X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fprotocol.c;h=a3fa5f1a402d0e2800059f202ad21193dcec58b2;hp=2f27b553c638609bfda8f0984c83eca318623c9a;hb=b2d5002ff1ccd44fbf3a94e4c41909ab6141f3bb;hpb=44f9449888344866406c75b178eff83b392b3530 diff --git a/src/protocol.c b/src/protocol.c index 2f27b553..32bca999 100644 --- a/src/protocol.c +++ b/src/protocol.c @@ -1,6 +1,7 @@ /* protocol.c -- handle the meta-protocol - Copyright (C) 1999 Ivo Timmermans + 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 @@ -15,774 +16,1541 @@ You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + + $Id: protocol.c,v 1.28.4.120 2001/11/04 23:48:27 guus Exp $ */ #include "config.h" +#include + #include #include #include #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" + +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; +} + +/* Generic request routines - takes care of logging and error + detection as well */ + +int send_request(connection_t *c, const char *format, ...) +{ + va_list args; + char buffer[MAXBUFSIZE]; + int len, request; + +cp + /* Use vsnprintf instead of vasprintf: faster, no memory + fragmentation, cleanup is automatic, and there is a limit on the + input buffer anyway */ + + va_start(args, format); + len = vsnprintf(buffer, MAXBUFSIZE, format, args); + request = va_arg(args, int); + va_end(args); + + if(len < 0 || len > MAXBUFSIZE-1) + { + 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 send_meta(c, buffer, len); +} -int send_ack(conn_list_t *cl) +int receive_request(connection_t *c) { - unsigned char tmp = ACK; + int request; cp - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Send ACK to %s", cl->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); + } + } + + if((c->allow_request != ALL) && (c->allow_request != request)) + { + syslog(LOG_ERR, _("Unauthorized request from %s (%s)"), c->name, c->hostname); + return -1; + } - syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname); - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 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 { - syslog(LOG_ERR, "send failed: %d:%d: %m", __FILE__, __LINE__); + syslog(LOG_ERR, _("Bogus data received from %s (%s)"), + c->name, c->hostname); return -1; } cp return 0; } -int send_termreq(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 + 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); + + if((bla = read_connection_config(c))) + { + syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname, c->name); + return -1; + } + } + + if(read_rsa_public_key(c)) + { + return -1; + } + + c->allow_request = METAKEY; +cp + return send_metakey(c); +} + +int send_metakey(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len, x; +cp + len = RSA_size(c->rsa_key); + + /* Allocate buffers for the meta key */ + + 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); + } + + /* 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, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname); + return -1; + } +cp + /* Convert the encrypted random data to a hexadecimal formatted string */ + + bin2hex(buffer, buffer, len); + buffer[len*2] = '\0'; + + /* Send the meta key */ + + x = send_request(c, "%d %s", METAKEY, 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; +} + +int metakey_h(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len; +cp + 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; + } +cp + len = RSA_size(myself->connection->rsa_key); + + /* Check if the length of the meta key is all right */ + + if(strlen(buffer) != len*2) + { + syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength"); + return -1; + } + + /* Allocate buffers for the meta key */ +cp + if(!c->inkey) + c->inkey = xmalloc(len); + + if(!c->inctx) + c->inctx = xmalloc(sizeof(*c->inctx)); + + /* Convert the challenge from hexadecimal back to binary */ +cp + hex2bin(buffer,buffer,len); + + /* Decrypt the meta key */ +cp + if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */ + { + 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. */ +cp + 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 send_challenge(c); +} + +int send_challenge(connection_t *c) { - termreq_t tmp; + char buffer[MAX_STRING_SIZE]; + int len, x; cp - tmp.type = TERMREQ; - tmp.vpn_ip = myself->vpn_ip; + /* CHECKME: what is most reasonable value for len? */ + + len = RSA_size(c->rsa_key); + + /* Allocate buffers for the challenge */ + + if(!c->hischallenge) + c->hischallenge = xmalloc(len); +cp + /* 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); +cp + return x; +} + +int challenge_h(connection_t *c) +{ + char buffer[MAX_STRING_SIZE]; + int len; +cp + 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); - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Send TERMREQ(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip), - IP_ADDR_V(cl->vpn_ip)); + /* Check if the length of the challenge is all right */ - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 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 send_chal_reply(c); +} + +int send_chal_reply(connection_t *c) +{ + char hash[SHA_DIGEST_LENGTH*2+1]; +cp + /* 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) + { + 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; + } + + /* Convert the hash to binary format */ + + hex2bin(hishash, hishash, SHA_DIGEST_LENGTH); + + /* 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, _("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 send_ack(c); +} + +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 + 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 */ + + 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 */ + + node_add(n); + } + else + { + 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->status.active && other != c) + { + 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; +} + + + +/* Address and subnet information exchange */ + +int send_add_subnet(connection_t *c, subnet_t *subnet) +{ + int x; + char *netstr; +cp + x = send_request(c, "%d %s %s", ADD_SUBNET, + subnet->owner->name, netstr = net2str(subnet)); + free(netstr); +cp + return x; +} + +int add_subnet_h(connection_t *c) +{ + 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; + } + + /* Check if subnet string is valid */ + + if(!(s = str2net(subnetstr))) + { + 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 */ + + owner = lookup_node(name); + + if(!owner) + { + syslog(LOG_ERR, _("Got ADD_SUBNET from %s (%s) for %s which is not in our connection list"), + c->name, c->hostname, name); + return -1; + } + + /* Check if we already know this subnet */ + + if(lookup_subnet(owner, s)) + { + free_subnet(s); + return 0; + } + + /* 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_del_subnet(connection_t *c, subnet_t *s) +{ + int x; + char *netstr; +cp + 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(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 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; + } + + /* 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; + } + + /* If everything is correct, delete the subnet from the list of the owner */ + + find = lookup_subnet(owner, s); + + free_subnet(s); + + if(!find) + { + 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, find); + + /* 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; +} + +/* New and closed connections notification */ + +int send_add_node(connection_t *c, node_t *n) +{ cp - return 0; + return send_request(c, "%d %s %lx:%d", ADD_NODE, + n->name, n->address, n->port); } -int send_timeout(conn_list_t *cl) +int add_node_h(connection_t *c) { - termreq_t tmp; + connection_t *other; + node_t *n; + char name[MAX_STRING_SIZE]; + ipv4_t address; + port_t port; + avl_node_t *node; cp - tmp.type = PINGTIMEOUT; - tmp.vpn_ip = myself->vpn_ip; + 