Add initial wall module

Author: jhart-r7

modules/post/multi/general/wall.rb

@@ -0,0 +1,48 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Post
+  def initialize(info = {})
+    super(
+      update_info(
+        info,
+        'Name'          => 'Write Messages to Users',
+        'Description'   => %q{
+          This module utilizes the wall(1) or write(1) utilities, as appropriate,
+          to send messages to users on the target system.
+        },
+        'License'       => MSF_LICENSE,
+        'Author'        => [ 'Jon Hart <jon_hart[at]rapid7.com>' ],
+        # TODO: is there a way to do this on Windows?
+        'Platform'      => %w(linux osx unix),
+        'SessionTypes'  => %w(shell meterpreter)
+      )
+    )
+    register_options(
+      [
+        OptString.new('MESSAGE', [true, 'The message to send']),
+        OptString.new('USERS', [false, 'List of users to write(1) to, separated by commas. ' \
+                      ' wall(1)s to all users by default'])
+      ], self.class)
+  end
+
+  def users
+    datastore['USERS'] ? datastore['USERS'].split(/\s*,\s*/) : nil
+  end
+
+  def message
+    datastore['MESSAGE'] ? datastore['MESSAGE'] : "Hello metasploit session #{session.id}, the time is #{Time.now}"
+  end
+
+  def run
+    if users
+      users.map { |user| cmd_exec("echo '#{message}' | write #{user}") }
+    else
+      cmd_exec("echo '#{message}' | wall")
+    end
+  end
+end