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# -*- coding: binary -*-
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require 'rex/post/file'
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require 'rex/post/meterpreter/channel'
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require 'rex/post/meterpreter/channels/pools/file'
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require 'rex/post/meterpreter/extensions/stdapi/stdapi'
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require 'rex/post/meterpreter/extensions/stdapi/fs/io'
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require 'rex/post/meterpreter/extensions/stdapi/fs/file_stat'
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require 'fileutils'
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require 'filesize'
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module Rex
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module Post
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module Meterpreter
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module Extensions
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module Stdapi
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module Fs
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###
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#
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# This class implements the Rex::Post::File interface and wraps interaction
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# with files on the remote machine.
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#
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###
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class File < Rex::Post::Meterpreter::Extensions::Stdapi::Fs::IO
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  include Rex::Post::File
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  MIN_BLOCK_SIZE = 1024
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  class << self
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    attr_accessor :client
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  end
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  #
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  # Return the directory separator, i.e.: "/" on unix, "\\" on windows
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  #
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  def File.separator()
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    # The separator won't change, so cache it to prevent sending
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    # unnecessary requests.
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    return @separator if @separator
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    request = Packet.create_request(COMMAND_ID_STDAPI_FS_SEPARATOR)
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    # Fall back to the old behavior of always assuming windows.  This
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    # allows meterpreter executables built before the addition of this
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    # command to continue functioning.
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    begin
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      response = client.send_request(request)
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      @separator = response.get_tlv_value(TLV_TYPE_STRING)
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    rescue RequestError
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      @separator = "\\"
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    end
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    return @separator
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  end
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  class << self
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    alias :Separator :separator
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    alias :SEPARATOR :separator
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  end
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  #
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  # Search for files matching +glob+ starting in directory +root+.
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  #
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  # Returns an Array (possibly empty) of Hashes. Each element has the following
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  # keys:
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  # 'path'::  The directory in which the file was found
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  # 'name'::  File name
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  # 'size'::  Size of the file, in bytes
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  #
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  # Example:
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  #    client.fs.file.search(client.fs.dir.pwd, "*.txt")
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  #    # => [{"path"=>"C:\\Documents and Settings\\user\\Desktop", "name"=>"foo.txt", "size"=>0}]
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  #
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  # Raises a RequestError if +root+ is not a directory.
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  #
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  def File.search( root=nil, glob="*.*", recurse=true, timeout=-1, modified_start_date=nil, modified_end_date=nil)
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    files = ::Array.new
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    request = Packet.create_request( COMMAND_ID_STDAPI_FS_SEARCH )
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    root = client.unicode_filter_decode(root) if root
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    root = root.chomp( self.separator ) if root && !root.eql?('/')
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    request.add_tlv( TLV_TYPE_SEARCH_ROOT, root )
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    request.add_tlv( TLV_TYPE_SEARCH_GLOB, glob )
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    request.add_tlv( TLV_TYPE_SEARCH_RECURSE, recurse )
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    request.add_tlv( TLV_TYPE_SEARCH_M_START_DATE, modified_start_date) if modified_start_date
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    request.add_tlv( TLV_TYPE_SEARCH_M_END_DATE, modified_end_date) if modified_end_date
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    # we set the response timeout to -1 to wait indefinitely as a
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    # search could take an indeterminate amount of time to complete.
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    response = client.send_request( request, timeout )
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    if( response.result == 0 )
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      response.each( TLV_TYPE_SEARCH_RESULTS ) do | results |
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        files << {
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          'path' => client.unicode_filter_encode(results.get_tlv_value(TLV_TYPE_FILE_PATH).chomp( self.separator )),
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          'name' => client.unicode_filter_encode(results.get_tlv_value(TLV_TYPE_FILE_NAME)),
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          'size' => results.get_tlv_value(TLV_TYPE_FILE_SIZE),
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          'mtime'=> results.get_tlv_value(TLV_TYPE_SEARCH_MTIME)
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        }
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      end
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    end
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    return files
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  end
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  #
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  # Returns the base name of the supplied file path to the caller.
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  #
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  def File.basename(*a)
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    path = a[0]
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    # Allow both kinds of dir serparators since lots and lots of code
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    # assumes one or the other so this ends up getting called with strings
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    # like: "C:\\foo/bar"
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    path =~ %r#.*[/\\](.*)$#
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    Rex::FileUtils.clean_path($1 || path)
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  end
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  #
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  # Expands a file path, substituting all environment variables, such as
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  # %TEMP% on Windows or $HOME on Unix
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  #
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  # Examples:
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  #    client.fs.file.expand_path("%appdata%")
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  #    # => "C:\\Documents and Settings\\user\\Application Data"
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  #    client.fs.file.expand_path("~")
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  #    # => "/home/user"
