Module: Msf::Post::Linux::System

Includes:
Common, File, Unix
Defined in:
lib/msf/core/post/linux/system.rb

Instance Method Summary collapse

Methods included from Unix

#enum_user_directories, #get_groups, #get_session_pid, #get_users, #is_root?, #whoami

Methods included from File

#_append_file_powershell, #_append_file_unix_shell, #_can_echo?, #_read_file_meterpreter, #_read_file_powershell, #_read_file_powershell_fragment, #_shell_command_with_success_code, #_unix_max_line_length, #_win_ansi_append_file, #_win_ansi_write_file, #_win_bin_append_file, #_win_bin_write_file, #_write_file_meterpreter, #_write_file_powershell, #_write_file_powershell_fragment, #_write_file_unix_shell, #append_file, #attributes, #cd, #chmod, #copy_file, #dir, #directory?, #executable?, #exist?, #expand_path, #exploit_data, #exploit_source, #file?, #file_local_write, #file_remote_digestmd5, #file_remote_digestsha1, #file_remote_digestsha2, #immutable?, #initialize, #mkdir, #pwd, #read_file, #readable?, #rename_file, #rm_f, #rm_rf, #setuid?, #stat, #upload_and_chmodx, #upload_file, #writable?, #write_file

Methods included from Common

#clear_screen, #cmd_exec, #cmd_exec_get_pid, #cmd_exec_with_result, #command_exists?, #get_env, #get_envs, #initialize, #peer, #report_virtualization, #rhost, #rport

Instance Method Details

#get_container_type ⇒ String

Determine if system is a container

Returns:

  • (String) 


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# File 'lib/msf/core/post/linux/system.rb', line 395

def get_container_type
  # Checking file paths for solution
  container_type =
    if file?('/.dockerenv') || file?('/.dockerinit')
      'Docker'
    elsif file?('/run/.containerenv')
      'Podman'
    elsif directory?('/dev/lxc')
      'LXC'
    elsif file?('/proc/sys/kernel/osrelease') && read_file('/proc/sys/kernel/osrelease').grep(/WSL|Microsoft/i).any?
      # Check for WSL, as suggested in https://github.com/Microsoft/WSL/issues/423#issuecomment-221627364
      'WSL'
    elsif (cgroup = read_file('/proc/1/cgroup'))
      # Check cgroup on PID 1
      case cgroup.tr("\n", ' ')
      when /docker/i
        return 'Docker'
      when /lxc/i
        return 'LXC'
      end
    else
      # Check for the "container" environment variable
      case get_env('container')
      when 'lxc'
        return 'LXC'
      when 'systemd-nspawn'
        return 'systemd nspawn'
      when 'podman'
        return 'Podman'
      else
        'Unknown'
      end
    end
  unless container_type == 'Unknown'
    report_host({
      host: rhost,
      virtual_host: container_type
    })
  end
  container_type
end

#get_cpu_info ⇒ Hash

Gets basic information about the system’s CPU.

Returns:

  • (Hash) 


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# File 'lib/msf/core/post/linux/system.rb', line 156

def get_cpu_info
  info = {}
  orig = read_file('/proc/cpuinfo').to_s
  cpuinfo = orig.split("\n\n")[0]
  # This is probably a more platform independent way to parse the results (compared to splitting and assigning preset indices to values)
  cpuinfo.split("\n").each do |l|
    info[:speed_mhz] = l.split(': ')[1].to_i if l.include? 'cpu MHz'
    info[:product] = l.split(': ')[1] if l.include? 'model name'
    info[:vendor] = l.split(': ')[1] if l.include? 'vendor_id'
  end
  info[:cores] = orig.split("\n\n").size
  info
rescue StandardError
  raise 'Could not get CPU information'
end

#get_hostname ⇒ String

Gets the hostname of the system

Returns:

  • (String) 


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# File 'lib/msf/core/post/linux/system.rb', line 176

def get_hostname
  hostname =
    if command_exists?('uname')
      cmd_exec('uname -n').to_s
    else
      read_file('/proc/sys/kernel/hostname').to_s.chomp
    end
  report_host({ host: rhost, name: hostname })
  hostname
rescue StandardError
  raise 'Unable to retrieve hostname'
end

#get_mount_path(filepath) ⇒ String

Gets the mount point of ‘filepath`

Parameters:

  • filepath (String) —

    The filepath to get the mount point

Returns:

  • (String) 


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# File 'lib/msf/core/post/linux/system.rb', line 288

def get_mount_path(filepath)
  cmd_exec("df \"#{filepath}\" | tail -1").split(' ')[5]
rescue StandardError
  raise "Unable to get mount path of #{filepath}"
end

#get_path ⇒ String

Gets the $PATH environment variable

Returns:

  • (String) 


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# File 'lib/msf/core/post/linux/system.rb', line 146

def get_path
  cmd_exec('echo $PATH').to_s
rescue StandardError
  raise 'Unable to determine path'
end

#get_shell_name ⇒ String

Gets the name of the current shell

Returns:

  • (String) 


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# File 'lib/msf/core/post/linux/system.rb', line 193

def get_shell_name
  if command_exists?('ps')
    cmd_exec('ps -p $$').to_s.split("\n").last.split(' ')[3]
  else
    cmd_exec('echo $0').split('-')[1]
  end
rescue StandardError
  raise 'Unable to gather shell name'
end

#get_shell_pid ⇒ String

Gets the pid of the current shell

Returns:

  • (String) 


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# File 'lib/msf/core/post/linux/system.rb', line 207

def get_shell_pid
  cmd_exec('echo $$').to_s
end

#get_suid_files(findpath = '/') ⇒ Array

Gathers all SUID files on the filesystem. NOTE: This uses the Linux ‘find` command. It will most likely take a while to get all files. Consider specifying a more narrow find path.

