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