along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol.c,v 1.28.4.41 2000/10/16 16:33:30 guus Exp $
+ $Id: protocol.c,v 1.28.4.45 2000/10/24 15:46:17 guus Exp $
*/
#include "config.h"
}
else
{
- if(debug_lvl > DEBUG_PROTOCOL)
+ if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_DEBUG, _("Got %s from %s (%s)"),
request_name[request], cl->name, cl->hostname);
}
cp
cl->allow_request = CHALLENGE;
cp
- return send_request(cl, "%d %s %d %lx", ID, myself->name, myself->protocol_version, myself->options);
+ return send_request(cl, "%d %s %d %lx %hd", ID, myself->name, myself->protocol_version, myself->options, myself->port);
}
int id_h(conn_list_t *cl)
{
conn_list_t *old;
+ config_t *cfg;
cp
- if(sscanf(cl->buffer, "%*d %as %d %lx", &cl->name, &cl->protocol_version, &cl->options) != 3)
+ if(sscanf(cl->buffer, "%*d %as %d %lx %hd", &cl->name, &cl->protocol_version, &cl->options, &cl->port) != 4)
{
syslog(LOG_ERR, _("Got bad ID from %s"), cl->hostname);
return -1;
}
/* Load information about peer */
-
+cp
if(read_host_config(cl))
{
syslog(LOG_ERR, _("Peer %s had unknown identity (%s)"), cl->hostname, cl->name);
return -1;
}
-
/* First check if the host we connected to is already in our
connection list. If so, we are probably making a loop, which
is not desirable.
*/
-
+cp
if(cl->status.outgoing)
{
if((old = lookup_id(cl->name)))
- if(old != cl)
{
- if(debug_lvl > DEBUG_CONNECTIONS)
+ if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Uplink %s (%s) is already in our connection list"), cl->name, cl->hostname);
cl->status.outgoing = 0;
old->status.outgoing = 1;
return 0;
}
}
+cp
+ if(!(cfg = get_config_val(cl->config, publickey)))
+ {
+ syslog(LOG_ERR, _("No public key known for %s (%s)"), cl->name, cl->hostname);
+ return -1;
+ }
+ else
+ {
+cp
+ cl->rsa_key = RSA_new();
+ BN_hex2bn(&cl->rsa_key->n, cfg->data.ptr);
+ BN_hex2bn(&cl->rsa_key->e, "FFFF");
+ }
+
cp
return send_challenge(cl);
}
int send_challenge(conn_list_t *cl)
{
- char buffer[CHAL_LENGTH*2+1];
+ char *buffer;
+ int len, x;
cp
+ len = RSA_size(cl->rsa_key);
+
/* Allocate buffers for the challenge */
- if(!cl->hischallenge)
- cl->hischallenge = xmalloc(CHAL_LENGTH);
+ buffer = xmalloc(len*2+1);
+
+ if(cl->hischallenge)
+ free(cl->hischallenge);
+
+ cl->hischallenge = xmalloc(len);
cp
+ /* Seed the PRNG with urandom (can't afford to block) */
+
+ RAND_load_file("/dev/urandom", 1024);
+
/* Copy random data to the buffer */
- RAND_bytes(cl->hischallenge, CHAL_LENGTH);
+ RAND_bytes(cl->hischallenge, len);
+
+ cl->hischallenge[0] &= 0x7F; /* Somehow if the first byte is more than 0xD0 or something like that, decryption fails... */
+
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ {
+ bin2hex(cl->hischallenge, buffer, len);
+ buffer[len*2] = '\0';
+ syslog(LOG_DEBUG, _("Generated random challenge (unencrypted): %s"), buffer);
+ }
+
+ /* Encrypt the random data */
+
+ if(RSA_public_encrypt(len, cl->hischallenge, buffer, cl->rsa_key, RSA_NO_PADDING) != len) /* NO_PADDING because the message size equals the RSA key size and it is totally random */
+ {
+ syslog(LOG_ERR, _("Error during encryption of challenge for %s (%s)"), cl->name, cl->hostname);
+ free(buffer);
+ return -1;
+ }
cp
- /* Convert the random data to a hexadecimal formatted string */
+ /* Convert the encrypted random data to a hexadecimal formatted string */
- bin2hex(cl->hischallenge, buffer, CHAL_LENGTH);
- buffer[CHAL_LENGTH*2] = '\0';
+ bin2hex(buffer, buffer, len);
+ buffer[len*2] = '\0';
/* Send the challenge */
cl->allow_request = CHAL_REPLY;