Parameters:

  • findpath (defaults to: '/') —

    The path on the system to start searching

Returns:

  • (Array) 


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# File 'lib/msf/core/post/linux/system.rb', line 137

def get_suid_files(findpath = '/')
  cmd_exec("find #{findpath} -perm -4000 -print -xdev").to_s.split("\n").delete_if { |i| i.include? 'Permission denied' }
rescue StandardError
  raise 'Could not retrieve all SUID files'
end

#get_sysinfo ⇒ Object

Returns a Hash containing Distribution Name, Version and Kernel Information



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# File 'lib/msf/core/post/linux/system.rb', line 14

def get_sysinfo
  system_data = {}
  etc_files = cmd_exec('ls /etc').split

  kernel_version = cmd_exec('uname -a')
  system_data[:kernel] = kernel_version

  # Debian
  if etc_files.include?('debian_version')
    version = read_file('/etc/issue').gsub(/\n|\\n|\\l/, '').strip
    if kernel_version =~ /Ubuntu/
      system_data[:distro] = 'ubuntu'
    else
      system_data[:distro] = 'debian'
    end
    system_data[:version] = version

  # Amazon / CentOS
  elsif etc_files.include?('system-release')
    version = read_file('/etc/system-release').gsub(/\n|\\n|\\l/, '').strip
    if version.include? 'CentOS'
      system_data[:distro] = 'centos'
    elsif version.include? 'Fedora'
      system_data[:distro] = 'fedora'
    else
      system_data[:distro] = 'amazon'
    end
    system_data[:version] = version

  # Alpine
  elsif etc_files.include?('alpine-release')
    version = read_file('/etc/alpine-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'alpine'
    system_data[:version] = version

  # Fedora
  elsif etc_files.include?('fedora-release')
    version = read_file('/etc/fedora-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'fedora'
    system_data[:version] = version

  # Oracle Linux
  elsif etc_files.include?('enterprise-release')
    version = read_file('/etc/enterprise-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'oracle'
    system_data[:version] = version

  # RedHat
  elsif etc_files.include?('redhat-release')
    version = read_file('/etc/redhat-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'redhat'
    system_data[:version] = version

  # Arch
  elsif etc_files.include?('arch-release')
    version = read_file('/etc/arch-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'arch'
    system_data[:version] = version

  # Slackware
  elsif etc_files.include?('slackware-version')
    version = read_file('/etc/slackware-version').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'slackware'
    system_data[:version] = version

  # Mandrake
  elsif etc_files.include?('mandrake-release')
    version = read_file('/etc/mandrake-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'mandrake'
    system_data[:version] = version

  # SuSE
  elsif etc_files.include?('SuSE-release')
    version = read_file('/etc/SuSE-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'suse'
    system_data[:version] = version

  # OpenSUSE
  elsif etc_files.include?('SUSE-brand')
    version = read_file('/etc/SUSE-brand').scan(/^VERSION\s*=\s*([\d.]+)/).flatten.first
    system_data[:distro] = 'suse'
    system_data[:version] = version

  # Gentoo
  elsif etc_files.include?('gentoo-release')
    version = read_file('/etc/gentoo-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'gentoo'
    system_data[:version] = version

  # Openwall
  elsif etc_files.include?('owl-release')
    version = read_file('/etc/owl-release').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'openwall'
    system_data[:version] = version

  # Generic
  elsif etc_files.include?('issue')
    version = read_file('/etc/issue').gsub(/\n|\\n|\\l/, '').strip
    system_data[:distro] = 'linux'
    system_data[:version] = version

  # Others, could be a mismatch like ssh_login to cisco device
  else
    system_data[:distro] = 'linux'
    system_data[:version] = ''

  end

  report_host({
    host: rhost,
    os_name: system_data[:distro],
    os_flavor: system_data[:version]
  })

  system_data
end

#glibc_version ⇒ String

Gets the version of glibc

Returns:

  • (String) 


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# File 'lib/msf/core/post/linux/system.rb', line 275

def glibc_version
  raise 'glibc is not installed' unless command_exists? 'ldd'

  cmd_exec('ldd --version').scan(/^ldd\s+\(.*\)\s+([\d.]+)/).flatten.first
rescue StandardError
  raise 'Could not determine glibc version'
end

#has_gcc? ⇒ Boolean

Checks if the system has gcc installed

Returns:

  • (Boolean) 


