core/src/main/java/com/att/cadi/filter/CadiFilter.java

   1 /*******************************************************************************\r
   2  * ============LICENSE_START====================================================\r
   3  * * org.onap.aai\r
   4  * * ===========================================================================\r
   5  * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.\r
   6  * * Copyright © 2017 Amdocs\r
   7  * * ===========================================================================\r
   8  * * Licensed under the Apache License, Version 2.0 (the "License");\r
   9  * * you may not use this file except in compliance with the License.\r
  10  * * You may obtain a copy of the License at\r
  11  * * \r
  12  *  *      http://www.apache.org/licenses/LICENSE-2.0\r
  13  * * \r
  14  *  * Unless required by applicable law or agreed to in writing, software\r
  15  * * distributed under the License is distributed on an "AS IS" BASIS,\r
  16  * * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
  17  * * See the License for the specific language governing permissions and\r
  18  * * limitations under the License.\r
  19  * * ============LICENSE_END====================================================\r
  20  * *\r
  21  * * ECOMP is a trademark and service mark of AT&T Intellectual Property.\r
  22  * *\r
  23  ******************************************************************************/\r
  24 package com.att.cadi.filter;\r
  25 \r
  26 import java.io.IOException;\r
  27 import java.lang.reflect.Constructor;\r
  28 import java.util.ArrayList;\r
  29 import java.util.List;\r
  30 \r
  31 import javax.servlet.Filter;\r
  32 import javax.servlet.FilterChain;\r
  33 import javax.servlet.FilterConfig;\r
  34 import javax.servlet.ServletException;\r
  35 import javax.servlet.ServletRequest;\r
  36 import javax.servlet.ServletResponse;\r
  37 import javax.servlet.http.HttpServletRequest;\r
  38 import javax.servlet.http.HttpServletResponse;\r
  39 \r
  40 import com.att.cadi.Access;\r
  41 import com.att.cadi.Access.Level;\r
  42 import com.att.cadi.CadiException;\r
  43 import com.att.cadi.CadiWrap;\r
  44 import com.att.cadi.Lur;\r
  45 import com.att.cadi.PropAccess;\r
  46 import com.att.cadi.ServletContextAccess;\r
  47 import com.att.cadi.TrustChecker;\r
  48 import com.att.cadi.config.Config;\r
  49 import com.att.cadi.config.Get;\r
  50 import com.att.cadi.taf.TafResp;\r
  51 import com.att.cadi.taf.TafResp.RESP;\r
  52 \r
  53 /**\r
  54  * CadiFilter\r
  55  * \r
  56  * This class implements Servlet Filter, and ties together CADI implementations\r
  57  * \r
  58  * This class can be used in a standard J2EE Servlet manner.  Optimal usage is for POJO operations, where\r
  59  * one can enforce this Filter being first and primary.  Depending on the Container, it \r
  60  * may be more effective, in some cases, to utilize features that allow earlier determination of \r
  61  * AUTHN (Authorization).  An example would be "Tomcat Valve".  These implementations, however, should\r
  62  * be modeled after the "init" and "doFilter" functions, and be kept up to date as this class changes.\r
  63  * \r
  64  * \r
  65  *\r
  66  */\r
  67 public class CadiFilter implements Filter {\r
  68         private static CadiHTTPManip httpChecker;\r
  69         private static String[] pathExceptions;\r
  70         private static List<Pair> mapPairs;\r
  71         private Access access;\r
  72         private Object[] additionalTafLurs;\r
  73         private static int count=0;\r
  74         \r
  75         public Lur getLur() {\r
  76                 return httpChecker.getLur();\r
  77         }\r
  78         \r
  79         /**\r
  80          * Construct a viable Filter\r
  81          * \r
  82          * Due to the vagaries of many containers, there is a tendency to create Objects and call "Init" on \r
  83          * them at a later time.  Therefore, this object creates with an object that denies all access\r
  84          * until appropriate Init happens, just in case the container lets something slip by in the meantime.\r
  85          * \r
  86          */\r
  87         public CadiFilter() {\r
  88                 additionalTafLurs = CadiHTTPManip.noAdditional;\r
  89         }\r
  90 \r
  91         /**\r
  92          * This constructor to be used when directly constructing and placing in HTTP Engine\r
  93          * \r
  94          * @param access\r
  95          * @param moreTafLurs\r
  96          * @throws ServletException \r
  97          */\r
  98         public CadiFilter(Access access, Object ... moreTafLurs) throws ServletException {\r
  99                 additionalTafLurs = moreTafLurs;\r
 100                 init(new AccessGetter(this.access = access));\r
 101         }\r
 102 \r
 103 \r
 104         /**\r
 105          * Use this to pass in a PreContructed CADI Filter, but with initializing... let Servlet do it\r
 106          * @param init\r
 107          * @param access\r
 108          * @param moreTafLurs\r
 109          * @throws ServletException\r
 110          */\r
 111         public CadiFilter(boolean init, PropAccess access, Object ... moreTafLurs) throws ServletException {\r
 112                 this.access = access;\r
 113                 if(init) {\r
