current/SOURCES/libipt_psd.c

/* 
  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
  2008-06-25 Luiz Capitulino <lcapitulino@mandriva.com.br>: converted from
  target to match again (target interface has been added back someway)
*/

#include <stdio.h>
#include <netdb.h>
#include <string.h>
#include <stdlib.h>
#include <syslog.h>
#include <getopt.h>
#include <iptables.h>
#include <linux/netfilter_ipv4/ip_tables.h>
#include <linux/netfilter_ipv4/ipt_psd.h>


/* Function which prints out usage message. */
static void
psd_help(void)
{
        printf(
"psd options:\n"
" --psd-weight-threshold threshhold  Portscan detection weight threshold\n\n"
" --psd-delay-threshold  delay       Portscan detection delay threshold\n\n"
" --psd-lo-ports-weight  lo          Privileged ports weight\n\n"
" --psd-hi-ports-weight  hi          High ports weight\n\n");
}

static struct option psd_opts[] = {
        { "psd-weight-threshold", 1, 0, '1' },
        { "psd-delay-threshold", 1, 0, '2' },
        { "psd-lo-ports-weight", 1, 0, '3' },
        { "psd-hi-ports-weight", 1, 0, '4' },
        { 0 }
};

/* Initialize the target. */
static void
psd_init(struct xt_entry_match *m)
{
        struct ipt_psd_info *psdinfo = (struct ipt_psd_info *)m->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;
}


typedef struct _code {
        char    *c_name;
        int     c_val;
} CODE;


#define IPT_PSD_OPT_CTRESH 0x01
#define IPT_PSD_OPT_DTRESH 0x02
#define IPT_PSD_OPT_LPWEIGHT 0x04
#define IPT_PSD_OPT_HPWEIGHT 0x08

/* Function which parses command options; returns true if it
   ate an option */
static int
psd_parse(int c, char **argv, int invert, unsigned int *flags,
          const void *entry, struct xt_entry_match **match)
{
        struct ipt_psd_info *psdinfo = (struct ipt_psd_info *)(*match)->data;
        unsigned int num;
        
        switch (c) {
        /* PSD-weight-threshold */
        case '1':
                if (*flags & IPT_PSD_OPT_CTRESH)
                        xtables_error(PARAMETER_PROBLEM,
                                   "Can't specify --psd-weight-threshold "
                                   "twice");
                if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
                        xtables_error(PARAMETER_PROBLEM,
                                   "bad --psd-weight-threshold `%s'", optarg);
                psdinfo->weight_threshold = num;
                *flags |= IPT_PSD_OPT_CTRESH;
                break;

        /* PSD-delay-threshold */
        case '2':
                if (*flags & IPT_PSD_OPT_DTRESH)
                        xtables_error(PARAMETER_PROBLEM,
                                   "Can't specify --psd-delay-threshold twice");
                if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
                        xtables_error(PARAMETER_PROBLEM,
                                   "bad --psd-delay-threshold `%s'", optarg);
                psdinfo->delay_threshold = num;
                *flags |= IPT_PSD_OPT_DTRESH;
                break;

        /* PSD-lo-ports-weight */
        case '3':
                if (*flags & IPT_PSD_OPT_LPWEIGHT)
                        xtables_error(PARAMETER_PROBLEM,
                                   "Can't specify --psd-lo-ports-weight twice");
                if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
                        xtables_error(PARAMETER_PROBLEM,
                                   "bad --psd-lo-ports-weight `%s'", optarg);
                psdinfo->lo_ports_weight = num;
                *flags |= IPT_PSD_OPT_LPWEIGHT;
                break;

        /* PSD-hi-ports-weight */
        case '4':
                if (*flags & IPT_PSD_OPT_HPWEIGHT)
                        xtables_error(PARAMETER_PROBLEM,
                                   "Can't specify --psd-hi-ports-weight twice");
                if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
                        xtables_error(PARAMETER_PROBLEM,
                                   "bad --psd-hi-ports-weight `%s'", optarg);
                psdinfo->hi_ports_weight = num;
                *flags |= IPT_PSD_OPT_HPWEIGHT;
                break;

        default:
                return 0;
        }

        return 1;
}

/* Final check; nothing. */
static void psd_check(unsigned int flags)
{
        return;
}

