along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
- $Id: protocol.c,v 1.28.4.37 2000/10/11 13:42:52 guus Exp $
+ $Id: protocol.c,v 1.28.4.45 2000/10/24 15:46:17 guus Exp $
*/
#include "config.h"
int i;
for (i = 0; i < strlen(id); i++)
- {
- if(!isalpha(id[i]) && id[i] != '_')
- {
- return 0;
- }
- }
-
- return 1;
+ if(!isalnum(id[i]) && id[i] != '_')
+ return -1;
+
+ return 0;
}
/* Generic request routines - takes care of logging and error detection as well */
-int send_request(conn_list_t *cl, const char *format, int request, /*args*/ ...)
+int send_request(conn_list_t *cl, const char *format, ...)
{
va_list args;
- char buffer[MAXBUFSIZE+1];
- int len;
+ char buffer[MAXBUFSIZE];
+ int len, request;
cp
/* Use vsnprintf instead of vasprintf: faster, no memory fragmentation, cleanup is automatic,
and there is a limit on the input buffer anyway */
- va_start(args, request);
- len = vsnprintf(buffer, MAXBUFSIZE+1, format, args);
+ va_start(args, format);
+ len = vsnprintf(buffer, MAXBUFSIZE, format, args);
+ request = va_arg(args, int);
va_end(args);
- if(len < 0 || len > MAXBUFSIZE)
+ if(len < 0 || len > MAXBUFSIZE-1)
{
syslog(LOG_ERR, _("Output buffer overflow while sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
return -1;
}
+ len++;
+
if(debug_lvl >= DEBUG_PROTOCOL)
syslog(LOG_DEBUG, _("Sending %s to %s (%s)"), request_name[request], cl->name, cl->hostname);
+
cp
- return send_meta(cl, buffer, length);
+ return send_meta(cl, buffer, len);
}
int receive_request(conn_list_t *cl)
}
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);
}
int send_id(conn_list_t *cl)
{
cp
- return send_request(cl, "%d %s %d %lx", ID, myself->name, myself->protocol_version, myself->options);
+ cl->allow_request = CHALLENGE;
+cp
+ 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;
/* Check if identity is a valid name */
- if(!check_id(cl->name))
+ if(check_id(cl->name))
{
syslog(LOG_ERR, _("Peer %s uses invalid identity name"), cl->hostname);
return -1;
}
/* Load information about peer */
-
- if(!read_host_config(cl))
+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(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");
+ }
- /* Send a challenge to verify the identity */
-
- cl->allow_request = CHAL_REPLY;
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);
+ }
- /* Convert the random data to a hexadecimal formatted string */
+ /* 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 encrypted random data to a hexadecimal formatted string */
- bin2hex(cl->hischallenge,buffer,CHAL_LENGTH);
- buffer[keylength*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 */
char *hishash;
char myhash[SHA_DIGEST_LENGTH];
cp
- if(sscanf(cl->buffer, "%*d %as", &hishash) != 2)
+ if(sscanf(cl->buffer, "%*d %as", &hishash) != 1)
{
syslog(LOG_ERR, _("Got bad CHAL_REPLY from %s (%s)"), cl->name, cl->hostname);
free(hishash);
/* 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))
+ 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.
*/
cp
if(cl->status.outgoing)
- {
- cl->allow_request = ACK;
return send_ack(cl);
- }
else
- {
- cl->allow_request = CHALLENGE;
return send_id(cl);
- }
}
int send_ack(conn_list_t *cl)
{
+cp
+ cl->allow_request = ACK;
cp
return send_request(cl, "%d", ACK);
}
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 */
+/* FIXME: reprogram this.
notify_others(cl, NULL, send_add_host);
notify_one(cl);
-
- upstreamindex = 0;
+*/
cp
if(cl->status.outgoing)
/* Check if owner name is a valid */
- if(!check_id(name))
+ if(check_id(name))
{
syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
free(name); free(subnetstr);
/* Check if subnet string is valid */
- if((subnet = str2net(subnetstr)) == -1)
+ if(!(subnet = str2net(subnetstr)))
{
syslog(LOG_ERR, _("Got bad ADD_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
free(name); free(subnetstr);
/* Check if the owner of the new subnet is in the connection list */
- if(!(owner = lookup_id(name))
+ if(!(owner = lookup_id(name)))
{
syslog(LOG_ERR, _("Got ADD_SUBNET for %s from %s (%s) which is not in our connection list"),
name, cl->name, cl->hostname);
}
/* If everything is correct, add the subnet to the list of the owner */
+
+ subnet_add(owner, subnet);
cp
- return subnet_add(owner, subnet);
+ return 0;
}
int send_del_subnet(conn_list_t *cl, conn_list_t *other, subnet_t *subnet)
/* Check if owner name is a valid */
- if(!check_id(name))
+ if(check_id(name))
{
syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid identity name"), cl->name, cl->hostname);
free(name); free(subnetstr);
/* Check if subnet string is valid */
- if((subnet = str2net(subnetstr)) == -1)
+ if(!(subnet = str2net(subnetstr)))
{
syslog(LOG_ERR, _("Got bad DEL_SUBNET from %s (%s): invalid subnet string"), cl->name, cl->hostname);
free(name); free(subnetstr);
/* Check if the owner of the new subnet is in the connection list */
- if(!(owner = lookup_id(name))
+ if(!(owner = lookup_id(name)))
{
syslog(LOG_ERR, _("Got DEL_SUBNET for %s from %s (%s) which is not in our connection list"),
name, cl->name, cl->hostname);
return -1;
}
- /* If everything is correct, add the subnet to the list of the owner */
+ /* If everything is correct, delete the subnet from the list of the owner */
+
+ subnet_del(subnet);
cp
- return subnet_del(owner, subnet);
+ return 0;
}
/* New and closed connections notification */
{
cp
return send_request(cl, "%d %s %s %lx:%d %lx", ADD_HOST,
- myself->name, other->name, other->real_ip, other->port, other->options);
+ myself->name, other->name, other->address, other->port, other->options);
}
int add_host_h(conn_list_t *cl)
/* Check if identity is a valid name */
- if(!check_id(new->name) || !check_id(sender))
+ if(check_id(new->name) || check_id(sender))
{
syslog(LOG_ERR, _("Got bad ADD_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
free(sender);
/* Lookup his uplink */
- if(!(new->hisuplink = lookup_id(sender))
+ if(!(new->hisuplink = lookup_id(sender)))
{
syslog(LOG_ERR, _("Got ADD_HOST from %s (%s) with origin %s which is not in our connection list"),
sender, cl->name, cl->hostname);
/* Fill in more of the new conn_list structure */
- new->hostname = hostlookup(htonl(new->real_ip));
+ new->hostname = hostlookup(htonl(new->address));
/* Check if the new host already exists in the connnection list */
if((old = lookup_id(new->name)))
{
- if((new->real_ip == old->real_ip) && (new->port == old->port))
+ 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;
conn_list_add(conn_list, new);
/* Tell the rest about the new host */
-
+/* FIXME: reprogram this.
