/*
protocol_auth.c -- handle the meta-protocol, authentication
Copyright (C) 1999-2005 Ivo Timmermans,
- 2000-2007 Guus Sliepen <guus@tinc-vpn.org>
+ 2000-2012 Guus Sliepen <guus@tinc-vpn.org>
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
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
- 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.
-
- $Id$
+ 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.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "system.h"
-#include "splay_tree.h"
#include "conf.h"
#include "connection.h"
+#include "control.h"
+#include "control_common.h"
+#include "cipher.h"
#include "crypto.h"
+#include "digest.h"
#include "edge.h"
#include "graph.h"
#include "logger.h"
+#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "node.h"
+#include "prf.h"
#include "protocol.h"
#include "rsa.h"
+#include "sptps.h"
#include "utils.h"
#include "xalloc.h"
+static bool send_proxyrequest(connection_t *c) {
+ switch(proxytype) {
+ case PROXY_HTTP: {
+ char *host;
+ char *port;
+
+ sockaddr2str(&c->address, &host, &port);
+ send_request(c, "CONNECT %s:%s HTTP/1.1\r\n\r", host, port);
+ free(host);
+ free(port);
+ return true;
+ }
+ case PROXY_SOCKS4: {
+ if(c->address.sa.sa_family != AF_INET) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Cannot connect to an IPv6 host through a SOCKS 4 proxy!");
+ return false;
+ }
+ char s4req[9 + (proxyuser ? strlen(proxyuser) : 0)];
+ s4req[0] = 4;
+ s4req[1] = 1;
+ memcpy(s4req + 2, &c->address.in.sin_port, 2);
+ memcpy(s4req + 4, &c->address.in.sin_addr, 4);
+ if(proxyuser)
+ memcpy(s4req + 8, proxyuser, strlen(proxyuser));
+ s4req[sizeof s4req - 1] = 0;
+ c->tcplen = 8;
+ return send_meta(c, s4req, sizeof s4req);
+ }
+ case PROXY_SOCKS5: {
+ int len = 3 + 6 + (c->address.sa.sa_family == AF_INET ? 4 : 16);
+ c->tcplen = 2;
+ if(proxypass)
+ len += 3 + strlen(proxyuser) + strlen(proxypass);
+ char s5req[len];
+ int i = 0;
+ s5req[i++] = 5;
+ s5req[i++] = 1;
+ if(proxypass) {
+ s5req[i++] = 2;
+ s5req[i++] = 1;
+ s5req[i++] = strlen(proxyuser);
+ memcpy(s5req + i, proxyuser, strlen(proxyuser));
+ i += strlen(proxyuser);
+ s5req[i++] = strlen(proxypass);
+ memcpy(s5req + i, proxypass, strlen(proxypass));
+ i += strlen(proxypass);
+ c->tcplen += 2;
+ } else {
+ s5req[i++] = 0;
+ }
+ s5req[i++] = 5;
+ s5req[i++] = 1;
+ s5req[i++] = 0;
+ if(c->address.sa.sa_family == AF_INET) {
+ s5req[i++] = 1;
+ memcpy(s5req + i, &c->address.in.sin_addr, 4);
+ i += 4;
+ memcpy(s5req + i, &c->address.in.sin_port, 2);
+ i += 2;
+ c->tcplen += 10;
+ } else if(c->address.sa.sa_family == AF_INET6) {
+ s5req[i++] = 3;
+ memcpy(s5req + i, &c->address.in6.sin6_addr, 16);
+ i += 16;
+ memcpy(s5req + i, &c->address.in6.sin6_port, 2);
+ i += 2;
+ c->tcplen += 22;
+ } else {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Address family %hx not supported for SOCKS 5 proxies!", c->address.sa.sa_family);
+ return false;
+ }
+ if(i > len)
+ abort();
+ return send_meta(c, s5req, sizeof s5req);
+ }
+ case PROXY_SOCKS4A:
+ logger(DEBUG_ALWAYS, LOG_ERR, "Proxy type not implemented yet");
+ return false;
+ case PROXY_EXEC:
+ return true;
+ default:
+ logger(DEBUG_ALWAYS, LOG_ERR, "Unknown proxy type");
+ return false;
+ }
+}
+
bool send_id(connection_t *c) {
- cp();
+ gettimeofday(&c->start, NULL);
- return send_request(c, "%d %s %d", ID, myself->connection->name,
- myself->connection->protocol_version);
+ int minor = 0;
+
+ if(experimental) {
+ if(c->config_tree && !read_ecdsa_public_key(c))
+ minor = 1;
+ else
+ minor = myself->connection->protocol_minor;
+ }
+
+ if(proxytype)
+ if(!send_proxyrequest(c))
+ return false;
