Uso de Javamail y Greenmail para SMTPS/SSL

Question

Estoy tratando de escribir una prueba que use JavaMail SMTP o SMTPS para enviar un mensaje a través de SSL y la autenticación a un servidor Greenmail que estoy ejecutando.

He escrito un pequeño submarino rápida que debe hacer exactamente lo que estoy queriendo:

import java.util.Properties; 

import javax.mail.Session; 
import javax.mail.Transport; 

import com.icegreen.greenmail.user.GreenMailUser; 
import com.icegreen.greenmail.util.GreenMail; 

public class MailTest { 
    public static void main(String[] args) throws Exception { 
     GreenMail greenmail = new GreenMail(); 
     try { 
      greenmail.start(); 

      String email = "foo@bar"; 
      String userid = "user"; 
      String password = "pa$$word"; 
      GreenMailUser setUser = greenmail.setUser(email, userid, password); 
      setUser.create(); 
      GreenMailUser user = greenmail.getManagers().getUserManager().getUser(userid); 
      System.out.println("User created:" + user.getEmail() + ":" + user.getLogin() + ":" + user.getPassword()); 

      int portSmtps = greenmail.getSmtps().getPort(); 
      System.out.println("Smtps started on port:" + portSmtps); 

      Properties props = new Properties(); 
      props.put("mail.smtp.starttls.enable", "true"); 
      props.put("mail.smtp.auth", "true"); 
      props.put("mail.smtp.host", "localhost"); 
      props.put("mail.smtp.socketFactory.port", portSmtps); 
      props.put("mail.smtp.socketFactory.class", "javax.net.ssl.SSLSocketFactory"); 
      props.put("mail.smtp.socketFactory.fallback", "false"); 
      Session session = Session.getInstance(props); 
      Transport transport = session.getTransport("smtp"); 
      transport.connect("localhost", portSmtps, userid, password); 
      System.out.println("Transport is connected: " + transport.isConnected()); 
     } finally { 
      greenmail.stop(); 
     } 
    } 
} 

Mi problema es que tengo varias excepciones:

