SECURITE RESEAU HACKING DECRYPTAGE ENTREPRISE ATTAQUE

spoofscan.c

/*
 * $Id: spoofscan.c,v 0.9 2004/03/06 17:29:17 sviat Exp $
 * <spoofed stealth portscanner>
 *
 * Copyright (c) 2002 Luigi Pizzirani <l.pizzira@virgilio.it>
 *
 * 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.
 *
 *
 */

#include           <sys/types.h>
#include           <sys/socket.h>
#include           <netinet/in.h>
#include           <netinet/in_systm.h>

#ifndef __USE_BSD
#define             __USE_BSD
#endif

#include           <netinet/ip.h>

#ifndef __FAVOR_BSD
#define             __FAVOR_BSD
#endif

#include           <netinet/tcp.h>
#include           <netinet/ip_icmp.h>
#include           <arpa/inet.h>
#include           <netdb.h>
#include           <stdio.h>
#include           <stdlib.h>
#include           <string.h>
#include           <unistd.h>

#define             MAXNUMPORTS     65535

/* pseudotcp structure to calculate tcp checksum as specified in RFC 793 */
struct pseudo {
            uint32_t saddr;
            uint32_t daddr;
            char unused;
            char proto;
            uint16_t length;
};

char packet[256], packet2[256], packet3[256], buf[256];
struct ip *ip = (struct ip *) packet;
struct tcphdr *tcp = (struct tcphdr *) (packet + sizeof(struct ip));
struct pseudo *pseudo = (struct pseudo *) packet3;
struct ip *ip2 = (struct ip *) packet2;
struct icmp *icmp = (struct icmp *) (packet2 + sizeof(struct ip));
char *data = packet + sizeof(struct ip) + sizeof(struct tcphdr);
char *data2 = packet2 + sizeof(struct ip) + sizeof(struct icmp);
struct ip *iprecv = (struct ip *) buf;

void                 usage(char *);
void                 print_service(uint16_t);
uint16_t           checksum(uint16_t*, int);
uint16_t           send_icmp(int, int, struct ip*, struct sockaddr_in, struct sockaddr_in);
void                 send_tcp(int, struct ip*, struct sockaddr_in, struct sockaddr_in, int);
int                    check_traffic(int, int, struct sockaddr_in, struct sockaddr_in, int, char*);

int
main(int argc, char **argv)
{
            int s, s2, s3, ch, open_ports[MAXNUMPORTS];
            register int i, j, h, k;
            uint16_t id[100], a[100], b[100];
            int on = 1;
            int *p = open_ports;
            register int t = 0;          
            const int *optval = &on;
            char *target_host, *silent_host, *low_port, *high_port, *num_packets, *timeout;
            struct hostent *hostent, *hostent2;
            struct sockaddr_in sin, sin2, sin3;

             /* Security */

        if (getuid() != geteuid()) {
                puts("Stealth Scan doesn't run with +s bit set.");
                        exit(1);
            }

            if (getuid() != 0) {
                puts("Stealth Scan must run as root.");
                        exit(1);
            }         
           
            puts("\nStealth Scan by Luigi Pizzirani.\n");
            puts("Warning!!! This is a stealth portscanner based on the requirements that the host we are using for our spoof");
            puts("has no traffic, has not random IP id and we have all firewalls down. Anyway, being this scanner stealth, it");
            puts("is far from being 100% reliable. Enjoy it.\n");
            puts("DISCLAIMER!!! IP SPOOFING, AS ANY KIND OF FORGEMENT IS AN ILLEGAL PRACTICE. USE");
            puts("THIS SCANNER ONLY FOR TESTING PURPOSES AND ON YOUR LOCAL AREA NETWORK. IN NO EVENT");
            puts("I CONSIDER MYSELF LIABLE FOR ANY ABUSE OF THIS PROGRAM.\n");

            if (argc != 13)
                        usage(argv[0]);