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; + } - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Send TIMEOUT(" IP_ADDR_S ") to " IP_ADDR_S, IP_ADDR_V(tmp.vpn_ip), - IP_ADDR_V(cl->vpn_ip)); + /* Check if identity is a valid name */ - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 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; } -cp - return 0; -} -int send_del_host(conn_list_t *cl, conn_list_t *new_host) -{ - del_host_t tmp; -cp - tmp.type = DEL_HOST; - tmp.vpn_ip = new_host->vpn_ip; + /* Check if node already exists */ + + n = lookup_node(name); + + if(n) + { + /* Check if it matches */ - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Sending delete host %lx to " IP_ADDR_S, - tmp.vpn_ip, IP_ADDR_V(cl->vpn_ip)); + 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); - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) + return 0; + } + else { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); - return -1; + n = new_node(); + n->name = xstrdup(name); + n->address = address; + n->port = port; + node_add(n); } -cp - return 0; -} -int send_ping(conn_list_t *cl) -{ - unsigned char tmp = PING; -cp - if(debug_lvl > 3) - syslog(LOG_DEBUG, "pinging " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); + /* Tell the rest about the new node */ - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 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_add_node(other, n); } + cp return 0; } -int send_pong(conn_list_t *cl) +int send_del_node(connection_t *c, node_t *n) { - unsigned char tmp = PONG; cp - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 0) - { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); - return -1; - } -cp - return 0; + return send_request(c, "%d %s %lx:%d", DEL_NODE, + n->name, n->address, n->port); } -int send_add_host(conn_list_t *cl, conn_list_t *new_host) +int del_node_h(connection_t *c) { - add_host_t tmp; + node_t *n; + char name[MAX_STRING_SIZE]; + ipv4_t address; + port_t port; + connection_t *other; + avl_node_t *node; cp - tmp.type = ADD_HOST; - tmp.real_ip = new_host->real_ip; - tmp.vpn_ip = new_host->vpn_ip; - tmp.vpn_mask = new_host->vpn_mask; - tmp.portnr = new_host->port; + if(sscanf(c->buffer, "%*d "MAX_STRING" %lx:%hd", name, &address, &port) != 3) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "DEL_NODE", + c->name, c->hostname); + return -1; + } - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Sending add host (%lx/%lx %lx:%hd) to " IP_ADDR_S, - tmp.vpn_ip, tmp.vpn_mask, tmp.real_ip, tmp.portnr, - IP_ADDR_V(cl->vpn_ip)); + /* Check if identity is a valid name */ - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 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"), "DEL_NODE", c->name, c->hostname, _("invalid name")); return -1; } -cp - return 0; -} - -int send_key_changed(conn_list_t *cl, conn_list_t *src) -{ - key_changed_t tmp; -cp - tmp.type = KEY_CHANGED; - tmp.from = src->vpn_ip; - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Sending KEY_CHANGED (%lx) to " IP_ADDR_S, - tmp.from, IP_ADDR_V(cl->vpn_ip)); + /* Check if somebody tries to delete ourself */ - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 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; } -cp - return 0; -} -void send_key_changed2(void) -{ - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - if(p->status.meta && p->protocol_version > PROT_3) - send_key_changed(p, myself); -cp -} + /* Check if the deleted host exists */ -int send_basic_info(conn_list_t *cl) -{ - basic_info_t tmp; -cp - tmp.type = BASIC_INFO; - tmp.protocol = PROT_CURRENT; + n = lookup_node(name); - tmp.portnr = myself->port; - tmp.vpn_ip = myself->vpn_ip; - tmp.vpn_mask = myself->vpn_mask; + 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; + } + + /* Check if the rest matches */ + + if(address != n->address || port != n->port) + { + 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 > 2) - syslog(LOG_DEBUG, "Send