View Javadoc

1   /*****************************************************************
2    * Licensed to the Apache Software Foundation (ASF) under one   *
3    * or more contributor license agreements.  See the NOTICE file *
4    * distributed with this work for additional information        *
5    * regarding copyright ownership.  The ASF licenses this file   *
6    * to you under the Apache License, Version 2.0 (the            *
7    * "License"); you may not use this file except in compliance   *
8    * with the License.  You may obtain a copy of the License at   *
9    *                                                              *
10   *   http://www.apache.org/licenses/LICENSE-2.0                 *
11   *                                                              *
12   * Unless required by applicable law or agreed to in writing,   *
13   * software distributed under the License is distributed on an  *
14   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY       *
15   * KIND, either express or implied.  See the License for the    *
16   * specific language governing permissions and limitations      *
17   * under the License.                                           *
18   ****************************************************************/
19  
20  package org.apache.james.transport.matchers;
21  
22  import org.apache.mailet.GenericMatcher;
23  import org.apache.mailet.Mail;
24  
25  import java.util.Collection;
26  
27  /***
28   * Does a DNS lookup (MX and A/CNAME records) on the sender's domain.  If
29   * there are no entries, the domain is considered fake and the match is 
30   * successful.
31   *
32   */
33  public class SenderInFakeDomain extends AbstractNetworkMatcher {
34  
35      public Collection match(Mail mail) {
36          if (mail.getSender() == null) {
37              return null;
38          }
39          String domain = mail.getSender().getHost();
40          //DNS Lookup for this domain
41          Collection servers = getMailetContext().getMailServers(domain);
42          if (servers.size() == 0) {
43              //No records...could not deliver to this domain, so matches criteria.
44              log("No MX, A, or CNAME record found for domain: " + domain);
45              return mail.getRecipients();
46          } else if (matchNetwork(servers.iterator().next().toString())){
47              /*
48               * It could be a wildcard address like these:
49               *
50               * 64.55.105.9/32          # Allegiance Telecom Companies Worldwide (.nu)
51               * 64.94.110.11/32         # VeriSign (.com .net)
52               * 194.205.62.122/32       # Network Information Center - Ascension Island (.ac)
53               * 194.205.62.62/32        # Internet Computer Bureau (.sh)
54               * 195.7.77.20/32          # Fredrik Reutersward Data (.museum)
55               * 206.253.214.102/32      # Internap Network Services (.cc)
56               * 212.181.91.6/32         # .NU Domain Ltd. (.nu)
57               * 219.88.106.80/32        # Telecom Online Solutions (.cx)
58               * 194.205.62.42/32        # Internet Computer Bureau (.tm)
59               * 216.35.187.246/32       # Cable & Wireless (.ws)
60               * 203.119.4.6/32          # .PH TLD (.ph)
61               *
62               */
63              log("Banned IP found for domain: " + domain);
64              log(" --> :" + servers.iterator().next().toString());
65              return mail.getRecipients();
66          } else {
67              // Some servers were found... the domain is not fake.
68  
69              return null;
70          }
71      }
72  }