X-Git-Url: https://tinc-vpn.org/git/browse?a=blobdiff_plain;f=src%2Fnet_setup.c;h=17eaec2b7475be8ec88b5ccae689cdecec68de6b;hb=5a132550deb58473285e5f91705d286aef47be71;hp=aa2fbfbe9264b921b56553aca7fc150846c751e4;hpb=42e01abd54bd36ee84a45a2b646cfa27034de8d1;p=tinc diff --git a/src/net_setup.c b/src/net_setup.c index aa2fbfbe..17eaec2b 100644 --- a/src/net_setup.c +++ b/src/net_setup.c @@ -1,7 +1,7 @@ /* net_setup.c -- Setup. - Copyright (C) 1998-2003 Ivo Timmermans , - 2000-2003 Guus Sliepen + Copyright (C) 1998-2005 Ivo Timmermans, + 2000-2009 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 @@ -17,22 +17,18 @@ along with this program; if not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. - $Id: net_setup.c,v 1.1.2.50 2003/12/20 21:25:17 guus Exp $ + $Id$ */ #include "system.h" -#include -#include -#include -#include -#include - -#include "avl_tree.h" +#include "splay_tree.h" +#include "cipher.h" #include "conf.h" #include "connection.h" +#include "control.h" #include "device.h" -#include "event.h" +#include "digest.h" #include "graph.h" #include "logger.h" #include "net.h" @@ -40,136 +36,77 @@ #include "process.h" #include "protocol.h" #include "route.h" +#include "rsa.h" #include "subnet.h" #include "utils.h" #include "xalloc.h" char *myport; +static struct event device_ev; -bool read_rsa_public_key(connection_t *c) -{ +bool read_rsa_public_key(connection_t *c) { FILE *fp; char *fname; - char *key; + char *n; + bool result; cp(); - if(!c->rsa_key) { - c->rsa_key = RSA_new(); -// RSA_blinding_on(c->rsa_key, NULL); - } - /* First, check for simple PublicKey statement */ - if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &key)) { - BN_hex2bn(&c->rsa_key->n, key); - BN_hex2bn(&c->rsa_key->e, "FFFF"); - free(key); - return true; + if(get_config_string(lookup_config(c->config_tree, "PublicKey"), &n)) { + result = rsa_set_hex_public_key(&c->rsa, n, "FFFF"); + free(n); + return result; } /* Else, check for PublicKeyFile statement and read it */ - if(get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) { - fp = fopen(fname, "r"); - - if(!fp) { - logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"), - fname, strerror(errno)); - free(fname); - return false; - } - - free(fname); - c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); - fclose(fp); - - if(c->rsa_key) - return true; /* Woohoo. */ - - /* If it fails, try PEM_read_RSA_PUBKEY. */ - fp = fopen(fname, "r"); - - if(!fp) { - logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"), - fname, strerror(errno)); - free(fname); - return false; - } + if(!get_config_string(lookup_config(c->config_tree, "PublicKeyFile"), &fname)) + asprintf(&fname, "%s/hosts/%s", confbase, c->name); - free(fname); - c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL); - fclose(fp); - - if(c->rsa_key) { -// RSA_blinding_on(c->rsa_key, NULL); - return true; - } + fp = fopen(fname, "r"); - logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"), + if(!fp) { + logger(LOG_ERR, _("Error reading RSA public key file `%s': %s"), fname, strerror(errno)); + free(fname); return false; } - /* Else, check if a harnessed public key is in the config file */ - - asprintf(&fname, "%s/hosts/%s", confbase, c->name); - fp = fopen(fname, "r"); - - if(fp) { - c->rsa_key = PEM_read_RSAPublicKey(fp, &c->rsa_key, NULL, NULL); - fclose(fp); - } - - free(fname); - - if(c->rsa_key) - return true; - - /* Try again with PEM_read_RSA_PUBKEY. */ - - asprintf(&fname, "%s/hosts/%s", confbase, c->name); - fp = fopen(fname, "r"); - - if(fp) { - c->rsa_key = PEM_read_RSA_PUBKEY(fp, &c->rsa_key, NULL, NULL); -// RSA_blinding_on(c->rsa_key, NULL); - fclose(fp); - } + result = rsa_read_pem_public_key(&c->rsa, fp); + fclose(fp); + if(!result) + logger(LOG_ERR, _("Reading RSA public key file `%s' failed: %s"), fname, strerror(errno)); free(fname); - - if(c->rsa_key) - return true; - - logger(LOG_ERR, _("No public key for %s specified!"), c->name); - - return false; + return result; } -bool