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/*******************************************************************************
* Copyright (c) 2017 Politecnico di Torino and others.
*
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Apache License, Version 2.0
* which accompanies this distribution, and is available at
* http://www.apache.org/licenses/LICENSE-2.0
*******************************************************************************/
package mcnet.netobjs;
import java.util.ArrayList;
import java.util.List;
import com.microsoft.z3.BoolExpr;
import com.microsoft.z3.Context;
import com.microsoft.z3.DatatypeExpr;
import com.microsoft.z3.Expr;
import com.microsoft.z3.FuncDecl;
import com.microsoft.z3.IntExpr;
import com.microsoft.z3.Solver;
import mcnet.components.NetContext;
import mcnet.components.Network;
import mcnet.components.NetworkObject;
public class PolitoVpnAccess extends NetworkObject {
List<BoolExpr> constraints = new ArrayList<BoolExpr>();
DatatypeExpr politoVpnAccess;
FuncDecl private_addr_func;
NetContext nctx;
Context ctx;
Network net;
public PolitoVpnAccess(Context ctx, Object[]... args) {
super(ctx, args);
}
@Override
public DatatypeExpr getZ3Node() {
return politoVpnAccess;
}
@Override
protected void init(Context ctx, Object[]... args) {
this.ctx = ctx;
this.isEndHost = false;
this.politoVpnAccess = this.z3Node = ((NetworkObject)args[0][0]).getZ3Node();
this.net = (Network)args[0][1];
this.nctx = (NetContext)args[0][2];
}
@Override
protected void addConstraints(Solver solver) {
BoolExpr[] constr = new BoolExpr[constraints.size()];
solver.add(constraints.toArray(constr));
}
public void vpnAccessModel(DatatypeExpr vpnAccessIp, DatatypeExpr vpnExitIp) {
Expr x = ctx.mkConst("vpn_x", nctx.node);
Expr y = ctx.mkConst("vpn_y", nctx.node);
Expr p_0 = ctx.mkConst("vpn_p_0", nctx.packet);
Expr p_1 = ctx.mkConst("vpn_p_1", nctx.packet);
IntExpr t_0 = ctx.mkIntConst("vpn_t_0");
IntExpr t_1 = ctx.mkIntConst("vpn_t_1");
private_addr_func = ctx.mkFuncDecl("vpn_private_addr_func", nctx.address, ctx.mkBoolSort());
BoolExpr constraint1 = ctx.mkForall(new Expr[]{t_0, p_0, x},
ctx.mkImplies(ctx.mkAnd(
(BoolExpr)nctx.send.apply(politoVpnAccess, x, p_0, t_0),
ctx.mkEq(nctx.pf.get("inner_src").apply(p_0), nctx.am.get("null"))),
ctx.mkAnd(
(BoolExpr)private_addr_func.apply(nctx.pf.get("dest").apply(p_0)),
ctx.mkNot((BoolExpr)nctx.pf.get("encrypted").apply(p_0)),
ctx.mkExists(new Expr[]{y, p_1, t_1},
ctx.mkAnd((BoolExpr)nctx.recv.apply(y, politoVpnAccess, p_1, t_1),
ctx.mkLt(t_1, t_0),
(BoolExpr)nctx.pf.get("encrypted").apply(p_1),
ctx.mkEq(nctx.pf.get("src").apply(p_1), vpnExitIp),
ctx.mkEq(nctx.pf.get("dest").apply(p_1), vpnAccessIp),
ctx.mkEq(nctx.pf.get("inner_src").apply(p_1), nctx.pf.get("src").apply(p_0)),
ctx.mkEq(nctx.pf.get("inner_dest").apply(p_1), nctx.pf.get("dest").apply(p_0)),
ctx.mkEq(nctx.pf.get("origin").apply(p_1), nctx.pf.get("origin").apply(p_0)),
