ECOMP-PDP-REST/src/main/java/org/openecomp/policy/pdp/rest/config/PDPApiAuth.java

   1 /*-
   2  * ============LICENSE_START=======================================================
   3  * ECOMP-PDP-REST
   4  * ================================================================================
   5  * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
   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
  10  *
  11  *      http://www.apache.org/licenses/LICENSE-2.0
  12  *
  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.
  18  * ============LICENSE_END=========================================================
  19  */
  20 package org.openecomp.policy.pdp.rest.config;
  21
  22 import java.io.FileInputStream;
  23 import java.io.IOException;
  24 import java.io.InputStream;
  25 import java.nio.file.Files;
  26 import java.nio.file.Path;
  27 import java.nio.file.Paths;
  28 import java.util.ArrayList;
  29 import java.util.Arrays;
  30 import java.util.Base64;
  31 import java.util.HashMap;
  32 import java.util.Map;
  33 import java.util.Properties;
  34 import java.util.StringTokenizer;
  35
  36 import org.openecomp.policy.api.PolicyEngineException;
  37 import org.openecomp.policy.common.logging.eelf.MessageCodes;
  38 import org.openecomp.policy.common.logging.eelf.PolicyLogger;
  39 import org.openecomp.policy.rest.XACMLRestProperties;
  40 import org.openecomp.policy.utils.AAFPolicyClient;
  41 import org.openecomp.policy.utils.AAFPolicyException;
  42 import org.openecomp.policy.utils.PolicyUtils;
  43 import org.openecomp.policy.xacml.api.XACMLErrorConstants;
  44
  45 import com.att.research.xacml.util.XACMLProperties;
  46
  47 public class PDPApiAuth {
  48          private static String environment = null;
  49             private static Path clientPath = null;
  50             private static Map<String,ArrayList<String>> clientMap = null;
  51             private static Long oldModified = null;
  52             private static AAFPolicyClient aafClient = null;
  53
  54             /*
  55              * Set Property by reading the properties File.
  56              */
  57             public static void setProperty() {
  58                 environment = XACMLProperties.getProperty("ENVIRONMENT", "DEVL");
  59                 String clientFile = XACMLProperties.getProperty(XACMLRestProperties.PROP_PEP_IDFILE);
  60                 if(clientFile!=null){
  61                     clientPath = Paths.get(clientFile);
  62                 }
  63                 try {
  64                     aafClient = AAFPolicyClient.getInstance(XACMLProperties.getProperties());
  65                 } catch (AAFPolicyException | IOException e) {
  66                     PolicyLogger.error(MessageCodes.ERROR_SYSTEM_ERROR, e, "AAF Client Not instantiated properly.");
  67                 }
  68             }
  69
  70             /*
  71              * Return Environment value of the PDP servlet.
  72              */
  73             public static String getEnvironment() {
  74                 if(environment==null){
  75                     setProperty();
  76                 }
  77                 return environment;
  78             }
  79
  80             /*
  81              * Security check for authentication and authorizations.
  82              */
  83             public static boolean checkPermissions(String clientEncoding, String requestID,
  84                     String resource) {
  85                 try{
  86                     String[] userNamePass = PolicyUtils.decodeBasicEncoding(clientEncoding);
  87                     if(userNamePass==null){
  88                         String usernameAndPassword = null;
  89                         byte[] decodedBytes = Base64.getDecoder().decode(clientEncoding);
  90                         usernameAndPassword = new String(decodedBytes, "UTF-8");
  91                         StringTokenizer tokenizer = new StringTokenizer(usernameAndPassword, ":");
  92                         String username = tokenizer.nextToken();
  93                         String password = tokenizer.nextToken();
  94                         userNamePass=  new String[]{username, password};
  95                     }
  96                     PolicyLogger.info("User " + userNamePass[0] + " is Accessing Policy Engine API.");
  97                     Boolean result = false;
  98                     // Check Backward Compatibility.
