Zach Goldman
737 lines
21 KiB
Ruby
737 lines
21 KiB
Ruby
# -*- coding: binary -*-
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require 'pp'
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require 'rex/text/table'
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require 'erb'
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module Rex
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module Ui
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module Text
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###
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#
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# The dispatcher shell class is designed to provide a generic means
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# of processing various shell commands that may be located in
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# different modules or chunks of codes. These chunks are referred
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# to as command dispatchers. The only requirement for command dispatchers is
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# that they prefix every method that they wish to be mirrored as a command
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# with the cmd_ prefix.
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#
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###
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module DispatcherShell
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include Resource
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###
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#
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# Empty template base class for command dispatchers.
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#
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###
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module CommandDispatcher
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module ClassMethods
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#
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# Check whether or not the command dispatcher is capable of handling the
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# specified command. The command may still be disabled through some means
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# at runtime.
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#
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# @param [String] name The name of the command to check.
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# @return [Boolean] true if the dispatcher can handle the command.
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def has_command?(name)
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self.method_defined?("cmd_#{name}")
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end
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def included(base)
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# Propagate the included hook
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CommandDispatcher.included(base)
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end
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end
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def self.included(base)
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# Install class methods so they are inheritable
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base.extend(ClassMethods)
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end
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#
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# Initializes the command dispatcher mixin.
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#
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def initialize(shell)
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self.shell = shell
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self.tab_complete_items = []
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end
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#
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# Returns nil for an empty set of commands.
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#
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# This method should be overridden to return a Hash with command
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# names for keys and brief help text for values.
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#
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def commands
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end
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#
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# Returns an empty set of commands.
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#
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# This method should be overridden if the dispatcher has commands that
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# should be treated as deprecated. Deprecated commands will not show up in
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# help and will not tab-complete, but will still be callable.
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#
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def deprecated_commands
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[]
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end
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#
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# Wraps shell.print_error
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#
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def print_error(msg = '')
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shell.print_error(msg)
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end
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alias_method :print_bad, :print_error
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#
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# Wraps shell.print_status
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#
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def print_status(msg = '')
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shell.print_status(msg)
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end
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#
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# Wraps shell.print_line
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#
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def print_line(msg = '')
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shell.print_line(msg)
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end
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#
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# Wraps shell.print_good
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#
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def print_good(msg = '')
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shell.print_good(msg)
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end
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#
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# Wraps shell.print_warning
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#
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def print_warning(msg = '')
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shell.print_warning(msg)
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end
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#
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# Wraps shell.print
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#
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def print(msg = '')
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shell.print(msg)
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end
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#
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# Print a warning that the called command is deprecated and optionally
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# forward to the replacement +method+ (useful for when commands are
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# renamed).
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#
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def deprecated_cmd(method=nil, *args)
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cmd = caller[0].match(/`cmd_(.*)'/)[1]
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print_error "The #{cmd} command is DEPRECATED"
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if cmd == "db_autopwn"
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print_error "See http://r-7.co/xY65Zr instead"
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elsif method and self.respond_to?("cmd_#{method}", true)
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print_error "Use #{method} instead"
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self.send("cmd_#{method}", *args)
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end
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end
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def deprecated_help(method=nil)
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cmd = caller[0].match(/`cmd_(.*)_help'/)[1]
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print_error "The #{cmd} command is DEPRECATED"
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if cmd == "db_autopwn"
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print_error "See http://r-7.co/xY65Zr instead"
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elsif method and self.respond_to?("cmd_#{method}_help", true)
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print_error "Use 'help #{method}' instead"
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self.send("cmd_#{method}_help")
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end
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end
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#
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# Wraps shell.update_prompt
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#
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def update_prompt(*args)
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shell.update_prompt(*args)
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end
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def cmd_help_help
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print_line "There's only so much I can do"
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end
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#
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# Displays the help banner. With no arguments, this is just a list of
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# all commands grouped by dispatcher. Otherwise, tries to use a method
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# named cmd_#{+cmd+}_help for the first dispatcher that has a command
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# named +cmd+. If no such method exists, uses +cmd+ as a regex to
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# compare against each enstacked dispatcher's name and dumps commands
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# of any that match.
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#
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def cmd_help(cmd=nil, *ignored)
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if cmd
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help_found = false
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cmd_found = false
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shell.dispatcher_stack.each do |dispatcher|
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next unless dispatcher.respond_to?(:commands)
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next if (dispatcher.commands.nil?)
