package org.cacert.gigi.email;
+import java.io.BufferedReader;
import java.io.IOException;
+import java.io.InputStreamReader;
+import java.io.OutputStreamWriter;
+import java.io.PrintWriter;
+import java.net.Socket;
+import java.security.GeneralSecurityException;
+import java.security.Key;
+import java.security.PrivateKey;
+import java.security.cert.Certificate;
+import java.security.cert.X509Certificate;
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.Properties;
+import java.util.regex.Pattern;
+
+import javax.naming.NamingException;
+import javax.net.ssl.SSLSocketFactory;
+
+import org.cacert.gigi.crypto.SMIME;
+import org.cacert.gigi.database.GigiPreparedStatement;
+import org.cacert.gigi.util.DNSUtil;
+import org.cacert.gigi.util.DomainAssessment;
public abstract class EmailProvider {
- public abstract void sendmail(String to, String subject, String message,
- String from, String replyto, String toname, String fromname,
- String errorsto, boolean extra) throws IOException;
- private static EmailProvider instance;
- public static EmailProvider getInstance() {
- return instance;
- }
+
+ public abstract void sendMail(String to, String subject, String message, String replyto, String toname, String fromname, String errorsto, boolean extra) throws IOException;
+
+ private static EmailProvider instance;
+
+ private X509Certificate c;
+
+ private PrivateKey k;
+
+ protected void init(Certificate c, Key k) {
+ this.c = (X509Certificate) c;
+ this.k = (PrivateKey) k;
+ }
+
+ protected final void sendSigned(String contents, PrintWriter output) throws IOException, GeneralSecurityException {
+ if (k == null || c == null) {
+ output.println("Content-Transfer-Encoding: base64");
+ output.println();
+ output.print(contents);
+ } else {
+ SMIME.smime(contents, k, c, output);
+ }
+ }
+
+ public static EmailProvider getInstance() {
+ return instance;
+ }
+
+ protected static void setInstance(EmailProvider instance) {
+ EmailProvider.instance = instance;
+ }
+
+ public static void initSystem(Properties conf, Certificate cert, Key pk) {
+ try {
+ Class<?> c = Class.forName(conf.getProperty("emailProvider"));
+ EmailProvider ep = (EmailProvider) c.getDeclaredConstructor(Properties.class).newInstance(conf);
+ ep.init(cert, pk);
+ instance = ep;
+ } catch (ReflectiveOperationException e) {
+ e.printStackTrace();
+ }
+ }
+
+ public static final String OK = "OK";
+
+ public static final String FAIL = "FAIL";
+
+ private static final String MAIL_P_RFC_WORD = "[A-Za-z0-9\\+\\.!#$%&'*/=?^_`|~{}-]+";
+
+ private static final String MAIL_P_RFC_LOCAL = MAIL_P_RFC_WORD + "(?:\\." + MAIL_P_RFC_WORD + ")*";
+
+ private static final String MAIL_P_RFC_LABEL = "(?!(?!xn)..--|-)(?:[A-Za-z0-9-]+)(?<!-)";
+
+ private static final String MAIL_P_RFC_ADDRESS = MAIL_P_RFC_LOCAL + "@(?:" + MAIL_P_RFC_LABEL + "\\.)+" + MAIL_P_RFC_LABEL + "\\.?";
+
+ private static final Pattern MAIL_LOCAL = Pattern.compile("^" + MAIL_P_RFC_LOCAL + "$");
+
+ private static final Pattern MAIL_ADDRESS = Pattern.compile("^" + MAIL_P_RFC_ADDRESS + "$");
+
+ public String checkEmailServer(int forUid, String address) throws IOException {
+ if (isValidMailAddress(address)) {
+ String[] parts = address.split("@", 2);
+ String domain = parts[1];
+
+ String[] mxhosts;
+ try {
+ mxhosts = DNSUtil.getMXEntries(domain);
+ } catch (NamingException e1) {
+ return "MX lookup for your hostname failed.";
