+++ /dev/null
-Index: iptables-1.4.0/extensions/.CHAOS-testx
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/.CHAOS-testx
-@@ -0,0 +1,3 @@
-+#! /bin/sh
-+
-+[ -f "$KERNEL_DIR/include/linux/netfilter/xt_CHAOS.h" ] && echo "CHAOS"
-Index: iptables-1.4.0/extensions/libxt_CHAOS.c
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_CHAOS.c
-@@ -0,0 +1,114 @@
-+/*
-+ * CHAOS target for iptables
-+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007
-+ * Contact: Jan Engelhardt <jengelh@computergmbh.de>
-+ *
-+ * 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 or 3 as published by the Free Software Foundation.
-+ */
-+#include <getopt.h>
-+#include <stdbool.h>
-+#include <stdio.h>
-+#include <string.h>
-+
-+#include <xtables.h>
-+#include <linux/netfilter/x_tables.h>
-+#include <linux/netfilter/xt_CHAOS.h>
-+
-+enum {
-+ F_DELUDE = 1 << 0,
-+ F_TARPIT = 1 << 1,
-+};
-+
-+static const struct option chaos_tg_opts[] = {
-+ {.name = "delude", .has_arg = false, .val = 'd'},
-+ {.name = "tarpit", .has_arg = false, .val = 't'},
-+ {},
-+};
-+
-+static void chaos_tg_help(void)
-+{
-+ printf(
-+ "CHAOS target v%s options:\n"
-+ " --delude Enable DELUDE processing for TCP\n"
-+ " --tarpit Enable TARPIT processing for TCP\n",
-+ XTABLES_VERSION);
-+ return;
-+}
-+
-+static int chaos_tg_parse(int c, char **argv, int invert, unsigned int *flags,
-+ const void *entry, struct xt_entry_target **target)
-+{
-+ struct xt_chaos_target_info *info = (void *)((*target)->data);
-+ switch (c) {
-+ case 'd':
-+ info->variant = XTCHAOS_DELUDE;
-+ *flags |= F_DELUDE;
-+ return true;
-+ case 't':
-+ info->variant = XTCHAOS_TARPIT;
-+ *flags |= F_TARPIT;
-+ return true;
-+ }
-+ return false;
-+}
-+
-+static void chaos_tg_check(unsigned int flags)
-+{
-+ if ((flags & (F_DELUDE | F_TARPIT)) == (F_DELUDE | F_TARPIT))
-+ /* If flags == 0x03, both were specified, which should not be. */
-+ exit_error(PARAMETER_PROBLEM,
-+ "CHAOS: only one of --tarpit or --delude "
-+ "may be specified");
-+ return;
-+}
-+
-+static void chaos_tg_print(const void *ip,
-+ const struct xt_entry_target *target, int numeric)
-+{
-+ const struct xt_chaos_target_info *info = (const void *)target->data;
-+ switch (info->variant) {
-+ case XTCHAOS_DELUDE:
-+ printf("DELUDE ");
-+ break;
-+ case XTCHAOS_TARPIT:
-+ printf("TARPIT ");
-+ break;
-+ }
-+ return;
-+}
-+
-+static void chaos_tg_save(const void *ip, const struct xt_entry_target *target)
-+{
-+ const struct xt_chaos_target_info *info = (const void *)target->data;
-+ switch (info->variant) {
-+ case XTCHAOS_DELUDE:
-+ printf("--delude ");
-+ break;
-+ case XTCHAOS_TARPIT:
-+ printf("--tarpit ");
-+ break;
-+ }
-+ return;
-+}
-+
-+static struct xtables_target chaos_tg_reg = {
-+ .version = XTABLES_VERSION,
-+ .name = "CHAOS",
-+ .family = AF_INET,
-+ .size = XT_ALIGN(sizeof(struct xt_chaos_target_info)),
-+ .userspacesize = XT_ALIGN(sizeof(struct xt_chaos_target_info)),
-+ .help = chaos_tg_help,
-+ .parse = chaos_tg_parse,
-+ .final_check = chaos_tg_check,
-+ .print = chaos_tg_print,
-+ .save = chaos_tg_save,
-+ .extra_opts = chaos_tg_opts,
-+};
-+
-+void _init(void)
-+{
-+ xtables_register_target(&chaos_tg_reg);
-+ return;
-+}
-Index: iptables-1.4.0/extensions/libxt_CHAOS.man
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_CHAOS.man
-@@ -0,0 +1,18 @@
-+Causes confusion on the other end by doing odd things with incoming packets.