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next if (dispatcher.commands.length == 0)
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if dispatcher.respond_to?("cmd_#{cmd}", true)
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cmd_found = true
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break unless dispatcher.respond_to?("cmd_#{cmd}_help", true)
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dispatcher.send("cmd_#{cmd}_help")
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help_found = true
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break
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end
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end
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unless cmd_found
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# We didn't find a cmd, try it as a dispatcher name
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shell.dispatcher_stack.each do |dispatcher|
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if dispatcher.name =~ /#{cmd}/i
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print_line(dispatcher.help_to_s)
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cmd_found = help_found = true
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end
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end
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end
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if docs_dir && File.exist?(File.join(docs_dir, cmd + '.md'))
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print_line
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print(File.read(File.join(docs_dir, cmd + '.md')))
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end
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print_error("No help for #{cmd}, try -h") if cmd_found and not help_found
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print_error("No such command") if not cmd_found
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else
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print(shell.help_to_s)
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if docs_dir && File.exist?(File.join(docs_dir + '.md'))
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print_line
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print(File.read(File.join(docs_dir + '.md')))
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end
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end
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end
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#
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# Tab completion for the help command
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#
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# By default just returns a list of all commands in all dispatchers.
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#
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def cmd_help_tabs(str, words)
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return [] if words.length > 1
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tabs = []
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shell.dispatcher_stack.each { |dispatcher|
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tabs += dispatcher.commands.keys
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}
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return tabs
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end
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alias cmd_? cmd_help
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#
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# Return a pretty, user-readable table of commands provided by this
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# dispatcher.
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# The command column width can be modified by passing in :command_width.
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#
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def help_to_s(opts={})
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# If this dispatcher has no commands, we can't do anything useful.
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return "" if commands.nil? or commands.length == 0
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# Display the commands
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tbl = Rex::Text::Table.new(
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'Header' => "#{self.name} Commands",
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'Indent' => opts['Indent'] || 4,
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'Columns' =>
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[
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'Command',
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'Description'
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],
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'ColProps' =>
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{
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'Command' =>
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{
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'Width' => opts[:command_width]
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}
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})
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commands.sort.each { |c|
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tbl << c
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}
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return "\n" + tbl.to_s + "\n"
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end
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#
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# Return the subdir of the `documentation/` directory that should be used
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# to find usage documentation
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#
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# TODO: get this value from somewhere that doesn't invert a bunch of
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# dependencies
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#
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def docs_dir
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File.expand_path(File.join(__FILE__, '..', '..', '..', '..', '..', 'documentation', 'cli'))
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end
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#
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# No tab completion items by default
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#
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attr_accessor :shell, :tab_complete_items
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#
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# Provide a generic tab completion for file names.
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#
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# If the only completion is a directory, this descends into that directory
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# and continues completions with filenames contained within.
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#
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def tab_complete_filenames(str, words)
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matches = ::Readline::FILENAME_COMPLETION_PROC.call(str)
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if matches and matches.length == 1 and File.directory?(matches[0])
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dir = matches[0]
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dir += File::SEPARATOR if dir[-1,1] != File::SEPARATOR
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matches = ::Readline::FILENAME_COMPLETION_PROC.call(dir)
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end
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matches.nil? ? [] : matches
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end
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#
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# Return a list of possible directory for tab completion.
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#
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def tab_complete_directory(str, words)
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directory = str[-1] == File::SEPARATOR ? str : File.dirname(str)
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filename = str[-1] == File::SEPARATOR ? '' : File.basename(str)
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entries = Dir.entries(directory).select { |fp| fp.start_with?(filename) }
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dirs = entries - ['.', '..']
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dirs = dirs.map { |fp| File.join(directory, fp).gsub(/\A\.\//, '') }
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dirs = dirs.select { |x| File.directory?(x) }
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dirs = dirs.map { |x| x + File::SEPARATOR }
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if dirs.length == 1 && dirs[0] != str && dirs[0].end_with?(File::SEPARATOR)
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# If Readline receives a single value from this function, it will assume we're done with the tab
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# completing, and add an extra space at the end.
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# This is annoying if we're recursively tab-traversing our way through subdirectories -
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# we may want to continue traversing, but MSF will add a space, requiring us to back up to continue
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# tab-completing our way through successive subdirectories.
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::Readline.completion_append_character = nil
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end
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if dirs.length == 0 && File.directory?(str)
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# we've hit the end of the road
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dirs = [str]
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end
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dirs
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end
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#
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# Provide a generic tab completion function based on the specification
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# pass as fmt. The fmt argument in a hash where values are an array
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# defining how the command should be completed. The first element of the
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# array can be one of:
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# nil - This argument is a flag and takes no option.