notify_others(new, cl, send_add_host);
-
+*/
cp
return 0;
}
{
cp
return send_request(cl, "%d %s %s %lx:%d %lx", DEL_HOST,
- myself->name, other->name, other->real_ip, other->port, other->options);
+ myself->name, other->name, other->address, other->port, other->options);
}
int del_host_h(conn_list_t *cl)
/* Check if identity is a valid name */
- if(!check_id(name) || !check_id(sender))
+ if(check_id(name) || check_id(sender))
{
syslog(LOG_ERR, _("Got bad DEL_HOST from %s (%s): invalid identity name"), cl->name, cl->hostname);
free(name); free(sender);
/* Lookup his uplink */
- if(!(hisuplink = lookup_id(sender))
+ if(!(hisuplink = lookup_id(sender)))
{
syslog(LOG_ERR, _("Got DEL_HOST from %s (%s) with origin %s which is not in our connection list"),
cl->name, cl->hostname, sender);
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);
cp
if(sscanf(cl->buffer, "%*d %d %as", &errno, &errorstring) != 2)
{
- syslog(LOG_ERR, _("Got bad error from %s (%s)"),
+ syslog(LOG_ERR, _("Got bad ERROR from %s (%s)"),
cl->name, cl->hostname);
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);
if(!strcmp(to_id, myself->name))
{
- send_ans_key(myself, from, myself->datakey->key);
+ send_ans_key(myself, from, myself->cipher_pktkey);
}
else
{
return 0;
}
-int send_ans_key(conn_list_t *from, conn_list_t *to, char *datakey)
+int send_ans_key(conn_list_t *from, conn_list_t *to, char *pktkey)
{
cp
return send_request(to->nexthop, "%d %s %s %s", ANS_KEY,
- from->name, to->name, datakey);
+ from->name, to->name, pktkey);
}
int ans_key_h(conn_list_t *cl)
{
- char *from_id, *to_id, *datakey;
+ char *from_id, *to_id, *pktkey;
int keylength;
conn_list_t *from, *to;
cp
- if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &datakey) != 3)
+ if(sscanf(cl->buffer, "%*d %as %as %as", &from_id, &to_id, &pktkey) != 3)
{
syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s)"),
cl->name, cl->hostname);
{
syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) origin %s which does not exist in our connection list"),
cl->name, cl->hostname, from_id);
- free(from_id); free(to_id); free(datakey);
+ free(from_id); free(to_id); free(pktkey);
return -1;
}
{
/* It is for us, convert it to binary and set the key with it. */
- keylength = strlen(datakey);
+ keylength = strlen(pktkey);
if((keylength%2) || (keylength <= 0))
{
syslog(LOG_ERR, _("Got bad ANS_KEY from %s (%s) origin %s: invalid key"),
cl->name, cl->hostname, from->name);
- free(from_id); free(to_id); free(datakey);
+ free(from_id); free(to_id); free(pktkey);
return -1;
}
keylength /= 2;
- hex2bin(datakey, datakey, keylength);
- BF_set_key(cl->datakey, keylength, datakey);
+ hex2bin(pktkey, pktkey, keylength);
+ BF_set_key(cl->cipher_pktkey, keylength, pktkey);
}
else
{
{
syslog(LOG_ERR, _("Got ANS_KEY from %s (%s) destination %s which does not exist in our connection list"),
cl->name, cl->hostname, to_id);
- free(from_id); free(to_id); free(datakey);
+ free(from_id); free(to_id); free(pktkey);
return -1;
}
- send_ans_key(from, to, datakey);
+ send_ans_key(from, to, pktkey);
}
- free(from_id); free(to_id); free(datakey);
+ free(from_id); free(to_id); free(pktkey);
cp
return 0;
}
"ADD_SUBNET", "DEL_SUBNET",
"KEY_CHANGED", "REQ_KEY", "ANS_KEY",
};
+
+/* Status strings */
+
+char (*status_text[]) = {
+ "Warning",
+};
+
+/* Error strings */
+
+char (*error_text[]) = {
+ "Error",
+};
projects / tinc / blobdiff