 114                         init(new AccessGetter(access));\r
 115                 }\r
 116                 additionalTafLurs = moreTafLurs;\r
 117         }\r
 118 \r
 119         /**\r
 120          * Init\r
 121          * \r
 122          * Standard Filter "init" call with FilterConfig to obtain properties.  POJOs can construct a\r
 123          * FilterConfig with the mechanism of their choice, and standard J2EE Servlet engines utilize this\r
 124          * mechanism already.\r
 125          */\r
 126         //TODO Always validate changes against Tomcat AbsCadiValve and Jaspi CadiSAM Init functions\r
 127         public void init(FilterConfig filterConfig) throws ServletException {\r
 128                 // need the Context for Logging, instantiating ClassLoader, etc\r
 129                 ServletContextAccess sca=new ServletContextAccess(filterConfig); \r
 130                 if(access==null) {\r
 131                         access = sca;\r
 132                 }\r
 133                 \r
 134                 // Set Protected getter with base Access, for internal class instantiations\r
 135                 init(new FCGet(access, sca.context(), filterConfig));\r
 136         }\r
 137         \r
 138 \r
 139    private void init(Get getter) throws ServletException {\r
 140         // Start with the assumption of "Don't trust anyone".\r
 141            TrustChecker tc = TrustChecker.NOTRUST; // default position\r
 142            try {\r
 143                    @SuppressWarnings("unchecked")\r
 144                    Class<TrustChecker> ctc = (Class<TrustChecker>) Class.forName("com.att.cadi.aaf.v2_0.AAFTrustChecker");\r
 145                    if(ctc!=null) {\r
 146                            Constructor<TrustChecker> contc = ctc.getConstructor(Access.class);\r
 147                            if(contc!=null) {\r
 148                                    tc = contc.newInstance(access);\r
 149                            }\r
 150                    }\r
 151            } catch (Exception e) {\r
 152                    access.log(Level.INIT, "AAFTrustChecker cannot be loaded",e.getMessage());\r
 153            }\r
 154        \r
 155         \r
 156         // Synchronize, because some instantiations call init several times on the same object\r
 157         // In this case, the epiTaf will be changed to a non-NullTaf, and thus not instantiate twice.\r
 158                 synchronized(CadiHTTPManip.noAdditional /*will always remain same Object*/) {\r
 159                         ++count;\r
 160                         if(httpChecker == null) {\r
 161                                 if(access==null) {\r
 162                                         access = new PropAccess();\r
 163                                 }\r
 164                                 try {\r
 165                                         httpChecker = new CadiHTTPManip(access,null /*reuseable Con*/,tc, additionalTafLurs);\r
 166                                 } catch (CadiException e1) {\r
 167                                         throw new ServletException(e1);\r
 168                                 }\r
 169                         } else if(access==null) {\r
 170                                 access= httpChecker.getAccess();\r
 171                         }\r
 172 \r
 173                         /*\r
 174                          * Setup Authn Path Exceptions\r
 175                          */\r
 176                         if(pathExceptions==null) {\r
 177                                 String str = getter.get(Config.CADI_NOAUTHN, null, true);\r
 178                                 if(str!=null) {\r
 179                                         pathExceptions = str.split("\\s*:\\s*");\r
 180                                 }\r
 181                         }\r
 182         \r
 183                         /* \r
 184                          * SETUP Permission Converters... those that can take Strings from a Vendor Product, and convert to appropriate AAF Permissions\r
 185                          */\r
 186                         if(mapPairs==null) {\r
 187                                 String str = getter.get(Config.AAF_PERM_MAP, null, true);\r
 188                                 if(str!=null) {\r
 189                                         String mstr = getter.get(Config.AAF_PERM_MAP, null, true);\r
 190                                         if(mstr!=null) {\r
 191                                                 String map[] = mstr.split("\\s*:\\s*");\r
 192                                                 if(map.length>0) {\r
 193                                                         MapPermConverter mpc=null;\r
 194                                                         int idx;\r
 195                                                         mapPairs = new ArrayList<Pair>();\r
 196                                                         for(String entry : map) {\r
 197                                                                 if((idx=entry.indexOf('='))<0) { // it's a Path, so create a new converter\r
 198                                                                         access.log(Level.INIT,"Loading Perm Conversions for:",entry);\r
 199                                                                         mapPairs.add(new Pair(entry,mpc=new MapPermConverter()));\r
