114 lines
4.1 KiB
Plaintext
114 lines
4.1 KiB
Plaintext
(*****************************************************************************
|
|
* Copyright (c) 2005-2010 ETH Zurich, Switzerland
|
|
* 2008-2015 Achim D. Brucker, Germany
|
|
* 2009-2016 Université Paris-Sud, France
|
|
* 2015-2016 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{* Personal Firewall: Integer *}
|
|
theory
|
|
PersonalFirewallInt
|
|
imports
|
|
"../../UPF-Firewall"
|
|
begin
|
|
|
|
text{*
|
|
The most basic firewall scenario; there is a personal PC on one side and the Internet on the other.
|
|
There are two policies: the first one allows all traffic from the PC to the Internet and denies
|
|
all coming into the PC. The second policy only allows specific ports from the PC. This scenario
|
|
comes in three variants: the first one specifies the allowed protocols directly, the second together
|
|
with their respective port numbers, the third one only with the port numbers.
|
|
*}
|
|
|
|
|
|
|
|
text{*
|
|
Definitions of the subnets
|
|
*}
|
|
|
|
definition
|
|
PC :: "(adr\<^sub>i\<^sub>p net)" where
|
|
"PC = {{(a,b). a = 3}}"
|
|
|
|
definition
|
|
Internet :: "adr\<^sub>i\<^sub>p net" where
|
|
"Internet = {{(a,b). \<not> (a = 3)}}"
|
|
|
|
|
|
|
|
text{*
|
|
Definition of the testing constraint
|
|
*}
|
|
|
|
|
|
|
|
definition
|
|
not_in_same_net :: "(adr\<^sub>i\<^sub>p,DummyContent) packet \<Rightarrow> bool" where
|
|
"not_in_same_net x = ((src x \<sqsubset> PC \<longrightarrow> dest x \<sqsubset> Internet) \<and> (src x \<sqsubset> Internet \<longrightarrow> dest x \<sqsubset> PC))"
|
|
|
|
text {*
|
|
Definitions of the policies
|
|
*}
|
|
|
|
|
|
|
|
definition
|
|
strictPolicy :: "(adr\<^sub>i\<^sub>p,DummyContent) FWPolicy" where
|
|
"strictPolicy = deny_all ++ allow_all_from_to PC Internet"
|
|
|
|
definition
|
|
PortPolicy :: "(adr\<^sub>i\<^sub>p,DummyContent) FWPolicy" where
|
|
"PortPolicy = deny_all ++ allow_from_ports_to {http,smtp,ftp} PC Internet"
|
|
|
|
definition
|
|
PortPolicyBig :: "(adr\<^sub>i\<^sub>p,DummyContent) FWPolicy" where
|
|
"PortPolicyBig = deny_all ++
|
|
allow_from_port_to http PC Internet ++
|
|
allow_from_port_to smtp PC Internet ++
|
|
allow_from_port_to ftp PC Internet"
|
|
|
|
|
|
lemmas policyLemmas = strictPolicy_def PortPolicy_def PC_def
|
|
Internet_def PortPolicyBig_def src_def dest_def
|
|
adr\<^sub>i\<^sub>pLemmas content_def
|
|
PortCombinators in_subnet_def PortPolicyBig_def id_def
|
|
|
|
|
|
declare Ports [simp add]
|
|
|
|
definition wellformed_packet::"(adr\<^sub>i\<^sub>p,DummyContent) packet \<Rightarrow> bool" where
|
|
"wellformed_packet p = (content p = data)"
|
|
|
|
|
|
end
|