/*
protocol_auth.c -- handle the meta-protocol, authentication
- Copyright (C) 1999-2002 Ivo Timmermans <ivo@o2w.nl>,
- 2000-2002 Guus Sliepen <guus@sliepen.eu.org>
+ Copyright (C) 1999-2005 Ivo Timmermans,
+ 2000-2009 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: protocol_auth.c,v 1.1.4.22 2003/07/06 23:16:29 guus Exp $
+ 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 "config.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
+#include "system.h"
#include <openssl/sha.h>
#include <openssl/rand.h>
+#include <openssl/err.h>
#include <openssl/evp.h>
+#include "avl_tree.h"
#include "conf.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 "logger.h"
+#include "net.h"
+#include "netutl.h"
+#include "node.h"
+#include "protocol.h"
+#include "utils.h"
+#include "xalloc.h"
-#include "system.h"
-
-int send_id(connection_t *c)
-{
- cp();
-
+bool send_id(connection_t *c) {
return send_request(c, "%d %s %d", ID, myself->connection->name,
myself->connection->protocol_version);
}
-int id_h(connection_t *c)
-{
+bool 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) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Got bad %s from %s (%s)"), "ID", c->name,
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
c->hostname);
- return -1;
+ return false;
}
/* Check if identity is a valid name */
- if(check_id(name)) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Got bad %s from %s (%s): %s"), "ID", c->name,
+ if(!check_id(name)) {
+ logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
c->hostname, "invalid name");
- return -1;
+ return false;
}
- /* If we set c->name in advance, make sure we are connected to the right host */
+ /* If this is an outgoing connection, make sure we are connected to the right host */
- if(c->name) {
+ if(c->outgoing) {
if(strcmp(c->name, name)) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Peer %s is %s instead of %s"), c->hostname, name,
+ logger(LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
c->name);
- return -1;
+ return false;
}
- } else
+ } else {
+ if(c->name)
+ free(c->name);
c->name = xstrdup(name);
+ }
/* Check if version matches */
if(c->protocol_version != myself->connection->protocol_version) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Peer %s (%s) uses incompatible version %d"),
+ logger(LOG_ERR, "Peer %s (%s) uses incompatible version %d",
c->name, c->hostname, c->protocol_version);
- return -1;
+ return false;
}
if(bypass_security) {
if(!c->config_tree) {
init_configuration(&c->config_tree);
- bla = read_connection_config(c);
-
- if(bla) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Peer %s had unknown identity (%s)"), c->hostname,
+ if(!read_connection_config(c)) {
+ logger(LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname,
c->name);
- return -1;
+ return false;
}
}
- if(read_rsa_public_key(c)) {
- return -1;
+ if(!read_rsa_public_key(c)) {
+ return false;
}
- /* Check some options */
-
- if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &bla) && bla) || myself->options & OPTION_INDIRECT)
- c->options |= OPTION_INDIRECT;
-
- if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &bla) && bla) || myself->options & OPTION_TCPONLY)
- c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
-
c->allow_request = METAKEY;
return send_metakey(c);
}
-int send_metakey(connection_t *c)
-{
- char buffer[MAX_STRING_SIZE];
- int len, x;
-
- cp();
+bool send_metakey(connection_t *c) {
+ char *buffer;
+ int len;
+ bool x;
len = RSA_size(c->rsa_key);
/* Allocate buffers for the meta key */
- if(!c->outkey)
- c->outkey = xmalloc(len);
+ buffer = alloca(2 * len + 1);
+
+ c->outkey = xrealloc(c->outkey, len);
if(!c->outctx)
c->outctx = xmalloc_and_zero(sizeof(*c->outctx));
- cp();
+
/* Copy random data to the buffer */
- RAND_bytes(c->outkey, len);
+ RAND_pseudo_bytes((unsigned char *)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:
c->outkey[0] &= 0x7F;
- if(debug_level >= DEBUG_SCARY_THINGS) {
+ ifdebug(SCARY_THINGS) {
bin2hex(c->outkey, buffer, len);
buffer[len * 2] = '\0';
- logger(DEBUG_ALWAYS, LOG_DEBUG, _("Generated random meta key (unencrypted): %s"),
+ logger(LOG_DEBUG, "Generated random meta key (unencrypted): %s",
buffer);
}
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) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Error during encryption of meta key for %s (%s)"),
