X-Git-Url: https://www.tinc-vpn.org/git/browse?p=tinc;a=blobdiff_plain;f=src%2Fnet_setup.c;h=b31bed737e0653ae0a0c8fb1a7bf130a6c6364a0;hp=cb70926ad0c3dbaa13bac715514098a536f533a8;hb=3f59a26d8098b8b0902b8746715508360b347f47;hpb=32f5524c4b52a2d3a96bc48ee2437f8b9b4dbe10 diff --git a/src/net_setup.c b/src/net_setup.c index cb70926a..b31bed73 100644 --- a/src/net_setup.c +++ b/src/net_setup.c @@ -3,6 +3,7 @@ Copyright (C) 1998-2005 Ivo Timmermans, 2000-2010 Guus Sliepen 2006 Scott Lamb + 2010 Brandon Black 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 @@ -21,17 +22,13 @@ #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" @@ -39,130 +36,73 @@ #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) { FILE *fp; char *fname; - char *key; - - if(!c->rsa_key) { - c->rsa_key = RSA_new(); -// RSA_blinding_on(c->rsa_key, NULL); - } + char *n; + bool result; /* 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)) + xasprintf(&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 */ - - xasprintf(&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. */ - - xasprintf(&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; + + /* First, check for simple PrivateKey statement */ - if(get_config_string(lookup_config(config_tree, "PrivateKey"), &key)) { - if(!get_config_string(lookup_config(myself->connection->config_tree, "PublicKey"), &pubkey)) { + if(get_config_string(lookup_config(config_tree, "PrivateKey"), &d)) { + if(!get_config_string(lookup_config(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)) xasprintf(&fname, "%s/rsa_key.priv", confbase); @@ -176,9 +116,10 @@ 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; } @@ -187,18 +128,31 @@ 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}); } /* @@ -209,7 +163,7 @@ void load_all_subnets(void) { struct dirent *ent; char *dname; char *fname; - avl_tree_t *config_tree; + splay_tree_t *config_tree; config_t *cfg; subnet_t *s, *s2; node_t *n; @@ -270,15 +224,16 @@ bool setup_myself(void) { config_t *cfg; subnet_t *subnet; char *name, *hostname, *mode, *afname, *cipher, *digest; + char *fname = NULL; char *address = NULL; char *envp[5]; struct addrinfo *ai, *aip, hint = {0}; bool choice; int i, err; + int replaywin_int; myself = new_node(); myself->connection = new_connection(); - init_configuration(&myself->connection->config_tree); myself->hostname = xstrdup("MYSELF"); myself->connection->hostname = xstrdup("MYSELF"); @@ -299,17 +254,15 @@ bool setup_myself(void) { myself->name = name; myself->connection->name = xstrdup(name); - - if(!read_connection_config(myself->connection)) { - logger(LOG_ERR, "Cannot open host configuration file for myself!"); - return false; - } + xasprintf(&fname, "%s/hosts/%s", confbase, name); + read_config_options(config_tree, name); + read_config_file(config_tree, fname); + free(fname); if(!read_rsa_private_key()) return false; - if(!get_config_string(lookup_config(config_tree, "Port"), &myport) - && !get_config_string(lookup_config(myself->connection->config_tree, "Port"), &myport)) + if(!get_config_string(lookup_config(config_tree, "Port"), &myport)) myport = xstrdup("655"); if(!atoi(myport)) { @@ -324,7 +277,7 @@ bool setup_myself(void) { /* Read in all the subnets specified in the host configuration file */ - cfg = lookup_config(myself->connection->config_tree, "Subnet"); + cfg = lookup_config(config_tree, "Subnet"); while(cfg) { if(!get_config_subnet(cfg, &subnet)) @@ -332,7 +285,7 @@ bool setup_myself(void) { subnet_add(myself, subnet); - cfg = lookup_config_next(myself->connection->config_tree, cfg); + cfg = lookup_config_next(config_tree, cfg); } /* Check some options */ @@ -343,12 +296,6 @@ bool setup_myself(void) { if(get_config_bool(lookup_config(config_tree, "TCPOnly"), &choice) && choice) myself->options |= OPTION_TCPONLY; - if(get_config_bool(lookup_config(myself->connection->config_tree, "IndirectData"), &choice) && choice) - myself->options |= OPTION_INDIRECT; - - if(get_config_bool(lookup_config(myself->connection->config_tree, "TCPOnly"), &choice) && choice) - myself->options |= OPTION_TCPONLY; - if(myself->options & OPTION_TCPONLY) myself->options |= OPTION_INDIRECT; @@ -386,14 +333,12 @@ bool setup_myself(void) { } choice = true; - get_config_bool(lookup_config(myself->connection->config_tree, "PMTUDiscovery"), &choice); get_config_bool(lookup_config(config_tree, "PMTUDiscovery"), &choice); if(choice) myself->options |= OPTION_PMTU_DISCOVERY; choice = true; get_config_bool(lookup_config(config_tree, "ClampMSS"), &choice); - get_config_bool(lookup_config(myself->connection->config_tree, "ClampMSS"), &choice); if(choice) myself->options |= OPTION_CLAMP_MSS; @@ -415,6 +360,28 @@ bool setup_myself(void) { } else maxtimeout = 900; + if(get_config_int(lookup_config(config_tree, "UDPRcvBuf"), &udp_rcvbuf)) { + if(udp_rcvbuf <= 0) { + logger(LOG_ERR, "UDPRcvBuf cannot be negative!"); + return false; + } + } + + if(get_config_int(lookup_config(config_tree, "UDPSndBuf"), &udp_sndbuf)) { + if(udp_sndbuf <= 0) { + logger(LOG_ERR, "UDPSndBuf cannot be negative!"); + return false; + } + } + + if(get_config_int(lookup_config(config_tree, "ReplayWindow"), &replaywin_int)) { + if(replaywin_int < 0) { + logger(LOG_ERR, "ReplayWindow cannot be negative!"); + return false; + } + replaywin = (unsigned)replaywin_int; + } + if(get_config_string(lookup_config(config_tree, "AddressFamily"), &afname)) { if(!strcasecmp(afname, "IPv4")) addressfamily = AF_INET; @@ -433,69 +400,40 @@ 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->incipher = NULL; - } else { - myself->incipher = EVP_get_cipherbyname(cipher); - - if(!myself->incipher) { - logger(LOG_ERR, "Unrecognized cipher type!"); - return false; - } - } - } else - myself->incipher = EVP_bf_cbc(); - - if(myself->incipher) - myself->inkeylength = myself->incipher->key_len + myself->incipher->iv_len; - else - myself->inkeylength = 1; + if(!get_config_string(lookup_config(config_tree, "Cipher"), &cipher)) + cipher = xstrdup("blowfish"); - myself->connection->outcipher = EVP_bf_ofb(); + 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; - + regenerate_key(); + /* Check if we want to use message authentication codes... */ - if(get_config_string(lookup_config(myself->connection->config_tree, "Digest"), &digest)) { - if(!strcasecmp(digest, "none")) { - myself->indigest = NULL; - } else { - myself->indigest = EVP_get_digestbyname(digest); + if(!get_config_string(lookup_config(config_tree, "Digest"), &digest)) + digest = xstrdup("sha1"); - if(!myself->indigest) { - logger(LOG_ERR, "Unrecognized digest type!"); - return false; - } - } - } else - myself->indigest = EVP_sha1(); - - myself->connection->outdigest = EVP_sha1(); - - if(get_config_int(lookup_config(myself->connection->config_tree, "MACLength"), &myself->inmaclength)) { - if(myself->indigest) { - if(myself->inmaclength > myself->indigest->md_size) { - 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->inmaclength = 4; + int maclength = 4; + get_config_int(lookup_config(config_tree, "MACLength"), &maclength); + + if(maclength < 0) { + logger(LOG_ERR, "Bogus MAC length!"); + return false; + } - myself->connection->outmaclength = 0; + if(!digest_open_by_name(&myself->indigest, digest, maclength)) { + logger(LOG_ERR, "Unrecognized digest type!"); + return false; + } /* Compression */ - if(get_config_int(lookup_config(myself->connection->config_tree, "Compression"), &myself->incompression)) { + if(get_config_int(lookup_config(config_tree, "Compression"), &myself->incompression)) { if(myself->incompression < 0 || myself->incompression > 11) { logger(LOG_ERR, "Bogus compression level!"); return false; @@ -522,6 +460,16 @@ bool setup_myself(void) { if(!setup_device()) return false; + if(device_fd >= 0) { + 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 */ xasprintf(&envp[0], "NETNAME=%s", netname ? : ""); xasprintf(&envp[1], "DEVICE=%s", device ? : ""); @@ -531,7 +479,7 @@ bool setup_myself(void) { execute_script("tinc-up", envp); - for(i = 0; i < 5; i++) + for(i = 0; i < 4; i++) free(envp[i]); /* Run subnet-up scripts for our own subnets */ @@ -567,8 +515,28 @@ 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_ERR, "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_ERR, "event_add failed: %s", strerror(errno)); + abort(); + } ifdebug(CONNECTIONS) { hostname = sockaddr2hostname((sockaddr_t *) aip->ai_addr); @@ -578,6 +546,11 @@ bool setup_myself(void) { 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); @@ -596,9 +569,6 @@ bool setup_myself(void) { initialize network */ bool setup_network(void) { - now = time(NULL); - - init_events(); init_connections(); init_subnets(); init_nodes(); @@ -630,7 +600,7 @@ bool setup_network(void) { close all open network connections */ void close_network_connections(void) { - avl_node_t *node, *next; + splay_node_t *node, *next; connection_t *c; char *envp[5]; int i; @@ -638,17 +608,10 @@ void close_network_connections(void) { for(node = connection_tree->head; node; node = next) { next = node->next; c = node->data; - c->outgoing = NULL; + c->outgoing = false; terminate_connection(c, false); } - for(list_node_t *node = outgoing_list->head; node; node = node->next) { - outgoing_t *outgoing = node->data; - - if(outgoing->event) - event_del(outgoing->event); - } - list_delete_list(outgoing_list); if(myself && myself->connection) { @@ -658,6 +621,8 @@ void close_network_connections(void) { } 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); } @@ -673,7 +638,6 @@ void close_network_connections(void) { exit_subnets(); exit_nodes(); exit_connections(); - exit_events(); execute_script("tinc-down", envp);