+
+ return send_request(c, "%d %s %d.%d", ID, myself->connection->name, myself->connection->protocol_major, minor);
}
-bool id_h(connection_t *c, char *request) {
+bool id_h(connection_t *c, const char *request) {
char name[MAX_STRING_SIZE];
- cp();
-
- if(sscanf(request, "%*d " MAX_STRING " %d", name, &c->protocol_version) != 2) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ID", c->name,
+ if(sscanf(request, "%*d " MAX_STRING " %d.%d", name, &c->protocol_major, &c->protocol_minor) < 2) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
c->hostname);
return false;
}
+ /* Check if this is a control connection */
+
+ if(name[0] == '^' && !strcmp(name + 1, controlcookie)) {
+ c->status.control = true;
+ c->allow_request = CONTROL;
+ c->last_ping_time = time(NULL) + 3600;
+
+ free(c->name);
+ c->name = xstrdup("<control>");
+
+ return send_request(c, "%d %d %d", ACK, TINC_CTL_VERSION_CURRENT, getpid());
+ }
+
/* Check if identity is a valid name */
if(!check_id(name)) {
- logger(LOG_ERR, _("Got bad %s from %s (%s): %s"), "ID", c->name,
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
c->hostname, "invalid name");
return false;
}
if(c->outgoing) {
if(strcmp(c->name, name)) {
- logger(LOG_ERR, _("Peer %s is %s instead of %s"), c->hostname, name,
+ logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
c->name);
return false;
}
/* Check if version matches */
- if(c->protocol_version != myself->connection->protocol_version) {
- logger(LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
- c->name, c->hostname, c->protocol_version);
+ if(c->protocol_major != myself->connection->protocol_major) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s (%s) uses incompatible version %d.%d",
+ c->name, c->hostname, c->protocol_major, c->protocol_minor);
return false;
}
return send_ack(c);
}
+ if(!experimental)
+ c->protocol_minor = 0;
+
if(!c->config_tree) {
init_configuration(&c->config_tree);
- if(!read_connection_config(c)) {
- logger(LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname,
- c->name);
+ if(!read_host_config(c->config_tree, c->name)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname, c->name);
return false;
}
- }
- if(!read_rsa_public_key(c)) {
- return false;
+ if(experimental && c->protocol_minor >= 2) {
+ if(!read_ecdsa_public_key(c))
+ return false;
+ }
+ } else {
+ if(c->protocol_minor && !ecdsa_active(&c->ecdsa))
+ c->protocol_minor = 1;
}
c->allow_request = METAKEY;
- return send_metakey(c);
+ if(c->protocol_minor >= 2) {
+ c->allow_request = ACK;
+ char label[25 + strlen(myself->name) + strlen(c->name)];
+
+ if(c->outgoing)
+ snprintf(label, sizeof label, "tinc TCP key expansion %s %s", myself->name, c->name);
+ else
+ snprintf(label, sizeof label, "tinc TCP key expansion %s %s", c->name, myself->name);
+
+ return sptps_start(&c->sptps, c, c->outgoing, false, myself->connection->ecdsa, c->ecdsa, label, sizeof label, send_meta_sptps, receive_meta_sptps);
+ } else {
+ return send_metakey(c);
+ }
}
bool send_metakey(connection_t *c) {
- size_t len = rsa_size(&c->rsa);
- char key[len];
- char enckey[len];
- char hexkey[2 * len + 1];
-
- cp();
+ if(!read_rsa_public_key(c))
+ return false;
if(!cipher_open_blowfish_ofb(&c->outcipher))
return false;
- if(!digest_open_sha1(&c->outdigest))
+ if(!digest_open_sha1(&c->outdigest, -1))
return false;
+ size_t len = rsa_size(&c->rsa);
+ char key[len];
+ char enckey[len];
+ char hexkey[2 * len + 1];
+
/* Create a random key */
randomize(key, len);
cipher_set_key_from_rsa(&c->outcipher, key, len, true);
- ifdebug(SCARY_THINGS) {
+ if(debug_level >= DEBUG_SCARY_THINGS) {
