Land #10094, Improve network interface support for LHOST

lib/msf/core/opt.rb

@@ -25,8 +25,8 @@ module Msf
       Msf::OptPort.new(__method__.to_s, [ required, desc, default ])
     end
 
-    # @return [OptAddress]
-    def self.LHOST(default=nil, required=true, desc="The listen address")
+    # @return [OptAddressLocal]
+    def self.LHOST(default=nil, required=true, desc="The listen address (an interface may be specified)")
       Msf::OptAddressLocal.new(__method__.to_s, [ required, desc, default ])
     end
 

lib/msf/core/opt_address_local.rb

@@ -5,36 +5,39 @@ module Msf
 
 ###
 #
-# Network address option.
+# Local network address option.
 #
 ###
 class OptAddressLocal < OptAddress
+  def interfaces
+    NetworkInterface.interfaces || []
+  end
+
   def normalize(value)
-    return nil unless value.kind_of?(String)
+    return unless value.kind_of?(String)
+    return value unless interfaces.include?(value)
 
-    if NetworkInterface.interfaces.include?(value)
-      ip_address = NetworkInterface.addresses(value).values.flatten.collect{|x| x['addr']}.select do |addr|
-        begin
-          IPAddr.new(addr).ipv4?
-        rescue IPAddr::InvalidAddressError => e
-          false
-        end
+    addrs = NetworkInterface.addresses(value).values.flatten
+
+    # Strip interface name from address (see getifaddrs(3))
+    addrs = addrs.map { |x| x['addr'].split('%').first }.select do |addr|
+      begin
+        IPAddr.new(addr)
+      rescue IPAddr::InvalidAddressError
+        false
       end
-
-      return false if ip_address.blank?
-      return ip_address.first
     end
 
-    return value
+    addrs.any? ? addrs.first : ''
   end
 
   def valid?(value, check_empty: true)
     return false if check_empty && empty_required_value?(value)
-    return false unless value.kind_of?(String) or value.kind_of?(NilClass)
+    return false unless value.kind_of?(String) || value.kind_of?(NilClass)
 
-    return true if NetworkInterface.interfaces.include?(value)
+    return true if interfaces.include?(value)
 
-    return super
+    super
   end
 end
 

lib/msf/ui/console/command_dispatcher/core.rb

@@ -2189,6 +2189,12 @@ class Core
     return res
   end
 
+  # XXX: We repurpose OptAddressLocal#interfaces, so we can't put this in Rex
+  def tab_complete_source_interface(o)
+    return [] unless o.is_a?(Msf::OptAddressLocal)
+    o.interfaces
+  end
+
   #
   # Provide possible option values based on type
   #
@@ -2210,8 +2216,8 @@ class Core
           res << Rex::Socket.source_address(rh)
         else
           res += tab_complete_source_address
+          res += tab_complete_source_interface(o)
         end
-      else
       end
 
     when Msf::OptAddressRange

lib/rex/ui/text/dispatcher_shell.rb

@@ -289,11 +289,9 @@ module DispatcherShell
     def tab_complete_source_address
       addresses = [Rex::Socket.source_address]
       # getifaddrs was introduced in 2.1.2
-      if Socket.respond_to?(:getifaddrs)
-        ifaddrs = Socket.getifaddrs.find_all do |ifaddr|
-          ((ifaddr.flags & Socket::IFF_LOOPBACK) == 0) &&
-            ifaddr.addr &&
-            ifaddr.addr.ip?
+      if ::Socket.respond_to?(:getifaddrs)
+        ifaddrs = ::Socket.getifaddrs.select do |ifaddr|
+          ifaddr.addr && ifaddr.addr.ip?
         end
         addresses += ifaddrs.map { |ifaddr| ifaddr.addr.ip_address }
       end