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# -*- coding: utf-8 -*-

# CLDETECT python lib

#
# Copyright © Cloud Linux GmbH & Cloud Linux Software, Inc 2010-2019 All Rights Reserved
#
# Licensed under CLOUD LINUX LICENSE AGREEMENT
# http://cloudlinux.com/docs/LICENSE.TXT

# Detection:
#
# Control Panel name & version
# Control Panel name
# Control Panel admin email
# CXS is installed
# mod_suphp is enabled for easyapache on cPanel
# get apache gid
# Detect LiteSpeed
# Detect PostGreSQL
# Detect admin user for DirectAdmin control panel
# Detect CloudLinux instalation process
# Detect Nagios
# Detect if cloudlinux=yes is present for DirectAdmin
# Get fs.enforce_symlinksifowner from /etc/sysctl.conf
# Detect suEXEC
# Detect suPHP
# Check suEXEC or suPHP for SecureLVE jail
# Check /etc/ssh/sshd_config for UsePAM yes
# Separate functions for detect machines: is_da, is_isp, etc
# Detect cagefs installed

import os
import pwd
import re
import subprocess
import sys
from configparser import ConfigParser, NoSectionError, NoOptionError

from clcommon import cpapi
from clcommon.sysctl import SysCtlConf, SYSCTL_CL_CONF_FILE

# Control panel name
CP_NAME = None
# Control panel version
CP_VERSION = None
# If CP_NAME is "ISPManager" and CP_VERSION is "5.xx" ISP5 Type: "Master" or "Node".
# else - always None
CP_ISP_TYPE = None
CP_ADMIN_EMAIL = None
NAGIOS_GID = 0
APACHE_GID = 48
APACHE_UNAME = 'apache'
LITESPEED_CONFIG_FILE = '/usr/local/lsws/conf/httpd_config.xml'
LITESPEED_OPEN_CONFIG_FILE = '/usr/local/lsws/conf/httpd_config.conf'
LITESPEED_VERSION_FILE = '/usr/local/lsws/VERSION'
POSTGRE_SERVER_FILE = None
POSTGRE_SYSTEMD_PATH = '/usr/lib/systemd/system/postgresql.service'
POSTGRE_INITD_PATH = '/etc/rc.d/init.d/postgresql'
CL_SETUP_LOCK_FILE = '/var/lock/cldeploy.lck'
CL_CONFIG_FILE = '/etc/sysconfig/cloudlinux'
USEPAM_FILE = '/etc/ssh/sshd_config'
SUEXEC_ENABLED = None
SUPHP_ENABLED = None

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


if os.path.isfile(POSTGRE_SYSTEMD_PATH):
    POSTGRE_SERVER_FILE = POSTGRE_SYSTEMD_PATH
else:
    POSTGRE_SERVER_FILE = POSTGRE_INITD_PATH


def is_ea4():
    if os.path.exists('/etc/cpanel/ea4/is_ea4'):
        return True
    return False


# This function get CP name and CP version
def getCP():
    global CP_NAME
    global CP_VERSION
    global CP_ISP_TYPE

    CP_NAME = 'Unknown'
    CP_VERSION = '0'
    CP_ISP_TYPE = None

    ####################################################################
    # Try to detect panels, supported by CL and custom panel with cpapi plugin
    try:
        panel_data = cpapi.get_cp_description()
        CP_NAME = panel_data['name']
        CP_VERSION = panel_data['version']
        CP_ISP_TYPE = panel_data['additional_info']
    except Exception:
        pass

    # Try to detect some other panels without retrieving info about them
    ####################################################################
    # H-Sphere
    try:
        with open('/hsphere/shared/version', encoding='utf-8') as f:
            data = f.read()
            release = re.findall(r'Release:\s+(.+)', data)[0]
            version = re.findall(r'Version:\s+(.+)', data)[0]
            CP_NAME = 'H-Sphere'
            CP_VERSION = f'{release}.{version}'
            return True
    except Exception:
        pass

    ####################################################################
    # HostingNG check
    if os.path.isfile('/lib64/libnss_ng.so'):
        CP_NAME = 'HostingNG'
        CP_VERSION = 'none'
        return True