bin2hex(key, hexkey, len);
- hexkey[len * 2] = '\0';
- logger(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), hexkey);
+ logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Generated random meta key (unencrypted): %s", hexkey);
}
/* Encrypt the random data
*/
if(!rsa_public_encrypt(&c->rsa, key, len, enckey)) {
- logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during encryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
/* Convert the encrypted random data to a hexadecimal formatted string */
bin2hex(enckey, hexkey, len);
- hexkey[len * 2] = '\0';
/* Send the meta key */
return result;
}
-bool metakey_h(connection_t *c, char *request) {
+bool metakey_h(connection_t *c, const char *request) {
char hexkey[MAX_STRING_SIZE];
int cipher, digest, maclength, compression;
size_t len = rsa_size(&myself->connection->rsa);
char enckey[len];
char key[len];
- cp();
-
if(sscanf(request, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, hexkey) != 5) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name, c->hostname);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name, c->hostname);
return false;
}
+ /* Convert the challenge from hexadecimal back to binary */
+
+ int inlen = hex2bin(hexkey, enckey, sizeof enckey);
+
/* Check if the length of the meta key is all right */
- if(strlen(hexkey) != len * 2) {
- logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength");
+ if(inlen != len) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
return false;
}
- /* Convert the challenge from hexadecimal back to binary */
-
- hex2bin(hexkey, enckey, len);
-
/* Decrypt the meta key */
if(!rsa_private_decrypt(&myself->connection->rsa, enckey, len, key)) {
- logger(LOG_ERR, _("Error during encryption of meta key for %s (%s)"), c->name, c->hostname);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during decryption of meta key for %s (%s)", c->name, c->hostname);
return false;
}
- ifdebug(SCARY_THINGS) {
+ if(debug_level >= DEBUG_SCARY_THINGS) {
bin2hex(key, hexkey, len);
- hexkey[len * 2] = '\0';
- logger(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), hexkey);
+ logger(DEBUG_SCARY_THINGS, LOG_DEBUG, "Received random meta key (unencrypted): %s", hexkey);
}
/* Check and lookup cipher and digest algorithms */
if(!cipher_open_by_nid(&c->incipher, cipher) || !cipher_set_key_from_rsa(&c->incipher, key, len, false)) {
- logger(LOG_ERR, _("Error during initialisation of cipher from %s (%s)"), c->name, c->hostname);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of cipher from %s (%s)", c->name, c->hostname);
return false;
}
- if(!digest_open_by_nid(&c->indigest, digest)) {
- logger(LOG_ERR, _("Error during initialisation of digest from %s (%s)"), c->name, c->hostname);
+ if(!digest_open_by_nid(&c->indigest, digest, -1)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Error during initialisation of digest from %s (%s)", c->name, c->hostname);
return false;
}
size_t len = rsa_size(&c->rsa);
char buffer[len * 2 + 1];
- cp();
-
if(!c->hischallenge)
- c->hischallenge = xmalloc(len);
+ c->hischallenge = xrealloc(c->hischallenge, len);
/* Copy random data to the buffer */
/* Convert to hex */
bin2hex(c->hischallenge, buffer, len);
- buffer[len * 2] = '\0';
/* Send the challenge */
return send_request(c, "%d %s", CHALLENGE, buffer);
}
-bool challenge_h(connection_t *c, char *request) {
+bool challenge_h(connection_t *c, const char *request) {
char buffer[MAX_STRING_SIZE];
size_t len = rsa_size(&myself->connection->rsa);
- size_t digestlen = digest_length(&c->outdigest);
+ size_t digestlen = digest_length(&c->indigest);
char digest[digestlen];
