#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import cmd
import configparser
import csv
import os
from os import listdir
from os.path import exists
from os.path import join as path_join
import shutil
from sqlite3 import connect
import sys
from textwrap import dedent

from requests import get, post, ConnectionError
from sqlalchemy import create_engine
from terminaltables import AsciiTable

from cme.loaders.protocolloader import ProtocolLoader
from cme.paths import CONFIG_PATH, WS_PATH, WORKSPACE_DIR


class UserExitedProto(Exception):
    pass


def create_db_engine(db_path):
    db_engine = create_engine(f"sqlite:///{db_path}", isolation_level="AUTOCOMMIT", future=True)
    return db_engine


def print_table(data, title=None):
    print("")
    table = AsciiTable(data)
    if title:
        table.title = title
    print(table.table)
    print("")


def write_csv(filename, headers, entries):
    """
    Writes a CSV file with the provided parameters.
    """
    with open(os.path.expanduser(filename), "w") as export_file:
        csv_file = csv.writer(
            export_file,
            delimiter=";",
            quoting=csv.QUOTE_ALL,
            lineterminator="\n",
            escapechar="\\",
        )
        csv_file.writerow(headers)
        for entry in entries:
            csv_file.writerow(entry)


def write_list(filename, entries):
    """
    Writes a file with a simple list
    """
    with open(os.path.expanduser(filename), "w") as export_file:
        for line in entries:
            export_file.write(line + "\n")
    return


def complete_import(text, line):
    """
    Tab-complete 'import' commands
    """
    commands = ("empire", "metasploit")
    mline = line.partition(" ")[2]
    offs = len(mline) - len(text)
    return [s[offs:] for s in commands if s.startswith(mline)]


def complete_export(text, line):
    """
    Tab-complete 'creds' commands.
    """
    commands = (
        "creds",
        "plaintext",
        "hashes",
        "shares",
        "local_admins",
        "signing",
        "keys",
    )
    mline = line.partition(" ")[2]
    offs = len(mline) - len(text)
    return [s[offs:] for s in commands if s.startswith(mline)]


def print_help(help_string):
    print(dedent(help_string))


class DatabaseNavigator(cmd.Cmd):
    def __init__(self, main_menu, database, proto):
        cmd.Cmd.__init__(self)
        self.main_menu = main_menu
        self.config = main_menu.config
        self.proto = proto
        self.db = database
        self.prompt = f"cmedb ({main_menu.workspace})({proto}) > "

    def do_exit(self, line):
        self.db.shutdown_db()
        sys.exit()

    @staticmethod
    def help_exit():
        help_string = """
        Exits
        """
        print_help(help_string)

    def do_back(self, line):
        raise UserExitedProto

    def do_export(self, line):
        if not line:
            print("[-] not enough arguments")
            return
        line = line.split()
        command = line[0].lower()
        # Need to use if/elif/else to keep compatibility with py3.8/3.9
        # Reference DB Function cme/protocols/smb/database.py
        # Users
        if command == "creds":
            if len(line) < 3:
                print("[-] invalid arguments, export creds <simple|detailed> <filename>")
                return

            filename = line[2]
            creds = self.db.get_credentials()
            csv_header = (
                "id",
                "domain",
                "username",
                "password",
                "credtype",
                "pillaged_from",
            )

            if line[1].lower() == "simple":
                write_csv(filename, csv_header, creds)
            elif line[1].lower() == "detailed":
                formatted_creds = []

                for cred in creds:
                    entry = [
                        cred[0],  # ID
                        cred[1],  # Domain
                        cred[2],  # Username
                        cred[3],  # Password/Hash
                        cred[4],  # Cred Type
                    ]
                    if cred[5] is None:
                        entry.append("")
                    else:
                        entry.append(self.db.get_hosts(cred[5])[0][2])
                    formatted_creds.append(entry)
                write_csv(filename, csv_header, formatted_creds)
            else:
                print(f"[-] No such export option: {line[1]}")
                return
            print("[+] Creds exported")
        # Hosts
        elif command == "hosts":
            if len(line) < 3:
                print("[-] invalid arguments, export hosts <simple|detailed|signing> <filename>")
                return