/* Prints out the targinfo. */
static void
psd_print(const void *ip, const struct xt_entry_match *match,
          int numeric)
{
        const struct ipt_psd_info *psdinfo
                = (const struct ipt_psd_info *)match->data;

        printf("psd ");
        printf("weight-threshold: %u ", psdinfo->weight_threshold);
        printf("delay-threshold: %u ", psdinfo->delay_threshold);
        printf("lo-ports-weight: %u ", psdinfo->lo_ports_weight);
        printf("hi-ports-weight: %u ", psdinfo->hi_ports_weight);
}

/* Saves the union ipt_targinfo in parsable form to stdout. */
static void
psd_save(const void *ip, const struct xt_entry_match *match)
{
        const struct ipt_psd_info *psdinfo
                = (const struct ipt_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 struct xtables_match psd_tg_reg = {
        .name           = "psd",
        .version        = XTABLES_VERSION,
        .size           = XT_ALIGN(sizeof(struct ipt_psd_info)),
        .userspacesize  = XT_ALIGN(sizeof(struct ipt_psd_info)),
        .help           = psd_help,
        .init           = psd_init,
        .parse          = psd_parse,
        .final_check    = psd_check,
        .print          = psd_print,
        .save           = psd_save,
        .extra_opts     = psd_opts,
};

