Sindbad~EG File Manager

# coding=utf-8
#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2020 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENCE.TXT
#

# pylint: disable=no-absolute-import
import configparser
import os
import sys

import subprocess
from enum import Enum
from functools import wraps
from jwt import exceptions
from typing import AnyStr, Tuple, Optional

from clcommon.lib.consts import CLN_JWT_TOKEN_PATH, CL_EDITION_FILE_FOR_USERS
from clcommon.lib.jwt_token import read_jwt, decode_jwt, jwt_token_check
from clcommon.clexception import FormattedException
from clcommon.clcagefs import in_cagefs

CL_SOLO_EDITION_FILE_MARKER = '/etc/cloudlinux-edition-solo'
CL_ADMIN_EDITION_FILE_MARKER = '/etc/cloudlinux-edition-admin'

SHARED_PRO_EDITION_HUMAN_READABLE = 'CloudLinux OS Shared Pro'
SHARED_EDITION_HUMAN_READABLE = 'CloudLinux OS Shared'
SOLO_EDITION_HUMAN_READABLE = 'CloudLinux OS Solo'
ADMIN_EDITION_HUMAN_READABLE = 'CloudLinux OS Admin'


class SupportedEditions(Enum):
    """
    Keeps supported CloudLinux editions
    """

    SOLO = 'solo'
    SHARED = 'shared'
    SHARED_PRO = 'shared_pro'
    ADMIN = 'admin'


class CLEditionDetectionError(FormattedException):
    def __init__(self, message, **context):
        FormattedException.__init__(self, {
            'message': message,
            'context': context
        })


HUMAN_READABLE_TOKEN_EDITION_PAIRS = {
    SOLO_EDITION_HUMAN_READABLE: SupportedEditions.SOLO.value,
    SHARED_PRO_EDITION_HUMAN_READABLE: SupportedEditions.SHARED_PRO.value,
    SHARED_EDITION_HUMAN_READABLE: SupportedEditions.SHARED.value,
    ADMIN_EDITION_HUMAN_READABLE: SupportedEditions.ADMIN.value
}


class CLEditions:

    @staticmethod
    def get_from_jwt(token=None, verify_exp=True):
        """
        Note: be careful when modifying this method.
        Passing token in is used in X-Ray,
        ask @dkavchuk or someone else from C-Projects team for details
        :param token:
        :param verify_exp:
        :return:
        """
        if token is None:
            token = read_jwt(CLN_JWT_TOKEN_PATH)
        try:
            jwt = decode_jwt(token, verify_exp=verify_exp)
        except exceptions.PyJWTError as e:
            raise CLEditionDetectionError(f'Unable to detect edition from jwt token: {CLN_JWT_TOKEN_PATH}. '
                                          f'Please, make sure it is not broken, error: {e}')
        try:
            return jwt['edition']
        except KeyError:
            # fallback for old format of tokens
            cl_plus = jwt.get('cl_plus')
            if cl_plus is None:
                raise CLEditionDetectionError(
                    f'Unable to detect edition from jwt token: {CLN_JWT_TOKEN_PATH}. '
                    f'Please, make sure it is not broken, error: not enough fields for detection')
            return SupportedEditions.SHARED_PRO.value if cl_plus else SupportedEditions.SHARED.value

    @staticmethod
    def is_package_installed(package_name):
        process = subprocess.Popen(['rpm', '-q', package_name],
                                   stdout=subprocess.PIPE,
                                   stderr=subprocess.PIPE,
                                   text=True)
        out, err = process.communicate()
        if process.returncode != 0 and 'is not installed' in out:
            return False
        elif process.returncode != 0:
            raise CLEditionDetectionError(f'Unable to check is package {package_name} is installed, '
                                          f'reason: {out}, {err}')
        return True

