mirror of
https://github.com/openwrt/openwrt.git
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107 lines
3.2 KiB
Diff
107 lines
3.2 KiB
Diff
Index: iptables-1.4.0/extensions/libxt_TARPIT.c
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===================================================================
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--- /dev/null
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+++ iptables-1.4.0/extensions/libxt_TARPIT.c
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@@ -0,0 +1,55 @@
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+/* Shared library add-on to iptables to add TARPIT target support */
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+#include <stdio.h>
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+#include <getopt.h>
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+
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+#include <xtables.h>
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+#include <linux/netfilter/x_tables.h>
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+
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+static void TARPIT_help(void)
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+{
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+ fputs(
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+"TARPIT takes no options\n"
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+"\n", stdout);
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+}
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+
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+static struct option TARPIT_opts[] = {
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+ { 0 }
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+};
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+
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+static int TARPIT_parse(int c, char **argv, int invert, unsigned int *flags,
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+ const void *entry, struct xt_entry_target **target)
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+{
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+ return 0;
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+}
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+
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+static void TARPIT_final_check(unsigned int flags)
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+{
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+}
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+
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+static void TARPIT_print(const void *ip, const struct xt_entry_target *target,
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+ int numeric)
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+{
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+}
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+
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+static void TARPIT_save(const void *ip, const struct xt_entry_target *target)
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+{
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+}
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+
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+static struct xtables_target tarpit_target = {
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+ .family = AF_INET,
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+ .name = "TARPIT",
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+ .version = IPTABLES_VERSION,
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+ .size = XT_ALIGN(0),
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+ .userspacesize = XT_ALIGN(0),
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+ .help = TARPIT_help,
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+ .parse = TARPIT_parse,
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+ .final_check = TARPIT_final_check,
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+ .print = TARPIT_print,
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+ .save = TARPIT_save,
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+ .extra_opts = TARPIT_opts
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+};
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+
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+void _init(void)
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+{
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+ xtables_register_target(&tarpit_target);
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+}
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Index: iptables-1.4.0/extensions/libxt_TARPIT.man
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===================================================================
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--- /dev/null
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+++ iptables-1.4.0/extensions/libxt_TARPIT.man
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@@ -0,0 +1,34 @@
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+Captures and holds incoming TCP connections using no local
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+per-connection resources. Connections are accepted, but immediately
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+switched to the persist state (0 byte window), in which the remote
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+side stops sending data and asks to continue every 60-240 seconds.
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+Attempts to close the connection are ignored, forcing the remote side
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+to time out the connection in 12-24 minutes.
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+
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+This offers similar functionality to LaBrea
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+<http://www.hackbusters.net/LaBrea/> but doesn't require dedicated
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+hardware or IPs. Any TCP port that you would normally DROP or REJECT
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+can instead become a tarpit.
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+
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+To tarpit connections to TCP port 80 destined for the current machine:
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+.IP
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+iptables -A INPUT -p tcp -m tcp --dport 80 -j TARPIT
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+.P
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+To significantly slow down Code Red/Nimda-style scans of unused address
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+space, forward unused ip addresses to a Linux box not acting as a router
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+(e.g. "ip route 10.0.0.0 255.0.0.0 ip.of.linux.box" on a Cisco), enable IP
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+forwarding on the Linux box, and add:
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+.IP
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+iptables -A FORWARD -p tcp -j TARPIT
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+.IP
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+iptables -A FORWARD -j DROP
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+.TP
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+NOTE:
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+If you use the conntrack module while you are using TARPIT, you should
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+also use the NOTRACK target, or the kernel will unnecessarily allocate
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+resources for each TARPITted connection. To TARPIT incoming
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+connections to the standard IRC port while using conntrack, you could:
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+.IP
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+iptables -t raw -A PREROUTING -p tcp --dport 6667 -j NOTRACK
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+.IP
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+iptables -A INPUT -p tcp --dport 6667 -j TARPIT
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Index: iptables-1.4.0/extensions/.TARPIT-testx
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===================================================================
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--- /dev/null
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+++ iptables-1.4.0/extensions/.TARPIT-testx
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@@ -0,0 +1,2 @@
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+#! /bin/sh
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+[ -f "$KERNEL_DIR/net/netfilter/xt_TARPIT.c" ] && echo "TARPIT"
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