_conn(to); - - if(!fw) + if(keylength != from->keylength * 2) { - syslog(LOG_ERR, _("Attempting to forward ANS_KEY to %d.%d.%d.%d, which does not exist?"), - IP_ADDR_V(to)); + syslog(LOG_ERR, _("Got bad %s from %s (%s) origin %s: %s"), "ANS_KEY", + c->name, c->hostname, from->name, _("invalid key length")); return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Forwarding ANS_KEY to %s (%s)"), - fw->nexthop->vpn_hostname, fw->nexthop->real_hostname); - - cl->buffer[cl->reqlen-1] = '\n'; + /* Forward it if necessary */ - if((write(fw->nexthop->meta_socket, cl->buffer, cl->reqlen)) < 0) + if(to != myself) { - syslog(LOG_ERR, _("Send failed: %s:%d: %m"), __FILE__, __LINE__); - return -1; + send_ans_key(to->nexthop->connection, from, to, key); } + + /* Update our copy of the origin's packet key */ + + if(from->key) + free(from->key); + + from->key = xstrdup(key); + keylength /= 2; + hex2bin(from->key, from->key, keylength); + from->key[keylength] = '\0'; + + 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 *c, vpn_packet_t *packet) { - ip_t from; - conn_list_t *ik; -cp - if(!cl->status.active) - { - syslog(LOG_ERR, _("Got unauthorized KEY_CHANGED from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } + int x; +cp + /* Evil hack. */ - if(sscanf(cl->buffer, "%*d %lx", &from) != 1) - { - syslog(LOG_ERR, _("Got bad KEY_CHANGED from %s (%s)"), - cl->vpn_hostname, cl->real_hostname); - return -1; - } + x = send_request(c, "%d %hd", PACKET, packet->len); - ik = lookup_conn(from); + if(x) + return x; +cp + return send_meta(c, packet->data, packet->len); +} - if(!ik) +int tcppacket_h(connection_t *c) +{ + short int len; +cp + if(sscanf(c->buffer, "%*d %hd", &len) != 1) { - syslog(LOG_ERR, _("Got KEY_CHANGED origin %d.%d.%d.%d from %s (%s), which does not exist?"), - IP_ADDR_V(from), cl->vpn_hostname, cl->real_hostname); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "PACKET", c->name, c->hostname); return -1; } - if(debug_lvl > 1) - syslog(LOG_DEBUG, _("Got KEY_CHANGED origin %s from %s (%s)"), - ik->vpn_hostname, cl->vpn_hostname, cl->real_hostname); - - 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); + c->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, - tcppacket_h, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - req_key_h, ans_key_h, key_changed_h, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0 +/* Jumptable for the request handlers */ + +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_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", "METAKEY", "CHALLENGE", "CHAL_REPLY", "ACK", + "STATUS", "ERROR", "TERMREQ", + "PING", "PONG", + "ADD_NODE", "DEL_NODE", + "ADD_SUBNET", "DEL_SUBNET", + "ADD_EDGE", "DEL_EDGE", + "KEY_CHANGED", "REQ_KEY", "ANS_KEY", + "PACKET", +}; + +/* Status strings */ + +char (*status_text[]) = { + "Warning", +}; + +/* Error strings */ + +char (*error_text[]) = { + "Error", };