+ if(RSA_public_encrypt(len, (unsigned char *)c->outkey, (unsigned char *)buffer, c->rsa_key, RSA_NO_PADDING) != len) {
+ logger(LOG_ERR, "Error during encryption of meta key for %s (%s)",
c->name, c->hostname);
- return -1;
+ return false;
}
/* Convert the encrypted random data to a hexadecimal formatted string */
/* Further outgoing requests are encrypted with the key we just generated */
if(c->outcipher) {
- EVP_EncryptInit(c->outctx, c->outcipher,
- c->outkey + len - c->outcipher->key_len,
- c->outkey + len - c->outcipher->key_len -
- c->outcipher->iv_len);
+ if(!EVP_EncryptInit(c->outctx, c->outcipher,
+ (unsigned char *)c->outkey + len - c->outcipher->key_len,
+ (unsigned char *)c->outkey + len - c->outcipher->key_len -
+ c->outcipher->iv_len)) {
+ logger(LOG_ERR, "Error during initialisation of cipher for %s (%s): %s",
+ c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ return false;
+ }
- c->status.encryptout = 1;
+ c->status.encryptout = true;
}
return x;
}
-int metakey_h(connection_t *c)
-{
+bool metakey_h(connection_t *c) {
char buffer[MAX_STRING_SIZE];
int cipher, digest, maclength, compression;
int len;
- cp();
-
if(sscanf(c->buffer, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, buffer) != 5) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name,
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name,
c->hostname);
- return -1;
+ return false;
}
len = RSA_size(myself->connection->rsa_key);
/* Check if the length of the meta key is all right */
if(strlen(buffer) != len * 2) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength");
- return -1;
+ logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
+ return false;
}
/* Allocate buffers for the meta key */
- if(!c->inkey)
- c->inkey = xmalloc(len);
+ c->inkey = xrealloc(c->inkey, len);
if(!c->inctx)
c->inctx = xmalloc_and_zero(sizeof(*c->inctx));
/* Decrypt the meta key */
- if(RSA_private_decrypt(len, buffer, c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) { /* See challenge() */
- logger(DEBUG_ALWAYS, LOG_ERR, _("Error during encryption of meta key for %s (%s)"),
+ if(RSA_private_decrypt(len, (unsigned char *)buffer, (unsigned char *)c->inkey, myself->connection->rsa_key, RSA_NO_PADDING) != len) { /* See challenge() */
+ logger(LOG_ERR, "Error during decryption of meta key for %s (%s)",
c->name, c->hostname);
- return -1;
+ return false;
}
- if(debug_level >= DEBUG_SCARY_THINGS) {
+ ifdebug(SCARY_THINGS) {
bin2hex(c->inkey, buffer, len);
buffer[len * 2] = '\0';
- logger(DEBUG_ALWAYS, LOG_DEBUG, _("Received random meta key (unencrypted): %s"), buffer);
+ logger(LOG_DEBUG, "Received random meta key (unencrypted): %s", buffer);
}
/* All incoming requests will now be encrypted. */
c->incipher = EVP_get_cipherbynid(cipher);
if(!c->incipher) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("%s (%s) uses unknown cipher!"), c->name, c->hostname);
- return -1;
+ logger(LOG_ERR, "%s (%s) uses unknown cipher!", c->name, c->hostname);
+ return false;
}
- EVP_DecryptInit(c->inctx, c->incipher,
- c->inkey + len - c->incipher->key_len,
- c->inkey + len - c->incipher->key_len -
- c->incipher->iv_len);
+ if(!EVP_DecryptInit(c->inctx, c->incipher,
+ (unsigned char *)c->inkey + len - c->incipher->key_len,
+ (unsigned char *)c->inkey + len - c->incipher->key_len -
+ c->incipher->iv_len)) {
+ logger(LOG_ERR, "Error during initialisation of cipher from %s (%s): %s",
+ c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ return false;
+ }
- c->status.decryptin = 1;
+ c->status.decryptin = true;
} else {
c->incipher = NULL;
}
c->indigest = EVP_get_digestbynid(digest);
if(!c->indigest) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Node %s (%s) uses unknown digest!"), c->name, c->hostname);
- return -1;
+ logger(LOG_ERR, "Node %s (%s) uses unknown digest!", c->name, c->hostname);
+ return false;
}
if(c->inmaclength > c->indigest->md_size || c->inmaclength < 0) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("%s (%s) uses bogus MAC length!"), c->name, c->hostname);
- return -1;
+ logger(LOG_ERR, "%s (%s) uses bogus MAC length!", c->name, c->hostname);
+ return false;
}
} else {
c->indigest = NULL;
return send_challenge(c);
}
-int send_challenge(connection_t *c)
-{
- char buffer[MAX_STRING_SIZE];