            csv_header_simple = (
                "id",
                "ip",
                "hostname",
                "domain",
                "os",
                "dc",
                "smbv1",
                "signing",
            )
            csv_header_detailed = (
                "id",
                "ip",
                "hostname",
                "domain",
                "os",
                "dc",
                "smbv1",
                "signing",
                "spooler",
                "zerologon",
                "petitpotam",
            )
            filename = line[2]

            if line[1].lower() == "simple":
                hosts = self.db.get_hosts()
                simple_hosts = [host[:8] for host in hosts]
                write_csv(filename, csv_header_simple, simple_hosts)
            # TODO: maybe add more detail like who is an admin on it, shares discovered, etc
            elif line[1].lower() == "detailed":
                hosts = self.db.get_hosts()
                write_csv(filename, csv_header_detailed, hosts)
            elif line[1].lower() == "signing":
                hosts = self.db.get_hosts("signing")
                signing_hosts = [host[1] for host in hosts]
                write_list(filename, signing_hosts)
            else:
                print(f"[-] No such export option: {line[1]}")
                return
            print("[+] Hosts exported")
        # Shares
        elif command == "shares":
            if len(line) < 3:
                print("[-] invalid arguments, export shares <simple|detailed> <filename>")
                return

            shares = self.db.get_shares()
            csv_header = ("id", "host", "userid", "name", "remark", "read", "write")
            filename = line[2]

            if line[1].lower() == "simple":
                write_csv(filename, csv_header, shares)
                print("[+] shares exported")
            # Detailed view gets hostname, usernames, and true false statement
            elif line[1].lower() == "detailed":
                formatted_shares = []
                for share in shares:
                    user = self.db.get_users(share[2])[0]
                    if self.db.get_hosts(share[1]): 
                        share_host = self.db.get_hosts(share[1])[0][2] 
                    else: 
                        share_host = "ERROR"

                    entry = (
                        share[0],  # shareID
                        share_host,  # hosts
                        f"{user[1]}\{user[2]}",  # userID
                        share[3],  # name
                        share[4],  # remark
                        bool(share[5]),  # read
                        bool(share[6]),  # write
                    )
                    formatted_shares.append(entry)
                write_csv(filename, csv_header, formatted_shares)
                print("[+] Shares exported")
            else:
                print(f"[-] No such export option: {line[1]}")
                return
        # Local Admin
        elif command == "local_admins":
            if len(line) < 3:
                print("[-] invalid arguments, export local_admins <simple|detailed> <filename>")
                return

            # These values don't change between simple and detailed
            local_admins = self.db.get_admin_relations()
            csv_header = ("id", "userid", "host")
            filename = line[2]

            if line[1].lower() == "simple":
                write_csv(filename, csv_header, local_admins)
            elif line[1].lower() == "detailed":
                formatted_local_admins = []
                for entry in local_admins:
                    user = self.db.get_users(filter_term=entry[1])[0]

                    formatted_entry = (
                        entry[0],  # Entry ID
                        f"{user[1]}/{user[2]}",  # DOMAIN/Username
                        self.db.get_hosts(filter_term=entry[2])[0][2],  # Hostname
                    )
                    # Can't modify a tuple which is what self.db.get_admin_relations() returns
                    formatted_local_admins.append(formatted_entry)
                write_csv(filename, csv_header, formatted_local_admins)
            else:
                print(f"[-] No such export option: {line[1]}")
                return
            print("[+] Local Admins exported")
        elif command == "dpapi":
            if len(line) < 3:
                print("[-] invalid arguments, export dpapi <simple|detailed> <filename>")
                return