    ####################################################################
    # CentOS Web Panel check
    if os.path.isdir('/usr/local/cwpsrv'):
        CP_NAME = 'CentOS_WEB_Panel'
        CP_VERSION = 'none'
        return True

    # Atomia check: (what is atomia you can see at www.atomia.com)
    # Atomia is more than just CP inside the CloudLinux,
    # So we just check presence of Atomia program agent
    # by its footprints - config files, which agent created.
    if os.path.isfile('/etc/httpd/conf.d/atomia-pa-apache.conf') or\
            os.path.isdir('/storage/configuration/cloudlinux'):
        CP_NAME = 'Atomia_agent'
        CP_VERSION = 'none'
        return True
    # Cyber Panel
    if os.path.isdir('/usr/local/CyberCP'):
        CP_NAME = 'Cyberpanel'
        CP_VERSION = 'none'
        return True

    # Planet Hoster
    if os.path.isdir('/var/phmgr'):
        CP_NAME = 'PlaneHoster'
        CP_VERSION = 'none'
        return True

    # Vesta CP, check it`s main dir
    # can install from https://vestacp.com/install/
    if os.path.isdir('/usr/local/vesta'):
        CP_NAME = 'Vesta'
        CP_VERSION = 'none'
        return True

    # we can check is VirtualminWebmin installed, by checking license file
    # file is always present, license serial and key
    # are predefined in the beginning of the installation script
    if os.path.isfile('/etc/virtualmin-license'):
        CP_NAME = 'VirtualminWebmin'
        CP_VERSION = 'none'
        return True

    if os.path.isfile('/usr/local/webuzo/universal.php'):
        CP_NAME = 'Webuzo'
        CP_VERSION = 'none'
        return True

    # No panel detected
    return False


# Get params value from file
def get_param_from_file(file_name, param_name, separator=None, default_val=''):
    try:
        with open(file_name, 'r', encoding='utf-8') as f:
            content = f.readlines()
    except IOError:
        return default_val
    for line in content:
        line = line.strip()
        if line.startswith(param_name):
            lineParts = line.split(separator)
            if (len(lineParts) == 2) and (lineParts[0].strip() == param_name):
                return lineParts[1].strip()
    return default_val


# This function get CP name only
def getCPName():
    global CP_NAME
    if CP_NAME:
        return CP_NAME

    # cPanel check
    if os.path.isfile('/usr/local/cpanel/cpanel'):
        CP_NAME = 'cPanel'

    # Plesk check
    elif os.path.isfile('/usr/local/psa/version'):
        CP_NAME = 'Plesk'

    # DirectAdmin check
    elif os.path.isfile('/usr/local/directadmin/directadmin'):
        CP_NAME = 'DirectAdmin'

    # ISPmanager v4 or v5 check
    elif os.path.isfile('/usr/local/ispmgr/bin/ispmgr') or os.path.isdir('/usr/local/mgr5'):
        CP_NAME = 'ISPManager'

    # InterWorx check
    elif os.path.isdir('/usr/local/interworx'):
        CP_NAME = 'InterWorx'

    # HSphere check
    elif os.path.isdir('/hsphere/shared'):
        CP_NAME = 'H-Sphere'
    elif os.path.isfile('/lib64/libnss_ng.so'):
        CP_NAME = 'HostingNG'

    # CentOS Web Panel check
    elif os.path.isdir('/usr/local/cwpsrv'):
        CP_NAME = 'CentOS_WEB_Panel'

    elif os.path.isfile('/etc/httpd/conf.d/atomia-pa-apache.conf')\
            or os.path.isdir('/storage/configuration/cloudlinux'):
        CP_NAME = 'Atomia_agent'

    elif os.path.isdir('/usr/local/vesta'):
        CP_NAME = 'Vesta'

    elif os.path.isfile('/etc/virtualmin-license'):
        CP_NAME = 'VirtualminWebmin'

    elif os.path.isdir('/var/phmgr'):
        CP_NAME = 'PlaneHoster'