            while ( (ch = getopt(argc, argv, "a:s:l:h:n:t:")) != -1)
                switch(ch) {
                case 'a':
                        target_host = argv[optind - 1];
                        break; 

                case 's':
                        silent_host = argv[optind - 1];
                                   break;
                case 'l':
                        low_port = argv[optind - 1];
                                   break;
                case 'h':
                        high_port = argv[optind - 1];
                                   break;
                        case 'n':
                                   num_packets = argv[optind - 1];
                                   if (atoi(num_packets) > 100) {
                                               puts("You cannot send more than 100 packets.\n");
                                               exit(1);
                                   }
                                   break;
                case 't':
                        timeout = argv[optind - 1];
                                   break;
                case '?':
                default:
                       usage(argv[0]);
                                       
                }

            *p = 0;

            if ( (s = socket(PF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
                perror("socket");
                exit(1);
        }

        if ( (s2 = socket(PF_INET, SOCK_RAW, IPPROTO_RAW)) < 0) {
                perror("socket");
                exit(1);
        }

             if ( (s3 = socket(PF_INET, SOCK_RAW, IPPROTO_ICMP)) < 0) {
                perror("socket");
                exit(1);
        }

            setsockopt(s, IPPROTO_IP, IP_HDRINCL, optval, sizeof(on));
            setsockopt(s2, IPPROTO_IP, IP_HDRINCL, optval, sizeof(on));

            memset(&sin, 0, sizeof(sin));
            memset(&sin2, 0, sizeof(sin));
            memset(&sin3, 0, sizeof(sin));

            memset(ip, 0, sizeof(struct ip));
            memset(ip2, 0, sizeof(struct ip));

            memset(icmp, 0, sizeof(struct icmp));

            memset(iprecv, 0, sizeof(struct ip));

            sin.sin_family = sin2.sin_family = sin3.sin_family = AF_INET;

             /* target host's ip address */
        if ( (hostent = gethostbyname(target_host)))
                memcpy (&sin.sin_addr, hostent->h_addr, hostent->h_length);
        else if ( (inet_pton(AF_INET, target_host, &sin.sin_addr)) != INADDR_NONE) {
                herror("gethostbyname"); 
                exit(1);
        }

        /* silent host's ip address */
        if ( (hostent2 = gethostbyname(silent_host)))
                memcpy (&sin2.sin_addr, hostent2->h_addr, hostent2->h_length);
        else if ( (inet_pton(AF_INET, silent_host, &sin2.sin_addr)) != INADDR_NONE) {
                herror("gethostbyname");
                exit(1);
            }

            sin3.sin_addr.s_addr = htonl(INADDR_ANY);  /*my own ip address */

            if (check_traffic(s2, s3, sin3, sin2, atoi(num_packets), silent_host))
                        exit(1);

            /* sends icmp packets to the dumb host and tcp packets with SYN flag set to the target host */
            for (i = atoi(low_port); i <= atoi(high_port); i++) {
                        usleep(atoi(timeout));

                        printf("Id sequence relative to port %d of host %s via %s:\t\t", i, target_host, silent_host);

                        tcp->th_dport = sin.sin_port = sin2.sin_port = (uint16_t) i;

                        for (j = 0; j < atoi(num_packets); j++) {
                                   icmp->icmp_seq = htons((uint16_t) j);
                                   id[j] = send_icmp(s2, s3 , ip2, sin3, sin2);
                                   send_tcp(s, ip,  sin2, sin, i);
                                   printf("%d\t", id[j]);
                        }
                       
                        k = 1;
                       
                        for (j = 0; j < atoi(num_packets) - 1; j++)
                    a[j] = id[j + 1] - id[j];

                        for (j = 0; j < atoi(num_packets) - 2; j++) {
                                   b[j] = (a[j + 1] == a[j]);
                                   k = (k && b[j]);
                        }
           
            /* if id field increases constantly and the silent host has still no traffic the port must be closed, otherwise it must be open */

