/usr/src/xtables-addons-2.12/extensions/libxt_psd.c is in xtables-addons-dkms 2.12-0.1.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 | /*
Shared library add-on to iptables to add PSD support
Copyright (C) 2000,2001 astaro AG
This file is distributed under the terms of the GNU General Public
License (GPL). Copies of the GPL can be obtained from:
ftp://prep.ai.mit.edu/pub/gnu/GPL
2000-05-04 Markus Hennig <hennig@astaro.de> : initial
2000-08-18 Dennis Koslowski <koslowski@astaro.de> : first release
2000-12-01 Dennis Koslowski <koslowski@astaro.de> : UDP scans detection added
2001-02-04 Jan Rekorajski <baggins@pld.org.pl> : converted from target to match
2003-03-02 Harald Welte <laforge@netfilter.org>: fix 'storage' bug
2008-04-03 Mohd Nawawi <nawawi@tracenetworkcorporation.com>: update to 2.6.24 / 1.4 code
2008-06-24 Mohd Nawawi <nawawi@tracenetworkcorporation.com>: update to 2.6.24 / 1.4.1 code
2009-08-07 Mohd Nawawi Mohamad Jamili <nawawi@tracenetworkcorporation.com> : ported to xtables-addons
*/
#include <stdbool.h>
#include <stdint.h>
#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <getopt.h>
#include <xtables.h>
#include <linux/netfilter/x_tables.h>
#include "xt_psd.h"
#include "compat_user.h"
#define SCAN_DELAY_THRESHOLD 300
/* Function which prints out usage message. */
static void psd_mt_help(void) {
printf(
"psd match options:\n"
" --psd-weight-threshold threshhold Portscan detection weight threshold\n"
" --psd-delay-threshold delay Portscan detection delay threshold\n"
" --psd-lo-ports-weight lo Privileged ports weight\n"
" --psd-hi-ports-weight hi High ports weight\n\n");
}
static const struct option psd_mt_opts[] = {
{.name = "psd-weight-threshold", .has_arg = true, .val = '1'},
{.name = "psd-delay-threshold", .has_arg = true, .val = '2'},
{.name = "psd-lo-ports-weight", .has_arg = true, .val = '3'},
{.name = "psd-hi-ports-weight", .has_arg = true, .val = '4'},
{NULL}
};
/* Initialize the target. */
static void psd_mt_init(struct xt_entry_match *match) {
struct xt_psd_info *psdinfo = (struct xt_psd_info *)match->data;
psdinfo->weight_threshold = SCAN_WEIGHT_THRESHOLD;
psdinfo->delay_threshold = SCAN_DELAY_THRESHOLD;
psdinfo->lo_ports_weight = PORT_WEIGHT_PRIV;
psdinfo->hi_ports_weight = PORT_WEIGHT_HIGH;
}
#define XT_PSD_OPT_CTRESH 0x01
#define XT_PSD_OPT_DTRESH 0x02
#define XT_PSD_OPT_LPWEIGHT 0x04
#define XT_PSD_OPT_HPWEIGHT 0x08
static int psd_mt_parse(int c, char **argv, int invert, unsigned int *flags,
const void *entry, struct xt_entry_match **match)
{
struct xt_psd_info *psdinfo = (struct xt_psd_info *)(*match)->data;
unsigned int num;
switch (c) {
/* PSD-weight-threshold */
case '1':
if (*flags & XT_PSD_OPT_CTRESH)
xtables_error(PARAMETER_PROBLEM,"Can't specify --psd-weight-threshold twice");
if (!xtables_strtoui(optarg, NULL, &num, 0, PSD_MAX_RATE))
xtables_error(PARAMETER_PROBLEM, "bad --psd-weight-threshold '%s'", optarg);
psdinfo->weight_threshold = num;
*flags |= XT_PSD_OPT_CTRESH;
return true;
/* PSD-delay-threshold */
case '2':
if (*flags & XT_PSD_OPT_DTRESH)
xtables_error(PARAMETER_PROBLEM, "Can't specify --psd-delay-threshold twice");
if (!xtables_strtoui(optarg, NULL, &num, 0, PSD_MAX_RATE))
xtables_error(PARAMETER_PROBLEM, "bad --psd-delay-threshold '%s'", optarg);
psdinfo->delay_threshold = num;
*flags |= XT_PSD_OPT_DTRESH;
return true;
/* PSD-lo-ports-weight */
case '3':
if (*flags & XT_PSD_OPT_LPWEIGHT)
xtables_error(PARAMETER_PROBLEM, "Can't specify --psd-lo-ports-weight twice");
if (!xtables_strtoui(optarg, NULL, &num, 0, PSD_MAX_RATE))
xtables_error(PARAMETER_PROBLEM, "bad --psd-lo-ports-weight '%s'", optarg);
psdinfo->lo_ports_weight = num;
*flags |= XT_PSD_OPT_LPWEIGHT;
return true;
/* PSD-hi-ports-weight */
case '4':
if (*flags & XT_PSD_OPT_HPWEIGHT)
xtables_error(PARAMETER_PROBLEM, "Can't specify --psd-hi-ports-weight twice");
if (!xtables_strtoui(optarg, NULL, &num, 0, PSD_MAX_RATE))
xtables_error(PARAMETER_PROBLEM, "bad --psd-hi-ports-weight '%s'", optarg);
psdinfo->hi_ports_weight = num;
*flags |= XT_PSD_OPT_HPWEIGHT;
return true;
}
return false;
}
/* Final check; nothing. */
static void psd_mt_final_check(unsigned int flags) {}
static void psd_mt_save(const void *ip, const struct xt_entry_match *match)
{
const struct xt_psd_info *psdinfo = (const struct xt_psd_info *)match->data;
printf(" --psd-weight-threshold %u ", psdinfo->weight_threshold);
printf("--psd-delay-threshold %u ", psdinfo->delay_threshold);
printf("--psd-lo-ports-weight %u ", psdinfo->lo_ports_weight);
printf("--psd-hi-ports-weight %u ", psdinfo->hi_ports_weight);
}
static void psd_mt_print(const void *ip, const struct xt_entry_match *match, int numeric)
{
printf(" -m psd");
psd_mt_save(ip, match);
}
static struct xtables_match psd_mt_reg = {
.name = "psd",
.version = XTABLES_VERSION,
.revision = 1,
.family = NFPROTO_UNSPEC,
.size = XT_ALIGN(sizeof(struct xt_psd_info)),
.userspacesize = XT_ALIGN(sizeof(struct xt_psd_info)),
.help = psd_mt_help,
.init = psd_mt_init,
.parse = psd_mt_parse,
.final_check = psd_mt_final_check,
.print = psd_mt_print,
.save = psd_mt_save,
.extra_opts = psd_mt_opts,
};
static __attribute__((constructor)) void psd_mt_ldr(void)
{
xtables_register_match(&psd_mt_reg);
}
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