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  #    client.fs.file.expand_path("$HOME/dir")
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  #    # => "/home/user/dir"
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  #    client.fs.file.expand_path("asdf")
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  #    # => "asdf"
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  #
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  def File.expand_path(path)
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    case client.platform
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      when 'osx', 'freebsd', 'bsd', 'linux', 'android', 'apple_ios'
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        # For unix-based systems, do some of the work here
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        # First check for ~
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        path_components = path.split(separator)
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        if path_components.length > 0 && path_components[0] == '~'
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          path = "$HOME#{path[1..-1]}"
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        end
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        # Now find the environment variables we'll need from the client
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        env_regex = /\$(?:([A-Za-z0-9_]+)|\{([A-Za-z0-9_]+)\})/
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        matches = path.to_enum(:scan, env_regex).map { Regexp.last_match }
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        env_vars = matches.map { |match| (match[1] || match[2]).to_s }.uniq
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        # Retrieve them
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        env_vals = client.sys.config.getenvs(*env_vars)
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        # Now fill them in
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        path.gsub(env_regex) { |_z| envvar = $1; envvar = $2 if envvar == nil; env_vals[envvar] }
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      else
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        request = Packet.create_request(COMMAND_ID_STDAPI_FS_FILE_EXPAND_PATH)
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        request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( path ))
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        response = client.send_request(request)
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        return client.unicode_filter_encode(response.get_tlv_value(TLV_TYPE_FILE_PATH))
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    end
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  end
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  #
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  # Calculates the MD5 (16-bytes raw) of a remote file
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  #
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  def File.md5(path)
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    request = Packet.create_request(COMMAND_ID_STDAPI_FS_MD5)
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    request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( path ))
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    response = client.send_request(request)
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    # older meterpreter binaries will send FILE_NAME containing the hash
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    hash = response.get_tlv_value(TLV_TYPE_FILE_HASH) ||
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      response.get_tlv_value(TLV_TYPE_FILE_NAME)
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    return hash
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  end
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  #
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  # Calculates the SHA1 (20-bytes raw) of a remote file
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  #
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  def File.sha1(path)
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    request = Packet.create_request(COMMAND_ID_STDAPI_FS_SHA1)
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    request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( path ))
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    response = client.send_request(request)
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    # older meterpreter binaries will send FILE_NAME containing the hash
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    hash = response.get_tlv_value(TLV_TYPE_FILE_HASH) ||
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      response.get_tlv_value(TLV_TYPE_FILE_NAME)
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    return hash
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  end
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  #
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  # Performs a stat on a file and returns a FileStat instance.
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  #
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  def File.stat(name)
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    return client.fs.filestat.new( name )
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  end
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  #
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  # Returns true if the remote file +name+ exists, false otherwise
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  #
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  def File.exist?(name)
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    r = client.fs.filestat.new(name) rescue nil
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    r ? true : false
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  end
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  #
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  # Performs a delete on the remote file +name+
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  #
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  def File.rm(name)
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    request = Packet.create_request(COMMAND_ID_STDAPI_FS_DELETE_FILE)
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    request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( name ))
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    response = client.send_request(request)
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    return response
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  end
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  class << self
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    alias unlink rm
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    alias delete rm
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  end
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  #
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  # Performs a rename from oldname to newname
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  #
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  def File.mv(oldname, newname)
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    request = Packet.create_request(COMMAND_ID_STDAPI_FS_FILE_MOVE)
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    request.add_tlv(TLV_TYPE_FILE_NAME, client.unicode_filter_decode( oldname ))
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    request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( newname ))
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244
    response = client.send_request(request)
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    return response
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  end
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249
  class << self
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    alias move mv
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    alias rename mv
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  end
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254
  #
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  # Performs a copy from oldname to newname
256
  #
257
  def File.cp(oldname, newname)
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    request = Packet.create_request(COMMAND_ID_STDAPI_FS_FILE_COPY)
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260
    request.add_tlv(TLV_TYPE_FILE_NAME, client.unicode_filter_decode( oldname ))
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    request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( newname ))
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263
    response = client.send_request(request)
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265
    return response
266
  end
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268
  class << self
269
    alias copy cp
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  end
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272
  #
273
  # Performs a chmod on the remote file
274
  #
275
  def File.chmod(name, mode)
276
    request = Packet.create_request(COMMAND_ID_STDAPI_FS_CHMOD)
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278
    request.add_tlv(TLV_TYPE_FILE_PATH, client.unicode_filter_decode( name ))
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    request.add_tlv(TLV_TYPE_FILE_MODE_T, mode)
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281
    response = client.send_request(request)
282