- cp();
-
if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name, c->hostname);
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name, c->hostname);
return false;
}
+ /* Convert the challenge from hexadecimal back to binary */
+
+ int inlen = hex2bin(buffer, buffer, sizeof buffer);
+
/* Check if the length of the challenge is all right */
- if(strlen(buffer) != len * 2) {
- logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong challenge length");
+ if(inlen != len) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge length");
return false;
}
- /* Convert the challenge from hexadecimal back to binary */
-
- hex2bin(buffer, buffer, len);
-
c->allow_request = CHAL_REPLY;
- cp();
-
/* Calculate the hash from the challenge we received */
digest_create(&c->indigest, buffer, len, digest);
/* Convert the hash to a hexadecimal formatted string */
bin2hex(digest, buffer, digestlen);
- buffer[digestlen * 2] = '\0';
/* Send the reply */
return send_request(c, "%d %s", CHAL_REPLY, buffer);
}
-bool chal_reply_h(connection_t *c, char *request) {
+bool chal_reply_h(connection_t *c, const char *request) {
char hishash[MAX_STRING_SIZE];
- cp();
-
if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name,
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
c->hostname);
return false;
}
+ /* Convert the hash to binary format */
+
+ int inlen = hex2bin(hishash, hishash, sizeof hishash);
+
/* Check if the length of the hash is all right */
- if(strlen(hishash) != digest_length(&c->outdigest) * 2) {
- logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply length"));
+ if(inlen != digest_length(&c->outdigest)) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply length");
return false;
}
- /* Convert the hash to binary format */
-
- hex2bin(hishash, hishash, digest_length(&c->outdigest));
/* Verify the hash */
if(!digest_verify(&c->outdigest, c->hischallenge, rsa_size(&c->rsa), hishash)) {
- logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, _("wrong challenge reply"));
+ logger(DEBUG_ALWAYS, LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong challenge reply");
return false;
}
*/
free(c->hischallenge);
+ c->hischallenge = NULL;
c->allow_request = ACK;
return send_ack(c);
}
+static bool send_upgrade(connection_t *c) {
+ /* Special case when protocol_minor is 1: the other end is ECDSA capable,
+ * but doesn't know our key yet. So send it now. */
+
+ char *pubkey = ecdsa_get_base64_public_key(&myself->connection->ecdsa);
+
+ if(!pubkey)
+ return false;
+
+ bool result = send_request(c, "%d %s", ACK, pubkey);
+ free(pubkey);
+ return result;
+}
+
bool send_ack(connection_t *c) {
+ if(c->protocol_minor == 1)
+ return send_upgrade(c);
+
/* ACK message contains rest of the information the other end needs
to create node_t and edge_t structures. */
struct timeval now;
bool choice;
- cp();
-
/* Estimate weight */
gettimeofday(&now, NULL);
if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY)
c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
- if((get_config_bool(lookup_config(c->config_tree, "PMTUDiscovery"), &choice) && choice) || myself->options & OPTION_PMTU_DISCOVERY)
+ if(myself->options & OPTION_PMTU_DISCOVERY)
c->options |= OPTION_PMTU_DISCOVERY;
+ choice = myself->options & OPTION_CLAMP_MSS;
+ get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice);
+ if(choice)
+ c->options |= OPTION_CLAMP_MSS;
+
get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight);
- return send_request(c, "%d %s %d %lx", ACK, myport, c->estimated_weight, c->options);
+ return send_request(c, "%d %s %d %x", ACK, myport, c->estimated_weight, (c->options & 0xffffff) | (experimental ? (PROT_MINOR << 24) : 0));
