diff options
Diffstat (limited to 'verigraph/src/it/polito/verigraph/mcnet/netobjs/AclFirewall.java')
| -rw-r--r-- | verigraph/src/it/polito/verigraph/mcnet/netobjs/AclFirewall.java | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/verigraph/src/it/polito/verigraph/mcnet/netobjs/AclFirewall.java b/verigraph/src/it/polito/verigraph/mcnet/netobjs/AclFirewall.java new file mode 100644 index 0000000..63b2c6d --- /dev/null +++ b/verigraph/src/it/polito/verigraph/mcnet/netobjs/AclFirewall.java @@ -0,0 +1,123 @@ +/******************************************************************************* + * 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 com.microsoft.z3.Sort; + +import it.polito.verigraph.mcnet.components.NetContext; +import it.polito.verigraph.mcnet.components.Network; +import it.polito.verigraph.mcnet.components.NetworkObject; +import it.polito.verigraph.mcnet.components.Tuple; + +/** Represents a Firewall with the associated Access Control List + * + */ +public class AclFirewall extends NetworkObject{ + + List<BoolExpr> constraints; + Context ctx; + DatatypeExpr fw; + ArrayList<Tuple<DatatypeExpr,DatatypeExpr>> acls; + Network net; + NetContext nctx; + FuncDecl acl_func; + + public AclFirewall(Context ctx, Object[]... args) { + super(ctx, args); + } + + @Override + protected void init(Context ctx, Object[]... args) { + this.ctx = ctx; + isEndHost=false; + constraints = new ArrayList<BoolExpr>(); + acls = new ArrayList<Tuple<DatatypeExpr,DatatypeExpr>>(); + z3Node = ((NetworkObject)args[0][0]).getZ3Node(); + fw = z3Node; + net = (Network)args[0][1]; + nctx = (NetContext)args[0][2]; + net.saneSend(this); + firewallSendRules(); + + } + + /** + * Wrap add acls + * @param policy + */ + public void setPolicy(ArrayList<Tuple<DatatypeExpr, DatatypeExpr>> policy){ + addAcls(policy); + } + + public void addAcls(ArrayList<Tuple<DatatypeExpr,DatatypeExpr>> acls){ + this.acls.addAll(acls); + } + + @Override + public DatatypeExpr getZ3Node() { + return fw; + } + + + @Override + protected void addConstraints(Solver solver) { + BoolExpr[] constr = new BoolExpr[constraints.size()]; + solver.add(constraints.toArray(constr)); + aclConstraints(solver); + } + + private void firewallSendRules (){ + Expr p_0 = ctx.mkConst(fw+"_firewall_send_p_0", nctx.packet); + Expr n_0 = ctx.mkConst(fw+"_firewall_send_n_0", nctx.node); + Expr n_1 = ctx.mkConst(fw+"_firewall_send_n_1", nctx.node); + IntExpr t_0 = ctx.mkIntConst(fw+"_firewall_send_t_0"); + IntExpr t_1 = ctx.mkIntConst(fw+"_firewall_send_t_1"); + acl_func = ctx.mkFuncDecl(fw+"_acl_func", new Sort[]{nctx.address, nctx.address},ctx.mkBoolSort()); + + //Constraint1send(fw, n_0, p, t_0) -> (exist n_1,t_1 : (recv(n_1, fw, p, t_1) && + // t_1 < t_0 && !acl_func(p.src,p.dest)) + constraints.add( + ctx.mkForall(new Expr[]{n_0, p_0, t_0}, + ctx.mkImplies( + (BoolExpr)nctx.send.apply(new Expr[]{ fw, n_0, p_0, t_0}), + ctx.mkExists(new Expr[]{t_1}, + ctx.mkAnd(ctx.mkLt(t_1,t_0), + ctx.mkExists(new Expr[]{n_1}, + nctx.recv.apply(n_1, fw, p_0, t_1),1,null,null,null,null), + ctx.mkNot((BoolExpr)acl_func.apply(nctx.pf.get("src").apply(p_0), nctx.pf.get("dest").apply(p_0)))),1,null,null,null,null)),1,null,null,null,null)); + + } + + private void aclConstraints(Solver solver){ + if (acls.size() == 0) + return; + Expr a_0 = ctx.mkConst(fw+"_firewall_acl_a_0", nctx.address); + Expr a_1 = ctx.mkConst(fw+"_firewall_acl_a_1", nctx.address); + BoolExpr[] acl_map = new BoolExpr[acls.size()]; + for(int y=0;y<acls.size();y++){ + Tuple<DatatypeExpr,DatatypeExpr> tp = acls.get(y); + acl_map[y] = ctx.mkOr(ctx.mkAnd(ctx.mkEq(a_0,tp._1),ctx.mkEq(a_1,tp._2)), ctx.mkAnd(ctx.mkEq(a_0,tp._2),ctx.mkEq(a_1,tp._1))); + } + //Constraint2acl_func(a_0,a_1) == or(foreach ip1,ip2 in acl_map ((a_0 == ip1 && a_1 == ip2)||(a_0 == ip2 && a_1 == ip1))) + solver.add(ctx.mkForall(new Expr[]{a_0, a_1}, + ctx.mkEq( + acl_func.apply(a_0, a_1), + ctx.mkOr(acl_map)),1,null,null,null,null)); + } +}
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