# This file is part of the Wapiti project (https://wapiti-scanner.github.io)
# Copyright (C) 2020-2026 Nicolas Surribas
# Copyright (C) 2020-2024 Cyberwatch
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
# This module can help to quickly find weak or default credentials in a web application.
# You should not rely on this module for performance or fine-tuned brute force attack.
# Using well-known tools like Hydra, Patator, Wfuzz or other tools supporting parallelism is recommended.
# This module may be handy for CTF though.
from os.path import join as path_join
from itertools import product
import asyncio
from typing import Optional, Tuple

from httpx import RequestError

from wapitiCore.attack.attack import Attack
from wapitiCore.language.vulnerability import Messages
from wapitiCore.definitions.credentials import CredentialsFinding
from wapitiCore.net.web import http_repr
from wapitiCore.parsers.html_parser import Html
from wapitiCore.net.response import Response
from wapitiCore.net import Request
from wapitiCore.main.log import log_red


class ModuleBruteLoginForm(Attack):
    """Attempt to log in on authentication forms using known weak credentials (like admin/admin)."""
    name = "brute_login_form"
    PASSWORDS_FILE = "passwords.txt"
    USERS_FILE = "users.txt"
    SUCCESS_FILE = "successMessage.txt"
    FAILURE_FILE = "incorrectMessage.txt"

    do_get = True
    do_post = True

    def check_success_auth(self, content_response: str):
        with open(
            path_join(self.DATA_DIR, self.SUCCESS_FILE),
            errors="ignore",
            encoding='utf-8'
        ) as success_pattern_file:
            for success_pattern in success_pattern_file:
                if success_pattern.strip() in content_response:
                    return True

        return False

    def get_usernames(self):
        with open(
            path_join(self.DATA_DIR, self.USERS_FILE),
            errors="ignore",
            encoding='utf-8'
        ) as username_file:
            for line in username_file:
                username = line.strip()
                if username:
                    yield username

    def get_passwords(self):
        with open(
            path_join(self.DATA_DIR, self.PASSWORDS_FILE),
            errors="ignore",
            encoding='utf-8'
        ) as password_file:
            for line in password_file:
                password = line.strip()
                if password:
                    yield password

    # pylint: disable=too-many-positional-arguments
    async def send_credentials(
            self,
            login_form: Request,
            username_index: int,
            password_index: int,
            username: str,
            password: str,
    ) -> Tuple[Request, Response]:
        post_params = login_form.post_params
        get_params = login_form.get_params

        if login_form.method == "POST":
            post_params[username_index][1] = username
            post_params[password_index][1] = password
        else:
            get_params[username_index][1] = username
            get_params[password_index][1] = password

        login_request = Request(
            path=login_form.url,
            method=login_form.method,
            post_params=post_params,
            get_params=get_params,
            referer=login_form.referer,
            link_depth=login_form.link_depth
        )

        login_response = await self.crawler.async_send(
            login_request,
            follow_redirects=True
        )

        return login_request, login_response

    async def must_attack(self, request: Request, response: Optional[Response] = None):
        # We leverage the fact that the crawler will fill password entries with a known placeholder
        if "Letm3in_" not in request.encoded_data + request.encoded_params:
            return False

        if response.is_directory_redirection:
            return False

        # We may want to remove this but if not available fallback to target URL
        if not request.referer:
            return False

        return True

    async def attack(self, request: Request, response: Optional[Response] = None):
        # First, we get the referer URL of the login request, we should find the login form there
        try:
            response = await self.crawler.async_send(Request(request.referer, "GET"), follow_redirects=True)
        except RequestError:
            self.network_errors += 1
            return

        page = Html(response.content, request.referer)
        login_form, username_field_idx, password_field_idx = page.find_login_form()
        if not login_form:
            return

        try:
            __, failure_response = await self.send_credentials(
                login_form,
                username_field_idx, password_field_idx,
                "invalid", "invalid"
            )

            if self.check_success_auth(failure_response.content):
                # Ignore this case as it raises false positives
                return
        except RequestError:
            self.network_errors += 1
            return

        tasks = set()
        pending_count = 0
        found = False

        creds_iterator = product(self.get_usernames(), self.get_passwords())
        while True:
            if pending_count < self.options["tasks"] and not found:
                try:
                    username, password = next(creds_iterator)
                except StopIteration:
                    pass
                else:
                    task = asyncio.create_task(
                        self.test_credentials(
                            login_form,
                            username_field_idx,
                            password_field_idx,
                            username,
                            password,
                            failure_response.content
                        )
                    )
                    tasks.add(task)

            if not tasks:
                break

            done_tasks, pending_tasks = await asyncio.wait(
                tasks,
                timeout=0.01,
                return_when=asyncio.FIRST_COMPLETED
            )
            pending_count = len(pending_tasks)
            for task in done_tasks:
                try:
                    result = await task
                except RequestError:
                    self.network_errors += 1
                else:
                    if result:
                        found = True
                        username, password, evil_request, response = result
                        vuln_message = f"Credentials found for URL {request.referer} : {username} / {password}"

                        await self.add_low(
                            finding_class=CredentialsFinding,
                            request=evil_request,
                            info=vuln_message,
                            response=response
                        )

                        log_red("---")
                        log_red(vuln_message)
                        log_red(Messages.MSG_EVIL_REQUEST)
                        log_red(http_repr(evil_request))
                        log_red("---")

                tasks.remove(task)

            if found:
                # If we found valid credentials, we need to stop pending tasks as they may generate false positives
                # because the session is opened on the website and next attempts may appear as logged in
                for task in pending_tasks:
                    task.cancel()
                    tasks.remove(task)

    # pylint: disable=too-many-positional-arguments
    async def test_credentials(self, login_form, username_idx, password_idx, username, password, failure_text):
        request, response = await self.send_credentials(
                login_form,
                username_idx, password_idx,
                username, password
        )

        if self.check_success_auth(response.content) and failure_text != response.content:
            return username, password, request, response

        return None
