Change powershell platform to windows and add powershell support to some methods

lib/msf/base/sessions/powershell.rb

@@ -30,7 +30,7 @@ def self.type
   # Returns the session platform.
   #
   def platform
-    "win"
+    "windows"
   end
 
   #

lib/msf/core/post/file.rb

@@ -49,6 +49,8 @@ def cd(path)
   def pwd
     if session.type == "meterpreter"
       return session.fs.dir.getwd
+    elsif session.type == 'powershell'
+      return cmd_exec('(Get-Location).Path').strip
     else
       if session.platform == 'windows'
         # XXX: %CD% only exists on XP and newer, figure something out for NT4
@@ -159,6 +161,8 @@ def file?(path)
       stat = session.fs.file.stat(path) rescue nil
       return false unless stat
       return stat.file?
+    elsif session.type == 'powershell'
+      return cmd_exec("Test-Path \"#{path}\" -PathType leaf")&.include?("True")
     else
       if session.platform == 'windows'
         f = cmd_exec("cmd.exe /C IF exist \"#{path}\" ( echo true )")
@@ -245,6 +249,8 @@ def exist?(path)
     if session.type == 'meterpreter'
       stat = session.fs.file.stat(path) rescue nil
       return !!(stat)
+    elsif session.type == 'powershell'
+      return cmd_exec("Test-Path \"#{path}\"")&.include?("True")
     else
       if session.platform == 'windows'
         f = cmd_exec("cmd.exe /C IF exist \"#{path}\" ( echo true )")
@@ -469,7 +475,9 @@ def exploit_data(data_directory, file)
   def rm_f(*remote_files)
     remote_files.each do |remote|
       if session.type == "meterpreter"
-        session.fs.file.delete(remote) if exist?(remote)
+        session.fs.file.delete(remote) if file?(remote)
+      elsif session.type == 'powershell'
+        cmd_exec("Remove-Item \"#{remote}\" -Force") if file?(remote)
       else
         if session.platform == 'windows'
           cmd_exec("del /q /f \"#{remote}\"")
@@ -490,6 +498,8 @@ def rm_rf(*remote_dirs)
     remote_dirs.each do |remote|
       if session.type == "meterpreter"
         session.fs.dir.rmdir(remote) if exist?(remote)
+      elsif session.type == 'powershell'
+        cmd_exec("Remove-Item -Path \"#{remote}\" -Force -Recurse")
       else
         if session.platform == 'windows'
           cmd_exec("rd /s /q \"#{remote}\"")

lib/msf/core/post/process.rb

@@ -36,21 +36,15 @@ def has_pid?(pid)
   # Gets the `pid` and `name` of the processes on the remote system
   #
   def get_processes
-    if session_has_process_ext
+    if session.type == 'meterpreter'
       meterpreter_get_processes
+    elsif session.type == 'powershell'
+      shell_get_processes
     else
       shell_get_processes
     end
   end
 
-  def session_has_process_ext
-    begin
-      return !!(session.sys and session.sys.process)
-    rescue NoMethodError
-      return false
-    end
-  end
-
   def meterpreter_get_processes
     begin
       return session.sys.process.get_processes.map { |p| p.slice('name', 'pid') }