CODEWITHSUNDEEP
javassl
SoftChili
SoftChili

Reputation: 93

Which values are possible for the javaMail SMTP session property mail.smtp.ssl.protocols?

I am searching for nearly an hour so far to find a specification or list for valid values to fill this property.

I am using the javax.mail.Session and invoke the Session.getInstance(props) to set "mail.smtp.ssl.protocols".

I have an example in the code, i am working on: "TLSv1". I want to know, if there are more versions for TLS available or if i can leave the version out and just set it to "TLS" instead.

The hints and links i followed on the web, were not concrete enough or were dead links.

Where I searched yet so far:

Many links to Oracle documentation only show the Oracle landing page. Wikipedia description for SMTP mentions the RFC 821, but it does not contain a list of properties or a link to them.

Thank you for help.

Upvotes: 1

Views: 11188

Answers (1)

sinclair
sinclair

Reputation: 2861

SSLSocket provides a method getSupportedProtocols():

SSLSocketFactory sf = new SSLSocketFactoryImpl(); SSLSocket s = (SSLSocket) sf.createSocket(); System.out.println( Arrays.toString( s.getSupportedProtocols() )) ;

Output: [SSLv2Hello, SSLv3, TLSv1, TLSv1.1, TLSv1.2]

http://download.java.net/jdk7/archive/b123/docs/api/javax/net/ssl/SSLSocket.html#getSupportedProtocols%28%29

Details:

https://javamail.java.net/nonav/docs/api/com/sun/mail/smtp/package-summary.html

mail.smtp.ssl.protocols - Specifies the SSL protocols that will be enabled for SSL connections. The property value is a whitespace separated list of tokens acceptable to the javax.net.ssl.SSLSocket.setEnabledProtocols method.

https://docs.oracle.com/javase/7/docs/api/javax/net/ssl/SSLSocket.html#setEnabledProtocols%28java.lang.String[]%29

The protocols must have been listed by getSupportedProtocols() as being supported.

Upvotes: 8

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