- int len, x;
-
- cp();
+bool send_challenge(connection_t *c) {
+ char *buffer;
+ int len;
/* CHECKME: what is most reasonable value for len? */
/* Allocate buffers for the challenge */
- if(!c->hischallenge)
- c->hischallenge = xmalloc(len);
+ buffer = alloca(2 * len + 1);
+
+ c->hischallenge = xrealloc(c->hischallenge, len);
/* Copy random data to the buffer */
- RAND_bytes(c->hischallenge, len);
+ RAND_pseudo_bytes((unsigned char *)c->hischallenge, len);
/* Convert to hex */
/* Send the challenge */
- x = send_request(c, "%d %s", CHALLENGE, buffer);
-
- return x;
+ return send_request(c, "%d %s", CHALLENGE, buffer);
}
-int challenge_h(connection_t *c)
-{
+bool challenge_h(connection_t *c) {
char buffer[MAX_STRING_SIZE];
int len;
- cp();
-
if(sscanf(c->buffer, "%*d " MAX_STRING, buffer) != 1) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name,
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name,
c->hostname);
- return -1;
+ return false;
}
len = RSA_size(myself->connection->rsa_key);
/* Check if the length of the challenge is all right */
if(strlen(buffer) != len * 2) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
+ logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name,
c->hostname, "wrong challenge length");
- return -1;
+ return false;
}
/* Allocate buffers for the challenge */
- if(!c->mychallenge)
- c->mychallenge = xmalloc(len);
+ c->mychallenge = xrealloc(c->mychallenge, len);
/* Convert the challenge from hexadecimal back to binary */
return send_chal_reply(c);
}
-int send_chal_reply(connection_t *c)
-{
+bool send_chal_reply(connection_t *c) {
char hash[EVP_MAX_MD_SIZE * 2 + 1];
EVP_MD_CTX ctx;
- cp();
-
/* Calculate the hash from the challenge we received */
- EVP_DigestInit(&ctx, c->indigest);
- EVP_DigestUpdate(&ctx, c->mychallenge,
- RSA_size(myself->connection->rsa_key));
- EVP_DigestFinal(&ctx, hash, NULL);
+ if(!EVP_DigestInit(&ctx, c->indigest)
+ || !EVP_DigestUpdate(&ctx, c->mychallenge, RSA_size(myself->connection->rsa_key))
+ || !EVP_DigestFinal(&ctx, (unsigned char *)hash, NULL)) {
+ logger(LOG_ERR, "Error during calculation of response for %s (%s): %s",
+ c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ return false;
+ }
/* Convert the hash to a hexadecimal formatted string */
return send_request(c, "%d %s", CHAL_REPLY, hash);
}
-int chal_reply_h(connection_t *c)
-{
+bool chal_reply_h(connection_t *c) {
char hishash[MAX_STRING_SIZE];
char myhash[EVP_MAX_MD_SIZE];
EVP_MD_CTX ctx;
- cp();
-
if(sscanf(c->buffer, "%*d " MAX_STRING, hishash) != 1) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name,
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
c->hostname);
- return -1;
+ return false;
}
/* Check if the length of the hash is all right */
if(strlen(hishash) != c->outdigest->md_size * 2) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
- c->hostname, _("wrong challenge reply length"));
- return -1;
+ logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name,
+ c->hostname, "wrong challenge reply length");
+ return false;
}
/* Convert the hash to binary format */
/* Calculate the hash from the challenge we sent */
- EVP_DigestInit(&ctx, c->outdigest);
- EVP_DigestUpdate(&ctx, c->hischallenge, RSA_size(c->rsa_key));
- EVP_DigestFinal(&ctx, myhash, NULL);
+ if(!EVP_DigestInit(&ctx, c->outdigest)
+ || !EVP_DigestUpdate(&ctx, c->hischallenge, RSA_size(c->rsa_key))
+ || !EVP_DigestFinal(&ctx, (unsigned char *)myhash, NULL)) {
+ logger(LOG_ERR, "Error during calculation of response from %s (%s): %s",
+ c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
+ return false;
+ }
/* Verify the incoming hash with the calculated hash */
if(memcmp(hishash, myhash, c->outdigest->md_size)) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
- c->hostname, _("wrong challenge reply"));
+ logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name,
+ c->hostname, "wrong challenge reply");
- if(debug_level >= DEBUG_SCARY_THINGS) {
+ ifdebug(SCARY_THINGS) {
bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
hishash[SHA_DIGEST_LENGTH * 2] = '\0';
- logger(DEBUG_ALWAYS, LOG_DEBUG, _("Expected challenge reply: %s"), hishash);
+ logger(LOG_DEBUG, "Expected challenge reply: %s", hishash);
}
- return -1;
+ return false;
}
/* Identity has now been positively verified.