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# true - This argument takes an option with no suggestions.
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# :address - This option is a source address.
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# :bool - This option is a boolean.
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# :file - This option is a file path.
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# Array - This option is an array of possible values.
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#
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def tab_complete_generic(fmt, str, words)
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last_word = words[-1]
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fmt = fmt.select { |key, value| last_word == key || !words.include?(key) }
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val = fmt[last_word]
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return fmt.keys if !val # the last word does not look like a fmtspec
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arg = val[0]
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return fmt.keys if !arg # the last word is a fmtspec that takes no argument
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tabs = []
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if arg.to_s.to_sym == :address
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tabs = tab_complete_source_address
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elsif arg.to_s.to_sym == :bool
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tabs = ['true', 'false']
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elsif arg.to_s.to_sym == :file
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tabs = tab_complete_filenames(str, words)
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elsif arg.kind_of?(Array)
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tabs = arg.map {|a| a.to_s}
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end
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tabs
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end
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#
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# Return a list of possible source addresses for tab completion.
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#
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def tab_complete_source_address
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addresses = [Rex::Socket.source_address]
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# getifaddrs was introduced in 2.1.2
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if ::Socket.respond_to?(:getifaddrs)
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ifaddrs = ::Socket.getifaddrs.select do |ifaddr|
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ifaddr.addr && ifaddr.addr.ip?
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end
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addresses += ifaddrs.map { |ifaddr| ifaddr.addr.ip_address }
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end
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addresses
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end
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#
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# A callback that can be used to handle unknown commands. This can for example, allow a dispatcher to mark a command
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# as being disabled.
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#
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# @return [Symbol, nil] Returns a symbol specifying the action that was taken by the handler or `nil` if no action
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# was taken. The only supported action at this time is `:handled`, signifying that the unknown command was handled
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# by this dispatcher and no additional dispatchers should receive it.
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def unknown_command(method, line)
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nil
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end
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end
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#
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# DispatcherShell derives from shell.
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#
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include Shell
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#
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# Initialize the dispatcher shell.
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#
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def initialize(prompt, prompt_char = '>', histfile = nil, framework = nil, name = nil)
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super
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# Initialize the dispatcher array
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self.dispatcher_stack = []
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# Initialize the tab completion array
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self.on_command_proc = nil
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end
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#
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# This method accepts the entire line of text from the Readline
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# routine, stores all completed words, and passes the partial
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# word to the real tab completion function. This works around
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# a design problem in the Readline module and depends on the
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# Readline.basic_word_break_characters variable being set to \x00
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#
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def tab_complete(str)
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::Readline.completion_append_character = ' '
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::Readline.completion_case_fold = false
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# Check trailing whitespace so we can tell 'x' from 'x '
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str_match = str.match(/[^\\]([\\]{2})*\s+$/)
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str_trail = (str_match.nil?) ? '' : str_match[0]
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# Split the line up by whitespace into words
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split_str = shellsplitex(str)
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# Append an empty token if we had trailing whitespace
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split_str[:tokens] << { begin: str.length, value: '' } if str_trail.length > 0
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# Pop the last word and pass it to the real method
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result = tab_complete_stub(str, split_str)
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if result
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result.uniq
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else
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result
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end
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end
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# Performs tab completion of a command, if supported
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#
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def tab_complete_stub(original_str, split_str)
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*preceding_tokens, current_token = split_str[:tokens]
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return nil unless current_token
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items = []
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current_word = current_token[:value]
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tab_words = preceding_tokens.map { |word| word[:value] }
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# Next, try to match internal command or value completion
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# Enumerate each entry in the dispatcher stack
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dispatcher_stack.each do |dispatcher|
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# If no command is set and it supports commands, add them all
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if tab_words.empty? and dispatcher.respond_to?('commands')
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items.concat(dispatcher.commands.keys)
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end
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# If the dispatcher exports a tab completion function, use it
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if dispatcher.respond_to?('tab_complete_helper')
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res = dispatcher.tab_complete_helper(current_word, tab_words)
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else
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res = tab_complete_helper(dispatcher, current_word, tab_words)
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end
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if res.nil?
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# A nil response indicates no optional arguments
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return [''] if items.empty?
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else
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if res.second == :override_completions
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return res.first
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else
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# Otherwise we add the completion items to the list
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items.concat(res)
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end
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end
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end
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# Match based on the partial word
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matches = items.select do |word|
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word.downcase.start_with?(current_word.downcase)
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end
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# Prepend the preceding string of the command (or it all gets replaced!)
