/*
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
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 1.1.4.20 2003/07/06 17:15:25 guus Exp $
+ $Id$
*/
-#include "config.h"
-
-#include <stdlib.h>
-#include <string.h>
-#include <syslog.h>
-#include <stdio.h>
-#include <stdarg.h>
-#include <errno.h>
-
-#include <utils.h>
-#include <xalloc.h>
-#include <avl_tree.h>
-
-#include <openssl/sha.h>
-#include <openssl/rand.h>
-#include <openssl/evp.h>
+#include "system.h"
+#include "splay_tree.h"
#include "conf.h"
-#include "net.h"
-#include "netutl.h"
-#include "protocol.h"
-#include "meta.h"
#include "connection.h"
-#include "node.h"
+#include "crypto.h"
#include "edge.h"
#include "graph.h"
+#include "logger.h"
+#include "net.h"
+#include "netutl.h"
+#include "node.h"
+#include "protocol.h"
+#include "rsa.h"
+#include "utils.h"
+#include "xalloc.h"
-#include "system.h"
-
-int send_id(connection_t *c)
-{
+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 id_h(connection_t *c)
-{
+bool id_h(connection_t *c, char *request) {
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,
+ if(sscanf(request, "%*d " MAX_STRING " %d", name, &c->protocol_version) != 2) {
+ 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)) {
- syslog(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)) {
- syslog(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) {
- syslog(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) {
- syslog(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;
+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();
- len = RSA_size(c->rsa_key);
-
- /* Allocate buffers for the meta key */
-
- if(!c->outkey)
- c->outkey = xmalloc(len);
+ if(!cipher_open_blowfish_ofb(&c->outcipher))
+ return false;
+
+ if(!digest_open_sha1(&c->outdigest, -1))
+ return false;
- if(!c->outctx)
- c->outctx = xmalloc_and_zero(sizeof(*c->outctx));
- cp();
- /* Copy random data to the buffer */
+ /* Create a random key */
- RAND_bytes(c->outkey, len);
+ randomize(key, 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:
This can be done by setting the most significant bit to zero.
*/
- c->outkey[0] &= 0x7F;
+ key[0] &= 0x7F;
+
+ cipher_set_key_from_rsa(&c->outcipher, key, len, true);
- 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);
+ ifdebug(SCARY_THINGS) {
+ bin2hex(key, hexkey, len);
+ hexkey[len * 2] = '\0';
+ logger(LOG_DEBUG, _("Generated random meta key (unencrypted): %s"), hexkey);
}
/* Encrypt the random data
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;
+ 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);
+ return false;
}
/* Convert the encrypted random data to a hexadecimal formatted string */
- bin2hex(buffer, buffer, len);
- buffer[len * 2] = '\0';
+ bin2hex(enckey, hexkey, len);
+ hexkey[len * 2] = '\0';
/* Send the meta key */
- x = send_request(c, "%d %d %d %d %d %s", METAKEY,
- c->outcipher ? c->outcipher->nid : 0,
- c->outdigest ? c->outdigest->type : 0, c->outmaclength,
- c->outcompression, buffer);
-
- /* 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);
-
- c->status.encryptout = 1;
- }
-
- return x;
+ bool result = send_request(c, "%d %d %d %d %d %s", METAKEY,
+ cipher_get_nid(&c->outcipher),
+ digest_get_nid(&c->outdigest), c->outmaclength,
+ c->outcompression, hexkey);
+
+ c->status.encryptout = true;
+ return result;
}
-int metakey_h(connection_t *c)
-{
- char buffer[MAX_STRING_SIZE];
+bool metakey_h(connection_t *c, char *request) {
+ char hexkey[MAX_STRING_SIZE];
int cipher, digest, maclength, compression;
- int len;
+ size_t len = rsa_size(&myself->connection->rsa);
+ char enckey[len];
+ char key[len];
cp();
- if(sscanf(c->buffer, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, buffer) != 5) {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "METAKEY", c->name,
- c->hostname);
- return -1;
+ 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);
+ 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) {
- syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong keylength");
- return -1;
+ if(strlen(hexkey) != len * 2) {
+ 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);
-
- if(!c->inctx)
- c->inctx = xmalloc_and_zero(sizeof(*c->inctx));
-
/* Convert the challenge from hexadecimal back to binary */
- hex2bin(buffer, buffer, len);
+ hex2bin(hexkey, enckey, len);
/* Decrypt the meta key */
- 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(!rsa_private_decrypt(&myself->connection->rsa, enckey, len, key)) {
+ logger(LOG_ERR, _("Error during decryption of meta key for %s (%s)"), c->name, c->hostname);
+ return false;
}
- 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);
+ ifdebug(SCARY_THINGS) {
+ bin2hex(key, hexkey, len);
+ hexkey[len * 2] = '\0';
+ logger(LOG_DEBUG, _("Received random meta key (unencrypted): %s"), hexkey);
}
- /* All incoming requests will now be encrypted. */
-
/* Check and lookup cipher and digest algorithms */
- if(cipher) {
- c->incipher = EVP_get_cipherbynid(cipher);
-
- if(!c->incipher) {
- syslog(LOG_ERR, _("%s (%s) uses unknown cipher!"), c->name, c->hostname);
- return -1;
- }
-
- EVP_DecryptInit(c->inctx, c->incipher,
- c->inkey + len - c->incipher->key_len,
- c->inkey + len - c->incipher->key_len -
- c->incipher->iv_len);
-
- c->status.decryptin = 1;
- } else {
- c->incipher = NULL;
+ 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);
+ return false;
}
- c->inmaclength = maclength;
-
- if(digest) {
- c->indigest = EVP_get_digestbynid(digest);
-
- if(!c->indigest) {