    @classmethod
    def get_cl_edition(cls, skip_jwt_check=False, skip_marker_check=False,
                       raw_jwt=None, verify_exp=True):
        """
        1. Try to detect edition from jwt token
           if edition field is in token -> return edition
           if edition field is not present -> recheck via cl_plus flag
           if token is broken -> raise error about it
        2. Try to detect from file
           if edition is in file -> return edition
           if file is broken -> raise about it
           if file is missed -> check if meta package is present
           Detection from file may be switched off using skip_marker_check
        In case there is no token with correct edition,
        no file we consider edition as regular CL.
        Note: be careful when modifying this method.
        It is used in X-Ray, ask @dkavchuk or someone else from C-Projects team
        for details
        """
        # skipping both jwt and file checks is not allowed
        if skip_jwt_check and skip_marker_check:
            raise CLEditionDetectionError(
                'Unable to detect edition: neither jwt token check, no file marker check enabled')

        if not skip_jwt_check and os.path.isfile(CLN_JWT_TOKEN_PATH):
            try:
                edition = cls.get_from_jwt(token=raw_jwt, verify_exp=verify_exp)
            except PermissionError:
                edition = user_cl_edition()

            if edition:
                return edition

        # In case if user in cagefs.
        if in_cagefs():
            return user_cl_edition()

        # if fallback to file is applicable
        if not skip_marker_check:
            # jwt has no 'edition' field -> ensure it is really solo via file
            if os.path.isfile(CL_SOLO_EDITION_FILE_MARKER):
                return SupportedEditions.SOLO.value
            elif os.path.isfile(CL_ADMIN_EDITION_FILE_MARKER):
                return SupportedEditions.ADMIN.value
            return user_cl_edition() or SupportedEditions.SHARED.value


def is_cl_solo_edition(skip_jwt_check=True, skip_marker_check=False, verify_exp=True):
    """
    Allow skip_jwt_check ONLY if it not critical when license is not valid
    Use skip_marker_check=True when validity of license is critical
     and fallback to file is not applicable
    Note: be careful when modifying this method.
    It is used in X-Ray and SSA,
    ask @dkavchuk or someone else from C-Projects team for details
    """

    edition = CLEditions.get_cl_edition(
        skip_jwt_check=skip_jwt_check,
        skip_marker_check=skip_marker_check,
        verify_exp=verify_exp
    )
    return edition is not None and edition == SupportedEditions.SOLO.value


def is_cl_shared_edition(skip_jwt_check=False, skip_marker_check=False, verify_exp=True):
    """
    Allow skip_jwt_check ONLY if it not critical when license is not valid
    Use skip_marker_check=True when validity of license is critical
     and fallback to file is not applicable
    """

    edition = CLEditions.get_cl_edition(
        skip_jwt_check=skip_jwt_check,
        skip_marker_check=skip_marker_check,
        verify_exp=verify_exp
    )
    return edition is not None and edition == SupportedEditions.SHARED.value


def is_cl_shared_pro_edition(skip_jwt_check=False,
                             skip_marker_check=False,
                             verify_exp=True):
    """
    Allow skip_jwt_check ONLY if it not critical when license is not valid
    Use skip_marker_check=True when validity of license is critical
     and fallback to file is not applicable
    """

    edition = CLEditions.get_cl_edition(
        skip_jwt_check=skip_jwt_check,
        skip_marker_check=skip_marker_check,
        verify_exp=verify_exp
    )
    return edition is not None and edition == SupportedEditions.SHARED_PRO.value


def is_cl_admin_edition(skip_jwt_check=False,
                        skip_marker_check=False,
                        verify_exp=True):
    """
    Allow skip_jwt_check ONLY if it not critical when license is not valid
    Use skip_marker_check=True when validity of license is critical
     and fallback to file is not applicable
    """

    edition = CLEditions.get_cl_edition(
        skip_jwt_check=skip_jwt_check,
        skip_marker_check=skip_marker_check,
        verify_exp=verify_exp
    )
    return edition is not None and edition == SupportedEditions.ADMIN.value


def get_cl_edition_readable() -> AnyStr:
    """
    Function returns current edition of CL:
    - CloudLinux OS Shared
    - CloudLinux OS Shared Pro
    - CloudLinux OS Solo
    - Error string
    """

    try:
        if is_cl_solo_edition(skip_jwt_check=True):
            return SOLO_EDITION_HUMAN_READABLE
        elif is_cl_admin_edition(skip_jwt_check=True):
            return ADMIN_EDITION_HUMAN_READABLE
    except CLEditionDetectionError:
        return SHARED_EDITION_HUMAN_READABLE

    success_flag, error_message, _ = jwt_token_check()