283
    return response
284
  end
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286
  #
287
  # Upload one or more files to the remote remote directory supplied in
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  # +destination+.
289
  #
290
  # If a block is given, it will be called before each file is uploaded and
291
  # again when each upload is complete.
292
  #
293
  def File.upload(dest, *src_files, &stat)
294
    src_files.each { |src|
295
      if (self.basename(dest) != ::File.basename(src))
296
        dest += self.separator unless dest.end_with?(self.separator)
297
        dest += ::File.basename(src)
298
      end
299
      stat.call('Uploading', src, dest) if (stat)
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301
      upload_file(dest, src)
302
      stat.call('Completed', src, dest) if (stat)
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    }
304
  end
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306
  #
307
  # Upload a single file.
308
  #
309
  def File.upload_file(dest_file, src_file, &stat)
310
    # Open the file on the remote side for writing and read
311
    # all of the contents of the local file
312
    stat.call('Uploading', src_file, dest_file) if stat
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    dest_fd = nil
314
    src_fd = nil
315
    buf_size = 8 * 1024 * 1024
316

317
    begin
318
      dest_fd = client.fs.file.new(dest_file, "wb")
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      src_fd = ::File.open(src_file, "rb")
320
      src_size = src_fd.stat.size
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      while (buf = src_fd.read(buf_size))
322
        dest_fd.write(buf)
323
        percent = dest_fd.pos.to_f / src_size.to_f * 100.0
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        msg = "Uploaded #{Filesize.new(dest_fd.pos).pretty} of " \
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          "#{Filesize.new(src_size).pretty} (#{percent.round(2)}%)"
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        stat.call(msg, src_file, dest_file) if stat
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      end
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    ensure
329
      src_fd.close unless src_fd.nil?
330
      dest_fd.close unless dest_fd.nil?
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    end
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    stat.call('Completed', src_file, dest_file) if stat
333
  end
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335
  def File.is_glob?(name)
336
    /\*|\[|\?/ === name
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  end
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339
  #
340
  # Download one or more files from the remote computer to the local
341
  # directory supplied in destination.
342
  #
343
  # If a block is given, it will be called before each file is downloaded and
344
  # again when each download is complete.
345
  #
346
  def File.download(dest, src_files, opts = {}, &stat)
347
    dest.force_encoding('UTF-8')
348
    timestamp = opts["timestamp"]
349
    [*src_files].each { |src|
350
      src.force_encoding('UTF-8')
351
      if (::File.basename(dest) != File.basename(src))
352
        # The destination when downloading is a local file so use this
353
        # system's separator
354
        dest += ::File::SEPARATOR unless dest.end_with?(::File::SEPARATOR)
355
        dest += File.basename(src)
356
      end
357

358
      # XXX: dest can be the same object as src, so we use += instead of <<
359
      if timestamp
360
        dest += timestamp
361
      end
362

363
      stat.call('Downloading', src, dest) if (stat)
364
      result = download_file(dest, src, opts, &stat)
365
      stat.call(result, src, dest) if (stat)
366
    }
367
  end
368

369
  #
370
  # Download a single file.
371
  #
372
  def File.download_file(dest_file, src_file, opts = {}, &stat)
373
    stat ||= lambda { |a,b,c| }
374

375
    adaptive = opts["adaptive"]
376
    block_size = opts["block_size"] || 1024 * 1024
377
    continue = opts["continue"]
378
    tries_no = opts["tries_no"]
379
    tries = opts["tries"]
380

381
    src_fd = client.fs.file.new(src_file, "rb")
382

383
    # Check for changes
384
    src_stat = client.fs.filestat.new(src_file)
385
    if ::File.exist?(dest_file)
386
      dst_stat = ::File.stat(dest_file)
387
      if src_stat.size == dst_stat.size && src_stat.mtime == dst_stat.mtime
388
        src_fd.close
389
        return 'Skipped'
390
      end
391
    end
392

393
    # Make the destination path if necessary
394
    dir = ::File.dirname(dest_file)
395
    ::FileUtils.mkdir_p(dir) if dir and not ::File.directory?(dir)
396

397
    src_size = Filesize.new(src_stat.size).pretty
398

399
    if continue
400
      # continue downloading the file - skip downloaded part in the source
401
      dst_fd = ::File.new(dest_file, "ab")
402
      begin
403
        dst_fd.seek(0, ::IO::SEEK_END)
404
        in_pos = dst_fd.pos
405
        src_fd.seek(in_pos)
406
        stat.call("Continuing from #{Filesize.new(in_pos).pretty} of #{src_size}", src_file, dest_file)
407
      rescue
408
        # if we can't seek, download again
409
        stat.call('Error continuing - downloading from scratch', src_file, dest_file)
410
        dst_fd.close
411
        dst_fd = ::File.new(dest_file, "wb")
412
      end
413
    else
414
      dst_fd = ::File.new(dest_file, "wb")
415
    end
416