                        for (j = 0; j < atoi(num_packets) - 1; j++ )
                                   if (!id[j]) {
                                   puts("\nId field must not be 0. Please try another host.\n");
                                               return 1;
                        }

               if (!k) {
                                   usleep(atoi(timeout));

                                   for (h = 0; h < atoi(num_packets); h++)
                                   id[h] = send_icmp(s2, s3, ip2, sin3, sin2);

                                   k = 1;
                                              
                                   for (j = 0; j < atoi(num_packets) - 1; j++)
                                   a[j] = id[j + 1] - id[j];

                                   for (j = 0; j < atoi(num_packets) - 2; j++) {
                                          b[j] = (a[j + 1] == a[j]);
                               k = (k && b[j]);
                                   }

                                   if (k) {
                                               printf("\aHmmm...looks like %d is OPEN.\n", i);
                                               open_ports[t++] = i;
                                   }
                                   else {
                                               printf("\nHost %s now has too much traffic. Please change it or retry later.Stop at port %d.\n", silent_host, i);
                                               printf("\nPorts of %s that look like open:\t", target_host);
                                               while (*p)
                                               print_service((uint16_t) *p++);
                                               puts("\b\b.");
                                    exit(1);
                                   }
                        }
                        else
                                   printf("Hmmm...looks like %d is closed.\n", i);
            }
           
            printf("\nPorts of %s that look like open:\t", target_host);

            while (*p)
                        print_service((uint16_t) *p++);
           
            puts("\b\b.");

            close(s);
            close(s2);
            close(s3);

            exit(0);
}         

void
usage(char *how)
{
        printf("Usage: %s -a target_host -s silent_host -l low_port -h high_port -n num_packets -t timeout(in microseconds).\n", how);
        exit(1);
}

void
print_service(uint16_t port)
{
        struct servent *servent;

        if ( (servent = getservbyport(htons(port), "tcp")))
                printf("%d(%s), ", port, servent->s_name);
        else
                printf("%d, ", port);
}

        /* usual checksum */
uint16_t
checksum(uint16_t *addr, int len)
{
        register int sum = 0;
        uint16_t answer = 0;
        register uint16_t *w = addr;
        register int nleft = len;
        while (nleft > 1) {
                sum += *w++;
                nleft -= 2;
        }

        if (nleft == 1) {
                *(uint16_t *) (&answer) = *(uint16_t *) w;
                sum += answer;
        }

        /* add back carry outs from top 16 bits to low 16 bits */
        sum = (sum >> 16) + (sum & 0xffff); /* add hi 16 to low 16 */
        sum += (sum >> 16); /* add carry */
        answer = ~sum; /* truncate to 16 bits */
        return (answer);
}

/* sends icmp packets to silent host */
uint16_t
send_icmp(int sendsock, int recvsock, struct ip *ip, struct sockaddr_in mysin, struct sockaddr_in dumbsin)
{
        int size = sizeof(struct sockaddr_in);
        register int i;
        uint16_t id;

        ip->ip_hl = 5;
        ip->ip_v = 4;
        ip->ip_tos = 0;
        ip->ip_len = sizeof(struct ip) + sizeof(struct icmp) + 48;
        ip->ip_id = htons((uint16_t) random());
        ip->ip_off =  0;
        ip->ip_ttl = 255;
        ip->ip_p = IPPROTO_ICMP;
        ip->ip_sum = 0;
        ip->ip_src = mysin.sin_addr;
        ip->ip_dst = dumbsin.sin_addr;
 
        icmp->icmp_type = 8; /* echo request */
        icmp->icmp_code = 0;
        icmp->icmp_cksum = 0;
        icmp->icmp_id = htons((uint16_t) random()); /* thx awgn for having told me how to fill this field */
 