void _init(void)
{
        xtables_register_match(&psd_tg_reg);
}
1	/*
2	Shared library add-on to iptables to add PSD support
3
4	Copyright (C) 2000,2001 astaro AG
5
6	This file is distributed under the terms of the GNU General Public
7	License (GPL). Copies of the GPL can be obtained from:
8	ftp://prep.ai.mit.edu/pub/gnu/GPL
9
10	2000-05-04 Markus Hennig <hennig@astaro.de> : initial
11	2000-08-18 Dennis Koslowski <koslowski@astaro.de> : first release
12	2000-12-01 Dennis Koslowski <koslowski@astaro.de> : UDP scans detection added
13	2001-02-04 Jan Rekorajski <baggins@pld.org.pl> : converted from target to match
14	2003-03-02 Harald Welte <laforge@netfilter.org>: fix 'storage' bug
15	2008-06-25 Luiz Capitulino <lcapitulino@mandriva.com.br>: converted from
16	target to match again (target interface has been added back someway)
17	*/
18
19	#include <stdio.h>
20	#include <netdb.h>
21	#include <string.h>
22	#include <stdlib.h>
23	#include <syslog.h>
24	#include <getopt.h>
25	#include <iptables.h>
26	#include <linux/netfilter_ipv4/ip_tables.h>
27	#include <linux/netfilter_ipv4/ipt_psd.h>
28
29
30	/* Function which prints out usage message. */
31	static void
32	psd_help(void)
33	{
34	printf(
35	"psd options:\n"
36	" --psd-weight-threshold threshhold Portscan detection weight threshold\n\n"
37	" --psd-delay-threshold delay Portscan detection delay threshold\n\n"
38	" --psd-lo-ports-weight lo Privileged ports weight\n\n"
39	" --psd-hi-ports-weight hi High ports weight\n\n");
40	}
41
42	static struct option psd_opts[] = {
43	{ "psd-weight-threshold", 1, 0, '1' },
44	{ "psd-delay-threshold", 1, 0, '2' },
45	{ "psd-lo-ports-weight", 1, 0, '3' },
46	{ "psd-hi-ports-weight", 1, 0, '4' },
47	{ 0 }
48	};
49
50	/* Initialize the target. */
51	static void
52	psd_init(struct xt_entry_match *m)
53	{
54	struct ipt_psd_info psdinfo = (struct ipt_psd_info )m->data;
55
56	psdinfo->weight_threshold = SCAN_WEIGHT_THRESHOLD;
57	psdinfo->delay_threshold = SCAN_DELAY_THRESHOLD;
58	psdinfo->lo_ports_weight = PORT_WEIGHT_PRIV;
59	psdinfo->hi_ports_weight = PORT_WEIGHT_HIGH;
60	}
61
62
63	typedef struct _code {
64	char *c_name;
65	int c_val;
66	} CODE;
67
68
69
70	#define IPT_PSD_OPT_CTRESH 0x01
71	#define IPT_PSD_OPT_DTRESH 0x02
72	#define IPT_PSD_OPT_LPWEIGHT 0x04
73	#define IPT_PSD_OPT_HPWEIGHT 0x08
74
75	/* Function which parses command options; returns true if it
76	ate an option */
77	static int
78	psd_parse(int c, char *argv, int invert, unsigned int flags,
79	const void entry, struct xt_entry_match *match)
80	{
81	struct ipt_psd_info psdinfo = (struct ipt_psd_info )(*match)->data;
82	unsigned int num;
83
84	switch (c) {
85	/* PSD-weight-threshold */
86	case '1':
87	if (*flags & IPT_PSD_OPT_CTRESH)
88	xtables_error(PARAMETER_PROBLEM,
89	"Can't specify --psd-weight-threshold "
90	"twice");
91	if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
92	xtables_error(PARAMETER_PROBLEM,
93	"bad --psd-weight-threshold `%s'", optarg);
94	psdinfo->weight_threshold = num;
95	*flags \|= IPT_PSD_OPT_CTRESH;
96	break;
97
98	/* PSD-delay-threshold */
99	case '2':
100	if (*flags & IPT_PSD_OPT_DTRESH)
101	xtables_error(PARAMETER_PROBLEM,
102	"Can't specify --psd-delay-threshold twice");
103	if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
104	xtables_error(PARAMETER_PROBLEM,
105	"bad --psd-delay-threshold `%s'", optarg);
106	psdinfo->delay_threshold = num;
107	*flags \|= IPT_PSD_OPT_DTRESH;
108	break;
109
110	/* PSD-lo-ports-weight */
111	case '3':
112	if (*flags & IPT_PSD_OPT_LPWEIGHT)
113	xtables_error(PARAMETER_PROBLEM,
114	"Can't specify --psd-lo-ports-weight twice");
115	if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
116	xtables_error(PARAMETER_PROBLEM,
117	"bad --psd-lo-ports-weight `%s'", optarg);
118	psdinfo->lo_ports_weight = num;
119	*flags \|= IPT_PSD_OPT_LPWEIGHT;
120	break;
121
122	/* PSD-hi-ports-weight */
123	case '4':
124	if (*flags & IPT_PSD_OPT_HPWEIGHT)
125	xtables_error(PARAMETER_PROBLEM,
126	"Can't specify --psd-hi-ports-weight twice");
127	if (xtables_strtoui(optarg, NULL, &num, 0, 10000) == -1)
128	xtables_error(PARAMETER_PROBLEM,
129	"bad --psd-hi-ports-weight `%s'", optarg);
130	psdinfo->hi_ports_weight = num;
131	*flags \|= IPT_PSD_OPT_HPWEIGHT;
132	break;
133
134	default:
135	return 0;
136	}
137
138	return 1;
139	}
140
141	/* Final check; nothing. */
142	static void psd_check(unsigned int flags)
143	{
144	return;
145	}
146
147	/* Prints out the targinfo. */
148	static void
149	psd_print(const void ip, const struct xt_entry_match match,
150	int numeric)
151	{
152	const struct ipt_psd_info *psdinfo
153	= (const struct ipt_psd_info *)match->data;
154
155	printf("psd ");
156	printf("weight-threshold: %u ", psdinfo->weight_threshold);
157	printf("delay-threshold: %u ", psdinfo->delay_threshold);
158	printf("lo-ports-weight: %u ", psdinfo->lo_ports_weight);
159	printf("hi-ports-weight: %u ", psdinfo->hi_ports_weight);
160	}
161
162	/* Saves the union ipt_targinfo in parsable form to stdout. */
163	static void
164	psd_save(const void ip, const struct xt_entry_match match)
165	{
166	const struct ipt_psd_info *psdinfo
167	= (const struct ipt_psd_info *)match->data;
168
169	printf("--psd-weight-threshold %u ", psdinfo->weight_threshold);
170	printf("--psd-delay-threshold %u ", psdinfo->delay_threshold);
171	printf("--psd-lo-ports-weight %u ", psdinfo->lo_ports_weight);
172	printf("--psd-hi-ports-weight %u ", psdinfo->hi_ports_weight);
173	}
174
175	static struct xtables_match psd_tg_reg = {
176	.name = "psd",
177	.version = XTABLES_VERSION,
178	.size = XT_ALIGN(sizeof(struct ipt_psd_info)),
179	.userspacesize = XT_ALIGN(sizeof(struct ipt_psd_info)),
180	.help = psd_help,
181	.init = psd_init,
182	.parse = psd_parse,
183	.final_check = psd_check,
184	.print = psd_print,
185	.save = psd_save,
186	.extra_opts = psd_opts,
187	};
188
189	void _init(void)
190	{
191	xtables_register_match(&psd_tg_reg);
192	}