417
    # Keep transferring until EOF is reached...
418
    begin
419
      if tries
420
        # resume when timeouts encountered
421
        seek_back = false
422
        adjust_block = false
423
        tries_cnt = 0
424
        begin # while
425
          begin # exception
426
            if seek_back
427
              in_pos = dst_fd.pos
428
              src_fd.seek(in_pos)
429
              seek_back = false
430
              stat.call("Resuming at #{Filesize.new(in_pos).pretty} of #{src_size}", src_file, dest_file)
431
            else
432
              # successfully read and wrote - reset the counter
433
              tries_cnt = 0
434
            end
435
            adjust_block = true
436
            data = src_fd.read(block_size)
437
            adjust_block = false
438
          rescue Rex::TimeoutError
439
            # timeout encountered - either seek back and retry or quit
440
            if (tries && (tries_no == 0 || tries_cnt < tries_no))
441
              tries_cnt += 1
442
              seek_back = true
443
              # try a smaller block size for the next round
444
              if adaptive && adjust_block
445
                block_size = [block_size >> 1, MIN_BLOCK_SIZE].max
446
                adjust_block = false
447
                msg = "Error downloading, block size set to #{block_size} - retry # #{tries_cnt}"
448
                stat.call(msg, src_file, dest_file)
449
              else
450
                stat.call("Error downloading - retry # #{tries_cnt}", src_file, dest_file)
451
              end
452
              retry
453
            else
454
              stat.call('Error downloading - giving up', src_file, dest_file)
455
              raise
456
            end
457
          end
458
          dst_fd.write(data) if (data != nil)
459
          percent = dst_fd.pos.to_f / src_stat.size.to_f * 100.0
460
          msg = "Downloaded #{Filesize.new(dst_fd.pos).pretty} of #{src_size} (#{percent.round(2)}%)"
461
          stat.call(msg, src_file, dest_file)
462
        end while (data != nil)
463
      else
464
        # do the simple copying quitting on the first error
465
        while ((data = src_fd.read(block_size)) != nil)
466
          dst_fd.write(data)
467
          percent = dst_fd.pos.to_f / src_stat.size.to_f * 100.0
468
          msg = "Downloaded #{Filesize.new(dst_fd.pos).pretty} of #{src_size} (#{percent.round(2)}%)"
469
          stat.call(msg, src_file, dest_file)
470
        end
471
      end
472
    rescue EOFError
473
    ensure
474
      src_fd.close
475
      dst_fd.close
476
    end
477

478
    # Clone the times from the remote file
479
    ::File.utime(src_stat.atime, src_stat.mtime, dest_file)
480
    return 'Completed'
481
  end
482

483
  #
484
  # With no associated block, File.open is a synonym for ::new. If the optional
485
  # code block is given, it will be passed the opened file as an argument, and
486
  # the File object will automatically be closed when the block terminates. In
487
  # this instance, File.open returns the value of the block.
488
  #
489
  # (doc stolen from http://www.ruby-doc.org/core-1.9.3/File.html#method-c-open)
490
  #
491
  def File.open(name, mode="r", perms=0)
492
    f = new(name, mode, perms)
493
    if block_given?
494
      ret = yield f
495
      f.close
496
      return ret
497
    else
498
      return f
499
    end
500
  end
501

502
  ##
503
  #
504
  # Constructor
505
  #
506
  ##
507

508
  #
509
  # Initializes and opens the specified file with the specified permissions.
510
  #
511
  def initialize(name, mode = "r", perms = 0)
512
    self.client = self.class.client
513
    self.filed  = _open(name, mode, perms)
514
  end
515

516
  ##
517
  #
518
  # IO implementers
519
  #
520
  ##
521

522
  #
523
  # Returns whether or not the file has reach EOF.
524
  #
525
  def eof
526
    return self.filed.eof
527
  end
528

529
  #
530
  # Returns the current position of the file pointer.
531
  #
532
  def pos
533
    return self.filed.tell
534
  end
535

536
  #
537
  # Synonym for sysseek.
538
  #
539
  def seek(offset, whence = ::IO::SEEK_SET)
540
    return self.sysseek(offset, whence)
541
  end
542

543
  #
544
  # Seeks to the supplied offset based on the supplied relativity.
545
  #
546
  def sysseek(offset, whence = ::IO::SEEK_SET)
547
    return self.filed.seek(offset, whence)
548
  end
549

550
protected
551

552
  ##
553
  #
554
  # Internal methods
555
  #
556
  ##
557

558
  #
559
  # Creates a File channel using the supplied information.
560
  #
561
  def _open(name, mode = "r", perms = 0)
562
    return Rex::Post::Meterpreter::Channels::Pools::File.open(
563
        self.client, name, mode, perms)
564
  end
565

566
  attr_accessor :client # :nodoc:
567

568
end
569

570
end; end; end; end; end; end
571

572

573