+ x = send_request(cl, "%d %s", CHALLENGE, buffer);
+ free(buffer);
cp
- return send_request(cl, "%d %s", CHALLENGE, buffer);
+ return x;
}
int challenge_h(conn_list_t *cl)
{
char *buffer;
+ int len;
cp
if(sscanf(cl->buffer, "%*d %as", &buffer) != 1)
{
return -1;
}
+ len = RSA_size(myself->rsa_key);
+
/* Check if the length of the challenge is all right */
- if(strlen(buffer) != CHAL_LENGTH*2)
+ if(strlen(buffer) != len*2)
{
syslog(LOG_ERR, _("Intruder: wrong challenge length from %s (%s)"), cl->name, cl->hostname);
free(buffer);
/* Allocate buffers for the challenge */
if(!cl->mychallenge)
- cl->mychallenge = xmalloc(CHAL_LENGTH);
+ cl->mychallenge = xmalloc(len);
/* Convert the challenge from hexadecimal back to binary */
- hex2bin(buffer,cl->mychallenge,CHAL_LENGTH);
+ hex2bin(buffer,buffer,len);
+
+ /* Decrypt the challenge */
+
+ if(RSA_private_decrypt(len, buffer, cl->mychallenge, myself->rsa_key, RSA_NO_PADDING) != len) /* See challenge() */
+ {
+ syslog(LOG_ERR, _("Error during encryption of challenge for %s (%s)"), cl->name, cl->hostname);
+ free(buffer);
+ return -1;
+ }
+
+ if(debug_lvl >= DEBUG_SCARY_THINGS)
+ {
+ bin2hex(cl->mychallenge, buffer, len);
+ buffer[len*2] = '\0';
+ syslog(LOG_DEBUG, _("Received random challenge (unencrypted): %s"), buffer);
+ }
+
free(buffer);
/* Rest is done by send_chal_reply() */
/* Calculate the hash from the challenge we received */
- SHA1(cl->mychallenge, CHAL_LENGTH, hash);
+ SHA1(cl->mychallenge, RSA_size(myself->rsa_key), hash);
/* Convert the hash to a hexadecimal formatted string */
/* Calculate the hash from the challenge we sent */
- SHA1(cl->hischallenge, CHAL_LENGTH, myhash);
+ SHA1(cl->hischallenge, RSA_size(cl->rsa_key), myhash);
/* Verify the incoming hash with the calculated hash */
if(memcmp(hishash, myhash, SHA_DIGEST_LENGTH))
{
syslog(LOG_ERR, _("Intruder: wrong challenge reply from %s (%s)"), cl->name, cl->hostname);
+ 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);
+ }
free(hishash);
return -1;
}
+
free(hishash);
/* Identity has now been positively verified.
while((old = lookup_id(cl->name)))
{
- if(debug_lvl > DEBUG_CONNECTIONS)
+ if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Removing old entry for %s at %s in favour of new connection from %s"),
cl->name, old->hostname, cl->hostname);
old->status.active = 0;
cl->allow_request = ALL;
cl->status.active = 1;
- if(debug_lvl > DEBUG_CONNECTIONS)
+ if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Connection with %s (%s) activated"), cl->name, cl->hostname);
/* Exchange information about other tinc daemons */
notify_others(cl, NULL, send_add_host);
notify_one(cl);
*/
- upstreamindex = 0;
cp
if(cl->status.outgoing)
{
if((new->address == old->address) && (new->port == old->port))
{
- if(debug_lvl > DEBUG_CONNECTIONS)
+ if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Got duplicate ADD_HOST for %s (%s) from %s (%s)"),
old->name, old->hostname, new->name, new->hostname);
return 0;
}
else
{
- if(debug_lvl > DEBUG_CONNECTIONS)
+ if(debug_lvl >= DEBUG_CONNECTIONS)
syslog(LOG_NOTICE, _("Removing old entry for %s (%s)"),
old->name, old->hostname);
old->status.active = 0;
return -1;
}
- if(debug_lvl > DEBUG_STATUS)
+ if(debug_lvl >= DEBUG_STATUS)
{
syslog(LOG_NOTICE, _("Status message from %s (%s): %s: %s"),
cl->name, cl->hostname, status_text[statusno], statusstring);
return -1;
}
- if(debug_lvl > DEBUG_ERROR)
+ if(debug_lvl >= DEBUG_ERROR)
{
syslog(LOG_NOTICE, _("Error message from %s (%s): %s: %s"),
cl->name, cl->hostname, strerror(errno), errorstring);
projects / tinc / blobdiff