read_rsa_private_key(void) -{ +bool read_rsa_private_key() { FILE *fp; - char *fname, *key, *pubkey; - struct stat s; + char *fname; + char *n, *d; + bool result; cp(); - if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) { - if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &pubkey)) { + /* First, check for simple PrivateKey statement */ + + if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) { + if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &n)) { logger(LOG_ERR, _("PrivateKey used but no PublicKey found!")); + free(d); return false; } - myself->connection->rsa_key = RSA_new(); -// RSA_blinding_on(myself->connection->rsa_key, NULL); - BN_hex2bn(&myself->connection->rsa_key->d, key); - BN_hex2bn(&myself->connection->rsa_key->n, pubkey); - BN_hex2bn(&myself->connection->rsa_key->e, "FFFF"); - free(key); - free(pubkey); + result = rsa_set_hex_private_key(&myself->connection->rsa, n, "FFFF", d); + free(n); + free(d); return true; } + /* Else, check for PrivateKeyFile statement and read it */ + if(!get_config_string(lookup_config(config_tree, "PrivateKeyFile"), &fname)) asprintf(&fname, "%s/rsa_key.priv", confbase); @@ -183,9 +120,10 @@ bool read_rsa_private_key(void) } #if !defined(HAVE_MINGW) && !defined(HAVE_CYGWIN) + struct stat s; + if(fstat(fileno(fp), &s)) { - logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"), - fname, strerror(errno)); + logger(LOG_ERR, _("Could not stat RSA private key file `%s': %s'"), fname, strerror(errno)); free(fname); return false; } @@ -194,25 +132,37 @@ bool read_rsa_private_key(void) logger(LOG_WARNING, _("Warning: insecure file permissions for RSA private key file `%s'!"), fname); #endif - myself->connection->rsa_key = PEM_read_RSAPrivateKey(fp, NULL, NULL, NULL); + result = rsa_read_pem_private_key(&myself->connection->rsa, fp); fclose(fp); - if(!myself->connection->rsa_key) { - logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"), - fname, strerror(errno)); - free(fname); - return false; + if(!result) + logger(LOG_ERR, _("Reading RSA private key file `%s' failed: %s"), fname, strerror(errno)); + free(fname); + return result; +} + +static struct event keyexpire_event; + +static void keyexpire_handler(int fd, short events, void *data) { + regenerate_key(); +} + +void regenerate_key() { + if(timeout_initialized(&keyexpire_event)) { + ifdebug(STATUS) logger(LOG_INFO, _("Expiring symmetric keys")); + event_del(&keyexpire_event); + send_key_changed(broadcast, myself); + } else { + timeout_set(&keyexpire_event, keyexpire_handler, NULL); } - free(fname); - return true; + event_add(&keyexpire_event, &(struct timeval){keylifetime, 0}); } /* Configure node_t myself and set up the local sockets (listen only) */ -bool setup_myself(void) -{ +bool setup_myself(void) { config_t *cfg; subnet_t *subnet; char *name, *hostname, *mode, *afname, *cipher, *digest; @@ -286,9 +236,6 @@ bool setup_myself(void) if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice) myself->options |= OPTION_TCPONLY; - if(get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) && choice) - myself->options |= OPTION_PMTU_DISCOVERY; - if(myself->options & OPTION_TCPONLY) myself->options |= OPTION_INDIRECT; @@ -309,11 +256,15 @@ bool setup_myself(void) } else routing_mode = RMODE_ROUTER; + if(routing_mode == RMODE_ROUTER) + if(!get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice) || choice) + myself->options |= OPTION_PMTU_DISCOVERY; + get_config_bool(lookup_config(config_tree, "PriorityInheritance"), &priorityinheritance); #if !defined(SOL_IP) || !defined(IP_TOS) if(priorityinheritance) - logger(LOG_WARNING, _("PriorityInheritance not supported on this platform")); + logger(LOG_WARNING, _("%s not supported on this platform"), "PriorityInheritance"); #endif if(!get_config_int(lookup_config(config_tree, "MACExpire"), &macexpire)) @@ -345,91 +296,50 @@ bool setup_myself(void) /* Generate packet encryption key */ - if(get_config_string - (lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) { - if(!strcasecmp(cipher, "none")) { - myself->cipher = NULL; - } else { - myself->cipher = EVP_get_cipherbyname(cipher); - - if(!myself->cipher) { - logger(LOG_ERR, _("Unrecognized cipher type!")); - return false; - } - } - } else - myself->cipher = EVP_bf_cbc(); - - if(myself->cipher) - myself->keylength = myself->cipher->key_len + myself->cipher->iv_len; - else - myself->keylength = 1; + if(!get_config_string(lookup_config(myself->connection->config_tree, "Cipher"), &cipher)) + cipher = xstrdup("blowfish"); - myself->connection->outcipher = EVP_bf_ofb(); - - myself->key = xmalloc(myself->keylength); - RAND_pseudo_bytes(myself->key, myself->keylength); + if(!cipher_open_by_name(&myself->incipher, cipher)) { + logger(LOG_ERR, _("Unrecognized cipher type!")); + return false; + } if(!get_config_int(lookup_config(config_tree, "KeyExpire"), &keylifetime)) keylifetime = 3600; - keyexpires = now + keylifetime; - - if(myself->cipher) { - EVP_CIPHER_CTX_init(&packet_ctx); - if(!EVP_DecryptInit_ex(&packet_ctx, myself->cipher, NULL, myself->key, myself->key + myself->cipher->key_len)) { - logger(LOG_ERR, _("Error during initialisation of cipher for %s (%s): %s"), - myself->name, myself->hostname, ERR_error_string(ERR_get_error(), NULL)); - return false; - } + regenerate_key(); + /* Check if we want to use message authentication codes... */ + + if(!get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest)) + digest = xstrdup("sha1"); + + if(!digest_open_by_name(&myself->indigest, digest)) { + logger(LOG_ERR, _("Unrecognized digest type!")); + return false; } - /* Check if we want to use message authentication codes... */ + if(!get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->inmaclength)) - if(get_config_string - (lookup_config(myself->connection->config_tree, "Digest"), &digest)) { - if(!strcasecmp(digest, "none")) { - myself->digest = NULL; - } else { - myself->digest = EVP_get_digestbyname(digest); - - if(!myself->digest) { - logger(LOG_ERR, _("Unrecognized digest type!")); - return false; - } - } - } else - myself->digest = EVP_sha1(); - - myself->connection->outdigest = EVP_sha1(); - - if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), - &myself->maclength)) { - if(myself->digest) { - if(myself->maclength > myself->digest->md_size) { - logger(LOG_ERR, _("MAC length exceeds size of digest!")); - return false; - } else if(myself->maclength < 0) { - logger(LOG_ERR, _("Bogus MAC length!")); - return false; - } + if(digest_active(&myself->indigest)) { + if(myself->inmaclength > digest_length(&myself->indigest)) { + logger(LOG_ERR, _("MAC length exceeds size of digest!")); + return false; + } else if(myself->inmaclength < 0) { + logger(LOG_ERR, _("Bogus MAC length!")); + return false; } - } else - myself->maclength = 4; - - myself->connection->outmaclength = 0; + } /* Compression */ - if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), - &myself->compression)) { - if(myself->compression < 0 || myself->compression > 11) { + if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->incompression)) { + if(myself->incompression < 0 || myself->incompression > 11) { logger(LOG_ERR, _("Bogus compression level!")); return false; } } else - myself->compression = 0; + myself->incompression = 0; myself->connection->outcompression = 0; @@ -437,7 +347,6 @@ bool setup_myself(void) myself->nexthop = myself; myself->via = myself; - myself->status.active = true; myself->status.reachable = true; node_add(myself); @@ -448,6 +357,14 @@ bool setup_myself(void) if(!setup_device()) return false; + event_set(&device_ev, device_fd, EV_READ|EV_PERSIST, handle_device_data, NULL); + + if (event_add(&device_ev, NULL) < 0) { + logger(LOG_ERR, _("event_add failed: %s"), strerror(errno)); + close_device(); + return false; + } + /* Run tinc-up script to further initialize the tap interface */ asprintf(&envp[0], "NETNAME=%s", netname ? : ""); asprintf(&envp[1], "DEVICE=%s", device ? : ""); @@ -460,6 +377,10 @@ bool setup_myself(void) for(i = 0; i < 5; i++) free(envp[i]); + /* Run subnet-up scripts for our own subnets */ + + subnet_update(myself, NULL, true); + /* Open sockets */ get_config_string(lookup_config(config_tree, "BindToAddress"), &address); @@ -489,8 +410,28 @@ bool setup_myself(void) listen_socket[listen_sockets].udp = setup_vpn_in_socket((sockaddr_t *) aip->ai_addr); - if(listen_socket[listen_sockets].udp < 0) + if(listen_socket[listen_sockets].udp < 0) { + close(listen_socket[listen_sockets].tcp); continue; + } + + event_set(&listen_socket[listen_sockets].ev_tcp, + listen_socket[listen_sockets].tcp, + EV_READ|EV_PERSIST, + handle_new_meta_connection, NULL); + if(event_add(&listen_socket[listen_sockets].ev_tcp, NULL) < 0) { + logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno)); + abort(); + } + + event_set(&listen_socket[listen_sockets].ev_udp, + listen_socket[listen_sockets].udp, + EV_READ|EV_PERSIST, + handle_incoming_vpn_data, NULL); + if(event_add(&listen_socket[listen_sockets].ev_udp, NULL) < 0) { + logger(LOG_EMERG, _("event_add failed: %s"), strerror(errno)); + abort(); + } ifdebug(CONNECTIONS) { hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr); @@ -498,8 +439,13 @@ bool setup_myself(void) free(hostname); } - listen_socket[listen_sockets].sa.sa = *aip->ai_addr; + memcpy(&listen_socket[listen_sockets].sa, aip->ai_addr, aip->ai_addrlen); listen_sockets++; + + if(listen_sockets >= MAXSOCKETS) { + logger(LOG_WARNING, _("Maximum of %d listening sockets reached"), MAXSOCKETS); + break; + } } freeaddrinfo(ai); @@ -515,42 +461,44 @@ bool setup_myself(void) } /* - setup all initial network connections + initialize network */ -bool setup_network_connections(void) +bool setup_network(void) { cp(); - now = time(NULL); - init_connections(); init_subnets(); init_nodes(); init_edges(); - init_events(); init_requests(); - if(get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) { - if(pingtimeout < 1) { - pingtimeout = 86400; + if(get_config_int(lookup_config(config_tree, "PingInterval"), &pinginterval)) { + if(pinginterval < 1) { + pinginterval = 86400; } } else - pingtimeout = 60; + pinginterval = 60; + + if(!get_config_int(lookup_config(config_tree, "PingTimeout"), &pingtimeout)) + pingtimeout = 5; + if(pingtimeout < 1 || pingtimeout > pinginterval) + pingtimeout = pinginterval; + + if(!get_config_int(lookup_config(config_tree, "MaxOutputBufferSize"), &maxoutbufsize)) + maxoutbufsize = 10 * MTU; if(!setup_myself()) return false; - try_outgoing_connections(); - return true; } /* close all open network connections */ -void close_network_connections(void) -{ - avl_node_t *node, *next; +void close_network_connections(void) { + splay_node_t *node, *next; connection_t *c; char *envp[5]; int i; @@ -560,35 +508,41 @@ void close_network_connections(void) for(node = connection_tree->head; node; node = next) { next = node->next; c = node->data; - - if(c->outgoing) - free(c->outgoing->name), free(c->outgoing), c->outgoing = NULL; + c->outgoing = false; terminate_connection(c, false); } - if(myself && myself->connection) + list_delete_list(outgoing_list); + + if(myself && myself->connection) { + subnet_update(myself, NULL, false); terminate_connection(myself->connection, false); + free_connection(myself->connection); + } for(i = 0; i < listen_sockets; i++) { + event_del(&listen_socket[i].ev_tcp); + event_del(&listen_socket[i].ev_udp); close(listen_socket[i].tcp); close(listen_socket[i].udp); } - exit_requests(); - exit_events(); - exit_edges(); - exit_subnets(); - exit_nodes(); - exit_connections(); - asprintf(&envp[0], "NETNAME=%s", netname ? : ""); asprintf(&envp[1], "DEVICE=%s", device ? : ""); asprintf(&envp[2], "INTERFACE=%s", iface ? : ""); asprintf(&envp[3], "NAME=%s", myself->name); envp[4] = NULL; + exit_requests(); + exit_edges(); + exit_subnets(); + exit_nodes(); + exit_connections(); + execute_script("tinc-down", envp); + if(myport) free(myport); + for(i = 0; i < 4; i++) free(envp[i]);