  99                     try{
 100                         result = clientAuth(userNamePass);
 101                     }catch(Exception e){
 102                         PolicyLogger.error(MessageCodes.ERROR_PERMISSIONS, e, "");
 103                     }
 104                     if(!result){
 105                         try{
 106                                 String aafPolicyNameSpace = XACMLProperties.getProperty("policy.aaf.namespace");
 107                                 String aafResource = XACMLProperties.getProperty("policy.aaf.resource");
 108                             if(!userNamePass[0].contains("@") && aafPolicyNameSpace!= null){
 109                                 userNamePass[0] = userNamePass[0] + "@" + aafPolicyNameSpace;
 110                             }
 111                             if(aafResource != null){
 112                                  resource = aafResource + resource;
 113                             }
 114                             PolicyLogger.info("Contacting AAF in : "  + environment);
 115                             result = aafClient.checkAuthPerm(userNamePass[0], userNamePass[1], resource, environment, ".*");
 116                         }catch (NullPointerException e){
 117                             result = false;
 118                         }
 119                     }
 120                     return result;
 121                 }catch(Exception e){
 122                     PolicyLogger.error(MessageCodes.ERROR_PERMISSIONS, e, "");
 123                     return false;
 124                 }
 125             }
 126
 127             private static Boolean clientAuth(String[] userNamePass) throws Exception{
 128                 if(clientPath==null){
 129                     setProperty();
 130                 }
 131                 if (Files.notExists(clientPath)) {
 132                     return false;
 133                 }else if(clientPath.toString().endsWith(".properties")) {
 134                     try {
 135                         readProps(clientPath);
 136                         if (clientMap.containsKey(userNamePass[0]) && clientMap.get(userNamePass[0]).get(0).equals(userNamePass[1])) {
 137                             return true;
 138                         }
 139                     }catch(PolicyEngineException e){
 140                         return false;
 141                     }
 142                 }
 143                 return false;
 144             }
 145
 146             private static Map<String, ArrayList<String>> readProps(Path clientPath) throws PolicyEngineException{
 147                 if(oldModified!=null){
 148                     Long newModified = clientPath.toFile().lastModified();
 149                     if (newModified == oldModified) {
 150                         return clientMap;
 151                     }
 152                 }
 153                 InputStream in;
 154                 Properties clientProp = new Properties();
 155                 try {
 156                     in = new FileInputStream(clientPath.toFile());
 157                     clientProp.load(in);
 158                 } catch (IOException e) {
 159                     PolicyLogger.error(XACMLErrorConstants.ERROR_SYSTEM_ERROR + e);
 160                     throw new PolicyEngineException(XACMLErrorConstants.ERROR_SYSTEM_ERROR +"Cannot Load the Properties file", e);
 161                 }
 162                 // Read the Properties and Load the Clients and their scopes.
 163                 clientMap = new HashMap<>();
 164                 //
 165                 for (Object propKey : clientProp.keySet()) {
 166                     String clientID = (String)propKey;
 167                     String clientValue = clientProp.getProperty(clientID);
 168                     if (clientValue != null) {
 169                         if (clientValue.contains(",")) {
 170                             ArrayList<String> clientValues = new ArrayList<String>(Arrays.asList(clientValue.split("\\s*,\\s*")));
 171                             if(clientValues.get(0)!=null || clientValues.get(1)!=null || clientValues.get(0).isEmpty() || clientValues.get(1).isEmpty()){
 172                                 clientMap.put(clientID, clientValues);
 173                             }
 174                         }
 175                     }
 176                 }
 177                 if (clientMap.isEmpty()) {
 178                     PolicyLogger.debug(XACMLErrorConstants.ERROR_PERMISSIONS + "No Clients ID , Client Key and Scopes are available. Cannot serve any Clients !!");
 179                     throw new PolicyEngineException("Empty Client file");
 180                 }
 181                 oldModified = clientPath.toFile().lastModified();
 182                 return clientMap;
 183             }
 184 }