tinc/src/protocol_auth.c

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/*
protocol_auth.c -- handle the meta-protocol, authentication
Copyright (C) 1999-2005 Ivo Timmermans,
2012-03-10 12:23:08 +00:00
2000-2012 Guus Sliepen <guus@tinc-vpn.org>
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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
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
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.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
#include "system.h"
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#include <openssl/sha.h>
#include <openssl/rand.h>
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#include <openssl/err.h>
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#include <openssl/evp.h>
#include "avl_tree.h"
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#include "conf.h"
#include "connection.h"
#include "edge.h"
#include "graph.h"
#include "logger.h"
#include "meta.h"
#include "net.h"
#include "netutl.h"
#include "node.h"
#include "protocol.h"
#include "utils.h"
#include "xalloc.h"
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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(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)
strcpy(s4req + 8, 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);
strcpy(s5req + i, proxyuser);
i += strlen(proxyuser);
s5req[i++] = strlen(proxypass);
strcpy(s5req + i, 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(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(LOG_ERR, "Proxy type not implemented yet");
return false;
default:
logger(LOG_ERR, "Unknown proxy type");
return false;
}
}
bool send_id(connection_t *c) {
if(proxytype)
if(!send_proxyrequest(c))
return false;
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return send_request(c, "%d %s %d", ID, myself->connection->name,
myself->connection->protocol_version);
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}
bool id_h(connection_t *c) {
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char name[MAX_STRING_SIZE];
if(sscanf(c->buffer, "%*d " MAX_STRING " %d", name, &c->protocol_version) != 2) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "ID", c->name,
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c->hostname);
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return false;
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}
/* Check if identity is a valid name */
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if(!check_id(name)) {
logger(LOG_ERR, "Got bad %s from %s (%s): %s", "ID", c->name,
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c->hostname, "invalid name");
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return false;
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}
/* If this is an outgoing connection, make sure we are connected to the right host */
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if(c->outgoing) {
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if(strcmp(c->name, name)) {
logger(LOG_ERR, "Peer %s is %s instead of %s", c->hostname, name,
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c->name);
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return false;
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}
} else {
if(c->name)
free(c->name);
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c->name = xstrdup(name);
}
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/* Check if version matches */
if(c->protocol_version != myself->connection->protocol_version) {
logger(LOG_ERR, "Peer %s (%s) uses incompatible version %d",
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c->name, c->hostname, c->protocol_version);
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return false;
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}
if(bypass_security) {
if(!c->config_tree)
init_configuration(&c->config_tree);
c->allow_request = ACK;
return send_ack(c);
}
if(!c->config_tree) {
init_configuration(&c->config_tree);
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if(!read_connection_config(c)) {
logger(LOG_ERR, "Peer %s had unknown identity (%s)", c->hostname,
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c->name);
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return false;
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}
}
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if(!read_rsa_public_key(c)) {
return false;
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}
c->allow_request = METAKEY;
return send_metakey(c);
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}
bool send_metakey(connection_t *c) {
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bool x;
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int len = RSA_size(c->rsa_key);
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/* Allocate buffers for the meta key */
char buffer[2 * len + 1];
c->outkey = xrealloc(c->outkey, len);
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if(!c->outctx)
c->outctx = xmalloc_and_zero(sizeof(*c->outctx));
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/* Copy random data to the buffer */
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RAND_pseudo_bytes((unsigned char *)c->outkey, len);
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/* 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:
2^(k-1) <= modulus < 2^(k)
Where ^ means "to the power of", not "xor".
This means that to be sure, we must choose our message < 2^(k-1).
This can be done by setting the most significant bit to zero.
*/
c->outkey[0] &= 0x7F;
ifdebug(SCARY_THINGS) {
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bin2hex(c->outkey, buffer, len);
buffer[len * 2] = '\0';
logger(LOG_DEBUG, "Generated random meta key (unencrypted): %s",
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buffer);
}
/* Encrypt the random data
We do not use one of the PKCS padding schemes here.
This is allowed, because we encrypt a totally random string
with a length equal to that of the modulus of the RSA key.