        /* thx again, man for this too */
        for (i = 0; i < 48; i++)
                data2[i] = i + 8;
       
        icmp->icmp_cksum = checksum((uint16_t *) icmp, (sizeof(struct icmp) + 48) & ~1);
               
        sendto(sendsock, packet2, ip->ip_len, 0, (struct sockaddr *) &dumbsin, size);
        recvfrom(recvsock, buf, sizeof(struct ip) + sizeof(struct icmp) + sizeof(data), 0, (struct sockaddr *) &dumbsin, &size);
        id = ntohs(iprecv->ip_id);
 
        return (id);
}

/* sends tcp spoofed packets to target host with silent's host source ip */
void
send_tcp(int sock, struct ip *ip, struct sockaddr_in dumbsin, struct sockaddr_in targetsin, int i)
{
        memset(pseudo, 0, sizeof(struct pseudo));

        ip->ip_hl = 5;
        ip->ip_v = 4;
        ip->ip_tos = 0;
        ip->ip_len = sizeof(struct ip) + sizeof(struct tcphdr);
        ip->ip_id = htons((uint16_t) random());
        ip->ip_off =  0;
        ip->ip_ttl = 255;
        ip->ip_p = IPPROTO_TCP;
        ip->ip_sum = 0;
        ip->ip_src = dumbsin.sin_addr;
        ip->ip_dst = targetsin.sin_addr;

        pseudo->saddr = ip->ip_src.s_addr;
        pseudo->daddr = ip->ip_dst.s_addr;
        pseudo->unused = 0;
        pseudo->proto = IPPROTO_TCP;
        pseudo->length = htons(sizeof(struct tcphdr));

        tcp->th_sport = htons(rand());
        tcp->th_dport = htons((uint16_t)i);
        tcp->th_seq = htonl(random());
        tcp->th_ack = 0;
        tcp->th_off = 5;
        tcp->th_flags = TH_SYN;
        tcp->th_win = htons(65535);
        tcp->th_sum = 0;
        tcp->th_urp =0;

        memcpy(packet3, pseudo, sizeof(struct pseudo));
        memcpy(packet3 + sizeof(struct pseudo), tcp, sizeof(struct tcphdr));
        memset(packet3 + sizeof(struct pseudo) + sizeof(struct tcphdr), 0, 12);

        tcp->th_sum = checksum((uint16_t *) packet3, (sizeof(struct pseudo) + sizeof(struct tcphdr) + 12) & ~1);

        sendto(sock, packet, ip->ip_len, 0, (struct sockaddr *) &targetsin, sizeof(struct sockaddr_in));
}

/* verifies if the silent host is really silent:) */
int
check_traffic(int sendsock, int recvsock, struct sockaddr_in mysin, struct sockaddr_in dumbsin, int npack, char* host)
{  
        int k;
        register int i;
        uint16_t id[100], a[100], b[100];
       
        printf("Id sequence relative to %s:\t\t", host);

        k = 1;
       
        for (i = 0; i < npack; i++) {
                icmp->icmp_seq = htons((uint16_t)i);
                id[i] = send_icmp(sendsock, recvsock, ip2, mysin, dumbsin);
                printf("%d\t", id[i]);
        }
       
        for (i = 0; i < npack - 1; i++)
                a[i] = id[i + 1] - id[i];

        for (i = 0; i < npack - 2; i++) {
                b[i] = (a[i + 1] == a[i]);
                k =  (k && b[i]);
        }

        if (!id[i]) {
                puts("\nId field must not be 0. Please try another host.\n");
                return (1);
        }

        if (k) {
                printf("\nIt seems that host %s has no traffic: excellent!!!\n\n", host);
                return (0);
        }
        else {
                printf("\nHost %s has too much traffic: please try another one.\n\n", host);
                return (1);
        }
}



mot clé : intrusion reseau spoofscan vpn attaques dos c c++ securite authentification

Copyright © 2011-2015 authsecu.com. Tous droits réservés. Les marques et marques commerciales mentionnées appartiennent à leurs propriétaires respectifs. L'utilisation de ce site Web sécurité implique l'acceptation des conditions d'utilisation et du règlement sur le respect de la vie privée de Sécurité. IP VPN LAN Téléphonie entreprise Expert de votre Infrastructure Serinya Operateur Telecom