src/org/cacert/gigi/email/EmailProvider.java

   1 package org.cacert.gigi.email;
   2
   3 import java.io.BufferedReader;
   4 import java.io.IOException;
   5 import java.io.InputStreamReader;
   6 import java.io.OutputStreamWriter;
   7 import java.io.PrintWriter;
   8 import java.net.Socket;
   9 import java.security.GeneralSecurityException;
  10 import java.security.Key;
  11 import java.security.PrivateKey;
  12 import java.security.cert.Certificate;
  13 import java.security.cert.X509Certificate;
  14 import java.util.Arrays;
  15 import java.util.Comparator;
  16 import java.util.Properties;
  17 import java.util.regex.Pattern;
  18
  19 import javax.naming.NamingException;
  20 import javax.net.ssl.SSLSocketFactory;
  21
  22 import org.cacert.gigi.crypto.SMIME;
  23 import org.cacert.gigi.database.GigiPreparedStatement;
  24 import org.cacert.gigi.util.DNSUtil;
  25
  26 public abstract class EmailProvider {
  27
  28     public abstract void sendmail(String to, String subject, String message, String from, String replyto, String toname, String fromname, String errorsto, boolean extra) throws IOException;
  29
  30     private static EmailProvider instance;
  31
  32     private X509Certificate c;
  33
  34     private PrivateKey k;
  35
  36     protected void init(Certificate c, Key k) {
  37         this.c = (X509Certificate) c;
  38         this.k = (PrivateKey) k;
  39     }
  40
  41     protected final void sendSigned(String contents, PrintWriter output) throws IOException, GeneralSecurityException {
  42         if (k == null || c == null) {
  43             output.println("Content-Transfer-Encoding: base64");
  44             output.println();
  45             output.print(contents);
  46         } else {
  47             SMIME.smime(contents, k, c, output);
  48         }
  49     }
  50
  51     public static EmailProvider getInstance() {
  52         return instance;
  53     }
  54
  55     protected static void setInstance(EmailProvider instance) {
  56         EmailProvider.instance = instance;
  57     }
  58
  59     public static void initSystem(Properties conf, Certificate cert, Key pk) {
  60         try {
  61             Class<?> c = Class.forName(conf.getProperty("emailProvider"));
  62             EmailProvider ep = (EmailProvider) c.getDeclaredConstructor(Properties.class).newInstance(conf);
  63             ep.init(cert, pk);
  64             instance = ep;
  65         } catch (ReflectiveOperationException e) {
  66             e.printStackTrace();
  67         }
  68     }
  69
  70     public static final String OK = "OK";
  71
  72     public static final String FAIL = "FAIL";
  73
  74     public static final Pattern MAIL = Pattern.compile("^([a-zA-Z0-9])+([a-zA-Z0-9\\+\\._-])*@([a-zA-Z0-9_-])+([a-zA-Z0-9\\._-]+)+$");
  75
  76     public String checkEmailServer(int forUid, String address) throws IOException {
  77         if (MAIL.matcher(address).matches()) {
  78             String[] parts = address.split("@", 2);
  79             String domain = parts[1];
  80
  81             String[] mxhosts;
  82             try {
  83                 mxhosts = DNSUtil.getMXEntries(domain);
  84             } catch (NamingException e1) {
  85                 return "MX lookup for your hostname failed.";
  86             }
  87             sortMX(mxhosts);
  88
  89             for (String host : mxhosts) {
  90                 host = host.split(" ", 2)[1];
  91                 if (host.endsWith(".")) {
  92                     host = host.substring(0, host.length() - 1);
  93                 } else {
  94                     return "Strange MX records.";
  95                 }
  96                 try (Socket s = new Socket(host, 25); BufferedReader br0 = new BufferedReader(new InputStreamReader(s.getInputStream(), "UTF-8"));//
  97                         PrintWriter pw0 = new PrintWriter(new OutputStreamWriter(s.getOutputStream(), "UTF-8"))) {
  98                     BufferedReader br = br0;
  99                     PrintWriter pw = pw0;
 100                     String line;
 101                     if ( !Sendmail.readSMTPResponse(br, 220)) {
