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Edit File : cl_proc_hidepid.py \| Size : 4.53 KB
# -- coding: utf-8 -- # 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 # Module contains functions for remounting /proc with hidepid=2 option # see CAG-796 for details import subprocess import re from clcommon.cpapi import Feature, is_panel_feature_supported from clcommon.sysctl import SysCtlConf, SYSCTL_CL_CONF_FILE from clcommon.utils import grep, proc_can_see_other_uid_and_hidepid_synced # on some systems hidepid value is str HidepidValuesDict = { 'noaccess': 1, 'invisible': 2, '1': 1, '2': 2, } def hidepid_found(): """ Search for line like "proc /proc proc defaults,hidepid=2,gid=clsupergid 0 0" in /etc/fstab Return True if /proc is mounted with hidepid option in /etc/fstab """ fstab = '/etc/fstab' try: with open(fstab, 'r', encoding='utf-8') as f: for line in f: line = line.strip() if line and not line.startswith('#'): splitted_line = line.split() if splitted_line and splitted_line[0] == 'proc' and 'hidepid=' in splitted_line[3]: return True except (IOError, IndexError) as e: print('Error: failed to parse', fstab, ':', str(e)) return False def execute(cmd, verbose): if verbose: print('executing', ' '.join(cmd)) return subprocess.call(cmd) def remount_proc(verbose=False): """ Remount /proc with hidepid=2 option when needed """ # In latest versions of the kernel on CL8 # no need to remount /proc with hidepid option # because it is synchronized with fs.proc_can_see_other_uid option if proc_can_see_other_uid_and_hidepid_synced(): return if not is_panel_feature_supported(Feature.LVE): if verbose: print('environment without LVE detected - remounting /proc is skipped') return sysctl = SysCtlConf(config_file=SYSCTL_CL_CONF_FILE) if verbose: print('apply sysctl settings') if hidepid_found(): # admin can override hidepid option via /etc/fstab if verbose: print('hidepid option is found in /etc/fstab - remounting /proc with options from /etc/fstab') return execute(['/bin/mount', '-o', 'remount', '/proc'], verbose) proc_can_see_other_uid = sysctl.get('fs.proc_can_see_other_uid') super_gid = sysctl.get('fs.proc_super_gid') if proc_can_see_other_uid != '0': if verbose: print('virtualized procfs feature is not enabled in sysctl conf - disable hidepid') return execute(['/bin/mount', '-o', 'remount,hidepid=0,gid=0', '/proc'], verbose) if verbose: print('enable hidepid for /proc') return execute(['/bin/mount', '-o', 'remount,hidepid=2,gid=' + super_gid, '/proc'], verbose) def get_gid_from_mounts(): """ Retrieve hidepid gid from /proc/mounts :return: gid, 0 if absent """ lines_gen = grep(',hidepid=', '/proc/mounts') gid_prefix = ',gid=' try: for line in lines_gen: line = line.strip() if gid_prefix not in line: continue # Search gid=xxxx in line pos = line.find(gid_prefix) if pos == -1: continue pos += 5 line = line[pos:] pos = line.find(',') if pos != -1: line = line[:pos] else: pos = line.find(' ') if pos != -1: line = line[:pos] else: # Invalid or unsupported proc format return -1 return int(line) except (IOError, IndexError, ValueError): pass # hidepid not found in /proc/mounts return -1 def get_hidepid_typing_from_mounts() -> int: """ Retrieve hidepid value from /proc/mounts :return: hidepid, 0 if absent """ mounts_path = '/proc/mounts' res = 0 try: # Parse mounts file output for proc lines and get the hidepid with open(mounts_path, mode='r', encoding='utf-8') as file: for line in file: m = re.search(r'hidepid=(\d\|\w+)', line) if not line.strip().startswith('proc /proc'): continue if m: res = HidepidValuesDict.get(str(m.group(1)), 0) break except (OSError, IOError, IndexError, ValueError): pass # hidepid not found in /proc/mounts return res Back

Edit File : cl_proc_hidepid.py | Size : 4.53 KB

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

# 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
# Module contains functions for remounting /proc with hidepid=2 option
# see CAG-796 for details

import subprocess
import re

from clcommon.cpapi import Feature, is_panel_feature_supported
from clcommon.sysctl import SysCtlConf, SYSCTL_CL_CONF_FILE
from clcommon.utils import grep, proc_can_see_other_uid_and_hidepid_synced