- syslog(LOG_ERR, _("Node %s (%s) uses unknown digest!"), c->name, c->hostname);
- return -1;
- }
-
- if(c->inmaclength > c->indigest->md_size || c->inmaclength < 0) {
- syslog(LOG_ERR, _("%s (%s) uses bogus MAC length!"), c->name, c->hostname);
- return -1;
- }
- } else {
- c->indigest = NULL;
+ if(!digest_open_by_nid(&c->indigest, digest, -1)) {
+ logger(LOG_ERR, _("Error during initialisation of digest from %s (%s)"), c->name, c->hostname);
+ return false;
}
- c->incompression = compression;
+ c->status.decryptin = true;
c->allow_request = CHALLENGE;
return send_challenge(c);
}
-int send_challenge(connection_t *c)
-{
- char buffer[MAX_STRING_SIZE];
- int len, x;
+bool send_challenge(connection_t *c) {
+ size_t len = rsa_size(&c->rsa);
+ char buffer[len * 2 + 1];
cp();
- /* 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);
+ c->hischallenge = xrealloc(c->hischallenge, len);
/* Copy random data to the buffer */
- RAND_bytes(c->hischallenge, len);
+ randomize(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 *request) {
char buffer[MAX_STRING_SIZE];
- int len;
+ size_t len = rsa_size(&myself->connection->rsa);
+ size_t digestlen = digest_length(&c->outdigest);
+ char digest[digestlen];
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;
+ if(sscanf(request, "%*d " MAX_STRING, buffer) != 1) {
+ logger(LOG_ERR, _("Got bad %s from %s (%s)"), "CHALLENGE", c->name, c->hostname);
+ return false;
}
- len = RSA_size(myself->connection->rsa_key);
-
/* Check if the length of the challenge is all right */
if(strlen(buffer) != len * 2) {
- syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
- c->hostname, "wrong challenge length");
- return -1;
+ logger(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name, c->hostname, "wrong challenge length");
+ return false;
}
- /* 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);
+ hex2bin(buffer, buffer, len);
c->allow_request = CHAL_REPLY;
- /* Rest is done by send_chal_reply() */
-
- return send_chal_reply(c);
-}
-
-int 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);
+ digest_create(&c->indigest, buffer, len, digest);
/* Convert the hash to a hexadecimal formatted string */
- bin2hex(hash, hash, c->indigest->md_size);
- hash[c->indigest->md_size * 2] = '\0';
+ bin2hex(digest, buffer, digestlen);
+ buffer[digestlen * 2] = '\0';
/* Send the reply */
- return send_request(c, "%d %s", CHAL_REPLY, hash);
+ return send_request(c, "%d %s", CHAL_REPLY, buffer);
}
-int chal_reply_h(connection_t *c)
-{
+bool chal_reply_h(connection_t *c, char *request) {
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) {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "CHAL_REPLY", c->name,
+ if(sscanf(request, "%*d " MAX_STRING, hishash) != 1) {
+ 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) {
- syslog(LOG_ERR, _("Possible intruder %s (%s): %s"), c->name,
- c->hostname, _("wrong challenge reply length"));
- return -1;
+ if(strlen(hishash) != digest_length(&c->outdigest) * 2) {
+ logger(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, c->outdigest->md_size);
-
- /* Calculate the hash from the challenge we sent */
+ hex2bin(hishash, hishash, digest_length(&c->outdigest));
- EVP_DigestInit(&ctx, c->outdigest);
- EVP_DigestUpdate(&ctx, c->hischallenge, RSA_size(c->rsa_key));
- EVP_DigestFinal(&ctx, myhash, NULL);
+ /* Verify the hash */
- /* Verify the incoming hash with the calculated hash */
-
- if(memcmp(hishash, myhash, c->outdigest->md_size)) {
- 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;
+ 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"));
+ return false;
}
/* Identity has now been positively verified.
Send an acknowledgement with the rest of the information needed.
*/
+ free(c->hischallenge);
+ c->hischallenge = NULL;
c->allow_request = ACK;
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;
+ bool choice;
cp();
/* 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;
+
+ /* 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;
+
+ get_config_int(lookup_config(c->config_tree, "Weight"), &c->estimated_weight);
- return x;
+ return send_request(c, "%d %s %d %lx", ACK, myport, c->estimated_weight, c->options);
}
-void send_everything(connection_t *c)
-{
- avl_node_t *node, *node2;
+static void send_everything(connection_t *c) {
+ splay_node_t *node, *node2;
node_t *n;
subnet_t *s;
edge_t *e;
/* 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 *request) {
char hisport[MAX_STRING_SIZE];
char *hisaddress, *dummy;
- int weight;
+ int weight, mtu;
long int options;
node_t *n;
cp();
- if(sscanf
- (c->buffer, "%*d " MAX_STRING " %d %lx", hisport, &weight, &options) != 3) {
- syslog(LOG_ERR, _("Got bad %s from %s (%s)"), "ACK", c->name,
+ if(sscanf(request, "%*d " MAX_STRING " %d %lx", 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. */
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(LOG_DEBUG, _("Established a second connection with %s (%s), closing old connection"),
- n->name, n->hostname);
- terminate_connection(n->connection, 0);
+ ifdebug(CONNECTIONS) logger(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!"));
+ else
+ c->outgoing = n->connection->outgoing;
+
+ n->connection->outgoing = NULL;
+ }
+
+ 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;
+
/* Activate this connection */
c->allow_request = ALL;
- c->status.active = 1;
+ c->status.active = true;
- if(debug_lvl >= DEBUG_CONNECTIONS)
- syslog(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 */
/* 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;
}