Land #10450, Implementation of CTRL+Z in reverse shell session

Additionally, a check was added to disable this new functionality on
Windows command shell payloads.

lib/msf/core/session/interactive.rb

@@ -118,7 +118,10 @@ protected
       if !intent
         # TODO: Check the shell is interactive or not
         # If the current shell is not interactive, the ASCII Control Character will not work
+        if !(self.platform=="windows" && self.type =="shell")
+          print_status("Aborting foreground process in the shell session")
           self.rstream.write("\u0003")
+        end
         return
       end
     rescue Interrupt
@@ -139,9 +142,17 @@ protected
   #
   def _suspend
     # Ask the user if they would like to background the session
-    if (prompt_yesno("Background session #{name}?") == true)
+    intent = prompt_yesno("Background session #{name}?")
-      self.interacting = false
+    if !intent
+      # User does not want to background the current session
+      # Assuming the target is *nix, we'll forward CTRL-Z to the foreground process on the target
+      if !(self.platform=="windows" && self.type =="shell")
+        print_status("Backgrounding foreground process in the shell session")
+        self.rstream.write("\u001A")
       end
+      return
+    end
+    self.interacting = false
   end
 
   #
@@ -156,7 +167,7 @@ protected
   # Checks to see if the user wants to abort.
   #
   def user_want_abort?
-    prompt_yesno("Abort session #{name}? If not, the foreground process in the session will be killed")
+    prompt_yesno("Abort session #{name}?")
   end
 
 end