86 lines
4.0 KiB
Plaintext
86 lines
4.0 KiB
Plaintext
(*****************************************************************************
|
|
* Copyright (c) 2005-2010 ETH Zurich, Switzerland
|
|
* 2008-2015 Achim D. Brucker, Germany
|
|
* 2009-2017 Université Paris-Sud, France
|
|
* 2015-2017 The University of Sheffield, UK
|
|
*
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions are
|
|
* met:
|
|
*
|
|
* * Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
*
|
|
* * Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials provided
|
|
* with the distribution.
|
|
*
|
|
* * Neither the name of the copyright holders nor the names of its
|
|
* contributors may be used to endorse or promote products derived
|
|
* from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*****************************************************************************)
|
|
|
|
subsection \<open>Policy Combinators\<close>
|
|
theory
|
|
PolicyCombinators
|
|
imports
|
|
PolicyCore
|
|
begin
|
|
|
|
text\<open>In order to ease the specification of a concrete policy, we
|
|
define some combinators. Using these combinators, the specification
|
|
of a policy gets very easy, and can be done similarly as in tools
|
|
like IPTables.\<close>
|
|
|
|
definition
|
|
allow_all_from :: "'\<alpha>::adr net \<Rightarrow> (('\<alpha>,'\<beta>) packet \<mapsto> unit)" where
|
|
"allow_all_from src_net = {pa. src pa \<sqsubset> src_net} \<triangleleft> A\<^sub>U "
|
|
|
|
definition
|
|
deny_all_from :: "'\<alpha>::adr net \<Rightarrow> (('\<alpha>,'\<beta>) packet \<mapsto> unit)" where
|
|
"deny_all_from src_net = {pa. src pa \<sqsubset> src_net} \<triangleleft>D\<^sub>U "
|
|
|
|
definition
|
|
allow_all_to :: "'\<alpha>::adr net \<Rightarrow> (('\<alpha>,'\<beta>) packet \<mapsto> unit)" where
|
|
"allow_all_to dest_net = {pa. dest pa \<sqsubset> dest_net} \<triangleleft> A\<^sub>U"
|
|
|
|
definition
|
|
deny_all_to :: "'\<alpha>::adr net \<Rightarrow> (('\<alpha>,'\<beta>) packet \<mapsto> unit)" where
|
|
"deny_all_to dest_net = {pa. dest pa \<sqsubset> dest_net} \<triangleleft>D\<^sub>U "
|
|
|
|
definition
|
|
allow_all_from_to :: "'\<alpha>::adr net \<Rightarrow> '\<alpha>::adr net \<Rightarrow> (('\<alpha>,'\<beta>) packet \<mapsto> unit)" where
|
|
"allow_all_from_to src_net dest_net =
|
|
{pa. src pa \<sqsubset> src_net \<and> dest pa \<sqsubset> dest_net} \<triangleleft> A\<^sub>U "
|
|
|
|
definition
|
|
deny_all_from_to :: "'\<alpha>::adr net \<Rightarrow> '\<alpha>::adr net \<Rightarrow> (('\<alpha>,'\<beta>) packet \<mapsto> unit)" where
|
|
"deny_all_from_to src_net dest_net = {pa. src pa \<sqsubset> src_net \<and> dest pa \<sqsubset> dest_net} \<triangleleft> D\<^sub>U"
|
|
|
|
|
|
text\<open>All these combinators and the default rules are put into one
|
|
single lemma called \<open>PolicyCombinators\<close> to facilitate proving
|
|
over policies.\<close>
|
|
|
|
|
|
lemmas PolicyCombinators = allow_all_from_def deny_all_from_def
|
|
allow_all_to_def deny_all_to_def allow_all_from_to_def
|
|
deny_all_from_to_def UPFDefs
|
|
|
|
end
|