-+CHAOS will randomly reply (or not) with one of its configurable subtargets:
-+.TP
-+\fB--delude\fR
-+Use the REJECT and DELUDE targets as a base to do a sudden or deferred
-+connection reset, fooling some network scanners to return non-deterministic
-+(randomly open/closed) results, and in case it is deemed open, it is actually
-+closed/filtered.
-+.TP
-+\fB--tarpit\fR
-+Use the REJECT and TARPIT target as a base to hold the connection until it
-+times out. This consumes conntrack entries when connection tracking is loaded
-+(which usually is on most machines), and routers inbetween you and the Internet
-+may fail to do their connection tracking if they have to handle more
-+connections than they can.
-+.PP
-+The randomness factor of not replying vs. replying can be set during load-time
-+of the xt_CHAOS module or during runtime in /sys/modules/xt_CHAOS/parameters.
-Index: iptables-1.4.0/extensions/.DELUDE-testx
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/.DELUDE-testx
-@@ -0,0 +1,3 @@
-+#! /bin/sh
-+
-+[ -f "$KERNEL_DIR/net/netfilter/xt_DELUDE.c" ] && echo "DELUDE"
-Index: iptables-1.4.0/extensions/libxt_DELUDE.c
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_DELUDE.c
-@@ -0,0 +1,49 @@
-+/*
-+ * DELUDE target for iptables
-+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007
-+ * Contact: Jan Engelhardt <jengelh@computergmbh.de>
-+ *
-+ * 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 or 3 as published by the Free Software Foundation.
-+ */
-+#include <getopt.h>
-+#include <stdio.h>
-+#include <string.h>
-+
-+#include <xtables.h>
-+#include <linux/netfilter/x_tables.h>
-+
-+static void delude_tg_help(void)
-+{
-+ printf("DELUDE takes no options\n");
-+ return;
-+}
-+
-+static int delude_tg_parse(int c, char **argv, int invert, unsigned int *flags,
-+ const void *entry, struct xt_entry_target **target)
-+{
-+ return 0;
-+}
-+
-+static void delude_tg_check(unsigned int flags)
-+{
-+ return;
-+}
-+
-+static struct xtables_target delude_tg_reg = {
-+ .version = XTABLES_VERSION,
-+ .name = "DELUDE",
-+ .family = AF_INET,
-+ .size = XT_ALIGN(0),
-+ .userspacesize = XT_ALIGN(0),
-+ .help = delude_tg_help,
-+ .parse = delude_tg_parse,
-+ .final_check = delude_tg_check,
-+};
-+
-+void _init(void)
-+{
-+ xtables_register_target(&delude_tg_reg);
-+ return;
-+}
-Index: iptables-1.4.0/extensions/libxt_DELUDE.man
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_DELUDE.man
-@@ -0,0 +1,4 @@
-+The DELUDE target will reply to a SYN packet with SYN-ACK, and to all other
-+packets with an RST. This will terminate the connection much like REJECT, but
-+network scanners doing TCP half-open discovery can be spoofed to make them
-+belive the port is open rather than closed/filtered.
-Index: iptables-1.4.0/extensions/.portscan-testx
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/.portscan-testx
-@@ -0,0 +1,3 @@
-+#! /bin/sh
-+
-+[ -f "$KERNEL_DIR/include/linux/netfilter/xt_portscan.h" ] && echo "portscan"
-Index: iptables-1.4.0/extensions/libxt_portscan.c
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_portscan.c
-@@ -0,0 +1,127 @@
-+/*
-+ * portscan match for iptables
-+ * Copyright © CC Computer Consultants GmbH, 2006 - 2007
-+ * Contact: Jan Engelhardt <jengelh@computergmbh.de>
-+ *
-+ * 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 or 3 as published by the Free Software Foundation.
