mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-29 00:05:54 +02:00
a58eaf210a
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@10843 3c298f89-4303-0410-b956-a3cf2f4a3e73
107 lines
3.2 KiB
Diff
107 lines
3.2 KiB
Diff
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 = IPTABLES_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"
|