# on some systems hidepid value is str
HidepidValuesDict = {
    'noaccess': 1,
    'invisible': 2,
    '1': 1,
    '2': 2,
}

def hidepid_found():
    """
    Search for line like "proc /proc proc defaults,hidepid=2,gid=clsupergid 0 0" in /etc/fstab
    Return True if /proc is mounted with hidepid option in /etc/fstab
    """
    fstab = '/etc/fstab'
    try:
        with open(fstab, 'r', encoding='utf-8') as f:
            for line in f:
                line = line.strip()
                if line and not line.startswith('#'):
                    splitted_line = line.split()
                    if splitted_line and splitted_line[0] == 'proc' and 'hidepid=' in splitted_line[3]:
                        return True
    except (IOError, IndexError) as e:
        print('Error: failed to parse', fstab, ':', str(e))
    return False

def execute(cmd, verbose):
    if verbose:
        print('executing', ' '.join(cmd))
    return subprocess.call(cmd)

def remount_proc(verbose=False):
    """
    Remount /proc with hidepid=2 option when needed
    """
    # In latest versions of the kernel on CL8
    # no need to remount /proc with hidepid option
    # because it is synchronized with fs.proc_can_see_other_uid option
    if proc_can_see_other_uid_and_hidepid_synced():
        return
    if not is_panel_feature_supported(Feature.LVE):
        if verbose:
            print('environment without LVE detected - remounting /proc is skipped')
        return
    sysctl = SysCtlConf(config_file=SYSCTL_CL_CONF_FILE)
    if verbose:
        print('apply sysctl settings')
    if hidepid_found():
        # admin can override hidepid option via /etc/fstab
        if verbose:
            print('hidepid option is found in /etc/fstab - remounting /proc with options from /etc/fstab')
        return execute(['/bin/mount', '-o', 'remount', '/proc'], verbose)
    proc_can_see_other_uid = sysctl.get('fs.proc_can_see_other_uid')
    super_gid = sysctl.get('fs.proc_super_gid')
    if proc_can_see_other_uid != '0':
        if verbose:
            print('virtualized procfs feature is not enabled in sysctl conf - disable hidepid')
        return execute(['/bin/mount', '-o', 'remount,hidepid=0,gid=0', '/proc'], verbose)
    if verbose:
        print('enable hidepid for /proc')
    return execute(['/bin/mount', '-o', 'remount,hidepid=2,gid=' + super_gid, '/proc'], verbose)

def get_gid_from_mounts():
    """
    Retrieve hidepid gid from /proc/mounts
    :return: gid, 0 if absent
    """
    lines_gen = grep(',hidepid=', '/proc/mounts')
    gid_prefix = ',gid='
    try:
        for line in lines_gen:
            line = line.strip()
            if gid_prefix not in line:
                continue
            # Search gid=xxxx in line
            pos = line.find(gid_prefix)
            if pos == -1:
                continue
            pos += 5
            line = line[pos:]
            pos = line.find(',')
            if pos != -1:
                line = line[:pos]
            else:
                pos = line.find(' ')
                if pos != -1:
                    line = line[:pos]
                else:
                    # Invalid or unsupported proc format
                    return -1
            return int(line)
    except (IOError, IndexError, ValueError):
        pass
    # hidepid not found in /proc/mounts
    return -1

def get_hidepid_typing_from_mounts() -> int:
    """
    Retrieve hidepid value from /proc/mounts
    :return: hidepid, 0 if absent
    """
    mounts_path = '/proc/mounts'
    res = 0
    try:
        # Parse mounts file output for proc lines and get the hidepid
        with open(mounts_path, mode='r', encoding='utf-8') as file:
            for line in file:
                m = re.search(r'hidepid=(\d|\w+)', line)
                if not line.strip().startswith('proc /proc'):
                    continue
                if m:
                    res = HidepidValuesDict.get(str(m.group(1)), 0)
                    break
    except (OSError, IOError, IndexError, ValueError):
        pass
    # hidepid not found in /proc/mounts
    return res

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