Python経由で外部モジュールなしでIPアドレスをなりすます

Question

IPアドレスを偽装する方法を教えてください。今まで私はScapyモジュールを使用してきましたが、私はそれを自分で作って、それがどのように行われているかを見て、何か新しいことを学びたいと思っています。ここでScapyモジュールとコードは次のとおり

from scapy.all import * 

SPOOFED_PACKET = IP(src=SRC_IP, dst=DST_IP)/TCP(sport=SRC_PORT, dport=DST_PORT)/PAYLOAD 
send(SPOOFED_PACKET) 

Answer 1

"""Demonstrates how to construct and send raw Ethernet packets on the 
network. 
You probably need root privs to be able to bind to the network interface, 
e.g.: 
    $ sudo python sendeth.py 
""" 

from socket import * 

def sendeth(src, dst, eth_type, payload, interface = "eth0"): 
    """Send raw Ethernet packet on interface.""" 

    assert(len(src) == len(dst) == 6) # 48-bit ethernet addresses 
    assert(len(eth_type) == 2) # 16-bit ethernet type 

    s = socket(AF_PACKET, SOCK_RAW) 

    # From the docs: "For raw packet 
    # sockets the address is a tuple (ifname, proto [,pkttype [,hatype]])" 
    s.bind((interface, 0)) 
    return s.send(src + dst + eth_type + payload) 

if __name__ == "__main__": 
    print("Sent %d-byte Ethernet packet on eth0" % 
    sendeth("\xFE\xED\xFA\xCE\xBE\xEF", 
      "\xFE\xED\xFA\xCE\xBE\xEF", 
      "\x7A\x05", 
      "hello")) 

IPv4ヘッダを含めるには：

"""Demonstrates how to construct and send raw Ethernet packets on the 
network. 

You probably need root privs to be able to bind to the network interface, 
e.g.: 

    $ sudo python sendeth.py 
""" 

from socket import * 

def sendeth(ethernet_packet, payload, interface = "eth0"): 
    """Send raw Ethernet packet on interface.""" 
    s = socket(AF_PACKET, SOCK_RAW) 

    # From the docs: "For raw packet 
    # sockets the address is a tuple (ifname, proto [,pkttype [,hatype]])" 
    s.bind((interface, 0)) 
    return s.send(ethernet_packet + payload) 

def pack(byte_sequence): 
    """Convert list of bytes to byte string.""" 
    return b"".join(map(chr, byte_sequence)) 

if __name__ == "__main__": 
     # Note that this example contains HARDCODED packets, meaning that 
     # it will ONLY work on the system it was designed for. 

     # I got these values by sending a ping while running Wireshark. 
     # You can do so yourself. Another way to construct these manually is to use 
     # the impacket library (sudo pip install impacket) 

     # src=fe:ed:fa:ce:be:ef, dst=52:54:00:12:35:02, type=0x0800 (IP) 
     ethernet_packet = [0x52, 0x54, 0x00, 0x12, 0x35, 0x02, 0xfe, 0xed, 0xfa, 
         0xce, 0xbe, 0xef, 0x08, 0x00] 

     # src=10.0.2.15, dst=195.88.54.16 (vg.no), checksum, etc. 
     ipv4_header = [0x45, 0x00, 0x00, 0x54, 0x05, 0x9f, 0x40, 0x00, 0x40, 0x01, 
        0x2f, 0x93, 0x0a, 0x00, 0x02, 0x0f, 0xc3, 0x58, 0x36, 0x10] 

     # echo (ping) request, checksum 2b45, etc 
     icmp_ping = [0x08, 0x00, 0x2b, 0x45, 0x11, 0x22, 0x00, 0x02, 0xa9, 0xf4, 0x5c, 
        0x53, 0x00, 0x00, 0x00, 0x00, 0xf5, 0x7b, 0x01, 0x00, 0x00, 0x00, 
        0x00, 0x00, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 
        0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 
        0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 
        0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37] 

     payload = "".join(map(chr, ipv4_header + icmp_ping)) 

     # Construct Ethernet packet with an IPv4 ICMP PING request as payload 
     r = sendeth(pack(ethernet_packet), 
        pack(ipv4_header + icmp_ping)) 
     print("Sent Ethernet w/IPv4 ICMP PING payload of length %d bytes" % r)