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107 lines
3.5 KiB
Diff
107 lines
3.5 KiB
Diff
diff -N -u -r iptables-1.3.8-20070817/extensions/libipt_TARPIT.c iptables-1.3.8-20070817-nf/extensions/libipt_TARPIT.c
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--- iptables-1.3.8-20070817/extensions/libipt_TARPIT.c 1969-12-31 19:00:00.000000000 -0500
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+++ iptables-1.3.8-20070817-nf/extensions/libipt_TARPIT.c 2007-08-18 14:49:25.000000000 -0400
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@@ -0,0 +1,58 @@
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+/* Shared library add-on to iptables for TARPIT support */
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+#include <stdio.h>
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+#include <getopt.h>
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+#include <iptables.h>
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+
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+static void
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+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 opts[] = {
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+ { 0 }
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+};
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+
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+static int
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+parse(int c, char **argv, int invert, unsigned int *flags,
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+ const struct ipt_entry *entry,
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+ struct ipt_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 final_check(unsigned int flags)
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+{
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+}
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+
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+static void
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+print(const struct ipt_ip *ip,
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+ const struct ipt_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 save(const struct ipt_ip *ip, const struct ipt_entry_target *target)
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+{
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+}
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+
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+static struct iptables_target tarpit = {
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+ .next = NULL,
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+ .name = "TARPIT",
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+ .version = IPTABLES_VERSION,
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+ .size = IPT_ALIGN(0),
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+ .userspacesize = IPT_ALIGN(0),
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+ .help = &help,
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+ .parse = &parse,
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+ .final_check = &final_check,
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+ .print = &print,
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+ .save = &save,
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+ .extra_opts = opts
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+};
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+
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+void _init(void)
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+{
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+ register_target(&tarpit);
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+}
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diff -N -u -r iptables-1.3.8-20070817/extensions/libipt_TARPIT.man iptables-1.3.8-20070817-nf/extensions/libipt_TARPIT.man
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--- iptables-1.3.8-20070817/extensions/libipt_TARPIT.man 1969-12-31 19:00:00.000000000 -0500
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+++ iptables-1.3.8-20070817-nf/extensions/libipt_TARPIT.man 2007-08-18 14:49:25.000000000 -0400
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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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diff -N -u -r iptables-1.3.8-20070817/extensions/.TARPIT-test iptables-1.3.8-20070817-nf/extensions/.TARPIT-test
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--- iptables-1.3.8-20070817/extensions/.TARPIT-test 1969-12-31 19:00:00.000000000 -0500
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+++ iptables-1.3.8-20070817-nf/extensions/.TARPIT-test 2007-08-18 14:49:25.000000000 -0400
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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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