BASIC_INFO(%d,%hd," IP_ADDR_S "," IP_ADDR_S ") to " IP_ADDR_S, - tmp.protocol, tmp.portnr, IP_ADDR_V(tmp.vpn_ip), IP_ADDR_V(tmp.vpn_mask), - IP_ADDR_V(cl->real_ip)); + /* Tell the rest about the deleted node */ - if((write(cl->meta_socket, &tmp, sizeof(tmp))) < 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; } -int send_passphrase(conn_list_t *cl) -{ - passphrase_t tmp; -cp - tmp.type = PASSPHRASE; - encrypt_passphrase(&tmp); - - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Send PASSPHRASE(%hd,...) to " IP_ADDR_S, tmp.len, - IP_ADDR_V(cl->vpn_ip)); +/* Edges */ - if((write(cl->meta_socket, &tmp, tmp.len+3)) < 0) - { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); - return -1; - } +int send_add_edge(connection_t *c, edge_t *e) +{ cp - return 0; + return send_request(c, "%d %s %s %lx %d", ADD_EDGE, + e->from->name, e->to->name, e->options, e->weight); } -int send_public_key(conn_list_t *cl) +int add_edge_h(connection_t *c) { - public_key_t *tmp; + 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 - tmp = (public_key_t*)xmalloc(strlen(my_public_key_base36)+sizeof(*tmp)); - tmp->type = PUBLIC_KEY; - tmp->len = strlen(my_public_key_base36); - strcpy(&tmp->key, my_public_key_base36); + 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; + } - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Send PUBLIC_KEY(%hd,%s) to " IP_ADDR_S, tmp->len, &tmp->key, - IP_ADDR_V(cl->vpn_ip)); + /* Check if names are valid */ - if((write(cl->meta_socket, tmp, tmp->len+sizeof(*tmp))) < 0) + if(check_id(from_name)) { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); return -1; } -cp - return 0; -} - -int send_calculate(conn_list_t *cl, char *k) -{ - calculate_t *tmp; -cp - tmp = xmalloc(strlen(k)+sizeof(*tmp)); - tmp->type = CALCULATE; - tmp->len = strlen(k); - strcpy(&tmp->key, k); - if((write(cl->meta_socket, tmp, tmp->len+sizeof(*tmp))) < 0) + if(check_id(to_name)) { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("invalid name")); return -1; } -cp - return 0; -} -int send_key_request(ip_t to) -{ - key_req_t *tmp; - conn_list_t *fw; -cp - tmp = xmalloc(sizeof(*tmp)); - tmp->type = REQ_KEY; - tmp->to = to; - tmp->from = myself->vpn_ip; - tmp->len = 0; + /* Lookup nodes */ - fw = lookup_conn(to); - if(!fw) + from = lookup_node(from_name); + + if(!from) { - syslog(LOG_ERR, "Attempting to send key request to " IP_ADDR_S ", which does not exist?", - IP_ADDR_V(to)); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("unknown node")); return -1; } - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Sending out request for public key to " IP_ADDR_S, - IP_ADDR_V(fw->nexthop->vpn_ip)); - if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)) < 0) + to = lookup_node(to_name); + + if(!to) { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ADD_EDGE", c->name, c->hostname, _("unknown node")); return -1; } - fw->status.waitingforkey = 1; -cp - return 0; -} -int send_key_answer(conn_list_t *cl, ip_t to) -{ - key_req_t *tmp; - conn_list_t *fw; -cp - tmp = xmalloc(sizeof(*tmp)+strlen(my_public_key_base36)); - tmp->type = ANS_KEY; - tmp->to = to; - tmp->from = myself->vpn_ip; - tmp->expiry = my_key_expiry; - tmp->len = strlen(my_public_key_base36); - strcpy(&tmp->key, my_public_key_base36); - - fw = lookup_conn(to); + /* Check if edge already exists */ - if(!fw) - { - syslog(LOG_ERR, "Attempting to send key answer to " IP_ADDR_S ", which does not exist?", - IP_ADDR_V(to)); - return -1; - } + e = lookup_edge(from, to); - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Sending public key to " IP_ADDR_S, - IP_ADDR_V(fw->nexthop->vpn_ip)); - if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)+tmp->len) < 0) + if(e) { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); - return -1; + if(e->weight != weight || e->options != options) + { + syslog(LOG_ERR, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + return -1; + } + + return 