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xt_TARPIT: honeypot and reset modes

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Honeypot mode attempts to maintain a normal connection for the purpose
of capturing payload packets.

Reset mode provides the ability to send a reset packet in lieu of
using the DROP or REJECT targets.
This commit is contained in:
Martin Barrow Cliff
2011-05-27 18:53:02 -04:00
committed by Jan Engelhardt
parent 1a5c079e6b
commit fa1348455d
5 changed files with 235 additions and 43 deletions
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92
extensions/libxt_TARPIT.c
View File

@@ -1,34 +1,120 @@
/*
* "TARPIT" target extension to iptables
* this file is in the Public Domain
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License; either
* version 2 of the License, or any later version, as published by the
* Free Software Foundation.
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <getopt.h>
#include <string.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include "xt_TARPIT.h"
#include "compat_user.h"
enum {
F_TARPIT = 1 << 0,
F_HONEYPOT = 1 << 1,
F_RESET = 1 << 2,
};
static const struct option tarpit_tg_opts[] = {
{.name = "tarpit", .has_arg = false, .val = 't'},
{.name = "honeypot", .has_arg = false, .val = 'h'},
{.name = "reset", .has_arg = false, .val = 'r'},
{NULL},
};
static void tarpit_tg_help(void)
{
printf("TARPIT takes no options\n\n");
printf(
"TARPIT target options:\n"
" --tarpit Enable classic 0-window tarpit (default)\n"
" --honeypot Enable honeypot option\n"
" --reset Enable inline resets\n");
}
static int tarpit_tg_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_target **target)
{
return 0;
struct xt_tarpit_tginfo *info = (void *)(*target)->data;
switch (c) {
case 't':
info->variant = XTTARPIT_TARPIT;
*flags |= F_TARPIT;
return true;
case 'h':
info->variant = XTTARPIT_HONEYPOT;
*flags |= F_HONEYPOT;
return true;
case 'r':
info->variant = XTTARPIT_RESET;
*flags |= F_RESET;
return true;
}
return false;
}
static void tarpit_tg_check(unsigned int flags)
{
if (flags == (F_TARPIT | F_HONEYPOT | F_RESET))
xtables_error(PARAMETER_PROBLEM,
"TARPIT: only one action can be used at a time");
}
static void tarpit_tg_print(const void *ip,
const struct xt_entry_target *target, int numeric)
{
const struct xt_tarpit_tginfo *info = (void *)target->data;
switch (info->variant) {
case XTTARPIT_HONEYPOT:
printf(" honeypot mode ");
break;
case XTTARPIT_RESET:
printf(" reset mode ");
break;
default:
printf(" tarpit mode ");
break;
}
}
static void tarpit_tg_save(const void *ip,
const struct xt_entry_target *target)
{
const struct xt_tarpit_tginfo *info = (const void *)target->data;
switch (info->variant) {
case XTTARPIT_TARPIT:
printf(" --tarpit ");
break;
case XTTARPIT_HONEYPOT:
printf(" --honeypot ");
break;
case XTTARPIT_RESET:
printf(" --reset ");
break;
}
}
static struct xtables_target tarpit_tg_reg = {
.version = XTABLES_VERSION,
.name = "TARPIT",
.family = NFPROTO_IPV4,
.size = XT_ALIGN(sizeof(struct xt_tarpit_tginfo)),
.userspacesize = XT_ALIGN(sizeof(struct xt_tarpit_tginfo)),
.help = tarpit_tg_help,
.parse = tarpit_tg_parse,
.final_check = tarpit_tg_check,
.print = tarpit_tg_print,
.save = tarpit_tg_save,
.extra_opts = tarpit_tg_opts,
};
static __attribute__((constructor)) void tarpit_tg_ldr(void)