Add sasl_usercloak module, to allow injecting SASL account name into a user's host on connection

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Stephen Bennett 2010-01-29 23:29:00 +00:00 committed by Ed Kellett
parent b21c1403c6
commit 721410d575
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2 changed files with 103 additions and 0 deletions

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@ -68,6 +68,7 @@ extension_LTLIBRARIES = \
no_kill_services.la \ no_kill_services.la \
no_locops.la \ no_locops.la \
no_oper_invis.la \ no_oper_invis.la \
sasl_usercloak.la \
spy_admin_notice.la \ spy_admin_notice.la \
spy_info_notice.la \ spy_info_notice.la \
spy_links_notice.la \ spy_links_notice.la \

102
extensions/sasl_usercloak.c Normal file
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@ -0,0 +1,102 @@
#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 <stdint.h>
static void check_new_user(void *data);
mapi_hfn_list_av1 sasl_usercloak_hfnlist[] = {
{ "new_local_user", (hookfn) check_new_user },
{ NULL, NULL }
};
DECLARE_MODULE_AV1(sasl_usercloak, NULL, NULL, NULL, NULL,
sasl_usercloak_hfnlist, "$Revision: 3526 $");
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)
{
struct Client *source_p = (void *)vdata;
if (!IsIPSpoof(source_p))
return;
if (EmptyString(source_p->user->suser))
return;
char *accountpart = strstr(source_p->host, "account");
if (!accountpart)
return;
char buf[HOSTLEN];
char *dst = buf;
strncpy(buf, source_p->host, accountpart - source_p->host);
dst += accountpart - source_p->host;
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->host);
return;
}
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->user, source_p->host);
return;
}
*dst++ = '/';
*dst++ = 'x';
*dst++ = '-';
unsigned int hashval = fnv_hash_string(source_p->user->suser);
hashval %= 100000000; // eight digits only please.
snprintf(dst, 9, "%08ud", hashval);
}
/* just in case */
buf[HOSTLEN-1] = '\0';
change_nick_user_host(source_p, source_p->name, source_p->username, buf, 0, "Changing host");
}