0; + } + else + { + e = new_edge(); + e->from = from; + e->to = to; + e->options = options; + e->weight = weight; + edge_add(e); + } + + /* Tell the rest about the new edge */ + + for(node = connection_tree->head; node; node = node->next) + { + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_add_edge(other, e); } + + /* Run MST before or after we tell the rest? */ + + 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*)) +int send_del_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->protocol_version > PROT_3) - function(p, new); cp - return 0; + return send_request(c, "%d %s %s %lx %d", DEL_EDGE, + 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 del_edge_h(connection_t *c) { - conn_list_t *p; -cp - for(p = conn_list; p != NULL; p = p->next) - if(p != new && p->protocol_version > PROT_3) - send_add_host(new, p); + 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 - return 0; -} + 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)"), "DEL_EDGE", + c->name, c->hostname); + return -1; + } -/* - The incoming request handlers -*/ + /* Check if names are valid */ -int basic_info_h(conn_list_t *cl, unsigned char *d, int len) -{ - basic_info_t *tmp = (basic_info_t*)d; -cp - cl->protocol_version = tmp->protocol; - cl->port = tmp->portnr; - cl->vpn_ip = tmp->vpn_ip; - cl->vpn_mask = tmp->vpn_mask; + if(check_id(from_name)) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); + return -1; + } - if(cl->protocol_version < PROT_CURRENT) + if(check_id(to_name)) { - syslog(LOG_ERR, "Peer uses protocol version %d which is too old.", - cl->protocol_version); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("invalid name")); return -1; } - if(debug_lvl > 2) - syslog(LOG_DEBUG, "got BASIC_INFO(%hd," IP_ADDR_S "," IP_ADDR_S ")", cl->port, - IP_ADDR_V(cl->vpn_ip), IP_ADDR_V(cl->vpn_mask)); - if(debug_lvl > 1) - syslog(LOG_DEBUG, "Peer uses protocol version %d", - cl->protocol_version); + /* Lookup nodes */ + + from = lookup_node(from_name); + + if(!from) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown node")); + return 0; + } + + 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 0; + } - if(cl->status.outgoing) + /* Check if edge exists */ + + e = lookup_edge(from, to); + + if(e) { - if(setup_vpn_connection(cl) < 0) - return -1; - send_basic_info(cl); + if(e->weight != weight || e->options != options) + { + syslog(LOG_ERR, _("Got %s from %s (%s) which does not match existing entry"), "ADD_EDGE", c->name, c->hostname); + return -1; + } } else { - if(setup_vpn_connection(cl) < 0) - return -1; - send_passphrase(cl); + syslog(LOG_ERR, _("Got bad %s from %s (%s): %s"), "DEL_EDGE", c->name, c->hostname, _("unknown edge")); + return 0; + } + + /* Tell the rest about the deleted edge */ + + 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); } - cl->status.active = 0; + /* Delete the edge */ + + edge_del(e); + + /* Run MST before or after we tell the rest? */ + + mst_kruskal(); + sssp_bfs(1); cp return 0; } -int passphrase_h(conn_list_t *cl, unsigned char *d, int len) -{ - passphrase_t *tmp = (passphrase_t*)d; -cp - cl->pp = xmalloc(tmp->len+3); - memcpy(cl->pp, tmp, tmp->len+3); - if(debug_lvl > 2) - syslog(LOG_DEBUG, "got PASSPHRASE(%hd,...)", cl->pp->len); +/* Status and error notification routines */ - if(cl->status.outgoing) - send_passphrase(cl); - else - send_public_key(cl); +int send_status(connection_t *c, int statusno, char *statusstring) +{ cp - return 0; + if(!statusstring) + statusstring = status_text[statusno]; +cp + return send_request(c, "%d %d %s", STATUS, statusno, statusstring); } -int public_key_h(conn_list_t *cl, unsigned char *d, int len) +int status_h(connection_t *c) { - char *g_n; - public_key_t *tmp = (public_key_t*)d; + int statusno; + char statusstring[MAX_STRING_SIZE]; cp - if(debug_lvl > 2) - syslog(LOG_DEBUG, "got PUBLIC_KEY(%hd,%s)", tmp->len, &tmp->key); - - g_n = xmalloc(tmp->len+1); - strcpy(g_n, &tmp->key); - - if(verify_passphrase(cl, g_n)) + if(sscanf(c->buffer, "%*d %d "MAX_STRING, &statusno, statusstring) != 2) { - /* intruder! */ - syslog(LOG_ERR, "Intruder: passphrase does not match."); - return -1; + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "STATUS", + c->name, c->hostname); + return -1; } - if(debug_lvl > 2) - syslog(LOG_INFO, "Passphrase OK"); - - if(cl->status.outgoing) - send_public_key(cl); - else - send_ack(cl); + 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.active = 1; - notify_others(cl, NULL, send_add_host); - notify_one(cl); cp return 0; } -int ack_h(conn_list_t *cl, unsigned char *d, int len) +int send_error(connection_t *c, int err, char *errstring) { cp - if(debug_lvl > 2) - syslog(LOG_DEBUG, "got ACK"); - - cl->status.active = 1; - syslog(LOG_NOTICE, "Connection with %s activated.", cl->hostname); + if(!errstring) + errstring = strerror(err); + return send_request(c, "%d %d %s", ERROR, err, errstring); +} - /* - === FIXME === - Now I'm going to cheat. The meta protocol is actually - a stream of requests, that may come in in the same TCP - packet. This is the only place that it will happen, - though. - I may change it in the future, if it appears that this - is not retainable. - */ - if(len > 1) /* An ADD_HOST follows */ +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 %s from %s (%s)"), "ERROR", + c->name, c->hostname); + return -1; + } + + if(debug_lvl >= DEBUG_ERROR) { - if(request_handlers[d[1]] == NULL) - syslog(LOG_ERR, "Unknown request %d.", d[1]); - if(request_handlers[d[1]](cl, d + 1, len - 1) < 0) - return -1; + syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"), + c->name, c->hostname, strerror(err), errorstring); } + + terminate_connection(c, c->status.active); cp return 0; } -int termreq_h(conn_list_t *cl, unsigned char *d, int len) +int send_termreq(connection_t *c) { cp - syslog(LOG_NOTICE, IP_ADDR_S " wants to quit", IP_ADDR_V(cl->vpn_ip)); - cl->status.termreq = 1; - terminate_connection(cl); - - notify_others(cl, NULL, send_del_host); -cp - return 0; + return send_request(c, "%d", TERMREQ); } -int timeout_h(conn_list_t *cl, unsigned char *d, int len) +int termreq_h(connection_t *c) { cp - syslog(LOG_NOTICE, IP_ADDR_S " says it's gotten a timeout from us", IP_ADDR_V(cl->vpn_ip)); - cl->status.termreq = 1; - terminate_connection(cl); + terminate_connection(c, c->status.active); cp return 0; } -int del_host_h(conn_list_t *cl, unsigned char *d, int len) +int send_ping(connection_t *c) { - del_host_t *tmp = (del_host_t*)d; - conn_list_t *fw; + char salt[SALTLEN*2+1]; cp - if(debug_lvl > 2) - syslog(LOG_DEBUG, "got DEL_HOST for " IP_ADDR_S, - IP_ADDR_V(tmp->vpn_ip)); - - if(!(fw = lookup_conn(tmp->vpn_ip))) - { - syslog(LOG_ERR, "Somebody wanted to delete " IP_ADDR_S " which does not exist?", - IP_ADDR_V(tmp->vpn_ip)); - return 0; - } - - notify_others(cl, fw, send_del_host); - - fw->status.termreq = 1; - terminate_connection(fw); + 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 0; + return send_request(c, "%d %s", PING, salt); } -int ping_h(conn_list_t *cl, unsigned char *d, int len) +int ping_h(connection_t *c) { cp - if(debug_lvl > 3) - syslog(LOG_DEBUG, "responding to ping from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); - cl->status.pinged = 0; - cl->status.got_pong = 1; + return send_pong(c); +} - send_pong(cl); +int send_pong(connection_t *c) +{ + char salt[SALTLEN*2+1]; cp - return 0; + RAND_pseudo_bytes(salt, SALTLEN); + bin2hex(salt, salt, SALTLEN); + salt[SALTLEN*2] = '\0'; +cp + return send_request(c, "%d %s", PONG, salt); } -int pong_h(conn_list_t *cl, unsigned char *d, int len) +int pong_h(connection_t *c) { cp - if(debug_lvl > 3) - syslog(LOG_DEBUG, "ok, got pong from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); - cl->status.got_pong = 1; + c->status.pinged = 0; cp return 0; } -int add_host_h(conn_list_t *cl, unsigned char *d, int len) +/* Key exchange */ + +int send_key_changed(connection_t *c, node_t *n) { - add_host_t *tmp = (add_host_t*)d; - conn_list_t *ncn, *fw; + connection_t *other; + avl_node_t *node; cp - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Add host request from " IP_ADDR_S, IP_ADDR_V(cl->vpn_ip)); - if(debug_lvl > 3) - syslog(LOG_DEBUG, "got ADD_HOST(" IP_ADDR_S "," IP_ADDR_S ",%hd)", - IP_ADDR_V(tmp->vpn_ip), IP_ADDR_V(tmp->vpn_mask), tmp->portnr); - - /* - Suggestion of Hans Bayle + /* Only send this message if some other daemon requested our key previously. + This reduces unnecessary key_changed broadcasts. */ - if((fw = lookup_conn(tmp->vpn_ip))) - { - notify_others(fw, cl, send_add_host); - return 0; - } - ncn = new_conn_list(); - ncn->real_ip = tmp->real_ip; - ncn->vpn_ip = tmp->vpn_ip; - ncn->vpn_mask = tmp->vpn_mask; - ncn->port = tmp->portnr; - ncn->hostname = hostlookup(tmp->real_ip); - ncn->nexthop = cl; - ncn->next = conn_list; - conn_list = ncn; - ncn->status.active = 1; - notify_others(ncn, cl, send_add_host); - - /* - again, i'm cheating here. see the comment in ack_h. - Naughty zarq! Now you see what cheating will get you... [GS] - */ - if(len > sizeof(*tmp)) /* Another ADD_HOST follows */ + if(n == myself && !mykeyused) + return 0; + + for(node = connection_tree->head; node; node = node->next) { - if(request_handlers[d[sizeof(*tmp)]] == NULL) - syslog(LOG_ERR, "Unknown request %d.", d[sizeof(*tmp)]); - if(request_handlers[d[sizeof(*tmp)]](cl, d + sizeof(*tmp), len - sizeof(*tmp)) < 0) - return -1; + other = (connection_t *)node->data; + if(other->status.active && other != c) + send_request(other, "%d %s", KEY_CHANGED, n->name); } cp return 0; } -int req_key_h(conn_list_t *cl, unsigned char *d, int len) +int key_changed_h(connection_t *c) { - key_req_t *tmp = (key_req_t*)d; - conn_list_t *fw; + char name[MAX_STRING_SIZE]; + node_t *n; cp - if(debug_lvl > 2) - syslog(LOG_DEBUG, "got REQ_KEY from " IP_ADDR_S " for " IP_ADDR_S, - IP_ADDR_V(tmp->from), IP_ADDR_V(tmp->to)); - - if((tmp->to & myself->vpn_mask) == (myself->vpn_ip & myself->vpn_mask)) - { /* hey! they want something from ME! :) */ - send_key_answer(cl, tmp->from); - return 0; + if(sscanf(c->buffer, "%*d "MAX_STRING, name) != 1) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "KEY_CHANGED", + c->name, c->hostname); + return -1; } - fw = lookup_conn(tmp->to); - - if(!fw) - { - syslog(LOG_ERR, "Attempting to forward key request to " IP_ADDR_S ", which does not exist?", - IP_ADDR_V(tmp->to)); - return -1; - } + n = lookup_node(name); - if(debug_lvl > 3) - syslog(LOG_DEBUG, "Forwarding request for public key to " IP_ADDR_S, - IP_ADDR_V(fw->nexthop->vpn_ip)); - if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)) < 0) + if(!n) { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); + syslog(LOG_ERR, _("Got %s from %s (%s) origin %s which does not exist"), "KEY_CHANGED", + c->name, c->hostname, name); return -1; } + + n->status.validkey = 0; + n->status.waitingforkey = 0; + + send_key_changed(c, n); cp return 0; } -void set_keys(conn_list_t *cl, key_req_t *k) +int send_req_key(connection_t *c, node_t *from, node_t *to) +{ +cp + return send_request(c, "%d %s %s", REQ_KEY, + from->name, to->name); +} + +int req_key_h(connection_t *c) { - char *ek; + char from_name[MAX_STRING_SIZE]; + char to_name[MAX_STRING_SIZE]; + node_t *from, *to; + char key[MAX_STRING_SIZE]; cp - if(!cl->public_key) + if(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING, from_name, to_name) != 2) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "REQ_KEY", + c->name, c->hostname); + return -1; + } + + from = lookup_node(from_name); + + if(!from) + { + 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; + } + + to = lookup_node(to_name); + + if(!to) { - cl->public_key = xmalloc(sizeof(*cl->key)); - cl->public_key->key = NULL; + 