    elif os.path.isdir('/usr/local/CyberCP'):
        CP_NAME = 'Cyberpanel'

    elif os.path.isfile('/usr/local/webuzo/universal.php'):
        CP_NAME = 'Webuzo'

    else:
        # detect custom panel name
        panel_data = cpapi.get_cp_description()
        if panel_data:
            # Panel detected
            CP_NAME = panel_data['name']
        else:
            CP_NAME = 'Unknown'

    return CP_NAME


def add_server_stats(status_report):
    """
    Add server statistics to status_report dict
    :param status_report: dict to add statistics to
    :type status_report: dict
    """
    from clcommon import ClPwd  # pylint: disable=import-outside-toplevel
    res = {}
    cp_name = getCPName()
    if cp_name != 'Unknown':
        res['cp'] = cp_name
    if cp_name == 'Plesk':
        clpwd = ClPwd(10000)
    else:
        clpwd = ClPwd()
    d = clpwd.get_uid_dict()
    users = 0
    sys_users = {
        'nfsnobody', 'avahi-autoipd', 'exim', 'clamav', 'varnish', 'nagios', 'saslauth', 'mysql', 'lsadm',
        'systemd-bus-proxy', 'systemd-network', 'polkitd', 'firebird', 'nginx', 'dovecot', 'dovenull',
        'roundcube_sysuser', 'cpanel', 'cpanelhorde', 'cpanelphpmyadmin', 'cpanelphppgadmin',
        'cpanelroundcube', 'mailman', 'cpaneleximfilter', 'cpanellogaholic', 'cpanellogin', 'munin',
        'cpaneleximscanner', 'cpanelphpgadmin', 'cpses', 'cpanelconnecttrack', 'cpanelrrdtool', 'admin',
        'webapps', 'apache', 'diradmin', 'majordomo', 'viapm', 'iworx', 'iworx-web', 'iworx-pma',
        'iworx-backup', 'iworx-horde', 'iworx-roundcube', 'iworx-sqmail', 'iworx_support_user', 'psaadm',
        'popuser', 'psaftp', 'drweb', 'sw-cp-server', 'horde_sysuser'
    }
    for pw_entries in d.values():
        found = False
        for entry in pw_entries:
            if entry.pw_name in sys_users:
                found = True
                break
        if not found:
            users += 1
    res['users'] = users
    status_report['cln'] = res


# Control Panel admin email
def getCPAdminEmail():
    global CP_ADMIN_EMAIL
    if CP_ADMIN_EMAIL:
        return CP_ADMIN_EMAIL

    if not os.path.isfile(CL_CONFIG_FILE):
        print('Error: missing ' + CL_CONFIG_FILE + ' config file.')
        sys.exit(1)
    try:
        parser = ConfigParser(interpolation=None,
                              strict=False)
        parser.read(CL_CONFIG_FILE)
        if parser.get('license_check', 'EMAIL').strip().find('@') != -1:
            CP_ADMIN_EMAIL = parser.get('license_check', 'EMAIL').strip()
        else:
            try:
                getCPName()
                get_email_script = parser.get('license_check', CP_NAME + '_getemail_script')
                if not os.path.isfile(get_email_script):
                    raise FileNotFoundError
                with subprocess.Popen(
                    [get_email_script],
                    stdout=subprocess.PIPE,
                    stderr=subprocess.PIPE,
                    text=True,
                ) as proc:
                    out, _ = proc.communicate()
                CP_ADMIN_EMAIL = out.strip()
            except (NoSectionError, NoOptionError, FileNotFoundError):
                CP_ADMIN_EMAIL = 'root@localhost.localdomain'
        return CP_ADMIN_EMAIL
    except Exception:
        print('Error: bad ' + CL_CONFIG_FILE + ' config file.')
        sys.exit(1)


# Check is CXS installed
def CXS_check():
    return os.path.isdir('/etc/cxs')


# Check is mod_suphp is enabled in easyapache on cPanel
# TODO check cagefs_posteasyapache_hook.sh for suPHP check via /usr/local/cpanel/bin/rebuild_phpconf --available
def mod_suPHP_check():
    getCPName()
    if CP_NAME != 'cPanel':
        return False

    return os.path.isfile('/usr/local/apache/modules/mod_suphp.so')