 200                                                                 } else {\r
 201                                                                         if(mpc!=null) {\r
 202                                                                                 mpc.map().put(entry.substring(0,idx),entry.substring(idx+1));\r
 203                                                                         } else {\r
 204                                                                                 access.log(Level.ERROR,"cadi_perm_map is malformed; ",entry, "is skipped");\r
 205                                                                         }\r
 206                                                                 }\r
 207                                                         }\r
 208                                                 }\r
 209                                         }\r
 210                                 }\r
 211                         }\r
 212                 }\r
 213 \r
 214                 // Remove Getter\r
 215         getter = Get.NULL;\r
 216         }\r
 217 \r
 218         /**\r
 219          * Containers call "destroy" when time to cleanup \r
 220          */\r
 221         public void destroy() {\r
 222                 // Synchronize, in case multiCadiFilters are used.\r
 223                 synchronized(CadiHTTPManip.noAdditional) {\r
 224                         if(--count<=0 && httpChecker!=null) {\r
 225                                 httpChecker.destroy();\r
 226                                 httpChecker=null;\r
 227                                 access=null;\r
 228                                 pathExceptions=null;\r
 229                         }\r
 230                 }\r
 231         }\r
 232 \r
 233         /**\r
 234          * doFilter\r
 235          * \r
 236          * This is the standard J2EE invocation.  Analyze the request, modify response as necessary, and\r
 237          * only call the next item in the filterChain if request is suitably Authenticated.\r
 238          */\r
 239         //TODO Always validate changes against Tomcat AbsCadiValve and Jaspi CadiSAM functions\r
 240         public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException, ServletException {\r
 241                 try {\r
 242                         HttpServletRequest hreq = (HttpServletRequest)request;\r
 243                         if(noAuthn(hreq)) {\r
 244                                 chain.doFilter(request, response);\r
 245                         } else {\r
 246                                 HttpServletResponse hresp = (HttpServletResponse)response;\r
 247                                 TafResp tresp = httpChecker.validate(hreq, hresp);\r
 248                                 if(tresp.isAuthenticated()==RESP.IS_AUTHENTICATED) {\r
 249                                                 CadiWrap cw = new CadiWrap(hreq, tresp, httpChecker.getLur(),getConverter(hreq));\r
 250                                                 if(httpChecker.notCadi(cw, hresp)) {\r
 251                                                         chain.doFilter(cw,response);\r
 252                                                 }\r
 253                                 }                                               \r
 254                         }\r
 255                 } catch (ClassCastException e) {\r
 256                         throw new ServletException("CadiFilter expects Servlet to be an HTTP Servlet",e);\r
 257                 }\r
 258         }\r
 259 \r
 260 \r
 261         /** \r
 262          * If PathExceptions exist, report if these should not have Authn applied.\r
 263          * @param hreq\r
 264          * @return\r
 265          */\r
 266         private boolean noAuthn(HttpServletRequest hreq) {\r
 267                 if(pathExceptions!=null) {\r
 268                         String pi = hreq.getPathInfo();\r
 269                         if(pi==null) return false; // JBoss sometimes leaves null\r
 270                         for(String pe : pathExceptions) {\r
 271                                 if(pi.startsWith(pe))return true;\r
 272                         }\r
 273                 }\r
 274                 return false;\r
 275         }\r
 276         \r
 277         /**\r
 278          * Get Converter by Path\r
 279          */\r
 280         private PermConverter getConverter(HttpServletRequest hreq) {\r
 281                 if(mapPairs!=null) {\r
 282                         String pi = hreq.getPathInfo();\r
 283                         if(pi!=null) {\r
 284                         for(Pair p: mapPairs) {\r
 285                                 if(pi.startsWith(p.name))return p.pc;\r
 286                         }\r
 287                         }\r
 288                 }\r
 289                 return NullPermConverter.singleton();\r
 290         }\r
 291         \r
 292         /**\r
 293          * store PermConverters by Path prefix\r
 294          *\r
 295          */\r
 296         private class Pair {\r
 297                 public Pair(String key, PermConverter pc) {\r
 298                         name = key;\r
 299                         this.pc = pc;\r
 300                 }\r
 301                 public String name;\r
 302                 public PermConverter pc;\r
 303         }\r
 304 \r
 305 }\r
 306 \r