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; } - if(cl->public_key->key) - free(cl->public_key->key); - cl->public_key->length = k->len; - cl->public_key->expiry = k->expiry; - cl->public_key->key = xmalloc(k->len + 1); - strcpy(cl->public_key->key, &(k->key)); - ek = make_shared_key(&(k->key)); - if(!cl->key) + /* Check if this key request is for us */ + + if(to == myself) /* Yes, send our own key back */ { - cl->key = xmalloc(sizeof(*cl->key)); - cl->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->key->key) - free(cl->key->key); - cl->key->length = strlen(ek); - cl->key->expiry = k->expiry; - cl->key->key = xmalloc(strlen(ek) + 1); - strcpy(cl->key->key, ek); + else + { + 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); + } + cp + return 0; } -int ans_key_h(conn_list_t *cl, unsigned char *d, int len) +int send_ans_key(connection_t *c, node_t *from, node_t *to, char *key) { - key_req_t *tmp = (key_req_t*)d; - conn_list_t *fw, *gk; cp - if(debug_lvl > 3) - syslog(LOG_DEBUG, "got ANS_KEY from " IP_ADDR_S " for " IP_ADDR_S, - IP_ADDR_V(tmp->from), IP_ADDR_V(tmp->to)); + return send_request(c, "%d %s %s %s", ANS_KEY, + from->name, to->name, key); +} - if(tmp->to == myself->vpn_ip) - { /* hey! that key's for ME! :) */ - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Yeah! key arrived. Now do something with it."); - gk = lookup_conn(tmp->from); +int ans_key_h(connection_t *c) +{ + 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(sscanf(c->buffer, "%*d "MAX_STRING" "MAX_STRING" "MAX_STRING, from_name, to_name, key) != 3) + { + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ANS_KEY", + c->name, c->hostname); + return -1; + } - if(!gk) - { - syslog(LOG_ERR, "Receiving key from " IP_ADDR_S ", which does not exist?", - IP_ADDR_V(tmp->from)); - return -1; - } + from = lookup_node(from_name); - set_keys(gk, tmp); - gk->status.validkey = 1; - gk->status.waitingforkey = 0; - flush_queues(gk); - return 0; + if(!from) + { + 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; } - fw = lookup_conn(tmp->to); - - if(!fw) - { - syslog(LOG_ERR, "Attempting to forward key to " IP_ADDR_S ", which does not exist?", - IP_ADDR_V(tmp->to)); - return -1; - } + to = lookup_node(to_name); + + 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; + } + + /* Check correctness of packet key */ - if(debug_lvl > 2) - syslog(LOG_DEBUG, "Forwarding public key to " IP_ADDR_S, - IP_ADDR_V(fw->nexthop->vpn_ip)); - if(write(fw->nexthop->meta_socket, tmp, sizeof(*tmp)+tmp->len) < 0) + keylength = strlen(key); + + if(keylength != from->keylength * 2) { - syslog(LOG_ERR, "send failed: %s:%d: %m", __FILE__, __LINE__); + 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; } + + /* Forward it if necessary */ + + if(to != myself) + { + 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, unsigned char *d, int len) +int send_tcppacket(connection_t *c, vpn_packet_t *packet) { - key_changed_t *tmp = (key_changed_t*)d; - conn_list_t *ik; -cp - if(debug_lvl > 2) - syslog(LOG_DEBUG, "got KEY_CHANGED from " IP_ADDR_S, - IP_ADDR_V(tmp->from)); + int x; +cp + /* Evil hack. */ + + x = send_request(c, "%d %hd", PACKET, packet->len); - ik = lookup_conn(tmp->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 changed key from " IP_ADDR_S ", which does not exist?", - IP_ADDR_V(tmp->from)); + syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "PACKET", c->name, c->hostname); return -1; } - ik->status.validkey = 0; - ik->status.waitingforkey = 0; - - if(debug_lvl > 3) - syslog(LOG_DEBUG, "Forwarding key invalidation request"); + /* Set reqlen to len, this will tell receive_meta() that a tcppacket is coming. */ - notify_others(cl, ik, send_key_changed); + c->tcplen = len; cp return 0; } -int (*request_handlers[256])(conn_list_t*, unsigned char*, int) = { - 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, 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", };