}
static void send_everything(connection_t *c) {
}
}
-bool ack_h(connection_t *c, char *request) {
+static bool upgrade_h(connection_t *c, const char *request) {
+ char pubkey[MAX_STRING_SIZE];
+
+ if(sscanf(request, "%*d " MAX_STRING, pubkey) != 1) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name, c->hostname);
+ return false;
+ }
+
+ if(ecdsa_active(&c->ecdsa) || read_ecdsa_public_key(c)) {
+ logger(DEBUG_ALWAYS, LOG_INFO, "Already have ECDSA public key from %s (%s), not upgrading.", c->name, c->hostname);
+ return false;
+ }
+
+ logger(DEBUG_ALWAYS, LOG_INFO, "Got ECDSA public key from %s (%s), upgrading!", c->name, c->hostname);
+ append_config_file(c->name, "ECDSAPublicKey", pubkey);
+ c->allow_request = TERMREQ;
+ return send_termreq(c);
+}
+
+bool ack_h(connection_t *c, const char *request) {
+ if(c->protocol_minor == 1)
+ return upgrade_h(c, request);
+
char hisport[MAX_STRING_SIZE];
- char *hisaddress, *dummy;
+ char *hisaddress;
int weight, mtu;
- long int options;
+ uint32_t options;
node_t *n;
+ bool choice;
- cp();
-
- if(sscanf(request, "%*d " MAX_STRING " %d %lx", hisport, &weight, &options) != 3) {
- logger(LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name,
+ if(sscanf(request, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
+ logger(DEBUG_ALWAYS, LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
c->hostname);
return false;
}
} else {
if(n->connection) {
/* Oh dear, we already have a connection to this node. */
- ifdebug(CONNECTIONS) logger(LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"), n->connection->name, n->connection->hostname);
+ logger(DEBUG_CONNECTIONS, LOG_DEBUG, "Established a second connection with %s (%s), closing old connection", n->connection->name, n->connection->hostname);
if(n->connection->outgoing) {
if(c->outgoing)
- logger(LOG_WARNING, _("Two outgoing connections to the same node!"));
+ logger(DEBUG_ALWAYS, LOG_WARNING, "Two outgoing connections to the same node!");
else
c->outgoing = n->connection->outgoing;
n->connection = c;
c->node = n;
+ if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
+ c->options &= ~OPTION_PMTU_DISCOVERY;
+ options &= ~OPTION_PMTU_DISCOVERY;
+ }
c->options |= options;
if(get_config_int(lookup_config(c->config_tree, "PMTU"), &mtu) && mtu < n->mtu)
n->mtu = mtu;
- if(get_config_int(lookup_config(myself->connection->config_tree, "PMTU"), &mtu) && mtu < n->mtu)
+ if(get_config_int(lookup_config(config_tree, "PMTU"), &mtu) && mtu < n->mtu)
n->mtu = mtu;
+ if(get_config_bool(lookup_config(c->config_tree, "ClampMSS"), &choice)) {
+ if(choice)
+ c->options |= OPTION_CLAMP_MSS;
+ else
+ c->options &= ~OPTION_CLAMP_MSS;
+ }
+
/* Activate this connection */
c->allow_request = ALL;
c->status.active = true;
- ifdebug(CONNECTIONS) logger(LOG_NOTICE, _("Connection with %s (%s) activated"), c->name,
+ logger(DEBUG_CONNECTIONS, LOG_NOTICE, "Connection with %s (%s) activated", c->name,
c->hostname);
/* Send him everything we know */
/* Create an edge_t for this connection */
c->edge = new_edge();
- cp();
c->edge->from = myself;
c->edge->to = n;
- sockaddr2str(&c->address, &hisaddress, &dummy);
+ sockaddr2str(&c->address, &hisaddress, NULL);
c->edge->address = str2sockaddr(hisaddress, hisport);
free(hisaddress);
- free(dummy);
c->edge->weight = (weight + c->estimated_weight) / 2;
c->edge->connection = c;
c->edge->options = c->options;
if(tunnelserver)
send_add_edge(c, c->edge);
else
- send_add_edge(broadcast, c->edge);
+ send_add_edge(everyone, c->edge);
/* Run MST and SSSP algorithms */
projects / tinc / blobdiff