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preceding_str = original_str[0...current_token[:begin]]
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quote = current_token[:quote]
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matches_with_preceding_words_appended = matches.map do |word|
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word = quote.nil? ? word.gsub('\\') { '\\\\' }.gsub(' ', '\\ ') : "#{quote}#{word}#{quote}"
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preceding_str + word
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end
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matches_with_preceding_words_appended
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end
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#
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# Provide command-specific tab completion
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#
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def tab_complete_helper(dispatcher, str, words)
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tabs_meth = "cmd_#{words[0]}_tabs"
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# Is the user trying to tab complete one of our commands?
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if dispatcher.commands.include?(words[0]) and dispatcher.respond_to?(tabs_meth)
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res = dispatcher.send(tabs_meth, str, words)
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return [] if res.nil?
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return res
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end
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# Avoid the default completion list for unknown commands
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[]
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end
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#
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# Run a single command line.
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#
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# @param [String] line The command string that should be executed.
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# @param [Boolean] propagate_errors Whether or not to raise exceptions that are caught while executing the command.
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#
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# @return [Boolean] A boolean value signifying whether or not the command was handled. Value is `true` when the
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# command line was handled.
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def run_single(line, propagate_errors: false)
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arguments = parse_line(line)
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method = arguments.shift
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cmd_status = nil # currently either nil or :handled, more statuses can be added in the future
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error = false
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# If output is disabled output will be nil
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output.reset_color if (output)
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if (method)
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entries = dispatcher_stack.length
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dispatcher_stack.each { |dispatcher|
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next if not dispatcher.respond_to?('commands')
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begin
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if (dispatcher.commands.has_key?(method) or dispatcher.deprecated_commands.include?(method))
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self.on_command_proc.call(line.strip) if self.on_command_proc
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run_command(dispatcher, method, arguments)
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cmd_status = :handled
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elsif cmd_status.nil?
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cmd_status = dispatcher.unknown_command(method, line)
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end
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rescue ::Interrupt
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cmd_status = :handled
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print_error("#{method}: Interrupted")
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raise if propagate_errors
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rescue OptionParser::ParseError => e
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print_error("#{method}: #{e.message}")
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raise if propagate_errors
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rescue
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error = $!
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|
|
|
print_error(
|
|
"Error while running command #{method}: #{$!}" +
|
|
"\n\nCall stack:\n#{$@.join("\n")}")
|
|
|
|
raise if propagate_errors
|
|
rescue ::Exception => e
|
|
error = $!
|
|
|
|
print_error(
|
|
"Error while running command #{method}: #{$!}")
|
|
|
|
raise if propagate_errors
|
|
end
|
|
|
|
# If the dispatcher stack changed as a result of this command,
|
|
# break out
|
|
break if (dispatcher_stack.length != entries)
|
|
}
|
|
|
|
if (cmd_status.nil? && error == false)
|
|
unknown_command(method, line)
|
|
end
|
|
end
|
|
|
|
return cmd_status == :handled
|
|
end
|
|
|
|
#
|
|
# Runs the supplied command on the given dispatcher.
|
|
#
|
|
def run_command(dispatcher, method, arguments)
|
|
self.busy = true
|
|
|
|
if(blocked_command?(method))
|
|
print_error("The #{method} command has been disabled.")
|
|
else
|
|
dispatcher.send('cmd_' + method, *arguments)
|
|
end
|
|
ensure
|
|
self.busy = false
|
|
end
|
|
|
|
#
|
|
# If the command is unknown...
|
|
#
|
|
def unknown_command(method, line)
|
|
# Map each dispatchers commands to valid_commands
|
|
valid_commands = dispatcher_stack.flat_map { |dispatcher| dispatcher.commands.keys }
|
|
|
|
message = "Unknown command: #{method}."
|
|
suggestion = DidYouMean::SpellChecker.new(dictionary: valid_commands).correct(method).first
|
|
message << " Did you mean %grn#{suggestion}%clr?" if suggestion
|
|
message << ' Run the %grnhelp%clr command for more details.'