 102                         continue;
 103                     }
 104
 105                     pw.print("EHLO www.cacert.org\r\n");
 106                     pw.flush();
 107                     boolean starttls = false;
 108                     do {
 109                         line = br.readLine();
 110                         if (line == null) {
 111                             break;
 112                         }
 113                         starttls |= line.substring(4).equals("STARTTLS");
 114                     } while (line.startsWith("250-"));
 115                     if (line == null || !line.startsWith("250 ")) {
 116                         continue;
 117                     }
 118
 119                     if (starttls) {
 120                         pw.print("STARTTLS\r\n");
 121                         pw.flush();
 122                         if ( !Sendmail.readSMTPResponse(br, 220)) {
 123                             continue;
 124                         }
 125                         Socket s1 = ((SSLSocketFactory) SSLSocketFactory.getDefault()).createSocket(s, host, 25, true);
 126                         br = new BufferedReader(new InputStreamReader(s1.getInputStream(), "UTF-8"));
 127                         pw = new PrintWriter(new OutputStreamWriter(s1.getOutputStream(), "UTF-8"));
 128                         pw.print("EHLO www.cacert.org\r\n");
 129                         pw.flush();
 130                         if ( !Sendmail.readSMTPResponse(br, 250)) {
 131                             continue;
 132                         }
 133                     }
 134
 135                     pw.print("MAIL FROM: <returns@cacert.org>\r\n");
 136                     pw.flush();
 137
 138                     if ( !Sendmail.readSMTPResponse(br, 250)) {
 139                         continue;
 140                     }
 141                     pw.print("RCPT TO: <" + address + ">\r\n");
 142                     pw.flush();
 143
 144                     if ( !Sendmail.readSMTPResponse(br, 250)) {
 145                         continue;
 146                     }
 147                     pw.print("QUIT\r\n");
 148                     pw.flush();
 149                     if ( !Sendmail.readSMTPResponse(br, 221)) {
 150                         continue;
 151                     }
 152
 153                     try (GigiPreparedStatement statmt = new GigiPreparedStatement("INSERT INTO `emailPinglog` SET `when`=NOW(), `email`=?, `result`=?, `uid`=?, `type`='fast', `status`=?::`pingState`")) {
 154                         statmt.setString(1, address);
 155                         statmt.setString(2, line);
 156                         statmt.setInt(3, forUid);
 157                         statmt.setString(4, "success");
 158                         statmt.execute();
 159                     }
 160
 161                     if (line == null || !line.startsWith("250")) {
 162                         return line;
 163                     } else {
 164                         return OK;
 165                     }
 166                 }
 167
 168             }
 169         }
 170         try (GigiPreparedStatement statmt = new GigiPreparedStatement("INSERT INTO `emailPinglog` SET `when`=NOW(), `email`=?, `result`=?, `uid`=?, `type`='fast', `status`=?::`pingState`")) {
 171             statmt.setString(1, address);
 172             statmt.setString(2, "Failed to make a connection to the mail server");
 173             statmt.setInt(3, forUid);
 174             statmt.setString(4, "failed");
 175             statmt.execute();
 176         }
 177         return FAIL;
 178     }
 179
 180     private static void sortMX(String[] mxhosts) {
 181         Arrays.sort(mxhosts, new Comparator<String>() {
 182
 183             @Override
 184             public int compare(String o1, String o2) {
 185                 int i1 = Integer.parseInt(o1.split(" ")[0]);
 186                 int i2 = Integer.parseInt(o2.split(" ")[0]);
 187                 return Integer.compare(i1, i2);
 188             }
 189         });
 190     }
 191
 192 }