+ }
+ sortMX(mxhosts);
+
+ for (String host : mxhosts) {
+ host = host.split(" ", 2)[1];
+ if (host.endsWith(".")) {
+ host = host.substring(0, host.length() - 1);
+ } else {
+ return "Strange MX records.";
+ }
+ try (Socket s = new Socket(host, 25);
+ BufferedReader br0 = new BufferedReader(new InputStreamReader(s.getInputStream(), "UTF-8"));//
+ PrintWriter pw0 = new PrintWriter(new OutputStreamWriter(s.getOutputStream(), "UTF-8"))) {
+ BufferedReader br = br0;
+ PrintWriter pw = pw0;
+ String line;
+ if ( !SendMail.readSMTPResponse(br, 220)) {
+ continue;
+ }
+
+ pw.print("EHLO www.cacert.org\r\n");
+ pw.flush();
+ boolean starttls = false;
+ do {
+ line = br.readLine();
+ if (line == null) {
+ break;
+ }
+ starttls |= line.substring(4).equals("STARTTLS");
+ } while (line.startsWith("250-"));
+ if (line == null || !line.startsWith("250 ")) {
+ continue;
+ }
+
+ if (starttls) {
+ pw.print("STARTTLS\r\n");
+ pw.flush();
+ if ( !SendMail.readSMTPResponse(br, 220)) {
+ continue;
+ }
+ Socket s1 = ((SSLSocketFactory) SSLSocketFactory.getDefault()).createSocket(s, host, 25, true);
+ br = new BufferedReader(new InputStreamReader(s1.getInputStream(), "UTF-8"));
+ pw = new PrintWriter(new OutputStreamWriter(s1.getOutputStream(), "UTF-8"));
+ pw.print("EHLO www.cacert.org\r\n");
+ pw.flush();
+ if ( !SendMail.readSMTPResponse(br, 250)) {
+ continue;
+ }
+ }
+
+ pw.print("MAIL FROM: <returns@cacert.org>\r\n");
+ pw.flush();
+
+ if ( !SendMail.readSMTPResponse(br, 250)) {
+ continue;
+ }
+ pw.print("RCPT TO: <" + address + ">\r\n");
+ pw.flush();
+
+ if ( !SendMail.readSMTPResponse(br, 250)) {
+ continue;
+ }
+ pw.print("QUIT\r\n");
+ pw.flush();
+ if ( !SendMail.readSMTPResponse(br, 221)) {
+ continue;
+ }
+
+ try (GigiPreparedStatement statmt = new GigiPreparedStatement("INSERT INTO `emailPinglog` SET `when`=NOW(), `email`=?, `result`=?, `uid`=?, `type`='fast', `status`=?::`pingState`")) {
+ statmt.setString(1, address);
+ statmt.setString(2, line);
+ statmt.setInt(3, forUid);
+ statmt.setString(4, "success");
+ statmt.execute();
+ }
+
+ if (line == null || !line.startsWith("250")) {
+ return line;
+ } else {
+ return OK;
+ }
+ }
+
+ }
+ }
+ try (GigiPreparedStatement statmt = new GigiPreparedStatement("INSERT INTO `emailPinglog` SET `when`=NOW(), `email`=?, `result`=?, `uid`=?, `type`='fast', `status`=?::`pingState`")) {
+ statmt.setString(1, address);
+ statmt.setString(2, "Failed to make a connection to the mail server");
+ statmt.setInt(3, forUid);
+ statmt.setString(4, "failed");
+ statmt.execute();
+ }
+ return FAIL;
+ }
+
+ private static void sortMX(String[] mxhosts) {
+ Arrays.sort(mxhosts, new Comparator<String>() {
+
+ @Override
+ public int compare(String o1, String o2) {
+ int i1 = Integer.parseInt(o1.split(" ")[0]);
+ int i2 = Integer.parseInt(o2.split(" ")[0]);
+ return Integer.compare(i1, i2);
+ }
+ });
+ }
+
+ public static boolean isValidMailAddress(String address) {
+ if ( !MAIL_ADDRESS.matcher(address).matches()) {
+ return false;
+ }
+
+ String[] parts = address.split("@", 2);
+
+ String local = parts[0];
+ String domain = parts[1];
+
+ if ( !MAIL_LOCAL.matcher(local).matches()) {
+ return false;
+ }
+
+ for (String domainPart : domain.split("\\.", -1)) {
+ if ( !DomainAssessment.isValidDomainPart(domainPart)) {
+ return false;
+ }
+ }
+
+ return true;
+ }
+
}
projects / gigi.git / blobdiff