2 * ============LICENSE_START=======================================================
3 * Copyright (C) 2018 Ericsson. All rights reserved.
4 * Copyright (C) 2019 Nordix Foundation.
5 * Modifications Copyright (C) 2020-2021 AT&T Intellectual Property. All rights reserved.
6 * Modifications Copyright (C) 2021 Bell Canada. All rights reserved.
7 * ================================================================================
8 * Licensed under the Apache License, Version 2.0 (the "License");
9 * you may not use this file except in compliance with the License.
10 * You may obtain a copy of the License at
12 * http://www.apache.org/licenses/LICENSE-2.0
14 * Unless required by applicable law or agreed to in writing, software
15 * distributed under the License is distributed on an "AS IS" BASIS,
16 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17 * See the License for the specific language governing permissions and
18 * limitations under the License.
20 * SPDX-License-Identifier: Apache-2.0
21 * ============LICENSE_END=========================================================
24 package org.onap.policy.distribution.reception.decoding.policy.file;
26 import java.io.IOException;
27 import java.nio.file.Path;
28 import java.util.ArrayList;
29 import java.util.Collection;
30 import java.util.Enumeration;
31 import java.util.zip.ZipEntry;
32 import java.util.zip.ZipFile;
33 import org.onap.policy.common.parameters.ParameterService;
34 import org.onap.policy.common.utils.coder.CoderException;
35 import org.onap.policy.common.utils.coder.StandardCoder;
36 import org.onap.policy.distribution.model.Csar;
37 import org.onap.policy.distribution.model.PolicyInput;
38 import org.onap.policy.distribution.reception.decoding.PolicyDecoder;
39 import org.onap.policy.distribution.reception.decoding.PolicyDecodingException;
40 import org.onap.policy.models.tosca.authorative.concepts.ToscaEntity;
41 import org.onap.policy.models.tosca.authorative.concepts.ToscaServiceTemplate;
44 * This class extracts policy files from a CSAR file.
46 * @author Ram Krishna Verma (ram.krishna.verma@ericsson.com)
48 public class PolicyDecoderFileInCsarToPolicy implements PolicyDecoder<Csar, ToscaEntity> {
50 private PolicyDecoderFileInCsarToPolicyParameterGroup decoderParameters;
51 private StandardCoder coder;
52 private static final long MAX_FILE_SIZE = 512L * 1024;
58 public void configure(final String parameterGroupName) {
59 decoderParameters = ParameterService.get(parameterGroupName);
60 coder = new StandardCoder();
67 public boolean canHandle(final PolicyInput policyInput) {
68 return policyInput.getClass().isAssignableFrom(Csar.class);
75 public Collection<ToscaEntity> decode(final Csar csar) throws PolicyDecodingException {
76 final Collection<ToscaEntity> policyList = new ArrayList<>();
78 try (var zipFile = new ZipFile(csar.getCsarFilePath())) {
79 final Enumeration<? extends ZipEntry> entries = zipFile.entries();
80 while (entries.hasMoreElements()) {
82 // Sonar will flag this as a Security Hotspot
83 // "Expanding archive files is security-sensitive"
84 // isZipEntryValid ensures the file being read exists in the archive
86 final ZipEntry entry = entries.nextElement(); // NOSONAR
87 if (isZipEntryValid(entry.getName(), csar.getCsarFilePath(), entry.getSize())) {
88 final ToscaServiceTemplate policy =
89 coder.decode(zipFile.getInputStream(entry), ToscaServiceTemplate.class);
90 policyList.add(policy);
93 } catch (final IOException | CoderException exp) {
94 throw new PolicyDecodingException("Failed decoding the policy", exp);
101 * Method to filter out Policy type and Policy files. In addition,
102 * ensures validation of entries in the Zipfile. Attempts to solve path
103 * injection java security issues.
105 * @param entryName name of the ZipEntry to check
106 * @param csarPath Absolute path to the csar the ZipEntry is in
107 * @param entrySize size of the ZipEntry
108 * @return true if no injection detected, and it is a policy type or policy file.
109 * @throws PolicyDecodingException if the file size is too large
111 private boolean isZipEntryValid(String entryName, String csarPath, long entrySize) throws PolicyDecodingException {
113 // We only care about policy types and policies
115 if (entryName.contains(decoderParameters.getPolicyTypeFileName())
116 || entryName.contains(decoderParameters.getPolicyFileName())) {
120 if (entrySize > MAX_FILE_SIZE) {
121 throw new PolicyDecodingException("Zip entry for " + entryName + " is too large " + entrySize);
124 // Now ensure that there is no path injection
126 var path = Path.of(csarPath, entryName).normalize();
128 // Throw an exception if path is outside the csar
130 if (! path.startsWith(csarPath)) {
131 throw new PolicyDecodingException("Potential path injection for zip entry " + entryName);