    # This error message indicates that user could not read jwt.token because not enough privileges
    # We have to check existence of token file, to be sure that privilege error acquired
    if 'read error' in error_message and (os.path.isfile(CLN_JWT_TOKEN_PATH) or in_cagefs()):
        with open(CL_EDITION_FILE_FOR_USERS, 'r') as f:
            return f.read().strip()

    if success_flag:
        return SHARED_PRO_EDITION_HUMAN_READABLE
    else:
        return SHARED_EDITION_HUMAN_READABLE


def print_skip_message_on_solo():
    """Just print skip message"""
    print('CloudLinux Solo edition detected! \n'
          'Command is skipped, because it is unsupported and unneeded on current edition')

def print_skip_message_in_container():
    """Just print skip message"""
    print('Container environment detected! \n'
          'Command is skipped, because it is unsupported and unneeded on current edition')


def skip_on_cl_solo():
    # TODO: rename me one day to skip_without_lve
    #       it was much easier to just change this method
    #       instead of making patches to many tools
    #       but let's rename it to something like skip_if_lve_missing
    try:
        # we still have some utils that could be run
        # under user (e.g cloudlinux-selector)
        if is_cl_solo_edition(skip_jwt_check=True):
            print_skip_message_on_solo()
            sys.exit(0)
        if is_container():
            print_skip_message_in_container()
            sys.exit(0)
    except CLEditionDetectionError as e:
        print(f'Error: {e}')
        sys.exit(1)


# renamed method that we must use one day in the future
skip_without_lve = skip_on_cl_solo


def lve_supported_or_exit(f):
    @wraps(f)
    def inner(*args, **kwargs):
        if is_cl_solo_edition(skip_jwt_check=True) \
                or is_container():
            print_skip_message_on_solo()
            return None
        else:
            return f(*args, **kwargs)

    return inner


def user_cl_edition():
    """This function is used as workaround for users to be able to get CL Edition.
    Crontab will write to CL_EDITION_FILE_FOR_USERS, output of cldetect --detect-edition command with 0644 permission.
    """
    if os.path.exists(CL_EDITION_FILE_FOR_USERS):
        with open(CL_EDITION_FILE_FOR_USERS, 'r') as f:
            edition = f.read().strip()

        return HUMAN_READABLE_TOKEN_EDITION_PAIRS.get(edition)
    return None


def get_os_version() -> Tuple[Optional[str], Optional[str]]:
    """
    Detect system name and version
    :return: tuple (os_name, os_ver)
    """
    # # cat /etc/os-release | grep -E '^NAME|^VERSION_ID'
    # NAME="Ubuntu"
    # VERSION_ID="20.04"
    # # cat /etc/os-release | grep -E '^NAME|^VERSION_ID'
    # NAME="CloudLinux"
    # VERSION_ID="7.9"
    try:
        os_release_filename = '/etc/os-release'
        section_name = 'top'
        config = configparser.ConfigParser()
        # config.read('/etc/os-release')
        with open(os_release_filename) as stream:
            config.read_string(f"[{section_name}]\n" + stream.read())
        os_name = config.get(section_name, 'NAME').strip('"')
        os_ver = config.get(section_name, 'VERSION_ID').strip('"')
        return os_name, os_ver
    except (OSError, IOError, configparser.Error):
        pass
    return None, None


def is_ubuntu() -> bool:
    """
    Detertmines is this system Ubuntu
    :return: bool flag is_ubuntu
    """
    os_name, _ = get_os_version()
    return os_name == 'Ubuntu'


def is_container() -> bool:
    """
    Determines is this system running inside container
    """
    return os.path.exists('/etc/cloudlinux-container')


def is_secureboot_enabled() -> bool:
    """
    Determines if secure boot is turned on
    :return: bool flag is_secureboot_enabled
    """
    enabled = False
    if os.path.exists('/sys/firmware/efi'):
        enabled = subprocess.call('mokutil --sb-state | grep enabled',
                                  shell=True, executable='/bin/bash',
                                  stdout=subprocess.DEVNULL, stderr=subprocess.DEVNULL) == 0
    return enabled