Exception in thread "Thread-7" java.lang.RuntimeException: javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown 
    at com.icegreen.greenmail.smtp.SmtpHandler.run(Unknown Source) 
Caused by: javax.net.ssl.SSLException: Connection has been shutdown: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.checkEOF(SSLSocketImpl.java:1293) 
    at com.sun.net.ssl.internal.ssl.AppInputStream.read(AppInputStream.java:65) 
    at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:264) 
    at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:306) 
    at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:158) 
    at java.io.InputStreamReader.read(InputStreamReader.java:167) 
    at java.io.BufferedReader.fill(BufferedReader.java:136) 
    at java.io.BufferedReader.readLine(BufferedReader.java:299) 
    at java.io.BufferedReader.readLine(BufferedReader.java:362) 
    at com.icegreen.greenmail.smtp.SmtpConnection.readLine(Unknown Source) 
    at com.icegreen.greenmail.smtp.SmtpHandler.handleCommand(Unknown Source) 
    ... 1 more 
Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: certificate_unknown 
    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174) 
    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:136) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.recvAlert(SSLSocketImpl.java:1720) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:954) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1138) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.writeRecord(SSLSocketImpl.java:632) 
    at com.sun.net.ssl.internal.ssl.AppOutputStream.write(AppOutputStream.java:59) 
    at sun.nio.cs.StreamEncoder.writeBytes(StreamEncoder.java:202) 
    at sun.nio.cs.StreamEncoder.implFlushBuffer(StreamEncoder.java:272) 
    at sun.nio.cs.StreamEncoder.implFlush(StreamEncoder.java:276) 
    at sun.nio.cs.StreamEncoder.flush(StreamEncoder.java:122) 
    at java.io.OutputStreamWriter.flush(OutputStreamWriter.java:212) 
    at java.io.BufferedWriter.flush(BufferedWriter.java:236) 
    at java.io.PrintWriter.flush(PrintWriter.java:276) 
    at com.icegreen.greenmail.util.InternetPrintWriter.println(Unknown Source) 
    at com.icegreen.greenmail.util.InternetPrintWriter.println(Unknown Source) 
    at com.icegreen.greenmail.smtp.SmtpConnection.println(Unknown Source) 
    at com.icegreen.greenmail.smtp.SmtpHandler.sendGreetings(Unknown Source) 
    ... 1 more 
Exception in thread "main" javax.mail.MessagingException: Could not connect to SMTP host: localhost, port: 3465; 
    nested exception is: 
    javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1934) 
    at com.sun.mail.smtp.SMTPTransport.protocolConnect(SMTPTransport.java:638) 
    at javax.mail.Service.connect(Service.java:295) 
    at MailTest.main(MailTest.java:35) 
Caused by: javax.net.ssl.SSLHandshakeException: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
    at com.sun.net.ssl.internal.ssl.Alerts.getSSLException(Alerts.java:174) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.fatal(SSLSocketImpl.java:1649) 
    at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:241) 
    at com.sun.net.ssl.internal.ssl.Handshaker.fatalSE(Handshaker.java:235) 
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1206) 
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.processMessage(ClientHandshaker.java:136) 
    at com.sun.net.ssl.internal.ssl.Handshaker.processLoop(Handshaker.java:593) 
    at com.sun.net.ssl.internal.ssl.Handshaker.process_record(Handshaker.java:529) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.readRecord(SSLSocketImpl.java:893) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.performInitialHandshake(SSLSocketImpl.java:1138) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1165) 
    at com.sun.net.ssl.internal.ssl.SSLSocketImpl.startHandshake(SSLSocketImpl.java:1149) 
    at com.sun.mail.util.SocketFetcher.configureSSLSocket(SocketFetcher.java:507) 
    at com.sun.mail.util.SocketFetcher.getSocket(SocketFetcher.java:238) 
    at com.sun.mail.smtp.SMTPTransport.openServer(SMTPTransport.java:1900) 
    ... 3 more 
Caused by: sun.security.validator.ValidatorException: PKIX path building failed: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
    at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:323) 
    at sun.security.validator.PKIXValidator.engineValidate(PKIXValidator.java:217) 
    at sun.security.validator.Validator.validate(Validator.java:218) 
    at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.validate(X509TrustManagerImpl.java:126) 
    at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:209) 
    at com.sun.net.ssl.internal.ssl.X509TrustManagerImpl.checkServerTrusted(X509TrustManagerImpl.java:249) 
    at com.sun.net.ssl.internal.ssl.ClientHandshaker.serverCertificate(ClientHandshaker.java:1185) 
    ... 13 more 
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target 
    at sun.security.provider.certpath.SunCertPathBuilder.engineBuild(SunCertPathBuilder.java:174) 
    at java.security.cert.CertPathBuilder.build(CertPathBuilder.java:238) 
    at sun.security.validator.PKIXValidator.doBuild(PKIXValidator.java:318) 
    ... 19 more 

He intentado buscar en algunas otras respuestas aquí, pero debo estar perdiendo algo:

• JavaMail to send secure email through vps - SSLHandshake Exception, PKIX path building failed, etc. - Can't send mail
• PKIX path building failed: unable to find valid certification path to requested target
• Using JavaMail with TLS

Lo siento por el puesto de largo y gracias de antemano por cualquier consejo.

Answer 1

Usted debe comenzar su servidor greenmail así:

Security.setProperty("ssl.SocketFactory.provider", DummySSLSocketFactory.class.getName()); 
GreenMail mailServer = new GreenMail(ServerSetupTest.SMTPS); 
mailServer.start(); 

Answer 2

El certificado SSL utilizado en el servidor de Greenmail debe estar firmado por una autoridad certificadora "conocida", O debe agregar el certificado CA que se utilizó para firmar el certificado en el almacén de claves de Java. No hay forma de decirle a Java que no valide la cadena de certificados hasta una CA conocida.