EvalURIObj.java

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/*
 * Autopsy Forensic Browser
 * 
 * Copyright 2013-2018 Basis Technology Corp.
 * Contact: carrier <at> sleuthkit <dot> org
 * 
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * 
 *     http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.sleuthkit.autopsy.modules.stix;

import org.sleuthkit.autopsy.casemodule.Case;
import org.sleuthkit.datamodel.SleuthkitCase;
import org.sleuthkit.datamodel.BlackboardArtifact;
import org.sleuthkit.datamodel.BlackboardAttribute;
import org.sleuthkit.datamodel.TskCoreException;

import java.util.List;
import java.util.ArrayList;
import org.mitre.cybox.common_2.ConditionApplicationEnum;

import org.mitre.cybox.objects.URIObjectType;
import org.sleuthkit.autopsy.casemodule.NoCurrentCaseException;

class EvalURIObj extends EvaluatableObject {

    private final URIObjectType obj;

    public EvalURIObj(URIObjectType a_obj, String a_id, String a_spacing) {
        obj = a_obj;
        id = a_id;
        spacing = a_spacing;
    }

    @Override
    public synchronized ObservableResult evaluate() {

        setWarnings("");

        if (obj.getValue() == null) {
            return new ObservableResult(id, "URIObject: No URI value field found", //NON-NLS
                    spacing, ObservableResult.ObservableState.INDETERMINATE, null);
        }

        Case case1;
        try {
            case1 = Case.getCurrentCaseThrows();
        } catch (NoCurrentCaseException ex) {
            return new ObservableResult(id, "Exception while getting open case: " + ex.getLocalizedMessage(), //NON-NLS
                    spacing, ObservableResult.ObservableState.FALSE, null);
        }

        String addressStr = obj.getValue().getValue().toString();

        // Strip off http:// or https://
        String modifiedAddressStr = addressStr.toLowerCase();
        modifiedAddressStr = modifiedAddressStr.replaceAll("http(s)?://", ""); //NON-NLS

        // Since we have single URL artifacts, ALL and NONE conditions probably don't make sense to test
        if (!((obj.getValue().getApplyCondition() == null)
                || (obj.getValue().getApplyCondition() == ConditionApplicationEnum.ANY))) {
            return new ObservableResult(id, "URIObject: Can not process apply condition " + obj.getValue().getApplyCondition().toString() //NON-NLS
                    + " on URI object", spacing, ObservableResult.ObservableState.INDETERMINATE, null); //NON-NLS
        }

        SleuthkitCase sleuthkitCase = case1.getSleuthkitCase();

        try {
            /*
             * if ((obj.getValue().getCondition() == null) ||
             * (obj.getValue().getCondition() == ConditionTypeEnum.EQUALS)) {
             *
             * // Old version - uses a database query but only works on full
             * strings. // It will be faster to use this in the "equals" case
             * String[] parts = addressStr.split("##comma##");
             * List<BlackboardArtifact> arts = new
             * ArrayList<BlackboardArtifact>(); for (String part : parts) {
             * arts.addAll(sleuthkitCase.getBlackboardArtifacts(
             * BlackboardArtifact.ARTIFACT_TYPE.TSK_KEYWORD_HIT,
             * BlackboardAttribute.ATTRIBUTE_TYPE.TSK_KEYWORD, part)); }
             *
             * if (!arts.isEmpty()) {
             *
             * List<StixArtifactData> artData = new
             * ArrayList<StixArtifactData>(); for (BlackboardArtifact a : arts)
             * { artData.add(new StixArtifactData(a.getObjectID(), id,
             * "URIObject")); }
             *
             * return new ObservableResult(id, "URIObject: Found " + arts.size()
             * + " matches for address = \"" + addressStr + "\"", spacing,
             * ObservableResult.ObservableState.TRUE, artData);
             *
             * } else { return new ObservableResult(id, "URIObject: Found no
             * matches for address = \"" + addressStr + "\"", spacing,
             * ObservableResult.ObservableState.FALSE, null); } } else {
             */

            // This is inefficient, but the easiest way to do it.
            List<BlackboardArtifact> finalHits = new ArrayList<BlackboardArtifact>();

            // Get all the URL artifacts
            List<BlackboardArtifact> artList
                    = sleuthkitCase.getBlackboardArtifacts(BlackboardArtifact.ARTIFACT_TYPE.TSK_KEYWORD_HIT);

            for (BlackboardArtifact art : artList) {

                for (BlackboardAttribute attr : art.getAttributes()) {
                    if (attr.getAttributeType().getTypeID() == BlackboardAttribute.ATTRIBUTE_TYPE.TSK_KEYWORD.getTypeID()) {

                        String modifiedAttrString = attr.getValueString();
                        if (modifiedAttrString != null) {
                            modifiedAttrString = modifiedAttrString.toLowerCase();
                            modifiedAttrString = modifiedAttrString.replaceAll("http(s)?://", ""); //NON-NLS
                        }

                        if (compareStringObject(modifiedAddressStr, obj.getValue().getCondition(),
                                obj.getValue().getApplyCondition(), modifiedAttrString)) {
                            finalHits.add(art);
                        }
                    }
                }
            }

            if (!finalHits.isEmpty()) {
                List<StixArtifactData> artData = new ArrayList<StixArtifactData>();
                for (BlackboardArtifact a : finalHits) {
                    artData.add(new StixArtifactData(a.getObjectID(), id, "UriObject")); //NON-NLS
                }
                return new ObservableResult(id, "UriObject: Found a match for " + addressStr, //NON-NLS
                        spacing, ObservableResult.ObservableState.TRUE, artData);
            }

            return new ObservableResult(id, "URIObject: Found no matches for " + addressStr, //NON-NLS
                    spacing, ObservableResult.ObservableState.FALSE, null);
            /*
             * }
             */

        } catch (TskCoreException ex) {
            return new ObservableResult(id, "URIObject: Exception during evaluation: " + ex.getLocalizedMessage(), //NON-NLS
                    spacing, ObservableResult.ObservableState.INDETERMINATE, null);
        }

    }

}