|
|
|
|
print_error(message)
|
|
end
|
|
|
|
#
|
|
# Push a dispatcher to the front of the stack.
|
|
#
|
|
def enstack_dispatcher(dispatcher)
|
|
self.dispatcher_stack.unshift(inst = dispatcher.new(self))
|
|
|
|
inst
|
|
end
|
|
|
|
#
|
|
# Pop a dispatcher from the front of the stacker.
|
|
#
|
|
def destack_dispatcher
|
|
self.dispatcher_stack.shift
|
|
end
|
|
|
|
#
|
|
# Adds the supplied dispatcher to the end of the dispatcher stack so that
|
|
# it doesn't affect any enstack'd dispatchers.
|
|
#
|
|
def append_dispatcher(dispatcher)
|
|
inst = dispatcher.new(self)
|
|
self.dispatcher_stack.each { |disp|
|
|
if (disp.name == inst.name)
|
|
raise "Attempting to load already loaded dispatcher #{disp.name}"
|
|
end
|
|
}
|
|
self.dispatcher_stack.push(inst)
|
|
|
|
inst
|
|
end
|
|
|
|
#
|
|
# Removes the supplied dispatcher instance.
|
|
#
|
|
def remove_dispatcher(name)
|
|
self.dispatcher_stack.delete_if { |inst|
|
|
(inst.name == name)
|
|
}
|
|
end
|
|
|
|
#
|
|
# Returns the current active dispatcher
|
|
#
|
|
def current_dispatcher
|
|
self.dispatcher_stack[0]
|
|
end
|
|
|
|
#
|
|
# Return a readable version of a help banner for all of the enstacked
|
|
# dispatchers.
|
|
#
|
|
# See +CommandDispatcher#help_to_s+
|
|
#
|
|
def help_to_s(opts = {})
|
|
str = ''
|
|
|
|
max_command_length = dispatcher_stack.flat_map { |dispatcher| dispatcher.commands.to_a }.map { |(name, _description)| name.length }.max
|
|
|
|
dispatcher_stack.reverse.each { |dispatcher|
|
|
str << dispatcher.help_to_s(opts.merge({ command_width: [max_command_length, 12].max }))
|
|
}
|
|
|
|
return str << "For more info on a specific command, use %grn<command> -h%clr or %grnhelp <command>%clr.\n\n"
|
|
end
|
|
|
|
|
|
#
|
|
# Returns nil for an empty set of blocked commands.
|
|
#
|
|
def blocked_command?(cmd)
|
|
return false if not self.blocked
|
|
self.blocked.has_key?(cmd)
|
|
end
|
|
|
|
#
|
|
# Block a specific command
|
|
#
|
|
def block_command(cmd)
|
|
self.blocked ||= {}
|
|
self.blocked[cmd] = true
|
|
end
|
|
|
|
#
|
|
# Unblock a specific command
|
|
#
|
|
def unblock_command(cmd)
|
|
self.blocked || return
|
|
self.blocked.delete(cmd)
|
|
end
|
|
|
|
#
|
|
# Split a line as Shellwords.split would however instead of raising an
|
|
# ArgumentError on unbalanced quotes return the remainder of the string as if
|
|
# the last character were the closing quote.
|
|
#
|
|
# This code was originally taken from https://github.com/ruby/ruby/blob/93420d34aaf8c30f11a66dd08eb186da922c831d/lib/shellwords.rb#L88
|
|
#
|
|
def shellsplitex(line)
|
|
tokens = []
|
|
field_value = String.new
|
|
field_begin = nil
|
|
|
|
line.scan(/\G(\s*)(?>([^\s\\\'\"]+)|'([^\']*)'|"((?:[^\"\\]|\\.)*)"|(\\.?)|(\S))(\s|\z)?/m) do |preceding_whitespace, word, sq, dq, esc, garbage, sep|
|
|
field_begin ||= Regexp.last_match.begin(0) + preceding_whitespace.length
|
|
if garbage
|
|
quote_start_begin = Regexp.last_match.begin(0) + preceding_whitespace.length
|
|
field_quote = garbage
|
|
field_value << line[quote_start_begin + 1..-1].gsub('\\\\', '\\')
|
|
|
|
tokens << { begin: field_begin, value: field_value, quote: field_quote }
|
|
break
|
|
end
|
|
|
|
field_value << (word || sq || (dq && dq.gsub(/\\([$`"\\\n])/, '\\1')) || esc.gsub(/\\(.)/, '\\1'))
|
|
if sep
|
|
tokens << { begin: field_begin, value: field_value, quote: ((sq && "'") || (dq && '"') || nil) }
|
|
field_value = String.new
|
|
field_begin = nil
|
|
end
|
|
end
|
|
|
|
{ tokens: tokens }
|
|
end
|
|
|
|
attr_accessor :dispatcher_stack # :nodoc:
|
|
attr_accessor :busy # :nodoc:
|
|
attr_accessor :blocked # :nodoc:
|
|
|
|
end
|
|
|
|
end
|
|
end
|
|
end
|