*/
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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)",
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c->name, c->hostname);
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return false;
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}
/* Convert the encrypted random data to a hexadecimal formatted string */
bin2hex(buffer, buffer, len);
buffer[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) {
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if(!EVP_EncryptInit(c->outctx, c->outcipher,
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(unsigned char *)c->outkey + len - c->outcipher->key_len,
(unsigned char *)c->outkey + len - c->outcipher->key_len -
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c->outcipher->iv_len)) {
logger(LOG_ERR, "Error during initialisation of cipher for %s (%s): %s",
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c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
return false;
}
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c->status.encryptout = true;
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}
return x;
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}
bool metakey_h(connection_t *c) {
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char buffer[MAX_STRING_SIZE];
int cipher, digest, maclength, compression;
int len;
if(sscanf(c->buffer, "%*d %d %d %d %d " MAX_STRING, &cipher, &digest, &maclength, &compression, buffer) != 5) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "METAKEY", c->name,
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c->hostname);
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return false;
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}
len = RSA_size(myself->connection->rsa_key);
/* Check if the length of the meta key is all right */
if(strlen(buffer) != len * 2) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name, c->hostname, "wrong keylength");
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return false;
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}
/* Allocate buffers for the meta key */
c->inkey = xrealloc(c->inkey, len);
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if(!c->inctx)
c->inctx = xmalloc_and_zero(sizeof(*c->inctx));
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/* Convert the challenge from hexadecimal back to binary */
hex2bin(buffer, buffer, len);
/* Decrypt the meta key */
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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)",
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c->name, c->hostname);
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return false;
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}
ifdebug(SCARY_THINGS) {
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bin2hex(c->inkey, buffer, len);
buffer[len * 2] = '\0';
logger(LOG_DEBUG, "Received random meta key (unencrypted): %s", buffer);
}
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/* All incoming requests will now be encrypted. */
/* Check and lookup cipher and digest algorithms */
if(cipher) {
c->incipher = EVP_get_cipherbynid(cipher);
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if(!c->incipher) {
logger(LOG_ERR, "%s (%s) uses unknown cipher!", c->name, c->hostname);
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return false;
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}
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if(!EVP_DecryptInit(c->inctx, c->incipher,
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(unsigned char *)c->inkey + len - c->incipher->key_len,
(unsigned char *)c->inkey + len - c->incipher->key_len -
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c->incipher->iv_len)) {
logger(LOG_ERR, "Error during initialisation of cipher from %s (%s): %s",
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c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
return false;
}
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c->status.decryptin = true;
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} else {
c->incipher = NULL;
}
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c->inmaclength = maclength;
if(digest) {
c->indigest = EVP_get_digestbynid(digest);
if(!c->indigest) {
logger(LOG_ERR, "Node %s (%s) uses unknown digest!", c->name, c->hostname);
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return false;
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}
if(c->inmaclength > c->indigest->md_size || c->inmaclength < 0) {
logger(LOG_ERR, "%s (%s) uses bogus MAC length!", c->name, c->hostname);
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return false;
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}
} else {
c->indigest = NULL;
}
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c->incompression = compression;
c->allow_request = CHALLENGE;
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return send_challenge(c);
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}
bool send_challenge(connection_t *c) {
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/* CHECKME: what is most reasonable value for len? */
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int len = RSA_size(c->rsa_key);
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/* Allocate buffers for the challenge */
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char buffer[2 * len + 1];
c->hischallenge = xrealloc(c->hischallenge, len);
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/* Copy random data to the buffer */
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RAND_pseudo_bytes((unsigned char *)c->hischallenge, len);
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/* Convert to hex */
bin2hex(c->hischallenge, buffer, len);
buffer[len * 2] = '\0';
/* Send the challenge */
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return send_request(c, "%d %s", CHALLENGE, buffer);
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}
bool challenge_h(connection_t *c) {
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char buffer[MAX_STRING_SIZE];
int len;
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if(sscanf(c->buffer, "%*d " MAX_STRING, buffer) != 1) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "CHALLENGE", c->name,
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c->hostname);
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return false;
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}
len = RSA_size(myself->connection->rsa_key);
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/* 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,
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c->hostname, "wrong challenge length");
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return false;
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}
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/* Allocate buffers for the challenge */
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c->mychallenge = xrealloc(c->mychallenge, len);
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/* Convert the challenge from hexadecimal back to binary */
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hex2bin(buffer, c->mychallenge, len);
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c->allow_request = CHAL_REPLY;
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/* Rest is done by send_chal_reply() */
return send_chal_reply(c);
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}
bool send_chal_reply(connection_t *c) {