# Get Apache gid
def get_apache_gid():
    getCPName()
    global APACHE_GID
    global APACHE_UNAME
    if CP_VERSION == '0':
        return False

    if CP_NAME == 'cPanel':
        APACHE_UNAME = 'nobody'

    if CP_NAME == 'H-Sphere':
        APACHE_UNAME = 'httpd'

    # line 24 | APACHE_UNAME = 'apache' - for others control panel (DA,ISP,IWorx,Plesk)

    try:
        APACHE_GID = pwd.getpwnam(APACHE_UNAME).pw_gid
    except Exception:
        pass
    return True


# Detect LiteSpeed
def detect_litespeed():
    """
    LiteSpeed can be enterprise or open source, and each of them
    stores config in different formats
    So this checker will search for one of them
    """
    return detect_enterprise_litespeed() or detect_open_litespeed()


def detect_enterprise_litespeed():
    """
    Detects LSWS Enterprise presence
    """
    return os.path.isfile(LITESPEED_CONFIG_FILE)


def detect_open_litespeed():
    """
    Detects OpenLiteSpeed presence
    """
    return os.path.isfile(LITESPEED_OPEN_CONFIG_FILE)


def get_litespeed_version():
    """
    Determine Litespeed version.
    Works for both LSWS Enterprise and OpenLiteSpeed.
    """
    try:
        # Content of LITESPEED_VERSION_FILE: '5.4.12'
        with open(LITESPEED_VERSION_FILE, 'r', encoding='utf-8') as f:
            return f.read().strip()
    except (FileNotFoundError, OSError, IOError):
        return ''


# Detect PostGreSQL
def detect_postgresql():
    return os.path.isfile(POSTGRE_SERVER_FILE)


# Detect DirectAdmin admin user
def detect_DA_admin():
    getCPName()
    if CP_NAME != 'DirectAdmin':
        return False

    try:
        with open('/usr/local/directadmin/conf/directadmin.conf', encoding='utf-8') as f:
            out = f.read()
        return out.split('admindir=')[1].split('\n')[0].split('/')[-1].strip()
    except Exception:
        return 'admin'


# Detect CloudLinux instalation process
def check_CL_installing():
    if not os.path.isfile(CL_SETUP_LOCK_FILE):
        return False

    try:
        with open(CL_SETUP_LOCK_FILE, encoding='utf-8') as f:
            pid = int(f.read())
        return os.path.isdir(f'/proc/{pid}')
    except Exception:
        return False


# Detect Nagios
def get_nagios():
    if not os.path.isdir('/usr/local/nagios'):
        return False

    global NAGIOS_GID
    try:
        NAGIOS_GID = pwd.getpwnam('nagios').pw_gid
        return True
    except Exception:
        return False


# Detect if cloudlinux=yes is present for DirectAdmin
def da_check_options():
    check_result = get_param_from_file('/usr/local/directadmin/custombuild/options.conf', 'cloudlinux', '=')
    return check_result == 'yes'


def get_symlinksifowner():
    """get fs.enforce_symlinksifowner from sysctl conf"""
    sysctl = SysCtlConf(config_file=SYSCTL_CL_CONF_FILE, mute_errors=False)
    value = sysctl.get('fs.enforce_symlinksifowner')
    return int(value) if value is not None else value


# Get suEXEC status
def get_suEXEC_status():
    global SUEXEC_ENABLED
    if SUEXEC_ENABLED is None:
        detect_suEXEC_suPHP()
    return SUEXEC_ENABLED


# Get suPHP status():
def get_suPHP_status():
    global SUPHP_ENABLED
    if SUPHP_ENABLED is None:
        detect_suEXEC_suPHP()
    return SUPHP_ENABLED