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# File 'lib/msf/core/post/linux/system.rb', line 215

def has_gcc?
  command_exists? 'gcc'
rescue StandardError
  raise 'Unable to check for gcc'
end

#interfaces ⇒ Array

Gets all the interfaces of the device

Returns:

  • (Array) 


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# File 'lib/msf/core/post/linux/system.rb', line 318

def interfaces
  result = []
  data = cmd_exec('for fn in /sys/class/net/*; do echo $fn; done')
  parts = data.split("\n")
  parts.each do |line|
    line = line.split('/')[-1]
    result.insert(-1, line)
  end
  result
end

#ips ⇒ Array

Gets all the IP directions of the device

Returns:

  • (Array) 


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# File 'lib/msf/core/post/linux/system.rb', line 298

def ips
  lines = read_file('/proc/net/fib_trie')
  result = []
  previous_line = ''
  lines.each_line do |line|
    if line.include?('/32 host LOCAL')
      previous_line = previous_line.split('-- ')[1].strip
      unless result.include? previous_line
        result.insert(-1, previous_line)
      end
    end
    previous_line = line
  end
  result
end

#listen_tcp_ports ⇒ Array

Parsing information based on: github.com/sensu-plugins/sensu-plugins-network-checks/blob/master/bin/check-netstat-tcp.rb

Gets all the listening tcp ports in the device

Returns:

  • (Array) 


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# File 'lib/msf/core/post/linux/system.rb', line 352

def listen_tcp_ports
  ports = []
  content = read_file('/proc/net/tcp')
  content.each_line do |line|
    next unless (m = line.match(/^\s*\d+:\s+(.{8}|.{32}):(.{4})\s+(.{8}|.{32}):(.{4})\s+(.{2})/))

    connection_state = m[5].to_s
    next unless connection_state == '0A'

    connection_port = m[2].to_i(16)
    unless ports.include?(connection_port)
      ports.insert(-1, connection_port)
    end
  end
  ports
end

#listen_udp_ports ⇒ Array

Parsing information based on: github.com/sensu-plugins/sensu-plugins-network-checks/blob/master/bin/check-netstat-tcp.rb

Gets all the listening udp ports in the device

Returns:

  • (Array) 


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# File 'lib/msf/core/post/linux/system.rb', line 374

def listen_udp_ports
  ports = []
  content = read_file('/proc/net/udp')
  content.each_line do |line|
    next unless (m = line.match(/^\s*\d+:\s+(.{8}|.{32}):(.{4})\s+(.{8}|.{32}):(.{4})\s+(.{2})/))

    connection_state = m[5].to_s
    next unless connection_state == '07'

    connection_port = m[2].to_i(16)
    if ports.include?(connection_port) == false
      ports.insert(-1, connection_port)
    end
  end
  return ports
end

#macs ⇒ Array

Gets all the macs of the device

Returns:

  • (Array) 


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# File 'lib/msf/core/post/linux/system.rb', line 333

def macs
  result = []
  str_macs = cmd_exec('for fn in /sys/class/net/*; do echo $fn; done')
  parts = str_macs.split("\n")
  parts.each do |line|
    rut = line + '/address'
    mac_array = read_file(rut)
    mac_array.each_line do |mac|
      result.insert(-1, mac.strip)
    end
  end
  result
end

#noexec?(file_path) ⇒ Boolean

Checks if ‘file_path` is mounted on a noexec mount point

Returns:

  • (Boolean) 


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# File 'lib/msf/core/post/linux/system.rb', line 225

def noexec?(file_path)
  mount = read_file('/proc/mounts').to_s
  mount_path = get_mount_path(file_path)
  mount.lines.each do |l|
    return true if l =~ Regexp.new("#{mount_path} (.*)noexec(.*)")
  end
  false
rescue StandardError
  raise 'Unable to check for noexec volume'
end

#nosuid?(file_path) ⇒ Boolean

Checks if ‘file_path` is mounted on a nosuid mount point

Returns:

  • (Boolean) 


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# File 'lib/msf/core/post/linux/system.rb', line 240

def nosuid?(file_path)
  mount = read_file('/proc/mounts').to_s
  mount_path = get_mount_path(file_path)
  mount.lines.each do |l|
    return true if l =~ Regexp.new("#{mount_path} (.*)nosuid(.*)")
  end
  false
rescue StandardError
  raise 'Unable to check for nosuid volume'
end

#protected_hardlinks? ⇒ Boolean

Checks for protected hardlinks on the system

Returns:

  • (Boolean) 


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# File 'lib/msf/core/post/linux/system.rb', line 255

def protected_hardlinks?
  read_file('/proc/sys/fs/protected_hardlinks').to_s.strip.eql? '1'
rescue StandardError
  raise 'Could not determine protected_hardlinks status'
end

#protected_symlinks? ⇒ Boolean

Checks for protected symlinks on the system

Returns:

  • (Boolean) 


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# File 'lib/msf/core/post/linux/system.rb', line 265

def protected_symlinks?
  read_file('/proc/sys/fs/protected_symlinks').to_s.strip.eql? '1'
rescue StandardError
  raise 'Could not determine protected_symlinks status'
end