return send_ack(c);
}
-int send_ack(connection_t *c)
-{
+bool send_ack(connection_t *c) {
/* ACK message contains rest of the information the other end needs
to create node_t and edge_t structures. */
- int x;
struct timeval now;
-
- cp();
+ bool choice;
/* Estimate weight */
gettimeofday(&now, NULL);
- c->estimated_weight =
- (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec -
- c->start.tv_usec) / 1000;
- x = send_request(c, "%d %s %d %lx", ACK, myport, c->estimated_weight,
- c->options);
+ c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
- return x;
+ /* Check some options */
+
+ if((get_config_bool(lookup_config(c->config_tree, "IndirectData"), &choice) && choice) || myself->options & OPTION_INDIRECT)
+ c->options |= OPTION_INDIRECT;
+
+ if((get_config_bool(lookup_config(c->config_tree, "TCPOnly"), &choice) && choice) || myself->options & OPTION_TCPONLY)
+ c->options |= OPTION_TCPONLY | OPTION_INDIRECT;
+
+ 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 %x", ACK, myport, c->estimated_weight, c->options);
}
-static void send_everything(connection_t *c)
-{
+static void send_everything(connection_t *c) {
avl_node_t *node, *node2;
node_t *n;
subnet_t *s;
/* Send all known subnets and edges */
+ if(tunnelserver) {
+ for(node = myself->subnet_tree->head; node; node = node->next) {
+ s = node->data;
+ send_add_subnet(c, s);
+ }
+
+ return;
+ }
+
for(node = node_tree->head; node; node = node->next) {
- n = (node_t *) node->data;
+ n = node->data;
for(node2 = n->subnet_tree->head; node2; node2 = node2->next) {
- s = (subnet_t *) node2->data;
+ s = node2->data;
send_add_subnet(c, s);
}
for(node2 = n->edge_tree->head; node2; node2 = node2->next) {
- e = (edge_t *) node2->data;
+ e = node2->data;
send_add_edge(c, e);
}
}
}
-int ack_h(connection_t *c)
-{
+bool ack_h(connection_t *c) {
char hisport[MAX_STRING_SIZE];
char *hisaddress, *dummy;
- int weight;
- long int options;
+ int weight, mtu;
+ uint32_t options;
node_t *n;
+ bool choice;
- cp();
-
- if(sscanf(c->buffer, "%*d " MAX_STRING " %d %lx", hisport, &weight, &options) != 3) {
- logger(DEBUG_ALWAYS, LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name,
+ if(sscanf(c->buffer, "%*d " MAX_STRING " %d %x", hisport, &weight, &options) != 3) {
+ logger(LOG_ERR, "Got bad %s from %s (%s)", "ACK", c->name,
c->hostname);
- return -1;
+ return false;
}
/* Check if we already have a node_t for him */
} else {
if(n->connection) {
/* Oh dear, we already have a connection to this node. */
- logger(DEBUG_CONNECTIONS, LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"),
+ ifdebug(CONNECTIONS) logger(LOG_DEBUG, "Established a second connection with %s (%s), closing old connection",
n->name, n->hostname);
- terminate_connection(n->connection, 0);
+ terminate_connection(n->connection, false);
/* Run graph algorithm to purge key and make sure up/down scripts are rerun with new IP addresses and stuff */
graph();
}
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)
+ 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 = 1;
+ c->status.active = true;
- logger(DEBUG_CONNECTIONS, LOG_NOTICE, _("Connection with %s (%s) activated"), c->name,
+ ifdebug(CONNECTIONS) logger(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);
/* Notify everyone of the new edge */
- send_add_edge(broadcast, c->edge);
+ if(tunnelserver)
+ send_add_edge(c, c->edge);
+ else
+ send_add_edge(broadcast, c->edge);
/* Run MST and SSSP algorithms */
graph();
- return 0;
+ return true;
}
projects / tinc / blobdiff