diff options
Diffstat (limited to 'verigraph/src/it/polito/verigraph/mcnet/netobjs/PolitoIDS.java')
| -rw-r--r-- | verigraph/src/it/polito/verigraph/mcnet/netobjs/PolitoIDS.java | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/verigraph/src/it/polito/verigraph/mcnet/netobjs/PolitoIDS.java b/verigraph/src/it/polito/verigraph/mcnet/netobjs/PolitoIDS.java new file mode 100644 index 0000000..8251c71 --- /dev/null +++ b/verigraph/src/it/polito/verigraph/mcnet/netobjs/PolitoIDS.java @@ -0,0 +1,139 @@ +/******************************************************************************* + * 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 it.polito.verigraph.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 it.polito.verigraph.mcnet.components.NetContext; +import it.polito.verigraph.mcnet.components.Network; +import it.polito.verigraph.mcnet.components.NetworkObject; + +public class PolitoIDS extends NetworkObject { + + public static final int DROGA = 1; //no go + public static final int GATTINI = 2; //go + + Context ctx; + List<BoolExpr> constraints = new ArrayList<BoolExpr>(); + DatatypeExpr politoIDS; + Network net; + NetContext nctx; + FuncDecl isInBlacklist; + + + public PolitoIDS(Context ctx, Object[]...args){ + super(ctx, args); + } + + @Override + public DatatypeExpr getZ3Node() { + return politoIDS; + } + + @Override + protected void init(Context ctx, Object[]... args) { + + this.ctx = ctx; + this.isEndHost = false; + this.politoIDS = 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 installIDS(int[] blackList){ + Expr n_0 = ctx.mkConst(politoIDS + "_n_0", nctx.node); + Expr n_1 = ctx.mkConst(politoIDS + "_n_1", nctx.node); + Expr p_0 = ctx.mkConst(politoIDS + "_p_0", nctx.packet); + IntExpr t_0 = ctx.mkIntConst(politoIDS + "_t_0"); + IntExpr t_1 = ctx.mkIntConst(politoIDS + "_t_1"); + Expr b_0 = ctx.mkIntConst(politoIDS + "_b_0"); + + isInBlacklist = ctx.mkFuncDecl(politoIDS + "_isInBlacklist", ctx.mkIntSort(), ctx.mkBoolSort()); + + + BoolExpr[] blConstraints = new BoolExpr[blackList.length]; + if(blackList.length != 0){ + + for(int i = 0; i<blackList.length; i++) + blConstraints[i] = ctx.mkEq(b_0, ctx.mkInt(blackList[i])); + + this.constraints.add(ctx.mkForall(new Expr[]{b_0}, + ctx.mkIff((BoolExpr)isInBlacklist.apply(b_0), ctx.mkOr(blConstraints)), + 1, + null, null, null, null)); + + }else{ + this.constraints.add(ctx.mkForall(new Expr[]{b_0}, + ctx.mkEq(isInBlacklist.apply(b_0), ctx.mkBool(false)), + 1, + null, null, null, null)); + } + + //Constraint2 send(politoIDS, n_0, p, t_0) && (p.proto(HTTP_RESPONSE) || p.proto(HTTP_REQUEST)) -> + //(exist n_1,t_1 : (recv(n_1, politoIDS, p, t_1) && t_1 < t_0)) && !isInBlackList(p.body) + + this.constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0}, + ctx.mkImplies(ctx.mkAnd((BoolExpr)nctx.send.apply(politoIDS, n_0, p_0, t_0), ctx.mkOr(ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.HTTP_RESPONSE)), ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.HTTP_REQUEST)))), + ctx.mkAnd(ctx.mkExists(new Expr[]{n_1,t_1}, + ctx.mkAnd((BoolExpr)nctx.recv.apply(n_1,politoIDS,p_0,t_1),ctx.mkLt(t_1, t_0)), + 1, + null, null, null, null), + ctx.mkNot((BoolExpr)isInBlacklist.apply(nctx.pf.get("body").apply(p_0))))), + 1, + null, null, null, null)); + + //Constraint3 send(politoIDS, n_0, p, t_0) && p.proto(HTTP_REQUEST) -> + //(exist n_1,t_1 : (recv(n_1, politoIDS, p, t_1) && t_1 < t_0)) Constraint not needed anymore (included in contr. 2) + /* this.constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0}, + ctx.mkImplies(ctx.mkAnd((BoolExpr)nctx.send.apply(politoIDS, n_0, p_0, t_0), ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.HTTP_REQUEST))), + ctx.mkAnd(ctx.mkExists(new Expr[]{n_1,t_1}, + ctx.mkAnd((BoolExpr)nctx.recv.apply(n_1,politoIDS,p_0,t_1),ctx.mkLt(t_1, t_0)), + 1, + null, null, null, null))), + 1, + null, null, null, null)); + */ + + //Constraint5send(politoIDS, n_0, p, t_0) -> p.proto == HTTP_REQ || p.protpo == HTTP_RESP + + this.constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0}, + ctx.mkImplies((BoolExpr)nctx.send.apply(politoIDS, n_0, p_0, t_0), + ctx.mkOr(ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.HTTP_REQUEST)), + ctx.mkEq(nctx.pf.get("proto").apply(p_0), ctx.mkInt(nctx.HTTP_RESPONSE)))), + 1, + null,null,null,null)); + + //Constraint6send(politoIDS, n_0, p, t_0) -> nodeHasAddr(politoIDS,p.src) + + this.constraints.add(ctx.mkForall(new Expr[]{n_0, p_0, t_0}, + ctx.mkImplies((BoolExpr)nctx.send.apply(politoIDS, n_0, p_0, t_0), + ctx.mkNot((BoolExpr)nctx.nodeHasAddr.apply(politoIDS,nctx.pf.get("src").apply(p_0)))), + 1, + null,null,null,null)); + + + + } + +} |