1 /*******************************************************************************
2 * Copyright (c) 2017 Politecnico di Torino and others.
4 * All rights reserved. This program and the accompanying materials
5 * are made available under the terms of the Apache License, Version 2.0
6 * which accompanies this distribution, and is available at
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *******************************************************************************/
10 package mcnet.netobjs;
13 import java.util.ArrayList;
14 import java.util.List;
16 import com.microsoft.z3.BoolExpr;
17 import com.microsoft.z3.Context;
18 import com.microsoft.z3.DatatypeExpr;
19 import com.microsoft.z3.Expr;
20 import com.microsoft.z3.FuncDecl;
21 import com.microsoft.z3.IntExpr;
22 import com.microsoft.z3.Solver;
24 import mcnet.components.NetContext;
25 import mcnet.components.Network;
26 import mcnet.components.NetworkObject;
29 * Model of an anti-spam node
32 public class PolitoAntispam extends NetworkObject{
34 List<BoolExpr> constraints;
36 DatatypeExpr politoAntispam;
39 FuncDecl isInBlacklist;
41 public PolitoAntispam(Context ctx, Object[]... args) {
46 protected void init(Context ctx, Object[]... args) {
49 constraints = new ArrayList<BoolExpr>();
50 z3Node = ((NetworkObject)args[0][0]).getZ3Node();
51 politoAntispam = z3Node;
52 net = (Network)args[0][1];
53 nctx = (NetContext)args[0][2];
58 public DatatypeExpr getZ3Node() {
59 return politoAntispam;
63 protected void addConstraints(Solver solver) {
64 BoolExpr[] constr = new BoolExpr[constraints.size()];
65 solver.add(constraints.toArray(constr));
68 public void installAntispam (int[] blackList){
69 Expr n_0 = ctx.mkConst(politoAntispam+"_n_0", nctx.node);
70 Expr n_1 = ctx.mkConst(politoAntispam+"_n_1", nctx.node);
71 Expr p_0 = ctx.mkConst(politoAntispam+"_p_0", nctx.packet);
72 IntExpr t_0 = ctx.mkIntConst(politoAntispam+"_t_0");
73 IntExpr t_1 = ctx.mkIntConst(politoAntispam+"_t_1");
74 IntExpr ef_0 = ctx.mkIntConst(politoAntispam+"_ef_0");
76 isInBlacklist = ctx.mkFuncDecl(politoAntispam+"_isInBlacklist", ctx.mkIntSort(), ctx.mkBoolSort());
77 BoolExpr[] blConstraint = new BoolExpr[blackList.length];
78 if(blackList.length != 0){
79 for (int i=0;i<blackList.length;i++)
80 blConstraint[i]=(ctx.mkEq(ef_0,ctx.mkInt(blackList[i])));
81 //Constraint1a if(isInBlackList(ef_0) == or(for bl in blacklist (ef_0==bl)) ? true : false
82 constraints.add(ctx.mkForall(new Expr[]{ef_0}, ctx.mkIff((BoolExpr)isInBlacklist.apply(ef_0),ctx.mkOr(blConstraint)),1,null,null,null,null));
84 //Constraint1b isInblackList(ef_0) == false
85 constraints.add(ctx.mkForall(new Expr[]{ef_0}, ctx.mkEq((BoolExpr)isInBlacklist.apply(ef_0), ctx.mkBool(false)),1,null,null,null,null));
88 //Constraint2 send(politoAntispam, n_0, p, t_0) && p.proto(POP3_RESP) ->
89 // (exist n_1,t_1 : (recv(n_1, politoAntispam, p, t_1) && t_1 < t_0)) && !isInBlackList(p.emailFrom)
90 constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
91 ctx.mkImplies(ctx.mkAnd((BoolExpr)nctx.send.apply(politoAntispam, n_0, p_0, t_0), ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.POP3_RESPONSE))),
92 ctx.mkAnd( ctx.mkExists(new Expr[]{n_1, t_1},
93 ctx.mkAnd((BoolExpr)nctx.recv.apply(n_1, politoAntispam, p_0, t_1), ctx.mkLt(t_1 , t_0)),1,null,null,null,null),
94 ctx.mkNot((BoolExpr)isInBlacklist.apply(nctx.pf.get("emailFrom").apply(p_0))))),1,null,null,null,null));
96 //Constraint3 send(politoAntispam, n_0, p, t_0) && p.proto(POP3_REQ) ->
97 // (exist n_1,t_1 : (recv(n_1, politoAntispam, p, t_1) && t_1 < t_0))
98 constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
99 ctx.mkImplies(ctx.mkAnd((BoolExpr)nctx.send.apply(politoAntispam, n_0, p_0, t_0), ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.POP3_REQUEST))),
100 ctx.mkAnd(ctx.mkExists(new Expr[]{n_1, t_1},
101 ctx.mkAnd((BoolExpr)nctx.recv.apply(n_1, politoAntispam, p_0, t_1),
102 ctx.mkLt(t_1 , t_0)),1,null,null,null,null))),1,null,null,null,null));
104 //Constraint4 send(politoAntispam, politoErrFunction, p, t_0) ->
105 // (exist n_1,t_1 : (recv(n_1, politoAntispam, p, t_1) && t_1 < t_0 && p.emailFrom ==1))
106 constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
107 ctx.mkImplies((BoolExpr)nctx.send.apply(politoAntispam, nctx.nm.get("politoErrFunction").getZ3Node(), p_0, t_0),
108 ctx.mkAnd(ctx.mkExists(new Expr[]{n_1, t_1},
109 ctx.mkAnd((BoolExpr)nctx.recv.apply(n_1, politoAntispam, p_0, t_1),
111 ctx.mkEq(nctx.pf.get("emailFrom").apply(p_0),ctx.mkInt(1))),1,null,null,null,null))),1,null,null,null,null));
113 //Constraint5 send(politoAntispam, n_0, p, t_0) -> p.proto == POP_REQ || p.protpo == POP_RESP
114 constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
115 ctx.mkImplies((BoolExpr)nctx.send.apply(politoAntispam, n_0, p_0, t_0),
116 ctx.mkOr( ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.POP3_REQUEST)),
117 ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.POP3_RESPONSE)))),1,null,null,null,null));
119 //Constraint6 send(politoAntispam, n_0, p, t_0) -> nodeHasAddr(politoAntispam,p.src)
120 constraints.add( ctx.mkForall(new Expr[]{n_0, p_0, t_0},
121 ctx.mkImplies((BoolExpr)nctx.send.apply(politoAntispam, n_0, p_0, t_0),
122 ctx.mkNot((BoolExpr)nctx.nodeHasAddr.apply(politoAntispam,nctx.pf.get("src").apply(p_0)))),1,null,null,null,null));