solanum/extensions/sasl_usercloak.c

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#include "stdinc.h"
#include "modules.h"
#include "hook.h"
#include "client.h"
#include "hostmask.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 <stdint.h>
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static const char sasl_usercloak_desc[] =
"Insert the SASL account name into certain iline spoofed hosts";
static void check_new_user(void *data);
mapi_hfn_list_av1 sasl_usercloak_hfnlist[] = {
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{ "new_local_user", check_new_user },
{ NULL, NULL }
};
unsigned int fnv_hash_string(char *str)
{
unsigned int hash = 0x811c9dc5; // Magic value for 32-bit fnv1 hash initialisation.
unsigned char *p = (unsigned char *)str;
while (*p)
{
hash += (hash<<1) + (hash<<4) + (hash<<7) + (hash<<8) + (hash<<24);
hash ^= *p++;
}
return hash;
}
static void
check_new_user(void *vdata)
{
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struct Client *source_p = vdata;
if (IsAnyDead(source_p))
return;
if (!IsIPSpoof(source_p))
return;
if (EmptyString(source_p->user->suser))
return;
char *accountpart = strstr(source_p->orighost, "/account");
if (!accountpart || accountpart[8] != '\0')
return;
accountpart += 1;
char buf[HOSTLEN];
memset(buf, 0, sizeof(buf));
char *dst = buf;
strncpy(buf, source_p->orighost, accountpart - source_p->orighost);
dst += accountpart - source_p->orighost;
int needhash = 0;
for (char *src = source_p->user->suser; *src ; src++ )
{
if (dst >= buf + sizeof(buf))
{
/* Doesn't fit. Warn opers and bail. */
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Couldn't fit account name part %s in hostname for %s!%s@%s",
source_p->user->suser, source_p->name, source_p->username, source_p->orighost);
return;
}
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char c = tolower(*src);
if (IsHostChar(c))
*dst++ = c;
else
needhash = 1;
}
if (needhash)
{
if (dst > buf + sizeof(buf) - 12) /* '/x-' plus eight digit hash plus null terminator */
{
/* Doesn't fit. Warn opers and bail. */
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Couldn't fit account name part %s in hostname for %s!%s@%s",
source_p->user->suser, source_p->name, source_p->username, source_p->orighost);
return;
}
*dst++ = '/';
*dst++ = 'x';
*dst++ = '-';
unsigned int hashval = fnv_hash_string(source_p->user->suser);
hashval %= 100000000; // eight digits only please.
snprintf(dst, 9, "%08u", hashval);
}
/* just in case */
buf[HOSTLEN-1] = '\0';
/* If hostname has been changed already (probably by services cloak on SASL login), then
* leave it intact. If not, change it. In either case, update the original hostname.
*/
if (0 == irccmp(source_p->host, source_p->orighost))
change_nick_user_host(source_p, source_p->name, source_p->username, buf, 0, "Changing host");
strncpy(source_p->orighost, buf, HOSTLEN);
{
struct ConfItem *aconf = find_kline(source_p);
if(aconf == NULL)
return;
if(IsExemptKline(source_p))
{
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"KLINE over-ruled for %s, client is kline_exempt [%s@%s]",
get_client_name(source_p, HIDE_IP),
aconf->user, aconf->host);
return;
}
sendto_realops_snomask(SNO_BANNED, L_NETWIDE,
"Rejecting K-Lined user %s [%s] (%s@%s)", get_client_name(source_p, HIDE_IP),
show_ip(NULL, source_p) ? source_p->sockhost : "255.255.255.255", aconf->user, aconf->host);
notify_banned_client(source_p, aconf, K_LINED);
}
}
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DECLARE_MODULE_AV2(sasl_usercloak, NULL, NULL, NULL, NULL, sasl_usercloak_hfnlist, NULL, NULL, sasl_usercloak_desc);