            # These values don't change between simple and detailed
            dpapi_secrets = self.db.get_dpapi_secrets()
            csv_header = (
                "id",
                "host",
                "dpapi_type",
                "windows_user",
                "username",
                "password",
                "url",
            )
            filename = line[2]

            if line[1].lower() == "simple":
                write_csv(filename, csv_header, dpapi_secrets)
            elif line[1].lower() == "detailed":
                formatted_dpapi_secret = []
                for entry in dpapi_secrets:
                    formatted_entry = (
                        entry[0],  # Entry ID
                        self.db.get_hosts(filter_term=entry[1])[0][2],  # Hostname
                        entry[2],  # DPAPI type
                        entry[3],  # Windows User
                        entry[4],  # Username
                        entry[5],  # Password
                        entry[6],  # URL
                    )
                    # Can't modify a tuple which is what self.db.get_admin_relations() returns
                    formatted_dpapi_secret.append(formatted_entry)
                write_csv(filename, csv_header, formatted_dpapi_secret)
            else:
                print(f"[-] No such export option: {line[1]}")
                return
            print("[+] DPAPI secrets exported")
        elif command == "keys":
            if line[1].lower() == "all":
                keys = self.db.get_keys()
            else:
                keys = self.db.get_keys(key_id=int(line[1]))
            writable_keys = [key[2] for key in keys]
            filename = line[2]
            write_list(filename, writable_keys)
        else:
            print("[-] Invalid argument, specify creds, hosts, local_admins, shares or dpapi")

    @staticmethod
    def help_export():
        help_string = """
        export [creds|hosts|local_admins|shares|signing|keys] [simple|detailed|*] [filename]
        Exports information to a specified file
        
        * hosts has an additional third option from simple and detailed: signing - this simply writes a list of ips of
        hosts where signing is enabled
        * keys' third option is either "all" or an id of a key to export
            export keys [all|id] [filename]
        """
        print_help(help_string)

    def do_import(self, line):
        if not line:
            return

        if line == "empire":
            headers = {"Content-Type": "application/json"}
            # Pull the username and password from the config file
            payload = {
                "username": self.config.get("Empire", "username"),
                "password": self.config.get("Empire", "password"),
            }
            # Pull the host and port from the config file
            base_url = f"https://{self.config.get('Empire', 'api_host')}:{self.config.get('Empire', 'api_port')}"

            try:
                r = post(
                    base_url + "/api/admin/login",
                    json=payload,
                    headers=headers,
                    verify=False,
                )
                if r.status_code == 200:
                    token = r.json()["token"]
                    url_params = {"token": token}
                    r = get(
                        base_url + "/api/creds",
                        headers=headers,
                        params=url_params,
                        verify=False,
                    )
                    creds = r.json()

                    for cred in creds["creds"]:
                        if cred["credtype"] == "token" or cred["credtype"] == "krbtgt" or cred["username"].endswith("$"):
                            continue
                        self.db.add_credential(
                            cred["credtype"],
                            cred["domain"],
                            cred["username"],
                            cred["password"],
                        )
                    print("[+] Empire credential import successful")
                else:
                    print("[-] Error authenticating to Empire's RESTful API server!")
            except ConnectionError as e:
                print(f"[-] Unable to connect to Empire's RESTful API server: {e}")


class CMEDBMenu(cmd.Cmd):
    def __init__(self, config_path):
        cmd.Cmd.__init__(self)
        self.config_path = config_path

        try:
            self.config = configparser.ConfigParser()
            self.config.read(self.config_path)
        except Exception as e:
            print(f"[-] Error reading cme.conf: {e}")
            sys.exit(1)

        self.conn = None
        self.p_loader = ProtocolLoader()
        self.protocols = self.p_loader.get_protocols()

        self.workspace = self.config.get("CME", "workspace")
        self.do_workspace(self.workspace)

        self.db = self.config.get("CME", "last_used_db")
        if self.db:
            self.do_proto(self.db)

    def write_configfile(self):
        with open(self.config_path, "w") as configfile:
            self.config.write(configfile)

    def do_proto(self, proto):
        if not proto:
            return

        proto_db_path = path_join(WORKSPACE_DIR, self.workspace, f"{proto}.db")
        if exists(proto_db_path):
            self.conn = create_db_engine(proto_db_path)
            db_nav_object = self.p_loader.load_protocol(self.protocols[proto]["nvpath"])
            db_object = self.p_loader.load_protocol(self.protocols[proto]["dbpath"])
            self.config.set("CME", "last_used_db", proto)
            self.write_configfile()
            try:
                proto_menu = getattr(db_nav_object, "navigator")(self, getattr(db_object, "database")(self.conn), proto)
                proto_menu.cmdloop()
            except UserExitedProto:
                pass

