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/*-
* ============LICENSE_START=======================================================
* ONAP-PDP-REST
* ================================================================================
* Copyright (C) 2017-2019 AT&T Intellectual Property. All rights reserved.
* ================================================================================
* 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.
* ============LICENSE_END=========================================================
*/
package org.onap.policy.pdp.rest.config;
import com.att.research.xacml.util.XACMLProperties;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Base64;
import java.util.Collections;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import org.onap.policy.api.PolicyEngineException;
import org.onap.policy.common.logging.eelf.MessageCodes;
import org.onap.policy.common.logging.flexlogger.FlexLogger;
import org.onap.policy.common.logging.flexlogger.Logger;
import org.onap.policy.rest.XACMLRestProperties;
import org.onap.policy.utils.AAFPolicyClient;
import org.onap.policy.utils.AAFPolicyException;
import org.onap.policy.utils.PeCryptoUtils;
import org.onap.policy.utils.PolicyUtils;
import org.onap.policy.xacml.api.XACMLErrorConstants;
public class PDPApiAuth {
private static final Logger LOGGER = FlexLogger.getLogger(PDPApiAuth.class);
private static String environment = null;
private static Path clientPath = null;
private static Map<String, ArrayList<String>> clientMap = null;
private static Long oldModified = null;
private static AAFPolicyClient aafClient = null;
private PDPApiAuth() {
// Private Constructor
}
/*
* Set Property by reading the properties File.
*/
public static void setProperty() {
environment = XACMLProperties.getProperty("ENVIRONMENT", "DEVL");
String clientFile = XACMLProperties.getProperty(XACMLRestProperties.PROP_PEP_IDFILE);
if (clientFile != null) {
clientPath = Paths.get(clientFile);
}
try {
aafClient = AAFPolicyClient.getInstance(XACMLProperties.getProperties());
} catch (AAFPolicyException | IOException e) {
LOGGER.error(MessageCodes.ERROR_SYSTEM_ERROR, e, "AAF Client Not instantiated properly.");
}
}
/*
* Return Environment value of the PDP servlet.
*/
public static String getEnvironment() {
if (environment == null) {
setProperty();
}
return environment;
}
/*
* Security check for authentication and authorizations.
*/
public static boolean checkPermissions(String clientEncoding, String requestID, String resource) {
try {
String[] userNamePass = PolicyUtils.decodeBasicEncoding(clientEncoding);
if (userNamePass == null || userNamePass.length == 0) {
String usernameAndPassword = null;
byte[] decodedBytes = Base64.getDecoder().decode(clientEncoding);
usernameAndPassword = new String(decodedBytes, "UTF-8");
StringTokenizer tokenizer = new StringTokenizer(usernameAndPassword, ":");
String username = tokenizer.nextToken();
String password = tokenizer.nextToken();
userNamePass = new String[] {username, password};
}
LOGGER.info("User " + userNamePass[0] + " is Accessing Policy Engine API.");
Boolean result = false;
// Check Backward Compatibility.
try {
/*
* If AAF is NOT enabled in the properties we will allow the user to continue to use the
* client.properties file to authenticate. Note: Disabling AAF is for testing purposes and not intended
* for production.
*/
if ("false".equals(XACMLProperties.getProperty("enable_aaf"))) {
result = clientAuth(userNamePass);
}
} catch (Exception e) {
LOGGER.error(MessageCodes.ERROR_PERMISSIONS, e);
}
if (!result) {
String aafPolicyNameSpace = XACMLProperties.getProperty("policy.aaf.namespace");
String aafResource = XACMLProperties.getProperty("policy.aaf.root.permission");
String type = null;
if (!userNamePass[0].contains("@") && aafPolicyNameSpace != null) {
userNamePass[0] = userNamePass[0] + "@" + reverseNamespace(aafPolicyNameSpace);
} else {
LOGGER.info("No AAF NameSpace specified in properties");
}
if (aafResource != null) {
type = aafResource + "." + resource;
} else {
LOGGER.warn("No AAF Resource specified in properties");
return false;
}
LOGGER.info("Contacting AAF in : " + environment);
result = aafClient.checkAuthPerm(userNamePass[0], userNamePass[1], type, environment, "*");
}
return result;
} catch (Exception e) {
LOGGER.error(MessageCodes.ERROR_PERMISSIONS, e);
return false;
}
}
private static Boolean clientAuth(String[] userNamePass) {
if (clientPath == null) {
setProperty();
}
if (!clientPath.toFile().exists()) {
return false;
} else if (clientPath.toString().endsWith(".properties")) {
try {
readProps(clientPath);
if (clientMap.containsKey(userNamePass[0])
&& clientMap.get(userNamePass[0]).get(0).equals(userNamePass[1])) {
return true;
}
} catch (PolicyEngineException e) {
LOGGER.error(MessageCodes.ERROR_PERMISSIONS, e);
return false;
}
}
return false;
}
private static String reverseNamespace(String namespace) {
final List<String> components = Arrays.asList(namespace.split("\\."));
Collections.reverse(components);
return String.join(".", components);
}
private static Map<String, ArrayList<String>> readProps(Path clientPath) throws PolicyEngineException {
if (oldModified != null) {
Long newModified = clientPath.toFile().lastModified();
if (newModified == oldModified) {
return clientMap;
}
}
InputStream in;
Properties clientProp = new Properties();
try {
in = new FileInputStream(clientPath.toFile());
clientProp.load(in);
} catch (IOException e) {
LOGGER.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR, e);
throw new PolicyEngineException(XACMLErrorConstants.ERROR_SYSTEM_ERROR + "Cannot Load the Properties file",
e);
}
// Read the Properties and Load the Clients and their scopes.
clientMap = new HashMap<>();
//
for (Object propKey : clientProp.keySet()) {
String clientID = (String) propKey;
String clientValue = clientProp.getProperty(clientID);
if (clientValue != null && clientValue.contains(",")) {
ArrayList<String> clientValues = new ArrayList<>(Arrays.asList(clientValue.split("\\s*,\\s*")));
if (clientValues.get(0) != null || clientValues.get(1) != null || clientValues.get(0).isEmpty()
|| clientValues.get(1).isEmpty()) {
clientValues.set(0, PeCryptoUtils.decrypt(clientValues.get(0)));
clientMap.put(clientID, clientValues);
}
}
}
if (clientMap.isEmpty()) {
LOGGER.debug(XACMLErrorConstants.ERROR_PERMISSIONS
+ "No Clients ID , Client Key and Scopes are available. Cannot serve any Clients !!");
throw new PolicyEngineException("Empty Client file");
}
oldModified = clientPath.toFile().lastModified();
return clientMap;
}
}
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