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char hash[EVP_MAX_MD_SIZE * 2 + 1];
EVP_MD_CTX ctx;
/* Calculate the hash from the challenge we received */
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if(!EVP_DigestInit(&ctx, c->indigest)
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|| !EVP_DigestUpdate(&ctx, c->mychallenge, RSA_size(myself->connection->rsa_key))
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|| !EVP_DigestFinal(&ctx, (unsigned char *)hash, NULL)) {
logger(LOG_ERR, "Error during calculation of response for %s (%s): %s",
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c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
return false;
}
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/* Convert the hash to a hexadecimal formatted string */
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bin2hex(hash, hash, c->indigest->md_size);
hash[c->indigest->md_size * 2] = '\0';
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/* Send the reply */
return send_request(c, "%d %s", CHAL_REPLY, hash);
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}
bool chal_reply_h(connection_t *c) {
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char hishash[MAX_STRING_SIZE];
char myhash[EVP_MAX_MD_SIZE];
EVP_MD_CTX ctx;
if(sscanf(c->buffer, "%*d " MAX_STRING, hishash) != 1) {
logger(LOG_ERR, "Got bad %s from %s (%s)", "CHAL_REPLY", c->name,
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c->hostname);
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return false;
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}
/* Check if the length of the hash is all right */
if(strlen(hishash) != c->outdigest->md_size * 2) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name,
c->hostname, "wrong challenge reply length");
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return false;
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}
/* Convert the hash to binary format */
hex2bin(hishash, hishash, c->outdigest->md_size);
/* Calculate the hash from the challenge we sent */
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if(!EVP_DigestInit(&ctx, c->outdigest)
|| !EVP_DigestUpdate(&ctx, c->hischallenge, RSA_size(c->rsa_key))
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|| !EVP_DigestFinal(&ctx, (unsigned char *)myhash, NULL)) {
logger(LOG_ERR, "Error during calculation of response from %s (%s): %s",
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c->name, c->hostname, ERR_error_string(ERR_get_error(), NULL));
return false;
}
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/* Verify the incoming hash with the calculated hash */
if(memcmp(hishash, myhash, c->outdigest->md_size)) {
logger(LOG_ERR, "Possible intruder %s (%s): %s", c->name,
c->hostname, "wrong challenge reply");
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ifdebug(SCARY_THINGS) {
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bin2hex(myhash, hishash, SHA_DIGEST_LENGTH);
hishash[SHA_DIGEST_LENGTH * 2] = '\0';
logger(LOG_DEBUG, "Expected challenge reply: %s", hishash);
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}
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return false;
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}
/* Identity has now been positively verified.
Send an acknowledgement with the rest of the information needed.
*/
c->allow_request = ACK;
return send_ack(c);
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}
bool send_ack(connection_t *c) {
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/* ACK message contains rest of the information the other end needs
to create node_t and edge_t structures. */
struct timeval now;
bool choice;
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/* Estimate weight */
gettimeofday(&now, NULL);
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c->estimated_weight = (now.tv_sec - c->start.tv_sec) * 1000 + (now.tv_usec - c->start.tv_usec) / 1000;
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/* 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)
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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);
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}
static void send_everything(connection_t *c) {
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avl_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;
}
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for(node = node_tree->head; node; node = node->next) {
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n = node->data;
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for(node2 = n->subnet_tree->head; node2; node2 = node2->next) {
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s = node2->data;
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send_add_subnet(c, s);
}
for(node2 = n->edge_tree->head; node2; node2 = node2->next) {
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e = node2->data;
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send_add_edge(c, e);
}
}
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}
bool ack_h(connection_t *c) {
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char hisport[MAX_STRING_SIZE];
char *hisaddress;
int weight, mtu;
uint32_t options;
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node_t *n;
bool choice;
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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,
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c->hostname);
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return false;
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}
/* Check if we already have a node_t for him */
n = lookup_node(c->name);
if(!n) {
n = new_node();
n->name = xstrdup(c->name);
node_add(n);
} 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",
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n->name, n->hostname);
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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();
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}
}
n->connection = c;
c->node = n;
if(!(c->options & options & OPTION_PMTU_DISCOVERY)) {
c->options &= ~OPTION_PMTU_DISCOVERY;
options &= ~OPTION_PMTU_DISCOVERY;
}
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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(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;
}
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/* Activate this connection */
c->allow_request = ALL;
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c->status.active = true;
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ifdebug(CONNECTIONS) logger(LOG_NOTICE, "Connection with %s (%s) activated", c->name,
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c->hostname);
/* Send him everything we know */
send_everything(c);
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/* Create an edge_t for this connection */
c->edge = new_edge();
c->edge->from = myself;
c->edge->to = n;
sockaddr2str(&c->address, &hisaddress, NULL);
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c->edge->address = str2sockaddr(hisaddress, hisport);
free(hisaddress);
c->edge->weight = (weight + c->estimated_weight) / 2;
c->edge->connection = c;
c->edge->options = c->options;
edge_add(c->edge);
/* Notify everyone of the new edge */
if(tunnelserver)
send_add_edge(c, c->edge);
else
send_add_edge(everyone, c->edge);
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/* Run MST and SSSP algorithms */
graph();
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return true;
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}