    @staticmethod
    def help_proto():
        help_string = """
        proto [smb|mssql|winrm]
            *unimplemented protocols: ftp, rdp, ldap, ssh
        Changes cmedb to the specified protocol
        """
        print_help(help_string)

    def do_workspace(self, line):
        line = line.strip()
        if not line:
            subcommand = ""
            self.help_workspace()
        else:
            subcommand = line.split()[0]

        if subcommand == "create":
            new_workspace = line.split()[1].strip()
            print(f"[*] Creating workspace '{new_workspace}'")
            self.create_workspace(new_workspace, self.p_loader, self.protocols)
            self.do_workspace(new_workspace)
        elif subcommand == "list":
            print("[*] Enumerating Workspaces")
            for workspace in listdir(path_join(WORKSPACE_DIR)):
                if workspace == self.workspace:
                    print("==> " + workspace)
                else:
                    print(workspace)
        elif exists(path_join(WORKSPACE_DIR, line)):
            self.config.set("CME", "workspace", line)
            self.write_configfile()
            self.workspace = line
            self.prompt = f"cmedb ({line}) > "

    @staticmethod
    def help_workspace():
        help_string = """
        workspace [create <targetName> | workspace list | workspace <targetName>]
        """
        print_help(help_string)

    @staticmethod
    def do_exit(line):
        sys.exit()

    @staticmethod
    def help_exit():
        help_string = """
        Exits
        """
        print_help(help_string)

    @staticmethod
    def create_workspace(workspace_name, p_loader, protocols):
        os.mkdir(path_join(WORKSPACE_DIR, workspace_name))

        for protocol in protocols.keys():
            protocol_object = p_loader.load_protocol(protocols[protocol]["dbpath"])
            proto_db_path = path_join(WORKSPACE_DIR, workspace_name, f"{protocol}.db")

            if not exists(proto_db_path):
                print(f"[*] Initializing {protocol.upper()} protocol database")
                conn = connect(proto_db_path)
                c = conn.cursor()

                # try to prevent some weird sqlite I/O errors
                c.execute("PRAGMA journal_mode = OFF")
                c.execute("PRAGMA foreign_keys = 1")

                getattr(protocol_object, "database").db_schema(c)

                # commit the changes and close everything off
                conn.commit()
                conn.close()


def delete_workspace(workspace_name):
    shutil.rmtree(path_join(WORKSPACE_DIR, workspace_name))


def initialize_db(logger):
    if not exists(path_join(WS_PATH, "default")):
        logger.debug("Creating default workspace")
        os.mkdir(path_join(WS_PATH, "default"))

    p_loader = ProtocolLoader()
    protocols = p_loader.get_protocols()
    for protocol in protocols.keys():
        protocol_object = p_loader.load_protocol(protocols[protocol]["dbpath"])
        proto_db_path = path_join(WS_PATH, "default", f"{protocol}.db")

        if not exists(proto_db_path):
            logger.debug(f"Initializing {protocol.upper()} protocol database")
            conn = connect(proto_db_path)
            c = conn.cursor()
            # try to prevent some weird sqlite I/O errors
            c.execute("PRAGMA journal_mode = OFF")  # could try setting to PERSIST if DB corruption starts occurring
            c.execute("PRAGMA foreign_keys = 1")
            # set a small timeout (5s) so if another thread is writing to the database, the entire program doesn't crash
            c.execute("PRAGMA busy_timeout = 5000")
            getattr(protocol_object, "database").db_schema(c)
            # commit the changes and close everything off
            conn.commit()
            conn.close()


def main():
    if not exists(CONFIG_PATH):
        print("[-] Unable to find config file")
        sys.exit(1)
    try:
        cmedbnav = CMEDBMenu(CONFIG_PATH)
        cmedbnav.cmdloop()
    except KeyboardInterrupt:
        pass


if __name__ == "__main__":
    main()