ctx.mkEq(nctx.pf.get("orig_body").apply(p_1), nctx.pf.get("orig_body").apply(p_0)),
ctx.mkEq(nctx.pf.get("body").apply(p_1), nctx.pf.get("body").apply(p_0)),
ctx.mkEq(nctx.pf.get("seq").apply(p_1), nctx.pf.get("seq").apply(p_0)),
ctx.mkEq(nctx.pf.get("proto").apply(p_1), nctx.pf.get("proto").apply(p_0)),
ctx.mkEq(nctx.pf.get("emailFrom").apply(p_1), nctx.pf.get("emailFrom").apply(p_0)),
ctx.mkEq(nctx.pf.get("url").apply(p_1), nctx.pf.get("url").apply(p_0)),
ctx.mkEq(nctx.pf.get("options").apply(p_1), nctx.pf.get("options").apply(p_0))), 1, null, null, null, null))),
1,null,null,null,null);
constraints.add(constraint1);
BoolExpr constraint2 = ctx.mkForall(new Expr[]{t_0, p_0, x},
ctx.mkImplies(ctx.mkAnd(
(BoolExpr)nctx.send.apply(politoVpnAccess, x, p_0, t_0),
ctx.mkNot(ctx.mkEq(nctx.pf.get("inner_src").apply(p_0), nctx.am.get("null")))),
ctx.mkAnd(
ctx.mkEq(nctx.pf.get("src").apply(p_0), vpnAccessIp),
ctx.mkEq(nctx.pf.get("dest").apply(p_0), vpnExitIp),
(BoolExpr)private_addr_func.apply(nctx.pf.get("inner_src").apply(p_0)),
ctx.mkNot(ctx.mkEq(nctx.pf.get("inner_dest").apply(p_0), vpnAccessIp)),
(BoolExpr)nctx.pf.get("encrypted").apply(p_0),
ctx.mkExists(new Expr[]{y, p_1, t_1},
ctx.mkAnd((BoolExpr)nctx.recv.apply(y, politoVpnAccess, p_1, t_1),
ctx.mkLt(t_1, t_0),
ctx.mkNot((BoolExpr)nctx.pf.get("encrypted").apply(p_1)),
ctx.mkEq(nctx.pf.get("src").apply(p_1), nctx.pf.get("inner_src").apply(p_0)),
ctx.mkEq(nctx.pf.get("dest").apply(p_1), nctx.pf.get("inner_dest").apply(p_0)),
ctx.mkEq(nctx.pf.get("inner_src").apply(p_1), nctx.am.get("null")),
ctx.mkEq(nctx.pf.get("inner_dest").apply(p_1), nctx.am.get("null")),
ctx.mkEq(nctx.pf.get("origin").apply(p_1), nctx.pf.get("origin").apply(p_0)),
ctx.mkEq(nctx.pf.get("orig_body").apply(p_1), nctx.pf.get("orig_body").apply(p_0)),
ctx.mkEq(nctx.pf.get("body").apply(p_1), nctx.pf.get("body").apply(p_0)),
ctx.mkEq(nctx.pf.get("seq").apply(p_1), nctx.pf.get("seq").apply(p_0)),
ctx.mkEq(nctx.pf.get("proto").apply(p_1), nctx.pf.get("proto").apply(p_0)),
ctx.mkEq(nctx.pf.get("emailFrom").apply(p_1), nctx.pf.get("emailFrom").apply(p_0)),
ctx.mkEq(nctx.pf.get("url").apply(p_1), nctx.pf.get("url").apply(p_0)),
ctx.mkEq(nctx.pf.get("options").apply(p_1), nctx.pf.get("options").apply(p_0))), 1, null, null, null, null))),
1,null,null,null,null);
constraints.add(constraint2);
}
public void setInternalAddress(ArrayList<DatatypeExpr> internalAddress){
List<BoolExpr> constr = new ArrayList<BoolExpr>();
Expr n_0 = ctx.mkConst("vpn_node", nctx.address);
for(DatatypeExpr n : internalAddress){
constr.add(ctx.mkEq(n_0,n));
}
BoolExpr[] constrs = new BoolExpr[constr.size()];
//Constraint private_addr_func(n_0) == or(n_0==n foreach internal address)
constraints.add(ctx.mkForall(new Expr[]{n_0}, ctx.mkEq(private_addr_func.apply(n_0),ctx.mkOr(constr.toArray(constrs))),1,null,null,null,null));
}
}
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