elemental-ircd/extensions/ip_cloaking-5.c

170 lines
4.2 KiB
C

/*
* Charybdis: an advanced ircd
* ip_cloaking.c: provide user hostname cloaking
*
* Written originally by nenolod, altered to use FNV by Elizabeth in 2008
* altered some more by groente
*/
#include <openssl/hmac.h>
#include "stdinc.h"
#include "modules.h"
#include "hook.h"
#include "client.h"
#include "ircd.h"
#include "send.h"
#include "hash.h"
#include "s_conf.h"
#include "s_user.h"
#include "s_serv.h"
#include "numeric.h"
#include "newconf.h"
char *secretsalt = "32qwnqoWI@DpMd&w";
static void
conf_set_secretsalt(void *data)
{
secretsalt = rb_strdup(data);
}
static int
_modinit(void)
{
/* add the usermode to the available slot */
user_modes['x'] = find_umode_slot();
construct_umodebuf();
add_top_conf("cloaking", NULL, NULL, NULL);
add_conf_item("cloaking", "secretsalt", CF_QSTRING, conf_set_secretsalt);
return 0;
}
static void
_moddeinit(void)
{
/* disable the umode and remove it from the available list */
user_modes['x'] = 0;
construct_umodebuf();
add_top_conf("cloaking", NULL, NULL, NULL);
add_conf_item("cloaking", "secretsalt", CF_QSTRING, conf_set_secretsalt);
}
static void check_umode_change(void *data);
static void check_new_user(void *data);
mapi_hfn_list_av1 ip_cloaking_hfnlist[] = {
{ "umode_changed", (hookfn) check_umode_change },
{ "new_local_user", (hookfn) check_new_user },
{ NULL, NULL }
};
DECLARE_MODULE_AV1(ip_cloaking, _modinit, _moddeinit, NULL, NULL,
ip_cloaking_hfnlist, "$Revision: 3526 $");
static void
distribute_hostchange(struct Client *client_p, char *newhost)
{
if (newhost != client_p->orighost)
sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
newhost);
else
sendto_one_numeric(client_p, RPL_HOSTHIDDEN, "%s :hostname reset",
newhost);
sendto_server(NULL, NULL,
CAP_EUID | CAP_TS6, NOCAPS, ":%s CHGHOST %s :%s",
use_id(&me), use_id(client_p), newhost);
sendto_server(NULL, NULL,
CAP_TS6, CAP_EUID, ":%s ENCAP * CHGHOST %s :%s",
use_id(&me), use_id(client_p), newhost);
change_nick_user_host(client_p, client_p->name, client_p->username, newhost, 0, "Changing host");
if (newhost != client_p->orighost)
SetDynSpoof(client_p);
else
ClearDynSpoof(client_p);
}
static void
do_host_cloak(const char *inbuf, char *outbuf)
{
unsigned char *hash;
char buf[3];
char output[HOSTLEN+1];
int i;
hash = HMAC(EVP_sha256(), secretsalt, strlen(secretsalt), (unsigned char*)inbuf, strlen(inbuf), NULL, NULL);
output[0]=0;
for (i = 0; i < 32; i++) {
sprintf(buf, "%.2x", hash[i]);
strcat(output,buf);
}
rb_strlcpy(outbuf,output,HOSTLEN+1);
}
static void
check_umode_change(void *vdata)
{
hook_data_umode_changed *data = (hook_data_umode_changed *)vdata;
struct Client *source_p = data->client;
if (!MyClient(source_p))
return;
/* didn't change +h umode, we don't need to do anything */
if (!((data->oldumodes ^ source_p->umodes) & user_modes['x']))
return;
if (source_p->umodes & user_modes['h'])
{
if (IsIPSpoof(source_p) || source_p->localClient->mangledhost == NULL || (IsDynSpoof(source_p) && strcmp(source_p->host, source_p->localClient->mangledhost)))
{
source_p->umodes &= ~user_modes['x'];
return;
}
if (strcmp(source_p->host, source_p->localClient->mangledhost))
{
distribute_hostchange(source_p, source_p->localClient->mangledhost);
}
else /* not really nice, but we need to send this numeric here */
sendto_one_numeric(source_p, RPL_HOSTHIDDEN, "%s :is now your hidden host",
source_p->host);
}
else if (!(source_p->umodes & user_modes['x']))
{
if (source_p->localClient->mangledhost != NULL &&
!strcmp(source_p->host, source_p->localClient->mangledhost))
{
distribute_hostchange(source_p, source_p->orighost);
}
}
}
static void
check_new_user(void *vdata)
{
struct Client *source_p = (void *)vdata;
if (IsIPSpoof(source_p))
{
source_p->umodes &= ~user_modes['x'];
return;
}
source_p->localClient->mangledhost = rb_malloc(HOSTLEN + 1);
do_host_cloak(source_p->orighost, source_p->localClient->mangledhost);
if (IsDynSpoof(source_p))
source_p->umodes &= ~user_modes['x'];
if (source_p->umodes & user_modes['x'])
{
rb_strlcpy(source_p->host, source_p->localClient->mangledhost, sizeof(source_p->host));
if (irccmp(source_p->host, source_p->orighost))
SetDynSpoof(source_p);
}
}