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https://issues.apache.org/jira/browse/FTPSERVER-97?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12504543
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Steve Jones commented on FTPSERVER-97:
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The approach used by Tomcat is to allow users to enable a subset of the default
cipher suites.
Here's where the set of cipher suites to enable is calculated (see
getEnabledCiphers):
http://svn.apache.org/viewvc/tomcat/connectors/trunk/util/java/org/apache/tomcat/util/net/jsse/JSSESocketFactory.java?view=markup
Here's the changeset where they switched from allowing selection from all
available cipher suites to just from those enabled by default:
http://svn.apache.org/viewvc?view=rev&revision=385160
I don't know of any way to deactivate cipher suites that only support
authentication but there's a comprehensive list here (Appendix B) to choose
from ....
http://java.sun.com/j2se/1.5.0/docs/guide/security/jsse/JSSERefGuide.html#SunJSSE
If you use this (blacklist) approach, I would recommend avoiding any anonymous
cipher suites also (due to the possibility of man-in-the-middle attacks)
> SSL data connection enables all supported ciphers
> -------------------------------------------------
>
> Key: FTPSERVER-97
> URL: https://issues.apache.org/jira/browse/FTPSERVER-97
> Project: FtpServer
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.0-M1
> Reporter: Steve Jones
>
> The SSL implementation that is used by default for FTP data transfers
> (DefaultSsl) enables all SSL cipher suites:
> String cipherSuites[] = serverSocket.getSupportedCipherSuites();
> serverSocket.setEnabledCipherSuites(cipherSuites);
> This is likely to enable ciphers such as:
> SSL_RSA_WITH_NULL_MD5
> SSL_RSA_WITH_NULL_SHA
> Which means that there is no confidentiality for the transport (in other
> words authentication will occur but after that communication is in the
> clear).
> Usually you would not want to allow this, so it is best not to enable all
> ciphers.
> Here's a reference to this issue for another apache project:
> http://mail-archives.apache.org/mod_mbox/avalon-apps-dev/200209.mbox/[EMAIL
> PROTECTED]
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