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 Inc.
6 * ================================================================================
7 * Licensed under the Apache License, Version 2.0 (the "License");
8 * you may not use this file except in compliance with the License.
9 * You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
19 * SPDX-License-Identifier: Apache-2.0
20 * ============LICENSE_END=========================================================
23 package org.onap.policy.distribution.reception.decoding.policy.file;
25 import java.io.IOException;
26 import java.nio.file.Path;
27 import java.util.ArrayList;
28 import java.util.Collection;
29 import java.util.Enumeration;
30 import java.util.zip.ZipEntry;
31 import java.util.zip.ZipFile;
32 import org.onap.policy.common.parameters.ParameterService;
33 import org.onap.policy.common.utils.coder.CoderException;
34 import org.onap.policy.common.utils.coder.StandardCoder;
35 import org.onap.policy.common.utils.coder.StandardYamlCoder;
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 StandardYamlCoder yamlCoder;
53 private static final long MAX_FILE_SIZE = 512L * 1024;
59 public void configure(final String parameterGroupName) {
60 decoderParameters = ParameterService.get(parameterGroupName);
61 coder = new StandardCoder();
62 yamlCoder = new StandardYamlCoder();
69 public boolean canHandle(final PolicyInput policyInput) {
70 return policyInput.getClass().isAssignableFrom(Csar.class);
77 public Collection<ToscaEntity> decode(final Csar csar) throws PolicyDecodingException {
78 final Collection<ToscaEntity> policyList = new ArrayList<>();
80 try (ZipFile zipFile = new ZipFile(csar.getCsarPath())) {
81 final Enumeration<? extends ZipEntry> entries = zipFile.entries();
82 while (entries.hasMoreElements()) {
84 // Sonar will flag this as a Security Hotspot
85 // "Expanding archive files is security-sensitive"
86 // isZipEntryValid ensures the file being read exists in the archive
88 final ZipEntry entry = entries.nextElement(); // NOSONAR
89 if (isZipEntryValid(entry.getName(), csar.getCsarPath(), entry.getSize())) {
90 final ToscaServiceTemplate policy =
91 decodeFile(zipFile, entry);
92 policyList.add(policy);
95 } catch (final IOException | CoderException exp) {
96 throw new PolicyDecodingException("Failed decoding the policy", exp);
103 * Method to filter out Policy type and Policy files. In addition,
104 * ensures validation of entries in the Zipfile. Attempts to solve path
105 * injection java security issues.
107 * @param entry the ZipEntry to check
108 * @param csarPath Absolute path to the csar the ZipEntry is in
109 * @return true if no injection detected, and it is a policy type or policy file.
110 * @throws PolicyDecodingException if the file size is too large
112 private boolean isZipEntryValid(String entryName, String csarPath, long entrySize) throws PolicyDecodingException {
114 // We only care about policy types and policies
116 if (entryName.contains(decoderParameters.getPolicyTypeFileName())
117 || entryName.contains(decoderParameters.getPolicyFileName())) {
121 if (entrySize > MAX_FILE_SIZE) {
122 throw new PolicyDecodingException("Zip entry for " + entryName + " is too large " + entrySize);
125 // Now ensure that there is no path injection
127 Path path = Path.of(csarPath, entryName).normalize();
129 // Throw an exception if path is outside the csar
131 if (! path.startsWith(csarPath)) {
132 throw new PolicyDecodingException("Potential path injection for zip entry " + entryName);
141 * Method to decode either a json or yaml file into an object.
143 * @param zipFile the zip file
144 * @param entry the entry to read in the zip file.
145 * @return the decoded ToscaServiceTemplate object.
146 * @throws CoderException IOException if the file decoding fails.
148 private ToscaServiceTemplate decodeFile(ZipFile zipFile, final ZipEntry entry) throws IOException, CoderException {
149 ToscaServiceTemplate policy = null;
150 if (entry.getName().endsWith(".json")) {
151 policy = coder.decode(zipFile.getInputStream(entry), ToscaServiceTemplate.class);
152 } else if (entry.getName().endsWith(".yaml")) {
153 policy = yamlCoder.decode(zipFile.getInputStream(entry), ToscaServiceTemplate.class);