-+ */
-+#include <stdbool.h>
-+#include <stdio.h>
-+#include <string.h>
-+#include <stdlib.h>
-+#include <getopt.h>
-+
-+#include <xtables.h>
-+#include <iptables.h>
-+#include <linux/netfilter/x_tables.h>
-+#include <linux/netfilter/xt_portscan.h>
-+
-+static const struct option portscan_mt_opts[] = {
-+ {.name = "stealth", .has_arg = false, .val = 'x'},
-+ {.name = "synscan", .has_arg = false, .val = 's'},
-+ {.name = "cnscan", .has_arg = false, .val = 'c'},
-+ {.name = "grscan", .has_arg = false, .val = 'g'},
-+ {},
-+};
-+
-+static void portscan_mt_help(void)
-+{
-+ printf(
-+ "portscan match v%s options:\n"
-+ "(Combining them will make them match by OR-logic)\n"
-+ " --stealth Match TCP Stealth packets\n"
-+ " --synscan Match TCP SYN scans\n"
-+ " --cnscan Match TCP Connect scans\n"
-+ " --grscan Match Banner Grabbing scans\n",
-+ XTABLES_VERSION);
-+ return;
-+}
-+
-+static int portscan_mt_parse(int c, char **argv, int invert,
-+ unsigned int *flags, const void *entry, struct xt_entry_match **match)
-+{
-+ struct xt_portscan_match_info *info = (void *)((*match)->data);
-+
-+ switch (c) {
-+ case 'c':
-+ info->match_cn = true;
-+ return true;
-+ case 'g':
-+ info->match_gr = true;
-+ return true;
-+ case 's':
-+ info->match_syn = true;
-+ return true;
-+ case 'x':
-+ info->match_stealth = true;
-+ return true;
-+ }
-+ return false;
-+}
-+
-+static void portscan_mt_check(unsigned int flags)
-+{
-+ return;
-+}
-+
-+static void portscan_mt_print(const void *ip,
-+ const struct xt_entry_match *match, int numeric)
-+{
-+ const struct xt_portscan_match_info *info = (const void *)(match->data);
-+ const char *s = "";
-+
-+ printf("portscan ");
-+ if (info->match_stealth) {
-+ printf("STEALTH");
-+ s = ",";
-+ }
-+ if (info->match_syn) {
-+ printf("%sSYNSCAN", s);
-+ s = ",";
-+ }
-+ if (info->match_cn) {
-+ printf("%sCNSCAN", s);
-+ s = ",";
-+ }
-+ if (info->match_gr)
-+ printf("%sGRSCAN", s);
-+ printf(" ");
-+ return;
-+}
-+
-+static void portscan_mt_save(const void *ip, const struct xt_entry_match *match)
-+{
-+ const struct xt_portscan_match_info *info = (const void *)(match->data);
-+
-+ if (info->match_stealth)
-+ printf("--stealth ");
-+ if (info->match_syn)
-+ printf("--synscan ");
-+ if (info->match_cn)
-+ printf("--cnscan ");
-+ if (info->match_gr)
-+ printf("--grscan ");
-+ return;
-+}
-+
-+static struct xtables_match portscan_mt_reg = {
-+ .version = XTABLES_VERSION,
-+ .name = "portscan",
-+ .family = AF_INET,
-+ .size = XT_ALIGN(sizeof(struct xt_portscan_match_info)),
-+ .userspacesize = XT_ALIGN(sizeof(struct xt_portscan_match_info)),
-+ .help = portscan_mt_help,
-+ .parse = portscan_mt_parse,
-+ .final_check = portscan_mt_check,
-+ .print = portscan_mt_print,
-+ .save = portscan_mt_save,
-+ .extra_opts = portscan_mt_opts,
-+};
-+
-+void _init(void)
-+{
-+ xtables_register_match(&portscan_mt_reg);
-+ return;
-+}
-Index: iptables-1.4.0/extensions/libxt_portscan.man
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_portscan.man
-@@ -0,0 +1,27 @@
-+Detects simple port scan attemps based upon the packet's contents. (This is
-+different from other implementations, which also try to match the rate of new
-+connections.) Note that an attempt is only discovered after it has been carried
-+out, but this information can be used in conjunction with other rules to block
-+the remote host's future connections. So this match module will match on the
-+(probably) last packet the remote side will send to your machine.
-+.TP
-+\fB--stealth\fR
-+Match if the packet did not belong to any known TCP connection
-+(Stealth/FIN/XMAS/NULL scan).
-+.TP
-+\fB--synscan\fR
-+Match if the connection was a TCP half-open discovery (SYN scan), i.e. the
-+connection was torn down after the 2nd packet in the 3-way handshake.
-+.TP
-+\fB--cnscan\fR
-+Match if the connection was a TCP full open discovery (connect scan), i.e. the
-+connection was torn down after completion of the 3-way handshake.