# Detect suEXEC  and suPHP
def detect_suEXEC_suPHP():
    global SUEXEC_ENABLED
    global SUPHP_ENABLED

    # This helps us to avoid double check when we checks both suEXEC and suPHP
    SUEXEC_ENABLED = False
    SUPHP_ENABLED = False

    modules = get_apache_modules()
    if modules is None:
        return
    SUEXEC_ENABLED = 'suexec_module' in modules
    SUPHP_ENABLED = 'suphp_module' in modules


def get_apache_modules():
    #  path to httpd is the same on the panels
    bin_exec = "/usr/sbin/httpd"
    try:
        with subprocess.Popen(
            [bin_exec, '-M'],
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True,
        ) as proc:
            out, _ = proc.communicate()
        modules = []
        out = out.split('\n')
        #  clean the output from 1st line 'Loaded modules'
        for line in out[1:]:
            if not line:
                continue
            # core_module (static) so_module (static) http_module (static) mpm_worker_module (shared)...
            #  --> ['core_module', 'so_module', 'http_module', 'mpm_worker_module']
            try:
                mod = line.strip().split(' ')[0]
            except IndexError:
                mod = ''
            if mod == '':
                continue
            modules.append(mod)
        return modules
    except (OSError, IOError):
        return None


def execute(command):
    """
    Executes command with bash interpreter
    """
    with subprocess.Popen(
        command,
        shell=True,
        executable='/bin/bash',
        stdout=subprocess.PIPE,
        text=True,
        bufsize=-1
    ) as proc:
        return proc.communicate()[0]


# check suPHP or suEXEC binary for jail
def check_binary_has_jail(location):
    try:
        if is_ea4():
            result = execute('/usr/bin/strings ' + str(location[getCPName() + '_ea4']) + ' | grep jail')
        else:
            result = execute('/usr/bin/strings ' + str(location[getCPName()]) + ' | grep jail')

        return result.find('jail error') != -1
    except KeyError:
        return None
    except (IOError, OSError):
        return False


# Check sshd -T output for usepam yes
def check_SSHd_UsePAM():
    try:
        result = execute('/usr/sbin/sshd -T | grep usepam')
        return result.find('usepam yes') != -1
    except (IOError, OSError):
        return None


def init_cp_name():
    if CP_NAME is None:
        getCPName()

# NOTE: This section of code is deprecated and should not be added to.

# Detect DirectAdmin machine
def is_da():
    init_cp_name()
    return CP_NAME == 'DirectAdmin'


# Detect ISP Manager machine
def is_ispmanager():
    init_cp_name()
    return CP_NAME == 'ISPManager'


# Detect ISP Manager v5 machine type: "Master" or "Node"
# If not ISP5 - always None
def ispmanager5_type():
    init_cp_name()
    return CP_ISP_TYPE


# Detect ISP Manager v5 machine is Master
def ispmanager5_is_master():
    return CP_ISP_TYPE == "Master"


# Detect cPanel machine
def is_cpanel():
    init_cp_name()
    return CP_NAME == 'cPanel'


# Detect Plesk machine
def is_plesk():
    init_cp_name()
    return CP_NAME == 'Plesk'


# Detect InterWorx machine
def is_internetworx():
    init_cp_name()
    return CP_NAME == 'InterWorx'


# Detect H-Sphere machine
def is_hsphere():
    init_cp_name()
    return CP_NAME == 'H-Sphere'


# Detect HostingNG machine
def is_hostingng():
    init_cp_name()
    return CP_NAME == 'HostingNG'


# Detect unknown machine
def is_unknown():
    init_cp_name()
    return CP_NAME == 'Unknown'


def is_openvz():
    """
    Returns 0 if there is no openvz, otherwise returns node id
    """
    pid = os.getpid()
    with open(f'/proc/{pid}/status', encoding='utf-8') as f:
        for line in f:
            if line.startswith('envID:'):
                env_id = line.split(':')[1].strip()
                return int(env_id)
    return 0  # no openvz found


def is_cagefs_installed():
    return os.path.exists('/usr/sbin/cagefsctl')


def get_boolean_param(file_name, param_name, separator='=', default_val=True):
    config_val = get_param_from_file(file_name, param_name, separator, default_val=None)
    if config_val is None:
        return default_val
    return config_val.lower() in ('true', '1', 'yes', 'on')