-+.TP
-+\fB--grscan\fR
-+Match if data in the connection only flew in the direction of the remote side,
-+e.g. if the connection was terminated after a locally running daemon sent its
-+identification. (e.g. openssh)
-+.PP
-+NOTE: Some clients (Windows XP for example) may do what looks like a SYN scan,
-+so be advised to carefully use xt_portscan in conjunction with blocking rules,
-+as it may lock out your very own internal network.
+++ /dev/null
-Index: iptables-1.4.0/extensions/libxt_TARPIT.c
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_TARPIT.c
-@@ -0,0 +1,55 @@
-+/* Shared library add-on to iptables to add TARPIT target support */
-+#include <stdio.h>
-+#include <getopt.h>
-+
-+#include <xtables.h>
-+#include <linux/netfilter/x_tables.h>
-+
-+static void TARPIT_help(void)
-+{
-+ fputs(
-+"TARPIT takes no options\n"
-+"\n", stdout);
-+}
-+
-+static struct option TARPIT_opts[] = {
-+ { 0 }
-+};
-+
-+static int TARPIT_parse(int c, char **argv, int invert, unsigned int *flags,
-+ const void *entry, struct xt_entry_target **target)
-+{
-+ return 0;
-+}
-+
-+static void TARPIT_final_check(unsigned int flags)
-+{
-+}
-+
-+static void TARPIT_print(const void *ip, const struct xt_entry_target *target,
-+ int numeric)
-+{
-+}
-+
-+static void TARPIT_save(const void *ip, const struct xt_entry_target *target)
-+{
-+}
-+
-+static struct xtables_target tarpit_target = {
-+ .family = AF_INET,
-+ .name = "TARPIT",
-+ .version = XTABLES_VERSION,
-+ .size = XT_ALIGN(0),
-+ .userspacesize = XT_ALIGN(0),
-+ .help = TARPIT_help,
-+ .parse = TARPIT_parse,
-+ .final_check = TARPIT_final_check,
-+ .print = TARPIT_print,
-+ .save = TARPIT_save,
-+ .extra_opts = TARPIT_opts
-+};
-+
-+void _init(void)
-+{
-+ xtables_register_target(&tarpit_target);
-+}
-Index: iptables-1.4.0/extensions/libxt_TARPIT.man
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/libxt_TARPIT.man
-@@ -0,0 +1,34 @@
-+Captures and holds incoming TCP connections using no local
-+per-connection resources. Connections are accepted, but immediately
-+switched to the persist state (0 byte window), in which the remote
-+side stops sending data and asks to continue every 60-240 seconds.
-+Attempts to close the connection are ignored, forcing the remote side
-+to time out the connection in 12-24 minutes.
-+
-+This offers similar functionality to LaBrea
-+<http://www.hackbusters.net/LaBrea/> but doesn't require dedicated
-+hardware or IPs. Any TCP port that you would normally DROP or REJECT
-+can instead become a tarpit.
-+
-+To tarpit connections to TCP port 80 destined for the current machine:
-+.IP
-+iptables -A INPUT -p tcp -m tcp --dport 80 -j TARPIT
-+.P
-+To significantly slow down Code Red/Nimda-style scans of unused address
-+space, forward unused ip addresses to a Linux box not acting as a router
-+(e.g. "ip route 10.0.0.0 255.0.0.0 ip.of.linux.box" on a Cisco), enable IP
-+forwarding on the Linux box, and add:
-+.IP
-+iptables -A FORWARD -p tcp -j TARPIT
-+.IP
-+iptables -A FORWARD -j DROP
-+.TP
-+NOTE:
-+If you use the conntrack module while you are using TARPIT, you should
-+also use the NOTRACK target, or the kernel will unnecessarily allocate
-+resources for each TARPITted connection. To TARPIT incoming
-+connections to the standard IRC port while using conntrack, you could:
-+.IP
-+iptables -t raw -A PREROUTING -p tcp --dport 6667 -j NOTRACK
-+.IP
-+iptables -A INPUT -p tcp --dport 6667 -j TARPIT
-Index: iptables-1.4.0/extensions/.TARPIT-testx
-===================================================================
---- /dev/null
-+++ iptables-1.4.0/extensions/.TARPIT-testx
-@@ -0,0 +1,2 @@
-+#! /bin/sh
-+[ -f "$KERNEL_DIR/net/netfilter/xt_TARPIT.c" ] && echo "TARPIT"
projects / openwrt.git / commitdiff